Annotation of src/sys/netinet6/ip6_input.c, Revision 1.48
1.48 ! lukem 1: /* $NetBSD: ip6_input.c,v 1.47 2001/11/02 08:05:48 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>
! 69: __KERNEL_RCSID(0, "$NetBSD$");
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"
125:
1.9 itojun 126: #include <net/net_osdep.h>
127:
1.2 itojun 128: extern struct domain inet6domain;
129:
130: u_char ip6_protox[IPPROTO_MAX];
131: static int ip6qmaxlen = IFQ_MAXLEN;
132: struct in6_ifaddr *in6_ifaddr;
133: struct ifqueue ip6intrq;
134:
135: extern struct ifnet loif[NLOOP];
136: int ip6_forward_srcrt; /* XXX */
137: int ip6_sourcecheck; /* XXX */
138: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 139:
1.29 thorpej 140: #ifdef PFIL_HOOKS
141: struct pfil_head inet6_pfil_hook;
142: #endif
143:
1.2 itojun 144: struct ip6stat ip6stat;
145:
146: static void ip6_init2 __P((void *));
147:
1.5 itojun 148: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 149:
150: /*
151: * IP6 initialization: fill in IP6 protocol switch table.
152: * All protocols not implemented in kernel go to raw IP6 protocol handler.
153: */
154: void
155: ip6_init()
156: {
1.35 itojun 157: struct ip6protosw *pr;
158: int i;
1.2 itojun 159: struct timeval tv;
160:
161: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
162: if (pr == 0)
163: panic("ip6_init");
164: for (i = 0; i < IPPROTO_MAX; i++)
165: ip6_protox[i] = pr - inet6sw;
166: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
167: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
168: if (pr->pr_domain->dom_family == PF_INET6 &&
169: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
170: ip6_protox[pr->pr_protocol] = pr - inet6sw;
171: ip6intrq.ifq_maxlen = ip6qmaxlen;
172: nd6_init();
173: frag6_init();
174: /*
175: * in many cases, random() here does NOT return random number
176: * as initialization during bootstrap time occur in fixed order.
177: */
178: microtime(&tv);
179: ip6_flow_seq = random() ^ tv.tv_usec;
180:
181: ip6_init2((void *)0);
1.29 thorpej 182:
183: #ifdef PFIL_HOOKS
184: /* Register our Packet Filter hook. */
1.33 thorpej 185: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
186: inet6_pfil_hook.ph_af = AF_INET6;
1.29 thorpej 187: i = pfil_head_register(&inet6_pfil_hook);
188: if (i != 0)
189: printf("ip6_init: WARNING: unable to register pfil hook, "
190: "error %d\n", i);
191: #endif /* PFIL_HOOKS */
1.2 itojun 192: }
193:
194: static void
195: ip6_init2(dummy)
196: void *dummy;
197: {
198: /*
199: * to route local address of p2p link to loopback,
1.21 itojun 200: * assign loopback address first.
1.2 itojun 201: */
1.20 itojun 202: in6_ifattach(&loif[0], NULL);
1.2 itojun 203:
204: /* nd6_timer_init */
1.19 thorpej 205: callout_init(&nd6_timer_ch);
206: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 207: /* router renumbering prefix list maintenance */
1.19 thorpej 208: callout_init(&in6_rr_timer_ch);
209: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 210: }
211:
212: /*
213: * IP6 input interrupt handling. Just pass the packet to ip6_input.
214: */
215: void
216: ip6intr()
217: {
218: int s;
219: struct mbuf *m;
220:
221: for (;;) {
1.41 thorpej 222: s = splnet();
1.2 itojun 223: IF_DEQUEUE(&ip6intrq, m);
224: splx(s);
225: if (m == 0)
226: return;
227: ip6_input(m);
228: }
229: }
230:
231: extern struct route_in6 ip6_forward_rt;
232:
233: void
234: ip6_input(m)
235: struct mbuf *m;
236: {
1.9 itojun 237: struct ip6_hdr *ip6;
1.2 itojun 238: int off = sizeof(struct ip6_hdr), nest;
239: u_int32_t plen;
1.5 itojun 240: u_int32_t rtalert = ~0;
1.2 itojun 241: int nxt, ours = 0;
1.9 itojun 242: struct ifnet *deliverifp = NULL;
1.2 itojun 243:
244: #ifdef IPSEC
245: /*
246: * should the inner packet be considered authentic?
247: * see comment in ah4_input().
248: */
249: if (m) {
250: m->m_flags &= ~M_AUTHIPHDR;
251: m->m_flags &= ~M_AUTHIPDGM;
252: }
253: #endif
1.9 itojun 254:
1.2 itojun 255: /*
1.44 itojun 256: * mbuf statistics
1.2 itojun 257: */
258: if (m->m_flags & M_EXT) {
259: if (m->m_next)
260: ip6stat.ip6s_mext2m++;
261: else
262: ip6stat.ip6s_mext1++;
263: } else {
1.40 itojun 264: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 265: if (m->m_next) {
1.9 itojun 266: if (m->m_flags & M_LOOP) {
1.44 itojun 267: ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40 itojun 268: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 269: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
270: else
271: ip6stat.ip6s_m2m[0]++;
272: } else
273: ip6stat.ip6s_m1++;
1.40 itojun 274: #undef M2MMAX
1.2 itojun 275: }
276:
1.9 itojun 277: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
278: ip6stat.ip6s_total++;
279:
280: #ifndef PULLDOWN_TEST
281: /* XXX is the line really necessary? */
1.2 itojun 282: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 283: #endif
1.2 itojun 284:
1.9 itojun 285: if (m->m_len < sizeof(struct ip6_hdr)) {
286: struct ifnet *inifp;
287: inifp = m->m_pkthdr.rcvif;
288: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
289: ip6stat.ip6s_toosmall++;
290: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
291: return;
292: }
1.2 itojun 293: }
294:
295: ip6 = mtod(m, struct ip6_hdr *);
296:
297: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
298: ip6stat.ip6s_badvers++;
1.9 itojun 299: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 300: goto bad;
301: }
1.15 darrenr 302:
303: #ifdef PFIL_HOOKS
304: /*
305: * Run through list of hooks for input packets. If there are any
306: * filters which require that additional packets in the flow are
307: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
308: * Note that filters must _never_ set this flag, as another filter
309: * in the list may have previously cleared it.
