Annotation of src/sys/netinet6/ip6_input.c, Revision 1.8.2.7
1.8.2.7 ! bouyer 1: /* $NetBSD: ip6_input.c,v 1.41 2001/04/13 23:30:26 thorpej Exp $ */
! 2: /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.8.2.1 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 (;;) {
1.8.2.7 ! bouyer 219: s = splnet();
1.2 itojun 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 {
1.8.2.7 ! bouyer 261: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2 itojun 262: if (m->m_next) {
1.8.2.1 bouyer 263: if (m->m_flags & M_LOOP) {
1.2 itojun 264: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.8.2.7 ! bouyer 265: } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2 itojun 266: ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
267: else
268: ip6stat.ip6s_m2m[0]++;
269: } else
270: ip6stat.ip6s_m1++;
1.8.2.7 ! bouyer 271: #undef M2MMAX
1.2 itojun 272: }
273:
1.8.2.1 bouyer 274: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.2 itojun 275: ip6stat.ip6s_total++;
276:
1.8.2.1 bouyer 277: #ifndef PULLDOWN_TEST
278: /* XXX is the line really necessary? */
279: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
280: #endif
281:
282: if (m->m_len < sizeof(struct ip6_hdr)) {
283: struct ifnet *inifp;
284: inifp = m->m_pkthdr.rcvif;
285: if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
286: ip6stat.ip6s_toosmall++;
287: in6_ifstat_inc(inifp, ifs6_in_hdrerr);
288: return;
289: }
1.2 itojun 290: }
291:
292: ip6 = mtod(m, struct ip6_hdr *);
293:
294: if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
295: ip6stat.ip6s_badvers++;
1.8.2.1 bouyer 296: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 297: goto bad;
298: }
299:
1.8.2.1 bouyer 300: #ifdef PFIL_HOOKS
301: /*
302: * Run through list of hooks for input packets. If there are any
303: * filters which require that additional packets in the flow are
304: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
305: * Note that filters must _never_ set this flag, as another filter
306: * in the list may have previously cleared it.
307: */
1.8.2.6 bouyer 308: /*
309: * let ipfilter look at packet on the wire,
310: * not the decapsulated packet.
311: */
312: #ifdef IPSEC
313: if (!ipsec_gethist(m, NULL))
314: #else
315: if (1)
316: #endif
317: {
318: if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
319: PFIL_IN) != 0)
320: return;
321: if (m == NULL)
322: return;
323: ip6 = mtod(m, struct ip6_hdr *);
324: }
1.8.2.1 bouyer 325: #endif /* PFIL_HOOKS */
326:
327:
1.2 itojun 328: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
329:
1.8.2.3 bouyer 330: #ifdef ALTQ
331: /* XXX Temporary until ALTQ is changed to use a pfil hook */
332: if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
333: /* packet is dropped by traffic conditioner */
334: return;
1.8.2.1 bouyer 335: }
336: #endif
337:
1.2 itojun 338: /*
339: * Scope check
340: */
341: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
342: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
343: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 344: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 345: goto bad;
346: }
1.8.2.1 bouyer 347: /*
348: * The following check is not documented in the spec. Malicious party
349: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
350: * bypass security checks (act as if it was from 127.0.0.1 by using
351: * IPv6 src ::ffff:127.0.0.1). Be cautious.
1.8.2.4 bouyer 352: *
353: * This check chokes if we are in SIIT cloud. As none of BSDs support
354: * IPv4-less kernel compilation, we cannot support SIIT environment
355: * at all. So, it makes more sense for us to reject any malicious
356: * packets for non-SIIT environment, than try to do a partical support
357: * for SIIT environment.
1.8.2.1 bouyer 358: */
359: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
360: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
361: ip6stat.ip6s_badscope++;
362: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
363: goto bad;
364: }
365: #if 0
366: /*
367: * Reject packets with IPv4 compatible addresses (auto tunnel).
368: *
369: * The code forbids auto tunnel relay case in RFC1933 (the check is
370: * stronger than RFC1933). We may want to re-enable it if mech-xx
371: * is revised to forbid relaying case.
372: */
373: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
374: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
375: ip6stat.ip6s_badscope++;
376: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
377: goto bad;
378: }
379: #endif
1.8.2.4 bouyer 380:
1.2 itojun 381: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
382: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
383: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
384: ours = 1;
1.8.2.1 bouyer 385: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 386: goto hbhcheck;
387: } else {
388: ip6stat.ip6s_badscope++;
1.8.2.1 bouyer 389: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 390: goto bad;
391: }
392: }
393:
1.8.2.6 bouyer 394: /* drop packets if interface ID portion is already filled */
395: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
396: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
397: ip6->ip6_src.s6_addr16[1]) {
398: ip6stat.ip6s_badscope++;
399: goto bad;
400: }
401: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
402: ip6->ip6_dst.s6_addr16[1]) {
403: ip6stat.ip6s_badscope++;
404: goto bad;
405: }
406: }
1.2 itojun 407:
1.8.2.7 ! bouyer 408: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
! 409: ip6->ip6_src.s6_addr16[1]
! 410: = htons(m->m_pkthdr.rcvif->if_index);
! 411: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
! 412: ip6->ip6_dst.s6_addr16[1]
! 413: = htons(m->m_pkthdr.rcvif->if_index);
! 414:
! 415: /*
! 416: * We use rt->rt_ifp to determine if the address is ours or not.
