Annotation of src/sys/netinet6/ip6_input.c, Revision 1.8.2.6
1.8.2.5 bouyer 1: /* $NetBSD$ */
2: /* $KAME: ip6_input.c,v 1.183 2001/03/01 15:15:23 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:
1.8.2.5 bouyer 110: #ifdef IPSEC
111: #include <netinet6/ipsec.h>
112: #endif
113:
1.2 itojun 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:
1.8.2.2 bouyer 137: #ifdef PFIL_HOOKS
138: struct pfil_head inet6_pfil_hook;
139: #endif
140:
1.2 itojun 141: struct ip6stat ip6stat;
142:
143: static void ip6_init2 __P((void *));
144:
1.5 itojun 145: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 146:
147: /*
148: * IP6 initialization: fill in IP6 protocol switch table.
149: * All protocols not implemented in kernel go to raw IP6 protocol handler.
150: */
151: void
152: ip6_init()
153: {
1.8.2.4 bouyer 154: struct ip6protosw *pr;
155: int i;
1.2 itojun 156: struct timeval tv;
157:
158: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
159: if (pr == 0)
160: panic("ip6_init");
161: for (i = 0; i < IPPROTO_MAX; i++)
162: ip6_protox[i] = pr - inet6sw;
163: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
164: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
165: if (pr->pr_domain->dom_family == PF_INET6 &&
166: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
167: ip6_protox[pr->pr_protocol] = pr - inet6sw;
168: ip6intrq.ifq_maxlen = ip6qmaxlen;
169: nd6_init();
170: frag6_init();
171: /*
172: * in many cases, random() here does NOT return random number
173: * as initialization during bootstrap time occur in fixed order.
174: */
175: microtime(&tv);
176: ip6_flow_seq = random() ^ tv.tv_usec;
177:
178: ip6_init2((void *)0);
1.8.2.2 bouyer 179:
180: #ifdef PFIL_HOOKS
181: /* Register our Packet Filter hook. */
1.8.2.3 bouyer 182: inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
183: inet6_pfil_hook.ph_af = AF_INET6;
1.8.2.2 bouyer 184: i = pfil_head_register(&inet6_pfil_hook);
185: if (i != 0)
186: printf("ip6_init: WARNING: unable to register pfil hook, "
187: "error %d\n", i);
188: #endif /* PFIL_HOOKS */
1.2 itojun 189: }
190:
191: static void
192: ip6_init2(dummy)
193: void *dummy;
194: {
195: /*
196: * to route local address of p2p link to loopback,
1.8.2.1 bouyer 197: * assign loopback address first.
1.2 itojun 198: */
1.8.2.1 bouyer 199: in6_ifattach(&loif[0], NULL);
1.2 itojun 200:
201: /* nd6_timer_init */
1.8.2.1 bouyer 202: callout_init(&nd6_timer_ch);
203: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
204: /* router renumbering prefix list maintenance */
205: callout_init(&in6_rr_timer_ch);
206: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 207: }
208:
209: /*
210: * IP6 input interrupt handling. Just pass the packet to ip6_input.
211: */
212: void
213: ip6intr()
214: {
215: int s;
216: struct mbuf *m;
217:
218: for (;;) {
219: s = splimp();
220: IF_DEQUEUE(&ip6intrq, m);
221: splx(s);
222: if (m == 0)
223: return;
224: ip6_input(m);
225: }
226: }
227:
228: extern struct route_in6 ip6_forward_rt;
229:
230: void
231: ip6_input(m)
232: struct mbuf *m;
233: {
1.8.2.1 bouyer 234: struct ip6_hdr *ip6;
1.2 itojun 235: int off = sizeof(struct ip6_hdr), nest;
236: u_int32_t plen;
1.5 itojun 237: u_int32_t rtalert = ~0;
1.2 itojun 238: int nxt, ours = 0;
1.8.2.1 bouyer 239: struct ifnet *deliverifp = NULL;
1.2 itojun 240:
241: #ifdef IPSEC
242: /*
243: * should the inner packet be considered authentic?
244: * see comment in ah4_input().
245: */
246: if (m) {
247: m->m_flags &= ~M_AUTHIPHDR;
248: m->m_flags &= ~M_AUTHIPDGM;
249: }
250: #endif
1.8.2.1 bouyer 251:
1.2 itojun 252: /*
253: * mbuf statistics by kazu
254: */
255: if (m->m_flags & M_EXT) {
256: if (m->m_next)
257: ip6stat.ip6s_mext2m++;
258: else
259: ip6stat.ip6s_mext1++;
260: } else {
261: if (m->m_next) {
1.8.2.1 bouyer 262: if (m->m_flags & M_LOOP) {
1.2 itojun 263: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.8.2.1 bouyer 264: } else if (m->m_pkthdr.rcvif->if_index <= 31)
1.2 itojun 265: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
266: else
267: ip6stat.ip6s_m2m[0]++;
268: } else
269: ip6stat.ip6s_m1++;
270: }
271:
1.8.2.1 bouyer 272: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.2 itojun 273: ip6stat.ip6s_total++;
274:
1.8.2.1 bouyer 275: #ifndef PULLDOWN_TEST
276: /* XXX is the line really necessary? */
277: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
278: #endif
279:
280: if (m->m_len < sizeof(struct ip6_hdr)) {
281: struct ifnet *inifp;
282: inifp = m->m_pkthdr.rcvif;
283: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
284: ip6stat.ip6s_toosmall++;
285: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
286: return;
287: }
1.2 itojun 288: }
289:
290: ip6 = mtod(m, struct ip6_hdr *);
291:
292: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
293: ip6stat.ip6s_badvers++;
1.8.2.1 bouyer 294: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 295: goto bad;
296: }
297:
1.8.2.1 bouyer 298: #ifdef PFIL_HOOKS
299: /*
300: * Run through list of hooks for input packets. If there are any
301: * filters which require that additional packets in the flow are
302: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
303: * Note that filters must _never_ set this flag, as another filter
304: * in the list may have previously cleared it.
