Annotation of src/sys/netinet/ip_input.c, Revision 1.296.2.4
1.296.2.4! yamt 1: /* $NetBSD: ip_input.c,v 1.296.2.3 2013/01/16 05:33:49 yamt 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>
1.296.2.4! yamt 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.296.2.3 2013/01/16 05:33:49 yamt 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"
1.91 thorpej 99: #include "opt_ipsec.h"
1.55 scottr 100: #include "opt_mrouting.h"
1.167 martin 101: #include "opt_mbuftrace.h"
1.135 thorpej 102: #include "opt_inet_csum.h"
1.1 cgd 103:
1.5 mycroft 104: #include <sys/param.h>
105: #include <sys/systm.h>
106: #include <sys/mbuf.h>
107: #include <sys/domain.h>
108: #include <sys/protosw.h>
109: #include <sys/socket.h>
1.44 thorpej 110: #include <sys/socketvar.h>
1.5 mycroft 111: #include <sys/errno.h>
112: #include <sys/time.h>
113: #include <sys/kernel.h>
1.72 thorpej 114: #include <sys/pool.h>
1.28 christos 115: #include <sys/sysctl.h>
1.230 elad 116: #include <sys/kauth.h>
1.1 cgd 117:
1.5 mycroft 118: #include <net/if.h>
1.44 thorpej 119: #include <net/if_dl.h>
1.5 mycroft 120: #include <net/route.h>
1.45 mrg 121: #include <net/pfil.h>
1.1 cgd 122:
1.5 mycroft 123: #include <netinet/in.h>
124: #include <netinet/in_systm.h>
125: #include <netinet/ip.h>
126: #include <netinet/in_pcb.h>
1.215 yamt 127: #include <netinet/in_proto.h>
1.5 mycroft 128: #include <netinet/in_var.h>
129: #include <netinet/ip_var.h>
1.266 thorpej 130: #include <netinet/ip_private.h>
1.5 mycroft 131: #include <netinet/ip_icmp.h>
1.89 itojun 132: /* just for gif_ttl */
133: #include <netinet/in_gif.h>
134: #include "gif.h"
1.144 martin 135: #include <net/if_gre.h>
136: #include "gre.h"
1.111 jdolecek 137:
138: #ifdef MROUTING
139: #include <netinet/ip_mroute.h>
140: #endif
1.296.2.2 yamt 141: #include <netinet/portalgo.h>
1.89 itojun 142:
1.296.2.4! yamt 143: #ifdef IPSEC
1.173 jonathan 144: #include <netipsec/ipsec.h>
1.296.2.4! yamt 145: #endif
1.44 thorpej 146:
1.1 cgd 147: #ifndef IPFORWARDING
148: #ifdef GATEWAY
149: #define IPFORWARDING 1 /* forward IP packets not for us */
150: #else /* GATEWAY */
151: #define IPFORWARDING 0 /* don't forward IP packets not for us */
152: #endif /* GATEWAY */
153: #endif /* IPFORWARDING */
154: #ifndef IPSENDREDIRECTS
155: #define IPSENDREDIRECTS 1
156: #endif
1.26 thorpej 157: #ifndef IPFORWSRCRT
1.47 cjs 158: #define IPFORWSRCRT 1 /* forward source-routed packets */
159: #endif
160: #ifndef IPALLOWSRCRT
1.48 mrg 161: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 162: #endif
1.53 kml 163: #ifndef IPMTUDISC
1.153 itojun 164: #define IPMTUDISC 1
1.53 kml 165: #endif
1.60 kml 166: #ifndef IPMTUDISCTIMEOUT
1.61 kml 167: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 168: #endif
1.53 kml 169:
1.278 christos 170: #ifdef COMPAT_50
171: #include <compat/sys/time.h>
172: #include <compat/sys/socket.h>
173: #endif
174:
1.27 thorpej 175: /*
176: * Note: DIRECTED_BROADCAST is handled this way so that previous
177: * configuration using this option will Just Work.
178: */
179: #ifndef IPDIRECTEDBCAST
180: #ifdef DIRECTED_BROADCAST
181: #define IPDIRECTEDBCAST 1
182: #else
183: #define IPDIRECTEDBCAST 0
184: #endif /* DIRECTED_BROADCAST */
185: #endif /* IPDIRECTEDBCAST */
1.1 cgd 186: int ipforwarding = IPFORWARDING;
187: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 188: int ip_defttl = IPDEFTTL;
1.26 thorpej 189: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 190: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 191: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 192: int ip_mtudisc = IPMTUDISC;
1.156 itojun 193: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
1.184 jonathan 197:
198: int ip_do_randomid = 0;
199:
1.165 christos 200: /*
201: * XXX - Setting ip_checkinterface mostly implements the receive side of
202: * the Strong ES model described in RFC 1122, but since the routing table
203: * and transmit implementation do not implement the Strong ES model,
204: * setting this to 1 results in an odd hybrid.
205: *
206: * XXX - ip_checkinterface currently must be disabled if you use ipnat
207: * to translate the destination address to another local interface.
208: *
209: * XXX - ip_checkinterface must be disabled if you add IP aliases
210: * to the loopback interface instead of the interface where the
211: * packets for those addresses are received.
212: */
213: int ip_checkinterface = 0;
214:
1.1 cgd 215:
1.60 kml 216: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
217:
1.150 matt 218: u_long in_ifaddrhash; /* size of hash table - 1 */
219: int in_ifaddrentries; /* total number of addrs */
1.212 perry 220: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 221: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 222: u_long in_multihash; /* size of hash table - 1 */
223: int in_multientries; /* total number of addrs */
224: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 225: struct ifqueue ipintrq;
1.286 tls 226:
1.291 rmind 227: ipid_state_t * ip_ids;
1.183 jonathan 228: uint16_t ip_id;
1.75 thorpej 229:
1.266 thorpej 230: percpu_t *ipstat_percpu;
231:
1.296.2.4! yamt 232: pfil_head_t *inet_pfil_hook;
1.121 thorpej 233:
1.275 pooka 234: struct pool inmulti_pool;
1.72 thorpej 235:
1.135 thorpej 236: #ifdef INET_CSUM_COUNTERS
237: #include <sys/device.h>
238:
239: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
240: NULL, "inet", "hwcsum bad");
241: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
242: NULL, "inet", "hwcsum ok");
243: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
244: NULL, "inet", "swcsum");
245:
246: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
247:
1.201 matt 248: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
249: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
250: EVCNT_ATTACH_STATIC(ip_swcsum);
251:
1.135 thorpej 252: #else
253:
254: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
255:
256: #endif /* INET_CSUM_COUNTERS */
257:
1.1 cgd 258: /*
259: * We need to save the IP options in case a protocol wants to respond
260: * to an incoming packet over the same route if the packet got here
261: * using IP source routing. This allows connection establishment and
262: * maintenance when the remote end is on a network that is not known
263: * to us.
264: */
265: int ip_nhops = 0;
266: static struct ip_srcrt {
267: struct in_addr dst; /* final destination */
268: char nop; /* one NOP to align */
269: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
270: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
271: } ip_srcrt;
272:
1.295 dyoung 273: static int ip_drainwanted;
274:
1.210 perry 275: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 276:
1.164 matt 277: #ifdef MBUFTRACE
1.234 dogcow 278: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
279: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 280: #endif
281:
1.284 pooka 282: static void sysctl_net_inet_ip_setup(struct sysctllog **);
283:
1.1 cgd 284: /*
285: * IP initialization: fill in IP protocol switch table.
