Annotation of src/sys/netinet/ip_input.c, Revision 1.146
1.146 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.145 2002/02/25 02:17:55 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: */
1.141 lukem 103:
104: #include <sys/cdefs.h>
1.146 ! thorpej 105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.145 2002/02/25 02:17:55 itojun Exp $");
1.55 scottr 106:
1.62 matt 107: #include "opt_gateway.h"
1.69 mrg 108: #include "opt_pfil_hooks.h"
1.91 thorpej 109: #include "opt_ipsec.h"
1.55 scottr 110: #include "opt_mrouting.h"
1.135 thorpej 111: #include "opt_inet_csum.h"
1.1 cgd 112:
1.5 mycroft 113: #include <sys/param.h>
114: #include <sys/systm.h>
115: #include <sys/malloc.h>
116: #include <sys/mbuf.h>
117: #include <sys/domain.h>
118: #include <sys/protosw.h>
119: #include <sys/socket.h>
1.44 thorpej 120: #include <sys/socketvar.h>
1.5 mycroft 121: #include <sys/errno.h>
122: #include <sys/time.h>
123: #include <sys/kernel.h>
1.72 thorpej 124: #include <sys/pool.h>
1.28 christos 125: #include <sys/sysctl.h>
1.1 cgd 126:
1.5 mycroft 127: #include <net/if.h>
1.44 thorpej 128: #include <net/if_dl.h>
1.5 mycroft 129: #include <net/route.h>
1.45 mrg 130: #include <net/pfil.h>
1.1 cgd 131:
1.5 mycroft 132: #include <netinet/in.h>
133: #include <netinet/in_systm.h>
134: #include <netinet/ip.h>
135: #include <netinet/in_pcb.h>
136: #include <netinet/in_var.h>
137: #include <netinet/ip_var.h>
138: #include <netinet/ip_icmp.h>
1.89 itojun 139: /* just for gif_ttl */
140: #include <netinet/in_gif.h>
141: #include "gif.h"
1.144 martin 142: #include <net/if_gre.h>
143: #include "gre.h"
1.111 jdolecek 144:
145: #ifdef MROUTING
146: #include <netinet/ip_mroute.h>
147: #endif
1.89 itojun 148:
149: #ifdef IPSEC
150: #include <netinet6/ipsec.h>
151: #include <netkey/key.h>
152: #endif
1.44 thorpej 153:
1.1 cgd 154: #ifndef IPFORWARDING
155: #ifdef GATEWAY
156: #define IPFORWARDING 1 /* forward IP packets not for us */
157: #else /* GATEWAY */
158: #define IPFORWARDING 0 /* don't forward IP packets not for us */
159: #endif /* GATEWAY */
160: #endif /* IPFORWARDING */
161: #ifndef IPSENDREDIRECTS
162: #define IPSENDREDIRECTS 1
163: #endif
1.26 thorpej 164: #ifndef IPFORWSRCRT
1.47 cjs 165: #define IPFORWSRCRT 1 /* forward source-routed packets */
166: #endif
167: #ifndef IPALLOWSRCRT
1.48 mrg 168: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 169: #endif
1.53 kml 170: #ifndef IPMTUDISC
171: #define IPMTUDISC 0
172: #endif
1.60 kml 173: #ifndef IPMTUDISCTIMEOUT
1.61 kml 174: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 175: #endif
1.53 kml 176:
1.27 thorpej 177: /*
178: * Note: DIRECTED_BROADCAST is handled this way so that previous
179: * configuration using this option will Just Work.
180: */
181: #ifndef IPDIRECTEDBCAST
182: #ifdef DIRECTED_BROADCAST
183: #define IPDIRECTEDBCAST 1
184: #else
185: #define IPDIRECTEDBCAST 0
186: #endif /* DIRECTED_BROADCAST */
187: #endif /* IPDIRECTEDBCAST */
1.1 cgd 188: int ipforwarding = IPFORWARDING;
189: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 190: int ip_defttl = IPDEFTTL;
1.26 thorpej 191: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 192: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 193: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 194: int ip_mtudisc = IPMTUDISC;
1.60 kml 195: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 196: #ifdef DIAGNOSTIC
197: int ipprintfs = 0;
198: #endif
199:
1.60 kml 200: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
201:
1.1 cgd 202: extern struct domain inetdomain;
203: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 204: struct in_ifaddrhead in_ifaddr;
1.57 tls 205: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 206: struct ifqueue ipintrq;
1.63 matt 207: struct ipstat ipstat;
208: u_int16_t ip_id;
1.75 thorpej 209:
1.121 thorpej 210: #ifdef PFIL_HOOKS
211: struct pfil_head inet_pfil_hook;
212: #endif
213:
1.63 matt 214: struct ipqhead ipq;
1.75 thorpej 215: int ipq_locked;
1.131 itojun 216: int ip_nfragpackets = 0;
1.133 itojun 217: int ip_maxfragpackets = 200;
1.75 thorpej 218:
219: static __inline int ipq_lock_try __P((void));
220: static __inline void ipq_unlock __P((void));
221:
222: static __inline int
223: ipq_lock_try()
224: {
225: int s;
226:
1.132 thorpej 227: /*
228: * Use splvm() -- we're bloking things that would cause
229: * mbuf allocation.
230: */
231: s = splvm();
1.75 thorpej 232: if (ipq_locked) {
233: splx(s);
234: return (0);
235: }
236: ipq_locked = 1;
237: splx(s);
238: return (1);
239: }
240:
241: static __inline void
242: ipq_unlock()
243: {
244: int s;
245:
1.132 thorpej 246: s = splvm();
1.75 thorpej 247: ipq_locked = 0;
248: splx(s);
249: }
250:
251: #ifdef DIAGNOSTIC
252: #define IPQ_LOCK() \
253: do { \
254: if (ipq_lock_try() == 0) { \
255: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
256: panic("ipq_lock"); \
257: } \
258: } while (0)
259: #define IPQ_LOCK_CHECK() \
260: do { \
261: if (ipq_locked == 0) { \
262: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
263: panic("ipq lock check"); \
264: } \
265: } while (0)
266: #else
267: #define IPQ_LOCK() (void) ipq_lock_try()
268: #define IPQ_LOCK_CHECK() /* nothing */
269: #endif
270:
271: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 272:
1.72 thorpej 273: struct pool ipqent_pool;
274:
1.135 thorpej 275: #ifdef INET_CSUM_COUNTERS
276: #include <sys/device.h>
277:
278: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
279: NULL, "inet", "hwcsum bad");
280: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
281: NULL, "inet", "hwcsum ok");
282: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
283: NULL, "inet", "swcsum");
284:
285: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
286:
287: #else
288:
289: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
290:
291: #endif /* INET_CSUM_COUNTERS */
292:
1.1 cgd 293: /*
294: * We need to save the IP options in case a protocol wants to respond
295: * to an incoming packet over the same route if the packet got here
296: * using IP source routing. This allows connection establishment and
297: * maintenance when the remote end is on a network that is not known
298: * to us.
299: */
300: int ip_nhops = 0;
301: static struct ip_srcrt {
302: struct in_addr dst; /* final destination */
303: char nop; /* one NOP to align */
304: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
305: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
306: } ip_srcrt;
307:
1.13 mycroft 308: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 309:
1.1 cgd 310: /*
311: * IP initialization: fill in IP protocol switch table.
312: * All protocols not implemented in kernel go to raw IP protocol handler.
