Annotation of src/sys/netinet6/ip6_input.c, Revision 1.52.2.1
1.52.2.1! gehenna 1: /* $NetBSD: ip6_input.c,v 1.54 2002/05/28 10:11:51 itojun 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.
45: * 3. All advertising materials mentioning features or use of this software
46: * must display the following acknowledgement:
47: * This product includes software developed by the University of
48: * California, Berkeley and its contributors.
49: * 4. Neither the name of the University nor the names of its contributors
50: * may be used to endorse or promote products derived from this software
51: * without specific prior written permission.
52: *
53: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: * SUCH DAMAGE.
64: *
65: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
66: */
1.48 lukem 67:
68: #include <sys/cdefs.h>
1.52.2.1! gehenna 69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.54 2002/05/28 10:11:51 itojun Exp $");
1.2 itojun 70:
71: #include "opt_inet.h"
1.4 thorpej 72: #include "opt_ipsec.h"
1.15 darrenr 73: #include "opt_pfil_hooks.h"
1.2 itojun 74:
75: #include <sys/param.h>
76: #include <sys/systm.h>
77: #include <sys/malloc.h>
78: #include <sys/mbuf.h>
79: #include <sys/domain.h>
80: #include <sys/protosw.h>
81: #include <sys/socket.h>
82: #include <sys/socketvar.h>
83: #include <sys/errno.h>
84: #include <sys/time.h>
85: #include <sys/kernel.h>
86: #include <sys/syslog.h>
87: #include <sys/proc.h>
1.46 simonb 88: #include <sys/sysctl.h>
1.2 itojun 89:
90: #include <net/if.h>
91: #include <net/if_types.h>
92: #include <net/if_dl.h>
93: #include <net/route.h>
94: #include <net/netisr.h>
1.15 darrenr 95: #ifdef PFIL_HOOKS
96: #include <net/pfil.h>
97: #endif
1.2 itojun 98:
99: #include <netinet/in.h>
1.9 itojun 100: #include <netinet/in_systm.h>
101: #ifdef INET
102: #include <netinet/ip.h>
103: #include <netinet/ip_icmp.h>
1.45 itojun 104: #endif /* INET */
1.14 itojun 105: #include <netinet/ip6.h>
1.2 itojun 106: #include <netinet6/in6_var.h>
1.11 itojun 107: #include <netinet6/ip6_var.h>
1.2 itojun 108: #include <netinet6/in6_pcb.h>
1.14 itojun 109: #include <netinet/icmp6.h>
1.2 itojun 110: #include <netinet6/in6_ifattach.h>
111: #include <netinet6/nd6.h>
1.9 itojun 112: #include <netinet6/in6_prefix.h>
1.2 itojun 113:
1.37 itojun 114: #ifdef IPSEC
115: #include <netinet6/ipsec.h>
116: #endif
117:
1.2 itojun 118: #include <netinet6/ip6protosw.h>
119:
120: /* we need it for NLOOP. */
121: #include "loop.h"
122: #include "faith.h"
123: #include "gif.h"
124: #include "bpfilter.h"
1.50 itojun 125:
126: #if NGIF > 0
127: #include <netinet6/in6_gif.h>
128: #endif
1.2 itojun 129:
1.9 itojun 130: #include <net/net_osdep.h>
131:
1.2 itojun 132: extern struct domain inet6domain;
133:
134: u_char ip6_protox[IPPROTO_MAX];
135: static int ip6qmaxlen = IFQ_MAXLEN;
136: struct in6_ifaddr *in6_ifaddr;
137: struct ifqueue ip6intrq;
138:
139: extern struct ifnet loif[NLOOP];
140: int ip6_forward_srcrt; /* XXX */
141: int ip6_sourcecheck; /* XXX */
142: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 143:
1.29 thorpej 144: #ifdef PFIL_HOOKS
145: struct pfil_head inet6_pfil_hook;
146: #endif
147:
1.2 itojun 148: struct ip6stat ip6stat;
149:
150: static void ip6_init2 __P((void *));
151:
1.5 itojun 152: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 153:
154: /*
155: * IP6 initialization: fill in IP6 protocol switch table.
156: * All protocols not implemented in kernel go to raw IP6 protocol handler.
157: */
158: void
159: ip6_init()
160: {
1.35 itojun 161: struct ip6protosw *pr;
162: int i;
1.2 itojun 163:
164: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
165: if (pr == 0)
166: panic("ip6_init");
167: for (i = 0; i < IPPROTO_MAX; i++)
168: ip6_protox[i] = pr - inet6sw;
169: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
170: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
171: if (pr->pr_domain->dom_family == PF_INET6 &&
172: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
173: ip6_protox[pr->pr_protocol] = pr - inet6sw;
174: ip6intrq.ifq_maxlen = ip6qmaxlen;
175: nd6_init();
176: frag6_init();
1.52.2.1! gehenna 177: ip6_flow_seq = arc4random();
1.2 itojun 178:
179: ip6_init2((void *)0);
1.29 thorpej 180:
181: #ifdef PFIL_HOOKS
182: /* Register our Packet Filter hook. */
1.33 thorpej 183: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
184: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 185: i = pfil_head_register(&inet6_pfil_hook);
186: if (i != 0)
187: printf("ip6_init: WARNING: unable to register pfil hook, "
188: "error %d\n", i);
189: #endif /* PFIL_HOOKS */
1.2 itojun 190: }
191:
192: static void
193: ip6_init2(dummy)
194: void *dummy;
195: {
196: /*
197: * to route local address of p2p link to loopback,
1.21 itojun 198: * assign loopback address first.
1.2 itojun 199: */
1.20 itojun 200: in6_ifattach(&loif[0], NULL);
1.2 itojun 201:
202: /* nd6_timer_init */
1.19 thorpej 203: callout_init(&nd6_timer_ch);
204: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 205: /* router renumbering prefix list maintenance */
1.19 thorpej 206: callout_init(&in6_rr_timer_ch);
207: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 208: }
209:
210: /*
211: * IP6 input interrupt handling. Just pass the packet to ip6_input.
