1 /* $FreeBSD$ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 */
8 #if defined(KERNEL) || defined(_KERNEL)
9 # undef KERNEL
10 # undef _KERNEL
11 # define KERNEL 1
12 # define _KERNEL 1
13 #endif
14 #include <sys/errno.h>
15 #include <sys/types.h>
16 #include <sys/param.h>
17 #include <sys/time.h>
18 #include <sys/file.h>
19 #if defined(_KERNEL) && \
20 (defined(__NetBSD_Version) && (__NetBSD_Version >= 399002000))
21 # include <sys/kauth.h>
22 #endif
23 #if !defined(_KERNEL)
24 # include <stdio.h>
25 # include <string.h>
26 # include <stdlib.h>
27 # define KERNEL
28 # ifdef _OpenBSD__
29 struct file;
30 # endif
31 # include <sys/uio.h>
32 # undef KERNEL
33 #endif
34 #if defined(_KERNEL) && defined(__FreeBSD__)
35 # include <sys/filio.h>
36 # include <sys/fcntl.h>
37 #else
38 # include <sys/ioctl.h>
39 #endif
40 # include <sys/fcntl.h>
41 # include <sys/protosw.h>
42 #include <sys/socket.h>
43 #if defined(_KERNEL)
44 # include <sys/systm.h>
45 # if !defined(__SVR4)
46 # include <sys/mbuf.h>
47 # endif
48 #endif
49 #if defined(__SVR4)
50 # include <sys/filio.h>
51 # include <sys/byteorder.h>
52 # ifdef KERNEL
53 # include <sys/dditypes.h>
54 # endif
55 # include <sys/stream.h>
56 # include <sys/kmem.h>
57 #endif
58 #if defined(__FreeBSD__)
59 # include <sys/queue.h>
60 #endif
61 #include <net/if.h>
62 #if defined(__FreeBSD__)
63 # include <net/if_var.h>
64 #endif
65 #ifdef sun
66 # include <net/af.h>
67 #endif
68 #include <netinet/in.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/ip.h>
71
72 #ifdef RFC1825
73 # include <vpn/md5.h>
74 # include <vpn/ipsec.h>
75 extern struct ifnet vpnif;
76 #endif
77
78 # include <netinet/ip_var.h>
79 #include <netinet/tcp.h>
80 #include <netinet/udp.h>
81 #include <netinet/ip_icmp.h>
82 #include "netinet/ip_compat.h"
83 #include <netinet/tcpip.h>
84 #include "netinet/ipl.h"
85 #include "netinet/ip_fil.h"
86 #include "netinet/ip_nat.h"
87 #include "netinet/ip_frag.h"
88 #include "netinet/ip_state.h"
89 #include "netinet/ip_proxy.h"
90 #include "netinet/ip_lookup.h"
91 #include "netinet/ip_dstlist.h"
92 #include "netinet/ip_sync.h"
93 #if defined(__FreeBSD__)
94 # include <sys/malloc.h>
95 #endif
96 #ifdef HAS_SYS_MD5_H
97 # include <sys/md5.h>
98 #else
99 # include "md5.h"
100 #endif
101 /* END OF INCLUDES */
102
103 #undef SOCKADDR_IN
104 #define SOCKADDR_IN struct sockaddr_in
105
106 #if !defined(lint)
107 static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed";
108 static const char rcsid[] = "@(#)$FreeBSD$";
109 /* static const char rcsid[] = "@(#)$Id: ip_nat.c,v 2.195.2.102 2007/10/16 10:08:10 darrenr Exp $"; */
110 #endif
111
112
113 #define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \
114 (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3])
115 #define NBUMP(x) softn->(x)++
116 #define NBUMPD(x, y) do { \
117 softn->x.y++; \
118 DT(y); \
119 } while (0)
120 #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++
121 #define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \
122 DT(x); } while (0)
123 #define NBUMPSIDEX(y,x,z) \
124 do { softn->ipf_nat_stats.ns_side[y].x++; \
125 DT(z); } while (0)
126 #define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \
127 DT1(x, fr_info_t *, fin); } while (0)
128
129 static ipftuneable_t ipf_nat_tuneables[] = {
130 /* nat */
131 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) },
132 "nat_lock", 0, 1,
133 stsizeof(ipf_nat_softc_t, ipf_nat_lock),
134 IPFT_RDONLY, NULL, NULL },
135 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) },
136 "nat_table_size", 1, 0x7fffffff,
137 stsizeof(ipf_nat_softc_t, ipf_nat_table_sz),
138 0, NULL, ipf_nat_rehash },
139 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) },
140 "nat_table_max", 1, 0x7fffffff,
141 stsizeof(ipf_nat_softc_t, ipf_nat_table_max),
142 0, NULL, NULL },
143 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) },
144 "nat_rules_size", 1, 0x7fffffff,
145 stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz),
146 0, NULL, ipf_nat_rehash_rules },
147 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) },
148 "rdr_rules_size", 1, 0x7fffffff,
149 stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz),
150 0, NULL, ipf_nat_rehash_rules },
151 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) },
152 "hostmap_size", 1, 0x7fffffff,
153 stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz),
154 0, NULL, ipf_nat_hostmap_rehash },
155 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) },
156 "nat_maxbucket",1, 0x7fffffff,
157 stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket),
158 0, NULL, NULL },
159 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) },
160 "nat_logging", 0, 1,
161 stsizeof(ipf_nat_softc_t, ipf_nat_logging),
162 0, NULL, NULL },
163 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) },
164 "nat_doflush", 0, 1,
165 stsizeof(ipf_nat_softc_t, ipf_nat_doflush),
166 0, NULL, NULL },
167 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) },
168 "nat_table_wm_low", 1, 99,
169 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low),
170 0, NULL, NULL },
171 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) },
172 "nat_table_wm_high", 2, 100,
173 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high),
174 0, NULL, NULL },
175 { { 0 },
176 NULL, 0, 0,
177 0,
178 0, NULL, NULL }
179 };
180
181 /* ======================================================================== */
182 /* How the NAT is organised and works. */
183 /* */
184 /* Inside (interface y) NAT Outside (interface x) */
185 /* -------------------- -+- ------------------------------------- */
186 /* Packet going | out, processsed by ipf_nat_checkout() for x */
187 /* ------------> | ------------> */
188 /* src=10.1.1.1 | src=192.1.1.1 */
189 /* | */
190 /* | in, processed by ipf_nat_checkin() for x */
191 /* <------------ | <------------ */
192 /* dst=10.1.1.1 | dst=192.1.1.1 */
193 /* -------------------- -+- ------------------------------------- */
194 /* ipf_nat_checkout() - changes ip_src and if required, sport */
195 /* - creates a new mapping, if required. */
196 /* ipf_nat_checkin() - changes ip_dst and if required, dport */
197 /* */
198 /* In the NAT table, internal source is recorded as "in" and externally */
199 /* seen as "out". */
200 /* ======================================================================== */
201
202
203 #if SOLARIS && !defined(INSTANCES)
204 extern int pfil_delayed_copy;
205 #endif
206
207 static int ipf_nat_flush_entry(ipf_main_softc_t *, void *);
208 static int ipf_nat_getent(ipf_main_softc_t *, caddr_t, int);
209 static int ipf_nat_getsz(ipf_main_softc_t *, caddr_t, int);
210 static int ipf_nat_putent(ipf_main_softc_t *, caddr_t, int);
211 static void ipf_nat_addmap(ipf_nat_softc_t *, ipnat_t *);
212 static void ipf_nat_addrdr(ipf_nat_softc_t *, ipnat_t *);
213 static int ipf_nat_builddivertmp(ipf_nat_softc_t *, ipnat_t *);
214 static int ipf_nat_clearlist(ipf_main_softc_t *, ipf_nat_softc_t *);
215 static int ipf_nat_cmp_rules(ipnat_t *, ipnat_t *);
216 static int ipf_nat_decap(fr_info_t *, nat_t *);
217 static void ipf_nat_delrule(ipf_main_softc_t *, ipf_nat_softc_t *,
218 ipnat_t *, int);
219 static int ipf_nat_extraflush(ipf_main_softc_t *, ipf_nat_softc_t *, int);
220 static int ipf_nat_finalise(fr_info_t *, nat_t *);
221 static int ipf_nat_flushtable(ipf_main_softc_t *, ipf_nat_softc_t *);
222 static int ipf_nat_getnext(ipf_main_softc_t *, ipftoken_t *,
223 ipfgeniter_t *, ipfobj_t *);
224 static int ipf_nat_gettable(ipf_main_softc_t *, ipf_nat_softc_t *,
225 char *);
226 static hostmap_t *ipf_nat_hostmap(ipf_nat_softc_t *, ipnat_t *,
227 struct in_addr, struct in_addr,
228 struct in_addr, u_32_t);
229 static int ipf_nat_icmpquerytype(int);
230 static int ipf_nat_iterator(ipf_main_softc_t *, ipftoken_t *,
231 ipfgeniter_t *, ipfobj_t *);
232 static int ipf_nat_match(fr_info_t *, ipnat_t *);
233 static int ipf_nat_matcharray(nat_t *, int *, u_long);
234 static int ipf_nat_matchflush(ipf_main_softc_t *, ipf_nat_softc_t *,
235 caddr_t);
236 static void ipf_nat_mssclamp(tcphdr_t *, u_32_t, fr_info_t *,
237 u_short *);
238 static int ipf_nat_newmap(fr_info_t *, nat_t *, natinfo_t *);
239 static int ipf_nat_newdivert(fr_info_t *, nat_t *, natinfo_t *);
240 static int ipf_nat_newrdr(fr_info_t *, nat_t *, natinfo_t *);
241 static int ipf_nat_newrewrite(fr_info_t *, nat_t *, natinfo_t *);
242 static int ipf_nat_nextaddr(fr_info_t *, nat_addr_t *, u_32_t *,
243 u_32_t *);
244 static int ipf_nat_nextaddrinit(ipf_main_softc_t *, char *,
245 nat_addr_t *, int, void *);
246 static int ipf_nat_resolverule(ipf_main_softc_t *, ipnat_t *);
247 static int ipf_nat_ruleaddrinit(ipf_main_softc_t *,
248 ipf_nat_softc_t *, ipnat_t *);
249 static void ipf_nat_rule_fini(ipf_main_softc_t *, ipnat_t *);
250 static int ipf_nat_rule_init(ipf_main_softc_t *, ipf_nat_softc_t *,
251 ipnat_t *);
252 static int ipf_nat_siocaddnat(ipf_main_softc_t *, ipf_nat_softc_t *,
253 ipnat_t *, int);
254 static void ipf_nat_siocdelnat(ipf_main_softc_t *, ipf_nat_softc_t *,
255 ipnat_t *, int);
256 static void ipf_nat_tabmove(ipf_nat_softc_t *, nat_t *);
257
258 /* ------------------------------------------------------------------------ */
259 /* Function: ipf_nat_main_load */
260 /* Returns: int - 0 == success, -1 == failure */
261 /* Parameters: Nil */
262 /* */
263 /* The only global NAT structure that needs to be initialised is the filter */
264 /* rule that is used with blocking packets. */
265 /* ------------------------------------------------------------------------ */
266 int
ipf_nat_main_load()267 ipf_nat_main_load()
268 {
269
270 return 0;
271 }
272
273
274 /* ------------------------------------------------------------------------ */
275 /* Function: ipf_nat_main_unload */
276 /* Returns: int - 0 == success, -1 == failure */
277 /* Parameters: Nil */
278 /* */
279 /* A null-op function that exists as a placeholder so that the flow in */
280 /* other functions is obvious. */
281 /* ------------------------------------------------------------------------ */
282 int
ipf_nat_main_unload()283 ipf_nat_main_unload()
284 {
285 return 0;
286 }
287
288
289 /* ------------------------------------------------------------------------ */
290 /* Function: ipf_nat_soft_create */
291 /* Returns: void * - NULL = failure, else pointer to NAT context */
292 /* Parameters: softc(I) - pointer to soft context main structure */
293 /* */
294 /* Allocate the initial soft context structure for NAT and populate it with */
295 /* some default values. Creating the tables is left until we call _init so */
296 /* that sizes can be changed before we get under way. */
297 /* ------------------------------------------------------------------------ */
298 void *
ipf_nat_soft_create(softc)299 ipf_nat_soft_create(softc)
300 ipf_main_softc_t *softc;
301 {
302 ipf_nat_softc_t *softn;
303
304 KMALLOC(softn, ipf_nat_softc_t *);
305 if (softn == NULL)
306 return NULL;
307
308 bzero((char *)softn, sizeof(*softn));
309
310 softn->ipf_nat_tune = ipf_tune_array_copy(softn,
311 sizeof(ipf_nat_tuneables),
312 ipf_nat_tuneables);
313 if (softn->ipf_nat_tune == NULL) {
314 ipf_nat_soft_destroy(softc, softn);
315 return NULL;
316 }
317 if (ipf_tune_array_link(softc, softn->ipf_nat_tune) == -1) {
318 ipf_nat_soft_destroy(softc, softn);
319 return NULL;
320 }
321
322 softn->ipf_nat_list_tail = &softn->ipf_nat_list;
323
324 softn->ipf_nat_table_max = NAT_TABLE_MAX;
325 softn->ipf_nat_table_sz = NAT_TABLE_SZ;
326 softn->ipf_nat_maprules_sz = NAT_SIZE;
327 softn->ipf_nat_rdrrules_sz = RDR_SIZE;
328 softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE;
329 softn->ipf_nat_doflush = 0;
330 #ifdef IPFILTER_LOG
331 softn->ipf_nat_logging = 1;
332 #else
333 softn->ipf_nat_logging = 0;
334 #endif
335
336 softn->ipf_nat_defage = DEF_NAT_AGE;
337 softn->ipf_nat_defipage = IPF_TTLVAL(60);
338 softn->ipf_nat_deficmpage = IPF_TTLVAL(3);
339 softn->ipf_nat_table_wm_high = 99;
340 softn->ipf_nat_table_wm_low = 90;
341
342 return softn;
343 }
344
345 /* ------------------------------------------------------------------------ */
346 /* Function: ipf_nat_soft_destroy */
347 /* Returns: Nil */
348 /* Parameters: softc(I) - pointer to soft context main structure */
349 /* */
350 /* ------------------------------------------------------------------------ */
351 void
ipf_nat_soft_destroy(softc,arg)352 ipf_nat_soft_destroy(softc, arg)
353 ipf_main_softc_t *softc;
354 void *arg;
355 {
356 ipf_nat_softc_t *softn = arg;
357
358 if (softn->ipf_nat_tune != NULL) {
359 ipf_tune_array_unlink(softc, softn->ipf_nat_tune);
360 KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables));
361 softn->ipf_nat_tune = NULL;
362 }
363
364 KFREE(softn);
365 }
366
367
368 /* ------------------------------------------------------------------------ */
369 /* Function: ipf_nat_init */
370 /* Returns: int - 0 == success, -1 == failure */
371 /* Parameters: softc(I) - pointer to soft context main structure */
372 /* */
373 /* Initialise all of the NAT locks, tables and other structures. */
374 /* ------------------------------------------------------------------------ */
375 int
ipf_nat_soft_init(softc,arg)376 ipf_nat_soft_init(softc, arg)
377 ipf_main_softc_t *softc;
378 void *arg;
379 {
380 ipf_nat_softc_t *softn = arg;
381 ipftq_t *tq;
382 int i;
383
384 KMALLOCS(softn->ipf_nat_table[0], nat_t **, \
385 sizeof(nat_t *) * softn->ipf_nat_table_sz);
386
387 if (softn->ipf_nat_table[0] != NULL) {
388 bzero((char *)softn->ipf_nat_table[0],
389 softn->ipf_nat_table_sz * sizeof(nat_t *));
390 } else {
391 return -1;
392 }
393
394 KMALLOCS(softn->ipf_nat_table[1], nat_t **, \
395 sizeof(nat_t *) * softn->ipf_nat_table_sz);
396
397 if (softn->ipf_nat_table[1] != NULL) {
398 bzero((char *)softn->ipf_nat_table[1],
399 softn->ipf_nat_table_sz * sizeof(nat_t *));
400 } else {
401 return -2;
402 }
403
404 KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \
405 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz);
406
407 if (softn->ipf_nat_map_rules != NULL) {
408 bzero((char *)softn->ipf_nat_map_rules,
409 softn->ipf_nat_maprules_sz * sizeof(ipnat_t *));
410 } else {
411 return -3;
412 }
413
414 KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \
415 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz);
416
417 if (softn->ipf_nat_rdr_rules != NULL) {
418 bzero((char *)softn->ipf_nat_rdr_rules,
419 softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *));
420 } else {
421 return -4;
422 }
423
424 KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \
425 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
426
427 if (softn->ipf_hm_maptable != NULL) {
428 bzero((char *)softn->ipf_hm_maptable,
429 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
430 } else {
431 return -5;
432 }
433 softn->ipf_hm_maplist = NULL;
434
435 KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *,
436 softn->ipf_nat_table_sz * sizeof(u_int));
437
438 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) {
439 return -6;
440 }
441 bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
442 softn->ipf_nat_table_sz * sizeof(u_int));
443
444 KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *,
445 softn->ipf_nat_table_sz * sizeof(u_int));
446
447 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) {
448 return -7;
449 }
450
451 bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
452 softn->ipf_nat_table_sz * sizeof(u_int));
453
454 if (softn->ipf_nat_maxbucket == 0) {
455 for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1)
456 softn->ipf_nat_maxbucket++;
457 softn->ipf_nat_maxbucket *= 2;
458 }
459
460 ipf_sttab_init(softc, softn->ipf_nat_tcptq);
461 /*
462 * Increase this because we may have "keep state" following this too
463 * and packet storms can occur if this is removed too quickly.
464 */
465 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack;
466 softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next =
467 &softn->ipf_nat_udptq;
468
469 IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage,
470 "nat ipftq udp tab");
471 softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq;
472
473 IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage,
474 "nat ipftq udpack tab");
475 softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq;
476
477 IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage,
478 "nat icmp ipftq tab");
479 softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq;
480
481 IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage,
482 "nat icmpack ipftq tab");
483 softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq;
484
485 IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage,
486 "nat ip ipftq tab");
487 softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending;
488
489 IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab");
490 softn->ipf_nat_pending.ifq_next = NULL;
491
492 for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) {
493 if (tq->ifq_ttl < softn->ipf_nat_deficmpage)
494 tq->ifq_ttl = softn->ipf_nat_deficmpage;
495 #ifdef LARGE_NAT
496 else if (tq->ifq_ttl > softn->ipf_nat_defage)
497 tq->ifq_ttl = softn->ipf_nat_defage;
498 #endif
499 }
500
501 /*
502 * Increase this because we may have "keep state" following
503 * this too and packet storms can occur if this is removed
504 * too quickly.
505 */
506 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack;
507
508 MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex");
509 MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex");
510
511 softn->ipf_nat_inited = 1;
512
513 return 0;
514 }
515
516
517 /* ------------------------------------------------------------------------ */
518 /* Function: ipf_nat_soft_fini */
519 /* Returns: Nil */
520 /* Parameters: softc(I) - pointer to soft context main structure */
521 /* */
522 /* Free all memory used by NAT structures allocated at runtime. */
523 /* ------------------------------------------------------------------------ */
524 int
ipf_nat_soft_fini(softc,arg)525 ipf_nat_soft_fini(softc, arg)
526 ipf_main_softc_t *softc;
527 void *arg;
528 {
529 ipf_nat_softc_t *softn = arg;
530 ipftq_t *ifq, *ifqnext;
531
532 (void) ipf_nat_clearlist(softc, softn);
533 (void) ipf_nat_flushtable(softc, softn);
534
535 /*
536 * Proxy timeout queues are not cleaned here because although they
537 * exist on the NAT list, ipf_proxy_unload is called after unload
538 * and the proxies actually are responsible for them being created.
539 * Should the proxy timeouts have their own list? There's no real
540 * justification as this is the only complication.
541 */
542 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) {
543 ifqnext = ifq->ifq_next;
544 if (ipf_deletetimeoutqueue(ifq) == 0)
545 ipf_freetimeoutqueue(softc, ifq);
546 }
547
548 if (softn->ipf_nat_table[0] != NULL) {
549 KFREES(softn->ipf_nat_table[0],
550 sizeof(nat_t *) * softn->ipf_nat_table_sz);
551 softn->ipf_nat_table[0] = NULL;
552 }
553 if (softn->ipf_nat_table[1] != NULL) {
554 KFREES(softn->ipf_nat_table[1],
555 sizeof(nat_t *) * softn->ipf_nat_table_sz);
556 softn->ipf_nat_table[1] = NULL;
557 }
558 if (softn->ipf_nat_map_rules != NULL) {
559 KFREES(softn->ipf_nat_map_rules,
560 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz);
561 softn->ipf_nat_map_rules = NULL;
562 }
563 if (softn->ipf_nat_rdr_rules != NULL) {
564 KFREES(softn->ipf_nat_rdr_rules,
565 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz);
566 softn->ipf_nat_rdr_rules = NULL;
567 }
568 if (softn->ipf_hm_maptable != NULL) {
569 KFREES(softn->ipf_hm_maptable,
570 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz);
571 softn->ipf_hm_maptable = NULL;
572 }
573 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) {
574 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
575 sizeof(u_int) * softn->ipf_nat_table_sz);
576 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL;
577 }
578 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) {
579 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
580 sizeof(u_int) * softn->ipf_nat_table_sz);
581 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL;
582 }
583
584 if (softn->ipf_nat_inited == 1) {
585 softn->ipf_nat_inited = 0;
586 ipf_sttab_destroy(softn->ipf_nat_tcptq);
587
588 MUTEX_DESTROY(&softn->ipf_nat_new);
589 MUTEX_DESTROY(&softn->ipf_nat_io);
590
591 MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock);
592 MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock);
593 MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock);
594 MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock);
595 MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock);
596 MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock);
597 }
598
599 return 0;
600 }
601
602
603 /* ------------------------------------------------------------------------ */
604 /* Function: ipf_nat_setlock */
605 /* Returns: Nil */
606 /* Parameters: arg(I) - pointer to soft state information */
607 /* tmp(I) - new lock value */
608 /* */
609 /* Set the "lock status" of NAT to the value in tmp. */
610 /* ------------------------------------------------------------------------ */
611 void
ipf_nat_setlock(arg,tmp)612 ipf_nat_setlock(arg, tmp)
613 void *arg;
614 int tmp;
615 {
616 ipf_nat_softc_t *softn = arg;
617
618 softn->ipf_nat_lock = tmp;
619 }
620
621
622 /* ------------------------------------------------------------------------ */
623 /* Function: ipf_nat_addrdr */
624 /* Returns: Nil */
625 /* Parameters: n(I) - pointer to NAT rule to add */
626 /* */
627 /* Adds a redirect rule to the hash table of redirect rules and the list of */
628 /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */
629 /* use by redirect rules. */
630 /* ------------------------------------------------------------------------ */
631 static void
ipf_nat_addrdr(softn,n)632 ipf_nat_addrdr(softn, n)
633 ipf_nat_softc_t *softn;
634 ipnat_t *n;
635 {
636 ipnat_t **np;
637 u_32_t j;
638 u_int hv;
639 u_int rhv;
640 int k;
641
642 if (n->in_odstatype == FRI_NORMAL) {
643 k = count4bits(n->in_odstmsk);
644 ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask);
645 j = (n->in_odstaddr & n->in_odstmsk);
646 rhv = NAT_HASH_FN(j, 0, 0xffffffff);
647 } else {
648 ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask);
649 j = 0;
650 rhv = 0;
651 }
652 hv = rhv % softn->ipf_nat_rdrrules_sz;
653 np = softn->ipf_nat_rdr_rules + hv;
654 while (*np != NULL)
655 np = &(*np)->in_rnext;
656 n->in_rnext = NULL;
657 n->in_prnext = np;
658 n->in_hv[0] = hv;
659 n->in_use++;
660 *np = n;
661 }
662
663
664 /* ------------------------------------------------------------------------ */
665 /* Function: ipf_nat_addmap */
666 /* Returns: Nil */
667 /* Parameters: n(I) - pointer to NAT rule to add */
668 /* */
669 /* Adds a NAT map rule to the hash table of rules and the list of loaded */
670 /* NAT rules. Updates the bitmask indicating which netmasks are in use by */
671 /* redirect rules. */
672 /* ------------------------------------------------------------------------ */
673 static void
ipf_nat_addmap(softn,n)674 ipf_nat_addmap(softn, n)
675 ipf_nat_softc_t *softn;
676 ipnat_t *n;
677 {
678 ipnat_t **np;
679 u_32_t j;
680 u_int hv;
681 u_int rhv;
682 int k;
683
684 if (n->in_osrcatype == FRI_NORMAL) {
685 k = count4bits(n->in_osrcmsk);
686 ipf_inet_mask_add(k, &softn->ipf_nat_map_mask);
687 j = (n->in_osrcaddr & n->in_osrcmsk);
688 rhv = NAT_HASH_FN(j, 0, 0xffffffff);
689 } else {
690 ipf_inet_mask_add(0, &softn->ipf_nat_map_mask);
691 j = 0;
692 rhv = 0;
693 }
694 hv = rhv % softn->ipf_nat_maprules_sz;
695 np = softn->ipf_nat_map_rules + hv;
696 while (*np != NULL)
697 np = &(*np)->in_mnext;
698 n->in_mnext = NULL;
699 n->in_pmnext = np;
700 n->in_hv[1] = rhv;
701 n->in_use++;
702 *np = n;
703 }
704
705
706 /* ------------------------------------------------------------------------ */
707 /* Function: ipf_nat_delrdr */
708 /* Returns: Nil */
709 /* Parameters: n(I) - pointer to NAT rule to delete */
710 /* */
711 /* Removes a redirect rule from the hash table of redirect rules. */
712 /* ------------------------------------------------------------------------ */
713 void
ipf_nat_delrdr(softn,n)714 ipf_nat_delrdr(softn, n)
715 ipf_nat_softc_t *softn;
716 ipnat_t *n;
717 {
718 if (n->in_odstatype == FRI_NORMAL) {
719 int k = count4bits(n->in_odstmsk);
720 ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask);
721 } else {
722 ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask);
723 }
724 if (n->in_rnext)
725 n->in_rnext->in_prnext = n->in_prnext;
726 *n->in_prnext = n->in_rnext;
727 n->in_use--;
728 }
729
730
731 /* ------------------------------------------------------------------------ */
732 /* Function: ipf_nat_delmap */
733 /* Returns: Nil */
734 /* Parameters: n(I) - pointer to NAT rule to delete */
735 /* */
736 /* Removes a NAT map rule from the hash table of NAT map rules. */
737 /* ------------------------------------------------------------------------ */
738 void
ipf_nat_delmap(softn,n)739 ipf_nat_delmap(softn, n)
740 ipf_nat_softc_t *softn;
741 ipnat_t *n;
742 {
743 if (n->in_osrcatype == FRI_NORMAL) {
744 int k = count4bits(n->in_osrcmsk);
745 ipf_inet_mask_del(k, &softn->ipf_nat_map_mask);
746 } else {
747 ipf_inet_mask_del(0, &softn->ipf_nat_map_mask);
748 }
749 if (n->in_mnext != NULL)
750 n->in_mnext->in_pmnext = n->in_pmnext;
751 *n->in_pmnext = n->in_mnext;
752 n->in_use--;
753 }
754
755
756 /* ------------------------------------------------------------------------ */
757 /* Function: ipf_nat_hostmap */
758 /* Returns: struct hostmap* - NULL if no hostmap could be created, */
759 /* else a pointer to the hostmapping to use */
760 /* Parameters: np(I) - pointer to NAT rule */
761 /* real(I) - real IP address */
762 /* map(I) - mapped IP address */
763 /* port(I) - destination port number */
764 /* Write Locks: ipf_nat */
765 /* */
766 /* Check if an ip address has already been allocated for a given mapping */
767 /* that is not doing port based translation. If is not yet allocated, then */
768 /* create a new entry if a non-NULL NAT rule pointer has been supplied. */
769 /* ------------------------------------------------------------------------ */
770 static struct hostmap *
ipf_nat_hostmap(softn,np,src,dst,map,port)771 ipf_nat_hostmap(softn, np, src, dst, map, port)
772 ipf_nat_softc_t *softn;
773 ipnat_t *np;
774 struct in_addr src;
775 struct in_addr dst;
776 struct in_addr map;
777 u_32_t port;
778 {
779 hostmap_t *hm;
780 u_int hv, rhv;
781
782 hv = (src.s_addr ^ dst.s_addr);
783 hv += src.s_addr;
784 hv += dst.s_addr;
785 rhv = hv;
786 hv %= softn->ipf_nat_hostmap_sz;
787 for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext)
788 if ((hm->hm_osrcip.s_addr == src.s_addr) &&
789 (hm->hm_odstip.s_addr == dst.s_addr) &&
790 ((np == NULL) || (np == hm->hm_ipnat)) &&
791 ((port == 0) || (port == hm->hm_port))) {
792 softn->ipf_nat_stats.ns_hm_addref++;
793 hm->hm_ref++;
794 return hm;
795 }
796
797 if (np == NULL) {
798 softn->ipf_nat_stats.ns_hm_nullnp++;
799 return NULL;
800 }
801
802 KMALLOC(hm, hostmap_t *);
803 if (hm) {
804 hm->hm_next = softn->ipf_hm_maplist;
805 hm->hm_pnext = &softn->ipf_hm_maplist;
806 if (softn->ipf_hm_maplist != NULL)
807 softn->ipf_hm_maplist->hm_pnext = &hm->hm_next;
808 softn->ipf_hm_maplist = hm;
809 hm->hm_hnext = softn->ipf_hm_maptable[hv];
810 hm->hm_phnext = softn->ipf_hm_maptable + hv;
811 if (softn->ipf_hm_maptable[hv] != NULL)
812 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext;
813 softn->ipf_hm_maptable[hv] = hm;
814 hm->hm_ipnat = np;
815 np->in_use++;
816 hm->hm_osrcip = src;
817 hm->hm_odstip = dst;
818 hm->hm_nsrcip = map;
819 hm->hm_ndstip.s_addr = 0;
820 hm->hm_ref = 1;
821 hm->hm_port = port;
822 hm->hm_hv = rhv;
823 hm->hm_v = 4;
824 softn->ipf_nat_stats.ns_hm_new++;
825 } else {
826 softn->ipf_nat_stats.ns_hm_newfail++;
827 }
828 return hm;
829 }
830
831
832 /* ------------------------------------------------------------------------ */
833 /* Function: ipf_nat_hostmapdel */
834 /* Returns: Nil */
835 /* Parameters: hmp(I) - pointer to hostmap structure pointer */
836 /* Write Locks: ipf_nat */
837 /* */
838 /* Decrement the references to this hostmap structure by one. If this */
839 /* reaches zero then remove it and free it. */
840 /* ------------------------------------------------------------------------ */
841 void
ipf_nat_hostmapdel(softc,hmp)842 ipf_nat_hostmapdel(softc, hmp)
843 ipf_main_softc_t *softc;
844 struct hostmap **hmp;
845 {
846 struct hostmap *hm;
847
848 hm = *hmp;
849 *hmp = NULL;
850
851 hm->hm_ref--;
852 if (hm->hm_ref == 0) {
853 ipf_nat_rule_deref(softc, &hm->hm_ipnat);
854 if (hm->hm_hnext)
855 hm->hm_hnext->hm_phnext = hm->hm_phnext;
856 *hm->hm_phnext = hm->hm_hnext;
857 if (hm->hm_next)
858 hm->hm_next->hm_pnext = hm->hm_pnext;
859 *hm->hm_pnext = hm->hm_next;
860 KFREE(hm);
861 }
862 }
863
864
865 /* ------------------------------------------------------------------------ */
866 /* Function: ipf_fix_outcksum */
867 /* Returns: Nil */
868 /* Parameters: fin(I) - pointer to packet information */
869 /* sp(I) - location of 16bit checksum to update */
870 /* n((I) - amount to adjust checksum by */
871 /* */
872 /* Adjusts the 16bit checksum by "n" for packets going out. */
873 /* ------------------------------------------------------------------------ */
874 void
ipf_fix_outcksum(cksum,sp,n,partial)875 ipf_fix_outcksum(cksum, sp, n, partial)
876 int cksum;
877 u_short *sp;
878 u_32_t n, partial;
879 {
880 u_short sumshort;
881 u_32_t sum1;
882
883 if (n == 0)
884 return;
885
886 if (cksum == 4) {
887 *sp = 0;
888 return;
889 }
890 if (cksum == 2) {
891 sum1 = partial;
892 sum1 = (sum1 & 0xffff) + (sum1 >> 16);
893 *sp = htons(sum1);
894 return;
895 }
896 sum1 = (~ntohs(*sp)) & 0xffff;
897 sum1 += (n);
898 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
899 /* Again */
900 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
901 sumshort = ~(u_short)sum1;
902 *(sp) = htons(sumshort);
903 }
904
905
906 /* ------------------------------------------------------------------------ */
907 /* Function: ipf_fix_incksum */
908 /* Returns: Nil */
909 /* Parameters: fin(I) - pointer to packet information */
910 /* sp(I) - location of 16bit checksum to update */
911 /* n((I) - amount to adjust checksum by */
912 /* */
913 /* Adjusts the 16bit checksum by "n" for packets going in. */
914 /* ------------------------------------------------------------------------ */
915 void
ipf_fix_incksum(cksum,sp,n,partial)916 ipf_fix_incksum(cksum, sp, n, partial)
917 int cksum;
918 u_short *sp;
919 u_32_t n, partial;
920 {
921 u_short sumshort;
922 u_32_t sum1;
923
924 if (n == 0)
925 return;
926
927 if (cksum == 4) {
928 *sp = 0;
929 return;
930 }
931 if (cksum == 2) {
932 sum1 = partial;
933 sum1 = (sum1 & 0xffff) + (sum1 >> 16);
934 *sp = htons(sum1);
935 return;
936 }
937
938 sum1 = (~ntohs(*sp)) & 0xffff;
939 sum1 += ~(n) & 0xffff;
940 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
941 /* Again */
942 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
943 sumshort = ~(u_short)sum1;
944 *(sp) = htons(sumshort);
945 }
946
947
948 /* ------------------------------------------------------------------------ */
949 /* Function: ipf_fix_datacksum */
950 /* Returns: Nil */
951 /* Parameters: sp(I) - location of 16bit checksum to update */
952 /* n((I) - amount to adjust checksum by */
953 /* */
954 /* Fix_datacksum is used *only* for the adjustments of checksums in the */
955 /* data section of an IP packet. */
956 /* */
957 /* The only situation in which you need to do this is when NAT'ing an */
958 /* ICMP error message. Such a message, contains in its body the IP header */
959 /* of the original IP packet, that causes the error. */
960 /* */