313: */
1.8 mycroft 314: void
1.1 cgd 315: ip_init()
316: {
1.109 augustss 317: struct protosw *pr;
318: int i;
1.1 cgd 319:
1.72 thorpej 320: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146 ! thorpej 321: NULL);
1.72 thorpej 322:
1.1 cgd 323: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
324: if (pr == 0)
325: panic("ip_init");
326: for (i = 0; i < IPPROTO_MAX; i++)
327: ip_protox[i] = pr - inetsw;
328: for (pr = inetdomain.dom_protosw;
329: pr < inetdomain.dom_protoswNPROTOSW; pr++)
330: if (pr->pr_domain->dom_family == PF_INET &&
331: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
332: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 333: LIST_INIT(&ipq);
1.1 cgd 334: ip_id = time.tv_sec & 0xffff;
335: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 336: TAILQ_INIT(&in_ifaddr);
1.120 ad 337: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
338: M_WAITOK, &in_ifaddrhash);
1.60 kml 339: if (ip_mtudisc != 0)
340: ip_mtudisc_timeout_q =
341: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 342: #ifdef GATEWAY
343: ipflow_init();
344: #endif
1.121 thorpej 345:
346: #ifdef PFIL_HOOKS
347: /* Register our Packet Filter hook. */
1.126 thorpej 348: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
349: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 350: i = pfil_head_register(&inet_pfil_hook);
351: if (i != 0)
352: printf("ip_init: WARNING: unable to register pfil hook, "
353: "error %d\n", i);
354: #endif /* PFIL_HOOKS */
1.135 thorpej 355:
356: #ifdef INET_CSUM_COUNTERS
357: evcnt_attach_static(&ip_hwcsum_bad);
358: evcnt_attach_static(&ip_hwcsum_ok);
359: evcnt_attach_static(&ip_swcsum);
360: #endif /* INET_CSUM_COUNTERS */
1.1 cgd 361: }
362:
363: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
364: struct route ipforward_rt;
365:
366: /*
1.89 itojun 367: * IP software interrupt routine
368: */
369: void
370: ipintr()
371: {
372: int s;
373: struct mbuf *m;
374:
375: while (1) {
1.132 thorpej 376: s = splnet();
1.89 itojun 377: IF_DEQUEUE(&ipintrq, m);
378: splx(s);
379: if (m == 0)
380: return;
381: ip_input(m);
382: }
383: }
384:
385: /*
1.1 cgd 386: * Ip input routine. Checksum and byte swap header. If fragmented
387: * try to reassemble. Process options. Pass to next level.
388: */
1.8 mycroft 389: void
1.89 itojun 390: ip_input(struct mbuf *m)
1.1 cgd 391: {
1.109 augustss 392: struct ip *ip = NULL;
393: struct ipq *fp;
394: struct in_ifaddr *ia;
395: struct ifaddr *ifa;
1.25 cgd 396: struct ipqent *ipqe;
1.89 itojun 397: int hlen = 0, mff, len;
1.100 itojun 398: int downmatch;
1.1 cgd 399:
400: #ifdef DIAGNOSTIC
401: if ((m->m_flags & M_PKTHDR) == 0)
402: panic("ipintr no HDR");
403: #endif
1.89 itojun 404: #ifdef IPSEC
405: /*
406: * should the inner packet be considered authentic?
407: * see comment in ah4_input().
408: */
409: if (m) {
410: m->m_flags &= ~M_AUTHIPHDR;
411: m->m_flags &= ~M_AUTHIPDGM;
412: }
413: #endif
1.1 cgd 414: /*
415: * If no IP addresses have been set yet but the interfaces
416: * are receiving, can't do anything with incoming packets yet.
417: */
1.140 matt 418: if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1 cgd 419: goto bad;
420: ipstat.ips_total++;
421: if (m->m_len < sizeof (struct ip) &&
422: (m = m_pullup(m, sizeof (struct ip))) == 0) {
423: ipstat.ips_toosmall++;
1.89 itojun 424: return;
1.1 cgd 425: }
426: ip = mtod(m, struct ip *);
1.13 mycroft 427: if (ip->ip_v != IPVERSION) {
428: ipstat.ips_badvers++;
429: goto bad;
430: }
1.1 cgd 431: hlen = ip->ip_hl << 2;
432: if (hlen < sizeof(struct ip)) { /* minimum header length */
433: ipstat.ips_badhlen++;
434: goto bad;
435: }
436: if (hlen > m->m_len) {
437: if ((m = m_pullup(m, hlen)) == 0) {
438: ipstat.ips_badhlen++;
1.89 itojun 439: return;
1.1 cgd 440: }
441: ip = mtod(m, struct ip *);
442: }
1.98 thorpej 443:
1.85 hwr 444: /*
1.99 thorpej 445: * RFC1122: packets with a multicast source address are
1.98 thorpej 446: * not allowed.
1.85 hwr 447: */
448: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 449: ipstat.ips_badaddr++;
1.85 hwr 450: goto bad;
1.129 itojun 451: }
452:
453: /* 127/8 must not appear on wire - RFC1122 */
454: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
455: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 456: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
457: ipstat.ips_badaddr++;
1.129 itojun 458: goto bad;
1.130 itojun 459: }
1.85 hwr 460: }
461:
1.135 thorpej 462: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 463: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 464: M_CSUM_IPv4_BAD)) {
465: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
466: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
467: goto badcsum;
468:
469: case M_CSUM_IPv4:
470: /* Checksum was okay. */
471: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
472: break;
473:
474: default:
475: /* Must compute it ourselves. */
476: INET_CSUM_COUNTER_INCR(&ip_swcsum);
477: if (in_cksum(m, hlen) != 0)
478: goto bad;
479: break;
1.1 cgd 480: }
481:
1.121 thorpej 482: /* Retrieve the packet length. */
483: len = ntohs(ip->ip_len);
1.81 proff 484:
485: /*
486: * Check for additional length bogosity
487: */
1.84 proff 488: if (len < hlen) {
1.81 proff 489: ipstat.ips_badlen++;
490: goto bad;
491: }
1.1 cgd 492:
493: /*
494: * Check that the amount of data in the buffers
495: * is as at least much as the IP header would have us expect.
496: * Trim mbufs if longer than we expect.
497: * Drop packet if shorter than we expect.
498: */
1.35 mycroft 499: if (m->m_pkthdr.len < len) {
1.1 cgd 500: ipstat.ips_tooshort++;
501: goto bad;
502: }
1.35 mycroft 503: if (m->m_pkthdr.len > len) {
1.1 cgd 504: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 505: m->m_len = len;
506: m->m_pkthdr.len = len;
1.1 cgd 507: } else
1.35 mycroft 508: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 509: }
510:
1.94 itojun 511: #ifdef IPSEC
512: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
513: m->m_flags &= ~M_CANFASTFWD;
514: #else
1.64 thorpej 515: /*
516: * Assume that we can create a fast-forward IP flow entry
517: * based on this packet.
518: */
519: m->m_flags |= M_CANFASTFWD;
1.94 itojun 520: #endif
1.64 thorpej 521:
1.36 mrg 522: #ifdef PFIL_HOOKS
1.33 mrg 523: /*
1.64 thorpej 524: * Run through list of hooks for input packets. If there are any
525: * filters which require that additional packets in the flow are
526: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
527: * Note that filters must _never_ set this flag, as another filter
528: * in the list may have previously cleared it.
1.33 mrg 529: */
1.127 itojun 530: /*
531: * let ipfilter look at packet on the wire,
532: * not the decapsulated packet.
533: */
534: #ifdef IPSEC
1.136 itojun 535: if (!ipsec_getnhist(m))
1.127 itojun 536: #else
537: if (1)
538: #endif
539: {
540: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
541: PFIL_IN) != 0)
1.121 thorpej 542: return;
1.127 itojun 543: if (m == NULL)
544: return;
545: ip = mtod(m, struct ip *);
1.142 darrenr 546: hlen = ip->ip_hl << 2;
1.127 itojun 547: }
1.36 mrg 548: #endif /* PFIL_HOOKS */
1.123 thorpej 549:
550: #ifdef ALTQ
551: /* XXX Temporary until ALTQ is changed to use a pfil hook */
552: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
553: /* packet dropped by traffic conditioner */
554: return;
555: }
556: #endif
1.121 thorpej 557:
558: /*
559: * Convert fields to host representation.
