Annotation of src/sys/netinet6/ip6_input.c, Revision 1.67
1.67 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.66 2003/09/06 03:36:33 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.
1.65 agc 45: * 3. Neither the name of the University nor the names of its contributors
1.2 itojun 46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
62: */
1.48 lukem 63:
64: #include <sys/cdefs.h>
1.67 ! itojun 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.66 2003/09/06 03:36:33 itojun Exp $");
1.2 itojun 66:
67: #include "opt_inet.h"
1.4 thorpej 68: #include "opt_ipsec.h"
1.15 darrenr 69: #include "opt_pfil_hooks.h"
1.2 itojun 70:
71: #include <sys/param.h>
72: #include <sys/systm.h>
73: #include <sys/malloc.h>
74: #include <sys/mbuf.h>
75: #include <sys/domain.h>
76: #include <sys/protosw.h>
77: #include <sys/socket.h>
78: #include <sys/socketvar.h>
79: #include <sys/errno.h>
80: #include <sys/time.h>
81: #include <sys/kernel.h>
82: #include <sys/syslog.h>
83: #include <sys/proc.h>
1.46 simonb 84: #include <sys/sysctl.h>
1.2 itojun 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>
1.45 itojun 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>
108:
1.37 itojun 109: #ifdef IPSEC
110: #include <netinet6/ipsec.h>
111: #endif
112:
1.2 itojun 113: #include <netinet6/ip6protosw.h>
114:
115: /* we need it for NLOOP. */
116: #include "loop.h"
117: #include "faith.h"
118: #include "gif.h"
119: #include "bpfilter.h"
1.50 itojun 120:
121: #if NGIF > 0
122: #include <netinet6/in6_gif.h>
123: #endif
1.2 itojun 124:
1.9 itojun 125: #include <net/net_osdep.h>
126:
1.2 itojun 127: extern struct domain inet6domain;
128:
129: u_char ip6_protox[IPPROTO_MAX];
130: static int ip6qmaxlen = IFQ_MAXLEN;
131: struct in6_ifaddr *in6_ifaddr;
132: struct ifqueue ip6intrq;
133:
134: extern struct ifnet loif[NLOOP];
135: int ip6_forward_srcrt; /* XXX */
136: int ip6_sourcecheck; /* XXX */
137: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 138:
1.29 thorpej 139: #ifdef PFIL_HOOKS
140: struct pfil_head inet6_pfil_hook;
141: #endif
142:
1.2 itojun 143: struct ip6stat ip6stat;
144:
145: static void ip6_init2 __P((void *));
146:
1.5 itojun 147: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62 itojun 148: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2 itojun 149:
150: /*
151: * IP6 initialization: fill in IP6 protocol switch table.
152: * All protocols not implemented in kernel go to raw IP6 protocol handler.
153: */
154: void
155: ip6_init()
156: {
1.35 itojun 157: struct ip6protosw *pr;
158: int i;
1.2 itojun 159:
160: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
161: if (pr == 0)
162: panic("ip6_init");
163: for (i = 0; i < IPPROTO_MAX; i++)
164: ip6_protox[i] = pr - inet6sw;
165: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
166: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
167: if (pr->pr_domain->dom_family == PF_INET6 &&
168: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
169: ip6_protox[pr->pr_protocol] = pr - inet6sw;
170: ip6intrq.ifq_maxlen = ip6qmaxlen;
171: nd6_init();
172: frag6_init();
173:
174: ip6_init2((void *)0);
1.29 thorpej 175:
176: #ifdef PFIL_HOOKS
177: /* Register our Packet Filter hook. */
1.33 thorpej 178: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
179: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 180: i = pfil_head_register(&inet6_pfil_hook);
181: if (i != 0)
182: printf("ip6_init: WARNING: unable to register pfil hook, "
183: "error %d\n", i);
184: #endif /* PFIL_HOOKS */
1.2 itojun 185: }
186:
187: static void
188: ip6_init2(dummy)
189: void *dummy;
190: {
191:
192: /* nd6_timer_init */
1.19 thorpej 193: callout_init(&nd6_timer_ch);
194: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2 itojun 195: }
196:
197: /*
198: * IP6 input interrupt handling. Just pass the packet to ip6_input.
199: */
200: void
201: ip6intr()
202: {
203: int s;
204: struct mbuf *m;
205:
206: for (;;) {
1.41 thorpej 207: s = splnet();
1.2 itojun 208: IF_DEQUEUE(&ip6intrq, m);
209: splx(s);
210: if (m == 0)
211: return;
212: ip6_input(m);
213: }
214: }
215:
216: extern struct route_in6 ip6_forward_rt;
217:
218: void
219: ip6_input(m)
220: struct mbuf *m;
221: {
1.9 itojun 222: struct ip6_hdr *ip6;
1.2 itojun 223: int off = sizeof(struct ip6_hdr), nest;
224: u_int32_t plen;
1.5 itojun 225: u_int32_t rtalert = ~0;
1.2 itojun 226: int nxt, ours = 0;
1.9 itojun 227: struct ifnet *deliverifp = NULL;
1.64 itojun 228: int srcrt = 0;
1.2 itojun 229:
230: #ifdef IPSEC
231: /*
232: * should the inner packet be considered authentic?
233: * see comment in ah4_input().
234: */
1.49 itojun 235: m->m_flags &= ~M_AUTHIPHDR;
236: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 237: #endif
1.9 itojun 238:
1.2 itojun 239: /*
1.44 itojun 240: * mbuf statistics
1.2 itojun 241: */
242: if (m->m_flags & M_EXT) {
243: if (m->m_next)
244: ip6stat.ip6s_mext2m++;
245: else
246: ip6stat.ip6s_mext1++;
247: } else {
1.40 itojun 248: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 249: if (m->m_next) {
1.9 itojun 250: if (m->m_flags & M_LOOP) {
1.44 itojun 251: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 252: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 253: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
254: else
255: ip6stat.ip6s_m2m[0]++;
256: } else
257: ip6stat.ip6s_m1++;
1.40 itojun 258: #undef M2MMAX
1.2 itojun 259: }
260:
1.9 itojun 261: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
262: ip6stat.ip6s_total++;
263:
1.57 thorpej 264: /*
265: * If the IPv6 header is not aligned, slurp it up into a new
266: * mbuf with space for link headers, in the event we forward
267: * it. OTherwise, if it is aligned, make sure the entire base
268: * IPv6 header is in the first mbuf of the chain.
