Annotation of src/sys/netinet/ip_input.c, Revision 1.101
1.101 ! darrenr 1: /* $NetBSD: ip_input.c,v 1.100 2000/02/16 12:40:40 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;
1.101 ! darrenr 467: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]]);
! 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;
1.89 itojun 846: ip->ip_ttl = 0; /* xxx */
847: ip->ip_sum = 0;
1.25 cgd 848: ip->ip_src = fp->ipq_src;
849: ip->ip_dst = fp->ipq_dst;
850: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 851: FREE(fp, M_FTABLE);
1.1 cgd 852: m->m_len += (ip->ip_hl << 2);
853: m->m_data -= (ip->ip_hl << 2);
854: /* some debugging cruft by sklower, below, will go away soon */
855: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
856: register int plen = 0;
1.50 thorpej 857: for (t = m; t; t = t->m_next)
858: plen += t->m_len;
859: m->m_pkthdr.len = plen;
1.1 cgd 860: }
1.50 thorpej 861: return (m);
1.1 cgd 862:
863: dropfrag:
864: ipstat.ips_fragdropped++;
865: m_freem(m);
1.72 thorpej 866: pool_put(&ipqent_pool, ipqe);
1.1 cgd 867: return (0);
868: }
869:
870: /*
871: * Free a fragment reassembly header and all
872: * associated datagrams.
873: */
1.8 mycroft 874: void
1.1 cgd 875: ip_freef(fp)
876: struct ipq *fp;
877: {
1.25 cgd 878: register struct ipqent *q, *p;
1.1 cgd 879:
1.75 thorpej 880: IPQ_LOCK_CHECK();
881:
1.25 cgd 882: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
883: p = q->ipqe_q.le_next;
1.50 thorpej 884: m_freem(q->ipqe_m);
1.25 cgd 885: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 886: pool_put(&ipqent_pool, q);
1.1 cgd 887: }
1.25 cgd 888: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 889: FREE(fp, M_FTABLE);
1.1 cgd 890: }
891:
892: /*
893: * IP timer processing;
894: * if a timer expires on a reassembly
895: * queue, discard it.
896: */
1.8 mycroft 897: void
1.1 cgd 898: ip_slowtimo()
899: {
1.25 cgd 900: register struct ipq *fp, *nfp;
1.24 mycroft 901: int s = splsoftnet();
1.1 cgd 902:
1.75 thorpej 903: IPQ_LOCK();
1.25 cgd 904: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
905: nfp = fp->ipq_q.le_next;
906: if (--fp->ipq_ttl == 0) {
1.1 cgd 907: ipstat.ips_fragtimeout++;
1.25 cgd 908: ip_freef(fp);
1.1 cgd 909: }
910: }
1.75 thorpej 911: IPQ_UNLOCK();
1.63 matt 912: #ifdef GATEWAY
913: ipflow_slowtimo();
914: #endif
1.1 cgd 915: splx(s);
916: }
917:
918: /*
919: * Drain off all datagram fragments.
920: */
1.8 mycroft 921: void
1.1 cgd 922: ip_drain()
923: {
924:
1.75 thorpej 925: /*
926: * We may be called from a device's interrupt context. If
927: * the ipq is already busy, just bail out now.
928: */
929: if (ipq_lock_try() == 0)
930: return;
931:
1.25 cgd 932: while (ipq.lh_first != NULL) {
1.1 cgd 933: ipstat.ips_fragdropped++;
1.25 cgd 934: ip_freef(ipq.lh_first);
1.1 cgd 935: }
1.75 thorpej 936:
937: IPQ_UNLOCK();
1.1 cgd 938: }
939:
940: /*
941: * Do option processing on a datagram,
942: * possibly discarding it if bad options are encountered,
943: * or forwarding it if source-routed.
944: * Returns 1 if packet has been forwarded/freed,
945: * 0 if the packet should be processed further.
