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(lint)
9 static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
10 static const char rcsid[] = "@(#)$Id$";
11 #endif
12
13 #if defined(KERNEL) || defined(_KERNEL)
14 # undef KERNEL
15 # undef _KERNEL
16 # define KERNEL 1
17 # define _KERNEL 1
18 #endif
19 #if defined(__FreeBSD__) && \
20 !defined(KLD_MODULE) && !defined(IPFILTER_LKM)
21 # include "opt_inet6.h"
22 #endif
23 #include <sys/param.h>
24 #include <sys/errno.h>
25 #include <sys/types.h>
26 #include <sys/file.h>
27 #include <sys/fcntl.h>
28 #include <sys/filio.h>
29 #include <sys/time.h>
30 #include <sys/systm.h>
31 #include <sys/dirent.h>
32 #if defined(__FreeBSD__)
33 # include <sys/jail.h>
34 #endif
35 #include <sys/malloc.h>
36 #include <sys/mbuf.h>
37 #include <sys/sockopt.h>
38 #include <sys/socket.h>
39 #include <sys/selinfo.h>
40 #include <netinet/tcp_var.h>
41 #include <net/if.h>
42 #include <net/if_var.h>
43 #include <net/netisr.h>
44 #include <net/route.h>
45 #include <netinet/in.h>
46 #include <netinet/in_fib.h>
47 #include <netinet/in_var.h>
48 #include <netinet/in_systm.h>
49 #include <netinet/ip.h>
50 #include <netinet/ip_var.h>
51 #include <netinet/tcp.h>
52 #include <net/vnet.h>
53 #include <netinet/udp.h>
54 #include <netinet/tcpip.h>
55 #include <netinet/ip_icmp.h>
56 #include "netinet/ip_compat.h"
57 #ifdef USE_INET6
58 # include <netinet/icmp6.h>
59 #endif
60 #include "netinet/ip_fil.h"
61 #include "netinet/ip_nat.h"
62 #include "netinet/ip_frag.h"
63 #include "netinet/ip_state.h"
64 #include "netinet/ip_proxy.h"
65 #include "netinet/ip_auth.h"
66 #include "netinet/ip_sync.h"
67 #include "netinet/ip_lookup.h"
68 #include "netinet/ip_dstlist.h"
69 #ifdef IPFILTER_SCAN
70 # include "netinet/ip_scan.h"
71 #endif
72 #include "netinet/ip_pool.h"
73 #include <sys/malloc.h>
74 #include <sys/kernel.h>
75 #ifdef CSUM_DATA_VALID
76 # include <machine/in_cksum.h>
77 #endif
78 extern int ip_optcopy(struct ip *, struct ip *);
79
80 #ifdef IPFILTER_M_IPFILTER
81 MALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures");
82 #endif
83
84
85 static int ipf_send_ip(fr_info_t *, mb_t *);
86 static void ipf_timer_func(void *arg);
87
88 VNET_DEFINE(ipf_main_softc_t, ipfmain) = {
89 .ipf_running = -2,
90 };
91 #define V_ipfmain VNET(ipfmain)
92
93 #include <sys/conf.h>
94 #include <net/pfil.h>
95
96 static eventhandler_tag ipf_arrivetag, ipf_departtag;
97 #if 0
98 /*
99 * Disable the "cloner" event handler; we are getting interface
100 * events before the firewall is fully initiallized and also no vnet
101 * information thus leading to uninitialised memory accesses.
102 * In addition it is unclear why we need it in first place.
103 * If it turns out to be needed, well need a dedicated event handler
104 * for it to deal with the ifc and the correct vnet.
105 */
106 static eventhandler_tag ipf_clonetag;
107 #endif
108
109 static void ipf_ifevent(void *arg, struct ifnet *ifp);
110
ipf_ifevent(arg,ifp)111 static void ipf_ifevent(arg, ifp)
112 void *arg;
113 struct ifnet *ifp;
114 {
115
116 CURVNET_SET(ifp->if_vnet);
117 if (V_ipfmain.ipf_running > 0)
118 ipf_sync(&V_ipfmain, NULL);
119 CURVNET_RESTORE();
120 }
121
122
123
124 static int
ipf_check_wrapper(void * arg,struct mbuf ** mp,struct ifnet * ifp,int dir)125 ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
126 {
127 struct ip *ip = mtod(*mp, struct ip *);
128 int rv;
129
130 /*
131 * IPFilter expects evreything in network byte order
132 */
133 #if (__FreeBSD_version < 1000019)
134 ip->ip_len = htons(ip->ip_len);
135 ip->ip_off = htons(ip->ip_off);
136 #endif
137 CURVNET_SET(ifp->if_vnet);
138 rv = ipf_check(&V_ipfmain, ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT),
139 mp);
140 CURVNET_RESTORE();
141 #if (__FreeBSD_version < 1000019)
142 if ((rv == 0) && (*mp != NULL)) {
143 ip = mtod(*mp, struct ip *);
144 ip->ip_len = ntohs(ip->ip_len);
145 ip->ip_off = ntohs(ip->ip_off);
146 }
147 #endif
148 return rv;
149 }
150
151 # ifdef USE_INET6
152 # include <netinet/ip6.h>
153
154 static int
ipf_check_wrapper6(void * arg,struct mbuf ** mp,struct ifnet * ifp,int dir)155 ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
156 {
157 int error;
158
159 CURVNET_SET(ifp->if_vnet);
160 error = ipf_check(&V_ipfmain, mtod(*mp, struct ip *),
161 sizeof(struct ip6_hdr), ifp, (dir == PFIL_OUT), mp);
162 CURVNET_RESTORE();
163 return (error);
164 }
165 # endif
166 #if defined(IPFILTER_LKM)
ipf_identify(s)167 int ipf_identify(s)
168 char *s;
169 {
170 if (strcmp(s, "ipl") == 0)
171 return 1;
172 return 0;
173 }
174 #endif /* IPFILTER_LKM */
175
176
177 static void
ipf_timer_func(arg)178 ipf_timer_func(arg)
179 void *arg;
180 {
181 ipf_main_softc_t *softc = arg;
182 SPL_INT(s);
183
184 SPL_NET(s);
185 READ_ENTER(&softc->ipf_global);
186
187 if (softc->ipf_running > 0)
188 ipf_slowtimer(softc);
189
190 if (softc->ipf_running == -1 || softc->ipf_running == 1) {
191 #if 0
192 softc->ipf_slow_ch = timeout(ipf_timer_func, softc, hz/2);
193 #endif
194 callout_init(&softc->ipf_slow_ch, 1);
195 callout_reset(&softc->ipf_slow_ch,
196 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
197 ipf_timer_func, softc);
198 }
199 RWLOCK_EXIT(&softc->ipf_global);
200 SPL_X(s);
201 }
202
203
204 int
ipfattach(softc)205 ipfattach(softc)
206 ipf_main_softc_t *softc;
207 {
208 #ifdef USE_SPL
209 int s;
210 #endif
211
212 SPL_NET(s);
213 if (softc->ipf_running > 0) {
214 SPL_X(s);
215 return EBUSY;
216 }
217
218 if (ipf_init_all(softc) < 0) {
219 SPL_X(s);
220 return EIO;
221 }
222
223
224 bzero((char *)V_ipfmain.ipf_selwait, sizeof(V_ipfmain.ipf_selwait));
225 softc->ipf_running = 1;
226
227 if (softc->ipf_control_forwarding & 1)
228 V_ipforwarding = 1;
229
230 SPL_X(s);
231 #if 0
232 softc->ipf_slow_ch = timeout(ipf_timer_func, softc,
233 (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
234 #endif
235 callout_init(&softc->ipf_slow_ch, 1);
236 callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
237 ipf_timer_func, softc);
238 return 0;
239 }
240
241
242 /*
243 * Disable the filter by removing the hooks from the IP input/output
244 * stream.
