Annotation of src/sys/netinet6/ip6_input.c, Revision 1.23
1.23 ! mrg 1: /* $NetBSD: ip6_input.c,v 1.22 2000/06/13 14:43:44 itojun Exp $ */
1.22 itojun 2: /* $KAME: ip6_input.c,v 1.94 2000/06/13 10:06:19 jinmei Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.21 itojun 7: *
1.2 itojun 8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
1.21 itojun 19: *
1.2 itojun 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1988, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. All advertising materials mentioning features or use of this software
46: * must display the following acknowledgement:
47: * This product includes software developed by the University of
48: * California, Berkeley and its contributors.
49: * 4. Neither the name of the University nor the names of its contributors
50: * may be used to endorse or promote products derived from this software
51: * without specific prior written permission.
52: *
53: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: * SUCH DAMAGE.
64: *
65: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
66: */
67:
68: #include "opt_inet.h"
1.4 thorpej 69: #include "opt_ipsec.h"
1.15 darrenr 70: #include "opt_pfil_hooks.h"
1.2 itojun 71:
72: #include <sys/param.h>
73: #include <sys/systm.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/domain.h>
77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
80: #include <sys/errno.h>
81: #include <sys/time.h>
82: #include <sys/kernel.h>
83: #include <sys/syslog.h>
84: #include <sys/proc.h>
85:
86: #include <net/if.h>
87: #include <net/if_types.h>
88: #include <net/if_dl.h>
89: #include <net/route.h>
90: #include <net/netisr.h>
1.15 darrenr 91: #ifdef PFIL_HOOKS
92: #include <net/pfil.h>
93: #endif
1.2 itojun 94:
95: #include <netinet/in.h>
1.9 itojun 96: #include <netinet/in_systm.h>
97: #ifdef INET
98: #include <netinet/ip.h>
99: #include <netinet/ip_icmp.h>
100: #endif /*INET*/
1.14 itojun 101: #include <netinet/ip6.h>
1.2 itojun 102: #include <netinet6/in6_var.h>
1.11 itojun 103: #include <netinet6/ip6_var.h>
1.2 itojun 104: #include <netinet6/in6_pcb.h>
1.14 itojun 105: #include <netinet/icmp6.h>
1.2 itojun 106: #include <netinet6/in6_ifattach.h>
107: #include <netinet6/nd6.h>
1.9 itojun 108: #include <netinet6/in6_prefix.h>
1.2 itojun 109:
1.9 itojun 110: #ifdef IPV6FIREWALL
111: #include <netinet6/ip6_fw.h>
112: #endif
1.2 itojun 113:
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:
1.9 itojun 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 */
1.9 itojun 136:
137: #ifdef IPV6FIREWALL
138: /* firewall hooks */
139: ip6_fw_chk_t *ip6_fw_chk_ptr;
140: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2 itojun 141: #endif
142:
143: struct ip6stat ip6stat;
144:
145: static void ip6_init2 __P((void *));
146:
1.5 itojun 147: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2 itojun 148:
149: /*
150: * IP6 initialization: fill in IP6 protocol switch table.
151: * All protocols not implemented in kernel go to raw IP6 protocol handler.
152: */
153: void
154: ip6_init()
155: {
156: register struct ip6protosw *pr;
157: register int i;
158: struct timeval tv;
159:
160: pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
161: if (pr == 0)
162: panic("ip6_init");
163: for (i = 0; i < IPPROTO_MAX; i++)
164: ip6_protox[i] = pr - inet6sw;
165: for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
166: pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
167: if (pr->pr_domain->dom_family == PF_INET6 &&
168: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
169: ip6_protox[pr->pr_protocol] = pr - inet6sw;
170: ip6intrq.ifq_maxlen = ip6qmaxlen;
171: nd6_init();
172: frag6_init();
1.9 itojun 173: #ifdef IPV6FIREWALL
174: ip6_fw_init();
175: #endif
1.2 itojun 176: /*
177: * in many cases, random() here does NOT return random number
178: * as initialization during bootstrap time occur in fixed order.
179: */
180: microtime(&tv);
181: ip6_flow_seq = random() ^ tv.tv_usec;
182:
183: ip6_init2((void *)0);
184: }
185:
186: static void
187: ip6_init2(dummy)
188: void *dummy;
189: {
190: /*
191: * to route local address of p2p link to loopback,
1.21 itojun 192: * assign loopback address first.
1.2 itojun 193: */
1.20 itojun 194: in6_ifattach(&loif[0], NULL);
1.2 itojun 195:
196: /* nd6_timer_init */
1.19 thorpej 197: callout_init(&nd6_timer_ch);
198: callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9 itojun 199: /* router renumbering prefix list maintenance */
1.19 thorpej 200: callout_init(&in6_rr_timer_ch);
201: callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2 itojun 202: }
203:
204: /*
205: * IP6 input interrupt handling. Just pass the packet to ip6_input.
