Annotation of src/sys/netinet/ip_input.c, Revision 1.140
1.140 ! matt 1: /* $NetBSD: ip_input.c,v 1.139 2001/11/04 13:42:27 matt 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"
1.135 thorpej 108: #include "opt_inet_csum.h"
1.1 cgd 109:
1.5 mycroft 110: #include <sys/param.h>
111: #include <sys/systm.h>
112: #include <sys/malloc.h>
113: #include <sys/mbuf.h>
114: #include <sys/domain.h>
115: #include <sys/protosw.h>
116: #include <sys/socket.h>
1.44 thorpej 117: #include <sys/socketvar.h>
1.5 mycroft 118: #include <sys/errno.h>
119: #include <sys/time.h>
120: #include <sys/kernel.h>
1.72 thorpej 121: #include <sys/pool.h>
1.28 christos 122: #include <sys/sysctl.h>
1.1 cgd 123:
1.5 mycroft 124: #include <net/if.h>
1.44 thorpej 125: #include <net/if_dl.h>
1.5 mycroft 126: #include <net/route.h>
1.45 mrg 127: #include <net/pfil.h>
1.1 cgd 128:
1.5 mycroft 129: #include <netinet/in.h>
130: #include <netinet/in_systm.h>
131: #include <netinet/ip.h>
132: #include <netinet/in_pcb.h>
133: #include <netinet/in_var.h>
134: #include <netinet/ip_var.h>
135: #include <netinet/ip_icmp.h>
1.89 itojun 136: /* just for gif_ttl */
137: #include <netinet/in_gif.h>
138: #include "gif.h"
1.111 jdolecek 139:
140: #ifdef MROUTING
141: #include <netinet/ip_mroute.h>
142: #endif
1.89 itojun 143:
144: #ifdef IPSEC
145: #include <netinet6/ipsec.h>
146: #include <netkey/key.h>
147: #endif
1.44 thorpej 148:
1.1 cgd 149: #ifndef IPFORWARDING
150: #ifdef GATEWAY
151: #define IPFORWARDING 1 /* forward IP packets not for us */
152: #else /* GATEWAY */
153: #define IPFORWARDING 0 /* don't forward IP packets not for us */
154: #endif /* GATEWAY */
155: #endif /* IPFORWARDING */
156: #ifndef IPSENDREDIRECTS
157: #define IPSENDREDIRECTS 1
158: #endif
1.26 thorpej 159: #ifndef IPFORWSRCRT
1.47 cjs 160: #define IPFORWSRCRT 1 /* forward source-routed packets */
161: #endif
162: #ifndef IPALLOWSRCRT
1.48 mrg 163: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 164: #endif
1.53 kml 165: #ifndef IPMTUDISC
166: #define IPMTUDISC 0
167: #endif
1.60 kml 168: #ifndef IPMTUDISCTIMEOUT
1.61 kml 169: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 170: #endif
1.53 kml 171:
1.27 thorpej 172: /*
173: * Note: DIRECTED_BROADCAST is handled this way so that previous
174: * configuration using this option will Just Work.
175: */
176: #ifndef IPDIRECTEDBCAST
177: #ifdef DIRECTED_BROADCAST
178: #define IPDIRECTEDBCAST 1
179: #else
180: #define IPDIRECTEDBCAST 0
181: #endif /* DIRECTED_BROADCAST */
182: #endif /* IPDIRECTEDBCAST */
1.1 cgd 183: int ipforwarding = IPFORWARDING;
184: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 185: int ip_defttl = IPDEFTTL;
1.26 thorpej 186: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 187: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 188: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 189: int ip_mtudisc = IPMTUDISC;
1.60 kml 190: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 191: #ifdef DIAGNOSTIC
192: int ipprintfs = 0;
193: #endif
194:
1.60 kml 195: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
196:
1.1 cgd 197: extern struct domain inetdomain;
198: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 199: struct in_ifaddrhead in_ifaddr;
1.57 tls 200: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 201: struct ifqueue ipintrq;
1.63 matt 202: struct ipstat ipstat;
203: u_int16_t ip_id;
1.75 thorpej 204:
1.121 thorpej 205: #ifdef PFIL_HOOKS
206: struct pfil_head inet_pfil_hook;
207: #endif
208:
1.63 matt 209: struct ipqhead ipq;
1.75 thorpej 210: int ipq_locked;
1.131 itojun 211: int ip_nfragpackets = 0;
1.133 itojun 212: int ip_maxfragpackets = 200;
1.75 thorpej 213:
214: static __inline int ipq_lock_try __P((void));
215: static __inline void ipq_unlock __P((void));
216:
217: static __inline int
218: ipq_lock_try()
219: {
220: int s;
221:
1.132 thorpej 222: /*
223: * Use splvm() -- we're bloking things that would cause
224: * mbuf allocation.
225: */
226: s = splvm();
1.75 thorpej 227: if (ipq_locked) {
228: splx(s);
229: return (0);
230: }
231: ipq_locked = 1;
232: splx(s);
233: return (1);
234: }
235:
236: static __inline void
237: ipq_unlock()
238: {
239: int s;
240:
1.132 thorpej 241: s = splvm();
1.75 thorpej 242: ipq_locked = 0;
243: splx(s);
244: }
245:
246: #ifdef DIAGNOSTIC
247: #define IPQ_LOCK() \
248: do { \
249: if (ipq_lock_try() == 0) { \
250: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
251: panic("ipq_lock"); \
252: } \
253: } while (0)
254: #define IPQ_LOCK_CHECK() \
255: do { \
256: if (ipq_locked == 0) { \
257: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
258: panic("ipq lock check"); \
259: } \
260: } while (0)
261: #else
262: #define IPQ_LOCK() (void) ipq_lock_try()
263: #define IPQ_LOCK_CHECK() /* nothing */
264: #endif
265:
266: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 267:
1.72 thorpej 268: struct pool ipqent_pool;
269:
1.135 thorpej 270: #ifdef INET_CSUM_COUNTERS
271: #include <sys/device.h>
272:
273: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
274: NULL, "inet", "hwcsum bad");
275: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
276: NULL, "inet", "hwcsum ok");
277: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
278: NULL, "inet", "swcsum");
279:
280: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
281:
282: #else
283:
284: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
285:
286: #endif /* INET_CSUM_COUNTERS */
287:
1.1 cgd 288: /*
289: * We need to save the IP options in case a protocol wants to respond
290: * to an incoming packet over the same route if the packet got here
291: * using IP source routing. This allows connection establishment and
292: * maintenance when the remote end is on a network that is not known
293: * to us.
294: */
295: int ip_nhops = 0;
296: static struct ip_srcrt {
297: struct in_addr dst; /* final destination */
298: char nop; /* one NOP to align */
299: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
300: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
301: } ip_srcrt;
302:
1.13 mycroft 303: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 304:
1.1 cgd 305: /*
306: * IP initialization: fill in IP protocol switch table.
307: * All protocols not implemented in kernel go to raw IP protocol handler.
