Annotation of src/sys/netinet/ip_input.c, Revision 1.289
1.289 ! rmind 1: /* $NetBSD: ip_input.c,v 1.288 2010/07/13 22:16:10 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>
1.289 ! rmind 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.288 2010/07/13 22:16:10 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:
1.183 jonathan 234: uint16_t ip_id;
1.75 thorpej 235:
1.266 thorpej 236: percpu_t *ipstat_percpu;
237:
1.121 thorpej 238: #ifdef PFIL_HOOKS
239: struct pfil_head inet_pfil_hook;
240: #endif
241:
1.275 pooka 242: struct pool inmulti_pool;
1.72 thorpej 243:
1.135 thorpej 244: #ifdef INET_CSUM_COUNTERS
245: #include <sys/device.h>
246:
247: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
248: NULL, "inet", "hwcsum bad");
249: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
250: NULL, "inet", "hwcsum ok");
251: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
252: NULL, "inet", "swcsum");
253:
254: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
255:
1.201 matt 256: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
257: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
258: EVCNT_ATTACH_STATIC(ip_swcsum);
259:
1.135 thorpej 260: #else
261:
262: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
263:
264: #endif /* INET_CSUM_COUNTERS */
265:
1.1 cgd 266: /*
267: * We need to save the IP options in case a protocol wants to respond
268: * to an incoming packet over the same route if the packet got here
269: * using IP source routing. This allows connection establishment and
270: * maintenance when the remote end is on a network that is not known
271: * to us.
272: */
273: int ip_nhops = 0;
274: static struct ip_srcrt {
275: struct in_addr dst; /* final destination */
276: char nop; /* one NOP to align */
277: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
278: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
279: } ip_srcrt;
280:
1.210 perry 281: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 282:
1.164 matt 283: #ifdef MBUFTRACE
1.234 dogcow 284: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
285: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 286: #endif
287:
1.284 pooka 288: static void sysctl_net_inet_ip_setup(struct sysctllog **);
289:
1.1 cgd 290: /*
291: * IP initialization: fill in IP protocol switch table.
292: * All protocols not implemented in kernel go to raw IP protocol handler.
293: */
1.8 mycroft 294: void
1.211 perry 295: ip_init(void)
1.1 cgd 296: {
1.199 matt 297: const struct protosw *pr;
1.109 augustss 298: int i;
1.1 cgd 299:
1.284 pooka 300: sysctl_net_inet_ip_setup(NULL);
301:
1.275 pooka 302: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
303: NULL, IPL_SOFTNET);
304:
1.1 cgd 305: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
306: if (pr == 0)
307: panic("ip_init");
308: for (i = 0; i < IPPROTO_MAX; i++)
309: ip_protox[i] = pr - inetsw;
310: for (pr = inetdomain.dom_protosw;
311: pr < inetdomain.dom_protoswNPROTOSW; pr++)
312: if (pr->pr_domain->dom_family == PF_INET &&
313: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
314: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 315:
1.288 rmind 316: ip_reass_init();
1.190 jonathan 317:
1.262 matt 318: ip_initid();
1.227 kardel 319: ip_id = time_second & 0xfffff;
1.194 jonathan 320:
1.1 cgd 321: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 322:
1.181 jonathan 323: TAILQ_INIT(&in_ifaddrhead);
1.272 ad 324: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
325: &in_ifaddrhash);
326: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
327: &in_multihash);
1.160 itojun 328: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 329: #ifdef GATEWAY
1.248 liamjfoy 330: ipflow_init(ip_hashsize);
1.73 thorpej 331: #endif
1.121 thorpej 332:
333: #ifdef PFIL_HOOKS
334: /* Register our Packet Filter hook. */
1.126 thorpej 335: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
336: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 337: i = pfil_head_register(&inet_pfil_hook);
338: if (i != 0)
339: printf("ip_init: WARNING: unable to register pfil hook, "
340: "error %d\n", i);
341: #endif /* PFIL_HOOKS */
1.135 thorpej 342:
1.164 matt 343: #ifdef MBUFTRACE
344: MOWNER_ATTACH(&ip_tx_mowner);
345: MOWNER_ATTACH(&ip_rx_mowner);
346: #endif /* MBUFTRACE */
1.266 thorpej 347:
348: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 349: }
350:
1.229 christos 351: struct sockaddr_in ipaddr = {
352: .sin_len = sizeof(ipaddr),
353: .sin_family = AF_INET,
354: };
1.1 cgd 355: struct route ipforward_rt;
356:
357: /*
1.89 itojun 358: * IP software interrupt routine
359: */
360: void
1.211 perry 361: ipintr(void)
1.89 itojun 362: {
363: int s;
364: struct mbuf *m;
1.286 tls 365: struct ifqueue lcl_intrq;
366:
367: memset(&lcl_intrq, 0, sizeof(lcl_intrq));
368: ipintrq.ifq_maxlen = ipqmaxlen;
1.89 itojun 369:
1.268 ad 370: mutex_enter(softnet_lock);
371: KERNEL_LOCK(1, NULL);
1.286 tls 372: if (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 373: s = splnet();
1.286 tls 374:
375: /* Take existing queue onto stack */
376: lcl_intrq = ipintrq;
377:
378: /* Zero out global queue, preserving maxlen and drops */
379: ipintrq.ifq_head = NULL;
380: ipintrq.ifq_tail = NULL;
381: ipintrq.ifq_len = 0;
382: ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
383: ipintrq.ifq_drops = lcl_intrq.ifq_drops;
384:
1.89 itojun 385: splx(s);
1.286 tls 386: }
387: KERNEL_UNLOCK_ONE(NULL);
388: while (!IF_IS_EMPTY(&lcl_intrq)) {
389: IF_DEQUEUE(&lcl_intrq, m);
1.268 ad 390: if (m == NULL)
391: break;
1.89 itojun 392: ip_input(m);
393: }
1.268 ad 394: mutex_exit(softnet_lock);
1.89 itojun 395: }
396:
397: /*
1.1 cgd 398: * Ip input routine. Checksum and byte swap header. If fragmented
399: * try to reassemble. Process options. Pass to next level.
400: */
1.8 mycroft 401: void
1.89 itojun 402: ip_input(struct mbuf *m)
1.1 cgd 403: {
1.109 augustss 404: struct ip *ip = NULL;
405: struct in_ifaddr *ia;
406: struct ifaddr *ifa;
1.288 rmind 407: int hlen = 0, len;
1.100 itojun 408: int downmatch;
1.165 christos 409: int checkif;
1.169 itojun 410: int srcrt = 0;
1.173 jonathan 411: #ifdef FAST_IPSEC
412: struct m_tag *mtag;
413: struct tdb_ident *tdbi;
414: struct secpolicy *sp;
1.289 ! rmind 415: int error, s;
1.173 jonathan 416: #endif /* FAST_IPSEC */
1.1 cgd 417:
1.164 matt 418: MCLAIM(m, &ip_rx_mowner);
1.289 ! rmind 419: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164 matt 420:
1.1 cgd 421: /*
422: * If no IP addresses have been set yet but the interfaces
423: * are receiving, can't do anything with incoming packets yet.