206: */
207: void
208: ip6intr()
209: {
210: int s;
211: struct mbuf *m;
212:
213: for (;;) {
214: s = splimp();
215: IF_DEQUEUE(&ip6intrq, m);
216: splx(s);
217: if (m == 0)
218: return;
219: ip6_input(m);
220: }
221: }
222:
223: extern struct route_in6 ip6_forward_rt;
224:
225: void
226: ip6_input(m)
227: struct mbuf *m;
228: {
1.9 itojun 229: struct ip6_hdr *ip6;
1.2 itojun 230: int off = sizeof(struct ip6_hdr), nest;
231: u_int32_t plen;
1.5 itojun 232: u_int32_t rtalert = ~0;
1.2 itojun 233: int nxt, ours = 0;
1.9 itojun 234: struct ifnet *deliverifp = NULL;
1.15 darrenr 235: #ifdef PFIL_HOOKS
236: struct packet_filter_hook *pfh;
237: struct mbuf *m0;
238: int rv;
239: #endif /* PFIL_HOOKS */
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
1.9 itojun 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) {
1.9 itojun 262: if (m->m_flags & M_LOOP) {
1.2 itojun 263: ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/
1.22 itojun 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:
1.9 itojun 272: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
273: ip6stat.ip6s_total++;
274:
275: #ifndef PULLDOWN_TEST
276: /* XXX is the line really necessary? */
1.2 itojun 277: IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9 itojun 278: #endif
1.2 itojun 279:
1.9 itojun 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++;
1.9 itojun 294: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2 itojun 295: goto bad;
296: }
1.15 darrenr 297:
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: */
306: m0 = m;
1.16 darrenr 307: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15 darrenr 308: for (; pfh; pfh = pfh->pfil_link.tqe_next)
309: if (pfh->pfil_func) {
310: rv = pfh->pfil_func(ip6, sizeof(*ip6),
311: m->m_pkthdr.rcvif, 0, &m0);
312: if (rv)
313: return;
314: m = m0;
315: if (m == NULL)
316: return;
317: ip6 = mtod(m, struct ip6_hdr *);
318: }
319: #endif /* PFIL_HOOKS */
320:
1.2 itojun 321:
322: ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
323:
1.9 itojun 324: #ifdef IPV6FIREWALL
325: /*
326: * Check with the firewall...
327: */
328: if (ip6_fw_chk_ptr) {
329: u_short port = 0;
330: /* If ipfw says divert, we have to just drop packet */
331: /* use port as a dummy argument */
332: if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
333: m_freem(m);
334: m = NULL;
335: }
336: if (!m)
337: return;
338: }
339: #endif
340:
1.2 itojun 341: /*
342: * Scope check
343: */
344: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
345: IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
346: ip6stat.ip6s_badscope++;
1.9 itojun 347: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 348: goto bad;
349: }
1.13 itojun 350: /*
351: * The following check is not documented in the spec. Malicious party
352: * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
353: * bypass security checks (act as if it was from 127.0.0.1 by using
354: * IPv6 src ::ffff:127.0.0.1). Be cautious.
355: */
356: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
357: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
358: ip6stat.ip6s_badscope++;
359: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
360: goto bad;
361: }
1.17 itojun 362: #if 0
1.13 itojun 363: /*
1.17 itojun 364: * Reject packets with IPv4 compatible addresses (auto tunnel).
365: *
366: * The code forbids auto tunnel relay case in RFC1933 (the check is
367: * stronger than RFC1933). We may want to re-enable it if mech-xx
368: * is revised to forbid relaying case.
1.13 itojun 369: */
370: if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
371: IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
372: ip6stat.ip6s_badscope++;
373: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
374: goto bad;
375: }
376: #endif
1.2 itojun 377: if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
378: IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
379: if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
380: ours = 1;
1.9 itojun 381: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 382: goto hbhcheck;
383: } else {
384: ip6stat.ip6s_badscope++;
1.9 itojun 385: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2 itojun 386: goto bad;
387: }
388: }
389:
1.21 itojun 390: #ifndef FAKE_LOOPBACK_IF
391: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
392: #else
393: if (1)
394: #endif
395: {
1.2 itojun 396: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
397: ip6->ip6_src.s6_addr16[1]
398: = htons(m->m_pkthdr.rcvif->if_index);
399: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
400: ip6->ip6_dst.s6_addr16[1]
401: = htons(m->m_pkthdr.rcvif->if_index);
402: }
403:
1.9 itojun 404: /*
1.21 itojun 405: * XXX we need this since we do not have "goto ours" hack route
406: * for some of our ifaddrs on loopback interface.
407: * we should correct it by changing in6_ifattach to install
408: * "goto ours" hack route.
1.9 itojun 409: */
1.21 itojun 410: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
411: if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
412: ours = 1;
413: deliverifp = m->m_pkthdr.rcvif;
414: goto hbhcheck;
415: }
1.9 itojun 416: }
417:
1.2 itojun 418: /*
419: * Multicast check
420: */
421: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
422: struct in6_multi *in6m = 0;
1.9 itojun 423:
424: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2 itojun 425: /*
426: * See if we belong to the destination multicast group on the
427: * arrival interface.
