Annotation of src/sys/netinet/ip_input.c, Revision 1.258
1.258 ! matt 1: /* $NetBSD: ip_input.c,v 1.257 2007/12/20 19:53:32 dyoung 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>
1.258 ! matt 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.257 2007/12/20 19:53:32 dyoung 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>
138: #include <netinet/ip_icmp.h>
1.89 itojun 139: /* just for gif_ttl */
140: #include <netinet/in_gif.h>
141: #include "gif.h"
1.144 martin 142: #include <net/if_gre.h>
143: #include "gre.h"
1.111 jdolecek 144:
145: #ifdef MROUTING
146: #include <netinet/ip_mroute.h>
147: #endif
1.89 itojun 148:
149: #ifdef IPSEC
150: #include <netinet6/ipsec.h>
151: #include <netkey/key.h>
152: #endif
1.173 jonathan 153: #ifdef FAST_IPSEC
154: #include <netipsec/ipsec.h>
155: #include <netipsec/key.h>
156: #endif /* FAST_IPSEC*/
1.44 thorpej 157:
1.1 cgd 158: #ifndef IPFORWARDING
159: #ifdef GATEWAY
160: #define IPFORWARDING 1 /* forward IP packets not for us */
161: #else /* GATEWAY */
162: #define IPFORWARDING 0 /* don't forward IP packets not for us */
163: #endif /* GATEWAY */
164: #endif /* IPFORWARDING */
165: #ifndef IPSENDREDIRECTS
166: #define IPSENDREDIRECTS 1
167: #endif
1.26 thorpej 168: #ifndef IPFORWSRCRT
1.47 cjs 169: #define IPFORWSRCRT 1 /* forward source-routed packets */
170: #endif
171: #ifndef IPALLOWSRCRT
1.48 mrg 172: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 173: #endif
1.53 kml 174: #ifndef IPMTUDISC
1.153 itojun 175: #define IPMTUDISC 1
1.53 kml 176: #endif
1.60 kml 177: #ifndef IPMTUDISCTIMEOUT
1.61 kml 178: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 179: #endif
1.53 kml 180:
1.27 thorpej 181: /*
182: * Note: DIRECTED_BROADCAST is handled this way so that previous
183: * configuration using this option will Just Work.
184: */
185: #ifndef IPDIRECTEDBCAST
186: #ifdef DIRECTED_BROADCAST
187: #define IPDIRECTEDBCAST 1
188: #else
189: #define IPDIRECTEDBCAST 0
190: #endif /* DIRECTED_BROADCAST */
191: #endif /* IPDIRECTEDBCAST */
1.1 cgd 192: int ipforwarding = IPFORWARDING;
193: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 194: int ip_defttl = IPDEFTTL;
1.26 thorpej 195: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 196: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 197: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 198: int ip_mtudisc = IPMTUDISC;
1.156 itojun 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 200: #ifdef DIAGNOSTIC
201: int ipprintfs = 0;
202: #endif
1.184 jonathan 203:
204: int ip_do_randomid = 0;
205:
1.165 christos 206: /*
207: * XXX - Setting ip_checkinterface mostly implements the receive side of
208: * the Strong ES model described in RFC 1122, but since the routing table
209: * and transmit implementation do not implement the Strong ES model,
210: * setting this to 1 results in an odd hybrid.
211: *
212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
213: * to translate the destination address to another local interface.
214: *
215: * XXX - ip_checkinterface must be disabled if you add IP aliases
216: * to the loopback interface instead of the interface where the
217: * packets for those addresses are received.
218: */
219: int ip_checkinterface = 0;
220:
1.1 cgd 221:
1.60 kml 222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
223:
1.1 cgd 224: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 225: u_long in_ifaddrhash; /* size of hash table - 1 */
226: int in_ifaddrentries; /* total number of addrs */
1.212 perry 227: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 228: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 229: u_long in_multihash; /* size of hash table - 1 */
230: int in_multientries; /* total number of addrs */
231: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 232: struct ifqueue ipintrq;
1.63 matt 233: struct ipstat ipstat;
1.183 jonathan 234: uint16_t ip_id;
1.75 thorpej 235:
1.121 thorpej 236: #ifdef PFIL_HOOKS
237: struct pfil_head inet_pfil_hook;
238: #endif
239:
1.194 jonathan 240: /*
241: * Cached copy of nmbclusters. If nbclusters is different,
242: * recalculate IP parameters derived from nmbclusters.
243: */
244: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 245: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 246:
1.195 thorpej 247: #define CHECK_NMBCLUSTER_PARAMS() \
248: do { \
249: if (__predict_false(ip_nmbclusters != nmbclusters)) \
250: ip_nmbclusters_changed(); \
251: } while (/*CONSTCOND*/0)
1.194 jonathan 252:
1.190 jonathan 253: /* IP datagram reassembly queues (hashed) */
254: #define IPREASS_NHASH_LOG2 6
255: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
256: #define IPREASS_HMASK (IPREASS_NHASH - 1)
257: #define IPREASS_HASH(x,y) \
258: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
259: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 260: int ipq_locked;
1.212 perry 261: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 262: static int ip_nfrags; /* total fragments in reass queues */
263:
264: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
265: int ip_maxfrags; /* limit on fragments. XXX sysctl */
266:
267:
268: /*
269: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
270: * IP reassembly queue buffer managment.
1.212 perry 271: *
1.194 jonathan 272: * We keep a count of total IP fragments (NB: not fragmented packets!)
273: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
274: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
275: * total fragments in reassembly queues.This AIMD policy avoids
276: * repeatedly deleting single packets under heavy fragmentation load
277: * (e.g., from lossy NFS peers).
278: */
1.212 perry 279: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 280: static void ip_reass_drophalf(void);
1.194 jonathan 281:
1.75 thorpej 282:
1.223 perry 283: static inline int ipq_lock_try(void);
284: static inline void ipq_unlock(void);
1.75 thorpej 285:
1.223 perry 286: static inline int
1.211 perry 287: ipq_lock_try(void)
1.75 thorpej 288: {
289: int s;
290:
1.132 thorpej 291: /*
1.149 wiz 292: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 293: * mbuf allocation.
294: */
295: s = splvm();
1.75 thorpej 296: if (ipq_locked) {
297: splx(s);
298: return (0);
299: }
300: ipq_locked = 1;
301: splx(s);
302: return (1);
303: }
304:
1.223 perry 305: static inline void
1.211 perry 306: ipq_unlock(void)
1.75 thorpej 307: {
308: int s;
309:
1.132 thorpej 310: s = splvm();
1.75 thorpej 311: ipq_locked = 0;
312: splx(s);
313: }
314:
315: #ifdef DIAGNOSTIC
316: #define IPQ_LOCK() \
317: do { \
318: if (ipq_lock_try() == 0) { \
319: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
320: panic("ipq_lock"); \
321: } \
1.159 perry 322: } while (/*CONSTCOND*/ 0)
1.75 thorpej 323: #define IPQ_LOCK_CHECK() \
324: do { \
325: if (ipq_locked == 0) { \
326: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
327: panic("ipq lock check"); \
328: } \
1.159 perry 329: } while (/*CONSTCOND*/ 0)
1.75 thorpej 330: #else
331: #define IPQ_LOCK() (void) ipq_lock_try()
332: #define IPQ_LOCK_CHECK() /* nothing */
333: #endif
334:
335: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 336:
1.246 ad 337: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
338: IPL_SOFTNET);
339: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
340: IPL_VM);
1.72 thorpej 341:
1.135 thorpej 342: #ifdef INET_CSUM_COUNTERS
343: #include <sys/device.h>
344:
345: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
346: NULL, "inet", "hwcsum bad");
347: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
348: NULL, "inet", "hwcsum ok");
349: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
350: NULL, "inet", "swcsum");
351:
352: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
353:
1.201 matt 354: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
355: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
356: EVCNT_ATTACH_STATIC(ip_swcsum);
357:
1.135 thorpej 358: #else
359:
360: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
361:
362: #endif /* INET_CSUM_COUNTERS */
363:
1.1 cgd 364: /*
365: * We need to save the IP options in case a protocol wants to respond
366: * to an incoming packet over the same route if the packet got here
367: * using IP source routing. This allows connection establishment and
368: * maintenance when the remote end is on a network that is not known
369: * to us.
370: */
371: int ip_nhops = 0;
372: static struct ip_srcrt {
373: struct in_addr dst; /* final destination */
374: char nop; /* one NOP to align */
375: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
376: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
377: } ip_srcrt;
378:
1.210 perry 379: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 380:
1.164 matt 381: #ifdef MBUFTRACE
1.234 dogcow 382: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
383: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 384: #endif
385:
1.1 cgd 386: /*
1.194 jonathan 387: * Compute IP limits derived from the value of nmbclusters.
388: */
389: static void
390: ip_nmbclusters_changed(void)
391: {
392: ip_maxfrags = nmbclusters / 4;
393: ip_nmbclusters = nmbclusters;
394: }
395:
396: /*
1.1 cgd 397: * IP initialization: fill in IP protocol switch table.
398: * All protocols not implemented in kernel go to raw IP protocol handler.