424: */
1.181 jonathan 425: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 426: goto bad;
1.266 thorpej 427: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 428: /*
429: * If the IP header is not aligned, slurp it up into a new
430: * mbuf with space for link headers, in the event we forward
431: * it. Otherwise, if it is aligned, make sure the entire
432: * base IP header is in the first mbuf of the chain.
433: */
1.244 christos 434: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 435: if ((m = m_copyup(m, sizeof(struct ip),
436: (max_linkhdr + 3) & ~3)) == NULL) {
437: /* XXXJRT new stat, please */
1.266 thorpej 438: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 439: return;
440: }
441: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
442: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 443: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 444: return;
445: }
1.1 cgd 446: }
447: ip = mtod(m, struct ip *);
1.13 mycroft 448: if (ip->ip_v != IPVERSION) {
1.266 thorpej 449: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 450: goto bad;
451: }
1.1 cgd 452: hlen = ip->ip_hl << 2;
453: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 454: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 455: goto bad;
456: }
457: if (hlen > m->m_len) {
458: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 459: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 460: return;
1.1 cgd 461: }
462: ip = mtod(m, struct ip *);
463: }
1.98 thorpej 464:
1.85 hwr 465: /*
1.99 thorpej 466: * RFC1122: packets with a multicast source address are
1.98 thorpej 467: * not allowed.
1.85 hwr 468: */
469: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 470: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 471: goto bad;
1.129 itojun 472: }
473:
474: /* 127/8 must not appear on wire - RFC1122 */
475: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
476: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 477: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 478: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 479: goto bad;
1.130 itojun 480: }
1.85 hwr 481: }
482:
1.135 thorpej 483: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 484: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 485: M_CSUM_IPv4_BAD)) {
486: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
487: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
488: goto badcsum;
489:
490: case M_CSUM_IPv4:
491: /* Checksum was okay. */
492: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
493: break;
494:
495: default:
1.206 thorpej 496: /*
497: * Must compute it ourselves. Maybe skip checksum on
498: * loopback interfaces.
499: */
500: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
501: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
502: INET_CSUM_COUNTER_INCR(&ip_swcsum);
503: if (in_cksum(m, hlen) != 0)
504: goto badcsum;
505: }
1.135 thorpej 506: break;
1.1 cgd 507: }
508:
1.121 thorpej 509: /* Retrieve the packet length. */
510: len = ntohs(ip->ip_len);
1.81 proff 511:
512: /*
513: * Check for additional length bogosity
514: */
1.84 proff 515: if (len < hlen) {
1.266 thorpej 516: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 517: goto bad;
518: }
1.1 cgd 519:
520: /*
521: * Check that the amount of data in the buffers
522: * is as at least much as the IP header would have us expect.
523: * Trim mbufs if longer than we expect.
524: * Drop packet if shorter than we expect.
525: */
1.35 mycroft 526: if (m->m_pkthdr.len < len) {
1.266 thorpej 527: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 528: goto bad;
529: }
1.35 mycroft 530: if (m->m_pkthdr.len > len) {
1.1 cgd 531: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 532: m->m_len = len;
533: m->m_pkthdr.len = len;
1.1 cgd 534: } else
1.35 mycroft 535: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 536: }
537:
1.193 scw 538: #if defined(IPSEC)
1.149 wiz 539: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 540: m->m_flags &= ~M_CANFASTFWD;
541: #else
1.64 thorpej 542: /*
543: * Assume that we can create a fast-forward IP flow entry
544: * based on this packet.
545: */
546: m->m_flags |= M_CANFASTFWD;
1.94 itojun 547: #endif
1.64 thorpej 548:
1.36 mrg 549: #ifdef PFIL_HOOKS
1.33 mrg 550: /*
1.64 thorpej 551: * Run through list of hooks for input packets. If there are any
552: * filters which require that additional packets in the flow are
553: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
554: * Note that filters must _never_ set this flag, as another filter
555: * in the list may have previously cleared it.
1.33 mrg 556: */
1.127 itojun 557: /*
558: * let ipfilter look at packet on the wire,
559: * not the decapsulated packet.
560: */
561: #ifdef IPSEC
1.136 itojun 562: if (!ipsec_getnhist(m))
1.186 scw 563: #elif defined(FAST_IPSEC)
564: if (!ipsec_indone(m))
1.127 itojun 565: #else
566: if (1)
567: #endif
568: {
1.169 itojun 569: struct in_addr odst;
570:
571: odst = ip->ip_dst;
1.127 itojun 572: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 573: PFIL_IN) != 0)
574: return;
1.127 itojun 575: if (m == NULL)
576: return;
577: ip = mtod(m, struct ip *);
1.142 darrenr 578: hlen = ip->ip_hl << 2;
1.205 darrenr 579: /*
580: * XXX The setting of "srcrt" here is to prevent ip_forward()
581: * from generating ICMP redirects for packets that have
582: * been redirected by a hook back out on to the same LAN that
583: * they came from and is not an indication that the packet
584: * is being inffluenced by source routing options. This
585: * allows things like
586: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
587: * where tlp0 is both on the 1.1.1.0/24 network and is the
588: * default route for hosts on 1.1.1.0/24. Of course this
589: * also requires a "map tlp0 ..." to complete the story.
590: * One might argue whether or not this kind of network config.
1.212 perry 591: * should be supported in this manner...
1.205 darrenr 592: */
1.169 itojun 593: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 594: }
1.36 mrg 595: #endif /* PFIL_HOOKS */
1.123 thorpej 596:
597: #ifdef ALTQ
598: /* XXX Temporary until ALTQ is changed to use a pfil hook */
599: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
600: /* packet dropped by traffic conditioner */
601: return;
602: }
603: #endif
1.121 thorpej 604:
605: /*
1.1 cgd 606: * Process options and, if not destined for us,
607: * ship it on. ip_dooptions returns 1 when an
608: * error was detected (causing an icmp message
609: * to be sent and the original packet to be freed).
610: */
611: ip_nhops = 0; /* for source routed packets */
612: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 613: return;
1.1 cgd 614:
615: /*
1.165 christos 616: * Enable a consistency check between the destination address
617: * and the arrival interface for a unicast packet (the RFC 1122
618: * strong ES model) if IP forwarding is disabled and the packet
619: * is not locally generated.
620: *
621: * XXX - Checking also should be disabled if the destination
622: * address is ipnat'ed to a different interface.
623: *
624: * XXX - Checking is incompatible with IP aliases added
625: * to the loopback interface instead of the interface where
626: * the packets are received.
627: *
628: * XXX - We need to add a per ifaddr flag for this so that
629: * we get finer grain control.
630: */
631: checkif = ip_checkinterface && (ipforwarding == 0) &&
632: (m->m_pkthdr.rcvif != NULL) &&
633: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
634:
635: /*
1.1 cgd 636: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 637: *
638: * Traditional 4.4BSD did not consult IFF_UP at all.
639: * The behavior here is to treat addresses on !IFF_UP interface
640: * as not mine.
