Annotation of src/sys/netinet/ip_input.c, Revision 1.268
1.268 ! ad 1: /* $NetBSD: ip_input.c,v 1.267 2008/04/23 06:09:04 thorpej 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: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
1.172 agc 81: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 82: * may be used to endorse or promote products derived from this software
83: * without specific prior written permission.
84: *
85: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
86: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
87: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
88: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
89: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
90: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
91: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
92: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
93: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
94: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
95: * SUCH DAMAGE.
96: *
1.14 cgd 97: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 98: */
1.141 lukem 99:
100: #include <sys/cdefs.h>
1.268 ! ad 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.267 2008/04/23 06:09:04 thorpej Exp $");
1.55 scottr 102:
1.184 jonathan 103: #include "opt_inet.h"
1.62 matt 104: #include "opt_gateway.h"
1.69 mrg 105: #include "opt_pfil_hooks.h"
1.91 thorpej 106: #include "opt_ipsec.h"
1.55 scottr 107: #include "opt_mrouting.h"
1.167 martin 108: #include "opt_mbuftrace.h"
1.135 thorpej 109: #include "opt_inet_csum.h"
1.1 cgd 110:
1.5 mycroft 111: #include <sys/param.h>
112: #include <sys/systm.h>
113: #include <sys/malloc.h>
114: #include <sys/mbuf.h>
115: #include <sys/domain.h>
116: #include <sys/protosw.h>
117: #include <sys/socket.h>
1.44 thorpej 118: #include <sys/socketvar.h>
1.5 mycroft 119: #include <sys/errno.h>
120: #include <sys/time.h>
121: #include <sys/kernel.h>
1.72 thorpej 122: #include <sys/pool.h>
1.28 christos 123: #include <sys/sysctl.h>
1.230 elad 124: #include <sys/kauth.h>
1.1 cgd 125:
1.5 mycroft 126: #include <net/if.h>
1.44 thorpej 127: #include <net/if_dl.h>
1.5 mycroft 128: #include <net/route.h>
1.45 mrg 129: #include <net/pfil.h>
1.1 cgd 130:
1.5 mycroft 131: #include <netinet/in.h>
132: #include <netinet/in_systm.h>
133: #include <netinet/ip.h>
134: #include <netinet/in_pcb.h>
1.215 yamt 135: #include <netinet/in_proto.h>
1.5 mycroft 136: #include <netinet/in_var.h>
137: #include <netinet/ip_var.h>
1.266 thorpej 138: #include <netinet/ip_private.h>
1.5 mycroft 139: #include <netinet/ip_icmp.h>
1.89 itojun 140: /* just for gif_ttl */
141: #include <netinet/in_gif.h>
142: #include "gif.h"
1.144 martin 143: #include <net/if_gre.h>
144: #include "gre.h"
1.111 jdolecek 145:
146: #ifdef MROUTING
147: #include <netinet/ip_mroute.h>
148: #endif
1.89 itojun 149:
150: #ifdef IPSEC
151: #include <netinet6/ipsec.h>
1.267 thorpej 152: #include <netinet6/ipsec_private.h>
1.89 itojun 153: #include <netkey/key.h>
154: #endif
1.173 jonathan 155: #ifdef FAST_IPSEC
156: #include <netipsec/ipsec.h>
157: #include <netipsec/key.h>
158: #endif /* FAST_IPSEC*/
1.44 thorpej 159:
1.1 cgd 160: #ifndef IPFORWARDING
161: #ifdef GATEWAY
162: #define IPFORWARDING 1 /* forward IP packets not for us */
163: #else /* GATEWAY */
164: #define IPFORWARDING 0 /* don't forward IP packets not for us */
165: #endif /* GATEWAY */
166: #endif /* IPFORWARDING */
167: #ifndef IPSENDREDIRECTS
168: #define IPSENDREDIRECTS 1
169: #endif
1.26 thorpej 170: #ifndef IPFORWSRCRT
1.47 cjs 171: #define IPFORWSRCRT 1 /* forward source-routed packets */
172: #endif
173: #ifndef IPALLOWSRCRT
1.48 mrg 174: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 175: #endif
1.53 kml 176: #ifndef IPMTUDISC
1.153 itojun 177: #define IPMTUDISC 1
1.53 kml 178: #endif
1.60 kml 179: #ifndef IPMTUDISCTIMEOUT
1.61 kml 180: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 181: #endif
1.53 kml 182:
1.27 thorpej 183: /*
184: * Note: DIRECTED_BROADCAST is handled this way so that previous
185: * configuration using this option will Just Work.
186: */
187: #ifndef IPDIRECTEDBCAST
188: #ifdef DIRECTED_BROADCAST
189: #define IPDIRECTEDBCAST 1
190: #else
191: #define IPDIRECTEDBCAST 0
192: #endif /* DIRECTED_BROADCAST */
193: #endif /* IPDIRECTEDBCAST */
1.1 cgd 194: int ipforwarding = IPFORWARDING;
195: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 196: int ip_defttl = IPDEFTTL;
1.26 thorpej 197: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 198: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 199: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 200: int ip_mtudisc = IPMTUDISC;
1.156 itojun 201: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 202: #ifdef DIAGNOSTIC
203: int ipprintfs = 0;
204: #endif
1.184 jonathan 205:
206: int ip_do_randomid = 0;
207:
1.165 christos 208: /*
209: * XXX - Setting ip_checkinterface mostly implements the receive side of
210: * the Strong ES model described in RFC 1122, but since the routing table
211: * and transmit implementation do not implement the Strong ES model,
212: * setting this to 1 results in an odd hybrid.
213: *
214: * XXX - ip_checkinterface currently must be disabled if you use ipnat
215: * to translate the destination address to another local interface.
216: *
217: * XXX - ip_checkinterface must be disabled if you add IP aliases
218: * to the loopback interface instead of the interface where the
219: * packets for those addresses are received.
220: */
221: int ip_checkinterface = 0;
222:
1.1 cgd 223:
1.60 kml 224: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
225:
1.1 cgd 226: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 227: u_long in_ifaddrhash; /* size of hash table - 1 */
228: int in_ifaddrentries; /* total number of addrs */
1.212 perry 229: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 230: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 231: u_long in_multihash; /* size of hash table - 1 */
232: int in_multientries; /* total number of addrs */
233: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 234: struct ifqueue ipintrq;
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:
1.246 ad 340: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
341: IPL_SOFTNET);
342: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
343: IPL_VM);
1.72 thorpej 344:
1.135 thorpej 345: #ifdef INET_CSUM_COUNTERS
346: #include <sys/device.h>
347:
348: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
349: NULL, "inet", "hwcsum bad");
350: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
351: NULL, "inet", "hwcsum ok");
352: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
353: NULL, "inet", "swcsum");
354:
355: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
356:
1.201 matt 357: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
358: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
359: EVCNT_ATTACH_STATIC(ip_swcsum);
360:
1.135 thorpej 361: #else
362:
363: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
364:
365: #endif /* INET_CSUM_COUNTERS */
366:
1.1 cgd 367: /*
368: * We need to save the IP options in case a protocol wants to respond
369: * to an incoming packet over the same route if the packet got here
370: * using IP source routing. This allows connection establishment and
371: * maintenance when the remote end is on a network that is not known
372: * to us.
373: */
374: int ip_nhops = 0;
375: static struct ip_srcrt {
376: struct in_addr dst; /* final destination */
377: char nop; /* one NOP to align */
378: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
379: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
380: } ip_srcrt;
381:
1.210 perry 382: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 383:
1.164 matt 384: #ifdef MBUFTRACE
1.234 dogcow 385: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
386: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 387: #endif
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:
409: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
410: if (pr == 0)
411: panic("ip_init");
412: for (i = 0; i < IPPROTO_MAX; i++)
413: ip_protox[i] = pr - inetsw;
414: for (pr = inetdomain.dom_protosw;
415: pr < inetdomain.dom_protoswNPROTOSW; pr++)
416: if (pr->pr_domain->dom_family == PF_INET &&
417: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
418: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 419:
1.190 jonathan 420: for (i = 0; i < IPREASS_NHASH; i++)
421: LIST_INIT(&ipq[i]);
422:
1.262 matt 423: ip_initid();
1.227 kardel 424: ip_id = time_second & 0xfffff;
1.194 jonathan 425:
1.1 cgd 426: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 427: ip_nmbclusters_changed();
428:
1.181 jonathan 429: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 430: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
431: M_WAITOK, &in_ifaddrhash);
1.166 matt 432: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
433: M_WAITOK, &in_multihash);
1.160 itojun 434: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 435: #ifdef GATEWAY
1.248 liamjfoy 436: ipflow_init(ip_hashsize);
1.73 thorpej 437: #endif
1.121 thorpej 438:
439: #ifdef PFIL_HOOKS
440: /* Register our Packet Filter hook. */
1.126 thorpej 441: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
442: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 443: i = pfil_head_register(&inet_pfil_hook);
444: if (i != 0)
445: printf("ip_init: WARNING: unable to register pfil hook, "
446: "error %d\n", i);
447: #endif /* PFIL_HOOKS */
1.135 thorpej 448:
1.164 matt 449: #ifdef MBUFTRACE
450: MOWNER_ATTACH(&ip_tx_mowner);
451: MOWNER_ATTACH(&ip_rx_mowner);
452: #endif /* MBUFTRACE */
1.266 thorpej 453:
454: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 455: }
456:
1.229 christos 457: struct sockaddr_in ipaddr = {
458: .sin_len = sizeof(ipaddr),
459: .sin_family = AF_INET,
460: };
1.1 cgd 461: struct route ipforward_rt;
462:
463: /*
1.89 itojun 464: * IP software interrupt routine
465: */
466: void
1.211 perry 467: ipintr(void)
1.89 itojun 468: {
469: int s;
470: struct mbuf *m;
471:
1.268 ! ad 472: mutex_enter(softnet_lock);
! 473: KERNEL_LOCK(1, NULL);
1.241 ad 474: while (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 475: s = splnet();
1.89 itojun 476: IF_DEQUEUE(&ipintrq, m);
477: splx(s);
1.268 ! ad 478: if (m == NULL)
! 479: break;
1.89 itojun 480: ip_input(m);
481: }
1.268 ! ad 482: KERNEL_UNLOCK_ONE(NULL);
! 483: mutex_exit(softnet_lock);
1.89 itojun 484: }
485:
486: /*
1.1 cgd 487: * Ip input routine. Checksum and byte swap header. If fragmented
488: * try to reassemble. Process options. Pass to next level.
