Annotation of src/sys/netinet6/ip6_input.c, Revision 1.65
1.65 ! agc 1: /* $NetBSD: ip6_input.c,v 1.64 2003/06/30 08:00:59 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>
1.65 ! agc 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.64 2003/06/30 08:00:59 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();
1.54 itojun 173: ip6_flow_seq = arc4random();
1.2 itojun 174:
175: ip6_init2((void *)0);
1.29 thorpej 176:
177: #ifdef PFIL_HOOKS
178: /* Register our Packet Filter hook. */
1.33 thorpej 179: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
180: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 181: i = pfil_head_register(&inet6_pfil_hook);
182: if (i != 0)
183: printf("ip6_init: WARNING: unable to register pfil hook, "
184: "error %d\n", i);
185: #endif /* PFIL_HOOKS */
1.2 itojun 186: }
187:
188: static void
189: ip6_init2(dummy)
190: void *dummy;
191: {
192:
193: /* nd6_timer_init */
1.19 thorpej 194: callout_init(&nd6_timer_ch);
195: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2 itojun 196: }
197:
198: /*
199: * IP6 input interrupt handling. Just pass the packet to ip6_input.
200: */
201: void
202: ip6intr()
203: {
204: int s;
205: struct mbuf *m;
206:
207: for (;;) {
1.41 thorpej 208: s = splnet();
1.2 itojun 209: IF_DEQUEUE(&ip6intrq, m);
210: splx(s);
211: if (m == 0)
212: return;
213: ip6_input(m);
214: }
215: }
216:
217: extern struct route_in6 ip6_forward_rt;
218:
219: void
220: ip6_input(m)
221: struct mbuf *m;
222: {
1.9 itojun 223: struct ip6_hdr *ip6;
1.2 itojun 224: int off = sizeof(struct ip6_hdr), nest;
225: u_int32_t plen;
1.5 itojun 226: u_int32_t rtalert = ~0;
1.2 itojun 227: int nxt, ours = 0;
1.9 itojun 228: struct ifnet *deliverifp = NULL;
1.64 itojun 229: int srcrt = 0;
1.2 itojun 230:
231: #ifdef IPSEC
232: /*
233: * should the inner packet be considered authentic?
234: * see comment in ah4_input().
235: */
1.49 itojun 236: m->m_flags &= ~M_AUTHIPHDR;
237: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 238: #endif
1.9 itojun 239:
1.2 itojun 240: /*
1.44 itojun 241: * mbuf statistics
1.2 itojun 242: */
243: if (m->m_flags & M_EXT) {
244: if (m->m_next)
245: ip6stat.ip6s_mext2m++;
246: else
247: ip6stat.ip6s_mext1++;
248: } else {
1.40 itojun 249: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 250: if (m->m_next) {
1.9 itojun 251: if (m->m_flags & M_LOOP) {
1.44 itojun 252: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 253: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 254: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
255: else
256: ip6stat.ip6s_m2m[0]++;
257: } else
258: ip6stat.ip6s_m1++;
1.40 itojun 259: #undef M2MMAX
1.2 itojun 260: }
261:
1.9 itojun 262: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
263: ip6stat.ip6s_total++;
264:
1.57 thorpej 265: /*
266: * If the IPv6 header is not aligned, slurp it up into a new
267: * mbuf with space for link headers, in the event we forward
268: * it. OTherwise, if it is aligned, make sure the entire base
269: * IPv6 header is in the first mbuf of the chain.
270: */
271: if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
272: struct ifnet *inifp = m->m_pkthdr.rcvif;
273: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
274: (max_linkhdr + 3) & ~3)) == NULL) {
275: /* XXXJRT new stat, please */
276: ip6stat.ip6s_toosmall++;
277: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
278: return;
279: }
280: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
281: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 282: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9 itojun 283: ip6stat.ip6s_toosmall++;
284: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
285: return;
286: }
1.2 itojun 287: }
288:
289: ip6 = mtod(m, struct ip6_hdr *);
290:
291: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
292: ip6stat.ip6s_badvers++;
1.9 itojun 293: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 294: goto bad;
295: }
1.15 darrenr 296:
297: #ifdef PFIL_HOOKS
298: /*
299: * Run through list of hooks for input packets. If there are any
300: * filters which require that additional packets in the flow are
301: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
302: * Note that filters must _never_ set this flag, as another filter
303: * in the list may have previously cleared it.
304: */
1.39 itojun 305: /*
306: * let ipfilter look at packet on the wire,
307: * not the decapsulated packet.
308: */
309: #ifdef IPSEC
1.42 itojun 310: if (!ipsec_getnhist(m))
1.39 itojun 311: #else
312: if (1)
313: #endif
314: {
1.64 itojun 315: struct in6_addr odst;
316:
317: odst = ip6->ip6_dst;
1.39 itojun 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 *);
1.64 itojun 324: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 325: }
1.15 darrenr 326: #endif /* PFIL_HOOKS */
327:
1.2 itojun 328: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
329:
1.30 thorpej 330: #ifdef ALTQ
331: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
332: /* packet is dropped by traffic conditioner */
333: return;
1.9 itojun 334: }
335: #endif
336:
1.2 itojun 337: /*
1.44 itojun 338: * Check against address spoofing/corruption.
1.2 itojun 339: */
340: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
341: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 342: /*
343: * XXX: "badscope" is not very suitable for a multicast source.
