Annotation of src/sys/netinet/ip_input.c, Revision 1.223.6.1
1.223.6.1! simonb 1: /* $NetBSD: ip_input.c,v 1.223 2005/12/24 20:45:09 perry 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>
1.223.6.1! simonb 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.223 2005/12/24 20:45:09 perry 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>
1.1 cgd 124:
1.5 mycroft 125: #include <net/if.h>
1.44 thorpej 126: #include <net/if_dl.h>
1.5 mycroft 127: #include <net/route.h>
1.45 mrg 128: #include <net/pfil.h>
1.1 cgd 129:
1.5 mycroft 130: #include <netinet/in.h>
131: #include <netinet/in_systm.h>
132: #include <netinet/ip.h>
133: #include <netinet/in_pcb.h>
1.215 yamt 134: #include <netinet/in_proto.h>
1.5 mycroft 135: #include <netinet/in_var.h>
136: #include <netinet/ip_var.h>
137: #include <netinet/ip_icmp.h>
1.89 itojun 138: /* just for gif_ttl */
139: #include <netinet/in_gif.h>
140: #include "gif.h"
1.144 martin 141: #include <net/if_gre.h>
142: #include "gre.h"
1.111 jdolecek 143:
144: #ifdef MROUTING
145: #include <netinet/ip_mroute.h>
146: #endif
1.89 itojun 147:
148: #ifdef IPSEC
149: #include <netinet6/ipsec.h>
150: #include <netkey/key.h>
151: #endif
1.173 jonathan 152: #ifdef FAST_IPSEC
153: #include <netipsec/ipsec.h>
154: #include <netipsec/key.h>
155: #endif /* FAST_IPSEC*/
1.44 thorpej 156:
1.1 cgd 157: #ifndef IPFORWARDING
158: #ifdef GATEWAY
159: #define IPFORWARDING 1 /* forward IP packets not for us */
160: #else /* GATEWAY */
161: #define IPFORWARDING 0 /* don't forward IP packets not for us */
162: #endif /* GATEWAY */
163: #endif /* IPFORWARDING */
164: #ifndef IPSENDREDIRECTS
165: #define IPSENDREDIRECTS 1
166: #endif
1.26 thorpej 167: #ifndef IPFORWSRCRT
1.47 cjs 168: #define IPFORWSRCRT 1 /* forward source-routed packets */
169: #endif
170: #ifndef IPALLOWSRCRT
1.48 mrg 171: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 172: #endif
1.53 kml 173: #ifndef IPMTUDISC
1.153 itojun 174: #define IPMTUDISC 1
1.53 kml 175: #endif
1.60 kml 176: #ifndef IPMTUDISCTIMEOUT
1.61 kml 177: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 178: #endif
1.53 kml 179:
1.27 thorpej 180: /*
181: * Note: DIRECTED_BROADCAST is handled this way so that previous
182: * configuration using this option will Just Work.
183: */
184: #ifndef IPDIRECTEDBCAST
185: #ifdef DIRECTED_BROADCAST
186: #define IPDIRECTEDBCAST 1
187: #else
188: #define IPDIRECTEDBCAST 0
189: #endif /* DIRECTED_BROADCAST */
190: #endif /* IPDIRECTEDBCAST */
1.1 cgd 191: int ipforwarding = IPFORWARDING;
192: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 193: int ip_defttl = IPDEFTTL;
1.26 thorpej 194: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 195: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 196: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 197: int ip_mtudisc = IPMTUDISC;
1.156 itojun 198: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 199: #ifdef DIAGNOSTIC
200: int ipprintfs = 0;
201: #endif
1.184 jonathan 202:
203: int ip_do_randomid = 0;
204:
1.165 christos 205: /*
206: * XXX - Setting ip_checkinterface mostly implements the receive side of
207: * the Strong ES model described in RFC 1122, but since the routing table
208: * and transmit implementation do not implement the Strong ES model,
209: * setting this to 1 results in an odd hybrid.
210: *
211: * XXX - ip_checkinterface currently must be disabled if you use ipnat
212: * to translate the destination address to another local interface.
213: *
214: * XXX - ip_checkinterface must be disabled if you add IP aliases
215: * to the loopback interface instead of the interface where the
216: * packets for those addresses are received.
217: */
218: int ip_checkinterface = 0;
219:
1.1 cgd 220:
1.60 kml 221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
222:
1.1 cgd 223: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 224: u_long in_ifaddrhash; /* size of hash table - 1 */
225: int in_ifaddrentries; /* total number of addrs */
1.212 perry 226: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 227: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 228: u_long in_multihash; /* size of hash table - 1 */
229: int in_multientries; /* total number of addrs */
230: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 231: struct ifqueue ipintrq;
1.63 matt 232: struct ipstat ipstat;
1.183 jonathan 233: uint16_t ip_id;
1.75 thorpej 234:
1.121 thorpej 235: #ifdef PFIL_HOOKS
236: struct pfil_head inet_pfil_hook;
237: #endif
238:
1.194 jonathan 239: /*
240: * Cached copy of nmbclusters. If nbclusters is different,
241: * recalculate IP parameters derived from nmbclusters.
242: */
243: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 244: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 245:
1.195 thorpej 246: #define CHECK_NMBCLUSTER_PARAMS() \
247: do { \
248: if (__predict_false(ip_nmbclusters != nmbclusters)) \
249: ip_nmbclusters_changed(); \
250: } while (/*CONSTCOND*/0)
1.194 jonathan 251:
1.190 jonathan 252: /* IP datagram reassembly queues (hashed) */
253: #define IPREASS_NHASH_LOG2 6
254: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
255: #define IPREASS_HMASK (IPREASS_NHASH - 1)
256: #define IPREASS_HASH(x,y) \
257: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
258: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 259: int ipq_locked;
1.212 perry 260: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 261: static int ip_nfrags; /* total fragments in reass queues */
262:
263: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
264: int ip_maxfrags; /* limit on fragments. XXX sysctl */
265:
266:
267: /*
268: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
269: * IP reassembly queue buffer managment.
1.212 perry 270: *
1.194 jonathan 271: * We keep a count of total IP fragments (NB: not fragmented packets!)
272: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
273: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
274: * total fragments in reassembly queues.This AIMD policy avoids
275: * repeatedly deleting single packets under heavy fragmentation load
276: * (e.g., from lossy NFS peers).
277: */
1.212 perry 278: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 279: static void ip_reass_drophalf(void);
1.194 jonathan 280:
1.75 thorpej 281:
1.223 perry 282: static inline int ipq_lock_try(void);
283: static inline void ipq_unlock(void);
1.75 thorpej 284:
1.223 perry 285: static inline int
1.211 perry 286: ipq_lock_try(void)
1.75 thorpej 287: {
288: int s;
289:
1.132 thorpej 290: /*
1.149 wiz 291: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 292: * mbuf allocation.
293: */
294: s = splvm();
1.75 thorpej 295: if (ipq_locked) {
296: splx(s);
297: return (0);
298: }
299: ipq_locked = 1;
300: splx(s);
301: return (1);
302: }
303:
1.223 perry 304: static inline void
1.211 perry 305: ipq_unlock(void)
1.75 thorpej 306: {
307: int s;
308:
1.132 thorpej 309: s = splvm();
1.75 thorpej 310: ipq_locked = 0;
311: splx(s);
312: }
313:
314: #ifdef DIAGNOSTIC
315: #define IPQ_LOCK() \
316: do { \
317: if (ipq_lock_try() == 0) { \
318: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
319: panic("ipq_lock"); \
320: } \
1.159 perry 321: } while (/*CONSTCOND*/ 0)
1.75 thorpej 322: #define IPQ_LOCK_CHECK() \
323: do { \
324: if (ipq_locked == 0) { \
325: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
326: panic("ipq lock check"); \
327: } \
1.159 perry 328: } while (/*CONSTCOND*/ 0)
1.75 thorpej 329: #else
330: #define IPQ_LOCK() (void) ipq_lock_try()
331: #define IPQ_LOCK_CHECK() /* nothing */
332: #endif
333:
334: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 335:
1.200 simonb 336: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL);
337: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL);
1.72 thorpej 338:
1.135 thorpej 339: #ifdef INET_CSUM_COUNTERS
340: #include <sys/device.h>
341:
342: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
343: NULL, "inet", "hwcsum bad");
344: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
345: NULL, "inet", "hwcsum ok");
346: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
347: NULL, "inet", "swcsum");
348:
349: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
350:
1.201 matt 351: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
352: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
353: EVCNT_ATTACH_STATIC(ip_swcsum);
354:
1.135 thorpej 355: #else
356:
357: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
358:
359: #endif /* INET_CSUM_COUNTERS */
360:
1.1 cgd 361: /*
362: * We need to save the IP options in case a protocol wants to respond
363: * to an incoming packet over the same route if the packet got here
364: * using IP source routing. This allows connection establishment and
365: * maintenance when the remote end is on a network that is not known
366: * to us.
367: */
368: int ip_nhops = 0;
369: static struct ip_srcrt {
370: struct in_addr dst; /* final destination */
371: char nop; /* one NOP to align */
372: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
373: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
374: } ip_srcrt;
375:
1.210 perry 376: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 377:
1.164 matt 378: #ifdef MBUFTRACE
379: struct mowner ip_rx_mowner = { "internet", "rx" };
380: struct mowner ip_tx_mowner = { "internet", "tx" };
381: #endif
382:
1.1 cgd 383: /*
1.194 jonathan 384: * Compute IP limits derived from the value of nmbclusters.
