Annotation of src/sys/netinet6/ip6_input.c, Revision 1.19
1.19 ! thorpej 1: /* $NetBSD: ip6_input.c,v 1.18 2000/03/21 23:53:30 itojun Exp $ */
1.17 itojun 2: /* $KAME: ip6_input.c,v 1.72 2000/03/21 09:23:19 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1988, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. All advertising materials mentioning features or use of this software
46: * must display the following acknowledgement:
47: * This product includes software developed by the University of
48: * California, Berkeley and its contributors.
49: * 4. Neither the name of the University nor the names of its contributors
50: * may be used to endorse or promote products derived from this software
51: * without specific prior written permission.
52: *
53: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: * SUCH DAMAGE.
64: *
65: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
66: */
67:
68: #include "opt_inet.h"
1.4 thorpej 69: #include "opt_ipsec.h"
1.15 darrenr 70: #include "opt_pfil_hooks.h"
1.2 itojun 71:
72: #include <sys/param.h>
73: #include <sys/systm.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/domain.h>
77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
80: #include <sys/errno.h>
81: #include <sys/time.h>
82: #include <sys/kernel.h>
83: #include <sys/syslog.h>
84: #include <sys/proc.h>
85:
86: #include <net/if.h>
87: #include <net/if_types.h>
88: #include <net/if_dl.h>
89: #include <net/route.h>
90: #include <net/netisr.h>
1.15 darrenr 91: #ifdef PFIL_HOOKS
92: #include <net/pfil.h>
93: #endif
1.2 itojun 94:
95: #include <netinet/in.h>
1.9 itojun 96: #include <netinet/in_systm.h>
97: #ifdef INET
98: #include <netinet/ip.h>
99: #include <netinet/ip_icmp.h>
100: #endif /*INET*/
1.14 itojun 101: #include <netinet/ip6.h>
1.2 itojun 102: #include <netinet6/in6_var.h>
1.11 itojun 103: #include <netinet6/ip6_var.h>
1.2 itojun 104: #include <netinet6/in6_pcb.h>
1.14 itojun 105: #include <netinet/icmp6.h>
1.2 itojun 106: #include <netinet6/in6_ifattach.h>
107: #include <netinet6/nd6.h>
1.9 itojun 108: #include <netinet6/in6_prefix.h>
1.2 itojun 109:
1.9 itojun 110: #ifdef IPV6FIREWALL
111: #include <netinet6/ip6_fw.h>
112: #endif
1.2 itojun 113:
114: #include <netinet6/ip6protosw.h>
115:
116: /* we need it for NLOOP. */
117: #include "loop.h"
118: #include "faith.h"
119:
120: #include "gif.h"
121: #include "bpfilter.h"
122:
1.9 itojun 123: #include <net/net_osdep.h>
124:
1.2 itojun 125: extern struct domain inet6domain;
126:
127: u_char ip6_protox[IPPROTO_MAX];
128: static int ip6qmaxlen = IFQ_MAXLEN;
129: struct in6_ifaddr *in6_ifaddr;
130: struct ifqueue ip6intrq;
131:
132: extern struct ifnet loif[NLOOP];
133: int ip6_forward_srcrt; /* XXX */
134: int ip6_sourcecheck; /* XXX */
135: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 136:
137: #ifdef IPV6FIREWALL
138: /* firewall hooks */
139: ip6_fw_chk_t *ip6_fw_chk_ptr;
140: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2 itojun 141: #endif
142:
143: struct ip6stat ip6stat;
144:
145: static void ip6_init2 __P((void *));
146:
1.5 itojun 147: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 148:
1.12 itojun 149: #ifdef PTR
1.9 itojun 150: extern int ip6_protocol_tr;
151:
152: int ptr_in6 __P((struct mbuf *, struct mbuf **));
153: extern void ip_forward __P((struct mbuf *, int));
154: #endif
155:
1.2 itojun 156: /*
157: * IP6 initialization: fill in IP6 protocol switch table.
158: * All protocols not implemented in kernel go to raw IP6 protocol handler.
159: */
160: void
161: ip6_init()
162: {
163: register struct ip6protosw *pr;
164: register int i;
165: struct timeval tv;
166:
167: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
168: if (pr == 0)
169: panic("ip6_init");
170: for (i = 0; i < IPPROTO_MAX; i++)
171: ip6_protox[i] = pr - inet6sw;
172: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
173: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
174: if (pr->pr_domain->dom_family == PF_INET6 &&
175: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
176: ip6_protox[pr->pr_protocol] = pr - inet6sw;
177: ip6intrq.ifq_maxlen = ip6qmaxlen;
178: nd6_init();
179: frag6_init();
1.9 itojun 180: #ifdef IPV6FIREWALL
181: ip6_fw_init();
182: #endif
1.2 itojun 183: /*
184: * in many cases, random() here does NOT return random number
185: * as initialization during bootstrap time occur in fixed order.
186: */
187: microtime(&tv);
188: ip6_flow_seq = random() ^ tv.tv_usec;
189:
190: ip6_init2((void *)0);
191: }
192:
193: static void
194: ip6_init2(dummy)
195: void *dummy;
196: {
1.9 itojun 197: int ret;
198:
199: /* get EUI64 from somewhere */
200: ret = in6_ifattach_getifid(NULL);
1.2 itojun 201:
202: /*
203: * to route local address of p2p link to loopback,
204: * assign loopback address first.
