Annotation of src/sys/netinet/ip_input.c, Revision 1.272.6.2
1.272.6.2! haad 1: /* $NetBSD: ip_input.c,v 1.276 2008/11/23 19:52:38 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>
1.272.6.2! haad 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.276 2008/11/23 19:52:38 rmind Exp $");
1.55 scottr 95:
1.184 jonathan 96: #include "opt_inet.h"
1.62 matt 97: #include "opt_gateway.h"
1.69 mrg 98: #include "opt_pfil_hooks.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/malloc.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:
1.27 thorpej 176: /*
177: * Note: DIRECTED_BROADCAST is handled this way so that previous
178: * configuration using this option will Just Work.
179: */
180: #ifndef IPDIRECTEDBCAST
181: #ifdef DIRECTED_BROADCAST
182: #define IPDIRECTEDBCAST 1
183: #else
184: #define IPDIRECTEDBCAST 0
185: #endif /* DIRECTED_BROADCAST */
186: #endif /* IPDIRECTEDBCAST */
1.1 cgd 187: int ipforwarding = IPFORWARDING;
188: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 189: int ip_defttl = IPDEFTTL;
1.26 thorpej 190: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 191: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 192: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 193: int ip_mtudisc = IPMTUDISC;
1.156 itojun 194: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 195: #ifdef DIAGNOSTIC
196: int ipprintfs = 0;
197: #endif
1.184 jonathan 198:
199: int ip_do_randomid = 0;
200:
1.165 christos 201: /*
202: * XXX - Setting ip_checkinterface mostly implements the receive side of
203: * the Strong ES model described in RFC 1122, but since the routing table
204: * and transmit implementation do not implement the Strong ES model,
205: * setting this to 1 results in an odd hybrid.
206: *
207: * XXX - ip_checkinterface currently must be disabled if you use ipnat
208: * to translate the destination address to another local interface.
209: *
210: * XXX - ip_checkinterface must be disabled if you add IP aliases
211: * to the loopback interface instead of the interface where the
212: * packets for those addresses are received.
213: */
214: int ip_checkinterface = 0;
215:
1.1 cgd 216:
1.60 kml 217: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
218:
1.1 cgd 219: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 220: u_long in_ifaddrhash; /* size of hash table - 1 */
221: int in_ifaddrentries; /* total number of addrs */
1.212 perry 222: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 223: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 224: u_long in_multihash; /* size of hash table - 1 */
225: int in_multientries; /* total number of addrs */
226: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 227: struct ifqueue ipintrq;
1.183 jonathan 228: uint16_t ip_id;
1.75 thorpej 229:
1.266 thorpej 230: percpu_t *ipstat_percpu;
231:
1.121 thorpej 232: #ifdef PFIL_HOOKS
233: struct pfil_head inet_pfil_hook;
234: #endif
235:
1.194 jonathan 236: /*
237: * Cached copy of nmbclusters. If nbclusters is different,
238: * recalculate IP parameters derived from nmbclusters.
239: */
240: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 241: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 242:
1.195 thorpej 243: #define CHECK_NMBCLUSTER_PARAMS() \
244: do { \
245: if (__predict_false(ip_nmbclusters != nmbclusters)) \
246: ip_nmbclusters_changed(); \
247: } while (/*CONSTCOND*/0)
1.194 jonathan 248:
1.190 jonathan 249: /* IP datagram reassembly queues (hashed) */
250: #define IPREASS_NHASH_LOG2 6
251: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
252: #define IPREASS_HMASK (IPREASS_NHASH - 1)
253: #define IPREASS_HASH(x,y) \
254: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
255: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 256: int ipq_locked;
1.212 perry 257: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 258: static int ip_nfrags; /* total fragments in reass queues */
259:
260: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
261: int ip_maxfrags; /* limit on fragments. XXX sysctl */
262:
263:
264: /*
265: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
266: * IP reassembly queue buffer managment.
1.212 perry 267: *
1.194 jonathan 268: * We keep a count of total IP fragments (NB: not fragmented packets!)
269: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
270: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
271: * total fragments in reassembly queues.This AIMD policy avoids
272: * repeatedly deleting single packets under heavy fragmentation load
273: * (e.g., from lossy NFS peers).
274: */
1.212 perry 275: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 276: static void ip_reass_drophalf(void);
1.194 jonathan 277:
1.75 thorpej 278:
1.223 perry 279: static inline int ipq_lock_try(void);
280: static inline void ipq_unlock(void);
1.75 thorpej 281:
1.223 perry 282: static inline int
1.211 perry 283: ipq_lock_try(void)
1.75 thorpej 284: {
285: int s;
286:
1.132 thorpej 287: /*
1.149 wiz 288: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 289: * mbuf allocation.
290: */
291: s = splvm();
1.75 thorpej 292: if (ipq_locked) {
293: splx(s);
294: return (0);
295: }
296: ipq_locked = 1;
297: splx(s);
298: return (1);
299: }
300:
1.223 perry 301: static inline void
1.211 perry 302: ipq_unlock(void)
1.75 thorpej 303: {
304: int s;
305:
1.132 thorpej 306: s = splvm();
1.75 thorpej 307: ipq_locked = 0;
308: splx(s);
309: }
310:
311: #ifdef DIAGNOSTIC
312: #define IPQ_LOCK() \
313: do { \
314: if (ipq_lock_try() == 0) { \
315: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
316: panic("ipq_lock"); \
317: } \
1.159 perry 318: } while (/*CONSTCOND*/ 0)
1.75 thorpej 319: #define IPQ_LOCK_CHECK() \
320: do { \
321: if (ipq_locked == 0) { \
322: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
323: panic("ipq lock check"); \
324: } \
1.159 perry 325: } while (/*CONSTCOND*/ 0)
1.75 thorpej 326: #else
327: #define IPQ_LOCK() (void) ipq_lock_try()
328: #define IPQ_LOCK_CHECK() /* nothing */
329: #endif
330:
331: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 332:
1.272.6.1 haad 333: struct pool inmulti_pool;
334: struct pool ipqent_pool;
1.72 thorpej 335:
1.135 thorpej 336: #ifdef INET_CSUM_COUNTERS
337: #include <sys/device.h>
338:
339: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
340: NULL, "inet", "hwcsum bad");
341: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
342: NULL, "inet", "hwcsum ok");
343: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
344: NULL, "inet", "swcsum");
345:
346: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
347:
1.201 matt 348: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
349: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
350: EVCNT_ATTACH_STATIC(ip_swcsum);
351:
1.135 thorpej 352: #else
353:
354: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
355:
356: #endif /* INET_CSUM_COUNTERS */
357:
1.1 cgd 358: /*
359: * We need to save the IP options in case a protocol wants to respond
360: * to an incoming packet over the same route if the packet got here
361: * using IP source routing. This allows connection establishment and
362: * maintenance when the remote end is on a network that is not known
363: * to us.
364: */
365: int ip_nhops = 0;
366: static struct ip_srcrt {
367: struct in_addr dst; /* final destination */
368: char nop; /* one NOP to align */
369: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
370: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
371: } ip_srcrt;
372:
1.210 perry 373: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 374:
1.164 matt 375: #ifdef MBUFTRACE
1.234 dogcow 376: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
377: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 378: #endif
379:
1.1 cgd 380: /*
1.194 jonathan 381: * Compute IP limits derived from the value of nmbclusters.
382: */
383: static void
384: ip_nmbclusters_changed(void)
385: {
386: ip_maxfrags = nmbclusters / 4;
387: ip_nmbclusters = nmbclusters;
388: }
389:
390: /*
1.1 cgd 391: * IP initialization: fill in IP protocol switch table.
392: * All protocols not implemented in kernel go to raw IP protocol handler.
393: */
1.8 mycroft 394: void
1.211 perry 395: ip_init(void)
1.1 cgd 396: {
1.199 matt 397: const struct protosw *pr;
1.109 augustss 398: int i;
1.1 cgd 399:
1.272.6.1 haad 400: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
401: NULL, IPL_SOFTNET);
402: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
403: NULL, IPL_VM);
404:
1.1 cgd 405: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
406: if (pr == 0)
407: panic("ip_init");
408: for (i = 0; i < IPPROTO_MAX; i++)
409: ip_protox[i] = pr - inetsw;
410: for (pr = inetdomain.dom_protosw;
411: pr < inetdomain.dom_protoswNPROTOSW; pr++)
412: if (pr->pr_domain->dom_family == PF_INET &&
413: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
414: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 415:
1.190 jonathan 416: for (i = 0; i < IPREASS_NHASH; i++)
417: LIST_INIT(&ipq[i]);
418:
1.262 matt 419: ip_initid();
1.227 kardel 420: ip_id = time_second & 0xfffff;
1.194 jonathan 421:
1.1 cgd 422: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 423: ip_nmbclusters_changed();
424:
1.181 jonathan 425: TAILQ_INIT(&in_ifaddrhead);
1.272 ad 426: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
427: &in_ifaddrhash);
428: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
429: &in_multihash);
1.160 itojun 430: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 431: #ifdef GATEWAY
1.248 liamjfoy 432: ipflow_init(ip_hashsize);
1.73 thorpej 433: #endif
1.121 thorpej 434:
435: #ifdef PFIL_HOOKS
436: /* Register our Packet Filter hook. */
1.126 thorpej 437: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
438: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 439: i = pfil_head_register(&inet_pfil_hook);
440: if (i != 0)
441: printf("ip_init: WARNING: unable to register pfil hook, "
442: "error %d\n", i);
443: #endif /* PFIL_HOOKS */
1.135 thorpej 444:
1.164 matt 445: #ifdef MBUFTRACE
446: MOWNER_ATTACH(&ip_tx_mowner);
447: MOWNER_ATTACH(&ip_rx_mowner);
448: #endif /* MBUFTRACE */
1.266 thorpej 449:
450: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 451: }
452:
1.229 christos 453: struct sockaddr_in ipaddr = {
454: .sin_len = sizeof(ipaddr),
455: .sin_family = AF_INET,
456: };
1.1 cgd 457: struct route ipforward_rt;
458:
459: /*
1.89 itojun 460: * IP software interrupt routine
461: */
462: void
1.211 perry 463: ipintr(void)
1.89 itojun 464: {
465: int s;
466: struct mbuf *m;
467:
1.268 ad 468: mutex_enter(softnet_lock);
469: KERNEL_LOCK(1, NULL);
1.241 ad 470: while (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 471: s = splnet();
1.89 itojun 472: IF_DEQUEUE(&ipintrq, m);
473: splx(s);
1.268 ad 474: if (m == NULL)
475: break;
1.89 itojun 476: ip_input(m);
477: }
1.268 ad 478: KERNEL_UNLOCK_ONE(NULL);
479: mutex_exit(softnet_lock);
1.89 itojun 480: }
481:
482: /*
1.1 cgd 483: * Ip input routine. Checksum and byte swap header. If fragmented
484: * try to reassemble. Process options. Pass to next level.
