Annotation of src/sys/netinet/ip_input.c, Revision 1.292
1.292 ! matt 1: /* $NetBSD: ip_input.c,v 1.291 2010/11/05 01:35:57 rmind Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.152 itojun 6: *
1.89 itojun 7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
1.152 itojun 18: *
1.89 itojun 19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59: * POSSIBILITY OF SUCH DAMAGE.
60: */
1.14 cgd 61:
1.1 cgd 62: /*
1.13 mycroft 63: * Copyright (c) 1982, 1986, 1988, 1993
64: * The Regents of the University of California. All rights reserved.
1.1 cgd 65: *
66: * Redistribution and use in source and binary forms, with or without
67: * modification, are permitted provided that the following conditions
68: * are met:
69: * 1. Redistributions of source code must retain the above copyright
70: * notice, this list of conditions and the following disclaimer.
71: * 2. Redistributions in binary form must reproduce the above copyright
72: * notice, this list of conditions and the following disclaimer in the
73: * documentation and/or other materials provided with the distribution.
1.172 agc 74: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 75: * may be used to endorse or promote products derived from this software
76: * without specific prior written permission.
77: *
78: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
79: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
80: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
81: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
82: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
83: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
84: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
85: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
86: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
87: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
88: * SUCH DAMAGE.
89: *
1.14 cgd 90: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 91: */
1.141 lukem 92:
93: #include <sys/cdefs.h>
1.292 ! matt 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.291 2010/11/05 01:35:57 rmind Exp $");
1.55 scottr 95:
1.184 jonathan 96: #include "opt_inet.h"
1.278 christos 97: #include "opt_compat_netbsd.h"
1.62 matt 98: #include "opt_gateway.h"
1.69 mrg 99: #include "opt_pfil_hooks.h"
1.91 thorpej 100: #include "opt_ipsec.h"
1.55 scottr 101: #include "opt_mrouting.h"
1.167 martin 102: #include "opt_mbuftrace.h"
1.135 thorpej 103: #include "opt_inet_csum.h"
1.1 cgd 104:
1.5 mycroft 105: #include <sys/param.h>
106: #include <sys/systm.h>
107: #include <sys/mbuf.h>
108: #include <sys/domain.h>
109: #include <sys/protosw.h>
110: #include <sys/socket.h>
1.44 thorpej 111: #include <sys/socketvar.h>
1.5 mycroft 112: #include <sys/errno.h>
113: #include <sys/time.h>
114: #include <sys/kernel.h>
1.72 thorpej 115: #include <sys/pool.h>
1.28 christos 116: #include <sys/sysctl.h>
1.230 elad 117: #include <sys/kauth.h>
1.1 cgd 118:
1.5 mycroft 119: #include <net/if.h>
1.44 thorpej 120: #include <net/if_dl.h>
1.5 mycroft 121: #include <net/route.h>
1.45 mrg 122: #include <net/pfil.h>
1.1 cgd 123:
1.5 mycroft 124: #include <netinet/in.h>
125: #include <netinet/in_systm.h>
126: #include <netinet/ip.h>
127: #include <netinet/in_pcb.h>
1.215 yamt 128: #include <netinet/in_proto.h>
1.5 mycroft 129: #include <netinet/in_var.h>
130: #include <netinet/ip_var.h>
1.266 thorpej 131: #include <netinet/ip_private.h>
1.5 mycroft 132: #include <netinet/ip_icmp.h>
1.89 itojun 133: /* just for gif_ttl */
134: #include <netinet/in_gif.h>
135: #include "gif.h"
1.144 martin 136: #include <net/if_gre.h>
137: #include "gre.h"
1.111 jdolecek 138:
139: #ifdef MROUTING
140: #include <netinet/ip_mroute.h>
141: #endif
1.89 itojun 142:
143: #ifdef IPSEC
144: #include <netinet6/ipsec.h>
1.267 thorpej 145: #include <netinet6/ipsec_private.h>
1.89 itojun 146: #include <netkey/key.h>
147: #endif
1.173 jonathan 148: #ifdef FAST_IPSEC
149: #include <netipsec/ipsec.h>
150: #include <netipsec/key.h>
151: #endif /* FAST_IPSEC*/
1.44 thorpej 152:
1.1 cgd 153: #ifndef IPFORWARDING
154: #ifdef GATEWAY
155: #define IPFORWARDING 1 /* forward IP packets not for us */
156: #else /* GATEWAY */
157: #define IPFORWARDING 0 /* don't forward IP packets not for us */
158: #endif /* GATEWAY */
159: #endif /* IPFORWARDING */
160: #ifndef IPSENDREDIRECTS
161: #define IPSENDREDIRECTS 1
162: #endif
1.26 thorpej 163: #ifndef IPFORWSRCRT
1.47 cjs 164: #define IPFORWSRCRT 1 /* forward source-routed packets */
165: #endif
166: #ifndef IPALLOWSRCRT
1.48 mrg 167: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 168: #endif
1.53 kml 169: #ifndef IPMTUDISC
1.153 itojun 170: #define IPMTUDISC 1
1.53 kml 171: #endif
1.60 kml 172: #ifndef IPMTUDISCTIMEOUT
1.61 kml 173: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 174: #endif
1.53 kml 175:
1.278 christos 176: #ifdef COMPAT_50
177: #include <compat/sys/time.h>
178: #include <compat/sys/socket.h>
179: #endif
180:
1.27 thorpej 181: /*
182: * Note: DIRECTED_BROADCAST is handled this way so that previous
183: * configuration using this option will Just Work.
184: */
185: #ifndef IPDIRECTEDBCAST
186: #ifdef DIRECTED_BROADCAST
187: #define IPDIRECTEDBCAST 1
188: #else
189: #define IPDIRECTEDBCAST 0
190: #endif /* DIRECTED_BROADCAST */
191: #endif /* IPDIRECTEDBCAST */
1.1 cgd 192: int ipforwarding = IPFORWARDING;
193: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 194: int ip_defttl = IPDEFTTL;
1.26 thorpej 195: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 196: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 197: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 198: int ip_mtudisc = IPMTUDISC;
1.156 itojun 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 200: #ifdef DIAGNOSTIC
201: int ipprintfs = 0;
202: #endif
1.184 jonathan 203:
204: int ip_do_randomid = 0;
205:
1.165 christos 206: /*
207: * XXX - Setting ip_checkinterface mostly implements the receive side of
208: * the Strong ES model described in RFC 1122, but since the routing table
209: * and transmit implementation do not implement the Strong ES model,
210: * setting this to 1 results in an odd hybrid.
211: *
212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
213: * to translate the destination address to another local interface.
214: *
215: * XXX - ip_checkinterface must be disabled if you add IP aliases
216: * to the loopback interface instead of the interface where the
217: * packets for those addresses are received.
218: */
219: int ip_checkinterface = 0;
220:
1.1 cgd 221:
1.60 kml 222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
223:
1.1 cgd 224: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 225: u_long in_ifaddrhash; /* size of hash table - 1 */
226: int in_ifaddrentries; /* total number of addrs */
1.212 perry 227: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 228: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 229: u_long in_multihash; /* size of hash table - 1 */
230: int in_multientries; /* total number of addrs */
231: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 232: struct ifqueue ipintrq;
1.286 tls 233:
1.291 rmind 234: ipid_state_t * ip_ids;
1.183 jonathan 235: uint16_t ip_id;
1.75 thorpej 236:
1.266 thorpej 237: percpu_t *ipstat_percpu;
238:
1.121 thorpej 239: #ifdef PFIL_HOOKS
240: struct pfil_head inet_pfil_hook;
241: #endif
242:
1.275 pooka 243: struct pool inmulti_pool;
1.72 thorpej 244:
1.135 thorpej 245: #ifdef INET_CSUM_COUNTERS
246: #include <sys/device.h>
247:
248: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
249: NULL, "inet", "hwcsum bad");
250: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
251: NULL, "inet", "hwcsum ok");
252: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
253: NULL, "inet", "swcsum");
254:
255: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
256:
1.201 matt 257: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
258: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
259: EVCNT_ATTACH_STATIC(ip_swcsum);
260:
1.135 thorpej 261: #else
262:
263: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
264:
265: #endif /* INET_CSUM_COUNTERS */
266:
1.1 cgd 267: /*
268: * We need to save the IP options in case a protocol wants to respond
269: * to an incoming packet over the same route if the packet got here
270: * using IP source routing. This allows connection establishment and
271: * maintenance when the remote end is on a network that is not known
272: * to us.