489: */
1.8 mycroft 490: void
1.89 itojun 491: ip_input(struct mbuf *m)
1.1 cgd 492: {
1.109 augustss 493: struct ip *ip = NULL;
494: struct ipq *fp;
495: struct in_ifaddr *ia;
496: struct ifaddr *ifa;
1.25 cgd 497: struct ipqent *ipqe;
1.89 itojun 498: int hlen = 0, mff, len;
1.100 itojun 499: int downmatch;
1.165 christos 500: int checkif;
1.169 itojun 501: int srcrt = 0;
1.233 tls 502: int s;
1.190 jonathan 503: u_int hash;
1.173 jonathan 504: #ifdef FAST_IPSEC
505: struct m_tag *mtag;
506: struct tdb_ident *tdbi;
507: struct secpolicy *sp;
1.233 tls 508: int error;
1.173 jonathan 509: #endif /* FAST_IPSEC */
1.1 cgd 510:
1.164 matt 511: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 512: #ifdef DIAGNOSTIC
513: if ((m->m_flags & M_PKTHDR) == 0)
514: panic("ipintr no HDR");
1.89 itojun 515: #endif
1.164 matt 516:
1.1 cgd 517: /*
518: * If no IP addresses have been set yet but the interfaces
519: * are receiving, can't do anything with incoming packets yet.
520: */
1.181 jonathan 521: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 522: goto bad;
1.266 thorpej 523: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 524: /*
525: * If the IP header is not aligned, slurp it up into a new
526: * mbuf with space for link headers, in the event we forward
527: * it. Otherwise, if it is aligned, make sure the entire
528: * base IP header is in the first mbuf of the chain.
529: */
1.244 christos 530: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 531: if ((m = m_copyup(m, sizeof(struct ip),
532: (max_linkhdr + 3) & ~3)) == NULL) {
533: /* XXXJRT new stat, please */
1.266 thorpej 534: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 535: return;
536: }
537: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
538: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 539: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 540: return;
541: }
1.1 cgd 542: }
543: ip = mtod(m, struct ip *);
1.13 mycroft 544: if (ip->ip_v != IPVERSION) {
1.266 thorpej 545: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 546: goto bad;
547: }
1.1 cgd 548: hlen = ip->ip_hl << 2;
549: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 550: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 551: goto bad;
552: }
553: if (hlen > m->m_len) {
554: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 555: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 556: return;
1.1 cgd 557: }
558: ip = mtod(m, struct ip *);
559: }
1.98 thorpej 560:
1.85 hwr 561: /*
1.99 thorpej 562: * RFC1122: packets with a multicast source address are
1.98 thorpej 563: * not allowed.
1.85 hwr 564: */
565: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 566: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 567: goto bad;
1.129 itojun 568: }
569:
570: /* 127/8 must not appear on wire - RFC1122 */
571: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
572: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 573: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 574: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 575: goto bad;
1.130 itojun 576: }
1.85 hwr 577: }
578:
1.135 thorpej 579: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 580: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 581: M_CSUM_IPv4_BAD)) {
582: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
583: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
584: goto badcsum;
585:
586: case M_CSUM_IPv4:
587: /* Checksum was okay. */
588: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
589: break;
590:
591: default:
1.206 thorpej 592: /*
593: * Must compute it ourselves. Maybe skip checksum on
594: * loopback interfaces.
595: */
596: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
597: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
598: INET_CSUM_COUNTER_INCR(&ip_swcsum);
599: if (in_cksum(m, hlen) != 0)
600: goto badcsum;
601: }
1.135 thorpej 602: break;
1.1 cgd 603: }
604:
1.121 thorpej 605: /* Retrieve the packet length. */
606: len = ntohs(ip->ip_len);
1.81 proff 607:
608: /*
609: * Check for additional length bogosity
610: */
1.84 proff 611: if (len < hlen) {
1.266 thorpej 612: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 613: goto bad;
614: }
1.1 cgd 615:
616: /*
617: * Check that the amount of data in the buffers
618: * is as at least much as the IP header would have us expect.
619: * Trim mbufs if longer than we expect.
620: * Drop packet if shorter than we expect.
621: */
1.35 mycroft 622: if (m->m_pkthdr.len < len) {
1.266 thorpej 623: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 624: goto bad;
625: }
1.35 mycroft 626: if (m->m_pkthdr.len > len) {
1.1 cgd 627: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 628: m->m_len = len;
629: m->m_pkthdr.len = len;
1.1 cgd 630: } else
1.35 mycroft 631: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 632: }
633:
1.193 scw 634: #if defined(IPSEC)
1.149 wiz 635: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 636: m->m_flags &= ~M_CANFASTFWD;
637: #else
1.64 thorpej 638: /*
639: * Assume that we can create a fast-forward IP flow entry
640: * based on this packet.
641: */
642: m->m_flags |= M_CANFASTFWD;
1.94 itojun 643: #endif
1.64 thorpej 644:
1.36 mrg 645: #ifdef PFIL_HOOKS
1.33 mrg 646: /*
1.64 thorpej 647: * Run through list of hooks for input packets. If there are any
648: * filters which require that additional packets in the flow are
649: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
650: * Note that filters must _never_ set this flag, as another filter
651: * in the list may have previously cleared it.
1.33 mrg 652: */
1.127 itojun 653: /*
654: * let ipfilter look at packet on the wire,
655: * not the decapsulated packet.
656: */
657: #ifdef IPSEC
1.136 itojun 658: if (!ipsec_getnhist(m))
1.186 scw 659: #elif defined(FAST_IPSEC)
660: if (!ipsec_indone(m))
1.127 itojun 661: #else
662: if (1)
663: #endif
664: {
1.169 itojun 665: struct in_addr odst;
666:
667: odst = ip->ip_dst;
1.127 itojun 668: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 669: PFIL_IN) != 0)
670: return;
1.127 itojun 671: if (m == NULL)
672: return;
673: ip = mtod(m, struct ip *);
1.142 darrenr 674: hlen = ip->ip_hl << 2;
1.205 darrenr 675: /*
676: * XXX The setting of "srcrt" here is to prevent ip_forward()
677: * from generating ICMP redirects for packets that have
678: * been redirected by a hook back out on to the same LAN that
679: * they came from and is not an indication that the packet
680: * is being inffluenced by source routing options. This
681: * allows things like
682: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
683: * where tlp0 is both on the 1.1.1.0/24 network and is the
684: * default route for hosts on 1.1.1.0/24. Of course this
685: * also requires a "map tlp0 ..." to complete the story.
686: * One might argue whether or not this kind of network config.
1.212 perry 687: * should be supported in this manner...
1.205 darrenr 688: */
1.169 itojun 689: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 690: }
1.36 mrg 691: #endif /* PFIL_HOOKS */
1.123 thorpej 692:
693: #ifdef ALTQ
694: /* XXX Temporary until ALTQ is changed to use a pfil hook */
695: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
696: /* packet dropped by traffic conditioner */
697: return;
698: }
699: #endif
1.121 thorpej 700:
701: /*
1.1 cgd 702: * Process options and, if not destined for us,
703: * ship it on. ip_dooptions returns 1 when an
704: * error was detected (causing an icmp message
705: * to be sent and the original packet to be freed).
706: */
707: ip_nhops = 0; /* for source routed packets */
708: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 709: return;
1.1 cgd 710:
711: /*
1.165 christos 712: * Enable a consistency check between the destination address
713: * and the arrival interface for a unicast packet (the RFC 1122
714: * strong ES model) if IP forwarding is disabled and the packet
715: * is not locally generated.
716: *
717: * XXX - Checking also should be disabled if the destination
718: * address is ipnat'ed to a different interface.
719: *
720: * XXX - Checking is incompatible with IP aliases added
721: * to the loopback interface instead of the interface where
722: * the packets are received.
723: *
724: * XXX - We need to add a per ifaddr flag for this so that
725: * we get finer grain control.
726: */
727: checkif = ip_checkinterface && (ipforwarding == 0) &&
728: (m->m_pkthdr.rcvif != NULL) &&
729: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
730:
731: /*
1.1 cgd 732: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 733: *
734: * Traditional 4.4BSD did not consult IFF_UP at all.
735: * The behavior here is to treat addresses on !IFF_UP interface
736: * as not mine.