485: */
1.8 mycroft 486: void
1.89 itojun 487: ip_input(struct mbuf *m)
1.1 cgd 488: {
1.109 augustss 489: struct ip *ip = NULL;
490: struct ipq *fp;
491: struct in_ifaddr *ia;
492: struct ifaddr *ifa;
1.25 cgd 493: struct ipqent *ipqe;
1.89 itojun 494: int hlen = 0, mff, len;
1.100 itojun 495: int downmatch;
1.165 christos 496: int checkif;
1.169 itojun 497: int srcrt = 0;
1.233 tls 498: int s;
1.190 jonathan 499: u_int hash;
1.173 jonathan 500: #ifdef FAST_IPSEC
501: struct m_tag *mtag;
502: struct tdb_ident *tdbi;
503: struct secpolicy *sp;
1.233 tls 504: int error;
1.173 jonathan 505: #endif /* FAST_IPSEC */
1.1 cgd 506:
1.164 matt 507: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 508: #ifdef DIAGNOSTIC
509: if ((m->m_flags & M_PKTHDR) == 0)
510: panic("ipintr no HDR");
1.89 itojun 511: #endif
1.164 matt 512:
1.1 cgd 513: /*
514: * If no IP addresses have been set yet but the interfaces
515: * are receiving, can't do anything with incoming packets yet.
516: */
1.181 jonathan 517: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 518: goto bad;
1.266 thorpej 519: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 520: /*
521: * If the IP header is not aligned, slurp it up into a new
522: * mbuf with space for link headers, in the event we forward
523: * it. Otherwise, if it is aligned, make sure the entire
524: * base IP header is in the first mbuf of the chain.
525: */
1.244 christos 526: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 527: if ((m = m_copyup(m, sizeof(struct ip),
528: (max_linkhdr + 3) & ~3)) == NULL) {
529: /* XXXJRT new stat, please */
1.266 thorpej 530: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 531: return;
532: }
533: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
534: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 535: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 536: return;
537: }
1.1 cgd 538: }
539: ip = mtod(m, struct ip *);
1.13 mycroft 540: if (ip->ip_v != IPVERSION) {
1.266 thorpej 541: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 542: goto bad;
543: }
1.1 cgd 544: hlen = ip->ip_hl << 2;
545: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 546: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 547: goto bad;
548: }
549: if (hlen > m->m_len) {
550: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 551: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 552: return;
1.1 cgd 553: }
554: ip = mtod(m, struct ip *);
555: }
1.98 thorpej 556:
1.85 hwr 557: /*
1.99 thorpej 558: * RFC1122: packets with a multicast source address are
1.98 thorpej 559: * not allowed.
1.85 hwr 560: */
561: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 562: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 563: goto bad;
1.129 itojun 564: }
565:
566: /* 127/8 must not appear on wire - RFC1122 */
567: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
568: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 569: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 570: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 571: goto bad;
1.130 itojun 572: }
1.85 hwr 573: }
574:
1.135 thorpej 575: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 576: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 577: M_CSUM_IPv4_BAD)) {
578: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
579: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
580: goto badcsum;
581:
582: case M_CSUM_IPv4:
583: /* Checksum was okay. */
584: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
585: break;
586:
587: default:
1.206 thorpej 588: /*
589: * Must compute it ourselves. Maybe skip checksum on
590: * loopback interfaces.
591: */
592: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
593: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
594: INET_CSUM_COUNTER_INCR(&ip_swcsum);
595: if (in_cksum(m, hlen) != 0)
596: goto badcsum;
597: }
1.135 thorpej 598: break;
1.1 cgd 599: }
600:
1.121 thorpej 601: /* Retrieve the packet length. */
602: len = ntohs(ip->ip_len);
1.81 proff 603:
604: /*
605: * Check for additional length bogosity
606: */
1.84 proff 607: if (len < hlen) {
1.266 thorpej 608: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 609: goto bad;
610: }
1.1 cgd 611:
612: /*
613: * Check that the amount of data in the buffers
614: * is as at least much as the IP header would have us expect.
615: * Trim mbufs if longer than we expect.
616: * Drop packet if shorter than we expect.
617: */
1.35 mycroft 618: if (m->m_pkthdr.len < len) {
1.266 thorpej 619: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 620: goto bad;
621: }
1.35 mycroft 622: if (m->m_pkthdr.len > len) {
1.1 cgd 623: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 624: m->m_len = len;
625: m->m_pkthdr.len = len;
1.1 cgd 626: } else
1.35 mycroft 627: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 628: }
629:
1.193 scw 630: #if defined(IPSEC)
1.149 wiz 631: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 632: m->m_flags &= ~M_CANFASTFWD;
633: #else
1.64 thorpej 634: /*
635: * Assume that we can create a fast-forward IP flow entry
636: * based on this packet.
637: */
638: m->m_flags |= M_CANFASTFWD;
1.94 itojun 639: #endif
1.64 thorpej 640:
1.36 mrg 641: #ifdef PFIL_HOOKS
1.33 mrg 642: /*
1.64 thorpej 643: * Run through list of hooks for input packets. If there are any
644: * filters which require that additional packets in the flow are
645: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
646: * Note that filters must _never_ set this flag, as another filter
647: * in the list may have previously cleared it.
1.33 mrg 648: */
1.127 itojun 649: /*
650: * let ipfilter look at packet on the wire,
651: * not the decapsulated packet.
652: */
653: #ifdef IPSEC
1.136 itojun 654: if (!ipsec_getnhist(m))
1.186 scw 655: #elif defined(FAST_IPSEC)
656: if (!ipsec_indone(m))
1.127 itojun 657: #else
658: if (1)
659: #endif
660: {
1.169 itojun 661: struct in_addr odst;
662:
663: odst = ip->ip_dst;
1.127 itojun 664: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 665: PFIL_IN) != 0)
666: return;
1.127 itojun 667: if (m == NULL)
668: return;
669: ip = mtod(m, struct ip *);
1.142 darrenr 670: hlen = ip->ip_hl << 2;
1.205 darrenr 671: /*
672: * XXX The setting of "srcrt" here is to prevent ip_forward()
673: * from generating ICMP redirects for packets that have
674: * been redirected by a hook back out on to the same LAN that
675: * they came from and is not an indication that the packet
676: * is being inffluenced by source routing options. This
677: * allows things like
678: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
679: * where tlp0 is both on the 1.1.1.0/24 network and is the
680: * default route for hosts on 1.1.1.0/24. Of course this
681: * also requires a "map tlp0 ..." to complete the story.
682: * One might argue whether or not this kind of network config.
1.212 perry 683: * should be supported in this manner...
1.205 darrenr 684: */
1.169 itojun 685: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 686: }
1.36 mrg 687: #endif /* PFIL_HOOKS */
1.123 thorpej 688:
689: #ifdef ALTQ
690: /* XXX Temporary until ALTQ is changed to use a pfil hook */
691: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
692: /* packet dropped by traffic conditioner */
693: return;
694: }
695: #endif
1.121 thorpej 696:
697: /*
1.1 cgd 698: * Process options and, if not destined for us,
699: * ship it on. ip_dooptions returns 1 when an
700: * error was detected (causing an icmp message
701: * to be sent and the original packet to be freed).
702: */
703: ip_nhops = 0; /* for source routed packets */
704: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 705: return;
1.1 cgd 706:
707: /*
1.165 christos 708: * Enable a consistency check between the destination address
709: * and the arrival interface for a unicast packet (the RFC 1122
710: * strong ES model) if IP forwarding is disabled and the packet
711: * is not locally generated.
712: *
713: * XXX - Checking also should be disabled if the destination
714: * address is ipnat'ed to a different interface.
715: *
716: * XXX - Checking is incompatible with IP aliases added
717: * to the loopback interface instead of the interface where
718: * the packets are received.
719: *
720: * XXX - We need to add a per ifaddr flag for this so that
721: * we get finer grain control.
722: */
723: checkif = ip_checkinterface && (ipforwarding == 0) &&
724: (m->m_pkthdr.rcvif != NULL) &&
725: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
726:
727: /*
1.1 cgd 728: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 729: *
730: * Traditional 4.4BSD did not consult IFF_UP at all.
731: * The behavior here is to treat addresses on !IFF_UP interface
732: * as not mine.