245 */
246 int
ipfdetach(softc)247 ipfdetach(softc)
248 ipf_main_softc_t *softc;
249 {
250 #ifdef USE_SPL
251 int s;
252 #endif
253
254 if (softc->ipf_control_forwarding & 2)
255 V_ipforwarding = 0;
256
257 SPL_NET(s);
258
259 #if 0
260 if (softc->ipf_slow_ch.callout != NULL)
261 untimeout(ipf_timer_func, softc, softc->ipf_slow_ch);
262 bzero(&softc->ipf_slow, sizeof(softc->ipf_slow));
263 #endif
264 callout_drain(&softc->ipf_slow_ch);
265
266 ipf_fini_all(softc);
267
268 softc->ipf_running = -2;
269
270 SPL_X(s);
271
272 return 0;
273 }
274
275
276 /*
277 * Filter ioctl interface.
278 */
279 int
ipfioctl(dev,cmd,data,mode,p)280 ipfioctl(dev, cmd, data, mode, p)
281 struct thread *p;
282 #define p_cred td_ucred
283 #define p_uid td_ucred->cr_ruid
284 struct cdev *dev;
285 ioctlcmd_t cmd;
286 caddr_t data;
287 int mode;
288 {
289 int error = 0, unit = 0;
290 SPL_INT(s);
291
292 CURVNET_SET(TD_TO_VNET(p));
293 if (securelevel_ge(p->p_cred, 3) && (mode & FWRITE))
294 {
295 V_ipfmain.ipf_interror = 130001;
296 CURVNET_RESTORE();
297 return EPERM;
298 }
299
300 unit = GET_MINOR(dev);
301 if ((IPL_LOGMAX < unit) || (unit < 0)) {
302 V_ipfmain.ipf_interror = 130002;
303 CURVNET_RESTORE();
304 return ENXIO;
305 }
306
307 if (V_ipfmain.ipf_running <= 0) {
308 if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) {
309 V_ipfmain.ipf_interror = 130003;
310 CURVNET_RESTORE();
311 return EIO;
312 }
313 if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET &&
314 cmd != SIOCIPFSET && cmd != SIOCFRENB &&
315 cmd != SIOCGETFS && cmd != SIOCGETFF &&
316 cmd != SIOCIPFINTERROR) {
317 V_ipfmain.ipf_interror = 130004;
318 CURVNET_RESTORE();
319 return EIO;
320 }
321 }
322
323 SPL_NET(s);
324
325 error = ipf_ioctlswitch(&V_ipfmain, unit, data, cmd, mode, p->p_uid, p);
326 CURVNET_RESTORE();
327 if (error != -1) {
328 SPL_X(s);
329 return error;
330 }
331
332 SPL_X(s);
333
334 return error;
335 }
336
337
338 /*
339 * ipf_send_reset - this could conceivably be a call to tcp_respond(), but that
340 * requires a large amount of setting up and isn't any more efficient.
