Annotation of src/sys/netinet/ip_input.c, Revision 1.130.2.6
1.130.2.6! nathanw 1: /* $NetBSD: ip_input.c,v 1.130.2.5 2001/11/14 19:17:49 nathanw Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.55 scottr 103:
1.130.2.5 nathanw 104: #include <sys/cdefs.h>
1.130.2.6! nathanw 105: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.130.2.5 2001/11/14 19:17:49 nathanw Exp $");
1.130.2.5 nathanw 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"
1.130.2.2 nathanw 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;
1.130.2.1 nathanw 214: int ip_nfragpackets = 0;
1.130.2.2 nathanw 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:
1.130.2.2 nathanw 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:
1.130.2.2 nathanw 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:
1.130.2.2 nathanw 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 */
1.130.2.2 nathanw 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) {
1.130.2.2 nathanw 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: */
1.130.2.5 nathanw 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:
1.130.2.2 nathanw 460: switch (m->m_pkthdr.csum_flags &
1.130.2.4 nathanw 461: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.130.2.2 nathanw 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
1.130.2.3 nathanw 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 *);
1.130.2.6! nathanw 544: hlen = ip->ip_hl << 2;
1.127 itojun 545: }
1.36 mrg 546: #endif /* PFIL_HOOKS */
1.123 thorpej 547:
548: #ifdef ALTQ
549: /* XXX Temporary until ALTQ is changed to use a pfil hook */
550: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
551: /* packet dropped by traffic conditioner */
552: return;
553: }
554: #endif
1.121 thorpej 555:
556: /*
557: * Convert fields to host representation.
558: */
559: NTOHS(ip->ip_len);
560: NTOHS(ip->ip_off);
1.33 mrg 561:
1.1 cgd 562: /*
563: * Process options and, if not destined for us,
564: * ship it on. ip_dooptions returns 1 when an
565: * error was detected (causing an icmp message
566: * to be sent and the original packet to be freed).
567: */
568: ip_nhops = 0; /* for source routed packets */
569: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 570: return;
1.1 cgd 571:
572: /*
573: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 574: *
575: * Traditional 4.4BSD did not consult IFF_UP at all.
576: * The behavior here is to treat addresses on !IFF_UP interface
577: * as not mine.
1.1 cgd 578: */
1.100 itojun 579: downmatch = 0;
1.130.2.5 nathanw 580: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 581: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
582: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
583: break;
1.100 itojun 584: else
585: downmatch++;
1.97 itojun 586: }
587: }
1.86 thorpej 588: if (ia != NULL)
589: goto ours;
1.57 tls 590: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.130.2.5 nathanw 591: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
592: if (ifa->ifa_addr->sa_family != AF_INET)
593: continue;
1.57 tls 594: ia = ifatoia(ifa);
1.35 mycroft 595: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
596: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 597: /*
598: * Look for all-0's host part (old broadcast addr),
599: * either for subnet or net.
600: */
601: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 602: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 603: goto ours;
1.57 tls 604: /*
605: * An interface with IP address zero accepts
606: * all packets that arrive on that interface.
607: */
608: if (in_nullhost(ia->ia_addr.sin_addr))
609: goto ours;
1.1 cgd 610: }
611: }
1.18 mycroft 612: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 613: struct in_multi *inm;
614: #ifdef MROUTING
615: extern struct socket *ip_mrouter;
1.10 brezak 616:
617: if (m->m_flags & M_EXT) {
618: if ((m = m_pullup(m, hlen)) == 0) {
619: ipstat.ips_toosmall++;
1.89 itojun 620: return;
1.10 brezak 621: }
622: ip = mtod(m, struct ip *);
623: }
1.4 hpeyerl 624:
625: if (ip_mrouter) {
626: /*
627: * If we are acting as a multicast router, all
628: * incoming multicast packets are passed to the
629: * kernel-level multicast forwarding function.
630: * The packet is returned (relatively) intact; if
631: * ip_mforward() returns a non-zero value, the packet
632: * must be discarded, else it may be accepted below.
633: *
634: * (The IP ident field is put in the same byte order
635: * as expected when ip_mforward() is called from
636: * ip_output().)
637: */
1.13 mycroft 638: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
639: ipstat.ips_cantforward++;
1.4 hpeyerl 640: m_freem(m);
1.89 itojun 641: return;
1.4 hpeyerl 642: }
643:
644: /*
645: * The process-level routing demon needs to receive
646: * all multicast IGMP packets, whether or not this
647: * host belongs to their destination groups.
648: */
649: if (ip->ip_p == IPPROTO_IGMP)
650: goto ours;
1.13 mycroft 651: ipstat.ips_forward++;
1.4 hpeyerl 652: }
653: #endif
654: /*
655: * See if we belong to the destination multicast group on the
656: * arrival interface.
657: */
658: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
659: if (inm == NULL) {
1.13 mycroft 660: ipstat.ips_cantforward++;
1.4 hpeyerl 661: m_freem(m);
1.89 itojun 662: return;
1.4 hpeyerl 663: }
664: goto ours;
665: }
1.19 mycroft 666: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 667: in_nullhost(ip->ip_dst))
1.1 cgd 668: goto ours;
669:
670: /*
671: * Not for us; forward if possible and desirable.
672: */
673: if (ipforwarding == 0) {
674: ipstat.ips_cantforward++;
675: m_freem(m);
1.100 itojun 676: } else {
677: /*
678: * If ip_dst matched any of my address on !IFF_UP interface,
679: * and there's no IFF_UP interface that matches ip_dst,
680: * send icmp unreach. Forwarding it will result in in-kernel
681: * forwarding loop till TTL goes to 0.
682: */
683: if (downmatch) {
684: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
685: ipstat.ips_cantforward++;
686: return;
687: }
1.1 cgd 688: ip_forward(m, 0);
1.100 itojun 689: }
1.89 itojun 690: return;
1.1 cgd 691:
692: ours:
693: /*
694: * If offset or IP_MF are set, must reassemble.
