Annotation of src/sys/netinet6/ip6_input.c, Revision 1.117
1.117 ! thorpej 1: /* $NetBSD: ip6_input.c,v 1.116 2008/04/15 03:57:04 thorpej 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>
1.117 ! thorpej 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.116 2008/04/15 03:57:04 thorpej 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"
1.2 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 */
1.108 ad 209: callout_init(&nd6_timer_ch, 0);
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 */
1.108 ad 213: callout_init(&in6_tmpaddrtimer_ch, 0);
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:
229: for (;;) {
1.41 thorpej 230: s = splnet();
1.2 itojun 231: IF_DEQUEUE(&ip6intrq, m);
232: splx(s);
233: if (m == 0)
234: return;
1.83 rpaulo 235: /* drop the packet if IPv6 operation is disabled on the IF */
236: if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
237: m_freem(m);
238: return;
239: }
1.2 itojun 240: ip6_input(m);
241: }
242: }
243:
1.103 dyoung 244: extern struct route ip6_forward_rt;
1.2 itojun 245:
246: void
1.96 dyoung 247: ip6_input(struct mbuf *m)
1.2 itojun 248: {
1.9 itojun 249: struct ip6_hdr *ip6;
1.105 dyoung 250: int hit, off = sizeof(struct ip6_hdr), nest;
1.2 itojun 251: u_int32_t plen;
1.5 itojun 252: u_int32_t rtalert = ~0;
1.104 yamt 253: int nxt, ours = 0, rh_present = 0;
1.9 itojun 254: struct ifnet *deliverifp = NULL;
1.64 itojun 255: int srcrt = 0;
1.105 dyoung 256: const struct rtentry *rt;
257: union {
258: struct sockaddr dst;
259: struct sockaddr_in6 dst6;
260: } u;
1.94 degroote 261: #ifdef FAST_IPSEC
262: struct m_tag *mtag;
263: struct tdb_ident *tdbi;
264: struct secpolicy *sp;
265: int s, error;
266: #endif
1.2 itojun 267:
268: #ifdef IPSEC
269: /*
270: * should the inner packet be considered authentic?
271: * see comment in ah4_input().
272: */
1.49 itojun 273: m->m_flags &= ~M_AUTHIPHDR;
274: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 275: #endif
1.9 itojun 276:
1.2 itojun 277: /*
1.81 rpaulo 278: * make sure we don't have onion peering information into m_tag.
279: */
280: ip6_delaux(m);
281:
282: /*
1.44 itojun 283: * mbuf statistics
1.2 itojun 284: */
285: if (m->m_flags & M_EXT) {
286: if (m->m_next)
1.116 thorpej 287: IP6_STATINC(IP6_STAT_MEXT2M);
1.2 itojun 288: else
1.116 thorpej 289: IP6_STATINC(IP6_STAT_MEXT1);
1.2 itojun 290: } else {
1.115 thorpej 291: #define M2MMAX 32
1.2 itojun 292: if (m->m_next) {
1.9 itojun 293: if (m->m_flags & M_LOOP) {
1.116 thorpej 294: /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115 thorpej 295: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116 thorpej 296: IP6_STATINC(IP6_STAT_M2M +
297: m->m_pkthdr.rcvif->if_index);
1.115 thorpej 298: } else
1.116 thorpej 299: IP6_STATINC(IP6_STAT_M2M);
1.2 itojun 300: } else
1.116 thorpej 301: IP6_STATINC(IP6_STAT_M1);
1.40 itojun 302: #undef M2MMAX
1.2 itojun 303: }
304:
1.9 itojun 305: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116 thorpej 306: IP6_STATINC(IP6_STAT_TOTAL);
1.9 itojun 307:
1.57 thorpej 308: /*
309: * If the IPv6 header is not aligned, slurp it up into a new
310: * mbuf with space for link headers, in the event we forward
1.81 rpaulo 311: * it. Otherwise, if it is aligned, make sure the entire base
1.57 thorpej 312: * IPv6 header is in the first mbuf of the chain.
313: */
1.97 christos 314: if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57 thorpej 315: struct ifnet *inifp = m->m_pkthdr.rcvif;
316: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
317: (max_linkhdr + 3) & ~3)) == NULL) {
318: /* XXXJRT new stat, please */
1.116 thorpej 319: IP6_STATINC(IP6_STAT_TOOSMALL);
1.57 thorpej 320: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
321: return;
322: }
323: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
324: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 325: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116 thorpej 326: IP6_STATINC(IP6_STAT_TOOSMALL);
1.9 itojun 327: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
328: return;
329: }
1.2 itojun 330: }
331:
332: ip6 = mtod(m, struct ip6_hdr *);
333:
334: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116 thorpej 335: IP6_STATINC(IP6_STAT_BADVERS);
1.9 itojun 336: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 337: goto bad;
338: }
1.15 darrenr 339:
1.98 liamjfoy 340: #if defined(IPSEC)
341: /* IPv6 fast forwarding is not compatible with IPsec. */
342: m->m_flags &= ~M_CANFASTFWD;
343: #else
344: /*
345: * Assume that we can create a fast-forward IP flow entry
346: * based on this packet.
347: */
348: m->m_flags |= M_CANFASTFWD;
349: #endif
350:
1.15 darrenr 351: #ifdef PFIL_HOOKS
352: /*
353: * Run through list of hooks for input packets. If there are any
354: * filters which require that additional packets in the flow are
355: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
356: * Note that filters must _never_ set this flag, as another filter
357: * in the list may have previously cleared it.
358: */
1.39 itojun 359: /*
360: * let ipfilter look at packet on the wire,
361: * not the decapsulated packet.
362: */
363: #ifdef IPSEC
1.42 itojun 364: if (!ipsec_getnhist(m))
1.94 degroote 365: #elif defined(FAST_IPSEC)
366: if (!ipsec_indone(m))
1.39 itojun 367: #else
368: if (1)
369: #endif
370: {
1.64 itojun 371: struct in6_addr odst;
372:
373: odst = ip6->ip6_dst;
1.39 itojun 374: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
375: PFIL_IN) != 0)
376: return;
377: if (m == NULL)
378: return;
379: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 380: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 381: }
1.15 darrenr 382: #endif /* PFIL_HOOKS */
383:
1.116 thorpej 384: IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2 itojun 385:
1.30 thorpej 386: #ifdef ALTQ
387: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
388: /* packet is dropped by traffic conditioner */
389: return;
1.9 itojun 390: }
391: #endif
392:
1.2 itojun 393: /*
1.44 itojun 394: * Check against address spoofing/corruption.
1.2 itojun 395: */
396: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
397: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 398: /*
399: * XXX: "badscope" is not very suitable for a multicast source.
400: */
1.116 thorpej 401: IP6_STATINC(IP6_STAT_BADSCOPE);
1.9 itojun 402: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 403: goto bad;
404: }
1.13 itojun 405: /*
1.44 itojun 406: * The following check is not documented in specs. A malicious
407: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
408: * and bypass security checks (act as if it was from 127.0.0.1 by using
409: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 410: *
1.44 itojun 411: * This check chokes if we are in an SIIT cloud. As none of BSDs
412: * support IPv4-less kernel compilation, we cannot support SIIT
413: * environment at all. So, it makes more sense for us to reject any
414: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 415: * partial support for SIIT environment.
1.13 itojun 416: */
417: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
418: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 419: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 420: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
421: goto bad;
422: }
1.17 itojun 423: #if 0
1.13 itojun 424: /*
1.17 itojun 425: * Reject packets with IPv4 compatible addresses (auto tunnel).
426: *
427: * The code forbids auto tunnel relay case in RFC1933 (the check is
428: * stronger than RFC1933). We may want to re-enable it if mech-xx
429: * is revised to forbid relaying case.