205: */
1.9 itojun 206: in6_ifattach(&loif[0], IN6_IFT_LOOP, NULL, 0);
1.2 itojun 207:
208: /* nd6_timer_init */
1.19 ! thorpej 209: callout_init(&nd6_timer_ch);
! 210: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 211: /* router renumbering prefix list maintenance */
1.19 ! thorpej 212: callout_init(&in6_rr_timer_ch);
! 213: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 214: }
215:
216: /*
217: * IP6 input interrupt handling. Just pass the packet to ip6_input.
218: */
219: void
220: ip6intr()
221: {
222: int s;
223: struct mbuf *m;
224:
225: for (;;) {
226: s = splimp();
227: IF_DEQUEUE(&ip6intrq, m);
228: splx(s);
229: if (m == 0)
230: return;
231: ip6_input(m);
232: }
233: }
234:
235: extern struct route_in6 ip6_forward_rt;
236:
237: void
238: ip6_input(m)
239: struct mbuf *m;
240: {
1.9 itojun 241: struct ip6_hdr *ip6;
1.2 itojun 242: int off = sizeof(struct ip6_hdr), nest;
243: u_int32_t plen;
1.5 itojun 244: u_int32_t rtalert = ~0;
1.2 itojun 245: int nxt, ours = 0;
1.9 itojun 246: struct ifnet *deliverifp = NULL;
1.15 darrenr 247: #ifdef PFIL_HOOKS
248: struct packet_filter_hook *pfh;
249: struct mbuf *m0;
250: int rv;
251: #endif /* PFIL_HOOKS */
1.2 itojun 252:
253: #ifdef IPSEC
254: /*
255: * should the inner packet be considered authentic?
256: * see comment in ah4_input().
257: */
258: if (m) {
259: m->m_flags &= ~M_AUTHIPHDR;
260: m->m_flags &= ~M_AUTHIPDGM;
261: }
262: #endif
1.9 itojun 263:
1.2 itojun 264: /*
265: * mbuf statistics by kazu
266: */
267: if (m->m_flags & M_EXT) {
268: if (m->m_next)
269: ip6stat.ip6s_mext2m++;
270: else
271: ip6stat.ip6s_mext1++;
272: } else {
273: if (m->m_next) {
1.9 itojun 274: if (m->m_flags & M_LOOP) {
1.2 itojun 275: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.9 itojun 276: }
1.2 itojun 277: else if (m->m_pkthdr.rcvif->if_index <= 31)
278: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
279: else
280: ip6stat.ip6s_m2m[0]++;
281: } else
282: ip6stat.ip6s_m1++;
283: }
284:
1.9 itojun 285: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
286: ip6stat.ip6s_total++;
287:
288: #ifndef PULLDOWN_TEST
289: /* XXX is the line really necessary? */
1.2 itojun 290: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 291: #endif
1.2 itojun 292:
1.9 itojun 293: if (m->m_len < sizeof(struct ip6_hdr)) {
294: struct ifnet *inifp;
295: inifp = m->m_pkthdr.rcvif;
296: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
297: ip6stat.ip6s_toosmall++;
298: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
299: return;
300: }
1.2 itojun 301: }
302:
303: ip6 = mtod(m, struct ip6_hdr *);
304:
305: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
306: ip6stat.ip6s_badvers++;
1.9 itojun 307: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 308: goto bad;
309: }
1.15 darrenr 310:
311: #ifdef PFIL_HOOKS
312: /*
313: * Run through list of hooks for input packets. If there are any
314: * filters which require that additional packets in the flow are
315: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
316: * Note that filters must _never_ set this flag, as another filter
317: * in the list may have previously cleared it.
318: */
319: m0 = m;
1.16 darrenr 320: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15 darrenr 321: for (; pfh; pfh = pfh->pfil_link.tqe_next)
322: if (pfh->pfil_func) {
323: rv = pfh->pfil_func(ip6, sizeof(*ip6),
324: m->m_pkthdr.rcvif, 0, &m0);
325: if (rv)
326: return;
327: m = m0;
328: if (m == NULL)
329: return;
330: ip6 = mtod(m, struct ip6_hdr *);
331: }
332: #endif /* PFIL_HOOKS */
333:
1.2 itojun 334:
335: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
336:
1.9 itojun 337: #ifdef IPV6FIREWALL
338: /*
339: * Check with the firewall...
340: */
341: if (ip6_fw_chk_ptr) {
342: u_short port = 0;
343: /* If ipfw says divert, we have to just drop packet */
344: /* use port as a dummy argument */
345: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
346: m_freem(m);
347: m = NULL;
348: }
349: if (!m)
350: return;
351: }
352: #endif
353:
1.2 itojun 354: /*
355: * Scope check
356: */
357: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
358: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
359: ip6stat.ip6s_badscope++;
1.9 itojun 360: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 361: goto bad;
362: }
1.13 itojun 363: /*
364: * The following check is not documented in the spec. Malicious party
365: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
366: * bypass security checks (act as if it was from 127.0.0.1 by using
367: * IPv6 src ::ffff:127.0.0.1). Be cautious.