961 /* You can't use fix_incksum or fix_outcksum in that case, because for the */
962 /* kernel the data section of the ICMP error is just data, and no special */
963 /* processing like hardware cksum or ntohs processing have been done by the */
964 /* kernel on the data section. */
965 /* ------------------------------------------------------------------------ */
966 void
ipf_fix_datacksum(sp,n)967 ipf_fix_datacksum(sp, n)
968 u_short *sp;
969 u_32_t n;
970 {
971 u_short sumshort;
972 u_32_t sum1;
973
974 if (n == 0)
975 return;
976
977 sum1 = (~ntohs(*sp)) & 0xffff;
978 sum1 += (n);
979 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
980 /* Again */
981 sum1 = (sum1 >> 16) + (sum1 & 0xffff);
982 sumshort = ~(u_short)sum1;
983 *(sp) = htons(sumshort);
984 }
985
986
987 /* ------------------------------------------------------------------------ */
988 /* Function: ipf_nat_ioctl */
989 /* Returns: int - 0 == success, != 0 == failure */
990 /* Parameters: softc(I) - pointer to soft context main structure */
991 /* data(I) - pointer to ioctl data */
992 /* cmd(I) - ioctl command integer */
993 /* mode(I) - file mode bits used with open */
994 /* uid(I) - uid of calling process */
995 /* ctx(I) - pointer used as key for finding context */
996 /* */
997 /* Processes an ioctl call made to operate on the IP Filter NAT device. */
998 /* ------------------------------------------------------------------------ */
999 int
ipf_nat_ioctl(softc,data,cmd,mode,uid,ctx)1000 ipf_nat_ioctl(softc, data, cmd, mode, uid, ctx)
1001 ipf_main_softc_t *softc;
1002 ioctlcmd_t cmd;
1003 caddr_t data;
1004 int mode, uid;
1005 void *ctx;
1006 {
1007 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1008 int error = 0, ret, arg, getlock;
1009 ipnat_t *nat, *nt, *n;
1010 ipnat_t natd;
1011 SPL_INT(s);
1012
1013 #if !SOLARIS && defined(_KERNEL)
1014 # if NETBSD_GE_REV(399002000)
1015 if ((mode & FWRITE) &&
1016 kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL,
1017 KAUTH_REQ_NETWORK_FIREWALL_FW,
1018 NULL, NULL, NULL))
1019 # else
1020 # if defined(__FreeBSD__)
1021 if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE))
1022 # else
1023 if ((securelevel >= 3) && (mode & FWRITE))
1024 # endif
1025 # endif
1026 {
1027 IPFERROR(60001);
1028 return EPERM;
1029 }
1030 #endif
1031
1032 getlock = (mode & NAT_LOCKHELD) ? 0 : 1;
1033
1034 n = NULL;
1035 nt = NULL;
1036 nat = NULL;
1037
1038 if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) ||
1039 (cmd == (ioctlcmd_t)SIOCPURGENAT)) {
1040 if (mode & NAT_SYSSPACE) {
1041 bcopy(data, (char *)&natd, sizeof(natd));
1042 nat = &natd;
1043 error = 0;
1044 } else {
1045 bzero(&natd, sizeof(natd));
1046 error = ipf_inobj(softc, data, NULL, &natd,
1047 IPFOBJ_IPNAT);
1048 if (error != 0)
1049 goto done;
1050
1051 if (natd.in_size < sizeof(ipnat_t)) {
1052 error = EINVAL;
1053 goto done;
1054 }
1055 KMALLOCS(nt, ipnat_t *, natd.in_size);
1056 if (nt == NULL) {
1057 IPFERROR(60070);
1058 error = ENOMEM;
1059 goto done;
1060 }
1061 bzero(nt, natd.in_size);
1062 error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT,
1063 natd.in_size);
1064 if (error)
1065 goto done;
1066 nat = nt;
1067 }
1068
1069 /*
1070 * For add/delete, look to see if the NAT entry is
1071 * already present
1072 */
1073 nat->in_flags &= IPN_USERFLAGS;
1074 if ((nat->in_redir & NAT_MAPBLK) == 0) {
1075 if (nat->in_osrcatype == FRI_NORMAL ||
1076 nat->in_osrcatype == FRI_NONE)
1077 nat->in_osrcaddr &= nat->in_osrcmsk;
1078 if (nat->in_odstatype == FRI_NORMAL ||
1079 nat->in_odstatype == FRI_NONE)
1080 nat->in_odstaddr &= nat->in_odstmsk;
1081 if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) {
1082 if (nat->in_nsrcatype == FRI_NORMAL)
1083 nat->in_nsrcaddr &= nat->in_nsrcmsk;
1084 if (nat->in_ndstatype == FRI_NORMAL)
1085 nat->in_ndstaddr &= nat->in_ndstmsk;
1086 }
1087 }
1088
1089 error = ipf_nat_rule_init(softc, softn, nat);
1090 if (error != 0)
1091 goto done;
1092
1093 MUTEX_ENTER(&softn->ipf_nat_io);
1094 for (n = softn->ipf_nat_list; n != NULL; n = n->in_next)
1095 if (ipf_nat_cmp_rules(nat, n) == 0)
1096 break;
1097 }
1098
1099 switch (cmd)
1100 {
1101 #ifdef IPFILTER_LOG
1102 case SIOCIPFFB :
1103 {
1104 int tmp;
1105
1106 if (!(mode & FWRITE)) {
1107 IPFERROR(60002);
1108 error = EPERM;
1109 } else {
1110 tmp = ipf_log_clear(softc, IPL_LOGNAT);
1111 error = BCOPYOUT(&tmp, data, sizeof(tmp));
1112 if (error != 0) {
1113 IPFERROR(60057);
1114 error = EFAULT;
1115 }
1116 }
1117 break;
1118 }
1119
1120 case SIOCSETLG :
1121 if (!(mode & FWRITE)) {
1122 IPFERROR(60003);
1123 error = EPERM;
1124 } else {
1125 error = BCOPYIN(data, &softn->ipf_nat_logging,
1126 sizeof(softn->ipf_nat_logging));
1127 if (error != 0)
1128 error = EFAULT;
1129 }
1130 break;
1131
1132 case SIOCGETLG :
1133 error = BCOPYOUT(&softn->ipf_nat_logging, data,
1134 sizeof(softn->ipf_nat_logging));
1135 if (error != 0) {
1136 IPFERROR(60004);
1137 error = EFAULT;
1138 }
1139 break;
1140
1141 case FIONREAD :
1142 arg = ipf_log_bytesused(softc, IPL_LOGNAT);
1143 error = BCOPYOUT(&arg, data, sizeof(arg));
1144 if (error != 0) {
1145 IPFERROR(60005);
1146 error = EFAULT;
1147 }
1148 break;
1149 #endif
1150 case SIOCADNAT :
1151 if (!(mode & FWRITE)) {
1152 IPFERROR(60006);
1153 error = EPERM;
1154 } else if (n != NULL) {
1155 natd.in_flineno = n->in_flineno;
1156 (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT);
1157 IPFERROR(60007);
1158 error = EEXIST;
1159 } else if (nt == NULL) {
1160 IPFERROR(60008);
1161 error = ENOMEM;
1162 }
1163 if (error != 0) {
1164 MUTEX_EXIT(&softn->ipf_nat_io);
1165 break;
1166 }
1167 if (nat != nt)
1168 bcopy((char *)nat, (char *)nt, sizeof(*n));
1169 error = ipf_nat_siocaddnat(softc, softn, nt, getlock);
1170 MUTEX_EXIT(&softn->ipf_nat_io);
1171 if (error == 0) {
1172 nat = NULL;
1173 nt = NULL;
1174 }
1175 break;
1176
1177 case SIOCRMNAT :
1178 case SIOCPURGENAT :
1179 if (!(mode & FWRITE)) {
1180 IPFERROR(60009);
1181 error = EPERM;
1182 n = NULL;
1183 } else if (n == NULL) {
1184 IPFERROR(60010);
1185 error = ESRCH;
1186 }
1187
1188 if (error != 0) {
1189 MUTEX_EXIT(&softn->ipf_nat_io);
1190 break;
1191 }
1192 if (cmd == (ioctlcmd_t)SIOCPURGENAT) {
1193 error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT,
1194 n->in_size);
1195 if (error) {
1196 MUTEX_EXIT(&softn->ipf_nat_io);
1197 goto done;
1198 }
1199 n->in_flags |= IPN_PURGE;
1200 }
1201 ipf_nat_siocdelnat(softc, softn, n, getlock);
1202
1203 MUTEX_EXIT(&softn->ipf_nat_io);
1204 n = NULL;
1205 break;
1206
1207 case SIOCGNATS :
1208 {
1209 natstat_t *nsp = &softn->ipf_nat_stats;
1210
1211 nsp->ns_side[0].ns_table = softn->ipf_nat_table[0];
1212 nsp->ns_side[1].ns_table = softn->ipf_nat_table[1];
1213 nsp->ns_list = softn->ipf_nat_list;
1214 nsp->ns_maptable = softn->ipf_hm_maptable;
1215 nsp->ns_maplist = softn->ipf_hm_maplist;
1216 nsp->ns_nattab_sz = softn->ipf_nat_table_sz;
1217 nsp->ns_nattab_max = softn->ipf_nat_table_max;
1218 nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz;
1219 nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz;
1220 nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz;
1221 nsp->ns_instances = softn->ipf_nat_instances;
1222 nsp->ns_ticks = softc->ipf_ticks;
1223 #ifdef IPFILTER_LOGGING
1224 nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT);
1225 nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT);
1226 #else
1227 nsp->ns_log_ok = 0;
1228 nsp->ns_log_fail = 0;
1229 #endif
1230 error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT);
1231 break;
1232 }
1233
1234 case SIOCGNATL :
1235 {
1236 natlookup_t nl;
1237
1238 error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP);
1239 if (error == 0) {
1240 void *ptr;
1241
1242 if (getlock) {
1243 READ_ENTER(&softc->ipf_nat);
1244 }
1245
1246 switch (nl.nl_v)
1247 {
1248 case 4 :
1249 ptr = ipf_nat_lookupredir(&nl);
1250 break;
1251 #ifdef USE_INET6
1252 case 6 :
1253 ptr = ipf_nat6_lookupredir(&nl);
1254 break;
1255 #endif
1256 default:
1257 ptr = NULL;
1258 break;
1259 }
1260
1261 if (getlock) {
1262 RWLOCK_EXIT(&softc->ipf_nat);
1263 }
1264 if (ptr != NULL) {
1265 error = ipf_outobj(softc, data, &nl,
1266 IPFOBJ_NATLOOKUP);
1267 } else {
1268 IPFERROR(60011);
1269 error = ESRCH;
1270 }
1271 }
1272 break;
1273 }
1274
1275 case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */
1276 if (!(mode & FWRITE)) {
1277 IPFERROR(60012);
1278 error = EPERM;
1279 break;
1280 }
1281 if (getlock) {
1282 WRITE_ENTER(&softc->ipf_nat);
1283 }
1284
1285 error = BCOPYIN(data, &arg, sizeof(arg));
1286 if (error != 0) {
1287 IPFERROR(60013);
1288 error = EFAULT;
1289 } else {
1290 if (arg == 0)
1291 ret = ipf_nat_flushtable(softc, softn);
1292 else if (arg == 1)
1293 ret = ipf_nat_clearlist(softc, softn);
1294 else
1295 ret = ipf_nat_extraflush(softc, softn, arg);
1296 ipf_proxy_flush(softc->ipf_proxy_soft, arg);
1297 }
1298
1299 if (getlock) {
1300 RWLOCK_EXIT(&softc->ipf_nat);
1301 }
1302 if (error == 0) {
1303 error = BCOPYOUT(&ret, data, sizeof(ret));
1304 }
1305 break;
1306
1307 case SIOCMATCHFLUSH :
1308 if (!(mode & FWRITE)) {
1309 IPFERROR(60014);
1310 error = EPERM;
1311 break;
1312 }
1313 if (getlock) {
1314 WRITE_ENTER(&softc->ipf_nat);
1315 }
1316
1317 error = ipf_nat_matchflush(softc, softn, data);
1318
1319 if (getlock) {
1320 RWLOCK_EXIT(&softc->ipf_nat);
1321 }
1322 break;
1323
1324 case SIOCPROXY :
1325 error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx);
1326 break;
1327
1328 case SIOCSTLCK :
1329 if (!(mode & FWRITE)) {
1330 IPFERROR(60015);
1331 error = EPERM;
1332 } else {
1333 error = ipf_lock(data, &softn->ipf_nat_lock);
1334 }
1335 break;
1336
1337 case SIOCSTPUT :
1338 if ((mode & FWRITE) != 0) {
1339 error = ipf_nat_putent(softc, data, getlock);
1340 } else {
1341 IPFERROR(60016);
1342 error = EACCES;
1343 }
1344 break;
1345
1346 case SIOCSTGSZ :
1347 if (softn->ipf_nat_lock) {
1348 error = ipf_nat_getsz(softc, data, getlock);
1349 } else {
1350 IPFERROR(60017);
1351 error = EACCES;
1352 }
1353 break;
1354
1355 case SIOCSTGET :
1356 if (softn->ipf_nat_lock) {
1357 error = ipf_nat_getent(softc, data, getlock);
1358 } else {
1359 IPFERROR(60018);
1360 error = EACCES;
1361 }
1362 break;
1363
1364 case SIOCGENITER :
1365 {
1366 ipfgeniter_t iter;
1367 ipftoken_t *token;
1368 ipfobj_t obj;
1369
1370 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER);
1371 if (error != 0)
1372 break;
1373
1374 SPL_SCHED(s);
1375 token = ipf_token_find(softc, iter.igi_type, uid, ctx);
1376 if (token != NULL) {
1377 error = ipf_nat_iterator(softc, token, &iter, &obj);
1378 WRITE_ENTER(&softc->ipf_tokens);
1379 ipf_token_deref(softc, token);
1380 RWLOCK_EXIT(&softc->ipf_tokens);
1381 }
1382 SPL_X(s);
1383 break;
1384 }
1385
1386 case SIOCIPFDELTOK :
1387 error = BCOPYIN(data, &arg, sizeof(arg));
1388 if (error == 0) {
1389 SPL_SCHED(s);
1390 error = ipf_token_del(softc, arg, uid, ctx);
1391 SPL_X(s);
1392 } else {
1393 IPFERROR(60019);
1394 error = EFAULT;
1395 }
1396 break;
1397
1398 case SIOCGTQTAB :
1399 error = ipf_outobj(softc, data, softn->ipf_nat_tcptq,
1400 IPFOBJ_STATETQTAB);
1401 break;
1402
1403 case SIOCGTABL :
1404 error = ipf_nat_gettable(softc, softn, data);
1405 break;
1406
1407 default :
1408 IPFERROR(60020);
1409 error = EINVAL;
1410 break;
1411 }
1412 done:
1413 if (nat != NULL)
1414 ipf_nat_rule_fini(softc, nat);
1415 if (nt != NULL)
1416 KFREES(nt, nt->in_size);
1417 return error;
1418 }
1419
1420
1421 /* ------------------------------------------------------------------------ */
1422 /* Function: ipf_nat_siocaddnat */
1423 /* Returns: int - 0 == success, != 0 == failure */
1424 /* Parameters: softc(I) - pointer to soft context main structure */
1425 /* softn(I) - pointer to NAT context structure */
1426 /* n(I) - pointer to new NAT rule */
1427 /* np(I) - pointer to where to insert new NAT rule */
1428 /* getlock(I) - flag indicating if lock on is held */
1429 /* Mutex Locks: ipf_nat_io */
1430 /* */
1431 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1432 /* from information passed to the kernel, then add it to the appropriate */
1433 /* NAT rule table(s). */
1434 /* ------------------------------------------------------------------------ */
1435 static int
ipf_nat_siocaddnat(softc,softn,n,getlock)1436 ipf_nat_siocaddnat(softc, softn, n, getlock)
1437 ipf_main_softc_t *softc;
1438 ipf_nat_softc_t *softn;
1439 ipnat_t *n;
1440 int getlock;
1441 {
1442 int error = 0;
1443
1444 if (ipf_nat_resolverule(softc, n) != 0) {
1445 IPFERROR(60022);
1446 return ENOENT;
1447 }
1448
1449 if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) {
1450 IPFERROR(60023);
1451 return EINVAL;
1452 }
1453
1454 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) {
1455 /*
1456 * Prerecord whether or not the destination of the divert
1457 * is local or not to the interface the packet is going
1458 * to be sent out.
1459 */
1460 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1],
1461 n->in_ifps[1], &n->in_ndstip6);
1462 }
1463
1464 if (getlock) {
1465 WRITE_ENTER(&softc->ipf_nat);
1466 }
1467 n->in_next = NULL;
1468 n->in_pnext = softn->ipf_nat_list_tail;
1469 *n->in_pnext = n;
1470 softn->ipf_nat_list_tail = &n->in_next;
1471 n->in_use++;
1472
1473 if (n->in_redir & NAT_REDIRECT) {
1474 n->in_flags &= ~IPN_NOTDST;
1475 switch (n->in_v[0])
1476 {
1477 case 4 :
1478 ipf_nat_addrdr(softn, n);
1479 break;
1480 #ifdef USE_INET6
1481 case 6 :
1482 ipf_nat6_addrdr(softn, n);
1483 break;
1484 #endif
1485 default :
1486 break;
1487 }
1488 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr);
1489 }
1490
1491 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) {
1492 n->in_flags &= ~IPN_NOTSRC;
1493 switch (n->in_v[0])
1494 {
1495 case 4 :
1496 ipf_nat_addmap(softn, n);
1497 break;
1498 #ifdef USE_INET6
1499 case 6 :
1500 ipf_nat6_addmap(softn, n);
1501 break;
1502 #endif
1503 default :
1504 break;
1505 }
1506 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map);
1507 }
1508
1509 if (n->in_age[0] != 0)
1510 n->in_tqehead[0] = ipf_addtimeoutqueue(softc,
1511 &softn->ipf_nat_utqe,
1512 n->in_age[0]);
1513
1514 if (n->in_age[1] != 0)
1515 n->in_tqehead[1] = ipf_addtimeoutqueue(softc,
1516 &softn->ipf_nat_utqe,
1517 n->in_age[1]);
1518
1519 MUTEX_INIT(&n->in_lock, "ipnat rule lock");
1520
1521 n = NULL;
1522 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules);
1523 #if SOLARIS && !defined(INSTANCES)
1524 pfil_delayed_copy = 0;
1525 #endif
1526 if (getlock) {
1527 RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */
1528 }
1529
1530 return error;
1531 }
1532
1533
1534 /* ------------------------------------------------------------------------ */
1535 /* Function: ipf_nat_ruleaddrinit */
1536 /* Parameters: softc(I) - pointer to soft context main structure */
1537 /* softn(I) - pointer to NAT context structure */
1538 /* n(I) - pointer to NAT rule */
1539 /* */
1540 /* Initialise all of the NAT address structures in a NAT rule. */
1541 /* ------------------------------------------------------------------------ */
1542 static int
ipf_nat_ruleaddrinit(softc,softn,n)1543 ipf_nat_ruleaddrinit(softc, softn, n)
1544 ipf_main_softc_t *softc;
1545 ipf_nat_softc_t *softn;
1546 ipnat_t *n;
1547 {
1548 int idx, error;
1549
1550 if ((n->in_ndst.na_atype == FRI_LOOKUP) &&
1551 (n->in_ndst.na_type != IPLT_DSTLIST)) {
1552 IPFERROR(60071);
1553 return EINVAL;
1554 }
1555 if ((n->in_nsrc.na_atype == FRI_LOOKUP) &&
1556 (n->in_nsrc.na_type != IPLT_DSTLIST)) {
1557 IPFERROR(60069);
1558 return EINVAL;
1559 }
1560
1561 if (n->in_redir == NAT_BIMAP) {
1562 n->in_ndstaddr = n->in_osrcaddr;
1563 n->in_ndstmsk = n->in_osrcmsk;
1564 n->in_odstaddr = n->in_nsrcaddr;
1565 n->in_odstmsk = n->in_nsrcmsk;
1566
1567 }
1568
1569 if (n->in_redir & NAT_REDIRECT)
1570 idx = 1;
1571 else
1572 idx = 0;
1573 /*
1574 * Initialise all of the address fields.
1575 */
1576 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1,
1577 n->in_ifps[idx]);
1578 if (error != 0)
1579 return error;
1580
1581 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1,
1582 n->in_ifps[idx]);
1583 if (error != 0)
1584 return error;
1585
1586 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1,
1587 n->in_ifps[idx]);
1588 if (error != 0)
1589 return error;
1590
1591 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1,
1592 n->in_ifps[idx]);
1593 if (error != 0)
1594 return error;
1595
1596 if (n->in_redir & NAT_DIVERTUDP)
1597 ipf_nat_builddivertmp(softn, n);
1598
1599 return 0;
1600 }
1601
1602
1603 /* ------------------------------------------------------------------------ */
1604 /* Function: ipf_nat_resolvrule */
1605 /* Returns: Nil */
1606 /* Parameters: softc(I) - pointer to soft context main structure */
1607 /* n(I) - pointer to NAT rule */
1608 /* */
1609 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1610 /* from information passed to the kernel, then add it to the appropriate */
1611 /* NAT rule table(s). */
1612 /* ------------------------------------------------------------------------ */
1613 static int
ipf_nat_resolverule(softc,n)1614 ipf_nat_resolverule(softc, n)
1615 ipf_main_softc_t *softc;
1616 ipnat_t *n;
1617 {
1618 char *base;
1619
1620 base = n->in_names;
1621
1622 n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0],
1623 n->in_v[0]);
1624
1625 if (n->in_ifnames[1] == -1) {
1626 n->in_ifnames[1] = n->in_ifnames[0];
1627 n->in_ifps[1] = n->in_ifps[0];
1628 } else {
1629 n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1],
1630 n->in_v[1]);
1631 }
1632
1633 if (n->in_plabel != -1) {
1634 if (n->in_redir & NAT_REDIRECT)
1635 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft,
1636 n->in_pr[0],
1637 base + n->in_plabel);
1638 else
1639 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft,
1640 n->in_pr[1],
1641 base + n->in_plabel);
1642 if (n->in_apr == NULL)
1643 return -1;
1644 }
1645 return 0;
1646 }
1647
1648
1649 /* ------------------------------------------------------------------------ */
1650 /* Function: ipf_nat_siocdelnat */
1651 /* Returns: int - 0 == success, != 0 == failure */
1652 /* Parameters: softc(I) - pointer to soft context main structure */
1653 /* softn(I) - pointer to NAT context structure */
1654 /* n(I) - pointer to new NAT rule */
1655 /* getlock(I) - flag indicating if lock on is held */
1656 /* Mutex Locks: ipf_nat_io */
1657 /* */
1658 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */
1659 /* from information passed to the kernel, then add it to the appropriate */
1660 /* NAT rule table(s). */
1661 /* ------------------------------------------------------------------------ */
1662 static void
ipf_nat_siocdelnat(softc,softn,n,getlock)1663 ipf_nat_siocdelnat(softc, softn, n, getlock)
1664 ipf_main_softc_t *softc;
1665 ipf_nat_softc_t *softn;
1666 ipnat_t *n;
1667 int getlock;
1668 {
1669 if (getlock) {
1670 WRITE_ENTER(&softc->ipf_nat);
1671 }
1672
1673 ipf_nat_delrule(softc, softn, n, 1);
1674
1675 if (getlock) {
1676 RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */
1677 }
1678 }
1679
1680
1681 /* ------------------------------------------------------------------------ */
1682 /* Function: ipf_nat_getsz */
1683 /* Returns: int - 0 == success, != 0 is the error value. */
1684 /* Parameters: softc(I) - pointer to soft context main structure */
1685 /* data(I) - pointer to natget structure with kernel */
1686 /* pointer get the size of. */
1687 /* getlock(I) - flag indicating whether or not the caller */
1688 /* holds a lock on ipf_nat */
1689 /* */
1690 /* Handle SIOCSTGSZ. */
1691 /* Return the size of the nat list entry to be copied back to user space. */
1692 /* The size of the entry is stored in the ng_sz field and the enture natget */
1693 /* structure is copied back to the user. */
1694 /* ------------------------------------------------------------------------ */
1695 static int
ipf_nat_getsz(softc,data,getlock)1696 ipf_nat_getsz(softc, data, getlock)
1697 ipf_main_softc_t *softc;
1698 caddr_t data;
1699 int getlock;
1700 {
1701 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1702 ap_session_t *aps;
1703 nat_t *nat, *n;
1704 natget_t ng;
1705 int error;
1706
1707 error = BCOPYIN(data, &ng, sizeof(ng));
1708 if (error != 0) {
1709 IPFERROR(60024);
1710 return EFAULT;
1711 }
1712
1713 if (getlock) {
1714 READ_ENTER(&softc->ipf_nat);
1715 }
1716
1717 nat = ng.ng_ptr;
1718 if (!nat) {
1719 nat = softn->ipf_nat_instances;
1720 ng.ng_sz = 0;
1721 /*
1722 * Empty list so the size returned is 0. Simple.
1723 */
1724 if (nat == NULL) {
1725 if (getlock) {
1726 RWLOCK_EXIT(&softc->ipf_nat);
1727 }
1728 error = BCOPYOUT(&ng, data, sizeof(ng));
1729 if (error != 0) {
1730 IPFERROR(60025);
1731 return EFAULT;
1732 }
1733 return 0;
1734 }
1735 } else {
1736 /*
1737 * Make sure the pointer we're copying from exists in the
1738 * current list of entries. Security precaution to prevent
1739 * copying of random kernel data.
1740 */
1741 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
1742 if (n == nat)
1743 break;
1744 if (n == NULL) {
1745 if (getlock) {
1746 RWLOCK_EXIT(&softc->ipf_nat);
1747 }
1748 IPFERROR(60026);
1749 return ESRCH;
1750 }
1751 }
1752
1753 /*
1754 * Incluse any space required for proxy data structures.
1755 */
1756 ng.ng_sz = sizeof(nat_save_t);
1757 aps = nat->nat_aps;
1758 if (aps != NULL) {
1759 ng.ng_sz += sizeof(ap_session_t) - 4;
1760 if (aps->aps_data != 0)
1761 ng.ng_sz += aps->aps_psiz;
1762 }
1763 if (getlock) {
1764 RWLOCK_EXIT(&softc->ipf_nat);
1765 }
1766
1767 error = BCOPYOUT(&ng, data, sizeof(ng));
1768 if (error != 0) {
1769 IPFERROR(60027);
1770 return EFAULT;
1771 }
1772 return 0;
1773 }
1774
1775
1776 /* ------------------------------------------------------------------------ */
1777 /* Function: ipf_nat_getent */
1778 /* Returns: int - 0 == success, != 0 is the error value. */
1779 /* Parameters: softc(I) - pointer to soft context main structure */
1780 /* data(I) - pointer to natget structure with kernel pointer*/
1781 /* to NAT structure to copy out. */
1782 /* getlock(I) - flag indicating whether or not the caller */
1783 /* holds a lock on ipf_nat */
1784 /* */
1785 /* Handle SIOCSTGET. */
1786 /* Copies out NAT entry to user space. Any additional data held for a */
1787 /* proxy is also copied, as to is the NAT rule which was responsible for it */
1788 /* ------------------------------------------------------------------------ */
1789 static int
ipf_nat_getent(softc,data,getlock)1790 ipf_nat_getent(softc, data, getlock)
1791 ipf_main_softc_t *softc;
1792 caddr_t data;
1793 int getlock;
1794 {
1795 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1796 int error, outsize;
1797 ap_session_t *aps;
1798 nat_save_t *ipn, ipns;
1799 nat_t *n, *nat;
1800
1801 error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE);
1802 if (error != 0)
1803 return error;
1804
1805 if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) {
1806 IPFERROR(60028);
1807 return EINVAL;
1808 }
1809
1810 KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize);
1811 if (ipn == NULL) {
1812 IPFERROR(60029);
1813 return ENOMEM;
1814 }
1815
1816 if (getlock) {
1817 READ_ENTER(&softc->ipf_nat);
1818 }
1819
1820 ipn->ipn_dsize = ipns.ipn_dsize;
1821 nat = ipns.ipn_next;
1822 if (nat == NULL) {
1823 nat = softn->ipf_nat_instances;
1824 if (nat == NULL) {
1825 if (softn->ipf_nat_instances == NULL) {
1826 IPFERROR(60030);
1827 error = ENOENT;
1828 }
1829 goto finished;
1830 }
1831 } else {
1832 /*
1833 * Make sure the pointer we're copying from exists in the
1834 * current list of entries. Security precaution to prevent
1835 * copying of random kernel data.
1836 */
1837 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
1838 if (n == nat)
1839 break;
1840 if (n == NULL) {
1841 IPFERROR(60031);
1842 error = ESRCH;
1843 goto finished;
1844 }
1845 }
1846 ipn->ipn_next = nat->nat_next;
1847
1848 /*
1849 * Copy the NAT structure.
1850 */
1851 bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat));
1852
1853 /*
1854 * If we have a pointer to the NAT rule it belongs to, save that too.
1855 */
1856 if (nat->nat_ptr != NULL)
1857 bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat,
1858 ipn->ipn_ipnat.in_size);
1859
1860 /*
1861 * If we also know the NAT entry has an associated filter rule,
1862 * save that too.
1863 */
1864 if (nat->nat_fr != NULL)
1865 bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr,
1866 sizeof(ipn->ipn_fr));
1867
1868 /*
1869 * Last but not least, if there is an application proxy session set
1870 * up for this NAT entry, then copy that out too, including any
1871 * private data saved along side it by the proxy.
1872 */
1873 aps = nat->nat_aps;
1874 outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data);
1875 if (aps != NULL) {
1876 char *s;
1877
1878 if (outsize < sizeof(*aps)) {
1879 IPFERROR(60032);
1880 error = ENOBUFS;
1881 goto finished;
1882 }
1883
1884 s = ipn->ipn_data;
1885 bcopy((char *)aps, s, sizeof(*aps));
1886 s += sizeof(*aps);
1887 outsize -= sizeof(*aps);
1888 if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz))
1889 bcopy(aps->aps_data, s, aps->aps_psiz);
1890 else {
1891 IPFERROR(60033);
1892 error = ENOBUFS;
1893 }
1894 }
1895 if (error == 0) {
1896 error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE,
1897 ipns.ipn_dsize);
1898 }
1899
1900 finished:
1901 if (ipn != NULL) {
1902 KFREES(ipn, ipns.ipn_dsize);
1903 }
1904 if (getlock) {
1905 RWLOCK_EXIT(&softc->ipf_nat);
1906 }
1907 return error;
1908 }
1909
1910
1911 /* ------------------------------------------------------------------------ */
1912 /* Function: ipf_nat_putent */
1913 /* Returns: int - 0 == success, != 0 is the error value. */
1914 /* Parameters: softc(I) - pointer to soft context main structure */
1915 /* data(I) - pointer to natget structure with NAT */
1916 /* structure information to load into the kernel */
1917 /* getlock(I) - flag indicating whether or not a write lock */
1918 /* on is already held. */
1919 /* */
1920 /* Handle SIOCSTPUT. */
1921 /* Loads a NAT table entry from user space, including a NAT rule, proxy and */
1922 /* firewall rule data structures, if pointers to them indicate so. */
1923 /* ------------------------------------------------------------------------ */
1924 static int
ipf_nat_putent(softc,data,getlock)1925 ipf_nat_putent(softc, data, getlock)
1926 ipf_main_softc_t *softc;
1927 caddr_t data;
1928 int getlock;
1929 {
1930 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
1931 nat_save_t ipn, *ipnn;
1932 ap_session_t *aps;
1933 nat_t *n, *nat;
1934 frentry_t *fr;
1935 fr_info_t fin;
1936 ipnat_t *in;
1937 int error;
1938
1939 error = ipf_inobj(softc, data, NULL, &ipn, IPFOBJ_NATSAVE);
1940 if (error != 0)
1941 return error;
1942
1943 /*
1944 * Initialise early because of code at junkput label.
1945 */
1946 n = NULL;
1947 in = NULL;
1948 aps = NULL;
1949 nat = NULL;
1950 ipnn = NULL;
1951 fr = NULL;
1952
1953 /*
1954 * New entry, copy in the rest of the NAT entry if it's size is more
1955 * than just the nat_t structure.
1956 */
1957 if (ipn.ipn_dsize > sizeof(ipn)) {
1958 if (ipn.ipn_dsize > 81920) {
1959 IPFERROR(60034);
1960 error = ENOMEM;
1961 goto junkput;
1962 }
1963
1964 KMALLOCS(ipnn, nat_save_t *, ipn.ipn_dsize);
1965 if (ipnn == NULL) {
1966 IPFERROR(60035);
1967 return ENOMEM;
1968 }
1969
1970 bzero(ipnn, ipn.ipn_dsize);
1971 error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE,
1972 ipn.ipn_dsize);
1973 if (error != 0) {
1974 goto junkput;
1975 }
1976 } else
1977 ipnn = &ipn;
1978
1979 KMALLOC(nat, nat_t *);
1980 if (nat == NULL) {
1981 IPFERROR(60037);
1982 error = ENOMEM;
1983 goto junkput;
1984 }
1985
1986 bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat));
1987
1988 switch (nat->nat_v[0])
1989 {
1990 case 4:
1991 #ifdef USE_INET6
1992 case 6 :
1993 #endif
1994 break;
1995 default :
1996 IPFERROR(60061);
1997 error = EPROTONOSUPPORT;
1998 goto junkput;
1999 /*NOTREACHED*/
2000 }
2001
2002 /*
2003 * Initialize all these so that ipf_nat_delete() doesn't cause a crash.
2004 */
2005 bzero((char *)nat, offsetof(struct nat, nat_tqe));
2006 nat->nat_tqe.tqe_pnext = NULL;
2007 nat->nat_tqe.tqe_next = NULL;
2008 nat->nat_tqe.tqe_ifq = NULL;
2009 nat->nat_tqe.tqe_parent = nat;
2010
2011 /*
2012 * Restore the rule associated with this nat session
2013 */
2014 in = ipnn->ipn_nat.nat_ptr;
2015 if (in != NULL) {
2016 KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size);
2017 nat->nat_ptr = in;
2018 if (in == NULL) {
2019 IPFERROR(60038);
2020 error = ENOMEM;
2021 goto junkput;
2022 }
2023 bcopy((char *)&ipnn->ipn_ipnat, (char *)in,
2024 ipnn->ipn_ipnat.in_size);
2025 in->in_use = 1;
2026 in->in_flags |= IPN_DELETE;
2027
2028 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules);
2029
2030 if (ipf_nat_resolverule(softc, in) != 0) {
2031 IPFERROR(60039);
2032 error = ESRCH;
2033 goto junkput;
2034 }
2035 }
2036
2037 /*
2038 * Check that the NAT entry doesn't already exist in the kernel.
2039 *
2040 * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do
2041 * this, we check to see if the inbound combination of addresses and
2042 * ports is already known. Similar logic is applied for NAT_INBOUND.
2043 *
2044 */
2045 bzero((char *)&fin, sizeof(fin));
2046 fin.fin_v = nat->nat_v[0];
2047 fin.fin_p = nat->nat_pr[0];
2048 fin.fin_rev = nat->nat_rev;
2049 fin.fin_ifp = nat->nat_ifps[0];
2050 fin.fin_data[0] = ntohs(nat->nat_ndport);
2051 fin.fin_data[1] = ntohs(nat->nat_nsport);
2052
2053 switch (nat->nat_dir)
2054 {
2055 case NAT_OUTBOUND :
2056 case NAT_DIVERTOUT :
2057 if (getlock) {
2058 READ_ENTER(&softc->ipf_nat);
2059 }
2060
2061 fin.fin_v = nat->nat_v[1];
2062 if (nat->nat_v[1] == 4) {
2063 n = ipf_nat_inlookup(&fin, nat->nat_flags, fin.fin_p,
2064 nat->nat_ndstip, nat->nat_nsrcip);
2065 #ifdef USE_INET6
2066 } else if (nat->nat_v[1] == 6) {
2067 n = ipf_nat6_inlookup(&fin, nat->nat_flags, fin.fin_p,
2068 &nat->nat_ndst6.in6,
2069 &nat->nat_nsrc6.in6);
2070 #endif
2071 }
2072
2073 if (getlock) {
2074 RWLOCK_EXIT(&softc->ipf_nat);
2075 }
2076 if (n != NULL) {
2077 IPFERROR(60040);
2078 error = EEXIST;
2079 goto junkput;
2080 }
2081 break;
2082
2083 case NAT_INBOUND :
2084 case NAT_DIVERTIN :
2085 if (getlock) {
2086 READ_ENTER(&softc->ipf_nat);
2087 }
2088
2089 if (fin.fin_v == 4) {
2090 n = ipf_nat_outlookup(&fin, nat->nat_flags, fin.fin_p,
2091 nat->nat_ndstip,
2092 nat->nat_nsrcip);
2093 #ifdef USE_INET6
2094 } else if (fin.fin_v == 6) {
2095 n = ipf_nat6_outlookup(&fin, nat->nat_flags, fin.fin_p,
2096 &nat->nat_ndst6.in6,
2097 &nat->nat_nsrc6.in6);
2098 #endif
2099 }
2100
2101 if (getlock) {
2102 RWLOCK_EXIT(&softc->ipf_nat);
2103 }
2104 if (n != NULL) {
2105 IPFERROR(60041);
2106 error = EEXIST;
2107 goto junkput;
2108 }
2109 break;
2110
2111 default :
2112 IPFERROR(60042);
2113 error = EINVAL;
2114 goto junkput;
2115 }
2116
2117 /*
2118 * Restore ap_session_t structure. Include the private data allocated
2119 * if it was there.
2120 */
2121 aps = nat->nat_aps;
2122 if (aps != NULL) {
2123 KMALLOC(aps, ap_session_t *);
2124 nat->nat_aps = aps;
2125 if (aps == NULL) {
2126 IPFERROR(60043);
2127 error = ENOMEM;
2128 goto junkput;
2129 }
2130 bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps));
2131 if (in != NULL)
2132 aps->aps_apr = in->in_apr;
2133 else
2134 aps->aps_apr = NULL;
2135 if (aps->aps_psiz != 0) {
2136 if (aps->aps_psiz > 81920) {
2137 IPFERROR(60044);
2138 error = ENOMEM;
2139 goto junkput;
2140 }
2141 KMALLOCS(aps->aps_data, void *, aps->aps_psiz);
2142 if (aps->aps_data == NULL) {
2143 IPFERROR(60045);
2144 error = ENOMEM;
2145 goto junkput;
2146 }
2147 bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data,
2148 aps->aps_psiz);
2149 } else {
2150 aps->aps_psiz = 0;
2151 aps->aps_data = NULL;
2152 }
2153 }
2154
2155 /*
2156 * If there was a filtering rule associated with this entry then
2157 * build up a new one.