212: */
213: void
214: ip6intr()
215: {
216: int s;
217: struct mbuf *m;
218:
219: for (;;) {
1.41 thorpej 220: s = splnet();
1.2 itojun 221: IF_DEQUEUE(&ip6intrq, m);
222: splx(s);
223: if (m == 0)
224: return;
225: ip6_input(m);
226: }
227: }
228:
229: extern struct route_in6 ip6_forward_rt;
230:
231: void
232: ip6_input(m)
233: struct mbuf *m;
234: {
1.9 itojun 235: struct ip6_hdr *ip6;
1.2 itojun 236: int off = sizeof(struct ip6_hdr), nest;
237: u_int32_t plen;
1.5 itojun 238: u_int32_t rtalert = ~0;
1.2 itojun 239: int nxt, ours = 0;
1.9 itojun 240: struct ifnet *deliverifp = NULL;
1.2 itojun 241:
242: #ifdef IPSEC
243: /*
244: * should the inner packet be considered authentic?
245: * see comment in ah4_input().
246: */
1.49 itojun 247: m->m_flags &= ~M_AUTHIPHDR;
248: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 249: #endif
1.9 itojun 250:
1.2 itojun 251: /*
1.44 itojun 252: * mbuf statistics
1.2 itojun 253: */
254: if (m->m_flags & M_EXT) {
255: if (m->m_next)
256: ip6stat.ip6s_mext2m++;
257: else
258: ip6stat.ip6s_mext1++;
259: } else {
1.40 itojun 260: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 261: if (m->m_next) {
1.9 itojun 262: if (m->m_flags & M_LOOP) {
1.44 itojun 263: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 264: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 265: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
266: else
267: ip6stat.ip6s_m2m[0]++;
268: } else
269: ip6stat.ip6s_m1++;
1.40 itojun 270: #undef M2MMAX
1.2 itojun 271: }
272:
1.9 itojun 273: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
274: ip6stat.ip6s_total++;
275:
276: #ifndef PULLDOWN_TEST
277: /* XXX is the line really necessary? */
1.2 itojun 278: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 279: #endif
1.2 itojun 280:
1.9 itojun 281: if (m->m_len < sizeof(struct ip6_hdr)) {
282: struct ifnet *inifp;
283: inifp = m->m_pkthdr.rcvif;
284: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
285: ip6stat.ip6s_toosmall++;
286: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
287: return;
288: }
1.2 itojun 289: }
290:
291: ip6 = mtod(m, struct ip6_hdr *);
292:
293: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
294: ip6stat.ip6s_badvers++;
1.9 itojun 295: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 296: goto bad;
297: }
1.15 darrenr 298:
299: #ifdef PFIL_HOOKS
300: /*
301: * Run through list of hooks for input packets. If there are any
302: * filters which require that additional packets in the flow are
303: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
304: * Note that filters must _never_ set this flag, as another filter
305: * in the list may have previously cleared it.
306: */
1.39 itojun 307: /*
308: * let ipfilter look at packet on the wire,
309: * not the decapsulated packet.
310: */
311: #ifdef IPSEC
1.42 itojun 312: if (!ipsec_getnhist(m))
1.39 itojun 313: #else
314: if (1)
315: #endif
316: {
317: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
318: PFIL_IN) != 0)
319: return;
320: if (m == NULL)
321: return;
322: ip6 = mtod(m, struct ip6_hdr *);
323: }
1.15 darrenr 324: #endif /* PFIL_HOOKS */
325:
1.2 itojun 326: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
327:
1.30 thorpej 328: #ifdef ALTQ
329: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
330: /* packet is dropped by traffic conditioner */
331: return;
1.9 itojun 332: }
333: #endif
334:
1.2 itojun 335: /*
1.44 itojun 336: * Check against address spoofing/corruption.
1.2 itojun 337: */
338: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
339: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
340: ip6stat.ip6s_badscope++;
1.9 itojun 341: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 342: goto bad;
343: }
1.13 itojun 344: /*
1.44 itojun 345: * The following check is not documented in specs. A malicious
346: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
347: * and bypass security checks (act as if it was from 127.0.0.1 by using
348: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 349: *
1.44 itojun 350: * This check chokes if we are in an SIIT cloud. As none of BSDs
351: * support IPv4-less kernel compilation, we cannot support SIIT
352: * environment at all. So, it makes more sense for us to reject any
353: * malicious packets for non-SIIT environment, than try to do a
1.52 wiz 354: * partial support for SIIT environment.
1.13 itojun 355: */
356: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
357: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
358: ip6stat.ip6s_badscope++;
359: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
360: goto bad;
361: }
1.17 itojun 362: #if 0
1.13 itojun 363: /*
1.17 itojun 364: * Reject packets with IPv4 compatible addresses (auto tunnel).
365: *
366: * The code forbids auto tunnel relay case in RFC1933 (the check is
367: * stronger than RFC1933). We may want to re-enable it if mech-xx
368: * is revised to forbid relaying case.
1.13 itojun 369: */
370: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
371: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
372: ip6stat.ip6s_badscope++;
373: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
374: goto bad;
375: }
376: #endif
1.35 itojun 377:
1.2 itojun 378: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
379: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
380: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
381: ours = 1;
1.9 itojun 382: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 383: goto hbhcheck;
384: } else {
385: ip6stat.ip6s_badscope++;
1.9 itojun 386: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 387: goto bad;
388: }
389: }
390:
1.38 itojun 391: /* drop packets if interface ID portion is already filled */
392: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
393: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
394: ip6->ip6_src.s6_addr16[1]) {
395: ip6stat.ip6s_badscope++;
396: goto bad;
397: }
398: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
399: ip6->ip6_dst.s6_addr16[1]) {
400: ip6stat.ip6s_badscope++;
401: goto bad;
402: }
403: }
1.2 itojun 404:
1.40 itojun 405: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
406: ip6->ip6_src.s6_addr16[1]
407: = htons(m->m_pkthdr.rcvif->if_index);
408: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
409: ip6->ip6_dst.s6_addr16[1]
410: = htons(m->m_pkthdr.rcvif->if_index);
411:
412: /*
413: * We use rt->rt_ifp to determine if the address is ours or not.