1.13 itojun 430: */
431: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
432: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116 thorpej 433: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 434: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
435: goto bad;
436: }
437: #endif
1.35 itojun 438:
1.2 itojun 439: /*
1.82 yamt 440: * Disambiguate address scope zones (if there is ambiguity).
441: * We first make sure that the original source or destination address
442: * is not in our internal form for scoped addresses. Such addresses
443: * are not necessarily invalid spec-wise, but we cannot accept them due
444: * to the usage conflict.
445: * in6_setscope() then also checks and rejects the cases where src or
446: * dst are the loopback address and the receiving interface
447: * is not loopback.
448: */
1.88 bouyer 449: if (__predict_false(
450: m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
451: goto bad;
452: ip6 = mtod(m, struct ip6_hdr *);
1.82 yamt 453: if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116 thorpej 454: IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82 yamt 455: goto bad;
456: }
457: if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
458: in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116 thorpej 459: IP6_STATINC(IP6_STAT_BADSCOPE);
1.82 yamt 460: goto bad;
461: }
462:
463: /*
1.2 itojun 464: * Multicast check
465: */
466: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
467: struct in6_multi *in6m = 0;
1.9 itojun 468:
469: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 470: /*
471: * See if we belong to the destination multicast group on the
472: * arrival interface.
473: */
474: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
475: if (in6m)
476: ours = 1;
477: else if (!ip6_mrouter) {
1.116 thorpej 478: uint64_t *ip6s = IP6_STAT_GETREF();
479: ip6s[IP6_STAT_NOTMEMBER]++;
480: ip6s[IP6_STAT_CANTFORWARD]++;
481: IP6_STAT_PUTREF();
1.9 itojun 482: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 483: goto bad;
484: }
1.9 itojun 485: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 486: goto hbhcheck;
487: }
488:
1.105 dyoung 489: sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
490:
1.2 itojun 491: /*
492: * Unicast check
493: */
1.105 dyoung 494: rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
495: if (hit)
1.116 thorpej 496: IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93 joerg 497: else
1.116 thorpej 498: IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22 itojun 499:
1.109 dyoung 500: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2 itojun 501:
502: /*
503: * Accept the packet if the forwarding interface to the destination
504: * according to the routing table is the loopback interface,
505: * unless the associated route has a gateway.
506: * Note that this approach causes to accept a packet if there is a
507: * route to the loopback interface for the destination of the packet.
508: * But we think it's even useful in some situations, e.g. when using
509: * a special daemon which wants to intercept the packet.
510: */
1.105 dyoung 511: if (rt != NULL &&
512: (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
513: !(rt->rt_flags & RTF_CLONED) &&
1.2 itojun 514: #if 0
515: /*
516: * The check below is redundant since the comparison of
517: * the destination and the key of the rtentry has
518: * already done through looking up the routing table.
519: */
1.109 dyoung 520: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2 itojun 521: #endif
1.105 dyoung 522: rt->rt_ifp->if_type == IFT_LOOP) {
523: struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2 itojun 524: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
525: m->m_flags |= M_ANYCAST6;
1.24 itojun 526: /*
527: * packets to a tentative, duplicated, or somehow invalid
528: * address must not be accepted.
529: */
1.2 itojun 530: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 531: /* this address is ready */
1.2 itojun 532: ours = 1;
1.9 itojun 533: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 534: goto hbhcheck;
535: } else {
1.24 itojun 536: /* address is not ready, so discard the packet. */
1.34 itojun 537: nd6log((LOG_INFO,
1.27 itojun 538: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 539: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 540: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 541:
542: goto bad;
1.2 itojun 543: }
544: }
545:
546: /*
1.55 itojun 547: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 548: */
549: #if defined(NFAITH) && 0 < NFAITH
550: if (ip6_keepfaith) {
1.105 dyoung 551: if (rt != NULL && rt->rt_ifp != NULL &&
552: rt->rt_ifp->if_type == IFT_FAITH) {
1.2 itojun 553: /* XXX do we need more sanity checks? */
554: ours = 1;
1.105 dyoung 555: deliverifp = rt->rt_ifp; /* faith */
1.9 itojun 556: goto hbhcheck;
557: }
558: }
559: #endif
560:
561: #if 0
562: {
563: /*
564: * Last resort: check in6_ifaddr for incoming interface.
565: * The code is here until I update the "goto ours hack" code above
566: * working right.
567: */
568: struct ifaddr *ifa;
1.113 dyoung 569: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9 itojun 570: if (ifa->ifa_addr == NULL)
571: continue; /* just for safety */
572: if (ifa->ifa_addr->sa_family != AF_INET6)
573: continue;
574: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
575: ours = 1;
576: deliverifp = ifa->ifa_ifp;
1.2 itojun 577: goto hbhcheck;
578: }
579: }
1.9 itojun 580: }
1.2 itojun 581: #endif
582:
583: /*
584: * Now there is no reason to process the packet if it's not our own
585: * and we're not a router.
586: */
587: if (!ip6_forwarding) {
1.116 thorpej 588: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9 itojun 589: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 590: goto bad;
591: }
592:
593: hbhcheck:
594: /*
1.81 rpaulo 595: * record address information into m_tag, if we don't have one yet.
596: * note that we are unable to record it, if the address is not listed
597: * as our interface address (e.g. multicast addresses, addresses
598: * within FAITH prefixes and such).
599: */
1.111 dyoung 600: if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81 rpaulo 601: struct in6_ifaddr *ia6;
602:
603: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111 dyoung 604: if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
605: /*
606: * XXX maybe we should drop the packet here,
607: * as we could not provide enough information
608: * to the upper layers.
609: */
1.81 rpaulo 610: }
611: }
612:
613: /*
1.2 itojun 614: * Process Hop-by-Hop options header if it's contained.
615: * m may be modified in ip6_hopopts_input().
616: * If a JumboPayload option is included, plen will also be modified.
617: */
618: plen = (u_int32_t)ntohs(ip6->ip6_plen);
619: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 620: struct ip6_hbh *hbh;
621:
622: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
623: #if 0 /*touches NULL pointer*/
624: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
625: #endif
1.2 itojun 626: return; /* m have already been freed */
1.9 itojun 627: }
1.22 itojun 628:
1.2 itojun 629: /* adjust pointer */
630: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 631:
632: /*
1.49 itojun 633: * if the payload length field is 0 and the next header field
1.22 itojun 634: * indicates Hop-by-Hop Options header, then a Jumbo Payload
635: * option MUST be included.
636: */
637: if (ip6->ip6_plen == 0 && plen == 0) {
638: /*
639: * Note that if a valid jumbo payload option is
1.83 rpaulo 640: * contained, ip6_hopopts_input() must set a valid
1.55 itojun 641: * (non-zero) payload length to the variable plen.
1.22 itojun 642: */
1.116 thorpej 643: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 644: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
645: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
646: icmp6_error(m, ICMP6_PARAM_PROB,
647: ICMP6_PARAMPROB_HEADER,
1.97 christos 648: (char *)&ip6->ip6_plen - (char *)ip6);
1.22 itojun 649: return;
650: }
1.9 itojun 651: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
652: sizeof(struct ip6_hbh));
653: if (hbh == NULL) {
1.116 thorpej 654: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 655: return;
656: }
1.57 thorpej 657: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 658: nxt = hbh->ip6h_nxt;
1.2 itojun 659:
660: /*
661: * accept the packet if a router alert option is included
662: * and we act as an IPv6 router.
663: */
1.5 itojun 664: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 665: ours = 1;
666: } else
667: nxt = ip6->ip6_nxt;
668:
669: /*
670: * Check that the amount of data in the buffers
671: * is as at least much as the IPv6 header would have us expect.
672: * Trim mbufs if longer than we expect.
