Annotation of src/sys/netinet6/ip6_input.c, Revision 1.20
1.20 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.19 2000/03/23 07:03:30 thorpej 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: {
197: /*
198: * to route local address of p2p link to loopback,
199: * assign loopback address first.
200: */
1.20 ! itojun 201: in6_ifattach(&loif[0], NULL);
1.2 itojun 202:
203: /* nd6_timer_init */
1.19 thorpej 204: callout_init(&nd6_timer_ch);
205: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 206: /* router renumbering prefix list maintenance */
1.19 thorpej 207: callout_init(&in6_rr_timer_ch);
208: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 209: }
210:
211: /*
212: * IP6 input interrupt handling. Just pass the packet to ip6_input.
213: */
214: void
215: ip6intr()
216: {
217: int s;
218: struct mbuf *m;
219:
220: for (;;) {
221: s = splimp();
222: IF_DEQUEUE(&ip6intrq, m);
223: splx(s);
224: if (m == 0)
225: return;
226: ip6_input(m);
227: }
228: }
229:
230: extern struct route_in6 ip6_forward_rt;
231:
232: void
233: ip6_input(m)
234: struct mbuf *m;
235: {
1.9 itojun 236: struct ip6_hdr *ip6;
1.2 itojun 237: int off = sizeof(struct ip6_hdr), nest;
238: u_int32_t plen;
1.5 itojun 239: u_int32_t rtalert = ~0;
1.2 itojun 240: int nxt, ours = 0;
1.9 itojun 241: struct ifnet *deliverifp = NULL;
1.15 darrenr 242: #ifdef PFIL_HOOKS
243: struct packet_filter_hook *pfh;
244: struct mbuf *m0;
245: int rv;
246: #endif /* PFIL_HOOKS */
1.2 itojun 247:
248: #ifdef IPSEC
249: /*
250: * should the inner packet be considered authentic?
251: * see comment in ah4_input().
252: */
253: if (m) {
254: m->m_flags &= ~M_AUTHIPHDR;
255: m->m_flags &= ~M_AUTHIPDGM;
256: }
257: #endif
1.9 itojun 258:
1.2 itojun 259: /*
260: * mbuf statistics by kazu
261: */
262: if (m->m_flags & M_EXT) {
263: if (m->m_next)
264: ip6stat.ip6s_mext2m++;
265: else
266: ip6stat.ip6s_mext1++;
267: } else {
268: if (m->m_next) {
1.9 itojun 269: if (m->m_flags & M_LOOP) {
1.2 itojun 270: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.9 itojun 271: }
1.2 itojun 272: else if (m->m_pkthdr.rcvif->if_index <= 31)
273: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
274: else
275: ip6stat.ip6s_m2m[0]++;
276: } else
277: ip6stat.ip6s_m1++;
278: }
279:
1.9 itojun 280: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
281: ip6stat.ip6s_total++;
282:
283: #ifndef PULLDOWN_TEST
284: /* XXX is the line really necessary? */
1.2 itojun 285: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 286: #endif
1.2 itojun 287:
1.9 itojun 288: if (m->m_len < sizeof(struct ip6_hdr)) {
289: struct ifnet *inifp;
290: inifp = m->m_pkthdr.rcvif;
291: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
292: ip6stat.ip6s_toosmall++;
293: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
294: return;
295: }
1.2 itojun 296: }
297:
298: ip6 = mtod(m, struct ip6_hdr *);
299:
300: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
301: ip6stat.ip6s_badvers++;
1.9 itojun 302: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 303: goto bad;
304: }
1.15 darrenr 305:
306: #ifdef PFIL_HOOKS
307: /*
308: * Run through list of hooks for input packets. If there are any
309: * filters which require that additional packets in the flow are
310: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
311: * Note that filters must _never_ set this flag, as another filter
312: * in the list may have previously cleared it.
313: */
314: m0 = m;
1.16 darrenr 315: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15 darrenr 316: for (; pfh; pfh = pfh->pfil_link.tqe_next)
317: if (pfh->pfil_func) {
318: rv = pfh->pfil_func(ip6, sizeof(*ip6),
319: m->m_pkthdr.rcvif, 0, &m0);
320: if (rv)
321: return;
322: m = m0;
323: if (m == NULL)
324: return;
325: ip6 = mtod(m, struct ip6_hdr *);
326: }
327: #endif /* PFIL_HOOKS */
328:
1.2 itojun 329:
330: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
331:
1.9 itojun 332: #ifdef IPV6FIREWALL
333: /*
334: * Check with the firewall...