341 */
342 int
ipf_send_reset(fin)343 ipf_send_reset(fin)
344 fr_info_t *fin;
345 {
346 struct tcphdr *tcp, *tcp2;
347 int tlen = 0, hlen;
348 struct mbuf *m;
349 #ifdef USE_INET6
350 ip6_t *ip6;
351 #endif
352 ip_t *ip;
353
354 tcp = fin->fin_dp;
355 if (tcp->th_flags & TH_RST)
356 return -1; /* feedback loop */
357
358 if (ipf_checkl4sum(fin) == -1)
359 return -1;
360
361 tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) +
362 ((tcp->th_flags & TH_SYN) ? 1 : 0) +
363 ((tcp->th_flags & TH_FIN) ? 1 : 0);
364
365 #ifdef USE_INET6
366 hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
367 #else
368 hlen = sizeof(ip_t);
369 #endif
370 #ifdef MGETHDR
371 MGETHDR(m, M_NOWAIT, MT_HEADER);
372 #else
373 MGET(m, M_NOWAIT, MT_HEADER);
374 #endif
375 if (m == NULL)
376 return -1;
377 if (sizeof(*tcp2) + hlen > MLEN) {
378 if (!(MCLGET(m, M_NOWAIT))) {
379 FREE_MB_T(m);
380 return -1;
381 }
382 }
383
384 m->m_len = sizeof(*tcp2) + hlen;
385 m->m_data += max_linkhdr;
386 m->m_pkthdr.len = m->m_len;
387 m->m_pkthdr.rcvif = (struct ifnet *)0;
388 ip = mtod(m, struct ip *);
389 bzero((char *)ip, hlen);
390 #ifdef USE_INET6
391 ip6 = (ip6_t *)ip;
392 #endif
393 tcp2 = (struct tcphdr *)((char *)ip + hlen);
394 tcp2->th_sport = tcp->th_dport;
395 tcp2->th_dport = tcp->th_sport;
396
397 if (tcp->th_flags & TH_ACK) {
398 tcp2->th_seq = tcp->th_ack;
399 tcp2->th_flags = TH_RST;
400 tcp2->th_ack = 0;
401 } else {
402 tcp2->th_seq = 0;
403 tcp2->th_ack = ntohl(tcp->th_seq);
404 tcp2->th_ack += tlen;
405 tcp2->th_ack = htonl(tcp2->th_ack);
406 tcp2->th_flags = TH_RST|TH_ACK;
407 }
408 TCP_X2_A(tcp2, 0);
409 TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2);
410 tcp2->th_win = tcp->th_win;
411 tcp2->th_sum = 0;
412 tcp2->th_urp = 0;
413
414 #ifdef USE_INET6
415 if (fin->fin_v == 6) {
416 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
417 ip6->ip6_plen = htons(sizeof(struct tcphdr));
418 ip6->ip6_nxt = IPPROTO_TCP;
419 ip6->ip6_hlim = 0;
420 ip6->ip6_src = fin->fin_dst6.in6;
421 ip6->ip6_dst = fin->fin_src6.in6;
422 tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
423 sizeof(*ip6), sizeof(*tcp2));
424 return ipf_send_ip(fin, m);
425 }
426 #endif
427 ip->ip_p = IPPROTO_TCP;
428 ip->ip_len = htons(sizeof(struct tcphdr));
429 ip->ip_src.s_addr = fin->fin_daddr;
430 ip->ip_dst.s_addr = fin->fin_saddr;
431 tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
432 ip->ip_len = htons(hlen + sizeof(*tcp2));
433 return ipf_send_ip(fin, m);
434 }
435
436
437 /*
438 * ip_len must be in network byte order when called.
439 */
440 static int
ipf_send_ip(fin,m)441 ipf_send_ip(fin, m)
442 fr_info_t *fin;
443 mb_t *m;
444 {
445 fr_info_t fnew;
446 ip_t *ip, *oip;
447 int hlen;
448
449 ip = mtod(m, ip_t *);
450 bzero((char *)&fnew, sizeof(fnew));
451 fnew.fin_main_soft = fin->fin_main_soft;
452
453 IP_V_A(ip, fin->fin_v);
454 switch (fin->fin_v)
455 {
456 case 4 :
457 oip = fin->fin_ip;
458 hlen = sizeof(*oip);
459 fnew.fin_v = 4;
460 fnew.fin_p = ip->ip_p;
461 fnew.fin_plen = ntohs(ip->ip_len);
462 IP_HL_A(ip, sizeof(*oip) >> 2);
463 ip->ip_tos = oip->ip_tos;
464 ip->ip_id = fin->fin_ip->ip_id;
465 ip->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
466 ip->ip_ttl = V_ip_defttl;
467 ip->ip_sum = 0;
468 break;
469 #ifdef USE_INET6
470 case 6 :
471 {
472 ip6_t *ip6 = (ip6_t *)ip;
473
474 ip6->ip6_vfc = 0x60;
475 ip6->ip6_hlim = IPDEFTTL;
476
477 hlen = sizeof(*ip6);
478 fnew.fin_p = ip6->ip6_nxt;
479 fnew.fin_v = 6;
480 fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen;
481 break;
482 }
483 #endif
484 default :
485 return EINVAL;
486 }
487 #ifdef IPSEC
488 m->m_pkthdr.rcvif = NULL;
489 #endif
490
491 fnew.fin_ifp = fin->fin_ifp;
492 fnew.fin_flx = FI_NOCKSUM;
493 fnew.fin_m = m;
494 fnew.fin_ip = ip;
495 fnew.fin_mp = &m;
496 fnew.fin_hlen = hlen;
497 fnew.fin_dp = (char *)ip + hlen;
498 (void) ipf_makefrip(hlen, ip, &fnew);
499
500 return ipf_fastroute(m, &m, &fnew, NULL);
501 }
502
503
504 int
ipf_send_icmp_err(type,fin,dst)505 ipf_send_icmp_err(type, fin, dst)
506 int type;
507 fr_info_t *fin;
508 int dst;
509 {
510 int err, hlen, xtra, iclen, ohlen, avail, code;
511 struct in_addr dst4;
512 struct icmp *icmp;
513 struct mbuf *m;
514 i6addr_t dst6;
515 void *ifp;
516 #ifdef USE_INET6
517 ip6_t *ip6;
518 #endif
519 ip_t *ip, *ip2;
520
521 if ((type < 0) || (type >= ICMP_MAXTYPE))
522 return -1;
523
524 code = fin->fin_icode;
525 #ifdef USE_INET6
526 /* See NetBSD ip_fil_netbsd.c r1.4: */
527 if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int)))
528 return -1;
529 #endif
530
531 if (ipf_checkl4sum(fin) == -1)
532 return -1;
533 #ifdef MGETHDR
534 MGETHDR(m, M_NOWAIT, MT_HEADER);
535 #else
536 MGET(m, M_NOWAIT, MT_HEADER);
537 #endif
538 if (m == NULL)
539 return -1;
540 avail = MHLEN;
541
542 xtra = 0;
543 hlen = 0;
544 ohlen = 0;
545 dst4.s_addr = 0;
546 ifp = fin->fin_ifp;