305: */
1.8.2.6 ! bouyer 306: /*
! 307: * let ipfilter look at packet on the wire,
! 308: * not the decapsulated packet.
! 309: */
! 310: #ifdef IPSEC
! 311: if (!ipsec_gethist(m, NULL))
! 312: #else
! 313: if (1)
! 314: #endif
! 315: {
! 316: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
! 317: PFIL_IN) != 0)
! 318: return;
! 319: if (m == NULL)
! 320: return;
! 321: ip6 = mtod(m, struct ip6_hdr *);
! 322: }
1.8.2.1 bouyer 323: #endif /* PFIL_HOOKS */
324:
325:
1.2 itojun 326: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
327:
1.8.2.3 bouyer 328: #ifdef ALTQ
329: /* XXX Temporary until ALTQ is changed to use a pfil hook */
330: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
331: /* packet is dropped by traffic conditioner */
332: return;
1.8.2.1 bouyer 333: }
334: #endif
335:
1.2 itojun 336: /*
337: * Scope check
338: */
339: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
340: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
341: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 342: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 343: goto bad;
344: }
1.8.2.1 bouyer 345: /*
346: * The following check is not documented in the spec. Malicious party
347: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
348: * bypass security checks (act as if it was from 127.0.0.1 by using
349: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.8.2.4 bouyer 350: *
351: * This check chokes if we are in SIIT cloud. As none of BSDs support
352: * IPv4-less kernel compilation, we cannot support SIIT environment
353: * at all. So, it makes more sense for us to reject any malicious
354: * packets for non-SIIT environment, than try to do a partical support
355: * for SIIT environment.
1.8.2.1 bouyer 356: */
357: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
358: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
359: ip6stat.ip6s_badscope++;
360: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
361: goto bad;
362: }
363: #if 0
364: /*
365: * Reject packets with IPv4 compatible addresses (auto tunnel).
366: *
367: * The code forbids auto tunnel relay case in RFC1933 (the check is
368: * stronger than RFC1933). We may want to re-enable it if mech-xx
369: * is revised to forbid relaying case.
370: */
371: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
372: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
373: ip6stat.ip6s_badscope++;
374: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
375: goto bad;
376: }
377: #endif
1.8.2.4 bouyer 378:
1.2 itojun 379: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
380: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
381: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
382: ours = 1;
1.8.2.1 bouyer 383: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 384: goto hbhcheck;
385: } else {
386: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 387: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 388: goto bad;
389: }
390: }
391:
1.8.2.6 ! bouyer 392: /* drop packets if interface ID portion is already filled */
! 393: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
! 394: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
! 395: ip6->ip6_src.s6_addr16[1]) {
! 396: ip6stat.ip6s_badscope++;
! 397: goto bad;
! 398: }
! 399: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
! 400: ip6->ip6_dst.s6_addr16[1]) {
! 401: ip6stat.ip6s_badscope++;
! 402: goto bad;
! 403: }
! 404: }
! 405:
1.8.2.1 bouyer 406: #ifndef FAKE_LOOPBACK_IF
407: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
408: #else
409: if (1)
410: #endif
411: {
1.2 itojun 412: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
413: ip6->ip6_src.s6_addr16[1]
414: = htons(m->m_pkthdr.rcvif->if_index);
415: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
416: ip6->ip6_dst.s6_addr16[1]
417: = htons(m->m_pkthdr.rcvif->if_index);
418: }
419:
420: /*
1.8.2.1 bouyer 421: * XXX we need this since we do not have "goto ours" hack route
422: * for some of our ifaddrs on loopback interface.
423: * we should correct it by changing in6_ifattach to install
424: * "goto ours" hack route.
425: */
426: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
427: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
428: ours = 1;
429: deliverifp = m->m_pkthdr.rcvif;
430: goto hbhcheck;
431: }
432: }
433:
434: /*
1.2 itojun 435: * Multicast check
436: */
437: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
438: struct in6_multi *in6m = 0;
1.8.2.1 bouyer 439:
440: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 441: /*
442: * See if we belong to the destination multicast group on the
443: * arrival interface.
444: */
445: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
446: if (in6m)
447: ours = 1;
448: else if (!ip6_mrouter) {
449: ip6stat.ip6s_notmember++;
450: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 451: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 452: goto bad;
453: }
1.8.2.1 bouyer 454: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 455: goto hbhcheck;
456: }
457:
458: /*
459: * Unicast check
460: */
1.8.2.1 bouyer 461: if (ip6_forward_rt.ro_rt != NULL &&
462: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
463: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.8.2.4 bouyer 464: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.8.2.1 bouyer 465: ip6stat.ip6s_forward_cachehit++;
466: else {
1.8.2.4 bouyer 467: struct sockaddr_in6 *dst6;
468:
1.2 itojun 469: if (ip6_forward_rt.ro_rt) {
1.8.2.1 bouyer 470: /* route is down or destination is different */
471: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 472: RTFREE(ip6_forward_rt.ro_rt);
473: ip6_forward_rt.ro_rt = 0;
474: }
1.8.2.1 bouyer 475:
1.2 itojun 476: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.8.2.4 bouyer 477: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
478: dst6->sin6_len = sizeof(struct sockaddr_in6);
479: dst6->sin6_family = AF_INET6;
480: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 481:
482: rtalloc((struct route *)&ip6_forward_rt);
483: }
484:
485: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
486:
487: /*
488: * Accept the packet if the forwarding interface to the destination
489: * according to the routing table is the loopback interface,
490: * unless the associated route has a gateway.