2158 */
2159 fr = nat->nat_fr;
2160 if (fr != NULL) {
2161 if ((nat->nat_flags & SI_NEWFR) != 0) {
2162 KMALLOC(fr, frentry_t *);
2163 nat->nat_fr = fr;
2164 if (fr == NULL) {
2165 IPFERROR(60046);
2166 error = ENOMEM;
2167 goto junkput;
2168 }
2169 ipnn->ipn_nat.nat_fr = fr;
2170 fr->fr_ref = 1;
2171 (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE);
2172 bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr));
2173
2174 fr->fr_ref = 1;
2175 fr->fr_dsize = 0;
2176 fr->fr_data = NULL;
2177 fr->fr_type = FR_T_NONE;
2178
2179 MUTEX_NUKE(&fr->fr_lock);
2180 MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock");
2181 } else {
2182 if (getlock) {
2183 READ_ENTER(&softc->ipf_nat);
2184 }
2185 for (n = softn->ipf_nat_instances; n; n = n->nat_next)
2186 if (n->nat_fr == fr)
2187 break;
2188
2189 if (n != NULL) {
2190 MUTEX_ENTER(&fr->fr_lock);
2191 fr->fr_ref++;
2192 MUTEX_EXIT(&fr->fr_lock);
2193 }
2194 if (getlock) {
2195 RWLOCK_EXIT(&softc->ipf_nat);
2196 }
2197
2198 if (n == NULL) {
2199 IPFERROR(60047);
2200 error = ESRCH;
2201 goto junkput;
2202 }
2203 }
2204 }
2205
2206 if (ipnn != &ipn) {
2207 KFREES(ipnn, ipn.ipn_dsize);
2208 ipnn = NULL;
2209 }
2210
2211 if (getlock) {
2212 WRITE_ENTER(&softc->ipf_nat);
2213 }
2214
2215 if (fin.fin_v == 4)
2216 error = ipf_nat_finalise(&fin, nat);
2217 #ifdef USE_INET6
2218 else
2219 error = ipf_nat6_finalise(&fin, nat);
2220 #endif
2221
2222 if (getlock) {
2223 RWLOCK_EXIT(&softc->ipf_nat);
2224 }
2225
2226 if (error == 0)
2227 return 0;
2228
2229 IPFERROR(60048);
2230 error = ENOMEM;
2231
2232 junkput:
2233 if (fr != NULL) {
2234 (void) ipf_derefrule(softc, &fr);
2235 }
2236
2237 if ((ipnn != NULL) && (ipnn != &ipn)) {
2238 KFREES(ipnn, ipn.ipn_dsize);
2239 }
2240 if (nat != NULL) {
2241 if (aps != NULL) {
2242 if (aps->aps_data != NULL) {
2243 KFREES(aps->aps_data, aps->aps_psiz);
2244 }
2245 KFREE(aps);
2246 }
2247 if (in != NULL) {
2248 if (in->in_apr)
2249 ipf_proxy_deref(in->in_apr);
2250 KFREES(in, in->in_size);
2251 }
2252 KFREE(nat);
2253 }
2254 return error;
2255 }
2256
2257
2258 /* ------------------------------------------------------------------------ */
2259 /* Function: ipf_nat_delete */
2260 /* Returns: Nil */
2261 /* Parameters: softc(I) - pointer to soft context main structure */
2262 /* nat(I) - pointer to NAT structure to delete */
2263 /* logtype(I) - type of LOG record to create before deleting */
2264 /* Write Lock: ipf_nat */
2265 /* */
2266 /* Delete a nat entry from the various lists and table. If NAT logging is */
2267 /* enabled then generate a NAT log record for this event. */
2268 /* ------------------------------------------------------------------------ */
2269 void
ipf_nat_delete(softc,nat,logtype)2270 ipf_nat_delete(softc, nat, logtype)
2271 ipf_main_softc_t *softc;
2272 struct nat *nat;
2273 int logtype;
2274 {
2275 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2276 int madeorphan = 0, bkt, removed = 0;
2277 nat_stat_side_t *nss;
2278 struct ipnat *ipn;
2279
2280 if (logtype != 0 && softn->ipf_nat_logging != 0)
2281 ipf_nat_log(softc, softn, nat, logtype);
2282
2283 /*
2284 * Take it as a general indication that all the pointers are set if
2285 * nat_pnext is set.
2286 */
2287 if (nat->nat_pnext != NULL) {
2288 removed = 1;
2289
2290 bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz;
2291 nss = &softn->ipf_nat_stats.ns_side[0];
2292 if (nss->ns_bucketlen[bkt] > 0)
2293 nss->ns_bucketlen[bkt]--;
2294 if (nss->ns_bucketlen[bkt] == 0) {
2295 nss->ns_inuse--;
2296 }
2297
2298 bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz;
2299 nss = &softn->ipf_nat_stats.ns_side[1];
2300 if (nss->ns_bucketlen[bkt] > 0)
2301 nss->ns_bucketlen[bkt]--;
2302 if (nss->ns_bucketlen[bkt] == 0) {
2303 nss->ns_inuse--;
2304 }
2305
2306 *nat->nat_pnext = nat->nat_next;
2307 if (nat->nat_next != NULL) {
2308 nat->nat_next->nat_pnext = nat->nat_pnext;
2309 nat->nat_next = NULL;
2310 }
2311 nat->nat_pnext = NULL;
2312
2313 *nat->nat_phnext[0] = nat->nat_hnext[0];
2314 if (nat->nat_hnext[0] != NULL) {
2315 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0];
2316 nat->nat_hnext[0] = NULL;
2317 }
2318 nat->nat_phnext[0] = NULL;
2319
2320 *nat->nat_phnext[1] = nat->nat_hnext[1];
2321 if (nat->nat_hnext[1] != NULL) {
2322 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1];
2323 nat->nat_hnext[1] = NULL;
2324 }
2325 nat->nat_phnext[1] = NULL;
2326
2327 if ((nat->nat_flags & SI_WILDP) != 0) {
2328 ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds);
2329 }
2330 madeorphan = 1;
2331 }
2332
2333 if (nat->nat_me != NULL) {
2334 *nat->nat_me = NULL;
2335 nat->nat_me = NULL;
2336 nat->nat_ref--;
2337 ASSERT(nat->nat_ref >= 0);
2338 }
2339
2340 if (nat->nat_tqe.tqe_ifq != NULL) {
2341 /*
2342 * No call to ipf_freetimeoutqueue() is made here, they are
2343 * garbage collected in ipf_nat_expire().
2344 */
2345 (void) ipf_deletequeueentry(&nat->nat_tqe);
2346 }
2347
2348 if (nat->nat_sync) {
2349 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync);
2350 nat->nat_sync = NULL;
2351 }
2352
2353 if (logtype == NL_EXPIRE)
2354 softn->ipf_nat_stats.ns_expire++;
2355
2356 MUTEX_ENTER(&nat->nat_lock);
2357 /*
2358 * NL_DESTROY should only be passed in when we've got nat_ref >= 2.
2359 * This happens when a nat'd packet is blocked and we want to throw
2360 * away the NAT session.
2361 */
2362 if (logtype == NL_DESTROY) {
2363 if (nat->nat_ref > 2) {
2364 nat->nat_ref -= 2;
2365 MUTEX_EXIT(&nat->nat_lock);
2366 if (removed)
2367 softn->ipf_nat_stats.ns_orphans++;
2368 return;
2369 }
2370 } else if (nat->nat_ref > 1) {
2371 nat->nat_ref--;
2372 MUTEX_EXIT(&nat->nat_lock);
2373 if (madeorphan == 1)
2374 softn->ipf_nat_stats.ns_orphans++;
2375 return;
2376 }
2377 ASSERT(nat->nat_ref >= 0);
2378 MUTEX_EXIT(&nat->nat_lock);
2379
2380 nat->nat_ref = 0;
2381
2382 if (madeorphan == 0)
2383 softn->ipf_nat_stats.ns_orphans--;
2384
2385 /*
2386 * At this point, nat_ref can be either 0 or -1
2387 */
2388 softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--;
2389
2390 if (nat->nat_fr != NULL) {
2391 (void) ipf_derefrule(softc, &nat->nat_fr);
2392 }
2393
2394 if (nat->nat_hm != NULL) {
2395 ipf_nat_hostmapdel(softc, &nat->nat_hm);
2396 }
2397
2398 /*
2399 * If there is an active reference from the nat entry to its parent
2400 * rule, decrement the rule's reference count and free it too if no
2401 * longer being used.
2402 */
2403 ipn = nat->nat_ptr;
2404 nat->nat_ptr = NULL;
2405
2406 if (ipn != NULL) {
2407 ipn->in_space++;
2408 ipf_nat_rule_deref(softc, &ipn);
2409 }
2410
2411 if (nat->nat_aps != NULL) {
2412 ipf_proxy_free(softc, nat->nat_aps);
2413 nat->nat_aps = NULL;
2414 }
2415
2416 MUTEX_DESTROY(&nat->nat_lock);
2417
2418 softn->ipf_nat_stats.ns_active--;
2419
2420 /*
2421 * If there's a fragment table entry too for this nat entry, then
2422 * dereference that as well. This is after nat_lock is released
2423 * because of Tru64.
2424 */
2425 ipf_frag_natforget(softc, (void *)nat);
2426
2427 KFREE(nat);
2428 }
2429
2430
2431 /* ------------------------------------------------------------------------ */
2432 /* Function: ipf_nat_flushtable */
2433 /* Returns: int - number of NAT rules deleted */
2434 /* Parameters: softc(I) - pointer to soft context main structure */
2435 /* softn(I) - pointer to NAT context structure */
2436 /* Write Lock: ipf_nat */
2437 /* */
2438 /* Deletes all currently active NAT sessions. In deleting each NAT entry a */
2439 /* log record should be emitted in ipf_nat_delete() if NAT logging is */
2440 /* enabled. */
2441 /* ------------------------------------------------------------------------ */
2442 /*
2443 * nat_flushtable - clear the NAT table of all mapping entries.
2444 */
2445 static int
ipf_nat_flushtable(softc,softn)2446 ipf_nat_flushtable(softc, softn)
2447 ipf_main_softc_t *softc;
2448 ipf_nat_softc_t *softn;
2449 {
2450 nat_t *nat;
2451 int j = 0;
2452
2453 /*
2454 * ALL NAT mappings deleted, so lets just make the deletions
2455 * quicker.
2456 */
2457 if (softn->ipf_nat_table[0] != NULL)
2458 bzero((char *)softn->ipf_nat_table[0],
2459 sizeof(softn->ipf_nat_table[0]) *
2460 softn->ipf_nat_table_sz);
2461 if (softn->ipf_nat_table[1] != NULL)
2462 bzero((char *)softn->ipf_nat_table[1],
2463 sizeof(softn->ipf_nat_table[1]) *
2464 softn->ipf_nat_table_sz);
2465
2466 while ((nat = softn->ipf_nat_instances) != NULL) {
2467 ipf_nat_delete(softc, nat, NL_FLUSH);
2468 j++;
2469 }
2470
2471 return j;
2472 }
2473
2474
2475 /* ------------------------------------------------------------------------ */
2476 /* Function: ipf_nat_clearlist */
2477 /* Returns: int - number of NAT/RDR rules deleted */
2478 /* Parameters: softc(I) - pointer to soft context main structure */
2479 /* softn(I) - pointer to NAT context structure */
2480 /* */
2481 /* Delete all rules in the current list of rules. There is nothing elegant */
2482 /* about this cleanup: simply free all entries on the list of rules and */
2483 /* clear out the tables used for hashed NAT rule lookups. */
2484 /* ------------------------------------------------------------------------ */
2485 static int
ipf_nat_clearlist(softc,softn)2486 ipf_nat_clearlist(softc, softn)
2487 ipf_main_softc_t *softc;
2488 ipf_nat_softc_t *softn;
2489 {
2490 ipnat_t *n;
2491 int i = 0;
2492
2493 if (softn->ipf_nat_map_rules != NULL) {
2494 bzero((char *)softn->ipf_nat_map_rules,
2495 sizeof(*softn->ipf_nat_map_rules) *
2496 softn->ipf_nat_maprules_sz);
2497 }
2498 if (softn->ipf_nat_rdr_rules != NULL) {
2499 bzero((char *)softn->ipf_nat_rdr_rules,
2500 sizeof(*softn->ipf_nat_rdr_rules) *
2501 softn->ipf_nat_rdrrules_sz);
2502 }
2503
2504 while ((n = softn->ipf_nat_list) != NULL) {
2505 ipf_nat_delrule(softc, softn, n, 0);
2506 i++;
2507 }
2508 #if SOLARIS && !defined(INSTANCES)
2509 pfil_delayed_copy = 1;
2510 #endif
2511 return i;
2512 }
2513
2514
2515 /* ------------------------------------------------------------------------ */
2516 /* Function: ipf_nat_delrule */
2517 /* Returns: Nil */
2518 /* Parameters: softc(I) - pointer to soft context main structure */
2519 /* softn(I) - pointer to NAT context structure */
2520 /* np(I) - pointer to NAT rule to delete */
2521 /* purge(I) - 1 == allow purge, 0 == prevent purge */
2522 /* Locks: WRITE(ipf_nat) */
2523 /* */
2524 /* Preventing "purge" from occuring is allowed because when all of the NAT */
2525 /* rules are being removed, allowing the "purge" to walk through the list */
2526 /* of NAT sessions, possibly multiple times, would be a large performance */
2527 /* hit, on the order of O(N^2). */
2528 /* ------------------------------------------------------------------------ */
2529 static void
ipf_nat_delrule(softc,softn,np,purge)2530 ipf_nat_delrule(softc, softn, np, purge)
2531 ipf_main_softc_t *softc;
2532 ipf_nat_softc_t *softn;
2533 ipnat_t *np;
2534 int purge;
2535 {
2536
2537 if (np->in_pnext != NULL) {
2538 *np->in_pnext = np->in_next;
2539 if (np->in_next != NULL)
2540 np->in_next->in_pnext = np->in_pnext;
2541 if (softn->ipf_nat_list_tail == &np->in_next)
2542 softn->ipf_nat_list_tail = np->in_pnext;
2543 }
2544
2545 if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) {
2546 nat_t *next;
2547 nat_t *nat;
2548
2549 for (next = softn->ipf_nat_instances; (nat = next) != NULL;) {
2550 next = nat->nat_next;
2551 if (nat->nat_ptr == np)
2552 ipf_nat_delete(softc, nat, NL_PURGE);
2553 }
2554 }
2555
2556 if ((np->in_flags & IPN_DELETE) == 0) {
2557 if (np->in_redir & NAT_REDIRECT) {
2558 switch (np->in_v[0])
2559 {
2560 case 4 :
2561 ipf_nat_delrdr(softn, np);
2562 break;
2563 #ifdef USE_INET6
2564 case 6 :
2565 ipf_nat6_delrdr(softn, np);
2566 break;
2567 #endif
2568 }
2569 }
2570 if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) {
2571 switch (np->in_v[0])
2572 {
2573 case 4 :
2574 ipf_nat_delmap(softn, np);
2575 break;
2576 #ifdef USE_INET6
2577 case 6 :
2578 ipf_nat6_delmap(softn, np);
2579 break;
2580 #endif
2581 }
2582 }
2583 }
2584
2585 np->in_flags |= IPN_DELETE;
2586 ipf_nat_rule_deref(softc, &np);
2587 }
2588
2589
2590 /* ------------------------------------------------------------------------ */
2591 /* Function: ipf_nat_newmap */
2592 /* Returns: int - -1 == error, 0 == success */
2593 /* Parameters: fin(I) - pointer to packet information */
2594 /* nat(I) - pointer to NAT entry */
2595 /* ni(I) - pointer to structure with misc. information needed */
2596 /* to create new NAT entry. */
2597 /* */
2598 /* Given an empty NAT structure, populate it with new information about a */
2599 /* new NAT session, as defined by the matching NAT rule. */
2600 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
2601 /* to the new IP address for the translation. */
2602 /* ------------------------------------------------------------------------ */
2603 static int
ipf_nat_newmap(fin,nat,ni)2604 ipf_nat_newmap(fin, nat, ni)
2605 fr_info_t *fin;
2606 nat_t *nat;
2607 natinfo_t *ni;
2608 {
2609 ipf_main_softc_t *softc = fin->fin_main_soft;
2610 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2611 u_short st_port, dport, sport, port, sp, dp;
2612 struct in_addr in, inb;
2613 hostmap_t *hm;
2614 u_32_t flags;
2615 u_32_t st_ip;
2616 ipnat_t *np;
2617 nat_t *natl;
2618 int l;
2619
2620 /*
2621 * If it's an outbound packet which doesn't match any existing
2622 * record, then create a new port
2623 */
2624 l = 0;
2625 hm = NULL;
2626 np = ni->nai_np;
2627 st_ip = np->in_snip;
2628 st_port = np->in_spnext;
2629 flags = nat->nat_flags;
2630
2631 if (flags & IPN_ICMPQUERY) {
2632 sport = fin->fin_data[1];
2633 dport = 0;
2634 } else {
2635 sport = htons(fin->fin_data[0]);
2636 dport = htons(fin->fin_data[1]);
2637 }
2638
2639 /*
2640 * Do a loop until we either run out of entries to try or we find
2641 * a NAT mapping that isn't currently being used. This is done
2642 * because the change to the source is not (usually) being fixed.
2643 */
2644 do {
2645 port = 0;
2646 in.s_addr = htonl(np->in_snip);
2647 if (l == 0) {
2648 /*
2649 * Check to see if there is an existing NAT
2650 * setup for this IP address pair.
2651 */
2652 hm = ipf_nat_hostmap(softn, np, fin->fin_src,
2653 fin->fin_dst, in, 0);
2654 if (hm != NULL)
2655 in.s_addr = hm->hm_nsrcip.s_addr;
2656 } else if ((l == 1) && (hm != NULL)) {
2657 ipf_nat_hostmapdel(softc, &hm);
2658 }
2659 in.s_addr = ntohl(in.s_addr);
2660
2661 nat->nat_hm = hm;
2662
2663 if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) {
2664 if (l > 0) {
2665 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1);
2666 DT4(ns_exhausted_1, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np);
2667 return -1;
2668 }
2669 }
2670
2671 if (np->in_redir == NAT_BIMAP &&
2672 np->in_osrcmsk == np->in_nsrcmsk) {
2673 /*
2674 * map the address block in a 1:1 fashion
2675 */
2676 in.s_addr = np->in_nsrcaddr;
2677 in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk;
2678 in.s_addr = ntohl(in.s_addr);
2679
2680 } else if (np->in_redir & NAT_MAPBLK) {
2681 if ((l >= np->in_ppip) || ((l > 0) &&
2682 !(flags & IPN_TCPUDP))) {
2683 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2);
2684 DT4(ns_exhausted_2, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np);
2685 return -1;
2686 }
2687 /*
2688 * map-block - Calculate destination address.
2689 */
2690 in.s_addr = ntohl(fin->fin_saddr);
2691 in.s_addr &= ntohl(~np->in_osrcmsk);
2692 inb.s_addr = in.s_addr;
2693 in.s_addr /= np->in_ippip;
2694 in.s_addr &= ntohl(~np->in_nsrcmsk);
2695 in.s_addr += ntohl(np->in_nsrcaddr);
2696 /*
2697 * Calculate destination port.
2698 */
2699 if ((flags & IPN_TCPUDP) &&
2700 (np->in_ppip != 0)) {
2701 port = ntohs(sport) + l;
2702 port %= np->in_ppip;
2703 port += np->in_ppip *
2704 (inb.s_addr % np->in_ippip);
2705 port += MAPBLK_MINPORT;
2706 port = htons(port);
2707 }
2708
2709 } else if ((np->in_nsrcaddr == 0) &&
2710 (np->in_nsrcmsk == 0xffffffff)) {
2711 i6addr_t in6;
2712
2713 /*
2714 * 0/32 - use the interface's IP address.
2715 */
2716 if ((l > 0) ||
2717 ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp,
2718 &in6, NULL) == -1) {
2719 NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1);
2720 DT4(ns_new_ifpaddr_1, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np);
2721 return -1;
2722 }
2723 in.s_addr = ntohl(in6.in4.s_addr);
2724
2725 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) {
2726 /*
2727 * 0/0 - use the original source address/port.
2728 */
2729 if (l > 0) {
2730 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3);
2731 DT4(ns_exhausted_3, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np);
2732 return -1;
2733 }
2734 in.s_addr = ntohl(fin->fin_saddr);
2735
2736 } else if ((np->in_nsrcmsk != 0xffffffff) &&
2737 (np->in_spnext == 0) && ((l > 0) || (hm == NULL)))
2738 np->in_snip++;
2739
2740 natl = NULL;
2741
2742 if ((flags & IPN_TCPUDP) &&
2743 ((np->in_redir & NAT_MAPBLK) == 0) &&
2744 (np->in_flags & IPN_AUTOPORTMAP)) {
2745 /*
2746 * "ports auto" (without map-block)
2747 */
2748 if ((l > 0) && (l % np->in_ppip == 0)) {
2749 if ((l > np->in_ppip) &&
2750 np->in_nsrcmsk != 0xffffffff)
2751 np->in_snip++;
2752 }
2753 if (np->in_ppip != 0) {
2754 port = ntohs(sport);
2755 port += (l % np->in_ppip);
2756 port %= np->in_ppip;
2757 port += np->in_ppip *
2758 (ntohl(fin->fin_saddr) %
2759 np->in_ippip);
2760 port += MAPBLK_MINPORT;
2761 port = htons(port);
2762 }
2763
2764 } else if (((np->in_redir & NAT_MAPBLK) == 0) &&
2765 (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) {
2766 /*
2767 * Standard port translation. Select next port.
2768 */
2769 if (np->in_flags & IPN_SEQUENTIAL) {
2770 port = np->in_spnext;
2771 } else {
2772 port = ipf_random() % (np->in_spmax -
2773 np->in_spmin + 1);
2774 port += np->in_spmin;
2775 }
2776 port = htons(port);
2777 np->in_spnext++;
2778
2779 if (np->in_spnext > np->in_spmax) {
2780 np->in_spnext = np->in_spmin;
2781 if (np->in_nsrcmsk != 0xffffffff)
2782 np->in_snip++;
2783 }
2784 }
2785
2786 if (np->in_flags & IPN_SIPRANGE) {
2787 if (np->in_snip > ntohl(np->in_nsrcmsk))
2788 np->in_snip = ntohl(np->in_nsrcaddr);
2789 } else {
2790 if ((np->in_nsrcmsk != 0xffffffff) &&
2791 ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) >
2792 ntohl(np->in_nsrcaddr))
2793 np->in_snip = ntohl(np->in_nsrcaddr) + 1;
2794 }
2795
2796 if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY)))
2797 port = sport;
2798
2799 /*
2800 * Here we do a lookup of the connection as seen from
2801 * the outside. If an IP# pair already exists, try
2802 * again. So if you have A->B becomes C->B, you can
2803 * also have D->E become C->E but not D->B causing
2804 * another C->B. Also take protocol and ports into
2805 * account when determining whether a pre-existing
2806 * NAT setup will cause an external conflict where
2807 * this is appropriate.
2808 */
2809 inb.s_addr = htonl(in.s_addr);
2810 sp = fin->fin_data[0];
2811 dp = fin->fin_data[1];
2812 fin->fin_data[0] = fin->fin_data[1];
2813 fin->fin_data[1] = ntohs(port);
2814 natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
2815 (u_int)fin->fin_p, fin->fin_dst, inb);
2816 fin->fin_data[0] = sp;
2817 fin->fin_data[1] = dp;
2818
2819 /*
2820 * Has the search wrapped around and come back to the
2821 * start ?
2822 */
2823 if ((natl != NULL) &&
2824 (np->in_spnext != 0) && (st_port == np->in_spnext) &&
2825 (np->in_snip != 0) && (st_ip == np->in_snip)) {
2826 NBUMPSIDED(1, ns_wrap);
2827 DT4(ns_wrap, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np);
2828 return -1;
2829 }
2830 l++;
2831 } while (natl != NULL);
2832
2833 /* Setup the NAT table */
2834 nat->nat_osrcip = fin->fin_src;
2835 nat->nat_nsrcaddr = htonl(in.s_addr);
2836 nat->nat_odstip = fin->fin_dst;
2837 nat->nat_ndstip = fin->fin_dst;
2838 if (nat->nat_hm == NULL)
2839 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src,
2840 fin->fin_dst, nat->nat_nsrcip,
2841 0);
2842
2843 if (flags & IPN_TCPUDP) {
2844 nat->nat_osport = sport;
2845 nat->nat_nsport = port; /* sport */
2846 nat->nat_odport = dport;
2847 nat->nat_ndport = dport;
2848 ((tcphdr_t *)fin->fin_dp)->th_sport = port;
2849 } else if (flags & IPN_ICMPQUERY) {
2850 nat->nat_oicmpid = fin->fin_data[1];
2851 ((icmphdr_t *)fin->fin_dp)->icmp_id = port;
2852 nat->nat_nicmpid = port;
2853 }
2854 return 0;
2855 }
2856
2857
2858 /* ------------------------------------------------------------------------ */
2859 /* Function: ipf_nat_newrdr */
2860 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */
2861 /* allow rule to be moved if IPN_ROUNDR is set. */
2862 /* Parameters: fin(I) - pointer to packet information */
2863 /* nat(I) - pointer to NAT entry */
2864 /* ni(I) - pointer to structure with misc. information needed */
2865 /* to create new NAT entry. */
2866 /* */
2867 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/
2868 /* to the new IP address for the translation. */
2869 /* ------------------------------------------------------------------------ */
2870 static int
ipf_nat_newrdr(fin,nat,ni)2871 ipf_nat_newrdr(fin, nat, ni)
2872 fr_info_t *fin;
2873 nat_t *nat;
2874 natinfo_t *ni;
2875 {
2876 ipf_main_softc_t *softc = fin->fin_main_soft;
2877 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
2878 u_short nport, dport, sport;
2879 struct in_addr in, inb;
2880 u_short sp, dp;
2881 hostmap_t *hm;
2882 u_32_t flags;
2883 ipnat_t *np;
2884 nat_t *natl;
2885 int move;
2886
2887 move = 1;
2888 hm = NULL;
2889 in.s_addr = 0;
2890 np = ni->nai_np;
2891 flags = nat->nat_flags;
2892
2893 if (flags & IPN_ICMPQUERY) {
2894 dport = fin->fin_data[1];
2895 sport = 0;
2896 } else {
2897 sport = htons(fin->fin_data[0]);
2898 dport = htons(fin->fin_data[1]);
2899 }
2900
2901 /* TRACE sport, dport */
2902
2903
2904 /*
2905 * If the matching rule has IPN_STICKY set, then we want to have the
2906 * same rule kick in as before. Why would this happen? If you have
2907 * a collection of rdr rules with "round-robin sticky", the current
2908 * packet might match a different one to the previous connection but
2909 * we want the same destination to be used.
2910 */
2911 if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) &&
2912 ((np->in_flags & IPN_STICKY) != 0)) {
2913 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst,
2914 in, (u_32_t)dport);
2915 if (hm != NULL) {
2916 in.s_addr = ntohl(hm->hm_ndstip.s_addr);
2917 np = hm->hm_ipnat;
2918 ni->nai_np = np;
2919 move = 0;
2920 ipf_nat_hostmapdel(softc, &hm);
2921 }
2922 }
2923
2924 /*
2925 * Otherwise, it's an inbound packet. Most likely, we don't
2926 * want to rewrite source ports and source addresses. Instead,
2927 * we want to rewrite to a fixed internal address and fixed
2928 * internal port.
2929 */
2930 if (np->in_flags & IPN_SPLIT) {
2931 in.s_addr = np->in_dnip;
2932 inb.s_addr = htonl(in.s_addr);
2933
2934 if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) {
2935 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src,
2936 fin->fin_dst, inb, (u_32_t)dport);
2937 if (hm != NULL) {
2938 in.s_addr = hm->hm_ndstip.s_addr;
2939 move = 0;
2940 }
2941 }
2942
2943 if (hm == NULL || hm->hm_ref == 1) {
2944 if (np->in_ndstaddr == htonl(in.s_addr)) {
2945 np->in_dnip = ntohl(np->in_ndstmsk);
2946 move = 0;
2947 } else {
2948 np->in_dnip = ntohl(np->in_ndstaddr);
2949 }
2950 }
2951 if (hm != NULL)
2952 ipf_nat_hostmapdel(softc, &hm);
2953
2954 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) {
2955 i6addr_t in6;
2956
2957 /*
2958 * 0/32 - use the interface's IP address.
2959 */
2960 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp,
2961 &in6, NULL) == -1) {
2962 NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2);
2963 DT3(ns_new_ifpaddr_2, fr_info_t *, fin, nat_t *, nat, natinfo_t, ni);
2964 return -1;
2965 }
2966 in.s_addr = ntohl(in6.in4.s_addr);
2967
2968 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) {
2969 /*
2970 * 0/0 - use the original destination address/port.
2971 */
2972 in.s_addr = ntohl(fin->fin_daddr);
2973
2974 } else if (np->in_redir == NAT_BIMAP &&
2975 np->in_ndstmsk == np->in_odstmsk) {
2976 /*
2977 * map the address block in a 1:1 fashion
2978 */
2979 in.s_addr = np->in_ndstaddr;
2980 in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk;
2981 in.s_addr = ntohl(in.s_addr);
2982 } else {
2983 in.s_addr = ntohl(np->in_ndstaddr);
2984 }
2985
2986 if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0))
2987 nport = dport;
2988 else {
2989 /*
2990 * Whilst not optimized for the case where
2991 * pmin == pmax, the gain is not significant.
2992 */
2993 if (((np->in_flags & IPN_FIXEDDPORT) == 0) &&
2994 (np->in_odport != np->in_dtop)) {
2995 nport = ntohs(dport) - np->in_odport + np->in_dpmax;
2996 nport = htons(nport);
2997 } else {
2998 nport = htons(np->in_dpnext);
2999 np->in_dpnext++;
3000 if (np->in_dpnext > np->in_dpmax)
3001 np->in_dpnext = np->in_dpmin;
3002 }
3003 }
3004
3005 /*
3006 * When the redirect-to address is set to 0.0.0.0, just
3007 * assume a blank `forwarding' of the packet. We don't
3008 * setup any translation for this either.
3009 */
3010 if (in.s_addr == 0) {
3011 if (nport == dport) {
3012 NBUMPSIDED(0, ns_xlate_null);
3013 return -1;
3014 }
3015 in.s_addr = ntohl(fin->fin_daddr);
3016 }
3017
3018 /*
3019 * Check to see if this redirect mapping already exists and if
3020 * it does, return "failure" (allowing it to be created will just
3021 * cause one or both of these "connections" to stop working.)
3022 */
3023 inb.s_addr = htonl(in.s_addr);
3024 sp = fin->fin_data[0];
3025 dp = fin->fin_data[1];
3026 fin->fin_data[1] = fin->fin_data[0];
3027 fin->fin_data[0] = ntohs(nport);
3028 natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH),
3029 (u_int)fin->fin_p, inb, fin->fin_src);
3030 fin->fin_data[0] = sp;
3031 fin->fin_data[1] = dp;
3032 if (natl != NULL) {
3033 DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl);
3034 NBUMPSIDE(0, ns_xlate_exists);
3035 return -1;
3036 }
3037
3038 inb.s_addr = htonl(in.s_addr);
3039 nat->nat_ndstaddr = htonl(in.s_addr);
3040 nat->nat_odstip = fin->fin_dst;
3041 nat->nat_nsrcip = fin->fin_src;
3042 nat->nat_osrcip = fin->fin_src;
3043 if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0))
3044 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src,
3045 fin->fin_dst, inb, (u_32_t)dport);
3046
3047 if (flags & IPN_TCPUDP) {
3048 nat->nat_odport = dport;
3049 nat->nat_ndport = nport;
3050 nat->nat_osport = sport;
3051 nat->nat_nsport = sport;
3052 ((tcphdr_t *)fin->fin_dp)->th_dport = nport;
3053 } else if (flags & IPN_ICMPQUERY) {
3054 nat->nat_oicmpid = fin->fin_data[1];
3055 ((icmphdr_t *)fin->fin_dp)->icmp_id = nport;
3056 nat->nat_nicmpid = nport;
3057 }
3058
3059 return move;
3060 }
3061
3062 /* ------------------------------------------------------------------------ */
3063 /* Function: ipf_nat_add */
3064 /* Returns: nat_t* - NULL == failure to create new NAT structure, */
3065 /* else pointer to new NAT structure */
3066 /* Parameters: fin(I) - pointer to packet information */
3067 /* np(I) - pointer to NAT rule */
3068 /* natsave(I) - pointer to where to store NAT struct pointer */
3069 /* flags(I) - flags describing the current packet */
3070 /* direction(I) - direction of packet (in/out) */
3071 /* Write Lock: ipf_nat */
3072 /* */
3073 /* Attempts to create a new NAT entry. Does not actually change the packet */
3074 /* in any way. */
3075 /* */
3076 /* This function is in three main parts: (1) deal with creating a new NAT */
3077 /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */
3078 /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */
3079 /* and (3) building that structure and putting it into the NAT table(s). */
3080 /* */
3081 /* NOTE: natsave should NOT be used to point back to an ipstate_t struct */
3082 /* as it can result in memory being corrupted. */
3083 /* ------------------------------------------------------------------------ */
3084 nat_t *
ipf_nat_add(fin,np,natsave,flags,direction)3085 ipf_nat_add(fin, np, natsave, flags, direction)
3086 fr_info_t *fin;
3087 ipnat_t *np;
3088 nat_t **natsave;
3089 u_int flags;
3090 int direction;
3091 {
3092 ipf_main_softc_t *softc = fin->fin_main_soft;
3093 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3094 hostmap_t *hm = NULL;
3095 nat_t *nat, *natl;
3096 natstat_t *nsp;
3097 u_int nflags;
3098 natinfo_t ni;
3099 int move;
3100
3101 nsp = &softn->ipf_nat_stats;
3102
3103 if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) >
3104 softn->ipf_nat_table_wm_high) {
3105 softn->ipf_nat_doflush = 1;
3106 }
3107
3108 if (nsp->ns_active >= softn->ipf_nat_table_max) {
3109 NBUMPSIDED(fin->fin_out, ns_table_max);
3110 DT2(ns_table_max, nat_stat_t *, nsp, ipf_nat_softc_t *, softn);
3111 return NULL;
3112 }
3113
3114 move = 1;
3115 nflags = np->in_flags & flags;
3116 nflags &= NAT_FROMRULE;
3117
3118 ni.nai_np = np;
3119 ni.nai_dport = 0;
3120 ni.nai_sport = 0;
3121
3122 /* Give me a new nat */
3123 KMALLOC(nat, nat_t *);
3124 if (nat == NULL) {
3125 DT(ns_memfail);
3126 NBUMPSIDED(fin->fin_out, ns_memfail);
3127 /*
3128 * Try to automatically tune the max # of entries in the
3129 * table allowed to be less than what will cause kmem_alloc()
3130 * to fail and try to eliminate panics due to out of memory
3131 * conditions arising.
3132 */
3133 if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) &&
3134 (nsp->ns_active > 100)) {
3135 softn->ipf_nat_table_max = nsp->ns_active - 100;
3136 printf("table_max reduced to %d\n",
3137 softn->ipf_nat_table_max);
3138 }
3139 return NULL;
3140 }
3141
3142 if (flags & IPN_ICMPQUERY) {
3143 /*
3144 * In the ICMP query NAT code, we translate the ICMP id fields
3145 * to make them unique. This is indepedent of the ICMP type
3146 * (e.g. in the unlikely event that a host sends an echo and
3147 * an tstamp request with the same id, both packets will have
3148 * their ip address/id field changed in the same way).
3149 */
3150 /* The icmp_id field is used by the sender to identify the
3151 * process making the icmp request. (the receiver justs
3152 * copies it back in its response). So, it closely matches
3153 * the concept of source port. We overlay sport, so we can
3154 * maximally reuse the existing code.
3155 */
3156 ni.nai_sport = fin->fin_data[1];
3157 ni.nai_dport = 0;
3158 }
3159
3160 bzero((char *)nat, sizeof(*nat));
3161 nat->nat_flags = flags;
3162 nat->nat_redir = np->in_redir;
3163 nat->nat_dir = direction;
3164 nat->nat_pr[0] = fin->fin_p;
3165 nat->nat_pr[1] = fin->fin_p;
3166
3167 /*
3168 * Search the current table for a match and create a new mapping
3169 * if there is none found.
3170 */
3171 if (np->in_redir & NAT_DIVERTUDP) {
3172 move = ipf_nat_newdivert(fin, nat, &ni);
3173
3174 } else if (np->in_redir & NAT_REWRITE) {
3175 move = ipf_nat_newrewrite(fin, nat, &ni);
3176
3177 } else if (direction == NAT_OUTBOUND) {
3178 /*
3179 * We can now arrange to call this for the same connection
3180 * because ipf_nat_new doesn't protect the code path into
3181 * this function.