308: */
1.8 mycroft 309: void
1.1 cgd 310: ip_init()
311: {
1.109 augustss 312: struct protosw *pr;
313: int i;
1.1 cgd 314:
1.72 thorpej 315: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
316: 0, NULL, NULL, M_IPQ);
317:
1.1 cgd 318: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
319: if (pr == 0)
320: panic("ip_init");
321: for (i = 0; i < IPPROTO_MAX; i++)
322: ip_protox[i] = pr - inetsw;
323: for (pr = inetdomain.dom_protosw;
324: pr < inetdomain.dom_protoswNPROTOSW; pr++)
325: if (pr->pr_domain->dom_family == PF_INET &&
326: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
327: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 328: LIST_INIT(&ipq);
1.1 cgd 329: ip_id = time.tv_sec & 0xffff;
330: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 331: TAILQ_INIT(&in_ifaddr);
1.120 ad 332: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
333: M_WAITOK, &in_ifaddrhash);
1.60 kml 334: if (ip_mtudisc != 0)
335: ip_mtudisc_timeout_q =
336: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 337: #ifdef GATEWAY
338: ipflow_init();
339: #endif
1.121 thorpej 340:
341: #ifdef PFIL_HOOKS
342: /* Register our Packet Filter hook. */
1.126 thorpej 343: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
344: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 345: i = pfil_head_register(&inet_pfil_hook);
346: if (i != 0)
347: printf("ip_init: WARNING: unable to register pfil hook, "
348: "error %d\n", i);
349: #endif /* PFIL_HOOKS */
1.135 thorpej 350:
351: #ifdef INET_CSUM_COUNTERS
352: evcnt_attach_static(&ip_hwcsum_bad);
353: evcnt_attach_static(&ip_hwcsum_ok);
354: evcnt_attach_static(&ip_swcsum);
355: #endif /* INET_CSUM_COUNTERS */
1.1 cgd 356: }
357:
358: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
359: struct route ipforward_rt;
360:
361: /*
1.89 itojun 362: * IP software interrupt routine
363: */
364: void
365: ipintr()
366: {
367: int s;
368: struct mbuf *m;
369:
370: while (1) {
1.132 thorpej 371: s = splnet();
1.89 itojun 372: IF_DEQUEUE(&ipintrq, m);
373: splx(s);
374: if (m == 0)
375: return;
376: ip_input(m);
377: }
378: }
379:
380: /*
1.1 cgd 381: * Ip input routine. Checksum and byte swap header. If fragmented
382: * try to reassemble. Process options. Pass to next level.
383: */
1.8 mycroft 384: void
1.89 itojun 385: ip_input(struct mbuf *m)
1.1 cgd 386: {
1.109 augustss 387: struct ip *ip = NULL;
388: struct ipq *fp;
389: struct in_ifaddr *ia;
390: struct ifaddr *ifa;
1.25 cgd 391: struct ipqent *ipqe;
1.89 itojun 392: int hlen = 0, mff, len;
1.100 itojun 393: int downmatch;
1.1 cgd 394:
395: #ifdef DIAGNOSTIC
396: if ((m->m_flags & M_PKTHDR) == 0)
397: panic("ipintr no HDR");
398: #endif
1.89 itojun 399: #ifdef IPSEC
400: /*
401: * should the inner packet be considered authentic?
402: * see comment in ah4_input().
403: */
404: if (m) {
405: m->m_flags &= ~M_AUTHIPHDR;
406: m->m_flags &= ~M_AUTHIPDGM;
407: }
408: #endif
1.1 cgd 409: /*
410: * If no IP addresses have been set yet but the interfaces
411: * are receiving, can't do anything with incoming packets yet.
412: */
1.140 ! matt 413: if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1 cgd 414: goto bad;
415: ipstat.ips_total++;
416: if (m->m_len < sizeof (struct ip) &&
417: (m = m_pullup(m, sizeof (struct ip))) == 0) {
418: ipstat.ips_toosmall++;
1.89 itojun 419: return;
1.1 cgd 420: }
421: ip = mtod(m, struct ip *);
1.13 mycroft 422: if (ip->ip_v != IPVERSION) {
423: ipstat.ips_badvers++;
424: goto bad;
425: }
1.1 cgd 426: hlen = ip->ip_hl << 2;
427: if (hlen < sizeof(struct ip)) { /* minimum header length */
428: ipstat.ips_badhlen++;
429: goto bad;
430: }
431: if (hlen > m->m_len) {
432: if ((m = m_pullup(m, hlen)) == 0) {
433: ipstat.ips_badhlen++;
1.89 itojun 434: return;
1.1 cgd 435: }
436: ip = mtod(m, struct ip *);
437: }
1.98 thorpej 438:
1.85 hwr 439: /*
1.99 thorpej 440: * RFC1122: packets with a multicast source address are
1.98 thorpej 441: * not allowed.
1.85 hwr 442: */
443: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 444: ipstat.ips_badaddr++;
1.85 hwr 445: goto bad;
1.129 itojun 446: }
447:
448: /* 127/8 must not appear on wire - RFC1122 */
449: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
450: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 451: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
452: ipstat.ips_badaddr++;
1.129 itojun 453: goto bad;
1.130 itojun 454: }
1.85 hwr 455: }
456:
1.135 thorpej 457: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 458: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 459: M_CSUM_IPv4_BAD)) {
460: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
461: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
462: goto badcsum;
463:
464: case M_CSUM_IPv4:
465: /* Checksum was okay. */
466: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
467: break;
468:
469: default:
470: /* Must compute it ourselves. */
471: INET_CSUM_COUNTER_INCR(&ip_swcsum);
472: if (in_cksum(m, hlen) != 0)
473: goto bad;
474: break;
1.1 cgd 475: }
476:
1.121 thorpej 477: /* Retrieve the packet length. */
478: len = ntohs(ip->ip_len);
1.81 proff 479:
480: /*
481: * Check for additional length bogosity
482: */
1.84 proff 483: if (len < hlen) {
1.81 proff 484: ipstat.ips_badlen++;
485: goto bad;
486: }
1.1 cgd 487:
488: /*
489: * Check that the amount of data in the buffers
490: * is as at least much as the IP header would have us expect.
491: * Trim mbufs if longer than we expect.
492: * Drop packet if shorter than we expect.
493: */
1.35 mycroft 494: if (m->m_pkthdr.len < len) {
1.1 cgd 495: ipstat.ips_tooshort++;
496: goto bad;
497: }
1.35 mycroft 498: if (m->m_pkthdr.len > len) {
1.1 cgd 499: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 500: m->m_len = len;
501: m->m_pkthdr.len = len;
1.1 cgd 502: } else
1.35 mycroft 503: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 504: }
505:
1.94 itojun 506: #ifdef IPSEC
507: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
508: m->m_flags &= ~M_CANFASTFWD;
509: #else
1.64 thorpej 510: /*
511: * Assume that we can create a fast-forward IP flow entry
512: * based on this packet.
513: */
514: m->m_flags |= M_CANFASTFWD;
1.94 itojun 515: #endif
1.64 thorpej 516:
1.36 mrg 517: #ifdef PFIL_HOOKS
1.33 mrg 518: /*
1.64 thorpej 519: * Run through list of hooks for input packets. If there are any
520: * filters which require that additional packets in the flow are
521: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
522: * Note that filters must _never_ set this flag, as another filter
523: * in the list may have previously cleared it.
1.33 mrg 524: */
1.127 itojun 525: /*
526: * let ipfilter look at packet on the wire,
527: * not the decapsulated packet.
528: */
529: #ifdef IPSEC
1.136 itojun 530: if (!ipsec_getnhist(m))
1.127 itojun 531: #else
532: if (1)
533: #endif
534: {
535: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
536: PFIL_IN) != 0)
1.121 thorpej 537: return;
1.127 itojun 538: if (m == NULL)
539: return;
540: ip = mtod(m, struct ip *);
541: }
1.36 mrg 542: #endif /* PFIL_HOOKS */
1.123 thorpej 543:
544: #ifdef ALTQ
545: /* XXX Temporary until ALTQ is changed to use a pfil hook */
546: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
547: /* packet dropped by traffic conditioner */
548: return;
549: }
550: #endif
1.121 thorpej 551:
552: /*
553: * Convert fields to host representation.