547 if (fin->fin_v == 4) {
548 if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT))
549 switch (ntohs(fin->fin_data[0]) >> 8)
550 {
551 case ICMP_ECHO :
552 case ICMP_TSTAMP :
553 case ICMP_IREQ :
554 case ICMP_MASKREQ :
555 break;
556 default :
557 FREE_MB_T(m);
558 return 0;
559 }
560
561 if (dst == 0) {
562 if (ipf_ifpaddr(&V_ipfmain, 4, FRI_NORMAL, ifp,
563 &dst6, NULL) == -1) {
564 FREE_MB_T(m);
565 return -1;
566 }
567 dst4 = dst6.in4;
568 } else
569 dst4.s_addr = fin->fin_daddr;
570
571 hlen = sizeof(ip_t);
572 ohlen = fin->fin_hlen;
573 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
574 if (fin->fin_hlen < fin->fin_plen)
575 xtra = MIN(fin->fin_dlen, 8);
576 else
577 xtra = 0;
578 }
579
580 #ifdef USE_INET6
581 else if (fin->fin_v == 6) {
582 hlen = sizeof(ip6_t);
583 ohlen = sizeof(ip6_t);
584 iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
585 type = icmptoicmp6types[type];
586 if (type == ICMP6_DST_UNREACH)
587 code = icmptoicmp6unreach[code];
588
589 if (iclen + max_linkhdr + fin->fin_plen > avail) {
590 if (!(MCLGET(m, M_NOWAIT))) {
591 FREE_MB_T(m);
592 return -1;
593 }
594 avail = MCLBYTES;
595 }
596 xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr);
597 xtra = MIN(xtra, IPV6_MMTU - iclen);
598 if (dst == 0) {
599 if (ipf_ifpaddr(&V_ipfmain, 6, FRI_NORMAL, ifp,
600 &dst6, NULL) == -1) {
601 FREE_MB_T(m);
602 return -1;
603 }
604 } else
605 dst6 = fin->fin_dst6;
606 }
607 #endif
608 else {
609 FREE_MB_T(m);
610 return -1;
611 }
612
613 avail -= (max_linkhdr + iclen);
614 if (avail < 0) {
615 FREE_MB_T(m);
616 return -1;
617 }
618 if (xtra > avail)
619 xtra = avail;
620 iclen += xtra;
621 m->m_data += max_linkhdr;
622 m->m_pkthdr.rcvif = (struct ifnet *)0;
623 m->m_pkthdr.len = iclen;
624 m->m_len = iclen;
625 ip = mtod(m, ip_t *);
626 icmp = (struct icmp *)((char *)ip + hlen);
627 ip2 = (ip_t *)&icmp->icmp_ip;
628
629 icmp->icmp_type = type;
630 icmp->icmp_code = fin->fin_icode;
631 icmp->icmp_cksum = 0;
632 #ifdef icmp_nextmtu
633 if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) {
634 if (fin->fin_mtu != 0) {
635 icmp->icmp_nextmtu = htons(fin->fin_mtu);
636
637 } else if (ifp != NULL) {
638 icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp));
639
640 } else { /* make up a number... */
641 icmp->icmp_nextmtu = htons(fin->fin_plen - 20);
642 }
643 }
644 #endif
645
646 bcopy((char *)fin->fin_ip, (char *)ip2, ohlen);
647
648 #ifdef USE_INET6
649 ip6 = (ip6_t *)ip;
650 if (fin->fin_v == 6) {
651 ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
652 ip6->ip6_plen = htons(iclen - hlen);
653 ip6->ip6_nxt = IPPROTO_ICMPV6;
654 ip6->ip6_hlim = 0;
655 ip6->ip6_src = dst6.in6;
656 ip6->ip6_dst = fin->fin_src6.in6;
657 if (xtra > 0)
658 bcopy((char *)fin->fin_ip + ohlen,
659 (char *)&icmp->icmp_ip + ohlen, xtra);
660 icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6,
661 sizeof(*ip6), iclen - hlen);
662 } else
663 #endif
664 {
665 ip->ip_p = IPPROTO_ICMP;
666 ip->ip_src.s_addr = dst4.s_addr;
667 ip->ip_dst.s_addr = fin->fin_saddr;
668
669 if (xtra > 0)
670 bcopy((char *)fin->fin_ip + ohlen,
671 (char *)&icmp->icmp_ip + ohlen, xtra);
672 icmp->icmp_cksum = ipf_cksum((u_short *)icmp,
673 sizeof(*icmp) + 8);
674 ip->ip_len = htons(iclen);
675 ip->ip_p = IPPROTO_ICMP;
676 }
677 err = ipf_send_ip(fin, m);
678 return err;
679 }
680
681
682
683
684 /*
685 * m0 - pointer to mbuf where the IP packet starts
686 * mpp - pointer to the mbuf pointer that is the start of the mbuf chain
687 */
688 int
ipf_fastroute(m0,mpp,fin,fdp)689 ipf_fastroute(m0, mpp, fin, fdp)
690 mb_t *m0, **mpp;
691 fr_info_t *fin;
692 frdest_t *fdp;
693 {
694 register struct ip *ip, *mhip;
695 register struct mbuf *m = *mpp;
696 int len, off, error = 0, hlen, code;
697 struct ifnet *ifp, *sifp;
698 struct sockaddr_in dst;
699 struct nhop4_extended nh4;
700 u_long fibnum = 0;
701 u_short ip_off;
702 frdest_t node;
703 frentry_t *fr;
704
705 #ifdef M_WRITABLE
706 /*
707 * HOT FIX/KLUDGE:
708 *
709 * If the mbuf we're about to send is not writable (because of
710 * a cluster reference, for example) we'll need to make a copy
711 * of it since this routine modifies the contents.
712 *
713 * If you have non-crappy network hardware that can transmit data
714 * from the mbuf, rather than making a copy, this is gonna be a
715 * problem.
716 */
717 if (M_WRITABLE(m) == 0) {
718 m0 = m_dup(m, M_NOWAIT);
719 if (m0 != NULL) {
720 FREE_MB_T(m);
721 m = m0;
722 *mpp = m;
723 } else {
724 error = ENOBUFS;
725 FREE_MB_T(m);
726 goto done;
727 }
728 }
729 #endif
730
731 #ifdef USE_INET6
732 if (fin->fin_v == 6) {
733 /*
734 * currently "to <if>" and "to <if>:ip#" are not supported
735 * for IPv6
736 */
737 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
738 }
739 #endif
740
741 hlen = fin->fin_hlen;
742 ip = mtod(m0, struct ip *);
743 ifp = NULL;
744
745 /*
746 * Route packet.