946: */
1.8 mycroft 947: int
1.1 cgd 948: ip_dooptions(m)
949: struct mbuf *m;
950: {
951: register struct ip *ip = mtod(m, struct ip *);
952: register u_char *cp;
953: register struct ip_timestamp *ipt;
954: register struct in_ifaddr *ia;
955: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 956: struct in_addr *sin, dst;
1.1 cgd 957: n_time ntime;
958:
1.13 mycroft 959: dst = ip->ip_dst;
1.1 cgd 960: cp = (u_char *)(ip + 1);
961: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
962: for (; cnt > 0; cnt -= optlen, cp += optlen) {
963: opt = cp[IPOPT_OPTVAL];
964: if (opt == IPOPT_EOL)
965: break;
966: if (opt == IPOPT_NOP)
967: optlen = 1;
968: else {
969: optlen = cp[IPOPT_OLEN];
970: if (optlen <= 0 || optlen > cnt) {
971: code = &cp[IPOPT_OLEN] - (u_char *)ip;
972: goto bad;
973: }
974: }
975: switch (opt) {
976:
977: default:
978: break;
979:
980: /*
981: * Source routing with record.
982: * Find interface with current destination address.
983: * If none on this machine then drop if strictly routed,
984: * or do nothing if loosely routed.
985: * Record interface address and bring up next address
986: * component. If strictly routed make sure next
987: * address is on directly accessible net.
988: */
989: case IPOPT_LSRR:
990: case IPOPT_SSRR:
1.47 cjs 991: if (ip_allowsrcrt == 0) {
992: type = ICMP_UNREACH;
993: code = ICMP_UNREACH_NET_PROHIB;
994: goto bad;
995: }
1.1 cgd 996: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
997: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
998: goto bad;
999: }
1000: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1001: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1002: if (ia == 0) {
1003: if (opt == IPOPT_SSRR) {
1004: type = ICMP_UNREACH;
1005: code = ICMP_UNREACH_SRCFAIL;
1006: goto bad;
1007: }
1008: /*
1009: * Loose routing, and not at next destination
1010: * yet; nothing to do except forward.
1011: */
1012: break;
1013: }
1014: off--; /* 0 origin */
1015: if (off > optlen - sizeof(struct in_addr)) {
1016: /*
1017: * End of source route. Should be for us.
1018: */
1019: save_rte(cp, ip->ip_src);
1020: break;
1021: }
1022: /*
1023: * locate outgoing interface
1024: */
1025: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1026: sizeof(ipaddr.sin_addr));
1.96 thorpej 1027: if (opt == IPOPT_SSRR)
1028: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1029: else
1.1 cgd 1030: ia = ip_rtaddr(ipaddr.sin_addr);
1031: if (ia == 0) {
1032: type = ICMP_UNREACH;
1033: code = ICMP_UNREACH_SRCFAIL;
1034: goto bad;
1035: }
1036: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1037: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1038: (caddr_t)(cp + off), sizeof(struct in_addr));
1039: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1040: /*
1041: * Let ip_intr's mcast routing check handle mcast pkts
1042: */
1.18 mycroft 1043: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1044: break;
1045:
1046: case IPOPT_RR:
1047: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1048: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1049: goto bad;
1050: }
1051: /*
1052: * If no space remains, ignore.
1053: */
1054: off--; /* 0 origin */
1055: if (off > optlen - sizeof(struct in_addr))
1056: break;
1057: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1058: sizeof(ipaddr.sin_addr));
1059: /*
1060: * locate outgoing interface; if we're the destination,
1061: * use the incoming interface (should be same).
