Annotation of src/sys/netinet6/ip6_input.c, Revision 1.22.2.1
1.22.2.1! thorpej 1: /* $NetBSD: ip6_input.c,v 1.22 2000/06/13 14:43:44 itojun Exp $ */
! 2: /* $KAME: ip6_input.c,v 1.95 2000/07/02 07:49:37 jinmei 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*/
1.22 itojun 264: } else if (m->m_pkthdr.rcvif->if_index <= 31)
1.2 itojun 265: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
266: else
267: ip6stat.ip6s_m2m[0]++;
268: } else
269: ip6stat.ip6s_m1++;
270: }
271:
1.9 itojun 272: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
273: ip6stat.ip6s_total++;
274:
275: #ifndef PULLDOWN_TEST
276: /* XXX is the line really necessary? */
1.2 itojun 277: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 278: #endif
1.2 itojun 279:
1.9 itojun 280: if (m->m_len < sizeof(struct ip6_hdr)) {
281: struct ifnet *inifp;
282: inifp = m->m_pkthdr.rcvif;
283: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
284: ip6stat.ip6s_toosmall++;
285: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
286: return;
287: }
1.2 itojun 288: }
289:
290: ip6 = mtod(m, struct ip6_hdr *);
291:
292: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
293: ip6stat.ip6s_badvers++;
1.9 itojun 294: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 295: goto bad;
296: }
1.15 darrenr 297:
298: #ifdef PFIL_HOOKS
299: /*
300: * Run through list of hooks for input packets. If there are any
301: * filters which require that additional packets in the flow are
302: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
303: * Note that filters must _never_ set this flag, as another filter
304: * in the list may have previously cleared it.
305: */
306: m0 = m;
1.16 darrenr 307: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15 darrenr 308: for (; pfh; pfh = pfh->pfil_link.tqe_next)
309: if (pfh->pfil_func) {
310: rv = pfh->pfil_func(ip6, sizeof(*ip6),
311: m->m_pkthdr.rcvif, 0, &m0);
312: if (rv)
313: return;
314: m = m0;
315: if (m == NULL)
316: return;
317: ip6 = mtod(m, struct ip6_hdr *);
318: }
319: #endif /* PFIL_HOOKS */
320:
1.2 itojun 321:
322: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
323:
1.9 itojun 324: #ifdef IPV6FIREWALL
325: /*
326: * Check with the firewall...
327: */
328: if (ip6_fw_chk_ptr) {
329: u_short port = 0;
330: /* If ipfw says divert, we have to just drop packet */
331: /* use port as a dummy argument */
332: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
333: m_freem(m);
334: m = NULL;
335: }
336: if (!m)
337: return;
338: }
339: #endif
340:
1.2 itojun 341: /*
342: * Scope check
343: */
344: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
345: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
346: ip6stat.ip6s_badscope++;
1.9 itojun 347: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 348: goto bad;
349: }
1.13 itojun 350: /*
351: * The following check is not documented in the spec. Malicious party
352: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
353: * bypass security checks (act as if it was from 127.0.0.1 by using
354: * IPv6 src ::ffff:127.0.0.1). Be cautious.
355: */
356: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
357: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
358: ip6stat.ip6s_badscope++;
359: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
360: goto bad;
361: }
1.17 itojun 362: #if 0
1.13 itojun 363: /*
1.17 itojun 364: * Reject packets with IPv4 compatible addresses (auto tunnel).
365: *
366: * The code forbids auto tunnel relay case in RFC1933 (the check is
367: * stronger than RFC1933). We may want to re-enable it if mech-xx
368: * is revised to forbid relaying case.
1.13 itojun 369: */
370: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
371: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
372: ip6stat.ip6s_badscope++;
373: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
374: goto bad;
375: }
376: #endif
1.2 itojun 377: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
378: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
379: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
380: ours = 1;
1.9 itojun 381: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 382: goto hbhcheck;
383: } else {
384: ip6stat.ip6s_badscope++;
1.9 itojun 385: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 386: goto bad;
387: }
388: }
389:
1.21 itojun 390: #ifndef FAKE_LOOPBACK_IF
391: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
392: #else
393: if (1)
394: #endif
395: {
1.2 itojun 396: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
397: ip6->ip6_src.s6_addr16[1]
398: = htons(m->m_pkthdr.rcvif->if_index);
399: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
400: ip6->ip6_dst.s6_addr16[1]
401: = htons(m->m_pkthdr.rcvif->if_index);
402: }
403:
1.9 itojun 404: /*
1.21 itojun 405: * XXX we need this since we do not have "goto ours" hack route
406: * for some of our ifaddrs on loopback interface.
