Annotation of src/sys/netinet/ip_input.c, Revision 1.267
1.267 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 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>
1.267 ! thorpej 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.266 2008/04/12 05:58:22 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:
1.241 ad 472: while (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 473: s = splnet();
1.89 itojun 474: IF_DEQUEUE(&ipintrq, m);
475: splx(s);
476: if (m == 0)
477: return;
478: ip_input(m);
479: }
480: }
481:
482: /*
1.1 cgd 483: * Ip input routine. Checksum and byte swap header. If fragmented
484: * try to reassemble. Process options. Pass to next level.
485: */
1.8 mycroft 486: void
1.89 itojun 487: ip_input(struct mbuf *m)
1.1 cgd 488: {
1.109 augustss 489: struct ip *ip = NULL;
490: struct ipq *fp;
491: struct in_ifaddr *ia;
492: struct ifaddr *ifa;
1.25 cgd 493: struct ipqent *ipqe;
1.89 itojun 494: int hlen = 0, mff, len;
1.100 itojun 495: int downmatch;
1.165 christos 496: int checkif;
1.169 itojun 497: int srcrt = 0;
1.233 tls 498: int s;
1.190 jonathan 499: u_int hash;
1.173 jonathan 500: #ifdef FAST_IPSEC
501: struct m_tag *mtag;
502: struct tdb_ident *tdbi;
503: struct secpolicy *sp;
1.233 tls 504: int error;
1.173 jonathan 505: #endif /* FAST_IPSEC */
1.1 cgd 506:
1.164 matt 507: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 508: #ifdef DIAGNOSTIC
509: if ((m->m_flags & M_PKTHDR) == 0)
510: panic("ipintr no HDR");
1.89 itojun 511: #endif
1.164 matt 512:
1.1 cgd 513: /*
514: * If no IP addresses have been set yet but the interfaces
515: * are receiving, can't do anything with incoming packets yet.
516: */
1.181 jonathan 517: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 518: goto bad;
1.266 thorpej 519: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 520: /*
521: * If the IP header is not aligned, slurp it up into a new
522: * mbuf with space for link headers, in the event we forward
523: * it. Otherwise, if it is aligned, make sure the entire
524: * base IP header is in the first mbuf of the chain.
525: */
1.244 christos 526: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 527: if ((m = m_copyup(m, sizeof(struct ip),
528: (max_linkhdr + 3) & ~3)) == NULL) {
529: /* XXXJRT new stat, please */
1.266 thorpej 530: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 531: return;
532: }
533: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
534: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 535: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 536: return;
537: }
1.1 cgd 538: }
539: ip = mtod(m, struct ip *);
1.13 mycroft 540: if (ip->ip_v != IPVERSION) {
1.266 thorpej 541: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 542: goto bad;
543: }
1.1 cgd 544: hlen = ip->ip_hl << 2;
545: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 546: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 547: goto bad;
548: }
549: if (hlen > m->m_len) {
550: if ((m = m_pullup(m, hlen)) == 0) {
1.266 thorpej 551: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 552: return;
1.1 cgd 553: }
554: ip = mtod(m, struct ip *);
555: }
1.98 thorpej 556:
1.85 hwr 557: /*
1.99 thorpej 558: * RFC1122: packets with a multicast source address are
1.98 thorpej 559: * not allowed.
1.85 hwr 560: */
561: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 562: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 563: goto bad;
1.129 itojun 564: }
565:
566: /* 127/8 must not appear on wire - RFC1122 */
567: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
568: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 569: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 570: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 571: goto bad;
1.130 itojun 572: }
1.85 hwr 573: }
574:
1.135 thorpej 575: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 576: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 577: M_CSUM_IPv4_BAD)) {
578: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
579: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
580: goto badcsum;
581:
582: case M_CSUM_IPv4:
583: /* Checksum was okay. */
584: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
585: break;
586:
587: default:
1.206 thorpej 588: /*
589: * Must compute it ourselves. Maybe skip checksum on
590: * loopback interfaces.
591: */
592: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
593: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
594: INET_CSUM_COUNTER_INCR(&ip_swcsum);
595: if (in_cksum(m, hlen) != 0)
596: goto badcsum;
597: }
1.135 thorpej 598: break;
1.1 cgd 599: }
600:
1.121 thorpej 601: /* Retrieve the packet length. */
602: len = ntohs(ip->ip_len);
1.81 proff 603:
604: /*
605: * Check for additional length bogosity
606: */
1.84 proff 607: if (len < hlen) {
1.266 thorpej 608: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 609: goto bad;
610: }
1.1 cgd 611:
612: /*
613: * Check that the amount of data in the buffers
614: * is as at least much as the IP header would have us expect.
615: * Trim mbufs if longer than we expect.
616: * Drop packet if shorter than we expect.
617: */
1.35 mycroft 618: if (m->m_pkthdr.len < len) {
1.266 thorpej 619: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 620: goto bad;
621: }
1.35 mycroft 622: if (m->m_pkthdr.len > len) {
1.1 cgd 623: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 624: m->m_len = len;
625: m->m_pkthdr.len = len;
1.1 cgd 626: } else
1.35 mycroft 627: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 628: }
629:
1.193 scw 630: #if defined(IPSEC)
1.149 wiz 631: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 632: m->m_flags &= ~M_CANFASTFWD;
633: #else
1.64 thorpej 634: /*
635: * Assume that we can create a fast-forward IP flow entry
636: * based on this packet.
637: */
638: m->m_flags |= M_CANFASTFWD;
1.94 itojun 639: #endif
1.64 thorpej 640:
1.36 mrg 641: #ifdef PFIL_HOOKS
1.33 mrg 642: /*
1.64 thorpej 643: * Run through list of hooks for input packets. If there are any
644: * filters which require that additional packets in the flow are
645: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
646: * Note that filters must _never_ set this flag, as another filter
647: * in the list may have previously cleared it.
1.33 mrg 648: */
1.127 itojun 649: /*
650: * let ipfilter look at packet on the wire,
651: * not the decapsulated packet.
652: */
653: #ifdef IPSEC
1.136 itojun 654: if (!ipsec_getnhist(m))
1.186 scw 655: #elif defined(FAST_IPSEC)
656: if (!ipsec_indone(m))
1.127 itojun 657: #else
658: if (1)
659: #endif
660: {
1.169 itojun 661: struct in_addr odst;
662:
663: odst = ip->ip_dst;
1.127 itojun 664: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 665: PFIL_IN) != 0)
666: return;
1.127 itojun 667: if (m == NULL)
668: return;
669: ip = mtod(m, struct ip *);
1.142 darrenr 670: hlen = ip->ip_hl << 2;
1.205 darrenr 671: /*
672: * XXX The setting of "srcrt" here is to prevent ip_forward()
673: * from generating ICMP redirects for packets that have
674: * been redirected by a hook back out on to the same LAN that
675: * they came from and is not an indication that the packet
676: * is being inffluenced by source routing options. This
677: * allows things like
678: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
679: * where tlp0 is both on the 1.1.1.0/24 network and is the
680: * default route for hosts on 1.1.1.0/24. Of course this
681: * also requires a "map tlp0 ..." to complete the story.
682: * One might argue whether or not this kind of network config.
1.212 perry 683: * should be supported in this manner...
1.205 darrenr 684: */
1.169 itojun 685: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 686: }
1.36 mrg 687: #endif /* PFIL_HOOKS */
1.123 thorpej 688:
689: #ifdef ALTQ
690: /* XXX Temporary until ALTQ is changed to use a pfil hook */
691: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
692: /* packet dropped by traffic conditioner */
693: return;
694: }
695: #endif
1.121 thorpej 696:
697: /*
1.1 cgd 698: * Process options and, if not destined for us,
699: * ship it on. ip_dooptions returns 1 when an
700: * error was detected (causing an icmp message
701: * to be sent and the original packet to be freed).
702: */
703: ip_nhops = 0; /* for source routed packets */
704: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 705: return;
1.1 cgd 706:
707: /*
1.165 christos 708: * Enable a consistency check between the destination address
709: * and the arrival interface for a unicast packet (the RFC 1122
710: * strong ES model) if IP forwarding is disabled and the packet
711: * is not locally generated.
712: *
713: * XXX - Checking also should be disabled if the destination
714: * address is ipnat'ed to a different interface.