3182 */
3183 natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p,
3184 fin->fin_src, fin->fin_dst);
3185 if (natl != NULL) {
3186 KFREE(nat);
3187 nat = natl;
3188 goto done;
3189 }
3190
3191 move = ipf_nat_newmap(fin, nat, &ni);
3192 } else {
3193 /*
3194 * NAT_INBOUND is used for redirects rules
3195 */
3196 natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p,
3197 fin->fin_src, fin->fin_dst);
3198 if (natl != NULL) {
3199 KFREE(nat);
3200 nat = natl;
3201 goto done;
3202 }
3203
3204 move = ipf_nat_newrdr(fin, nat, &ni);
3205 }
3206 if (move == -1)
3207 goto badnat;
3208
3209 np = ni.nai_np;
3210
3211 nat->nat_mssclamp = np->in_mssclamp;
3212 nat->nat_me = natsave;
3213 nat->nat_fr = fin->fin_fr;
3214 nat->nat_rev = fin->fin_rev;
3215 nat->nat_ptr = np;
3216 nat->nat_dlocal = np->in_dlocal;
3217
3218 if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) {
3219 if (ipf_proxy_new(fin, nat) == -1) {
3220 NBUMPSIDED(fin->fin_out, ns_appr_fail);
3221 DT3(ns_appr_fail, fr_info_t *, fin, nat_t *, nat, ipnat_t *, np);
3222 goto badnat;
3223 }
3224 }
3225
3226 nat->nat_ifps[0] = np->in_ifps[0];
3227 if (np->in_ifps[0] != NULL) {
3228 COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]);
3229 }
3230
3231 nat->nat_ifps[1] = np->in_ifps[1];
3232 if (np->in_ifps[1] != NULL) {
3233 COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]);
3234 }
3235
3236 if (ipf_nat_finalise(fin, nat) == -1) {
3237 goto badnat;
3238 }
3239
3240 np->in_use++;
3241
3242 if ((move == 1) && (np->in_flags & IPN_ROUNDR)) {
3243 if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) {
3244 ipf_nat_delrdr(softn, np);
3245 ipf_nat_addrdr(softn, np);
3246 } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) {
3247 ipf_nat_delmap(softn, np);
3248 ipf_nat_addmap(softn, np);
3249 }
3250 }
3251
3252 if (flags & SI_WILDP)
3253 nsp->ns_wilds++;
3254 nsp->ns_proto[nat->nat_pr[0]]++;
3255
3256 goto done;
3257 badnat:
3258 DT3(ns_badnatnew, fr_info_t *, fin, nat_t *, nat, ipnat_t *, np);
3259 NBUMPSIDE(fin->fin_out, ns_badnatnew);
3260 if ((hm = nat->nat_hm) != NULL)
3261 ipf_nat_hostmapdel(softc, &hm);
3262 KFREE(nat);
3263 nat = NULL;
3264 done:
3265 if (nat != NULL && np != NULL)
3266 np->in_hits++;
3267 if (natsave != NULL)
3268 *natsave = nat;
3269 return nat;
3270 }
3271
3272
3273 /* ------------------------------------------------------------------------ */
3274 /* Function: ipf_nat_finalise */
3275 /* Returns: int - 0 == sucess, -1 == failure */
3276 /* Parameters: fin(I) - pointer to packet information */
3277 /* nat(I) - pointer to NAT entry */
3278 /* Write Lock: ipf_nat */
3279 /* */
3280 /* This is the tail end of constructing a new NAT entry and is the same */
3281 /* for both IPv4 and IPv6. */
3282 /* ------------------------------------------------------------------------ */
3283 /*ARGSUSED*/
3284 static int
ipf_nat_finalise(fin,nat)3285 ipf_nat_finalise(fin, nat)
3286 fr_info_t *fin;
3287 nat_t *nat;
3288 {
3289 ipf_main_softc_t *softc = fin->fin_main_soft;
3290 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3291 u_32_t sum1, sum2, sumd;
3292 frentry_t *fr;
3293 u_32_t flags;
3294 #if SOLARIS && defined(_KERNEL) && defined(ICK_M_CTL_MAGIC)
3295 qpktinfo_t *qpi = fin->fin_qpi;
3296 #endif
3297
3298 flags = nat->nat_flags;
3299
3300 switch (nat->nat_pr[0])
3301 {
3302 case IPPROTO_ICMP :
3303 sum1 = LONG_SUM(ntohs(nat->nat_oicmpid));
3304 sum2 = LONG_SUM(ntohs(nat->nat_nicmpid));
3305 CALC_SUMD(sum1, sum2, sumd);
3306 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
3307
3308 break;
3309
3310 default :
3311 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \
3312 ntohs(nat->nat_osport));
3313 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \
3314 ntohs(nat->nat_nsport));
3315 CALC_SUMD(sum1, sum2, sumd);
3316 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
3317
3318 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \
3319 ntohs(nat->nat_odport));
3320 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \
3321 ntohs(nat->nat_ndport));
3322 CALC_SUMD(sum1, sum2, sumd);
3323 nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16);
3324 break;
3325 }
3326
3327 /*
3328 * Compute the partial checksum, just in case.
3329 * This is only ever placed into outbound packets so care needs
3330 * to be taken over which pair of addresses are used.
3331 */
3332 if (nat->nat_dir == NAT_OUTBOUND) {
3333 sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
3334 sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr));
3335 } else {
3336 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr));
3337 sum1 += LONG_SUM(ntohl(nat->nat_odstaddr));
3338 }
3339 sum1 += nat->nat_pr[1];
3340 nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16);
3341
3342 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr));
3343 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
3344 CALC_SUMD(sum1, sum2, sumd);
3345 nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16);
3346
3347 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr));
3348 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr));
3349 CALC_SUMD(sum1, sum2, sumd);
3350 nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16);
3351
3352 nat->nat_v[0] = 4;
3353 nat->nat_v[1] = 4;
3354
3355 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) {
3356 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
3357 }
3358
3359 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) {
3360 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
3361 }
3362
3363 if ((nat->nat_flags & SI_CLONE) == 0)
3364 nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat);
3365
3366 if (ipf_nat_insert(softc, softn, nat) == 0) {
3367 if (softn->ipf_nat_logging)
3368 ipf_nat_log(softc, softn, nat, NL_NEW);
3369 fr = nat->nat_fr;
3370 if (fr != NULL) {
3371 MUTEX_ENTER(&fr->fr_lock);
3372 fr->fr_ref++;
3373 MUTEX_EXIT(&fr->fr_lock);
3374 }
3375 return 0;
3376 }
3377
3378 NBUMPSIDED(fin->fin_out, ns_unfinalised);
3379 DT2(ns_unfinalised, fr_info_t *, fin, nat_t *, nat);
3380 /*
3381 * nat_insert failed, so cleanup time...
3382 */
3383 if (nat->nat_sync != NULL)
3384 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync);
3385 return -1;
3386 }
3387
3388
3389 /* ------------------------------------------------------------------------ */
3390 /* Function: ipf_nat_insert */
3391 /* Returns: int - 0 == sucess, -1 == failure */
3392 /* Parameters: softc(I) - pointer to soft context main structure */
3393 /* softn(I) - pointer to NAT context structure */
3394 /* nat(I) - pointer to NAT structure */
3395 /* Write Lock: ipf_nat */
3396 /* */
3397 /* Insert a NAT entry into the hash tables for searching and add it to the */
3398 /* list of active NAT entries. Adjust global counters when complete. */
3399 /* ------------------------------------------------------------------------ */
3400 int
ipf_nat_insert(softc,softn,nat)3401 ipf_nat_insert(softc, softn, nat)
3402 ipf_main_softc_t *softc;
3403 ipf_nat_softc_t *softn;
3404 nat_t *nat;
3405 {
3406 u_int hv0, hv1;
3407 u_int sp, dp;
3408 ipnat_t *in;
3409 int ret;
3410
3411 /*
3412 * Try and return an error as early as possible, so calculate the hash
3413 * entry numbers first and then proceed.
3414 */
3415 if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) {
3416 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
3417 sp = nat->nat_osport;
3418 dp = nat->nat_odport;
3419 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
3420 sp = 0;
3421 dp = nat->nat_oicmpid;
3422 } else {
3423 sp = 0;
3424 dp = 0;
3425 }
3426 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff);
3427 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff);
3428 /*
3429 * TRACE nat_osrcaddr, nat_osport, nat_odstaddr,
3430 * nat_odport, hv0
3431 */
3432
3433 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
3434 sp = nat->nat_nsport;
3435 dp = nat->nat_ndport;
3436 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
3437 sp = 0;
3438 dp = nat->nat_nicmpid;
3439 } else {
3440 sp = 0;
3441 dp = 0;
3442 }
3443 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff);
3444 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff);
3445 /*
3446 * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr,
3447 * nat_ndport, hv1
3448 */
3449 } else {
3450 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff);
3451 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff);
3452 /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */
3453
3454 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff);
3455 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff);
3456 /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */
3457 }
3458
3459 nat->nat_hv[0] = hv0;
3460 nat->nat_hv[1] = hv1;
3461
3462 MUTEX_INIT(&nat->nat_lock, "nat entry lock");
3463
3464 in = nat->nat_ptr;
3465 nat->nat_ref = nat->nat_me ? 2 : 1;
3466
3467 nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0';
3468 nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4);
3469
3470 if (nat->nat_ifnames[1][0] != '\0') {
3471 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0';
3472 nat->nat_ifps[1] = ipf_resolvenic(softc,
3473 nat->nat_ifnames[1], 4);
3474 } else if (in->in_ifnames[1] != -1) {
3475 char *name;
3476
3477 name = in->in_names + in->in_ifnames[1];
3478 if (name[1] != '\0' && name[0] != '-' && name[0] != '*') {
3479 (void) strncpy(nat->nat_ifnames[1],
3480 nat->nat_ifnames[0], LIFNAMSIZ);
3481 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0';
3482 nat->nat_ifps[1] = nat->nat_ifps[0];
3483 }
3484 }
3485 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) {
3486 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
3487 }
3488 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) {
3489 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
3490 }
3491
3492 ret = ipf_nat_hashtab_add(softc, softn, nat);
3493 if (ret == -1)
3494 MUTEX_DESTROY(&nat->nat_lock);
3495 return ret;
3496 }
3497
3498
3499 /* ------------------------------------------------------------------------ */
3500 /* Function: ipf_nat_hashtab_add */
3501 /* Returns: int - 0 == sucess, -1 == failure */
3502 /* Parameters: softc(I) - pointer to soft context main structure */
3503 /* softn(I) - pointer to NAT context structure */
3504 /* nat(I) - pointer to NAT structure */
3505 /* */
3506 /* Handle the insertion of a NAT entry into the table/list. */
3507 /* ------------------------------------------------------------------------ */
3508 int
ipf_nat_hashtab_add(softc,softn,nat)3509 ipf_nat_hashtab_add(softc, softn, nat)
3510 ipf_main_softc_t *softc;
3511 ipf_nat_softc_t *softn;
3512 nat_t *nat;
3513 {
3514 nat_t **natp;
3515 u_int hv0;
3516 u_int hv1;
3517
3518 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz;
3519 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz;
3520
3521 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) {
3522 u_int swap;
3523
3524 swap = hv0;
3525 hv0 = hv1;
3526 hv1 = swap;
3527 }
3528
3529 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >=
3530 softn->ipf_nat_maxbucket) {
3531 DT1(ns_bucket_max_0, int,
3532 softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]);
3533 NBUMPSIDE(0, ns_bucket_max);
3534 return -1;
3535 }
3536
3537 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >=
3538 softn->ipf_nat_maxbucket) {
3539 DT1(ns_bucket_max_1, int,
3540 softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]);
3541 NBUMPSIDE(1, ns_bucket_max);
3542 return -1;
3543 }
3544
3545 /*
3546 * The ordering of operations in the list and hash table insertion
3547 * is very important. The last operation for each task should be
3548 * to update the top of the list, after all the "nexts" have been
3549 * done so that walking the list while it is being done does not
3550 * find strange pointers.
3551 *
3552 * Global list of NAT instances
3553 */
3554 nat->nat_next = softn->ipf_nat_instances;
3555 nat->nat_pnext = &softn->ipf_nat_instances;
3556 if (softn->ipf_nat_instances)
3557 softn->ipf_nat_instances->nat_pnext = &nat->nat_next;
3558 softn->ipf_nat_instances = nat;
3559
3560 /*
3561 * Inbound hash table.
3562 */
3563 natp = &softn->ipf_nat_table[0][hv0];
3564 nat->nat_phnext[0] = natp;
3565 nat->nat_hnext[0] = *natp;
3566 if (*natp) {
3567 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
3568 } else {
3569 NBUMPSIDE(0, ns_inuse);
3570 }
3571 *natp = nat;
3572 NBUMPSIDE(0, ns_bucketlen[hv0]);
3573
3574 /*
3575 * Outbound hash table.
3576 */
3577 natp = &softn->ipf_nat_table[1][hv1];
3578 nat->nat_phnext[1] = natp;
3579 nat->nat_hnext[1] = *natp;
3580 if (*natp)
3581 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
3582 else {
3583 NBUMPSIDE(1, ns_inuse);
3584 }
3585 *natp = nat;
3586 NBUMPSIDE(1, ns_bucketlen[hv1]);
3587
3588 ipf_nat_setqueue(softc, softn, nat);
3589
3590 if (nat->nat_dir & NAT_OUTBOUND) {
3591 NBUMPSIDE(1, ns_added);
3592 } else {
3593 NBUMPSIDE(0, ns_added);
3594 }
3595 softn->ipf_nat_stats.ns_active++;
3596 return 0;
3597 }
3598
3599
3600 /* ------------------------------------------------------------------------ */
3601 /* Function: ipf_nat_icmperrorlookup */
3602 /* Returns: nat_t* - point to matching NAT structure */
3603 /* Parameters: fin(I) - pointer to packet information */
3604 /* dir(I) - direction of packet (in/out) */
3605 /* */
3606 /* Check if the ICMP error message is related to an existing TCP, UDP or */
3607 /* ICMP query nat entry. It is assumed that the packet is already of the */
3608 /* the required length. */
3609 /* ------------------------------------------------------------------------ */
3610 nat_t *
ipf_nat_icmperrorlookup(fin,dir)3611 ipf_nat_icmperrorlookup(fin, dir)
3612 fr_info_t *fin;
3613 int dir;
3614 {
3615 ipf_main_softc_t *softc = fin->fin_main_soft;
3616 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3617 int flags = 0, type, minlen;
3618 icmphdr_t *icmp, *orgicmp;
3619 nat_stat_side_t *nside;
3620 tcphdr_t *tcp = NULL;
3621 u_short data[2];
3622 nat_t *nat;
3623 ip_t *oip;
3624 u_int p;
3625
3626 icmp = fin->fin_dp;
3627 type = icmp->icmp_type;
3628 nside = &softn->ipf_nat_stats.ns_side[fin->fin_out];
3629 /*
3630 * Does it at least have the return (basic) IP header ?
3631 * Only a basic IP header (no options) should be with an ICMP error
3632 * header. Also, if it's not an error type, then return.
3633 */
3634 if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) {
3635 ATOMIC_INCL(nside->ns_icmp_basic);
3636 return NULL;
3637 }
3638
3639 /*
3640 * Check packet size
3641 */
3642 oip = (ip_t *)((char *)fin->fin_dp + 8);
3643 minlen = IP_HL(oip) << 2;
3644 if ((minlen < sizeof(ip_t)) ||
3645 (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) {
3646 ATOMIC_INCL(nside->ns_icmp_size);
3647 return NULL;
3648 }
3649
3650 /*
3651 * Is the buffer big enough for all of it ? It's the size of the IP
3652 * header claimed in the encapsulated part which is of concern. It
3653 * may be too big to be in this buffer but not so big that it's
3654 * outside the ICMP packet, leading to TCP deref's causing problems.
3655 * This is possible because we don't know how big oip_hl is when we
3656 * do the pullup early in ipf_check() and thus can't gaurantee it is
3657 * all here now.
3658 */
3659 #ifdef ipf_nat_KERNEL
3660 {
3661 mb_t *m;
3662
3663 m = fin->fin_m;
3664 # if SOLARIS
3665 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN >
3666 (char *)m->b_wptr) {
3667 ATOMIC_INCL(nside->ns_icmp_mbuf);
3668 return NULL;
3669 }
3670 # else
3671 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN >
3672 (char *)fin->fin_ip + M_LEN(m)) {
3673 ATOMIC_INCL(nside->ns_icmp_mbuf);
3674 return NULL;
3675 }
3676 # endif
3677 }
3678 #endif
3679
3680 if (fin->fin_daddr != oip->ip_src.s_addr) {
3681 ATOMIC_INCL(nside->ns_icmp_address);
3682 return NULL;
3683 }
3684
3685 p = oip->ip_p;
3686 if (p == IPPROTO_TCP)
3687 flags = IPN_TCP;
3688 else if (p == IPPROTO_UDP)
3689 flags = IPN_UDP;
3690 else if (p == IPPROTO_ICMP) {
3691 orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2));
3692
3693 /* see if this is related to an ICMP query */
3694 if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) {
3695 data[0] = fin->fin_data[0];
3696 data[1] = fin->fin_data[1];
3697 fin->fin_data[0] = 0;
3698 fin->fin_data[1] = orgicmp->icmp_id;
3699
3700 flags = IPN_ICMPERR|IPN_ICMPQUERY;
3701 /*
3702 * NOTE : dir refers to the direction of the original
3703 * ip packet. By definition the icmp error
3704 * message flows in the opposite direction.
3705 */
3706 if (dir == NAT_INBOUND)
3707 nat = ipf_nat_inlookup(fin, flags, p,
3708 oip->ip_dst,
3709 oip->ip_src);
3710 else
3711 nat = ipf_nat_outlookup(fin, flags, p,
3712 oip->ip_dst,
3713 oip->ip_src);
3714 fin->fin_data[0] = data[0];
3715 fin->fin_data[1] = data[1];
3716 return nat;
3717 }
3718 }
3719
3720 if (flags & IPN_TCPUDP) {
3721 minlen += 8; /* + 64bits of data to get ports */
3722 /* TRACE (fin,minlen) */
3723 if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) {
3724 ATOMIC_INCL(nside->ns_icmp_short);
3725 return NULL;
3726 }
3727
3728 data[0] = fin->fin_data[0];
3729 data[1] = fin->fin_data[1];
3730 tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2));
3731 fin->fin_data[0] = ntohs(tcp->th_dport);
3732 fin->fin_data[1] = ntohs(tcp->th_sport);
3733
3734 if (dir == NAT_INBOUND) {
3735 nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst,
3736 oip->ip_src);
3737 } else {
3738 nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst,
3739 oip->ip_src);
3740 }
3741 fin->fin_data[0] = data[0];
3742 fin->fin_data[1] = data[1];
3743 return nat;
3744 }
3745 if (dir == NAT_INBOUND)
3746 nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src);
3747 else
3748 nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src);
3749
3750 return nat;
3751 }
3752
3753
3754 /* ------------------------------------------------------------------------ */
3755 /* Function: ipf_nat_icmperror */
3756 /* Returns: nat_t* - point to matching NAT structure */
3757 /* Parameters: fin(I) - pointer to packet information */
3758 /* nflags(I) - NAT flags for this packet */
3759 /* dir(I) - direction of packet (in/out) */
3760 /* */
3761 /* Fix up an ICMP packet which is an error message for an existing NAT */
3762 /* session. This will correct both packet header data and checksums. */
3763 /* */
3764 /* This should *ONLY* be used for incoming ICMP error packets to make sure */
3765 /* a NAT'd ICMP packet gets correctly recognised. */
3766 /* ------------------------------------------------------------------------ */
3767 nat_t *
ipf_nat_icmperror(fin,nflags,dir)3768 ipf_nat_icmperror(fin, nflags, dir)
3769 fr_info_t *fin;
3770 u_int *nflags;
3771 int dir;
3772 {
3773 ipf_main_softc_t *softc = fin->fin_main_soft;
3774 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
3775 u_32_t sum1, sum2, sumd, sumd2;
3776 struct in_addr a1, a2, a3, a4;
3777 int flags, dlen, odst;
3778 icmphdr_t *icmp;
3779 u_short *csump;
3780 tcphdr_t *tcp;
3781 nat_t *nat;
3782 ip_t *oip;
3783 void *dp;
3784
3785 if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) {
3786 NBUMPSIDED(fin->fin_out, ns_icmp_short);
3787 return NULL;
3788 }
3789
3790 /*
3791 * ipf_nat_icmperrorlookup() will return NULL for `defective' packets.
3792 */
3793 if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) {
3794 NBUMPSIDED(fin->fin_out, ns_icmp_notfound);
3795 return NULL;
3796 }
3797
3798 tcp = NULL;
3799 csump = NULL;
3800 flags = 0;
3801 sumd2 = 0;
3802 *nflags = IPN_ICMPERR;
3803 icmp = fin->fin_dp;
3804 oip = (ip_t *)&icmp->icmp_ip;
3805 dp = (((char *)oip) + (IP_HL(oip) << 2));
3806 if (oip->ip_p == IPPROTO_TCP) {
3807 tcp = (tcphdr_t *)dp;
3808 csump = (u_short *)&tcp->th_sum;
3809 flags = IPN_TCP;
3810 } else if (oip->ip_p == IPPROTO_UDP) {
3811 udphdr_t *udp;
3812
3813 udp = (udphdr_t *)dp;
3814 tcp = (tcphdr_t *)dp;
3815 csump = (u_short *)&udp->uh_sum;
3816 flags = IPN_UDP;
3817 } else if (oip->ip_p == IPPROTO_ICMP)
3818 flags = IPN_ICMPQUERY;
3819 dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip);
3820
3821 /*
3822 * Need to adjust ICMP header to include the real IP#'s and
3823 * port #'s. Only apply a checksum change relative to the
3824 * IP address change as it will be modified again in ipf_nat_checkout
3825 * for both address and port. Two checksum changes are
3826 * necessary for the two header address changes. Be careful
3827 * to only modify the checksum once for the port # and twice
3828 * for the IP#.
3829 */
3830
3831 /*
3832 * Step 1
3833 * Fix the IP addresses in the offending IP packet. You also need
3834 * to adjust the IP header checksum of that offending IP packet.
3835 *
3836 * Normally, you would expect that the ICMP checksum of the
3837 * ICMP error message needs to be adjusted as well for the
3838 * IP address change in oip.
3839 * However, this is a NOP, because the ICMP checksum is
3840 * calculated over the complete ICMP packet, which includes the
3841 * changed oip IP addresses and oip->ip_sum. However, these
3842 * two changes cancel each other out (if the delta for
3843 * the IP address is x, then the delta for ip_sum is minus x),
3844 * so no change in the icmp_cksum is necessary.
3845 *
3846 * Inbound ICMP
3847 * ------------
3848 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b
3849 * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b)
3850 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip
3851 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip
3852 *
3853 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c
3854 * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3855 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3856 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3857 *
3858 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d
3859 * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d)
3860 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip
3861 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip
3862 *
3863 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d
3864 * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3865 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3866 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3867 *
3868 * Outbound ICMP
3869 * -------------
3870 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b
3871 * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a)
3872 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip
3873 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3874 *
3875 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c
3876 * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c)
3877 * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip
3878 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip
3879 *
3880 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d
3881 * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d)
3882 * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip
3883 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip
3884 *
3885 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d
3886 * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a)
3887 * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip
3888 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip
3889 */
3890
3891 if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) ||
3892 ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) {
3893 a1.s_addr = ntohl(nat->nat_osrcaddr);
3894 a4.s_addr = ntohl(oip->ip_src.s_addr);
3895 a3.s_addr = ntohl(nat->nat_odstaddr);
3896 a2.s_addr = ntohl(oip->ip_dst.s_addr);
3897 oip->ip_src.s_addr = htonl(a1.s_addr);
3898 oip->ip_dst.s_addr = htonl(a3.s_addr);
3899 odst = 1;
3900 } else {
3901 a1.s_addr = ntohl(nat->nat_ndstaddr);
3902 a2.s_addr = ntohl(oip->ip_dst.s_addr);
3903 a3.s_addr = ntohl(nat->nat_nsrcaddr);
3904 a4.s_addr = ntohl(oip->ip_src.s_addr);
3905 oip->ip_dst.s_addr = htonl(a3.s_addr);
3906 oip->ip_src.s_addr = htonl(a1.s_addr);
3907 odst = 0;
3908 }
3909 sum1 = 0;
3910 sum2 = 0;
3911 sumd = 0;
3912 CALC_SUMD(a2.s_addr, a3.s_addr, sum1);
3913 CALC_SUMD(a4.s_addr, a1.s_addr, sum2);
3914 sumd = sum2 + sum1;
3915 if (sumd != 0)
3916 ipf_fix_datacksum(&oip->ip_sum, sumd);
3917
3918 sumd2 = sumd;
3919 sum1 = 0;
3920 sum2 = 0;
3921
3922 /*
3923 * Fix UDP pseudo header checksum to compensate for the
3924 * IP address change.
3925 */
3926 if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) {
3927 u_32_t sum3, sum4, sumt;
3928
3929 /*
3930 * Step 2 :
3931 * For offending TCP/UDP IP packets, translate the ports as
3932 * well, based on the NAT specification. Of course such
3933 * a change may be reflected in the ICMP checksum as well.
3934 *
3935 * Since the port fields are part of the TCP/UDP checksum
3936 * of the offending IP packet, you need to adjust that checksum
3937 * as well... except that the change in the port numbers should
3938 * be offset by the checksum change. However, the TCP/UDP
3939 * checksum will also need to change if there has been an
3940 * IP address change.
3941 */
3942 if (odst == 1) {
3943 sum1 = ntohs(nat->nat_osport);
3944 sum4 = ntohs(tcp->th_sport);
3945 sum3 = ntohs(nat->nat_odport);
3946 sum2 = ntohs(tcp->th_dport);
3947
3948 tcp->th_sport = htons(sum1);
3949 tcp->th_dport = htons(sum3);
3950 } else {
3951 sum1 = ntohs(nat->nat_ndport);
3952 sum2 = ntohs(tcp->th_dport);
3953 sum3 = ntohs(nat->nat_nsport);
3954 sum4 = ntohs(tcp->th_sport);
3955
3956 tcp->th_dport = htons(sum3);
3957 tcp->th_sport = htons(sum1);
3958 }
3959 CALC_SUMD(sum4, sum1, sumt);
3960 sumd += sumt;
3961 CALC_SUMD(sum2, sum3, sumt);
3962 sumd += sumt;
3963
3964 if (sumd != 0 || sumd2 != 0) {
3965 /*
3966 * At this point, sumd is the delta to apply to the
3967 * TCP/UDP header, given the changes in both the IP
3968 * address and the ports and sumd2 is the delta to
3969 * apply to the ICMP header, given the IP address
3970 * change delta that may need to be applied to the
3971 * TCP/UDP checksum instead.
3972 *
3973 * If we will both the IP and TCP/UDP checksums
3974 * then the ICMP checksum changes by the address
3975 * delta applied to the TCP/UDP checksum. If we
3976 * do not change the TCP/UDP checksum them we
3977 * apply the delta in ports to the ICMP checksum.
3978 */
3979 if (oip->ip_p == IPPROTO_UDP) {
3980 if ((dlen >= 8) && (*csump != 0)) {
3981 ipf_fix_datacksum(csump, sumd);
3982 } else {
3983 CALC_SUMD(sum1, sum4, sumd2);
3984 CALC_SUMD(sum3, sum2, sumt);
3985 sumd2 += sumt;
3986 }
3987 } else if (oip->ip_p == IPPROTO_TCP) {
3988 if (dlen >= 18) {
3989 ipf_fix_datacksum(csump, sumd);
3990 } else {
3991 CALC_SUMD(sum1, sum4, sumd2);
3992 CALC_SUMD(sum3, sum2, sumt);
3993 sumd2 += sumt;
3994 }
3995 }
3996 if (sumd2 != 0) {
3997 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
3998 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
3999 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16);
4000 ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0);
4001 }
4002 }
4003 } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) {
4004 icmphdr_t *orgicmp;
4005
4006 /*
4007 * XXX - what if this is bogus hl and we go off the end ?
4008 * In this case, ipf_nat_icmperrorlookup() will have
4009 * returned NULL.
4010 */
4011 orgicmp = (icmphdr_t *)dp;
4012
4013 if (odst == 1) {
4014 if (orgicmp->icmp_id != nat->nat_osport) {
4015
4016 /*
4017 * Fix ICMP checksum (of the offening ICMP
4018 * query packet) to compensate the change
4019 * in the ICMP id of the offending ICMP
4020 * packet.
4021 *
4022 * Since you modify orgicmp->icmp_id with
4023 * a delta (say x) and you compensate that
4024 * in origicmp->icmp_cksum with a delta
4025 * minus x, you don't have to adjust the
4026 * overall icmp->icmp_cksum
4027 */
4028 sum1 = ntohs(orgicmp->icmp_id);
4029 sum2 = ntohs(nat->nat_oicmpid);
4030 CALC_SUMD(sum1, sum2, sumd);
4031 orgicmp->icmp_id = nat->nat_oicmpid;
4032 ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd);
4033 }
4034 } /* nat_dir == NAT_INBOUND is impossible for icmp queries */
4035 }
4036 return nat;
4037 }
4038
4039
4040 /*
4041 * MAP-IN MAP-OUT RDR-IN RDR-OUT
4042 * osrc X == src == src X
4043 * odst X == dst == dst X
4044 * nsrc == dst X X == dst
4045 * ndst == src X X == src
4046 * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND
4047 */
4048 /*
4049 * NB: these lookups don't lock access to the list, it assumed that it has
4050 * already been done!
4051 */
4052 /* ------------------------------------------------------------------------ */
4053 /* Function: ipf_nat_inlookup */
4054 /* Returns: nat_t* - NULL == no match, */
4055 /* else pointer to matching NAT entry */
4056 /* Parameters: fin(I) - pointer to packet information */
4057 /* flags(I) - NAT flags for this packet */
4058 /* p(I) - protocol for this packet */
4059 /* src(I) - source IP address */
4060 /* mapdst(I) - destination IP address */
4061 /* */
4062 /* Lookup a nat entry based on the mapped destination ip address/port and */
4063 /* real source address/port. We use this lookup when receiving a packet, */
4064 /* we're looking for a table entry, based on the destination address. */
4065 /* */
4066 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */
4067 /* */
4068 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */
4069 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */
4070 /* */
4071 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */
4072 /* the packet is of said protocol */
4073 /* ------------------------------------------------------------------------ */
4074 nat_t *
ipf_nat_inlookup(fin,flags,p,src,mapdst)4075 ipf_nat_inlookup(fin, flags, p, src, mapdst)
4076 fr_info_t *fin;
4077 u_int flags, p;
4078 struct in_addr src , mapdst;
4079 {
4080 ipf_main_softc_t *softc = fin->fin_main_soft;
4081 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4082 u_short sport, dport;
4083 grehdr_t *gre;
4084 ipnat_t *ipn;
4085 u_int sflags;
4086 nat_t *nat;
4087 int nflags;
4088 u_32_t dst;
4089 void *ifp;
4090 u_int hv, rhv;
4091
4092 ifp = fin->fin_ifp;
4093 gre = NULL;
4094 dst = mapdst.s_addr;
4095 sflags = flags & NAT_TCPUDPICMP;
4096
4097 switch (p)
4098 {
4099 case IPPROTO_TCP :
4100 case IPPROTO_UDP :
4101 sport = htons(fin->fin_data[0]);
4102 dport = htons(fin->fin_data[1]);
4103 break;
4104 case IPPROTO_ICMP :
4105 sport = 0;
4106 dport = fin->fin_data[1];
4107 break;
4108 default :
4109 sport = 0;
4110 dport = 0;
4111 break;
4112 }
4113
4114
4115 if ((flags & SI_WILDP) != 0)
4116 goto find_in_wild_ports;
4117
4118 rhv = NAT_HASH_FN(dst, dport, 0xffffffff);
4119 rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff);
4120 hv = rhv % softn->ipf_nat_table_sz;
4121 nat = softn->ipf_nat_table[1][hv];
4122 /* TRACE dst, dport, src, sport, hv, nat */
4123
4124 for (; nat; nat = nat->nat_hnext[1]) {
4125 if (nat->nat_ifps[0] != NULL) {
4126 if ((ifp != NULL) && (ifp != nat->nat_ifps[0]))
4127 continue;
4128 }
4129
4130 if (nat->nat_pr[0] != p)
4131 continue;
4132
4133 switch (nat->nat_dir)
4134 {
4135 case NAT_INBOUND :
4136 case NAT_DIVERTIN :
4137 if (nat->nat_v[0] != 4)
4138 continue;
4139 if (nat->nat_osrcaddr != src.s_addr ||
4140 nat->nat_odstaddr != dst)
4141 continue;
4142 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4143 if (nat->nat_osport != sport)
4144 continue;
4145 if (nat->nat_odport != dport)
4146 continue;
4147
4148 } else if (p == IPPROTO_ICMP) {
4149 if (nat->nat_osport != dport) {
4150 continue;
4151 }
4152 }
4153 break;
4154 case NAT_DIVERTOUT :
4155 if (nat->nat_dlocal)
4156 continue;
4157 case NAT_OUTBOUND :
4158 if (nat->nat_v[1] != 4)
4159 continue;
4160 if (nat->nat_dlocal)
4161 continue;
4162 if (nat->nat_dlocal)
4163 continue;
4164 if (nat->nat_ndstaddr != src.s_addr ||
4165 nat->nat_nsrcaddr != dst)
4166 continue;
4167 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4168 if (nat->nat_ndport != sport)
4169 continue;
4170 if (nat->nat_nsport != dport)
4171 continue;
4172
4173 } else if (p == IPPROTO_ICMP) {
4174 if (nat->nat_osport != dport) {
4175 continue;
4176 }
4177 }
4178 break;
4179 }
4180
4181
4182 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4183 ipn = nat->nat_ptr;
4184 if ((ipn != NULL) && (nat->nat_aps != NULL))
4185 if (ipf_proxy_match(fin, nat) != 0)
4186 continue;
4187 }
4188 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) {
4189 nat->nat_ifps[0] = ifp;
4190 nat->nat_mtu[0] = GETIFMTU_4(ifp);
4191 }
4192 return nat;
4193 }
4194
4195 /*
4196 * So if we didn't find it but there are wildcard members in the hash
4197 * table, go back and look for them. We do this search and update here
4198 * because it is modifying the NAT table and we want to do this only
4199 * for the first packet that matches. The exception, of course, is
4200 * for "dummy" (FI_IGNORE) lookups.
