Annotation of src/sys/netinet6/ip6_input.c, Revision 1.64
1.64 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.63 2003/05/14 14:41:33 itojun Exp $ */
1.40 itojun 2: /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 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: */
1.48 lukem 67:
68: #include <sys/cdefs.h>
1.64 ! itojun 69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.63 2003/05/14 14:41:33 itojun Exp $");
1.2 itojun 70:
71: #include "opt_inet.h"
1.4 thorpej 72: #include "opt_ipsec.h"
1.15 darrenr 73: #include "opt_pfil_hooks.h"
1.2 itojun 74:
75: #include <sys/param.h>
76: #include <sys/systm.h>
77: #include <sys/malloc.h>
78: #include <sys/mbuf.h>
79: #include <sys/domain.h>
80: #include <sys/protosw.h>
81: #include <sys/socket.h>
82: #include <sys/socketvar.h>
83: #include <sys/errno.h>
84: #include <sys/time.h>
85: #include <sys/kernel.h>
86: #include <sys/syslog.h>
87: #include <sys/proc.h>
1.46 simonb 88: #include <sys/sysctl.h>
1.2 itojun 89:
90: #include <net/if.h>
91: #include <net/if_types.h>
92: #include <net/if_dl.h>
93: #include <net/route.h>
94: #include <net/netisr.h>
1.15 darrenr 95: #ifdef PFIL_HOOKS
96: #include <net/pfil.h>
97: #endif
1.2 itojun 98:
99: #include <netinet/in.h>
1.9 itojun 100: #include <netinet/in_systm.h>
101: #ifdef INET
102: #include <netinet/ip.h>
103: #include <netinet/ip_icmp.h>
1.45 itojun 104: #endif /* INET */
1.14 itojun 105: #include <netinet/ip6.h>
1.2 itojun 106: #include <netinet6/in6_var.h>
1.11 itojun 107: #include <netinet6/ip6_var.h>
1.2 itojun 108: #include <netinet6/in6_pcb.h>
1.14 itojun 109: #include <netinet/icmp6.h>
1.2 itojun 110: #include <netinet6/in6_ifattach.h>
111: #include <netinet6/nd6.h>
112:
1.37 itojun 113: #ifdef IPSEC
114: #include <netinet6/ipsec.h>
115: #endif
116:
1.2 itojun 117: #include <netinet6/ip6protosw.h>
118:
119: /* we need it for NLOOP. */
120: #include "loop.h"
121: #include "faith.h"
122: #include "gif.h"
123: #include "bpfilter.h"
1.50 itojun 124:
125: #if NGIF > 0
126: #include <netinet6/in6_gif.h>
127: #endif
1.2 itojun 128:
1.9 itojun 129: #include <net/net_osdep.h>
130:
1.2 itojun 131: extern struct domain inet6domain;
132:
133: u_char ip6_protox[IPPROTO_MAX];
134: static int ip6qmaxlen = IFQ_MAXLEN;
135: struct in6_ifaddr *in6_ifaddr;
136: struct ifqueue ip6intrq;
137:
138: extern struct ifnet loif[NLOOP];
139: int ip6_forward_srcrt; /* XXX */
140: int ip6_sourcecheck; /* XXX */
141: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 142:
1.29 thorpej 143: #ifdef PFIL_HOOKS
144: struct pfil_head inet6_pfil_hook;
145: #endif
146:
1.2 itojun 147: struct ip6stat ip6stat;
148:
149: static void ip6_init2 __P((void *));
150:
1.5 itojun 151: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62 itojun 152: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2 itojun 153:
154: /*
155: * IP6 initialization: fill in IP6 protocol switch table.
156: * All protocols not implemented in kernel go to raw IP6 protocol handler.
157: */
158: void
159: ip6_init()
160: {
1.35 itojun 161: struct ip6protosw *pr;
162: int i;
1.2 itojun 163:
164: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
165: if (pr == 0)
166: panic("ip6_init");
167: for (i = 0; i < IPPROTO_MAX; i++)
168: ip6_protox[i] = pr - inet6sw;
169: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
170: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
171: if (pr->pr_domain->dom_family == PF_INET6 &&
172: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
173: ip6_protox[pr->pr_protocol] = pr - inet6sw;
174: ip6intrq.ifq_maxlen = ip6qmaxlen;
175: nd6_init();
176: frag6_init();
1.54 itojun 177: ip6_flow_seq = arc4random();
1.2 itojun 178:
179: ip6_init2((void *)0);
1.29 thorpej 180:
181: #ifdef PFIL_HOOKS
182: /* Register our Packet Filter hook. */
1.33 thorpej 183: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
184: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 185: i = pfil_head_register(&inet6_pfil_hook);
186: if (i != 0)
187: printf("ip6_init: WARNING: unable to register pfil hook, "
188: "error %d\n", i);
189: #endif /* PFIL_HOOKS */
1.2 itojun 190: }
191:
192: static void
193: ip6_init2(dummy)
194: void *dummy;
195: {
196:
197: /* nd6_timer_init */
1.19 thorpej 198: callout_init(&nd6_timer_ch);
199: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2 itojun 200: }
201:
202: /*
203: * IP6 input interrupt handling. Just pass the packet to ip6_input.
204: */
205: void
206: ip6intr()
207: {
208: int s;
209: struct mbuf *m;
210:
211: for (;;) {
1.41 thorpej 212: s = splnet();
1.2 itojun 213: IF_DEQUEUE(&ip6intrq, m);
214: splx(s);
215: if (m == 0)
216: return;
217: ip6_input(m);
218: }
219: }
220:
221: extern struct route_in6 ip6_forward_rt;
222:
223: void
224: ip6_input(m)
225: struct mbuf *m;
226: {
1.9 itojun 227: struct ip6_hdr *ip6;
1.2 itojun 228: int off = sizeof(struct ip6_hdr), nest;
229: u_int32_t plen;
1.5 itojun 230: u_int32_t rtalert = ~0;
1.2 itojun 231: int nxt, ours = 0;
1.9 itojun 232: struct ifnet *deliverifp = NULL;
1.64 ! itojun 233: int srcrt = 0;
1.2 itojun 234:
235: #ifdef IPSEC
236: /*
237: * should the inner packet be considered authentic?