344: */
1.2 itojun 345: ip6stat.ip6s_badscope++;
1.9 itojun 346: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 347: goto bad;
348: }
1.13 itojun 349: /*
1.44 itojun 350: * The following check is not documented in specs. A malicious
351: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
352: * and bypass security checks (act as if it was from 127.0.0.1 by using
353: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 354: *
1.44 itojun 355: * This check chokes if we are in an SIIT cloud. As none of BSDs
356: * support IPv4-less kernel compilation, we cannot support SIIT
357: * environment at all. So, it makes more sense for us to reject any
358: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 359: * partial support for SIIT environment.
1.13 itojun 360: */
361: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
362: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
363: ip6stat.ip6s_badscope++;
364: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
365: goto bad;
366: }
1.17 itojun 367: #if 0
1.13 itojun 368: /*
1.17 itojun 369: * Reject packets with IPv4 compatible addresses (auto tunnel).
370: *
371: * The code forbids auto tunnel relay case in RFC1933 (the check is
372: * stronger than RFC1933). We may want to re-enable it if mech-xx
373: * is revised to forbid relaying case.
1.13 itojun 374: */
375: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
376: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
377: ip6stat.ip6s_badscope++;
378: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
379: goto bad;
380: }
381: #endif
1.35 itojun 382:
1.2 itojun 383: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
384: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
385: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
386: ours = 1;
1.9 itojun 387: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 388: goto hbhcheck;
389: } else {
390: ip6stat.ip6s_badscope++;
1.9 itojun 391: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 392: goto bad;
393: }
394: }
395:
1.38 itojun 396: /* drop packets if interface ID portion is already filled */
397: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
398: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
399: ip6->ip6_src.s6_addr16[1]) {
400: ip6stat.ip6s_badscope++;
401: goto bad;
402: }
403: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
404: ip6->ip6_dst.s6_addr16[1]) {
405: ip6stat.ip6s_badscope++;
406: goto bad;
407: }
408: }
1.2 itojun 409:
1.40 itojun 410: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
411: ip6->ip6_src.s6_addr16[1]
412: = htons(m->m_pkthdr.rcvif->if_index);
413: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
414: ip6->ip6_dst.s6_addr16[1]
415: = htons(m->m_pkthdr.rcvif->if_index);
416:
417: /*
418: * We use rt->rt_ifp to determine if the address is ours or not.
419: * If rt_ifp is lo0, the address is ours.
420: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
421: * so any address under fe80::%lo0/64 will be mistakenly considered
422: * local. The special case is supplied to handle the case properly
423: * by actually looking at interface addresses
424: * (using in6ifa_ifpwithaddr).
425: */
426: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
427: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
428: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
429: icmp6_error(m, ICMP6_DST_UNREACH,
430: ICMP6_DST_UNREACH_ADDR, 0);
431: /* m is already freed */
432: return;
1.21 itojun 433: }
1.40 itojun 434:
435: ours = 1;
436: deliverifp = m->m_pkthdr.rcvif;
437: goto hbhcheck;
1.9 itojun 438: }
439:
1.2 itojun 440: /*
441: * Multicast check
442: */
443: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
444: struct in6_multi *in6m = 0;
1.9 itojun 445:
446: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 447: /*
448: * See if we belong to the destination multicast group on the
449: * arrival interface.
450: */
451: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
452: if (in6m)
453: ours = 1;
454: else if (!ip6_mrouter) {
455: ip6stat.ip6s_notmember++;
456: ip6stat.ip6s_cantforward++;
1.9 itojun 457: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 458: goto bad;
459: }
1.9 itojun 460: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 461: goto hbhcheck;
462: }
463:
464: /*
465: * Unicast check
466: */
1.22 itojun 467: if (ip6_forward_rt.ro_rt != NULL &&
1.55 itojun 468: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22 itojun 469: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 470: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 471: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 472: else {
1.35 itojun 473: struct sockaddr_in6 *dst6;
474:
1.2 itojun 475: if (ip6_forward_rt.ro_rt) {
1.22 itojun 476: /* route is down or destination is different */
1.25 itojun 477: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 478: RTFREE(ip6_forward_rt.ro_rt);
479: ip6_forward_rt.ro_rt = 0;
480: }
1.22 itojun 481:
1.2 itojun 482: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 483: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
484: dst6->sin6_len = sizeof(struct sockaddr_in6);
485: dst6->sin6_family = AF_INET6;
486: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 487:
1.9 itojun 488: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 489: }
490:
491: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
492:
493: /*
494: * Accept the packet if the forwarding interface to the destination
495: * according to the routing table is the loopback interface,
496: * unless the associated route has a gateway.
497: * Note that this approach causes to accept a packet if there is a
498: * route to the loopback interface for the destination of the packet.
499: * But we think it's even useful in some situations, e.g. when using
500: * a special daemon which wants to intercept the packet.
501: */
502: if (ip6_forward_rt.ro_rt &&
503: (ip6_forward_rt.ro_rt->rt_flags &
504: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55 itojun 505: !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2 itojun 506: #if 0
507: /*
508: * The check below is redundant since the comparison of
509: * the destination and the key of the rtentry has
510: * already done through looking up the routing table.
511: */
512: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55 itojun 513: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2 itojun 514: #endif
1.9 itojun 515: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 516: struct in6_ifaddr *ia6 =
517: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
518: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
519: m->m_flags |= M_ANYCAST6;
1.24 itojun 520: /*
521: * packets to a tentative, duplicated, or somehow invalid
522: * address must not be accepted.