385: */
386: static void
387: ip_nmbclusters_changed(void)
388: {
389: ip_maxfrags = nmbclusters / 4;
390: ip_nmbclusters = nmbclusters;
391: }
392:
393: /*
1.1 cgd 394: * IP initialization: fill in IP protocol switch table.
395: * All protocols not implemented in kernel go to raw IP protocol handler.
396: */
1.8 mycroft 397: void
1.211 perry 398: ip_init(void)
1.1 cgd 399: {
1.199 matt 400: const struct protosw *pr;
1.109 augustss 401: int i;
1.1 cgd 402:
403: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
404: if (pr == 0)
405: panic("ip_init");
406: for (i = 0; i < IPPROTO_MAX; i++)
407: ip_protox[i] = pr - inetsw;
408: for (pr = inetdomain.dom_protosw;
409: pr < inetdomain.dom_protoswNPROTOSW; pr++)
410: if (pr->pr_domain->dom_family == PF_INET &&
411: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
412: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 413:
1.190 jonathan 414: for (i = 0; i < IPREASS_NHASH; i++)
415: LIST_INIT(&ipq[i]);
416:
1.223.6.1! simonb 417: ip_id = time_second & 0xfffff;
1.194 jonathan 418:
1.1 cgd 419: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 420: ip_nmbclusters_changed();
421:
1.181 jonathan 422: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 423: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
424: M_WAITOK, &in_ifaddrhash);
1.166 matt 425: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
426: M_WAITOK, &in_multihash);
1.160 itojun 427: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 428: #ifdef GATEWAY
429: ipflow_init();
430: #endif
1.121 thorpej 431:
432: #ifdef PFIL_HOOKS
433: /* Register our Packet Filter hook. */
1.126 thorpej 434: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
435: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 436: i = pfil_head_register(&inet_pfil_hook);
437: if (i != 0)
438: printf("ip_init: WARNING: unable to register pfil hook, "
439: "error %d\n", i);
440: #endif /* PFIL_HOOKS */
1.135 thorpej 441:
1.164 matt 442: #ifdef MBUFTRACE
443: MOWNER_ATTACH(&ip_tx_mowner);
444: MOWNER_ATTACH(&ip_rx_mowner);
445: #endif /* MBUFTRACE */
1.1 cgd 446: }
447:
448: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
449: struct route ipforward_rt;
450:
451: /*
1.89 itojun 452: * IP software interrupt routine
453: */
454: void
1.211 perry 455: ipintr(void)
1.89 itojun 456: {
457: int s;
458: struct mbuf *m;
459:
460: while (1) {
1.132 thorpej 461: s = splnet();
1.89 itojun 462: IF_DEQUEUE(&ipintrq, m);
463: splx(s);
464: if (m == 0)
465: return;
1.164 matt 466: MCLAIM(m, &ip_rx_mowner);
1.89 itojun 467: ip_input(m);
468: }
469: }
470:
471: /*
1.1 cgd 472: * Ip input routine. Checksum and byte swap header. If fragmented
473: * try to reassemble. Process options. Pass to next level.
474: */
1.8 mycroft 475: void
1.89 itojun 476: ip_input(struct mbuf *m)
1.1 cgd 477: {
1.109 augustss 478: struct ip *ip = NULL;
479: struct ipq *fp;
480: struct in_ifaddr *ia;
481: struct ifaddr *ifa;
1.25 cgd 482: struct ipqent *ipqe;
1.89 itojun 483: int hlen = 0, mff, len;
1.100 itojun 484: int downmatch;
1.165 christos 485: int checkif;
1.169 itojun 486: int srcrt = 0;
1.190 jonathan 487: u_int hash;
1.173 jonathan 488: #ifdef FAST_IPSEC
489: struct m_tag *mtag;
490: struct tdb_ident *tdbi;
491: struct secpolicy *sp;
492: int s, error;
493: #endif /* FAST_IPSEC */
1.1 cgd 494:
1.164 matt 495: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 496: #ifdef DIAGNOSTIC
497: if ((m->m_flags & M_PKTHDR) == 0)
498: panic("ipintr no HDR");
1.89 itojun 499: #endif
1.164 matt 500:
1.1 cgd 501: /*
502: * If no IP addresses have been set yet but the interfaces
503: * are receiving, can't do anything with incoming packets yet.
504: */
1.181 jonathan 505: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 506: goto bad;
507: ipstat.ips_total++;
1.154 thorpej 508: /*
509: * If the IP header is not aligned, slurp it up into a new
510: * mbuf with space for link headers, in the event we forward
511: * it. Otherwise, if it is aligned, make sure the entire
512: * base IP header is in the first mbuf of the chain.
513: */
514: if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
515: if ((m = m_copyup(m, sizeof(struct ip),
516: (max_linkhdr + 3) & ~3)) == NULL) {
517: /* XXXJRT new stat, please */
518: ipstat.ips_toosmall++;
519: return;
520: }
521: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
522: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
523: ipstat.ips_toosmall++;
524: return;
525: }
1.1 cgd 526: }
527: ip = mtod(m, struct ip *);
1.13 mycroft 528: if (ip->ip_v != IPVERSION) {
529: ipstat.ips_badvers++;
530: goto bad;
531: }
1.1 cgd 532: hlen = ip->ip_hl << 2;
533: if (hlen < sizeof(struct ip)) { /* minimum header length */
534: ipstat.ips_badhlen++;
535: goto bad;
536: }
537: if (hlen > m->m_len) {
538: if ((m = m_pullup(m, hlen)) == 0) {
539: ipstat.ips_badhlen++;
1.89 itojun 540: return;
1.1 cgd 541: }
542: ip = mtod(m, struct ip *);
543: }
1.98 thorpej 544:
1.85 hwr 545: /*
1.99 thorpej 546: * RFC1122: packets with a multicast source address are
1.98 thorpej 547: * not allowed.
1.85 hwr 548: */
549: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 550: ipstat.ips_badaddr++;
1.85 hwr 551: goto bad;
1.129 itojun 552: }
553:
554: /* 127/8 must not appear on wire - RFC1122 */
555: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
556: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 557: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
558: ipstat.ips_badaddr++;
1.129 itojun 559: goto bad;
1.130 itojun 560: }
1.85 hwr 561: }
562:
1.135 thorpej 563: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 564: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 565: M_CSUM_IPv4_BAD)) {
566: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
567: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
568: goto badcsum;
569:
570: case M_CSUM_IPv4:
571: /* Checksum was okay. */
572: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
573: break;
574:
575: default:
1.206 thorpej 576: /*
577: * Must compute it ourselves. Maybe skip checksum on
578: * loopback interfaces.
579: */
580: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
581: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
582: INET_CSUM_COUNTER_INCR(&ip_swcsum);
583: if (in_cksum(m, hlen) != 0)
584: goto badcsum;
585: }
1.135 thorpej 586: break;
1.1 cgd 587: }
588:
1.121 thorpej 589: /* Retrieve the packet length. */
590: len = ntohs(ip->ip_len);
1.81 proff 591:
592: /*
593: * Check for additional length bogosity
594: */
1.84 proff 595: if (len < hlen) {
1.81 proff 596: ipstat.ips_badlen++;
597: goto bad;
598: }
1.1 cgd 599:
600: /*
601: * Check that the amount of data in the buffers
602: * is as at least much as the IP header would have us expect.
603: * Trim mbufs if longer than we expect.
604: * Drop packet if shorter than we expect.
605: */
1.35 mycroft 606: if (m->m_pkthdr.len < len) {
1.1 cgd 607: ipstat.ips_tooshort++;
608: goto bad;
609: }
1.35 mycroft 610: if (m->m_pkthdr.len > len) {
1.1 cgd 611: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 612: m->m_len = len;
613: m->m_pkthdr.len = len;
1.1 cgd 614: } else
1.35 mycroft 615: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 616: }
617:
1.193 scw 618: #if defined(IPSEC)
1.149 wiz 619: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 620: m->m_flags &= ~M_CANFASTFWD;
621: #else
1.64 thorpej 622: /*
623: * Assume that we can create a fast-forward IP flow entry
624: * based on this packet.
625: */
626: m->m_flags |= M_CANFASTFWD;
1.94 itojun 627: #endif
1.64 thorpej 628:
1.36 mrg 629: #ifdef PFIL_HOOKS
1.33 mrg 630: /*
1.64 thorpej 631: * Run through list of hooks for input packets. If there are any
632: * filters which require that additional packets in the flow are
633: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
634: * Note that filters must _never_ set this flag, as another filter
635: * in the list may have previously cleared it.
1.33 mrg 636: */
1.127 itojun 637: /*
638: * let ipfilter look at packet on the wire,
639: * not the decapsulated packet.
