Annotation of src/sys/netinet/ip_input.c, Revision 1.287
1.287 ! rmind 1: /* $NetBSD: ip_input.c,v 1.286 2010/04/01 01:23:32 tls 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>
1.287 ! rmind 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.286 2010/04/01 01:23:32 tls Exp $");
1.55 scottr 95:
1.184 jonathan 96: #include "opt_inet.h"
1.278 christos 97: #include "opt_compat_netbsd.h"
1.62 matt 98: #include "opt_gateway.h"
1.69 mrg 99: #include "opt_pfil_hooks.h"
1.91 thorpej 100: #include "opt_ipsec.h"
1.55 scottr 101: #include "opt_mrouting.h"
1.167 martin 102: #include "opt_mbuftrace.h"
1.135 thorpej 103: #include "opt_inet_csum.h"
1.1 cgd 104:
1.5 mycroft 105: #include <sys/param.h>
106: #include <sys/systm.h>
107: #include <sys/malloc.h>
108: #include <sys/mbuf.h>
109: #include <sys/domain.h>
110: #include <sys/protosw.h>
111: #include <sys/socket.h>
1.44 thorpej 112: #include <sys/socketvar.h>
1.5 mycroft 113: #include <sys/errno.h>
114: #include <sys/time.h>
115: #include <sys/kernel.h>
1.72 thorpej 116: #include <sys/pool.h>
1.28 christos 117: #include <sys/sysctl.h>
1.230 elad 118: #include <sys/kauth.h>
1.1 cgd 119:
1.5 mycroft 120: #include <net/if.h>
1.44 thorpej 121: #include <net/if_dl.h>
1.5 mycroft 122: #include <net/route.h>
1.45 mrg 123: #include <net/pfil.h>
1.1 cgd 124:
1.5 mycroft 125: #include <netinet/in.h>
126: #include <netinet/in_systm.h>
127: #include <netinet/ip.h>
128: #include <netinet/in_pcb.h>
1.215 yamt 129: #include <netinet/in_proto.h>
1.5 mycroft 130: #include <netinet/in_var.h>
131: #include <netinet/ip_var.h>
1.266 thorpej 132: #include <netinet/ip_private.h>
1.5 mycroft 133: #include <netinet/ip_icmp.h>
1.89 itojun 134: /* just for gif_ttl */
135: #include <netinet/in_gif.h>
136: #include "gif.h"
1.144 martin 137: #include <net/if_gre.h>
138: #include "gre.h"
1.111 jdolecek 139:
140: #ifdef MROUTING
141: #include <netinet/ip_mroute.h>
142: #endif
1.89 itojun 143:
144: #ifdef IPSEC
145: #include <netinet6/ipsec.h>
1.267 thorpej 146: #include <netinet6/ipsec_private.h>
1.89 itojun 147: #include <netkey/key.h>
148: #endif
1.173 jonathan 149: #ifdef FAST_IPSEC
150: #include <netipsec/ipsec.h>
151: #include <netipsec/key.h>
152: #endif /* FAST_IPSEC*/
1.44 thorpej 153:
1.1 cgd 154: #ifndef IPFORWARDING
155: #ifdef GATEWAY
156: #define IPFORWARDING 1 /* forward IP packets not for us */
157: #else /* GATEWAY */
158: #define IPFORWARDING 0 /* don't forward IP packets not for us */
159: #endif /* GATEWAY */
160: #endif /* IPFORWARDING */
161: #ifndef IPSENDREDIRECTS
162: #define IPSENDREDIRECTS 1
163: #endif
1.26 thorpej 164: #ifndef IPFORWSRCRT
1.47 cjs 165: #define IPFORWSRCRT 1 /* forward source-routed packets */
166: #endif
167: #ifndef IPALLOWSRCRT
1.48 mrg 168: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 169: #endif
1.53 kml 170: #ifndef IPMTUDISC
1.153 itojun 171: #define IPMTUDISC 1
1.53 kml 172: #endif
1.60 kml 173: #ifndef IPMTUDISCTIMEOUT
1.61 kml 174: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 175: #endif
1.53 kml 176:
1.278 christos 177: #ifdef COMPAT_50
178: #include <compat/sys/time.h>
179: #include <compat/sys/socket.h>
180: #endif
181:
1.27 thorpej 182: /*
183: * Note: DIRECTED_BROADCAST is handled this way so that previous
184: * configuration using this option will Just Work.
185: */
186: #ifndef IPDIRECTEDBCAST
187: #ifdef DIRECTED_BROADCAST
188: #define IPDIRECTEDBCAST 1
189: #else
190: #define IPDIRECTEDBCAST 0
191: #endif /* DIRECTED_BROADCAST */
192: #endif /* IPDIRECTEDBCAST */
1.1 cgd 193: int ipforwarding = IPFORWARDING;
194: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 195: int ip_defttl = IPDEFTTL;
1.26 thorpej 196: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 197: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 198: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 199: int ip_mtudisc = IPMTUDISC;
1.156 itojun 200: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 201: #ifdef DIAGNOSTIC
202: int ipprintfs = 0;
203: #endif
1.184 jonathan 204:
205: int ip_do_randomid = 0;
206:
1.165 christos 207: /*
208: * XXX - Setting ip_checkinterface mostly implements the receive side of
209: * the Strong ES model described in RFC 1122, but since the routing table
210: * and transmit implementation do not implement the Strong ES model,
211: * setting this to 1 results in an odd hybrid.
212: *
213: * XXX - ip_checkinterface currently must be disabled if you use ipnat
214: * to translate the destination address to another local interface.
215: *
216: * XXX - ip_checkinterface must be disabled if you add IP aliases
217: * to the loopback interface instead of the interface where the
218: * packets for those addresses are received.
219: */
220: int ip_checkinterface = 0;
221:
1.1 cgd 222:
1.60 kml 223: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
224:
1.1 cgd 225: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 226: u_long in_ifaddrhash; /* size of hash table - 1 */
227: int in_ifaddrentries; /* total number of addrs */
1.212 perry 228: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 229: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 230: u_long in_multihash; /* size of hash table - 1 */
231: int in_multientries; /* total number of addrs */
232: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 233: struct ifqueue ipintrq;
1.286 tls 234:
1.183 jonathan 235: uint16_t ip_id;
1.75 thorpej 236:
1.266 thorpej 237: percpu_t *ipstat_percpu;
238:
1.121 thorpej 239: #ifdef PFIL_HOOKS
240: struct pfil_head inet_pfil_hook;
241: #endif
242:
1.194 jonathan 243: /*
244: * Cached copy of nmbclusters. If nbclusters is different,
245: * recalculate IP parameters derived from nmbclusters.
246: */
247: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 248: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 249:
1.195 thorpej 250: #define CHECK_NMBCLUSTER_PARAMS() \
251: do { \
252: if (__predict_false(ip_nmbclusters != nmbclusters)) \
253: ip_nmbclusters_changed(); \
254: } while (/*CONSTCOND*/0)
1.194 jonathan 255:
1.190 jonathan 256: /* IP datagram reassembly queues (hashed) */
257: #define IPREASS_NHASH_LOG2 6
258: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
259: #define IPREASS_HMASK (IPREASS_NHASH - 1)
260: #define IPREASS_HASH(x,y) \
261: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
262: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 263: int ipq_locked;
1.212 perry 264: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 265: static int ip_nfrags; /* total fragments in reass queues */
266:
267: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
268: int ip_maxfrags; /* limit on fragments. XXX sysctl */
269:
270:
271: /*
272: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
273: * IP reassembly queue buffer managment.
1.212 perry 274: *
1.194 jonathan 275: * We keep a count of total IP fragments (NB: not fragmented packets!)
276: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
277: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
278: * total fragments in reassembly queues.This AIMD policy avoids
279: * repeatedly deleting single packets under heavy fragmentation load
280: * (e.g., from lossy NFS peers).
281: */
1.212 perry 282: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 283: static void ip_reass_drophalf(void);
1.194 jonathan 284:
1.75 thorpej 285:
1.223 perry 286: static inline int ipq_lock_try(void);
287: static inline void ipq_unlock(void);
1.75 thorpej 288:
1.223 perry 289: static inline int
1.211 perry 290: ipq_lock_try(void)
1.75 thorpej 291: {
292: int s;
293:
1.132 thorpej 294: /*
1.149 wiz 295: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 296: * mbuf allocation.
297: */
298: s = splvm();
1.75 thorpej 299: if (ipq_locked) {
300: splx(s);
301: return (0);
302: }
303: ipq_locked = 1;
304: splx(s);
305: return (1);
306: }
307:
1.223 perry 308: static inline void
1.211 perry 309: ipq_unlock(void)
1.75 thorpej 310: {
311: int s;
312:
1.132 thorpej 313: s = splvm();
1.75 thorpej 314: ipq_locked = 0;
315: splx(s);
316: }
317:
318: #ifdef DIAGNOSTIC
319: #define IPQ_LOCK() \
320: do { \
321: if (ipq_lock_try() == 0) { \
322: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
323: panic("ipq_lock"); \
324: } \
1.159 perry 325: } while (/*CONSTCOND*/ 0)
1.75 thorpej 326: #define IPQ_LOCK_CHECK() \
327: do { \
328: if (ipq_locked == 0) { \
329: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
330: panic("ipq lock check"); \
331: } \
1.159 perry 332: } while (/*CONSTCOND*/ 0)
1.75 thorpej 333: #else
334: #define IPQ_LOCK() (void) ipq_lock_try()
335: #define IPQ_LOCK_CHECK() /* nothing */
336: #endif
337:
338: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 339:
1.275 pooka 340: struct pool inmulti_pool;
341: struct pool ipqent_pool;
1.72 thorpej 342:
1.135 thorpej 343: #ifdef INET_CSUM_COUNTERS
344: #include <sys/device.h>
345:
346: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
347: NULL, "inet", "hwcsum bad");
348: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
349: NULL, "inet", "hwcsum ok");
350: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
351: NULL, "inet", "swcsum");
352:
353: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
354:
1.201 matt 355: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
356: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
357: EVCNT_ATTACH_STATIC(ip_swcsum);
358:
1.135 thorpej 359: #else
360:
361: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
362:
363: #endif /* INET_CSUM_COUNTERS */
364:
1.1 cgd 365: /*
366: * We need to save the IP options in case a protocol wants to respond
367: * to an incoming packet over the same route if the packet got here
368: * using IP source routing. This allows connection establishment and
369: * maintenance when the remote end is on a network that is not known
370: * to us.
