Annotation of src/sys/netinet6/ip6_input.c, Revision 1.26
1.26 ! itojun 1: /* $NetBSD: ip6_input.c,v 1.25 2000/07/06 12:36:19 itojun Exp $ */
! 2: /* $KAME: ip6_input.c,v 1.119 2000/08/26 10:00:45 itojun Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.21 itojun 7: *
1.2 itojun 8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
1.21 itojun 19: *
1.2 itojun 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1988, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. All advertising materials mentioning features or use of this software
46: * must display the following acknowledgement:
47: * This product includes software developed by the University of
48: * California, Berkeley and its contributors.
49: * 4. Neither the name of the University nor the names of its contributors
50: * may be used to endorse or promote products derived from this software
51: * without specific prior written permission.
52: *
53: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: * SUCH DAMAGE.
64: *
65: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
66: */
67:
68: #include "opt_inet.h"
1.4 thorpej 69: #include "opt_ipsec.h"
1.15 darrenr 70: #include "opt_pfil_hooks.h"
1.2 itojun 71:
72: #include <sys/param.h>
73: #include <sys/systm.h>
74: #include <sys/malloc.h>
75: #include <sys/mbuf.h>
76: #include <sys/domain.h>
77: #include <sys/protosw.h>
78: #include <sys/socket.h>
79: #include <sys/socketvar.h>
80: #include <sys/errno.h>
81: #include <sys/time.h>
82: #include <sys/kernel.h>
83: #include <sys/syslog.h>
84: #include <sys/proc.h>
85:
86: #include <net/if.h>
87: #include <net/if_types.h>
88: #include <net/if_dl.h>
89: #include <net/route.h>
90: #include <net/netisr.h>
1.15 darrenr 91: #ifdef PFIL_HOOKS
92: #include <net/pfil.h>
93: #endif
1.2 itojun 94:
95: #include <netinet/in.h>
1.9 itojun 96: #include <netinet/in_systm.h>
97: #ifdef INET
98: #include <netinet/ip.h>
99: #include <netinet/ip_icmp.h>
100: #endif /*INET*/
1.14 itojun 101: #include <netinet/ip6.h>
1.2 itojun 102: #include <netinet6/in6_var.h>
1.11 itojun 103: #include <netinet6/ip6_var.h>
1.2 itojun 104: #include <netinet6/in6_pcb.h>
1.14 itojun 105: #include <netinet/icmp6.h>
1.2 itojun 106: #include <netinet6/in6_ifattach.h>
107: #include <netinet6/nd6.h>
1.9 itojun 108: #include <netinet6/in6_prefix.h>
1.2 itojun 109:
1.9 itojun 110: #ifdef IPV6FIREWALL
111: #include <netinet6/ip6_fw.h>
112: #endif
1.2 itojun 113:
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))
1.25 itojun 449: ip6stat.ip6s_forward_cachehit++;
1.22 itojun 450: else {
1.2 itojun 451: if (ip6_forward_rt.ro_rt) {
1.22 itojun 452: /* route is down or destination is different */
1.25 itojun 453: ip6stat.ip6s_forward_cachemiss++;
1.2 itojun 454: RTFREE(ip6_forward_rt.ro_rt);
455: ip6_forward_rt.ro_rt = 0;
456: }
1.22 itojun 457:
1.2 itojun 458: bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
459: ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
460: ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
461: ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
462:
1.9 itojun 463: rtalloc((struct route *)&ip6_forward_rt);
1.2 itojun 464: }
465:
466: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
467:
468: /*
469: * Accept the packet if the forwarding interface to the destination
470: * according to the routing table is the loopback interface,
471: * unless the associated route has a gateway.
472: * Note that this approach causes to accept a packet if there is a
473: * route to the loopback interface for the destination of the packet.
474: * But we think it's even useful in some situations, e.g. when using
475: * a special daemon which wants to intercept the packet.
476: */
477: if (ip6_forward_rt.ro_rt &&
478: (ip6_forward_rt.ro_rt->rt_flags &
479: (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
480: #if 0
481: /*
482: * The check below is redundant since the comparison of
483: * the destination and the key of the rtentry has
484: * already done through looking up the routing table.
485: */
486: IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
487: &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
488: #endif
1.9 itojun 489: ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2 itojun 490: struct in6_ifaddr *ia6 =
491: (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
492: if (ia6->ia6_flags & IN6_IFF_ANYCAST)
493: m->m_flags |= M_ANYCAST6;
1.24 itojun 494: /*
495: * packets to a tentative, duplicated, or somehow invalid
496: * address must not be accepted.
