Annotation of src/sys/netinet6/ip6_input.c, Revision 1.37
1.37 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.36 2001/02/24 00:02:16 cgd Exp $ */
! 2: /* $KAME: ip6_input.c,v 1.183 2001/03/01 15:15:23 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:
1.37 ! itojun 110: #ifdef IPSEC
! 111: #include <netinet6/ipsec.h>
! 112: #endif
! 113:
1.2 itojun 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:
1.29 thorpej 137: #ifdef PFIL_HOOKS
138: struct pfil_head inet6_pfil_hook;
139: #endif
140:
1.2 itojun 141: struct ip6stat ip6stat;
142:
143: static void ip6_init2 __P((void *));
144:
1.5 itojun 145: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 146:
147: /*
148: * IP6 initialization: fill in IP6 protocol switch table.
149: * All protocols not implemented in kernel go to raw IP6 protocol handler.
150: */
151: void
152: ip6_init()
153: {
1.35 itojun 154: struct ip6protosw *pr;
155: int i;
1.2 itojun 156: struct timeval tv;
157:
158: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
159: if (pr == 0)
160: panic("ip6_init");
161: for (i = 0; i < IPPROTO_MAX; i++)
162: ip6_protox[i] = pr - inet6sw;
163: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
164: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
165: if (pr->pr_domain->dom_family == PF_INET6 &&
166: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
167: ip6_protox[pr->pr_protocol] = pr - inet6sw;
168: ip6intrq.ifq_maxlen = ip6qmaxlen;
169: nd6_init();
170: frag6_init();
171: /*
172: * in many cases, random() here does NOT return random number
173: * as initialization during bootstrap time occur in fixed order.
174: */
175: microtime(&tv);
176: ip6_flow_seq = random() ^ tv.tv_usec;
177:
178: ip6_init2((void *)0);
1.29 thorpej 179:
180: #ifdef PFIL_HOOKS
181: /* Register our Packet Filter hook. */
1.33 thorpej 182: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
183: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 184: i = pfil_head_register(&inet6_pfil_hook);
185: if (i != 0)
186: printf("ip6_init: WARNING: unable to register pfil hook, "
187: "error %d\n", i);
188: #endif /* PFIL_HOOKS */
1.2 itojun 189: }
190:
191: static void
192: ip6_init2(dummy)
193: void *dummy;
194: {
195: /*
196: * to route local address of p2p link to loopback,
1.21 itojun 197: * assign loopback address first.
1.2 itojun 198: */
1.20 itojun 199: in6_ifattach(&loif[0], NULL);
1.2 itojun 200:
201: /* nd6_timer_init */
1.19 thorpej 202: callout_init(&nd6_timer_ch);
203: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 204: /* router renumbering prefix list maintenance */
1.19 thorpej 205: callout_init(&in6_rr_timer_ch);
206: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 207: }
208:
209: /*
210: * IP6 input interrupt handling. Just pass the packet to ip6_input.
211: */
212: void
213: ip6intr()
214: {
215: int s;
216: struct mbuf *m;
217:
218: for (;;) {
219: s = splimp();
220: IF_DEQUEUE(&ip6intrq, m);
221: splx(s);
222: if (m == 0)
223: return;
224: ip6_input(m);
225: }
226: }
227:
228: extern struct route_in6 ip6_forward_rt;
229:
230: void
231: ip6_input(m)
232: struct mbuf *m;
233: {
1.9 itojun 234: struct ip6_hdr *ip6;
1.2 itojun 235: int off = sizeof(struct ip6_hdr), nest;
236: u_int32_t plen;
1.5 itojun 237: u_int32_t rtalert = ~0;
1.2 itojun 238: int nxt, ours = 0;
1.9 itojun 239: struct ifnet *deliverifp = NULL;
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: */
1.29 thorpej 306: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
307: PFIL_IN) != 0)
308: return;
309: if (m == NULL)
310: return;
311: ip6 = mtod(m, struct ip6_hdr *);
1.15 darrenr 312: #endif /* PFIL_HOOKS */
313:
1.2 itojun 314:
315: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
316:
1.30 thorpej 317: #ifdef ALTQ
318: /* XXX Temporary until ALTQ is changed to use a pfil hook */
319: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
320: /* packet is dropped by traffic conditioner */
321: return;
1.9 itojun 322: }
323: #endif
324:
1.2 itojun 325: /*
326: * Scope check
327: */
328: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
329: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
330: ip6stat.ip6s_badscope++;
1.9 itojun 331: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 332: goto bad;
333: }
1.13 itojun 334: /*
335: * The following check is not documented in the spec. Malicious party
336: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
337: * bypass security checks (act as if it was from 127.0.0.1 by using
338: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 339: *
340: * This check chokes if we are in SIIT cloud. As none of BSDs support
341: * IPv4-less kernel compilation, we cannot support SIIT environment
342: * at all. So, it makes more sense for us to reject any malicious
343: * packets for non-SIIT environment, than try to do a partical support
344: * for SIIT environment.
1.13 itojun 345: */
346: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
347: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
348: ip6stat.ip6s_badscope++;
349: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
350: goto bad;
351: }
1.17 itojun 352: #if 0
1.13 itojun 353: /*
1.17 itojun 354: * Reject packets with IPv4 compatible addresses (auto tunnel).