640: */
641: #ifdef IPSEC
1.136 itojun 642: if (!ipsec_getnhist(m))
1.186 scw 643: #elif defined(FAST_IPSEC)
644: if (!ipsec_indone(m))
1.127 itojun 645: #else
646: if (1)
647: #endif
648: {
1.169 itojun 649: struct in_addr odst;
650:
651: odst = ip->ip_dst;
1.127 itojun 652: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 653: PFIL_IN) != 0)
654: return;
1.127 itojun 655: if (m == NULL)
656: return;
657: ip = mtod(m, struct ip *);
1.142 darrenr 658: hlen = ip->ip_hl << 2;
1.205 darrenr 659: /*
660: * XXX The setting of "srcrt" here is to prevent ip_forward()
661: * from generating ICMP redirects for packets that have
662: * been redirected by a hook back out on to the same LAN that
663: * they came from and is not an indication that the packet
664: * is being inffluenced by source routing options. This
665: * allows things like
666: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
667: * where tlp0 is both on the 1.1.1.0/24 network and is the
668: * default route for hosts on 1.1.1.0/24. Of course this
669: * also requires a "map tlp0 ..." to complete the story.
670: * One might argue whether or not this kind of network config.
1.212 perry 671: * should be supported in this manner...
1.205 darrenr 672: */
1.169 itojun 673: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 674: }
1.36 mrg 675: #endif /* PFIL_HOOKS */
1.123 thorpej 676:
677: #ifdef ALTQ
678: /* XXX Temporary until ALTQ is changed to use a pfil hook */
679: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
680: /* packet dropped by traffic conditioner */
681: return;
682: }
683: #endif
1.121 thorpej 684:
685: /*
1.1 cgd 686: * Process options and, if not destined for us,
687: * ship it on. ip_dooptions returns 1 when an
688: * error was detected (causing an icmp message
689: * to be sent and the original packet to be freed).
690: */
691: ip_nhops = 0; /* for source routed packets */
692: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 693: return;
1.1 cgd 694:
695: /*
1.165 christos 696: * Enable a consistency check between the destination address
697: * and the arrival interface for a unicast packet (the RFC 1122
698: * strong ES model) if IP forwarding is disabled and the packet
699: * is not locally generated.
700: *
701: * XXX - Checking also should be disabled if the destination
702: * address is ipnat'ed to a different interface.
703: *
704: * XXX - Checking is incompatible with IP aliases added
705: * to the loopback interface instead of the interface where
706: * the packets are received.
707: *
708: * XXX - We need to add a per ifaddr flag for this so that
709: * we get finer grain control.
710: */
711: checkif = ip_checkinterface && (ipforwarding == 0) &&
712: (m->m_pkthdr.rcvif != NULL) &&
713: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
714:
715: /*
1.1 cgd 716: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 717: *
718: * Traditional 4.4BSD did not consult IFF_UP at all.
719: * The behavior here is to treat addresses on !IFF_UP interface
720: * as not mine.
1.1 cgd 721: */
1.100 itojun 722: downmatch = 0;
1.140 matt 723: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 724: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 725: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
726: continue;
1.97 itojun 727: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
728: break;
1.100 itojun 729: else
730: downmatch++;
1.97 itojun 731: }
732: }
1.86 thorpej 733: if (ia != NULL)
734: goto ours;
1.57 tls 735: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 736: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 737: if (ifa->ifa_addr->sa_family != AF_INET)
738: continue;
1.57 tls 739: ia = ifatoia(ifa);
1.35 mycroft 740: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
741: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 742: /*
743: * Look for all-0's host part (old broadcast addr),
744: * either for subnet or net.
745: */
746: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 747: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 748: goto ours;
1.57 tls 749: /*
750: * An interface with IP address zero accepts
751: * all packets that arrive on that interface.
752: */
753: if (in_nullhost(ia->ia_addr.sin_addr))
754: goto ours;
1.1 cgd 755: }
756: }
1.18 mycroft 757: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 758: struct in_multi *inm;
759: #ifdef MROUTING
760: extern struct socket *ip_mrouter;
1.10 brezak 761:
1.4 hpeyerl 762: if (ip_mrouter) {
763: /*
764: * If we are acting as a multicast router, all
765: * incoming multicast packets are passed to the
766: * kernel-level multicast forwarding function.
767: * The packet is returned (relatively) intact; if
768: * ip_mforward() returns a non-zero value, the packet
769: * must be discarded, else it may be accepted below.
770: *
771: * (The IP ident field is put in the same byte order
772: * as expected when ip_mforward() is called from
773: * ip_output().)
774: */
1.13 mycroft 775: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
776: ipstat.ips_cantforward++;
1.4 hpeyerl 777: m_freem(m);
1.89 itojun 778: return;
1.4 hpeyerl 779: }
780:
781: /*
782: * The process-level routing demon needs to receive
783: * all multicast IGMP packets, whether or not this
784: * host belongs to their destination groups.
785: */
786: if (ip->ip_p == IPPROTO_IGMP)
787: goto ours;
1.13 mycroft 788: ipstat.ips_forward++;
1.4 hpeyerl 789: }
790: #endif
791: /*
792: * See if we belong to the destination multicast group on the
793: * arrival interface.
794: */
795: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
796: if (inm == NULL) {
1.13 mycroft 797: ipstat.ips_cantforward++;
1.4 hpeyerl 798: m_freem(m);
1.89 itojun 799: return;
1.4 hpeyerl 800: }
801: goto ours;
802: }
1.19 mycroft 803: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 804: in_nullhost(ip->ip_dst))
1.1 cgd 805: goto ours;
806:
807: /*
808: * Not for us; forward if possible and desirable.
809: */
810: if (ipforwarding == 0) {
811: ipstat.ips_cantforward++;
812: m_freem(m);
1.100 itojun 813: } else {
814: /*
815: * If ip_dst matched any of my address on !IFF_UP interface,
816: * and there's no IFF_UP interface that matches ip_dst,
817: * send icmp unreach. Forwarding it will result in in-kernel
818: * forwarding loop till TTL goes to 0.
819: */
820: if (downmatch) {
821: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
822: ipstat.ips_cantforward++;
823: return;
824: }
1.145 itojun 825: #ifdef IPSEC
826: if (ipsec4_in_reject(m, NULL)) {
827: ipsecstat.in_polvio++;
828: goto bad;
829: }
830: #endif
1.173 jonathan 831: #ifdef FAST_IPSEC
832: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
833: s = splsoftnet();
834: if (mtag != NULL) {
835: tdbi = (struct tdb_ident *)(mtag + 1);
836: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
837: } else {
838: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 839: IP_FORWARDING, &error);
1.173 jonathan 840: }
841: if (sp == NULL) { /* NB: can happen if error */
842: splx(s);
843: /*XXX error stat???*/
844: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
845: goto bad;
846: }
847:
848: /*
849: * Check security policy against packet attributes.
850: */
851: error = ipsec_in_reject(sp, m);
852: KEY_FREESP(&sp);
853: splx(s);
854: if (error) {
855: ipstat.ips_cantforward++;
856: goto bad;
1.193 scw 857: }
858:
859: /*
860: * Peek at the outbound SP for this packet to determine if
861: * it's a Fast Forward candidate.
862: */
863: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
864: if (mtag != NULL)
865: m->m_flags &= ~M_CANFASTFWD;
866: else {
867: s = splsoftnet();
868: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
869: (IP_FORWARDING |
870: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
871: &error, NULL);
872: if (sp != NULL) {
873: m->m_flags &= ~M_CANFASTFWD;
874: KEY_FREESP(&sp);
875: }
876: splx(s);
1.173 jonathan 877: }
878: #endif /* FAST_IPSEC */
1.145 itojun 879:
1.169 itojun 880: ip_forward(m, srcrt);
1.100 itojun 881: }
1.89 itojun 882: return;
1.1 cgd 883:
884: ours:
885: /*
886: * If offset or IP_MF are set, must reassemble.
887: * Otherwise, nothing need be done.
888: * (We could look in the reassembly queue to see
889: * if the packet was previously fragmented,
890: * but it's not worth the time; just let them time out.)
891: */
1.155 itojun 892: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
893:
1.1 cgd 894: /*
895: * Look for queue of fragments
896: * of this datagram.
897: */
1.75 thorpej 898: IPQ_LOCK();
1.190 jonathan 899: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
900: /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
901: for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
902: fp = LIST_NEXT(fp, ipq_q)) {
1.1 cgd 903: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 904: in_hosteq(ip->ip_src, fp->ipq_src) &&
905: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 906: ip->ip_p == fp->ipq_p)
907: goto found;
1.190 jonathan 908:
909: }
1.1 cgd 910: fp = 0;
911: found:
912:
913: /*
914: * Adjust ip_len to not reflect header,
1.25 cgd 915: * set ipqe_mff if more fragments are expected,
1.1 cgd 916: * convert offset of this to bytes.
917: */
1.155 itojun 918: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
919: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 920: if (mff) {
1.16 cgd 921: /*
922: * Make sure that fragments have a data length
923: * that's a non-zero multiple of 8 bytes.
924: */
1.155 itojun 925: if (ntohs(ip->ip_len) == 0 ||
926: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 927: ipstat.ips_badfrags++;
1.75 thorpej 928: IPQ_UNLOCK();
1.16 cgd 929: goto bad;
930: }
931: }
1.155 itojun 932: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 933:
934: /*
935: * If datagram marked as having more fragments
936: * or if this is not the first fragment,
937: * attempt reassembly; if it succeeds, proceed.