407: * we should correct it by changing in6_ifattach to install
408: * "goto ours" hack route.
1.9 itojun 409: */
1.21 itojun 410: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
411: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
412: ours = 1;
413: deliverifp = m->m_pkthdr.rcvif;
414: goto hbhcheck;
415: }
1.9 itojun 416: }
417:
1.2 itojun 418: /*
419: * Multicast check
420: */
421: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
422: struct in6_multi *in6m = 0;
1.9 itojun 423:
424: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 425: /*
426: * See if we belong to the destination multicast group on the
427: * arrival interface.
428: */
429: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
430: if (in6m)
431: ours = 1;
432: else if (!ip6_mrouter) {
433: ip6stat.ip6s_notmember++;
434: ip6stat.ip6s_cantforward++;
1.9 itojun 435: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 436: goto bad;
437: }
1.9 itojun 438: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 439: goto hbhcheck;
440: }
441:
442: /*
443: * Unicast check
444: */
1.22 itojun 445: if (ip6_forward_rt.ro_rt != NULL &&
446: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
447: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
448: &ip6_forward_rt.ro_dst.sin6_addr))
449: ; /* cache hit */
450: else {
1.2 itojun 451: if (ip6_forward_rt.ro_rt) {
1.22 itojun 452: /* route is down or destination is different */
1.2 itojun 453: RTFREE(ip6_forward_rt.ro_rt);
454: ip6_forward_rt.ro_rt = 0;
455: }
1.22 itojun 456:
1.2 itojun 457: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
458: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
459: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
460: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
461:
1.9 itojun 462: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 463: }
464:
465: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
466:
467: /*
468: * Accept the packet if the forwarding interface to the destination
469: * according to the routing table is the loopback interface,
470: * unless the associated route has a gateway.
471: * Note that this approach causes to accept a packet if there is a
472: * route to the loopback interface for the destination of the packet.
473: * But we think it's even useful in some situations, e.g. when using
474: * a special daemon which wants to intercept the packet.
475: */
476: if (ip6_forward_rt.ro_rt &&
477: (ip6_forward_rt.ro_rt->rt_flags &
478: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
479: #if 0
480: /*
481: * The check below is redundant since the comparison of
482: * the destination and the key of the rtentry has
483: * already done through looking up the routing table.
484: */
485: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
486: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
487: #endif
1.9 itojun 488: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 489: struct in6_ifaddr *ia6 =
490: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
491: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
492: m->m_flags |= M_ANYCAST6;
1.22.2.1! thorpej 493: /*
! 494: * packets to a tentative, duplicated, or somehow invalid
! 495: * address must not be accepted.
! 496: */
1.2 itojun 497: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.22.2.1! thorpej 498: /* this address is ready */
1.2 itojun 499: ours = 1;
1.9 itojun 500: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 501: goto hbhcheck;
502: } else {
1.22.2.1! thorpej 503: /* address is not ready, so discard the packet. */
! 504: log(LOG_INFO,
! 505: "ip6_input: packet to an unready address %s->%s",
! 506: ip6_sprintf(&ip6->ip6_src),
! 507: ip6_sprintf(&ip6->ip6_dst));
! 508:
! 509: goto bad;
1.2 itojun 510: }
511: }
512:
513: /*
514: * FAITH(Firewall Aided Internet Translator)
515: */
516: #if defined(NFAITH) && 0 < NFAITH
517: if (ip6_keepfaith) {
518: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
519: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
520: /* XXX do we need more sanity checks? */
521: ours = 1;
1.9 itojun 522: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
523: goto hbhcheck;
524: }
525: }
526: #endif
527:
528: #if 0
529: {
530: /*
531: * Last resort: check in6_ifaddr for incoming interface.
532: * The code is here until I update the "goto ours hack" code above
533: * working right.
534: */
535: struct ifaddr *ifa;
536: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
537: ifa;
538: ifa = ifa->ifa_list.tqe_next) {
539: if (ifa->ifa_addr == NULL)
540: continue; /* just for safety */
541: if (ifa->ifa_addr->sa_family != AF_INET6)
542: continue;
543: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
544: ours = 1;
545: deliverifp = ifa->ifa_ifp;
1.2 itojun 546: goto hbhcheck;
547: }
548: }
1.9 itojun 549: }
1.2 itojun 550: #endif
551:
552: /*
553: * Now there is no reason to process the packet if it's not our own
554: * and we're not a router.