355: *
356: * The code forbids auto tunnel relay case in RFC1933 (the check is
357: * stronger than RFC1933). We may want to re-enable it if mech-xx
358: * is revised to forbid relaying case.
1.13 itojun 359: */
360: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
361: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
362: ip6stat.ip6s_badscope++;
363: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
364: goto bad;
365: }
366: #endif
1.35 itojun 367:
1.2 itojun 368: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
369: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
370: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
371: ours = 1;
1.9 itojun 372: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 373: goto hbhcheck;
374: } else {
375: ip6stat.ip6s_badscope++;
1.9 itojun 376: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 377: goto bad;
378: }
379: }
380:
1.21 itojun 381: #ifndef FAKE_LOOPBACK_IF
382: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
383: #else
384: if (1)
385: #endif
386: {
1.2 itojun 387: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
388: ip6->ip6_src.s6_addr16[1]
389: = htons(m->m_pkthdr.rcvif->if_index);
390: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
391: ip6->ip6_dst.s6_addr16[1]
392: = htons(m->m_pkthdr.rcvif->if_index);
393: }
394:
1.9 itojun 395: /*
1.21 itojun 396: * XXX we need this since we do not have "goto ours" hack route
397: * for some of our ifaddrs on loopback interface.
398: * we should correct it by changing in6_ifattach to install
399: * "goto ours" hack route.
1.9 itojun 400: */
1.21 itojun 401: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
402: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
403: ours = 1;
404: deliverifp = m->m_pkthdr.rcvif;
405: goto hbhcheck;
406: }
1.9 itojun 407: }
408:
1.2 itojun 409: /*
410: * Multicast check
411: */
412: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
413: struct in6_multi *in6m = 0;
1.9 itojun 414:
415: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 416: /*
417: * See if we belong to the destination multicast group on the
418: * arrival interface.
419: */
420: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
421: if (in6m)
422: ours = 1;
423: else if (!ip6_mrouter) {
424: ip6stat.ip6s_notmember++;
425: ip6stat.ip6s_cantforward++;
1.9 itojun 426: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 427: goto bad;
428: }
1.9 itojun 429: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 430: goto hbhcheck;
431: }
432:
433: /*
434: * Unicast check
435: */
1.22 itojun 436: if (ip6_forward_rt.ro_rt != NULL &&
437: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
438: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 439: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 440: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 441: else {
1.35 itojun 442: struct sockaddr_in6 *dst6;
443:
1.2 itojun 444: if (ip6_forward_rt.ro_rt) {
1.22 itojun 445: /* route is down or destination is different */
1.25 itojun 446: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 447: RTFREE(ip6_forward_rt.ro_rt);
448: ip6_forward_rt.ro_rt = 0;
449: }
1.22 itojun 450:
1.2 itojun 451: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 452: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
453: dst6->sin6_len = sizeof(struct sockaddr_in6);
454: dst6->sin6_family = AF_INET6;
455: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 456:
1.9 itojun 457: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 458: }
459:
460: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
461:
462: /*
463: * Accept the packet if the forwarding interface to the destination
464: * according to the routing table is the loopback interface,
465: * unless the associated route has a gateway.
466: * Note that this approach causes to accept a packet if there is a
467: * route to the loopback interface for the destination of the packet.
468: * But we think it's even useful in some situations, e.g. when using
469: * a special daemon which wants to intercept the packet.
470: */
471: if (ip6_forward_rt.ro_rt &&
472: (ip6_forward_rt.ro_rt->rt_flags &
473: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
474: #if 0
475: /*
476: * The check below is redundant since the comparison of
477: * the destination and the key of the rtentry has
478: * already done through looking up the routing table.
479: */
480: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
481: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
482: #endif
1.9 itojun 483: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 484: struct in6_ifaddr *ia6 =
485: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
486: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
487: m->m_flags |= M_ANYCAST6;
1.24 itojun 488: /*
489: * packets to a tentative, duplicated, or somehow invalid
490: * address must not be accepted.
491: */
1.2 itojun 492: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 493: /* this address is ready */
1.2 itojun 494: ours = 1;
1.9 itojun 495: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 496: goto hbhcheck;
497: } else {
1.24 itojun 498: /* address is not ready, so discard the packet. */
1.34 itojun 499: nd6log((LOG_INFO,
1.27 itojun 500: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 501: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 502: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 503:
504: goto bad;
1.2 itojun 505: }
506: }
507:
508: /*
509: * FAITH(Firewall Aided Internet Translator)
510: */
511: #if defined(NFAITH) && 0 < NFAITH
512: if (ip6_keepfaith) {
513: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
514: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
515: /* XXX do we need more sanity checks? */
516: ours = 1;
1.9 itojun 517: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
518: goto hbhcheck;
519: }
520: }
521: #endif
522:
523: #if 0
524: {
525: /*
526: * Last resort: check in6_ifaddr for incoming interface.
527: * The code is here until I update the "goto ours hack" code above
528: * working right.