368: */
369: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
370: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
371: ip6stat.ip6s_badscope++;
372: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
373: goto bad;
374: }
1.17 itojun 375: #if 0
1.13 itojun 376: /*
1.17 itojun 377: * Reject packets with IPv4 compatible addresses (auto tunnel).
378: *
379: * The code forbids auto tunnel relay case in RFC1933 (the check is
380: * stronger than RFC1933). We may want to re-enable it if mech-xx
381: * is revised to forbid relaying case.
1.13 itojun 382: */
383: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
384: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
385: ip6stat.ip6s_badscope++;
386: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
387: goto bad;
388: }
389: #endif
1.2 itojun 390: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
391: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
392: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
393: ours = 1;
1.9 itojun 394: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 395: goto hbhcheck;
396: } else {
397: ip6stat.ip6s_badscope++;
1.9 itojun 398: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 399: goto bad;
400: }
401: }
402:
403: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
404: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
405: ours = 1;
1.9 itojun 406: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 407: goto hbhcheck;
408: }
409: } else {
410: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
411: ip6->ip6_src.s6_addr16[1]
412: = htons(m->m_pkthdr.rcvif->if_index);
413: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
414: ip6->ip6_dst.s6_addr16[1]
415: = htons(m->m_pkthdr.rcvif->if_index);
416: }
417:
1.12 itojun 418: #ifdef PTR
1.9 itojun 419: /*
420: *
421: */
422: if (ip6_protocol_tr)
423: {
424: struct mbuf *m1 = NULL;
425:
426: switch (ptr_in6(m, &m1))
427: {
428: case IPPROTO_IP: goto mcastcheck;
429: case IPPROTO_IPV4: ip_forward(m1, 0); break;
430: case IPPROTO_IPV6: ip6_forward(m1, 0); break;
431: case IPPROTO_MAX: /* discard this packet */
432: default:
433: }
434:
435: if (m != m1)
436: m_freem(m);
437:
438: return;
439: }
440:
441: mcastcheck:
442: #endif
443:
1.2 itojun 444: /*
445: * Multicast check
446: */
447: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
448: struct in6_multi *in6m = 0;
1.9 itojun 449:
450: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 451: /*
452: * See if we belong to the destination multicast group on the
453: * arrival interface.
454: */
455: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
456: if (in6m)
457: ours = 1;
458: else if (!ip6_mrouter) {
459: ip6stat.ip6s_notmember++;
460: ip6stat.ip6s_cantforward++;
1.9 itojun 461: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 462: goto bad;
463: }
1.9 itojun 464: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 465: goto hbhcheck;
466: }
467:
468: /*
469: * Unicast check
470: */
471: if (ip6_forward_rt.ro_rt == 0 ||
472: !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
473: &ip6_forward_rt.ro_dst.sin6_addr)) {
474: if (ip6_forward_rt.ro_rt) {
475: RTFREE(ip6_forward_rt.ro_rt);
476: ip6_forward_rt.ro_rt = 0;
477: }
478: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
479: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
480: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
481: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
482:
1.9 itojun 483: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 484: }
485:
486: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
487:
488: /*
489: * Accept the packet if the forwarding interface to the destination
490: * according to the routing table is the loopback interface,
491: * unless the associated route has a gateway.
492: * Note that this approach causes to accept a packet if there is a
493: * route to the loopback interface for the destination of the packet.
494: * But we think it's even useful in some situations, e.g. when using
495: * a special daemon which wants to intercept the packet.
496: */
497: if (ip6_forward_rt.ro_rt &&
498: (ip6_forward_rt.ro_rt->rt_flags &
499: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
500: #if 0
501: /*
502: * The check below is redundant since the comparison of
503: * the destination and the key of the rtentry has
504: * already done through looking up the routing table.
505: */
506: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
507: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
508: #endif
1.9 itojun 509: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 510: struct in6_ifaddr *ia6 =
511: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
512: /* packet to tentative address must not be received */
513: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
514: m->m_flags |= M_ANYCAST6;
515: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
516: /* this interface is ready */
517: ours = 1;
1.9 itojun 518: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 519: goto hbhcheck;
520: } else {
521: /* this interface is not ready, fall through */
522: }
523: }
524:
525: /*
526: * FAITH(Firewall Aided Internet Translator)
527: */
528: #if defined(NFAITH) && 0 < NFAITH
529: if (ip6_keepfaith) {
530: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
531: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
532: /* XXX do we need more sanity checks? */
533: ours = 1;
1.9 itojun 534: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
535: goto hbhcheck;
536: }
537: }
538: #endif
539:
540: #if 0
541: {
542: /*
543: * Last resort: check in6_ifaddr for incoming interface.
544: * The code is here until I update the "goto ours hack" code above
545: * working right.
546: */
547: struct ifaddr *ifa;
548: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
549: ifa;
550: ifa = ifa->ifa_list.tqe_next) {
551: if (ifa->ifa_addr == NULL)
552: continue; /* just for safety */
553: if (ifa->ifa_addr->sa_family != AF_INET6)
554: continue;
555: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
556: ours = 1;
557: deliverifp = ifa->ifa_ifp;
1.2 itojun 558: goto hbhcheck;
559: }
560: }
1.9 itojun 561: }
1.2 itojun 562: #endif
563:
564: /*
565: * Now there is no reason to process the packet if it's not our own
566: * and we're not a router.