310: */
1.39 itojun 311: /*
312: * let ipfilter look at packet on the wire,
313: * not the decapsulated packet.
314: */
315: #ifdef IPSEC
1.42 itojun 316: if (!ipsec_getnhist(m))
1.39 itojun 317: #else
318: if (1)
319: #endif
320: {
321: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
322: PFIL_IN) != 0)
323: return;
324: if (m == NULL)
325: return;
326: ip6 = mtod(m, struct ip6_hdr *);
327: }
1.15 darrenr 328: #endif /* PFIL_HOOKS */
329:
1.2 itojun 330: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
331:
1.30 thorpej 332: #ifdef ALTQ
333: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
334: /* packet is dropped by traffic conditioner */
335: return;
1.9 itojun 336: }
337: #endif
338:
1.2 itojun 339: /*
1.44 itojun 340: * Check against address spoofing/corruption.
1.2 itojun 341: */
342: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
343: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
344: ip6stat.ip6s_badscope++;
1.9 itojun 345: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 346: goto bad;
347: }
1.13 itojun 348: /*
1.44 itojun 349: * The following check is not documented in specs. A malicious
350: * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
351: * and bypass security checks (act as if it was from 127.0.0.1 by using
352: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.35 itojun 353: *
1.44 itojun 354: * This check chokes if we are in an SIIT cloud. As none of BSDs
355: * support IPv4-less kernel compilation, we cannot support SIIT
356: * environment at all. So, it makes more sense for us to reject any
357: * malicious packets for non-SIIT environment, than try to do a
358: * partical support for SIIT environment.
1.13 itojun 359: */
360: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
361: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
362: ip6stat.ip6s_badscope++;
363: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
364: goto bad;
365: }
1.17 itojun 366: #if 0
1.13 itojun 367: /*
1.17 itojun 368: * Reject packets with IPv4 compatible addresses (auto tunnel).
369: *
370: * The code forbids auto tunnel relay case in RFC1933 (the check is
371: * stronger than RFC1933). We may want to re-enable it if mech-xx
372: * is revised to forbid relaying case.
1.13 itojun 373: */
374: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
375: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
376: ip6stat.ip6s_badscope++;
377: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
378: goto bad;
379: }
380: #endif
1.35 itojun 381:
1.2 itojun 382: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
383: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
384: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
385: ours = 1;
1.9 itojun 386: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 387: goto hbhcheck;
388: } else {
389: ip6stat.ip6s_badscope++;
1.9 itojun 390: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 391: goto bad;
392: }
393: }
394:
1.38 itojun 395: /* drop packets if interface ID portion is already filled */
396: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
397: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
398: ip6->ip6_src.s6_addr16[1]) {
399: ip6stat.ip6s_badscope++;
400: goto bad;
401: }
402: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
403: ip6->ip6_dst.s6_addr16[1]) {
404: ip6stat.ip6s_badscope++;
405: goto bad;
406: }
407: }
1.2 itojun 408:
1.40 itojun 409: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
410: ip6->ip6_src.s6_addr16[1]
411: = htons(m->m_pkthdr.rcvif->if_index);
412: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
413: ip6->ip6_dst.s6_addr16[1]
414: = htons(m->m_pkthdr.rcvif->if_index);
415:
416: /*
417: * We use rt->rt_ifp to determine if the address is ours or not.
418: * If rt_ifp is lo0, the address is ours.
419: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
420: * so any address under fe80::%lo0/64 will be mistakenly considered
421: * local. The special case is supplied to handle the case properly
422: * by actually looking at interface addresses
423: * (using in6ifa_ifpwithaddr).
424: */
425: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
426: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
427: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
428: icmp6_error(m, ICMP6_DST_UNREACH,
429: ICMP6_DST_UNREACH_ADDR, 0);
430: /* m is already freed */
431: return;
1.21 itojun 432: }
1.40 itojun 433:
434: ours = 1;
435: deliverifp = m->m_pkthdr.rcvif;
436: goto hbhcheck;
1.9 itojun 437: }
438:
1.2 itojun 439: /*
440: * Multicast check
441: */
442: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
443: struct in6_multi *in6m = 0;
1.9 itojun 444:
445: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 446: /*
447: * See if we belong to the destination multicast group on the
448: * arrival interface.
449: */
450: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
451: if (in6m)
452: ours = 1;
453: else if (!ip6_mrouter) {
454: ip6stat.ip6s_notmember++;
455: ip6stat.ip6s_cantforward++;
1.9 itojun 456: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 457: goto bad;
458: }
1.9 itojun 459: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 460: goto hbhcheck;
461: }
462:
463: /*
464: * Unicast check
465: */
1.22 itojun 466: if (ip6_forward_rt.ro_rt != NULL &&
467: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
468: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35 itojun 469: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25 itojun 470: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 471: else {
1.35 itojun 472: struct sockaddr_in6 *dst6;
473:
1.2 itojun 474: if (ip6_forward_rt.ro_rt) {
1.22 itojun 475: /* route is down or destination is different */
1.25 itojun 476: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 477: RTFREE(ip6_forward_rt.ro_rt);
478: ip6_forward_rt.ro_rt = 0;
479: }
1.22 itojun 480:
1.2 itojun 481: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35 itojun 482: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
483: dst6->sin6_len = sizeof(struct sockaddr_in6);
484: dst6->sin6_family = AF_INET6;
485: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 486:
1.9 itojun 487: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 488: }
489:
490: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
491:
492: /*
493: * Accept the packet if the forwarding interface to the destination
494: * according to the routing table is the loopback interface,
495: * unless the associated route has a gateway.
