Annotation of src/sys/netinet6/ip6_input.c, Revision 1.128
1.128 ! pooka 1: /* $NetBSD: ip6_input.c,v 1.127 2009/05/01 03:23:39 martin 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>
1.128 ! pooka 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.127 2009/05/01 03:23:39 martin Exp $");
1.2 itojun 66:
67: #include "opt_inet.h"
1.85 rpaulo 68: #include "opt_inet6.h"
1.4 thorpej 69: #include "opt_ipsec.h"
1.15 darrenr 70: #include "opt_pfil_hooks.h"
1.123 christos 71: #include "opt_compat_netbsd.h"
1.2 itojun 72:
73: #include <sys/param.h>
74: #include <sys/systm.h>
75: #include <sys/malloc.h>
76: #include <sys/mbuf.h>
77: #include <sys/domain.h>
78: #include <sys/protosw.h>
79: #include <sys/socket.h>
80: #include <sys/socketvar.h>
81: #include <sys/errno.h>
82: #include <sys/time.h>
83: #include <sys/kernel.h>
84: #include <sys/syslog.h>
85: #include <sys/proc.h>
1.46 simonb 86: #include <sys/sysctl.h>
1.2 itojun 87:
88: #include <net/if.h>
89: #include <net/if_types.h>
90: #include <net/if_dl.h>
91: #include <net/route.h>
92: #include <net/netisr.h>
1.15 darrenr 93: #ifdef PFIL_HOOKS
94: #include <net/pfil.h>
95: #endif
1.2 itojun 96:
97: #include <netinet/in.h>
1.9 itojun 98: #include <netinet/in_systm.h>
99: #ifdef INET
100: #include <netinet/ip.h>
101: #include <netinet/ip_icmp.h>
1.45 itojun 102: #endif /* INET */
1.14 itojun 103: #include <netinet/ip6.h>
1.2 itojun 104: #include <netinet6/in6_var.h>
1.11 itojun 105: #include <netinet6/ip6_var.h>
1.116 thorpej 106: #include <netinet6/ip6_private.h>
1.2 itojun 107: #include <netinet6/in6_pcb.h>
1.14 itojun 108: #include <netinet/icmp6.h>
1.81 rpaulo 109: #include <netinet6/scope6_var.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>
1.117 thorpej 115: #include <netinet6/ipsec_private.h>
1.37 itojun 116: #endif
117:
1.94 degroote 118: #ifdef FAST_IPSEC
119: #include <netipsec/ipsec.h>
120: #include <netipsec/ipsec6.h>
121: #include <netipsec/key.h>
122: #endif /* FAST_IPSEC */
123:
1.123 christos 124: #ifdef COMPAT_50
125: #include <compat/sys/time.h>
126: #include <compat/sys/socket.h>
127: #endif
128:
1.2 itojun 129: #include <netinet6/ip6protosw.h>
130:
131: #include "faith.h"
132: #include "gif.h"
1.50 itojun 133:
134: #if NGIF > 0
135: #include <netinet6/in6_gif.h>
136: #endif
1.2 itojun 137:
1.9 itojun 138: #include <net/net_osdep.h>
139:
1.2 itojun 140: extern struct domain inet6domain;
141:
142: u_char ip6_protox[IPPROTO_MAX];
143: static int ip6qmaxlen = IFQ_MAXLEN;
144: struct in6_ifaddr *in6_ifaddr;
145: struct ifqueue ip6intrq;
146:
1.108 ad 147: extern callout_t in6_tmpaddrtimer_ch;
1.83 rpaulo 148:
1.2 itojun 149: int ip6_forward_srcrt; /* XXX */
150: int ip6_sourcecheck; /* XXX */
151: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 152:
1.29 thorpej 153: #ifdef PFIL_HOOKS
154: struct pfil_head inet6_pfil_hook;
155: #endif
156:
1.116 thorpej 157: percpu_t *ip6stat_percpu;
1.2 itojun 158:
1.111 dyoung 159: static void ip6_init2(void *);
1.112 dyoung 160: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2 itojun 161:
1.111 dyoung 162: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
163: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128 ! pooka 164: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2 itojun 165:
166: /*
167: * IP6 initialization: fill in IP6 protocol switch table.
168: * All protocols not implemented in kernel go to raw IP6 protocol handler.
169: */
170: void
1.114 matt 171: ip6_init(void)
1.2 itojun 172: {
1.78 christos 173: const struct ip6protosw *pr;
1.35 itojun 174: int i;
1.2 itojun 175:
1.128 ! pooka 176: sysctl_net_inet6_ip6_setup(NULL);
1.78 christos 177: pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2 itojun 178: if (pr == 0)
179: panic("ip6_init");
180: for (i = 0; i < IPPROTO_MAX; i++)
181: ip6_protox[i] = pr - inet6sw;
1.78 christos 182: for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
183: pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2 itojun 184: if (pr->pr_domain->dom_family == PF_INET6 &&
185: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
186: ip6_protox[pr->pr_protocol] = pr - inet6sw;
187: ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81 rpaulo 188: scope6_init();
189: addrsel_policy_init();
1.2 itojun 190: nd6_init();
191: frag6_init();
1.83 rpaulo 192: ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2 itojun 193:
194: ip6_init2((void *)0);
1.98 liamjfoy 195: #ifdef GATEWAY
1.99 liamjfoy 196: ip6flow_init(ip6_hashsize);
1.98 liamjfoy 197: #endif
1.29 thorpej 198:
199: #ifdef PFIL_HOOKS
200: /* Register our Packet Filter hook. */
1.33 thorpej 201: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
202: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 203: i = pfil_head_register(&inet6_pfil_hook);
204: if (i != 0)
205: printf("ip6_init: WARNING: unable to register pfil hook, "
206: "error %d\n", i);
207: #endif /* PFIL_HOOKS */
1.116 thorpej 208:
209: ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2 itojun 210: }
211:
212: static void
1.90 christos 213: ip6_init2(void *dummy)
1.2 itojun 214: {
215:
216: /* nd6_timer_init */
1.118 ad 217: callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19 thorpej 218: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83 rpaulo 219:
220: /* timer for regeneranation of temporary addresses randomize ID */
1.118 ad 221: callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83 rpaulo 222: callout_reset(&in6_tmpaddrtimer_ch,
223: (ip6_temp_preferred_lifetime - ip6_desync_factor -
224: ip6_temp_regen_advance) * hz,
225: in6_tmpaddrtimer, NULL);
1.2 itojun 226: }
227:
228: /*
229: * IP6 input interrupt handling. Just pass the packet to ip6_input.
230: */
231: void
1.114 matt 232: ip6intr(void)
1.2 itojun 233: {
234: int s;
235: struct mbuf *m;
236:
1.118 ad 237: mutex_enter(softnet_lock);
238: KERNEL_LOCK(1, NULL);
1.2 itojun 239: for (;;) {
1.41 thorpej 240: s = splnet();
1.2 itojun 241: IF_DEQUEUE(&ip6intrq, m);
242: splx(s);
243: if (m == 0)
1.118 ad 244: break;
1.83 rpaulo 245: /* drop the packet if IPv6 operation is disabled on the IF */
246: if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
247: m_freem(m);
1.118 ad 248: break;
1.83 rpaulo 249: }
1.2 itojun 250: ip6_input(m);
251: }
1.118 ad 252: KERNEL_UNLOCK_ONE(NULL);
253: mutex_exit(softnet_lock);
1.2 itojun 254: }
255:
1.103 dyoung 256: extern struct route ip6_forward_rt;
1.2 itojun 257:
258: void
1.96 dyoung 259: ip6_input(struct mbuf *m)
1.2 itojun 260: {
1.9 itojun 261: struct ip6_hdr *ip6;
1.105 dyoung 262: int hit, off = sizeof(struct ip6_hdr), nest;
1.2 itojun 263: u_int32_t plen;
1.5 itojun 264: u_int32_t rtalert = ~0;
1.104 yamt 265: int nxt, ours = 0, rh_present = 0;
1.9 itojun 266: struct ifnet *deliverifp = NULL;
1.64 itojun 267: int srcrt = 0;
1.105 dyoung 268: const struct rtentry *rt;
269: union {
270: struct sockaddr dst;
271: struct sockaddr_in6 dst6;
272: } u;
1.94 degroote 273: #ifdef FAST_IPSEC
274: struct m_tag *mtag;
275: struct tdb_ident *tdbi;
276: struct secpolicy *sp;
277: int s, error;
278: #endif
1.2 itojun 279:
280: #ifdef IPSEC
281: /*
282: * should the inner packet be considered authentic?
283: * see comment in ah4_input().