695: * Otherwise, nothing need be done.
696: * (We could look in the reassembly queue to see
697: * if the packet was previously fragmented,
698: * but it's not worth the time; just let them time out.)
699: */
1.37 perry 700: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 701: /*
702: * Look for queue of fragments
703: * of this datagram.
704: */
1.75 thorpej 705: IPQ_LOCK();
1.130.2.5 nathanw 706: LIST_FOREACH(fp, &ipq, ipq_q)
1.1 cgd 707: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 708: in_hosteq(ip->ip_src, fp->ipq_src) &&
709: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 710: ip->ip_p == fp->ipq_p)
711: goto found;
712: fp = 0;
713: found:
714:
715: /*
716: * Adjust ip_len to not reflect header,
1.25 cgd 717: * set ipqe_mff if more fragments are expected,
1.1 cgd 718: * convert offset of this to bytes.
719: */
720: ip->ip_len -= hlen;
1.25 cgd 721: mff = (ip->ip_off & IP_MF) != 0;
722: if (mff) {
1.16 cgd 723: /*
724: * Make sure that fragments have a data length
725: * that's a non-zero multiple of 8 bytes.
726: */
1.17 cgd 727: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 728: ipstat.ips_badfrags++;
1.75 thorpej 729: IPQ_UNLOCK();
1.16 cgd 730: goto bad;
731: }
732: }
1.1 cgd 733: ip->ip_off <<= 3;
734:
735: /*
736: * If datagram marked as having more fragments
737: * or if this is not the first fragment,
738: * attempt reassembly; if it succeeds, proceed.
739: */
1.25 cgd 740: if (mff || ip->ip_off) {
1.1 cgd 741: ipstat.ips_fragments++;
1.72 thorpej 742: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 743: if (ipqe == NULL) {
744: ipstat.ips_rcvmemdrop++;
1.75 thorpej 745: IPQ_UNLOCK();
1.25 cgd 746: goto bad;
747: }
748: ipqe->ipqe_mff = mff;
1.50 thorpej 749: ipqe->ipqe_m = m;
1.25 cgd 750: ipqe->ipqe_ip = ip;
1.50 thorpej 751: m = ip_reass(ipqe, fp);
1.75 thorpej 752: if (m == 0) {
753: IPQ_UNLOCK();
1.89 itojun 754: return;
1.75 thorpej 755: }
1.13 mycroft 756: ipstat.ips_reassembled++;
1.50 thorpej 757: ip = mtod(m, struct ip *);
1.74 thorpej 758: hlen = ip->ip_hl << 2;
1.79 mycroft 759: ip->ip_len += hlen;
1.1 cgd 760: } else
761: if (fp)
762: ip_freef(fp);
1.75 thorpej 763: IPQ_UNLOCK();
1.79 mycroft 764: }
1.128 itojun 765:
766: #ifdef IPSEC
767: /*
768: * enforce IPsec policy checking if we are seeing last header.
769: * note that we do not visit this with protocols with pcb layer
770: * code - like udp/tcp/raw ip.
771: */
772: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
773: ipsec4_in_reject(m, NULL)) {
774: ipsecstat.in_polvio++;
775: goto bad;
776: }
777: #endif
1.1 cgd 778:
779: /*
780: * Switch out to protocol's input routine.
781: */
1.82 aidan 782: #if IFA_STATS
1.122 itojun 783: if (ia && ip)
784: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 785: #endif
1.1 cgd 786: ipstat.ips_delivered++;
1.89 itojun 787: {
788: int off = hlen, nh = ip->ip_p;
789:
790: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
791: return;
792: }
1.1 cgd 793: bad:
794: m_freem(m);
1.130.2.2 nathanw 795: return;
796:
797: badcsum:
798: ipstat.ips_badsum++;
799: m_freem(m);
1.1 cgd 800: }
801:
802: /*
803: * Take incoming datagram fragment and try to
804: * reassemble it into whole datagram. If a chain for
805: * reassembly of this datagram already exists, then it
806: * is given as fp; otherwise have to make a chain.
807: */
1.50 thorpej 808: struct mbuf *
1.25 cgd 809: ip_reass(ipqe, fp)
1.109 augustss 810: struct ipqent *ipqe;
811: struct ipq *fp;
1.1 cgd 812: {
1.109 augustss 813: struct mbuf *m = ipqe->ipqe_m;
814: struct ipqent *nq, *p, *q;
1.25 cgd 815: struct ip *ip;
1.1 cgd 816: struct mbuf *t;
1.25 cgd 817: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 818: int i, next;
819:
1.75 thorpej 820: IPQ_LOCK_CHECK();
821:
1.1 cgd 822: /*
823: * Presence of header sizes in mbufs
824: * would confuse code below.
825: */
826: m->m_data += hlen;
827: m->m_len -= hlen;
828:
829: /*
830: * If first fragment to arrive, create a reassembly queue.
831: */
832: if (fp == 0) {
1.130.2.1 nathanw 833: /*
834: * Enforce upper bound on number of fragmented packets
835: * for which we attempt reassembly;
836: * If maxfrag is 0, never accept fragments.
837: * If maxfrag is -1, accept all fragments without limitation.
838: */
839: if (ip_maxfragpackets < 0)
840: ;
841: else if (ip_nfragpackets >= ip_maxfragpackets)
842: goto dropfrag;
843: ip_nfragpackets++;
1.50 thorpej 844: MALLOC(fp, struct ipq *, sizeof (struct ipq),
845: M_FTABLE, M_NOWAIT);
846: if (fp == NULL)
1.1 cgd 847: goto dropfrag;
1.25 cgd 848: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 849: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 850: fp->ipq_p = ipqe->ipqe_ip->ip_p;
851: fp->ipq_id = ipqe->ipqe_ip->ip_id;
852: LIST_INIT(&fp->ipq_fragq);
853: fp->ipq_src = ipqe->ipqe_ip->ip_src;
854: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
855: p = NULL;
1.1 cgd 856: goto insert;
857: }
858:
859: /*
860: * Find a segment which begins after this one does.
