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(AIX)
20 # include <sys/fcntl.h>
21 #endif
22 #if !defined(_KERNEL) && !defined(__KERNEL__)
23 # include <stdio.h>
24 # include <string.h>
25 # include <stdlib.h>
26 # include <ctype.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(linux)
35 # include <sys/protosw.h>
36 #endif
37 #include <sys/socket.h>
38 #if defined(_KERNEL)
39 # if !defined(__NetBSD__) && !defined(sun) && !defined(__osf__) && \
40 !defined(__OpenBSD__) && !defined(__hpux) && !defined(__sgi) && \
41 !defined(AIX)
42 # include <sys/ctype.h>
43 # endif
44 # include <sys/systm.h>
45 # if !defined(__SVR4) && !defined(__svr4__)
46 # include <sys/mbuf.h>
47 # endif
48 #endif
49 #if defined(_KERNEL) && (__FreeBSD_version >= 220000)
50 # include <sys/filio.h>
51 # include <sys/fcntl.h>
52 #else
53 # include <sys/ioctl.h>
54 #endif
55 #if defined(__SVR4) || defined(__svr4__)
56 # include <sys/byteorder.h>
57 # ifdef _KERNEL
58 # include <sys/dditypes.h>
59 # endif
60 # include <sys/stream.h>
61 # include <sys/kmem.h>
62 #endif
63 #if __FreeBSD_version >= 300000
64 # include <sys/queue.h>
65 #endif
66 #include <net/if.h>
67 #ifdef sun
68 # include <net/af.h>
69 #endif
70 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #ifndef linux
74 # include <netinet/ip_var.h>
75 #endif
76 #include <netinet/tcp.h>
77 #include <netinet/udp.h>
78 #include <netinet/ip_icmp.h>
79 #include "netinet/ip_compat.h"
80 #include <netinet/tcpip.h>
81 #include "netinet/ip_fil.h"
82 #include "netinet/ip_nat.h"
83 #include "netinet/ip_state.h"
84 #include "netinet/ip_proxy.h"
85 #if (__FreeBSD_version >= 300000)
86 # include <sys/malloc.h>
87 #endif
88
89 /* END OF INCLUDES */
90
91 #include "netinet/ip_ftp_pxy.c"
92 #include "netinet/ip_tftp_pxy.c"
93 #include "netinet/ip_rcmd_pxy.c"
94 #include "netinet/ip_pptp_pxy.c"
95 #if defined(_KERNEL)
96 # include "netinet/ip_irc_pxy.c"
97 # include "netinet/ip_raudio_pxy.c"
98 # include "netinet/ip_netbios_pxy.c"
99 #endif
100 #include "netinet/ip_ipsec_pxy.c"
101 #include "netinet/ip_rpcb_pxy.c"
102
103 #if !defined(lint)
104 static const char rcsid[] = "@(#)$Id$";
105 #endif
106
107 #define AP_SESS_SIZE 53
108
109 static int ipf_proxy_fixseqack __P((fr_info_t *, ip_t *, ap_session_t *, int ));
110 static aproxy_t *ipf_proxy_create_clone __P((ipf_main_softc_t *, aproxy_t *));
111
112 typedef struct ipf_proxy_softc_s {
113 int ips_proxy_debug;
114 int ips_proxy_session_size;
115 ap_session_t **ips_sess_tab;
116 ap_session_t *ips_sess_list;
117 aproxy_t *ips_proxies;
118 int ips_init_run;
119 ipftuneable_t *ipf_proxy_tune;
120 } ipf_proxy_softc_t;
121
122 static ipftuneable_t ipf_proxy_tuneables[] = {
123 { { (void *)offsetof(ipf_proxy_softc_t, ips_proxy_debug) },
124 "proxy_debug", 0, 0x1f,
125 stsizeof(ipf_proxy_softc_t, ips_proxy_debug),
126 0, NULL, NULL },
127 { { NULL }, NULL, 0, 0,
128 0,
129 0, NULL, NULL}
130 };
131
132 static aproxy_t *ap_proxylist = NULL;
133 static aproxy_t ips_proxies[] = {
134 #ifdef IPF_FTP_PROXY
135 { NULL, NULL, "ftp", (char)IPPROTO_TCP, 0, 0, 0,
136 ipf_p_ftp_main_load, ipf_p_ftp_main_unload,
137 ipf_p_ftp_soft_create, ipf_p_ftp_soft_destroy,
138 NULL, NULL,
139 ipf_p_ftp_new, ipf_p_ftp_del, ipf_p_ftp_in, ipf_p_ftp_out, NULL,
140 NULL, NULL, NULL, NULL },
141 #endif
142 #ifdef IPF_TFTP_PROXY
143 { NULL, NULL, "tftp", (char)IPPROTO_UDP, 0, 0, 0,
144 ipf_p_tftp_main_load, ipf_p_tftp_main_unload,
145 ipf_p_tftp_soft_create, ipf_p_tftp_soft_destroy,
146 NULL, NULL,
147 ipf_p_tftp_new, ipf_p_tftp_del,
148 ipf_p_tftp_in, ipf_p_tftp_out, NULL,
149 NULL, NULL, NULL, NULL },
150 #endif
151 #ifdef IPF_IRC_PROXY
152 { NULL, NULL, "irc", (char)IPPROTO_TCP, 0, 0, 0,
153 ipf_p_irc_main_load, ipf_p_irc_main_unload,
154 NULL, NULL,
155 NULL, NULL,
156 ipf_p_irc_new, NULL, NULL, ipf_p_irc_out, NULL,
157 NULL, NULL, NULL, NULL },
158 #endif
159 #ifdef IPF_RCMD_PROXY
160 { NULL, NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, 0,
161 ipf_p_rcmd_main_load, ipf_p_rcmd_main_unload,
162 NULL, NULL,
163 NULL, NULL,
164 ipf_p_rcmd_new, ipf_p_rcmd_del,
165 ipf_p_rcmd_in, ipf_p_rcmd_out, NULL,
166 NULL, NULL, NULL, NULL },
167 #endif
168 #ifdef IPF_RAUDIO_PROXY
169 { NULL, NULL, "raudio", (char)IPPROTO_TCP, 0, 0, 0,
170 ipf_p_raudio_main_load, ipf_p_raudio_main_unload,
171 NULL, NULL,
172 NULL, NULL,
173 ipf_p_raudio_new, NULL, ipf_p_raudio_in, ipf_p_raudio_out, NULL,
174 NULL, NULL, NULL, NULL },
175 #endif
176 #ifdef IPF_MSNRPC_PROXY
177 { NULL, NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, 0,
178 ipf_p_msnrpc_init, ipf_p_msnrpc_fini,
179 NULL, NULL,
180 NULL, NULL,
181 ipf_p_msnrpc_new, NULL, ipf_p_msnrpc_in, ipf_p_msnrpc_out, NULL,
182 NULL, NULL, NULL, NULL },
183 #endif
184 #ifdef IPF_NETBIOS_PROXY
185 { NULL, NULL, "netbios", (char)IPPROTO_UDP, 0, 0, 0,
186 ipf_p_netbios_main_load, ipf_p_netbios_main_unload,
187 NULL, NULL,
188 NULL, NULL,
189 NULL, NULL, NULL, ipf_p_netbios_out, NULL,
190 NULL, NULL, NULL, NULL },
191 #endif
192 #ifdef IPF_IPSEC_PROXY
193 { NULL, NULL, "ipsec", (char)IPPROTO_UDP, 0, 0, 0,
194 NULL, NULL,
195 ipf_p_ipsec_soft_create, ipf_p_ipsec_soft_destroy,
196 ipf_p_ipsec_soft_init, ipf_p_ipsec_soft_fini,
197 ipf_p_ipsec_new, ipf_p_ipsec_del,
198 ipf_p_ipsec_inout, ipf_p_ipsec_inout, ipf_p_ipsec_match,
199 NULL, NULL, NULL, NULL },
200 #endif
201 #ifdef IPF_DNS_PROXY
202 { NULL, NULL, "dns", (char)IPPROTO_UDP, 0, 0, 0,
203 NULL, NULL,
204 ipf_p_dns_soft_create, ipf_p_dns_soft_destroy,
205 NULL, NULL,
206 ipf_p_dns_new, ipf_p_ipsec_del,
207 ipf_p_dns_inout, ipf_p_dns_inout, ipf_p_dns_match,