286: * All protocols not implemented in kernel go to raw IP protocol handler.
287: */
1.8 mycroft 288: void
1.211 perry 289: ip_init(void)
1.1 cgd 290: {
1.199 matt 291: const struct protosw *pr;
1.109 augustss 292: int i;
1.1 cgd 293:
1.284 pooka 294: sysctl_net_inet_ip_setup(NULL);
295:
1.275 pooka 296: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
297: NULL, IPL_SOFTNET);
298:
1.1 cgd 299: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
300: if (pr == 0)
301: panic("ip_init");
302: for (i = 0; i < IPPROTO_MAX; i++)
303: ip_protox[i] = pr - inetsw;
304: for (pr = inetdomain.dom_protosw;
305: pr < inetdomain.dom_protoswNPROTOSW; pr++)
306: if (pr->pr_domain->dom_family == PF_INET &&
307: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
308: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 309:
1.288 rmind 310: ip_reass_init();
1.190 jonathan 311:
1.291 rmind 312: ip_ids = ip_id_init();
1.227 kardel 313: ip_id = time_second & 0xfffff;
1.194 jonathan 314:
1.294 dyoung 315: ipintrq.ifq_maxlen = IFQ_MAXLEN;
1.194 jonathan 316:
1.181 jonathan 317: TAILQ_INIT(&in_ifaddrhead);
1.272 ad 318: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
319: &in_ifaddrhash);
320: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
321: &in_multihash);
1.160 itojun 322: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 323: #ifdef GATEWAY
1.248 liamjfoy 324: ipflow_init(ip_hashsize);
1.73 thorpej 325: #endif
1.121 thorpej 326:
327: /* Register our Packet Filter hook. */
1.296.2.4! yamt 328: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
! 329: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 330:
1.164 matt 331: #ifdef MBUFTRACE
332: MOWNER_ATTACH(&ip_tx_mowner);
333: MOWNER_ATTACH(&ip_rx_mowner);
334: #endif /* MBUFTRACE */
1.266 thorpej 335:
336: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 337: }
338:
1.229 christos 339: struct sockaddr_in ipaddr = {
340: .sin_len = sizeof(ipaddr),
341: .sin_family = AF_INET,
342: };
1.1 cgd 343: struct route ipforward_rt;
344:
345: /*
1.89 itojun 346: * IP software interrupt routine
347: */
348: void
1.211 perry 349: ipintr(void)
1.89 itojun 350: {
351: int s;
352: struct mbuf *m;
1.286 tls 353: struct ifqueue lcl_intrq;
354:
355: memset(&lcl_intrq, 0, sizeof(lcl_intrq));
1.89 itojun 356:
1.268 ad 357: mutex_enter(softnet_lock);
358: KERNEL_LOCK(1, NULL);
1.286 tls 359: if (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 360: s = splnet();
1.286 tls 361:
362: /* Take existing queue onto stack */
363: lcl_intrq = ipintrq;
364:
365: /* Zero out global queue, preserving maxlen and drops */
366: ipintrq.ifq_head = NULL;
367: ipintrq.ifq_tail = NULL;
368: ipintrq.ifq_len = 0;
369: ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
370: ipintrq.ifq_drops = lcl_intrq.ifq_drops;
371:
1.89 itojun 372: splx(s);
1.286 tls 373: }
374: KERNEL_UNLOCK_ONE(NULL);
375: while (!IF_IS_EMPTY(&lcl_intrq)) {
376: IF_DEQUEUE(&lcl_intrq, m);
1.268 ad 377: if (m == NULL)
378: break;
1.89 itojun 379: ip_input(m);
380: }
1.268 ad 381: mutex_exit(softnet_lock);
1.89 itojun 382: }
383:
384: /*
1.1 cgd 385: * Ip input routine. Checksum and byte swap header. If fragmented
386: * try to reassemble. Process options. Pass to next level.
387: */
1.8 mycroft 388: void
1.89 itojun 389: ip_input(struct mbuf *m)
1.1 cgd 390: {
1.109 augustss 391: struct ip *ip = NULL;
392: struct in_ifaddr *ia;
393: struct ifaddr *ifa;
1.288 rmind 394: int hlen = 0, len;
1.100 itojun 395: int downmatch;
1.165 christos 396: int checkif;
1.169 itojun 397: int srcrt = 0;
1.1 cgd 398:
1.164 matt 399: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 400: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164 matt 401:
1.1 cgd 402: /*
403: * If no IP addresses have been set yet but the interfaces
404: * are receiving, can't do anything with incoming packets yet.
405: */
1.181 jonathan 406: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 407: goto bad;
1.266 thorpej 408: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 409: /*
410: * If the IP header is not aligned, slurp it up into a new
411: * mbuf with space for link headers, in the event we forward
412: * it. Otherwise, if it is aligned, make sure the entire
413: * base IP header is in the first mbuf of the chain.
414: */
1.244 christos 415: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 416: if ((m = m_copyup(m, sizeof(struct ip),
417: (max_linkhdr + 3) & ~3)) == NULL) {
418: /* XXXJRT new stat, please */
1.266 thorpej 419: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 420: return;
421: }
422: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
423: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 424: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 425: return;
426: }
1.1 cgd 427: }
428: ip = mtod(m, struct ip *);
1.13 mycroft 429: if (ip->ip_v != IPVERSION) {
1.266 thorpej 430: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 431: goto bad;
432: }
1.1 cgd 433: hlen = ip->ip_hl << 2;
434: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 435: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 436: goto bad;
437: }
438: if (hlen > m->m_len) {
1.296.2.1 yamt 439: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 440: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 441: return;
1.1 cgd 442: }
443: ip = mtod(m, struct ip *);
444: }
1.98 thorpej 445:
1.85 hwr 446: /*
1.99 thorpej 447: * RFC1122: packets with a multicast source address are
1.98 thorpej 448: * not allowed.
1.85 hwr 449: */
450: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 451: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 452: goto bad;
1.129 itojun 453: }
454:
455: /* 127/8 must not appear on wire - RFC1122 */
456: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
457: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 458: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 459: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 460: goto bad;
1.130 itojun 461: }
1.85 hwr 462: }
463:
1.135 thorpej 464: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 465: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 466: M_CSUM_IPv4_BAD)) {
467: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
468: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
469: goto badcsum;
470:
471: case M_CSUM_IPv4:
472: /* Checksum was okay. */
473: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
474: break;
475:
476: default:
1.206 thorpej 477: /*
478: * Must compute it ourselves. Maybe skip checksum on
479: * loopback interfaces.
480: */
481: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
482: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
483: INET_CSUM_COUNTER_INCR(&ip_swcsum);
484: if (in_cksum(m, hlen) != 0)
485: goto badcsum;
486: }
1.135 thorpej 487: break;
1.1 cgd 488: }
489:
1.121 thorpej 490: /* Retrieve the packet length. */
491: len = ntohs(ip->ip_len);
1.81 proff 492:
493: /*
494: * Check for additional length bogosity
495: */
1.84 proff 496: if (len < hlen) {
1.266 thorpej 497: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 498: goto bad;
499: }
1.1 cgd 500:
501: /*
502: * Check that the amount of data in the buffers
503: * is as at least much as the IP header would have us expect.