! 417: * If rt_ifp is lo0, the address is ours.
! 418: * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
! 419: * so any address under fe80::%lo0/64 will be mistakenly considered
! 420: * local. The special case is supplied to handle the case properly
! 421: * by actually looking at interface addresses
! 422: * (using in6ifa_ifpwithaddr).
! 423: */
! 424: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
! 425: IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
! 426: if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
! 427: icmp6_error(m, ICMP6_DST_UNREACH,
! 428: ICMP6_DST_UNREACH_ADDR, 0);
! 429: /* m is already freed */
! 430: return;
1.8.2.1 bouyer 431: }
1.8.2.7 ! bouyer 432:
! 433: ours = 1;
! 434: deliverifp = m->m_pkthdr.rcvif;
! 435: goto hbhcheck;
1.8.2.1 bouyer 436: }
437:
438: /*
1.2 itojun 439: * Multicast check
440: */
441: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
442: struct in6_multi *in6m = 0;
1.8.2.1 bouyer 443:
444: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 445: /*
446: * See if we belong to the destination multicast group on the
447: * arrival interface.
448: */
449: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
450: if (in6m)
451: ours = 1;
452: else if (!ip6_mrouter) {
453: ip6stat.ip6s_notmember++;
454: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 455: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 456: goto bad;
457: }
1.8.2.1 bouyer 458: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 459: goto hbhcheck;
460: }
461:
462: /*
463: * Unicast check
464: */
1.8.2.1 bouyer 465: if (ip6_forward_rt.ro_rt != NULL &&
466: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
467: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.8.2.4 bouyer 468: &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.8.2.1 bouyer 469: ip6stat.ip6s_forward_cachehit++;
470: else {
1.8.2.4 bouyer 471: struct sockaddr_in6 *dst6;
472:
1.2 itojun 473: if (ip6_forward_rt.ro_rt) {
1.8.2.1 bouyer 474: /* route is down or destination is different */
475: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 476: RTFREE(ip6_forward_rt.ro_rt);
477: ip6_forward_rt.ro_rt = 0;
478: }
1.8.2.1 bouyer 479:
1.2 itojun 480: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.8.2.4 bouyer 481: dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
482: dst6->sin6_len = sizeof(struct sockaddr_in6);
483: dst6->sin6_family = AF_INET6;
484: dst6->sin6_addr = ip6->ip6_dst;
1.2 itojun 485:
486: rtalloc((struct route *)&ip6_forward_rt);
487: }
488:
489: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
490:
491: /*
492: * Accept the packet if the forwarding interface to the destination
493: * according to the routing table is the loopback interface,
494: * unless the associated route has a gateway.
495: * Note that this approach causes to accept a packet if there is a
496: * route to the loopback interface for the destination of the packet.
497: * But we think it's even useful in some situations, e.g. when using
498: * a special daemon which wants to intercept the packet.
499: */
500: if (ip6_forward_rt.ro_rt &&
501: (ip6_forward_rt.ro_rt->rt_flags &
502: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
503: #if 0
504: /*
505: * The check below is redundant since the comparison of
506: * the destination and the key of the rtentry has
507: * already done through looking up the routing table.
508: */
509: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
510: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
511: #endif
1.8.2.1 bouyer 512: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 513: struct in6_ifaddr *ia6 =
514: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
515: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
516: m->m_flags |= M_ANYCAST6;
1.8.2.1 bouyer 517: /*
518: * packets to a tentative, duplicated, or somehow invalid
519: * address must not be accepted.
520: */
1.2 itojun 521: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.8.2.1 bouyer 522: /* this address is ready */
1.2 itojun 523: ours = 1;
1.8.2.1 bouyer 524: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 525: goto hbhcheck;
526: } else {
1.8.2.1 bouyer 527: /* address is not ready, so discard the packet. */
1.8.2.4 bouyer 528: nd6log((LOG_INFO,
1.8.2.1 bouyer 529: "ip6_input: packet to an unready address %s->%s\n",
530: ip6_sprintf(&ip6->ip6_src),
1.8.2.4 bouyer 531: ip6_sprintf(&ip6->ip6_dst)));
1.8.2.1 bouyer 532:
533: goto bad;
1.2 itojun 534: }
535: }
536:
537: /*
538: * FAITH(Firewall Aided Internet Translator)
539: */
540: #if defined(NFAITH) && 0 < NFAITH
541: if (ip6_keepfaith) {
542: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
543: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
544: /* XXX do we need more sanity checks? */
545: ours = 1;
1.8.2.1 bouyer 546: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
547: goto hbhcheck;
548: }
549: }
550: #endif
551:
552: #if 0
553: {
554: /*
555: * Last resort: check in6_ifaddr for incoming interface.
556: * The code is here until I update the "goto ours hack" code above
557: * working right.
558: */
559: struct ifaddr *ifa;
560: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
561: ifa;
562: ifa = ifa->ifa_list.tqe_next) {
563: if (ifa->ifa_addr == NULL)
564: continue; /* just for safety */
565: if (ifa->ifa_addr->sa_family != AF_INET6)
566: continue;
567: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
568: ours = 1;
569: deliverifp = ifa->ifa_ifp;
1.2 itojun 570: goto hbhcheck;
571: }
572: }
1.8.2.1 bouyer 573: }
1.2 itojun 574: #endif
575:
576: /*
577: * Now there is no reason to process the packet if it's not our own
578: * and we're not a router.
