Annotation of src/sys/netinet6/ip6_input.c, Revision 1.122.4.1
1.122.4.1! bouyer 1: /* $NetBSD$ */
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>
1.122.4.1! bouyer 65: __KERNEL_RCSID(0, "$NetBSD$");
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"
1.2 itojun 71:
72: #include <sys/param.h>
73: #include <sys/systm.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/domain.h>
77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
80: #include <sys/errno.h>
81: #include <sys/time.h>
82: #include <sys/kernel.h>
83: #include <sys/syslog.h>
84: #include <sys/proc.h>
1.46 simonb 85: #include <sys/sysctl.h>
1.2 itojun 86:
87: #include <net/if.h>
88: #include <net/if_types.h>
89: #include <net/if_dl.h>
90: #include <net/route.h>
91: #include <net/netisr.h>
1.15 darrenr 92: #ifdef PFIL_HOOKS
93: #include <net/pfil.h>
94: #endif
1.2 itojun 95:
96: #include <netinet/in.h>
1.9 itojun 97: #include <netinet/in_systm.h>
98: #ifdef INET
99: #include <netinet/ip.h>
100: #include <netinet/ip_icmp.h>
1.45 itojun 101: #endif /* INET */
1.14 itojun 102: #include <netinet/ip6.h>
1.2 itojun 103: #include <netinet6/in6_var.h>
1.11 itojun 104: #include <netinet6/ip6_var.h>
1.116 thorpej 105: #include <netinet6/ip6_private.h>
1.2 itojun 106: #include <netinet6/in6_pcb.h>
1.14 itojun 107: #include <netinet/icmp6.h>
1.81 rpaulo 108: #include <netinet6/scope6_var.h>
1.2 itojun 109: #include <netinet6/in6_ifattach.h>
110: #include <netinet6/nd6.h>
111:
1.37 itojun 112: #ifdef IPSEC
113: #include <netinet6/ipsec.h>
1.117 thorpej 114: #include <netinet6/ipsec_private.h>
1.37 itojun 115: #endif
116:
1.94 degroote 117: #ifdef FAST_IPSEC
118: #include <netipsec/ipsec.h>
119: #include <netipsec/ipsec6.h>
120: #include <netipsec/key.h>
121: #endif /* FAST_IPSEC */
122:
1.2 itojun 123: #include <netinet6/ip6protosw.h>
124:
125: #include "faith.h"
126: #include "gif.h"
1.50 itojun 127:
128: #if NGIF > 0
129: #include <netinet6/in6_gif.h>
130: #endif
1.2 itojun 131:
1.9 itojun 132: #include <net/net_osdep.h>
133:
1.2 itojun 134: extern struct domain inet6domain;
135:
136: u_char ip6_protox[IPPROTO_MAX];
137: static int ip6qmaxlen = IFQ_MAXLEN;
138: struct in6_ifaddr *in6_ifaddr;
139: struct ifqueue ip6intrq;
140:
1.108 ad 141: extern callout_t in6_tmpaddrtimer_ch;
1.83 rpaulo 142:
1.2 itojun 143: int ip6_forward_srcrt; /* XXX */
144: int ip6_sourcecheck; /* XXX */
145: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 146:
1.29 thorpej 147: #ifdef PFIL_HOOKS
148: struct pfil_head inet6_pfil_hook;
149: #endif
150:
1.116 thorpej 151: percpu_t *ip6stat_percpu;
1.2 itojun 152:
1.111 dyoung 153: static void ip6_init2(void *);
1.112 dyoung 154: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2 itojun 155:
1.111 dyoung 156: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
157: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.2 itojun 158:
159: /*
160: * IP6 initialization: fill in IP6 protocol switch table.
161: * All protocols not implemented in kernel go to raw IP6 protocol handler.
162: */
163: void
1.114 matt 164: ip6_init(void)
1.2 itojun 165: {
1.78 christos 166: const struct ip6protosw *pr;
1.35 itojun 167: int i;
1.2 itojun 168:
1.78 christos 169: pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2 itojun 170: if (pr == 0)
171: panic("ip6_init");
172: for (i = 0; i < IPPROTO_MAX; i++)
173: ip6_protox[i] = pr - inet6sw;
1.78 christos 174: for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
175: pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2 itojun 176: if (pr->pr_domain->dom_family == PF_INET6 &&
177: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
178: ip6_protox[pr->pr_protocol] = pr - inet6sw;
179: ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81 rpaulo 180: scope6_init();
181: addrsel_policy_init();
1.2 itojun 182: nd6_init();
183: frag6_init();
1.83 rpaulo 184: ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2 itojun 185:
186: ip6_init2((void *)0);
1.98 liamjfoy 187: #ifdef GATEWAY
1.99 liamjfoy 188: ip6flow_init(ip6_hashsize);
1.98 liamjfoy 189: #endif
1.29 thorpej 190:
191: #ifdef PFIL_HOOKS
192: /* Register our Packet Filter hook. */
1.33 thorpej 193: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
194: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 195: i = pfil_head_register(&inet6_pfil_hook);
196: if (i != 0)
197: printf("ip6_init: WARNING: unable to register pfil hook, "
198: "error %d\n", i);
199: #endif /* PFIL_HOOKS */
1.116 thorpej 200:
201: ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2 itojun 202: }
203:
204: static void
1.90 christos 205: ip6_init2(void *dummy)
1.2 itojun 206: {
207:
208: /* nd6_timer_init */
1.118 ad 209: callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19 thorpej 210: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83 rpaulo 211:
212: /* timer for regeneranation of temporary addresses randomize ID */
1.118 ad 213: callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83 rpaulo 214: callout_reset(&in6_tmpaddrtimer_ch,
215: (ip6_temp_preferred_lifetime - ip6_desync_factor -
216: ip6_temp_regen_advance) * hz,
217: in6_tmpaddrtimer, NULL);
1.2 itojun 218: }
219:
220: /*
221: * IP6 input interrupt handling. Just pass the packet to ip6_input.
222: */
223: void
1.114 matt 224: ip6intr(void)
1.2 itojun 225: {
226: int s;
227: struct mbuf *m;
228:
1.118 ad 229: mutex_enter(softnet_lock);
230: KERNEL_LOCK(1, NULL);
1.2 itojun 231: for (;;) {
1.41 thorpej 232: s = splnet();
1.2 itojun 233: IF_DEQUEUE(&ip6intrq, m);
234: splx(s);
235: if (m == 0)
1.118 ad 236: break;
1.83 rpaulo 237: /* drop the packet if IPv6 operation is disabled on the IF */
238: if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
239: m_freem(m);
1.118 ad 240: break;
1.83 rpaulo 241: }
1.2 itojun 242: ip6_input(m);
243: }
1.118 ad 244: KERNEL_UNLOCK_ONE(NULL);
245: mutex_exit(softnet_lock);
1.2 itojun 246: }
247:
1.103 dyoung 248: extern struct route ip6_forward_rt;
1.2 itojun 249:
250: void
1.96 dyoung 251: ip6_input(struct mbuf *m)
1.2 itojun 252: {
1.9 itojun 253: struct ip6_hdr *ip6;
1.105 dyoung 254: int hit, off = sizeof(struct ip6_hdr), nest;
1.2 itojun 255: u_int32_t plen;
1.5 itojun 256: u_int32_t rtalert = ~0;
1.104 yamt 257: int nxt, ours = 0, rh_present = 0;
1.9 itojun 258: struct ifnet *deliverifp = NULL;
1.64 itojun 259: int srcrt = 0;
1.105 dyoung 260: const struct rtentry *rt;
261: union {
262: struct sockaddr dst;
263: struct sockaddr_in6 dst6;
264: } u;
1.94 degroote 265: #ifdef FAST_IPSEC
266: struct m_tag *mtag;
267: struct tdb_ident *tdbi;
268: struct secpolicy *sp;
269: int s, error;
270: #endif
1.2 itojun 271:
272: #ifdef IPSEC
273: /*
274: * should the inner packet be considered authentic?
275: * see comment in ah4_input().
276: */
1.49 itojun 277: m->m_flags &= ~M_AUTHIPHDR;
278: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 279: #endif
1.9 itojun 280:
1.2 itojun 281: /*
1.81 rpaulo 282: * make sure we don't have onion peering information into m_tag.