428: */
429: IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
430: if (in6m)
431: ours = 1;
432: else if (!ip6_mrouter) {
433: ip6stat.ip6s_notmember++;
434: ip6stat.ip6s_cantforward++;
1.9 itojun 435: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 436: goto bad;
437: }
1.9 itojun 438: deliverifp = m->m_pkthdr.rcvif;
1.2 itojun 439: goto hbhcheck;
440: }
441:
442: /*
443: * Unicast check
444: */
1.22 itojun 445: if (ip6_forward_rt.ro_rt != NULL &&
446: (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
447: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
448: &ip6_forward_rt.ro_dst.sin6_addr))
449: ; /* cache hit */
450: else {
1.2 itojun 451: if (ip6_forward_rt.ro_rt) {
1.22 itojun 452: /* route is down or destination is different */
1.2 itojun 453: RTFREE(ip6_forward_rt.ro_rt);
454: ip6_forward_rt.ro_rt = 0;
455: }
1.22 itojun 456:
1.2 itojun 457: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
458: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
459: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
460: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
461:
1.9 itojun 462: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 463: }
464:
465: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
466:
467: /*
468: * Accept the packet if the forwarding interface to the destination
469: * according to the routing table is the loopback interface,
470: * unless the associated route has a gateway.
471: * Note that this approach causes to accept a packet if there is a
472: * route to the loopback interface for the destination of the packet.
473: * But we think it's even useful in some situations, e.g. when using
474: * a special daemon which wants to intercept the packet.
475: */
476: if (ip6_forward_rt.ro_rt &&
477: (ip6_forward_rt.ro_rt->rt_flags &
478: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
479: #if 0
480: /*
481: * The check below is redundant since the comparison of
482: * the destination and the key of the rtentry has
483: * already done through looking up the routing table.
484: */
485: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
486: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
487: #endif
1.9 itojun 488: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 489: struct in6_ifaddr *ia6 =
490: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
491: /* packet to tentative address must not be received */
492: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
493: m->m_flags |= M_ANYCAST6;
494: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
495: /* this interface is ready */
496: ours = 1;
1.9 itojun 497: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 498: goto hbhcheck;
499: } else {
500: /* this interface is not ready, fall through */
501: }
502: }
503:
504: /*
505: * FAITH(Firewall Aided Internet Translator)
506: */
507: #if defined(NFAITH) && 0 < NFAITH
508: if (ip6_keepfaith) {
509: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
510: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
511: /* XXX do we need more sanity checks? */
512: ours = 1;
1.9 itojun 513: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
514: goto hbhcheck;
515: }
516: }
517: #endif
518:
519: #if 0
520: {
521: /*
522: * Last resort: check in6_ifaddr for incoming interface.
523: * The code is here until I update the "goto ours hack" code above
524: * working right.
525: */
526: struct ifaddr *ifa;
527: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
528: ifa;
529: ifa = ifa->ifa_list.tqe_next) {
530: if (ifa->ifa_addr == NULL)
531: continue; /* just for safety */
532: if (ifa->ifa_addr->sa_family != AF_INET6)
533: continue;
534: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
535: ours = 1;
536: deliverifp = ifa->ifa_ifp;
1.2 itojun 537: goto hbhcheck;
538: }
539: }
1.9 itojun 540: }
1.2 itojun 541: #endif
542:
543: /*
544: * Now there is no reason to process the packet if it's not our own
545: * and we're not a router.
546: */
547: if (!ip6_forwarding) {
548: ip6stat.ip6s_cantforward++;
1.9 itojun 549: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 550: goto bad;
551: }
552:
553: hbhcheck:
554: /*
555: * Process Hop-by-Hop options header if it's contained.
556: * m may be modified in ip6_hopopts_input().
557: * If a JumboPayload option is included, plen will also be modified.
558: */
559: plen = (u_int32_t)ntohs(ip6->ip6_plen);
560: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 561: struct ip6_hbh *hbh;
562:
563: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
564: #if 0 /*touches NULL pointer*/
565: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
566: #endif
1.2 itojun 567: return; /* m have already been freed */
1.9 itojun 568: }
1.22 itojun 569:
1.2 itojun 570: /* adjust pointer */
571: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 572:
573: /*
574: * if the payload length field is 0 and the next header field
575: * indicates Hop-by-Hop Options header, then a Jumbo Payload
576: * option MUST be included.
577: */
578: if (ip6->ip6_plen == 0 && plen == 0) {
579: /*
580: * Note that if a valid jumbo payload option is
581: * contained, ip6_hoptops_input() must set a valid
582: * (non-zero) payload length to the variable plen.
583: */
584: ip6stat.ip6s_badoptions++;
585: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
586: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
587: icmp6_error(m, ICMP6_PARAM_PROB,
588: ICMP6_PARAMPROB_HEADER,
589: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
590: return;
591: }
1.9 itojun 592: #ifndef PULLDOWN_TEST
593: /* ip6_hopopts_input() ensures that mbuf is contiguous */
594: hbh = (struct ip6_hbh *)(ip6 + 1);
595: #else
596: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
597: sizeof(struct ip6_hbh));
598: if (hbh == NULL) {
599: ip6stat.ip6s_tooshort++;
600: return;
601: }
602: #endif
603: nxt = hbh->ip6h_nxt;
1.2 itojun 604:
605: /*
606: * accept the packet if a router alert option is included
607: * and we act as an IPv6 router.
