Annotation of src/sys/netinet6/ip6_input.c, Revision 1.41.2.2
1.41.2.2! thorpej 1: /* $NetBSD: ip6_input.c,v 1.41.2.1 2001/08/25 06:17:05 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.
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: */
67:
1.41.2.2! thorpej 68: #include <sys/cdefs.h>
! 69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.51 2001/12/22 01:40:03 itojun Exp $");
! 70:
1.2 itojun 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>
1.41.2.2! thorpej 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>
1.41.2.2! thorpej 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"
125:
1.41.2.2! thorpej 126: #if NGIF > 0
! 127: #include <netinet6/in6_gif.h>
! 128: #endif
! 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: struct timeval tv;
164:
165: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
166: if (pr == 0)
167: panic("ip6_init");
168: for (i = 0; i < IPPROTO_MAX; i++)
169: ip6_protox[i] = pr - inet6sw;
170: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
171: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
172: if (pr->pr_domain->dom_family == PF_INET6 &&
173: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
174: ip6_protox[pr->pr_protocol] = pr - inet6sw;
175: ip6intrq.ifq_maxlen = ip6qmaxlen;
176: nd6_init();
177: frag6_init();
178: /*
179: * in many cases, random() here does NOT return random number
180: * as initialization during bootstrap time occur in fixed order.
181: */
182: microtime(&tv);
183: ip6_flow_seq = random() ^ tv.tv_usec;
184:
185: ip6_init2((void *)0);
1.29 thorpej 186:
187: #ifdef PFIL_HOOKS
188: /* Register our Packet Filter hook. */
1.33 thorpej 189: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
190: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 191: i = pfil_head_register(&inet6_pfil_hook);
192: if (i != 0)
193: printf("ip6_init: WARNING: unable to register pfil hook, "
194: "error %d\n", i);
195: #endif /* PFIL_HOOKS */
1.2 itojun 196: }
197:
198: static void
199: ip6_init2(dummy)
200: void *dummy;
201: {
202: /*
203: * to route local address of p2p link to loopback,
1.21 itojun 204: * assign loopback address first.
1.2 itojun 205: */
1.20 itojun 206: in6_ifattach(&loif[0], NULL);
1.2 itojun 207:
208: /* nd6_timer_init */
1.19 thorpej 209: callout_init(&nd6_timer_ch);
210: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 211: /* router renumbering prefix list maintenance */
1.19 thorpej 212: callout_init(&in6_rr_timer_ch);
213: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 214: }
215:
216: /*
217: * IP6 input interrupt handling. Just pass the packet to ip6_input.
218: */
219: void
220: ip6intr()
221: {
222: int s;
223: struct mbuf *m;
224:
225: for (;;) {
1.41 thorpej 226: s = splnet();
1.2 itojun 227: IF_DEQUEUE(&ip6intrq, m);
228: splx(s);
229: if (m == 0)
230: return;
231: ip6_input(m);
232: }
233: }
234:
235: extern struct route_in6 ip6_forward_rt;
236:
237: void
238: ip6_input(m)
239: struct mbuf *m;
240: {
1.9 itojun 241: struct ip6_hdr *ip6;
1.2 itojun 242: int off = sizeof(struct ip6_hdr), nest;
243: u_int32_t plen;
1.5 itojun 244: u_int32_t rtalert = ~0;
1.2 itojun 245: int nxt, ours = 0;
1.9 itojun 246: struct ifnet *deliverifp = NULL;
1.2 itojun 247:
248: #ifdef IPSEC
249: /*
250: * should the inner packet be considered authentic?
251: * see comment in ah4_input().
252: */
1.41.2.2! thorpej 253: m->m_flags &= ~M_AUTHIPHDR;
! 254: m->m_flags &= ~M_AUTHIPDGM;
1.2 itojun 255: #endif
1.9 itojun 256:
1.2 itojun 257: /*
1.41.2.2! thorpej 258: * mbuf statistics
1.2 itojun 259: */
260: if (m->m_flags & M_EXT) {
261: if (m->m_next)
262: ip6stat.ip6s_mext2m++;
263: else
264: ip6stat.ip6s_mext1++;
265: } else {
1.40 itojun 266: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 267: if (m->m_next) {
1.9 itojun 268: if (m->m_flags & M_LOOP) {
1.41.2.2! thorpej 269: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 270: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 271: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
272: else
273: ip6stat.ip6s_m2m[0]++;
274: } else
275: ip6stat.ip6s_m1++;
1.40 itojun 276: #undef M2MMAX
1.2 itojun 277: }
278:
1.9 itojun 279: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
280: ip6stat.ip6s_total++;
281:
282: #ifndef PULLDOWN_TEST
283: /* XXX is the line really necessary? */
1.2 itojun 284: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 285: #endif
1.2 itojun 286:
1.9 itojun 287: if (m->m_len < sizeof(struct ip6_hdr)) {
288: struct ifnet *inifp;
289: inifp = m->m_pkthdr.rcvif;
290: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
291: ip6stat.ip6s_toosmall++;
292: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
293: return;
294: }
1.2 itojun 295: }
296:
297: ip6 = mtod(m, struct ip6_hdr *);
298:
299: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
300: ip6stat.ip6s_badvers++;
1.9 itojun 301: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 302: goto bad;
303: }
1.15 darrenr 304:
305: #ifdef PFIL_HOOKS
306: /*
307: * Run through list of hooks for input packets. If there are any
308: * filters which require that additional packets in the flow are
309: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
310: * Note that filters must _never_ set this flag, as another filter
311: * in the list may have previously cleared it.
