Annotation of src/sys/netinet6/ip6_input.c, Revision 1.62
1.62 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.61 2003/05/14 06:47:41 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>
1.62 ! itojun 69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.61 2003/05/14 06:47:41 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;
1.2 itojun 233:
234: #ifdef IPSEC
235: /*
236: * should the inner packet be considered authentic?
237: * see comment in ah4_input().
238: */
1.49 itojun 239: m->m_flags &= ~M_AUTHIPHDR;
240: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 241: #endif
1.9 itojun 242:
1.2 itojun 243: /*
1.44 itojun 244: * mbuf statistics
1.2 itojun 245: */
246: if (m->m_flags & M_EXT) {
247: if (m->m_next)
248: ip6stat.ip6s_mext2m++;
249: else
250: ip6stat.ip6s_mext1++;
251: } else {
1.40 itojun 252: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 253: if (m->m_next) {
1.9 itojun 254: if (m->m_flags & M_LOOP) {
1.44 itojun 255: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 256: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 257: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
258: else
259: ip6stat.ip6s_m2m[0]++;
260: } else
261: ip6stat.ip6s_m1++;
1.40 itojun 262: #undef M2MMAX
1.2 itojun 263: }
264:
1.9 itojun 265: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
266: ip6stat.ip6s_total++;
267:
1.57 thorpej 268: /*
269: * If the IPv6 header is not aligned, slurp it up into a new
270: * mbuf with space for link headers, in the event we forward
271: * it. OTherwise, if it is aligned, make sure the entire base
272: * IPv6 header is in the first mbuf of the chain.
273: */
274: if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
275: struct ifnet *inifp = m->m_pkthdr.rcvif;
276: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
277: (max_linkhdr + 3) & ~3)) == NULL) {
278: /* XXXJRT new stat, please */
279: ip6stat.ip6s_toosmall++;
280: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
281: return;
282: }
283: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
284: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 285: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9 itojun 286: ip6stat.ip6s_toosmall++;
287: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
288: return;
289: }
1.2 itojun 290: }
291:
292: ip6 = mtod(m, struct ip6_hdr *);
293:
294: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
295: ip6stat.ip6s_badvers++;
1.9 itojun 296: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 297: goto bad;
298: }
1.15 darrenr 299:
300: #ifdef PFIL_HOOKS
301: /*
302: * Run through list of hooks for input packets. If there are any
303: * filters which require that additional packets in the flow are
304: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
305: * Note that filters must _never_ set this flag, as another filter
306: * in the list may have previously cleared it.
307: */
1.39 itojun 308: /*
309: * let ipfilter look at packet on the wire,
310: * not the decapsulated packet.
311: */
312: #ifdef IPSEC
1.42 itojun 313: if (!ipsec_getnhist(m))
1.39 itojun 314: #else
315: if (1)
316: #endif
317: {
318: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
319: PFIL_IN) != 0)
320: return;
321: if (m == NULL)
322: return;
323: ip6 = mtod(m, struct ip6_hdr *);
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) {
1.2 itojun 686: ip6_forward(m, 0);
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),
1015: SCM_TIMESTAMP, SOL_SOCKET);
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,
1022: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1023: IPPROTO_IPV6);
1024: if (*mp)
1025: mp = &(*mp)->m_next;
1026: }
1027:
1028: #ifdef noyet
1029: /* options were tossed above */
1030: if (in6p->in6p_flags & IN6P_RECVOPTS)
1031: /* broken */
1032: /* ip6_srcroute doesn't do what we want here, need to fix */
1033: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1034: /* broken */
1035: #endif
1036:
1037: /* RFC 2292 sec. 5 */
1.35 itojun 1038: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1039: struct in6_pktinfo pi6;
1040: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1041: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1042: pi6.ipi6_addr.s6_addr16[1] = 0;
1043: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1044: ? m->m_pkthdr.rcvif->if_index
1045: : 0;
1046: *mp = sbcreatecontrol((caddr_t) &pi6,
1047: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1048: IPPROTO_IPV6);
1049: if (*mp)
1050: mp = &(*mp)->m_next;
1051: }
1052: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1053: int hlim = ip6->ip6_hlim & 0xff;
1054: *mp = sbcreatecontrol((caddr_t) &hlim,
1055: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1056: if (*mp)
1057: mp = &(*mp)->m_next;
1058: }
1059: /* IN6P_NEXTHOP - for outgoing packet only */
1060:
1061: /*
1062: * IPV6_HOPOPTS socket option. We require super-user privilege
1063: * for the option, but it might be too strict, since there might
1064: * be some hop-by-hop options which can be returned to normal user.