273: */
274: int ip_nhops = 0;
275: static struct ip_srcrt {
276: struct in_addr dst; /* final destination */
277: char nop; /* one NOP to align */
278: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
279: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
280: } ip_srcrt;
281:
1.210 perry 282: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 283:
1.164 matt 284: #ifdef MBUFTRACE
1.234 dogcow 285: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
286: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 287: #endif
288:
1.284 pooka 289: static void sysctl_net_inet_ip_setup(struct sysctllog **);
290:
1.1 cgd 291: /*
292: * IP initialization: fill in IP protocol switch table.
293: * All protocols not implemented in kernel go to raw IP protocol handler.
294: */
1.8 mycroft 295: void
1.211 perry 296: ip_init(void)
1.1 cgd 297: {
1.199 matt 298: const struct protosw *pr;
1.109 augustss 299: int i;
1.1 cgd 300:
1.284 pooka 301: sysctl_net_inet_ip_setup(NULL);
302:
1.275 pooka 303: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
304: NULL, IPL_SOFTNET);
305:
1.1 cgd 306: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
307: if (pr == 0)
308: panic("ip_init");
309: for (i = 0; i < IPPROTO_MAX; i++)
310: ip_protox[i] = pr - inetsw;
311: for (pr = inetdomain.dom_protosw;
312: pr < inetdomain.dom_protoswNPROTOSW; pr++)
313: if (pr->pr_domain->dom_family == PF_INET &&
314: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
315: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 316:
1.288 rmind 317: ip_reass_init();
1.190 jonathan 318:
1.291 rmind 319: ip_ids = ip_id_init();
1.227 kardel 320: ip_id = time_second & 0xfffff;
1.194 jonathan 321:
1.1 cgd 322: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 323:
1.181 jonathan 324: TAILQ_INIT(&in_ifaddrhead);
1.272 ad 325: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
326: &in_ifaddrhash);
327: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
328: &in_multihash);
1.160 itojun 329: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 330: #ifdef GATEWAY
1.248 liamjfoy 331: ipflow_init(ip_hashsize);
1.73 thorpej 332: #endif
1.121 thorpej 333:
334: #ifdef PFIL_HOOKS
335: /* Register our Packet Filter hook. */
1.126 thorpej 336: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
337: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 338: i = pfil_head_register(&inet_pfil_hook);
339: if (i != 0)
340: printf("ip_init: WARNING: unable to register pfil hook, "
341: "error %d\n", i);
342: #endif /* PFIL_HOOKS */
1.135 thorpej 343:
1.164 matt 344: #ifdef MBUFTRACE
345: MOWNER_ATTACH(&ip_tx_mowner);
346: MOWNER_ATTACH(&ip_rx_mowner);
347: #endif /* MBUFTRACE */
1.266 thorpej 348:
349: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 350: }
351:
1.229 christos 352: struct sockaddr_in ipaddr = {
353: .sin_len = sizeof(ipaddr),
354: .sin_family = AF_INET,
355: };
1.1 cgd 356: struct route ipforward_rt;
357:
358: /*
1.89 itojun 359: * IP software interrupt routine
360: */
361: void
1.211 perry 362: ipintr(void)
1.89 itojun 363: {
364: int s;
365: struct mbuf *m;
1.286 tls 366: struct ifqueue lcl_intrq;
367:
368: memset(&lcl_intrq, 0, sizeof(lcl_intrq));
369: ipintrq.ifq_maxlen = ipqmaxlen;
1.89 itojun 370:
1.268 ad 371: mutex_enter(softnet_lock);
372: KERNEL_LOCK(1, NULL);
1.286 tls 373: if (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 374: s = splnet();
1.286 tls 375:
376: /* Take existing queue onto stack */
377: lcl_intrq = ipintrq;
378:
379: /* Zero out global queue, preserving maxlen and drops */
380: ipintrq.ifq_head = NULL;
381: ipintrq.ifq_tail = NULL;
382: ipintrq.ifq_len = 0;
383: ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
384: ipintrq.ifq_drops = lcl_intrq.ifq_drops;
385:
1.89 itojun 386: splx(s);
1.286 tls 387: }
388: KERNEL_UNLOCK_ONE(NULL);
389: while (!IF_IS_EMPTY(&lcl_intrq)) {
390: IF_DEQUEUE(&lcl_intrq, m);
1.268 ad 391: if (m == NULL)
392: break;
1.292 ! matt 393: KERNEL_UNLOCK_ONE(NULL);
1.89 itojun 394: ip_input(m);
1.292 ! matt 395: KERNEL_LOCK(1, NULL);
1.89 itojun 396: }
1.268 ad 397: mutex_exit(softnet_lock);
1.89 itojun 398: }
399:
400: /*
1.1 cgd 401: * Ip input routine. Checksum and byte swap header. If fragmented
402: * try to reassemble. Process options. Pass to next level.
403: */
1.8 mycroft 404: void
1.89 itojun 405: ip_input(struct mbuf *m)
1.1 cgd 406: {
1.109 augustss 407: struct ip *ip = NULL;
408: struct in_ifaddr *ia;
409: struct ifaddr *ifa;
1.288 rmind 410: int hlen = 0, len;
1.100 itojun 411: int downmatch;
1.165 christos 412: int checkif;
1.169 itojun 413: int srcrt = 0;
1.173 jonathan 414: #ifdef FAST_IPSEC
415: struct m_tag *mtag;
416: struct tdb_ident *tdbi;
417: struct secpolicy *sp;
1.289 rmind 418: int error, s;
1.173 jonathan 419: #endif /* FAST_IPSEC */
1.1 cgd 420:
1.164 matt 421: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 422: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164 matt 423:
1.1 cgd 424: /*
425: * If no IP addresses have been set yet but the interfaces
426: * are receiving, can't do anything with incoming packets yet.
427: */
1.181 jonathan 428: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 429: goto bad;
1.266 thorpej 430: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 431: /*
432: * If the IP header is not aligned, slurp it up into a new
433: * mbuf with space for link headers, in the event we forward
434: * it. Otherwise, if it is aligned, make sure the entire
435: * base IP header is in the first mbuf of the chain.
436: */
1.244 christos 437: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 438: if ((m = m_copyup(m, sizeof(struct ip),
439: (max_linkhdr + 3) & ~3)) == NULL) {
440: /* XXXJRT new stat, please */
1.266 thorpej 441: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 442: return;
443: }
444: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
445: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 446: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 447: return;
448: }
1.1 cgd 449: }
450: ip = mtod(m, struct ip *);
1.13 mycroft 451: if (ip->ip_v != IPVERSION) {
1.266 thorpej 452: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 453: goto bad;
454: }
1.1 cgd 455: hlen = ip->ip_hl << 2;
456: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 457: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 458: goto bad;
459: }
460: if (hlen > m->m_len) {
461: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 462: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 463: return;
1.1 cgd 464: }
465: ip = mtod(m, struct ip *);
466: }
1.98 thorpej 467:
1.85 hwr 468: /*
1.99 thorpej 469: * RFC1122: packets with a multicast source address are
1.98 thorpej 470: * not allowed.