1.1 cgd 641: */
1.100 itojun 642: downmatch = 0;
1.140 matt 643: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 644: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 645: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
646: continue;
1.97 itojun 647: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
648: break;
1.100 itojun 649: else
650: downmatch++;
1.97 itojun 651: }
652: }
1.86 thorpej 653: if (ia != NULL)
654: goto ours;
1.225 christos 655: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 656: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 657: if (ifa->ifa_addr->sa_family != AF_INET)
658: continue;
1.57 tls 659: ia = ifatoia(ifa);
1.35 mycroft 660: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
661: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 662: /*
663: * Look for all-0's host part (old broadcast addr),
664: * either for subnet or net.
665: */
666: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 667: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 668: goto ours;
1.57 tls 669: /*
670: * An interface with IP address zero accepts
671: * all packets that arrive on that interface.
672: */
673: if (in_nullhost(ia->ia_addr.sin_addr))
674: goto ours;
1.1 cgd 675: }
676: }
1.18 mycroft 677: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 678: struct in_multi *inm;
679: #ifdef MROUTING
680: extern struct socket *ip_mrouter;
1.10 brezak 681:
1.4 hpeyerl 682: if (ip_mrouter) {
683: /*
684: * If we are acting as a multicast router, all
685: * incoming multicast packets are passed to the
686: * kernel-level multicast forwarding function.
687: * The packet is returned (relatively) intact; if
688: * ip_mforward() returns a non-zero value, the packet
689: * must be discarded, else it may be accepted below.
690: *
691: * (The IP ident field is put in the same byte order
692: * as expected when ip_mforward() is called from
693: * ip_output().)
694: */
1.13 mycroft 695: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 696: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 697: m_freem(m);
1.89 itojun 698: return;
1.4 hpeyerl 699: }
700:
701: /*
702: * The process-level routing demon needs to receive
703: * all multicast IGMP packets, whether or not this
704: * host belongs to their destination groups.
705: */
706: if (ip->ip_p == IPPROTO_IGMP)
707: goto ours;
1.266 thorpej 708: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 709: }
710: #endif
711: /*
712: * See if we belong to the destination multicast group on the
713: * arrival interface.
714: */
715: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
716: if (inm == NULL) {
1.266 thorpej 717: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 718: m_freem(m);
1.89 itojun 719: return;
1.4 hpeyerl 720: }
721: goto ours;
722: }
1.19 mycroft 723: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 724: in_nullhost(ip->ip_dst))
1.1 cgd 725: goto ours;
726:
727: /*
728: * Not for us; forward if possible and desirable.
729: */
730: if (ipforwarding == 0) {
1.266 thorpej 731: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 732: m_freem(m);
1.100 itojun 733: } else {
734: /*
735: * If ip_dst matched any of my address on !IFF_UP interface,
736: * and there's no IFF_UP interface that matches ip_dst,
737: * send icmp unreach. Forwarding it will result in in-kernel
738: * forwarding loop till TTL goes to 0.
739: */
740: if (downmatch) {
741: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 742: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 743: return;
744: }
1.145 itojun 745: #ifdef IPSEC
746: if (ipsec4_in_reject(m, NULL)) {
1.267 thorpej 747: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 748: goto bad;
749: }
750: #endif
1.173 jonathan 751: #ifdef FAST_IPSEC
752: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
753: s = splsoftnet();
754: if (mtag != NULL) {
755: tdbi = (struct tdb_ident *)(mtag + 1);
756: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
757: } else {
758: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 759: IP_FORWARDING, &error);
1.173 jonathan 760: }
761: if (sp == NULL) { /* NB: can happen if error */
762: splx(s);
763: /*XXX error stat???*/
764: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
765: goto bad;
766: }
767:
768: /*
769: * Check security policy against packet attributes.
770: */
771: error = ipsec_in_reject(sp, m);
772: KEY_FREESP(&sp);
773: splx(s);
774: if (error) {
1.266 thorpej 775: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 776: goto bad;
1.193 scw 777: }
778:
779: /*
780: * Peek at the outbound SP for this packet to determine if
781: * it's a Fast Forward candidate.
782: */
783: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
784: if (mtag != NULL)
785: m->m_flags &= ~M_CANFASTFWD;
786: else {
787: s = splsoftnet();
788: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
789: (IP_FORWARDING |
790: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
791: &error, NULL);
792: if (sp != NULL) {
793: m->m_flags &= ~M_CANFASTFWD;
794: KEY_FREESP(&sp);
795: }
796: splx(s);
1.173 jonathan 797: }
798: #endif /* FAST_IPSEC */
1.145 itojun 799:
1.169 itojun 800: ip_forward(m, srcrt);
1.100 itojun 801: }
1.89 itojun 802: return;
1.1 cgd 803:
804: ours:
805: /*
806: * If offset or IP_MF are set, must reassemble.
807: */
1.155 itojun 808: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 ! rmind 809: struct mbuf *m_final;
! 810: u_int off, flen;
1.288 rmind 811: bool mff;
812:
1.258 matt 813: /*
814: * Prevent TCP blind data attacks by not allowing non-initial
815: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 816: * size) and making sure the first fragment is at least 68
817: * bytes.
1.258 matt 818: */
1.260 matt 819: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 820: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266 thorpej 821: IP_STATINC(IP_STAT_BADFRAGS);
1.258 matt 822: goto bad;
823: }
1.1 cgd 824:
1.289 ! rmind 825: /* Fragment length and MF flag. */
! 826: flen = ntohs(ip->ip_len) - hlen;
1.155 itojun 827: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 828: if (mff) {
1.287 rmind 829: /*
830: * Make sure that fragments have a data length
1.288 rmind 831: * which is non-zero and multiple of 8 bytes.
1.287 rmind 832: */
1.289 ! rmind 833: if (flen == 0 || (flen & 0x7) != 0) {
1.266 thorpej 834: IP_STATINC(IP_STAT_BADFRAGS);
1.287 rmind 835: goto bad;
836: }
837: }
838:
1.289 ! rmind 839: /*
! 840: * Adjust total IP length to not reflect header and convert
! 841: * offset of this to bytes. XXX: clobbers struct ip.
! 842: */
! 843: ip->ip_len = htons(flen);
! 844: ip->ip_off = htons(off);
1.288 rmind 845:
1.289 ! rmind 846: /*
! 847: * Pass to IP reassembly mechanism.
! 848: */
! 849: if (ip_reass_packet(m, ip, mff, &m_final) != 0) {
! 850: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 851: goto bad;
1.16 cgd 852: }
1.289 ! rmind 853: if (m_final == NULL) {
! 854: /* More fragments should come; silently return. */
! 855: return;
! 856: }
! 857: /* Reassembly is done, we have the final packet. */
! 858: m = m_final;
1.1 cgd 859:
1.289 ! rmind 860: /* Updated local variable(s). */
! 861: ip = mtod(m, struct ip *);
! 862: hlen = ip->ip_hl << 2;
1.79 mycroft 863: }
1.128 itojun 864:
1.173 jonathan 865: #if defined(IPSEC)
1.128 itojun 866: /*
867: * enforce IPsec policy checking if we are seeing last header.
868: * note that we do not visit this with protocols with pcb layer
869: * code - like udp/tcp/raw ip.