567: */
568: if (!ip6_forwarding) {
569: ip6stat.ip6s_cantforward++;
1.9 itojun 570: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 571: goto bad;
572: }
573:
574: hbhcheck:
575: /*
576: * Process Hop-by-Hop options header if it's contained.
577: * m may be modified in ip6_hopopts_input().
578: * If a JumboPayload option is included, plen will also be modified.
579: */
580: plen = (u_int32_t)ntohs(ip6->ip6_plen);
581: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 582: struct ip6_hbh *hbh;
583:
584: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
585: #if 0 /*touches NULL pointer*/
586: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
587: #endif
1.2 itojun 588: return; /* m have already been freed */
1.9 itojun 589: }
1.2 itojun 590: /* adjust pointer */
591: ip6 = mtod(m, struct ip6_hdr *);
1.9 itojun 592: #ifndef PULLDOWN_TEST
593: /* ip6_hopopts_input() ensures that mbuf is contiguous */
594: hbh = (struct ip6_hbh *)(ip6 + 1);
595: #else
596: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
597: sizeof(struct ip6_hbh));
598: if (hbh == NULL) {
599: ip6stat.ip6s_tooshort++;
600: return;
601: }
602: #endif
603: nxt = hbh->ip6h_nxt;
1.2 itojun 604:
605: /*
606: * accept the packet if a router alert option is included
607: * and we act as an IPv6 router.
608: */
1.5 itojun 609: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 610: ours = 1;
611: } else
612: nxt = ip6->ip6_nxt;
613:
614: /*
615: * Check that the amount of data in the buffers
616: * is as at least much as the IPv6 header would have us expect.
617: * Trim mbufs if longer than we expect.
618: * Drop packet if shorter than we expect.
619: */
620: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
621: ip6stat.ip6s_tooshort++;
1.9 itojun 622: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 623: goto bad;
624: }
625: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
626: if (m->m_len == m->m_pkthdr.len) {
627: m->m_len = sizeof(struct ip6_hdr) + plen;
628: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
629: } else
630: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
631: }
632:
633: /*
634: * Forward if desirable.
635: */
636: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
637: /*
638: * If we are acting as a multicast router, all
639: * incoming multicast packets are passed to the
640: * kernel-level multicast forwarding function.
641: * The packet is returned (relatively) intact; if
642: * ip6_mforward() returns a non-zero value, the packet
643: * must be discarded, else it may be accepted below.
644: */
645: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
646: ip6stat.ip6s_cantforward++;
647: m_freem(m);
648: return;
649: }
650: if (!ours) {
651: m_freem(m);
652: return;
653: }
654: }
655: else if (!ours) {
656: ip6_forward(m, 0);
657: return;
658: }
659:
660: /*
661: * Tell launch routine the next header
662: */
1.12 itojun 663: #ifdef IFA_STATS
1.9 itojun 664: if (IFA_STATS && deliverifp != NULL) {
665: struct in6_ifaddr *ia6;
666: ip6 = mtod(m, struct ip6_hdr *);
667: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
668: if (ia6)
669: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
670: }
671: #endif
1.2 itojun 672: ip6stat.ip6s_delivered++;
1.9 itojun 673: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 674: nest = 0;
675: while (nxt != IPPROTO_DONE) {
676: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
677: ip6stat.ip6s_toomanyhdr++;
678: goto bad;
679: }
1.8 itojun 680:
681: /*
682: * protection against faulty packet - there should be
683: * more sanity checks in header chain processing.
684: */
685: if (m->m_pkthdr.len < off) {
686: ip6stat.ip6s_tooshort++;
1.9 itojun 687: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 688: goto bad;
689: }
690:
1.2 itojun 691: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
692: }
693: return;
694: bad:
695: m_freem(m);
696: }
697:
698: /*
699: * Hop-by-Hop options header processing. If a valid jumbo payload option is
700: * included, the real payload length will be stored in plenp.
701: */
702: static int
703: ip6_hopopts_input(plenp, rtalertp, mp, offp)
704: u_int32_t *plenp;
1.5 itojun 705: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 706: struct mbuf **mp;
707: int *offp;
708: {
709: register struct mbuf *m = *mp;
710: int off = *offp, hbhlen;
711: struct ip6_hbh *hbh;
712: u_int8_t *opt;
713:
714: /* validation of the length of the header */
1.9 itojun 715: #ifndef PULLDOWN_TEST
1.2 itojun 716: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
717: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
718: hbhlen = (hbh->ip6h_len + 1) << 3;
719:
720: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
721: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 722: #else
723: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
724: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
725: if (hbh == NULL) {
726: ip6stat.ip6s_tooshort++;
727: return -1;
728: }
729: hbhlen = (hbh->ip6h_len + 1) << 3;
730: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
731: hbhlen);
732: if (hbh == NULL) {
733: ip6stat.ip6s_tooshort++;
734: return -1;
735: }
736: #endif
1.2 itojun 737: off += hbhlen;
738: hbhlen -= sizeof(struct ip6_hbh);
739: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
740:
741: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
742: hbhlen, rtalertp, plenp) < 0)
743: return(-1);
744:
745: *offp = off;
746: *mp = m;
747: return(0);
748: }
749:
750: /*
751: * Search header for all Hop-by-hop options and process each option.
