Annotation of src/sys/netinet/ip_input.c, Revision 1.106
1.106 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.105 2000/03/03 13:07:42 itojun Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.55 scottr 103:
1.62 matt 104: #include "opt_gateway.h"
1.69 mrg 105: #include "opt_pfil_hooks.h"
1.91 thorpej 106: #include "opt_ipsec.h"
1.55 scottr 107: #include "opt_mrouting.h"
1.1 cgd 108:
1.5 mycroft 109: #include <sys/param.h>
110: #include <sys/systm.h>
111: #include <sys/malloc.h>
112: #include <sys/mbuf.h>
113: #include <sys/domain.h>
114: #include <sys/protosw.h>
115: #include <sys/socket.h>
1.44 thorpej 116: #include <sys/socketvar.h>
1.5 mycroft 117: #include <sys/errno.h>
118: #include <sys/time.h>
119: #include <sys/kernel.h>
1.28 christos 120: #include <sys/proc.h>
1.72 thorpej 121: #include <sys/pool.h>
1.28 christos 122:
123: #include <vm/vm.h>
124: #include <sys/sysctl.h>
1.1 cgd 125:
1.5 mycroft 126: #include <net/if.h>
1.44 thorpej 127: #include <net/if_dl.h>
1.5 mycroft 128: #include <net/route.h>
1.45 mrg 129: #include <net/pfil.h>
1.1 cgd 130:
1.5 mycroft 131: #include <netinet/in.h>
132: #include <netinet/in_systm.h>
133: #include <netinet/ip.h>
134: #include <netinet/in_pcb.h>
135: #include <netinet/in_var.h>
136: #include <netinet/ip_var.h>
137: #include <netinet/ip_icmp.h>
1.89 itojun 138: /* just for gif_ttl */
139: #include <netinet/in_gif.h>
140: #include "gif.h"
141:
142: #ifdef IPSEC
143: #include <netinet6/ipsec.h>
144: #include <netkey/key.h>
145: #include <netkey/key_debug.h>
146: #endif
1.44 thorpej 147:
1.1 cgd 148: #ifndef IPFORWARDING
149: #ifdef GATEWAY
150: #define IPFORWARDING 1 /* forward IP packets not for us */
151: #else /* GATEWAY */
152: #define IPFORWARDING 0 /* don't forward IP packets not for us */
153: #endif /* GATEWAY */
154: #endif /* IPFORWARDING */
155: #ifndef IPSENDREDIRECTS
156: #define IPSENDREDIRECTS 1
157: #endif
1.26 thorpej 158: #ifndef IPFORWSRCRT
1.47 cjs 159: #define IPFORWSRCRT 1 /* forward source-routed packets */
160: #endif
161: #ifndef IPALLOWSRCRT
1.48 mrg 162: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 163: #endif
1.53 kml 164: #ifndef IPMTUDISC
165: #define IPMTUDISC 0
166: #endif
1.60 kml 167: #ifndef IPMTUDISCTIMEOUT
1.61 kml 168: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 169: #endif
1.53 kml 170:
1.27 thorpej 171: /*
172: * Note: DIRECTED_BROADCAST is handled this way so that previous
173: * configuration using this option will Just Work.
174: */
175: #ifndef IPDIRECTEDBCAST
176: #ifdef DIRECTED_BROADCAST
177: #define IPDIRECTEDBCAST 1
178: #else
179: #define IPDIRECTEDBCAST 0
180: #endif /* DIRECTED_BROADCAST */
181: #endif /* IPDIRECTEDBCAST */
1.1 cgd 182: int ipforwarding = IPFORWARDING;
183: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 184: int ip_defttl = IPDEFTTL;
1.26 thorpej 185: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 186: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 187: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 188: int ip_mtudisc = IPMTUDISC;
1.60 kml 189: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 190: #ifdef DIAGNOSTIC
191: int ipprintfs = 0;
192: #endif
193:
1.60 kml 194: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
195:
1.1 cgd 196: extern struct domain inetdomain;
197: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 198: struct in_ifaddrhead in_ifaddr;
1.57 tls 199: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 200: struct ifqueue ipintrq;
1.63 matt 201: struct ipstat ipstat;
202: u_int16_t ip_id;
203: int ip_defttl;
1.75 thorpej 204:
1.63 matt 205: struct ipqhead ipq;
1.75 thorpej 206: int ipq_locked;
207:
208: static __inline int ipq_lock_try __P((void));
209: static __inline void ipq_unlock __P((void));
210:
211: static __inline int
212: ipq_lock_try()
213: {
214: int s;
215:
216: s = splimp();
217: if (ipq_locked) {
218: splx(s);
219: return (0);
220: }
221: ipq_locked = 1;
222: splx(s);
223: return (1);
224: }
225:
226: static __inline void
227: ipq_unlock()
228: {
229: int s;
230:
231: s = splimp();
232: ipq_locked = 0;
233: splx(s);
234: }
235:
236: #ifdef DIAGNOSTIC
237: #define IPQ_LOCK() \
238: do { \
239: if (ipq_lock_try() == 0) { \
240: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
241: panic("ipq_lock"); \
242: } \
243: } while (0)
244: #define IPQ_LOCK_CHECK() \
245: do { \
246: if (ipq_locked == 0) { \
247: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
248: panic("ipq lock check"); \
249: } \
250: } while (0)
251: #else
252: #define IPQ_LOCK() (void) ipq_lock_try()
253: #define IPQ_LOCK_CHECK() /* nothing */
254: #endif
255:
256: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 257:
1.72 thorpej 258: struct pool ipqent_pool;
259:
1.1 cgd 260: /*
261: * We need to save the IP options in case a protocol wants to respond
262: * to an incoming packet over the same route if the packet got here
263: * using IP source routing. This allows connection establishment and
264: * maintenance when the remote end is on a network that is not known
265: * to us.
266: */
267: int ip_nhops = 0;
268: static struct ip_srcrt {
269: struct in_addr dst; /* final destination */
270: char nop; /* one NOP to align */
271: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
272: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
273: } ip_srcrt;
274:
1.13 mycroft 275: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 276:
1.1 cgd 277: /*
278: * IP initialization: fill in IP protocol switch table.
279: * All protocols not implemented in kernel go to raw IP protocol handler.
