Annotation of src/sys/netinet/ip_input.c, Revision 1.230
1.230 ! elad 1: /* $NetBSD: ip_input.c,v 1.229 2006/08/30 18:55:09 christos 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>
1.230 ! elad 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.229 2006/08/30 18:55:09 christos 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:
1.200 simonb 337: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL);
338: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL);
1.72 thorpej 339:
1.135 thorpej 340: #ifdef INET_CSUM_COUNTERS
341: #include <sys/device.h>
342:
343: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
344: NULL, "inet", "hwcsum bad");
345: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
346: NULL, "inet", "hwcsum ok");
347: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
348: NULL, "inet", "swcsum");
349:
350: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
351:
1.201 matt 352: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
353: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
354: EVCNT_ATTACH_STATIC(ip_swcsum);
355:
1.135 thorpej 356: #else
357:
358: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
359:
360: #endif /* INET_CSUM_COUNTERS */
361:
1.1 cgd 362: /*
363: * We need to save the IP options in case a protocol wants to respond
364: * to an incoming packet over the same route if the packet got here
365: * using IP source routing. This allows connection establishment and
366: * maintenance when the remote end is on a network that is not known
367: * to us.
368: */
369: int ip_nhops = 0;
370: static struct ip_srcrt {
371: struct in_addr dst; /* final destination */
372: char nop; /* one NOP to align */
373: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
374: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
375: } ip_srcrt;
376:
1.210 perry 377: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 378:
1.164 matt 379: #ifdef MBUFTRACE
380: struct mowner ip_rx_mowner = { "internet", "rx" };
381: struct mowner ip_tx_mowner = { "internet", "tx" };
382: #endif
383:
1.1 cgd 384: /*
1.194 jonathan 385: * Compute IP limits derived from the value of nmbclusters.
386: */
387: static void
388: ip_nmbclusters_changed(void)
389: {
390: ip_maxfrags = nmbclusters / 4;
391: ip_nmbclusters = nmbclusters;
392: }
393:
394: /*
1.1 cgd 395: * IP initialization: fill in IP protocol switch table.
396: * All protocols not implemented in kernel go to raw IP protocol handler.
397: */
1.8 mycroft 398: void
1.211 perry 399: ip_init(void)
1.1 cgd 400: {
1.199 matt 401: const struct protosw *pr;
1.109 augustss 402: int i;
1.1 cgd 403:
404: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
405: if (pr == 0)
406: panic("ip_init");
407: for (i = 0; i < IPPROTO_MAX; i++)
408: ip_protox[i] = pr - inetsw;
409: for (pr = inetdomain.dom_protosw;
410: pr < inetdomain.dom_protoswNPROTOSW; pr++)
411: if (pr->pr_domain->dom_family == PF_INET &&
412: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
413: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 414:
1.190 jonathan 415: for (i = 0; i < IPREASS_NHASH; i++)
416: LIST_INIT(&ipq[i]);
417:
1.227 kardel 418: ip_id = time_second & 0xfffff;
1.194 jonathan 419:
1.1 cgd 420: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 421: ip_nmbclusters_changed();
422:
1.181 jonathan 423: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 424: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
425: M_WAITOK, &in_ifaddrhash);
1.166 matt 426: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
427: M_WAITOK, &in_multihash);
1.160 itojun 428: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 429: #ifdef GATEWAY
430: ipflow_init();
431: #endif
1.121 thorpej 432:
433: #ifdef PFIL_HOOKS
434: /* Register our Packet Filter hook. */
1.126 thorpej 435: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
436: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 437: i = pfil_head_register(&inet_pfil_hook);
438: if (i != 0)
439: printf("ip_init: WARNING: unable to register pfil hook, "
440: "error %d\n", i);
441: #endif /* PFIL_HOOKS */
1.135 thorpej 442:
1.164 matt 443: #ifdef MBUFTRACE
444: MOWNER_ATTACH(&ip_tx_mowner);
445: MOWNER_ATTACH(&ip_rx_mowner);
446: #endif /* MBUFTRACE */
1.1 cgd 447: }
448:
1.229 christos 449: struct sockaddr_in ipaddr = {
450: .sin_len = sizeof(ipaddr),
451: .sin_family = AF_INET,
452: };
1.1 cgd 453: struct route ipforward_rt;
454:
455: /*
1.89 itojun 456: * IP software interrupt routine
457: */
458: void
1.211 perry 459: ipintr(void)
1.89 itojun 460: {
461: int s;
462: struct mbuf *m;
463:
464: while (1) {
1.132 thorpej 465: s = splnet();
1.89 itojun 466: IF_DEQUEUE(&ipintrq, m);
467: splx(s);
468: if (m == 0)
469: return;
1.164 matt 470: MCLAIM(m, &ip_rx_mowner);
1.89 itojun 471: ip_input(m);
472: }
473: }
474:
475: /*
1.1 cgd 476: * Ip input routine. Checksum and byte swap header. If fragmented
477: * try to reassemble. Process options. Pass to next level.