579: */
580: if (!ip6_forwarding) {
581: ip6stat.ip6s_cantforward++;
1.8.2.1 bouyer 582: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 583: goto bad;
584: }
585:
586: hbhcheck:
587: /*
588: * Process Hop-by-Hop options header if it's contained.
589: * m may be modified in ip6_hopopts_input().
590: * If a JumboPayload option is included, plen will also be modified.
591: */
592: plen = (u_int32_t)ntohs(ip6->ip6_plen);
593: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 594: struct ip6_hbh *hbh;
595:
596: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
597: #if 0 /*touches NULL pointer*/
598: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
599: #endif
1.2 itojun 600: return; /* m have already been freed */
1.8.2.1 bouyer 601: }
602:
1.2 itojun 603: /* adjust pointer */
604: ip6 = mtod(m, struct ip6_hdr *);
1.8.2.1 bouyer 605:
606: /*
607: * if the payload length field is 0 and the next header field
608: * indicates Hop-by-Hop Options header, then a Jumbo Payload
609: * option MUST be included.
610: */
611: if (ip6->ip6_plen == 0 && plen == 0) {
612: /*
613: * Note that if a valid jumbo payload option is
614: * contained, ip6_hoptops_input() must set a valid
615: * (non-zero) payload length to the variable plen.
616: */
617: ip6stat.ip6s_badoptions++;
618: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
619: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
620: icmp6_error(m, ICMP6_PARAM_PROB,
621: ICMP6_PARAMPROB_HEADER,
622: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
623: return;
624: }
625: #ifndef PULLDOWN_TEST
626: /* ip6_hopopts_input() ensures that mbuf is contiguous */
627: hbh = (struct ip6_hbh *)(ip6 + 1);
628: #else
629: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
630: sizeof(struct ip6_hbh));
631: if (hbh == NULL) {
632: ip6stat.ip6s_tooshort++;
633: return;
634: }
635: #endif
636: nxt = hbh->ip6h_nxt;
1.2 itojun 637:
638: /*
639: * accept the packet if a router alert option is included
640: * and we act as an IPv6 router.
641: */
1.5 itojun 642: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 643: ours = 1;
644: } else
645: nxt = ip6->ip6_nxt;
646:
647: /*
648: * Check that the amount of data in the buffers
649: * is as at least much as the IPv6 header would have us expect.
650: * Trim mbufs if longer than we expect.
651: * Drop packet if shorter than we expect.
652: */
653: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
654: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 655: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 656: goto bad;
657: }
658: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
659: if (m->m_len == m->m_pkthdr.len) {
660: m->m_len = sizeof(struct ip6_hdr) + plen;
661: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
662: } else
663: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
664: }
665:
666: /*
667: * Forward if desirable.
668: */
669: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
670: /*
671: * If we are acting as a multicast router, all
672: * incoming multicast packets are passed to the
673: * kernel-level multicast forwarding function.
674: * The packet is returned (relatively) intact; if
675: * ip6_mforward() returns a non-zero value, the packet
676: * must be discarded, else it may be accepted below.
677: */
678: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
679: ip6stat.ip6s_cantforward++;
680: m_freem(m);
681: return;
682: }
683: if (!ours) {
684: m_freem(m);
685: return;
686: }
1.8.2.1 bouyer 687: } else if (!ours) {
1.2 itojun 688: ip6_forward(m, 0);
689: return;
690: }
691:
1.8.2.1 bouyer 692: ip6 = mtod(m, struct ip6_hdr *);
693:
694: /*
695: * Malicious party may be able to use IPv4 mapped addr to confuse
696: * tcp/udp stack and bypass security checks (act as if it was from
697: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
698: *
699: * For SIIT end node behavior, you may want to disable the check.
700: * However, you will become vulnerable to attacks using IPv4 mapped
701: * source.
702: */
703: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
704: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
705: ip6stat.ip6s_badscope++;
706: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
707: goto bad;
708: }
709:
1.2 itojun 710: /*
711: * Tell launch routine the next header
712: */
1.8.2.1 bouyer 713: #ifdef IFA_STATS
714: if (deliverifp != NULL) {
715: struct in6_ifaddr *ia6;
716: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
717: if (ia6)
718: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
719: }
720: #endif
1.2 itojun 721: ip6stat.ip6s_delivered++;
1.8.2.1 bouyer 722: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 723: nest = 0;
1.8.2.7 ! bouyer 724:
1.2 itojun 725: while (nxt != IPPROTO_DONE) {
726: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
727: ip6stat.ip6s_toomanyhdr++;
728: goto bad;
729: }
1.8 itojun 730:
731: /*
732: * protection against faulty packet - there should be
733: * more sanity checks in header chain processing.
734: */
735: if (m->m_pkthdr.len < off) {
736: ip6stat.ip6s_tooshort++;
1.8.2.1 bouyer 737: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 738: goto bad;
739: }
740:
1.8.2.5 bouyer 741: #ifdef IPSEC
742: /*
743: * enforce IPsec policy checking if we are seeing last header.