414: * If rt_ifp is lo0, the address is ours.
415: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
416: * so any address under fe80::%lo0/64 will be mistakenly considered
417: * local. The special case is supplied to handle the case properly
418: * by actually looking at interface addresses
419: * (using in6ifa_ifpwithaddr).
420: */
421: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
422: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
423: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
424: icmp6_error(m, ICMP6_DST_UNREACH,
425: ICMP6_DST_UNREACH_ADDR, 0);
426: /* m is already freed */
427: return;
1.21 itojun 428: }
1.40 itojun 429:
430: ours = 1;
431: deliverifp = m->m_pkthdr.rcvif;
432: goto hbhcheck;
1.9 itojun 433: }
434:
1.2 itojun 435: /*
436: * Multicast check
437: */
438: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
439: struct in6_multi *in6m = 0;
1.9 itojun 440:
441: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 442: /*
443: * See if we belong to the destination multicast group on the
444: * arrival interface.
445: */
446: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
447: if (in6m)
448: ours = 1;
449: else if (!ip6_mrouter) {
450: ip6stat.ip6s_notmember++;
451: ip6stat.ip6s_cantforward++;
1.9 itojun 452: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 453: goto bad;
454: }
1.9 itojun 455: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 456: goto hbhcheck;
457: }
458:
459: /*
460: * Unicast check
461: */
1.22 itojun 462: if (ip6_forward_rt.ro_rt != NULL &&
463: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
464: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 465: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 466: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 467: else {
1.35 itojun 468: struct sockaddr_in6 *dst6;
469:
1.2 itojun 470: if (ip6_forward_rt.ro_rt) {
1.22 itojun 471: /* route is down or destination is different */
1.25 itojun 472: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 473: RTFREE(ip6_forward_rt.ro_rt);
474: ip6_forward_rt.ro_rt = 0;
475: }
1.22 itojun 476:
1.2 itojun 477: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 478: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
479: dst6->sin6_len = sizeof(struct sockaddr_in6);
480: dst6->sin6_family = AF_INET6;
481: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 482:
1.9 itojun 483: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 484: }
485:
486: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
487:
488: /*
489: * Accept the packet if the forwarding interface to the destination
490: * according to the routing table is the loopback interface,
491: * unless the associated route has a gateway.
492: * Note that this approach causes to accept a packet if there is a
493: * route to the loopback interface for the destination of the packet.
494: * But we think it's even useful in some situations, e.g. when using
495: * a special daemon which wants to intercept the packet.
496: */
497: if (ip6_forward_rt.ro_rt &&
498: (ip6_forward_rt.ro_rt->rt_flags &
499: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
500: #if 0
501: /*
502: * The check below is redundant since the comparison of
503: * the destination and the key of the rtentry has
504: * already done through looking up the routing table.
505: */
506: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
507: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
508: #endif
1.9 itojun 509: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 510: struct in6_ifaddr *ia6 =
511: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
512: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
513: m->m_flags |= M_ANYCAST6;
1.24 itojun 514: /*
515: * packets to a tentative, duplicated, or somehow invalid
516: * address must not be accepted.
517: */
1.2 itojun 518: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 519: /* this address is ready */
1.2 itojun 520: ours = 1;
1.9 itojun 521: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 522: goto hbhcheck;
523: } else {
1.24 itojun 524: /* address is not ready, so discard the packet. */
1.34 itojun 525: nd6log((LOG_INFO,
1.27 itojun 526: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 527: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 528: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 529:
530: goto bad;
1.2 itojun 531: }
532: }
533:
534: /*
535: * FAITH(Firewall Aided Internet Translator)
536: */
537: #if defined(NFAITH) && 0 < NFAITH
538: if (ip6_keepfaith) {
539: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
540: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
541: /* XXX do we need more sanity checks? */
542: ours = 1;
1.45 itojun 543: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 544: goto hbhcheck;
545: }
546: }
547: #endif
548:
549: #if 0
550: {
551: /*
552: * Last resort: check in6_ifaddr for incoming interface.
553: * The code is here until I update the "goto ours hack" code above
554: * working right.
555: */
556: struct ifaddr *ifa;
557: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
558: ifa;
559: ifa = ifa->ifa_list.tqe_next) {
560: if (ifa->ifa_addr == NULL)
561: continue; /* just for safety */
562: if (ifa->ifa_addr->sa_family != AF_INET6)
563: continue;
564: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
565: ours = 1;
566: deliverifp = ifa->ifa_ifp;
1.2 itojun 567: goto hbhcheck;
568: }
569: }
1.9 itojun 570: }
1.2 itojun 571: #endif
572:
573: /*
574: * Now there is no reason to process the packet if it's not our own
575: * and we're not a router.
576: */
577: if (!ip6_forwarding) {
578: ip6stat.ip6s_cantforward++;
1.9 itojun 579: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 580: goto bad;
581: }
582:
583: hbhcheck:
584: /*
585: * Process Hop-by-Hop options header if it's contained.
586: * m may be modified in ip6_hopopts_input().
587: * If a JumboPayload option is included, plen will also be modified.
588: */
589: plen = (u_int32_t)ntohs(ip6->ip6_plen);
590: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 591: struct ip6_hbh *hbh;
592:
593: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
594: #if 0 /*touches NULL pointer*/
595: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
596: #endif
1.2 itojun 597: return; /* m have already been freed */
1.9 itojun 598: }
1.22 itojun 599:
1.2 itojun 600: /* adjust pointer */
601: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 602:
603: /*
1.49 itojun 604: * if the payload length field is 0 and the next header field
1.22 itojun 605: * indicates Hop-by-Hop Options header, then a Jumbo Payload
606: * option MUST be included.