554: */
555: NTOHS(ip->ip_len);
556: NTOHS(ip->ip_off);
1.33 mrg 557:
1.1 cgd 558: /*
559: * Process options and, if not destined for us,
560: * ship it on. ip_dooptions returns 1 when an
561: * error was detected (causing an icmp message
562: * to be sent and the original packet to be freed).
563: */
564: ip_nhops = 0; /* for source routed packets */
565: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 566: return;
1.1 cgd 567:
568: /*
569: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 570: *
571: * Traditional 4.4BSD did not consult IFF_UP at all.
572: * The behavior here is to treat addresses on !IFF_UP interface
573: * as not mine.
1.1 cgd 574: */
1.100 itojun 575: downmatch = 0;
1.140 ! matt 576: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 577: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
578: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
579: break;
1.100 itojun 580: else
581: downmatch++;
1.97 itojun 582: }
583: }
1.86 thorpej 584: if (ia != NULL)
585: goto ours;
1.57 tls 586: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140 ! matt 587: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
! 588: if (ifa->ifa_addr->sa_family != AF_INET)
! 589: continue;
1.57 tls 590: ia = ifatoia(ifa);
1.35 mycroft 591: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
592: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 593: /*
594: * Look for all-0's host part (old broadcast addr),
595: * either for subnet or net.
596: */
597: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 598: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 599: goto ours;
1.57 tls 600: /*
601: * An interface with IP address zero accepts
602: * all packets that arrive on that interface.
603: */
604: if (in_nullhost(ia->ia_addr.sin_addr))
605: goto ours;
1.1 cgd 606: }
607: }
1.18 mycroft 608: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 609: struct in_multi *inm;
610: #ifdef MROUTING
611: extern struct socket *ip_mrouter;
1.10 brezak 612:
613: if (m->m_flags & M_EXT) {
614: if ((m = m_pullup(m, hlen)) == 0) {
615: ipstat.ips_toosmall++;
1.89 itojun 616: return;
1.10 brezak 617: }
618: ip = mtod(m, struct ip *);
619: }
1.4 hpeyerl 620:
621: if (ip_mrouter) {
622: /*
623: * If we are acting as a multicast router, all
624: * incoming multicast packets are passed to the
625: * kernel-level multicast forwarding function.
626: * The packet is returned (relatively) intact; if
627: * ip_mforward() returns a non-zero value, the packet
628: * must be discarded, else it may be accepted below.
629: *
630: * (The IP ident field is put in the same byte order
631: * as expected when ip_mforward() is called from
632: * ip_output().)
633: */
1.13 mycroft 634: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
635: ipstat.ips_cantforward++;
1.4 hpeyerl 636: m_freem(m);
1.89 itojun 637: return;
1.4 hpeyerl 638: }
639:
640: /*
641: * The process-level routing demon needs to receive
642: * all multicast IGMP packets, whether or not this
643: * host belongs to their destination groups.
644: */
645: if (ip->ip_p == IPPROTO_IGMP)
646: goto ours;
1.13 mycroft 647: ipstat.ips_forward++;
1.4 hpeyerl 648: }
649: #endif
650: /*
651: * See if we belong to the destination multicast group on the
652: * arrival interface.
653: */
654: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
655: if (inm == NULL) {
1.13 mycroft 656: ipstat.ips_cantforward++;
1.4 hpeyerl 657: m_freem(m);
1.89 itojun 658: return;
1.4 hpeyerl 659: }
660: goto ours;
661: }
1.19 mycroft 662: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 663: in_nullhost(ip->ip_dst))
1.1 cgd 664: goto ours;
665:
666: /*
667: * Not for us; forward if possible and desirable.
668: */
669: if (ipforwarding == 0) {
670: ipstat.ips_cantforward++;
671: m_freem(m);
1.100 itojun 672: } else {
673: /*
674: * If ip_dst matched any of my address on !IFF_UP interface,
675: * and there's no IFF_UP interface that matches ip_dst,
676: * send icmp unreach. Forwarding it will result in in-kernel
677: * forwarding loop till TTL goes to 0.
678: */
679: if (downmatch) {
680: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
681: ipstat.ips_cantforward++;
682: return;
683: }
1.1 cgd 684: ip_forward(m, 0);
1.100 itojun 685: }
1.89 itojun 686: return;
1.1 cgd 687:
688: ours:
689: /*
690: * If offset or IP_MF are set, must reassemble.
691: * Otherwise, nothing need be done.
692: * (We could look in the reassembly queue to see
693: * if the packet was previously fragmented,
694: * but it's not worth the time; just let them time out.)
695: */
1.37 perry 696: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 697: /*
698: * Look for queue of fragments
699: * of this datagram.
700: */
1.75 thorpej 701: IPQ_LOCK();
1.140 ! matt 702: LIST_FOREACH(fp, &ipq, ipq_q)
1.1 cgd 703: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 704: in_hosteq(ip->ip_src, fp->ipq_src) &&
705: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 706: ip->ip_p == fp->ipq_p)
707: goto found;
708: fp = 0;
709: found:
710:
711: /*
712: * Adjust ip_len to not reflect header,
1.25 cgd 713: * set ipqe_mff if more fragments are expected,
1.1 cgd 714: * convert offset of this to bytes.
715: */
716: ip->ip_len -= hlen;
1.25 cgd 717: mff = (ip->ip_off & IP_MF) != 0;
718: if (mff) {
1.16 cgd 719: /*
720: * Make sure that fragments have a data length
721: * that's a non-zero multiple of 8 bytes.
722: */
1.17 cgd 723: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 724: ipstat.ips_badfrags++;
1.75 thorpej 725: IPQ_UNLOCK();
1.16 cgd 726: goto bad;
727: }
728: }
1.1 cgd 729: ip->ip_off <<= 3;
730:
731: /*
732: * If datagram marked as having more fragments
733: * or if this is not the first fragment,
734: * attempt reassembly; if it succeeds, proceed.
735: */
1.25 cgd 736: if (mff || ip->ip_off) {
1.1 cgd 737: ipstat.ips_fragments++;
1.72 thorpej 738: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 739: if (ipqe == NULL) {
740: ipstat.ips_rcvmemdrop++;
1.75 thorpej 741: IPQ_UNLOCK();
1.25 cgd 742: goto bad;
743: }
744: ipqe->ipqe_mff = mff;
1.50 thorpej 745: ipqe->ipqe_m = m;
1.25 cgd 746: ipqe->ipqe_ip = ip;
1.50 thorpej 747: m = ip_reass(ipqe, fp);
1.75 thorpej 748: if (m == 0) {
749: IPQ_UNLOCK();
1.89 itojun 750: return;
1.75 thorpej 751: }
1.13 mycroft 752: ipstat.ips_reassembled++;
1.50 thorpej 753: ip = mtod(m, struct ip *);
1.74 thorpej 754: hlen = ip->ip_hl << 2;
1.79 mycroft 755: ip->ip_len += hlen;
1.1 cgd 756: } else
757: if (fp)
758: ip_freef(fp);
1.75 thorpej 759: IPQ_UNLOCK();
1.79 mycroft 760: }
1.128 itojun 761:
762: #ifdef IPSEC
763: /*
764: * enforce IPsec policy checking if we are seeing last header.
765: * note that we do not visit this with protocols with pcb layer
766: * code - like udp/tcp/raw ip.
