Annotation of src/sys/netinet6/ip6_input.c, Revision 1.22.2.6
1.22.2.6! jmc 1: /* $NetBSD: ip6_input.c,v 1.22.2.5 2002/02/26 20:14:36 he Exp $ */
1.22.2.2 itojun 2: /* $KAME: ip6_input.c,v 1.119 2000/08/26 10:00:45 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:
68: #include "opt_inet.h"
1.4 thorpej 69: #include "opt_ipsec.h"
1.15 darrenr 70: #include "opt_pfil_hooks.h"
1.2 itojun 71:
72: #include <sys/param.h>
73: #include <sys/systm.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/domain.h>
77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
80: #include <sys/errno.h>
81: #include <sys/time.h>
82: #include <sys/kernel.h>
83: #include <sys/syslog.h>
84: #include <sys/proc.h>
85:
86: #include <net/if.h>
87: #include <net/if_types.h>
88: #include <net/if_dl.h>
89: #include <net/route.h>
90: #include <net/netisr.h>
1.15 darrenr 91: #ifdef PFIL_HOOKS
92: #include <net/pfil.h>
93: #endif
1.2 itojun 94:
95: #include <netinet/in.h>
1.9 itojun 96: #include <netinet/in_systm.h>
97: #ifdef INET
98: #include <netinet/ip.h>
99: #include <netinet/ip_icmp.h>
100: #endif /*INET*/
1.14 itojun 101: #include <netinet/ip6.h>
1.2 itojun 102: #include <netinet6/in6_var.h>
1.11 itojun 103: #include <netinet6/ip6_var.h>
1.2 itojun 104: #include <netinet6/in6_pcb.h>
1.14 itojun 105: #include <netinet/icmp6.h>
1.2 itojun 106: #include <netinet6/in6_ifattach.h>
107: #include <netinet6/nd6.h>
1.9 itojun 108: #include <netinet6/in6_prefix.h>
1.2 itojun 109:
1.9 itojun 110: #ifdef IPV6FIREWALL
111: #include <netinet6/ip6_fw.h>
112: #endif
1.2 itojun 113:
1.22.2.3 he 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:
124: #include "gif.h"
125: #include "bpfilter.h"
126:
1.9 itojun 127: #include <net/net_osdep.h>
128:
1.2 itojun 129: extern struct domain inet6domain;
130:
131: u_char ip6_protox[IPPROTO_MAX];
132: static int ip6qmaxlen = IFQ_MAXLEN;
133: struct in6_ifaddr *in6_ifaddr;
134: struct ifqueue ip6intrq;
135:
136: extern struct ifnet loif[NLOOP];
137: int ip6_forward_srcrt; /* XXX */
138: int ip6_sourcecheck; /* XXX */
139: int ip6_sourcecheck_interval; /* XXX */
1.9 itojun 140:
141: #ifdef IPV6FIREWALL
142: /* firewall hooks */
143: ip6_fw_chk_t *ip6_fw_chk_ptr;
144: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2 itojun 145: #endif
146:
147: struct ip6stat ip6stat;
148:
149: static void ip6_init2 __P((void *));
150:
1.5 itojun 151: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 152:
153: /*
154: * IP6 initialization: fill in IP6 protocol switch table.
155: * All protocols not implemented in kernel go to raw IP6 protocol handler.
156: */
157: void
158: ip6_init()
159: {
160: register struct ip6protosw *pr;
161: register int i;
162: struct timeval tv;
163:
164: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
165: if (pr == 0)
166: panic("ip6_init");
167: for (i = 0; i < IPPROTO_MAX; i++)
168: ip6_protox[i] = pr - inet6sw;
169: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
170: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
171: if (pr->pr_domain->dom_family == PF_INET6 &&
172: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
173: ip6_protox[pr->pr_protocol] = pr - inet6sw;
174: ip6intrq.ifq_maxlen = ip6qmaxlen;
175: nd6_init();
176: frag6_init();
1.9 itojun 177: #ifdef IPV6FIREWALL
178: ip6_fw_init();
179: #endif
1.2 itojun 180: /*
181: * in many cases, random() here does NOT return random number
182: * as initialization during bootstrap time occur in fixed order.
183: */
184: microtime(&tv);
185: ip6_flow_seq = random() ^ tv.tv_usec;
186:
187: ip6_init2((void *)0);
188: }
189:
190: static void
191: ip6_init2(dummy)
192: void *dummy;
193: {
194: /*
195: * to route local address of p2p link to loopback,
1.21 itojun 196: * assign loopback address first.
1.2 itojun 197: */
1.20 itojun 198: in6_ifattach(&loif[0], NULL);
1.2 itojun 199:
200: /* nd6_timer_init */
1.19 thorpej 201: callout_init(&nd6_timer_ch);
202: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 203: /* router renumbering prefix list maintenance */
1.19 thorpej 204: callout_init(&in6_rr_timer_ch);
205: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 206: }
207:
208: /*
209: * IP6 input interrupt handling. Just pass the packet to ip6_input.
210: */
211: void
212: ip6intr()
213: {
214: int s;
215: struct mbuf *m;
216:
217: for (;;) {
218: s = splimp();
219: IF_DEQUEUE(&ip6intrq, m);
220: splx(s);
221: if (m == 0)
222: return;
223: ip6_input(m);
224: }
225: }
226:
227: extern struct route_in6 ip6_forward_rt;
228:
229: void
230: ip6_input(m)
231: struct mbuf *m;
232: {
1.9 itojun 233: struct ip6_hdr *ip6;
1.2 itojun 234: int off = sizeof(struct ip6_hdr), nest;
235: u_int32_t plen;
1.5 itojun 236: u_int32_t rtalert = ~0;
1.2 itojun 237: int nxt, ours = 0;
1.9 itojun 238: struct ifnet *deliverifp = NULL;
1.15 darrenr 239: #ifdef PFIL_HOOKS
240: struct packet_filter_hook *pfh;
241: struct mbuf *m0;
242: int rv;
243: #endif /* PFIL_HOOKS */
1.2 itojun 244:
245: #ifdef IPSEC
246: /*
247: * should the inner packet be considered authentic?