1062: */
1.96 thorpej 1063: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1064: == NULL &&
1065: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1066: type = ICMP_UNREACH;
1067: code = ICMP_UNREACH_HOST;
1068: goto bad;
1069: }
1.20 mycroft 1070: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1071: (caddr_t)(cp + off), sizeof(struct in_addr));
1072: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1073: break;
1074:
1075: case IPOPT_TS:
1076: code = cp - (u_char *)ip;
1077: ipt = (struct ip_timestamp *)cp;
1078: if (ipt->ipt_len < 5)
1079: goto bad;
1.15 cgd 1080: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 1081: if (++ipt->ipt_oflw == 0)
1082: goto bad;
1083: break;
1084: }
1085: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
1086: switch (ipt->ipt_flg) {
1087:
1088: case IPOPT_TS_TSONLY:
1089: break;
1090:
1091: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1092: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1 cgd 1093: sizeof(struct in_addr) > ipt->ipt_len)
1094: goto bad;
1.13 mycroft 1095: ipaddr.sin_addr = dst;
1.96 thorpej 1096: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1097: m->m_pkthdr.rcvif));
1.13 mycroft 1098: if (ia == 0)
1099: continue;
1.20 mycroft 1100: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1101: (caddr_t)sin, sizeof(struct in_addr));
1102: ipt->ipt_ptr += sizeof(struct in_addr);
1103: break;
1104:
1105: case IPOPT_TS_PRESPEC:
1.66 thorpej 1106: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.1 cgd 1107: sizeof(struct in_addr) > ipt->ipt_len)
1108: goto bad;
1109: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
1110: sizeof(struct in_addr));
1.96 thorpej 1111: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1112: == NULL)
1.1 cgd 1113: continue;
1114: ipt->ipt_ptr += sizeof(struct in_addr);
1115: break;
1116:
1117: default:
1118: goto bad;
1119: }
1120: ntime = iptime();
1121: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
1122: sizeof(n_time));
1123: ipt->ipt_ptr += sizeof(n_time);
1124: }
1125: }
1126: if (forward) {
1.26 thorpej 1127: if (ip_forwsrcrt == 0) {
1128: type = ICMP_UNREACH;
1129: code = ICMP_UNREACH_SRCFAIL;
1130: goto bad;
1131: }
1.1 cgd 1132: ip_forward(m, 1);
1133: return (1);
1.13 mycroft 1134: }
1135: return (0);
1.1 cgd 1136: bad:
1.13 mycroft 1137: icmp_error(m, type, code, 0, 0);
1138: ipstat.ips_badoptions++;
1.1 cgd 1139: return (1);
1140: }
1141:
1142: /*
1143: * Given address of next destination (final or next hop),
1144: * return internet address info of interface to be used to get there.
1145: */
1146: struct in_ifaddr *
1147: ip_rtaddr(dst)
1148: struct in_addr dst;
1149: {
1150: register struct sockaddr_in *sin;
1151:
1.19 mycroft 1152: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1153:
1.35 mycroft 1154: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1155: if (ipforward_rt.ro_rt) {
1156: RTFREE(ipforward_rt.ro_rt);
1157: ipforward_rt.ro_rt = 0;
1158: }
1159: sin->sin_family = AF_INET;
1160: sin->sin_len = sizeof(*sin);
1161: sin->sin_addr = dst;
1162:
1163: rtalloc(&ipforward_rt);
1164: }
1165: if (ipforward_rt.ro_rt == 0)
1166: return ((struct in_ifaddr *)0);
1.19 mycroft 1167: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1168: }
1169:
1170: /*
1171: * Save incoming source route for use in replies,
1172: * to be picked up later by ip_srcroute if the receiver is interested.
1173: */
1.13 mycroft 1174: void
1.1 cgd 1175: save_rte(option, dst)
1176: u_char *option;
1177: struct in_addr dst;
1178: {
1179: unsigned olen;
1180:
1181: olen = option[IPOPT_OLEN];
1182: #ifdef DIAGNOSTIC
1183: if (ipprintfs)
1.39 christos 1184: printf("save_rte: olen %d\n", olen);
1.89 itojun 1185: #endif /* 0 */
1.1 cgd 1186: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1187: return;
1188: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1189: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1190: ip_srcrt.dst = dst;
1191: }
1192:
1193: /*
1194: * Retrieve incoming source route for use in replies,
1195: * in the same form used by setsockopt.
1196: * The first hop is placed before the options, will be removed later.
