Annotation of src/sys/netinet6/ip6_input.c, Revision 1.126
1.126 ! tsutsui 1: /* $NetBSD: ip6_input.c,v 1.125 2009/03/18 17:06:52 cegger 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>
1.126 ! tsutsui 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.125 2009/03/18 17:06:52 cegger 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);
1.2 itojun 164:
165: /*
166: * IP6 initialization: fill in IP6 protocol switch table.
167: * All protocols not implemented in kernel go to raw IP6 protocol handler.
168: */
169: void
1.114 matt 170: ip6_init(void)
1.2 itojun 171: {
1.78 christos 172: const struct ip6protosw *pr;
1.35 itojun 173: int i;
1.2 itojun 174:
1.78 christos 175: pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2 itojun 176: if (pr == 0)
177: panic("ip6_init");
178: for (i = 0; i < IPPROTO_MAX; i++)
179: ip6_protox[i] = pr - inet6sw;
1.78 christos 180: for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
181: pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2 itojun 182: if (pr->pr_domain->dom_family == PF_INET6 &&
183: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
184: ip6_protox[pr->pr_protocol] = pr - inet6sw;
185: ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81 rpaulo 186: scope6_init();
187: addrsel_policy_init();
1.2 itojun 188: nd6_init();
189: frag6_init();
1.83 rpaulo 190: ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2 itojun 191:
192: ip6_init2((void *)0);
1.98 liamjfoy 193: #ifdef GATEWAY
1.99 liamjfoy 194: ip6flow_init(ip6_hashsize);
1.98 liamjfoy 195: #endif
1.29 thorpej 196:
197: #ifdef PFIL_HOOKS
198: /* Register our Packet Filter hook. */
1.33 thorpej 199: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
200: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 201: i = pfil_head_register(&inet6_pfil_hook);
202: if (i != 0)
203: printf("ip6_init: WARNING: unable to register pfil hook, "
204: "error %d\n", i);
205: #endif /* PFIL_HOOKS */
1.116 thorpej 206:
207: ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2 itojun 208: }
209:
210: static void
1.90 christos 211: ip6_init2(void *dummy)
1.2 itojun 212: {
213:
214: /* nd6_timer_init */
1.118 ad 215: callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19 thorpej 216: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83 rpaulo 217:
218: /* timer for regeneranation of temporary addresses randomize ID */
1.118 ad 219: callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83 rpaulo 220: callout_reset(&in6_tmpaddrtimer_ch,
221: (ip6_temp_preferred_lifetime - ip6_desync_factor -
222: ip6_temp_regen_advance) * hz,
223: in6_tmpaddrtimer, NULL);
1.2 itojun 224: }
225:
226: /*
227: * IP6 input interrupt handling. Just pass the packet to ip6_input.
228: */
229: void
1.114 matt 230: ip6intr(void)
1.2 itojun 231: {
232: int s;
233: struct mbuf *m;
234:
1.118 ad 235: mutex_enter(softnet_lock);
236: KERNEL_LOCK(1, NULL);
1.2 itojun 237: for (;;) {
1.41 thorpej 238: s = splnet();
1.2 itojun 239: IF_DEQUEUE(&ip6intrq, m);
240: splx(s);
241: if (m == 0)
1.118 ad 242: break;
1.83 rpaulo 243: /* drop the packet if IPv6 operation is disabled on the IF */
244: if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
245: m_freem(m);
1.118 ad 246: break;
1.83 rpaulo 247: }
1.2 itojun 248: ip6_input(m);
249: }
1.118 ad 250: KERNEL_UNLOCK_ONE(NULL);
251: mutex_exit(softnet_lock);
1.2 itojun 252: }
253:
1.103 dyoung 254: extern struct route ip6_forward_rt;
1.2 itojun 255:
256: void
1.96 dyoung 257: ip6_input(struct mbuf *m)
1.2 itojun 258: {
1.9 itojun 259: struct ip6_hdr *ip6;
1.105 dyoung 260: int hit, off = sizeof(struct ip6_hdr), nest;
1.2 itojun 261: u_int32_t plen;
1.5 itojun 262: u_int32_t rtalert = ~0;
1.104 yamt 263: int nxt, ours = 0, rh_present = 0;
1.9 itojun 264: struct ifnet *deliverifp = NULL;
1.64 itojun 265: int srcrt = 0;
1.105 dyoung 266: const struct rtentry *rt;
267: union {
268: struct sockaddr dst;
269: struct sockaddr_in6 dst6;
270: } u;
1.94 degroote 271: #ifdef FAST_IPSEC
272: struct m_tag *mtag;
273: struct tdb_ident *tdbi;
274: struct secpolicy *sp;
275: int s, error;
276: #endif
1.2 itojun 277:
278: #ifdef IPSEC
279: /*
280: * should the inner packet be considered authentic?
281: * see comment in ah4_input().
282: */
1.49 itojun 283: m->m_flags &= ~M_AUTHIPHDR;
284: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 285: #endif
1.9 itojun 286:
1.2 itojun 287: /*
1.81 rpaulo 288: * make sure we don't have onion peering information into m_tag.
289: */
290: ip6_delaux(m);
291:
292: /*
1.44 itojun 293: * mbuf statistics
1.2 itojun 294: */
295: if (m->m_flags & M_EXT) {
296: if (m->m_next)
1.116 thorpej 297: IP6_STATINC(IP6_STAT_MEXT2M);
1.2 itojun 298: else
1.116 thorpej 299: IP6_STATINC(IP6_STAT_MEXT1);
1.2 itojun 300: } else {
1.115 thorpej 301: #define M2MMAX 32
1.2 itojun 302: if (m->m_next) {
1.9 itojun 303: if (m->m_flags & M_LOOP) {
1.116 thorpej 304: /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115 thorpej 305: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116 thorpej 306: IP6_STATINC(IP6_STAT_M2M +
307: m->m_pkthdr.rcvif->if_index);
1.115 thorpej 308: } else
1.116 thorpej 309: IP6_STATINC(IP6_STAT_M2M);
1.2 itojun 310: } else
1.116 thorpej 311: IP6_STATINC(IP6_STAT_M1);
1.40 itojun 312: #undef M2MMAX
1.2 itojun 313: }
314:
1.9 itojun 315: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116 thorpej 316: IP6_STATINC(IP6_STAT_TOTAL);
1.9 itojun 317:
1.57 thorpej 318: /*
319: * If the IPv6 header is not aligned, slurp it up into a new
320: * mbuf with space for link headers, in the event we forward
1.81 rpaulo 321: * it. Otherwise, if it is aligned, make sure the entire base
1.57 thorpej 322: * IPv6 header is in the first mbuf of the chain.
323: */
1.97 christos 324: if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57 thorpej 325: struct ifnet *inifp = m->m_pkthdr.rcvif;
326: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
327: (max_linkhdr + 3) & ~3)) == NULL) {
328: /* XXXJRT new stat, please */
1.116 thorpej 329: IP6_STATINC(IP6_STAT_TOOSMALL);
1.57 thorpej 330: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
331: return;
332: }
333: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
334: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 335: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116 thorpej 336: IP6_STATINC(IP6_STAT_TOOSMALL);
1.9 itojun 337: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
338: return;
339: }
1.2 itojun 340: }
341:
342: ip6 = mtod(m, struct ip6_hdr *);
343:
344: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116 thorpej 345: IP6_STATINC(IP6_STAT_BADVERS);
1.9 itojun 346: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 347: goto bad;
348: }
1.15 darrenr 349:
1.98 liamjfoy 350: #if defined(IPSEC)
351: /* IPv6 fast forwarding is not compatible with IPsec. */
352: m->m_flags &= ~M_CANFASTFWD;
353: #else
354: /*
355: * Assume that we can create a fast-forward IP flow entry
356: * based on this packet.
357: */
358: m->m_flags |= M_CANFASTFWD;
359: #endif
360:
1.15 darrenr 361: #ifdef PFIL_HOOKS
362: /*
363: * Run through list of hooks for input packets. If there are any
364: * filters which require that additional packets in the flow are
365: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
366: * Note that filters must _never_ set this flag, as another filter
367: * in the list may have previously cleared it.