491: * Note that this approach causes to accept a packet if there is a
492: * route to the loopback interface for the destination of the packet.
493: * But we think it's even useful in some situations, e.g. when using
494: * a special daemon which wants to intercept the packet.
495: */
496: if (ip6_forward_rt.ro_rt &&
497: (ip6_forward_rt.ro_rt->rt_flags &
498: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
499: #if 0
500: /*
501: * The check below is redundant since the comparison of
502: * the destination and the key of the rtentry has
503: * already done through looking up the routing table.
504: */
505: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
506: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
507: #endif
1.8.2.1 bouyer 508: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 509: struct in6_ifaddr *ia6 =
510: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
511: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
512: m->m_flags |= M_ANYCAST6;
1.8.2.1 bouyer 513: /*
514: * packets to a tentative, duplicated, or somehow invalid
515: * address must not be accepted.
516: */
1.2 itojun 517: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.8.2.1 bouyer 518: /* this address is ready */
1.2 itojun 519: ours = 1;
1.8.2.1 bouyer 520: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 521: goto hbhcheck;
522: } else {
1.8.2.1 bouyer 523: /* address is not ready, so discard the packet. */
1.8.2.4 bouyer 524: nd6log((LOG_INFO,
1.8.2.1 bouyer 525: "ip6_input: packet to an unready address %s->%s\n",
526: ip6_sprintf(&ip6->ip6_src),
1.8.2.4 bouyer 527: ip6_sprintf(&ip6->ip6_dst)));
1.8.2.1 bouyer 528:
529: goto bad;
1.2 itojun 530: }
531: }
532:
533: /*
534: * FAITH(Firewall Aided Internet Translator)
535: */
536: #if defined(NFAITH) && 0 < NFAITH
537: if (ip6_keepfaith) {
538: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
539: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
540: /* XXX do we need more sanity checks? */
541: ours = 1;
1.8.2.1 bouyer 542: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
543: goto hbhcheck;
544: }
545: }
546: #endif
547:
548: #if 0
549: {
550: /*
551: * Last resort: check in6_ifaddr for incoming interface.
552: * The code is here until I update the "goto ours hack" code above
553: * working right.
554: */
555: struct ifaddr *ifa;
556: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
557: ifa;
558: ifa = ifa->ifa_list.tqe_next) {
559: if (ifa->ifa_addr == NULL)
560: continue; /* just for safety */
561: if (ifa->ifa_addr->sa_family != AF_INET6)
562: continue;
563: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
564: ours = 1;
565: deliverifp = ifa->ifa_ifp;
1.2 itojun 566: goto hbhcheck;
567: }
568: }
1.8.2.1 bouyer 569: }
1.2 itojun 570: #endif
571:
572: /*
573: * Now there is no reason to process the packet if it's not our own
574: * and we're not a router.
575: */
576: if (!ip6_forwarding) {
577: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 578: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 579: goto bad;
580: }
581:
582: hbhcheck:
583: /*
584: * Process Hop-by-Hop options header if it's contained.
585: * m may be modified in ip6_hopopts_input().
586: * If a JumboPayload option is included, plen will also be modified.
587: */
588: plen = (u_int32_t)ntohs(ip6->ip6_plen);
589: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 590: struct ip6_hbh *hbh;
591:
592: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
593: #if 0 /*touches NULL pointer*/
594: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
595: #endif
1.2 itojun 596: return; /* m have already been freed */
1.8.2.1 bouyer 597: }
598:
1.2 itojun 599: /* adjust pointer */
600: ip6 = mtod(m, struct ip6_hdr *);
1.8.2.1 bouyer 601:
602: /*
603: * if the payload length field is 0 and the next header field
604: * indicates Hop-by-Hop Options header, then a Jumbo Payload
605: * option MUST be included.
606: */
607: if (ip6->ip6_plen == 0 && plen == 0) {
608: /*
609: * Note that if a valid jumbo payload option is
610: * contained, ip6_hoptops_input() must set a valid
611: * (non-zero) payload length to the variable plen.
612: */
613: ip6stat.ip6s_badoptions++;
614: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
615: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
616: icmp6_error(m, ICMP6_PARAM_PROB,
617: ICMP6_PARAMPROB_HEADER,
618: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
619: return;
620: }
621: #ifndef PULLDOWN_TEST
622: /* ip6_hopopts_input() ensures that mbuf is contiguous */
623: hbh = (struct ip6_hbh *)(ip6 + 1);
624: #else
625: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
626: sizeof(struct ip6_hbh));
627: if (hbh == NULL) {
628: ip6stat.ip6s_tooshort++;
629: return;
630: }
631: #endif
632: nxt = hbh->ip6h_nxt;
1.2 itojun 633:
634: /*
635: * accept the packet if a router alert option is included
636: * and we act as an IPv6 router.
637: */
1.5 itojun 638: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 639: ours = 1;
640: } else
641: nxt = ip6->ip6_nxt;
642:
643: /*
644: * Check that the amount of data in the buffers
645: * is as at least much as the IPv6 header would have us expect.
646: * Trim mbufs if longer than we expect.
647: * Drop packet if shorter than we expect.
648: */
649: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
650: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 651: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 652: goto bad;
653: }
654: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
655: if (m->m_len == m->m_pkthdr.len) {
656: m->m_len = sizeof(struct ip6_hdr) + plen;
657: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
658: } else
659: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
660: }
661:
662: /*
663: * Forward if desirable.