555: */
556: if (!ip6_forwarding) {
557: ip6stat.ip6s_cantforward++;
1.9 itojun 558: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 559: goto bad;
560: }
561:
562: hbhcheck:
563: /*
564: * Process Hop-by-Hop options header if it's contained.
565: * m may be modified in ip6_hopopts_input().
566: * If a JumboPayload option is included, plen will also be modified.
567: */
568: plen = (u_int32_t)ntohs(ip6->ip6_plen);
569: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 570: struct ip6_hbh *hbh;
571:
572: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
573: #if 0 /*touches NULL pointer*/
574: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
575: #endif
1.2 itojun 576: return; /* m have already been freed */
1.9 itojun 577: }
1.22 itojun 578:
1.2 itojun 579: /* adjust pointer */
580: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 581:
582: /*
583: * if the payload length field is 0 and the next header field
584: * indicates Hop-by-Hop Options header, then a Jumbo Payload
585: * option MUST be included.
586: */
587: if (ip6->ip6_plen == 0 && plen == 0) {
588: /*
589: * Note that if a valid jumbo payload option is
590: * contained, ip6_hoptops_input() must set a valid
591: * (non-zero) payload length to the variable plen.
592: */
593: ip6stat.ip6s_badoptions++;
594: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
595: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
596: icmp6_error(m, ICMP6_PARAM_PROB,
597: ICMP6_PARAMPROB_HEADER,
598: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
599: return;
600: }
1.9 itojun 601: #ifndef PULLDOWN_TEST
602: /* ip6_hopopts_input() ensures that mbuf is contiguous */
603: hbh = (struct ip6_hbh *)(ip6 + 1);
604: #else
605: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
606: sizeof(struct ip6_hbh));
607: if (hbh == NULL) {
608: ip6stat.ip6s_tooshort++;
609: return;
610: }
611: #endif
612: nxt = hbh->ip6h_nxt;
1.2 itojun 613:
614: /*
615: * accept the packet if a router alert option is included
616: * and we act as an IPv6 router.
617: */
1.5 itojun 618: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 619: ours = 1;
620: } else
621: nxt = ip6->ip6_nxt;
622:
623: /*
624: * Check that the amount of data in the buffers
625: * is as at least much as the IPv6 header would have us expect.
626: * Trim mbufs if longer than we expect.
627: * Drop packet if shorter than we expect.
628: */
629: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
630: ip6stat.ip6s_tooshort++;
1.9 itojun 631: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 632: goto bad;
633: }
634: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
635: if (m->m_len == m->m_pkthdr.len) {
636: m->m_len = sizeof(struct ip6_hdr) + plen;
637: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
638: } else
639: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
640: }
641:
642: /*
643: * Forward if desirable.
644: */
645: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
646: /*
647: * If we are acting as a multicast router, all
648: * incoming multicast packets are passed to the
649: * kernel-level multicast forwarding function.
650: * The packet is returned (relatively) intact; if
651: * ip6_mforward() returns a non-zero value, the packet
652: * must be discarded, else it may be accepted below.
653: */
654: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
655: ip6stat.ip6s_cantforward++;
656: m_freem(m);
657: return;
658: }
659: if (!ours) {
660: m_freem(m);
661: return;
662: }
1.22 itojun 663: } else if (!ours) {
1.2 itojun 664: ip6_forward(m, 0);
665: return;
666: }
667:
668: /*
669: * Tell launch routine the next header
670: */
1.12 itojun 671: #ifdef IFA_STATS
1.9 itojun 672: if (IFA_STATS && deliverifp != NULL) {
673: struct in6_ifaddr *ia6;
674: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
675: if (ia6)
676: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
677: }
678: #endif
1.2 itojun 679: ip6stat.ip6s_delivered++;
1.9 itojun 680: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 681: nest = 0;
682: while (nxt != IPPROTO_DONE) {
683: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
684: ip6stat.ip6s_toomanyhdr++;
685: goto bad;
686: }
1.8 itojun 687:
688: /*
689: * protection against faulty packet - there should be
690: * more sanity checks in header chain processing.
691: */
692: if (m->m_pkthdr.len < off) {
693: ip6stat.ip6s_tooshort++;
1.9 itojun 694: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 695: goto bad;
696: }
697:
1.2 itojun 698: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
699: }
700: return;
701: bad:
702: m_freem(m);
703: }
704:
705: /*
706: * Hop-by-Hop options header processing. If a valid jumbo payload option is
707: * included, the real payload length will be stored in plenp.
