Annotation of src/sys/netinet6/ip6_input.c, Revision 1.21
1.21 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.20 2000/04/12 10:36:45 itojun Exp $ */
! 2: /* $KAME: ip6_input.c,v 1.89 2000/05/19 19:59:05 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.21 ! itojun 7: *
1.2 itojun 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.
1.21 ! itojun 19: *
1.2 itojun 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:
149: /*
150: * IP6 initialization: fill in IP6 protocol switch table.
151: * All protocols not implemented in kernel go to raw IP6 protocol handler.
152: */
153: void
154: ip6_init()
155: {
156: register struct ip6protosw *pr;
157: register int i;
158: struct timeval tv;
159:
160: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
161: if (pr == 0)
162: panic("ip6_init");
163: for (i = 0; i < IPPROTO_MAX; i++)
164: ip6_protox[i] = pr - inet6sw;
165: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
166: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
167: if (pr->pr_domain->dom_family == PF_INET6 &&
168: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
169: ip6_protox[pr->pr_protocol] = pr - inet6sw;
170: ip6intrq.ifq_maxlen = ip6qmaxlen;
171: nd6_init();
172: frag6_init();
1.9 itojun 173: #ifdef IPV6FIREWALL
174: ip6_fw_init();
175: #endif
1.2 itojun 176: /*
177: * in many cases, random() here does NOT return random number
178: * as initialization during bootstrap time occur in fixed order.
179: */
180: microtime(&tv);
181: ip6_flow_seq = random() ^ tv.tv_usec;
182:
183: ip6_init2((void *)0);
184: }
185:
186: static void
187: ip6_init2(dummy)
188: void *dummy;
189: {
190: /*
191: * to route local address of p2p link to loopback,
1.21 ! itojun 192: * assign loopback address first.
1.2 itojun 193: */
1.20 itojun 194: in6_ifattach(&loif[0], NULL);
1.2 itojun 195:
196: /* nd6_timer_init */
1.19 thorpej 197: callout_init(&nd6_timer_ch);
198: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 199: /* router renumbering prefix list maintenance */
1.19 thorpej 200: callout_init(&in6_rr_timer_ch);
201: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 202: }
203:
204: /*
205: * IP6 input interrupt handling. Just pass the packet to ip6_input.
206: */
207: void
208: ip6intr()
209: {
210: int s;
211: struct mbuf *m;
212:
213: for (;;) {
214: s = splimp();
215: IF_DEQUEUE(&ip6intrq, m);
216: splx(s);
217: if (m == 0)
218: return;
219: ip6_input(m);
220: }
221: }
222:
223: extern struct route_in6 ip6_forward_rt;
224:
225: void
226: ip6_input(m)
227: struct mbuf *m;
228: {
1.9 itojun 229: struct ip6_hdr *ip6;
1.2 itojun 230: int off = sizeof(struct ip6_hdr), nest;
231: u_int32_t plen;
1.5 itojun 232: u_int32_t rtalert = ~0;
1.2 itojun 233: int nxt, ours = 0;
1.9 itojun 234: struct ifnet *deliverifp = NULL;
1.15 darrenr 235: #ifdef PFIL_HOOKS
236: struct packet_filter_hook *pfh;
237: struct mbuf *m0;
238: int rv;
239: #endif /* PFIL_HOOKS */
1.2 itojun 240:
241: #ifdef IPSEC
242: /*
243: * should the inner packet be considered authentic?
244: * see comment in ah4_input().
245: */
246: if (m) {
247: m->m_flags &= ~M_AUTHIPHDR;
248: m->m_flags &= ~M_AUTHIPDGM;
249: }
250: #endif
1.9 itojun 251:
1.2 itojun 252: /*
253: * mbuf statistics by kazu
254: */
255: if (m->m_flags & M_EXT) {
256: if (m->m_next)
257: ip6stat.ip6s_mext2m++;
258: else
259: ip6stat.ip6s_mext1++;
260: } else {
261: if (m->m_next) {
1.9 itojun 262: if (m->m_flags & M_LOOP) {
1.2 itojun 263: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.9 itojun 264: }
1.2 itojun 265: else if (m->m_pkthdr.rcvif->if_index <= 31)
266: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
267: else
268: ip6stat.ip6s_m2m[0]++;
269: } else
270: ip6stat.ip6s_m1++;
271: }
272:
1.9 itojun 273: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
274: ip6stat.ip6s_total++;
275:
276: #ifndef PULLDOWN_TEST
277: /* XXX is the line really necessary? */
1.2 itojun 278: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 279: #endif
1.2 itojun 280:
1.9 itojun 281: if (m->m_len < sizeof(struct ip6_hdr)) {
282: struct ifnet *inifp;
283: inifp = m->m_pkthdr.rcvif;
284: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
285: ip6stat.ip6s_toosmall++;
286: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
287: return;
288: }
1.2 itojun 289: }
290:
291: ip6 = mtod(m, struct ip6_hdr *);
292:
293: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
294: ip6stat.ip6s_badvers++;
1.9 itojun 295: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 296: goto bad;
297: }
1.15 darrenr 298:
299: #ifdef PFIL_HOOKS
300: /*
301: * Run through list of hooks for input packets. If there are any
302: * filters which require that additional packets in the flow are
303: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
304: * Note that filters must _never_ set this flag, as another filter
305: * in the list may have previously cleared it.