529: */
530: struct ifaddr *ifa;
531: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
532: ifa;
533: ifa = ifa->ifa_list.tqe_next) {
534: if (ifa->ifa_addr == NULL)
535: continue; /* just for safety */
536: if (ifa->ifa_addr->sa_family != AF_INET6)
537: continue;
538: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
539: ours = 1;
540: deliverifp = ifa->ifa_ifp;
1.2 itojun 541: goto hbhcheck;
542: }
543: }
1.9 itojun 544: }
1.2 itojun 545: #endif
546:
547: /*
548: * Now there is no reason to process the packet if it's not our own
549: * and we're not a router.
550: */
551: if (!ip6_forwarding) {
552: ip6stat.ip6s_cantforward++;
1.9 itojun 553: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 554: goto bad;
555: }
556:
557: hbhcheck:
558: /*
559: * Process Hop-by-Hop options header if it's contained.
560: * m may be modified in ip6_hopopts_input().
561: * If a JumboPayload option is included, plen will also be modified.
562: */
563: plen = (u_int32_t)ntohs(ip6->ip6_plen);
564: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 565: struct ip6_hbh *hbh;
566:
567: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
568: #if 0 /*touches NULL pointer*/
569: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
570: #endif
1.2 itojun 571: return; /* m have already been freed */
1.9 itojun 572: }
1.22 itojun 573:
1.2 itojun 574: /* adjust pointer */
575: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 576:
577: /*
578: * if the payload length field is 0 and the next header field
579: * indicates Hop-by-Hop Options header, then a Jumbo Payload
580: * option MUST be included.
581: */
582: if (ip6->ip6_plen == 0 && plen == 0) {
583: /*
584: * Note that if a valid jumbo payload option is
585: * contained, ip6_hoptops_input() must set a valid
586: * (non-zero) payload length to the variable plen.
587: */
588: ip6stat.ip6s_badoptions++;
589: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
590: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
591: icmp6_error(m, ICMP6_PARAM_PROB,
592: ICMP6_PARAMPROB_HEADER,
593: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
594: return;
595: }
1.9 itojun 596: #ifndef PULLDOWN_TEST
597: /* ip6_hopopts_input() ensures that mbuf is contiguous */
598: hbh = (struct ip6_hbh *)(ip6 + 1);
599: #else
600: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
601: sizeof(struct ip6_hbh));
602: if (hbh == NULL) {
603: ip6stat.ip6s_tooshort++;
604: return;
605: }
606: #endif
607: nxt = hbh->ip6h_nxt;
1.2 itojun 608:
609: /*
610: * accept the packet if a router alert option is included
611: * and we act as an IPv6 router.
612: */
1.5 itojun 613: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 614: ours = 1;
615: } else
616: nxt = ip6->ip6_nxt;
617:
618: /*
619: * Check that the amount of data in the buffers
620: * is as at least much as the IPv6 header would have us expect.
621: * Trim mbufs if longer than we expect.
622: * Drop packet if shorter than we expect.
623: */
624: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
625: ip6stat.ip6s_tooshort++;
1.9 itojun 626: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 627: goto bad;
628: }
629: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
630: if (m->m_len == m->m_pkthdr.len) {
631: m->m_len = sizeof(struct ip6_hdr) + plen;
632: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
633: } else
634: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
635: }
636:
637: /*
638: * Forward if desirable.
639: */
640: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
641: /*
642: * If we are acting as a multicast router, all
643: * incoming multicast packets are passed to the
644: * kernel-level multicast forwarding function.
645: * The packet is returned (relatively) intact; if
646: * ip6_mforward() returns a non-zero value, the packet
647: * must be discarded, else it may be accepted below.
648: */
649: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
650: ip6stat.ip6s_cantforward++;
651: m_freem(m);
652: return;
653: }
654: if (!ours) {
655: m_freem(m);
656: return;
657: }
1.22 itojun 658: } else if (!ours) {
1.2 itojun 659: ip6_forward(m, 0);
660: return;
661: }
1.25 itojun 662:
663: ip6 = mtod(m, struct ip6_hdr *);
664:
665: /*
666: * Malicious party may be able to use IPv4 mapped addr to confuse
667: * tcp/udp stack and bypass security checks (act as if it was from
668: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
669: *
670: * For SIIT end node behavior, you may want to disable the check.
671: * However, you will become vulnerable to attacks using IPv4 mapped
672: * source.
673: */
674: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
675: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
676: ip6stat.ip6s_badscope++;
677: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
678: goto bad;
679: }
1.2 itojun 680:
681: /*
682: * Tell launch routine the next header
683: */
1.12 itojun 684: #ifdef IFA_STATS
1.28 itojun 685: if (deliverifp != NULL) {
1.9 itojun 686: struct in6_ifaddr *ia6;
687: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
688: if (ia6)
689: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
690: }
691: #endif
1.2 itojun 692: ip6stat.ip6s_delivered++;
1.9 itojun 693: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 694: nest = 0;
695: while (nxt != IPPROTO_DONE) {
696: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
697: ip6stat.ip6s_toomanyhdr++;
698: goto bad;
699: }
1.8 itojun 700:
701: /*
702: * protection against faulty packet - there should be
703: * more sanity checks in header chain processing.