284: */
1.49 itojun 285: m->m_flags &= ~M_AUTHIPHDR;
286: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 287: #endif
1.9 itojun 288:
1.2 itojun 289: /*
1.81 rpaulo 290: * make sure we don't have onion peering information into m_tag.
291: */
292: ip6_delaux(m);
293:
294: /*
1.44 itojun 295: * mbuf statistics
1.2 itojun 296: */
297: if (m->m_flags & M_EXT) {
298: if (m->m_next)
1.116 thorpej 299: IP6_STATINC(IP6_STAT_MEXT2M);
1.2 itojun 300: else
1.116 thorpej 301: IP6_STATINC(IP6_STAT_MEXT1);
1.2 itojun 302: } else {
1.115 thorpej 303: #define M2MMAX 32
1.2 itojun 304: if (m->m_next) {
1.9 itojun 305: if (m->m_flags & M_LOOP) {
1.116 thorpej 306: /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115 thorpej 307: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116 thorpej 308: IP6_STATINC(IP6_STAT_M2M +
309: m->m_pkthdr.rcvif->if_index);
1.115 thorpej 310: } else
1.116 thorpej 311: IP6_STATINC(IP6_STAT_M2M);
1.2 itojun 312: } else
1.116 thorpej 313: IP6_STATINC(IP6_STAT_M1);
1.40 itojun 314: #undef M2MMAX
1.2 itojun 315: }
316:
1.9 itojun 317: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116 thorpej 318: IP6_STATINC(IP6_STAT_TOTAL);
1.9 itojun 319:
1.57 thorpej 320: /*
321: * If the IPv6 header is not aligned, slurp it up into a new
322: * mbuf with space for link headers, in the event we forward
1.81 rpaulo 323: * it. Otherwise, if it is aligned, make sure the entire base
1.57 thorpej 324: * IPv6 header is in the first mbuf of the chain.
325: */
1.97 christos 326: if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57 thorpej 327: struct ifnet *inifp = m->m_pkthdr.rcvif;
328: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
329: (max_linkhdr + 3) & ~3)) == NULL) {
330: /* XXXJRT new stat, please */
1.116 thorpej 331: IP6_STATINC(IP6_STAT_TOOSMALL);
1.57 thorpej 332: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
333: return;
334: }
335: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
336: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 337: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116 thorpej 338: IP6_STATINC(IP6_STAT_TOOSMALL);
1.9 itojun 339: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
340: return;
341: }
1.2 itojun 342: }
343:
344: ip6 = mtod(m, struct ip6_hdr *);
345:
346: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116 thorpej 347: IP6_STATINC(IP6_STAT_BADVERS);
1.9 itojun 348: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 349: goto bad;
350: }
1.15 darrenr 351:
1.98 liamjfoy 352: #if defined(IPSEC)
353: /* IPv6 fast forwarding is not compatible with IPsec. */
354: m->m_flags &= ~M_CANFASTFWD;
355: #else
356: /*
357: * Assume that we can create a fast-forward IP flow entry
358: * based on this packet.
359: */
360: m->m_flags |= M_CANFASTFWD;
361: #endif
362:
1.15 darrenr 363: #ifdef PFIL_HOOKS
364: /*
365: * Run through list of hooks for input packets. If there are any
366: * filters which require that additional packets in the flow are
367: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
368: * Note that filters must _never_ set this flag, as another filter
369: * in the list may have previously cleared it.
370: */
1.39 itojun 371: /*
372: * let ipfilter look at packet on the wire,
373: * not the decapsulated packet.
374: */
375: #ifdef IPSEC
1.42 itojun 376: if (!ipsec_getnhist(m))
1.94 degroote 377: #elif defined(FAST_IPSEC)
378: if (!ipsec_indone(m))
1.39 itojun 379: #else
380: if (1)
381: #endif
382: {
1.64 itojun 383: struct in6_addr odst;
384:
385: odst = ip6->ip6_dst;
1.39 itojun 386: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
387: PFIL_IN) != 0)
388: return;
389: if (m == NULL)
390: return;
391: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 392: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 393: }
1.15 darrenr 394: #endif /* PFIL_HOOKS */
395:
1.116 thorpej 396: IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2 itojun 397:
1.30 thorpej 398: #ifdef ALTQ
399: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
400: /* packet is dropped by traffic conditioner */
401: return;
1.9 itojun 402: }
403: #endif
404:
1.2 itojun 405: /*
1.44 itojun 406: * Check against address spoofing/corruption.
1.2 itojun 407: */
408: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
409: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 410: /*
411: * XXX: "badscope" is not very suitable for a multicast source.
412: */
1.116 thorpej 413: IP6_STATINC(IP6_STAT_BADSCOPE);
1.9 itojun 414: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 415: goto bad;
416: }
1.13 itojun 417: /*
1.44 itojun 418: * The following check is not documented in specs. A malicious
419: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
420: * and bypass security checks (act as if it was from 127.0.0.1 by using
421: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 422: *
1.44 itojun 423: * This check chokes if we are in an SIIT cloud. As none of BSDs
424: * support IPv4-less kernel compilation, we cannot support SIIT
425: * environment at all. So, it makes more sense for us to reject any
426: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 427: * partial support for SIIT environment.
1.13 itojun 428: */
429: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
430: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 431: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 432: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
433: goto bad;
434: }
1.17 itojun 435: #if 0
1.13 itojun 436: /*
1.17 itojun 437: * Reject packets with IPv4 compatible addresses (auto tunnel).
438: *
439: * The code forbids auto tunnel relay case in RFC1933 (the check is
440: * stronger than RFC1933). We may want to re-enable it if mech-xx
441: * is revised to forbid relaying case.
1.13 itojun 442: */
443: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
444: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116 thorpej 445: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 446: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
447: goto bad;
448: }
449: #endif
1.35 itojun 450:
1.2 itojun 451: /*
1.82 yamt 452: * Disambiguate address scope zones (if there is ambiguity).
453: * We first make sure that the original source or destination address
454: * is not in our internal form for scoped addresses. Such addresses
455: * are not necessarily invalid spec-wise, but we cannot accept them due
456: * to the usage conflict.
457: * in6_setscope() then also checks and rejects the cases where src or
458: * dst are the loopback address and the receiving interface
459: * is not loopback.
460: */
1.88 bouyer 461: if (__predict_false(
462: m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
463: goto bad;
464: ip6 = mtod(m, struct ip6_hdr *);
1.82 yamt 465: if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116 thorpej 466: IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82 yamt 467: goto bad;
468: }
469: if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
470: in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116 thorpej 471: IP6_STATINC(IP6_STAT_BADSCOPE);
1.82 yamt 472: goto bad;
473: }
474:
475: /*
1.2 itojun 476: * Multicast check
477: */
478: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
479: struct in6_multi *in6m = 0;
1.9 itojun 480:
481: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 482: /*
483: * See if we belong to the destination multicast group on the
484: * arrival interface.
485: */
486: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
487: if (in6m)
488: ours = 1;
489: else if (!ip6_mrouter) {
1.116 thorpej 490: uint64_t *ip6s = IP6_STAT_GETREF();
491: ip6s[IP6_STAT_NOTMEMBER]++;
492: ip6s[IP6_STAT_CANTFORWARD]++;
493: IP6_STAT_PUTREF();
1.9 itojun 494: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 495: goto bad;
496: }
1.9 itojun 497: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 498: goto hbhcheck;
499: }
500:
1.105 dyoung 501: sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
502:
1.2 itojun 503: /*
504: * Unicast check
505: */
1.105 dyoung 506: rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
507: if (hit)
1.116 thorpej 508: IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93 joerg 509: else
1.116 thorpej 510: IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22 itojun 511:
1.109 dyoung 512: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2 itojun 513:
514: /*
515: * Accept the packet if the forwarding interface to the destination
516: * according to the routing table is the loopback interface,
517: * unless the associated route has a gateway.
518: * Note that this approach causes to accept a packet if there is a
519: * route to the loopback interface for the destination of the packet.
520: * But we think it's even useful in some situations, e.g. when using
521: * a special daemon which wants to intercept the packet.
522: */
1.105 dyoung 523: if (rt != NULL &&
524: (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
525: !(rt->rt_flags & RTF_CLONED) &&
1.2 itojun 526: #if 0
527: /*
528: * The check below is redundant since the comparison of
529: * the destination and the key of the rtentry has
530: * already done through looking up the routing table.
531: */
1.109 dyoung 532: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2 itojun 533: #endif
1.105 dyoung 534: rt->rt_ifp->if_type == IFT_LOOP) {
535: struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2 itojun 536: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
537: m->m_flags |= M_ANYCAST6;
1.24 itojun 538: /*
539: * packets to a tentative, duplicated, or somehow invalid
540: * address must not be accepted.