870: */
871: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
872: ipsec4_in_reject(m, NULL)) {
1.267 thorpej 873: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 874: goto bad;
875: }
876: #endif
1.226 liamjfoy 877: #ifdef FAST_IPSEC
1.173 jonathan 878: /*
879: * enforce IPsec policy checking if we are seeing last header.
880: * note that we do not visit this with protocols with pcb layer
881: * code - like udp/tcp/raw ip.
882: */
883: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
884: /*
885: * Check if the packet has already had IPsec processing
886: * done. If so, then just pass it along. This tag gets
887: * set during AH, ESP, etc. input handling, before the
888: * packet is returned to the ip input queue for delivery.
1.212 perry 889: */
1.173 jonathan 890: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
891: s = splsoftnet();
892: if (mtag != NULL) {
893: tdbi = (struct tdb_ident *)(mtag + 1);
894: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
895: } else {
896: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 897: IP_FORWARDING, &error);
1.173 jonathan 898: }
899: if (sp != NULL) {
900: /*
901: * Check security policy against packet attributes.
902: */
903: error = ipsec_in_reject(sp, m);
904: KEY_FREESP(&sp);
905: } else {
906: /* XXX error stat??? */
907: error = EINVAL;
908: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
909: }
910: splx(s);
911: if (error)
912: goto bad;
913: }
914: #endif /* FAST_IPSEC */
1.1 cgd 915:
916: /*
917: * Switch out to protocol's input routine.
918: */
1.82 aidan 919: #if IFA_STATS
1.122 itojun 920: if (ia && ip)
1.155 itojun 921: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 922: #endif
1.266 thorpej 923: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 924: {
925: int off = hlen, nh = ip->ip_p;
926:
927: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
928: return;
929: }
1.1 cgd 930: bad:
931: m_freem(m);
1.135 thorpej 932: return;
933:
934: badcsum:
1.266 thorpej 935: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 936: m_freem(m);
1.1 cgd 937: }
938:
939: /*
1.288 rmind 940: * IP timer processing.
1.1 cgd 941: */
1.8 mycroft 942: void
1.211 perry 943: ip_slowtimo(void)
1.1 cgd 944: {
1.268 ad 945:
946: mutex_enter(softnet_lock);
947: KERNEL_LOCK(1, NULL);
1.1 cgd 948:
1.288 rmind 949: ip_reass_slowtimo();
1.268 ad 950:
951: KERNEL_UNLOCK_ONE(NULL);
952: mutex_exit(softnet_lock);
1.1 cgd 953: }
954:
955: /*
1.288 rmind 956: * IP drain processing.
1.1 cgd 957: */
1.8 mycroft 958: void
1.211 perry 959: ip_drain(void)
1.1 cgd 960: {
961:
1.268 ad 962: KERNEL_LOCK(1, NULL);
1.288 rmind 963: ip_reass_drain();
1.268 ad 964: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 965: }
966:
967: /*
968: * Do option processing on a datagram,
969: * possibly discarding it if bad options are encountered,
970: * or forwarding it if source-routed.
971: * Returns 1 if packet has been forwarded/freed,
972: * 0 if the packet should be processed further.
973: */
1.8 mycroft 974: int
1.211 perry 975: ip_dooptions(struct mbuf *m)
1.1 cgd 976: {
1.109 augustss 977: struct ip *ip = mtod(m, struct ip *);
978: u_char *cp, *cp0;
979: struct ip_timestamp *ipt;
980: struct in_ifaddr *ia;
1.1 cgd 981: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 982: struct in_addr dst;
1.1 cgd 983: n_time ntime;
984:
1.13 mycroft 985: dst = ip->ip_dst;
1.1 cgd 986: cp = (u_char *)(ip + 1);
987: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
988: for (; cnt > 0; cnt -= optlen, cp += optlen) {
989: opt = cp[IPOPT_OPTVAL];
990: if (opt == IPOPT_EOL)
991: break;
992: if (opt == IPOPT_NOP)
993: optlen = 1;
994: else {
1.113 itojun 995: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
996: code = &cp[IPOPT_OLEN] - (u_char *)ip;
997: goto bad;
998: }
1.1 cgd 999: optlen = cp[IPOPT_OLEN];
1.114 itojun 1000: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1001: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1002: goto bad;
1003: }
1004: }
1005: switch (opt) {
1006:
1007: default:
1008: break;
1009:
1010: /*
1011: * Source routing with record.
1012: * Find interface with current destination address.
1013: * If none on this machine then drop if strictly routed,
1014: * or do nothing if loosely routed.
1015: * Record interface address and bring up next address
1016: * component. If strictly routed make sure next
1017: * address is on directly accessible net.
1018: */
1019: case IPOPT_LSRR:
1020: case IPOPT_SSRR:
1.47 cjs 1021: if (ip_allowsrcrt == 0) {
1022: type = ICMP_UNREACH;
1023: code = ICMP_UNREACH_NET_PROHIB;
1024: goto bad;
1025: }
1.114 itojun 1026: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1027: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1028: goto bad;
1029: }
1.1 cgd 1030: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1031: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1032: goto bad;
1033: }
1034: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1035: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1036: if (ia == 0) {
1037: if (opt == IPOPT_SSRR) {
1038: type = ICMP_UNREACH;
1039: code = ICMP_UNREACH_SRCFAIL;
1040: goto bad;
1041: }
1042: /*
1043: * Loose routing, and not at next destination
1044: * yet; nothing to do except forward.
1045: */
1046: break;
1047: }
1048: off--; /* 0 origin */
1.112 sommerfe 1049: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1050: /*
1051: * End of source route. Should be for us.
1052: */
1053: save_rte(cp, ip->ip_src);
1054: break;
1055: }
1056: /*
1057: * locate outgoing interface
1058: */
1.281 tsutsui 1059: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 1060: sizeof(ipaddr.sin_addr));
1.96 thorpej 1061: if (opt == IPOPT_SSRR)
1.196 itojun 1062: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1063: else
1.1 cgd 1064: ia = ip_rtaddr(ipaddr.sin_addr);
1065: if (ia == 0) {
1066: type = ICMP_UNREACH;
1067: code = ICMP_UNREACH_SRCFAIL;
1068: goto bad;
1069: }
1070: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1071: bcopy((void *)&ia->ia_addr.sin_addr,
1072: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1073: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1074: /*
1075: * Let ip_intr's mcast routing check handle mcast pkts
1076: */
1.18 mycroft 1077: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1078: break;
1079:
1080: case IPOPT_RR:
1.114 itojun 1081: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1082: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1083: goto bad;
1084: }
1.1 cgd 1085: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1086: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1087: goto bad;
1088: }
1089: /*
1090: * If no space remains, ignore.
1091: */
1092: off--; /* 0 origin */
1.112 sommerfe 1093: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1094: break;
1.281 tsutsui 1095: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1096: sizeof(ipaddr.sin_addr));
1097: /*
1098: * locate outgoing interface; if we're the destination,
1099: * use the incoming interface (should be same).