238: * see comment in ah4_input().
239: */
1.49 itojun 240: m->m_flags &= ~M_AUTHIPHDR;
241: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 242: #endif
1.9 itojun 243:
1.2 itojun 244: /*
1.44 itojun 245: * mbuf statistics
1.2 itojun 246: */
247: if (m->m_flags & M_EXT) {
248: if (m->m_next)
249: ip6stat.ip6s_mext2m++;
250: else
251: ip6stat.ip6s_mext1++;
252: } else {
1.40 itojun 253: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 254: if (m->m_next) {
1.9 itojun 255: if (m->m_flags & M_LOOP) {
1.44 itojun 256: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 257: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 258: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
259: else
260: ip6stat.ip6s_m2m[0]++;
261: } else
262: ip6stat.ip6s_m1++;
1.40 itojun 263: #undef M2MMAX
1.2 itojun 264: }
265:
1.9 itojun 266: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
267: ip6stat.ip6s_total++;
268:
1.57 thorpej 269: /*
270: * If the IPv6 header is not aligned, slurp it up into a new
271: * mbuf with space for link headers, in the event we forward
272: * it. OTherwise, if it is aligned, make sure the entire base
273: * IPv6 header is in the first mbuf of the chain.
274: */
275: if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
276: struct ifnet *inifp = m->m_pkthdr.rcvif;
277: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
278: (max_linkhdr + 3) & ~3)) == NULL) {
279: /* XXXJRT new stat, please */
280: ip6stat.ip6s_toosmall++;
281: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
282: return;
283: }
284: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
285: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 286: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9 itojun 287: ip6stat.ip6s_toosmall++;
288: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
289: return;
290: }
1.2 itojun 291: }
292:
293: ip6 = mtod(m, struct ip6_hdr *);
294:
295: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
296: ip6stat.ip6s_badvers++;
1.9 itojun 297: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 298: goto bad;
299: }
1.15 darrenr 300:
301: #ifdef PFIL_HOOKS
302: /*
303: * Run through list of hooks for input packets. If there are any
304: * filters which require that additional packets in the flow are
305: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
306: * Note that filters must _never_ set this flag, as another filter
307: * in the list may have previously cleared it.
308: */
1.39 itojun 309: /*
310: * let ipfilter look at packet on the wire,
311: * not the decapsulated packet.
312: */
313: #ifdef IPSEC
1.42 itojun 314: if (!ipsec_getnhist(m))
1.39 itojun 315: #else
316: if (1)
317: #endif
318: {
1.64 ! itojun 319: struct in6_addr odst;
! 320:
! 321: odst = ip6->ip6_dst;
1.39 itojun 322: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
323: PFIL_IN) != 0)
324: return;
325: if (m == NULL)
326: return;
327: ip6 = mtod(m, struct ip6_hdr *);
1.64 ! itojun 328: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 329: }
1.15 darrenr 330: #endif /* PFIL_HOOKS */
331:
1.2 itojun 332: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
333:
1.30 thorpej 334: #ifdef ALTQ
335: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
336: /* packet is dropped by traffic conditioner */
337: return;
1.9 itojun 338: }
339: #endif
340:
1.2 itojun 341: /*
1.44 itojun 342: * Check against address spoofing/corruption.
1.2 itojun 343: */
344: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
345: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 346: /*
347: * XXX: "badscope" is not very suitable for a multicast source.
348: */
1.2 itojun 349: ip6stat.ip6s_badscope++;
1.9 itojun 350: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 351: goto bad;
352: }
1.13 itojun 353: /*
1.44 itojun 354: * The following check is not documented in specs. A malicious
355: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
356: * and bypass security checks (act as if it was from 127.0.0.1 by using
357: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 358: *
1.44 itojun 359: * This check chokes if we are in an SIIT cloud. As none of BSDs
360: * support IPv4-less kernel compilation, we cannot support SIIT
361: * environment at all. So, it makes more sense for us to reject any
362: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 363: * partial support for SIIT environment.
1.13 itojun 364: */
365: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
366: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
367: ip6stat.ip6s_badscope++;
368: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
369: goto bad;
370: }
1.17 itojun 371: #if 0
1.13 itojun 372: /*
1.17 itojun 373: * Reject packets with IPv4 compatible addresses (auto tunnel).
374: *
375: * The code forbids auto tunnel relay case in RFC1933 (the check is
376: * stronger than RFC1933). We may want to re-enable it if mech-xx
377: * is revised to forbid relaying case.
1.13 itojun 378: */
379: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
380: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
381: ip6stat.ip6s_badscope++;
382: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
383: goto bad;
384: }
385: #endif
1.35 itojun 386:
1.2 itojun 387: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
388: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
389: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
390: ours = 1;
1.9 itojun 391: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 392: goto hbhcheck;
393: } else {
394: ip6stat.ip6s_badscope++;
1.9 itojun 395: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 396: goto bad;
397: }
398: }
399:
1.38 itojun 400: /* drop packets if interface ID portion is already filled */
401: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
402: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
403: ip6->ip6_src.s6_addr16[1]) {
404: ip6stat.ip6s_badscope++;
405: goto bad;
406: }
407: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
408: ip6->ip6_dst.s6_addr16[1]) {
409: ip6stat.ip6s_badscope++;
410: goto bad;
411: }
412: }
1.2 itojun 413:
1.40 itojun 414: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
415: ip6->ip6_src.s6_addr16[1]
416: = htons(m->m_pkthdr.rcvif->if_index);
417: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
418: ip6->ip6_dst.s6_addr16[1]
419: = htons(m->m_pkthdr.rcvif->if_index);
420:
421: /*
422: * We use rt->rt_ifp to determine if the address is ours or not.
423: * If rt_ifp is lo0, the address is ours.
424: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
425: * so any address under fe80::%lo0/64 will be mistakenly considered
426: * local. The special case is supplied to handle the case properly
427: * by actually looking at interface addresses
428: * (using in6ifa_ifpwithaddr).