1.1 cgd 733: */
1.100 itojun 734: downmatch = 0;
1.140 matt 735: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 736: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 737: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
738: continue;
1.97 itojun 739: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
740: break;
1.100 itojun 741: else
742: downmatch++;
1.97 itojun 743: }
744: }
1.86 thorpej 745: if (ia != NULL)
746: goto ours;
1.225 christos 747: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 748: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 749: if (ifa->ifa_addr->sa_family != AF_INET)
750: continue;
1.57 tls 751: ia = ifatoia(ifa);
1.35 mycroft 752: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
753: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 754: /*
755: * Look for all-0's host part (old broadcast addr),
756: * either for subnet or net.
757: */
758: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 759: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 760: goto ours;
1.57 tls 761: /*
762: * An interface with IP address zero accepts
763: * all packets that arrive on that interface.
764: */
765: if (in_nullhost(ia->ia_addr.sin_addr))
766: goto ours;
1.1 cgd 767: }
768: }
1.18 mycroft 769: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 770: struct in_multi *inm;
771: #ifdef MROUTING
772: extern struct socket *ip_mrouter;
1.10 brezak 773:
1.4 hpeyerl 774: if (ip_mrouter) {
775: /*
776: * If we are acting as a multicast router, all
777: * incoming multicast packets are passed to the
778: * kernel-level multicast forwarding function.
779: * The packet is returned (relatively) intact; if
780: * ip_mforward() returns a non-zero value, the packet
781: * must be discarded, else it may be accepted below.
782: *
783: * (The IP ident field is put in the same byte order
784: * as expected when ip_mforward() is called from
785: * ip_output().)
786: */
1.13 mycroft 787: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 788: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 789: m_freem(m);
1.89 itojun 790: return;
1.4 hpeyerl 791: }
792:
793: /*
794: * The process-level routing demon needs to receive
795: * all multicast IGMP packets, whether or not this
796: * host belongs to their destination groups.
797: */
798: if (ip->ip_p == IPPROTO_IGMP)
799: goto ours;
1.266 thorpej 800: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 801: }
802: #endif
803: /*
804: * See if we belong to the destination multicast group on the
805: * arrival interface.
806: */
807: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
808: if (inm == NULL) {
1.266 thorpej 809: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 810: m_freem(m);
1.89 itojun 811: return;
1.4 hpeyerl 812: }
813: goto ours;
814: }
1.19 mycroft 815: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 816: in_nullhost(ip->ip_dst))
1.1 cgd 817: goto ours;
818:
819: /*
820: * Not for us; forward if possible and desirable.
821: */
822: if (ipforwarding == 0) {
1.266 thorpej 823: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 824: m_freem(m);
1.100 itojun 825: } else {
826: /*
827: * If ip_dst matched any of my address on !IFF_UP interface,
828: * and there's no IFF_UP interface that matches ip_dst,
829: * send icmp unreach. Forwarding it will result in in-kernel
830: * forwarding loop till TTL goes to 0.
831: */
832: if (downmatch) {
833: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 834: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 835: return;
836: }
1.145 itojun 837: #ifdef IPSEC
838: if (ipsec4_in_reject(m, NULL)) {
1.267 thorpej 839: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 840: goto bad;
841: }
842: #endif
1.173 jonathan 843: #ifdef FAST_IPSEC
844: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
845: s = splsoftnet();
846: if (mtag != NULL) {
847: tdbi = (struct tdb_ident *)(mtag + 1);
848: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
849: } else {
850: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 851: IP_FORWARDING, &error);
1.173 jonathan 852: }
853: if (sp == NULL) { /* NB: can happen if error */
854: splx(s);
855: /*XXX error stat???*/
856: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
857: goto bad;
858: }
859:
860: /*
861: * Check security policy against packet attributes.
862: */
863: error = ipsec_in_reject(sp, m);
864: KEY_FREESP(&sp);
865: splx(s);
866: if (error) {
1.266 thorpej 867: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 868: goto bad;
1.193 scw 869: }
870:
871: /*
872: * Peek at the outbound SP for this packet to determine if
873: * it's a Fast Forward candidate.
874: */
875: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
876: if (mtag != NULL)
877: m->m_flags &= ~M_CANFASTFWD;
878: else {
879: s = splsoftnet();
880: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
881: (IP_FORWARDING |
882: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
883: &error, NULL);
884: if (sp != NULL) {
885: m->m_flags &= ~M_CANFASTFWD;
886: KEY_FREESP(&sp);
887: }
888: splx(s);
1.173 jonathan 889: }
890: #endif /* FAST_IPSEC */
1.145 itojun 891:
1.169 itojun 892: ip_forward(m, srcrt);
1.100 itojun 893: }
1.89 itojun 894: return;
1.1 cgd 895:
896: ours:
897: /*
898: * If offset or IP_MF are set, must reassemble.
899: * Otherwise, nothing need be done.
900: * (We could look in the reassembly queue to see
901: * if the packet was previously fragmented,
902: * but it's not worth the time; just let them time out.)
903: */
1.155 itojun 904: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258 matt 905: uint16_t off;
906: /*
907: * Prevent TCP blind data attacks by not allowing non-initial
908: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 909: * size) and making sure the first fragment is at least 68
910: * bytes.
1.258 matt 911: */
1.260 matt 912: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 913: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266 thorpej 914: IP_STATINC(IP_STAT_BADFRAGS);
1.258 matt 915: goto bad;
916: }
1.1 cgd 917: /*
918: * Look for queue of fragments
919: * of this datagram.
920: */
1.75 thorpej 921: IPQ_LOCK();
1.190 jonathan 922: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250 dyoung 923: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1 cgd 924: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 925: in_hosteq(ip->ip_src, fp->ipq_src) &&
926: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260 matt 927: ip->ip_p == fp->ipq_p) {
928: /*
929: * Make sure the TOS is matches previous
930: * fragments.
931: */
932: if (ip->ip_tos != fp->ipq_tos) {
1.266 thorpej 933: IP_STATINC(IP_STAT_BADFRAGS);
1.272.6.2! haad 934: IPQ_UNLOCK();
1.260 matt 935: goto bad;
936: }
1.1 cgd 937: goto found;
1.260 matt 938: }
1.190 jonathan 939: }
1.1 cgd 940: fp = 0;
941: found:
942:
943: /*
944: * Adjust ip_len to not reflect header,
1.25 cgd 945: * set ipqe_mff if more fragments are expected,
1.1 cgd 946: * convert offset of this to bytes.
947: */
1.155 itojun 948: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
949: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 950: if (mff) {
1.16 cgd 951: /*
952: * Make sure that fragments have a data length
953: * that's a non-zero multiple of 8 bytes.
954: */
1.155 itojun 955: if (ntohs(ip->ip_len) == 0 ||
956: (ntohs(ip->ip_len) & 0x7) != 0) {
1.266 thorpej 957: IP_STATINC(IP_STAT_BADFRAGS);
1.75 thorpej 958: IPQ_UNLOCK();
1.16 cgd 959: goto bad;
960: }
961: }
1.155 itojun 962: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 963:
964: /*
965: * If datagram marked as having more fragments
966: * or if this is not the first fragment,
967: * attempt reassembly; if it succeeds, proceed.
968: */
1.155 itojun 969: if (mff || ip->ip_off != htons(0)) {
1.266 thorpej 970: IP_STATINC(IP_STAT_FRAGMENTS);
1.233 tls 971: s = splvm();
1.72 thorpej 972: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 973: splx(s);
1.25 cgd 974: if (ipqe == NULL) {
1.266 thorpej 975: IP_STATINC(IP_STAT_RCVMEMDROP);
1.75 thorpej 976: IPQ_UNLOCK();
1.25 cgd 977: goto bad;
978: }
979: ipqe->ipqe_mff = mff;
1.50 thorpej 980: ipqe->ipqe_m = m;
1.25 cgd 981: ipqe->ipqe_ip = ip;
1.190 jonathan 982: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 983: if (m == 0) {
984: IPQ_UNLOCK();
1.89 itojun 985: return;
1.75 thorpej 986: }
1.266 thorpej 987: IP_STATINC(IP_STAT_REASSEMBLED);
1.50 thorpej 988: ip = mtod(m, struct ip *);
1.74 thorpej 989: hlen = ip->ip_hl << 2;
1.155 itojun 990: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 991: } else
992: if (fp)
993: ip_freef(fp);
1.75 thorpej 994: IPQ_UNLOCK();
1.79 mycroft 995: }
1.128 itojun 996:
1.173 jonathan 997: #if defined(IPSEC)
1.128 itojun 998: /*
999: * enforce IPsec policy checking if we are seeing last header.
1000: * note that we do not visit this with protocols with pcb layer
1001: * code - like udp/tcp/raw ip.
1002: */
1003: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
1004: ipsec4_in_reject(m, NULL)) {
1.267 thorpej 1005: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 1006: goto bad;
1007: }
1008: #endif
1.226 liamjfoy 1009: #ifdef FAST_IPSEC
1.173 jonathan 1010: /*
1011: * enforce IPsec policy checking if we are seeing last header.
1012: * note that we do not visit this with protocols with pcb layer
1013: * code - like udp/tcp/raw ip.
1014: */
1015: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1016: /*
1017: * Check if the packet has already had IPsec processing
1018: * done. If so, then just pass it along. This tag gets
1019: * set during AH, ESP, etc. input handling, before the
1020: * packet is returned to the ip input queue for delivery.