1100: */
1.96 thorpej 1101: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1102: == NULL &&
1103: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1104: type = ICMP_UNREACH;
1105: code = ICMP_UNREACH_HOST;
1106: goto bad;
1107: }
1.244 christos 1108: bcopy((void *)&ia->ia_addr.sin_addr,
1109: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1110: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1111: break;
1112:
1113: case IPOPT_TS:
1114: code = cp - (u_char *)ip;
1115: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1116: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1117: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1118: goto bad;
1.114 itojun 1119: }
1120: if (ipt->ipt_ptr < 5) {
1121: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1122: goto bad;
1123: }
1.15 cgd 1124: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1125: if (++ipt->ipt_oflw == 0) {
1126: code = (u_char *)&ipt->ipt_ptr -
1127: (u_char *)ip;
1.1 cgd 1128: goto bad;
1.114 itojun 1129: }
1.1 cgd 1130: break;
1131: }
1.104 thorpej 1132: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1133: switch (ipt->ipt_flg) {
1134:
1135: case IPOPT_TS_TSONLY:
1136: break;
1137:
1138: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1139: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1140: sizeof(struct in_addr) > ipt->ipt_len) {
1141: code = (u_char *)&ipt->ipt_ptr -
1142: (u_char *)ip;
1.1 cgd 1143: goto bad;
1.114 itojun 1144: }
1.13 mycroft 1145: ipaddr.sin_addr = dst;
1.96 thorpej 1146: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1147: m->m_pkthdr.rcvif));
1.13 mycroft 1148: if (ia == 0)
1149: continue;
1.104 thorpej 1150: bcopy(&ia->ia_addr.sin_addr,
1151: cp0, sizeof(struct in_addr));
1.1 cgd 1152: ipt->ipt_ptr += sizeof(struct in_addr);
1153: break;
1154:
1155: case IPOPT_TS_PRESPEC:
1.66 thorpej 1156: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1157: sizeof(struct in_addr) > ipt->ipt_len) {
1158: code = (u_char *)&ipt->ipt_ptr -
1159: (u_char *)ip;
1.1 cgd 1160: goto bad;
1.114 itojun 1161: }
1.281 tsutsui 1162: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1163: sizeof(struct in_addr));
1.96 thorpej 1164: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1165: == NULL)
1.1 cgd 1166: continue;
1167: ipt->ipt_ptr += sizeof(struct in_addr);
1168: break;
1169:
1170: default:
1.114 itojun 1171: /* XXX can't take &ipt->ipt_flg */
1172: code = (u_char *)&ipt->ipt_ptr -
1173: (u_char *)ip + 1;
1.1 cgd 1174: goto bad;
1175: }
1176: ntime = iptime();
1.107 thorpej 1177: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1178: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1179: sizeof(n_time));
1180: ipt->ipt_ptr += sizeof(n_time);
1181: }
1182: }
1183: if (forward) {
1.26 thorpej 1184: if (ip_forwsrcrt == 0) {
1185: type = ICMP_UNREACH;
1186: code = ICMP_UNREACH_SRCFAIL;
1187: goto bad;
1188: }
1.1 cgd 1189: ip_forward(m, 1);
1190: return (1);
1.13 mycroft 1191: }
1192: return (0);
1.1 cgd 1193: bad:
1.13 mycroft 1194: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1195: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1196: return (1);
1197: }
1198:
1199: /*
1200: * Given address of next destination (final or next hop),
1201: * return internet address info of interface to be used to get there.
1202: */
1203: struct in_ifaddr *
1.211 perry 1204: ip_rtaddr(struct in_addr dst)
1.1 cgd 1205: {
1.249 dyoung 1206: struct rtentry *rt;
1207: union {
1208: struct sockaddr dst;
1209: struct sockaddr_in dst4;
1210: } u;
1211:
1212: sockaddr_in_init(&u.dst4, &dst, 0);
1213:
1214: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1215: return NULL;
1216:
1217: return ifatoia(rt->rt_ifa);
1.1 cgd 1218: }
1219:
1220: /*
1221: * Save incoming source route for use in replies,
1222: * to be picked up later by ip_srcroute if the receiver is interested.
1223: */
1.13 mycroft 1224: void
1.211 perry 1225: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1226: {
1227: unsigned olen;
1228:
1229: olen = option[IPOPT_OLEN];
1230: #ifdef DIAGNOSTIC
1231: if (ipprintfs)
1.39 christos 1232: printf("save_rte: olen %d\n", olen);
1.89 itojun 1233: #endif /* 0 */
1.1 cgd 1234: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1235: return;
1.281 tsutsui 1236: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1237: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1238: ip_srcrt.dst = dst;
1239: }
1240:
1241: /*
1242: * Retrieve incoming source route for use in replies,
1243: * in the same form used by setsockopt.
1244: * The first hop is placed before the options, will be removed later.
1245: */
1246: struct mbuf *
1.211 perry 1247: ip_srcroute(void)
1.1 cgd 1248: {
1.109 augustss 1249: struct in_addr *p, *q;
1250: struct mbuf *m;
1.1 cgd 1251:
1252: if (ip_nhops == 0)
1.237 dyoung 1253: return NULL;
1.1 cgd 1254: m = m_get(M_DONTWAIT, MT_SOOPTS);
1255: if (m == 0)
1.237 dyoung 1256: return NULL;
1.1 cgd 1257:
1.164 matt 1258: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1259: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1260:
1261: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1262: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1263: OPTSIZ;
1264: #ifdef DIAGNOSTIC
1265: if (ipprintfs)
1.39 christos 1266: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1267: #endif
1268:
1269: /*
1270: * First save first hop for return route
1271: */
1272: p = &ip_srcrt.route[ip_nhops - 1];
1273: *(mtod(m, struct in_addr *)) = *p--;
1274: #ifdef DIAGNOSTIC
1275: if (ipprintfs)
1.39 christos 1276: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1277: #endif
1278:
1279: /*
1280: * Copy option fields and padding (nop) to mbuf.
1281: */
1282: ip_srcrt.nop = IPOPT_NOP;
1283: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1284: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1285: OPTSIZ);
1286: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1287: sizeof(struct in_addr) + OPTSIZ);
1288: #undef OPTSIZ
1289: /*
1290: * Record return path as an IP source route,
1291: * reversing the path (pointers are now aligned).
1292: */
1293: while (p >= ip_srcrt.route) {
1294: #ifdef DIAGNOSTIC
1295: if (ipprintfs)
1.39 christos 1296: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1297: #endif
1298: *q++ = *p--;
1299: }
1300: /*
1301: * Last hop goes to final destination.
1302: */
1303: *q = ip_srcrt.dst;
1304: #ifdef DIAGNOSTIC
1305: if (ipprintfs)
1.39 christos 1306: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1307: #endif
1308: return (m);
1309: }
1310:
1.139 matt 1311: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1312: [PRC_MSGSIZE] = EMSGSIZE,
1313: [PRC_HOSTDEAD] = EHOSTDOWN,
1314: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1315: [PRC_UNREACH_NET] = EHOSTUNREACH,
1316: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1317: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1318: [PRC_UNREACH_PORT] = ECONNREFUSED,
1319: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1320: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1321: };
1322:
1323: /*
1324: * Forward a packet. If some error occurs return the sender
1325: * an icmp packet. Note we can't always generate a meaningful
1326: * icmp message because icmp doesn't have a large enough repertoire
1327: * of codes and types.