1.1 cgd 737: */
1.100 itojun 738: downmatch = 0;
1.140 matt 739: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 740: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 741: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
742: continue;
1.97 itojun 743: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
744: break;
1.100 itojun 745: else
746: downmatch++;
1.97 itojun 747: }
748: }
1.86 thorpej 749: if (ia != NULL)
750: goto ours;
1.225 christos 751: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 752: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 753: if (ifa->ifa_addr->sa_family != AF_INET)
754: continue;
1.57 tls 755: ia = ifatoia(ifa);
1.35 mycroft 756: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
757: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 758: /*
759: * Look for all-0's host part (old broadcast addr),
760: * either for subnet or net.
761: */
762: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 763: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 764: goto ours;
1.57 tls 765: /*
766: * An interface with IP address zero accepts
767: * all packets that arrive on that interface.
768: */
769: if (in_nullhost(ia->ia_addr.sin_addr))
770: goto ours;
1.1 cgd 771: }
772: }
1.18 mycroft 773: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 774: struct in_multi *inm;
775: #ifdef MROUTING
776: extern struct socket *ip_mrouter;
1.10 brezak 777:
1.4 hpeyerl 778: if (ip_mrouter) {
779: /*
780: * If we are acting as a multicast router, all
781: * incoming multicast packets are passed to the
782: * kernel-level multicast forwarding function.
783: * The packet is returned (relatively) intact; if
784: * ip_mforward() returns a non-zero value, the packet
785: * must be discarded, else it may be accepted below.
786: *
787: * (The IP ident field is put in the same byte order
788: * as expected when ip_mforward() is called from
789: * ip_output().)
790: */
1.13 mycroft 791: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 792: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 793: m_freem(m);
1.89 itojun 794: return;
1.4 hpeyerl 795: }
796:
797: /*
798: * The process-level routing demon needs to receive
799: * all multicast IGMP packets, whether or not this
800: * host belongs to their destination groups.
801: */
802: if (ip->ip_p == IPPROTO_IGMP)
803: goto ours;
1.266 thorpej 804: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 805: }
806: #endif
807: /*
808: * See if we belong to the destination multicast group on the
809: * arrival interface.
810: */
811: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
812: if (inm == NULL) {
1.266 thorpej 813: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 814: m_freem(m);
1.89 itojun 815: return;
1.4 hpeyerl 816: }
817: goto ours;
818: }
1.19 mycroft 819: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 820: in_nullhost(ip->ip_dst))
1.1 cgd 821: goto ours;
822:
823: /*
824: * Not for us; forward if possible and desirable.
825: */
826: if (ipforwarding == 0) {
1.266 thorpej 827: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 828: m_freem(m);
1.100 itojun 829: } else {
830: /*
831: * If ip_dst matched any of my address on !IFF_UP interface,
832: * and there's no IFF_UP interface that matches ip_dst,
833: * send icmp unreach. Forwarding it will result in in-kernel
834: * forwarding loop till TTL goes to 0.
835: */
836: if (downmatch) {
837: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 838: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 839: return;
840: }
1.145 itojun 841: #ifdef IPSEC
842: if (ipsec4_in_reject(m, NULL)) {
1.267 thorpej 843: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 844: goto bad;
845: }
846: #endif
1.173 jonathan 847: #ifdef FAST_IPSEC
848: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
849: s = splsoftnet();
850: if (mtag != NULL) {
851: tdbi = (struct tdb_ident *)(mtag + 1);
852: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
853: } else {
854: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 855: IP_FORWARDING, &error);
1.173 jonathan 856: }
857: if (sp == NULL) { /* NB: can happen if error */
858: splx(s);
859: /*XXX error stat???*/
860: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
861: goto bad;
862: }
863:
864: /*
865: * Check security policy against packet attributes.
866: */
867: error = ipsec_in_reject(sp, m);
868: KEY_FREESP(&sp);
869: splx(s);
870: if (error) {
1.266 thorpej 871: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 872: goto bad;
1.193 scw 873: }
874:
875: /*
876: * Peek at the outbound SP for this packet to determine if
877: * it's a Fast Forward candidate.
878: */
879: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
880: if (mtag != NULL)
881: m->m_flags &= ~M_CANFASTFWD;
882: else {
883: s = splsoftnet();
884: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
885: (IP_FORWARDING |
886: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
887: &error, NULL);
888: if (sp != NULL) {
889: m->m_flags &= ~M_CANFASTFWD;
890: KEY_FREESP(&sp);
891: }
892: splx(s);
1.173 jonathan 893: }
894: #endif /* FAST_IPSEC */
1.145 itojun 895:
1.169 itojun 896: ip_forward(m, srcrt);
1.100 itojun 897: }
1.89 itojun 898: return;
1.1 cgd 899:
900: ours:
901: /*
902: * If offset or IP_MF are set, must reassemble.
903: * Otherwise, nothing need be done.
904: * (We could look in the reassembly queue to see
905: * if the packet was previously fragmented,
906: * but it's not worth the time; just let them time out.)
907: */
1.155 itojun 908: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258 matt 909: uint16_t off;
910: /*
911: * Prevent TCP blind data attacks by not allowing non-initial
912: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 913: * size) and making sure the first fragment is at least 68
914: * bytes.
1.258 matt 915: */
1.260 matt 916: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 917: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266 thorpej 918: IP_STATINC(IP_STAT_BADFRAGS);
1.258 matt 919: goto bad;
920: }
1.1 cgd 921: /*
922: * Look for queue of fragments
923: * of this datagram.
924: */
1.75 thorpej 925: IPQ_LOCK();
1.190 jonathan 926: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250 dyoung 927: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1 cgd 928: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 929: in_hosteq(ip->ip_src, fp->ipq_src) &&
930: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260 matt 931: ip->ip_p == fp->ipq_p) {
932: /*
933: * Make sure the TOS is matches previous
934: * fragments.
935: */
936: if (ip->ip_tos != fp->ipq_tos) {
1.266 thorpej 937: IP_STATINC(IP_STAT_BADFRAGS);
1.260 matt 938: goto bad;
939: }
1.1 cgd 940: goto found;
1.260 matt 941: }
1.190 jonathan 942: }
1.1 cgd 943: fp = 0;
944: found:
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) {
1.16 cgd 954: /*
955: * Make sure that fragments have a data length
956: * that's a non-zero multiple of 8 bytes.
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);
1.75 thorpej 961: IPQ_UNLOCK();
1.16 cgd 962: goto bad;
963: }
964: }
1.155 itojun 965: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 966:
967: /*
968: * If datagram marked as having more fragments
969: * or if this is not the first fragment,
970: * attempt reassembly; if it succeeds, proceed.
971: */
1.155 itojun 972: if (mff || ip->ip_off != htons(0)) {
1.266 thorpej 973: IP_STATINC(IP_STAT_FRAGMENTS);
1.233 tls 974: s = splvm();
1.72 thorpej 975: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 976: splx(s);
1.25 cgd 977: if (ipqe == NULL) {
1.266 thorpej 978: IP_STATINC(IP_STAT_RCVMEMDROP);
1.75 thorpej 979: IPQ_UNLOCK();
1.25 cgd 980: goto bad;
981: }
982: ipqe->ipqe_mff = mff;
1.50 thorpej 983: ipqe->ipqe_m = m;
1.25 cgd 984: ipqe->ipqe_ip = ip;
1.190 jonathan 985: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 986: if (m == 0) {
987: IPQ_UNLOCK();
1.89 itojun 988: return;
1.75 thorpej 989: }
1.266 thorpej 990: IP_STATINC(IP_STAT_REASSEMBLED);
1.50 thorpej 991: ip = mtod(m, struct ip *);
1.74 thorpej 992: hlen = ip->ip_hl << 2;
1.155 itojun 993: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 994: } else
995: if (fp)
996: ip_freef(fp);
1.75 thorpej 997: IPQ_UNLOCK();
1.79 mycroft 998: }
1.128 itojun 999:
1.173 jonathan 1000: #if defined(IPSEC)
1.128 itojun 1001: /*
1002: * enforce IPsec policy checking if we are seeing last header.
1003: * note that we do not visit this with protocols with pcb layer
1004: * code - like udp/tcp/raw ip.
1005: */
1006: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
1007: ipsec4_in_reject(m, NULL)) {
1.267 thorpej 1008: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 1009: goto bad;
1010: }
1011: #endif
1.226 liamjfoy 1012: #ifdef FAST_IPSEC
1.173 jonathan 1013: /*
1014: * enforce IPsec policy checking if we are seeing last header.
1015: * note that we do not visit this with protocols with pcb layer
1016: * code - like udp/tcp/raw ip.
1017: */
1018: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1019: /*
1020: * Check if the packet has already had IPsec processing
1021: * done. If so, then just pass it along. This tag gets
1022: * set during AH, ESP, etc. input handling, before the
1023: * packet is returned to the ip input queue for delivery.
1.212 perry 1024: */
1.173 jonathan 1025: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1026: s = splsoftnet();
1027: if (mtag != NULL) {
1028: tdbi = (struct tdb_ident *)(mtag + 1);
1029: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1030: } else {
1031: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1032: IP_FORWARDING, &error);
1.173 jonathan 1033: }
1034: if (sp != NULL) {
1035: /*
1036: * Check security policy against packet attributes.
1037: */
1038: error = ipsec_in_reject(sp, m);
1039: KEY_FREESP(&sp);
1040: } else {
1041: /* XXX error stat??? */
1042: error = EINVAL;
1043: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1044: }
1045: splx(s);
1046: if (error)
1047: goto bad;
1048: }
1049: #endif /* FAST_IPSEC */
1.1 cgd 1050:
1051: /*
1052: * Switch out to protocol's input routine.