4201 */
4202 find_in_wild_ports:
4203 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) {
4204 NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0);
4205 return NULL;
4206 }
4207 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) {
4208 NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0);
4209 return NULL;
4210 }
4211
4212 RWLOCK_EXIT(&softc->ipf_nat);
4213
4214 hv = NAT_HASH_FN(dst, 0, 0xffffffff);
4215 hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz);
4216 WRITE_ENTER(&softc->ipf_nat);
4217
4218 nat = softn->ipf_nat_table[1][hv];
4219 /* TRACE dst, src, hv, nat */
4220 for (; nat; nat = nat->nat_hnext[1]) {
4221 if (nat->nat_ifps[0] != NULL) {
4222 if ((ifp != NULL) && (ifp != nat->nat_ifps[0]))
4223 continue;
4224 }
4225
4226 if (nat->nat_pr[0] != fin->fin_p)
4227 continue;
4228
4229 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))
4230 {
4231 case NAT_INBOUND :
4232 if (nat->nat_v[0] != 4)
4233 continue;
4234 if (nat->nat_osrcaddr != src.s_addr ||
4235 nat->nat_odstaddr != dst)
4236 continue;
4237 break;
4238 case NAT_OUTBOUND :
4239 if (nat->nat_v[1] != 4)
4240 continue;
4241 if (nat->nat_ndstaddr != src.s_addr ||
4242 nat->nat_nsrcaddr != dst)
4243 continue;
4244 break;
4245 }
4246
4247 nflags = nat->nat_flags;
4248 if (!(nflags & (NAT_TCPUDP|SI_WILDP)))
4249 continue;
4250
4251 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags,
4252 NAT_INBOUND) == 1) {
4253 if ((fin->fin_flx & FI_IGNORE) != 0)
4254 break;
4255 if ((nflags & SI_CLONE) != 0) {
4256 nat = ipf_nat_clone(fin, nat);
4257 if (nat == NULL)
4258 break;
4259 } else {
4260 MUTEX_ENTER(&softn->ipf_nat_new);
4261 softn->ipf_nat_stats.ns_wilds--;
4262 MUTEX_EXIT(&softn->ipf_nat_new);
4263 }
4264
4265 if (nat->nat_dir == NAT_INBOUND) {
4266 if (nat->nat_osport == 0) {
4267 nat->nat_osport = sport;
4268 nat->nat_nsport = sport;
4269 }
4270 if (nat->nat_odport == 0) {
4271 nat->nat_odport = dport;
4272 nat->nat_ndport = dport;
4273 }
4274 } else if (nat->nat_dir == NAT_OUTBOUND) {
4275 if (nat->nat_osport == 0) {
4276 nat->nat_osport = dport;
4277 nat->nat_nsport = dport;
4278 }
4279 if (nat->nat_odport == 0) {
4280 nat->nat_odport = sport;
4281 nat->nat_ndport = sport;
4282 }
4283 }
4284 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) {
4285 nat->nat_ifps[0] = ifp;
4286 nat->nat_mtu[0] = GETIFMTU_4(ifp);
4287 }
4288 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT);
4289 ipf_nat_tabmove(softn, nat);
4290 break;
4291 }
4292 }
4293
4294 MUTEX_DOWNGRADE(&softc->ipf_nat);
4295
4296 if (nat == NULL) {
4297 NBUMPSIDE(0, ns_lookup_miss);
4298 }
4299 return nat;
4300 }
4301
4302
4303 /* ------------------------------------------------------------------------ */
4304 /* Function: ipf_nat_tabmove */
4305 /* Returns: Nil */
4306 /* Parameters: softn(I) - pointer to NAT context structure */
4307 /* nat(I) - pointer to NAT structure */
4308 /* Write Lock: ipf_nat */
4309 /* */
4310 /* This function is only called for TCP/UDP NAT table entries where the */
4311 /* original was placed in the table without hashing on the ports and we now */
4312 /* want to include hashing on port numbers. */
4313 /* ------------------------------------------------------------------------ */
4314 static void
ipf_nat_tabmove(softn,nat)4315 ipf_nat_tabmove(softn, nat)
4316 ipf_nat_softc_t *softn;
4317 nat_t *nat;
4318 {
4319 u_int hv0, hv1, rhv0, rhv1;
4320 natstat_t *nsp;
4321 nat_t **natp;
4322
4323 if (nat->nat_flags & SI_CLONE)
4324 return;
4325
4326 nsp = &softn->ipf_nat_stats;
4327 /*
4328 * Remove the NAT entry from the old location
4329 */
4330 if (nat->nat_hnext[0])
4331 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0];
4332 *nat->nat_phnext[0] = nat->nat_hnext[0];
4333 nsp->ns_side[0].ns_bucketlen[nat->nat_hv[0] %
4334 softn->ipf_nat_table_sz]--;
4335
4336 if (nat->nat_hnext[1])
4337 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1];
4338 *nat->nat_phnext[1] = nat->nat_hnext[1];
4339 nsp->ns_side[1].ns_bucketlen[nat->nat_hv[1] %
4340 softn->ipf_nat_table_sz]--;
4341
4342 /*
4343 * Add into the NAT table in the new position
4344 */
4345 rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff);
4346 rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport,
4347 0xffffffff);
4348 rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff);
4349 rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport,
4350 0xffffffff);
4351
4352 hv0 = rhv0 % softn->ipf_nat_table_sz;
4353 hv1 = rhv1 % softn->ipf_nat_table_sz;
4354
4355 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) {
4356 u_int swap;
4357
4358 swap = hv0;
4359 hv0 = hv1;
4360 hv1 = swap;
4361 }
4362
4363 /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */
4364 /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */
4365
4366 nat->nat_hv[0] = rhv0;
4367 natp = &softn->ipf_nat_table[0][hv0];
4368 if (*natp)
4369 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
4370 nat->nat_phnext[0] = natp;
4371 nat->nat_hnext[0] = *natp;
4372 *natp = nat;
4373 nsp->ns_side[0].ns_bucketlen[hv0]++;
4374
4375 nat->nat_hv[1] = rhv1;
4376 natp = &softn->ipf_nat_table[1][hv1];
4377 if (*natp)
4378 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
4379 nat->nat_phnext[1] = natp;
4380 nat->nat_hnext[1] = *natp;
4381 *natp = nat;
4382 nsp->ns_side[1].ns_bucketlen[hv1]++;
4383 }
4384
4385
4386 /* ------------------------------------------------------------------------ */
4387 /* Function: ipf_nat_outlookup */
4388 /* Returns: nat_t* - NULL == no match, */
4389 /* else pointer to matching NAT entry */
4390 /* Parameters: fin(I) - pointer to packet information */
4391 /* flags(I) - NAT flags for this packet */
4392 /* p(I) - protocol for this packet */
4393 /* src(I) - source IP address */
4394 /* dst(I) - destination IP address */
4395 /* rw(I) - 1 == write lock on held, 0 == read lock. */
4396 /* */
4397 /* Lookup a nat entry based on the source 'real' ip address/port and */
4398 /* destination address/port. We use this lookup when sending a packet out, */
4399 /* we're looking for a table entry, based on the source address. */
4400 /* */
4401 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */
4402 /* */
4403 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */
4404 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */
4405 /* */
4406 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */
4407 /* the packet is of said protocol */
4408 /* ------------------------------------------------------------------------ */
4409 nat_t *
ipf_nat_outlookup(fin,flags,p,src,dst)4410 ipf_nat_outlookup(fin, flags, p, src, dst)
4411 fr_info_t *fin;
4412 u_int flags, p;
4413 struct in_addr src , dst;
4414 {
4415 ipf_main_softc_t *softc = fin->fin_main_soft;
4416 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4417 u_short sport, dport;
4418 u_int sflags;
4419 ipnat_t *ipn;
4420 nat_t *nat;
4421 void *ifp;
4422 u_int hv;
4423
4424 ifp = fin->fin_ifp;
4425 sflags = flags & IPN_TCPUDPICMP;
4426
4427 switch (p)
4428 {
4429 case IPPROTO_TCP :
4430 case IPPROTO_UDP :
4431 sport = htons(fin->fin_data[0]);
4432 dport = htons(fin->fin_data[1]);
4433 break;
4434 case IPPROTO_ICMP :
4435 sport = 0;
4436 dport = fin->fin_data[1];
4437 break;
4438 default :
4439 sport = 0;
4440 dport = 0;
4441 break;
4442 }
4443
4444 if ((flags & SI_WILDP) != 0)
4445 goto find_out_wild_ports;
4446
4447 hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff);
4448 hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz);
4449 nat = softn->ipf_nat_table[0][hv];
4450
4451 /* TRACE src, sport, dst, dport, hv, nat */
4452
4453 for (; nat; nat = nat->nat_hnext[0]) {
4454 if (nat->nat_ifps[1] != NULL) {
4455 if ((ifp != NULL) && (ifp != nat->nat_ifps[1]))
4456 continue;
4457 }
4458
4459 if (nat->nat_pr[1] != p)
4460 continue;
4461
4462 switch (nat->nat_dir)
4463 {
4464 case NAT_INBOUND :
4465 case NAT_DIVERTIN :
4466 if (nat->nat_v[1] != 4)
4467 continue;
4468 if (nat->nat_ndstaddr != src.s_addr ||
4469 nat->nat_nsrcaddr != dst.s_addr)
4470 continue;
4471
4472 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4473 if (nat->nat_ndport != sport)
4474 continue;
4475 if (nat->nat_nsport != dport)
4476 continue;
4477
4478 } else if (p == IPPROTO_ICMP) {
4479 if (nat->nat_osport != dport) {
4480 continue;
4481 }
4482 }
4483 break;
4484 case NAT_OUTBOUND :
4485 case NAT_DIVERTOUT :
4486 if (nat->nat_v[0] != 4)
4487 continue;
4488 if (nat->nat_osrcaddr != src.s_addr ||
4489 nat->nat_odstaddr != dst.s_addr)
4490 continue;
4491
4492 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
4493 if (nat->nat_odport != dport)
4494 continue;
4495 if (nat->nat_osport != sport)
4496 continue;
4497
4498 } else if (p == IPPROTO_ICMP) {
4499 if (nat->nat_osport != dport) {
4500 continue;
4501 }
4502 }
4503 break;
4504 }
4505
4506 ipn = nat->nat_ptr;
4507 if ((ipn != NULL) && (nat->nat_aps != NULL))
4508 if (ipf_proxy_match(fin, nat) != 0)
4509 continue;
4510
4511 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) {
4512 nat->nat_ifps[1] = ifp;
4513 nat->nat_mtu[1] = GETIFMTU_4(ifp);
4514 }
4515 return nat;
4516 }
4517
4518 /*
4519 * So if we didn't find it but there are wildcard members in the hash
4520 * table, go back and look for them. We do this search and update here
4521 * because it is modifying the NAT table and we want to do this only
4522 * for the first packet that matches. The exception, of course, is
4523 * for "dummy" (FI_IGNORE) lookups.
4524 */
4525 find_out_wild_ports:
4526 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) {
4527 NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1);
4528 return NULL;
4529 }
4530 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) {
4531 NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1);
4532 return NULL;
4533 }
4534
4535 RWLOCK_EXIT(&softc->ipf_nat);
4536
4537 hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff);
4538 hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz);
4539
4540 WRITE_ENTER(&softc->ipf_nat);
4541
4542 nat = softn->ipf_nat_table[0][hv];
4543 for (; nat; nat = nat->nat_hnext[0]) {
4544 if (nat->nat_ifps[1] != NULL) {
4545 if ((ifp != NULL) && (ifp != nat->nat_ifps[1]))
4546 continue;
4547 }
4548
4549 if (nat->nat_pr[1] != fin->fin_p)
4550 continue;
4551
4552 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))
4553 {
4554 case NAT_INBOUND :
4555 if (nat->nat_v[1] != 4)
4556 continue;
4557 if (nat->nat_ndstaddr != src.s_addr ||
4558 nat->nat_nsrcaddr != dst.s_addr)
4559 continue;
4560 break;
4561 case NAT_OUTBOUND :
4562 if (nat->nat_v[0] != 4)
4563 continue;
4564 if (nat->nat_osrcaddr != src.s_addr ||
4565 nat->nat_odstaddr != dst.s_addr)
4566 continue;
4567 break;
4568 }
4569
4570 if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP)))
4571 continue;
4572
4573 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags,
4574 NAT_OUTBOUND) == 1) {
4575 if ((fin->fin_flx & FI_IGNORE) != 0)
4576 break;
4577 if ((nat->nat_flags & SI_CLONE) != 0) {
4578 nat = ipf_nat_clone(fin, nat);
4579 if (nat == NULL)
4580 break;
4581 } else {
4582 MUTEX_ENTER(&softn->ipf_nat_new);
4583 softn->ipf_nat_stats.ns_wilds--;
4584 MUTEX_EXIT(&softn->ipf_nat_new);
4585 }
4586
4587 if (nat->nat_dir == NAT_OUTBOUND) {
4588 if (nat->nat_osport == 0) {
4589 nat->nat_osport = sport;
4590 nat->nat_nsport = sport;
4591 }
4592 if (nat->nat_odport == 0) {
4593 nat->nat_odport = dport;
4594 nat->nat_ndport = dport;
4595 }
4596 } else if (nat->nat_dir == NAT_INBOUND) {
4597 if (nat->nat_osport == 0) {
4598 nat->nat_osport = dport;
4599 nat->nat_nsport = dport;
4600 }
4601 if (nat->nat_odport == 0) {
4602 nat->nat_odport = sport;
4603 nat->nat_ndport = sport;
4604 }
4605 }
4606 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) {
4607 nat->nat_ifps[1] = ifp;
4608 nat->nat_mtu[1] = GETIFMTU_4(ifp);
4609 }
4610 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT);
4611 ipf_nat_tabmove(softn, nat);
4612 break;
4613 }
4614 }
4615
4616 MUTEX_DOWNGRADE(&softc->ipf_nat);
4617
4618 if (nat == NULL) {
4619 NBUMPSIDE(1, ns_lookup_miss);
4620 }
4621 return nat;
4622 }
4623
4624
4625 /* ------------------------------------------------------------------------ */
4626 /* Function: ipf_nat_lookupredir */
4627 /* Returns: nat_t* - NULL == no match, */
4628 /* else pointer to matching NAT entry */
4629 /* Parameters: np(I) - pointer to description of packet to find NAT table */
4630 /* entry for. */
4631 /* */
4632 /* Lookup the NAT tables to search for a matching redirect */
4633 /* The contents of natlookup_t should imitate those found in a packet that */
4634 /* would be translated - ie a packet coming in for RDR or going out for MAP.*/
4635 /* We can do the lookup in one of two ways, imitating an inbound or */
4636 /* outbound packet. By default we assume outbound, unless IPN_IN is set. */
4637 /* For IN, the fields are set as follows: */
4638 /* nl_real* = source information */
4639 /* nl_out* = destination information (translated) */
4640 /* For an out packet, the fields are set like this: */
4641 /* nl_in* = source information (untranslated) */
4642 /* nl_out* = destination information (translated) */
4643 /* ------------------------------------------------------------------------ */
4644 nat_t *
ipf_nat_lookupredir(np)4645 ipf_nat_lookupredir(np)
4646 natlookup_t *np;
4647 {
4648 fr_info_t fi;
4649 nat_t *nat;
4650
4651 bzero((char *)&fi, sizeof(fi));
4652 if (np->nl_flags & IPN_IN) {
4653 fi.fin_data[0] = ntohs(np->nl_realport);
4654 fi.fin_data[1] = ntohs(np->nl_outport);
4655 } else {
4656 fi.fin_data[0] = ntohs(np->nl_inport);
4657 fi.fin_data[1] = ntohs(np->nl_outport);
4658 }
4659 if (np->nl_flags & IPN_TCP)
4660 fi.fin_p = IPPROTO_TCP;
4661 else if (np->nl_flags & IPN_UDP)
4662 fi.fin_p = IPPROTO_UDP;
4663 else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY))
4664 fi.fin_p = IPPROTO_ICMP;
4665
4666 /*
4667 * We can do two sorts of lookups:
4668 * - IPN_IN: we have the `real' and `out' address, look for `in'.
4669 * - default: we have the `in' and `out' address, look for `real'.
4670 */
4671 if (np->nl_flags & IPN_IN) {
4672 if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p,
4673 np->nl_realip, np->nl_outip))) {
4674 np->nl_inip = nat->nat_odstip;
4675 np->nl_inport = nat->nat_odport;
4676 }
4677 } else {
4678 /*
4679 * If nl_inip is non null, this is a lookup based on the real
4680 * ip address. Else, we use the fake.
4681 */
4682 if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p,
4683 np->nl_inip, np->nl_outip))) {
4684
4685 if ((np->nl_flags & IPN_FINDFORWARD) != 0) {
4686 fr_info_t fin;
4687 bzero((char *)&fin, sizeof(fin));
4688 fin.fin_p = nat->nat_pr[0];
4689 fin.fin_data[0] = ntohs(nat->nat_ndport);
4690 fin.fin_data[1] = ntohs(nat->nat_nsport);
4691 if (ipf_nat_inlookup(&fin, np->nl_flags,
4692 fin.fin_p, nat->nat_ndstip,
4693 nat->nat_nsrcip) != NULL) {
4694 np->nl_flags &= ~IPN_FINDFORWARD;
4695 }
4696 }
4697
4698 np->nl_realip = nat->nat_odstip;
4699 np->nl_realport = nat->nat_odport;
4700 }
4701 }
4702
4703 return nat;
4704 }
4705
4706
4707 /* ------------------------------------------------------------------------ */
4708 /* Function: ipf_nat_match */
4709 /* Returns: int - 0 == no match, 1 == match */
4710 /* Parameters: fin(I) - pointer to packet information */
4711 /* np(I) - pointer to NAT rule */
4712 /* */
4713 /* Pull the matching of a packet against a NAT rule out of that complex */
4714 /* loop inside ipf_nat_checkin() and lay it out properly in its own function. */
4715 /* ------------------------------------------------------------------------ */
4716 static int
ipf_nat_match(fin,np)4717 ipf_nat_match(fin, np)
4718 fr_info_t *fin;
4719 ipnat_t *np;
4720 {
4721 ipf_main_softc_t *softc = fin->fin_main_soft;
4722 frtuc_t *ft;
4723 int match;
4724
4725 match = 0;
4726 switch (np->in_osrcatype)
4727 {
4728 case FRI_NORMAL :
4729 match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr);
4730 break;
4731 case FRI_LOOKUP :
4732 match = (*np->in_osrcfunc)(softc, np->in_osrcptr,
4733 4, &fin->fin_saddr, fin->fin_plen);
4734 break;
4735 }
4736 match ^= ((np->in_flags & IPN_NOTSRC) != 0);
4737 if (match)
4738 return 0;
4739
4740 match = 0;
4741 switch (np->in_odstatype)
4742 {
4743 case FRI_NORMAL :
4744 match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr);
4745 break;
4746 case FRI_LOOKUP :
4747 match = (*np->in_odstfunc)(softc, np->in_odstptr,
4748 4, &fin->fin_daddr, fin->fin_plen);
4749 break;
4750 }
4751
4752 match ^= ((np->in_flags & IPN_NOTDST) != 0);
4753 if (match)
4754 return 0;
4755
4756 ft = &np->in_tuc;
4757 if (!(fin->fin_flx & FI_TCPUDP) ||
4758 (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) {
4759 if (ft->ftu_scmp || ft->ftu_dcmp)
4760 return 0;
4761 return 1;
4762 }
4763
4764 return ipf_tcpudpchk(&fin->fin_fi, ft);
4765 }
4766
4767
4768 /* ------------------------------------------------------------------------ */
4769 /* Function: ipf_nat_update */
4770 /* Returns: Nil */
4771 /* Parameters: fin(I) - pointer to packet information */
4772 /* nat(I) - pointer to NAT structure */
4773 /* */
4774 /* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */
4775 /* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */
4776 /* */
4777 /* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */
4778 /* already be set. */
4779 /* ------------------------------------------------------------------------ */
4780 void
ipf_nat_update(fin,nat)4781 ipf_nat_update(fin, nat)
4782 fr_info_t *fin;
4783 nat_t *nat;
4784 {
4785 ipf_main_softc_t *softc = fin->fin_main_soft;
4786 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
4787 ipftq_t *ifq, *ifq2;
4788 ipftqent_t *tqe;
4789 ipnat_t *np = nat->nat_ptr;
4790
4791 tqe = &nat->nat_tqe;
4792 ifq = tqe->tqe_ifq;
4793
4794 /*
4795 * We allow over-riding of NAT timeouts from NAT rules, even for
4796 * TCP, however, if it is TCP and there is no rule timeout set,
4797 * then do not update the timeout here.
4798 */
4799 if (np != NULL) {
4800 np->in_bytes[fin->fin_rev] += fin->fin_plen;
4801 ifq2 = np->in_tqehead[fin->fin_rev];
4802 } else {
4803 ifq2 = NULL;
4804 }
4805
4806 if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) {
4807 (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq,
4808 0, 2);
4809 } else {
4810 if (ifq2 == NULL) {
4811 if (nat->nat_pr[0] == IPPROTO_UDP)
4812 ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq :
4813 &softn->ipf_nat_udptq;
4814 else if (nat->nat_pr[0] == IPPROTO_ICMP ||
4815 nat->nat_pr[0] == IPPROTO_ICMPV6)
4816 ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq:
4817 &softn->ipf_nat_icmptq;
4818 else
4819 ifq2 = &softn->ipf_nat_iptq;
4820 }
4821
4822 ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2);
4823 }
4824 }
4825
4826
4827 /* ------------------------------------------------------------------------ */
4828 /* Function: ipf_nat_checkout */
4829 /* Returns: int - -1 == packet failed NAT checks so block it, */
4830 /* 0 == no packet translation occurred, */
4831 /* 1 == packet was successfully translated. */
4832 /* Parameters: fin(I) - pointer to packet information */
4833 /* passp(I) - pointer to filtering result flags */
4834 /* */
4835 /* Check to see if an outcoming packet should be changed. ICMP packets are */
4836 /* first checked to see if they match an existing entry (if an error), */
4837 /* otherwise a search of the current NAT table is made. If neither results */
4838 /* in a match then a search for a matching NAT rule is made. Create a new */
4839 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */
4840 /* packet header(s) as required. */
4841 /* ------------------------------------------------------------------------ */
4842 int
ipf_nat_checkout(fin,passp)4843 ipf_nat_checkout(fin, passp)
4844 fr_info_t *fin;
4845 u_32_t *passp;
4846 {
4847 ipnat_t *np = NULL, *npnext;
4848 struct ifnet *ifp, *sifp;
4849 ipf_main_softc_t *softc;
4850 ipf_nat_softc_t *softn;
4851 icmphdr_t *icmp = NULL;
4852 tcphdr_t *tcp = NULL;
4853 int rval, natfailed;
4854 u_int nflags = 0;
4855 u_32_t ipa, iph;
4856 int natadd = 1;
4857 frentry_t *fr;
4858 nat_t *nat;
4859
4860 if (fin->fin_v == 6) {
4861 #ifdef USE_INET6
4862 return ipf_nat6_checkout(fin, passp);
4863 #else
4864 return 0;
4865 #endif
4866 }
4867
4868 softc = fin->fin_main_soft;
4869 softn = softc->ipf_nat_soft;
4870
4871 if (softn->ipf_nat_lock != 0)
4872 return 0;
4873 if (softn->ipf_nat_stats.ns_rules == 0 &&
4874 softn->ipf_nat_instances == NULL)
4875 return 0;
4876
4877 natfailed = 0;
4878 fr = fin->fin_fr;
4879 sifp = fin->fin_ifp;
4880 if (fr != NULL) {
4881 ifp = fr->fr_tifs[fin->fin_rev].fd_ptr;
4882 if ((ifp != NULL) && (ifp != (void *)-1))
4883 fin->fin_ifp = ifp;
4884 }
4885 ifp = fin->fin_ifp;
4886
4887 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
4888 switch (fin->fin_p)
4889 {
4890 case IPPROTO_TCP :
4891 nflags = IPN_TCP;
4892 break;
4893 case IPPROTO_UDP :
4894 nflags = IPN_UDP;
4895 break;
4896 case IPPROTO_ICMP :
4897 icmp = fin->fin_dp;
4898
4899 /*
4900 * This is an incoming packet, so the destination is
4901 * the icmp_id and the source port equals 0
4902 */
4903 if ((fin->fin_flx & FI_ICMPQUERY) != 0)
4904 nflags = IPN_ICMPQUERY;
4905 break;
4906 default :
4907 break;
4908 }
4909
4910 if ((nflags & IPN_TCPUDP))
4911 tcp = fin->fin_dp;
4912 }
4913
4914 ipa = fin->fin_saddr;
4915
4916 READ_ENTER(&softc->ipf_nat);
4917
4918 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) &&
4919 (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND)))
4920 /*EMPTY*/;
4921 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin)))
4922 natadd = 0;
4923 else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH,
4924 (u_int)fin->fin_p, fin->fin_src,
4925 fin->fin_dst))) {
4926 nflags = nat->nat_flags;
4927 } else if (fin->fin_off == 0) {
4928 u_32_t hv, msk, nmsk = 0;
4929
4930 /*
4931 * If there is no current entry in the nat table for this IP#,
4932 * create one for it (if there is a matching rule).
4933 */
4934 maskloop:
4935 msk = softn->ipf_nat_map_active_masks[nmsk];
4936 iph = ipa & msk;
4937 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz);
4938 retry_roundrobin:
4939 for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) {
4940 npnext = np->in_mnext;
4941 if ((np->in_ifps[1] && (np->in_ifps[1] != ifp)))
4942 continue;
4943 if (np->in_v[0] != 4)
4944 continue;
4945 if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p))
4946 continue;
4947 if ((np->in_flags & IPN_RF) &&
4948 !(np->in_flags & nflags))
4949 continue;
4950 if (np->in_flags & IPN_FILTER) {
4951 switch (ipf_nat_match(fin, np))
4952 {
4953 case 0 :
4954 continue;
4955 case -1 :
4956 rval = -3;
4957 goto outmatchfail;
4958 case 1 :
4959 default :
4960 break;
4961 }
4962 } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr)
4963 continue;
4964
4965 if ((fr != NULL) &&
4966 !ipf_matchtag(&np->in_tag, &fr->fr_nattag))
4967 continue;
4968
4969 if (np->in_plabel != -1) {
4970 if (((np->in_flags & IPN_FILTER) == 0) &&
4971 (np->in_odport != fin->fin_data[1]))
4972 continue;
4973 if (ipf_proxy_ok(fin, tcp, np) == 0)
4974 continue;
4975 }
4976
4977 if (np->in_flags & IPN_NO) {
4978 np->in_hits++;
4979 break;
4980 }
4981 MUTEX_ENTER(&softn->ipf_nat_new);
4982 /*
4983 * If we've matched a round-robin rule but it has
4984 * moved in the list since we got it, start over as
4985 * this is now no longer correct.
4986 */
4987 if (npnext != np->in_mnext) {
4988 if ((np->in_flags & IPN_ROUNDR) != 0) {
4989 MUTEX_EXIT(&softn->ipf_nat_new);
4990 goto retry_roundrobin;
4991 }
4992 npnext = np->in_mnext;
4993 }
4994
4995 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND);
4996 MUTEX_EXIT(&softn->ipf_nat_new);
4997 if (nat != NULL) {
4998 natfailed = 0;
4999 break;
5000 }
5001 natfailed = -2;
5002 }
5003 if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) {
5004 nmsk++;
5005 goto maskloop;
5006 }
5007 }
5008
5009 if (nat != NULL) {
5010 rval = ipf_nat_out(fin, nat, natadd, nflags);
5011 if (rval == 1) {
5012 MUTEX_ENTER(&nat->nat_lock);
5013 ipf_nat_update(fin, nat);
5014 nat->nat_bytes[1] += fin->fin_plen;
5015 nat->nat_pkts[1]++;
5016 fin->fin_pktnum = nat->nat_pkts[1];
5017 MUTEX_EXIT(&nat->nat_lock);
5018 }
5019 } else
5020 rval = natfailed;
5021 outmatchfail:
5022 RWLOCK_EXIT(&softc->ipf_nat);
5023
5024 switch (rval)
5025 {
5026 case -3 :
5027 /* ipf_nat_match() failure */
5028 /* FALLTHROUGH */
5029 case -2 :
5030 /* retry_roundrobin loop failure */
5031 /* FALLTHROUGH */
5032 case -1 :
5033 /* proxy failure detected by ipf_nat_out() */
5034 if (passp != NULL) {
5035 DT2(frb_natv4out, fr_info_t *, fin, int, rval);
5036 NBUMPSIDED(1, ns_drop);
5037 *passp = FR_BLOCK;
5038 fin->fin_reason = FRB_NATV4;
5039 }
5040 fin->fin_flx |= FI_BADNAT;
5041 NBUMPSIDED(1, ns_badnat);
5042 rval = -1; /* We only return -1 on error. */
5043 break;
5044 case 0 :
5045 NBUMPSIDE(1, ns_ignored);
5046 break;
5047 case 1 :
5048 NBUMPSIDE(1, ns_translated);
5049 break;
5050 }
5051 fin->fin_ifp = sifp;
5052 return rval;
5053 }
5054
5055 /* ------------------------------------------------------------------------ */
5056 /* Function: ipf_nat_out */
5057 /* Returns: int - -1 == packet failed NAT checks so block it, */
5058 /* 1 == packet was successfully translated. */
5059 /* Parameters: fin(I) - pointer to packet information */
5060 /* nat(I) - pointer to NAT structure */
5061 /* natadd(I) - flag indicating if it is safe to add frag cache */
5062 /* nflags(I) - NAT flags set for this packet */
5063 /* */
5064 /* Translate a packet coming "out" on an interface. */
5065 /* ------------------------------------------------------------------------ */
5066 int
ipf_nat_out(fin,nat,natadd,nflags)5067 ipf_nat_out(fin, nat, natadd, nflags)
5068 fr_info_t *fin;
5069 nat_t *nat;
5070 int natadd;
5071 u_32_t nflags;
5072 {
5073 ipf_main_softc_t *softc = fin->fin_main_soft;
5074 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5075 icmphdr_t *icmp;
5076 tcphdr_t *tcp;
5077 ipnat_t *np;
5078 int skip;
5079 int i;
5080
5081 tcp = NULL;
5082 icmp = NULL;
5083 np = nat->nat_ptr;
5084
5085 if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL))
5086 (void) ipf_frag_natnew(softc, fin, 0, nat);
5087
5088 /*
5089 * Fix up checksums, not by recalculating them, but
5090 * simply computing adjustments.
5091 * This is only done for STREAMS based IP implementations where the
5092 * checksum has already been calculated by IP. In all other cases,
5093 * IPFilter is called before the checksum needs calculating so there
5094 * is no call to modify whatever is in the header now.
5095 */
5096 if (nflags == IPN_ICMPERR) {
5097 u_32_t s1, s2, sumd, msumd;
5098
5099 s1 = LONG_SUM(ntohl(fin->fin_saddr));
5100 if (nat->nat_dir == NAT_OUTBOUND) {
5101 s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr));
5102 } else {
5103 s2 = LONG_SUM(ntohl(nat->nat_odstaddr));
5104 }
5105 CALC_SUMD(s1, s2, sumd);
5106 msumd = sumd;
5107
5108 s1 = LONG_SUM(ntohl(fin->fin_daddr));
5109 if (nat->nat_dir == NAT_OUTBOUND) {
5110 s2 = LONG_SUM(ntohl(nat->nat_ndstaddr));
5111 } else {
5112 s2 = LONG_SUM(ntohl(nat->nat_osrcaddr));
5113 }
5114 CALC_SUMD(s1, s2, sumd);
5115 msumd += sumd;
5116
5117 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0);
5118 }
5119 #if !defined(_KERNEL) || SOLARIS || \
5120 defined(BRIDGE_IPF) || defined(__FreeBSD__)
5121 else {
5122 /*
5123 * Strictly speaking, this isn't necessary on BSD
5124 * kernels because they do checksum calculation after
5125 * this code has run BUT if ipfilter is being used
5126 * to do NAT as a bridge, that code doesn't exist.
5127 */
5128 switch (nat->nat_dir)
5129 {
5130 case NAT_OUTBOUND :
5131 ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART,
5132 &fin->fin_ip->ip_sum,
5133 nat->nat_ipsumd, 0);
5134 break;
5135
5136 case NAT_INBOUND :
5137 ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART,
5138 &fin->fin_ip->ip_sum,
5139 nat->nat_ipsumd, 0);
5140 break;
5141
5142 default :
5143 break;
5144 }
5145 }
5146 #endif
5147
5148 /*
5149 * Address assignment is after the checksum modification because
5150 * we are using the address in the packet for determining the
5151 * correct checksum offset (the ICMP error could be coming from
5152 * anyone...)
5153 */
5154 switch (nat->nat_dir)
5155 {
5156 case NAT_OUTBOUND :
5157 fin->fin_ip->ip_src = nat->nat_nsrcip;
5158 fin->fin_saddr = nat->nat_nsrcaddr;
5159 fin->fin_ip->ip_dst = nat->nat_ndstip;
5160 fin->fin_daddr = nat->nat_ndstaddr;
5161 break;
5162
5163 case NAT_INBOUND :
5164 fin->fin_ip->ip_src = nat->nat_odstip;
5165 fin->fin_saddr = nat->nat_ndstaddr;
5166 fin->fin_ip->ip_dst = nat->nat_osrcip;
5167 fin->fin_daddr = nat->nat_nsrcaddr;
5168 break;
5169
5170 case NAT_DIVERTIN :
5171 {
5172 mb_t *m;
5173
5174 skip = ipf_nat_decap(fin, nat);
5175 if (skip <= 0) {
5176 NBUMPSIDED(1, ns_decap_fail);
5177 return -1;
5178 }
5179
5180 m = fin->fin_m;
5181
5182 #if SOLARIS && defined(_KERNEL)
5183 m->b_rptr += skip;
5184 #else
5185 m->m_data += skip;
5186 m->m_len -= skip;
5187
5188 # ifdef M_PKTHDR
5189 if (m->m_flags & M_PKTHDR)
5190 m->m_pkthdr.len -= skip;
5191 # endif
5192 #endif
5193
5194 MUTEX_ENTER(&nat->nat_lock);
5195 ipf_nat_update(fin, nat);
5196 MUTEX_EXIT(&nat->nat_lock);
5197 fin->fin_flx |= FI_NATED;
5198 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5199 fin->fin_nattag = &np->in_tag;
5200 return 1;
5201 /* NOTREACHED */
5202 }
5203
5204 case NAT_DIVERTOUT :
5205 {
5206 u_32_t s1, s2, sumd;
5207 udphdr_t *uh;
5208 ip_t *ip;
5209 mb_t *m;
5210
5211 m = M_DUP(np->in_divmp);
5212 if (m == NULL) {
5213 NBUMPSIDED(1, ns_divert_dup);
5214 return -1;
5215 }
5216
5217 ip = MTOD(m, ip_t *);
5218 ip_fillid(ip);
5219 s2 = ntohs(ip->ip_id);
5220
5221 s1 = ip->ip_len;
5222 ip->ip_len = ntohs(ip->ip_len);
5223 ip->ip_len += fin->fin_plen;
5224 ip->ip_len = htons(ip->ip_len);
5225 s2 += ntohs(ip->ip_len);
5226 CALC_SUMD(s1, s2, sumd);
5227
5228 uh = (udphdr_t *)(ip + 1);
5229 uh->uh_ulen += fin->fin_plen;
5230 uh->uh_ulen = htons(uh->uh_ulen);
5231 #if !defined(_KERNEL) || SOLARIS || \
5232 defined(BRIDGE_IPF) || defined(__FreeBSD__)
5233 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0);
5234 #endif
5235
5236 PREP_MB_T(fin, m);
5237
5238 fin->fin_src = ip->ip_src;
5239 fin->fin_dst = ip->ip_dst;
5240 fin->fin_ip = ip;
5241 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */
5242 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */
5243
5244 nflags &= ~IPN_TCPUDPICMP;
5245
5246 break;
5247 }
5248
5249 default :
5250 break;
5251 }
5252
5253 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5254 u_short *csump;
5255
5256 if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) {
5257 tcp = fin->fin_dp;
5258
5259 switch (nat->nat_dir)
5260 {
5261 case NAT_OUTBOUND :
5262 tcp->th_sport = nat->nat_nsport;
5263 fin->fin_data[0] = ntohs(nat->nat_nsport);
5264 tcp->th_dport = nat->nat_ndport;
5265 fin->fin_data[1] = ntohs(nat->nat_ndport);
5266 break;
5267
5268 case NAT_INBOUND :
5269 tcp->th_sport = nat->nat_odport;
5270 fin->fin_data[0] = ntohs(nat->nat_odport);
5271 tcp->th_dport = nat->nat_osport;
5272 fin->fin_data[1] = ntohs(nat->nat_osport);
5273 break;
5274 }
5275 }
5276
5277 if ((nat->nat_nsport != 0) && (nflags & IPN_ICMPQUERY)) {
5278 icmp = fin->fin_dp;
5279 icmp->icmp_id = nat->nat_nicmpid;
5280 }
5281
5282 csump = ipf_nat_proto(fin, nat, nflags);
5283
5284 /*
5285 * The above comments do not hold for layer 4 (or higher)
5286 * checksums...
5287 */
5288 if (csump != NULL) {
5289 if (nat->nat_dir == NAT_OUTBOUND)
5290 ipf_fix_outcksum(fin->fin_cksum, csump,
5291 nat->nat_sumd[0],
5292 nat->nat_sumd[1] +
5293 fin->fin_dlen);
5294 else
5295 ipf_fix_incksum(fin->fin_cksum, csump,
5296 nat->nat_sumd[0],
5297 nat->nat_sumd[1] +
5298 fin->fin_dlen);
5299 }
5300 }
5301
5302 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync);
5303 /* ------------------------------------------------------------- */
5304 /* A few quick notes: */
5305 /* Following are test conditions prior to calling the */
5306 /* ipf_proxy_check routine. */
5307 /* */
5308 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */
5309 /* with a redirect rule, we attempt to match the packet's */
5310 /* source port against in_dport, otherwise we'd compare the */
5311 /* packet's destination. */
5312 /* ------------------------------------------------------------- */
5313 if ((np != NULL) && (np->in_apr != NULL)) {
5314 i = ipf_proxy_check(fin, nat);
5315 if (i == -1) {
5316 NBUMPSIDED(1, ns_ipf_proxy_fail);
5317 }
5318 } else {
5319 i = 1;
5320 }
5321 fin->fin_flx |= FI_NATED;
5322 return i;
5323 }
5324
5325
5326 /* ------------------------------------------------------------------------ */
5327 /* Function: ipf_nat_checkin */
5328 /* Returns: int - -1 == packet failed NAT checks so block it, */
5329 /* 0 == no packet translation occurred, */
5330 /* 1 == packet was successfully translated. */
5331 /* Parameters: fin(I) - pointer to packet information */
5332 /* passp(I) - pointer to filtering result flags */
5333 /* */
5334 /* Check to see if an incoming packet should be changed. ICMP packets are */
5335 /* first checked to see if they match an existing entry (if an error), */
5336 /* otherwise a search of the current NAT table is made. If neither results */
5337 /* in a match then a search for a matching NAT rule is made. Create a new */
5338 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */
5339 /* packet header(s) as required. */
5340 /* ------------------------------------------------------------------------ */
5341 int
ipf_nat_checkin(fin,passp)5342 ipf_nat_checkin(fin, passp)
5343 fr_info_t *fin;
5344 u_32_t *passp;
5345 {
5346 ipf_main_softc_t *softc;
5347 ipf_nat_softc_t *softn;
5348 u_int nflags, natadd;
5349 ipnat_t *np, *npnext;
5350 int rval, natfailed;
5351 struct ifnet *ifp;
5352 struct in_addr in;
5353 icmphdr_t *icmp;
5354 tcphdr_t *tcp;
5355 u_short dport;
5356 nat_t *nat;
5357 u_32_t iph;
5358
5359 softc = fin->fin_main_soft;
5360 softn = softc->ipf_nat_soft;
5361
5362 if (softn->ipf_nat_lock != 0)
5363 return 0;
5364 if (softn->ipf_nat_stats.ns_rules == 0 &&
5365 softn->ipf_nat_instances == NULL)
5366 return 0;
5367
5368 tcp = NULL;
5369 icmp = NULL;
5370 dport = 0;
5371 natadd = 1;
5372 nflags = 0;
5373 natfailed = 0;
5374 ifp = fin->fin_ifp;
5375
5376 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5377 switch (fin->fin_p)
5378 {
5379 case IPPROTO_TCP :
5380 nflags = IPN_TCP;
5381 break;
5382 case IPPROTO_UDP :
5383 nflags = IPN_UDP;
5384 break;
5385 case IPPROTO_ICMP :
5386 icmp = fin->fin_dp;
5387
5388 /*
5389 * This is an incoming packet, so the destination is
5390 * the icmp_id and the source port equals 0
5391 */
5392 if ((fin->fin_flx & FI_ICMPQUERY) != 0) {
5393 nflags = IPN_ICMPQUERY;
5394 dport = icmp->icmp_id;
5395 } break;
5396 default :
5397 break;
5398 }
5399
5400 if ((nflags & IPN_TCPUDP)) {
5401 tcp = fin->fin_dp;
5402 dport = fin->fin_data[1];
5403 }
5404 }
5405
5406 in = fin->fin_dst;
5407
5408 READ_ENTER(&softc->ipf_nat);
5409
5410 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) &&
5411 (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND)))
5412 /*EMPTY*/;
5413 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin)))
5414 natadd = 0;
5415 else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH,
5416 (u_int)fin->fin_p,
5417 fin->fin_src, in))) {
5418 nflags = nat->nat_flags;
5419 } else if (fin->fin_off == 0) {
5420 u_32_t hv, msk, rmsk = 0;
5421
5422 /*
5423 * If there is no current entry in the nat table for this IP#,
5424 * create one for it (if there is a matching rule).