1065: * See RFC 2292 section 6.
1066: */
1.35 itojun 1067: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1068: /*
1069: * Check if a hop-by-hop options header is contatined in the
1070: * received packet, and if so, store the options as ancillary
1071: * data. Note that a hop-by-hop options header must be
1072: * just after the IPv6 header, which fact is assured through
1073: * the IPv6 input processing.
1074: */
1075: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1076: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1077: struct ip6_hbh *hbh;
1078: int hbhlen;
1.62 ! itojun 1079: struct mbuf *ext;
1.9 itojun 1080:
1.62 ! itojun 1081: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
! 1082: ip6->ip6_nxt);
! 1083: if (ext == NULL) {
1.9 itojun 1084: ip6stat.ip6s_tooshort++;
1085: return;
1086: }
1.62 ! itojun 1087: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1088: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 ! itojun 1089: if (hbhlen != ext->m_len) {
! 1090: m_freem(ext);
1.9 itojun 1091: ip6stat.ip6s_tooshort++;
1092: return;
1093: }
1.2 itojun 1094:
1095: /*
1096: * XXX: We copy whole the header even if a jumbo
1097: * payload option is included, which option is to
1098: * be removed before returning in the RFC 2292.
1099: * But it's too painful operation...
1100: */
1.9 itojun 1101: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1102: IPV6_HOPOPTS, IPPROTO_IPV6);
1103: if (*mp)
1104: mp = &(*mp)->m_next;
1.62 ! itojun 1105: m_freem(ext);
1.2 itojun 1106: }
1107: }
1108:
1109: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1110: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1111: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60 simonb 1112: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1113:
1114: /*
1115: * Search for destination options headers or routing
1116: * header(s) through the header chain, and stores each
1117: * header as ancillary data.
1118: * Note that the order of the headers remains in
1119: * the chain of ancillary data.
1120: */
1.35 itojun 1121: while (1) { /* is explicit loop prevention necessary? */
1.62 ! itojun 1122: struct ip6_ext *ip6e = NULL;
1.9 itojun 1123: int elen;
1.62 ! itojun 1124: struct mbuf *ext = NULL;
1.9 itojun 1125:
1.62 ! itojun 1126: /*
! 1127: * if it is not an extension header, don't try to
! 1128: * pull it from the chain.
! 1129: */
! 1130: switch (nxt) {
! 1131: case IPPROTO_DSTOPTS:
! 1132: case IPPROTO_ROUTING:
! 1133: case IPPROTO_HOPOPTS:
! 1134: case IPPROTO_AH: /* is it possible? */
! 1135: break;
! 1136: default:
! 1137: goto loopend;
! 1138: }
! 1139:
! 1140: ext = ip6_pullexthdr(m, off, nxt);
! 1141: if (ext == NULL) {
1.9 itojun 1142: ip6stat.ip6s_tooshort++;
1143: return;
1144: }
1.62 ! itojun 1145: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1146: if (nxt == IPPROTO_AH)
1147: elen = (ip6e->ip6e_len + 2) << 2;
1148: else
1149: elen = (ip6e->ip6e_len + 1) << 3;
1.62 ! itojun 1150: if (elen != ext->m_len) {
! 1151: m_freem(ext);
1.9 itojun 1152: ip6stat.ip6s_tooshort++;
1153: return;
1154: }
1.57 thorpej 1155: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1156:
1.35 itojun 1157: switch (nxt) {
1.62 ! itojun 1158: case IPPROTO_DSTOPTS:
1.35 itojun 1159: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1160: break;
1161:
1162: /*
1163: * We also require super-user privilege for
1164: * the option.
1165: * See the comments on IN6_HOPOPTS.
1166: */
1167: if (!privileged)
1168: break;
1169:
1170: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1171: IPV6_DSTOPTS,
1172: IPPROTO_IPV6);
1173: if (*mp)
1174: mp = &(*mp)->m_next;
1175: break;
1176:
1177: case IPPROTO_ROUTING:
1178: if (!in6p->in6p_flags & IN6P_RTHDR)
1179: break;
1180:
1181: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1182: IPV6_RTHDR,
1183: IPPROTO_IPV6);
1184: if (*mp)
1185: mp = &(*mp)->m_next;
1186: break;
1187:
1.62 ! itojun 1188: case IPPROTO_HOPOPTS:
! 1189: case IPPROTO_AH: /* is it possible? */
! 1190: break;
! 1191:
1.35 itojun 1192: default:
1193: /*
1.62 ! itojun 1194: * other cases have been filtered in the above.