607: */
608: if (ip6->ip6_plen == 0 && plen == 0) {
609: /*
610: * Note that if a valid jumbo payload option is
611: * contained, ip6_hoptops_input() must set a valid
612: * (non-zero) payload length to the variable plen.
613: */
614: ip6stat.ip6s_badoptions++;
615: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
616: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
617: icmp6_error(m, ICMP6_PARAM_PROB,
618: ICMP6_PARAMPROB_HEADER,
619: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
620: return;
621: }
1.9 itojun 622: #ifndef PULLDOWN_TEST
623: /* ip6_hopopts_input() ensures that mbuf is contiguous */
624: hbh = (struct ip6_hbh *)(ip6 + 1);
625: #else
626: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
627: sizeof(struct ip6_hbh));
628: if (hbh == NULL) {
629: ip6stat.ip6s_tooshort++;
630: return;
631: }
632: #endif
633: nxt = hbh->ip6h_nxt;
1.2 itojun 634:
635: /*
636: * accept the packet if a router alert option is included
637: * and we act as an IPv6 router.
638: */
1.5 itojun 639: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 640: ours = 1;
641: } else
642: nxt = ip6->ip6_nxt;
643:
644: /*
645: * Check that the amount of data in the buffers
646: * is as at least much as the IPv6 header would have us expect.
647: * Trim mbufs if longer than we expect.
648: * Drop packet if shorter than we expect.
649: */
650: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
651: ip6stat.ip6s_tooshort++;
1.9 itojun 652: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 653: goto bad;
654: }
655: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
656: if (m->m_len == m->m_pkthdr.len) {
657: m->m_len = sizeof(struct ip6_hdr) + plen;
658: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
659: } else
660: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
661: }
662:
663: /*
664: * Forward if desirable.
665: */
666: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
667: /*
668: * If we are acting as a multicast router, all
669: * incoming multicast packets are passed to the
670: * kernel-level multicast forwarding function.
671: * The packet is returned (relatively) intact; if
672: * ip6_mforward() returns a non-zero value, the packet
673: * must be discarded, else it may be accepted below.
674: */
675: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
676: ip6stat.ip6s_cantforward++;
677: m_freem(m);
678: return;
679: }
680: if (!ours) {
681: m_freem(m);
682: return;
683: }
1.22 itojun 684: } else if (!ours) {
1.2 itojun 685: ip6_forward(m, 0);
686: return;
687: }
1.25 itojun 688:
689: ip6 = mtod(m, struct ip6_hdr *);
690:
691: /*
692: * Malicious party may be able to use IPv4 mapped addr to confuse
693: * tcp/udp stack and bypass security checks (act as if it was from
694: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
695: *
696: * For SIIT end node behavior, you may want to disable the check.
697: * However, you will become vulnerable to attacks using IPv4 mapped
698: * source.
699: */
700: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
701: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
702: ip6stat.ip6s_badscope++;
703: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
704: goto bad;
705: }
1.2 itojun 706:
707: /*
708: * Tell launch routine the next header
709: */
1.12 itojun 710: #ifdef IFA_STATS
1.28 itojun 711: if (deliverifp != NULL) {
1.9 itojun 712: struct in6_ifaddr *ia6;
713: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
714: if (ia6)
715: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
716: }
717: #endif
1.2 itojun 718: ip6stat.ip6s_delivered++;
1.9 itojun 719: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 720: nest = 0;
1.40 itojun 721:
1.2 itojun 722: while (nxt != IPPROTO_DONE) {
723: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
724: ip6stat.ip6s_toomanyhdr++;
725: goto bad;
726: }
1.8 itojun 727:
728: /*
729: * protection against faulty packet - there should be
730: * more sanity checks in header chain processing.
731: */
732: if (m->m_pkthdr.len < off) {
733: ip6stat.ip6s_tooshort++;
1.9 itojun 734: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 735: goto bad;
736: }
737:
1.37 itojun 738: #ifdef IPSEC
739: /*
740: * enforce IPsec policy checking if we are seeing last header.
741: * note that we do not visit this with protocols with pcb layer
742: * code - like udp/tcp/raw ip.
743: */
744: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
745: ipsec6_in_reject(m, NULL)) {
746: ipsec6stat.in_polvio++;
747: goto bad;
748: }
749: #endif
750:
1.2 itojun 751: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
752: }
753: return;
754: bad:
755: m_freem(m);
756: }
757:
758: /*
759: * Hop-by-Hop options header processing. If a valid jumbo payload option is
760: * included, the real payload length will be stored in plenp.
761: */
762: static int
763: ip6_hopopts_input(plenp, rtalertp, mp, offp)
764: u_int32_t *plenp;
1.5 itojun 765: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 766: struct mbuf **mp;
767: int *offp;
768: {
1.35 itojun 769: struct mbuf *m = *mp;
1.2 itojun 770: int off = *offp, hbhlen;
771: struct ip6_hbh *hbh;
772: u_int8_t *opt;
773:
774: /* validation of the length of the header */
1.9 itojun 775: #ifndef PULLDOWN_TEST
1.2 itojun 776: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
777: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
778: hbhlen = (hbh->ip6h_len + 1) << 3;
779:
780: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
781: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 782: #else
783: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
784: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
785: if (hbh == NULL) {
786: ip6stat.ip6s_tooshort++;
787: return -1;
788: }
789: hbhlen = (hbh->ip6h_len + 1) << 3;
790: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
791: hbhlen);
792: if (hbh == NULL) {
793: ip6stat.ip6s_tooshort++;
794: return -1;
795: }
796: #endif
1.2 itojun 797: off += hbhlen;
798: hbhlen -= sizeof(struct ip6_hbh);
799: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
800:
801: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
802: hbhlen, rtalertp, plenp) < 0)
803: return(-1);
804:
805: *offp = off;
806: *mp = m;
807: return(0);
808: }
809:
810: /*
811: * Search header for all Hop-by-hop options and process each option.