429: */
430: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
431: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
432: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
433: icmp6_error(m, ICMP6_DST_UNREACH,
434: ICMP6_DST_UNREACH_ADDR, 0);
435: /* m is already freed */
436: return;
1.21 itojun 437: }
1.40 itojun 438:
439: ours = 1;
440: deliverifp = m->m_pkthdr.rcvif;
441: goto hbhcheck;
1.9 itojun 442: }
443:
1.2 itojun 444: /*
445: * Multicast check
446: */
447: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
448: struct in6_multi *in6m = 0;
1.9 itojun 449:
450: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 451: /*
452: * See if we belong to the destination multicast group on the
453: * arrival interface.
454: */
455: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
456: if (in6m)
457: ours = 1;
458: else if (!ip6_mrouter) {
459: ip6stat.ip6s_notmember++;
460: ip6stat.ip6s_cantforward++;
1.9 itojun 461: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 462: goto bad;
463: }
1.9 itojun 464: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 465: goto hbhcheck;
466: }
467:
468: /*
469: * Unicast check
470: */
1.22 itojun 471: if (ip6_forward_rt.ro_rt != NULL &&
1.55 itojun 472: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22 itojun 473: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 474: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 475: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 476: else {
1.35 itojun 477: struct sockaddr_in6 *dst6;
478:
1.2 itojun 479: if (ip6_forward_rt.ro_rt) {
1.22 itojun 480: /* route is down or destination is different */
1.25 itojun 481: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 482: RTFREE(ip6_forward_rt.ro_rt);
483: ip6_forward_rt.ro_rt = 0;
484: }
1.22 itojun 485:
1.2 itojun 486: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 487: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
488: dst6->sin6_len = sizeof(struct sockaddr_in6);
489: dst6->sin6_family = AF_INET6;
490: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 491:
1.9 itojun 492: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 493: }
494:
495: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
496:
497: /*
498: * Accept the packet if the forwarding interface to the destination
499: * according to the routing table is the loopback interface,
500: * unless the associated route has a gateway.
501: * Note that this approach causes to accept a packet if there is a
502: * route to the loopback interface for the destination of the packet.
503: * But we think it's even useful in some situations, e.g. when using
504: * a special daemon which wants to intercept the packet.
505: */
506: if (ip6_forward_rt.ro_rt &&
507: (ip6_forward_rt.ro_rt->rt_flags &
508: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55 itojun 509: !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2 itojun 510: #if 0
511: /*
512: * The check below is redundant since the comparison of
513: * the destination and the key of the rtentry has
514: * already done through looking up the routing table.
515: */
516: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55 itojun 517: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2 itojun 518: #endif
1.9 itojun 519: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 520: struct in6_ifaddr *ia6 =
521: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
522: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
523: m->m_flags |= M_ANYCAST6;
1.24 itojun 524: /*
525: * packets to a tentative, duplicated, or somehow invalid
526: * address must not be accepted.
527: */
1.2 itojun 528: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 529: /* this address is ready */
1.2 itojun 530: ours = 1;
1.9 itojun 531: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 532: goto hbhcheck;
533: } else {
1.24 itojun 534: /* address is not ready, so discard the packet. */
1.34 itojun 535: nd6log((LOG_INFO,
1.27 itojun 536: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 537: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 538: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 539:
540: goto bad;
1.2 itojun 541: }
542: }
543:
544: /*
1.55 itojun 545: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 546: */
547: #if defined(NFAITH) && 0 < NFAITH
548: if (ip6_keepfaith) {
549: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
550: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
551: /* XXX do we need more sanity checks? */
552: ours = 1;
1.45 itojun 553: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 554: goto hbhcheck;
555: }
556: }
557: #endif
558:
559: #if 0
560: {
561: /*
562: * Last resort: check in6_ifaddr for incoming interface.
563: * The code is here until I update the "goto ours hack" code above
564: * working right.
565: */
566: struct ifaddr *ifa;
567: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
568: ifa;
569: ifa = ifa->ifa_list.tqe_next) {
570: if (ifa->ifa_addr == NULL)
571: continue; /* just for safety */
572: if (ifa->ifa_addr->sa_family != AF_INET6)
573: continue;
574: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
575: ours = 1;
576: deliverifp = ifa->ifa_ifp;
1.2 itojun 577: goto hbhcheck;
578: }
579: }
1.9 itojun 580: }
1.2 itojun 581: #endif
582:
583: /*
584: * Now there is no reason to process the packet if it's not our own
585: * and we're not a router.
586: */
587: if (!ip6_forwarding) {
588: ip6stat.ip6s_cantforward++;
1.9 itojun 589: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 590: goto bad;
591: }
592:
593: hbhcheck:
594: /*
595: * Process Hop-by-Hop options header if it's contained.
596: * m may be modified in ip6_hopopts_input().
597: * If a JumboPayload option is included, plen will also be modified.
598: */
599: plen = (u_int32_t)ntohs(ip6->ip6_plen);
600: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 601: struct ip6_hbh *hbh;
602:
603: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
604: #if 0 /*touches NULL pointer*/
605: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
606: #endif
1.2 itojun 607: return; /* m have already been freed */
1.9 itojun 608: }
1.22 itojun 609:
1.2 itojun 610: /* adjust pointer */
611: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 612:
613: /*
1.49 itojun 614: * if the payload length field is 0 and the next header field
1.22 itojun 615: * indicates Hop-by-Hop Options header, then a Jumbo Payload
616: * option MUST be included.
617: */
618: if (ip6->ip6_plen == 0 && plen == 0) {
619: /*
620: * Note that if a valid jumbo payload option is
621: * contained, ip6_hoptops_input() must set a valid
1.55 itojun 622: * (non-zero) payload length to the variable plen.
1.22 itojun 623: */
624: ip6stat.ip6s_badoptions++;
625: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
626: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
627: icmp6_error(m, ICMP6_PARAM_PROB,
628: ICMP6_PARAMPROB_HEADER,
629: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
630: return;
631: }
1.9 itojun 632: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
633: sizeof(struct ip6_hbh));
634: if (hbh == NULL) {
635: ip6stat.ip6s_tooshort++;
636: return;
637: }
1.57 thorpej 638: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 639: nxt = hbh->ip6h_nxt;
1.2 itojun 640:
641: /*
642: * accept the packet if a router alert option is included
643: * and we act as an IPv6 router.