283: */
284: ip6_delaux(m);
285:
286: /*
1.44 itojun 287: * mbuf statistics
1.2 itojun 288: */
289: if (m->m_flags & M_EXT) {
290: if (m->m_next)
1.116 thorpej 291: IP6_STATINC(IP6_STAT_MEXT2M);
1.2 itojun 292: else
1.116 thorpej 293: IP6_STATINC(IP6_STAT_MEXT1);
1.2 itojun 294: } else {
1.115 thorpej 295: #define M2MMAX 32
1.2 itojun 296: if (m->m_next) {
1.9 itojun 297: if (m->m_flags & M_LOOP) {
1.116 thorpej 298: /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115 thorpej 299: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116 thorpej 300: IP6_STATINC(IP6_STAT_M2M +
301: m->m_pkthdr.rcvif->if_index);
1.115 thorpej 302: } else
1.116 thorpej 303: IP6_STATINC(IP6_STAT_M2M);
1.2 itojun 304: } else
1.116 thorpej 305: IP6_STATINC(IP6_STAT_M1);
1.40 itojun 306: #undef M2MMAX
1.2 itojun 307: }
308:
1.9 itojun 309: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116 thorpej 310: IP6_STATINC(IP6_STAT_TOTAL);
1.9 itojun 311:
1.57 thorpej 312: /*
313: * If the IPv6 header is not aligned, slurp it up into a new
314: * mbuf with space for link headers, in the event we forward
1.81 rpaulo 315: * it. Otherwise, if it is aligned, make sure the entire base
1.57 thorpej 316: * IPv6 header is in the first mbuf of the chain.
317: */
1.97 christos 318: if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57 thorpej 319: struct ifnet *inifp = m->m_pkthdr.rcvif;
320: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
321: (max_linkhdr + 3) & ~3)) == NULL) {
322: /* XXXJRT new stat, please */
1.116 thorpej 323: IP6_STATINC(IP6_STAT_TOOSMALL);
1.57 thorpej 324: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
325: return;
326: }
327: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
328: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 329: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116 thorpej 330: IP6_STATINC(IP6_STAT_TOOSMALL);
1.9 itojun 331: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
332: return;
333: }
1.2 itojun 334: }
335:
336: ip6 = mtod(m, struct ip6_hdr *);
337:
338: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116 thorpej 339: IP6_STATINC(IP6_STAT_BADVERS);
1.9 itojun 340: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 341: goto bad;
342: }
1.15 darrenr 343:
1.98 liamjfoy 344: #if defined(IPSEC)
345: /* IPv6 fast forwarding is not compatible with IPsec. */
346: m->m_flags &= ~M_CANFASTFWD;
347: #else
348: /*
349: * Assume that we can create a fast-forward IP flow entry
350: * based on this packet.
351: */
352: m->m_flags |= M_CANFASTFWD;
353: #endif
354:
1.15 darrenr 355: #ifdef PFIL_HOOKS
356: /*
357: * Run through list of hooks for input packets. If there are any
358: * filters which require that additional packets in the flow are
359: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
360: * Note that filters must _never_ set this flag, as another filter
361: * in the list may have previously cleared it.
362: */
1.39 itojun 363: /*
364: * let ipfilter look at packet on the wire,
365: * not the decapsulated packet.
366: */
367: #ifdef IPSEC
1.42 itojun 368: if (!ipsec_getnhist(m))
1.94 degroote 369: #elif defined(FAST_IPSEC)
370: if (!ipsec_indone(m))
1.39 itojun 371: #else
372: if (1)
373: #endif
374: {
1.64 itojun 375: struct in6_addr odst;
376:
377: odst = ip6->ip6_dst;
1.39 itojun 378: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
379: PFIL_IN) != 0)
380: return;
381: if (m == NULL)
382: return;
383: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 384: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 385: }
1.15 darrenr 386: #endif /* PFIL_HOOKS */
387:
1.116 thorpej 388: IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2 itojun 389:
1.30 thorpej 390: #ifdef ALTQ
391: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
392: /* packet is dropped by traffic conditioner */
393: return;
1.9 itojun 394: }
395: #endif
396:
1.2 itojun 397: /*
1.44 itojun 398: * Check against address spoofing/corruption.
1.2 itojun 399: */
400: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
401: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 402: /*
403: * XXX: "badscope" is not very suitable for a multicast source.
404: */
1.116 thorpej 405: IP6_STATINC(IP6_STAT_BADSCOPE);
1.9 itojun 406: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 407: goto bad;
408: }
1.13 itojun 409: /*
1.44 itojun 410: * The following check is not documented in specs. A malicious
411: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
412: * and bypass security checks (act as if it was from 127.0.0.1 by using
413: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 414: *
1.44 itojun 415: * This check chokes if we are in an SIIT cloud. As none of BSDs
416: * support IPv4-less kernel compilation, we cannot support SIIT
417: * environment at all. So, it makes more sense for us to reject any
418: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 419: * partial support for SIIT environment.
1.13 itojun 420: */
421: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
422: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 423: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 424: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
425: goto bad;
426: }
1.17 itojun 427: #if 0
1.13 itojun 428: /*
1.17 itojun 429: * Reject packets with IPv4 compatible addresses (auto tunnel).
430: *
431: * The code forbids auto tunnel relay case in RFC1933 (the check is
432: * stronger than RFC1933). We may want to re-enable it if mech-xx
433: * is revised to forbid relaying case.
1.13 itojun 434: */
435: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
436: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116 thorpej 437: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 438: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
439: goto bad;
440: }
441: #endif
1.35 itojun 442:
1.2 itojun 443: /*
1.82 yamt 444: * Disambiguate address scope zones (if there is ambiguity).
445: * We first make sure that the original source or destination address
446: * is not in our internal form for scoped addresses. Such addresses
447: * are not necessarily invalid spec-wise, but we cannot accept them due
448: * to the usage conflict.
449: * in6_setscope() then also checks and rejects the cases where src or
450: * dst are the loopback address and the receiving interface
451: * is not loopback.
452: */
1.88 bouyer 453: if (__predict_false(
454: m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
455: goto bad;
456: ip6 = mtod(m, struct ip6_hdr *);
1.82 yamt 457: if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116 thorpej 458: IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82 yamt 459: goto bad;
460: }
461: if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
462: in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116 thorpej 463: IP6_STATINC(IP6_STAT_BADSCOPE);
1.82 yamt 464: goto bad;
465: }
466:
467: /*
1.2 itojun 468: * Multicast check
469: */
470: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
471: struct in6_multi *in6m = 0;
1.9 itojun 472:
473: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 474: /*
475: * See if we belong to the destination multicast group on the
476: * arrival interface.
477: */
478: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
479: if (in6m)
480: ours = 1;
481: else if (!ip6_mrouter) {
1.116 thorpej 482: uint64_t *ip6s = IP6_STAT_GETREF();
483: ip6s[IP6_STAT_NOTMEMBER]++;
484: ip6s[IP6_STAT_CANTFORWARD]++;
485: IP6_STAT_PUTREF();
1.9 itojun 486: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 487: goto bad;
488: }
1.9 itojun 489: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 490: goto hbhcheck;
491: }
492:
1.105 dyoung 493: sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
494:
1.2 itojun 495: /*
496: * Unicast check
497: */
1.105 dyoung 498: rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
499: if (hit)
1.116 thorpej 500: IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93 joerg 501: else
1.116 thorpej 502: IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22 itojun 503:
1.109 dyoung 504: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2 itojun 505:
506: /*
507: * Accept the packet if the forwarding interface to the destination
508: * according to the routing table is the loopback interface,
509: * unless the associated route has a gateway.
510: * Note that this approach causes to accept a packet if there is a
511: * route to the loopback interface for the destination of the packet.
512: * But we think it's even useful in some situations, e.g. when using
513: * a special daemon which wants to intercept the packet.
514: */
1.105 dyoung 515: if (rt != NULL &&
516: (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
517: !(rt->rt_flags & RTF_CLONED) &&
1.2 itojun 518: #if 0
519: /*
520: * The check below is redundant since the comparison of
521: * the destination and the key of the rtentry has
522: * already done through looking up the routing table.
523: */
1.109 dyoung 524: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2 itojun 525: #endif
1.105 dyoung 526: rt->rt_ifp->if_type == IFT_LOOP) {
527: struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2 itojun 528: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
529: m->m_flags |= M_ANYCAST6;
1.24 itojun 530: /*
531: * packets to a tentative, duplicated, or somehow invalid
532: * address must not be accepted.
