Annotation of src/sys/netinet/ip_input.c, Revision 1.141
1.141 ! lukem 1: /* $NetBSD: ip_input.c,v 1.140 2001/11/04 20:55:27 matt Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.141 ! lukem 103:
! 104: #include <sys/cdefs.h>
! 105: __KERNEL_RCSID(0, "$NetBSD$");
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"
1.111 jdolecek 142:
143: #ifdef MROUTING
144: #include <netinet/ip_mroute.h>
145: #endif
1.89 itojun 146:
147: #ifdef IPSEC
148: #include <netinet6/ipsec.h>
149: #include <netkey/key.h>
150: #endif
1.44 thorpej 151:
1.1 cgd 152: #ifndef IPFORWARDING
153: #ifdef GATEWAY
154: #define IPFORWARDING 1 /* forward IP packets not for us */
155: #else /* GATEWAY */
156: #define IPFORWARDING 0 /* don't forward IP packets not for us */
157: #endif /* GATEWAY */
158: #endif /* IPFORWARDING */
159: #ifndef IPSENDREDIRECTS
160: #define IPSENDREDIRECTS 1
161: #endif
1.26 thorpej 162: #ifndef IPFORWSRCRT
1.47 cjs 163: #define IPFORWSRCRT 1 /* forward source-routed packets */
164: #endif
165: #ifndef IPALLOWSRCRT
1.48 mrg 166: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 167: #endif
1.53 kml 168: #ifndef IPMTUDISC
169: #define IPMTUDISC 0
170: #endif
1.60 kml 171: #ifndef IPMTUDISCTIMEOUT
1.61 kml 172: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 173: #endif
1.53 kml 174:
1.27 thorpej 175: /*
176: * Note: DIRECTED_BROADCAST is handled this way so that previous
177: * configuration using this option will Just Work.
178: */
179: #ifndef IPDIRECTEDBCAST
180: #ifdef DIRECTED_BROADCAST
181: #define IPDIRECTEDBCAST 1
182: #else
183: #define IPDIRECTEDBCAST 0
184: #endif /* DIRECTED_BROADCAST */
185: #endif /* IPDIRECTEDBCAST */
1.1 cgd 186: int ipforwarding = IPFORWARDING;
187: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 188: int ip_defttl = IPDEFTTL;
1.26 thorpej 189: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 190: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 191: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 192: int ip_mtudisc = IPMTUDISC;
1.60 kml 193: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
197:
1.60 kml 198: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
199:
1.1 cgd 200: extern struct domain inetdomain;
201: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 202: struct in_ifaddrhead in_ifaddr;
1.57 tls 203: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 204: struct ifqueue ipintrq;
1.63 matt 205: struct ipstat ipstat;
206: u_int16_t ip_id;
1.75 thorpej 207:
1.121 thorpej 208: #ifdef PFIL_HOOKS
209: struct pfil_head inet_pfil_hook;
210: #endif
211:
1.63 matt 212: struct ipqhead ipq;
1.75 thorpej 213: int ipq_locked;
1.131 itojun 214: int ip_nfragpackets = 0;
1.133 itojun 215: int ip_maxfragpackets = 200;
1.75 thorpej 216:
217: static __inline int ipq_lock_try __P((void));
218: static __inline void ipq_unlock __P((void));
219:
220: static __inline int
221: ipq_lock_try()
222: {
223: int s;
224:
1.132 thorpej 225: /*
226: * Use splvm() -- we're bloking things that would cause
227: * mbuf allocation.
228: */
229: s = splvm();
1.75 thorpej 230: if (ipq_locked) {
231: splx(s);
232: return (0);
233: }
234: ipq_locked = 1;
235: splx(s);
236: return (1);
237: }
238:
239: static __inline void
240: ipq_unlock()
241: {
242: int s;
243:
1.132 thorpej 244: s = splvm();
1.75 thorpej 245: ipq_locked = 0;
246: splx(s);
247: }
248:
249: #ifdef DIAGNOSTIC
250: #define IPQ_LOCK() \
251: do { \
252: if (ipq_lock_try() == 0) { \
253: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
254: panic("ipq_lock"); \
255: } \
256: } while (0)
257: #define IPQ_LOCK_CHECK() \
258: do { \
259: if (ipq_locked == 0) { \
260: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
261: panic("ipq lock check"); \
262: } \
263: } while (0)
264: #else
265: #define IPQ_LOCK() (void) ipq_lock_try()
266: #define IPQ_LOCK_CHECK() /* nothing */
267: #endif
268:
269: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 270:
1.72 thorpej 271: struct pool ipqent_pool;
272:
1.135 thorpej 273: #ifdef INET_CSUM_COUNTERS
274: #include <sys/device.h>
275:
276: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
277: NULL, "inet", "hwcsum bad");
278: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
279: NULL, "inet", "hwcsum ok");
280: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
281: NULL, "inet", "swcsum");
282:
283: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
284:
285: #else
286:
287: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
288:
289: #endif /* INET_CSUM_COUNTERS */
290:
1.1 cgd 291: /*
292: * We need to save the IP options in case a protocol wants to respond
293: * to an incoming packet over the same route if the packet got here
294: * using IP source routing. This allows connection establishment and
295: * maintenance when the remote end is on a network that is not known
296: * to us.
297: */
298: int ip_nhops = 0;
299: static struct ip_srcrt {
300: struct in_addr dst; /* final destination */
301: char nop; /* one NOP to align */
302: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
303: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
304: } ip_srcrt;
305:
1.13 mycroft 306: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 307:
1.1 cgd 308: /*
309: * IP initialization: fill in IP protocol switch table.
310: * All protocols not implemented in kernel go to raw IP protocol handler.
311: */
1.8 mycroft 312: void
1.1 cgd 313: ip_init()
314: {
1.109 augustss 315: struct protosw *pr;
316: int i;
1.1 cgd 317:
1.72 thorpej 318: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
319: 0, NULL, NULL, M_IPQ);
320:
1.1 cgd 321: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
322: if (pr == 0)
323: panic("ip_init");
324: for (i = 0; i < IPPROTO_MAX; i++)
325: ip_protox[i] = pr - inetsw;
326: for (pr = inetdomain.dom_protosw;
327: pr < inetdomain.dom_protoswNPROTOSW; pr++)
328: if (pr->pr_domain->dom_family == PF_INET &&
329: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
330: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 331: LIST_INIT(&ipq);
1.1 cgd 332: ip_id = time.tv_sec & 0xffff;
333: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 334: TAILQ_INIT(&in_ifaddr);
1.120 ad 335: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
336: M_WAITOK, &in_ifaddrhash);
1.60 kml 337: if (ip_mtudisc != 0)
338: ip_mtudisc_timeout_q =
339: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 340: #ifdef GATEWAY
341: ipflow_init();
342: #endif
1.121 thorpej 343:
344: #ifdef PFIL_HOOKS
345: /* Register our Packet Filter hook. */
1.126 thorpej 346: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
347: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 348: i = pfil_head_register(&inet_pfil_hook);
349: if (i != 0)
350: printf("ip_init: WARNING: unable to register pfil hook, "
351: "error %d\n", i);
352: #endif /* PFIL_HOOKS */
1.135 thorpej 353:
354: #ifdef INET_CSUM_COUNTERS
355: evcnt_attach_static(&ip_hwcsum_bad);
356: evcnt_attach_static(&ip_hwcsum_ok);
357: evcnt_attach_static(&ip_swcsum);
358: #endif /* INET_CSUM_COUNTERS */
1.1 cgd 359: }
360:
361: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
362: struct route ipforward_rt;
363:
364: /*
1.89 itojun 365: * IP software interrupt routine
366: */
367: void
368: ipintr()
369: {
370: int s;
371: struct mbuf *m;
372:
373: while (1) {
1.132 thorpej 374: s = splnet();
1.89 itojun 375: IF_DEQUEUE(&ipintrq, m);
376: splx(s);
377: if (m == 0)
378: return;
379: ip_input(m);
380: }
381: }
382:
383: /*
1.1 cgd 384: * Ip input routine. Checksum and byte swap header. If fragmented
385: * try to reassemble. Process options. Pass to next level.