1.85 hwr 471: */
472: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 473: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 474: goto bad;
1.129 itojun 475: }
476:
477: /* 127/8 must not appear on wire - RFC1122 */
478: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
479: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 480: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 481: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 482: goto bad;
1.130 itojun 483: }
1.85 hwr 484: }
485:
1.135 thorpej 486: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 487: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 488: M_CSUM_IPv4_BAD)) {
489: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
490: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
491: goto badcsum;
492:
493: case M_CSUM_IPv4:
494: /* Checksum was okay. */
495: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
496: break;
497:
498: default:
1.206 thorpej 499: /*
500: * Must compute it ourselves. Maybe skip checksum on
501: * loopback interfaces.
502: */
503: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
504: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
505: INET_CSUM_COUNTER_INCR(&ip_swcsum);
506: if (in_cksum(m, hlen) != 0)
507: goto badcsum;
508: }
1.135 thorpej 509: break;
1.1 cgd 510: }
511:
1.121 thorpej 512: /* Retrieve the packet length. */
513: len = ntohs(ip->ip_len);
1.81 proff 514:
515: /*
516: * Check for additional length bogosity
517: */
1.84 proff 518: if (len < hlen) {
1.266 thorpej 519: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 520: goto bad;
521: }
1.1 cgd 522:
523: /*
524: * Check that the amount of data in the buffers
525: * is as at least much as the IP header would have us expect.
526: * Trim mbufs if longer than we expect.
527: * Drop packet if shorter than we expect.
528: */
1.35 mycroft 529: if (m->m_pkthdr.len < len) {
1.266 thorpej 530: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 531: goto bad;
532: }
1.35 mycroft 533: if (m->m_pkthdr.len > len) {
1.1 cgd 534: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 535: m->m_len = len;
536: m->m_pkthdr.len = len;
1.1 cgd 537: } else
1.35 mycroft 538: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 539: }
540:
1.193 scw 541: #if defined(IPSEC)
1.149 wiz 542: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 543: m->m_flags &= ~M_CANFASTFWD;
544: #else
1.64 thorpej 545: /*
546: * Assume that we can create a fast-forward IP flow entry
547: * based on this packet.
548: */
549: m->m_flags |= M_CANFASTFWD;
1.94 itojun 550: #endif
1.64 thorpej 551:
1.36 mrg 552: #ifdef PFIL_HOOKS
1.33 mrg 553: /*
1.64 thorpej 554: * Run through list of hooks for input packets. If there are any
555: * filters which require that additional packets in the flow are
556: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
557: * Note that filters must _never_ set this flag, as another filter
558: * in the list may have previously cleared it.
1.33 mrg 559: */
1.127 itojun 560: /*
561: * let ipfilter look at packet on the wire,
562: * not the decapsulated packet.
563: */
564: #ifdef IPSEC
1.136 itojun 565: if (!ipsec_getnhist(m))
1.186 scw 566: #elif defined(FAST_IPSEC)
567: if (!ipsec_indone(m))
1.127 itojun 568: #else
569: if (1)
570: #endif
571: {
1.169 itojun 572: struct in_addr odst;
573:
574: odst = ip->ip_dst;
1.127 itojun 575: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 576: PFIL_IN) != 0)
577: return;
1.127 itojun 578: if (m == NULL)
579: return;
580: ip = mtod(m, struct ip *);
1.142 darrenr 581: hlen = ip->ip_hl << 2;
1.205 darrenr 582: /*
583: * XXX The setting of "srcrt" here is to prevent ip_forward()
584: * from generating ICMP redirects for packets that have
585: * been redirected by a hook back out on to the same LAN that
586: * they came from and is not an indication that the packet
587: * is being inffluenced by source routing options. This
588: * allows things like
589: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
590: * where tlp0 is both on the 1.1.1.0/24 network and is the
591: * default route for hosts on 1.1.1.0/24. Of course this
592: * also requires a "map tlp0 ..." to complete the story.
593: * One might argue whether or not this kind of network config.
1.212 perry 594: * should be supported in this manner...
1.205 darrenr 595: */
1.169 itojun 596: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 597: }
1.36 mrg 598: #endif /* PFIL_HOOKS */
1.123 thorpej 599:
600: #ifdef ALTQ
601: /* XXX Temporary until ALTQ is changed to use a pfil hook */
602: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
603: /* packet dropped by traffic conditioner */
604: return;
605: }
606: #endif
1.121 thorpej 607:
608: /*
1.1 cgd 609: * Process options and, if not destined for us,
610: * ship it on. ip_dooptions returns 1 when an
611: * error was detected (causing an icmp message
612: * to be sent and the original packet to be freed).
613: */
614: ip_nhops = 0; /* for source routed packets */
615: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 616: return;
1.1 cgd 617:
618: /*
1.165 christos 619: * Enable a consistency check between the destination address
620: * and the arrival interface for a unicast packet (the RFC 1122
621: * strong ES model) if IP forwarding is disabled and the packet
622: * is not locally generated.
623: *
624: * XXX - Checking also should be disabled if the destination
625: * address is ipnat'ed to a different interface.
626: *
627: * XXX - Checking is incompatible with IP aliases added
628: * to the loopback interface instead of the interface where
629: * the packets are received.
630: *
631: * XXX - We need to add a per ifaddr flag for this so that
632: * we get finer grain control.
633: */
634: checkif = ip_checkinterface && (ipforwarding == 0) &&
635: (m->m_pkthdr.rcvif != NULL) &&
636: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
637:
638: /*
1.1 cgd 639: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 640: *
641: * Traditional 4.4BSD did not consult IFF_UP at all.
642: * The behavior here is to treat addresses on !IFF_UP interface
643: * as not mine.
1.1 cgd 644: */
1.100 itojun 645: downmatch = 0;
1.140 matt 646: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 647: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 648: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
649: continue;
1.97 itojun 650: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
651: break;
1.100 itojun 652: else
653: downmatch++;
1.97 itojun 654: }
655: }
1.86 thorpej 656: if (ia != NULL)
657: goto ours;
1.225 christos 658: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 659: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 660: if (ifa->ifa_addr->sa_family != AF_INET)
661: continue;
1.57 tls 662: ia = ifatoia(ifa);
1.35 mycroft 663: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
664: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 665: /*
666: * Look for all-0's host part (old broadcast addr),
667: * either for subnet or net.
668: */
669: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 670: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 671: goto ours;
1.57 tls 672: /*
673: * An interface with IP address zero accepts
674: * all packets that arrive on that interface.
675: */
676: if (in_nullhost(ia->ia_addr.sin_addr))
677: goto ours;
1.1 cgd 678: }
679: }
1.18 mycroft 680: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 681: struct in_multi *inm;
682: #ifdef MROUTING
683: extern struct socket *ip_mrouter;
1.10 brezak 684:
1.4 hpeyerl 685: if (ip_mrouter) {
686: /*
687: * If we are acting as a multicast router, all
688: * incoming multicast packets are passed to the
689: * kernel-level multicast forwarding function.
690: * The packet is returned (relatively) intact; if
691: * ip_mforward() returns a non-zero value, the packet
692: * must be discarded, else it may be accepted below.
693: *
694: * (The IP ident field is put in the same byte order
695: * as expected when ip_mforward() is called from
696: * ip_output().)
697: */
1.13 mycroft 698: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 699: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 700: m_freem(m);
1.89 itojun 701: return;
1.4 hpeyerl 702: }
703:
704: /*
705: * The process-level routing demon needs to receive
706: * all multicast IGMP packets, whether or not this
707: * host belongs to their destination groups.
708: */
709: if (ip->ip_p == IPPROTO_IGMP)
710: goto ours;
1.266 thorpej 711: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 712: }
713: #endif
714: /*
715: * See if we belong to the destination multicast group on the
716: * arrival interface.
717: */
718: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
719: if (inm == NULL) {
1.266 thorpej 720: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 721: m_freem(m);
1.89 itojun 722: return;
1.4 hpeyerl 723: }
724: goto ours;
725: }
1.19 mycroft 726: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 727: in_nullhost(ip->ip_dst))
1.1 cgd 728: goto ours;
729:
730: /*
731: * Not for us; forward if possible and desirable.