399: */
1.8 mycroft 400: void
1.211 perry 401: ip_init(void)
1.1 cgd 402: {
1.199 matt 403: const struct protosw *pr;
1.109 augustss 404: int i;
1.1 cgd 405:
406: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
407: if (pr == 0)
408: panic("ip_init");
409: for (i = 0; i < IPPROTO_MAX; i++)
410: ip_protox[i] = pr - inetsw;
411: for (pr = inetdomain.dom_protosw;
412: pr < inetdomain.dom_protoswNPROTOSW; pr++)
413: if (pr->pr_domain->dom_family == PF_INET &&
414: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
415: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 416:
1.190 jonathan 417: for (i = 0; i < IPREASS_NHASH; i++)
418: LIST_INIT(&ipq[i]);
419:
1.227 kardel 420: ip_id = time_second & 0xfffff;
1.194 jonathan 421:
1.1 cgd 422: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 423: ip_nmbclusters_changed();
424:
1.181 jonathan 425: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 426: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
427: M_WAITOK, &in_ifaddrhash);
1.166 matt 428: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
429: M_WAITOK, &in_multihash);
1.160 itojun 430: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 431: #ifdef GATEWAY
1.248 liamjfoy 432: ipflow_init(ip_hashsize);
1.73 thorpej 433: #endif
1.121 thorpej 434:
435: #ifdef PFIL_HOOKS
436: /* Register our Packet Filter hook. */
1.126 thorpej 437: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
438: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 439: i = pfil_head_register(&inet_pfil_hook);
440: if (i != 0)
441: printf("ip_init: WARNING: unable to register pfil hook, "
442: "error %d\n", i);
443: #endif /* PFIL_HOOKS */
1.135 thorpej 444:
1.164 matt 445: #ifdef MBUFTRACE
446: MOWNER_ATTACH(&ip_tx_mowner);
447: MOWNER_ATTACH(&ip_rx_mowner);
448: #endif /* MBUFTRACE */
1.1 cgd 449: }
450:
1.229 christos 451: struct sockaddr_in ipaddr = {
452: .sin_len = sizeof(ipaddr),
453: .sin_family = AF_INET,
454: };
1.1 cgd 455: struct route ipforward_rt;
456:
457: /*
1.89 itojun 458: * IP software interrupt routine
459: */
460: void
1.211 perry 461: ipintr(void)
1.89 itojun 462: {
463: int s;
464: struct mbuf *m;
465:
1.241 ad 466: while (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 467: s = splnet();
1.89 itojun 468: IF_DEQUEUE(&ipintrq, m);
469: splx(s);
470: if (m == 0)
471: return;
472: ip_input(m);
473: }
474: }
475:
476: /*
1.1 cgd 477: * Ip input routine. Checksum and byte swap header. If fragmented
478: * try to reassemble. Process options. Pass to next level.
479: */
1.8 mycroft 480: void
1.89 itojun 481: ip_input(struct mbuf *m)
1.1 cgd 482: {
1.109 augustss 483: struct ip *ip = NULL;
484: struct ipq *fp;
485: struct in_ifaddr *ia;
486: struct ifaddr *ifa;
1.25 cgd 487: struct ipqent *ipqe;
1.89 itojun 488: int hlen = 0, mff, len;
1.100 itojun 489: int downmatch;
1.165 christos 490: int checkif;
1.169 itojun 491: int srcrt = 0;
1.233 tls 492: int s;
1.190 jonathan 493: u_int hash;
1.173 jonathan 494: #ifdef FAST_IPSEC
495: struct m_tag *mtag;
496: struct tdb_ident *tdbi;
497: struct secpolicy *sp;
1.233 tls 498: int error;
1.173 jonathan 499: #endif /* FAST_IPSEC */
1.1 cgd 500:
1.164 matt 501: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 502: #ifdef DIAGNOSTIC
503: if ((m->m_flags & M_PKTHDR) == 0)
504: panic("ipintr no HDR");
1.89 itojun 505: #endif
1.164 matt 506:
1.1 cgd 507: /*
508: * If no IP addresses have been set yet but the interfaces
509: * are receiving, can't do anything with incoming packets yet.
510: */
1.181 jonathan 511: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 512: goto bad;
513: ipstat.ips_total++;
1.154 thorpej 514: /*
515: * If the IP header is not aligned, slurp it up into a new
516: * mbuf with space for link headers, in the event we forward
517: * it. Otherwise, if it is aligned, make sure the entire
518: * base IP header is in the first mbuf of the chain.
519: */
1.244 christos 520: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 521: if ((m = m_copyup(m, sizeof(struct ip),
522: (max_linkhdr + 3) & ~3)) == NULL) {
523: /* XXXJRT new stat, please */
524: ipstat.ips_toosmall++;
525: return;
526: }
527: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
528: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
529: ipstat.ips_toosmall++;
530: return;
531: }
1.1 cgd 532: }
533: ip = mtod(m, struct ip *);
1.13 mycroft 534: if (ip->ip_v != IPVERSION) {
535: ipstat.ips_badvers++;
536: goto bad;
537: }
1.1 cgd 538: hlen = ip->ip_hl << 2;
539: if (hlen < sizeof(struct ip)) { /* minimum header length */
540: ipstat.ips_badhlen++;
541: goto bad;
542: }
543: if (hlen > m->m_len) {
544: if ((m = m_pullup(m, hlen)) == 0) {
545: ipstat.ips_badhlen++;
1.89 itojun 546: return;
1.1 cgd 547: }
548: ip = mtod(m, struct ip *);
549: }
1.98 thorpej 550:
1.85 hwr 551: /*
1.99 thorpej 552: * RFC1122: packets with a multicast source address are
1.98 thorpej 553: * not allowed.
1.85 hwr 554: */
555: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 556: ipstat.ips_badaddr++;
1.85 hwr 557: goto bad;
1.129 itojun 558: }
559:
560: /* 127/8 must not appear on wire - RFC1122 */
561: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
562: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 563: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
564: ipstat.ips_badaddr++;
1.129 itojun 565: goto bad;
1.130 itojun 566: }
1.85 hwr 567: }
568:
1.135 thorpej 569: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 570: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 571: M_CSUM_IPv4_BAD)) {
572: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
573: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
574: goto badcsum;
575:
576: case M_CSUM_IPv4:
577: /* Checksum was okay. */
578: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
579: break;
580:
581: default:
1.206 thorpej 582: /*
583: * Must compute it ourselves. Maybe skip checksum on
584: * loopback interfaces.
585: */
586: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
587: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
588: INET_CSUM_COUNTER_INCR(&ip_swcsum);
589: if (in_cksum(m, hlen) != 0)
590: goto badcsum;
591: }
1.135 thorpej 592: break;
1.1 cgd 593: }
594:
1.121 thorpej 595: /* Retrieve the packet length. */
596: len = ntohs(ip->ip_len);
1.81 proff 597:
598: /*
599: * Check for additional length bogosity
600: */
1.84 proff 601: if (len < hlen) {
1.81 proff 602: ipstat.ips_badlen++;
603: goto bad;
604: }
1.1 cgd 605:
606: /*
607: * Check that the amount of data in the buffers
608: * is as at least much as the IP header would have us expect.
609: * Trim mbufs if longer than we expect.
610: * Drop packet if shorter than we expect.
611: */
1.35 mycroft 612: if (m->m_pkthdr.len < len) {
1.1 cgd 613: ipstat.ips_tooshort++;
614: goto bad;
615: }
1.35 mycroft 616: if (m->m_pkthdr.len > len) {
1.1 cgd 617: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 618: m->m_len = len;
619: m->m_pkthdr.len = len;
1.1 cgd 620: } else
1.35 mycroft 621: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 622: }
623:
1.193 scw 624: #if defined(IPSEC)
1.149 wiz 625: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 626: m->m_flags &= ~M_CANFASTFWD;
627: #else
1.64 thorpej 628: /*
629: * Assume that we can create a fast-forward IP flow entry
630: * based on this packet.
631: */
632: m->m_flags |= M_CANFASTFWD;
1.94 itojun 633: #endif
1.64 thorpej 634:
1.36 mrg 635: #ifdef PFIL_HOOKS
1.33 mrg 636: /*
1.64 thorpej 637: * Run through list of hooks for input packets. If there are any
638: * filters which require that additional packets in the flow are
639: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
640: * Note that filters must _never_ set this flag, as another filter
641: * in the list may have previously cleared it.
1.33 mrg 642: */
1.127 itojun 643: /*
644: * let ipfilter look at packet on the wire,
645: * not the decapsulated packet.
646: */
647: #ifdef IPSEC
1.136 itojun 648: if (!ipsec_getnhist(m))
1.186 scw 649: #elif defined(FAST_IPSEC)
650: if (!ipsec_indone(m))
1.127 itojun 651: #else
652: if (1)
653: #endif
654: {
1.169 itojun 655: struct in_addr odst;
656:
657: odst = ip->ip_dst;
1.127 itojun 658: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 659: PFIL_IN) != 0)
660: return;
1.127 itojun 661: if (m == NULL)
662: return;
663: ip = mtod(m, struct ip *);
1.142 darrenr 664: hlen = ip->ip_hl << 2;
1.205 darrenr 665: /*
666: * XXX The setting of "srcrt" here is to prevent ip_forward()
667: * from generating ICMP redirects for packets that have
668: * been redirected by a hook back out on to the same LAN that
669: * they came from and is not an indication that the packet
670: * is being inffluenced by source routing options. This
671: * allows things like
672: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
673: * where tlp0 is both on the 1.1.1.0/24 network and is the
674: * default route for hosts on 1.1.1.0/24. Of course this
675: * also requires a "map tlp0 ..." to complete the story.
676: * One might argue whether or not this kind of network config.
1.212 perry 677: * should be supported in this manner...