386: */
1.8 mycroft 387: void
1.89 itojun 388: ip_input(struct mbuf *m)
1.1 cgd 389: {
1.109 augustss 390: struct ip *ip = NULL;
391: struct ipq *fp;
392: struct in_ifaddr *ia;
393: struct ifaddr *ifa;
1.25 cgd 394: struct ipqent *ipqe;
1.89 itojun 395: int hlen = 0, mff, len;
1.100 itojun 396: int downmatch;
1.1 cgd 397:
398: #ifdef DIAGNOSTIC
399: if ((m->m_flags & M_PKTHDR) == 0)
400: panic("ipintr no HDR");
401: #endif
1.89 itojun 402: #ifdef IPSEC
403: /*
404: * should the inner packet be considered authentic?
405: * see comment in ah4_input().
406: */
407: if (m) {
408: m->m_flags &= ~M_AUTHIPHDR;
409: m->m_flags &= ~M_AUTHIPDGM;
410: }
411: #endif
1.1 cgd 412: /*
413: * If no IP addresses have been set yet but the interfaces
414: * are receiving, can't do anything with incoming packets yet.
415: */
1.140 matt 416: if (TAILQ_FIRST(&in_ifaddr) == 0)
1.1 cgd 417: goto bad;
418: ipstat.ips_total++;
419: if (m->m_len < sizeof (struct ip) &&
420: (m = m_pullup(m, sizeof (struct ip))) == 0) {
421: ipstat.ips_toosmall++;
1.89 itojun 422: return;
1.1 cgd 423: }
424: ip = mtod(m, struct ip *);
1.13 mycroft 425: if (ip->ip_v != IPVERSION) {
426: ipstat.ips_badvers++;
427: goto bad;
428: }
1.1 cgd 429: hlen = ip->ip_hl << 2;
430: if (hlen < sizeof(struct ip)) { /* minimum header length */
431: ipstat.ips_badhlen++;
432: goto bad;
433: }
434: if (hlen > m->m_len) {
435: if ((m = m_pullup(m, hlen)) == 0) {
436: ipstat.ips_badhlen++;
1.89 itojun 437: return;
1.1 cgd 438: }
439: ip = mtod(m, struct ip *);
440: }
1.98 thorpej 441:
1.85 hwr 442: /*
1.99 thorpej 443: * RFC1122: packets with a multicast source address are
1.98 thorpej 444: * not allowed.
1.85 hwr 445: */
446: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 447: ipstat.ips_badaddr++;
1.85 hwr 448: goto bad;
1.129 itojun 449: }
450:
451: /* 127/8 must not appear on wire - RFC1122 */
452: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
453: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 454: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
455: ipstat.ips_badaddr++;
1.129 itojun 456: goto bad;
1.130 itojun 457: }
1.85 hwr 458: }
459:
1.135 thorpej 460: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 461: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 462: M_CSUM_IPv4_BAD)) {
463: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
464: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
465: goto badcsum;
466:
467: case M_CSUM_IPv4:
468: /* Checksum was okay. */
469: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
470: break;
471:
472: default:
473: /* Must compute it ourselves. */
474: INET_CSUM_COUNTER_INCR(&ip_swcsum);
475: if (in_cksum(m, hlen) != 0)
476: goto bad;
477: break;
1.1 cgd 478: }
479:
1.121 thorpej 480: /* Retrieve the packet length. */
481: len = ntohs(ip->ip_len);
1.81 proff 482:
483: /*
484: * Check for additional length bogosity
485: */
1.84 proff 486: if (len < hlen) {
1.81 proff 487: ipstat.ips_badlen++;
488: goto bad;
489: }
1.1 cgd 490:
491: /*
492: * Check that the amount of data in the buffers
493: * is as at least much as the IP header would have us expect.
494: * Trim mbufs if longer than we expect.
495: * Drop packet if shorter than we expect.
496: */
1.35 mycroft 497: if (m->m_pkthdr.len < len) {
1.1 cgd 498: ipstat.ips_tooshort++;
499: goto bad;
500: }
1.35 mycroft 501: if (m->m_pkthdr.len > len) {
1.1 cgd 502: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 503: m->m_len = len;
504: m->m_pkthdr.len = len;
1.1 cgd 505: } else
1.35 mycroft 506: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 507: }
508:
1.94 itojun 509: #ifdef IPSEC
510: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
511: m->m_flags &= ~M_CANFASTFWD;
512: #else
1.64 thorpej 513: /*
514: * Assume that we can create a fast-forward IP flow entry
515: * based on this packet.
516: */
517: m->m_flags |= M_CANFASTFWD;
1.94 itojun 518: #endif
1.64 thorpej 519:
1.36 mrg 520: #ifdef PFIL_HOOKS
1.33 mrg 521: /*
1.64 thorpej 522: * Run through list of hooks for input packets. If there are any
523: * filters which require that additional packets in the flow are
524: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
525: * Note that filters must _never_ set this flag, as another filter
526: * in the list may have previously cleared it.
1.33 mrg 527: */
1.127 itojun 528: /*
529: * let ipfilter look at packet on the wire,
530: * not the decapsulated packet.
531: */
532: #ifdef IPSEC
1.136 itojun 533: if (!ipsec_getnhist(m))
1.127 itojun 534: #else
535: if (1)
536: #endif
537: {
538: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
539: PFIL_IN) != 0)
1.121 thorpej 540: return;
1.127 itojun 541: if (m == NULL)
542: return;
543: ip = mtod(m, struct ip *);
544: }
1.36 mrg 545: #endif /* PFIL_HOOKS */
1.123 thorpej 546:
547: #ifdef ALTQ
548: /* XXX Temporary until ALTQ is changed to use a pfil hook */
549: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
550: /* packet dropped by traffic conditioner */
551: return;
552: }
553: #endif
1.121 thorpej 554:
555: /*
556: * Convert fields to host representation.
557: */
558: NTOHS(ip->ip_len);
559: NTOHS(ip->ip_off);
1.33 mrg 560:
1.1 cgd 561: /*
562: * Process options and, if not destined for us,
563: * ship it on. ip_dooptions returns 1 when an
564: * error was detected (causing an icmp message
565: * to be sent and the original packet to be freed).
566: */
567: ip_nhops = 0; /* for source routed packets */
568: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 569: return;
1.1 cgd 570:
571: /*
572: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 573: *
574: * Traditional 4.4BSD did not consult IFF_UP at all.
575: * The behavior here is to treat addresses on !IFF_UP interface
576: * as not mine.