497: */
1.2 itojun 498: if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24 itojun 499: /* this address is ready */
1.2 itojun 500: ours = 1;
1.9 itojun 501: deliverifp = ia6->ia_ifp; /* correct? */
1.2 itojun 502: goto hbhcheck;
503: } else {
1.24 itojun 504: /* address is not ready, so discard the packet. */
505: log(LOG_INFO,
506: "ip6_input: packet to an unready address %s->%s",
507: ip6_sprintf(&ip6->ip6_src),
508: ip6_sprintf(&ip6->ip6_dst));
509:
510: goto bad;
1.2 itojun 511: }
512: }
513:
514: /*
515: * FAITH(Firewall Aided Internet Translator)
516: */
517: #if defined(NFAITH) && 0 < NFAITH
518: if (ip6_keepfaith) {
519: if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
520: && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
521: /* XXX do we need more sanity checks? */
522: ours = 1;
1.9 itojun 523: deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
524: goto hbhcheck;
525: }
526: }
527: #endif
528:
529: #if 0
530: {
531: /*
532: * Last resort: check in6_ifaddr for incoming interface.
533: * The code is here until I update the "goto ours hack" code above
534: * working right.
535: */
536: struct ifaddr *ifa;
537: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
538: ifa;
539: ifa = ifa->ifa_list.tqe_next) {
540: if (ifa->ifa_addr == NULL)
541: continue; /* just for safety */
542: if (ifa->ifa_addr->sa_family != AF_INET6)
543: continue;
544: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
545: ours = 1;
546: deliverifp = ifa->ifa_ifp;
1.2 itojun 547: goto hbhcheck;
548: }
549: }
1.9 itojun 550: }
1.2 itojun 551: #endif
552:
553: /*
554: * Now there is no reason to process the packet if it's not our own
555: * and we're not a router.
556: */
557: if (!ip6_forwarding) {
558: ip6stat.ip6s_cantforward++;
1.9 itojun 559: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2 itojun 560: goto bad;
561: }
562:
563: hbhcheck:
564: /*
565: * Process Hop-by-Hop options header if it's contained.
566: * m may be modified in ip6_hopopts_input().
567: * If a JumboPayload option is included, plen will also be modified.
568: */
569: plen = (u_int32_t)ntohs(ip6->ip6_plen);
570: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 571: struct ip6_hbh *hbh;
572:
573: if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
574: #if 0 /*touches NULL pointer*/
575: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
576: #endif
1.2 itojun 577: return; /* m have already been freed */
1.9 itojun 578: }
1.22 itojun 579:
1.2 itojun 580: /* adjust pointer */
581: ip6 = mtod(m, struct ip6_hdr *);
1.22 itojun 582:
583: /*
584: * if the payload length field is 0 and the next header field
585: * indicates Hop-by-Hop Options header, then a Jumbo Payload
586: * option MUST be included.
587: */
588: if (ip6->ip6_plen == 0 && plen == 0) {
589: /*
590: * Note that if a valid jumbo payload option is
591: * contained, ip6_hoptops_input() must set a valid
592: * (non-zero) payload length to the variable plen.
593: */
594: ip6stat.ip6s_badoptions++;
595: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
596: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
597: icmp6_error(m, ICMP6_PARAM_PROB,
598: ICMP6_PARAMPROB_HEADER,
599: (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
600: return;
601: }
1.9 itojun 602: #ifndef PULLDOWN_TEST
603: /* ip6_hopopts_input() ensures that mbuf is contiguous */
604: hbh = (struct ip6_hbh *)(ip6 + 1);
605: #else
606: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
607: sizeof(struct ip6_hbh));
608: if (hbh == NULL) {
609: ip6stat.ip6s_tooshort++;
610: return;
611: }
612: #endif
613: nxt = hbh->ip6h_nxt;
1.2 itojun 614:
615: /*
616: * accept the packet if a router alert option is included
617: * and we act as an IPv6 router.
618: */
1.5 itojun 619: if (rtalert != ~0 && ip6_forwarding)
1.2 itojun 620: ours = 1;
621: } else
622: nxt = ip6->ip6_nxt;
623:
624: /*
625: * Check that the amount of data in the buffers
626: * is as at least much as the IPv6 header would have us expect.
627: * Trim mbufs if longer than we expect.
628: * Drop packet if shorter than we expect.
629: */
630: if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
631: ip6stat.ip6s_tooshort++;
1.9 itojun 632: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2 itojun 633: goto bad;
634: }
635: if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
636: if (m->m_len == m->m_pkthdr.len) {
637: m->m_len = sizeof(struct ip6_hdr) + plen;
638: m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
639: } else
640: m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
641: }
642:
643: /*
644: * Forward if desirable.
