Annotation of src/sys/netinet/ip_input.c, Revision 1.152
1.152 ! itojun 1: /* $NetBSD: ip_input.c,v 1.151 2002/06/07 13:43:47 itojun Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.152 ! itojun 6: *
1.89 itojun 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.
1.152 ! itojun 18: *
1.89 itojun 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>
1.152 ! itojun 105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.151 2002/06/07 13:43:47 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;
1.150 matt 204: u_long in_ifaddrhash; /* size of hash table - 1 */
205: int in_ifaddrentries; /* total number of addrs */
1.22 mycroft 206: struct in_ifaddrhead in_ifaddr;
1.57 tls 207: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 208: struct ifqueue ipintrq;
1.63 matt 209: struct ipstat ipstat;
210: u_int16_t ip_id;
1.75 thorpej 211:
1.121 thorpej 212: #ifdef PFIL_HOOKS
213: struct pfil_head inet_pfil_hook;
214: #endif
215:
1.63 matt 216: struct ipqhead ipq;
1.75 thorpej 217: int ipq_locked;
1.131 itojun 218: int ip_nfragpackets = 0;
1.133 itojun 219: int ip_maxfragpackets = 200;
1.75 thorpej 220:
221: static __inline int ipq_lock_try __P((void));
222: static __inline void ipq_unlock __P((void));
223:
224: static __inline int
225: ipq_lock_try()
226: {
227: int s;
228:
1.132 thorpej 229: /*
1.149 wiz 230: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 231: * mbuf allocation.
232: */
233: s = splvm();
1.75 thorpej 234: if (ipq_locked) {
235: splx(s);
236: return (0);
237: }
238: ipq_locked = 1;
239: splx(s);
240: return (1);
241: }
242:
243: static __inline void
244: ipq_unlock()
245: {
246: int s;
247:
1.132 thorpej 248: s = splvm();
1.75 thorpej 249: ipq_locked = 0;
250: splx(s);
251: }
252:
253: #ifdef DIAGNOSTIC
254: #define IPQ_LOCK() \
255: do { \
256: if (ipq_lock_try() == 0) { \
257: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
258: panic("ipq_lock"); \
259: } \
260: } while (0)
261: #define IPQ_LOCK_CHECK() \
262: do { \
263: if (ipq_locked == 0) { \
264: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
265: panic("ipq lock check"); \
266: } \
267: } while (0)
268: #else
269: #define IPQ_LOCK() (void) ipq_lock_try()
270: #define IPQ_LOCK_CHECK() /* nothing */
271: #endif
272:
273: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 274:
1.72 thorpej 275: struct pool ipqent_pool;
276:
1.135 thorpej 277: #ifdef INET_CSUM_COUNTERS
278: #include <sys/device.h>
279:
280: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
281: NULL, "inet", "hwcsum bad");
282: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
283: NULL, "inet", "hwcsum ok");
284: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
285: NULL, "inet", "swcsum");
286:
287: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
288:
289: #else
290:
291: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
292:
293: #endif /* INET_CSUM_COUNTERS */
294:
1.1 cgd 295: /*
296: * We need to save the IP options in case a protocol wants to respond
297: * to an incoming packet over the same route if the packet got here
298: * using IP source routing. This allows connection establishment and
299: * maintenance when the remote end is on a network that is not known
300: * to us.
301: */
302: int ip_nhops = 0;
303: static struct ip_srcrt {
304: struct in_addr dst; /* final destination */
305: char nop; /* one NOP to align */
306: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
307: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
308: } ip_srcrt;
309:
1.13 mycroft 310: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 311:
1.1 cgd 312: /*
313: * IP initialization: fill in IP protocol switch table.
314: * All protocols not implemented in kernel go to raw IP protocol handler.
315: */
1.8 mycroft 316: void
1.1 cgd 317: ip_init()
318: {
1.109 augustss 319: struct protosw *pr;
320: int i;
1.1 cgd 321:
1.72 thorpej 322: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146 thorpej 323: NULL);
1.72 thorpej 324:
1.1 cgd 325: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
326: if (pr == 0)
327: panic("ip_init");
328: for (i = 0; i < IPPROTO_MAX; i++)
329: ip_protox[i] = pr - inetsw;
330: for (pr = inetdomain.dom_protosw;
331: pr < inetdomain.dom_protoswNPROTOSW; pr++)
332: if (pr->pr_domain->dom_family == PF_INET &&
333: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
334: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 335: LIST_INIT(&ipq);
1.1 cgd 336: ip_id = time.tv_sec & 0xffff;
337: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 338: TAILQ_INIT(&in_ifaddr);
1.120 ad 339: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
340: M_WAITOK, &in_ifaddrhash);
1.60 kml 341: if (ip_mtudisc != 0)
1.152 ! itojun 342: ip_mtudisc_timeout_q =
1.60 kml 343: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 344: #ifdef GATEWAY
345: ipflow_init();
346: #endif
1.121 thorpej 347:
348: #ifdef PFIL_HOOKS
349: /* Register our Packet Filter hook. */
1.126 thorpej 350: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
351: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 352: i = pfil_head_register(&inet_pfil_hook);
353: if (i != 0)
354: printf("ip_init: WARNING: unable to register pfil hook, "
355: "error %d\n", i);
356: #endif /* PFIL_HOOKS */
1.135 thorpej 357:
358: #ifdef INET_CSUM_COUNTERS
359: evcnt_attach_static(&ip_hwcsum_bad);
360: evcnt_attach_static(&ip_hwcsum_ok);
361: evcnt_attach_static(&ip_swcsum);
362: #endif /* INET_CSUM_COUNTERS */
1.1 cgd 363: }
364:
365: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
366: struct route ipforward_rt;
367:
368: /*
1.89 itojun 369: * IP software interrupt routine
370: */
371: void
372: ipintr()
373: {
374: int s;
375: struct mbuf *m;
376:
377: while (1) {
1.132 thorpej 378: s = splnet();
1.89 itojun 379: IF_DEQUEUE(&ipintrq, m);
380: splx(s);
381: if (m == 0)
382: return;
383: ip_input(m);
384: }
385: }
386:
387: /*
1.1 cgd 388: * Ip input routine. Checksum and byte swap header. If fragmented
389: * try to reassemble. Process options. Pass to next level.
390: */
1.8 mycroft 391: void
1.89 itojun 392: ip_input(struct mbuf *m)
1.1 cgd 393: {
1.109 augustss 394: struct ip *ip = NULL;
395: struct ipq *fp;
396: struct in_ifaddr *ia;
397: struct ifaddr *ifa;
1.25 cgd 398: struct ipqent *ipqe;
1.89 itojun 399: int hlen = 0, mff, len;
1.100 itojun 400: int downmatch;
1.1 cgd 401:
402: #ifdef DIAGNOSTIC
403: if ((m->m_flags & M_PKTHDR) == 0)
404: panic("ipintr no HDR");
405: #endif
1.89 itojun 406: #ifdef IPSEC
407: /*
408: * should the inner packet be considered authentic?
409: * see comment in ah4_input().
410: */
411: if (m) {
412: m->m_flags &= ~M_AUTHIPHDR;
413: m->m_flags &= ~M_AUTHIPDGM;
414: }
415: #endif
1.1 cgd 416: /*
417: * If no IP addresses have been set yet but the interfaces
418: * are receiving, can't do anything with incoming packets yet.