541: */
1.2 itojun 542: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 543: /* this address is ready */
1.2 itojun 544: ours = 1;
1.9 itojun 545: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 546: goto hbhcheck;
547: } else {
1.24 itojun 548: /* address is not ready, so discard the packet. */
1.34 itojun 549: nd6log((LOG_INFO,
1.27 itojun 550: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 551: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 552: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 553:
554: goto bad;
1.2 itojun 555: }
556: }
557:
558: /*
1.55 itojun 559: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 560: */
561: #if defined(NFAITH) && 0 < NFAITH
562: if (ip6_keepfaith) {
1.105 dyoung 563: if (rt != NULL && rt->rt_ifp != NULL &&
564: rt->rt_ifp->if_type == IFT_FAITH) {
1.2 itojun 565: /* XXX do we need more sanity checks? */
566: ours = 1;
1.105 dyoung 567: deliverifp = rt->rt_ifp; /* faith */
1.9 itojun 568: goto hbhcheck;
569: }
570: }
571: #endif
572:
573: #if 0
574: {
575: /*
576: * Last resort: check in6_ifaddr for incoming interface.
577: * The code is here until I update the "goto ours hack" code above
578: * working right.
579: */
580: struct ifaddr *ifa;
1.113 dyoung 581: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9 itojun 582: if (ifa->ifa_addr == NULL)
583: continue; /* just for safety */
584: if (ifa->ifa_addr->sa_family != AF_INET6)
585: continue;
586: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
587: ours = 1;
588: deliverifp = ifa->ifa_ifp;
1.2 itojun 589: goto hbhcheck;
590: }
591: }
1.9 itojun 592: }
1.2 itojun 593: #endif
594:
595: /*
596: * Now there is no reason to process the packet if it's not our own
597: * and we're not a router.
598: */
599: if (!ip6_forwarding) {
1.116 thorpej 600: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9 itojun 601: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 602: goto bad;
603: }
604:
605: hbhcheck:
606: /*
1.81 rpaulo 607: * record address information into m_tag, if we don't have one yet.
608: * note that we are unable to record it, if the address is not listed
609: * as our interface address (e.g. multicast addresses, addresses
610: * within FAITH prefixes and such).
611: */
1.111 dyoung 612: if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81 rpaulo 613: struct in6_ifaddr *ia6;
614:
615: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111 dyoung 616: if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
617: /*
618: * XXX maybe we should drop the packet here,
619: * as we could not provide enough information
620: * to the upper layers.
621: */
1.81 rpaulo 622: }
623: }
624:
625: /*
1.2 itojun 626: * Process Hop-by-Hop options header if it's contained.
627: * m may be modified in ip6_hopopts_input().
628: * If a JumboPayload option is included, plen will also be modified.
629: */
630: plen = (u_int32_t)ntohs(ip6->ip6_plen);
631: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 632: struct ip6_hbh *hbh;
633:
634: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
635: #if 0 /*touches NULL pointer*/
636: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
637: #endif
1.2 itojun 638: return; /* m have already been freed */
1.9 itojun 639: }
1.22 itojun 640:
1.2 itojun 641: /* adjust pointer */
642: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 643:
644: /*
1.49 itojun 645: * if the payload length field is 0 and the next header field
1.22 itojun 646: * indicates Hop-by-Hop Options header, then a Jumbo Payload
647: * option MUST be included.
648: */
649: if (ip6->ip6_plen == 0 && plen == 0) {
650: /*
651: * Note that if a valid jumbo payload option is
1.83 rpaulo 652: * contained, ip6_hopopts_input() must set a valid
1.55 itojun 653: * (non-zero) payload length to the variable plen.
1.22 itojun 654: */
1.116 thorpej 655: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 656: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
657: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
658: icmp6_error(m, ICMP6_PARAM_PROB,
659: ICMP6_PARAMPROB_HEADER,
1.97 christos 660: (char *)&ip6->ip6_plen - (char *)ip6);
1.22 itojun 661: return;
662: }
1.9 itojun 663: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
664: sizeof(struct ip6_hbh));
665: if (hbh == NULL) {
1.116 thorpej 666: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 667: return;
668: }
1.57 thorpej 669: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 670: nxt = hbh->ip6h_nxt;
1.2 itojun 671:
672: /*
673: * accept the packet if a router alert option is included
674: * and we act as an IPv6 router.
675: */
1.5 itojun 676: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 677: ours = 1;
678: } else
679: nxt = ip6->ip6_nxt;
680:
681: /*
682: * Check that the amount of data in the buffers
683: * is as at least much as the IPv6 header would have us expect.
684: * Trim mbufs if longer than we expect.
685: * Drop packet if shorter than we expect.
686: */
687: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116 thorpej 688: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 689: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 690: goto bad;
691: }
692: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
693: if (m->m_len == m->m_pkthdr.len) {
694: m->m_len = sizeof(struct ip6_hdr) + plen;
695: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
696: } else
697: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
698: }
699:
700: /*
701: * Forward if desirable.
702: */
703: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
704: /*
705: * If we are acting as a multicast router, all
706: * incoming multicast packets are passed to the
707: * kernel-level multicast forwarding function.
708: * The packet is returned (relatively) intact; if
709: * ip6_mforward() returns a non-zero value, the packet
710: * must be discarded, else it may be accepted below.
711: */
712: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116 thorpej 713: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2 itojun 714: m_freem(m);
715: return;
716: }
717: if (!ours) {
718: m_freem(m);
719: return;
720: }
1.22 itojun 721: } else if (!ours) {
1.64 itojun 722: ip6_forward(m, srcrt);
1.2 itojun 723: return;
1.56 itojun 724: }
1.25 itojun 725:
726: ip6 = mtod(m, struct ip6_hdr *);
727:
728: /*
729: * Malicious party may be able to use IPv4 mapped addr to confuse
730: * tcp/udp stack and bypass security checks (act as if it was from
731: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
732: *
733: * For SIIT end node behavior, you may want to disable the check.
734: * However, you will become vulnerable to attacks using IPv4 mapped
735: * source.
736: */
737: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
738: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 739: IP6_STATINC(IP6_STAT_BADSCOPE);
1.25 itojun 740: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
741: goto bad;
742: }
1.2 itojun 743:
744: /*
745: * Tell launch routine the next header
746: */
1.12 itojun 747: #ifdef IFA_STATS
1.28 itojun 748: if (deliverifp != NULL) {
1.9 itojun 749: struct in6_ifaddr *ia6;
750: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
751: if (ia6)
752: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
753: }
754: #endif
1.116 thorpej 755: IP6_STATINC(IP6_STAT_DELIVERED);
1.9 itojun 756: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 757: nest = 0;
1.40 itojun 758:
1.104 yamt 759: rh_present = 0;
1.2 itojun 760: while (nxt != IPPROTO_DONE) {
761: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116 thorpej 762: IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104 yamt 763: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 764: goto bad;
765: }
1.8 itojun 766:
767: /*
768: * protection against faulty packet - there should be
769: * more sanity checks in header chain processing.
770: */
771: if (m->m_pkthdr.len < off) {
1.116 thorpej 772: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 773: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 774: goto bad;
775: }
776:
1.104 yamt 777: if (nxt == IPPROTO_ROUTING) {
778: if (rh_present++) {
779: in6_ifstat_inc(m->m_pkthdr.rcvif,
780: ifs6_in_hdrerr);
1.116 thorpej 781: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104 yamt 782: goto bad;
783: }
784: }
785:
1.37 itojun 786: #ifdef IPSEC
787: /*
788: * enforce IPsec policy checking if we are seeing last header.
789: * note that we do not visit this with protocols with pcb layer
790: * code - like udp/tcp/raw ip.
791: */
792: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
793: ipsec6_in_reject(m, NULL)) {
1.117 thorpej 794: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37 itojun 795: goto bad;
796: }
797: #endif
1.94 degroote 798: #ifdef FAST_IPSEC
799: /*
800: * enforce IPsec policy checking if we are seeing last header.
801: * note that we do not visit this with protocols with pcb layer
802: * code - like udp/tcp/raw ip.
803: */
804: if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
805: /*
806: * Check if the packet has already had IPsec processing
807: * done. If so, then just pass it along. This tag gets
808: * set during AH, ESP, etc. input handling, before the
809: * packet is returned to the ip input queue for delivery.
810: */
811: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
812: s = splsoftnet();
813: if (mtag != NULL) {
814: tdbi = (struct tdb_ident *)(mtag + 1);
815: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
816: } else {
817: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
818: IP_FORWARDING, &error);
819: }
820: if (sp != NULL) {
821: /*
822: * Check security policy against packet attributes.