645: */
646: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
647: /*
648: * If we are acting as a multicast router, all
649: * incoming multicast packets are passed to the
650: * kernel-level multicast forwarding function.
651: * The packet is returned (relatively) intact; if
652: * ip6_mforward() returns a non-zero value, the packet
653: * must be discarded, else it may be accepted below.
654: */
655: if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
656: ip6stat.ip6s_cantforward++;
657: m_freem(m);
658: return;
659: }
660: if (!ours) {
661: m_freem(m);
662: return;
663: }
1.22 itojun 664: } else if (!ours) {
1.2 itojun 665: ip6_forward(m, 0);
666: return;
667: }
1.25 itojun 668:
669: ip6 = mtod(m, struct ip6_hdr *);
670:
671: /*
672: * Malicious party may be able to use IPv4 mapped addr to confuse
673: * tcp/udp stack and bypass security checks (act as if it was from
674: * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
675: *
676: * For SIIT end node behavior, you may want to disable the check.
677: * However, you will become vulnerable to attacks using IPv4 mapped
678: * source.
679: */
680: if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
681: IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
682: ip6stat.ip6s_badscope++;
683: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
684: goto bad;
685: }
1.2 itojun 686:
687: /*
688: * Tell launch routine the next header
689: */
1.12 itojun 690: #ifdef IFA_STATS
1.9 itojun 691: if (IFA_STATS && deliverifp != NULL) {
692: struct in6_ifaddr *ia6;
693: ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
694: if (ia6)
695: ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
696: }
697: #endif
1.2 itojun 698: ip6stat.ip6s_delivered++;
1.9 itojun 699: in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2 itojun 700: nest = 0;
701: while (nxt != IPPROTO_DONE) {
702: if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
703: ip6stat.ip6s_toomanyhdr++;
704: goto bad;
705: }
1.8 itojun 706:
707: /*
708: * protection against faulty packet - there should be
709: * more sanity checks in header chain processing.
710: */
711: if (m->m_pkthdr.len < off) {
712: ip6stat.ip6s_tooshort++;
1.9 itojun 713: in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8 itojun 714: goto bad;
715: }
716:
1.2 itojun 717: nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
718: }
719: return;
720: bad:
721: m_freem(m);
722: }
723:
724: /*
725: * Hop-by-Hop options header processing. If a valid jumbo payload option is
726: * included, the real payload length will be stored in plenp.
727: */
728: static int
729: ip6_hopopts_input(plenp, rtalertp, mp, offp)
730: u_int32_t *plenp;
1.5 itojun 731: u_int32_t *rtalertp; /* XXX: should be stored more smart way */
1.2 itojun 732: struct mbuf **mp;
733: int *offp;
734: {
735: register struct mbuf *m = *mp;
736: int off = *offp, hbhlen;
737: struct ip6_hbh *hbh;
738: u_int8_t *opt;
739:
740: /* validation of the length of the header */
1.9 itojun 741: #ifndef PULLDOWN_TEST
1.2 itojun 742: IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
743: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
744: hbhlen = (hbh->ip6h_len + 1) << 3;
745:
746: IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
747: hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9 itojun 748: #else
749: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
750: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
751: if (hbh == NULL) {
752: ip6stat.ip6s_tooshort++;
753: return -1;
754: }
755: hbhlen = (hbh->ip6h_len + 1) << 3;
756: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
757: hbhlen);
758: if (hbh == NULL) {
759: ip6stat.ip6s_tooshort++;
760: return -1;
761: }
762: #endif
1.2 itojun 763: off += hbhlen;
764: hbhlen -= sizeof(struct ip6_hbh);
765: opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
766:
767: if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
768: hbhlen, rtalertp, plenp) < 0)
769: return(-1);
770:
771: *offp = off;
772: *mp = m;
773: return(0);
774: }
775:
776: /*
777: * Search header for all Hop-by-hop options and process each option.
778: * This function is separate from ip6_hopopts_input() in order to
779: * handle a case where the sending node itself process its hop-by-hop
780: * options header. In such a case, the function is called from ip6_output().