419: */
1.140 matt 420: if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1 cgd 421: goto bad;
422: ipstat.ips_total++;
423: if (m->m_len < sizeof (struct ip) &&
424: (m = m_pullup(m, sizeof (struct ip))) == 0) {
425: ipstat.ips_toosmall++;
1.89 itojun 426: return;
1.1 cgd 427: }
428: ip = mtod(m, struct ip *);
1.13 mycroft 429: if (ip->ip_v != IPVERSION) {
430: ipstat.ips_badvers++;
431: goto bad;
432: }
1.1 cgd 433: hlen = ip->ip_hl << 2;
434: if (hlen < sizeof(struct ip)) { /* minimum header length */
435: ipstat.ips_badhlen++;
436: goto bad;
437: }
438: if (hlen > m->m_len) {
439: if ((m = m_pullup(m, hlen)) == 0) {
440: ipstat.ips_badhlen++;
1.89 itojun 441: return;
1.1 cgd 442: }
443: ip = mtod(m, struct ip *);
444: }
1.98 thorpej 445:
1.85 hwr 446: /*
1.99 thorpej 447: * RFC1122: packets with a multicast source address are
1.98 thorpej 448: * not allowed.
1.85 hwr 449: */
450: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 451: ipstat.ips_badaddr++;
1.85 hwr 452: goto bad;
1.129 itojun 453: }
454:
455: /* 127/8 must not appear on wire - RFC1122 */
456: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
457: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 458: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
459: ipstat.ips_badaddr++;
1.129 itojun 460: goto bad;
1.130 itojun 461: }
1.85 hwr 462: }
463:
1.135 thorpej 464: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 465: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 466: M_CSUM_IPv4_BAD)) {
467: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
468: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
469: goto badcsum;
470:
471: case M_CSUM_IPv4:
472: /* Checksum was okay. */
473: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
474: break;
475:
476: default:
477: /* Must compute it ourselves. */
478: INET_CSUM_COUNTER_INCR(&ip_swcsum);
479: if (in_cksum(m, hlen) != 0)
480: goto bad;
481: break;
1.1 cgd 482: }
483:
1.121 thorpej 484: /* Retrieve the packet length. */
485: len = ntohs(ip->ip_len);
1.81 proff 486:
487: /*
488: * Check for additional length bogosity
489: */
1.84 proff 490: if (len < hlen) {
1.81 proff 491: ipstat.ips_badlen++;
492: goto bad;
493: }
1.1 cgd 494:
495: /*
496: * Check that the amount of data in the buffers
497: * is as at least much as the IP header would have us expect.
498: * Trim mbufs if longer than we expect.
499: * Drop packet if shorter than we expect.
500: */
1.35 mycroft 501: if (m->m_pkthdr.len < len) {
1.1 cgd 502: ipstat.ips_tooshort++;
503: goto bad;
504: }
1.35 mycroft 505: if (m->m_pkthdr.len > len) {
1.1 cgd 506: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 507: m->m_len = len;
508: m->m_pkthdr.len = len;
1.1 cgd 509: } else
1.35 mycroft 510: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 511: }
512:
1.94 itojun 513: #ifdef IPSEC
1.149 wiz 514: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 515: m->m_flags &= ~M_CANFASTFWD;
516: #else
1.64 thorpej 517: /*
518: * Assume that we can create a fast-forward IP flow entry
519: * based on this packet.
520: */
521: m->m_flags |= M_CANFASTFWD;
1.94 itojun 522: #endif
1.64 thorpej 523:
1.36 mrg 524: #ifdef PFIL_HOOKS
1.33 mrg 525: /*
1.64 thorpej 526: * Run through list of hooks for input packets. If there are any
527: * filters which require that additional packets in the flow are
528: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
529: * Note that filters must _never_ set this flag, as another filter
530: * in the list may have previously cleared it.
1.33 mrg 531: */
1.127 itojun 532: /*
533: * let ipfilter look at packet on the wire,
534: * not the decapsulated packet.
535: */
536: #ifdef IPSEC
1.136 itojun 537: if (!ipsec_getnhist(m))
1.127 itojun 538: #else
539: if (1)
540: #endif
541: {
542: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
543: PFIL_IN) != 0)
1.121 thorpej 544: return;
1.127 itojun 545: if (m == NULL)
546: return;
547: ip = mtod(m, struct ip *);
1.142 darrenr 548: hlen = ip->ip_hl << 2;
1.127 itojun 549: }
1.36 mrg 550: #endif /* PFIL_HOOKS */
1.123 thorpej 551:
552: #ifdef ALTQ
553: /* XXX Temporary until ALTQ is changed to use a pfil hook */
554: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
555: /* packet dropped by traffic conditioner */
556: return;
557: }
558: #endif
1.121 thorpej 559:
560: /*
561: * Convert fields to host representation.
562: */
563: NTOHS(ip->ip_len);
564: NTOHS(ip->ip_off);
1.33 mrg 565:
1.1 cgd 566: /*
567: * Process options and, if not destined for us,
568: * ship it on. ip_dooptions returns 1 when an
569: * error was detected (causing an icmp message
570: * to be sent and the original packet to be freed).
571: */
572: ip_nhops = 0; /* for source routed packets */
573: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 574: return;
1.1 cgd 575:
576: /*
577: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 578: *
579: * Traditional 4.4BSD did not consult IFF_UP at all.
580: * The behavior here is to treat addresses on !IFF_UP interface
581: * as not mine.
1.1 cgd 582: */
1.100 itojun 583: downmatch = 0;
1.140 matt 584: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 585: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
586: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
587: break;
1.100 itojun 588: else
589: downmatch++;
1.97 itojun 590: }
591: }
1.86 thorpej 592: if (ia != NULL)
593: goto ours;
1.57 tls 594: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140 matt 595: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
596: if (ifa->ifa_addr->sa_family != AF_INET)
597: continue;
1.57 tls 598: ia = ifatoia(ifa);
1.35 mycroft 599: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
600: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 601: /*
602: * Look for all-0's host part (old broadcast addr),
603: * either for subnet or net.
604: */
605: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 606: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 607: goto ours;
1.57 tls 608: /*
609: * An interface with IP address zero accepts
610: * all packets that arrive on that interface.
611: */
612: if (in_nullhost(ia->ia_addr.sin_addr))
613: goto ours;
1.1 cgd 614: }
615: }
1.18 mycroft 616: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 617: struct in_multi *inm;
618: #ifdef MROUTING
619: extern struct socket *ip_mrouter;
1.10 brezak 620:
1.147 matt 621: if (M_READONLY(m)) {
1.10 brezak 622: if ((m = m_pullup(m, hlen)) == 0) {
623: ipstat.ips_toosmall++;
1.89 itojun 624: return;
1.10 brezak 625: }
626: ip = mtod(m, struct ip *);
627: }
1.4 hpeyerl 628:
629: if (ip_mrouter) {
630: /*
631: * If we are acting as a multicast router, all
632: * incoming multicast packets are passed to the
633: * kernel-level multicast forwarding function.
634: * The packet is returned (relatively) intact; if
635: * ip_mforward() returns a non-zero value, the packet
636: * must be discarded, else it may be accepted below.