312: */
1.39 itojun 313: /*
314: * let ipfilter look at packet on the wire,
315: * not the decapsulated packet.
316: */
317: #ifdef IPSEC
1.41.2.1 thorpej 318: if (!ipsec_getnhist(m))
1.39 itojun 319: #else
320: if (1)
321: #endif
322: {
323: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
324: PFIL_IN) != 0)
325: return;
326: if (m == NULL)
327: return;
328: ip6 = mtod(m, struct ip6_hdr *);
329: }
1.15 darrenr 330: #endif /* PFIL_HOOKS */
331:
1.2 itojun 332: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
333:
1.30 thorpej 334: #ifdef ALTQ
335: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
336: /* packet is dropped by traffic conditioner */
337: return;
1.9 itojun 338: }
339: #endif
340:
1.2 itojun 341: /*
1.41.2.2! thorpej 342: * Check against address spoofing/corruption.
1.2 itojun 343: */
344: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
345: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
346: ip6stat.ip6s_badscope++;
1.9 itojun 347: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 348: goto bad;
349: }
1.13 itojun 350: /*
1.41.2.2! thorpej 351: * The following check is not documented in specs. A malicious
! 352: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
! 353: * and bypass security checks (act as if it was from 127.0.0.1 by using
! 354: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 355: *
1.41.2.2! thorpej 356: * This check chokes if we are in an SIIT cloud. As none of BSDs
! 357: * support IPv4-less kernel compilation, we cannot support SIIT
! 358: * environment at all. So, it makes more sense for us to reject any
! 359: * malicious packets for non-SIIT environment, than try to do a
! 360: * partical support for SIIT environment.
1.13 itojun 361: */
362: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
363: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
364: ip6stat.ip6s_badscope++;
365: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
366: goto bad;
367: }
1.17 itojun 368: #if 0
1.13 itojun 369: /*
1.17 itojun 370: * Reject packets with IPv4 compatible addresses (auto tunnel).
371: *
372: * The code forbids auto tunnel relay case in RFC1933 (the check is
373: * stronger than RFC1933). We may want to re-enable it if mech-xx
374: * is revised to forbid relaying case.
1.13 itojun 375: */
376: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
377: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
378: ip6stat.ip6s_badscope++;
379: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
380: goto bad;
381: }
382: #endif
1.35 itojun 383:
1.2 itojun 384: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
385: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
386: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
387: ours = 1;
1.9 itojun 388: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 389: goto hbhcheck;
390: } else {
391: ip6stat.ip6s_badscope++;
1.9 itojun 392: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 393: goto bad;
394: }
395: }
396:
1.38 itojun 397: /* drop packets if interface ID portion is already filled */
398: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
399: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
400: ip6->ip6_src.s6_addr16[1]) {
401: ip6stat.ip6s_badscope++;
402: goto bad;
403: }
404: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
405: ip6->ip6_dst.s6_addr16[1]) {
406: ip6stat.ip6s_badscope++;
407: goto bad;
408: }
409: }
1.2 itojun 410:
1.40 itojun 411: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
412: ip6->ip6_src.s6_addr16[1]
413: = htons(m->m_pkthdr.rcvif->if_index);
414: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
415: ip6->ip6_dst.s6_addr16[1]
416: = htons(m->m_pkthdr.rcvif->if_index);
417:
418: /*
419: * We use rt->rt_ifp to determine if the address is ours or not.
420: * If rt_ifp is lo0, the address is ours.
421: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
422: * so any address under fe80::%lo0/64 will be mistakenly considered
423: * local. The special case is supplied to handle the case properly
424: * by actually looking at interface addresses
425: * (using in6ifa_ifpwithaddr).
426: */
427: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
428: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
429: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
430: icmp6_error(m, ICMP6_DST_UNREACH,
431: ICMP6_DST_UNREACH_ADDR, 0);
432: /* m is already freed */
433: return;
1.21 itojun 434: }
1.40 itojun 435:
436: ours = 1;
437: deliverifp = m->m_pkthdr.rcvif;
438: goto hbhcheck;
1.9 itojun 439: }
440:
1.2 itojun 441: /*
442: * Multicast check
443: */
444: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
445: struct in6_multi *in6m = 0;
1.9 itojun 446:
447: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 448: /*
449: * See if we belong to the destination multicast group on the
450: * arrival interface.
451: */
452: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
453: if (in6m)
454: ours = 1;
455: else if (!ip6_mrouter) {
456: ip6stat.ip6s_notmember++;
457: ip6stat.ip6s_cantforward++;
1.9 itojun 458: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 459: goto bad;
460: }
1.9 itojun 461: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 462: goto hbhcheck;
463: }
464:
465: /*
466: * Unicast check
467: */
1.22 itojun 468: if (ip6_forward_rt.ro_rt != NULL &&
469: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
470: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 471: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 472: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 473: else {
1.35 itojun 474: struct sockaddr_in6 *dst6;
475:
1.2 itojun 476: if (ip6_forward_rt.ro_rt) {
1.22 itojun 477: /* route is down or destination is different */
1.25 itojun 478: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 479: RTFREE(ip6_forward_rt.ro_rt);
480: ip6_forward_rt.ro_rt = 0;
481: }
1.22 itojun 482:
1.2 itojun 483: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 484: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
485: dst6->sin6_len = sizeof(struct sockaddr_in6);
486: dst6->sin6_family = AF_INET6;
487: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 488:
1.9 itojun 489: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 490: }
491:
492: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
493:
494: /*
495: * Accept the packet if the forwarding interface to the destination
496: * according to the routing table is the loopback interface,
497: * unless the associated route has a gateway.