496: * Note that this approach causes to accept a packet if there is a
497: * route to the loopback interface for the destination of the packet.
498: * But we think it's even useful in some situations, e.g. when using
499: * a special daemon which wants to intercept the packet.
500: */
501: if (ip6_forward_rt.ro_rt &&
502: (ip6_forward_rt.ro_rt->rt_flags &
503: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
504: #if 0
505: /*
506: * The check below is redundant since the comparison of
507: * the destination and the key of the rtentry has
508: * already done through looking up the routing table.
509: */
510: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
511: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
512: #endif
1.9 itojun 513: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 514: struct in6_ifaddr *ia6 =
515: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
516: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
517: m->m_flags |= M_ANYCAST6;
1.24 itojun 518: /*
519: * packets to a tentative, duplicated, or somehow invalid
520: * address must not be accepted.
521: */
1.2 itojun 522: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 523: /* this address is ready */
1.2 itojun 524: ours = 1;
1.9 itojun 525: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 526: goto hbhcheck;
527: } else {
1.24 itojun 528: /* address is not ready, so discard the packet. */
1.34 itojun 529: nd6log((LOG_INFO,
1.27 itojun 530: "ip6_input: packet to an unready address %s->%s\n",
1.24 itojun 531: ip6_sprintf(&ip6->ip6_src),
1.34 itojun 532: ip6_sprintf(&ip6->ip6_dst)));
1.24 itojun 533:
534: goto bad;
1.2 itojun 535: }
536: }
537:
538: /*
539: * FAITH(Firewall Aided Internet Translator)
540: */
541: #if defined(NFAITH) && 0 < NFAITH
542: if (ip6_keepfaith) {
543: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
544: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
545: /* XXX do we need more sanity checks? */
546: ours = 1;
1.45 itojun 547: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9 itojun 548: goto hbhcheck;
549: }
550: }
551: #endif
552:
553: #if 0
554: {
555: /*
556: * Last resort: check in6_ifaddr for incoming interface.
557: * The code is here until I update the "goto ours hack" code above
558: * working right.
559: */
560: struct ifaddr *ifa;
561: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
562: ifa;
563: ifa = ifa->ifa_list.tqe_next) {
564: if (ifa->ifa_addr == NULL)
565: continue; /* just for safety */
566: if (ifa->ifa_addr->sa_family != AF_INET6)
567: continue;
568: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
569: ours = 1;
570: deliverifp = ifa->ifa_ifp;
1.2 itojun 571: goto hbhcheck;
572: }
573: }
1.9 itojun 574: }
1.2 itojun 575: #endif
576:
577: /*
578: * Now there is no reason to process the packet if it's not our own
579: * and we're not a router.
580: */
581: if (!ip6_forwarding) {
582: ip6stat.ip6s_cantforward++;
1.9 itojun 583: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 584: goto bad;
585: }
586:
587: hbhcheck:
588: /*
589: * Process Hop-by-Hop options header if it's contained.
590: * m may be modified in ip6_hopopts_input().
591: * If a JumboPayload option is included, plen will also be modified.
592: */
593: plen = (u_int32_t)ntohs(ip6->ip6_plen);
594: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 595: struct ip6_hbh *hbh;
596:
597: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
598: #if 0 /*touches NULL pointer*/
599: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
600: #endif
1.2 itojun 601: return; /* m have already been freed */
1.9 itojun 602: }
1.22 itojun 603:
1.2 itojun 604: /* adjust pointer */
605: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 606:
607: /*
608: * if the payload length field is 0 and the next header field
609: * indicates Hop-by-Hop Options header, then a Jumbo Payload
610: * option MUST be included.
611: */
612: if (ip6->ip6_plen == 0 && plen == 0) {
613: /*
614: * Note that if a valid jumbo payload option is
615: * contained, ip6_hoptops_input() must set a valid
616: * (non-zero) payload length to the variable plen.
617: */
618: ip6stat.ip6s_badoptions++;
619: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
620: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
621: icmp6_error(m, ICMP6_PARAM_PROB,
622: ICMP6_PARAMPROB_HEADER,
623: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
624: return;
625: }
1.9 itojun 626: #ifndef PULLDOWN_TEST
627: /* ip6_hopopts_input() ensures that mbuf is contiguous */
628: hbh = (struct ip6_hbh *)(ip6 + 1);
629: #else
630: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
631: sizeof(struct ip6_hbh));
632: if (hbh == NULL) {
633: ip6stat.ip6s_tooshort++;
634: return;
635: }
636: #endif
637: nxt = hbh->ip6h_nxt;
1.2 itojun 638:
639: /*
640: * accept the packet if a router alert option is included
641: * and we act as an IPv6 router.
642: */
1.5 itojun 643: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 644: ours = 1;
645: } else
646: nxt = ip6->ip6_nxt;
647:
648: /*
649: * Check that the amount of data in the buffers
650: * is as at least much as the IPv6 header would have us expect.
651: * Trim mbufs if longer than we expect.
652: * Drop packet if shorter than we expect.