767: */
768: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
769: ipsec4_in_reject(m, NULL)) {
770: ipsecstat.in_polvio++;
771: goto bad;
772: }
773: #endif
1.1 cgd 774:
775: /*
776: * Switch out to protocol's input routine.
777: */
1.82 aidan 778: #if IFA_STATS
1.122 itojun 779: if (ia && ip)
780: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 781: #endif
1.1 cgd 782: ipstat.ips_delivered++;
1.89 itojun 783: {
784: int off = hlen, nh = ip->ip_p;
785:
786: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
787: return;
788: }
1.1 cgd 789: bad:
790: m_freem(m);
1.135 thorpej 791: return;
792:
793: badcsum:
794: ipstat.ips_badsum++;
795: m_freem(m);
1.1 cgd 796: }
797:
798: /*
799: * Take incoming datagram fragment and try to
800: * reassemble it into whole datagram. If a chain for
801: * reassembly of this datagram already exists, then it
802: * is given as fp; otherwise have to make a chain.
803: */
1.50 thorpej 804: struct mbuf *
1.25 cgd 805: ip_reass(ipqe, fp)
1.109 augustss 806: struct ipqent *ipqe;
807: struct ipq *fp;
1.1 cgd 808: {
1.109 augustss 809: struct mbuf *m = ipqe->ipqe_m;
810: struct ipqent *nq, *p, *q;
1.25 cgd 811: struct ip *ip;
1.1 cgd 812: struct mbuf *t;
1.25 cgd 813: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 814: int i, next;
815:
1.75 thorpej 816: IPQ_LOCK_CHECK();
817:
1.1 cgd 818: /*
819: * Presence of header sizes in mbufs
820: * would confuse code below.
821: */
822: m->m_data += hlen;
823: m->m_len -= hlen;
824:
825: /*
826: * If first fragment to arrive, create a reassembly queue.
827: */
828: if (fp == 0) {
1.131 itojun 829: /*
830: * Enforce upper bound on number of fragmented packets
831: * for which we attempt reassembly;
832: * If maxfrag is 0, never accept fragments.
833: * If maxfrag is -1, accept all fragments without limitation.
834: */
835: if (ip_maxfragpackets < 0)
836: ;
837: else if (ip_nfragpackets >= ip_maxfragpackets)
838: goto dropfrag;
839: ip_nfragpackets++;
1.50 thorpej 840: MALLOC(fp, struct ipq *, sizeof (struct ipq),
841: M_FTABLE, M_NOWAIT);
842: if (fp == NULL)
1.1 cgd 843: goto dropfrag;
1.25 cgd 844: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 845: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 846: fp->ipq_p = ipqe->ipqe_ip->ip_p;
847: fp->ipq_id = ipqe->ipqe_ip->ip_id;
848: LIST_INIT(&fp->ipq_fragq);
849: fp->ipq_src = ipqe->ipqe_ip->ip_src;
850: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
851: p = NULL;
1.1 cgd 852: goto insert;
853: }
854:
855: /*
856: * Find a segment which begins after this one does.
857: */
1.140 ! matt 858: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
! 859: p = q, q = LIST_NEXT(q, ipqe_q))
1.25 cgd 860: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 861: break;
862:
863: /*
864: * If there is a preceding segment, it may provide some of
865: * our data already. If so, drop the data from the incoming
866: * segment. If it provides all of our data, drop us.
867: */
1.25 cgd 868: if (p != NULL) {
869: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
870: ipqe->ipqe_ip->ip_off;
1.1 cgd 871: if (i > 0) {
1.25 cgd 872: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 873: goto dropfrag;
1.50 thorpej 874: m_adj(ipqe->ipqe_m, i);
1.25 cgd 875: ipqe->ipqe_ip->ip_off += i;
876: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 877: }
878: }
879:
880: /*
881: * While we overlap succeeding segments trim them or,
882: * if they are completely covered, dequeue them.
883: */
1.25 cgd 884: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
885: q->ipqe_ip->ip_off; q = nq) {
886: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
887: q->ipqe_ip->ip_off;
888: if (i < q->ipqe_ip->ip_len) {
889: q->ipqe_ip->ip_len -= i;
890: q->ipqe_ip->ip_off += i;
1.50 thorpej 891: m_adj(q->ipqe_m, i);
1.1 cgd 892: break;
893: }
1.140 ! matt 894: nq = LIST_NEXT(q, ipqe_q);
1.50 thorpej 895: m_freem(q->ipqe_m);
1.25 cgd 896: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 897: pool_put(&ipqent_pool, q);
1.1 cgd 898: }
899:
900: insert:
901: /*
902: * Stick new segment in its place;
903: * check for complete reassembly.
904: */
1.25 cgd 905: if (p == NULL) {
906: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
907: } else {
908: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
909: }
1.1 cgd 910: next = 0;
1.140 ! matt 911: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
! 912: p = q, q = LIST_NEXT(q, ipqe_q)) {
1.25 cgd 913: if (q->ipqe_ip->ip_off != next)
1.1 cgd 914: return (0);
1.25 cgd 915: next += q->ipqe_ip->ip_len;
1.1 cgd 916: }
1.25 cgd 917: if (p->ipqe_mff)
1.1 cgd 918: return (0);
919:
920: /*
1.41 thorpej 921: * Reassembly is complete. Check for a bogus message size and
922: * concatenate fragments.
1.1 cgd 923: */
1.140 ! matt 924: q = LIST_FIRST(&fp->ipq_fragq);
1.25 cgd 925: ip = q->ipqe_ip;
1.41 thorpej 926: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
927: ipstat.ips_toolong++;
928: ip_freef(fp);
929: return (0);
930: }
1.50 thorpej 931: m = q->ipqe_m;
1.1 cgd 932: t = m->m_next;
933: m->m_next = 0;
934: m_cat(m, t);
1.140 ! matt 935: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 936: pool_put(&ipqent_pool, q);
1.25 cgd 937: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 938: t = q->ipqe_m;
1.140 ! matt 939: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 940: pool_put(&ipqent_pool, q);
1.1 cgd 941: m_cat(m, t);
942: }
943:
944: /*
945: * Create header for new ip packet by
946: * modifying header of first packet;
947: * dequeue and discard fragment reassembly header.
948: * Make header visible.
949: */
950: ip->ip_len = next;
1.25 cgd 951: ip->ip_src = fp->ipq_src;
952: ip->ip_dst = fp->ipq_dst;
953: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 954: FREE(fp, M_FTABLE);
1.131 itojun 955: ip_nfragpackets--;
1.1 cgd 956: m->m_len += (ip->ip_hl << 2);
957: m->m_data -= (ip->ip_hl << 2);
958: /* some debugging cruft by sklower, below, will go away soon */
959: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 960: int plen = 0;
1.50 thorpej 961: for (t = m; t; t = t->m_next)
962: plen += t->m_len;
963: m->m_pkthdr.len = plen;
1.1 cgd 964: }
1.50 thorpej 965: return (m);
1.1 cgd 966:
967: dropfrag:
968: ipstat.ips_fragdropped++;
969: m_freem(m);
1.72 thorpej 970: pool_put(&ipqent_pool, ipqe);
1.1 cgd 971: return (0);
972: }
973:
974: /*
975: * Free a fragment reassembly header and all
976: * associated datagrams.