248: * see comment in ah4_input().
249: */
250: if (m) {
251: m->m_flags &= ~M_AUTHIPHDR;
252: m->m_flags &= ~M_AUTHIPDGM;
253: }
254: #endif
1.9 itojun 255:
1.2 itojun 256: /*
257: * mbuf statistics by kazu
258: */
259: if (m->m_flags & M_EXT) {
260: if (m->m_next)
261: ip6stat.ip6s_mext2m++;
262: else
263: ip6stat.ip6s_mext1++;
264: } else {
265: if (m->m_next) {
1.9 itojun 266: if (m->m_flags & M_LOOP) {
1.2 itojun 267: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.22 itojun 268: } else if (m->m_pkthdr.rcvif->if_index <= 31)
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++;
274: }
275:
1.9 itojun 276: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
277: ip6stat.ip6s_total++;
278:
279: #ifndef PULLDOWN_TEST
280: /* XXX is the line really necessary? */
1.2 itojun 281: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 282: #endif
1.2 itojun 283:
1.9 itojun 284: if (m->m_len < sizeof(struct ip6_hdr)) {
285: struct ifnet *inifp;
286: inifp = m->m_pkthdr.rcvif;
287: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
288: ip6stat.ip6s_toosmall++;
289: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
290: return;
291: }
1.2 itojun 292: }
293:
294: ip6 = mtod(m, struct ip6_hdr *);
295:
296: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
297: ip6stat.ip6s_badvers++;
1.9 itojun 298: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 299: goto bad;
300: }
1.15 darrenr 301:
302: #ifdef PFIL_HOOKS
303: /*
304: * Run through list of hooks for input packets. If there are any
305: * filters which require that additional packets in the flow are
306: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
307: * Note that filters must _never_ set this flag, as another filter
308: * in the list may have previously cleared it.
309: */
310: m0 = m;
1.22.2.4 he 311: #ifdef IPSEC
312: if (ipsec_gethist(m, NULL))
313: pfh = NULL;
314: else
315: pfh = pfil_hook_get(PFIL_IN,
1.22.2.5 he 316: &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh);
1.22.2.4 he 317: #else
1.22.2.5 he 318: pfh = pfil_hook_get(PFIL_IN, &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh);
1.22.2.4 he 319: #endif
1.15 darrenr 320: for (; pfh; pfh = pfh->pfil_link.tqe_next)
321: if (pfh->pfil_func) {
322: rv = pfh->pfil_func(ip6, sizeof(*ip6),
323: m->m_pkthdr.rcvif, 0, &m0);
324: if (rv)
325: return;
326: m = m0;
327: if (m == NULL)
328: return;
329: ip6 = mtod(m, struct ip6_hdr *);
330: }
331: #endif /* PFIL_HOOKS */
332:
1.2 itojun 333:
334: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
335:
1.9 itojun 336: #ifdef IPV6FIREWALL
337: /*
338: * Check with the firewall...
339: */
340: if (ip6_fw_chk_ptr) {
341: u_short port = 0;
342: /* If ipfw says divert, we have to just drop packet */
343: /* use port as a dummy argument */
344: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
345: m_freem(m);
346: m = NULL;
347: }
348: if (!m)
349: return;
350: }
351: #endif
352:
1.2 itojun 353: /*
354: * Scope check
355: */
356: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
357: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
358: ip6stat.ip6s_badscope++;
1.9 itojun 359: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 360: goto bad;
361: }
1.13 itojun 362: /*
363: * The following check is not documented in the spec. Malicious party
364: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
365: * bypass security checks (act as if it was from 127.0.0.1 by using
366: * IPv6 src ::ffff:127.0.0.1). Be cautious.
367: */
368: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
369: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
370: ip6stat.ip6s_badscope++;
371: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
372: goto bad;
373: }
1.17 itojun 374: #if 0
1.13 itojun 375: /*
1.17 itojun 376: * Reject packets with IPv4 compatible addresses (auto tunnel).
377: *
378: * The code forbids auto tunnel relay case in RFC1933 (the check is
379: * stronger than RFC1933). We may want to re-enable it if mech-xx
380: * is revised to forbid relaying case.
1.13 itojun 381: */
382: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
383: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
384: ip6stat.ip6s_badscope++;
385: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
386: goto bad;
387: }
388: #endif
1.2 itojun 389: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
390: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
391: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
392: ours = 1;
1.9 itojun 393: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 394: goto hbhcheck;
395: } else {
396: ip6stat.ip6s_badscope++;
1.9 itojun 397: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 398: goto bad;
399: }
400: }
401:
1.21 itojun 402: #ifndef FAKE_LOOPBACK_IF
403: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
404: #else
405: if (1)
406: #endif
407: {
1.2 itojun 408: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
409: ip6->ip6_src.s6_addr16[1]
410: = htons(m->m_pkthdr.rcvif->if_index);
411: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
412: ip6->ip6_dst.s6_addr16[1]
413: = htons(m->m_pkthdr.rcvif->if_index);
414: }
415:
1.9 itojun 416: /*
1.21 itojun 417: * XXX we need this since we do not have "goto ours" hack route
418: * for some of our ifaddrs on loopback interface.