715: *
716: * XXX - Checking is incompatible with IP aliases added
717: * to the loopback interface instead of the interface where
718: * the packets are received.
719: *
720: * XXX - We need to add a per ifaddr flag for this so that
721: * we get finer grain control.
722: */
723: checkif = ip_checkinterface && (ipforwarding == 0) &&
724: (m->m_pkthdr.rcvif != NULL) &&
725: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
726:
727: /*
1.1 cgd 728: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 729: *
730: * Traditional 4.4BSD did not consult IFF_UP at all.
731: * The behavior here is to treat addresses on !IFF_UP interface
732: * as not mine.
1.1 cgd 733: */
1.100 itojun 734: downmatch = 0;
1.140 matt 735: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 736: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 737: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
738: continue;
1.97 itojun 739: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
740: break;
1.100 itojun 741: else
742: downmatch++;
1.97 itojun 743: }
744: }
1.86 thorpej 745: if (ia != NULL)
746: goto ours;
1.225 christos 747: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 748: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 749: if (ifa->ifa_addr->sa_family != AF_INET)
750: continue;
1.57 tls 751: ia = ifatoia(ifa);
1.35 mycroft 752: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
753: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 754: /*
755: * Look for all-0's host part (old broadcast addr),
756: * either for subnet or net.
757: */
758: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 759: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 760: goto ours;
1.57 tls 761: /*
762: * An interface with IP address zero accepts
763: * all packets that arrive on that interface.
764: */
765: if (in_nullhost(ia->ia_addr.sin_addr))
766: goto ours;
1.1 cgd 767: }
768: }
1.18 mycroft 769: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 770: struct in_multi *inm;
771: #ifdef MROUTING
772: extern struct socket *ip_mrouter;
1.10 brezak 773:
1.4 hpeyerl 774: if (ip_mrouter) {
775: /*
776: * If we are acting as a multicast router, all
777: * incoming multicast packets are passed to the
778: * kernel-level multicast forwarding function.
779: * The packet is returned (relatively) intact; if
780: * ip_mforward() returns a non-zero value, the packet
781: * must be discarded, else it may be accepted below.
782: *
783: * (The IP ident field is put in the same byte order
784: * as expected when ip_mforward() is called from
785: * ip_output().)
786: */
1.13 mycroft 787: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 788: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 789: m_freem(m);
1.89 itojun 790: return;
1.4 hpeyerl 791: }
792:
793: /*
794: * The process-level routing demon needs to receive
795: * all multicast IGMP packets, whether or not this
796: * host belongs to their destination groups.
797: */
798: if (ip->ip_p == IPPROTO_IGMP)
799: goto ours;
1.266 thorpej 800: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 801: }
802: #endif
803: /*
804: * See if we belong to the destination multicast group on the
805: * arrival interface.
806: */
807: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
808: if (inm == NULL) {
1.266 thorpej 809: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 810: m_freem(m);
1.89 itojun 811: return;
1.4 hpeyerl 812: }
813: goto ours;
814: }
1.19 mycroft 815: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 816: in_nullhost(ip->ip_dst))
1.1 cgd 817: goto ours;
818:
819: /*
820: * Not for us; forward if possible and desirable.
821: */
822: if (ipforwarding == 0) {
1.266 thorpej 823: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 824: m_freem(m);
1.100 itojun 825: } else {
826: /*
827: * If ip_dst matched any of my address on !IFF_UP interface,
828: * and there's no IFF_UP interface that matches ip_dst,
829: * send icmp unreach. Forwarding it will result in in-kernel
830: * forwarding loop till TTL goes to 0.
831: */
832: if (downmatch) {
833: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 834: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 835: return;
836: }
1.145 itojun 837: #ifdef IPSEC
838: if (ipsec4_in_reject(m, NULL)) {
1.267 ! thorpej 839: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.145 itojun 840: goto bad;
841: }
842: #endif
1.173 jonathan 843: #ifdef FAST_IPSEC
844: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
845: s = splsoftnet();
846: if (mtag != NULL) {
847: tdbi = (struct tdb_ident *)(mtag + 1);
848: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
849: } else {
850: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 851: IP_FORWARDING, &error);
1.173 jonathan 852: }
853: if (sp == NULL) { /* NB: can happen if error */
854: splx(s);
855: /*XXX error stat???*/
856: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
857: goto bad;
858: }
859:
860: /*
861: * Check security policy against packet attributes.
862: */
863: error = ipsec_in_reject(sp, m);
864: KEY_FREESP(&sp);
865: splx(s);
866: if (error) {
1.266 thorpej 867: IP_STATINC(IP_STAT_CANTFORWARD);
1.173 jonathan 868: goto bad;
1.193 scw 869: }
870:
871: /*
872: * Peek at the outbound SP for this packet to determine if
873: * it's a Fast Forward candidate.
874: */
875: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
876: if (mtag != NULL)
877: m->m_flags &= ~M_CANFASTFWD;
878: else {
879: s = splsoftnet();
880: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
881: (IP_FORWARDING |
882: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
883: &error, NULL);
884: if (sp != NULL) {
885: m->m_flags &= ~M_CANFASTFWD;
886: KEY_FREESP(&sp);
887: }
888: splx(s);
1.173 jonathan 889: }
890: #endif /* FAST_IPSEC */
1.145 itojun 891:
1.169 itojun 892: ip_forward(m, srcrt);
1.100 itojun 893: }
1.89 itojun 894: return;
1.1 cgd 895:
896: ours:
897: /*
898: * If offset or IP_MF are set, must reassemble.
899: * Otherwise, nothing need be done.
900: * (We could look in the reassembly queue to see
901: * if the packet was previously fragmented,
902: * but it's not worth the time; just let them time out.)
903: */
1.155 itojun 904: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258 matt 905: uint16_t off;
906: /*
907: * Prevent TCP blind data attacks by not allowing non-initial
908: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 909: * size) and making sure the first fragment is at least 68
910: * bytes.
1.258 matt 911: */
1.260 matt 912: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 913: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.266 thorpej 914: IP_STATINC(IP_STAT_BADFRAGS);
1.258 matt 915: goto bad;
916: }
1.1 cgd 917: /*
918: * Look for queue of fragments
919: * of this datagram.
920: */
1.75 thorpej 921: IPQ_LOCK();
1.190 jonathan 922: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250 dyoung 923: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1 cgd 924: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 925: in_hosteq(ip->ip_src, fp->ipq_src) &&
926: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260 matt 927: ip->ip_p == fp->ipq_p) {
928: /*
929: * Make sure the TOS is matches previous
930: * fragments.
931: */
932: if (ip->ip_tos != fp->ipq_tos) {
1.266 thorpej 933: IP_STATINC(IP_STAT_BADFRAGS);
1.260 matt 934: goto bad;
935: }
1.1 cgd 936: goto found;
1.260 matt 937: }
1.190 jonathan 938: }
1.1 cgd 939: fp = 0;
940: found:
941:
942: /*
943: * Adjust ip_len to not reflect header,
1.25 cgd 944: * set ipqe_mff if more fragments are expected,
1.1 cgd 945: * convert offset of this to bytes.
946: */
1.155 itojun 947: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
948: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 949: if (mff) {
1.16 cgd 950: /*
951: * Make sure that fragments have a data length
952: * that's a non-zero multiple of 8 bytes.
953: */
1.155 itojun 954: if (ntohs(ip->ip_len) == 0 ||
955: (ntohs(ip->ip_len) & 0x7) != 0) {
1.266 thorpej 956: IP_STATINC(IP_STAT_BADFRAGS);
1.75 thorpej 957: IPQ_UNLOCK();
1.16 cgd 958: goto bad;
959: }
960: }
1.155 itojun 961: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 962:
963: /*
964: * If datagram marked as having more fragments
965: * or if this is not the first fragment,
966: * attempt reassembly; if it succeeds, proceed.