664: */
665: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
666: /*
667: * If we are acting as a multicast router, all
668: * incoming multicast packets are passed to the
669: * kernel-level multicast forwarding function.
670: * The packet is returned (relatively) intact; if
671: * ip6_mforward() returns a non-zero value, the packet
672: * must be discarded, else it may be accepted below.
673: */
674: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
675: ip6stat.ip6s_cantforward++;
676: m_freem(m);
677: return;
678: }
679: if (!ours) {
680: m_freem(m);
681: return;
682: }
1.8.2.1 bouyer 683: } else if (!ours) {
1.2 itojun 684: ip6_forward(m, 0);
685: return;
686: }
687:
1.8.2.1 bouyer 688: ip6 = mtod(m, struct ip6_hdr *);
689:
690: /*
691: * Malicious party may be able to use IPv4 mapped addr to confuse
692: * tcp/udp stack and bypass security checks (act as if it was from
693: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
694: *
695: * For SIIT end node behavior, you may want to disable the check.
696: * However, you will become vulnerable to attacks using IPv4 mapped
697: * source.
698: */
699: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
700: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
701: ip6stat.ip6s_badscope++;
702: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
703: goto bad;
704: }
705:
1.2 itojun 706: /*
707: * Tell launch routine the next header
708: */
1.8.2.1 bouyer 709: #ifdef IFA_STATS
710: if (deliverifp != NULL) {
711: struct in6_ifaddr *ia6;
712: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
713: if (ia6)
714: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
715: }
716: #endif
1.2 itojun 717: ip6stat.ip6s_delivered++;
1.8.2.1 bouyer 718: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 719: nest = 0;
720: while (nxt != IPPROTO_DONE) {
721: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
722: ip6stat.ip6s_toomanyhdr++;
723: goto bad;
724: }
1.8 itojun 725:
726: /*
727: * protection against faulty packet - there should be
728: * more sanity checks in header chain processing.
729: */
730: if (m->m_pkthdr.len < off) {
731: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 732: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 733: goto bad;
734: }
735:
1.8.2.5 bouyer 736: #ifdef IPSEC
737: /*
738: * enforce IPsec policy checking if we are seeing last header.
739: * note that we do not visit this with protocols with pcb layer
740: * code - like udp/tcp/raw ip.
741: */
742: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
743: ipsec6_in_reject(m, NULL)) {
744: ipsec6stat.in_polvio++;
745: goto bad;
746: }
747: #endif
748:
1.2 itojun 749: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
750: }
751: return;
752: bad:
753: m_freem(m);
754: }
755:
756: /*
757: * Hop-by-Hop options header processing. If a valid jumbo payload option is
758: * included, the real payload length will be stored in plenp.
759: */
760: static int
761: ip6_hopopts_input(plenp, rtalertp, mp, offp)
762: u_int32_t *plenp;
1.5 itojun 763: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 764: struct mbuf **mp;
765: int *offp;
766: {
1.8.2.4 bouyer 767: struct mbuf *m = *mp;
1.2 itojun 768: int off = *offp, hbhlen;
769: struct ip6_hbh *hbh;
770: u_int8_t *opt;
771:
772: /* validation of the length of the header */
1.8.2.1 bouyer 773: #ifndef PULLDOWN_TEST
1.2 itojun 774: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
775: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
776: hbhlen = (hbh->ip6h_len + 1) << 3;
777:
778: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
779: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.8.2.1 bouyer 780: #else
781: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
782: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
783: if (hbh == NULL) {
784: ip6stat.ip6s_tooshort++;
785: return -1;
786: }
787: hbhlen = (hbh->ip6h_len + 1) << 3;
788: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
789: hbhlen);
790: if (hbh == NULL) {
791: ip6stat.ip6s_tooshort++;
792: return -1;
793: }
794: #endif
1.2 itojun 795: off += hbhlen;
796: hbhlen -= sizeof(struct ip6_hbh);
797: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
798:
799: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
800: hbhlen, rtalertp, plenp) < 0)
801: return(-1);
802:
803: *offp = off;
804: *mp = m;
805: return(0);
806: }
807:
808: /*
809: * Search header for all Hop-by-hop options and process each option.
810: * This function is separate from ip6_hopopts_input() in order to
811: * handle a case where the sending node itself process its hop-by-hop
812: * options header. In such a case, the function is called from ip6_output().
813: */
814: int
815: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
816: struct mbuf *m;
817: u_int8_t *opthead;
818: int hbhlen;
1.5 itojun 819: u_int32_t *rtalertp;
1.2 itojun 820: u_int32_t *plenp;
821: {
822: struct ip6_hdr *ip6;
823: int optlen = 0;
824: u_int8_t *opt = opthead;
825: u_int16_t rtalert_val;
1.8.2.1 bouyer 826: u_int32_t jumboplen;
1.2 itojun 827:
828: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.8.2.4 bouyer 829: switch (*opt) {
830: case IP6OPT_PAD1:
831: optlen = 1;
832: break;
833: case IP6OPT_PADN:
834: if (hbhlen < IP6OPT_MINLEN) {
835: ip6stat.ip6s_toosmall++;
836: goto bad;
837: }
838: optlen = *(opt + 1) + 2;
839: break;
840: case IP6OPT_RTALERT:
1.8.2.1 bouyer 841: /* XXX may need check for alignment */
1.8.2.4 bouyer 842: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.8.2.1 bouyer 843: ip6stat.ip6s_toosmall++;
844: goto bad;
845: }
1.8.2.4 bouyer 846: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.8.2.1 bouyer 847: /* XXX: should we discard the packet? */
1.8.2.4 bouyer 848: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
849: *(opt + 1));
850: }
851: optlen = IP6OPT_RTALERT_LEN;
852: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
853: *rtalertp = ntohs(rtalert_val);
854: break;
855: case IP6OPT_JUMBO:
856: /* XXX may need check for alignment */
857: if (hbhlen < IP6OPT_JUMBO_LEN) {
858: ip6stat.ip6s_toosmall++;
859: goto bad;
860: }
861: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
862: /* XXX: should we discard the packet? */
1.8.2.1 bouyer 863: log(LOG_ERR, "length of jumbopayload opt "
864: "is inconsistent(%d)\n",
865: *(opt + 1));
1.8.2.4 bouyer 866: }
1.8.2.1 bouyer 867: optlen = IP6OPT_JUMBO_LEN;
1.2 itojun 868:
1.8.2.1 bouyer 869: /*
870: * IPv6 packets that have non 0 payload length
1.8.2.4 bouyer 871: * must not contain a jumbo payload option.