419: * we should correct it by changing in6_ifattach to install
420: * "goto ours" hack route.
1.9 itojun 421: */
1.21 itojun 422: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
423: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
424: ours = 1;
425: deliverifp = m->m_pkthdr.rcvif;
426: goto hbhcheck;
427: }
1.9 itojun 428: }
429:
1.2 itojun 430: /*
431: * Multicast check
432: */
433: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
434: struct in6_multi *in6m = 0;
1.9 itojun 435:
436: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 437: /*
438: * See if we belong to the destination multicast group on the
439: * arrival interface.
440: */
441: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
442: if (in6m)
443: ours = 1;
444: else if (!ip6_mrouter) {
445: ip6stat.ip6s_notmember++;
446: ip6stat.ip6s_cantforward++;
1.9 itojun 447: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 448: goto bad;
449: }
1.9 itojun 450: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 451: goto hbhcheck;
452: }
453:
454: /*
455: * Unicast check
456: */
1.22 itojun 457: if (ip6_forward_rt.ro_rt != NULL &&
458: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
459: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
460: &ip6_forward_rt.ro_dst.sin6_addr))
461: ; /* cache hit */
462: else {
1.2 itojun 463: if (ip6_forward_rt.ro_rt) {
1.22 itojun 464: /* route is down or destination is different */
1.2 itojun 465: RTFREE(ip6_forward_rt.ro_rt);
466: ip6_forward_rt.ro_rt = 0;
467: }
1.22 itojun 468:
1.2 itojun 469: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
470: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
471: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
472: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
473:
1.9 itojun 474: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 475: }
476:
477: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
478:
479: /*
480: * Accept the packet if the forwarding interface to the destination
481: * according to the routing table is the loopback interface,
482: * unless the associated route has a gateway.
483: * Note that this approach causes to accept a packet if there is a
484: * route to the loopback interface for the destination of the packet.
485: * But we think it's even useful in some situations, e.g. when using
486: * a special daemon which wants to intercept the packet.
487: */
488: if (ip6_forward_rt.ro_rt &&
489: (ip6_forward_rt.ro_rt->rt_flags &
490: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
491: #if 0
492: /*
493: * The check below is redundant since the comparison of
494: * the destination and the key of the rtentry has
495: * already done through looking up the routing table.
496: */
497: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
498: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
499: #endif
1.9 itojun 500: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 501: struct in6_ifaddr *ia6 =
502: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
503: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
504: m->m_flags |= M_ANYCAST6;
1.22.2.1 thorpej 505: /*
506: * packets to a tentative, duplicated, or somehow invalid
507: * address must not be accepted.
508: */
1.2 itojun 509: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.22.2.1 thorpej 510: /* this address is ready */
1.2 itojun 511: ours = 1;
1.9 itojun 512: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 513: goto hbhcheck;
514: } else {
1.22.2.1 thorpej 515: /* address is not ready, so discard the packet. */
516: log(LOG_INFO,
517: "ip6_input: packet to an unready address %s->%s",
518: ip6_sprintf(&ip6->ip6_src),
519: ip6_sprintf(&ip6->ip6_dst));
520:
521: goto bad;
1.2 itojun 522: }
523: }
524:
525: /*
526: * FAITH(Firewall Aided Internet Translator)
527: */
528: #if defined(NFAITH) && 0 < NFAITH
529: if (ip6_keepfaith) {
530: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
531: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
532: /* XXX do we need more sanity checks? */
533: ours = 1;
1.9 itojun 534: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
535: goto hbhcheck;
536: }
537: }
538: #endif
539:
540: #if 0
541: {
542: /*
543: * Last resort: check in6_ifaddr for incoming interface.
544: * The code is here until I update the "goto ours hack" code above
545: * working right.
546: */
547: struct ifaddr *ifa;
548: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
549: ifa;
550: ifa = ifa->ifa_list.tqe_next) {
551: if (ifa->ifa_addr == NULL)
552: continue; /* just for safety */
553: if (ifa->ifa_addr->sa_family != AF_INET6)
554: continue;
555: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
556: ours = 1;
557: deliverifp = ifa->ifa_ifp;
1.2 itojun 558: goto hbhcheck;
559: }
560: }
1.9 itojun 561: }
1.2 itojun 562: #endif
563:
564: /*
565: * Now there is no reason to process the packet if it's not our own
566: * and we're not a router.
567: */
568: if (!ip6_forwarding) {
569: ip6stat.ip6s_cantforward++;
1.9 itojun 570: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 571: goto bad;
572: }
573:
574: hbhcheck:
575: /*
576: * Process Hop-by-Hop options header if it's contained.
577: * m may be modified in ip6_hopopts_input().
578: * If a JumboPayload option is included, plen will also be modified.
579: */
580: plen = (u_int32_t)ntohs(ip6->ip6_plen);
581: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 582: struct ip6_hbh *hbh;
583:
584: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
585: #if 0 /*touches NULL pointer*/
586: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
587: #endif
1.2 itojun 588: return; /* m have already been freed */
1.9 itojun 589: }
1.22 itojun 590:
1.2 itojun 591: /* adjust pointer */
592: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 593:
594: /*
595: * if the payload length field is 0 and the next header field
596: * indicates Hop-by-Hop Options header, then a Jumbo Payload
597: * option MUST be included.
598: */
599: if (ip6->ip6_plen == 0 && plen == 0) {
600: /*
601: * Note that if a valid jumbo payload option is
602: * contained, ip6_hoptops_input() must set a valid
603: * (non-zero) payload length to the variable plen.