704: */
705: if (m->m_pkthdr.len < off) {
706: ip6stat.ip6s_tooshort++;
1.9 itojun 707: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 708: goto bad;
709: }
710:
1.37 ! itojun 711: #ifdef IPSEC
! 712: /*
! 713: * enforce IPsec policy checking if we are seeing last header.
! 714: * note that we do not visit this with protocols with pcb layer
! 715: * code - like udp/tcp/raw ip.
! 716: */
! 717: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
! 718: ipsec6_in_reject(m, NULL)) {
! 719: ipsec6stat.in_polvio++;
! 720: goto bad;
! 721: }
! 722: #endif
! 723:
1.2 itojun 724: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
725: }
726: return;
727: bad:
728: m_freem(m);
729: }
730:
731: /*
732: * Hop-by-Hop options header processing. If a valid jumbo payload option is
733: * included, the real payload length will be stored in plenp.
734: */
735: static int
736: ip6_hopopts_input(plenp, rtalertp, mp, offp)
737: u_int32_t *plenp;
1.5 itojun 738: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 739: struct mbuf **mp;
740: int *offp;
741: {
1.35 itojun 742: struct mbuf *m = *mp;
1.2 itojun 743: int off = *offp, hbhlen;
744: struct ip6_hbh *hbh;
745: u_int8_t *opt;
746:
747: /* validation of the length of the header */
1.9 itojun 748: #ifndef PULLDOWN_TEST
1.2 itojun 749: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
750: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
751: hbhlen = (hbh->ip6h_len + 1) << 3;
752:
753: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
754: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 755: #else
756: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
757: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
758: if (hbh == NULL) {
759: ip6stat.ip6s_tooshort++;
760: return -1;
761: }
762: hbhlen = (hbh->ip6h_len + 1) << 3;
763: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
764: hbhlen);
765: if (hbh == NULL) {
766: ip6stat.ip6s_tooshort++;
767: return -1;
768: }
769: #endif
1.2 itojun 770: off += hbhlen;
771: hbhlen -= sizeof(struct ip6_hbh);
772: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
773:
774: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
775: hbhlen, rtalertp, plenp) < 0)
776: return(-1);
777:
778: *offp = off;
779: *mp = m;
780: return(0);
781: }
782:
783: /*
784: * Search header for all Hop-by-hop options and process each option.
785: * This function is separate from ip6_hopopts_input() in order to
786: * handle a case where the sending node itself process its hop-by-hop
787: * options header. In such a case, the function is called from ip6_output().
788: */
789: int
790: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
791: struct mbuf *m;
792: u_int8_t *opthead;
793: int hbhlen;
1.5 itojun 794: u_int32_t *rtalertp;
1.2 itojun 795: u_int32_t *plenp;
796: {
797: struct ip6_hdr *ip6;
798: int optlen = 0;
799: u_int8_t *opt = opthead;
800: u_int16_t rtalert_val;
1.22 itojun 801: u_int32_t jumboplen;
1.2 itojun 802:
803: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 804: switch (*opt) {
805: case IP6OPT_PAD1:
806: optlen = 1;
807: break;
808: case IP6OPT_PADN:
809: if (hbhlen < IP6OPT_MINLEN) {
810: ip6stat.ip6s_toosmall++;
811: goto bad;
812: }
813: optlen = *(opt + 1) + 2;
814: break;
815: case IP6OPT_RTALERT:
816: /* XXX may need check for alignment */
817: if (hbhlen < IP6OPT_RTALERT_LEN) {
818: ip6stat.ip6s_toosmall++;
819: goto bad;
820: }
821: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
822: /* XXX: should we discard the packet? */
823: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
824: *(opt + 1));
825: }
826: optlen = IP6OPT_RTALERT_LEN;
827: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
828: *rtalertp = ntohs(rtalert_val);
829: break;
830: case IP6OPT_JUMBO:
1.22 itojun 831: /* XXX may need check for alignment */
832: if (hbhlen < IP6OPT_JUMBO_LEN) {
833: ip6stat.ip6s_toosmall++;
834: goto bad;
835: }
1.35 itojun 836: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
837: /* XXX: should we discard the packet? */
1.22 itojun 838: log(LOG_ERR, "length of jumbopayload opt "
1.27 itojun 839: "is inconsistent(%d)\n",
1.22 itojun 840: *(opt + 1));
1.35 itojun 841: }
1.22 itojun 842: optlen = IP6OPT_JUMBO_LEN;
843:
844: /*
845: * IPv6 packets that have non 0 payload length
1.35 itojun 846: * must not contain a jumbo payload option.
1.22 itojun 847: */
848: ip6 = mtod(m, struct ip6_hdr *);
849: if (ip6->ip6_plen) {
850: ip6stat.ip6s_badoptions++;
851: icmp6_error(m, ICMP6_PARAM_PROB,
852: ICMP6_PARAMPROB_HEADER,
853: sizeof(struct ip6_hdr) +
854: sizeof(struct ip6_hbh) +
855: opt - opthead);
856: return(-1);
857: }
1.2 itojun 858:
1.22 itojun 859: /*
860: * We may see jumbolen in unaligned location, so
861: * we'd need to perform bcopy().