823: */
824: error = ipsec_in_reject(sp, m);
825: KEY_FREESP(&sp);
826: } else {
827: /* XXX error stat??? */
828: error = EINVAL;
829: DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
830: }
831: splx(s);
832: if (error)
833: goto bad;
834: }
835: #endif /* FAST_IPSEC */
836:
1.56 itojun 837:
1.2 itojun 838: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
839: }
840: return;
841: bad:
842: m_freem(m);
843: }
844:
845: /*
1.81 rpaulo 846: * set/grab in6_ifaddr correspond to IPv6 destination address.
847: */
848: static struct m_tag *
1.112 dyoung 849: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81 rpaulo 850: {
851: struct m_tag *mtag;
852:
853: mtag = ip6_addaux(m);
1.112 dyoung 854: if (mtag != NULL) {
855: struct ip6aux *ip6a;
856:
857: ip6a = (struct ip6aux *)(mtag + 1);
858: in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
859: ip6a->ip6a_src = ia->ia_addr.sin6_addr;
860: ip6a->ip6a_flags = ia->ia6_flags;
861: }
1.81 rpaulo 862: return mtag; /* NULL if failed to set */
863: }
864:
1.112 dyoung 865: const struct ip6aux *
1.107 christos 866: ip6_getdstifaddr(struct mbuf *m)
1.81 rpaulo 867: {
868: struct m_tag *mtag;
869:
870: mtag = ip6_findaux(m);
1.112 dyoung 871: if (mtag != NULL)
872: return (struct ip6aux *)(mtag + 1);
1.81 rpaulo 873: else
874: return NULL;
875: }
876:
877: /*
1.2 itojun 878: * Hop-by-Hop options header processing. If a valid jumbo payload option is
879: * included, the real payload length will be stored in plenp.
1.107 christos 880: *
881: * rtalertp - XXX: should be stored more smart way
1.2 itojun 882: */
883: static int
1.107 christos 884: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
885: struct mbuf **mp, int *offp)
1.2 itojun 886: {
1.35 itojun 887: struct mbuf *m = *mp;
1.2 itojun 888: int off = *offp, hbhlen;
889: struct ip6_hbh *hbh;
890:
891: /* validation of the length of the header */
1.9 itojun 892: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
893: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
894: if (hbh == NULL) {
1.116 thorpej 895: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 896: return -1;
897: }
898: hbhlen = (hbh->ip6h_len + 1) << 3;
899: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
900: hbhlen);
901: if (hbh == NULL) {
1.116 thorpej 902: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 903: return -1;
904: }
1.57 thorpej 905: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 906: off += hbhlen;
907: hbhlen -= sizeof(struct ip6_hbh);
908:
909: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
910: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 911: return (-1);
1.2 itojun 912:
913: *offp = off;
914: *mp = m;
1.58 itojun 915: return (0);
1.2 itojun 916: }
917:
918: /*
919: * Search header for all Hop-by-hop options and process each option.
920: * This function is separate from ip6_hopopts_input() in order to
921: * handle a case where the sending node itself process its hop-by-hop
922: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 923: *
924: * The function assumes that hbh header is located right after the IPv6 header
925: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
926: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 927: */
928: int
1.107 christos 929: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
930: u_int32_t *rtalertp, u_int32_t *plenp)
1.2 itojun 931: {
932: struct ip6_hdr *ip6;
933: int optlen = 0;
934: u_int8_t *opt = opthead;
935: u_int16_t rtalert_val;
1.22 itojun 936: u_int32_t jumboplen;
1.55 itojun 937: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 938:
939: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 940: switch (*opt) {
941: case IP6OPT_PAD1:
942: optlen = 1;
943: break;
944: case IP6OPT_PADN:
945: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 946: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 947: goto bad;
948: }
949: optlen = *(opt + 1) + 2;
950: break;
951: case IP6OPT_RTALERT:
952: /* XXX may need check for alignment */
953: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116 thorpej 954: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 955: goto bad;
956: }
957: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 958: /* XXX stat */
959: icmp6_error(m, ICMP6_PARAM_PROB,
960: ICMP6_PARAMPROB_HEADER,
961: erroff + opt + 1 - opthead);
962: return (-1);
1.35 itojun 963: }
964: optlen = IP6OPT_RTALERT_LEN;
1.126 tsutsui 965: memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35 itojun 966: *rtalertp = ntohs(rtalert_val);
967: break;
968: case IP6OPT_JUMBO:
1.22 itojun 969: /* XXX may need check for alignment */
970: if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116 thorpej 971: IP6_STATINC(IP6_STAT_TOOSMALL);
1.22 itojun 972: goto bad;
973: }
1.35 itojun 974: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 975: /* XXX stat */
976: icmp6_error(m, ICMP6_PARAM_PROB,
977: ICMP6_PARAMPROB_HEADER,
978: erroff + opt + 1 - opthead);
979: return (-1);
1.35 itojun 980: }
1.22 itojun 981: optlen = IP6OPT_JUMBO_LEN;
982:
983: /*
984: * IPv6 packets that have non 0 payload length
1.35 itojun 985: * must not contain a jumbo payload option.
1.22 itojun 986: */
987: ip6 = mtod(m, struct ip6_hdr *);
988: if (ip6->ip6_plen) {
1.116 thorpej 989: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 990: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 991: ICMP6_PARAMPROB_HEADER,
992: erroff + opt - opthead);
993: return (-1);
1.22 itojun 994: }
1.2 itojun 995:
1.22 itojun 996: /*
997: * We may see jumbolen in unaligned location, so
998: * we'd need to perform bcopy().
999: */
1.126 tsutsui 1000: memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22 itojun 1001: jumboplen = (u_int32_t)htonl(jumboplen);
1002:
1003: #if 1
1004: /*
1005: * if there are multiple jumbo payload options,
1006: * *plenp will be non-zero and the packet will be
1007: * rejected.
1008: * the behavior may need some debate in ipngwg -
1009: * multiple options does not make sense, however,
1010: * there's no explicit mention in specification.
1011: */
1012: if (*plenp != 0) {
1.116 thorpej 1013: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1014: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1015: ICMP6_PARAMPROB_HEADER,
1016: erroff + opt + 2 - opthead);
1017: return (-1);
1.22 itojun 1018: }
1.8 itojun 1019: #endif
1.2 itojun 1020:
1.22 itojun 1021: /*
1022: * jumbo payload length must be larger than 65535.
1023: */
1024: if (jumboplen <= IPV6_MAXPACKET) {
1.116 thorpej 1025: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1026: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1027: ICMP6_PARAMPROB_HEADER,
1028: erroff + opt + 2 - opthead);
1029: return (-1);
1.22 itojun 1030: }
1031: *plenp = jumboplen;
1032:
1033: break;
1.35 itojun 1034: default: /* unknown option */
1035: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 1036: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 1037: goto bad;
1038: }
1.55 itojun 1039: optlen = ip6_unknown_opt(opt, m,
1040: erroff + opt - opthead);
1041: if (optlen == -1)
1042: return (-1);
1.35 itojun 1043: optlen += 2;
1044: break;
1.2 itojun 1045: }
1046: }
1047:
1.55 itojun 1048: return (0);
1.2 itojun 1049:
1050: bad:
1051: m_freem(m);
1.55 itojun 1052: return (-1);
1.2 itojun 1053: }
1054:
1055: /*
1056: * Unknown option processing.
1057: * The third argument `off' is the offset from the IPv6 header to the option,
1058: * which is necessary if the IPv6 header the and option header and IPv6 header
1059: * is not continuous in order to return an ICMPv6 error.
1060: */
1061: int
1.107 christos 1062: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2 itojun 1063: {
1064: struct ip6_hdr *ip6;
1065:
1.35 itojun 1066: switch (IP6OPT_TYPE(*optp)) {
1067: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 1068: return ((int)*(optp + 1));
1.35 itojun 1069: case IP6OPT_TYPE_DISCARD: /* silently discard */
1070: m_freem(m);
1.58 itojun 1071: return (-1);
1.35 itojun 1072: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116 thorpej 1073: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1074: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1075: return (-1);
1.35 itojun 1076: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116 thorpej 1077: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1078: ip6 = mtod(m, struct ip6_hdr *);
1079: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1080: (m->m_flags & (M_BCAST|M_MCAST)))
1081: m_freem(m);
1082: else
1083: icmp6_error(m, ICMP6_PARAM_PROB,
1084: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1085: return (-1);
1.2 itojun 1086: }
1087:
1088: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 1089: return (-1);
1.2 itojun 1090: }
1091:
1092: /*
1.9 itojun 1093: * Create the "control" list for this pcb.