498: * Note that this approach causes to accept a packet if there is a
499: * route to the loopback interface for the destination of the packet.
500: * But we think it's even useful in some situations, e.g. when using
501: * a special daemon which wants to intercept the packet.
502: */
503: if (ip6_forward_rt.ro_rt &&
504: (ip6_forward_rt.ro_rt->rt_flags &
505: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
506: #if 0
507: /*
508: * The check below is redundant since the comparison of
509: * the destination and the key of the rtentry has
510: * already done through looking up the routing table.
511: */
512: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
513: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
514: #endif
1.9 itojun 515: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 516: struct in6_ifaddr *ia6 =
517: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
518: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
519: m->m_flags |= M_ANYCAST6;
1.24 itojun 520: /*
521: * packets to a tentative, duplicated, or somehow invalid
522: * address must not be accepted.
523: */
1.2 itojun 524: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 525: /* this address is ready */
1.2 itojun 526: ours = 1;
1.9 itojun 527: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 528: goto hbhcheck;
529: } else {
1.24 itojun 530: /* address is not ready, so discard the packet. */
1.34 itojun 531: nd6log((LOG_INFO,
1.27 itojun 532: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 533: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 534: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 535:
536: goto bad;
1.2 itojun 537: }
538: }
539:
540: /*
541: * FAITH(Firewall Aided Internet Translator)
542: */
543: #if defined(NFAITH) && 0 < NFAITH
544: if (ip6_keepfaith) {
545: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
546: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
547: /* XXX do we need more sanity checks? */
548: ours = 1;
1.41.2.2! thorpej 549: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 550: goto hbhcheck;
551: }
552: }
553: #endif
554:
555: #if 0
556: {
557: /*
558: * Last resort: check in6_ifaddr for incoming interface.
559: * The code is here until I update the "goto ours hack" code above
560: * working right.
561: */
562: struct ifaddr *ifa;
563: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
564: ifa;
565: ifa = ifa->ifa_list.tqe_next) {
566: if (ifa->ifa_addr == NULL)
567: continue; /* just for safety */
568: if (ifa->ifa_addr->sa_family != AF_INET6)
569: continue;
570: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
571: ours = 1;
572: deliverifp = ifa->ifa_ifp;
1.2 itojun 573: goto hbhcheck;
574: }
575: }
1.9 itojun 576: }
1.2 itojun 577: #endif
578:
579: /*
580: * Now there is no reason to process the packet if it's not our own
581: * and we're not a router.
582: */
583: if (!ip6_forwarding) {
584: ip6stat.ip6s_cantforward++;
1.9 itojun 585: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 586: goto bad;
587: }
588:
589: hbhcheck:
590: /*
591: * Process Hop-by-Hop options header if it's contained.
592: * m may be modified in ip6_hopopts_input().
593: * If a JumboPayload option is included, plen will also be modified.
594: */
595: plen = (u_int32_t)ntohs(ip6->ip6_plen);
596: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 597: struct ip6_hbh *hbh;
598:
599: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
600: #if 0 /*touches NULL pointer*/
601: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
602: #endif
1.2 itojun 603: return; /* m have already been freed */
1.9 itojun 604: }
1.22 itojun 605:
1.2 itojun 606: /* adjust pointer */
607: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 608:
609: /*
1.41.2.2! thorpej 610: * if the payload length field is 0 and the next header field
1.22 itojun 611: * indicates Hop-by-Hop Options header, then a Jumbo Payload
612: * option MUST be included.
613: */
614: if (ip6->ip6_plen == 0 && plen == 0) {
615: /*
616: * Note that if a valid jumbo payload option is
617: * contained, ip6_hoptops_input() must set a valid
618: * (non-zero) payload length to the variable plen.
619: */
620: ip6stat.ip6s_badoptions++;
621: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
622: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
623: icmp6_error(m, ICMP6_PARAM_PROB,
624: ICMP6_PARAMPROB_HEADER,
625: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
626: return;
627: }
1.9 itojun 628: #ifndef PULLDOWN_TEST
629: /* ip6_hopopts_input() ensures that mbuf is contiguous */
630: hbh = (struct ip6_hbh *)(ip6 + 1);
631: #else
632: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
633: sizeof(struct ip6_hbh));
634: if (hbh == NULL) {
635: ip6stat.ip6s_tooshort++;
636: return;
637: }
638: #endif
639: nxt = hbh->ip6h_nxt;
1.2 itojun 640:
641: /*
642: * accept the packet if a router alert option is included
643: * and we act as an IPv6 router.
644: */
1.5 itojun 645: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 646: ours = 1;
647: } else
648: nxt = ip6->ip6_nxt;
649:
650: /*
651: * Check that the amount of data in the buffers
652: * is as at least much as the IPv6 header would have us expect.
653: * Trim mbufs if longer than we expect.
654: * Drop packet if shorter than we expect.
655: */
656: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
657: ip6stat.ip6s_tooshort++;
1.9 itojun 658: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 659: goto bad;
660: }
661: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
662: if (m->m_len == m->m_pkthdr.len) {
663: m->m_len = sizeof(struct ip6_hdr) + plen;
664: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
665: } else
666: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
667: }
668:
669: /*
670: * Forward if desirable.
671: */
672: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
673: /*
674: * If we are acting as a multicast router, all
675: * incoming multicast packets are passed to the
676: * kernel-level multicast forwarding function.
677: * The packet is returned (relatively) intact; if
678: * ip6_mforward() returns a non-zero value, the packet
679: * must be discarded, else it may be accepted below.