208 ipf_p_dns_ctl, NULL, NULL, NULL },
209 #endif
210 #ifdef IPF_PPTP_PROXY
211 { NULL, NULL, "pptp", (char)IPPROTO_TCP, 0, 0, 0,
212 ipf_p_pptp_main_load, ipf_p_pptp_main_unload,
213 NULL, NULL,
214 NULL, NULL,
215 ipf_p_pptp_new, ipf_p_pptp_del,
216 ipf_p_pptp_inout, ipf_p_pptp_inout, NULL,
217 NULL, NULL, NULL, NULL },
218 #endif
219 #ifdef IPF_RPCB_PROXY
220 # ifndef _KERNEL
221 { NULL, NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0, 0,
222 NULL, NULL,
223 NULL, NULL,
224 NULL, NULL,
225 ipf_p_rpcb_new, ipf_p_rpcb_del,
226 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
227 NULL, NULL, NULL, NULL },
228 # endif
229 { NULL, NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0, 0,
230 ipf_p_rpcb_main_load, ipf_p_rpcb_main_unload,
231 NULL, NULL,
232 NULL, NULL,
233 ipf_p_rpcb_new, ipf_p_rpcb_del,
234 ipf_p_rpcb_in, ipf_p_rpcb_out, NULL,
235 NULL, NULL, NULL, NULL },
236 #endif
237 { NULL, NULL, "", '\0', 0, 0, 0,
238 NULL, NULL,
239 NULL, NULL,
240 NULL, NULL,
241 NULL, NULL,
242 NULL, NULL, NULL,
243 NULL, NULL, NULL, NULL }
244 };
245
246
247 /* ------------------------------------------------------------------------ */
248 /* Function: ipf_proxy_main_load */
249 /* Returns: int - 0 == success, else failure. */
250 /* Parameters: Nil */
251 /* */
252 /* Initialise hook for kernel application proxies. */
253 /* Call the initialise routine for all the compiled in kernel proxies. */
254 /* ------------------------------------------------------------------------ */
255 int
ipf_proxy_main_load()256 ipf_proxy_main_load()
257 {
258 aproxy_t *ap;
259
260 for (ap = ips_proxies; ap->apr_p; ap++) {
261 if (ap->apr_load != NULL)
262 (*ap->apr_load)();
263 }
264 return 0;
265 }
266
267
268 /* ------------------------------------------------------------------------ */
269 /* Function: ipf_proxy_main_unload */
270 /* Returns: int - 0 == success, else failure. */
271 /* Parameters: Nil */
272 /* */
273 /* Unload hook for kernel application proxies. */
274 /* Call the finialise routine for all the compiled in kernel proxies. */
275 /* ------------------------------------------------------------------------ */
276 int
ipf_proxy_main_unload()277 ipf_proxy_main_unload()
278 {
279 aproxy_t *ap;
280
281 for (ap = ips_proxies; ap->apr_p; ap++)
282 if (ap->apr_unload != NULL)
283 (*ap->apr_unload)();
284 for (ap = ap_proxylist; ap; ap = ap->apr_next)
285 if (ap->apr_unload != NULL)
286 (*ap->apr_unload)();
287
288 return 0;
289 }
290
291
292 /* ------------------------------------------------------------------------ */
293 /* Function: ipf_proxy_soft_create */
294 /* Returns: void * - */
295 /* Parameters: softc(I) - pointer to soft context main structure */
296 /* */
297 /* Build the structure to hold all of the run time data to support proxies. */
298 /* ------------------------------------------------------------------------ */
299 void *
ipf_proxy_soft_create(softc)300 ipf_proxy_soft_create(softc)
301 ipf_main_softc_t *softc;
302 {
303 ipf_proxy_softc_t *softp;
304 aproxy_t *last;
305 aproxy_t *apn;
306 aproxy_t *ap;
307
308 KMALLOC(softp, ipf_proxy_softc_t *);
309 if (softp == NULL)
310 return softp;
311
312 bzero((char *)softp, sizeof(*softp));
313
314 #if defined(_KERNEL)
315 softp->ips_proxy_debug = 0;
316 #else
317 softp->ips_proxy_debug = 2;
318 #endif
319 softp->ips_proxy_session_size = AP_SESS_SIZE;
320
321 softp->ipf_proxy_tune = ipf_tune_array_copy(softp,
322 sizeof(ipf_proxy_tuneables),
323 ipf_proxy_tuneables);
324 if (softp->ipf_proxy_tune == NULL) {
325 ipf_proxy_soft_destroy(softc, softp);
326 return NULL;
327 }
328 if (ipf_tune_array_link(softc, softp->ipf_proxy_tune) == -1) {
329 ipf_proxy_soft_destroy(softc, softp);
330 return NULL;
331 }
332
333 last = NULL;
334 for (ap = ips_proxies; ap->apr_p; ap++) {
335 apn = ipf_proxy_create_clone(softc, ap);
336 if (apn == NULL)
337 goto failed;
338 if (last != NULL)
339 last->apr_next = apn;
340 else
341 softp->ips_proxies = apn;
342 last = apn;
343 }
344 for (ap = ips_proxies; ap != NULL; ap = ap->apr_next) {
345 apn = ipf_proxy_create_clone(softc, ap);
346 if (apn == NULL)
347 goto failed;
348 if (last != NULL)
349 last->apr_next = apn;
350 else
351 softp->ips_proxies = apn;
352 last = apn;
353 }
354
355 return softp;
356 failed:
357 ipf_proxy_soft_destroy(softc, softp);
358 return NULL;
359 }
360
361
362 /* ------------------------------------------------------------------------ */
363 /* Function: ipf_proxy_soft_create */
364 /* Returns: void * - */
365 /* Parameters: softc(I) - pointer to soft context main structure */
366 /* orig(I) - pointer to proxy definition to copy */
367 /* */
368 /* This function clones a proxy definition given by orig and returns a */
369 /* a pointer to that copy. */
370 /* ------------------------------------------------------------------------ */
371 static aproxy_t *
ipf_proxy_create_clone(softc,orig)372 ipf_proxy_create_clone(softc, orig)
373 ipf_main_softc_t *softc;
374 aproxy_t *orig;
375 {
376 aproxy_t *apn;
377
378 KMALLOC(apn, aproxy_t *);
379 if (apn == NULL)
380 return NULL;
381
382 bcopy((char *)orig, (char *)apn, sizeof(*apn));
383 apn->apr_next = NULL;
384 apn->apr_soft = NULL;
385
386 if (apn->apr_create != NULL) {
387 apn->apr_soft = (*apn->apr_create)(softc);
388 if (apn->apr_soft == NULL) {
389 KFREE(apn);
390 return NULL;
391 }
392 }
393
394 apn->apr_parent = orig;
395 orig->apr_clones++;
396
397 return apn;
398 }
399
400
401 /* ------------------------------------------------------------------------ */
402 /* Function: ipf_proxy_soft_create */
403 /* Returns: int - 0 == success, else failure. */