967: */
1.155 itojun 968: if (mff || ip->ip_off != htons(0)) {
1.266 thorpej 969: IP_STATINC(IP_STAT_FRAGMENTS);
1.233 tls 970: s = splvm();
1.72 thorpej 971: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 972: splx(s);
1.25 cgd 973: if (ipqe == NULL) {
1.266 thorpej 974: IP_STATINC(IP_STAT_RCVMEMDROP);
1.75 thorpej 975: IPQ_UNLOCK();
1.25 cgd 976: goto bad;
977: }
978: ipqe->ipqe_mff = mff;
1.50 thorpej 979: ipqe->ipqe_m = m;
1.25 cgd 980: ipqe->ipqe_ip = ip;
1.190 jonathan 981: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 982: if (m == 0) {
983: IPQ_UNLOCK();
1.89 itojun 984: return;
1.75 thorpej 985: }
1.266 thorpej 986: IP_STATINC(IP_STAT_REASSEMBLED);
1.50 thorpej 987: ip = mtod(m, struct ip *);
1.74 thorpej 988: hlen = ip->ip_hl << 2;
1.155 itojun 989: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 990: } else
991: if (fp)
992: ip_freef(fp);
1.75 thorpej 993: IPQ_UNLOCK();
1.79 mycroft 994: }
1.128 itojun 995:
1.173 jonathan 996: #if defined(IPSEC)
1.128 itojun 997: /*
998: * enforce IPsec policy checking if we are seeing last header.
999: * note that we do not visit this with protocols with pcb layer
1000: * code - like udp/tcp/raw ip.
1001: */
1002: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
1003: ipsec4_in_reject(m, NULL)) {
1.267 ! thorpej 1004: IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.128 itojun 1005: goto bad;
1006: }
1007: #endif
1.226 liamjfoy 1008: #ifdef FAST_IPSEC
1.173 jonathan 1009: /*
1010: * enforce IPsec policy checking if we are seeing last header.
1011: * note that we do not visit this with protocols with pcb layer
1012: * code - like udp/tcp/raw ip.
1013: */
1014: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1015: /*
1016: * Check if the packet has already had IPsec processing
1017: * done. If so, then just pass it along. This tag gets
1018: * set during AH, ESP, etc. input handling, before the
1019: * packet is returned to the ip input queue for delivery.
1.212 perry 1020: */
1.173 jonathan 1021: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1022: s = splsoftnet();
1023: if (mtag != NULL) {
1024: tdbi = (struct tdb_ident *)(mtag + 1);
1025: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1026: } else {
1027: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1028: IP_FORWARDING, &error);
1.173 jonathan 1029: }
1030: if (sp != NULL) {
1031: /*
1032: * Check security policy against packet attributes.
1033: */
1034: error = ipsec_in_reject(sp, m);
1035: KEY_FREESP(&sp);
1036: } else {
1037: /* XXX error stat??? */
1038: error = EINVAL;
1039: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1040: }
1041: splx(s);
1042: if (error)
1043: goto bad;
1044: }
1045: #endif /* FAST_IPSEC */
1.1 cgd 1046:
1047: /*
1048: * Switch out to protocol's input routine.
1049: */
1.82 aidan 1050: #if IFA_STATS
1.122 itojun 1051: if (ia && ip)
1.155 itojun 1052: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1053: #endif
1.266 thorpej 1054: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 1055: {
1056: int off = hlen, nh = ip->ip_p;
1057:
1058: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1059: return;
1060: }
1.1 cgd 1061: bad:
1062: m_freem(m);
1.135 thorpej 1063: return;
1064:
1065: badcsum:
1.266 thorpej 1066: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 1067: m_freem(m);
1.1 cgd 1068: }
1069:
1070: /*
1071: * Take incoming datagram fragment and try to
1072: * reassemble it into whole datagram. If a chain for
1073: * reassembly of this datagram already exists, then it
1074: * is given as fp; otherwise have to make a chain.
1075: */
1.50 thorpej 1076: struct mbuf *
1.211 perry 1077: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1078: {
1.109 augustss 1079: struct mbuf *m = ipqe->ipqe_m;
1080: struct ipqent *nq, *p, *q;
1.25 cgd 1081: struct ip *ip;
1.1 cgd 1082: struct mbuf *t;
1.25 cgd 1083: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1084: int i, next, s;
1.1 cgd 1085:
1.75 thorpej 1086: IPQ_LOCK_CHECK();
1087:
1.1 cgd 1088: /*
1089: * Presence of header sizes in mbufs
1090: * would confuse code below.
1091: */
1092: m->m_data += hlen;
1093: m->m_len -= hlen;
1094:
1.194 jonathan 1095: #ifdef notyet
1096: /* make sure fragment limit is up-to-date */
1097: CHECK_NMBCLUSTER_PARAMS();
1098:
1099: /* If we have too many fragments, drop the older half. */
1100: if (ip_nfrags >= ip_maxfrags)
1101: ip_reass_drophalf(void);
1102: #endif
1103:
1.1 cgd 1104: /*
1.192 jonathan 1105: * We are about to add a fragment; increment frag count.
1106: */
1107: ip_nfrags++;
1.212 perry 1108:
1.192 jonathan 1109: /*
1.1 cgd 1110: * If first fragment to arrive, create a reassembly queue.
1111: */
1112: if (fp == 0) {
1.131 itojun 1113: /*
1114: * Enforce upper bound on number of fragmented packets
1115: * for which we attempt reassembly;
1116: * If maxfrag is 0, never accept fragments.
1117: * If maxfrag is -1, accept all fragments without limitation.
1118: */
1119: if (ip_maxfragpackets < 0)
1120: ;
1121: else if (ip_nfragpackets >= ip_maxfragpackets)
1122: goto dropfrag;
1123: ip_nfragpackets++;
1.50 thorpej 1124: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1125: M_FTABLE, M_NOWAIT);
1126: if (fp == NULL)
1.1 cgd 1127: goto dropfrag;
1.190 jonathan 1128: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1129: fp->ipq_nfrags = 1;
1.1 cgd 1130: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1131: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1132: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260 matt 1133: fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148 matt 1134: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1135: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1136: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1137: p = NULL;
1.1 cgd 1138: goto insert;
1.192 jonathan 1139: } else {
1140: fp->ipq_nfrags++;
1.1 cgd 1141: }
1142:
1143: /*
1144: * Find a segment which begins after this one does.
1145: */
1.148 matt 1146: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1147: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1148: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1149: break;
1150:
1151: /*
1152: * If there is a preceding segment, it may provide some of
1153: * our data already. If so, drop the data from the incoming
1154: * segment. If it provides all of our data, drop us.
1155: */
1.25 cgd 1156: if (p != NULL) {
1.155 itojun 1157: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1158: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1159: if (i > 0) {
1.155 itojun 1160: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1161: goto dropfrag;
1.50 thorpej 1162: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1163: ipqe->ipqe_ip->ip_off =
1164: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1165: ipqe->ipqe_ip->ip_len =
1166: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1167: }
1168: }
1169:
1170: /*
1171: * While we overlap succeeding segments trim them or,
1172: * if they are completely covered, dequeue them.
1173: */
1.155 itojun 1174: for (; q != NULL &&
1175: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1176: ntohs(q->ipqe_ip->ip_off); q = nq) {
1177: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1178: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1179: if (i < ntohs(q->ipqe_ip->ip_len)) {
1180: q->ipqe_ip->ip_len =
1181: htons(ntohs(q->ipqe_ip->ip_len) - i);
1182: q->ipqe_ip->ip_off =
1183: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1184: m_adj(q->ipqe_m, i);
1.1 cgd 1185: break;
1186: }
1.148 matt 1187: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1188: m_freem(q->ipqe_m);
1.148 matt 1189: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1190: s = splvm();
1.72 thorpej 1191: pool_put(&ipqent_pool, q);
1.233 tls 1192: splx(s);
1.192 jonathan 1193: fp->ipq_nfrags--;
1194: ip_nfrags--;
1.1 cgd 1195: }
1196:
1197: insert:
1198: /*
1199: * Stick new segment in its place;
1200: * check for complete reassembly.
1201: */
1.25 cgd 1202: if (p == NULL) {
1.148 matt 1203: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1204: } else {
1.148 matt 1205: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1206: }
1.1 cgd 1207: next = 0;
1.148 matt 1208: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1209: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1210: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1211: return (0);
1.155 itojun 1212: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1213: }
1.25 cgd 1214: if (p->ipqe_mff)
1.1 cgd 1215: return (0);
1216:
1217: /*
1.41 thorpej 1218: * Reassembly is complete. Check for a bogus message size and
1219: * concatenate fragments.