604: */
605: ip6stat.ip6s_badoptions++;
606: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
607: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
608: icmp6_error(m, ICMP6_PARAM_PROB,
609: ICMP6_PARAMPROB_HEADER,
610: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
611: return;
612: }
1.9 itojun 613: #ifndef PULLDOWN_TEST
614: /* ip6_hopopts_input() ensures that mbuf is contiguous */
615: hbh = (struct ip6_hbh *)(ip6 + 1);
616: #else
617: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
618: sizeof(struct ip6_hbh));
619: if (hbh == NULL) {
620: ip6stat.ip6s_tooshort++;
621: return;
622: }
623: #endif
624: nxt = hbh->ip6h_nxt;
1.2 itojun 625:
626: /*
627: * accept the packet if a router alert option is included
628: * and we act as an IPv6 router.
629: */
1.5 itojun 630: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 631: ours = 1;
632: } else
633: nxt = ip6->ip6_nxt;
634:
635: /*
636: * Check that the amount of data in the buffers
637: * is as at least much as the IPv6 header would have us expect.
638: * Trim mbufs if longer than we expect.
639: * Drop packet if shorter than we expect.
640: */
641: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
642: ip6stat.ip6s_tooshort++;
1.9 itojun 643: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 644: goto bad;
645: }
646: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
647: if (m->m_len == m->m_pkthdr.len) {
648: m->m_len = sizeof(struct ip6_hdr) + plen;
649: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
650: } else
651: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
652: }
653:
654: /*
655: * Forward if desirable.
656: */
657: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
658: /*
659: * If we are acting as a multicast router, all
660: * incoming multicast packets are passed to the
661: * kernel-level multicast forwarding function.
662: * The packet is returned (relatively) intact; if
663: * ip6_mforward() returns a non-zero value, the packet
664: * must be discarded, else it may be accepted below.
665: */
666: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
667: ip6stat.ip6s_cantforward++;
668: m_freem(m);
669: return;
670: }
671: if (!ours) {
672: m_freem(m);
673: return;
674: }
1.22 itojun 675: } else if (!ours) {
1.2 itojun 676: ip6_forward(m, 0);
677: return;
678: }
679:
680: /*
681: * Tell launch routine the next header
682: */
1.12 itojun 683: #ifdef IFA_STATS
1.9 itojun 684: if (IFA_STATS && deliverifp != NULL) {
685: struct in6_ifaddr *ia6;
686: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
687: if (ia6)
688: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
689: }
690: #endif
1.2 itojun 691: ip6stat.ip6s_delivered++;
1.9 itojun 692: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 693: nest = 0;
694: while (nxt != IPPROTO_DONE) {
695: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
696: ip6stat.ip6s_toomanyhdr++;
697: goto bad;
698: }
1.8 itojun 699:
700: /*
701: * protection against faulty packet - there should be
702: * more sanity checks in header chain processing.
703: */
704: if (m->m_pkthdr.len < off) {
705: ip6stat.ip6s_tooshort++;
1.9 itojun 706: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 707: goto bad;
708: }
709:
1.22.2.3 he 710: #ifdef IPSEC
711: /*
712: * enforce IPsec policy checking if we are seeing last header.
713: * note that we do not visit this with protocols with pcb layer
714: * code - like udp/tcp/raw ip.
715: */
716: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
717: ipsec6_in_reject(m, NULL)) {
718: ipsec6stat.in_polvio++;
719: goto bad;
720: }
721: #endif
722:
1.2 itojun 723: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
724: }
725: return;
726: bad:
727: m_freem(m);
728: }
729:
730: /*
731: * Hop-by-Hop options header processing. If a valid jumbo payload option is
732: * included, the real payload length will be stored in plenp.
733: */
734: static int
735: ip6_hopopts_input(plenp, rtalertp, mp, offp)
736: u_int32_t *plenp;
1.5 itojun 737: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 738: struct mbuf **mp;
739: int *offp;
740: {
741: register struct mbuf *m = *mp;
742: int off = *offp, hbhlen;
743: struct ip6_hbh *hbh;
744: u_int8_t *opt;
745:
746: /* validation of the length of the header */
1.9 itojun 747: #ifndef PULLDOWN_TEST
1.2 itojun 748: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
749: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
750: hbhlen = (hbh->ip6h_len + 1) << 3;
751:
752: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
753: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 754: #else
755: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
756: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
757: if (hbh == NULL) {
758: ip6stat.ip6s_tooshort++;
759: return -1;
760: }
761: hbhlen = (hbh->ip6h_len + 1) << 3;
762: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
763: hbhlen);
764: if (hbh == NULL) {
765: ip6stat.ip6s_tooshort++;
766: return -1;
767: }
768: #endif
1.2 itojun 769: off += hbhlen;
770: hbhlen -= sizeof(struct ip6_hbh);
771: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
772:
773: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
774: hbhlen, rtalertp, plenp) < 0)
775: return(-1);
776:
777: *offp = off;
778: *mp = m;
779: return(0);
780: }
781:
782: /*
783: * Search header for all Hop-by-hop options and process each option.
784: * This function is separate from ip6_hopopts_input() in order to
785: * handle a case where the sending node itself process its hop-by-hop
786: * options header. In such a case, the function is called from ip6_output().