404 /* Parameters: softc(I) - pointer to soft context main structure */
405 /* arg(I) - pointer to proxy contect data */
406 /* */
407 /* Initialise the proxy context and walk through each of the proxies and */
408 /* call its initialisation function. This allows for proxies to do any */
409 /* local setup prior to actual use. */
410 /* ------------------------------------------------------------------------ */
411 int
ipf_proxy_soft_init(softc,arg)412 ipf_proxy_soft_init(softc, arg)
413 ipf_main_softc_t *softc;
414 void *arg;
415 {
416 ipf_proxy_softc_t *softp;
417 aproxy_t *ap;
418 u_int size;
419 int err;
420
421 softp = arg;
422 size = softp->ips_proxy_session_size * sizeof(ap_session_t *);
423
424 KMALLOCS(softp->ips_sess_tab, ap_session_t **, size);
425
426 if (softp->ips_sess_tab == NULL)
427 return -1;
428
429 bzero(softp->ips_sess_tab, size);
430
431 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
432 if (ap->apr_init != NULL) {
433 err = (*ap->apr_init)(softc, ap->apr_soft);
434 if (err != 0)
435 return -2;
436 }
437 }
438 softp->ips_init_run = 1;
439
440 return 0;
441 }
442
443
444 /* ------------------------------------------------------------------------ */
445 /* Function: ipf_proxy_soft_create */
446 /* Returns: int - 0 == success, else failure. */
447 /* Parameters: softc(I) - pointer to soft context main structure */
448 /* arg(I) - pointer to proxy contect data */
449 /* */
450 /* This function should always succeed. It is responsible for ensuring that */
451 /* the proxy context can be safely called when ipf_proxy_soft_destroy is */
452 /* called and suring all of the proxies have similarly been instructed. */
453 /* ------------------------------------------------------------------------ */
454 int
ipf_proxy_soft_fini(softc,arg)455 ipf_proxy_soft_fini(softc, arg)
456 ipf_main_softc_t *softc;
457 void *arg;
458 {
459 ipf_proxy_softc_t *softp = arg;
460 aproxy_t *ap;
461
462 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next) {
463 if (ap->apr_fini != NULL) {
464 (*ap->apr_fini)(softc, ap->apr_soft);
465 }
466 }
467
468 if (softp->ips_sess_tab != NULL) {
469 KFREES(softp->ips_sess_tab,
470 softp->ips_proxy_session_size * sizeof(ap_session_t *));
471 softp->ips_sess_tab = NULL;
472 }
473 softp->ips_init_run = 0;
474
475 return 0;
476 }
477
478
479 /* ------------------------------------------------------------------------ */
480 /* Function: ipf_proxy_soft_destroy */
481 /* Returns: Nil */
482 /* Parameters: softc(I) - pointer to soft context main structure */
483 /* arg(I) - pointer to proxy contect data */
484 /* */
485 /* Free up all of the local data structures allocated during creation. */
486 /* ------------------------------------------------------------------------ */
487 void
ipf_proxy_soft_destroy(softc,arg)488 ipf_proxy_soft_destroy(softc, arg)
489 ipf_main_softc_t *softc;
490 void *arg;
491 {
492 ipf_proxy_softc_t *softp = arg;
493 aproxy_t *ap;
494
495 while ((ap = softp->ips_proxies) != NULL) {
496 softp->ips_proxies = ap->apr_next;
497 if (ap->apr_destroy != NULL)
498 (*ap->apr_destroy)(softc, ap->apr_soft);
499 ap->apr_parent->apr_clones--;
500 KFREE(ap);
501 }
502
503 if (softp->ipf_proxy_tune != NULL) {
504 ipf_tune_array_unlink(softc, softp->ipf_proxy_tune);
505 KFREES(softp->ipf_proxy_tune, sizeof(ipf_proxy_tuneables));
506 softp->ipf_proxy_tune = NULL;
507 }
508
509 KFREE(softp);
510 }
511
512
513 /* ------------------------------------------------------------------------ */
514 /* Function: ipf_proxy_flush */
515 /* Returns: Nil */
516 /* Parameters: arg(I) - pointer to proxy contect data */
517 /* how(I) - indicates the type of flush operation */
518 /* */
519 /* Walk through all of the proxies and pass on the flush command as either */
520 /* a flush or a clear. */
521 /* ------------------------------------------------------------------------ */
522 void
ipf_proxy_flush(arg,how)523 ipf_proxy_flush(arg, how)
524 void *arg;
525 int how;
526 {
527 ipf_proxy_softc_t *softp = arg;
528 aproxy_t *ap;
529
530 switch (how)
531 {
532 case 0 :
533 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
534 if (ap->apr_flush != NULL)
535 (*ap->apr_flush)(ap, how);
536 break;
537 case 1 :
538 for (ap = softp->ips_proxies; ap; ap = ap->apr_next)
539 if (ap->apr_clear != NULL)
540 (*ap->apr_clear)(ap);
541 break;
542 default :
543 break;
544 }
545 }
546
547
548 /* ------------------------------------------------------------------------ */
549 /* Function: ipf_proxy_add */
550 /* Returns: int - 0 == success, else failure. */
551 /* Parameters: ap(I) - pointer to proxy structure */
552 /* */
553 /* Dynamically add a new kernel proxy. Ensure that it is unique in the */
554 /* collection compiled in and dynamically added. */
555 /* ------------------------------------------------------------------------ */
556 int
ipf_proxy_add(arg,ap)557 ipf_proxy_add(arg, ap)
558 void *arg;
559 aproxy_t *ap;
560 {
561 ipf_proxy_softc_t *softp = arg;
562
563 aproxy_t *a;
564
565 for (a = ips_proxies; a->apr_p; a++)
566 if ((a->apr_p == ap->apr_p) &&
567 !strncmp(a->apr_label, ap->apr_label,
568 sizeof(ap->apr_label))) {
569 if (softp->ips_proxy_debug & 0x01)
570 printf("ipf_proxy_add: %s/%d present (B)\n",
571 a->apr_label, a->apr_p);
572 return -1;
573 }
574
575 for (a = ap_proxylist; (a != NULL); a = a->apr_next)
576 if ((a->apr_p == ap->apr_p) &&
577 !strncmp(a->apr_label, ap->apr_label,
578 sizeof(ap->apr_label))) {
579 if (softp->ips_proxy_debug & 0x01)
580 printf("ipf_proxy_add: %s/%d present (D)\n",
581 a->apr_label, a->apr_p);