1.1 cgd 577: */
1.100 itojun 578: downmatch = 0;
1.140 matt 579: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 580: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
581: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
582: break;
1.100 itojun 583: else
584: downmatch++;
1.97 itojun 585: }
586: }
1.86 thorpej 587: if (ia != NULL)
588: goto ours;
1.57 tls 589: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140 matt 590: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
591: if (ifa->ifa_addr->sa_family != AF_INET)
592: continue;
1.57 tls 593: ia = ifatoia(ifa);
1.35 mycroft 594: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
595: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 596: /*
597: * Look for all-0's host part (old broadcast addr),
598: * either for subnet or net.
599: */
600: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 601: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 602: goto ours;
1.57 tls 603: /*
604: * An interface with IP address zero accepts
605: * all packets that arrive on that interface.
606: */
607: if (in_nullhost(ia->ia_addr.sin_addr))
608: goto ours;
1.1 cgd 609: }
610: }
1.18 mycroft 611: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 612: struct in_multi *inm;
613: #ifdef MROUTING
614: extern struct socket *ip_mrouter;
1.10 brezak 615:
616: if (m->m_flags & M_EXT) {
617: if ((m = m_pullup(m, hlen)) == 0) {
618: ipstat.ips_toosmall++;
1.89 itojun 619: return;
1.10 brezak 620: }
621: ip = mtod(m, struct ip *);
622: }
1.4 hpeyerl 623:
624: if (ip_mrouter) {
625: /*
626: * If we are acting as a multicast router, all
627: * incoming multicast packets are passed to the
628: * kernel-level multicast forwarding function.
629: * The packet is returned (relatively) intact; if
630: * ip_mforward() returns a non-zero value, the packet
631: * must be discarded, else it may be accepted below.
632: *
633: * (The IP ident field is put in the same byte order
634: * as expected when ip_mforward() is called from
635: * ip_output().)
636: */
1.13 mycroft 637: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
638: ipstat.ips_cantforward++;
1.4 hpeyerl 639: m_freem(m);
1.89 itojun 640: return;
1.4 hpeyerl 641: }
642:
643: /*
644: * The process-level routing demon needs to receive
645: * all multicast IGMP packets, whether or not this
646: * host belongs to their destination groups.
647: */
648: if (ip->ip_p == IPPROTO_IGMP)
649: goto ours;
1.13 mycroft 650: ipstat.ips_forward++;
1.4 hpeyerl 651: }
652: #endif
653: /*
654: * See if we belong to the destination multicast group on the
655: * arrival interface.
656: */
657: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
658: if (inm == NULL) {
1.13 mycroft 659: ipstat.ips_cantforward++;
1.4 hpeyerl 660: m_freem(m);
1.89 itojun 661: return;
1.4 hpeyerl 662: }
663: goto ours;
664: }
1.19 mycroft 665: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 666: in_nullhost(ip->ip_dst))
1.1 cgd 667: goto ours;
668:
669: /*
670: * Not for us; forward if possible and desirable.
671: */
672: if (ipforwarding == 0) {
673: ipstat.ips_cantforward++;
674: m_freem(m);
1.100 itojun 675: } else {
676: /*
677: * If ip_dst matched any of my address on !IFF_UP interface,
678: * and there's no IFF_UP interface that matches ip_dst,
679: * send icmp unreach. Forwarding it will result in in-kernel
680: * forwarding loop till TTL goes to 0.
681: */
682: if (downmatch) {
683: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
684: ipstat.ips_cantforward++;
685: return;
686: }
1.1 cgd 687: ip_forward(m, 0);
1.100 itojun 688: }
1.89 itojun 689: return;
1.1 cgd 690:
691: ours:
692: /*
693: * If offset or IP_MF are set, must reassemble.
694: * Otherwise, nothing need be done.
695: * (We could look in the reassembly queue to see
696: * if the packet was previously fragmented,
697: * but it's not worth the time; just let them time out.)
698: */
1.37 perry 699: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 700: /*
701: * Look for queue of fragments
702: * of this datagram.
703: */
1.75 thorpej 704: IPQ_LOCK();
1.140 matt 705: LIST_FOREACH(fp, &ipq, ipq_q)
1.1 cgd 706: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 707: in_hosteq(ip->ip_src, fp->ipq_src) &&
708: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 709: ip->ip_p == fp->ipq_p)
710: goto found;
711: fp = 0;
712: found:
713:
714: /*
715: * Adjust ip_len to not reflect header,
1.25 cgd 716: * set ipqe_mff if more fragments are expected,
1.1 cgd 717: * convert offset of this to bytes.
718: */
719: ip->ip_len -= hlen;
1.25 cgd 720: mff = (ip->ip_off & IP_MF) != 0;
721: if (mff) {
1.16 cgd 722: /*
723: * Make sure that fragments have a data length
724: * that's a non-zero multiple of 8 bytes.
725: */
1.17 cgd 726: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 727: ipstat.ips_badfrags++;
1.75 thorpej 728: IPQ_UNLOCK();
1.16 cgd 729: goto bad;
730: }
731: }
1.1 cgd 732: ip->ip_off <<= 3;
733:
734: /*
735: * If datagram marked as having more fragments
736: * or if this is not the first fragment,
737: * attempt reassembly; if it succeeds, proceed.
738: */
1.25 cgd 739: if (mff || ip->ip_off) {
1.1 cgd 740: ipstat.ips_fragments++;
1.72 thorpej 741: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 742: if (ipqe == NULL) {
743: ipstat.ips_rcvmemdrop++;
1.75 thorpej 744: IPQ_UNLOCK();
1.25 cgd 745: goto bad;
746: }
747: ipqe->ipqe_mff = mff;
1.50 thorpej 748: ipqe->ipqe_m = m;
1.25 cgd 749: ipqe->ipqe_ip = ip;
1.50 thorpej 750: m = ip_reass(ipqe, fp);
1.75 thorpej 751: if (m == 0) {
752: IPQ_UNLOCK();
1.89 itojun 753: return;
1.75 thorpej 754: }
1.13 mycroft 755: ipstat.ips_reassembled++;
1.50 thorpej 756: ip = mtod(m, struct ip *);
1.74 thorpej 757: hlen = ip->ip_hl << 2;
1.79 mycroft 758: ip->ip_len += hlen;
1.1 cgd 759: } else
760: if (fp)
761: ip_freef(fp);
1.75 thorpej 762: IPQ_UNLOCK();
1.79 mycroft 763: }
1.128 itojun 764:
765: #ifdef IPSEC
766: /*
767: * enforce IPsec policy checking if we are seeing last header.
768: * note that we do not visit this with protocols with pcb layer
769: * code - like udp/tcp/raw ip.
770: */
771: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
772: ipsec4_in_reject(m, NULL)) {
773: ipsecstat.in_polvio++;
774: goto bad;
775: }
776: #endif
1.1 cgd 777:
778: /*
779: * Switch out to protocol's input routine.
780: */
1.82 aidan 781: #if IFA_STATS
1.122 itojun 782: if (ia && ip)
783: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 784: #endif
1.1 cgd 785: ipstat.ips_delivered++;
1.89 itojun 786: {
787: int off = hlen, nh = ip->ip_p;
788:
789: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
790: return;
791: }
1.1 cgd 792: bad:
793: m_freem(m);
1.135 thorpej 794: return;
795:
796: badcsum:
797: ipstat.ips_badsum++;
798: m_freem(m);
1.1 cgd 799: }
800:
801: /*
802: * Take incoming datagram fragment and try to
803: * reassemble it into whole datagram. If a chain for
804: * reassembly of this datagram already exists, then it
805: * is given as fp; otherwise have to make a chain.