608: */
1.5 itojun 609: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 610: ours = 1;
611: } else
612: nxt = ip6->ip6_nxt;
613:
614: /*
615: * Check that the amount of data in the buffers
616: * is as at least much as the IPv6 header would have us expect.
617: * Trim mbufs if longer than we expect.
618: * Drop packet if shorter than we expect.
619: */
620: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
621: ip6stat.ip6s_tooshort++;
1.9 itojun 622: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 623: goto bad;
624: }
625: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
626: if (m->m_len == m->m_pkthdr.len) {
627: m->m_len = sizeof(struct ip6_hdr) + plen;
628: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
629: } else
630: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
631: }
632:
633: /*
634: * Forward if desirable.
635: */
636: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
637: /*
638: * If we are acting as a multicast router, all
639: * incoming multicast packets are passed to the
640: * kernel-level multicast forwarding function.
641: * The packet is returned (relatively) intact; if
642: * ip6_mforward() returns a non-zero value, the packet
643: * must be discarded, else it may be accepted below.
644: */
645: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
646: ip6stat.ip6s_cantforward++;
647: m_freem(m);
648: return;
649: }
650: if (!ours) {
651: m_freem(m);
652: return;
653: }
1.22 itojun 654: } else if (!ours) {
1.2 itojun 655: ip6_forward(m, 0);
656: return;
657: }
658:
659: /*
660: * Tell launch routine the next header
661: */
1.12 itojun 662: #ifdef IFA_STATS
1.9 itojun 663: if (IFA_STATS && deliverifp != NULL) {
664: struct in6_ifaddr *ia6;
665: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
666: if (ia6)
667: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
668: }
669: #endif
1.2 itojun 670: ip6stat.ip6s_delivered++;
1.9 itojun 671: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 672: nest = 0;
673: while (nxt != IPPROTO_DONE) {
674: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
675: ip6stat.ip6s_toomanyhdr++;
676: goto bad;
677: }
1.8 itojun 678:
679: /*
680: * protection against faulty packet - there should be
681: * more sanity checks in header chain processing.
682: */
683: if (m->m_pkthdr.len < off) {
684: ip6stat.ip6s_tooshort++;
1.9 itojun 685: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 686: goto bad;
687: }
688:
1.2 itojun 689: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
690: }
691: return;
692: bad:
693: m_freem(m);
694: }
695:
696: /*
697: * Hop-by-Hop options header processing. If a valid jumbo payload option is
698: * included, the real payload length will be stored in plenp.
699: */
700: static int
701: ip6_hopopts_input(plenp, rtalertp, mp, offp)
702: u_int32_t *plenp;
1.5 itojun 703: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 704: struct mbuf **mp;
705: int *offp;
706: {
707: register struct mbuf *m = *mp;
708: int off = *offp, hbhlen;
709: struct ip6_hbh *hbh;
710: u_int8_t *opt;
711:
712: /* validation of the length of the header */
1.9 itojun 713: #ifndef PULLDOWN_TEST
1.2 itojun 714: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
715: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
716: hbhlen = (hbh->ip6h_len + 1) << 3;
717:
718: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
719: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 720: #else
721: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
722: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
723: if (hbh == NULL) {
724: ip6stat.ip6s_tooshort++;
725: return -1;
726: }
727: hbhlen = (hbh->ip6h_len + 1) << 3;
728: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
729: hbhlen);
730: if (hbh == NULL) {
731: ip6stat.ip6s_tooshort++;
732: return -1;
733: }
734: #endif
1.2 itojun 735: off += hbhlen;
736: hbhlen -= sizeof(struct ip6_hbh);
737: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
738:
739: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
740: hbhlen, rtalertp, plenp) < 0)
741: return(-1);
742:
743: *offp = off;
744: *mp = m;
745: return(0);
746: }
747:
748: /*
749: * Search header for all Hop-by-hop options and process each option.
750: * This function is separate from ip6_hopopts_input() in order to
751: * handle a case where the sending node itself process its hop-by-hop
752: * options header. In such a case, the function is called from ip6_output().