582 return -1;
583 }
584 ap->apr_next = ap_proxylist;
585 ap_proxylist = ap;
586 if (ap->apr_load != NULL)
587 (*ap->apr_load)();
588 return 0;
589 }
590
591
592 /* ------------------------------------------------------------------------ */
593 /* Function: ipf_proxy_ctl */
594 /* Returns: int - 0 == success, else error */
595 /* Parameters: softc(I) - pointer to soft context main structure */
596 /* arg(I) - pointer to proxy context */
597 /* ctl(I) - pointer to proxy control structure */
598 /* */
599 /* Check to see if the proxy this control request has come through for */
600 /* exists, and if it does and it has a control function then invoke that */
601 /* control function. */
602 /* ------------------------------------------------------------------------ */
603 int
ipf_proxy_ctl(softc,arg,ctl)604 ipf_proxy_ctl(softc, arg, ctl)
605 ipf_main_softc_t *softc;
606 void *arg;
607 ap_ctl_t *ctl;
608 {
609 ipf_proxy_softc_t *softp = arg;
610 aproxy_t *a;
611 int error;
612
613 a = ipf_proxy_lookup(arg, ctl->apc_p, ctl->apc_label);
614 if (a == NULL) {
615 if (softp->ips_proxy_debug & 0x01)
616 printf("ipf_proxy_ctl: can't find %s/%d\n",
617 ctl->apc_label, ctl->apc_p);
618 IPFERROR(80001);
619 error = ESRCH;
620 } else if (a->apr_ctl == NULL) {
621 if (softp->ips_proxy_debug & 0x01)
622 printf("ipf_proxy_ctl: no ctl function for %s/%d\n",
623 ctl->apc_label, ctl->apc_p);
624 IPFERROR(80002);
625 error = ENXIO;
626 } else {
627 error = (*a->apr_ctl)(softc, a->apr_soft, ctl);
628 if ((error != 0) && (softp->ips_proxy_debug & 0x02))
629 printf("ipf_proxy_ctl: %s/%d ctl error %d\n",
630 a->apr_label, a->apr_p, error);
631 }
632 return error;
633 }
634
635
636 /* ------------------------------------------------------------------------ */
637 /* Function: ipf_proxy_del */
638 /* Returns: int - 0 == success, else failure. */
639 /* Parameters: ap(I) - pointer to proxy structure */
640 /* */
641 /* Delete a proxy that has been added dynamically from those available. */
642 /* If it is in use, return 1 (do not destroy NOW), not in use 0 or -1 */
643 /* if it cannot be matched. */
644 /* ------------------------------------------------------------------------ */
645 int
ipf_proxy_del(ap)646 ipf_proxy_del(ap)
647 aproxy_t *ap;
648 {
649 aproxy_t *a, **app;
650
651 for (app = &ap_proxylist; ((a = *app) != NULL); app = &a->apr_next) {
652 if (a == ap) {
653 a->apr_flags |= APR_DELETE;
654 if (ap->apr_ref == 0 && ap->apr_clones == 0) {
655 *app = a->apr_next;
656 return 0;
657 }
658 return 1;
659 }
660 }
661
662 return -1;
663 }
664
665
666 /* ------------------------------------------------------------------------ */
667 /* Function: ipf_proxy_ok */
668 /* Returns: int - 1 == good match else not. */
669 /* Parameters: fin(I) - pointer to packet information */
670 /* tcp(I) - pointer to TCP/UDP header */
671 /* nat(I) - pointer to current NAT session */
672 /* */
673 /* This function extends the NAT matching to ensure that a packet that has */
674 /* arrived matches the proxy information attached to the NAT rule. Notably, */
675 /* if the proxy is scheduled to be deleted then packets will not match the */
676 /* rule even if the rule is still active. */
677 /* ------------------------------------------------------------------------ */
678 int
ipf_proxy_ok(fin,tcp,np)679 ipf_proxy_ok(fin, tcp, np)
680 fr_info_t *fin;
681 tcphdr_t *tcp;
682 ipnat_t *np;
683 {
684 aproxy_t *apr = np->in_apr;
685 u_short dport = np->in_odport;
686
687 if ((apr == NULL) || (apr->apr_flags & APR_DELETE) ||
688 (fin->fin_p != apr->apr_p))
689 return 0;
690 if ((tcp == NULL) && dport)
691 return 0;
692 return 1;
693 }
694
695
696 /* ------------------------------------------------------------------------ */
697 /* Function: ipf_proxy_ioctl */
698 /* Returns: int - 0 == success, else error */
699 /* Parameters: softc(I) - pointer to soft context main structure */
700 /* data(I) - pointer to ioctl data */
701 /* cmd(I) - ioctl command */
702 /* mode(I) - mode bits for device */
703 /* ctx(I) - pointer to context information */
704 /* */
705 /* ------------------------------------------------------------------------ */
706 int
ipf_proxy_ioctl(softc,data,cmd,mode,ctx)707 ipf_proxy_ioctl(softc, data, cmd, mode, ctx)
708 ipf_main_softc_t *softc;
709 caddr_t data;
710 ioctlcmd_t cmd;
711 int mode;
712 void *ctx;
713 {
714 ap_ctl_t ctl;
715 caddr_t ptr;
716 int error;
717
718 mode = mode; /* LINT */
719
720 switch (cmd)
721 {
722 case SIOCPROXY :
723 error = ipf_inobj(softc, data, NULL, &ctl, IPFOBJ_PROXYCTL);
724 if (error != 0) {
725 return error;
726 }
727 ptr = NULL;
728
729 if (ctl.apc_dsize > 0) {
730 KMALLOCS(ptr, caddr_t, ctl.apc_dsize);
731 if (ptr == NULL) {
732 IPFERROR(80003);
733 error = ENOMEM;
734 } else {
735 error = copyinptr(softc, ctl.apc_data, ptr,
736 ctl.apc_dsize);
737 if (error == 0)
738 ctl.apc_data = ptr;
739 }
740 } else {
741 ctl.apc_data = NULL;
742 error = 0;
743 }
744
745 if (error == 0)
746 error = ipf_proxy_ctl(softc, softc->ipf_proxy_soft,
747 &ctl);
748
749 if ((error != 0) && (ptr != NULL)) {
750 KFREES(ptr, ctl.apc_dsize);
751 }
752 break;
753
754 default :
755 IPFERROR(80004);
756 error = EINVAL;
757 }
758 return error;
759 }
760
761
762 /* ------------------------------------------------------------------------ */
763 /* Function: ipf_proxy_match */
764 /* Returns: int - 0 == success, else error */
765 /* Parameters: fin(I) - pointer to packet information */
766 /* nat(I) - pointer to current NAT session */
767 /* */
768 /* If a proxy has a match function, call that to do extended packet */