752: * This function is separate from ip6_hopopts_input() in order to
753: * handle a case where the sending node itself process its hop-by-hop
754: * options header. In such a case, the function is called from ip6_output().
755: */
756: int
757: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
758: struct mbuf *m;
759: u_int8_t *opthead;
760: int hbhlen;
1.5 itojun 761: u_int32_t *rtalertp;
1.2 itojun 762: u_int32_t *plenp;
763: {
764: struct ip6_hdr *ip6;
765: int optlen = 0;
766: u_int8_t *opt = opthead;
767: u_int16_t rtalert_val;
768:
769: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
770: switch(*opt) {
771: case IP6OPT_PAD1:
772: optlen = 1;
773: break;
774: case IP6OPT_PADN:
775: if (hbhlen < IP6OPT_MINLEN) {
776: ip6stat.ip6s_toosmall++;
777: goto bad;
778: }
779: optlen = *(opt + 1) + 2;
780: break;
781: case IP6OPT_RTALERT:
1.8 itojun 782: /* XXX may need check for alignment */
1.2 itojun 783: if (hbhlen < IP6OPT_RTALERT_LEN) {
784: ip6stat.ip6s_toosmall++;
785: goto bad;
786: }
787: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
788: /* XXX: should we discard the packet? */
789: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
790: *(opt + 1));
791: optlen = IP6OPT_RTALERT_LEN;
792: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
793: *rtalertp = ntohs(rtalert_val);
794: break;
795: case IP6OPT_JUMBO:
1.8 itojun 796: /* XXX may need check for alignment */
1.2 itojun 797: if (hbhlen < IP6OPT_JUMBO_LEN) {
798: ip6stat.ip6s_toosmall++;
799: goto bad;
800: }
801: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
802: /* XXX: should we discard the packet? */
803: log(LOG_ERR, "length of jumbopayload opt "
804: "is inconsistent(%d)",
805: *(opt + 1));
806: optlen = IP6OPT_JUMBO_LEN;
807:
808: /*
809: * We can simply cast because of the alignment
810: * requirement of the jumbo payload option.
811: */
1.8 itojun 812: #if 0
1.2 itojun 813: *plenp = ntohl(*(u_int32_t *)(opt + 2));
1.8 itojun 814: #else
815: bcopy(opt + 2, plenp, sizeof(*plenp));
816: *plenp = htonl(*plenp);
817: #endif
1.2 itojun 818: if (*plenp <= IPV6_MAXPACKET) {
819: /*
820: * jumbo payload length must be larger
821: * than 65535
822: */
823: ip6stat.ip6s_badoptions++;
824: icmp6_error(m, ICMP6_PARAM_PROB,
825: ICMP6_PARAMPROB_HEADER,
826: sizeof(struct ip6_hdr) +
827: sizeof(struct ip6_hbh) +
828: opt + 2 - opthead);
829: return(-1);
830: }
831:
832: ip6 = mtod(m, struct ip6_hdr *);
833: if (ip6->ip6_plen) {
834: /*
835: * IPv6 packets that have non 0 payload length
836: * must not contain a jumbo paylod option.
837: */
838: ip6stat.ip6s_badoptions++;
839: icmp6_error(m, ICMP6_PARAM_PROB,
840: ICMP6_PARAMPROB_HEADER,
841: sizeof(struct ip6_hdr) +
842: sizeof(struct ip6_hbh) +
843: opt - opthead);
844: return(-1);
845: }
846: break;
847: default: /* unknown option */
848: if (hbhlen < IP6OPT_MINLEN) {
849: ip6stat.ip6s_toosmall++;
850: goto bad;
851: }
852: if ((optlen = ip6_unknown_opt(opt, m,
853: sizeof(struct ip6_hdr) +
854: sizeof(struct ip6_hbh) +
855: opt - opthead)) == -1)
856: return(-1);
857: optlen += 2;
858: break;
859: }
860: }
861:
862: return(0);
863:
864: bad:
865: m_freem(m);
866: return(-1);
867: }
868:
869: /*
870: * Unknown option processing.
871: * The third argument `off' is the offset from the IPv6 header to the option,
872: * which is necessary if the IPv6 header the and option header and IPv6 header
873: * is not continuous in order to return an ICMPv6 error.
874: */
875: int
876: ip6_unknown_opt(optp, m, off)
877: u_int8_t *optp;
878: struct mbuf *m;
879: int off;
880: {
881: struct ip6_hdr *ip6;
882:
883: switch(IP6OPT_TYPE(*optp)) {
884: case IP6OPT_TYPE_SKIP: /* ignore the option */
885: return((int)*(optp + 1));
886: case IP6OPT_TYPE_DISCARD: /* silently discard */
887: m_freem(m);
888: return(-1);
889: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
890: ip6stat.ip6s_badoptions++;
891: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
892: return(-1);
893: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
894: ip6stat.ip6s_badoptions++;
895: ip6 = mtod(m, struct ip6_hdr *);
896: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
897: (m->m_flags & (M_BCAST|M_MCAST)))
898: m_freem(m);
899: else
900: icmp6_error(m, ICMP6_PARAM_PROB,
901: ICMP6_PARAMPROB_OPTION, off);
902: return(-1);
903: }
904:
905: m_freem(m); /* XXX: NOTREACHED */
906: return(-1);
907: }
908:
909: /*
1.9 itojun 910: * Create the "control" list for this pcb.