1328: *
1329: * If not forwarding, just drop the packet. This could be confusing
1330: * if ipforwarding was zero but some routing protocol was advancing
1331: * us as a gateway to somewhere. However, we must let the routing
1332: * protocol deal with that.
1333: *
1334: * The srcrt parameter indicates whether the packet is being forwarded
1335: * via a source route.
1336: */
1.13 mycroft 1337: void
1.211 perry 1338: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1339: {
1.109 augustss 1340: struct ip *ip = mtod(m, struct ip *);
1341: struct rtentry *rt;
1.220 christos 1342: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1343: struct mbuf *mcopy;
1.13 mycroft 1344: n_long dest;
1.249 dyoung 1345: union {
1346: struct sockaddr dst;
1347: struct sockaddr_in dst4;
1348: } u;
1.164 matt 1349:
1350: /*
1351: * We are now in the output path.
1352: */
1353: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1354:
1355: /*
1356: * Clear any in-bound checksum flags for this packet.
1357: */
1358: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1359:
1.13 mycroft 1360: dest = 0;
1.1 cgd 1361: #ifdef DIAGNOSTIC
1.224 joerg 1362: if (ipprintfs) {
1363: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1364: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1365: }
1.1 cgd 1366: #endif
1.93 sommerfe 1367: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1368: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1369: m_freem(m);
1370: return;
1371: }
1372: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1373: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1374: return;
1375: }
1376:
1.249 dyoung 1377: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1378: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1379: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1380: return;
1.1 cgd 1381: }
1382:
1383: /*
1.34 mycroft 1384: * Save at most 68 bytes of the packet in case
1.1 cgd 1385: * we need to generate an ICMP message to the src.
1.119 itojun 1386: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1387: */
1.155 itojun 1388: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1389: if (mcopy)
1390: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1391:
1.221 christos 1392: ip->ip_ttl -= IPTTLDEC;
1393:
1.1 cgd 1394: /*
1395: * If forwarding packet using same interface that it came in on,
1396: * perhaps should send a redirect to sender to shortcut a hop.
1397: * Only send redirect if source is sending directly to us,
1398: * and if packet was not source routed (or has any options).
1399: * Also, don't send redirect if forwarding using a default route
1400: * or a route modified by a redirect.
1401: */
1402: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1403: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1404: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1405: ipsendredirects && !srcrt) {
1.19 mycroft 1406: if (rt->rt_ifa &&
1407: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1408: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1409: if (rt->rt_flags & RTF_GATEWAY)
1410: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1411: else
1412: dest = ip->ip_dst.s_addr;
1413: /*
1414: * Router requirements says to only send host
1415: * redirects.
1416: */
1417: type = ICMP_REDIRECT;
1418: code = ICMP_REDIRECT_HOST;
1.1 cgd 1419: #ifdef DIAGNOSTIC
1.77 thorpej 1420: if (ipprintfs)
1421: printf("redirect (%d) to %x\n", code,
1422: (u_int32_t)dest);
1.1 cgd 1423: #endif
1424: }
1425: }
1426:
1.238 dyoung 1427: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1428: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1429: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1430:
1.1 cgd 1431: if (error)
1.266 thorpej 1432: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1433: else {
1.266 thorpej 1434: uint64_t *ips = IP_STAT_GETREF();
1435: ips[IP_STAT_FORWARD]++;
1436: if (type) {
1437: ips[IP_STAT_REDIRECTSENT]++;
1438: IP_STAT_PUTREF();
1439: } else {
1440: IP_STAT_PUTREF();
1.63 matt 1441: if (mcopy) {
1442: #ifdef GATEWAY
1.64 thorpej 1443: if (mcopy->m_flags & M_CANFASTFWD)
1444: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1445: #endif
1.1 cgd 1446: m_freem(mcopy);
1.63 matt 1447: }
1.1 cgd 1448: return;
1449: }
1450: }
1451: if (mcopy == NULL)
1452: return;
1.13 mycroft 1453:
1.1 cgd 1454: switch (error) {
1455:
1456: case 0: /* forwarded, but need redirect */
1457: /* type, code set above */
1458: break;
1459:
1460: case ENETUNREACH: /* shouldn't happen, checked above */
1461: case EHOSTUNREACH:
1462: case ENETDOWN:
1463: case EHOSTDOWN:
1464: default:
1465: type = ICMP_UNREACH;
1466: code = ICMP_UNREACH_HOST;
1467: break;
1468:
1469: case EMSGSIZE:
1470: type = ICMP_UNREACH;
1471: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1472:
1.274 seanb 1473: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1474: destmtu = rt->rt_ifp->if_mtu;
1.263 cube 1475:
1476: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274 seanb 1477: {
1.263 cube 1478: /*
1479: * If the packet is routed over IPsec tunnel, tell the
1480: * originator the tunnel MTU.
1481: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1482: * XXX quickhack!!!
1483: */
1484:
1.89 itojun 1485: struct secpolicy *sp;
1486: int ipsecerror;
1.95 itojun 1487: size_t ipsechdr;
1.89 itojun 1488: struct route *ro;
1489:
1490: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1491: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1492: &ipsecerror);
1.89 itojun 1493:
1.263 cube 1494: if (sp != NULL) {
1.89 itojun 1495: /* count IPsec header size */
1.95 itojun 1496: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1497: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1498:
1499: /*
1500: * find the correct route for outer IPv4
1501: * header, compute tunnel MTU.
1502: */
1.220 christos 1503:
1.89 itojun 1504: if (sp->req != NULL
1.95 itojun 1505: && sp->req->sav != NULL
1506: && sp->req->sav->sah != NULL) {
1507: ro = &sp->req->sav->sah->sa_route;
1.274 seanb 1508: rt = rtcache_validate(ro);
1.257 dyoung 1509: if (rt && rt->rt_ifp) {
1.220 christos 1510: destmtu =
1.257 dyoung 1511: rt->rt_rmx.rmx_mtu ?
1512: rt->rt_rmx.rmx_mtu :
1513: rt->rt_ifp->if_mtu;
1.220 christos 1514: destmtu -= ipsechdr;
1.89 itojun 1515: }
1516: }
1517:
1.173 jonathan 1518: #ifdef IPSEC
1.89 itojun 1519: key_freesp(sp);
1.173 jonathan 1520: #else
1521: KEY_FREESP(&sp);
1522: #endif
1.89 itojun 1523: }
1.274 seanb 1524: }
1.263 cube 1525: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266 thorpej 1526: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1527: break;
1528:
1529: case ENOBUFS:
1.143 itojun 1530: #if 1
1531: /*
1532: * a router should not generate ICMP_SOURCEQUENCH as
1533: * required in RFC1812 Requirements for IP Version 4 Routers.
1534: * source quench could be a big problem under DoS attacks,
1.149 wiz 1535: * or if the underlying interface is rate-limited.