753: */
754: int
755: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
756: struct mbuf *m;
757: u_int8_t *opthead;
758: int hbhlen;
1.5 itojun 759: u_int32_t *rtalertp;
1.2 itojun 760: u_int32_t *plenp;
761: {
762: struct ip6_hdr *ip6;
763: int optlen = 0;
764: u_int8_t *opt = opthead;
765: u_int16_t rtalert_val;
1.22 itojun 766: u_int32_t jumboplen;
1.2 itojun 767:
768: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
769: switch(*opt) {
770: case IP6OPT_PAD1:
771: optlen = 1;
772: break;
773: case IP6OPT_PADN:
774: if (hbhlen < IP6OPT_MINLEN) {
775: ip6stat.ip6s_toosmall++;
776: goto bad;
777: }
778: optlen = *(opt + 1) + 2;
779: break;
780: case IP6OPT_RTALERT:
1.8 itojun 781: /* XXX may need check for alignment */
1.2 itojun 782: if (hbhlen < IP6OPT_RTALERT_LEN) {
783: ip6stat.ip6s_toosmall++;
784: goto bad;
785: }
786: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
787: /* XXX: should we discard the packet? */
788: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
789: *(opt + 1));
790: optlen = IP6OPT_RTALERT_LEN;
791: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
792: *rtalertp = ntohs(rtalert_val);
793: break;
794: case IP6OPT_JUMBO:
1.22 itojun 795: /* XXX may need check for alignment */
796: if (hbhlen < IP6OPT_JUMBO_LEN) {
797: ip6stat.ip6s_toosmall++;
798: goto bad;
799: }
800: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
801: /* XXX: should we discard the packet? */
802: log(LOG_ERR, "length of jumbopayload opt "
803: "is inconsistent(%d)",
804: *(opt + 1));
805: optlen = IP6OPT_JUMBO_LEN;
806:
807: /*
808: * IPv6 packets that have non 0 payload length
809: * must not contain a jumbo paylod option.
810: */
811: ip6 = mtod(m, struct ip6_hdr *);
812: if (ip6->ip6_plen) {
813: ip6stat.ip6s_badoptions++;
814: icmp6_error(m, ICMP6_PARAM_PROB,
815: ICMP6_PARAMPROB_HEADER,
816: sizeof(struct ip6_hdr) +
817: sizeof(struct ip6_hbh) +
818: opt - opthead);
819: return(-1);
820: }
1.2 itojun 821:
1.22 itojun 822: /*
823: * We may see jumbolen in unaligned location, so
824: * we'd need to perform bcopy().
825: */
826: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
827: jumboplen = (u_int32_t)htonl(jumboplen);
828:
829: #if 1
830: /*
831: * if there are multiple jumbo payload options,
832: * *plenp will be non-zero and the packet will be
833: * rejected.
834: * the behavior may need some debate in ipngwg -
835: * multiple options does not make sense, however,
836: * there's no explicit mention in specification.
837: */
838: if (*plenp != 0) {
839: ip6stat.ip6s_badoptions++;
840: icmp6_error(m, ICMP6_PARAM_PROB,
841: ICMP6_PARAMPROB_HEADER,
842: sizeof(struct ip6_hdr) +
843: sizeof(struct ip6_hbh) +
844: opt + 2 - opthead);
845: return(-1);
846: }
1.8 itojun 847: #endif
1.2 itojun 848:
1.22 itojun 849: /*
850: * jumbo payload length must be larger than 65535.
851: */
852: if (jumboplen <= IPV6_MAXPACKET) {
853: ip6stat.ip6s_badoptions++;
854: icmp6_error(m, ICMP6_PARAM_PROB,
855: ICMP6_PARAMPROB_HEADER,
856: sizeof(struct ip6_hdr) +
857: sizeof(struct ip6_hbh) +
858: opt + 2 - opthead);
859: return(-1);
860: }
861: *plenp = jumboplen;
862:
863: break;
1.2 itojun 864: default: /* unknown option */
865: if (hbhlen < IP6OPT_MINLEN) {
866: ip6stat.ip6s_toosmall++;
867: goto bad;
868: }
869: if ((optlen = ip6_unknown_opt(opt, m,
870: sizeof(struct ip6_hdr) +
871: sizeof(struct ip6_hbh) +
872: opt - opthead)) == -1)
873: return(-1);
874: optlen += 2;
875: break;
876: }
877: }
878:
879: return(0);
880:
881: bad:
882: m_freem(m);
883: return(-1);
884: }
885:
886: /*
887: * Unknown option processing.
888: * The third argument `off' is the offset from the IPv6 header to the option,
889: * which is necessary if the IPv6 header the and option header and IPv6 header
890: * is not continuous in order to return an ICMPv6 error.
891: */
892: int
893: ip6_unknown_opt(optp, m, off)
894: u_int8_t *optp;
895: struct mbuf *m;
896: int off;
897: {
898: struct ip6_hdr *ip6;
899:
900: switch(IP6OPT_TYPE(*optp)) {
901: case IP6OPT_TYPE_SKIP: /* ignore the option */
902: return((int)*(optp + 1));
903: case IP6OPT_TYPE_DISCARD: /* silently discard */
904: m_freem(m);
905: return(-1);
906: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
907: ip6stat.ip6s_badoptions++;
908: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
909: return(-1);
910: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
911: ip6stat.ip6s_badoptions++;
912: ip6 = mtod(m, struct ip6_hdr *);
913: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
914: (m->m_flags & (M_BCAST|M_MCAST)))
915: m_freem(m);
916: else
917: icmp6_error(m, ICMP6_PARAM_PROB,
918: ICMP6_PARAMPROB_OPTION, off);
919: return(-1);
920: }
921:
922: m_freem(m); /* XXX: NOTREACHED */
923: return(-1);
924: }
925:
926: /*
1.9 itojun 927: * Create the "control" list for this pcb.
928: *
929: * The routine will be called from upper layer handlers like tcp6_input().