523: */
1.2 itojun 524: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 525: /* this address is ready */
1.2 itojun 526: ours = 1;
1.9 itojun 527: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 528: goto hbhcheck;
529: } else {
1.24 itojun 530: /* address is not ready, so discard the packet. */
1.34 itojun 531: nd6log((LOG_INFO,
1.27 itojun 532: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 533: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 534: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 535:
536: goto bad;
1.2 itojun 537: }
538: }
539:
540: /*
1.55 itojun 541: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 542: */
543: #if defined(NFAITH) && 0 < NFAITH
544: if (ip6_keepfaith) {
545: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
546: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
547: /* XXX do we need more sanity checks? */
548: ours = 1;
1.45 itojun 549: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 550: goto hbhcheck;
551: }
552: }
553: #endif
554:
555: #if 0
556: {
557: /*
558: * Last resort: check in6_ifaddr for incoming interface.
559: * The code is here until I update the "goto ours hack" code above
560: * working right.
561: */
562: struct ifaddr *ifa;
563: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
564: ifa;
565: ifa = ifa->ifa_list.tqe_next) {
566: if (ifa->ifa_addr == NULL)
567: continue; /* just for safety */
568: if (ifa->ifa_addr->sa_family != AF_INET6)
569: continue;
570: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
571: ours = 1;
572: deliverifp = ifa->ifa_ifp;
1.2 itojun 573: goto hbhcheck;
574: }
575: }
1.9 itojun 576: }
1.2 itojun 577: #endif
578:
579: /*
580: * Now there is no reason to process the packet if it's not our own
581: * and we're not a router.
582: */
583: if (!ip6_forwarding) {
584: ip6stat.ip6s_cantforward++;
1.9 itojun 585: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 586: goto bad;
587: }
588:
589: hbhcheck:
590: /*
591: * Process Hop-by-Hop options header if it's contained.
592: * m may be modified in ip6_hopopts_input().
593: * If a JumboPayload option is included, plen will also be modified.
594: */
595: plen = (u_int32_t)ntohs(ip6->ip6_plen);
596: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 597: struct ip6_hbh *hbh;
598:
599: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
600: #if 0 /*touches NULL pointer*/
601: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
602: #endif
1.2 itojun 603: return; /* m have already been freed */
1.9 itojun 604: }
1.22 itojun 605:
1.2 itojun 606: /* adjust pointer */
607: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 608:
609: /*
1.49 itojun 610: * if the payload length field is 0 and the next header field
1.22 itojun 611: * indicates Hop-by-Hop Options header, then a Jumbo Payload
612: * option MUST be included.
613: */
614: if (ip6->ip6_plen == 0 && plen == 0) {
615: /*
616: * Note that if a valid jumbo payload option is
617: * contained, ip6_hoptops_input() must set a valid
1.55 itojun 618: * (non-zero) payload length to the variable plen.
1.22 itojun 619: */
620: ip6stat.ip6s_badoptions++;
621: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
622: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
623: icmp6_error(m, ICMP6_PARAM_PROB,
624: ICMP6_PARAMPROB_HEADER,
625: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
626: return;
627: }
1.9 itojun 628: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
629: sizeof(struct ip6_hbh));
630: if (hbh == NULL) {
631: ip6stat.ip6s_tooshort++;
632: return;
633: }
1.57 thorpej 634: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 635: nxt = hbh->ip6h_nxt;
1.2 itojun 636:
637: /*
638: * accept the packet if a router alert option is included
639: * and we act as an IPv6 router.
640: */
1.5 itojun 641: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 642: ours = 1;
643: } else
644: nxt = ip6->ip6_nxt;
645:
646: /*
647: * Check that the amount of data in the buffers
648: * is as at least much as the IPv6 header would have us expect.
649: * Trim mbufs if longer than we expect.
650: * Drop packet if shorter than we expect.
651: */
652: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
653: ip6stat.ip6s_tooshort++;
1.9 itojun 654: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 655: goto bad;
656: }
657: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
658: if (m->m_len == m->m_pkthdr.len) {
659: m->m_len = sizeof(struct ip6_hdr) + plen;
660: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
661: } else
662: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
663: }
664:
665: /*
666: * Forward if desirable.
667: */
668: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
669: /*
670: * If we are acting as a multicast router, all
671: * incoming multicast packets are passed to the
672: * kernel-level multicast forwarding function.
673: * The packet is returned (relatively) intact; if
674: * ip6_mforward() returns a non-zero value, the packet
675: * must be discarded, else it may be accepted below.
676: */
677: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
678: ip6stat.ip6s_cantforward++;
679: m_freem(m);
680: return;
681: }
682: if (!ours) {
683: m_freem(m);
684: return;
685: }
1.22 itojun 686: } else if (!ours) {
1.64 itojun 687: ip6_forward(m, srcrt);
1.2 itojun 688: return;
1.56 itojun 689: }
1.25 itojun 690:
691: ip6 = mtod(m, struct ip6_hdr *);
692:
693: /*
694: * Malicious party may be able to use IPv4 mapped addr to confuse
695: * tcp/udp stack and bypass security checks (act as if it was from
696: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
697: *
698: * For SIIT end node behavior, you may want to disable the check.
699: * However, you will become vulnerable to attacks using IPv4 mapped
700: * source.