781: */
782: int
783: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
784: struct mbuf *m;
785: u_int8_t *opthead;
786: int hbhlen;
1.5 itojun 787: u_int32_t *rtalertp;
1.2 itojun 788: u_int32_t *plenp;
789: {
790: struct ip6_hdr *ip6;
791: int optlen = 0;
792: u_int8_t *opt = opthead;
793: u_int16_t rtalert_val;
1.22 itojun 794: u_int32_t jumboplen;
1.2 itojun 795:
796: for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
797: switch(*opt) {
798: case IP6OPT_PAD1:
799: optlen = 1;
800: break;
801: case IP6OPT_PADN:
802: if (hbhlen < IP6OPT_MINLEN) {
803: ip6stat.ip6s_toosmall++;
804: goto bad;
805: }
806: optlen = *(opt + 1) + 2;
807: break;
808: case IP6OPT_RTALERT:
1.8 itojun 809: /* XXX may need check for alignment */
1.2 itojun 810: if (hbhlen < IP6OPT_RTALERT_LEN) {
811: ip6stat.ip6s_toosmall++;
812: goto bad;
813: }
814: if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
815: /* XXX: should we discard the packet? */
816: log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
817: *(opt + 1));
818: optlen = IP6OPT_RTALERT_LEN;
819: bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
820: *rtalertp = ntohs(rtalert_val);
821: break;
822: case IP6OPT_JUMBO:
1.22 itojun 823: /* XXX may need check for alignment */
824: if (hbhlen < IP6OPT_JUMBO_LEN) {
825: ip6stat.ip6s_toosmall++;
826: goto bad;
827: }
828: if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
829: /* XXX: should we discard the packet? */
830: log(LOG_ERR, "length of jumbopayload opt "
831: "is inconsistent(%d)",
832: *(opt + 1));
833: optlen = IP6OPT_JUMBO_LEN;
834:
835: /*
836: * IPv6 packets that have non 0 payload length
837: * must not contain a jumbo paylod option.
838: */
839: ip6 = mtod(m, struct ip6_hdr *);
840: if (ip6->ip6_plen) {
841: ip6stat.ip6s_badoptions++;
842: icmp6_error(m, ICMP6_PARAM_PROB,
843: ICMP6_PARAMPROB_HEADER,
844: sizeof(struct ip6_hdr) +
845: sizeof(struct ip6_hbh) +
846: opt - opthead);
847: return(-1);
848: }
1.2 itojun 849:
1.22 itojun 850: /*
851: * We may see jumbolen in unaligned location, so
852: * we'd need to perform bcopy().
853: */
854: bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
855: jumboplen = (u_int32_t)htonl(jumboplen);
856:
857: #if 1
858: /*
859: * if there are multiple jumbo payload options,
860: * *plenp will be non-zero and the packet will be
861: * rejected.
862: * the behavior may need some debate in ipngwg -
863: * multiple options does not make sense, however,
864: * there's no explicit mention in specification.
865: */
866: if (*plenp != 0) {
867: ip6stat.ip6s_badoptions++;
868: icmp6_error(m, ICMP6_PARAM_PROB,
869: ICMP6_PARAMPROB_HEADER,
870: sizeof(struct ip6_hdr) +
871: sizeof(struct ip6_hbh) +
872: opt + 2 - opthead);
873: return(-1);
874: }
1.8 itojun 875: #endif
1.2 itojun 876:
1.22 itojun 877: /*
878: * jumbo payload length must be larger than 65535.
879: */
880: if (jumboplen <= IPV6_MAXPACKET) {
881: ip6stat.ip6s_badoptions++;
882: icmp6_error(m, ICMP6_PARAM_PROB,
883: ICMP6_PARAMPROB_HEADER,
884: sizeof(struct ip6_hdr) +
885: sizeof(struct ip6_hbh) +
886: opt + 2 - opthead);
887: return(-1);
888: }
889: *plenp = jumboplen;
890:
891: break;
1.2 itojun 892: default: /* unknown option */
893: if (hbhlen < IP6OPT_MINLEN) {
894: ip6stat.ip6s_toosmall++;
895: goto bad;
896: }
897: if ((optlen = ip6_unknown_opt(opt, m,
898: sizeof(struct ip6_hdr) +
899: sizeof(struct ip6_hbh) +
900: opt - opthead)) == -1)
901: return(-1);
902: optlen += 2;
903: break;
904: }
905: }
906:
907: return(0);
908:
909: bad:
910: m_freem(m);
911: return(-1);
912: }
913:
914: /*
915: * Unknown option processing.
916: * The third argument `off' is the offset from the IPv6 header to the option,
917: * which is necessary if the IPv6 header the and option header and IPv6 header
918: * is not continuous in order to return an ICMPv6 error.