533: */
1.2 itojun 534: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 535: /* this address is ready */
1.2 itojun 536: ours = 1;
1.9 itojun 537: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 538: goto hbhcheck;
539: } else {
1.24 itojun 540: /* address is not ready, so discard the packet. */
1.34 itojun 541: nd6log((LOG_INFO,
1.27 itojun 542: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 543: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 544: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 545:
546: goto bad;
1.2 itojun 547: }
548: }
549:
550: /*
1.55 itojun 551: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 552: */
553: #if defined(NFAITH) && 0 < NFAITH
554: if (ip6_keepfaith) {
1.105 dyoung 555: if (rt != NULL && rt->rt_ifp != NULL &&
556: rt->rt_ifp->if_type == IFT_FAITH) {
1.2 itojun 557: /* XXX do we need more sanity checks? */
558: ours = 1;
1.105 dyoung 559: deliverifp = rt->rt_ifp; /* faith */
1.9 itojun 560: goto hbhcheck;
561: }
562: }
563: #endif
564:
565: #if 0
566: {
567: /*
568: * Last resort: check in6_ifaddr for incoming interface.
569: * The code is here until I update the "goto ours hack" code above
570: * working right.
571: */
572: struct ifaddr *ifa;
1.113 dyoung 573: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9 itojun 574: if (ifa->ifa_addr == NULL)
575: continue; /* just for safety */
576: if (ifa->ifa_addr->sa_family != AF_INET6)
577: continue;
578: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
579: ours = 1;
580: deliverifp = ifa->ifa_ifp;
1.2 itojun 581: goto hbhcheck;
582: }
583: }
1.9 itojun 584: }
1.2 itojun 585: #endif
586:
587: /*
588: * Now there is no reason to process the packet if it's not our own
589: * and we're not a router.
590: */
591: if (!ip6_forwarding) {
1.116 thorpej 592: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9 itojun 593: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 594: goto bad;
595: }
596:
597: hbhcheck:
598: /*
1.81 rpaulo 599: * record address information into m_tag, if we don't have one yet.
600: * note that we are unable to record it, if the address is not listed
601: * as our interface address (e.g. multicast addresses, addresses
602: * within FAITH prefixes and such).
603: */
1.111 dyoung 604: if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81 rpaulo 605: struct in6_ifaddr *ia6;
606:
607: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111 dyoung 608: if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
609: /*
610: * XXX maybe we should drop the packet here,
611: * as we could not provide enough information
612: * to the upper layers.
613: */
1.81 rpaulo 614: }
615: }
616:
617: /*
1.2 itojun 618: * Process Hop-by-Hop options header if it's contained.
619: * m may be modified in ip6_hopopts_input().
620: * If a JumboPayload option is included, plen will also be modified.
621: */
622: plen = (u_int32_t)ntohs(ip6->ip6_plen);
623: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 624: struct ip6_hbh *hbh;
625:
626: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
627: #if 0 /*touches NULL pointer*/
628: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
629: #endif
1.2 itojun 630: return; /* m have already been freed */
1.9 itojun 631: }
1.22 itojun 632:
1.2 itojun 633: /* adjust pointer */
634: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 635:
636: /*
1.49 itojun 637: * if the payload length field is 0 and the next header field
1.22 itojun 638: * indicates Hop-by-Hop Options header, then a Jumbo Payload
639: * option MUST be included.
640: */
641: if (ip6->ip6_plen == 0 && plen == 0) {
642: /*
643: * Note that if a valid jumbo payload option is
1.83 rpaulo 644: * contained, ip6_hopopts_input() must set a valid
1.55 itojun 645: * (non-zero) payload length to the variable plen.
1.22 itojun 646: */
1.116 thorpej 647: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 648: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
649: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
650: icmp6_error(m, ICMP6_PARAM_PROB,
651: ICMP6_PARAMPROB_HEADER,
1.97 christos 652: (char *)&ip6->ip6_plen - (char *)ip6);
1.22 itojun 653: return;
654: }
1.9 itojun 655: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
656: sizeof(struct ip6_hbh));
657: if (hbh == NULL) {
1.116 thorpej 658: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 659: return;
660: }
1.57 thorpej 661: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 662: nxt = hbh->ip6h_nxt;
1.2 itojun 663:
664: /*
665: * accept the packet if a router alert option is included
666: * and we act as an IPv6 router.
667: */
1.5 itojun 668: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 669: ours = 1;
670: } else
671: nxt = ip6->ip6_nxt;
672:
673: /*
674: * Check that the amount of data in the buffers
675: * is as at least much as the IPv6 header would have us expect.
676: * Trim mbufs if longer than we expect.
677: * Drop packet if shorter than we expect.
678: */
679: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116 thorpej 680: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 681: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 682: goto bad;
683: }
684: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
685: if (m->m_len == m->m_pkthdr.len) {
686: m->m_len = sizeof(struct ip6_hdr) + plen;
687: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
688: } else
689: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
690: }
691:
692: /*
693: * Forward if desirable.
694: */
695: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
696: /*
697: * If we are acting as a multicast router, all
698: * incoming multicast packets are passed to the
699: * kernel-level multicast forwarding function.
700: * The packet is returned (relatively) intact; if
701: * ip6_mforward() returns a non-zero value, the packet
702: * must be discarded, else it may be accepted below.
703: */
704: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116 thorpej 705: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2 itojun 706: m_freem(m);
707: return;
708: }
709: if (!ours) {
710: m_freem(m);
711: return;
712: }
1.22 itojun 713: } else if (!ours) {
1.64 itojun 714: ip6_forward(m, srcrt);
1.2 itojun 715: return;
1.56 itojun 716: }
1.25 itojun 717:
718: ip6 = mtod(m, struct ip6_hdr *);
719:
720: /*
721: * Malicious party may be able to use IPv4 mapped addr to confuse
722: * tcp/udp stack and bypass security checks (act as if it was from
723: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
724: *
725: * For SIIT end node behavior, you may want to disable the check.
726: * However, you will become vulnerable to attacks using IPv4 mapped
727: * source.
728: */
729: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
730: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 731: IP6_STATINC(IP6_STAT_BADSCOPE);
1.25 itojun 732: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
733: goto bad;
734: }
1.2 itojun 735:
736: /*
737: * Tell launch routine the next header
738: */
1.12 itojun 739: #ifdef IFA_STATS
1.28 itojun 740: if (deliverifp != NULL) {
1.9 itojun 741: struct in6_ifaddr *ia6;
742: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
743: if (ia6)
744: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
745: }
746: #endif
1.116 thorpej 747: IP6_STATINC(IP6_STAT_DELIVERED);
1.9 itojun 748: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 749: nest = 0;
1.40 itojun 750:
1.104 yamt 751: rh_present = 0;
1.2 itojun 752: while (nxt != IPPROTO_DONE) {
753: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116 thorpej 754: IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104 yamt 755: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 756: goto bad;
757: }
1.8 itojun 758:
759: /*
760: * protection against faulty packet - there should be
761: * more sanity checks in header chain processing.
762: */
763: if (m->m_pkthdr.len < off) {
1.116 thorpej 764: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 765: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 766: goto bad;
767: }
768:
1.104 yamt 769: if (nxt == IPPROTO_ROUTING) {
770: if (rh_present++) {
771: in6_ifstat_inc(m->m_pkthdr.rcvif,
772: ifs6_in_hdrerr);
1.116 thorpej 773: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104 yamt 774: goto bad;
775: }
776: }
777:
1.37 itojun 778: #ifdef IPSEC
779: /*
780: * enforce IPsec policy checking if we are seeing last header.
781: * note that we do not visit this with protocols with pcb layer
782: * code - like udp/tcp/raw ip.
783: */
784: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
785: ipsec6_in_reject(m, NULL)) {
1.117 thorpej 786: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37 itojun 787: goto bad;
788: }
789: #endif
1.94 degroote 790: #ifdef FAST_IPSEC
791: /*
792: * enforce IPsec policy checking if we are seeing last header.
793: * note that we do not visit this with protocols with pcb layer
794: * code - like udp/tcp/raw ip.
795: */
796: if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
797: /*
798: * Check if the packet has already had IPsec processing
799: * done. If so, then just pass it along. This tag gets
800: * set during AH, ESP, etc. input handling, before the
801: * packet is returned to the ip input queue for delivery.
802: */
803: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
804: s = splsoftnet();
805: if (mtag != NULL) {
806: tdbi = (struct tdb_ident *)(mtag + 1);
807: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
808: } else {
809: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
810: IP_FORWARDING, &error);
811: }
812: if (sp != NULL) {
813: /*
814: * Check security policy against packet attributes.