812: * This function is separate from ip6_hopopts_input() in order to
813: * handle a case where the sending node itself process its hop-by-hop
814: * options header. In such a case, the function is called from ip6_output().
815: */
816: int
817: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
818: struct mbuf *m;
819: u_int8_t *opthead;
820: int hbhlen;
1.5 itojun 821: u_int32_t *rtalertp;
1.2 itojun 822: u_int32_t *plenp;
823: {
824: struct ip6_hdr *ip6;
825: int optlen = 0;
826: u_int8_t *opt = opthead;
827: u_int16_t rtalert_val;
1.22 itojun 828: u_int32_t jumboplen;
1.2 itojun 829:
830: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 831: switch (*opt) {
832: case IP6OPT_PAD1:
833: optlen = 1;
834: break;
835: case IP6OPT_PADN:
836: if (hbhlen < IP6OPT_MINLEN) {
837: ip6stat.ip6s_toosmall++;
838: goto bad;
839: }
840: optlen = *(opt + 1) + 2;
841: break;
842: case IP6OPT_RTALERT:
843: /* XXX may need check for alignment */
844: if (hbhlen < IP6OPT_RTALERT_LEN) {
845: ip6stat.ip6s_toosmall++;
846: goto bad;
847: }
848: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
849: /* XXX: should we discard the packet? */
850: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
851: *(opt + 1));
852: }
853: optlen = IP6OPT_RTALERT_LEN;
854: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
855: *rtalertp = ntohs(rtalert_val);
856: break;
857: case IP6OPT_JUMBO:
1.22 itojun 858: /* XXX may need check for alignment */
859: if (hbhlen < IP6OPT_JUMBO_LEN) {
860: ip6stat.ip6s_toosmall++;
861: goto bad;
862: }
1.35 itojun 863: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
864: /* XXX: should we discard the packet? */
1.22 itojun 865: log(LOG_ERR, "length of jumbopayload opt "
1.27 itojun 866: "is inconsistent(%d)\n",
1.22 itojun 867: *(opt + 1));
1.35 itojun 868: }
1.22 itojun 869: optlen = IP6OPT_JUMBO_LEN;
870:
871: /*
872: * IPv6 packets that have non 0 payload length
1.35 itojun 873: * must not contain a jumbo payload option.
1.22 itojun 874: */
875: ip6 = mtod(m, struct ip6_hdr *);
876: if (ip6->ip6_plen) {
877: ip6stat.ip6s_badoptions++;
878: icmp6_error(m, ICMP6_PARAM_PROB,
879: ICMP6_PARAMPROB_HEADER,
880: sizeof(struct ip6_hdr) +
881: sizeof(struct ip6_hbh) +
882: opt - opthead);
883: return(-1);
884: }
1.2 itojun 885:
1.22 itojun 886: /*
887: * We may see jumbolen in unaligned location, so
888: * we'd need to perform bcopy().
889: */
890: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
891: jumboplen = (u_int32_t)htonl(jumboplen);
892:
893: #if 1
894: /*
895: * if there are multiple jumbo payload options,
896: * *plenp will be non-zero and the packet will be
897: * rejected.
898: * the behavior may need some debate in ipngwg -
899: * multiple options does not make sense, however,
900: * there's no explicit mention in specification.
901: */
902: if (*plenp != 0) {
903: ip6stat.ip6s_badoptions++;
904: icmp6_error(m, ICMP6_PARAM_PROB,
905: ICMP6_PARAMPROB_HEADER,
906: sizeof(struct ip6_hdr) +
907: sizeof(struct ip6_hbh) +
908: opt + 2 - opthead);
909: return(-1);
910: }
1.8 itojun 911: #endif
1.2 itojun 912:
1.22 itojun 913: /*
914: * jumbo payload length must be larger than 65535.
915: */
916: if (jumboplen <= IPV6_MAXPACKET) {
917: ip6stat.ip6s_badoptions++;
918: icmp6_error(m, ICMP6_PARAM_PROB,
919: ICMP6_PARAMPROB_HEADER,
920: sizeof(struct ip6_hdr) +
921: sizeof(struct ip6_hbh) +
922: opt + 2 - opthead);
923: return(-1);
924: }
925: *plenp = jumboplen;
926:
927: break;
1.35 itojun 928: default: /* unknown option */
929: if (hbhlen < IP6OPT_MINLEN) {
930: ip6stat.ip6s_toosmall++;
931: goto bad;
932: }
933: if ((optlen = ip6_unknown_opt(opt, m,
934: sizeof(struct ip6_hdr) +
935: sizeof(struct ip6_hbh) +
936: opt - opthead)) == -1)
937: return(-1);
938: optlen += 2;
939: break;
1.2 itojun 940: }
941: }
942:
943: return(0);
944:
945: bad:
946: m_freem(m);
947: return(-1);
948: }
949:
950: /*
951: * Unknown option processing.
952: * The third argument `off' is the offset from the IPv6 header to the option,
953: * which is necessary if the IPv6 header the and option header and IPv6 header
954: * is not continuous in order to return an ICMPv6 error.
955: */
956: int
957: ip6_unknown_opt(optp, m, off)
958: u_int8_t *optp;
959: struct mbuf *m;
960: int off;
961: {
962: struct ip6_hdr *ip6;
963:
1.35 itojun 964: switch (IP6OPT_TYPE(*optp)) {
965: case IP6OPT_TYPE_SKIP: /* ignore the option */
966: return((int)*(optp + 1));
967: case IP6OPT_TYPE_DISCARD: /* silently discard */
968: m_freem(m);
969: return(-1);
970: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
971: ip6stat.ip6s_badoptions++;
972: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
973: return(-1);
974: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
975: ip6stat.ip6s_badoptions++;
976: ip6 = mtod(m, struct ip6_hdr *);
977: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
978: (m->m_flags & (M_BCAST|M_MCAST)))
979: m_freem(m);
980: else
981: icmp6_error(m, ICMP6_PARAM_PROB,
982: ICMP6_PARAMPROB_OPTION, off);
983: return(-1);
1.2 itojun 984: }
985:
986: m_freem(m); /* XXX: NOTREACHED */
987: return(-1);
988: }
989:
990: /*
1.9 itojun 991: * Create the "control" list for this pcb.