335: */
336: if (ip6_fw_chk_ptr) {
337: u_short port = 0;
338: /* If ipfw says divert, we have to just drop packet */
339: /* use port as a dummy argument */
340: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
341: m_freem(m);
342: m = NULL;
343: }
344: if (!m)
345: return;
346: }
347: #endif
348:
1.2 itojun 349: /*
350: * Scope check
351: */
352: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
353: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
354: ip6stat.ip6s_badscope++;
1.9 itojun 355: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 356: goto bad;
357: }
1.13 itojun 358: /*
359: * The following check is not documented in the spec. Malicious party
360: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
361: * bypass security checks (act as if it was from 127.0.0.1 by using
362: * IPv6 src ::ffff:127.0.0.1). Be cautious.
363: */
364: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
365: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
366: ip6stat.ip6s_badscope++;
367: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
368: goto bad;
369: }
1.17 itojun 370: #if 0
1.13 itojun 371: /*
1.17 itojun 372: * Reject packets with IPv4 compatible addresses (auto tunnel).
373: *
374: * The code forbids auto tunnel relay case in RFC1933 (the check is
375: * stronger than RFC1933). We may want to re-enable it if mech-xx
376: * is revised to forbid relaying case.
1.13 itojun 377: */
378: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
379: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
380: ip6stat.ip6s_badscope++;
381: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
382: goto bad;
383: }
384: #endif
1.2 itojun 385: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
386: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
387: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
388: ours = 1;
1.9 itojun 389: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 390: goto hbhcheck;
391: } else {
392: ip6stat.ip6s_badscope++;
1.9 itojun 393: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 394: goto bad;
395: }
396: }
397:
398: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
399: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
400: ours = 1;
1.9 itojun 401: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 402: goto hbhcheck;
403: }
404: } else {
405: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
406: ip6->ip6_src.s6_addr16[1]
407: = htons(m->m_pkthdr.rcvif->if_index);
408: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
409: ip6->ip6_dst.s6_addr16[1]
410: = htons(m->m_pkthdr.rcvif->if_index);
411: }
412:
1.12 itojun 413: #ifdef PTR
1.9 itojun 414: /*
415: *
416: */
417: if (ip6_protocol_tr)
418: {
419: struct mbuf *m1 = NULL;
420:
421: switch (ptr_in6(m, &m1))
422: {
423: case IPPROTO_IP: goto mcastcheck;
424: case IPPROTO_IPV4: ip_forward(m1, 0); break;
425: case IPPROTO_IPV6: ip6_forward(m1, 0); break;
426: case IPPROTO_MAX: /* discard this packet */
427: default:
428: }
429:
430: if (m != m1)
431: m_freem(m);
432:
433: return;
434: }
435:
436: mcastcheck:
437: #endif
438:
1.2 itojun 439: /*
440: * Multicast check
441: */
442: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
443: struct in6_multi *in6m = 0;
1.9 itojun 444:
445: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 446: /*
447: * See if we belong to the destination multicast group on the
448: * arrival interface.
449: */
450: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
451: if (in6m)
452: ours = 1;
453: else if (!ip6_mrouter) {
454: ip6stat.ip6s_notmember++;
455: ip6stat.ip6s_cantforward++;
1.9 itojun 456: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 457: goto bad;
458: }
1.9 itojun 459: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 460: goto hbhcheck;
461: }
462:
463: /*
464: * Unicast check
465: */
466: if (ip6_forward_rt.ro_rt == 0 ||
467: !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
468: &ip6_forward_rt.ro_dst.sin6_addr)) {
469: if (ip6_forward_rt.ro_rt) {
470: RTFREE(ip6_forward_rt.ro_rt);
471: ip6_forward_rt.ro_rt = 0;
472: }
473: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
474: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
475: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
476: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
477:
1.9 itojun 478: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 479: }
480:
481: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
482:
483: /*
484: * Accept the packet if the forwarding interface to the destination
485: * according to the routing table is the loopback interface,
486: * unless the associated route has a gateway.
487: * Note that this approach causes to accept a packet if there is a
488: * route to the loopback interface for the destination of the packet.
489: * But we think it's even useful in some situations, e.g. when using
490: * a special daemon which wants to intercept the packet.
491: */
492: if (ip6_forward_rt.ro_rt &&
493: (ip6_forward_rt.ro_rt->rt_flags &
494: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
495: #if 0
496: /*
497: * The check below is redundant since the comparison of
498: * the destination and the key of the rtentry has
499: * already done through looking up the routing table.