861: */
1.130.2.5 nathanw 862: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
863: p = q, q = LIST_NEXT(q, ipqe_q))
1.25 cgd 864: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 865: break;
866:
867: /*
868: * If there is a preceding segment, it may provide some of
869: * our data already. If so, drop the data from the incoming
870: * segment. If it provides all of our data, drop us.
871: */
1.25 cgd 872: if (p != NULL) {
873: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
874: ipqe->ipqe_ip->ip_off;
1.1 cgd 875: if (i > 0) {
1.25 cgd 876: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 877: goto dropfrag;
1.50 thorpej 878: m_adj(ipqe->ipqe_m, i);
1.25 cgd 879: ipqe->ipqe_ip->ip_off += i;
880: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 881: }
882: }
883:
884: /*
885: * While we overlap succeeding segments trim them or,
886: * if they are completely covered, dequeue them.
887: */
1.25 cgd 888: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
889: q->ipqe_ip->ip_off; q = nq) {
890: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
891: q->ipqe_ip->ip_off;
892: if (i < q->ipqe_ip->ip_len) {
893: q->ipqe_ip->ip_len -= i;
894: q->ipqe_ip->ip_off += i;
1.50 thorpej 895: m_adj(q->ipqe_m, i);
1.1 cgd 896: break;
897: }
1.130.2.5 nathanw 898: nq = LIST_NEXT(q, ipqe_q);
1.50 thorpej 899: m_freem(q->ipqe_m);
1.25 cgd 900: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 901: pool_put(&ipqent_pool, q);
1.1 cgd 902: }
903:
904: insert:
905: /*
906: * Stick new segment in its place;
907: * check for complete reassembly.
908: */
1.25 cgd 909: if (p == NULL) {
910: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
911: } else {
912: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
913: }
1.1 cgd 914: next = 0;
1.130.2.5 nathanw 915: for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL;
916: p = q, q = LIST_NEXT(q, ipqe_q)) {
1.25 cgd 917: if (q->ipqe_ip->ip_off != next)
1.1 cgd 918: return (0);
1.25 cgd 919: next += q->ipqe_ip->ip_len;
1.1 cgd 920: }
1.25 cgd 921: if (p->ipqe_mff)
1.1 cgd 922: return (0);
923:
924: /*
1.41 thorpej 925: * Reassembly is complete. Check for a bogus message size and
926: * concatenate fragments.
1.1 cgd 927: */
1.130.2.5 nathanw 928: q = LIST_FIRST(&fp->ipq_fragq);
1.25 cgd 929: ip = q->ipqe_ip;
1.41 thorpej 930: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
931: ipstat.ips_toolong++;
932: ip_freef(fp);
933: return (0);
934: }
1.50 thorpej 935: m = q->ipqe_m;
1.1 cgd 936: t = m->m_next;
937: m->m_next = 0;
938: m_cat(m, t);
1.130.2.5 nathanw 939: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 940: pool_put(&ipqent_pool, q);
1.25 cgd 941: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 942: t = q->ipqe_m;
1.130.2.5 nathanw 943: nq = LIST_NEXT(q, ipqe_q);
1.72 thorpej 944: pool_put(&ipqent_pool, q);
1.1 cgd 945: m_cat(m, t);
946: }
947:
948: /*
949: * Create header for new ip packet by
950: * modifying header of first packet;
951: * dequeue and discard fragment reassembly header.
952: * Make header visible.
953: */
954: ip->ip_len = next;
1.25 cgd 955: ip->ip_src = fp->ipq_src;
956: ip->ip_dst = fp->ipq_dst;
957: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 958: FREE(fp, M_FTABLE);
1.130.2.1 nathanw 959: ip_nfragpackets--;
1.1 cgd 960: m->m_len += (ip->ip_hl << 2);
961: m->m_data -= (ip->ip_hl << 2);
962: /* some debugging cruft by sklower, below, will go away soon */
963: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 964: int plen = 0;
1.50 thorpej 965: for (t = m; t; t = t->m_next)
966: plen += t->m_len;
967: m->m_pkthdr.len = plen;
1.1 cgd 968: }
1.50 thorpej 969: return (m);
1.1 cgd 970:
971: dropfrag:
972: ipstat.ips_fragdropped++;
973: m_freem(m);
1.72 thorpej 974: pool_put(&ipqent_pool, ipqe);
1.1 cgd 975: return (0);
976: }
977:
978: /*
979: * Free a fragment reassembly header and all
980: * associated datagrams.
981: */
1.8 mycroft 982: void
1.1 cgd 983: ip_freef(fp)
984: struct ipq *fp;
985: {
1.109 augustss 986: struct ipqent *q, *p;
1.1 cgd 987:
1.75 thorpej 988: IPQ_LOCK_CHECK();
989:
1.130.2.5 nathanw 990: for (q = LIST_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
991: p = LIST_NEXT(q, ipqe_q);
1.50 thorpej 992: m_freem(q->ipqe_m);
1.25 cgd 993: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 994: pool_put(&ipqent_pool, q);
1.1 cgd 995: }
1.25 cgd 996: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 997: FREE(fp, M_FTABLE);
1.130.2.1 nathanw 998: ip_nfragpackets--;
1.1 cgd 999: }
1000:
1001: /*
1002: * IP timer processing;
1003: * if a timer expires on a reassembly
1004: * queue, discard it.