637: *
638: * (The IP ident field is put in the same byte order
639: * as expected when ip_mforward() is called from
640: * ip_output().)
641: */
1.13 mycroft 642: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
643: ipstat.ips_cantforward++;
1.4 hpeyerl 644: m_freem(m);
1.89 itojun 645: return;
1.4 hpeyerl 646: }
647:
648: /*
649: * The process-level routing demon needs to receive
650: * all multicast IGMP packets, whether or not this
651: * host belongs to their destination groups.
652: */
653: if (ip->ip_p == IPPROTO_IGMP)
654: goto ours;
1.13 mycroft 655: ipstat.ips_forward++;
1.4 hpeyerl 656: }
657: #endif
658: /*
659: * See if we belong to the destination multicast group on the
660: * arrival interface.
661: */
662: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
663: if (inm == NULL) {
1.13 mycroft 664: ipstat.ips_cantforward++;
1.4 hpeyerl 665: m_freem(m);
1.89 itojun 666: return;
1.4 hpeyerl 667: }
668: goto ours;
669: }
1.19 mycroft 670: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 671: in_nullhost(ip->ip_dst))
1.1 cgd 672: goto ours;
673:
674: /*
675: * Not for us; forward if possible and desirable.
676: */
677: if (ipforwarding == 0) {
678: ipstat.ips_cantforward++;
679: m_freem(m);
1.100 itojun 680: } else {
681: /*
682: * If ip_dst matched any of my address on !IFF_UP interface,
683: * and there's no IFF_UP interface that matches ip_dst,
684: * send icmp unreach. Forwarding it will result in in-kernel
685: * forwarding loop till TTL goes to 0.
686: */
687: if (downmatch) {
688: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
689: ipstat.ips_cantforward++;
690: return;
691: }
1.145 itojun 692: #ifdef IPSEC
693: if (ipsec4_in_reject(m, NULL)) {
694: ipsecstat.in_polvio++;
695: goto bad;
696: }
697: #endif
698:
1.1 cgd 699: ip_forward(m, 0);
1.100 itojun 700: }
1.89 itojun 701: return;
1.1 cgd 702:
703: ours:
704: /*
705: * If offset or IP_MF are set, must reassemble.
706: * Otherwise, nothing need be done.
707: * (We could look in the reassembly queue to see
708: * if the packet was previously fragmented,
709: * but it's not worth the time; just let them time out.)
710: */
1.37 perry 711: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 712: /*
713: * Look for queue of fragments
714: * of this datagram.
715: */
1.75 thorpej 716: IPQ_LOCK();
1.140 matt 717: LIST_FOREACH(fp, &ipq, ipq_q)
1.1 cgd 718: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 719: in_hosteq(ip->ip_src, fp->ipq_src) &&
720: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 721: ip->ip_p == fp->ipq_p)
722: goto found;
723: fp = 0;
724: found:
725:
726: /*
727: * Adjust ip_len to not reflect header,
1.25 cgd 728: * set ipqe_mff if more fragments are expected,
1.1 cgd 729: * convert offset of this to bytes.
730: */
731: ip->ip_len -= hlen;
1.25 cgd 732: mff = (ip->ip_off & IP_MF) != 0;
733: if (mff) {
1.16 cgd 734: /*
735: * Make sure that fragments have a data length
736: * that's a non-zero multiple of 8 bytes.
737: */
1.17 cgd 738: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 739: ipstat.ips_badfrags++;
1.75 thorpej 740: IPQ_UNLOCK();
1.16 cgd 741: goto bad;
742: }
743: }
1.1 cgd 744: ip->ip_off <<= 3;
745:
746: /*
747: * If datagram marked as having more fragments
748: * or if this is not the first fragment,
749: * attempt reassembly; if it succeeds, proceed.
750: */
1.25 cgd 751: if (mff || ip->ip_off) {
1.1 cgd 752: ipstat.ips_fragments++;
1.72 thorpej 753: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 754: if (ipqe == NULL) {
755: ipstat.ips_rcvmemdrop++;
1.75 thorpej 756: IPQ_UNLOCK();
1.25 cgd 757: goto bad;
758: }
759: ipqe->ipqe_mff = mff;
1.50 thorpej 760: ipqe->ipqe_m = m;
1.25 cgd 761: ipqe->ipqe_ip = ip;
1.50 thorpej 762: m = ip_reass(ipqe, fp);
1.75 thorpej 763: if (m == 0) {
764: IPQ_UNLOCK();
1.89 itojun 765: return;
1.75 thorpej 766: }
1.13 mycroft 767: ipstat.ips_reassembled++;
1.50 thorpej 768: ip = mtod(m, struct ip *);
1.74 thorpej 769: hlen = ip->ip_hl << 2;
1.79 mycroft 770: ip->ip_len += hlen;
1.1 cgd 771: } else
772: if (fp)
773: ip_freef(fp);
1.75 thorpej 774: IPQ_UNLOCK();
1.79 mycroft 775: }
1.128 itojun 776:
777: #ifdef IPSEC
778: /*
779: * enforce IPsec policy checking if we are seeing last header.
780: * note that we do not visit this with protocols with pcb layer
781: * code - like udp/tcp/raw ip.
782: */
783: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
784: ipsec4_in_reject(m, NULL)) {
785: ipsecstat.in_polvio++;
786: goto bad;
787: }
788: #endif
1.1 cgd 789:
790: /*
791: * Switch out to protocol's input routine.
792: */
1.82 aidan 793: #if IFA_STATS
1.122 itojun 794: if (ia && ip)
795: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 796: #endif
1.1 cgd 797: ipstat.ips_delivered++;
1.89 itojun 798: {
799: int off = hlen, nh = ip->ip_p;
800:
801: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
802: return;
803: }
1.1 cgd 804: bad:
805: m_freem(m);
1.135 thorpej 806: return;
807:
808: badcsum:
809: ipstat.ips_badsum++;
810: m_freem(m);
1.1 cgd 811: }
812:
813: /*
814: * Take incoming datagram fragment and try to
815: * reassemble it into whole datagram. If a chain for
816: * reassembly of this datagram already exists, then it
817: * is given as fp; otherwise have to make a chain.
818: */
1.50 thorpej 819: struct mbuf *
1.25 cgd 820: ip_reass(ipqe, fp)
1.109 augustss 821: struct ipqent *ipqe;
822: struct ipq *fp;
1.1 cgd 823: {
1.109 augustss 824: struct mbuf *m = ipqe->ipqe_m;
825: struct ipqent *nq, *p, *q;
1.25 cgd 826: struct ip *ip;
1.1 cgd 827: struct mbuf *t;
1.25 cgd 828: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 829: int i, next;
830:
1.75 thorpej 831: IPQ_LOCK_CHECK();
832:
1.1 cgd 833: /*
834: * Presence of header sizes in mbufs
835: * would confuse code below.
836: */
837: m->m_data += hlen;
838: m->m_len -= hlen;
839:
840: /*
841: * If first fragment to arrive, create a reassembly queue.
842: */
843: if (fp == 0) {
1.131 itojun 844: /*
845: * Enforce upper bound on number of fragmented packets
846: * for which we attempt reassembly;
847: * If maxfrag is 0, never accept fragments.