938: */
1.155 itojun 939: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 940: ipstat.ips_fragments++;
1.72 thorpej 941: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 942: if (ipqe == NULL) {
943: ipstat.ips_rcvmemdrop++;
1.75 thorpej 944: IPQ_UNLOCK();
1.25 cgd 945: goto bad;
946: }
947: ipqe->ipqe_mff = mff;
1.50 thorpej 948: ipqe->ipqe_m = m;
1.25 cgd 949: ipqe->ipqe_ip = ip;
1.190 jonathan 950: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 951: if (m == 0) {
952: IPQ_UNLOCK();
1.89 itojun 953: return;
1.75 thorpej 954: }
1.13 mycroft 955: ipstat.ips_reassembled++;
1.50 thorpej 956: ip = mtod(m, struct ip *);
1.74 thorpej 957: hlen = ip->ip_hl << 2;
1.155 itojun 958: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 959: } else
960: if (fp)
961: ip_freef(fp);
1.75 thorpej 962: IPQ_UNLOCK();
1.79 mycroft 963: }
1.128 itojun 964:
1.173 jonathan 965: #if defined(IPSEC)
1.128 itojun 966: /*
967: * enforce IPsec policy checking if we are seeing last header.
968: * note that we do not visit this with protocols with pcb layer
969: * code - like udp/tcp/raw ip.
970: */
971: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
972: ipsec4_in_reject(m, NULL)) {
973: ipsecstat.in_polvio++;
974: goto bad;
975: }
976: #endif
1.173 jonathan 977: #if FAST_IPSEC
978: /*
979: * enforce IPsec policy checking if we are seeing last header.
980: * note that we do not visit this with protocols with pcb layer
981: * code - like udp/tcp/raw ip.
982: */
983: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
984: /*
985: * Check if the packet has already had IPsec processing
986: * done. If so, then just pass it along. This tag gets
987: * set during AH, ESP, etc. input handling, before the
988: * packet is returned to the ip input queue for delivery.
1.212 perry 989: */
1.173 jonathan 990: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
991: s = splsoftnet();
992: if (mtag != NULL) {
993: tdbi = (struct tdb_ident *)(mtag + 1);
994: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
995: } else {
996: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 997: IP_FORWARDING, &error);
1.173 jonathan 998: }
999: if (sp != NULL) {
1000: /*
1001: * Check security policy against packet attributes.
1002: */
1003: error = ipsec_in_reject(sp, m);
1004: KEY_FREESP(&sp);
1005: } else {
1006: /* XXX error stat??? */
1007: error = EINVAL;
1008: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1009: goto bad;
1010: }
1011: splx(s);
1012: if (error)
1013: goto bad;
1014: }
1015: #endif /* FAST_IPSEC */
1.1 cgd 1016:
1017: /*
1018: * Switch out to protocol's input routine.
1019: */
1.82 aidan 1020: #if IFA_STATS
1.122 itojun 1021: if (ia && ip)
1.155 itojun 1022: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1023: #endif
1.1 cgd 1024: ipstat.ips_delivered++;
1.89 itojun 1025: {
1026: int off = hlen, nh = ip->ip_p;
1027:
1028: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1029: return;
1030: }
1.1 cgd 1031: bad:
1032: m_freem(m);
1.135 thorpej 1033: return;
1034:
1035: badcsum:
1036: ipstat.ips_badsum++;
1037: m_freem(m);
1.1 cgd 1038: }
1039:
1040: /*
1041: * Take incoming datagram fragment and try to
1042: * reassemble it into whole datagram. If a chain for
1043: * reassembly of this datagram already exists, then it
1044: * is given as fp; otherwise have to make a chain.
1045: */
1.50 thorpej 1046: struct mbuf *
1.211 perry 1047: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1048: {
1.109 augustss 1049: struct mbuf *m = ipqe->ipqe_m;
1050: struct ipqent *nq, *p, *q;
1.25 cgd 1051: struct ip *ip;
1.1 cgd 1052: struct mbuf *t;
1.25 cgd 1053: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 1054: int i, next;
1055:
1.75 thorpej 1056: IPQ_LOCK_CHECK();
1057:
1.1 cgd 1058: /*
1059: * Presence of header sizes in mbufs
1060: * would confuse code below.
1061: */
1062: m->m_data += hlen;
1063: m->m_len -= hlen;
1064:
1.194 jonathan 1065: #ifdef notyet
1066: /* make sure fragment limit is up-to-date */
1067: CHECK_NMBCLUSTER_PARAMS();
1068:
1069: /* If we have too many fragments, drop the older half. */
1070: if (ip_nfrags >= ip_maxfrags)
1071: ip_reass_drophalf(void);
1072: #endif
1073:
1.1 cgd 1074: /*
1.192 jonathan 1075: * We are about to add a fragment; increment frag count.
1076: */
1077: ip_nfrags++;
1.212 perry 1078:
1.192 jonathan 1079: /*
1.1 cgd 1080: * If first fragment to arrive, create a reassembly queue.
1081: */
1082: if (fp == 0) {
1.131 itojun 1083: /*
1084: * Enforce upper bound on number of fragmented packets
1085: * for which we attempt reassembly;
1086: * If maxfrag is 0, never accept fragments.
1087: * If maxfrag is -1, accept all fragments without limitation.
1088: */
1089: if (ip_maxfragpackets < 0)
1090: ;
1091: else if (ip_nfragpackets >= ip_maxfragpackets)
1092: goto dropfrag;
1093: ip_nfragpackets++;
1.50 thorpej 1094: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1095: M_FTABLE, M_NOWAIT);
1096: if (fp == NULL)
1.1 cgd 1097: goto dropfrag;
1.190 jonathan 1098: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1099: fp->ipq_nfrags = 1;
1.1 cgd 1100: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1101: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1102: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1103: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1104: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1105: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1106: p = NULL;
1.1 cgd 1107: goto insert;
1.192 jonathan 1108: } else {
1109: fp->ipq_nfrags++;
1.1 cgd 1110: }
1111:
1112: /*
1113: * Find a segment which begins after this one does.
1114: */
1.148 matt 1115: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1116: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1117: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1118: break;
1119:
1120: /*
1121: * If there is a preceding segment, it may provide some of
1122: * our data already. If so, drop the data from the incoming
1123: * segment. If it provides all of our data, drop us.
1124: */
1.25 cgd 1125: if (p != NULL) {
1.155 itojun 1126: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1127: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1128: if (i > 0) {
1.155 itojun 1129: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1130: goto dropfrag;
1.50 thorpej 1131: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1132: ipqe->ipqe_ip->ip_off =
1133: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1134: ipqe->ipqe_ip->ip_len =
1135: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1136: }
1137: }
1138:
1139: /*
1140: * While we overlap succeeding segments trim them or,
1141: * if they are completely covered, dequeue them.
1142: */
1.155 itojun 1143: for (; q != NULL &&
1144: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1145: ntohs(q->ipqe_ip->ip_off); q = nq) {
1146: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1147: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1148: if (i < ntohs(q->ipqe_ip->ip_len)) {
1149: q->ipqe_ip->ip_len =
1150: htons(ntohs(q->ipqe_ip->ip_len) - i);
1151: q->ipqe_ip->ip_off =
1152: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1153: m_adj(q->ipqe_m, i);
1.1 cgd 1154: break;
1155: }
1.148 matt 1156: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1157: m_freem(q->ipqe_m);
1.148 matt 1158: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1159: pool_put(&ipqent_pool, q);
1.192 jonathan 1160: fp->ipq_nfrags--;
1161: ip_nfrags--;
1.1 cgd 1162: }
1163:
1164: insert:
1165: /*
1166: * Stick new segment in its place;
1167: * check for complete reassembly.
1168: */
1.25 cgd 1169: if (p == NULL) {
1.148 matt 1170: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1171: } else {
1.148 matt 1172: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1173: }
1.1 cgd 1174: next = 0;
1.148 matt 1175: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1176: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1177: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1178: return (0);
1.155 itojun 1179: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1180: }
1.25 cgd 1181: if (p->ipqe_mff)
1.1 cgd 1182: return (0);
1183:
1184: /*
1.41 thorpej 1185: * Reassembly is complete. Check for a bogus message size and
1186: * concatenate fragments.
1.1 cgd 1187: */
1.148 matt 1188: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1189: ip = q->ipqe_ip;
1.41 thorpej 1190: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1191: ipstat.ips_toolong++;
1192: ip_freef(fp);
1193: return (0);
1194: }
1.50 thorpej 1195: m = q->ipqe_m;
1.1 cgd 1196: t = m->m_next;
1197: m->m_next = 0;
1198: m_cat(m, t);
1.148 matt 1199: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1200: pool_put(&ipqent_pool, q);
1.25 cgd 1201: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1202: t = q->ipqe_m;
1.148 matt 1203: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1204: pool_put(&ipqent_pool, q);
1.1 cgd 1205: m_cat(m, t);
1206: }
1.192 jonathan 1207: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1208:
1209: /*
1210: * Create header for new ip packet by
1211: * modifying header of first packet;
1212: * dequeue and discard fragment reassembly header.
1213: * Make header visible.