1005: */
1.8 mycroft 1006: void
1.1 cgd 1007: ip_slowtimo()
1008: {
1.109 augustss 1009: struct ipq *fp, *nfp;
1.24 mycroft 1010: int s = splsoftnet();
1.1 cgd 1011:
1.75 thorpej 1012: IPQ_LOCK();
1.130.2.5 nathanw 1013: for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) {
1014: nfp = LIST_NEXT(fp, ipq_q);
1.25 cgd 1015: if (--fp->ipq_ttl == 0) {
1.1 cgd 1016: ipstat.ips_fragtimeout++;
1.25 cgd 1017: ip_freef(fp);
1.1 cgd 1018: }
1019: }
1.130.2.1 nathanw 1020: /*
1021: * If we are over the maximum number of fragments
1022: * (due to the limit being lowered), drain off
1023: * enough to get down to the new limit.
1024: */
1025: if (ip_maxfragpackets < 0)
1026: ;
1027: else {
1.130.2.5 nathanw 1028: while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq))
1029: ip_freef(LIST_FIRST(&ipq));
1.130.2.1 nathanw 1030: }
1.75 thorpej 1031: IPQ_UNLOCK();
1.63 matt 1032: #ifdef GATEWAY
1033: ipflow_slowtimo();
1034: #endif
1.1 cgd 1035: splx(s);
1036: }
1037:
1038: /*
1039: * Drain off all datagram fragments.
1040: */
1.8 mycroft 1041: void
1.1 cgd 1042: ip_drain()
1043: {
1044:
1.75 thorpej 1045: /*
1046: * We may be called from a device's interrupt context. If
1047: * the ipq is already busy, just bail out now.
1048: */
1049: if (ipq_lock_try() == 0)
1050: return;
1051:
1.130.2.5 nathanw 1052: while (LIST_FIRST(&ipq) != NULL) {
1.1 cgd 1053: ipstat.ips_fragdropped++;
1.130.2.5 nathanw 1054: ip_freef(LIST_FIRST(&ipq));
1.1 cgd 1055: }
1.75 thorpej 1056:
1057: IPQ_UNLOCK();
1.1 cgd 1058: }
1059:
1060: /*
1061: * Do option processing on a datagram,
1062: * possibly discarding it if bad options are encountered,
1063: * or forwarding it if source-routed.
1064: * Returns 1 if packet has been forwarded/freed,
1065: * 0 if the packet should be processed further.
1066: */
1.8 mycroft 1067: int
1.1 cgd 1068: ip_dooptions(m)
1069: struct mbuf *m;
1070: {
1.109 augustss 1071: struct ip *ip = mtod(m, struct ip *);
1072: u_char *cp, *cp0;
1073: struct ip_timestamp *ipt;
1074: struct in_ifaddr *ia;
1.1 cgd 1075: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1076: struct in_addr dst;
1.1 cgd 1077: n_time ntime;
1078:
1.13 mycroft 1079: dst = ip->ip_dst;
1.1 cgd 1080: cp = (u_char *)(ip + 1);
1081: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1082: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1083: opt = cp[IPOPT_OPTVAL];
1084: if (opt == IPOPT_EOL)
1085: break;
1086: if (opt == IPOPT_NOP)
1087: optlen = 1;
1088: else {
1.113 itojun 1089: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1090: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1091: goto bad;
1092: }
1.1 cgd 1093: optlen = cp[IPOPT_OLEN];
1.114 itojun 1094: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1095: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1096: goto bad;
1097: }
1098: }
1099: switch (opt) {
1100:
1101: default:
1102: break;
1103:
1104: /*
1105: * Source routing with record.
1106: * Find interface with current destination address.
1107: * If none on this machine then drop if strictly routed,
1108: * or do nothing if loosely routed.
1109: * Record interface address and bring up next address
1110: * component. If strictly routed make sure next
1111: * address is on directly accessible net.
1112: */
1113: case IPOPT_LSRR:
1114: case IPOPT_SSRR:
1.47 cjs 1115: if (ip_allowsrcrt == 0) {
1116: type = ICMP_UNREACH;
1117: code = ICMP_UNREACH_NET_PROHIB;
1118: goto bad;
1119: }
1.114 itojun 1120: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1121: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1122: goto bad;
1123: }
1.1 cgd 1124: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1125: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1126: goto bad;
1127: }
1128: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1129: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1130: if (ia == 0) {
1131: if (opt == IPOPT_SSRR) {
1132: type = ICMP_UNREACH;
1133: code = ICMP_UNREACH_SRCFAIL;
1134: goto bad;
1135: }
1136: /*
1137: * Loose routing, and not at next destination
1138: * yet; nothing to do except forward.
1139: */
1140: break;
1141: }
1142: off--; /* 0 origin */
1.112 sommerfe 1143: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1144: /*
1145: * End of source route. Should be for us.
1146: */
1147: save_rte(cp, ip->ip_src);
1148: break;
1149: }
1150: /*
1151: * locate outgoing interface
1152: */
1153: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1154: sizeof(ipaddr.sin_addr));
1.96 thorpej 1155: if (opt == IPOPT_SSRR)
1156: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1157: else
1.1 cgd 1158: ia = ip_rtaddr(ipaddr.sin_addr);
1159: if (ia == 0) {
1160: type = ICMP_UNREACH;
1161: code = ICMP_UNREACH_SRCFAIL;
1162: goto bad;
1163: }
1164: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1165: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1166: (caddr_t)(cp + off), sizeof(struct in_addr));
1167: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1168: /*
1169: * Let ip_intr's mcast routing check handle mcast pkts
1170: */
1.18 mycroft 1171: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1172: break;
1173:
1174: case IPOPT_RR:
1.114 itojun 1175: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1176: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1177: goto bad;
1178: }
1.1 cgd 1179: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1180: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1181: goto bad;
1182: }
1183: /*
1184: * If no space remains, ignore.
1185: */
1186: off--; /* 0 origin */
1.112 sommerfe 1187: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1188: break;
1189: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1190: sizeof(ipaddr.sin_addr));
1191: /*
1192: * locate outgoing interface; if we're the destination,
1193: * use the incoming interface (should be same).
