Annotation of src/sys/netinet6/ip6_input.c, Revision 1.116
1.116 ! thorpej 1: /* $NetBSD: ip6_input.c,v 1.115 2008/04/08 23:37:43 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>
1.116 ! thorpej 65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.115 2008/04/08 23:37:43 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>
114: #endif
115:
1.94 degroote 116: #ifdef FAST_IPSEC
117: #include <netipsec/ipsec.h>
118: #include <netipsec/ipsec6.h>
119: #include <netipsec/key.h>
120: #endif /* FAST_IPSEC */
121:
1.2 itojun 122: #include <netinet6/ip6protosw.h>
123:
124: #include "faith.h"
125: #include "gif.h"
1.50 itojun 126:
127: #if NGIF > 0
128: #include <netinet6/in6_gif.h>
129: #endif
1.2 itojun 130:
1.9 itojun 131: #include <net/net_osdep.h>
132:
1.2 itojun 133: extern struct domain inet6domain;
134:
135: u_char ip6_protox[IPPROTO_MAX];
136: static int ip6qmaxlen = IFQ_MAXLEN;
137: struct in6_ifaddr *in6_ifaddr;
138: struct ifqueue ip6intrq;
139:
1.108 ad 140: extern callout_t in6_tmpaddrtimer_ch;
1.83 rpaulo 141:
1.2 itojun 142: int ip6_forward_srcrt; /* XXX */
143: int ip6_sourcecheck; /* XXX */
144: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 145:
1.29 thorpej 146: #ifdef PFIL_HOOKS
147: struct pfil_head inet6_pfil_hook;
148: #endif
149:
1.116 ! thorpej 150: percpu_t *ip6stat_percpu;
1.2 itojun 151:
1.111 dyoung 152: static void ip6_init2(void *);
1.112 dyoung 153: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2 itojun 154:
1.111 dyoung 155: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
156: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.2 itojun 157:
158: /*
159: * IP6 initialization: fill in IP6 protocol switch table.
160: * All protocols not implemented in kernel go to raw IP6 protocol handler.
161: */
162: void
1.114 matt 163: ip6_init(void)
1.2 itojun 164: {
1.78 christos 165: const struct ip6protosw *pr;
1.35 itojun 166: int i;
1.2 itojun 167:
1.78 christos 168: pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2 itojun 169: if (pr == 0)
170: panic("ip6_init");
171: for (i = 0; i < IPPROTO_MAX; i++)
172: ip6_protox[i] = pr - inet6sw;
1.78 christos 173: for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
174: pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2 itojun 175: if (pr->pr_domain->dom_family == PF_INET6 &&
176: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
177: ip6_protox[pr->pr_protocol] = pr - inet6sw;
178: ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81 rpaulo 179: scope6_init();
180: addrsel_policy_init();
1.2 itojun 181: nd6_init();
182: frag6_init();
1.83 rpaulo 183: ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2 itojun 184:
185: ip6_init2((void *)0);
1.98 liamjfoy 186: #ifdef GATEWAY
1.99 liamjfoy 187: ip6flow_init(ip6_hashsize);
1.98 liamjfoy 188: #endif
1.29 thorpej 189:
190: #ifdef PFIL_HOOKS
191: /* Register our Packet Filter hook. */
1.33 thorpej 192: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
193: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 194: i = pfil_head_register(&inet6_pfil_hook);
195: if (i != 0)
196: printf("ip6_init: WARNING: unable to register pfil hook, "
197: "error %d\n", i);
198: #endif /* PFIL_HOOKS */
1.116 ! thorpej 199:
! 200: ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2 itojun 201: }
202:
203: static void
1.90 christos 204: ip6_init2(void *dummy)
1.2 itojun 205: {
206:
207: /* nd6_timer_init */
1.108 ad 208: callout_init(&nd6_timer_ch, 0);
1.19 thorpej 209: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83 rpaulo 210:
211: /* timer for regeneranation of temporary addresses randomize ID */
1.108 ad 212: callout_init(&in6_tmpaddrtimer_ch, 0);
1.83 rpaulo 213: callout_reset(&in6_tmpaddrtimer_ch,
214: (ip6_temp_preferred_lifetime - ip6_desync_factor -
215: ip6_temp_regen_advance) * hz,
216: in6_tmpaddrtimer, NULL);
1.2 itojun 217: }
218:
219: /*
220: * IP6 input interrupt handling. Just pass the packet to ip6_input.
221: */
222: void
1.114 matt 223: ip6intr(void)
1.2 itojun 224: {
225: int s;
226: struct mbuf *m;
227:
228: for (;;) {
1.41 thorpej 229: s = splnet();
1.2 itojun 230: IF_DEQUEUE(&ip6intrq, m);
231: splx(s);
232: if (m == 0)
233: return;
1.83 rpaulo 234: /* drop the packet if IPv6 operation is disabled on the IF */
235: if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
236: m_freem(m);
237: return;
238: }
1.2 itojun 239: ip6_input(m);
240: }
241: }
242:
1.103 dyoung 243: extern struct route ip6_forward_rt;
1.2 itojun 244:
245: void
1.96 dyoung 246: ip6_input(struct mbuf *m)
1.2 itojun 247: {
1.9 itojun 248: struct ip6_hdr *ip6;
1.105 dyoung 249: int hit, off = sizeof(struct ip6_hdr), nest;
1.2 itojun 250: u_int32_t plen;
1.5 itojun 251: u_int32_t rtalert = ~0;
1.104 yamt 252: int nxt, ours = 0, rh_present = 0;
1.9 itojun 253: struct ifnet *deliverifp = NULL;
1.64 itojun 254: int srcrt = 0;
1.105 dyoung 255: const struct rtentry *rt;
256: union {
257: struct sockaddr dst;
258: struct sockaddr_in6 dst6;
259: } u;
1.94 degroote 260: #ifdef FAST_IPSEC
261: struct m_tag *mtag;
262: struct tdb_ident *tdbi;
263: struct secpolicy *sp;
264: int s, error;
265: #endif
1.2 itojun 266:
267: #ifdef IPSEC
268: /*
269: * should the inner packet be considered authentic?
270: * see comment in ah4_input().
271: */
1.49 itojun 272: m->m_flags &= ~M_AUTHIPHDR;
273: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 274: #endif
1.9 itojun 275:
1.2 itojun 276: /*
1.81 rpaulo 277: * make sure we don't have onion peering information into m_tag.
278: */
279: ip6_delaux(m);
280:
281: /*
1.44 itojun 282: * mbuf statistics
1.2 itojun 283: */
284: if (m->m_flags & M_EXT) {
285: if (m->m_next)
1.116 ! thorpej 286: IP6_STATINC(IP6_STAT_MEXT2M);
1.2 itojun 287: else
1.116 ! thorpej 288: IP6_STATINC(IP6_STAT_MEXT1);
1.2 itojun 289: } else {
1.115 thorpej 290: #define M2MMAX 32
1.2 itojun 291: if (m->m_next) {
1.9 itojun 292: if (m->m_flags & M_LOOP) {
1.116 ! thorpej 293: /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115 thorpej 294: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116 ! thorpej 295: IP6_STATINC(IP6_STAT_M2M +
! 296: m->m_pkthdr.rcvif->if_index);
1.115 thorpej 297: } else
1.116 ! thorpej 298: IP6_STATINC(IP6_STAT_M2M);
1.2 itojun 299: } else
1.116 ! thorpej 300: IP6_STATINC(IP6_STAT_M1);
1.40 itojun 301: #undef M2MMAX
1.2 itojun 302: }
303:
1.9 itojun 304: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116 ! thorpej 305: IP6_STATINC(IP6_STAT_TOTAL);
1.9 itojun 306:
1.57 thorpej 307: /*
308: * If the IPv6 header is not aligned, slurp it up into a new
309: * mbuf with space for link headers, in the event we forward
1.81 rpaulo 310: * it. Otherwise, if it is aligned, make sure the entire base
1.57 thorpej 311: * IPv6 header is in the first mbuf of the chain.