1053: */
1.82 aidan 1054: #if IFA_STATS
1.122 itojun 1055: if (ia && ip)
1.155 itojun 1056: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1057: #endif
1.266 thorpej 1058: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 1059: {
1060: int off = hlen, nh = ip->ip_p;
1061:
1062: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1063: return;
1064: }
1.1 cgd 1065: bad:
1066: m_freem(m);
1.135 thorpej 1067: return;
1068:
1069: badcsum:
1.266 thorpej 1070: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 1071: m_freem(m);
1.1 cgd 1072: }
1073:
1074: /*
1075: * Take incoming datagram fragment and try to
1076: * reassemble it into whole datagram. If a chain for
1077: * reassembly of this datagram already exists, then it
1078: * is given as fp; otherwise have to make a chain.
1079: */
1.50 thorpej 1080: struct mbuf *
1.211 perry 1081: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1082: {
1.109 augustss 1083: struct mbuf *m = ipqe->ipqe_m;
1084: struct ipqent *nq, *p, *q;
1.25 cgd 1085: struct ip *ip;
1.1 cgd 1086: struct mbuf *t;
1.25 cgd 1087: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1088: int i, next, s;
1.1 cgd 1089:
1.75 thorpej 1090: IPQ_LOCK_CHECK();
1091:
1.1 cgd 1092: /*
1093: * Presence of header sizes in mbufs
1094: * would confuse code below.
1095: */
1096: m->m_data += hlen;
1097: m->m_len -= hlen;
1098:
1.194 jonathan 1099: #ifdef notyet
1100: /* make sure fragment limit is up-to-date */
1101: CHECK_NMBCLUSTER_PARAMS();
1102:
1103: /* If we have too many fragments, drop the older half. */
1104: if (ip_nfrags >= ip_maxfrags)
1105: ip_reass_drophalf(void);
1106: #endif
1107:
1.1 cgd 1108: /*
1.192 jonathan 1109: * We are about to add a fragment; increment frag count.
1110: */
1111: ip_nfrags++;
1.212 perry 1112:
1.192 jonathan 1113: /*
1.1 cgd 1114: * If first fragment to arrive, create a reassembly queue.
1115: */
1116: if (fp == 0) {
1.131 itojun 1117: /*
1118: * Enforce upper bound on number of fragmented packets
1119: * for which we attempt reassembly;
1120: * If maxfrag is 0, never accept fragments.
1121: * If maxfrag is -1, accept all fragments without limitation.
1122: */
1123: if (ip_maxfragpackets < 0)
1124: ;
1125: else if (ip_nfragpackets >= ip_maxfragpackets)
1126: goto dropfrag;
1127: ip_nfragpackets++;
1.50 thorpej 1128: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1129: M_FTABLE, M_NOWAIT);
1130: if (fp == NULL)
1.1 cgd 1131: goto dropfrag;
1.190 jonathan 1132: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1133: fp->ipq_nfrags = 1;
1.1 cgd 1134: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1135: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1136: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260 matt 1137: fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148 matt 1138: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1139: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1140: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1141: p = NULL;
1.1 cgd 1142: goto insert;
1.192 jonathan 1143: } else {
1144: fp->ipq_nfrags++;
1.1 cgd 1145: }
1146:
1147: /*
1148: * Find a segment which begins after this one does.
1149: */
1.148 matt 1150: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1151: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1152: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1153: break;
1154:
1155: /*
1156: * If there is a preceding segment, it may provide some of
1157: * our data already. If so, drop the data from the incoming
1158: * segment. If it provides all of our data, drop us.
1159: */
1.25 cgd 1160: if (p != NULL) {
1.155 itojun 1161: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1162: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1163: if (i > 0) {
1.155 itojun 1164: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1165: goto dropfrag;
1.50 thorpej 1166: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1167: ipqe->ipqe_ip->ip_off =
1168: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1169: ipqe->ipqe_ip->ip_len =
1170: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1171: }
1172: }
1173:
1174: /*
1175: * While we overlap succeeding segments trim them or,
1176: * if they are completely covered, dequeue them.
1177: */
1.155 itojun 1178: for (; q != NULL &&
1179: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1180: ntohs(q->ipqe_ip->ip_off); q = nq) {
1181: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1182: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1183: if (i < ntohs(q->ipqe_ip->ip_len)) {
1184: q->ipqe_ip->ip_len =
1185: htons(ntohs(q->ipqe_ip->ip_len) - i);
1186: q->ipqe_ip->ip_off =
1187: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1188: m_adj(q->ipqe_m, i);
1.1 cgd 1189: break;
1190: }
1.148 matt 1191: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1192: m_freem(q->ipqe_m);
1.148 matt 1193: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1194: s = splvm();
1.72 thorpej 1195: pool_put(&ipqent_pool, q);
1.233 tls 1196: splx(s);
1.192 jonathan 1197: fp->ipq_nfrags--;
1198: ip_nfrags--;
1.1 cgd 1199: }
1200:
1201: insert:
1202: /*
1203: * Stick new segment in its place;
1204: * check for complete reassembly.
1205: */
1.25 cgd 1206: if (p == NULL) {
1.148 matt 1207: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1208: } else {
1.148 matt 1209: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1210: }
1.1 cgd 1211: next = 0;
1.148 matt 1212: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1213: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1214: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1215: return (0);
1.155 itojun 1216: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1217: }
1.25 cgd 1218: if (p->ipqe_mff)
1.1 cgd 1219: return (0);
1220:
1221: /*
1.41 thorpej 1222: * Reassembly is complete. Check for a bogus message size and
1223: * concatenate fragments.
1.1 cgd 1224: */
1.148 matt 1225: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1226: ip = q->ipqe_ip;
1.41 thorpej 1227: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266 thorpej 1228: IP_STATINC(IP_STAT_TOOLONG);
1.41 thorpej 1229: ip_freef(fp);
1230: return (0);
1231: }
1.50 thorpej 1232: m = q->ipqe_m;
1.1 cgd 1233: t = m->m_next;
1234: m->m_next = 0;
1235: m_cat(m, t);
1.148 matt 1236: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1237: s = splvm();
1.72 thorpej 1238: pool_put(&ipqent_pool, q);
1.233 tls 1239: splx(s);
1.25 cgd 1240: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1241: t = q->ipqe_m;
1.148 matt 1242: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1243: s = splvm();
1.72 thorpej 1244: pool_put(&ipqent_pool, q);
1.233 tls 1245: splx(s);
1.1 cgd 1246: m_cat(m, t);
1247: }
1.192 jonathan 1248: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1249:
1250: /*
1251: * Create header for new ip packet by
1252: * modifying header of first packet;
1253: * dequeue and discard fragment reassembly header.
1254: * Make header visible.
1255: */
1.155 itojun 1256: ip->ip_len = htons(next);
1.25 cgd 1257: ip->ip_src = fp->ipq_src;
1258: ip->ip_dst = fp->ipq_dst;
1259: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1260: FREE(fp, M_FTABLE);
1.131 itojun 1261: ip_nfragpackets--;
1.1 cgd 1262: m->m_len += (ip->ip_hl << 2);
1263: m->m_data -= (ip->ip_hl << 2);
1264: /* some debugging cruft by sklower, below, will go away soon */
1265: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1266: int plen = 0;
1.50 thorpej 1267: for (t = m; t; t = t->m_next)
1268: plen += t->m_len;
1269: m->m_pkthdr.len = plen;
1.213 yamt 1270: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1271: }
1.50 thorpej 1272: return (m);
1.1 cgd 1273:
1274: dropfrag:
1.192 jonathan 1275: if (fp != 0)
1276: fp->ipq_nfrags--;
1277: ip_nfrags--;
1.266 thorpej 1278: IP_STATINC(IP_STAT_FRAGDROPPED);
1.1 cgd 1279: m_freem(m);
1.233 tls 1280: s = splvm();
1.72 thorpej 1281: pool_put(&ipqent_pool, ipqe);
1.233 tls 1282: splx(s);
1.1 cgd 1283: return (0);
1284: }
1285:
1286: /*
1287: * Free a fragment reassembly header and all
1288: * associated datagrams.
1289: */
1.8 mycroft 1290: void
1.211 perry 1291: ip_freef(struct ipq *fp)
1.1 cgd 1292: {
1.109 augustss 1293: struct ipqent *q, *p;
1.192 jonathan 1294: u_int nfrags = 0;
1.233 tls 1295: int s;
1.1 cgd 1296:
1.75 thorpej 1297: IPQ_LOCK_CHECK();
1298:
1.148 matt 1299: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1300: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1301: m_freem(q->ipqe_m);
1.192 jonathan 1302: nfrags++;
1.148 matt 1303: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1304: s = splvm();
1.72 thorpej 1305: pool_put(&ipqent_pool, q);
1.233 tls 1306: splx(s);
1.1 cgd 1307: }
1.192 jonathan 1308:
1309: if (nfrags != fp->ipq_nfrags)
1310: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1311: ip_nfrags -= nfrags;
1.25 cgd 1312: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1313: FREE(fp, M_FTABLE);
1.131 itojun 1314: ip_nfragpackets--;
1.1 cgd 1315: }
1316:
1317: /*
1.194 jonathan 1318: * IP reassembly TTL machinery for multiplicative drop.