368: */
1.39 itojun 369: /*
370: * let ipfilter look at packet on the wire,
371: * not the decapsulated packet.
372: */
373: #ifdef IPSEC
1.42 itojun 374: if (!ipsec_getnhist(m))
1.94 degroote 375: #elif defined(FAST_IPSEC)
376: if (!ipsec_indone(m))
1.39 itojun 377: #else
378: if (1)
379: #endif
380: {
1.64 itojun 381: struct in6_addr odst;
382:
383: odst = ip6->ip6_dst;
1.39 itojun 384: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
385: PFIL_IN) != 0)
386: return;
387: if (m == NULL)
388: return;
389: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 390: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 391: }
1.15 darrenr 392: #endif /* PFIL_HOOKS */
393:
1.116 thorpej 394: IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2 itojun 395:
1.30 thorpej 396: #ifdef ALTQ
397: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
398: /* packet is dropped by traffic conditioner */
399: return;
1.9 itojun 400: }
401: #endif
402:
1.2 itojun 403: /*
1.44 itojun 404: * Check against address spoofing/corruption.
1.2 itojun 405: */
406: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
407: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 408: /*
409: * XXX: "badscope" is not very suitable for a multicast source.
410: */
1.116 thorpej 411: IP6_STATINC(IP6_STAT_BADSCOPE);
1.9 itojun 412: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 413: goto bad;
414: }
1.13 itojun 415: /*
1.44 itojun 416: * The following check is not documented in specs. A malicious
417: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
418: * and bypass security checks (act as if it was from 127.0.0.1 by using
419: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 420: *
1.44 itojun 421: * This check chokes if we are in an SIIT cloud. As none of BSDs
422: * support IPv4-less kernel compilation, we cannot support SIIT
423: * environment at all. So, it makes more sense for us to reject any
424: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 425: * partial support for SIIT environment.
1.13 itojun 426: */
427: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
428: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 429: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 430: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
431: goto bad;
432: }
1.17 itojun 433: #if 0
1.13 itojun 434: /*
1.17 itojun 435: * Reject packets with IPv4 compatible addresses (auto tunnel).
436: *
437: * The code forbids auto tunnel relay case in RFC1933 (the check is
438: * stronger than RFC1933). We may want to re-enable it if mech-xx
439: * is revised to forbid relaying case.
1.13 itojun 440: */
441: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
442: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116 thorpej 443: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 444: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
445: goto bad;
446: }
447: #endif
1.35 itojun 448:
1.2 itojun 449: /*
1.82 yamt 450: * Disambiguate address scope zones (if there is ambiguity).
451: * We first make sure that the original source or destination address
452: * is not in our internal form for scoped addresses. Such addresses
453: * are not necessarily invalid spec-wise, but we cannot accept them due
454: * to the usage conflict.
455: * in6_setscope() then also checks and rejects the cases where src or
456: * dst are the loopback address and the receiving interface
457: * is not loopback.
458: */
1.88 bouyer 459: if (__predict_false(
460: m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
461: goto bad;
462: ip6 = mtod(m, struct ip6_hdr *);
1.82 yamt 463: if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116 thorpej 464: IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82 yamt 465: goto bad;
466: }
467: if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
468: in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116 thorpej 469: IP6_STATINC(IP6_STAT_BADSCOPE);
1.82 yamt 470: goto bad;
471: }
472:
473: /*
1.2 itojun 474: * Multicast check
475: */
476: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
477: struct in6_multi *in6m = 0;
1.9 itojun 478:
479: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 480: /*
481: * See if we belong to the destination multicast group on the
482: * arrival interface.
483: */
484: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
485: if (in6m)
486: ours = 1;
487: else if (!ip6_mrouter) {
1.116 thorpej 488: uint64_t *ip6s = IP6_STAT_GETREF();
489: ip6s[IP6_STAT_NOTMEMBER]++;
490: ip6s[IP6_STAT_CANTFORWARD]++;
491: IP6_STAT_PUTREF();
1.9 itojun 492: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 493: goto bad;
494: }
1.9 itojun 495: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 496: goto hbhcheck;
497: }
498:
1.105 dyoung 499: sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
500:
1.2 itojun 501: /*
502: * Unicast check
503: */
1.105 dyoung 504: rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
505: if (hit)
1.116 thorpej 506: IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93 joerg 507: else
1.116 thorpej 508: IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22 itojun 509:
1.109 dyoung 510: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2 itojun 511:
512: /*
513: * Accept the packet if the forwarding interface to the destination
514: * according to the routing table is the loopback interface,
515: * unless the associated route has a gateway.
516: * Note that this approach causes to accept a packet if there is a
517: * route to the loopback interface for the destination of the packet.
518: * But we think it's even useful in some situations, e.g. when using
519: * a special daemon which wants to intercept the packet.
520: */
1.105 dyoung 521: if (rt != NULL &&
522: (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
523: !(rt->rt_flags & RTF_CLONED) &&
1.2 itojun 524: #if 0
525: /*
526: * The check below is redundant since the comparison of
527: * the destination and the key of the rtentry has
528: * already done through looking up the routing table.
529: */
1.109 dyoung 530: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2 itojun 531: #endif
1.105 dyoung 532: rt->rt_ifp->if_type == IFT_LOOP) {
533: struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2 itojun 534: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
535: m->m_flags |= M_ANYCAST6;
1.24 itojun 536: /*
537: * packets to a tentative, duplicated, or somehow invalid
538: * address must not be accepted.
539: */
1.2 itojun 540: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 541: /* this address is ready */
1.2 itojun 542: ours = 1;
1.9 itojun 543: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 544: goto hbhcheck;
545: } else {
1.24 itojun 546: /* address is not ready, so discard the packet. */
1.34 itojun 547: nd6log((LOG_INFO,
1.27 itojun 548: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 549: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 550: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 551:
552: goto bad;
1.2 itojun 553: }
554: }
555:
556: /*
1.55 itojun 557: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 558: */
559: #if defined(NFAITH) && 0 < NFAITH
560: if (ip6_keepfaith) {
1.105 dyoung 561: if (rt != NULL && rt->rt_ifp != NULL &&
562: rt->rt_ifp->if_type == IFT_FAITH) {
1.2 itojun 563: /* XXX do we need more sanity checks? */
564: ours = 1;
1.105 dyoung 565: deliverifp = rt->rt_ifp; /* faith */
1.9 itojun 566: goto hbhcheck;
567: }
568: }
569: #endif
570:
571: #if 0
572: {
573: /*
574: * Last resort: check in6_ifaddr for incoming interface.
575: * The code is here until I update the "goto ours hack" code above
576: * working right.
577: */
578: struct ifaddr *ifa;
1.113 dyoung 579: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9 itojun 580: if (ifa->ifa_addr == NULL)
581: continue; /* just for safety */
582: if (ifa->ifa_addr->sa_family != AF_INET6)
583: continue;
584: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
585: ours = 1;
586: deliverifp = ifa->ifa_ifp;
1.2 itojun 587: goto hbhcheck;
588: }
589: }
1.9 itojun 590: }
1.2 itojun 591: #endif
592:
593: /*
594: * Now there is no reason to process the packet if it's not our own
595: * and we're not a router.
596: */
597: if (!ip6_forwarding) {
1.116 thorpej 598: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9 itojun 599: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 600: goto bad;
601: }
602:
603: hbhcheck:
604: /*
1.81 rpaulo 605: * record address information into m_tag, if we don't have one yet.
606: * note that we are unable to record it, if the address is not listed
607: * as our interface address (e.g. multicast addresses, addresses
608: * within FAITH prefixes and such).
609: */
1.111 dyoung 610: if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81 rpaulo 611: struct in6_ifaddr *ia6;
612:
613: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111 dyoung 614: if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
615: /*
616: * XXX maybe we should drop the packet here,
617: * as we could not provide enough information
618: * to the upper layers.
619: */
1.81 rpaulo 620: }
621: }
622:
623: /*
1.2 itojun 624: * Process Hop-by-Hop options header if it's contained.
625: * m may be modified in ip6_hopopts_input().
626: * If a JumboPayload option is included, plen will also be modified.