1.1 cgd 1220: */
1.148 matt 1221: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1222: ip = q->ipqe_ip;
1.41 thorpej 1223: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1.266 thorpej 1224: IP_STATINC(IP_STAT_TOOLONG);
1.41 thorpej 1225: ip_freef(fp);
1226: return (0);
1227: }
1.50 thorpej 1228: m = q->ipqe_m;
1.1 cgd 1229: t = m->m_next;
1230: m->m_next = 0;
1231: m_cat(m, t);
1.148 matt 1232: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1233: s = splvm();
1.72 thorpej 1234: pool_put(&ipqent_pool, q);
1.233 tls 1235: splx(s);
1.25 cgd 1236: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1237: t = q->ipqe_m;
1.148 matt 1238: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1239: s = splvm();
1.72 thorpej 1240: pool_put(&ipqent_pool, q);
1.233 tls 1241: splx(s);
1.1 cgd 1242: m_cat(m, t);
1243: }
1.192 jonathan 1244: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1245:
1246: /*
1247: * Create header for new ip packet by
1248: * modifying header of first packet;
1249: * dequeue and discard fragment reassembly header.
1250: * Make header visible.
1251: */
1.155 itojun 1252: ip->ip_len = htons(next);
1.25 cgd 1253: ip->ip_src = fp->ipq_src;
1254: ip->ip_dst = fp->ipq_dst;
1255: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1256: FREE(fp, M_FTABLE);
1.131 itojun 1257: ip_nfragpackets--;
1.1 cgd 1258: m->m_len += (ip->ip_hl << 2);
1259: m->m_data -= (ip->ip_hl << 2);
1260: /* some debugging cruft by sklower, below, will go away soon */
1261: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1262: int plen = 0;
1.50 thorpej 1263: for (t = m; t; t = t->m_next)
1264: plen += t->m_len;
1265: m->m_pkthdr.len = plen;
1.213 yamt 1266: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1267: }
1.50 thorpej 1268: return (m);
1.1 cgd 1269:
1270: dropfrag:
1.192 jonathan 1271: if (fp != 0)
1272: fp->ipq_nfrags--;
1273: ip_nfrags--;
1.266 thorpej 1274: IP_STATINC(IP_STAT_FRAGDROPPED);
1.1 cgd 1275: m_freem(m);
1.233 tls 1276: s = splvm();
1.72 thorpej 1277: pool_put(&ipqent_pool, ipqe);
1.233 tls 1278: splx(s);
1.1 cgd 1279: return (0);
1280: }
1281:
1282: /*
1283: * Free a fragment reassembly header and all
1284: * associated datagrams.
1285: */
1.8 mycroft 1286: void
1.211 perry 1287: ip_freef(struct ipq *fp)
1.1 cgd 1288: {
1.109 augustss 1289: struct ipqent *q, *p;
1.192 jonathan 1290: u_int nfrags = 0;
1.233 tls 1291: int s;
1.1 cgd 1292:
1.75 thorpej 1293: IPQ_LOCK_CHECK();
1294:
1.148 matt 1295: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1296: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1297: m_freem(q->ipqe_m);
1.192 jonathan 1298: nfrags++;
1.148 matt 1299: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1300: s = splvm();
1.72 thorpej 1301: pool_put(&ipqent_pool, q);
1.233 tls 1302: splx(s);
1.1 cgd 1303: }
1.192 jonathan 1304:
1305: if (nfrags != fp->ipq_nfrags)
1306: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1307: ip_nfrags -= nfrags;
1.25 cgd 1308: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1309: FREE(fp, M_FTABLE);
1.131 itojun 1310: ip_nfragpackets--;
1.1 cgd 1311: }
1312:
1313: /*
1.194 jonathan 1314: * IP reassembly TTL machinery for multiplicative drop.
1315: */
1316: static u_int fragttl_histo[(IPFRAGTTL+1)];
1317:
1318:
1319: /*
1320: * Decrement TTL of all reasembly queue entries by `ticks'.
1321: * Count number of distinct fragments (as opposed to partial, fragmented
1322: * datagrams) in the reassembly queue. While we traverse the entire
1323: * reassembly queue, compute and return the median TTL over all fragments.
1324: */
1325: static u_int
1326: ip_reass_ttl_decr(u_int ticks)
1327: {
1.198 matt 1328: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1329: struct ipq *fp, *nfp;
1.198 matt 1330: int i;
1.212 perry 1331:
1.194 jonathan 1332: nfrags = 0;
1333: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1334:
1.194 jonathan 1335: for (i = 0; i < IPREASS_NHASH; i++) {
1336: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1337: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1338: 0 : fp->ipq_ttl - ticks);
1339: nfp = LIST_NEXT(fp, ipq_q);
1340: if (fp->ipq_ttl == 0) {
1.266 thorpej 1341: IP_STATINC(IP_STAT_FRAGTIMEOUT);
1.194 jonathan 1342: ip_freef(fp);
1343: } else {
1344: nfrags += fp->ipq_nfrags;
1345: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1346: }
1347: }
1348: }
1349:
1350: KASSERT(ip_nfrags == nfrags);
1351:
1352: /* Find median (or other drop fraction) in histogram. */
1353: dropfraction = (ip_nfrags / 2);
1354: keepfraction = ip_nfrags - dropfraction;
1355: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1356: median += fragttl_histo[i];
1357: if (median >= keepfraction)
1358: break;
1359: }
1360:
1361: /* Return TTL of median (or other fraction). */
1362: return (u_int)i;
1363: }
1364:
1365: void
1366: ip_reass_drophalf(void)
1367: {
1368:
1369: u_int median_ticks;
1370: /*
1371: * Compute median TTL of all fragments, and count frags
1372: * with that TTL or lower (roughly half of all fragments).
1373: */
1374: median_ticks = ip_reass_ttl_decr(0);
1375:
1376: /* Drop half. */
1377: median_ticks = ip_reass_ttl_decr(median_ticks);
1378:
1379: }
1380:
1381: /*
1.1 cgd 1382: * IP timer processing;
1383: * if a timer expires on a reassembly
1384: * queue, discard it.
1385: */
1.8 mycroft 1386: void
1.211 perry 1387: ip_slowtimo(void)
1.1 cgd 1388: {
1.191 jonathan 1389: static u_int dropscanidx = 0;
1390: u_int i;
1.194 jonathan 1391: u_int median_ttl;
1.24 mycroft 1392: int s = splsoftnet();
1.1 cgd 1393:
1.75 thorpej 1394: IPQ_LOCK();
1.194 jonathan 1395:
1396: /* Age TTL of all fragments by 1 tick .*/
1397: median_ttl = ip_reass_ttl_decr(1);
1398:
1399: /* make sure fragment limit is up-to-date */
1400: CHECK_NMBCLUSTER_PARAMS();
1401:
1402: /* If we have too many fragments, drop the older half. */
1403: if (ip_nfrags > ip_maxfrags)
1404: ip_reass_ttl_decr(median_ttl);
1405:
1.131 itojun 1406: /*
1.194 jonathan 1407: * If we are over the maximum number of fragmented packets
1.131 itojun 1408: * (due to the limit being lowered), drain off
1.190 jonathan 1409: * enough to get down to the new limit. Start draining
1410: * from the reassembly hashqueue most recently drained.
1.131 itojun 1411: */
1412: if (ip_maxfragpackets < 0)
1413: ;
1414: else {
1.190 jonathan 1415: int wrapped = 0;
1416:
1417: i = dropscanidx;
1418: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1419: while (LIST_FIRST(&ipq[i]) != NULL)
1420: ip_freef(LIST_FIRST(&ipq[i]));
1421: if (++i >= IPREASS_NHASH) {
1422: i = 0;
1423: }
1424: /*
1425: * Dont scan forever even if fragment counters are
1426: * wrong: stop after scanning entire reassembly queue.
1427: */
1428: if (i == dropscanidx)
1429: wrapped = 1;
1430: }
1431: dropscanidx = i;
1.131 itojun 1432: }
1.75 thorpej 1433: IPQ_UNLOCK();
1.1 cgd 1434: splx(s);
1435: }
1436:
1437: /*
1438: * Drain off all datagram fragments.
1439: */
1.8 mycroft 1440: void
1.211 perry 1441: ip_drain(void)
1.1 cgd 1442: {
1443:
1.75 thorpej 1444: /*
1445: * We may be called from a device's interrupt context. If
1446: * the ipq is already busy, just bail out now.