1.212 perry 1021: */
1.173 jonathan 1022: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1023: s = splsoftnet();
1024: if (mtag != NULL) {
1025: tdbi = (struct tdb_ident *)(mtag + 1);
1026: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1027: } else {
1028: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1029: IP_FORWARDING, &error);
1.173 jonathan 1030: }
1031: if (sp != NULL) {
1032: /*
1033: * Check security policy against packet attributes.
1034: */
1035: error = ipsec_in_reject(sp, m);
1036: KEY_FREESP(&sp);
1037: } else {
1038: /* XXX error stat??? */
1039: error = EINVAL;
1040: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1041: }
1042: splx(s);
1043: if (error)
1044: goto bad;
1045: }
1046: #endif /* FAST_IPSEC */
1.1 cgd 1047:
1048: /*
1049: * Switch out to protocol's input routine.
1050: */
1.82 aidan 1051: #if IFA_STATS
1.122 itojun 1052: if (ia && ip)
1.155 itojun 1053: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1054: #endif
1.266 thorpej 1055: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 1056: {
1057: int off = hlen, nh = ip->ip_p;
1058:
1059: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1060: return;
1061: }
1.1 cgd 1062: bad:
1063: m_freem(m);
1.135 thorpej 1064: return;
1065:
1066: badcsum:
1.266 thorpej 1067: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 1068: m_freem(m);
1.1 cgd 1069: }
1070:
1071: /*
1072: * Take incoming datagram fragment and try to
1073: * reassemble it into whole datagram. If a chain for
1074: * reassembly of this datagram already exists, then it
1075: * is given as fp; otherwise have to make a chain.
1076: */
1.50 thorpej 1077: struct mbuf *
1.211 perry 1078: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1079: {
1.109 augustss 1080: struct mbuf *m = ipqe->ipqe_m;
1081: struct ipqent *nq, *p, *q;
1.25 cgd 1082: struct ip *ip;
1.1 cgd 1083: struct mbuf *t;
1.25 cgd 1084: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1085: int i, next, s;
1.1 cgd 1086:
1.75 thorpej 1087: IPQ_LOCK_CHECK();
1088:
1.1 cgd 1089: /*
1090: * Presence of header sizes in mbufs
1091: * would confuse code below.
1092: */
1093: m->m_data += hlen;
1094: m->m_len -= hlen;
1095:
1.194 jonathan 1096: #ifdef notyet
1097: /* make sure fragment limit is up-to-date */
1098: CHECK_NMBCLUSTER_PARAMS();
1099:
1100: /* If we have too many fragments, drop the older half. */
1101: if (ip_nfrags >= ip_maxfrags)
1102: ip_reass_drophalf(void);
1103: #endif
1104:
1.1 cgd 1105: /*
1.192 jonathan 1106: * We are about to add a fragment; increment frag count.
1107: */
1108: ip_nfrags++;
1.212 perry 1109:
1.192 jonathan 1110: /*
1.1 cgd 1111: * If first fragment to arrive, create a reassembly queue.
1112: */
1113: if (fp == 0) {
1.131 itojun 1114: /*
1115: * Enforce upper bound on number of fragmented packets
1116: * for which we attempt reassembly;
1117: * If maxfrag is 0, never accept fragments.
1118: * If maxfrag is -1, accept all fragments without limitation.
1119: */
1120: if (ip_maxfragpackets < 0)
1121: ;
1122: else if (ip_nfragpackets >= ip_maxfragpackets)
1123: goto dropfrag;
1124: ip_nfragpackets++;
1.50 thorpej 1125: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1126: M_FTABLE, M_NOWAIT);
1127: if (fp == NULL)
1.1 cgd 1128: goto dropfrag;
1.190 jonathan 1129: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1130: fp->ipq_nfrags = 1;
1.1 cgd 1131: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1132: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1133: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260 matt 1134: fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148 matt 1135: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1136: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1137: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1138: p = NULL;
1.1 cgd 1139: goto insert;
1.192 jonathan 1140: } else {
1141: fp->ipq_nfrags++;
1.1 cgd 1142: }
1143:
1144: /*
1145: * Find a segment which begins after this one does.
1146: */
1.148 matt 1147: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1148: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1149: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1150: break;
1151:
1152: /*
1153: * If there is a preceding segment, it may provide some of
1154: * our data already. If so, drop the data from the incoming
1155: * segment. If it provides all of our data, drop us.
1156: */
1.25 cgd 1157: if (p != NULL) {
1.155 itojun 1158: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1159: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1160: if (i > 0) {
1.155 itojun 1161: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1162: goto dropfrag;
1.50 thorpej 1163: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1164: ipqe->ipqe_ip->ip_off =
1165: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1166: ipqe->ipqe_ip->ip_len =
1167: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1168: }
1169: }
1170:
1171: /*
1172: * While we overlap succeeding segments trim them or,
1173: * if they are completely covered, dequeue them.
1174: */
1.155 itojun 1175: for (; q != NULL &&
1176: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1177: ntohs(q->ipqe_ip->ip_off); q = nq) {
1178: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1179: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1180: if (i < ntohs(q->ipqe_ip->ip_len)) {
1181: q->ipqe_ip->ip_len =
1182: htons(ntohs(q->ipqe_ip->ip_len) - i);
1183: q->ipqe_ip->ip_off =
1184: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1185: m_adj(q->ipqe_m, i);
1.1 cgd 1186: break;
1187: }
1.148 matt 1188: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1189: m_freem(q->ipqe_m);
1.148 matt 1190: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1191: s = splvm();
1.72 thorpej 1192: pool_put(&ipqent_pool, q);
1.233 tls 1193: splx(s);
1.192 jonathan 1194: fp->ipq_nfrags--;
1195: ip_nfrags--;
1.1 cgd 1196: }
1197:
1198: insert:
1199: /*
1200: * Stick new segment in its place;
1201: * check for complete reassembly.
1202: */
1.25 cgd 1203: if (p == NULL) {
1.148 matt 1204: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1205: } else {
1.148 matt 1206: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1207: }
1.1 cgd 1208: next = 0;
1.148 matt 1209: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1210: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1211: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1212: return (0);
1.155 itojun 1213: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1214: }
1.25 cgd 1215: if (p->ipqe_mff)
1.1 cgd 1216: return (0);
1217:
1218: /*
1.41 thorpej 1219: * Reassembly is complete. Check for a bogus message size and
1220: * concatenate fragments.
1.1 cgd 1221: */
1.148 matt 1222: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1223: ip = q->ipqe_ip;
1.41 thorpej 1224: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266 thorpej 1225: IP_STATINC(IP_STAT_TOOLONG);
1.41 thorpej 1226: ip_freef(fp);
1227: return (0);
1228: }
1.50 thorpej 1229: m = q->ipqe_m;
1.1 cgd 1230: t = m->m_next;
1231: m->m_next = 0;
1232: m_cat(m, t);
1.148 matt 1233: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1234: s = splvm();
1.72 thorpej 1235: pool_put(&ipqent_pool, q);
1.233 tls 1236: splx(s);
1.25 cgd 1237: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1238: t = q->ipqe_m;
1.148 matt 1239: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1240: s = splvm();
1.72 thorpej 1241: pool_put(&ipqent_pool, q);
1.233 tls 1242: splx(s);
1.1 cgd 1243: m_cat(m, t);
1244: }
1.192 jonathan 1245: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1246:
1247: /*
1248: * Create header for new ip packet by
1249: * modifying header of first packet;
1250: * dequeue and discard fragment reassembly header.
1251: * Make header visible.
1252: */
1.155 itojun 1253: ip->ip_len = htons(next);
1.25 cgd 1254: ip->ip_src = fp->ipq_src;
1255: ip->ip_dst = fp->ipq_dst;
1256: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1257: FREE(fp, M_FTABLE);
1.131 itojun 1258: ip_nfragpackets--;
1.1 cgd 1259: m->m_len += (ip->ip_hl << 2);
1260: m->m_data -= (ip->ip_hl << 2);
1261: /* some debugging cruft by sklower, below, will go away soon */
1262: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1263: int plen = 0;
1.50 thorpej 1264: for (t = m; t; t = t->m_next)
1265: plen += t->m_len;
1266: m->m_pkthdr.len = plen;
1.213 yamt 1267: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1268: }
1.50 thorpej 1269: return (m);
1.1 cgd 1270:
1271: dropfrag:
1.192 jonathan 1272: if (fp != 0)
1273: fp->ipq_nfrags--;
1274: ip_nfrags--;
1.266 thorpej 1275: IP_STATINC(IP_STAT_FRAGDROPPED);
1.1 cgd 1276: m_freem(m);
1.233 tls 1277: s = splvm();
1.72 thorpej 1278: pool_put(&ipqent_pool, ipqe);
1.233 tls 1279: splx(s);
1.1 cgd 1280: return (0);
1281: }
1282:
1283: /*
1284: * Free a fragment reassembly header and all
1285: * associated datagrams.
1286: */
1.8 mycroft 1287: void
1.211 perry 1288: ip_freef(struct ipq *fp)
1.1 cgd 1289: {
1.109 augustss 1290: struct ipqent *q, *p;
1.192 jonathan 1291: u_int nfrags = 0;
1.233 tls 1292: int s;
1.1 cgd 1293:
1.75 thorpej 1294: IPQ_LOCK_CHECK();
1295:
1.148 matt 1296: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1297: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1298: m_freem(q->ipqe_m);
1.192 jonathan 1299: nfrags++;
1.148 matt 1300: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1301: s = splvm();
1.72 thorpej 1302: pool_put(&ipqent_pool, q);
1.233 tls 1303: splx(s);
1.1 cgd 1304: }
1.192 jonathan 1305:
1306: if (nfrags != fp->ipq_nfrags)
1307: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1308: ip_nfrags -= nfrags;
1.25 cgd 1309: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1310: FREE(fp, M_FTABLE);
1.131 itojun 1311: ip_nfragpackets--;
1.1 cgd 1312: }
1313:
1314: /*
1.194 jonathan 1315: * IP reassembly TTL machinery for multiplicative drop.