747 */
748 bzero(&dst, sizeof (dst));
749 dst.sin_family = AF_INET;
750 dst.sin_addr = ip->ip_dst;
751 dst.sin_len = sizeof(dst);
752
753 fr = fin->fin_fr;
754 if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) &&
755 (fdp->fd_type == FRD_DSTLIST)) {
756 if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0)
757 fdp = &node;
758 }
759
760 if (fdp != NULL)
761 ifp = fdp->fd_ptr;
762 else
763 ifp = fin->fin_ifp;
764
765 if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) {
766 error = -2;
767 goto bad;
768 }
769
770 if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
771 dst.sin_addr = fdp->fd_ip;
772
773 fibnum = M_GETFIB(m0);
774 if (fib4_lookup_nh_ext(fibnum, dst.sin_addr, NHR_REF, 0, &nh4) != 0) {
775 if (in_localaddr(ip->ip_dst))
776 error = EHOSTUNREACH;
777 else
778 error = ENETUNREACH;
779 goto bad;
780 }
781
782 if (ifp == NULL)
783 ifp = nh4.nh_ifp;
784 if (nh4.nh_flags & NHF_GATEWAY)
785 dst.sin_addr = nh4.nh_addr;
786
787 /*
788 * For input packets which are being "fastrouted", they won't
789 * go back through output filtering and miss their chance to get
790 * NAT'd and counted. Duplicated packets aren't considered to be
791 * part of the normal packet stream, so do not NAT them or pass
792 * them through stateful checking, etc.
793 */
794 if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) {
795 sifp = fin->fin_ifp;
796 fin->fin_ifp = ifp;
797 fin->fin_out = 1;
798 (void) ipf_acctpkt(fin, NULL);
799 fin->fin_fr = NULL;
800 if (!fr || !(fr->fr_flags & FR_RETMASK)) {
801 u_32_t pass;
802
803 (void) ipf_state_check(fin, &pass);
804 }
805
806 switch (ipf_nat_checkout(fin, NULL))
807 {
808 case 0 :
809 break;
810 case 1 :
811 ip->ip_sum = 0;
812 break;
813 case -1 :
814 error = -1;
815 goto bad;
816 break;
817 }
818
819 fin->fin_ifp = sifp;
820 fin->fin_out = 0;
821 } else
822 ip->ip_sum = 0;
823 /*
824 * If small enough for interface, can just send directly.
825 */
826 if (ntohs(ip->ip_len) <= ifp->if_mtu) {
827 if (!ip->ip_sum)
828 ip->ip_sum = in_cksum(m, hlen);
829 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
830 NULL
831 );
832 goto done;
833 }
834 /*
835 * Too large for interface; fragment if possible.
836 * Must be able to put at least 8 bytes per fragment.
837 */
838 ip_off = ntohs(ip->ip_off);
839 if (ip_off & IP_DF) {
840 error = EMSGSIZE;
841 goto bad;
842 }
843 len = (ifp->if_mtu - hlen) &~ 7;
844 if (len < 8) {
845 error = EMSGSIZE;
846 goto bad;
847 }
848
849 {
850 int mhlen, firstlen = len;
851 struct mbuf **mnext = &m->m_act;
852
853 /*
854 * Loop through length of segment after first fragment,
855 * make new header and copy data of each part and link onto chain.
856 */
857 m0 = m;
858 mhlen = sizeof (struct ip);
859 for (off = hlen + len; off < ntohs(ip->ip_len); off += len) {
860 #ifdef MGETHDR
861 MGETHDR(m, M_NOWAIT, MT_HEADER);
862 #else
863 MGET(m, M_NOWAIT, MT_HEADER);
864 #endif
865 if (m == NULL) {
866 m = m0;
867 error = ENOBUFS;
868 goto bad;
869 }
870 m->m_data += max_linkhdr;
871 mhip = mtod(m, struct ip *);
872 bcopy((char *)ip, (char *)mhip, sizeof(*ip));
873 if (hlen > sizeof (struct ip)) {
874 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
875 IP_HL_A(mhip, mhlen >> 2);
876 }
877 m->m_len = mhlen;
878 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
879 if (off + len >= ntohs(ip->ip_len))
880 len = ntohs(ip->ip_len) - off;
881 else
882 mhip->ip_off |= IP_MF;
883 mhip->ip_len = htons((u_short)(len + mhlen));
884 *mnext = m;
885 m->m_next = m_copy(m0, off, len);
886 if (m->m_next == 0) {
887 error = ENOBUFS; /* ??? */
888 goto sendorfree;
889 }
890 m->m_pkthdr.len = mhlen + len;
891 m->m_pkthdr.rcvif = NULL;
892 mhip->ip_off = htons((u_short)mhip->ip_off);
893 mhip->ip_sum = 0;
894 mhip->ip_sum = in_cksum(m, mhlen);
895 mnext = &m->m_act;
896 }
897 /*
898 * Update first fragment by trimming what's been copied out
899 * and updating header, then send each fragment (in order).