627: */
628: plen = (u_int32_t)ntohs(ip6->ip6_plen);
629: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 630: struct ip6_hbh *hbh;
631:
632: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
633: #if 0 /*touches NULL pointer*/
634: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
635: #endif
1.2 itojun 636: return; /* m have already been freed */
1.9 itojun 637: }
1.22 itojun 638:
1.2 itojun 639: /* adjust pointer */
640: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 641:
642: /*
1.49 itojun 643: * if the payload length field is 0 and the next header field
1.22 itojun 644: * indicates Hop-by-Hop Options header, then a Jumbo Payload
645: * option MUST be included.
646: */
647: if (ip6->ip6_plen == 0 && plen == 0) {
648: /*
649: * Note that if a valid jumbo payload option is
1.83 rpaulo 650: * contained, ip6_hopopts_input() must set a valid
1.55 itojun 651: * (non-zero) payload length to the variable plen.
1.22 itojun 652: */
1.116 thorpej 653: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 654: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
655: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
656: icmp6_error(m, ICMP6_PARAM_PROB,
657: ICMP6_PARAMPROB_HEADER,
1.97 christos 658: (char *)&ip6->ip6_plen - (char *)ip6);
1.22 itojun 659: return;
660: }
1.9 itojun 661: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
662: sizeof(struct ip6_hbh));
663: if (hbh == NULL) {
1.116 thorpej 664: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 665: return;
666: }
1.57 thorpej 667: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 668: nxt = hbh->ip6h_nxt;
1.2 itojun 669:
670: /*
671: * accept the packet if a router alert option is included
672: * and we act as an IPv6 router.
673: */
1.5 itojun 674: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 675: ours = 1;
676: } else
677: nxt = ip6->ip6_nxt;
678:
679: /*
680: * Check that the amount of data in the buffers
681: * is as at least much as the IPv6 header would have us expect.
682: * Trim mbufs if longer than we expect.
683: * Drop packet if shorter than we expect.
684: */
685: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116 thorpej 686: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 687: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 688: goto bad;
689: }
690: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
691: if (m->m_len == m->m_pkthdr.len) {
692: m->m_len = sizeof(struct ip6_hdr) + plen;
693: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
694: } else
695: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
696: }
697:
698: /*
699: * Forward if desirable.
700: */
701: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
702: /*
703: * If we are acting as a multicast router, all
704: * incoming multicast packets are passed to the
705: * kernel-level multicast forwarding function.
706: * The packet is returned (relatively) intact; if
707: * ip6_mforward() returns a non-zero value, the packet
708: * must be discarded, else it may be accepted below.
709: */
710: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116 thorpej 711: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2 itojun 712: m_freem(m);
713: return;
714: }
715: if (!ours) {
716: m_freem(m);
717: return;
718: }
1.22 itojun 719: } else if (!ours) {
1.64 itojun 720: ip6_forward(m, srcrt);
1.2 itojun 721: return;
1.56 itojun 722: }
1.25 itojun 723:
724: ip6 = mtod(m, struct ip6_hdr *);
725:
726: /*
727: * Malicious party may be able to use IPv4 mapped addr to confuse
728: * tcp/udp stack and bypass security checks (act as if it was from
729: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
730: *
731: * For SIIT end node behavior, you may want to disable the check.
732: * However, you will become vulnerable to attacks using IPv4 mapped
733: * source.
734: */
735: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
736: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 737: IP6_STATINC(IP6_STAT_BADSCOPE);
1.25 itojun 738: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
739: goto bad;
740: }
1.2 itojun 741:
742: /*
743: * Tell launch routine the next header
744: */
1.12 itojun 745: #ifdef IFA_STATS
1.28 itojun 746: if (deliverifp != NULL) {
1.9 itojun 747: struct in6_ifaddr *ia6;
748: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
749: if (ia6)
750: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
751: }
752: #endif
1.116 thorpej 753: IP6_STATINC(IP6_STAT_DELIVERED);
1.9 itojun 754: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 755: nest = 0;
1.40 itojun 756:
1.104 yamt 757: rh_present = 0;
1.2 itojun 758: while (nxt != IPPROTO_DONE) {
759: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116 thorpej 760: IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104 yamt 761: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 762: goto bad;
763: }
1.8 itojun 764:
765: /*
766: * protection against faulty packet - there should be
767: * more sanity checks in header chain processing.
768: */
769: if (m->m_pkthdr.len < off) {
1.116 thorpej 770: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 771: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 772: goto bad;
773: }
774:
1.104 yamt 775: if (nxt == IPPROTO_ROUTING) {
776: if (rh_present++) {
777: in6_ifstat_inc(m->m_pkthdr.rcvif,
778: ifs6_in_hdrerr);
1.116 thorpej 779: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104 yamt 780: goto bad;
781: }
782: }
783:
1.37 itojun 784: #ifdef IPSEC
785: /*
786: * enforce IPsec policy checking if we are seeing last header.
787: * note that we do not visit this with protocols with pcb layer
788: * code - like udp/tcp/raw ip.
789: */
790: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
791: ipsec6_in_reject(m, NULL)) {
1.117 thorpej 792: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37 itojun 793: goto bad;
794: }
795: #endif
1.94 degroote 796: #ifdef FAST_IPSEC
797: /*
798: * enforce IPsec policy checking if we are seeing last header.
799: * note that we do not visit this with protocols with pcb layer
800: * code - like udp/tcp/raw ip.
801: */
802: if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
803: /*
804: * Check if the packet has already had IPsec processing
805: * done. If so, then just pass it along. This tag gets
806: * set during AH, ESP, etc. input handling, before the
807: * packet is returned to the ip input queue for delivery.
808: */
809: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
810: s = splsoftnet();
811: if (mtag != NULL) {
812: tdbi = (struct tdb_ident *)(mtag + 1);
813: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
814: } else {
815: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
816: IP_FORWARDING, &error);
817: }
818: if (sp != NULL) {
819: /*
820: * Check security policy against packet attributes.
821: */
822: error = ipsec_in_reject(sp, m);
823: KEY_FREESP(&sp);
824: } else {
825: /* XXX error stat??? */
826: error = EINVAL;
827: DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
828: }
829: splx(s);
830: if (error)
831: goto bad;
832: }
833: #endif /* FAST_IPSEC */
834:
1.56 itojun 835:
1.2 itojun 836: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
837: }
838: return;
839: bad:
840: m_freem(m);
841: }
842:
843: /*
1.81 rpaulo 844: * set/grab in6_ifaddr correspond to IPv6 destination address.
845: */
846: static struct m_tag *
1.112 dyoung 847: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81 rpaulo 848: {
849: struct m_tag *mtag;
850:
851: mtag = ip6_addaux(m);
1.112 dyoung 852: if (mtag != NULL) {
853: struct ip6aux *ip6a;
854:
855: ip6a = (struct ip6aux *)(mtag + 1);
856: in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
857: ip6a->ip6a_src = ia->ia_addr.sin6_addr;
858: ip6a->ip6a_flags = ia->ia6_flags;
859: }
1.81 rpaulo 860: return mtag; /* NULL if failed to set */
861: }
862:
1.112 dyoung 863: const struct ip6aux *
1.107 christos 864: ip6_getdstifaddr(struct mbuf *m)
1.81 rpaulo 865: {
866: struct m_tag *mtag;
867:
868: mtag = ip6_findaux(m);
1.112 dyoung 869: if (mtag != NULL)
870: return (struct ip6aux *)(mtag + 1);
1.81 rpaulo 871: else
872: return NULL;
873: }
874:
875: /*
1.2 itojun 876: * Hop-by-Hop options header processing. If a valid jumbo payload option is
877: * included, the real payload length will be stored in plenp.