1316: */
1317: static u_int fragttl_histo[(IPFRAGTTL+1)];
1318:
1319:
1320: /*
1321: * Decrement TTL of all reasembly queue entries by `ticks'.
1322: * Count number of distinct fragments (as opposed to partial, fragmented
1323: * datagrams) in the reassembly queue. While we traverse the entire
1324: * reassembly queue, compute and return the median TTL over all fragments.
1325: */
1326: static u_int
1327: ip_reass_ttl_decr(u_int ticks)
1328: {
1.198 matt 1329: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1330: struct ipq *fp, *nfp;
1.198 matt 1331: int i;
1.212 perry 1332:
1.194 jonathan 1333: nfrags = 0;
1334: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1335:
1.194 jonathan 1336: for (i = 0; i < IPREASS_NHASH; i++) {
1337: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1338: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1339: 0 : fp->ipq_ttl - ticks);
1340: nfp = LIST_NEXT(fp, ipq_q);
1341: if (fp->ipq_ttl == 0) {
1.266 thorpej 1342: IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194 jonathan 1343: ip_freef(fp);
1344: } else {
1345: nfrags += fp->ipq_nfrags;
1346: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1347: }
1348: }
1349: }
1350:
1351: KASSERT(ip_nfrags == nfrags);
1352:
1353: /* Find median (or other drop fraction) in histogram. */
1354: dropfraction = (ip_nfrags / 2);
1355: keepfraction = ip_nfrags - dropfraction;
1356: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1357: median += fragttl_histo[i];
1358: if (median >= keepfraction)
1359: break;
1360: }
1361:
1362: /* Return TTL of median (or other fraction). */
1363: return (u_int)i;
1364: }
1365:
1366: void
1367: ip_reass_drophalf(void)
1368: {
1369:
1370: u_int median_ticks;
1371: /*
1372: * Compute median TTL of all fragments, and count frags
1373: * with that TTL or lower (roughly half of all fragments).
1374: */
1375: median_ticks = ip_reass_ttl_decr(0);
1376:
1377: /* Drop half. */
1378: median_ticks = ip_reass_ttl_decr(median_ticks);
1379:
1380: }
1381:
1382: /*
1.1 cgd 1383: * IP timer processing;
1384: * if a timer expires on a reassembly
1385: * queue, discard it.
1386: */
1.8 mycroft 1387: void
1.211 perry 1388: ip_slowtimo(void)
1.1 cgd 1389: {
1.191 jonathan 1390: static u_int dropscanidx = 0;
1391: u_int i;
1.194 jonathan 1392: u_int median_ttl;
1.268 ad 1393:
1394: mutex_enter(softnet_lock);
1395: KERNEL_LOCK(1, NULL);
1.1 cgd 1396:
1.75 thorpej 1397: IPQ_LOCK();
1.194 jonathan 1398:
1399: /* Age TTL of all fragments by 1 tick .*/
1400: median_ttl = ip_reass_ttl_decr(1);
1401:
1402: /* make sure fragment limit is up-to-date */
1403: CHECK_NMBCLUSTER_PARAMS();
1404:
1405: /* If we have too many fragments, drop the older half. */
1406: if (ip_nfrags > ip_maxfrags)
1407: ip_reass_ttl_decr(median_ttl);
1408:
1.131 itojun 1409: /*
1.194 jonathan 1410: * If we are over the maximum number of fragmented packets
1.131 itojun 1411: * (due to the limit being lowered), drain off
1.190 jonathan 1412: * enough to get down to the new limit. Start draining
1413: * from the reassembly hashqueue most recently drained.
1.131 itojun 1414: */
1415: if (ip_maxfragpackets < 0)
1416: ;
1417: else {
1.190 jonathan 1418: int wrapped = 0;
1419:
1420: i = dropscanidx;
1421: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1422: while (LIST_FIRST(&ipq[i]) != NULL)
1423: ip_freef(LIST_FIRST(&ipq[i]));
1424: if (++i >= IPREASS_NHASH) {
1425: i = 0;
1426: }
1427: /*
1428: * Dont scan forever even if fragment counters are
1429: * wrong: stop after scanning entire reassembly queue.
1430: */
1431: if (i == dropscanidx)
1432: wrapped = 1;
1433: }
1434: dropscanidx = i;
1.131 itojun 1435: }
1.75 thorpej 1436: IPQ_UNLOCK();
1.268 ad 1437:
1438: KERNEL_UNLOCK_ONE(NULL);
1439: mutex_exit(softnet_lock);
1.1 cgd 1440: }
1441:
1442: /*
1.270 ad 1443: * Drain off all datagram fragments. Don't acquire softnet_lock as
1444: * can be called from hardware interrupt context.
1.1 cgd 1445: */
1.8 mycroft 1446: void
1.211 perry 1447: ip_drain(void)
1.1 cgd 1448: {
1449:
1.268 ad 1450: KERNEL_LOCK(1, NULL);
1451:
1.75 thorpej 1452: /*
1453: * We may be called from a device's interrupt context. If
1454: * the ipq is already busy, just bail out now.
1455: */
1.268 ad 1456: if (ipq_lock_try() != 0) {
1457: /*
1458: * Drop half the total fragments now. If more mbufs are
1459: * needed, we will be called again soon.
1460: */
1461: ip_reass_drophalf();
1462: IPQ_UNLOCK();
1463: }
1.75 thorpej 1464:
1.268 ad 1465: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 1466: }
1467:
1468: /*
1469: * Do option processing on a datagram,
1470: * possibly discarding it if bad options are encountered,
1471: * or forwarding it if source-routed.
1472: * Returns 1 if packet has been forwarded/freed,
1473: * 0 if the packet should be processed further.
1474: */
1.8 mycroft 1475: int
1.211 perry 1476: ip_dooptions(struct mbuf *m)
1.1 cgd 1477: {
1.109 augustss 1478: struct ip *ip = mtod(m, struct ip *);
1479: u_char *cp, *cp0;
1480: struct ip_timestamp *ipt;
1481: struct in_ifaddr *ia;
1.1 cgd 1482: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1483: struct in_addr dst;
1.1 cgd 1484: n_time ntime;
1485:
1.13 mycroft 1486: dst = ip->ip_dst;
1.1 cgd 1487: cp = (u_char *)(ip + 1);
1488: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1489: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1490: opt = cp[IPOPT_OPTVAL];
1491: if (opt == IPOPT_EOL)
1492: break;
1493: if (opt == IPOPT_NOP)
1494: optlen = 1;
1495: else {
1.113 itojun 1496: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1497: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1498: goto bad;
1499: }
1.1 cgd 1500: optlen = cp[IPOPT_OLEN];
1.114 itojun 1501: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1502: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1503: goto bad;
1504: }
1505: }
1506: switch (opt) {
1507:
1508: default:
1509: break;
1510:
1511: /*
1512: * Source routing with record.
1513: * Find interface with current destination address.
1514: * If none on this machine then drop if strictly routed,
1515: * or do nothing if loosely routed.
1516: * Record interface address and bring up next address
1517: * component. If strictly routed make sure next
1518: * address is on directly accessible net.
1519: */
1520: case IPOPT_LSRR:
1521: case IPOPT_SSRR:
1.47 cjs 1522: if (ip_allowsrcrt == 0) {
1523: type = ICMP_UNREACH;
1524: code = ICMP_UNREACH_NET_PROHIB;
1525: goto bad;
1526: }
1.114 itojun 1527: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1528: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1529: goto bad;
1530: }
1.1 cgd 1531: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1532: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1533: goto bad;
1534: }
1535: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1536: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1537: if (ia == 0) {
1538: if (opt == IPOPT_SSRR) {
1539: type = ICMP_UNREACH;
1540: code = ICMP_UNREACH_SRCFAIL;
1541: goto bad;
1542: }
1543: /*
1544: * Loose routing, and not at next destination
1545: * yet; nothing to do except forward.
1546: */
1547: break;
1548: }
1549: off--; /* 0 origin */
1.112 sommerfe 1550: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1551: /*
1552: * End of source route. Should be for us.
1553: */
1554: save_rte(cp, ip->ip_src);
1555: break;
1556: }
1557: /*
1558: * locate outgoing interface
1559: */
1.244 christos 1560: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1 cgd 1561: sizeof(ipaddr.sin_addr));
1.96 thorpej 1562: if (opt == IPOPT_SSRR)
1.196 itojun 1563: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1564: else
1.1 cgd 1565: ia = ip_rtaddr(ipaddr.sin_addr);
1566: if (ia == 0) {
1567: type = ICMP_UNREACH;
1568: code = ICMP_UNREACH_SRCFAIL;
1569: goto bad;
1570: }
1571: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1572: bcopy((void *)&ia->ia_addr.sin_addr,
1573: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1574: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1575: /*
1576: * Let ip_intr's mcast routing check handle mcast pkts
1577: */
1.18 mycroft 1578: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1579: break;
1580:
1581: case IPOPT_RR:
1.114 itojun 1582: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1583: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1584: goto bad;
1585: }
1.1 cgd 1586: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1587: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1588: goto bad;
1589: }
1590: /*
1591: * If no space remains, ignore.