1.143 itojun 1536: */
1537: if (mcopy)
1538: m_freem(mcopy);
1539: return;
1540: #else
1.1 cgd 1541: type = ICMP_SOURCEQUENCH;
1542: code = 0;
1543: break;
1.143 itojun 1544: #endif
1.1 cgd 1545: }
1.220 christos 1546: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 1547: }
1548:
1549: void
1.211 perry 1550: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1551: struct mbuf *m)
1.44 thorpej 1552: {
1553:
1.283 minskim 1554: if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278 christos 1555: #ifdef SO_OTIMESTAMP
1.283 minskim 1556: || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278 christos 1557: #endif
1558: ) {
1.44 thorpej 1559: struct timeval tv;
1560:
1561: microtime(&tv);
1.278 christos 1562: #ifdef SO_OTIMESTAMP
1563: if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
1564: struct timeval50 tv50;
1565: timeval_to_timeval50(&tv, &tv50);
1566: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1567: SCM_OTIMESTAMP, SOL_SOCKET);
1568: } else
1569: #endif
1.244 christos 1570: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1571: SCM_TIMESTAMP, SOL_SOCKET);
1572: if (*mp)
1573: mp = &(*mp)->m_next;
1574: }
1575: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 1576: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1577: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1578: if (*mp)
1579: mp = &(*mp)->m_next;
1580: }
1581: #ifdef notyet
1582: /*
1583: * XXX
1584: * Moving these out of udp_input() made them even more broken
1585: * than they already were.
1586: * - fenner@parc.xerox.com
1587: */
1588: /* options were tossed already */
1589: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 1590: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 1591: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1592: if (*mp)
1593: mp = &(*mp)->m_next;
1594: }
1595: /* ip_srcroute doesn't do what we want here, need to fix */
1596: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 1597: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 1598: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1599: if (*mp)
1600: mp = &(*mp)->m_next;
1601: }
1602: #endif
1603: if (inp->inp_flags & INP_RECVIF) {
1604: struct sockaddr_dl sdl;
1605:
1.252 dyoung 1606: sockaddr_dl_init(&sdl, sizeof(sdl),
1607: (m->m_pkthdr.rcvif != NULL)
1608: ? m->m_pkthdr.rcvif->if_index
1609: : 0,
1610: 0, NULL, 0, NULL, 0);
1.251 dyoung 1611: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1612: if (*mp)
1613: mp = &(*mp)->m_next;
1614: }
1.282 minskim 1615: if (inp->inp_flags & INP_RECVTTL) {
1616: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1617: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1618: if (*mp)
1619: mp = &(*mp)->m_next;
1620: }
1.13 mycroft 1621: }
1622:
1.189 atatat 1623: /*
1.228 elad 1624: * sysctl helper routine for net.inet.ip.forwsrcrt.
1625: */
1626: static int
1627: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1628: {
1629: int error, tmp;
1630: struct sysctlnode node;
1631:
1632: node = *rnode;
1633: tmp = ip_forwsrcrt;
1634: node.sysctl_data = &tmp;
1635: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1636: if (error || newp == NULL)
1637: return (error);
1638:
1.280 elad 1639: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1640: 0, NULL, NULL, NULL);
1641: if (error)
1642: return (error);
1.228 elad 1643:
1644: ip_forwsrcrt = tmp;
1645:
1646: return (0);
1647: }
1648:
1649: /*
1.189 atatat 1650: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1651: * range of the new value and tweaks timers if it changes.
1652: */
1653: static int
1654: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1655: {
1.189 atatat 1656: int error, tmp;
1657: struct sysctlnode node;
1658:
1659: node = *rnode;
1660: tmp = ip_mtudisc_timeout;
1661: node.sysctl_data = &tmp;
1662: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1663: if (error || newp == NULL)
1664: return (error);
1665: if (tmp < 0)
1666: return (EINVAL);
1.52 thorpej 1667:
1.273 matt 1668: mutex_enter(softnet_lock);
1669:
1.189 atatat 1670: ip_mtudisc_timeout = tmp;
1671: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1672:
1.273 matt 1673: mutex_exit(softnet_lock);
1674:
1.189 atatat 1675: return (0);
1676: }
1.54 lukem 1677:
1.65 matt 1678: #ifdef GATEWAY
1.189 atatat 1679: /*
1.247 liamjfoy 1680: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 1681: */
1682: static int
1683: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
1684: {
1.273 matt 1685: int error;
1.67 thorpej 1686:
1.273 matt 1687: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1688: if (error || newp == NULL)
1689: return (error);
1690:
1691: mutex_enter(softnet_lock);
1692: KERNEL_LOCK(1, NULL);
1.212 perry 1693:
1.265 thorpej 1694: ipflow_prune();
1.273 matt 1695:
1696: KERNEL_UNLOCK_ONE(NULL);
1697: mutex_exit(softnet_lock);
1.144 martin 1698:
1.189 atatat 1699: return (0);
1700: }
1.248 liamjfoy 1701:
1702: static int
1703: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283 minskim 1704: {
1.248 liamjfoy 1705: int error, tmp;
1706: struct sysctlnode node;
1707:
1708: node = *rnode;
1709: tmp = ip_hashsize;
1710: node.sysctl_data = &tmp;
1711: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1712: if (error || newp == NULL)
1713: return (error);
1714:
1715: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1716: /*
1717: * Can only fail due to malloc()
1718: */
1.273 matt 1719: mutex_enter(softnet_lock);
1720: KERNEL_LOCK(1, NULL);
1721:
1722: error = ipflow_invalidate_all(tmp);
1723:
1724: KERNEL_UNLOCK_ONE(NULL);
1725: mutex_exit(softnet_lock);
1726:
1.248 liamjfoy 1727: } else {
1728: /*
1729: * EINVAL if not a power of 2
1730: */
1.273 matt 1731: error = EINVAL;
1.283 minskim 1732: }
1.248 liamjfoy 1733:
1.273 matt 1734: return error;
1.248 liamjfoy 1735: }
1.189 atatat 1736: #endif /* GATEWAY */
1.117 tron 1737:
1.266 thorpej 1738: static int
1739: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1740: {
1741:
1.271 thorpej 1742: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1743: }
1.131 itojun 1744:
1.284 pooka 1745: static void
1746: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1747: {
1748: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 1749:
1.197 atatat 1750: sysctl_createv(clog, 0, NULL, NULL,
1751: CTLFLAG_PERMANENT,
1.189 atatat 1752: CTLTYPE_NODE, "net", NULL,
1753: NULL, 0, NULL, 0,
1754: CTL_NET, CTL_EOL);
1.197 atatat 1755: sysctl_createv(clog, 0, NULL, NULL,
1756: CTLFLAG_PERMANENT,
1.203 atatat 1757: CTLTYPE_NODE, "inet",
1758: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1759: NULL, 0, NULL, 0,
1760: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1761: sysctl_createv(clog, 0, NULL, NULL,
1762: CTLFLAG_PERMANENT,
1.203 atatat 1763: CTLTYPE_NODE, "ip",
1764: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1765: NULL, 0, NULL, 0,
1766: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1767:
1.197 atatat 1768: sysctl_createv(clog, 0, NULL, NULL,
1769: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1770: CTLTYPE_INT, "forwarding",
1771: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1772: NULL, 0, &ipforwarding, 0,
1773: CTL_NET, PF_INET, IPPROTO_IP,
1774: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1775: sysctl_createv(clog, 0, NULL, NULL,
1776: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1777: CTLTYPE_INT, "redirect",
1778: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1779: NULL, 0, &ipsendredirects, 0,
1780: CTL_NET, PF_INET, IPPROTO_IP,