! 1195: * none will visit this case. here we supply
! 1196: * the code just in case (nxt overwritten or
! 1197: * other cases).
1.35 itojun 1198: */
1.62 ! itojun 1199: m_freem(ext);
1.35 itojun 1200: goto loopend;
1201:
1.2 itojun 1202: }
1203:
1204: /* proceed with the next header. */
1.9 itojun 1205: off += elen;
1.2 itojun 1206: nxt = ip6e->ip6e_nxt;
1.62 ! itojun 1207: ip6e = NULL;
! 1208: m_freem(ext);
! 1209: ext = NULL;
1.2 itojun 1210: }
1211: loopend:
1.62 ! itojun 1212: ;
1.2 itojun 1213: }
1.62 ! itojun 1214: }
! 1215:
! 1216: /*
! 1217: * pull single extension header from mbuf chain. returns single mbuf that
! 1218: * contains the result, or NULL on error.
! 1219: */
! 1220: static struct mbuf *
! 1221: ip6_pullexthdr(m, off, nxt)
! 1222: struct mbuf *m;
! 1223: size_t off;
! 1224: int nxt;
! 1225: {
! 1226: struct ip6_ext ip6e;
! 1227: size_t elen;
! 1228: struct mbuf *n;
! 1229:
! 1230: #ifdef DIAGNOSTIC
! 1231: switch (nxt) {
! 1232: case IPPROTO_DSTOPTS:
! 1233: case IPPROTO_ROUTING:
! 1234: case IPPROTO_HOPOPTS:
! 1235: case IPPROTO_AH: /* is it possible? */
! 1236: break;
! 1237: default:
! 1238: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1239: }
1.62 ! itojun 1240: #endif
1.2 itojun 1241:
1.62 ! itojun 1242: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
! 1243: if (nxt == IPPROTO_AH)
! 1244: elen = (ip6e.ip6e_len + 2) << 2;
! 1245: else
! 1246: elen = (ip6e.ip6e_len + 1) << 3;
! 1247:
! 1248: MGET(n, M_DONTWAIT, MT_DATA);
! 1249: if (n && elen >= MLEN) {
! 1250: MCLGET(n, M_DONTWAIT);
! 1251: if ((n->m_flags & M_EXT) == 0) {
! 1252: m_free(n);
! 1253: n = NULL;
! 1254: }
! 1255: }
! 1256: if (!n)
! 1257: return NULL;
! 1258:
! 1259: n->m_len = 0;
! 1260: if (elen >= M_TRAILINGSPACE(n)) {
! 1261: m_free(n);
! 1262: return NULL;
! 1263: }
! 1264:
! 1265: m_copydata(m, off, elen, mtod(n, caddr_t));
! 1266: n->m_len = elen;
! 1267: return n;
1.2 itojun 1268: }
1269:
1270: /*
1271: * Get pointer to the previous header followed by the header
1272: * currently processed.
1273: * XXX: This function supposes that
1274: * M includes all headers,
1275: * the next header field and the header length field of each header
1276: * are valid, and
1277: * the sum of each header length equals to OFF.
1278: * Because of these assumptions, this function must be called very
1279: * carefully. Moreover, it will not be used in the near future when
1280: * we develop `neater' mechanism to process extension headers.
1281: */
1.58 itojun 1282: u_int8_t *
1.2 itojun 1283: ip6_get_prevhdr(m, off)
1284: struct mbuf *m;
1285: int off;
1286: {
1287: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1288:
1289: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1290: return (&ip6->ip6_nxt);
1.2 itojun 1291: else {
1292: int len, nxt;
1293: struct ip6_ext *ip6e = NULL;
1294:
1295: nxt = ip6->ip6_nxt;
1296: len = sizeof(struct ip6_hdr);
1297: while (len < off) {
1298: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1299:
1.35 itojun 1300: switch (nxt) {
1.2 itojun 1301: case IPPROTO_FRAGMENT:
1302: len += sizeof(struct ip6_frag);
1303: break;
1304: case IPPROTO_AH:
1305: len += (ip6e->ip6e_len + 2) << 2;
1306: break;
1307: default:
1308: len += (ip6e->ip6e_len + 1) << 3;
1309: break;
1310: }
1311: nxt = ip6e->ip6e_nxt;
1312: }
1313: if (ip6e)
1.58 itojun 1314: return (&ip6e->ip6e_nxt);
1.2 itojun 1315: else
1316: return NULL;
1.18 itojun 1317: }
1318: }
1319:
1320: /*
1321: * get next header offset. m will be retained.
