Annotation of src/sys/netinet6/ip6_input.c, Revision 1.8.2.3
1.8.2.2 bouyer 1: /* $NetBSD$ */
1.8.2.1 bouyer 2: /* $KAME: ip6_input.c,v 1.121 2000/08/31 06:07:29 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.8.2.1 bouyer 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.
1.8.2.1 bouyer 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"
1.8.2.1 bouyer 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>
1.8.2.1 bouyer 91: #ifdef PFIL_HOOKS
92: #include <net/pfil.h>
93: #endif
1.2 itojun 94:
95: #include <netinet/in.h>
96: #include <netinet/in_systm.h>
97: #ifdef INET
98: #include <netinet/ip.h>
99: #include <netinet/ip_icmp.h>
100: #endif /*INET*/
1.8.2.1 bouyer 101: #include <netinet/ip6.h>
102: #include <netinet6/in6_var.h>
103: #include <netinet6/ip6_var.h>
104: #include <netinet6/in6_pcb.h>
105: #include <netinet/icmp6.h>
106: #include <netinet6/in6_ifattach.h>
107: #include <netinet6/nd6.h>
108: #include <netinet6/in6_prefix.h>
109:
110: #ifdef IPV6FIREWALL
111: #include <netinet6/ip6_fw.h>
112: #endif
1.2 itojun 113:
114: #include <netinet6/ip6protosw.h>
115:
116: /* we need it for NLOOP. */
117: #include "loop.h"
118: #include "faith.h"
119:
120: #include "gif.h"
121: #include "bpfilter.h"
122:
1.8.2.1 bouyer 123: #include <net/net_osdep.h>
124:
1.2 itojun 125: extern struct domain inet6domain;
126:
127: u_char ip6_protox[IPPROTO_MAX];
128: static int ip6qmaxlen = IFQ_MAXLEN;
129: struct in6_ifaddr *in6_ifaddr;
130: struct ifqueue ip6intrq;
131:
132: extern struct ifnet loif[NLOOP];
133: int ip6_forward_srcrt; /* XXX */
134: int ip6_sourcecheck; /* XXX */
135: int ip6_sourcecheck_interval; /* XXX */
1.8.2.1 bouyer 136:
137: #ifdef IPV6FIREWALL
138: /* firewall hooks */
139: ip6_fw_chk_t *ip6_fw_chk_ptr;
140: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2 itojun 141: #endif
142:
1.8.2.2 bouyer 143: #ifdef PFIL_HOOKS
144: struct pfil_head inet6_pfil_hook;
145: #endif
146:
1.2 itojun 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();
1.8.2.1 bouyer 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);
1.8.2.2 bouyer 188:
189: #ifdef PFIL_HOOKS
190: /* Register our Packet Filter hook. */
1.8.2.3 ! bouyer 191: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
! 192: inet6_pfil_hook.ph_af = AF_INET6;
1.8.2.2 bouyer 193: i = pfil_head_register(&inet6_pfil_hook);
194: if (i != 0)
195: printf("ip6_init: WARNING: unable to register pfil hook, "
196: "error %d\n", i);
197: #endif /* PFIL_HOOKS */
1.2 itojun 198: }
199:
200: static void
201: ip6_init2(dummy)
202: void *dummy;
203: {
204: /*
205: * to route local address of p2p link to loopback,
1.8.2.1 bouyer 206: * assign loopback address first.
1.2 itojun 207: */
1.8.2.1 bouyer 208: in6_ifattach(&loif[0], NULL);
1.2 itojun 209:
210: /* nd6_timer_init */
1.8.2.1 bouyer 211: callout_init(&nd6_timer_ch);
212: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
213: /* router renumbering prefix list maintenance */
214: callout_init(&in6_rr_timer_ch);
215: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 216: }
217:
218: /*
219: * IP6 input interrupt handling. Just pass the packet to ip6_input.
220: */
221: void
222: ip6intr()
223: {
224: int s;
225: struct mbuf *m;
226:
227: for (;;) {
228: s = splimp();
229: IF_DEQUEUE(&ip6intrq, m);
230: splx(s);
231: if (m == 0)
232: return;
233: ip6_input(m);
234: }
235: }
236:
237: extern struct route_in6 ip6_forward_rt;
238:
239: void
240: ip6_input(m)
241: struct mbuf *m;
242: {
1.8.2.1 bouyer 243: struct ip6_hdr *ip6;
1.2 itojun 244: int off = sizeof(struct ip6_hdr), nest;
245: u_int32_t plen;
1.5 itojun 246: u_int32_t rtalert = ~0;
1.2 itojun 247: int nxt, ours = 0;
1.8.2.1 bouyer 248: struct ifnet *deliverifp = NULL;
1.2 itojun 249:
250: #ifdef IPSEC
251: /*
252: * should the inner packet be considered authentic?
253: * see comment in ah4_input().