1.107 christos 878: *
879: * rtalertp - XXX: should be stored more smart way
1.2 itojun 880: */
881: static int
1.107 christos 882: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
883: struct mbuf **mp, int *offp)
1.2 itojun 884: {
1.35 itojun 885: struct mbuf *m = *mp;
1.2 itojun 886: int off = *offp, hbhlen;
887: struct ip6_hbh *hbh;
888:
889: /* validation of the length of the header */
1.9 itojun 890: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
891: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
892: if (hbh == NULL) {
1.116 thorpej 893: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 894: return -1;
895: }
896: hbhlen = (hbh->ip6h_len + 1) << 3;
897: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
898: hbhlen);
899: if (hbh == NULL) {
1.116 thorpej 900: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 901: return -1;
902: }
1.57 thorpej 903: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 904: off += hbhlen;
905: hbhlen -= sizeof(struct ip6_hbh);
906:
907: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
908: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 909: return (-1);
1.2 itojun 910:
911: *offp = off;
912: *mp = m;
1.58 itojun 913: return (0);
1.2 itojun 914: }
915:
916: /*
917: * Search header for all Hop-by-hop options and process each option.
918: * This function is separate from ip6_hopopts_input() in order to
919: * handle a case where the sending node itself process its hop-by-hop
920: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 921: *
922: * The function assumes that hbh header is located right after the IPv6 header
923: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
924: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 925: */
926: int
1.107 christos 927: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
928: u_int32_t *rtalertp, u_int32_t *plenp)
1.2 itojun 929: {
930: struct ip6_hdr *ip6;
931: int optlen = 0;
932: u_int8_t *opt = opthead;
933: u_int16_t rtalert_val;
1.22 itojun 934: u_int32_t jumboplen;
1.55 itojun 935: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 936:
937: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 938: switch (*opt) {
939: case IP6OPT_PAD1:
940: optlen = 1;
941: break;
942: case IP6OPT_PADN:
943: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 944: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 945: goto bad;
946: }
947: optlen = *(opt + 1) + 2;
948: break;
949: case IP6OPT_RTALERT:
950: /* XXX may need check for alignment */
951: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116 thorpej 952: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 953: goto bad;
954: }
955: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 956: /* XXX stat */
957: icmp6_error(m, ICMP6_PARAM_PROB,
958: ICMP6_PARAMPROB_HEADER,
959: erroff + opt + 1 - opthead);
960: return (-1);
1.35 itojun 961: }
962: optlen = IP6OPT_RTALERT_LEN;
1.126 ! tsutsui 963: memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35 itojun 964: *rtalertp = ntohs(rtalert_val);
965: break;
966: case IP6OPT_JUMBO:
1.22 itojun 967: /* XXX may need check for alignment */
968: if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116 thorpej 969: IP6_STATINC(IP6_STAT_TOOSMALL);
1.22 itojun 970: goto bad;
971: }
1.35 itojun 972: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 973: /* XXX stat */
974: icmp6_error(m, ICMP6_PARAM_PROB,
975: ICMP6_PARAMPROB_HEADER,
976: erroff + opt + 1 - opthead);
977: return (-1);
1.35 itojun 978: }
1.22 itojun 979: optlen = IP6OPT_JUMBO_LEN;
980:
981: /*
982: * IPv6 packets that have non 0 payload length
1.35 itojun 983: * must not contain a jumbo payload option.
1.22 itojun 984: */
985: ip6 = mtod(m, struct ip6_hdr *);
986: if (ip6->ip6_plen) {
1.116 thorpej 987: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 988: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 989: ICMP6_PARAMPROB_HEADER,
990: erroff + opt - opthead);
991: return (-1);
1.22 itojun 992: }
1.2 itojun 993:
1.22 itojun 994: /*
995: * We may see jumbolen in unaligned location, so
996: * we'd need to perform bcopy().
997: */
1.126 ! tsutsui 998: memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22 itojun 999: jumboplen = (u_int32_t)htonl(jumboplen);
1000:
1001: #if 1
1002: /*
1003: * if there are multiple jumbo payload options,
1004: * *plenp will be non-zero and the packet will be
1005: * rejected.
1006: * the behavior may need some debate in ipngwg -
1007: * multiple options does not make sense, however,
1008: * there's no explicit mention in specification.
1009: */
1010: if (*plenp != 0) {
1.116 thorpej 1011: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1012: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1013: ICMP6_PARAMPROB_HEADER,
1014: erroff + opt + 2 - opthead);
1015: return (-1);
1.22 itojun 1016: }
1.8 itojun 1017: #endif
1.2 itojun 1018:
1.22 itojun 1019: /*
1020: * jumbo payload length must be larger than 65535.
1021: */
1022: if (jumboplen <= IPV6_MAXPACKET) {
1.116 thorpej 1023: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1024: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1025: ICMP6_PARAMPROB_HEADER,
1026: erroff + opt + 2 - opthead);
1027: return (-1);
1.22 itojun 1028: }
1029: *plenp = jumboplen;
1030:
1031: break;
1.35 itojun 1032: default: /* unknown option */
1033: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 1034: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 1035: goto bad;
1036: }
1.55 itojun 1037: optlen = ip6_unknown_opt(opt, m,
1038: erroff + opt - opthead);
1039: if (optlen == -1)
1040: return (-1);
1.35 itojun 1041: optlen += 2;
1042: break;
1.2 itojun 1043: }
1044: }
1045:
1.55 itojun 1046: return (0);
1.2 itojun 1047:
1048: bad:
1049: m_freem(m);
1.55 itojun 1050: return (-1);
1.2 itojun 1051: }
1052:
1053: /*
1054: * Unknown option processing.
1055: * The third argument `off' is the offset from the IPv6 header to the option,
1056: * which is necessary if the IPv6 header the and option header and IPv6 header
1057: * is not continuous in order to return an ICMPv6 error.
1058: */
1059: int
1.107 christos 1060: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2 itojun 1061: {
1062: struct ip6_hdr *ip6;
1063:
1.35 itojun 1064: switch (IP6OPT_TYPE(*optp)) {
1065: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 1066: return ((int)*(optp + 1));
1.35 itojun 1067: case IP6OPT_TYPE_DISCARD: /* silently discard */
1068: m_freem(m);
1.58 itojun 1069: return (-1);
1.35 itojun 1070: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116 thorpej 1071: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1072: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1073: return (-1);
1.35 itojun 1074: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116 thorpej 1075: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1076: ip6 = mtod(m, struct ip6_hdr *);
1077: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1078: (m->m_flags & (M_BCAST|M_MCAST)))
1079: m_freem(m);
1080: else
1081: icmp6_error(m, ICMP6_PARAM_PROB,
1082: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1083: return (-1);
1.2 itojun 1084: }
1085:
1086: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 1087: return (-1);
1.2 itojun 1088: }
1089:
1090: /*
1.9 itojun 1091: * Create the "control" list for this pcb.
1092: *
1093: * The routine will be called from upper layer handlers like tcp6_input().
1094: * Thus the routine assumes that the caller (tcp6_input) have already
1095: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1096: * very first mbuf on the mbuf chain.
1097: * We may want to add some infinite loop prevention or sanity checks for safety.
1098: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1099: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1100: */
1101: void
1.107 christos 1102: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1103: struct ip6_hdr *ip6, struct mbuf *m)
1.2 itojun 1104: {
1.85 rpaulo 1105: #ifdef RFC2292
1106: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1107: #else
1108: #define IS2292(x, y) (y)
1109: #endif
1110:
1.123 christos 1111: if (in6p->in6p_socket->so_options & SO_TIMESTAMP
1112: #ifdef SO_OTIMESTAMP
1113: || in6p->in6p_socket->so_options & SO_OTIMESTAMP
1114: #endif
1115: ) {
1.2 itojun 1116: struct timeval tv;
1117:
1118: microtime(&tv);
1.123 christos 1119: #ifdef SO_OTIMESTAMP
1120: if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
1121: struct timeval50 tv50;
1122: timeval_to_timeval50(&tv, &tv50);
1123: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1124: SCM_OTIMESTAMP, SOL_SOCKET);
1125: } else
1126: #endif
1.97 christos 1127: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63 itojun 1128: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1129: if (*mp)
1130: mp = &(*mp)->m_next;
1131: }
1.87 rpaulo 1132:
1133: /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1134: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1135: return;
1136:
1.2 itojun 1137: /* RFC 2292 sec. 5 */
1.35 itojun 1138: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1139: struct in6_pktinfo pi6;
1.85 rpaulo 1140:
1.126 ! tsutsui 1141: memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81 rpaulo 1142: in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84 christos 1143: pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1144: m->m_pkthdr.rcvif->if_index : 0;
1.97 christos 1145: *mp = sbcreatecontrol((void *) &pi6,
1.85 rpaulo 1146: sizeof(struct in6_pktinfo),
1147: IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2 itojun 1148: if (*mp)
1149: mp = &(*mp)->m_next;
1150: }
1.85 rpaulo 1151:
1.2 itojun 1152: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1153: int hlim = ip6->ip6_hlim & 0xff;
1.85 rpaulo 1154:
1.97 christos 1155: *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85 rpaulo 1156: IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1157: if (*mp)
1158: mp = &(*mp)->m_next;
1159: }
1160:
1161: if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1162: u_int32_t flowinfo;
1163: int tclass;
1164:
1165: flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1166: flowinfo >>= 20;
1167:
1168: tclass = flowinfo & 0xff;
1.97 christos 1169: *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85 rpaulo 1170: IPV6_TCLASS, IPPROTO_IPV6);
1171:
1.2 itojun 1172: if (*mp)
1173: mp = &(*mp)->m_next;
1174: }
1175:
1176: /*
1.75 itojun 1177: * IPV6_HOPOPTS socket option. Recall that we required super-user
1178: * privilege for the option (see ip6_ctloutput), but it might be too
1179: * strict, since there might be some hop-by-hop options which can be
1180: * returned to normal user.