1322: */
1323: int
1324: ip6_nexthdr(m, off, proto, nxtp)
1325: struct mbuf *m;
1326: int off;
1327: int proto;
1328: int *nxtp;
1329: {
1330: struct ip6_hdr ip6;
1331: struct ip6_ext ip6e;
1332: struct ip6_frag fh;
1333:
1334: /* just in case */
1335: if (m == NULL)
1336: panic("ip6_nexthdr: m == NULL");
1337: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1338: return -1;
1339:
1340: switch (proto) {
1341: case IPPROTO_IPV6:
1342: if (m->m_pkthdr.len < off + sizeof(ip6))
1343: return -1;
1344: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1345: if (nxtp)
1346: *nxtp = ip6.ip6_nxt;
1347: off += sizeof(ip6);
1348: return off;
1349:
1350: case IPPROTO_FRAGMENT:
1351: /*
1352: * terminate parsing if it is not the first fragment,
1353: * it does not make sense to parse through it.
1354: */
1355: if (m->m_pkthdr.len < off + sizeof(fh))
1356: return -1;
1357: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1358: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1359: return -1;
1360: if (nxtp)
1361: *nxtp = fh.ip6f_nxt;
1362: off += sizeof(struct ip6_frag);
1363: return off;
1364:
1365: case IPPROTO_AH:
1366: if (m->m_pkthdr.len < off + sizeof(ip6e))
1367: return -1;
1368: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1369: if (nxtp)
1370: *nxtp = ip6e.ip6e_nxt;
1371: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1372: if (m->m_pkthdr.len < off)
1373: return -1;
1.18 itojun 1374: return off;
1375:
1376: case IPPROTO_HOPOPTS:
1377: case IPPROTO_ROUTING:
1378: case IPPROTO_DSTOPTS:
1379: if (m->m_pkthdr.len < off + sizeof(ip6e))
1380: return -1;
1381: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1382: if (nxtp)
1383: *nxtp = ip6e.ip6e_nxt;
1384: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1385: if (m->m_pkthdr.len < off)
1386: return -1;
1.18 itojun 1387: return off;
1388:
1389: case IPPROTO_NONE:
1390: case IPPROTO_ESP:
1391: case IPPROTO_IPCOMP:
1392: /* give up */
1393: return -1;
1394:
1395: default:
1396: return -1;
1397: }
1398: }
1399:
1400: /*
1401: * get offset for the last header in the chain. m will be kept untainted.
1402: */
1403: int
1404: ip6_lasthdr(m, off, proto, nxtp)
1405: struct mbuf *m;
1406: int off;
1407: int proto;
1408: int *nxtp;
1409: {
1410: int newoff;
1411: int nxt;
1412:
1413: if (!nxtp) {
1414: nxt = -1;
1415: nxtp = &nxt;
1416: }
1417: while (1) {
1418: newoff = ip6_nexthdr(m, off, proto, nxtp);
1419: if (newoff < 0)
1420: return off;
1421: else if (newoff < off)
1422: return -1; /* invalid */
1423: else if (newoff == off)
1424: return newoff;
1425:
1426: off = newoff;
1427: proto = *nxtp;
1.2 itojun 1428: }
1429: }
1430:
1431: /*
1432: * System control for IP6
1433: */
1434:
1435: u_char inet6ctlerrmap[PRC_NCMDS] = {
1436: 0, 0, 0, 0,
1437: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1438: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1439: EMSGSIZE, EHOSTUNREACH, 0, 0,
1440: 0, 0, 0, 0,
1441: ENOPROTOOPT
1442: };
1443:
1444: int
1445: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1446: int *name;
1447: u_int namelen;
1448: void *oldp;
1449: size_t *oldlenp;
1450: void *newp;
1451: size_t newlen;
1452: {
1.26 itojun 1453: int old, error;
1454:
1.2 itojun 1455: /* All sysctl names at this level are terminal. */
1456: if (namelen != 1)
1457: return ENOTDIR;
1458:
1459: switch (name[0]) {
1460:
1461: case IPV6CTL_FORWARDING:
1462: return sysctl_int(oldp, oldlenp, newp, newlen,
1463: &ip6_forwarding);
1464: case IPV6CTL_SENDREDIRECTS:
1465: return sysctl_int(oldp, oldlenp, newp, newlen,
1466: &ip6_sendredirects);