787: */
788: int
789: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
790: struct mbuf *m;
791: u_int8_t *opthead;
792: int hbhlen;
1.5 itojun 793: u_int32_t *rtalertp;
1.2 itojun 794: u_int32_t *plenp;
795: {
796: struct ip6_hdr *ip6;
797: int optlen = 0;
798: u_int8_t *opt = opthead;
799: u_int16_t rtalert_val;
1.22 itojun 800: u_int32_t jumboplen;
1.2 itojun 801:
802: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
803: switch(*opt) {
804: case IP6OPT_PAD1:
805: optlen = 1;
806: break;
807: case IP6OPT_PADN:
808: if (hbhlen < IP6OPT_MINLEN) {
809: ip6stat.ip6s_toosmall++;
810: goto bad;
811: }
812: optlen = *(opt + 1) + 2;
813: break;
814: case IP6OPT_RTALERT:
1.8 itojun 815: /* XXX may need check for alignment */
1.2 itojun 816: if (hbhlen < IP6OPT_RTALERT_LEN) {
817: ip6stat.ip6s_toosmall++;
818: goto bad;
819: }
820: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
821: /* XXX: should we discard the packet? */
822: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
823: *(opt + 1));
824: optlen = IP6OPT_RTALERT_LEN;
825: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
826: *rtalertp = ntohs(rtalert_val);
827: break;
828: case IP6OPT_JUMBO:
1.22 itojun 829: /* XXX may need check for alignment */
830: if (hbhlen < IP6OPT_JUMBO_LEN) {
831: ip6stat.ip6s_toosmall++;
832: goto bad;
833: }
834: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
835: /* XXX: should we discard the packet? */
836: log(LOG_ERR, "length of jumbopayload opt "
837: "is inconsistent(%d)",
838: *(opt + 1));
839: optlen = IP6OPT_JUMBO_LEN;
840:
841: /*
842: * IPv6 packets that have non 0 payload length
843: * must not contain a jumbo paylod option.
844: */
845: ip6 = mtod(m, struct ip6_hdr *);
846: if (ip6->ip6_plen) {
847: ip6stat.ip6s_badoptions++;
848: icmp6_error(m, ICMP6_PARAM_PROB,
849: ICMP6_PARAMPROB_HEADER,
850: sizeof(struct ip6_hdr) +
851: sizeof(struct ip6_hbh) +
852: opt - opthead);
853: return(-1);
854: }
1.2 itojun 855:
1.22 itojun 856: /*
857: * We may see jumbolen in unaligned location, so
858: * we'd need to perform bcopy().
859: */
860: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
861: jumboplen = (u_int32_t)htonl(jumboplen);
862:
863: #if 1
864: /*
865: * if there are multiple jumbo payload options,
866: * *plenp will be non-zero and the packet will be
867: * rejected.
868: * the behavior may need some debate in ipngwg -
869: * multiple options does not make sense, however,
870: * there's no explicit mention in specification.
871: */
872: if (*plenp != 0) {
873: ip6stat.ip6s_badoptions++;
874: icmp6_error(m, ICMP6_PARAM_PROB,
875: ICMP6_PARAMPROB_HEADER,
876: sizeof(struct ip6_hdr) +
877: sizeof(struct ip6_hbh) +
878: opt + 2 - opthead);
879: return(-1);
880: }
1.8 itojun 881: #endif
1.2 itojun 882:
1.22 itojun 883: /*
884: * jumbo payload length must be larger than 65535.
885: */
886: if (jumboplen <= IPV6_MAXPACKET) {
887: ip6stat.ip6s_badoptions++;
888: icmp6_error(m, ICMP6_PARAM_PROB,
889: ICMP6_PARAMPROB_HEADER,
890: sizeof(struct ip6_hdr) +
891: sizeof(struct ip6_hbh) +
892: opt + 2 - opthead);
893: return(-1);
894: }
895: *plenp = jumboplen;
896:
897: break;
1.2 itojun 898: default: /* unknown option */
899: if (hbhlen < IP6OPT_MINLEN) {
900: ip6stat.ip6s_toosmall++;
901: goto bad;
902: }
903: if ((optlen = ip6_unknown_opt(opt, m,
904: sizeof(struct ip6_hdr) +
905: sizeof(struct ip6_hbh) +
906: opt - opthead)) == -1)
907: return(-1);
908: optlen += 2;
909: break;
910: }
911: }
912:
913: return(0);
914:
915: bad:
916: m_freem(m);
917: return(-1);
918: }
919:
920: /*
921: * Unknown option processing.
922: * The third argument `off' is the offset from the IPv6 header to the option,
923: * which is necessary if the IPv6 header the and option header and IPv6 header
924: * is not continuous in order to return an ICMPv6 error.
925: */
926: int
927: ip6_unknown_opt(optp, m, off)
928: u_int8_t *optp;
929: struct mbuf *m;
930: int off;
931: {
932: struct ip6_hdr *ip6;
933:
934: switch(IP6OPT_TYPE(*optp)) {
935: case IP6OPT_TYPE_SKIP: /* ignore the option */
936: return((int)*(optp + 1));
937: case IP6OPT_TYPE_DISCARD: /* silently discard */
938: m_freem(m);
939: return(-1);
940: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
941: ip6stat.ip6s_badoptions++;
942: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
943: return(-1);
944: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
945: ip6stat.ip6s_badoptions++;
946: ip6 = mtod(m, struct ip6_hdr *);
947: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
948: (m->m_flags & (M_BCAST|M_MCAST)))
949: m_freem(m);
950: else
951: icmp6_error(m, ICMP6_PARAM_PROB,
952: ICMP6_PARAMPROB_OPTION, off);
953: return(-1);
954: }
955:
956: m_freem(m); /* XXX: NOTREACHED */
957: return(-1);
958: }
959:
960: /*
1.9 itojun 961: * Create the "control" list for this pcb.
962: *
963: * The routine will be called from upper layer handlers like tcp6_input().
964: * Thus the routine assumes that the caller (tcp6_input) have already
965: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
966: * very first mbuf on the mbuf chain.
967: * We may want to add some infinite loop prevention or sanity checks for safety.
968: * (This applies only when you are using KAME mbuf chain restriction, i.e.