312: */
1.97 christos 313: if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57 thorpej 314: struct ifnet *inifp = m->m_pkthdr.rcvif;
315: if ((m = m_copyup(m, sizeof(struct ip6_hdr),
316: (max_linkhdr + 3) & ~3)) == NULL) {
317: /* XXXJRT new stat, please */
1.116 ! thorpej 318: IP6_STATINC(IP6_STAT_TOOSMALL);
1.57 thorpej 319: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
320: return;
321: }
322: } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
323: struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55 itojun 324: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116 ! thorpej 325: IP6_STATINC(IP6_STAT_TOOSMALL);
1.9 itojun 326: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
327: return;
328: }
1.2 itojun 329: }
330:
331: ip6 = mtod(m, struct ip6_hdr *);
332:
333: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116 ! thorpej 334: IP6_STATINC(IP6_STAT_BADVERS);
1.9 itojun 335: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 336: goto bad;
337: }
1.15 darrenr 338:
1.98 liamjfoy 339: #if defined(IPSEC)
340: /* IPv6 fast forwarding is not compatible with IPsec. */
341: m->m_flags &= ~M_CANFASTFWD;
342: #else
343: /*
344: * Assume that we can create a fast-forward IP flow entry
345: * based on this packet.
346: */
347: m->m_flags |= M_CANFASTFWD;
348: #endif
349:
1.15 darrenr 350: #ifdef PFIL_HOOKS
351: /*
352: * Run through list of hooks for input packets. If there are any
353: * filters which require that additional packets in the flow are
354: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
355: * Note that filters must _never_ set this flag, as another filter
356: * in the list may have previously cleared it.
357: */
1.39 itojun 358: /*
359: * let ipfilter look at packet on the wire,
360: * not the decapsulated packet.
361: */
362: #ifdef IPSEC
1.42 itojun 363: if (!ipsec_getnhist(m))
1.94 degroote 364: #elif defined(FAST_IPSEC)
365: if (!ipsec_indone(m))
1.39 itojun 366: #else
367: if (1)
368: #endif
369: {
1.64 itojun 370: struct in6_addr odst;
371:
372: odst = ip6->ip6_dst;
1.39 itojun 373: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
374: PFIL_IN) != 0)
375: return;
376: if (m == NULL)
377: return;
378: ip6 = mtod(m, struct ip6_hdr *);
1.64 itojun 379: srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39 itojun 380: }
1.15 darrenr 381: #endif /* PFIL_HOOKS */
382:
1.116 ! thorpej 383: IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2 itojun 384:
1.30 thorpej 385: #ifdef ALTQ
386: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
387: /* packet is dropped by traffic conditioner */
388: return;
1.9 itojun 389: }
390: #endif
391:
1.2 itojun 392: /*
1.44 itojun 393: * Check against address spoofing/corruption.
1.2 itojun 394: */
395: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
396: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55 itojun 397: /*
398: * XXX: "badscope" is not very suitable for a multicast source.
399: */
1.116 ! thorpej 400: IP6_STATINC(IP6_STAT_BADSCOPE);
1.9 itojun 401: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 402: goto bad;
403: }
1.13 itojun 404: /*
1.44 itojun 405: * The following check is not documented in specs. A malicious
406: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
407: * and bypass security checks (act as if it was from 127.0.0.1 by using
408: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 409: *
1.44 itojun 410: * This check chokes if we are in an SIIT cloud. As none of BSDs
411: * support IPv4-less kernel compilation, we cannot support SIIT
412: * environment at all. So, it makes more sense for us to reject any
413: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 414: * partial support for SIIT environment.
1.13 itojun 415: */
416: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
417: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 ! thorpej 418: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 419: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
420: goto bad;
421: }
1.17 itojun 422: #if 0
1.13 itojun 423: /*
1.17 itojun 424: * Reject packets with IPv4 compatible addresses (auto tunnel).
425: *
426: * The code forbids auto tunnel relay case in RFC1933 (the check is
427: * stronger than RFC1933). We may want to re-enable it if mech-xx
428: * is revised to forbid relaying case.
1.13 itojun 429: */
430: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
431: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116 ! thorpej 432: IP6_STATINC(IP6_STAT_BADSCOPE);
1.13 itojun 433: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
434: goto bad;
435: }
436: #endif
1.35 itojun 437:
1.2 itojun 438: /*
1.82 yamt 439: * Disambiguate address scope zones (if there is ambiguity).
440: * We first make sure that the original source or destination address
441: * is not in our internal form for scoped addresses. Such addresses
442: * are not necessarily invalid spec-wise, but we cannot accept them due
443: * to the usage conflict.
444: * in6_setscope() then also checks and rejects the cases where src or
445: * dst are the loopback address and the receiving interface
446: * is not loopback.
447: */
1.88 bouyer 448: if (__predict_false(
449: m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
450: goto bad;
451: ip6 = mtod(m, struct ip6_hdr *);
1.82 yamt 452: if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116 ! thorpej 453: IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82 yamt 454: goto bad;
455: }
456: if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
457: in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116 ! thorpej 458: IP6_STATINC(IP6_STAT_BADSCOPE);
1.82 yamt 459: goto bad;
460: }
461:
462: /*
1.2 itojun 463: * Multicast check
464: */
465: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
466: struct in6_multi *in6m = 0;
1.9 itojun 467:
468: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 469: /*
470: * See if we belong to the destination multicast group on the
471: * arrival interface.
472: */
473: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
474: if (in6m)
475: ours = 1;
476: else if (!ip6_mrouter) {
1.116 ! thorpej 477: uint64_t *ip6s = IP6_STAT_GETREF();
! 478: ip6s[IP6_STAT_NOTMEMBER]++;
! 479: ip6s[IP6_STAT_CANTFORWARD]++;
! 480: IP6_STAT_PUTREF();
1.9 itojun 481: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 482: goto bad;
483: }
1.9 itojun 484: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 485: goto hbhcheck;
486: }
487:
1.105 dyoung 488: sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
489:
1.2 itojun 490: /*
491: * Unicast check
492: */
1.105 dyoung 493: rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
494: if (hit)
1.116 ! thorpej 495: IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93 joerg 496: else
1.116 ! thorpej 497: IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22 itojun 498:
1.109 dyoung 499: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2 itojun 500:
501: /*
502: * Accept the packet if the forwarding interface to the destination
503: * according to the routing table is the loopback interface,
504: * unless the associated route has a gateway.
505: * Note that this approach causes to accept a packet if there is a
506: * route to the loopback interface for the destination of the packet.
507: * But we think it's even useful in some situations, e.g. when using
508: * a special daemon which wants to intercept the packet.
509: */
1.105 dyoung 510: if (rt != NULL &&
511: (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
512: !(rt->rt_flags & RTF_CLONED) &&
1.2 itojun 513: #if 0
514: /*
515: * The check below is redundant since the comparison of
516: * the destination and the key of the rtentry has
517: * already done through looking up the routing table.
518: */
1.109 dyoung 519: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2 itojun 520: #endif
1.105 dyoung 521: rt->rt_ifp->if_type == IFT_LOOP) {
522: struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2 itojun 523: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
524: m->m_flags |= M_ANYCAST6;
1.24 itojun 525: /*
526: * packets to a tentative, duplicated, or somehow invalid
527: * address must not be accepted.
528: */
1.2 itojun 529: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 530: /* this address is ready */
1.2 itojun 531: ours = 1;
1.9 itojun 532: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 533: goto hbhcheck;
534: } else {
1.24 itojun 535: /* address is not ready, so discard the packet. */
1.34 itojun 536: nd6log((LOG_INFO,
1.27 itojun 537: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 538: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 539: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 540:
541: goto bad;
1.2 itojun 542: }
543: }
544:
545: /*
1.55 itojun 546: * FAITH (Firewall Aided Internet Translator)
1.2 itojun 547: */
548: #if defined(NFAITH) && 0 < NFAITH
549: if (ip6_keepfaith) {
1.105 dyoung 550: if (rt != NULL && rt->rt_ifp != NULL &&
551: rt->rt_ifp->if_type == IFT_FAITH) {
1.2 itojun 552: /* XXX do we need more sanity checks? */
553: ours = 1;
1.105 dyoung 554: deliverifp = rt->rt_ifp; /* faith */
1.9 itojun 555: goto hbhcheck;
556: }
557: }
558: #endif
559:
560: #if 0
561: {
562: /*
563: * Last resort: check in6_ifaddr for incoming interface.
564: * The code is here until I update the "goto ours hack" code above
565: * working right.
566: */
567: struct ifaddr *ifa;
1.113 dyoung 568: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9 itojun 569: if (ifa->ifa_addr == NULL)
570: continue; /* just for safety */
571: if (ifa->ifa_addr->sa_family != AF_INET6)
572: continue;
573: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
574: ours = 1;
575: deliverifp = ifa->ifa_ifp;
1.2 itojun 576: goto hbhcheck;
577: }
578: }
1.9 itojun 579: }
1.2 itojun 580: #endif
581:
582: /*
583: * Now there is no reason to process the packet if it's not our own
584: * and we're not a router.