1094: *
1095: * The routine will be called from upper layer handlers like tcp6_input().
1096: * Thus the routine assumes that the caller (tcp6_input) have already
1097: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1098: * very first mbuf on the mbuf chain.
1099: * We may want to add some infinite loop prevention or sanity checks for safety.
1100: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1101: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1102: */
1103: void
1.107 christos 1104: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1105: struct ip6_hdr *ip6, struct mbuf *m)
1.2 itojun 1106: {
1.85 rpaulo 1107: #ifdef RFC2292
1108: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1109: #else
1110: #define IS2292(x, y) (y)
1111: #endif
1112:
1.123 christos 1113: if (in6p->in6p_socket->so_options & SO_TIMESTAMP
1114: #ifdef SO_OTIMESTAMP
1115: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
1116: #endif
1117: ) {
1.2 itojun 1118: struct timeval tv;
1119:
1120: microtime(&tv);
1.123 christos 1121: #ifdef SO_OTIMESTAMP
1122: if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
1123: struct timeval50 tv50;
1124: timeval_to_timeval50(&tv, &tv50);
1125: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1126: SCM_OTIMESTAMP, SOL_SOCKET);
1127: } else
1128: #endif
1.97 christos 1129: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63 itojun 1130: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1131: if (*mp)
1132: mp = &(*mp)->m_next;
1133: }
1.87 rpaulo 1134:
1135: /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1136: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1137: return;
1138:
1.2 itojun 1139: /* RFC 2292 sec. 5 */
1.35 itojun 1140: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1141: struct in6_pktinfo pi6;
1.85 rpaulo 1142:
1.126 tsutsui 1143: memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81 rpaulo 1144: in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84 christos 1145: pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1146: m->m_pkthdr.rcvif->if_index : 0;
1.97 christos 1147: *mp = sbcreatecontrol((void *) &pi6,
1.85 rpaulo 1148: sizeof(struct in6_pktinfo),
1149: IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2 itojun 1150: if (*mp)
1151: mp = &(*mp)->m_next;
1152: }
1.85 rpaulo 1153:
1.2 itojun 1154: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1155: int hlim = ip6->ip6_hlim & 0xff;
1.85 rpaulo 1156:
1.97 christos 1157: *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85 rpaulo 1158: IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1159: if (*mp)
1160: mp = &(*mp)->m_next;
1161: }
1162:
1163: if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1164: u_int32_t flowinfo;
1165: int tclass;
1166:
1167: flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1168: flowinfo >>= 20;
1169:
1170: tclass = flowinfo & 0xff;
1.97 christos 1171: *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85 rpaulo 1172: IPV6_TCLASS, IPPROTO_IPV6);
1173:
1.2 itojun 1174: if (*mp)
1175: mp = &(*mp)->m_next;
1176: }
1177:
1178: /*
1.75 itojun 1179: * IPV6_HOPOPTS socket option. Recall that we required super-user
1180: * privilege for the option (see ip6_ctloutput), but it might be too
1181: * strict, since there might be some hop-by-hop options which can be
1182: * returned to normal user.
1.85 rpaulo 1183: * See also RFC3542 section 8 (or RFC2292 section 6).
1.2 itojun 1184: */
1.75 itojun 1185: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2 itojun 1186: /*
1187: * Check if a hop-by-hop options header is contatined in the
1188: * received packet, and if so, store the options as ancillary
1189: * data. Note that a hop-by-hop options header must be
1190: * just after the IPv6 header, which fact is assured through
1191: * the IPv6 input processing.
1192: */
1.78 christos 1193: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1194: if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1195: struct ip6_hbh *hbh;
1196: int hbhlen;
1.62 itojun 1197: struct mbuf *ext;
1.9 itojun 1198:
1.62 itojun 1199: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78 christos 1200: xip6->ip6_nxt);
1.62 itojun 1201: if (ext == NULL) {
1.116 thorpej 1202: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1203: return;
1204: }
1.62 itojun 1205: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1206: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1207: if (hbhlen != ext->m_len) {
1208: m_freem(ext);
1.116 thorpej 1209: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1210: return;
1211: }
1.2 itojun 1212:
1213: /*
1214: * XXX: We copy whole the header even if a jumbo
1215: * payload option is included, which option is to
1216: * be removed before returning in the RFC 2292.
1.85 rpaulo 1217: * Note: this constraint is removed in RFC3542.
1.2 itojun 1218: */
1.97 christos 1219: *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85 rpaulo 1220: IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1221: IPPROTO_IPV6);
1.2 itojun 1222: if (*mp)
1223: mp = &(*mp)->m_next;
1.62 itojun 1224: m_freem(ext);
1.2 itojun 1225: }
1226: }
1227:
1228: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1229: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78 christos 1230: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1231: int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1232:
1233: /*
1234: * Search for destination options headers or routing
1235: * header(s) through the header chain, and stores each
1236: * header as ancillary data.
1237: * Note that the order of the headers remains in
1238: * the chain of ancillary data.
1239: */
1.86 rpaulo 1240: for (;;) { /* is explicit loop prevention necessary? */
1.62 itojun 1241: struct ip6_ext *ip6e = NULL;
1.9 itojun 1242: int elen;
1.62 itojun 1243: struct mbuf *ext = NULL;
1.9 itojun 1244:
1.62 itojun 1245: /*
1246: * if it is not an extension header, don't try to
1247: * pull it from the chain.
1248: */
1249: switch (nxt) {
1250: case IPPROTO_DSTOPTS:
1251: case IPPROTO_ROUTING:
1252: case IPPROTO_HOPOPTS:
1253: case IPPROTO_AH: /* is it possible? */
1254: break;
1255: default:
1256: goto loopend;
1257: }
1258:
1259: ext = ip6_pullexthdr(m, off, nxt);
1260: if (ext == NULL) {
1.116 thorpej 1261: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1262: return;
1263: }
1.62 itojun 1264: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1265: if (nxt == IPPROTO_AH)
1266: elen = (ip6e->ip6e_len + 2) << 2;
1267: else
1268: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1269: if (elen != ext->m_len) {
1270: m_freem(ext);
1.116 thorpej 1271: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1272: return;
1273: }
1.57 thorpej 1274: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1275:
1.35 itojun 1276: switch (nxt) {
1.62 itojun 1277: case IPPROTO_DSTOPTS:
1.127 martin 1278: if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35 itojun 1279: break;
1280:
1.97 christos 1281: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1282: IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1283: IPPROTO_IPV6);
1.35 itojun 1284: if (*mp)
1285: mp = &(*mp)->m_next;
1286: break;
1287:
1288: case IPPROTO_ROUTING:
1.127 martin 1289: if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35 itojun 1290: break;
1291:
1.97 christos 1292: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1293: IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1294: IPPROTO_IPV6);
1.35 itojun 1295: if (*mp)
1296: mp = &(*mp)->m_next;
1297: break;
1298:
1.62 itojun 1299: case IPPROTO_HOPOPTS:
1300: case IPPROTO_AH: /* is it possible? */
1301: break;
1302:
1.35 itojun 1303: default:
1304: /*
1.62 itojun 1305: * other cases have been filtered in the above.
1306: * none will visit this case. here we supply
1307: * the code just in case (nxt overwritten or
1308: * other cases).
1.35 itojun 1309: */
1.62 itojun 1310: m_freem(ext);
1.35 itojun 1311: goto loopend;
1312:
1.2 itojun 1313: }
1314:
1315: /* proceed with the next header. */
1.9 itojun 1316: off += elen;
1.2 itojun 1317: nxt = ip6e->ip6e_nxt;
1.62 itojun 1318: ip6e = NULL;
1319: m_freem(ext);
1320: ext = NULL;
1.2 itojun 1321: }
1322: loopend:
1.62 itojun 1323: ;
1.2 itojun 1324: }
1.62 itojun 1325: }
1.85 rpaulo 1326: #undef IS2292
1327:
1328:
1329: void
1.95 dyoung 1330: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1331: uint32_t *mtu)
1.85 rpaulo 1332: {
1333: struct socket *so;
1334: struct mbuf *m_mtu;
1335: struct ip6_mtuinfo mtuctl;
1336:
1337: so = in6p->in6p_socket;
1338:
1339: if (mtu == NULL)
1340: return;
1341:
1342: #ifdef DIAGNOSTIC
1343: if (so == NULL) /* I believe this is impossible */
1344: panic("ip6_notify_pmtu: socket is NULL");
1345: #endif
1346:
1347: memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1348: mtuctl.ip6m_mtu = *mtu;
1349: mtuctl.ip6m_addr = *dst;
1350: if (sa6_recoverscope(&mtuctl.ip6m_addr))
1351: return;
1352:
1.97 christos 1353: if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85 rpaulo 1354: IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1355: return;
1356:
1.95 dyoung 1357: if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85 rpaulo 1358: == 0) {
1359: m_freem(m_mtu);
1360: /* XXX: should count statistics */
1361: } else
1362: sorwakeup(so);
1363:
1364: return;
1365: }
1.62 itojun 1366:
1367: /*
1368: * pull single extension header from mbuf chain. returns single mbuf that
1369: * contains the result, or NULL on error.