1319: */
1320: static u_int fragttl_histo[(IPFRAGTTL+1)];
1321:
1322:
1323: /*
1324: * Decrement TTL of all reasembly queue entries by `ticks'.
1325: * Count number of distinct fragments (as opposed to partial, fragmented
1326: * datagrams) in the reassembly queue. While we traverse the entire
1327: * reassembly queue, compute and return the median TTL over all fragments.
1328: */
1329: static u_int
1330: ip_reass_ttl_decr(u_int ticks)
1331: {
1.198 matt 1332: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1333: struct ipq *fp, *nfp;
1.198 matt 1334: int i;
1.212 perry 1335:
1.194 jonathan 1336: nfrags = 0;
1337: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1338:
1.194 jonathan 1339: for (i = 0; i < IPREASS_NHASH; i++) {
1340: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1341: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1342: 0 : fp->ipq_ttl - ticks);
1343: nfp = LIST_NEXT(fp, ipq_q);
1344: if (fp->ipq_ttl == 0) {
1.266 thorpej 1345: IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194 jonathan 1346: ip_freef(fp);
1347: } else {
1348: nfrags += fp->ipq_nfrags;
1349: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1350: }
1351: }
1352: }
1353:
1354: KASSERT(ip_nfrags == nfrags);
1355:
1356: /* Find median (or other drop fraction) in histogram. */
1357: dropfraction = (ip_nfrags / 2);
1358: keepfraction = ip_nfrags - dropfraction;
1359: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1360: median += fragttl_histo[i];
1361: if (median >= keepfraction)
1362: break;
1363: }
1364:
1365: /* Return TTL of median (or other fraction). */
1366: return (u_int)i;
1367: }
1368:
1369: void
1370: ip_reass_drophalf(void)
1371: {
1372:
1373: u_int median_ticks;
1374: /*
1375: * Compute median TTL of all fragments, and count frags
1376: * with that TTL or lower (roughly half of all fragments).
1377: */
1378: median_ticks = ip_reass_ttl_decr(0);
1379:
1380: /* Drop half. */
1381: median_ticks = ip_reass_ttl_decr(median_ticks);
1382:
1383: }
1384:
1385: /*
1.1 cgd 1386: * IP timer processing;
1387: * if a timer expires on a reassembly
1388: * queue, discard it.
1389: */
1.8 mycroft 1390: void
1.211 perry 1391: ip_slowtimo(void)
1.1 cgd 1392: {
1.191 jonathan 1393: static u_int dropscanidx = 0;
1394: u_int i;
1.194 jonathan 1395: u_int median_ttl;
1.268 ! ad 1396:
! 1397: mutex_enter(softnet_lock);
! 1398: KERNEL_LOCK(1, NULL);
1.1 cgd 1399:
1.75 thorpej 1400: IPQ_LOCK();
1.194 jonathan 1401:
1402: /* Age TTL of all fragments by 1 tick .*/
1403: median_ttl = ip_reass_ttl_decr(1);
1404:
1405: /* make sure fragment limit is up-to-date */
1406: CHECK_NMBCLUSTER_PARAMS();
1407:
1408: /* If we have too many fragments, drop the older half. */
1409: if (ip_nfrags > ip_maxfrags)
1410: ip_reass_ttl_decr(median_ttl);
1411:
1.131 itojun 1412: /*
1.194 jonathan 1413: * If we are over the maximum number of fragmented packets
1.131 itojun 1414: * (due to the limit being lowered), drain off
1.190 jonathan 1415: * enough to get down to the new limit. Start draining
1416: * from the reassembly hashqueue most recently drained.
1.131 itojun 1417: */
1418: if (ip_maxfragpackets < 0)
1419: ;
1420: else {
1.190 jonathan 1421: int wrapped = 0;
1422:
1423: i = dropscanidx;
1424: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1425: while (LIST_FIRST(&ipq[i]) != NULL)
1426: ip_freef(LIST_FIRST(&ipq[i]));
1427: if (++i >= IPREASS_NHASH) {
1428: i = 0;
1429: }
1430: /*
1431: * Dont scan forever even if fragment counters are
1432: * wrong: stop after scanning entire reassembly queue.
1433: */
1434: if (i == dropscanidx)
1435: wrapped = 1;
1436: }
1437: dropscanidx = i;
1.131 itojun 1438: }
1.75 thorpej 1439: IPQ_UNLOCK();
1.268 ! ad 1440:
! 1441: KERNEL_UNLOCK_ONE(NULL);
! 1442: mutex_exit(softnet_lock);
1.1 cgd 1443: }
1444:
1445: /*
1446: * Drain off all datagram fragments.
1447: */
1.8 mycroft 1448: void
1.211 perry 1449: ip_drain(void)
1.1 cgd 1450: {
1451:
1.268 ! ad 1452: mutex_enter(softnet_lock);
! 1453: KERNEL_LOCK(1, NULL);
! 1454:
1.75 thorpej 1455: /*
1456: * We may be called from a device's interrupt context. If
1457: * the ipq is already busy, just bail out now.
1458: */
1.268 ! ad 1459: if (ipq_lock_try() != 0) {
! 1460: /*
! 1461: * Drop half the total fragments now. If more mbufs are
! 1462: * needed, we will be called again soon.
! 1463: */
! 1464: ip_reass_drophalf();
! 1465: IPQ_UNLOCK();
! 1466: }
1.75 thorpej 1467:
1.268 ! ad 1468: KERNEL_UNLOCK_ONE(NULL);
! 1469: mutex_exit(softnet_lock);
1.1 cgd 1470: }
1471:
1472: /*
1473: * Do option processing on a datagram,
1474: * possibly discarding it if bad options are encountered,
1475: * or forwarding it if source-routed.
1476: * Returns 1 if packet has been forwarded/freed,
1477: * 0 if the packet should be processed further.
1478: */
1.8 mycroft 1479: int
1.211 perry 1480: ip_dooptions(struct mbuf *m)
1.1 cgd 1481: {
1.109 augustss 1482: struct ip *ip = mtod(m, struct ip *);
1483: u_char *cp, *cp0;
1484: struct ip_timestamp *ipt;
1485: struct in_ifaddr *ia;
1.1 cgd 1486: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1487: struct in_addr dst;
1.1 cgd 1488: n_time ntime;
1489:
1.13 mycroft 1490: dst = ip->ip_dst;
1.1 cgd 1491: cp = (u_char *)(ip + 1);
1492: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1493: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1494: opt = cp[IPOPT_OPTVAL];
1495: if (opt == IPOPT_EOL)
1496: break;
1497: if (opt == IPOPT_NOP)
1498: optlen = 1;
1499: else {
1.113 itojun 1500: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1501: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1502: goto bad;
1503: }
1.1 cgd 1504: optlen = cp[IPOPT_OLEN];
1.114 itojun 1505: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1506: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1507: goto bad;
1508: }
1509: }
1510: switch (opt) {
1511:
1512: default:
1513: break;
1514:
1515: /*
1516: * Source routing with record.
1517: * Find interface with current destination address.
1518: * If none on this machine then drop if strictly routed,
1519: * or do nothing if loosely routed.
1520: * Record interface address and bring up next address
1521: * component. If strictly routed make sure next
1522: * address is on directly accessible net.
1523: */
1524: case IPOPT_LSRR:
1525: case IPOPT_SSRR:
1.47 cjs 1526: if (ip_allowsrcrt == 0) {
1527: type = ICMP_UNREACH;
1528: code = ICMP_UNREACH_NET_PROHIB;
1529: goto bad;
1530: }
1.114 itojun 1531: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1532: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1533: goto bad;
1534: }
1.1 cgd 1535: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1536: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1537: goto bad;
1538: }
1539: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1540: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1541: if (ia == 0) {
1542: if (opt == IPOPT_SSRR) {
1543: type = ICMP_UNREACH;
1544: code = ICMP_UNREACH_SRCFAIL;
1545: goto bad;
1546: }
1547: /*
1548: * Loose routing, and not at next destination
1549: * yet; nothing to do except forward.
1550: */
1551: break;
1552: }
1553: off--; /* 0 origin */
1.112 sommerfe 1554: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1555: /*
1556: * End of source route. Should be for us.
1557: */
1558: save_rte(cp, ip->ip_src);
1559: break;
1560: }
1561: /*
1562: * locate outgoing interface
1563: */
1.244 christos 1564: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1 cgd 1565: sizeof(ipaddr.sin_addr));
1.96 thorpej 1566: if (opt == IPOPT_SSRR)
1.196 itojun 1567: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1568: else
1.1 cgd 1569: ia = ip_rtaddr(ipaddr.sin_addr);
1570: if (ia == 0) {
1571: type = ICMP_UNREACH;
1572: code = ICMP_UNREACH_SRCFAIL;
1573: goto bad;
1574: }
1575: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1576: bcopy((void *)&ia->ia_addr.sin_addr,
1577: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1578: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1579: /*
1580: * Let ip_intr's mcast routing check handle mcast pkts
1581: */
1.18 mycroft 1582: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1583: break;
1584:
1585: case IPOPT_RR:
1.114 itojun 1586: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1587: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1588: goto bad;
1589: }
1.1 cgd 1590: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1591: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1592: goto bad;
1593: }
1594: /*
1595: * If no space remains, ignore.
1596: */
1597: off--; /* 0 origin */
1.112 sommerfe 1598: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1599: break;
1.244 christos 1600: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1 cgd 1601: sizeof(ipaddr.sin_addr));
1602: /*
1603: * locate outgoing interface; if we're the destination,
1604: * use the incoming interface (should be same).