806: */
1.50 thorpej 807: struct mbuf *
1.25 cgd 808: ip_reass(ipqe, fp)
1.109 augustss 809: struct ipqent *ipqe;
810: struct ipq *fp;
1.1 cgd 811: {
1.109 augustss 812: struct mbuf *m = ipqe->ipqe_m;
813: struct ipqent *nq, *p, *q;
1.25 cgd 814: struct ip *ip;
1.1 cgd 815: struct mbuf *t;
1.25 cgd 816: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 817: int i, next;
818:
1.75 thorpej 819: IPQ_LOCK_CHECK();
820:
1.1 cgd 821: /*
822: * Presence of header sizes in mbufs
823: * would confuse code below.
824: */
825: m->m_data += hlen;
826: m->m_len -= hlen;
827:
828: /*
829: * If first fragment to arrive, create a reassembly queue.
830: */
831: if (fp == 0) {
1.131 itojun 832: /*
833: * Enforce upper bound on number of fragmented packets
834: * for which we attempt reassembly;
835: * If maxfrag is 0, never accept fragments.
836: * If maxfrag is -1, accept all fragments without limitation.
837: */
838: if (ip_maxfragpackets < 0)
839: ;
840: else if (ip_nfragpackets >= ip_maxfragpackets)
841: goto dropfrag;
842: ip_nfragpackets++;
1.50 thorpej 843: MALLOC(fp, struct ipq *, sizeof (struct ipq),
844: M_FTABLE, M_NOWAIT);
845: if (fp == NULL)
1.1 cgd 846: goto dropfrag;
1.25 cgd 847: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 848: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 849: fp->ipq_p = ipqe->ipqe_ip->ip_p;
850: fp->ipq_id = ipqe->ipqe_ip->ip_id;
851: LIST_INIT(&fp->ipq_fragq);
852: fp->ipq_src = ipqe->ipqe_ip->ip_src;
853: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
854: p = NULL;
1.1 cgd 855: goto insert;
856: }
857:
858: /*
859: * Find a segment which begins after this one does.
860: */
1.140 matt 861: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
862: p = q, q = LIST_NEXT(q, ipqe_q))
1.25 cgd 863: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 864: break;
865:
866: /*
867: * If there is a preceding segment, it may provide some of
868: * our data already. If so, drop the data from the incoming
869: * segment. If it provides all of our data, drop us.
870: */
1.25 cgd 871: if (p != NULL) {
872: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
873: ipqe->ipqe_ip->ip_off;
1.1 cgd 874: if (i > 0) {
1.25 cgd 875: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 876: goto dropfrag;
1.50 thorpej 877: m_adj(ipqe->ipqe_m, i);
1.25 cgd 878: ipqe->ipqe_ip->ip_off += i;
879: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 880: }
881: }
882:
883: /*
884: * While we overlap succeeding segments trim them or,
885: * if they are completely covered, dequeue them.
886: */
1.25 cgd 887: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
888: q->ipqe_ip->ip_off; q = nq) {
889: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
890: q->ipqe_ip->ip_off;
891: if (i < q->ipqe_ip->ip_len) {
892: q->ipqe_ip->ip_len -= i;
893: q->ipqe_ip->ip_off += i;
1.50 thorpej 894: m_adj(q->ipqe_m, i);
1.1 cgd 895: break;
896: }
1.140 matt 897: nq = LIST_NEXT(q, ipqe_q);
1.50 thorpej 898: m_freem(q->ipqe_m);
1.25 cgd 899: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 900: pool_put(&ipqent_pool, q);
1.1 cgd 901: }
902:
903: insert:
904: /*
905: * Stick new segment in its place;
906: * check for complete reassembly.
907: */
1.25 cgd 908: if (p == NULL) {
909: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
910: } else {
911: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
912: }
1.1 cgd 913: next = 0;
1.140 matt 914: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
915: p = q, q = LIST_NEXT(q, ipqe_q)) {
1.25 cgd 916: if (q->ipqe_ip->ip_off != next)
1.1 cgd 917: return (0);
1.25 cgd 918: next += q->ipqe_ip->ip_len;
1.1 cgd 919: }
1.25 cgd 920: if (p->ipqe_mff)
1.1 cgd 921: return (0);
922:
923: /*
1.41 thorpej 924: * Reassembly is complete. Check for a bogus message size and
925: * concatenate fragments.
1.1 cgd 926: */
1.140 matt 927: q = LIST_FIRST(&fp->ipq_fragq);
1.25 cgd 928: ip = q->ipqe_ip;
1.41 thorpej 929: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
930: ipstat.ips_toolong++;
931: ip_freef(fp);
932: return (0);
933: }
1.50 thorpej 934: m = q->ipqe_m;
1.1 cgd 935: t = m->m_next;
936: m->m_next = 0;
937: m_cat(m, t);
1.140 matt 938: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 939: pool_put(&ipqent_pool, q);
1.25 cgd 940: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 941: t = q->ipqe_m;
1.140 matt 942: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 943: pool_put(&ipqent_pool, q);
1.1 cgd 944: m_cat(m, t);
945: }
946:
947: /*
948: * Create header for new ip packet by
949: * modifying header of first packet;
950: * dequeue and discard fragment reassembly header.
951: * Make header visible.
952: */
953: ip->ip_len = next;
1.25 cgd 954: ip->ip_src = fp->ipq_src;
955: ip->ip_dst = fp->ipq_dst;
956: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 957: FREE(fp, M_FTABLE);
1.131 itojun 958: ip_nfragpackets--;
1.1 cgd 959: m->m_len += (ip->ip_hl << 2);
960: m->m_data -= (ip->ip_hl << 2);
961: /* some debugging cruft by sklower, below, will go away soon */
962: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 963: int plen = 0;
1.50 thorpej 964: for (t = m; t; t = t->m_next)
965: plen += t->m_len;
966: m->m_pkthdr.len = plen;
1.1 cgd 967: }
1.50 thorpej 968: return (m);
1.1 cgd 969:
970: dropfrag:
971: ipstat.ips_fragdropped++;
972: m_freem(m);
1.72 thorpej 973: pool_put(&ipqent_pool, ipqe);
1.1 cgd 974: return (0);
975: }
976:
977: /*
978: * Free a fragment reassembly header and all
979: * associated datagrams.
980: */
1.8 mycroft 981: void
1.1 cgd 982: ip_freef(fp)
983: struct ipq *fp;
984: {
1.109 augustss 985: struct ipqent *q, *p;
1.1 cgd 986:
1.75 thorpej 987: IPQ_LOCK_CHECK();
988:
1.140 matt 989: for (q = LIST_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
990: p = LIST_NEXT(q, ipqe_q);
1.50 thorpej 991: m_freem(q->ipqe_m);
1.25 cgd 992: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 993: pool_put(&ipqent_pool, q);
1.1 cgd 994: }
1.25 cgd 995: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 996: FREE(fp, M_FTABLE);
1.131 itojun 997: ip_nfragpackets--;
1.1 cgd 998: }
999:
1000: /*
1001: * IP timer processing;
1002: * if a timer expires on a reassembly
1003: * queue, discard it.