1.85 rpaulo 1181: * See also RFC3542 section 8 (or RFC2292 section 6).
1.2 itojun 1182: */
1.75 itojun 1183: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2 itojun 1184: /*
1185: * Check if a hop-by-hop options header is contatined in the
1186: * received packet, and if so, store the options as ancillary
1187: * data. Note that a hop-by-hop options header must be
1188: * just after the IPv6 header, which fact is assured through
1189: * the IPv6 input processing.
1190: */
1.78 christos 1191: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1192: if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1193: struct ip6_hbh *hbh;
1194: int hbhlen;
1.62 itojun 1195: struct mbuf *ext;
1.9 itojun 1196:
1.62 itojun 1197: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78 christos 1198: xip6->ip6_nxt);
1.62 itojun 1199: if (ext == NULL) {
1.116 thorpej 1200: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1201: return;
1202: }
1.62 itojun 1203: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1204: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1205: if (hbhlen != ext->m_len) {
1206: m_freem(ext);
1.116 thorpej 1207: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1208: return;
1209: }
1.2 itojun 1210:
1211: /*
1212: * XXX: We copy whole the header even if a jumbo
1213: * payload option is included, which option is to
1214: * be removed before returning in the RFC 2292.
1.85 rpaulo 1215: * Note: this constraint is removed in RFC3542.
1.2 itojun 1216: */
1.97 christos 1217: *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85 rpaulo 1218: IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1219: IPPROTO_IPV6);
1.2 itojun 1220: if (*mp)
1221: mp = &(*mp)->m_next;
1.62 itojun 1222: m_freem(ext);
1.2 itojun 1223: }
1224: }
1225:
1226: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1227: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78 christos 1228: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1229: int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1230:
1231: /*
1232: * Search for destination options headers or routing
1233: * header(s) through the header chain, and stores each
1234: * header as ancillary data.
1235: * Note that the order of the headers remains in
1236: * the chain of ancillary data.
1237: */
1.86 rpaulo 1238: for (;;) { /* is explicit loop prevention necessary? */
1.62 itojun 1239: struct ip6_ext *ip6e = NULL;
1.9 itojun 1240: int elen;
1.62 itojun 1241: struct mbuf *ext = NULL;
1.9 itojun 1242:
1.62 itojun 1243: /*
1244: * if it is not an extension header, don't try to
1245: * pull it from the chain.
1246: */
1247: switch (nxt) {
1248: case IPPROTO_DSTOPTS:
1249: case IPPROTO_ROUTING:
1250: case IPPROTO_HOPOPTS:
1251: case IPPROTO_AH: /* is it possible? */
1252: break;
1253: default:
1254: goto loopend;
1255: }
1256:
1257: ext = ip6_pullexthdr(m, off, nxt);
1258: if (ext == NULL) {
1.116 thorpej 1259: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1260: return;
1261: }
1.62 itojun 1262: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1263: if (nxt == IPPROTO_AH)
1264: elen = (ip6e->ip6e_len + 2) << 2;
1265: else
1266: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1267: if (elen != ext->m_len) {
1268: m_freem(ext);
1.116 thorpej 1269: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1270: return;
1271: }
1.57 thorpej 1272: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1273:
1.35 itojun 1274: switch (nxt) {
1.62 itojun 1275: case IPPROTO_DSTOPTS:
1.35 itojun 1276: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1277: break;
1278:
1.97 christos 1279: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1280: IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1281: IPPROTO_IPV6);
1.35 itojun 1282: if (*mp)
1283: mp = &(*mp)->m_next;
1284: break;
1285:
1286: case IPPROTO_ROUTING:
1287: if (!in6p->in6p_flags & IN6P_RTHDR)
1288: break;
1289:
1.97 christos 1290: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1291: IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1292: IPPROTO_IPV6);
1.35 itojun 1293: if (*mp)
1294: mp = &(*mp)->m_next;
1295: break;
1296:
1.62 itojun 1297: case IPPROTO_HOPOPTS:
1298: case IPPROTO_AH: /* is it possible? */
1299: break;
1300:
1.35 itojun 1301: default:
1302: /*
1.62 itojun 1303: * other cases have been filtered in the above.
1304: * none will visit this case. here we supply
1305: * the code just in case (nxt overwritten or
1306: * other cases).
1.35 itojun 1307: */
1.62 itojun 1308: m_freem(ext);
1.35 itojun 1309: goto loopend;
1310:
1.2 itojun 1311: }
1312:
1313: /* proceed with the next header. */
1.9 itojun 1314: off += elen;
1.2 itojun 1315: nxt = ip6e->ip6e_nxt;
1.62 itojun 1316: ip6e = NULL;
1317: m_freem(ext);
1318: ext = NULL;
1.2 itojun 1319: }
1320: loopend:
1.62 itojun 1321: ;
1.2 itojun 1322: }
1.62 itojun 1323: }
1.85 rpaulo 1324: #undef IS2292
1325:
1326:
1327: void
1.95 dyoung 1328: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1329: uint32_t *mtu)
1.85 rpaulo 1330: {
1331: struct socket *so;
1332: struct mbuf *m_mtu;
1333: struct ip6_mtuinfo mtuctl;
1334:
1335: so = in6p->in6p_socket;
1336:
1337: if (mtu == NULL)
1338: return;
1339:
1340: #ifdef DIAGNOSTIC
1341: if (so == NULL) /* I believe this is impossible */
1342: panic("ip6_notify_pmtu: socket is NULL");
1343: #endif
1344:
1345: memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1346: mtuctl.ip6m_mtu = *mtu;
1347: mtuctl.ip6m_addr = *dst;
1348: if (sa6_recoverscope(&mtuctl.ip6m_addr))
1349: return;
1350:
1.97 christos 1351: if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85 rpaulo 1352: IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1353: return;
1354:
1.95 dyoung 1355: if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85 rpaulo 1356: == 0) {
1357: m_freem(m_mtu);
1358: /* XXX: should count statistics */
1359: } else
1360: sorwakeup(so);
1361:
1362: return;
1363: }
1.62 itojun 1364:
1365: /*
1366: * pull single extension header from mbuf chain. returns single mbuf that
1367: * contains the result, or NULL on error.