254: */
255: if (m) {
256: m->m_flags &= ~M_AUTHIPHDR;
257: m->m_flags &= ~M_AUTHIPDGM;
258: }
259: #endif
1.8.2.1 bouyer 260:
1.2 itojun 261: /*
262: * mbuf statistics by kazu
263: */
264: if (m->m_flags & M_EXT) {
265: if (m->m_next)
266: ip6stat.ip6s_mext2m++;
267: else
268: ip6stat.ip6s_mext1++;
269: } else {
270: if (m->m_next) {
1.8.2.1 bouyer 271: if (m->m_flags & M_LOOP) {
1.2 itojun 272: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.8.2.1 bouyer 273: } else if (m->m_pkthdr.rcvif->if_index <= 31)
1.2 itojun 274: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
275: else
276: ip6stat.ip6s_m2m[0]++;
277: } else
278: ip6stat.ip6s_m1++;
279: }
280:
1.8.2.1 bouyer 281: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.2 itojun 282: ip6stat.ip6s_total++;
283:
1.8.2.1 bouyer 284: #ifndef PULLDOWN_TEST
285: /* XXX is the line really necessary? */
286: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
287: #endif
288:
289: if (m->m_len < sizeof(struct ip6_hdr)) {
290: struct ifnet *inifp;
291: inifp = m->m_pkthdr.rcvif;
292: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
293: ip6stat.ip6s_toosmall++;
294: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
295: return;
296: }
1.2 itojun 297: }
298:
299: ip6 = mtod(m, struct ip6_hdr *);
300:
301: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
302: ip6stat.ip6s_badvers++;
1.8.2.1 bouyer 303: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 304: goto bad;
305: }
306:
1.8.2.1 bouyer 307: #ifdef PFIL_HOOKS
308: /*
309: * Run through list of hooks for input packets. If there are any
310: * filters which require that additional packets in the flow are
311: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
312: * Note that filters must _never_ set this flag, as another filter
313: * in the list may have previously cleared it.
314: */
1.8.2.2 bouyer 315: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
316: PFIL_IN) != 0)
317: return;
318: if (m == NULL)
319: return;
320: ip6 = mtod(m, struct ip6_hdr *);
1.8.2.1 bouyer 321: #endif /* PFIL_HOOKS */
322:
323:
1.2 itojun 324: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
325:
1.8.2.1 bouyer 326: #ifdef IPV6FIREWALL
327: /*
328: * Check with the firewall...
329: */
330: if (ip6_fw_chk_ptr) {
331: u_short port = 0;
332: /* If ipfw says divert, we have to just drop packet */
333: /* use port as a dummy argument */
334: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
335: m_freem(m);
336: m = NULL;
337: }
338: if (!m)
339: return;
1.8.2.3 ! bouyer 340: }
! 341: #endif
! 342:
! 343: #ifdef ALTQ
! 344: /* XXX Temporary until ALTQ is changed to use a pfil hook */
! 345: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
! 346: /* packet is dropped by traffic conditioner */
! 347: return;
1.8.2.1 bouyer 348: }
349: #endif
350:
1.2 itojun 351: /*
352: * Scope check
353: */
354: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
355: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
356: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 357: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 358: goto bad;
359: }
1.8.2.1 bouyer 360: /*
361: * The following check is not documented in the spec. Malicious party
362: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
363: * bypass security checks (act as if it was from 127.0.0.1 by using
364: * IPv6 src ::ffff:127.0.0.1). Be cautious.
365: */
366: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
367: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
368: ip6stat.ip6s_badscope++;
369: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
370: goto bad;
371: }
372: #if 0
373: /*
374: * Reject packets with IPv4 compatible addresses (auto tunnel).
375: *
376: * The code forbids auto tunnel relay case in RFC1933 (the check is
377: * stronger than RFC1933). We may want to re-enable it if mech-xx
378: * is revised to forbid relaying case.
379: */
380: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
381: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
382: ip6stat.ip6s_badscope++;
383: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
384: goto bad;
385: }
386: #endif
1.2 itojun 387: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
388: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
389: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
390: ours = 1;
1.8.2.1 bouyer 391: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 392: goto hbhcheck;
393: } else {
394: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 395: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 396: goto bad;
397: }
398: }
399:
1.8.2.1 bouyer 400: #ifndef FAKE_LOOPBACK_IF
401: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
402: #else
403: if (1)
404: #endif
405: {
1.2 itojun 406: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
407: ip6->ip6_src.s6_addr16[1]
408: = htons(m->m_pkthdr.rcvif->if_index);
409: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
410: ip6->ip6_dst.s6_addr16[1]
411: = htons(m->m_pkthdr.rcvif->if_index);
412: }
413:
414: /*
1.8.2.1 bouyer 415: * XXX we need this since we do not have "goto ours" hack route
416: * for some of our ifaddrs on loopback interface.
417: * we should correct it by changing in6_ifattach to install
418: * "goto ours" hack route.
419: */
420: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
421: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
422: ours = 1;
423: deliverifp = m->m_pkthdr.rcvif;
424: goto hbhcheck;
425: }
426: }
427:
428: /*
1.2 itojun 429: * Multicast check
430: */
431: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
432: struct in6_multi *in6m = 0;
1.8.2.1 bouyer 433:
434: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 435: /*
436: * See if we belong to the destination multicast group on the
437: * arrival interface.
438: */
439: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
440: if (in6m)
441: ours = 1;
442: else if (!ip6_mrouter) {
443: ip6stat.ip6s_notmember++;
444: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 445: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 446: goto bad;
447: }
1.8.2.1 bouyer 448: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 449: goto hbhcheck;
450: }
451:
452: /*
453: * Unicast check
454: */
1.8.2.1 bouyer 455: if (ip6_forward_rt.ro_rt != NULL &&
456: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
457: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
458: &ip6_forward_rt.ro_dst.sin6_addr))
459: ip6stat.ip6s_forward_cachehit++;
460: else {
1.2 itojun 461: if (ip6_forward_rt.ro_rt) {
1.8.2.1 bouyer 462: /* route is down or destination is different */
463: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 464: RTFREE(ip6_forward_rt.ro_rt);
465: ip6_forward_rt.ro_rt = 0;
466: }
1.8.2.1 bouyer 467:
1.2 itojun 468: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
469: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
470: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
471: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
472:
473: rtalloc((struct route *)&ip6_forward_rt);
474: }
475:
476: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
477:
478: /*
479: * Accept the packet if the forwarding interface to the destination
480: * according to the routing table is the loopback interface,
481: * unless the associated route has a gateway.