701: */
702: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
703: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
704: ip6stat.ip6s_badscope++;
705: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
706: goto bad;
707: }
1.2 itojun 708:
709: /*
710: * Tell launch routine the next header
711: */
1.12 itojun 712: #ifdef IFA_STATS
1.28 itojun 713: if (deliverifp != NULL) {
1.9 itojun 714: struct in6_ifaddr *ia6;
715: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
716: if (ia6)
717: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
718: }
719: #endif
1.2 itojun 720: ip6stat.ip6s_delivered++;
1.9 itojun 721: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 722: nest = 0;
1.40 itojun 723:
1.2 itojun 724: while (nxt != IPPROTO_DONE) {
725: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
726: ip6stat.ip6s_toomanyhdr++;
727: goto bad;
728: }
1.8 itojun 729:
730: /*
731: * protection against faulty packet - there should be
732: * more sanity checks in header chain processing.
733: */
734: if (m->m_pkthdr.len < off) {
735: ip6stat.ip6s_tooshort++;
1.9 itojun 736: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 737: goto bad;
738: }
739:
1.37 itojun 740: #ifdef IPSEC
741: /*
742: * enforce IPsec policy checking if we are seeing last header.
743: * note that we do not visit this with protocols with pcb layer
744: * code - like udp/tcp/raw ip.
745: */
746: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
747: ipsec6_in_reject(m, NULL)) {
748: ipsec6stat.in_polvio++;
749: goto bad;
750: }
751: #endif
1.56 itojun 752:
1.2 itojun 753: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
754: }
755: return;
756: bad:
757: m_freem(m);
758: }
759:
760: /*
761: * Hop-by-Hop options header processing. If a valid jumbo payload option is
762: * included, the real payload length will be stored in plenp.
763: */
764: static int
765: ip6_hopopts_input(plenp, rtalertp, mp, offp)
766: u_int32_t *plenp;
1.5 itojun 767: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 768: struct mbuf **mp;
769: int *offp;
770: {
1.35 itojun 771: struct mbuf *m = *mp;
1.2 itojun 772: int off = *offp, hbhlen;
773: struct ip6_hbh *hbh;
774: u_int8_t *opt;
775:
776: /* validation of the length of the header */
1.9 itojun 777: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
778: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
779: if (hbh == NULL) {
780: ip6stat.ip6s_tooshort++;
781: return -1;
782: }
783: hbhlen = (hbh->ip6h_len + 1) << 3;
784: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
785: hbhlen);
786: if (hbh == NULL) {
787: ip6stat.ip6s_tooshort++;
788: return -1;
789: }
1.57 thorpej 790: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 791: off += hbhlen;
792: hbhlen -= sizeof(struct ip6_hbh);
793: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
794:
795: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
796: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 797: return (-1);
1.2 itojun 798:
799: *offp = off;
800: *mp = m;
1.58 itojun 801: return (0);
1.2 itojun 802: }
803:
804: /*
805: * Search header for all Hop-by-hop options and process each option.
806: * This function is separate from ip6_hopopts_input() in order to
807: * handle a case where the sending node itself process its hop-by-hop
808: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 809: *
810: * The function assumes that hbh header is located right after the IPv6 header
811: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
812: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 813: */
814: int
815: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
816: struct mbuf *m;
817: u_int8_t *opthead;
818: int hbhlen;
1.5 itojun 819: u_int32_t *rtalertp;
1.2 itojun 820: u_int32_t *plenp;
821: {
822: struct ip6_hdr *ip6;
823: int optlen = 0;
824: u_int8_t *opt = opthead;
825: u_int16_t rtalert_val;
1.22 itojun 826: u_int32_t jumboplen;
1.55 itojun 827: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 828:
829: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 830: switch (*opt) {
831: case IP6OPT_PAD1:
832: optlen = 1;
833: break;
834: case IP6OPT_PADN:
835: if (hbhlen < IP6OPT_MINLEN) {
836: ip6stat.ip6s_toosmall++;
837: goto bad;
838: }
839: optlen = *(opt + 1) + 2;
840: break;
841: case IP6OPT_RTALERT:
842: /* XXX may need check for alignment */
843: if (hbhlen < IP6OPT_RTALERT_LEN) {
844: ip6stat.ip6s_toosmall++;
845: goto bad;
846: }
847: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 848: /* XXX stat */
849: icmp6_error(m, ICMP6_PARAM_PROB,
850: ICMP6_PARAMPROB_HEADER,
851: erroff + opt + 1 - opthead);
852: return (-1);
1.35 itojun 853: }
854: optlen = IP6OPT_RTALERT_LEN;
855: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
856: *rtalertp = ntohs(rtalert_val);
857: break;
858: case IP6OPT_JUMBO:
1.22 itojun 859: /* XXX may need check for alignment */
860: if (hbhlen < IP6OPT_JUMBO_LEN) {
861: ip6stat.ip6s_toosmall++;
862: goto bad;
863: }
1.35 itojun 864: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 865: /* XXX stat */
866: icmp6_error(m, ICMP6_PARAM_PROB,
867: ICMP6_PARAMPROB_HEADER,
868: erroff + opt + 1 - opthead);
869: return (-1);
1.35 itojun 870: }
1.22 itojun 871: optlen = IP6OPT_JUMBO_LEN;
872:
873: /*
874: * IPv6 packets that have non 0 payload length
1.35 itojun 875: * must not contain a jumbo payload option.
1.22 itojun 876: */
877: ip6 = mtod(m, struct ip6_hdr *);
878: if (ip6->ip6_plen) {
879: ip6stat.ip6s_badoptions++;
880: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 881: ICMP6_PARAMPROB_HEADER,
882: erroff + opt - opthead);
883: return (-1);
1.22 itojun 884: }
1.2 itojun 885:
1.22 itojun 886: /*
887: * We may see jumbolen in unaligned location, so
888: * we'd need to perform bcopy().