585: */
586: if (!ip6_forwarding) {
1.116 ! thorpej 587: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9 itojun 588: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 589: goto bad;
590: }
591:
592: hbhcheck:
593: /*
1.81 rpaulo 594: * record address information into m_tag, if we don't have one yet.
595: * note that we are unable to record it, if the address is not listed
596: * as our interface address (e.g. multicast addresses, addresses
597: * within FAITH prefixes and such).
598: */
1.111 dyoung 599: if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81 rpaulo 600: struct in6_ifaddr *ia6;
601:
602: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111 dyoung 603: if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
604: /*
605: * XXX maybe we should drop the packet here,
606: * as we could not provide enough information
607: * to the upper layers.
608: */
1.81 rpaulo 609: }
610: }
611:
612: /*
1.2 itojun 613: * Process Hop-by-Hop options header if it's contained.
614: * m may be modified in ip6_hopopts_input().
615: * If a JumboPayload option is included, plen will also be modified.
616: */
617: plen = (u_int32_t)ntohs(ip6->ip6_plen);
618: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 619: struct ip6_hbh *hbh;
620:
621: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
622: #if 0 /*touches NULL pointer*/
623: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
624: #endif
1.2 itojun 625: return; /* m have already been freed */
1.9 itojun 626: }
1.22 itojun 627:
1.2 itojun 628: /* adjust pointer */
629: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 630:
631: /*
1.49 itojun 632: * if the payload length field is 0 and the next header field
1.22 itojun 633: * indicates Hop-by-Hop Options header, then a Jumbo Payload
634: * option MUST be included.
635: */
636: if (ip6->ip6_plen == 0 && plen == 0) {
637: /*
638: * Note that if a valid jumbo payload option is
1.83 rpaulo 639: * contained, ip6_hopopts_input() must set a valid
1.55 itojun 640: * (non-zero) payload length to the variable plen.
1.22 itojun 641: */
1.116 ! thorpej 642: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 643: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
644: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
645: icmp6_error(m, ICMP6_PARAM_PROB,
646: ICMP6_PARAMPROB_HEADER,
1.97 christos 647: (char *)&ip6->ip6_plen - (char *)ip6);
1.22 itojun 648: return;
649: }
1.9 itojun 650: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
651: sizeof(struct ip6_hbh));
652: if (hbh == NULL) {
1.116 ! thorpej 653: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 654: return;
655: }
1.57 thorpej 656: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9 itojun 657: nxt = hbh->ip6h_nxt;
1.2 itojun 658:
659: /*
660: * accept the packet if a router alert option is included
661: * and we act as an IPv6 router.
662: */
1.5 itojun 663: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 664: ours = 1;
665: } else
666: nxt = ip6->ip6_nxt;
667:
668: /*
669: * Check that the amount of data in the buffers
670: * is as at least much as the IPv6 header would have us expect.
671: * Trim mbufs if longer than we expect.
672: * Drop packet if shorter than we expect.
673: */
674: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116 ! thorpej 675: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 676: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 677: goto bad;
678: }
679: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
680: if (m->m_len == m->m_pkthdr.len) {
681: m->m_len = sizeof(struct ip6_hdr) + plen;
682: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
683: } else
684: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
685: }
686:
687: /*
688: * Forward if desirable.
689: */
690: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
691: /*
692: * If we are acting as a multicast router, all
693: * incoming multicast packets are passed to the
694: * kernel-level multicast forwarding function.
695: * The packet is returned (relatively) intact; if
696: * ip6_mforward() returns a non-zero value, the packet
697: * must be discarded, else it may be accepted below.
698: */
699: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116 ! thorpej 700: IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2 itojun 701: m_freem(m);
702: return;
703: }
704: if (!ours) {
705: m_freem(m);
706: return;
707: }
1.22 itojun 708: } else if (!ours) {
1.64 itojun 709: ip6_forward(m, srcrt);
1.2 itojun 710: return;
1.56 itojun 711: }
1.25 itojun 712:
713: ip6 = mtod(m, struct ip6_hdr *);
714:
715: /*
716: * Malicious party may be able to use IPv4 mapped addr to confuse
717: * tcp/udp stack and bypass security checks (act as if it was from
718: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
719: *
720: * For SIIT end node behavior, you may want to disable the check.
721: * However, you will become vulnerable to attacks using IPv4 mapped
722: * source.
723: */
724: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
725: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116 ! thorpej 726: IP6_STATINC(IP6_STAT_BADSCOPE);
1.25 itojun 727: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
728: goto bad;
729: }
1.2 itojun 730:
731: /*
732: * Tell launch routine the next header
733: */
1.12 itojun 734: #ifdef IFA_STATS
1.28 itojun 735: if (deliverifp != NULL) {
1.9 itojun 736: struct in6_ifaddr *ia6;
737: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
738: if (ia6)
739: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
740: }
741: #endif
1.116 ! thorpej 742: IP6_STATINC(IP6_STAT_DELIVERED);
1.9 itojun 743: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 744: nest = 0;
1.40 itojun 745:
1.104 yamt 746: rh_present = 0;
1.2 itojun 747: while (nxt != IPPROTO_DONE) {
748: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116 ! thorpej 749: IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104 yamt 750: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 751: goto bad;
752: }
1.8 itojun 753:
754: /*
755: * protection against faulty packet - there should be
756: * more sanity checks in header chain processing.
757: */
758: if (m->m_pkthdr.len < off) {
1.116 ! thorpej 759: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 760: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 761: goto bad;
762: }
763:
1.104 yamt 764: if (nxt == IPPROTO_ROUTING) {
765: if (rh_present++) {
766: in6_ifstat_inc(m->m_pkthdr.rcvif,
767: ifs6_in_hdrerr);
1.116 ! thorpej 768: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104 yamt 769: goto bad;
770: }
771: }
772:
1.37 itojun 773: #ifdef IPSEC
774: /*
775: * enforce IPsec policy checking if we are seeing last header.
776: * note that we do not visit this with protocols with pcb layer
777: * code - like udp/tcp/raw ip.
778: */
779: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
780: ipsec6_in_reject(m, NULL)) {
781: ipsec6stat.in_polvio++;
782: goto bad;
783: }
784: #endif
1.94 degroote 785: #ifdef FAST_IPSEC
786: /*
787: * enforce IPsec policy checking if we are seeing last header.
788: * note that we do not visit this with protocols with pcb layer
789: * code - like udp/tcp/raw ip.
790: */
791: if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
792: /*
793: * Check if the packet has already had IPsec processing
794: * done. If so, then just pass it along. This tag gets
795: * set during AH, ESP, etc. input handling, before the
796: * packet is returned to the ip input queue for delivery.
797: */
798: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
799: s = splsoftnet();
800: if (mtag != NULL) {
801: tdbi = (struct tdb_ident *)(mtag + 1);
802: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
803: } else {
804: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
805: IP_FORWARDING, &error);
806: }
807: if (sp != NULL) {
808: /*
809: * Check security policy against packet attributes.
810: */
811: error = ipsec_in_reject(sp, m);
812: KEY_FREESP(&sp);
813: } else {
814: /* XXX error stat??? */
815: error = EINVAL;
816: DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
817: }
818: splx(s);
819: if (error)
820: goto bad;
821: }
822: #endif /* FAST_IPSEC */
823:
1.56 itojun 824:
1.2 itojun 825: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
826: }
827: return;
828: bad:
829: m_freem(m);
830: }
831:
832: /*
1.81 rpaulo 833: * set/grab in6_ifaddr correspond to IPv6 destination address.
834: */
835: static struct m_tag *
1.112 dyoung 836: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81 rpaulo 837: {
838: struct m_tag *mtag;
839:
840: mtag = ip6_addaux(m);
1.112 dyoung 841: if (mtag != NULL) {
842: struct ip6aux *ip6a;
843:
844: ip6a = (struct ip6aux *)(mtag + 1);
845: in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
846: ip6a->ip6a_src = ia->ia_addr.sin6_addr;
847: ip6a->ip6a_flags = ia->ia6_flags;
848: }
1.81 rpaulo 849: return mtag; /* NULL if failed to set */
850: }
851:
1.112 dyoung 852: const struct ip6aux *
1.107 christos 853: ip6_getdstifaddr(struct mbuf *m)
1.81 rpaulo 854: {
855: struct m_tag *mtag;
856:
857: mtag = ip6_findaux(m);
1.112 dyoung 858: if (mtag != NULL)
859: return (struct ip6aux *)(mtag + 1);
1.81 rpaulo 860: else
861: return NULL;
862: }
863:
864: /*
1.2 itojun 865: * Hop-by-Hop options header processing. If a valid jumbo payload option is
866: * included, the real payload length will be stored in plenp.