280: */
1.8 mycroft 281: void
1.1 cgd 282: ip_init()
283: {
284: register struct protosw *pr;
285: register int i;
286:
1.72 thorpej 287: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
288: 0, NULL, NULL, M_IPQ);
289:
1.1 cgd 290: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
291: if (pr == 0)
292: panic("ip_init");
293: for (i = 0; i < IPPROTO_MAX; i++)
294: ip_protox[i] = pr - inetsw;
295: for (pr = inetdomain.dom_protosw;
296: pr < inetdomain.dom_protoswNPROTOSW; pr++)
297: if (pr->pr_domain->dom_family == PF_INET &&
298: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
299: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 300: LIST_INIT(&ipq);
1.1 cgd 301: ip_id = time.tv_sec & 0xffff;
302: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 303: TAILQ_INIT(&in_ifaddr);
1.57 tls 304: in_ifaddrhashtbl =
305: hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60 kml 306: if (ip_mtudisc != 0)
307: ip_mtudisc_timeout_q =
308: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 309: #ifdef GATEWAY
310: ipflow_init();
311: #endif
1.1 cgd 312: }
313:
314: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
315: struct route ipforward_rt;
316:
317: /*
1.89 itojun 318: * IP software interrupt routine
319: */
320: void
321: ipintr()
322: {
323: int s;
324: struct mbuf *m;
325:
326: while (1) {
327: s = splimp();
328: IF_DEQUEUE(&ipintrq, m);
329: splx(s);
330: if (m == 0)
331: return;
332: ip_input(m);
333: }
334: }
335:
336: /*
1.1 cgd 337: * Ip input routine. Checksum and byte swap header. If fragmented
338: * try to reassemble. Process options. Pass to next level.
339: */
1.8 mycroft 340: void
1.89 itojun 341: ip_input(struct mbuf *m)
1.1 cgd 342: {
1.33 mrg 343: register struct ip *ip = NULL;
1.1 cgd 344: register struct ipq *fp;
345: register struct in_ifaddr *ia;
1.57 tls 346: register struct ifaddr *ifa;
1.25 cgd 347: struct ipqent *ipqe;
1.89 itojun 348: int hlen = 0, mff, len;
1.100 itojun 349: int downmatch;
1.36 mrg 350: #ifdef PFIL_HOOKS
1.33 mrg 351: struct packet_filter_hook *pfh;
352: struct mbuf *m0;
1.43 mrg 353: int rv;
1.36 mrg 354: #endif /* PFIL_HOOKS */
1.1 cgd 355:
356: #ifdef DIAGNOSTIC
357: if ((m->m_flags & M_PKTHDR) == 0)
358: panic("ipintr no HDR");
359: #endif
1.89 itojun 360: #ifdef IPSEC
361: /*
362: * should the inner packet be considered authentic?
363: * see comment in ah4_input().
364: */
365: if (m) {
366: m->m_flags &= ~M_AUTHIPHDR;
367: m->m_flags &= ~M_AUTHIPDGM;
368: }
369: #endif
1.1 cgd 370: /*
371: * If no IP addresses have been set yet but the interfaces
372: * are receiving, can't do anything with incoming packets yet.
373: */
1.22 mycroft 374: if (in_ifaddr.tqh_first == 0)
1.1 cgd 375: goto bad;
376: ipstat.ips_total++;
377: if (m->m_len < sizeof (struct ip) &&
378: (m = m_pullup(m, sizeof (struct ip))) == 0) {
379: ipstat.ips_toosmall++;
1.89 itojun 380: return;
1.1 cgd 381: }
382: ip = mtod(m, struct ip *);
1.13 mycroft 383: if (ip->ip_v != IPVERSION) {
384: ipstat.ips_badvers++;
385: goto bad;
386: }
1.1 cgd 387: hlen = ip->ip_hl << 2;
388: if (hlen < sizeof(struct ip)) { /* minimum header length */
389: ipstat.ips_badhlen++;
390: goto bad;
391: }
392: if (hlen > m->m_len) {
393: if ((m = m_pullup(m, hlen)) == 0) {
394: ipstat.ips_badhlen++;
1.89 itojun 395: return;
1.1 cgd 396: }
397: ip = mtod(m, struct ip *);
398: }
1.98 thorpej 399:
1.85 hwr 400: /*
1.99 thorpej 401: * RFC1122: packets with a multicast source address are
1.98 thorpej 402: * not allowed.
1.85 hwr 403: */
404: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 405: /* XXX stat */
1.85 hwr 406: goto bad;
407: }
408:
1.78 mycroft 409: if (in_cksum(m, hlen) != 0) {
1.1 cgd 410: ipstat.ips_badsum++;
411: goto bad;
412: }
413:
414: /*
415: * Convert fields to host representation.
416: */
417: NTOHS(ip->ip_len);
418: NTOHS(ip->ip_off);
1.35 mycroft 419: len = ip->ip_len;
1.81 proff 420:
421: /*
422: * Check for additional length bogosity
423: */
1.84 proff 424: if (len < hlen) {
1.81 proff 425: ipstat.ips_badlen++;
426: goto bad;
427: }
1.1 cgd 428:
429: /*
430: * Check that the amount of data in the buffers
431: * is as at least much as the IP header would have us expect.
432: * Trim mbufs if longer than we expect.
433: * Drop packet if shorter than we expect.
434: */
1.35 mycroft 435: if (m->m_pkthdr.len < len) {
1.1 cgd 436: ipstat.ips_tooshort++;
437: goto bad;
438: }
1.35 mycroft 439: if (m->m_pkthdr.len > len) {
1.1 cgd 440: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 441: m->m_len = len;
442: m->m_pkthdr.len = len;
1.1 cgd 443: } else
1.35 mycroft 444: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 445: }
446:
1.94 itojun 447: #ifdef IPSEC
448: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
449: m->m_flags &= ~M_CANFASTFWD;
450: #else
1.64 thorpej 451: /*
452: * Assume that we can create a fast-forward IP flow entry
453: * based on this packet.
454: */
455: m->m_flags |= M_CANFASTFWD;
1.94 itojun 456: #endif
1.64 thorpej 457:
1.36 mrg 458: #ifdef PFIL_HOOKS
1.33 mrg 459: /*
1.64 thorpej 460: * Run through list of hooks for input packets. If there are any
461: * filters which require that additional packets in the flow are
462: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
463: * Note that filters must _never_ set this flag, as another filter
464: * in the list may have previously cleared it.
1.33 mrg 465: */
466: m0 = m;
1.102 darrenr 467: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 468: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 469: if (pfh->pfil_func) {
1.101 darrenr 470: rv = pfh->pfil_func(ip, hlen,
471: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 472: if (rv)
1.89 itojun 473: return;
1.68 sommerfe 474: m = m0;
475: if (m == NULL)
1.89 itojun 476: return;
1.68 sommerfe 477: ip = mtod(m, struct ip *);
1.33 mrg 478: }
1.36 mrg 479: #endif /* PFIL_HOOKS */
1.33 mrg 480:
1.1 cgd 481: /*
482: * Process options and, if not destined for us,
483: * ship it on. ip_dooptions returns 1 when an
484: * error was detected (causing an icmp message
485: * to be sent and the original packet to be freed).