732: */
733: if (ipforwarding == 0) {
1.266 thorpej 734: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 735: m_freem(m);
1.100 itojun 736: } else {
737: /*
738: * If ip_dst matched any of my address on !IFF_UP interface,
739: * and there's no IFF_UP interface that matches ip_dst,
740: * send icmp unreach. Forwarding it will result in in-kernel
741: * forwarding loop till TTL goes to 0.
742: */
743: if (downmatch) {
744: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 745: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 746: return;
747: }
1.145 itojun 748: #ifdef IPSEC
749: if (ipsec4_in_reject(m, NULL)) {
1.267 thorpej 750: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 751: goto bad;
752: }
753: #endif
1.173 jonathan 754: #ifdef FAST_IPSEC
755: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
756: s = splsoftnet();
757: if (mtag != NULL) {
758: tdbi = (struct tdb_ident *)(mtag + 1);
759: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
760: } else {
761: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 762: IP_FORWARDING, &error);
1.173 jonathan 763: }
764: if (sp == NULL) { /* NB: can happen if error */
765: splx(s);
766: /*XXX error stat???*/
767: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
768: goto bad;
769: }
770:
771: /*
772: * Check security policy against packet attributes.
773: */
774: error = ipsec_in_reject(sp, m);
775: KEY_FREESP(&sp);
776: splx(s);
777: if (error) {
1.266 thorpej 778: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 779: goto bad;
1.193 scw 780: }
781:
782: /*
783: * Peek at the outbound SP for this packet to determine if
784: * it's a Fast Forward candidate.
785: */
786: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
787: if (mtag != NULL)
788: m->m_flags &= ~M_CANFASTFWD;
789: else {
790: s = splsoftnet();
791: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
792: (IP_FORWARDING |
793: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
794: &error, NULL);
795: if (sp != NULL) {
796: m->m_flags &= ~M_CANFASTFWD;
797: KEY_FREESP(&sp);
798: }
799: splx(s);
1.173 jonathan 800: }
801: #endif /* FAST_IPSEC */
1.145 itojun 802:
1.169 itojun 803: ip_forward(m, srcrt);
1.100 itojun 804: }
1.89 itojun 805: return;
1.1 cgd 806:
807: ours:
808: /*
809: * If offset or IP_MF are set, must reassemble.
810: */
1.155 itojun 811: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 812: /*
813: * Pass to IP reassembly mechanism.
814: */
1.290 rmind 815: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 816: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 817: goto bad;
1.16 cgd 818: }
1.290 rmind 819: if (m == NULL) {
1.289 rmind 820: /* More fragments should come; silently return. */
821: return;
822: }
1.290 rmind 823: /*
824: * Reassembly is done, we have the final packet.
825: * Updated cached data in local variable(s).
826: */
1.289 rmind 827: ip = mtod(m, struct ip *);
828: hlen = ip->ip_hl << 2;
1.79 mycroft 829: }
1.128 itojun 830:
1.173 jonathan 831: #if defined(IPSEC)
1.128 itojun 832: /*
833: * enforce IPsec policy checking if we are seeing last header.
834: * note that we do not visit this with protocols with pcb layer
835: * code - like udp/tcp/raw ip.
836: */
837: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
838: ipsec4_in_reject(m, NULL)) {
1.267 thorpej 839: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 840: goto bad;
841: }
842: #endif
1.226 liamjfoy 843: #ifdef FAST_IPSEC
1.173 jonathan 844: /*
845: * enforce IPsec policy checking if we are seeing last header.
846: * note that we do not visit this with protocols with pcb layer
847: * code - like udp/tcp/raw ip.
848: */
849: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
850: /*
851: * Check if the packet has already had IPsec processing
852: * done. If so, then just pass it along. This tag gets
853: * set during AH, ESP, etc. input handling, before the
854: * packet is returned to the ip input queue for delivery.
1.212 perry 855: */
1.173 jonathan 856: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
857: s = splsoftnet();
858: if (mtag != NULL) {
859: tdbi = (struct tdb_ident *)(mtag + 1);
860: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
861: } else {
862: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 863: IP_FORWARDING, &error);
1.173 jonathan 864: }
865: if (sp != NULL) {
866: /*
867: * Check security policy against packet attributes.
868: */
869: error = ipsec_in_reject(sp, m);
870: KEY_FREESP(&sp);
871: } else {
872: /* XXX error stat??? */
873: error = EINVAL;
874: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
875: }
876: splx(s);
877: if (error)
878: goto bad;
879: }
880: #endif /* FAST_IPSEC */
1.1 cgd 881:
882: /*
883: * Switch out to protocol's input routine.
884: */
1.82 aidan 885: #if IFA_STATS
1.122 itojun 886: if (ia && ip)
1.155 itojun 887: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 888: #endif
1.266 thorpej 889: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 890: {
891: int off = hlen, nh = ip->ip_p;
892:
893: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
894: return;
895: }
1.1 cgd 896: bad:
897: m_freem(m);
1.135 thorpej 898: return;
899:
900: badcsum:
1.266 thorpej 901: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 902: m_freem(m);
1.1 cgd 903: }
904:
905: /*
1.288 rmind 906: * IP timer processing.
1.1 cgd 907: */
1.8 mycroft 908: void
1.211 perry 909: ip_slowtimo(void)
1.1 cgd 910: {
1.268 ad 911:
912: mutex_enter(softnet_lock);
913: KERNEL_LOCK(1, NULL);
1.1 cgd 914:
1.288 rmind 915: ip_reass_slowtimo();
1.268 ad 916:
917: KERNEL_UNLOCK_ONE(NULL);
918: mutex_exit(softnet_lock);
1.1 cgd 919: }
920:
921: /*
1.288 rmind 922: * IP drain processing.
1.1 cgd 923: */
1.8 mycroft 924: void
1.211 perry 925: ip_drain(void)
1.1 cgd 926: {
927:
1.268 ad 928: KERNEL_LOCK(1, NULL);
1.288 rmind 929: ip_reass_drain();
1.268 ad 930: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 931: }
932:
933: /*
934: * Do option processing on a datagram,
935: * possibly discarding it if bad options are encountered,
936: * or forwarding it if source-routed.
937: * Returns 1 if packet has been forwarded/freed,
938: * 0 if the packet should be processed further.
939: */
1.8 mycroft 940: int
1.211 perry 941: ip_dooptions(struct mbuf *m)
1.1 cgd 942: {
1.109 augustss 943: struct ip *ip = mtod(m, struct ip *);
944: u_char *cp, *cp0;
945: struct ip_timestamp *ipt;
946: struct in_ifaddr *ia;
1.1 cgd 947: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 948: struct in_addr dst;
1.1 cgd 949: n_time ntime;
950:
1.13 mycroft 951: dst = ip->ip_dst;
1.1 cgd 952: cp = (u_char *)(ip + 1);
953: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
954: for (; cnt > 0; cnt -= optlen, cp += optlen) {
955: opt = cp[IPOPT_OPTVAL];
956: if (opt == IPOPT_EOL)
957: break;
958: if (opt == IPOPT_NOP)
959: optlen = 1;
960: else {
1.113 itojun 961: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
962: code = &cp[IPOPT_OLEN] - (u_char *)ip;
963: goto bad;
964: }
1.1 cgd 965: optlen = cp[IPOPT_OLEN];
1.114 itojun 966: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 967: code = &cp[IPOPT_OLEN] - (u_char *)ip;
968: goto bad;
969: }
970: }
971: switch (opt) {
972:
973: default:
974: break;
975:
976: /*
977: * Source routing with record.
978: * Find interface with current destination address.
979: * If none on this machine then drop if strictly routed,
980: * or do nothing if loosely routed.