680: */
681: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
682: ip6stat.ip6s_cantforward++;
683: m_freem(m);
684: return;
685: }
686: if (!ours) {
687: m_freem(m);
688: return;
689: }
1.22 itojun 690: } else if (!ours) {
1.2 itojun 691: ip6_forward(m, 0);
692: return;
693: }
1.25 itojun 694:
695: ip6 = mtod(m, struct ip6_hdr *);
696:
697: /*
698: * Malicious party may be able to use IPv4 mapped addr to confuse
699: * tcp/udp stack and bypass security checks (act as if it was from
700: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
701: *
702: * For SIIT end node behavior, you may want to disable the check.
703: * However, you will become vulnerable to attacks using IPv4 mapped
704: * source.
705: */
706: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
707: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
708: ip6stat.ip6s_badscope++;
709: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
710: goto bad;
711: }
1.2 itojun 712:
713: /*
714: * Tell launch routine the next header
715: */
1.12 itojun 716: #ifdef IFA_STATS
1.28 itojun 717: if (deliverifp != NULL) {
1.9 itojun 718: struct in6_ifaddr *ia6;
719: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
720: if (ia6)
721: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
722: }
723: #endif
1.2 itojun 724: ip6stat.ip6s_delivered++;
1.9 itojun 725: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 726: nest = 0;
1.40 itojun 727:
1.2 itojun 728: while (nxt != IPPROTO_DONE) {
729: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
730: ip6stat.ip6s_toomanyhdr++;
731: goto bad;
732: }
1.8 itojun 733:
734: /*
735: * protection against faulty packet - there should be
736: * more sanity checks in header chain processing.
737: */
738: if (m->m_pkthdr.len < off) {
739: ip6stat.ip6s_tooshort++;
1.9 itojun 740: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 741: goto bad;
742: }
743:
1.37 itojun 744: #ifdef IPSEC
745: /*
746: * enforce IPsec policy checking if we are seeing last header.
747: * note that we do not visit this with protocols with pcb layer
748: * code - like udp/tcp/raw ip.
749: */
750: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
751: ipsec6_in_reject(m, NULL)) {
752: ipsec6stat.in_polvio++;
753: goto bad;
754: }
755: #endif
756:
1.2 itojun 757: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
758: }
759: return;
760: bad:
761: m_freem(m);
762: }
763:
764: /*
765: * Hop-by-Hop options header processing. If a valid jumbo payload option is
766: * included, the real payload length will be stored in plenp.
767: */
768: static int
769: ip6_hopopts_input(plenp, rtalertp, mp, offp)
770: u_int32_t *plenp;
1.5 itojun 771: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 772: struct mbuf **mp;
773: int *offp;
774: {
1.35 itojun 775: struct mbuf *m = *mp;
1.2 itojun 776: int off = *offp, hbhlen;
777: struct ip6_hbh *hbh;
778: u_int8_t *opt;
779:
780: /* validation of the length of the header */
1.9 itojun 781: #ifndef PULLDOWN_TEST
1.2 itojun 782: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
783: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
784: hbhlen = (hbh->ip6h_len + 1) << 3;
785:
786: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
787: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 788: #else
789: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
790: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
791: if (hbh == NULL) {
792: ip6stat.ip6s_tooshort++;
793: return -1;
794: }
795: hbhlen = (hbh->ip6h_len + 1) << 3;
796: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
797: hbhlen);
798: if (hbh == NULL) {
799: ip6stat.ip6s_tooshort++;
800: return -1;
801: }
802: #endif
1.2 itojun 803: off += hbhlen;
804: hbhlen -= sizeof(struct ip6_hbh);
805: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
806:
807: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
808: hbhlen, rtalertp, plenp) < 0)
809: return(-1);
810:
811: *offp = off;
812: *mp = m;
813: return(0);
814: }
815:
816: /*
817: * Search header for all Hop-by-hop options and process each option.
818: * This function is separate from ip6_hopopts_input() in order to
819: * handle a case where the sending node itself process its hop-by-hop
820: * options header. In such a case, the function is called from ip6_output().
821: */
822: int
823: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
824: struct mbuf *m;
825: u_int8_t *opthead;
826: int hbhlen;
1.5 itojun 827: u_int32_t *rtalertp;
1.2 itojun 828: u_int32_t *plenp;
829: {
830: struct ip6_hdr *ip6;
831: int optlen = 0;
832: u_int8_t *opt = opthead;
833: u_int16_t rtalert_val;
1.22 itojun 834: u_int32_t jumboplen;
1.2 itojun 835:
836: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 837: switch (*opt) {
838: case IP6OPT_PAD1:
839: optlen = 1;
840: break;
841: case IP6OPT_PADN:
842: if (hbhlen < IP6OPT_MINLEN) {
843: ip6stat.ip6s_toosmall++;
844: goto bad;
845: }
846: optlen = *(opt + 1) + 2;
847: break;
848: case IP6OPT_RTALERT:
849: /* XXX may need check for alignment */
850: if (hbhlen < IP6OPT_RTALERT_LEN) {
851: ip6stat.ip6s_toosmall++;
852: goto bad;
853: }
854: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
855: /* XXX: should we discard the packet? */
856: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
857: *(opt + 1));
858: }
859: optlen = IP6OPT_RTALERT_LEN;
860: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
861: *rtalertp = ntohs(rtalert_val);
862: break;
863: case IP6OPT_JUMBO:
1.22 itojun 864: /* XXX may need check for alignment */
865: if (hbhlen < IP6OPT_JUMBO_LEN) {
866: ip6stat.ip6s_toosmall++;
867: goto bad;
868: }
1.35 itojun 869: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
870: /* XXX: should we discard the packet? */
1.22 itojun 871: log(LOG_ERR, "length of jumbopayload opt "
1.27 itojun 872: "is inconsistent(%d)\n",
1.22 itojun 873: *(opt + 1));
1.35 itojun 874: }
1.22 itojun 875: optlen = IP6OPT_JUMBO_LEN;
876:
877: /*
878: * IPv6 packets that have non 0 payload length
1.35 itojun 879: * must not contain a jumbo payload option.