919: */
920: int
921: ip6_unknown_opt(optp, m, off)
922: u_int8_t *optp;
923: struct mbuf *m;
924: int off;
925: {
926: struct ip6_hdr *ip6;
927:
928: switch(IP6OPT_TYPE(*optp)) {
929: case IP6OPT_TYPE_SKIP: /* ignore the option */
930: return((int)*(optp + 1));
931: case IP6OPT_TYPE_DISCARD: /* silently discard */
932: m_freem(m);
933: return(-1);
934: case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
935: ip6stat.ip6s_badoptions++;
936: icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
937: return(-1);
938: case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
939: ip6stat.ip6s_badoptions++;
940: ip6 = mtod(m, struct ip6_hdr *);
941: if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
942: (m->m_flags & (M_BCAST|M_MCAST)))
943: m_freem(m);
944: else
945: icmp6_error(m, ICMP6_PARAM_PROB,
946: ICMP6_PARAMPROB_OPTION, off);
947: return(-1);
948: }
949:
950: m_freem(m); /* XXX: NOTREACHED */
951: return(-1);
952: }
953:
954: /*
1.9 itojun 955: * Create the "control" list for this pcb.
956: *
957: * The routine will be called from upper layer handlers like tcp6_input().
958: * Thus the routine assumes that the caller (tcp6_input) have already
959: * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
960: * very first mbuf on the mbuf chain.
961: * We may want to add some infinite loop prevention or sanity checks for safety.
962: * (This applies only when you are using KAME mbuf chain restriction, i.e.
963: * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2 itojun 964: */
965: void
966: ip6_savecontrol(in6p, mp, ip6, m)
967: register struct in6pcb *in6p;
968: register struct mbuf **mp;
969: register struct ip6_hdr *ip6;
970: register struct mbuf *m;
971: {
972: struct proc *p = curproc; /* XXX */
1.9 itojun 973: int privileged;
1.2 itojun 974:
1.9 itojun 975: privileged = 0;
976: if (p && !suser(p->p_ucred, &p->p_acflag))
977: privileged++;
978:
979: #ifdef SO_TIMESTAMP
1.2 itojun 980: if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
981: struct timeval tv;
982:
983: microtime(&tv);
984: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
985: SCM_TIMESTAMP, SOL_SOCKET);
986: if (*mp)
987: mp = &(*mp)->m_next;
988: }
1.9 itojun 989: #endif
1.2 itojun 990: if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
991: *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
992: sizeof(struct in6_addr), IPV6_RECVDSTADDR,
993: IPPROTO_IPV6);
994: if (*mp)
995: mp = &(*mp)->m_next;
996: }
997:
998: #ifdef noyet
999: /* options were tossed above */
1000: if (in6p->in6p_flags & IN6P_RECVOPTS)
1001: /* broken */
1002: /* ip6_srcroute doesn't do what we want here, need to fix */
1003: if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
1004: /* broken */
1005: #endif
1006:
1007: /* RFC 2292 sec. 5 */
1008: if (in6p->in6p_flags & IN6P_PKTINFO) {
1009: struct in6_pktinfo pi6;
1010: bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1011: if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1012: pi6.ipi6_addr.s6_addr16[1] = 0;
1013: pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1014: ? m->m_pkthdr.rcvif->if_index
1015: : 0;
1016: *mp = sbcreatecontrol((caddr_t) &pi6,
1017: sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1018: IPPROTO_IPV6);
1019: if (*mp)
1020: mp = &(*mp)->m_next;
1021: }
1022: if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1023: int hlim = ip6->ip6_hlim & 0xff;
1024: *mp = sbcreatecontrol((caddr_t) &hlim,
1025: sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1026: if (*mp)
1027: mp = &(*mp)->m_next;
1028: }
1029: /* IN6P_NEXTHOP - for outgoing packet only */
1030:
1031: /*
1032: * IPV6_HOPOPTS socket option. We require super-user privilege
1033: * for the option, but it might be too strict, since there might
1034: * be some hop-by-hop options which can be returned to normal user.
1035: * See RFC 2292 section 6.
1036: */
1.9 itojun 1037: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1038: /*
1039: * Check if a hop-by-hop options header is contatined in the
1040: * received packet, and if so, store the options as ancillary
1041: * data. Note that a hop-by-hop options header must be
1042: * just after the IPv6 header, which fact is assured through
1043: * the IPv6 input processing.
1044: */
1045: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1046: if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9 itojun 1047: struct ip6_hbh *hbh;
1048: int hbhlen;
1049:
1050: #ifndef PULLDOWN_TEST
1051: hbh = (struct ip6_hbh *)(ip6 + 1);
1052: hbhlen = (hbh->ip6h_len + 1) << 3;
1053: #else
1054: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1055: sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1056: if (hbh == NULL) {
1057: ip6stat.ip6s_tooshort++;
1058: return;
1059: }
1060: hbhlen = (hbh->ip6h_len + 1) << 3;
1061: IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1062: sizeof(struct ip6_hdr), hbhlen);
1063: if (hbh == NULL) {
1064: ip6stat.ip6s_tooshort++;
1065: return;
1066: }
1067: #endif
1.2 itojun 1068:
1069: /*
1070: * XXX: We copy whole the header even if a jumbo
1071: * payload option is included, which option is to
1072: * be removed before returning in the RFC 2292.