981: * Record interface address and bring up next address
982: * component. If strictly routed make sure next
983: * address is on directly accessible net.
984: */
985: case IPOPT_LSRR:
986: case IPOPT_SSRR:
1.47 cjs 987: if (ip_allowsrcrt == 0) {
988: type = ICMP_UNREACH;
989: code = ICMP_UNREACH_NET_PROHIB;
990: goto bad;
991: }
1.114 itojun 992: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
993: code = &cp[IPOPT_OLEN] - (u_char *)ip;
994: goto bad;
995: }
1.1 cgd 996: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
997: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
998: goto bad;
999: }
1000: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1001: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1002: if (ia == 0) {
1003: if (opt == IPOPT_SSRR) {
1004: type = ICMP_UNREACH;
1005: code = ICMP_UNREACH_SRCFAIL;
1006: goto bad;
1007: }
1008: /*
1009: * Loose routing, and not at next destination
1010: * yet; nothing to do except forward.
1011: */
1012: break;
1013: }
1014: off--; /* 0 origin */
1.112 sommerfe 1015: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1016: /*
1017: * End of source route. Should be for us.
1018: */
1019: save_rte(cp, ip->ip_src);
1020: break;
1021: }
1022: /*
1023: * locate outgoing interface
1024: */
1.281 tsutsui 1025: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 1026: sizeof(ipaddr.sin_addr));
1.96 thorpej 1027: if (opt == IPOPT_SSRR)
1.196 itojun 1028: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1029: else
1.1 cgd 1030: ia = ip_rtaddr(ipaddr.sin_addr);
1031: if (ia == 0) {
1032: type = ICMP_UNREACH;
1033: code = ICMP_UNREACH_SRCFAIL;
1034: goto bad;
1035: }
1036: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1037: bcopy((void *)&ia->ia_addr.sin_addr,
1038: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1039: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1040: /*
1041: * Let ip_intr's mcast routing check handle mcast pkts
1042: */
1.18 mycroft 1043: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1044: break;
1045:
1046: case IPOPT_RR:
1.114 itojun 1047: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1048: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1049: goto bad;
1050: }
1.1 cgd 1051: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1052: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1053: goto bad;
1054: }
1055: /*
1056: * If no space remains, ignore.
1057: */
1058: off--; /* 0 origin */
1.112 sommerfe 1059: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1060: break;
1.281 tsutsui 1061: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1062: sizeof(ipaddr.sin_addr));
1063: /*
1064: * locate outgoing interface; if we're the destination,
1065: * use the incoming interface (should be same).
1066: */
1.96 thorpej 1067: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1068: == NULL &&
1069: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1070: type = ICMP_UNREACH;
1071: code = ICMP_UNREACH_HOST;
1072: goto bad;
1073: }
1.244 christos 1074: bcopy((void *)&ia->ia_addr.sin_addr,
1075: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1076: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1077: break;
1078:
1079: case IPOPT_TS:
1080: code = cp - (u_char *)ip;
1081: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1082: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1083: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1084: goto bad;
1.114 itojun 1085: }
1086: if (ipt->ipt_ptr < 5) {
1087: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1088: goto bad;
1089: }
1.15 cgd 1090: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1091: if (++ipt->ipt_oflw == 0) {
1092: code = (u_char *)&ipt->ipt_ptr -
1093: (u_char *)ip;
1.1 cgd 1094: goto bad;
1.114 itojun 1095: }
1.1 cgd 1096: break;
1097: }
1.104 thorpej 1098: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1099: switch (ipt->ipt_flg) {
1100:
1101: case IPOPT_TS_TSONLY:
1102: break;
1103:
1104: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1105: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1106: sizeof(struct in_addr) > ipt->ipt_len) {
1107: code = (u_char *)&ipt->ipt_ptr -
1108: (u_char *)ip;
1.1 cgd 1109: goto bad;
1.114 itojun 1110: }
1.13 mycroft 1111: ipaddr.sin_addr = dst;
1.96 thorpej 1112: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1113: m->m_pkthdr.rcvif));
1.13 mycroft 1114: if (ia == 0)
1115: continue;
1.104 thorpej 1116: bcopy(&ia->ia_addr.sin_addr,
1117: cp0, sizeof(struct in_addr));
1.1 cgd 1118: ipt->ipt_ptr += sizeof(struct in_addr);
1119: break;
1120:
1121: case IPOPT_TS_PRESPEC:
1.66 thorpej 1122: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1123: sizeof(struct in_addr) > ipt->ipt_len) {
1124: code = (u_char *)&ipt->ipt_ptr -
1125: (u_char *)ip;
1.1 cgd 1126: goto bad;
1.114 itojun 1127: }
1.281 tsutsui 1128: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1129: sizeof(struct in_addr));
1.96 thorpej 1130: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1131: == NULL)
1.1 cgd 1132: continue;
1133: ipt->ipt_ptr += sizeof(struct in_addr);
1134: break;
1135:
1136: default:
1.114 itojun 1137: /* XXX can't take &ipt->ipt_flg */
1138: code = (u_char *)&ipt->ipt_ptr -
1139: (u_char *)ip + 1;
1.1 cgd 1140: goto bad;
1141: }
1142: ntime = iptime();
1.107 thorpej 1143: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1144: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1145: sizeof(n_time));
1146: ipt->ipt_ptr += sizeof(n_time);
1147: }
1148: }
1149: if (forward) {
1.26 thorpej 1150: if (ip_forwsrcrt == 0) {
1151: type = ICMP_UNREACH;
1152: code = ICMP_UNREACH_SRCFAIL;
1153: goto bad;
1154: }
1.1 cgd 1155: ip_forward(m, 1);
1156: return (1);
1.13 mycroft 1157: }
1158: return (0);
1.1 cgd 1159: bad:
1.13 mycroft 1160: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1161: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1162: return (1);
1163: }
1164:
1165: /*
1166: * Given address of next destination (final or next hop),
1167: * return internet address info of interface to be used to get there.
1168: */
1169: struct in_ifaddr *
1.211 perry 1170: ip_rtaddr(struct in_addr dst)
1.1 cgd 1171: {
1.249 dyoung 1172: struct rtentry *rt;
1173: union {
1174: struct sockaddr dst;
1175: struct sockaddr_in dst4;
1176: } u;
1177:
1178: sockaddr_in_init(&u.dst4, &dst, 0);
1179:
1180: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1181: return NULL;
1182:
1183: return ifatoia(rt->rt_ifa);
1.1 cgd 1184: }
1185:
1186: /*
1187: * Save incoming source route for use in replies,
1188: * to be picked up later by ip_srcroute if the receiver is interested.
1189: */
1.13 mycroft 1190: void
1.211 perry 1191: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1192: {
1193: unsigned olen;
1194:
1195: olen = option[IPOPT_OLEN];
1196: #ifdef DIAGNOSTIC
1197: if (ipprintfs)
1.39 christos 1198: printf("save_rte: olen %d\n", olen);
1.89 itojun 1199: #endif /* 0 */
1.1 cgd 1200: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1201: return;
1.281 tsutsui 1202: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1203: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1204: ip_srcrt.dst = dst;
1205: }
1206:
1207: /*
1208: * Retrieve incoming source route for use in replies,
1209: * in the same form used by setsockopt.
1210: * The first hop is placed before the options, will be removed later.