673: * Drop packet if shorter than we expect.
674: */
675: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116 thorpej 676: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 677: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 678: goto bad;
679: }
680: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
681: if (m->m_len == m->m_pkthdr.len) {
682: m->m_len = sizeof(struct ip6_hdr) + plen;
683: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
684: } else
685: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
686: }
687:
688: /*
689: * Forward if desirable.
690: */
691: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
692: /*
693: * If we are acting as a multicast router, all
694: * incoming multicast packets are passed to the
695: * kernel-level multicast forwarding function.
696: * The packet is returned (relatively) intact; if
697: * ip6_mforward() returns a non-zero value, the packet
698: * must be discarded, else it may be accepted below.
699: */
700: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116 thorpej 701: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2 itojun 702: m_freem(m);
703: return;
704: }
705: if (!ours) {
706: m_freem(m);
707: return;
708: }
1.22 itojun 709: } else if (!ours) {
1.64 itojun 710: ip6_forward(m, srcrt);
1.2 itojun 711: return;
1.56 itojun 712: }
1.25 itojun 713:
714: ip6 = mtod(m, struct ip6_hdr *);
715:
716: /*
717: * Malicious party may be able to use IPv4 mapped addr to confuse
718: * tcp/udp stack and bypass security checks (act as if it was from
719: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
720: *
721: * For SIIT end node behavior, you may want to disable the check.
722: * However, you will become vulnerable to attacks using IPv4 mapped
723: * source.
724: */
725: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
726: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 thorpej 727: IP6_STATINC(IP6_STAT_BADSCOPE);
1.25 itojun 728: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
729: goto bad;
730: }
1.2 itojun 731:
732: /*
733: * Tell launch routine the next header
734: */
1.12 itojun 735: #ifdef IFA_STATS
1.28 itojun 736: if (deliverifp != NULL) {
1.9 itojun 737: struct in6_ifaddr *ia6;
738: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
739: if (ia6)
740: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
741: }
742: #endif
1.116 thorpej 743: IP6_STATINC(IP6_STAT_DELIVERED);
1.9 itojun 744: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 745: nest = 0;
1.40 itojun 746:
1.104 yamt 747: rh_present = 0;
1.2 itojun 748: while (nxt != IPPROTO_DONE) {
749: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116 thorpej 750: IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104 yamt 751: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 752: goto bad;
753: }
1.8 itojun 754:
755: /*
756: * protection against faulty packet - there should be
757: * more sanity checks in header chain processing.
758: */
759: if (m->m_pkthdr.len < off) {
1.116 thorpej 760: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 761: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 762: goto bad;
763: }
764:
1.104 yamt 765: if (nxt == IPPROTO_ROUTING) {
766: if (rh_present++) {
767: in6_ifstat_inc(m->m_pkthdr.rcvif,
768: ifs6_in_hdrerr);
1.116 thorpej 769: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104 yamt 770: goto bad;
771: }
772: }
773:
1.37 itojun 774: #ifdef IPSEC
775: /*
776: * enforce IPsec policy checking if we are seeing last header.
777: * note that we do not visit this with protocols with pcb layer
778: * code - like udp/tcp/raw ip.
779: */
780: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
781: ipsec6_in_reject(m, NULL)) {
1.117 ! thorpej 782: IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37 itojun 783: goto bad;
784: }
785: #endif
1.94 degroote 786: #ifdef FAST_IPSEC
787: /*
788: * enforce IPsec policy checking if we are seeing last header.
789: * note that we do not visit this with protocols with pcb layer
790: * code - like udp/tcp/raw ip.
791: */
792: if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
793: /*
794: * Check if the packet has already had IPsec processing
795: * done. If so, then just pass it along. This tag gets
796: * set during AH, ESP, etc. input handling, before the
797: * packet is returned to the ip input queue for delivery.
798: */
799: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
800: s = splsoftnet();
801: if (mtag != NULL) {
802: tdbi = (struct tdb_ident *)(mtag + 1);
803: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
804: } else {
805: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
806: IP_FORWARDING, &error);
807: }
808: if (sp != NULL) {
809: /*
810: * Check security policy against packet attributes.
811: */
812: error = ipsec_in_reject(sp, m);
813: KEY_FREESP(&sp);
814: } else {
815: /* XXX error stat??? */
816: error = EINVAL;
817: DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
818: }
819: splx(s);
820: if (error)
821: goto bad;
822: }
823: #endif /* FAST_IPSEC */
824:
1.56 itojun 825:
1.2 itojun 826: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
827: }
828: return;
829: bad:
830: m_freem(m);
831: }
832:
833: /*
1.81 rpaulo 834: * set/grab in6_ifaddr correspond to IPv6 destination address.
835: */
836: static struct m_tag *
1.112 dyoung 837: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81 rpaulo 838: {
839: struct m_tag *mtag;
840:
841: mtag = ip6_addaux(m);
1.112 dyoung 842: if (mtag != NULL) {
843: struct ip6aux *ip6a;
844:
845: ip6a = (struct ip6aux *)(mtag + 1);
846: in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
847: ip6a->ip6a_src = ia->ia_addr.sin6_addr;
848: ip6a->ip6a_flags = ia->ia6_flags;
849: }
1.81 rpaulo 850: return mtag; /* NULL if failed to set */
851: }
852:
1.112 dyoung 853: const struct ip6aux *
1.107 christos 854: ip6_getdstifaddr(struct mbuf *m)
1.81 rpaulo 855: {
856: struct m_tag *mtag;
857:
858: mtag = ip6_findaux(m);
1.112 dyoung 859: if (mtag != NULL)
860: return (struct ip6aux *)(mtag + 1);
1.81 rpaulo 861: else
862: return NULL;
863: }
864:
865: /*
1.2 itojun 866: * Hop-by-Hop options header processing. If a valid jumbo payload option is
867: * included, the real payload length will be stored in plenp.
1.107 christos 868: *
869: * rtalertp - XXX: should be stored more smart way
1.2 itojun 870: */
871: static int
1.107 christos 872: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
873: struct mbuf **mp, int *offp)
1.2 itojun 874: {
1.35 itojun 875: struct mbuf *m = *mp;
1.2 itojun 876: int off = *offp, hbhlen;
877: struct ip6_hbh *hbh;
878:
879: /* validation of the length of the header */
1.9 itojun 880: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
881: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
882: if (hbh == NULL) {
1.116 thorpej 883: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 884: return -1;
885: }
886: hbhlen = (hbh->ip6h_len + 1) << 3;
887: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
888: hbhlen);
889: if (hbh == NULL) {
1.116 thorpej 890: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 891: return -1;
892: }
1.57 thorpej 893: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 894: off += hbhlen;
895: hbhlen -= sizeof(struct ip6_hbh);
896:
897: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
898: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 899: return (-1);
1.2 itojun 900:
901: *offp = off;
902: *mp = m;
1.58 itojun 903: return (0);
1.2 itojun 904: }
905:
906: /*
907: * Search header for all Hop-by-hop options and process each option.