1447: */
1448: if (ipq_lock_try() == 0)
1449: return;
1450:
1.194 jonathan 1451: /*
1452: * Drop half the total fragments now. If more mbufs are needed,
1453: * we will be called again soon.
1454: */
1455: ip_reass_drophalf();
1.75 thorpej 1456:
1457: IPQ_UNLOCK();
1.1 cgd 1458: }
1459:
1460: /*
1461: * Do option processing on a datagram,
1462: * possibly discarding it if bad options are encountered,
1463: * or forwarding it if source-routed.
1464: * Returns 1 if packet has been forwarded/freed,
1465: * 0 if the packet should be processed further.
1466: */
1.8 mycroft 1467: int
1.211 perry 1468: ip_dooptions(struct mbuf *m)
1.1 cgd 1469: {
1.109 augustss 1470: struct ip *ip = mtod(m, struct ip *);
1471: u_char *cp, *cp0;
1472: struct ip_timestamp *ipt;
1473: struct in_ifaddr *ia;
1.1 cgd 1474: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1475: struct in_addr dst;
1.1 cgd 1476: n_time ntime;
1477:
1.13 mycroft 1478: dst = ip->ip_dst;
1.1 cgd 1479: cp = (u_char *)(ip + 1);
1480: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1481: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1482: opt = cp[IPOPT_OPTVAL];
1483: if (opt == IPOPT_EOL)
1484: break;
1485: if (opt == IPOPT_NOP)
1486: optlen = 1;
1487: else {
1.113 itojun 1488: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1489: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1490: goto bad;
1491: }
1.1 cgd 1492: optlen = cp[IPOPT_OLEN];
1.114 itojun 1493: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1494: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1495: goto bad;
1496: }
1497: }
1498: switch (opt) {
1499:
1500: default:
1501: break;
1502:
1503: /*
1504: * Source routing with record.
1505: * Find interface with current destination address.
1506: * If none on this machine then drop if strictly routed,
1507: * or do nothing if loosely routed.
1508: * Record interface address and bring up next address
1509: * component. If strictly routed make sure next
1510: * address is on directly accessible net.
1511: */
1512: case IPOPT_LSRR:
1513: case IPOPT_SSRR:
1.47 cjs 1514: if (ip_allowsrcrt == 0) {
1515: type = ICMP_UNREACH;
1516: code = ICMP_UNREACH_NET_PROHIB;
1517: goto bad;
1518: }
1.114 itojun 1519: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1520: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1521: goto bad;
1522: }
1.1 cgd 1523: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1524: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1525: goto bad;
1526: }
1527: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1528: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1529: if (ia == 0) {
1530: if (opt == IPOPT_SSRR) {
1531: type = ICMP_UNREACH;
1532: code = ICMP_UNREACH_SRCFAIL;
1533: goto bad;
1534: }
1535: /*
1536: * Loose routing, and not at next destination
1537: * yet; nothing to do except forward.
1538: */
1539: break;
1540: }
1541: off--; /* 0 origin */
1.112 sommerfe 1542: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1543: /*
1544: * End of source route. Should be for us.
1545: */
1546: save_rte(cp, ip->ip_src);
1547: break;
1548: }
1549: /*
1550: * locate outgoing interface
1551: */
1.244 christos 1552: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1 cgd 1553: sizeof(ipaddr.sin_addr));
1.96 thorpej 1554: if (opt == IPOPT_SSRR)
1.196 itojun 1555: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1556: else
1.1 cgd 1557: ia = ip_rtaddr(ipaddr.sin_addr);
1558: if (ia == 0) {
1559: type = ICMP_UNREACH;
1560: code = ICMP_UNREACH_SRCFAIL;
1561: goto bad;
1562: }
1563: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1564: bcopy((void *)&ia->ia_addr.sin_addr,
1565: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1566: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1567: /*
1568: * Let ip_intr's mcast routing check handle mcast pkts
1569: */
1.18 mycroft 1570: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1571: break;
1572:
1573: case IPOPT_RR:
1.114 itojun 1574: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1575: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1576: goto bad;
1577: }
1.1 cgd 1578: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1579: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1580: goto bad;
1581: }
1582: /*
1583: * If no space remains, ignore.
1584: */
1585: off--; /* 0 origin */
1.112 sommerfe 1586: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1587: break;
1.244 christos 1588: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1 cgd 1589: sizeof(ipaddr.sin_addr));
1590: /*
1591: * locate outgoing interface; if we're the destination,
1592: * use the incoming interface (should be same).
1593: */
1.96 thorpej 1594: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1595: == NULL &&
1596: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1597: type = ICMP_UNREACH;
1598: code = ICMP_UNREACH_HOST;
1599: goto bad;
1600: }
1.244 christos 1601: bcopy((void *)&ia->ia_addr.sin_addr,
1602: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1603: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1604: break;
1605:
1606: case IPOPT_TS:
1607: code = cp - (u_char *)ip;
1608: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1609: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1610: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1611: goto bad;
1.114 itojun 1612: }
1613: if (ipt->ipt_ptr < 5) {
1614: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1615: goto bad;
1616: }
1.15 cgd 1617: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1618: if (++ipt->ipt_oflw == 0) {
1619: code = (u_char *)&ipt->ipt_ptr -
1620: (u_char *)ip;
1.1 cgd 1621: goto bad;
1.114 itojun 1622: }
1.1 cgd 1623: break;
1624: }
1.104 thorpej 1625: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1626: switch (ipt->ipt_flg) {
1627:
1628: case IPOPT_TS_TSONLY:
1629: break;
1630:
1631: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1632: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1633: sizeof(struct in_addr) > ipt->ipt_len) {
1634: code = (u_char *)&ipt->ipt_ptr -
1635: (u_char *)ip;
1.1 cgd 1636: goto bad;
1.114 itojun 1637: }
1.13 mycroft 1638: ipaddr.sin_addr = dst;
1.96 thorpej 1639: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1640: m->m_pkthdr.rcvif));
1.13 mycroft 1641: if (ia == 0)
1642: continue;
1.104 thorpej 1643: bcopy(&ia->ia_addr.sin_addr,
1644: cp0, sizeof(struct in_addr));
1.1 cgd 1645: ipt->ipt_ptr += sizeof(struct in_addr);
1646: break;
1647:
1648: case IPOPT_TS_PRESPEC:
1.66 thorpej 1649: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1650: sizeof(struct in_addr) > ipt->ipt_len) {
1651: code = (u_char *)&ipt->ipt_ptr -
1652: (u_char *)ip;
1.1 cgd 1653: goto bad;
1.114 itojun 1654: }
1.104 thorpej 1655: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1656: sizeof(struct in_addr));
1.96 thorpej 1657: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1658: == NULL)
1.1 cgd 1659: continue;
1660: ipt->ipt_ptr += sizeof(struct in_addr);
1661: break;
1662:
1663: default:
1.114 itojun 1664: /* XXX can't take &ipt->ipt_flg */
1665: code = (u_char *)&ipt->ipt_ptr -
1666: (u_char *)ip + 1;
1.1 cgd 1667: goto bad;
1668: }
1669: ntime = iptime();
1.107 thorpej 1670: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1671: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1672: sizeof(n_time));
1673: ipt->ipt_ptr += sizeof(n_time);
1674: }
1675: }
1676: if (forward) {
1.26 thorpej 1677: if (ip_forwsrcrt == 0) {
1678: type = ICMP_UNREACH;
1679: code = ICMP_UNREACH_SRCFAIL;
1680: goto bad;
1681: }
1.1 cgd 1682: ip_forward(m, 1);
1683: return (1);
1.13 mycroft 1684: }
1685: return (0);
1.1 cgd 1686: bad:
1.13 mycroft 1687: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1688: IP_STATINC(IP_STAT_BADOPTIONS);
1.1 cgd 1689: return (1);
1690: }
1691:
1692: /*
1693: * Given address of next destination (final or next hop),
1694: * return internet address info of interface to be used to get there.