815: */
816: error = ipsec_in_reject(sp, m);
817: KEY_FREESP(&sp);
818: } else {
819: /* XXX error stat??? */
820: error = EINVAL;
821: DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
822: }
823: splx(s);
824: if (error)
825: goto bad;
826: }
827: #endif /* FAST_IPSEC */
828:
1.56 itojun 829:
1.2 itojun 830: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
831: }
832: return;
833: bad:
834: m_freem(m);
835: }
836:
837: /*
1.81 rpaulo 838: * set/grab in6_ifaddr correspond to IPv6 destination address.
839: */
840: static struct m_tag *
1.112 dyoung 841: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81 rpaulo 842: {
843: struct m_tag *mtag;
844:
845: mtag = ip6_addaux(m);
1.112 dyoung 846: if (mtag != NULL) {
847: struct ip6aux *ip6a;
848:
849: ip6a = (struct ip6aux *)(mtag + 1);
850: in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
851: ip6a->ip6a_src = ia->ia_addr.sin6_addr;
852: ip6a->ip6a_flags = ia->ia6_flags;
853: }
1.81 rpaulo 854: return mtag; /* NULL if failed to set */
855: }
856:
1.112 dyoung 857: const struct ip6aux *
1.107 christos 858: ip6_getdstifaddr(struct mbuf *m)
1.81 rpaulo 859: {
860: struct m_tag *mtag;
861:
862: mtag = ip6_findaux(m);
1.112 dyoung 863: if (mtag != NULL)
864: return (struct ip6aux *)(mtag + 1);
1.81 rpaulo 865: else
866: return NULL;
867: }
868:
869: /*
1.2 itojun 870: * Hop-by-Hop options header processing. If a valid jumbo payload option is
871: * included, the real payload length will be stored in plenp.
1.107 christos 872: *
873: * rtalertp - XXX: should be stored more smart way
1.2 itojun 874: */
875: static int
1.107 christos 876: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
877: struct mbuf **mp, int *offp)
1.2 itojun 878: {
1.35 itojun 879: struct mbuf *m = *mp;
1.2 itojun 880: int off = *offp, hbhlen;
881: struct ip6_hbh *hbh;
882:
883: /* validation of the length of the header */
1.9 itojun 884: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
885: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
886: if (hbh == NULL) {
1.116 thorpej 887: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 888: return -1;
889: }
890: hbhlen = (hbh->ip6h_len + 1) << 3;
891: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
892: hbhlen);
893: if (hbh == NULL) {
1.116 thorpej 894: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 895: return -1;
896: }
1.57 thorpej 897: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 898: off += hbhlen;
899: hbhlen -= sizeof(struct ip6_hbh);
900:
901: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
902: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 903: return (-1);
1.2 itojun 904:
905: *offp = off;
906: *mp = m;
1.58 itojun 907: return (0);
1.2 itojun 908: }
909:
910: /*
911: * Search header for all Hop-by-hop options and process each option.
912: * This function is separate from ip6_hopopts_input() in order to
913: * handle a case where the sending node itself process its hop-by-hop
914: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 915: *
916: * The function assumes that hbh header is located right after the IPv6 header
917: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
918: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 919: */
920: int
1.107 christos 921: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
922: u_int32_t *rtalertp, u_int32_t *plenp)
1.2 itojun 923: {
924: struct ip6_hdr *ip6;
925: int optlen = 0;
926: u_int8_t *opt = opthead;
927: u_int16_t rtalert_val;
1.22 itojun 928: u_int32_t jumboplen;
1.55 itojun 929: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 930:
931: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 932: switch (*opt) {
933: case IP6OPT_PAD1:
934: optlen = 1;
935: break;
936: case IP6OPT_PADN:
937: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 938: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 939: goto bad;
940: }
941: optlen = *(opt + 1) + 2;
942: break;
943: case IP6OPT_RTALERT:
944: /* XXX may need check for alignment */
945: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116 thorpej 946: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 947: goto bad;
948: }
949: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 950: /* XXX stat */
951: icmp6_error(m, ICMP6_PARAM_PROB,
952: ICMP6_PARAMPROB_HEADER,
953: erroff + opt + 1 - opthead);
954: return (-1);
1.35 itojun 955: }
956: optlen = IP6OPT_RTALERT_LEN;
1.97 christos 957: bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35 itojun 958: *rtalertp = ntohs(rtalert_val);
959: break;
960: case IP6OPT_JUMBO:
1.22 itojun 961: /* XXX may need check for alignment */
962: if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116 thorpej 963: IP6_STATINC(IP6_STAT_TOOSMALL);
1.22 itojun 964: goto bad;
965: }
1.35 itojun 966: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 967: /* XXX stat */
968: icmp6_error(m, ICMP6_PARAM_PROB,
969: ICMP6_PARAMPROB_HEADER,
970: erroff + opt + 1 - opthead);
971: return (-1);
1.35 itojun 972: }
1.22 itojun 973: optlen = IP6OPT_JUMBO_LEN;
974:
975: /*
976: * IPv6 packets that have non 0 payload length
1.35 itojun 977: * must not contain a jumbo payload option.
1.22 itojun 978: */
979: ip6 = mtod(m, struct ip6_hdr *);
980: if (ip6->ip6_plen) {
1.116 thorpej 981: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 982: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 983: ICMP6_PARAMPROB_HEADER,
984: erroff + opt - opthead);
985: return (-1);
1.22 itojun 986: }
1.2 itojun 987:
1.22 itojun 988: /*
989: * We may see jumbolen in unaligned location, so
990: * we'd need to perform bcopy().
991: */
992: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
993: jumboplen = (u_int32_t)htonl(jumboplen);
994:
995: #if 1
996: /*
997: * if there are multiple jumbo payload options,
998: * *plenp will be non-zero and the packet will be
999: * rejected.
1000: * the behavior may need some debate in ipngwg -
1001: * multiple options does not make sense, however,
1002: * there's no explicit mention in specification.
1003: */
1004: if (*plenp != 0) {
1.116 thorpej 1005: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1006: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1007: ICMP6_PARAMPROB_HEADER,
1008: erroff + opt + 2 - opthead);
1009: return (-1);
1.22 itojun 1010: }
1.8 itojun 1011: #endif
1.2 itojun 1012:
1.22 itojun 1013: /*
1014: * jumbo payload length must be larger than 65535.
1015: */
1016: if (jumboplen <= IPV6_MAXPACKET) {
1.116 thorpej 1017: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1018: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1019: ICMP6_PARAMPROB_HEADER,
1020: erroff + opt + 2 - opthead);
1021: return (-1);
1.22 itojun 1022: }
1023: *plenp = jumboplen;
1024:
1025: break;
1.35 itojun 1026: default: /* unknown option */
1027: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 1028: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 1029: goto bad;
1030: }
1.55 itojun 1031: optlen = ip6_unknown_opt(opt, m,
1032: erroff + opt - opthead);
1033: if (optlen == -1)
1034: return (-1);
1.35 itojun 1035: optlen += 2;
1036: break;
1.2 itojun 1037: }
1038: }
1039:
1.55 itojun 1040: return (0);
1.2 itojun 1041:
1042: bad:
1043: m_freem(m);
1.55 itojun 1044: return (-1);
1.2 itojun 1045: }
1046:
1047: /*
1048: * Unknown option processing.
1049: * The third argument `off' is the offset from the IPv6 header to the option,
1050: * which is necessary if the IPv6 header the and option header and IPv6 header
1051: * is not continuous in order to return an ICMPv6 error.
1052: */
1053: int
1.107 christos 1054: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2 itojun 1055: {
1056: struct ip6_hdr *ip6;
1057:
1.35 itojun 1058: switch (IP6OPT_TYPE(*optp)) {
1059: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 1060: return ((int)*(optp + 1));
1.35 itojun 1061: case IP6OPT_TYPE_DISCARD: /* silently discard */
1062: m_freem(m);
1.58 itojun 1063: return (-1);
1.35 itojun 1064: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116 thorpej 1065: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1066: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1067: return (-1);
1.35 itojun 1068: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116 thorpej 1069: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1070: ip6 = mtod(m, struct ip6_hdr *);
1071: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1072: (m->m_flags & (M_BCAST|M_MCAST)))
1073: m_freem(m);
1074: else
1075: icmp6_error(m, ICMP6_PARAM_PROB,
1076: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1077: return (-1);
1.2 itojun 1078: }
1079:
1080: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 1081: return (-1);
1.2 itojun 1082: }
1083:
1084: /*
1.9 itojun 1085: * Create the "control" list for this pcb.
1086: *
1087: * The routine will be called from upper layer handlers like tcp6_input().