708: */
709: static int
710: ip6_hopopts_input(plenp, rtalertp, mp, offp)
711: u_int32_t *plenp;
1.5 itojun 712: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 713: struct mbuf **mp;
714: int *offp;
715: {
716: register struct mbuf *m = *mp;
717: int off = *offp, hbhlen;
718: struct ip6_hbh *hbh;
719: u_int8_t *opt;
720:
721: /* validation of the length of the header */
1.9 itojun 722: #ifndef PULLDOWN_TEST
1.2 itojun 723: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
724: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
725: hbhlen = (hbh->ip6h_len + 1) << 3;
726:
727: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
728: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 729: #else
730: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
731: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
732: if (hbh == NULL) {
733: ip6stat.ip6s_tooshort++;
734: return -1;
735: }
736: hbhlen = (hbh->ip6h_len + 1) << 3;
737: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
738: hbhlen);
739: if (hbh == NULL) {
740: ip6stat.ip6s_tooshort++;
741: return -1;
742: }
743: #endif
1.2 itojun 744: off += hbhlen;
745: hbhlen -= sizeof(struct ip6_hbh);
746: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
747:
748: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
749: hbhlen, rtalertp, plenp) < 0)
750: return(-1);
751:
752: *offp = off;
753: *mp = m;
754: return(0);
755: }
756:
757: /*
758: * Search header for all Hop-by-hop options and process each option.
759: * This function is separate from ip6_hopopts_input() in order to
760: * handle a case where the sending node itself process its hop-by-hop
761: * options header. In such a case, the function is called from ip6_output().
762: */
763: int
764: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
765: struct mbuf *m;
766: u_int8_t *opthead;
767: int hbhlen;
1.5 itojun 768: u_int32_t *rtalertp;
1.2 itojun 769: u_int32_t *plenp;
770: {
771: struct ip6_hdr *ip6;
772: int optlen = 0;
773: u_int8_t *opt = opthead;
774: u_int16_t rtalert_val;
1.22 itojun 775: u_int32_t jumboplen;
1.2 itojun 776:
777: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
778: switch(*opt) {
779: case IP6OPT_PAD1:
780: optlen = 1;
781: break;
782: case IP6OPT_PADN:
783: if (hbhlen < IP6OPT_MINLEN) {
784: ip6stat.ip6s_toosmall++;
785: goto bad;
786: }
787: optlen = *(opt + 1) + 2;
788: break;
789: case IP6OPT_RTALERT:
1.8 itojun 790: /* XXX may need check for alignment */
1.2 itojun 791: if (hbhlen < IP6OPT_RTALERT_LEN) {
792: ip6stat.ip6s_toosmall++;
793: goto bad;
794: }
795: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
796: /* XXX: should we discard the packet? */
797: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
798: *(opt + 1));
799: optlen = IP6OPT_RTALERT_LEN;
800: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
801: *rtalertp = ntohs(rtalert_val);
802: break;
803: case IP6OPT_JUMBO:
1.22 itojun 804: /* XXX may need check for alignment */
805: if (hbhlen < IP6OPT_JUMBO_LEN) {
806: ip6stat.ip6s_toosmall++;
807: goto bad;
808: }
809: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
810: /* XXX: should we discard the packet? */
811: log(LOG_ERR, "length of jumbopayload opt "
812: "is inconsistent(%d)",
813: *(opt + 1));
814: optlen = IP6OPT_JUMBO_LEN;
815:
816: /*
817: * IPv6 packets that have non 0 payload length
818: * must not contain a jumbo paylod option.
819: */
820: ip6 = mtod(m, struct ip6_hdr *);
821: if (ip6->ip6_plen) {
822: ip6stat.ip6s_badoptions++;
823: icmp6_error(m, ICMP6_PARAM_PROB,
824: ICMP6_PARAMPROB_HEADER,
825: sizeof(struct ip6_hdr) +
826: sizeof(struct ip6_hbh) +
827: opt - opthead);
828: return(-1);
829: }
1.2 itojun 830:
1.22 itojun 831: /*
832: * We may see jumbolen in unaligned location, so
833: * we'd need to perform bcopy().
834: */
835: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
836: jumboplen = (u_int32_t)htonl(jumboplen);
837:
838: #if 1
839: /*
840: * if there are multiple jumbo payload options,
841: * *plenp will be non-zero and the packet will be
842: * rejected.
843: * the behavior may need some debate in ipngwg -
844: * multiple options does not make sense, however,
845: * there's no explicit mention in specification.