930: * Thus the routine assumes that the caller (tcp6_input) have already
931: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
932: * very first mbuf on the mbuf chain.
933: * We may want to add some infinite loop prevention or sanity checks for safety.
934: * (This applies only when you are using KAME mbuf chain restriction, i.e.
935: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 936: */
937: void
938: ip6_savecontrol(in6p, mp, ip6, m)
939: register struct in6pcb *in6p;
940: register struct mbuf **mp;
941: register struct ip6_hdr *ip6;
942: register struct mbuf *m;
943: {
944: struct proc *p = curproc; /* XXX */
1.9 itojun 945: int privileged;
1.2 itojun 946:
1.9 itojun 947: privileged = 0;
948: if (p && !suser(p->p_ucred, &p->p_acflag))
949: privileged++;
950:
951: #ifdef SO_TIMESTAMP
1.2 itojun 952: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
953: struct timeval tv;
954:
955: microtime(&tv);
956: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
957: SCM_TIMESTAMP, SOL_SOCKET);
958: if (*mp)
959: mp = &(*mp)->m_next;
960: }
1.9 itojun 961: #endif
1.2 itojun 962: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
963: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
964: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
965: IPPROTO_IPV6);
966: if (*mp)
967: mp = &(*mp)->m_next;
968: }
969:
970: #ifdef noyet
971: /* options were tossed above */
972: if (in6p->in6p_flags & IN6P_RECVOPTS)
973: /* broken */
974: /* ip6_srcroute doesn't do what we want here, need to fix */
975: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
976: /* broken */
977: #endif
978:
979: /* RFC 2292 sec. 5 */
980: if (in6p->in6p_flags & IN6P_PKTINFO) {
981: struct in6_pktinfo pi6;
982: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
983: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
984: pi6.ipi6_addr.s6_addr16[1] = 0;
985: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
986: ? m->m_pkthdr.rcvif->if_index
987: : 0;
988: *mp = sbcreatecontrol((caddr_t) &pi6,
989: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
990: IPPROTO_IPV6);
991: if (*mp)
992: mp = &(*mp)->m_next;
993: }
994: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
995: int hlim = ip6->ip6_hlim & 0xff;
996: *mp = sbcreatecontrol((caddr_t) &hlim,
997: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
998: if (*mp)
999: mp = &(*mp)->m_next;
1000: }
1001: /* IN6P_NEXTHOP - for outgoing packet only */
1002:
1003: /*
1004: * IPV6_HOPOPTS socket option. We require super-user privilege
1005: * for the option, but it might be too strict, since there might
1006: * be some hop-by-hop options which can be returned to normal user.
1007: * See RFC 2292 section 6.
1008: */
1.9 itojun 1009: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1010: /*
1011: * Check if a hop-by-hop options header is contatined in the
1012: * received packet, and if so, store the options as ancillary
1013: * data. Note that a hop-by-hop options header must be
1014: * just after the IPv6 header, which fact is assured through
1015: * the IPv6 input processing.
1016: */
1017: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1018: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1019: struct ip6_hbh *hbh;
1020: int hbhlen;
1021:
1022: #ifndef PULLDOWN_TEST
1023: hbh = (struct ip6_hbh *)(ip6 + 1);
1024: hbhlen = (hbh->ip6h_len + 1) << 3;
1025: #else
1026: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1027: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1028: if (hbh == NULL) {
1029: ip6stat.ip6s_tooshort++;
1030: return;
1031: }
1032: hbhlen = (hbh->ip6h_len + 1) << 3;
1033: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1034: sizeof(struct ip6_hdr), hbhlen);
1035: if (hbh == NULL) {
1036: ip6stat.ip6s_tooshort++;
1037: return;
1038: }
1039: #endif
1.2 itojun 1040:
1041: /*
1042: * XXX: We copy whole the header even if a jumbo
1043: * payload option is included, which option is to
1044: * be removed before returning in the RFC 2292.
1045: * But it's too painful operation...
1046: */
1.9 itojun 1047: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1048: IPV6_HOPOPTS, IPPROTO_IPV6);
1049: if (*mp)
1050: mp = &(*mp)->m_next;
1051: }
1052: }
1053:
1054: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1055: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1056: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1057: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1058:
1059: /*
1060: * Search for destination options headers or routing
1061: * header(s) through the header chain, and stores each
1062: * header as ancillary data.
1063: * Note that the order of the headers remains in
1064: * the chain of ancillary data.
1065: */
1066: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1067: struct ip6_ext *ip6e;
1068: int elen;
1069:
1070: #ifndef PULLDOWN_TEST
1071: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1072: if (nxt == IPPROTO_AH)
1073: elen = (ip6e->ip6e_len + 2) << 2;
1074: else
1075: elen = (ip6e->ip6e_len + 1) << 3;
1076: #else
1077: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1078: sizeof(struct ip6_ext));
1079: if (ip6e == NULL) {
1080: ip6stat.ip6s_tooshort++;
1081: return;
1082: }
1083: if (nxt == IPPROTO_AH)
1084: elen = (ip6e->ip6e_len + 2) << 2;
1085: else
1086: elen = (ip6e->ip6e_len + 1) << 3;
1087: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1088: if (ip6e == NULL) {
1089: ip6stat.ip6s_tooshort++;
1090: return;
1091: }
1092: #endif
1.2 itojun 1093:
1094: switch(nxt) {
1095: case IPPROTO_DSTOPTS:
1096: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1097: break;
1098:
1099: /*
1100: * We also require super-user privilege for
1101: * the option.