486: */
487: ip_nhops = 0; /* for source routed packets */
488: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 489: return;
1.1 cgd 490:
491: /*
492: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 493: *
494: * Traditional 4.4BSD did not consult IFF_UP at all.
495: * The behavior here is to treat addresses on !IFF_UP interface
496: * as not mine.
1.1 cgd 497: */
1.100 itojun 498: downmatch = 0;
1.97 itojun 499: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
500: ia != NULL;
501: ia = ia->ia_hash.le_next) {
502: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
503: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
504: break;
1.100 itojun 505: else
506: downmatch++;
1.97 itojun 507: }
508: }
1.86 thorpej 509: if (ia != NULL)
510: goto ours;
1.57 tls 511: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
512: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
513: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
514: if (ifa->ifa_addr->sa_family != AF_INET) continue;
515: ia = ifatoia(ifa);
1.35 mycroft 516: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
517: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 518: /*
519: * Look for all-0's host part (old broadcast addr),
520: * either for subnet or net.
521: */
522: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 523: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 524: goto ours;
1.57 tls 525: /*
526: * An interface with IP address zero accepts
527: * all packets that arrive on that interface.
528: */
529: if (in_nullhost(ia->ia_addr.sin_addr))
530: goto ours;
1.1 cgd 531: }
532: }
1.18 mycroft 533: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 534: struct in_multi *inm;
535: #ifdef MROUTING
536: extern struct socket *ip_mrouter;
1.10 brezak 537:
538: if (m->m_flags & M_EXT) {
539: if ((m = m_pullup(m, hlen)) == 0) {
540: ipstat.ips_toosmall++;
1.89 itojun 541: return;
1.10 brezak 542: }
543: ip = mtod(m, struct ip *);
544: }
1.4 hpeyerl 545:
546: if (ip_mrouter) {
547: /*
548: * If we are acting as a multicast router, all
549: * incoming multicast packets are passed to the
550: * kernel-level multicast forwarding function.
551: * The packet is returned (relatively) intact; if
552: * ip_mforward() returns a non-zero value, the packet
553: * must be discarded, else it may be accepted below.
554: *
555: * (The IP ident field is put in the same byte order
556: * as expected when ip_mforward() is called from
557: * ip_output().)
558: */
1.13 mycroft 559: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
560: ipstat.ips_cantforward++;
1.4 hpeyerl 561: m_freem(m);
1.89 itojun 562: return;
1.4 hpeyerl 563: }
564:
565: /*
566: * The process-level routing demon needs to receive
567: * all multicast IGMP packets, whether or not this
568: * host belongs to their destination groups.
569: */
570: if (ip->ip_p == IPPROTO_IGMP)
571: goto ours;
1.13 mycroft 572: ipstat.ips_forward++;
1.4 hpeyerl 573: }
574: #endif
575: /*
576: * See if we belong to the destination multicast group on the
577: * arrival interface.
578: */
579: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
580: if (inm == NULL) {
1.13 mycroft 581: ipstat.ips_cantforward++;
1.4 hpeyerl 582: m_freem(m);
1.89 itojun 583: return;
1.4 hpeyerl 584: }
585: goto ours;
586: }
1.19 mycroft 587: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 588: in_nullhost(ip->ip_dst))
1.1 cgd 589: goto ours;
590:
591: /*
592: * Not for us; forward if possible and desirable.
593: */
594: if (ipforwarding == 0) {
595: ipstat.ips_cantforward++;
596: m_freem(m);
1.100 itojun 597: } else {
598: /*
599: * If ip_dst matched any of my address on !IFF_UP interface,
600: * and there's no IFF_UP interface that matches ip_dst,
601: * send icmp unreach. Forwarding it will result in in-kernel
602: * forwarding loop till TTL goes to 0.
603: */
604: if (downmatch) {
605: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
606: ipstat.ips_cantforward++;
607: return;
608: }
1.1 cgd 609: ip_forward(m, 0);
1.100 itojun 610: }
1.89 itojun 611: return;
1.1 cgd 612:
613: ours:
614: /*
615: * If offset or IP_MF are set, must reassemble.
616: * Otherwise, nothing need be done.
617: * (We could look in the reassembly queue to see
618: * if the packet was previously fragmented,
619: * but it's not worth the time; just let them time out.)
620: */
1.37 perry 621: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 622: /*
623: * Look for queue of fragments
624: * of this datagram.
625: */
1.75 thorpej 626: IPQ_LOCK();
1.25 cgd 627: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 628: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 629: in_hosteq(ip->ip_src, fp->ipq_src) &&
630: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 631: ip->ip_p == fp->ipq_p)
632: goto found;
633: fp = 0;
634: found:
635:
636: /*
637: * Adjust ip_len to not reflect header,
1.25 cgd 638: * set ipqe_mff if more fragments are expected,
1.1 cgd 639: * convert offset of this to bytes.
640: */
641: ip->ip_len -= hlen;
1.25 cgd 642: mff = (ip->ip_off & IP_MF) != 0;
643: if (mff) {
1.16 cgd 644: /*
645: * Make sure that fragments have a data length
646: * that's a non-zero multiple of 8 bytes.
647: */
1.17 cgd 648: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 649: ipstat.ips_badfrags++;
1.75 thorpej 650: IPQ_UNLOCK();
1.16 cgd 651: goto bad;
652: }
653: }
1.1 cgd 654: ip->ip_off <<= 3;
655:
656: /*
657: * If datagram marked as having more fragments
658: * or if this is not the first fragment,
659: * attempt reassembly; if it succeeds, proceed.
660: */
1.25 cgd 661: if (mff || ip->ip_off) {
1.1 cgd 662: ipstat.ips_fragments++;
1.72 thorpej 663: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 664: if (ipqe == NULL) {
665: ipstat.ips_rcvmemdrop++;
1.75 thorpej 666: IPQ_UNLOCK();
1.25 cgd 667: goto bad;
668: }
669: ipqe->ipqe_mff = mff;
1.50 thorpej 670: ipqe->ipqe_m = m;
1.25 cgd 671: ipqe->ipqe_ip = ip;
1.50 thorpej 672: m = ip_reass(ipqe, fp);
1.75 thorpej 673: if (m == 0) {
674: IPQ_UNLOCK();
1.89 itojun 675: return;
1.75 thorpej 676: }
1.13 mycroft 677: ipstat.ips_reassembled++;
1.50 thorpej 678: ip = mtod(m, struct ip *);
1.74 thorpej 679: hlen = ip->ip_hl << 2;
1.79 mycroft 680: ip->ip_len += hlen;
1.1 cgd 681: } else
682: if (fp)
683: ip_freef(fp);
1.75 thorpej 684: IPQ_UNLOCK();
1.79 mycroft 685: }
1.1 cgd 686:
687: /*
688: * Switch out to protocol's input routine.