1370: */
1371: static struct mbuf *
1.107 christos 1372: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62 itojun 1373: {
1374: struct ip6_ext ip6e;
1375: size_t elen;
1376: struct mbuf *n;
1377:
1378: #ifdef DIAGNOSTIC
1379: switch (nxt) {
1380: case IPPROTO_DSTOPTS:
1381: case IPPROTO_ROUTING:
1382: case IPPROTO_HOPOPTS:
1383: case IPPROTO_AH: /* is it possible? */
1384: break;
1385: default:
1386: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1387: }
1.62 itojun 1388: #endif
1.2 itojun 1389:
1.97 christos 1390: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62 itojun 1391: if (nxt == IPPROTO_AH)
1392: elen = (ip6e.ip6e_len + 2) << 2;
1393: else
1394: elen = (ip6e.ip6e_len + 1) << 3;
1395:
1396: MGET(n, M_DONTWAIT, MT_DATA);
1397: if (n && elen >= MLEN) {
1398: MCLGET(n, M_DONTWAIT);
1399: if ((n->m_flags & M_EXT) == 0) {
1400: m_free(n);
1401: n = NULL;
1402: }
1403: }
1404: if (!n)
1405: return NULL;
1406:
1407: n->m_len = 0;
1408: if (elen >= M_TRAILINGSPACE(n)) {
1409: m_free(n);
1410: return NULL;
1411: }
1412:
1.97 christos 1413: m_copydata(m, off, elen, mtod(n, void *));
1.62 itojun 1414: n->m_len = elen;
1415: return n;
1.2 itojun 1416: }
1417:
1418: /*
1419: * Get pointer to the previous header followed by the header
1420: * currently processed.
1421: * XXX: This function supposes that
1422: * M includes all headers,
1423: * the next header field and the header length field of each header
1424: * are valid, and
1425: * the sum of each header length equals to OFF.
1426: * Because of these assumptions, this function must be called very
1427: * carefully. Moreover, it will not be used in the near future when
1428: * we develop `neater' mechanism to process extension headers.
1429: */
1.58 itojun 1430: u_int8_t *
1.107 christos 1431: ip6_get_prevhdr(struct mbuf *m, int off)
1.2 itojun 1432: {
1433: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1434:
1435: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1436: return (&ip6->ip6_nxt);
1.2 itojun 1437: else {
1438: int len, nxt;
1439: struct ip6_ext *ip6e = NULL;
1440:
1441: nxt = ip6->ip6_nxt;
1442: len = sizeof(struct ip6_hdr);
1443: while (len < off) {
1.97 christos 1444: ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2 itojun 1445:
1.35 itojun 1446: switch (nxt) {
1.2 itojun 1447: case IPPROTO_FRAGMENT:
1448: len += sizeof(struct ip6_frag);
1449: break;
1450: case IPPROTO_AH:
1451: len += (ip6e->ip6e_len + 2) << 2;
1452: break;
1453: default:
1454: len += (ip6e->ip6e_len + 1) << 3;
1455: break;
1456: }
1457: nxt = ip6e->ip6e_nxt;
1458: }
1459: if (ip6e)
1.58 itojun 1460: return (&ip6e->ip6e_nxt);
1.2 itojun 1461: else
1462: return NULL;
1.18 itojun 1463: }
1464: }
1465:
1466: /*
1467: * get next header offset. m will be retained.
1468: */
1469: int
1.107 christos 1470: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1471: {
1472: struct ip6_hdr ip6;
1473: struct ip6_ext ip6e;
1474: struct ip6_frag fh;
1475:
1476: /* just in case */
1477: if (m == NULL)
1478: panic("ip6_nexthdr: m == NULL");
1479: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1480: return -1;
1481:
1482: switch (proto) {
1483: case IPPROTO_IPV6:
1.83 rpaulo 1484: /* do not chase beyond intermediate IPv6 headers */
1485: if (off != 0)
1486: return -1;
1.18 itojun 1487: if (m->m_pkthdr.len < off + sizeof(ip6))
1488: return -1;
1.97 christos 1489: m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18 itojun 1490: if (nxtp)
1491: *nxtp = ip6.ip6_nxt;
1492: off += sizeof(ip6);
1493: return off;
1494:
1495: case IPPROTO_FRAGMENT:
1496: /*
1497: * terminate parsing if it is not the first fragment,
1498: * it does not make sense to parse through it.
1499: */
1500: if (m->m_pkthdr.len < off + sizeof(fh))
1501: return -1;
1.97 christos 1502: m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67 itojun 1503: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1504: return -1;
1505: if (nxtp)
1506: *nxtp = fh.ip6f_nxt;
1507: off += sizeof(struct ip6_frag);
1508: return off;
1509:
1510: case IPPROTO_AH:
1511: if (m->m_pkthdr.len < off + sizeof(ip6e))
1512: return -1;
1.97 christos 1513: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1514: if (nxtp)
1515: *nxtp = ip6e.ip6e_nxt;
1516: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1517: if (m->m_pkthdr.len < off)
1518: return -1;
1.18 itojun 1519: return off;
1520:
1521: case IPPROTO_HOPOPTS:
1522: case IPPROTO_ROUTING:
1523: case IPPROTO_DSTOPTS:
1524: if (m->m_pkthdr.len < off + sizeof(ip6e))
1525: return -1;
1.97 christos 1526: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1527: if (nxtp)
1528: *nxtp = ip6e.ip6e_nxt;
1529: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1530: if (m->m_pkthdr.len < off)
1531: return -1;
1.18 itojun 1532: return off;
1533:
1534: case IPPROTO_NONE:
1535: case IPPROTO_ESP:
1536: case IPPROTO_IPCOMP:
1537: /* give up */
1538: return -1;
1539:
1540: default:
1541: return -1;
1542: }
1543: }
1544:
1545: /*
1546: * get offset for the last header in the chain. m will be kept untainted.