1088: * Thus the routine assumes that the caller (tcp6_input) have already
1089: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1090: * very first mbuf on the mbuf chain.
1091: * We may want to add some infinite loop prevention or sanity checks for safety.
1092: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1093: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1094: */
1095: void
1.107 christos 1096: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1097: struct ip6_hdr *ip6, struct mbuf *m)
1.2 itojun 1098: {
1.85 rpaulo 1099: #ifdef RFC2292
1100: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1101: #else
1102: #define IS2292(x, y) (y)
1103: #endif
1104:
1.9 itojun 1105: #ifdef SO_TIMESTAMP
1.2 itojun 1106: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1107: struct timeval tv;
1108:
1109: microtime(&tv);
1.97 christos 1110: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63 itojun 1111: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1112: if (*mp)
1113: mp = &(*mp)->m_next;
1114: }
1.9 itojun 1115: #endif
1.87 rpaulo 1116:
1117: /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1118: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1119: return;
1120:
1.2 itojun 1121: /* RFC 2292 sec. 5 */
1.35 itojun 1122: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1123: struct in6_pktinfo pi6;
1.85 rpaulo 1124:
1.2 itojun 1125: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81 rpaulo 1126: in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84 christos 1127: pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1128: m->m_pkthdr.rcvif->if_index : 0;
1.97 christos 1129: *mp = sbcreatecontrol((void *) &pi6,
1.85 rpaulo 1130: sizeof(struct in6_pktinfo),
1131: IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2 itojun 1132: if (*mp)
1133: mp = &(*mp)->m_next;
1134: }
1.85 rpaulo 1135:
1.2 itojun 1136: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1137: int hlim = ip6->ip6_hlim & 0xff;
1.85 rpaulo 1138:
1.97 christos 1139: *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85 rpaulo 1140: IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1141: if (*mp)
1142: mp = &(*mp)->m_next;
1143: }
1144:
1145: if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1146: u_int32_t flowinfo;
1147: int tclass;
1148:
1149: flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1150: flowinfo >>= 20;
1151:
1152: tclass = flowinfo & 0xff;
1.97 christos 1153: *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85 rpaulo 1154: IPV6_TCLASS, IPPROTO_IPV6);
1155:
1.2 itojun 1156: if (*mp)
1157: mp = &(*mp)->m_next;
1158: }
1159:
1160: /*
1.75 itojun 1161: * IPV6_HOPOPTS socket option. Recall that we required super-user
1162: * privilege for the option (see ip6_ctloutput), but it might be too
1163: * strict, since there might be some hop-by-hop options which can be
1164: * returned to normal user.
1.85 rpaulo 1165: * See also RFC3542 section 8 (or RFC2292 section 6).
1.2 itojun 1166: */
1.75 itojun 1167: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2 itojun 1168: /*
1169: * Check if a hop-by-hop options header is contatined in the
1170: * received packet, and if so, store the options as ancillary
1171: * data. Note that a hop-by-hop options header must be
1172: * just after the IPv6 header, which fact is assured through
1173: * the IPv6 input processing.
1174: */
1.78 christos 1175: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1176: if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1177: struct ip6_hbh *hbh;
1178: int hbhlen;
1.62 itojun 1179: struct mbuf *ext;
1.9 itojun 1180:
1.62 itojun 1181: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78 christos 1182: xip6->ip6_nxt);
1.62 itojun 1183: if (ext == NULL) {
1.116 thorpej 1184: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1185: return;
1186: }
1.62 itojun 1187: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1188: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1189: if (hbhlen != ext->m_len) {
1190: m_freem(ext);
1.116 thorpej 1191: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1192: return;
1193: }
1.2 itojun 1194:
1195: /*
1196: * XXX: We copy whole the header even if a jumbo
1197: * payload option is included, which option is to
1198: * be removed before returning in the RFC 2292.
1.85 rpaulo 1199: * Note: this constraint is removed in RFC3542.
1.2 itojun 1200: */
1.97 christos 1201: *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85 rpaulo 1202: IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1203: IPPROTO_IPV6);
1.2 itojun 1204: if (*mp)
1205: mp = &(*mp)->m_next;
1.62 itojun 1206: m_freem(ext);
1.2 itojun 1207: }
1208: }
1209:
1210: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1211: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78 christos 1212: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1213: int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1214:
1215: /*
1216: * Search for destination options headers or routing
1217: * header(s) through the header chain, and stores each
1218: * header as ancillary data.
1219: * Note that the order of the headers remains in
1220: * the chain of ancillary data.
1221: */
1.86 rpaulo 1222: for (;;) { /* is explicit loop prevention necessary? */
1.62 itojun 1223: struct ip6_ext *ip6e = NULL;
1.9 itojun 1224: int elen;
1.62 itojun 1225: struct mbuf *ext = NULL;
1.9 itojun 1226:
1.62 itojun 1227: /*
1228: * if it is not an extension header, don't try to
1229: * pull it from the chain.
1230: */
1231: switch (nxt) {
1232: case IPPROTO_DSTOPTS:
1233: case IPPROTO_ROUTING:
1234: case IPPROTO_HOPOPTS:
1235: case IPPROTO_AH: /* is it possible? */
1236: break;
1237: default:
1238: goto loopend;
1239: }
1240:
1241: ext = ip6_pullexthdr(m, off, nxt);
1242: if (ext == NULL) {
1.116 thorpej 1243: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1244: return;
1245: }
1.62 itojun 1246: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1247: if (nxt == IPPROTO_AH)
1248: elen = (ip6e->ip6e_len + 2) << 2;
1249: else
1250: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1251: if (elen != ext->m_len) {
1252: m_freem(ext);
1.116 thorpej 1253: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1254: return;
1255: }
1.57 thorpej 1256: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1257:
1.35 itojun 1258: switch (nxt) {
1.62 itojun 1259: case IPPROTO_DSTOPTS:
1.122.4.1! bouyer 1260: if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35 itojun 1261: break;
1262:
1.97 christos 1263: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1264: IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1265: IPPROTO_IPV6);
1.35 itojun 1266: if (*mp)
1267: mp = &(*mp)->m_next;
1268: break;
1269:
1270: case IPPROTO_ROUTING:
1.122.4.1! bouyer 1271: if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35 itojun 1272: break;
1273:
1.97 christos 1274: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1275: IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1276: IPPROTO_IPV6);
1.35 itojun 1277: if (*mp)
1278: mp = &(*mp)->m_next;
1279: break;
1280:
1.62 itojun 1281: case IPPROTO_HOPOPTS:
1282: case IPPROTO_AH: /* is it possible? */
1283: break;
1284:
1.35 itojun 1285: default:
1286: /*
1.62 itojun 1287: * other cases have been filtered in the above.
1288: * none will visit this case. here we supply
1289: * the code just in case (nxt overwritten or
1290: * other cases).
1.35 itojun 1291: */
1.62 itojun 1292: m_freem(ext);
1.35 itojun 1293: goto loopend;
1294:
1.2 itojun 1295: }
1296:
1297: /* proceed with the next header. */
1.9 itojun 1298: off += elen;
1.2 itojun 1299: nxt = ip6e->ip6e_nxt;
1.62 itojun 1300: ip6e = NULL;
1301: m_freem(ext);
1302: ext = NULL;
1.2 itojun 1303: }
1304: loopend:
1.62 itojun 1305: ;
1.2 itojun 1306: }
1.62 itojun 1307: }
1.85 rpaulo 1308: #undef IS2292
1309:
1310:
1311: void
1.95 dyoung 1312: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1313: uint32_t *mtu)
1.85 rpaulo 1314: {
1315: struct socket *so;
1316: struct mbuf *m_mtu;
1317: struct ip6_mtuinfo mtuctl;
1318:
1319: so = in6p->in6p_socket;
1320:
1321: if (mtu == NULL)
1322: return;
1323:
1324: #ifdef DIAGNOSTIC
1325: if (so == NULL) /* I believe this is impossible */
1326: panic("ip6_notify_pmtu: socket is NULL");
1327: #endif
1328:
1329: memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1330: mtuctl.ip6m_mtu = *mtu;
1331: mtuctl.ip6m_addr = *dst;
1332: if (sa6_recoverscope(&mtuctl.ip6m_addr))
1333: return;
1334:
1.97 christos 1335: if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85 rpaulo 1336: IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1337: return;
1338:
1.95 dyoung 1339: if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85 rpaulo 1340: == 0) {
1341: m_freem(m_mtu);
1342: /* XXX: should count statistics */
1343: } else
1344: sorwakeup(so);
1345:
1346: return;
1347: }
1.62 itojun 1348:
1349: /*
1350: * pull single extension header from mbuf chain. returns single mbuf that
1351: * contains the result, or NULL on error.