1.107 christos 867: *
868: * rtalertp - XXX: should be stored more smart way
1.2 itojun 869: */
870: static int
1.107 christos 871: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
872: struct mbuf **mp, int *offp)
1.2 itojun 873: {
1.35 itojun 874: struct mbuf *m = *mp;
1.2 itojun 875: int off = *offp, hbhlen;
876: struct ip6_hbh *hbh;
877:
878: /* validation of the length of the header */
1.9 itojun 879: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
880: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
881: if (hbh == NULL) {
1.116 ! thorpej 882: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 883: return -1;
884: }
885: hbhlen = (hbh->ip6h_len + 1) << 3;
886: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
887: hbhlen);
888: if (hbh == NULL) {
1.116 ! thorpej 889: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 890: return -1;
891: }
1.57 thorpej 892: KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2 itojun 893: off += hbhlen;
894: hbhlen -= sizeof(struct ip6_hbh);
895:
896: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
897: hbhlen, rtalertp, plenp) < 0)
1.58 itojun 898: return (-1);
1.2 itojun 899:
900: *offp = off;
901: *mp = m;
1.58 itojun 902: return (0);
1.2 itojun 903: }
904:
905: /*
906: * Search header for all Hop-by-hop options and process each option.
907: * This function is separate from ip6_hopopts_input() in order to
908: * handle a case where the sending node itself process its hop-by-hop
909: * options header. In such a case, the function is called from ip6_output().
1.55 itojun 910: *
911: * The function assumes that hbh header is located right after the IPv6 header
912: * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
913: * opthead + hbhlen is located in continuous memory region.
1.2 itojun 914: */
915: int
1.107 christos 916: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
917: u_int32_t *rtalertp, u_int32_t *plenp)
1.2 itojun 918: {
919: struct ip6_hdr *ip6;
920: int optlen = 0;
921: u_int8_t *opt = opthead;
922: u_int16_t rtalert_val;
1.22 itojun 923: u_int32_t jumboplen;
1.55 itojun 924: const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2 itojun 925:
926: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 927: switch (*opt) {
928: case IP6OPT_PAD1:
929: optlen = 1;
930: break;
931: case IP6OPT_PADN:
932: if (hbhlen < IP6OPT_MINLEN) {
1.116 ! thorpej 933: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 934: goto bad;
935: }
936: optlen = *(opt + 1) + 2;
937: break;
938: case IP6OPT_RTALERT:
939: /* XXX may need check for alignment */
940: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116 ! thorpej 941: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 942: goto bad;
943: }
944: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55 itojun 945: /* XXX stat */
946: icmp6_error(m, ICMP6_PARAM_PROB,
947: ICMP6_PARAMPROB_HEADER,
948: erroff + opt + 1 - opthead);
949: return (-1);
1.35 itojun 950: }
951: optlen = IP6OPT_RTALERT_LEN;
1.97 christos 952: bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35 itojun 953: *rtalertp = ntohs(rtalert_val);
954: break;
955: case IP6OPT_JUMBO:
1.22 itojun 956: /* XXX may need check for alignment */
957: if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116 ! thorpej 958: IP6_STATINC(IP6_STAT_TOOSMALL);
1.22 itojun 959: goto bad;
960: }
1.35 itojun 961: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55 itojun 962: /* XXX stat */
963: icmp6_error(m, ICMP6_PARAM_PROB,
964: ICMP6_PARAMPROB_HEADER,
965: erroff + opt + 1 - opthead);
966: return (-1);
1.35 itojun 967: }
1.22 itojun 968: optlen = IP6OPT_JUMBO_LEN;
969:
970: /*
971: * IPv6 packets that have non 0 payload length
1.35 itojun 972: * must not contain a jumbo payload option.
1.22 itojun 973: */
974: ip6 = mtod(m, struct ip6_hdr *);
975: if (ip6->ip6_plen) {
1.116 ! thorpej 976: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 977: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 978: ICMP6_PARAMPROB_HEADER,
979: erroff + opt - opthead);
980: return (-1);
1.22 itojun 981: }
1.2 itojun 982:
1.22 itojun 983: /*
984: * We may see jumbolen in unaligned location, so
985: * we'd need to perform bcopy().
986: */
987: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
988: jumboplen = (u_int32_t)htonl(jumboplen);
989:
990: #if 1
991: /*
992: * if there are multiple jumbo payload options,
993: * *plenp will be non-zero and the packet will be
994: * rejected.
995: * the behavior may need some debate in ipngwg -
996: * multiple options does not make sense, however,
997: * there's no explicit mention in specification.
998: */
999: if (*plenp != 0) {
1.116 ! thorpej 1000: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1001: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1002: ICMP6_PARAMPROB_HEADER,
1003: erroff + opt + 2 - opthead);
1004: return (-1);
1.22 itojun 1005: }
1.8 itojun 1006: #endif
1.2 itojun 1007:
1.22 itojun 1008: /*
1009: * jumbo payload length must be larger than 65535.
1010: */
1011: if (jumboplen <= IPV6_MAXPACKET) {
1.116 ! thorpej 1012: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22 itojun 1013: icmp6_error(m, ICMP6_PARAM_PROB,
1.55 itojun 1014: ICMP6_PARAMPROB_HEADER,
1015: erroff + opt + 2 - opthead);
1016: return (-1);
1.22 itojun 1017: }
1018: *plenp = jumboplen;
1019:
1020: break;
1.35 itojun 1021: default: /* unknown option */
1022: if (hbhlen < IP6OPT_MINLEN) {
1.116 ! thorpej 1023: IP6_STATINC(IP6_STAT_TOOSMALL);
1.35 itojun 1024: goto bad;
1025: }
1.55 itojun 1026: optlen = ip6_unknown_opt(opt, m,
1027: erroff + opt - opthead);
1028: if (optlen == -1)
1029: return (-1);
1.35 itojun 1030: optlen += 2;
1031: break;
1.2 itojun 1032: }
1033: }
1034:
1.55 itojun 1035: return (0);
1.2 itojun 1036:
1037: bad:
1038: m_freem(m);
1.55 itojun 1039: return (-1);
1.2 itojun 1040: }
1041:
1042: /*
1043: * Unknown option processing.
1044: * The third argument `off' is the offset from the IPv6 header to the option,
1045: * which is necessary if the IPv6 header the and option header and IPv6 header
1046: * is not continuous in order to return an ICMPv6 error.
1047: */
1048: int
1.107 christos 1049: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2 itojun 1050: {
1051: struct ip6_hdr *ip6;
1052:
1.35 itojun 1053: switch (IP6OPT_TYPE(*optp)) {
1054: case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58 itojun 1055: return ((int)*(optp + 1));
1.35 itojun 1056: case IP6OPT_TYPE_DISCARD: /* silently discard */
1057: m_freem(m);
1.58 itojun 1058: return (-1);
1.35 itojun 1059: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116 ! thorpej 1060: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1061: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1062: return (-1);
1.35 itojun 1063: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116 ! thorpej 1064: IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35 itojun 1065: ip6 = mtod(m, struct ip6_hdr *);
1066: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1067: (m->m_flags & (M_BCAST|M_MCAST)))
1068: m_freem(m);
1069: else
1070: icmp6_error(m, ICMP6_PARAM_PROB,
1071: ICMP6_PARAMPROB_OPTION, off);
1.58 itojun 1072: return (-1);
1.2 itojun 1073: }
1074:
1075: m_freem(m); /* XXX: NOTREACHED */
1.58 itojun 1076: return (-1);
1.2 itojun 1077: }
1078:
1079: /*
1.9 itojun 1080: * Create the "control" list for this pcb.
1081: *
1082: * The routine will be called from upper layer handlers like tcp6_input().
1083: * Thus the routine assumes that the caller (tcp6_input) have already
1084: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1085: * very first mbuf on the mbuf chain.
1086: * We may want to add some infinite loop prevention or sanity checks for safety.