769 /* matching. Whilst other parts of the NAT code are rather lenient when it */
770 /* comes to the quality of the packet that it will transform, the proxy */
771 /* matching is not because they need to work with data, not just headers. */
772 /* ------------------------------------------------------------------------ */
773 int
ipf_proxy_match(fin,nat)774 ipf_proxy_match(fin, nat)
775 fr_info_t *fin;
776 nat_t *nat;
777 {
778 ipf_main_softc_t *softc = fin->fin_main_soft;
779 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
780 aproxy_t *apr;
781 ipnat_t *ipn;
782 int result;
783
784 ipn = nat->nat_ptr;
785 if (softp->ips_proxy_debug & 0x04)
786 printf("ipf_proxy_match(%lx,%lx) aps %lx ptr %lx\n",
787 (u_long)fin, (u_long)nat, (u_long)nat->nat_aps,
788 (u_long)ipn);
789
790 if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0) {
791 if (softp->ips_proxy_debug & 0x08)
792 printf("ipf_proxy_match: flx 0x%x (BAD|SHORT)\n",
793 fin->fin_flx);
794 return -1;
795 }
796
797 apr = ipn->in_apr;
798 if ((apr == NULL) || (apr->apr_flags & APR_DELETE)) {
799 if (softp->ips_proxy_debug & 0x08)
800 printf("ipf_proxy_match:apr %lx apr_flags 0x%x\n",
801 (u_long)apr, apr ? apr->apr_flags : 0);
802 return -1;
803 }
804
805 if (apr->apr_match != NULL) {
806 result = (*apr->apr_match)(fin, nat->nat_aps, nat);
807 if (result != 0) {
808 if (softp->ips_proxy_debug & 0x08)
809 printf("ipf_proxy_match: result %d\n", result);
810 return -1;
811 }
812 }
813 return 0;
814 }
815
816
817 /* ------------------------------------------------------------------------ */
818 /* Function: ipf_proxy_new */
819 /* Returns: int - 0 == success, else error */
820 /* Parameters: fin(I) - pointer to packet information */
821 /* nat(I) - pointer to current NAT session */
822 /* */
823 /* Allocate a new application proxy structure and fill it in with the */
824 /* relevant details. call the init function once complete, prior to */
825 /* returning. */
826 /* ------------------------------------------------------------------------ */
827 int
ipf_proxy_new(fin,nat)828 ipf_proxy_new(fin, nat)
829 fr_info_t *fin;
830 nat_t *nat;
831 {
832 ipf_main_softc_t *softc = fin->fin_main_soft;
833 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
834 register ap_session_t *aps;
835 aproxy_t *apr;
836
837 if (softp->ips_proxy_debug & 0x04)
838 printf("ipf_proxy_new(%lx,%lx) \n", (u_long)fin, (u_long)nat);
839
840 if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL)) {
841 if (softp->ips_proxy_debug & 0x08)
842 printf("ipf_proxy_new: nat_ptr %lx nat_aps %lx\n",
843 (u_long)nat->nat_ptr, (u_long)nat->nat_aps);
844 return -1;
845 }
846
847 apr = nat->nat_ptr->in_apr;
848
849 if ((apr->apr_flags & APR_DELETE) ||
850 (fin->fin_p != apr->apr_p)) {
851 if (softp->ips_proxy_debug & 0x08)
852 printf("ipf_proxy_new: apr_flags 0x%x p %d/%d\n",
853 apr->apr_flags, fin->fin_p, apr->apr_p);
854 return -1;
855 }
856
857 KMALLOC(aps, ap_session_t *);
858 if (!aps) {
859 if (softp->ips_proxy_debug & 0x08)
860 printf("ipf_proxy_new: malloc failed (%lu)\n",
861 (u_long)sizeof(ap_session_t));
862 return -1;
863 }
864
865 bzero((char *)aps, sizeof(*aps));
866 aps->aps_data = NULL;
867 aps->aps_apr = apr;
868 aps->aps_psiz = 0;
869 if (apr->apr_new != NULL)
870 if ((*apr->apr_new)(apr->apr_soft, fin, aps, nat) == -1) {
871 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) {
872 KFREES(aps->aps_data, aps->aps_psiz);
873 }
874 KFREE(aps);
875 if (softp->ips_proxy_debug & 0x08)
876 printf("ipf_proxy_new: new(%lx) failed\n",
877 (u_long)apr->apr_new);
878 return -1;
879 }
880 aps->aps_nat = nat;
881 aps->aps_next = softp->ips_sess_list;
882 softp->ips_sess_list = aps;
883 nat->nat_aps = aps;
884
885 return 0;
886 }
887
888
889 /* ------------------------------------------------------------------------ */
890 /* Function: ipf_proxy_check */
891 /* Returns: int - -1 == error, 0 == success */
892 /* Parameters: fin(I) - pointer to packet information */
893 /* nat(I) - pointer to current NAT session */
894 /* */
895 /* Check to see if a packet should be passed through an active proxy */
896 /* routine if one has been setup for it. We don't need to check the */
897 /* checksum here if IPFILTER_CKSUM is defined because if it is, a failed */
898 /* check causes FI_BAD to be set. */
899 /* ------------------------------------------------------------------------ */
900 int
ipf_proxy_check(fin,nat)901 ipf_proxy_check(fin, nat)
902 fr_info_t *fin;
903 nat_t *nat;
904 {
905 ipf_main_softc_t *softc = fin->fin_main_soft;
906 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
907 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
908 mb_t *m;
909 #endif
910 tcphdr_t *tcp = NULL;
911 udphdr_t *udp = NULL;
912 ap_session_t *aps;
913 aproxy_t *apr;
914 short adjlen;
915 int dosum;
916 ip_t *ip;
917 short rv;
918 int err;
919 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
920 u_32_t s1, s2, sd;
921 #endif
922
923 if (fin->fin_flx & FI_BAD) {
924 if (softp->ips_proxy_debug & 0x08)
925 printf("ipf_proxy_check: flx 0x%x (BAD)\n",
926 fin->fin_flx);
927 return -1;
928 }
929
930 #ifndef IPFILTER_CKSUM
931 if ((fin->fin_out == 0) && (ipf_checkl4sum(fin) == -1)) {
932 if (softp->ips_proxy_debug & 0x08)
933 printf("ipf_proxy_check: l4 checksum failure %d\n",
934 fin->fin_p);
935 if (fin->fin_p == IPPROTO_TCP)
936 softc->ipf_stats[fin->fin_out].fr_tcpbad++;
937 return -1;
938 }
939 #endif
940
941 aps = nat->nat_aps;
942 if (aps != NULL) {
943 /*
944 * If there is data in this packet to be proxied then try and
945 * get it all into the one buffer, else drop it.