1368: */
1369: static struct mbuf *
1.107 christos 1370: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62 itojun 1371: {
1372: struct ip6_ext ip6e;
1373: size_t elen;
1374: struct mbuf *n;
1375:
1376: #ifdef DIAGNOSTIC
1377: switch (nxt) {
1378: case IPPROTO_DSTOPTS:
1379: case IPPROTO_ROUTING:
1380: case IPPROTO_HOPOPTS:
1381: case IPPROTO_AH: /* is it possible? */
1382: break;
1383: default:
1384: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1385: }
1.62 itojun 1386: #endif
1.2 itojun 1387:
1.97 christos 1388: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62 itojun 1389: if (nxt == IPPROTO_AH)
1390: elen = (ip6e.ip6e_len + 2) << 2;
1391: else
1392: elen = (ip6e.ip6e_len + 1) << 3;
1393:
1394: MGET(n, M_DONTWAIT, MT_DATA);
1395: if (n && elen >= MLEN) {
1396: MCLGET(n, M_DONTWAIT);
1397: if ((n->m_flags & M_EXT) == 0) {
1398: m_free(n);
1399: n = NULL;
1400: }
1401: }
1402: if (!n)
1403: return NULL;
1404:
1405: n->m_len = 0;
1406: if (elen >= M_TRAILINGSPACE(n)) {
1407: m_free(n);
1408: return NULL;
1409: }
1410:
1.97 christos 1411: m_copydata(m, off, elen, mtod(n, void *));
1.62 itojun 1412: n->m_len = elen;
1413: return n;
1.2 itojun 1414: }
1415:
1416: /*
1417: * Get pointer to the previous header followed by the header
1418: * currently processed.
1419: * XXX: This function supposes that
1420: * M includes all headers,
1421: * the next header field and the header length field of each header
1422: * are valid, and
1423: * the sum of each header length equals to OFF.
1424: * Because of these assumptions, this function must be called very
1425: * carefully. Moreover, it will not be used in the near future when
1426: * we develop `neater' mechanism to process extension headers.
1427: */
1.58 itojun 1428: u_int8_t *
1.107 christos 1429: ip6_get_prevhdr(struct mbuf *m, int off)
1.2 itojun 1430: {
1431: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1432:
1433: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1434: return (&ip6->ip6_nxt);
1.2 itojun 1435: else {
1436: int len, nxt;
1437: struct ip6_ext *ip6e = NULL;
1438:
1439: nxt = ip6->ip6_nxt;
1440: len = sizeof(struct ip6_hdr);
1441: while (len < off) {
1.97 christos 1442: ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2 itojun 1443:
1.35 itojun 1444: switch (nxt) {
1.2 itojun 1445: case IPPROTO_FRAGMENT:
1446: len += sizeof(struct ip6_frag);
1447: break;
1448: case IPPROTO_AH:
1449: len += (ip6e->ip6e_len + 2) << 2;
1450: break;
1451: default:
1452: len += (ip6e->ip6e_len + 1) << 3;
1453: break;
1454: }
1455: nxt = ip6e->ip6e_nxt;
1456: }
1457: if (ip6e)
1.58 itojun 1458: return (&ip6e->ip6e_nxt);
1.2 itojun 1459: else
1460: return NULL;
1.18 itojun 1461: }
1462: }
1463:
1464: /*
1465: * get next header offset. m will be retained.
1466: */
1467: int
1.107 christos 1468: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1469: {
1470: struct ip6_hdr ip6;
1471: struct ip6_ext ip6e;
1472: struct ip6_frag fh;
1473:
1474: /* just in case */
1475: if (m == NULL)
1476: panic("ip6_nexthdr: m == NULL");
1477: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1478: return -1;
1479:
1480: switch (proto) {
1481: case IPPROTO_IPV6:
1.83 rpaulo 1482: /* do not chase beyond intermediate IPv6 headers */
1483: if (off != 0)
1484: return -1;
1.18 itojun 1485: if (m->m_pkthdr.len < off + sizeof(ip6))
1486: return -1;
1.97 christos 1487: m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18 itojun 1488: if (nxtp)
1489: *nxtp = ip6.ip6_nxt;
1490: off += sizeof(ip6);
1491: return off;
1492:
1493: case IPPROTO_FRAGMENT:
1494: /*
1495: * terminate parsing if it is not the first fragment,
1496: * it does not make sense to parse through it.
1497: */
1498: if (m->m_pkthdr.len < off + sizeof(fh))
1499: return -1;
1.97 christos 1500: m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67 itojun 1501: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1502: return -1;
1503: if (nxtp)
1504: *nxtp = fh.ip6f_nxt;
1505: off += sizeof(struct ip6_frag);
1506: return off;
1507:
1508: case IPPROTO_AH:
1509: if (m->m_pkthdr.len < off + sizeof(ip6e))
1510: return -1;
1.97 christos 1511: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1512: if (nxtp)
1513: *nxtp = ip6e.ip6e_nxt;
1514: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1515: if (m->m_pkthdr.len < off)
1516: return -1;
1.18 itojun 1517: return off;
1518:
1519: case IPPROTO_HOPOPTS:
1520: case IPPROTO_ROUTING:
1521: case IPPROTO_DSTOPTS:
1522: if (m->m_pkthdr.len < off + sizeof(ip6e))
1523: return -1;
1.97 christos 1524: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1525: if (nxtp)
1526: *nxtp = ip6e.ip6e_nxt;
1527: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1528: if (m->m_pkthdr.len < off)
1529: return -1;
1.18 itojun 1530: return off;
1531:
1532: case IPPROTO_NONE:
1533: case IPPROTO_ESP:
1534: case IPPROTO_IPCOMP:
1535: /* give up */
1536: return -1;
1537:
1538: default:
1539: return -1;
1540: }
1541: }
1542:
1543: /*
1544: * get offset for the last header in the chain. m will be kept untainted.
1545: */
1546: int
1.107 christos 1547: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1548: {
1549: int newoff;
1550: int nxt;
1551:
1552: if (!nxtp) {
1553: nxt = -1;
1554: nxtp = &nxt;
1555: }
1.86 rpaulo 1556: for (;;) {
1.18 itojun 1557: newoff = ip6_nexthdr(m, off, proto, nxtp);
1558: if (newoff < 0)
1559: return off;
1560: else if (newoff < off)
1561: return -1; /* invalid */
1562: else if (newoff == off)
1563: return newoff;
1564:
1565: off = newoff;
1566: proto = *nxtp;
1.2 itojun 1567: }
1568: }
1569:
1.81 rpaulo 1570: struct m_tag *
1.107 christos 1571: ip6_addaux(struct mbuf *m)
1.81 rpaulo 1572: {
1573: struct m_tag *mtag;
1574:
1575: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1576: if (!mtag) {
1577: mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1578: M_NOWAIT);
1579: if (mtag) {
1580: m_tag_prepend(m, mtag);
1.124 cegger 1581: memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81 rpaulo 1582: }
1583: }
1584: return mtag;
1585: }
1586:
1587: struct m_tag *
1.107 christos 1588: ip6_findaux(struct mbuf *m)
1.81 rpaulo 1589: {
1590: struct m_tag *mtag;
1591:
1592: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1593: return mtag;
1594: }
1595:
1596: void
1.107 christos 1597: ip6_delaux(struct mbuf *m)
1.81 rpaulo 1598: {
1599: struct m_tag *mtag;
1600:
1601: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1602: if (mtag)
1603: m_tag_delete(m, mtag);
1604: }
1605:
1.98 liamjfoy 1606: #ifdef GATEWAY
1607: /*
1608: * sysctl helper routine for net.inet.ip6.maxflows. Since
1609: * we could reduce this value, call ip6flow_reap();
1610: */
1611: static int
1.101 liamjfoy 1612: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98 liamjfoy 1613: {
1.121 simonb 1614: int error;
1.98 liamjfoy 1615:
1.121 simonb 1616: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1617: if (error || newp == NULL)
1618: return (error);
1.98 liamjfoy 1619:
1.121 simonb 1620: mutex_enter(softnet_lock);
1.122 matt 1621: KERNEL_LOCK(1, NULL);
1.120 matt 1622:
1.121 simonb 1623: ip6flow_reap(0);
1.120 matt 1624:
1625: KERNEL_UNLOCK_ONE(NULL);
1.121 simonb 1626: mutex_exit(softnet_lock);
1.98 liamjfoy 1627:
1.121 simonb 1628: return (0);