977: */
1.8 mycroft 978: void
1.1 cgd 979: ip_freef(fp)
980: struct ipq *fp;
981: {
1.109 augustss 982: struct ipqent *q, *p;
1.1 cgd 983:
1.75 thorpej 984: IPQ_LOCK_CHECK();
985:
1.140 ! matt 986: for (q = LIST_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
! 987: p = LIST_NEXT(q, ipqe_q);
1.50 thorpej 988: m_freem(q->ipqe_m);
1.25 cgd 989: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 990: pool_put(&ipqent_pool, q);
1.1 cgd 991: }
1.25 cgd 992: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 993: FREE(fp, M_FTABLE);
1.131 itojun 994: ip_nfragpackets--;
1.1 cgd 995: }
996:
997: /*
998: * IP timer processing;
999: * if a timer expires on a reassembly
1000: * queue, discard it.
1001: */
1.8 mycroft 1002: void
1.1 cgd 1003: ip_slowtimo()
1004: {
1.109 augustss 1005: struct ipq *fp, *nfp;
1.24 mycroft 1006: int s = splsoftnet();
1.1 cgd 1007:
1.75 thorpej 1008: IPQ_LOCK();
1.140 ! matt 1009: for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
! 1010: nfp = LIST_NEXT(fp, ipq_q);
1.25 cgd 1011: if (--fp->ipq_ttl == 0) {
1.1 cgd 1012: ipstat.ips_fragtimeout++;
1.25 cgd 1013: ip_freef(fp);
1.1 cgd 1014: }
1015: }
1.131 itojun 1016: /*
1017: * If we are over the maximum number of fragments
1018: * (due to the limit being lowered), drain off
1019: * enough to get down to the new limit.
1020: */
1021: if (ip_maxfragpackets < 0)
1022: ;
1023: else {
1.140 ! matt 1024: while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
! 1025: ip_freef(LIST_FIRST(&ipq));
1.131 itojun 1026: }
1.75 thorpej 1027: IPQ_UNLOCK();
1.63 matt 1028: #ifdef GATEWAY
1029: ipflow_slowtimo();
1030: #endif
1.1 cgd 1031: splx(s);
1032: }
1033:
1034: /*
1035: * Drain off all datagram fragments.
1036: */
1.8 mycroft 1037: void
1.1 cgd 1038: ip_drain()
1039: {
1040:
1.75 thorpej 1041: /*
1042: * We may be called from a device's interrupt context. If
1043: * the ipq is already busy, just bail out now.
1044: */
1045: if (ipq_lock_try() == 0)
1046: return;
1047:
1.140 ! matt 1048: while (LIST_FIRST(&ipq) != NULL) {
1.1 cgd 1049: ipstat.ips_fragdropped++;
1.140 ! matt 1050: ip_freef(LIST_FIRST(&ipq));
1.1 cgd 1051: }
1.75 thorpej 1052:
1053: IPQ_UNLOCK();
1.1 cgd 1054: }
1055:
1056: /*
1057: * Do option processing on a datagram,
1058: * possibly discarding it if bad options are encountered,
1059: * or forwarding it if source-routed.
1060: * Returns 1 if packet has been forwarded/freed,
1061: * 0 if the packet should be processed further.
1062: */
1.8 mycroft 1063: int
1.1 cgd 1064: ip_dooptions(m)
1065: struct mbuf *m;
1066: {
1.109 augustss 1067: struct ip *ip = mtod(m, struct ip *);
1068: u_char *cp, *cp0;
1069: struct ip_timestamp *ipt;
1070: struct in_ifaddr *ia;
1.1 cgd 1071: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1072: struct in_addr dst;
1.1 cgd 1073: n_time ntime;
1074:
1.13 mycroft 1075: dst = ip->ip_dst;
1.1 cgd 1076: cp = (u_char *)(ip + 1);
1077: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1078: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1079: opt = cp[IPOPT_OPTVAL];
1080: if (opt == IPOPT_EOL)
1081: break;
1082: if (opt == IPOPT_NOP)
1083: optlen = 1;
1084: else {
1.113 itojun 1085: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1086: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1087: goto bad;
1088: }
1.1 cgd 1089: optlen = cp[IPOPT_OLEN];
1.114 itojun 1090: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1091: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1092: goto bad;
1093: }
1094: }
1095: switch (opt) {
1096:
1097: default:
1098: break;
1099:
1100: /*
1101: * Source routing with record.
1102: * Find interface with current destination address.
1103: * If none on this machine then drop if strictly routed,
1104: * or do nothing if loosely routed.
1105: * Record interface address and bring up next address
1106: * component. If strictly routed make sure next
1107: * address is on directly accessible net.
1108: */
1109: case IPOPT_LSRR:
1110: case IPOPT_SSRR:
1.47 cjs 1111: if (ip_allowsrcrt == 0) {
1112: type = ICMP_UNREACH;
1113: code = ICMP_UNREACH_NET_PROHIB;
1114: goto bad;
1115: }
1.114 itojun 1116: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1117: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1118: goto bad;
1119: }
1.1 cgd 1120: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1121: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1122: goto bad;
1123: }
1124: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1125: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1126: if (ia == 0) {
1127: if (opt == IPOPT_SSRR) {
1128: type = ICMP_UNREACH;
1129: code = ICMP_UNREACH_SRCFAIL;
1130: goto bad;
1131: }
1132: /*
1133: * Loose routing, and not at next destination
1134: * yet; nothing to do except forward.
1135: */
1136: break;
1137: }
1138: off--; /* 0 origin */
1.112 sommerfe 1139: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1140: /*
1141: * End of source route. Should be for us.
1142: */
1143: save_rte(cp, ip->ip_src);
1144: break;
1145: }
1146: /*
1147: * locate outgoing interface
1148: */
1149: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1150: sizeof(ipaddr.sin_addr));
1.96 thorpej 1151: if (opt == IPOPT_SSRR)
1152: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1153: else
1.1 cgd 1154: ia = ip_rtaddr(ipaddr.sin_addr);
1155: if (ia == 0) {
1156: type = ICMP_UNREACH;
1157: code = ICMP_UNREACH_SRCFAIL;
1158: goto bad;
1159: }
1160: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1161: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1162: (caddr_t)(cp + off), sizeof(struct in_addr));
1163: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1164: /*
1165: * Let ip_intr's mcast routing check handle mcast pkts
1166: */
1.18 mycroft 1167: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1168: break;
1169:
1170: case IPOPT_RR:
1.114 itojun 1171: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1172: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1173: goto bad;
1174: }
1.1 cgd 1175: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1176: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1177: goto bad;
1178: }
1179: /*
1180: * If no space remains, ignore.
1181: */
1182: off--; /* 0 origin */
1.112 sommerfe 1183: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1184: break;
1185: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1186: sizeof(ipaddr.sin_addr));
1187: /*
1188: * locate outgoing interface; if we're the destination,
1189: * use the incoming interface (should be same).