371: */
372: int ip_nhops = 0;
373: static struct ip_srcrt {
374: struct in_addr dst; /* final destination */
375: char nop; /* one NOP to align */
376: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
377: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
378: } ip_srcrt;
379:
1.210 perry 380: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 381:
1.164 matt 382: #ifdef MBUFTRACE
1.234 dogcow 383: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
384: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 385: #endif
386:
1.284 pooka 387: static void sysctl_net_inet_ip_setup(struct sysctllog **);
388:
1.1 cgd 389: /*
1.194 jonathan 390: * Compute IP limits derived from the value of nmbclusters.
391: */
392: static void
393: ip_nmbclusters_changed(void)
394: {
395: ip_maxfrags = nmbclusters / 4;
396: ip_nmbclusters = nmbclusters;
397: }
398:
399: /*
1.1 cgd 400: * IP initialization: fill in IP protocol switch table.
401: * All protocols not implemented in kernel go to raw IP protocol handler.
402: */
1.8 mycroft 403: void
1.211 perry 404: ip_init(void)
1.1 cgd 405: {
1.199 matt 406: const struct protosw *pr;
1.109 augustss 407: int i;
1.1 cgd 408:
1.284 pooka 409: sysctl_net_inet_ip_setup(NULL);
410:
1.275 pooka 411: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
412: NULL, IPL_SOFTNET);
413: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
414: NULL, IPL_VM);
415:
1.1 cgd 416: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
417: if (pr == 0)
418: panic("ip_init");
419: for (i = 0; i < IPPROTO_MAX; i++)
420: ip_protox[i] = pr - inetsw;
421: for (pr = inetdomain.dom_protosw;
422: pr < inetdomain.dom_protoswNPROTOSW; pr++)
423: if (pr->pr_domain->dom_family == PF_INET &&
424: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
425: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 426:
1.190 jonathan 427: for (i = 0; i < IPREASS_NHASH; i++)
428: LIST_INIT(&ipq[i]);
429:
1.262 matt 430: ip_initid();
1.227 kardel 431: ip_id = time_second & 0xfffff;
1.194 jonathan 432:
1.1 cgd 433: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 434: ip_nmbclusters_changed();
435:
1.181 jonathan 436: TAILQ_INIT(&in_ifaddrhead);
1.272 ad 437: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
438: &in_ifaddrhash);
439: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
440: &in_multihash);
1.160 itojun 441: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 442: #ifdef GATEWAY
1.248 liamjfoy 443: ipflow_init(ip_hashsize);
1.73 thorpej 444: #endif
1.121 thorpej 445:
446: #ifdef PFIL_HOOKS
447: /* Register our Packet Filter hook. */
1.126 thorpej 448: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
449: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 450: i = pfil_head_register(&inet_pfil_hook);
451: if (i != 0)
452: printf("ip_init: WARNING: unable to register pfil hook, "
453: "error %d\n", i);
454: #endif /* PFIL_HOOKS */
1.135 thorpej 455:
1.164 matt 456: #ifdef MBUFTRACE
457: MOWNER_ATTACH(&ip_tx_mowner);
458: MOWNER_ATTACH(&ip_rx_mowner);
459: #endif /* MBUFTRACE */
1.266 thorpej 460:
461: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 462: }
463:
1.229 christos 464: struct sockaddr_in ipaddr = {
465: .sin_len = sizeof(ipaddr),
466: .sin_family = AF_INET,
467: };
1.1 cgd 468: struct route ipforward_rt;
469:
470: /*
1.89 itojun 471: * IP software interrupt routine
472: */
473: void
1.211 perry 474: ipintr(void)
1.89 itojun 475: {
476: int s;
477: struct mbuf *m;
1.286 tls 478: struct ifqueue lcl_intrq;
479:
480: memset(&lcl_intrq, 0, sizeof(lcl_intrq));
481: ipintrq.ifq_maxlen = ipqmaxlen;
1.89 itojun 482:
1.268 ad 483: mutex_enter(softnet_lock);
484: KERNEL_LOCK(1, NULL);
1.286 tls 485: if (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 486: s = splnet();
1.286 tls 487:
488: /* Take existing queue onto stack */
489: lcl_intrq = ipintrq;
490:
491: /* Zero out global queue, preserving maxlen and drops */
492: ipintrq.ifq_head = NULL;
493: ipintrq.ifq_tail = NULL;
494: ipintrq.ifq_len = 0;
495: ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
496: ipintrq.ifq_drops = lcl_intrq.ifq_drops;
497:
1.89 itojun 498: splx(s);
1.286 tls 499: }
500: KERNEL_UNLOCK_ONE(NULL);
501: while (!IF_IS_EMPTY(&lcl_intrq)) {
502: IF_DEQUEUE(&lcl_intrq, m);
1.268 ad 503: if (m == NULL)
504: break;
1.89 itojun 505: ip_input(m);
506: }
1.268 ad 507: mutex_exit(softnet_lock);
1.89 itojun 508: }
509:
510: /*
1.1 cgd 511: * Ip input routine. Checksum and byte swap header. If fragmented
512: * try to reassemble. Process options. Pass to next level.
513: */
1.8 mycroft 514: void
1.89 itojun 515: ip_input(struct mbuf *m)
1.1 cgd 516: {
1.109 augustss 517: struct ip *ip = NULL;
518: struct ipq *fp;
519: struct in_ifaddr *ia;
520: struct ifaddr *ifa;
1.25 cgd 521: struct ipqent *ipqe;
1.89 itojun 522: int hlen = 0, mff, len;
1.100 itojun 523: int downmatch;
1.165 christos 524: int checkif;
1.169 itojun 525: int srcrt = 0;
1.233 tls 526: int s;
1.190 jonathan 527: u_int hash;
1.173 jonathan 528: #ifdef FAST_IPSEC
529: struct m_tag *mtag;
530: struct tdb_ident *tdbi;
531: struct secpolicy *sp;
1.233 tls 532: int error;
1.173 jonathan 533: #endif /* FAST_IPSEC */
1.1 cgd 534:
1.164 matt 535: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 536: #ifdef DIAGNOSTIC
537: if ((m->m_flags & M_PKTHDR) == 0)
538: panic("ipintr no HDR");
1.89 itojun 539: #endif
1.164 matt 540:
1.1 cgd 541: /*
542: * If no IP addresses have been set yet but the interfaces
543: * are receiving, can't do anything with incoming packets yet.
544: */
1.181 jonathan 545: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 546: goto bad;
1.266 thorpej 547: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 548: /*
549: * If the IP header is not aligned, slurp it up into a new
550: * mbuf with space for link headers, in the event we forward
551: * it. Otherwise, if it is aligned, make sure the entire
552: * base IP header is in the first mbuf of the chain.
553: */
1.244 christos 554: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 555: if ((m = m_copyup(m, sizeof(struct ip),
556: (max_linkhdr + 3) & ~3)) == NULL) {
557: /* XXXJRT new stat, please */
1.266 thorpej 558: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 559: return;
560: }
561: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
562: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 563: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 564: return;
565: }
1.1 cgd 566: }
567: ip = mtod(m, struct ip *);
1.13 mycroft 568: if (ip->ip_v != IPVERSION) {
1.266 thorpej 569: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 570: goto bad;
571: }
1.1 cgd 572: hlen = ip->ip_hl << 2;
573: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 574: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 575: goto bad;
576: }
577: if (hlen > m->m_len) {
578: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 579: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 580: return;
1.1 cgd 581: }
582: ip = mtod(m, struct ip *);
583: }
1.98 thorpej 584:
1.85 hwr 585: /*
1.99 thorpej 586: * RFC1122: packets with a multicast source address are
1.98 thorpej 587: * not allowed.
1.85 hwr 588: */
589: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 590: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 591: goto bad;
1.129 itojun 592: }
593:
594: /* 127/8 must not appear on wire - RFC1122 */
595: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
596: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 597: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 598: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 599: goto bad;
1.130 itojun 600: }
1.85 hwr 601: }
602:
1.135 thorpej 603: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 604: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 605: M_CSUM_IPv4_BAD)) {
606: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
607: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
608: goto badcsum;
609:
610: case M_CSUM_IPv4:
611: /* Checksum was okay. */
612: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
613: break;
614:
615: default:
1.206 thorpej 616: /*
617: * Must compute it ourselves. Maybe skip checksum on
618: * loopback interfaces.
619: */
620: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
621: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
622: INET_CSUM_COUNTER_INCR(&ip_swcsum);
623: if (in_cksum(m, hlen) != 0)
624: goto badcsum;
625: }
1.135 thorpej 626: break;
1.1 cgd 627: }
628:
1.121 thorpej 629: /* Retrieve the packet length. */
630: len = ntohs(ip->ip_len);
1.81 proff 631:
632: /*
633: * Check for additional length bogosity
634: */
1.84 proff 635: if (len < hlen) {
1.266 thorpej 636: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 637: goto bad;
638: }
1.1 cgd 639:
640: /*
641: * Check that the amount of data in the buffers
642: * is as at least much as the IP header would have us expect.
643: * Trim mbufs if longer than we expect.
644: * Drop packet if shorter than we expect.
645: */
1.35 mycroft 646: if (m->m_pkthdr.len < len) {
1.266 thorpej 647: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 648: goto bad;
649: }
1.35 mycroft 650: if (m->m_pkthdr.len > len) {
1.1 cgd 651: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 652: m->m_len = len;
653: m->m_pkthdr.len = len;
1.1 cgd 654: } else
1.35 mycroft 655: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 656: }
657:
1.193 scw 658: #if defined(IPSEC)
1.149 wiz 659: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 660: m->m_flags &= ~M_CANFASTFWD;
661: #else
1.64 thorpej 662: /*
663: * Assume that we can create a fast-forward IP flow entry
664: * based on this packet.
665: */
666: m->m_flags |= M_CANFASTFWD;
1.94 itojun 667: #endif
1.64 thorpej 668:
1.36 mrg 669: #ifdef PFIL_HOOKS
1.33 mrg 670: /*
1.64 thorpej 671: * Run through list of hooks for input packets. If there are any
672: * filters which require that additional packets in the flow are
673: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
674: * Note that filters must _never_ set this flag, as another filter
675: * in the list may have previously cleared it.