744: * note that we do not visit this with protocols with pcb layer
745: * code - like udp/tcp/raw ip.
746: */
747: if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
748: ipsec6_in_reject(m, NULL)) {
749: ipsec6stat.in_polvio++;
750: goto bad;
751: }
752: #endif
753:
1.2 itojun 754: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
755: }
756: return;
757: bad:
758: m_freem(m);
759: }
760:
761: /*
762: * Hop-by-Hop options header processing. If a valid jumbo payload option is
763: * included, the real payload length will be stored in plenp.
764: */
765: static int
766: ip6_hopopts_input(plenp, rtalertp, mp, offp)
767: u_int32_t *plenp;
1.5 itojun 768: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 769: struct mbuf **mp;
770: int *offp;
771: {
1.8.2.4 bouyer 772: struct mbuf *m = *mp;
1.2 itojun 773: int off = *offp, hbhlen;
774: struct ip6_hbh *hbh;
775: u_int8_t *opt;
776:
777: /* validation of the length of the header */
1.8.2.1 bouyer 778: #ifndef PULLDOWN_TEST
1.2 itojun 779: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
780: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
781: hbhlen = (hbh->ip6h_len + 1) << 3;
782:
783: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
784: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.8.2.1 bouyer 785: #else
786: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
787: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
788: if (hbh == NULL) {
789: ip6stat.ip6s_tooshort++;
790: return -1;
791: }
792: hbhlen = (hbh->ip6h_len + 1) << 3;
793: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
794: hbhlen);
795: if (hbh == NULL) {
796: ip6stat.ip6s_tooshort++;
797: return -1;
798: }
799: #endif
1.2 itojun 800: off += hbhlen;
801: hbhlen -= sizeof(struct ip6_hbh);
802: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
803:
804: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
805: hbhlen, rtalertp, plenp) < 0)
806: return(-1);
807:
808: *offp = off;
809: *mp = m;
810: return(0);
811: }
812:
813: /*
814: * Search header for all Hop-by-hop options and process each option.
815: * This function is separate from ip6_hopopts_input() in order to
816: * handle a case where the sending node itself process its hop-by-hop
817: * options header. In such a case, the function is called from ip6_output().
818: */
819: int
820: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
821: struct mbuf *m;
822: u_int8_t *opthead;
823: int hbhlen;
1.5 itojun 824: u_int32_t *rtalertp;
1.2 itojun 825: u_int32_t *plenp;
826: {
827: struct ip6_hdr *ip6;
828: int optlen = 0;
829: u_int8_t *opt = opthead;
830: u_int16_t rtalert_val;
1.8.2.1 bouyer 831: u_int32_t jumboplen;
1.2 itojun 832:
833: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.8.2.4 bouyer 834: switch (*opt) {
835: case IP6OPT_PAD1:
836: optlen = 1;
837: break;
838: case IP6OPT_PADN:
839: if (hbhlen < IP6OPT_MINLEN) {
840: ip6stat.ip6s_toosmall++;
841: goto bad;
842: }
843: optlen = *(opt + 1) + 2;
844: break;
845: case IP6OPT_RTALERT:
1.8.2.1 bouyer 846: /* XXX may need check for alignment */
1.8.2.4 bouyer 847: if (hbhlen < IP6OPT_RTALERT_LEN) {
1.8.2.1 bouyer 848: ip6stat.ip6s_toosmall++;
849: goto bad;
850: }
1.8.2.4 bouyer 851: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.8.2.1 bouyer 852: /* XXX: should we discard the packet? */
1.8.2.4 bouyer 853: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
854: *(opt + 1));
855: }
856: optlen = IP6OPT_RTALERT_LEN;
857: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
858: *rtalertp = ntohs(rtalert_val);
859: break;
860: case IP6OPT_JUMBO:
861: /* XXX may need check for alignment */
862: if (hbhlen < IP6OPT_JUMBO_LEN) {
863: ip6stat.ip6s_toosmall++;
864: goto bad;
865: }
866: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
867: /* XXX: should we discard the packet? */
1.8.2.1 bouyer 868: log(LOG_ERR, "length of jumbopayload opt "
869: "is inconsistent(%d)\n",
870: *(opt + 1));
1.8.2.4 bouyer 871: }
1.8.2.1 bouyer 872: optlen = IP6OPT_JUMBO_LEN;
1.2 itojun 873:
1.8.2.1 bouyer 874: /*
875: * IPv6 packets that have non 0 payload length
1.8.2.4 bouyer 876: * must not contain a jumbo payload option.
1.8.2.1 bouyer 877: */
878: ip6 = mtod(m, struct ip6_hdr *);
879: if (ip6->ip6_plen) {
880: ip6stat.ip6s_badoptions++;
881: icmp6_error(m, ICMP6_PARAM_PROB,
882: ICMP6_PARAMPROB_HEADER,
883: sizeof(struct ip6_hdr) +
884: sizeof(struct ip6_hbh) +
885: opt - opthead);
886: return(-1);
887: }
888:
889: /*
890: * We may see jumbolen in unaligned location, so
891: * we'd need to perform bcopy().
892: */
893: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
894: jumboplen = (u_int32_t)htonl(jumboplen);
895:
896: #if 1
897: /*
898: * if there are multiple jumbo payload options,
899: * *plenp will be non-zero and the packet will be
900: * rejected.