644: */
1.5 itojun 645: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 646: ours = 1;
647: } else
648: nxt = ip6->ip6_nxt;
649:
650: /*
651: * Check that the amount of data in the buffers
652: * is as at least much as the IPv6 header would have us expect.
653: * Trim mbufs if longer than we expect.
654: * Drop packet if shorter than we expect.
655: */
656: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
657: ip6stat.ip6s_tooshort++;
1.9 itojun 658: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 659: goto bad;
660: }
661: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
662: if (m->m_len == m->m_pkthdr.len) {
663: m->m_len = sizeof(struct ip6_hdr) + plen;
664: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
665: } else
666: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
667: }
668:
669: /*
670: * Forward if desirable.
671: */
672: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
673: /*
674: * If we are acting as a multicast router, all
675: * incoming multicast packets are passed to the
676: * kernel-level multicast forwarding function.
677: * The packet is returned (relatively) intact; if
678: * ip6_mforward() returns a non-zero value, the packet
679: * must be discarded, else it may be accepted below.
680: */
681: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
682: ip6stat.ip6s_cantforward++;
683: m_freem(m);
684: return;
685: }
686: if (!ours) {
687: m_freem(m);
688: return;
689: }
1.22 itojun 690: } else if (!ours) {
1.64 ! itojun 691: ip6_forward(m, srcrt);
1.2 itojun 692: return;
1.56 itojun 693: }
1.25 itojun 694:
695: ip6 = mtod(m, struct ip6_hdr *);
696:
697: /*
698: * Malicious party may be able to use IPv4 mapped addr to confuse
699: * tcp/udp stack and bypass security checks (act as if it was from
700: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
701: *
702: * For SIIT end node behavior, you may want to disable the check.
703: * However, you will become vulnerable to attacks using IPv4 mapped
704: * source.
705: */
706: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
707: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
708: ip6stat.ip6s_badscope++;
709: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
710: goto bad;
711: }
1.2 itojun 712:
713: /*
714: * Tell launch routine the next header
715: */
1.12 itojun 716: #ifdef IFA_STATS
1.28 itojun 717: if (deliverifp != NULL) {
1.9 itojun 718: struct in6_ifaddr *ia6;
719: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
720: if (ia6)
721: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
722: }
723: #endif
1.2 itojun 724: ip6stat.ip6s_delivered++;
1.9 itojun 725: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 726: nest = 0;
1.40 itojun 727:
1.2 itojun 728: while (nxt != IPPROTO_DONE) {
729: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
730: ip6stat.ip6s_toomanyhdr++;
731: goto bad;
732: }
1.8 itojun 733:
734: /*
735: * protection against faulty packet - there should be
736: * more sanity checks in header chain processing.
737: */
738: if (m->m_pkthdr.len < off) {
739: ip6stat.ip6s_tooshort++;
1.9 itojun 740: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 741: goto bad;
742: }
743:
1.37 itojun 744: #ifdef IPSEC
745: /*
746: * enforce IPsec policy checking if we are seeing last header.
747: * note that we do not visit this with protocols with pcb layer
748: * code - like udp/tcp/raw ip.
749: */
750: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
751: ipsec6_in_reject(m, NULL)) {
752: ipsec6stat.in_polvio++;
753: goto bad;
754: }
755: #endif
1.56 itojun 756:
1.2 itojun 757: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
758: }
759: return;
760: bad:
761: m_freem(m);
762: }
763:
764: /*
765: * Hop-by-Hop options header processing. If a valid jumbo payload option is
766: * included, the real payload length will be stored in plenp.
767: */
768: static int
769: ip6_hopopts_input(plenp, rtalertp, mp, offp)
770: u_int32_t *plenp;
1.5 itojun 771: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 772: struct mbuf **mp;
773: int *offp;
774: {
1.35 itojun 775: struct mbuf *m = *mp;
1.2 itojun 776: int off = *offp, hbhlen;
777: struct ip6_hbh *hbh;
778: u_int8_t *opt;
779:
780: /* validation of the length of the header */
1.9 itojun 781: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
782: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
783: if (hbh == NULL) {
784: ip6stat.ip6s_tooshort++;
785: return -1;
786: }
787: hbhlen = (hbh->ip6h_len + 1) << 3;
788: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
789: hbhlen);
790: if (hbh == NULL) {
791: ip6stat.ip6s_tooshort++;
792: return -1;
793: }
1.57 thorpej 794: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 795: off += hbhlen;
796: hbhlen -= sizeof(struct ip6_hbh);
797: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
798:
799: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
800: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 801: return (-1);
1.2 itojun 802:
803: *offp = off;
804: *mp = m;
1.58 itojun 805: return (0);
1.2 itojun 806: }
807:
808: /*
809: * Search header for all Hop-by-hop options and process each option.
810: * This function is separate from ip6_hopopts_input() in order to
811: * handle a case where the sending node itself process its hop-by-hop
812: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 813: *
814: * The function assumes that hbh header is located right after the IPv6 header
815: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
816: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 817: */
818: int
819: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
820: struct mbuf *m;
821: u_int8_t *opthead;
822: int hbhlen;
1.5 itojun 823: u_int32_t *rtalertp;
1.2 itojun 824: u_int32_t *plenp;
825: {
826: struct ip6_hdr *ip6;
827: int optlen = 0;
828: u_int8_t *opt = opthead;
829: u_int16_t rtalert_val;
1.22 itojun 830: u_int32_t jumboplen;
1.55 itojun 831: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 832:
833: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 834: switch (*opt) {
835: case IP6OPT_PAD1:
836: optlen = 1;
837: break;
838: case IP6OPT_PADN:
839: if (hbhlen < IP6OPT_MINLEN) {
840: ip6stat.ip6s_toosmall++;
841: goto bad;
842: }
843: optlen = *(opt + 1) + 2;
844: break;
845: case IP6OPT_RTALERT:
846: /* XXX may need check for alignment */
847: if (hbhlen < IP6OPT_RTALERT_LEN) {
848: ip6stat.ip6s_toosmall++;
849: goto bad;
850: }
851: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 852: /* XXX stat */
853: icmp6_error(m, ICMP6_PARAM_PROB,
854: ICMP6_PARAMPROB_HEADER,
855: erroff + opt + 1 - opthead);
856: return (-1);
1.35 itojun 857: }
858: optlen = IP6OPT_RTALERT_LEN;
859: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
860: *rtalertp = ntohs(rtalert_val);
861: break;
862: case IP6OPT_JUMBO:
1.22 itojun 863: /* XXX may need check for alignment */
864: if (hbhlen < IP6OPT_JUMBO_LEN) {
865: ip6stat.ip6s_toosmall++;
866: goto bad;
867: }
1.35 itojun 868: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 869: /* XXX stat */
870: icmp6_error(m, ICMP6_PARAM_PROB,
871: ICMP6_PARAMPROB_HEADER,
872: erroff + opt + 1 - opthead);
873: return (-1);
1.35 itojun 874: }
1.22 itojun 875: optlen = IP6OPT_JUMBO_LEN;
876:
877: /*
878: * IPv6 packets that have non 0 payload length
1.35 itojun 879: * must not contain a jumbo payload option.