1214: */
1.155 itojun 1215: ip->ip_len = htons(next);
1.25 cgd 1216: ip->ip_src = fp->ipq_src;
1217: ip->ip_dst = fp->ipq_dst;
1218: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1219: FREE(fp, M_FTABLE);
1.131 itojun 1220: ip_nfragpackets--;
1.1 cgd 1221: m->m_len += (ip->ip_hl << 2);
1222: m->m_data -= (ip->ip_hl << 2);
1223: /* some debugging cruft by sklower, below, will go away soon */
1224: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1225: int plen = 0;
1.50 thorpej 1226: for (t = m; t; t = t->m_next)
1227: plen += t->m_len;
1228: m->m_pkthdr.len = plen;
1.213 yamt 1229: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1230: }
1.50 thorpej 1231: return (m);
1.1 cgd 1232:
1233: dropfrag:
1.192 jonathan 1234: if (fp != 0)
1235: fp->ipq_nfrags--;
1236: ip_nfrags--;
1.1 cgd 1237: ipstat.ips_fragdropped++;
1238: m_freem(m);
1.72 thorpej 1239: pool_put(&ipqent_pool, ipqe);
1.1 cgd 1240: return (0);
1241: }
1242:
1243: /*
1244: * Free a fragment reassembly header and all
1245: * associated datagrams.
1246: */
1.8 mycroft 1247: void
1.211 perry 1248: ip_freef(struct ipq *fp)
1.1 cgd 1249: {
1.109 augustss 1250: struct ipqent *q, *p;
1.192 jonathan 1251: u_int nfrags = 0;
1.1 cgd 1252:
1.75 thorpej 1253: IPQ_LOCK_CHECK();
1254:
1.148 matt 1255: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1256: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1257: m_freem(q->ipqe_m);
1.192 jonathan 1258: nfrags++;
1.148 matt 1259: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1260: pool_put(&ipqent_pool, q);
1.1 cgd 1261: }
1.192 jonathan 1262:
1263: if (nfrags != fp->ipq_nfrags)
1264: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1265: ip_nfrags -= nfrags;
1.25 cgd 1266: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1267: FREE(fp, M_FTABLE);
1.131 itojun 1268: ip_nfragpackets--;
1.1 cgd 1269: }
1270:
1271: /*
1.194 jonathan 1272: * IP reassembly TTL machinery for multiplicative drop.
1273: */
1274: static u_int fragttl_histo[(IPFRAGTTL+1)];
1275:
1276:
1277: /*
1278: * Decrement TTL of all reasembly queue entries by `ticks'.
1279: * Count number of distinct fragments (as opposed to partial, fragmented
1280: * datagrams) in the reassembly queue. While we traverse the entire
1281: * reassembly queue, compute and return the median TTL over all fragments.
1282: */
1283: static u_int
1284: ip_reass_ttl_decr(u_int ticks)
1285: {
1.198 matt 1286: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1287: struct ipq *fp, *nfp;
1.198 matt 1288: int i;
1.212 perry 1289:
1.194 jonathan 1290: nfrags = 0;
1291: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1292:
1.194 jonathan 1293: for (i = 0; i < IPREASS_NHASH; i++) {
1294: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1295: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1296: 0 : fp->ipq_ttl - ticks);
1297: nfp = LIST_NEXT(fp, ipq_q);
1298: if (fp->ipq_ttl == 0) {
1299: ipstat.ips_fragtimeout++;
1300: ip_freef(fp);
1301: } else {
1302: nfrags += fp->ipq_nfrags;
1303: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1304: }
1305: }
1306: }
1307:
1308: KASSERT(ip_nfrags == nfrags);
1309:
1310: /* Find median (or other drop fraction) in histogram. */
1311: dropfraction = (ip_nfrags / 2);
1312: keepfraction = ip_nfrags - dropfraction;
1313: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1314: median += fragttl_histo[i];
1315: if (median >= keepfraction)
1316: break;
1317: }
1318:
1319: /* Return TTL of median (or other fraction). */
1320: return (u_int)i;
1321: }
1322:
1323: void
1324: ip_reass_drophalf(void)
1325: {
1326:
1327: u_int median_ticks;
1328: /*
1329: * Compute median TTL of all fragments, and count frags
1330: * with that TTL or lower (roughly half of all fragments).
1331: */
1332: median_ticks = ip_reass_ttl_decr(0);
1333:
1334: /* Drop half. */
1335: median_ticks = ip_reass_ttl_decr(median_ticks);
1336:
1337: }
1338:
1339: /*
1.1 cgd 1340: * IP timer processing;
1341: * if a timer expires on a reassembly
1342: * queue, discard it.
1343: */
1.8 mycroft 1344: void
1.211 perry 1345: ip_slowtimo(void)
1.1 cgd 1346: {
1.191 jonathan 1347: static u_int dropscanidx = 0;
1348: u_int i;
1.194 jonathan 1349: u_int median_ttl;
1.24 mycroft 1350: int s = splsoftnet();
1.1 cgd 1351:
1.75 thorpej 1352: IPQ_LOCK();
1.194 jonathan 1353:
1354: /* Age TTL of all fragments by 1 tick .*/
1355: median_ttl = ip_reass_ttl_decr(1);
1356:
1357: /* make sure fragment limit is up-to-date */
1358: CHECK_NMBCLUSTER_PARAMS();
1359:
1360: /* If we have too many fragments, drop the older half. */
1361: if (ip_nfrags > ip_maxfrags)
1362: ip_reass_ttl_decr(median_ttl);
1363:
1.131 itojun 1364: /*
1.194 jonathan 1365: * If we are over the maximum number of fragmented packets
1.131 itojun 1366: * (due to the limit being lowered), drain off
1.190 jonathan 1367: * enough to get down to the new limit. Start draining
1368: * from the reassembly hashqueue most recently drained.
1.131 itojun 1369: */
1370: if (ip_maxfragpackets < 0)
1371: ;
1372: else {
1.190 jonathan 1373: int wrapped = 0;
1374:
1375: i = dropscanidx;
1376: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1377: while (LIST_FIRST(&ipq[i]) != NULL)
1378: ip_freef(LIST_FIRST(&ipq[i]));
1379: if (++i >= IPREASS_NHASH) {
1380: i = 0;
1381: }
1382: /*
1383: * Dont scan forever even if fragment counters are
1384: * wrong: stop after scanning entire reassembly queue.
1385: */
1386: if (i == dropscanidx)
1387: wrapped = 1;
1388: }
1389: dropscanidx = i;
1.131 itojun 1390: }
1.75 thorpej 1391: IPQ_UNLOCK();
1.63 matt 1392: #ifdef GATEWAY
1393: ipflow_slowtimo();
1394: #endif
1.1 cgd 1395: splx(s);
1396: }
1397:
1398: /*
1399: * Drain off all datagram fragments.
1400: */
1.8 mycroft 1401: void
1.211 perry 1402: ip_drain(void)
1.1 cgd 1403: {
1404:
1.75 thorpej 1405: /*
1406: * We may be called from a device's interrupt context. If
1407: * the ipq is already busy, just bail out now.
1408: */
1409: if (ipq_lock_try() == 0)
1410: return;
1411:
1.194 jonathan 1412: /*
1413: * Drop half the total fragments now. If more mbufs are needed,
1414: * we will be called again soon.
1415: */
1416: ip_reass_drophalf();
1.75 thorpej 1417:
1418: IPQ_UNLOCK();
1.1 cgd 1419: }
1420:
1421: /*
1422: * Do option processing on a datagram,
1423: * possibly discarding it if bad options are encountered,
1424: * or forwarding it if source-routed.
1425: * Returns 1 if packet has been forwarded/freed,
1426: * 0 if the packet should be processed further.
1427: */
1.8 mycroft 1428: int
1.211 perry 1429: ip_dooptions(struct mbuf *m)
1.1 cgd 1430: {
1.109 augustss 1431: struct ip *ip = mtod(m, struct ip *);
1432: u_char *cp, *cp0;
1433: struct ip_timestamp *ipt;
1434: struct in_ifaddr *ia;
1.1 cgd 1435: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1436: struct in_addr dst;
1.1 cgd 1437: n_time ntime;
1438:
1.13 mycroft 1439: dst = ip->ip_dst;
1.1 cgd 1440: cp = (u_char *)(ip + 1);
1441: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1442: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1443: opt = cp[IPOPT_OPTVAL];
1444: if (opt == IPOPT_EOL)
1445: break;
1446: if (opt == IPOPT_NOP)
1447: optlen = 1;
1448: else {
1.113 itojun 1449: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1450: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1451: goto bad;
1452: }
1.1 cgd 1453: optlen = cp[IPOPT_OLEN];
1.114 itojun 1454: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1455: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1456: goto bad;
1457: }
1458: }
1459: switch (opt) {
1460:
1461: default:
1462: break;
1463:
1464: /*
1465: * Source routing with record.
1466: * Find interface with current destination address.
1467: * If none on this machine then drop if strictly routed,
1468: * or do nothing if loosely routed.
1469: * Record interface address and bring up next address
1470: * component. If strictly routed make sure next
1471: * address is on directly accessible net.
1472: */
1473: case IPOPT_LSRR:
1474: case IPOPT_SSRR:
1.47 cjs 1475: if (ip_allowsrcrt == 0) {
1476: type = ICMP_UNREACH;
1477: code = ICMP_UNREACH_NET_PROHIB;
1478: goto bad;
1479: }
1.114 itojun 1480: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1481: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1482: goto bad;
1483: }
1.1 cgd 1484: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1485: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1486: goto bad;
1487: }
1488: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1489: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1490: if (ia == 0) {
1491: if (opt == IPOPT_SSRR) {
1492: type = ICMP_UNREACH;
1493: code = ICMP_UNREACH_SRCFAIL;
1494: goto bad;
1495: }
1496: /*
1497: * Loose routing, and not at next destination
1498: * yet; nothing to do except forward.