560: */
561: NTOHS(ip->ip_len);
562: NTOHS(ip->ip_off);
1.33 mrg 563:
1.1 cgd 564: /*
565: * Process options and, if not destined for us,
566: * ship it on. ip_dooptions returns 1 when an
567: * error was detected (causing an icmp message
568: * to be sent and the original packet to be freed).
569: */
570: ip_nhops = 0; /* for source routed packets */
571: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 572: return;
1.1 cgd 573:
574: /*
575: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 576: *
577: * Traditional 4.4BSD did not consult IFF_UP at all.
578: * The behavior here is to treat addresses on !IFF_UP interface
579: * as not mine.
1.1 cgd 580: */
1.100 itojun 581: downmatch = 0;
1.140 matt 582: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 583: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
584: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
585: break;
1.100 itojun 586: else
587: downmatch++;
1.97 itojun 588: }
589: }
1.86 thorpej 590: if (ia != NULL)
591: goto ours;
1.57 tls 592: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140 matt 593: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
594: if (ifa->ifa_addr->sa_family != AF_INET)
595: continue;
1.57 tls 596: ia = ifatoia(ifa);
1.35 mycroft 597: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
598: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 599: /*
600: * Look for all-0's host part (old broadcast addr),
601: * either for subnet or net.
602: */
603: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 604: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 605: goto ours;
1.57 tls 606: /*
607: * An interface with IP address zero accepts
608: * all packets that arrive on that interface.
609: */
610: if (in_nullhost(ia->ia_addr.sin_addr))
611: goto ours;
1.1 cgd 612: }
613: }
1.18 mycroft 614: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 615: struct in_multi *inm;
616: #ifdef MROUTING
617: extern struct socket *ip_mrouter;
1.10 brezak 618:
619: if (m->m_flags & M_EXT) {
620: if ((m = m_pullup(m, hlen)) == 0) {
621: ipstat.ips_toosmall++;
1.89 itojun 622: return;
1.10 brezak 623: }
624: ip = mtod(m, struct ip *);
625: }
1.4 hpeyerl 626:
627: if (ip_mrouter) {
628: /*
629: * If we are acting as a multicast router, all
630: * incoming multicast packets are passed to the
631: * kernel-level multicast forwarding function.
632: * The packet is returned (relatively) intact; if
633: * ip_mforward() returns a non-zero value, the packet
634: * must be discarded, else it may be accepted below.
635: *
636: * (The IP ident field is put in the same byte order
637: * as expected when ip_mforward() is called from
638: * ip_output().)
639: */
1.13 mycroft 640: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
641: ipstat.ips_cantforward++;
1.4 hpeyerl 642: m_freem(m);
1.89 itojun 643: return;
1.4 hpeyerl 644: }
645:
646: /*
647: * The process-level routing demon needs to receive
648: * all multicast IGMP packets, whether or not this
649: * host belongs to their destination groups.
650: */
651: if (ip->ip_p == IPPROTO_IGMP)
652: goto ours;
1.13 mycroft 653: ipstat.ips_forward++;
1.4 hpeyerl 654: }
655: #endif
656: /*
657: * See if we belong to the destination multicast group on the
658: * arrival interface.
659: */
660: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
661: if (inm == NULL) {
1.13 mycroft 662: ipstat.ips_cantforward++;
1.4 hpeyerl 663: m_freem(m);
1.89 itojun 664: return;
1.4 hpeyerl 665: }
666: goto ours;
667: }
1.19 mycroft 668: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 669: in_nullhost(ip->ip_dst))
1.1 cgd 670: goto ours;
671:
672: /*
673: * Not for us; forward if possible and desirable.
674: */
675: if (ipforwarding == 0) {
676: ipstat.ips_cantforward++;
677: m_freem(m);
1.100 itojun 678: } else {
679: /*
680: * If ip_dst matched any of my address on !IFF_UP interface,
681: * and there's no IFF_UP interface that matches ip_dst,
682: * send icmp unreach. Forwarding it will result in in-kernel
683: * forwarding loop till TTL goes to 0.
684: */
685: if (downmatch) {
686: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
687: ipstat.ips_cantforward++;
688: return;
689: }
1.145 itojun 690: #ifdef IPSEC
691: if (ipsec4_in_reject(m, NULL)) {
692: ipsecstat.in_polvio++;
693: goto bad;
694: }
695: #endif
696:
1.1 cgd 697: ip_forward(m, 0);
1.100 itojun 698: }
1.89 itojun 699: return;
1.1 cgd 700:
701: ours:
702: /*
703: * If offset or IP_MF are set, must reassemble.
704: * Otherwise, nothing need be done.
705: * (We could look in the reassembly queue to see
706: * if the packet was previously fragmented,
707: * but it's not worth the time; just let them time out.)
708: */
1.37 perry 709: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 710: /*
711: * Look for queue of fragments
712: * of this datagram.
713: */
1.75 thorpej 714: IPQ_LOCK();
1.140 matt 715: LIST_FOREACH(fp, &ipq, ipq_q)
1.1 cgd 716: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 717: in_hosteq(ip->ip_src, fp->ipq_src) &&
718: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 719: ip->ip_p == fp->ipq_p)
720: goto found;
721: fp = 0;
722: found:
723:
724: /*
725: * Adjust ip_len to not reflect header,
1.25 cgd 726: * set ipqe_mff if more fragments are expected,
1.1 cgd 727: * convert offset of this to bytes.
728: */
729: ip->ip_len -= hlen;
1.25 cgd 730: mff = (ip->ip_off & IP_MF) != 0;
731: if (mff) {
1.16 cgd 732: /*
733: * Make sure that fragments have a data length
734: * that's a non-zero multiple of 8 bytes.
735: */
1.17 cgd 736: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 737: ipstat.ips_badfrags++;
1.75 thorpej 738: IPQ_UNLOCK();
1.16 cgd 739: goto bad;
740: }
741: }
1.1 cgd 742: ip->ip_off <<= 3;
743:
744: /*
745: * If datagram marked as having more fragments
746: * or if this is not the first fragment,
747: * attempt reassembly; if it succeeds, proceed.
748: */
1.25 cgd 749: if (mff || ip->ip_off) {
1.1 cgd 750: ipstat.ips_fragments++;
1.72 thorpej 751: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 752: if (ipqe == NULL) {
753: ipstat.ips_rcvmemdrop++;
1.75 thorpej 754: IPQ_UNLOCK();
1.25 cgd 755: goto bad;
756: }
757: ipqe->ipqe_mff = mff;
1.50 thorpej 758: ipqe->ipqe_m = m;
1.25 cgd 759: ipqe->ipqe_ip = ip;
1.50 thorpej 760: m = ip_reass(ipqe, fp);
1.75 thorpej 761: if (m == 0) {
762: IPQ_UNLOCK();
1.89 itojun 763: return;
1.75 thorpej 764: }
1.13 mycroft 765: ipstat.ips_reassembled++;
1.50 thorpej 766: ip = mtod(m, struct ip *);
1.74 thorpej 767: hlen = ip->ip_hl << 2;
1.79 mycroft 768: ip->ip_len += hlen;
1.1 cgd 769: } else
770: if (fp)
771: ip_freef(fp);
1.75 thorpej 772: IPQ_UNLOCK();
1.79 mycroft 773: }
1.128 itojun 774:
775: #ifdef IPSEC
776: /*
777: * enforce IPsec policy checking if we are seeing last header.