1194: */
1.96 thorpej 1195: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1196: == NULL &&
1197: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1198: type = ICMP_UNREACH;
1199: code = ICMP_UNREACH_HOST;
1200: goto bad;
1201: }
1.20 mycroft 1202: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1203: (caddr_t)(cp + off), sizeof(struct in_addr));
1204: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1205: break;
1206:
1207: case IPOPT_TS:
1208: code = cp - (u_char *)ip;
1209: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1210: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1211: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1212: goto bad;
1.114 itojun 1213: }
1214: if (ipt->ipt_ptr < 5) {
1215: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1216: goto bad;
1217: }
1.15 cgd 1218: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1219: if (++ipt->ipt_oflw == 0) {
1220: code = (u_char *)&ipt->ipt_ptr -
1221: (u_char *)ip;
1.1 cgd 1222: goto bad;
1.114 itojun 1223: }
1.1 cgd 1224: break;
1225: }
1.104 thorpej 1226: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1227: switch (ipt->ipt_flg) {
1228:
1229: case IPOPT_TS_TSONLY:
1230: break;
1231:
1232: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1233: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1234: sizeof(struct in_addr) > ipt->ipt_len) {
1235: code = (u_char *)&ipt->ipt_ptr -
1236: (u_char *)ip;
1.1 cgd 1237: goto bad;
1.114 itojun 1238: }
1.13 mycroft 1239: ipaddr.sin_addr = dst;
1.96 thorpej 1240: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1241: m->m_pkthdr.rcvif));
1.13 mycroft 1242: if (ia == 0)
1243: continue;
1.104 thorpej 1244: bcopy(&ia->ia_addr.sin_addr,
1245: cp0, sizeof(struct in_addr));
1.1 cgd 1246: ipt->ipt_ptr += sizeof(struct in_addr);
1247: break;
1248:
1249: case IPOPT_TS_PRESPEC:
1.66 thorpej 1250: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1251: sizeof(struct in_addr) > ipt->ipt_len) {
1252: code = (u_char *)&ipt->ipt_ptr -
1253: (u_char *)ip;
1.1 cgd 1254: goto bad;
1.114 itojun 1255: }
1.104 thorpej 1256: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1257: sizeof(struct in_addr));
1.96 thorpej 1258: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1259: == NULL)
1.1 cgd 1260: continue;
1261: ipt->ipt_ptr += sizeof(struct in_addr);
1262: break;
1263:
1264: default:
1.114 itojun 1265: /* XXX can't take &ipt->ipt_flg */
1266: code = (u_char *)&ipt->ipt_ptr -
1267: (u_char *)ip + 1;
1.1 cgd 1268: goto bad;
1269: }
1270: ntime = iptime();
1.107 thorpej 1271: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1272: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1273: sizeof(n_time));
1274: ipt->ipt_ptr += sizeof(n_time);
1275: }
1276: }
1277: if (forward) {
1.26 thorpej 1278: if (ip_forwsrcrt == 0) {
1279: type = ICMP_UNREACH;
1280: code = ICMP_UNREACH_SRCFAIL;
1281: goto bad;
1282: }
1.1 cgd 1283: ip_forward(m, 1);
1284: return (1);
1.13 mycroft 1285: }
1286: return (0);
1.1 cgd 1287: bad:
1.13 mycroft 1288: icmp_error(m, type, code, 0, 0);
1289: ipstat.ips_badoptions++;
1.1 cgd 1290: return (1);
1291: }
1292:
1293: /*
1294: * Given address of next destination (final or next hop),
1295: * return internet address info of interface to be used to get there.
1296: */
1297: struct in_ifaddr *
1298: ip_rtaddr(dst)
1299: struct in_addr dst;
1300: {
1.109 augustss 1301: struct sockaddr_in *sin;
1.1 cgd 1302:
1.19 mycroft 1303: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1304:
1.35 mycroft 1305: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1306: if (ipforward_rt.ro_rt) {
1307: RTFREE(ipforward_rt.ro_rt);
1308: ipforward_rt.ro_rt = 0;
1309: }
1310: sin->sin_family = AF_INET;
1311: sin->sin_len = sizeof(*sin);
1312: sin->sin_addr = dst;
1313:
1314: rtalloc(&ipforward_rt);
1315: }
1316: if (ipforward_rt.ro_rt == 0)
1317: return ((struct in_ifaddr *)0);
1.19 mycroft 1318: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1319: }
1320:
1321: /*
1322: * Save incoming source route for use in replies,
1323: * to be picked up later by ip_srcroute if the receiver is interested.
1324: */
1.13 mycroft 1325: void
1.1 cgd 1326: save_rte(option, dst)
1327: u_char *option;
1328: struct in_addr dst;
1329: {
1330: unsigned olen;
1331:
1332: olen = option[IPOPT_OLEN];
1333: #ifdef DIAGNOSTIC
1334: if (ipprintfs)
1.39 christos 1335: printf("save_rte: olen %d\n", olen);
1.89 itojun 1336: #endif /* 0 */
1.1 cgd 1337: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1338: return;
1339: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1340: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1341: ip_srcrt.dst = dst;
1342: }
1343:
1344: /*
1345: * Retrieve incoming source route for use in replies,
1346: * in the same form used by setsockopt.
1347: * The first hop is placed before the options, will be removed later.
1348: */
1349: struct mbuf *
1350: ip_srcroute()
1351: {
1.109 augustss 1352: struct in_addr *p, *q;
1353: struct mbuf *m;
1.1 cgd 1354:
1355: if (ip_nhops == 0)
1356: return ((struct mbuf *)0);
1357: m = m_get(M_DONTWAIT, MT_SOOPTS);
1358: if (m == 0)
1359: return ((struct mbuf *)0);
1360:
1.13 mycroft 1361: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1362:
1363: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1364: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1365: OPTSIZ;
1366: #ifdef DIAGNOSTIC
1367: if (ipprintfs)
1.39 christos 1368: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1369: #endif
1370:
1371: /*
1372: * First save first hop for return route
1373: */
1374: p = &ip_srcrt.route[ip_nhops - 1];
1375: *(mtod(m, struct in_addr *)) = *p--;
1376: #ifdef DIAGNOSTIC
1377: if (ipprintfs)
1.39 christos 1378: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1379: #endif
1380:
1381: /*
1382: * Copy option fields and padding (nop) to mbuf.