269: */
270: if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
271: struct ifnet *inifp = m->m_pkthdr.rcvif;
272: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
273: (max_linkhdr + 3) & ~3)) == NULL) {
274: /* XXXJRT new stat, please */
275: ip6stat.ip6s_toosmall++;
276: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
277: return;
278: }
279: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
280: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 281: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9 itojun 282: ip6stat.ip6s_toosmall++;
283: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
284: return;
285: }
1.2 itojun 286: }
287:
288: ip6 = mtod(m, struct ip6_hdr *);
289:
290: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
291: ip6stat.ip6s_badvers++;
1.9 itojun 292: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 293: goto bad;
294: }
1.15 darrenr 295:
296: #ifdef PFIL_HOOKS
297: /*
298: * Run through list of hooks for input packets. If there are any
299: * filters which require that additional packets in the flow are
300: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
301: * Note that filters must _never_ set this flag, as another filter
302: * in the list may have previously cleared it.
303: */
1.39 itojun 304: /*
305: * let ipfilter look at packet on the wire,
306: * not the decapsulated packet.
307: */
308: #ifdef IPSEC
1.42 itojun 309: if (!ipsec_getnhist(m))
1.39 itojun 310: #else
311: if (1)
312: #endif
313: {
1.64 itojun 314: struct in6_addr odst;
315:
316: odst = ip6->ip6_dst;
1.39 itojun 317: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
318: PFIL_IN) != 0)
319: return;
320: if (m == NULL)
321: return;
322: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 323: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 324: }
1.15 darrenr 325: #endif /* PFIL_HOOKS */
326:
1.2 itojun 327: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
328:
1.30 thorpej 329: #ifdef ALTQ
330: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
331: /* packet is dropped by traffic conditioner */
332: return;
1.9 itojun 333: }
334: #endif
335:
1.2 itojun 336: /*
1.44 itojun 337: * Check against address spoofing/corruption.
1.2 itojun 338: */
339: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
340: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 341: /*
342: * XXX: "badscope" is not very suitable for a multicast source.
343: */
1.2 itojun 344: ip6stat.ip6s_badscope++;
1.9 itojun 345: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 346: goto bad;
347: }
1.13 itojun 348: /*
1.44 itojun 349: * The following check is not documented in specs. A malicious
350: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
351: * and bypass security checks (act as if it was from 127.0.0.1 by using
352: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 353: *
1.44 itojun 354: * This check chokes if we are in an SIIT cloud. As none of BSDs
355: * support IPv4-less kernel compilation, we cannot support SIIT
356: * environment at all. So, it makes more sense for us to reject any
357: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 358: * partial support for SIIT environment.
1.13 itojun 359: */
360: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
361: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
362: ip6stat.ip6s_badscope++;
363: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
364: goto bad;
365: }
1.17 itojun 366: #if 0
1.13 itojun 367: /*
1.17 itojun 368: * Reject packets with IPv4 compatible addresses (auto tunnel).
369: *
370: * The code forbids auto tunnel relay case in RFC1933 (the check is
371: * stronger than RFC1933). We may want to re-enable it if mech-xx
372: * is revised to forbid relaying case.
1.13 itojun 373: */
374: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
375: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
376: ip6stat.ip6s_badscope++;
377: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
378: goto bad;
379: }
380: #endif
1.35 itojun 381:
1.2 itojun 382: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
383: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
384: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
385: ours = 1;
1.9 itojun 386: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 387: goto hbhcheck;
388: } else {
389: ip6stat.ip6s_badscope++;
1.9 itojun 390: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 391: goto bad;
392: }
393: }
394:
1.38 itojun 395: /* drop packets if interface ID portion is already filled */
396: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
397: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
398: ip6->ip6_src.s6_addr16[1]) {
399: ip6stat.ip6s_badscope++;
400: goto bad;
401: }
402: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
403: ip6->ip6_dst.s6_addr16[1]) {
404: ip6stat.ip6s_badscope++;
405: goto bad;
406: }
407: }
1.2 itojun 408:
1.40 itojun 409: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
410: ip6->ip6_src.s6_addr16[1]
411: = htons(m->m_pkthdr.rcvif->if_index);
412: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
413: ip6->ip6_dst.s6_addr16[1]
414: = htons(m->m_pkthdr.rcvif->if_index);
415:
416: /*
417: * We use rt->rt_ifp to determine if the address is ours or not.
418: * If rt_ifp is lo0, the address is ours.
419: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
420: * so any address under fe80::%lo0/64 will be mistakenly considered
421: * local. The special case is supplied to handle the case properly
422: * by actually looking at interface addresses
423: * (using in6ifa_ifpwithaddr).
424: */
425: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
426: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
427: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
428: icmp6_error(m, ICMP6_DST_UNREACH,
429: ICMP6_DST_UNREACH_ADDR, 0);
430: /* m is already freed */
431: return;
1.21 itojun 432: }
1.40 itojun 433:
434: ours = 1;
435: deliverifp = m->m_pkthdr.rcvif;
436: goto hbhcheck;
1.9 itojun 437: }
438:
1.2 itojun 439: /*
440: * Multicast check
441: */
442: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
443: struct in6_multi *in6m = 0;
1.9 itojun 444:
445: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 446: /*
447: * See if we belong to the destination multicast group on the
448: * arrival interface.