1190: */
1.96 thorpej 1191: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1192: == NULL &&
1193: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1194: type = ICMP_UNREACH;
1195: code = ICMP_UNREACH_HOST;
1196: goto bad;
1197: }
1.20 mycroft 1198: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1199: (caddr_t)(cp + off), sizeof(struct in_addr));
1200: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1201: break;
1202:
1203: case IPOPT_TS:
1204: code = cp - (u_char *)ip;
1205: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1206: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1207: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1208: goto bad;
1.114 itojun 1209: }
1210: if (ipt->ipt_ptr < 5) {
1211: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1212: goto bad;
1213: }
1.15 cgd 1214: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1215: if (++ipt->ipt_oflw == 0) {
1216: code = (u_char *)&ipt->ipt_ptr -
1217: (u_char *)ip;
1.1 cgd 1218: goto bad;
1.114 itojun 1219: }
1.1 cgd 1220: break;
1221: }
1.104 thorpej 1222: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1223: switch (ipt->ipt_flg) {
1224:
1225: case IPOPT_TS_TSONLY:
1226: break;
1227:
1228: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1229: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1230: sizeof(struct in_addr) > ipt->ipt_len) {
1231: code = (u_char *)&ipt->ipt_ptr -
1232: (u_char *)ip;
1.1 cgd 1233: goto bad;
1.114 itojun 1234: }
1.13 mycroft 1235: ipaddr.sin_addr = dst;
1.96 thorpej 1236: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1237: m->m_pkthdr.rcvif));
1.13 mycroft 1238: if (ia == 0)
1239: continue;
1.104 thorpej 1240: bcopy(&ia->ia_addr.sin_addr,
1241: cp0, sizeof(struct in_addr));
1.1 cgd 1242: ipt->ipt_ptr += sizeof(struct in_addr);
1243: break;
1244:
1245: case IPOPT_TS_PRESPEC:
1.66 thorpej 1246: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1247: sizeof(struct in_addr) > ipt->ipt_len) {
1248: code = (u_char *)&ipt->ipt_ptr -
1249: (u_char *)ip;
1.1 cgd 1250: goto bad;
1.114 itojun 1251: }
1.104 thorpej 1252: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1253: sizeof(struct in_addr));
1.96 thorpej 1254: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1255: == NULL)
1.1 cgd 1256: continue;
1257: ipt->ipt_ptr += sizeof(struct in_addr);
1258: break;
1259:
1260: default:
1.114 itojun 1261: /* XXX can't take &ipt->ipt_flg */
1262: code = (u_char *)&ipt->ipt_ptr -
1263: (u_char *)ip + 1;
1.1 cgd 1264: goto bad;
1265: }
1266: ntime = iptime();
1.107 thorpej 1267: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1268: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1269: sizeof(n_time));
1270: ipt->ipt_ptr += sizeof(n_time);
1271: }
1272: }
1273: if (forward) {
1.26 thorpej 1274: if (ip_forwsrcrt == 0) {
1275: type = ICMP_UNREACH;
1276: code = ICMP_UNREACH_SRCFAIL;
1277: goto bad;
1278: }
1.1 cgd 1279: ip_forward(m, 1);
1280: return (1);
1.13 mycroft 1281: }
1282: return (0);
1.1 cgd 1283: bad:
1.13 mycroft 1284: icmp_error(m, type, code, 0, 0);
1285: ipstat.ips_badoptions++;
1.1 cgd 1286: return (1);
1287: }
1288:
1289: /*
1290: * Given address of next destination (final or next hop),
1291: * return internet address info of interface to be used to get there.
1292: */
1293: struct in_ifaddr *
1294: ip_rtaddr(dst)
1295: struct in_addr dst;
1296: {
1.109 augustss 1297: struct sockaddr_in *sin;
1.1 cgd 1298:
1.19 mycroft 1299: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1300:
1.35 mycroft 1301: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1302: if (ipforward_rt.ro_rt) {
1303: RTFREE(ipforward_rt.ro_rt);
1304: ipforward_rt.ro_rt = 0;
1305: }
1306: sin->sin_family = AF_INET;
1307: sin->sin_len = sizeof(*sin);
1308: sin->sin_addr = dst;
1309:
1310: rtalloc(&ipforward_rt);
1311: }
1312: if (ipforward_rt.ro_rt == 0)
1313: return ((struct in_ifaddr *)0);
1.19 mycroft 1314: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1315: }
1316:
1317: /*
1318: * Save incoming source route for use in replies,
1319: * to be picked up later by ip_srcroute if the receiver is interested.
1320: */
1.13 mycroft 1321: void
1.1 cgd 1322: save_rte(option, dst)
1323: u_char *option;
1324: struct in_addr dst;
1325: {
1326: unsigned olen;
1327:
1328: olen = option[IPOPT_OLEN];
1329: #ifdef DIAGNOSTIC
1330: if (ipprintfs)
1.39 christos 1331: printf("save_rte: olen %d\n", olen);
1.89 itojun 1332: #endif /* 0 */
1.1 cgd 1333: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1334: return;
1335: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1336: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1337: ip_srcrt.dst = dst;
1338: }
1339:
1340: /*
1341: * Retrieve incoming source route for use in replies,
1342: * in the same form used by setsockopt.
1343: * The first hop is placed before the options, will be removed later.
1344: */
1345: struct mbuf *
1346: ip_srcroute()
1347: {
1.109 augustss 1348: struct in_addr *p, *q;
1349: struct mbuf *m;
1.1 cgd 1350:
1351: if (ip_nhops == 0)
1352: return ((struct mbuf *)0);
1353: m = m_get(M_DONTWAIT, MT_SOOPTS);
1354: if (m == 0)
1355: return ((struct mbuf *)0);
1356:
1.13 mycroft 1357: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1358:
1359: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1360: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1361: OPTSIZ;
1362: #ifdef DIAGNOSTIC
1363: if (ipprintfs)
1.39 christos 1364: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1365: #endif
1366:
1367: /*
1368: * First save first hop for return route
1369: */
1370: p = &ip_srcrt.route[ip_nhops - 1];
1371: *(mtod(m, struct in_addr *)) = *p--;
1372: #ifdef DIAGNOSTIC
1373: if (ipprintfs)
1.39 christos 1374: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1375: #endif
1376:
1377: /*
1378: * Copy option fields and padding (nop) to mbuf.
1379: */
1380: ip_srcrt.nop = IPOPT_NOP;
1381: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1382: bcopy((caddr_t)&ip_srcrt.nop,
1383: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1384: q = (struct in_addr *)(mtod(m, caddr_t) +
1385: sizeof(struct in_addr) + OPTSIZ);
1386: #undef OPTSIZ
1387: /*
1388: * Record return path as an IP source route,
1389: * reversing the path (pointers are now aligned).
1390: */
1391: while (p >= ip_srcrt.route) {
1392: #ifdef DIAGNOSTIC
1393: if (ipprintfs)
1.39 christos 1394: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1395: #endif
1396: *q++ = *p--;
1397: }
1398: /*
1399: * Last hop goes to final destination.
1400: */
1401: *q = ip_srcrt.dst;
1402: #ifdef DIAGNOSTIC
1403: if (ipprintfs)
1.39 christos 1404: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1405: #endif
1406: return (m);
1407: }
1408:
1409: /*
1410: * Strip out IP options, at higher
1411: * level protocol in the kernel.
1412: * Second argument is buffer to which options
1413: * will be moved, and return value is their length.
1414: * XXX should be deleted; last arg currently ignored.
1415: */
1.8 mycroft 1416: void
1.1 cgd 1417: ip_stripoptions(m, mopt)
1.109 augustss 1418: struct mbuf *m;
1.1 cgd 1419: struct mbuf *mopt;
1420: {
1.109 augustss 1421: int i;
1.1 cgd 1422: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1423: caddr_t opts;
1.1 cgd 1424: int olen;
1425:
1.79 mycroft 1426: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1427: opts = (caddr_t)(ip + 1);
1428: i = m->m_len - (sizeof (struct ip) + olen);
1429: bcopy(opts + olen, opts, (unsigned)i);
1430: m->m_len -= olen;
1431: if (m->m_flags & M_PKTHDR)
1432: m->m_pkthdr.len -= olen;
1.79 mycroft 1433: ip->ip_len -= olen;
1434: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1435: }
1436:
1.139 matt 1437: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1438: 0, 0, 0, 0,
1439: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1440: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1441: EMSGSIZE, EHOSTUNREACH, 0, 0,
1442: 0, 0, 0, 0,
1443: ENOPROTOOPT
1444: };
1445:
1446: /*
1447: * Forward a packet. If some error occurs return the sender
1448: * an icmp packet. Note we can't always generate a meaningful
1449: * icmp message because icmp doesn't have a large enough repertoire
1450: * of codes and types.