862: */
863: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
864: jumboplen = (u_int32_t)htonl(jumboplen);
865:
866: #if 1
867: /*
868: * if there are multiple jumbo payload options,
869: * *plenp will be non-zero and the packet will be
870: * rejected.
871: * the behavior may need some debate in ipngwg -
872: * multiple options does not make sense, however,
873: * there's no explicit mention in specification.
874: */
875: if (*plenp != 0) {
876: ip6stat.ip6s_badoptions++;
877: icmp6_error(m, ICMP6_PARAM_PROB,
878: ICMP6_PARAMPROB_HEADER,
879: sizeof(struct ip6_hdr) +
880: sizeof(struct ip6_hbh) +
881: opt + 2 - opthead);
882: return(-1);
883: }
1.8 itojun 884: #endif
1.2 itojun 885:
1.22 itojun 886: /*
887: * jumbo payload length must be larger than 65535.
888: */
889: if (jumboplen <= IPV6_MAXPACKET) {
890: ip6stat.ip6s_badoptions++;
891: icmp6_error(m, ICMP6_PARAM_PROB,
892: ICMP6_PARAMPROB_HEADER,
893: sizeof(struct ip6_hdr) +
894: sizeof(struct ip6_hbh) +
895: opt + 2 - opthead);
896: return(-1);
897: }
898: *plenp = jumboplen;
899:
900: break;
1.35 itojun 901: default: /* unknown option */
902: if (hbhlen < IP6OPT_MINLEN) {
903: ip6stat.ip6s_toosmall++;
904: goto bad;
905: }
906: if ((optlen = ip6_unknown_opt(opt, m,
907: sizeof(struct ip6_hdr) +
908: sizeof(struct ip6_hbh) +
909: opt - opthead)) == -1)
910: return(-1);
911: optlen += 2;
912: break;
1.2 itojun 913: }
914: }
915:
916: return(0);
917:
918: bad:
919: m_freem(m);
920: return(-1);
921: }
922:
923: /*
924: * Unknown option processing.
925: * The third argument `off' is the offset from the IPv6 header to the option,
926: * which is necessary if the IPv6 header the and option header and IPv6 header
927: * is not continuous in order to return an ICMPv6 error.
928: */
929: int
930: ip6_unknown_opt(optp, m, off)
931: u_int8_t *optp;
932: struct mbuf *m;
933: int off;
934: {
935: struct ip6_hdr *ip6;
936:
1.35 itojun 937: switch (IP6OPT_TYPE(*optp)) {
938: case IP6OPT_TYPE_SKIP: /* ignore the option */
939: return((int)*(optp + 1));
940: case IP6OPT_TYPE_DISCARD: /* silently discard */
941: m_freem(m);
942: return(-1);
943: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
944: ip6stat.ip6s_badoptions++;
945: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
946: return(-1);
947: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
948: ip6stat.ip6s_badoptions++;
949: ip6 = mtod(m, struct ip6_hdr *);
950: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
951: (m->m_flags & (M_BCAST|M_MCAST)))
952: m_freem(m);
953: else
954: icmp6_error(m, ICMP6_PARAM_PROB,
955: ICMP6_PARAMPROB_OPTION, off);
956: return(-1);
1.2 itojun 957: }
958:
959: m_freem(m); /* XXX: NOTREACHED */
960: return(-1);
961: }
962:
963: /*
1.9 itojun 964: * Create the "control" list for this pcb.
965: *
966: * The routine will be called from upper layer handlers like tcp6_input().
967: * Thus the routine assumes that the caller (tcp6_input) have already
968: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
969: * very first mbuf on the mbuf chain.
970: * We may want to add some infinite loop prevention or sanity checks for safety.
971: * (This applies only when you are using KAME mbuf chain restriction, i.e.
972: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 973: */
974: void
975: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 976: struct in6pcb *in6p;
977: struct mbuf **mp;
978: struct ip6_hdr *ip6;
979: struct mbuf *m;
1.2 itojun 980: {
981: struct proc *p = curproc; /* XXX */
1.9 itojun 982: int privileged;
1.2 itojun 983:
1.9 itojun 984: privileged = 0;
985: if (p && !suser(p->p_ucred, &p->p_acflag))
986: privileged++;
987:
988: #ifdef SO_TIMESTAMP
1.2 itojun 989: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
990: struct timeval tv;
991:
992: microtime(&tv);
993: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
994: SCM_TIMESTAMP, SOL_SOCKET);
995: if (*mp)
996: mp = &(*mp)->m_next;
997: }
1.9 itojun 998: #endif
1.2 itojun 999: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1000: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1001: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1002: IPPROTO_IPV6);
1003: if (*mp)
1004: mp = &(*mp)->m_next;
1005: }
1006:
1007: #ifdef noyet
1008: /* options were tossed above */
1009: if (in6p->in6p_flags & IN6P_RECVOPTS)
1010: /* broken */
1011: /* ip6_srcroute doesn't do what we want here, need to fix */
1012: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1013: /* broken */
1014: #endif
1015:
1016: /* RFC 2292 sec. 5 */
1.35 itojun 1017: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1018: struct in6_pktinfo pi6;
1019: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1020: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1021: pi6.ipi6_addr.s6_addr16[1] = 0;
1022: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1023: ? m->m_pkthdr.rcvif->if_index
1024: : 0;
1025: *mp = sbcreatecontrol((caddr_t) &pi6,
1026: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1027: IPPROTO_IPV6);
1028: if (*mp)
1029: mp = &(*mp)->m_next;
1030: }
1031: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1032: int hlim = ip6->ip6_hlim & 0xff;
1033: *mp = sbcreatecontrol((caddr_t) &hlim,
1034: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1035: if (*mp)
1036: mp = &(*mp)->m_next;
1037: }
1038: /* IN6P_NEXTHOP - for outgoing packet only */
1039:
1040: /*
1041: * IPV6_HOPOPTS socket option. We require super-user privilege
1042: * for the option, but it might be too strict, since there might
1043: * be some hop-by-hop options which can be returned to normal user.