1211: */
1212: struct mbuf *
1.211 perry 1213: ip_srcroute(void)
1.1 cgd 1214: {
1.109 augustss 1215: struct in_addr *p, *q;
1216: struct mbuf *m;
1.1 cgd 1217:
1218: if (ip_nhops == 0)
1.237 dyoung 1219: return NULL;
1.1 cgd 1220: m = m_get(M_DONTWAIT, MT_SOOPTS);
1221: if (m == 0)
1.237 dyoung 1222: return NULL;
1.1 cgd 1223:
1.164 matt 1224: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1225: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1226:
1227: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1228: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1229: OPTSIZ;
1230: #ifdef DIAGNOSTIC
1231: if (ipprintfs)
1.39 christos 1232: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1233: #endif
1234:
1235: /*
1236: * First save first hop for return route
1237: */
1238: p = &ip_srcrt.route[ip_nhops - 1];
1239: *(mtod(m, struct in_addr *)) = *p--;
1240: #ifdef DIAGNOSTIC
1241: if (ipprintfs)
1.39 christos 1242: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1243: #endif
1244:
1245: /*
1246: * Copy option fields and padding (nop) to mbuf.
1247: */
1248: ip_srcrt.nop = IPOPT_NOP;
1249: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1250: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1251: OPTSIZ);
1252: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1253: sizeof(struct in_addr) + OPTSIZ);
1254: #undef OPTSIZ
1255: /*
1256: * Record return path as an IP source route,
1257: * reversing the path (pointers are now aligned).
1258: */
1259: while (p >= ip_srcrt.route) {
1260: #ifdef DIAGNOSTIC
1261: if (ipprintfs)
1.39 christos 1262: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1263: #endif
1264: *q++ = *p--;
1265: }
1266: /*
1267: * Last hop goes to final destination.
1268: */
1269: *q = ip_srcrt.dst;
1270: #ifdef DIAGNOSTIC
1271: if (ipprintfs)
1.39 christos 1272: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1273: #endif
1274: return (m);
1275: }
1276:
1.139 matt 1277: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1278: [PRC_MSGSIZE] = EMSGSIZE,
1279: [PRC_HOSTDEAD] = EHOSTDOWN,
1280: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1281: [PRC_UNREACH_NET] = EHOSTUNREACH,
1282: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1283: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1284: [PRC_UNREACH_PORT] = ECONNREFUSED,
1285: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1286: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1287: };
1288:
1289: /*
1290: * Forward a packet. If some error occurs return the sender
1291: * an icmp packet. Note we can't always generate a meaningful
1292: * icmp message because icmp doesn't have a large enough repertoire
1293: * of codes and types.
1294: *
1295: * If not forwarding, just drop the packet. This could be confusing
1296: * if ipforwarding was zero but some routing protocol was advancing
1297: * us as a gateway to somewhere. However, we must let the routing
1298: * protocol deal with that.
1299: *
1300: * The srcrt parameter indicates whether the packet is being forwarded
1301: * via a source route.
1302: */
1.13 mycroft 1303: void
1.211 perry 1304: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1305: {
1.109 augustss 1306: struct ip *ip = mtod(m, struct ip *);
1307: struct rtentry *rt;
1.220 christos 1308: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1309: struct mbuf *mcopy;
1.13 mycroft 1310: n_long dest;
1.249 dyoung 1311: union {
1312: struct sockaddr dst;
1313: struct sockaddr_in dst4;
1314: } u;
1.164 matt 1315:
1316: /*
1317: * We are now in the output path.
1318: */
1319: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1320:
1321: /*
1322: * Clear any in-bound checksum flags for this packet.
1323: */
1324: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1325:
1.13 mycroft 1326: dest = 0;
1.1 cgd 1327: #ifdef DIAGNOSTIC
1.224 joerg 1328: if (ipprintfs) {
1329: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1330: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1331: }
1.1 cgd 1332: #endif
1.93 sommerfe 1333: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1334: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1335: m_freem(m);
1336: return;
1337: }
1338: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1339: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1340: return;
1341: }
1342:
1.249 dyoung 1343: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1344: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1345: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1346: return;
1.1 cgd 1347: }
1348:
1349: /*
1.34 mycroft 1350: * Save at most 68 bytes of the packet in case
1.1 cgd 1351: * we need to generate an ICMP message to the src.
1.119 itojun 1352: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1353: */
1.155 itojun 1354: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1355: if (mcopy)
1356: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1357:
1.221 christos 1358: ip->ip_ttl -= IPTTLDEC;
1359:
1.1 cgd 1360: /*
1361: * If forwarding packet using same interface that it came in on,
1362: * perhaps should send a redirect to sender to shortcut a hop.
1363: * Only send redirect if source is sending directly to us,
1364: * and if packet was not source routed (or has any options).
1365: * Also, don't send redirect if forwarding using a default route
1366: * or a route modified by a redirect.
1367: */
1368: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1369: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1370: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1371: ipsendredirects && !srcrt) {
1.19 mycroft 1372: if (rt->rt_ifa &&
1373: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1374: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1375: if (rt->rt_flags & RTF_GATEWAY)
1376: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1377: else
1378: dest = ip->ip_dst.s_addr;
1379: /*
1380: * Router requirements says to only send host
1381: * redirects.
1382: */
1383: type = ICMP_REDIRECT;
1384: code = ICMP_REDIRECT_HOST;
1.1 cgd 1385: #ifdef DIAGNOSTIC
1.77 thorpej 1386: if (ipprintfs)
1387: printf("redirect (%d) to %x\n", code,
1388: (u_int32_t)dest);
1.1 cgd 1389: #endif
1390: }
1391: }
1392:
1.238 dyoung 1393: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1394: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1395: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1396:
1.1 cgd 1397: if (error)
1.266 thorpej 1398: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1399: else {
1.266 thorpej 1400: uint64_t *ips = IP_STAT_GETREF();
1401: ips[IP_STAT_FORWARD]++;
1402: if (type) {
1403: ips[IP_STAT_REDIRECTSENT]++;
1404: IP_STAT_PUTREF();
1405: } else {
1406: IP_STAT_PUTREF();
1.63 matt 1407: if (mcopy) {
1408: #ifdef GATEWAY
1.64 thorpej 1409: if (mcopy->m_flags & M_CANFASTFWD)
1410: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1411: #endif
1.1 cgd 1412: m_freem(mcopy);
1.63 matt 1413: }
1.1 cgd 1414: return;
1415: }
1416: }
1417: if (mcopy == NULL)
1418: return;
1.13 mycroft 1419:
1.1 cgd 1420: switch (error) {
1421:
1422: case 0: /* forwarded, but need redirect */
1423: /* type, code set above */
1424: break;
1425:
1426: case ENETUNREACH: /* shouldn't happen, checked above */
1427: case EHOSTUNREACH:
1428: case ENETDOWN:
1429: case EHOSTDOWN:
1430: default:
1431: type = ICMP_UNREACH;
1432: code = ICMP_UNREACH_HOST;
1433: break;
1434:
1435: case EMSGSIZE:
1436: type = ICMP_UNREACH;
1437: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1438:
1.274 seanb 1439: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1440: destmtu = rt->rt_ifp->if_mtu;
1.263 cube 1441:
1442: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274 seanb 1443: {
1.263 cube 1444: /*
1445: * If the packet is routed over IPsec tunnel, tell the
1446: * originator the tunnel MTU.
1447: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1448: * XXX quickhack!!!
1449: */
1450:
1.89 itojun 1451: struct secpolicy *sp;
1452: int ipsecerror;
1.95 itojun 1453: size_t ipsechdr;
1.89 itojun 1454: struct route *ro;
1455:
1456: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1457: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1458: &ipsecerror);
1.89 itojun 1459:
1.263 cube 1460: if (sp != NULL) {
1.89 itojun 1461: /* count IPsec header size */
1.95 itojun 1462: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1463: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1464:
1465: /*
1466: * find the correct route for outer IPv4
1467: * header, compute tunnel MTU.
1468: */
1.220 christos 1469:
1.89 itojun 1470: if (sp->req != NULL
1.95 itojun 1471: && sp->req->sav != NULL
1472: && sp->req->sav->sah != NULL) {
1473: ro = &sp->req->sav->sah->sa_route;
1.274 seanb 1474: rt = rtcache_validate(ro);
1.257 dyoung 1475: if (rt && rt->rt_ifp) {
1.220 christos 1476: destmtu =
1.257 dyoung 1477: rt->rt_rmx.rmx_mtu ?