1.33 mrg 676: */
1.127 itojun 677: /*
678: * let ipfilter look at packet on the wire,
679: * not the decapsulated packet.
680: */
681: #ifdef IPSEC
1.136 itojun 682: if (!ipsec_getnhist(m))
1.186 scw 683: #elif defined(FAST_IPSEC)
684: if (!ipsec_indone(m))
1.127 itojun 685: #else
686: if (1)
687: #endif
688: {
1.169 itojun 689: struct in_addr odst;
690:
691: odst = ip->ip_dst;
1.127 itojun 692: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 693: PFIL_IN) != 0)
694: return;
1.127 itojun 695: if (m == NULL)
696: return;
697: ip = mtod(m, struct ip *);
1.142 darrenr 698: hlen = ip->ip_hl << 2;
1.205 darrenr 699: /*
700: * XXX The setting of "srcrt" here is to prevent ip_forward()
701: * from generating ICMP redirects for packets that have
702: * been redirected by a hook back out on to the same LAN that
703: * they came from and is not an indication that the packet
704: * is being inffluenced by source routing options. This
705: * allows things like
706: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
707: * where tlp0 is both on the 1.1.1.0/24 network and is the
708: * default route for hosts on 1.1.1.0/24. Of course this
709: * also requires a "map tlp0 ..." to complete the story.
710: * One might argue whether or not this kind of network config.
1.212 perry 711: * should be supported in this manner...
1.205 darrenr 712: */
1.169 itojun 713: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 714: }
1.36 mrg 715: #endif /* PFIL_HOOKS */
1.123 thorpej 716:
717: #ifdef ALTQ
718: /* XXX Temporary until ALTQ is changed to use a pfil hook */
719: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
720: /* packet dropped by traffic conditioner */
721: return;
722: }
723: #endif
1.121 thorpej 724:
725: /*
1.1 cgd 726: * Process options and, if not destined for us,
727: * ship it on. ip_dooptions returns 1 when an
728: * error was detected (causing an icmp message
729: * to be sent and the original packet to be freed).
730: */
731: ip_nhops = 0; /* for source routed packets */
732: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 733: return;
1.1 cgd 734:
735: /*
1.165 christos 736: * Enable a consistency check between the destination address
737: * and the arrival interface for a unicast packet (the RFC 1122
738: * strong ES model) if IP forwarding is disabled and the packet
739: * is not locally generated.
740: *
741: * XXX - Checking also should be disabled if the destination
742: * address is ipnat'ed to a different interface.
743: *
744: * XXX - Checking is incompatible with IP aliases added
745: * to the loopback interface instead of the interface where
746: * the packets are received.
747: *
748: * XXX - We need to add a per ifaddr flag for this so that
749: * we get finer grain control.
750: */
751: checkif = ip_checkinterface && (ipforwarding == 0) &&
752: (m->m_pkthdr.rcvif != NULL) &&
753: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
754:
755: /*
1.1 cgd 756: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 757: *
758: * Traditional 4.4BSD did not consult IFF_UP at all.
759: * The behavior here is to treat addresses on !IFF_UP interface
760: * as not mine.
1.1 cgd 761: */
1.100 itojun 762: downmatch = 0;
1.140 matt 763: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 764: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 765: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
766: continue;
1.97 itojun 767: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
768: break;
1.100 itojun 769: else
770: downmatch++;
1.97 itojun 771: }
772: }
1.86 thorpej 773: if (ia != NULL)
774: goto ours;
1.225 christos 775: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 776: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 777: if (ifa->ifa_addr->sa_family != AF_INET)
778: continue;
1.57 tls 779: ia = ifatoia(ifa);
1.35 mycroft 780: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
781: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 782: /*
783: * Look for all-0's host part (old broadcast addr),
784: * either for subnet or net.
785: */
786: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 787: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 788: goto ours;
1.57 tls 789: /*
790: * An interface with IP address zero accepts
791: * all packets that arrive on that interface.
792: */
793: if (in_nullhost(ia->ia_addr.sin_addr))
794: goto ours;
1.1 cgd 795: }
796: }
1.18 mycroft 797: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 798: struct in_multi *inm;
799: #ifdef MROUTING
800: extern struct socket *ip_mrouter;
1.10 brezak 801:
1.4 hpeyerl 802: if (ip_mrouter) {
803: /*
804: * If we are acting as a multicast router, all
805: * incoming multicast packets are passed to the
806: * kernel-level multicast forwarding function.
807: * The packet is returned (relatively) intact; if
808: * ip_mforward() returns a non-zero value, the packet
809: * must be discarded, else it may be accepted below.
810: *
811: * (The IP ident field is put in the same byte order
812: * as expected when ip_mforward() is called from
813: * ip_output().)
814: */
1.13 mycroft 815: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 816: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 817: m_freem(m);
1.89 itojun 818: return;
1.4 hpeyerl 819: }
820:
821: /*
822: * The process-level routing demon needs to receive
823: * all multicast IGMP packets, whether or not this
824: * host belongs to their destination groups.
825: */
826: if (ip->ip_p == IPPROTO_IGMP)
827: goto ours;
1.266 thorpej 828: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 829: }
830: #endif
831: /*
832: * See if we belong to the destination multicast group on the
833: * arrival interface.
834: */
835: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
836: if (inm == NULL) {
1.266 thorpej 837: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 838: m_freem(m);
1.89 itojun 839: return;
1.4 hpeyerl 840: }
841: goto ours;
842: }
1.19 mycroft 843: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 844: in_nullhost(ip->ip_dst))
1.1 cgd 845: goto ours;
846:
847: /*
848: * Not for us; forward if possible and desirable.
849: */
850: if (ipforwarding == 0) {
1.266 thorpej 851: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 852: m_freem(m);
1.100 itojun 853: } else {
854: /*
855: * If ip_dst matched any of my address on !IFF_UP interface,
856: * and there's no IFF_UP interface that matches ip_dst,
857: * send icmp unreach. Forwarding it will result in in-kernel
858: * forwarding loop till TTL goes to 0.
859: */
860: if (downmatch) {
861: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 862: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 863: return;
864: }
1.145 itojun 865: #ifdef IPSEC
866: if (ipsec4_in_reject(m, NULL)) {
1.267 thorpej 867: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 868: goto bad;
869: }
870: #endif
1.173 jonathan 871: #ifdef FAST_IPSEC
872: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
873: s = splsoftnet();
874: if (mtag != NULL) {
875: tdbi = (struct tdb_ident *)(mtag + 1);
876: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
877: } else {
878: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 879: IP_FORWARDING, &error);
1.173 jonathan 880: }
881: if (sp == NULL) { /* NB: can happen if error */
882: splx(s);
883: /*XXX error stat???*/
884: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
885: goto bad;
886: }
887:
888: /*
889: * Check security policy against packet attributes.
890: */
891: error = ipsec_in_reject(sp, m);
892: KEY_FREESP(&sp);
893: splx(s);
894: if (error) {
1.266 thorpej 895: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 896: goto bad;
1.193 scw 897: }
898:
899: /*
900: * Peek at the outbound SP for this packet to determine if
901: * it's a Fast Forward candidate.
902: */
903: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
904: if (mtag != NULL)
905: m->m_flags &= ~M_CANFASTFWD;
906: else {
907: s = splsoftnet();
908: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
909: (IP_FORWARDING |
910: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
911: &error, NULL);
912: if (sp != NULL) {
913: m->m_flags &= ~M_CANFASTFWD;
914: KEY_FREESP(&sp);
915: }
916: splx(s);
1.173 jonathan 917: }
918: #endif /* FAST_IPSEC */
1.145 itojun 919:
1.169 itojun 920: ip_forward(m, srcrt);
1.100 itojun 921: }
1.89 itojun 922: return;
1.1 cgd 923:
924: ours:
925: /*
926: * If offset or IP_MF are set, must reassemble.
927: * Otherwise, nothing need be done.
928: * (We could look in the reassembly queue to see
929: * if the packet was previously fragmented,
930: * but it's not worth the time; just let them time out.)
931: */
1.155 itojun 932: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.287 ! rmind 933: u_int off;
1.258 matt 934: /*
935: * Prevent TCP blind data attacks by not allowing non-initial
936: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 937: * size) and making sure the first fragment is at least 68
938: * bytes.
1.258 matt 939: */
1.260 matt 940: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 941: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266 thorpej 942: IP_STATINC(IP_STAT_BADFRAGS);
1.258 matt 943: goto bad;
944: }
1.1 cgd 945:
946: /*
947: * Adjust ip_len to not reflect header,
1.25 cgd 948: * set ipqe_mff if more fragments are expected,
1.1 cgd 949: * convert offset of this to bytes.
950: */
1.155 itojun 951: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
952: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 953: if (mff) {
1.287 ! rmind 954: /*
! 955: * Make sure that fragments have a data length
1.16 cgd 956: * that's a non-zero multiple of 8 bytes.
1.287 ! rmind 957: */
1.155 itojun 958: if (ntohs(ip->ip_len) == 0 ||
959: (ntohs(ip->ip_len) & 0x7) != 0) {
1.266 thorpej 960: IP_STATINC(IP_STAT_BADFRAGS);
1.287 ! rmind 961: goto bad;
! 962: }
! 963: }
! 964: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
! 965:
! 966: /*
! 967: * Look for queue of fragments of this datagram.
! 968: */
! 969: IPQ_LOCK();
! 970: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
! 971: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
! 972: if (ip->ip_id != fp->ipq_id)
! 973: continue;
! 974: if (!in_hosteq(ip->ip_src, fp->ipq_src))
! 975: continue;
! 976: if (!in_hosteq(ip->ip_dst, fp->ipq_dst))
! 977: continue;
! 978: if (ip->ip_p != fp->ipq_p)
! 979: continue;
! 980: /*
! 981: * Make sure the TOS is matches previous fragments.
! 982: */
! 983: if (ip->ip_tos != fp->ipq_tos) {
! 984: IP_STATINC(IP_STAT_BADFRAGS);
1.75 thorpej 985: IPQ_UNLOCK();
1.16 cgd 986: goto bad;
987: }
1.287 ! rmind 988: break;
1.16 cgd 989: }
1.1 cgd 990:
991: /*
992: * If datagram marked as having more fragments
993: * or if this is not the first fragment,
994: * attempt reassembly; if it succeeds, proceed.