1197: */
1198: struct mbuf *
1199: ip_srcroute()
1200: {
1201: register struct in_addr *p, *q;
1202: register struct mbuf *m;
1203:
1204: if (ip_nhops == 0)
1205: return ((struct mbuf *)0);
1206: m = m_get(M_DONTWAIT, MT_SOOPTS);
1207: if (m == 0)
1208: return ((struct mbuf *)0);
1209:
1.13 mycroft 1210: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1211:
1212: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1213: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1214: OPTSIZ;
1215: #ifdef DIAGNOSTIC
1216: if (ipprintfs)
1.39 christos 1217: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1218: #endif
1219:
1220: /*
1221: * First save first hop for return route
1222: */
1223: p = &ip_srcrt.route[ip_nhops - 1];
1224: *(mtod(m, struct in_addr *)) = *p--;
1225: #ifdef DIAGNOSTIC
1226: if (ipprintfs)
1.39 christos 1227: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1228: #endif
1229:
1230: /*
1231: * Copy option fields and padding (nop) to mbuf.
1232: */
1233: ip_srcrt.nop = IPOPT_NOP;
1234: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1235: bcopy((caddr_t)&ip_srcrt.nop,
1236: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1237: q = (struct in_addr *)(mtod(m, caddr_t) +
1238: sizeof(struct in_addr) + OPTSIZ);
1239: #undef OPTSIZ
1240: /*
1241: * Record return path as an IP source route,
1242: * reversing the path (pointers are now aligned).
1243: */
1244: while (p >= ip_srcrt.route) {
1245: #ifdef DIAGNOSTIC
1246: if (ipprintfs)
1.39 christos 1247: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1248: #endif
1249: *q++ = *p--;
1250: }
1251: /*
1252: * Last hop goes to final destination.
1253: */
1254: *q = ip_srcrt.dst;
1255: #ifdef DIAGNOSTIC
1256: if (ipprintfs)
1.39 christos 1257: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1258: #endif
1259: return (m);
1260: }
1261:
1262: /*
1263: * Strip out IP options, at higher
1264: * level protocol in the kernel.
1265: * Second argument is buffer to which options
1266: * will be moved, and return value is their length.
1267: * XXX should be deleted; last arg currently ignored.
1268: */
1.8 mycroft 1269: void
1.1 cgd 1270: ip_stripoptions(m, mopt)
1271: register struct mbuf *m;
1272: struct mbuf *mopt;
1273: {
1274: register int i;
1275: struct ip *ip = mtod(m, struct ip *);
1276: register caddr_t opts;
1277: int olen;
1278:
1.79 mycroft 1279: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1280: opts = (caddr_t)(ip + 1);
1281: i = m->m_len - (sizeof (struct ip) + olen);
1282: bcopy(opts + olen, opts, (unsigned)i);
1283: m->m_len -= olen;
1284: if (m->m_flags & M_PKTHDR)
1285: m->m_pkthdr.len -= olen;
1.79 mycroft 1286: ip->ip_len -= olen;
1287: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1288: }
1289:
1.23 mycroft 1290: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1291: 0, 0, 0, 0,
1292: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1293: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1294: EMSGSIZE, EHOSTUNREACH, 0, 0,
1295: 0, 0, 0, 0,
1296: ENOPROTOOPT
1297: };
1298:
1299: /*
1300: * Forward a packet. If some error occurs return the sender
1301: * an icmp packet. Note we can't always generate a meaningful
1302: * icmp message because icmp doesn't have a large enough repertoire
1303: * of codes and types.
1304: *
1305: * If not forwarding, just drop the packet. This could be confusing
1306: * if ipforwarding was zero but some routing protocol was advancing
1307: * us as a gateway to somewhere. However, we must let the routing
1308: * protocol deal with that.
1309: *
1310: * The srcrt parameter indicates whether the packet is being forwarded
1311: * via a source route.