1.8.2.1 bouyer 872: */
873: ip6 = mtod(m, struct ip6_hdr *);
874: if (ip6->ip6_plen) {
875: ip6stat.ip6s_badoptions++;
876: icmp6_error(m, ICMP6_PARAM_PROB,
877: ICMP6_PARAMPROB_HEADER,
878: sizeof(struct ip6_hdr) +
879: sizeof(struct ip6_hbh) +
880: opt - opthead);
881: return(-1);
882: }
883:
884: /*
885: * We may see jumbolen in unaligned location, so
886: * we'd need to perform bcopy().
887: */
888: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
889: jumboplen = (u_int32_t)htonl(jumboplen);
890:
891: #if 1
892: /*
893: * if there are multiple jumbo payload options,
894: * *plenp will be non-zero and the packet will be
895: * rejected.
896: * the behavior may need some debate in ipngwg -
897: * multiple options does not make sense, however,
898: * there's no explicit mention in specification.
899: */
900: if (*plenp != 0) {
901: ip6stat.ip6s_badoptions++;
902: icmp6_error(m, ICMP6_PARAM_PROB,
903: ICMP6_PARAMPROB_HEADER,
904: sizeof(struct ip6_hdr) +
905: sizeof(struct ip6_hbh) +
906: opt + 2 - opthead);
907: return(-1);
908: }
1.8 itojun 909: #endif
1.2 itojun 910:
1.8.2.1 bouyer 911: /*
912: * jumbo payload length must be larger than 65535.
913: */
914: if (jumboplen <= IPV6_MAXPACKET) {
915: ip6stat.ip6s_badoptions++;
916: icmp6_error(m, ICMP6_PARAM_PROB,
917: ICMP6_PARAMPROB_HEADER,
918: sizeof(struct ip6_hdr) +
919: sizeof(struct ip6_hbh) +
920: opt + 2 - opthead);
921: return(-1);
922: }
923: *plenp = jumboplen;
924:
925: break;
1.8.2.4 bouyer 926: default: /* unknown option */
927: if (hbhlen < IP6OPT_MINLEN) {
928: ip6stat.ip6s_toosmall++;
929: goto bad;
930: }
931: if ((optlen = ip6_unknown_opt(opt, m,
932: sizeof(struct ip6_hdr) +
933: sizeof(struct ip6_hbh) +
934: opt - opthead)) == -1)
935: return(-1);
936: optlen += 2;
937: break;
1.2 itojun 938: }
939: }
940:
941: return(0);
942:
943: bad:
944: m_freem(m);
945: return(-1);
946: }
947:
948: /*
949: * Unknown option processing.
950: * The third argument `off' is the offset from the IPv6 header to the option,
951: * which is necessary if the IPv6 header the and option header and IPv6 header
952: * is not continuous in order to return an ICMPv6 error.
953: */
954: int
955: ip6_unknown_opt(optp, m, off)
956: u_int8_t *optp;
957: struct mbuf *m;
958: int off;
959: {
960: struct ip6_hdr *ip6;
961:
1.8.2.4 bouyer 962: switch (IP6OPT_TYPE(*optp)) {
963: case IP6OPT_TYPE_SKIP: /* ignore the option */
964: return((int)*(optp + 1));
965: case IP6OPT_TYPE_DISCARD: /* silently discard */
966: m_freem(m);
967: return(-1);
968: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
969: ip6stat.ip6s_badoptions++;
970: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
971: return(-1);
972: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
973: ip6stat.ip6s_badoptions++;
974: ip6 = mtod(m, struct ip6_hdr *);
975: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
976: (m->m_flags & (M_BCAST|M_MCAST)))
977: m_freem(m);
978: else
979: icmp6_error(m, ICMP6_PARAM_PROB,
980: ICMP6_PARAMPROB_OPTION, off);
981: return(-1);
1.2 itojun 982: }
983:
984: m_freem(m); /* XXX: NOTREACHED */
985: return(-1);
986: }
987:
988: /*
1.8.2.1 bouyer 989: * Create the "control" list for this pcb.
990: *
991: * The routine will be called from upper layer handlers like tcp6_input().
992: * Thus the routine assumes that the caller (tcp6_input) have already
993: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
994: * very first mbuf on the mbuf chain.
995: * We may want to add some infinite loop prevention or sanity checks for safety.
996: * (This applies only when you are using KAME mbuf chain restriction, i.e.