1004: */
1.8 mycroft 1005: void
1.1 cgd 1006: ip_slowtimo()
1007: {
1.109 augustss 1008: struct ipq *fp, *nfp;
1.24 mycroft 1009: int s = splsoftnet();
1.1 cgd 1010:
1.75 thorpej 1011: IPQ_LOCK();
1.140 matt 1012: for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
1013: nfp = LIST_NEXT(fp, ipq_q);
1.25 cgd 1014: if (--fp->ipq_ttl == 0) {
1.1 cgd 1015: ipstat.ips_fragtimeout++;
1.25 cgd 1016: ip_freef(fp);
1.1 cgd 1017: }
1018: }
1.131 itojun 1019: /*
1020: * If we are over the maximum number of fragments
1021: * (due to the limit being lowered), drain off
1022: * enough to get down to the new limit.
1023: */
1024: if (ip_maxfragpackets < 0)
1025: ;
1026: else {
1.140 matt 1027: while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
1028: ip_freef(LIST_FIRST(&ipq));
1.131 itojun 1029: }
1.75 thorpej 1030: IPQ_UNLOCK();
1.63 matt 1031: #ifdef GATEWAY
1032: ipflow_slowtimo();
1033: #endif
1.1 cgd 1034: splx(s);
1035: }
1036:
1037: /*
1038: * Drain off all datagram fragments.
1039: */
1.8 mycroft 1040: void
1.1 cgd 1041: ip_drain()
1042: {
1043:
1.75 thorpej 1044: /*
1045: * We may be called from a device's interrupt context. If
1046: * the ipq is already busy, just bail out now.
1047: */
1048: if (ipq_lock_try() == 0)
1049: return;
1050:
1.140 matt 1051: while (LIST_FIRST(&ipq) != NULL) {
1.1 cgd 1052: ipstat.ips_fragdropped++;
1.140 matt 1053: ip_freef(LIST_FIRST(&ipq));
1.1 cgd 1054: }
1.75 thorpej 1055:
1056: IPQ_UNLOCK();
1.1 cgd 1057: }
1058:
1059: /*
1060: * Do option processing on a datagram,
1061: * possibly discarding it if bad options are encountered,
1062: * or forwarding it if source-routed.
1063: * Returns 1 if packet has been forwarded/freed,
1064: * 0 if the packet should be processed further.
1065: */
1.8 mycroft 1066: int
1.1 cgd 1067: ip_dooptions(m)
1068: struct mbuf *m;
1069: {
1.109 augustss 1070: struct ip *ip = mtod(m, struct ip *);
1071: u_char *cp, *cp0;
1072: struct ip_timestamp *ipt;
1073: struct in_ifaddr *ia;
1.1 cgd 1074: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1075: struct in_addr dst;
1.1 cgd 1076: n_time ntime;
1077:
1.13 mycroft 1078: dst = ip->ip_dst;
1.1 cgd 1079: cp = (u_char *)(ip + 1);
1080: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1081: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1082: opt = cp[IPOPT_OPTVAL];
1083: if (opt == IPOPT_EOL)
1084: break;
1085: if (opt == IPOPT_NOP)
1086: optlen = 1;
1087: else {
1.113 itojun 1088: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1089: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1090: goto bad;
1091: }
1.1 cgd 1092: optlen = cp[IPOPT_OLEN];
1.114 itojun 1093: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1094: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1095: goto bad;
1096: }
1097: }
1098: switch (opt) {
1099:
1100: default:
1101: break;
1102:
1103: /*
1104: * Source routing with record.
1105: * Find interface with current destination address.
1106: * If none on this machine then drop if strictly routed,
1107: * or do nothing if loosely routed.
1108: * Record interface address and bring up next address
1109: * component. If strictly routed make sure next
1110: * address is on directly accessible net.
1111: */
1112: case IPOPT_LSRR:
1113: case IPOPT_SSRR:
1.47 cjs 1114: if (ip_allowsrcrt == 0) {
1115: type = ICMP_UNREACH;
1116: code = ICMP_UNREACH_NET_PROHIB;
1117: goto bad;
1118: }
1.114 itojun 1119: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1120: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1121: goto bad;
1122: }
1.1 cgd 1123: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1124: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1125: goto bad;
1126: }
1127: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1128: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1129: if (ia == 0) {
1130: if (opt == IPOPT_SSRR) {
1131: type = ICMP_UNREACH;
1132: code = ICMP_UNREACH_SRCFAIL;
1133: goto bad;
1134: }
1135: /*
1136: * Loose routing, and not at next destination
1137: * yet; nothing to do except forward.
1138: */
1139: break;
1140: }
1141: off--; /* 0 origin */
1.112 sommerfe 1142: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1143: /*
1144: * End of source route. Should be for us.
1145: */
1146: save_rte(cp, ip->ip_src);
1147: break;
1148: }
1149: /*
1150: * locate outgoing interface
1151: */
1152: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1153: sizeof(ipaddr.sin_addr));
1.96 thorpej 1154: if (opt == IPOPT_SSRR)
1155: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1156: else
1.1 cgd 1157: ia = ip_rtaddr(ipaddr.sin_addr);
1158: if (ia == 0) {
1159: type = ICMP_UNREACH;
1160: code = ICMP_UNREACH_SRCFAIL;
1161: goto bad;
1162: }
1163: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1164: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1165: (caddr_t)(cp + off), sizeof(struct in_addr));
1166: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1167: /*
1168: * Let ip_intr's mcast routing check handle mcast pkts
1169: */
1.18 mycroft 1170: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1171: break;
1172:
1173: case IPOPT_RR:
1.114 itojun 1174: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1175: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1176: goto bad;
1177: }
1.1 cgd 1178: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1179: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1180: goto bad;
1181: }
1182: /*
1183: * If no space remains, ignore.
1184: */
1185: off--; /* 0 origin */
1.112 sommerfe 1186: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1187: break;
1188: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1189: sizeof(ipaddr.sin_addr));
1190: /*
1191: * locate outgoing interface; if we're the destination,
1192: * use the incoming interface (should be same).
