Annotation of src/sys/netinet/ip_input.c, Revision 1.130.2.1
1.130.2.1! nathanw 1: /* $NetBSD: ip_input.c,v 1.131 2001/03/27 02:24:38 itojun Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.55 scottr 103:
1.62 matt 104: #include "opt_gateway.h"
1.69 mrg 105: #include "opt_pfil_hooks.h"
1.91 thorpej 106: #include "opt_ipsec.h"
1.55 scottr 107: #include "opt_mrouting.h"
1.1 cgd 108:
1.5 mycroft 109: #include <sys/param.h>
110: #include <sys/systm.h>
111: #include <sys/malloc.h>
112: #include <sys/mbuf.h>
113: #include <sys/domain.h>
114: #include <sys/protosw.h>
115: #include <sys/socket.h>
1.44 thorpej 116: #include <sys/socketvar.h>
1.5 mycroft 117: #include <sys/errno.h>
118: #include <sys/time.h>
119: #include <sys/kernel.h>
1.28 christos 120: #include <sys/proc.h>
1.72 thorpej 121: #include <sys/pool.h>
1.28 christos 122:
1.115 mrg 123: #include <uvm/uvm_extern.h>
124:
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;
! 215: int ip_maxfragpackets = -1;
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:
225: s = splimp();
226: if (ipq_locked) {
227: splx(s);
228: return (0);
229: }
230: ipq_locked = 1;
231: splx(s);
232: return (1);
233: }
234:
235: static __inline void
236: ipq_unlock()
237: {
238: int s;
239:
240: s = splimp();
241: ipq_locked = 0;
242: splx(s);
243: }
244:
245: #ifdef DIAGNOSTIC
246: #define IPQ_LOCK() \
247: do { \
248: if (ipq_lock_try() == 0) { \
249: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
250: panic("ipq_lock"); \
251: } \
252: } while (0)
253: #define IPQ_LOCK_CHECK() \
254: do { \
255: if (ipq_locked == 0) { \
256: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
257: panic("ipq lock check"); \
258: } \
259: } while (0)
260: #else
261: #define IPQ_LOCK() (void) ipq_lock_try()
262: #define IPQ_LOCK_CHECK() /* nothing */
263: #endif
264:
265: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 266:
1.72 thorpej 267: struct pool ipqent_pool;
268:
1.1 cgd 269: /*
270: * We need to save the IP options in case a protocol wants to respond
271: * to an incoming packet over the same route if the packet got here
272: * using IP source routing. This allows connection establishment and
273: * maintenance when the remote end is on a network that is not known
274: * to us.
275: */
276: int ip_nhops = 0;
277: static struct ip_srcrt {
278: struct in_addr dst; /* final destination */
279: char nop; /* one NOP to align */
280: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
281: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
282: } ip_srcrt;
283:
1.13 mycroft 284: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 285:
1.1 cgd 286: /*
287: * IP initialization: fill in IP protocol switch table.
288: * All protocols not implemented in kernel go to raw IP protocol handler.
289: */
1.8 mycroft 290: void
1.1 cgd 291: ip_init()
292: {
1.109 augustss 293: struct protosw *pr;
294: int i;
1.1 cgd 295:
1.72 thorpej 296: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
297: 0, NULL, NULL, M_IPQ);
298:
1.1 cgd 299: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
300: if (pr == 0)
301: panic("ip_init");
302: for (i = 0; i < IPPROTO_MAX; i++)
303: ip_protox[i] = pr - inetsw;
304: for (pr = inetdomain.dom_protosw;
305: pr < inetdomain.dom_protoswNPROTOSW; pr++)
306: if (pr->pr_domain->dom_family == PF_INET &&
307: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
308: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 309: LIST_INIT(&ipq);
1.1 cgd 310: ip_id = time.tv_sec & 0xffff;
311: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 312: TAILQ_INIT(&in_ifaddr);
1.120 ad 313: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
314: M_WAITOK, &in_ifaddrhash);
1.60 kml 315: if (ip_mtudisc != 0)
316: ip_mtudisc_timeout_q =
317: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 318: #ifdef GATEWAY
319: ipflow_init();
320: #endif
1.121 thorpej 321:
322: #ifdef PFIL_HOOKS
323: /* Register our Packet Filter hook. */
1.126 thorpej 324: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
325: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 326: i = pfil_head_register(&inet_pfil_hook);
327: if (i != 0)
328: printf("ip_init: WARNING: unable to register pfil hook, "
329: "error %d\n", i);
330: #endif /* PFIL_HOOKS */
1.1 cgd 331: }
332:
333: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
334: struct route ipforward_rt;
335:
336: /*
1.89 itojun 337: * IP software interrupt routine
338: */
339: void
340: ipintr()
341: {
342: int s;
343: struct mbuf *m;
344:
345: while (1) {
346: s = splimp();
347: IF_DEQUEUE(&ipintrq, m);
348: splx(s);
349: if (m == 0)
350: return;
351: ip_input(m);
352: }
353: }
354:
355: /*
1.1 cgd 356: * Ip input routine. Checksum and byte swap header. If fragmented
357: * try to reassemble. Process options. Pass to next level.
358: */
1.8 mycroft 359: void
1.89 itojun 360: ip_input(struct mbuf *m)
1.1 cgd 361: {
1.109 augustss 362: struct ip *ip = NULL;
363: struct ipq *fp;
364: struct in_ifaddr *ia;
365: struct ifaddr *ifa;
1.25 cgd 366: struct ipqent *ipqe;
1.89 itojun 367: int hlen = 0, mff, len;
1.100 itojun 368: int downmatch;
1.1 cgd 369:
370: #ifdef DIAGNOSTIC
371: if ((m->m_flags & M_PKTHDR) == 0)
372: panic("ipintr no HDR");
373: #endif
1.89 itojun 374: #ifdef IPSEC
375: /*
376: * should the inner packet be considered authentic?
377: * see comment in ah4_input().
378: */
379: if (m) {
380: m->m_flags &= ~M_AUTHIPHDR;
381: m->m_flags &= ~M_AUTHIPDGM;
382: }
383: #endif
1.1 cgd 384: /*
385: * If no IP addresses have been set yet but the interfaces
386: * are receiving, can't do anything with incoming packets yet.
387: */
1.22 mycroft 388: if (in_ifaddr.tqh_first == 0)
1.1 cgd 389: goto bad;
390: ipstat.ips_total++;
391: if (m->m_len < sizeof (struct ip) &&
392: (m = m_pullup(m, sizeof (struct ip))) == 0) {
393: ipstat.ips_toosmall++;
1.89 itojun 394: return;
1.1 cgd 395: }
396: ip = mtod(m, struct ip *);
1.13 mycroft 397: if (ip->ip_v != IPVERSION) {
398: ipstat.ips_badvers++;
399: goto bad;
400: }
1.1 cgd 401: hlen = ip->ip_hl << 2;
402: if (hlen < sizeof(struct ip)) { /* minimum header length */
403: ipstat.ips_badhlen++;
404: goto bad;
405: }
406: if (hlen > m->m_len) {
407: if ((m = m_pullup(m, hlen)) == 0) {
408: ipstat.ips_badhlen++;
1.89 itojun 409: return;
1.1 cgd 410: }
411: ip = mtod(m, struct ip *);
412: }
1.98 thorpej 413:
1.85 hwr 414: /*
1.99 thorpej 415: * RFC1122: packets with a multicast source address are
1.98 thorpej 416: * not allowed.