1087: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1088: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1089: */
1090: void
1.107 christos 1091: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1092: struct ip6_hdr *ip6, struct mbuf *m)
1.2 itojun 1093: {
1.85 rpaulo 1094: #ifdef RFC2292
1095: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1096: #else
1097: #define IS2292(x, y) (y)
1098: #endif
1099:
1.9 itojun 1100: #ifdef SO_TIMESTAMP
1.2 itojun 1101: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1102: struct timeval tv;
1103:
1104: microtime(&tv);
1.97 christos 1105: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63 itojun 1106: SCM_TIMESTAMP, SOL_SOCKET);
1.2 itojun 1107: if (*mp)
1108: mp = &(*mp)->m_next;
1109: }
1.9 itojun 1110: #endif
1.87 rpaulo 1111:
1112: /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1113: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1114: return;
1115:
1.2 itojun 1116: /* RFC 2292 sec. 5 */
1.35 itojun 1117: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1118: struct in6_pktinfo pi6;
1.85 rpaulo 1119:
1.2 itojun 1120: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81 rpaulo 1121: in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84 christos 1122: pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1123: m->m_pkthdr.rcvif->if_index : 0;
1.97 christos 1124: *mp = sbcreatecontrol((void *) &pi6,
1.85 rpaulo 1125: sizeof(struct in6_pktinfo),
1126: IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2 itojun 1127: if (*mp)
1128: mp = &(*mp)->m_next;
1129: }
1.85 rpaulo 1130:
1.2 itojun 1131: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1132: int hlim = ip6->ip6_hlim & 0xff;
1.85 rpaulo 1133:
1.97 christos 1134: *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85 rpaulo 1135: IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1136: if (*mp)
1137: mp = &(*mp)->m_next;
1138: }
1139:
1140: if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1141: u_int32_t flowinfo;
1142: int tclass;
1143:
1144: flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1145: flowinfo >>= 20;
1146:
1147: tclass = flowinfo & 0xff;
1.97 christos 1148: *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85 rpaulo 1149: IPV6_TCLASS, IPPROTO_IPV6);
1150:
1.2 itojun 1151: if (*mp)
1152: mp = &(*mp)->m_next;
1153: }
1154:
1155: /*
1.75 itojun 1156: * IPV6_HOPOPTS socket option. Recall that we required super-user
1157: * privilege for the option (see ip6_ctloutput), but it might be too
1158: * strict, since there might be some hop-by-hop options which can be
1159: * returned to normal user.
1.85 rpaulo 1160: * See also RFC3542 section 8 (or RFC2292 section 6).
1.2 itojun 1161: */
1.75 itojun 1162: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2 itojun 1163: /*
1164: * Check if a hop-by-hop options header is contatined in the
1165: * received packet, and if so, store the options as ancillary
1166: * data. Note that a hop-by-hop options header must be
1167: * just after the IPv6 header, which fact is assured through
1168: * the IPv6 input processing.
1169: */
1.78 christos 1170: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1171: if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1172: struct ip6_hbh *hbh;
1173: int hbhlen;
1.62 itojun 1174: struct mbuf *ext;
1.9 itojun 1175:
1.62 itojun 1176: ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78 christos 1177: xip6->ip6_nxt);
1.62 itojun 1178: if (ext == NULL) {
1.116 ! thorpej 1179: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1180: return;
1181: }
1.62 itojun 1182: hbh = mtod(ext, struct ip6_hbh *);
1.9 itojun 1183: hbhlen = (hbh->ip6h_len + 1) << 3;
1.62 itojun 1184: if (hbhlen != ext->m_len) {
1185: m_freem(ext);
1.116 ! thorpej 1186: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1187: return;
1188: }
1.2 itojun 1189:
1190: /*
1191: * XXX: We copy whole the header even if a jumbo
1192: * payload option is included, which option is to
1193: * be removed before returning in the RFC 2292.
1.85 rpaulo 1194: * Note: this constraint is removed in RFC3542.
1.2 itojun 1195: */
1.97 christos 1196: *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85 rpaulo 1197: IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1198: IPPROTO_IPV6);
1.2 itojun 1199: if (*mp)
1200: mp = &(*mp)->m_next;
1.62 itojun 1201: m_freem(ext);
1.2 itojun 1202: }
1203: }
1204:
1205: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1206: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78 christos 1207: struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1208: int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2 itojun 1209:
1210: /*
1211: * Search for destination options headers or routing
1212: * header(s) through the header chain, and stores each
1213: * header as ancillary data.
1214: * Note that the order of the headers remains in
1215: * the chain of ancillary data.
1216: */
1.86 rpaulo 1217: for (;;) { /* is explicit loop prevention necessary? */
1.62 itojun 1218: struct ip6_ext *ip6e = NULL;
1.9 itojun 1219: int elen;
1.62 itojun 1220: struct mbuf *ext = NULL;
1.9 itojun 1221:
1.62 itojun 1222: /*
1223: * if it is not an extension header, don't try to
1224: * pull it from the chain.
1225: */
1226: switch (nxt) {
1227: case IPPROTO_DSTOPTS:
1228: case IPPROTO_ROUTING:
1229: case IPPROTO_HOPOPTS:
1230: case IPPROTO_AH: /* is it possible? */
1231: break;
1232: default:
1233: goto loopend;
1234: }
1235:
1236: ext = ip6_pullexthdr(m, off, nxt);
1237: if (ext == NULL) {
1.116 ! thorpej 1238: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1239: return;
1240: }
1.62 itojun 1241: ip6e = mtod(ext, struct ip6_ext *);
1.9 itojun 1242: if (nxt == IPPROTO_AH)
1243: elen = (ip6e->ip6e_len + 2) << 2;
1244: else
1245: elen = (ip6e->ip6e_len + 1) << 3;
1.62 itojun 1246: if (elen != ext->m_len) {
1247: m_freem(ext);
1.116 ! thorpej 1248: IP6_STATINC(IP6_STAT_TOOSHORT);
1.9 itojun 1249: return;
1250: }
1.57 thorpej 1251: KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2 itojun 1252:
1.35 itojun 1253: switch (nxt) {
1.62 itojun 1254: case IPPROTO_DSTOPTS:
1.35 itojun 1255: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1256: break;
1257:
1.97 christos 1258: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1259: IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1260: IPPROTO_IPV6);
1.35 itojun 1261: if (*mp)
1262: mp = &(*mp)->m_next;
1263: break;
1264:
1265: case IPPROTO_ROUTING:
1266: if (!in6p->in6p_flags & IN6P_RTHDR)
1267: break;
1268:
1.97 christos 1269: *mp = sbcreatecontrol((void *)ip6e, elen,
1.85 rpaulo 1270: IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1271: IPPROTO_IPV6);
1.35 itojun 1272: if (*mp)
1273: mp = &(*mp)->m_next;
1274: break;
1275:
1.62 itojun 1276: case IPPROTO_HOPOPTS:
1277: case IPPROTO_AH: /* is it possible? */
1278: break;
1279:
1.35 itojun 1280: default:
1281: /*
1.62 itojun 1282: * other cases have been filtered in the above.
1283: * none will visit this case. here we supply
1284: * the code just in case (nxt overwritten or
1285: * other cases).
1.35 itojun 1286: */
1.62 itojun 1287: m_freem(ext);
1.35 itojun 1288: goto loopend;
1289:
1.2 itojun 1290: }
1291:
1292: /* proceed with the next header. */
1.9 itojun 1293: off += elen;
1.2 itojun 1294: nxt = ip6e->ip6e_nxt;
1.62 itojun 1295: ip6e = NULL;
1296: m_freem(ext);
1297: ext = NULL;
1.2 itojun 1298: }
1299: loopend:
1.62 itojun 1300: ;
1.2 itojun 1301: }
1.62 itojun 1302: }
1.85 rpaulo 1303: #undef IS2292
1304:
1305:
1306: void
1.95 dyoung 1307: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1308: uint32_t *mtu)
1.85 rpaulo 1309: {
1310: struct socket *so;
1311: struct mbuf *m_mtu;
1312: struct ip6_mtuinfo mtuctl;
1313:
1314: so = in6p->in6p_socket;
1315:
1316: if (mtu == NULL)
1317: return;
1318:
1319: #ifdef DIAGNOSTIC
1320: if (so == NULL) /* I believe this is impossible */
1321: panic("ip6_notify_pmtu: socket is NULL");
1322: #endif
1323:
1324: memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1325: mtuctl.ip6m_mtu = *mtu;
1326: mtuctl.ip6m_addr = *dst;
1327: if (sa6_recoverscope(&mtuctl.ip6m_addr))
1328: return;
1329:
1.97 christos 1330: if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85 rpaulo 1331: IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1332: return;
1333:
1.95 dyoung 1334: if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85 rpaulo 1335: == 0) {
1336: m_freem(m_mtu);
1337: /* XXX: should count statistics */
1338: } else
1339: sorwakeup(so);
1340:
1341: return;
1342: }
1.62 itojun 1343:
1344: /*
1345: * pull single extension header from mbuf chain. returns single mbuf that
1346: * contains the result, or NULL on error.