1193: */
1.96 thorpej 1194: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1195: == NULL &&
1196: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1197: type = ICMP_UNREACH;
1198: code = ICMP_UNREACH_HOST;
1199: goto bad;
1200: }
1.20 mycroft 1201: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1202: (caddr_t)(cp + off), sizeof(struct in_addr));
1203: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1204: break;
1205:
1206: case IPOPT_TS:
1207: code = cp - (u_char *)ip;
1208: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1209: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1210: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1211: goto bad;
1.114 itojun 1212: }
1213: if (ipt->ipt_ptr < 5) {
1214: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1215: goto bad;
1216: }
1.15 cgd 1217: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1218: if (++ipt->ipt_oflw == 0) {
1219: code = (u_char *)&ipt->ipt_ptr -
1220: (u_char *)ip;
1.1 cgd 1221: goto bad;
1.114 itojun 1222: }
1.1 cgd 1223: break;
1224: }
1.104 thorpej 1225: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1226: switch (ipt->ipt_flg) {
1227:
1228: case IPOPT_TS_TSONLY:
1229: break;
1230:
1231: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1232: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1233: sizeof(struct in_addr) > ipt->ipt_len) {
1234: code = (u_char *)&ipt->ipt_ptr -
1235: (u_char *)ip;
1.1 cgd 1236: goto bad;
1.114 itojun 1237: }
1.13 mycroft 1238: ipaddr.sin_addr = dst;
1.96 thorpej 1239: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1240: m->m_pkthdr.rcvif));
1.13 mycroft 1241: if (ia == 0)
1242: continue;
1.104 thorpej 1243: bcopy(&ia->ia_addr.sin_addr,
1244: cp0, sizeof(struct in_addr));
1.1 cgd 1245: ipt->ipt_ptr += sizeof(struct in_addr);
1246: break;
1247:
1248: case IPOPT_TS_PRESPEC:
1.66 thorpej 1249: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1250: sizeof(struct in_addr) > ipt->ipt_len) {
1251: code = (u_char *)&ipt->ipt_ptr -
1252: (u_char *)ip;
1.1 cgd 1253: goto bad;
1.114 itojun 1254: }
1.104 thorpej 1255: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1256: sizeof(struct in_addr));
1.96 thorpej 1257: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1258: == NULL)
1.1 cgd 1259: continue;
1260: ipt->ipt_ptr += sizeof(struct in_addr);
1261: break;
1262:
1263: default:
1.114 itojun 1264: /* XXX can't take &ipt->ipt_flg */
1265: code = (u_char *)&ipt->ipt_ptr -
1266: (u_char *)ip + 1;
1.1 cgd 1267: goto bad;
1268: }
1269: ntime = iptime();
1.107 thorpej 1270: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1271: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1272: sizeof(n_time));
1273: ipt->ipt_ptr += sizeof(n_time);
1274: }
1275: }
1276: if (forward) {
1.26 thorpej 1277: if (ip_forwsrcrt == 0) {
1278: type = ICMP_UNREACH;
1279: code = ICMP_UNREACH_SRCFAIL;
1280: goto bad;
1281: }
1.1 cgd 1282: ip_forward(m, 1);
1283: return (1);
1.13 mycroft 1284: }
1285: return (0);
1.1 cgd 1286: bad:
1.13 mycroft 1287: icmp_error(m, type, code, 0, 0);
1288: ipstat.ips_badoptions++;
1.1 cgd 1289: return (1);
1290: }
1291:
1292: /*
1293: * Given address of next destination (final or next hop),
1294: * return internet address info of interface to be used to get there.
1295: */
1296: struct in_ifaddr *
1297: ip_rtaddr(dst)
1298: struct in_addr dst;
1299: {
1.109 augustss 1300: struct sockaddr_in *sin;
1.1 cgd 1301:
1.19 mycroft 1302: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1303:
1.35 mycroft 1304: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1305: if (ipforward_rt.ro_rt) {
1306: RTFREE(ipforward_rt.ro_rt);
1307: ipforward_rt.ro_rt = 0;
1308: }
1309: sin->sin_family = AF_INET;
1310: sin->sin_len = sizeof(*sin);
1311: sin->sin_addr = dst;
1312:
1313: rtalloc(&ipforward_rt);
1314: }
1315: if (ipforward_rt.ro_rt == 0)
1316: return ((struct in_ifaddr *)0);
1.19 mycroft 1317: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1318: }
1319:
1320: /*
1321: * Save incoming source route for use in replies,
1322: * to be picked up later by ip_srcroute if the receiver is interested.
1323: */
1.13 mycroft 1324: void
1.1 cgd 1325: save_rte(option, dst)
1326: u_char *option;
1327: struct in_addr dst;
1328: {
1329: unsigned olen;
1330:
1331: olen = option[IPOPT_OLEN];
1332: #ifdef DIAGNOSTIC
1333: if (ipprintfs)
1.39 christos 1334: printf("save_rte: olen %d\n", olen);
1.89 itojun 1335: #endif /* 0 */
1.1 cgd 1336: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1337: return;
1338: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1339: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1340: ip_srcrt.dst = dst;
1341: }
1342:
1343: /*
1344: * Retrieve incoming source route for use in replies,
1345: * in the same form used by setsockopt.
1346: * The first hop is placed before the options, will be removed later.
1347: */
1348: struct mbuf *
1349: ip_srcroute()
1350: {
1.109 augustss 1351: struct in_addr *p, *q;
1352: struct mbuf *m;
1.1 cgd 1353:
1354: if (ip_nhops == 0)
1355: return ((struct mbuf *)0);
1356: m = m_get(M_DONTWAIT, MT_SOOPTS);
1357: if (m == 0)
1358: return ((struct mbuf *)0);
1359:
1.13 mycroft 1360: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1361:
1362: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1363: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1364: OPTSIZ;
1365: #ifdef DIAGNOSTIC
1366: if (ipprintfs)
1.39 christos 1367: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1368: #endif
1369:
1370: /*
1371: * First save first hop for return route
1372: */
1373: p = &ip_srcrt.route[ip_nhops - 1];
1374: *(mtod(m, struct in_addr *)) = *p--;
1375: #ifdef DIAGNOSTIC
1376: if (ipprintfs)
1.39 christos 1377: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1378: #endif
1379:
1380: /*
1381: * Copy option fields and padding (nop) to mbuf.
1382: */
1383: ip_srcrt.nop = IPOPT_NOP;
1384: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1385: bcopy((caddr_t)&ip_srcrt.nop,
1386: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1387: q = (struct in_addr *)(mtod(m, caddr_t) +
1388: sizeof(struct in_addr) + OPTSIZ);
1389: #undef OPTSIZ
1390: /*
1391: * Record return path as an IP source route,
1392: * reversing the path (pointers are now aligned).
1393: */
1394: while (p >= ip_srcrt.route) {
1395: #ifdef DIAGNOSTIC
1396: if (ipprintfs)
1.39 christos 1397: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1398: #endif
1399: *q++ = *p--;
1400: }
1401: /*
1402: * Last hop goes to final destination.
1403: */
1404: *q = ip_srcrt.dst;
1405: #ifdef DIAGNOSTIC
1406: if (ipprintfs)
1.39 christos 1407: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1408: #endif
1409: return (m);
1410: }
1411:
1412: /*
1413: * Strip out IP options, at higher
1414: * level protocol in the kernel.
1415: * Second argument is buffer to which options
1416: * will be moved, and return value is their length.
1417: * XXX should be deleted; last arg currently ignored.
1418: */
1.8 mycroft 1419: void
1.1 cgd 1420: ip_stripoptions(m, mopt)
1.109 augustss 1421: struct mbuf *m;
1.1 cgd 1422: struct mbuf *mopt;
1423: {
1.109 augustss 1424: int i;
1.1 cgd 1425: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1426: caddr_t opts;
1.1 cgd 1427: int olen;
1428:
1.79 mycroft 1429: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1430: opts = (caddr_t)(ip + 1);
1431: i = m->m_len - (sizeof (struct ip) + olen);
1432: bcopy(opts + olen, opts, (unsigned)i);
1433: m->m_len -= olen;
1434: if (m->m_flags & M_PKTHDR)
1435: m->m_pkthdr.len -= olen;
1.79 mycroft 1436: ip->ip_len -= olen;
1437: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1438: }
1439:
1.139 matt 1440: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1441: 0, 0, 0, 0,
1442: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1443: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1444: EMSGSIZE, EHOSTUNREACH, 0, 0,
1445: 0, 0, 0, 0,
1446: ENOPROTOOPT
1447: };
1448:
1449: /*
1450: * Forward a packet. If some error occurs return the sender
1451: * an icmp packet. Note we can't always generate a meaningful
1452: * icmp message because icmp doesn't have a large enough repertoire
1453: * of codes and types.