1.205 darrenr 678: */
1.169 itojun 679: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 680: }
1.36 mrg 681: #endif /* PFIL_HOOKS */
1.123 thorpej 682:
683: #ifdef ALTQ
684: /* XXX Temporary until ALTQ is changed to use a pfil hook */
685: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
686: /* packet dropped by traffic conditioner */
687: return;
688: }
689: #endif
1.121 thorpej 690:
691: /*
1.1 cgd 692: * Process options and, if not destined for us,
693: * ship it on. ip_dooptions returns 1 when an
694: * error was detected (causing an icmp message
695: * to be sent and the original packet to be freed).
696: */
697: ip_nhops = 0; /* for source routed packets */
698: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 699: return;
1.1 cgd 700:
701: /*
1.165 christos 702: * Enable a consistency check between the destination address
703: * and the arrival interface for a unicast packet (the RFC 1122
704: * strong ES model) if IP forwarding is disabled and the packet
705: * is not locally generated.
706: *
707: * XXX - Checking also should be disabled if the destination
708: * address is ipnat'ed to a different interface.
709: *
710: * XXX - Checking is incompatible with IP aliases added
711: * to the loopback interface instead of the interface where
712: * the packets are received.
713: *
714: * XXX - We need to add a per ifaddr flag for this so that
715: * we get finer grain control.
716: */
717: checkif = ip_checkinterface && (ipforwarding == 0) &&
718: (m->m_pkthdr.rcvif != NULL) &&
719: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
720:
721: /*
1.1 cgd 722: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 723: *
724: * Traditional 4.4BSD did not consult IFF_UP at all.
725: * The behavior here is to treat addresses on !IFF_UP interface
726: * as not mine.
1.1 cgd 727: */
1.100 itojun 728: downmatch = 0;
1.140 matt 729: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 730: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 731: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
732: continue;
1.97 itojun 733: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
734: break;
1.100 itojun 735: else
736: downmatch++;
1.97 itojun 737: }
738: }
1.86 thorpej 739: if (ia != NULL)
740: goto ours;
1.225 christos 741: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 742: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 743: if (ifa->ifa_addr->sa_family != AF_INET)
744: continue;
1.57 tls 745: ia = ifatoia(ifa);
1.35 mycroft 746: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
747: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 748: /*
749: * Look for all-0's host part (old broadcast addr),
750: * either for subnet or net.
751: */
752: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 753: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 754: goto ours;
1.57 tls 755: /*
756: * An interface with IP address zero accepts
757: * all packets that arrive on that interface.
758: */
759: if (in_nullhost(ia->ia_addr.sin_addr))
760: goto ours;
1.1 cgd 761: }
762: }
1.18 mycroft 763: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 764: struct in_multi *inm;
765: #ifdef MROUTING
766: extern struct socket *ip_mrouter;
1.10 brezak 767:
1.4 hpeyerl 768: if (ip_mrouter) {
769: /*
770: * If we are acting as a multicast router, all
771: * incoming multicast packets are passed to the
772: * kernel-level multicast forwarding function.
773: * The packet is returned (relatively) intact; if
774: * ip_mforward() returns a non-zero value, the packet
775: * must be discarded, else it may be accepted below.
776: *
777: * (The IP ident field is put in the same byte order
778: * as expected when ip_mforward() is called from
779: * ip_output().)
780: */
1.13 mycroft 781: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
782: ipstat.ips_cantforward++;
1.4 hpeyerl 783: m_freem(m);
1.89 itojun 784: return;
1.4 hpeyerl 785: }
786:
787: /*
788: * The process-level routing demon needs to receive
789: * all multicast IGMP packets, whether or not this
790: * host belongs to their destination groups.
791: */
792: if (ip->ip_p == IPPROTO_IGMP)
793: goto ours;
1.13 mycroft 794: ipstat.ips_forward++;
1.4 hpeyerl 795: }
796: #endif
797: /*
798: * See if we belong to the destination multicast group on the
799: * arrival interface.
800: */
801: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
802: if (inm == NULL) {
1.13 mycroft 803: ipstat.ips_cantforward++;
1.4 hpeyerl 804: m_freem(m);
1.89 itojun 805: return;
1.4 hpeyerl 806: }
807: goto ours;
808: }
1.19 mycroft 809: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 810: in_nullhost(ip->ip_dst))
1.1 cgd 811: goto ours;
812:
813: /*
814: * Not for us; forward if possible and desirable.
815: */
816: if (ipforwarding == 0) {
817: ipstat.ips_cantforward++;
818: m_freem(m);
1.100 itojun 819: } else {
820: /*
821: * If ip_dst matched any of my address on !IFF_UP interface,
822: * and there's no IFF_UP interface that matches ip_dst,
823: * send icmp unreach. Forwarding it will result in in-kernel
824: * forwarding loop till TTL goes to 0.
825: */
826: if (downmatch) {
827: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
828: ipstat.ips_cantforward++;
829: return;
830: }
1.145 itojun 831: #ifdef IPSEC
832: if (ipsec4_in_reject(m, NULL)) {
833: ipsecstat.in_polvio++;
834: goto bad;
835: }
836: #endif
1.173 jonathan 837: #ifdef FAST_IPSEC
838: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
839: s = splsoftnet();
840: if (mtag != NULL) {
841: tdbi = (struct tdb_ident *)(mtag + 1);
842: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
843: } else {
844: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 845: IP_FORWARDING, &error);
1.173 jonathan 846: }
847: if (sp == NULL) { /* NB: can happen if error */
848: splx(s);
849: /*XXX error stat???*/
850: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
851: goto bad;
852: }
853:
854: /*
855: * Check security policy against packet attributes.
856: */
857: error = ipsec_in_reject(sp, m);
858: KEY_FREESP(&sp);
859: splx(s);
860: if (error) {
861: ipstat.ips_cantforward++;
862: goto bad;
1.193 scw 863: }
864:
865: /*
866: * Peek at the outbound SP for this packet to determine if
867: * it's a Fast Forward candidate.
868: */
869: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
870: if (mtag != NULL)
871: m->m_flags &= ~M_CANFASTFWD;
872: else {
873: s = splsoftnet();
874: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
875: (IP_FORWARDING |
876: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
877: &error, NULL);
878: if (sp != NULL) {
879: m->m_flags &= ~M_CANFASTFWD;
880: KEY_FREESP(&sp);
881: }
882: splx(s);
1.173 jonathan 883: }
884: #endif /* FAST_IPSEC */
1.145 itojun 885:
1.169 itojun 886: ip_forward(m, srcrt);
1.100 itojun 887: }
1.89 itojun 888: return;
1.1 cgd 889:
890: ours:
891: /*
892: * If offset or IP_MF are set, must reassemble.
893: * Otherwise, nothing need be done.
894: * (We could look in the reassembly queue to see
895: * if the packet was previously fragmented,
896: * but it's not worth the time; just let them time out.)
897: */
1.155 itojun 898: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258 ! matt 899: uint16_t off;
! 900: /*
! 901: * Prevent TCP blind data attacks by not allowing non-initial
! 902: * fragments to start at less than 68 bytes (minimal fragment
! 903: * size).
! 904: */
! 905: off = htons(ip->ip_off) & ~(IP_DF|IP_EF|IP_MF);
! 906: if (off > 0 && off + hlen < IP_MINFRAGSIZE - 1) {
! 907: ipstat.ips_badfrags++;
! 908: goto bad;
! 909: }
1.1 cgd 910: /*
911: * Look for queue of fragments
912: * of this datagram.
913: */
1.75 thorpej 914: IPQ_LOCK();
1.190 jonathan 915: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250 dyoung 916: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1 cgd 917: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 918: in_hosteq(ip->ip_src, fp->ipq_src) &&
919: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 920: ip->ip_p == fp->ipq_p)
921: goto found;
1.190 jonathan 922:
923: }
1.1 cgd 924: fp = 0;
925: found:
926:
927: /*
928: * Adjust ip_len to not reflect header,
1.25 cgd 929: * set ipqe_mff if more fragments are expected,
1.1 cgd 930: * convert offset of this to bytes.
931: */
1.155 itojun 932: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
933: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 934: if (mff) {
1.16 cgd 935: /*
936: * Make sure that fragments have a data length
937: * that's a non-zero multiple of 8 bytes.
938: */
1.155 itojun 939: if (ntohs(ip->ip_len) == 0 ||
940: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 941: ipstat.ips_badfrags++;
1.75 thorpej 942: IPQ_UNLOCK();
1.16 cgd 943: goto bad;
944: }
945: }
1.155 itojun 946: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 947:
948: /*
949: * If datagram marked as having more fragments
950: * or if this is not the first fragment,
951: * attempt reassembly; if it succeeds, proceed.
952: */
1.155 itojun 953: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 954: ipstat.ips_fragments++;
1.233 tls 955: s = splvm();
1.72 thorpej 956: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 957: splx(s);
1.25 cgd 958: if (ipqe == NULL) {
959: ipstat.ips_rcvmemdrop++;
1.75 thorpej 960: IPQ_UNLOCK();
1.25 cgd 961: goto bad;
962: }
963: ipqe->ipqe_mff = mff;
1.50 thorpej 964: ipqe->ipqe_m = m;
1.25 cgd 965: ipqe->ipqe_ip = ip;
1.190 jonathan 966: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 967: if (m == 0) {
968: IPQ_UNLOCK();
1.89 itojun 969: return;
1.75 thorpej 970: }
1.13 mycroft 971: ipstat.ips_reassembled++;
1.50 thorpej 972: ip = mtod(m, struct ip *);
1.74 thorpej 973: hlen = ip->ip_hl << 2;
1.155 itojun 974: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 975: } else
976: if (fp)
977: ip_freef(fp);
1.75 thorpej 978: IPQ_UNLOCK();
1.79 mycroft 979: }
1.128 itojun 980:
1.173 jonathan 981: #if defined(IPSEC)
1.128 itojun 982: /*
983: * enforce IPsec policy checking if we are seeing last header.