482: * Note that this approach causes to accept a packet if there is a
483: * route to the loopback interface for the destination of the packet.
484: * But we think it's even useful in some situations, e.g. when using
485: * a special daemon which wants to intercept the packet.
486: */
487: if (ip6_forward_rt.ro_rt &&
488: (ip6_forward_rt.ro_rt->rt_flags &
489: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
490: #if 0
491: /*
492: * The check below is redundant since the comparison of
493: * the destination and the key of the rtentry has
494: * already done through looking up the routing table.
495: */
496: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
497: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
498: #endif
1.8.2.1 bouyer 499: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 500: struct in6_ifaddr *ia6 =
501: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
502: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
503: m->m_flags |= M_ANYCAST6;
1.8.2.1 bouyer 504: /*
505: * packets to a tentative, duplicated, or somehow invalid
506: * address must not be accepted.
507: */
1.2 itojun 508: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.8.2.1 bouyer 509: /* this address is ready */
1.2 itojun 510: ours = 1;
1.8.2.1 bouyer 511: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 512: goto hbhcheck;
513: } else {
1.8.2.1 bouyer 514: /* address is not ready, so discard the packet. */
515: log(LOG_INFO,
516: "ip6_input: packet to an unready address %s->%s\n",
517: ip6_sprintf(&ip6->ip6_src),
518: ip6_sprintf(&ip6->ip6_dst));
519:
520: goto bad;
1.2 itojun 521: }
522: }
523:
524: /*
525: * FAITH(Firewall Aided Internet Translator)
526: */
527: #if defined(NFAITH) && 0 < NFAITH
528: if (ip6_keepfaith) {
529: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
530: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
531: /* XXX do we need more sanity checks? */
532: ours = 1;
1.8.2.1 bouyer 533: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
534: goto hbhcheck;
535: }
536: }
537: #endif
538:
539: #if 0
540: {
541: /*
542: * Last resort: check in6_ifaddr for incoming interface.
543: * The code is here until I update the "goto ours hack" code above
544: * working right.
545: */
546: struct ifaddr *ifa;
547: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
548: ifa;
549: ifa = ifa->ifa_list.tqe_next) {
550: if (ifa->ifa_addr == NULL)
551: continue; /* just for safety */
552: if (ifa->ifa_addr->sa_family != AF_INET6)
553: continue;
554: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
555: ours = 1;
556: deliverifp = ifa->ifa_ifp;
1.2 itojun 557: goto hbhcheck;
558: }
559: }
1.8.2.1 bouyer 560: }
1.2 itojun 561: #endif
562:
563: /*
564: * Now there is no reason to process the packet if it's not our own
565: * and we're not a router.
566: */
567: if (!ip6_forwarding) {
568: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 569: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 570: goto bad;
571: }
572:
573: hbhcheck:
574: /*
575: * Process Hop-by-Hop options header if it's contained.
576: * m may be modified in ip6_hopopts_input().
577: * If a JumboPayload option is included, plen will also be modified.
578: */
579: plen = (u_int32_t)ntohs(ip6->ip6_plen);
580: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 581: struct ip6_hbh *hbh;
582:
583: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
584: #if 0 /*touches NULL pointer*/
585: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
586: #endif
1.2 itojun 587: return; /* m have already been freed */
1.8.2.1 bouyer 588: }
589:
1.2 itojun 590: /* adjust pointer */
591: ip6 = mtod(m, struct ip6_hdr *);
1.8.2.1 bouyer 592:
593: /*
594: * if the payload length field is 0 and the next header field
595: * indicates Hop-by-Hop Options header, then a Jumbo Payload
596: * option MUST be included.
597: */
598: if (ip6->ip6_plen == 0 && plen == 0) {
599: /*
600: * Note that if a valid jumbo payload option is
601: * contained, ip6_hoptops_input() must set a valid
602: * (non-zero) payload length to the variable plen.
603: */
604: ip6stat.ip6s_badoptions++;
605: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
606: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
607: icmp6_error(m, ICMP6_PARAM_PROB,
608: ICMP6_PARAMPROB_HEADER,
609: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
610: return;
611: }
612: #ifndef PULLDOWN_TEST
613: /* ip6_hopopts_input() ensures that mbuf is contiguous */
614: hbh = (struct ip6_hbh *)(ip6 + 1);
615: #else
616: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
617: sizeof(struct ip6_hbh));
618: if (hbh == NULL) {
619: ip6stat.ip6s_tooshort++;
620: return;
621: }
622: #endif
623: nxt = hbh->ip6h_nxt;
1.2 itojun 624:
625: /*
626: * accept the packet if a router alert option is included
627: * and we act as an IPv6 router.
628: */
1.5 itojun 629: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 630: ours = 1;
631: } else
632: nxt = ip6->ip6_nxt;
633:
634: /*
635: * Check that the amount of data in the buffers
636: * is as at least much as the IPv6 header would have us expect.
637: * Trim mbufs if longer than we expect.
638: * Drop packet if shorter than we expect.