504: * Trim mbufs if longer than we expect.
505: * Drop packet if shorter than we expect.
506: */
1.35 mycroft 507: if (m->m_pkthdr.len < len) {
1.266 thorpej 508: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 509: goto bad;
510: }
1.35 mycroft 511: if (m->m_pkthdr.len > len) {
1.1 cgd 512: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 513: m->m_len = len;
514: m->m_pkthdr.len = len;
1.1 cgd 515: } else
1.35 mycroft 516: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 517: }
518:
1.64 thorpej 519: /*
520: * Assume that we can create a fast-forward IP flow entry
521: * based on this packet.
522: */
523: m->m_flags |= M_CANFASTFWD;
524:
1.33 mrg 525: /*
1.64 thorpej 526: * Run through list of hooks for input packets. If there are any
527: * filters which require that additional packets in the flow are
528: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
529: * Note that filters must _never_ set this flag, as another filter
530: * in the list may have previously cleared it.
1.33 mrg 531: */
1.127 itojun 532: /*
533: * let ipfilter look at packet on the wire,
534: * not the decapsulated packet.
535: */
1.296.2.4! yamt 536: #if defined(IPSEC)
1.186 scw 537: if (!ipsec_indone(m))
1.127 itojun 538: #else
539: if (1)
540: #endif
541: {
1.169 itojun 542: struct in_addr odst;
543:
544: odst = ip->ip_dst;
1.296.2.4! yamt 545: if (pfil_run_hooks(inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 546: PFIL_IN) != 0)
547: return;
1.127 itojun 548: if (m == NULL)
549: return;
550: ip = mtod(m, struct ip *);
1.142 darrenr 551: hlen = ip->ip_hl << 2;
1.205 darrenr 552: /*
553: * XXX The setting of "srcrt" here is to prevent ip_forward()
554: * from generating ICMP redirects for packets that have
555: * been redirected by a hook back out on to the same LAN that
556: * they came from and is not an indication that the packet
557: * is being inffluenced by source routing options. This
558: * allows things like
559: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
560: * where tlp0 is both on the 1.1.1.0/24 network and is the
561: * default route for hosts on 1.1.1.0/24. Of course this
562: * also requires a "map tlp0 ..." to complete the story.
563: * One might argue whether or not this kind of network config.
1.212 perry 564: * should be supported in this manner...
1.205 darrenr 565: */
1.169 itojun 566: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 567: }
1.123 thorpej 568:
569: #ifdef ALTQ
570: /* XXX Temporary until ALTQ is changed to use a pfil hook */
571: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
572: /* packet dropped by traffic conditioner */
573: return;
574: }
575: #endif
1.121 thorpej 576:
577: /*
1.1 cgd 578: * Process options and, if not destined for us,
579: * ship it on. ip_dooptions returns 1 when an
580: * error was detected (causing an icmp message
581: * to be sent and the original packet to be freed).
582: */
583: ip_nhops = 0; /* for source routed packets */
584: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 585: return;
1.1 cgd 586:
587: /*
1.165 christos 588: * Enable a consistency check between the destination address
589: * and the arrival interface for a unicast packet (the RFC 1122
590: * strong ES model) if IP forwarding is disabled and the packet
591: * is not locally generated.
592: *
593: * XXX - Checking also should be disabled if the destination
594: * address is ipnat'ed to a different interface.
595: *
596: * XXX - Checking is incompatible with IP aliases added
597: * to the loopback interface instead of the interface where
598: * the packets are received.
599: *
600: * XXX - We need to add a per ifaddr flag for this so that
601: * we get finer grain control.
602: */
603: checkif = ip_checkinterface && (ipforwarding == 0) &&
604: (m->m_pkthdr.rcvif != NULL) &&
605: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
606:
607: /*
1.1 cgd 608: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 609: *
610: * Traditional 4.4BSD did not consult IFF_UP at all.
611: * The behavior here is to treat addresses on !IFF_UP interface
612: * as not mine.
1.1 cgd 613: */
1.100 itojun 614: downmatch = 0;
1.140 matt 615: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 616: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 617: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
618: continue;
1.97 itojun 619: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
620: break;
1.100 itojun 621: else
622: downmatch++;
1.97 itojun 623: }
624: }
1.86 thorpej 625: if (ia != NULL)
626: goto ours;
1.225 christos 627: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 628: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 629: if (ifa->ifa_addr->sa_family != AF_INET)
630: continue;
1.57 tls 631: ia = ifatoia(ifa);
1.35 mycroft 632: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
633: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 634: /*
635: * Look for all-0's host part (old broadcast addr),
636: * either for subnet or net.
637: */
638: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 639: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 640: goto ours;
1.57 tls 641: /*
642: * An interface with IP address zero accepts
643: * all packets that arrive on that interface.
644: */
645: if (in_nullhost(ia->ia_addr.sin_addr))
646: goto ours;
1.1 cgd 647: }
648: }
1.18 mycroft 649: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 650: struct in_multi *inm;
651: #ifdef MROUTING
652: extern struct socket *ip_mrouter;
1.10 brezak 653:
1.4 hpeyerl 654: if (ip_mrouter) {
655: /*
656: * If we are acting as a multicast router, all
657: * incoming multicast packets are passed to the
658: * kernel-level multicast forwarding function.
659: * The packet is returned (relatively) intact; if
660: * ip_mforward() returns a non-zero value, the packet
661: * must be discarded, else it may be accepted below.
662: *
663: * (The IP ident field is put in the same byte order
664: * as expected when ip_mforward() is called from
665: * ip_output().)
666: */
1.13 mycroft 667: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 668: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 669: m_freem(m);
1.89 itojun 670: return;
1.4 hpeyerl 671: }
672:
673: /*
674: * The process-level routing demon needs to receive
675: * all multicast IGMP packets, whether or not this
676: * host belongs to their destination groups.
677: */
678: if (ip->ip_p == IPPROTO_IGMP)
679: goto ours;
1.266 thorpej 680: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 681: }
682: #endif
683: /*
684: * See if we belong to the destination multicast group on the
685: * arrival interface.
686: */
687: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
688: if (inm == NULL) {
1.266 thorpej 689: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 690: m_freem(m);
1.89 itojun 691: return;
1.4 hpeyerl 692: }
693: goto ours;
694: }
1.19 mycroft 695: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 696: in_nullhost(ip->ip_dst))
1.1 cgd 697: goto ours;
698:
699: /*
700: * Not for us; forward if possible and desirable.
701: */
702: if (ipforwarding == 0) {
1.266 thorpej 703: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 704: m_freem(m);
1.100 itojun 705: } else {
706: /*
707: * If ip_dst matched any of my address on !IFF_UP interface,
708: * and there's no IFF_UP interface that matches ip_dst,
709: * send icmp unreach. Forwarding it will result in in-kernel
710: * forwarding loop till TTL goes to 0.
711: */
712: if (downmatch) {
713: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 714: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 715: return;
716: }
1.296.2.4! yamt 717: #ifdef IPSEC
! 718: /* Perform IPsec, if any. */
! 719: if (ipsec4_input(m, IP_FORWARDING | (ip_directedbcast ?