848: * If maxfrag is -1, accept all fragments without limitation.
849: */
850: if (ip_maxfragpackets < 0)
851: ;
852: else if (ip_nfragpackets >= ip_maxfragpackets)
853: goto dropfrag;
854: ip_nfragpackets++;
1.50 thorpej 855: MALLOC(fp, struct ipq *, sizeof (struct ipq),
856: M_FTABLE, M_NOWAIT);
857: if (fp == NULL)
1.1 cgd 858: goto dropfrag;
1.25 cgd 859: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 860: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 861: fp->ipq_p = ipqe->ipqe_ip->ip_p;
862: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 863: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 864: fp->ipq_src = ipqe->ipqe_ip->ip_src;
865: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
866: p = NULL;
1.1 cgd 867: goto insert;
868: }
869:
870: /*
871: * Find a segment which begins after this one does.
872: */
1.148 matt 873: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
874: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.25 cgd 875: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 876: break;
877:
878: /*
879: * If there is a preceding segment, it may provide some of
880: * our data already. If so, drop the data from the incoming
881: * segment. If it provides all of our data, drop us.
882: */
1.25 cgd 883: if (p != NULL) {
884: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
885: ipqe->ipqe_ip->ip_off;
1.1 cgd 886: if (i > 0) {
1.25 cgd 887: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 888: goto dropfrag;
1.50 thorpej 889: m_adj(ipqe->ipqe_m, i);
1.25 cgd 890: ipqe->ipqe_ip->ip_off += i;
891: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 892: }
893: }
894:
895: /*
896: * While we overlap succeeding segments trim them or,
897: * if they are completely covered, dequeue them.
898: */
1.25 cgd 899: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
900: q->ipqe_ip->ip_off; q = nq) {
901: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
902: q->ipqe_ip->ip_off;
903: if (i < q->ipqe_ip->ip_len) {
904: q->ipqe_ip->ip_len -= i;
905: q->ipqe_ip->ip_off += i;
1.50 thorpej 906: m_adj(q->ipqe_m, i);
1.1 cgd 907: break;
908: }
1.148 matt 909: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 910: m_freem(q->ipqe_m);
1.148 matt 911: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 912: pool_put(&ipqent_pool, q);
1.1 cgd 913: }
914:
915: insert:
916: /*
917: * Stick new segment in its place;
918: * check for complete reassembly.
919: */
1.25 cgd 920: if (p == NULL) {
1.148 matt 921: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 922: } else {
1.148 matt 923: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 924: }
1.1 cgd 925: next = 0;
1.148 matt 926: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
927: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.25 cgd 928: if (q->ipqe_ip->ip_off != next)
1.1 cgd 929: return (0);
1.25 cgd 930: next += q->ipqe_ip->ip_len;
1.1 cgd 931: }
1.25 cgd 932: if (p->ipqe_mff)
1.1 cgd 933: return (0);
934:
935: /*
1.41 thorpej 936: * Reassembly is complete. Check for a bogus message size and
937: * concatenate fragments.
1.1 cgd 938: */
1.148 matt 939: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 940: ip = q->ipqe_ip;
1.41 thorpej 941: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
942: ipstat.ips_toolong++;
943: ip_freef(fp);
944: return (0);
945: }
1.50 thorpej 946: m = q->ipqe_m;
1.1 cgd 947: t = m->m_next;
948: m->m_next = 0;
949: m_cat(m, t);
1.148 matt 950: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 951: pool_put(&ipqent_pool, q);
1.25 cgd 952: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 953: t = q->ipqe_m;
1.148 matt 954: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 955: pool_put(&ipqent_pool, q);
1.1 cgd 956: m_cat(m, t);
957: }
958:
959: /*
960: * Create header for new ip packet by
961: * modifying header of first packet;
962: * dequeue and discard fragment reassembly header.
963: * Make header visible.
964: */
965: ip->ip_len = next;
1.25 cgd 966: ip->ip_src = fp->ipq_src;
967: ip->ip_dst = fp->ipq_dst;
968: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 969: FREE(fp, M_FTABLE);
1.131 itojun 970: ip_nfragpackets--;
1.1 cgd 971: m->m_len += (ip->ip_hl << 2);
972: m->m_data -= (ip->ip_hl << 2);
973: /* some debugging cruft by sklower, below, will go away soon */
974: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 975: int plen = 0;
1.50 thorpej 976: for (t = m; t; t = t->m_next)
977: plen += t->m_len;
978: m->m_pkthdr.len = plen;
1.1 cgd 979: }
1.50 thorpej 980: return (m);
1.1 cgd 981:
982: dropfrag:
983: ipstat.ips_fragdropped++;
984: m_freem(m);
1.72 thorpej 985: pool_put(&ipqent_pool, ipqe);
1.1 cgd 986: return (0);
987: }
988:
989: /*
990: * Free a fragment reassembly header and all
991: * associated datagrams.
992: */
1.8 mycroft 993: void
1.1 cgd 994: ip_freef(fp)
995: struct ipq *fp;
996: {
1.109 augustss 997: struct ipqent *q, *p;
1.1 cgd 998:
1.75 thorpej 999: IPQ_LOCK_CHECK();
1000:
1.148 matt 1001: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1002: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1003: m_freem(q->ipqe_m);
1.148 matt 1004: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1005: pool_put(&ipqent_pool, q);
1.1 cgd 1006: }
1.25 cgd 1007: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1008: FREE(fp, M_FTABLE);
1.131 itojun 1009: ip_nfragpackets--;
1.1 cgd 1010: }
1011:
1012: /*
1013: * IP timer processing;
1014: * if a timer expires on a reassembly
1015: * queue, discard it.
1016: */
1.8 mycroft 1017: void
1.1 cgd 1018: ip_slowtimo()
1019: {
1.109 augustss 1020: struct ipq *fp, *nfp;
1.24 mycroft 1021: int s = splsoftnet();
1.1 cgd 1022:
1.75 thorpej 1023: IPQ_LOCK();
1.140 matt 1024: for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
1025: nfp = LIST_NEXT(fp, ipq_q);
1.25 cgd 1026: if (--fp->ipq_ttl == 0) {
1.1 cgd 1027: ipstat.ips_fragtimeout++;
1.25 cgd 1028: ip_freef(fp);
1.1 cgd 1029: }
1030: }
1.131 itojun 1031: /*
1032: * If we are over the maximum number of fragments
1033: * (due to the limit being lowered), drain off
1034: * enough to get down to the new limit.
1035: */
1036: if (ip_maxfragpackets < 0)
1037: ;
1038: else {
1.140 matt 1039: while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
1040: ip_freef(LIST_FIRST(&ipq));
1.131 itojun 1041: }
1.75 thorpej 1042: IPQ_UNLOCK();
1.63 matt 1043: #ifdef GATEWAY
1044: ipflow_slowtimo();
1045: #endif
1.1 cgd 1046: splx(s);
1047: }
1048:
1049: /*
1050: * Drain off all datagram fragments.
1051: */
1.8 mycroft 1052: void
1.1 cgd 1053: ip_drain()
1054: {
1055:
1.75 thorpej 1056: /*
1057: * We may be called from a device's interrupt context. If
1058: * the ipq is already busy, just bail out now.