969: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 970: */
971: void
972: ip6_savecontrol(in6p, mp, ip6, m)
973: register struct in6pcb *in6p;
974: register struct mbuf **mp;
975: register struct ip6_hdr *ip6;
976: register struct mbuf *m;
977: {
978: struct proc *p = curproc; /* XXX */
1.9 itojun 979: int privileged;
1.2 itojun 980:
1.9 itojun 981: privileged = 0;
982: if (p && !suser(p->p_ucred, &p->p_acflag))
983: privileged++;
984:
985: #ifdef SO_TIMESTAMP
1.2 itojun 986: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
987: struct timeval tv;
988:
989: microtime(&tv);
990: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
991: SCM_TIMESTAMP, SOL_SOCKET);
992: if (*mp)
993: mp = &(*mp)->m_next;
994: }
1.9 itojun 995: #endif
1.2 itojun 996: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
997: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
998: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
999: IPPROTO_IPV6);
1000: if (*mp)
1001: mp = &(*mp)->m_next;
1002: }
1003:
1004: #ifdef noyet
1005: /* options were tossed above */
1006: if (in6p->in6p_flags & IN6P_RECVOPTS)
1007: /* broken */
1008: /* ip6_srcroute doesn't do what we want here, need to fix */
1009: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1010: /* broken */
1011: #endif
1012:
1013: /* RFC 2292 sec. 5 */
1014: if (in6p->in6p_flags & IN6P_PKTINFO) {
1015: struct in6_pktinfo pi6;
1016: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1017: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1018: pi6.ipi6_addr.s6_addr16[1] = 0;
1019: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1020: ? m->m_pkthdr.rcvif->if_index
1021: : 0;
1022: *mp = sbcreatecontrol((caddr_t) &pi6,
1023: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1024: IPPROTO_IPV6);
1025: if (*mp)
1026: mp = &(*mp)->m_next;
1027: }
1028: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1029: int hlim = ip6->ip6_hlim & 0xff;
1030: *mp = sbcreatecontrol((caddr_t) &hlim,
1031: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1032: if (*mp)
1033: mp = &(*mp)->m_next;
1034: }
1035: /* IN6P_NEXTHOP - for outgoing packet only */
1036:
1037: /*
1038: * IPV6_HOPOPTS socket option. We require super-user privilege
1039: * for the option, but it might be too strict, since there might
1040: * be some hop-by-hop options which can be returned to normal user.
1041: * See RFC 2292 section 6.
1042: */
1.9 itojun 1043: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1044: /*
1045: * Check if a hop-by-hop options header is contatined in the
1046: * received packet, and if so, store the options as ancillary
1047: * data. Note that a hop-by-hop options header must be
1048: * just after the IPv6 header, which fact is assured through
1049: * the IPv6 input processing.
1050: */
1051: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1052: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1053: struct ip6_hbh *hbh;
1054: int hbhlen;
1055:
1056: #ifndef PULLDOWN_TEST
1057: hbh = (struct ip6_hbh *)(ip6 + 1);
1058: hbhlen = (hbh->ip6h_len + 1) << 3;
1059: #else
1060: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1061: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1062: if (hbh == NULL) {
1063: ip6stat.ip6s_tooshort++;
1064: return;
1065: }
1066: hbhlen = (hbh->ip6h_len + 1) << 3;
1067: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1068: sizeof(struct ip6_hdr), hbhlen);
1069: if (hbh == NULL) {
1070: ip6stat.ip6s_tooshort++;
1071: return;
1072: }
1073: #endif
1.2 itojun 1074:
1075: /*
1076: * XXX: We copy whole the header even if a jumbo
1077: * payload option is included, which option is to
1078: * be removed before returning in the RFC 2292.
1079: * But it's too painful operation...
1080: */
1.9 itojun 1081: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1082: IPV6_HOPOPTS, IPPROTO_IPV6);
1083: if (*mp)
1084: mp = &(*mp)->m_next;
1085: }
1086: }
1087:
1088: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1089: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1090: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1091: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1092:
1093: /*
1094: * Search for destination options headers or routing
1095: * header(s) through the header chain, and stores each
1096: * header as ancillary data.
1097: * Note that the order of the headers remains in
1098: * the chain of ancillary data.
1099: */
1100: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1101: struct ip6_ext *ip6e;
1102: int elen;
1103:
1104: #ifndef PULLDOWN_TEST
1105: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1106: if (nxt == IPPROTO_AH)
1107: elen = (ip6e->ip6e_len + 2) << 2;
1108: else
1109: elen = (ip6e->ip6e_len + 1) << 3;
1110: #else
1111: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1112: sizeof(struct ip6_ext));
1113: if (ip6e == NULL) {
1114: ip6stat.ip6s_tooshort++;
1115: return;
1116: }
1117: if (nxt == IPPROTO_AH)
1118: elen = (ip6e->ip6e_len + 2) << 2;
1119: else
1120: elen = (ip6e->ip6e_len + 1) << 3;
1121: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1122: if (ip6e == NULL) {
1123: ip6stat.ip6s_tooshort++;
1124: return;
1125: }
1126: #endif
1.2 itojun 1127:
1128: switch(nxt) {
1129: case IPPROTO_DSTOPTS:
1130: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1131: break;
1132:
1133: /*
1134: * We also require super-user privilege for
1135: * the option.
1136: * See the comments on IN6_HOPOPTS.