997: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 998: */
999: void
1000: ip6_savecontrol(in6p, mp, ip6, m)
1.8.2.4 bouyer 1001: struct in6pcb *in6p;
1002: struct mbuf **mp;
1003: struct ip6_hdr *ip6;
1004: struct mbuf *m;
1.2 itojun 1005: {
1006: struct proc *p = curproc; /* XXX */
1.8.2.1 bouyer 1007: int privileged;
1008:
1009: privileged = 0;
1010: if (p && !suser(p->p_ucred, &p->p_acflag))
1011: privileged++;
1.2 itojun 1012:
1.8.2.1 bouyer 1013: #ifdef SO_TIMESTAMP
1.2 itojun 1014: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1015: struct timeval tv;
1016:
1017: microtime(&tv);
1018: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1019: SCM_TIMESTAMP, SOL_SOCKET);
1020: if (*mp)
1021: mp = &(*mp)->m_next;
1022: }
1.8.2.1 bouyer 1023: #endif
1.2 itojun 1024: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1025: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1026: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1027: IPPROTO_IPV6);
1028: if (*mp)
1029: mp = &(*mp)->m_next;
1030: }
1031:
1032: #ifdef noyet
1033: /* options were tossed above */
1034: if (in6p->in6p_flags & IN6P_RECVOPTS)
1035: /* broken */
1036: /* ip6_srcroute doesn't do what we want here, need to fix */
1037: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1038: /* broken */
1039: #endif
1040:
1041: /* RFC 2292 sec. 5 */
1.8.2.4 bouyer 1042: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1043: struct in6_pktinfo pi6;
1044: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1045: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1046: pi6.ipi6_addr.s6_addr16[1] = 0;
1047: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1048: ? m->m_pkthdr.rcvif->if_index
1049: : 0;
1050: *mp = sbcreatecontrol((caddr_t) &pi6,
1051: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1052: IPPROTO_IPV6);
1053: if (*mp)
1054: mp = &(*mp)->m_next;
1055: }
1056: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1057: int hlim = ip6->ip6_hlim & 0xff;
1058: *mp = sbcreatecontrol((caddr_t) &hlim,
1059: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1060: if (*mp)
1061: mp = &(*mp)->m_next;
1062: }
1063: /* IN6P_NEXTHOP - for outgoing packet only */
1064:
1065: /*
1066: * IPV6_HOPOPTS socket option. We require super-user privilege
1067: * for the option, but it might be too strict, since there might
1068: * be some hop-by-hop options which can be returned to normal user.
1069: * See RFC 2292 section 6.
1070: */
1.8.2.4 bouyer 1071: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1072: /*
1073: * Check if a hop-by-hop options header is contatined in the
1074: * received packet, and if so, store the options as ancillary
1075: * data. Note that a hop-by-hop options header must be
1076: * just after the IPv6 header, which fact is assured through
1077: * the IPv6 input processing.
1078: */
1079: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1080: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 1081: struct ip6_hbh *hbh;
1082: int hbhlen;
1083:
1084: #ifndef PULLDOWN_TEST
1085: hbh = (struct ip6_hbh *)(ip6 + 1);
1086: hbhlen = (hbh->ip6h_len + 1) << 3;
1087: #else
1088: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1089: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1090: if (hbh == NULL) {
1091: ip6stat.ip6s_tooshort++;
1092: return;
1093: }
1094: hbhlen = (hbh->ip6h_len + 1) << 3;
1095: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1096: sizeof(struct ip6_hdr), hbhlen);
1097: if (hbh == NULL) {
1098: ip6stat.ip6s_tooshort++;
1099: return;
1100: }
1101: #endif
1.2 itojun 1102:
1103: /*
1104: * XXX: We copy whole the header even if a jumbo
1105: * payload option is included, which option is to
1106: * be removed before returning in the RFC 2292.
1107: * But it's too painful operation...
1108: */
1.8.2.1 bouyer 1109: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1110: IPV6_HOPOPTS, IPPROTO_IPV6);
1111: if (*mp)
1112: mp = &(*mp)->m_next;
1113: }
1114: }
1115:
1116: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1117: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1118: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1119: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1120:
1121: /*
1122: * Search for destination options headers or routing
1123: * header(s) through the header chain, and stores each
1124: * header as ancillary data.
1125: * Note that the order of the headers remains in
1126: * the chain of ancillary data.
1127: */
1.8.2.4 bouyer 1128: while (1) { /* is explicit loop prevention necessary? */
1.8.2.1 bouyer 1129: struct ip6_ext *ip6e;
1130: int elen;
1131:
1132: #ifndef PULLDOWN_TEST
1133: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1134: if (nxt == IPPROTO_AH)
1135: elen = (ip6e->ip6e_len + 2) << 2;
1136: else
1137: elen = (ip6e->ip6e_len + 1) << 3;
1138: #else
1139: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1140: sizeof(struct ip6_ext));
1141: if (ip6e == NULL) {
1142: ip6stat.ip6s_tooshort++;
1143: return;
1144: }
1145: if (nxt == IPPROTO_AH)
1146: elen = (ip6e->ip6e_len + 2) << 2;
1147: else
1148: elen = (ip6e->ip6e_len + 1) << 3;
1149: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1150: if (ip6e == NULL) {
1151: ip6stat.ip6s_tooshort++;
1152: return;
1153: }
1154: #endif
1.2 itojun 1155:
1.8.2.4 bouyer 1156: switch (nxt) {
1157: case IPPROTO_DSTOPTS:
1158: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1159: break;
1160:
1161: /*
1162: * We also require super-user privilege for
1163: * the option.
1164: * See the comments on IN6_HOPOPTS.
1165: */
1166: if (!privileged)
1167: break;
1168:
1169: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1170: IPV6_DSTOPTS,
1171: IPPROTO_IPV6);
1172: if (*mp)
1173: mp = &(*mp)->m_next;
1174: break;
1175:
1176: case IPPROTO_ROUTING:
1177: if (!in6p->in6p_flags & IN6P_RTHDR)
1178: break;
1179:
1180: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1181: IPV6_RTHDR,
1182: IPPROTO_IPV6);
1183: if (*mp)
1184: mp = &(*mp)->m_next;
1185: break;
1186:
1187: case IPPROTO_UDP:
1188: case IPPROTO_TCP:
1189: case IPPROTO_ICMPV6:
1190: default:
1191: /*
1192: * stop search if we encounter an upper
1193: * layer protocol headers.