1.98 liamjfoy 1629: }
1.99 liamjfoy 1630:
1631: static int
1632: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1633: {
1634: int error, tmp;
1635: struct sysctlnode node;
1636:
1637: node = *rnode;
1638: tmp = ip6_hashsize;
1639: node.sysctl_data = &tmp;
1640: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1641: if (error || newp == NULL)
1642: return (error);
1643:
1644: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1645: /*
1646: * Can only fail due to malloc()
1647: */
1.120 matt 1648: mutex_enter(softnet_lock);
1.122 matt 1649: KERNEL_LOCK(1, NULL);
1.120 matt 1650:
1651: error = ip6flow_invalidate_all(tmp);
1652:
1653: KERNEL_UNLOCK_ONE(NULL);
1654: mutex_exit(softnet_lock);
1.99 liamjfoy 1655: } else {
1656: /*
1657: * EINVAL if not a power of 2
1.121 simonb 1658: */
1.120 matt 1659: error = EINVAL;
1.99 liamjfoy 1660: }
1661:
1.120 matt 1662: return error;
1.99 liamjfoy 1663: }
1.98 liamjfoy 1664: #endif /* GATEWAY */
1665:
1.2 itojun 1666: /*
1667: * System control for IP6
1668: */
1669:
1.120 matt 1670: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2 itojun 1671: 0, 0, 0, 0,
1672: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1673: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1674: EMSGSIZE, EHOSTUNREACH, 0, 0,
1675: 0, 0, 0, 0,
1676: ENOPROTOOPT
1677: };
1678:
1.116 thorpej 1679: static int
1680: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1681: {
1682:
1.119 thorpej 1683: return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116 thorpej 1684: }
1685:
1.70 atatat 1686: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2 itojun 1687: {
1.85 rpaulo 1688: #ifdef RFC2292
1689: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1690: #else
1691: #define IS2292(x, y) (y)
1692: #endif
1.26 itojun 1693:
1.73 atatat 1694: sysctl_createv(clog, 0, NULL, NULL,
1695: CTLFLAG_PERMANENT,
1.70 atatat 1696: CTLTYPE_NODE, "net", NULL,
1697: NULL, 0, NULL, 0,
1698: CTL_NET, CTL_EOL);
1.73 atatat 1699: sysctl_createv(clog, 0, NULL, NULL,
1700: CTLFLAG_PERMANENT,
1.74 atatat 1701: CTLTYPE_NODE, "inet6",
1702: SYSCTL_DESCR("PF_INET6 related settings"),
1.70 atatat 1703: NULL, 0, NULL, 0,
1704: CTL_NET, PF_INET6, CTL_EOL);
1.73 atatat 1705: sysctl_createv(clog, 0, NULL, NULL,
1706: CTLFLAG_PERMANENT,
1.74 atatat 1707: CTLTYPE_NODE, "ip6",
1708: SYSCTL_DESCR("IPv6 related settings"),
1.70 atatat 1709: NULL, 0, NULL, 0,
1710: CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1711:
1.73 atatat 1712: sysctl_createv(clog, 0, NULL, NULL,
1713: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1714: CTLTYPE_INT, "forwarding",
1715: SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70 atatat 1716: NULL, 0, &ip6_forwarding, 0,
1717: CTL_NET, PF_INET6, IPPROTO_IPV6,
1718: IPV6CTL_FORWARDING, CTL_EOL);
1.73 atatat 1719: sysctl_createv(clog, 0, NULL, NULL,
1720: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1721: CTLTYPE_INT, "redirect",
1722: SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70 atatat 1723: NULL, 0, &ip6_sendredirects, 0,
1724: CTL_NET, PF_INET6, IPPROTO_IPV6,
1725: IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73 atatat 1726: sysctl_createv(clog, 0, NULL, NULL,
1727: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1728: CTLTYPE_INT, "hlim",
1729: SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70 atatat 1730: NULL, 0, &ip6_defhlim, 0,
1731: CTL_NET, PF_INET6, IPPROTO_IPV6,
1732: IPV6CTL_DEFHLIM, CTL_EOL);
1733: #ifdef notyet
1.73 atatat 1734: sysctl_createv(clog, 0, NULL, NULL,
1735: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1736: CTLTYPE_INT, "mtu", NULL,
1737: NULL, 0, &, 0,
1738: CTL_NET, PF_INET6, IPPROTO_IPV6,
1739: IPV6CTL_DEFMTU, CTL_EOL);
1740: #endif
1741: #ifdef __no_idea__
1.73 atatat 1742: sysctl_createv(clog, 0, NULL, NULL,
1743: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1744: CTLTYPE_INT, "forwsrcrt", NULL,
1745: NULL, 0, &?, 0,
1746: CTL_NET, PF_INET6, IPPROTO_IPV6,
1747: IPV6CTL_FORWSRCRT, CTL_EOL);
1.73 atatat 1748: sysctl_createv(clog, 0, NULL, NULL,
1749: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1750: CTLTYPE_STRUCT, "mrtstats", NULL,
1751: NULL, 0, &?, sizeof(?),
1752: CTL_NET, PF_INET6, IPPROTO_IPV6,
1753: IPV6CTL_MRTSTATS, CTL_EOL);
1.73 atatat 1754: sysctl_createv(clog, 0, NULL, NULL,
1755: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1756: CTLTYPE_?, "mrtproto", NULL,
1757: NULL, 0, &?, sizeof(?),
1758: CTL_NET, PF_INET6, IPPROTO_IPV6,
1759: IPV6CTL_MRTPROTO, CTL_EOL);
1760: #endif
1.73 atatat 1761: sysctl_createv(clog, 0, NULL, NULL,
1762: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1763: CTLTYPE_INT, "maxfragpackets",
1764: SYSCTL_DESCR("Maximum number of fragments to buffer "
1765: "for reassembly"),
1.70 atatat 1766: NULL, 0, &ip6_maxfragpackets, 0,
1767: CTL_NET, PF_INET6, IPPROTO_IPV6,
1768: IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1769: #ifdef __no_idea__
1.73 atatat 1770: sysctl_createv(clog, 0, NULL, NULL,
1771: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1772: CTLTYPE_INT, "sourcecheck", NULL,
1773: NULL, 0, &?, 0,
1774: CTL_NET, PF_INET6, IPPROTO_IPV6,
1775: IPV6CTL_SOURCECHECK, CTL_EOL);
1.73 atatat 1776: sysctl_createv(clog, 0, NULL, NULL,
1777: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1778: CTLTYPE_INT, "sourcecheck_logint", NULL,
1779: NULL, 0, &?, 0,
1780: CTL_NET, PF_INET6, IPPROTO_IPV6,
1781: IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1782: #endif
1.73 atatat 1783: sysctl_createv(clog, 0, NULL, NULL,
1784: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1785: CTLTYPE_INT, "accept_rtadv",
1786: SYSCTL_DESCR("Accept router advertisements"),
1.70 atatat 1787: NULL, 0, &ip6_accept_rtadv, 0,
1788: CTL_NET, PF_INET6, IPPROTO_IPV6,
1789: IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73 atatat 1790: sysctl_createv(clog, 0, NULL, NULL,
1791: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1792: CTLTYPE_INT, "keepfaith",
1793: SYSCTL_DESCR("Activate faith interface"),
1.70 atatat 1794: NULL, 0, &ip6_keepfaith, 0,
1795: CTL_NET, PF_INET6, IPPROTO_IPV6,
1796: IPV6CTL_KEEPFAITH, CTL_EOL);
1.73 atatat 1797: sysctl_createv(clog, 0, NULL, NULL,
1798: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1799: CTLTYPE_INT, "log_interval",
1800: SYSCTL_DESCR("Minumum interval between logging "
1801: "unroutable packets"),
1.70 atatat 1802: NULL, 0, &ip6_log_interval, 0,
1803: CTL_NET, PF_INET6, IPPROTO_IPV6,
1804: IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73 atatat 1805: sysctl_createv(clog, 0, NULL, NULL,
1806: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1807: CTLTYPE_INT, "hdrnestlimit",
1808: SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70 atatat 1809: NULL, 0, &ip6_hdrnestlimit, 0,
1810: CTL_NET, PF_INET6, IPPROTO_IPV6,
1811: IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73 atatat 1812: sysctl_createv(clog, 0, NULL, NULL,
1813: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1814: CTLTYPE_INT, "dad_count",
1815: SYSCTL_DESCR("Number of Duplicate Address Detection "
1816: "probes to send"),
1.70 atatat 1817: NULL, 0, &ip6_dad_count, 0,
1818: CTL_NET, PF_INET6, IPPROTO_IPV6,
1819: IPV6CTL_DAD_COUNT, CTL_EOL);