1312: */
1.13 mycroft 1313: void
1.1 cgd 1314: ip_forward(m, srcrt)
1315: struct mbuf *m;
1316: int srcrt;
1317: {
1318: register struct ip *ip = mtod(m, struct ip *);
1319: register struct sockaddr_in *sin;
1320: register struct rtentry *rt;
1.28 christos 1321: int error, type = 0, code = 0;
1.1 cgd 1322: struct mbuf *mcopy;
1.13 mycroft 1323: n_long dest;
1324: struct ifnet *destifp;
1.89 itojun 1325: #ifdef IPSEC
1326: struct ifnet dummyifp;
1327: #endif
1.1 cgd 1328:
1.13 mycroft 1329: dest = 0;
1.1 cgd 1330: #ifdef DIAGNOSTIC
1331: if (ipprintfs)
1.70 thorpej 1332: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1333: ntohl(ip->ip_src.s_addr),
1334: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1335: #endif
1.93 sommerfe 1336: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1337: ipstat.ips_cantforward++;
1338: m_freem(m);
1339: return;
1340: }
1341: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1342: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1343: return;
1344: }
1345: ip->ip_ttl -= IPTTLDEC;
1346:
1.19 mycroft 1347: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1348: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1349: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1350: if (ipforward_rt.ro_rt) {
1351: RTFREE(ipforward_rt.ro_rt);
1352: ipforward_rt.ro_rt = 0;
1353: }
1354: sin->sin_family = AF_INET;
1.35 mycroft 1355: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1356: sin->sin_addr = ip->ip_dst;
1357:
1358: rtalloc(&ipforward_rt);
1359: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1360: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1361: return;
1362: }
1363: rt = ipforward_rt.ro_rt;
1364: }
1365:
1366: /*
1.34 mycroft 1367: * Save at most 68 bytes of the packet in case
1.1 cgd 1368: * we need to generate an ICMP message to the src.
1369: */
1.34 mycroft 1370: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1371:
1372: /*
1373: * If forwarding packet using same interface that it came in on,
1374: * perhaps should send a redirect to sender to shortcut a hop.
1375: * Only send redirect if source is sending directly to us,
1376: * and if packet was not source routed (or has any options).
1377: * Also, don't send redirect if forwarding using a default route
1378: * or a route modified by a redirect.
1379: */
1380: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1381: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1382: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1383: ipsendredirects && !srcrt) {
1.19 mycroft 1384: if (rt->rt_ifa &&
1385: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1386: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1387: if (rt->rt_flags & RTF_GATEWAY)
1388: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1389: else
1390: dest = ip->ip_dst.s_addr;
1391: /*
1392: * Router requirements says to only send host
1393: * redirects.
1394: */
1395: type = ICMP_REDIRECT;
1396: code = ICMP_REDIRECT_HOST;
1.1 cgd 1397: #ifdef DIAGNOSTIC
1.77 thorpej 1398: if (ipprintfs)
1399: printf("redirect (%d) to %x\n", code,
1400: (u_int32_t)dest);
1.1 cgd 1401: #endif
1402: }
1403: }
1404:
1.89 itojun 1405: #ifdef IPSEC
1406: m->m_pkthdr.rcvif = NULL;
1407: #endif /*IPSEC*/
1.27 thorpej 1408: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1409: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1410: if (error)
1411: ipstat.ips_cantforward++;
1412: else {
1413: ipstat.ips_forward++;
1414: if (type)
1415: ipstat.ips_redirectsent++;
1416: else {
1.63 matt 1417: if (mcopy) {
1418: #ifdef GATEWAY
1.64 thorpej 1419: if (mcopy->m_flags & M_CANFASTFWD)
1420: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1421: #endif
1.1 cgd 1422: m_freem(mcopy);
1.63 matt 1423: }
1.1 cgd 1424: return;
1425: }
1426: }
1427: if (mcopy == NULL)
1428: return;
1.13 mycroft 1429: destifp = NULL;
1430:
1.1 cgd 1431: switch (error) {
1432:
1433: case 0: /* forwarded, but need redirect */
1434: /* type, code set above */
1435: break;
1436:
1437: case ENETUNREACH: /* shouldn't happen, checked above */
1438: case EHOSTUNREACH:
1439: case ENETDOWN:
1440: case EHOSTDOWN:
1441: default:
1442: type = ICMP_UNREACH;
1443: code = ICMP_UNREACH_HOST;
1444: break;
1445:
1446: case EMSGSIZE:
1447: type = ICMP_UNREACH;
1448: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1449: #ifndef IPSEC
1.13 mycroft 1450: if (ipforward_rt.ro_rt)
1451: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1452: #else
1453: /*
1454: * If the packet is routed over IPsec tunnel, tell the
1455: * originator the tunnel MTU.
1456: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1457: * XXX quickhack!!!