639: */
640: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
641: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 642: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 643: goto bad;
644: }
645: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
646: if (m->m_len == m->m_pkthdr.len) {
647: m->m_len = sizeof(struct ip6_hdr) + plen;
648: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
649: } else
650: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
651: }
652:
653: /*
654: * Forward if desirable.
655: */
656: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
657: /*
658: * If we are acting as a multicast router, all
659: * incoming multicast packets are passed to the
660: * kernel-level multicast forwarding function.
661: * The packet is returned (relatively) intact; if
662: * ip6_mforward() returns a non-zero value, the packet
663: * must be discarded, else it may be accepted below.
664: */
665: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
666: ip6stat.ip6s_cantforward++;
667: m_freem(m);
668: return;
669: }
670: if (!ours) {
671: m_freem(m);
672: return;
673: }
1.8.2.1 bouyer 674: } else if (!ours) {
1.2 itojun 675: ip6_forward(m, 0);
676: return;
677: }
678:
1.8.2.1 bouyer 679: ip6 = mtod(m, struct ip6_hdr *);
680:
681: /*
682: * Malicious party may be able to use IPv4 mapped addr to confuse
683: * tcp/udp stack and bypass security checks (act as if it was from
684: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
685: *
686: * For SIIT end node behavior, you may want to disable the check.
687: * However, you will become vulnerable to attacks using IPv4 mapped
688: * source.
689: */
690: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
691: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
692: ip6stat.ip6s_badscope++;
693: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
694: goto bad;
695: }
696:
1.2 itojun 697: /*
698: * Tell launch routine the next header
699: */
1.8.2.1 bouyer 700: #ifdef IFA_STATS
701: if (deliverifp != NULL) {
702: struct in6_ifaddr *ia6;
703: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
704: if (ia6)
705: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
706: }
707: #endif
1.2 itojun 708: ip6stat.ip6s_delivered++;
1.8.2.1 bouyer 709: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 710: nest = 0;
711: while (nxt != IPPROTO_DONE) {
712: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
713: ip6stat.ip6s_toomanyhdr++;
714: goto bad;
715: }
1.8 itojun 716:
717: /*
718: * protection against faulty packet - there should be
719: * more sanity checks in header chain processing.
720: */
721: if (m->m_pkthdr.len < off) {
722: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 723: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 724: goto bad;
725: }
726:
1.2 itojun 727: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
728: }
729: return;
730: bad:
731: m_freem(m);
732: }
733:
734: /*
735: * Hop-by-Hop options header processing. If a valid jumbo payload option is
736: * included, the real payload length will be stored in plenp.
737: */
738: static int
739: ip6_hopopts_input(plenp, rtalertp, mp, offp)
740: u_int32_t *plenp;
1.5 itojun 741: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 742: struct mbuf **mp;
743: int *offp;
744: {
745: register struct mbuf *m = *mp;
746: int off = *offp, hbhlen;
747: struct ip6_hbh *hbh;
748: u_int8_t *opt;
749:
750: /* validation of the length of the header */
1.8.2.1 bouyer 751: #ifndef PULLDOWN_TEST
1.2 itojun 752: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
753: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
754: hbhlen = (hbh->ip6h_len + 1) << 3;
755:
756: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
757: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.8.2.1 bouyer 758: #else
759: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
760: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
761: if (hbh == NULL) {
762: ip6stat.ip6s_tooshort++;
763: return -1;
764: }
765: hbhlen = (hbh->ip6h_len + 1) << 3;
766: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
767: hbhlen);
768: if (hbh == NULL) {
769: ip6stat.ip6s_tooshort++;
770: return -1;
771: }
772: #endif
1.2 itojun 773: off += hbhlen;
774: hbhlen -= sizeof(struct ip6_hbh);
775: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
776:
777: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
778: hbhlen, rtalertp, plenp) < 0)
779: return(-1);
780:
781: *offp = off;
782: *mp = m;
783: return(0);
784: }
785:
786: /*
787: * Search header for all Hop-by-hop options and process each option.
788: * This function is separate from ip6_hopopts_input() in order to
789: * handle a case where the sending node itself process its hop-by-hop
790: * options header. In such a case, the function is called from ip6_output().
791: */
792: int
793: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
794: struct mbuf *m;
795: u_int8_t *opthead;
796: int hbhlen;
1.5 itojun 797: u_int32_t *rtalertp;
1.2 itojun 798: u_int32_t *plenp;
799: {
800: struct ip6_hdr *ip6;
801: int optlen = 0;
802: u_int8_t *opt = opthead;
803: u_int16_t rtalert_val;
1.8.2.1 bouyer 804: u_int32_t jumboplen;
1.2 itojun 805:
806: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
807: switch(*opt) {
808: case IP6OPT_PAD1:
809: optlen = 1;
810: break;
811: case IP6OPT_PADN:
812: if (hbhlen < IP6OPT_MINLEN) {
813: ip6stat.ip6s_toosmall++;
814: goto bad;
815: }
816: optlen = *(opt + 1) + 2;
817: break;
818: case IP6OPT_RTALERT:
1.8 itojun 819: /* XXX may need check for alignment */
1.2 itojun 820: if (hbhlen < IP6OPT_RTALERT_LEN) {
821: ip6stat.ip6s_toosmall++;
822: goto bad;
823: }
824: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
825: /* XXX: should we discard the packet? */
826: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
827: *(opt + 1));
828: optlen = IP6OPT_RTALERT_LEN;
829: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
830: *rtalertp = ntohs(rtalert_val);
831: break;
832: case IP6OPT_JUMBO:
1.8.2.1 bouyer 833: /* XXX may need check for alignment */
834: if (hbhlen < IP6OPT_JUMBO_LEN) {
835: ip6stat.ip6s_toosmall++;
836: goto bad;
837: }
838: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
839: /* XXX: should we discard the packet? */
840: log(LOG_ERR, "length of jumbopayload opt "
841: "is inconsistent(%d)\n",
842: *(opt + 1));
843: optlen = IP6OPT_JUMBO_LEN;
1.2 itojun 844:
1.8.2.1 bouyer 845: /*
846: * IPv6 packets that have non 0 payload length
847: * must not contain a jumbo paylod option.