1.22 itojun 880: */
881: ip6 = mtod(m, struct ip6_hdr *);
882: if (ip6->ip6_plen) {
883: ip6stat.ip6s_badoptions++;
884: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 885: ICMP6_PARAMPROB_HEADER,
886: erroff + opt - opthead);
887: return (-1);
1.22 itojun 888: }
1.2 itojun 889:
1.22 itojun 890: /*
891: * We may see jumbolen in unaligned location, so
892: * we'd need to perform bcopy().
893: */
894: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
895: jumboplen = (u_int32_t)htonl(jumboplen);
896:
897: #if 1
898: /*
899: * if there are multiple jumbo payload options,
900: * *plenp will be non-zero and the packet will be
901: * rejected.
902: * the behavior may need some debate in ipngwg -
903: * multiple options does not make sense, however,
904: * there's no explicit mention in specification.
905: */
906: if (*plenp != 0) {
907: ip6stat.ip6s_badoptions++;
908: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 909: ICMP6_PARAMPROB_HEADER,
910: erroff + opt + 2 - opthead);
911: return (-1);
1.22 itojun 912: }
1.8 itojun 913: #endif
1.2 itojun 914:
1.22 itojun 915: /*
916: * jumbo payload length must be larger than 65535.
917: */
918: if (jumboplen <= IPV6_MAXPACKET) {
919: ip6stat.ip6s_badoptions++;
920: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 921: ICMP6_PARAMPROB_HEADER,
922: erroff + opt + 2 - opthead);
923: return (-1);
1.22 itojun 924: }
925: *plenp = jumboplen;
926:
927: break;
1.35 itojun 928: default: /* unknown option */
929: if (hbhlen < IP6OPT_MINLEN) {
930: ip6stat.ip6s_toosmall++;
931: goto bad;
932: }
1.55 itojun 933: optlen = ip6_unknown_opt(opt, m,
934: erroff + opt - opthead);
935: if (optlen == -1)
936: return (-1);
1.35 itojun 937: optlen += 2;
938: break;
1.2 itojun 939: }
940: }
941:
1.55 itojun 942: return (0);
1.2 itojun 943:
944: bad:
945: m_freem(m);
1.55 itojun 946: return (-1);
1.2 itojun 947: }
948:
949: /*
950: * Unknown option processing.
951: * The third argument `off' is the offset from the IPv6 header to the option,
952: * which is necessary if the IPv6 header the and option header and IPv6 header
953: * is not continuous in order to return an ICMPv6 error.
954: */
955: int
956: ip6_unknown_opt(optp, m, off)
957: u_int8_t *optp;
958: struct mbuf *m;
959: int off;
960: {
961: struct ip6_hdr *ip6;
962:
1.35 itojun 963: switch (IP6OPT_TYPE(*optp)) {
964: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 965: return ((int)*(optp + 1));
1.35 itojun 966: case IP6OPT_TYPE_DISCARD: /* silently discard */
967: m_freem(m);
1.58 itojun 968: return (-1);
1.35 itojun 969: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
970: ip6stat.ip6s_badoptions++;
971: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 972: return (-1);
1.35 itojun 973: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
974: ip6stat.ip6s_badoptions++;
975: ip6 = mtod(m, struct ip6_hdr *);
976: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
977: (m->m_flags & (M_BCAST|M_MCAST)))
978: m_freem(m);
979: else
980: icmp6_error(m, ICMP6_PARAM_PROB,
981: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 982: return (-1);
1.2 itojun 983: }
984:
985: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 986: return (-1);
1.2 itojun 987: }
988:
989: /*
1.9 itojun 990: * Create the "control" list for this pcb.
991: *
992: * The routine will be called from upper layer handlers like tcp6_input().
993: * Thus the routine assumes that the caller (tcp6_input) have already
994: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
995: * very first mbuf on the mbuf chain.
996: * We may want to add some infinite loop prevention or sanity checks for safety.
997: * (This applies only when you are using KAME mbuf chain restriction, i.e.