449: */
450: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
451: if (in6m)
452: ours = 1;
453: else if (!ip6_mrouter) {
454: ip6stat.ip6s_notmember++;
455: ip6stat.ip6s_cantforward++;
1.9 itojun 456: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 457: goto bad;
458: }
1.9 itojun 459: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 460: goto hbhcheck;
461: }
462:
463: /*
464: * Unicast check
465: */
1.22 itojun 466: if (ip6_forward_rt.ro_rt != NULL &&
1.55 itojun 467: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22 itojun 468: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 469: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 470: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 471: else {
1.35 itojun 472: struct sockaddr_in6 *dst6;
473:
1.2 itojun 474: if (ip6_forward_rt.ro_rt) {
1.22 itojun 475: /* route is down or destination is different */
1.25 itojun 476: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 477: RTFREE(ip6_forward_rt.ro_rt);
478: ip6_forward_rt.ro_rt = 0;
479: }
1.22 itojun 480:
1.2 itojun 481: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 482: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
483: dst6->sin6_len = sizeof(struct sockaddr_in6);
484: dst6->sin6_family = AF_INET6;
485: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 486:
1.9 itojun 487: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 488: }
489:
490: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
491:
492: /*
493: * Accept the packet if the forwarding interface to the destination
494: * according to the routing table is the loopback interface,
495: * unless the associated route has a gateway.
496: * Note that this approach causes to accept a packet if there is a
497: * route to the loopback interface for the destination of the packet.
498: * But we think it's even useful in some situations, e.g. when using
499: * a special daemon which wants to intercept the packet.
500: */
501: if (ip6_forward_rt.ro_rt &&
502: (ip6_forward_rt.ro_rt->rt_flags &
503: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55 itojun 504: !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2 itojun 505: #if 0
506: /*
507: * The check below is redundant since the comparison of
508: * the destination and the key of the rtentry has
509: * already done through looking up the routing table.
510: */
511: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55 itojun 512: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2 itojun 513: #endif
1.9 itojun 514: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 515: struct in6_ifaddr *ia6 =
516: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
517: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
518: m->m_flags |= M_ANYCAST6;
1.24 itojun 519: /*
520: * packets to a tentative, duplicated, or somehow invalid
521: * address must not be accepted.
522: */
1.2 itojun 523: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 524: /* this address is ready */
1.2 itojun 525: ours = 1;
1.9 itojun 526: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 527: goto hbhcheck;
528: } else {
1.24 itojun 529: /* address is not ready, so discard the packet. */
1.34 itojun 530: nd6log((LOG_INFO,
1.27 itojun 531: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 532: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 533: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 534:
535: goto bad;
1.2 itojun 536: }
537: }
538:
539: /*
1.55 itojun 540: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 541: */
542: #if defined(NFAITH) && 0 < NFAITH
543: if (ip6_keepfaith) {
544: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
545: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
546: /* XXX do we need more sanity checks? */
547: ours = 1;
1.45 itojun 548: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 549: goto hbhcheck;
550: }
551: }
552: #endif
553:
554: #if 0
555: {
556: /*
557: * Last resort: check in6_ifaddr for incoming interface.
558: * The code is here until I update the "goto ours hack" code above
559: * working right.
560: */
561: struct ifaddr *ifa;
562: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
563: ifa;
564: ifa = ifa->ifa_list.tqe_next) {
565: if (ifa->ifa_addr == NULL)
566: continue; /* just for safety */
567: if (ifa->ifa_addr->sa_family != AF_INET6)
568: continue;
569: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
570: ours = 1;
571: deliverifp = ifa->ifa_ifp;
1.2 itojun 572: goto hbhcheck;
573: }
574: }
1.9 itojun 575: }
1.2 itojun 576: #endif
577:
578: /*
579: * Now there is no reason to process the packet if it's not our own
580: * and we're not a router.
581: */
582: if (!ip6_forwarding) {
583: ip6stat.ip6s_cantforward++;
1.9 itojun 584: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 585: goto bad;
586: }
587:
588: hbhcheck:
589: /*
590: * Process Hop-by-Hop options header if it's contained.
591: * m may be modified in ip6_hopopts_input().
592: * If a JumboPayload option is included, plen will also be modified.
593: */
594: plen = (u_int32_t)ntohs(ip6->ip6_plen);
595: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 596: struct ip6_hbh *hbh;
597:
598: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
599: #if 0 /*touches NULL pointer*/
600: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
601: #endif
1.2 itojun 602: return; /* m have already been freed */
1.9 itojun 603: }
1.22 itojun 604:
1.2 itojun 605: /* adjust pointer */
606: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 607:
608: /*
1.49 itojun 609: * if the payload length field is 0 and the next header field
1.22 itojun 610: * indicates Hop-by-Hop Options header, then a Jumbo Payload
611: * option MUST be included.
612: */
613: if (ip6->ip6_plen == 0 && plen == 0) {
614: /*
615: * Note that if a valid jumbo payload option is
616: * contained, ip6_hoptops_input() must set a valid
1.55 itojun 617: * (non-zero) payload length to the variable plen.
1.22 itojun 618: */
619: ip6stat.ip6s_badoptions++;
620: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
621: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
622: icmp6_error(m, ICMP6_PARAM_PROB,
623: ICMP6_PARAMPROB_HEADER,
624: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
625: return;
626: }
1.9 itojun 627: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
628: sizeof(struct ip6_hbh));
629: if (hbh == NULL) {
630: ip6stat.ip6s_tooshort++;
631: return;
632: }
1.57 thorpej 633: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 634: nxt = hbh->ip6h_nxt;
1.2 itojun 635:
636: /*
637: * accept the packet if a router alert option is included
638: * and we act as an IPv6 router.
639: */
1.5 itojun 640: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 641: ours = 1;
642: } else
643: nxt = ip6->ip6_nxt;
644:
645: /*
646: * Check that the amount of data in the buffers
647: * is as at least much as the IPv6 header would have us expect.
648: * Trim mbufs if longer than we expect.
649: * Drop packet if shorter than we expect.
650: */
651: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
652: ip6stat.ip6s_tooshort++;
1.9 itojun 653: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 654: goto bad;
655: }
656: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
657: if (m->m_len == m->m_pkthdr.len) {
658: m->m_len = sizeof(struct ip6_hdr) + plen;
659: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
660: } else
661: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
662: }
663:
664: /*
665: * Forward if desirable.