1.85 hwr 417: */
418: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 419: ipstat.ips_badaddr++;
1.85 hwr 420: goto bad;
1.129 itojun 421: }
422:
423: /* 127/8 must not appear on wire - RFC1122 */
424: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
425: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 426: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
427: ipstat.ips_badaddr++;
1.129 itojun 428: goto bad;
1.130 itojun 429: }
1.85 hwr 430: }
431:
1.78 mycroft 432: if (in_cksum(m, hlen) != 0) {
1.1 cgd 433: ipstat.ips_badsum++;
434: goto bad;
435: }
436:
1.121 thorpej 437: /* Retrieve the packet length. */
438: len = ntohs(ip->ip_len);
1.81 proff 439:
440: /*
441: * Check for additional length bogosity
442: */
1.84 proff 443: if (len < hlen) {
1.81 proff 444: ipstat.ips_badlen++;
445: goto bad;
446: }
1.1 cgd 447:
448: /*
449: * Check that the amount of data in the buffers
450: * is as at least much as the IP header would have us expect.
451: * Trim mbufs if longer than we expect.
452: * Drop packet if shorter than we expect.
453: */
1.35 mycroft 454: if (m->m_pkthdr.len < len) {
1.1 cgd 455: ipstat.ips_tooshort++;
456: goto bad;
457: }
1.35 mycroft 458: if (m->m_pkthdr.len > len) {
1.1 cgd 459: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 460: m->m_len = len;
461: m->m_pkthdr.len = len;
1.1 cgd 462: } else
1.35 mycroft 463: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 464: }
465:
1.94 itojun 466: #ifdef IPSEC
467: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
468: m->m_flags &= ~M_CANFASTFWD;
469: #else
1.64 thorpej 470: /*
471: * Assume that we can create a fast-forward IP flow entry
472: * based on this packet.
473: */
474: m->m_flags |= M_CANFASTFWD;
1.94 itojun 475: #endif
1.64 thorpej 476:
1.36 mrg 477: #ifdef PFIL_HOOKS
1.33 mrg 478: /*
1.64 thorpej 479: * Run through list of hooks for input packets. If there are any
480: * filters which require that additional packets in the flow are
481: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
482: * Note that filters must _never_ set this flag, as another filter
483: * in the list may have previously cleared it.
1.33 mrg 484: */
1.127 itojun 485: /*
486: * let ipfilter look at packet on the wire,
487: * not the decapsulated packet.
488: */
489: #ifdef IPSEC
490: if (!ipsec_gethist(m, NULL))
491: #else
492: if (1)
493: #endif
494: {
495: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
496: PFIL_IN) != 0)
1.121 thorpej 497: return;
1.127 itojun 498: if (m == NULL)
499: return;
500: ip = mtod(m, struct ip *);
501: }
1.36 mrg 502: #endif /* PFIL_HOOKS */
1.123 thorpej 503:
504: #ifdef ALTQ
505: /* XXX Temporary until ALTQ is changed to use a pfil hook */
506: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
507: /* packet dropped by traffic conditioner */
508: return;
509: }
510: #endif
1.121 thorpej 511:
512: /*
513: * Convert fields to host representation.
514: */
515: NTOHS(ip->ip_len);
516: NTOHS(ip->ip_off);
1.33 mrg 517:
1.1 cgd 518: /*
519: * Process options and, if not destined for us,
520: * ship it on. ip_dooptions returns 1 when an
521: * error was detected (causing an icmp message
522: * to be sent and the original packet to be freed).
523: */
524: ip_nhops = 0; /* for source routed packets */
525: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 526: return;
1.1 cgd 527:
528: /*
529: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 530: *
531: * Traditional 4.4BSD did not consult IFF_UP at all.
532: * The behavior here is to treat addresses on !IFF_UP interface
533: * as not mine.
1.1 cgd 534: */
1.100 itojun 535: downmatch = 0;
1.97 itojun 536: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
537: ia != NULL;
538: ia = ia->ia_hash.le_next) {
539: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
540: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
541: break;
1.100 itojun 542: else
543: downmatch++;
1.97 itojun 544: }
545: }
1.86 thorpej 546: if (ia != NULL)
547: goto ours;
1.57 tls 548: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
549: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
550: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
551: if (ifa->ifa_addr->sa_family != AF_INET) continue;
552: ia = ifatoia(ifa);
1.35 mycroft 553: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
554: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 555: /*
556: * Look for all-0's host part (old broadcast addr),
557: * either for subnet or net.
558: */
559: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 560: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 561: goto ours;
1.57 tls 562: /*
563: * An interface with IP address zero accepts
564: * all packets that arrive on that interface.
565: */
566: if (in_nullhost(ia->ia_addr.sin_addr))
567: goto ours;
1.1 cgd 568: }
569: }
1.18 mycroft 570: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 571: struct in_multi *inm;
572: #ifdef MROUTING
573: extern struct socket *ip_mrouter;
1.10 brezak 574:
575: if (m->m_flags & M_EXT) {
576: if ((m = m_pullup(m, hlen)) == 0) {
577: ipstat.ips_toosmall++;
1.89 itojun 578: return;
1.10 brezak 579: }
580: ip = mtod(m, struct ip *);
581: }
1.4 hpeyerl 582:
583: if (ip_mrouter) {
584: /*
585: * If we are acting as a multicast router, all
586: * incoming multicast packets are passed to the
587: * kernel-level multicast forwarding function.
588: * The packet is returned (relatively) intact; if
589: * ip_mforward() returns a non-zero value, the packet
590: * must be discarded, else it may be accepted below.
591: *
592: * (The IP ident field is put in the same byte order
593: * as expected when ip_mforward() is called from
594: * ip_output().)
595: */
1.13 mycroft 596: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
597: ipstat.ips_cantforward++;
1.4 hpeyerl 598: m_freem(m);
1.89 itojun 599: return;
1.4 hpeyerl 600: }
601:
602: /*
603: * The process-level routing demon needs to receive
604: * all multicast IGMP packets, whether or not this
605: * host belongs to their destination groups.
606: */
607: if (ip->ip_p == IPPROTO_IGMP)
608: goto ours;
1.13 mycroft 609: ipstat.ips_forward++;
1.4 hpeyerl 610: }
611: #endif
612: /*
613: * See if we belong to the destination multicast group on the
614: * arrival interface.