1.22 itojun 880: */
881: ip6 = mtod(m, struct ip6_hdr *);
882: if (ip6->ip6_plen) {
883: ip6stat.ip6s_badoptions++;
884: icmp6_error(m, ICMP6_PARAM_PROB,
885: ICMP6_PARAMPROB_HEADER,
886: sizeof(struct ip6_hdr) +
887: sizeof(struct ip6_hbh) +
888: opt - opthead);
889: return(-1);
890: }
1.2 itojun 891:
1.22 itojun 892: /*
893: * We may see jumbolen in unaligned location, so
894: * we'd need to perform bcopy().
895: */
896: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
897: jumboplen = (u_int32_t)htonl(jumboplen);
898:
899: #if 1
900: /*
901: * if there are multiple jumbo payload options,
902: * *plenp will be non-zero and the packet will be
903: * rejected.
904: * the behavior may need some debate in ipngwg -
905: * multiple options does not make sense, however,
906: * there's no explicit mention in specification.
907: */
908: if (*plenp != 0) {
909: ip6stat.ip6s_badoptions++;
910: icmp6_error(m, ICMP6_PARAM_PROB,
911: ICMP6_PARAMPROB_HEADER,
912: sizeof(struct ip6_hdr) +
913: sizeof(struct ip6_hbh) +
914: opt + 2 - opthead);
915: return(-1);
916: }
1.8 itojun 917: #endif
1.2 itojun 918:
1.22 itojun 919: /*
920: * jumbo payload length must be larger than 65535.
921: */
922: if (jumboplen <= IPV6_MAXPACKET) {
923: ip6stat.ip6s_badoptions++;
924: icmp6_error(m, ICMP6_PARAM_PROB,
925: ICMP6_PARAMPROB_HEADER,
926: sizeof(struct ip6_hdr) +
927: sizeof(struct ip6_hbh) +
928: opt + 2 - opthead);
929: return(-1);
930: }
931: *plenp = jumboplen;
932:
933: break;
1.35 itojun 934: default: /* unknown option */
935: if (hbhlen < IP6OPT_MINLEN) {
936: ip6stat.ip6s_toosmall++;
937: goto bad;
938: }
939: if ((optlen = ip6_unknown_opt(opt, m,
940: sizeof(struct ip6_hdr) +
941: sizeof(struct ip6_hbh) +
942: opt - opthead)) == -1)
943: return(-1);
944: optlen += 2;
945: break;
1.2 itojun 946: }
947: }
948:
949: return(0);
950:
951: bad:
952: m_freem(m);
953: return(-1);
954: }
955:
956: /*
957: * Unknown option processing.
958: * The third argument `off' is the offset from the IPv6 header to the option,
959: * which is necessary if the IPv6 header the and option header and IPv6 header
960: * is not continuous in order to return an ICMPv6 error.
961: */
962: int
963: ip6_unknown_opt(optp, m, off)
964: u_int8_t *optp;
965: struct mbuf *m;
966: int off;
967: {
968: struct ip6_hdr *ip6;
969:
1.35 itojun 970: switch (IP6OPT_TYPE(*optp)) {
971: case IP6OPT_TYPE_SKIP: /* ignore the option */
972: return((int)*(optp + 1));
973: case IP6OPT_TYPE_DISCARD: /* silently discard */
974: m_freem(m);
975: return(-1);
976: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
977: ip6stat.ip6s_badoptions++;
978: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
979: return(-1);
980: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
981: ip6stat.ip6s_badoptions++;
982: ip6 = mtod(m, struct ip6_hdr *);
983: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
984: (m->m_flags & (M_BCAST|M_MCAST)))
985: m_freem(m);
986: else
987: icmp6_error(m, ICMP6_PARAM_PROB,
988: ICMP6_PARAMPROB_OPTION, off);
989: return(-1);
1.2 itojun 990: }
991:
992: m_freem(m); /* XXX: NOTREACHED */
993: return(-1);
994: }
995:
996: /*
1.9 itojun 997: * Create the "control" list for this pcb.
998: *
999: * The routine will be called from upper layer handlers like tcp6_input().
1000: * Thus the routine assumes that the caller (tcp6_input) have already
1001: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1002: * very first mbuf on the mbuf chain.
1003: * We may want to add some infinite loop prevention or sanity checks for safety.