1044: * See RFC 2292 section 6.
1045: */
1.35 itojun 1046: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1047: /*
1048: * Check if a hop-by-hop options header is contatined in the
1049: * received packet, and if so, store the options as ancillary
1050: * data. Note that a hop-by-hop options header must be
1051: * just after the IPv6 header, which fact is assured through
1052: * the IPv6 input processing.
1053: */
1054: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1055: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1056: struct ip6_hbh *hbh;
1057: int hbhlen;
1058:
1059: #ifndef PULLDOWN_TEST
1060: hbh = (struct ip6_hbh *)(ip6 + 1);
1061: hbhlen = (hbh->ip6h_len + 1) << 3;
1062: #else
1063: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1064: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1065: if (hbh == NULL) {
1066: ip6stat.ip6s_tooshort++;
1067: return;
1068: }
1069: hbhlen = (hbh->ip6h_len + 1) << 3;
1070: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1071: sizeof(struct ip6_hdr), hbhlen);
1072: if (hbh == NULL) {
1073: ip6stat.ip6s_tooshort++;
1074: return;
1075: }
1076: #endif
1.2 itojun 1077:
1078: /*
1079: * XXX: We copy whole the header even if a jumbo
1080: * payload option is included, which option is to
1081: * be removed before returning in the RFC 2292.
1082: * But it's too painful operation...
1083: */
1.9 itojun 1084: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1085: IPV6_HOPOPTS, IPPROTO_IPV6);
1086: if (*mp)
1087: mp = &(*mp)->m_next;
1088: }
1089: }
1090:
1091: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1092: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1093: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1094: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1095:
1096: /*
1097: * Search for destination options headers or routing
1098: * header(s) through the header chain, and stores each
1099: * header as ancillary data.
1100: * Note that the order of the headers remains in
1101: * the chain of ancillary data.
1102: */
1.35 itojun 1103: while (1) { /* is explicit loop prevention necessary? */
1.9 itojun 1104: struct ip6_ext *ip6e;
1105: int elen;
1106:
1107: #ifndef PULLDOWN_TEST
1108: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1109: if (nxt == IPPROTO_AH)
1110: elen = (ip6e->ip6e_len + 2) << 2;
1111: else
1112: elen = (ip6e->ip6e_len + 1) << 3;
1113: #else
1114: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1115: sizeof(struct ip6_ext));
1116: if (ip6e == NULL) {
1117: ip6stat.ip6s_tooshort++;
1118: return;
1119: }
1120: if (nxt == IPPROTO_AH)
1121: elen = (ip6e->ip6e_len + 2) << 2;
1122: else
1123: elen = (ip6e->ip6e_len + 1) << 3;
1124: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1125: if (ip6e == NULL) {
1126: ip6stat.ip6s_tooshort++;
1127: return;
1128: }
1129: #endif
1.2 itojun 1130:
1.35 itojun 1131: switch (nxt) {
1132: case IPPROTO_DSTOPTS:
1133: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1134: break;
1135:
1136: /*
1137: * We also require super-user privilege for
1138: * the option.
1139: * See the comments on IN6_HOPOPTS.
1140: */
1141: if (!privileged)
1142: break;
1143:
1144: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1145: IPV6_DSTOPTS,
1146: IPPROTO_IPV6);
1147: if (*mp)
1148: mp = &(*mp)->m_next;
1149: break;
1150:
1151: case IPPROTO_ROUTING:
1152: if (!in6p->in6p_flags & IN6P_RTHDR)
1153: break;
1154:
1155: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1156: IPV6_RTHDR,
1157: IPPROTO_IPV6);
1158: if (*mp)
1159: mp = &(*mp)->m_next;
1160: break;
1161:
1162: case IPPROTO_UDP:
1163: case IPPROTO_TCP:
1164: case IPPROTO_ICMPV6:
1165: default:
1166: /*
1167: * stop search if we encounter an upper
1168: * layer protocol headers.
1169: */
1170: goto loopend;
1171:
1172: case IPPROTO_HOPOPTS:
1173: case IPPROTO_AH: /* is it possible? */
1174: break;
1.2 itojun 1175: }
1176:
1177: /* proceed with the next header. */
1.9 itojun 1178: off += elen;
1.2 itojun 1179: nxt = ip6e->ip6e_nxt;
1180: }
1181: loopend:
1.36 cgd 1182: ;
1.2 itojun 1183: }
1.9 itojun 1184: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1185: /* to be done */
1186: }
1.9 itojun 1187: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1188: /* to be done */
1189: }
1190: /* IN6P_RTHDR - to be done */
1191:
1192: }
1193:
1194: /*
1195: * Get pointer to the previous header followed by the header
1196: * currently processed.