615: */
616: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
617: if (inm == NULL) {
1.13 mycroft 618: ipstat.ips_cantforward++;
1.4 hpeyerl 619: m_freem(m);
1.89 itojun 620: return;
1.4 hpeyerl 621: }
622: goto ours;
623: }
1.19 mycroft 624: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 625: in_nullhost(ip->ip_dst))
1.1 cgd 626: goto ours;
627:
628: /*
629: * Not for us; forward if possible and desirable.
630: */
631: if (ipforwarding == 0) {
632: ipstat.ips_cantforward++;
633: m_freem(m);
1.100 itojun 634: } else {
635: /*
636: * If ip_dst matched any of my address on !IFF_UP interface,
637: * and there's no IFF_UP interface that matches ip_dst,
638: * send icmp unreach. Forwarding it will result in in-kernel
639: * forwarding loop till TTL goes to 0.
640: */
641: if (downmatch) {
642: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
643: ipstat.ips_cantforward++;
644: return;
645: }
1.1 cgd 646: ip_forward(m, 0);
1.100 itojun 647: }
1.89 itojun 648: return;
1.1 cgd 649:
650: ours:
651: /*
652: * If offset or IP_MF are set, must reassemble.
653: * Otherwise, nothing need be done.
654: * (We could look in the reassembly queue to see
655: * if the packet was previously fragmented,
656: * but it's not worth the time; just let them time out.)
657: */
1.37 perry 658: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 659: /*
660: * Look for queue of fragments
661: * of this datagram.
662: */
1.75 thorpej 663: IPQ_LOCK();
1.25 cgd 664: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 665: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 666: in_hosteq(ip->ip_src, fp->ipq_src) &&
667: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 668: ip->ip_p == fp->ipq_p)
669: goto found;
670: fp = 0;
671: found:
672:
673: /*
674: * Adjust ip_len to not reflect header,
1.25 cgd 675: * set ipqe_mff if more fragments are expected,
1.1 cgd 676: * convert offset of this to bytes.
677: */
678: ip->ip_len -= hlen;
1.25 cgd 679: mff = (ip->ip_off & IP_MF) != 0;
680: if (mff) {
1.16 cgd 681: /*
682: * Make sure that fragments have a data length
683: * that's a non-zero multiple of 8 bytes.
684: */
1.17 cgd 685: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 686: ipstat.ips_badfrags++;
1.75 thorpej 687: IPQ_UNLOCK();
1.16 cgd 688: goto bad;
689: }
690: }
1.1 cgd 691: ip->ip_off <<= 3;
692:
693: /*
694: * If datagram marked as having more fragments
695: * or if this is not the first fragment,
696: * attempt reassembly; if it succeeds, proceed.
697: */
1.25 cgd 698: if (mff || ip->ip_off) {
1.1 cgd 699: ipstat.ips_fragments++;
1.72 thorpej 700: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 701: if (ipqe == NULL) {
702: ipstat.ips_rcvmemdrop++;
1.75 thorpej 703: IPQ_UNLOCK();
1.25 cgd 704: goto bad;
705: }
706: ipqe->ipqe_mff = mff;
1.50 thorpej 707: ipqe->ipqe_m = m;
1.25 cgd 708: ipqe->ipqe_ip = ip;
1.50 thorpej 709: m = ip_reass(ipqe, fp);
1.75 thorpej 710: if (m == 0) {
711: IPQ_UNLOCK();
1.89 itojun 712: return;
1.75 thorpej 713: }
1.13 mycroft 714: ipstat.ips_reassembled++;
1.50 thorpej 715: ip = mtod(m, struct ip *);
1.74 thorpej 716: hlen = ip->ip_hl << 2;
1.79 mycroft 717: ip->ip_len += hlen;
1.1 cgd 718: } else
719: if (fp)
720: ip_freef(fp);
1.75 thorpej 721: IPQ_UNLOCK();
1.79 mycroft 722: }
1.128 itojun 723:
724: #ifdef IPSEC
725: /*
726: * enforce IPsec policy checking if we are seeing last header.
727: * note that we do not visit this with protocols with pcb layer
728: * code - like udp/tcp/raw ip.
729: */
730: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
731: ipsec4_in_reject(m, NULL)) {
732: ipsecstat.in_polvio++;
733: goto bad;
734: }
735: #endif
1.1 cgd 736:
737: /*
738: * Switch out to protocol's input routine.
739: */
1.82 aidan 740: #if IFA_STATS
1.122 itojun 741: if (ia && ip)
742: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 743: #endif
1.1 cgd 744: ipstat.ips_delivered++;
1.89 itojun 745: {
746: int off = hlen, nh = ip->ip_p;
747:
748: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
749: return;
750: }
1.1 cgd 751: bad:
752: m_freem(m);
753: }
754:
755: /*
756: * Take incoming datagram fragment and try to
757: * reassemble it into whole datagram. If a chain for
758: * reassembly of this datagram already exists, then it
759: * is given as fp; otherwise have to make a chain.
760: */
1.50 thorpej 761: struct mbuf *
1.25 cgd 762: ip_reass(ipqe, fp)
1.109 augustss 763: struct ipqent *ipqe;
764: struct ipq *fp;
1.1 cgd 765: {
1.109 augustss 766: struct mbuf *m = ipqe->ipqe_m;
767: struct ipqent *nq, *p, *q;
1.25 cgd 768: struct ip *ip;
1.1 cgd 769: struct mbuf *t;
1.25 cgd 770: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 771: int i, next;
772:
1.75 thorpej 773: IPQ_LOCK_CHECK();
774:
1.1 cgd 775: /*
776: * Presence of header sizes in mbufs
777: * would confuse code below.
778: */
779: m->m_data += hlen;
780: m->m_len -= hlen;
781:
782: /*
783: * If first fragment to arrive, create a reassembly queue.
784: */
785: if (fp == 0) {
1.130.2.1! nathanw 786: /*
! 787: * Enforce upper bound on number of fragmented packets
! 788: * for which we attempt reassembly;
! 789: * If maxfrag is 0, never accept fragments.
! 790: * If maxfrag is -1, accept all fragments without limitation.
! 791: */
! 792: if (ip_maxfragpackets < 0)
! 793: ;
! 794: else if (ip_nfragpackets >= ip_maxfragpackets)
! 795: goto dropfrag;
! 796: ip_nfragpackets++;
1.50 thorpej 797: MALLOC(fp, struct ipq *, sizeof (struct ipq),
798: M_FTABLE, M_NOWAIT);
799: if (fp == NULL)
1.1 cgd 800: goto dropfrag;
1.25 cgd 801: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 802: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 803: fp->ipq_p = ipqe->ipqe_ip->ip_p;
804: fp->ipq_id = ipqe->ipqe_ip->ip_id;
805: LIST_INIT(&fp->ipq_fragq);
806: fp->ipq_src = ipqe->ipqe_ip->ip_src;
807: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
808: p = NULL;
1.1 cgd 809: goto insert;
810: }
811:
812: /*
813: * Find a segment which begins after this one does.