778: * note that we do not visit this with protocols with pcb layer
779: * code - like udp/tcp/raw ip.
780: */
781: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
782: ipsec4_in_reject(m, NULL)) {
783: ipsecstat.in_polvio++;
784: goto bad;
785: }
786: #endif
1.1 cgd 787:
788: /*
789: * Switch out to protocol's input routine.
790: */
1.82 aidan 791: #if IFA_STATS
1.122 itojun 792: if (ia && ip)
793: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 794: #endif
1.1 cgd 795: ipstat.ips_delivered++;
1.89 itojun 796: {
797: int off = hlen, nh = ip->ip_p;
798:
799: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
800: return;
801: }
1.1 cgd 802: bad:
803: m_freem(m);
1.135 thorpej 804: return;
805:
806: badcsum:
807: ipstat.ips_badsum++;
808: m_freem(m);
1.1 cgd 809: }
810:
811: /*
812: * Take incoming datagram fragment and try to
813: * reassemble it into whole datagram. If a chain for
814: * reassembly of this datagram already exists, then it
815: * is given as fp; otherwise have to make a chain.
816: */
1.50 thorpej 817: struct mbuf *
1.25 cgd 818: ip_reass(ipqe, fp)
1.109 augustss 819: struct ipqent *ipqe;
820: struct ipq *fp;
1.1 cgd 821: {
1.109 augustss 822: struct mbuf *m = ipqe->ipqe_m;
823: struct ipqent *nq, *p, *q;
1.25 cgd 824: struct ip *ip;
1.1 cgd 825: struct mbuf *t;
1.25 cgd 826: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 827: int i, next;
828:
1.75 thorpej 829: IPQ_LOCK_CHECK();
830:
1.1 cgd 831: /*
832: * Presence of header sizes in mbufs
833: * would confuse code below.
834: */
835: m->m_data += hlen;
836: m->m_len -= hlen;
837:
838: /*
839: * If first fragment to arrive, create a reassembly queue.
840: */
841: if (fp == 0) {
1.131 itojun 842: /*
843: * Enforce upper bound on number of fragmented packets
844: * for which we attempt reassembly;
845: * If maxfrag is 0, never accept fragments.
846: * If maxfrag is -1, accept all fragments without limitation.
847: */
848: if (ip_maxfragpackets < 0)
849: ;
850: else if (ip_nfragpackets >= ip_maxfragpackets)
851: goto dropfrag;
852: ip_nfragpackets++;
1.50 thorpej 853: MALLOC(fp, struct ipq *, sizeof (struct ipq),
854: M_FTABLE, M_NOWAIT);
855: if (fp == NULL)
1.1 cgd 856: goto dropfrag;
1.25 cgd 857: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 858: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 859: fp->ipq_p = ipqe->ipqe_ip->ip_p;
860: fp->ipq_id = ipqe->ipqe_ip->ip_id;
861: LIST_INIT(&fp->ipq_fragq);
862: fp->ipq_src = ipqe->ipqe_ip->ip_src;
863: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
864: p = NULL;
1.1 cgd 865: goto insert;
866: }
867:
868: /*
869: * Find a segment which begins after this one does.
870: */
1.140 matt 871: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
872: p = q, q = LIST_NEXT(q, ipqe_q))
1.25 cgd 873: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 874: break;
875:
876: /*
877: * If there is a preceding segment, it may provide some of
878: * our data already. If so, drop the data from the incoming
879: * segment. If it provides all of our data, drop us.
880: */
1.25 cgd 881: if (p != NULL) {
882: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
883: ipqe->ipqe_ip->ip_off;
1.1 cgd 884: if (i > 0) {
1.25 cgd 885: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 886: goto dropfrag;
1.50 thorpej 887: m_adj(ipqe->ipqe_m, i);
1.25 cgd 888: ipqe->ipqe_ip->ip_off += i;
889: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 890: }
891: }
892:
893: /*
894: * While we overlap succeeding segments trim them or,
895: * if they are completely covered, dequeue them.
896: */
1.25 cgd 897: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
898: q->ipqe_ip->ip_off; q = nq) {
899: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
900: q->ipqe_ip->ip_off;
901: if (i < q->ipqe_ip->ip_len) {
902: q->ipqe_ip->ip_len -= i;
903: q->ipqe_ip->ip_off += i;
1.50 thorpej 904: m_adj(q->ipqe_m, i);
1.1 cgd 905: break;
906: }
1.140 matt 907: nq = LIST_NEXT(q, ipqe_q);
1.50 thorpej 908: m_freem(q->ipqe_m);
1.25 cgd 909: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 910: pool_put(&ipqent_pool, q);
1.1 cgd 911: }
912:
913: insert:
914: /*
915: * Stick new segment in its place;
916: * check for complete reassembly.
917: */
1.25 cgd 918: if (p == NULL) {
919: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
920: } else {
921: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
922: }
1.1 cgd 923: next = 0;
1.140 matt 924: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
925: p = q, q = LIST_NEXT(q, ipqe_q)) {
1.25 cgd 926: if (q->ipqe_ip->ip_off != next)
1.1 cgd 927: return (0);
1.25 cgd 928: next += q->ipqe_ip->ip_len;
1.1 cgd 929: }
1.25 cgd 930: if (p->ipqe_mff)
1.1 cgd 931: return (0);
932:
933: /*
1.41 thorpej 934: * Reassembly is complete. Check for a bogus message size and
935: * concatenate fragments.
1.1 cgd 936: */
1.140 matt 937: q = LIST_FIRST(&fp->ipq_fragq);
1.25 cgd 938: ip = q->ipqe_ip;
1.41 thorpej 939: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
940: ipstat.ips_toolong++;
941: ip_freef(fp);
942: return (0);
943: }
1.50 thorpej 944: m = q->ipqe_m;
1.1 cgd 945: t = m->m_next;
946: m->m_next = 0;
947: m_cat(m, t);
1.140 matt 948: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 949: pool_put(&ipqent_pool, q);
1.25 cgd 950: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 951: t = q->ipqe_m;
1.140 matt 952: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 953: pool_put(&ipqent_pool, q);
1.1 cgd 954: m_cat(m, t);
955: }
956:
957: /*
958: * Create header for new ip packet by
959: * modifying header of first packet;
960: * dequeue and discard fragment reassembly header.
961: * Make header visible.
962: */
963: ip->ip_len = next;
1.25 cgd 964: ip->ip_src = fp->ipq_src;
965: ip->ip_dst = fp->ipq_dst;
966: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 967: FREE(fp, M_FTABLE);
1.131 itojun 968: ip_nfragpackets--;
1.1 cgd 969: m->m_len += (ip->ip_hl << 2);
970: m->m_data -= (ip->ip_hl << 2);
971: /* some debugging cruft by sklower, below, will go away soon */
972: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 973: int plen = 0;
1.50 thorpej 974: for (t = m; t; t = t->m_next)
975: plen += t->m_len;
976: m->m_pkthdr.len = plen;
1.1 cgd 977: }
1.50 thorpej 978: return (m);
1.1 cgd 979:
980: dropfrag:
981: ipstat.ips_fragdropped++;
982: m_freem(m);
1.72 thorpej 983: pool_put(&ipqent_pool, ipqe);
1.1 cgd 984: return (0);
985: }
986:
987: /*
988: * Free a fragment reassembly header and all
989: * associated datagrams.