1458: */
1459: if (ipforward_rt.ro_rt) {
1460: struct secpolicy *sp;
1461: int ipsecerror;
1.95 itojun 1462: size_t ipsechdr;
1.89 itojun 1463: struct route *ro;
1464:
1465: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1466: IPSEC_DIR_OUTBOUND,
1467: IP_FORWARDING,
1468: &ipsecerror);
1.89 itojun 1469:
1470: if (sp == NULL)
1471: destifp = ipforward_rt.ro_rt->rt_ifp;
1472: else {
1473: /* count IPsec header size */
1.95 itojun 1474: ipsechdr = ipsec4_hdrsiz(mcopy,
1475: IPSEC_DIR_OUTBOUND,
1476: NULL);
1.89 itojun 1477:
1478: /*
1479: * find the correct route for outer IPv4
1480: * header, compute tunnel MTU.
1481: *
1482: * XXX BUG ALERT
1483: * The "dummyifp" code relies upon the fact
1484: * that icmp_error() touches only ifp->if_mtu.
1485: */
1486: /*XXX*/
1487: destifp = NULL;
1488: if (sp->req != NULL
1.95 itojun 1489: && sp->req->sav != NULL
1490: && sp->req->sav->sah != NULL) {
1491: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1492: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1493: dummyifp.if_mtu =
1494: ro->ro_rt->rt_ifp->if_mtu;
1495: dummyifp.if_mtu -= ipsechdr;
1496: destifp = &dummyifp;
1497: }
1498: }
1499:
1500: key_freesp(sp);
1501: }
1502: }
1503: #endif /*IPSEC*/
1.1 cgd 1504: ipstat.ips_cantfrag++;
1505: break;
1506:
1507: case ENOBUFS:
1508: type = ICMP_SOURCEQUENCH;
1509: code = 0;
1510: break;
1511: }
1.13 mycroft 1512: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1513: }
1514:
1515: void
1516: ip_savecontrol(inp, mp, ip, m)
1517: register struct inpcb *inp;
1518: register struct mbuf **mp;
1519: register struct ip *ip;
1520: register struct mbuf *m;
1521: {
1522:
1523: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1524: struct timeval tv;
1525:
1526: microtime(&tv);
1527: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1528: SCM_TIMESTAMP, SOL_SOCKET);
1529: if (*mp)
1530: mp = &(*mp)->m_next;
1531: }
1532: if (inp->inp_flags & INP_RECVDSTADDR) {
1533: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1534: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1535: if (*mp)
1536: mp = &(*mp)->m_next;
1537: }
1538: #ifdef notyet
1539: /*
1540: * XXX
1541: * Moving these out of udp_input() made them even more broken
1542: * than they already were.
1543: * - fenner@parc.xerox.com
1544: */
1545: /* options were tossed already */
1546: if (inp->inp_flags & INP_RECVOPTS) {
1547: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1548: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1549: if (*mp)
1550: mp = &(*mp)->m_next;
1551: }
1552: /* ip_srcroute doesn't do what we want here, need to fix */
1553: if (inp->inp_flags & INP_RECVRETOPTS) {
1554: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1555: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1556: if (*mp)
1557: mp = &(*mp)->m_next;
1558: }
1559: #endif
1560: if (inp->inp_flags & INP_RECVIF) {
1561: struct sockaddr_dl sdl;
1562:
1563: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1564: sdl.sdl_family = AF_LINK;
1565: sdl.sdl_index = m->m_pkthdr.rcvif ?