889: */
890: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
891: jumboplen = (u_int32_t)htonl(jumboplen);
892:
893: #if 1
894: /*
895: * if there are multiple jumbo payload options,
896: * *plenp will be non-zero and the packet will be
897: * rejected.
898: * the behavior may need some debate in ipngwg -
899: * multiple options does not make sense, however,
900: * there's no explicit mention in specification.
901: */
902: if (*plenp != 0) {
903: ip6stat.ip6s_badoptions++;
904: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 905: ICMP6_PARAMPROB_HEADER,
906: erroff + opt + 2 - opthead);
907: return (-1);
1.22 itojun 908: }
1.8 itojun 909: #endif
1.2 itojun 910:
1.22 itojun 911: /*
912: * jumbo payload length must be larger than 65535.
913: */
914: if (jumboplen <= IPV6_MAXPACKET) {
915: ip6stat.ip6s_badoptions++;
916: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 917: ICMP6_PARAMPROB_HEADER,
918: erroff + opt + 2 - opthead);
919: return (-1);
1.22 itojun 920: }
921: *plenp = jumboplen;
922:
923: break;
1.35 itojun 924: default: /* unknown option */
925: if (hbhlen < IP6OPT_MINLEN) {
926: ip6stat.ip6s_toosmall++;
927: goto bad;
928: }
1.55 itojun 929: optlen = ip6_unknown_opt(opt, m,
930: erroff + opt - opthead);
931: if (optlen == -1)
932: return (-1);
1.35 itojun 933: optlen += 2;
934: break;
1.2 itojun 935: }
936: }
937:
1.55 itojun 938: return (0);
1.2 itojun 939:
940: bad:
941: m_freem(m);
1.55 itojun 942: return (-1);
1.2 itojun 943: }
944:
945: /*
946: * Unknown option processing.
947: * The third argument `off' is the offset from the IPv6 header to the option,
948: * which is necessary if the IPv6 header the and option header and IPv6 header
949: * is not continuous in order to return an ICMPv6 error.
950: */
951: int
952: ip6_unknown_opt(optp, m, off)
953: u_int8_t *optp;
954: struct mbuf *m;
955: int off;
956: {
957: struct ip6_hdr *ip6;
958:
1.35 itojun 959: switch (IP6OPT_TYPE(*optp)) {
960: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 961: return ((int)*(optp + 1));
1.35 itojun 962: case IP6OPT_TYPE_DISCARD: /* silently discard */
963: m_freem(m);
1.58 itojun 964: return (-1);
1.35 itojun 965: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
966: ip6stat.ip6s_badoptions++;
967: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 968: return (-1);
1.35 itojun 969: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
970: ip6stat.ip6s_badoptions++;
971: ip6 = mtod(m, struct ip6_hdr *);
972: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
973: (m->m_flags & (M_BCAST|M_MCAST)))
974: m_freem(m);
975: else
976: icmp6_error(m, ICMP6_PARAM_PROB,
977: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 978: return (-1);
1.2 itojun 979: }
980:
981: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 982: return (-1);
1.2 itojun 983: }
984:
985: /*
1.9 itojun 986: * Create the "control" list for this pcb.
987: *
988: * The routine will be called from upper layer handlers like tcp6_input().
989: * Thus the routine assumes that the caller (tcp6_input) have already
990: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
991: * very first mbuf on the mbuf chain.
992: * We may want to add some infinite loop prevention or sanity checks for safety.
993: * (This applies only when you are using KAME mbuf chain restriction, i.e.
994: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 995: */
996: void
997: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 998: struct in6pcb *in6p;
999: struct mbuf **mp;
1000: struct ip6_hdr *ip6;
1001: struct mbuf *m;
1.2 itojun 1002: {
1003: struct proc *p = curproc; /* XXX */
1.9 itojun 1004: int privileged;
1.2 itojun 1005:
1.9 itojun 1006: privileged = 0;
1007: if (p && !suser(p->p_ucred, &p->p_acflag))
1008: privileged++;
1009:
1010: #ifdef SO_TIMESTAMP
1.2 itojun 1011: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1012: struct timeval tv;
1013:
1014: microtime(&tv);
1015: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63 itojun 1016: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1017: if (*mp)
1018: mp = &(*mp)->m_next;
1019: }
1.9 itojun 1020: #endif
1.2 itojun 1021: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1022: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1.63 itojun 1023: sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6);
1.2 itojun 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,
1.63 itojun 1047: sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6);
1.2 itojun 1048: if (*mp)
1049: mp = &(*mp)->m_next;
1050: }
1051: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1052: int hlim = ip6->ip6_hlim & 0xff;
1.63 itojun 1053: *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1054: IPV6_HOPLIMIT, IPPROTO_IPV6);
1.2 itojun 1055: if (*mp)
1056: mp = &(*mp)->m_next;
1057: }
1058: /* IN6P_NEXTHOP - for outgoing packet only */
1059:
1060: /*
1061: * IPV6_HOPOPTS socket option. We require super-user privilege
1062: * for the option, but it might be too strict, since there might
1063: * be some hop-by-hop options which can be returned to normal user.
1064: * See RFC 2292 section 6.
1065: */
1.35 itojun 1066: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1067: /*
1068: * Check if a hop-by-hop options header is contatined in the
1069: * received packet, and if so, store the options as ancillary
1070: * data. Note that a hop-by-hop options header must be
1071: * just after the IPv6 header, which fact is assured through
1072: * the IPv6 input processing.