911: *
912: * The routine will be called from upper layer handlers like tcp6_input().
913: * Thus the routine assumes that the caller (tcp6_input) have already
914: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
915: * very first mbuf on the mbuf chain.
916: * We may want to add some infinite loop prevention or sanity checks for safety.
917: * (This applies only when you are using KAME mbuf chain restriction, i.e.
918: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 919: */
920: void
921: ip6_savecontrol(in6p, mp, ip6, m)
922: register struct in6pcb *in6p;
923: register struct mbuf **mp;
924: register struct ip6_hdr *ip6;
925: register struct mbuf *m;
926: {
927: struct proc *p = curproc; /* XXX */
1.9 itojun 928: int privileged;
1.2 itojun 929:
1.9 itojun 930: privileged = 0;
931: if (p && !suser(p->p_ucred, &p->p_acflag))
932: privileged++;
933:
934: #ifdef SO_TIMESTAMP
1.2 itojun 935: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
936: struct timeval tv;
937:
938: microtime(&tv);
939: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
940: SCM_TIMESTAMP, SOL_SOCKET);
941: if (*mp)
942: mp = &(*mp)->m_next;
943: }
1.9 itojun 944: #endif
1.2 itojun 945: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
946: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
947: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
948: IPPROTO_IPV6);
949: if (*mp)
950: mp = &(*mp)->m_next;
951: }
952:
953: #ifdef noyet
954: /* options were tossed above */
955: if (in6p->in6p_flags & IN6P_RECVOPTS)
956: /* broken */
957: /* ip6_srcroute doesn't do what we want here, need to fix */
958: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
959: /* broken */
960: #endif
961:
962: /* RFC 2292 sec. 5 */
963: if (in6p->in6p_flags & IN6P_PKTINFO) {
964: struct in6_pktinfo pi6;
965: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
966: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
967: pi6.ipi6_addr.s6_addr16[1] = 0;
968: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
969: ? m->m_pkthdr.rcvif->if_index
970: : 0;
971: *mp = sbcreatecontrol((caddr_t) &pi6,
972: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
973: IPPROTO_IPV6);
974: if (*mp)
975: mp = &(*mp)->m_next;
976: }
977: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
978: int hlim = ip6->ip6_hlim & 0xff;
979: *mp = sbcreatecontrol((caddr_t) &hlim,
980: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
981: if (*mp)
982: mp = &(*mp)->m_next;
983: }
984: /* IN6P_NEXTHOP - for outgoing packet only */
985:
986: /*
987: * IPV6_HOPOPTS socket option. We require super-user privilege
988: * for the option, but it might be too strict, since there might
989: * be some hop-by-hop options which can be returned to normal user.
990: * See RFC 2292 section 6.
991: */
1.9 itojun 992: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 993: /*
994: * Check if a hop-by-hop options header is contatined in the
995: * received packet, and if so, store the options as ancillary
996: * data. Note that a hop-by-hop options header must be
997: * just after the IPv6 header, which fact is assured through
998: * the IPv6 input processing.
999: */
1000: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1001: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1002: struct ip6_hbh *hbh;
1003: int hbhlen;
1004:
1005: #ifndef PULLDOWN_TEST
1006: hbh = (struct ip6_hbh *)(ip6 + 1);
1007: hbhlen = (hbh->ip6h_len + 1) << 3;
1008: #else
1009: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1010: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1011: if (hbh == NULL) {
1012: ip6stat.ip6s_tooshort++;
1013: return;
1014: }
1015: hbhlen = (hbh->ip6h_len + 1) << 3;
1016: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1017: sizeof(struct ip6_hdr), hbhlen);
1018: if (hbh == NULL) {
1019: ip6stat.ip6s_tooshort++;
1020: return;
1021: }
1022: #endif
1.2 itojun 1023:
1024: /*
1025: * XXX: We copy whole the header even if a jumbo
1026: * payload option is included, which option is to
1027: * be removed before returning in the RFC 2292.
1028: * But it's too painful operation...
1029: */
1.9 itojun 1030: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1031: IPV6_HOPOPTS, IPPROTO_IPV6);
1032: if (*mp)
1033: mp = &(*mp)->m_next;
1034: }
1035: }
1036:
1037: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1038: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1039: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1040: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1041:
1042: /*
1043: * Search for destination options headers or routing
1044: * header(s) through the header chain, and stores each
1045: * header as ancillary data.
1046: * Note that the order of the headers remains in
1047: * the chain of ancillary data.