689: */
1.82 aidan 690: #if IFA_STATS
691: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
692: #endif
1.1 cgd 693: ipstat.ips_delivered++;
1.89 itojun 694: {
695: int off = hlen, nh = ip->ip_p;
696:
697: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
698: return;
699: }
1.1 cgd 700: bad:
701: m_freem(m);
702: }
703:
704: /*
705: * Take incoming datagram fragment and try to
706: * reassemble it into whole datagram. If a chain for
707: * reassembly of this datagram already exists, then it
708: * is given as fp; otherwise have to make a chain.
709: */
1.50 thorpej 710: struct mbuf *
1.25 cgd 711: ip_reass(ipqe, fp)
712: register struct ipqent *ipqe;
1.1 cgd 713: register struct ipq *fp;
714: {
1.50 thorpej 715: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 716: register struct ipqent *nq, *p, *q;
717: struct ip *ip;
1.1 cgd 718: struct mbuf *t;
1.25 cgd 719: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 720: int i, next;
721:
1.75 thorpej 722: IPQ_LOCK_CHECK();
723:
1.1 cgd 724: /*
725: * Presence of header sizes in mbufs
726: * would confuse code below.
727: */
728: m->m_data += hlen;
729: m->m_len -= hlen;
730:
731: /*
732: * If first fragment to arrive, create a reassembly queue.
733: */
734: if (fp == 0) {
1.50 thorpej 735: MALLOC(fp, struct ipq *, sizeof (struct ipq),
736: M_FTABLE, M_NOWAIT);
737: if (fp == NULL)
1.1 cgd 738: goto dropfrag;
1.25 cgd 739: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 740: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 741: fp->ipq_p = ipqe->ipqe_ip->ip_p;
742: fp->ipq_id = ipqe->ipqe_ip->ip_id;
743: LIST_INIT(&fp->ipq_fragq);
744: fp->ipq_src = ipqe->ipqe_ip->ip_src;
745: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
746: p = NULL;
1.1 cgd 747: goto insert;
748: }
749:
750: /*
751: * Find a segment which begins after this one does.
752: */
1.25 cgd 753: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
754: p = q, q = q->ipqe_q.le_next)
755: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 756: break;
757:
758: /*
759: * If there is a preceding segment, it may provide some of
760: * our data already. If so, drop the data from the incoming
761: * segment. If it provides all of our data, drop us.
762: */
1.25 cgd 763: if (p != NULL) {
764: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
765: ipqe->ipqe_ip->ip_off;
1.1 cgd 766: if (i > 0) {
1.25 cgd 767: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 768: goto dropfrag;
1.50 thorpej 769: m_adj(ipqe->ipqe_m, i);
1.25 cgd 770: ipqe->ipqe_ip->ip_off += i;
771: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 772: }
773: }
774:
775: /*
776: * While we overlap succeeding segments trim them or,
777: * if they are completely covered, dequeue them.
778: */
1.25 cgd 779: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
780: q->ipqe_ip->ip_off; q = nq) {
781: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
782: q->ipqe_ip->ip_off;
783: if (i < q->ipqe_ip->ip_len) {
784: q->ipqe_ip->ip_len -= i;
785: q->ipqe_ip->ip_off += i;
1.50 thorpej 786: m_adj(q->ipqe_m, i);
1.1 cgd 787: break;
788: }
1.25 cgd 789: nq = q->ipqe_q.le_next;
1.50 thorpej 790: m_freem(q->ipqe_m);
1.25 cgd 791: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 792: pool_put(&ipqent_pool, q);
1.1 cgd 793: }
794:
795: insert:
796: /*
797: * Stick new segment in its place;
798: * check for complete reassembly.
799: */
1.25 cgd 800: if (p == NULL) {
801: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
802: } else {
803: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
804: }
1.1 cgd 805: next = 0;
1.25 cgd 806: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
807: p = q, q = q->ipqe_q.le_next) {
808: if (q->ipqe_ip->ip_off != next)
1.1 cgd 809: return (0);
1.25 cgd 810: next += q->ipqe_ip->ip_len;
1.1 cgd 811: }
1.25 cgd 812: if (p->ipqe_mff)
1.1 cgd 813: return (0);
814:
815: /*
1.41 thorpej 816: * Reassembly is complete. Check for a bogus message size and
817: * concatenate fragments.
1.1 cgd 818: */
1.25 cgd 819: q = fp->ipq_fragq.lh_first;
820: ip = q->ipqe_ip;
1.41 thorpej 821: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
822: ipstat.ips_toolong++;
823: ip_freef(fp);
824: return (0);
825: }
1.50 thorpej 826: m = q->ipqe_m;
1.1 cgd 827: t = m->m_next;
828: m->m_next = 0;
829: m_cat(m, t);
1.25 cgd 830: nq = q->ipqe_q.le_next;
1.72 thorpej 831: pool_put(&ipqent_pool, q);
1.25 cgd 832: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 833: t = q->ipqe_m;
1.25 cgd 834: nq = q->ipqe_q.le_next;
1.72 thorpej 835: pool_put(&ipqent_pool, q);
1.1 cgd 836: m_cat(m, t);
837: }
838:
839: /*
840: * Create header for new ip packet by
841: * modifying header of first packet;
842: * dequeue and discard fragment reassembly header.
843: * Make header visible.
844: */
845: ip->ip_len = next;
1.25 cgd 846: ip->ip_src = fp->ipq_src;
847: ip->ip_dst = fp->ipq_dst;
848: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 849: FREE(fp, M_FTABLE);
1.1 cgd 850: m->m_len += (ip->ip_hl << 2);
851: m->m_data -= (ip->ip_hl << 2);
852: /* some debugging cruft by sklower, below, will go away soon */
853: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
854: register int plen = 0;
1.50 thorpej 855: for (t = m; t; t = t->m_next)
856: plen += t->m_len;
857: m->m_pkthdr.len = plen;
1.1 cgd 858: }
1.50 thorpej 859: return (m);
1.1 cgd 860:
861: dropfrag:
862: ipstat.ips_fragdropped++;
863: m_freem(m);
1.72 thorpej 864: pool_put(&ipqent_pool, ipqe);
1.1 cgd 865: return (0);
866: }
867:
868: /*
869: * Free a fragment reassembly header and all
870: * associated datagrams.
871: */
1.8 mycroft 872: void
1.1 cgd 873: ip_freef(fp)
874: struct ipq *fp;
875: {
1.25 cgd 876: register struct ipqent *q, *p;
1.1 cgd 877:
1.75 thorpej 878: IPQ_LOCK_CHECK();
879:
1.25 cgd 880: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
881: p = q->ipqe_q.le_next;
1.50 thorpej 882: m_freem(q->ipqe_m);
1.25 cgd 883: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 884: pool_put(&ipqent_pool, q);
1.1 cgd 885: }
1.25 cgd 886: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 887: FREE(fp, M_FTABLE);
1.1 cgd 888: }
889:
890: /*
891: * IP timer processing;
892: * if a timer expires on a reassembly
893: * queue, discard it.