946 */
947 #if defined(MENTAT) || defined(HAVE_M_PULLDOWN)
948 if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE))
949 if (ipf_coalesce(fin) == -1) {
950 if (softp->ips_proxy_debug & 0x08)
951 printf("ipf_proxy_check: %s %x\n",
952 "coalesce failed", fin->fin_flx);
953 return -1;
954 }
955 #endif
956 ip = fin->fin_ip;
957 if (fin->fin_cksum > FI_CK_SUMOK)
958 dosum = 0;
959 else
960 dosum = 1;
961
962 switch (fin->fin_p)
963 {
964 case IPPROTO_TCP :
965 tcp = (tcphdr_t *)fin->fin_dp;
966 #if SOLARIS && defined(_KERNEL) && defined(ICK_VALID)
967 m = fin->fin_qfm;
968 if (dohwcksum && (m->b_ick_flag == ICK_VALID))
969 dosum = 0;
970 #endif
971 break;
972 case IPPROTO_UDP :
973 udp = (udphdr_t *)fin->fin_dp;
974 break;
975 default :
976 break;
977 }
978
979 apr = aps->aps_apr;
980 err = 0;
981 if (fin->fin_out != 0) {
982 if (apr->apr_outpkt != NULL)
983 err = (*apr->apr_outpkt)(apr->apr_soft, fin,
984 aps, nat);
985 } else {
986 if (apr->apr_inpkt != NULL)
987 err = (*apr->apr_inpkt)(apr->apr_soft, fin,
988 aps, nat);
989 }
990
991 rv = APR_EXIT(err);
992 if (((softp->ips_proxy_debug & 0x08) && (rv != 0)) ||
993 (softp->ips_proxy_debug & 0x04))
994 printf("ipf_proxy_check: out %d err %x rv %d\n",
995 fin->fin_out, err, rv);
996 if (rv == 1)
997 return -1;
998
999 if (rv == 2) {
1000 ipf_proxy_deref(apr);
1001 nat->nat_aps = NULL;
1002 return -1;
1003 }
1004
1005 /*
1006 * If err != 0 then the data size of the packet has changed
1007 * so we need to recalculate the header checksums for the
1008 * packet.
1009 */
1010 adjlen = APR_INC(err);
1011 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
1012 s1 = LONG_SUM(fin->fin_plen - adjlen);
1013 s2 = LONG_SUM(fin->fin_plen);
1014 CALC_SUMD(s1, s2, sd);
1015 if ((err != 0) && (fin->fin_cksum < FI_CK_L4PART) &&
1016 fin->fin_v == 4)
1017 ipf_fix_outcksum(0, &ip->ip_sum, sd, 0);
1018 #endif
1019 if (fin->fin_flx & FI_DOCKSUM)
1020 dosum = 1;
1021
1022 /*
1023 * For TCP packets, we may need to adjust the sequence and
1024 * acknowledgement numbers to reflect changes in size of the
1025 * data stream.
1026 *
1027 * For both TCP and UDP, recalculate the layer 4 checksum,
1028 * regardless, as we can't tell (here) if data has been
1029 * changed or not.
1030 */
1031 if (tcp != NULL) {
1032 err = ipf_proxy_fixseqack(fin, ip, aps, adjlen);
1033 if (fin->fin_cksum == FI_CK_L4PART) {
1034 u_short sum = ntohs(tcp->th_sum);
1035 sum += adjlen;
1036 tcp->th_sum = htons(sum);
1037 } else if (fin->fin_cksum < FI_CK_L4PART) {
1038 tcp->th_sum = fr_cksum(fin, ip,
1039 IPPROTO_TCP, tcp);
1040 }
1041 } else if ((udp != NULL) && (udp->uh_sum != 0)) {
1042 if (fin->fin_cksum == FI_CK_L4PART) {
1043 u_short sum = ntohs(udp->uh_sum);
1044 sum += adjlen;
1045 udp->uh_sum = htons(sum);
1046 } else if (dosum) {
1047 udp->uh_sum = fr_cksum(fin, ip,
1048 IPPROTO_UDP, udp);
1049 }
1050 }
1051 aps->aps_bytes += fin->fin_plen;
1052 aps->aps_pkts++;
1053 return 1;
1054 }
1055 return 0;
1056 }
1057
1058
1059 /* ------------------------------------------------------------------------ */
1060 /* Function: ipf_proxy_lookup */
1061 /* Returns: int - -1 == error, 0 == success */
1062 /* Parameters: arg(I) - pointer to proxy context information */
1063 /* pr(I) - protocol number for proxy */
1064 /* name(I) - proxy name */
1065 /* */
1066 /* Search for an proxy by the protocol it is being used with and its name. */
1067 /* ------------------------------------------------------------------------ */
1068 aproxy_t *
ipf_proxy_lookup(arg,pr,name)1069 ipf_proxy_lookup(arg, pr, name)
1070 void *arg;
1071 u_int pr;
1072 char *name;
1073 {
1074 ipf_proxy_softc_t *softp = arg;
1075 aproxy_t *ap;
1076
1077 if (softp->ips_proxy_debug & 0x04)
1078 printf("ipf_proxy_lookup(%d,%s)\n", pr, name);
1079
1080 for (ap = softp->ips_proxies; ap != NULL; ap = ap->apr_next)
1081 if ((ap->apr_p == pr) &&
1082 !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
1083 ap->apr_ref++;
1084 return ap;
1085 }
1086
1087 if (softp->ips_proxy_debug & 0x08)
1088 printf("ipf_proxy_lookup: failed for %d/%s\n", pr, name);
1089 return NULL;
1090 }
1091
1092
1093 /* ------------------------------------------------------------------------ */
1094 /* Function: ipf_proxy_deref */
1095 /* Returns: Nil */
1096 /* Parameters: ap(I) - pointer to proxy structure */
1097 /* */
1098 /* Drop the reference counter associated with the proxy. */
1099 /* ------------------------------------------------------------------------ */
1100 void
ipf_proxy_deref(ap)1101 ipf_proxy_deref(ap)
1102 aproxy_t *ap;
1103 {
1104 ap->apr_ref--;
1105 }
1106
1107
1108 /* ------------------------------------------------------------------------ */
1109 /* Function: ipf_proxy_free */
1110 /* Returns: Nil */
1111 /* Parameters: softc(I) - pointer to soft context main structure */
1112 /* aps(I) - pointer to current proxy session */
1113 /* Locks Held: ipf_nat_new, ipf_nat(W) */
1114 /* */
1115 /* Free up proxy session information allocated to be used with a NAT */
1116 /* session. */
1117 /* ------------------------------------------------------------------------ */
1118 void
ipf_proxy_free(softc,aps)1119 ipf_proxy_free(softc, aps)
1120 ipf_main_softc_t *softc;
1121 ap_session_t *aps;
1122 {
1123 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1124 ap_session_t *a, **ap;
1125 aproxy_t *apr;
1126
1127 if (!aps)
1128 return;
1129
1130 for (ap = &softp->ips_sess_list; ((a = *ap) != NULL); ap = &a->aps_next)
1131 if (a == aps) {
1132 *ap = a->aps_next;
1133 break;
1134 }
1135
1136 apr = aps->aps_apr;
1137 if ((apr != NULL) && (apr->apr_del != NULL))
1138 (*apr->apr_del)(softc, aps);
1139
1140 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0))
1141 KFREES(aps->aps_data, aps->aps_psiz);
1142 KFREE(aps);
1143 }
1144
1145
1146 /* ------------------------------------------------------------------------ */
1147 /* Function: ipf_proxy_fixseqack */
1148 /* Returns: int - 2 if TCP ack/seq is changed, else 0 */
1149 /* Parameters: fin(I) - pointer to packet information */
1150 /* ip(I) - pointer to IP header */
1151 /* nat(I) - pointer to current NAT session */
1152 /* inc(I) - delta to apply to TCP sequence numbering */
1153 /* */
1154 /* Adjust the TCP sequence/acknowledge numbers in the TCP header based on */
1155 /* whether or not the new header is past the point at which an adjustment */
1156 /* occurred. This might happen because of (say) an FTP string being changed */
1157 /* and the new string being a different length to the old. */
1158 /* ------------------------------------------------------------------------ */
1159 static int
ipf_proxy_fixseqack(fin,ip,aps,inc)1160 ipf_proxy_fixseqack(fin, ip, aps, inc)
1161 fr_info_t *fin;
1162 ip_t *ip;
1163 ap_session_t *aps;
1164 int inc;
1165 {
1166 ipf_main_softc_t *softc = fin->fin_main_soft;
1167 ipf_proxy_softc_t *softp = softc->ipf_proxy_soft;
1168 int sel, ch = 0, out, nlen;
1169 u_32_t seq1, seq2;
1170 tcphdr_t *tcp;
1171 short inc2;
1172
1173 tcp = (tcphdr_t *)fin->fin_dp;
1174 out = fin->fin_out;
1175 /*
1176 * ip_len has already been adjusted by 'inc'.