992: *
993: * The routine will be called from upper layer handlers like tcp6_input().
994: * Thus the routine assumes that the caller (tcp6_input) have already
995: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
996: * very first mbuf on the mbuf chain.
997: * We may want to add some infinite loop prevention or sanity checks for safety.
998: * (This applies only when you are using KAME mbuf chain restriction, i.e.
999: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1000: */
1001: void
1002: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 1003: struct in6pcb *in6p;
1004: struct mbuf **mp;
1005: struct ip6_hdr *ip6;
1006: struct mbuf *m;
1.2 itojun 1007: {
1008: struct proc *p = curproc; /* XXX */
1.9 itojun 1009: int privileged;
1.2 itojun 1010:
1.9 itojun 1011: privileged = 0;
1012: if (p && !suser(p->p_ucred, &p->p_acflag))
1013: privileged++;
1014:
1015: #ifdef SO_TIMESTAMP
1.2 itojun 1016: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1017: struct timeval tv;
1018:
1019: microtime(&tv);
1020: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1021: SCM_TIMESTAMP, SOL_SOCKET);
1022: if (*mp)
1023: mp = &(*mp)->m_next;
1024: }
1.9 itojun 1025: #endif
1.2 itojun 1026: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1027: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1028: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1029: IPPROTO_IPV6);
1030: if (*mp)
1031: mp = &(*mp)->m_next;
1032: }
1033:
1034: #ifdef noyet
1035: /* options were tossed above */
1036: if (in6p->in6p_flags & IN6P_RECVOPTS)
1037: /* broken */
1038: /* ip6_srcroute doesn't do what we want here, need to fix */
1039: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1040: /* broken */
1041: #endif
1042:
1043: /* RFC 2292 sec. 5 */
1.35 itojun 1044: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1045: struct in6_pktinfo pi6;
1046: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1047: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1048: pi6.ipi6_addr.s6_addr16[1] = 0;
1049: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1050: ? m->m_pkthdr.rcvif->if_index
1051: : 0;
1052: *mp = sbcreatecontrol((caddr_t) &pi6,
1053: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1054: IPPROTO_IPV6);
1055: if (*mp)
1056: mp = &(*mp)->m_next;
1057: }
1058: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1059: int hlim = ip6->ip6_hlim & 0xff;
1060: *mp = sbcreatecontrol((caddr_t) &hlim,
1061: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1062: if (*mp)
1063: mp = &(*mp)->m_next;
1064: }
1065: /* IN6P_NEXTHOP - for outgoing packet only */
1066:
1067: /*
1068: * IPV6_HOPOPTS socket option. We require super-user privilege
1069: * for the option, but it might be too strict, since there might
1070: * be some hop-by-hop options which can be returned to normal user.
1071: * See RFC 2292 section 6.
1072: */
1.35 itojun 1073: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1074: /*
1075: * Check if a hop-by-hop options header is contatined in the
1076: * received packet, and if so, store the options as ancillary
1077: * data. Note that a hop-by-hop options header must be
1078: * just after the IPv6 header, which fact is assured through
1079: * the IPv6 input processing.
1080: */
1081: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1082: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1083: struct ip6_hbh *hbh;
1084: int hbhlen;
1085:
1086: #ifndef PULLDOWN_TEST
1087: hbh = (struct ip6_hbh *)(ip6 + 1);
1088: hbhlen = (hbh->ip6h_len + 1) << 3;
1089: #else
1090: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1091: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1092: if (hbh == NULL) {
1093: ip6stat.ip6s_tooshort++;
1094: return;
1095: }
1096: hbhlen = (hbh->ip6h_len + 1) << 3;
1097: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1098: sizeof(struct ip6_hdr), hbhlen);
1099: if (hbh == NULL) {
1100: ip6stat.ip6s_tooshort++;
1101: return;
1102: }
1103: #endif
1.2 itojun 1104:
1105: /*
1106: * XXX: We copy whole the header even if a jumbo
1107: * payload option is included, which option is to
1108: * be removed before returning in the RFC 2292.
1109: * But it's too painful operation...
1110: */
1.9 itojun 1111: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1112: IPV6_HOPOPTS, IPPROTO_IPV6);
1113: if (*mp)
1114: mp = &(*mp)->m_next;
1115: }
1116: }
1117:
1118: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1119: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1120: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1121: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1122:
1123: /*
1124: * Search for destination options headers or routing
1125: * header(s) through the header chain, and stores each
1126: * header as ancillary data.
1127: * Note that the order of the headers remains in
1128: * the chain of ancillary data.
1129: */
1.35 itojun 1130: while (1) { /* is explicit loop prevention necessary? */
1.9 itojun 1131: struct ip6_ext *ip6e;
1132: int elen;
1133:
1134: #ifndef PULLDOWN_TEST
1135: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1136: if (nxt == IPPROTO_AH)
1137: elen = (ip6e->ip6e_len + 2) << 2;
1138: else
1139: elen = (ip6e->ip6e_len + 1) << 3;
1140: #else
1141: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1142: sizeof(struct ip6_ext));
1143: if (ip6e == NULL) {
1144: ip6stat.ip6s_tooshort++;
1145: return;
1146: }
1147: if (nxt == IPPROTO_AH)
1148: elen = (ip6e->ip6e_len + 2) << 2;
1149: else
1150: elen = (ip6e->ip6e_len + 1) << 3;
1151: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1152: if (ip6e == NULL) {
1153: ip6stat.ip6s_tooshort++;
1154: return;
1155: }
1156: #endif
1.2 itojun 1157:
1.35 itojun 1158: switch (nxt) {
1159: case IPPROTO_DSTOPTS:
1160: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1161: break;
1162:
1163: /*
1164: * We also require super-user privilege for
1165: * the option.