901: * the behavior may need some debate in ipngwg -
902: * multiple options does not make sense, however,
903: * there's no explicit mention in specification.
904: */
905: if (*plenp != 0) {
906: ip6stat.ip6s_badoptions++;
907: icmp6_error(m, ICMP6_PARAM_PROB,
908: ICMP6_PARAMPROB_HEADER,
909: sizeof(struct ip6_hdr) +
910: sizeof(struct ip6_hbh) +
911: opt + 2 - opthead);
912: return(-1);
913: }
1.8 itojun 914: #endif
1.2 itojun 915:
1.8.2.1 bouyer 916: /*
917: * jumbo payload length must be larger than 65535.
918: */
919: if (jumboplen <= IPV6_MAXPACKET) {
920: ip6stat.ip6s_badoptions++;
921: icmp6_error(m, ICMP6_PARAM_PROB,
922: ICMP6_PARAMPROB_HEADER,
923: sizeof(struct ip6_hdr) +
924: sizeof(struct ip6_hbh) +
925: opt + 2 - opthead);
926: return(-1);
927: }
928: *plenp = jumboplen;
929:
930: break;
1.8.2.4 bouyer 931: default: /* unknown option */
932: if (hbhlen < IP6OPT_MINLEN) {
933: ip6stat.ip6s_toosmall++;
934: goto bad;
935: }
936: if ((optlen = ip6_unknown_opt(opt, m,
937: sizeof(struct ip6_hdr) +
938: sizeof(struct ip6_hbh) +
939: opt - opthead)) == -1)
940: return(-1);
941: optlen += 2;
942: break;
1.2 itojun 943: }
944: }
945:
946: return(0);
947:
948: bad:
949: m_freem(m);
950: return(-1);
951: }
952:
953: /*
954: * Unknown option processing.
955: * The third argument `off' is the offset from the IPv6 header to the option,
956: * which is necessary if the IPv6 header the and option header and IPv6 header
957: * is not continuous in order to return an ICMPv6 error.
958: */
959: int
960: ip6_unknown_opt(optp, m, off)
961: u_int8_t *optp;
962: struct mbuf *m;
963: int off;
964: {
965: struct ip6_hdr *ip6;
966:
1.8.2.4 bouyer 967: switch (IP6OPT_TYPE(*optp)) {
968: case IP6OPT_TYPE_SKIP: /* ignore the option */
969: return((int)*(optp + 1));
970: case IP6OPT_TYPE_DISCARD: /* silently discard */
971: m_freem(m);
972: return(-1);
973: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
974: ip6stat.ip6s_badoptions++;
975: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
976: return(-1);
977: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
978: ip6stat.ip6s_badoptions++;
979: ip6 = mtod(m, struct ip6_hdr *);
980: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
981: (m->m_flags & (M_BCAST|M_MCAST)))
982: m_freem(m);
983: else
984: icmp6_error(m, ICMP6_PARAM_PROB,
985: ICMP6_PARAMPROB_OPTION, off);
986: return(-1);
1.2 itojun 987: }
988:
989: m_freem(m); /* XXX: NOTREACHED */
990: return(-1);
991: }
992:
993: /*
1.8.2.1 bouyer 994: * Create the "control" list for this pcb.
995: *
996: * The routine will be called from upper layer handlers like tcp6_input().
997: * Thus the routine assumes that the caller (tcp6_input) have already
998: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
999: * very first mbuf on the mbuf chain.
1000: * We may want to add some infinite loop prevention or sanity checks for safety.
1001: * (This applies only when you are using KAME mbuf chain restriction, i.e.
1002: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 1003: */
1004: void
1005: ip6_savecontrol(in6p, mp, ip6, m)
1.8.2.4 bouyer 1006: struct in6pcb *in6p;
1007: struct mbuf **mp;
1008: struct ip6_hdr *ip6;
1009: struct mbuf *m;
1.2 itojun 1010: {
1011: struct proc *p = curproc; /* XXX */
1.8.2.1 bouyer 1012: int privileged;
1013:
1014: privileged = 0;
1015: if (p && !suser(p->p_ucred, &p->p_acflag))
1016: privileged++;
1.2 itojun 1017:
1.8.2.1 bouyer 1018: #ifdef SO_TIMESTAMP
1.2 itojun 1019: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1020: struct timeval tv;
1021:
1022: microtime(&tv);
1023: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1024: SCM_TIMESTAMP, SOL_SOCKET);
1025: if (*mp)
1026: mp = &(*mp)->m_next;
1027: }
1.8.2.1 bouyer 1028: #endif
1.2 itojun 1029: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
1030: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1031: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
1032: IPPROTO_IPV6);
1033: if (*mp)
1034: mp = &(*mp)->m_next;
1035: }
1036:
1037: #ifdef noyet
1038: /* options were tossed above */
1039: if (in6p->in6p_flags & IN6P_RECVOPTS)
1040: /* broken */
1041: /* ip6_srcroute doesn't do what we want here, need to fix */
1042: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1043: /* broken */
1044: #endif
1045:
1046: /* RFC 2292 sec. 5 */
1.8.2.4 bouyer 1047: if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2 itojun 1048: struct in6_pktinfo pi6;
1049: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1050: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1051: pi6.ipi6_addr.s6_addr16[1] = 0;
1052: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1053: ? m->m_pkthdr.rcvif->if_index
1054: : 0;
1055: *mp = sbcreatecontrol((caddr_t) &pi6,
1056: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1057: IPPROTO_IPV6);
1058: if (*mp)
1059: mp = &(*mp)->m_next;
1060: }
1061: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1062: int hlim = ip6->ip6_hlim & 0xff;
1063: *mp = sbcreatecontrol((caddr_t) &hlim,
1064: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1065: if (*mp)
1066: mp = &(*mp)->m_next;
1067: }
1068: /* IN6P_NEXTHOP - for outgoing packet only */
1069:
1070: /*
1071: * IPV6_HOPOPTS socket option. We require super-user privilege
1072: * for the option, but it might be too strict, since there might
1073: * be some hop-by-hop options which can be returned to normal user.