1197: * XXX: This function supposes that
1198: * M includes all headers,
1199: * the next header field and the header length field of each header
1200: * are valid, and
1201: * the sum of each header length equals to OFF.
1202: * Because of these assumptions, this function must be called very
1203: * carefully. Moreover, it will not be used in the near future when
1204: * we develop `neater' mechanism to process extension headers.
1205: */
1206: char *
1207: ip6_get_prevhdr(m, off)
1208: struct mbuf *m;
1209: int off;
1210: {
1211: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1212:
1213: if (off == sizeof(struct ip6_hdr))
1214: return(&ip6->ip6_nxt);
1215: else {
1216: int len, nxt;
1217: struct ip6_ext *ip6e = NULL;
1218:
1219: nxt = ip6->ip6_nxt;
1220: len = sizeof(struct ip6_hdr);
1221: while (len < off) {
1222: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1223:
1.35 itojun 1224: switch (nxt) {
1.2 itojun 1225: case IPPROTO_FRAGMENT:
1226: len += sizeof(struct ip6_frag);
1227: break;
1228: case IPPROTO_AH:
1229: len += (ip6e->ip6e_len + 2) << 2;
1230: break;
1231: default:
1232: len += (ip6e->ip6e_len + 1) << 3;
1233: break;
1234: }
1235: nxt = ip6e->ip6e_nxt;
1236: }
1237: if (ip6e)
1238: return(&ip6e->ip6e_nxt);
1239: else
1240: return NULL;
1.18 itojun 1241: }
1242: }
1243:
1244: /*
1245: * get next header offset. m will be retained.
1246: */
1247: int
1248: ip6_nexthdr(m, off, proto, nxtp)
1249: struct mbuf *m;
1250: int off;
1251: int proto;
1252: int *nxtp;
1253: {
1254: struct ip6_hdr ip6;
1255: struct ip6_ext ip6e;
1256: struct ip6_frag fh;
1257:
1258: /* just in case */
1259: if (m == NULL)
1260: panic("ip6_nexthdr: m == NULL");
1261: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1262: return -1;
1263:
1264: switch (proto) {
1265: case IPPROTO_IPV6:
1266: if (m->m_pkthdr.len < off + sizeof(ip6))
1267: return -1;
1268: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1269: if (nxtp)
1270: *nxtp = ip6.ip6_nxt;
1271: off += sizeof(ip6);
1272: return off;
1273:
1274: case IPPROTO_FRAGMENT:
1275: /*
1276: * terminate parsing if it is not the first fragment,
1277: * it does not make sense to parse through it.
1278: */
1279: if (m->m_pkthdr.len < off + sizeof(fh))
1280: return -1;
1281: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1282: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1283: return -1;
1284: if (nxtp)
1285: *nxtp = fh.ip6f_nxt;
1286: off += sizeof(struct ip6_frag);
1287: return off;
1288:
1289: case IPPROTO_AH:
1290: if (m->m_pkthdr.len < off + sizeof(ip6e))
1291: return -1;
1292: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1293: if (nxtp)
1294: *nxtp = ip6e.ip6e_nxt;
1295: off += (ip6e.ip6e_len + 2) << 2;
1296: return off;
1297:
1298: case IPPROTO_HOPOPTS:
1299: case IPPROTO_ROUTING:
1300: case IPPROTO_DSTOPTS:
1301: if (m->m_pkthdr.len < off + sizeof(ip6e))
1302: return -1;
1303: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1304: if (nxtp)
1305: *nxtp = ip6e.ip6e_nxt;
1306: off += (ip6e.ip6e_len + 1) << 3;
1307: return off;
1308:
1309: case IPPROTO_NONE:
1310: case IPPROTO_ESP:
1311: case IPPROTO_IPCOMP:
1312: /* give up */
1313: return -1;
1314:
1315: default:
1316: return -1;
1317: }
1318:
1319: return -1;
1320: }
1321:
1322: /*
1323: * get offset for the last header in the chain. m will be kept untainted.