1352: */
1353: static struct mbuf *
1.107 christos 1354: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62 itojun 1355: {
1356: struct ip6_ext ip6e;
1357: size_t elen;
1358: struct mbuf *n;
1359:
1360: #ifdef DIAGNOSTIC
1361: switch (nxt) {
1362: case IPPROTO_DSTOPTS:
1363: case IPPROTO_ROUTING:
1364: case IPPROTO_HOPOPTS:
1365: case IPPROTO_AH: /* is it possible? */
1366: break;
1367: default:
1368: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1369: }
1.62 itojun 1370: #endif
1.2 itojun 1371:
1.97 christos 1372: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62 itojun 1373: if (nxt == IPPROTO_AH)
1374: elen = (ip6e.ip6e_len + 2) << 2;
1375: else
1376: elen = (ip6e.ip6e_len + 1) << 3;
1377:
1378: MGET(n, M_DONTWAIT, MT_DATA);
1379: if (n && elen >= MLEN) {
1380: MCLGET(n, M_DONTWAIT);
1381: if ((n->m_flags & M_EXT) == 0) {
1382: m_free(n);
1383: n = NULL;
1384: }
1385: }
1386: if (!n)
1387: return NULL;
1388:
1389: n->m_len = 0;
1390: if (elen >= M_TRAILINGSPACE(n)) {
1391: m_free(n);
1392: return NULL;
1393: }
1394:
1.97 christos 1395: m_copydata(m, off, elen, mtod(n, void *));
1.62 itojun 1396: n->m_len = elen;
1397: return n;
1.2 itojun 1398: }
1399:
1400: /*
1401: * Get pointer to the previous header followed by the header
1402: * currently processed.
1403: * XXX: This function supposes that
1404: * M includes all headers,
1405: * the next header field and the header length field of each header
1406: * are valid, and
1407: * the sum of each header length equals to OFF.
1408: * Because of these assumptions, this function must be called very
1409: * carefully. Moreover, it will not be used in the near future when
1410: * we develop `neater' mechanism to process extension headers.
1411: */
1.58 itojun 1412: u_int8_t *
1.107 christos 1413: ip6_get_prevhdr(struct mbuf *m, int off)
1.2 itojun 1414: {
1415: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1416:
1417: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1418: return (&ip6->ip6_nxt);
1.2 itojun 1419: else {
1420: int len, nxt;
1421: struct ip6_ext *ip6e = NULL;
1422:
1423: nxt = ip6->ip6_nxt;
1424: len = sizeof(struct ip6_hdr);
1425: while (len < off) {
1.97 christos 1426: ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2 itojun 1427:
1.35 itojun 1428: switch (nxt) {
1.2 itojun 1429: case IPPROTO_FRAGMENT:
1430: len += sizeof(struct ip6_frag);
1431: break;
1432: case IPPROTO_AH:
1433: len += (ip6e->ip6e_len + 2) << 2;
1434: break;
1435: default:
1436: len += (ip6e->ip6e_len + 1) << 3;
1437: break;
1438: }
1439: nxt = ip6e->ip6e_nxt;
1440: }
1441: if (ip6e)
1.58 itojun 1442: return (&ip6e->ip6e_nxt);
1.2 itojun 1443: else
1444: return NULL;
1.18 itojun 1445: }
1446: }
1447:
1448: /*
1449: * get next header offset. m will be retained.
1450: */
1451: int
1.107 christos 1452: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1453: {
1454: struct ip6_hdr ip6;
1455: struct ip6_ext ip6e;
1456: struct ip6_frag fh;
1457:
1458: /* just in case */
1459: if (m == NULL)
1460: panic("ip6_nexthdr: m == NULL");
1461: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1462: return -1;
1463:
1464: switch (proto) {
1465: case IPPROTO_IPV6:
1.83 rpaulo 1466: /* do not chase beyond intermediate IPv6 headers */
1467: if (off != 0)
1468: return -1;
1.18 itojun 1469: if (m->m_pkthdr.len < off + sizeof(ip6))
1470: return -1;
1.97 christos 1471: m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18 itojun 1472: if (nxtp)
1473: *nxtp = ip6.ip6_nxt;
1474: off += sizeof(ip6);
1475: return off;
1476:
1477: case IPPROTO_FRAGMENT:
1478: /*
1479: * terminate parsing if it is not the first fragment,
1480: * it does not make sense to parse through it.
1481: */
1482: if (m->m_pkthdr.len < off + sizeof(fh))
1483: return -1;
1.97 christos 1484: m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67 itojun 1485: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1486: return -1;
1487: if (nxtp)
1488: *nxtp = fh.ip6f_nxt;
1489: off += sizeof(struct ip6_frag);
1490: return off;
1491:
1492: case IPPROTO_AH:
1493: if (m->m_pkthdr.len < off + sizeof(ip6e))
1494: return -1;
1.97 christos 1495: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1496: if (nxtp)
1497: *nxtp = ip6e.ip6e_nxt;
1498: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1499: if (m->m_pkthdr.len < off)
1500: return -1;
1.18 itojun 1501: return off;
1502:
1503: case IPPROTO_HOPOPTS:
1504: case IPPROTO_ROUTING:
1505: case IPPROTO_DSTOPTS:
1506: if (m->m_pkthdr.len < off + sizeof(ip6e))
1507: return -1;
1.97 christos 1508: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1509: if (nxtp)
1510: *nxtp = ip6e.ip6e_nxt;
1511: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1512: if (m->m_pkthdr.len < off)
1513: return -1;
1.18 itojun 1514: return off;
1515:
1516: case IPPROTO_NONE:
1517: case IPPROTO_ESP:
1518: case IPPROTO_IPCOMP:
1519: /* give up */
1520: return -1;
1521:
1522: default:
1523: return -1;
1524: }
1525: }
1526:
1527: /*
1528: * get offset for the last header in the chain. m will be kept untainted.