995: */
1.155 itojun 996: if (mff || ip->ip_off != htons(0)) {
1.266 thorpej 997: IP_STATINC(IP_STAT_FRAGMENTS);
1.233 tls 998: s = splvm();
1.72 thorpej 999: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 1000: splx(s);
1.25 cgd 1001: if (ipqe == NULL) {
1.266 thorpej 1002: IP_STATINC(IP_STAT_RCVMEMDROP);
1.75 thorpej 1003: IPQ_UNLOCK();
1.25 cgd 1004: goto bad;
1005: }
1006: ipqe->ipqe_mff = mff;
1.50 thorpej 1007: ipqe->ipqe_m = m;
1.25 cgd 1008: ipqe->ipqe_ip = ip;
1.190 jonathan 1009: m = ip_reass(ipqe, fp, &ipq[hash]);
1.287 ! rmind 1010: if (m == NULL) {
1.75 thorpej 1011: IPQ_UNLOCK();
1.89 itojun 1012: return;
1.75 thorpej 1013: }
1.266 thorpej 1014: IP_STATINC(IP_STAT_REASSEMBLED);
1.50 thorpej 1015: ip = mtod(m, struct ip *);
1.74 thorpej 1016: hlen = ip->ip_hl << 2;
1.155 itojun 1017: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.287 ! rmind 1018: } else if (fp) {
! 1019: ip_freef(fp);
! 1020: }
1.75 thorpej 1021: IPQ_UNLOCK();
1.79 mycroft 1022: }
1.128 itojun 1023:
1.173 jonathan 1024: #if defined(IPSEC)
1.128 itojun 1025: /*
1026: * enforce IPsec policy checking if we are seeing last header.
1027: * note that we do not visit this with protocols with pcb layer
1028: * code - like udp/tcp/raw ip.
1029: */
1030: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
1031: ipsec4_in_reject(m, NULL)) {
1.267 thorpej 1032: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 1033: goto bad;
1034: }
1035: #endif
1.226 liamjfoy 1036: #ifdef FAST_IPSEC
1.173 jonathan 1037: /*
1038: * enforce IPsec policy checking if we are seeing last header.
1039: * note that we do not visit this with protocols with pcb layer
1040: * code - like udp/tcp/raw ip.
1041: */
1042: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1043: /*
1044: * Check if the packet has already had IPsec processing
1045: * done. If so, then just pass it along. This tag gets
1046: * set during AH, ESP, etc. input handling, before the
1047: * packet is returned to the ip input queue for delivery.
1.212 perry 1048: */
1.173 jonathan 1049: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1050: s = splsoftnet();
1051: if (mtag != NULL) {
1052: tdbi = (struct tdb_ident *)(mtag + 1);
1053: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1054: } else {
1055: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1056: IP_FORWARDING, &error);
1.173 jonathan 1057: }
1058: if (sp != NULL) {
1059: /*
1060: * Check security policy against packet attributes.
1061: */
1062: error = ipsec_in_reject(sp, m);
1063: KEY_FREESP(&sp);
1064: } else {
1065: /* XXX error stat??? */
1066: error = EINVAL;
1067: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1068: }
1069: splx(s);
1070: if (error)
1071: goto bad;
1072: }
1073: #endif /* FAST_IPSEC */
1.1 cgd 1074:
1075: /*
1076: * Switch out to protocol's input routine.
1077: */
1.82 aidan 1078: #if IFA_STATS
1.122 itojun 1079: if (ia && ip)
1.155 itojun 1080: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1081: #endif
1.266 thorpej 1082: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 1083: {
1084: int off = hlen, nh = ip->ip_p;
1085:
1086: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1087: return;
1088: }
1.1 cgd 1089: bad:
1090: m_freem(m);
1.135 thorpej 1091: return;
1092:
1093: badcsum:
1.266 thorpej 1094: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 1095: m_freem(m);
1.1 cgd 1096: }
1097:
1098: /*
1099: * Take incoming datagram fragment and try to
1100: * reassemble it into whole datagram. If a chain for
1101: * reassembly of this datagram already exists, then it
1102: * is given as fp; otherwise have to make a chain.
1103: */
1.50 thorpej 1104: struct mbuf *
1.211 perry 1105: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1106: {
1.109 augustss 1107: struct mbuf *m = ipqe->ipqe_m;
1108: struct ipqent *nq, *p, *q;
1.25 cgd 1109: struct ip *ip;
1.1 cgd 1110: struct mbuf *t;
1.25 cgd 1111: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1112: int i, next, s;
1.1 cgd 1113:
1.75 thorpej 1114: IPQ_LOCK_CHECK();
1115:
1.1 cgd 1116: /*
1117: * Presence of header sizes in mbufs
1118: * would confuse code below.
1119: */
1120: m->m_data += hlen;
1121: m->m_len -= hlen;
1122:
1.194 jonathan 1123: #ifdef notyet
1124: /* make sure fragment limit is up-to-date */
1125: CHECK_NMBCLUSTER_PARAMS();
1126:
1127: /* If we have too many fragments, drop the older half. */
1128: if (ip_nfrags >= ip_maxfrags)
1129: ip_reass_drophalf(void);
1130: #endif
1131:
1.1 cgd 1132: /*
1.192 jonathan 1133: * We are about to add a fragment; increment frag count.
1134: */
1135: ip_nfrags++;
1.212 perry 1136:
1.192 jonathan 1137: /*
1.1 cgd 1138: * If first fragment to arrive, create a reassembly queue.
1139: */
1140: if (fp == 0) {
1.131 itojun 1141: /*
1142: * Enforce upper bound on number of fragmented packets
1143: * for which we attempt reassembly;
1144: * If maxfrag is 0, never accept fragments.
1145: * If maxfrag is -1, accept all fragments without limitation.
1146: */
1147: if (ip_maxfragpackets < 0)
1148: ;
1149: else if (ip_nfragpackets >= ip_maxfragpackets)
1150: goto dropfrag;
1151: ip_nfragpackets++;
1.277 cegger 1152: fp = malloc(sizeof (struct ipq), M_FTABLE, M_NOWAIT);
1.50 thorpej 1153: if (fp == NULL)
1.1 cgd 1154: goto dropfrag;
1.190 jonathan 1155: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1156: fp->ipq_nfrags = 1;
1.1 cgd 1157: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1158: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1159: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260 matt 1160: fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148 matt 1161: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1162: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1163: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1164: p = NULL;
1.1 cgd 1165: goto insert;
1.192 jonathan 1166: } else {
1167: fp->ipq_nfrags++;
1.1 cgd 1168: }
1169:
1170: /*
1171: * Find a segment which begins after this one does.
1172: */
1.148 matt 1173: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1174: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1175: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1176: break;
1177:
1178: /*
1179: * If there is a preceding segment, it may provide some of
1180: * our data already. If so, drop the data from the incoming
1181: * segment. If it provides all of our data, drop us.
1182: */
1.25 cgd 1183: if (p != NULL) {
1.155 itojun 1184: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1185: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1186: if (i > 0) {
1.155 itojun 1187: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1188: goto dropfrag;
1.50 thorpej 1189: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1190: ipqe->ipqe_ip->ip_off =
1191: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1192: ipqe->ipqe_ip->ip_len =
1193: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1194: }
1195: }
1196:
1197: /*
1198: * While we overlap succeeding segments trim them or,
1199: * if they are completely covered, dequeue them.
1200: */
1.155 itojun 1201: for (; q != NULL &&
1202: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1203: ntohs(q->ipqe_ip->ip_off); q = nq) {
1204: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1205: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1206: if (i < ntohs(q->ipqe_ip->ip_len)) {
1207: q->ipqe_ip->ip_len =
1208: htons(ntohs(q->ipqe_ip->ip_len) - i);
1209: q->ipqe_ip->ip_off =
1210: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1211: m_adj(q->ipqe_m, i);
1.1 cgd 1212: break;
1213: }
1.148 matt 1214: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1215: m_freem(q->ipqe_m);
1.148 matt 1216: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1217: s = splvm();
1.72 thorpej 1218: pool_put(&ipqent_pool, q);
1.233 tls 1219: splx(s);
1.192 jonathan 1220: fp->ipq_nfrags--;
1221: ip_nfrags--;
1.1 cgd 1222: }
1223:
1224: insert:
1225: /*
1226: * Stick new segment in its place;
1227: * check for complete reassembly.
1228: */
1.25 cgd 1229: if (p == NULL) {
1.148 matt 1230: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1231: } else {
1.148 matt 1232: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1233: }
1.1 cgd 1234: next = 0;
1.148 matt 1235: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1236: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1237: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1238: return (0);
1.155 itojun 1239: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1240: }
1.25 cgd 1241: if (p->ipqe_mff)
1.1 cgd 1242: return (0);
1243:
1244: /*
1.41 thorpej 1245: * Reassembly is complete. Check for a bogus message size and
1246: * concatenate fragments.
1.1 cgd 1247: */
1.148 matt 1248: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1249: ip = q->ipqe_ip;
1.41 thorpej 1250: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266 thorpej 1251: IP_STATINC(IP_STAT_TOOLONG);
1.41 thorpej 1252: ip_freef(fp);
1253: return (0);
1254: }
1.50 thorpej 1255: m = q->ipqe_m;
1.1 cgd 1256: t = m->m_next;
1257: m->m_next = 0;
1258: m_cat(m, t);
1.148 matt 1259: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1260: s = splvm();
1.72 thorpej 1261: pool_put(&ipqent_pool, q);
1.233 tls 1262: splx(s);
1.25 cgd 1263: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1264: t = q->ipqe_m;
1.148 matt 1265: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1266: s = splvm();
1.72 thorpej 1267: pool_put(&ipqent_pool, q);
1.233 tls 1268: splx(s);
1.1 cgd 1269: m_cat(m, t);
1270: }
1.192 jonathan 1271: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1272:
1273: /*
1274: * Create header for new ip packet by
1275: * modifying header of first packet;
1276: * dequeue and discard fragment reassembly header.
1277: * Make header visible.