1059: */
1060: if (ipq_lock_try() == 0)
1061: return;
1062:
1.140 matt 1063: while (LIST_FIRST(&ipq) != NULL) {
1.1 cgd 1064: ipstat.ips_fragdropped++;
1.140 matt 1065: ip_freef(LIST_FIRST(&ipq));
1.1 cgd 1066: }
1.75 thorpej 1067:
1068: IPQ_UNLOCK();
1.1 cgd 1069: }
1070:
1071: /*
1072: * Do option processing on a datagram,
1073: * possibly discarding it if bad options are encountered,
1074: * or forwarding it if source-routed.
1075: * Returns 1 if packet has been forwarded/freed,
1076: * 0 if the packet should be processed further.
1077: */
1.8 mycroft 1078: int
1.1 cgd 1079: ip_dooptions(m)
1080: struct mbuf *m;
1081: {
1.109 augustss 1082: struct ip *ip = mtod(m, struct ip *);
1083: u_char *cp, *cp0;
1084: struct ip_timestamp *ipt;
1085: struct in_ifaddr *ia;
1.1 cgd 1086: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1087: struct in_addr dst;
1.1 cgd 1088: n_time ntime;
1089:
1.13 mycroft 1090: dst = ip->ip_dst;
1.1 cgd 1091: cp = (u_char *)(ip + 1);
1092: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1093: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1094: opt = cp[IPOPT_OPTVAL];
1095: if (opt == IPOPT_EOL)
1096: break;
1097: if (opt == IPOPT_NOP)
1098: optlen = 1;
1099: else {
1.113 itojun 1100: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1101: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1102: goto bad;
1103: }
1.1 cgd 1104: optlen = cp[IPOPT_OLEN];
1.114 itojun 1105: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1106: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1107: goto bad;
1108: }
1109: }
1110: switch (opt) {
1111:
1112: default:
1113: break;
1114:
1115: /*
1116: * Source routing with record.
1117: * Find interface with current destination address.
1118: * If none on this machine then drop if strictly routed,
1119: * or do nothing if loosely routed.
1120: * Record interface address and bring up next address
1121: * component. If strictly routed make sure next
1122: * address is on directly accessible net.
1123: */
1124: case IPOPT_LSRR:
1125: case IPOPT_SSRR:
1.47 cjs 1126: if (ip_allowsrcrt == 0) {
1127: type = ICMP_UNREACH;
1128: code = ICMP_UNREACH_NET_PROHIB;
1129: goto bad;
1130: }
1.114 itojun 1131: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1132: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1133: goto bad;
1134: }
1.1 cgd 1135: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1136: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1137: goto bad;
1138: }
1139: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1140: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1141: if (ia == 0) {
1142: if (opt == IPOPT_SSRR) {
1143: type = ICMP_UNREACH;
1144: code = ICMP_UNREACH_SRCFAIL;
1145: goto bad;
1146: }
1147: /*
1148: * Loose routing, and not at next destination
1149: * yet; nothing to do except forward.
1150: */
1151: break;
1152: }
1153: off--; /* 0 origin */
1.112 sommerfe 1154: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1155: /*
1156: * End of source route. Should be for us.
1157: */
1158: save_rte(cp, ip->ip_src);
1159: break;
1160: }
1161: /*
1162: * locate outgoing interface
1163: */
1164: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1165: sizeof(ipaddr.sin_addr));
1.96 thorpej 1166: if (opt == IPOPT_SSRR)
1167: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1168: else
1.1 cgd 1169: ia = ip_rtaddr(ipaddr.sin_addr);
1170: if (ia == 0) {
1171: type = ICMP_UNREACH;
1172: code = ICMP_UNREACH_SRCFAIL;
1173: goto bad;
1174: }
1175: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1176: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1177: (caddr_t)(cp + off), sizeof(struct in_addr));
1178: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1179: /*
1180: * Let ip_intr's mcast routing check handle mcast pkts
1181: */
1.18 mycroft 1182: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1183: break;
1184:
1185: case IPOPT_RR:
1.114 itojun 1186: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1187: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1188: goto bad;
1189: }
1.1 cgd 1190: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1191: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1192: goto bad;
1193: }
1194: /*
1195: * If no space remains, ignore.
1196: */
1197: off--; /* 0 origin */
1.112 sommerfe 1198: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1199: break;
1200: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1201: sizeof(ipaddr.sin_addr));
1202: /*
1203: * locate outgoing interface; if we're the destination,
1204: * use the incoming interface (should be same).
1205: */
1.96 thorpej 1206: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1207: == NULL &&
1208: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1209: type = ICMP_UNREACH;
1210: code = ICMP_UNREACH_HOST;
1211: goto bad;
1212: }
1.20 mycroft 1213: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1214: (caddr_t)(cp + off), sizeof(struct in_addr));
1215: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1216: break;
1217:
1218: case IPOPT_TS:
1219: code = cp - (u_char *)ip;
1220: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1221: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1222: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1223: goto bad;
1.114 itojun 1224: }
1225: if (ipt->ipt_ptr < 5) {
1226: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1227: goto bad;
1228: }
1.15 cgd 1229: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1230: if (++ipt->ipt_oflw == 0) {
1231: code = (u_char *)&ipt->ipt_ptr -
1232: (u_char *)ip;
1.1 cgd 1233: goto bad;
1.114 itojun 1234: }
1.1 cgd 1235: break;
1236: }
1.104 thorpej 1237: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1238: switch (ipt->ipt_flg) {
1239:
1240: case IPOPT_TS_TSONLY:
1241: break;
1242:
1243: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1244: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1245: sizeof(struct in_addr) > ipt->ipt_len) {
1246: code = (u_char *)&ipt->ipt_ptr -
1247: (u_char *)ip;
1.1 cgd 1248: goto bad;
1.114 itojun 1249: }
1.13 mycroft 1250: ipaddr.sin_addr = dst;
1.96 thorpej 1251: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1252: m->m_pkthdr.rcvif));
1.13 mycroft 1253: if (ia == 0)
1254: continue;
1.104 thorpej 1255: bcopy(&ia->ia_addr.sin_addr,
1256: cp0, sizeof(struct in_addr));
1.1 cgd 1257: ipt->ipt_ptr += sizeof(struct in_addr);
1258: break;
1259:
1260: case IPOPT_TS_PRESPEC:
1.66 thorpej 1261: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1262: sizeof(struct in_addr) > ipt->ipt_len) {
1263: code = (u_char *)&ipt->ipt_ptr -
1264: (u_char *)ip;
1.1 cgd 1265: goto bad;
1.114 itojun 1266: }
1.104 thorpej 1267: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1268: sizeof(struct in_addr));
1.96 thorpej 1269: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1270: == NULL)
1.1 cgd 1271: continue;
1272: ipt->ipt_ptr += sizeof(struct in_addr);
1273: break;
1274:
1275: default:
1.114 itojun 1276: /* XXX can't take &ipt->ipt_flg */
1277: code = (u_char *)&ipt->ipt_ptr -
1278: (u_char *)ip + 1;
1.1 cgd 1279: goto bad;
1280: }
1281: ntime = iptime();
1.107 thorpej 1282: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1283: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1284: sizeof(n_time));
1285: ipt->ipt_ptr += sizeof(n_time);
1286: }
1287: }
1288: if (forward) {
1.26 thorpej 1289: if (ip_forwsrcrt == 0) {
1290: type = ICMP_UNREACH;
1291: code = ICMP_UNREACH_SRCFAIL;
1292: goto bad;
1293: }
1.1 cgd 1294: ip_forward(m, 1);
1295: return (1);
1.13 mycroft 1296: }
1297: return (0);
1.1 cgd 1298: bad:
1.13 mycroft 1299: icmp_error(m, type, code, 0, 0);
1300: ipstat.ips_badoptions++;
1.1 cgd 1301: return (1);
1302: }
1303:
1304: /*
1305: * Given address of next destination (final or next hop),
1306: * return internet address info of interface to be used to get there.