908: * This function is separate from ip6_hopopts_input() in order to
909: * handle a case where the sending node itself process its hop-by-hop
910: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 911: *
912: * The function assumes that hbh header is located right after the IPv6 header
913: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
914: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 915: */
916: int
1.107 christos 917: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
918: u_int32_t *rtalertp, u_int32_t *plenp)
1.2 itojun 919: {
920: struct ip6_hdr *ip6;
921: int optlen = 0;
922: u_int8_t *opt = opthead;
923: u_int16_t rtalert_val;
1.22 itojun 924: u_int32_t jumboplen;
1.55 itojun 925: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 926:
927: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 928: switch (*opt) {
929: case IP6OPT_PAD1:
930: optlen = 1;
931: break;
932: case IP6OPT_PADN:
933: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 934: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 935: goto bad;
936: }
937: optlen = *(opt + 1) + 2;
938: break;
939: case IP6OPT_RTALERT:
940: /* XXX may need check for alignment */
941: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116 thorpej 942: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 943: goto bad;
944: }
945: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 946: /* XXX stat */
947: icmp6_error(m, ICMP6_PARAM_PROB,
948: ICMP6_PARAMPROB_HEADER,
949: erroff + opt + 1 - opthead);
950: return (-1);
1.35 itojun 951: }
952: optlen = IP6OPT_RTALERT_LEN;
1.97 christos 953: bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35 itojun 954: *rtalertp = ntohs(rtalert_val);
955: break;
956: case IP6OPT_JUMBO:
1.22 itojun 957: /* XXX may need check for alignment */
958: if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116 thorpej 959: IP6_STATINC(IP6_STAT_TOOSMALL);
1.22 itojun 960: goto bad;
961: }
1.35 itojun 962: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 963: /* XXX stat */
964: icmp6_error(m, ICMP6_PARAM_PROB,
965: ICMP6_PARAMPROB_HEADER,
966: erroff + opt + 1 - opthead);
967: return (-1);
1.35 itojun 968: }
1.22 itojun 969: optlen = IP6OPT_JUMBO_LEN;
970:
971: /*
972: * IPv6 packets that have non 0 payload length
1.35 itojun 973: * must not contain a jumbo payload option.
1.22 itojun 974: */
975: ip6 = mtod(m, struct ip6_hdr *);
976: if (ip6->ip6_plen) {
1.116 thorpej 977: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 978: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 979: ICMP6_PARAMPROB_HEADER,
980: erroff + opt - opthead);
981: return (-1);
1.22 itojun 982: }
1.2 itojun 983:
1.22 itojun 984: /*
985: * We may see jumbolen in unaligned location, so
986: * we'd need to perform bcopy().
987: */
988: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
989: jumboplen = (u_int32_t)htonl(jumboplen);
990:
991: #if 1
992: /*
993: * if there are multiple jumbo payload options,
994: * *plenp will be non-zero and the packet will be
995: * rejected.
996: * the behavior may need some debate in ipngwg -
997: * multiple options does not make sense, however,
998: * there's no explicit mention in specification.
999: */
1000: if (*plenp != 0) {
1.116 thorpej 1001: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1002: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1003: ICMP6_PARAMPROB_HEADER,
1004: erroff + opt + 2 - opthead);
1005: return (-1);
1.22 itojun 1006: }
1.8 itojun 1007: #endif
1.2 itojun 1008:
1.22 itojun 1009: /*
1010: * jumbo payload length must be larger than 65535.
1011: */
1012: if (jumboplen <= IPV6_MAXPACKET) {
1.116 thorpej 1013: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1014: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1015: ICMP6_PARAMPROB_HEADER,
1016: erroff + opt + 2 - opthead);
1017: return (-1);
1.22 itojun 1018: }
1019: *plenp = jumboplen;
1020:
1021: break;
1.35 itojun 1022: default: /* unknown option */
1023: if (hbhlen < IP6OPT_MINLEN) {
1.116 thorpej 1024: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 1025: goto bad;
1026: }
1.55 itojun 1027: optlen = ip6_unknown_opt(opt, m,
1028: erroff + opt - opthead);
1029: if (optlen == -1)
1030: return (-1);
1.35 itojun 1031: optlen += 2;
1032: break;
1.2 itojun 1033: }
1034: }
1035:
1.55 itojun 1036: return (0);
1.2 itojun 1037:
1038: bad:
1039: m_freem(m);
1.55 itojun 1040: return (-1);
1.2 itojun 1041: }
1042:
1043: /*
1044: * Unknown option processing.
1045: * The third argument `off' is the offset from the IPv6 header to the option,
1046: * which is necessary if the IPv6 header the and option header and IPv6 header
1047: * is not continuous in order to return an ICMPv6 error.
1048: */
1049: int
1.107 christos 1050: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2 itojun 1051: {
1052: struct ip6_hdr *ip6;
1053:
1.35 itojun 1054: switch (IP6OPT_TYPE(*optp)) {
1055: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 1056: return ((int)*(optp + 1));
1.35 itojun 1057: case IP6OPT_TYPE_DISCARD: /* silently discard */
1058: m_freem(m);
1.58 itojun 1059: return (-1);
1.35 itojun 1060: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116 thorpej 1061: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1062: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1063: return (-1);
1.35 itojun 1064: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116 thorpej 1065: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1066: ip6 = mtod(m, struct ip6_hdr *);
1067: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1068: (m->m_flags & (M_BCAST|M_MCAST)))
1069: m_freem(m);
1070: else
1071: icmp6_error(m, ICMP6_PARAM_PROB,
1072: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1073: return (-1);
1.2 itojun 1074: }
1075:
1076: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 1077: return (-1);
1.2 itojun 1078: }
1079:
1080: /*
1.9 itojun 1081: * Create the "control" list for this pcb.
1082: *
1083: * The routine will be called from upper layer handlers like tcp6_input().
1084: * Thus the routine assumes that the caller (tcp6_input) have already
1085: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1086: * very first mbuf on the mbuf chain.
1087: * We may want to add some infinite loop prevention or sanity checks for safety.
1088: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1089: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1090: */
1091: void
1.107 christos 1092: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1093: struct ip6_hdr *ip6, struct mbuf *m)
1.2 itojun 1094: {
1.85 rpaulo 1095: #ifdef RFC2292
1096: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1097: #else
1098: #define IS2292(x, y) (y)
1099: #endif
1100:
1.9 itojun 1101: #ifdef SO_TIMESTAMP
1.2 itojun 1102: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1103: struct timeval tv;
1104:
1105: microtime(&tv);
1.97 christos 1106: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63 itojun 1107: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1108: if (*mp)
1109: mp = &(*mp)->m_next;
1110: }
1.9 itojun 1111: #endif
1.87 rpaulo 1112:
1113: /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1114: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1115: return;
1116:
1.2 itojun 1117: /* RFC 2292 sec. 5 */
1.35 itojun 1118: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1119: struct in6_pktinfo pi6;
1.85 rpaulo 1120:
1.2 itojun 1121: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81 rpaulo 1122: in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84 christos 1123: pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1124: m->m_pkthdr.rcvif->if_index : 0;
1.97 christos 1125: *mp = sbcreatecontrol((void *) &pi6,
1.85 rpaulo 1126: sizeof(struct in6_pktinfo),
1127: IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2 itojun 1128: if (*mp)
1129: mp = &(*mp)->m_next;
1130: }
1.85 rpaulo 1131:
1.2 itojun 1132: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1133: int hlim = ip6->ip6_hlim & 0xff;
1.85 rpaulo 1134:
1.97 christos 1135: *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85 rpaulo 1136: IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1137: if (*mp)
1138: mp = &(*mp)->m_next;
1139: }
1140:
1141: if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1142: u_int32_t flowinfo;
1143: int tclass;
1144:
1145: flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1146: flowinfo >>= 20;
1147:
1148: tclass = flowinfo & 0xff;
1.97 christos 1149: *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85 rpaulo 1150: IPV6_TCLASS, IPPROTO_IPV6);
1151:
1.2 itojun 1152: if (*mp)
1153: mp = &(*mp)->m_next;
1154: }
1155:
1156: /*
1.75 itojun 1157: * IPV6_HOPOPTS socket option. Recall that we required super-user
1158: * privilege for the option (see ip6_ctloutput), but it might be too
1159: * strict, since there might be some hop-by-hop options which can be
1160: * returned to normal user.
1.85 rpaulo 1161: * See also RFC3542 section 8 (or RFC2292 section 6).