1278: */
1.155 itojun 1279: ip->ip_len = htons(next);
1.25 cgd 1280: ip->ip_src = fp->ipq_src;
1281: ip->ip_dst = fp->ipq_dst;
1282: LIST_REMOVE(fp, ipq_q);
1.277 cegger 1283: free(fp, M_FTABLE);
1.131 itojun 1284: ip_nfragpackets--;
1.1 cgd 1285: m->m_len += (ip->ip_hl << 2);
1286: m->m_data -= (ip->ip_hl << 2);
1287: /* some debugging cruft by sklower, below, will go away soon */
1288: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1289: int plen = 0;
1.50 thorpej 1290: for (t = m; t; t = t->m_next)
1291: plen += t->m_len;
1292: m->m_pkthdr.len = plen;
1.213 yamt 1293: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1294: }
1.50 thorpej 1295: return (m);
1.1 cgd 1296:
1297: dropfrag:
1.192 jonathan 1298: if (fp != 0)
1299: fp->ipq_nfrags--;
1300: ip_nfrags--;
1.266 thorpej 1301: IP_STATINC(IP_STAT_FRAGDROPPED);
1.1 cgd 1302: m_freem(m);
1.233 tls 1303: s = splvm();
1.72 thorpej 1304: pool_put(&ipqent_pool, ipqe);
1.233 tls 1305: splx(s);
1.1 cgd 1306: return (0);
1307: }
1308:
1309: /*
1310: * Free a fragment reassembly header and all
1311: * associated datagrams.
1312: */
1.8 mycroft 1313: void
1.211 perry 1314: ip_freef(struct ipq *fp)
1.1 cgd 1315: {
1.109 augustss 1316: struct ipqent *q, *p;
1.192 jonathan 1317: u_int nfrags = 0;
1.233 tls 1318: int s;
1.1 cgd 1319:
1.75 thorpej 1320: IPQ_LOCK_CHECK();
1321:
1.148 matt 1322: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1323: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1324: m_freem(q->ipqe_m);
1.192 jonathan 1325: nfrags++;
1.148 matt 1326: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1327: s = splvm();
1.72 thorpej 1328: pool_put(&ipqent_pool, q);
1.233 tls 1329: splx(s);
1.1 cgd 1330: }
1.192 jonathan 1331:
1332: if (nfrags != fp->ipq_nfrags)
1333: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1334: ip_nfrags -= nfrags;
1.25 cgd 1335: LIST_REMOVE(fp, ipq_q);
1.277 cegger 1336: free(fp, M_FTABLE);
1.131 itojun 1337: ip_nfragpackets--;
1.1 cgd 1338: }
1339:
1340: /*
1.194 jonathan 1341: * IP reassembly TTL machinery for multiplicative drop.
1342: */
1343: static u_int fragttl_histo[(IPFRAGTTL+1)];
1344:
1345:
1346: /*
1347: * Decrement TTL of all reasembly queue entries by `ticks'.
1348: * Count number of distinct fragments (as opposed to partial, fragmented
1349: * datagrams) in the reassembly queue. While we traverse the entire
1350: * reassembly queue, compute and return the median TTL over all fragments.
1351: */
1352: static u_int
1353: ip_reass_ttl_decr(u_int ticks)
1354: {
1.198 matt 1355: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1356: struct ipq *fp, *nfp;
1.198 matt 1357: int i;
1.212 perry 1358:
1.194 jonathan 1359: nfrags = 0;
1360: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1361:
1.194 jonathan 1362: for (i = 0; i < IPREASS_NHASH; i++) {
1363: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1364: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1365: 0 : fp->ipq_ttl - ticks);
1366: nfp = LIST_NEXT(fp, ipq_q);
1367: if (fp->ipq_ttl == 0) {
1.266 thorpej 1368: IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194 jonathan 1369: ip_freef(fp);
1370: } else {
1371: nfrags += fp->ipq_nfrags;
1372: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1373: }
1374: }
1375: }
1376:
1377: KASSERT(ip_nfrags == nfrags);
1378:
1379: /* Find median (or other drop fraction) in histogram. */
1380: dropfraction = (ip_nfrags / 2);
1381: keepfraction = ip_nfrags - dropfraction;
1382: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1383: median += fragttl_histo[i];
1384: if (median >= keepfraction)
1385: break;
1386: }
1387:
1388: /* Return TTL of median (or other fraction). */
1389: return (u_int)i;
1390: }
1391:
1392: void
1393: ip_reass_drophalf(void)
1394: {
1395:
1396: u_int median_ticks;
1397: /*
1398: * Compute median TTL of all fragments, and count frags
1399: * with that TTL or lower (roughly half of all fragments).
1400: */
1401: median_ticks = ip_reass_ttl_decr(0);
1402:
1403: /* Drop half. */
1404: median_ticks = ip_reass_ttl_decr(median_ticks);
1405:
1406: }
1407:
1408: /*
1.1 cgd 1409: * IP timer processing;
1410: * if a timer expires on a reassembly
1411: * queue, discard it.
1412: */
1.8 mycroft 1413: void
1.211 perry 1414: ip_slowtimo(void)
1.1 cgd 1415: {
1.191 jonathan 1416: static u_int dropscanidx = 0;
1417: u_int i;
1.194 jonathan 1418: u_int median_ttl;
1.268 ad 1419:
1420: mutex_enter(softnet_lock);
1421: KERNEL_LOCK(1, NULL);
1.1 cgd 1422:
1.75 thorpej 1423: IPQ_LOCK();
1.194 jonathan 1424:
1425: /* Age TTL of all fragments by 1 tick .*/
1426: median_ttl = ip_reass_ttl_decr(1);
1427:
1428: /* make sure fragment limit is up-to-date */
1429: CHECK_NMBCLUSTER_PARAMS();
1430:
1431: /* If we have too many fragments, drop the older half. */
1432: if (ip_nfrags > ip_maxfrags)
1433: ip_reass_ttl_decr(median_ttl);
1434:
1.131 itojun 1435: /*
1.194 jonathan 1436: * If we are over the maximum number of fragmented packets
1.131 itojun 1437: * (due to the limit being lowered), drain off
1.190 jonathan 1438: * enough to get down to the new limit. Start draining
1439: * from the reassembly hashqueue most recently drained.
1.131 itojun 1440: */
1441: if (ip_maxfragpackets < 0)
1442: ;
1443: else {
1.190 jonathan 1444: int wrapped = 0;
1445:
1446: i = dropscanidx;
1447: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1448: while (LIST_FIRST(&ipq[i]) != NULL)
1449: ip_freef(LIST_FIRST(&ipq[i]));
1450: if (++i >= IPREASS_NHASH) {
1451: i = 0;
1452: }
1453: /*
1454: * Dont scan forever even if fragment counters are
1455: * wrong: stop after scanning entire reassembly queue.
1456: */
1457: if (i == dropscanidx)
1458: wrapped = 1;
1459: }
1460: dropscanidx = i;
1.131 itojun 1461: }
1.75 thorpej 1462: IPQ_UNLOCK();
1.268 ad 1463:
1464: KERNEL_UNLOCK_ONE(NULL);
1465: mutex_exit(softnet_lock);
1.1 cgd 1466: }
1467:
1468: /*
1.270 ad 1469: * Drain off all datagram fragments. Don't acquire softnet_lock as
1470: * can be called from hardware interrupt context.
1.1 cgd 1471: */
1.8 mycroft 1472: void
1.211 perry 1473: ip_drain(void)
1.1 cgd 1474: {
1475:
1.268 ad 1476: KERNEL_LOCK(1, NULL);
1477:
1.75 thorpej 1478: /*
1479: * We may be called from a device's interrupt context. If
1480: * the ipq is already busy, just bail out now.
1481: */
1.268 ad 1482: if (ipq_lock_try() != 0) {
1483: /*
1484: * Drop half the total fragments now. If more mbufs are
1485: * needed, we will be called again soon.
1486: */
1487: ip_reass_drophalf();
1488: IPQ_UNLOCK();
1489: }
1.75 thorpej 1490:
1.268 ad 1491: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 1492: }
1493:
1494: /*
1495: * Do option processing on a datagram,
1496: * possibly discarding it if bad options are encountered,
1497: * or forwarding it if source-routed.
1498: * Returns 1 if packet has been forwarded/freed,
1499: * 0 if the packet should be processed further.
1500: */
1.8 mycroft 1501: int
1.211 perry 1502: ip_dooptions(struct mbuf *m)
1.1 cgd 1503: {
1.109 augustss 1504: struct ip *ip = mtod(m, struct ip *);
1505: u_char *cp, *cp0;
1506: struct ip_timestamp *ipt;
1507: struct in_ifaddr *ia;
1.1 cgd 1508: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1509: struct in_addr dst;
1.1 cgd 1510: n_time ntime;
1511:
1.13 mycroft 1512: dst = ip->ip_dst;
1.1 cgd 1513: cp = (u_char *)(ip + 1);
1514: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1515: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1516: opt = cp[IPOPT_OPTVAL];
1517: if (opt == IPOPT_EOL)
1518: break;
1519: if (opt == IPOPT_NOP)
1520: optlen = 1;
1521: else {
1.113 itojun 1522: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1523: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1524: goto bad;
1525: }
1.1 cgd 1526: optlen = cp[IPOPT_OLEN];
1.114 itojun 1527: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1528: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1529: goto bad;
1530: }
1531: }
1532: switch (opt) {
1533:
1534: default:
1535: break;
1536:
1537: /*
1538: * Source routing with record.
1539: * Find interface with current destination address.
1540: * If none on this machine then drop if strictly routed,
1541: * or do nothing if loosely routed.
1542: * Record interface address and bring up next address
1543: * component. If strictly routed make sure next
1544: * address is on directly accessible net.
1545: */
1546: case IPOPT_LSRR:
1547: case IPOPT_SSRR:
1.47 cjs 1548: if (ip_allowsrcrt == 0) {
1549: type = ICMP_UNREACH;
1550: code = ICMP_UNREACH_NET_PROHIB;
1551: goto bad;
1552: }
1.114 itojun 1553: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1554: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1555: goto bad;
1556: }
1.1 cgd 1557: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1558: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1559: goto bad;
1560: }
1561: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1562: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1563: if (ia == 0) {
1564: if (opt == IPOPT_SSRR) {
1565: type = ICMP_UNREACH;
1566: code = ICMP_UNREACH_SRCFAIL;
1567: goto bad;
1568: }
1569: /*
1570: * Loose routing, and not at next destination
1571: * yet; nothing to do except forward.