1073: * But it's too painful operation...
1074: */
1.9 itojun 1075: *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2 itojun 1076: IPV6_HOPOPTS, IPPROTO_IPV6);
1077: if (*mp)
1078: mp = &(*mp)->m_next;
1079: }
1080: }
1081:
1082: /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1083: if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1084: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1085: int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
1086:
1087: /*
1088: * Search for destination options headers or routing
1089: * header(s) through the header chain, and stores each
1090: * header as ancillary data.
1091: * Note that the order of the headers remains in
1092: * the chain of ancillary data.
1093: */
1094: while(1) { /* is explicit loop prevention necessary? */
1.9 itojun 1095: struct ip6_ext *ip6e;
1096: int elen;
1097:
1098: #ifndef PULLDOWN_TEST
1099: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1100: if (nxt == IPPROTO_AH)
1101: elen = (ip6e->ip6e_len + 2) << 2;
1102: else
1103: elen = (ip6e->ip6e_len + 1) << 3;
1104: #else
1105: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
1106: sizeof(struct ip6_ext));
1107: if (ip6e == NULL) {
1108: ip6stat.ip6s_tooshort++;
1109: return;
1110: }
1111: if (nxt == IPPROTO_AH)
1112: elen = (ip6e->ip6e_len + 2) << 2;
1113: else
1114: elen = (ip6e->ip6e_len + 1) << 3;
1115: IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
1116: if (ip6e == NULL) {
1117: ip6stat.ip6s_tooshort++;
1118: return;
1119: }
1120: #endif
1.2 itojun 1121:
1122: switch(nxt) {
1123: case IPPROTO_DSTOPTS:
1124: if (!in6p->in6p_flags & IN6P_DSTOPTS)
1125: break;
1126:
1127: /*
1128: * We also require super-user privilege for
1129: * the option.
1130: * See the comments on IN6_HOPOPTS.
1131: */
1.9 itojun 1132: if (!privileged)
1.2 itojun 1133: break;
1134:
1.9 itojun 1135: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1136: IPV6_DSTOPTS,
1137: IPPROTO_IPV6);
1138: if (*mp)
1139: mp = &(*mp)->m_next;
1140: break;
1141:
1142: case IPPROTO_ROUTING:
1143: if (!in6p->in6p_flags & IN6P_RTHDR)
1144: break;
1145:
1.9 itojun 1146: *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2 itojun 1147: IPV6_RTHDR,
1148: IPPROTO_IPV6);
1149: if (*mp)
1150: mp = &(*mp)->m_next;
1151: break;
1152:
1153: case IPPROTO_UDP:
1154: case IPPROTO_TCP:
1155: case IPPROTO_ICMPV6:
1156: default:
1157: /*
1158: * stop search if we encounter an upper
1159: * layer protocol headers.
1160: */
1161: goto loopend;
1162:
1163: case IPPROTO_HOPOPTS:
1164: case IPPROTO_AH: /* is it possible? */
1165: break;
1166: }
1167:
1168: /* proceed with the next header. */
1.9 itojun 1169: off += elen;
1.2 itojun 1170: nxt = ip6e->ip6e_nxt;
1171: }
1172: loopend:
1173: }
1.9 itojun 1174: if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2 itojun 1175: /* to be done */
1176: }
1.9 itojun 1177: if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2 itojun 1178: /* to be done */
1179: }
1180: /* IN6P_RTHDR - to be done */
1181:
1182: }
1183:
1184: /*
1185: * Get pointer to the previous header followed by the header
1186: * currently processed.
1187: * XXX: This function supposes that
1188: * M includes all headers,
1189: * the next header field and the header length field of each header
1190: * are valid, and
1191: * the sum of each header length equals to OFF.
1192: * Because of these assumptions, this function must be called very
1193: * carefully. Moreover, it will not be used in the near future when
1194: * we develop `neater' mechanism to process extension headers.