846: */
847: if (*plenp != 0) {
848: ip6stat.ip6s_badoptions++;
849: icmp6_error(m, ICMP6_PARAM_PROB,
850: ICMP6_PARAMPROB_HEADER,
851: sizeof(struct ip6_hdr) +
852: sizeof(struct ip6_hbh) +
853: opt + 2 - opthead);
854: return(-1);
855: }
1.8 itojun 856: #endif
1.2 itojun 857:
1.22 itojun 858: /*
859: * jumbo payload length must be larger than 65535.
860: */
861: if (jumboplen <= IPV6_MAXPACKET) {
862: ip6stat.ip6s_badoptions++;
863: icmp6_error(m, ICMP6_PARAM_PROB,
864: ICMP6_PARAMPROB_HEADER,
865: sizeof(struct ip6_hdr) +
866: sizeof(struct ip6_hbh) +
867: opt + 2 - opthead);
868: return(-1);
869: }
870: *plenp = jumboplen;
871:
872: break;
1.2 itojun 873: default: /* unknown option */
874: if (hbhlen < IP6OPT_MINLEN) {
875: ip6stat.ip6s_toosmall++;
876: goto bad;
877: }
878: if ((optlen = ip6_unknown_opt(opt, m,
879: sizeof(struct ip6_hdr) +
880: sizeof(struct ip6_hbh) +
881: opt - opthead)) == -1)
882: return(-1);
883: optlen += 2;
884: break;
885: }
886: }
887:
888: return(0);
889:
890: bad:
891: m_freem(m);
892: return(-1);
893: }
894:
895: /*
896: * Unknown option processing.
897: * The third argument `off' is the offset from the IPv6 header to the option,
898: * which is necessary if the IPv6 header the and option header and IPv6 header
899: * is not continuous in order to return an ICMPv6 error.
900: */
901: int
902: ip6_unknown_opt(optp, m, off)
903: u_int8_t *optp;
904: struct mbuf *m;
905: int off;
906: {
907: struct ip6_hdr *ip6;
908:
909: switch(IP6OPT_TYPE(*optp)) {
910: case IP6OPT_TYPE_SKIP: /* ignore the option */
911: return((int)*(optp + 1));
912: case IP6OPT_TYPE_DISCARD: /* silently discard */
913: m_freem(m);
914: return(-1);
915: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
916: ip6stat.ip6s_badoptions++;
917: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
918: return(-1);
919: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
920: ip6stat.ip6s_badoptions++;
921: ip6 = mtod(m, struct ip6_hdr *);
922: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
923: (m->m_flags & (M_BCAST|M_MCAST)))
924: m_freem(m);
925: else
926: icmp6_error(m, ICMP6_PARAM_PROB,
927: ICMP6_PARAMPROB_OPTION, off);
928: return(-1);
929: }
930:
931: m_freem(m); /* XXX: NOTREACHED */
932: return(-1);
933: }
934:
935: /*
1.9 itojun 936: * Create the "control" list for this pcb.
937: *
938: * The routine will be called from upper layer handlers like tcp6_input().
939: * Thus the routine assumes that the caller (tcp6_input) have already
940: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
941: * very first mbuf on the mbuf chain.
942: * We may want to add some infinite loop prevention or sanity checks for safety.
943: * (This applies only when you are using KAME mbuf chain restriction, i.e.
944: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 945: */
946: void
947: ip6_savecontrol(in6p, mp, ip6, m)
948: register struct in6pcb *in6p;
949: register struct mbuf **mp;
950: register struct ip6_hdr *ip6;
951: register struct mbuf *m;
952: {
953: struct proc *p = curproc; /* XXX */
1.9 itojun 954: int privileged;
1.2 itojun 955:
1.9 itojun 956: privileged = 0;
957: if (p && !suser(p->p_ucred, &p->p_acflag))
958: privileged++;
959:
960: #ifdef SO_TIMESTAMP
1.2 itojun 961: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
962: struct timeval tv;
963:
964: microtime(&tv);
965: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
966: SCM_TIMESTAMP, SOL_SOCKET);
967: if (*mp)
968: mp = &(*mp)->m_next;
969: }
1.9 itojun 970: #endif
1.2 itojun 971: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
972: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
973: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
974: IPPROTO_IPV6);
975: if (*mp)
976: mp = &(*mp)->m_next;
977: }
978:
979: #ifdef noyet
980: /* options were tossed above */
981: if (in6p->in6p_flags & IN6P_RECVOPTS)
982: /* broken */
983: /* ip6_srcroute doesn't do what we want here, need to fix */
984: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
985: /* broken */
986: #endif
987:
988: /* RFC 2292 sec. 5 */
989: if (in6p->in6p_flags & IN6P_PKTINFO) {
990: struct in6_pktinfo pi6;
991: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
992: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
993: pi6.ipi6_addr.s6_addr16[1] = 0;
994: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
995: ? m->m_pkthdr.rcvif->if_index
996: : 0;
997: *mp = sbcreatecontrol((caddr_t) &pi6,
998: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
999: IPPROTO_IPV6);
1000: if (*mp)
1001: mp = &(*mp)->m_next;
1002: }
1003: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1004: int hlim = ip6->ip6_hlim & 0xff;
1005: *mp = sbcreatecontrol((caddr_t) &hlim,
1006: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1007: if (*mp)
1008: mp = &(*mp)->m_next;
1009: }
1010: /* IN6P_NEXTHOP - for outgoing packet only */
1011:
1012: /*
1013: * IPV6_HOPOPTS socket option. We require super-user privilege
1014: * for the option, but it might be too strict, since there might
1015: * be some hop-by-hop options which can be returned to normal user.