306: */
307: m0 = m;
1.16 darrenr 308: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15 darrenr 309: for (; pfh; pfh = pfh->pfil_link.tqe_next)
310: if (pfh->pfil_func) {
311: rv = pfh->pfil_func(ip6, sizeof(*ip6),
312: m->m_pkthdr.rcvif, 0, &m0);
313: if (rv)
314: return;
315: m = m0;
316: if (m == NULL)
317: return;
318: ip6 = mtod(m, struct ip6_hdr *);
319: }
320: #endif /* PFIL_HOOKS */
321:
1.2 itojun 322:
323: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
324:
1.9 itojun 325: #ifdef IPV6FIREWALL
326: /*
327: * Check with the firewall...
328: */
329: if (ip6_fw_chk_ptr) {
330: u_short port = 0;
331: /* If ipfw says divert, we have to just drop packet */
332: /* use port as a dummy argument */
333: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
334: m_freem(m);
335: m = NULL;
336: }
337: if (!m)
338: return;
339: }
340: #endif
341:
1.2 itojun 342: /*
343: * Scope check
344: */
345: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
346: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
347: ip6stat.ip6s_badscope++;
1.9 itojun 348: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 349: goto bad;
350: }
1.13 itojun 351: /*
352: * The following check is not documented in the spec. Malicious party
353: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
354: * bypass security checks (act as if it was from 127.0.0.1 by using
355: * IPv6 src ::ffff:127.0.0.1). Be cautious.
356: */
357: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
358: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
359: ip6stat.ip6s_badscope++;
360: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
361: goto bad;
362: }
1.17 itojun 363: #if 0
1.13 itojun 364: /*
1.17 itojun 365: * Reject packets with IPv4 compatible addresses (auto tunnel).
366: *
367: * The code forbids auto tunnel relay case in RFC1933 (the check is
368: * stronger than RFC1933). We may want to re-enable it if mech-xx
369: * is revised to forbid relaying case.
1.13 itojun 370: */
371: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
372: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
373: ip6stat.ip6s_badscope++;
374: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
375: goto bad;
376: }
377: #endif
1.2 itojun 378: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
379: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
380: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
381: ours = 1;
1.9 itojun 382: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 383: goto hbhcheck;
384: } else {
385: ip6stat.ip6s_badscope++;
1.9 itojun 386: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 387: goto bad;
388: }
389: }
390:
1.21 ! itojun 391: #ifndef FAKE_LOOPBACK_IF
! 392: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
! 393: #else
! 394: if (1)
! 395: #endif
! 396: {
1.2 itojun 397: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
398: ip6->ip6_src.s6_addr16[1]
399: = htons(m->m_pkthdr.rcvif->if_index);
400: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
401: ip6->ip6_dst.s6_addr16[1]
402: = htons(m->m_pkthdr.rcvif->if_index);
403: }
404:
1.9 itojun 405: /*
1.21 ! itojun 406: * XXX we need this since we do not have "goto ours" hack route
! 407: * for some of our ifaddrs on loopback interface.
! 408: * we should correct it by changing in6_ifattach to install
! 409: * "goto ours" hack route.
1.9 itojun 410: */
1.21 ! itojun 411: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
! 412: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
! 413: ours = 1;
! 414: deliverifp = m->m_pkthdr.rcvif;
! 415: goto hbhcheck;
! 416: }
1.9 itojun 417: }
418:
1.2 itojun 419: /*
420: * Multicast check
421: */
422: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
423: struct in6_multi *in6m = 0;
1.9 itojun 424:
425: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 426: /*
427: * See if we belong to the destination multicast group on the
428: * arrival interface.
429: */
430: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
431: if (in6m)
432: ours = 1;
433: else if (!ip6_mrouter) {
434: ip6stat.ip6s_notmember++;
435: ip6stat.ip6s_cantforward++;
1.9 itojun 436: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 437: goto bad;
438: }
1.9 itojun 439: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 440: goto hbhcheck;
441: }
442:
443: /*
444: * Unicast check
445: */
446: if (ip6_forward_rt.ro_rt == 0 ||
447: !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
448: &ip6_forward_rt.ro_dst.sin6_addr)) {
449: if (ip6_forward_rt.ro_rt) {
450: RTFREE(ip6_forward_rt.ro_rt);
451: ip6_forward_rt.ro_rt = 0;
452: }
453: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
454: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
455: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
456: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
457:
1.9 itojun 458: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 459: }
460:
461: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
462:
463: /*
464: * Accept the packet if the forwarding interface to the destination
465: * according to the routing table is the loopback interface,
466: * unless the associated route has a gateway.