1166: * See the comments on IN6_HOPOPTS.
1167: */
1168: if (!privileged)
1169: break;
1170:
1171: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1172: IPV6_DSTOPTS,
1173: IPPROTO_IPV6);
1174: if (*mp)
1175: mp = &(*mp)->m_next;
1176: break;
1177:
1178: case IPPROTO_ROUTING:
1179: if (!in6p->in6p_flags & IN6P_RTHDR)
1180: break;
1181:
1182: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1183: IPV6_RTHDR,
1184: IPPROTO_IPV6);
1185: if (*mp)
1186: mp = &(*mp)->m_next;
1187: break;
1188:
1189: case IPPROTO_UDP:
1190: case IPPROTO_TCP:
1191: case IPPROTO_ICMPV6:
1192: default:
1193: /*
1194: * stop search if we encounter an upper
1195: * layer protocol headers.
1196: */
1197: goto loopend;
1198:
1199: case IPPROTO_HOPOPTS:
1200: case IPPROTO_AH: /* is it possible? */
1201: break;
1.2 itojun 1202: }
1203:
1204: /* proceed with the next header. */
1.9 itojun 1205: off += elen;
1.2 itojun 1206: nxt = ip6e->ip6e_nxt;
1207: }
1208: loopend:
1.36 cgd 1209: ;
1.2 itojun 1210: }
1.9 itojun 1211: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1212: /* to be done */
1213: }
1.9 itojun 1214: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1215: /* to be done */
1216: }
1217: /* IN6P_RTHDR - to be done */
1218:
1219: }
1220:
1221: /*
1222: * Get pointer to the previous header followed by the header
1223: * currently processed.
1224: * XXX: This function supposes that
1225: * M includes all headers,
1226: * the next header field and the header length field of each header
1227: * are valid, and
1228: * the sum of each header length equals to OFF.
1229: * Because of these assumptions, this function must be called very
1230: * carefully. Moreover, it will not be used in the near future when
1231: * we develop `neater' mechanism to process extension headers.
1232: */
1233: char *
1234: ip6_get_prevhdr(m, off)
1235: struct mbuf *m;
1236: int off;
1237: {
1238: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1239:
1240: if (off == sizeof(struct ip6_hdr))
1241: return(&ip6->ip6_nxt);
1242: else {
1243: int len, nxt;
1244: struct ip6_ext *ip6e = NULL;
1245:
1246: nxt = ip6->ip6_nxt;
1247: len = sizeof(struct ip6_hdr);
1248: while (len < off) {
1249: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1250:
1.35 itojun 1251: switch (nxt) {
1.2 itojun 1252: case IPPROTO_FRAGMENT:
1253: len += sizeof(struct ip6_frag);
1254: break;
1255: case IPPROTO_AH:
1256: len += (ip6e->ip6e_len + 2) << 2;
1257: break;
1258: default:
1259: len += (ip6e->ip6e_len + 1) << 3;
1260: break;
1261: }
1262: nxt = ip6e->ip6e_nxt;
1263: }
1264: if (ip6e)
1265: return(&ip6e->ip6e_nxt);
1266: else
1267: return NULL;
1.18 itojun 1268: }
1269: }
1270:
1271: /*
1272: * get next header offset. m will be retained.
1273: */
1274: int
1275: ip6_nexthdr(m, off, proto, nxtp)
1276: struct mbuf *m;
1277: int off;
1278: int proto;
1279: int *nxtp;
1280: {
1281: struct ip6_hdr ip6;
1282: struct ip6_ext ip6e;
1283: struct ip6_frag fh;
1284:
1285: /* just in case */
1286: if (m == NULL)
1287: panic("ip6_nexthdr: m == NULL");
1288: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1289: return -1;
1290:
1291: switch (proto) {
1292: case IPPROTO_IPV6:
1293: if (m->m_pkthdr.len < off + sizeof(ip6))
1294: return -1;
1295: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1296: if (nxtp)
1297: *nxtp = ip6.ip6_nxt;
1298: off += sizeof(ip6);
1299: return off;
1300:
1301: case IPPROTO_FRAGMENT:
1302: /*
1303: * terminate parsing if it is not the first fragment,
1304: * it does not make sense to parse through it.
1305: */
1306: if (m->m_pkthdr.len < off + sizeof(fh))
1307: return -1;
1308: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1309: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1310: return -1;
1311: if (nxtp)
1312: *nxtp = fh.ip6f_nxt;
1313: off += sizeof(struct ip6_frag);
1314: return off;
1315:
1316: case IPPROTO_AH:
1317: if (m->m_pkthdr.len < off + sizeof(ip6e))
1318: return -1;
1319: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1320: if (nxtp)
1321: *nxtp = ip6e.ip6e_nxt;
1322: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1323: if (m->m_pkthdr.len < off)
1324: return -1;
1.18 itojun 1325: return off;
1326:
1327: case IPPROTO_HOPOPTS:
1328: case IPPROTO_ROUTING:
1329: case IPPROTO_DSTOPTS:
1330: if (m->m_pkthdr.len < off + sizeof(ip6e))
1331: return -1;
1332: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1333: if (nxtp)
1334: *nxtp = ip6e.ip6e_nxt;
1335: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1336: if (m->m_pkthdr.len < off)
1337: return -1;
1.18 itojun 1338: return off;
1339:
1340: case IPPROTO_NONE:
1341: case IPPROTO_ESP:
1342: case IPPROTO_IPCOMP:
1343: /* give up */
1344: return -1;
1345:
1346: default:
1347: return -1;
1348: }
1349:
1350: return -1;
1351: }
1352:
1353: /*
1354: * get offset for the last header in the chain. m will be kept untainted.