500: */
501: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
502: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
503: #endif
1.9 itojun 504: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 505: struct in6_ifaddr *ia6 =
506: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
507: /* packet to tentative address must not be received */
508: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
509: m->m_flags |= M_ANYCAST6;
510: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
511: /* this interface is ready */
512: ours = 1;
1.9 itojun 513: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 514: goto hbhcheck;
515: } else {
516: /* this interface is not ready, fall through */
517: }
518: }
519:
520: /*
521: * FAITH(Firewall Aided Internet Translator)
522: */
523: #if defined(NFAITH) && 0 < NFAITH
524: if (ip6_keepfaith) {
525: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
526: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
527: /* XXX do we need more sanity checks? */
528: ours = 1;
1.9 itojun 529: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
530: goto hbhcheck;
531: }
532: }
533: #endif
534:
535: #if 0
536: {
537: /*
538: * Last resort: check in6_ifaddr for incoming interface.
539: * The code is here until I update the "goto ours hack" code above
540: * working right.
541: */
542: struct ifaddr *ifa;
543: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
544: ifa;
545: ifa = ifa->ifa_list.tqe_next) {
546: if (ifa->ifa_addr == NULL)
547: continue; /* just for safety */
548: if (ifa->ifa_addr->sa_family != AF_INET6)
549: continue;
550: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
551: ours = 1;
552: deliverifp = ifa->ifa_ifp;
1.2 itojun 553: goto hbhcheck;
554: }
555: }
1.9 itojun 556: }
1.2 itojun 557: #endif
558:
559: /*
560: * Now there is no reason to process the packet if it's not our own
561: * and we're not a router.
562: */
563: if (!ip6_forwarding) {
564: ip6stat.ip6s_cantforward++;
1.9 itojun 565: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 566: goto bad;
567: }
568:
569: hbhcheck:
570: /*
571: * Process Hop-by-Hop options header if it's contained.
572: * m may be modified in ip6_hopopts_input().
573: * If a JumboPayload option is included, plen will also be modified.
574: */
575: plen = (u_int32_t)ntohs(ip6->ip6_plen);
576: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 577: struct ip6_hbh *hbh;
578:
579: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
580: #if 0 /*touches NULL pointer*/
581: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
582: #endif
1.2 itojun 583: return; /* m have already been freed */
1.9 itojun 584: }
1.2 itojun 585: /* adjust pointer */
586: ip6 = mtod(m, struct ip6_hdr *);
1.9 itojun 587: #ifndef PULLDOWN_TEST
588: /* ip6_hopopts_input() ensures that mbuf is contiguous */
589: hbh = (struct ip6_hbh *)(ip6 + 1);
590: #else
591: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
592: sizeof(struct ip6_hbh));
593: if (hbh == NULL) {
594: ip6stat.ip6s_tooshort++;
595: return;
596: }
597: #endif
598: nxt = hbh->ip6h_nxt;
1.2 itojun 599:
600: /*
601: * accept the packet if a router alert option is included
602: * and we act as an IPv6 router.
603: */
1.5 itojun 604: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 605: ours = 1;
606: } else
607: nxt = ip6->ip6_nxt;
608:
609: /*
610: * Check that the amount of data in the buffers
611: * is as at least much as the IPv6 header would have us expect.
612: * Trim mbufs if longer than we expect.
613: * Drop packet if shorter than we expect.
614: */
615: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
616: ip6stat.ip6s_tooshort++;
1.9 itojun 617: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 618: goto bad;
619: }
620: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
621: if (m->m_len == m->m_pkthdr.len) {
622: m->m_len = sizeof(struct ip6_hdr) + plen;
623: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
624: } else
625: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
626: }
627:
628: /*
629: * Forward if desirable.
630: */
631: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
632: /*
633: * If we are acting as a multicast router, all
634: * incoming multicast packets are passed to the
635: * kernel-level multicast forwarding function.
636: * The packet is returned (relatively) intact; if
637: * ip6_mforward() returns a non-zero value, the packet
638: * must be discarded, else it may be accepted below.
639: */
640: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
641: ip6stat.ip6s_cantforward++;
642: m_freem(m);
643: return;
644: }
645: if (!ours) {
646: m_freem(m);
647: return;
648: }
649: }
650: else if (!ours) {
651: ip6_forward(m, 0);
652: return;
653: }
654:
655: /*
656: * Tell launch routine the next header
657: */
1.12 itojun 658: #ifdef IFA_STATS
1.9 itojun 659: if (IFA_STATS && deliverifp != NULL) {
660: struct in6_ifaddr *ia6;
661: ip6 = mtod(m, struct ip6_hdr *);
662: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
663: if (ia6)
664: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
665: }
666: #endif
1.2 itojun 667: ip6stat.ip6s_delivered++;
1.9 itojun 668: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 669: nest = 0;
670: while (nxt != IPPROTO_DONE) {
671: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
672: ip6stat.ip6s_toomanyhdr++;
673: goto bad;
674: }
1.8 itojun 675:
676: /*
677: * protection against faulty packet - there should be
678: * more sanity checks in header chain processing.