894: */
1.8 mycroft 895: void
1.1 cgd 896: ip_slowtimo()
897: {
1.25 cgd 898: register struct ipq *fp, *nfp;
1.24 mycroft 899: int s = splsoftnet();
1.1 cgd 900:
1.75 thorpej 901: IPQ_LOCK();
1.25 cgd 902: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
903: nfp = fp->ipq_q.le_next;
904: if (--fp->ipq_ttl == 0) {
1.1 cgd 905: ipstat.ips_fragtimeout++;
1.25 cgd 906: ip_freef(fp);
1.1 cgd 907: }
908: }
1.75 thorpej 909: IPQ_UNLOCK();
1.63 matt 910: #ifdef GATEWAY
911: ipflow_slowtimo();
912: #endif
1.1 cgd 913: splx(s);
914: }
915:
916: /*
917: * Drain off all datagram fragments.
918: */
1.8 mycroft 919: void
1.1 cgd 920: ip_drain()
921: {
922:
1.75 thorpej 923: /*
924: * We may be called from a device's interrupt context. If
925: * the ipq is already busy, just bail out now.
926: */
927: if (ipq_lock_try() == 0)
928: return;
929:
1.25 cgd 930: while (ipq.lh_first != NULL) {
1.1 cgd 931: ipstat.ips_fragdropped++;
1.25 cgd 932: ip_freef(ipq.lh_first);
1.1 cgd 933: }
1.75 thorpej 934:
935: IPQ_UNLOCK();
1.1 cgd 936: }
937:
938: /*
939: * Do option processing on a datagram,
940: * possibly discarding it if bad options are encountered,
941: * or forwarding it if source-routed.
942: * Returns 1 if packet has been forwarded/freed,
943: * 0 if the packet should be processed further.
944: */
1.8 mycroft 945: int
1.1 cgd 946: ip_dooptions(m)
947: struct mbuf *m;
948: {
949: register struct ip *ip = mtod(m, struct ip *);
1.104 thorpej 950: register u_char *cp, *cp0;
1.1 cgd 951: register struct ip_timestamp *ipt;
952: register struct in_ifaddr *ia;
953: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 954: struct in_addr dst;
1.1 cgd 955: n_time ntime;
956:
1.13 mycroft 957: dst = ip->ip_dst;
1.1 cgd 958: cp = (u_char *)(ip + 1);
959: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
960: for (; cnt > 0; cnt -= optlen, cp += optlen) {
961: opt = cp[IPOPT_OPTVAL];
962: if (opt == IPOPT_EOL)
963: break;
964: if (opt == IPOPT_NOP)
965: optlen = 1;
966: else {
967: optlen = cp[IPOPT_OLEN];
968: if (optlen <= 0 || optlen > cnt) {
969: code = &cp[IPOPT_OLEN] - (u_char *)ip;
970: goto bad;
971: }
972: }
973: switch (opt) {
974:
975: default:
976: break;
977:
978: /*
979: * Source routing with record.
980: * Find interface with current destination address.
981: * If none on this machine then drop if strictly routed,
982: * or do nothing if loosely routed.
983: * Record interface address and bring up next address
984: * component. If strictly routed make sure next
985: * address is on directly accessible net.
986: */
987: case IPOPT_LSRR:
988: case IPOPT_SSRR:
1.47 cjs 989: if (ip_allowsrcrt == 0) {
990: type = ICMP_UNREACH;
991: code = ICMP_UNREACH_NET_PROHIB;
992: goto bad;
993: }
1.1 cgd 994: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
995: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
996: goto bad;
997: }
998: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 999: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1000: if (ia == 0) {
1001: if (opt == IPOPT_SSRR) {
1002: type = ICMP_UNREACH;
1003: code = ICMP_UNREACH_SRCFAIL;
1004: goto bad;
1005: }
1006: /*
1007: * Loose routing, and not at next destination
1008: * yet; nothing to do except forward.
1009: */
1010: break;
1011: }
1012: off--; /* 0 origin */
1013: if (off > optlen - sizeof(struct in_addr)) {
1014: /*
1015: * End of source route. Should be for us.
1016: */
1017: save_rte(cp, ip->ip_src);
1018: break;
1019: }
1020: /*
1021: * locate outgoing interface
1022: */
1023: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1024: sizeof(ipaddr.sin_addr));
1.96 thorpej 1025: if (opt == IPOPT_SSRR)
1026: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1027: else
1.1 cgd 1028: ia = ip_rtaddr(ipaddr.sin_addr);
1029: if (ia == 0) {
1030: type = ICMP_UNREACH;
1031: code = ICMP_UNREACH_SRCFAIL;
1032: goto bad;
1033: }
1034: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1035: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1036: (caddr_t)(cp + off), sizeof(struct in_addr));
1037: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1038: /*
1039: * Let ip_intr's mcast routing check handle mcast pkts
1040: */
1.18 mycroft 1041: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1042: break;
1043:
1044: case IPOPT_RR:
1045: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1046: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1047: goto bad;
1048: }
1049: /*
1050: * If no space remains, ignore.
1051: */
1052: off--; /* 0 origin */
1053: if (off > optlen - sizeof(struct in_addr))
1054: break;
1055: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1056: sizeof(ipaddr.sin_addr));
1057: /*
1058: * locate outgoing interface; if we're the destination,
1059: * use the incoming interface (should be same).