666: */
667: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
668: /*
669: * If we are acting as a multicast router, all
670: * incoming multicast packets are passed to the
671: * kernel-level multicast forwarding function.
672: * The packet is returned (relatively) intact; if
673: * ip6_mforward() returns a non-zero value, the packet
674: * must be discarded, else it may be accepted below.
675: */
676: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
677: ip6stat.ip6s_cantforward++;
678: m_freem(m);
679: return;
680: }
681: if (!ours) {
682: m_freem(m);
683: return;
684: }
1.22 itojun 685: } else if (!ours) {
1.64 itojun 686: ip6_forward(m, srcrt);
1.2 itojun 687: return;
1.56 itojun 688: }
1.25 itojun 689:
690: ip6 = mtod(m, struct ip6_hdr *);
691:
692: /*
693: * Malicious party may be able to use IPv4 mapped addr to confuse
694: * tcp/udp stack and bypass security checks (act as if it was from
695: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
696: *
697: * For SIIT end node behavior, you may want to disable the check.
698: * However, you will become vulnerable to attacks using IPv4 mapped
699: * source.
700: */
701: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
702: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
703: ip6stat.ip6s_badscope++;
704: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
705: goto bad;
706: }
1.2 itojun 707:
708: /*
709: * Tell launch routine the next header
710: */
1.12 itojun 711: #ifdef IFA_STATS
1.28 itojun 712: if (deliverifp != NULL) {
1.9 itojun 713: struct in6_ifaddr *ia6;
714: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
715: if (ia6)
716: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
717: }
718: #endif
1.2 itojun 719: ip6stat.ip6s_delivered++;
1.9 itojun 720: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 721: nest = 0;
1.40 itojun 722:
1.2 itojun 723: while (nxt != IPPROTO_DONE) {
724: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
725: ip6stat.ip6s_toomanyhdr++;
726: goto bad;
727: }
1.8 itojun 728:
729: /*
730: * protection against faulty packet - there should be
731: * more sanity checks in header chain processing.
732: */
733: if (m->m_pkthdr.len < off) {
734: ip6stat.ip6s_tooshort++;
1.9 itojun 735: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 736: goto bad;
737: }
738:
1.37 itojun 739: #ifdef IPSEC
740: /*
741: * enforce IPsec policy checking if we are seeing last header.
742: * note that we do not visit this with protocols with pcb layer
743: * code - like udp/tcp/raw ip.
744: */
745: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
746: ipsec6_in_reject(m, NULL)) {
747: ipsec6stat.in_polvio++;
748: goto bad;
749: }
750: #endif
1.56 itojun 751:
1.2 itojun 752: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
753: }
754: return;
755: bad:
756: m_freem(m);
757: }
758:
759: /*
760: * Hop-by-Hop options header processing. If a valid jumbo payload option is
761: * included, the real payload length will be stored in plenp.
762: */
763: static int
764: ip6_hopopts_input(plenp, rtalertp, mp, offp)
765: u_int32_t *plenp;
1.5 itojun 766: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 767: struct mbuf **mp;
768: int *offp;
769: {
1.35 itojun 770: struct mbuf *m = *mp;
1.2 itojun 771: int off = *offp, hbhlen;
772: struct ip6_hbh *hbh;
773: u_int8_t *opt;
774:
775: /* validation of the length of the header */
1.9 itojun 776: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
777: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
778: if (hbh == NULL) {
779: ip6stat.ip6s_tooshort++;
780: return -1;
781: }
782: hbhlen = (hbh->ip6h_len + 1) << 3;
783: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
784: hbhlen);
785: if (hbh == NULL) {
786: ip6stat.ip6s_tooshort++;
787: return -1;
788: }
1.57 thorpej 789: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 790: off += hbhlen;
791: hbhlen -= sizeof(struct ip6_hbh);
792: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
793:
794: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
795: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 796: return (-1);
1.2 itojun 797:
798: *offp = off;
799: *mp = m;
1.58 itojun 800: return (0);
1.2 itojun 801: }
802:
803: /*
804: * Search header for all Hop-by-hop options and process each option.
805: * This function is separate from ip6_hopopts_input() in order to
806: * handle a case where the sending node itself process its hop-by-hop
807: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 808: *
809: * The function assumes that hbh header is located right after the IPv6 header
810: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
811: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 812: */
813: int
814: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
815: struct mbuf *m;
816: u_int8_t *opthead;
817: int hbhlen;
1.5 itojun 818: u_int32_t *rtalertp;
1.2 itojun 819: u_int32_t *plenp;
820: {
821: struct ip6_hdr *ip6;
822: int optlen = 0;
823: u_int8_t *opt = opthead;
824: u_int16_t rtalert_val;
1.22 itojun 825: u_int32_t jumboplen;
1.55 itojun 826: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 827:
828: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 829: switch (*opt) {
830: case IP6OPT_PAD1:
831: optlen = 1;
832: break;
833: case IP6OPT_PADN:
834: if (hbhlen < IP6OPT_MINLEN) {
835: ip6stat.ip6s_toosmall++;
836: goto bad;
837: }
838: optlen = *(opt + 1) + 2;
839: break;
840: case IP6OPT_RTALERT:
841: /* XXX may need check for alignment */
842: if (hbhlen < IP6OPT_RTALERT_LEN) {
843: ip6stat.ip6s_toosmall++;
844: goto bad;
845: }
846: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 847: /* XXX stat */
848: icmp6_error(m, ICMP6_PARAM_PROB,
849: ICMP6_PARAMPROB_HEADER,
850: erroff + opt + 1 - opthead);
851: return (-1);
1.35 itojun 852: }
853: optlen = IP6OPT_RTALERT_LEN;
854: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
855: *rtalertp = ntohs(rtalert_val);
856: break;
857: case IP6OPT_JUMBO:
1.22 itojun 858: /* XXX may need check for alignment */
859: if (hbhlen < IP6OPT_JUMBO_LEN) {
860: ip6stat.ip6s_toosmall++;
861: goto bad;
862: }
1.35 itojun 863: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 864: /* XXX stat */
865: icmp6_error(m, ICMP6_PARAM_PROB,
866: ICMP6_PARAMPROB_HEADER,
867: erroff + opt + 1 - opthead);
868: return (-1);
1.35 itojun 869: }
1.22 itojun 870: optlen = IP6OPT_JUMBO_LEN;
871:
872: /*
873: * IPv6 packets that have non 0 payload length
1.35 itojun 874: * must not contain a jumbo payload option.