1499: */
1500: break;
1501: }
1502: off--; /* 0 origin */
1.112 sommerfe 1503: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1504: /*
1505: * End of source route. Should be for us.
1506: */
1507: save_rte(cp, ip->ip_src);
1508: break;
1509: }
1510: /*
1511: * locate outgoing interface
1512: */
1513: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1514: sizeof(ipaddr.sin_addr));
1.96 thorpej 1515: if (opt == IPOPT_SSRR)
1.196 itojun 1516: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1517: else
1.1 cgd 1518: ia = ip_rtaddr(ipaddr.sin_addr);
1519: if (ia == 0) {
1520: type = ICMP_UNREACH;
1521: code = ICMP_UNREACH_SRCFAIL;
1522: goto bad;
1523: }
1524: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1525: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1526: (caddr_t)(cp + off), sizeof(struct in_addr));
1527: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1528: /*
1529: * Let ip_intr's mcast routing check handle mcast pkts
1530: */
1.18 mycroft 1531: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1532: break;
1533:
1534: case IPOPT_RR:
1.114 itojun 1535: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1536: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1537: goto bad;
1538: }
1.1 cgd 1539: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1540: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1541: goto bad;
1542: }
1543: /*
1544: * If no space remains, ignore.
1545: */
1546: off--; /* 0 origin */
1.112 sommerfe 1547: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1548: break;
1549: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1550: sizeof(ipaddr.sin_addr));
1551: /*
1552: * locate outgoing interface; if we're the destination,
1553: * use the incoming interface (should be same).
1554: */
1.96 thorpej 1555: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1556: == NULL &&
1557: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1558: type = ICMP_UNREACH;
1559: code = ICMP_UNREACH_HOST;
1560: goto bad;
1561: }
1.20 mycroft 1562: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1563: (caddr_t)(cp + off), sizeof(struct in_addr));
1564: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1565: break;
1566:
1567: case IPOPT_TS:
1568: code = cp - (u_char *)ip;
1569: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1570: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1571: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1572: goto bad;
1.114 itojun 1573: }
1574: if (ipt->ipt_ptr < 5) {
1575: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1576: goto bad;
1577: }
1.15 cgd 1578: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1579: if (++ipt->ipt_oflw == 0) {
1580: code = (u_char *)&ipt->ipt_ptr -
1581: (u_char *)ip;
1.1 cgd 1582: goto bad;
1.114 itojun 1583: }
1.1 cgd 1584: break;
1585: }
1.104 thorpej 1586: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1587: switch (ipt->ipt_flg) {
1588:
1589: case IPOPT_TS_TSONLY:
1590: break;
1591:
1592: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1593: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1594: sizeof(struct in_addr) > ipt->ipt_len) {
1595: code = (u_char *)&ipt->ipt_ptr -
1596: (u_char *)ip;
1.1 cgd 1597: goto bad;
1.114 itojun 1598: }
1.13 mycroft 1599: ipaddr.sin_addr = dst;
1.96 thorpej 1600: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1601: m->m_pkthdr.rcvif));
1.13 mycroft 1602: if (ia == 0)
1603: continue;
1.104 thorpej 1604: bcopy(&ia->ia_addr.sin_addr,
1605: cp0, sizeof(struct in_addr));
1.1 cgd 1606: ipt->ipt_ptr += sizeof(struct in_addr);
1607: break;
1608:
1609: case IPOPT_TS_PRESPEC:
1.66 thorpej 1610: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1611: sizeof(struct in_addr) > ipt->ipt_len) {
1612: code = (u_char *)&ipt->ipt_ptr -
1613: (u_char *)ip;
1.1 cgd 1614: goto bad;
1.114 itojun 1615: }
1.104 thorpej 1616: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1617: sizeof(struct in_addr));
1.96 thorpej 1618: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1619: == NULL)
1.1 cgd 1620: continue;
1621: ipt->ipt_ptr += sizeof(struct in_addr);
1622: break;
1623:
1624: default:
1.114 itojun 1625: /* XXX can't take &ipt->ipt_flg */
1626: code = (u_char *)&ipt->ipt_ptr -
1627: (u_char *)ip + 1;
1.1 cgd 1628: goto bad;
1629: }
1630: ntime = iptime();
1.107 thorpej 1631: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1632: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1633: sizeof(n_time));
1634: ipt->ipt_ptr += sizeof(n_time);
1635: }
1636: }
1637: if (forward) {
1.26 thorpej 1638: if (ip_forwsrcrt == 0) {
1639: type = ICMP_UNREACH;
1640: code = ICMP_UNREACH_SRCFAIL;
1641: goto bad;
1642: }
1.1 cgd 1643: ip_forward(m, 1);
1644: return (1);
1.13 mycroft 1645: }
1646: return (0);
1.1 cgd 1647: bad:
1.13 mycroft 1648: icmp_error(m, type, code, 0, 0);
1649: ipstat.ips_badoptions++;
1.1 cgd 1650: return (1);
1651: }
1652:
1653: /*
1654: * Given address of next destination (final or next hop),
1655: * return internet address info of interface to be used to get there.
1656: */
1657: struct in_ifaddr *
1.211 perry 1658: ip_rtaddr(struct in_addr dst)
1.1 cgd 1659: {
1.109 augustss 1660: struct sockaddr_in *sin;
1.1 cgd 1661:
1.19 mycroft 1662: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1663:
1.35 mycroft 1664: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1665: if (ipforward_rt.ro_rt) {
1666: RTFREE(ipforward_rt.ro_rt);
1667: ipforward_rt.ro_rt = 0;
1668: }
1669: sin->sin_family = AF_INET;
1670: sin->sin_len = sizeof(*sin);
1671: sin->sin_addr = dst;
1672:
1673: rtalloc(&ipforward_rt);
1674: }
1675: if (ipforward_rt.ro_rt == 0)
1676: return ((struct in_ifaddr *)0);
1.19 mycroft 1677: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1678: }
1679:
1680: /*
1681: * Save incoming source route for use in replies,
1682: * to be picked up later by ip_srcroute if the receiver is interested.
1683: */
1.13 mycroft 1684: void
1.211 perry 1685: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1686: {
1687: unsigned olen;
1688:
1689: olen = option[IPOPT_OLEN];
1690: #ifdef DIAGNOSTIC
1691: if (ipprintfs)
1.39 christos 1692: printf("save_rte: olen %d\n", olen);
1.89 itojun 1693: #endif /* 0 */
1.1 cgd 1694: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1695: return;
1696: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1697: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1698: ip_srcrt.dst = dst;
1699: }
1700:
1701: /*
1702: * Retrieve incoming source route for use in replies,
1703: * in the same form used by setsockopt.
1704: * The first hop is placed before the options, will be removed later.
1705: */
1706: struct mbuf *
1.211 perry 1707: ip_srcroute(void)
1.1 cgd 1708: {
1.109 augustss 1709: struct in_addr *p, *q;
1710: struct mbuf *m;
1.1 cgd 1711:
1712: if (ip_nhops == 0)
1713: return ((struct mbuf *)0);
1714: m = m_get(M_DONTWAIT, MT_SOOPTS);
1715: if (m == 0)
1716: return ((struct mbuf *)0);
1717:
1.164 matt 1718: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1719: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1720:
1721: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1722: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1723: OPTSIZ;
1724: #ifdef DIAGNOSTIC
1725: if (ipprintfs)
1.39 christos 1726: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1727: #endif
1728:
1729: /*
1730: * First save first hop for return route
1731: */
1732: p = &ip_srcrt.route[ip_nhops - 1];
1733: *(mtod(m, struct in_addr *)) = *p--;
1734: #ifdef DIAGNOSTIC
1735: if (ipprintfs)
1.39 christos 1736: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1737: #endif
1738:
1739: /*
1740: * Copy option fields and padding (nop) to mbuf.
1741: */
1742: ip_srcrt.nop = IPOPT_NOP;
1743: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1744: bcopy((caddr_t)&ip_srcrt.nop,
1745: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1746: q = (struct in_addr *)(mtod(m, caddr_t) +
1747: sizeof(struct in_addr) + OPTSIZ);
1748: #undef OPTSIZ
1749: /*
1750: * Record return path as an IP source route,
1751: * reversing the path (pointers are now aligned).
1752: */
1753: while (p >= ip_srcrt.route) {
1754: #ifdef DIAGNOSTIC
1755: if (ipprintfs)
1.39 christos 1756: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1757: #endif
1758: *q++ = *p--;
1759: }
1760: /*
1761: * Last hop goes to final destination.
1762: */
1763: *q = ip_srcrt.dst;
1764: #ifdef DIAGNOSTIC
1765: if (ipprintfs)
1.39 christos 1766: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1767: #endif
1768: return (m);
1769: }
1770:
1771: /*
1772: * Strip out IP options, at higher
1773: * level protocol in the kernel.
1774: * Second argument is buffer to which options
1775: * will be moved, and return value is their length.
1776: * XXX should be deleted; last arg currently ignored.