679: */
680: if (m->m_pkthdr.len < off) {
681: ip6stat.ip6s_tooshort++;
1.9 itojun 682: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 683: goto bad;
684: }
685:
1.2 itojun 686: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
687: }
688: return;
689: bad:
690: m_freem(m);
691: }
692:
693: /*
694: * Hop-by-Hop options header processing. If a valid jumbo payload option is
695: * included, the real payload length will be stored in plenp.
696: */
697: static int
698: ip6_hopopts_input(plenp, rtalertp, mp, offp)
699: u_int32_t *plenp;
1.5 itojun 700: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 701: struct mbuf **mp;
702: int *offp;
703: {
704: register struct mbuf *m = *mp;
705: int off = *offp, hbhlen;
706: struct ip6_hbh *hbh;
707: u_int8_t *opt;
708:
709: /* validation of the length of the header */
1.9 itojun 710: #ifndef PULLDOWN_TEST
1.2 itojun 711: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
712: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
713: hbhlen = (hbh->ip6h_len + 1) << 3;
714:
715: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
716: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 717: #else
718: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
719: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
720: if (hbh == NULL) {
721: ip6stat.ip6s_tooshort++;
722: return -1;
723: }
724: hbhlen = (hbh->ip6h_len + 1) << 3;
725: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
726: hbhlen);
727: if (hbh == NULL) {
728: ip6stat.ip6s_tooshort++;
729: return -1;
730: }
731: #endif
1.2 itojun 732: off += hbhlen;
733: hbhlen -= sizeof(struct ip6_hbh);
734: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
735:
736: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
737: hbhlen, rtalertp, plenp) < 0)
738: return(-1);
739:
740: *offp = off;
741: *mp = m;
742: return(0);
743: }
744:
745: /*
746: * Search header for all Hop-by-hop options and process each option.
747: * This function is separate from ip6_hopopts_input() in order to
748: * handle a case where the sending node itself process its hop-by-hop
749: * options header. In such a case, the function is called from ip6_output().
750: */
751: int
752: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
753: struct mbuf *m;
754: u_int8_t *opthead;
755: int hbhlen;
1.5 itojun 756: u_int32_t *rtalertp;
1.2 itojun 757: u_int32_t *plenp;
758: {
759: struct ip6_hdr *ip6;
760: int optlen = 0;
761: u_int8_t *opt = opthead;
762: u_int16_t rtalert_val;
763:
764: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
765: switch(*opt) {
766: case IP6OPT_PAD1:
767: optlen = 1;
768: break;
769: case IP6OPT_PADN:
770: if (hbhlen < IP6OPT_MINLEN) {
771: ip6stat.ip6s_toosmall++;
772: goto bad;
773: }
774: optlen = *(opt + 1) + 2;
775: break;
776: case IP6OPT_RTALERT:
1.8 itojun 777: /* XXX may need check for alignment */
1.2 itojun 778: if (hbhlen < IP6OPT_RTALERT_LEN) {
779: ip6stat.ip6s_toosmall++;
780: goto bad;
781: }
782: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
783: /* XXX: should we discard the packet? */
784: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
785: *(opt + 1));
786: optlen = IP6OPT_RTALERT_LEN;
787: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
788: *rtalertp = ntohs(rtalert_val);
789: break;
790: case IP6OPT_JUMBO:
1.8 itojun 791: /* XXX may need check for alignment */
1.2 itojun 792: if (hbhlen < IP6OPT_JUMBO_LEN) {
793: ip6stat.ip6s_toosmall++;
794: goto bad;
795: }
796: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
797: /* XXX: should we discard the packet? */
798: log(LOG_ERR, "length of jumbopayload opt "
799: "is inconsistent(%d)",
800: *(opt + 1));
801: optlen = IP6OPT_JUMBO_LEN;
802:
803: /*
804: * We can simply cast because of the alignment
805: * requirement of the jumbo payload option.