1.22 itojun 875: */
876: ip6 = mtod(m, struct ip6_hdr *);
877: if (ip6->ip6_plen) {
878: ip6stat.ip6s_badoptions++;
879: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 880: ICMP6_PARAMPROB_HEADER,
881: erroff + opt - opthead);
882: return (-1);
1.22 itojun 883: }
1.2 itojun 884:
1.22 itojun 885: /*
886: * We may see jumbolen in unaligned location, so
887: * we'd need to perform bcopy().
888: */
889: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
890: jumboplen = (u_int32_t)htonl(jumboplen);
891:
892: #if 1
893: /*
894: * if there are multiple jumbo payload options,
895: * *plenp will be non-zero and the packet will be
896: * rejected.
897: * the behavior may need some debate in ipngwg -
898: * multiple options does not make sense, however,
899: * there's no explicit mention in specification.
900: */
901: if (*plenp != 0) {
902: ip6stat.ip6s_badoptions++;
903: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 904: ICMP6_PARAMPROB_HEADER,
905: erroff + opt + 2 - opthead);
906: return (-1);
1.22 itojun 907: }
1.8 itojun 908: #endif
1.2 itojun 909:
1.22 itojun 910: /*
911: * jumbo payload length must be larger than 65535.
912: */
913: if (jumboplen <= IPV6_MAXPACKET) {
914: ip6stat.ip6s_badoptions++;
915: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 916: ICMP6_PARAMPROB_HEADER,
917: erroff + opt + 2 - opthead);
918: return (-1);
1.22 itojun 919: }
920: *plenp = jumboplen;
921:
922: break;
1.35 itojun 923: default: /* unknown option */
924: if (hbhlen < IP6OPT_MINLEN) {
925: ip6stat.ip6s_toosmall++;
926: goto bad;
927: }
1.55 itojun 928: optlen = ip6_unknown_opt(opt, m,
929: erroff + opt - opthead);
930: if (optlen == -1)
931: return (-1);
1.35 itojun 932: optlen += 2;
933: break;
1.2 itojun 934: }
935: }
936:
1.55 itojun 937: return (0);
1.2 itojun 938:
939: bad:
940: m_freem(m);
1.55 itojun 941: return (-1);
1.2 itojun 942: }
943:
944: /*
945: * Unknown option processing.
946: * The third argument `off' is the offset from the IPv6 header to the option,
947: * which is necessary if the IPv6 header the and option header and IPv6 header
948: * is not continuous in order to return an ICMPv6 error.
949: */
950: int
951: ip6_unknown_opt(optp, m, off)
952: u_int8_t *optp;
953: struct mbuf *m;
954: int off;
955: {
956: struct ip6_hdr *ip6;
957:
1.35 itojun 958: switch (IP6OPT_TYPE(*optp)) {
959: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 960: return ((int)*(optp + 1));
1.35 itojun 961: case IP6OPT_TYPE_DISCARD: /* silently discard */
962: m_freem(m);
1.58 itojun 963: return (-1);
1.35 itojun 964: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
965: ip6stat.ip6s_badoptions++;
966: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 967: return (-1);
1.35 itojun 968: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
969: ip6stat.ip6s_badoptions++;
970: ip6 = mtod(m, struct ip6_hdr *);
971: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
972: (m->m_flags & (M_BCAST|M_MCAST)))
973: m_freem(m);
974: else
975: icmp6_error(m, ICMP6_PARAM_PROB,
976: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 977: return (-1);
1.2 itojun 978: }
979:
980: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 981: return (-1);
1.2 itojun 982: }
983:
984: /*
1.9 itojun 985: * Create the "control" list for this pcb.
986: *
987: * The routine will be called from upper layer handlers like tcp6_input().
988: * Thus the routine assumes that the caller (tcp6_input) have already
989: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
990: * very first mbuf on the mbuf chain.
991: * We may want to add some infinite loop prevention or sanity checks for safety.
992: * (This applies only when you are using KAME mbuf chain restriction, i.e.
993: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 994: */
995: void
996: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 997: struct in6pcb *in6p;
998: struct mbuf **mp;
999: struct ip6_hdr *ip6;
1000: struct mbuf *m;
1.2 itojun 1001: {
1002: struct proc *p = curproc; /* XXX */
1.9 itojun 1003: int privileged;
1.2 itojun 1004:
1.9 itojun 1005: privileged = 0;
1006: if (p && !suser(p->p_ucred, &p->p_acflag))
1007: privileged++;
1008:
1009: #ifdef SO_TIMESTAMP
1.2 itojun 1010: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1011: struct timeval tv;
1012:
1013: microtime(&tv);
1014: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63 itojun 1015: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1016: if (*mp)
1017: mp = &(*mp)->m_next;
1018: }
1.9 itojun 1019: #endif
1.2 itojun 1020: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1021: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1.63 itojun 1022: sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6);
1.2 itojun 1023: if (*mp)
1024: mp = &(*mp)->m_next;
1025: }
1026:
1027: #ifdef noyet
1028: /* options were tossed above */
1029: if (in6p->in6p_flags & IN6P_RECVOPTS)
1030: /* broken */
1031: /* ip6_srcroute doesn't do what we want here, need to fix */
1032: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1033: /* broken */
1034: #endif
1035:
1036: /* RFC 2292 sec. 5 */
1.35 itojun 1037: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1038: struct in6_pktinfo pi6;
1039: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1040: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1041: pi6.ipi6_addr.s6_addr16[1] = 0;
1042: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1043: ? m->m_pkthdr.rcvif->if_index
1044: : 0;
1045: *mp = sbcreatecontrol((caddr_t) &pi6,
1.63 itojun 1046: sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6);
1.2 itojun 1047: if (*mp)
1048: mp = &(*mp)->m_next;
1049: }
1050: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1051: int hlim = ip6->ip6_hlim & 0xff;
1.63 itojun 1052: *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1053: IPV6_HOPLIMIT, IPPROTO_IPV6);
1.2 itojun 1054: if (*mp)
1055: mp = &(*mp)->m_next;
1056: }
1057: /* IN6P_NEXTHOP - for outgoing packet only */
1058:
1059: /*
1060: * IPV6_HOPOPTS socket option. We require super-user privilege
1061: * for the option, but it might be too strict, since there might
1062: * be some hop-by-hop options which can be returned to normal user.