653: */
654: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
655: ip6stat.ip6s_tooshort++;
1.9 itojun 656: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 657: goto bad;
658: }
659: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
660: if (m->m_len == m->m_pkthdr.len) {
661: m->m_len = sizeof(struct ip6_hdr) + plen;
662: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
663: } else
664: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
665: }
666:
667: /*
668: * Forward if desirable.
669: */
670: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
671: /*
672: * If we are acting as a multicast router, all
673: * incoming multicast packets are passed to the
674: * kernel-level multicast forwarding function.
675: * The packet is returned (relatively) intact; if
676: * ip6_mforward() returns a non-zero value, the packet
677: * must be discarded, else it may be accepted below.
678: */
679: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
680: ip6stat.ip6s_cantforward++;
681: m_freem(m);
682: return;
683: }
684: if (!ours) {
685: m_freem(m);
686: return;
687: }
1.22 itojun 688: } else if (!ours) {
1.2 itojun 689: ip6_forward(m, 0);
690: return;
691: }
1.25 itojun 692:
693: ip6 = mtod(m, struct ip6_hdr *);
694:
695: /*
696: * Malicious party may be able to use IPv4 mapped addr to confuse
697: * tcp/udp stack and bypass security checks (act as if it was from
698: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
699: *
700: * For SIIT end node behavior, you may want to disable the check.
701: * However, you will become vulnerable to attacks using IPv4 mapped
702: * source.
703: */
704: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
705: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
706: ip6stat.ip6s_badscope++;
707: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
708: goto bad;
709: }
1.2 itojun 710:
711: /*
712: * Tell launch routine the next header
713: */
1.12 itojun 714: #ifdef IFA_STATS
1.28 itojun 715: if (deliverifp != NULL) {
1.9 itojun 716: struct in6_ifaddr *ia6;
717: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
718: if (ia6)
719: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
720: }
721: #endif
1.2 itojun 722: ip6stat.ip6s_delivered++;
1.9 itojun 723: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 724: nest = 0;
1.40 itojun 725:
1.2 itojun 726: while (nxt != IPPROTO_DONE) {
727: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
728: ip6stat.ip6s_toomanyhdr++;
729: goto bad;
730: }
1.8 itojun 731:
732: /*
733: * protection against faulty packet - there should be
734: * more sanity checks in header chain processing.
735: */
736: if (m->m_pkthdr.len < off) {
737: ip6stat.ip6s_tooshort++;
1.9 itojun 738: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 739: goto bad;
740: }
741:
1.37 itojun 742: #ifdef IPSEC
743: /*
744: * enforce IPsec policy checking if we are seeing last header.
745: * note that we do not visit this with protocols with pcb layer
746: * code - like udp/tcp/raw ip.
747: */
748: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
749: ipsec6_in_reject(m, NULL)) {
750: ipsec6stat.in_polvio++;
751: goto bad;
752: }
753: #endif
754:
1.2 itojun 755: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
756: }
757: return;
758: bad:
759: m_freem(m);
760: }
761:
762: /*
763: * Hop-by-Hop options header processing. If a valid jumbo payload option is
764: * included, the real payload length will be stored in plenp.
765: */
766: static int
767: ip6_hopopts_input(plenp, rtalertp, mp, offp)
768: u_int32_t *plenp;
1.5 itojun 769: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 770: struct mbuf **mp;
771: int *offp;
772: {
1.35 itojun 773: struct mbuf *m = *mp;
1.2 itojun 774: int off = *offp, hbhlen;
775: struct ip6_hbh *hbh;
776: u_int8_t *opt;
777:
778: /* validation of the length of the header */
1.9 itojun 779: #ifndef PULLDOWN_TEST
1.2 itojun 780: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
781: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
782: hbhlen = (hbh->ip6h_len + 1) << 3;
783:
784: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
785: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 786: #else
787: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
788: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
789: if (hbh == NULL) {
790: ip6stat.ip6s_tooshort++;
791: return -1;
792: }
793: hbhlen = (hbh->ip6h_len + 1) << 3;
794: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
795: hbhlen);
796: if (hbh == NULL) {
797: ip6stat.ip6s_tooshort++;
798: return -1;
799: }
800: #endif
1.2 itojun 801: off += hbhlen;
802: hbhlen -= sizeof(struct ip6_hbh);
803: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
804:
805: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
806: hbhlen, rtalertp, plenp) < 0)
807: return(-1);
808:
809: *offp = off;
810: *mp = m;
811: return(0);
812: }
813:
814: /*
815: * Search header for all Hop-by-hop options and process each option.
816: * This function is separate from ip6_hopopts_input() in order to
817: * handle a case where the sending node itself process its hop-by-hop
818: * options header. In such a case, the function is called from ip6_output().