984: * note that we do not visit this with protocols with pcb layer
985: * code - like udp/tcp/raw ip.
986: */
987: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
988: ipsec4_in_reject(m, NULL)) {
989: ipsecstat.in_polvio++;
990: goto bad;
991: }
992: #endif
1.226 liamjfoy 993: #ifdef FAST_IPSEC
1.173 jonathan 994: /*
995: * enforce IPsec policy checking if we are seeing last header.
996: * note that we do not visit this with protocols with pcb layer
997: * code - like udp/tcp/raw ip.
998: */
999: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1000: /*
1001: * Check if the packet has already had IPsec processing
1002: * done. If so, then just pass it along. This tag gets
1003: * set during AH, ESP, etc. input handling, before the
1004: * packet is returned to the ip input queue for delivery.
1.212 perry 1005: */
1.173 jonathan 1006: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1007: s = splsoftnet();
1008: if (mtag != NULL) {
1009: tdbi = (struct tdb_ident *)(mtag + 1);
1010: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1011: } else {
1012: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1013: IP_FORWARDING, &error);
1.173 jonathan 1014: }
1015: if (sp != NULL) {
1016: /*
1017: * Check security policy against packet attributes.
1018: */
1019: error = ipsec_in_reject(sp, m);
1020: KEY_FREESP(&sp);
1021: } else {
1022: /* XXX error stat??? */
1023: error = EINVAL;
1024: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1025: }
1026: splx(s);
1027: if (error)
1028: goto bad;
1029: }
1030: #endif /* FAST_IPSEC */
1.1 cgd 1031:
1032: /*
1033: * Switch out to protocol's input routine.
1034: */
1.82 aidan 1035: #if IFA_STATS
1.122 itojun 1036: if (ia && ip)
1.155 itojun 1037: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1038: #endif
1.1 cgd 1039: ipstat.ips_delivered++;
1.89 itojun 1040: {
1041: int off = hlen, nh = ip->ip_p;
1042:
1043: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1044: return;
1045: }
1.1 cgd 1046: bad:
1047: m_freem(m);
1.135 thorpej 1048: return;
1049:
1050: badcsum:
1051: ipstat.ips_badsum++;
1052: m_freem(m);
1.1 cgd 1053: }
1054:
1055: /*
1056: * Take incoming datagram fragment and try to
1057: * reassemble it into whole datagram. If a chain for
1058: * reassembly of this datagram already exists, then it
1059: * is given as fp; otherwise have to make a chain.
1060: */
1.50 thorpej 1061: struct mbuf *
1.211 perry 1062: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1063: {
1.109 augustss 1064: struct mbuf *m = ipqe->ipqe_m;
1065: struct ipqent *nq, *p, *q;
1.25 cgd 1066: struct ip *ip;
1.1 cgd 1067: struct mbuf *t;
1.25 cgd 1068: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1069: int i, next, s;
1.1 cgd 1070:
1.75 thorpej 1071: IPQ_LOCK_CHECK();
1072:
1.1 cgd 1073: /*
1074: * Presence of header sizes in mbufs
1075: * would confuse code below.
1076: */
1077: m->m_data += hlen;
1078: m->m_len -= hlen;
1079:
1.194 jonathan 1080: #ifdef notyet
1081: /* make sure fragment limit is up-to-date */
1082: CHECK_NMBCLUSTER_PARAMS();
1083:
1084: /* If we have too many fragments, drop the older half. */
1085: if (ip_nfrags >= ip_maxfrags)
1086: ip_reass_drophalf(void);
1087: #endif
1088:
1.1 cgd 1089: /*
1.192 jonathan 1090: * We are about to add a fragment; increment frag count.
1091: */
1092: ip_nfrags++;
1.212 perry 1093:
1.192 jonathan 1094: /*
1.1 cgd 1095: * If first fragment to arrive, create a reassembly queue.
1096: */
1097: if (fp == 0) {
1.131 itojun 1098: /*
1099: * Enforce upper bound on number of fragmented packets
1100: * for which we attempt reassembly;
1101: * If maxfrag is 0, never accept fragments.
1102: * If maxfrag is -1, accept all fragments without limitation.
1103: */
1104: if (ip_maxfragpackets < 0)
1105: ;
1106: else if (ip_nfragpackets >= ip_maxfragpackets)
1107: goto dropfrag;
1108: ip_nfragpackets++;
1.50 thorpej 1109: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1110: M_FTABLE, M_NOWAIT);
1111: if (fp == NULL)
1.1 cgd 1112: goto dropfrag;
1.190 jonathan 1113: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1114: fp->ipq_nfrags = 1;
1.1 cgd 1115: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1116: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1117: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1118: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1119: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1120: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1121: p = NULL;
1.1 cgd 1122: goto insert;
1.192 jonathan 1123: } else {
1124: fp->ipq_nfrags++;
1.1 cgd 1125: }
1126:
1127: /*
1128: * Find a segment which begins after this one does.
1129: */
1.148 matt 1130: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1131: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1132: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1133: break;
1134:
1135: /*
1136: * If there is a preceding segment, it may provide some of
1137: * our data already. If so, drop the data from the incoming
1138: * segment. If it provides all of our data, drop us.
1139: */
1.25 cgd 1140: if (p != NULL) {
1.155 itojun 1141: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1142: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1143: if (i > 0) {
1.155 itojun 1144: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1145: goto dropfrag;
1.50 thorpej 1146: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1147: ipqe->ipqe_ip->ip_off =
1148: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1149: ipqe->ipqe_ip->ip_len =
1150: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1151: }
1152: }
1153:
1154: /*
1155: * While we overlap succeeding segments trim them or,
1156: * if they are completely covered, dequeue them.
1157: */
1.155 itojun 1158: for (; q != NULL &&
1159: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1160: ntohs(q->ipqe_ip->ip_off); q = nq) {
1161: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1162: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1163: if (i < ntohs(q->ipqe_ip->ip_len)) {
1164: q->ipqe_ip->ip_len =
1165: htons(ntohs(q->ipqe_ip->ip_len) - i);
1166: q->ipqe_ip->ip_off =
1167: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1168: m_adj(q->ipqe_m, i);
1.1 cgd 1169: break;
1170: }
1.148 matt 1171: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1172: m_freem(q->ipqe_m);
1.148 matt 1173: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1174: s = splvm();
1.72 thorpej 1175: pool_put(&ipqent_pool, q);
1.233 tls 1176: splx(s);
1.192 jonathan 1177: fp->ipq_nfrags--;
1178: ip_nfrags--;
1.1 cgd 1179: }
1180:
1181: insert:
1182: /*
1183: * Stick new segment in its place;
1184: * check for complete reassembly.
1185: */
1.25 cgd 1186: if (p == NULL) {
1.148 matt 1187: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1188: } else {
1.148 matt 1189: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1190: }
1.1 cgd 1191: next = 0;
1.148 matt 1192: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1193: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1194: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1195: return (0);
1.155 itojun 1196: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1197: }
1.25 cgd 1198: if (p->ipqe_mff)
1.1 cgd 1199: return (0);
1200:
1201: /*
1.41 thorpej 1202: * Reassembly is complete. Check for a bogus message size and
1203: * concatenate fragments.
1.1 cgd 1204: */
1.148 matt 1205: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1206: ip = q->ipqe_ip;
1.41 thorpej 1207: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1208: ipstat.ips_toolong++;
1209: ip_freef(fp);
1210: return (0);
1211: }
1.50 thorpej 1212: m = q->ipqe_m;
1.1 cgd 1213: t = m->m_next;
1214: m->m_next = 0;
1215: m_cat(m, t);
1.148 matt 1216: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1217: s = splvm();
1.72 thorpej 1218: pool_put(&ipqent_pool, q);
1.233 tls 1219: splx(s);
1.25 cgd 1220: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1221: t = q->ipqe_m;
1.148 matt 1222: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1223: s = splvm();
1.72 thorpej 1224: pool_put(&ipqent_pool, q);
1.233 tls 1225: splx(s);
1.1 cgd 1226: m_cat(m, t);
1227: }
1.192 jonathan 1228: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1229:
1230: /*
1231: * Create header for new ip packet by
1232: * modifying header of first packet;
1233: * dequeue and discard fragment reassembly header.
1234: * Make header visible.
1235: */
1.155 itojun 1236: ip->ip_len = htons(next);
1.25 cgd 1237: ip->ip_src = fp->ipq_src;
1238: ip->ip_dst = fp->ipq_dst;
1239: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1240: FREE(fp, M_FTABLE);
1.131 itojun 1241: ip_nfragpackets--;
1.1 cgd 1242: m->m_len += (ip->ip_hl << 2);
1243: m->m_data -= (ip->ip_hl << 2);
1244: /* some debugging cruft by sklower, below, will go away soon */
1245: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1246: int plen = 0;
1.50 thorpej 1247: for (t = m; t; t = t->m_next)
1248: plen += t->m_len;
1249: m->m_pkthdr.len = plen;
1.213 yamt 1250: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1251: }
1.50 thorpej 1252: return (m);
1.1 cgd 1253:
1254: dropfrag:
1.192 jonathan 1255: if (fp != 0)
1256: fp->ipq_nfrags--;
1257: ip_nfrags--;
1.1 cgd 1258: ipstat.ips_fragdropped++;
1259: m_freem(m);
1.233 tls 1260: s = splvm();
1.72 thorpej 1261: pool_put(&ipqent_pool, ipqe);
1.233 tls 1262: splx(s);
1.1 cgd 1263: return (0);
1264: }
1265:
1266: /*
1267: * Free a fragment reassembly header and all
1268: * associated datagrams.