! 720: IP_ALLOWBROADCAST : 0)) != 0) {
1.173 jonathan 721: goto bad;
722: }
1.296.2.4! yamt 723: #endif
1.169 itojun 724: ip_forward(m, srcrt);
1.100 itojun 725: }
1.89 itojun 726: return;
1.1 cgd 727:
728: ours:
729: /*
730: * If offset or IP_MF are set, must reassemble.
731: */
1.155 itojun 732: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 733: /*
734: * Pass to IP reassembly mechanism.
735: */
1.290 rmind 736: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 737: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 738: goto bad;
1.16 cgd 739: }
1.290 rmind 740: if (m == NULL) {
1.289 rmind 741: /* More fragments should come; silently return. */
742: return;
743: }
1.290 rmind 744: /*
745: * Reassembly is done, we have the final packet.
746: * Updated cached data in local variable(s).
747: */
1.289 rmind 748: ip = mtod(m, struct ip *);
749: hlen = ip->ip_hl << 2;
1.79 mycroft 750: }
1.128 itojun 751:
1.296.2.4! yamt 752: #ifdef IPSEC
1.173 jonathan 753: /*
1.296.2.4! yamt 754: * Enforce IPsec policy checking if we are seeing last header.
! 755: * Note that we do not visit this with protocols with PCB layer
! 756: * code - like UDP/TCP/raw IP.
1.173 jonathan 757: */
758: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.296.2.4! yamt 759: if (ipsec4_input(m, 0) != 0) {
1.173 jonathan 760: goto bad;
1.296.2.4! yamt 761: }
1.173 jonathan 762: }
1.296.2.4! yamt 763: #endif
1.1 cgd 764:
765: /*
766: * Switch out to protocol's input routine.
767: */
1.82 aidan 768: #if IFA_STATS
1.122 itojun 769: if (ia && ip)
1.155 itojun 770: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 771: #endif
1.266 thorpej 772: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 773: {
774: int off = hlen, nh = ip->ip_p;
775:
776: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
777: return;
778: }
1.1 cgd 779: bad:
780: m_freem(m);
1.135 thorpej 781: return;
782:
783: badcsum:
1.266 thorpej 784: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 785: m_freem(m);
1.1 cgd 786: }
787:
788: /*
1.288 rmind 789: * IP timer processing.
1.1 cgd 790: */
1.8 mycroft 791: void
1.211 perry 792: ip_slowtimo(void)
1.1 cgd 793: {
1.268 ad 794:
795: mutex_enter(softnet_lock);
796: KERNEL_LOCK(1, NULL);
1.1 cgd 797:
1.288 rmind 798: ip_reass_slowtimo();
1.268 ad 799:
800: KERNEL_UNLOCK_ONE(NULL);
801: mutex_exit(softnet_lock);
1.1 cgd 802: }
803:
804: /*
1.288 rmind 805: * IP drain processing.
1.1 cgd 806: */
1.8 mycroft 807: void
1.211 perry 808: ip_drain(void)
1.1 cgd 809: {
810:
1.268 ad 811: KERNEL_LOCK(1, NULL);
1.288 rmind 812: ip_reass_drain();
1.268 ad 813: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 814: }
815:
816: /*
817: * Do option processing on a datagram,
818: * possibly discarding it if bad options are encountered,
819: * or forwarding it if source-routed.
820: * Returns 1 if packet has been forwarded/freed,
821: * 0 if the packet should be processed further.
822: */
1.8 mycroft 823: int
1.211 perry 824: ip_dooptions(struct mbuf *m)
1.1 cgd 825: {
1.109 augustss 826: struct ip *ip = mtod(m, struct ip *);
827: u_char *cp, *cp0;
828: struct ip_timestamp *ipt;
829: struct in_ifaddr *ia;
1.1 cgd 830: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 831: struct in_addr dst;
1.1 cgd 832: n_time ntime;
833:
1.13 mycroft 834: dst = ip->ip_dst;
1.1 cgd 835: cp = (u_char *)(ip + 1);
836: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
837: for (; cnt > 0; cnt -= optlen, cp += optlen) {
838: opt = cp[IPOPT_OPTVAL];
839: if (opt == IPOPT_EOL)
840: break;
841: if (opt == IPOPT_NOP)
842: optlen = 1;
843: else {
1.113 itojun 844: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
845: code = &cp[IPOPT_OLEN] - (u_char *)ip;
846: goto bad;
847: }
1.1 cgd 848: optlen = cp[IPOPT_OLEN];
1.114 itojun 849: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 850: code = &cp[IPOPT_OLEN] - (u_char *)ip;
851: goto bad;
852: }
853: }
854: switch (opt) {
855:
856: default:
857: break;
858:
859: /*
860: * Source routing with record.
861: * Find interface with current destination address.
862: * If none on this machine then drop if strictly routed,
863: * or do nothing if loosely routed.
864: * Record interface address and bring up next address
865: * component. If strictly routed make sure next
866: * address is on directly accessible net.
867: */
868: case IPOPT_LSRR:
869: case IPOPT_SSRR:
1.47 cjs 870: if (ip_allowsrcrt == 0) {
871: type = ICMP_UNREACH;
872: code = ICMP_UNREACH_NET_PROHIB;
873: goto bad;
874: }
1.114 itojun 875: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
876: code = &cp[IPOPT_OLEN] - (u_char *)ip;
877: goto bad;
878: }
1.1 cgd 879: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
880: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
881: goto bad;
882: }
883: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 884: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 885: if (ia == 0) {
886: if (opt == IPOPT_SSRR) {
887: type = ICMP_UNREACH;
888: code = ICMP_UNREACH_SRCFAIL;
889: goto bad;
890: }
891: /*
892: * Loose routing, and not at next destination
893: * yet; nothing to do except forward.
894: */
895: break;
896: }
897: off--; /* 0 origin */
1.112 sommerfe 898: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 899: /*
900: * End of source route. Should be for us.
901: */
902: save_rte(cp, ip->ip_src);
903: break;
904: }
905: /*
906: * locate outgoing interface
907: */
1.281 tsutsui 908: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 909: sizeof(ipaddr.sin_addr));
1.96 thorpej 910: if (opt == IPOPT_SSRR)
1.196 itojun 911: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 912: else
1.1 cgd 913: ia = ip_rtaddr(ipaddr.sin_addr);
914: if (ia == 0) {
915: type = ICMP_UNREACH;
916: code = ICMP_UNREACH_SRCFAIL;
917: goto bad;
918: }
919: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 920: bcopy((void *)&ia->ia_addr.sin_addr,
921: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 922: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 923: /*
924: * Let ip_intr's mcast routing check handle mcast pkts
925: */
1.18 mycroft 926: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 927: break;
928:
929: case IPOPT_RR:
1.114 itojun 930: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
931: code = &cp[IPOPT_OLEN] - (u_char *)ip;
932: goto bad;
933: }
1.1 cgd 934: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
935: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
936: goto bad;
937: }
938: /*
939: * If no space remains, ignore.
940: */
941: off--; /* 0 origin */
1.112 sommerfe 942: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 943: break;
1.281 tsutsui 944: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 945: sizeof(ipaddr.sin_addr));
946: /*
947: * locate outgoing interface; if we're the destination,
948: * use the incoming interface (should be same).