1195: */
1196: char *
1197: ip6_get_prevhdr(m, off)
1198: struct mbuf *m;
1199: int off;
1200: {
1201: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1202:
1203: if (off == sizeof(struct ip6_hdr))
1204: return(&ip6->ip6_nxt);
1205: else {
1206: int len, nxt;
1207: struct ip6_ext *ip6e = NULL;
1208:
1209: nxt = ip6->ip6_nxt;
1210: len = sizeof(struct ip6_hdr);
1211: while (len < off) {
1212: ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1213:
1214: switch(nxt) {
1215: case IPPROTO_FRAGMENT:
1216: len += sizeof(struct ip6_frag);
1217: break;
1218: case IPPROTO_AH:
1219: len += (ip6e->ip6e_len + 2) << 2;
1220: break;
1221: default:
1222: len += (ip6e->ip6e_len + 1) << 3;
1223: break;
1224: }
1225: nxt = ip6e->ip6e_nxt;
1226: }
1227: if (ip6e)
1228: return(&ip6e->ip6e_nxt);
1229: else
1230: return NULL;
1.18 itojun 1231: }
1232: }
1233:
1234: /*
1235: * get next header offset. m will be retained.
1236: */
1237: int
1238: ip6_nexthdr(m, off, proto, nxtp)
1239: struct mbuf *m;
1240: int off;
1241: int proto;
1242: int *nxtp;
1243: {
1244: struct ip6_hdr ip6;
1245: struct ip6_ext ip6e;
1246: struct ip6_frag fh;
1247:
1248: /* just in case */
1249: if (m == NULL)
1250: panic("ip6_nexthdr: m == NULL");
1251: if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1252: return -1;
1253:
1254: switch (proto) {
1255: case IPPROTO_IPV6:
1256: if (m->m_pkthdr.len < off + sizeof(ip6))
1257: return -1;
1258: m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1259: if (nxtp)
1260: *nxtp = ip6.ip6_nxt;
1261: off += sizeof(ip6);
1262: return off;
1263:
1264: case IPPROTO_FRAGMENT:
1265: /*
1266: * terminate parsing if it is not the first fragment,
1267: * it does not make sense to parse through it.
1268: */
1269: if (m->m_pkthdr.len < off + sizeof(fh))
1270: return -1;
1271: m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1272: if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1273: return -1;
1274: if (nxtp)
1275: *nxtp = fh.ip6f_nxt;
1276: off += sizeof(struct ip6_frag);
1277: return off;
1278:
1279: case IPPROTO_AH:
1280: if (m->m_pkthdr.len < off + sizeof(ip6e))
1281: return -1;
1282: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1283: if (nxtp)
1284: *nxtp = ip6e.ip6e_nxt;
1285: off += (ip6e.ip6e_len + 2) << 2;
1286: return off;
1287:
1288: case IPPROTO_HOPOPTS:
1289: case IPPROTO_ROUTING:
1290: case IPPROTO_DSTOPTS:
1291: if (m->m_pkthdr.len < off + sizeof(ip6e))
1292: return -1;
1293: m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1294: if (nxtp)
1295: *nxtp = ip6e.ip6e_nxt;
1296: off += (ip6e.ip6e_len + 1) << 3;
1297: return off;
1298:
1299: case IPPROTO_NONE:
1300: case IPPROTO_ESP:
1301: case IPPROTO_IPCOMP:
1302: /* give up */
1303: return -1;
1304:
1305: default:
1306: return -1;
1307: }
1308:
1309: return -1;
1310: }
1311:
1312: /*
1313: * get offset for the last header in the chain. m will be kept untainted.
1314: */
1315: int
1316: ip6_lasthdr(m, off, proto, nxtp)
1317: struct mbuf *m;
1318: int off;
1319: int proto;
1320: int *nxtp;
1321: {
1322: int newoff;
1323: int nxt;
1324:
1325: if (!nxtp) {
1326: nxt = -1;
1327: nxtp = &nxt;
1328: }
1329: while (1) {
1330: newoff = ip6_nexthdr(m, off, proto, nxtp);
1331: if (newoff < 0)
1332: return off;
1333: else if (newoff < off)
1334: return -1; /* invalid */
1335: else if (newoff == off)
1336: return newoff;
1337:
1338: off = newoff;
1339: proto = *nxtp;
1.2 itojun 1340: }
1341: }
1342:
1343: /*
1344: * System control for IP6
1345: */
1346:
1347: u_char inet6ctlerrmap[PRC_NCMDS] = {
1348: 0, 0, 0, 0,
1349: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1350: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1351: EMSGSIZE, EHOSTUNREACH, 0, 0,
1352: 0, 0, 0, 0,
1353: ENOPROTOOPT
1354: };
1355:
1.23 mrg 1356: #include <uvm/uvm_extern.h>
1.2 itojun 1357: #include <sys/sysctl.h>
1358:
1359: int
1360: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1361: int *name;
1362: u_int namelen;