1016: * See RFC 2292 section 6.
1017: */
1.9 itojun 1018: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1019: /*
1020: * Check if a hop-by-hop options header is contatined in the
1021: * received packet, and if so, store the options as ancillary
1022: * data. Note that a hop-by-hop options header must be
1023: * just after the IPv6 header, which fact is assured through
1024: * the IPv6 input processing.
1025: */
1026: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1027: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1028: struct ip6_hbh *hbh;
1029: int hbhlen;
1030:
1031: #ifndef PULLDOWN_TEST
1032: hbh = (struct ip6_hbh *)(ip6 + 1);
1033: hbhlen = (hbh->ip6h_len + 1) << 3;
1034: #else
1035: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1036: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1037: if (hbh == NULL) {
1038: ip6stat.ip6s_tooshort++;
1039: return;
1040: }
1041: hbhlen = (hbh->ip6h_len + 1) << 3;
1042: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1043: sizeof(struct ip6_hdr), hbhlen);
1044: if (hbh == NULL) {
1045: ip6stat.ip6s_tooshort++;
1046: return;
1047: }
1048: #endif
1.2 itojun 1049:
1050: /*
1051: * XXX: We copy whole the header even if a jumbo
1052: * payload option is included, which option is to
1053: * be removed before returning in the RFC 2292.
1054: * But it's too painful operation...
1055: */
1.9 itojun 1056: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1057: IPV6_HOPOPTS, IPPROTO_IPV6);
1058: if (*mp)
1059: mp = &(*mp)->m_next;
1060: }
1061: }
1062:
1063: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1064: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1065: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1066: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1067:
1068: /*
1069: * Search for destination options headers or routing
1070: * header(s) through the header chain, and stores each
1071: * header as ancillary data.
1072: * Note that the order of the headers remains in
1073: * the chain of ancillary data.
1074: */
1075: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1076: struct ip6_ext *ip6e;
1077: int elen;
1078:
1079: #ifndef PULLDOWN_TEST
1080: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1081: if (nxt == IPPROTO_AH)
1082: elen = (ip6e->ip6e_len + 2) << 2;
1083: else
1084: elen = (ip6e->ip6e_len + 1) << 3;
1085: #else
1086: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1087: sizeof(struct ip6_ext));
1088: if (ip6e == NULL) {
1089: ip6stat.ip6s_tooshort++;
1090: return;
1091: }
1092: if (nxt == IPPROTO_AH)
1093: elen = (ip6e->ip6e_len + 2) << 2;
1094: else
1095: elen = (ip6e->ip6e_len + 1) << 3;
1096: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1097: if (ip6e == NULL) {
1098: ip6stat.ip6s_tooshort++;
1099: return;
1100: }
1101: #endif
1.2 itojun 1102:
1103: switch(nxt) {
1104: case IPPROTO_DSTOPTS:
1105: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1106: break;
1107:
1108: /*
1109: * We also require super-user privilege for
1110: * the option.
1111: * See the comments on IN6_HOPOPTS.
1112: */
1.9 itojun 1113: if (!privileged)
1.2 itojun 1114: break;
1115:
1.9 itojun 1116: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1117: IPV6_DSTOPTS,
1118: IPPROTO_IPV6);
1119: if (*mp)
1120: mp = &(*mp)->m_next;
1121: break;
1122:
1123: case IPPROTO_ROUTING:
1124: if (!in6p->in6p_flags & IN6P_RTHDR)
1125: break;
1126:
1.9 itojun 1127: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1128: IPV6_RTHDR,
1129: IPPROTO_IPV6);
1130: if (*mp)
1131: mp = &(*mp)->m_next;
1132: break;
1133:
1134: case IPPROTO_UDP:
1135: case IPPROTO_TCP:
1136: case IPPROTO_ICMPV6:
1137: default:
1138: /*
1139: * stop search if we encounter an upper
1140: * layer protocol headers.