900 */
901 m_adj(m0, hlen + firstlen - ip->ip_len);
902 ip->ip_len = htons((u_short)(hlen + firstlen));
903 ip->ip_off = htons((u_short)IP_MF);
904 ip->ip_sum = 0;
905 ip->ip_sum = in_cksum(m0, hlen);
906 sendorfree:
907 for (m = m0; m; m = m0) {
908 m0 = m->m_act;
909 m->m_act = 0;
910 if (error == 0)
911 error = (*ifp->if_output)(ifp, m,
912 (struct sockaddr *)&dst,
913 NULL
914 );
915 else
916 FREE_MB_T(m);
917 }
918 }
919 done:
920 if (!error)
921 V_ipfmain.ipf_frouteok[0]++;
922 else
923 V_ipfmain.ipf_frouteok[1]++;
924
925 return 0;
926 bad:
927 if (error == EMSGSIZE) {
928 sifp = fin->fin_ifp;
929 code = fin->fin_icode;
930 fin->fin_icode = ICMP_UNREACH_NEEDFRAG;
931 fin->fin_ifp = ifp;
932 (void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1);
933 fin->fin_ifp = sifp;
934 fin->fin_icode = code;
935 }
936 FREE_MB_T(m);
937 goto done;
938 }
939
940
941 int
ipf_verifysrc(fin)942 ipf_verifysrc(fin)
943 fr_info_t *fin;
944 {
945 struct nhop4_basic nh4;
946
947 if (fib4_lookup_nh_basic(0, fin->fin_src, 0, 0, &nh4) != 0)
948 return (0);
949 return (fin->fin_ifp == nh4.nh_ifp);
950 }
951
952
953 /*
954 * return the first IP Address associated with an interface
955 */
956 int
ipf_ifpaddr(softc,v,atype,ifptr,inp,inpmask)957 ipf_ifpaddr(softc, v, atype, ifptr, inp, inpmask)
958 ipf_main_softc_t *softc;
959 int v, atype;
960 void *ifptr;
961 i6addr_t *inp, *inpmask;
962 {
963 #ifdef USE_INET6
964 struct in6_addr *inp6 = NULL;
965 #endif
966 struct sockaddr *sock, *mask;
967 struct sockaddr_in *sin;
968 struct ifaddr *ifa;
969 struct ifnet *ifp;
970
971 if ((ifptr == NULL) || (ifptr == (void *)-1))
972 return -1;
973
974 sin = NULL;
975 ifp = ifptr;
976
977 if (v == 4)
978 inp->in4.s_addr = 0;
979 #ifdef USE_INET6
980 else if (v == 6)
981 bzero((char *)inp, sizeof(*inp));
982 #endif
983 ifa = TAILQ_FIRST(&ifp->if_addrhead);
984
985 sock = ifa->ifa_addr;
986 while (sock != NULL && ifa != NULL) {
987 sin = (struct sockaddr_in *)sock;
988 if ((v == 4) && (sin->sin_family == AF_INET))
989 break;
990 #ifdef USE_INET6
991 if ((v == 6) && (sin->sin_family == AF_INET6)) {
992 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
993 if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
994 !IN6_IS_ADDR_LOOPBACK(inp6))
995 break;
996 }
997 #endif
998 ifa = TAILQ_NEXT(ifa, ifa_link);
999 if (ifa != NULL)
1000 sock = ifa->ifa_addr;
1001 }
1002
1003 if (ifa == NULL || sin == NULL)
1004 return -1;
1005
1006 mask = ifa->ifa_netmask;
1007 if (atype == FRI_BROADCAST)
1008 sock = ifa->ifa_broadaddr;
1009 else if (atype == FRI_PEERADDR)
1010 sock = ifa->ifa_dstaddr;
1011
1012 if (sock == NULL)
1013 return -1;
1014
1015 #ifdef USE_INET6
1016 if (v == 6) {
1017 return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock,
1018 (struct sockaddr_in6 *)mask,
1019 inp, inpmask);
1020 }
1021 #endif
1022 return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock,
1023 (struct sockaddr_in *)mask,
1024 &inp->in4, &inpmask->in4);
1025 }
1026
1027
1028 u_32_t
ipf_newisn(fin)1029 ipf_newisn(fin)
1030 fr_info_t *fin;
1031 {
1032 u_32_t newiss;
1033 newiss = arc4random();
1034 return newiss;
1035 }
1036
1037
1038 INLINE int
ipf_checkv4sum(fin)1039 ipf_checkv4sum(fin)
1040 fr_info_t *fin;
1041 {
1042 #ifdef CSUM_DATA_VALID
1043 int manual = 0;
1044 u_short sum;
1045 ip_t *ip;
1046 mb_t *m;
1047
1048 if ((fin->fin_flx & FI_NOCKSUM) != 0)
1049 return 0;
1050
1051 if ((fin->fin_flx & FI_SHORT) != 0)
1052 return 1;
1053
1054 if (fin->fin_cksum != FI_CK_NEEDED)
1055 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
1056
1057 m = fin->fin_m;
1058 if (m == NULL) {
1059 manual = 1;
1060 goto skipauto;
1061 }
1062 ip = fin->fin_ip;
1063
1064 if ((m->m_pkthdr.csum_flags & (CSUM_IP_CHECKED|CSUM_IP_VALID)) ==
1065 CSUM_IP_CHECKED) {
1066 fin->fin_cksum = FI_CK_BAD;
1067 fin->fin_flx |= FI_BAD;
1068 DT2(ipf_fi_bad_checkv4sum_csum_ip_checked, fr_info_t *, fin, u_int, m->m_pkthdr.csum_flags & (CSUM_IP_CHECKED|CSUM_IP_VALID));
1069 return -1;
1070 }
1071 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
1072 /* Depending on the driver, UDP may have zero checksum */
1073 if (fin->fin_p == IPPROTO_UDP && (fin->fin_flx &
1074 (FI_FRAG|FI_SHORT|FI_BAD)) == 0) {
1075 udphdr_t *udp = fin->fin_dp;
1076 if (udp->uh_sum == 0) {
1077 /*
1078 * we're good no matter what the hardware
1079 * checksum flags and csum_data say (handling
1080 * of csum_data for zero UDP checksum is not
1081 * consistent across all drivers)
1082 */
1083 fin->fin_cksum = 1;
1084 return 0;
1085 }
1086 }
1087
1088 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
1089 sum = m->m_pkthdr.csum_data;
1090 else
1091 sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