806: */
1.8 itojun 807: #if 0
1.2 itojun 808: *plenp = ntohl(*(u_int32_t *)(opt + 2));
1.8 itojun 809: #else
810: bcopy(opt + 2, plenp, sizeof(*plenp));
811: *plenp = htonl(*plenp);
812: #endif
1.2 itojun 813: if (*plenp <= IPV6_MAXPACKET) {
814: /*
815: * jumbo payload length must be larger
816: * than 65535
817: */
818: ip6stat.ip6s_badoptions++;
819: icmp6_error(m, ICMP6_PARAM_PROB,
820: ICMP6_PARAMPROB_HEADER,
821: sizeof(struct ip6_hdr) +
822: sizeof(struct ip6_hbh) +
823: opt + 2 - opthead);
824: return(-1);
825: }
826:
827: ip6 = mtod(m, struct ip6_hdr *);
828: if (ip6->ip6_plen) {
829: /*
830: * IPv6 packets that have non 0 payload length
831: * must not contain a jumbo paylod option.
832: */
833: ip6stat.ip6s_badoptions++;
834: icmp6_error(m, ICMP6_PARAM_PROB,
835: ICMP6_PARAMPROB_HEADER,
836: sizeof(struct ip6_hdr) +
837: sizeof(struct ip6_hbh) +
838: opt - opthead);
839: return(-1);
840: }
841: break;
842: default: /* unknown option */
843: if (hbhlen < IP6OPT_MINLEN) {
844: ip6stat.ip6s_toosmall++;
845: goto bad;
846: }
847: if ((optlen = ip6_unknown_opt(opt, m,
848: sizeof(struct ip6_hdr) +
849: sizeof(struct ip6_hbh) +
850: opt - opthead)) == -1)
851: return(-1);
852: optlen += 2;
853: break;
854: }
855: }
856:
857: return(0);
858:
859: bad:
860: m_freem(m);
861: return(-1);
862: }
863:
864: /*
865: * Unknown option processing.
866: * The third argument `off' is the offset from the IPv6 header to the option,
867: * which is necessary if the IPv6 header the and option header and IPv6 header
868: * is not continuous in order to return an ICMPv6 error.
869: */
870: int
871: ip6_unknown_opt(optp, m, off)
872: u_int8_t *optp;
873: struct mbuf *m;
874: int off;
875: {
876: struct ip6_hdr *ip6;
877:
878: switch(IP6OPT_TYPE(*optp)) {
879: case IP6OPT_TYPE_SKIP: /* ignore the option */
880: return((int)*(optp + 1));
881: case IP6OPT_TYPE_DISCARD: /* silently discard */
882: m_freem(m);
883: return(-1);
884: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
885: ip6stat.ip6s_badoptions++;
886: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
887: return(-1);
888: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
889: ip6stat.ip6s_badoptions++;
890: ip6 = mtod(m, struct ip6_hdr *);
891: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
892: (m->m_flags & (M_BCAST|M_MCAST)))
893: m_freem(m);
894: else
895: icmp6_error(m, ICMP6_PARAM_PROB,
896: ICMP6_PARAMPROB_OPTION, off);
897: return(-1);
898: }
899:
900: m_freem(m); /* XXX: NOTREACHED */
901: return(-1);
902: }
903:
904: /*
1.9 itojun 905: * Create the "control" list for this pcb.
906: *
907: * The routine will be called from upper layer handlers like tcp6_input().
908: * Thus the routine assumes that the caller (tcp6_input) have already
909: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
910: * very first mbuf on the mbuf chain.
911: * We may want to add some infinite loop prevention or sanity checks for safety.
912: * (This applies only when you are using KAME mbuf chain restriction, i.e.
913: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 914: */
915: void
916: ip6_savecontrol(in6p, mp, ip6, m)
917: register struct in6pcb *in6p;
918: register struct mbuf **mp;
919: register struct ip6_hdr *ip6;
920: register struct mbuf *m;
921: {
922: struct proc *p = curproc; /* XXX */
1.9 itojun 923: int privileged;
1.2 itojun 924:
1.9 itojun 925: privileged = 0;
926: if (p && !suser(p->p_ucred, &p->p_acflag))
927: privileged++;
928:
929: #ifdef SO_TIMESTAMP
1.2 itojun 930: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
931: struct timeval tv;
932:
933: microtime(&tv);
934: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
935: SCM_TIMESTAMP, SOL_SOCKET);
936: if (*mp)
937: mp = &(*mp)->m_next;
938: }
1.9 itojun 939: #endif
1.2 itojun 940: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
941: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
942: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
943: IPPROTO_IPV6);
944: if (*mp)
945: mp = &(*mp)->m_next;
946: }
947:
948: #ifdef noyet
949: /* options were tossed above */
950: if (in6p->in6p_flags & IN6P_RECVOPTS)
951: /* broken */
952: /* ip6_srcroute doesn't do what we want here, need to fix */
953: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
954: /* broken */
955: #endif
956:
957: /* RFC 2292 sec. 5 */
958: if (in6p->in6p_flags & IN6P_PKTINFO) {
959: struct in6_pktinfo pi6;
960: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
961: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
962: pi6.ipi6_addr.s6_addr16[1] = 0;
963: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
964: ? m->m_pkthdr.rcvif->if_index
965: : 0;
966: *mp = sbcreatecontrol((caddr_t) &pi6,
967: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
968: IPPROTO_IPV6);
969: if (*mp)
970: mp = &(*mp)->m_next;
971: }
972: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
973: int hlim = ip6->ip6_hlim & 0xff;
974: *mp = sbcreatecontrol((caddr_t) &hlim,
975: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
976: if (*mp)
977: mp = &(*mp)->m_next;
978: }
979: /* IN6P_NEXTHOP - for outgoing packet only */
980:
981: /*
982: * IPV6_HOPOPTS socket option. We require super-user privilege
983: * for the option, but it might be too strict, since there might
984: * be some hop-by-hop options which can be returned to normal user.