848: */
849: ip6 = mtod(m, struct ip6_hdr *);
850: if (ip6->ip6_plen) {
851: ip6stat.ip6s_badoptions++;
852: icmp6_error(m, ICMP6_PARAM_PROB,
853: ICMP6_PARAMPROB_HEADER,
854: sizeof(struct ip6_hdr) +
855: sizeof(struct ip6_hbh) +
856: opt - opthead);
857: return(-1);
858: }
859:
860: /*
861: * We may see jumbolen in unaligned location, so
862: * we'd need to perform bcopy().
863: */
864: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
865: jumboplen = (u_int32_t)htonl(jumboplen);
866:
867: #if 1
868: /*
869: * if there are multiple jumbo payload options,
870: * *plenp will be non-zero and the packet will be
871: * rejected.
872: * the behavior may need some debate in ipngwg -
873: * multiple options does not make sense, however,
874: * there's no explicit mention in specification.
875: */
876: if (*plenp != 0) {
877: ip6stat.ip6s_badoptions++;
878: icmp6_error(m, ICMP6_PARAM_PROB,
879: ICMP6_PARAMPROB_HEADER,
880: sizeof(struct ip6_hdr) +
881: sizeof(struct ip6_hbh) +
882: opt + 2 - opthead);
883: return(-1);
884: }
1.8 itojun 885: #endif
1.2 itojun 886:
1.8.2.1 bouyer 887: /*
888: * jumbo payload length must be larger than 65535.
889: */
890: if (jumboplen <= IPV6_MAXPACKET) {
891: ip6stat.ip6s_badoptions++;
892: icmp6_error(m, ICMP6_PARAM_PROB,
893: ICMP6_PARAMPROB_HEADER,
894: sizeof(struct ip6_hdr) +
895: sizeof(struct ip6_hbh) +
896: opt + 2 - opthead);
897: return(-1);
898: }
899: *plenp = jumboplen;
900:
901: break;
1.2 itojun 902: default: /* unknown option */
903: if (hbhlen < IP6OPT_MINLEN) {
904: ip6stat.ip6s_toosmall++;
905: goto bad;
906: }
907: if ((optlen = ip6_unknown_opt(opt, m,
908: sizeof(struct ip6_hdr) +
909: sizeof(struct ip6_hbh) +
910: opt - opthead)) == -1)
911: return(-1);
912: optlen += 2;
913: break;
914: }
915: }
916:
917: return(0);
918:
919: bad:
920: m_freem(m);
921: return(-1);
922: }
923:
924: /*
925: * Unknown option processing.
926: * The third argument `off' is the offset from the IPv6 header to the option,
927: * which is necessary if the IPv6 header the and option header and IPv6 header
928: * is not continuous in order to return an ICMPv6 error.
929: */
930: int
931: ip6_unknown_opt(optp, m, off)
932: u_int8_t *optp;
933: struct mbuf *m;
934: int off;
935: {
936: struct ip6_hdr *ip6;
937:
938: switch(IP6OPT_TYPE(*optp)) {
939: case IP6OPT_TYPE_SKIP: /* ignore the option */
940: return((int)*(optp + 1));
941: case IP6OPT_TYPE_DISCARD: /* silently discard */
942: m_freem(m);
943: return(-1);
944: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
945: ip6stat.ip6s_badoptions++;
946: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
947: return(-1);
948: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
949: ip6stat.ip6s_badoptions++;
950: ip6 = mtod(m, struct ip6_hdr *);
951: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
952: (m->m_flags & (M_BCAST|M_MCAST)))
953: m_freem(m);
954: else
955: icmp6_error(m, ICMP6_PARAM_PROB,
956: ICMP6_PARAMPROB_OPTION, off);
957: return(-1);
958: }
959:
960: m_freem(m); /* XXX: NOTREACHED */
961: return(-1);
962: }
963:
964: /*
1.8.2.1 bouyer 965: * Create the "control" list for this pcb.
966: *
967: * The routine will be called from upper layer handlers like tcp6_input().
968: * Thus the routine assumes that the caller (tcp6_input) have already
969: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
970: * very first mbuf on the mbuf chain.
971: * We may want to add some infinite loop prevention or sanity checks for safety.
972: * (This applies only when you are using KAME mbuf chain restriction, i.e.