1605: */
1.96 thorpej 1606: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1607: == NULL &&
1608: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1609: type = ICMP_UNREACH;
1610: code = ICMP_UNREACH_HOST;
1611: goto bad;
1612: }
1.244 christos 1613: bcopy((void *)&ia->ia_addr.sin_addr,
1614: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1615: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1616: break;
1617:
1618: case IPOPT_TS:
1619: code = cp - (u_char *)ip;
1620: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1621: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1622: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1623: goto bad;
1.114 itojun 1624: }
1625: if (ipt->ipt_ptr < 5) {
1626: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1627: goto bad;
1628: }
1.15 cgd 1629: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1630: if (++ipt->ipt_oflw == 0) {
1631: code = (u_char *)&ipt->ipt_ptr -
1632: (u_char *)ip;
1.1 cgd 1633: goto bad;
1.114 itojun 1634: }
1.1 cgd 1635: break;
1636: }
1.104 thorpej 1637: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1638: switch (ipt->ipt_flg) {
1639:
1640: case IPOPT_TS_TSONLY:
1641: break;
1642:
1643: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1644: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1645: sizeof(struct in_addr) > ipt->ipt_len) {
1646: code = (u_char *)&ipt->ipt_ptr -
1647: (u_char *)ip;
1.1 cgd 1648: goto bad;
1.114 itojun 1649: }
1.13 mycroft 1650: ipaddr.sin_addr = dst;
1.96 thorpej 1651: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1652: m->m_pkthdr.rcvif));
1.13 mycroft 1653: if (ia == 0)
1654: continue;
1.104 thorpej 1655: bcopy(&ia->ia_addr.sin_addr,
1656: cp0, sizeof(struct in_addr));
1.1 cgd 1657: ipt->ipt_ptr += sizeof(struct in_addr);
1658: break;
1659:
1660: case IPOPT_TS_PRESPEC:
1.66 thorpej 1661: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1662: sizeof(struct in_addr) > ipt->ipt_len) {
1663: code = (u_char *)&ipt->ipt_ptr -
1664: (u_char *)ip;
1.1 cgd 1665: goto bad;
1.114 itojun 1666: }
1.104 thorpej 1667: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1668: sizeof(struct in_addr));
1.96 thorpej 1669: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1670: == NULL)
1.1 cgd 1671: continue;
1672: ipt->ipt_ptr += sizeof(struct in_addr);
1673: break;
1674:
1675: default:
1.114 itojun 1676: /* XXX can't take &ipt->ipt_flg */
1677: code = (u_char *)&ipt->ipt_ptr -
1678: (u_char *)ip + 1;
1.1 cgd 1679: goto bad;
1680: }
1681: ntime = iptime();
1.107 thorpej 1682: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1683: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1684: sizeof(n_time));
1685: ipt->ipt_ptr += sizeof(n_time);
1686: }
1687: }
1688: if (forward) {
1.26 thorpej 1689: if (ip_forwsrcrt == 0) {
1690: type = ICMP_UNREACH;
1691: code = ICMP_UNREACH_SRCFAIL;
1692: goto bad;
1693: }
1.1 cgd 1694: ip_forward(m, 1);
1695: return (1);
1.13 mycroft 1696: }
1697: return (0);
1.1 cgd 1698: bad:
1.13 mycroft 1699: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1700: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1701: return (1);
1702: }
1703:
1704: /*
1705: * Given address of next destination (final or next hop),
1706: * return internet address info of interface to be used to get there.
1707: */
1708: struct in_ifaddr *
1.211 perry 1709: ip_rtaddr(struct in_addr dst)
1.1 cgd 1710: {
1.249 dyoung 1711: struct rtentry *rt;
1712: union {
1713: struct sockaddr dst;
1714: struct sockaddr_in dst4;
1715: } u;
1716:
1717: sockaddr_in_init(&u.dst4, &dst, 0);
1718:
1719: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1720: return NULL;
1721:
1722: return ifatoia(rt->rt_ifa);
1.1 cgd 1723: }
1724:
1725: /*
1726: * Save incoming source route for use in replies,
1727: * to be picked up later by ip_srcroute if the receiver is interested.
1728: */
1.13 mycroft 1729: void
1.211 perry 1730: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1731: {
1732: unsigned olen;
1733:
1734: olen = option[IPOPT_OLEN];
1735: #ifdef DIAGNOSTIC
1736: if (ipprintfs)
1.39 christos 1737: printf("save_rte: olen %d\n", olen);
1.89 itojun 1738: #endif /* 0 */
1.1 cgd 1739: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1740: return;
1.244 christos 1741: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1 cgd 1742: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1743: ip_srcrt.dst = dst;
1744: }
1745:
1746: /*
1747: * Retrieve incoming source route for use in replies,
1748: * in the same form used by setsockopt.
1749: * The first hop is placed before the options, will be removed later.
1750: */
1751: struct mbuf *
1.211 perry 1752: ip_srcroute(void)
1.1 cgd 1753: {
1.109 augustss 1754: struct in_addr *p, *q;
1755: struct mbuf *m;
1.1 cgd 1756:
1757: if (ip_nhops == 0)
1.237 dyoung 1758: return NULL;
1.1 cgd 1759: m = m_get(M_DONTWAIT, MT_SOOPTS);
1760: if (m == 0)
1.237 dyoung 1761: return NULL;
1.1 cgd 1762:
1.164 matt 1763: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1764: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1765:
1766: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1767: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1768: OPTSIZ;
1769: #ifdef DIAGNOSTIC
1770: if (ipprintfs)
1.39 christos 1771: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1772: #endif
1773:
1774: /*
1775: * First save first hop for return route
1776: */
1777: p = &ip_srcrt.route[ip_nhops - 1];
1778: *(mtod(m, struct in_addr *)) = *p--;
1779: #ifdef DIAGNOSTIC
1780: if (ipprintfs)
1.39 christos 1781: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1782: #endif
1783:
1784: /*
1785: * Copy option fields and padding (nop) to mbuf.
1786: */
1787: ip_srcrt.nop = IPOPT_NOP;
1788: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1789: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1790: OPTSIZ);
1791: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1792: sizeof(struct in_addr) + OPTSIZ);
1793: #undef OPTSIZ
1794: /*
1795: * Record return path as an IP source route,
1796: * reversing the path (pointers are now aligned).
1797: */
1798: while (p >= ip_srcrt.route) {
1799: #ifdef DIAGNOSTIC
1800: if (ipprintfs)
1.39 christos 1801: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1802: #endif
1803: *q++ = *p--;
1804: }
1805: /*
1806: * Last hop goes to final destination.
1807: */
1808: *q = ip_srcrt.dst;
1809: #ifdef DIAGNOSTIC
1810: if (ipprintfs)
1.39 christos 1811: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1812: #endif
1813: return (m);
1814: }
1815:
1.139 matt 1816: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1817: [PRC_MSGSIZE] = EMSGSIZE,
1818: [PRC_HOSTDEAD] = EHOSTDOWN,
1819: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1820: [PRC_UNREACH_NET] = EHOSTUNREACH,
1821: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1822: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1823: [PRC_UNREACH_PORT] = ECONNREFUSED,
1824: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1825: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1826: };
1827:
1828: /*
1829: * Forward a packet. If some error occurs return the sender
1830: * an icmp packet. Note we can't always generate a meaningful
1831: * icmp message because icmp doesn't have a large enough repertoire
1832: * of codes and types.
1833: *
1834: * If not forwarding, just drop the packet. This could be confusing
1835: * if ipforwarding was zero but some routing protocol was advancing
1836: * us as a gateway to somewhere. However, we must let the routing
1837: * protocol deal with that.
1838: *
1839: * The srcrt parameter indicates whether the packet is being forwarded
1840: * via a source route.
1841: */
1.13 mycroft 1842: void
1.211 perry 1843: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1844: {
1.109 augustss 1845: struct ip *ip = mtod(m, struct ip *);
1846: struct rtentry *rt;
1.220 christos 1847: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1848: struct mbuf *mcopy;
1.13 mycroft 1849: n_long dest;
1.249 dyoung 1850: union {
1851: struct sockaddr dst;
1852: struct sockaddr_in dst4;
1853: } u;
1.164 matt 1854:
1855: /*
1856: * We are now in the output path.
1857: */
1858: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1859:
1860: /*
1861: * Clear any in-bound checksum flags for this packet.
1862: */
1863: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1864:
1.13 mycroft 1865: dest = 0;
1.1 cgd 1866: #ifdef DIAGNOSTIC
1.224 joerg 1867: if (ipprintfs) {
1868: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1869: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1870: }
1.1 cgd 1871: #endif
1.93 sommerfe 1872: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1873: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1874: m_freem(m);
1875: return;
1876: }
1877: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1878: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1879: return;
1880: }
1881:
1.249 dyoung 1882: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1883: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1884: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1885: return;
1.1 cgd 1886: }
1887:
1888: /*
1.34 mycroft 1889: * Save at most 68 bytes of the packet in case
1.1 cgd 1890: * we need to generate an ICMP message to the src.
1.119 itojun 1891: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1892: */
1.155 itojun 1893: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1894: if (mcopy)
1895: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1896:
1.221 christos 1897: ip->ip_ttl -= IPTTLDEC;
1898:
1.1 cgd 1899: /*
1900: * If forwarding packet using same interface that it came in on,
1901: * perhaps should send a redirect to sender to shortcut a hop.