1347: */
1348: static struct mbuf *
1.107 christos 1349: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62 itojun 1350: {
1351: struct ip6_ext ip6e;
1352: size_t elen;
1353: struct mbuf *n;
1354:
1355: #ifdef DIAGNOSTIC
1356: switch (nxt) {
1357: case IPPROTO_DSTOPTS:
1358: case IPPROTO_ROUTING:
1359: case IPPROTO_HOPOPTS:
1360: case IPPROTO_AH: /* is it possible? */
1361: break;
1362: default:
1363: printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2 itojun 1364: }
1.62 itojun 1365: #endif
1.2 itojun 1366:
1.97 christos 1367: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62 itojun 1368: if (nxt == IPPROTO_AH)
1369: elen = (ip6e.ip6e_len + 2) << 2;
1370: else
1371: elen = (ip6e.ip6e_len + 1) << 3;
1372:
1373: MGET(n, M_DONTWAIT, MT_DATA);
1374: if (n && elen >= MLEN) {
1375: MCLGET(n, M_DONTWAIT);
1376: if ((n->m_flags & M_EXT) == 0) {
1377: m_free(n);
1378: n = NULL;
1379: }
1380: }
1381: if (!n)
1382: return NULL;
1383:
1384: n->m_len = 0;
1385: if (elen >= M_TRAILINGSPACE(n)) {
1386: m_free(n);
1387: return NULL;
1388: }
1389:
1.97 christos 1390: m_copydata(m, off, elen, mtod(n, void *));
1.62 itojun 1391: n->m_len = elen;
1392: return n;
1.2 itojun 1393: }
1394:
1395: /*
1396: * Get pointer to the previous header followed by the header
1397: * currently processed.
1398: * XXX: This function supposes that
1399: * M includes all headers,
1400: * the next header field and the header length field of each header
1401: * are valid, and
1402: * the sum of each header length equals to OFF.
1403: * Because of these assumptions, this function must be called very
1404: * carefully. Moreover, it will not be used in the near future when
1405: * we develop `neater' mechanism to process extension headers.
1406: */
1.58 itojun 1407: u_int8_t *
1.107 christos 1408: ip6_get_prevhdr(struct mbuf *m, int off)
1.2 itojun 1409: {
1410: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1411:
1412: if (off == sizeof(struct ip6_hdr))
1.58 itojun 1413: return (&ip6->ip6_nxt);
1.2 itojun 1414: else {
1415: int len, nxt;
1416: struct ip6_ext *ip6e = NULL;
1417:
1418: nxt = ip6->ip6_nxt;
1419: len = sizeof(struct ip6_hdr);
1420: while (len < off) {
1.97 christos 1421: ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2 itojun 1422:
1.35 itojun 1423: switch (nxt) {
1.2 itojun 1424: case IPPROTO_FRAGMENT:
1425: len += sizeof(struct ip6_frag);
1426: break;
1427: case IPPROTO_AH:
1428: len += (ip6e->ip6e_len + 2) << 2;
1429: break;
1430: default:
1431: len += (ip6e->ip6e_len + 1) << 3;
1432: break;
1433: }
1434: nxt = ip6e->ip6e_nxt;
1435: }
1436: if (ip6e)
1.58 itojun 1437: return (&ip6e->ip6e_nxt);
1.2 itojun 1438: else
1439: return NULL;
1.18 itojun 1440: }
1441: }
1442:
1443: /*
1444: * get next header offset. m will be retained.
1445: */
1446: int
1.107 christos 1447: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1448: {
1449: struct ip6_hdr ip6;
1450: struct ip6_ext ip6e;
1451: struct ip6_frag fh;
1452:
1453: /* just in case */
1454: if (m == NULL)
1455: panic("ip6_nexthdr: m == NULL");
1456: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1457: return -1;
1458:
1459: switch (proto) {
1460: case IPPROTO_IPV6:
1.83 rpaulo 1461: /* do not chase beyond intermediate IPv6 headers */
1462: if (off != 0)
1463: return -1;
1.18 itojun 1464: if (m->m_pkthdr.len < off + sizeof(ip6))
1465: return -1;
1.97 christos 1466: m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18 itojun 1467: if (nxtp)
1468: *nxtp = ip6.ip6_nxt;
1469: off += sizeof(ip6);
1470: return off;
1471:
1472: case IPPROTO_FRAGMENT:
1473: /*
1474: * terminate parsing if it is not the first fragment,
1475: * it does not make sense to parse through it.
1476: */
1477: if (m->m_pkthdr.len < off + sizeof(fh))
1478: return -1;
1.97 christos 1479: m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67 itojun 1480: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1481: return -1;
1482: if (nxtp)
1483: *nxtp = fh.ip6f_nxt;
1484: off += sizeof(struct ip6_frag);
1485: return off;
1486:
1487: case IPPROTO_AH:
1488: if (m->m_pkthdr.len < off + sizeof(ip6e))
1489: return -1;
1.97 christos 1490: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1491: if (nxtp)
1492: *nxtp = ip6e.ip6e_nxt;
1493: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1494: if (m->m_pkthdr.len < off)
1495: return -1;
1.18 itojun 1496: return off;
1497:
1498: case IPPROTO_HOPOPTS:
1499: case IPPROTO_ROUTING:
1500: case IPPROTO_DSTOPTS:
1501: if (m->m_pkthdr.len < off + sizeof(ip6e))
1502: return -1;
1.97 christos 1503: m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18 itojun 1504: if (nxtp)
1505: *nxtp = ip6e.ip6e_nxt;
1506: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1507: if (m->m_pkthdr.len < off)
1508: return -1;
1.18 itojun 1509: return off;
1510:
1511: case IPPROTO_NONE:
1512: case IPPROTO_ESP:
1513: case IPPROTO_IPCOMP:
1514: /* give up */
1515: return -1;
1516:
1517: default:
1518: return -1;
1519: }
1520: }
1521:
1522: /*
1523: * get offset for the last header in the chain. m will be kept untainted.
1524: */
1525: int
1.107 christos 1526: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18 itojun 1527: {
1528: int newoff;
1529: int nxt;
1530:
1531: if (!nxtp) {
1532: nxt = -1;
1533: nxtp = &nxt;
1534: }
1.86 rpaulo 1535: for (;;) {
1.18 itojun 1536: newoff = ip6_nexthdr(m, off, proto, nxtp);
1537: if (newoff < 0)
1538: return off;
1539: else if (newoff < off)
1540: return -1; /* invalid */
1541: else if (newoff == off)
1542: return newoff;
1543:
1544: off = newoff;
1545: proto = *nxtp;
1.2 itojun 1546: }
1547: }
1548:
1.81 rpaulo 1549: struct m_tag *
1.107 christos 1550: ip6_addaux(struct mbuf *m)
1.81 rpaulo 1551: {
1552: struct m_tag *mtag;
1553:
1554: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1555: if (!mtag) {
1556: mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1557: M_NOWAIT);
1558: if (mtag) {
1559: m_tag_prepend(m, mtag);
1560: bzero(mtag + 1, sizeof(struct ip6aux));
1561: }
1562: }
1563: return mtag;
1564: }
1565:
1566: struct m_tag *
1.107 christos 1567: ip6_findaux(struct mbuf *m)
1.81 rpaulo 1568: {
1569: struct m_tag *mtag;
1570:
1571: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1572: return mtag;
1573: }
1574:
1575: void
1.107 christos 1576: ip6_delaux(struct mbuf *m)
1.81 rpaulo 1577: {
1578: struct m_tag *mtag;
1579:
1580: mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1581: if (mtag)
1582: m_tag_delete(m, mtag);
1583: }
1584:
1.98 liamjfoy 1585: #ifdef GATEWAY
1586: /*
1587: * sysctl helper routine for net.inet.ip6.maxflows. Since
1588: * we could reduce this value, call ip6flow_reap();
1589: */
1590: static int
1.101 liamjfoy 1591: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98 liamjfoy 1592: {
1593: int s;
1594:
1595: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.100 liamjfoy 1596: if (s || newp == NULL)
1.98 liamjfoy 1597: return (s);
1598:
1599: s = splsoftnet();
1600: ip6flow_reap(0);
1601: splx(s);
1602:
1603: return (0);
1604: }
1.99 liamjfoy 1605:
1606: static int
1607: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1608: {
1609: int error, tmp;
1610: struct sysctlnode node;
1611:
1612: node = *rnode;
1613: tmp = ip6_hashsize;
1614: node.sysctl_data = &tmp;