814: */
1.25 cgd 815: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
816: p = q, q = q->ipqe_q.le_next)
817: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 818: break;
819:
820: /*
821: * If there is a preceding segment, it may provide some of
822: * our data already. If so, drop the data from the incoming
823: * segment. If it provides all of our data, drop us.
824: */
1.25 cgd 825: if (p != NULL) {
826: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
827: ipqe->ipqe_ip->ip_off;
1.1 cgd 828: if (i > 0) {
1.25 cgd 829: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 830: goto dropfrag;
1.50 thorpej 831: m_adj(ipqe->ipqe_m, i);
1.25 cgd 832: ipqe->ipqe_ip->ip_off += i;
833: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 834: }
835: }
836:
837: /*
838: * While we overlap succeeding segments trim them or,
839: * if they are completely covered, dequeue them.
840: */
1.25 cgd 841: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
842: q->ipqe_ip->ip_off; q = nq) {
843: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
844: q->ipqe_ip->ip_off;
845: if (i < q->ipqe_ip->ip_len) {
846: q->ipqe_ip->ip_len -= i;
847: q->ipqe_ip->ip_off += i;
1.50 thorpej 848: m_adj(q->ipqe_m, i);
1.1 cgd 849: break;
850: }
1.25 cgd 851: nq = q->ipqe_q.le_next;
1.50 thorpej 852: m_freem(q->ipqe_m);
1.25 cgd 853: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 854: pool_put(&ipqent_pool, q);
1.1 cgd 855: }
856:
857: insert:
858: /*
859: * Stick new segment in its place;
860: * check for complete reassembly.
861: */
1.25 cgd 862: if (p == NULL) {
863: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
864: } else {
865: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
866: }
1.1 cgd 867: next = 0;
1.25 cgd 868: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
869: p = q, q = q->ipqe_q.le_next) {
870: if (q->ipqe_ip->ip_off != next)
1.1 cgd 871: return (0);
1.25 cgd 872: next += q->ipqe_ip->ip_len;
1.1 cgd 873: }
1.25 cgd 874: if (p->ipqe_mff)
1.1 cgd 875: return (0);
876:
877: /*
1.41 thorpej 878: * Reassembly is complete. Check for a bogus message size and
879: * concatenate fragments.
1.1 cgd 880: */
1.25 cgd 881: q = fp->ipq_fragq.lh_first;
882: ip = q->ipqe_ip;
1.41 thorpej 883: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
884: ipstat.ips_toolong++;
885: ip_freef(fp);
886: return (0);
887: }
1.50 thorpej 888: m = q->ipqe_m;
1.1 cgd 889: t = m->m_next;
890: m->m_next = 0;
891: m_cat(m, t);
1.25 cgd 892: nq = q->ipqe_q.le_next;
1.72 thorpej 893: pool_put(&ipqent_pool, q);
1.25 cgd 894: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 895: t = q->ipqe_m;
1.25 cgd 896: nq = q->ipqe_q.le_next;
1.72 thorpej 897: pool_put(&ipqent_pool, q);
1.1 cgd 898: m_cat(m, t);
899: }
900:
901: /*
902: * Create header for new ip packet by
903: * modifying header of first packet;
904: * dequeue and discard fragment reassembly header.
905: * Make header visible.
906: */
907: ip->ip_len = next;
1.25 cgd 908: ip->ip_src = fp->ipq_src;
909: ip->ip_dst = fp->ipq_dst;
910: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 911: FREE(fp, M_FTABLE);
1.130.2.1! nathanw 912: ip_nfragpackets--;
1.1 cgd 913: m->m_len += (ip->ip_hl << 2);
914: m->m_data -= (ip->ip_hl << 2);
915: /* some debugging cruft by sklower, below, will go away soon */
916: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 917: int plen = 0;
1.50 thorpej 918: for (t = m; t; t = t->m_next)
919: plen += t->m_len;
920: m->m_pkthdr.len = plen;
1.1 cgd 921: }
1.50 thorpej 922: return (m);
1.1 cgd 923:
924: dropfrag:
925: ipstat.ips_fragdropped++;
926: m_freem(m);
1.72 thorpej 927: pool_put(&ipqent_pool, ipqe);
1.1 cgd 928: return (0);
929: }
930:
931: /*
932: * Free a fragment reassembly header and all
933: * associated datagrams.
934: */
1.8 mycroft 935: void
1.1 cgd 936: ip_freef(fp)
937: struct ipq *fp;
938: {
1.109 augustss 939: struct ipqent *q, *p;
1.1 cgd 940:
1.75 thorpej 941: IPQ_LOCK_CHECK();
942:
1.25 cgd 943: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
944: p = q->ipqe_q.le_next;
1.50 thorpej 945: m_freem(q->ipqe_m);
1.25 cgd 946: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 947: pool_put(&ipqent_pool, q);
1.1 cgd 948: }
1.25 cgd 949: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 950: FREE(fp, M_FTABLE);
1.130.2.1! nathanw 951: ip_nfragpackets--;
1.1 cgd 952: }
953:
954: /*
955: * IP timer processing;
956: * if a timer expires on a reassembly
957: * queue, discard it.
958: */
1.8 mycroft 959: void
1.1 cgd 960: ip_slowtimo()
961: {
1.109 augustss 962: struct ipq *fp, *nfp;
1.24 mycroft 963: int s = splsoftnet();
1.1 cgd 964:
1.75 thorpej 965: IPQ_LOCK();
1.25 cgd 966: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
967: nfp = fp->ipq_q.le_next;
968: if (--fp->ipq_ttl == 0) {
1.1 cgd 969: ipstat.ips_fragtimeout++;
1.25 cgd 970: ip_freef(fp);
1.1 cgd 971: }
972: }
1.130.2.1! nathanw 973: /*
! 974: * If we are over the maximum number of fragments
! 975: * (due to the limit being lowered), drain off
! 976: * enough to get down to the new limit.
! 977: */
! 978: if (ip_maxfragpackets < 0)
! 979: ;
! 980: else {
! 981: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
! 982: ip_freef(ipq.lh_first);
! 983: }
1.75 thorpej 984: IPQ_UNLOCK();
1.63 matt 985: #ifdef GATEWAY
986: ipflow_slowtimo();
987: #endif
1.1 cgd 988: splx(s);
989: }
990:
991: /*
992: * Drain off all datagram fragments.
993: */
1.8 mycroft 994: void
1.1 cgd 995: ip_drain()
996: {
997:
1.75 thorpej 998: /*
999: * We may be called from a device's interrupt context. If
1000: * the ipq is already busy, just bail out now.