1141: */
1142: goto loopend;
1143:
1144: case IPPROTO_HOPOPTS:
1145: case IPPROTO_AH: /* is it possible? */
1146: break;
1147: }
1148:
1149: /* proceed with the next header. */
1.9 itojun 1150: off += elen;
1.2 itojun 1151: nxt = ip6e->ip6e_nxt;
1152: }
1153: loopend:
1154: }
1.9 itojun 1155: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1156: /* to be done */
1157: }
1.9 itojun 1158: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1159: /* to be done */
1160: }
1161: /* IN6P_RTHDR - to be done */
1162:
1163: }
1164:
1165: /*
1166: * Get pointer to the previous header followed by the header
1167: * currently processed.
1168: * XXX: This function supposes that
1169: * M includes all headers,
1170: * the next header field and the header length field of each header
1171: * are valid, and
1172: * the sum of each header length equals to OFF.
1173: * Because of these assumptions, this function must be called very
1174: * carefully. Moreover, it will not be used in the near future when
1175: * we develop `neater' mechanism to process extension headers.
1176: */
1177: char *
1178: ip6_get_prevhdr(m, off)
1179: struct mbuf *m;
1180: int off;
1181: {
1182: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1183:
1184: if (off == sizeof(struct ip6_hdr))
1185: return(&ip6->ip6_nxt);
1186: else {
1187: int len, nxt;
1188: struct ip6_ext *ip6e = NULL;
1189:
1190: nxt = ip6->ip6_nxt;
1191: len = sizeof(struct ip6_hdr);
1192: while (len < off) {
1193: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1194:
1195: switch(nxt) {
1196: case IPPROTO_FRAGMENT:
1197: len += sizeof(struct ip6_frag);
1198: break;
1199: case IPPROTO_AH:
1200: len += (ip6e->ip6e_len + 2) << 2;
1201: break;
1202: default:
1203: len += (ip6e->ip6e_len + 1) << 3;
1204: break;
1205: }
1206: nxt = ip6e->ip6e_nxt;
1207: }
1208: if (ip6e)
1209: return(&ip6e->ip6e_nxt);
1210: else
1211: return NULL;
1.18 itojun 1212: }
1213: }
1214:
1215: /*
1216: * get next header offset. m will be retained.
1217: */
1218: int
1219: ip6_nexthdr(m, off, proto, nxtp)
1220: struct mbuf *m;
1221: int off;
1222: int proto;
1223: int *nxtp;
1224: {
1225: struct ip6_hdr ip6;
1226: struct ip6_ext ip6e;
1227: struct ip6_frag fh;
1228:
1229: /* just in case */
1230: if (m == NULL)
1231: panic("ip6_nexthdr: m == NULL");
1232: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1233: return -1;
1234:
1235: switch (proto) {
1236: case IPPROTO_IPV6:
1237: if (m->m_pkthdr.len < off + sizeof(ip6))
1238: return -1;
1239: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1240: if (nxtp)
1241: *nxtp = ip6.ip6_nxt;
1242: off += sizeof(ip6);
1243: return off;
1244:
1245: case IPPROTO_FRAGMENT:
1246: /*
1247: * terminate parsing if it is not the first fragment,
1248: * it does not make sense to parse through it.
1249: */
1250: if (m->m_pkthdr.len < off + sizeof(fh))
1251: return -1;
1252: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1253: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1254: return -1;
1255: if (nxtp)
1256: *nxtp = fh.ip6f_nxt;
1257: off += sizeof(struct ip6_frag);
1258: return off;
1259:
1260: case IPPROTO_AH:
1261: if (m->m_pkthdr.len < off + sizeof(ip6e))
1262: return -1;
1263: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1264: if (nxtp)
1265: *nxtp = ip6e.ip6e_nxt;
1266: off += (ip6e.ip6e_len + 2) << 2;
1267: return off;
1268:
1269: case IPPROTO_HOPOPTS:
1270: case IPPROTO_ROUTING:
1271: case IPPROTO_DSTOPTS:
1272: if (m->m_pkthdr.len < off + sizeof(ip6e))
1273: return -1;
1274: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1275: if (nxtp)
1276: *nxtp = ip6e.ip6e_nxt;
1277: off += (ip6e.ip6e_len + 1) << 3;
1278: return off;
1279:
1280: case IPPROTO_NONE:
1281: case IPPROTO_ESP:
1282: case IPPROTO_IPCOMP:
1283: /* give up */
1284: return -1;
1285:
1286: default:
1287: return -1;
1288: }
1289:
1290: return -1;
1291: }
1292:
1293: /*
1294: * get offset for the last header in the chain. m will be kept untainted.