1615: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1616: if (error || newp == NULL)
1617: return (error);
1618:
1619: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1620: /*
1621: * Can only fail due to malloc()
1622: */
1623: if (ip6flow_invalidate_all(tmp))
1624: return ENOMEM;
1625: } else {
1626: /*
1627: * EINVAL if not a power of 2
1628: */
1629: return EINVAL;
1630: }
1631:
1632: return (0);
1633: }
1.98 liamjfoy 1634: #endif /* GATEWAY */
1635:
1.2 itojun 1636: /*
1637: * System control for IP6
1638: */
1639:
1640: u_char inet6ctlerrmap[PRC_NCMDS] = {
1641: 0, 0, 0, 0,
1642: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1643: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1644: EMSGSIZE, EHOSTUNREACH, 0, 0,
1645: 0, 0, 0, 0,
1646: ENOPROTOOPT
1647: };
1648:
1.116 ! thorpej 1649: static void
! 1650: ip6stat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
! 1651: {
! 1652: uint64_t *ip6sc = v1;
! 1653: uint64_t *ip6s = v2;
! 1654: u_int i;
! 1655:
! 1656: for (i = 0; i < IP6_NSTATS; i++)
! 1657: ip6s[i] += ip6sc[i];
! 1658: }
! 1659:
! 1660: static void
! 1661: ip6stat_convert_to_user(uint64_t *ip6s)
! 1662: {
! 1663:
! 1664: memset(ip6s, 0, sizeof(uint64_t) * IP6_NSTATS);
! 1665: percpu_foreach(ip6stat_percpu, ip6stat_convert_to_user_cb, ip6s);
! 1666: }
! 1667:
! 1668: static int
! 1669: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
! 1670: {
! 1671: struct sysctlnode node;
! 1672: uint64_t ip6s[IP6_NSTATS];
! 1673:
! 1674: ip6stat_convert_to_user(ip6s);
! 1675: node = *rnode;
! 1676: node.sysctl_data = ip6s;
! 1677: node.sysctl_size = sizeof(ip6s);
! 1678: return (sysctl_lookup(SYSCTLFN_CALL(&node)));
! 1679: }
! 1680:
1.70 atatat 1681: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2 itojun 1682: {
1.85 rpaulo 1683: #ifdef RFC2292
1684: #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1685: #else
1686: #define IS2292(x, y) (y)
1687: #endif
1.26 itojun 1688:
1.73 atatat 1689: sysctl_createv(clog, 0, NULL, NULL,
1690: CTLFLAG_PERMANENT,
1.70 atatat 1691: CTLTYPE_NODE, "net", NULL,
1692: NULL, 0, NULL, 0,
1693: CTL_NET, CTL_EOL);
1.73 atatat 1694: sysctl_createv(clog, 0, NULL, NULL,
1695: CTLFLAG_PERMANENT,
1.74 atatat 1696: CTLTYPE_NODE, "inet6",
1697: SYSCTL_DESCR("PF_INET6 related settings"),
1.70 atatat 1698: NULL, 0, NULL, 0,
1699: CTL_NET, PF_INET6, CTL_EOL);
1.73 atatat 1700: sysctl_createv(clog, 0, NULL, NULL,
1701: CTLFLAG_PERMANENT,
1.74 atatat 1702: CTLTYPE_NODE, "ip6",
1703: SYSCTL_DESCR("IPv6 related settings"),
1.70 atatat 1704: NULL, 0, NULL, 0,
1705: CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1706:
1.73 atatat 1707: sysctl_createv(clog, 0, NULL, NULL,
1708: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1709: CTLTYPE_INT, "forwarding",
1710: SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70 atatat 1711: NULL, 0, &ip6_forwarding, 0,
1712: CTL_NET, PF_INET6, IPPROTO_IPV6,
1713: IPV6CTL_FORWARDING, CTL_EOL);
1.73 atatat 1714: sysctl_createv(clog, 0, NULL, NULL,
1715: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1716: CTLTYPE_INT, "redirect",
1717: SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70 atatat 1718: NULL, 0, &ip6_sendredirects, 0,
1719: CTL_NET, PF_INET6, IPPROTO_IPV6,
1720: IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73 atatat 1721: sysctl_createv(clog, 0, NULL, NULL,
1722: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1723: CTLTYPE_INT, "hlim",
1724: SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70 atatat 1725: NULL, 0, &ip6_defhlim, 0,
1726: CTL_NET, PF_INET6, IPPROTO_IPV6,
1727: IPV6CTL_DEFHLIM, CTL_EOL);
1728: #ifdef notyet
1.73 atatat 1729: sysctl_createv(clog, 0, NULL, NULL,
1730: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1731: CTLTYPE_INT, "mtu", NULL,
1732: NULL, 0, &, 0,
1733: CTL_NET, PF_INET6, IPPROTO_IPV6,
1734: IPV6CTL_DEFMTU, CTL_EOL);
1735: #endif
1736: #ifdef __no_idea__
1.73 atatat 1737: sysctl_createv(clog, 0, NULL, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1739: CTLTYPE_INT, "forwsrcrt", NULL,
1740: NULL, 0, &?, 0,
1741: CTL_NET, PF_INET6, IPPROTO_IPV6,
1742: IPV6CTL_FORWSRCRT, CTL_EOL);
1.73 atatat 1743: sysctl_createv(clog, 0, NULL, NULL,
1744: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1745: CTLTYPE_STRUCT, "mrtstats", NULL,
1746: NULL, 0, &?, sizeof(?),
1747: CTL_NET, PF_INET6, IPPROTO_IPV6,
1748: IPV6CTL_MRTSTATS, CTL_EOL);
1.73 atatat 1749: sysctl_createv(clog, 0, NULL, NULL,
1750: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1751: CTLTYPE_?, "mrtproto", NULL,
1752: NULL, 0, &?, sizeof(?),
1753: CTL_NET, PF_INET6, IPPROTO_IPV6,
1754: IPV6CTL_MRTPROTO, CTL_EOL);
1755: #endif
1.73 atatat 1756: sysctl_createv(clog, 0, NULL, NULL,
1757: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1758: CTLTYPE_INT, "maxfragpackets",
1759: SYSCTL_DESCR("Maximum number of fragments to buffer "
1760: "for reassembly"),
1.70 atatat 1761: NULL, 0, &ip6_maxfragpackets, 0,
1762: CTL_NET, PF_INET6, IPPROTO_IPV6,
1763: IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1764: #ifdef __no_idea__
1.73 atatat 1765: sysctl_createv(clog, 0, NULL, NULL,
1766: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1767: CTLTYPE_INT, "sourcecheck", NULL,
1768: NULL, 0, &?, 0,
1769: CTL_NET, PF_INET6, IPPROTO_IPV6,
1770: IPV6CTL_SOURCECHECK, CTL_EOL);
1.73 atatat 1771: sysctl_createv(clog, 0, NULL, NULL,
1772: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1773: CTLTYPE_INT, "sourcecheck_logint", NULL,
1774: NULL, 0, &?, 0,
1775: CTL_NET, PF_INET6, IPPROTO_IPV6,
1776: IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1777: #endif
1.73 atatat 1778: sysctl_createv(clog, 0, NULL, NULL,
1779: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1780: CTLTYPE_INT, "accept_rtadv",
1781: SYSCTL_DESCR("Accept router advertisements"),
1.70 atatat 1782: NULL, 0, &ip6_accept_rtadv, 0,
1783: CTL_NET, PF_INET6, IPPROTO_IPV6,
1784: IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73 atatat 1785: sysctl_createv(clog, 0, NULL, NULL,
1786: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1787: CTLTYPE_INT, "keepfaith",
1788: SYSCTL_DESCR("Activate faith interface"),
1.70 atatat 1789: NULL, 0, &ip6_keepfaith, 0,
1790: CTL_NET, PF_INET6, IPPROTO_IPV6,
1791: IPV6CTL_KEEPFAITH, CTL_EOL);
1.73 atatat 1792: sysctl_createv(clog, 0, NULL, NULL,
1793: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1794: CTLTYPE_INT, "log_interval",
1795: SYSCTL_DESCR("Minumum interval between logging "
1796: "unroutable packets"),
1.70 atatat 1797: NULL, 0, &ip6_log_interval, 0,
1798: CTL_NET, PF_INET6, IPPROTO_IPV6,
1799: IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73 atatat 1800: sysctl_createv(clog, 0, NULL, NULL,
1801: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1802: CTLTYPE_INT, "hdrnestlimit",
1803: SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70 atatat 1804: NULL, 0, &ip6_hdrnestlimit, 0,
1805: CTL_NET, PF_INET6, IPPROTO_IPV6,
1806: IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73 atatat 1807: sysctl_createv(clog, 0, NULL, NULL,
1808: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1809: CTLTYPE_INT, "dad_count",
1810: SYSCTL_DESCR("Number of Duplicate Address Detection "
1811: "probes to send"),
1.70 atatat 1812: NULL, 0, &ip6_dad_count, 0,
1813: CTL_NET, PF_INET6, IPPROTO_IPV6,