1073: */
1074: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1075: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1076: struct ip6_hbh *hbh;
1077: int hbhlen;
1.62 itojun 1078: struct mbuf *ext;
1.9 itojun 1079:
1.62 itojun 1080: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1081: ip6->ip6_nxt);
1082: if (ext == NULL) {
1.9 itojun 1083: ip6stat.ip6s_tooshort++;
1084: return;
1085: }
1.62 itojun 1086: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1087: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1088: if (hbhlen != ext->m_len) {
1089: m_freem(ext);
1.9 itojun 1090: ip6stat.ip6s_tooshort++;
1091: return;
1092: }
1.2 itojun 1093:
1094: /*
1095: * XXX: We copy whole the header even if a jumbo
1096: * payload option is included, which option is to
1097: * be removed before returning in the RFC 2292.
1098: * But it's too painful operation...
1099: */
1.9 itojun 1100: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.63 itojun 1101: IPV6_HOPOPTS, IPPROTO_IPV6);
1.2 itojun 1102: if (*mp)
1103: mp = &(*mp)->m_next;
1.62 itojun 1104: m_freem(ext);
1.2 itojun 1105: }
1106: }
1107:
1108: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1109: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1110: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60 simonb 1111: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1112:
1113: /*
1114: * Search for destination options headers or routing
1115: * header(s) through the header chain, and stores each
1116: * header as ancillary data.
1117: * Note that the order of the headers remains in
1118: * the chain of ancillary data.
1119: */
1.35 itojun 1120: while (1) { /* is explicit loop prevention necessary? */
1.62 itojun 1121: struct ip6_ext *ip6e = NULL;
1.9 itojun 1122: int elen;
1.62 itojun 1123: struct mbuf *ext = NULL;
1.9 itojun 1124:
1.62 itojun 1125: /*
1126: * if it is not an extension header, don't try to
1127: * pull it from the chain.
1128: */
1129: switch (nxt) {
1130: case IPPROTO_DSTOPTS:
1131: case IPPROTO_ROUTING:
1132: case IPPROTO_HOPOPTS:
1133: case IPPROTO_AH: /* is it possible? */
1134: break;
1135: default:
1136: goto loopend;
1137: }
1138:
1139: ext = ip6_pullexthdr(m, off, nxt);
1140: if (ext == NULL) {
1.9 itojun 1141: ip6stat.ip6s_tooshort++;
1142: return;
1143: }
1.62 itojun 1144: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1145: if (nxt == IPPROTO_AH)
1146: elen = (ip6e->ip6e_len + 2) << 2;
1147: else
1148: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1149: if (elen != ext->m_len) {
1150: m_freem(ext);
1.9 itojun 1151: ip6stat.ip6s_tooshort++;
1152: return;
1153: }
1.57 thorpej 1154: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1155:
1.35 itojun 1156: switch (nxt) {
1.62 itojun 1157: case IPPROTO_DSTOPTS:
1.35 itojun 1158: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1159: break;
1160:
1161: /*
1162: * We also require super-user privilege for
1163: * the option.
1164: * See the comments on IN6_HOPOPTS.
1165: */
1166: if (!privileged)
1167: break;
1168:
1169: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1170: IPV6_DSTOPTS, IPPROTO_IPV6);
1.35 itojun 1171: if (*mp)
1172: mp = &(*mp)->m_next;
1173: break;
1174:
1175: case IPPROTO_ROUTING:
1176: if (!in6p->in6p_flags & IN6P_RTHDR)
1177: break;
1178:
1179: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63 itojun 1180: IPV6_RTHDR, IPPROTO_IPV6);
1.35 itojun 1181: if (*mp)
1182: mp = &(*mp)->m_next;
1183: break;
1184:
1.62 itojun 1185: case IPPROTO_HOPOPTS:
1186: case IPPROTO_AH: /* is it possible? */
1187: break;
1188:
1.35 itojun 1189: default:
1190: /*
1.62 itojun 1191: * other cases have been filtered in the above.
1192: * none will visit this case. here we supply
1193: * the code just in case (nxt overwritten or
1194: * other cases).
1.35 itojun 1195: */
1.62 itojun 1196: m_freem(ext);
1.35 itojun 1197: goto loopend;
1198:
1.2 itojun 1199: }
1200:
1201: /* proceed with the next header. */
1.9 itojun 1202: off += elen;
1.2 itojun 1203: nxt = ip6e->ip6e_nxt;
1.62 itojun 1204: ip6e = NULL;
1205: m_freem(ext);
1206: ext = NULL;
1.2 itojun 1207: }
1208: loopend:
1.62 itojun 1209: ;
1.2 itojun 1210: }
1.62 itojun 1211: }
1212:
1213: /*
1214: * pull single extension header from mbuf chain. returns single mbuf that
1215: * contains the result, or NULL on error.