949: */
1.96 thorpej 950: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
951: == NULL &&
952: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 953: type = ICMP_UNREACH;
954: code = ICMP_UNREACH_HOST;
955: goto bad;
956: }
1.244 christos 957: bcopy((void *)&ia->ia_addr.sin_addr,
958: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 959: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
960: break;
961:
962: case IPOPT_TS:
963: code = cp - (u_char *)ip;
964: ipt = (struct ip_timestamp *)cp;
1.114 itojun 965: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
966: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 967: goto bad;
1.114 itojun 968: }
969: if (ipt->ipt_ptr < 5) {
970: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
971: goto bad;
972: }
1.15 cgd 973: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 974: if (++ipt->ipt_oflw == 0) {
975: code = (u_char *)&ipt->ipt_ptr -
976: (u_char *)ip;
1.1 cgd 977: goto bad;
1.114 itojun 978: }
1.1 cgd 979: break;
980: }
1.104 thorpej 981: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 982: switch (ipt->ipt_flg) {
983:
984: case IPOPT_TS_TSONLY:
985: break;
986:
987: case IPOPT_TS_TSANDADDR:
1.66 thorpej 988: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 989: sizeof(struct in_addr) > ipt->ipt_len) {
990: code = (u_char *)&ipt->ipt_ptr -
991: (u_char *)ip;
1.1 cgd 992: goto bad;
1.114 itojun 993: }
1.13 mycroft 994: ipaddr.sin_addr = dst;
1.96 thorpej 995: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
996: m->m_pkthdr.rcvif));
1.13 mycroft 997: if (ia == 0)
998: continue;
1.104 thorpej 999: bcopy(&ia->ia_addr.sin_addr,
1000: cp0, sizeof(struct in_addr));
1.1 cgd 1001: ipt->ipt_ptr += sizeof(struct in_addr);
1002: break;
1003:
1004: case IPOPT_TS_PRESPEC:
1.66 thorpej 1005: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1006: sizeof(struct in_addr) > ipt->ipt_len) {
1007: code = (u_char *)&ipt->ipt_ptr -
1008: (u_char *)ip;
1.1 cgd 1009: goto bad;
1.114 itojun 1010: }
1.281 tsutsui 1011: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1012: sizeof(struct in_addr));
1.96 thorpej 1013: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1014: == NULL)
1.1 cgd 1015: continue;
1016: ipt->ipt_ptr += sizeof(struct in_addr);
1017: break;
1018:
1019: default:
1.114 itojun 1020: /* XXX can't take &ipt->ipt_flg */
1021: code = (u_char *)&ipt->ipt_ptr -
1022: (u_char *)ip + 1;
1.1 cgd 1023: goto bad;
1024: }
1025: ntime = iptime();
1.107 thorpej 1026: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1027: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1028: sizeof(n_time));
1029: ipt->ipt_ptr += sizeof(n_time);
1030: }
1031: }
1032: if (forward) {
1.26 thorpej 1033: if (ip_forwsrcrt == 0) {
1034: type = ICMP_UNREACH;
1035: code = ICMP_UNREACH_SRCFAIL;
1036: goto bad;
1037: }
1.1 cgd 1038: ip_forward(m, 1);
1039: return (1);
1.13 mycroft 1040: }
1041: return (0);
1.1 cgd 1042: bad:
1.13 mycroft 1043: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1044: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1045: return (1);
1046: }
1047:
1048: /*
1049: * Given address of next destination (final or next hop),
1050: * return internet address info of interface to be used to get there.
1051: */
1052: struct in_ifaddr *
1.211 perry 1053: ip_rtaddr(struct in_addr dst)
1.1 cgd 1054: {
1.249 dyoung 1055: struct rtentry *rt;
1056: union {
1057: struct sockaddr dst;
1058: struct sockaddr_in dst4;
1059: } u;
1060:
1061: sockaddr_in_init(&u.dst4, &dst, 0);
1062:
1063: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1064: return NULL;
1065:
1066: return ifatoia(rt->rt_ifa);
1.1 cgd 1067: }
1068:
1069: /*
1070: * Save incoming source route for use in replies,
1071: * to be picked up later by ip_srcroute if the receiver is interested.
1072: */
1.13 mycroft 1073: void
1.211 perry 1074: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1075: {
1076: unsigned olen;
1077:
1078: olen = option[IPOPT_OLEN];
1079: #ifdef DIAGNOSTIC
1080: if (ipprintfs)
1.39 christos 1081: printf("save_rte: olen %d\n", olen);
1.89 itojun 1082: #endif /* 0 */
1.1 cgd 1083: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1084: return;
1.281 tsutsui 1085: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1086: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1087: ip_srcrt.dst = dst;
1088: }
1089:
1090: /*
1091: * Retrieve incoming source route for use in replies,
1092: * in the same form used by setsockopt.
1093: * The first hop is placed before the options, will be removed later.
1094: */
1095: struct mbuf *
1.211 perry 1096: ip_srcroute(void)
1.1 cgd 1097: {
1.109 augustss 1098: struct in_addr *p, *q;
1099: struct mbuf *m;
1.1 cgd 1100:
1101: if (ip_nhops == 0)
1.237 dyoung 1102: return NULL;
1.1 cgd 1103: m = m_get(M_DONTWAIT, MT_SOOPTS);
1104: if (m == 0)
1.237 dyoung 1105: return NULL;
1.1 cgd 1106:
1.164 matt 1107: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1108: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1109:
1110: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1111: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1112: OPTSIZ;
1113: #ifdef DIAGNOSTIC
1114: if (ipprintfs)
1.39 christos 1115: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1116: #endif
1117:
1118: /*
1119: * First save first hop for return route
1120: */
1121: p = &ip_srcrt.route[ip_nhops - 1];
1122: *(mtod(m, struct in_addr *)) = *p--;
1123: #ifdef DIAGNOSTIC
1124: if (ipprintfs)
1.39 christos 1125: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1126: #endif
1127:
1128: /*
1129: * Copy option fields and padding (nop) to mbuf.
1130: */
1131: ip_srcrt.nop = IPOPT_NOP;
1132: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1133: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1134: OPTSIZ);
1135: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1136: sizeof(struct in_addr) + OPTSIZ);
1137: #undef OPTSIZ
1138: /*
1139: * Record return path as an IP source route,
1140: * reversing the path (pointers are now aligned).
1141: */
1142: while (p >= ip_srcrt.route) {
1143: #ifdef DIAGNOSTIC
1144: if (ipprintfs)
1.39 christos 1145: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1146: #endif
1147: *q++ = *p--;
1148: }
1149: /*
1150: * Last hop goes to final destination.
1151: */
1152: *q = ip_srcrt.dst;
1153: #ifdef DIAGNOSTIC
1154: if (ipprintfs)
1.39 christos 1155: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1156: #endif
1157: return (m);
1158: }
1159:
1.139 matt 1160: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1161: [PRC_MSGSIZE] = EMSGSIZE,
1162: [PRC_HOSTDEAD] = EHOSTDOWN,
1163: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1164: [PRC_UNREACH_NET] = EHOSTUNREACH,
1165: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1166: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1167: [PRC_UNREACH_PORT] = ECONNREFUSED,
1168: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1169: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1170: };
1171:
1.295 dyoung 1172: void
1173: ip_fasttimo(void)
1174: {
1175: if (ip_drainwanted) {
1176: ip_drain();
1177: ip_drainwanted = 0;
1178: }
1179: }
1180:
1181: void
1182: ip_drainstub(void)
1183: {
1184: ip_drainwanted = 1;
1185: }
1186:
1.1 cgd 1187: /*
1188: * Forward a packet. If some error occurs return the sender
1189: * an icmp packet. Note we can't always generate a meaningful
1190: * icmp message because icmp doesn't have a large enough repertoire
1191: * of codes and types.