1001: */
1002: if (ipq_lock_try() == 0)
1003: return;
1004:
1.25 cgd 1005: while (ipq.lh_first != NULL) {
1.1 cgd 1006: ipstat.ips_fragdropped++;
1.25 cgd 1007: ip_freef(ipq.lh_first);
1.1 cgd 1008: }
1.75 thorpej 1009:
1010: IPQ_UNLOCK();
1.1 cgd 1011: }
1012:
1013: /*
1014: * Do option processing on a datagram,
1015: * possibly discarding it if bad options are encountered,
1016: * or forwarding it if source-routed.
1017: * Returns 1 if packet has been forwarded/freed,
1018: * 0 if the packet should be processed further.
1019: */
1.8 mycroft 1020: int
1.1 cgd 1021: ip_dooptions(m)
1022: struct mbuf *m;
1023: {
1.109 augustss 1024: struct ip *ip = mtod(m, struct ip *);
1025: u_char *cp, *cp0;
1026: struct ip_timestamp *ipt;
1027: struct in_ifaddr *ia;
1.1 cgd 1028: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1029: struct in_addr dst;
1.1 cgd 1030: n_time ntime;
1031:
1.13 mycroft 1032: dst = ip->ip_dst;
1.1 cgd 1033: cp = (u_char *)(ip + 1);
1034: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1035: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1036: opt = cp[IPOPT_OPTVAL];
1037: if (opt == IPOPT_EOL)
1038: break;
1039: if (opt == IPOPT_NOP)
1040: optlen = 1;
1041: else {
1.113 itojun 1042: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1043: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1044: goto bad;
1045: }
1.1 cgd 1046: optlen = cp[IPOPT_OLEN];
1.114 itojun 1047: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1048: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1049: goto bad;
1050: }
1051: }
1052: switch (opt) {
1053:
1054: default:
1055: break;
1056:
1057: /*
1058: * Source routing with record.
1059: * Find interface with current destination address.
1060: * If none on this machine then drop if strictly routed,
1061: * or do nothing if loosely routed.
1062: * Record interface address and bring up next address
1063: * component. If strictly routed make sure next
1064: * address is on directly accessible net.
1065: */
1066: case IPOPT_LSRR:
1067: case IPOPT_SSRR:
1.47 cjs 1068: if (ip_allowsrcrt == 0) {
1069: type = ICMP_UNREACH;
1070: code = ICMP_UNREACH_NET_PROHIB;
1071: goto bad;
1072: }
1.114 itojun 1073: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1074: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1075: goto bad;
1076: }
1.1 cgd 1077: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1078: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1079: goto bad;
1080: }
1081: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1082: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1083: if (ia == 0) {
1084: if (opt == IPOPT_SSRR) {
1085: type = ICMP_UNREACH;
1086: code = ICMP_UNREACH_SRCFAIL;
1087: goto bad;
1088: }
1089: /*
1090: * Loose routing, and not at next destination
1091: * yet; nothing to do except forward.
1092: */
1093: break;
1094: }
1095: off--; /* 0 origin */
1.112 sommerfe 1096: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1097: /*
1098: * End of source route. Should be for us.
1099: */
1100: save_rte(cp, ip->ip_src);
1101: break;
1102: }
1103: /*
1104: * locate outgoing interface
1105: */
1106: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1107: sizeof(ipaddr.sin_addr));
1.96 thorpej 1108: if (opt == IPOPT_SSRR)
1109: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1110: else
1.1 cgd 1111: ia = ip_rtaddr(ipaddr.sin_addr);
1112: if (ia == 0) {
1113: type = ICMP_UNREACH;
1114: code = ICMP_UNREACH_SRCFAIL;
1115: goto bad;
1116: }
1117: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1118: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1119: (caddr_t)(cp + off), sizeof(struct in_addr));
1120: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1121: /*
1122: * Let ip_intr's mcast routing check handle mcast pkts
1123: */
1.18 mycroft 1124: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1125: break;
1126:
1127: case IPOPT_RR:
1.114 itojun 1128: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1129: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1130: goto bad;
1131: }
1.1 cgd 1132: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1133: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1134: goto bad;
1135: }
1136: /*
1137: * If no space remains, ignore.
1138: */
1139: off--; /* 0 origin */
1.112 sommerfe 1140: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1141: break;
1142: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1143: sizeof(ipaddr.sin_addr));
1144: /*
1145: * locate outgoing interface; if we're the destination,
1146: * use the incoming interface (should be same).
1147: */
1.96 thorpej 1148: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1149: == NULL &&
1150: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1151: type = ICMP_UNREACH;
1152: code = ICMP_UNREACH_HOST;
1153: goto bad;
1154: }
1.20 mycroft 1155: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1156: (caddr_t)(cp + off), sizeof(struct in_addr));
1157: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1158: break;
1159:
1160: case IPOPT_TS:
1161: code = cp - (u_char *)ip;
1162: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1163: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1164: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1165: goto bad;
1.114 itojun 1166: }
1167: if (ipt->ipt_ptr < 5) {
1168: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1169: goto bad;
1170: }
1.15 cgd 1171: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1172: if (++ipt->ipt_oflw == 0) {
1173: code = (u_char *)&ipt->ipt_ptr -
1174: (u_char *)ip;
1.1 cgd 1175: goto bad;
1.114 itojun 1176: }
1.1 cgd 1177: break;
1178: }
1.104 thorpej 1179: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1180: switch (ipt->ipt_flg) {
1181:
1182: case IPOPT_TS_TSONLY:
1183: break;
1184:
1185: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1186: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1187: sizeof(struct in_addr) > ipt->ipt_len) {
1188: code = (u_char *)&ipt->ipt_ptr -
1189: (u_char *)ip;
1.1 cgd 1190: goto bad;
1.114 itojun 1191: }
1.13 mycroft 1192: ipaddr.sin_addr = dst;
1.96 thorpej 1193: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1194: m->m_pkthdr.rcvif));
1.13 mycroft 1195: if (ia == 0)
1196: continue;
1.104 thorpej 1197: bcopy(&ia->ia_addr.sin_addr,
1198: cp0, sizeof(struct in_addr));
1.1 cgd 1199: ipt->ipt_ptr += sizeof(struct in_addr);
1200: break;
1201:
1202: case IPOPT_TS_PRESPEC:
1.66 thorpej 1203: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1204: sizeof(struct in_addr) > ipt->ipt_len) {
1205: code = (u_char *)&ipt->ipt_ptr -
1206: (u_char *)ip;
1.1 cgd 1207: goto bad;
1.114 itojun 1208: }
1.104 thorpej 1209: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1210: sizeof(struct in_addr));
1.96 thorpej 1211: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1212: == NULL)
1.1 cgd 1213: continue;
1214: ipt->ipt_ptr += sizeof(struct in_addr);
1215: break;
1216:
1217: default:
1.114 itojun 1218: /* XXX can't take &ipt->ipt_flg */
1219: code = (u_char *)&ipt->ipt_ptr -
1220: (u_char *)ip + 1;
1.1 cgd 1221: goto bad;
1222: }
1223: ntime = iptime();
1.107 thorpej 1224: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1225: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1226: sizeof(n_time));
1227: ipt->ipt_ptr += sizeof(n_time);
1228: }
1229: }
1230: if (forward) {
1.26 thorpej 1231: if (ip_forwsrcrt == 0) {
1232: type = ICMP_UNREACH;
1233: code = ICMP_UNREACH_SRCFAIL;
1234: goto bad;
1235: }
1.1 cgd 1236: ip_forward(m, 1);
1237: return (1);
1.13 mycroft 1238: }
1239: return (0);
1.1 cgd 1240: bad:
1.13 mycroft 1241: icmp_error(m, type, code, 0, 0);
1242: ipstat.ips_badoptions++;
1.1 cgd 1243: return (1);
1244: }
1245:
1246: /*
1247: * Given address of next destination (final or next hop),
1248: * return internet address info of interface to be used to get there.