1451: *
1452: * If not forwarding, just drop the packet. This could be confusing
1453: * if ipforwarding was zero but some routing protocol was advancing
1454: * us as a gateway to somewhere. However, we must let the routing
1455: * protocol deal with that.
1456: *
1457: * The srcrt parameter indicates whether the packet is being forwarded
1458: * via a source route.
1459: */
1.13 mycroft 1460: void
1.1 cgd 1461: ip_forward(m, srcrt)
1462: struct mbuf *m;
1463: int srcrt;
1464: {
1.109 augustss 1465: struct ip *ip = mtod(m, struct ip *);
1466: struct sockaddr_in *sin;
1467: struct rtentry *rt;
1.28 christos 1468: int error, type = 0, code = 0;
1.1 cgd 1469: struct mbuf *mcopy;
1.13 mycroft 1470: n_long dest;
1471: struct ifnet *destifp;
1.89 itojun 1472: #ifdef IPSEC
1473: struct ifnet dummyifp;
1474: #endif
1.135 thorpej 1475:
1476: /*
1477: * Clear any in-bound checksum flags for this packet.
1478: */
1479: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1480:
1.13 mycroft 1481: dest = 0;
1.1 cgd 1482: #ifdef DIAGNOSTIC
1483: if (ipprintfs)
1.70 thorpej 1484: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1485: ntohl(ip->ip_src.s_addr),
1486: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1487: #endif
1.93 sommerfe 1488: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1489: ipstat.ips_cantforward++;
1490: m_freem(m);
1491: return;
1492: }
1493: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1494: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1495: return;
1496: }
1497: ip->ip_ttl -= IPTTLDEC;
1498:
1.19 mycroft 1499: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1500: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1501: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1502: if (ipforward_rt.ro_rt) {
1503: RTFREE(ipforward_rt.ro_rt);
1504: ipforward_rt.ro_rt = 0;
1505: }
1506: sin->sin_family = AF_INET;
1.35 mycroft 1507: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1508: sin->sin_addr = ip->ip_dst;
1509:
1510: rtalloc(&ipforward_rt);
1511: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1512: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1513: return;
1514: }
1515: rt = ipforward_rt.ro_rt;
1516: }
1517:
1518: /*
1.34 mycroft 1519: * Save at most 68 bytes of the packet in case
1.1 cgd 1520: * we need to generate an ICMP message to the src.
1.119 itojun 1521: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1522: */
1.119 itojun 1523: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1524: if (mcopy)
1525: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1526:
1527: /*
1528: * If forwarding packet using same interface that it came in on,
1529: * perhaps should send a redirect to sender to shortcut a hop.
1530: * Only send redirect if source is sending directly to us,
1531: * and if packet was not source routed (or has any options).
1532: * Also, don't send redirect if forwarding using a default route
1533: * or a route modified by a redirect.
1534: */
1535: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1536: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1537: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1538: ipsendredirects && !srcrt) {
1.19 mycroft 1539: if (rt->rt_ifa &&
1540: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1541: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1542: if (rt->rt_flags & RTF_GATEWAY)
1543: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1544: else
1545: dest = ip->ip_dst.s_addr;
1546: /*
1547: * Router requirements says to only send host
1548: * redirects.
1549: */
1550: type = ICMP_REDIRECT;
1551: code = ICMP_REDIRECT_HOST;
1.1 cgd 1552: #ifdef DIAGNOSTIC
1.77 thorpej 1553: if (ipprintfs)
1554: printf("redirect (%d) to %x\n", code,
1555: (u_int32_t)dest);
1.1 cgd 1556: #endif
1557: }
1558: }
1559:
1.89 itojun 1560: #ifdef IPSEC
1.134 lukem 1561: /* Don't lookup socket in forwarding case */
1.127 itojun 1562: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1563: #endif
1.27 thorpej 1564: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1565: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1566: if (error)
1567: ipstat.ips_cantforward++;
1568: else {
1569: ipstat.ips_forward++;
1570: if (type)
1571: ipstat.ips_redirectsent++;
1572: else {
1.63 matt 1573: if (mcopy) {
1574: #ifdef GATEWAY
1.64 thorpej 1575: if (mcopy->m_flags & M_CANFASTFWD)
1576: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1577: #endif
1.1 cgd 1578: m_freem(mcopy);
1.63 matt 1579: }
1.1 cgd 1580: return;
1581: }
1582: }
1583: if (mcopy == NULL)
1584: return;
1.13 mycroft 1585: destifp = NULL;
1586:
1.1 cgd 1587: switch (error) {
1588:
1589: case 0: /* forwarded, but need redirect */
1590: /* type, code set above */
1591: break;
1592:
1593: case ENETUNREACH: /* shouldn't happen, checked above */
1594: case EHOSTUNREACH:
1595: case ENETDOWN:
1596: case EHOSTDOWN:
1597: default:
1598: type = ICMP_UNREACH;
1599: code = ICMP_UNREACH_HOST;
1600: break;
1601:
1602: case EMSGSIZE:
1603: type = ICMP_UNREACH;
1604: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1605: #ifndef IPSEC
1.13 mycroft 1606: if (ipforward_rt.ro_rt)
1607: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1608: #else
1609: /*
1610: * If the packet is routed over IPsec tunnel, tell the
1611: * originator the tunnel MTU.
1612: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1613: * XXX quickhack!!!
1614: */
1615: if (ipforward_rt.ro_rt) {
1616: struct secpolicy *sp;
1617: int ipsecerror;
1.95 itojun 1618: size_t ipsechdr;
1.89 itojun 1619: struct route *ro;
1620:
1621: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1622: IPSEC_DIR_OUTBOUND,
1623: IP_FORWARDING,
1624: &ipsecerror);
1.89 itojun 1625:
1626: if (sp == NULL)
1627: destifp = ipforward_rt.ro_rt->rt_ifp;
1628: else {
1629: /* count IPsec header size */
1.95 itojun 1630: ipsechdr = ipsec4_hdrsiz(mcopy,
1631: IPSEC_DIR_OUTBOUND,
1632: NULL);
1.89 itojun 1633:
1634: /*
1635: * find the correct route for outer IPv4
1636: * header, compute tunnel MTU.
1637: *
1638: * XXX BUG ALERT
1639: * The "dummyifp" code relies upon the fact
1640: * that icmp_error() touches only ifp->if_mtu.
1641: */
1642: /*XXX*/
1643: destifp = NULL;
1644: if (sp->req != NULL
1.95 itojun 1645: && sp->req->sav != NULL
1646: && sp->req->sav->sah != NULL) {
1647: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1648: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1649: dummyifp.if_mtu =
1650: ro->ro_rt->rt_ifp->if_mtu;
1651: dummyifp.if_mtu -= ipsechdr;
1652: destifp = &dummyifp;
1653: }
1654: }
1655:
1656: key_freesp(sp);
1657: }
1658: }
1659: #endif /*IPSEC*/
1.1 cgd 1660: ipstat.ips_cantfrag++;
1661: break;
1662:
1663: case ENOBUFS:
1664: type = ICMP_SOURCEQUENCH;
1665: code = 0;
1666: break;
1667: }
1.13 mycroft 1668: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1669: }
1670:
1671: void
1672: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1673: struct inpcb *inp;
1674: struct mbuf **mp;
1675: struct ip *ip;
1676: struct mbuf *m;
1.44 thorpej 1677: {
1678:
1679: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1680: struct timeval tv;
1681:
1682: microtime(&tv);
1683: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1684: SCM_TIMESTAMP, SOL_SOCKET);
1685: if (*mp)
1686: mp = &(*mp)->m_next;
1687: }
1688: if (inp->inp_flags & INP_RECVDSTADDR) {
1689: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1690: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1691: if (*mp)
1692: mp = &(*mp)->m_next;
1693: }
1694: #ifdef notyet
1695: /*
1696: * XXX
1697: * Moving these out of udp_input() made them even more broken
1698: * than they already were.