998: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 999: */
1000: void
1001: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 1002: struct in6pcb *in6p;
1003: struct mbuf **mp;
1004: struct ip6_hdr *ip6;
1005: struct mbuf *m;
1.2 itojun 1006: {
1007: struct proc *p = curproc; /* XXX */
1.9 itojun 1008: int privileged;
1.2 itojun 1009:
1.9 itojun 1010: privileged = 0;
1011: if (p && !suser(p->p_ucred, &p->p_acflag))
1012: privileged++;
1013:
1014: #ifdef SO_TIMESTAMP
1.2 itojun 1015: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1016: struct timeval tv;
1017:
1018: microtime(&tv);
1019: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63 itojun 1020: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1021: if (*mp)
1022: mp = &(*mp)->m_next;
1023: }
1.9 itojun 1024: #endif
1.2 itojun 1025: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1026: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1.63 itojun 1027: sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6);
1.2 itojun 1028: if (*mp)
1029: mp = &(*mp)->m_next;
1030: }
1031:
1032: #ifdef noyet
1033: /* options were tossed above */
1034: if (in6p->in6p_flags & IN6P_RECVOPTS)
1035: /* broken */
1036: /* ip6_srcroute doesn't do what we want here, need to fix */
1037: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1038: /* broken */
1039: #endif
1040:
1041: /* RFC 2292 sec. 5 */
1.35 itojun 1042: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1043: struct in6_pktinfo pi6;
1044: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1045: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1046: pi6.ipi6_addr.s6_addr16[1] = 0;
1047: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1048: ? m->m_pkthdr.rcvif->if_index
1049: : 0;
1050: *mp = sbcreatecontrol((caddr_t) &pi6,
1.63 itojun 1051: sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6);
1.2 itojun 1052: if (*mp)
1053: mp = &(*mp)->m_next;
1054: }
1055: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1056: int hlim = ip6->ip6_hlim & 0xff;
1.63 itojun 1057: *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1058: IPV6_HOPLIMIT, IPPROTO_IPV6);
1.2 itojun 1059: if (*mp)
1060: mp = &(*mp)->m_next;
1061: }
1062: /* IN6P_NEXTHOP - for outgoing packet only */
1063:
1064: /*
1065: * IPV6_HOPOPTS socket option. We require super-user privilege
1066: * for the option, but it might be too strict, since there might
1067: * be some hop-by-hop options which can be returned to normal user.
1068: * See RFC 2292 section 6.
1069: */
1.35 itojun 1070: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1071: /*
1072: * Check if a hop-by-hop options header is contatined in the
1073: * received packet, and if so, store the options as ancillary
1074: * data. Note that a hop-by-hop options header must be
1075: * just after the IPv6 header, which fact is assured through
1076: * the IPv6 input processing.
1077: */
1078: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1079: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1080: struct ip6_hbh *hbh;
1081: int hbhlen;
1.62 itojun 1082: struct mbuf *ext;
1.9 itojun 1083:
1.62 itojun 1084: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1085: ip6->ip6_nxt);
1086: if (ext == NULL) {
1.9 itojun 1087: ip6stat.ip6s_tooshort++;
1088: return;
1089: }
1.62 itojun 1090: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1091: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1092: if (hbhlen != ext->m_len) {
1093: m_freem(ext);
1.9 itojun 1094: ip6stat.ip6s_tooshort++;
1095: return;
1096: }
1.2 itojun 1097:
1098: /*
1099: * XXX: We copy whole the header even if a jumbo
1100: * payload option is included, which option is to
1101: * be removed before returning in the RFC 2292.
1102: * But it's too painful operation...
1103: */
1.9 itojun 1104: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.63 itojun 1105: IPV6_HOPOPTS, IPPROTO_IPV6);
1.2 itojun 1106: if (*mp)
1107: mp = &(*mp)->m_next;
1.62 itojun 1108: m_freem(ext);
1.2 itojun 1109: }
1110: }
1111:
1112: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1113: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1114: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60 simonb 1115: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1116:
1117: /*
1118: * Search for destination options headers or routing
1119: * header(s) through the header chain, and stores each
1120: * header as ancillary data.
1121: * Note that the order of the headers remains in
1122: * the chain of ancillary data.
1123: */
1.35 itojun 1124: while (1) { /* is explicit loop prevention necessary? */
1.62 itojun 1125: struct ip6_ext *ip6e = NULL;
1.9 itojun 1126: int elen;
1.62 itojun 1127: struct mbuf *ext = NULL;
1.9 itojun 1128:
1.62 itojun 1129: /*
1130: * if it is not an extension header, don't try to
1131: * pull it from the chain.
1132: */
1133: switch (nxt) {
1134: case IPPROTO_DSTOPTS:
1135: case IPPROTO_ROUTING:
1136: case IPPROTO_HOPOPTS:
1137: case IPPROTO_AH: /* is it possible? */
1138: break;
1139: default:
1140: goto loopend;
1141: }
1142:
1143: ext = ip6_pullexthdr(m, off, nxt);
1144: if (ext == NULL) {
1.9 itojun 1145: ip6stat.ip6s_tooshort++;
1146: return;
1147: }
1.62 itojun 1148: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1149: if (nxt == IPPROTO_AH)
1150: elen = (ip6e->ip6e_len + 2) << 2;
1151: else
1152: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1153: if (elen != ext->m_len) {
1154: m_freem(ext);
1.9 itojun 1155: ip6stat.ip6s_tooshort++;
1156: return;
1157: }
1.57 thorpej 1158: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1159:
1.35 itojun 1160: switch (nxt) {
1.62 itojun 1161: case IPPROTO_DSTOPTS:
1.35 itojun 1162: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1163: break;
1164:
1165: /*
1166: * We also require super-user privilege for
1167: * the option.
1168: * See the comments on IN6_HOPOPTS.
1169: */
1170: if (!privileged)
1171: break;
1172:
1173: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1174: IPV6_DSTOPTS, IPPROTO_IPV6);
1.35 itojun 1175: if (*mp)
1176: mp = &(*mp)->m_next;
1177: break;
1178:
1179: case IPPROTO_ROUTING:
1180: if (!in6p->in6p_flags & IN6P_RTHDR)
1181: break;
1182:
1183: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1184: IPV6_RTHDR, IPPROTO_IPV6);
1.35 itojun 1185: if (*mp)
1186: mp = &(*mp)->m_next;
1187: break;
1188:
1.62 itojun 1189: case IPPROTO_HOPOPTS:
1190: case IPPROTO_AH: /* is it possible? */
1191: break;
1192:
1.35 itojun 1193: default:
1194: /*
1.62 itojun 1195: * other cases have been filtered in the above.
1196: * none will visit this case. here we supply
1197: * the code just in case (nxt overwritten or
1198: * other cases).