1216: */
1217: static struct mbuf *
1218: ip6_pullexthdr(m, off, nxt)
1219: struct mbuf *m;
1220: size_t off;
1221: int nxt;
1222: {
1223: struct ip6_ext ip6e;
1224: size_t elen;
1225: struct mbuf *n;
1226:
1227: #ifdef DIAGNOSTIC
1228: switch (nxt) {
1229: case IPPROTO_DSTOPTS:
1230: case IPPROTO_ROUTING:
1231: case IPPROTO_HOPOPTS:
1232: case IPPROTO_AH: /* is it possible? */
1233: break;
1234: default:
1235: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1236: }
1.62 itojun 1237: #endif
1.2 itojun 1238:
1.62 itojun 1239: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1240: if (nxt == IPPROTO_AH)
1241: elen = (ip6e.ip6e_len + 2) << 2;
1242: else
1243: elen = (ip6e.ip6e_len + 1) << 3;
1244:
1245: MGET(n, M_DONTWAIT, MT_DATA);
1246: if (n && elen >= MLEN) {
1247: MCLGET(n, M_DONTWAIT);
1248: if ((n->m_flags & M_EXT) == 0) {
1249: m_free(n);
1250: n = NULL;
1251: }
1252: }
1253: if (!n)
1254: return NULL;
1255:
1256: n->m_len = 0;
1257: if (elen >= M_TRAILINGSPACE(n)) {
1258: m_free(n);
1259: return NULL;
1260: }
1261:
1262: m_copydata(m, off, elen, mtod(n, caddr_t));
1263: n->m_len = elen;
1264: return n;
1.2 itojun 1265: }
1266:
1267: /*
1268: * Get pointer to the previous header followed by the header
1269: * currently processed.
1270: * XXX: This function supposes that
1271: * M includes all headers,
1272: * the next header field and the header length field of each header
1273: * are valid, and
1274: * the sum of each header length equals to OFF.
1275: * Because of these assumptions, this function must be called very
1276: * carefully. Moreover, it will not be used in the near future when
1277: * we develop `neater' mechanism to process extension headers.
1278: */
1.58 itojun 1279: u_int8_t *
1.2 itojun 1280: ip6_get_prevhdr(m, off)
1281: struct mbuf *m;
1282: int off;
1283: {
1284: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1285:
1286: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1287: return (&ip6->ip6_nxt);
1.2 itojun 1288: else {
1289: int len, nxt;
1290: struct ip6_ext *ip6e = NULL;
1291:
1292: nxt = ip6->ip6_nxt;
1293: len = sizeof(struct ip6_hdr);
1294: while (len < off) {
1295: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1296:
1.35 itojun 1297: switch (nxt) {
1.2 itojun 1298: case IPPROTO_FRAGMENT:
1299: len += sizeof(struct ip6_frag);
1300: break;
1301: case IPPROTO_AH:
1302: len += (ip6e->ip6e_len + 2) << 2;
1303: break;
1304: default:
1305: len += (ip6e->ip6e_len + 1) << 3;
1306: break;
1307: }
1308: nxt = ip6e->ip6e_nxt;
1309: }
1310: if (ip6e)
1.58 itojun 1311: return (&ip6e->ip6e_nxt);
1.2 itojun 1312: else
1313: return NULL;
1.18 itojun 1314: }
1315: }
1316:
1317: /*
1318: * get next header offset. m will be retained.
1319: */
1320: int
1321: ip6_nexthdr(m, off, proto, nxtp)
1322: struct mbuf *m;
1323: int off;
1324: int proto;
1325: int *nxtp;
1326: {
1327: struct ip6_hdr ip6;
1328: struct ip6_ext ip6e;
1329: struct ip6_frag fh;
1330:
1331: /* just in case */
1332: if (m == NULL)
1333: panic("ip6_nexthdr: m == NULL");
1334: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1335: return -1;
1336:
1337: switch (proto) {
1338: case IPPROTO_IPV6:
1339: if (m->m_pkthdr.len < off + sizeof(ip6))
1340: return -1;
1341: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1342: if (nxtp)
1343: *nxtp = ip6.ip6_nxt;
1344: off += sizeof(ip6);
1345: return off;
1346:
1347: case IPPROTO_FRAGMENT:
1348: /*
1349: * terminate parsing if it is not the first fragment,
1350: * it does not make sense to parse through it.
1351: */
1352: if (m->m_pkthdr.len < off + sizeof(fh))
1353: return -1;
1354: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1355: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1356: return -1;
1357: if (nxtp)
1358: *nxtp = fh.ip6f_nxt;
1359: off += sizeof(struct ip6_frag);
1360: return off;
1361:
1362: case IPPROTO_AH:
1363: if (m->m_pkthdr.len < off + sizeof(ip6e))
1364: return -1;
1365: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1366: if (nxtp)
1367: *nxtp = ip6e.ip6e_nxt;
1368: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1369: if (m->m_pkthdr.len < off)
1370: return -1;
1.18 itojun 1371: return off;
1372:
1373: case IPPROTO_HOPOPTS:
1374: case IPPROTO_ROUTING:
1375: case IPPROTO_DSTOPTS:
1376: if (m->m_pkthdr.len < off + sizeof(ip6e))
1377: return -1;
1378: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1379: if (nxtp)
1380: *nxtp = ip6e.ip6e_nxt;
1381: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1382: if (m->m_pkthdr.len < off)
1383: return -1;
1.18 itojun 1384: return off;
1385:
1386: case IPPROTO_NONE:
1387: case IPPROTO_ESP:
1388: case IPPROTO_IPCOMP:
1389: /* give up */
1390: return -1;
1391:
1392: default:
1393: return -1;
1394: }
1395: }
1396:
1397: /*
1398: * get offset for the last header in the chain. m will be kept untainted.