1074: * See RFC 2292 section 6.
1075: */
1.8.2.4 bouyer 1076: if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2 itojun 1077: /*
1078: * Check if a hop-by-hop options header is contatined in the
1079: * received packet, and if so, store the options as ancillary
1080: * data. Note that a hop-by-hop options header must be
1081: * just after the IPv6 header, which fact is assured through
1082: * the IPv6 input processing.
1083: */
1084: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1085: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.8.2.1 bouyer 1086: struct ip6_hbh *hbh;
1087: int hbhlen;
1088:
1089: #ifndef PULLDOWN_TEST
1090: hbh = (struct ip6_hbh *)(ip6 + 1);
1091: hbhlen = (hbh->ip6h_len + 1) << 3;
1092: #else
1093: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1094: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1095: if (hbh == NULL) {
1096: ip6stat.ip6s_tooshort++;
1097: return;
1098: }
1099: hbhlen = (hbh->ip6h_len + 1) << 3;
1100: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1101: sizeof(struct ip6_hdr), hbhlen);
1102: if (hbh == NULL) {
1103: ip6stat.ip6s_tooshort++;
1104: return;
1105: }
1106: #endif
1.2 itojun 1107:
1108: /*
1109: * XXX: We copy whole the header even if a jumbo
1110: * payload option is included, which option is to
1111: * be removed before returning in the RFC 2292.
1112: * But it's too painful operation...
1113: */
1.8.2.1 bouyer 1114: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1115: IPV6_HOPOPTS, IPPROTO_IPV6);
1116: if (*mp)
1117: mp = &(*mp)->m_next;
1118: }
1119: }
1120:
1121: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1122: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1123: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1124: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1125:
1126: /*
1127: * Search for destination options headers or routing
1128: * header(s) through the header chain, and stores each
1129: * header as ancillary data.
1130: * Note that the order of the headers remains in
1131: * the chain of ancillary data.
1132: */
1.8.2.4 bouyer 1133: while (1) { /* is explicit loop prevention necessary? */
1.8.2.1 bouyer 1134: struct ip6_ext *ip6e;
1135: int elen;
1136:
1137: #ifndef PULLDOWN_TEST
1138: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1139: if (nxt == IPPROTO_AH)
1140: elen = (ip6e->ip6e_len + 2) << 2;
1141: else
1142: elen = (ip6e->ip6e_len + 1) << 3;
1143: #else
1144: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1145: sizeof(struct ip6_ext));
1146: if (ip6e == NULL) {
1147: ip6stat.ip6s_tooshort++;
1148: return;
1149: }
1150: if (nxt == IPPROTO_AH)
1151: elen = (ip6e->ip6e_len + 2) << 2;
1152: else
1153: elen = (ip6e->ip6e_len + 1) << 3;
1154: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1155: if (ip6e == NULL) {
1156: ip6stat.ip6s_tooshort++;
1157: return;
1158: }
1159: #endif
1.2 itojun 1160:
1.8.2.4 bouyer 1161: switch (nxt) {
1162: case IPPROTO_DSTOPTS:
1163: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1164: break;
1165:
1166: /*
1167: * We also require super-user privilege for
1168: * the option.
1169: * See the comments on IN6_HOPOPTS.
1170: */
1171: if (!privileged)
1172: break;
1173:
1174: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1175: IPV6_DSTOPTS,
1176: IPPROTO_IPV6);
1177: if (*mp)
1178: mp = &(*mp)->m_next;
1179: break;
1180:
1181: case IPPROTO_ROUTING:
1182: if (!in6p->in6p_flags & IN6P_RTHDR)
1183: break;
1184:
1185: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1186: IPV6_RTHDR,
1187: IPPROTO_IPV6);
1188: if (*mp)
1189: mp = &(*mp)->m_next;
1190: break;
1191:
1192: case IPPROTO_UDP:
1193: case IPPROTO_TCP:
1194: case IPPROTO_ICMPV6:
1195: default:
1196: /*
1197: * stop search if we encounter an upper
1198: * layer protocol headers.