819: */
820: int
821: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
822: struct mbuf *m;
823: u_int8_t *opthead;
824: int hbhlen;
1.5 itojun 825: u_int32_t *rtalertp;
1.2 itojun 826: u_int32_t *plenp;
827: {
828: struct ip6_hdr *ip6;
829: int optlen = 0;
830: u_int8_t *opt = opthead;
831: u_int16_t rtalert_val;
1.22 itojun 832: u_int32_t jumboplen;
1.2 itojun 833:
834: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35 itojun 835: switch (*opt) {
836: case IP6OPT_PAD1:
837: optlen = 1;
838: break;
839: case IP6OPT_PADN:
840: if (hbhlen < IP6OPT_MINLEN) {
841: ip6stat.ip6s_toosmall++;
842: goto bad;
843: }
844: optlen = *(opt + 1) + 2;
845: break;
846: case IP6OPT_RTALERT:
847: /* XXX may need check for alignment */
848: if (hbhlen < IP6OPT_RTALERT_LEN) {
849: ip6stat.ip6s_toosmall++;
850: goto bad;
851: }
852: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
853: /* XXX: should we discard the packet? */
854: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
855: *(opt + 1));
856: }
857: optlen = IP6OPT_RTALERT_LEN;
858: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
859: *rtalertp = ntohs(rtalert_val);
860: break;
861: case IP6OPT_JUMBO:
1.22 itojun 862: /* XXX may need check for alignment */
863: if (hbhlen < IP6OPT_JUMBO_LEN) {
864: ip6stat.ip6s_toosmall++;
865: goto bad;
866: }
1.35 itojun 867: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
868: /* XXX: should we discard the packet? */
1.22 itojun 869: log(LOG_ERR, "length of jumbopayload opt "
1.27 itojun 870: "is inconsistent(%d)\n",
1.22 itojun 871: *(opt + 1));
1.35 itojun 872: }
1.22 itojun 873: optlen = IP6OPT_JUMBO_LEN;
874:
875: /*
876: * IPv6 packets that have non 0 payload length
1.35 itojun 877: * must not contain a jumbo payload option.
1.22 itojun 878: */
879: ip6 = mtod(m, struct ip6_hdr *);
880: if (ip6->ip6_plen) {
881: ip6stat.ip6s_badoptions++;
882: icmp6_error(m, ICMP6_PARAM_PROB,
883: ICMP6_PARAMPROB_HEADER,
884: sizeof(struct ip6_hdr) +
885: sizeof(struct ip6_hbh) +
886: opt - opthead);
887: return(-1);
888: }
1.2 itojun 889:
1.22 itojun 890: /*
891: * We may see jumbolen in unaligned location, so
892: * we'd need to perform bcopy().
893: */
894: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
895: jumboplen = (u_int32_t)htonl(jumboplen);
896:
897: #if 1
898: /*
899: * if there are multiple jumbo payload options,
900: * *plenp will be non-zero and the packet will be
901: * rejected.
902: * the behavior may need some debate in ipngwg -
903: * multiple options does not make sense, however,
904: * there's no explicit mention in specification.
905: */
906: if (*plenp != 0) {
907: ip6stat.ip6s_badoptions++;
908: icmp6_error(m, ICMP6_PARAM_PROB,
909: ICMP6_PARAMPROB_HEADER,
910: sizeof(struct ip6_hdr) +
911: sizeof(struct ip6_hbh) +
912: opt + 2 - opthead);
913: return(-1);
914: }
1.8 itojun 915: #endif
1.2 itojun 916:
1.22 itojun 917: /*
918: * jumbo payload length must be larger than 65535.
919: */
920: if (jumboplen <= IPV6_MAXPACKET) {
921: ip6stat.ip6s_badoptions++;
922: icmp6_error(m, ICMP6_PARAM_PROB,
923: ICMP6_PARAMPROB_HEADER,
924: sizeof(struct ip6_hdr) +
925: sizeof(struct ip6_hbh) +
926: opt + 2 - opthead);
927: return(-1);
928: }
929: *plenp = jumboplen;
930:
931: break;
1.35 itojun 932: default: /* unknown option */
933: if (hbhlen < IP6OPT_MINLEN) {
934: ip6stat.ip6s_toosmall++;
935: goto bad;
936: }
937: if ((optlen = ip6_unknown_opt(opt, m,
938: sizeof(struct ip6_hdr) +
939: sizeof(struct ip6_hbh) +
940: opt - opthead)) == -1)
941: return(-1);
942: optlen += 2;
943: break;
1.2 itojun 944: }
945: }
946:
947: return(0);
948:
949: bad:
950: m_freem(m);
951: return(-1);
952: }
953:
954: /*
955: * Unknown option processing.
956: * The third argument `off' is the offset from the IPv6 header to the option,
957: * which is necessary if the IPv6 header the and option header and IPv6 header
958: * is not continuous in order to return an ICMPv6 error.
959: */
960: int
961: ip6_unknown_opt(optp, m, off)
962: u_int8_t *optp;
963: struct mbuf *m;
964: int off;
965: {
966: struct ip6_hdr *ip6;
967:
1.35 itojun 968: switch (IP6OPT_TYPE(*optp)) {
969: case IP6OPT_TYPE_SKIP: /* ignore the option */
970: return((int)*(optp + 1));
971: case IP6OPT_TYPE_DISCARD: /* silently discard */
972: m_freem(m);
973: return(-1);
974: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
975: ip6stat.ip6s_badoptions++;
976: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
977: return(-1);
978: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
979: ip6stat.ip6s_badoptions++;
980: ip6 = mtod(m, struct ip6_hdr *);
981: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
982: (m->m_flags & (M_BCAST|M_MCAST)))
983: m_freem(m);
984: else
985: icmp6_error(m, ICMP6_PARAM_PROB,
986: ICMP6_PARAMPROB_OPTION, off);
987: return(-1);
1.2 itojun 988: }
989:
990: m_freem(m); /* XXX: NOTREACHED */
991: return(-1);
992: }
993:
994: /*
1.9 itojun 995: * Create the "control" list for this pcb.
996: *
997: * The routine will be called from upper layer handlers like tcp6_input().
998: * Thus the routine assumes that the caller (tcp6_input) have already
999: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1000: * very first mbuf on the mbuf chain.
1001: * We may want to add some infinite loop prevention or sanity checks for safety.