1478: rt->rt_rmx.rmx_mtu :
1479: rt->rt_ifp->if_mtu;
1.220 christos 1480: destmtu -= ipsechdr;
1.89 itojun 1481: }
1482: }
1483:
1.173 jonathan 1484: #ifdef IPSEC
1.89 itojun 1485: key_freesp(sp);
1.173 jonathan 1486: #else
1487: KEY_FREESP(&sp);
1488: #endif
1.89 itojun 1489: }
1.274 seanb 1490: }
1.263 cube 1491: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266 thorpej 1492: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1493: break;
1494:
1495: case ENOBUFS:
1.143 itojun 1496: #if 1
1497: /*
1498: * a router should not generate ICMP_SOURCEQUENCH as
1499: * required in RFC1812 Requirements for IP Version 4 Routers.
1500: * source quench could be a big problem under DoS attacks,
1.149 wiz 1501: * or if the underlying interface is rate-limited.
1.143 itojun 1502: */
1503: if (mcopy)
1504: m_freem(mcopy);
1505: return;
1506: #else
1.1 cgd 1507: type = ICMP_SOURCEQUENCH;
1508: code = 0;
1509: break;
1.143 itojun 1510: #endif
1.1 cgd 1511: }
1.220 christos 1512: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 1513: }
1514:
1515: void
1.211 perry 1516: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1517: struct mbuf *m)
1.44 thorpej 1518: {
1519:
1.283 minskim 1520: if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278 christos 1521: #ifdef SO_OTIMESTAMP
1.283 minskim 1522: || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278 christos 1523: #endif
1524: ) {
1.44 thorpej 1525: struct timeval tv;
1526:
1527: microtime(&tv);
1.278 christos 1528: #ifdef SO_OTIMESTAMP
1529: if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
1530: struct timeval50 tv50;
1531: timeval_to_timeval50(&tv, &tv50);
1532: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1533: SCM_OTIMESTAMP, SOL_SOCKET);
1534: } else
1535: #endif
1.244 christos 1536: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1537: SCM_TIMESTAMP, SOL_SOCKET);
1538: if (*mp)
1539: mp = &(*mp)->m_next;
1540: }
1541: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 1542: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1543: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1544: if (*mp)
1545: mp = &(*mp)->m_next;
1546: }
1547: #ifdef notyet
1548: /*
1549: * XXX
1550: * Moving these out of udp_input() made them even more broken
1551: * than they already were.
1552: * - fenner@parc.xerox.com
1553: */
1554: /* options were tossed already */
1555: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 1556: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 1557: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1558: if (*mp)
1559: mp = &(*mp)->m_next;
1560: }
1561: /* ip_srcroute doesn't do what we want here, need to fix */
1562: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 1563: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 1564: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1565: if (*mp)
1566: mp = &(*mp)->m_next;
1567: }
1568: #endif
1569: if (inp->inp_flags & INP_RECVIF) {
1570: struct sockaddr_dl sdl;
1571:
1.252 dyoung 1572: sockaddr_dl_init(&sdl, sizeof(sdl),
1573: (m->m_pkthdr.rcvif != NULL)
1574: ? m->m_pkthdr.rcvif->if_index
1575: : 0,
1576: 0, NULL, 0, NULL, 0);
1.251 dyoung 1577: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1578: if (*mp)
1579: mp = &(*mp)->m_next;
1580: }
1.282 minskim 1581: if (inp->inp_flags & INP_RECVTTL) {
1582: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1583: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1584: if (*mp)
1585: mp = &(*mp)->m_next;
1586: }
1.13 mycroft 1587: }
1588:
1.189 atatat 1589: /*
1.228 elad 1590: * sysctl helper routine for net.inet.ip.forwsrcrt.
1591: */
1592: static int
1593: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1594: {
1595: int error, tmp;
1596: struct sysctlnode node;
1597:
1598: node = *rnode;
1599: tmp = ip_forwsrcrt;
1600: node.sysctl_data = &tmp;
1601: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1602: if (error || newp == NULL)
1603: return (error);
1604:
1.280 elad 1605: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1606: 0, NULL, NULL, NULL);
1607: if (error)
1608: return (error);
1.228 elad 1609:
1610: ip_forwsrcrt = tmp;
1611:
1612: return (0);
1613: }
1614:
1615: /*
1.189 atatat 1616: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1617: * range of the new value and tweaks timers if it changes.
1618: */
1619: static int
1620: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1621: {
1.189 atatat 1622: int error, tmp;
1623: struct sysctlnode node;
1624:
1625: node = *rnode;
1626: tmp = ip_mtudisc_timeout;
1627: node.sysctl_data = &tmp;
1628: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1629: if (error || newp == NULL)
1630: return (error);
1631: if (tmp < 0)
1632: return (EINVAL);
1.52 thorpej 1633:
1.273 matt 1634: mutex_enter(softnet_lock);
1635:
1.189 atatat 1636: ip_mtudisc_timeout = tmp;
1637: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1638:
1.273 matt 1639: mutex_exit(softnet_lock);
1640:
1.189 atatat 1641: return (0);
1642: }
1.54 lukem 1643:
1.65 matt 1644: #ifdef GATEWAY
1.189 atatat 1645: /*
1.247 liamjfoy 1646: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 1647: */
1648: static int
1649: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
1650: {
1.273 matt 1651: int error;
1.67 thorpej 1652:
1.273 matt 1653: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1654: if (error || newp == NULL)
1655: return (error);
1656:
1657: mutex_enter(softnet_lock);
1658: KERNEL_LOCK(1, NULL);
1.212 perry 1659:
1.265 thorpej 1660: ipflow_prune();
1.273 matt 1661:
1662: KERNEL_UNLOCK_ONE(NULL);
1663: mutex_exit(softnet_lock);
1.144 martin 1664:
1.189 atatat 1665: return (0);
1666: }
1.248 liamjfoy 1667:
1668: static int
1669: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283 minskim 1670: {
1.248 liamjfoy 1671: int error, tmp;
1672: struct sysctlnode node;
1673:
1674: node = *rnode;
1675: tmp = ip_hashsize;
1676: node.sysctl_data = &tmp;
1677: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1678: if (error || newp == NULL)
1679: return (error);
1680:
1681: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1682: /*
1683: * Can only fail due to malloc()
1684: */
1.273 matt 1685: mutex_enter(softnet_lock);
1686: KERNEL_LOCK(1, NULL);
1687:
1688: error = ipflow_invalidate_all(tmp);
1689:
1690: KERNEL_UNLOCK_ONE(NULL);
1691: mutex_exit(softnet_lock);
1692:
1.248 liamjfoy 1693: } else {
1694: /*
1695: * EINVAL if not a power of 2
1696: */
1.273 matt 1697: error = EINVAL;
1.283 minskim 1698: }
1.248 liamjfoy 1699:
1.273 matt 1700: return error;
1.248 liamjfoy 1701: }
1.189 atatat 1702: #endif /* GATEWAY */
1.117 tron 1703:
1.266 thorpej 1704: static int
1705: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1706: {
1707:
1.271 thorpej 1708: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1709: }
1.131 itojun 1710:
1.284 pooka 1711: static void
1712: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1713: {
1714: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 1715:
1.197 atatat 1716: sysctl_createv(clog, 0, NULL, NULL,
1717: CTLFLAG_PERMANENT,
1.189 atatat 1718: CTLTYPE_NODE, "net", NULL,
1719: NULL, 0, NULL, 0,
1720: CTL_NET, CTL_EOL);
1.197 atatat 1721: sysctl_createv(clog, 0, NULL, NULL,
1722: CTLFLAG_PERMANENT,
1.203 atatat 1723: CTLTYPE_NODE, "inet",
1724: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1725: NULL, 0, NULL, 0,
1726: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1727: sysctl_createv(clog, 0, NULL, NULL,
1728: CTLFLAG_PERMANENT,
1.203 atatat 1729: CTLTYPE_NODE, "ip",
1730: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1731: NULL, 0, NULL, 0,
1732: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1733:
1.197 atatat 1734: sysctl_createv(clog, 0, NULL, NULL,
1735: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1736: CTLTYPE_INT, "forwarding",
1737: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1738: NULL, 0, &ipforwarding, 0,
1739: CTL_NET, PF_INET, IPPROTO_IP,