1060: */
1.96 thorpej 1061: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1062: == NULL &&
1063: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1064: type = ICMP_UNREACH;
1065: code = ICMP_UNREACH_HOST;
1066: goto bad;
1067: }
1.20 mycroft 1068: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1069: (caddr_t)(cp + off), sizeof(struct in_addr));
1070: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1071: break;
1072:
1073: case IPOPT_TS:
1074: code = cp - (u_char *)ip;
1075: ipt = (struct ip_timestamp *)cp;
1076: if (ipt->ipt_len < 5)
1077: goto bad;
1.15 cgd 1078: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 1079: if (++ipt->ipt_oflw == 0)
1080: goto bad;
1081: break;
1082: }
1.104 thorpej 1083: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1084: switch (ipt->ipt_flg) {
1085:
1086: case IPOPT_TS_TSONLY:
1087: break;
1088:
1089: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1090: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1 cgd 1091: sizeof(struct in_addr) > ipt->ipt_len)
1092: goto bad;
1.13 mycroft 1093: ipaddr.sin_addr = dst;
1.96 thorpej 1094: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1095: m->m_pkthdr.rcvif));
1.13 mycroft 1096: if (ia == 0)
1097: continue;
1.104 thorpej 1098: bcopy(&ia->ia_addr.sin_addr,
1099: cp0, sizeof(struct in_addr));
1.1 cgd 1100: ipt->ipt_ptr += sizeof(struct in_addr);
1101: break;
1102:
1103: case IPOPT_TS_PRESPEC:
1.66 thorpej 1104: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1 cgd 1105: sizeof(struct in_addr) > ipt->ipt_len)
1106: goto bad;
1.104 thorpej 1107: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1108: sizeof(struct in_addr));
1.96 thorpej 1109: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1110: == NULL)
1.1 cgd 1111: continue;
1112: ipt->ipt_ptr += sizeof(struct in_addr);
1113: break;
1114:
1115: default:
1116: goto bad;
1117: }
1118: ntime = iptime();
1.106 ! thorpej 1119: bcopy(&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1120: sizeof(n_time));
1121: ipt->ipt_ptr += sizeof(n_time);
1122: }
1123: }
1124: if (forward) {
1.26 thorpej 1125: if (ip_forwsrcrt == 0) {
1126: type = ICMP_UNREACH;
1127: code = ICMP_UNREACH_SRCFAIL;
1128: goto bad;
1129: }
1.1 cgd 1130: ip_forward(m, 1);
1131: return (1);
1.13 mycroft 1132: }
1133: return (0);
1.1 cgd 1134: bad:
1.13 mycroft 1135: icmp_error(m, type, code, 0, 0);
1136: ipstat.ips_badoptions++;
1.1 cgd 1137: return (1);
1138: }
1139:
1140: /*
1141: * Given address of next destination (final or next hop),
1142: * return internet address info of interface to be used to get there.
1143: */
1144: struct in_ifaddr *
1145: ip_rtaddr(dst)
1146: struct in_addr dst;
1147: {
1148: register struct sockaddr_in *sin;
1149:
1.19 mycroft 1150: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1151:
1.35 mycroft 1152: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1153: if (ipforward_rt.ro_rt) {
1154: RTFREE(ipforward_rt.ro_rt);
1155: ipforward_rt.ro_rt = 0;
1156: }
1157: sin->sin_family = AF_INET;
1158: sin->sin_len = sizeof(*sin);
1159: sin->sin_addr = dst;
1160:
1161: rtalloc(&ipforward_rt);
1162: }
1163: if (ipforward_rt.ro_rt == 0)
1164: return ((struct in_ifaddr *)0);
1.19 mycroft 1165: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1166: }
1167:
1168: /*
1169: * Save incoming source route for use in replies,
1170: * to be picked up later by ip_srcroute if the receiver is interested.
1171: */
1.13 mycroft 1172: void
1.1 cgd 1173: save_rte(option, dst)
1174: u_char *option;
1175: struct in_addr dst;
1176: {
1177: unsigned olen;
1178:
1179: olen = option[IPOPT_OLEN];
1180: #ifdef DIAGNOSTIC
1181: if (ipprintfs)
1.39 christos 1182: printf("save_rte: olen %d\n", olen);
1.89 itojun 1183: #endif /* 0 */
1.1 cgd 1184: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1185: return;
1186: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1187: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1188: ip_srcrt.dst = dst;
1189: }
1190:
1191: /*
1192: * Retrieve incoming source route for use in replies,
1193: * in the same form used by setsockopt.
1194: * The first hop is placed before the options, will be removed later.
1195: */
1196: struct mbuf *
1197: ip_srcroute()
1198: {
1199: register struct in_addr *p, *q;
1200: register struct mbuf *m;
1201:
1202: if (ip_nhops == 0)
1203: return ((struct mbuf *)0);
1204: m = m_get(M_DONTWAIT, MT_SOOPTS);
1205: if (m == 0)
1206: return ((struct mbuf *)0);
1207:
1.13 mycroft 1208: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1209:
1210: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1211: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1212: OPTSIZ;
1213: #ifdef DIAGNOSTIC
1214: if (ipprintfs)
1.39 christos 1215: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1216: #endif
1217:
1218: /*
1219: * First save first hop for return route
1220: */
1221: p = &ip_srcrt.route[ip_nhops - 1];
1222: *(mtod(m, struct in_addr *)) = *p--;
1223: #ifdef DIAGNOSTIC
1224: if (ipprintfs)
1.39 christos 1225: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1226: #endif
1227:
1228: /*
1229: * Copy option fields and padding (nop) to mbuf.
1230: */
1231: ip_srcrt.nop = IPOPT_NOP;
1232: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1233: bcopy((caddr_t)&ip_srcrt.nop,
1234: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1235: q = (struct in_addr *)(mtod(m, caddr_t) +
1236: sizeof(struct in_addr) + OPTSIZ);
1237: #undef OPTSIZ
1238: /*
1239: * Record return path as an IP source route,
1240: * reversing the path (pointers are now aligned).
1241: */
1242: while (p >= ip_srcrt.route) {
1243: #ifdef DIAGNOSTIC
1244: if (ipprintfs)
1.39 christos 1245: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1246: #endif
1247: *q++ = *p--;
1248: }
1249: /*
1250: * Last hop goes to final destination.
1251: */
1252: *q = ip_srcrt.dst;
1253: #ifdef DIAGNOSTIC
1254: if (ipprintfs)
1.39 christos 1255: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1256: #endif
1257: return (m);
1258: }
1259:
1260: /*
1261: * Strip out IP options, at higher
1262: * level protocol in the kernel.
1263: * Second argument is buffer to which options
1264: * will be moved, and return value is their length.
1265: * XXX should be deleted; last arg currently ignored.
1266: */
1.8 mycroft 1267: void
1.1 cgd 1268: ip_stripoptions(m, mopt)
1269: register struct mbuf *m;
1270: struct mbuf *mopt;
1271: {
1272: register int i;
1273: struct ip *ip = mtod(m, struct ip *);
1274: register caddr_t opts;
1275: int olen;
1276:
1.79 mycroft 1277: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1278: opts = (caddr_t)(ip + 1);
1279: i = m->m_len - (sizeof (struct ip) + olen);
1280: bcopy(opts + olen, opts, (unsigned)i);
1281: m->m_len -= olen;
1282: if (m->m_flags & M_PKTHDR)
1283: m->m_pkthdr.len -= olen;
1.79 mycroft 1284: ip->ip_len -= olen;
1285: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1286: }
1287:
1.23 mycroft 1288: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1289: 0, 0, 0, 0,
1290: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1291: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1292: EMSGSIZE, EHOSTUNREACH, 0, 0,
1293: 0, 0, 0, 0,
1294: ENOPROTOOPT
1295: };
1296:
1297: /*
1298: * Forward a packet. If some error occurs return the sender
1299: * an icmp packet. Note we can't always generate a meaningful
1300: * icmp message because icmp doesn't have a large enough repertoire
1301: * of codes and types.