1592: */
1593: off--; /* 0 origin */
1.112 sommerfe 1594: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1595: break;
1.244 christos 1596: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1 cgd 1597: sizeof(ipaddr.sin_addr));
1598: /*
1599: * locate outgoing interface; if we're the destination,
1600: * use the incoming interface (should be same).
1601: */
1.96 thorpej 1602: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1603: == NULL &&
1604: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1605: type = ICMP_UNREACH;
1606: code = ICMP_UNREACH_HOST;
1607: goto bad;
1608: }
1.244 christos 1609: bcopy((void *)&ia->ia_addr.sin_addr,
1610: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1611: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1612: break;
1613:
1614: case IPOPT_TS:
1615: code = cp - (u_char *)ip;
1616: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1617: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1618: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1619: goto bad;
1.114 itojun 1620: }
1621: if (ipt->ipt_ptr < 5) {
1622: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1623: goto bad;
1624: }
1.15 cgd 1625: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1626: if (++ipt->ipt_oflw == 0) {
1627: code = (u_char *)&ipt->ipt_ptr -
1628: (u_char *)ip;
1.1 cgd 1629: goto bad;
1.114 itojun 1630: }
1.1 cgd 1631: break;
1632: }
1.104 thorpej 1633: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1634: switch (ipt->ipt_flg) {
1635:
1636: case IPOPT_TS_TSONLY:
1637: break;
1638:
1639: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1640: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1641: sizeof(struct in_addr) > ipt->ipt_len) {
1642: code = (u_char *)&ipt->ipt_ptr -
1643: (u_char *)ip;
1.1 cgd 1644: goto bad;
1.114 itojun 1645: }
1.13 mycroft 1646: ipaddr.sin_addr = dst;
1.96 thorpej 1647: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1648: m->m_pkthdr.rcvif));
1.13 mycroft 1649: if (ia == 0)
1650: continue;
1.104 thorpej 1651: bcopy(&ia->ia_addr.sin_addr,
1652: cp0, sizeof(struct in_addr));
1.1 cgd 1653: ipt->ipt_ptr += sizeof(struct in_addr);
1654: break;
1655:
1656: case IPOPT_TS_PRESPEC:
1.66 thorpej 1657: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1658: sizeof(struct in_addr) > ipt->ipt_len) {
1659: code = (u_char *)&ipt->ipt_ptr -
1660: (u_char *)ip;
1.1 cgd 1661: goto bad;
1.114 itojun 1662: }
1.104 thorpej 1663: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1664: sizeof(struct in_addr));
1.96 thorpej 1665: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1666: == NULL)
1.1 cgd 1667: continue;
1668: ipt->ipt_ptr += sizeof(struct in_addr);
1669: break;
1670:
1671: default:
1.114 itojun 1672: /* XXX can't take &ipt->ipt_flg */
1673: code = (u_char *)&ipt->ipt_ptr -
1674: (u_char *)ip + 1;
1.1 cgd 1675: goto bad;
1676: }
1677: ntime = iptime();
1.107 thorpej 1678: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1679: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1680: sizeof(n_time));
1681: ipt->ipt_ptr += sizeof(n_time);
1682: }
1683: }
1684: if (forward) {
1.26 thorpej 1685: if (ip_forwsrcrt == 0) {
1686: type = ICMP_UNREACH;
1687: code = ICMP_UNREACH_SRCFAIL;
1688: goto bad;
1689: }
1.1 cgd 1690: ip_forward(m, 1);
1691: return (1);
1.13 mycroft 1692: }
1693: return (0);
1.1 cgd 1694: bad:
1.13 mycroft 1695: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1696: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1697: return (1);
1698: }
1699:
1700: /*
1701: * Given address of next destination (final or next hop),
1702: * return internet address info of interface to be used to get there.
1703: */
1704: struct in_ifaddr *
1.211 perry 1705: ip_rtaddr(struct in_addr dst)
1.1 cgd 1706: {
1.249 dyoung 1707: struct rtentry *rt;
1708: union {
1709: struct sockaddr dst;
1710: struct sockaddr_in dst4;
1711: } u;
1712:
1713: sockaddr_in_init(&u.dst4, &dst, 0);
1714:
1715: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1716: return NULL;
1717:
1718: return ifatoia(rt->rt_ifa);
1.1 cgd 1719: }
1720:
1721: /*
1722: * Save incoming source route for use in replies,
1723: * to be picked up later by ip_srcroute if the receiver is interested.
1724: */
1.13 mycroft 1725: void
1.211 perry 1726: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1727: {
1728: unsigned olen;
1729:
1730: olen = option[IPOPT_OLEN];
1731: #ifdef DIAGNOSTIC
1732: if (ipprintfs)
1.39 christos 1733: printf("save_rte: olen %d\n", olen);
1.89 itojun 1734: #endif /* 0 */
1.1 cgd 1735: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1736: return;
1.244 christos 1737: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1 cgd 1738: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1739: ip_srcrt.dst = dst;
1740: }
1741:
1742: /*
1743: * Retrieve incoming source route for use in replies,
1744: * in the same form used by setsockopt.
1745: * The first hop is placed before the options, will be removed later.
1746: */
1747: struct mbuf *
1.211 perry 1748: ip_srcroute(void)
1.1 cgd 1749: {
1.109 augustss 1750: struct in_addr *p, *q;
1751: struct mbuf *m;
1.1 cgd 1752:
1753: if (ip_nhops == 0)
1.237 dyoung 1754: return NULL;
1.1 cgd 1755: m = m_get(M_DONTWAIT, MT_SOOPTS);
1756: if (m == 0)
1.237 dyoung 1757: return NULL;
1.1 cgd 1758:
1.164 matt 1759: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1760: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1761:
1762: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1763: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1764: OPTSIZ;
1765: #ifdef DIAGNOSTIC
1766: if (ipprintfs)
1.39 christos 1767: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1768: #endif
1769:
1770: /*
1771: * First save first hop for return route
1772: */
1773: p = &ip_srcrt.route[ip_nhops - 1];
1774: *(mtod(m, struct in_addr *)) = *p--;
1775: #ifdef DIAGNOSTIC
1776: if (ipprintfs)
1.39 christos 1777: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1778: #endif
1779:
1780: /*
1781: * Copy option fields and padding (nop) to mbuf.
1782: */
1783: ip_srcrt.nop = IPOPT_NOP;
1784: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1785: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1786: OPTSIZ);
1787: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1788: sizeof(struct in_addr) + OPTSIZ);
1789: #undef OPTSIZ
1790: /*
1791: * Record return path as an IP source route,
1792: * reversing the path (pointers are now aligned).
1793: */
1794: while (p >= ip_srcrt.route) {
1795: #ifdef DIAGNOSTIC
1796: if (ipprintfs)
1.39 christos 1797: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1798: #endif
1799: *q++ = *p--;
1800: }
1801: /*
1802: * Last hop goes to final destination.
1803: */
1804: *q = ip_srcrt.dst;
1805: #ifdef DIAGNOSTIC
1806: if (ipprintfs)
1.39 christos 1807: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1808: #endif
1809: return (m);
1810: }
1811:
1.139 matt 1812: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1813: [PRC_MSGSIZE] = EMSGSIZE,
1814: [PRC_HOSTDEAD] = EHOSTDOWN,
1815: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1816: [PRC_UNREACH_NET] = EHOSTUNREACH,
1817: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1818: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1819: [PRC_UNREACH_PORT] = ECONNREFUSED,
1820: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1821: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1822: };
1823:
1824: /*
1825: * Forward a packet. If some error occurs return the sender
1826: * an icmp packet. Note we can't always generate a meaningful
1827: * icmp message because icmp doesn't have a large enough repertoire
1828: * of codes and types.
1829: *
1830: * If not forwarding, just drop the packet. This could be confusing
1831: * if ipforwarding was zero but some routing protocol was advancing
1832: * us as a gateway to somewhere. However, we must let the routing
1833: * protocol deal with that.
1834: *
1835: * The srcrt parameter indicates whether the packet is being forwarded
1836: * via a source route.
1837: */
1.13 mycroft 1838: void
1.211 perry 1839: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1840: {
1.109 augustss 1841: struct ip *ip = mtod(m, struct ip *);
1842: struct rtentry *rt;
1.220 christos 1843: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1844: struct mbuf *mcopy;
1.13 mycroft 1845: n_long dest;
1.249 dyoung 1846: union {
1847: struct sockaddr dst;
1848: struct sockaddr_in dst4;
1849: } u;
1.164 matt 1850:
1851: /*
1852: * We are now in the output path.
1853: */
1854: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1855:
1856: /*
1857: * Clear any in-bound checksum flags for this packet.
1858: */
1859: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1860:
1.13 mycroft 1861: dest = 0;
1.1 cgd 1862: #ifdef DIAGNOSTIC
1.224 joerg 1863: if (ipprintfs) {
1864: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1865: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1866: }
1.1 cgd 1867: #endif
1.93 sommerfe 1868: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1869: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1870: m_freem(m);
1871: return;
1872: }
1873: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1874: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1875: return;
1876: }
1877:
1.249 dyoung 1878: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1879: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1880: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1881: return;
1.1 cgd 1882: }
1883:
1884: /*
1.34 mycroft 1885: * Save at most 68 bytes of the packet in case
1.1 cgd 1886: * we need to generate an ICMP message to the src.
1.119 itojun 1887: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1888: */
1.155 itojun 1889: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1890: if (mcopy)
1891: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1892:
1.221 christos 1893: ip->ip_ttl -= IPTTLDEC;
1894:
1.1 cgd 1895: /*
1896: * If forwarding packet using same interface that it came in on,
1897: * perhaps should send a redirect to sender to shortcut a hop.