467: * Note that this approach causes to accept a packet if there is a
468: * route to the loopback interface for the destination of the packet.
469: * But we think it's even useful in some situations, e.g. when using
470: * a special daemon which wants to intercept the packet.
471: */
472: if (ip6_forward_rt.ro_rt &&
473: (ip6_forward_rt.ro_rt->rt_flags &
474: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
475: #if 0
476: /*
477: * The check below is redundant since the comparison of
478: * the destination and the key of the rtentry has
479: * already done through looking up the routing table.
480: */
481: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
482: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
483: #endif
1.9 itojun 484: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 485: struct in6_ifaddr *ia6 =
486: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
487: /* packet to tentative address must not be received */
488: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
489: m->m_flags |= M_ANYCAST6;
490: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
491: /* this interface is ready */
492: ours = 1;
1.9 itojun 493: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 494: goto hbhcheck;
495: } else {
496: /* this interface is not ready, fall through */
497: }
498: }
499:
500: /*
501: * FAITH(Firewall Aided Internet Translator)
502: */
503: #if defined(NFAITH) && 0 < NFAITH
504: if (ip6_keepfaith) {
505: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
506: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
507: /* XXX do we need more sanity checks? */
508: ours = 1;
1.9 itojun 509: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
510: goto hbhcheck;
511: }
512: }
513: #endif
514:
515: #if 0
516: {
517: /*
518: * Last resort: check in6_ifaddr for incoming interface.
519: * The code is here until I update the "goto ours hack" code above
520: * working right.
521: */
522: struct ifaddr *ifa;
523: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
524: ifa;
525: ifa = ifa->ifa_list.tqe_next) {
526: if (ifa->ifa_addr == NULL)
527: continue; /* just for safety */
528: if (ifa->ifa_addr->sa_family != AF_INET6)
529: continue;
530: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
531: ours = 1;
532: deliverifp = ifa->ifa_ifp;
1.2 itojun 533: goto hbhcheck;
534: }
535: }
1.9 itojun 536: }
1.2 itojun 537: #endif
538:
539: /*
540: * Now there is no reason to process the packet if it's not our own
541: * and we're not a router.
542: */
543: if (!ip6_forwarding) {
544: ip6stat.ip6s_cantforward++;
1.9 itojun 545: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 546: goto bad;
547: }
548:
549: hbhcheck:
550: /*
551: * Process Hop-by-Hop options header if it's contained.
552: * m may be modified in ip6_hopopts_input().
553: * If a JumboPayload option is included, plen will also be modified.
554: */
555: plen = (u_int32_t)ntohs(ip6->ip6_plen);
556: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 557: struct ip6_hbh *hbh;
558:
559: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
560: #if 0 /*touches NULL pointer*/
561: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
562: #endif
1.2 itojun 563: return; /* m have already been freed */
1.9 itojun 564: }
1.2 itojun 565: /* adjust pointer */
566: ip6 = mtod(m, struct ip6_hdr *);
1.9 itojun 567: #ifndef PULLDOWN_TEST
568: /* ip6_hopopts_input() ensures that mbuf is contiguous */
569: hbh = (struct ip6_hbh *)(ip6 + 1);
570: #else
571: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
572: sizeof(struct ip6_hbh));
573: if (hbh == NULL) {
574: ip6stat.ip6s_tooshort++;
575: return;
576: }
577: #endif
578: nxt = hbh->ip6h_nxt;
1.2 itojun 579:
580: /*
581: * accept the packet if a router alert option is included
582: * and we act as an IPv6 router.
583: */
1.5 itojun 584: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 585: ours = 1;
586: } else
587: nxt = ip6->ip6_nxt;
588:
589: /*
590: * Check that the amount of data in the buffers
591: * is as at least much as the IPv6 header would have us expect.
592: * Trim mbufs if longer than we expect.
593: * Drop packet if shorter than we expect.
594: */
595: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
596: ip6stat.ip6s_tooshort++;
1.9 itojun 597: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 598: goto bad;
599: }
600: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
601: if (m->m_len == m->m_pkthdr.len) {
602: m->m_len = sizeof(struct ip6_hdr) + plen;
603: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
604: } else
605: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
606: }
607:
608: /*
609: * Forward if desirable.