1695: */
1696: struct in_ifaddr *
1.211 perry 1697: ip_rtaddr(struct in_addr dst)
1.1 cgd 1698: {
1.249 dyoung 1699: struct rtentry *rt;
1700: union {
1701: struct sockaddr dst;
1702: struct sockaddr_in dst4;
1703: } u;
1704:
1705: sockaddr_in_init(&u.dst4, &dst, 0);
1706:
1707: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1708: return NULL;
1709:
1710: return ifatoia(rt->rt_ifa);
1.1 cgd 1711: }
1712:
1713: /*
1714: * Save incoming source route for use in replies,
1715: * to be picked up later by ip_srcroute if the receiver is interested.
1716: */
1.13 mycroft 1717: void
1.211 perry 1718: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1719: {
1720: unsigned olen;
1721:
1722: olen = option[IPOPT_OLEN];
1723: #ifdef DIAGNOSTIC
1724: if (ipprintfs)
1.39 christos 1725: printf("save_rte: olen %d\n", olen);
1.89 itojun 1726: #endif /* 0 */
1.1 cgd 1727: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1728: return;
1.244 christos 1729: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1 cgd 1730: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1731: ip_srcrt.dst = dst;
1732: }
1733:
1734: /*
1735: * Retrieve incoming source route for use in replies,
1736: * in the same form used by setsockopt.
1737: * The first hop is placed before the options, will be removed later.
1738: */
1739: struct mbuf *
1.211 perry 1740: ip_srcroute(void)
1.1 cgd 1741: {
1.109 augustss 1742: struct in_addr *p, *q;
1743: struct mbuf *m;
1.1 cgd 1744:
1745: if (ip_nhops == 0)
1.237 dyoung 1746: return NULL;
1.1 cgd 1747: m = m_get(M_DONTWAIT, MT_SOOPTS);
1748: if (m == 0)
1.237 dyoung 1749: return NULL;
1.1 cgd 1750:
1.164 matt 1751: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1752: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1753:
1754: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1755: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1756: OPTSIZ;
1757: #ifdef DIAGNOSTIC
1758: if (ipprintfs)
1.39 christos 1759: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1760: #endif
1761:
1762: /*
1763: * First save first hop for return route
1764: */
1765: p = &ip_srcrt.route[ip_nhops - 1];
1766: *(mtod(m, struct in_addr *)) = *p--;
1767: #ifdef DIAGNOSTIC
1768: if (ipprintfs)
1.39 christos 1769: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1770: #endif
1771:
1772: /*
1773: * Copy option fields and padding (nop) to mbuf.
1774: */
1775: ip_srcrt.nop = IPOPT_NOP;
1776: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1777: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1778: OPTSIZ);
1779: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1780: sizeof(struct in_addr) + OPTSIZ);
1781: #undef OPTSIZ
1782: /*
1783: * Record return path as an IP source route,
1784: * reversing the path (pointers are now aligned).
1785: */
1786: while (p >= ip_srcrt.route) {
1787: #ifdef DIAGNOSTIC
1788: if (ipprintfs)
1.39 christos 1789: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1790: #endif
1791: *q++ = *p--;
1792: }
1793: /*
1794: * Last hop goes to final destination.
1795: */
1796: *q = ip_srcrt.dst;
1797: #ifdef DIAGNOSTIC
1798: if (ipprintfs)
1.39 christos 1799: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1800: #endif
1801: return (m);
1802: }
1803:
1.139 matt 1804: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1805: [PRC_MSGSIZE] = EMSGSIZE,
1806: [PRC_HOSTDEAD] = EHOSTDOWN,
1807: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1808: [PRC_UNREACH_NET] = EHOSTUNREACH,
1809: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1810: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1811: [PRC_UNREACH_PORT] = ECONNREFUSED,
1812: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1813: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1814: };
1815:
1816: /*
1817: * Forward a packet. If some error occurs return the sender
1818: * an icmp packet. Note we can't always generate a meaningful
1819: * icmp message because icmp doesn't have a large enough repertoire
1820: * of codes and types.
1821: *
1822: * If not forwarding, just drop the packet. This could be confusing
1823: * if ipforwarding was zero but some routing protocol was advancing
1824: * us as a gateway to somewhere. However, we must let the routing
1825: * protocol deal with that.
1826: *
1827: * The srcrt parameter indicates whether the packet is being forwarded
1828: * via a source route.
1829: */
1.13 mycroft 1830: void
1.211 perry 1831: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1832: {
1.109 augustss 1833: struct ip *ip = mtod(m, struct ip *);
1834: struct rtentry *rt;
1.220 christos 1835: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1836: struct mbuf *mcopy;
1.13 mycroft 1837: n_long dest;
1.249 dyoung 1838: union {
1839: struct sockaddr dst;
1840: struct sockaddr_in dst4;
1841: } u;
1.164 matt 1842:
1843: /*
1844: * We are now in the output path.
1845: */
1846: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1847:
1848: /*
1849: * Clear any in-bound checksum flags for this packet.
1850: */
1851: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1852:
1.13 mycroft 1853: dest = 0;
1.1 cgd 1854: #ifdef DIAGNOSTIC
1.224 joerg 1855: if (ipprintfs) {
1856: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1857: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1858: }
1.1 cgd 1859: #endif
1.93 sommerfe 1860: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1861: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1862: m_freem(m);
1863: return;
1864: }
1865: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1866: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1867: return;
1868: }
1869:
1.249 dyoung 1870: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1871: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1872: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1873: return;
1.1 cgd 1874: }
1875:
1876: /*
1.34 mycroft 1877: * Save at most 68 bytes of the packet in case
1.1 cgd 1878: * we need to generate an ICMP message to the src.
1.119 itojun 1879: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1880: */
1.155 itojun 1881: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1882: if (mcopy)
1883: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1884:
1.221 christos 1885: ip->ip_ttl -= IPTTLDEC;
1886:
1.1 cgd 1887: /*
1888: * If forwarding packet using same interface that it came in on,
1889: * perhaps should send a redirect to sender to shortcut a hop.
1890: * Only send redirect if source is sending directly to us,
1891: * and if packet was not source routed (or has any options).
1892: * Also, don't send redirect if forwarding using a default route
1893: * or a route modified by a redirect.
1894: */
1895: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1896: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1897: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1898: ipsendredirects && !srcrt) {
1.19 mycroft 1899: if (rt->rt_ifa &&
1900: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1901: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1902: if (rt->rt_flags & RTF_GATEWAY)
1903: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1904: else
1905: dest = ip->ip_dst.s_addr;
1906: /*
1907: * Router requirements says to only send host
1908: * redirects.
1909: */
1910: type = ICMP_REDIRECT;
1911: code = ICMP_REDIRECT_HOST;
1.1 cgd 1912: #ifdef DIAGNOSTIC
1.77 thorpej 1913: if (ipprintfs)
1914: printf("redirect (%d) to %x\n", code,
1915: (u_int32_t)dest);
1.1 cgd 1916: #endif
1917: }
1918: }
1919:
1.238 dyoung 1920: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1921: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1922: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1923:
1.1 cgd 1924: if (error)
1.266 thorpej 1925: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1926: else {
1.266 thorpej 1927: uint64_t *ips = IP_STAT_GETREF();
1928: ips[IP_STAT_FORWARD]++;
1929: if (type) {
1930: ips[IP_STAT_REDIRECTSENT]++;
1931: IP_STAT_PUTREF();
1932: } else {
1933: IP_STAT_PUTREF();
1.63 matt 1934: if (mcopy) {
1935: #ifdef GATEWAY
1.64 thorpej 1936: if (mcopy->m_flags & M_CANFASTFWD)
1937: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1938: #endif
1.1 cgd 1939: m_freem(mcopy);
1.63 matt 1940: }
1.1 cgd 1941: return;
1942: }
1943: }
1944: if (mcopy == NULL)
1945: return;
1.13 mycroft 1946:
1.1 cgd 1947: switch (error) {
1948:
1949: case 0: /* forwarded, but need redirect */
1950: /* type, code set above */
1951: break;
1952:
1953: case ENETUNREACH: /* shouldn't happen, checked above */
1954: case EHOSTUNREACH:
1955: case ENETDOWN:
1956: case EHOSTDOWN:
1957: default:
1958: type = ICMP_UNREACH;
1959: code = ICMP_UNREACH_HOST;
1960: break;
1961:
1962: case EMSGSIZE:
1963: type = ICMP_UNREACH;
1964: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1965:
1.261 dyoung 1966: if ((rt = rtcache_validate(&ipforward_rt)) != NULL) {
1.263 cube 1967:
1968: #if defined(IPSEC) || defined(FAST_IPSEC)
1969: /*
1970: * If the packet is routed over IPsec tunnel, tell the
1971: * originator the tunnel MTU.