5425 */
5426 maskloop:
5427 msk = softn->ipf_nat_rdr_active_masks[rmsk];
5428 iph = in.s_addr & msk;
5429 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz);
5430 retry_roundrobin:
5431 /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */
5432 for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) {
5433 npnext = np->in_rnext;
5434 if (np->in_ifps[0] && (np->in_ifps[0] != ifp))
5435 continue;
5436 if (np->in_v[0] != 4)
5437 continue;
5438 if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p))
5439 continue;
5440 if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags))
5441 continue;
5442 if (np->in_flags & IPN_FILTER) {
5443 switch (ipf_nat_match(fin, np))
5444 {
5445 case 0 :
5446 continue;
5447 case -1 :
5448 rval = -3;
5449 goto inmatchfail;
5450 case 1 :
5451 default :
5452 break;
5453 }
5454 } else {
5455 if ((in.s_addr & np->in_odstmsk) !=
5456 np->in_odstaddr)
5457 continue;
5458 if (np->in_odport &&
5459 ((np->in_dtop < dport) ||
5460 (dport < np->in_odport)))
5461 continue;
5462 }
5463
5464 if (np->in_plabel != -1) {
5465 if (!ipf_proxy_ok(fin, tcp, np)) {
5466 continue;
5467 }
5468 }
5469
5470 if (np->in_flags & IPN_NO) {
5471 np->in_hits++;
5472 break;
5473 }
5474
5475 MUTEX_ENTER(&softn->ipf_nat_new);
5476 /*
5477 * If we've matched a round-robin rule but it has
5478 * moved in the list since we got it, start over as
5479 * this is now no longer correct.
5480 */
5481 if (npnext != np->in_rnext) {
5482 if ((np->in_flags & IPN_ROUNDR) != 0) {
5483 MUTEX_EXIT(&softn->ipf_nat_new);
5484 goto retry_roundrobin;
5485 }
5486 npnext = np->in_rnext;
5487 }
5488
5489 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND);
5490 MUTEX_EXIT(&softn->ipf_nat_new);
5491 if (nat != NULL) {
5492 natfailed = 0;
5493 break;
5494 }
5495 natfailed = -2;
5496 }
5497 if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) {
5498 rmsk++;
5499 goto maskloop;
5500 }
5501 }
5502
5503 if (nat != NULL) {
5504 rval = ipf_nat_in(fin, nat, natadd, nflags);
5505 if (rval == 1) {
5506 MUTEX_ENTER(&nat->nat_lock);
5507 ipf_nat_update(fin, nat);
5508 nat->nat_bytes[0] += fin->fin_plen;
5509 nat->nat_pkts[0]++;
5510 fin->fin_pktnum = nat->nat_pkts[0];
5511 MUTEX_EXIT(&nat->nat_lock);
5512 }
5513 } else
5514 rval = natfailed;
5515 inmatchfail:
5516 RWLOCK_EXIT(&softc->ipf_nat);
5517
5518 switch (rval)
5519 {
5520 case -3 :
5521 /* ipf_nat_match() failure */
5522 /* FALLTHROUGH */
5523 case -2 :
5524 /* retry_roundrobin loop failure */
5525 /* FALLTHROUGH */
5526 case -1 :
5527 /* proxy failure detected by ipf_nat_out() */
5528 if (passp != NULL) {
5529 DT2(frb_natv4in, fr_info_t *, fin, int, rval);
5530 NBUMPSIDED(0, ns_drop);
5531 *passp = FR_BLOCK;
5532 fin->fin_reason = FRB_NATV4;
5533 }
5534 fin->fin_flx |= FI_BADNAT;
5535 NBUMPSIDED(0, ns_badnat);
5536 rval = -1; /* We only return -1 on error. */
5537 break;
5538 case 0 :
5539 NBUMPSIDE(0, ns_ignored);
5540 break;
5541 case 1 :
5542 NBUMPSIDE(0, ns_translated);
5543 break;
5544 }
5545 return rval;
5546 }
5547
5548
5549 /* ------------------------------------------------------------------------ */
5550 /* Function: ipf_nat_in */
5551 /* Returns: int - -1 == packet failed NAT checks so block it, */
5552 /* 1 == packet was successfully translated. */
5553 /* Parameters: fin(I) - pointer to packet information */
5554 /* nat(I) - pointer to NAT structure */
5555 /* natadd(I) - flag indicating if it is safe to add frag cache */
5556 /* nflags(I) - NAT flags set for this packet */
5557 /* Locks Held: ipf_nat(READ) */
5558 /* */
5559 /* Translate a packet coming "in" on an interface. */
5560 /* ------------------------------------------------------------------------ */
5561 int
ipf_nat_in(fin,nat,natadd,nflags)5562 ipf_nat_in(fin, nat, natadd, nflags)
5563 fr_info_t *fin;
5564 nat_t *nat;
5565 int natadd;
5566 u_32_t nflags;
5567 {
5568 ipf_main_softc_t *softc = fin->fin_main_soft;
5569 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5570 u_32_t sumd, ipsumd, sum1, sum2;
5571 icmphdr_t *icmp;
5572 tcphdr_t *tcp;
5573 ipnat_t *np;
5574 int skip;
5575 int i;
5576
5577 tcp = NULL;
5578 np = nat->nat_ptr;
5579 fin->fin_fr = nat->nat_fr;
5580
5581 if (np != NULL) {
5582 if ((natadd != 0) && (fin->fin_flx & FI_FRAG))
5583 (void) ipf_frag_natnew(softc, fin, 0, nat);
5584
5585 /* ------------------------------------------------------------- */
5586 /* A few quick notes: */
5587 /* Following are test conditions prior to calling the */
5588 /* ipf_proxy_check routine. */
5589 /* */
5590 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */
5591 /* with a map rule, we attempt to match the packet's */
5592 /* source port against in_dport, otherwise we'd compare the */
5593 /* packet's destination. */
5594 /* ------------------------------------------------------------- */
5595 if (np->in_apr != NULL) {
5596 i = ipf_proxy_check(fin, nat);
5597 if (i == -1) {
5598 NBUMPSIDED(0, ns_ipf_proxy_fail);
5599 return -1;
5600 }
5601 }
5602 }
5603
5604 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync);
5605
5606 ipsumd = nat->nat_ipsumd;
5607 /*
5608 * Fix up checksums, not by recalculating them, but
5609 * simply computing adjustments.
5610 * Why only do this for some platforms on inbound packets ?
5611 * Because for those that it is done, IP processing is yet to happen
5612 * and so the IPv4 header checksum has not yet been evaluated.
5613 * Perhaps it should always be done for the benefit of things like
5614 * fast forwarding (so that it doesn't need to be recomputed) but with
5615 * header checksum offloading, perhaps it is a moot point.
5616 */
5617
5618 switch (nat->nat_dir)
5619 {
5620 case NAT_INBOUND :
5621 if ((fin->fin_flx & FI_ICMPERR) == 0) {
5622 fin->fin_ip->ip_src = nat->nat_nsrcip;
5623 fin->fin_saddr = nat->nat_nsrcaddr;
5624 } else {
5625 sum1 = nat->nat_osrcaddr;
5626 sum2 = nat->nat_nsrcaddr;
5627 CALC_SUMD(sum1, sum2, sumd);
5628 ipsumd -= sumd;
5629 }
5630 fin->fin_ip->ip_dst = nat->nat_ndstip;
5631 fin->fin_daddr = nat->nat_ndstaddr;
5632 #if !defined(_KERNEL) || SOLARIS
5633 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0);
5634 #endif
5635 break;
5636
5637 case NAT_OUTBOUND :
5638 if ((fin->fin_flx & FI_ICMPERR) == 0) {
5639 fin->fin_ip->ip_src = nat->nat_odstip;
5640 fin->fin_saddr = nat->nat_odstaddr;
5641 } else {
5642 sum1 = nat->nat_odstaddr;
5643 sum2 = nat->nat_ndstaddr;
5644 CALC_SUMD(sum1, sum2, sumd);
5645 ipsumd -= sumd;
5646 }
5647 fin->fin_ip->ip_dst = nat->nat_osrcip;
5648 fin->fin_daddr = nat->nat_osrcaddr;
5649 #if !defined(_KERNEL) || SOLARIS
5650 ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0);
5651 #endif
5652 break;
5653
5654 case NAT_DIVERTIN :
5655 {
5656 udphdr_t *uh;
5657 ip_t *ip;
5658 mb_t *m;
5659
5660 m = M_DUP(np->in_divmp);
5661 if (m == NULL) {
5662 NBUMPSIDED(0, ns_divert_dup);
5663 return -1;
5664 }
5665
5666 ip = MTOD(m, ip_t *);
5667 ip_fillid(ip);
5668 sum1 = ntohs(ip->ip_len);
5669 ip->ip_len = ntohs(ip->ip_len);
5670 ip->ip_len += fin->fin_plen;
5671 ip->ip_len = htons(ip->ip_len);
5672
5673 uh = (udphdr_t *)(ip + 1);
5674 uh->uh_ulen += fin->fin_plen;
5675 uh->uh_ulen = htons(uh->uh_ulen);
5676
5677 sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len);
5678 sum2 += ntohs(ip->ip_off) & IP_DF;
5679 CALC_SUMD(sum1, sum2, sumd);
5680
5681 #if !defined(_KERNEL) || SOLARIS
5682 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0);
5683 #endif
5684 PREP_MB_T(fin, m);
5685
5686 fin->fin_ip = ip;
5687 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */
5688 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */
5689
5690 nflags &= ~IPN_TCPUDPICMP;
5691
5692 break;
5693 }
5694
5695 case NAT_DIVERTOUT :
5696 {
5697 mb_t *m;
5698
5699 skip = ipf_nat_decap(fin, nat);
5700 if (skip <= 0) {
5701 NBUMPSIDED(0, ns_decap_fail);
5702 return -1;
5703 }
5704
5705 m = fin->fin_m;
5706
5707 #if SOLARIS && defined(_KERNEL)
5708 m->b_rptr += skip;
5709 #else
5710 m->m_data += skip;
5711 m->m_len -= skip;
5712
5713 # ifdef M_PKTHDR
5714 if (m->m_flags & M_PKTHDR)
5715 m->m_pkthdr.len -= skip;
5716 # endif
5717 #endif
5718
5719 ipf_nat_update(fin, nat);
5720 nflags &= ~IPN_TCPUDPICMP;
5721 fin->fin_flx |= FI_NATED;
5722 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5723 fin->fin_nattag = &np->in_tag;
5724 return 1;
5725 /* NOTREACHED */
5726 }
5727 }
5728 if (nflags & IPN_TCPUDP)
5729 tcp = fin->fin_dp;
5730
5731 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) {
5732 u_short *csump;
5733
5734 if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) {
5735 switch (nat->nat_dir)
5736 {
5737 case NAT_INBOUND :
5738 tcp->th_sport = nat->nat_nsport;
5739 fin->fin_data[0] = ntohs(nat->nat_nsport);
5740 tcp->th_dport = nat->nat_ndport;
5741 fin->fin_data[1] = ntohs(nat->nat_ndport);
5742 break;
5743
5744 case NAT_OUTBOUND :
5745 tcp->th_sport = nat->nat_odport;
5746 fin->fin_data[0] = ntohs(nat->nat_odport);
5747 tcp->th_dport = nat->nat_osport;
5748 fin->fin_data[1] = ntohs(nat->nat_osport);
5749 break;
5750 }
5751 }
5752
5753
5754 if ((nat->nat_odport != 0) && (nflags & IPN_ICMPQUERY)) {
5755 icmp = fin->fin_dp;
5756
5757 icmp->icmp_id = nat->nat_nicmpid;
5758 }
5759
5760 csump = ipf_nat_proto(fin, nat, nflags);
5761
5762 /*
5763 * The above comments do not hold for layer 4 (or higher)
5764 * checksums...
5765 */
5766 if (csump != NULL) {
5767 if (nat->nat_dir == NAT_OUTBOUND)
5768 ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0);
5769 else
5770 ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0);
5771 }
5772 }
5773
5774 fin->fin_flx |= FI_NATED;
5775 if (np != NULL && np->in_tag.ipt_num[0] != 0)
5776 fin->fin_nattag = &np->in_tag;
5777 return 1;
5778 }
5779
5780
5781 /* ------------------------------------------------------------------------ */
5782 /* Function: ipf_nat_proto */
5783 /* Returns: u_short* - pointer to transport header checksum to update, */
5784 /* NULL if the transport protocol is not recognised */
5785 /* as needing a checksum update. */
5786 /* Parameters: fin(I) - pointer to packet information */
5787 /* nat(I) - pointer to NAT structure */
5788 /* nflags(I) - NAT flags set for this packet */
5789 /* */
5790 /* Return the pointer to the checksum field for each protocol so understood.*/
5791 /* If support for making other changes to a protocol header is required, */
5792 /* that is not strictly 'address' translation, such as clamping the MSS in */
5793 /* TCP down to a specific value, then do it from here. */
5794 /* ------------------------------------------------------------------------ */
5795 u_short *
ipf_nat_proto(fin,nat,nflags)5796 ipf_nat_proto(fin, nat, nflags)
5797 fr_info_t *fin;
5798 nat_t *nat;
5799 u_int nflags;
5800 {
5801 icmphdr_t *icmp;
5802 u_short *csump;
5803 tcphdr_t *tcp;
5804 udphdr_t *udp;
5805
5806 csump = NULL;
5807 if (fin->fin_out == 0) {
5808 fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND);
5809 } else {
5810 fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0);
5811 }
5812
5813 switch (fin->fin_p)
5814 {
5815 case IPPROTO_TCP :
5816 tcp = fin->fin_dp;
5817
5818 if ((nflags & IPN_TCP) != 0)
5819 csump = &tcp->th_sum;
5820
5821 /*
5822 * Do a MSS CLAMPING on a SYN packet,
5823 * only deal IPv4 for now.
5824 */
5825 if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0)
5826 ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump);
5827
5828 break;
5829
5830 case IPPROTO_UDP :
5831 udp = fin->fin_dp;
5832
5833 if ((nflags & IPN_UDP) != 0) {
5834 if (udp->uh_sum != 0)
5835 csump = &udp->uh_sum;
5836 }
5837 break;
5838
5839 case IPPROTO_ICMP :
5840 icmp = fin->fin_dp;
5841
5842 if ((nflags & IPN_ICMPQUERY) != 0) {
5843 if (icmp->icmp_cksum != 0)
5844 csump = &icmp->icmp_cksum;
5845 }
5846 break;
5847
5848 #ifdef USE_INET6
5849 case IPPROTO_ICMPV6 :
5850 {
5851 struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp;
5852
5853 icmp6 = fin->fin_dp;
5854
5855 if ((nflags & IPN_ICMPQUERY) != 0) {
5856 if (icmp6->icmp6_cksum != 0)
5857 csump = &icmp6->icmp6_cksum;
5858 }
5859 break;
5860 }
5861 #endif
5862 }
5863 return csump;
5864 }
5865
5866
5867 /* ------------------------------------------------------------------------ */
5868 /* Function: ipf_nat_expire */
5869 /* Returns: Nil */
5870 /* Parameters: softc(I) - pointer to soft context main structure */
5871 /* */
5872 /* Check all of the timeout queues for entries at the top which need to be */
5873 /* expired. */
5874 /* ------------------------------------------------------------------------ */
5875 void
ipf_nat_expire(softc)5876 ipf_nat_expire(softc)
5877 ipf_main_softc_t *softc;
5878 {
5879 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5880 ipftq_t *ifq, *ifqnext;
5881 ipftqent_t *tqe, *tqn;
5882 int i;
5883 SPL_INT(s);
5884
5885 SPL_NET(s);
5886 WRITE_ENTER(&softc->ipf_nat);
5887 for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL;
5888 ifq = ifq->ifq_next) {
5889 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) {
5890 if (tqe->tqe_die > softc->ipf_ticks)
5891 break;
5892 tqn = tqe->tqe_next;
5893 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE);
5894 }
5895 }
5896
5897 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) {
5898 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) {
5899 if (tqe->tqe_die > softc->ipf_ticks)
5900 break;
5901 tqn = tqe->tqe_next;
5902 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE);
5903 }
5904 }
5905
5906 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) {
5907 ifqnext = ifq->ifq_next;
5908
5909 if (((ifq->ifq_flags & IFQF_DELETE) != 0) &&
5910 (ifq->ifq_ref == 0)) {
5911 ipf_freetimeoutqueue(softc, ifq);
5912 }
5913 }
5914
5915 if (softn->ipf_nat_doflush != 0) {
5916 ipf_nat_extraflush(softc, softn, 2);
5917 softn->ipf_nat_doflush = 0;
5918 }
5919
5920 RWLOCK_EXIT(&softc->ipf_nat);
5921 SPL_X(s);
5922 }
5923
5924
5925 /* ------------------------------------------------------------------------ */
5926 /* Function: ipf_nat_sync */
5927 /* Returns: Nil */
5928 /* Parameters: softc(I) - pointer to soft context main structure */
5929 /* ifp(I) - pointer to network interface */
5930 /* */
5931 /* Walk through all of the currently active NAT sessions, looking for those */
5932 /* which need to have their translated address updated. */
5933 /* ------------------------------------------------------------------------ */
5934 void
ipf_nat_sync(softc,ifp)5935 ipf_nat_sync(softc, ifp)
5936 ipf_main_softc_t *softc;
5937 void *ifp;
5938 {
5939 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
5940 u_32_t sum1, sum2, sumd;
5941 i6addr_t in;
5942 ipnat_t *n;
5943 nat_t *nat;
5944 void *ifp2;
5945 int idx;
5946 SPL_INT(s);
5947
5948 if (softc->ipf_running <= 0)
5949 return;
5950
5951 /*
5952 * Change IP addresses for NAT sessions for any protocol except TCP
5953 * since it will break the TCP connection anyway. The only rules
5954 * which will get changed are those which are "map ... -> 0/32",
5955 * where the rule specifies the address is taken from the interface.
5956 */
5957 SPL_NET(s);
5958 WRITE_ENTER(&softc->ipf_nat);
5959
5960 if (softc->ipf_running <= 0) {
5961 RWLOCK_EXIT(&softc->ipf_nat);
5962 return;
5963 }
5964
5965 for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) {
5966 if ((nat->nat_flags & IPN_TCP) != 0)
5967 continue;
5968
5969 n = nat->nat_ptr;
5970 if (n != NULL) {
5971 if (n->in_v[1] == 4) {
5972 if (n->in_redir & NAT_MAP) {
5973 if ((n->in_nsrcaddr != 0) ||
5974 (n->in_nsrcmsk != 0xffffffff))
5975 continue;
5976 } else if (n->in_redir & NAT_REDIRECT) {
5977 if ((n->in_ndstaddr != 0) ||
5978 (n->in_ndstmsk != 0xffffffff))
5979 continue;
5980 }
5981 }
5982 #ifdef USE_INET6
5983 if (n->in_v[1] == 4) {
5984 if (n->in_redir & NAT_MAP) {
5985 if (!IP6_ISZERO(&n->in_nsrcaddr) ||
5986 !IP6_ISONES(&n->in_nsrcmsk))
5987 continue;
5988 } else if (n->in_redir & NAT_REDIRECT) {
5989 if (!IP6_ISZERO(&n->in_ndstaddr) ||
5990 !IP6_ISONES(&n->in_ndstmsk))
5991 continue;
5992 }
5993 }
5994 #endif
5995 }
5996
5997 if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) ||
5998 (ifp == nat->nat_ifps[1]))) {
5999 nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0],
6000 nat->nat_v[0]);
6001 if ((nat->nat_ifps[0] != NULL) &&
6002 (nat->nat_ifps[0] != (void *)-1)) {
6003 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]);
6004 }
6005 if (nat->nat_ifnames[1][0] != '\0') {
6006 nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1],
6007 nat->nat_v[1]);
6008 } else {
6009 nat->nat_ifps[1] = nat->nat_ifps[0];
6010 }
6011 if ((nat->nat_ifps[1] != NULL) &&
6012 (nat->nat_ifps[1] != (void *)-1)) {
6013 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]);
6014 }
6015 ifp2 = nat->nat_ifps[0];
6016 if (ifp2 == NULL)
6017 continue;
6018
6019 /*
6020 * Change the map-to address to be the same as the
6021 * new one.
6022 */
6023 sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6);
6024 if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2,
6025 &in, NULL) != -1) {
6026 if (nat->nat_v[0] == 4)
6027 nat->nat_nsrcip = in.in4;
6028 }
6029 sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6);
6030
6031 if (sum1 == sum2)
6032 continue;
6033 /*
6034 * Readjust the checksum adjustment to take into
6035 * account the new IP#.
6036 */
6037 CALC_SUMD(sum1, sum2, sumd);
6038 /* XXX - dont change for TCP when solaris does
6039 * hardware checksumming.
6040 */
6041 sumd += nat->nat_sumd[0];
6042 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16);
6043 nat->nat_sumd[1] = nat->nat_sumd[0];
6044 }
6045 }
6046
6047 for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) {
6048 char *base = n->in_names;
6049
6050 if ((ifp == NULL) || (n->in_ifps[0] == ifp))
6051 n->in_ifps[0] = ipf_resolvenic(softc,
6052 base + n->in_ifnames[0],
6053 n->in_v[0]);
6054 if ((ifp == NULL) || (n->in_ifps[1] == ifp))
6055 n->in_ifps[1] = ipf_resolvenic(softc,
6056 base + n->in_ifnames[1],
6057 n->in_v[1]);
6058
6059 if (n->in_redir & NAT_REDIRECT)
6060 idx = 1;
6061 else
6062 idx = 0;
6063
6064 if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) &&
6065 (n->in_ifps[idx] != NULL &&
6066 n->in_ifps[idx] != (void *)-1)) {
6067
6068 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc,
6069 0, n->in_ifps[idx]);
6070 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst,
6071 0, n->in_ifps[idx]);
6072 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc,
6073 0, n->in_ifps[idx]);
6074 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst,
6075 0, n->in_ifps[idx]);
6076 }
6077 }
6078 RWLOCK_EXIT(&softc->ipf_nat);
6079 SPL_X(s);
6080 }
6081
6082
6083 /* ------------------------------------------------------------------------ */
6084 /* Function: ipf_nat_icmpquerytype */
6085 /* Returns: int - 1 == success, 0 == failure */
6086 /* Parameters: icmptype(I) - ICMP type number */
6087 /* */
6088 /* Tests to see if the ICMP type number passed is a query/response type or */
6089 /* not. */
6090 /* ------------------------------------------------------------------------ */
6091 static int
ipf_nat_icmpquerytype(icmptype)6092 ipf_nat_icmpquerytype(icmptype)
6093 int icmptype;
6094 {
6095
6096 /*
6097 * For the ICMP query NAT code, it is essential that both the query
6098 * and the reply match on the NAT rule. Because the NAT structure
6099 * does not keep track of the icmptype, and a single NAT structure
6100 * is used for all icmp types with the same src, dest and id, we
6101 * simply define the replies as queries as well. The funny thing is,
6102 * altough it seems silly to call a reply a query, this is exactly
6103 * as it is defined in the IPv4 specification
6104 */
6105 switch (icmptype)
6106 {
6107 case ICMP_ECHOREPLY:
6108 case ICMP_ECHO:
6109 /* route advertisement/solicitation is currently unsupported: */
6110 /* it would require rewriting the ICMP data section */
6111 case ICMP_TSTAMP:
6112 case ICMP_TSTAMPREPLY:
6113 case ICMP_IREQ:
6114 case ICMP_IREQREPLY:
6115 case ICMP_MASKREQ:
6116 case ICMP_MASKREPLY:
6117 return 1;
6118 default:
6119 return 0;
6120 }
6121 }
6122
6123
6124 /* ------------------------------------------------------------------------ */
6125 /* Function: nat_log */
6126 /* Returns: Nil */
6127 /* Parameters: softc(I) - pointer to soft context main structure */
6128 /* softn(I) - pointer to NAT context structure */
6129 /* nat(I) - pointer to NAT structure */
6130 /* action(I) - action related to NAT structure being performed */
6131 /* */
6132 /* Creates a NAT log entry. */
6133 /* ------------------------------------------------------------------------ */
6134 void
ipf_nat_log(softc,softn,nat,action)6135 ipf_nat_log(softc, softn, nat, action)
6136 ipf_main_softc_t *softc;
6137 ipf_nat_softc_t *softn;
6138 struct nat *nat;
6139 u_int action;
6140 {
6141 #ifdef IPFILTER_LOG
6142 # ifndef LARGE_NAT
6143 struct ipnat *np;
6144 int rulen;
6145 # endif
6146 struct natlog natl;
6147 void *items[1];
6148 size_t sizes[1];
6149 int types[1];
6150
6151 bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip,
6152 sizeof(natl.nl_osrcip));
6153 bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip,
6154 sizeof(natl.nl_nsrcip));
6155 bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip,
6156 sizeof(natl.nl_odstip));
6157 bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip,
6158 sizeof(natl.nl_ndstip));
6159
6160 natl.nl_bytes[0] = nat->nat_bytes[0];
6161 natl.nl_bytes[1] = nat->nat_bytes[1];
6162 natl.nl_pkts[0] = nat->nat_pkts[0];
6163 natl.nl_pkts[1] = nat->nat_pkts[1];
6164 natl.nl_odstport = nat->nat_odport;
6165 natl.nl_osrcport = nat->nat_osport;
6166 natl.nl_nsrcport = nat->nat_nsport;
6167 natl.nl_ndstport = nat->nat_ndport;
6168 natl.nl_p[0] = nat->nat_pr[0];
6169 natl.nl_p[1] = nat->nat_pr[1];
6170 natl.nl_v[0] = nat->nat_v[0];
6171 natl.nl_v[1] = nat->nat_v[1];
6172 natl.nl_type = nat->nat_redir;
6173 natl.nl_action = action;
6174 natl.nl_rule = -1;
6175
6176 bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0],
6177 sizeof(nat->nat_ifnames[0]));
6178 bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1],
6179 sizeof(nat->nat_ifnames[1]));
6180
6181 # ifndef LARGE_NAT
6182 if (nat->nat_ptr != NULL) {
6183 for (rulen = 0, np = softn->ipf_nat_list; np != NULL;
6184 np = np->in_next, rulen++)
6185 if (np == nat->nat_ptr) {
6186 natl.nl_rule = rulen;
6187 break;
6188 }
6189 }
6190 # endif
6191 items[0] = &natl;
6192 sizes[0] = sizeof(natl);
6193 types[0] = 0;
6194
6195 (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1);
6196 #endif
6197 }
6198
6199
6200
6201
6202 /* ------------------------------------------------------------------------ */
6203 /* Function: ipf_nat_rule_deref */
6204 /* Returns: Nil */
6205 /* Parameters: softc(I) - pointer to soft context main structure */
6206 /* inp(I) - pointer to pointer to NAT rule */
6207 /* Write Locks: ipf_nat */
6208 /* */
6209 /* Dropping the refernce count for a rule means that whatever held the */
6210 /* pointer to this rule (*inp) is no longer interested in it and when the */
6211 /* reference count drops to zero, any resources allocated for the rule can */
6212 /* be released and the rule itself free'd. */
6213 /* ------------------------------------------------------------------------ */
6214 void
ipf_nat_rule_deref(softc,inp)6215 ipf_nat_rule_deref(softc, inp)
6216 ipf_main_softc_t *softc;
6217 ipnat_t **inp;
6218 {
6219 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6220 ipnat_t *n;
6221
6222 n = *inp;
6223 *inp = NULL;
6224 n->in_use--;
6225 if (n->in_use > 0)
6226 return;
6227
6228 if (n->in_apr != NULL)
6229 ipf_proxy_deref(n->in_apr);
6230
6231 ipf_nat_rule_fini(softc, n);
6232
6233 if (n->in_redir & NAT_REDIRECT) {
6234 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6235 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr);
6236 }
6237 }
6238 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) {
6239 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6240 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map);
6241 }
6242 }
6243
6244 if (n->in_tqehead[0] != NULL) {
6245 if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) {
6246 ipf_freetimeoutqueue(softc, n->in_tqehead[1]);
6247 }
6248 }
6249
6250 if (n->in_tqehead[1] != NULL) {
6251 if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) {
6252 ipf_freetimeoutqueue(softc, n->in_tqehead[1]);
6253 }
6254 }
6255
6256 if ((n->in_flags & IPN_PROXYRULE) == 0) {
6257 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules);
6258 }
6259
6260 MUTEX_DESTROY(&n->in_lock);
6261
6262 KFREES(n, n->in_size);
6263
6264 #if SOLARIS && !defined(INSTANCES)
6265 if (softn->ipf_nat_stats.ns_rules == 0)
6266 pfil_delayed_copy = 1;
6267 #endif
6268 }
6269
6270
6271 /* ------------------------------------------------------------------------ */
6272 /* Function: ipf_nat_deref */
6273 /* Returns: Nil */
6274 /* Parameters: softc(I) - pointer to soft context main structure */
6275 /* natp(I) - pointer to pointer to NAT table entry */
6276 /* */
6277 /* Decrement the reference counter for this NAT table entry and free it if */
6278 /* there are no more things using it. */
6279 /* */
6280 /* IF nat_ref == 1 when this function is called, then we have an orphan nat */
6281 /* structure *because* it only gets called on paths _after_ nat_ref has been*/
6282 /* incremented. If nat_ref == 1 then we shouldn't decrement it here */
6283 /* because nat_delete() will do that and send nat_ref to -1. */
6284 /* */
6285 /* Holding the lock on nat_lock is required to serialise nat_delete() being */
6286 /* called from a NAT flush ioctl with a deref happening because of a packet.*/
6287 /* ------------------------------------------------------------------------ */
6288 void
ipf_nat_deref(softc,natp)6289 ipf_nat_deref(softc, natp)
6290 ipf_main_softc_t *softc;
6291 nat_t **natp;
6292 {
6293 nat_t *nat;
6294
6295 nat = *natp;
6296 *natp = NULL;
6297
6298 MUTEX_ENTER(&nat->nat_lock);
6299 if (nat->nat_ref > 1) {
6300 nat->nat_ref--;
6301 ASSERT(nat->nat_ref >= 0);
6302 MUTEX_EXIT(&nat->nat_lock);
6303 return;
6304 }
6305 MUTEX_EXIT(&nat->nat_lock);
6306
6307 WRITE_ENTER(&softc->ipf_nat);
6308 ipf_nat_delete(softc, nat, NL_EXPIRE);
6309 RWLOCK_EXIT(&softc->ipf_nat);
6310 }
6311
6312
6313 /* ------------------------------------------------------------------------ */
6314 /* Function: ipf_nat_clone */
6315 /* Returns: ipstate_t* - NULL == cloning failed, */
6316 /* else pointer to new state structure */
6317 /* Parameters: fin(I) - pointer to packet information */
6318 /* is(I) - pointer to master state structure */
6319 /* Write Lock: ipf_nat */
6320 /* */
6321 /* Create a "duplcate" state table entry from the master. */
6322 /* ------------------------------------------------------------------------ */
6323 nat_t *
ipf_nat_clone(fin,nat)6324 ipf_nat_clone(fin, nat)
6325 fr_info_t *fin;
6326 nat_t *nat;
6327 {
6328 ipf_main_softc_t *softc = fin->fin_main_soft;
6329 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6330 frentry_t *fr;
6331 nat_t *clone;
6332 ipnat_t *np;
6333
6334 KMALLOC(clone, nat_t *);
6335 if (clone == NULL) {
6336 NBUMPSIDED(fin->fin_out, ns_clone_nomem);
6337 return NULL;
6338 }
6339 bcopy((char *)nat, (char *)clone, sizeof(*clone));
6340
6341 MUTEX_NUKE(&clone->nat_lock);
6342
6343 clone->nat_rev = fin->fin_rev;
6344 clone->nat_aps = NULL;
6345 /*
6346 * Initialize all these so that ipf_nat_delete() doesn't cause a crash.
6347 */
6348 clone->nat_tqe.tqe_pnext = NULL;
6349 clone->nat_tqe.tqe_next = NULL;
6350 clone->nat_tqe.tqe_ifq = NULL;
6351 clone->nat_tqe.tqe_parent = clone;
6352
6353 clone->nat_flags &= ~SI_CLONE;
6354 clone->nat_flags |= SI_CLONED;
6355
6356 if (clone->nat_hm)
6357 clone->nat_hm->hm_ref++;
6358
6359 if (ipf_nat_insert(softc, softn, clone) == -1) {
6360 KFREE(clone);
6361 NBUMPSIDED(fin->fin_out, ns_insert_fail);
6362 return NULL;
6363 }
6364
6365 np = clone->nat_ptr;
6366 if (np != NULL) {
6367 if (softn->ipf_nat_logging)
6368 ipf_nat_log(softc, softn, clone, NL_CLONE);
6369 np->in_use++;
6370 }
6371 fr = clone->nat_fr;
6372 if (fr != NULL) {
6373 MUTEX_ENTER(&fr->fr_lock);
6374 fr->fr_ref++;
6375 MUTEX_EXIT(&fr->fr_lock);
6376 }
6377
6378
6379 /*
6380 * Because the clone is created outside the normal loop of things and
6381 * TCP has special needs in terms of state, initialise the timeout
6382 * state of the new NAT from here.
6383 */
6384 if (clone->nat_pr[0] == IPPROTO_TCP) {
6385 (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq,
6386 clone->nat_flags, 2);
6387 }
6388 clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone);
6389 if (softn->ipf_nat_logging)
6390 ipf_nat_log(softc, softn, clone, NL_CLONE);
6391 return clone;
6392 }
6393
6394
6395 /* ------------------------------------------------------------------------ */
6396 /* Function: ipf_nat_wildok */
6397 /* Returns: int - 1 == packet's ports match wildcards */
6398 /* 0 == packet's ports don't match wildcards */
6399 /* Parameters: nat(I) - NAT entry */
6400 /* sport(I) - source port */
6401 /* dport(I) - destination port */
6402 /* flags(I) - wildcard flags */
6403 /* dir(I) - packet direction */
6404 /* */
6405 /* Use NAT entry and packet direction to determine which combination of */
6406 /* wildcard flags should be used. */
6407 /* ------------------------------------------------------------------------ */
6408 int
ipf_nat_wildok(nat,sport,dport,flags,dir)6409 ipf_nat_wildok(nat, sport, dport, flags, dir)
6410 nat_t *nat;
6411 int sport, dport, flags, dir;
6412 {
6413 /*
6414 * When called by dir is set to
6415 * nat_inlookup NAT_INBOUND (0)
6416 * nat_outlookup NAT_OUTBOUND (1)
6417 *
6418 * We simply combine the packet's direction in dir with the original
6419 * "intended" direction of that NAT entry in nat->nat_dir to decide
6420 * which combination of wildcard flags to allow.
6421 */
6422 switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)))
6423 {
6424 case 3: /* outbound packet / outbound entry */
6425 if (((nat->nat_osport == sport) ||
6426 (flags & SI_W_SPORT)) &&
6427 ((nat->nat_odport == dport) ||
6428 (flags & SI_W_DPORT)))
6429 return 1;
6430 break;
6431 case 2: /* outbound packet / inbound entry */
6432 if (((nat->nat_osport == dport) ||
6433 (flags & SI_W_SPORT)) &&
6434 ((nat->nat_odport == sport) ||
6435 (flags & SI_W_DPORT)))
6436 return 1;
6437 break;
6438 case 1: /* inbound packet / outbound entry */
6439 if (((nat->nat_osport == dport) ||
6440 (flags & SI_W_SPORT)) &&
6441 ((nat->nat_odport == sport) ||
6442 (flags & SI_W_DPORT)))
6443 return 1;
6444 break;
6445 case 0: /* inbound packet / inbound entry */
6446 if (((nat->nat_osport == sport) ||
6447 (flags & SI_W_SPORT)) &&
6448 ((nat->nat_odport == dport) ||
6449 (flags & SI_W_DPORT)))
6450 return 1;
6451 break;
6452 default:
6453 break;
6454 }
6455
6456 return(0);
6457 }
6458
6459
6460 /* ------------------------------------------------------------------------ */
6461 /* Function: nat_mssclamp */
6462 /* Returns: Nil */
6463 /* Parameters: tcp(I) - pointer to TCP header */
6464 /* maxmss(I) - value to clamp the TCP MSS to */
6465 /* fin(I) - pointer to packet information */
6466 /* csump(I) - pointer to TCP checksum */
6467 /* */
6468 /* Check for MSS option and clamp it if necessary. If found and changed, */
6469 /* then the TCP header checksum will be updated to reflect the change in */
6470 /* the MSS. */
6471 /* ------------------------------------------------------------------------ */
6472 static void
ipf_nat_mssclamp(tcp,maxmss,fin,csump)6473 ipf_nat_mssclamp(tcp, maxmss, fin, csump)
6474 tcphdr_t *tcp;
6475 u_32_t maxmss;
6476 fr_info_t *fin;
6477 u_short *csump;
6478 {
6479 u_char *cp, *ep, opt;
6480 int hlen, advance;
6481 u_32_t mss, sumd;
6482
6483 hlen = TCP_OFF(tcp) << 2;
6484 if (hlen > sizeof(*tcp)) {
6485 cp = (u_char *)tcp + sizeof(*tcp);
6486 ep = (u_char *)tcp + hlen;
6487
6488 while (cp < ep) {
6489 opt = cp[0];
6490 if (opt == TCPOPT_EOL)
6491 break;
6492 else if (opt == TCPOPT_NOP) {
6493 cp++;
6494 continue;
6495 }
6496
6497 if (cp + 1 >= ep)
6498 break;
6499 advance = cp[1];
6500 if ((cp + advance > ep) || (advance <= 0))
6501 break;
6502 switch (opt)
6503 {
6504 case TCPOPT_MAXSEG:
6505 if (advance != 4)
6506 break;
6507 mss = cp[2] * 256 + cp[3];
6508 if (mss > maxmss) {
6509 cp[2] = maxmss / 256;
6510 cp[3] = maxmss & 0xff;
6511 CALC_SUMD(mss, maxmss, sumd);
6512 ipf_fix_outcksum(0, csump, sumd, 0);
6513 }
6514 break;
6515 default:
6516 /* ignore unknown options */
6517 break;
6518 }
6519
6520 cp += advance;
6521 }
6522 }
6523 }
6524
6525
6526 /* ------------------------------------------------------------------------ */
6527 /* Function: ipf_nat_setqueue */
6528 /* Returns: Nil */
6529 /* Parameters: softc(I) - pointer to soft context main structure */
6530 /* softn(I) - pointer to NAT context structure */
6531 /* nat(I)- pointer to NAT structure */
6532 /* Locks: ipf_nat (read or write) */
6533 /* */
6534 /* Put the NAT entry on its default queue entry, using rev as a helped in */
6535 /* determining which queue it should be placed on. */
6536 /* ------------------------------------------------------------------------ */
6537 void
ipf_nat_setqueue(softc,softn,nat)6538 ipf_nat_setqueue(softc, softn, nat)
6539 ipf_main_softc_t *softc;
6540 ipf_nat_softc_t *softn;
6541 nat_t *nat;
6542 {
6543 ipftq_t *oifq, *nifq;
6544 int rev = nat->nat_rev;
6545
6546 if (nat->nat_ptr != NULL)
6547 nifq = nat->nat_ptr->in_tqehead[rev];
6548 else
6549 nifq = NULL;
6550
6551 if (nifq == NULL) {
6552 switch (nat->nat_pr[0])
6553 {
6554 case IPPROTO_UDP :
6555 nifq = &softn->ipf_nat_udptq;
6556 break;
6557 case IPPROTO_ICMP :
6558 nifq = &softn->ipf_nat_icmptq;
6559 break;
6560 case IPPROTO_TCP :
6561 nifq = softn->ipf_nat_tcptq +
6562 nat->nat_tqe.tqe_state[rev];
6563 break;
6564 default :
6565 nifq = &softn->ipf_nat_iptq;
6566 break;
6567 }
6568 }
6569
6570 oifq = nat->nat_tqe.tqe_ifq;
6571 /*
6572 * If it's currently on a timeout queue, move it from one queue to
6573 * another, else put it on the end of the newly determined queue.