1572: */
1573: break;
1574: }
1575: off--; /* 0 origin */
1.112 sommerfe 1576: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1577: /*
1578: * End of source route. Should be for us.
1579: */
1580: save_rte(cp, ip->ip_src);
1581: break;
1582: }
1583: /*
1584: * locate outgoing interface
1585: */
1.281 tsutsui 1586: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 1587: sizeof(ipaddr.sin_addr));
1.96 thorpej 1588: if (opt == IPOPT_SSRR)
1.196 itojun 1589: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1590: else
1.1 cgd 1591: ia = ip_rtaddr(ipaddr.sin_addr);
1592: if (ia == 0) {
1593: type = ICMP_UNREACH;
1594: code = ICMP_UNREACH_SRCFAIL;
1595: goto bad;
1596: }
1597: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1598: bcopy((void *)&ia->ia_addr.sin_addr,
1599: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1600: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1601: /*
1602: * Let ip_intr's mcast routing check handle mcast pkts
1603: */
1.18 mycroft 1604: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1605: break;
1606:
1607: case IPOPT_RR:
1.114 itojun 1608: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1609: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1610: goto bad;
1611: }
1.1 cgd 1612: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1613: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1614: goto bad;
1615: }
1616: /*
1617: * If no space remains, ignore.
1618: */
1619: off--; /* 0 origin */
1.112 sommerfe 1620: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1621: break;
1.281 tsutsui 1622: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1623: sizeof(ipaddr.sin_addr));
1624: /*
1625: * locate outgoing interface; if we're the destination,
1626: * use the incoming interface (should be same).
1627: */
1.96 thorpej 1628: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1629: == NULL &&
1630: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1631: type = ICMP_UNREACH;
1632: code = ICMP_UNREACH_HOST;
1633: goto bad;
1634: }
1.244 christos 1635: bcopy((void *)&ia->ia_addr.sin_addr,
1636: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1637: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1638: break;
1639:
1640: case IPOPT_TS:
1641: code = cp - (u_char *)ip;
1642: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1643: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1644: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1645: goto bad;
1.114 itojun 1646: }
1647: if (ipt->ipt_ptr < 5) {
1648: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1649: goto bad;
1650: }
1.15 cgd 1651: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1652: if (++ipt->ipt_oflw == 0) {
1653: code = (u_char *)&ipt->ipt_ptr -
1654: (u_char *)ip;
1.1 cgd 1655: goto bad;
1.114 itojun 1656: }
1.1 cgd 1657: break;
1658: }
1.104 thorpej 1659: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1660: switch (ipt->ipt_flg) {
1661:
1662: case IPOPT_TS_TSONLY:
1663: break;
1664:
1665: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1666: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1667: sizeof(struct in_addr) > ipt->ipt_len) {
1668: code = (u_char *)&ipt->ipt_ptr -
1669: (u_char *)ip;
1.1 cgd 1670: goto bad;
1.114 itojun 1671: }
1.13 mycroft 1672: ipaddr.sin_addr = dst;
1.96 thorpej 1673: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1674: m->m_pkthdr.rcvif));
1.13 mycroft 1675: if (ia == 0)
1676: continue;
1.104 thorpej 1677: bcopy(&ia->ia_addr.sin_addr,
1678: cp0, sizeof(struct in_addr));
1.1 cgd 1679: ipt->ipt_ptr += sizeof(struct in_addr);
1680: break;
1681:
1682: case IPOPT_TS_PRESPEC:
1.66 thorpej 1683: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1684: sizeof(struct in_addr) > ipt->ipt_len) {
1685: code = (u_char *)&ipt->ipt_ptr -
1686: (u_char *)ip;
1.1 cgd 1687: goto bad;
1.114 itojun 1688: }
1.281 tsutsui 1689: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1690: sizeof(struct in_addr));
1.96 thorpej 1691: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1692: == NULL)
1.1 cgd 1693: continue;
1694: ipt->ipt_ptr += sizeof(struct in_addr);
1695: break;
1696:
1697: default:
1.114 itojun 1698: /* XXX can't take &ipt->ipt_flg */
1699: code = (u_char *)&ipt->ipt_ptr -
1700: (u_char *)ip + 1;
1.1 cgd 1701: goto bad;
1702: }
1703: ntime = iptime();
1.107 thorpej 1704: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1705: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1706: sizeof(n_time));
1707: ipt->ipt_ptr += sizeof(n_time);
1708: }
1709: }
1710: if (forward) {
1.26 thorpej 1711: if (ip_forwsrcrt == 0) {
1712: type = ICMP_UNREACH;
1713: code = ICMP_UNREACH_SRCFAIL;
1714: goto bad;
1715: }
1.1 cgd 1716: ip_forward(m, 1);
1717: return (1);
1.13 mycroft 1718: }
1719: return (0);
1.1 cgd 1720: bad:
1.13 mycroft 1721: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1722: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1723: return (1);
1724: }
1725:
1726: /*
1727: * Given address of next destination (final or next hop),
1728: * return internet address info of interface to be used to get there.
1729: */
1730: struct in_ifaddr *
1.211 perry 1731: ip_rtaddr(struct in_addr dst)
1.1 cgd 1732: {
1.249 dyoung 1733: struct rtentry *rt;
1734: union {
1735: struct sockaddr dst;
1736: struct sockaddr_in dst4;
1737: } u;
1738:
1739: sockaddr_in_init(&u.dst4, &dst, 0);
1740:
1741: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1742: return NULL;
1743:
1744: return ifatoia(rt->rt_ifa);
1.1 cgd 1745: }
1746:
1747: /*
1748: * Save incoming source route for use in replies,
1749: * to be picked up later by ip_srcroute if the receiver is interested.
1750: */
1.13 mycroft 1751: void
1.211 perry 1752: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1753: {
1754: unsigned olen;
1755:
1756: olen = option[IPOPT_OLEN];
1757: #ifdef DIAGNOSTIC
1758: if (ipprintfs)
1.39 christos 1759: printf("save_rte: olen %d\n", olen);
1.89 itojun 1760: #endif /* 0 */
1.1 cgd 1761: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1762: return;
1.281 tsutsui 1763: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1764: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1765: ip_srcrt.dst = dst;
1766: }
1767:
1768: /*
1769: * Retrieve incoming source route for use in replies,
1770: * in the same form used by setsockopt.
1771: * The first hop is placed before the options, will be removed later.
1772: */
1773: struct mbuf *
1.211 perry 1774: ip_srcroute(void)
1.1 cgd 1775: {
1.109 augustss 1776: struct in_addr *p, *q;
1777: struct mbuf *m;
1.1 cgd 1778:
1779: if (ip_nhops == 0)
1.237 dyoung 1780: return NULL;
1.1 cgd 1781: m = m_get(M_DONTWAIT, MT_SOOPTS);
1782: if (m == 0)
1.237 dyoung 1783: return NULL;
1.1 cgd 1784:
1.164 matt 1785: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1786: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1787:
1788: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1789: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1790: OPTSIZ;
1791: #ifdef DIAGNOSTIC
1792: if (ipprintfs)
1.39 christos 1793: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1794: #endif
1795:
1796: /*
1797: * First save first hop for return route
1798: */
1799: p = &ip_srcrt.route[ip_nhops - 1];
1800: *(mtod(m, struct in_addr *)) = *p--;
1801: #ifdef DIAGNOSTIC
1802: if (ipprintfs)
1.39 christos 1803: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1804: #endif
1805:
1806: /*
1807: * Copy option fields and padding (nop) to mbuf.
1808: */
1809: ip_srcrt.nop = IPOPT_NOP;
1810: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1811: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1812: OPTSIZ);
1813: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1814: sizeof(struct in_addr) + OPTSIZ);
1815: #undef OPTSIZ
1816: /*
1817: * Record return path as an IP source route,
1818: * reversing the path (pointers are now aligned).
1819: */
1820: while (p >= ip_srcrt.route) {
1821: #ifdef DIAGNOSTIC
1822: if (ipprintfs)
1.39 christos 1823: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1824: #endif
1825: *q++ = *p--;
1826: }
1827: /*
1828: * Last hop goes to final destination.
1829: */
1830: *q = ip_srcrt.dst;
1831: #ifdef DIAGNOSTIC
1832: if (ipprintfs)
1.39 christos 1833: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1834: #endif
1835: return (m);
1836: }
1837:
1.139 matt 1838: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1839: [PRC_MSGSIZE] = EMSGSIZE,
1840: [PRC_HOSTDEAD] = EHOSTDOWN,
1841: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1842: [PRC_UNREACH_NET] = EHOSTUNREACH,
1843: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1844: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1845: [PRC_UNREACH_PORT] = ECONNREFUSED,
1846: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1847: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1848: };
1849:
1850: /*
1851: * Forward a packet. If some error occurs return the sender
1852: * an icmp packet. Note we can't always generate a meaningful
1853: * icmp message because icmp doesn't have a large enough repertoire
1854: * of codes and types.
1855: *
1856: * If not forwarding, just drop the packet. This could be confusing
1857: * if ipforwarding was zero but some routing protocol was advancing
1858: * us as a gateway to somewhere. However, we must let the routing
1859: * protocol deal with that.
1860: *
1861: * The srcrt parameter indicates whether the packet is being forwarded
1862: * via a source route.
1863: */
1.13 mycroft 1864: void
1.211 perry 1865: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1866: {
1.109 augustss 1867: struct ip *ip = mtod(m, struct ip *);
1868: struct rtentry *rt;
1.220 christos 1869: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1870: struct mbuf *mcopy;
1.13 mycroft 1871: n_long dest;
1.249 dyoung 1872: union {
1873: struct sockaddr dst;
1874: struct sockaddr_in dst4;
1875: } u;
1.164 matt 1876:
1877: /*
1878: * We are now in the output path.
1879: */
1880: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1881:
1882: /*
1883: * Clear any in-bound checksum flags for this packet.
1884: */
1885: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1886:
1.13 mycroft 1887: dest = 0;
1.1 cgd 1888: #ifdef DIAGNOSTIC
1.224 joerg 1889: if (ipprintfs) {
1890: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1891: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1892: }
1.1 cgd 1893: #endif
1.93 sommerfe 1894: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1895: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1896: m_freem(m);
1897: return;
1898: }
1899: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1900: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1901: return;
1902: }
1903:
1.249 dyoung 1904: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1905: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1906: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1907: return;
1.1 cgd 1908: }
1909:
1910: /*
1.34 mycroft 1911: * Save at most 68 bytes of the packet in case
1.1 cgd 1912: * we need to generate an ICMP message to the src.