1898: * Only send redirect if source is sending directly to us,
1899: * and if packet was not source routed (or has any options).
1900: * Also, don't send redirect if forwarding using a default route
1901: * or a route modified by a redirect.
1902: */
1903: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1904: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1905: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1906: ipsendredirects && !srcrt) {
1.19 mycroft 1907: if (rt->rt_ifa &&
1908: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1909: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1910: if (rt->rt_flags & RTF_GATEWAY)
1911: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1912: else
1913: dest = ip->ip_dst.s_addr;
1914: /*
1915: * Router requirements says to only send host
1916: * redirects.
1917: */
1918: type = ICMP_REDIRECT;
1919: code = ICMP_REDIRECT_HOST;
1.1 cgd 1920: #ifdef DIAGNOSTIC
1.77 thorpej 1921: if (ipprintfs)
1922: printf("redirect (%d) to %x\n", code,
1923: (u_int32_t)dest);
1.1 cgd 1924: #endif
1925: }
1926: }
1927:
1.238 dyoung 1928: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1929: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1930: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1931:
1.1 cgd 1932: if (error)
1.266 thorpej 1933: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1934: else {
1.266 thorpej 1935: uint64_t *ips = IP_STAT_GETREF();
1936: ips[IP_STAT_FORWARD]++;
1937: if (type) {
1938: ips[IP_STAT_REDIRECTSENT]++;
1939: IP_STAT_PUTREF();
1940: } else {
1941: IP_STAT_PUTREF();
1.63 matt 1942: if (mcopy) {
1943: #ifdef GATEWAY
1.64 thorpej 1944: if (mcopy->m_flags & M_CANFASTFWD)
1945: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1946: #endif
1.1 cgd 1947: m_freem(mcopy);
1.63 matt 1948: }
1.1 cgd 1949: return;
1950: }
1951: }
1952: if (mcopy == NULL)
1953: return;
1.13 mycroft 1954:
1.1 cgd 1955: switch (error) {
1956:
1957: case 0: /* forwarded, but need redirect */
1958: /* type, code set above */
1959: break;
1960:
1961: case ENETUNREACH: /* shouldn't happen, checked above */
1962: case EHOSTUNREACH:
1963: case ENETDOWN:
1964: case EHOSTDOWN:
1965: default:
1966: type = ICMP_UNREACH;
1967: code = ICMP_UNREACH_HOST;
1968: break;
1969:
1970: case EMSGSIZE:
1971: type = ICMP_UNREACH;
1972: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1973:
1.272.6.1 haad 1974: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1975: destmtu = rt->rt_ifp->if_mtu;
1.263 cube 1976:
1977: #if defined(IPSEC) || defined(FAST_IPSEC)
1.272.6.1 haad 1978: {
1.263 cube 1979: /*
1980: * If the packet is routed over IPsec tunnel, tell the
1981: * originator the tunnel MTU.
1982: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1983: * XXX quickhack!!!
1984: */
1985:
1.89 itojun 1986: struct secpolicy *sp;
1987: int ipsecerror;
1.95 itojun 1988: size_t ipsechdr;
1.89 itojun 1989: struct route *ro;
1990:
1991: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1992: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1993: &ipsecerror);
1.89 itojun 1994:
1.263 cube 1995: if (sp != NULL) {
1.89 itojun 1996: /* count IPsec header size */
1.95 itojun 1997: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1998: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1999:
2000: /*
2001: * find the correct route for outer IPv4
2002: * header, compute tunnel MTU.
2003: */
1.220 christos 2004:
1.89 itojun 2005: if (sp->req != NULL
1.95 itojun 2006: && sp->req->sav != NULL
2007: && sp->req->sav->sah != NULL) {
2008: ro = &sp->req->sav->sah->sa_route;
1.272.6.1 haad 2009: rt = rtcache_validate(ro);
1.257 dyoung 2010: if (rt && rt->rt_ifp) {
1.220 christos 2011: destmtu =
1.257 dyoung 2012: rt->rt_rmx.rmx_mtu ?
2013: rt->rt_rmx.rmx_mtu :
2014: rt->rt_ifp->if_mtu;
1.220 christos 2015: destmtu -= ipsechdr;
1.89 itojun 2016: }
2017: }
2018:
1.173 jonathan 2019: #ifdef IPSEC
1.89 itojun 2020: key_freesp(sp);
1.173 jonathan 2021: #else
2022: KEY_FREESP(&sp);
2023: #endif
1.89 itojun 2024: }
2025: }
1.272.6.1 haad 2026: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266 thorpej 2027: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 2028: break;
2029:
2030: case ENOBUFS:
1.143 itojun 2031: #if 1
2032: /*
2033: * a router should not generate ICMP_SOURCEQUENCH as
2034: * required in RFC1812 Requirements for IP Version 4 Routers.
2035: * source quench could be a big problem under DoS attacks,
1.149 wiz 2036: * or if the underlying interface is rate-limited.
1.143 itojun 2037: */
2038: if (mcopy)
2039: m_freem(mcopy);
2040: return;
2041: #else
1.1 cgd 2042: type = ICMP_SOURCEQUENCH;
2043: code = 0;
2044: break;
1.143 itojun 2045: #endif
1.1 cgd 2046: }
1.220 christos 2047: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2048: }
2049:
2050: void
1.211 perry 2051: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2052: struct mbuf *m)
1.44 thorpej 2053: {
2054:
2055: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2056: struct timeval tv;
2057:
2058: microtime(&tv);
1.244 christos 2059: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2060: SCM_TIMESTAMP, SOL_SOCKET);
2061: if (*mp)
2062: mp = &(*mp)->m_next;
2063: }
2064: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2065: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2066: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2067: if (*mp)
2068: mp = &(*mp)->m_next;
2069: }
2070: #ifdef notyet
2071: /*
2072: * XXX
2073: * Moving these out of udp_input() made them even more broken
2074: * than they already were.
2075: * - fenner@parc.xerox.com
2076: */
2077: /* options were tossed already */
2078: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2079: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2080: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2081: if (*mp)
2082: mp = &(*mp)->m_next;
2083: }
2084: /* ip_srcroute doesn't do what we want here, need to fix */
2085: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2086: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2087: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2088: if (*mp)
2089: mp = &(*mp)->m_next;
2090: }
2091: #endif
2092: if (inp->inp_flags & INP_RECVIF) {
2093: struct sockaddr_dl sdl;
2094:
1.252 dyoung 2095: sockaddr_dl_init(&sdl, sizeof(sdl),
2096: (m->m_pkthdr.rcvif != NULL)
2097: ? m->m_pkthdr.rcvif->if_index
2098: : 0,
2099: 0, NULL, 0, NULL, 0);
1.251 dyoung 2100: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2101: if (*mp)
2102: mp = &(*mp)->m_next;
2103: }
1.13 mycroft 2104: }
2105:
1.189 atatat 2106: /*
1.228 elad 2107: * sysctl helper routine for net.inet.ip.forwsrcrt.
2108: */
2109: static int
2110: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2111: {
2112: int error, tmp;
2113: struct sysctlnode node;
2114:
2115: node = *rnode;
2116: tmp = ip_forwsrcrt;
2117: node.sysctl_data = &tmp;
2118: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2119: if (error || newp == NULL)
2120: return (error);
2121:
1.230 elad 2122: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232 elad 2123: 0, NULL, NULL, NULL))
1.228 elad 2124: return (EPERM);
2125:
2126: ip_forwsrcrt = tmp;
2127:
2128: return (0);
2129: }
2130:
2131: /*
1.189 atatat 2132: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2133: * range of the new value and tweaks timers if it changes.