1002: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1003: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1004: */
1005: void
1006: ip6_savecontrol(in6p, mp, ip6, m)
1.35 itojun 1007: struct in6pcb *in6p;
1008: struct mbuf **mp;
1009: struct ip6_hdr *ip6;
1010: struct mbuf *m;
1.2 itojun 1011: {
1012: struct proc *p = curproc; /* XXX */
1.9 itojun 1013: int privileged;
1.2 itojun 1014:
1.9 itojun 1015: privileged = 0;
1016: if (p && !suser(p->p_ucred, &p->p_acflag))
1017: privileged++;
1018:
1019: #ifdef SO_TIMESTAMP
1.2 itojun 1020: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1021: struct timeval tv;
1022:
1023: microtime(&tv);
1024: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1025: SCM_TIMESTAMP, SOL_SOCKET);
1026: if (*mp)
1027: mp = &(*mp)->m_next;
1028: }
1.9 itojun 1029: #endif
1.2 itojun 1030: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1031: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1032: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1033: IPPROTO_IPV6);
1034: if (*mp)
1035: mp = &(*mp)->m_next;
1036: }
1037:
1038: #ifdef noyet
1039: /* options were tossed above */
1040: if (in6p->in6p_flags & IN6P_RECVOPTS)
1041: /* broken */
1042: /* ip6_srcroute doesn't do what we want here, need to fix */
1043: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1044: /* broken */
1045: #endif
1046:
1047: /* RFC 2292 sec. 5 */
1.35 itojun 1048: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1049: struct in6_pktinfo pi6;
1050: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1051: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1052: pi6.ipi6_addr.s6_addr16[1] = 0;
1053: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1054: ? m->m_pkthdr.rcvif->if_index
1055: : 0;
1056: *mp = sbcreatecontrol((caddr_t) &pi6,
1057: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1058: IPPROTO_IPV6);
1059: if (*mp)
1060: mp = &(*mp)->m_next;
1061: }
1062: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1063: int hlim = ip6->ip6_hlim & 0xff;
1064: *mp = sbcreatecontrol((caddr_t) &hlim,
1065: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1066: if (*mp)
1067: mp = &(*mp)->m_next;
1068: }
1069: /* IN6P_NEXTHOP - for outgoing packet only */
1070:
1071: /*
1072: * IPV6_HOPOPTS socket option. We require super-user privilege
1073: * for the option, but it might be too strict, since there might
1074: * be some hop-by-hop options which can be returned to normal user.
1075: * See RFC 2292 section 6.
1076: */
1.35 itojun 1077: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1078: /*
1079: * Check if a hop-by-hop options header is contatined in the
1080: * received packet, and if so, store the options as ancillary
1081: * data. Note that a hop-by-hop options header must be
1082: * just after the IPv6 header, which fact is assured through
1083: * the IPv6 input processing.
1084: */
1085: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1086: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1087: struct ip6_hbh *hbh;
1088: int hbhlen;
1089:
1090: #ifndef PULLDOWN_TEST
1091: hbh = (struct ip6_hbh *)(ip6 + 1);
1092: hbhlen = (hbh->ip6h_len + 1) << 3;
1093: #else
1094: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1095: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1096: if (hbh == NULL) {
1097: ip6stat.ip6s_tooshort++;
1098: return;
1099: }
1100: hbhlen = (hbh->ip6h_len + 1) << 3;
1101: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1102: sizeof(struct ip6_hdr), hbhlen);
1103: if (hbh == NULL) {
1104: ip6stat.ip6s_tooshort++;
1105: return;
1106: }
1107: #endif
1.2 itojun 1108:
1109: /*
1110: * XXX: We copy whole the header even if a jumbo
1111: * payload option is included, which option is to
1112: * be removed before returning in the RFC 2292.
1113: * But it's too painful operation...
1114: */
1.9 itojun 1115: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1116: IPV6_HOPOPTS, IPPROTO_IPV6);
1117: if (*mp)
1118: mp = &(*mp)->m_next;
1119: }
1120: }
1121:
1122: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1123: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1124: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1125: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1126:
1127: /*
1128: * Search for destination options headers or routing
1129: * header(s) through the header chain, and stores each
1130: * header as ancillary data.
1131: * Note that the order of the headers remains in
1132: * the chain of ancillary data.
1133: */
1.35 itojun 1134: while (1) { /* is explicit loop prevention necessary? */
1.9 itojun 1135: struct ip6_ext *ip6e;
1136: int elen;
1137:
1138: #ifndef PULLDOWN_TEST
1139: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1140: if (nxt == IPPROTO_AH)
1141: elen = (ip6e->ip6e_len + 2) << 2;
1142: else
1143: elen = (ip6e->ip6e_len + 1) << 3;
1144: #else
1145: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1146: sizeof(struct ip6_ext));
1147: if (ip6e == NULL) {
1148: ip6stat.ip6s_tooshort++;
1149: return;
1150: }
1151: if (nxt == IPPROTO_AH)
1152: elen = (ip6e->ip6e_len + 2) << 2;
1153: else
1154: elen = (ip6e->ip6e_len + 1) << 3;
1155: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1156: if (ip6e == NULL) {
1157: ip6stat.ip6s_tooshort++;
1158: return;
1159: }
1160: #endif
1.2 itojun 1161:
1.35 itojun 1162: switch (nxt) {
1163: case IPPROTO_DSTOPTS:
1164: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1165: break;
1166:
1167: /*
1168: * We also require super-user privilege for
1169: * the option.
1170: * See the comments on IN6_HOPOPTS.