1192: *
1193: * If not forwarding, just drop the packet. This could be confusing
1194: * if ipforwarding was zero but some routing protocol was advancing
1195: * us as a gateway to somewhere. However, we must let the routing
1196: * protocol deal with that.
1197: *
1198: * The srcrt parameter indicates whether the packet is being forwarded
1199: * via a source route.
1200: */
1.13 mycroft 1201: void
1.211 perry 1202: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1203: {
1.109 augustss 1204: struct ip *ip = mtod(m, struct ip *);
1205: struct rtentry *rt;
1.220 christos 1206: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1207: struct mbuf *mcopy;
1.13 mycroft 1208: n_long dest;
1.249 dyoung 1209: union {
1210: struct sockaddr dst;
1211: struct sockaddr_in dst4;
1212: } u;
1.164 matt 1213:
1214: /*
1215: * We are now in the output path.
1216: */
1217: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1218:
1219: /*
1220: * Clear any in-bound checksum flags for this packet.
1221: */
1222: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1223:
1.13 mycroft 1224: dest = 0;
1.1 cgd 1225: #ifdef DIAGNOSTIC
1.224 joerg 1226: if (ipprintfs) {
1227: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1228: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1229: }
1.1 cgd 1230: #endif
1.93 sommerfe 1231: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1232: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1233: m_freem(m);
1234: return;
1235: }
1236: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1237: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1238: return;
1239: }
1240:
1.249 dyoung 1241: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1242: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1243: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1244: return;
1.1 cgd 1245: }
1246:
1247: /*
1.34 mycroft 1248: * Save at most 68 bytes of the packet in case
1.1 cgd 1249: * we need to generate an ICMP message to the src.
1.119 itojun 1250: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1251: */
1.155 itojun 1252: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1253: if (mcopy)
1254: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1255:
1.221 christos 1256: ip->ip_ttl -= IPTTLDEC;
1257:
1.1 cgd 1258: /*
1259: * If forwarding packet using same interface that it came in on,
1260: * perhaps should send a redirect to sender to shortcut a hop.
1261: * Only send redirect if source is sending directly to us,
1262: * and if packet was not source routed (or has any options).
1263: * Also, don't send redirect if forwarding using a default route
1264: * or a route modified by a redirect.
1265: */
1266: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1267: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1268: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1269: ipsendredirects && !srcrt) {
1.19 mycroft 1270: if (rt->rt_ifa &&
1271: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1272: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1273: if (rt->rt_flags & RTF_GATEWAY)
1274: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1275: else
1276: dest = ip->ip_dst.s_addr;
1277: /*
1278: * Router requirements says to only send host
1279: * redirects.
1280: */
1281: type = ICMP_REDIRECT;
1282: code = ICMP_REDIRECT_HOST;
1.1 cgd 1283: #ifdef DIAGNOSTIC
1.77 thorpej 1284: if (ipprintfs)
1285: printf("redirect (%d) to %x\n", code,
1286: (u_int32_t)dest);
1.1 cgd 1287: #endif
1288: }
1289: }
1290:
1.238 dyoung 1291: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1292: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1293: NULL, NULL);
1.173 jonathan 1294:
1.1 cgd 1295: if (error)
1.266 thorpej 1296: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1297: else {
1.266 thorpej 1298: uint64_t *ips = IP_STAT_GETREF();
1299: ips[IP_STAT_FORWARD]++;
1300: if (type) {
1301: ips[IP_STAT_REDIRECTSENT]++;
1302: IP_STAT_PUTREF();
1303: } else {
1304: IP_STAT_PUTREF();
1.63 matt 1305: if (mcopy) {
1306: #ifdef GATEWAY
1.64 thorpej 1307: if (mcopy->m_flags & M_CANFASTFWD)
1308: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1309: #endif
1.1 cgd 1310: m_freem(mcopy);
1.63 matt 1311: }
1.1 cgd 1312: return;
1313: }
1314: }
1315: if (mcopy == NULL)
1316: return;
1.13 mycroft 1317:
1.1 cgd 1318: switch (error) {
1319:
1320: case 0: /* forwarded, but need redirect */
1321: /* type, code set above */
1322: break;
1323:
1324: case ENETUNREACH: /* shouldn't happen, checked above */
1325: case EHOSTUNREACH:
1326: case ENETDOWN:
1327: case EHOSTDOWN:
1328: default:
1329: type = ICMP_UNREACH;
1330: code = ICMP_UNREACH_HOST;
1331: break;
1332:
1333: case EMSGSIZE:
1334: type = ICMP_UNREACH;
1335: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1336:
1.274 seanb 1337: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1338: destmtu = rt->rt_ifp->if_mtu;
1.296.2.4! yamt 1339: #ifdef IPSEC
! 1340: (void)ipsec4_forward(mcopy, &destmtu);
! 1341: #endif
1.266 thorpej 1342: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1343: break;
1344:
1345: case ENOBUFS:
1.143 itojun 1346: #if 1
1347: /*
1348: * a router should not generate ICMP_SOURCEQUENCH as
1349: * required in RFC1812 Requirements for IP Version 4 Routers.
1350: * source quench could be a big problem under DoS attacks,
1.149 wiz 1351: * or if the underlying interface is rate-limited.
1.143 itojun 1352: */
1353: if (mcopy)
1354: m_freem(mcopy);
1355: return;
1356: #else
1.1 cgd 1357: type = ICMP_SOURCEQUENCH;
1358: code = 0;
1359: break;
1.143 itojun 1360: #endif
1.1 cgd 1361: }
1.220 christos 1362: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 1363: }
1364:
1365: void
1.211 perry 1366: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1367: struct mbuf *m)
1.44 thorpej 1368: {
1369:
1.283 minskim 1370: if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278 christos 1371: #ifdef SO_OTIMESTAMP
1.283 minskim 1372: || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278 christos 1373: #endif
1374: ) {
1.44 thorpej 1375: struct timeval tv;
1376:
1377: microtime(&tv);
1.278 christos 1378: #ifdef SO_OTIMESTAMP
1379: if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
1380: struct timeval50 tv50;
1381: timeval_to_timeval50(&tv, &tv50);
1382: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1383: SCM_OTIMESTAMP, SOL_SOCKET);
1384: } else
1385: #endif
1.244 christos 1386: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1387: SCM_TIMESTAMP, SOL_SOCKET);
1388: if (*mp)
1389: mp = &(*mp)->m_next;
1390: }
1391: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 1392: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1393: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1394: if (*mp)
1395: mp = &(*mp)->m_next;
1396: }
1.296.2.4! yamt 1397: if (inp->inp_flags & INP_RECVPKTINFO) {
! 1398: struct in_pktinfo ipi;
! 1399: ipi.ipi_addr = ip->ip_src;
! 1400: ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index;
! 1401: *mp = sbcreatecontrol((void *) &ipi,
! 1402: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
! 1403: if (*mp)
! 1404: mp = &(*mp)->m_next;
! 1405: }
! 1406: if (inp->inp_flags & INP_PKTINFO) {
! 1407: struct in_pktinfo ipi;
! 1408: ipi.ipi_addr = ip->ip_dst;
! 1409: ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index;
! 1410: *mp = sbcreatecontrol((void *) &ipi,
! 1411: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
! 1412: if (*mp)
! 1413: mp = &(*mp)->m_next;
! 1414: }
1.44 thorpej 1415: #ifdef notyet
1416: /*
1417: * XXX
1418: * Moving these out of udp_input() made them even more broken
1419: * than they already were.