1177 */
1178 nlen = fin->fin_dlen;
1179 nlen -= (TCP_OFF(tcp) << 2);
1180
1181 inc2 = inc;
1182 inc = (int)inc2;
1183
1184 if (out != 0) {
1185 seq1 = (u_32_t)ntohl(tcp->th_seq);
1186 sel = aps->aps_sel[out];
1187
1188 /* switch to other set ? */
1189 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1190 (seq1 > aps->aps_seqmin[!sel])) {
1191 if (softp->ips_proxy_debug & 0x10)
1192 printf("proxy out switch set seq %d -> %d %x > %x\n",
1193 sel, !sel, seq1,
1194 aps->aps_seqmin[!sel]);
1195 sel = aps->aps_sel[out] = !sel;
1196 }
1197
1198 if (aps->aps_seqoff[sel]) {
1199 seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel];
1200 if (seq1 > seq2) {
1201 seq2 = aps->aps_seqoff[sel];
1202 seq1 += seq2;
1203 tcp->th_seq = htonl(seq1);
1204 ch = 1;
1205 }
1206 }
1207
1208 if (inc && (seq1 > aps->aps_seqmin[!sel])) {
1209 aps->aps_seqmin[sel] = seq1 + nlen - 1;
1210 aps->aps_seqoff[sel] = aps->aps_seqoff[sel] + inc;
1211 if (softp->ips_proxy_debug & 0x10)
1212 printf("proxy seq set %d at %x to %d + %d\n",
1213 sel, aps->aps_seqmin[sel],
1214 aps->aps_seqoff[sel], inc);
1215 }
1216
1217 /***/
1218
1219 seq1 = ntohl(tcp->th_ack);
1220 sel = aps->aps_sel[1 - out];
1221
1222 /* switch to other set ? */
1223 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1224 (seq1 > aps->aps_ackmin[!sel])) {
1225 if (softp->ips_proxy_debug & 0x10)
1226 printf("proxy out switch set ack %d -> %d %x > %x\n",
1227 sel, !sel, seq1,
1228 aps->aps_ackmin[!sel]);
1229 sel = aps->aps_sel[1 - out] = !sel;
1230 }
1231
1232 if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) {
1233 seq2 = aps->aps_ackoff[sel];
1234 tcp->th_ack = htonl(seq1 - seq2);
1235 ch = 1;
1236 }
1237 } else {
1238 seq1 = ntohl(tcp->th_seq);
1239 sel = aps->aps_sel[out];
1240
1241 /* switch to other set ? */
1242 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
1243 (seq1 > aps->aps_ackmin[!sel])) {
1244 if (softp->ips_proxy_debug & 0x10)
1245 printf("proxy in switch set ack %d -> %d %x > %x\n",
1246 sel, !sel, seq1, aps->aps_ackmin[!sel]);
1247 sel = aps->aps_sel[out] = !sel;
1248 }
1249
1250 if (aps->aps_ackoff[sel]) {
1251 seq2 = aps->aps_ackmin[sel] - aps->aps_ackoff[sel];
1252 if (seq1 > seq2) {
1253 seq2 = aps->aps_ackoff[sel];
1254 seq1 += seq2;
1255 tcp->th_seq = htonl(seq1);
1256 ch = 1;
1257 }
1258 }
1259
1260 if (inc && (seq1 > aps->aps_ackmin[!sel])) {
1261 aps->aps_ackmin[!sel] = seq1 + nlen - 1;
1262 aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc;
1263
1264 if (softp->ips_proxy_debug & 0x10)
1265 printf("proxy ack set %d at %x to %d + %d\n",
1266 !sel, aps->aps_seqmin[!sel],
1267 aps->aps_seqoff[sel], inc);
1268 }
1269
1270 /***/
1271
1272 seq1 = ntohl(tcp->th_ack);
1273 sel = aps->aps_sel[1 - out];
1274
1275 /* switch to other set ? */
1276 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
1277 (seq1 > aps->aps_seqmin[!sel])) {
1278 if (softp->ips_proxy_debug & 0x10)
1279 printf("proxy in switch set seq %d -> %d %x > %x\n",
1280 sel, !sel, seq1, aps->aps_seqmin[!sel]);
1281 sel = aps->aps_sel[1 - out] = !sel;
1282 }
1283
1284 if (aps->aps_seqoff[sel] != 0) {
1285 if (softp->ips_proxy_debug & 0x10)
1286 printf("sel %d seqoff %d seq1 %x seqmin %x\n",
1287 sel, aps->aps_seqoff[sel], seq1,
1288 aps->aps_seqmin[sel]);
1289 if (seq1 > aps->aps_seqmin[sel]) {
1290 seq2 = aps->aps_seqoff[sel];
1291 tcp->th_ack = htonl(seq1 - seq2);
1292 ch = 1;
1293 }
1294 }
1295 }
1296
1297 if (softp->ips_proxy_debug & 0x10)
1298 printf("ipf_proxy_fixseqack: seq %u ack %u\n",
1299 (u_32_t)ntohl(tcp->th_seq), (u_32_t)ntohl(tcp->th_ack));
1300 return ch ? 2 : 0;
1301 }
1302
1303
1304 /* ------------------------------------------------------------------------ */
1305 /* Function: ipf_proxy_rule_rev */
1306 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1307 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1308 /* */
1309 /* This function creates a NAT rule that is based upon the reverse packet */
1310 /* flow associated with this NAT session. Thus if this NAT session was */
1311 /* created with a map rule then this function will create a rdr rule. */
1312 /* Only address fields and network interfaces are assigned in this function */
1313 /* and the address fields are formed such that an exact is required. If the */
1314 /* original rule had a netmask, that is not replicated here not is it */
1315 /* desired. The ultimate goal here is to create a NAT rule to support a NAT */
1316 /* session being created that does not have a user configured rule. The */
1317 /* classic example is supporting the FTP proxy, where a data channel needs */
1318 /* to be setup, based on the addresses used for the control connection. In */