1249: */
1250: struct in_ifaddr *
1251: ip_rtaddr(dst)
1252: struct in_addr dst;
1253: {
1.109 augustss 1254: struct sockaddr_in *sin;
1.1 cgd 1255:
1.19 mycroft 1256: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1257:
1.35 mycroft 1258: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1259: if (ipforward_rt.ro_rt) {
1260: RTFREE(ipforward_rt.ro_rt);
1261: ipforward_rt.ro_rt = 0;
1262: }
1263: sin->sin_family = AF_INET;
1264: sin->sin_len = sizeof(*sin);
1265: sin->sin_addr = dst;
1266:
1267: rtalloc(&ipforward_rt);
1268: }
1269: if (ipforward_rt.ro_rt == 0)
1270: return ((struct in_ifaddr *)0);
1.19 mycroft 1271: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1272: }
1273:
1274: /*
1275: * Save incoming source route for use in replies,
1276: * to be picked up later by ip_srcroute if the receiver is interested.
1277: */
1.13 mycroft 1278: void
1.1 cgd 1279: save_rte(option, dst)
1280: u_char *option;
1281: struct in_addr dst;
1282: {
1283: unsigned olen;
1284:
1285: olen = option[IPOPT_OLEN];
1286: #ifdef DIAGNOSTIC
1287: if (ipprintfs)
1.39 christos 1288: printf("save_rte: olen %d\n", olen);
1.89 itojun 1289: #endif /* 0 */
1.1 cgd 1290: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1291: return;
1292: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1293: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1294: ip_srcrt.dst = dst;
1295: }
1296:
1297: /*
1298: * Retrieve incoming source route for use in replies,
1299: * in the same form used by setsockopt.
1300: * The first hop is placed before the options, will be removed later.
1301: */
1302: struct mbuf *
1303: ip_srcroute()
1304: {
1.109 augustss 1305: struct in_addr *p, *q;
1306: struct mbuf *m;
1.1 cgd 1307:
1308: if (ip_nhops == 0)
1309: return ((struct mbuf *)0);
1310: m = m_get(M_DONTWAIT, MT_SOOPTS);
1311: if (m == 0)
1312: return ((struct mbuf *)0);
1313:
1.13 mycroft 1314: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1315:
1316: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1317: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1318: OPTSIZ;
1319: #ifdef DIAGNOSTIC
1320: if (ipprintfs)
1.39 christos 1321: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1322: #endif
1323:
1324: /*
1325: * First save first hop for return route
1326: */
1327: p = &ip_srcrt.route[ip_nhops - 1];
1328: *(mtod(m, struct in_addr *)) = *p--;
1329: #ifdef DIAGNOSTIC
1330: if (ipprintfs)
1.39 christos 1331: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1332: #endif
1333:
1334: /*
1335: * Copy option fields and padding (nop) to mbuf.
1336: */
1337: ip_srcrt.nop = IPOPT_NOP;
1338: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1339: bcopy((caddr_t)&ip_srcrt.nop,
1340: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1341: q = (struct in_addr *)(mtod(m, caddr_t) +
1342: sizeof(struct in_addr) + OPTSIZ);
1343: #undef OPTSIZ
1344: /*
1345: * Record return path as an IP source route,
1346: * reversing the path (pointers are now aligned).
1347: */
1348: while (p >= ip_srcrt.route) {
1349: #ifdef DIAGNOSTIC
1350: if (ipprintfs)
1.39 christos 1351: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1352: #endif
1353: *q++ = *p--;
1354: }
1355: /*
1356: * Last hop goes to final destination.
1357: */
1358: *q = ip_srcrt.dst;
1359: #ifdef DIAGNOSTIC
1360: if (ipprintfs)
1.39 christos 1361: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1362: #endif
1363: return (m);
1364: }
1365:
1366: /*
1367: * Strip out IP options, at higher
1368: * level protocol in the kernel.
1369: * Second argument is buffer to which options
1370: * will be moved, and return value is their length.
1371: * XXX should be deleted; last arg currently ignored.
1372: */
1.8 mycroft 1373: void
1.1 cgd 1374: ip_stripoptions(m, mopt)
1.109 augustss 1375: struct mbuf *m;
1.1 cgd 1376: struct mbuf *mopt;
1377: {
1.109 augustss 1378: int i;
1.1 cgd 1379: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1380: caddr_t opts;
1.1 cgd 1381: int olen;
1382:
1.79 mycroft 1383: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1384: opts = (caddr_t)(ip + 1);
1385: i = m->m_len - (sizeof (struct ip) + olen);
1386: bcopy(opts + olen, opts, (unsigned)i);
1387: m->m_len -= olen;
1388: if (m->m_flags & M_PKTHDR)
1389: m->m_pkthdr.len -= olen;
1.79 mycroft 1390: ip->ip_len -= olen;
1391: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1392: }
1393:
1.23 mycroft 1394: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1395: 0, 0, 0, 0,
1396: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1397: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1398: EMSGSIZE, EHOSTUNREACH, 0, 0,
1399: 0, 0, 0, 0,
1400: ENOPROTOOPT
1401: };
1402:
1403: /*
1404: * Forward a packet. If some error occurs return the sender
1405: * an icmp packet. Note we can't always generate a meaningful
1406: * icmp message because icmp doesn't have a large enough repertoire
1407: * of codes and types.
1408: *
1409: * If not forwarding, just drop the packet. This could be confusing
1410: * if ipforwarding was zero but some routing protocol was advancing
1411: * us as a gateway to somewhere. However, we must let the routing
1412: * protocol deal with that.
1413: *
1414: * The srcrt parameter indicates whether the packet is being forwarded
1415: * via a source route.