985: * See RFC 2292 section 6.
986: */
1.9 itojun 987: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 988: /*
989: * Check if a hop-by-hop options header is contatined in the
990: * received packet, and if so, store the options as ancillary
991: * data. Note that a hop-by-hop options header must be
992: * just after the IPv6 header, which fact is assured through
993: * the IPv6 input processing.
994: */
995: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
996: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 997: struct ip6_hbh *hbh;
998: int hbhlen;
999:
1000: #ifndef PULLDOWN_TEST
1001: hbh = (struct ip6_hbh *)(ip6 + 1);
1002: hbhlen = (hbh->ip6h_len + 1) << 3;
1003: #else
1004: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1005: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1006: if (hbh == NULL) {
1007: ip6stat.ip6s_tooshort++;
1008: return;
1009: }
1010: hbhlen = (hbh->ip6h_len + 1) << 3;
1011: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1012: sizeof(struct ip6_hdr), hbhlen);
1013: if (hbh == NULL) {
1014: ip6stat.ip6s_tooshort++;
1015: return;
1016: }
1017: #endif
1.2 itojun 1018:
1019: /*
1020: * XXX: We copy whole the header even if a jumbo
1021: * payload option is included, which option is to
1022: * be removed before returning in the RFC 2292.
1023: * But it's too painful operation...
1024: */
1.9 itojun 1025: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1026: IPV6_HOPOPTS, IPPROTO_IPV6);
1027: if (*mp)
1028: mp = &(*mp)->m_next;
1029: }
1030: }
1031:
1032: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1033: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1034: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1035: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1036:
1037: /*
1038: * Search for destination options headers or routing
1039: * header(s) through the header chain, and stores each
1040: * header as ancillary data.
1041: * Note that the order of the headers remains in
1042: * the chain of ancillary data.
1043: */
1044: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1045: struct ip6_ext *ip6e;
1046: int elen;
1047:
1048: #ifndef PULLDOWN_TEST
1049: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1050: if (nxt == IPPROTO_AH)
1051: elen = (ip6e->ip6e_len + 2) << 2;
1052: else
1053: elen = (ip6e->ip6e_len + 1) << 3;
1054: #else
1055: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1056: sizeof(struct ip6_ext));
1057: if (ip6e == NULL) {
1058: ip6stat.ip6s_tooshort++;
1059: return;
1060: }
1061: if (nxt == IPPROTO_AH)
1062: elen = (ip6e->ip6e_len + 2) << 2;
1063: else
1064: elen = (ip6e->ip6e_len + 1) << 3;
1065: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1066: if (ip6e == NULL) {
1067: ip6stat.ip6s_tooshort++;
1068: return;
1069: }
1070: #endif
1.2 itojun 1071:
1072: switch(nxt) {
1073: case IPPROTO_DSTOPTS:
1074: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1075: break;
1076:
1077: /*
1078: * We also require super-user privilege for
1079: * the option.
1080: * See the comments on IN6_HOPOPTS.
1081: */
1.9 itojun 1082: if (!privileged)
1.2 itojun 1083: break;
1084:
1.9 itojun 1085: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1086: IPV6_DSTOPTS,
1087: IPPROTO_IPV6);
1088: if (*mp)
1089: mp = &(*mp)->m_next;
1090: break;
1091:
1092: case IPPROTO_ROUTING:
1093: if (!in6p->in6p_flags & IN6P_RTHDR)
1094: break;
1095:
1.9 itojun 1096: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1097: IPV6_RTHDR,
1098: IPPROTO_IPV6);
1099: if (*mp)
1100: mp = &(*mp)->m_next;
1101: break;
1102:
1103: case IPPROTO_UDP:
1104: case IPPROTO_TCP:
1105: case IPPROTO_ICMPV6:
1106: default:
1107: /*
1108: * stop search if we encounter an upper
1109: * layer protocol headers.