610: */
611: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
612: /*
613: * If we are acting as a multicast router, all
614: * incoming multicast packets are passed to the
615: * kernel-level multicast forwarding function.
616: * The packet is returned (relatively) intact; if
617: * ip6_mforward() returns a non-zero value, the packet
618: * must be discarded, else it may be accepted below.
619: */
620: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
621: ip6stat.ip6s_cantforward++;
622: m_freem(m);
623: return;
624: }
625: if (!ours) {
626: m_freem(m);
627: return;
628: }
629: }
630: else if (!ours) {
631: ip6_forward(m, 0);
632: return;
633: }
634:
635: /*
636: * Tell launch routine the next header
637: */
1.12 itojun 638: #ifdef IFA_STATS
1.9 itojun 639: if (IFA_STATS && deliverifp != NULL) {
640: struct in6_ifaddr *ia6;
641: ip6 = mtod(m, struct ip6_hdr *);
642: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
643: if (ia6)
644: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
645: }
646: #endif
1.2 itojun 647: ip6stat.ip6s_delivered++;
1.9 itojun 648: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 649: nest = 0;
650: while (nxt != IPPROTO_DONE) {
651: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
652: ip6stat.ip6s_toomanyhdr++;
653: goto bad;
654: }
1.8 itojun 655:
656: /*
657: * protection against faulty packet - there should be
658: * more sanity checks in header chain processing.
659: */
660: if (m->m_pkthdr.len < off) {
661: ip6stat.ip6s_tooshort++;
1.9 itojun 662: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 663: goto bad;
664: }
665:
1.2 itojun 666: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
667: }
668: return;
669: bad:
670: m_freem(m);
671: }
672:
673: /*
674: * Hop-by-Hop options header processing. If a valid jumbo payload option is
675: * included, the real payload length will be stored in plenp.
676: */
677: static int
678: ip6_hopopts_input(plenp, rtalertp, mp, offp)
679: u_int32_t *plenp;
1.5 itojun 680: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 681: struct mbuf **mp;
682: int *offp;
683: {
684: register struct mbuf *m = *mp;
685: int off = *offp, hbhlen;
686: struct ip6_hbh *hbh;
687: u_int8_t *opt;
688:
689: /* validation of the length of the header */
1.9 itojun 690: #ifndef PULLDOWN_TEST
1.2 itojun 691: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
692: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
693: hbhlen = (hbh->ip6h_len + 1) << 3;
694:
695: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
696: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 697: #else
698: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
699: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
700: if (hbh == NULL) {
701: ip6stat.ip6s_tooshort++;
702: return -1;
703: }
704: hbhlen = (hbh->ip6h_len + 1) << 3;
705: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
706: hbhlen);
707: if (hbh == NULL) {
708: ip6stat.ip6s_tooshort++;
709: return -1;
710: }
711: #endif
1.2 itojun 712: off += hbhlen;
713: hbhlen -= sizeof(struct ip6_hbh);
714: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
715:
716: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
717: hbhlen, rtalertp, plenp) < 0)
718: return(-1);
719:
720: *offp = off;
721: *mp = m;
722: return(0);
723: }
724:
725: /*
726: * Search header for all Hop-by-hop options and process each option.
727: * This function is separate from ip6_hopopts_input() in order to
728: * handle a case where the sending node itself process its hop-by-hop
729: * options header. In such a case, the function is called from ip6_output().
730: */
731: int
732: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
733: struct mbuf *m;
734: u_int8_t *opthead;
735: int hbhlen;
1.5 itojun 736: u_int32_t *rtalertp;
1.2 itojun 737: u_int32_t *plenp;
738: {
739: struct ip6_hdr *ip6;
740: int optlen = 0;
741: u_int8_t *opt = opthead;
742: u_int16_t rtalert_val;
743:
744: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
745: switch(*opt) {
746: case IP6OPT_PAD1:
747: optlen = 1;
748: break;
749: case IP6OPT_PADN:
750: if (hbhlen < IP6OPT_MINLEN) {
751: ip6stat.ip6s_toosmall++;
752: goto bad;
753: }
754: optlen = *(opt + 1) + 2;
755: break;
756: case IP6OPT_RTALERT:
1.8 itojun 757: /* XXX may need check for alignment */
1.2 itojun 758: if (hbhlen < IP6OPT_RTALERT_LEN) {
759: ip6stat.ip6s_toosmall++;
760: goto bad;
761: }
762: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
763: /* XXX: should we discard the packet? */
764: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
765: *(opt + 1));
766: optlen = IP6OPT_RTALERT_LEN;
767: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
768: *rtalertp = ntohs(rtalert_val);
769: break;
770: case IP6OPT_JUMBO:
1.8 itojun 771: /* XXX may need check for alignment */
1.2 itojun 772: if (hbhlen < IP6OPT_JUMBO_LEN) {
773: ip6stat.ip6s_toosmall++;
774: goto bad;
775: }
776: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
777: /* XXX: should we discard the packet? */
778: log(LOG_ERR, "length of jumbopayload opt "
779: "is inconsistent(%d)",
780: *(opt + 1));
781: optlen = IP6OPT_JUMBO_LEN;
782:
783: /*
784: * We can simply cast because of the alignment
785: * requirement of the jumbo payload option.