1.73 atatat 1820: sysctl_createv(clog, 0, NULL, NULL,
1821: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1822: CTLTYPE_INT, "auto_flowlabel",
1823: SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70 atatat 1824: NULL, 0, &ip6_auto_flowlabel, 0,
1825: CTL_NET, PF_INET6, IPPROTO_IPV6,
1826: IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73 atatat 1827: sysctl_createv(clog, 0, NULL, NULL,
1828: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1829: CTLTYPE_INT, "defmcasthlim",
1830: SYSCTL_DESCR("Default multicast hop limit"),
1.70 atatat 1831: NULL, 0, &ip6_defmcasthlim, 0,
1832: CTL_NET, PF_INET6, IPPROTO_IPV6,
1833: IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51 itojun 1834: #if NGIF > 0
1.73 atatat 1835: sysctl_createv(clog, 0, NULL, NULL,
1836: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1837: CTLTYPE_INT, "gifhlim",
1838: SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70 atatat 1839: NULL, 0, &ip6_gif_hlim, 0,
1840: CTL_NET, PF_INET6, IPPROTO_IPV6,
1841: IPV6CTL_GIF_HLIM, CTL_EOL);
1842: #endif /* NGIF */
1.73 atatat 1843: sysctl_createv(clog, 0, NULL, NULL,
1844: CTLFLAG_PERMANENT,
1.74 atatat 1845: CTLTYPE_STRING, "kame_version",
1846: SYSCTL_DESCR("KAME Version"),
1.78 christos 1847: NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70 atatat 1848: CTL_NET, PF_INET6, IPPROTO_IPV6,
1849: IPV6CTL_KAME_VERSION, CTL_EOL);
1.73 atatat 1850: sysctl_createv(clog, 0, NULL, NULL,
1851: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1852: CTLTYPE_INT, "use_deprecated",
1853: SYSCTL_DESCR("Allow use of deprecated addresses as "
1854: "source addresses"),
1.70 atatat 1855: NULL, 0, &ip6_use_deprecated, 0,
1856: CTL_NET, PF_INET6, IPPROTO_IPV6,
1857: IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73 atatat 1858: sysctl_createv(clog, 0, NULL, NULL,
1859: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1860: CTLTYPE_INT, "rr_prune", NULL,
1861: NULL, 0, &ip6_rr_prune, 0,
1862: CTL_NET, PF_INET6, IPPROTO_IPV6,
1863: IPV6CTL_RR_PRUNE, CTL_EOL);
1.73 atatat 1864: sysctl_createv(clog, 0, NULL, NULL,
1865: CTLFLAG_PERMANENT
1.70 atatat 1866: #ifndef INET6_BINDV6ONLY
1.73 atatat 1867: |CTLFLAG_READWRITE,
1.70 atatat 1868: #endif
1.74 atatat 1869: CTLTYPE_INT, "v6only",
1870: SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1871: "to PF_INET sockets"),
1.70 atatat 1872: NULL, 0, &ip6_v6only, 0,
1873: CTL_NET, PF_INET6, IPPROTO_IPV6,
1874: IPV6CTL_V6ONLY, CTL_EOL);
1.73 atatat 1875: sysctl_createv(clog, 0, NULL, NULL,
1876: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1877: CTLTYPE_INT, "anonportmin",
1878: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70 atatat 1879: sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1880: CTL_NET, PF_INET6, IPPROTO_IPV6,
1881: IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73 atatat 1882: sysctl_createv(clog, 0, NULL, NULL,
1883: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1884: CTLTYPE_INT, "anonportmax",
1885: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70 atatat 1886: sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1887: CTL_NET, PF_INET6, IPPROTO_IPV6,
1888: IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26 itojun 1889: #ifndef IPNOPRIVPORTS
1.73 atatat 1890: sysctl_createv(clog, 0, NULL, NULL,
1891: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1892: CTLTYPE_INT, "lowportmin",
1893: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1894: "to assign"),
1.70 atatat 1895: sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1896: CTL_NET, PF_INET6, IPPROTO_IPV6,
1897: IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73 atatat 1898: sysctl_createv(clog, 0, NULL, NULL,
1899: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1900: CTLTYPE_INT, "lowportmax",
1901: SYSCTL_DESCR("Highest privileged ephemeral port number "
1902: "to assign"),
1.70 atatat 1903: sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1904: CTL_NET, PF_INET6, IPPROTO_IPV6,
1905: IPV6CTL_LOWPORTMAX, CTL_EOL);
1906: #endif /* IPNOPRIVPORTS */
1.73 atatat 1907: sysctl_createv(clog, 0, NULL, NULL,
1908: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83 rpaulo 1909: CTLTYPE_INT, "use_tempaddr",
1910: SYSCTL_DESCR("Use temporary address"),
1911: NULL, 0, &ip6_use_tempaddr, 0,
1912: CTL_NET, PF_INET6, IPPROTO_IPV6,
1913: CTL_CREATE, CTL_EOL);
1914: sysctl_createv(clog, 0, NULL, NULL,
1915: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1916: CTLTYPE_INT, "temppltime",
1917: SYSCTL_DESCR("preferred lifetime of a temporary address"),
1918: NULL, 0, &ip6_temp_preferred_lifetime, 0,
1919: CTL_NET, PF_INET6, IPPROTO_IPV6,
1920: CTL_CREATE, CTL_EOL);
1921: sysctl_createv(clog, 0, NULL, NULL,
1922: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1923: CTLTYPE_INT, "tempvltime",
1924: SYSCTL_DESCR("valid lifetime of a temporary address"),
1925: NULL, 0, &ip6_temp_valid_lifetime, 0,
1926: CTL_NET, PF_INET6, IPPROTO_IPV6,
1927: CTL_CREATE, CTL_EOL);
1928: sysctl_createv(clog, 0, NULL, NULL,
1929: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1930: CTLTYPE_INT, "maxfrags",
1931: SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70 atatat 1932: NULL, 0, &ip6_maxfrags, 0,
1933: CTL_NET, PF_INET6, IPPROTO_IPV6,
1934: IPV6CTL_MAXFRAGS, CTL_EOL);
1.79 rpaulo 1935: sysctl_createv(clog, 0, NULL, NULL,
1936: CTLFLAG_PERMANENT,
1937: CTLTYPE_STRUCT, "stats",
1938: SYSCTL_DESCR("IPv6 statistics"),
1.116 thorpej 1939: sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79 rpaulo 1940: CTL_NET, PF_INET6, IPPROTO_IPV6,
1941: IPV6CTL_STATS, CTL_EOL);
1.81 rpaulo 1942: sysctl_createv(clog, 0, NULL, NULL,
1943: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1944: CTLTYPE_INT, "use_defaultzone",
1945: SYSCTL_DESCR("Whether to use the default scope zones"),
1946: NULL, 0, &ip6_use_defzone, 0,
1947: CTL_NET, PF_INET6, IPPROTO_IPV6,
1948: IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83 rpaulo 1949: sysctl_createv(clog, 0, NULL, NULL,
1950: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1951: CTLTYPE_INT, "mcast_pmtu",
1952: SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1953: NULL, 0, &ip6_mcast_pmtu, 0,
1954: CTL_NET, PF_INET6, IPPROTO_IPV6,
1955: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1956: #ifdef GATEWAY
1957: sysctl_createv(clog, 0, NULL, NULL,
1958: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1959: CTLTYPE_INT, "maxflows",
1960: SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101 liamjfoy 1961: sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98 liamjfoy 1962: CTL_NET, PF_INET6, IPPROTO_IPV6,
1963: CTL_CREATE, CTL_EOL);
1.99 liamjfoy 1964: sysctl_createv(clog, 0, NULL, NULL,
1965: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1966: CTLTYPE_INT, "hashsize",
1967: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1968: sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1969: CTL_NET, PF_INET6, IPPROTO_IPV6,
1970: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1971: #endif
1.2 itojun 1972: }
1.116 thorpej 1973:
1974: void
1975: ip6_statinc(u_int stat)
1976: {
1977:
1978: KASSERT(stat < IP6_NSTATS);
1979: IP6_STATINC(stat);
1980: }
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