1529: */
1530: int
1.107 christos 1531: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1532: {
1533: int newoff;
1534: int nxt;
1535:
1536: if (!nxtp) {
1537: nxt = -1;
1538: nxtp = &nxt;
1539: }
1.86 rpaulo 1540: for (;;) {
1.18 itojun 1541: newoff = ip6_nexthdr(m, off, proto, nxtp);
1542: if (newoff < 0)
1543: return off;
1544: else if (newoff < off)
1545: return -1; /* invalid */
1546: else if (newoff == off)
1547: return newoff;
1548:
1549: off = newoff;
1550: proto = *nxtp;
1.2 itojun 1551: }
1552: }
1553:
1.81 rpaulo 1554: struct m_tag *
1.107 christos 1555: ip6_addaux(struct mbuf *m)
1.81 rpaulo 1556: {
1557: struct m_tag *mtag;
1558:
1559: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1560: if (!mtag) {
1561: mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1562: M_NOWAIT);
1563: if (mtag) {
1564: m_tag_prepend(m, mtag);
1565: bzero(mtag + 1, sizeof(struct ip6aux));
1566: }
1567: }
1568: return mtag;
1569: }
1570:
1571: struct m_tag *
1.107 christos 1572: ip6_findaux(struct mbuf *m)
1.81 rpaulo 1573: {
1574: struct m_tag *mtag;
1575:
1576: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1577: return mtag;
1578: }
1579:
1580: void
1.107 christos 1581: ip6_delaux(struct mbuf *m)
1.81 rpaulo 1582: {
1583: struct m_tag *mtag;
1584:
1585: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1586: if (mtag)
1587: m_tag_delete(m, mtag);
1588: }
1589:
1.98 liamjfoy 1590: #ifdef GATEWAY
1591: /*
1592: * sysctl helper routine for net.inet.ip6.maxflows. Since
1593: * we could reduce this value, call ip6flow_reap();
1594: */
1595: static int
1.101 liamjfoy 1596: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98 liamjfoy 1597: {
1.121 simonb 1598: int error;
1.98 liamjfoy 1599:
1.121 simonb 1600: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1601: if (error || newp == NULL)
1602: return (error);
1.98 liamjfoy 1603:
1.121 simonb 1604: mutex_enter(softnet_lock);
1.122 matt 1605: KERNEL_LOCK(1, NULL);
1.120 matt 1606:
1.121 simonb 1607: ip6flow_reap(0);
1.120 matt 1608:
1609: KERNEL_UNLOCK_ONE(NULL);
1.121 simonb 1610: mutex_exit(softnet_lock);
1.98 liamjfoy 1611:
1.121 simonb 1612: return (0);
1.98 liamjfoy 1613: }
1.99 liamjfoy 1614:
1615: static int
1616: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1617: {
1618: int error, tmp;
1619: struct sysctlnode node;
1620:
1621: node = *rnode;
1622: tmp = ip6_hashsize;
1623: node.sysctl_data = &tmp;
1624: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1625: if (error || newp == NULL)
1626: return (error);
1627:
1628: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1629: /*
1630: * Can only fail due to malloc()
1631: */
1.120 matt 1632: mutex_enter(softnet_lock);
1.122 matt 1633: KERNEL_LOCK(1, NULL);
1.120 matt 1634:
1635: error = ip6flow_invalidate_all(tmp);
1636:
1637: KERNEL_UNLOCK_ONE(NULL);
1638: mutex_exit(softnet_lock);
1.99 liamjfoy 1639: } else {
1640: /*
1641: * EINVAL if not a power of 2
1.121 simonb 1642: */
1.120 matt 1643: error = EINVAL;
1.99 liamjfoy 1644: }
1645:
1.120 matt 1646: return error;
1.99 liamjfoy 1647: }
1.98 liamjfoy 1648: #endif /* GATEWAY */
1649:
1.2 itojun 1650: /*
1651: * System control for IP6
1652: */
1653:
1.120 matt 1654: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2 itojun 1655: 0, 0, 0, 0,
1656: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1657: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1658: EMSGSIZE, EHOSTUNREACH, 0, 0,
1659: 0, 0, 0, 0,
1660: ENOPROTOOPT
1661: };
1662:
1.116 thorpej 1663: static int
1664: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1665: {
1666:
1.119 thorpej 1667: return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116 thorpej 1668: }
1669:
1.70 atatat 1670: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2 itojun 1671: {
1.85 rpaulo 1672: #ifdef RFC2292
1673: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1674: #else
1675: #define IS2292(x, y) (y)
1676: #endif
1.26 itojun 1677:
1.73 atatat 1678: sysctl_createv(clog, 0, NULL, NULL,
1679: CTLFLAG_PERMANENT,
1.70 atatat 1680: CTLTYPE_NODE, "net", NULL,
1681: NULL, 0, NULL, 0,
1682: CTL_NET, CTL_EOL);
1.73 atatat 1683: sysctl_createv(clog, 0, NULL, NULL,
1684: CTLFLAG_PERMANENT,
1.74 atatat 1685: CTLTYPE_NODE, "inet6",
1686: SYSCTL_DESCR("PF_INET6 related settings"),
1.70 atatat 1687: NULL, 0, NULL, 0,
1688: CTL_NET, PF_INET6, CTL_EOL);
1.73 atatat 1689: sysctl_createv(clog, 0, NULL, NULL,
1690: CTLFLAG_PERMANENT,
1.74 atatat 1691: CTLTYPE_NODE, "ip6",
1692: SYSCTL_DESCR("IPv6 related settings"),
1.70 atatat 1693: NULL, 0, NULL, 0,
1694: CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1695:
1.73 atatat 1696: sysctl_createv(clog, 0, NULL, NULL,
1697: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1698: CTLTYPE_INT, "forwarding",
1699: SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70 atatat 1700: NULL, 0, &ip6_forwarding, 0,
1701: CTL_NET, PF_INET6, IPPROTO_IPV6,
1702: IPV6CTL_FORWARDING, CTL_EOL);
1.73 atatat 1703: sysctl_createv(clog, 0, NULL, NULL,
1704: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1705: CTLTYPE_INT, "redirect",
1706: SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70 atatat 1707: NULL, 0, &ip6_sendredirects, 0,
1708: CTL_NET, PF_INET6, IPPROTO_IPV6,
1709: IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73 atatat 1710: sysctl_createv(clog, 0, NULL, NULL,
1711: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1712: CTLTYPE_INT, "hlim",
1713: SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70 atatat 1714: NULL, 0, &ip6_defhlim, 0,
1715: CTL_NET, PF_INET6, IPPROTO_IPV6,
1716: IPV6CTL_DEFHLIM, CTL_EOL);
1717: #ifdef notyet
1.73 atatat 1718: sysctl_createv(clog, 0, NULL, NULL,
1719: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1720: CTLTYPE_INT, "mtu", NULL,
1721: NULL, 0, &, 0,
1722: CTL_NET, PF_INET6, IPPROTO_IPV6,
1723: IPV6CTL_DEFMTU, CTL_EOL);
1724: #endif
1725: #ifdef __no_idea__
1.73 atatat 1726: sysctl_createv(clog, 0, NULL, NULL,
1727: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1728: CTLTYPE_INT, "forwsrcrt", NULL,
1729: NULL, 0, &?, 0,
1730: CTL_NET, PF_INET6, IPPROTO_IPV6,
1731: IPV6CTL_FORWSRCRT, CTL_EOL);
1.73 atatat 1732: sysctl_createv(clog, 0, NULL, NULL,
1733: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1734: CTLTYPE_STRUCT, "mrtstats", NULL,
1735: NULL, 0, &?, sizeof(?),
1736: CTL_NET, PF_INET6, IPPROTO_IPV6,
1737: IPV6CTL_MRTSTATS, CTL_EOL);
1.73 atatat 1738: sysctl_createv(clog, 0, NULL, NULL,
1739: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1740: CTLTYPE_?, "mrtproto", NULL,
1741: NULL, 0, &?, sizeof(?),
1742: CTL_NET, PF_INET6, IPPROTO_IPV6,
1743: IPV6CTL_MRTPROTO, CTL_EOL);
1744: #endif
1.73 atatat 1745: sysctl_createv(clog, 0, NULL, NULL,
1746: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1747: CTLTYPE_INT, "maxfragpackets",
1748: SYSCTL_DESCR("Maximum number of fragments to buffer "
1749: "for reassembly"),
1.70 atatat 1750: NULL, 0, &ip6_maxfragpackets, 0,
1751: CTL_NET, PF_INET6, IPPROTO_IPV6,
1752: IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1753: #ifdef __no_idea__
1.73 atatat 1754: sysctl_createv(clog, 0, NULL, NULL,
1755: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1756: CTLTYPE_INT, "sourcecheck", NULL,
1757: NULL, 0, &?, 0,
1758: CTL_NET, PF_INET6, IPPROTO_IPV6,
1759: IPV6CTL_SOURCECHECK, CTL_EOL);
1.73 atatat 1760: sysctl_createv(clog, 0, NULL, NULL,
1761: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1762: CTLTYPE_INT, "sourcecheck_logint", NULL,
1763: NULL, 0, &?, 0,
1764: CTL_NET, PF_INET6, IPPROTO_IPV6,
1765: IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1766: #endif
1.73 atatat 1767: sysctl_createv(clog, 0, NULL, NULL,
1768: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1769: CTLTYPE_INT, "accept_rtadv",
1770: SYSCTL_DESCR("Accept router advertisements"),
1.70 atatat 1771: NULL, 0, &ip6_accept_rtadv, 0,
1772: CTL_NET, PF_INET6, IPPROTO_IPV6,
1773: IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73 atatat 1774: sysctl_createv(clog, 0, NULL, NULL,
1775: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1776: CTLTYPE_INT, "keepfaith",
1777: SYSCTL_DESCR("Activate faith interface"),
1.70 atatat 1778: NULL, 0, &ip6_keepfaith, 0,
1779: CTL_NET, PF_INET6, IPPROTO_IPV6,
1780: IPV6CTL_KEEPFAITH, CTL_EOL);