1319 /* that case, this function is used to handle creating NAT rules to support */
1320 /* data connections with the PORT and EPRT commands. */
1321 /* ------------------------------------------------------------------------ */
1322 ipnat_t *
ipf_proxy_rule_rev(nat)1323 ipf_proxy_rule_rev(nat)
1324 nat_t *nat;
1325 {
1326 ipnat_t *old;
1327 ipnat_t *ipn;
1328 int size;
1329
1330 old = nat->nat_ptr;
1331 size = old->in_size;
1332
1333 KMALLOCS(ipn, ipnat_t *, size);
1334 if (ipn == NULL)
1335 return NULL;
1336
1337 bzero((char *)ipn, size);
1338
1339 ipn->in_use = 1;
1340 ipn->in_hits = 1;
1341 ipn->in_ippip = 1;
1342 ipn->in_apr = NULL;
1343 ipn->in_size = size;
1344 ipn->in_pr[0] = old->in_pr[1];
1345 ipn->in_pr[1] = old->in_pr[0];
1346 ipn->in_v[0] = old->in_v[1];
1347 ipn->in_v[1] = old->in_v[0];
1348 ipn->in_ifps[0] = old->in_ifps[1];
1349 ipn->in_ifps[1] = old->in_ifps[0];
1350 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1351
1352 ipn->in_nsrcip6 = nat->nat_odst6;
1353 ipn->in_osrcip6 = nat->nat_ndst6;
1354
1355 if ((old->in_redir & NAT_REDIRECT) != 0) {
1356 ipn->in_redir = NAT_MAP;
1357 if (ipn->in_v[0] == 4) {
1358 ipn->in_snip = ntohl(nat->nat_odstaddr);
1359 ipn->in_dnip = ntohl(nat->nat_nsrcaddr);
1360 } else {
1361 #ifdef USE_INET6
1362 ipn->in_snip6 = nat->nat_odst6;
1363 ipn->in_dnip6 = nat->nat_nsrc6;
1364 #endif
1365 }
1366 ipn->in_ndstip6 = nat->nat_nsrc6;
1367 ipn->in_odstip6 = nat->nat_osrc6;
1368 } else {
1369 ipn->in_redir = NAT_REDIRECT;
1370 if (ipn->in_v[0] == 4) {
1371 ipn->in_snip = ntohl(nat->nat_odstaddr);
1372 ipn->in_dnip = ntohl(nat->nat_osrcaddr);
1373 } else {
1374 #ifdef USE_INET6
1375 ipn->in_snip6 = nat->nat_odst6;
1376 ipn->in_dnip6 = nat->nat_osrc6;
1377 #endif
1378 }
1379 ipn->in_ndstip6 = nat->nat_osrc6;
1380 ipn->in_odstip6 = nat->nat_nsrc6;
1381 }
1382
1383 IP6_SETONES(&ipn->in_osrcmsk6);
1384 IP6_SETONES(&ipn->in_nsrcmsk6);
1385 IP6_SETONES(&ipn->in_odstmsk6);
1386 IP6_SETONES(&ipn->in_ndstmsk6);
1387
1388 ipn->in_namelen = old->in_namelen;
1389 ipn->in_ifnames[0] = old->in_ifnames[1];
1390 ipn->in_ifnames[1] = old->in_ifnames[0];
1391 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1392 MUTEX_INIT(&ipn->in_lock, "ipnat rev rule lock");
1393
1394 return ipn;
1395 }
1396
1397
1398 /* ------------------------------------------------------------------------ */
1399 /* Function: ipf_proxy_rule_fwd */
1400 /* Returns: ipnat_t * - NULL = failure, else pointer to new rule */
1401 /* Parameters: nat(I) - pointer to NAT session to create rule from */
1402 /* */
1403 /* The purpose and rationale of this function is much the same as the above */
1404 /* function, ipf_proxy_rule_rev, except that a rule is created that matches */
1405 /* the same direction as that of the existing NAT session. Thus if this NAT */
1406 /* session was created with a map rule then this function will also create */
1407 /* a data structure to represent a map rule. Whereas ipf_proxy_rule_rev is */
1408 /* used to support PORT/EPRT, this function supports PASV/EPSV. */
1409 /* ------------------------------------------------------------------------ */
1410 ipnat_t *
ipf_proxy_rule_fwd(nat)1411 ipf_proxy_rule_fwd(nat)
1412 nat_t *nat;
1413 {
1414 ipnat_t *old;
1415 ipnat_t *ipn;
1416 int size;
1417
1418 old = nat->nat_ptr;
1419 size = old->in_size;
1420
1421 KMALLOCS(ipn, ipnat_t *, size);
1422 if (ipn == NULL)
1423 return NULL;
1424
1425 bzero((char *)ipn, size);
1426
1427 ipn->in_use = 1;
1428 ipn->in_hits = 1;
1429 ipn->in_ippip = 1;
1430 ipn->in_apr = NULL;
1431 ipn->in_size = size;
1432 ipn->in_pr[0] = old->in_pr[0];
1433 ipn->in_pr[1] = old->in_pr[1];
1434 ipn->in_v[0] = old->in_v[0];
1435 ipn->in_v[1] = old->in_v[1];
1436 ipn->in_ifps[0] = nat->nat_ifps[0];
1437 ipn->in_ifps[1] = nat->nat_ifps[1];
1438 ipn->in_flags = (old->in_flags | IPN_PROXYRULE);
1439
1440 ipn->in_nsrcip6 = nat->nat_nsrc6;
1441 ipn->in_osrcip6 = nat->nat_osrc6;
1442 ipn->in_ndstip6 = nat->nat_ndst6;
1443 ipn->in_odstip6 = nat->nat_odst6;
1444 ipn->in_redir = old->in_redir;
1445
1446 if (ipn->in_v[0] == 4) {
1447 ipn->in_snip = ntohl(nat->nat_nsrcaddr);
1448 ipn->in_dnip = ntohl(nat->nat_ndstaddr);
1449 } else {
1450 #ifdef USE_INET6
1451 ipn->in_snip6 = nat->nat_nsrc6;
1452 ipn->in_dnip6 = nat->nat_ndst6;
1453 #endif
1454 }
1455
1456 IP6_SETONES(&ipn->in_osrcmsk6);
1457 IP6_SETONES(&ipn->in_nsrcmsk6);
1458 IP6_SETONES(&ipn->in_odstmsk6);
1459 IP6_SETONES(&ipn->in_ndstmsk6);
1460
1461 ipn->in_namelen = old->in_namelen;
1462 ipn->in_ifnames[0] = old->in_ifnames[0];
1463 ipn->in_ifnames[1] = old->in_ifnames[1];
1464 bcopy(old->in_names, ipn->in_names, ipn->in_namelen);
1465 MUTEX_INIT(&ipn->in_lock, "ipnat fwd rule lock");
1466
1467 return ipn;
1468 }
1469