1307: */
1308: struct in_ifaddr *
1309: ip_rtaddr(dst)
1310: struct in_addr dst;
1311: {
1.109 augustss 1312: struct sockaddr_in *sin;
1.1 cgd 1313:
1.19 mycroft 1314: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1315:
1.35 mycroft 1316: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1317: if (ipforward_rt.ro_rt) {
1318: RTFREE(ipforward_rt.ro_rt);
1319: ipforward_rt.ro_rt = 0;
1320: }
1321: sin->sin_family = AF_INET;
1322: sin->sin_len = sizeof(*sin);
1323: sin->sin_addr = dst;
1324:
1325: rtalloc(&ipforward_rt);
1326: }
1327: if (ipforward_rt.ro_rt == 0)
1328: return ((struct in_ifaddr *)0);
1.19 mycroft 1329: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1330: }
1331:
1332: /*
1333: * Save incoming source route for use in replies,
1334: * to be picked up later by ip_srcroute if the receiver is interested.
1335: */
1.13 mycroft 1336: void
1.1 cgd 1337: save_rte(option, dst)
1338: u_char *option;
1339: struct in_addr dst;
1340: {
1341: unsigned olen;
1342:
1343: olen = option[IPOPT_OLEN];
1344: #ifdef DIAGNOSTIC
1345: if (ipprintfs)
1.39 christos 1346: printf("save_rte: olen %d\n", olen);
1.89 itojun 1347: #endif /* 0 */
1.1 cgd 1348: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1349: return;
1350: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1351: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1352: ip_srcrt.dst = dst;
1353: }
1354:
1355: /*
1356: * Retrieve incoming source route for use in replies,
1357: * in the same form used by setsockopt.
1358: * The first hop is placed before the options, will be removed later.
1359: */
1360: struct mbuf *
1361: ip_srcroute()
1362: {
1.109 augustss 1363: struct in_addr *p, *q;
1364: struct mbuf *m;
1.1 cgd 1365:
1366: if (ip_nhops == 0)
1367: return ((struct mbuf *)0);
1368: m = m_get(M_DONTWAIT, MT_SOOPTS);
1369: if (m == 0)
1370: return ((struct mbuf *)0);
1371:
1.13 mycroft 1372: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1373:
1374: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1375: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1376: OPTSIZ;
1377: #ifdef DIAGNOSTIC
1378: if (ipprintfs)
1.39 christos 1379: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1380: #endif
1381:
1382: /*
1383: * First save first hop for return route
1384: */
1385: p = &ip_srcrt.route[ip_nhops - 1];
1386: *(mtod(m, struct in_addr *)) = *p--;
1387: #ifdef DIAGNOSTIC
1388: if (ipprintfs)
1.39 christos 1389: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1390: #endif
1391:
1392: /*
1393: * Copy option fields and padding (nop) to mbuf.
1394: */
1395: ip_srcrt.nop = IPOPT_NOP;
1396: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1397: bcopy((caddr_t)&ip_srcrt.nop,
1398: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1399: q = (struct in_addr *)(mtod(m, caddr_t) +
1400: sizeof(struct in_addr) + OPTSIZ);
1401: #undef OPTSIZ
1402: /*
1403: * Record return path as an IP source route,
1404: * reversing the path (pointers are now aligned).
1405: */
1406: while (p >= ip_srcrt.route) {
1407: #ifdef DIAGNOSTIC
1408: if (ipprintfs)
1.39 christos 1409: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1410: #endif
1411: *q++ = *p--;
1412: }
1413: /*
1414: * Last hop goes to final destination.
1415: */
1416: *q = ip_srcrt.dst;
1417: #ifdef DIAGNOSTIC
1418: if (ipprintfs)
1.39 christos 1419: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1420: #endif
1421: return (m);
1422: }
1423:
1424: /*
1425: * Strip out IP options, at higher
1426: * level protocol in the kernel.
1427: * Second argument is buffer to which options
1428: * will be moved, and return value is their length.
1429: * XXX should be deleted; last arg currently ignored.
1430: */
1.8 mycroft 1431: void
1.1 cgd 1432: ip_stripoptions(m, mopt)
1.109 augustss 1433: struct mbuf *m;
1.1 cgd 1434: struct mbuf *mopt;
1435: {
1.109 augustss 1436: int i;
1.1 cgd 1437: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1438: caddr_t opts;
1.1 cgd 1439: int olen;
1440:
1.79 mycroft 1441: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1442: opts = (caddr_t)(ip + 1);
1443: i = m->m_len - (sizeof (struct ip) + olen);
1444: bcopy(opts + olen, opts, (unsigned)i);
1445: m->m_len -= olen;
1446: if (m->m_flags & M_PKTHDR)
1447: m->m_pkthdr.len -= olen;
1.79 mycroft 1448: ip->ip_len -= olen;
1449: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1450: }
1451:
1.139 matt 1452: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1453: 0, 0, 0, 0,
1454: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1455: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1456: EMSGSIZE, EHOSTUNREACH, 0, 0,
1457: 0, 0, 0, 0,
1458: ENOPROTOOPT
1459: };
1460:
1461: /*
1462: * Forward a packet. If some error occurs return the sender
1463: * an icmp packet. Note we can't always generate a meaningful
1464: * icmp message because icmp doesn't have a large enough repertoire
1465: * of codes and types.
1466: *
1467: * If not forwarding, just drop the packet. This could be confusing
1468: * if ipforwarding was zero but some routing protocol was advancing
1469: * us as a gateway to somewhere. However, we must let the routing
1470: * protocol deal with that.
1471: *
1472: * The srcrt parameter indicates whether the packet is being forwarded
1473: * via a source route.
1474: */
1.13 mycroft 1475: void
1.1 cgd 1476: ip_forward(m, srcrt)
1477: struct mbuf *m;
1478: int srcrt;
1479: {
1.109 augustss 1480: struct ip *ip = mtod(m, struct ip *);
1481: struct sockaddr_in *sin;
1482: struct rtentry *rt;
1.28 christos 1483: int error, type = 0, code = 0;
1.1 cgd 1484: struct mbuf *mcopy;
1.13 mycroft 1485: n_long dest;
1486: struct ifnet *destifp;
1.89 itojun 1487: #ifdef IPSEC
1488: struct ifnet dummyifp;
1489: #endif
1.135 thorpej 1490:
1491: /*
1492: * Clear any in-bound checksum flags for this packet.