1.119 itojun 1913: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1914: */
1.155 itojun 1915: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1916: if (mcopy)
1917: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1918:
1.221 christos 1919: ip->ip_ttl -= IPTTLDEC;
1920:
1.1 cgd 1921: /*
1922: * If forwarding packet using same interface that it came in on,
1923: * perhaps should send a redirect to sender to shortcut a hop.
1924: * Only send redirect if source is sending directly to us,
1925: * and if packet was not source routed (or has any options).
1926: * Also, don't send redirect if forwarding using a default route
1927: * or a route modified by a redirect.
1928: */
1929: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1930: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1931: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1932: ipsendredirects && !srcrt) {
1.19 mycroft 1933: if (rt->rt_ifa &&
1934: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1935: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1936: if (rt->rt_flags & RTF_GATEWAY)
1937: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1938: else
1939: dest = ip->ip_dst.s_addr;
1940: /*
1941: * Router requirements says to only send host
1942: * redirects.
1943: */
1944: type = ICMP_REDIRECT;
1945: code = ICMP_REDIRECT_HOST;
1.1 cgd 1946: #ifdef DIAGNOSTIC
1.77 thorpej 1947: if (ipprintfs)
1948: printf("redirect (%d) to %x\n", code,
1949: (u_int32_t)dest);
1.1 cgd 1950: #endif
1951: }
1952: }
1953:
1.238 dyoung 1954: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1955: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1956: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1957:
1.1 cgd 1958: if (error)
1.266 thorpej 1959: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1960: else {
1.266 thorpej 1961: uint64_t *ips = IP_STAT_GETREF();
1962: ips[IP_STAT_FORWARD]++;
1963: if (type) {
1964: ips[IP_STAT_REDIRECTSENT]++;
1965: IP_STAT_PUTREF();
1966: } else {
1967: IP_STAT_PUTREF();
1.63 matt 1968: if (mcopy) {
1969: #ifdef GATEWAY
1.64 thorpej 1970: if (mcopy->m_flags & M_CANFASTFWD)
1971: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1972: #endif
1.1 cgd 1973: m_freem(mcopy);
1.63 matt 1974: }
1.1 cgd 1975: return;
1976: }
1977: }
1978: if (mcopy == NULL)
1979: return;
1.13 mycroft 1980:
1.1 cgd 1981: switch (error) {
1982:
1983: case 0: /* forwarded, but need redirect */
1984: /* type, code set above */
1985: break;
1986:
1987: case ENETUNREACH: /* shouldn't happen, checked above */
1988: case EHOSTUNREACH:
1989: case ENETDOWN:
1990: case EHOSTDOWN:
1991: default:
1992: type = ICMP_UNREACH;
1993: code = ICMP_UNREACH_HOST;
1994: break;
1995:
1996: case EMSGSIZE:
1997: type = ICMP_UNREACH;
1998: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1999:
1.274 seanb 2000: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
2001: destmtu = rt->rt_ifp->if_mtu;
1.263 cube 2002:
2003: #if defined(IPSEC) || defined(FAST_IPSEC)
1.274 seanb 2004: {
1.263 cube 2005: /*
2006: * If the packet is routed over IPsec tunnel, tell the
2007: * originator the tunnel MTU.
2008: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2009: * XXX quickhack!!!
2010: */
2011:
1.89 itojun 2012: struct secpolicy *sp;
2013: int ipsecerror;
1.95 itojun 2014: size_t ipsechdr;
1.89 itojun 2015: struct route *ro;
2016:
2017: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 2018: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
2019: &ipsecerror);
1.89 itojun 2020:
1.263 cube 2021: if (sp != NULL) {
1.89 itojun 2022: /* count IPsec header size */
1.95 itojun 2023: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 2024: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 2025:
2026: /*
2027: * find the correct route for outer IPv4
2028: * header, compute tunnel MTU.
2029: */
1.220 christos 2030:
1.89 itojun 2031: if (sp->req != NULL
1.95 itojun 2032: && sp->req->sav != NULL
2033: && sp->req->sav->sah != NULL) {
2034: ro = &sp->req->sav->sah->sa_route;
1.274 seanb 2035: rt = rtcache_validate(ro);
1.257 dyoung 2036: if (rt && rt->rt_ifp) {
1.220 christos 2037: destmtu =
1.257 dyoung 2038: rt->rt_rmx.rmx_mtu ?
2039: rt->rt_rmx.rmx_mtu :
2040: rt->rt_ifp->if_mtu;
1.220 christos 2041: destmtu -= ipsechdr;
1.89 itojun 2042: }
2043: }
2044:
1.173 jonathan 2045: #ifdef IPSEC
1.89 itojun 2046: key_freesp(sp);
1.173 jonathan 2047: #else
2048: KEY_FREESP(&sp);
2049: #endif
1.89 itojun 2050: }
1.274 seanb 2051: }
1.263 cube 2052: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.266 thorpej 2053: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 2054: break;
2055:
2056: case ENOBUFS:
1.143 itojun 2057: #if 1
2058: /*
2059: * a router should not generate ICMP_SOURCEQUENCH as
2060: * required in RFC1812 Requirements for IP Version 4 Routers.
2061: * source quench could be a big problem under DoS attacks,
1.149 wiz 2062: * or if the underlying interface is rate-limited.
1.143 itojun 2063: */
2064: if (mcopy)
2065: m_freem(mcopy);
2066: return;
2067: #else
1.1 cgd 2068: type = ICMP_SOURCEQUENCH;
2069: code = 0;
2070: break;
1.143 itojun 2071: #endif
1.1 cgd 2072: }
1.220 christos 2073: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2074: }
2075:
2076: void
1.211 perry 2077: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2078: struct mbuf *m)
1.44 thorpej 2079: {
2080:
1.283 minskim 2081: if (inp->inp_socket->so_options & SO_TIMESTAMP
1.278 christos 2082: #ifdef SO_OTIMESTAMP
1.283 minskim 2083: || inp->inp_socket->so_options & SO_OTIMESTAMP
1.278 christos 2084: #endif
2085: ) {
1.44 thorpej 2086: struct timeval tv;
2087:
2088: microtime(&tv);
1.278 christos 2089: #ifdef SO_OTIMESTAMP
2090: if (inp->inp_socket->so_options & SO_OTIMESTAMP) {
2091: struct timeval50 tv50;
2092: timeval_to_timeval50(&tv, &tv50);
2093: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
2094: SCM_OTIMESTAMP, SOL_SOCKET);
2095: } else
2096: #endif
1.244 christos 2097: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2098: SCM_TIMESTAMP, SOL_SOCKET);
2099: if (*mp)
2100: mp = &(*mp)->m_next;
2101: }
2102: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2103: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2104: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2105: if (*mp)
2106: mp = &(*mp)->m_next;
2107: }
2108: #ifdef notyet
2109: /*
2110: * XXX
2111: * Moving these out of udp_input() made them even more broken
2112: * than they already were.
2113: * - fenner@parc.xerox.com
2114: */
2115: /* options were tossed already */
2116: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2117: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2118: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2119: if (*mp)
2120: mp = &(*mp)->m_next;
2121: }
2122: /* ip_srcroute doesn't do what we want here, need to fix */
2123: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2124: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2125: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2126: if (*mp)
2127: mp = &(*mp)->m_next;
2128: }
2129: #endif
2130: if (inp->inp_flags & INP_RECVIF) {
2131: struct sockaddr_dl sdl;
2132:
1.252 dyoung 2133: sockaddr_dl_init(&sdl, sizeof(sdl),
2134: (m->m_pkthdr.rcvif != NULL)
2135: ? m->m_pkthdr.rcvif->if_index
2136: : 0,
2137: 0, NULL, 0, NULL, 0);
1.251 dyoung 2138: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2139: if (*mp)
2140: mp = &(*mp)->m_next;
2141: }
1.282 minskim 2142: if (inp->inp_flags & INP_RECVTTL) {
2143: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
2144: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
2145: if (*mp)
2146: mp = &(*mp)->m_next;
2147: }
1.13 mycroft 2148: }
2149:
1.189 atatat 2150: /*
1.228 elad 2151: * sysctl helper routine for net.inet.ip.forwsrcrt.
2152: */
2153: static int
2154: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2155: {
2156: int error, tmp;
2157: struct sysctlnode node;
2158:
2159: node = *rnode;
2160: tmp = ip_forwsrcrt;
2161: node.sysctl_data = &tmp;
2162: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2163: if (error || newp == NULL)
2164: return (error);
2165:
1.280 elad 2166: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
2167: 0, NULL, NULL, NULL);
2168: if (error)
2169: return (error);
1.228 elad 2170:
2171: ip_forwsrcrt = tmp;
2172:
2173: return (0);
2174: }
2175:
2176: /*
1.189 atatat 2177: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2178: * range of the new value and tweaks timers if it changes.