1.2 itojun 1162: */
1.75 itojun 1163: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2 itojun 1164: /*
1165: * Check if a hop-by-hop options header is contatined in the
1166: * received packet, and if so, store the options as ancillary
1167: * data. Note that a hop-by-hop options header must be
1168: * just after the IPv6 header, which fact is assured through
1169: * the IPv6 input processing.
1170: */
1.78 christos 1171: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1172: if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1173: struct ip6_hbh *hbh;
1174: int hbhlen;
1.62 itojun 1175: struct mbuf *ext;
1.9 itojun 1176:
1.62 itojun 1177: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78 christos 1178: xip6->ip6_nxt);
1.62 itojun 1179: if (ext == NULL) {
1.116 thorpej 1180: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1181: return;
1182: }
1.62 itojun 1183: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1184: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1185: if (hbhlen != ext->m_len) {
1186: m_freem(ext);
1.116 thorpej 1187: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1188: return;
1189: }
1.2 itojun 1190:
1191: /*
1192: * XXX: We copy whole the header even if a jumbo
1193: * payload option is included, which option is to
1194: * be removed before returning in the RFC 2292.
1.85 rpaulo 1195: * Note: this constraint is removed in RFC3542.
1.2 itojun 1196: */
1.97 christos 1197: *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85 rpaulo 1198: IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1199: IPPROTO_IPV6);
1.2 itojun 1200: if (*mp)
1201: mp = &(*mp)->m_next;
1.62 itojun 1202: m_freem(ext);
1.2 itojun 1203: }
1204: }
1205:
1206: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1207: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78 christos 1208: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1209: int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1210:
1211: /*
1212: * Search for destination options headers or routing
1213: * header(s) through the header chain, and stores each
1214: * header as ancillary data.
1215: * Note that the order of the headers remains in
1216: * the chain of ancillary data.
1217: */
1.86 rpaulo 1218: for (;;) { /* is explicit loop prevention necessary? */
1.62 itojun 1219: struct ip6_ext *ip6e = NULL;
1.9 itojun 1220: int elen;
1.62 itojun 1221: struct mbuf *ext = NULL;
1.9 itojun 1222:
1.62 itojun 1223: /*
1224: * if it is not an extension header, don't try to
1225: * pull it from the chain.
1226: */
1227: switch (nxt) {
1228: case IPPROTO_DSTOPTS:
1229: case IPPROTO_ROUTING:
1230: case IPPROTO_HOPOPTS:
1231: case IPPROTO_AH: /* is it possible? */
1232: break;
1233: default:
1234: goto loopend;
1235: }
1236:
1237: ext = ip6_pullexthdr(m, off, nxt);
1238: if (ext == NULL) {
1.116 thorpej 1239: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1240: return;
1241: }
1.62 itojun 1242: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1243: if (nxt == IPPROTO_AH)
1244: elen = (ip6e->ip6e_len + 2) << 2;
1245: else
1246: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1247: if (elen != ext->m_len) {
1248: m_freem(ext);
1.116 thorpej 1249: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1250: return;
1251: }
1.57 thorpej 1252: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1253:
1.35 itojun 1254: switch (nxt) {
1.62 itojun 1255: case IPPROTO_DSTOPTS:
1.35 itojun 1256: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1257: break;
1258:
1.97 christos 1259: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1260: IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1261: IPPROTO_IPV6);
1.35 itojun 1262: if (*mp)
1263: mp = &(*mp)->m_next;
1264: break;
1265:
1266: case IPPROTO_ROUTING:
1267: if (!in6p->in6p_flags & IN6P_RTHDR)
1268: break;
1269:
1.97 christos 1270: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1271: IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1272: IPPROTO_IPV6);
1.35 itojun 1273: if (*mp)
1274: mp = &(*mp)->m_next;
1275: break;
1276:
1.62 itojun 1277: case IPPROTO_HOPOPTS:
1278: case IPPROTO_AH: /* is it possible? */
1279: break;
1280:
1.35 itojun 1281: default:
1282: /*
1.62 itojun 1283: * other cases have been filtered in the above.
1284: * none will visit this case. here we supply
1285: * the code just in case (nxt overwritten or
1286: * other cases).
1.35 itojun 1287: */
1.62 itojun 1288: m_freem(ext);
1.35 itojun 1289: goto loopend;
1290:
1.2 itojun 1291: }
1292:
1293: /* proceed with the next header. */
1.9 itojun 1294: off += elen;
1.2 itojun 1295: nxt = ip6e->ip6e_nxt;
1.62 itojun 1296: ip6e = NULL;
1297: m_freem(ext);
1298: ext = NULL;
1.2 itojun 1299: }
1300: loopend:
1.62 itojun 1301: ;
1.2 itojun 1302: }
1.62 itojun 1303: }
1.85 rpaulo 1304: #undef IS2292
1305:
1306:
1307: void
1.95 dyoung 1308: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1309: uint32_t *mtu)
1.85 rpaulo 1310: {
1311: struct socket *so;
1312: struct mbuf *m_mtu;
1313: struct ip6_mtuinfo mtuctl;
1314:
1315: so = in6p->in6p_socket;
1316:
1317: if (mtu == NULL)
1318: return;
1319:
1320: #ifdef DIAGNOSTIC
1321: if (so == NULL) /* I believe this is impossible */
1322: panic("ip6_notify_pmtu: socket is NULL");
1323: #endif
1324:
1325: memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1326: mtuctl.ip6m_mtu = *mtu;
1327: mtuctl.ip6m_addr = *dst;
1328: if (sa6_recoverscope(&mtuctl.ip6m_addr))
1329: return;
1330:
1.97 christos 1331: if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85 rpaulo 1332: IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1333: return;
1334:
1.95 dyoung 1335: if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85 rpaulo 1336: == 0) {
1337: m_freem(m_mtu);
1338: /* XXX: should count statistics */
1339: } else
1340: sorwakeup(so);
1341:
1342: return;
1343: }
1.62 itojun 1344:
1345: /*
1346: * pull single extension header from mbuf chain. returns single mbuf that
1347: * contains the result, or NULL on error.
1348: */
1349: static struct mbuf *
1.107 christos 1350: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62 itojun 1351: {
1352: struct ip6_ext ip6e;
1353: size_t elen;
1354: struct mbuf *n;
1355:
1356: #ifdef DIAGNOSTIC
1357: switch (nxt) {
1358: case IPPROTO_DSTOPTS:
1359: case IPPROTO_ROUTING:
1360: case IPPROTO_HOPOPTS:
1361: case IPPROTO_AH: /* is it possible? */
1362: break;
1363: default:
1364: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1365: }
1.62 itojun 1366: #endif
1.2 itojun 1367:
1.97 christos 1368: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62 itojun 1369: if (nxt == IPPROTO_AH)
1370: elen = (ip6e.ip6e_len + 2) << 2;
1371: else
1372: elen = (ip6e.ip6e_len + 1) << 3;
1373:
1374: MGET(n, M_DONTWAIT, MT_DATA);
1375: if (n && elen >= MLEN) {
1376: MCLGET(n, M_DONTWAIT);
1377: if ((n->m_flags & M_EXT) == 0) {
1378: m_free(n);
1379: n = NULL;
1380: }
1381: }
1382: if (!n)
1383: return NULL;
1384:
1385: n->m_len = 0;
1386: if (elen >= M_TRAILINGSPACE(n)) {
1387: m_free(n);
1388: return NULL;
1389: }
1390:
1.97 christos 1391: m_copydata(m, off, elen, mtod(n, void *));
1.62 itojun 1392: n->m_len = elen;
1393: return n;
1.2 itojun 1394: }
1395:
1396: /*
1397: * Get pointer to the previous header followed by the header
1398: * currently processed.