1547: */
1548: int
1.107 christos 1549: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1550: {
1551: int newoff;
1552: int nxt;
1553:
1554: if (!nxtp) {
1555: nxt = -1;
1556: nxtp = &nxt;
1557: }
1.86 rpaulo 1558: for (;;) {
1.18 itojun 1559: newoff = ip6_nexthdr(m, off, proto, nxtp);
1560: if (newoff < 0)
1561: return off;
1562: else if (newoff < off)
1563: return -1; /* invalid */
1564: else if (newoff == off)
1565: return newoff;
1566:
1567: off = newoff;
1568: proto = *nxtp;
1.2 itojun 1569: }
1570: }
1571:
1.81 rpaulo 1572: struct m_tag *
1.107 christos 1573: ip6_addaux(struct mbuf *m)
1.81 rpaulo 1574: {
1575: struct m_tag *mtag;
1576:
1577: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1578: if (!mtag) {
1579: mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1580: M_NOWAIT);
1581: if (mtag) {
1582: m_tag_prepend(m, mtag);
1.124 cegger 1583: memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81 rpaulo 1584: }
1585: }
1586: return mtag;
1587: }
1588:
1589: struct m_tag *
1.107 christos 1590: ip6_findaux(struct mbuf *m)
1.81 rpaulo 1591: {
1592: struct m_tag *mtag;
1593:
1594: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1595: return mtag;
1596: }
1597:
1598: void
1.107 christos 1599: ip6_delaux(struct mbuf *m)
1.81 rpaulo 1600: {
1601: struct m_tag *mtag;
1602:
1603: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1604: if (mtag)
1605: m_tag_delete(m, mtag);
1606: }
1607:
1.98 liamjfoy 1608: #ifdef GATEWAY
1609: /*
1610: * sysctl helper routine for net.inet.ip6.maxflows. Since
1611: * we could reduce this value, call ip6flow_reap();
1612: */
1613: static int
1.101 liamjfoy 1614: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98 liamjfoy 1615: {
1.121 simonb 1616: int error;
1.98 liamjfoy 1617:
1.121 simonb 1618: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1619: if (error || newp == NULL)
1620: return (error);
1.98 liamjfoy 1621:
1.121 simonb 1622: mutex_enter(softnet_lock);
1.122 matt 1623: KERNEL_LOCK(1, NULL);
1.120 matt 1624:
1.121 simonb 1625: ip6flow_reap(0);
1.120 matt 1626:
1627: KERNEL_UNLOCK_ONE(NULL);
1.121 simonb 1628: mutex_exit(softnet_lock);
1.98 liamjfoy 1629:
1.121 simonb 1630: return (0);
1.98 liamjfoy 1631: }
1.99 liamjfoy 1632:
1633: static int
1634: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1635: {
1636: int error, tmp;
1637: struct sysctlnode node;
1638:
1639: node = *rnode;
1640: tmp = ip6_hashsize;
1641: node.sysctl_data = &tmp;
1642: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1643: if (error || newp == NULL)
1644: return (error);
1645:
1646: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1647: /*
1648: * Can only fail due to malloc()
1649: */
1.120 matt 1650: mutex_enter(softnet_lock);
1.122 matt 1651: KERNEL_LOCK(1, NULL);
1.120 matt 1652:
1653: error = ip6flow_invalidate_all(tmp);
1654:
1655: KERNEL_UNLOCK_ONE(NULL);
1656: mutex_exit(softnet_lock);
1.99 liamjfoy 1657: } else {
1658: /*
1659: * EINVAL if not a power of 2
1.121 simonb 1660: */
1.120 matt 1661: error = EINVAL;
1.99 liamjfoy 1662: }
1663:
1.120 matt 1664: return error;
1.99 liamjfoy 1665: }
1.98 liamjfoy 1666: #endif /* GATEWAY */
1667:
1.2 itojun 1668: /*
1669: * System control for IP6
1670: */
1671:
1.120 matt 1672: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2 itojun 1673: 0, 0, 0, 0,
1674: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1675: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1676: EMSGSIZE, EHOSTUNREACH, 0, 0,
1677: 0, 0, 0, 0,
1678: ENOPROTOOPT
1679: };
1680:
1.116 thorpej 1681: static int
1682: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1683: {
1684:
1.119 thorpej 1685: return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116 thorpej 1686: }
1687:
1.128 ! pooka 1688: static void
! 1689: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2 itojun 1690: {
1.85 rpaulo 1691: #ifdef RFC2292
1692: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1693: #else
1694: #define IS2292(x, y) (y)
1695: #endif
1.26 itojun 1696:
1.73 atatat 1697: sysctl_createv(clog, 0, NULL, NULL,
1698: CTLFLAG_PERMANENT,
1.70 atatat 1699: CTLTYPE_NODE, "net", NULL,
1700: NULL, 0, NULL, 0,
1701: CTL_NET, CTL_EOL);
1.73 atatat 1702: sysctl_createv(clog, 0, NULL, NULL,
1703: CTLFLAG_PERMANENT,
1.74 atatat 1704: CTLTYPE_NODE, "inet6",
1705: SYSCTL_DESCR("PF_INET6 related settings"),
1.70 atatat 1706: NULL, 0, NULL, 0,
1707: CTL_NET, PF_INET6, CTL_EOL);
1.73 atatat 1708: sysctl_createv(clog, 0, NULL, NULL,
1709: CTLFLAG_PERMANENT,
1.74 atatat 1710: CTLTYPE_NODE, "ip6",
1711: SYSCTL_DESCR("IPv6 related settings"),
1.70 atatat 1712: NULL, 0, NULL, 0,
1713: CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1714:
1.73 atatat 1715: sysctl_createv(clog, 0, NULL, NULL,
1716: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1717: CTLTYPE_INT, "forwarding",
1718: SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70 atatat 1719: NULL, 0, &ip6_forwarding, 0,
1720: CTL_NET, PF_INET6, IPPROTO_IPV6,
1721: IPV6CTL_FORWARDING, CTL_EOL);
1.73 atatat 1722: sysctl_createv(clog, 0, NULL, NULL,
1723: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1724: CTLTYPE_INT, "redirect",
1725: SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70 atatat 1726: NULL, 0, &ip6_sendredirects, 0,
1727: CTL_NET, PF_INET6, IPPROTO_IPV6,
1728: IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73 atatat 1729: sysctl_createv(clog, 0, NULL, NULL,
1730: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1731: CTLTYPE_INT, "hlim",
1732: SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70 atatat 1733: NULL, 0, &ip6_defhlim, 0,
1734: CTL_NET, PF_INET6, IPPROTO_IPV6,
1735: IPV6CTL_DEFHLIM, CTL_EOL);
1736: #ifdef notyet
1.73 atatat 1737: sysctl_createv(clog, 0, NULL, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1739: CTLTYPE_INT, "mtu", NULL,
1740: NULL, 0, &, 0,
1741: CTL_NET, PF_INET6, IPPROTO_IPV6,
1742: IPV6CTL_DEFMTU, CTL_EOL);
1743: #endif
1744: #ifdef __no_idea__
1.73 atatat 1745: sysctl_createv(clog, 0, NULL, NULL,
1746: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1747: CTLTYPE_INT, "forwsrcrt", NULL,
1748: NULL, 0, &?, 0,
1749: CTL_NET, PF_INET6, IPPROTO_IPV6,
1750: IPV6CTL_FORWSRCRT, CTL_EOL);
1.73 atatat 1751: sysctl_createv(clog, 0, NULL, NULL,
1752: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1753: CTLTYPE_STRUCT, "mrtstats", NULL,
1754: NULL, 0, &?, sizeof(?),
1755: CTL_NET, PF_INET6, IPPROTO_IPV6,
1756: IPV6CTL_MRTSTATS, CTL_EOL);
1.73 atatat 1757: sysctl_createv(clog, 0, NULL, NULL,
1758: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1759: CTLTYPE_?, "mrtproto", NULL,
1760: NULL, 0, &?, sizeof(?),
1761: CTL_NET, PF_INET6, IPPROTO_IPV6,
1762: IPV6CTL_MRTPROTO, CTL_EOL);
1763: #endif
1.73 atatat 1764: sysctl_createv(clog, 0, NULL, NULL,
1765: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1766: CTLTYPE_INT, "maxfragpackets",
1767: SYSCTL_DESCR("Maximum number of fragments to buffer "
1768: "for reassembly"),
1.70 atatat 1769: NULL, 0, &ip6_maxfragpackets, 0,
1770: CTL_NET, PF_INET6, IPPROTO_IPV6,
1771: IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1772: #ifdef __no_idea__
1.73 atatat 1773: sysctl_createv(clog, 0, NULL, NULL,
1774: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1775: CTLTYPE_INT, "sourcecheck", NULL,
1776: NULL, 0, &?, 0,
1777: CTL_NET, PF_INET6, IPPROTO_IPV6,
1778: IPV6CTL_SOURCECHECK, CTL_EOL);
1.73 atatat 1779: sysctl_createv(clog, 0, NULL, NULL,
1780: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1781: CTLTYPE_INT, "sourcecheck_logint", NULL,
1782: NULL, 0, &?, 0,
1783: CTL_NET, PF_INET6, IPPROTO_IPV6,
1784: IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1785: #endif
1.73 atatat 1786: sysctl_createv(clog, 0, NULL, NULL,
1787: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1788: CTLTYPE_INT, "accept_rtadv",
1789: SYSCTL_DESCR("Accept router advertisements"),
1.70 atatat 1790: NULL, 0, &ip6_accept_rtadv, 0,
1791: CTL_NET, PF_INET6, IPPROTO_IPV6,
1792: IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73 atatat 1793: sysctl_createv(clog, 0, NULL, NULL,
1794: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1795: CTLTYPE_INT, "keepfaith",
1796: SYSCTL_DESCR("Activate faith interface"),
1.70 atatat 1797: NULL, 0, &ip6_keepfaith, 0,
1798: CTL_NET, PF_INET6, IPPROTO_IPV6,
1799: IPV6CTL_KEEPFAITH, CTL_EOL);