1416: */
1.13 mycroft 1417: void
1.1 cgd 1418: ip_forward(m, srcrt)
1419: struct mbuf *m;
1420: int srcrt;
1421: {
1.109 augustss 1422: struct ip *ip = mtod(m, struct ip *);
1423: struct sockaddr_in *sin;
1424: struct rtentry *rt;
1.28 christos 1425: int error, type = 0, code = 0;
1.1 cgd 1426: struct mbuf *mcopy;
1.13 mycroft 1427: n_long dest;
1428: struct ifnet *destifp;
1.89 itojun 1429: #ifdef IPSEC
1430: struct ifnet dummyifp;
1431: #endif
1.1 cgd 1432:
1.13 mycroft 1433: dest = 0;
1.1 cgd 1434: #ifdef DIAGNOSTIC
1435: if (ipprintfs)
1.70 thorpej 1436: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1437: ntohl(ip->ip_src.s_addr),
1438: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1439: #endif
1.93 sommerfe 1440: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1441: ipstat.ips_cantforward++;
1442: m_freem(m);
1443: return;
1444: }
1445: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1446: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1447: return;
1448: }
1449: ip->ip_ttl -= IPTTLDEC;
1450:
1.19 mycroft 1451: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1452: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1453: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1454: if (ipforward_rt.ro_rt) {
1455: RTFREE(ipforward_rt.ro_rt);
1456: ipforward_rt.ro_rt = 0;
1457: }
1458: sin->sin_family = AF_INET;
1.35 mycroft 1459: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1460: sin->sin_addr = ip->ip_dst;
1461:
1462: rtalloc(&ipforward_rt);
1463: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1464: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1465: return;
1466: }
1467: rt = ipforward_rt.ro_rt;
1468: }
1469:
1470: /*
1.34 mycroft 1471: * Save at most 68 bytes of the packet in case
1.1 cgd 1472: * we need to generate an ICMP message to the src.
1.119 itojun 1473: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1474: */
1.119 itojun 1475: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1476: if (mcopy)
1477: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1478:
1479: /*
1480: * If forwarding packet using same interface that it came in on,
1481: * perhaps should send a redirect to sender to shortcut a hop.
1482: * Only send redirect if source is sending directly to us,
1483: * and if packet was not source routed (or has any options).
1484: * Also, don't send redirect if forwarding using a default route
1485: * or a route modified by a redirect.
1486: */
1487: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1488: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1489: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1490: ipsendredirects && !srcrt) {
1.19 mycroft 1491: if (rt->rt_ifa &&
1492: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1493: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1494: if (rt->rt_flags & RTF_GATEWAY)
1495: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1496: else
1497: dest = ip->ip_dst.s_addr;
1498: /*
1499: * Router requirements says to only send host
1500: * redirects.
1501: */
1502: type = ICMP_REDIRECT;
1503: code = ICMP_REDIRECT_HOST;
1.1 cgd 1504: #ifdef DIAGNOSTIC
1.77 thorpej 1505: if (ipprintfs)
1506: printf("redirect (%d) to %x\n", code,
1507: (u_int32_t)dest);
1.1 cgd 1508: #endif
1509: }
1510: }
1511:
1.89 itojun 1512: #ifdef IPSEC
1.103 itojun 1513: /* Don't lookup socket in forwading case */
1.127 itojun 1514: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1515: #endif
1.27 thorpej 1516: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1517: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1518: if (error)
1519: ipstat.ips_cantforward++;
1520: else {
1521: ipstat.ips_forward++;
1522: if (type)
1523: ipstat.ips_redirectsent++;
1524: else {
1.63 matt 1525: if (mcopy) {
1526: #ifdef GATEWAY
1.64 thorpej 1527: if (mcopy->m_flags & M_CANFASTFWD)
1528: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1529: #endif
1.1 cgd 1530: m_freem(mcopy);
1.63 matt 1531: }
1.1 cgd 1532: return;
1533: }
1534: }
1535: if (mcopy == NULL)
1536: return;
1.13 mycroft 1537: destifp = NULL;
1538:
1.1 cgd 1539: switch (error) {
1540:
1541: case 0: /* forwarded, but need redirect */
1542: /* type, code set above */
1543: break;
1544:
1545: case ENETUNREACH: /* shouldn't happen, checked above */
1546: case EHOSTUNREACH:
1547: case ENETDOWN:
1548: case EHOSTDOWN:
1549: default:
1550: type = ICMP_UNREACH;
1551: code = ICMP_UNREACH_HOST;
1552: break;
1553:
1554: case EMSGSIZE:
1555: type = ICMP_UNREACH;
1556: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1557: #ifndef IPSEC
1.13 mycroft 1558: if (ipforward_rt.ro_rt)
1559: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1560: #else
1561: /*
1562: * If the packet is routed over IPsec tunnel, tell the
1563: * originator the tunnel MTU.
1564: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1565: * XXX quickhack!!!
1566: */
1567: if (ipforward_rt.ro_rt) {
1568: struct secpolicy *sp;
1569: int ipsecerror;
1.95 itojun 1570: size_t ipsechdr;
1.89 itojun 1571: struct route *ro;
1572:
1573: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1574: IPSEC_DIR_OUTBOUND,
1575: IP_FORWARDING,
1576: &ipsecerror);
1.89 itojun 1577:
1578: if (sp == NULL)
1579: destifp = ipforward_rt.ro_rt->rt_ifp;
1580: else {
1581: /* count IPsec header size */
1.95 itojun 1582: ipsechdr = ipsec4_hdrsiz(mcopy,
1583: IPSEC_DIR_OUTBOUND,
1584: NULL);
1.89 itojun 1585:
1586: /*
1587: * find the correct route for outer IPv4
1588: * header, compute tunnel MTU.
1589: *
1590: * XXX BUG ALERT
1591: * The "dummyifp" code relies upon the fact
1592: * that icmp_error() touches only ifp->if_mtu.
1593: */
1594: /*XXX*/
1595: destifp = NULL;
1596: if (sp->req != NULL
1.95 itojun 1597: && sp->req->sav != NULL
1598: && sp->req->sav->sah != NULL) {
1599: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1600: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1601: dummyifp.if_mtu =
1602: ro->ro_rt->rt_ifp->if_mtu;
1603: dummyifp.if_mtu -= ipsechdr;
1604: destifp = &dummyifp;
1605: }
1606: }
1607:
1608: key_freesp(sp);
1609: }
1610: }
1611: #endif /*IPSEC*/
1.1 cgd 1612: ipstat.ips_cantfrag++;
1613: break;
1614:
1615: case ENOBUFS:
1616: type = ICMP_SOURCEQUENCH;
1617: code = 0;
1618: break;
1619: }
1.13 mycroft 1620: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1621: }
1622:
1623: void
1624: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1625: struct inpcb *inp;
1626: struct mbuf **mp;
1627: struct ip *ip;
1628: struct mbuf *m;
1.44 thorpej 1629: {
1630:
1631: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1632: struct timeval tv;
1633:
1634: microtime(&tv);
1635: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1636: SCM_TIMESTAMP, SOL_SOCKET);
1637: if (*mp)
1638: mp = &(*mp)->m_next;
1639: }
1640: if (inp->inp_flags & INP_RECVDSTADDR) {
1641: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1642: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1643: if (*mp)
1644: mp = &(*mp)->m_next;
1645: }
1646: #ifdef notyet
1647: /*
1648: * XXX
1649: * Moving these out of udp_input() made them even more broken
1650: * than they already were.