1.35 itojun 1199: */
1.62 itojun 1200: m_freem(ext);
1.35 itojun 1201: goto loopend;
1202:
1.2 itojun 1203: }
1204:
1205: /* proceed with the next header. */
1.9 itojun 1206: off += elen;
1.2 itojun 1207: nxt = ip6e->ip6e_nxt;
1.62 itojun 1208: ip6e = NULL;
1209: m_freem(ext);
1210: ext = NULL;
1.2 itojun 1211: }
1212: loopend:
1.62 itojun 1213: ;
1.2 itojun 1214: }
1.62 itojun 1215: }
1216:
1217: /*
1218: * pull single extension header from mbuf chain. returns single mbuf that
1219: * contains the result, or NULL on error.
1220: */
1221: static struct mbuf *
1222: ip6_pullexthdr(m, off, nxt)
1223: struct mbuf *m;
1224: size_t off;
1225: int nxt;
1226: {
1227: struct ip6_ext ip6e;
1228: size_t elen;
1229: struct mbuf *n;
1230:
1231: #ifdef DIAGNOSTIC
1232: switch (nxt) {
1233: case IPPROTO_DSTOPTS:
1234: case IPPROTO_ROUTING:
1235: case IPPROTO_HOPOPTS:
1236: case IPPROTO_AH: /* is it possible? */
1237: break;
1238: default:
1239: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1240: }
1.62 itojun 1241: #endif
1.2 itojun 1242:
1.62 itojun 1243: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1244: if (nxt == IPPROTO_AH)
1245: elen = (ip6e.ip6e_len + 2) << 2;
1246: else
1247: elen = (ip6e.ip6e_len + 1) << 3;
1248:
1249: MGET(n, M_DONTWAIT, MT_DATA);
1250: if (n && elen >= MLEN) {
1251: MCLGET(n, M_DONTWAIT);
1252: if ((n->m_flags & M_EXT) == 0) {
1253: m_free(n);
1254: n = NULL;
1255: }
1256: }
1257: if (!n)
1258: return NULL;
1259:
1260: n->m_len = 0;
1261: if (elen >= M_TRAILINGSPACE(n)) {
1262: m_free(n);
1263: return NULL;
1264: }
1265:
1266: m_copydata(m, off, elen, mtod(n, caddr_t));
1267: n->m_len = elen;
1268: return n;
1.2 itojun 1269: }
1270:
1271: /*
1272: * Get pointer to the previous header followed by the header
1273: * currently processed.
1274: * XXX: This function supposes that
1275: * M includes all headers,
1276: * the next header field and the header length field of each header
1277: * are valid, and
1278: * the sum of each header length equals to OFF.
1279: * Because of these assumptions, this function must be called very
1280: * carefully. Moreover, it will not be used in the near future when
1281: * we develop `neater' mechanism to process extension headers.
1282: */
1.58 itojun 1283: u_int8_t *
1.2 itojun 1284: ip6_get_prevhdr(m, off)
1285: struct mbuf *m;
1286: int off;
1287: {
1288: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1289:
1290: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1291: return (&ip6->ip6_nxt);
1.2 itojun 1292: else {
1293: int len, nxt;
1294: struct ip6_ext *ip6e = NULL;
1295:
1296: nxt = ip6->ip6_nxt;
1297: len = sizeof(struct ip6_hdr);
1298: while (len < off) {
1299: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1300:
1.35 itojun 1301: switch (nxt) {
1.2 itojun 1302: case IPPROTO_FRAGMENT:
1303: len += sizeof(struct ip6_frag);
1304: break;
1305: case IPPROTO_AH:
1306: len += (ip6e->ip6e_len + 2) << 2;
1307: break;
1308: default:
1309: len += (ip6e->ip6e_len + 1) << 3;
1310: break;
1311: }
1312: nxt = ip6e->ip6e_nxt;
1313: }
1314: if (ip6e)
1.58 itojun 1315: return (&ip6e->ip6e_nxt);
1.2 itojun 1316: else
1317: return NULL;
1.18 itojun 1318: }
1319: }
1320:
1321: /*
1322: * get next header offset. m will be retained.
1323: */
1324: int
1325: ip6_nexthdr(m, off, proto, nxtp)
1326: struct mbuf *m;
1327: int off;
1328: int proto;
1329: int *nxtp;
1330: {
1331: struct ip6_hdr ip6;
1332: struct ip6_ext ip6e;
1333: struct ip6_frag fh;
1334:
1335: /* just in case */
1336: if (m == NULL)
1337: panic("ip6_nexthdr: m == NULL");
1338: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1339: return -1;
1340:
1341: switch (proto) {
1342: case IPPROTO_IPV6:
1343: if (m->m_pkthdr.len < off + sizeof(ip6))
1344: return -1;
1345: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1346: if (nxtp)
1347: *nxtp = ip6.ip6_nxt;
1348: off += sizeof(ip6);
1349: return off;
1350:
1351: case IPPROTO_FRAGMENT:
1352: /*
1353: * terminate parsing if it is not the first fragment,
1354: * it does not make sense to parse through it.
1355: */
1356: if (m->m_pkthdr.len < off + sizeof(fh))
1357: return -1;
1358: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1359: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1360: return -1;
1361: if (nxtp)
1362: *nxtp = fh.ip6f_nxt;
1363: off += sizeof(struct ip6_frag);
1364: return off;
1365:
1366: case IPPROTO_AH:
1367: if (m->m_pkthdr.len < off + sizeof(ip6e))
1368: return -1;
1369: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1370: if (nxtp)
1371: *nxtp = ip6e.ip6e_nxt;
1372: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1373: if (m->m_pkthdr.len < off)
1374: return -1;
1.18 itojun 1375: return off;
1376:
1377: case IPPROTO_HOPOPTS:
1378: case IPPROTO_ROUTING:
1379: case IPPROTO_DSTOPTS:
1380: if (m->m_pkthdr.len < off + sizeof(ip6e))
1381: return -1;
1382: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1383: if (nxtp)
1384: *nxtp = ip6e.ip6e_nxt;
1385: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1386: if (m->m_pkthdr.len < off)
1387: return -1;
1.18 itojun 1388: return off;
1389:
1390: case IPPROTO_NONE:
1391: case IPPROTO_ESP:
1392: case IPPROTO_IPCOMP:
1393: /* give up */
1394: return -1;
1395:
1396: default:
1397: return -1;
1398: }
1399: }
1400:
1401: /*
1402: * get offset for the last header in the chain. m will be kept untainted.