6574 */
6575 if (oifq != NULL)
6576 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq);
6577 else
6578 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat);
6579 return;
6580 }
6581
6582
6583 /* ------------------------------------------------------------------------ */
6584 /* Function: nat_getnext */
6585 /* Returns: int - 0 == ok, else error */
6586 /* Parameters: softc(I) - pointer to soft context main structure */
6587 /* t(I) - pointer to ipftoken structure */
6588 /* itp(I) - pointer to ipfgeniter_t structure */
6589 /* */
6590 /* Fetch the next nat/ipnat structure pointer from the linked list and */
6591 /* copy it out to the storage space pointed to by itp_data. The next item */
6592 /* in the list to look at is put back in the ipftoken struture. */
6593 /* ------------------------------------------------------------------------ */
6594 static int
ipf_nat_getnext(softc,t,itp,objp)6595 ipf_nat_getnext(softc, t, itp, objp)
6596 ipf_main_softc_t *softc;
6597 ipftoken_t *t;
6598 ipfgeniter_t *itp;
6599 ipfobj_t *objp;
6600 {
6601 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6602 hostmap_t *hm, *nexthm = NULL, zerohm;
6603 ipnat_t *ipn, *nextipnat = NULL, zeroipn;
6604 nat_t *nat, *nextnat = NULL, zeronat;
6605 int error = 0;
6606 void *nnext;
6607
6608 if (itp->igi_nitems != 1) {
6609 IPFERROR(60075);
6610 return ENOSPC;
6611 }
6612
6613 READ_ENTER(&softc->ipf_nat);
6614
6615 switch (itp->igi_type)
6616 {
6617 case IPFGENITER_HOSTMAP :
6618 hm = t->ipt_data;
6619 if (hm == NULL) {
6620 nexthm = softn->ipf_hm_maplist;
6621 } else {
6622 nexthm = hm->hm_next;
6623 }
6624 if (nexthm != NULL) {
6625 ATOMIC_INC32(nexthm->hm_ref);
6626 t->ipt_data = nexthm;
6627 } else {
6628 bzero(&zerohm, sizeof(zerohm));
6629 nexthm = &zerohm;
6630 t->ipt_data = NULL;
6631 }
6632 nnext = nexthm->hm_next;
6633 break;
6634
6635 case IPFGENITER_IPNAT :
6636 ipn = t->ipt_data;
6637 if (ipn == NULL) {
6638 nextipnat = softn->ipf_nat_list;
6639 } else {
6640 nextipnat = ipn->in_next;
6641 }
6642 if (nextipnat != NULL) {
6643 ATOMIC_INC32(nextipnat->in_use);
6644 t->ipt_data = nextipnat;
6645 } else {
6646 bzero(&zeroipn, sizeof(zeroipn));
6647 nextipnat = &zeroipn;
6648 t->ipt_data = NULL;
6649 }
6650 nnext = nextipnat->in_next;
6651 break;
6652
6653 case IPFGENITER_NAT :
6654 nat = t->ipt_data;
6655 if (nat == NULL) {
6656 nextnat = softn->ipf_nat_instances;
6657 } else {
6658 nextnat = nat->nat_next;
6659 }
6660 if (nextnat != NULL) {
6661 MUTEX_ENTER(&nextnat->nat_lock);
6662 nextnat->nat_ref++;
6663 MUTEX_EXIT(&nextnat->nat_lock);
6664 t->ipt_data = nextnat;
6665 } else {
6666 bzero(&zeronat, sizeof(zeronat));
6667 nextnat = &zeronat;
6668 t->ipt_data = NULL;
6669 }
6670 nnext = nextnat->nat_next;
6671 break;
6672
6673 default :
6674 RWLOCK_EXIT(&softc->ipf_nat);
6675 IPFERROR(60055);
6676 return EINVAL;
6677 }
6678
6679 RWLOCK_EXIT(&softc->ipf_nat);
6680
6681 objp->ipfo_ptr = itp->igi_data;
6682
6683 switch (itp->igi_type)
6684 {
6685 case IPFGENITER_HOSTMAP :
6686 error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm));
6687 if (error != 0) {
6688 IPFERROR(60049);
6689 error = EFAULT;
6690 }
6691 if (hm != NULL) {
6692 WRITE_ENTER(&softc->ipf_nat);
6693 ipf_nat_hostmapdel(softc, &hm);
6694 RWLOCK_EXIT(&softc->ipf_nat);
6695 }
6696 break;
6697
6698 case IPFGENITER_IPNAT :
6699 objp->ipfo_size = nextipnat->in_size;
6700 objp->ipfo_type = IPFOBJ_IPNAT;
6701 error = ipf_outobjk(softc, objp, nextipnat);
6702 if (ipn != NULL) {
6703 WRITE_ENTER(&softc->ipf_nat);
6704 ipf_nat_rule_deref(softc, &ipn);
6705 RWLOCK_EXIT(&softc->ipf_nat);
6706 }
6707 break;
6708
6709 case IPFGENITER_NAT :
6710 objp->ipfo_size = sizeof(nat_t);
6711 objp->ipfo_type = IPFOBJ_NAT;
6712 error = ipf_outobjk(softc, objp, nextnat);
6713 if (nat != NULL)
6714 ipf_nat_deref(softc, &nat);
6715
6716 break;
6717 }
6718
6719 if (nnext == NULL)
6720 ipf_token_mark_complete(t);
6721
6722 return error;
6723 }
6724
6725
6726 /* ------------------------------------------------------------------------ */
6727 /* Function: nat_extraflush */
6728 /* Returns: int - 0 == success, -1 == failure */
6729 /* Parameters: softc(I) - pointer to soft context main structure */
6730 /* softn(I) - pointer to NAT context structure */
6731 /* which(I) - how to flush the active NAT table */
6732 /* Write Locks: ipf_nat */
6733 /* */
6734 /* Flush nat tables. Three actions currently defined: */
6735 /* which == 0 : flush all nat table entries */
6736 /* which == 1 : flush TCP connections which have started to close but are */
6737 /* stuck for some reason. */
6738 /* which == 2 : flush TCP connections which have been idle for a long time, */
6739 /* starting at > 4 days idle and working back in successive half-*/
6740 /* days to at most 12 hours old. If this fails to free enough */
6741 /* slots then work backwards in half hour slots to 30 minutes. */
6742 /* If that too fails, then work backwards in 30 second intervals */
6743 /* for the last 30 minutes to at worst 30 seconds idle. */
6744 /* ------------------------------------------------------------------------ */
6745 static int
ipf_nat_extraflush(softc,softn,which)6746 ipf_nat_extraflush(softc, softn, which)
6747 ipf_main_softc_t *softc;
6748 ipf_nat_softc_t *softn;
6749 int which;
6750 {
6751 nat_t *nat, **natp;
6752 ipftqent_t *tqn;
6753 ipftq_t *ifq;
6754 int removed;
6755 SPL_INT(s);
6756
6757 removed = 0;
6758
6759 SPL_NET(s);
6760 switch (which)
6761 {
6762 case 0 :
6763 softn->ipf_nat_stats.ns_flush_all++;
6764 /*
6765 * Style 0 flush removes everything...
6766 */
6767 for (natp = &softn->ipf_nat_instances;
6768 ((nat = *natp) != NULL); ) {
6769 ipf_nat_delete(softc, nat, NL_FLUSH);
6770 removed++;
6771 }
6772 break;
6773
6774 case 1 :
6775 softn->ipf_nat_stats.ns_flush_closing++;
6776 /*
6777 * Since we're only interested in things that are closing,
6778 * we can start with the appropriate timeout queue.
6779 */
6780 for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT;
6781 ifq != NULL; ifq = ifq->ifq_next) {
6782
6783 for (tqn = ifq->ifq_head; tqn != NULL; ) {
6784 nat = tqn->tqe_parent;
6785 tqn = tqn->tqe_next;
6786 if (nat->nat_pr[0] != IPPROTO_TCP ||
6787 nat->nat_pr[1] != IPPROTO_TCP)
6788 break;
6789 ipf_nat_delete(softc, nat, NL_EXPIRE);
6790 removed++;
6791 }
6792 }
6793
6794 /*
6795 * Also need to look through the user defined queues.
6796 */
6797 for (ifq = softn->ipf_nat_utqe; ifq != NULL;
6798 ifq = ifq->ifq_next) {
6799 for (tqn = ifq->ifq_head; tqn != NULL; ) {
6800 nat = tqn->tqe_parent;
6801 tqn = tqn->tqe_next;
6802 if (nat->nat_pr[0] != IPPROTO_TCP ||
6803 nat->nat_pr[1] != IPPROTO_TCP)
6804 continue;
6805
6806 if ((nat->nat_tcpstate[0] >
6807 IPF_TCPS_ESTABLISHED) &&
6808 (nat->nat_tcpstate[1] >
6809 IPF_TCPS_ESTABLISHED)) {
6810 ipf_nat_delete(softc, nat, NL_EXPIRE);
6811 removed++;
6812 }
6813 }
6814 }
6815 break;
6816
6817 /*
6818 * Args 5-11 correspond to flushing those particular states
6819 * for TCP connections.
6820 */
6821 case IPF_TCPS_CLOSE_WAIT :
6822 case IPF_TCPS_FIN_WAIT_1 :
6823 case IPF_TCPS_CLOSING :
6824 case IPF_TCPS_LAST_ACK :
6825 case IPF_TCPS_FIN_WAIT_2 :
6826 case IPF_TCPS_TIME_WAIT :
6827 case IPF_TCPS_CLOSED :
6828 softn->ipf_nat_stats.ns_flush_state++;
6829 tqn = softn->ipf_nat_tcptq[which].ifq_head;
6830 while (tqn != NULL) {
6831 nat = tqn->tqe_parent;
6832 tqn = tqn->tqe_next;
6833 ipf_nat_delete(softc, nat, NL_FLUSH);
6834 removed++;
6835 }
6836 break;
6837
6838 default :
6839 if (which < 30)
6840 break;
6841
6842 softn->ipf_nat_stats.ns_flush_timeout++;
6843 /*
6844 * Take a large arbitrary number to mean the number of seconds
6845 * for which which consider to be the maximum value we'll allow
6846 * the expiration to be.
6847 */
6848 which = IPF_TTLVAL(which);
6849 for (natp = &softn->ipf_nat_instances;
6850 ((nat = *natp) != NULL); ) {
6851 if (softc->ipf_ticks - nat->nat_touched > which) {
6852 ipf_nat_delete(softc, nat, NL_FLUSH);
6853 removed++;
6854 } else
6855 natp = &nat->nat_next;
6856 }
6857 break;
6858 }
6859
6860 if (which != 2) {
6861 SPL_X(s);
6862 return removed;
6863 }
6864
6865 softn->ipf_nat_stats.ns_flush_queue++;
6866
6867 /*
6868 * Asked to remove inactive entries because the table is full, try
6869 * again, 3 times, if first attempt failed with a different criteria
6870 * each time. The order tried in must be in decreasing age.
6871 * Another alternative is to implement random drop and drop N entries
6872 * at random until N have been freed up.
6873 */
6874 if (softc->ipf_ticks - softn->ipf_nat_last_force_flush >
6875 IPF_TTLVAL(5)) {
6876 softn->ipf_nat_last_force_flush = softc->ipf_ticks;
6877
6878 removed = ipf_queueflush(softc, ipf_nat_flush_entry,
6879 softn->ipf_nat_tcptq,
6880 softn->ipf_nat_utqe,
6881 &softn->ipf_nat_stats.ns_active,
6882 softn->ipf_nat_table_sz,
6883 softn->ipf_nat_table_wm_low);
6884 }
6885
6886 SPL_X(s);
6887 return removed;
6888 }
6889
6890
6891 /* ------------------------------------------------------------------------ */
6892 /* Function: ipf_nat_flush_entry */
6893 /* Returns: 0 - always succeeds */
6894 /* Parameters: softc(I) - pointer to soft context main structure */
6895 /* entry(I) - pointer to NAT entry */
6896 /* Write Locks: ipf_nat */
6897 /* */
6898 /* This function is a stepping stone between ipf_queueflush() and */
6899 /* nat_dlete(). It is used so we can provide a uniform interface via the */
6900 /* ipf_queueflush() function. Since the nat_delete() function returns void */
6901 /* we translate that to mean it always succeeds in deleting something. */
6902 /* ------------------------------------------------------------------------ */
6903 static int
ipf_nat_flush_entry(softc,entry)6904 ipf_nat_flush_entry(softc, entry)
6905 ipf_main_softc_t *softc;
6906 void *entry;
6907 {
6908 ipf_nat_delete(softc, entry, NL_FLUSH);
6909 return 0;
6910 }
6911
6912
6913 /* ------------------------------------------------------------------------ */
6914 /* Function: ipf_nat_iterator */
6915 /* Returns: int - 0 == ok, else error */
6916 /* Parameters: softc(I) - pointer to soft context main structure */
6917 /* token(I) - pointer to ipftoken structure */
6918 /* itp(I) - pointer to ipfgeniter_t structure */
6919 /* obj(I) - pointer to data description structure */
6920 /* */
6921 /* This function acts as a handler for the SIOCGENITER ioctls that use a */
6922 /* generic structure to iterate through a list. There are three different */
6923 /* linked lists of NAT related information to go through: NAT rules, active */
6924 /* NAT mappings and the NAT fragment cache. */
6925 /* ------------------------------------------------------------------------ */
6926 static int
ipf_nat_iterator(softc,token,itp,obj)6927 ipf_nat_iterator(softc, token, itp, obj)
6928 ipf_main_softc_t *softc;
6929 ipftoken_t *token;
6930 ipfgeniter_t *itp;
6931 ipfobj_t *obj;
6932 {
6933 int error;
6934
6935 if (itp->igi_data == NULL) {
6936 IPFERROR(60052);
6937 return EFAULT;
6938 }
6939
6940 switch (itp->igi_type)
6941 {
6942 case IPFGENITER_HOSTMAP :
6943 case IPFGENITER_IPNAT :
6944 case IPFGENITER_NAT :
6945 error = ipf_nat_getnext(softc, token, itp, obj);
6946 break;
6947
6948 case IPFGENITER_NATFRAG :
6949 error = ipf_frag_nat_next(softc, token, itp);
6950 break;
6951 default :
6952 IPFERROR(60053);
6953 error = EINVAL;
6954 break;
6955 }
6956
6957 return error;
6958 }
6959
6960
6961 /* ------------------------------------------------------------------------ */
6962 /* Function: ipf_nat_setpending */
6963 /* Returns: Nil */
6964 /* Parameters: softc(I) - pointer to soft context main structure */
6965 /* nat(I) - pointer to NAT structure */
6966 /* Locks: ipf_nat (read or write) */
6967 /* */
6968 /* Put the NAT entry on to the pending queue - this queue has a very short */
6969 /* lifetime where items are put that can't be deleted straight away because */
6970 /* of locking issues but we want to delete them ASAP, anyway. In calling */
6971 /* this function, it is assumed that the owner (if there is one, as shown */
6972 /* by nat_me) is no longer interested in it. */
6973 /* ------------------------------------------------------------------------ */
6974 void
ipf_nat_setpending(softc,nat)6975 ipf_nat_setpending(softc, nat)
6976 ipf_main_softc_t *softc;
6977 nat_t *nat;
6978 {
6979 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
6980 ipftq_t *oifq;
6981
6982 oifq = nat->nat_tqe.tqe_ifq;
6983 if (oifq != NULL)
6984 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq,
6985 &softn->ipf_nat_pending);
6986 else
6987 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe,
6988 &softn->ipf_nat_pending, nat);
6989
6990 if (nat->nat_me != NULL) {
6991 *nat->nat_me = NULL;
6992 nat->nat_me = NULL;
6993 nat->nat_ref--;
6994 ASSERT(nat->nat_ref >= 0);
6995 }
6996 }
6997
6998
6999 /* ------------------------------------------------------------------------ */
7000 /* Function: nat_newrewrite */
7001 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */
7002 /* allow rule to be moved if IPN_ROUNDR is set. */
7003 /* Parameters: fin(I) - pointer to packet information */
7004 /* nat(I) - pointer to NAT entry */
7005 /* ni(I) - pointer to structure with misc. information needed */
7006 /* to create new NAT entry. */
7007 /* Write Lock: ipf_nat */
7008 /* */
7009 /* This function is responsible for setting up an active NAT session where */
7010 /* we are changing both the source and destination parameters at the same */
7011 /* time. The loop in here works differently to elsewhere - each iteration */
7012 /* is responsible for changing a single parameter that can be incremented. */
7013 /* So one pass may increase the source IP#, next source port, next dest. IP#*/
7014 /* and the last destination port for a total of 4 iterations to try each. */
7015 /* This is done to try and exhaustively use the translation space available.*/
7016 /* ------------------------------------------------------------------------ */
7017 static int
ipf_nat_newrewrite(fin,nat,nai)7018 ipf_nat_newrewrite(fin, nat, nai)
7019 fr_info_t *fin;
7020 nat_t *nat;
7021 natinfo_t *nai;
7022 {
7023 int src_search = 1;
7024 int dst_search = 1;
7025 fr_info_t frnat;
7026 u_32_t flags;
7027 u_short swap;
7028 ipnat_t *np;
7029 nat_t *natl;
7030 int l = 0;
7031 int changed;
7032
7033 natl = NULL;
7034 changed = -1;
7035 np = nai->nai_np;
7036 flags = nat->nat_flags;
7037 bcopy((char *)fin, (char *)&frnat, sizeof(*fin));
7038
7039 nat->nat_hm = NULL;
7040
7041 do {
7042 changed = -1;
7043 /* TRACE (l, src_search, dst_search, np) */
7044 DT4(ipf_nat_rewrite_1, int, l, int, src_search, int, dst_search, ipnat_t *, np);
7045
7046 if ((src_search == 0) && (np->in_spnext == 0) &&
7047 (dst_search == 0) && (np->in_dpnext == 0)) {
7048 if (l > 0)
7049 return -1;
7050 }
7051
7052 /*
7053 * Find a new source address
7054 */
7055 if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr,
7056 &frnat.fin_saddr) == -1) {
7057 return -1;
7058 }
7059
7060 if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) {
7061 src_search = 0;
7062 if (np->in_stepnext == 0)
7063 np->in_stepnext = 1;
7064
7065 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) {
7066 src_search = 0;
7067 if (np->in_stepnext == 0)
7068 np->in_stepnext = 1;
7069
7070 } else if (np->in_nsrcmsk == 0xffffffff) {
7071 src_search = 0;
7072 if (np->in_stepnext == 0)
7073 np->in_stepnext = 1;
7074
7075 } else if (np->in_nsrcmsk != 0xffffffff) {
7076 if (np->in_stepnext == 0 && changed == -1) {
7077 np->in_snip++;
7078 np->in_stepnext++;
7079 changed = 0;
7080 }
7081 }
7082
7083 if ((flags & IPN_TCPUDPICMP) != 0) {
7084 if (np->in_spnext != 0)
7085 frnat.fin_data[0] = np->in_spnext;
7086
7087 /*
7088 * Standard port translation. Select next port.
7089 */
7090 if ((flags & IPN_FIXEDSPORT) != 0) {
7091 np->in_stepnext = 2;
7092 } else if ((np->in_stepnext == 1) &&
7093 (changed == -1) && (natl != NULL)) {
7094 np->in_spnext++;
7095 np->in_stepnext++;
7096 changed = 1;
7097 if (np->in_spnext > np->in_spmax)
7098 np->in_spnext = np->in_spmin;
7099 }
7100 } else {
7101 np->in_stepnext = 2;
7102 }
7103 np->in_stepnext &= 0x3;
7104
7105 /*
7106 * Find a new destination address
7107 */
7108 /* TRACE (fin, np, l, frnat) */
7109 DT4(ipf_nat_rewrite_2, frinfo_t *, fin, ipnat_t *, np, int, l, frinfo_t *, &frnat);
7110
7111 if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr,
7112 &frnat.fin_daddr) == -1)
7113 return -1;
7114 if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) {
7115 dst_search = 0;
7116 if (np->in_stepnext == 2)
7117 np->in_stepnext = 3;
7118
7119 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) {
7120 dst_search = 0;
7121 if (np->in_stepnext == 2)
7122 np->in_stepnext = 3;
7123
7124 } else if (np->in_ndstmsk == 0xffffffff) {
7125 dst_search = 0;
7126 if (np->in_stepnext == 2)
7127 np->in_stepnext = 3;
7128
7129 } else if (np->in_ndstmsk != 0xffffffff) {
7130 if ((np->in_stepnext == 2) && (changed == -1) &&
7131 (natl != NULL)) {
7132 changed = 2;
7133 np->in_stepnext++;
7134 np->in_dnip++;
7135 }
7136 }
7137
7138 if ((flags & IPN_TCPUDPICMP) != 0) {
7139 if (np->in_dpnext != 0)
7140 frnat.fin_data[1] = np->in_dpnext;
7141
7142 /*
7143 * Standard port translation. Select next port.
7144 */
7145 if ((flags & IPN_FIXEDDPORT) != 0) {
7146 np->in_stepnext = 0;
7147 } else if (np->in_stepnext == 3 && changed == -1) {
7148 np->in_dpnext++;
7149 np->in_stepnext++;
7150 changed = 3;
7151 if (np->in_dpnext > np->in_dpmax)
7152 np->in_dpnext = np->in_dpmin;
7153 }
7154 } else {
7155 if (np->in_stepnext == 3)
7156 np->in_stepnext = 0;
7157 }
7158
7159 /* TRACE (frnat) */
7160 DT1(ipf_nat_rewrite_3, frinfo_t *, &frnat);
7161
7162 /*
7163 * Here we do a lookup of the connection as seen from
7164 * the outside. If an IP# pair already exists, try
7165 * again. So if you have A->B becomes C->B, you can
7166 * also have D->E become C->E but not D->B causing
7167 * another C->B. Also take protocol and ports into
7168 * account when determining whether a pre-existing
7169 * NAT setup will cause an external conflict where
7170 * this is appropriate.
7171 *
7172 * fin_data[] is swapped around because we are doing a
7173 * lookup of the packet is if it were moving in the opposite
7174 * direction of the one we are working with now.
7175 */
7176 if (flags & IPN_TCPUDP) {
7177 swap = frnat.fin_data[0];
7178 frnat.fin_data[0] = frnat.fin_data[1];
7179 frnat.fin_data[1] = swap;
7180 }
7181 if (fin->fin_out == 1) {
7182 natl = ipf_nat_inlookup(&frnat,
7183 flags & ~(SI_WILDP|NAT_SEARCH),
7184 (u_int)frnat.fin_p,
7185 frnat.fin_dst, frnat.fin_src);
7186
7187 } else {
7188 natl = ipf_nat_outlookup(&frnat,
7189 flags & ~(SI_WILDP|NAT_SEARCH),
7190 (u_int)frnat.fin_p,
7191 frnat.fin_dst, frnat.fin_src);
7192 }
7193 if (flags & IPN_TCPUDP) {
7194 swap = frnat.fin_data[0];
7195 frnat.fin_data[0] = frnat.fin_data[1];
7196 frnat.fin_data[1] = swap;
7197 }
7198
7199 /* TRACE natl, in_stepnext, l */
7200 DT3(ipf_nat_rewrite_2, nat_t *, natl, ipnat_t *, np , int, l);
7201
7202 if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */
7203 return -1;
7204
7205 np->in_stepnext &= 0x3;
7206
7207 l++;
7208 changed = -1;
7209 } while (natl != NULL);
7210
7211 nat->nat_osrcip = fin->fin_src;
7212 nat->nat_odstip = fin->fin_dst;
7213 nat->nat_nsrcip = frnat.fin_src;
7214 nat->nat_ndstip = frnat.fin_dst;
7215
7216 if ((flags & IPN_TCPUDP) != 0) {
7217 nat->nat_osport = htons(fin->fin_data[0]);
7218 nat->nat_odport = htons(fin->fin_data[1]);
7219 nat->nat_nsport = htons(frnat.fin_data[0]);
7220 nat->nat_ndport = htons(frnat.fin_data[1]);
7221 } else if ((flags & IPN_ICMPQUERY) != 0) {
7222 nat->nat_oicmpid = fin->fin_data[1];
7223 nat->nat_nicmpid = frnat.fin_data[1];
7224 }
7225
7226 return 0;
7227 }
7228
7229
7230 /* ------------------------------------------------------------------------ */
7231 /* Function: nat_newdivert */
7232 /* Returns: int - -1 == error, 0 == success */
7233 /* Parameters: fin(I) - pointer to packet information */
7234 /* nat(I) - pointer to NAT entry */
7235 /* ni(I) - pointer to structure with misc. information needed */
7236 /* to create new NAT entry. */
7237 /* Write Lock: ipf_nat */
7238 /* */
7239 /* Create a new NAT divert session as defined by the NAT rule. This is */
7240 /* somewhat different to other NAT session creation routines because we */
7241 /* do not iterate through either port numbers or IP addresses, searching */
7242 /* for a unique mapping, however, a complimentary duplicate check is made. */
7243 /* ------------------------------------------------------------------------ */
7244 static int
ipf_nat_newdivert(fin,nat,nai)7245 ipf_nat_newdivert(fin, nat, nai)
7246 fr_info_t *fin;
7247 nat_t *nat;
7248 natinfo_t *nai;
7249 {
7250 ipf_main_softc_t *softc = fin->fin_main_soft;
7251 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7252 fr_info_t frnat;
7253 ipnat_t *np;
7254 nat_t *natl;
7255 int p;
7256
7257 np = nai->nai_np;
7258 bcopy((char *)fin, (char *)&frnat, sizeof(*fin));
7259
7260 nat->nat_pr[0] = 0;
7261 nat->nat_osrcaddr = fin->fin_saddr;
7262 nat->nat_odstaddr = fin->fin_daddr;
7263 frnat.fin_saddr = htonl(np->in_snip);
7264 frnat.fin_daddr = htonl(np->in_dnip);
7265 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
7266 nat->nat_osport = htons(fin->fin_data[0]);
7267 nat->nat_odport = htons(fin->fin_data[1]);
7268 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
7269 nat->nat_oicmpid = fin->fin_data[1];
7270 }
7271
7272 if (np->in_redir & NAT_DIVERTUDP) {
7273 frnat.fin_data[0] = np->in_spnext;
7274 frnat.fin_data[1] = np->in_dpnext;
7275 frnat.fin_flx |= FI_TCPUDP;
7276 p = IPPROTO_UDP;
7277 } else {
7278 frnat.fin_flx &= ~FI_TCPUDP;
7279 p = IPPROTO_IPIP;
7280 }
7281
7282 if (fin->fin_out == 1) {
7283 natl = ipf_nat_inlookup(&frnat, 0, p,
7284 frnat.fin_dst, frnat.fin_src);
7285
7286 } else {
7287 natl = ipf_nat_outlookup(&frnat, 0, p,
7288 frnat.fin_dst, frnat.fin_src);
7289 }
7290
7291 if (natl != NULL) {
7292 NBUMPSIDED(fin->fin_out, ns_divert_exist);
7293 DT3(ns_divert_exist, fr_info_t *, fin, nat_t *, nat, natinfo_t, nai);
7294 return -1;
7295 }
7296
7297 nat->nat_nsrcaddr = frnat.fin_saddr;
7298 nat->nat_ndstaddr = frnat.fin_daddr;
7299 if ((nat->nat_flags & IPN_TCPUDP) != 0) {
7300 nat->nat_nsport = htons(frnat.fin_data[0]);
7301 nat->nat_ndport = htons(frnat.fin_data[1]);
7302 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) {
7303 nat->nat_nicmpid = frnat.fin_data[1];
7304 }
7305
7306 nat->nat_pr[fin->fin_out] = fin->fin_p;
7307 nat->nat_pr[1 - fin->fin_out] = p;
7308
7309 if (np->in_redir & NAT_REDIRECT)
7310 nat->nat_dir = NAT_DIVERTIN;
7311 else
7312 nat->nat_dir = NAT_DIVERTOUT;
7313
7314 return 0;
7315 }
7316
7317
7318 /* ------------------------------------------------------------------------ */
7319 /* Function: nat_builddivertmp */
7320 /* Returns: int - -1 == error, 0 == success */
7321 /* Parameters: softn(I) - pointer to NAT context structure */
7322 /* np(I) - pointer to a NAT rule */
7323 /* */
7324 /* For divert rules, a skeleton packet representing what will be prepended */
7325 /* to the real packet is created. Even though we don't have the full */
7326 /* packet here, a checksum is calculated that we update later when we */
7327 /* fill in the final details. At present a 0 checksum for UDP is being set */
7328 /* here because it is expected that divert will be used for localhost. */
7329 /* ------------------------------------------------------------------------ */
7330 static int
ipf_nat_builddivertmp(softn,np)7331 ipf_nat_builddivertmp(softn, np)
7332 ipf_nat_softc_t *softn;
7333 ipnat_t *np;
7334 {
7335 udphdr_t *uh;
7336 size_t len;
7337 ip_t *ip;
7338
7339 if ((np->in_redir & NAT_DIVERTUDP) != 0)
7340 len = sizeof(ip_t) + sizeof(udphdr_t);
7341 else
7342 len = sizeof(ip_t);
7343
7344 ALLOC_MB_T(np->in_divmp, len);
7345 if (np->in_divmp == NULL) {
7346 NBUMPD(ipf_nat_stats, ns_divert_build);
7347 return -1;
7348 }
7349
7350 /*
7351 * First, the header to get the packet diverted to the new destination
7352 */
7353 ip = MTOD(np->in_divmp, ip_t *);
7354 IP_V_A(ip, 4);
7355 IP_HL_A(ip, 5);
7356 ip->ip_tos = 0;
7357 if ((np->in_redir & NAT_DIVERTUDP) != 0)
7358 ip->ip_p = IPPROTO_UDP;
7359 else
7360 ip->ip_p = IPPROTO_IPIP;
7361 ip->ip_ttl = 255;
7362 ip->ip_off = 0;
7363 ip->ip_sum = 0;
7364 ip->ip_len = htons(len);
7365 ip->ip_id = 0;
7366 ip->ip_src.s_addr = htonl(np->in_snip);
7367 ip->ip_dst.s_addr = htonl(np->in_dnip);
7368 ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip));
7369
7370 if (np->in_redir & NAT_DIVERTUDP) {
7371 uh = (udphdr_t *)(ip + 1);
7372 uh->uh_sum = 0;
7373 uh->uh_ulen = 8;
7374 uh->uh_sport = htons(np->in_spnext);
7375 uh->uh_dport = htons(np->in_dpnext);
7376 }
7377
7378 return 0;
7379 }
7380
7381
7382 #define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t))
7383
7384 /* ------------------------------------------------------------------------ */
7385 /* Function: nat_decap */
7386 /* Returns: int - -1 == error, 0 == success */
7387 /* Parameters: fin(I) - pointer to packet information */
7388 /* nat(I) - pointer to current NAT session */
7389 /* */
7390 /* This function is responsible for undoing a packet's encapsulation in the */
7391 /* reverse of an encap/divert rule. After removing the outer encapsulation */
7392 /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/
7393 /* match the "new" packet as it may still be used by IPFilter elsewhere. */
7394 /* We use "dir" here as the basis for some of the expectations about the */
7395 /* outer header. If we return an error, the goal is to leave the original */
7396 /* packet information undisturbed - this falls short at the end where we'd */
7397 /* need to back a backup copy of "fin" - expensive. */
7398 /* ------------------------------------------------------------------------ */
7399 static int
ipf_nat_decap(fin,nat)7400 ipf_nat_decap(fin, nat)
7401 fr_info_t *fin;
7402 nat_t *nat;
7403 {
7404 ipf_main_softc_t *softc = fin->fin_main_soft;
7405 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7406 char *hdr;
7407 int hlen;
7408 int skip;
7409 mb_t *m;
7410
7411 if ((fin->fin_flx & FI_ICMPERR) != 0) {
7412 /*
7413 * ICMP packets don't get decapsulated, instead what we need
7414 * to do is change the ICMP reply from including (in the data
7415 * portion for errors) the encapsulated packet that we sent
7416 * out to something that resembles the original packet prior
7417 * to encapsulation. This isn't done here - all we're doing
7418 * here is changing the outer address to ensure that it gets
7419 * targetted back to the correct system.
7420 */
7421
7422 if (nat->nat_dir & NAT_OUTBOUND) {
7423 u_32_t sum1, sum2, sumd;
7424
7425 sum1 = ntohl(fin->fin_daddr);
7426 sum2 = ntohl(nat->nat_osrcaddr);
7427 CALC_SUMD(sum1, sum2, sumd);
7428 fin->fin_ip->ip_dst = nat->nat_osrcip;
7429 fin->fin_daddr = nat->nat_osrcaddr;
7430 #if !defined(_KERNEL) || SOLARIS
7431 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0);
7432 #endif
7433 }
7434 return 0;
7435 }
7436
7437 m = fin->fin_m;
7438 skip = fin->fin_hlen;
7439
7440 switch (nat->nat_dir)
7441 {
7442 case NAT_DIVERTIN :
7443 case NAT_DIVERTOUT :
7444 if (fin->fin_plen < MINDECAP)
7445 return -1;
7446 skip += sizeof(udphdr_t);
7447 break;
7448
7449 case NAT_ENCAPIN :
7450 case NAT_ENCAPOUT :
7451 if (fin->fin_plen < (skip + sizeof(ip_t)))
7452 return -1;
7453 break;
7454 default :
7455 return -1;
7456 /* NOTREACHED */
7457 }
7458
7459 /*
7460 * The aim here is to keep the original packet details in "fin" for
7461 * as long as possible so that returning with an error is for the
7462 * original packet and there is little undoing work to do.
7463 */
7464 if (M_LEN(m) < skip + sizeof(ip_t)) {
7465 if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1)
7466 return -1;
7467 }
7468
7469 hdr = MTOD(fin->fin_m, char *);
7470 fin->fin_ip = (ip_t *)(hdr + skip);
7471 hlen = IP_HL(fin->fin_ip) << 2;
7472
7473 if (ipf_pr_pullup(fin, skip + hlen) == -1) {
7474 NBUMPSIDED(fin->fin_out, ns_decap_pullup);
7475 return -1;
7476 }
7477
7478 fin->fin_hlen = hlen;
7479 fin->fin_dlen -= skip;
7480 fin->fin_plen -= skip;
7481 fin->fin_ipoff += skip;
7482
7483 if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) {
7484 NBUMPSIDED(fin->fin_out, ns_decap_bad);
7485 return -1;
7486 }
7487
7488 return skip;
7489 }
7490
7491
7492 /* ------------------------------------------------------------------------ */
7493 /* Function: nat_nextaddr */
7494 /* Returns: int - -1 == bad input (no new address), */
7495 /* 0 == success and dst has new address */
7496 /* Parameters: fin(I) - pointer to packet information */
7497 /* na(I) - how to generate new address */
7498 /* old(I) - original address being replaced */
7499 /* dst(O) - where to put the new address */
7500 /* Write Lock: ipf_nat */
7501 /* */
7502 /* This function uses the contents of the "na" structure, in combination */
7503 /* with "old" to produce a new address to store in "dst". Not all of the */
7504 /* possible uses of "na" will result in a new address. */
7505 /* ------------------------------------------------------------------------ */
7506 static int
ipf_nat_nextaddr(fin,na,old,dst)7507 ipf_nat_nextaddr(fin, na, old, dst)
7508 fr_info_t *fin;
7509 nat_addr_t *na;
7510 u_32_t *old, *dst;
7511 {
7512 ipf_main_softc_t *softc = fin->fin_main_soft;
7513 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7514 u_32_t amin, amax, new;
7515 i6addr_t newip;
7516 int error;
7517
7518 new = 0;
7519 amin = na->na_addr[0].in4.s_addr;
7520
7521 switch (na->na_atype)
7522 {
7523 case FRI_RANGE :
7524 amax = na->na_addr[1].in4.s_addr;
7525 break;
7526
7527 case FRI_NETMASKED :
7528 case FRI_DYNAMIC :
7529 case FRI_NORMAL :
7530 /*
7531 * Compute the maximum address by adding the inverse of the
7532 * netmask to the minimum address.