973: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 974: */
975: void
976: ip6_savecontrol(in6p, mp, ip6, m)
977: register struct in6pcb *in6p;
978: register struct mbuf **mp;
979: register struct ip6_hdr *ip6;
980: register struct mbuf *m;
981: {
982: struct proc *p = curproc; /* XXX */
1.8.2.1 bouyer 983: int privileged;
984:
985: privileged = 0;
986: if (p && !suser(p->p_ucred, &p->p_acflag))
987: privileged++;
1.2 itojun 988:
1.8.2.1 bouyer 989: #ifdef SO_TIMESTAMP
1.2 itojun 990: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
991: struct timeval tv;
992:
993: microtime(&tv);
994: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
995: SCM_TIMESTAMP, SOL_SOCKET);
996: if (*mp)
997: mp = &(*mp)->m_next;
998: }
1.8.2.1 bouyer 999: #endif
1.2 itojun 1000: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1001: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1002: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1003: IPPROTO_IPV6);
1004: if (*mp)
1005: mp = &(*mp)->m_next;
1006: }
1007:
1008: #ifdef noyet
1009: /* options were tossed above */
1010: if (in6p->in6p_flags & IN6P_RECVOPTS)
1011: /* broken */
1012: /* ip6_srcroute doesn't do what we want here, need to fix */
1013: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1014: /* broken */
1015: #endif
1016:
1017: /* RFC 2292 sec. 5 */
1018: if (in6p->in6p_flags & IN6P_PKTINFO) {
1019: struct in6_pktinfo pi6;
1020: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1021: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1022: pi6.ipi6_addr.s6_addr16[1] = 0;
1023: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1024: ? m->m_pkthdr.rcvif->if_index
1025: : 0;
1026: *mp = sbcreatecontrol((caddr_t) &pi6,
1027: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1028: IPPROTO_IPV6);
1029: if (*mp)
1030: mp = &(*mp)->m_next;
1031: }
1032: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1033: int hlim = ip6->ip6_hlim & 0xff;
1034: *mp = sbcreatecontrol((caddr_t) &hlim,
1035: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1036: if (*mp)
1037: mp = &(*mp)->m_next;
1038: }
1039: /* IN6P_NEXTHOP - for outgoing packet only */
1040:
1041: /*
1042: * IPV6_HOPOPTS socket option. We require super-user privilege
1043: * for the option, but it might be too strict, since there might
1044: * be some hop-by-hop options which can be returned to normal user.
1045: * See RFC 2292 section 6.
1046: */
1.8.2.1 bouyer 1047: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1048: /*
1049: * Check if a hop-by-hop options header is contatined in the
1050: * received packet, and if so, store the options as ancillary
1051: * data. Note that a hop-by-hop options header must be
1052: * just after the IPv6 header, which fact is assured through
1053: * the IPv6 input processing.
1054: */
1055: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1056: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 1057: struct ip6_hbh *hbh;
1058: int hbhlen;
1059:
1060: #ifndef PULLDOWN_TEST
1061: hbh = (struct ip6_hbh *)(ip6 + 1);
1062: hbhlen = (hbh->ip6h_len + 1) << 3;
1063: #else
1064: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1065: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1066: if (hbh == NULL) {
1067: ip6stat.ip6s_tooshort++;
1068: return;
1069: }
1070: hbhlen = (hbh->ip6h_len + 1) << 3;
1071: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1072: sizeof(struct ip6_hdr), hbhlen);
1073: if (hbh == NULL) {
1074: ip6stat.ip6s_tooshort++;
1075: return;
1076: }
1077: #endif
1.2 itojun 1078:
1079: /*
1080: * XXX: We copy whole the header even if a jumbo
1081: * payload option is included, which option is to
1082: * be removed before returning in the RFC 2292.
1083: * But it's too painful operation...
1084: */
1.8.2.1 bouyer 1085: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1086: IPV6_HOPOPTS, IPPROTO_IPV6);
1087: if (*mp)
1088: mp = &(*mp)->m_next;
1089: }
1090: }
1091:
1092: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1093: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1094: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1095: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1096:
1097: /*
1098: * Search for destination options headers or routing
1099: * header(s) through the header chain, and stores each
1100: * header as ancillary data.
1101: * Note that the order of the headers remains in
1102: * the chain of ancillary data.
1103: */
1104: while(1) { /* is explicit loop prevention necessary? */
1.8.2.1 bouyer 1105: struct ip6_ext *ip6e;
1106: int elen;
1107:
1108: #ifndef PULLDOWN_TEST
1109: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1110: if (nxt == IPPROTO_AH)
1111: elen = (ip6e->ip6e_len + 2) << 2;
1112: else
1113: elen = (ip6e->ip6e_len + 1) << 3;
1114: #else
1115: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1116: sizeof(struct ip6_ext));
1117: if (ip6e == NULL) {
1118: ip6stat.ip6s_tooshort++;
1119: return;
1120: }
1121: if (nxt == IPPROTO_AH)
1122: elen = (ip6e->ip6e_len + 2) << 2;
1123: else
1124: elen = (ip6e->ip6e_len + 1) << 3;
1125: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1126: if (ip6e == NULL) {
1127: ip6stat.ip6s_tooshort++;
1128: return;
1129: }
1130: #endif
1.2 itojun 1131:
1132: switch(nxt) {
1133: case IPPROTO_DSTOPTS:
1134: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1135: break;
1136:
1137: /*
1138: * We also require super-user privilege for
1139: * the option.
1140: * See the comments on IN6_HOPOPTS.
1141: */
1.8.2.1 bouyer 1142: if (!privileged)
1.2 itojun 1143: break;
1144:
1.8.2.1 bouyer 1145: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1146: IPV6_DSTOPTS,
1147: IPPROTO_IPV6);
1148: if (*mp)
1149: mp = &(*mp)->m_next;
1150: break;
1151:
1152: case IPPROTO_ROUTING:
1153: if (!in6p->in6p_flags & IN6P_RTHDR)
1154: break;
1155:
1.8.2.1 bouyer 1156: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1157: IPV6_RTHDR,
1158: IPPROTO_IPV6);
1159: if (*mp)
1160: mp = &(*mp)->m_next;
1161: break;
1162:
1163: case IPPROTO_UDP:
1164: case IPPROTO_TCP:
1165: case IPPROTO_ICMPV6:
1166: default:
1167: /*
1168: * stop search if we encounter an upper
1169: * layer protocol headers.