1063: * See RFC 2292 section 6.
1064: */
1.35 itojun 1065: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1066: /*
1067: * Check if a hop-by-hop options header is contatined in the
1068: * received packet, and if so, store the options as ancillary
1069: * data. Note that a hop-by-hop options header must be
1070: * just after the IPv6 header, which fact is assured through
1071: * the IPv6 input processing.
1072: */
1073: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1074: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1075: struct ip6_hbh *hbh;
1076: int hbhlen;
1.62 itojun 1077: struct mbuf *ext;
1.9 itojun 1078:
1.62 itojun 1079: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1080: ip6->ip6_nxt);
1081: if (ext == NULL) {
1.9 itojun 1082: ip6stat.ip6s_tooshort++;
1083: return;
1084: }
1.62 itojun 1085: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1086: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1087: if (hbhlen != ext->m_len) {
1088: m_freem(ext);
1.9 itojun 1089: ip6stat.ip6s_tooshort++;
1090: return;
1091: }
1.2 itojun 1092:
1093: /*
1094: * XXX: We copy whole the header even if a jumbo
1095: * payload option is included, which option is to
1096: * be removed before returning in the RFC 2292.
1097: * But it's too painful operation...
1098: */
1.9 itojun 1099: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.63 itojun 1100: IPV6_HOPOPTS, IPPROTO_IPV6);
1.2 itojun 1101: if (*mp)
1102: mp = &(*mp)->m_next;
1.62 itojun 1103: m_freem(ext);
1.2 itojun 1104: }
1105: }
1106:
1107: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1108: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1109: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60 simonb 1110: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1111:
1112: /*
1113: * Search for destination options headers or routing
1114: * header(s) through the header chain, and stores each
1115: * header as ancillary data.
1116: * Note that the order of the headers remains in
1117: * the chain of ancillary data.
1118: */
1.35 itojun 1119: while (1) { /* is explicit loop prevention necessary? */
1.62 itojun 1120: struct ip6_ext *ip6e = NULL;
1.9 itojun 1121: int elen;
1.62 itojun 1122: struct mbuf *ext = NULL;
1.9 itojun 1123:
1.62 itojun 1124: /*
1125: * if it is not an extension header, don't try to
1126: * pull it from the chain.
1127: */
1128: switch (nxt) {
1129: case IPPROTO_DSTOPTS:
1130: case IPPROTO_ROUTING:
1131: case IPPROTO_HOPOPTS:
1132: case IPPROTO_AH: /* is it possible? */
1133: break;
1134: default:
1135: goto loopend;
1136: }
1137:
1138: ext = ip6_pullexthdr(m, off, nxt);
1139: if (ext == NULL) {
1.9 itojun 1140: ip6stat.ip6s_tooshort++;
1141: return;
1142: }
1.62 itojun 1143: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1144: if (nxt == IPPROTO_AH)
1145: elen = (ip6e->ip6e_len + 2) << 2;
1146: else
1147: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1148: if (elen != ext->m_len) {
1149: m_freem(ext);
1.9 itojun 1150: ip6stat.ip6s_tooshort++;
1151: return;
1152: }
1.57 thorpej 1153: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1154:
1.35 itojun 1155: switch (nxt) {
1.62 itojun 1156: case IPPROTO_DSTOPTS:
1.35 itojun 1157: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1158: break;
1159:
1160: /*
1161: * We also require super-user privilege for
1162: * the option.
1163: * See the comments on IN6_HOPOPTS.
1164: */
1165: if (!privileged)
1166: break;
1167:
1168: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1169: IPV6_DSTOPTS, IPPROTO_IPV6);
1.35 itojun 1170: if (*mp)
1171: mp = &(*mp)->m_next;
1172: break;
1173:
1174: case IPPROTO_ROUTING:
1175: if (!in6p->in6p_flags & IN6P_RTHDR)
1176: break;
1177:
1178: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1179: IPV6_RTHDR, IPPROTO_IPV6);
1.35 itojun 1180: if (*mp)
1181: mp = &(*mp)->m_next;
1182: break;
1183:
1.62 itojun 1184: case IPPROTO_HOPOPTS:
1185: case IPPROTO_AH: /* is it possible? */
1186: break;
1187:
1.35 itojun 1188: default:
1189: /*
1.62 itojun 1190: * other cases have been filtered in the above.
1191: * none will visit this case. here we supply
1192: * the code just in case (nxt overwritten or
1193: * other cases).
1.35 itojun 1194: */
1.62 itojun 1195: m_freem(ext);
1.35 itojun 1196: goto loopend;
1197:
1.2 itojun 1198: }
1199:
1200: /* proceed with the next header. */
1.9 itojun 1201: off += elen;
1.2 itojun 1202: nxt = ip6e->ip6e_nxt;
1.62 itojun 1203: ip6e = NULL;
1204: m_freem(ext);
1205: ext = NULL;
1.2 itojun 1206: }
1207: loopend:
1.62 itojun 1208: ;
1.2 itojun 1209: }
1.62 itojun 1210: }
1211:
1212: /*
1213: * pull single extension header from mbuf chain. returns single mbuf that
1214: * contains the result, or NULL on error.