1403: */
1404: int
1405: ip6_lasthdr(m, off, proto, nxtp)
1406: struct mbuf *m;
1407: int off;
1408: int proto;
1409: int *nxtp;
1410: {
1411: int newoff;
1412: int nxt;
1413:
1414: if (!nxtp) {
1415: nxt = -1;
1416: nxtp = &nxt;
1417: }
1418: while (1) {
1419: newoff = ip6_nexthdr(m, off, proto, nxtp);
1420: if (newoff < 0)
1421: return off;
1422: else if (newoff < off)
1423: return -1; /* invalid */
1424: else if (newoff == off)
1425: return newoff;
1426:
1427: off = newoff;
1428: proto = *nxtp;
1.2 itojun 1429: }
1430: }
1431:
1432: /*
1433: * System control for IP6
1434: */
1435:
1436: u_char inet6ctlerrmap[PRC_NCMDS] = {
1437: 0, 0, 0, 0,
1438: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1439: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1440: EMSGSIZE, EHOSTUNREACH, 0, 0,
1441: 0, 0, 0, 0,
1442: ENOPROTOOPT
1443: };
1444:
1445: int
1446: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1447: int *name;
1448: u_int namelen;
1449: void *oldp;
1450: size_t *oldlenp;
1451: void *newp;
1452: size_t newlen;
1453: {
1.26 itojun 1454: int old, error;
1455:
1.2 itojun 1456: /* All sysctl names at this level are terminal. */
1457: if (namelen != 1)
1458: return ENOTDIR;
1459:
1460: switch (name[0]) {
1461:
1462: case IPV6CTL_FORWARDING:
1463: return sysctl_int(oldp, oldlenp, newp, newlen,
1464: &ip6_forwarding);
1465: case IPV6CTL_SENDREDIRECTS:
1466: return sysctl_int(oldp, oldlenp, newp, newlen,
1467: &ip6_sendredirects);
1468: case IPV6CTL_DEFHLIM:
1469: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1470: case IPV6CTL_MAXFRAGPACKETS:
1471: return sysctl_int(oldp, oldlenp, newp, newlen,
1472: &ip6_maxfragpackets);
1473: case IPV6CTL_ACCEPT_RTADV:
1474: return sysctl_int(oldp, oldlenp, newp, newlen,
1475: &ip6_accept_rtadv);
1476: case IPV6CTL_KEEPFAITH:
1477: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1478: case IPV6CTL_LOG_INTERVAL:
1479: return sysctl_int(oldp, oldlenp, newp, newlen,
1480: &ip6_log_interval);
1481: case IPV6CTL_HDRNESTLIMIT:
1482: return sysctl_int(oldp, oldlenp, newp, newlen,
1483: &ip6_hdrnestlimit);
1484: case IPV6CTL_DAD_COUNT:
1485: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1486: case IPV6CTL_AUTO_FLOWLABEL:
1487: return sysctl_int(oldp, oldlenp, newp, newlen,
1488: &ip6_auto_flowlabel);
1489: case IPV6CTL_DEFMCASTHLIM:
1490: return sysctl_int(oldp, oldlenp, newp, newlen,
1491: &ip6_defmcasthlim);
1.51 itojun 1492: #if NGIF > 0
1.2 itojun 1493: case IPV6CTL_GIF_HLIM:
1494: return sysctl_int(oldp, oldlenp, newp, newlen,
1495: &ip6_gif_hlim);
1.51 itojun 1496: #endif
1.2 itojun 1497: case IPV6CTL_KAME_VERSION:
1498: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1499: case IPV6CTL_USE_DEPRECATED:
1500: return sysctl_int(oldp, oldlenp, newp, newlen,
1501: &ip6_use_deprecated);
1.10 itojun 1502: case IPV6CTL_RR_PRUNE:
1503: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1504: case IPV6CTL_V6ONLY:
1505: #ifdef INET6_BINDV6ONLY
1506: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1507: #else
1508: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1509: #endif
1510: case IPV6CTL_ANONPORTMIN:
1511: old = ip6_anonportmin;
1512: error = sysctl_int(oldp, oldlenp, newp, newlen,
1513: &ip6_anonportmin);
1514: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1515: ip6_anonportmin > 65535
1516: #ifndef IPNOPRIVPORTS
1517: || ip6_anonportmin < IPV6PORT_RESERVED
1518: #endif
1519: ) {
1520: ip6_anonportmin = old;
1521: return (EINVAL);
1522: }
1523: return (error);
1524: case IPV6CTL_ANONPORTMAX:
1525: old = ip6_anonportmax;
1526: error = sysctl_int(oldp, oldlenp, newp, newlen,
1527: &ip6_anonportmax);
1528: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1529: ip6_anonportmax > 65535
1530: #ifndef IPNOPRIVPORTS
1531: || ip6_anonportmax < IPV6PORT_RESERVED
1532: #endif
1533: ) {
1534: ip6_anonportmax = old;
1535: return (EINVAL);
1536: }
1537: return (error);
1538: #ifndef IPNOPRIVPORTS
1539: case IPV6CTL_LOWPORTMIN:
1540: old = ip6_lowportmin;
1541: error = sysctl_int(oldp, oldlenp, newp, newlen,
1542: &ip6_lowportmin);
1543: if (ip6_lowportmin >= ip6_lowportmax ||
1544: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1545: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1546: ip6_lowportmin = old;
1547: return (EINVAL);
1548: }
1549: return (error);
1550: case IPV6CTL_LOWPORTMAX:
1551: old = ip6_lowportmax;
1552: error = sysctl_int(oldp, oldlenp, newp, newlen,
1553: &ip6_lowportmax);
1554: if (ip6_lowportmin >= ip6_lowportmax ||
1555: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1556: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1557: ip6_lowportmax = old;
1558: return (EINVAL);
1559: }
1560: return (error);
1.11 itojun 1561: #endif
1.53 itojun 1562: case IPV6CTL_MAXFRAGS:
1563: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2 itojun 1564: default:
1565: return EOPNOTSUPP;
1566: }
1567: /* NOTREACHED */
1568: }
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