1777: */
1.8 mycroft 1778: void
1.211 perry 1779: ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
1.1 cgd 1780: {
1.109 augustss 1781: int i;
1.1 cgd 1782: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1783: caddr_t opts;
1.1 cgd 1784: int olen;
1785:
1.79 mycroft 1786: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1787: opts = (caddr_t)(ip + 1);
1788: i = m->m_len - (sizeof (struct ip) + olen);
1789: bcopy(opts + olen, opts, (unsigned)i);
1790: m->m_len -= olen;
1791: if (m->m_flags & M_PKTHDR)
1792: m->m_pkthdr.len -= olen;
1.155 itojun 1793: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79 mycroft 1794: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1795: }
1796:
1.139 matt 1797: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1798: 0, 0, 0, 0,
1799: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1800: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1801: EMSGSIZE, EHOSTUNREACH, 0, 0,
1802: 0, 0, 0, 0,
1803: ENOPROTOOPT
1804: };
1805:
1806: /*
1807: * Forward a packet. If some error occurs return the sender
1808: * an icmp packet. Note we can't always generate a meaningful
1809: * icmp message because icmp doesn't have a large enough repertoire
1810: * of codes and types.
1811: *
1812: * If not forwarding, just drop the packet. This could be confusing
1813: * if ipforwarding was zero but some routing protocol was advancing
1814: * us as a gateway to somewhere. However, we must let the routing
1815: * protocol deal with that.
1816: *
1817: * The srcrt parameter indicates whether the packet is being forwarded
1818: * via a source route.
1819: */
1.13 mycroft 1820: void
1.211 perry 1821: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1822: {
1.109 augustss 1823: struct ip *ip = mtod(m, struct ip *);
1824: struct sockaddr_in *sin;
1825: struct rtentry *rt;
1.220 christos 1826: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1827: struct mbuf *mcopy;
1.13 mycroft 1828: n_long dest;
1.164 matt 1829:
1830: /*
1831: * We are now in the output path.
1832: */
1833: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1834:
1835: /*
1836: * Clear any in-bound checksum flags for this packet.
1837: */
1838: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1839:
1.13 mycroft 1840: dest = 0;
1.1 cgd 1841: #ifdef DIAGNOSTIC
1842: if (ipprintfs)
1.70 thorpej 1843: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1844: ntohl(ip->ip_src.s_addr),
1845: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1846: #endif
1.93 sommerfe 1847: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1848: ipstat.ips_cantforward++;
1849: m_freem(m);
1850: return;
1851: }
1852: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1853: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1854: return;
1855: }
1856:
1.19 mycroft 1857: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1858: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1859: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1860: if (ipforward_rt.ro_rt) {
1861: RTFREE(ipforward_rt.ro_rt);
1862: ipforward_rt.ro_rt = 0;
1863: }
1864: sin->sin_family = AF_INET;
1.35 mycroft 1865: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1866: sin->sin_addr = ip->ip_dst;
1867:
1868: rtalloc(&ipforward_rt);
1869: if (ipforward_rt.ro_rt == 0) {
1.218 seanb 1870: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.1 cgd 1871: return;
1872: }
1873: rt = ipforward_rt.ro_rt;
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 &&
1.35 mycroft 1897: !in_nullhost(satosin(rt_key(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:
1.27 thorpej 1920: error = ip_output(m, (struct mbuf *)0, &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)
1925: ipstat.ips_cantforward++;
1926: else {
1927: ipstat.ips_forward++;
1928: if (type)
1929: ipstat.ips_redirectsent++;
1930: else {
1.63 matt 1931: if (mcopy) {
1932: #ifdef GATEWAY
1.64 thorpej 1933: if (mcopy->m_flags & M_CANFASTFWD)
1934: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1935: #endif
1.1 cgd 1936: m_freem(mcopy);
1.63 matt 1937: }
1.1 cgd 1938: return;
1939: }
1940: }
1941: if (mcopy == NULL)
1942: return;
1.13 mycroft 1943:
1.1 cgd 1944: switch (error) {
1945:
1946: case 0: /* forwarded, but need redirect */
1947: /* type, code set above */
1948: break;
1949:
1950: case ENETUNREACH: /* shouldn't happen, checked above */
1951: case EHOSTUNREACH:
1952: case ENETDOWN:
1953: case EHOSTDOWN:
1954: default:
1955: type = ICMP_UNREACH;
1956: code = ICMP_UNREACH_HOST;
1957: break;
1958:
1959: case EMSGSIZE:
1960: type = ICMP_UNREACH;
1961: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1962: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13 mycroft 1963: if (ipforward_rt.ro_rt)
1.220 christos 1964: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1965: #else
1966: /*
1967: * If the packet is routed over IPsec tunnel, tell the
1968: * originator the tunnel MTU.
1969: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1970: * XXX quickhack!!!
1971: */
1972: if (ipforward_rt.ro_rt) {
1973: struct secpolicy *sp;
1974: int ipsecerror;
1.95 itojun 1975: size_t ipsechdr;
1.89 itojun 1976: struct route *ro;
1977:
1978: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1979: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1980: &ipsecerror);
1.89 itojun 1981:
1982: if (sp == NULL)
1.220 christos 1983: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1984: else {
1985: /* count IPsec header size */
1.95 itojun 1986: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1987: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1988:
1989: /*
1990: * find the correct route for outer IPv4
1991: * header, compute tunnel MTU.
1992: */
1.220 christos 1993:
1.89 itojun 1994: if (sp->req != NULL
1.95 itojun 1995: && sp->req->sav != NULL
1996: && sp->req->sav->sah != NULL) {
1997: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1998: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1.220 christos 1999: destmtu =
1.151 itojun 2000: ro->ro_rt->rt_rmx.rmx_mtu ?
2001: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 2002: ro->ro_rt->rt_ifp->if_mtu;
1.220 christos 2003: destmtu -= ipsechdr;
1.89 itojun 2004: }
2005: }
2006:
1.173 jonathan 2007: #ifdef IPSEC
1.89 itojun 2008: key_freesp(sp);
1.173 jonathan 2009: #else
2010: KEY_FREESP(&sp);
2011: #endif
1.89 itojun 2012: }
2013: }
2014: #endif /*IPSEC*/
1.1 cgd 2015: ipstat.ips_cantfrag++;
2016: break;
2017:
2018: case ENOBUFS:
1.143 itojun 2019: #if 1
2020: /*
2021: * a router should not generate ICMP_SOURCEQUENCH as
2022: * required in RFC1812 Requirements for IP Version 4 Routers.
2023: * source quench could be a big problem under DoS attacks,
1.149 wiz 2024: * or if the underlying interface is rate-limited.
1.143 itojun 2025: */
2026: if (mcopy)
2027: m_freem(mcopy);
2028: return;
2029: #else
1.1 cgd 2030: type = ICMP_SOURCEQUENCH;
2031: code = 0;
2032: break;
1.143 itojun 2033: #endif
1.1 cgd 2034: }
1.220 christos 2035: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2036: }
2037:
2038: void
1.211 perry 2039: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2040: struct mbuf *m)
1.44 thorpej 2041: {
2042:
2043: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2044: struct timeval tv;
2045:
2046: microtime(&tv);
2047: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
2048: SCM_TIMESTAMP, SOL_SOCKET);
2049: if (*mp)
2050: mp = &(*mp)->m_next;
2051: }
2052: if (inp->inp_flags & INP_RECVDSTADDR) {
2053: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2054: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2055: if (*mp)
2056: mp = &(*mp)->m_next;
2057: }
2058: #ifdef notyet
2059: /*
2060: * XXX
2061: * Moving these out of udp_input() made them even more broken
2062: * than they already were.
2063: * - fenner@parc.xerox.com
2064: */
2065: /* options were tossed already */
2066: if (inp->inp_flags & INP_RECVOPTS) {
2067: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2068: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2069: if (*mp)
2070: mp = &(*mp)->m_next;
2071: }
2072: /* ip_srcroute doesn't do what we want here, need to fix */
2073: if (inp->inp_flags & INP_RECVRETOPTS) {
2074: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2075: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2076: if (*mp)
2077: mp = &(*mp)->m_next;
2078: }
2079: #endif
2080: if (inp->inp_flags & INP_RECVIF) {
2081: struct sockaddr_dl sdl;
2082:
2083: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
2084: sdl.sdl_family = AF_LINK;
2085: sdl.sdl_index = m->m_pkthdr.rcvif ?
2086: m->m_pkthdr.rcvif->if_index : 0;
2087: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
2088: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
2089: IP_RECVIF, IPPROTO_IP);
2090: if (*mp)
2091: mp = &(*mp)->m_next;
2092: }
1.13 mycroft 2093: }
2094:
1.189 atatat 2095: /*
2096: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2097: * range of the new value and tweaks timers if it changes.
2098: */
2099: static int
2100: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2101: {
1.189 atatat 2102: int error, tmp;
2103: struct sysctlnode node;
2104:
2105: node = *rnode;
2106: tmp = ip_mtudisc_timeout;
2107: node.sysctl_data = &tmp;
2108: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2109: if (error || newp == NULL)
2110: return (error);
2111: if (tmp < 0)
2112: return (EINVAL);
1.52 thorpej 2113:
1.189 atatat 2114: ip_mtudisc_timeout = tmp;
2115: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2116:
2117: return (0);
2118: }
1.54 lukem 2119:
1.65 matt 2120: #ifdef GATEWAY
1.189 atatat 2121: /*
2122: * sysctl helper routine for net.inet.ip.maxflows. apparently if
2123: * maxflows is even looked up, we "reap flows".