786: */
1.8 itojun 787: #if 0
1.2 itojun 788: *plenp = ntohl(*(u_int32_t *)(opt + 2));
1.8 itojun 789: #else
790: bcopy(opt + 2, plenp, sizeof(*plenp));
791: *plenp = htonl(*plenp);
792: #endif
1.2 itojun 793: if (*plenp <= IPV6_MAXPACKET) {
794: /*
795: * jumbo payload length must be larger
796: * than 65535
797: */
798: ip6stat.ip6s_badoptions++;
799: icmp6_error(m, ICMP6_PARAM_PROB,
800: ICMP6_PARAMPROB_HEADER,
801: sizeof(struct ip6_hdr) +
802: sizeof(struct ip6_hbh) +
803: opt + 2 - opthead);
804: return(-1);
805: }
806:
807: ip6 = mtod(m, struct ip6_hdr *);
808: if (ip6->ip6_plen) {
809: /*
810: * IPv6 packets that have non 0 payload length
811: * must not contain a jumbo paylod option.
812: */
813: ip6stat.ip6s_badoptions++;
814: icmp6_error(m, ICMP6_PARAM_PROB,
815: ICMP6_PARAMPROB_HEADER,
816: sizeof(struct ip6_hdr) +
817: sizeof(struct ip6_hbh) +
818: opt - opthead);
819: return(-1);
820: }
821: break;
822: default: /* unknown option */
823: if (hbhlen < IP6OPT_MINLEN) {
824: ip6stat.ip6s_toosmall++;
825: goto bad;
826: }
827: if ((optlen = ip6_unknown_opt(opt, m,
828: sizeof(struct ip6_hdr) +
829: sizeof(struct ip6_hbh) +
830: opt - opthead)) == -1)
831: return(-1);
832: optlen += 2;
833: break;
834: }
835: }
836:
837: return(0);
838:
839: bad:
840: m_freem(m);
841: return(-1);
842: }
843:
844: /*
845: * Unknown option processing.
846: * The third argument `off' is the offset from the IPv6 header to the option,
847: * which is necessary if the IPv6 header the and option header and IPv6 header
848: * is not continuous in order to return an ICMPv6 error.
849: */
850: int
851: ip6_unknown_opt(optp, m, off)
852: u_int8_t *optp;
853: struct mbuf *m;
854: int off;
855: {
856: struct ip6_hdr *ip6;
857:
858: switch(IP6OPT_TYPE(*optp)) {
859: case IP6OPT_TYPE_SKIP: /* ignore the option */
860: return((int)*(optp + 1));
861: case IP6OPT_TYPE_DISCARD: /* silently discard */
862: m_freem(m);
863: return(-1);
864: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
865: ip6stat.ip6s_badoptions++;
866: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
867: return(-1);
868: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
869: ip6stat.ip6s_badoptions++;
870: ip6 = mtod(m, struct ip6_hdr *);
871: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
872: (m->m_flags & (M_BCAST|M_MCAST)))
873: m_freem(m);
874: else
875: icmp6_error(m, ICMP6_PARAM_PROB,
876: ICMP6_PARAMPROB_OPTION, off);
877: return(-1);
878: }
879:
880: m_freem(m); /* XXX: NOTREACHED */
881: return(-1);
882: }
883:
884: /*
1.9 itojun 885: * Create the "control" list for this pcb.
886: *
887: * The routine will be called from upper layer handlers like tcp6_input().
888: * Thus the routine assumes that the caller (tcp6_input) have already
889: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
890: * very first mbuf on the mbuf chain.
891: * We may want to add some infinite loop prevention or sanity checks for safety.
892: * (This applies only when you are using KAME mbuf chain restriction, i.e.