1048: */
1049: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1050: struct ip6_ext *ip6e;
1051: int elen;
1052:
1053: #ifndef PULLDOWN_TEST
1054: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1055: if (nxt == IPPROTO_AH)
1056: elen = (ip6e->ip6e_len + 2) << 2;
1057: else
1058: elen = (ip6e->ip6e_len + 1) << 3;
1059: #else
1060: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1061: sizeof(struct ip6_ext));
1062: if (ip6e == NULL) {
1063: ip6stat.ip6s_tooshort++;
1064: return;
1065: }
1066: if (nxt == IPPROTO_AH)
1067: elen = (ip6e->ip6e_len + 2) << 2;
1068: else
1069: elen = (ip6e->ip6e_len + 1) << 3;
1070: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1071: if (ip6e == NULL) {
1072: ip6stat.ip6s_tooshort++;
1073: return;
1074: }
1075: #endif
1.2 itojun 1076:
1077: switch(nxt) {
1078: case IPPROTO_DSTOPTS:
1079: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1080: break;
1081:
1082: /*
1083: * We also require super-user privilege for
1084: * the option.
1085: * See the comments on IN6_HOPOPTS.
1086: */
1.9 itojun 1087: if (!privileged)
1.2 itojun 1088: break;
1089:
1.9 itojun 1090: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1091: IPV6_DSTOPTS,
1092: IPPROTO_IPV6);
1093: if (*mp)
1094: mp = &(*mp)->m_next;
1095: break;
1096:
1097: case IPPROTO_ROUTING:
1098: if (!in6p->in6p_flags & IN6P_RTHDR)
1099: break;
1100:
1.9 itojun 1101: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1102: IPV6_RTHDR,
1103: IPPROTO_IPV6);
1104: if (*mp)
1105: mp = &(*mp)->m_next;
1106: break;
1107:
1108: case IPPROTO_UDP:
1109: case IPPROTO_TCP:
1110: case IPPROTO_ICMPV6:
1111: default:
1112: /*
1113: * stop search if we encounter an upper
1114: * layer protocol headers.
1115: */
1116: goto loopend;
1117:
1118: case IPPROTO_HOPOPTS:
1119: case IPPROTO_AH: /* is it possible? */
1120: break;
1121: }
1122:
1123: /* proceed with the next header. */
1.9 itojun 1124: off += elen;
1.2 itojun 1125: nxt = ip6e->ip6e_nxt;
1126: }
1127: loopend:
1128: }
1.9 itojun 1129: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1130: /* to be done */
1131: }
1.9 itojun 1132: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1133: /* to be done */
1134: }
1135: /* IN6P_RTHDR - to be done */
1136:
1137: }
1138:
1139: /*
1140: * Get pointer to the previous header followed by the header
1141: * currently processed.
1142: * XXX: This function supposes that
1143: * M includes all headers,
1144: * the next header field and the header length field of each header
1145: * are valid, and
1146: * the sum of each header length equals to OFF.
1147: * Because of these assumptions, this function must be called very
1148: * carefully. Moreover, it will not be used in the near future when
1149: * we develop `neater' mechanism to process extension headers.
1150: */
1151: char *
1152: ip6_get_prevhdr(m, off)
1153: struct mbuf *m;
1154: int off;
1155: {
1156: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1157:
1158: if (off == sizeof(struct ip6_hdr))
1159: return(&ip6->ip6_nxt);
1160: else {
1161: int len, nxt;
1162: struct ip6_ext *ip6e = NULL;
1163:
1164: nxt = ip6->ip6_nxt;
1165: len = sizeof(struct ip6_hdr);
1166: while (len < off) {
1167: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1168:
1169: switch(nxt) {
1170: case IPPROTO_FRAGMENT:
1171: len += sizeof(struct ip6_frag);
1172: break;
1173: case IPPROTO_AH:
1174: len += (ip6e->ip6e_len + 2) << 2;
1175: break;
1176: default:
1177: len += (ip6e->ip6e_len + 1) << 3;
1178: break;
1179: }
1180: nxt = ip6e->ip6e_nxt;
1181: }
1182: if (ip6e)
1183: return(&ip6e->ip6e_nxt);
1184: else
1185: return NULL;
1.18 itojun 1186: }
1187: }
1188:
1189: /*
1190: * get next header offset. m will be retained.
1191: */
1192: int
1193: ip6_nexthdr(m, off, proto, nxtp)
1194: struct mbuf *m;
1195: int off;
1196: int proto;
1197: int *nxtp;
1198: {
1199: struct ip6_hdr ip6;
1200: struct ip6_ext ip6e;
1201: struct ip6_frag fh;
1202:
1203: /* just in case */
1204: if (m == NULL)
1205: panic("ip6_nexthdr: m == NULL");
1206: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1207: return -1;
1208:
1209: switch (proto) {
1210: case IPPROTO_IPV6:
1211: if (m->m_pkthdr.len < off + sizeof(ip6))
1212: return -1;
1213: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1214: if (nxtp)
1215: *nxtp = ip6.ip6_nxt;
1216: off += sizeof(ip6);
1217: return off;
1218:
1219: case IPPROTO_FRAGMENT:
1220: /*
1221: * terminate parsing if it is not the first fragment,
1222: * it does not make sense to parse through it.