1269: */
1.8 mycroft 1270: void
1.211 perry 1271: ip_freef(struct ipq *fp)
1.1 cgd 1272: {
1.109 augustss 1273: struct ipqent *q, *p;
1.192 jonathan 1274: u_int nfrags = 0;
1.233 tls 1275: int s;
1.1 cgd 1276:
1.75 thorpej 1277: IPQ_LOCK_CHECK();
1278:
1.148 matt 1279: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1280: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1281: m_freem(q->ipqe_m);
1.192 jonathan 1282: nfrags++;
1.148 matt 1283: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1284: s = splvm();
1.72 thorpej 1285: pool_put(&ipqent_pool, q);
1.233 tls 1286: splx(s);
1.1 cgd 1287: }
1.192 jonathan 1288:
1289: if (nfrags != fp->ipq_nfrags)
1290: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1291: ip_nfrags -= nfrags;
1.25 cgd 1292: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1293: FREE(fp, M_FTABLE);
1.131 itojun 1294: ip_nfragpackets--;
1.1 cgd 1295: }
1296:
1297: /*
1.194 jonathan 1298: * IP reassembly TTL machinery for multiplicative drop.
1299: */
1300: static u_int fragttl_histo[(IPFRAGTTL+1)];
1301:
1302:
1303: /*
1304: * Decrement TTL of all reasembly queue entries by `ticks'.
1305: * Count number of distinct fragments (as opposed to partial, fragmented
1306: * datagrams) in the reassembly queue. While we traverse the entire
1307: * reassembly queue, compute and return the median TTL over all fragments.
1308: */
1309: static u_int
1310: ip_reass_ttl_decr(u_int ticks)
1311: {
1.198 matt 1312: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1313: struct ipq *fp, *nfp;
1.198 matt 1314: int i;
1.212 perry 1315:
1.194 jonathan 1316: nfrags = 0;
1317: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1318:
1.194 jonathan 1319: for (i = 0; i < IPREASS_NHASH; i++) {
1320: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1321: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1322: 0 : fp->ipq_ttl - ticks);
1323: nfp = LIST_NEXT(fp, ipq_q);
1324: if (fp->ipq_ttl == 0) {
1325: ipstat.ips_fragtimeout++;
1326: ip_freef(fp);
1327: } else {
1328: nfrags += fp->ipq_nfrags;
1329: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1330: }
1331: }
1332: }
1333:
1334: KASSERT(ip_nfrags == nfrags);
1335:
1336: /* Find median (or other drop fraction) in histogram. */
1337: dropfraction = (ip_nfrags / 2);
1338: keepfraction = ip_nfrags - dropfraction;
1339: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1340: median += fragttl_histo[i];
1341: if (median >= keepfraction)
1342: break;
1343: }
1344:
1345: /* Return TTL of median (or other fraction). */
1346: return (u_int)i;
1347: }
1348:
1349: void
1350: ip_reass_drophalf(void)
1351: {
1352:
1353: u_int median_ticks;
1354: /*
1355: * Compute median TTL of all fragments, and count frags
1356: * with that TTL or lower (roughly half of all fragments).
1357: */
1358: median_ticks = ip_reass_ttl_decr(0);
1359:
1360: /* Drop half. */
1361: median_ticks = ip_reass_ttl_decr(median_ticks);
1362:
1363: }
1364:
1365: /*
1.1 cgd 1366: * IP timer processing;
1367: * if a timer expires on a reassembly
1368: * queue, discard it.
1369: */
1.8 mycroft 1370: void
1.211 perry 1371: ip_slowtimo(void)
1.1 cgd 1372: {
1.191 jonathan 1373: static u_int dropscanidx = 0;
1374: u_int i;
1.194 jonathan 1375: u_int median_ttl;
1.24 mycroft 1376: int s = splsoftnet();
1.1 cgd 1377:
1.75 thorpej 1378: IPQ_LOCK();
1.194 jonathan 1379:
1380: /* Age TTL of all fragments by 1 tick .*/
1381: median_ttl = ip_reass_ttl_decr(1);
1382:
1383: /* make sure fragment limit is up-to-date */
1384: CHECK_NMBCLUSTER_PARAMS();
1385:
1386: /* If we have too many fragments, drop the older half. */
1387: if (ip_nfrags > ip_maxfrags)
1388: ip_reass_ttl_decr(median_ttl);
1389:
1.131 itojun 1390: /*
1.194 jonathan 1391: * If we are over the maximum number of fragmented packets
1.131 itojun 1392: * (due to the limit being lowered), drain off
1.190 jonathan 1393: * enough to get down to the new limit. Start draining
1394: * from the reassembly hashqueue most recently drained.
1.131 itojun 1395: */
1396: if (ip_maxfragpackets < 0)
1397: ;
1398: else {
1.190 jonathan 1399: int wrapped = 0;
1400:
1401: i = dropscanidx;
1402: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1403: while (LIST_FIRST(&ipq[i]) != NULL)
1404: ip_freef(LIST_FIRST(&ipq[i]));
1405: if (++i >= IPREASS_NHASH) {
1406: i = 0;
1407: }
1408: /*
1409: * Dont scan forever even if fragment counters are
1410: * wrong: stop after scanning entire reassembly queue.
1411: */
1412: if (i == dropscanidx)
1413: wrapped = 1;
1414: }
1415: dropscanidx = i;
1.131 itojun 1416: }
1.75 thorpej 1417: IPQ_UNLOCK();
1.1 cgd 1418: splx(s);
1419: }
1420:
1421: /*
1422: * Drain off all datagram fragments.
1423: */
1.8 mycroft 1424: void
1.211 perry 1425: ip_drain(void)
1.1 cgd 1426: {
1427:
1.75 thorpej 1428: /*
1429: * We may be called from a device's interrupt context. If
1430: * the ipq is already busy, just bail out now.
1431: */
1432: if (ipq_lock_try() == 0)
1433: return;
1434:
1.194 jonathan 1435: /*
1436: * Drop half the total fragments now. If more mbufs are needed,
1437: * we will be called again soon.
1438: */
1439: ip_reass_drophalf();
1.75 thorpej 1440:
1441: IPQ_UNLOCK();
1.1 cgd 1442: }
1443:
1444: /*
1445: * Do option processing on a datagram,
1446: * possibly discarding it if bad options are encountered,
1447: * or forwarding it if source-routed.
1448: * Returns 1 if packet has been forwarded/freed,
1449: * 0 if the packet should be processed further.
1450: */
1.8 mycroft 1451: int
1.211 perry 1452: ip_dooptions(struct mbuf *m)
1.1 cgd 1453: {
1.109 augustss 1454: struct ip *ip = mtod(m, struct ip *);
1455: u_char *cp, *cp0;
1456: struct ip_timestamp *ipt;
1457: struct in_ifaddr *ia;
1.1 cgd 1458: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1459: struct in_addr dst;
1.1 cgd 1460: n_time ntime;
1461:
1.13 mycroft 1462: dst = ip->ip_dst;
1.1 cgd 1463: cp = (u_char *)(ip + 1);
1464: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1465: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1466: opt = cp[IPOPT_OPTVAL];
1467: if (opt == IPOPT_EOL)
1468: break;
1469: if (opt == IPOPT_NOP)
1470: optlen = 1;
1471: else {
1.113 itojun 1472: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1473: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1474: goto bad;
1475: }
1.1 cgd 1476: optlen = cp[IPOPT_OLEN];
1.114 itojun 1477: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1478: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1479: goto bad;
1480: }
1481: }
1482: switch (opt) {
1483:
1484: default:
1485: break;
1486:
1487: /*
1488: * Source routing with record.
1489: * Find interface with current destination address.
1490: * If none on this machine then drop if strictly routed,
1491: * or do nothing if loosely routed.
1492: * Record interface address and bring up next address
1493: * component. If strictly routed make sure next
1494: * address is on directly accessible net.
1495: */
1496: case IPOPT_LSRR:
1497: case IPOPT_SSRR:
1.47 cjs 1498: if (ip_allowsrcrt == 0) {
1499: type = ICMP_UNREACH;
1500: code = ICMP_UNREACH_NET_PROHIB;
1501: goto bad;
1502: }
1.114 itojun 1503: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1504: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1505: goto bad;
1506: }
1.1 cgd 1507: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1508: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1509: goto bad;
1510: }
1511: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1512: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1513: if (ia == 0) {
1514: if (opt == IPOPT_SSRR) {
1515: type = ICMP_UNREACH;
1516: code = ICMP_UNREACH_SRCFAIL;
1517: goto bad;
1518: }
1519: /*
1520: * Loose routing, and not at next destination
1521: * yet; nothing to do except forward.
1522: */
1523: break;
1524: }
1525: off--; /* 0 origin */
1.112 sommerfe 1526: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1527: /*
1528: * End of source route. Should be for us.