1295: */
1296: int
1297: ip6_lasthdr(m, off, proto, nxtp)
1298: struct mbuf *m;
1299: int off;
1300: int proto;
1301: int *nxtp;
1302: {
1303: int newoff;
1304: int nxt;
1305:
1306: if (!nxtp) {
1307: nxt = -1;
1308: nxtp = &nxt;
1309: }
1310: while (1) {
1311: newoff = ip6_nexthdr(m, off, proto, nxtp);
1312: if (newoff < 0)
1313: return off;
1314: else if (newoff < off)
1315: return -1; /* invalid */
1316: else if (newoff == off)
1317: return newoff;
1318:
1319: off = newoff;
1320: proto = *nxtp;
1.2 itojun 1321: }
1322: }
1323:
1324: /*
1325: * System control for IP6
1326: */
1327:
1328: u_char inet6ctlerrmap[PRC_NCMDS] = {
1329: 0, 0, 0, 0,
1330: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1331: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1332: EMSGSIZE, EHOSTUNREACH, 0, 0,
1333: 0, 0, 0, 0,
1334: ENOPROTOOPT
1335: };
1336:
1337: #include <vm/vm.h>
1338: #include <sys/sysctl.h>
1339:
1340: int
1341: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1342: int *name;
1343: u_int namelen;
1344: void *oldp;
1345: size_t *oldlenp;
1346: void *newp;
1347: size_t newlen;
1348: {
1349: /* All sysctl names at this level are terminal. */
1350: if (namelen != 1)
1351: return ENOTDIR;
1352:
1353: switch (name[0]) {
1354:
1355: case IPV6CTL_FORWARDING:
1356: return sysctl_int(oldp, oldlenp, newp, newlen,
1357: &ip6_forwarding);
1358: case IPV6CTL_SENDREDIRECTS:
1359: return sysctl_int(oldp, oldlenp, newp, newlen,
1360: &ip6_sendredirects);
1361: case IPV6CTL_DEFHLIM:
1362: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1363: case IPV6CTL_MAXFRAGPACKETS:
1364: return sysctl_int(oldp, oldlenp, newp, newlen,
1365: &ip6_maxfragpackets);
1366: case IPV6CTL_ACCEPT_RTADV:
1367: return sysctl_int(oldp, oldlenp, newp, newlen,
1368: &ip6_accept_rtadv);
1369: case IPV6CTL_KEEPFAITH:
1370: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1371: case IPV6CTL_LOG_INTERVAL:
1372: return sysctl_int(oldp, oldlenp, newp, newlen,
1373: &ip6_log_interval);
1374: case IPV6CTL_HDRNESTLIMIT:
1375: return sysctl_int(oldp, oldlenp, newp, newlen,
1376: &ip6_hdrnestlimit);
1377: case IPV6CTL_DAD_COUNT:
1378: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1379: case IPV6CTL_AUTO_FLOWLABEL:
1380: return sysctl_int(oldp, oldlenp, newp, newlen,
1381: &ip6_auto_flowlabel);
1382: case IPV6CTL_DEFMCASTHLIM:
1383: return sysctl_int(oldp, oldlenp, newp, newlen,
1384: &ip6_defmcasthlim);
1385: case IPV6CTL_GIF_HLIM:
1386: return sysctl_int(oldp, oldlenp, newp, newlen,
1387: &ip6_gif_hlim);
1388: case IPV6CTL_KAME_VERSION:
1389: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1390: case IPV6CTL_USE_DEPRECATED:
1391: return sysctl_int(oldp, oldlenp, newp, newlen,
1392: &ip6_use_deprecated);
1.10 itojun 1393: case IPV6CTL_RR_PRUNE:
1394: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1395: #ifndef INET6_BINDV6ONLY
1.11 itojun 1396: case IPV6CTL_BINDV6ONLY:
1397: return sysctl_int(oldp, oldlenp, newp, newlen,
1398: &ip6_bindv6only);
1399: #endif
1.2 itojun 1400: default:
1401: return EOPNOTSUPP;
1402: }
1403: /* NOTREACHED */
1404: }
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