1.73 atatat 1800: sysctl_createv(clog, 0, NULL, NULL,
1801: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1802: CTLTYPE_INT, "log_interval",
1803: SYSCTL_DESCR("Minumum interval between logging "
1804: "unroutable packets"),
1.70 atatat 1805: NULL, 0, &ip6_log_interval, 0,
1806: CTL_NET, PF_INET6, IPPROTO_IPV6,
1807: IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73 atatat 1808: sysctl_createv(clog, 0, NULL, NULL,
1809: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1810: CTLTYPE_INT, "hdrnestlimit",
1811: SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70 atatat 1812: NULL, 0, &ip6_hdrnestlimit, 0,
1813: CTL_NET, PF_INET6, IPPROTO_IPV6,
1814: IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73 atatat 1815: sysctl_createv(clog, 0, NULL, NULL,
1816: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1817: CTLTYPE_INT, "dad_count",
1818: SYSCTL_DESCR("Number of Duplicate Address Detection "
1819: "probes to send"),
1.70 atatat 1820: NULL, 0, &ip6_dad_count, 0,
1821: CTL_NET, PF_INET6, IPPROTO_IPV6,
1822: IPV6CTL_DAD_COUNT, CTL_EOL);
1.73 atatat 1823: sysctl_createv(clog, 0, NULL, NULL,
1824: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1825: CTLTYPE_INT, "auto_flowlabel",
1826: SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70 atatat 1827: NULL, 0, &ip6_auto_flowlabel, 0,
1828: CTL_NET, PF_INET6, IPPROTO_IPV6,
1829: IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73 atatat 1830: sysctl_createv(clog, 0, NULL, NULL,
1831: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1832: CTLTYPE_INT, "defmcasthlim",
1833: SYSCTL_DESCR("Default multicast hop limit"),
1.70 atatat 1834: NULL, 0, &ip6_defmcasthlim, 0,
1835: CTL_NET, PF_INET6, IPPROTO_IPV6,
1836: IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51 itojun 1837: #if NGIF > 0
1.73 atatat 1838: sysctl_createv(clog, 0, NULL, NULL,
1839: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1840: CTLTYPE_INT, "gifhlim",
1841: SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70 atatat 1842: NULL, 0, &ip6_gif_hlim, 0,
1843: CTL_NET, PF_INET6, IPPROTO_IPV6,
1844: IPV6CTL_GIF_HLIM, CTL_EOL);
1845: #endif /* NGIF */
1.73 atatat 1846: sysctl_createv(clog, 0, NULL, NULL,
1847: CTLFLAG_PERMANENT,
1.74 atatat 1848: CTLTYPE_STRING, "kame_version",
1849: SYSCTL_DESCR("KAME Version"),
1.78 christos 1850: NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70 atatat 1851: CTL_NET, PF_INET6, IPPROTO_IPV6,
1852: IPV6CTL_KAME_VERSION, CTL_EOL);
1.73 atatat 1853: sysctl_createv(clog, 0, NULL, NULL,
1854: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1855: CTLTYPE_INT, "use_deprecated",
1856: SYSCTL_DESCR("Allow use of deprecated addresses as "
1857: "source addresses"),
1.70 atatat 1858: NULL, 0, &ip6_use_deprecated, 0,
1859: CTL_NET, PF_INET6, IPPROTO_IPV6,
1860: IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73 atatat 1861: sysctl_createv(clog, 0, NULL, NULL,
1862: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1863: CTLTYPE_INT, "rr_prune", NULL,
1864: NULL, 0, &ip6_rr_prune, 0,
1865: CTL_NET, PF_INET6, IPPROTO_IPV6,
1866: IPV6CTL_RR_PRUNE, CTL_EOL);
1.73 atatat 1867: sysctl_createv(clog, 0, NULL, NULL,
1868: CTLFLAG_PERMANENT
1.70 atatat 1869: #ifndef INET6_BINDV6ONLY
1.73 atatat 1870: |CTLFLAG_READWRITE,
1.70 atatat 1871: #endif
1.74 atatat 1872: CTLTYPE_INT, "v6only",
1873: SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1874: "to PF_INET sockets"),
1.70 atatat 1875: NULL, 0, &ip6_v6only, 0,
1876: CTL_NET, PF_INET6, IPPROTO_IPV6,
1877: IPV6CTL_V6ONLY, CTL_EOL);
1.73 atatat 1878: sysctl_createv(clog, 0, NULL, NULL,
1879: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1880: CTLTYPE_INT, "anonportmin",
1881: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70 atatat 1882: sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1883: CTL_NET, PF_INET6, IPPROTO_IPV6,
1884: IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73 atatat 1885: sysctl_createv(clog, 0, NULL, NULL,
1886: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1887: CTLTYPE_INT, "anonportmax",
1888: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70 atatat 1889: sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1890: CTL_NET, PF_INET6, IPPROTO_IPV6,
1891: IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26 itojun 1892: #ifndef IPNOPRIVPORTS
1.73 atatat 1893: sysctl_createv(clog, 0, NULL, NULL,
1894: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1895: CTLTYPE_INT, "lowportmin",
1896: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1897: "to assign"),
1.70 atatat 1898: sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1899: CTL_NET, PF_INET6, IPPROTO_IPV6,
1900: IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73 atatat 1901: sysctl_createv(clog, 0, NULL, NULL,
1902: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1903: CTLTYPE_INT, "lowportmax",
1904: SYSCTL_DESCR("Highest privileged ephemeral port number "
1905: "to assign"),
1.70 atatat 1906: sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1907: CTL_NET, PF_INET6, IPPROTO_IPV6,
1908: IPV6CTL_LOWPORTMAX, CTL_EOL);
1909: #endif /* IPNOPRIVPORTS */
1.73 atatat 1910: sysctl_createv(clog, 0, NULL, NULL,
1911: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83 rpaulo 1912: CTLTYPE_INT, "use_tempaddr",
1913: SYSCTL_DESCR("Use temporary address"),
1914: NULL, 0, &ip6_use_tempaddr, 0,
1915: CTL_NET, PF_INET6, IPPROTO_IPV6,
1916: CTL_CREATE, CTL_EOL);
1917: sysctl_createv(clog, 0, NULL, NULL,
1918: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1919: CTLTYPE_INT, "temppltime",
1920: SYSCTL_DESCR("preferred lifetime of a temporary address"),
1921: NULL, 0, &ip6_temp_preferred_lifetime, 0,
1922: CTL_NET, PF_INET6, IPPROTO_IPV6,
1923: CTL_CREATE, CTL_EOL);
1924: sysctl_createv(clog, 0, NULL, NULL,
1925: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1926: CTLTYPE_INT, "tempvltime",
1927: SYSCTL_DESCR("valid lifetime of a temporary address"),
1928: NULL, 0, &ip6_temp_valid_lifetime, 0,
1929: CTL_NET, PF_INET6, IPPROTO_IPV6,
1930: CTL_CREATE, CTL_EOL);
1931: sysctl_createv(clog, 0, NULL, NULL,
1932: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1933: CTLTYPE_INT, "maxfrags",
1934: SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70 atatat 1935: NULL, 0, &ip6_maxfrags, 0,
1936: CTL_NET, PF_INET6, IPPROTO_IPV6,
1937: IPV6CTL_MAXFRAGS, CTL_EOL);
1.79 rpaulo 1938: sysctl_createv(clog, 0, NULL, NULL,
1939: CTLFLAG_PERMANENT,
1940: CTLTYPE_STRUCT, "stats",
1941: SYSCTL_DESCR("IPv6 statistics"),
1.116 thorpej 1942: sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79 rpaulo 1943: CTL_NET, PF_INET6, IPPROTO_IPV6,
1944: IPV6CTL_STATS, CTL_EOL);
1.81 rpaulo 1945: sysctl_createv(clog, 0, NULL, NULL,
1946: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1947: CTLTYPE_INT, "use_defaultzone",
1948: SYSCTL_DESCR("Whether to use the default scope zones"),
1949: NULL, 0, &ip6_use_defzone, 0,
1950: CTL_NET, PF_INET6, IPPROTO_IPV6,
1951: IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83 rpaulo 1952: sysctl_createv(clog, 0, NULL, NULL,
1953: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1954: CTLTYPE_INT, "mcast_pmtu",
1955: SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1956: NULL, 0, &ip6_mcast_pmtu, 0,
1957: CTL_NET, PF_INET6, IPPROTO_IPV6,
1958: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1959: #ifdef GATEWAY
1960: sysctl_createv(clog, 0, NULL, NULL,
1961: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1962: CTLTYPE_INT, "maxflows",
1963: SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101 liamjfoy 1964: sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98 liamjfoy 1965: CTL_NET, PF_INET6, IPPROTO_IPV6,
1966: CTL_CREATE, CTL_EOL);
1.99 liamjfoy 1967: sysctl_createv(clog, 0, NULL, NULL,
1968: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1969: CTLTYPE_INT, "hashsize",
1970: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1971: sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1972: CTL_NET, PF_INET6, IPPROTO_IPV6,
1973: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1974: #endif
1.2 itojun 1975: }
1.116 thorpej 1976:
1977: void
1978: ip6_statinc(u_int stat)
1979: {
1980:
1981: KASSERT(stat < IP6_NSTATS);
1982: IP6_STATINC(stat);
1983: }
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