1902: * Only send redirect if source is sending directly to us,
1903: * and if packet was not source routed (or has any options).
1904: * Also, don't send redirect if forwarding using a default route
1905: * or a route modified by a redirect.
1906: */
1907: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1908: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1909: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1910: ipsendredirects && !srcrt) {
1.19 mycroft 1911: if (rt->rt_ifa &&
1912: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1913: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1914: if (rt->rt_flags & RTF_GATEWAY)
1915: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1916: else
1917: dest = ip->ip_dst.s_addr;
1918: /*
1919: * Router requirements says to only send host
1920: * redirects.
1921: */
1922: type = ICMP_REDIRECT;
1923: code = ICMP_REDIRECT_HOST;
1.1 cgd 1924: #ifdef DIAGNOSTIC
1.77 thorpej 1925: if (ipprintfs)
1926: printf("redirect (%d) to %x\n", code,
1927: (u_int32_t)dest);
1.1 cgd 1928: #endif
1929: }
1930: }
1931:
1.238 dyoung 1932: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1933: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1934: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1935:
1.1 cgd 1936: if (error)
1.266 thorpej 1937: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1938: else {
1.266 thorpej 1939: uint64_t *ips = IP_STAT_GETREF();
1940: ips[IP_STAT_FORWARD]++;
1941: if (type) {
1942: ips[IP_STAT_REDIRECTSENT]++;
1943: IP_STAT_PUTREF();
1944: } else {
1945: IP_STAT_PUTREF();
1.63 matt 1946: if (mcopy) {
1947: #ifdef GATEWAY
1.64 thorpej 1948: if (mcopy->m_flags & M_CANFASTFWD)
1949: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1950: #endif
1.1 cgd 1951: m_freem(mcopy);
1.63 matt 1952: }
1.1 cgd 1953: return;
1954: }
1955: }
1956: if (mcopy == NULL)
1957: return;
1.13 mycroft 1958:
1.1 cgd 1959: switch (error) {
1960:
1961: case 0: /* forwarded, but need redirect */
1962: /* type, code set above */
1963: break;
1964:
1965: case ENETUNREACH: /* shouldn't happen, checked above */
1966: case EHOSTUNREACH:
1967: case ENETDOWN:
1968: case EHOSTDOWN:
1969: default:
1970: type = ICMP_UNREACH;
1971: code = ICMP_UNREACH_HOST;
1972: break;
1973:
1974: case EMSGSIZE:
1975: type = ICMP_UNREACH;
1976: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1977:
1.261 dyoung 1978: if ((rt = rtcache_validate(&ipforward_rt)) != NULL) {
1.263 cube 1979:
1980: #if defined(IPSEC) || defined(FAST_IPSEC)
1981: /*
1982: * If the packet is routed over IPsec tunnel, tell the
1983: * originator the tunnel MTU.
1984: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1985: * XXX quickhack!!!
1986: */
1987:
1.89 itojun 1988: struct secpolicy *sp;
1989: int ipsecerror;
1.95 itojun 1990: size_t ipsechdr;
1.89 itojun 1991: struct route *ro;
1992:
1993: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1994: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1995: &ipsecerror);
1.263 cube 1996: #endif
1.89 itojun 1997:
1.263 cube 1998: destmtu = rt->rt_ifp->if_mtu;
1999: #if defined(IPSEC) || defined(FAST_IPSEC)
2000: if (sp != NULL) {
1.89 itojun 2001: /* count IPsec header size */
1.95 itojun 2002: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 2003: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 2004:
2005: /*
2006: * find the correct route for outer IPv4
2007: * header, compute tunnel MTU.
2008: */
1.220 christos 2009:
1.89 itojun 2010: if (sp->req != NULL
1.95 itojun 2011: && sp->req->sav != NULL
2012: && sp->req->sav->sah != NULL) {
2013: ro = &sp->req->sav->sah->sa_route;
1.257 dyoung 2014: if (rt && rt->rt_ifp) {
1.220 christos 2015: destmtu =
1.257 dyoung 2016: rt->rt_rmx.rmx_mtu ?
2017: rt->rt_rmx.rmx_mtu :
2018: rt->rt_ifp->if_mtu;
1.220 christos 2019: destmtu -= ipsechdr;
1.89 itojun 2020: }
2021: }
2022:
1.173 jonathan 2023: #ifdef IPSEC
1.89 itojun 2024: key_freesp(sp);
1.173 jonathan 2025: #else
2026: KEY_FREESP(&sp);
2027: #endif
1.89 itojun 2028: }
1.263 cube 2029: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.89 itojun 2030: }
1.266 thorpej 2031: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 2032: break;
2033:
2034: case ENOBUFS:
1.143 itojun 2035: #if 1
2036: /*
2037: * a router should not generate ICMP_SOURCEQUENCH as
2038: * required in RFC1812 Requirements for IP Version 4 Routers.
2039: * source quench could be a big problem under DoS attacks,
1.149 wiz 2040: * or if the underlying interface is rate-limited.
1.143 itojun 2041: */
2042: if (mcopy)
2043: m_freem(mcopy);
2044: return;
2045: #else
1.1 cgd 2046: type = ICMP_SOURCEQUENCH;
2047: code = 0;
2048: break;
1.143 itojun 2049: #endif
1.1 cgd 2050: }
1.220 christos 2051: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2052: }
2053:
2054: void
1.211 perry 2055: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2056: struct mbuf *m)
1.44 thorpej 2057: {
2058:
2059: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2060: struct timeval tv;
2061:
2062: microtime(&tv);
1.244 christos 2063: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2064: SCM_TIMESTAMP, SOL_SOCKET);
2065: if (*mp)
2066: mp = &(*mp)->m_next;
2067: }
2068: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2069: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2070: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2071: if (*mp)
2072: mp = &(*mp)->m_next;
2073: }
2074: #ifdef notyet
2075: /*
2076: * XXX
2077: * Moving these out of udp_input() made them even more broken
2078: * than they already were.
2079: * - fenner@parc.xerox.com
2080: */
2081: /* options were tossed already */
2082: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2083: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2084: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2085: if (*mp)
2086: mp = &(*mp)->m_next;
2087: }
2088: /* ip_srcroute doesn't do what we want here, need to fix */
2089: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2090: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2091: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2092: if (*mp)
2093: mp = &(*mp)->m_next;
2094: }
2095: #endif
2096: if (inp->inp_flags & INP_RECVIF) {
2097: struct sockaddr_dl sdl;
2098:
1.252 dyoung 2099: sockaddr_dl_init(&sdl, sizeof(sdl),
2100: (m->m_pkthdr.rcvif != NULL)
2101: ? m->m_pkthdr.rcvif->if_index
2102: : 0,
2103: 0, NULL, 0, NULL, 0);
1.251 dyoung 2104: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2105: if (*mp)
2106: mp = &(*mp)->m_next;
2107: }
1.13 mycroft 2108: }
2109:
1.189 atatat 2110: /*
1.228 elad 2111: * sysctl helper routine for net.inet.ip.forwsrcrt.
2112: */
2113: static int
2114: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2115: {
2116: int error, tmp;
2117: struct sysctlnode node;
2118:
2119: node = *rnode;
2120: tmp = ip_forwsrcrt;
2121: node.sysctl_data = &tmp;
2122: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2123: if (error || newp == NULL)
2124: return (error);
2125:
1.230 elad 2126: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232 elad 2127: 0, NULL, NULL, NULL))
1.228 elad 2128: return (EPERM);
2129:
2130: ip_forwsrcrt = tmp;
2131:
2132: return (0);
2133: }
2134:
2135: /*
1.189 atatat 2136: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2137: * range of the new value and tweaks timers if it changes.