1171: */
1172: if (!privileged)
1173: break;
1174:
1175: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1176: IPV6_DSTOPTS,
1177: IPPROTO_IPV6);
1178: if (*mp)
1179: mp = &(*mp)->m_next;
1180: break;
1181:
1182: case IPPROTO_ROUTING:
1183: if (!in6p->in6p_flags & IN6P_RTHDR)
1184: break;
1185:
1186: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1187: IPV6_RTHDR,
1188: IPPROTO_IPV6);
1189: if (*mp)
1190: mp = &(*mp)->m_next;
1191: break;
1192:
1193: case IPPROTO_UDP:
1194: case IPPROTO_TCP:
1195: case IPPROTO_ICMPV6:
1196: default:
1197: /*
1198: * stop search if we encounter an upper
1199: * layer protocol headers.
1200: */
1201: goto loopend;
1202:
1203: case IPPROTO_HOPOPTS:
1204: case IPPROTO_AH: /* is it possible? */
1205: break;
1.2 itojun 1206: }
1207:
1208: /* proceed with the next header. */
1.9 itojun 1209: off += elen;
1.2 itojun 1210: nxt = ip6e->ip6e_nxt;
1211: }
1212: loopend:
1.36 cgd 1213: ;
1.2 itojun 1214: }
1.9 itojun 1215: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1216: /* to be done */
1217: }
1.9 itojun 1218: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1219: /* to be done */
1220: }
1221: /* IN6P_RTHDR - to be done */
1222:
1223: }
1224:
1225: /*
1226: * Get pointer to the previous header followed by the header
1227: * currently processed.
1228: * XXX: This function supposes that
1229: * M includes all headers,
1230: * the next header field and the header length field of each header
1231: * are valid, and
1232: * the sum of each header length equals to OFF.
1233: * Because of these assumptions, this function must be called very
1234: * carefully. Moreover, it will not be used in the near future when
1235: * we develop `neater' mechanism to process extension headers.
1236: */
1237: char *
1238: ip6_get_prevhdr(m, off)
1239: struct mbuf *m;
1240: int off;
1241: {
1242: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1243:
1244: if (off == sizeof(struct ip6_hdr))
1245: return(&ip6->ip6_nxt);
1246: else {
1247: int len, nxt;
1248: struct ip6_ext *ip6e = NULL;
1249:
1250: nxt = ip6->ip6_nxt;
1251: len = sizeof(struct ip6_hdr);
1252: while (len < off) {
1253: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1254:
1.35 itojun 1255: switch (nxt) {
1.2 itojun 1256: case IPPROTO_FRAGMENT:
1257: len += sizeof(struct ip6_frag);
1258: break;
1259: case IPPROTO_AH:
1260: len += (ip6e->ip6e_len + 2) << 2;
1261: break;
1262: default:
1263: len += (ip6e->ip6e_len + 1) << 3;
1264: break;
1265: }
1266: nxt = ip6e->ip6e_nxt;
1267: }
1268: if (ip6e)
1269: return(&ip6e->ip6e_nxt);
1270: else
1271: return NULL;
1.18 itojun 1272: }
1273: }
1274:
1275: /*
1276: * get next header offset. m will be retained.
1277: */
1278: int
1279: ip6_nexthdr(m, off, proto, nxtp)
1280: struct mbuf *m;
1281: int off;
1282: int proto;
1283: int *nxtp;
1284: {
1285: struct ip6_hdr ip6;
1286: struct ip6_ext ip6e;
1287: struct ip6_frag fh;
1288:
1289: /* just in case */
1290: if (m == NULL)
1291: panic("ip6_nexthdr: m == NULL");
1292: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1293: return -1;
1294:
1295: switch (proto) {
1296: case IPPROTO_IPV6:
1297: if (m->m_pkthdr.len < off + sizeof(ip6))
1298: return -1;
1299: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1300: if (nxtp)
1301: *nxtp = ip6.ip6_nxt;
1302: off += sizeof(ip6);
1303: return off;
1304:
1305: case IPPROTO_FRAGMENT:
1306: /*
1307: * terminate parsing if it is not the first fragment,
1308: * it does not make sense to parse through it.
1309: */
1310: if (m->m_pkthdr.len < off + sizeof(fh))
1311: return -1;
1312: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1313: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1314: return -1;
1315: if (nxtp)
1316: *nxtp = fh.ip6f_nxt;
1317: off += sizeof(struct ip6_frag);
1318: return off;
1319:
1320: case IPPROTO_AH:
1321: if (m->m_pkthdr.len < off + sizeof(ip6e))
1322: return -1;
1323: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1324: if (nxtp)
1325: *nxtp = ip6e.ip6e_nxt;
1326: off += (ip6e.ip6e_len + 2) << 2;
1.47 itojun 1327: if (m->m_pkthdr.len < off)
1328: return -1;
1.18 itojun 1329: return off;
1330:
1331: case IPPROTO_HOPOPTS:
1332: case IPPROTO_ROUTING:
1333: case IPPROTO_DSTOPTS:
1334: if (m->m_pkthdr.len < off + sizeof(ip6e))
1335: return -1;
1336: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1337: if (nxtp)
1338: *nxtp = ip6e.ip6e_nxt;
1339: off += (ip6e.ip6e_len + 1) << 3;
1.47 itojun 1340: if (m->m_pkthdr.len < off)
1341: return -1;
1.18 itojun 1342: return off;
1343:
1344: case IPPROTO_NONE:
1345: case IPPROTO_ESP:
1346: case IPPROTO_IPCOMP:
1347: /* give up */
1348: return -1;
1349:
1350: default:
1351: return -1;
1352: }
1353:
1354: return -1;
1355: }
1356:
1357: /*
1358: * get offset for the last header in the chain. m will be kept untainted.