1740: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1741: sysctl_createv(clog, 0, NULL, NULL,
1742: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1743: CTLTYPE_INT, "redirect",
1744: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1745: NULL, 0, &ipsendredirects, 0,
1746: CTL_NET, PF_INET, IPPROTO_IP,
1747: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1748: sysctl_createv(clog, 0, NULL, NULL,
1749: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1750: CTLTYPE_INT, "ttl",
1751: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1752: NULL, 0, &ip_defttl, 0,
1753: CTL_NET, PF_INET, IPPROTO_IP,
1754: IPCTL_DEFTTL, CTL_EOL);
1755: #ifdef IPCTL_DEFMTU
1.197 atatat 1756: sysctl_createv(clog, 0, NULL, NULL,
1757: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1758: CTLTYPE_INT, "mtu",
1759: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1760: NULL, 0, &ip_mtu, 0,
1761: CTL_NET, PF_INET, IPPROTO_IP,
1762: IPCTL_DEFMTU, CTL_EOL);
1763: #endif /* IPCTL_DEFMTU */
1.197 atatat 1764: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1765: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1766: CTLTYPE_INT, "forwsrcrt",
1767: SYSCTL_DESCR("Enable forwarding of source-routed "
1768: "datagrams"),
1.228 elad 1769: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1770: CTL_NET, PF_INET, IPPROTO_IP,
1771: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1772: sysctl_createv(clog, 0, NULL, NULL,
1773: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1774: CTLTYPE_INT, "directed-broadcast",
1775: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1776: NULL, 0, &ip_directedbcast, 0,
1777: CTL_NET, PF_INET, IPPROTO_IP,
1778: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1779: sysctl_createv(clog, 0, NULL, NULL,
1780: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1781: CTLTYPE_INT, "allowsrcrt",
1782: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1783: NULL, 0, &ip_allowsrcrt, 0,
1784: CTL_NET, PF_INET, IPPROTO_IP,
1785: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 1786: sysctl_createv(clog, 0, NULL, NULL,
1787: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1788: CTLTYPE_INT, "subnetsarelocal",
1789: SYSCTL_DESCR("Whether logical subnets are considered "
1790: "local"),
1.189 atatat 1791: NULL, 0, &subnetsarelocal, 0,
1792: CTL_NET, PF_INET, IPPROTO_IP,
1793: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 1794: sysctl_createv(clog, 0, NULL, NULL,
1795: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1796: CTLTYPE_INT, "mtudisc",
1797: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1798: NULL, 0, &ip_mtudisc, 0,
1799: CTL_NET, PF_INET, IPPROTO_IP,
1800: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1801: sysctl_createv(clog, 0, NULL, NULL,
1802: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1803: CTLTYPE_INT, "anonportmin",
1804: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1805: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1806: CTL_NET, PF_INET, IPPROTO_IP,
1807: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1808: sysctl_createv(clog, 0, NULL, NULL,
1809: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1810: CTLTYPE_INT, "anonportmax",
1811: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1812: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1813: CTL_NET, PF_INET, IPPROTO_IP,
1814: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1815: sysctl_createv(clog, 0, NULL, NULL,
1816: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1817: CTLTYPE_INT, "mtudisctimeout",
1818: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 1819: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
1820: CTL_NET, PF_INET, IPPROTO_IP,
1821: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1822: #ifdef GATEWAY
1.197 atatat 1823: sysctl_createv(clog, 0, NULL, NULL,
1824: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1825: CTLTYPE_INT, "maxflows",
1826: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 1827: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
1828: CTL_NET, PF_INET, IPPROTO_IP,
1829: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 1830: sysctl_createv(clog, 0, NULL, NULL,
1831: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1832: CTLTYPE_INT, "hashsize",
1833: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
1834: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
1835: CTL_NET, PF_INET, IPPROTO_IP,
1836: CTL_CREATE, CTL_EOL);
1.189 atatat 1837: #endif /* GATEWAY */
1.197 atatat 1838: sysctl_createv(clog, 0, NULL, NULL,
1839: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1840: CTLTYPE_INT, "hostzerobroadcast",
1841: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 1842: NULL, 0, &hostzeroisbroadcast, 0,
1843: CTL_NET, PF_INET, IPPROTO_IP,
1844: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
1845: #if NGIF > 0
1.197 atatat 1846: sysctl_createv(clog, 0, NULL, NULL,
1847: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1848: CTLTYPE_INT, "gifttl",
1849: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 1850: NULL, 0, &ip_gif_ttl, 0,
1851: CTL_NET, PF_INET, IPPROTO_IP,
1852: IPCTL_GIF_TTL, CTL_EOL);
1853: #endif /* NGIF */
1854: #ifndef IPNOPRIVPORTS
1.197 atatat 1855: sysctl_createv(clog, 0, NULL, NULL,
1856: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1857: CTLTYPE_INT, "lowportmin",
1858: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1859: "to assign"),
1.189 atatat 1860: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1861: CTL_NET, PF_INET, IPPROTO_IP,
1862: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1863: sysctl_createv(clog, 0, NULL, NULL,
1864: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1865: CTLTYPE_INT, "lowportmax",
1866: SYSCTL_DESCR("Highest privileged ephemeral port number "
1867: "to assign"),
1.189 atatat 1868: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1869: CTL_NET, PF_INET, IPPROTO_IP,
1870: IPCTL_LOWPORTMAX, CTL_EOL);
1871: #endif /* IPNOPRIVPORTS */
1872: #if NGRE > 0
1.197 atatat 1873: sysctl_createv(clog, 0, NULL, NULL,
1874: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1875: CTLTYPE_INT, "grettl",
1876: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1877: NULL, 0, &ip_gre_ttl, 0,
1878: CTL_NET, PF_INET, IPPROTO_IP,
1879: IPCTL_GRE_TTL, CTL_EOL);
1880: #endif /* NGRE */
1.197 atatat 1881: sysctl_createv(clog, 0, NULL, NULL,
1882: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1883: CTLTYPE_INT, "checkinterface",
1884: SYSCTL_DESCR("Enable receive side of Strong ES model "
1885: "from RFC1122"),
1.189 atatat 1886: NULL, 0, &ip_checkinterface, 0,
1887: CTL_NET, PF_INET, IPPROTO_IP,
1888: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1889: sysctl_createv(clog, 0, NULL, NULL,
1890: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1891: CTLTYPE_INT, "random_id",
1892: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1893: NULL, 0, &ip_do_randomid, 0,
1894: CTL_NET, PF_INET, IPPROTO_IP,
1895: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1896: sysctl_createv(clog, 0, NULL, NULL,
1897: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1898: CTLTYPE_INT, "do_loopback_cksum",
1899: SYSCTL_DESCR("Perform IP checksum on loopback"),
1900: NULL, 0, &ip_do_loopback_cksum, 0,
1901: CTL_NET, PF_INET, IPPROTO_IP,
1902: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1903: sysctl_createv(clog, 0, NULL, NULL,
1904: CTLFLAG_PERMANENT,
1905: CTLTYPE_STRUCT, "stats",
1906: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1907: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1908: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1909: CTL_EOL);
1.1 cgd 1910: }
1.266 thorpej 1911:
1912: void
1913: ip_statinc(u_int stat)
1914: {
1915:
1916: KASSERT(stat < IP_NSTATS);
1917: IP_STATINC(stat);
1918: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to ip_input.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / sys / netinet