990: */
1.8 mycroft 991: void
1.1 cgd 992: ip_freef(fp)
993: struct ipq *fp;
994: {
1.109 augustss 995: struct ipqent *q, *p;
1.1 cgd 996:
1.75 thorpej 997: IPQ_LOCK_CHECK();
998:
1.140 matt 999: for (q = LIST_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1000: p = LIST_NEXT(q, ipqe_q);
1.50 thorpej 1001: m_freem(q->ipqe_m);
1.25 cgd 1002: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 1003: pool_put(&ipqent_pool, q);
1.1 cgd 1004: }
1.25 cgd 1005: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1006: FREE(fp, M_FTABLE);
1.131 itojun 1007: ip_nfragpackets--;
1.1 cgd 1008: }
1009:
1010: /*
1011: * IP timer processing;
1012: * if a timer expires on a reassembly
1013: * queue, discard it.
1014: */
1.8 mycroft 1015: void
1.1 cgd 1016: ip_slowtimo()
1017: {
1.109 augustss 1018: struct ipq *fp, *nfp;
1.24 mycroft 1019: int s = splsoftnet();
1.1 cgd 1020:
1.75 thorpej 1021: IPQ_LOCK();
1.140 matt 1022: for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
1023: nfp = LIST_NEXT(fp, ipq_q);
1.25 cgd 1024: if (--fp->ipq_ttl == 0) {
1.1 cgd 1025: ipstat.ips_fragtimeout++;
1.25 cgd 1026: ip_freef(fp);
1.1 cgd 1027: }
1028: }
1.131 itojun 1029: /*
1030: * If we are over the maximum number of fragments
1031: * (due to the limit being lowered), drain off
1032: * enough to get down to the new limit.
1033: */
1034: if (ip_maxfragpackets < 0)
1035: ;
1036: else {
1.140 matt 1037: while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
1038: ip_freef(LIST_FIRST(&ipq));
1.131 itojun 1039: }
1.75 thorpej 1040: IPQ_UNLOCK();
1.63 matt 1041: #ifdef GATEWAY
1042: ipflow_slowtimo();
1043: #endif
1.1 cgd 1044: splx(s);
1045: }
1046:
1047: /*
1048: * Drain off all datagram fragments.
1049: */
1.8 mycroft 1050: void
1.1 cgd 1051: ip_drain()
1052: {
1053:
1.75 thorpej 1054: /*
1055: * We may be called from a device's interrupt context. If
1056: * the ipq is already busy, just bail out now.
1057: */
1058: if (ipq_lock_try() == 0)
1059: return;
1060:
1.140 matt 1061: while (LIST_FIRST(&ipq) != NULL) {
1.1 cgd 1062: ipstat.ips_fragdropped++;
1.140 matt 1063: ip_freef(LIST_FIRST(&ipq));
1.1 cgd 1064: }
1.75 thorpej 1065:
1066: IPQ_UNLOCK();
1.1 cgd 1067: }
1068:
1069: /*
1070: * Do option processing on a datagram,
1071: * possibly discarding it if bad options are encountered,
1072: * or forwarding it if source-routed.
1073: * Returns 1 if packet has been forwarded/freed,
1074: * 0 if the packet should be processed further.
1075: */
1.8 mycroft 1076: int
1.1 cgd 1077: ip_dooptions(m)
1078: struct mbuf *m;
1079: {
1.109 augustss 1080: struct ip *ip = mtod(m, struct ip *);
1081: u_char *cp, *cp0;
1082: struct ip_timestamp *ipt;
1083: struct in_ifaddr *ia;
1.1 cgd 1084: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1085: struct in_addr dst;
1.1 cgd 1086: n_time ntime;
1087:
1.13 mycroft 1088: dst = ip->ip_dst;
1.1 cgd 1089: cp = (u_char *)(ip + 1);
1090: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1091: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1092: opt = cp[IPOPT_OPTVAL];
1093: if (opt == IPOPT_EOL)
1094: break;
1095: if (opt == IPOPT_NOP)
1096: optlen = 1;
1097: else {
1.113 itojun 1098: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1099: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1100: goto bad;
1101: }
1.1 cgd 1102: optlen = cp[IPOPT_OLEN];
1.114 itojun 1103: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1104: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1105: goto bad;
1106: }
1107: }
1108: switch (opt) {
1109:
1110: default:
1111: break;
1112:
1113: /*
1114: * Source routing with record.
1115: * Find interface with current destination address.
1116: * If none on this machine then drop if strictly routed,
1117: * or do nothing if loosely routed.
1118: * Record interface address and bring up next address
1119: * component. If strictly routed make sure next
1120: * address is on directly accessible net.
1121: */
1122: case IPOPT_LSRR:
1123: case IPOPT_SSRR:
1.47 cjs 1124: if (ip_allowsrcrt == 0) {
1125: type = ICMP_UNREACH;
1126: code = ICMP_UNREACH_NET_PROHIB;
1127: goto bad;
1128: }
1.114 itojun 1129: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1130: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1131: goto bad;
1132: }
1.1 cgd 1133: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1134: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1135: goto bad;
1136: }
1137: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1138: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1139: if (ia == 0) {
1140: if (opt == IPOPT_SSRR) {
1141: type = ICMP_UNREACH;
1142: code = ICMP_UNREACH_SRCFAIL;
1143: goto bad;
1144: }
1145: /*
1146: * Loose routing, and not at next destination
1147: * yet; nothing to do except forward.
1148: */
1149: break;
1150: }
1151: off--; /* 0 origin */
1.112 sommerfe 1152: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1153: /*
1154: * End of source route. Should be for us.
1155: */
1156: save_rte(cp, ip->ip_src);
1157: break;
1158: }
1159: /*
1160: * locate outgoing interface
1161: */
1162: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1163: sizeof(ipaddr.sin_addr));
1.96 thorpej 1164: if (opt == IPOPT_SSRR)
1165: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1166: else
1.1 cgd 1167: ia = ip_rtaddr(ipaddr.sin_addr);
1168: if (ia == 0) {
1169: type = ICMP_UNREACH;
1170: code = ICMP_UNREACH_SRCFAIL;
1171: goto bad;
1172: }
1173: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1174: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1175: (caddr_t)(cp + off), sizeof(struct in_addr));
1176: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1177: /*
1178: * Let ip_intr's mcast routing check handle mcast pkts
1179: */
1.18 mycroft 1180: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1181: break;
1182:
1183: case IPOPT_RR:
1.114 itojun 1184: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1185: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1186: goto bad;
1187: }
1.1 cgd 1188: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1189: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1190: goto bad;
1191: }
1192: /*
1193: * If no space remains, ignore.
1194: */
1195: off--; /* 0 origin */
1.112 sommerfe 1196: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1197: break;
1198: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1199: sizeof(ipaddr.sin_addr));
1200: /*
1201: * locate outgoing interface; if we're the destination,
1202: * use the incoming interface (should be same).