1110: */
1111: goto loopend;
1112:
1113: case IPPROTO_HOPOPTS:
1114: case IPPROTO_AH: /* is it possible? */
1115: break;
1116: }
1117:
1118: /* proceed with the next header. */
1.9 itojun 1119: off += elen;
1.2 itojun 1120: nxt = ip6e->ip6e_nxt;
1121: }
1122: loopend:
1123: }
1.9 itojun 1124: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1125: /* to be done */
1126: }
1.9 itojun 1127: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1128: /* to be done */
1129: }
1130: /* IN6P_RTHDR - to be done */
1131:
1132: }
1133:
1134: /*
1135: * Get pointer to the previous header followed by the header
1136: * currently processed.
1137: * XXX: This function supposes that
1138: * M includes all headers,
1139: * the next header field and the header length field of each header
1140: * are valid, and
1141: * the sum of each header length equals to OFF.
1142: * Because of these assumptions, this function must be called very
1143: * carefully. Moreover, it will not be used in the near future when
1144: * we develop `neater' mechanism to process extension headers.
1145: */
1146: char *
1147: ip6_get_prevhdr(m, off)
1148: struct mbuf *m;
1149: int off;
1150: {
1151: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1152:
1153: if (off == sizeof(struct ip6_hdr))
1154: return(&ip6->ip6_nxt);
1155: else {
1156: int len, nxt;
1157: struct ip6_ext *ip6e = NULL;
1158:
1159: nxt = ip6->ip6_nxt;
1160: len = sizeof(struct ip6_hdr);
1161: while (len < off) {
1162: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1163:
1164: switch(nxt) {
1165: case IPPROTO_FRAGMENT:
1166: len += sizeof(struct ip6_frag);
1167: break;
1168: case IPPROTO_AH:
1169: len += (ip6e->ip6e_len + 2) << 2;
1170: break;
1171: default:
1172: len += (ip6e->ip6e_len + 1) << 3;
1173: break;
1174: }
1175: nxt = ip6e->ip6e_nxt;
1176: }
1177: if (ip6e)
1178: return(&ip6e->ip6e_nxt);
1179: else
1180: return NULL;
1.18 itojun 1181: }
1182: }
1183:
1184: /*
1185: * get next header offset. m will be retained.
1186: */
1187: int
1188: ip6_nexthdr(m, off, proto, nxtp)
1189: struct mbuf *m;
1190: int off;
1191: int proto;
1192: int *nxtp;
1193: {
1194: struct ip6_hdr ip6;
1195: struct ip6_ext ip6e;
1196: struct ip6_frag fh;
1197:
1198: /* just in case */
1199: if (m == NULL)
1200: panic("ip6_nexthdr: m == NULL");
1201: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1202: return -1;
1203:
1204: switch (proto) {
1205: case IPPROTO_IPV6:
1206: if (m->m_pkthdr.len < off + sizeof(ip6))
1207: return -1;
1208: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1209: if (nxtp)
1210: *nxtp = ip6.ip6_nxt;
1211: off += sizeof(ip6);
1212: return off;
1213:
1214: case IPPROTO_FRAGMENT:
1215: /*
1216: * terminate parsing if it is not the first fragment,
1217: * it does not make sense to parse through it.
1218: */
1219: if (m->m_pkthdr.len < off + sizeof(fh))
1220: return -1;
1221: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1222: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1223: return -1;
1224: if (nxtp)
1225: *nxtp = fh.ip6f_nxt;
1226: off += sizeof(struct ip6_frag);
1227: return off;
1228:
1229: case IPPROTO_AH:
1230: if (m->m_pkthdr.len < off + sizeof(ip6e))
1231: return -1;
1232: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1233: if (nxtp)
1234: *nxtp = ip6e.ip6e_nxt;
1235: off += (ip6e.ip6e_len + 2) << 2;
1236: return off;
1237:
1238: case IPPROTO_HOPOPTS:
1239: case IPPROTO_ROUTING:
1240: case IPPROTO_DSTOPTS:
1241: if (m->m_pkthdr.len < off + sizeof(ip6e))
1242: return -1;
1243: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1244: if (nxtp)
1245: *nxtp = ip6e.ip6e_nxt;
1246: off += (ip6e.ip6e_len + 1) << 3;
1247: return off;
1248:
1249: case IPPROTO_NONE:
1250: case IPPROTO_ESP:
1251: case IPPROTO_IPCOMP:
1252: /* give up */
1253: return -1;
1254:
1255: default:
1256: return -1;
1257: }
1258:
1259: return -1;
1260: }
1261:
1262: /*
1263: * get offset for the last header in the chain. m will be kept untainted.