1092 htonl(m->m_pkthdr.csum_data +
1093 fin->fin_dlen + fin->fin_p));
1094 sum ^= 0xffff;
1095 if (sum != 0) {
1096 fin->fin_cksum = FI_CK_BAD;
1097 fin->fin_flx |= FI_BAD;
1098 DT2(ipf_fi_bad_checkv4sum_sum, fr_info_t *, fin, u_int, sum);
1099 } else {
1100 fin->fin_cksum = FI_CK_SUMOK;
1101 return 0;
1102 }
1103 } else {
1104 if (m->m_pkthdr.csum_flags == CSUM_DELAY_DATA) {
1105 fin->fin_cksum = FI_CK_L4FULL;
1106 return 0;
1107 } else if (m->m_pkthdr.csum_flags == CSUM_TCP ||
1108 m->m_pkthdr.csum_flags == CSUM_UDP) {
1109 fin->fin_cksum = FI_CK_L4PART;
1110 return 0;
1111 } else if (m->m_pkthdr.csum_flags == CSUM_IP) {
1112 fin->fin_cksum = FI_CK_L4PART;
1113 return 0;
1114 } else {
1115 manual = 1;
1116 }
1117 }
1118 skipauto:
1119 if (manual != 0) {
1120 if (ipf_checkl4sum(fin) == -1) {
1121 fin->fin_flx |= FI_BAD;
1122 DT2(ipf_fi_bad_checkv4sum_manual, fr_info_t *, fin, u_int, manual);
1123 return -1;
1124 }
1125 }
1126 #else
1127 if (ipf_checkl4sum(fin) == -1) {
1128 fin->fin_flx |= FI_BAD;
1129 DT2(ipf_fi_bad_checkv4sum_checkl4sum, fr_info_t *, fin, u_int, -1);
1130 return -1;
1131 }
1132 #endif
1133 return 0;
1134 }
1135
1136
1137 #ifdef USE_INET6
1138 INLINE int
ipf_checkv6sum(fin)1139 ipf_checkv6sum(fin)
1140 fr_info_t *fin;
1141 {
1142 if ((fin->fin_flx & FI_NOCKSUM) != 0) {
1143 DT(ipf_checkv6sum_fi_nocksum);
1144 return 0;
1145 }
1146
1147 if ((fin->fin_flx & FI_SHORT) != 0) {
1148 DT(ipf_checkv6sum_fi_short);
1149 return 1;
1150 }
1151
1152 if (fin->fin_cksum != FI_CK_NEEDED) {
1153 DT(ipf_checkv6sum_fi_ck_needed);
1154 return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
1155 }
1156
1157 if (ipf_checkl4sum(fin) == -1) {
1158 fin->fin_flx |= FI_BAD;
1159 DT2(ipf_fi_bad_checkv6sum_checkl4sum, fr_info_t *, fin, u_int, -1);
1160 return -1;
1161 }
1162 return 0;
1163 }
1164 #endif /* USE_INET6 */
1165
1166
1167 size_t
mbufchainlen(m0)1168 mbufchainlen(m0)
1169 struct mbuf *m0;
1170 {
1171 size_t len;
1172
1173 if ((m0->m_flags & M_PKTHDR) != 0) {
1174 len = m0->m_pkthdr.len;
1175 } else {
1176 struct mbuf *m;
1177
1178 for (m = m0, len = 0; m != NULL; m = m->m_next)
1179 len += m->m_len;
1180 }
1181 return len;
1182 }
1183
1184
1185 /* ------------------------------------------------------------------------ */
1186 /* Function: ipf_pullup */
1187 /* Returns: NULL == pullup failed, else pointer to protocol header */
1188 /* Parameters: xmin(I)- pointer to buffer where data packet starts */
1189 /* fin(I) - pointer to packet information */
1190 /* len(I) - number of bytes to pullup */
1191 /* */
1192 /* Attempt to move at least len bytes (from the start of the buffer) into a */
1193 /* single buffer for ease of access. Operating system native functions are */
1194 /* used to manage buffers - if necessary. If the entire packet ends up in */
1195 /* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */
1196 /* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */
1197 /* and ONLY if the pullup succeeds. */
1198 /* */
1199 /* We assume that 'xmin' is a pointer to a buffer that is part of the chain */
1200 /* of buffers that starts at *fin->fin_mp. */
1201 /* ------------------------------------------------------------------------ */
1202 void *
ipf_pullup(xmin,fin,len)1203 ipf_pullup(xmin, fin, len)
1204 mb_t *xmin;
1205 fr_info_t *fin;
1206 int len;
1207 {
1208 int dpoff, ipoff;
1209 mb_t *m = xmin;
1210 char *ip;
1211
1212 if (m == NULL)
1213 return NULL;
1214
1215 ip = (char *)fin->fin_ip;
1216 if ((fin->fin_flx & FI_COALESCE) != 0)
1217 return ip;
1218
1219 ipoff = fin->fin_ipoff;
1220 if (fin->fin_dp != NULL)
1221 dpoff = (char *)fin->fin_dp - (char *)ip;
1222 else
1223 dpoff = 0;
1224
1225 if (M_LEN(m) < len) {
1226 mb_t *n = *fin->fin_mp;
1227 /*
1228 * Assume that M_PKTHDR is set and just work with what is left
1229 * rather than check..
1230 * Should not make any real difference, anyway.
1231 */
1232 if (m != n) {
1233 /*
1234 * Record the mbuf that points to the mbuf that we're
1235 * about to go to work on so that we can update the
1236 * m_next appropriately later.
1237 */
1238 for (; n->m_next != m; n = n->m_next)
1239 ;
1240 } else {
1241 n = NULL;
1242 }
1243
1244 #ifdef MHLEN
1245 if (len > MHLEN)
1246 #else
1247 if (len > MLEN)
1248 #endif
1249 {
1250 #ifdef HAVE_M_PULLDOWN
1251 if (m_pulldown(m, 0, len, NULL) == NULL)
1252 m = NULL;
1253 #else
1254 FREE_MB_T(*fin->fin_mp);
1255 m = NULL;
1256 n = NULL;
1257 #endif
1258 } else
1259 {
1260 m = m_pullup(m, len);
1261 }
1262 if (n != NULL)
1263 n->m_next = m;
1264 if (m == NULL) {
1265 /*
1266 * When n is non-NULL, it indicates that m pointed to
1267 * a sub-chain (tail) of the mbuf and that the head
1268 * of this chain has not yet been free'd.