1814: IPV6CTL_DAD_COUNT, CTL_EOL);
1.73 atatat 1815: sysctl_createv(clog, 0, NULL, NULL,
1816: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1817: CTLTYPE_INT, "auto_flowlabel",
1818: SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70 atatat 1819: NULL, 0, &ip6_auto_flowlabel, 0,
1820: CTL_NET, PF_INET6, IPPROTO_IPV6,
1821: IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73 atatat 1822: sysctl_createv(clog, 0, NULL, NULL,
1823: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1824: CTLTYPE_INT, "defmcasthlim",
1825: SYSCTL_DESCR("Default multicast hop limit"),
1.70 atatat 1826: NULL, 0, &ip6_defmcasthlim, 0,
1827: CTL_NET, PF_INET6, IPPROTO_IPV6,
1828: IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51 itojun 1829: #if NGIF > 0
1.73 atatat 1830: sysctl_createv(clog, 0, NULL, NULL,
1831: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1832: CTLTYPE_INT, "gifhlim",
1833: SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70 atatat 1834: NULL, 0, &ip6_gif_hlim, 0,
1835: CTL_NET, PF_INET6, IPPROTO_IPV6,
1836: IPV6CTL_GIF_HLIM, CTL_EOL);
1837: #endif /* NGIF */
1.73 atatat 1838: sysctl_createv(clog, 0, NULL, NULL,
1839: CTLFLAG_PERMANENT,
1.74 atatat 1840: CTLTYPE_STRING, "kame_version",
1841: SYSCTL_DESCR("KAME Version"),
1.78 christos 1842: NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70 atatat 1843: CTL_NET, PF_INET6, IPPROTO_IPV6,
1844: IPV6CTL_KAME_VERSION, CTL_EOL);
1.73 atatat 1845: sysctl_createv(clog, 0, NULL, NULL,
1846: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1847: CTLTYPE_INT, "use_deprecated",
1848: SYSCTL_DESCR("Allow use of deprecated addresses as "
1849: "source addresses"),
1.70 atatat 1850: NULL, 0, &ip6_use_deprecated, 0,
1851: CTL_NET, PF_INET6, IPPROTO_IPV6,
1852: IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73 atatat 1853: sysctl_createv(clog, 0, NULL, NULL,
1854: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70 atatat 1855: CTLTYPE_INT, "rr_prune", NULL,
1856: NULL, 0, &ip6_rr_prune, 0,
1857: CTL_NET, PF_INET6, IPPROTO_IPV6,
1858: IPV6CTL_RR_PRUNE, CTL_EOL);
1.73 atatat 1859: sysctl_createv(clog, 0, NULL, NULL,
1860: CTLFLAG_PERMANENT
1.70 atatat 1861: #ifndef INET6_BINDV6ONLY
1.73 atatat 1862: |CTLFLAG_READWRITE,
1.70 atatat 1863: #endif
1.74 atatat 1864: CTLTYPE_INT, "v6only",
1865: SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1866: "to PF_INET sockets"),
1.70 atatat 1867: NULL, 0, &ip6_v6only, 0,
1868: CTL_NET, PF_INET6, IPPROTO_IPV6,
1869: IPV6CTL_V6ONLY, CTL_EOL);
1.73 atatat 1870: sysctl_createv(clog, 0, NULL, NULL,
1871: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1872: CTLTYPE_INT, "anonportmin",
1873: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70 atatat 1874: sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1875: CTL_NET, PF_INET6, IPPROTO_IPV6,
1876: IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73 atatat 1877: sysctl_createv(clog, 0, NULL, NULL,
1878: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1879: CTLTYPE_INT, "anonportmax",
1880: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70 atatat 1881: sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1882: CTL_NET, PF_INET6, IPPROTO_IPV6,
1883: IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26 itojun 1884: #ifndef IPNOPRIVPORTS
1.73 atatat 1885: sysctl_createv(clog, 0, NULL, NULL,
1886: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1887: CTLTYPE_INT, "lowportmin",
1888: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1889: "to assign"),
1.70 atatat 1890: sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1891: CTL_NET, PF_INET6, IPPROTO_IPV6,
1892: IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73 atatat 1893: sysctl_createv(clog, 0, NULL, NULL,
1894: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1895: CTLTYPE_INT, "lowportmax",
1896: SYSCTL_DESCR("Highest privileged ephemeral port number "
1897: "to assign"),
1.70 atatat 1898: sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1899: CTL_NET, PF_INET6, IPPROTO_IPV6,
1900: IPV6CTL_LOWPORTMAX, CTL_EOL);
1901: #endif /* IPNOPRIVPORTS */
1.73 atatat 1902: sysctl_createv(clog, 0, NULL, NULL,
1903: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83 rpaulo 1904: CTLTYPE_INT, "use_tempaddr",
1905: SYSCTL_DESCR("Use temporary address"),
1906: NULL, 0, &ip6_use_tempaddr, 0,
1907: CTL_NET, PF_INET6, IPPROTO_IPV6,
1908: CTL_CREATE, CTL_EOL);
1909: sysctl_createv(clog, 0, NULL, NULL,
1910: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1911: CTLTYPE_INT, "temppltime",
1912: SYSCTL_DESCR("preferred lifetime of a temporary address"),
1913: NULL, 0, &ip6_temp_preferred_lifetime, 0,
1914: CTL_NET, PF_INET6, IPPROTO_IPV6,
1915: CTL_CREATE, CTL_EOL);
1916: sysctl_createv(clog, 0, NULL, NULL,
1917: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1918: CTLTYPE_INT, "tempvltime",
1919: SYSCTL_DESCR("valid lifetime of a temporary address"),
1920: NULL, 0, &ip6_temp_valid_lifetime, 0,
1921: CTL_NET, PF_INET6, IPPROTO_IPV6,
1922: CTL_CREATE, CTL_EOL);
1923: sysctl_createv(clog, 0, NULL, NULL,
1924: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74 atatat 1925: CTLTYPE_INT, "maxfrags",
1926: SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70 atatat 1927: NULL, 0, &ip6_maxfrags, 0,
1928: CTL_NET, PF_INET6, IPPROTO_IPV6,
1929: IPV6CTL_MAXFRAGS, CTL_EOL);
1.79 rpaulo 1930: sysctl_createv(clog, 0, NULL, NULL,
1931: CTLFLAG_PERMANENT,
1932: CTLTYPE_STRUCT, "stats",
1933: SYSCTL_DESCR("IPv6 statistics"),
1.116 ! thorpej 1934: sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79 rpaulo 1935: CTL_NET, PF_INET6, IPPROTO_IPV6,
1936: IPV6CTL_STATS, CTL_EOL);
1.81 rpaulo 1937: sysctl_createv(clog, 0, NULL, NULL,
1938: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1939: CTLTYPE_INT, "use_defaultzone",
1940: SYSCTL_DESCR("Whether to use the default scope zones"),
1941: NULL, 0, &ip6_use_defzone, 0,
1942: CTL_NET, PF_INET6, IPPROTO_IPV6,
1943: IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83 rpaulo 1944: sysctl_createv(clog, 0, NULL, NULL,
1945: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1946: CTLTYPE_INT, "mcast_pmtu",
1947: SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1948: NULL, 0, &ip6_mcast_pmtu, 0,
1949: CTL_NET, PF_INET6, IPPROTO_IPV6,
1950: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1951: #ifdef GATEWAY
1952: sysctl_createv(clog, 0, NULL, NULL,
1953: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1954: CTLTYPE_INT, "maxflows",
1955: SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101 liamjfoy 1956: sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98 liamjfoy 1957: CTL_NET, PF_INET6, IPPROTO_IPV6,
1958: CTL_CREATE, CTL_EOL);
1.99 liamjfoy 1959: sysctl_createv(clog, 0, NULL, NULL,
1960: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1961: CTLTYPE_INT, "hashsize",
1962: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1963: sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1964: CTL_NET, PF_INET6, IPPROTO_IPV6,
1965: CTL_CREATE, CTL_EOL);
1.98 liamjfoy 1966: #endif
1.2 itojun 1967: }
1.116 ! thorpej 1968:
! 1969: void
! 1970: ip6_statinc(u_int stat)
! 1971: {
! 1972:
! 1973: KASSERT(stat < IP6_NSTATS);
! 1974: IP6_STATINC(stat);
! 1975: }
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