1566: m->m_pkthdr.rcvif->if_index : 0;
1567: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1568: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1569: IP_RECVIF, IPPROTO_IP);
1570: if (*mp)
1571: mp = &(*mp)->m_next;
1572: }
1.13 mycroft 1573: }
1574:
1575: int
1576: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1577: int *name;
1578: u_int namelen;
1579: void *oldp;
1580: size_t *oldlenp;
1581: void *newp;
1582: size_t newlen;
1583: {
1.88 sommerfe 1584: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1585:
1.54 lukem 1586: int error, old;
1587:
1.13 mycroft 1588: /* All sysctl names at this level are terminal. */
1589: if (namelen != 1)
1590: return (ENOTDIR);
1591:
1592: switch (name[0]) {
1593: case IPCTL_FORWARDING:
1594: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1595: case IPCTL_SENDREDIRECTS:
1596: return (sysctl_int(oldp, oldlenp, newp, newlen,
1597: &ipsendredirects));
1598: case IPCTL_DEFTTL:
1599: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1600: #ifdef notyet
1601: case IPCTL_DEFMTU:
1602: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1603: #endif
1.26 thorpej 1604: case IPCTL_FORWSRCRT:
1.47 cjs 1605: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1606: if (securelevel > 0)
1.46 cjs 1607: return (sysctl_rdint(oldp, oldlenp, newp,
1608: ip_forwsrcrt));
1609: else
1610: return (sysctl_int(oldp, oldlenp, newp, newlen,
1611: &ip_forwsrcrt));
1.27 thorpej 1612: case IPCTL_DIRECTEDBCAST:
1613: return (sysctl_int(oldp, oldlenp, newp, newlen,
1614: &ip_directedbcast));
1.47 cjs 1615: case IPCTL_ALLOWSRCRT:
1616: return (sysctl_int(oldp, oldlenp, newp, newlen,
1617: &ip_allowsrcrt));
1.52 thorpej 1618: case IPCTL_SUBNETSARELOCAL:
1619: return (sysctl_int(oldp, oldlenp, newp, newlen,
1620: &subnetsarelocal));
1.53 kml 1621: case IPCTL_MTUDISC:
1.60 kml 1622: error = sysctl_int(oldp, oldlenp, newp, newlen,
1623: &ip_mtudisc);
1624: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1625: ip_mtudisc_timeout_q =
1626: rt_timer_queue_create(ip_mtudisc_timeout);
1627: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1628: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1629: ip_mtudisc_timeout_q = NULL;
1630: }
1631: return error;
1.54 lukem 1632: case IPCTL_ANONPORTMIN:
1633: old = anonportmin;
1634: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1635: if (anonportmin >= anonportmax || anonportmin > 65535
1636: #ifndef IPNOPRIVPORTS
1637: || anonportmin < IPPORT_RESERVED
1638: #endif
1639: ) {
1640: anonportmin = old;
1641: return (EINVAL);
1642: }
1643: return (error);
1644: case IPCTL_ANONPORTMAX:
1645: old = anonportmax;
1646: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1647: if (anonportmin >= anonportmax || anonportmax > 65535
1648: #ifndef IPNOPRIVPORTS
1649: || anonportmax < IPPORT_RESERVED
1650: #endif
1651: ) {
1652: anonportmax = old;
1653: return (EINVAL);
1654: }
1.60 kml 1655: return (error);
1656: case IPCTL_MTUDISCTIMEOUT:
1657: error = sysctl_int(oldp, oldlenp, newp, newlen,
1658: &ip_mtudisc_timeout);
1659: if (ip_mtudisc_timeout_q != NULL)
1660: rt_timer_queue_change(ip_mtudisc_timeout_q,
1661: ip_mtudisc_timeout);
1.54 lukem 1662: return (error);
1.65 matt 1663: #ifdef GATEWAY
1664: case IPCTL_MAXFLOWS:
1.67 thorpej 1665: {
1666: int s;
1667:
1.65 matt 1668: error = sysctl_int(oldp, oldlenp, newp, newlen,
1669: &ip_maxflows);
1.67 thorpej 1670: s = splsoftnet();
1.65 matt 1671: ipflow_reap(0);
1.67 thorpej 1672: splx(s);
1.65 matt 1673: return (error);
1.67 thorpej 1674: }
1.89 itojun 1675: #endif
1.90 itojun 1676: case IPCTL_HOSTZEROBROADCAST:
1677: return (sysctl_int(oldp, oldlenp, newp, newlen,
1678: &hostzeroisbroadcast));
1.89 itojun 1679: #if NGIF > 0
1680: case IPCTL_GIF_TTL:
1681: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1682: &ip_gif_ttl));
1.65 matt 1683: #endif
1.88 sommerfe 1684:
1.13 mycroft 1685: default:
1686: return (EOPNOTSUPP);
1687: }
1688: /* NOTREACHED */
1.1 cgd 1689: }
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