1420: * - fenner@parc.xerox.com
1421: */
1422: /* options were tossed already */
1423: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 1424: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 1425: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1426: if (*mp)
1427: mp = &(*mp)->m_next;
1428: }
1429: /* ip_srcroute doesn't do what we want here, need to fix */
1430: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 1431: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 1432: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1433: if (*mp)
1434: mp = &(*mp)->m_next;
1435: }
1436: #endif
1437: if (inp->inp_flags & INP_RECVIF) {
1438: struct sockaddr_dl sdl;
1439:
1.252 dyoung 1440: sockaddr_dl_init(&sdl, sizeof(sdl),
1441: (m->m_pkthdr.rcvif != NULL)
1442: ? m->m_pkthdr.rcvif->if_index
1443: : 0,
1444: 0, NULL, 0, NULL, 0);
1.251 dyoung 1445: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1446: if (*mp)
1447: mp = &(*mp)->m_next;
1448: }
1.282 minskim 1449: if (inp->inp_flags & INP_RECVTTL) {
1450: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1451: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1452: if (*mp)
1453: mp = &(*mp)->m_next;
1454: }
1.13 mycroft 1455: }
1456:
1.189 atatat 1457: /*
1.228 elad 1458: * sysctl helper routine for net.inet.ip.forwsrcrt.
1459: */
1460: static int
1461: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1462: {
1463: int error, tmp;
1464: struct sysctlnode node;
1465:
1466: node = *rnode;
1467: tmp = ip_forwsrcrt;
1468: node.sysctl_data = &tmp;
1469: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1470: if (error || newp == NULL)
1471: return (error);
1472:
1.280 elad 1473: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1474: 0, NULL, NULL, NULL);
1475: if (error)
1476: return (error);
1.228 elad 1477:
1478: ip_forwsrcrt = tmp;
1479:
1480: return (0);
1481: }
1482:
1483: /*
1.189 atatat 1484: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1485: * range of the new value and tweaks timers if it changes.
1486: */
1487: static int
1488: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1489: {
1.189 atatat 1490: int error, tmp;
1491: struct sysctlnode node;
1492:
1493: node = *rnode;
1494: tmp = ip_mtudisc_timeout;
1495: node.sysctl_data = &tmp;
1496: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1497: if (error || newp == NULL)
1498: return (error);
1499: if (tmp < 0)
1500: return (EINVAL);
1.52 thorpej 1501:
1.273 matt 1502: mutex_enter(softnet_lock);
1503:
1.189 atatat 1504: ip_mtudisc_timeout = tmp;
1505: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1506:
1.273 matt 1507: mutex_exit(softnet_lock);
1508:
1.189 atatat 1509: return (0);
1510: }
1.54 lukem 1511:
1.65 matt 1512: #ifdef GATEWAY
1.189 atatat 1513: /*
1.247 liamjfoy 1514: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 1515: */
1516: static int
1517: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
1518: {
1.273 matt 1519: int error;
1.67 thorpej 1520:
1.273 matt 1521: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1522: if (error || newp == NULL)
1523: return (error);
1524:
1525: mutex_enter(softnet_lock);
1526: KERNEL_LOCK(1, NULL);
1.212 perry 1527:
1.296.2.4! yamt 1528: ipflow_reap(false);
1.273 matt 1529:
1530: KERNEL_UNLOCK_ONE(NULL);
1531: mutex_exit(softnet_lock);
1.144 martin 1532:
1.189 atatat 1533: return (0);
1534: }
1.248 liamjfoy 1535:
1536: static int
1537: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283 minskim 1538: {
1.248 liamjfoy 1539: int error, tmp;
1540: struct sysctlnode node;
1541:
1542: node = *rnode;
1543: tmp = ip_hashsize;
1544: node.sysctl_data = &tmp;
1545: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1546: if (error || newp == NULL)
1547: return (error);
1548:
1549: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1550: /*
1551: * Can only fail due to malloc()
1552: */
1.273 matt 1553: mutex_enter(softnet_lock);
1554: KERNEL_LOCK(1, NULL);
1555:
1556: error = ipflow_invalidate_all(tmp);
1557:
1558: KERNEL_UNLOCK_ONE(NULL);
1559: mutex_exit(softnet_lock);
1560:
1.248 liamjfoy 1561: } else {
1562: /*
1563: * EINVAL if not a power of 2
1564: */
1.273 matt 1565: error = EINVAL;
1.283 minskim 1566: }
1.248 liamjfoy 1567:
1.273 matt 1568: return error;
1.248 liamjfoy 1569: }
1.189 atatat 1570: #endif /* GATEWAY */
1.117 tron 1571:
1.266 thorpej 1572: static int
1573: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1574: {
1575:
1.271 thorpej 1576: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1577: }
1.131 itojun 1578:
1.284 pooka 1579: static void
1580: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1581: {
1582: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 1583:
1.197 atatat 1584: sysctl_createv(clog, 0, NULL, NULL,
1585: CTLFLAG_PERMANENT,
1.203 atatat 1586: CTLTYPE_NODE, "inet",
1587: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1588: NULL, 0, NULL, 0,
1589: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1590: sysctl_createv(clog, 0, NULL, NULL,
1591: CTLFLAG_PERMANENT,
1.203 atatat 1592: CTLTYPE_NODE, "ip",
1593: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1594: NULL, 0, NULL, 0,
1595: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1596:
1.197 atatat 1597: sysctl_createv(clog, 0, NULL, NULL,
1598: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1599: CTLTYPE_INT, "forwarding",
1600: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1601: NULL, 0, &ipforwarding, 0,
1602: CTL_NET, PF_INET, IPPROTO_IP,
1603: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1604: sysctl_createv(clog, 0, NULL, NULL,
1605: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1606: CTLTYPE_INT, "redirect",
1607: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1608: NULL, 0, &ipsendredirects, 0,
1609: CTL_NET, PF_INET, IPPROTO_IP,
1610: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1611: sysctl_createv(clog, 0, NULL, NULL,
1612: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1613: CTLTYPE_INT, "ttl",
1614: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1615: NULL, 0, &ip_defttl, 0,
1616: CTL_NET, PF_INET, IPPROTO_IP,
1617: IPCTL_DEFTTL, CTL_EOL);
1618: #ifdef IPCTL_DEFMTU
1.197 atatat 1619: sysctl_createv(clog, 0, NULL, NULL,
1620: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1621: CTLTYPE_INT, "mtu",
1622: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1623: NULL, 0, &ip_mtu, 0,
1624: CTL_NET, PF_INET, IPPROTO_IP,
1625: IPCTL_DEFMTU, CTL_EOL);
1626: #endif /* IPCTL_DEFMTU */
1.197 atatat 1627: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1628: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1629: CTLTYPE_INT, "forwsrcrt",
1630: SYSCTL_DESCR("Enable forwarding of source-routed "
1631: "datagrams"),
1.228 elad 1632: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1633: CTL_NET, PF_INET, IPPROTO_IP,
1634: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1635: sysctl_createv(clog, 0, NULL, NULL,
1636: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1637: CTLTYPE_INT, "directed-broadcast",
1638: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1639: NULL, 0, &ip_directedbcast, 0,
1640: CTL_NET, PF_INET, IPPROTO_IP,
1641: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1642: sysctl_createv(clog, 0, NULL, NULL,