1223: */
1224: if (m->m_pkthdr.len < off + sizeof(fh))
1225: return -1;
1226: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1227: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1228: return -1;
1229: if (nxtp)
1230: *nxtp = fh.ip6f_nxt;
1231: off += sizeof(struct ip6_frag);
1232: return off;
1233:
1234: case IPPROTO_AH:
1235: if (m->m_pkthdr.len < off + sizeof(ip6e))
1236: return -1;
1237: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1238: if (nxtp)
1239: *nxtp = ip6e.ip6e_nxt;
1240: off += (ip6e.ip6e_len + 2) << 2;
1241: return off;
1242:
1243: case IPPROTO_HOPOPTS:
1244: case IPPROTO_ROUTING:
1245: case IPPROTO_DSTOPTS:
1246: if (m->m_pkthdr.len < off + sizeof(ip6e))
1247: return -1;
1248: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1249: if (nxtp)
1250: *nxtp = ip6e.ip6e_nxt;
1251: off += (ip6e.ip6e_len + 1) << 3;
1252: return off;
1253:
1254: case IPPROTO_NONE:
1255: case IPPROTO_ESP:
1256: case IPPROTO_IPCOMP:
1257: /* give up */
1258: return -1;
1259:
1260: default:
1261: return -1;
1262: }
1263:
1264: return -1;
1265: }
1266:
1267: /*
1268: * get offset for the last header in the chain. m will be kept untainted.
1269: */
1270: int
1271: ip6_lasthdr(m, off, proto, nxtp)
1272: struct mbuf *m;
1273: int off;
1274: int proto;
1275: int *nxtp;
1276: {
1277: int newoff;
1278: int nxt;
1279:
1280: if (!nxtp) {
1281: nxt = -1;
1282: nxtp = &nxt;
1283: }
1284: while (1) {
1285: newoff = ip6_nexthdr(m, off, proto, nxtp);
1286: if (newoff < 0)
1287: return off;
1288: else if (newoff < off)
1289: return -1; /* invalid */
1290: else if (newoff == off)
1291: return newoff;
1292:
1293: off = newoff;
1294: proto = *nxtp;
1.2 itojun 1295: }
1296: }
1297:
1298: /*
1299: * System control for IP6
1300: */
1301:
1302: u_char inet6ctlerrmap[PRC_NCMDS] = {
1303: 0, 0, 0, 0,
1304: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1305: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1306: EMSGSIZE, EHOSTUNREACH, 0, 0,
1307: 0, 0, 0, 0,
1308: ENOPROTOOPT
1309: };
1310:
1311: #include <vm/vm.h>
1312: #include <sys/sysctl.h>
1313:
1314: int
1315: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1316: int *name;
1317: u_int namelen;
1318: void *oldp;
1319: size_t *oldlenp;
1320: void *newp;
1321: size_t newlen;
1322: {
1323: /* All sysctl names at this level are terminal. */
1324: if (namelen != 1)
1325: return ENOTDIR;
1326:
1327: switch (name[0]) {
1328:
1329: case IPV6CTL_FORWARDING:
1330: return sysctl_int(oldp, oldlenp, newp, newlen,
1331: &ip6_forwarding);
1332: case IPV6CTL_SENDREDIRECTS:
1333: return sysctl_int(oldp, oldlenp, newp, newlen,
1334: &ip6_sendredirects);
1335: case IPV6CTL_DEFHLIM:
1336: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1337: case IPV6CTL_MAXFRAGPACKETS:
1338: return sysctl_int(oldp, oldlenp, newp, newlen,
1339: &ip6_maxfragpackets);
1340: case IPV6CTL_ACCEPT_RTADV:
1341: return sysctl_int(oldp, oldlenp, newp, newlen,
1342: &ip6_accept_rtadv);
1343: case IPV6CTL_KEEPFAITH:
1344: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1345: case IPV6CTL_LOG_INTERVAL:
1346: return sysctl_int(oldp, oldlenp, newp, newlen,
1347: &ip6_log_interval);
1348: case IPV6CTL_HDRNESTLIMIT:
1349: return sysctl_int(oldp, oldlenp, newp, newlen,
1350: &ip6_hdrnestlimit);
1351: case IPV6CTL_DAD_COUNT:
1352: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1353: case IPV6CTL_AUTO_FLOWLABEL:
1354: return sysctl_int(oldp, oldlenp, newp, newlen,
1355: &ip6_auto_flowlabel);
1356: case IPV6CTL_DEFMCASTHLIM:
1357: return sysctl_int(oldp, oldlenp, newp, newlen,
1358: &ip6_defmcasthlim);
1359: case IPV6CTL_GIF_HLIM:
1360: return sysctl_int(oldp, oldlenp, newp, newlen,
1361: &ip6_gif_hlim);
1362: case IPV6CTL_KAME_VERSION:
1363: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1364: case IPV6CTL_USE_DEPRECATED:
1365: return sysctl_int(oldp, oldlenp, newp, newlen,
1366: &ip6_use_deprecated);
1.10 itojun 1367: case IPV6CTL_RR_PRUNE:
1368: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1369: #ifndef INET6_BINDV6ONLY
1.11 itojun 1370: case IPV6CTL_BINDV6ONLY:
1371: return sysctl_int(oldp, oldlenp, newp, newlen,
1372: &ip6_bindv6only);
1373: #endif
1.2 itojun 1374: default:
1375: return EOPNOTSUPP;
1376: }
1377: /* NOTREACHED */
1378: }
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