478: */
1.8 mycroft 479: void
1.89 itojun 480: ip_input(struct mbuf *m)
1.1 cgd 481: {
1.109 augustss 482: struct ip *ip = NULL;
483: struct ipq *fp;
484: struct in_ifaddr *ia;
485: struct ifaddr *ifa;
1.25 cgd 486: struct ipqent *ipqe;
1.89 itojun 487: int hlen = 0, mff, len;
1.100 itojun 488: int downmatch;
1.165 christos 489: int checkif;
1.169 itojun 490: int srcrt = 0;
1.190 jonathan 491: u_int hash;
1.173 jonathan 492: #ifdef FAST_IPSEC
493: struct m_tag *mtag;
494: struct tdb_ident *tdbi;
495: struct secpolicy *sp;
496: int s, error;
497: #endif /* FAST_IPSEC */
1.1 cgd 498:
1.164 matt 499: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 500: #ifdef DIAGNOSTIC
501: if ((m->m_flags & M_PKTHDR) == 0)
502: panic("ipintr no HDR");
1.89 itojun 503: #endif
1.164 matt 504:
1.1 cgd 505: /*
506: * If no IP addresses have been set yet but the interfaces
507: * are receiving, can't do anything with incoming packets yet.
508: */
1.181 jonathan 509: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 510: goto bad;
511: ipstat.ips_total++;
1.154 thorpej 512: /*
513: * If the IP header is not aligned, slurp it up into a new
514: * mbuf with space for link headers, in the event we forward
515: * it. Otherwise, if it is aligned, make sure the entire
516: * base IP header is in the first mbuf of the chain.
517: */
518: if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
519: if ((m = m_copyup(m, sizeof(struct ip),
520: (max_linkhdr + 3) & ~3)) == NULL) {
521: /* XXXJRT new stat, please */
522: ipstat.ips_toosmall++;
523: return;
524: }
525: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
526: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
527: ipstat.ips_toosmall++;
528: return;
529: }
1.1 cgd 530: }
531: ip = mtod(m, struct ip *);
1.13 mycroft 532: if (ip->ip_v != IPVERSION) {
533: ipstat.ips_badvers++;
534: goto bad;
535: }
1.1 cgd 536: hlen = ip->ip_hl << 2;
537: if (hlen < sizeof(struct ip)) { /* minimum header length */
538: ipstat.ips_badhlen++;
539: goto bad;
540: }
541: if (hlen > m->m_len) {
542: if ((m = m_pullup(m, hlen)) == 0) {
543: ipstat.ips_badhlen++;
1.89 itojun 544: return;
1.1 cgd 545: }
546: ip = mtod(m, struct ip *);
547: }
1.98 thorpej 548:
1.85 hwr 549: /*
1.99 thorpej 550: * RFC1122: packets with a multicast source address are
1.98 thorpej 551: * not allowed.