1383: */
1384: ip_srcrt.nop = IPOPT_NOP;
1385: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1386: bcopy((caddr_t)&ip_srcrt.nop,
1387: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1388: q = (struct in_addr *)(mtod(m, caddr_t) +
1389: sizeof(struct in_addr) + OPTSIZ);
1390: #undef OPTSIZ
1391: /*
1392: * Record return path as an IP source route,
1393: * reversing the path (pointers are now aligned).
1394: */
1395: while (p >= ip_srcrt.route) {
1396: #ifdef DIAGNOSTIC
1397: if (ipprintfs)
1.39 christos 1398: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1399: #endif
1400: *q++ = *p--;
1401: }
1402: /*
1403: * Last hop goes to final destination.
1404: */
1405: *q = ip_srcrt.dst;
1406: #ifdef DIAGNOSTIC
1407: if (ipprintfs)
1.39 christos 1408: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1409: #endif
1410: return (m);
1411: }
1412:
1413: /*
1414: * Strip out IP options, at higher
1415: * level protocol in the kernel.
1416: * Second argument is buffer to which options
1417: * will be moved, and return value is their length.
1418: * XXX should be deleted; last arg currently ignored.
1419: */
1.8 mycroft 1420: void
1.1 cgd 1421: ip_stripoptions(m, mopt)
1.109 augustss 1422: struct mbuf *m;
1.1 cgd 1423: struct mbuf *mopt;
1424: {
1.109 augustss 1425: int i;
1.1 cgd 1426: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1427: caddr_t opts;
1.1 cgd 1428: int olen;
1429:
1.79 mycroft 1430: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1431: opts = (caddr_t)(ip + 1);
1432: i = m->m_len - (sizeof (struct ip) + olen);
1433: bcopy(opts + olen, opts, (unsigned)i);
1434: m->m_len -= olen;
1435: if (m->m_flags & M_PKTHDR)
1436: m->m_pkthdr.len -= olen;
1.79 mycroft 1437: ip->ip_len -= olen;
1438: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1439: }
1440:
1.130.2.5 nathanw 1441: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1442: 0, 0, 0, 0,
1443: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1444: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1445: EMSGSIZE, EHOSTUNREACH, 0, 0,
1446: 0, 0, 0, 0,
1447: ENOPROTOOPT
1448: };
1449:
1450: /*
1451: * Forward a packet. If some error occurs return the sender
1452: * an icmp packet. Note we can't always generate a meaningful
1453: * icmp message because icmp doesn't have a large enough repertoire
1454: * of codes and types.
1455: *
1456: * If not forwarding, just drop the packet. This could be confusing
1457: * if ipforwarding was zero but some routing protocol was advancing
1458: * us as a gateway to somewhere. However, we must let the routing
1459: * protocol deal with that.
1460: *
1461: * The srcrt parameter indicates whether the packet is being forwarded
1462: * via a source route.
1463: */
1.13 mycroft 1464: void
1.1 cgd 1465: ip_forward(m, srcrt)
1466: struct mbuf *m;
1467: int srcrt;
1468: {
1.109 augustss 1469: struct ip *ip = mtod(m, struct ip *);
1470: struct sockaddr_in *sin;
1471: struct rtentry *rt;
1.28 christos 1472: int error, type = 0, code = 0;
1.1 cgd 1473: struct mbuf *mcopy;
1.13 mycroft 1474: n_long dest;
1475: struct ifnet *destifp;
1.89 itojun 1476: #ifdef IPSEC
1477: struct ifnet dummyifp;
1478: #endif
1.1 cgd 1479:
1.130.2.2 nathanw 1480: /*
1481: * Clear any in-bound checksum flags for this packet.
1482: */
1483: m->m_pkthdr.csum_flags = 0;
1484:
1.13 mycroft 1485: dest = 0;
1.1 cgd 1486: #ifdef DIAGNOSTIC
1487: if (ipprintfs)
1.70 thorpej 1488: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1489: ntohl(ip->ip_src.s_addr),
1490: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1491: #endif
1.93 sommerfe 1492: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1493: ipstat.ips_cantforward++;
1494: m_freem(m);
1495: return;
1496: }
1497: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1498: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1499: return;
1500: }
1501: ip->ip_ttl -= IPTTLDEC;
1502:
1.19 mycroft 1503: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1504: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1505: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1506: if (ipforward_rt.ro_rt) {
1507: RTFREE(ipforward_rt.ro_rt);
1508: ipforward_rt.ro_rt = 0;
1509: }
1510: sin->sin_family = AF_INET;
1.35 mycroft 1511: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1512: sin->sin_addr = ip->ip_dst;
1513:
1514: rtalloc(&ipforward_rt);
1515: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1516: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1517: return;
1518: }
1519: rt = ipforward_rt.ro_rt;
1520: }
1521:
1522: /*
1.34 mycroft 1523: * Save at most 68 bytes of the packet in case
1.1 cgd 1524: * we need to generate an ICMP message to the src.
1.119 itojun 1525: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1526: */
1.119 itojun 1527: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1528: if (mcopy)
1529: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1530:
1531: /*
1532: * If forwarding packet using same interface that it came in on,
1533: * perhaps should send a redirect to sender to shortcut a hop.
1534: * Only send redirect if source is sending directly to us,
1535: * and if packet was not source routed (or has any options).
1536: * Also, don't send redirect if forwarding using a default route
1537: * or a route modified by a redirect.