1203: */
1.96 thorpej 1204: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1205: == NULL &&
1206: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1207: type = ICMP_UNREACH;
1208: code = ICMP_UNREACH_HOST;
1209: goto bad;
1210: }
1.20 mycroft 1211: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1212: (caddr_t)(cp + off), sizeof(struct in_addr));
1213: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1214: break;
1215:
1216: case IPOPT_TS:
1217: code = cp - (u_char *)ip;
1218: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1219: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1220: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1221: goto bad;
1.114 itojun 1222: }
1223: if (ipt->ipt_ptr < 5) {
1224: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1225: goto bad;
1226: }
1.15 cgd 1227: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1228: if (++ipt->ipt_oflw == 0) {
1229: code = (u_char *)&ipt->ipt_ptr -
1230: (u_char *)ip;
1.1 cgd 1231: goto bad;
1.114 itojun 1232: }
1.1 cgd 1233: break;
1234: }
1.104 thorpej 1235: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1236: switch (ipt->ipt_flg) {
1237:
1238: case IPOPT_TS_TSONLY:
1239: break;
1240:
1241: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1242: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1243: sizeof(struct in_addr) > ipt->ipt_len) {
1244: code = (u_char *)&ipt->ipt_ptr -
1245: (u_char *)ip;
1.1 cgd 1246: goto bad;
1.114 itojun 1247: }
1.13 mycroft 1248: ipaddr.sin_addr = dst;
1.96 thorpej 1249: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1250: m->m_pkthdr.rcvif));
1.13 mycroft 1251: if (ia == 0)
1252: continue;
1.104 thorpej 1253: bcopy(&ia->ia_addr.sin_addr,
1254: cp0, sizeof(struct in_addr));
1.1 cgd 1255: ipt->ipt_ptr += sizeof(struct in_addr);
1256: break;
1257:
1258: case IPOPT_TS_PRESPEC:
1.66 thorpej 1259: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1260: sizeof(struct in_addr) > ipt->ipt_len) {
1261: code = (u_char *)&ipt->ipt_ptr -
1262: (u_char *)ip;
1.1 cgd 1263: goto bad;
1.114 itojun 1264: }
1.104 thorpej 1265: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1266: sizeof(struct in_addr));
1.96 thorpej 1267: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1268: == NULL)
1.1 cgd 1269: continue;
1270: ipt->ipt_ptr += sizeof(struct in_addr);
1271: break;
1272:
1273: default:
1.114 itojun 1274: /* XXX can't take &ipt->ipt_flg */
1275: code = (u_char *)&ipt->ipt_ptr -
1276: (u_char *)ip + 1;
1.1 cgd 1277: goto bad;
1278: }
1279: ntime = iptime();
1.107 thorpej 1280: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1281: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1282: sizeof(n_time));
1283: ipt->ipt_ptr += sizeof(n_time);
1284: }
1285: }
1286: if (forward) {
1.26 thorpej 1287: if (ip_forwsrcrt == 0) {
1288: type = ICMP_UNREACH;
1289: code = ICMP_UNREACH_SRCFAIL;
1290: goto bad;
1291: }
1.1 cgd 1292: ip_forward(m, 1);
1293: return (1);
1.13 mycroft 1294: }
1295: return (0);
1.1 cgd 1296: bad:
1.13 mycroft 1297: icmp_error(m, type, code, 0, 0);
1298: ipstat.ips_badoptions++;
1.1 cgd 1299: return (1);
1300: }
1301:
1302: /*
1303: * Given address of next destination (final or next hop),
1304: * return internet address info of interface to be used to get there.
1305: */
1306: struct in_ifaddr *
1307: ip_rtaddr(dst)
1308: struct in_addr dst;
1309: {
1.109 augustss 1310: struct sockaddr_in *sin;
1.1 cgd 1311:
1.19 mycroft 1312: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1313:
1.35 mycroft 1314: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1315: if (ipforward_rt.ro_rt) {
1316: RTFREE(ipforward_rt.ro_rt);
1317: ipforward_rt.ro_rt = 0;
1318: }
1319: sin->sin_family = AF_INET;
1320: sin->sin_len = sizeof(*sin);
1321: sin->sin_addr = dst;
1322:
1323: rtalloc(&ipforward_rt);
1324: }
1325: if (ipforward_rt.ro_rt == 0)
1326: return ((struct in_ifaddr *)0);
1.19 mycroft 1327: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1328: }
1329:
1330: /*
1331: * Save incoming source route for use in replies,
1332: * to be picked up later by ip_srcroute if the receiver is interested.
1333: */
1.13 mycroft 1334: void
1.1 cgd 1335: save_rte(option, dst)
1336: u_char *option;
1337: struct in_addr dst;
1338: {
1339: unsigned olen;
1340:
1341: olen = option[IPOPT_OLEN];
1342: #ifdef DIAGNOSTIC
1343: if (ipprintfs)
1.39 christos 1344: printf("save_rte: olen %d\n", olen);
1.89 itojun 1345: #endif /* 0 */
1.1 cgd 1346: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1347: return;
1348: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1349: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1350: ip_srcrt.dst = dst;
1351: }
1352:
1353: /*
1354: * Retrieve incoming source route for use in replies,
1355: * in the same form used by setsockopt.
1356: * The first hop is placed before the options, will be removed later.
1357: */
1358: struct mbuf *
1359: ip_srcroute()
1360: {
1.109 augustss 1361: struct in_addr *p, *q;
1362: struct mbuf *m;
1.1 cgd 1363:
1364: if (ip_nhops == 0)
1365: return ((struct mbuf *)0);
1366: m = m_get(M_DONTWAIT, MT_SOOPTS);
1367: if (m == 0)
1368: return ((struct mbuf *)0);
1369:
1.13 mycroft 1370: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1371:
1372: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1373: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1374: OPTSIZ;
1375: #ifdef DIAGNOSTIC
1376: if (ipprintfs)
1.39 christos 1377: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1378: #endif
1379:
1380: /*
1381: * First save first hop for return route
1382: */
1383: p = &ip_srcrt.route[ip_nhops - 1];
1384: *(mtod(m, struct in_addr *)) = *p--;
1385: #ifdef DIAGNOSTIC
1386: if (ipprintfs)
1.39 christos 1387: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1388: #endif
1389:
1390: /*
1391: * Copy option fields and padding (nop) to mbuf.
1392: */
1393: ip_srcrt.nop = IPOPT_NOP;
1394: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1395: bcopy((caddr_t)&ip_srcrt.nop,
1396: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1397: q = (struct in_addr *)(mtod(m, caddr_t) +
1398: sizeof(struct in_addr) + OPTSIZ);
1399: #undef OPTSIZ
1400: /*
1401: * Record return path as an IP source route,
1402: * reversing the path (pointers are now aligned).
1403: */
1404: while (p >= ip_srcrt.route) {
1405: #ifdef DIAGNOSTIC
1406: if (ipprintfs)
1.39 christos 1407: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1408: #endif
1409: *q++ = *p--;
1410: }
1411: /*
1412: * Last hop goes to final destination.
1413: */
1414: *q = ip_srcrt.dst;
1415: #ifdef DIAGNOSTIC
1416: if (ipprintfs)
1.39 christos 1417: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1418: #endif
1419: return (m);
1420: }
1421:
1422: /*
1423: * Strip out IP options, at higher
1424: * level protocol in the kernel.
1425: * Second argument is buffer to which options
1426: * will be moved, and return value is their length.
1427: * XXX should be deleted; last arg currently ignored.
1428: */
1.8 mycroft 1429: void
1.1 cgd 1430: ip_stripoptions(m, mopt)
1.109 augustss 1431: struct mbuf *m;
1.1 cgd 1432: struct mbuf *mopt;
1433: {
1.109 augustss 1434: int i;
1.1 cgd 1435: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1436: caddr_t opts;
1.1 cgd 1437: int olen;
1438:
1.79 mycroft 1439: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1440: opts = (caddr_t)(ip + 1);
1441: i = m->m_len - (sizeof (struct ip) + olen);
1442: bcopy(opts + olen, opts, (unsigned)i);
1443: m->m_len -= olen;
1444: if (m->m_flags & M_PKTHDR)
1445: m->m_pkthdr.len -= olen;
1.79 mycroft 1446: ip->ip_len -= olen;
1447: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1448: }
1449:
1.139 matt 1450: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1451: 0, 0, 0, 0,
1452: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1453: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1454: EMSGSIZE, EHOSTUNREACH, 0, 0,
1455: 0, 0, 0, 0,
1456: ENOPROTOOPT
1457: };
1458:
1459: /*
1460: * Forward a packet. If some error occurs return the sender
1461: * an icmp packet. Note we can't always generate a meaningful
1462: * icmp message because icmp doesn't have a large enough repertoire
1463: * of codes and types.