1102: * See the comments on IN6_HOPOPTS.
1103: */
1.9 itojun 1104: if (!privileged)
1.2 itojun 1105: break;
1106:
1.9 itojun 1107: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1108: IPV6_DSTOPTS,
1109: IPPROTO_IPV6);
1110: if (*mp)
1111: mp = &(*mp)->m_next;
1112: break;
1113:
1114: case IPPROTO_ROUTING:
1115: if (!in6p->in6p_flags & IN6P_RTHDR)
1116: break;
1117:
1.9 itojun 1118: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1119: IPV6_RTHDR,
1120: IPPROTO_IPV6);
1121: if (*mp)
1122: mp = &(*mp)->m_next;
1123: break;
1124:
1125: case IPPROTO_UDP:
1126: case IPPROTO_TCP:
1127: case IPPROTO_ICMPV6:
1128: default:
1129: /*
1130: * stop search if we encounter an upper
1131: * layer protocol headers.
1132: */
1133: goto loopend;
1134:
1135: case IPPROTO_HOPOPTS:
1136: case IPPROTO_AH: /* is it possible? */
1137: break;
1138: }
1139:
1140: /* proceed with the next header. */
1.9 itojun 1141: off += elen;
1.2 itojun 1142: nxt = ip6e->ip6e_nxt;
1143: }
1144: loopend:
1145: }
1.9 itojun 1146: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1147: /* to be done */
1148: }
1.9 itojun 1149: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1150: /* to be done */
1151: }
1152: /* IN6P_RTHDR - to be done */
1153:
1154: }
1155:
1156: /*
1157: * Get pointer to the previous header followed by the header
1158: * currently processed.
1159: * XXX: This function supposes that
1160: * M includes all headers,
1161: * the next header field and the header length field of each header
1162: * are valid, and
1163: * the sum of each header length equals to OFF.
1164: * Because of these assumptions, this function must be called very
1165: * carefully. Moreover, it will not be used in the near future when
1166: * we develop `neater' mechanism to process extension headers.
1167: */
1168: char *
1169: ip6_get_prevhdr(m, off)
1170: struct mbuf *m;
1171: int off;
1172: {
1173: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1174:
1175: if (off == sizeof(struct ip6_hdr))
1176: return(&ip6->ip6_nxt);
1177: else {
1178: int len, nxt;
1179: struct ip6_ext *ip6e = NULL;
1180:
1181: nxt = ip6->ip6_nxt;
1182: len = sizeof(struct ip6_hdr);
1183: while (len < off) {
1184: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1185:
1186: switch(nxt) {
1187: case IPPROTO_FRAGMENT:
1188: len += sizeof(struct ip6_frag);
1189: break;
1190: case IPPROTO_AH:
1191: len += (ip6e->ip6e_len + 2) << 2;
1192: break;
1193: default:
1194: len += (ip6e->ip6e_len + 1) << 3;
1195: break;
1196: }
1197: nxt = ip6e->ip6e_nxt;
1198: }
1199: if (ip6e)
1200: return(&ip6e->ip6e_nxt);
1201: else
1202: return NULL;
1.18 itojun 1203: }
1204: }
1205:
1206: /*
1207: * get next header offset. m will be retained.
1208: */
1209: int
1210: ip6_nexthdr(m, off, proto, nxtp)
1211: struct mbuf *m;
1212: int off;
1213: int proto;
1214: int *nxtp;
1215: {
1216: struct ip6_hdr ip6;
1217: struct ip6_ext ip6e;
1218: struct ip6_frag fh;
1219:
1220: /* just in case */
1221: if (m == NULL)
1222: panic("ip6_nexthdr: m == NULL");
1223: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1224: return -1;
1225:
1226: switch (proto) {
1227: case IPPROTO_IPV6:
1228: if (m->m_pkthdr.len < off + sizeof(ip6))
1229: return -1;
1230: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1231: if (nxtp)
1232: *nxtp = ip6.ip6_nxt;
1233: off += sizeof(ip6);
1234: return off;
1235:
1236: case IPPROTO_FRAGMENT:
1237: /*
1238: * terminate parsing if it is not the first fragment,
1239: * it does not make sense to parse through it.