1781: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1782: sysctl_createv(clog, 0, NULL, NULL,
1783: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1784: CTLTYPE_INT, "ttl",
1785: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1786: NULL, 0, &ip_defttl, 0,
1787: CTL_NET, PF_INET, IPPROTO_IP,
1788: IPCTL_DEFTTL, CTL_EOL);
1789: #ifdef IPCTL_DEFMTU
1.197 atatat 1790: sysctl_createv(clog, 0, NULL, NULL,
1791: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1792: CTLTYPE_INT, "mtu",
1793: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1794: NULL, 0, &ip_mtu, 0,
1795: CTL_NET, PF_INET, IPPROTO_IP,
1796: IPCTL_DEFMTU, CTL_EOL);
1797: #endif /* IPCTL_DEFMTU */
1.197 atatat 1798: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1799: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1800: CTLTYPE_INT, "forwsrcrt",
1801: SYSCTL_DESCR("Enable forwarding of source-routed "
1802: "datagrams"),
1.228 elad 1803: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1804: CTL_NET, PF_INET, IPPROTO_IP,
1805: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1806: sysctl_createv(clog, 0, NULL, NULL,
1807: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1808: CTLTYPE_INT, "directed-broadcast",
1809: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1810: NULL, 0, &ip_directedbcast, 0,
1811: CTL_NET, PF_INET, IPPROTO_IP,
1812: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1813: sysctl_createv(clog, 0, NULL, NULL,
1814: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1815: CTLTYPE_INT, "allowsrcrt",
1816: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1817: NULL, 0, &ip_allowsrcrt, 0,
1818: CTL_NET, PF_INET, IPPROTO_IP,
1819: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 1820: sysctl_createv(clog, 0, NULL, NULL,
1821: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1822: CTLTYPE_INT, "subnetsarelocal",
1823: SYSCTL_DESCR("Whether logical subnets are considered "
1824: "local"),
1.189 atatat 1825: NULL, 0, &subnetsarelocal, 0,
1826: CTL_NET, PF_INET, IPPROTO_IP,
1827: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 1828: sysctl_createv(clog, 0, NULL, NULL,
1829: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1830: CTLTYPE_INT, "mtudisc",
1831: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1832: NULL, 0, &ip_mtudisc, 0,
1833: CTL_NET, PF_INET, IPPROTO_IP,
1834: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1835: sysctl_createv(clog, 0, NULL, NULL,
1836: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1837: CTLTYPE_INT, "anonportmin",
1838: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1839: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1840: CTL_NET, PF_INET, IPPROTO_IP,
1841: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1842: sysctl_createv(clog, 0, NULL, NULL,
1843: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1844: CTLTYPE_INT, "anonportmax",
1845: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1846: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1847: CTL_NET, PF_INET, IPPROTO_IP,
1848: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1849: sysctl_createv(clog, 0, NULL, NULL,
1850: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1851: CTLTYPE_INT, "mtudisctimeout",
1852: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 1853: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
1854: CTL_NET, PF_INET, IPPROTO_IP,
1855: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1856: #ifdef GATEWAY
1.197 atatat 1857: sysctl_createv(clog, 0, NULL, NULL,
1858: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1859: CTLTYPE_INT, "maxflows",
1860: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 1861: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
1862: CTL_NET, PF_INET, IPPROTO_IP,
1863: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 1864: sysctl_createv(clog, 0, NULL, NULL,
1865: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1866: CTLTYPE_INT, "hashsize",
1867: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
1868: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
1869: CTL_NET, PF_INET, IPPROTO_IP,
1870: CTL_CREATE, CTL_EOL);
1.189 atatat 1871: #endif /* GATEWAY */
1.197 atatat 1872: sysctl_createv(clog, 0, NULL, NULL,
1873: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1874: CTLTYPE_INT, "hostzerobroadcast",
1875: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 1876: NULL, 0, &hostzeroisbroadcast, 0,
1877: CTL_NET, PF_INET, IPPROTO_IP,
1878: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
1879: #if NGIF > 0
1.197 atatat 1880: sysctl_createv(clog, 0, NULL, NULL,
1881: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1882: CTLTYPE_INT, "gifttl",
1883: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 1884: NULL, 0, &ip_gif_ttl, 0,
1885: CTL_NET, PF_INET, IPPROTO_IP,
1886: IPCTL_GIF_TTL, CTL_EOL);
1887: #endif /* NGIF */
1888: #ifndef IPNOPRIVPORTS
1.197 atatat 1889: sysctl_createv(clog, 0, NULL, NULL,
1890: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1891: CTLTYPE_INT, "lowportmin",
1892: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1893: "to assign"),
1.189 atatat 1894: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1895: CTL_NET, PF_INET, IPPROTO_IP,
1896: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1897: sysctl_createv(clog, 0, NULL, NULL,
1898: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1899: CTLTYPE_INT, "lowportmax",
1900: SYSCTL_DESCR("Highest privileged ephemeral port number "
1901: "to assign"),
1.189 atatat 1902: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1903: CTL_NET, PF_INET, IPPROTO_IP,
1904: IPCTL_LOWPORTMAX, CTL_EOL);
1905: #endif /* IPNOPRIVPORTS */
1906: #if NGRE > 0
1.197 atatat 1907: sysctl_createv(clog, 0, NULL, NULL,
1908: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1909: CTLTYPE_INT, "grettl",
1910: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1911: NULL, 0, &ip_gre_ttl, 0,
1912: CTL_NET, PF_INET, IPPROTO_IP,
1913: IPCTL_GRE_TTL, CTL_EOL);
1914: #endif /* NGRE */
1.197 atatat 1915: sysctl_createv(clog, 0, NULL, NULL,
1916: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1917: CTLTYPE_INT, "checkinterface",
1918: SYSCTL_DESCR("Enable receive side of Strong ES model "
1919: "from RFC1122"),
1.189 atatat 1920: NULL, 0, &ip_checkinterface, 0,
1921: CTL_NET, PF_INET, IPPROTO_IP,
1922: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1923: sysctl_createv(clog, 0, NULL, NULL,
1924: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1925: CTLTYPE_INT, "random_id",
1926: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1927: NULL, 0, &ip_do_randomid, 0,
1928: CTL_NET, PF_INET, IPPROTO_IP,
1929: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1930: sysctl_createv(clog, 0, NULL, NULL,
1931: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1932: CTLTYPE_INT, "do_loopback_cksum",
1933: SYSCTL_DESCR("Perform IP checksum on loopback"),
1934: NULL, 0, &ip_do_loopback_cksum, 0,
1935: CTL_NET, PF_INET, IPPROTO_IP,
1936: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1937: sysctl_createv(clog, 0, NULL, NULL,
1938: CTLFLAG_PERMANENT,
1939: CTLTYPE_STRUCT, "stats",
1940: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1941: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1942: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1943: CTL_EOL);
1.1 cgd 1944: }
1.266 thorpej 1945:
1946: void
1947: ip_statinc(u_int stat)
1948: {
1949:
1950: KASSERT(stat < IP_NSTATS);
1951: IP_STATINC(stat);
1952: }
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