1464: *
1465: * If not forwarding, just drop the packet. This could be confusing
1466: * if ipforwarding was zero but some routing protocol was advancing
1467: * us as a gateway to somewhere. However, we must let the routing
1468: * protocol deal with that.
1469: *
1470: * The srcrt parameter indicates whether the packet is being forwarded
1471: * via a source route.
1472: */
1.13 mycroft 1473: void
1.1 cgd 1474: ip_forward(m, srcrt)
1475: struct mbuf *m;
1476: int srcrt;
1477: {
1.109 augustss 1478: struct ip *ip = mtod(m, struct ip *);
1479: struct sockaddr_in *sin;
1480: struct rtentry *rt;
1.28 christos 1481: int error, type = 0, code = 0;
1.1 cgd 1482: struct mbuf *mcopy;
1.13 mycroft 1483: n_long dest;
1484: struct ifnet *destifp;
1.89 itojun 1485: #ifdef IPSEC
1486: struct ifnet dummyifp;
1487: #endif
1.135 thorpej 1488:
1489: /*
1490: * Clear any in-bound checksum flags for this packet.
1491: */
1492: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1493:
1.13 mycroft 1494: dest = 0;
1.1 cgd 1495: #ifdef DIAGNOSTIC
1496: if (ipprintfs)
1.70 thorpej 1497: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1498: ntohl(ip->ip_src.s_addr),
1499: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1500: #endif
1.93 sommerfe 1501: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1502: ipstat.ips_cantforward++;
1503: m_freem(m);
1504: return;
1505: }
1506: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1507: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1508: return;
1509: }
1510: ip->ip_ttl -= IPTTLDEC;
1511:
1.19 mycroft 1512: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1513: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1514: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1515: if (ipforward_rt.ro_rt) {
1516: RTFREE(ipforward_rt.ro_rt);
1517: ipforward_rt.ro_rt = 0;
1518: }
1519: sin->sin_family = AF_INET;
1.35 mycroft 1520: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1521: sin->sin_addr = ip->ip_dst;
1522:
1523: rtalloc(&ipforward_rt);
1524: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1525: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1526: return;
1527: }
1528: rt = ipforward_rt.ro_rt;
1529: }
1530:
1531: /*
1.34 mycroft 1532: * Save at most 68 bytes of the packet in case
1.1 cgd 1533: * we need to generate an ICMP message to the src.
1.119 itojun 1534: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1535: */
1.119 itojun 1536: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1537: if (mcopy)
1538: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1539:
1540: /*
1541: * If forwarding packet using same interface that it came in on,
1542: * perhaps should send a redirect to sender to shortcut a hop.
1543: * Only send redirect if source is sending directly to us,
1544: * and if packet was not source routed (or has any options).
1545: * Also, don't send redirect if forwarding using a default route
1546: * or a route modified by a redirect.
1547: */
1548: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1549: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1550: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1551: ipsendredirects && !srcrt) {
1.19 mycroft 1552: if (rt->rt_ifa &&
1553: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1554: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1555: if (rt->rt_flags & RTF_GATEWAY)
1556: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1557: else
1558: dest = ip->ip_dst.s_addr;
1559: /*
1560: * Router requirements says to only send host
1561: * redirects.
1562: */
1563: type = ICMP_REDIRECT;
1564: code = ICMP_REDIRECT_HOST;
1.1 cgd 1565: #ifdef DIAGNOSTIC
1.77 thorpej 1566: if (ipprintfs)
1567: printf("redirect (%d) to %x\n", code,
1568: (u_int32_t)dest);
1.1 cgd 1569: #endif
1570: }
1571: }
1572:
1.89 itojun 1573: #ifdef IPSEC
1.134 lukem 1574: /* Don't lookup socket in forwarding case */
1.127 itojun 1575: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1576: #endif
1.27 thorpej 1577: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1578: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1579: if (error)
1580: ipstat.ips_cantforward++;
1581: else {
1582: ipstat.ips_forward++;
1583: if (type)
1584: ipstat.ips_redirectsent++;
1585: else {
1.63 matt 1586: if (mcopy) {
1587: #ifdef GATEWAY
1.64 thorpej 1588: if (mcopy->m_flags & M_CANFASTFWD)
1589: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1590: #endif
1.1 cgd 1591: m_freem(mcopy);
1.63 matt 1592: }
1.1 cgd 1593: return;
1594: }
1595: }
1596: if (mcopy == NULL)
1597: return;
1.13 mycroft 1598: destifp = NULL;
1599:
1.1 cgd 1600: switch (error) {
1601:
1602: case 0: /* forwarded, but need redirect */
1603: /* type, code set above */
1604: break;
1605:
1606: case ENETUNREACH: /* shouldn't happen, checked above */
1607: case EHOSTUNREACH:
1608: case ENETDOWN:
1609: case EHOSTDOWN:
1610: default:
1611: type = ICMP_UNREACH;
1612: code = ICMP_UNREACH_HOST;
1613: break;
1614:
1615: case EMSGSIZE:
1616: type = ICMP_UNREACH;
1617: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1618: #ifndef IPSEC
1.13 mycroft 1619: if (ipforward_rt.ro_rt)
1620: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1621: #else
1622: /*
1623: * If the packet is routed over IPsec tunnel, tell the
1624: * originator the tunnel MTU.
1625: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1626: * XXX quickhack!!!
1627: */
1628: if (ipforward_rt.ro_rt) {
1629: struct secpolicy *sp;
1630: int ipsecerror;
1.95 itojun 1631: size_t ipsechdr;
1.89 itojun 1632: struct route *ro;
1633:
1634: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1635: IPSEC_DIR_OUTBOUND,
1636: IP_FORWARDING,
1637: &ipsecerror);
1.89 itojun 1638:
1639: if (sp == NULL)
1640: destifp = ipforward_rt.ro_rt->rt_ifp;
1641: else {
1642: /* count IPsec header size */
1.95 itojun 1643: ipsechdr = ipsec4_hdrsiz(mcopy,
1644: IPSEC_DIR_OUTBOUND,
1645: NULL);
1.89 itojun 1646:
1647: /*
1648: * find the correct route for outer IPv4
1649: * header, compute tunnel MTU.
1650: *
1651: * XXX BUG ALERT
1652: * The "dummyifp" code relies upon the fact
1653: * that icmp_error() touches only ifp->if_mtu.
1654: */
1655: /*XXX*/
1656: destifp = NULL;
1657: if (sp->req != NULL
1.95 itojun 1658: && sp->req->sav != NULL
1659: && sp->req->sav->sah != NULL) {
1660: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1661: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1662: dummyifp.if_mtu =
1663: ro->ro_rt->rt_ifp->if_mtu;
1664: dummyifp.if_mtu -= ipsechdr;
1665: destifp = &dummyifp;
1666: }
1667: }
1668:
1669: key_freesp(sp);
1670: }
1671: }
1672: #endif /*IPSEC*/
1.1 cgd 1673: ipstat.ips_cantfrag++;
1674: break;
1675:
1676: case ENOBUFS:
1.143 itojun 1677: #if 1
1678: /*
1679: * a router should not generate ICMP_SOURCEQUENCH as
1680: * required in RFC1812 Requirements for IP Version 4 Routers.
1681: * source quench could be a big problem under DoS attacks,
1682: * or the underlying interface is rate-limited.