1240: */
1241: if (m->m_pkthdr.len < off + sizeof(fh))
1242: return -1;
1243: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1244: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1245: return -1;
1246: if (nxtp)
1247: *nxtp = fh.ip6f_nxt;
1248: off += sizeof(struct ip6_frag);
1249: return off;
1250:
1251: case IPPROTO_AH:
1252: if (m->m_pkthdr.len < off + sizeof(ip6e))
1253: return -1;
1254: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1255: if (nxtp)
1256: *nxtp = ip6e.ip6e_nxt;
1257: off += (ip6e.ip6e_len + 2) << 2;
1258: return off;
1259:
1260: case IPPROTO_HOPOPTS:
1261: case IPPROTO_ROUTING:
1262: case IPPROTO_DSTOPTS:
1263: if (m->m_pkthdr.len < off + sizeof(ip6e))
1264: return -1;
1265: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1266: if (nxtp)
1267: *nxtp = ip6e.ip6e_nxt;
1268: off += (ip6e.ip6e_len + 1) << 3;
1269: return off;
1270:
1271: case IPPROTO_NONE:
1272: case IPPROTO_ESP:
1273: case IPPROTO_IPCOMP:
1274: /* give up */
1275: return -1;
1276:
1277: default:
1278: return -1;
1279: }
1280:
1281: return -1;
1282: }
1283:
1284: /*
1285: * get offset for the last header in the chain. m will be kept untainted.
1286: */
1287: int
1288: ip6_lasthdr(m, off, proto, nxtp)
1289: struct mbuf *m;
1290: int off;
1291: int proto;
1292: int *nxtp;
1293: {
1294: int newoff;
1295: int nxt;
1296:
1297: if (!nxtp) {
1298: nxt = -1;
1299: nxtp = &nxt;
1300: }
1301: while (1) {
1302: newoff = ip6_nexthdr(m, off, proto, nxtp);
1303: if (newoff < 0)
1304: return off;
1305: else if (newoff < off)
1306: return -1; /* invalid */
1307: else if (newoff == off)
1308: return newoff;
1309:
1310: off = newoff;
1311: proto = *nxtp;
1.2 itojun 1312: }
1313: }
1314:
1315: /*
1316: * System control for IP6
1317: */
1318:
1319: u_char inet6ctlerrmap[PRC_NCMDS] = {
1320: 0, 0, 0, 0,
1321: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1322: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1323: EMSGSIZE, EHOSTUNREACH, 0, 0,
1324: 0, 0, 0, 0,
1325: ENOPROTOOPT
1326: };
1327:
1.23 ! mrg 1328: #include <uvm/uvm_extern.h>
1.2 itojun 1329: #include <sys/sysctl.h>
1330:
1331: int
1332: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1333: int *name;
1334: u_int namelen;
1335: void *oldp;
1336: size_t *oldlenp;
1337: void *newp;
1338: size_t newlen;
1339: {
1340: /* All sysctl names at this level are terminal. */
1341: if (namelen != 1)
1342: return ENOTDIR;
1343:
1344: switch (name[0]) {
1345:
1346: case IPV6CTL_FORWARDING:
1347: return sysctl_int(oldp, oldlenp, newp, newlen,
1348: &ip6_forwarding);
1349: case IPV6CTL_SENDREDIRECTS:
1350: return sysctl_int(oldp, oldlenp, newp, newlen,
1351: &ip6_sendredirects);
1352: case IPV6CTL_DEFHLIM:
1353: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1354: case IPV6CTL_MAXFRAGPACKETS:
1355: return sysctl_int(oldp, oldlenp, newp, newlen,
1356: &ip6_maxfragpackets);
1357: case IPV6CTL_ACCEPT_RTADV:
1358: return sysctl_int(oldp, oldlenp, newp, newlen,
1359: &ip6_accept_rtadv);
1360: case IPV6CTL_KEEPFAITH:
1361: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1362: case IPV6CTL_LOG_INTERVAL:
1363: return sysctl_int(oldp, oldlenp, newp, newlen,
1364: &ip6_log_interval);
1365: case IPV6CTL_HDRNESTLIMIT:
1366: return sysctl_int(oldp, oldlenp, newp, newlen,
1367: &ip6_hdrnestlimit);
1368: case IPV6CTL_DAD_COUNT:
1369: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1370: case IPV6CTL_AUTO_FLOWLABEL:
1371: return sysctl_int(oldp, oldlenp, newp, newlen,
1372: &ip6_auto_flowlabel);
1373: case IPV6CTL_DEFMCASTHLIM:
1374: return sysctl_int(oldp, oldlenp, newp, newlen,
1375: &ip6_defmcasthlim);
1376: case IPV6CTL_GIF_HLIM:
1377: return sysctl_int(oldp, oldlenp, newp, newlen,
1378: &ip6_gif_hlim);
1379: case IPV6CTL_KAME_VERSION:
1380: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1381: case IPV6CTL_USE_DEPRECATED:
1382: return sysctl_int(oldp, oldlenp, newp, newlen,
1383: &ip6_use_deprecated);
1.10 itojun 1384: case IPV6CTL_RR_PRUNE:
1385: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1386: #ifndef INET6_BINDV6ONLY
1.11 itojun 1387: case IPV6CTL_BINDV6ONLY:
1388: return sysctl_int(oldp, oldlenp, newp, newlen,
1389: &ip6_bindv6only);
1390: #endif
1.2 itojun 1391: default:
1392: return EOPNOTSUPP;
1393: }
1394: /* NOTREACHED */
1395: }
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