1170: */
1171: goto loopend;
1172:
1173: case IPPROTO_HOPOPTS:
1174: case IPPROTO_AH: /* is it possible? */
1175: break;
1176: }
1177:
1178: /* proceed with the next header. */
1.8.2.1 bouyer 1179: off += elen;
1.2 itojun 1180: nxt = ip6e->ip6e_nxt;
1181: }
1182: loopend:
1183: }
1.8.2.1 bouyer 1184: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1185: /* to be done */
1186: }
1.8.2.1 bouyer 1187: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1188: /* to be done */
1189: }
1190: /* IN6P_RTHDR - to be done */
1191:
1192: }
1193:
1194: /*
1195: * Get pointer to the previous header followed by the header
1196: * currently processed.
1197: * XXX: This function supposes that
1198: * M includes all headers,
1199: * the next header field and the header length field of each header
1200: * are valid, and
1201: * the sum of each header length equals to OFF.
1202: * Because of these assumptions, this function must be called very
1203: * carefully. Moreover, it will not be used in the near future when
1204: * we develop `neater' mechanism to process extension headers.
1205: */
1206: char *
1207: ip6_get_prevhdr(m, off)
1208: struct mbuf *m;
1209: int off;
1210: {
1211: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1212:
1213: if (off == sizeof(struct ip6_hdr))
1214: return(&ip6->ip6_nxt);
1215: else {
1216: int len, nxt;
1217: struct ip6_ext *ip6e = NULL;
1218:
1219: nxt = ip6->ip6_nxt;
1220: len = sizeof(struct ip6_hdr);
1221: while (len < off) {
1222: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1223:
1224: switch(nxt) {
1225: case IPPROTO_FRAGMENT:
1226: len += sizeof(struct ip6_frag);
1227: break;
1228: case IPPROTO_AH:
1229: len += (ip6e->ip6e_len + 2) << 2;
1230: break;
1231: default:
1232: len += (ip6e->ip6e_len + 1) << 3;
1233: break;
1234: }
1235: nxt = ip6e->ip6e_nxt;
1236: }
1237: if (ip6e)
1238: return(&ip6e->ip6e_nxt);
1239: else
1240: return NULL;
1241: }
1242: }
1243:
1244: /*
1.8.2.1 bouyer 1245: * get next header offset. m will be retained.
1246: */
1247: int
1248: ip6_nexthdr(m, off, proto, nxtp)
1249: struct mbuf *m;
1250: int off;
1251: int proto;
1252: int *nxtp;
1253: {
1254: struct ip6_hdr ip6;
1255: struct ip6_ext ip6e;
1256: struct ip6_frag fh;
1257:
1258: /* just in case */
1259: if (m == NULL)
1260: panic("ip6_nexthdr: m == NULL");
1261: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1262: return -1;
1263:
1264: switch (proto) {
1265: case IPPROTO_IPV6:
1266: if (m->m_pkthdr.len < off + sizeof(ip6))
1267: return -1;
1268: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1269: if (nxtp)
1270: *nxtp = ip6.ip6_nxt;
1271: off += sizeof(ip6);
1272: return off;
1273:
1274: case IPPROTO_FRAGMENT:
1275: /*
1276: * terminate parsing if it is not the first fragment,
1277: * it does not make sense to parse through it.
1278: */
1279: if (m->m_pkthdr.len < off + sizeof(fh))
1280: return -1;
1281: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1282: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1283: return -1;
1284: if (nxtp)
1285: *nxtp = fh.ip6f_nxt;
1286: off += sizeof(struct ip6_frag);
1287: return off;
1288:
1289: case IPPROTO_AH:
1290: if (m->m_pkthdr.len < off + sizeof(ip6e))
1291: return -1;
1292: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1293: if (nxtp)
1294: *nxtp = ip6e.ip6e_nxt;
1295: off += (ip6e.ip6e_len + 2) << 2;
1296: return off;
1297:
1298: case IPPROTO_HOPOPTS:
1299: case IPPROTO_ROUTING:
1300: case IPPROTO_DSTOPTS:
1301: if (m->m_pkthdr.len < off + sizeof(ip6e))
1302: return -1;
1303: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1304: if (nxtp)
1305: *nxtp = ip6e.ip6e_nxt;
1306: off += (ip6e.ip6e_len + 1) << 3;
1307: return off;
1308:
1309: case IPPROTO_NONE:
1310: case IPPROTO_ESP:
1311: case IPPROTO_IPCOMP:
1312: /* give up */
1313: return -1;
1314:
1315: default:
1316: return -1;
1317: }
1318:
1319: return -1;
1320: }
1321:
1322: /*
1323: * get offset for the last header in the chain. m will be kept untainted.