1683: */
1684: if (mcopy)
1685: m_freem(mcopy);
1686: return;
1687: #else
1.1 cgd 1688: type = ICMP_SOURCEQUENCH;
1689: code = 0;
1690: break;
1.143 itojun 1691: #endif
1.1 cgd 1692: }
1.13 mycroft 1693: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1694: }
1695:
1696: void
1697: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1698: struct inpcb *inp;
1699: struct mbuf **mp;
1700: struct ip *ip;
1701: struct mbuf *m;
1.44 thorpej 1702: {
1703:
1704: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1705: struct timeval tv;
1706:
1707: microtime(&tv);
1708: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1709: SCM_TIMESTAMP, SOL_SOCKET);
1710: if (*mp)
1711: mp = &(*mp)->m_next;
1712: }
1713: if (inp->inp_flags & INP_RECVDSTADDR) {
1714: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1715: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1716: if (*mp)
1717: mp = &(*mp)->m_next;
1718: }
1719: #ifdef notyet
1720: /*
1721: * XXX
1722: * Moving these out of udp_input() made them even more broken
1723: * than they already were.
1724: * - fenner@parc.xerox.com
1725: */
1726: /* options were tossed already */
1727: if (inp->inp_flags & INP_RECVOPTS) {
1728: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1729: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1730: if (*mp)
1731: mp = &(*mp)->m_next;
1732: }
1733: /* ip_srcroute doesn't do what we want here, need to fix */
1734: if (inp->inp_flags & INP_RECVRETOPTS) {
1735: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1736: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1737: if (*mp)
1738: mp = &(*mp)->m_next;
1739: }
1740: #endif
1741: if (inp->inp_flags & INP_RECVIF) {
1742: struct sockaddr_dl sdl;
1743:
1744: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1745: sdl.sdl_family = AF_LINK;
1746: sdl.sdl_index = m->m_pkthdr.rcvif ?
1747: m->m_pkthdr.rcvif->if_index : 0;
1748: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1749: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1750: IP_RECVIF, IPPROTO_IP);
1751: if (*mp)
1752: mp = &(*mp)->m_next;
1753: }
1.13 mycroft 1754: }
1755:
1756: int
1757: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1758: int *name;
1759: u_int namelen;
1760: void *oldp;
1761: size_t *oldlenp;
1762: void *newp;
1763: size_t newlen;
1764: {
1.88 sommerfe 1765: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1766:
1.54 lukem 1767: int error, old;
1768:
1.13 mycroft 1769: /* All sysctl names at this level are terminal. */
1770: if (namelen != 1)
1771: return (ENOTDIR);
1772:
1773: switch (name[0]) {
1774: case IPCTL_FORWARDING:
1775: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1776: case IPCTL_SENDREDIRECTS:
1777: return (sysctl_int(oldp, oldlenp, newp, newlen,
1778: &ipsendredirects));
1779: case IPCTL_DEFTTL:
1780: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1781: #ifdef notyet
1782: case IPCTL_DEFMTU:
1783: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1784: #endif
1.26 thorpej 1785: case IPCTL_FORWSRCRT:
1.47 cjs 1786: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1787: if (securelevel > 0)
1.46 cjs 1788: return (sysctl_rdint(oldp, oldlenp, newp,
1789: ip_forwsrcrt));
1790: else
1791: return (sysctl_int(oldp, oldlenp, newp, newlen,
1792: &ip_forwsrcrt));
1.27 thorpej 1793: case IPCTL_DIRECTEDBCAST:
1794: return (sysctl_int(oldp, oldlenp, newp, newlen,
1795: &ip_directedbcast));
1.47 cjs 1796: case IPCTL_ALLOWSRCRT:
1797: return (sysctl_int(oldp, oldlenp, newp, newlen,
1798: &ip_allowsrcrt));
1.52 thorpej 1799: case IPCTL_SUBNETSARELOCAL:
1800: return (sysctl_int(oldp, oldlenp, newp, newlen,
1801: &subnetsarelocal));
1.53 kml 1802: case IPCTL_MTUDISC:
1.60 kml 1803: error = sysctl_int(oldp, oldlenp, newp, newlen,
1804: &ip_mtudisc);
1805: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1806: ip_mtudisc_timeout_q =
1807: rt_timer_queue_create(ip_mtudisc_timeout);
1808: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1809: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1810: ip_mtudisc_timeout_q = NULL;
1811: }
1812: return error;
1.54 lukem 1813: case IPCTL_ANONPORTMIN:
1814: old = anonportmin;
1815: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1816: if (anonportmin >= anonportmax || anonportmin < 0
1817: || anonportmin > 65535
1.54 lukem 1818: #ifndef IPNOPRIVPORTS
1819: || anonportmin < IPPORT_RESERVED
1820: #endif
1821: ) {
1822: anonportmin = old;
1823: return (EINVAL);
1824: }
1825: return (error);
1826: case IPCTL_ANONPORTMAX:
1827: old = anonportmax;
1828: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1829: if (anonportmin >= anonportmax || anonportmax < 0
1830: || anonportmax > 65535
1.54 lukem 1831: #ifndef IPNOPRIVPORTS
1832: || anonportmax < IPPORT_RESERVED
1833: #endif
1834: ) {
1835: anonportmax = old;
1836: return (EINVAL);
1837: }
1.60 kml 1838: return (error);
1839: case IPCTL_MTUDISCTIMEOUT:
1840: error = sysctl_int(oldp, oldlenp, newp, newlen,
1841: &ip_mtudisc_timeout);
1842: if (ip_mtudisc_timeout_q != NULL)
1843: rt_timer_queue_change(ip_mtudisc_timeout_q,
1844: ip_mtudisc_timeout);
1.54 lukem 1845: return (error);
1.65 matt 1846: #ifdef GATEWAY
1847: case IPCTL_MAXFLOWS:
1.67 thorpej 1848: {
1849: int s;
1850:
1.65 matt 1851: error = sysctl_int(oldp, oldlenp, newp, newlen,
1852: &ip_maxflows);
1.67 thorpej 1853: s = splsoftnet();
1.65 matt 1854: ipflow_reap(0);
1.67 thorpej 1855: splx(s);
1.65 matt 1856: return (error);
1.67 thorpej 1857: }
1.89 itojun 1858: #endif
1.90 itojun 1859: case IPCTL_HOSTZEROBROADCAST:
1860: return (sysctl_int(oldp, oldlenp, newp, newlen,
1861: &hostzeroisbroadcast));
1.89 itojun 1862: #if NGIF > 0
1863: case IPCTL_GIF_TTL:
1864: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1865: &ip_gif_ttl));
1.144 martin 1866: #endif
1867:
1868: #if NGRE > 0
1869: case IPCTL_GRE_TTL:
1870: return(sysctl_int(oldp, oldlenp, newp, newlen,
1871: &ip_gre_ttl));
1.117 tron 1872: #endif
1873:
1874: #ifndef IPNOPRIVPORTS
1875: case IPCTL_LOWPORTMIN:
1876: old = lowportmin;
1877: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1878: if (lowportmin >= lowportmax
1879: || lowportmin > IPPORT_RESERVEDMAX
1880: || lowportmin < IPPORT_RESERVEDMIN
1881: ) {
1882: lowportmin = old;
1883: return (EINVAL);
1884: }
1885: return (error);
1886: case IPCTL_LOWPORTMAX:
1887: old = lowportmax;
1888: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1889: if (lowportmin >= lowportmax
1890: || lowportmax > IPPORT_RESERVEDMAX
1891: || lowportmax < IPPORT_RESERVEDMIN
1892: ) {
1893: lowportmax = old;
1894: return (EINVAL);
1895: }
1896: return (error);
1.65 matt 1897: #endif
1.131 itojun 1898:
1899: case IPCTL_MAXFRAGPACKETS:
1900: return (sysctl_int(oldp, oldlenp, newp, newlen,
1901: &ip_maxfragpackets));
1.88 sommerfe 1902:
1.13 mycroft 1903: default:
1904: return (EOPNOTSUPP);
1905: }
1906: /* NOTREACHED */
1.1 cgd 1907: }
CVSweb <webmaster@jp.NetBSD.org>