1324: */
1325: int
1326: ip6_lasthdr(m, off, proto, nxtp)
1327: struct mbuf *m;
1328: int off;
1329: int proto;
1330: int *nxtp;
1331: {
1332: int newoff;
1333: int nxt;
1334:
1335: if (!nxtp) {
1336: nxt = -1;
1337: nxtp = &nxt;
1338: }
1339: while (1) {
1340: newoff = ip6_nexthdr(m, off, proto, nxtp);
1341: if (newoff < 0)
1342: return off;
1343: else if (newoff < off)
1344: return -1; /* invalid */
1345: else if (newoff == off)
1346: return newoff;
1347:
1348: off = newoff;
1349: proto = *nxtp;
1.2 itojun 1350: }
1351: }
1352:
1353: /*
1354: * System control for IP6
1355: */
1356:
1357: u_char inet6ctlerrmap[PRC_NCMDS] = {
1358: 0, 0, 0, 0,
1359: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1360: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1361: EMSGSIZE, EHOSTUNREACH, 0, 0,
1362: 0, 0, 0, 0,
1363: ENOPROTOOPT
1364: };
1365:
1.23 mrg 1366: #include <uvm/uvm_extern.h>
1.2 itojun 1367: #include <sys/sysctl.h>
1368:
1369: int
1370: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1371: int *name;
1372: u_int namelen;
1373: void *oldp;
1374: size_t *oldlenp;
1375: void *newp;
1376: size_t newlen;
1377: {
1.26 itojun 1378: int old, error;
1379:
1.2 itojun 1380: /* All sysctl names at this level are terminal. */
1381: if (namelen != 1)
1382: return ENOTDIR;
1383:
1384: switch (name[0]) {
1385:
1386: case IPV6CTL_FORWARDING:
1387: return sysctl_int(oldp, oldlenp, newp, newlen,
1388: &ip6_forwarding);
1389: case IPV6CTL_SENDREDIRECTS:
1390: return sysctl_int(oldp, oldlenp, newp, newlen,
1391: &ip6_sendredirects);
1392: case IPV6CTL_DEFHLIM:
1393: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1394: case IPV6CTL_MAXFRAGPACKETS:
1395: return sysctl_int(oldp, oldlenp, newp, newlen,
1396: &ip6_maxfragpackets);
1397: case IPV6CTL_ACCEPT_RTADV:
1398: return sysctl_int(oldp, oldlenp, newp, newlen,
1399: &ip6_accept_rtadv);
1400: case IPV6CTL_KEEPFAITH:
1401: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1402: case IPV6CTL_LOG_INTERVAL:
1403: return sysctl_int(oldp, oldlenp, newp, newlen,
1404: &ip6_log_interval);
1405: case IPV6CTL_HDRNESTLIMIT:
1406: return sysctl_int(oldp, oldlenp, newp, newlen,
1407: &ip6_hdrnestlimit);
1408: case IPV6CTL_DAD_COUNT:
1409: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1410: case IPV6CTL_AUTO_FLOWLABEL:
1411: return sysctl_int(oldp, oldlenp, newp, newlen,
1412: &ip6_auto_flowlabel);
1413: case IPV6CTL_DEFMCASTHLIM:
1414: return sysctl_int(oldp, oldlenp, newp, newlen,
1415: &ip6_defmcasthlim);
1416: case IPV6CTL_GIF_HLIM:
1417: return sysctl_int(oldp, oldlenp, newp, newlen,
1418: &ip6_gif_hlim);
1419: case IPV6CTL_KAME_VERSION:
1420: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1421: case IPV6CTL_USE_DEPRECATED:
1422: return sysctl_int(oldp, oldlenp, newp, newlen,
1423: &ip6_use_deprecated);
1.10 itojun 1424: case IPV6CTL_RR_PRUNE:
1425: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1426: #ifndef INET6_BINDV6ONLY
1.11 itojun 1427: case IPV6CTL_BINDV6ONLY:
1428: return sysctl_int(oldp, oldlenp, newp, newlen,
1429: &ip6_bindv6only);
1.26 itojun 1430: #endif
1431: case IPV6CTL_ANONPORTMIN:
1432: old = ip6_anonportmin;
1433: error = sysctl_int(oldp, oldlenp, newp, newlen,
1434: &ip6_anonportmin);
1435: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1436: ip6_anonportmin > 65535
1437: #ifndef IPNOPRIVPORTS
1438: || ip6_anonportmin < IPV6PORT_RESERVED
1439: #endif
1440: ) {
1441: ip6_anonportmin = old;
1442: return (EINVAL);
1443: }
1444: return (error);
1445: case IPV6CTL_ANONPORTMAX:
1446: old = ip6_anonportmax;
1447: error = sysctl_int(oldp, oldlenp, newp, newlen,
1448: &ip6_anonportmax);
1449: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1450: ip6_anonportmax > 65535
1451: #ifndef IPNOPRIVPORTS
1452: || ip6_anonportmax < IPV6PORT_RESERVED
1453: #endif
1454: ) {
1455: ip6_anonportmax = old;
1456: return (EINVAL);
1457: }
1458: return (error);
1459: #ifndef IPNOPRIVPORTS
1460: case IPV6CTL_LOWPORTMIN:
1461: old = ip6_lowportmin;
1462: error = sysctl_int(oldp, oldlenp, newp, newlen,
1463: &ip6_lowportmin);
1464: if (ip6_lowportmin >= ip6_lowportmax ||
1465: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1466: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1467: ip6_lowportmin = old;
1468: return (EINVAL);
1469: }
1470: return (error);
1471: case IPV6CTL_LOWPORTMAX:
1472: old = ip6_lowportmax;
1473: error = sysctl_int(oldp, oldlenp, newp, newlen,
1474: &ip6_lowportmax);
1475: if (ip6_lowportmin >= ip6_lowportmax ||
1476: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1477: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1478: ip6_lowportmax = old;
1479: return (EINVAL);
1480: }
1481: return (error);
1.11 itojun 1482: #endif
1.2 itojun 1483: default:
1484: return EOPNOTSUPP;
1485: }
1486: /* NOTREACHED */
1487: }
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