1004: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1005: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1006: */
1007: void
1008: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 1009: struct in6pcb *in6p;
1010: struct mbuf **mp;
1011: struct ip6_hdr *ip6;
1012: struct mbuf *m;
1.2 itojun 1013: {
1014: struct proc *p = curproc; /* XXX */
1.9 itojun 1015: int privileged;
1.2 itojun 1016:
1.9 itojun 1017: privileged = 0;
1018: if (p && !suser(p->p_ucred, &p->p_acflag))
1019: privileged++;
1020:
1021: #ifdef SO_TIMESTAMP
1.2 itojun 1022: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1023: struct timeval tv;
1024:
1025: microtime(&tv);
1026: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1027: SCM_TIMESTAMP, SOL_SOCKET);
1028: if (*mp)
1029: mp = &(*mp)->m_next;
1030: }
1.9 itojun 1031: #endif
1.2 itojun 1032: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1033: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1034: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1035: IPPROTO_IPV6);
1036: if (*mp)
1037: mp = &(*mp)->m_next;
1038: }
1039:
1040: #ifdef noyet
1041: /* options were tossed above */
1042: if (in6p->in6p_flags & IN6P_RECVOPTS)
1043: /* broken */
1044: /* ip6_srcroute doesn't do what we want here, need to fix */
1045: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1046: /* broken */
1047: #endif
1048:
1049: /* RFC 2292 sec. 5 */
1.35 itojun 1050: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1051: struct in6_pktinfo pi6;
1052: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1053: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1054: pi6.ipi6_addr.s6_addr16[1] = 0;
1055: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1056: ? m->m_pkthdr.rcvif->if_index
1057: : 0;
1058: *mp = sbcreatecontrol((caddr_t) &pi6,
1059: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1060: IPPROTO_IPV6);
1061: if (*mp)
1062: mp = &(*mp)->m_next;
1063: }
1064: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1065: int hlim = ip6->ip6_hlim & 0xff;
1066: *mp = sbcreatecontrol((caddr_t) &hlim,
1067: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1068: if (*mp)
1069: mp = &(*mp)->m_next;
1070: }
1071: /* IN6P_NEXTHOP - for outgoing packet only */
1072:
1073: /*
1074: * IPV6_HOPOPTS socket option. We require super-user privilege
1075: * for the option, but it might be too strict, since there might
1076: * be some hop-by-hop options which can be returned to normal user.
1077: * See RFC 2292 section 6.
1078: */
1.35 itojun 1079: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1080: /*
1081: * Check if a hop-by-hop options header is contatined in the
1082: * received packet, and if so, store the options as ancillary
1083: * data. Note that a hop-by-hop options header must be
1084: * just after the IPv6 header, which fact is assured through
1085: * the IPv6 input processing.
1086: */
1087: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1088: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1089: struct ip6_hbh *hbh;
1090: int hbhlen;
1091:
1092: #ifndef PULLDOWN_TEST
1093: hbh = (struct ip6_hbh *)(ip6 + 1);
1094: hbhlen = (hbh->ip6h_len + 1) << 3;
1095: #else
1096: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1097: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1098: if (hbh == NULL) {
1099: ip6stat.ip6s_tooshort++;
1100: return;
1101: }
1102: hbhlen = (hbh->ip6h_len + 1) << 3;
1103: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1104: sizeof(struct ip6_hdr), hbhlen);
1105: if (hbh == NULL) {
1106: ip6stat.ip6s_tooshort++;
1107: return;
1108: }
1109: #endif
1.2 itojun 1110:
1111: /*
1112: * XXX: We copy whole the header even if a jumbo
1113: * payload option is included, which option is to
1114: * be removed before returning in the RFC 2292.
1115: * But it's too painful operation...
1116: */
1.9 itojun 1117: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1118: IPV6_HOPOPTS, IPPROTO_IPV6);
1119: if (*mp)
1120: mp = &(*mp)->m_next;
1121: }
1122: }
1123:
1124: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1125: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1126: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1127: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1128:
1129: /*
1130: * Search for destination options headers or routing
1131: * header(s) through the header chain, and stores each
1132: * header as ancillary data.
1133: * Note that the order of the headers remains in
1134: * the chain of ancillary data.
1135: */
1.35 itojun 1136: while (1) { /* is explicit loop prevention necessary? */
1.9 itojun 1137: struct ip6_ext *ip6e;
1138: int elen;
1139:
1140: #ifndef PULLDOWN_TEST
1141: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1142: if (nxt == IPPROTO_AH)
1143: elen = (ip6e->ip6e_len + 2) << 2;
1144: else
1145: elen = (ip6e->ip6e_len + 1) << 3;
1146: #else
1147: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1148: sizeof(struct ip6_ext));
1149: if (ip6e == NULL) {
1150: ip6stat.ip6s_tooshort++;
1151: return;
1152: }
1153: if (nxt == IPPROTO_AH)
1154: elen = (ip6e->ip6e_len + 2) << 2;
1155: else
1156: elen = (ip6e->ip6e_len + 1) << 3;
1157: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1158: if (ip6e == NULL) {
1159: ip6stat.ip6s_tooshort++;
1160: return;
1161: }
1162: #endif
1.2 itojun 1163:
1.35 itojun 1164: switch (nxt) {
1165: case IPPROTO_DSTOPTS:
1166: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1167: break;
1168:
1169: /*
1170: * We also require super-user privilege for
1171: * the option.
1172: * See the comments on IN6_HOPOPTS.
1173: */
1174: if (!privileged)
1175: break;
1176:
1177: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1178: IPV6_DSTOPTS,
1179: IPPROTO_IPV6);
1180: if (*mp)
1181: mp = &(*mp)->m_next;
1182: break;
1183:
1184: case IPPROTO_ROUTING:
1185: if (!in6p->in6p_flags & IN6P_RTHDR)
1186: break;
1187:
1188: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1189: IPV6_RTHDR,
1190: IPPROTO_IPV6);
1191: if (*mp)
1192: mp = &(*mp)->m_next;
1193: break;
1194:
1195: case IPPROTO_UDP:
1196: case IPPROTO_TCP:
1197: case IPPROTO_ICMPV6:
1198: default:
1199: /*
1200: * stop search if we encounter an upper
1201: * layer protocol headers.