1215: */
1216: static struct mbuf *
1217: ip6_pullexthdr(m, off, nxt)
1218: struct mbuf *m;
1219: size_t off;
1220: int nxt;
1221: {
1222: struct ip6_ext ip6e;
1223: size_t elen;
1224: struct mbuf *n;
1225:
1226: #ifdef DIAGNOSTIC
1227: switch (nxt) {
1228: case IPPROTO_DSTOPTS:
1229: case IPPROTO_ROUTING:
1230: case IPPROTO_HOPOPTS:
1231: case IPPROTO_AH: /* is it possible? */
1232: break;
1233: default:
1234: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1235: }
1.62 itojun 1236: #endif
1.2 itojun 1237:
1.62 itojun 1238: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1239: if (nxt == IPPROTO_AH)
1240: elen = (ip6e.ip6e_len + 2) << 2;
1241: else
1242: elen = (ip6e.ip6e_len + 1) << 3;
1243:
1244: MGET(n, M_DONTWAIT, MT_DATA);
1245: if (n && elen >= MLEN) {
1246: MCLGET(n, M_DONTWAIT);
1247: if ((n->m_flags & M_EXT) == 0) {
1248: m_free(n);
1249: n = NULL;
1250: }
1251: }
1252: if (!n)
1253: return NULL;
1254:
1255: n->m_len = 0;
1256: if (elen >= M_TRAILINGSPACE(n)) {
1257: m_free(n);
1258: return NULL;
1259: }
1260:
1261: m_copydata(m, off, elen, mtod(n, caddr_t));
1262: n->m_len = elen;
1263: return n;
1.2 itojun 1264: }
1265:
1266: /*
1267: * Get pointer to the previous header followed by the header
1268: * currently processed.
1269: * XXX: This function supposes that
1270: * M includes all headers,
1271: * the next header field and the header length field of each header
1272: * are valid, and
1273: * the sum of each header length equals to OFF.
1274: * Because of these assumptions, this function must be called very
1275: * carefully. Moreover, it will not be used in the near future when
1276: * we develop `neater' mechanism to process extension headers.
1277: */
1.58 itojun 1278: u_int8_t *
1.2 itojun 1279: ip6_get_prevhdr(m, off)
1280: struct mbuf *m;
1281: int off;
1282: {
1283: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1284:
1285: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1286: return (&ip6->ip6_nxt);
1.2 itojun 1287: else {
1288: int len, nxt;
1289: struct ip6_ext *ip6e = NULL;
1290:
1291: nxt = ip6->ip6_nxt;
1292: len = sizeof(struct ip6_hdr);
1293: while (len < off) {
1294: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1295:
1.35 itojun 1296: switch (nxt) {
1.2 itojun 1297: case IPPROTO_FRAGMENT:
1298: len += sizeof(struct ip6_frag);
1299: break;
1300: case IPPROTO_AH:
1301: len += (ip6e->ip6e_len + 2) << 2;
1302: break;
1303: default:
1304: len += (ip6e->ip6e_len + 1) << 3;
1305: break;
1306: }
1307: nxt = ip6e->ip6e_nxt;
1308: }
1309: if (ip6e)
1.58 itojun 1310: return (&ip6e->ip6e_nxt);
1.2 itojun 1311: else
1312: return NULL;
1.18 itojun 1313: }
1314: }
1315:
1316: /*
1317: * get next header offset. m will be retained.
1318: */
1319: int
1320: ip6_nexthdr(m, off, proto, nxtp)
1321: struct mbuf *m;
1322: int off;
1323: int proto;
1324: int *nxtp;
1325: {
1326: struct ip6_hdr ip6;
1327: struct ip6_ext ip6e;
1328: struct ip6_frag fh;
1329:
1330: /* just in case */
1331: if (m == NULL)
1332: panic("ip6_nexthdr: m == NULL");
1333: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1334: return -1;
1335:
1336: switch (proto) {
1337: case IPPROTO_IPV6:
1338: if (m->m_pkthdr.len < off + sizeof(ip6))
1339: return -1;
1340: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1341: if (nxtp)
1342: *nxtp = ip6.ip6_nxt;
1343: off += sizeof(ip6);
1344: return off;
1345:
1346: case IPPROTO_FRAGMENT:
1347: /*
1348: * terminate parsing if it is not the first fragment,
1349: * it does not make sense to parse through it.
1350: */
1351: if (m->m_pkthdr.len < off + sizeof(fh))
1352: return -1;
1353: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1.67 ! itojun 1354: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1355: return -1;
1356: if (nxtp)
1357: *nxtp = fh.ip6f_nxt;
1358: off += sizeof(struct ip6_frag);
1359: return off;
1360:
1361: case IPPROTO_AH:
1362: if (m->m_pkthdr.len < off + sizeof(ip6e))
1363: return -1;
1364: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1365: if (nxtp)
1366: *nxtp = ip6e.ip6e_nxt;
1367: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1368: if (m->m_pkthdr.len < off)
1369: return -1;
1.18 itojun 1370: return off;
1371:
1372: case IPPROTO_HOPOPTS:
1373: case IPPROTO_ROUTING:
1374: case IPPROTO_DSTOPTS:
1375: if (m->m_pkthdr.len < off + sizeof(ip6e))
1376: return -1;
1377: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1378: if (nxtp)
1379: *nxtp = ip6e.ip6e_nxt;
1380: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1381: if (m->m_pkthdr.len < off)
1382: return -1;
1.18 itojun 1383: return off;
1384:
1385: case IPPROTO_NONE:
1386: case IPPROTO_ESP:
1387: case IPPROTO_IPCOMP:
1388: /* give up */
1389: return -1;
1390:
1391: default:
1392: return -1;
1393: }
1394: }
1395:
1396: /*
1397: * get offset for the last header in the chain. m will be kept untainted.