1359: */
1360: int
1361: ip6_lasthdr(m, off, proto, nxtp)
1362: struct mbuf *m;
1363: int off;
1364: int proto;
1365: int *nxtp;
1366: {
1367: int newoff;
1368: int nxt;
1369:
1370: if (!nxtp) {
1371: nxt = -1;
1372: nxtp = &nxt;
1373: }
1374: while (1) {
1375: newoff = ip6_nexthdr(m, off, proto, nxtp);
1376: if (newoff < 0)
1377: return off;
1378: else if (newoff < off)
1379: return -1; /* invalid */
1380: else if (newoff == off)
1381: return newoff;
1382:
1383: off = newoff;
1384: proto = *nxtp;
1.2 itojun 1385: }
1386: }
1387:
1388: /*
1389: * System control for IP6
1390: */
1391:
1392: u_char inet6ctlerrmap[PRC_NCMDS] = {
1393: 0, 0, 0, 0,
1394: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1395: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1396: EMSGSIZE, EHOSTUNREACH, 0, 0,
1397: 0, 0, 0, 0,
1398: ENOPROTOOPT
1399: };
1400:
1401: int
1402: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1403: int *name;
1404: u_int namelen;
1405: void *oldp;
1406: size_t *oldlenp;
1407: void *newp;
1408: size_t newlen;
1409: {
1.26 itojun 1410: int old, error;
1411:
1.2 itojun 1412: /* All sysctl names at this level are terminal. */
1413: if (namelen != 1)
1414: return ENOTDIR;
1415:
1416: switch (name[0]) {
1417:
1418: case IPV6CTL_FORWARDING:
1419: return sysctl_int(oldp, oldlenp, newp, newlen,
1420: &ip6_forwarding);
1421: case IPV6CTL_SENDREDIRECTS:
1422: return sysctl_int(oldp, oldlenp, newp, newlen,
1423: &ip6_sendredirects);
1424: case IPV6CTL_DEFHLIM:
1425: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1426: case IPV6CTL_MAXFRAGPACKETS:
1427: return sysctl_int(oldp, oldlenp, newp, newlen,
1428: &ip6_maxfragpackets);
1429: case IPV6CTL_ACCEPT_RTADV:
1430: return sysctl_int(oldp, oldlenp, newp, newlen,
1431: &ip6_accept_rtadv);
1432: case IPV6CTL_KEEPFAITH:
1433: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1434: case IPV6CTL_LOG_INTERVAL:
1435: return sysctl_int(oldp, oldlenp, newp, newlen,
1436: &ip6_log_interval);
1437: case IPV6CTL_HDRNESTLIMIT:
1438: return sysctl_int(oldp, oldlenp, newp, newlen,
1439: &ip6_hdrnestlimit);
1440: case IPV6CTL_DAD_COUNT:
1441: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1442: case IPV6CTL_AUTO_FLOWLABEL:
1443: return sysctl_int(oldp, oldlenp, newp, newlen,
1444: &ip6_auto_flowlabel);
1445: case IPV6CTL_DEFMCASTHLIM:
1446: return sysctl_int(oldp, oldlenp, newp, newlen,
1447: &ip6_defmcasthlim);
1448: case IPV6CTL_GIF_HLIM:
1449: return sysctl_int(oldp, oldlenp, newp, newlen,
1450: &ip6_gif_hlim);
1451: case IPV6CTL_KAME_VERSION:
1452: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1453: case IPV6CTL_USE_DEPRECATED:
1454: return sysctl_int(oldp, oldlenp, newp, newlen,
1455: &ip6_use_deprecated);
1.10 itojun 1456: case IPV6CTL_RR_PRUNE:
1457: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43 itojun 1458: case IPV6CTL_V6ONLY:
1459: #ifdef INET6_BINDV6ONLY
1460: return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
1461: #else
1462: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26 itojun 1463: #endif
1464: case IPV6CTL_ANONPORTMIN:
1465: old = ip6_anonportmin;
1466: error = sysctl_int(oldp, oldlenp, newp, newlen,
1467: &ip6_anonportmin);
1468: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1469: ip6_anonportmin > 65535
1470: #ifndef IPNOPRIVPORTS
1471: || ip6_anonportmin < IPV6PORT_RESERVED
1472: #endif
1473: ) {
1474: ip6_anonportmin = old;
1475: return (EINVAL);
1476: }
1477: return (error);
1478: case IPV6CTL_ANONPORTMAX:
1479: old = ip6_anonportmax;
1480: error = sysctl_int(oldp, oldlenp, newp, newlen,
1481: &ip6_anonportmax);
1482: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1483: ip6_anonportmax > 65535
1484: #ifndef IPNOPRIVPORTS
1485: || ip6_anonportmax < IPV6PORT_RESERVED
1486: #endif
1487: ) {
1488: ip6_anonportmax = old;
1489: return (EINVAL);
1490: }
1491: return (error);
1492: #ifndef IPNOPRIVPORTS
1493: case IPV6CTL_LOWPORTMIN:
1494: old = ip6_lowportmin;
1495: error = sysctl_int(oldp, oldlenp, newp, newlen,
1496: &ip6_lowportmin);
1497: if (ip6_lowportmin >= ip6_lowportmax ||
1498: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1499: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1500: ip6_lowportmin = old;
1501: return (EINVAL);
1502: }
1503: return (error);
1504: case IPV6CTL_LOWPORTMAX:
1505: old = ip6_lowportmax;
1506: error = sysctl_int(oldp, oldlenp, newp, newlen,
1507: &ip6_lowportmax);
1508: if (ip6_lowportmin >= ip6_lowportmax ||
1509: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1510: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1511: ip6_lowportmax = old;
1512: return (EINVAL);
1513: }
1514: return (error);
1.11 itojun 1515: #endif
1.2 itojun 1516: default:
1517: return EOPNOTSUPP;
1518: }
1519: /* NOTREACHED */
1520: }
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