1467: case IPV6CTL_DEFHLIM:
1468: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1469: case IPV6CTL_MAXFRAGPACKETS:
1470: return sysctl_int(oldp, oldlenp, newp, newlen,
1471: &ip6_maxfragpackets);
1472: case IPV6CTL_ACCEPT_RTADV:
1473: return sysctl_int(oldp, oldlenp, newp, newlen,
1474: &ip6_accept_rtadv);
1475: case IPV6CTL_KEEPFAITH:
1476: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1477: case IPV6CTL_LOG_INTERVAL:
1478: return sysctl_int(oldp, oldlenp, newp, newlen,
1479: &ip6_log_interval);
1480: case IPV6CTL_HDRNESTLIMIT:
1481: return sysctl_int(oldp, oldlenp, newp, newlen,
1482: &ip6_hdrnestlimit);
1483: case IPV6CTL_DAD_COUNT:
1484: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1485: case IPV6CTL_AUTO_FLOWLABEL:
1486: return sysctl_int(oldp, oldlenp, newp, newlen,
1487: &ip6_auto_flowlabel);
1488: case IPV6CTL_DEFMCASTHLIM:
1489: return sysctl_int(oldp, oldlenp, newp, newlen,
1490: &ip6_defmcasthlim);
1.51 itojun 1491: #if NGIF > 0
1.2 itojun 1492: case IPV6CTL_GIF_HLIM:
1493: return sysctl_int(oldp, oldlenp, newp, newlen,
1494: &ip6_gif_hlim);
1.51 itojun 1495: #endif
1.2 itojun 1496: case IPV6CTL_KAME_VERSION:
1497: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1498: case IPV6CTL_USE_DEPRECATED:
1499: return sysctl_int(oldp, oldlenp, newp, newlen,
1500: &ip6_use_deprecated);
1.10 itojun 1501: case IPV6CTL_RR_PRUNE:
1502: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1503: case IPV6CTL_V6ONLY:
1504: #ifdef INET6_BINDV6ONLY
1505: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1506: #else
1507: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1508: #endif
1509: case IPV6CTL_ANONPORTMIN:
1510: old = ip6_anonportmin;
1511: error = sysctl_int(oldp, oldlenp, newp, newlen,
1512: &ip6_anonportmin);
1513: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1514: ip6_anonportmin > 65535
1515: #ifndef IPNOPRIVPORTS
1516: || ip6_anonportmin < IPV6PORT_RESERVED
1517: #endif
1518: ) {
1519: ip6_anonportmin = old;
1520: return (EINVAL);
1521: }
1522: return (error);
1523: case IPV6CTL_ANONPORTMAX:
1524: old = ip6_anonportmax;
1525: error = sysctl_int(oldp, oldlenp, newp, newlen,
1526: &ip6_anonportmax);
1527: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1528: ip6_anonportmax > 65535
1529: #ifndef IPNOPRIVPORTS
1530: || ip6_anonportmax < IPV6PORT_RESERVED
1531: #endif
1532: ) {
1533: ip6_anonportmax = old;
1534: return (EINVAL);
1535: }
1536: return (error);
1537: #ifndef IPNOPRIVPORTS
1538: case IPV6CTL_LOWPORTMIN:
1539: old = ip6_lowportmin;
1540: error = sysctl_int(oldp, oldlenp, newp, newlen,
1541: &ip6_lowportmin);
1542: if (ip6_lowportmin >= ip6_lowportmax ||
1543: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1544: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1545: ip6_lowportmin = old;
1546: return (EINVAL);
1547: }
1548: return (error);
1549: case IPV6CTL_LOWPORTMAX:
1550: old = ip6_lowportmax;
1551: error = sysctl_int(oldp, oldlenp, newp, newlen,
1552: &ip6_lowportmax);
1553: if (ip6_lowportmin >= ip6_lowportmax ||
1554: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1555: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1556: ip6_lowportmax = old;
1557: return (EINVAL);
1558: }
1559: return (error);
1.11 itojun 1560: #endif
1.53 itojun 1561: case IPV6CTL_MAXFRAGS:
1562: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2 itojun 1563: default:
1564: return EOPNOTSUPP;
1565: }
1566: /* NOTREACHED */
1567: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to ip6_input.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / sys / netinet6