1199: */
1200: goto loopend;
1201:
1202: case IPPROTO_HOPOPTS:
1203: case IPPROTO_AH: /* is it possible? */
1204: break;
1.2 itojun 1205: }
1206:
1207: /* proceed with the next header. */
1.8.2.1 bouyer 1208: off += elen;
1.2 itojun 1209: nxt = ip6e->ip6e_nxt;
1210: }
1211: loopend:
1.8.2.5 bouyer 1212: ;
1.2 itojun 1213: }
1.8.2.1 bouyer 1214: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1215: /* to be done */
1216: }
1.8.2.1 bouyer 1217: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1218: /* to be done */
1219: }
1220: /* IN6P_RTHDR - to be done */
1221:
1222: }
1223:
1224: /*
1225: * Get pointer to the previous header followed by the header
1226: * currently processed.
1227: * XXX: This function supposes that
1228: * M includes all headers,
1229: * the next header field and the header length field of each header
1230: * are valid, and
1231: * the sum of each header length equals to OFF.
1232: * Because of these assumptions, this function must be called very
1233: * carefully. Moreover, it will not be used in the near future when
1234: * we develop `neater' mechanism to process extension headers.
1235: */
1236: char *
1237: ip6_get_prevhdr(m, off)
1238: struct mbuf *m;
1239: int off;
1240: {
1241: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1242:
1243: if (off == sizeof(struct ip6_hdr))
1244: return(&ip6->ip6_nxt);
1245: else {
1246: int len, nxt;
1247: struct ip6_ext *ip6e = NULL;
1248:
1249: nxt = ip6->ip6_nxt;
1250: len = sizeof(struct ip6_hdr);
1251: while (len < off) {
1252: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1253:
1.8.2.4 bouyer 1254: switch (nxt) {
1.2 itojun 1255: case IPPROTO_FRAGMENT:
1256: len += sizeof(struct ip6_frag);
1257: break;
1258: case IPPROTO_AH:
1259: len += (ip6e->ip6e_len + 2) << 2;
1260: break;
1261: default:
1262: len += (ip6e->ip6e_len + 1) << 3;
1263: break;
1264: }
1265: nxt = ip6e->ip6e_nxt;
1266: }
1267: if (ip6e)
1268: return(&ip6e->ip6e_nxt);
1269: else
1270: return NULL;
1271: }
1272: }
1273:
1274: /*
1.8.2.1 bouyer 1275: * get next header offset. m will be retained.
1276: */
1277: int
1278: ip6_nexthdr(m, off, proto, nxtp)
1279: struct mbuf *m;
1280: int off;
1281: int proto;
1282: int *nxtp;
1283: {
1284: struct ip6_hdr ip6;
1285: struct ip6_ext ip6e;
1286: struct ip6_frag fh;
1287:
1288: /* just in case */
1289: if (m == NULL)
1290: panic("ip6_nexthdr: m == NULL");
1291: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1292: return -1;
1293:
1294: switch (proto) {
1295: case IPPROTO_IPV6:
1296: if (m->m_pkthdr.len < off + sizeof(ip6))
1297: return -1;
1298: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1299: if (nxtp)
1300: *nxtp = ip6.ip6_nxt;
1301: off += sizeof(ip6);
1302: return off;
1303:
1304: case IPPROTO_FRAGMENT:
1305: /*
1306: * terminate parsing if it is not the first fragment,
1307: * it does not make sense to parse through it.
1308: */
1309: if (m->m_pkthdr.len < off + sizeof(fh))
1310: return -1;
1311: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1312: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1313: return -1;
1314: if (nxtp)
1315: *nxtp = fh.ip6f_nxt;
1316: off += sizeof(struct ip6_frag);
1317: return off;
1318:
1319: case IPPROTO_AH:
1320: if (m->m_pkthdr.len < off + sizeof(ip6e))
1321: return -1;
1322: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1323: if (nxtp)
1324: *nxtp = ip6e.ip6e_nxt;
1325: off += (ip6e.ip6e_len + 2) << 2;
1326: return off;
1327:
1328: case IPPROTO_HOPOPTS:
1329: case IPPROTO_ROUTING:
1330: case IPPROTO_DSTOPTS:
1331: if (m->m_pkthdr.len < off + sizeof(ip6e))
1332: return -1;
1333: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1334: if (nxtp)
1335: *nxtp = ip6e.ip6e_nxt;
1336: off += (ip6e.ip6e_len + 1) << 3;
1337: return off;
1338:
1339: case IPPROTO_NONE:
1340: case IPPROTO_ESP:
1341: case IPPROTO_IPCOMP:
1342: /* give up */
1343: return -1;
1344:
1345: default:
1346: return -1;
1347: }
1348:
1349: return -1;
1350: }
1351:
1352: /*
1353: * get offset for the last header in the chain. m will be kept untainted.