1699: * - fenner@parc.xerox.com
1700: */
1701: /* options were tossed already */
1702: if (inp->inp_flags & INP_RECVOPTS) {
1703: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1704: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1705: if (*mp)
1706: mp = &(*mp)->m_next;
1707: }
1708: /* ip_srcroute doesn't do what we want here, need to fix */
1709: if (inp->inp_flags & INP_RECVRETOPTS) {
1710: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1711: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1712: if (*mp)
1713: mp = &(*mp)->m_next;
1714: }
1715: #endif
1716: if (inp->inp_flags & INP_RECVIF) {
1717: struct sockaddr_dl sdl;
1718:
1719: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1720: sdl.sdl_family = AF_LINK;
1721: sdl.sdl_index = m->m_pkthdr.rcvif ?
1722: m->m_pkthdr.rcvif->if_index : 0;
1723: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1724: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1725: IP_RECVIF, IPPROTO_IP);
1726: if (*mp)
1727: mp = &(*mp)->m_next;
1728: }
1.13 mycroft 1729: }
1730:
1731: int
1732: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1733: int *name;
1734: u_int namelen;
1735: void *oldp;
1736: size_t *oldlenp;
1737: void *newp;
1738: size_t newlen;
1739: {
1.88 sommerfe 1740: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1741:
1.54 lukem 1742: int error, old;
1743:
1.13 mycroft 1744: /* All sysctl names at this level are terminal. */
1745: if (namelen != 1)
1746: return (ENOTDIR);
1747:
1748: switch (name[0]) {
1749: case IPCTL_FORWARDING:
1750: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1751: case IPCTL_SENDREDIRECTS:
1752: return (sysctl_int(oldp, oldlenp, newp, newlen,
1753: &ipsendredirects));
1754: case IPCTL_DEFTTL:
1755: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1756: #ifdef notyet
1757: case IPCTL_DEFMTU:
1758: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1759: #endif
1.26 thorpej 1760: case IPCTL_FORWSRCRT:
1.47 cjs 1761: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1762: if (securelevel > 0)
1.46 cjs 1763: return (sysctl_rdint(oldp, oldlenp, newp,
1764: ip_forwsrcrt));
1765: else
1766: return (sysctl_int(oldp, oldlenp, newp, newlen,
1767: &ip_forwsrcrt));
1.27 thorpej 1768: case IPCTL_DIRECTEDBCAST:
1769: return (sysctl_int(oldp, oldlenp, newp, newlen,
1770: &ip_directedbcast));
1.47 cjs 1771: case IPCTL_ALLOWSRCRT:
1772: return (sysctl_int(oldp, oldlenp, newp, newlen,
1773: &ip_allowsrcrt));
1.52 thorpej 1774: case IPCTL_SUBNETSARELOCAL:
1775: return (sysctl_int(oldp, oldlenp, newp, newlen,
1776: &subnetsarelocal));
1.53 kml 1777: case IPCTL_MTUDISC:
1.60 kml 1778: error = sysctl_int(oldp, oldlenp, newp, newlen,
1779: &ip_mtudisc);
1780: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1781: ip_mtudisc_timeout_q =
1782: rt_timer_queue_create(ip_mtudisc_timeout);
1783: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1784: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1785: ip_mtudisc_timeout_q = NULL;
1786: }
1787: return error;
1.54 lukem 1788: case IPCTL_ANONPORTMIN:
1789: old = anonportmin;
1790: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1791: if (anonportmin >= anonportmax || anonportmin < 0
1792: || anonportmin > 65535
1.54 lukem 1793: #ifndef IPNOPRIVPORTS
1794: || anonportmin < IPPORT_RESERVED
1795: #endif
1796: ) {
1797: anonportmin = old;
1798: return (EINVAL);
1799: }
1800: return (error);
1801: case IPCTL_ANONPORTMAX:
1802: old = anonportmax;
1803: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1804: if (anonportmin >= anonportmax || anonportmax < 0
1805: || anonportmax > 65535
1.54 lukem 1806: #ifndef IPNOPRIVPORTS
1807: || anonportmax < IPPORT_RESERVED
1808: #endif
1809: ) {
1810: anonportmax = old;
1811: return (EINVAL);
1812: }
1.60 kml 1813: return (error);
1814: case IPCTL_MTUDISCTIMEOUT:
1815: error = sysctl_int(oldp, oldlenp, newp, newlen,
1816: &ip_mtudisc_timeout);
1817: if (ip_mtudisc_timeout_q != NULL)
1818: rt_timer_queue_change(ip_mtudisc_timeout_q,
1819: ip_mtudisc_timeout);
1.54 lukem 1820: return (error);
1.65 matt 1821: #ifdef GATEWAY
1822: case IPCTL_MAXFLOWS:
1.67 thorpej 1823: {
1824: int s;
1825:
1.65 matt 1826: error = sysctl_int(oldp, oldlenp, newp, newlen,
1827: &ip_maxflows);
1.67 thorpej 1828: s = splsoftnet();
1.65 matt 1829: ipflow_reap(0);
1.67 thorpej 1830: splx(s);
1.65 matt 1831: return (error);
1.67 thorpej 1832: }
1.89 itojun 1833: #endif
1.90 itojun 1834: case IPCTL_HOSTZEROBROADCAST:
1835: return (sysctl_int(oldp, oldlenp, newp, newlen,
1836: &hostzeroisbroadcast));
1.89 itojun 1837: #if NGIF > 0
1838: case IPCTL_GIF_TTL:
1839: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1840: &ip_gif_ttl));
1.117 tron 1841: #endif
1842:
1843: #ifndef IPNOPRIVPORTS
1844: case IPCTL_LOWPORTMIN:
1845: old = lowportmin;
1846: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1847: if (lowportmin >= lowportmax
1848: || lowportmin > IPPORT_RESERVEDMAX
1849: || lowportmin < IPPORT_RESERVEDMIN
1850: ) {
1851: lowportmin = old;
1852: return (EINVAL);
1853: }
1854: return (error);
1855: case IPCTL_LOWPORTMAX:
1856: old = lowportmax;
1857: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1858: if (lowportmin >= lowportmax
1859: || lowportmax > IPPORT_RESERVEDMAX
1860: || lowportmax < IPPORT_RESERVEDMIN
1861: ) {
1862: lowportmax = old;
1863: return (EINVAL);
1864: }
1865: return (error);
1.65 matt 1866: #endif
1.131 itojun 1867:
1868: case IPCTL_MAXFRAGPACKETS:
1869: return (sysctl_int(oldp, oldlenp, newp, newlen,
1870: &ip_maxfragpackets));
1.88 sommerfe 1871:
1.13 mycroft 1872: default:
1873: return (EOPNOTSUPP);
1874: }
1875: /* NOTREACHED */
1.1 cgd 1876: }
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