893: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 894: */
895: void
896: ip6_savecontrol(in6p, mp, ip6, m)
897: register struct in6pcb *in6p;
898: register struct mbuf **mp;
899: register struct ip6_hdr *ip6;
900: register struct mbuf *m;
901: {
902: struct proc *p = curproc; /* XXX */
1.9 itojun 903: int privileged;
1.2 itojun 904:
1.9 itojun 905: privileged = 0;
906: if (p && !suser(p->p_ucred, &p->p_acflag))
907: privileged++;
908:
909: #ifdef SO_TIMESTAMP
1.2 itojun 910: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
911: struct timeval tv;
912:
913: microtime(&tv);
914: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
915: SCM_TIMESTAMP, SOL_SOCKET);
916: if (*mp)
917: mp = &(*mp)->m_next;
918: }
1.9 itojun 919: #endif
1.2 itojun 920: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
921: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
922: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
923: IPPROTO_IPV6);
924: if (*mp)
925: mp = &(*mp)->m_next;
926: }
927:
928: #ifdef noyet
929: /* options were tossed above */
930: if (in6p->in6p_flags & IN6P_RECVOPTS)
931: /* broken */
932: /* ip6_srcroute doesn't do what we want here, need to fix */
933: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
934: /* broken */
935: #endif
936:
937: /* RFC 2292 sec. 5 */
938: if (in6p->in6p_flags & IN6P_PKTINFO) {
939: struct in6_pktinfo pi6;
940: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
941: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
942: pi6.ipi6_addr.s6_addr16[1] = 0;
943: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
944: ? m->m_pkthdr.rcvif->if_index
945: : 0;
946: *mp = sbcreatecontrol((caddr_t) &pi6,
947: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
948: IPPROTO_IPV6);
949: if (*mp)
950: mp = &(*mp)->m_next;
951: }
952: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
953: int hlim = ip6->ip6_hlim & 0xff;
954: *mp = sbcreatecontrol((caddr_t) &hlim,
955: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
956: if (*mp)
957: mp = &(*mp)->m_next;
958: }
959: /* IN6P_NEXTHOP - for outgoing packet only */
960:
961: /*
962: * IPV6_HOPOPTS socket option. We require super-user privilege
963: * for the option, but it might be too strict, since there might
964: * be some hop-by-hop options which can be returned to normal user.
965: * See RFC 2292 section 6.
966: */
1.9 itojun 967: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 968: /*
969: * Check if a hop-by-hop options header is contatined in the
970: * received packet, and if so, store the options as ancillary
971: * data. Note that a hop-by-hop options header must be
972: * just after the IPv6 header, which fact is assured through
973: * the IPv6 input processing.
974: */
975: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
976: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 977: struct ip6_hbh *hbh;
978: int hbhlen;
979:
980: #ifndef PULLDOWN_TEST
981: hbh = (struct ip6_hbh *)(ip6 + 1);
982: hbhlen = (hbh->ip6h_len + 1) << 3;
983: #else
984: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
985: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
986: if (hbh == NULL) {
987: ip6stat.ip6s_tooshort++;
988: return;
989: }
990: hbhlen = (hbh->ip6h_len + 1) << 3;
991: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
992: sizeof(struct ip6_hdr), hbhlen);
993: if (hbh == NULL) {
994: ip6stat.ip6s_tooshort++;
995: return;
996: }
997: #endif
1.2 itojun 998:
999: /*
1000: * XXX: We copy whole the header even if a jumbo
1001: * payload option is included, which option is to
1002: * be removed before returning in the RFC 2292.
1003: * But it's too painful operation...
1004: */
1.9 itojun 1005: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1006: IPV6_HOPOPTS, IPPROTO_IPV6);
1007: if (*mp)
1008: mp = &(*mp)->m_next;
1009: }
1010: }
1011:
1012: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1013: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1014: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1015: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1016:
1017: /*
1018: * Search for destination options headers or routing
1019: * header(s) through the header chain, and stores each
1020: * header as ancillary data.
1021: * Note that the order of the headers remains in
1022: * the chain of ancillary data.
1023: */
1024: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1025: struct ip6_ext *ip6e;
1026: int elen;
1027:
1028: #ifndef PULLDOWN_TEST
1029: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1030: if (nxt == IPPROTO_AH)
1031: elen = (ip6e->ip6e_len + 2) << 2;
1032: else
1033: elen = (ip6e->ip6e_len + 1) << 3;
1034: #else
1035: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1036: sizeof(struct ip6_ext));
1037: if (ip6e == NULL) {
1038: ip6stat.ip6s_tooshort++;
1039: return;
1040: }
1041: if (nxt == IPPROTO_AH)
1042: elen = (ip6e->ip6e_len + 2) << 2;
1043: else
1044: elen = (ip6e->ip6e_len + 1) << 3;
1045: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1046: if (ip6e == NULL) {
1047: ip6stat.ip6s_tooshort++;
1048: return;
1049: }
1050: #endif
1.2 itojun 1051:
1052: switch(nxt) {
1053: case IPPROTO_DSTOPTS:
1054: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1055: break;
1056:
1057: /*
1058: * We also require super-user privilege for
1059: * the option.
1060: * See the comments on IN6_HOPOPTS.