1529: */
1530: save_rte(cp, ip->ip_src);
1531: break;
1532: }
1533: /*
1534: * locate outgoing interface
1535: */
1.244 christos 1536: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1 cgd 1537: sizeof(ipaddr.sin_addr));
1.96 thorpej 1538: if (opt == IPOPT_SSRR)
1.196 itojun 1539: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1540: else
1.1 cgd 1541: ia = ip_rtaddr(ipaddr.sin_addr);
1542: if (ia == 0) {
1543: type = ICMP_UNREACH;
1544: code = ICMP_UNREACH_SRCFAIL;
1545: goto bad;
1546: }
1547: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1548: bcopy((void *)&ia->ia_addr.sin_addr,
1549: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1550: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1551: /*
1552: * Let ip_intr's mcast routing check handle mcast pkts
1553: */
1.18 mycroft 1554: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1555: break;
1556:
1557: case IPOPT_RR:
1.114 itojun 1558: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1559: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1560: goto bad;
1561: }
1.1 cgd 1562: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1563: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1564: goto bad;
1565: }
1566: /*
1567: * If no space remains, ignore.
1568: */
1569: off--; /* 0 origin */
1.112 sommerfe 1570: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1571: break;
1.244 christos 1572: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1 cgd 1573: sizeof(ipaddr.sin_addr));
1574: /*
1575: * locate outgoing interface; if we're the destination,
1576: * use the incoming interface (should be same).
1577: */
1.96 thorpej 1578: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1579: == NULL &&
1580: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1581: type = ICMP_UNREACH;
1582: code = ICMP_UNREACH_HOST;
1583: goto bad;
1584: }
1.244 christos 1585: bcopy((void *)&ia->ia_addr.sin_addr,
1586: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1587: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1588: break;
1589:
1590: case IPOPT_TS:
1591: code = cp - (u_char *)ip;
1592: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1593: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1594: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1595: goto bad;
1.114 itojun 1596: }
1597: if (ipt->ipt_ptr < 5) {
1598: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1599: goto bad;
1600: }
1.15 cgd 1601: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1602: if (++ipt->ipt_oflw == 0) {
1603: code = (u_char *)&ipt->ipt_ptr -
1604: (u_char *)ip;
1.1 cgd 1605: goto bad;
1.114 itojun 1606: }
1.1 cgd 1607: break;
1608: }
1.104 thorpej 1609: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1610: switch (ipt->ipt_flg) {
1611:
1612: case IPOPT_TS_TSONLY:
1613: break;
1614:
1615: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1616: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1617: sizeof(struct in_addr) > ipt->ipt_len) {
1618: code = (u_char *)&ipt->ipt_ptr -
1619: (u_char *)ip;
1.1 cgd 1620: goto bad;
1.114 itojun 1621: }
1.13 mycroft 1622: ipaddr.sin_addr = dst;
1.96 thorpej 1623: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1624: m->m_pkthdr.rcvif));
1.13 mycroft 1625: if (ia == 0)
1626: continue;
1.104 thorpej 1627: bcopy(&ia->ia_addr.sin_addr,
1628: cp0, sizeof(struct in_addr));
1.1 cgd 1629: ipt->ipt_ptr += sizeof(struct in_addr);
1630: break;
1631:
1632: case IPOPT_TS_PRESPEC:
1.66 thorpej 1633: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1634: sizeof(struct in_addr) > ipt->ipt_len) {
1635: code = (u_char *)&ipt->ipt_ptr -
1636: (u_char *)ip;
1.1 cgd 1637: goto bad;
1.114 itojun 1638: }
1.104 thorpej 1639: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1640: sizeof(struct in_addr));
1.96 thorpej 1641: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1642: == NULL)
1.1 cgd 1643: continue;
1644: ipt->ipt_ptr += sizeof(struct in_addr);
1645: break;
1646:
1647: default:
1.114 itojun 1648: /* XXX can't take &ipt->ipt_flg */
1649: code = (u_char *)&ipt->ipt_ptr -
1650: (u_char *)ip + 1;
1.1 cgd 1651: goto bad;
1652: }
1653: ntime = iptime();
1.107 thorpej 1654: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1655: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1656: sizeof(n_time));
1657: ipt->ipt_ptr += sizeof(n_time);
1658: }
1659: }
1660: if (forward) {
1.26 thorpej 1661: if (ip_forwsrcrt == 0) {
1662: type = ICMP_UNREACH;
1663: code = ICMP_UNREACH_SRCFAIL;
1664: goto bad;
1665: }
1.1 cgd 1666: ip_forward(m, 1);
1667: return (1);
1.13 mycroft 1668: }
1669: return (0);
1.1 cgd 1670: bad:
1.13 mycroft 1671: icmp_error(m, type, code, 0, 0);
1672: ipstat.ips_badoptions++;
1.1 cgd 1673: return (1);
1674: }
1675:
1676: /*
1677: * Given address of next destination (final or next hop),
1678: * return internet address info of interface to be used to get there.
1679: */
1680: struct in_ifaddr *
1.211 perry 1681: ip_rtaddr(struct in_addr dst)
1.1 cgd 1682: {
1.249 dyoung 1683: struct rtentry *rt;
1684: union {
1685: struct sockaddr dst;
1686: struct sockaddr_in dst4;
1687: } u;
1688:
1689: sockaddr_in_init(&u.dst4, &dst, 0);
1690:
1691: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1692: return NULL;
1693:
1694: return ifatoia(rt->rt_ifa);
1.1 cgd 1695: }
1696:
1697: /*
1698: * Save incoming source route for use in replies,
1699: * to be picked up later by ip_srcroute if the receiver is interested.
1700: */
1.13 mycroft 1701: void
1.211 perry 1702: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1703: {
1704: unsigned olen;
1705:
1706: olen = option[IPOPT_OLEN];
1707: #ifdef DIAGNOSTIC
1708: if (ipprintfs)
1.39 christos 1709: printf("save_rte: olen %d\n", olen);
1.89 itojun 1710: #endif /* 0 */
1.1 cgd 1711: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1712: return;
1.244 christos 1713: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1 cgd 1714: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1715: ip_srcrt.dst = dst;
1716: }
1717:
1718: /*
1719: * Retrieve incoming source route for use in replies,
1720: * in the same form used by setsockopt.
1721: * The first hop is placed before the options, will be removed later.
1722: */
1723: struct mbuf *
1.211 perry 1724: ip_srcroute(void)
1.1 cgd 1725: {
1.109 augustss 1726: struct in_addr *p, *q;
1727: struct mbuf *m;
1.1 cgd 1728:
1729: if (ip_nhops == 0)
1.237 dyoung 1730: return NULL;
1.1 cgd 1731: m = m_get(M_DONTWAIT, MT_SOOPTS);
1732: if (m == 0)
1.237 dyoung 1733: return NULL;
1.1 cgd 1734:
1.164 matt 1735: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1736: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1737:
1738: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1739: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1740: OPTSIZ;
1741: #ifdef DIAGNOSTIC
1742: if (ipprintfs)
1.39 christos 1743: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1744: #endif
1745:
1746: /*
1747: * First save first hop for return route
1748: */
1749: p = &ip_srcrt.route[ip_nhops - 1];
1750: *(mtod(m, struct in_addr *)) = *p--;
1751: #ifdef DIAGNOSTIC
1752: if (ipprintfs)
1.39 christos 1753: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1754: #endif
1755:
1756: /*
1757: * Copy option fields and padding (nop) to mbuf.
1758: */
1759: ip_srcrt.nop = IPOPT_NOP;
1760: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1761: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1762: OPTSIZ);
1763: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1764: sizeof(struct in_addr) + OPTSIZ);
1765: #undef OPTSIZ
1766: /*
1767: * Record return path as an IP source route,
1768: * reversing the path (pointers are now aligned).
1769: */
1770: while (p >= ip_srcrt.route) {
1771: #ifdef DIAGNOSTIC
1772: if (ipprintfs)
1.39 christos 1773: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1774: #endif
1775: *q++ = *p--;
1776: }
1777: /*
1778: * Last hop goes to final destination.
1779: */
1780: *q = ip_srcrt.dst;
1781: #ifdef DIAGNOSTIC
1782: if (ipprintfs)
1.39 christos 1783: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1784: #endif
1785: return (m);
1786: }
1787:
1.139 matt 1788: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1789: [PRC_MSGSIZE] = EMSGSIZE,
1790: [PRC_HOSTDEAD] = EHOSTDOWN,
1791: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1792: [PRC_UNREACH_NET] = EHOSTUNREACH,
1793: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1794: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1795: [PRC_UNREACH_PORT] = ECONNREFUSED,
1796: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1797: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1798: };
1799:
1800: /*
1801: * Forward a packet. If some error occurs return the sender
1802: * an icmp packet. Note we can't always generate a meaningful
1803: * icmp message because icmp doesn't have a large enough repertoire
1804: * of codes and types.
1805: *
1806: * If not forwarding, just drop the packet. This could be confusing
1807: * if ipforwarding was zero but some routing protocol was advancing
1808: * us as a gateway to somewhere. However, we must let the routing
1809: * protocol deal with that.
1810: *
1811: * The srcrt parameter indicates whether the packet is being forwarded
1812: * via a source route.
1813: */
1.13 mycroft 1814: void
1.211 perry 1815: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1816: {
1.109 augustss 1817: struct ip *ip = mtod(m, struct ip *);
1818: struct rtentry *rt;
1.220 christos 1819: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1820: struct mbuf *mcopy;
1.13 mycroft 1821: n_long dest;
1.249 dyoung 1822: union {
1823: struct sockaddr dst;
1824: struct sockaddr_in dst4;
1825: } u;
1.164 matt 1826:
1827: /*
1828: * We are now in the output path.
1829: */
1830: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1831:
1832: /*
1833: * Clear any in-bound checksum flags for this packet.