1399: * XXX: This function supposes that
1400: * M includes all headers,
1401: * the next header field and the header length field of each header
1402: * are valid, and
1403: * the sum of each header length equals to OFF.
1404: * Because of these assumptions, this function must be called very
1405: * carefully. Moreover, it will not be used in the near future when
1406: * we develop `neater' mechanism to process extension headers.
1407: */
1.58 itojun 1408: u_int8_t *
1.107 christos 1409: ip6_get_prevhdr(struct mbuf *m, int off)
1.2 itojun 1410: {
1411: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1412:
1413: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1414: return (&ip6->ip6_nxt);
1.2 itojun 1415: else {
1416: int len, nxt;
1417: struct ip6_ext *ip6e = NULL;
1418:
1419: nxt = ip6->ip6_nxt;
1420: len = sizeof(struct ip6_hdr);
1421: while (len < off) {
1.97 christos 1422: ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2 itojun 1423:
1.35 itojun 1424: switch (nxt) {
1.2 itojun 1425: case IPPROTO_FRAGMENT:
1426: len += sizeof(struct ip6_frag);
1427: break;
1428: case IPPROTO_AH:
1429: len += (ip6e->ip6e_len + 2) << 2;
1430: break;
1431: default:
1432: len += (ip6e->ip6e_len + 1) << 3;
1433: break;
1434: }
1435: nxt = ip6e->ip6e_nxt;
1436: }
1437: if (ip6e)
1.58 itojun 1438: return (&ip6e->ip6e_nxt);
1.2 itojun 1439: else
1440: return NULL;
1.18 itojun 1441: }
1442: }
1443:
1444: /*
1445: * get next header offset. m will be retained.
1446: */
1447: int
1.107 christos 1448: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1449: {
1450: struct ip6_hdr ip6;
1451: struct ip6_ext ip6e;
1452: struct ip6_frag fh;
1453:
1454: /* just in case */
1455: if (m == NULL)
1456: panic("ip6_nexthdr: m == NULL");
1457: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1458: return -1;
1459:
1460: switch (proto) {
1461: case IPPROTO_IPV6:
1.83 rpaulo 1462: /* do not chase beyond intermediate IPv6 headers */
1463: if (off != 0)
1464: return -1;
1.18 itojun 1465: if (m->m_pkthdr.len < off + sizeof(ip6))
1466: return -1;
1.97 christos 1467: m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18 itojun 1468: if (nxtp)
1469: *nxtp = ip6.ip6_nxt;
1470: off += sizeof(ip6);
1471: return off;
1472:
1473: case IPPROTO_FRAGMENT:
1474: /*
1475: * terminate parsing if it is not the first fragment,
1476: * it does not make sense to parse through it.
1477: */
1478: if (m->m_pkthdr.len < off + sizeof(fh))
1479: return -1;
1.97 christos 1480: m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67 itojun 1481: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1482: return -1;
1483: if (nxtp)
1484: *nxtp = fh.ip6f_nxt;
1485: off += sizeof(struct ip6_frag);
1486: return off;
1487:
1488: case IPPROTO_AH:
1489: if (m->m_pkthdr.len < off + sizeof(ip6e))
1490: return -1;
1.97 christos 1491: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1492: if (nxtp)
1493: *nxtp = ip6e.ip6e_nxt;
1494: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1495: if (m->m_pkthdr.len < off)
1496: return -1;
1.18 itojun 1497: return off;
1498:
1499: case IPPROTO_HOPOPTS:
1500: case IPPROTO_ROUTING:
1501: case IPPROTO_DSTOPTS:
1502: if (m->m_pkthdr.len < off + sizeof(ip6e))
1503: return -1;
1.97 christos 1504: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1505: if (nxtp)
1506: *nxtp = ip6e.ip6e_nxt;
1507: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1508: if (m->m_pkthdr.len < off)
1509: return -1;
1.18 itojun 1510: return off;
1511:
1512: case IPPROTO_NONE:
1513: case IPPROTO_ESP:
1514: case IPPROTO_IPCOMP:
1515: /* give up */
1516: return -1;
1517:
1518: default:
1519: return -1;
1520: }
1521: }
1522:
1523: /*
1524: * get offset for the last header in the chain. m will be kept untainted.
1525: */
1526: int
1.107 christos 1527: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1528: {
1529: int newoff;
1530: int nxt;
1531:
1532: if (!nxtp) {
1533: nxt = -1;
1534: nxtp = &nxt;
1535: }
1.86 rpaulo 1536: for (;;) {
1.18 itojun 1537: newoff = ip6_nexthdr(m, off, proto, nxtp);
1538: if (newoff < 0)
1539: return off;
1540: else if (newoff < off)
1541: return -1; /* invalid */
1542: else if (newoff == off)
1543: return newoff;
1544:
1545: off = newoff;
1546: proto = *nxtp;
1.2 itojun 1547: }
1548: }
1549:
1.81 rpaulo 1550: struct m_tag *
1.107 christos 1551: ip6_addaux(struct mbuf *m)
1.81 rpaulo 1552: {
1553: struct m_tag *mtag;
1554:
1555: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1556: if (!mtag) {
1557: mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1558: M_NOWAIT);
1559: if (mtag) {
1560: m_tag_prepend(m, mtag);
1561: bzero(mtag + 1, sizeof(struct ip6aux));
1562: }
1563: }
1564: return mtag;
1565: }
1566:
1567: struct m_tag *
1.107 christos 1568: ip6_findaux(struct mbuf *m)
1.81 rpaulo 1569: {
1570: struct m_tag *mtag;
1571:
1572: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1573: return mtag;
1574: }
1575:
1576: void
1.107 christos 1577: ip6_delaux(struct mbuf *m)
1.81 rpaulo 1578: {
1579: struct m_tag *mtag;
1580:
1581: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1582: if (mtag)
1583: m_tag_delete(m, mtag);
1584: }
1585:
1.98 liamjfoy 1586: #ifdef GATEWAY
1587: /*
1588: * sysctl helper routine for net.inet.ip6.maxflows. Since
1589: * we could reduce this value, call ip6flow_reap();
1590: */
1591: static int
1.101 liamjfoy 1592: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98 liamjfoy 1593: {
1594: int s;
1595:
1596: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.100 liamjfoy 1597: if (s || newp == NULL)
1.98 liamjfoy 1598: return (s);
1599:
1600: s = splsoftnet();
1601: ip6flow_reap(0);
1602: splx(s);
1603:
1604: return (0);
1605: }
1.99 liamjfoy 1606:
1607: static int
1608: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1609: {
1610: int error, tmp;
1611: struct sysctlnode node;
1612:
1613: node = *rnode;
1614: tmp = ip6_hashsize;
1615: node.sysctl_data = &tmp;
1616: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1617: if (error || newp == NULL)
1618: return (error);
1619:
1620: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1621: /*
1622: * Can only fail due to malloc()
1623: */
1624: if (ip6flow_invalidate_all(tmp))
1625: return ENOMEM;
1626: } else {
1627: /*
1628: * EINVAL if not a power of 2
1629: */
1630: return EINVAL;
1631: }
1632:
1633: return (0);
1634: }
1.98 liamjfoy 1635: #endif /* GATEWAY */
1636:
1.2 itojun 1637: /*
1638: * System control for IP6
1639: */
1640:
1641: u_char inet6ctlerrmap[PRC_NCMDS] = {
1642: 0, 0, 0, 0,
1643: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1644: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1645: EMSGSIZE, EHOSTUNREACH, 0, 0,