1.73 atatat 1781: sysctl_createv(clog, 0, NULL, NULL,
1782: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1783: CTLTYPE_INT, "log_interval",
1784: SYSCTL_DESCR("Minumum interval between logging "
1785: "unroutable packets"),
1.70 atatat 1786: NULL, 0, &ip6_log_interval, 0,
1787: CTL_NET, PF_INET6, IPPROTO_IPV6,
1788: IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73 atatat 1789: sysctl_createv(clog, 0, NULL, NULL,
1790: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1791: CTLTYPE_INT, "hdrnestlimit",
1792: SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70 atatat 1793: NULL, 0, &ip6_hdrnestlimit, 0,
1794: CTL_NET, PF_INET6, IPPROTO_IPV6,
1795: IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73 atatat 1796: sysctl_createv(clog, 0, NULL, NULL,
1797: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1798: CTLTYPE_INT, "dad_count",
1799: SYSCTL_DESCR("Number of Duplicate Address Detection "
1800: "probes to send"),
1.70 atatat 1801: NULL, 0, &ip6_dad_count, 0,
1802: CTL_NET, PF_INET6, IPPROTO_IPV6,
1803: IPV6CTL_DAD_COUNT, CTL_EOL);
1.73 atatat 1804: sysctl_createv(clog, 0, NULL, NULL,
1805: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1806: CTLTYPE_INT, "auto_flowlabel",
1807: SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70 atatat 1808: NULL, 0, &ip6_auto_flowlabel, 0,
1809: CTL_NET, PF_INET6, IPPROTO_IPV6,
1810: IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73 atatat 1811: sysctl_createv(clog, 0, NULL, NULL,
1812: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1813: CTLTYPE_INT, "defmcasthlim",
1814: SYSCTL_DESCR("Default multicast hop limit"),
1.70 atatat 1815: NULL, 0, &ip6_defmcasthlim, 0,
1816: CTL_NET, PF_INET6, IPPROTO_IPV6,
1817: IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51 itojun 1818: #if NGIF > 0
1.73 atatat 1819: sysctl_createv(clog, 0, NULL, NULL,
1820: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1821: CTLTYPE_INT, "gifhlim",
1822: SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70 atatat 1823: NULL, 0, &ip6_gif_hlim, 0,
1824: CTL_NET, PF_INET6, IPPROTO_IPV6,
1825: IPV6CTL_GIF_HLIM, CTL_EOL);
1826: #endif /* NGIF */
1.73 atatat 1827: sysctl_createv(clog, 0, NULL, NULL,
1828: CTLFLAG_PERMANENT,
1.74 atatat 1829: CTLTYPE_STRING, "kame_version",
1830: SYSCTL_DESCR("KAME Version"),
1.78 christos 1831: NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70 atatat 1832: CTL_NET, PF_INET6, IPPROTO_IPV6,
1833: IPV6CTL_KAME_VERSION, CTL_EOL);
1.73 atatat 1834: sysctl_createv(clog, 0, NULL, NULL,
1835: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1836: CTLTYPE_INT, "use_deprecated",
1837: SYSCTL_DESCR("Allow use of deprecated addresses as "
1838: "source addresses"),
1.70 atatat 1839: NULL, 0, &ip6_use_deprecated, 0,
1840: CTL_NET, PF_INET6, IPPROTO_IPV6,
1841: IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73 atatat 1842: sysctl_createv(clog, 0, NULL, NULL,
1843: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1844: CTLTYPE_INT, "rr_prune", NULL,
1845: NULL, 0, &ip6_rr_prune, 0,
1846: CTL_NET, PF_INET6, IPPROTO_IPV6,
1847: IPV6CTL_RR_PRUNE, CTL_EOL);
1.73 atatat 1848: sysctl_createv(clog, 0, NULL, NULL,
1849: CTLFLAG_PERMANENT
1.70 atatat 1850: #ifndef INET6_BINDV6ONLY
1.73 atatat 1851: |CTLFLAG_READWRITE,
1.70 atatat 1852: #endif
1.74 atatat 1853: CTLTYPE_INT, "v6only",
1854: SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1855: "to PF_INET sockets"),
1.70 atatat 1856: NULL, 0, &ip6_v6only, 0,
1857: CTL_NET, PF_INET6, IPPROTO_IPV6,
1858: IPV6CTL_V6ONLY, CTL_EOL);
1.73 atatat 1859: sysctl_createv(clog, 0, NULL, NULL,
1860: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1861: CTLTYPE_INT, "anonportmin",
1862: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70 atatat 1863: sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1864: CTL_NET, PF_INET6, IPPROTO_IPV6,
1865: IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73 atatat 1866: sysctl_createv(clog, 0, NULL, NULL,
1867: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1868: CTLTYPE_INT, "anonportmax",
1869: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70 atatat 1870: sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1871: CTL_NET, PF_INET6, IPPROTO_IPV6,
1872: IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26 itojun 1873: #ifndef IPNOPRIVPORTS
1.73 atatat 1874: sysctl_createv(clog, 0, NULL, NULL,
1875: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1876: CTLTYPE_INT, "lowportmin",
1877: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1878: "to assign"),
1.70 atatat 1879: sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1880: CTL_NET, PF_INET6, IPPROTO_IPV6,
1881: IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73 atatat 1882: sysctl_createv(clog, 0, NULL, NULL,
1883: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1884: CTLTYPE_INT, "lowportmax",
1885: SYSCTL_DESCR("Highest privileged ephemeral port number "
1886: "to assign"),
1.70 atatat 1887: sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1888: CTL_NET, PF_INET6, IPPROTO_IPV6,
1889: IPV6CTL_LOWPORTMAX, CTL_EOL);
1890: #endif /* IPNOPRIVPORTS */
1.73 atatat 1891: sysctl_createv(clog, 0, NULL, NULL,
1892: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83 rpaulo 1893: CTLTYPE_INT, "use_tempaddr",
1894: SYSCTL_DESCR("Use temporary address"),
1895: NULL, 0, &ip6_use_tempaddr, 0,
1896: CTL_NET, PF_INET6, IPPROTO_IPV6,
1897: CTL_CREATE, CTL_EOL);
1898: sysctl_createv(clog, 0, NULL, NULL,
1899: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1900: CTLTYPE_INT, "temppltime",
1901: SYSCTL_DESCR("preferred lifetime of a temporary address"),
1902: NULL, 0, &ip6_temp_preferred_lifetime, 0,
1903: CTL_NET, PF_INET6, IPPROTO_IPV6,
1904: CTL_CREATE, CTL_EOL);
1905: sysctl_createv(clog, 0, NULL, NULL,
1906: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1907: CTLTYPE_INT, "tempvltime",
1908: SYSCTL_DESCR("valid lifetime of a temporary address"),
1909: NULL, 0, &ip6_temp_valid_lifetime, 0,
1910: CTL_NET, PF_INET6, IPPROTO_IPV6,
1911: CTL_CREATE, CTL_EOL);
1912: sysctl_createv(clog, 0, NULL, NULL,
1913: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1914: CTLTYPE_INT, "maxfrags",
1915: SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70 atatat 1916: NULL, 0, &ip6_maxfrags, 0,
1917: CTL_NET, PF_INET6, IPPROTO_IPV6,
1918: IPV6CTL_MAXFRAGS, CTL_EOL);
1.79 rpaulo 1919: sysctl_createv(clog, 0, NULL, NULL,
1920: CTLFLAG_PERMANENT,
1921: CTLTYPE_STRUCT, "stats",
1922: SYSCTL_DESCR("IPv6 statistics"),
1.116 thorpej 1923: sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79 rpaulo 1924: CTL_NET, PF_INET6, IPPROTO_IPV6,
1925: IPV6CTL_STATS, CTL_EOL);
1.81 rpaulo 1926: sysctl_createv(clog, 0, NULL, NULL,
1927: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1928: CTLTYPE_INT, "use_defaultzone",
1929: SYSCTL_DESCR("Whether to use the default scope zones"),
1930: NULL, 0, &ip6_use_defzone, 0,
1931: CTL_NET, PF_INET6, IPPROTO_IPV6,
1932: IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83 rpaulo 1933: sysctl_createv(clog, 0, NULL, NULL,
1934: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1935: CTLTYPE_INT, "mcast_pmtu",
1936: SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1937: NULL, 0, &ip6_mcast_pmtu, 0,
1938: CTL_NET, PF_INET6, IPPROTO_IPV6,
1939: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1940: #ifdef GATEWAY
1941: sysctl_createv(clog, 0, NULL, NULL,
1942: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1943: CTLTYPE_INT, "maxflows",
1944: SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101 liamjfoy 1945: sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98 liamjfoy 1946: CTL_NET, PF_INET6, IPPROTO_IPV6,
1947: CTL_CREATE, CTL_EOL);
1.99 liamjfoy 1948: sysctl_createv(clog, 0, NULL, NULL,
1949: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1950: CTLTYPE_INT, "hashsize",
1951: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1952: sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1953: CTL_NET, PF_INET6, IPPROTO_IPV6,
1954: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1955: #endif
1.2 itojun 1956: }
1.116 thorpej 1957:
1958: void
1959: ip6_statinc(u_int stat)
1960: {
1961:
1962: KASSERT(stat < IP6_NSTATS);
1963: IP6_STATINC(stat);
1964: }
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