1834: */
1835: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1836:
1.13 mycroft 1837: dest = 0;
1.1 cgd 1838: #ifdef DIAGNOSTIC
1.224 joerg 1839: if (ipprintfs) {
1840: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1841: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1842: }
1.1 cgd 1843: #endif
1.93 sommerfe 1844: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1845: ipstat.ips_cantforward++;
1846: m_freem(m);
1847: return;
1848: }
1849: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1850: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1851: return;
1852: }
1853:
1.249 dyoung 1854: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1855: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1856: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1857: return;
1.1 cgd 1858: }
1859:
1860: /*
1.34 mycroft 1861: * Save at most 68 bytes of the packet in case
1.1 cgd 1862: * we need to generate an ICMP message to the src.
1.119 itojun 1863: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1864: */
1.155 itojun 1865: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1866: if (mcopy)
1867: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1868:
1.221 christos 1869: ip->ip_ttl -= IPTTLDEC;
1870:
1.1 cgd 1871: /*
1872: * If forwarding packet using same interface that it came in on,
1873: * perhaps should send a redirect to sender to shortcut a hop.
1874: * Only send redirect if source is sending directly to us,
1875: * and if packet was not source routed (or has any options).
1876: * Also, don't send redirect if forwarding using a default route
1877: * or a route modified by a redirect.
1878: */
1879: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1880: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1881: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1882: ipsendredirects && !srcrt) {
1.19 mycroft 1883: if (rt->rt_ifa &&
1884: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1885: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1886: if (rt->rt_flags & RTF_GATEWAY)
1887: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1888: else
1889: dest = ip->ip_dst.s_addr;
1890: /*
1891: * Router requirements says to only send host
1892: * redirects.
1893: */
1894: type = ICMP_REDIRECT;
1895: code = ICMP_REDIRECT_HOST;
1.1 cgd 1896: #ifdef DIAGNOSTIC
1.77 thorpej 1897: if (ipprintfs)
1898: printf("redirect (%d) to %x\n", code,
1899: (u_int32_t)dest);
1.1 cgd 1900: #endif
1901: }
1902: }
1903:
1.238 dyoung 1904: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1905: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1906: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1907:
1.1 cgd 1908: if (error)
1909: ipstat.ips_cantforward++;
1910: else {
1911: ipstat.ips_forward++;
1912: if (type)
1913: ipstat.ips_redirectsent++;
1914: else {
1.63 matt 1915: if (mcopy) {
1916: #ifdef GATEWAY
1.64 thorpej 1917: if (mcopy->m_flags & M_CANFASTFWD)
1918: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1919: #endif
1.1 cgd 1920: m_freem(mcopy);
1.63 matt 1921: }
1.1 cgd 1922: return;
1923: }
1924: }
1925: if (mcopy == NULL)
1926: return;
1.13 mycroft 1927:
1.1 cgd 1928: switch (error) {
1929:
1930: case 0: /* forwarded, but need redirect */
1931: /* type, code set above */
1932: break;
1933:
1934: case ENETUNREACH: /* shouldn't happen, checked above */
1935: case EHOSTUNREACH:
1936: case ENETDOWN:
1937: case EHOSTDOWN:
1938: default:
1939: type = ICMP_UNREACH;
1940: code = ICMP_UNREACH_HOST;
1941: break;
1942:
1943: case EMSGSIZE:
1944: type = ICMP_UNREACH;
1945: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1946: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.257 dyoung 1947: if ((rt = rtcache_getrt(&ipforward_rt)) != NULL)
1948: destmtu = rt->rt_ifp->if_mtu;
1.89 itojun 1949: #else
1950: /*
1951: * If the packet is routed over IPsec tunnel, tell the
1952: * originator the tunnel MTU.
1953: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1954: * XXX quickhack!!!
1955: */
1.257 dyoung 1956: if ((rt = rtcache_getrt(&ipforward_rt)) != NULL) {
1.89 itojun 1957: struct secpolicy *sp;
1958: int ipsecerror;
1.95 itojun 1959: size_t ipsechdr;
1.89 itojun 1960: struct route *ro;
1961:
1962: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1963: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1964: &ipsecerror);
1.89 itojun 1965:
1966: if (sp == NULL)
1.257 dyoung 1967: destmtu = rt->rt_ifp->if_mtu;
1.89 itojun 1968: else {
1969: /* count IPsec header size */
1.95 itojun 1970: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1971: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1972:
1973: /*
1974: * find the correct route for outer IPv4
1975: * header, compute tunnel MTU.
1976: */
1.220 christos 1977:
1.89 itojun 1978: if (sp->req != NULL
1.95 itojun 1979: && sp->req->sav != NULL
1980: && sp->req->sav->sah != NULL) {
1981: ro = &sp->req->sav->sah->sa_route;
1.257 dyoung 1982: if (rt && rt->rt_ifp) {
1.220 christos 1983: destmtu =
1.257 dyoung 1984: rt->rt_rmx.rmx_mtu ?
1985: rt->rt_rmx.rmx_mtu :
1986: rt->rt_ifp->if_mtu;
1.220 christos 1987: destmtu -= ipsechdr;
1.89 itojun 1988: }
1989: }
1990:
1.173 jonathan 1991: #ifdef IPSEC
1.89 itojun 1992: key_freesp(sp);
1.173 jonathan 1993: #else
1994: KEY_FREESP(&sp);
1995: #endif
1.89 itojun 1996: }
1997: }
1998: #endif /*IPSEC*/
1.1 cgd 1999: ipstat.ips_cantfrag++;
2000: break;
2001:
2002: case ENOBUFS:
1.143 itojun 2003: #if 1
2004: /*
2005: * a router should not generate ICMP_SOURCEQUENCH as
2006: * required in RFC1812 Requirements for IP Version 4 Routers.
2007: * source quench could be a big problem under DoS attacks,
1.149 wiz 2008: * or if the underlying interface is rate-limited.
1.143 itojun 2009: */
2010: if (mcopy)
2011: m_freem(mcopy);
2012: return;
2013: #else
1.1 cgd 2014: type = ICMP_SOURCEQUENCH;
2015: code = 0;
2016: break;
1.143 itojun 2017: #endif
1.1 cgd 2018: }
1.220 christos 2019: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2020: }
2021:
2022: void
1.211 perry 2023: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2024: struct mbuf *m)
1.44 thorpej 2025: {
2026:
2027: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2028: struct timeval tv;
2029:
2030: microtime(&tv);
1.244 christos 2031: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2032: SCM_TIMESTAMP, SOL_SOCKET);
2033: if (*mp)
2034: mp = &(*mp)->m_next;
2035: }
2036: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2037: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2038: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2039: if (*mp)
2040: mp = &(*mp)->m_next;
2041: }
2042: #ifdef notyet
2043: /*
2044: * XXX
2045: * Moving these out of udp_input() made them even more broken
2046: * than they already were.
2047: * - fenner@parc.xerox.com
2048: */
2049: /* options were tossed already */
2050: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2051: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2052: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2053: if (*mp)
2054: mp = &(*mp)->m_next;
2055: }
2056: /* ip_srcroute doesn't do what we want here, need to fix */
2057: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2058: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2059: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2060: if (*mp)
2061: mp = &(*mp)->m_next;
2062: }
2063: #endif
2064: if (inp->inp_flags & INP_RECVIF) {
2065: struct sockaddr_dl sdl;
2066:
1.252 dyoung 2067: sockaddr_dl_init(&sdl, sizeof(sdl),
2068: (m->m_pkthdr.rcvif != NULL)
2069: ? m->m_pkthdr.rcvif->if_index
2070: : 0,
2071: 0, NULL, 0, NULL, 0);
1.251 dyoung 2072: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2073: if (*mp)
2074: mp = &(*mp)->m_next;
2075: }
1.13 mycroft 2076: }
2077:
1.189 atatat 2078: /*
1.228 elad 2079: * sysctl helper routine for net.inet.ip.forwsrcrt.
2080: */
2081: static int
2082: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2083: {
2084: int error, tmp;
2085: struct sysctlnode node;
2086:
2087: node = *rnode;
2088: tmp = ip_forwsrcrt;
2089: node.sysctl_data = &tmp;
2090: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2091: if (error || newp == NULL)
2092: return (error);
2093:
1.230 elad 2094: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232 elad 2095: 0, NULL, NULL, NULL))
1.228 elad 2096: return (EPERM);
2097:
2098: ip_forwsrcrt = tmp;
2099:
2100: return (0);
2101: }
2102:
2103: /*
1.189 atatat 2104: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2105: * range of the new value and tweaks timers if it changes.