1646: 0, 0, 0, 0,
1647: ENOPROTOOPT
1648: };
1649:
1.116 thorpej 1650: static int
1651: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1652: {
1.117 ! thorpej 1653: netstat_sysctl_context ctx;
1.116 thorpej 1654: uint64_t ip6s[IP6_NSTATS];
1655:
1.117 ! thorpej 1656: ctx.ctx_stat = ip6stat_percpu;
! 1657: ctx.ctx_counters = ip6s;
! 1658: ctx.ctx_ncounters = IP6_NSTATS;
! 1659: return (NETSTAT_SYSCTL(&ctx));
1.116 thorpej 1660: }
1661:
1.70 atatat 1662: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2 itojun 1663: {
1.85 rpaulo 1664: #ifdef RFC2292
1665: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1666: #else
1667: #define IS2292(x, y) (y)
1668: #endif
1.26 itojun 1669:
1.73 atatat 1670: sysctl_createv(clog, 0, NULL, NULL,
1671: CTLFLAG_PERMANENT,
1.70 atatat 1672: CTLTYPE_NODE, "net", NULL,
1673: NULL, 0, NULL, 0,
1674: CTL_NET, CTL_EOL);
1.73 atatat 1675: sysctl_createv(clog, 0, NULL, NULL,
1676: CTLFLAG_PERMANENT,
1.74 atatat 1677: CTLTYPE_NODE, "inet6",
1678: SYSCTL_DESCR("PF_INET6 related settings"),
1.70 atatat 1679: NULL, 0, NULL, 0,
1680: CTL_NET, PF_INET6, CTL_EOL);
1.73 atatat 1681: sysctl_createv(clog, 0, NULL, NULL,
1682: CTLFLAG_PERMANENT,
1.74 atatat 1683: CTLTYPE_NODE, "ip6",
1684: SYSCTL_DESCR("IPv6 related settings"),
1.70 atatat 1685: NULL, 0, NULL, 0,
1686: CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1687:
1.73 atatat 1688: sysctl_createv(clog, 0, NULL, NULL,
1689: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1690: CTLTYPE_INT, "forwarding",
1691: SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70 atatat 1692: NULL, 0, &ip6_forwarding, 0,
1693: CTL_NET, PF_INET6, IPPROTO_IPV6,
1694: IPV6CTL_FORWARDING, CTL_EOL);
1.73 atatat 1695: sysctl_createv(clog, 0, NULL, NULL,
1696: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1697: CTLTYPE_INT, "redirect",
1698: SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70 atatat 1699: NULL, 0, &ip6_sendredirects, 0,
1700: CTL_NET, PF_INET6, IPPROTO_IPV6,
1701: IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73 atatat 1702: sysctl_createv(clog, 0, NULL, NULL,
1703: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1704: CTLTYPE_INT, "hlim",
1705: SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70 atatat 1706: NULL, 0, &ip6_defhlim, 0,
1707: CTL_NET, PF_INET6, IPPROTO_IPV6,
1708: IPV6CTL_DEFHLIM, CTL_EOL);
1709: #ifdef notyet
1.73 atatat 1710: sysctl_createv(clog, 0, NULL, NULL,
1711: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1712: CTLTYPE_INT, "mtu", NULL,
1713: NULL, 0, &, 0,
1714: CTL_NET, PF_INET6, IPPROTO_IPV6,
1715: IPV6CTL_DEFMTU, CTL_EOL);
1716: #endif
1717: #ifdef __no_idea__
1.73 atatat 1718: sysctl_createv(clog, 0, NULL, NULL,
1719: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1720: CTLTYPE_INT, "forwsrcrt", NULL,
1721: NULL, 0, &?, 0,
1722: CTL_NET, PF_INET6, IPPROTO_IPV6,
1723: IPV6CTL_FORWSRCRT, CTL_EOL);
1.73 atatat 1724: sysctl_createv(clog, 0, NULL, NULL,
1725: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1726: CTLTYPE_STRUCT, "mrtstats", NULL,
1727: NULL, 0, &?, sizeof(?),
1728: CTL_NET, PF_INET6, IPPROTO_IPV6,
1729: IPV6CTL_MRTSTATS, CTL_EOL);
1.73 atatat 1730: sysctl_createv(clog, 0, NULL, NULL,
1731: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1732: CTLTYPE_?, "mrtproto", NULL,
1733: NULL, 0, &?, sizeof(?),
1734: CTL_NET, PF_INET6, IPPROTO_IPV6,
1735: IPV6CTL_MRTPROTO, CTL_EOL);
1736: #endif
1.73 atatat 1737: sysctl_createv(clog, 0, NULL, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1739: CTLTYPE_INT, "maxfragpackets",
1740: SYSCTL_DESCR("Maximum number of fragments to buffer "
1741: "for reassembly"),
1.70 atatat 1742: NULL, 0, &ip6_maxfragpackets, 0,
1743: CTL_NET, PF_INET6, IPPROTO_IPV6,
1744: IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1745: #ifdef __no_idea__
1.73 atatat 1746: sysctl_createv(clog, 0, NULL, NULL,
1747: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1748: CTLTYPE_INT, "sourcecheck", NULL,
1749: NULL, 0, &?, 0,
1750: CTL_NET, PF_INET6, IPPROTO_IPV6,
1751: IPV6CTL_SOURCECHECK, CTL_EOL);
1.73 atatat 1752: sysctl_createv(clog, 0, NULL, NULL,
1753: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1754: CTLTYPE_INT, "sourcecheck_logint", NULL,
1755: NULL, 0, &?, 0,
1756: CTL_NET, PF_INET6, IPPROTO_IPV6,
1757: IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1758: #endif
1.73 atatat 1759: sysctl_createv(clog, 0, NULL, NULL,
1760: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1761: CTLTYPE_INT, "accept_rtadv",
1762: SYSCTL_DESCR("Accept router advertisements"),
1.70 atatat 1763: NULL, 0, &ip6_accept_rtadv, 0,
1764: CTL_NET, PF_INET6, IPPROTO_IPV6,
1765: IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73 atatat 1766: sysctl_createv(clog, 0, NULL, NULL,
1767: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1768: CTLTYPE_INT, "keepfaith",
1769: SYSCTL_DESCR("Activate faith interface"),
1.70 atatat 1770: NULL, 0, &ip6_keepfaith, 0,
1771: CTL_NET, PF_INET6, IPPROTO_IPV6,
1772: IPV6CTL_KEEPFAITH, CTL_EOL);
1.73 atatat 1773: sysctl_createv(clog, 0, NULL, NULL,
1774: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1775: CTLTYPE_INT, "log_interval",
1776: SYSCTL_DESCR("Minumum interval between logging "
1777: "unroutable packets"),
1.70 atatat 1778: NULL, 0, &ip6_log_interval, 0,
1779: CTL_NET, PF_INET6, IPPROTO_IPV6,
1780: IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73 atatat 1781: sysctl_createv(clog, 0, NULL, NULL,
1782: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1783: CTLTYPE_INT, "hdrnestlimit",
1784: SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70 atatat 1785: NULL, 0, &ip6_hdrnestlimit, 0,
1786: CTL_NET, PF_INET6, IPPROTO_IPV6,
1787: IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73 atatat 1788: sysctl_createv(clog, 0, NULL, NULL,
1789: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1790: CTLTYPE_INT, "dad_count",
1791: SYSCTL_DESCR("Number of Duplicate Address Detection "
1792: "probes to send"),
1.70 atatat 1793: NULL, 0, &ip6_dad_count, 0,
1794: CTL_NET, PF_INET6, IPPROTO_IPV6,
1795: IPV6CTL_DAD_COUNT, CTL_EOL);
1.73 atatat 1796: sysctl_createv(clog, 0, NULL, NULL,
1797: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1798: CTLTYPE_INT, "auto_flowlabel",
1799: SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70 atatat 1800: NULL, 0, &ip6_auto_flowlabel, 0,
1801: CTL_NET, PF_INET6, IPPROTO_IPV6,
1802: IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73 atatat 1803: sysctl_createv(clog, 0, NULL, NULL,
1804: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1805: CTLTYPE_INT, "defmcasthlim",
1806: SYSCTL_DESCR("Default multicast hop limit"),