1194: */
1195: goto loopend;
1196:
1197: case IPPROTO_HOPOPTS:
1198: case IPPROTO_AH: /* is it possible? */
1199: break;
1.2 itojun 1200: }
1201:
1202: /* proceed with the next header. */
1.8.2.1 bouyer 1203: off += elen;
1.2 itojun 1204: nxt = ip6e->ip6e_nxt;
1205: }
1206: loopend:
1.8.2.5 bouyer 1207: ;
1.2 itojun 1208: }
1.8.2.1 bouyer 1209: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1210: /* to be done */
1211: }
1.8.2.1 bouyer 1212: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1213: /* to be done */
1214: }
1215: /* IN6P_RTHDR - to be done */
1216:
1217: }
1218:
1219: /*
1220: * Get pointer to the previous header followed by the header
1221: * currently processed.
1222: * XXX: This function supposes that
1223: * M includes all headers,
1224: * the next header field and the header length field of each header
1225: * are valid, and
1226: * the sum of each header length equals to OFF.
1227: * Because of these assumptions, this function must be called very
1228: * carefully. Moreover, it will not be used in the near future when
1229: * we develop `neater' mechanism to process extension headers.
1230: */
1231: char *
1232: ip6_get_prevhdr(m, off)
1233: struct mbuf *m;
1234: int off;
1235: {
1236: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1237:
1238: if (off == sizeof(struct ip6_hdr))
1239: return(&ip6->ip6_nxt);
1240: else {
1241: int len, nxt;
1242: struct ip6_ext *ip6e = NULL;
1243:
1244: nxt = ip6->ip6_nxt;
1245: len = sizeof(struct ip6_hdr);
1246: while (len < off) {
1247: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1248:
1.8.2.4 bouyer 1249: switch (nxt) {
1.2 itojun 1250: case IPPROTO_FRAGMENT:
1251: len += sizeof(struct ip6_frag);
1252: break;
1253: case IPPROTO_AH:
1254: len += (ip6e->ip6e_len + 2) << 2;
1255: break;
1256: default:
1257: len += (ip6e->ip6e_len + 1) << 3;
1258: break;
1259: }
1260: nxt = ip6e->ip6e_nxt;
1261: }
1262: if (ip6e)
1263: return(&ip6e->ip6e_nxt);
1264: else
1265: return NULL;
1266: }
1267: }
1268:
1269: /*
1.8.2.1 bouyer 1270: * get next header offset. m will be retained.
1271: */
1272: int
1273: ip6_nexthdr(m, off, proto, nxtp)
1274: struct mbuf *m;
1275: int off;
1276: int proto;
1277: int *nxtp;
1278: {
1279: struct ip6_hdr ip6;
1280: struct ip6_ext ip6e;
1281: struct ip6_frag fh;
1282:
1283: /* just in case */
1284: if (m == NULL)
1285: panic("ip6_nexthdr: m == NULL");
1286: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1287: return -1;
1288:
1289: switch (proto) {
1290: case IPPROTO_IPV6:
1291: if (m->m_pkthdr.len < off + sizeof(ip6))
1292: return -1;
1293: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1294: if (nxtp)
1295: *nxtp = ip6.ip6_nxt;
1296: off += sizeof(ip6);
1297: return off;
1298:
1299: case IPPROTO_FRAGMENT:
1300: /*
1301: * terminate parsing if it is not the first fragment,
1302: * it does not make sense to parse through it.
1303: */
1304: if (m->m_pkthdr.len < off + sizeof(fh))
1305: return -1;
1306: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1307: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1308: return -1;
1309: if (nxtp)
1310: *nxtp = fh.ip6f_nxt;
1311: off += sizeof(struct ip6_frag);
1312: return off;
1313:
1314: case IPPROTO_AH:
1315: if (m->m_pkthdr.len < off + sizeof(ip6e))
1316: return -1;
1317: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1318: if (nxtp)
1319: *nxtp = ip6e.ip6e_nxt;
1320: off += (ip6e.ip6e_len + 2) << 2;
1321: return off;
1322:
1323: case IPPROTO_HOPOPTS:
1324: case IPPROTO_ROUTING:
1325: case IPPROTO_DSTOPTS:
1326: if (m->m_pkthdr.len < off + sizeof(ip6e))
1327: return -1;
1328: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1329: if (nxtp)
1330: *nxtp = ip6e.ip6e_nxt;
1331: off += (ip6e.ip6e_len + 1) << 3;
1332: return off;
1333:
1334: case IPPROTO_NONE:
1335: case IPPROTO_ESP:
1336: case IPPROTO_IPCOMP:
1337: /* give up */
1338: return -1;
1339:
1340: default:
1341: return -1;
1342: }
1343:
1344: return -1;
1345: }
1346:
1347: /*
1348: * get offset for the last header in the chain. m will be kept untainted.