1493: */
1494: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1495:
1.13 mycroft 1496: dest = 0;
1.1 cgd 1497: #ifdef DIAGNOSTIC
1498: if (ipprintfs)
1.70 thorpej 1499: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1500: ntohl(ip->ip_src.s_addr),
1501: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1502: #endif
1.93 sommerfe 1503: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1504: ipstat.ips_cantforward++;
1505: m_freem(m);
1506: return;
1507: }
1508: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1509: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1510: return;
1511: }
1512: ip->ip_ttl -= IPTTLDEC;
1513:
1.19 mycroft 1514: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1515: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1516: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1517: if (ipforward_rt.ro_rt) {
1518: RTFREE(ipforward_rt.ro_rt);
1519: ipforward_rt.ro_rt = 0;
1520: }
1521: sin->sin_family = AF_INET;
1.35 mycroft 1522: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1523: sin->sin_addr = ip->ip_dst;
1524:
1525: rtalloc(&ipforward_rt);
1526: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1527: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1528: return;
1529: }
1530: rt = ipforward_rt.ro_rt;
1531: }
1532:
1533: /*
1.34 mycroft 1534: * Save at most 68 bytes of the packet in case
1.1 cgd 1535: * we need to generate an ICMP message to the src.
1.119 itojun 1536: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1537: */
1.119 itojun 1538: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1539: if (mcopy)
1540: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1541:
1542: /*
1543: * If forwarding packet using same interface that it came in on,
1544: * perhaps should send a redirect to sender to shortcut a hop.
1545: * Only send redirect if source is sending directly to us,
1546: * and if packet was not source routed (or has any options).
1547: * Also, don't send redirect if forwarding using a default route
1548: * or a route modified by a redirect.
1549: */
1550: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1551: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1552: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1553: ipsendredirects && !srcrt) {
1.19 mycroft 1554: if (rt->rt_ifa &&
1555: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1556: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1557: if (rt->rt_flags & RTF_GATEWAY)
1558: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1559: else
1560: dest = ip->ip_dst.s_addr;
1561: /*
1562: * Router requirements says to only send host
1563: * redirects.
1564: */
1565: type = ICMP_REDIRECT;
1566: code = ICMP_REDIRECT_HOST;
1.1 cgd 1567: #ifdef DIAGNOSTIC
1.77 thorpej 1568: if (ipprintfs)
1569: printf("redirect (%d) to %x\n", code,
1570: (u_int32_t)dest);
1.1 cgd 1571: #endif
1572: }
1573: }
1574:
1.89 itojun 1575: #ifdef IPSEC
1.134 lukem 1576: /* Don't lookup socket in forwarding case */
1.127 itojun 1577: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1578: #endif
1.27 thorpej 1579: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1580: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1581: if (error)
1582: ipstat.ips_cantforward++;
1583: else {
1584: ipstat.ips_forward++;
1585: if (type)
1586: ipstat.ips_redirectsent++;
1587: else {
1.63 matt 1588: if (mcopy) {
1589: #ifdef GATEWAY
1.64 thorpej 1590: if (mcopy->m_flags & M_CANFASTFWD)
1591: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1592: #endif
1.1 cgd 1593: m_freem(mcopy);
1.63 matt 1594: }
1.1 cgd 1595: return;
1596: }
1597: }
1598: if (mcopy == NULL)
1599: return;
1.13 mycroft 1600: destifp = NULL;
1601:
1.1 cgd 1602: switch (error) {
1603:
1604: case 0: /* forwarded, but need redirect */
1605: /* type, code set above */
1606: break;
1607:
1608: case ENETUNREACH: /* shouldn't happen, checked above */
1609: case EHOSTUNREACH:
1610: case ENETDOWN:
1611: case EHOSTDOWN:
1612: default:
1613: type = ICMP_UNREACH;
1614: code = ICMP_UNREACH_HOST;
1615: break;
1616:
1617: case EMSGSIZE:
1618: type = ICMP_UNREACH;
1619: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1620: #ifndef IPSEC
1.13 mycroft 1621: if (ipforward_rt.ro_rt)
1622: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1623: #else
1624: /*
1625: * If the packet is routed over IPsec tunnel, tell the
1626: * originator the tunnel MTU.
1627: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1628: * XXX quickhack!!!
1629: */
1630: if (ipforward_rt.ro_rt) {
1631: struct secpolicy *sp;
1632: int ipsecerror;
1.95 itojun 1633: size_t ipsechdr;
1.89 itojun 1634: struct route *ro;
1635:
1636: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1637: IPSEC_DIR_OUTBOUND,
1638: IP_FORWARDING,
1639: &ipsecerror);
1.89 itojun 1640:
1641: if (sp == NULL)
1642: destifp = ipforward_rt.ro_rt->rt_ifp;
1643: else {
1644: /* count IPsec header size */
1.95 itojun 1645: ipsechdr = ipsec4_hdrsiz(mcopy,
1646: IPSEC_DIR_OUTBOUND,
1647: NULL);
1.89 itojun 1648:
1649: /*
1650: * find the correct route for outer IPv4
1651: * header, compute tunnel MTU.
1652: *
1653: * XXX BUG ALERT
1654: * The "dummyifp" code relies upon the fact
1655: * that icmp_error() touches only ifp->if_mtu.
1656: */
1657: /*XXX*/
1658: destifp = NULL;
1659: if (sp->req != NULL
1.95 itojun 1660: && sp->req->sav != NULL
1661: && sp->req->sav->sah != NULL) {
1662: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1663: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1664: dummyifp.if_mtu =
1.151 itojun 1665: ro->ro_rt->rt_rmx.rmx_mtu ?
1666: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 1667: ro->ro_rt->rt_ifp->if_mtu;
1668: dummyifp.if_mtu -= ipsechdr;
1669: destifp = &dummyifp;
1670: }
1671: }
1672:
1673: key_freesp(sp);
1674: }
1675: }
1676: #endif /*IPSEC*/
1.1 cgd 1677: ipstat.ips_cantfrag++;
1678: break;
1679:
1680: case ENOBUFS:
1.143 itojun 1681: #if 1
1682: /*
1683: * a router should not generate ICMP_SOURCEQUENCH as
1684: * required in RFC1812 Requirements for IP Version 4 Routers.
1685: * source quench could be a big problem under DoS attacks,
1.149 wiz 1686: * or if the underlying interface is rate-limited.
1.143 itojun 1687: */
1688: if (mcopy)
1689: m_freem(mcopy);
1690: return;
1691: #else
1.1 cgd 1692: type = ICMP_SOURCEQUENCH;
1693: code = 0;
1694: break;
1.143 itojun 1695: #endif
1.1 cgd 1696: }
1.13 mycroft 1697: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1698: }
1699:
1700: void
1701: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1702: struct inpcb *inp;
1703: struct mbuf **mp;
1704: struct ip *ip;
1705: struct mbuf *m;
1.44 thorpej 1706: {
1707:
1708: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1709: struct timeval tv;
1710:
1711: microtime(&tv);
1712: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1713: SCM_TIMESTAMP, SOL_SOCKET);
1714: if (*mp)
1715: mp = &(*mp)->m_next;
1716: }
1717: if (inp->inp_flags & INP_RECVDSTADDR) {
1718: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1719: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1720: if (*mp)
1721: mp = &(*mp)->m_next;
1722: }
1723: #ifdef notyet
1724: /*
1725: * XXX
1726: * Moving these out of udp_input() made them even more broken
1727: * than they already were.