1454: *
1455: * If not forwarding, just drop the packet. This could be confusing
1456: * if ipforwarding was zero but some routing protocol was advancing
1457: * us as a gateway to somewhere. However, we must let the routing
1458: * protocol deal with that.
1459: *
1460: * The srcrt parameter indicates whether the packet is being forwarded
1461: * via a source route.
1462: */
1.13 mycroft 1463: void
1.1 cgd 1464: ip_forward(m, srcrt)
1465: struct mbuf *m;
1466: int srcrt;
1467: {
1.109 augustss 1468: struct ip *ip = mtod(m, struct ip *);
1469: struct sockaddr_in *sin;
1470: struct rtentry *rt;
1.28 christos 1471: int error, type = 0, code = 0;
1.1 cgd 1472: struct mbuf *mcopy;
1.13 mycroft 1473: n_long dest;
1474: struct ifnet *destifp;
1.89 itojun 1475: #ifdef IPSEC
1476: struct ifnet dummyifp;
1477: #endif
1.135 thorpej 1478:
1479: /*
1480: * Clear any in-bound checksum flags for this packet.
1481: */
1482: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1483:
1.13 mycroft 1484: dest = 0;
1.1 cgd 1485: #ifdef DIAGNOSTIC
1486: if (ipprintfs)
1.70 thorpej 1487: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1488: ntohl(ip->ip_src.s_addr),
1489: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1490: #endif
1.93 sommerfe 1491: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1492: ipstat.ips_cantforward++;
1493: m_freem(m);
1494: return;
1495: }
1496: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1497: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1498: return;
1499: }
1500: ip->ip_ttl -= IPTTLDEC;
1501:
1.19 mycroft 1502: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1503: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1504: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1505: if (ipforward_rt.ro_rt) {
1506: RTFREE(ipforward_rt.ro_rt);
1507: ipforward_rt.ro_rt = 0;
1508: }
1509: sin->sin_family = AF_INET;
1.35 mycroft 1510: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1511: sin->sin_addr = ip->ip_dst;
1512:
1513: rtalloc(&ipforward_rt);
1514: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1515: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1516: return;
1517: }
1518: rt = ipforward_rt.ro_rt;
1519: }
1520:
1521: /*
1.34 mycroft 1522: * Save at most 68 bytes of the packet in case
1.1 cgd 1523: * we need to generate an ICMP message to the src.
1.119 itojun 1524: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1525: */
1.119 itojun 1526: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1527: if (mcopy)
1528: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1529:
1530: /*
1531: * If forwarding packet using same interface that it came in on,
1532: * perhaps should send a redirect to sender to shortcut a hop.
1533: * Only send redirect if source is sending directly to us,
1534: * and if packet was not source routed (or has any options).
1535: * Also, don't send redirect if forwarding using a default route
1536: * or a route modified by a redirect.
1537: */
1538: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1539: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1540: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1541: ipsendredirects && !srcrt) {
1.19 mycroft 1542: if (rt->rt_ifa &&
1543: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1544: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1545: if (rt->rt_flags & RTF_GATEWAY)
1546: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1547: else
1548: dest = ip->ip_dst.s_addr;
1549: /*
1550: * Router requirements says to only send host
1551: * redirects.
1552: */
1553: type = ICMP_REDIRECT;
1554: code = ICMP_REDIRECT_HOST;
1.1 cgd 1555: #ifdef DIAGNOSTIC
1.77 thorpej 1556: if (ipprintfs)
1557: printf("redirect (%d) to %x\n", code,
1558: (u_int32_t)dest);
1.1 cgd 1559: #endif
1560: }
1561: }
1562:
1.89 itojun 1563: #ifdef IPSEC
1.134 lukem 1564: /* Don't lookup socket in forwarding case */
1.127 itojun 1565: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1566: #endif
1.27 thorpej 1567: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1568: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1569: if (error)
1570: ipstat.ips_cantforward++;
1571: else {
1572: ipstat.ips_forward++;
1573: if (type)
1574: ipstat.ips_redirectsent++;
1575: else {
1.63 matt 1576: if (mcopy) {
1577: #ifdef GATEWAY
1.64 thorpej 1578: if (mcopy->m_flags & M_CANFASTFWD)
1579: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1580: #endif
1.1 cgd 1581: m_freem(mcopy);
1.63 matt 1582: }
1.1 cgd 1583: return;
1584: }
1585: }
1586: if (mcopy == NULL)
1587: return;
1.13 mycroft 1588: destifp = NULL;
1589:
1.1 cgd 1590: switch (error) {
1591:
1592: case 0: /* forwarded, but need redirect */
1593: /* type, code set above */
1594: break;
1595:
1596: case ENETUNREACH: /* shouldn't happen, checked above */
1597: case EHOSTUNREACH:
1598: case ENETDOWN:
1599: case EHOSTDOWN:
1600: default:
1601: type = ICMP_UNREACH;
1602: code = ICMP_UNREACH_HOST;
1603: break;
1604:
1605: case EMSGSIZE:
1606: type = ICMP_UNREACH;
1607: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1608: #ifndef IPSEC
1.13 mycroft 1609: if (ipforward_rt.ro_rt)
1610: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1611: #else
1612: /*
1613: * If the packet is routed over IPsec tunnel, tell the
1614: * originator the tunnel MTU.
1615: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1616: * XXX quickhack!!!
1617: */
1618: if (ipforward_rt.ro_rt) {
1619: struct secpolicy *sp;
1620: int ipsecerror;
1.95 itojun 1621: size_t ipsechdr;
1.89 itojun 1622: struct route *ro;
1623:
1624: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1625: IPSEC_DIR_OUTBOUND,
1626: IP_FORWARDING,
1627: &ipsecerror);
1.89 itojun 1628:
1629: if (sp == NULL)
1630: destifp = ipforward_rt.ro_rt->rt_ifp;
1631: else {
1632: /* count IPsec header size */
1.95 itojun 1633: ipsechdr = ipsec4_hdrsiz(mcopy,
1634: IPSEC_DIR_OUTBOUND,
1635: NULL);
1.89 itojun 1636:
1637: /*
1638: * find the correct route for outer IPv4
1639: * header, compute tunnel MTU.
1640: *
1641: * XXX BUG ALERT
1642: * The "dummyifp" code relies upon the fact
1643: * that icmp_error() touches only ifp->if_mtu.
1644: */
1645: /*XXX*/
1646: destifp = NULL;
1647: if (sp->req != NULL
1.95 itojun 1648: && sp->req->sav != NULL
1649: && sp->req->sav->sah != NULL) {
1650: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1651: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1652: dummyifp.if_mtu =
1653: ro->ro_rt->rt_ifp->if_mtu;
1654: dummyifp.if_mtu -= ipsechdr;
1655: destifp = &dummyifp;
1656: }
1657: }
1658:
1659: key_freesp(sp);
1660: }
1661: }
1662: #endif /*IPSEC*/
1.1 cgd 1663: ipstat.ips_cantfrag++;
1664: break;
1665:
1666: case ENOBUFS:
1667: type = ICMP_SOURCEQUENCH;
1668: code = 0;
1669: break;
1670: }
1.13 mycroft 1671: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1672: }
1673:
1674: void
1675: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1676: struct inpcb *inp;
1677: struct mbuf **mp;
1678: struct ip *ip;
1679: struct mbuf *m;
1.44 thorpej 1680: {
1681:
1682: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1683: struct timeval tv;
1684:
1685: microtime(&tv);
1686: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1687: SCM_TIMESTAMP, SOL_SOCKET);
1688: if (*mp)
1689: mp = &(*mp)->m_next;
1690: }
1691: if (inp->inp_flags & INP_RECVDSTADDR) {
1692: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1693: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1694: if (*mp)
1695: mp = &(*mp)->m_next;
1696: }
1697: #ifdef notyet
1698: /*
1699: * XXX
1700: * Moving these out of udp_input() made them even more broken
1701: * than they already were.