1302: *
1303: * If not forwarding, just drop the packet. This could be confusing
1304: * if ipforwarding was zero but some routing protocol was advancing
1305: * us as a gateway to somewhere. However, we must let the routing
1306: * protocol deal with that.
1307: *
1308: * The srcrt parameter indicates whether the packet is being forwarded
1309: * via a source route.
1310: */
1.13 mycroft 1311: void
1.1 cgd 1312: ip_forward(m, srcrt)
1313: struct mbuf *m;
1314: int srcrt;
1315: {
1316: register struct ip *ip = mtod(m, struct ip *);
1317: register struct sockaddr_in *sin;
1318: register struct rtentry *rt;
1.28 christos 1319: int error, type = 0, code = 0;
1.1 cgd 1320: struct mbuf *mcopy;
1.13 mycroft 1321: n_long dest;
1322: struct ifnet *destifp;
1.89 itojun 1323: #ifdef IPSEC
1324: struct ifnet dummyifp;
1325: #endif
1.1 cgd 1326:
1.13 mycroft 1327: dest = 0;
1.1 cgd 1328: #ifdef DIAGNOSTIC
1329: if (ipprintfs)
1.70 thorpej 1330: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1331: ntohl(ip->ip_src.s_addr),
1332: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1333: #endif
1.93 sommerfe 1334: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1335: ipstat.ips_cantforward++;
1336: m_freem(m);
1337: return;
1338: }
1339: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1340: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1341: return;
1342: }
1343: ip->ip_ttl -= IPTTLDEC;
1344:
1.19 mycroft 1345: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1346: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1347: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1348: if (ipforward_rt.ro_rt) {
1349: RTFREE(ipforward_rt.ro_rt);
1350: ipforward_rt.ro_rt = 0;
1351: }
1352: sin->sin_family = AF_INET;
1.35 mycroft 1353: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1354: sin->sin_addr = ip->ip_dst;
1355:
1356: rtalloc(&ipforward_rt);
1357: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1358: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1359: return;
1360: }
1361: rt = ipforward_rt.ro_rt;
1362: }
1363:
1364: /*
1.34 mycroft 1365: * Save at most 68 bytes of the packet in case
1.1 cgd 1366: * we need to generate an ICMP message to the src.
1367: */
1.34 mycroft 1368: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1369:
1370: /*
1371: * If forwarding packet using same interface that it came in on,
1372: * perhaps should send a redirect to sender to shortcut a hop.
1373: * Only send redirect if source is sending directly to us,
1374: * and if packet was not source routed (or has any options).
1375: * Also, don't send redirect if forwarding using a default route
1376: * or a route modified by a redirect.
1377: */
1378: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1379: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1380: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1381: ipsendredirects && !srcrt) {
1.19 mycroft 1382: if (rt->rt_ifa &&
1383: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1384: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1385: if (rt->rt_flags & RTF_GATEWAY)
1386: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1387: else
1388: dest = ip->ip_dst.s_addr;
1389: /*
1390: * Router requirements says to only send host
1391: * redirects.
1392: */
1393: type = ICMP_REDIRECT;
1394: code = ICMP_REDIRECT_HOST;
1.1 cgd 1395: #ifdef DIAGNOSTIC
1.77 thorpej 1396: if (ipprintfs)
1397: printf("redirect (%d) to %x\n", code,
1398: (u_int32_t)dest);
1.1 cgd 1399: #endif
1400: }
1401: }
1402:
1.89 itojun 1403: #ifdef IPSEC
1.103 itojun 1404: /* Don't lookup socket in forwading case */
1405: ipsec_setsocket(m, NULL);
1406: #endif
1.27 thorpej 1407: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1408: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1409: if (error)
1410: ipstat.ips_cantforward++;
1411: else {
1412: ipstat.ips_forward++;
1413: if (type)
1414: ipstat.ips_redirectsent++;
1415: else {
1.63 matt 1416: if (mcopy) {
1417: #ifdef GATEWAY
1.64 thorpej 1418: if (mcopy->m_flags & M_CANFASTFWD)
1419: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1420: #endif
1.1 cgd 1421: m_freem(mcopy);
1.63 matt 1422: }
1.1 cgd 1423: return;
1424: }
1425: }
1426: if (mcopy == NULL)
1427: return;
1.13 mycroft 1428: destifp = NULL;
1429:
1.1 cgd 1430: switch (error) {
1431:
1432: case 0: /* forwarded, but need redirect */
1433: /* type, code set above */
1434: break;
1435:
1436: case ENETUNREACH: /* shouldn't happen, checked above */
1437: case EHOSTUNREACH:
1438: case ENETDOWN:
1439: case EHOSTDOWN:
1440: default:
1441: type = ICMP_UNREACH;
1442: code = ICMP_UNREACH_HOST;
1443: break;
1444:
1445: case EMSGSIZE:
1446: type = ICMP_UNREACH;
1447: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1448: #ifndef IPSEC
1.13 mycroft 1449: if (ipforward_rt.ro_rt)
1450: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1451: #else
1452: /*
1453: * If the packet is routed over IPsec tunnel, tell the
1454: * originator the tunnel MTU.
1455: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1456: * XXX quickhack!!!
1457: */
1458: if (ipforward_rt.ro_rt) {
1459: struct secpolicy *sp;
1460: int ipsecerror;
1.95 itojun 1461: size_t ipsechdr;
1.89 itojun 1462: struct route *ro;
1463:
1464: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1465: IPSEC_DIR_OUTBOUND,
1466: IP_FORWARDING,
1467: &ipsecerror);
1.89 itojun 1468:
1469: if (sp == NULL)
1470: destifp = ipforward_rt.ro_rt->rt_ifp;
1471: else {
1472: /* count IPsec header size */
1.95 itojun 1473: ipsechdr = ipsec4_hdrsiz(mcopy,
1474: IPSEC_DIR_OUTBOUND,
1475: NULL);
1.89 itojun 1476:
1477: /*
1478: * find the correct route for outer IPv4
1479: * header, compute tunnel MTU.
1480: *
1481: * XXX BUG ALERT
1482: * The "dummyifp" code relies upon the fact
1483: * that icmp_error() touches only ifp->if_mtu.