1269 */
1270 if (n != NULL) {
1271 FREE_MB_T(*fin->fin_mp);
1272 }
1273
1274 *fin->fin_mp = NULL;
1275 fin->fin_m = NULL;
1276 return NULL;
1277 }
1278
1279 if (n == NULL)
1280 *fin->fin_mp = m;
1281
1282 while (M_LEN(m) == 0) {
1283 m = m->m_next;
1284 }
1285 fin->fin_m = m;
1286 ip = MTOD(m, char *) + ipoff;
1287
1288 fin->fin_ip = (ip_t *)ip;
1289 if (fin->fin_dp != NULL)
1290 fin->fin_dp = (char *)fin->fin_ip + dpoff;
1291 if (fin->fin_fraghdr != NULL)
1292 fin->fin_fraghdr = (char *)ip +
1293 ((char *)fin->fin_fraghdr -
1294 (char *)fin->fin_ip);
1295 }
1296
1297 if (len == fin->fin_plen)
1298 fin->fin_flx |= FI_COALESCE;
1299 return ip;
1300 }
1301
1302
1303 int
ipf_inject(fin,m)1304 ipf_inject(fin, m)
1305 fr_info_t *fin;
1306 mb_t *m;
1307 {
1308 int error = 0;
1309
1310 if (fin->fin_out == 0) {
1311 netisr_dispatch(NETISR_IP, m);
1312 } else {
1313 fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len);
1314 fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off);
1315 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
1316 }
1317
1318 return error;
1319 }
1320
ipf_pfil_unhook(void)1321 int ipf_pfil_unhook(void) {
1322 struct pfil_head *ph_inet;
1323 #ifdef USE_INET6
1324 struct pfil_head *ph_inet6;
1325 #endif
1326
1327 ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
1328 if (ph_inet != NULL)
1329 pfil_remove_hook((void *)ipf_check_wrapper, NULL,
1330 PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet);
1331 # ifdef USE_INET6
1332 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
1333 if (ph_inet6 != NULL)
1334 pfil_remove_hook((void *)ipf_check_wrapper6, NULL,
1335 PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6);
1336 # endif
1337
1338 return (0);
1339 }
1340
ipf_pfil_hook(void)1341 int ipf_pfil_hook(void) {
1342 struct pfil_head *ph_inet;
1343 #ifdef USE_INET6
1344 struct pfil_head *ph_inet6;
1345 #endif
1346
1347 ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
1348 # ifdef USE_INET6
1349 ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
1350 # endif
1351 if (ph_inet == NULL
1352 # ifdef USE_INET6
1353 && ph_inet6 == NULL
1354 # endif
1355 ) {
1356 return ENODEV;
1357 }
1358
1359 if (ph_inet != NULL)
1360 pfil_add_hook((void *)ipf_check_wrapper, NULL,
1361 PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet);
1362 # ifdef USE_INET6
1363 if (ph_inet6 != NULL)
1364 pfil_add_hook((void *)ipf_check_wrapper6, NULL,
1365 PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6);
1366 # endif
1367 return (0);
1368 }
1369
1370 void
ipf_event_reg(void)1371 ipf_event_reg(void)
1372 {
1373 ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \
1374 ipf_ifevent, NULL, \
1375 EVENTHANDLER_PRI_ANY);
1376 ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \
1377 ipf_ifevent, NULL, \
1378 EVENTHANDLER_PRI_ANY);
1379 #if 0
1380 ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \
1381 NULL, EVENTHANDLER_PRI_ANY);
1382 #endif
1383 }
1384
1385 void
ipf_event_dereg(void)1386 ipf_event_dereg(void)
1387 {
1388 if (ipf_arrivetag != NULL) {
1389 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag);
1390 }
1391 if (ipf_departtag != NULL) {
1392 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag);
1393 }
1394 #if 0
1395 if (ipf_clonetag != NULL) {
1396 EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag);
1397 }
1398 #endif
1399 }
1400
1401
1402 u_32_t
ipf_random()1403 ipf_random()
1404 {
1405 return arc4random();
1406 }
1407
1408
1409 u_int
ipf_pcksum(fin,hlen,sum)1410 ipf_pcksum(fin, hlen, sum)
1411 fr_info_t *fin;
1412 int hlen;
1413 u_int sum;
1414 {
1415 struct mbuf *m;
1416 u_int sum2;
1417 int off;
1418
1419 m = fin->fin_m;
1420 off = (char *)fin->fin_dp - (char *)fin->fin_ip;
1421 m->m_data += hlen;
1422 m->m_len -= hlen;
1423 sum2 = in_cksum(fin->fin_m, fin->fin_plen - off);
1424 m->m_len += hlen;
1425 m->m_data -= hlen;
1426
1427 /*
1428 * Both sum and sum2 are partial sums, so combine them together.
1429 */
1430 sum += ~sum2 & 0xffff;
1431 while (sum > 0xffff)
1432 sum = (sum & 0xffff) + (sum >> 16);
1433 sum2 = ~sum & 0xffff;
1434 return sum2;
1435 }
1436
1437 #ifdef USE_INET6
1438 u_int
ipf_pcksum6(m,ip6,off,len)1439 ipf_pcksum6(m, ip6, off, len)
1440 struct mbuf *m;
1441 ip6_t *ip6;
1442 u_int32_t off;
1443 u_int32_t len;
1444 {
1445 #ifdef _KERNEL
1446 int sum;
1447
1448 if (m->m_len < sizeof(struct ip6_hdr)) {
1449 return 0xffff;
1450 }
1451
1452 sum = in6_cksum(m, ip6->ip6_nxt, off, len);
1453 return(sum);
1454 #else
1455 u_short *sp;
1456 u_int sum;
1457
1458 sp = (u_short *)&ip6->ip6_src;
1459 sum = *sp++; /* ip6_src */
1460 sum += *sp++;
1461 sum += *sp++;
1462 sum += *sp++;
1463 sum += *sp++;
1464 sum += *sp++;
1465 sum += *sp++;
1466 sum += *sp++;
1467 sum += *sp++; /* ip6_dst */
1468 sum += *sp++;
1469 sum += *sp++;
1470 sum += *sp++;
1471 sum += *sp++;
1472 sum += *sp++;
1473 sum += *sp++;
1474 sum += *sp++;
1475 return(ipf_pcksum(fin, off, sum));
1476 #endif
1477 }
1478 #endif
1479