1202: */
1203: goto loopend;
1204:
1205: case IPPROTO_HOPOPTS:
1206: case IPPROTO_AH: /* is it possible? */
1207: break;
1.2 itojun 1208: }
1209:
1210: /* proceed with the next header. */
1.9 itojun 1211: off += elen;
1.2 itojun 1212: nxt = ip6e->ip6e_nxt;
1213: }
1214: loopend:
1.36 cgd 1215: ;
1.2 itojun 1216: }
1.9 itojun 1217: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1218: /* to be done */
1219: }
1.9 itojun 1220: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1221: /* to be done */
1222: }
1223: /* IN6P_RTHDR - to be done */
1224:
1225: }
1226:
1227: /*
1228: * Get pointer to the previous header followed by the header
1229: * currently processed.
1230: * XXX: This function supposes that
1231: * M includes all headers,
1232: * the next header field and the header length field of each header
1233: * are valid, and
1234: * the sum of each header length equals to OFF.
1235: * Because of these assumptions, this function must be called very
1236: * carefully. Moreover, it will not be used in the near future when
1237: * we develop `neater' mechanism to process extension headers.
1238: */
1239: char *
1240: ip6_get_prevhdr(m, off)
1241: struct mbuf *m;
1242: int off;
1243: {
1244: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1245:
1246: if (off == sizeof(struct ip6_hdr))
1247: return(&ip6->ip6_nxt);
1248: else {
1249: int len, nxt;
1250: struct ip6_ext *ip6e = NULL;
1251:
1252: nxt = ip6->ip6_nxt;
1253: len = sizeof(struct ip6_hdr);
1254: while (len < off) {
1255: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1256:
1.35 itojun 1257: switch (nxt) {
1.2 itojun 1258: case IPPROTO_FRAGMENT:
1259: len += sizeof(struct ip6_frag);
1260: break;
1261: case IPPROTO_AH:
1262: len += (ip6e->ip6e_len + 2) << 2;
1263: break;
1264: default:
1265: len += (ip6e->ip6e_len + 1) << 3;
1266: break;
1267: }
1268: nxt = ip6e->ip6e_nxt;
1269: }
1270: if (ip6e)
1271: return(&ip6e->ip6e_nxt);
1272: else
1273: return NULL;
1.18 itojun 1274: }
1275: }
1276:
1277: /*
1278: * get next header offset. m will be retained.
1279: */
1280: int
1281: ip6_nexthdr(m, off, proto, nxtp)
1282: struct mbuf *m;
1283: int off;
1284: int proto;
1285: int *nxtp;
1286: {
1287: struct ip6_hdr ip6;
1288: struct ip6_ext ip6e;
1289: struct ip6_frag fh;
1290:
1291: /* just in case */
1292: if (m == NULL)
1293: panic("ip6_nexthdr: m == NULL");
1294: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1295: return -1;
1296:
1297: switch (proto) {
1298: case IPPROTO_IPV6:
1299: if (m->m_pkthdr.len < off + sizeof(ip6))
1300: return -1;
1301: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1302: if (nxtp)
1303: *nxtp = ip6.ip6_nxt;
1304: off += sizeof(ip6);
1305: return off;
1306:
1307: case IPPROTO_FRAGMENT:
1308: /*
1309: * terminate parsing if it is not the first fragment,
1310: * it does not make sense to parse through it.
1311: */
1312: if (m->m_pkthdr.len < off + sizeof(fh))
1313: return -1;
1314: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1315: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1316: return -1;
1317: if (nxtp)
1318: *nxtp = fh.ip6f_nxt;
1319: off += sizeof(struct ip6_frag);
1320: return off;
1321:
1322: case IPPROTO_AH:
1323: if (m->m_pkthdr.len < off + sizeof(ip6e))
1324: return -1;
1325: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1326: if (nxtp)
1327: *nxtp = ip6e.ip6e_nxt;
1328: off += (ip6e.ip6e_len + 2) << 2;
1.41.2.2! thorpej 1329: if (m->m_pkthdr.len < off)
! 1330: return -1;
1.18 itojun 1331: return off;
1332:
1333: case IPPROTO_HOPOPTS:
1334: case IPPROTO_ROUTING:
1335: case IPPROTO_DSTOPTS:
1336: if (m->m_pkthdr.len < off + sizeof(ip6e))
1337: return -1;
1338: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1339: if (nxtp)
1340: *nxtp = ip6e.ip6e_nxt;
1341: off += (ip6e.ip6e_len + 1) << 3;
1.41.2.2! thorpej 1342: if (m->m_pkthdr.len < off)
! 1343: return -1;
1.18 itojun 1344: return off;
1345:
1346: case IPPROTO_NONE:
1347: case IPPROTO_ESP:
1348: case IPPROTO_IPCOMP:
1349: /* give up */
1350: return -1;
1351:
1352: default:
1353: return -1;
1354: }
1355:
1356: return -1;
1357: }
1358:
1359: /*
1360: * get offset for the last header in the chain. m will be kept untainted.