1137: */
1.9 itojun 1138: if (!privileged)
1.2 itojun 1139: break;
1140:
1.9 itojun 1141: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1142: IPV6_DSTOPTS,
1143: IPPROTO_IPV6);
1144: if (*mp)
1145: mp = &(*mp)->m_next;
1146: break;
1147:
1148: case IPPROTO_ROUTING:
1149: if (!in6p->in6p_flags & IN6P_RTHDR)
1150: break;
1151:
1.9 itojun 1152: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1153: IPV6_RTHDR,
1154: IPPROTO_IPV6);
1155: if (*mp)
1156: mp = &(*mp)->m_next;
1157: break;
1158:
1159: case IPPROTO_UDP:
1160: case IPPROTO_TCP:
1161: case IPPROTO_ICMPV6:
1162: default:
1163: /*
1164: * stop search if we encounter an upper
1165: * layer protocol headers.
1166: */
1167: goto loopend;
1168:
1169: case IPPROTO_HOPOPTS:
1170: case IPPROTO_AH: /* is it possible? */
1171: break;
1172: }
1173:
1174: /* proceed with the next header. */
1.9 itojun 1175: off += elen;
1.2 itojun 1176: nxt = ip6e->ip6e_nxt;
1177: }
1178: loopend:
1179: }
1.9 itojun 1180: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1181: /* to be done */
1182: }
1.9 itojun 1183: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1184: /* to be done */
1185: }
1186: /* IN6P_RTHDR - to be done */
1187:
1188: }
1189:
1190: /*
1191: * Get pointer to the previous header followed by the header
1192: * currently processed.
1193: * XXX: This function supposes that
1194: * M includes all headers,
1195: * the next header field and the header length field of each header
1196: * are valid, and
1197: * the sum of each header length equals to OFF.
1198: * Because of these assumptions, this function must be called very
1199: * carefully. Moreover, it will not be used in the near future when
1200: * we develop `neater' mechanism to process extension headers.
1201: */
1202: char *
1203: ip6_get_prevhdr(m, off)
1204: struct mbuf *m;
1205: int off;
1206: {
1207: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1208:
1209: if (off == sizeof(struct ip6_hdr))
1210: return(&ip6->ip6_nxt);
1211: else {
1212: int len, nxt;
1213: struct ip6_ext *ip6e = NULL;
1214:
1215: nxt = ip6->ip6_nxt;
1216: len = sizeof(struct ip6_hdr);
1217: while (len < off) {
1218: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1219:
1220: switch(nxt) {
1221: case IPPROTO_FRAGMENT:
1222: len += sizeof(struct ip6_frag);
1223: break;
1224: case IPPROTO_AH:
1225: len += (ip6e->ip6e_len + 2) << 2;
1226: break;
1227: default:
1228: len += (ip6e->ip6e_len + 1) << 3;
1229: break;
1230: }
1231: nxt = ip6e->ip6e_nxt;
1232: }
1233: if (ip6e)
1234: return(&ip6e->ip6e_nxt);
1235: else
1236: return NULL;
1.18 itojun 1237: }
1238: }
1239:
1240: /*
1241: * get next header offset. m will be retained.
1242: */
1243: int
1244: ip6_nexthdr(m, off, proto, nxtp)
1245: struct mbuf *m;
1246: int off;
1247: int proto;
1248: int *nxtp;
1249: {
1250: struct ip6_hdr ip6;
1251: struct ip6_ext ip6e;
1252: struct ip6_frag fh;
1253:
1254: /* just in case */
1255: if (m == NULL)
1256: panic("ip6_nexthdr: m == NULL");
1257: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1258: return -1;
1259:
1260: switch (proto) {
1261: case IPPROTO_IPV6:
1262: if (m->m_pkthdr.len < off + sizeof(ip6))
1263: return -1;
1264: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1265: if (nxtp)
1266: *nxtp = ip6.ip6_nxt;
1267: off += sizeof(ip6);
1268: return off;
1269:
1270: case IPPROTO_FRAGMENT:
1271: /*
1272: * terminate parsing if it is not the first fragment,
1273: * it does not make sense to parse through it.
1274: */
1275: if (m->m_pkthdr.len < off + sizeof(fh))
1276: return -1;
1277: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1.22.2.6! jmc 1278: if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18 itojun 1279: return -1;
1280: if (nxtp)
1281: *nxtp = fh.ip6f_nxt;
1282: off += sizeof(struct ip6_frag);
1283: return off;
1284:
1285: case IPPROTO_AH:
1286: if (m->m_pkthdr.len < off + sizeof(ip6e))
1287: return -1;
1288: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1289: if (nxtp)
1290: *nxtp = ip6e.ip6e_nxt;
1291: off += (ip6e.ip6e_len + 2) << 2;
1292: return off;
1293:
1294: case IPPROTO_HOPOPTS:
1295: case IPPROTO_ROUTING:
1296: case IPPROTO_DSTOPTS:
1297: if (m->m_pkthdr.len < off + sizeof(ip6e))
1298: return -1;
1299: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1300: if (nxtp)
1301: *nxtp = ip6e.ip6e_nxt;
1302: off += (ip6e.ip6e_len + 1) << 3;
1303: return off;
1304:
1305: case IPPROTO_NONE:
1306: case IPPROTO_ESP:
1307: case IPPROTO_IPCOMP:
1308: /* give up */
1309: return -1;
1310:
1311: default:
1312: return -1;
1313: }
1314:
1315: return -1;
1316: }
1317:
1318: /*
1319: * get offset for the last header in the chain. m will be kept untainted.