1349: */
1350: int
1351: ip6_lasthdr(m, off, proto, nxtp)
1352: struct mbuf *m;
1353: int off;
1354: int proto;
1355: int *nxtp;
1356: {
1357: int newoff;
1358: int nxt;
1359:
1360: if (!nxtp) {
1361: nxt = -1;
1362: nxtp = &nxt;
1363: }
1364: while (1) {
1365: newoff = ip6_nexthdr(m, off, proto, nxtp);
1366: if (newoff < 0)
1367: return off;
1368: else if (newoff < off)
1369: return -1; /* invalid */
1370: else if (newoff == off)
1371: return newoff;
1372:
1373: off = newoff;
1374: proto = *nxtp;
1375: }
1376: }
1377:
1378: /*
1.2 itojun 1379: * System control for IP6
1380: */
1381:
1382: u_char inet6ctlerrmap[PRC_NCMDS] = {
1383: 0, 0, 0, 0,
1384: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1385: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1386: EMSGSIZE, EHOSTUNREACH, 0, 0,
1387: 0, 0, 0, 0,
1388: ENOPROTOOPT
1389: };
1390:
1.8.2.1 bouyer 1391: #include <uvm/uvm_extern.h>
1.2 itojun 1392: #include <sys/sysctl.h>
1393:
1394: int
1395: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1396: int *name;
1397: u_int namelen;
1398: void *oldp;
1399: size_t *oldlenp;
1400: void *newp;
1401: size_t newlen;
1402: {
1.8.2.1 bouyer 1403: int old, error;
1404:
1.2 itojun 1405: /* All sysctl names at this level are terminal. */
1406: if (namelen != 1)
1407: return ENOTDIR;
1408:
1409: switch (name[0]) {
1410:
1411: case IPV6CTL_FORWARDING:
1412: return sysctl_int(oldp, oldlenp, newp, newlen,
1413: &ip6_forwarding);
1414: case IPV6CTL_SENDREDIRECTS:
1415: return sysctl_int(oldp, oldlenp, newp, newlen,
1416: &ip6_sendredirects);
1417: case IPV6CTL_DEFHLIM:
1418: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1419: case IPV6CTL_MAXFRAGPACKETS:
1420: return sysctl_int(oldp, oldlenp, newp, newlen,
1421: &ip6_maxfragpackets);
1422: case IPV6CTL_ACCEPT_RTADV:
1423: return sysctl_int(oldp, oldlenp, newp, newlen,
1424: &ip6_accept_rtadv);
1425: case IPV6CTL_KEEPFAITH:
1426: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1427: case IPV6CTL_LOG_INTERVAL:
1428: return sysctl_int(oldp, oldlenp, newp, newlen,
1429: &ip6_log_interval);
1430: case IPV6CTL_HDRNESTLIMIT:
1431: return sysctl_int(oldp, oldlenp, newp, newlen,
1432: &ip6_hdrnestlimit);
1433: case IPV6CTL_DAD_COUNT:
1434: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1435: case IPV6CTL_AUTO_FLOWLABEL:
1436: return sysctl_int(oldp, oldlenp, newp, newlen,
1437: &ip6_auto_flowlabel);
1438: case IPV6CTL_DEFMCASTHLIM:
1439: return sysctl_int(oldp, oldlenp, newp, newlen,
1440: &ip6_defmcasthlim);
1441: case IPV6CTL_GIF_HLIM:
1442: return sysctl_int(oldp, oldlenp, newp, newlen,
1443: &ip6_gif_hlim);
1444: case IPV6CTL_KAME_VERSION:
1445: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.8.2.1 bouyer 1446: case IPV6CTL_USE_DEPRECATED:
1447: return sysctl_int(oldp, oldlenp, newp, newlen,
1448: &ip6_use_deprecated);
1449: case IPV6CTL_RR_PRUNE:
1450: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1451: #ifndef INET6_BINDV6ONLY
1452: case IPV6CTL_BINDV6ONLY:
1453: return sysctl_int(oldp, oldlenp, newp, newlen,
1454: &ip6_bindv6only);
1455: #endif
1456: case IPV6CTL_ANONPORTMIN:
1457: old = ip6_anonportmin;
1458: error = sysctl_int(oldp, oldlenp, newp, newlen,
1459: &ip6_anonportmin);
1460: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1461: ip6_anonportmin > 65535
1462: #ifndef IPNOPRIVPORTS
1463: || ip6_anonportmin < IPV6PORT_RESERVED
1464: #endif
1465: ) {
1466: ip6_anonportmin = old;
1467: return (EINVAL);
1468: }
1469: return (error);
1470: case IPV6CTL_ANONPORTMAX:
1471: old = ip6_anonportmax;
1472: error = sysctl_int(oldp, oldlenp, newp, newlen,
1473: &ip6_anonportmax);
1474: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1475: ip6_anonportmax > 65535
1476: #ifndef IPNOPRIVPORTS
1477: || ip6_anonportmax < IPV6PORT_RESERVED
1478: #endif
1479: ) {
1480: ip6_anonportmax = old;
1481: return (EINVAL);
1482: }
1483: return (error);
1484: #ifndef IPNOPRIVPORTS
1485: case IPV6CTL_LOWPORTMIN:
1486: old = ip6_lowportmin;
1487: error = sysctl_int(oldp, oldlenp, newp, newlen,
1488: &ip6_lowportmin);
1489: if (ip6_lowportmin >= ip6_lowportmax ||
1490: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1491: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1492: ip6_lowportmin = old;
1493: return (EINVAL);
1494: }
1495: return (error);
1496: case IPV6CTL_LOWPORTMAX:
1497: old = ip6_lowportmax;
1498: error = sysctl_int(oldp, oldlenp, newp, newlen,
1499: &ip6_lowportmax);
1500: if (ip6_lowportmin >= ip6_lowportmax ||
1501: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1502: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1503: ip6_lowportmax = old;
1504: return (EINVAL);
1505: }
1506: return (error);
1507: #endif
1.2 itojun 1508: default:
1509: return EOPNOTSUPP;
1510: }
1511: /* NOTREACHED */
1512: }
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