1538: */
1539: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1540: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1541: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1542: ipsendredirects && !srcrt) {
1.19 mycroft 1543: if (rt->rt_ifa &&
1544: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1545: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1546: if (rt->rt_flags & RTF_GATEWAY)
1547: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1548: else
1549: dest = ip->ip_dst.s_addr;
1550: /*
1551: * Router requirements says to only send host
1552: * redirects.
1553: */
1554: type = ICMP_REDIRECT;
1555: code = ICMP_REDIRECT_HOST;
1.1 cgd 1556: #ifdef DIAGNOSTIC
1.77 thorpej 1557: if (ipprintfs)
1558: printf("redirect (%d) to %x\n", code,
1559: (u_int32_t)dest);
1.1 cgd 1560: #endif
1561: }
1562: }
1563:
1.89 itojun 1564: #ifdef IPSEC
1.130.2.2 nathanw 1565: /* Don't lookup socket in forwarding case */
1.127 itojun 1566: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1567: #endif
1.27 thorpej 1568: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1569: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1570: if (error)
1571: ipstat.ips_cantforward++;
1572: else {
1573: ipstat.ips_forward++;
1574: if (type)
1575: ipstat.ips_redirectsent++;
1576: else {
1.63 matt 1577: if (mcopy) {
1578: #ifdef GATEWAY
1.64 thorpej 1579: if (mcopy->m_flags & M_CANFASTFWD)
1580: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1581: #endif
1.1 cgd 1582: m_freem(mcopy);
1.63 matt 1583: }
1.1 cgd 1584: return;
1585: }
1586: }
1587: if (mcopy == NULL)
1588: return;
1.13 mycroft 1589: destifp = NULL;
1590:
1.1 cgd 1591: switch (error) {
1592:
1593: case 0: /* forwarded, but need redirect */
1594: /* type, code set above */
1595: break;
1596:
1597: case ENETUNREACH: /* shouldn't happen, checked above */
1598: case EHOSTUNREACH:
1599: case ENETDOWN:
1600: case EHOSTDOWN:
1601: default:
1602: type = ICMP_UNREACH;
1603: code = ICMP_UNREACH_HOST;
1604: break;
1605:
1606: case EMSGSIZE:
1607: type = ICMP_UNREACH;
1608: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1609: #ifndef IPSEC
1.13 mycroft 1610: if (ipforward_rt.ro_rt)
1611: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1612: #else
1613: /*
1614: * If the packet is routed over IPsec tunnel, tell the
1615: * originator the tunnel MTU.
1616: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1617: * XXX quickhack!!!
1618: */
1619: if (ipforward_rt.ro_rt) {
1620: struct secpolicy *sp;
1621: int ipsecerror;
1.95 itojun 1622: size_t ipsechdr;
1.89 itojun 1623: struct route *ro;
1624:
1625: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1626: IPSEC_DIR_OUTBOUND,
1627: IP_FORWARDING,
1628: &ipsecerror);
1.89 itojun 1629:
1630: if (sp == NULL)
1631: destifp = ipforward_rt.ro_rt->rt_ifp;
1632: else {
1633: /* count IPsec header size */
1.95 itojun 1634: ipsechdr = ipsec4_hdrsiz(mcopy,
1635: IPSEC_DIR_OUTBOUND,
1636: NULL);
1.89 itojun 1637:
1638: /*
1639: * find the correct route for outer IPv4
1640: * header, compute tunnel MTU.
1641: *
1642: * XXX BUG ALERT
1643: * The "dummyifp" code relies upon the fact
1644: * that icmp_error() touches only ifp->if_mtu.
1645: */
1646: /*XXX*/
1647: destifp = NULL;
1648: if (sp->req != NULL
1.95 itojun 1649: && sp->req->sav != NULL
1650: && sp->req->sav->sah != NULL) {
1651: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1652: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1653: dummyifp.if_mtu =
1654: ro->ro_rt->rt_ifp->if_mtu;
1655: dummyifp.if_mtu -= ipsechdr;
1656: destifp = &dummyifp;
1657: }
1658: }
1659:
1660: key_freesp(sp);
1661: }
1662: }
1663: #endif /*IPSEC*/
1.1 cgd 1664: ipstat.ips_cantfrag++;
1665: break;
1666:
1667: case ENOBUFS:
1668: type = ICMP_SOURCEQUENCH;
1669: code = 0;
1670: break;
1671: }
1.13 mycroft 1672: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1673: }
1674:
1675: void
1676: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1677: struct inpcb *inp;
1678: struct mbuf **mp;
1679: struct ip *ip;
1680: struct mbuf *m;
1.44 thorpej 1681: {
1682:
1683: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1684: struct timeval tv;
1685:
1686: microtime(&tv);
1687: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1688: SCM_TIMESTAMP, SOL_SOCKET);
1689: if (*mp)
1690: mp = &(*mp)->m_next;
1691: }
1692: if (inp->inp_flags & INP_RECVDSTADDR) {
1693: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1694: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1695: if (*mp)
1696: mp = &(*mp)->m_next;
1697: }
1698: #ifdef notyet
1699: /*
1700: * XXX
1701: * Moving these out of udp_input() made them even more broken
1702: * than they already were.
1703: * - fenner@parc.xerox.com
1704: */
1705: /* options were tossed already */
1706: if (inp->inp_flags & INP_RECVOPTS) {
1707: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1708: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1709: if (*mp)
1710: mp = &(*mp)->m_next;
1711: }
1712: /* ip_srcroute doesn't do what we want here, need to fix */
1713: if (inp->inp_flags & INP_RECVRETOPTS) {
1714: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1715: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1716: if (*mp)
1717: mp = &(*mp)->m_next;
1718: }
1719: #endif
1720: if (inp->inp_flags & INP_RECVIF) {
1721: struct sockaddr_dl sdl;
1722:
1723: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1724: sdl.sdl_family = AF_LINK;
1725: sdl.sdl_index = m->m_pkthdr.rcvif ?