1643: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1644: CTLTYPE_INT, "allowsrcrt",
1645: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1646: NULL, 0, &ip_allowsrcrt, 0,
1647: CTL_NET, PF_INET, IPPROTO_IP,
1648: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 1649: sysctl_createv(clog, 0, NULL, NULL,
1650: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1651: CTLTYPE_INT, "subnetsarelocal",
1652: SYSCTL_DESCR("Whether logical subnets are considered "
1653: "local"),
1.189 atatat 1654: NULL, 0, &subnetsarelocal, 0,
1655: CTL_NET, PF_INET, IPPROTO_IP,
1656: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 1657: sysctl_createv(clog, 0, NULL, NULL,
1658: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1659: CTLTYPE_INT, "mtudisc",
1660: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1661: NULL, 0, &ip_mtudisc, 0,
1662: CTL_NET, PF_INET, IPPROTO_IP,
1663: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1664: sysctl_createv(clog, 0, NULL, NULL,
1665: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1666: CTLTYPE_INT, "anonportmin",
1667: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1668: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1669: CTL_NET, PF_INET, IPPROTO_IP,
1670: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1671: sysctl_createv(clog, 0, NULL, NULL,
1672: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1673: CTLTYPE_INT, "anonportmax",
1674: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1675: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1676: CTL_NET, PF_INET, IPPROTO_IP,
1677: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1678: sysctl_createv(clog, 0, NULL, NULL,
1679: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1680: CTLTYPE_INT, "mtudisctimeout",
1681: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.296.2.2 yamt 1682: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1683: CTL_NET, PF_INET, IPPROTO_IP,
1684: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1685: #ifdef GATEWAY
1.197 atatat 1686: sysctl_createv(clog, 0, NULL, NULL,
1687: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1688: CTLTYPE_INT, "maxflows",
1689: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 1690: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
1691: CTL_NET, PF_INET, IPPROTO_IP,
1692: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 1693: sysctl_createv(clog, 0, NULL, NULL,
1694: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1695: CTLTYPE_INT, "hashsize",
1696: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
1697: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
1698: CTL_NET, PF_INET, IPPROTO_IP,
1699: CTL_CREATE, CTL_EOL);
1.189 atatat 1700: #endif /* GATEWAY */
1.197 atatat 1701: sysctl_createv(clog, 0, NULL, NULL,
1702: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1703: CTLTYPE_INT, "hostzerobroadcast",
1704: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 1705: NULL, 0, &hostzeroisbroadcast, 0,
1706: CTL_NET, PF_INET, IPPROTO_IP,
1707: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
1708: #if NGIF > 0
1.197 atatat 1709: sysctl_createv(clog, 0, NULL, NULL,
1710: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1711: CTLTYPE_INT, "gifttl",
1712: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 1713: NULL, 0, &ip_gif_ttl, 0,
1714: CTL_NET, PF_INET, IPPROTO_IP,
1715: IPCTL_GIF_TTL, CTL_EOL);
1716: #endif /* NGIF */
1717: #ifndef IPNOPRIVPORTS
1.197 atatat 1718: sysctl_createv(clog, 0, NULL, NULL,
1719: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1720: CTLTYPE_INT, "lowportmin",
1721: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1722: "to assign"),
1.189 atatat 1723: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1724: CTL_NET, PF_INET, IPPROTO_IP,
1725: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1726: sysctl_createv(clog, 0, NULL, NULL,
1727: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1728: CTLTYPE_INT, "lowportmax",
1729: SYSCTL_DESCR("Highest privileged ephemeral port number "
1730: "to assign"),
1.189 atatat 1731: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1732: CTL_NET, PF_INET, IPPROTO_IP,
1733: IPCTL_LOWPORTMAX, CTL_EOL);
1734: #endif /* IPNOPRIVPORTS */
1735: #if NGRE > 0
1.197 atatat 1736: sysctl_createv(clog, 0, NULL, NULL,
1737: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1738: CTLTYPE_INT, "grettl",
1739: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1740: NULL, 0, &ip_gre_ttl, 0,
1741: CTL_NET, PF_INET, IPPROTO_IP,
1742: IPCTL_GRE_TTL, CTL_EOL);
1743: #endif /* NGRE */
1.197 atatat 1744: sysctl_createv(clog, 0, NULL, NULL,
1745: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1746: CTLTYPE_INT, "checkinterface",
1747: SYSCTL_DESCR("Enable receive side of Strong ES model "
1748: "from RFC1122"),
1.189 atatat 1749: NULL, 0, &ip_checkinterface, 0,
1750: CTL_NET, PF_INET, IPPROTO_IP,
1751: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1752: sysctl_createv(clog, 0, NULL, NULL,
1753: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1754: CTLTYPE_INT, "random_id",
1755: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1756: NULL, 0, &ip_do_randomid, 0,
1757: CTL_NET, PF_INET, IPPROTO_IP,
1758: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1759: sysctl_createv(clog, 0, NULL, NULL,
1760: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1761: CTLTYPE_INT, "do_loopback_cksum",
1762: SYSCTL_DESCR("Perform IP checksum on loopback"),
1763: NULL, 0, &ip_do_loopback_cksum, 0,
1764: CTL_NET, PF_INET, IPPROTO_IP,
1765: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1766: sysctl_createv(clog, 0, NULL, NULL,
1767: CTLFLAG_PERMANENT,
1768: CTLTYPE_STRUCT, "stats",
1769: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1770: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1771: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1772: CTL_EOL);
1.296.2.2 yamt 1773:
1774: /* anonportalgo RFC6056 subtree */
1775: const struct sysctlnode *portalgo_node;
1776: sysctl_createv(clog, 0, NULL, &portalgo_node,
1777: CTLFLAG_PERMANENT,
1778: CTLTYPE_NODE, "anonportalgo",
1779: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1780: NULL, 0, NULL, 0,
1781: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1782: sysctl_createv(clog, 0, &portalgo_node, NULL,
1783: CTLFLAG_PERMANENT,
1784: CTLTYPE_STRING, "available",
1785: SYSCTL_DESCR("available algorithms"),
1786: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1787: CTL_CREATE, CTL_EOL);
1788: sysctl_createv(clog, 0, &portalgo_node, NULL,
1789: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1790: CTLTYPE_STRING, "selected",
1791: SYSCTL_DESCR("selected algorithm"),
1.296.2.3 yamt 1792: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1793: CTL_CREATE, CTL_EOL);
1794: sysctl_createv(clog, 0, &portalgo_node, NULL,
1795: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1796: CTLTYPE_STRUCT, "reserve",
1797: SYSCTL_DESCR("bitmap of reserved ports"),
1798: sysctl_portalgo_reserve4, 0, NULL, 0,
1.296.2.2 yamt 1799: CTL_CREATE, CTL_EOL);
1.1 cgd 1800: }
1.266 thorpej 1801:
1802: void
1803: ip_statinc(u_int stat)
1804: {
1805:
1806: KASSERT(stat < IP_NSTATS);
1807: IP_STATINC(stat);
1808: }
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