1972: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1973: * XXX quickhack!!!
1974: */
1975:
1.89 itojun 1976: struct secpolicy *sp;
1977: int ipsecerror;
1.95 itojun 1978: size_t ipsechdr;
1.89 itojun 1979: struct route *ro;
1980:
1981: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1982: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1983: &ipsecerror);
1.263 cube 1984: #endif
1.89 itojun 1985:
1.263 cube 1986: destmtu = rt->rt_ifp->if_mtu;
1987: #if defined(IPSEC) || defined(FAST_IPSEC)
1988: if (sp != NULL) {
1.89 itojun 1989: /* count IPsec header size */
1.95 itojun 1990: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1991: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1992:
1993: /*
1994: * find the correct route for outer IPv4
1995: * header, compute tunnel MTU.
1996: */
1.220 christos 1997:
1.89 itojun 1998: if (sp->req != NULL
1.95 itojun 1999: && sp->req->sav != NULL
2000: && sp->req->sav->sah != NULL) {
2001: ro = &sp->req->sav->sah->sa_route;
1.257 dyoung 2002: if (rt && rt->rt_ifp) {
1.220 christos 2003: destmtu =
1.257 dyoung 2004: rt->rt_rmx.rmx_mtu ?
2005: rt->rt_rmx.rmx_mtu :
2006: rt->rt_ifp->if_mtu;
1.220 christos 2007: destmtu -= ipsechdr;
1.89 itojun 2008: }
2009: }
2010:
1.173 jonathan 2011: #ifdef IPSEC
1.89 itojun 2012: key_freesp(sp);
1.173 jonathan 2013: #else
2014: KEY_FREESP(&sp);
2015: #endif
1.89 itojun 2016: }
1.263 cube 2017: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.89 itojun 2018: }
1.266 thorpej 2019: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 2020: break;
2021:
2022: case ENOBUFS:
1.143 itojun 2023: #if 1
2024: /*
2025: * a router should not generate ICMP_SOURCEQUENCH as
2026: * required in RFC1812 Requirements for IP Version 4 Routers.
2027: * source quench could be a big problem under DoS attacks,
1.149 wiz 2028: * or if the underlying interface is rate-limited.
1.143 itojun 2029: */
2030: if (mcopy)
2031: m_freem(mcopy);
2032: return;
2033: #else
1.1 cgd 2034: type = ICMP_SOURCEQUENCH;
2035: code = 0;
2036: break;
1.143 itojun 2037: #endif
1.1 cgd 2038: }
1.220 christos 2039: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2040: }
2041:
2042: void
1.211 perry 2043: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2044: struct mbuf *m)
1.44 thorpej 2045: {
2046:
2047: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2048: struct timeval tv;
2049:
2050: microtime(&tv);
1.244 christos 2051: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2052: SCM_TIMESTAMP, SOL_SOCKET);
2053: if (*mp)
2054: mp = &(*mp)->m_next;
2055: }
2056: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2057: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2058: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2059: if (*mp)
2060: mp = &(*mp)->m_next;
2061: }
2062: #ifdef notyet
2063: /*
2064: * XXX
2065: * Moving these out of udp_input() made them even more broken
2066: * than they already were.
2067: * - fenner@parc.xerox.com
2068: */
2069: /* options were tossed already */
2070: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2071: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2072: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2073: if (*mp)
2074: mp = &(*mp)->m_next;
2075: }
2076: /* ip_srcroute doesn't do what we want here, need to fix */
2077: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2078: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2079: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2080: if (*mp)
2081: mp = &(*mp)->m_next;
2082: }
2083: #endif
2084: if (inp->inp_flags & INP_RECVIF) {
2085: struct sockaddr_dl sdl;
2086:
1.252 dyoung 2087: sockaddr_dl_init(&sdl, sizeof(sdl),
2088: (m->m_pkthdr.rcvif != NULL)
2089: ? m->m_pkthdr.rcvif->if_index
2090: : 0,
2091: 0, NULL, 0, NULL, 0);
1.251 dyoung 2092: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2093: if (*mp)
2094: mp = &(*mp)->m_next;
2095: }
1.13 mycroft 2096: }
2097:
1.189 atatat 2098: /*
1.228 elad 2099: * sysctl helper routine for net.inet.ip.forwsrcrt.
2100: */
2101: static int
2102: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2103: {
2104: int error, tmp;
2105: struct sysctlnode node;
2106:
2107: node = *rnode;
2108: tmp = ip_forwsrcrt;
2109: node.sysctl_data = &tmp;
2110: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2111: if (error || newp == NULL)
2112: return (error);
2113:
1.230 elad 2114: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232 elad 2115: 0, NULL, NULL, NULL))
1.228 elad 2116: return (EPERM);
2117:
2118: ip_forwsrcrt = tmp;
2119:
2120: return (0);
2121: }
2122:
2123: /*
1.189 atatat 2124: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2125: * range of the new value and tweaks timers if it changes.
2126: */
2127: static int
2128: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2129: {
1.189 atatat 2130: int error, tmp;
2131: struct sysctlnode node;
2132:
2133: node = *rnode;
2134: tmp = ip_mtudisc_timeout;
2135: node.sysctl_data = &tmp;
2136: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2137: if (error || newp == NULL)
2138: return (error);
2139: if (tmp < 0)
2140: return (EINVAL);
1.52 thorpej 2141:
1.189 atatat 2142: ip_mtudisc_timeout = tmp;
2143: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2144:
2145: return (0);
2146: }
1.54 lukem 2147:
1.65 matt 2148: #ifdef GATEWAY
1.189 atatat 2149: /*
1.247 liamjfoy 2150: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 2151: */
2152: static int
2153: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2154: {
2155: int s;
1.67 thorpej 2156:
1.217 atatat 2157: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247 liamjfoy 2158: if (s || newp == NULL)
1.189 atatat 2159: return (s);
1.212 perry 2160:
1.189 atatat 2161: s = splsoftnet();
1.265 thorpej 2162: ipflow_prune();
1.189 atatat 2163: splx(s);
1.144 martin 2164:
1.189 atatat 2165: return (0);
2166: }
1.248 liamjfoy 2167:
2168: static int
2169: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
2170: {
2171: int error, tmp;
2172: struct sysctlnode node;
2173:
2174: node = *rnode;
2175: tmp = ip_hashsize;
2176: node.sysctl_data = &tmp;
2177: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2178: if (error || newp == NULL)
2179: return (error);
2180:
2181: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2182: /*
2183: * Can only fail due to malloc()
2184: */
2185: if (ipflow_invalidate_all(tmp))
2186: return ENOMEM;
2187: } else {
2188: /*
2189: * EINVAL if not a power of 2
2190: */
2191: return EINVAL;
2192: }
2193:
2194: return (0);
2195: }
1.189 atatat 2196: #endif /* GATEWAY */
1.117 tron 2197:
1.266 thorpej 2198: static int
2199: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
2200: {
1.267 ! thorpej 2201: netstat_sysctl_context ctx;
1.266 thorpej 2202: uint64_t ips[IP_NSTATS];
2203:
1.267 ! thorpej 2204: ctx.ctx_stat = ipstat_percpu;
! 2205: ctx.ctx_counters = ips;
! 2206: ctx.ctx_ncounters = IP_NSTATS;
! 2207: return (NETSTAT_SYSCTL(&ctx));
1.266 thorpej 2208: }
1.131 itojun 2209:
1.189 atatat 2210: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2211: {
2212: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2213:
1.197 atatat 2214: sysctl_createv(clog, 0, NULL, NULL,
2215: CTLFLAG_PERMANENT,
1.189 atatat 2216: CTLTYPE_NODE, "net", NULL,
2217: NULL, 0, NULL, 0,
2218: CTL_NET, CTL_EOL);
1.197 atatat 2219: sysctl_createv(clog, 0, NULL, NULL,
2220: CTLFLAG_PERMANENT,
1.203 atatat 2221: CTLTYPE_NODE, "inet",
2222: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2223: NULL, 0, NULL, 0,
2224: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2225: sysctl_createv(clog, 0, NULL, NULL,
2226: CTLFLAG_PERMANENT,
1.203 atatat 2227: CTLTYPE_NODE, "ip",
2228: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2229: NULL, 0, NULL, 0,
2230: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2231:
1.197 atatat 2232: sysctl_createv(clog, 0, NULL, NULL,
2233: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2234: CTLTYPE_INT, "forwarding",
2235: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2236: NULL, 0, &ipforwarding, 0,
2237: CTL_NET, PF_INET, IPPROTO_IP,
2238: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2239: sysctl_createv(clog, 0, NULL, NULL,