1398: */
1399: int
1400: ip6_lasthdr(m, off, proto, nxtp)
1401: struct mbuf *m;
1402: int off;
1403: int proto;
1404: int *nxtp;
1405: {
1406: int newoff;
1407: int nxt;
1408:
1409: if (!nxtp) {
1410: nxt = -1;
1411: nxtp = &nxt;
1412: }
1413: while (1) {
1414: newoff = ip6_nexthdr(m, off, proto, nxtp);
1415: if (newoff < 0)
1416: return off;
1417: else if (newoff < off)
1418: return -1; /* invalid */
1419: else if (newoff == off)
1420: return newoff;
1421:
1422: off = newoff;
1423: proto = *nxtp;
1.2 itojun 1424: }
1425: }
1426:
1427: /*
1428: * System control for IP6
1429: */
1430:
1431: u_char inet6ctlerrmap[PRC_NCMDS] = {
1432: 0, 0, 0, 0,
1433: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1434: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1435: EMSGSIZE, EHOSTUNREACH, 0, 0,
1436: 0, 0, 0, 0,
1437: ENOPROTOOPT
1438: };
1439:
1440: int
1441: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1442: int *name;
1443: u_int namelen;
1444: void *oldp;
1445: size_t *oldlenp;
1446: void *newp;
1447: size_t newlen;
1448: {
1.26 itojun 1449: int old, error;
1450:
1.2 itojun 1451: /* All sysctl names at this level are terminal. */
1452: if (namelen != 1)
1453: return ENOTDIR;
1454:
1455: switch (name[0]) {
1456:
1457: case IPV6CTL_FORWARDING:
1458: return sysctl_int(oldp, oldlenp, newp, newlen,
1459: &ip6_forwarding);
1460: case IPV6CTL_SENDREDIRECTS:
1461: return sysctl_int(oldp, oldlenp, newp, newlen,
1462: &ip6_sendredirects);
1463: case IPV6CTL_DEFHLIM:
1464: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1465: case IPV6CTL_MAXFRAGPACKETS:
1466: return sysctl_int(oldp, oldlenp, newp, newlen,
1467: &ip6_maxfragpackets);
1468: case IPV6CTL_ACCEPT_RTADV:
1469: return sysctl_int(oldp, oldlenp, newp, newlen,
1470: &ip6_accept_rtadv);
1471: case IPV6CTL_KEEPFAITH:
1472: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1473: case IPV6CTL_LOG_INTERVAL:
1474: return sysctl_int(oldp, oldlenp, newp, newlen,
1475: &ip6_log_interval);
1476: case IPV6CTL_HDRNESTLIMIT:
1477: return sysctl_int(oldp, oldlenp, newp, newlen,
1478: &ip6_hdrnestlimit);
1479: case IPV6CTL_DAD_COUNT:
1480: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1481: case IPV6CTL_AUTO_FLOWLABEL:
1482: return sysctl_int(oldp, oldlenp, newp, newlen,
1483: &ip6_auto_flowlabel);
1484: case IPV6CTL_DEFMCASTHLIM:
1485: return sysctl_int(oldp, oldlenp, newp, newlen,
1486: &ip6_defmcasthlim);
1.51 itojun 1487: #if NGIF > 0
1.2 itojun 1488: case IPV6CTL_GIF_HLIM:
1489: return sysctl_int(oldp, oldlenp, newp, newlen,
1490: &ip6_gif_hlim);
1.51 itojun 1491: #endif
1.2 itojun 1492: case IPV6CTL_KAME_VERSION:
1493: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1494: case IPV6CTL_USE_DEPRECATED:
1495: return sysctl_int(oldp, oldlenp, newp, newlen,
1496: &ip6_use_deprecated);
1.10 itojun 1497: case IPV6CTL_RR_PRUNE:
1498: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1499: case IPV6CTL_V6ONLY:
1500: #ifdef INET6_BINDV6ONLY
1501: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1502: #else
1503: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1504: #endif
1505: case IPV6CTL_ANONPORTMIN:
1506: old = ip6_anonportmin;
1507: error = sysctl_int(oldp, oldlenp, newp, newlen,
1508: &ip6_anonportmin);
1509: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1510: ip6_anonportmin > 65535
1511: #ifndef IPNOPRIVPORTS
1512: || ip6_anonportmin < IPV6PORT_RESERVED
1513: #endif
1514: ) {
1515: ip6_anonportmin = old;
1516: return (EINVAL);
1517: }
1518: return (error);
1519: case IPV6CTL_ANONPORTMAX:
1520: old = ip6_anonportmax;
1521: error = sysctl_int(oldp, oldlenp, newp, newlen,
1522: &ip6_anonportmax);
1523: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1524: ip6_anonportmax > 65535
1525: #ifndef IPNOPRIVPORTS
1526: || ip6_anonportmax < IPV6PORT_RESERVED
1527: #endif
1528: ) {
1529: ip6_anonportmax = old;
1530: return (EINVAL);
1531: }
1532: return (error);
1533: #ifndef IPNOPRIVPORTS
1534: case IPV6CTL_LOWPORTMIN:
1535: old = ip6_lowportmin;
1536: error = sysctl_int(oldp, oldlenp, newp, newlen,
1537: &ip6_lowportmin);
1538: if (ip6_lowportmin >= ip6_lowportmax ||
1539: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1540: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1541: ip6_lowportmin = old;
1542: return (EINVAL);
1543: }
1544: return (error);
1545: case IPV6CTL_LOWPORTMAX:
1546: old = ip6_lowportmax;
1547: error = sysctl_int(oldp, oldlenp, newp, newlen,
1548: &ip6_lowportmax);
1549: if (ip6_lowportmin >= ip6_lowportmax ||
1550: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1551: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1552: ip6_lowportmax = old;
1553: return (EINVAL);
1554: }
1555: return (error);
1.11 itojun 1556: #endif
1.53 itojun 1557: case IPV6CTL_MAXFRAGS:
1558: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2 itojun 1559: default:
1560: return EOPNOTSUPP;
1561: }
1562: /* NOTREACHED */
1563: }
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