1728: * - fenner@parc.xerox.com
1729: */
1730: /* options were tossed already */
1731: if (inp->inp_flags & INP_RECVOPTS) {
1732: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1733: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1734: if (*mp)
1735: mp = &(*mp)->m_next;
1736: }
1737: /* ip_srcroute doesn't do what we want here, need to fix */
1738: if (inp->inp_flags & INP_RECVRETOPTS) {
1739: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1740: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1741: if (*mp)
1742: mp = &(*mp)->m_next;
1743: }
1744: #endif
1745: if (inp->inp_flags & INP_RECVIF) {
1746: struct sockaddr_dl sdl;
1747:
1748: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1749: sdl.sdl_family = AF_LINK;
1750: sdl.sdl_index = m->m_pkthdr.rcvif ?
1751: m->m_pkthdr.rcvif->if_index : 0;
1752: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1753: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1754: IP_RECVIF, IPPROTO_IP);
1755: if (*mp)
1756: mp = &(*mp)->m_next;
1757: }
1.13 mycroft 1758: }
1759:
1760: int
1761: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1762: int *name;
1763: u_int namelen;
1764: void *oldp;
1765: size_t *oldlenp;
1766: void *newp;
1767: size_t newlen;
1768: {
1.88 sommerfe 1769: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1770:
1.54 lukem 1771: int error, old;
1772:
1.13 mycroft 1773: /* All sysctl names at this level are terminal. */
1774: if (namelen != 1)
1775: return (ENOTDIR);
1776:
1777: switch (name[0]) {
1778: case IPCTL_FORWARDING:
1779: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1780: case IPCTL_SENDREDIRECTS:
1781: return (sysctl_int(oldp, oldlenp, newp, newlen,
1782: &ipsendredirects));
1783: case IPCTL_DEFTTL:
1784: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1785: #ifdef notyet
1786: case IPCTL_DEFMTU:
1787: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1788: #endif
1.26 thorpej 1789: case IPCTL_FORWSRCRT:
1.47 cjs 1790: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1791: if (securelevel > 0)
1.46 cjs 1792: return (sysctl_rdint(oldp, oldlenp, newp,
1793: ip_forwsrcrt));
1794: else
1795: return (sysctl_int(oldp, oldlenp, newp, newlen,
1796: &ip_forwsrcrt));
1.27 thorpej 1797: case IPCTL_DIRECTEDBCAST:
1798: return (sysctl_int(oldp, oldlenp, newp, newlen,
1799: &ip_directedbcast));
1.47 cjs 1800: case IPCTL_ALLOWSRCRT:
1801: return (sysctl_int(oldp, oldlenp, newp, newlen,
1802: &ip_allowsrcrt));
1.52 thorpej 1803: case IPCTL_SUBNETSARELOCAL:
1804: return (sysctl_int(oldp, oldlenp, newp, newlen,
1805: &subnetsarelocal));
1.53 kml 1806: case IPCTL_MTUDISC:
1.60 kml 1807: error = sysctl_int(oldp, oldlenp, newp, newlen,
1808: &ip_mtudisc);
1809: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1.152 ! itojun 1810: ip_mtudisc_timeout_q =
1.60 kml 1811: rt_timer_queue_create(ip_mtudisc_timeout);
1812: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1813: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1814: ip_mtudisc_timeout_q = NULL;
1815: }
1816: return error;
1.54 lukem 1817: case IPCTL_ANONPORTMIN:
1818: old = anonportmin;
1819: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1820: if (anonportmin >= anonportmax || anonportmin < 0
1821: || anonportmin > 65535
1.54 lukem 1822: #ifndef IPNOPRIVPORTS
1823: || anonportmin < IPPORT_RESERVED
1824: #endif
1825: ) {
1826: anonportmin = old;
1827: return (EINVAL);
1828: }
1829: return (error);
1830: case IPCTL_ANONPORTMAX:
1831: old = anonportmax;
1832: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1833: if (anonportmin >= anonportmax || anonportmax < 0
1834: || anonportmax > 65535
1.54 lukem 1835: #ifndef IPNOPRIVPORTS
1836: || anonportmax < IPPORT_RESERVED
1837: #endif
1838: ) {
1839: anonportmax = old;
1840: return (EINVAL);
1841: }
1.60 kml 1842: return (error);
1843: case IPCTL_MTUDISCTIMEOUT:
1844: error = sysctl_int(oldp, oldlenp, newp, newlen,
1845: &ip_mtudisc_timeout);
1846: if (ip_mtudisc_timeout_q != NULL)
1.152 ! itojun 1847: rt_timer_queue_change(ip_mtudisc_timeout_q,
1.60 kml 1848: ip_mtudisc_timeout);
1.54 lukem 1849: return (error);
1.65 matt 1850: #ifdef GATEWAY
1851: case IPCTL_MAXFLOWS:
1.67 thorpej 1852: {
1853: int s;
1854:
1.65 matt 1855: error = sysctl_int(oldp, oldlenp, newp, newlen,
1856: &ip_maxflows);
1.67 thorpej 1857: s = splsoftnet();
1.65 matt 1858: ipflow_reap(0);
1.67 thorpej 1859: splx(s);
1.65 matt 1860: return (error);
1.67 thorpej 1861: }
1.89 itojun 1862: #endif
1.90 itojun 1863: case IPCTL_HOSTZEROBROADCAST:
1864: return (sysctl_int(oldp, oldlenp, newp, newlen,
1865: &hostzeroisbroadcast));
1.89 itojun 1866: #if NGIF > 0
1867: case IPCTL_GIF_TTL:
1868: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1869: &ip_gif_ttl));
1.144 martin 1870: #endif
1871:
1872: #if NGRE > 0
1873: case IPCTL_GRE_TTL:
1874: return(sysctl_int(oldp, oldlenp, newp, newlen,
1875: &ip_gre_ttl));
1.117 tron 1876: #endif
1877:
1878: #ifndef IPNOPRIVPORTS
1879: case IPCTL_LOWPORTMIN:
1880: old = lowportmin;
1881: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1882: if (lowportmin >= lowportmax
1883: || lowportmin > IPPORT_RESERVEDMAX
1884: || lowportmin < IPPORT_RESERVEDMIN
1885: ) {
1886: lowportmin = old;
1887: return (EINVAL);
1888: }
1889: return (error);
1890: case IPCTL_LOWPORTMAX:
1891: old = lowportmax;
1892: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1893: if (lowportmin >= lowportmax
1894: || lowportmax > IPPORT_RESERVEDMAX
1895: || lowportmax < IPPORT_RESERVEDMIN
1896: ) {
1897: lowportmax = old;
1898: return (EINVAL);
1899: }
1900: return (error);
1.65 matt 1901: #endif
1.131 itojun 1902:
1903: case IPCTL_MAXFRAGPACKETS:
1904: return (sysctl_int(oldp, oldlenp, newp, newlen,
1905: &ip_maxfragpackets));
1.88 sommerfe 1906:
1.13 mycroft 1907: default:
1908: return (EOPNOTSUPP);
1909: }
1910: /* NOTREACHED */
1.1 cgd 1911: }
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