1361: */
1362: int
1363: ip6_lasthdr(m, off, proto, nxtp)
1364: struct mbuf *m;
1365: int off;
1366: int proto;
1367: int *nxtp;
1368: {
1369: int newoff;
1370: int nxt;
1371:
1372: if (!nxtp) {
1373: nxt = -1;
1374: nxtp = &nxt;
1375: }
1376: while (1) {
1377: newoff = ip6_nexthdr(m, off, proto, nxtp);
1378: if (newoff < 0)
1379: return off;
1380: else if (newoff < off)
1381: return -1; /* invalid */
1382: else if (newoff == off)
1383: return newoff;
1384:
1385: off = newoff;
1386: proto = *nxtp;
1.2 itojun 1387: }
1388: }
1389:
1390: /*
1391: * System control for IP6
1392: */
1393:
1394: u_char inet6ctlerrmap[PRC_NCMDS] = {
1395: 0, 0, 0, 0,
1396: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1397: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1398: EMSGSIZE, EHOSTUNREACH, 0, 0,
1399: 0, 0, 0, 0,
1400: ENOPROTOOPT
1401: };
1402:
1403: int
1404: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1405: int *name;
1406: u_int namelen;
1407: void *oldp;
1408: size_t *oldlenp;
1409: void *newp;
1410: size_t newlen;
1411: {
1.26 itojun 1412: int old, error;
1413:
1.2 itojun 1414: /* All sysctl names at this level are terminal. */
1415: if (namelen != 1)
1416: return ENOTDIR;
1417:
1418: switch (name[0]) {
1419:
1420: case IPV6CTL_FORWARDING:
1421: return sysctl_int(oldp, oldlenp, newp, newlen,
1422: &ip6_forwarding);
1423: case IPV6CTL_SENDREDIRECTS:
1424: return sysctl_int(oldp, oldlenp, newp, newlen,
1425: &ip6_sendredirects);
1426: case IPV6CTL_DEFHLIM:
1427: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1428: case IPV6CTL_MAXFRAGPACKETS:
1429: return sysctl_int(oldp, oldlenp, newp, newlen,
1430: &ip6_maxfragpackets);
1431: case IPV6CTL_ACCEPT_RTADV:
1432: return sysctl_int(oldp, oldlenp, newp, newlen,
1433: &ip6_accept_rtadv);
1434: case IPV6CTL_KEEPFAITH:
1435: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1436: case IPV6CTL_LOG_INTERVAL:
1437: return sysctl_int(oldp, oldlenp, newp, newlen,
1438: &ip6_log_interval);
1439: case IPV6CTL_HDRNESTLIMIT:
1440: return sysctl_int(oldp, oldlenp, newp, newlen,
1441: &ip6_hdrnestlimit);
1442: case IPV6CTL_DAD_COUNT:
1443: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1444: case IPV6CTL_AUTO_FLOWLABEL:
1445: return sysctl_int(oldp, oldlenp, newp, newlen,
1446: &ip6_auto_flowlabel);
1447: case IPV6CTL_DEFMCASTHLIM:
1448: return sysctl_int(oldp, oldlenp, newp, newlen,
1449: &ip6_defmcasthlim);
1.41.2.2! thorpej 1450: #if NGIF > 0
1.2 itojun 1451: case IPV6CTL_GIF_HLIM:
1452: return sysctl_int(oldp, oldlenp, newp, newlen,
1453: &ip6_gif_hlim);
1.41.2.2! thorpej 1454: #endif
1.2 itojun 1455: case IPV6CTL_KAME_VERSION:
1456: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1457: case IPV6CTL_USE_DEPRECATED:
1458: return sysctl_int(oldp, oldlenp, newp, newlen,
1459: &ip6_use_deprecated);
1.10 itojun 1460: case IPV6CTL_RR_PRUNE:
1461: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.41.2.2! thorpej 1462: case IPV6CTL_V6ONLY:
! 1463: #ifdef INET6_BINDV6ONLY
! 1464: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
! 1465: #else
! 1466: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1467: #endif
1468: case IPV6CTL_ANONPORTMIN:
1469: old = ip6_anonportmin;
1470: error = sysctl_int(oldp, oldlenp, newp, newlen,
1471: &ip6_anonportmin);
1472: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1473: ip6_anonportmin > 65535
1474: #ifndef IPNOPRIVPORTS
1475: || ip6_anonportmin < IPV6PORT_RESERVED
1476: #endif
1477: ) {
1478: ip6_anonportmin = old;
1479: return (EINVAL);
1480: }
1481: return (error);
1482: case IPV6CTL_ANONPORTMAX:
1483: old = ip6_anonportmax;
1484: error = sysctl_int(oldp, oldlenp, newp, newlen,
1485: &ip6_anonportmax);
1486: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1487: ip6_anonportmax > 65535
1488: #ifndef IPNOPRIVPORTS
1489: || ip6_anonportmax < IPV6PORT_RESERVED
1490: #endif
1491: ) {
1492: ip6_anonportmax = old;
1493: return (EINVAL);
1494: }
1495: return (error);
1496: #ifndef IPNOPRIVPORTS
1497: case IPV6CTL_LOWPORTMIN:
1498: old = ip6_lowportmin;
1499: error = sysctl_int(oldp, oldlenp, newp, newlen,
1500: &ip6_lowportmin);
1501: if (ip6_lowportmin >= ip6_lowportmax ||
1502: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1503: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1504: ip6_lowportmin = old;
1505: return (EINVAL);
1506: }
1507: return (error);
1508: case IPV6CTL_LOWPORTMAX:
1509: old = ip6_lowportmax;
1510: error = sysctl_int(oldp, oldlenp, newp, newlen,
1511: &ip6_lowportmax);
1512: if (ip6_lowportmin >= ip6_lowportmax ||
1513: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1514: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1515: ip6_lowportmax = old;
1516: return (EINVAL);
1517: }
1518: return (error);
1.11 itojun 1519: #endif
1.2 itojun 1520: default:
1521: return EOPNOTSUPP;
1522: }
1523: /* NOTREACHED */
1524: }
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