1651: * - fenner@parc.xerox.com
1652: */
1653: /* options were tossed already */
1654: if (inp->inp_flags & INP_RECVOPTS) {
1655: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1656: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1657: if (*mp)
1658: mp = &(*mp)->m_next;
1659: }
1660: /* ip_srcroute doesn't do what we want here, need to fix */
1661: if (inp->inp_flags & INP_RECVRETOPTS) {
1662: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1663: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1664: if (*mp)
1665: mp = &(*mp)->m_next;
1666: }
1667: #endif
1668: if (inp->inp_flags & INP_RECVIF) {
1669: struct sockaddr_dl sdl;
1670:
1671: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1672: sdl.sdl_family = AF_LINK;
1673: sdl.sdl_index = m->m_pkthdr.rcvif ?
1674: m->m_pkthdr.rcvif->if_index : 0;
1675: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1676: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1677: IP_RECVIF, IPPROTO_IP);
1678: if (*mp)
1679: mp = &(*mp)->m_next;
1680: }
1.13 mycroft 1681: }
1682:
1683: int
1684: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1685: int *name;
1686: u_int namelen;
1687: void *oldp;
1688: size_t *oldlenp;
1689: void *newp;
1690: size_t newlen;
1691: {
1.88 sommerfe 1692: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1693:
1.54 lukem 1694: int error, old;
1695:
1.13 mycroft 1696: /* All sysctl names at this level are terminal. */
1697: if (namelen != 1)
1698: return (ENOTDIR);
1699:
1700: switch (name[0]) {
1701: case IPCTL_FORWARDING:
1702: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1703: case IPCTL_SENDREDIRECTS:
1704: return (sysctl_int(oldp, oldlenp, newp, newlen,
1705: &ipsendredirects));
1706: case IPCTL_DEFTTL:
1707: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1708: #ifdef notyet
1709: case IPCTL_DEFMTU:
1710: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1711: #endif
1.26 thorpej 1712: case IPCTL_FORWSRCRT:
1.47 cjs 1713: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1714: if (securelevel > 0)
1.46 cjs 1715: return (sysctl_rdint(oldp, oldlenp, newp,
1716: ip_forwsrcrt));
1717: else
1718: return (sysctl_int(oldp, oldlenp, newp, newlen,
1719: &ip_forwsrcrt));
1.27 thorpej 1720: case IPCTL_DIRECTEDBCAST:
1721: return (sysctl_int(oldp, oldlenp, newp, newlen,
1722: &ip_directedbcast));
1.47 cjs 1723: case IPCTL_ALLOWSRCRT:
1724: return (sysctl_int(oldp, oldlenp, newp, newlen,
1725: &ip_allowsrcrt));
1.52 thorpej 1726: case IPCTL_SUBNETSARELOCAL:
1727: return (sysctl_int(oldp, oldlenp, newp, newlen,
1728: &subnetsarelocal));
1.53 kml 1729: case IPCTL_MTUDISC:
1.60 kml 1730: error = sysctl_int(oldp, oldlenp, newp, newlen,
1731: &ip_mtudisc);
1732: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1733: ip_mtudisc_timeout_q =
1734: rt_timer_queue_create(ip_mtudisc_timeout);
1735: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1736: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1737: ip_mtudisc_timeout_q = NULL;
1738: }
1739: return error;
1.54 lukem 1740: case IPCTL_ANONPORTMIN:
1741: old = anonportmin;
1742: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1743: if (anonportmin >= anonportmax || anonportmin < 0
1744: || anonportmin > 65535
1.54 lukem 1745: #ifndef IPNOPRIVPORTS
1746: || anonportmin < IPPORT_RESERVED
1747: #endif
1748: ) {
1749: anonportmin = old;
1750: return (EINVAL);
1751: }
1752: return (error);
1753: case IPCTL_ANONPORTMAX:
1754: old = anonportmax;
1755: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1756: if (anonportmin >= anonportmax || anonportmax < 0
1757: || anonportmax > 65535
1.54 lukem 1758: #ifndef IPNOPRIVPORTS
1759: || anonportmax < IPPORT_RESERVED
1760: #endif
1761: ) {
1762: anonportmax = old;
1763: return (EINVAL);
1764: }
1.60 kml 1765: return (error);
1766: case IPCTL_MTUDISCTIMEOUT:
1767: error = sysctl_int(oldp, oldlenp, newp, newlen,
1768: &ip_mtudisc_timeout);
1769: if (ip_mtudisc_timeout_q != NULL)
1770: rt_timer_queue_change(ip_mtudisc_timeout_q,
1771: ip_mtudisc_timeout);
1.54 lukem 1772: return (error);
1.65 matt 1773: #ifdef GATEWAY
1774: case IPCTL_MAXFLOWS:
1.67 thorpej 1775: {
1776: int s;
1777:
1.65 matt 1778: error = sysctl_int(oldp, oldlenp, newp, newlen,
1779: &ip_maxflows);
1.67 thorpej 1780: s = splsoftnet();
1.65 matt 1781: ipflow_reap(0);
1.67 thorpej 1782: splx(s);
1.65 matt 1783: return (error);
1.67 thorpej 1784: }
1.89 itojun 1785: #endif
1.90 itojun 1786: case IPCTL_HOSTZEROBROADCAST:
1787: return (sysctl_int(oldp, oldlenp, newp, newlen,
1788: &hostzeroisbroadcast));
1.89 itojun 1789: #if NGIF > 0
1790: case IPCTL_GIF_TTL:
1791: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1792: &ip_gif_ttl));
1.117 tron 1793: #endif
1794:
1795: #ifndef IPNOPRIVPORTS
1796: case IPCTL_LOWPORTMIN:
1797: old = lowportmin;
1798: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1799: if (lowportmin >= lowportmax
1800: || lowportmin > IPPORT_RESERVEDMAX
1801: || lowportmin < IPPORT_RESERVEDMIN
1802: ) {
1803: lowportmin = old;
1804: return (EINVAL);
1805: }
1806: return (error);
1807: case IPCTL_LOWPORTMAX:
1808: old = lowportmax;
1809: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1810: if (lowportmin >= lowportmax
1811: || lowportmax > IPPORT_RESERVEDMAX
1812: || lowportmax < IPPORT_RESERVEDMIN
1813: ) {
1814: lowportmax = old;
1815: return (EINVAL);
1816: }
1817: return (error);
1.65 matt 1818: #endif
1.130.2.1! nathanw 1819:
! 1820: case IPCTL_MAXFRAGPACKETS:
! 1821: return (sysctl_int(oldp, oldlenp, newp, newlen,
! 1822: &ip_maxfragpackets));
1.88 sommerfe 1823:
1.13 mycroft 1824: default:
1825: return (EOPNOTSUPP);
1826: }
1827: /* NOTREACHED */
1.1 cgd 1828: }
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