1324: */
1325: int
1326: ip6_lasthdr(m, off, proto, nxtp)
1327: struct mbuf *m;
1328: int off;
1329: int proto;
1330: int *nxtp;
1331: {
1332: int newoff;
1333: int nxt;
1334:
1335: if (!nxtp) {
1336: nxt = -1;
1337: nxtp = &nxt;
1338: }
1339: while (1) {
1340: newoff = ip6_nexthdr(m, off, proto, nxtp);
1341: if (newoff < 0)
1342: return off;
1343: else if (newoff < off)
1344: return -1; /* invalid */
1345: else if (newoff == off)
1346: return newoff;
1347:
1348: off = newoff;
1349: proto = *nxtp;
1350: }
1351: }
1352:
1353: /*
1.2 itojun 1354: * System control for IP6
1355: */
1356:
1357: u_char inet6ctlerrmap[PRC_NCMDS] = {
1358: 0, 0, 0, 0,
1359: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1360: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1361: EMSGSIZE, EHOSTUNREACH, 0, 0,
1362: 0, 0, 0, 0,
1363: ENOPROTOOPT
1364: };
1365:
1.8.2.1 bouyer 1366: #include <uvm/uvm_extern.h>
1.2 itojun 1367: #include <sys/sysctl.h>
1368:
1369: int
1370: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1371: int *name;
1372: u_int namelen;
1373: void *oldp;
1374: size_t *oldlenp;
1375: void *newp;
1376: size_t newlen;
1377: {
1.8.2.1 bouyer 1378: int old, error;
1379:
1.2 itojun 1380: /* All sysctl names at this level are terminal. */
1381: if (namelen != 1)
1382: return ENOTDIR;
1383:
1384: switch (name[0]) {
1385:
1386: case IPV6CTL_FORWARDING:
1387: return sysctl_int(oldp, oldlenp, newp, newlen,
1388: &ip6_forwarding);
1389: case IPV6CTL_SENDREDIRECTS:
1390: return sysctl_int(oldp, oldlenp, newp, newlen,
1391: &ip6_sendredirects);
1392: case IPV6CTL_DEFHLIM:
1393: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1394: case IPV6CTL_MAXFRAGPACKETS:
1395: return sysctl_int(oldp, oldlenp, newp, newlen,
1396: &ip6_maxfragpackets);
1397: case IPV6CTL_ACCEPT_RTADV:
1398: return sysctl_int(oldp, oldlenp, newp, newlen,
1399: &ip6_accept_rtadv);
1400: case IPV6CTL_KEEPFAITH:
1401: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1402: case IPV6CTL_LOG_INTERVAL:
1403: return sysctl_int(oldp, oldlenp, newp, newlen,
1404: &ip6_log_interval);
1405: case IPV6CTL_HDRNESTLIMIT:
1406: return sysctl_int(oldp, oldlenp, newp, newlen,
1407: &ip6_hdrnestlimit);
1408: case IPV6CTL_DAD_COUNT:
1409: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1410: case IPV6CTL_AUTO_FLOWLABEL:
1411: return sysctl_int(oldp, oldlenp, newp, newlen,
1412: &ip6_auto_flowlabel);
1413: case IPV6CTL_DEFMCASTHLIM:
1414: return sysctl_int(oldp, oldlenp, newp, newlen,
1415: &ip6_defmcasthlim);
1416: case IPV6CTL_GIF_HLIM:
1417: return sysctl_int(oldp, oldlenp, newp, newlen,
1418: &ip6_gif_hlim);
1419: case IPV6CTL_KAME_VERSION:
1420: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.8.2.1 bouyer 1421: case IPV6CTL_USE_DEPRECATED:
1422: return sysctl_int(oldp, oldlenp, newp, newlen,
1423: &ip6_use_deprecated);
1424: case IPV6CTL_RR_PRUNE:
1425: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1426: #ifndef INET6_BINDV6ONLY
1427: case IPV6CTL_BINDV6ONLY:
1428: return sysctl_int(oldp, oldlenp, newp, newlen,
1429: &ip6_bindv6only);
1430: #endif
1431: case IPV6CTL_ANONPORTMIN:
1432: old = ip6_anonportmin;
1433: error = sysctl_int(oldp, oldlenp, newp, newlen,
1434: &ip6_anonportmin);
1435: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1436: ip6_anonportmin > 65535
1437: #ifndef IPNOPRIVPORTS
1438: || ip6_anonportmin < IPV6PORT_RESERVED
1439: #endif
1440: ) {
1441: ip6_anonportmin = old;
1442: return (EINVAL);
1443: }
1444: return (error);
1445: case IPV6CTL_ANONPORTMAX:
1446: old = ip6_anonportmax;
1447: error = sysctl_int(oldp, oldlenp, newp, newlen,
1448: &ip6_anonportmax);
1449: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1450: ip6_anonportmax > 65535
1451: #ifndef IPNOPRIVPORTS
1452: || ip6_anonportmax < IPV6PORT_RESERVED
1453: #endif
1454: ) {
1455: ip6_anonportmax = old;
1456: return (EINVAL);
1457: }
1458: return (error);
1459: #ifndef IPNOPRIVPORTS
1460: case IPV6CTL_LOWPORTMIN:
1461: old = ip6_lowportmin;
1462: error = sysctl_int(oldp, oldlenp, newp, newlen,
1463: &ip6_lowportmin);
1464: if (ip6_lowportmin >= ip6_lowportmax ||
1465: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1466: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1467: ip6_lowportmin = old;
1468: return (EINVAL);
1469: }
1470: return (error);
1471: case IPV6CTL_LOWPORTMAX:
1472: old = ip6_lowportmax;
1473: error = sysctl_int(oldp, oldlenp, newp, newlen,
1474: &ip6_lowportmax);
1475: if (ip6_lowportmin >= ip6_lowportmax ||
1476: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1477: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1478: ip6_lowportmax = old;
1479: return (EINVAL);
1480: }
1481: return (error);
1482: #endif
1.2 itojun 1483: default:
1484: return EOPNOTSUPP;
1485: }
1486: /* NOTREACHED */
1487: }
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