1264: */
1265: int
1266: ip6_lasthdr(m, off, proto, nxtp)
1267: struct mbuf *m;
1268: int off;
1269: int proto;
1270: int *nxtp;
1271: {
1272: int newoff;
1273: int nxt;
1274:
1275: if (!nxtp) {
1276: nxt = -1;
1277: nxtp = &nxt;
1278: }
1279: while (1) {
1280: newoff = ip6_nexthdr(m, off, proto, nxtp);
1281: if (newoff < 0)
1282: return off;
1283: else if (newoff < off)
1284: return -1; /* invalid */
1285: else if (newoff == off)
1286: return newoff;
1287:
1288: off = newoff;
1289: proto = *nxtp;
1.2 itojun 1290: }
1291: }
1292:
1293: /*
1294: * System control for IP6
1295: */
1296:
1297: u_char inet6ctlerrmap[PRC_NCMDS] = {
1298: 0, 0, 0, 0,
1299: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1300: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1301: EMSGSIZE, EHOSTUNREACH, 0, 0,
1302: 0, 0, 0, 0,
1303: ENOPROTOOPT
1304: };
1305:
1306: #include <vm/vm.h>
1307: #include <sys/sysctl.h>
1308:
1309: int
1310: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1311: int *name;
1312: u_int namelen;
1313: void *oldp;
1314: size_t *oldlenp;
1315: void *newp;
1316: size_t newlen;
1317: {
1318: /* All sysctl names at this level are terminal. */
1319: if (namelen != 1)
1320: return ENOTDIR;
1321:
1322: switch (name[0]) {
1323:
1324: case IPV6CTL_FORWARDING:
1325: return sysctl_int(oldp, oldlenp, newp, newlen,
1326: &ip6_forwarding);
1327: case IPV6CTL_SENDREDIRECTS:
1328: return sysctl_int(oldp, oldlenp, newp, newlen,
1329: &ip6_sendredirects);
1330: case IPV6CTL_DEFHLIM:
1331: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1332: case IPV6CTL_MAXFRAGPACKETS:
1333: return sysctl_int(oldp, oldlenp, newp, newlen,
1334: &ip6_maxfragpackets);
1335: case IPV6CTL_ACCEPT_RTADV:
1336: return sysctl_int(oldp, oldlenp, newp, newlen,
1337: &ip6_accept_rtadv);
1338: case IPV6CTL_KEEPFAITH:
1339: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1340: case IPV6CTL_LOG_INTERVAL:
1341: return sysctl_int(oldp, oldlenp, newp, newlen,
1342: &ip6_log_interval);
1343: case IPV6CTL_HDRNESTLIMIT:
1344: return sysctl_int(oldp, oldlenp, newp, newlen,
1345: &ip6_hdrnestlimit);
1346: case IPV6CTL_DAD_COUNT:
1347: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1348: case IPV6CTL_AUTO_FLOWLABEL:
1349: return sysctl_int(oldp, oldlenp, newp, newlen,
1350: &ip6_auto_flowlabel);
1351: case IPV6CTL_DEFMCASTHLIM:
1352: return sysctl_int(oldp, oldlenp, newp, newlen,
1353: &ip6_defmcasthlim);
1354: case IPV6CTL_GIF_HLIM:
1355: return sysctl_int(oldp, oldlenp, newp, newlen,
1356: &ip6_gif_hlim);
1357: case IPV6CTL_KAME_VERSION:
1358: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1359: case IPV6CTL_USE_DEPRECATED:
1360: return sysctl_int(oldp, oldlenp, newp, newlen,
1361: &ip6_use_deprecated);
1.10 itojun 1362: case IPV6CTL_RR_PRUNE:
1363: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1364: #ifndef INET6_BINDV6ONLY
1.11 itojun 1365: case IPV6CTL_BINDV6ONLY:
1366: return sysctl_int(oldp, oldlenp, newp, newlen,
1367: &ip6_bindv6only);
1368: #endif
1.2 itojun 1369: default:
1370: return EOPNOTSUPP;
1371: }
1372: /* NOTREACHED */
1373: }
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