2138: */
2139: static int
2140: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2141: {
1.189 atatat 2142: int error, tmp;
2143: struct sysctlnode node;
2144:
2145: node = *rnode;
2146: tmp = ip_mtudisc_timeout;
2147: node.sysctl_data = &tmp;
2148: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2149: if (error || newp == NULL)
2150: return (error);
2151: if (tmp < 0)
2152: return (EINVAL);
1.52 thorpej 2153:
1.189 atatat 2154: ip_mtudisc_timeout = tmp;
2155: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2156:
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: {
2167: int s;
1.67 thorpej 2168:
1.217 atatat 2169: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247 liamjfoy 2170: if (s || newp == NULL)
1.189 atatat 2171: return (s);
1.212 perry 2172:
1.189 atatat 2173: s = splsoftnet();
1.265 thorpej 2174: ipflow_prune();
1.189 atatat 2175: splx(s);
1.144 martin 2176:
1.189 atatat 2177: return (0);
2178: }
1.248 liamjfoy 2179:
2180: static int
2181: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
2182: {
2183: int error, tmp;
2184: struct sysctlnode node;
2185:
2186: node = *rnode;
2187: tmp = ip_hashsize;
2188: node.sysctl_data = &tmp;
2189: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2190: if (error || newp == NULL)
2191: return (error);
2192:
2193: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2194: /*
2195: * Can only fail due to malloc()
2196: */
2197: if (ipflow_invalidate_all(tmp))
2198: return ENOMEM;
2199: } else {
2200: /*
2201: * EINVAL if not a power of 2
2202: */
2203: return EINVAL;
2204: }
2205:
2206: return (0);
2207: }
1.189 atatat 2208: #endif /* GATEWAY */
1.117 tron 2209:
1.266 thorpej 2210: static int
2211: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
2212: {
1.267 thorpej 2213: netstat_sysctl_context ctx;
1.266 thorpej 2214: uint64_t ips[IP_NSTATS];
2215:
1.267 thorpej 2216: ctx.ctx_stat = ipstat_percpu;
2217: ctx.ctx_counters = ips;
2218: ctx.ctx_ncounters = IP_NSTATS;
2219: return (NETSTAT_SYSCTL(&ctx));
1.266 thorpej 2220: }
1.131 itojun 2221:
1.189 atatat 2222: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2223: {
2224: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2225:
1.197 atatat 2226: sysctl_createv(clog, 0, NULL, NULL,
2227: CTLFLAG_PERMANENT,
1.189 atatat 2228: CTLTYPE_NODE, "net", NULL,
2229: NULL, 0, NULL, 0,
2230: CTL_NET, CTL_EOL);
1.197 atatat 2231: sysctl_createv(clog, 0, NULL, NULL,
2232: CTLFLAG_PERMANENT,
1.203 atatat 2233: CTLTYPE_NODE, "inet",
2234: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2235: NULL, 0, NULL, 0,
2236: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2237: sysctl_createv(clog, 0, NULL, NULL,
2238: CTLFLAG_PERMANENT,
1.203 atatat 2239: CTLTYPE_NODE, "ip",
2240: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2241: NULL, 0, NULL, 0,
2242: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2243:
1.197 atatat 2244: sysctl_createv(clog, 0, NULL, NULL,
2245: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2246: CTLTYPE_INT, "forwarding",
2247: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2248: NULL, 0, &ipforwarding, 0,
2249: CTL_NET, PF_INET, IPPROTO_IP,
2250: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2251: sysctl_createv(clog, 0, NULL, NULL,
2252: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2253: CTLTYPE_INT, "redirect",
2254: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2255: NULL, 0, &ipsendredirects, 0,
2256: CTL_NET, PF_INET, IPPROTO_IP,
2257: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2258: sysctl_createv(clog, 0, NULL, NULL,
2259: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2260: CTLTYPE_INT, "ttl",
2261: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2262: NULL, 0, &ip_defttl, 0,
2263: CTL_NET, PF_INET, IPPROTO_IP,
2264: IPCTL_DEFTTL, CTL_EOL);
2265: #ifdef IPCTL_DEFMTU
1.197 atatat 2266: sysctl_createv(clog, 0, NULL, NULL,
2267: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2268: CTLTYPE_INT, "mtu",
2269: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2270: NULL, 0, &ip_mtu, 0,
2271: CTL_NET, PF_INET, IPPROTO_IP,
2272: IPCTL_DEFMTU, CTL_EOL);
2273: #endif /* IPCTL_DEFMTU */
1.197 atatat 2274: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2275: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2276: CTLTYPE_INT, "forwsrcrt",
2277: SYSCTL_DESCR("Enable forwarding of source-routed "
2278: "datagrams"),
1.228 elad 2279: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2280: CTL_NET, PF_INET, IPPROTO_IP,
2281: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2282: sysctl_createv(clog, 0, NULL, NULL,
2283: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2284: CTLTYPE_INT, "directed-broadcast",
2285: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2286: NULL, 0, &ip_directedbcast, 0,
2287: CTL_NET, PF_INET, IPPROTO_IP,
2288: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2289: sysctl_createv(clog, 0, NULL, NULL,
2290: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2291: CTLTYPE_INT, "allowsrcrt",
2292: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2293: NULL, 0, &ip_allowsrcrt, 0,
2294: CTL_NET, PF_INET, IPPROTO_IP,
2295: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2296: sysctl_createv(clog, 0, NULL, NULL,
2297: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2298: CTLTYPE_INT, "subnetsarelocal",
2299: SYSCTL_DESCR("Whether logical subnets are considered "
2300: "local"),
1.189 atatat 2301: NULL, 0, &subnetsarelocal, 0,
2302: CTL_NET, PF_INET, IPPROTO_IP,
2303: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2304: sysctl_createv(clog, 0, NULL, NULL,
2305: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2306: CTLTYPE_INT, "mtudisc",
2307: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2308: NULL, 0, &ip_mtudisc, 0,
2309: CTL_NET, PF_INET, IPPROTO_IP,
2310: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2311: sysctl_createv(clog, 0, NULL, NULL,
2312: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2313: CTLTYPE_INT, "anonportmin",
2314: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2315: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2316: CTL_NET, PF_INET, IPPROTO_IP,
2317: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2318: sysctl_createv(clog, 0, NULL, NULL,
2319: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2320: CTLTYPE_INT, "anonportmax",
2321: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2322: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2323: CTL_NET, PF_INET, IPPROTO_IP,
2324: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2325: sysctl_createv(clog, 0, NULL, NULL,
2326: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2327: CTLTYPE_INT, "mtudisctimeout",
2328: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2329: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2330: CTL_NET, PF_INET, IPPROTO_IP,
2331: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2332: #ifdef GATEWAY
1.197 atatat 2333: sysctl_createv(clog, 0, NULL, NULL,
2334: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2335: CTLTYPE_INT, "maxflows",
2336: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2337: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2338: CTL_NET, PF_INET, IPPROTO_IP,
2339: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2340: sysctl_createv(clog, 0, NULL, NULL,
2341: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2342: CTLTYPE_INT, "hashsize",
2343: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2344: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2345: CTL_NET, PF_INET, IPPROTO_IP,
2346: CTL_CREATE, CTL_EOL);
1.189 atatat 2347: #endif /* GATEWAY */
1.197 atatat 2348: sysctl_createv(clog, 0, NULL, NULL,
2349: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2350: CTLTYPE_INT, "hostzerobroadcast",
2351: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2352: NULL, 0, &hostzeroisbroadcast, 0,
2353: CTL_NET, PF_INET, IPPROTO_IP,
2354: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2355: #if NGIF > 0
1.197 atatat 2356: sysctl_createv(clog, 0, NULL, NULL,
2357: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2358: CTLTYPE_INT, "gifttl",
2359: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2360: NULL, 0, &ip_gif_ttl, 0,
2361: CTL_NET, PF_INET, IPPROTO_IP,
2362: IPCTL_GIF_TTL, CTL_EOL);
2363: #endif /* NGIF */
2364: #ifndef IPNOPRIVPORTS
1.197 atatat 2365: sysctl_createv(clog, 0, NULL, NULL,
2366: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2367: CTLTYPE_INT, "lowportmin",
2368: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2369: "to assign"),
1.189 atatat 2370: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2371: CTL_NET, PF_INET, IPPROTO_IP,
2372: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2373: sysctl_createv(clog, 0, NULL, NULL,
2374: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2375: CTLTYPE_INT, "lowportmax",
2376: SYSCTL_DESCR("Highest privileged ephemeral port number "
2377: "to assign"),
1.189 atatat 2378: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2379: CTL_NET, PF_INET, IPPROTO_IP,
2380: IPCTL_LOWPORTMAX, CTL_EOL);
2381: #endif /* IPNOPRIVPORTS */
1.197 atatat 2382: sysctl_createv(clog, 0, NULL, NULL,
2383: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2384: CTLTYPE_INT, "maxfragpackets",
2385: SYSCTL_DESCR("Maximum number of fragments to retain for "
2386: "possible reassembly"),
1.189 atatat 2387: NULL, 0, &ip_maxfragpackets, 0,
2388: CTL_NET, PF_INET, IPPROTO_IP,
2389: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2390: #if NGRE > 0
1.197 atatat 2391: sysctl_createv(clog, 0, NULL, NULL,
2392: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2393: CTLTYPE_INT, "grettl",
2394: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2395: NULL, 0, &ip_gre_ttl, 0,
2396: CTL_NET, PF_INET, IPPROTO_IP,
2397: IPCTL_GRE_TTL, CTL_EOL);
2398: #endif /* NGRE */
1.197 atatat 2399: sysctl_createv(clog, 0, NULL, NULL,
2400: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2401: CTLTYPE_INT, "checkinterface",
2402: SYSCTL_DESCR("Enable receive side of Strong ES model "
2403: "from RFC1122"),
1.189 atatat 2404: NULL, 0, &ip_checkinterface, 0,
2405: CTL_NET, PF_INET, IPPROTO_IP,
2406: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2407: sysctl_createv(clog, 0, NULL, NULL,
2408: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2409: CTLTYPE_INT, "random_id",
2410: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2411: NULL, 0, &ip_do_randomid, 0,
2412: CTL_NET, PF_INET, IPPROTO_IP,
2413: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2414: sysctl_createv(clog, 0, NULL, NULL,
2415: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2416: CTLTYPE_INT, "do_loopback_cksum",
2417: SYSCTL_DESCR("Perform IP checksum on loopback"),
2418: NULL, 0, &ip_do_loopback_cksum, 0,
2419: CTL_NET, PF_INET, IPPROTO_IP,
2420: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2421: sysctl_createv(clog, 0, NULL, NULL,
2422: CTLFLAG_PERMANENT,
2423: CTLTYPE_STRUCT, "stats",
2424: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 2425: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 2426: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2427: CTL_EOL);
1.1 cgd 2428: }
1.266 thorpej 2429:
2430: void
2431: ip_statinc(u_int stat)
2432: {
2433:
2434: KASSERT(stat < IP_NSTATS);
2435: IP_STATINC(stat);
2436: }
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