2106: */
2107: static int
2108: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2109: {
1.189 atatat 2110: int error, tmp;
2111: struct sysctlnode node;
2112:
2113: node = *rnode;
2114: tmp = ip_mtudisc_timeout;
2115: node.sysctl_data = &tmp;
2116: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2117: if (error || newp == NULL)
2118: return (error);
2119: if (tmp < 0)
2120: return (EINVAL);
1.52 thorpej 2121:
1.189 atatat 2122: ip_mtudisc_timeout = tmp;
2123: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2124:
2125: return (0);
2126: }
1.54 lukem 2127:
1.65 matt 2128: #ifdef GATEWAY
1.189 atatat 2129: /*
1.247 liamjfoy 2130: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 2131: */
2132: static int
2133: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2134: {
2135: int s;
1.67 thorpej 2136:
1.217 atatat 2137: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247 liamjfoy 2138: if (s || newp == NULL)
1.189 atatat 2139: return (s);
1.212 perry 2140:
1.189 atatat 2141: s = splsoftnet();
2142: ipflow_reap(0);
2143: splx(s);
1.144 martin 2144:
1.189 atatat 2145: return (0);
2146: }
1.248 liamjfoy 2147:
2148: static int
2149: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
2150: {
2151: int error, tmp;
2152: struct sysctlnode node;
2153:
2154: node = *rnode;
2155: tmp = ip_hashsize;
2156: node.sysctl_data = &tmp;
2157: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2158: if (error || newp == NULL)
2159: return (error);
2160:
2161: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2162: /*
2163: * Can only fail due to malloc()
2164: */
2165: if (ipflow_invalidate_all(tmp))
2166: return ENOMEM;
2167: } else {
2168: /*
2169: * EINVAL if not a power of 2
2170: */
2171: return EINVAL;
2172: }
2173:
2174: return (0);
2175: }
1.189 atatat 2176: #endif /* GATEWAY */
1.117 tron 2177:
1.131 itojun 2178:
1.189 atatat 2179: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2180: {
2181: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2182:
1.197 atatat 2183: sysctl_createv(clog, 0, NULL, NULL,
2184: CTLFLAG_PERMANENT,
1.189 atatat 2185: CTLTYPE_NODE, "net", NULL,
2186: NULL, 0, NULL, 0,
2187: CTL_NET, CTL_EOL);
1.197 atatat 2188: sysctl_createv(clog, 0, NULL, NULL,
2189: CTLFLAG_PERMANENT,
1.203 atatat 2190: CTLTYPE_NODE, "inet",
2191: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2192: NULL, 0, NULL, 0,
2193: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2194: sysctl_createv(clog, 0, NULL, NULL,
2195: CTLFLAG_PERMANENT,
1.203 atatat 2196: CTLTYPE_NODE, "ip",
2197: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2198: NULL, 0, NULL, 0,
2199: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2200:
1.197 atatat 2201: sysctl_createv(clog, 0, NULL, NULL,
2202: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2203: CTLTYPE_INT, "forwarding",
2204: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2205: NULL, 0, &ipforwarding, 0,
2206: CTL_NET, PF_INET, IPPROTO_IP,
2207: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2208: sysctl_createv(clog, 0, NULL, NULL,
2209: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2210: CTLTYPE_INT, "redirect",
2211: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2212: NULL, 0, &ipsendredirects, 0,
2213: CTL_NET, PF_INET, IPPROTO_IP,
2214: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2215: sysctl_createv(clog, 0, NULL, NULL,
2216: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2217: CTLTYPE_INT, "ttl",
2218: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2219: NULL, 0, &ip_defttl, 0,
2220: CTL_NET, PF_INET, IPPROTO_IP,
2221: IPCTL_DEFTTL, CTL_EOL);
2222: #ifdef IPCTL_DEFMTU
1.197 atatat 2223: sysctl_createv(clog, 0, NULL, NULL,
2224: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2225: CTLTYPE_INT, "mtu",
2226: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2227: NULL, 0, &ip_mtu, 0,
2228: CTL_NET, PF_INET, IPPROTO_IP,
2229: IPCTL_DEFMTU, CTL_EOL);
2230: #endif /* IPCTL_DEFMTU */
1.197 atatat 2231: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2232: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2233: CTLTYPE_INT, "forwsrcrt",
2234: SYSCTL_DESCR("Enable forwarding of source-routed "
2235: "datagrams"),
1.228 elad 2236: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2237: CTL_NET, PF_INET, IPPROTO_IP,
2238: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2239: sysctl_createv(clog, 0, NULL, NULL,
2240: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2241: CTLTYPE_INT, "directed-broadcast",
2242: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2243: NULL, 0, &ip_directedbcast, 0,
2244: CTL_NET, PF_INET, IPPROTO_IP,
2245: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2246: sysctl_createv(clog, 0, NULL, NULL,
2247: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2248: CTLTYPE_INT, "allowsrcrt",
2249: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2250: NULL, 0, &ip_allowsrcrt, 0,
2251: CTL_NET, PF_INET, IPPROTO_IP,
2252: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2253: sysctl_createv(clog, 0, NULL, NULL,
2254: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2255: CTLTYPE_INT, "subnetsarelocal",
2256: SYSCTL_DESCR("Whether logical subnets are considered "
2257: "local"),
1.189 atatat 2258: NULL, 0, &subnetsarelocal, 0,
2259: CTL_NET, PF_INET, IPPROTO_IP,
2260: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2261: sysctl_createv(clog, 0, NULL, NULL,
2262: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2263: CTLTYPE_INT, "mtudisc",
2264: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2265: NULL, 0, &ip_mtudisc, 0,
2266: CTL_NET, PF_INET, IPPROTO_IP,
2267: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2268: sysctl_createv(clog, 0, NULL, NULL,
2269: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2270: CTLTYPE_INT, "anonportmin",
2271: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2272: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2273: CTL_NET, PF_INET, IPPROTO_IP,
2274: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2275: sysctl_createv(clog, 0, NULL, NULL,
2276: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2277: CTLTYPE_INT, "anonportmax",
2278: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2279: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2280: CTL_NET, PF_INET, IPPROTO_IP,
2281: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2282: sysctl_createv(clog, 0, NULL, NULL,
2283: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2284: CTLTYPE_INT, "mtudisctimeout",
2285: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2286: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2287: CTL_NET, PF_INET, IPPROTO_IP,
2288: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2289: #ifdef GATEWAY
1.197 atatat 2290: sysctl_createv(clog, 0, NULL, NULL,
2291: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2292: CTLTYPE_INT, "maxflows",
2293: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2294: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2295: CTL_NET, PF_INET, IPPROTO_IP,
2296: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2297: sysctl_createv(clog, 0, NULL, NULL,
2298: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2299: CTLTYPE_INT, "hashsize",
2300: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2301: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2302: CTL_NET, PF_INET, IPPROTO_IP,
2303: CTL_CREATE, CTL_EOL);
1.189 atatat 2304: #endif /* GATEWAY */
1.197 atatat 2305: sysctl_createv(clog, 0, NULL, NULL,
2306: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2307: CTLTYPE_INT, "hostzerobroadcast",
2308: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2309: NULL, 0, &hostzeroisbroadcast, 0,
2310: CTL_NET, PF_INET, IPPROTO_IP,
2311: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2312: #if NGIF > 0
1.197 atatat 2313: sysctl_createv(clog, 0, NULL, NULL,
2314: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2315: CTLTYPE_INT, "gifttl",
2316: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2317: NULL, 0, &ip_gif_ttl, 0,
2318: CTL_NET, PF_INET, IPPROTO_IP,
2319: IPCTL_GIF_TTL, CTL_EOL);
2320: #endif /* NGIF */
2321: #ifndef IPNOPRIVPORTS
1.197 atatat 2322: sysctl_createv(clog, 0, NULL, NULL,
2323: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2324: CTLTYPE_INT, "lowportmin",
2325: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2326: "to assign"),
1.189 atatat 2327: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2328: CTL_NET, PF_INET, IPPROTO_IP,
2329: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2330: sysctl_createv(clog, 0, NULL, NULL,
2331: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2332: CTLTYPE_INT, "lowportmax",
2333: SYSCTL_DESCR("Highest privileged ephemeral port number "
2334: "to assign"),
1.189 atatat 2335: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2336: CTL_NET, PF_INET, IPPROTO_IP,
2337: IPCTL_LOWPORTMAX, CTL_EOL);
2338: #endif /* IPNOPRIVPORTS */
1.197 atatat 2339: sysctl_createv(clog, 0, NULL, NULL,
2340: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2341: CTLTYPE_INT, "maxfragpackets",
2342: SYSCTL_DESCR("Maximum number of fragments to retain for "
2343: "possible reassembly"),
1.189 atatat 2344: NULL, 0, &ip_maxfragpackets, 0,
2345: CTL_NET, PF_INET, IPPROTO_IP,
2346: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2347: #if NGRE > 0
1.197 atatat 2348: sysctl_createv(clog, 0, NULL, NULL,
2349: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2350: CTLTYPE_INT, "grettl",
2351: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2352: NULL, 0, &ip_gre_ttl, 0,
2353: CTL_NET, PF_INET, IPPROTO_IP,
2354: IPCTL_GRE_TTL, CTL_EOL);
2355: #endif /* NGRE */
1.197 atatat 2356: sysctl_createv(clog, 0, NULL, NULL,
2357: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2358: CTLTYPE_INT, "checkinterface",
2359: SYSCTL_DESCR("Enable receive side of Strong ES model "
2360: "from RFC1122"),
1.189 atatat 2361: NULL, 0, &ip_checkinterface, 0,
2362: CTL_NET, PF_INET, IPPROTO_IP,
2363: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2364: sysctl_createv(clog, 0, NULL, NULL,
2365: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2366: CTLTYPE_INT, "random_id",
2367: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2368: NULL, 0, &ip_do_randomid, 0,
2369: CTL_NET, PF_INET, IPPROTO_IP,
2370: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2371: sysctl_createv(clog, 0, NULL, NULL,
2372: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2373: CTLTYPE_INT, "do_loopback_cksum",
2374: SYSCTL_DESCR("Perform IP checksum on loopback"),
2375: NULL, 0, &ip_do_loopback_cksum, 0,
2376: CTL_NET, PF_INET, IPPROTO_IP,
2377: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2378: sysctl_createv(clog, 0, NULL, NULL,
2379: CTLFLAG_PERMANENT,
2380: CTLTYPE_STRUCT, "stats",
2381: SYSCTL_DESCR("IP statistics"),
2382: NULL, 0, &ipstat, sizeof(ipstat),
2383: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2384: CTL_EOL);
1.1 cgd 2385: }
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