1399: */
1400: int
1401: ip6_lasthdr(m, off, proto, nxtp)
1402: struct mbuf *m;
1403: int off;
1404: int proto;
1405: int *nxtp;
1406: {
1407: int newoff;
1408: int nxt;
1409:
1410: if (!nxtp) {
1411: nxt = -1;
1412: nxtp = &nxt;
1413: }
1414: while (1) {
1415: newoff = ip6_nexthdr(m, off, proto, nxtp);
1416: if (newoff < 0)
1417: return off;
1418: else if (newoff < off)
1419: return -1; /* invalid */
1420: else if (newoff == off)
1421: return newoff;
1422:
1423: off = newoff;
1424: proto = *nxtp;
1.2 itojun 1425: }
1426: }
1427:
1428: /*
1429: * System control for IP6
1430: */
1431:
1432: u_char inet6ctlerrmap[PRC_NCMDS] = {
1433: 0, 0, 0, 0,
1434: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1435: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1436: EMSGSIZE, EHOSTUNREACH, 0, 0,
1437: 0, 0, 0, 0,
1438: ENOPROTOOPT
1439: };
1440:
1441: int
1442: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1443: int *name;
1444: u_int namelen;
1445: void *oldp;
1446: size_t *oldlenp;
1447: void *newp;
1448: size_t newlen;
1449: {
1.26 itojun 1450: int old, error;
1451:
1.2 itojun 1452: /* All sysctl names at this level are terminal. */
1453: if (namelen != 1)
1454: return ENOTDIR;
1455:
1456: switch (name[0]) {
1457:
1458: case IPV6CTL_FORWARDING:
1459: return sysctl_int(oldp, oldlenp, newp, newlen,
1460: &ip6_forwarding);
1461: case IPV6CTL_SENDREDIRECTS:
1462: return sysctl_int(oldp, oldlenp, newp, newlen,
1463: &ip6_sendredirects);
1464: case IPV6CTL_DEFHLIM:
1465: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1466: case IPV6CTL_MAXFRAGPACKETS:
1467: return sysctl_int(oldp, oldlenp, newp, newlen,
1468: &ip6_maxfragpackets);
1469: case IPV6CTL_ACCEPT_RTADV:
1470: return sysctl_int(oldp, oldlenp, newp, newlen,
1471: &ip6_accept_rtadv);
1472: case IPV6CTL_KEEPFAITH:
1473: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1474: case IPV6CTL_LOG_INTERVAL:
1475: return sysctl_int(oldp, oldlenp, newp, newlen,
1476: &ip6_log_interval);
1477: case IPV6CTL_HDRNESTLIMIT:
1478: return sysctl_int(oldp, oldlenp, newp, newlen,
1479: &ip6_hdrnestlimit);
1480: case IPV6CTL_DAD_COUNT:
1481: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1482: case IPV6CTL_AUTO_FLOWLABEL:
1483: return sysctl_int(oldp, oldlenp, newp, newlen,
1484: &ip6_auto_flowlabel);
1485: case IPV6CTL_DEFMCASTHLIM:
1486: return sysctl_int(oldp, oldlenp, newp, newlen,
1487: &ip6_defmcasthlim);
1.51 itojun 1488: #if NGIF > 0
1.2 itojun 1489: case IPV6CTL_GIF_HLIM:
1490: return sysctl_int(oldp, oldlenp, newp, newlen,
1491: &ip6_gif_hlim);
1.51 itojun 1492: #endif
1.2 itojun 1493: case IPV6CTL_KAME_VERSION:
1494: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1495: case IPV6CTL_USE_DEPRECATED:
1496: return sysctl_int(oldp, oldlenp, newp, newlen,
1497: &ip6_use_deprecated);
1.10 itojun 1498: case IPV6CTL_RR_PRUNE:
1499: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1500: case IPV6CTL_V6ONLY:
1501: #ifdef INET6_BINDV6ONLY
1502: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1503: #else
1504: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1505: #endif
1506: case IPV6CTL_ANONPORTMIN:
1507: old = ip6_anonportmin;
1508: error = sysctl_int(oldp, oldlenp, newp, newlen,
1509: &ip6_anonportmin);
1510: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1511: ip6_anonportmin > 65535
1512: #ifndef IPNOPRIVPORTS
1513: || ip6_anonportmin < IPV6PORT_RESERVED
1514: #endif
1515: ) {
1516: ip6_anonportmin = old;
1517: return (EINVAL);
1518: }
1519: return (error);
1520: case IPV6CTL_ANONPORTMAX:
1521: old = ip6_anonportmax;
1522: error = sysctl_int(oldp, oldlenp, newp, newlen,
1523: &ip6_anonportmax);
1524: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1525: ip6_anonportmax > 65535
1526: #ifndef IPNOPRIVPORTS
1527: || ip6_anonportmax < IPV6PORT_RESERVED
1528: #endif
1529: ) {
1530: ip6_anonportmax = old;
1531: return (EINVAL);
1532: }
1533: return (error);
1534: #ifndef IPNOPRIVPORTS
1535: case IPV6CTL_LOWPORTMIN:
1536: old = ip6_lowportmin;
1537: error = sysctl_int(oldp, oldlenp, newp, newlen,
1538: &ip6_lowportmin);
1539: if (ip6_lowportmin >= ip6_lowportmax ||
1540: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1541: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1542: ip6_lowportmin = old;
1543: return (EINVAL);
1544: }
1545: return (error);
1546: case IPV6CTL_LOWPORTMAX:
1547: old = ip6_lowportmax;
1548: error = sysctl_int(oldp, oldlenp, newp, newlen,
1549: &ip6_lowportmax);
1550: if (ip6_lowportmin >= ip6_lowportmax ||
1551: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1552: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1553: ip6_lowportmax = old;
1554: return (EINVAL);
1555: }
1556: return (error);
1.11 itojun 1557: #endif
1.53 itojun 1558: case IPV6CTL_MAXFRAGS:
1559: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2 itojun 1560: default:
1561: return EOPNOTSUPP;
1562: }
1563: /* NOTREACHED */
1564: }
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