1354: */
1355: int
1356: ip6_lasthdr(m, off, proto, nxtp)
1357: struct mbuf *m;
1358: int off;
1359: int proto;
1360: int *nxtp;
1361: {
1362: int newoff;
1363: int nxt;
1364:
1365: if (!nxtp) {
1366: nxt = -1;
1367: nxtp = &nxt;
1368: }
1369: while (1) {
1370: newoff = ip6_nexthdr(m, off, proto, nxtp);
1371: if (newoff < 0)
1372: return off;
1373: else if (newoff < off)
1374: return -1; /* invalid */
1375: else if (newoff == off)
1376: return newoff;
1377:
1378: off = newoff;
1379: proto = *nxtp;
1380: }
1381: }
1382:
1383: /*
1.2 itojun 1384: * System control for IP6
1385: */
1386:
1387: u_char inet6ctlerrmap[PRC_NCMDS] = {
1388: 0, 0, 0, 0,
1389: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1390: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1391: EMSGSIZE, EHOSTUNREACH, 0, 0,
1392: 0, 0, 0, 0,
1393: ENOPROTOOPT
1394: };
1395:
1.8.2.1 bouyer 1396: #include <uvm/uvm_extern.h>
1.2 itojun 1397: #include <sys/sysctl.h>
1398:
1399: int
1400: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1401: int *name;
1402: u_int namelen;
1403: void *oldp;
1404: size_t *oldlenp;
1405: void *newp;
1406: size_t newlen;
1407: {
1.8.2.1 bouyer 1408: int old, error;
1409:
1.2 itojun 1410: /* All sysctl names at this level are terminal. */
1411: if (namelen != 1)
1412: return ENOTDIR;
1413:
1414: switch (name[0]) {
1415:
1416: case IPV6CTL_FORWARDING:
1417: return sysctl_int(oldp, oldlenp, newp, newlen,
1418: &ip6_forwarding);
1419: case IPV6CTL_SENDREDIRECTS:
1420: return sysctl_int(oldp, oldlenp, newp, newlen,
1421: &ip6_sendredirects);
1422: case IPV6CTL_DEFHLIM:
1423: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1424: case IPV6CTL_MAXFRAGPACKETS:
1425: return sysctl_int(oldp, oldlenp, newp, newlen,
1426: &ip6_maxfragpackets);
1427: case IPV6CTL_ACCEPT_RTADV:
1428: return sysctl_int(oldp, oldlenp, newp, newlen,
1429: &ip6_accept_rtadv);
1430: case IPV6CTL_KEEPFAITH:
1431: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1432: case IPV6CTL_LOG_INTERVAL:
1433: return sysctl_int(oldp, oldlenp, newp, newlen,
1434: &ip6_log_interval);
1435: case IPV6CTL_HDRNESTLIMIT:
1436: return sysctl_int(oldp, oldlenp, newp, newlen,
1437: &ip6_hdrnestlimit);
1438: case IPV6CTL_DAD_COUNT:
1439: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1440: case IPV6CTL_AUTO_FLOWLABEL:
1441: return sysctl_int(oldp, oldlenp, newp, newlen,
1442: &ip6_auto_flowlabel);
1443: case IPV6CTL_DEFMCASTHLIM:
1444: return sysctl_int(oldp, oldlenp, newp, newlen,
1445: &ip6_defmcasthlim);
1446: case IPV6CTL_GIF_HLIM:
1447: return sysctl_int(oldp, oldlenp, newp, newlen,
1448: &ip6_gif_hlim);
1449: case IPV6CTL_KAME_VERSION:
1450: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.8.2.1 bouyer 1451: case IPV6CTL_USE_DEPRECATED:
1452: return sysctl_int(oldp, oldlenp, newp, newlen,
1453: &ip6_use_deprecated);
1454: case IPV6CTL_RR_PRUNE:
1455: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1456: #ifndef INET6_BINDV6ONLY
1457: case IPV6CTL_BINDV6ONLY:
1458: return sysctl_int(oldp, oldlenp, newp, newlen,
1459: &ip6_bindv6only);
1460: #endif
1461: case IPV6CTL_ANONPORTMIN:
1462: old = ip6_anonportmin;
1463: error = sysctl_int(oldp, oldlenp, newp, newlen,
1464: &ip6_anonportmin);
1465: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
1466: ip6_anonportmin > 65535
1467: #ifndef IPNOPRIVPORTS
1468: || ip6_anonportmin < IPV6PORT_RESERVED
1469: #endif
1470: ) {
1471: ip6_anonportmin = old;
1472: return (EINVAL);
1473: }
1474: return (error);
1475: case IPV6CTL_ANONPORTMAX:
1476: old = ip6_anonportmax;
1477: error = sysctl_int(oldp, oldlenp, newp, newlen,
1478: &ip6_anonportmax);
1479: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
1480: ip6_anonportmax > 65535
1481: #ifndef IPNOPRIVPORTS
1482: || ip6_anonportmax < IPV6PORT_RESERVED
1483: #endif
1484: ) {
1485: ip6_anonportmax = old;
1486: return (EINVAL);
1487: }
1488: return (error);
1489: #ifndef IPNOPRIVPORTS
1490: case IPV6CTL_LOWPORTMIN:
1491: old = ip6_lowportmin;
1492: error = sysctl_int(oldp, oldlenp, newp, newlen,
1493: &ip6_lowportmin);
1494: if (ip6_lowportmin >= ip6_lowportmax ||
1495: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
1496: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
1497: ip6_lowportmin = old;
1498: return (EINVAL);
1499: }
1500: return (error);
1501: case IPV6CTL_LOWPORTMAX:
1502: old = ip6_lowportmax;
1503: error = sysctl_int(oldp, oldlenp, newp, newlen,
1504: &ip6_lowportmax);
1505: if (ip6_lowportmin >= ip6_lowportmax ||
1506: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
1507: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
1508: ip6_lowportmax = old;
1509: return (EINVAL);
1510: }
1511: return (error);
1512: #endif
1.2 itojun 1513: default:
1514: return EOPNOTSUPP;
1515: }
1516: /* NOTREACHED */
1517: }
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