1363: void *oldp;
1364: size_t *oldlenp;
1365: void *newp;
1366: size_t newlen;
1367: {
1.26 ! itojun 1368: int old, error;
! 1369:
1.2 itojun 1370: /* All sysctl names at this level are terminal. */
1371: if (namelen != 1)
1372: return ENOTDIR;
1373:
1374: switch (name[0]) {
1375:
1376: case IPV6CTL_FORWARDING:
1377: return sysctl_int(oldp, oldlenp, newp, newlen,
1378: &ip6_forwarding);
1379: case IPV6CTL_SENDREDIRECTS:
1380: return sysctl_int(oldp, oldlenp, newp, newlen,
1381: &ip6_sendredirects);
1382: case IPV6CTL_DEFHLIM:
1383: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
1384: case IPV6CTL_MAXFRAGPACKETS:
1385: return sysctl_int(oldp, oldlenp, newp, newlen,
1386: &ip6_maxfragpackets);
1387: case IPV6CTL_ACCEPT_RTADV:
1388: return sysctl_int(oldp, oldlenp, newp, newlen,
1389: &ip6_accept_rtadv);
1390: case IPV6CTL_KEEPFAITH:
1391: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
1392: case IPV6CTL_LOG_INTERVAL:
1393: return sysctl_int(oldp, oldlenp, newp, newlen,
1394: &ip6_log_interval);
1395: case IPV6CTL_HDRNESTLIMIT:
1396: return sysctl_int(oldp, oldlenp, newp, newlen,
1397: &ip6_hdrnestlimit);
1398: case IPV6CTL_DAD_COUNT:
1399: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
1400: case IPV6CTL_AUTO_FLOWLABEL:
1401: return sysctl_int(oldp, oldlenp, newp, newlen,
1402: &ip6_auto_flowlabel);
1403: case IPV6CTL_DEFMCASTHLIM:
1404: return sysctl_int(oldp, oldlenp, newp, newlen,
1405: &ip6_defmcasthlim);
1406: case IPV6CTL_GIF_HLIM:
1407: return sysctl_int(oldp, oldlenp, newp, newlen,
1408: &ip6_gif_hlim);
1409: case IPV6CTL_KAME_VERSION:
1410: return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9 itojun 1411: case IPV6CTL_USE_DEPRECATED:
1412: return sysctl_int(oldp, oldlenp, newp, newlen,
1413: &ip6_use_deprecated);
1.10 itojun 1414: case IPV6CTL_RR_PRUNE:
1415: return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12 itojun 1416: #ifndef INET6_BINDV6ONLY
1.11 itojun 1417: case IPV6CTL_BINDV6ONLY:
1418: return sysctl_int(oldp, oldlenp, newp, newlen,
1419: &ip6_bindv6only);
1.26 ! itojun 1420: #endif
! 1421: case IPV6CTL_ANONPORTMIN:
! 1422: old = ip6_anonportmin;
! 1423: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1424: &ip6_anonportmin);
! 1425: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
! 1426: ip6_anonportmin > 65535
! 1427: #ifndef IPNOPRIVPORTS
! 1428: || ip6_anonportmin < IPV6PORT_RESERVED
! 1429: #endif
! 1430: ) {
! 1431: ip6_anonportmin = old;
! 1432: return (EINVAL);
! 1433: }
! 1434: return (error);
! 1435: case IPV6CTL_ANONPORTMAX:
! 1436: old = ip6_anonportmax;
! 1437: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1438: &ip6_anonportmax);
! 1439: if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
! 1440: ip6_anonportmax > 65535
! 1441: #ifndef IPNOPRIVPORTS
! 1442: || ip6_anonportmax < IPV6PORT_RESERVED
! 1443: #endif
! 1444: ) {
! 1445: ip6_anonportmax = old;
! 1446: return (EINVAL);
! 1447: }
! 1448: return (error);
! 1449: #ifndef IPNOPRIVPORTS
! 1450: case IPV6CTL_LOWPORTMIN:
! 1451: old = ip6_lowportmin;
! 1452: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1453: &ip6_lowportmin);
! 1454: if (ip6_lowportmin >= ip6_lowportmax ||
! 1455: ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
! 1456: ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
! 1457: ip6_lowportmin = old;
! 1458: return (EINVAL);
! 1459: }
! 1460: return (error);
! 1461: case IPV6CTL_LOWPORTMAX:
! 1462: old = ip6_lowportmax;
! 1463: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1464: &ip6_lowportmax);
! 1465: if (ip6_lowportmin >= ip6_lowportmax ||
! 1466: ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
! 1467: ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
! 1468: ip6_lowportmax = old;
! 1469: return (EINVAL);
! 1470: }
! 1471: return (error);
1.11 itojun 1472: #endif
1.2 itojun 1473: default:
1474: return EOPNOTSUPP;
1475: }
1476: /* NOTREACHED */
1477: }
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