2124: */
2125: static int
2126: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2127: {
2128: int s;
1.67 thorpej 2129:
1.217 atatat 2130: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.189 atatat 2131: if (s)
2132: return (s);
1.212 perry 2133:
1.189 atatat 2134: s = splsoftnet();
2135: ipflow_reap(0);
2136: splx(s);
1.144 martin 2137:
1.189 atatat 2138: return (0);
2139: }
2140: #endif /* GATEWAY */
1.117 tron 2141:
1.131 itojun 2142:
1.189 atatat 2143: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2144: {
2145: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2146:
1.197 atatat 2147: sysctl_createv(clog, 0, NULL, NULL,
2148: CTLFLAG_PERMANENT,
1.189 atatat 2149: CTLTYPE_NODE, "net", NULL,
2150: NULL, 0, NULL, 0,
2151: CTL_NET, CTL_EOL);
1.197 atatat 2152: sysctl_createv(clog, 0, NULL, NULL,
2153: CTLFLAG_PERMANENT,
1.203 atatat 2154: CTLTYPE_NODE, "inet",
2155: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2156: NULL, 0, NULL, 0,
2157: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2158: sysctl_createv(clog, 0, NULL, NULL,
2159: CTLFLAG_PERMANENT,
1.203 atatat 2160: CTLTYPE_NODE, "ip",
2161: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2162: NULL, 0, NULL, 0,
2163: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2164:
1.197 atatat 2165: sysctl_createv(clog, 0, NULL, NULL,
2166: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2167: CTLTYPE_INT, "forwarding",
2168: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2169: NULL, 0, &ipforwarding, 0,
2170: CTL_NET, PF_INET, IPPROTO_IP,
2171: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2172: sysctl_createv(clog, 0, NULL, NULL,
2173: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2174: CTLTYPE_INT, "redirect",
2175: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2176: NULL, 0, &ipsendredirects, 0,
2177: CTL_NET, PF_INET, IPPROTO_IP,
2178: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2179: sysctl_createv(clog, 0, NULL, NULL,
2180: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2181: CTLTYPE_INT, "ttl",
2182: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2183: NULL, 0, &ip_defttl, 0,
2184: CTL_NET, PF_INET, IPPROTO_IP,
2185: IPCTL_DEFTTL, CTL_EOL);
2186: #ifdef IPCTL_DEFMTU
1.197 atatat 2187: sysctl_createv(clog, 0, NULL, NULL,
2188: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2189: CTLTYPE_INT, "mtu",
2190: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2191: NULL, 0, &ip_mtu, 0,
2192: CTL_NET, PF_INET, IPPROTO_IP,
2193: IPCTL_DEFMTU, CTL_EOL);
2194: #endif /* IPCTL_DEFMTU */
1.197 atatat 2195: sysctl_createv(clog, 0, NULL, NULL,
2196: CTLFLAG_PERMANENT|CTLFLAG_READONLY1,
1.203 atatat 2197: CTLTYPE_INT, "forwsrcrt",
2198: SYSCTL_DESCR("Enable forwarding of source-routed "
2199: "datagrams"),
1.189 atatat 2200: NULL, 0, &ip_forwsrcrt, 0,
2201: CTL_NET, PF_INET, IPPROTO_IP,
2202: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2203: sysctl_createv(clog, 0, NULL, NULL,
2204: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2205: CTLTYPE_INT, "directed-broadcast",
2206: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2207: NULL, 0, &ip_directedbcast, 0,
2208: CTL_NET, PF_INET, IPPROTO_IP,
2209: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2210: sysctl_createv(clog, 0, NULL, NULL,
2211: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2212: CTLTYPE_INT, "allowsrcrt",
2213: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2214: NULL, 0, &ip_allowsrcrt, 0,
2215: CTL_NET, PF_INET, IPPROTO_IP,
2216: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2217: sysctl_createv(clog, 0, NULL, NULL,
2218: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2219: CTLTYPE_INT, "subnetsarelocal",
2220: SYSCTL_DESCR("Whether logical subnets are considered "
2221: "local"),
1.189 atatat 2222: NULL, 0, &subnetsarelocal, 0,
2223: CTL_NET, PF_INET, IPPROTO_IP,
2224: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2225: sysctl_createv(clog, 0, NULL, NULL,
2226: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2227: CTLTYPE_INT, "mtudisc",
2228: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2229: NULL, 0, &ip_mtudisc, 0,
2230: CTL_NET, PF_INET, IPPROTO_IP,
2231: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2232: sysctl_createv(clog, 0, NULL, NULL,
2233: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2234: CTLTYPE_INT, "anonportmin",
2235: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2236: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2237: CTL_NET, PF_INET, IPPROTO_IP,
2238: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2239: sysctl_createv(clog, 0, NULL, NULL,
2240: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2241: CTLTYPE_INT, "anonportmax",
2242: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2243: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2244: CTL_NET, PF_INET, IPPROTO_IP,
2245: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2246: sysctl_createv(clog, 0, NULL, NULL,
2247: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2248: CTLTYPE_INT, "mtudisctimeout",
2249: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2250: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2251: CTL_NET, PF_INET, IPPROTO_IP,
2252: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2253: #ifdef GATEWAY
1.197 atatat 2254: sysctl_createv(clog, 0, NULL, NULL,
2255: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2256: CTLTYPE_INT, "maxflows",
2257: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2258: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2259: CTL_NET, PF_INET, IPPROTO_IP,
2260: IPCTL_MAXFLOWS, CTL_EOL);
2261: #endif /* GATEWAY */
1.197 atatat 2262: sysctl_createv(clog, 0, NULL, NULL,
2263: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2264: CTLTYPE_INT, "hostzerobroadcast",
2265: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2266: NULL, 0, &hostzeroisbroadcast, 0,
2267: CTL_NET, PF_INET, IPPROTO_IP,
2268: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2269: #if NGIF > 0
1.197 atatat 2270: sysctl_createv(clog, 0, NULL, NULL,
2271: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2272: CTLTYPE_INT, "gifttl",
2273: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2274: NULL, 0, &ip_gif_ttl, 0,
2275: CTL_NET, PF_INET, IPPROTO_IP,
2276: IPCTL_GIF_TTL, CTL_EOL);
2277: #endif /* NGIF */
2278: #ifndef IPNOPRIVPORTS
1.197 atatat 2279: sysctl_createv(clog, 0, NULL, NULL,
2280: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2281: CTLTYPE_INT, "lowportmin",
2282: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2283: "to assign"),
1.189 atatat 2284: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2285: CTL_NET, PF_INET, IPPROTO_IP,
2286: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2287: sysctl_createv(clog, 0, NULL, NULL,
2288: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2289: CTLTYPE_INT, "lowportmax",
2290: SYSCTL_DESCR("Highest privileged ephemeral port number "
2291: "to assign"),
1.189 atatat 2292: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2293: CTL_NET, PF_INET, IPPROTO_IP,
2294: IPCTL_LOWPORTMAX, CTL_EOL);
2295: #endif /* IPNOPRIVPORTS */
1.197 atatat 2296: sysctl_createv(clog, 0, NULL, NULL,
2297: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2298: CTLTYPE_INT, "maxfragpackets",
2299: SYSCTL_DESCR("Maximum number of fragments to retain for "
2300: "possible reassembly"),
1.189 atatat 2301: NULL, 0, &ip_maxfragpackets, 0,
2302: CTL_NET, PF_INET, IPPROTO_IP,
2303: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2304: #if NGRE > 0
1.197 atatat 2305: sysctl_createv(clog, 0, NULL, NULL,
2306: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2307: CTLTYPE_INT, "grettl",
2308: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2309: NULL, 0, &ip_gre_ttl, 0,
2310: CTL_NET, PF_INET, IPPROTO_IP,
2311: IPCTL_GRE_TTL, CTL_EOL);
2312: #endif /* NGRE */
1.197 atatat 2313: sysctl_createv(clog, 0, NULL, NULL,
2314: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2315: CTLTYPE_INT, "checkinterface",
2316: SYSCTL_DESCR("Enable receive side of Strong ES model "
2317: "from RFC1122"),
1.189 atatat 2318: NULL, 0, &ip_checkinterface, 0,
2319: CTL_NET, PF_INET, IPPROTO_IP,
2320: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2321: sysctl_createv(clog, 0, NULL, NULL,
2322: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2323: CTLTYPE_INT, "random_id",
2324: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2325: NULL, 0, &ip_do_randomid, 0,
2326: CTL_NET, PF_INET, IPPROTO_IP,
2327: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2328: sysctl_createv(clog, 0, NULL, NULL,
2329: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2330: CTLTYPE_INT, "do_loopback_cksum",
2331: SYSCTL_DESCR("Perform IP checksum on loopback"),
2332: NULL, 0, &ip_do_loopback_cksum, 0,
2333: CTL_NET, PF_INET, IPPROTO_IP,
2334: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2335: sysctl_createv(clog, 0, NULL, NULL,
2336: CTLFLAG_PERMANENT,
2337: CTLTYPE_STRUCT, "stats",
2338: SYSCTL_DESCR("IP statistics"),
2339: NULL, 0, &ipstat, sizeof(ipstat),
2340: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2341: CTL_EOL);
1.1 cgd 2342: }
CVSweb <webmaster@jp.NetBSD.org>