1061: */
1.9 itojun 1062: if (!privileged)
1.2 itojun 1063: break;
1064:
1.9 itojun 1065: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1066: IPV6_DSTOPTS,
1067: IPPROTO_IPV6);
1068: if (*mp)
1069: mp = &(*mp)->m_next;
1070: break;
1071:
1072: case IPPROTO_ROUTING:
1073: if (!in6p->in6p_flags & IN6P_RTHDR)
1074: break;
1075:
1.9 itojun 1076: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1077: IPV6_RTHDR,
1078: IPPROTO_IPV6);
1079: if (*mp)
1080: mp = &(*mp)->m_next;
1081: break;
1082:
1083: case IPPROTO_UDP:
1084: case IPPROTO_TCP:
1085: case IPPROTO_ICMPV6:
1086: default:
1087: /*
1088: * stop search if we encounter an upper
1089: * layer protocol headers.
1090: */
1091: goto loopend;
1092:
1093: case IPPROTO_HOPOPTS:
1094: case IPPROTO_AH: /* is it possible? */
1095: break;
1096: }
1097:
1098: /* proceed with the next header. */
1.9 itojun 1099: off += elen;
1.2 itojun 1100: nxt = ip6e->ip6e_nxt;
1101: }
1102: loopend:
1103: }
1.9 itojun 1104: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1105: /* to be done */
1106: }
1.9 itojun 1107: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1108: /* to be done */
1109: }
1110: /* IN6P_RTHDR - to be done */
1111:
1112: }
1113:
1114: /*
1115: * Get pointer to the previous header followed by the header
1116: * currently processed.
1117: * XXX: This function supposes that
1118: * M includes all headers,
1119: * the next header field and the header length field of each header
1120: * are valid, and
1121: * the sum of each header length equals to OFF.
1122: * Because of these assumptions, this function must be called very
1123: * carefully. Moreover, it will not be used in the near future when
1124: * we develop `neater' mechanism to process extension headers.
1125: */
1126: char *
1127: ip6_get_prevhdr(m, off)
1128: struct mbuf *m;
1129: int off;
1130: {
1131: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1132:
1133: if (off == sizeof(struct ip6_hdr))
1134: return(&ip6->ip6_nxt);
1135: else {
1136: int len, nxt;
1137: struct ip6_ext *ip6e = NULL;
1138:
1139: nxt = ip6->ip6_nxt;
1140: len = sizeof(struct ip6_hdr);
1141: while (len < off) {
1142: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1143:
1144: switch(nxt) {
1145: case IPPROTO_FRAGMENT:
1146: len += sizeof(struct ip6_frag);
1147: break;
1148: case IPPROTO_AH:
1149: len += (ip6e->ip6e_len + 2) << 2;
1150: break;
1151: default:
1152: len += (ip6e->ip6e_len + 1) << 3;
1153: break;
1154: }
1155: nxt = ip6e->ip6e_nxt;
1156: }
1157: if (ip6e)
1158: return(&ip6e->ip6e_nxt);
1159: else
1160: return NULL;
1.18 itojun 1161: }
1162: }
1163:
1164: /*
1165: * get next header offset. m will be retained.
1166: */
1167: int
1168: ip6_nexthdr(m, off, proto, nxtp)
1169: struct mbuf *m;
1170: int off;
1171: int proto;
1172: int *nxtp;
1173: {
1174: struct ip6_hdr ip6;
1175: struct ip6_ext ip6e;
1176: struct ip6_frag fh;
1177:
1178: /* just in case */
1179: if (m == NULL)
1180: panic("ip6_nexthdr: m == NULL");
1181: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1182: return -1;
1183:
1184: switch (proto) {
1185: case IPPROTO_IPV6:
1186: if (m->m_pkthdr.len < off + sizeof(ip6))
1187: return -1;
1188: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1189: if (nxtp)
1190: *nxtp = ip6.ip6_nxt;
1191: off += sizeof(ip6);
1192: return off;
1193:
1194: case IPPROTO_FRAGMENT:
1195: /*
1196: * terminate parsing if it is not the first fragment,
1197: * it does not make sense to parse through it.
1198: */
1199: if (m->m_pkthdr.len < off + sizeof(fh))
1200: return -1;
1201: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1202: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1203: return -1;
1204: if (nxtp)
1205: *nxtp = fh.ip6f_nxt;
1206: off += sizeof(struct ip6_frag);
1207: return off;
1208:
1209: case IPPROTO_AH:
1210: if (m->m_pkthdr.len < off + sizeof(ip6e))
1211: return -1;
1212: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1213: if (nxtp)
1214: *nxtp = ip6e.ip6e_nxt;
1215: off += (ip6e.ip6e_len + 2) << 2;
1216: return off;
1217:
1218: case IPPROTO_HOPOPTS:
1219: case IPPROTO_ROUTING:
1220: case IPPROTO_DSTOPTS:
1221: if (m->m_pkthdr.len < off + sizeof(ip6e))
1222: return -1;
1223: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1224: if (nxtp)
1225: *nxtp = ip6e.ip6e_nxt;
1226: off += (ip6e.ip6e_len + 1) << 3;
1227: return off;
1228:
1229: case IPPROTO_NONE:
1230: case IPPROTO_ESP:
1231: case IPPROTO_IPCOMP:
1232: /* give up */
1233: return -1;
1234:
1235: default:
1236: return -1;
1237: }
1238:
1239: return -1;
1240: }
1241:
1242: /*
1243: * get offset for the last header in the chain. m will be kept untainted.