1702: * - fenner@parc.xerox.com
1703: */
1704: /* options were tossed already */
1705: if (inp->inp_flags & INP_RECVOPTS) {
1706: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1707: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1708: if (*mp)
1709: mp = &(*mp)->m_next;
1710: }
1711: /* ip_srcroute doesn't do what we want here, need to fix */
1712: if (inp->inp_flags & INP_RECVRETOPTS) {
1713: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1714: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1715: if (*mp)
1716: mp = &(*mp)->m_next;
1717: }
1718: #endif
1719: if (inp->inp_flags & INP_RECVIF) {
1720: struct sockaddr_dl sdl;
1721:
1722: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1723: sdl.sdl_family = AF_LINK;
1724: sdl.sdl_index = m->m_pkthdr.rcvif ?
1725: m->m_pkthdr.rcvif->if_index : 0;
1726: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1727: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1728: IP_RECVIF, IPPROTO_IP);
1729: if (*mp)
1730: mp = &(*mp)->m_next;
1731: }
1.13 mycroft 1732: }
1733:
1734: int
1735: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1736: int *name;
1737: u_int namelen;
1738: void *oldp;
1739: size_t *oldlenp;
1740: void *newp;
1741: size_t newlen;
1742: {
1.88 sommerfe 1743: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1744:
1.54 lukem 1745: int error, old;
1746:
1.13 mycroft 1747: /* All sysctl names at this level are terminal. */
1748: if (namelen != 1)
1749: return (ENOTDIR);
1750:
1751: switch (name[0]) {
1752: case IPCTL_FORWARDING:
1753: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1754: case IPCTL_SENDREDIRECTS:
1755: return (sysctl_int(oldp, oldlenp, newp, newlen,
1756: &ipsendredirects));
1757: case IPCTL_DEFTTL:
1758: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1759: #ifdef notyet
1760: case IPCTL_DEFMTU:
1761: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1762: #endif
1.26 thorpej 1763: case IPCTL_FORWSRCRT:
1.47 cjs 1764: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1765: if (securelevel > 0)
1.46 cjs 1766: return (sysctl_rdint(oldp, oldlenp, newp,
1767: ip_forwsrcrt));
1768: else
1769: return (sysctl_int(oldp, oldlenp, newp, newlen,
1770: &ip_forwsrcrt));
1.27 thorpej 1771: case IPCTL_DIRECTEDBCAST:
1772: return (sysctl_int(oldp, oldlenp, newp, newlen,
1773: &ip_directedbcast));
1.47 cjs 1774: case IPCTL_ALLOWSRCRT:
1775: return (sysctl_int(oldp, oldlenp, newp, newlen,
1776: &ip_allowsrcrt));
1.52 thorpej 1777: case IPCTL_SUBNETSARELOCAL:
1778: return (sysctl_int(oldp, oldlenp, newp, newlen,
1779: &subnetsarelocal));
1.53 kml 1780: case IPCTL_MTUDISC:
1.60 kml 1781: error = sysctl_int(oldp, oldlenp, newp, newlen,
1782: &ip_mtudisc);
1783: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1784: ip_mtudisc_timeout_q =
1785: rt_timer_queue_create(ip_mtudisc_timeout);
1786: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1787: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1788: ip_mtudisc_timeout_q = NULL;
1789: }
1790: return error;
1.54 lukem 1791: case IPCTL_ANONPORTMIN:
1792: old = anonportmin;
1793: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1794: if (anonportmin >= anonportmax || anonportmin < 0
1795: || anonportmin > 65535
1.54 lukem 1796: #ifndef IPNOPRIVPORTS
1797: || anonportmin < IPPORT_RESERVED
1798: #endif
1799: ) {
1800: anonportmin = old;
1801: return (EINVAL);
1802: }
1803: return (error);
1804: case IPCTL_ANONPORTMAX:
1805: old = anonportmax;
1806: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1807: if (anonportmin >= anonportmax || anonportmax < 0
1808: || anonportmax > 65535
1.54 lukem 1809: #ifndef IPNOPRIVPORTS
1810: || anonportmax < IPPORT_RESERVED
1811: #endif
1812: ) {
1813: anonportmax = old;
1814: return (EINVAL);
1815: }
1.60 kml 1816: return (error);
1817: case IPCTL_MTUDISCTIMEOUT:
1818: error = sysctl_int(oldp, oldlenp, newp, newlen,
1819: &ip_mtudisc_timeout);
1820: if (ip_mtudisc_timeout_q != NULL)
1821: rt_timer_queue_change(ip_mtudisc_timeout_q,
1822: ip_mtudisc_timeout);
1.54 lukem 1823: return (error);
1.65 matt 1824: #ifdef GATEWAY
1825: case IPCTL_MAXFLOWS:
1.67 thorpej 1826: {
1827: int s;
1828:
1.65 matt 1829: error = sysctl_int(oldp, oldlenp, newp, newlen,
1830: &ip_maxflows);
1.67 thorpej 1831: s = splsoftnet();
1.65 matt 1832: ipflow_reap(0);
1.67 thorpej 1833: splx(s);
1.65 matt 1834: return (error);
1.67 thorpej 1835: }
1.89 itojun 1836: #endif
1.90 itojun 1837: case IPCTL_HOSTZEROBROADCAST:
1838: return (sysctl_int(oldp, oldlenp, newp, newlen,
1839: &hostzeroisbroadcast));
1.89 itojun 1840: #if NGIF > 0
1841: case IPCTL_GIF_TTL:
1842: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1843: &ip_gif_ttl));
1.117 tron 1844: #endif
1845:
1846: #ifndef IPNOPRIVPORTS
1847: case IPCTL_LOWPORTMIN:
1848: old = lowportmin;
1849: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1850: if (lowportmin >= lowportmax
1851: || lowportmin > IPPORT_RESERVEDMAX
1852: || lowportmin < IPPORT_RESERVEDMIN
1853: ) {
1854: lowportmin = old;
1855: return (EINVAL);
1856: }
1857: return (error);
1858: case IPCTL_LOWPORTMAX:
1859: old = lowportmax;
1860: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1861: if (lowportmin >= lowportmax
1862: || lowportmax > IPPORT_RESERVEDMAX
1863: || lowportmax < IPPORT_RESERVEDMIN
1864: ) {
1865: lowportmax = old;
1866: return (EINVAL);
1867: }
1868: return (error);
1.65 matt 1869: #endif
1.131 itojun 1870:
1871: case IPCTL_MAXFRAGPACKETS:
1872: return (sysctl_int(oldp, oldlenp, newp, newlen,
1873: &ip_maxfragpackets));
1.88 sommerfe 1874:
1.13 mycroft 1875: default:
1876: return (EOPNOTSUPP);
1877: }
1878: /* NOTREACHED */
1.1 cgd 1879: }
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