1484: */
1485: /*XXX*/
1486: destifp = NULL;
1487: if (sp->req != NULL
1.95 itojun 1488: && sp->req->sav != NULL
1489: && sp->req->sav->sah != NULL) {
1490: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1491: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1492: dummyifp.if_mtu =
1493: ro->ro_rt->rt_ifp->if_mtu;
1494: dummyifp.if_mtu -= ipsechdr;
1495: destifp = &dummyifp;
1496: }
1497: }
1498:
1499: key_freesp(sp);
1500: }
1501: }
1502: #endif /*IPSEC*/
1.1 cgd 1503: ipstat.ips_cantfrag++;
1504: break;
1505:
1506: case ENOBUFS:
1507: type = ICMP_SOURCEQUENCH;
1508: code = 0;
1509: break;
1510: }
1.13 mycroft 1511: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1512: }
1513:
1514: void
1515: ip_savecontrol(inp, mp, ip, m)
1516: register struct inpcb *inp;
1517: register struct mbuf **mp;
1518: register struct ip *ip;
1519: register struct mbuf *m;
1520: {
1521:
1522: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1523: struct timeval tv;
1524:
1525: microtime(&tv);
1526: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1527: SCM_TIMESTAMP, SOL_SOCKET);
1528: if (*mp)
1529: mp = &(*mp)->m_next;
1530: }
1531: if (inp->inp_flags & INP_RECVDSTADDR) {
1532: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1533: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1534: if (*mp)
1535: mp = &(*mp)->m_next;
1536: }
1537: #ifdef notyet
1538: /*
1539: * XXX
1540: * Moving these out of udp_input() made them even more broken
1541: * than they already were.
1542: * - fenner@parc.xerox.com
1543: */
1544: /* options were tossed already */
1545: if (inp->inp_flags & INP_RECVOPTS) {
1546: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1547: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1548: if (*mp)
1549: mp = &(*mp)->m_next;
1550: }
1551: /* ip_srcroute doesn't do what we want here, need to fix */
1552: if (inp->inp_flags & INP_RECVRETOPTS) {
1553: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1554: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1555: if (*mp)
1556: mp = &(*mp)->m_next;
1557: }
1558: #endif
1559: if (inp->inp_flags & INP_RECVIF) {
1560: struct sockaddr_dl sdl;
1561:
1562: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1563: sdl.sdl_family = AF_LINK;
1564: sdl.sdl_index = m->m_pkthdr.rcvif ?
1565: m->m_pkthdr.rcvif->if_index : 0;
1566: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1567: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1568: IP_RECVIF, IPPROTO_IP);
1569: if (*mp)
1570: mp = &(*mp)->m_next;
1571: }
1.13 mycroft 1572: }
1573:
1574: int
1575: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1576: int *name;
1577: u_int namelen;
1578: void *oldp;
1579: size_t *oldlenp;
1580: void *newp;
1581: size_t newlen;
1582: {
1.88 sommerfe 1583: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1584:
1.54 lukem 1585: int error, old;
1586:
1.13 mycroft 1587: /* All sysctl names at this level are terminal. */
1588: if (namelen != 1)
1589: return (ENOTDIR);
1590:
1591: switch (name[0]) {
1592: case IPCTL_FORWARDING:
1593: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1594: case IPCTL_SENDREDIRECTS:
1595: return (sysctl_int(oldp, oldlenp, newp, newlen,
1596: &ipsendredirects));
1597: case IPCTL_DEFTTL:
1598: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1599: #ifdef notyet
1600: case IPCTL_DEFMTU:
1601: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1602: #endif
1.26 thorpej 1603: case IPCTL_FORWSRCRT:
1.47 cjs 1604: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1605: if (securelevel > 0)
1.46 cjs 1606: return (sysctl_rdint(oldp, oldlenp, newp,
1607: ip_forwsrcrt));
1608: else
1609: return (sysctl_int(oldp, oldlenp, newp, newlen,
1610: &ip_forwsrcrt));
1.27 thorpej 1611: case IPCTL_DIRECTEDBCAST:
1612: return (sysctl_int(oldp, oldlenp, newp, newlen,
1613: &ip_directedbcast));
1.47 cjs 1614: case IPCTL_ALLOWSRCRT:
1615: return (sysctl_int(oldp, oldlenp, newp, newlen,
1616: &ip_allowsrcrt));
1.52 thorpej 1617: case IPCTL_SUBNETSARELOCAL:
1618: return (sysctl_int(oldp, oldlenp, newp, newlen,
1619: &subnetsarelocal));
1.53 kml 1620: case IPCTL_MTUDISC:
1.60 kml 1621: error = sysctl_int(oldp, oldlenp, newp, newlen,
1622: &ip_mtudisc);
1623: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1624: ip_mtudisc_timeout_q =
1625: rt_timer_queue_create(ip_mtudisc_timeout);
1626: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1627: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1628: ip_mtudisc_timeout_q = NULL;
1629: }
1630: return error;
1.54 lukem 1631: case IPCTL_ANONPORTMIN:
1632: old = anonportmin;
1633: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1634: if (anonportmin >= anonportmax || anonportmin > 65535
1635: #ifndef IPNOPRIVPORTS
1636: || anonportmin < IPPORT_RESERVED
1637: #endif
1638: ) {
1639: anonportmin = old;
1640: return (EINVAL);
1641: }
1642: return (error);
1643: case IPCTL_ANONPORTMAX:
1644: old = anonportmax;
1645: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1646: if (anonportmin >= anonportmax || anonportmax > 65535
1647: #ifndef IPNOPRIVPORTS
1648: || anonportmax < IPPORT_RESERVED
1649: #endif
1650: ) {
1651: anonportmax = old;
1652: return (EINVAL);
1653: }
1.60 kml 1654: return (error);
1655: case IPCTL_MTUDISCTIMEOUT:
1656: error = sysctl_int(oldp, oldlenp, newp, newlen,
1657: &ip_mtudisc_timeout);
1658: if (ip_mtudisc_timeout_q != NULL)
1659: rt_timer_queue_change(ip_mtudisc_timeout_q,
1660: ip_mtudisc_timeout);
1.54 lukem 1661: return (error);
1.65 matt 1662: #ifdef GATEWAY
1663: case IPCTL_MAXFLOWS:
1.67 thorpej 1664: {
1665: int s;
1666:
1.65 matt 1667: error = sysctl_int(oldp, oldlenp, newp, newlen,
1668: &ip_maxflows);
1.67 thorpej 1669: s = splsoftnet();
1.65 matt 1670: ipflow_reap(0);
1.67 thorpej 1671: splx(s);
1.65 matt 1672: return (error);
1.67 thorpej 1673: }
1.89 itojun 1674: #endif
1.90 itojun 1675: case IPCTL_HOSTZEROBROADCAST:
1676: return (sysctl_int(oldp, oldlenp, newp, newlen,
1677: &hostzeroisbroadcast));
1.89 itojun 1678: #if NGIF > 0
1679: case IPCTL_GIF_TTL:
1680: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1681: &ip_gif_ttl));
1.65 matt 1682: #endif
1.88 sommerfe 1683:
1.13 mycroft 1684: default:
1685: return (EOPNOTSUPP);
1686: }
1687: /* NOTREACHED */
1.1 cgd 1688: }
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