1726: m->m_pkthdr.rcvif->if_index : 0;
1727: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1728: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1729: IP_RECVIF, IPPROTO_IP);
1730: if (*mp)
1731: mp = &(*mp)->m_next;
1732: }
1.13 mycroft 1733: }
1734:
1735: int
1736: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1737: int *name;
1738: u_int namelen;
1739: void *oldp;
1740: size_t *oldlenp;
1741: void *newp;
1742: size_t newlen;
1743: {
1.88 sommerfe 1744: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1745:
1.54 lukem 1746: int error, old;
1747:
1.13 mycroft 1748: /* All sysctl names at this level are terminal. */
1749: if (namelen != 1)
1750: return (ENOTDIR);
1751:
1752: switch (name[0]) {
1753: case IPCTL_FORWARDING:
1754: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1755: case IPCTL_SENDREDIRECTS:
1756: return (sysctl_int(oldp, oldlenp, newp, newlen,
1757: &ipsendredirects));
1758: case IPCTL_DEFTTL:
1759: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1760: #ifdef notyet
1761: case IPCTL_DEFMTU:
1762: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1763: #endif
1.26 thorpej 1764: case IPCTL_FORWSRCRT:
1.47 cjs 1765: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1766: if (securelevel > 0)
1.46 cjs 1767: return (sysctl_rdint(oldp, oldlenp, newp,
1768: ip_forwsrcrt));
1769: else
1770: return (sysctl_int(oldp, oldlenp, newp, newlen,
1771: &ip_forwsrcrt));
1.27 thorpej 1772: case IPCTL_DIRECTEDBCAST:
1773: return (sysctl_int(oldp, oldlenp, newp, newlen,
1774: &ip_directedbcast));
1.47 cjs 1775: case IPCTL_ALLOWSRCRT:
1776: return (sysctl_int(oldp, oldlenp, newp, newlen,
1777: &ip_allowsrcrt));
1.52 thorpej 1778: case IPCTL_SUBNETSARELOCAL:
1779: return (sysctl_int(oldp, oldlenp, newp, newlen,
1780: &subnetsarelocal));
1.53 kml 1781: case IPCTL_MTUDISC:
1.60 kml 1782: error = sysctl_int(oldp, oldlenp, newp, newlen,
1783: &ip_mtudisc);
1784: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1785: ip_mtudisc_timeout_q =
1786: rt_timer_queue_create(ip_mtudisc_timeout);
1787: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1788: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1789: ip_mtudisc_timeout_q = NULL;
1790: }
1791: return error;
1.54 lukem 1792: case IPCTL_ANONPORTMIN:
1793: old = anonportmin;
1794: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1795: if (anonportmin >= anonportmax || anonportmin < 0
1796: || anonportmin > 65535
1.54 lukem 1797: #ifndef IPNOPRIVPORTS
1798: || anonportmin < IPPORT_RESERVED
1799: #endif
1800: ) {
1801: anonportmin = old;
1802: return (EINVAL);
1803: }
1804: return (error);
1805: case IPCTL_ANONPORTMAX:
1806: old = anonportmax;
1807: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1808: if (anonportmin >= anonportmax || anonportmax < 0
1809: || anonportmax > 65535
1.54 lukem 1810: #ifndef IPNOPRIVPORTS
1811: || anonportmax < IPPORT_RESERVED
1812: #endif
1813: ) {
1814: anonportmax = old;
1815: return (EINVAL);
1816: }
1.60 kml 1817: return (error);
1818: case IPCTL_MTUDISCTIMEOUT:
1819: error = sysctl_int(oldp, oldlenp, newp, newlen,
1820: &ip_mtudisc_timeout);
1821: if (ip_mtudisc_timeout_q != NULL)
1822: rt_timer_queue_change(ip_mtudisc_timeout_q,
1823: ip_mtudisc_timeout);
1.54 lukem 1824: return (error);
1.65 matt 1825: #ifdef GATEWAY
1826: case IPCTL_MAXFLOWS:
1.67 thorpej 1827: {
1828: int s;
1829:
1.65 matt 1830: error = sysctl_int(oldp, oldlenp, newp, newlen,
1831: &ip_maxflows);
1.67 thorpej 1832: s = splsoftnet();
1.65 matt 1833: ipflow_reap(0);
1.67 thorpej 1834: splx(s);
1.65 matt 1835: return (error);
1.67 thorpej 1836: }
1.89 itojun 1837: #endif
1.90 itojun 1838: case IPCTL_HOSTZEROBROADCAST:
1839: return (sysctl_int(oldp, oldlenp, newp, newlen,
1840: &hostzeroisbroadcast));
1.89 itojun 1841: #if NGIF > 0
1842: case IPCTL_GIF_TTL:
1843: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1844: &ip_gif_ttl));
1.117 tron 1845: #endif
1846:
1847: #ifndef IPNOPRIVPORTS
1848: case IPCTL_LOWPORTMIN:
1849: old = lowportmin;
1850: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1851: if (lowportmin >= lowportmax
1852: || lowportmin > IPPORT_RESERVEDMAX
1853: || lowportmin < IPPORT_RESERVEDMIN
1854: ) {
1855: lowportmin = old;
1856: return (EINVAL);
1857: }
1858: return (error);
1859: case IPCTL_LOWPORTMAX:
1860: old = lowportmax;
1861: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1862: if (lowportmin >= lowportmax
1863: || lowportmax > IPPORT_RESERVEDMAX
1864: || lowportmax < IPPORT_RESERVEDMIN
1865: ) {
1866: lowportmax = old;
1867: return (EINVAL);
1868: }
1869: return (error);
1.65 matt 1870: #endif
1.130.2.1 nathanw 1871:
1872: case IPCTL_MAXFRAGPACKETS:
1873: return (sysctl_int(oldp, oldlenp, newp, newlen,
1874: &ip_maxfragpackets));
1.88 sommerfe 1875:
1.13 mycroft 1876: default:
1877: return (EOPNOTSUPP);
1878: }
1879: /* NOTREACHED */
1.1 cgd 1880: }
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