7533 */
7534 amax = ~na->na_addr[1].in4.s_addr;
7535 amax |= amin;
7536 break;
7537
7538 case FRI_LOOKUP :
7539 break;
7540
7541 case FRI_BROADCAST :
7542 case FRI_PEERADDR :
7543 case FRI_NETWORK :
7544 default :
7545 DT4(ns_na_atype, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new);
7546 return -1;
7547 }
7548
7549 error = -1;
7550
7551 if (na->na_atype == FRI_LOOKUP) {
7552 if (na->na_type == IPLT_DSTLIST) {
7553 error = ipf_dstlist_select_node(fin, na->na_ptr, dst,
7554 NULL);
7555 } else {
7556 NBUMPSIDE(fin->fin_out, ns_badnextaddr);
7557 DT4(ns_badnextaddr_1, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new);
7558 }
7559
7560 } else if (na->na_atype == IPLT_NONE) {
7561 /*
7562 * 0/0 as the new address means leave it alone.
7563 */
7564 if (na->na_addr[0].in4.s_addr == 0 &&
7565 na->na_addr[1].in4.s_addr == 0) {
7566 new = *old;
7567
7568 /*
7569 * 0/32 means get the interface's address
7570 */
7571 } else if (na->na_addr[0].in4.s_addr == 0 &&
7572 na->na_addr[1].in4.s_addr == 0xffffffff) {
7573 if (ipf_ifpaddr(softc, 4, na->na_atype,
7574 fin->fin_ifp, &newip, NULL) == -1) {
7575 NBUMPSIDED(fin->fin_out, ns_ifpaddrfail);
7576 DT4(ns_ifpaddrfail, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new);
7577 return -1;
7578 }
7579 new = newip.in4.s_addr;
7580 } else {
7581 new = htonl(na->na_nextip);
7582 }
7583 *dst = new;
7584 error = 0;
7585
7586 } else {
7587 NBUMPSIDE(fin->fin_out, ns_badnextaddr);
7588 DT4(ns_badnextaddr_2, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new);
7589 }
7590
7591 return error;
7592 }
7593
7594
7595 /* ------------------------------------------------------------------------ */
7596 /* Function: nat_nextaddrinit */
7597 /* Returns: int - 0 == success, else error number */
7598 /* Parameters: softc(I) - pointer to soft context main structure */
7599 /* na(I) - NAT address information for generating new addr*/
7600 /* initial(I) - flag indicating if it is the first call for */
7601 /* this "na" structure. */
7602 /* ifp(I) - network interface to derive address */
7603 /* information from. */
7604 /* */
7605 /* This function is expected to be called in two scenarious: when a new NAT */
7606 /* rule is loaded into the kernel and when the list of NAT rules is sync'd */
7607 /* up with the valid network interfaces (possibly due to them changing.) */
7608 /* To distinguish between these, the "initial" parameter is used. If it is */
7609 /* 1 then this indicates the rule has just been reloaded and 0 for when we */
7610 /* are updating information. This difference is important because in */
7611 /* instances where we are not updating address information associated with */
7612 /* a network interface, we don't want to disturb what the "next" address to */
7613 /* come out of ipf_nat_nextaddr() will be. */
7614 /* ------------------------------------------------------------------------ */
7615 static int
ipf_nat_nextaddrinit(softc,base,na,initial,ifp)7616 ipf_nat_nextaddrinit(softc, base, na, initial, ifp)
7617 ipf_main_softc_t *softc;
7618 char *base;
7619 nat_addr_t *na;
7620 int initial;
7621 void *ifp;
7622 {
7623
7624 switch (na->na_atype)
7625 {
7626 case FRI_LOOKUP :
7627 if (na->na_subtype == 0) {
7628 na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT,
7629 na->na_type,
7630 na->na_num,
7631 &na->na_func);
7632 } else if (na->na_subtype == 1) {
7633 na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT,
7634 na->na_type,
7635 base + na->na_num,
7636 &na->na_func);
7637 }
7638 if (na->na_func == NULL) {
7639 IPFERROR(60060);
7640 return ESRCH;
7641 }
7642 if (na->na_ptr == NULL) {
7643 IPFERROR(60056);
7644 return ESRCH;
7645 }
7646 break;
7647
7648 case FRI_DYNAMIC :
7649 case FRI_BROADCAST :
7650 case FRI_NETWORK :
7651 case FRI_NETMASKED :
7652 case FRI_PEERADDR :
7653 if (ifp != NULL)
7654 (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp,
7655 &na->na_addr[0], &na->na_addr[1]);
7656 break;
7657
7658 case FRI_SPLIT :
7659 case FRI_RANGE :
7660 if (initial)
7661 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr);
7662 break;
7663
7664 case FRI_NONE :
7665 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr;
7666 return 0;
7667
7668 case FRI_NORMAL :
7669 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr;
7670 break;
7671
7672 default :
7673 IPFERROR(60054);
7674 return EINVAL;
7675 }
7676
7677 if (initial && (na->na_atype == FRI_NORMAL)) {
7678 if (na->na_addr[0].in4.s_addr == 0) {
7679 if ((na->na_addr[1].in4.s_addr == 0xffffffff) ||
7680 (na->na_addr[1].in4.s_addr == 0)) {
7681 return 0;
7682 }
7683 }
7684
7685 if (na->na_addr[1].in4.s_addr == 0xffffffff) {
7686 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr);
7687 } else {
7688 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1;
7689 }
7690 }
7691
7692 return 0;
7693 }
7694
7695
7696 /* ------------------------------------------------------------------------ */
7697 /* Function: ipf_nat_matchflush */
7698 /* Returns: int - -1 == error, 0 == success */
7699 /* Parameters: softc(I) - pointer to soft context main structure */
7700 /* softn(I) - pointer to NAT context structure */
7701 /* nat(I) - pointer to current NAT session */
7702 /* */
7703 /* ------------------------------------------------------------------------ */
7704 static int
ipf_nat_matchflush(softc,softn,data)7705 ipf_nat_matchflush(softc, softn, data)
7706 ipf_main_softc_t *softc;
7707 ipf_nat_softc_t *softn;
7708 caddr_t data;
7709 {
7710 int *array, flushed, error;
7711 nat_t *nat, *natnext;
7712 ipfobj_t obj;
7713
7714 error = ipf_matcharray_load(softc, data, &obj, &array);
7715 if (error != 0)
7716 return error;
7717
7718 flushed = 0;
7719
7720 for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) {
7721 natnext = nat->nat_next;
7722 if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) {
7723 ipf_nat_delete(softc, nat, NL_FLUSH);
7724 flushed++;
7725 }
7726 }
7727
7728 obj.ipfo_retval = flushed;
7729 error = BCOPYOUT(&obj, data, sizeof(obj));
7730
7731 KFREES(array, array[0] * sizeof(*array));
7732
7733 return error;
7734 }
7735
7736
7737 /* ------------------------------------------------------------------------ */
7738 /* Function: ipf_nat_matcharray */
7739 /* Returns: int - -1 == error, 0 == success */
7740 /* Parameters: fin(I) - pointer to packet information */
7741 /* nat(I) - pointer to current NAT session */
7742 /* */
7743 /* ------------------------------------------------------------------------ */
7744 static int
ipf_nat_matcharray(nat,array,ticks)7745 ipf_nat_matcharray(nat, array, ticks)
7746 nat_t *nat;
7747 int *array;
7748 u_long ticks;
7749 {
7750 int i, n, *x, e, p;
7751
7752 e = 0;
7753 n = array[0];
7754 x = array + 1;
7755
7756 for (; n > 0; x += 3 + x[2]) {
7757 if (x[0] == IPF_EXP_END)
7758 break;
7759 e = 0;
7760
7761 n -= x[2] + 3;
7762 if (n < 0)
7763 break;
7764
7765 p = x[0] >> 16;
7766 if (p != 0 && p != nat->nat_pr[1])
7767 break;
7768
7769 switch (x[0])
7770 {
7771 case IPF_EXP_IP_PR :
7772 for (i = 0; !e && i < x[2]; i++) {
7773 e |= (nat->nat_pr[1] == x[i + 3]);
7774 }
7775 break;
7776
7777 case IPF_EXP_IP_SRCADDR :
7778 if (nat->nat_v[0] == 4) {
7779 for (i = 0; !e && i < x[2]; i++) {
7780 e |= ((nat->nat_osrcaddr & x[i + 4]) ==
7781 x[i + 3]);
7782 }
7783 }
7784 if (nat->nat_v[1] == 4) {
7785 for (i = 0; !e && i < x[2]; i++) {
7786 e |= ((nat->nat_nsrcaddr & x[i + 4]) ==
7787 x[i + 3]);
7788 }
7789 }
7790 break;
7791
7792 case IPF_EXP_IP_DSTADDR :
7793 if (nat->nat_v[0] == 4) {
7794 for (i = 0; !e && i < x[2]; i++) {
7795 e |= ((nat->nat_odstaddr & x[i + 4]) ==
7796 x[i + 3]);
7797 }
7798 }
7799 if (nat->nat_v[1] == 4) {
7800 for (i = 0; !e && i < x[2]; i++) {
7801 e |= ((nat->nat_ndstaddr & x[i + 4]) ==
7802 x[i + 3]);
7803 }
7804 }
7805 break;
7806
7807 case IPF_EXP_IP_ADDR :
7808 for (i = 0; !e && i < x[2]; i++) {
7809 if (nat->nat_v[0] == 4) {
7810 e |= ((nat->nat_osrcaddr & x[i + 4]) ==
7811 x[i + 3]);
7812 }
7813 if (nat->nat_v[1] == 4) {
7814 e |= ((nat->nat_nsrcaddr & x[i + 4]) ==
7815 x[i + 3]);
7816 }
7817 if (nat->nat_v[0] == 4) {
7818 e |= ((nat->nat_odstaddr & x[i + 4]) ==
7819 x[i + 3]);
7820 }
7821 if (nat->nat_v[1] == 4) {
7822 e |= ((nat->nat_ndstaddr & x[i + 4]) ==
7823 x[i + 3]);
7824 }
7825 }
7826 break;
7827
7828 #ifdef USE_INET6
7829 case IPF_EXP_IP6_SRCADDR :
7830 if (nat->nat_v[0] == 6) {
7831 for (i = 0; !e && i < x[3]; i++) {
7832 e |= IP6_MASKEQ(&nat->nat_osrc6,
7833 x + i + 7, x + i + 3);
7834 }
7835 }
7836 if (nat->nat_v[1] == 6) {
7837 for (i = 0; !e && i < x[3]; i++) {
7838 e |= IP6_MASKEQ(&nat->nat_nsrc6,
7839 x + i + 7, x + i + 3);
7840 }
7841 }
7842 break;
7843
7844 case IPF_EXP_IP6_DSTADDR :
7845 if (nat->nat_v[0] == 6) {
7846 for (i = 0; !e && i < x[3]; i++) {
7847 e |= IP6_MASKEQ(&nat->nat_odst6,
7848 x + i + 7,
7849 x + i + 3);
7850 }
7851 }
7852 if (nat->nat_v[1] == 6) {
7853 for (i = 0; !e && i < x[3]; i++) {
7854 e |= IP6_MASKEQ(&nat->nat_ndst6,
7855 x + i + 7,
7856 x + i + 3);
7857 }
7858 }
7859 break;
7860
7861 case IPF_EXP_IP6_ADDR :
7862 for (i = 0; !e && i < x[3]; i++) {
7863 if (nat->nat_v[0] == 6) {
7864 e |= IP6_MASKEQ(&nat->nat_osrc6,
7865 x + i + 7,
7866 x + i + 3);
7867 }
7868 if (nat->nat_v[0] == 6) {
7869 e |= IP6_MASKEQ(&nat->nat_odst6,
7870 x + i + 7,
7871 x + i + 3);
7872 }
7873 if (nat->nat_v[1] == 6) {
7874 e |= IP6_MASKEQ(&nat->nat_nsrc6,
7875 x + i + 7,
7876 x + i + 3);
7877 }
7878 if (nat->nat_v[1] == 6) {
7879 e |= IP6_MASKEQ(&nat->nat_ndst6,
7880 x + i + 7,
7881 x + i + 3);
7882 }
7883 }
7884 break;
7885 #endif
7886
7887 case IPF_EXP_UDP_PORT :
7888 case IPF_EXP_TCP_PORT :
7889 for (i = 0; !e && i < x[2]; i++) {
7890 e |= (nat->nat_nsport == x[i + 3]) ||
7891 (nat->nat_ndport == x[i + 3]);
7892 }
7893 break;
7894
7895 case IPF_EXP_UDP_SPORT :
7896 case IPF_EXP_TCP_SPORT :
7897 for (i = 0; !e && i < x[2]; i++) {
7898 e |= (nat->nat_nsport == x[i + 3]);
7899 }
7900 break;
7901
7902 case IPF_EXP_UDP_DPORT :
7903 case IPF_EXP_TCP_DPORT :
7904 for (i = 0; !e && i < x[2]; i++) {
7905 e |= (nat->nat_ndport == x[i + 3]);
7906 }
7907 break;
7908
7909 case IPF_EXP_TCP_STATE :
7910 for (i = 0; !e && i < x[2]; i++) {
7911 e |= (nat->nat_tcpstate[0] == x[i + 3]) ||
7912 (nat->nat_tcpstate[1] == x[i + 3]);
7913 }
7914 break;
7915
7916 case IPF_EXP_IDLE_GT :
7917 e |= (ticks - nat->nat_touched > x[3]);
7918 break;
7919 }
7920 e ^= x[1];
7921
7922 if (!e)
7923 break;
7924 }
7925
7926 return e;
7927 }
7928
7929
7930 /* ------------------------------------------------------------------------ */
7931 /* Function: ipf_nat_gettable */
7932 /* Returns: int - 0 = success, else error */
7933 /* Parameters: softc(I) - pointer to soft context main structure */
7934 /* softn(I) - pointer to NAT context structure */
7935 /* data(I) - pointer to ioctl data */
7936 /* */
7937 /* This function handles ioctl requests for tables of nat information. */
7938 /* At present the only table it deals with is the hash bucket statistics. */
7939 /* ------------------------------------------------------------------------ */
7940 static int
ipf_nat_gettable(softc,softn,data)7941 ipf_nat_gettable(softc, softn, data)
7942 ipf_main_softc_t *softc;
7943 ipf_nat_softc_t *softn;
7944 char *data;
7945 {
7946 ipftable_t table;
7947 int error;
7948
7949 error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE);
7950 if (error != 0)
7951 return error;
7952
7953 switch (table.ita_type)
7954 {
7955 case IPFTABLE_BUCKETS_NATIN :
7956 error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
7957 table.ita_table,
7958 softn->ipf_nat_table_sz * sizeof(u_int));
7959 break;
7960
7961 case IPFTABLE_BUCKETS_NATOUT :
7962 error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
7963 table.ita_table,
7964 softn->ipf_nat_table_sz * sizeof(u_int));
7965 break;
7966
7967 default :
7968 IPFERROR(60058);
7969 return EINVAL;
7970 }
7971
7972 if (error != 0) {
7973 IPFERROR(60059);
7974 error = EFAULT;
7975 }
7976 return error;
7977 }
7978
7979
7980 /* ------------------------------------------------------------------------ */
7981 /* Function: ipf_nat_settimeout */
7982 /* Returns: int - 0 = success, else failure */
7983 /* Parameters: softc(I) - pointer to soft context main structure */
7984 /* t(I) - pointer to tunable */
7985 /* p(I) - pointer to new tuning data */
7986 /* */
7987 /* Apply the timeout change to the NAT timeout queues. */
7988 /* ------------------------------------------------------------------------ */
7989 int
ipf_nat_settimeout(softc,t,p)7990 ipf_nat_settimeout(softc, t, p)
7991 struct ipf_main_softc_s *softc;
7992 ipftuneable_t *t;
7993 ipftuneval_t *p;
7994 {
7995 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
7996
7997 if (!strncmp(t->ipft_name, "tcp_", 4))
7998 return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq);
7999
8000 if (!strcmp(t->ipft_name, "udp_timeout")) {
8001 ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int);
8002 } else if (!strcmp(t->ipft_name, "udp_ack_timeout")) {
8003 ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int);
8004 } else if (!strcmp(t->ipft_name, "icmp_timeout")) {
8005 ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int);
8006 } else if (!strcmp(t->ipft_name, "icmp_ack_timeout")) {
8007 ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int);
8008 } else if (!strcmp(t->ipft_name, "ip_timeout")) {
8009 ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int);
8010 } else {
8011 IPFERROR(60062);
8012 return ESRCH;
8013 }
8014 return 0;
8015 }
8016
8017
8018 /* ------------------------------------------------------------------------ */
8019 /* Function: ipf_nat_rehash */
8020 /* Returns: int - 0 = success, else failure */
8021 /* Parameters: softc(I) - pointer to soft context main structure */
8022 /* t(I) - pointer to tunable */
8023 /* p(I) - pointer to new tuning data */
8024 /* */
8025 /* To change the size of the basic NAT table, we need to first allocate the */
8026 /* new tables (lest it fails and we've got nowhere to store all of the NAT */
8027 /* sessions currently active) and then walk through the entire list and */
8028 /* insert them into the table. There are two tables here: an inbound one */
8029 /* and an outbound one. Each NAT entry goes into each table once. */
8030 /* ------------------------------------------------------------------------ */
8031 int
ipf_nat_rehash(softc,t,p)8032 ipf_nat_rehash(softc, t, p)
8033 ipf_main_softc_t *softc;
8034 ipftuneable_t *t;
8035 ipftuneval_t *p;
8036 {
8037 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8038 nat_t **newtab[2], *nat, **natp;
8039 u_int *bucketlens[2];
8040 u_int maxbucket;
8041 u_int newsize;
8042 int error;
8043 u_int hv;
8044 int i;
8045
8046 newsize = p->ipftu_int;
8047 /*
8048 * In case there is nothing to do...
8049 */
8050 if (newsize == softn->ipf_nat_table_sz)
8051 return 0;
8052
8053 newtab[0] = NULL;
8054 newtab[1] = NULL;
8055 bucketlens[0] = NULL;
8056 bucketlens[1] = NULL;
8057 /*
8058 * 4 tables depend on the NAT table size: the inbound looking table,
8059 * the outbound lookup table and the hash chain length for each.
8060 */
8061 KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *));
8062 if (newtab[0] == NULL) {
8063 error = 60063;
8064 goto badrehash;
8065 }
8066
8067 KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *));
8068 if (newtab[1] == NULL) {
8069 error = 60064;
8070 goto badrehash;
8071 }
8072
8073 KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int));
8074 if (bucketlens[0] == NULL) {
8075 error = 60065;
8076 goto badrehash;
8077 }
8078
8079 KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int));
8080 if (bucketlens[1] == NULL) {
8081 error = 60066;
8082 goto badrehash;
8083 }
8084
8085 /*
8086 * Recalculate the maximum length based on the new size.
8087 */
8088 for (maxbucket = 0, i = newsize; i > 0; i >>= 1)
8089 maxbucket++;
8090 maxbucket *= 2;
8091
8092 bzero((char *)newtab[0], newsize * sizeof(nat_t *));
8093 bzero((char *)newtab[1], newsize * sizeof(nat_t *));
8094 bzero((char *)bucketlens[0], newsize * sizeof(u_int));
8095 bzero((char *)bucketlens[1], newsize * sizeof(u_int));
8096
8097 WRITE_ENTER(&softc->ipf_nat);
8098
8099 if (softn->ipf_nat_table[0] != NULL) {
8100 KFREES(softn->ipf_nat_table[0],
8101 softn->ipf_nat_table_sz *
8102 sizeof(*softn->ipf_nat_table[0]));
8103 }
8104 softn->ipf_nat_table[0] = newtab[0];
8105
8106 if (softn->ipf_nat_table[1] != NULL) {
8107 KFREES(softn->ipf_nat_table[1],
8108 softn->ipf_nat_table_sz *
8109 sizeof(*softn->ipf_nat_table[1]));
8110 }
8111 softn->ipf_nat_table[1] = newtab[1];
8112
8113 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) {
8114 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen,
8115 softn->ipf_nat_table_sz * sizeof(u_int));
8116 }
8117 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0];
8118
8119 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) {
8120 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen,
8121 softn->ipf_nat_table_sz * sizeof(u_int));
8122 }
8123 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1];
8124
8125 #ifdef USE_INET6
8126 if (softn->ipf_nat_stats.ns_side6[0].ns_bucketlen != NULL) {
8127 KFREES(softn->ipf_nat_stats.ns_side6[0].ns_bucketlen,
8128 softn->ipf_nat_table_sz * sizeof(u_int));
8129 }
8130 softn->ipf_nat_stats.ns_side6[0].ns_bucketlen = bucketlens[0];
8131
8132 if (softn->ipf_nat_stats.ns_side6[1].ns_bucketlen != NULL) {
8133 KFREES(softn->ipf_nat_stats.ns_side6[1].ns_bucketlen,
8134 softn->ipf_nat_table_sz * sizeof(u_int));
8135 }
8136 softn->ipf_nat_stats.ns_side6[1].ns_bucketlen = bucketlens[1];
8137 #endif
8138
8139 softn->ipf_nat_maxbucket = maxbucket;
8140 softn->ipf_nat_table_sz = newsize;
8141 /*
8142 * Walk through the entire list of NAT table entries and put them
8143 * in the new NAT table, somewhere. Because we have a new table,
8144 * we need to restart the counter of how many chains are in use.
8145 */
8146 softn->ipf_nat_stats.ns_side[0].ns_inuse = 0;
8147 softn->ipf_nat_stats.ns_side[1].ns_inuse = 0;
8148 #ifdef USE_INET6
8149 softn->ipf_nat_stats.ns_side6[0].ns_inuse = 0;
8150 softn->ipf_nat_stats.ns_side6[1].ns_inuse = 0;
8151 #endif
8152
8153 for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) {
8154 nat->nat_hnext[0] = NULL;
8155 nat->nat_phnext[0] = NULL;
8156 hv = nat->nat_hv[0] % softn->ipf_nat_table_sz;
8157
8158 natp = &softn->ipf_nat_table[0][hv];
8159 if (*natp) {
8160 (*natp)->nat_phnext[0] = &nat->nat_hnext[0];
8161 } else {
8162 NBUMPSIDE(0, ns_inuse);
8163 }
8164 nat->nat_phnext[0] = natp;
8165 nat->nat_hnext[0] = *natp;
8166 *natp = nat;
8167 NBUMPSIDE(0, ns_bucketlen[hv]);
8168
8169 nat->nat_hnext[1] = NULL;
8170 nat->nat_phnext[1] = NULL;
8171 hv = nat->nat_hv[1] % softn->ipf_nat_table_sz;
8172
8173 natp = &softn->ipf_nat_table[1][hv];
8174 if (*natp) {
8175 (*natp)->nat_phnext[1] = &nat->nat_hnext[1];
8176 } else {
8177 NBUMPSIDE(1, ns_inuse);
8178 }
8179 nat->nat_phnext[1] = natp;
8180 nat->nat_hnext[1] = *natp;
8181 *natp = nat;
8182 NBUMPSIDE(1, ns_bucketlen[hv]);
8183 }
8184 RWLOCK_EXIT(&softc->ipf_nat);
8185
8186 return 0;
8187
8188 badrehash:
8189 if (bucketlens[1] != NULL) {
8190 KFREES(bucketlens[0], newsize * sizeof(u_int));
8191 }
8192 if (bucketlens[0] != NULL) {
8193 KFREES(bucketlens[0], newsize * sizeof(u_int));
8194 }
8195 if (newtab[0] != NULL) {
8196 KFREES(newtab[0], newsize * sizeof(nat_t *));
8197 }
8198 if (newtab[1] != NULL) {
8199 KFREES(newtab[1], newsize * sizeof(nat_t *));
8200 }
8201 IPFERROR(error);
8202 return ENOMEM;
8203 }
8204
8205
8206 /* ------------------------------------------------------------------------ */
8207 /* Function: ipf_nat_rehash_rules */
8208 /* Returns: int - 0 = success, else failure */
8209 /* Parameters: softc(I) - pointer to soft context main structure */
8210 /* t(I) - pointer to tunable */
8211 /* p(I) - pointer to new tuning data */
8212 /* */
8213 /* All of the NAT rules hang off of a hash table that is searched with a */
8214 /* hash on address after the netmask is applied. There is a different table*/
8215 /* for both inbound rules (rdr) and outbound (map.) The resizing will only */
8216 /* affect one of these two tables. */
8217 /* ------------------------------------------------------------------------ */
8218 int
ipf_nat_rehash_rules(softc,t,p)8219 ipf_nat_rehash_rules(softc, t, p)
8220 ipf_main_softc_t *softc;
8221 ipftuneable_t *t;
8222 ipftuneval_t *p;
8223 {
8224 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8225 ipnat_t **newtab, *np, ***old, **npp;
8226 u_int newsize;
8227 u_int mask;
8228 u_int hv;
8229
8230 newsize = p->ipftu_int;
8231 /*
8232 * In case there is nothing to do...
8233 */
8234 if (newsize == *t->ipft_pint)
8235 return 0;
8236
8237 /*
8238 * All inbound rules have the NAT_REDIRECT bit set in in_redir and
8239 * all outbound rules have either NAT_MAP or MAT_MAPBLK set.
8240 * This if statement allows for some more generic code to be below,
8241 * rather than two huge gobs of code that almost do the same thing.
8242 */
8243 if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) {
8244 old = &softn->ipf_nat_rdr_rules;
8245 mask = NAT_REDIRECT;
8246 } else {
8247 old = &softn->ipf_nat_map_rules;
8248 mask = NAT_MAP|NAT_MAPBLK;
8249 }
8250
8251 KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *));
8252 if (newtab == NULL) {
8253 IPFERROR(60067);
8254 return ENOMEM;
8255 }
8256
8257 bzero((char *)newtab, newsize * sizeof(ipnat_t *));
8258
8259 WRITE_ENTER(&softc->ipf_nat);
8260
8261 if (*old != NULL) {
8262 KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **));
8263 }
8264 *old = newtab;
8265 *t->ipft_pint = newsize;
8266
8267 for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) {
8268 if ((np->in_redir & mask) == 0)
8269 continue;
8270
8271 if (np->in_redir & NAT_REDIRECT) {
8272 np->in_rnext = NULL;
8273 hv = np->in_hv[0] % newsize;
8274 for (npp = newtab + hv; *npp != NULL; )
8275 npp = &(*npp)->in_rnext;
8276 np->in_prnext = npp;
8277 *npp = np;
8278 }
8279 if (np->in_redir & NAT_MAP) {
8280 np->in_mnext = NULL;
8281 hv = np->in_hv[1] % newsize;
8282 for (npp = newtab + hv; *npp != NULL; )
8283 npp = &(*npp)->in_mnext;
8284 np->in_pmnext = npp;
8285 *npp = np;
8286 }
8287
8288 }
8289 RWLOCK_EXIT(&softc->ipf_nat);
8290
8291 return 0;
8292 }
8293
8294
8295 /* ------------------------------------------------------------------------ */
8296 /* Function: ipf_nat_hostmap_rehash */
8297 /* Returns: int - 0 = success, else failure */
8298 /* Parameters: softc(I) - pointer to soft context main structure */
8299 /* t(I) - pointer to tunable */
8300 /* p(I) - pointer to new tuning data */
8301 /* */
8302 /* Allocate and populate a new hash table that will contain a reference to */
8303 /* all of the active IP# translations currently in place. */
8304 /* ------------------------------------------------------------------------ */
8305 int
ipf_nat_hostmap_rehash(softc,t,p)8306 ipf_nat_hostmap_rehash(softc, t, p)
8307 ipf_main_softc_t *softc;
8308 ipftuneable_t *t;
8309 ipftuneval_t *p;
8310 {
8311 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8312 hostmap_t *hm, **newtab;
8313 u_int newsize;
8314 u_int hv;
8315
8316 newsize = p->ipftu_int;
8317 /*
8318 * In case there is nothing to do...
8319 */
8320 if (newsize == *t->ipft_pint)
8321 return 0;
8322
8323 KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *));
8324 if (newtab == NULL) {
8325 IPFERROR(60068);
8326 return ENOMEM;
8327 }
8328
8329 bzero((char *)newtab, newsize * sizeof(hostmap_t *));
8330
8331 WRITE_ENTER(&softc->ipf_nat);
8332 if (softn->ipf_hm_maptable != NULL) {
8333 KFREES(softn->ipf_hm_maptable,
8334 softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *));
8335 }
8336 softn->ipf_hm_maptable = newtab;
8337 softn->ipf_nat_hostmap_sz = newsize;
8338
8339 for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) {
8340 hv = hm->hm_hv % softn->ipf_nat_hostmap_sz;
8341 hm->hm_hnext = softn->ipf_hm_maptable[hv];
8342 hm->hm_phnext = softn->ipf_hm_maptable + hv;
8343 if (softn->ipf_hm_maptable[hv] != NULL)
8344 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext;
8345 softn->ipf_hm_maptable[hv] = hm;
8346 }
8347 RWLOCK_EXIT(&softc->ipf_nat);
8348
8349 return 0;
8350 }
8351
8352
8353 /* ------------------------------------------------------------------------ */
8354 /* Function: ipf_nat_add_tq */
8355 /* Parameters: softc(I) - pointer to soft context main structure */
8356 /* */
8357 /* ------------------------------------------------------------------------ */
8358 ipftq_t *
ipf_nat_add_tq(softc,ttl)8359 ipf_nat_add_tq(softc, ttl)
8360 ipf_main_softc_t *softc;
8361 int ttl;
8362 {
8363 ipf_nat_softc_t *softs = softc->ipf_nat_soft;
8364
8365 return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl);
8366 }
8367
8368 /* ------------------------------------------------------------------------ */
8369 /* Function: ipf_nat_uncreate */
8370 /* Returns: Nil */
8371 /* Parameters: fin(I) - pointer to packet information */
8372 /* */
8373 /* This function is used to remove a NAT entry from the NAT table when we */
8374 /* decide that the create was actually in error. It is thus assumed that */
8375 /* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */
8376 /* with the translated packet (not the original), we have to reverse the */
8377 /* lookup. Although doing the lookup is expensive (relatively speaking), it */
8378 /* is not anticipated that this will be a frequent occurance for normal */
8379 /* traffic patterns. */
8380 /* ------------------------------------------------------------------------ */
8381 void
ipf_nat_uncreate(fin)8382 ipf_nat_uncreate(fin)
8383 fr_info_t *fin;
8384 {
8385 ipf_main_softc_t *softc = fin->fin_main_soft;
8386 ipf_nat_softc_t *softn = softc->ipf_nat_soft;
8387 int nflags;
8388 nat_t *nat;
8389
8390 switch (fin->fin_p)
8391 {
8392 case IPPROTO_TCP :
8393 nflags = IPN_TCP;
8394 break;
8395 case IPPROTO_UDP :
8396 nflags = IPN_UDP;
8397 break;
8398 default :
8399 nflags = 0;
8400 break;
8401 }
8402
8403 WRITE_ENTER(&softc->ipf_nat);
8404
8405 if (fin->fin_out == 0) {
8406 nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p,
8407 fin->fin_dst, fin->fin_src);
8408 } else {
8409 nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p,
8410 fin->fin_src, fin->fin_dst);
8411 }
8412
8413 if (nat != NULL) {
8414 NBUMPSIDE(fin->fin_out, ns_uncreate[0]);
8415 ipf_nat_delete(softc, nat, NL_DESTROY);
8416 } else {
8417 NBUMPSIDE(fin->fin_out, ns_uncreate[1]);
8418 }
8419
8420 RWLOCK_EXIT(&softc->ipf_nat);
8421 }
8422
8423
8424 /* ------------------------------------------------------------------------ */
8425 /* Function: ipf_nat_cmp_rules */
8426 /* Returns: int - 0 == success, else rules do not match. */
8427 /* Parameters: n1(I) - first rule to compare */
8428 /* n2(I) - first rule to compare */
8429 /* */
8430 /* Compare two rules using pointers to each rule. A straight bcmp will not */
8431 /* work as some fields (such as in_dst, in_pkts) actually do change once */
8432 /* the rule has been loaded into the kernel. Whilst this function returns */
8433 /* various non-zero returns, they're strictly to aid in debugging. Use of */
8434 /* this function should simply care if the result is zero or not. */
8435 /* ------------------------------------------------------------------------ */
8436 static int
ipf_nat_cmp_rules(n1,n2)8437 ipf_nat_cmp_rules(n1, n2)
8438 ipnat_t *n1, *n2;
8439 {
8440 if (n1->in_size != n2->in_size)
8441 return 1;
8442
8443 if (bcmp((char *)&n1->in_v, (char *)&n2->in_v,
8444 offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0)
8445 return 2;
8446
8447 if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc,
8448 n1->in_size - offsetof(ipnat_t, in_tuc)) != 0)
8449 return 3;
8450 if (n1->in_ndst.na_atype != n2->in_ndst.na_atype)
8451 return 5;
8452 if (n1->in_ndst.na_function != n2->in_ndst.na_function)
8453 return 6;
8454 if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr,
8455 sizeof(n1->in_ndst.na_addr)))
8456 return 7;
8457 if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype)
8458 return 8;
8459 if (n1->in_nsrc.na_function != n2->in_nsrc.na_function)
8460 return 9;
8461 if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr,
8462 sizeof(n1->in_nsrc.na_addr)))
8463 return 10;
8464 if (n1->in_odst.na_atype != n2->in_odst.na_atype)
8465 return 11;
8466 if (n1->in_odst.na_function != n2->in_odst.na_function)
8467 return 12;
8468 if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr,
8469 sizeof(n1->in_odst.na_addr)))
8470 return 13;
8471 if (n1->in_osrc.na_atype != n2->in_osrc.na_atype)
8472 return 14;
8473 if (n1->in_osrc.na_function != n2->in_osrc.na_function)
8474 return 15;
8475 if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr,
8476 sizeof(n1->in_osrc.na_addr)))
8477 return 16;
8478 return 0;
8479 }
8480
8481
8482 /* ------------------------------------------------------------------------ */
8483 /* Function: ipf_nat_rule_init */
8484 /* Returns: int - 0 == success, else rules do not match. */
8485 /* Parameters: softc(I) - pointer to soft context main structure */
8486 /* softn(I) - pointer to NAT context structure */
8487 /* n(I) - first rule to compare */
8488 /* */
8489 /* ------------------------------------------------------------------------ */
8490 static int
ipf_nat_rule_init(softc,softn,n)8491 ipf_nat_rule_init(softc, softn, n)
8492 ipf_main_softc_t *softc;
8493 ipf_nat_softc_t *softn;
8494 ipnat_t *n;
8495 {
8496 int error = 0;
8497
8498 if ((n->in_flags & IPN_SIPRANGE) != 0)
8499 n->in_nsrcatype = FRI_RANGE;
8500
8501 if ((n->in_flags & IPN_DIPRANGE) != 0)
8502 n->in_ndstatype = FRI_RANGE;
8503
8504 if ((n->in_flags & IPN_SPLIT) != 0)
8505 n->in_ndstatype = FRI_SPLIT;
8506
8507 if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0)
8508 n->in_spnext = n->in_spmin;
8509
8510 if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) {
8511 n->in_dpnext = n->in_dpmin;
8512 } else if (n->in_redir == NAT_REDIRECT) {
8513 n->in_dpnext = n->in_dpmin;
8514 }
8515
8516 n->in_stepnext = 0;
8517
8518 switch (n->in_v[0])
8519 {
8520 case 4 :
8521 error = ipf_nat_ruleaddrinit(softc, softn, n);
8522 if (error != 0)
8523 return error;
8524 break;
8525 #ifdef USE_INET6
8526 case 6 :
8527 error = ipf_nat6_ruleaddrinit(softc, softn, n);
8528 if (error != 0)
8529 return error;
8530 break;
8531 #endif
8532 default :
8533 break;
8534 }
8535
8536 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) {
8537 /*
8538 * Prerecord whether or not the destination of the divert
8539 * is local or not to the interface the packet is going
8540 * to be sent out.
8541 */
8542 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1],
8543 n->in_ifps[1], &n->in_ndstip6);
8544 }
8545
8546 return error;
8547 }
8548
8549
8550 /* ------------------------------------------------------------------------ */
8551 /* Function: ipf_nat_rule_fini */
8552 /* Returns: int - 0 == success, else rules do not match. */
8553 /* Parameters: softc(I) - pointer to soft context main structure */
8554 /* n(I) - rule to work on */
8555 /* */
8556 /* This function is used to release any objects that were referenced during */
8557 /* the rule initialisation. This is useful both when free'ing the rule and */
8558 /* when handling ioctls that need to initialise these fields but not */
8559 /* actually use them after the ioctl processing has finished. */
8560 /* ------------------------------------------------------------------------ */
8561 static void
ipf_nat_rule_fini(softc,n)8562 ipf_nat_rule_fini(softc, n)
8563 ipf_main_softc_t *softc;
8564 ipnat_t *n;
8565 {
8566 if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL)
8567 ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr);
8568
8569 if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL)
8570 ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr);
8571
8572 if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL)
8573 ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr);
8574
8575 if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL)
8576 ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr);
8577
8578 if (n->in_divmp != NULL)
8579 FREE_MB_T(n->in_divmp);
8580 }
8581