2179: */
2180: static int
2181: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2182: {
1.189 atatat 2183: int error, tmp;
2184: struct sysctlnode node;
2185:
2186: node = *rnode;
2187: tmp = ip_mtudisc_timeout;
2188: node.sysctl_data = &tmp;
2189: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2190: if (error || newp == NULL)
2191: return (error);
2192: if (tmp < 0)
2193: return (EINVAL);
1.52 thorpej 2194:
1.273 matt 2195: mutex_enter(softnet_lock);
2196:
1.189 atatat 2197: ip_mtudisc_timeout = tmp;
2198: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2199:
1.273 matt 2200: mutex_exit(softnet_lock);
2201:
1.189 atatat 2202: return (0);
2203: }
1.54 lukem 2204:
1.65 matt 2205: #ifdef GATEWAY
1.189 atatat 2206: /*
1.247 liamjfoy 2207: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 2208: */
2209: static int
2210: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2211: {
1.273 matt 2212: int error;
1.67 thorpej 2213:
1.273 matt 2214: error = sysctl_lookup(SYSCTLFN_CALL(rnode));
2215: if (error || newp == NULL)
2216: return (error);
2217:
2218: mutex_enter(softnet_lock);
2219: KERNEL_LOCK(1, NULL);
1.212 perry 2220:
1.265 thorpej 2221: ipflow_prune();
1.273 matt 2222:
2223: KERNEL_UNLOCK_ONE(NULL);
2224: mutex_exit(softnet_lock);
1.144 martin 2225:
1.189 atatat 2226: return (0);
2227: }
1.248 liamjfoy 2228:
2229: static int
2230: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
1.283 minskim 2231: {
1.248 liamjfoy 2232: int error, tmp;
2233: struct sysctlnode node;
2234:
2235: node = *rnode;
2236: tmp = ip_hashsize;
2237: node.sysctl_data = &tmp;
2238: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2239: if (error || newp == NULL)
2240: return (error);
2241:
2242: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2243: /*
2244: * Can only fail due to malloc()
2245: */
1.273 matt 2246: mutex_enter(softnet_lock);
2247: KERNEL_LOCK(1, NULL);
2248:
2249: error = ipflow_invalidate_all(tmp);
2250:
2251: KERNEL_UNLOCK_ONE(NULL);
2252: mutex_exit(softnet_lock);
2253:
1.248 liamjfoy 2254: } else {
2255: /*
2256: * EINVAL if not a power of 2
2257: */
1.273 matt 2258: error = EINVAL;
1.283 minskim 2259: }
1.248 liamjfoy 2260:
1.273 matt 2261: return error;
1.248 liamjfoy 2262: }
1.189 atatat 2263: #endif /* GATEWAY */
1.117 tron 2264:
1.266 thorpej 2265: static int
2266: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
2267: {
2268:
1.271 thorpej 2269: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 2270: }
1.131 itojun 2271:
1.284 pooka 2272: static void
2273: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 2274: {
2275: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2276:
1.197 atatat 2277: sysctl_createv(clog, 0, NULL, NULL,
2278: CTLFLAG_PERMANENT,
1.189 atatat 2279: CTLTYPE_NODE, "net", NULL,
2280: NULL, 0, NULL, 0,
2281: CTL_NET, CTL_EOL);
1.197 atatat 2282: sysctl_createv(clog, 0, NULL, NULL,
2283: CTLFLAG_PERMANENT,
1.203 atatat 2284: CTLTYPE_NODE, "inet",
2285: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2286: NULL, 0, NULL, 0,
2287: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2288: sysctl_createv(clog, 0, NULL, NULL,
2289: CTLFLAG_PERMANENT,
1.203 atatat 2290: CTLTYPE_NODE, "ip",
2291: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2292: NULL, 0, NULL, 0,
2293: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2294:
1.197 atatat 2295: sysctl_createv(clog, 0, NULL, NULL,
2296: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2297: CTLTYPE_INT, "forwarding",
2298: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2299: NULL, 0, &ipforwarding, 0,
2300: CTL_NET, PF_INET, IPPROTO_IP,
2301: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2302: sysctl_createv(clog, 0, NULL, NULL,
2303: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2304: CTLTYPE_INT, "redirect",
2305: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2306: NULL, 0, &ipsendredirects, 0,
2307: CTL_NET, PF_INET, IPPROTO_IP,
2308: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2309: sysctl_createv(clog, 0, NULL, NULL,
2310: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2311: CTLTYPE_INT, "ttl",
2312: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2313: NULL, 0, &ip_defttl, 0,
2314: CTL_NET, PF_INET, IPPROTO_IP,
2315: IPCTL_DEFTTL, CTL_EOL);
2316: #ifdef IPCTL_DEFMTU
1.197 atatat 2317: sysctl_createv(clog, 0, NULL, NULL,
2318: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2319: CTLTYPE_INT, "mtu",
2320: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2321: NULL, 0, &ip_mtu, 0,
2322: CTL_NET, PF_INET, IPPROTO_IP,
2323: IPCTL_DEFMTU, CTL_EOL);
2324: #endif /* IPCTL_DEFMTU */
1.197 atatat 2325: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2326: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2327: CTLTYPE_INT, "forwsrcrt",
2328: SYSCTL_DESCR("Enable forwarding of source-routed "
2329: "datagrams"),
1.228 elad 2330: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2331: CTL_NET, PF_INET, IPPROTO_IP,
2332: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2333: sysctl_createv(clog, 0, NULL, NULL,
2334: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2335: CTLTYPE_INT, "directed-broadcast",
2336: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2337: NULL, 0, &ip_directedbcast, 0,
2338: CTL_NET, PF_INET, IPPROTO_IP,
2339: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2340: sysctl_createv(clog, 0, NULL, NULL,
2341: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2342: CTLTYPE_INT, "allowsrcrt",
2343: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2344: NULL, 0, &ip_allowsrcrt, 0,
2345: CTL_NET, PF_INET, IPPROTO_IP,
2346: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2347: sysctl_createv(clog, 0, NULL, NULL,
2348: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2349: CTLTYPE_INT, "subnetsarelocal",
2350: SYSCTL_DESCR("Whether logical subnets are considered "
2351: "local"),
1.189 atatat 2352: NULL, 0, &subnetsarelocal, 0,
2353: CTL_NET, PF_INET, IPPROTO_IP,
2354: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2355: sysctl_createv(clog, 0, NULL, NULL,
2356: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2357: CTLTYPE_INT, "mtudisc",
2358: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2359: NULL, 0, &ip_mtudisc, 0,
2360: CTL_NET, PF_INET, IPPROTO_IP,
2361: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2362: sysctl_createv(clog, 0, NULL, NULL,
2363: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2364: CTLTYPE_INT, "anonportmin",
2365: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2366: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2367: CTL_NET, PF_INET, IPPROTO_IP,
2368: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2369: sysctl_createv(clog, 0, NULL, NULL,
2370: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2371: CTLTYPE_INT, "anonportmax",
2372: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2373: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2374: CTL_NET, PF_INET, IPPROTO_IP,
2375: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2376: sysctl_createv(clog, 0, NULL, NULL,
2377: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2378: CTLTYPE_INT, "mtudisctimeout",
2379: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2380: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2381: CTL_NET, PF_INET, IPPROTO_IP,
2382: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2383: #ifdef GATEWAY
1.197 atatat 2384: sysctl_createv(clog, 0, NULL, NULL,
2385: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2386: CTLTYPE_INT, "maxflows",
2387: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2388: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2389: CTL_NET, PF_INET, IPPROTO_IP,
2390: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2391: sysctl_createv(clog, 0, NULL, NULL,
2392: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2393: CTLTYPE_INT, "hashsize",
2394: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2395: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2396: CTL_NET, PF_INET, IPPROTO_IP,
2397: CTL_CREATE, CTL_EOL);
1.189 atatat 2398: #endif /* GATEWAY */
1.197 atatat 2399: sysctl_createv(clog, 0, NULL, NULL,
2400: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2401: CTLTYPE_INT, "hostzerobroadcast",
2402: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2403: NULL, 0, &hostzeroisbroadcast, 0,
2404: CTL_NET, PF_INET, IPPROTO_IP,
2405: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2406: #if NGIF > 0
1.197 atatat 2407: sysctl_createv(clog, 0, NULL, NULL,
2408: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2409: CTLTYPE_INT, "gifttl",
2410: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2411: NULL, 0, &ip_gif_ttl, 0,
2412: CTL_NET, PF_INET, IPPROTO_IP,
2413: IPCTL_GIF_TTL, CTL_EOL);
2414: #endif /* NGIF */
2415: #ifndef IPNOPRIVPORTS
1.197 atatat 2416: sysctl_createv(clog, 0, NULL, NULL,
2417: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2418: CTLTYPE_INT, "lowportmin",
2419: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2420: "to assign"),
1.189 atatat 2421: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2422: CTL_NET, PF_INET, IPPROTO_IP,
2423: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2424: sysctl_createv(clog, 0, NULL, NULL,
2425: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2426: CTLTYPE_INT, "lowportmax",
2427: SYSCTL_DESCR("Highest privileged ephemeral port number "
2428: "to assign"),
1.189 atatat 2429: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2430: CTL_NET, PF_INET, IPPROTO_IP,
2431: IPCTL_LOWPORTMAX, CTL_EOL);
2432: #endif /* IPNOPRIVPORTS */
1.197 atatat 2433: sysctl_createv(clog, 0, NULL, NULL,
2434: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2435: CTLTYPE_INT, "maxfragpackets",
2436: SYSCTL_DESCR("Maximum number of fragments to retain for "
2437: "possible reassembly"),
1.189 atatat 2438: NULL, 0, &ip_maxfragpackets, 0,
2439: CTL_NET, PF_INET, IPPROTO_IP,
2440: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2441: #if NGRE > 0
1.197 atatat 2442: sysctl_createv(clog, 0, NULL, NULL,
2443: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2444: CTLTYPE_INT, "grettl",
2445: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2446: NULL, 0, &ip_gre_ttl, 0,
2447: CTL_NET, PF_INET, IPPROTO_IP,
2448: IPCTL_GRE_TTL, CTL_EOL);
2449: #endif /* NGRE */
1.197 atatat 2450: sysctl_createv(clog, 0, NULL, NULL,
2451: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2452: CTLTYPE_INT, "checkinterface",
2453: SYSCTL_DESCR("Enable receive side of Strong ES model "
2454: "from RFC1122"),
1.189 atatat 2455: NULL, 0, &ip_checkinterface, 0,
2456: CTL_NET, PF_INET, IPPROTO_IP,
2457: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2458: sysctl_createv(clog, 0, NULL, NULL,
2459: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2460: CTLTYPE_INT, "random_id",
2461: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2462: NULL, 0, &ip_do_randomid, 0,
2463: CTL_NET, PF_INET, IPPROTO_IP,
2464: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2465: sysctl_createv(clog, 0, NULL, NULL,
2466: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2467: CTLTYPE_INT, "do_loopback_cksum",
2468: SYSCTL_DESCR("Perform IP checksum on loopback"),
2469: NULL, 0, &ip_do_loopback_cksum, 0,
2470: CTL_NET, PF_INET, IPPROTO_IP,
2471: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2472: sysctl_createv(clog, 0, NULL, NULL,
2473: CTLFLAG_PERMANENT,
2474: CTLTYPE_STRUCT, "stats",
2475: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 2476: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 2477: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2478: CTL_EOL);
1.1 cgd 2479: }
1.266 thorpej 2480:
2481: void
2482: ip_statinc(u_int stat)
2483: {
2484:
2485: KASSERT(stat < IP_NSTATS);
2486: IP_STATINC(stat);
2487: }
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