1244: */
1245: int
1246: ip6_lasthdr(m, off, proto, nxtp)
1247: struct mbuf *m;
1248: int off;
1249: int proto;
1250: int *nxtp;
1251: {
1252: int newoff;
1253: int nxt;
1254:
1255: if (!nxtp) {
1256: nxt = -1;
1257: nxtp = &nxt;
1258: }
1259: while (1) {
1260: newoff = ip6_nexthdr(m, off, proto, nxtp);
1261: if (newoff < 0)
1262: return off;
1263: else if (newoff < off)
1264: return -1; /* invalid */
1265: else if (newoff == off)
1266: return newoff;
1267:
1268: off = newoff;
1269: proto = *nxtp;
1.2 itojun 1270: }
1271: }
1272:
1273: /*
1274: * System control for IP6
1275: */
1276:
1277: u_char inet6ctlerrmap[PRC_NCMDS] = {
1278: 0, 0, 0, 0,
1279: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1280: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1281: EMSGSIZE, EHOSTUNREACH, 0, 0,
1282: 0, 0, 0, 0,
1283: ENOPROTOOPT
1284: };
1285:
1286: #include <vm/vm.h>
1287: #include <sys/sysctl.h>
1288:
1289: int
1290: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1291: int *name;
1292: u_int namelen;
1293: void *oldp;
1294: size_t *oldlenp;
1295: void *newp;
1296: size_t newlen;
1297: {
1298: /* All sysctl names at this level are terminal. */
1299: if (namelen != 1)
1300: return ENOTDIR;
1301:
1302: switch (name[0]) {
1303:
1304: case IPV6CTL_FORWARDING:
1305: return sysctl_int(oldp, oldlenp, newp, newlen,
1306: &ip6_forwarding);
1307: case IPV6CTL_SENDREDIRECTS:
1308: return sysctl_int(oldp, oldlenp, newp, newlen,
1309: &ip6_sendredirects);
1310: case IPV6CTL_DEFHLIM:
1311: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1312: case IPV6CTL_MAXFRAGPACKETS:
1313: return sysctl_int(oldp, oldlenp, newp, newlen,
1314: &ip6_maxfragpackets);
1315: case IPV6CTL_ACCEPT_RTADV:
1316: return sysctl_int(oldp, oldlenp, newp, newlen,
1317: &ip6_accept_rtadv);
1318: case IPV6CTL_KEEPFAITH:
1319: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1320: case IPV6CTL_LOG_INTERVAL:
1321: return sysctl_int(oldp, oldlenp, newp, newlen,
1322: &ip6_log_interval);
1323: case IPV6CTL_HDRNESTLIMIT:
1324: return sysctl_int(oldp, oldlenp, newp, newlen,
1325: &ip6_hdrnestlimit);
1326: case IPV6CTL_DAD_COUNT:
1327: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1328: case IPV6CTL_AUTO_FLOWLABEL:
1329: return sysctl_int(oldp, oldlenp, newp, newlen,
1330: &ip6_auto_flowlabel);
1331: case IPV6CTL_DEFMCASTHLIM:
1332: return sysctl_int(oldp, oldlenp, newp, newlen,
1333: &ip6_defmcasthlim);
1334: case IPV6CTL_GIF_HLIM:
1335: return sysctl_int(oldp, oldlenp, newp, newlen,
1336: &ip6_gif_hlim);
1337: case IPV6CTL_KAME_VERSION:
1338: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1339: case IPV6CTL_USE_DEPRECATED:
1340: return sysctl_int(oldp, oldlenp, newp, newlen,
1341: &ip6_use_deprecated);
1.10 itojun 1342: case IPV6CTL_RR_PRUNE:
1343: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1344: #ifndef INET6_BINDV6ONLY
1.11 itojun 1345: case IPV6CTL_BINDV6ONLY:
1346: return sysctl_int(oldp, oldlenp, newp, newlen,
1347: &ip6_bindv6only);
1348: #endif
1.2 itojun 1349: default:
1350: return EOPNOTSUPP;
1351: }
1352: /* NOTREACHED */
1353: }
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