1320: */
1321: int
1322: ip6_lasthdr(m, off, proto, nxtp)
1323: struct mbuf *m;
1324: int off;
1325: int proto;
1326: int *nxtp;
1327: {
1328: int newoff;
1329: int nxt;
1330:
1331: if (!nxtp) {
1332: nxt = -1;
1333: nxtp = &nxt;
1334: }
1335: while (1) {
1336: newoff = ip6_nexthdr(m, off, proto, nxtp);
1337: if (newoff < 0)
1338: return off;
1339: else if (newoff < off)
1340: return -1; /* invalid */
1341: else if (newoff == off)
1342: return newoff;
1343:
1344: off = newoff;
1345: proto = *nxtp;
1.2 itojun 1346: }
1347: }
1348:
1349: /*
1350: * System control for IP6
1351: */
1352:
1353: u_char inet6ctlerrmap[PRC_NCMDS] = {
1354: 0, 0, 0, 0,
1355: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1356: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1357: EMSGSIZE, EHOSTUNREACH, 0, 0,
1358: 0, 0, 0, 0,
1359: ENOPROTOOPT
1360: };
1361:
1362: #include <vm/vm.h>
1363: #include <sys/sysctl.h>
1364:
1365: int
1366: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1367: int *name;
1368: u_int namelen;
1369: void *oldp;
1370: size_t *oldlenp;
1371: void *newp;
1372: size_t newlen;
1373: {
1.22.2.2 itojun 1374: int old, error;
1375:
1.2 itojun 1376: /* All sysctl names at this level are terminal. */
1377: if (namelen != 1)
1378: return ENOTDIR;
1379:
1380: switch (name[0]) {
1381:
1382: case IPV6CTL_FORWARDING:
1383: return sysctl_int(oldp, oldlenp, newp, newlen,
1384: &ip6_forwarding);
1385: case IPV6CTL_SENDREDIRECTS:
1386: return sysctl_int(oldp, oldlenp, newp, newlen,
1387: &ip6_sendredirects);
1388: case IPV6CTL_DEFHLIM:
1389: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1390: case IPV6CTL_MAXFRAGPACKETS:
1391: return sysctl_int(oldp, oldlenp, newp, newlen,
1392: &ip6_maxfragpackets);
1393: case IPV6CTL_ACCEPT_RTADV:
1394: return sysctl_int(oldp, oldlenp, newp, newlen,
1395: &ip6_accept_rtadv);
1396: case IPV6CTL_KEEPFAITH:
1397: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1398: case IPV6CTL_LOG_INTERVAL:
1399: return sysctl_int(oldp, oldlenp, newp, newlen,
1400: &ip6_log_interval);
1401: case IPV6CTL_HDRNESTLIMIT:
1402: return sysctl_int(oldp, oldlenp, newp, newlen,
1403: &ip6_hdrnestlimit);
1404: case IPV6CTL_DAD_COUNT:
1405: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1406: case IPV6CTL_AUTO_FLOWLABEL:
1407: return sysctl_int(oldp, oldlenp, newp, newlen,
1408: &ip6_auto_flowlabel);
1409: case IPV6CTL_DEFMCASTHLIM:
1410: return sysctl_int(oldp, oldlenp, newp, newlen,
1411: &ip6_defmcasthlim);
1412: case IPV6CTL_GIF_HLIM:
1413: return sysctl_int(oldp, oldlenp, newp, newlen,
1414: &ip6_gif_hlim);
1415: case IPV6CTL_KAME_VERSION:
1416: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1417: case IPV6CTL_USE_DEPRECATED:
1418: return sysctl_int(oldp, oldlenp, newp, newlen,
1419: &ip6_use_deprecated);
1.10 itojun 1420: case IPV6CTL_RR_PRUNE:
1421: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1422: #ifndef INET6_BINDV6ONLY
1.11 itojun 1423: case IPV6CTL_BINDV6ONLY:
1424: return sysctl_int(oldp, oldlenp, newp, newlen,
1425: &ip6_bindv6only);
1.22.2.2 itojun 1426: #endif
1427: case IPV6CTL_ANONPORTMIN:
1428: old = ip6_anonportmin;
1429: error = sysctl_int(oldp, oldlenp, newp, newlen,
1430: &ip6_anonportmin);
1431: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1432: ip6_anonportmin > 65535
1433: #ifndef IPNOPRIVPORTS
1434: || ip6_anonportmin < IPV6PORT_RESERVED
1435: #endif
1436: ) {
1437: ip6_anonportmin = old;
1438: return (EINVAL);
1439: }
1440: return (error);
1441: case IPV6CTL_ANONPORTMAX:
1442: old = ip6_anonportmax;
1443: error = sysctl_int(oldp, oldlenp, newp, newlen,
1444: &ip6_anonportmax);
1445: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1446: ip6_anonportmax > 65535
1447: #ifndef IPNOPRIVPORTS
1448: || ip6_anonportmax < IPV6PORT_RESERVED
1449: #endif
1450: ) {
1451: ip6_anonportmax = old;
1452: return (EINVAL);
1453: }
1454: return (error);
1455: #ifndef IPNOPRIVPORTS
1456: case IPV6CTL_LOWPORTMIN:
1457: old = ip6_lowportmin;
1458: error = sysctl_int(oldp, oldlenp, newp, newlen,
1459: &ip6_lowportmin);
1460: if (ip6_lowportmin >= ip6_lowportmax ||
1461: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1462: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1463: ip6_lowportmin = old;
1464: return (EINVAL);
1465: }
1466: return (error);
1467: case IPV6CTL_LOWPORTMAX:
1468: old = ip6_lowportmax;
1469: error = sysctl_int(oldp, oldlenp, newp, newlen,
1470: &ip6_lowportmax);
1471: if (ip6_lowportmin >= ip6_lowportmax ||
1472: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1473: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1474: ip6_lowportmax = old;
1475: return (EINVAL);
1476: }
1477: return (error);
1.11 itojun 1478: #endif
1.2 itojun 1479: default:
1480: return EOPNOTSUPP;
1481: }
1482: /* NOTREACHED */
1483: }
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