2240: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2241: CTLTYPE_INT, "redirect",
2242: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2243: NULL, 0, &ipsendredirects, 0,
2244: CTL_NET, PF_INET, IPPROTO_IP,
2245: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2246: sysctl_createv(clog, 0, NULL, NULL,
2247: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2248: CTLTYPE_INT, "ttl",
2249: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2250: NULL, 0, &ip_defttl, 0,
2251: CTL_NET, PF_INET, IPPROTO_IP,
2252: IPCTL_DEFTTL, CTL_EOL);
2253: #ifdef IPCTL_DEFMTU
1.197 atatat 2254: sysctl_createv(clog, 0, NULL, NULL,
2255: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2256: CTLTYPE_INT, "mtu",
2257: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2258: NULL, 0, &ip_mtu, 0,
2259: CTL_NET, PF_INET, IPPROTO_IP,
2260: IPCTL_DEFMTU, CTL_EOL);
2261: #endif /* IPCTL_DEFMTU */
1.197 atatat 2262: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2263: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2264: CTLTYPE_INT, "forwsrcrt",
2265: SYSCTL_DESCR("Enable forwarding of source-routed "
2266: "datagrams"),
1.228 elad 2267: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2268: CTL_NET, PF_INET, IPPROTO_IP,
2269: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2270: sysctl_createv(clog, 0, NULL, NULL,
2271: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2272: CTLTYPE_INT, "directed-broadcast",
2273: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2274: NULL, 0, &ip_directedbcast, 0,
2275: CTL_NET, PF_INET, IPPROTO_IP,
2276: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2277: sysctl_createv(clog, 0, NULL, NULL,
2278: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2279: CTLTYPE_INT, "allowsrcrt",
2280: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2281: NULL, 0, &ip_allowsrcrt, 0,
2282: CTL_NET, PF_INET, IPPROTO_IP,
2283: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2284: sysctl_createv(clog, 0, NULL, NULL,
2285: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2286: CTLTYPE_INT, "subnetsarelocal",
2287: SYSCTL_DESCR("Whether logical subnets are considered "
2288: "local"),
1.189 atatat 2289: NULL, 0, &subnetsarelocal, 0,
2290: CTL_NET, PF_INET, IPPROTO_IP,
2291: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2292: sysctl_createv(clog, 0, NULL, NULL,
2293: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2294: CTLTYPE_INT, "mtudisc",
2295: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2296: NULL, 0, &ip_mtudisc, 0,
2297: CTL_NET, PF_INET, IPPROTO_IP,
2298: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2299: sysctl_createv(clog, 0, NULL, NULL,
2300: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2301: CTLTYPE_INT, "anonportmin",
2302: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2303: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2304: CTL_NET, PF_INET, IPPROTO_IP,
2305: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2306: sysctl_createv(clog, 0, NULL, NULL,
2307: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2308: CTLTYPE_INT, "anonportmax",
2309: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2310: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2311: CTL_NET, PF_INET, IPPROTO_IP,
2312: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2313: sysctl_createv(clog, 0, NULL, NULL,
2314: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2315: CTLTYPE_INT, "mtudisctimeout",
2316: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2317: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2318: CTL_NET, PF_INET, IPPROTO_IP,
2319: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2320: #ifdef GATEWAY
1.197 atatat 2321: sysctl_createv(clog, 0, NULL, NULL,
2322: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2323: CTLTYPE_INT, "maxflows",
2324: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2325: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2326: CTL_NET, PF_INET, IPPROTO_IP,
2327: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2328: sysctl_createv(clog, 0, NULL, NULL,
2329: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2330: CTLTYPE_INT, "hashsize",
2331: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2332: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2333: CTL_NET, PF_INET, IPPROTO_IP,
2334: CTL_CREATE, CTL_EOL);
1.189 atatat 2335: #endif /* GATEWAY */
1.197 atatat 2336: sysctl_createv(clog, 0, NULL, NULL,
2337: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2338: CTLTYPE_INT, "hostzerobroadcast",
2339: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2340: NULL, 0, &hostzeroisbroadcast, 0,
2341: CTL_NET, PF_INET, IPPROTO_IP,
2342: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2343: #if NGIF > 0
1.197 atatat 2344: sysctl_createv(clog, 0, NULL, NULL,
2345: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2346: CTLTYPE_INT, "gifttl",
2347: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2348: NULL, 0, &ip_gif_ttl, 0,
2349: CTL_NET, PF_INET, IPPROTO_IP,
2350: IPCTL_GIF_TTL, CTL_EOL);
2351: #endif /* NGIF */
2352: #ifndef IPNOPRIVPORTS
1.197 atatat 2353: sysctl_createv(clog, 0, NULL, NULL,
2354: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2355: CTLTYPE_INT, "lowportmin",
2356: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2357: "to assign"),
1.189 atatat 2358: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2359: CTL_NET, PF_INET, IPPROTO_IP,
2360: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2361: sysctl_createv(clog, 0, NULL, NULL,
2362: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2363: CTLTYPE_INT, "lowportmax",
2364: SYSCTL_DESCR("Highest privileged ephemeral port number "
2365: "to assign"),
1.189 atatat 2366: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2367: CTL_NET, PF_INET, IPPROTO_IP,
2368: IPCTL_LOWPORTMAX, CTL_EOL);
2369: #endif /* IPNOPRIVPORTS */
1.197 atatat 2370: sysctl_createv(clog, 0, NULL, NULL,
2371: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2372: CTLTYPE_INT, "maxfragpackets",
2373: SYSCTL_DESCR("Maximum number of fragments to retain for "
2374: "possible reassembly"),
1.189 atatat 2375: NULL, 0, &ip_maxfragpackets, 0,
2376: CTL_NET, PF_INET, IPPROTO_IP,
2377: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2378: #if NGRE > 0
1.197 atatat 2379: sysctl_createv(clog, 0, NULL, NULL,
2380: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2381: CTLTYPE_INT, "grettl",
2382: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2383: NULL, 0, &ip_gre_ttl, 0,
2384: CTL_NET, PF_INET, IPPROTO_IP,
2385: IPCTL_GRE_TTL, CTL_EOL);
2386: #endif /* NGRE */
1.197 atatat 2387: sysctl_createv(clog, 0, NULL, NULL,
2388: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2389: CTLTYPE_INT, "checkinterface",
2390: SYSCTL_DESCR("Enable receive side of Strong ES model "
2391: "from RFC1122"),
1.189 atatat 2392: NULL, 0, &ip_checkinterface, 0,
2393: CTL_NET, PF_INET, IPPROTO_IP,
2394: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2395: sysctl_createv(clog, 0, NULL, NULL,
2396: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2397: CTLTYPE_INT, "random_id",
2398: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2399: NULL, 0, &ip_do_randomid, 0,
2400: CTL_NET, PF_INET, IPPROTO_IP,
2401: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2402: sysctl_createv(clog, 0, NULL, NULL,
2403: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2404: CTLTYPE_INT, "do_loopback_cksum",
2405: SYSCTL_DESCR("Perform IP checksum on loopback"),
2406: NULL, 0, &ip_do_loopback_cksum, 0,
2407: CTL_NET, PF_INET, IPPROTO_IP,
2408: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2409: sysctl_createv(clog, 0, NULL, NULL,
2410: CTLFLAG_PERMANENT,
2411: CTLTYPE_STRUCT, "stats",
2412: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 2413: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 2414: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2415: CTL_EOL);
1.1 cgd 2416: }
1.266 thorpej 2417:
2418: void
2419: ip_statinc(u_int stat)
2420: {
2421:
2422: KASSERT(stat < IP_NSTATS);
2423: IP_STATINC(stat);
2424: }
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