2134: */
2135: static int
2136: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2137: {
1.189 atatat 2138: int error, tmp;
2139: struct sysctlnode node;
2140:
2141: node = *rnode;
2142: tmp = ip_mtudisc_timeout;
2143: node.sysctl_data = &tmp;
2144: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2145: if (error || newp == NULL)
2146: return (error);
2147: if (tmp < 0)
2148: return (EINVAL);
1.52 thorpej 2149:
1.272.6.1 haad 2150: mutex_enter(softnet_lock);
2151:
1.189 atatat 2152: ip_mtudisc_timeout = tmp;
2153: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2154:
1.272.6.1 haad 2155: mutex_exit(softnet_lock);
2156:
1.189 atatat 2157: return (0);
2158: }
1.54 lukem 2159:
1.65 matt 2160: #ifdef GATEWAY
1.189 atatat 2161: /*
1.247 liamjfoy 2162: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 2163: */
2164: static int
2165: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2166: {
1.272.6.1 haad 2167: int error;
1.67 thorpej 2168:
1.272.6.1 haad 2169: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
2170: if (error || newp == NULL)
2171: return (error);
2172:
2173: mutex_enter(softnet_lock);
2174: KERNEL_LOCK(1, NULL);
1.212 perry 2175:
1.265 thorpej 2176: ipflow_prune();
1.272.6.1 haad 2177:
2178: KERNEL_UNLOCK_ONE(NULL);
2179: mutex_exit(softnet_lock);
1.144 martin 2180:
1.189 atatat 2181: return (0);
2182: }
1.248 liamjfoy 2183:
2184: static int
2185: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
2186: {
2187: int error, tmp;
2188: struct sysctlnode node;
2189:
2190: node = *rnode;
2191: tmp = ip_hashsize;
2192: node.sysctl_data = &tmp;
2193: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2194: if (error || newp == NULL)
2195: return (error);
2196:
2197: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2198: /*
2199: * Can only fail due to malloc()
2200: */
1.272.6.1 haad 2201: mutex_enter(softnet_lock);
2202: KERNEL_LOCK(1, NULL);
2203:
2204: error = ipflow_invalidate_all(tmp);
2205:
2206: KERNEL_UNLOCK_ONE(NULL);
2207: mutex_exit(softnet_lock);
2208:
1.248 liamjfoy 2209: } else {
2210: /*
2211: * EINVAL if not a power of 2
2212: */
1.272.6.1 haad 2213: error = EINVAL;
1.248 liamjfoy 2214: }
2215:
1.272.6.1 haad 2216: return error;
1.248 liamjfoy 2217: }
1.189 atatat 2218: #endif /* GATEWAY */
1.117 tron 2219:
1.266 thorpej 2220: static int
2221: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
2222: {
2223:
1.271 thorpej 2224: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 2225: }
1.131 itojun 2226:
1.189 atatat 2227: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2228: {
2229: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2230:
1.197 atatat 2231: sysctl_createv(clog, 0, NULL, NULL,
2232: CTLFLAG_PERMANENT,
1.189 atatat 2233: CTLTYPE_NODE, "net", NULL,
2234: NULL, 0, NULL, 0,
2235: CTL_NET, CTL_EOL);
1.197 atatat 2236: sysctl_createv(clog, 0, NULL, NULL,
2237: CTLFLAG_PERMANENT,
1.203 atatat 2238: CTLTYPE_NODE, "inet",
2239: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2240: NULL, 0, NULL, 0,
2241: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2242: sysctl_createv(clog, 0, NULL, NULL,
2243: CTLFLAG_PERMANENT,
1.203 atatat 2244: CTLTYPE_NODE, "ip",
2245: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2246: NULL, 0, NULL, 0,
2247: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2248:
1.197 atatat 2249: sysctl_createv(clog, 0, NULL, NULL,
2250: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2251: CTLTYPE_INT, "forwarding",
2252: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2253: NULL, 0, &ipforwarding, 0,
2254: CTL_NET, PF_INET, IPPROTO_IP,
2255: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2256: sysctl_createv(clog, 0, NULL, NULL,
2257: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2258: CTLTYPE_INT, "redirect",
2259: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2260: NULL, 0, &ipsendredirects, 0,
2261: CTL_NET, PF_INET, IPPROTO_IP,
2262: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2263: sysctl_createv(clog, 0, NULL, NULL,
2264: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2265: CTLTYPE_INT, "ttl",
2266: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2267: NULL, 0, &ip_defttl, 0,
2268: CTL_NET, PF_INET, IPPROTO_IP,
2269: IPCTL_DEFTTL, CTL_EOL);
2270: #ifdef IPCTL_DEFMTU
1.197 atatat 2271: sysctl_createv(clog, 0, NULL, NULL,
2272: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2273: CTLTYPE_INT, "mtu",
2274: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2275: NULL, 0, &ip_mtu, 0,
2276: CTL_NET, PF_INET, IPPROTO_IP,
2277: IPCTL_DEFMTU, CTL_EOL);
2278: #endif /* IPCTL_DEFMTU */
1.197 atatat 2279: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2280: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2281: CTLTYPE_INT, "forwsrcrt",
2282: SYSCTL_DESCR("Enable forwarding of source-routed "
2283: "datagrams"),
1.228 elad 2284: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2285: CTL_NET, PF_INET, IPPROTO_IP,
2286: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2287: sysctl_createv(clog, 0, NULL, NULL,
2288: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2289: CTLTYPE_INT, "directed-broadcast",
2290: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2291: NULL, 0, &ip_directedbcast, 0,
2292: CTL_NET, PF_INET, IPPROTO_IP,
2293: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2294: sysctl_createv(clog, 0, NULL, NULL,
2295: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2296: CTLTYPE_INT, "allowsrcrt",
2297: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2298: NULL, 0, &ip_allowsrcrt, 0,
2299: CTL_NET, PF_INET, IPPROTO_IP,
2300: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2301: sysctl_createv(clog, 0, NULL, NULL,
2302: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2303: CTLTYPE_INT, "subnetsarelocal",
2304: SYSCTL_DESCR("Whether logical subnets are considered "
2305: "local"),
1.189 atatat 2306: NULL, 0, &subnetsarelocal, 0,
2307: CTL_NET, PF_INET, IPPROTO_IP,
2308: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2309: sysctl_createv(clog, 0, NULL, NULL,
2310: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2311: CTLTYPE_INT, "mtudisc",
2312: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2313: NULL, 0, &ip_mtudisc, 0,
2314: CTL_NET, PF_INET, IPPROTO_IP,
2315: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2316: sysctl_createv(clog, 0, NULL, NULL,
2317: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2318: CTLTYPE_INT, "anonportmin",
2319: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2320: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2321: CTL_NET, PF_INET, IPPROTO_IP,
2322: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2323: sysctl_createv(clog, 0, NULL, NULL,
2324: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2325: CTLTYPE_INT, "anonportmax",
2326: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2327: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2328: CTL_NET, PF_INET, IPPROTO_IP,
2329: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2330: sysctl_createv(clog, 0, NULL, NULL,
2331: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2332: CTLTYPE_INT, "mtudisctimeout",
2333: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2334: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2335: CTL_NET, PF_INET, IPPROTO_IP,
2336: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2337: #ifdef GATEWAY
1.197 atatat 2338: sysctl_createv(clog, 0, NULL, NULL,
2339: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2340: CTLTYPE_INT, "maxflows",
2341: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2342: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2343: CTL_NET, PF_INET, IPPROTO_IP,
2344: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2345: sysctl_createv(clog, 0, NULL, NULL,
2346: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2347: CTLTYPE_INT, "hashsize",
2348: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2349: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2350: CTL_NET, PF_INET, IPPROTO_IP,
2351: CTL_CREATE, CTL_EOL);
1.189 atatat 2352: #endif /* GATEWAY */
1.197 atatat 2353: sysctl_createv(clog, 0, NULL, NULL,
2354: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2355: CTLTYPE_INT, "hostzerobroadcast",
2356: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2357: NULL, 0, &hostzeroisbroadcast, 0,
2358: CTL_NET, PF_INET, IPPROTO_IP,
2359: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2360: #if NGIF > 0
1.197 atatat 2361: sysctl_createv(clog, 0, NULL, NULL,
2362: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2363: CTLTYPE_INT, "gifttl",
2364: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2365: NULL, 0, &ip_gif_ttl, 0,
2366: CTL_NET, PF_INET, IPPROTO_IP,
2367: IPCTL_GIF_TTL, CTL_EOL);
2368: #endif /* NGIF */
2369: #ifndef IPNOPRIVPORTS
1.197 atatat 2370: sysctl_createv(clog, 0, NULL, NULL,
2371: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2372: CTLTYPE_INT, "lowportmin",
2373: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2374: "to assign"),
1.189 atatat 2375: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2376: CTL_NET, PF_INET, IPPROTO_IP,
2377: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2378: sysctl_createv(clog, 0, NULL, NULL,
2379: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2380: CTLTYPE_INT, "lowportmax",
2381: SYSCTL_DESCR("Highest privileged ephemeral port number "
2382: "to assign"),
1.189 atatat 2383: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2384: CTL_NET, PF_INET, IPPROTO_IP,
2385: IPCTL_LOWPORTMAX, CTL_EOL);
2386: #endif /* IPNOPRIVPORTS */
1.197 atatat 2387: sysctl_createv(clog, 0, NULL, NULL,
2388: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2389: CTLTYPE_INT, "maxfragpackets",
2390: SYSCTL_DESCR("Maximum number of fragments to retain for "
2391: "possible reassembly"),
1.189 atatat 2392: NULL, 0, &ip_maxfragpackets, 0,
2393: CTL_NET, PF_INET, IPPROTO_IP,
2394: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2395: #if NGRE > 0
1.197 atatat 2396: sysctl_createv(clog, 0, NULL, NULL,
2397: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2398: CTLTYPE_INT, "grettl",
2399: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2400: NULL, 0, &ip_gre_ttl, 0,
2401: CTL_NET, PF_INET, IPPROTO_IP,
2402: IPCTL_GRE_TTL, CTL_EOL);
2403: #endif /* NGRE */
1.197 atatat 2404: sysctl_createv(clog, 0, NULL, NULL,
2405: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2406: CTLTYPE_INT, "checkinterface",
2407: SYSCTL_DESCR("Enable receive side of Strong ES model "
2408: "from RFC1122"),
1.189 atatat 2409: NULL, 0, &ip_checkinterface, 0,
2410: CTL_NET, PF_INET, IPPROTO_IP,
2411: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2412: sysctl_createv(clog, 0, NULL, NULL,
2413: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2414: CTLTYPE_INT, "random_id",
2415: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2416: NULL, 0, &ip_do_randomid, 0,
2417: CTL_NET, PF_INET, IPPROTO_IP,
2418: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2419: sysctl_createv(clog, 0, NULL, NULL,
2420: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2421: CTLTYPE_INT, "do_loopback_cksum",
2422: SYSCTL_DESCR("Perform IP checksum on loopback"),
2423: NULL, 0, &ip_do_loopback_cksum, 0,
2424: CTL_NET, PF_INET, IPPROTO_IP,
2425: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2426: sysctl_createv(clog, 0, NULL, NULL,
2427: CTLFLAG_PERMANENT,
2428: CTLTYPE_STRUCT, "stats",
2429: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 2430: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 2431: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2432: CTL_EOL);
1.1 cgd 2433: }
1.266 thorpej 2434:
2435: void
2436: ip_statinc(u_int stat)
2437: {
2438:
2439: KASSERT(stat < IP_NSTATS);
2440: IP_STATINC(stat);
2441: }
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