1355: */
1356: int
1357: ip6_lasthdr(m, off, proto, nxtp)
1358: struct mbuf *m;
1359: int off;
1360: int proto;
1361: int *nxtp;
1362: {
1363: int newoff;
1364: int nxt;
1365:
1366: if (!nxtp) {
1367: nxt = -1;
1368: nxtp = &nxt;
1369: }
1370: while (1) {
1371: newoff = ip6_nexthdr(m, off, proto, nxtp);
1372: if (newoff < 0)
1373: return off;
1374: else if (newoff < off)
1375: return -1; /* invalid */
1376: else if (newoff == off)
1377: return newoff;
1378:
1379: off = newoff;
1380: proto = *nxtp;
1.2 itojun 1381: }
1382: }
1383:
1384: /*
1385: * System control for IP6
1386: */
1387:
1388: u_char inet6ctlerrmap[PRC_NCMDS] = {
1389: 0, 0, 0, 0,
1390: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1391: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1392: EMSGSIZE, EHOSTUNREACH, 0, 0,
1393: 0, 0, 0, 0,
1394: ENOPROTOOPT
1395: };
1396:
1397: int
1398: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1399: int *name;
1400: u_int namelen;
1401: void *oldp;
1402: size_t *oldlenp;
1403: void *newp;
1404: size_t newlen;
1405: {
1.26 itojun 1406: int old, error;
1407:
1.2 itojun 1408: /* All sysctl names at this level are terminal. */
1409: if (namelen != 1)
1410: return ENOTDIR;
1411:
1412: switch (name[0]) {
1413:
1414: case IPV6CTL_FORWARDING:
1415: return sysctl_int(oldp, oldlenp, newp, newlen,
1416: &ip6_forwarding);
1417: case IPV6CTL_SENDREDIRECTS:
1418: return sysctl_int(oldp, oldlenp, newp, newlen,
1419: &ip6_sendredirects);
1420: case IPV6CTL_DEFHLIM:
1421: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1422: case IPV6CTL_MAXFRAGPACKETS:
1423: return sysctl_int(oldp, oldlenp, newp, newlen,
1424: &ip6_maxfragpackets);
1425: case IPV6CTL_ACCEPT_RTADV:
1426: return sysctl_int(oldp, oldlenp, newp, newlen,
1427: &ip6_accept_rtadv);
1428: case IPV6CTL_KEEPFAITH:
1429: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1430: case IPV6CTL_LOG_INTERVAL:
1431: return sysctl_int(oldp, oldlenp, newp, newlen,
1432: &ip6_log_interval);
1433: case IPV6CTL_HDRNESTLIMIT:
1434: return sysctl_int(oldp, oldlenp, newp, newlen,
1435: &ip6_hdrnestlimit);
1436: case IPV6CTL_DAD_COUNT:
1437: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1438: case IPV6CTL_AUTO_FLOWLABEL:
1439: return sysctl_int(oldp, oldlenp, newp, newlen,
1440: &ip6_auto_flowlabel);
1441: case IPV6CTL_DEFMCASTHLIM:
1442: return sysctl_int(oldp, oldlenp, newp, newlen,
1443: &ip6_defmcasthlim);
1.51 itojun 1444: #if NGIF > 0
1.2 itojun 1445: case IPV6CTL_GIF_HLIM:
1446: return sysctl_int(oldp, oldlenp, newp, newlen,
1447: &ip6_gif_hlim);
1.51 itojun 1448: #endif
1.2 itojun 1449: case IPV6CTL_KAME_VERSION:
1450: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1451: case IPV6CTL_USE_DEPRECATED:
1452: return sysctl_int(oldp, oldlenp, newp, newlen,
1453: &ip6_use_deprecated);
1.10 itojun 1454: case IPV6CTL_RR_PRUNE:
1455: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1456: case IPV6CTL_V6ONLY:
1457: #ifdef INET6_BINDV6ONLY
1458: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1459: #else
1460: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1461: #endif
1462: case IPV6CTL_ANONPORTMIN:
1463: old = ip6_anonportmin;
1464: error = sysctl_int(oldp, oldlenp, newp, newlen,
1465: &ip6_anonportmin);
1466: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1467: ip6_anonportmin > 65535
1468: #ifndef IPNOPRIVPORTS
1469: || ip6_anonportmin < IPV6PORT_RESERVED
1470: #endif
1471: ) {
1472: ip6_anonportmin = old;
1473: return (EINVAL);
1474: }
1475: return (error);
1476: case IPV6CTL_ANONPORTMAX:
1477: old = ip6_anonportmax;
1478: error = sysctl_int(oldp, oldlenp, newp, newlen,
1479: &ip6_anonportmax);
1480: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1481: ip6_anonportmax > 65535
1482: #ifndef IPNOPRIVPORTS
1483: || ip6_anonportmax < IPV6PORT_RESERVED
1484: #endif
1485: ) {
1486: ip6_anonportmax = old;
1487: return (EINVAL);
1488: }
1489: return (error);
1490: #ifndef IPNOPRIVPORTS
1491: case IPV6CTL_LOWPORTMIN:
1492: old = ip6_lowportmin;
1493: error = sysctl_int(oldp, oldlenp, newp, newlen,
1494: &ip6_lowportmin);
1495: if (ip6_lowportmin >= ip6_lowportmax ||
1496: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1497: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1498: ip6_lowportmin = old;
1499: return (EINVAL);
1500: }
1501: return (error);
1502: case IPV6CTL_LOWPORTMAX:
1503: old = ip6_lowportmax;
1504: error = sysctl_int(oldp, oldlenp, newp, newlen,
1505: &ip6_lowportmax);
1506: if (ip6_lowportmin >= ip6_lowportmax ||
1507: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1508: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1509: ip6_lowportmax = old;
1510: return (EINVAL);
1511: }
1512: return (error);
1.11 itojun 1513: #endif
1.52.2.1! gehenna 1514: case IPV6CTL_MAXFRAGS:
! 1515: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2 itojun 1516: default:
1517: return EOPNOTSUPP;
1518: }
1519: /* NOTREACHED */
1520: }
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