1.70 atatat 1807: NULL, 0, &ip6_defmcasthlim, 0,
1808: CTL_NET, PF_INET6, IPPROTO_IPV6,
1809: IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51 itojun 1810: #if NGIF > 0
1.73 atatat 1811: sysctl_createv(clog, 0, NULL, NULL,
1812: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1813: CTLTYPE_INT, "gifhlim",
1814: SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70 atatat 1815: NULL, 0, &ip6_gif_hlim, 0,
1816: CTL_NET, PF_INET6, IPPROTO_IPV6,
1817: IPV6CTL_GIF_HLIM, CTL_EOL);
1818: #endif /* NGIF */
1.73 atatat 1819: sysctl_createv(clog, 0, NULL, NULL,
1820: CTLFLAG_PERMANENT,
1.74 atatat 1821: CTLTYPE_STRING, "kame_version",
1822: SYSCTL_DESCR("KAME Version"),
1.78 christos 1823: NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70 atatat 1824: CTL_NET, PF_INET6, IPPROTO_IPV6,
1825: IPV6CTL_KAME_VERSION, CTL_EOL);
1.73 atatat 1826: sysctl_createv(clog, 0, NULL, NULL,
1827: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1828: CTLTYPE_INT, "use_deprecated",
1829: SYSCTL_DESCR("Allow use of deprecated addresses as "
1830: "source addresses"),
1.70 atatat 1831: NULL, 0, &ip6_use_deprecated, 0,
1832: CTL_NET, PF_INET6, IPPROTO_IPV6,
1833: IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73 atatat 1834: sysctl_createv(clog, 0, NULL, NULL,
1835: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1836: CTLTYPE_INT, "rr_prune", NULL,
1837: NULL, 0, &ip6_rr_prune, 0,
1838: CTL_NET, PF_INET6, IPPROTO_IPV6,
1839: IPV6CTL_RR_PRUNE, CTL_EOL);
1.73 atatat 1840: sysctl_createv(clog, 0, NULL, NULL,
1841: CTLFLAG_PERMANENT
1.70 atatat 1842: #ifndef INET6_BINDV6ONLY
1.73 atatat 1843: |CTLFLAG_READWRITE,
1.70 atatat 1844: #endif
1.74 atatat 1845: CTLTYPE_INT, "v6only",
1846: SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1847: "to PF_INET sockets"),
1.70 atatat 1848: NULL, 0, &ip6_v6only, 0,
1849: CTL_NET, PF_INET6, IPPROTO_IPV6,
1850: IPV6CTL_V6ONLY, CTL_EOL);
1.73 atatat 1851: sysctl_createv(clog, 0, NULL, NULL,
1852: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1853: CTLTYPE_INT, "anonportmin",
1854: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70 atatat 1855: sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1856: CTL_NET, PF_INET6, IPPROTO_IPV6,
1857: IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73 atatat 1858: sysctl_createv(clog, 0, NULL, NULL,
1859: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1860: CTLTYPE_INT, "anonportmax",
1861: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70 atatat 1862: sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1863: CTL_NET, PF_INET6, IPPROTO_IPV6,
1864: IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26 itojun 1865: #ifndef IPNOPRIVPORTS
1.73 atatat 1866: sysctl_createv(clog, 0, NULL, NULL,
1867: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1868: CTLTYPE_INT, "lowportmin",
1869: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1870: "to assign"),
1.70 atatat 1871: sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1872: CTL_NET, PF_INET6, IPPROTO_IPV6,
1873: IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73 atatat 1874: sysctl_createv(clog, 0, NULL, NULL,
1875: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1876: CTLTYPE_INT, "lowportmax",
1877: SYSCTL_DESCR("Highest privileged ephemeral port number "
1878: "to assign"),
1.70 atatat 1879: sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1880: CTL_NET, PF_INET6, IPPROTO_IPV6,
1881: IPV6CTL_LOWPORTMAX, CTL_EOL);
1882: #endif /* IPNOPRIVPORTS */
1.73 atatat 1883: sysctl_createv(clog, 0, NULL, NULL,
1884: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83 rpaulo 1885: CTLTYPE_INT, "use_tempaddr",
1886: SYSCTL_DESCR("Use temporary address"),
1887: NULL, 0, &ip6_use_tempaddr, 0,
1888: CTL_NET, PF_INET6, IPPROTO_IPV6,
1889: CTL_CREATE, CTL_EOL);
1890: sysctl_createv(clog, 0, NULL, NULL,
1891: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1892: CTLTYPE_INT, "temppltime",
1893: SYSCTL_DESCR("preferred lifetime of a temporary address"),
1894: NULL, 0, &ip6_temp_preferred_lifetime, 0,
1895: CTL_NET, PF_INET6, IPPROTO_IPV6,
1896: CTL_CREATE, CTL_EOL);
1897: sysctl_createv(clog, 0, NULL, NULL,
1898: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1899: CTLTYPE_INT, "tempvltime",
1900: SYSCTL_DESCR("valid lifetime of a temporary address"),
1901: NULL, 0, &ip6_temp_valid_lifetime, 0,
1902: CTL_NET, PF_INET6, IPPROTO_IPV6,
1903: CTL_CREATE, CTL_EOL);
1904: sysctl_createv(clog, 0, NULL, NULL,
1905: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1906: CTLTYPE_INT, "maxfrags",
1907: SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70 atatat 1908: NULL, 0, &ip6_maxfrags, 0,
1909: CTL_NET, PF_INET6, IPPROTO_IPV6,
1910: IPV6CTL_MAXFRAGS, CTL_EOL);
1.79 rpaulo 1911: sysctl_createv(clog, 0, NULL, NULL,
1912: CTLFLAG_PERMANENT,
1913: CTLTYPE_STRUCT, "stats",
1914: SYSCTL_DESCR("IPv6 statistics"),
1.116 thorpej 1915: sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79 rpaulo 1916: CTL_NET, PF_INET6, IPPROTO_IPV6,
1917: IPV6CTL_STATS, CTL_EOL);
1.81 rpaulo 1918: sysctl_createv(clog, 0, NULL, NULL,
1919: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1920: CTLTYPE_INT, "use_defaultzone",
1921: SYSCTL_DESCR("Whether to use the default scope zones"),
1922: NULL, 0, &ip6_use_defzone, 0,
1923: CTL_NET, PF_INET6, IPPROTO_IPV6,
1924: IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83 rpaulo 1925: sysctl_createv(clog, 0, NULL, NULL,
1926: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1927: CTLTYPE_INT, "mcast_pmtu",
1928: SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1929: NULL, 0, &ip6_mcast_pmtu, 0,
1930: CTL_NET, PF_INET6, IPPROTO_IPV6,
1931: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1932: #ifdef GATEWAY
1933: sysctl_createv(clog, 0, NULL, NULL,
1934: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1935: CTLTYPE_INT, "maxflows",
1936: SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101 liamjfoy 1937: sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98 liamjfoy 1938: CTL_NET, PF_INET6, IPPROTO_IPV6,
1939: CTL_CREATE, CTL_EOL);
1.99 liamjfoy 1940: sysctl_createv(clog, 0, NULL, NULL,
1941: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1942: CTLTYPE_INT, "hashsize",
1943: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1944: sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1945: CTL_NET, PF_INET6, IPPROTO_IPV6,
1946: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1947: #endif
1.2 itojun 1948: }
1.116 thorpej 1949:
1950: void
1951: ip6_statinc(u_int stat)
1952: {
1953:
1954: KASSERT(stat < IP6_NSTATS);
1955: IP6_STATINC(stat);
1956: }
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