1.85 hwr 552: */
553: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 554: ipstat.ips_badaddr++;
1.85 hwr 555: goto bad;
1.129 itojun 556: }
557:
558: /* 127/8 must not appear on wire - RFC1122 */
559: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
560: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 561: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
562: ipstat.ips_badaddr++;
1.129 itojun 563: goto bad;
1.130 itojun 564: }
1.85 hwr 565: }
566:
1.135 thorpej 567: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 568: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 569: M_CSUM_IPv4_BAD)) {
570: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
571: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
572: goto badcsum;
573:
574: case M_CSUM_IPv4:
575: /* Checksum was okay. */
576: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
577: break;
578:
579: default:
1.206 thorpej 580: /*
581: * Must compute it ourselves. Maybe skip checksum on
582: * loopback interfaces.
583: */
584: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
585: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
586: INET_CSUM_COUNTER_INCR(&ip_swcsum);
587: if (in_cksum(m, hlen) != 0)
588: goto badcsum;
589: }
1.135 thorpej 590: break;
1.1 cgd 591: }
592:
1.121 thorpej 593: /* Retrieve the packet length. */
594: len = ntohs(ip->ip_len);
1.81 proff 595:
596: /*
597: * Check for additional length bogosity
598: */
1.84 proff 599: if (len < hlen) {
1.81 proff 600: ipstat.ips_badlen++;
601: goto bad;
602: }
1.1 cgd 603:
604: /*
605: * Check that the amount of data in the buffers
606: * is as at least much as the IP header would have us expect.
607: * Trim mbufs if longer than we expect.
608: * Drop packet if shorter than we expect.
609: */
1.35 mycroft 610: if (m->m_pkthdr.len < len) {
1.1 cgd 611: ipstat.ips_tooshort++;
612: goto bad;
613: }
1.35 mycroft 614: if (m->m_pkthdr.len > len) {
1.1 cgd 615: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 616: m->m_len = len;
617: m->m_pkthdr.len = len;
1.1 cgd 618: } else
1.35 mycroft 619: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 620: }
621:
1.193 scw 622: #if defined(IPSEC)
1.149 wiz 623: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 624: m->m_flags &= ~M_CANFASTFWD;
625: #else
1.64 thorpej 626: /*
627: * Assume that we can create a fast-forward IP flow entry
628: * based on this packet.
629: */
630: m->m_flags |= M_CANFASTFWD;
1.94 itojun 631: #endif
1.64 thorpej 632:
1.36 mrg 633: #ifdef PFIL_HOOKS
1.33 mrg 634: /*
1.64 thorpej 635: * Run through list of hooks for input packets. If there are any
636: * filters which require that additional packets in the flow are
637: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
638: * Note that filters must _never_ set this flag, as another filter
639: * in the list may have previously cleared it.
1.33 mrg 640: */
1.127 itojun 641: /*
642: * let ipfilter look at packet on the wire,
643: * not the decapsulated packet.
644: */
645: #ifdef IPSEC
1.136 itojun 646: if (!ipsec_getnhist(m))
1.186 scw 647: #elif defined(FAST_IPSEC)
648: if (!ipsec_indone(m))
1.127 itojun 649: #else
650: if (1)
651: #endif
652: {
1.169 itojun 653: struct in_addr odst;
654:
655: odst = ip->ip_dst;
1.127 itojun 656: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 657: PFIL_IN) != 0)
658: return;
1.127 itojun 659: if (m == NULL)
660: return;
661: ip = mtod(m, struct ip *);
1.142 darrenr 662: hlen = ip->ip_hl << 2;
1.205 darrenr 663: /*
664: * XXX The setting of "srcrt" here is to prevent ip_forward()
665: * from generating ICMP redirects for packets that have
666: * been redirected by a hook back out on to the same LAN that
667: * they came from and is not an indication that the packet
668: * is being inffluenced by source routing options. This
669: * allows things like
670: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
671: * where tlp0 is both on the 1.1.1.0/24 network and is the
672: * default route for hosts on 1.1.1.0/24. Of course this
673: * also requires a "map tlp0 ..." to complete the story.
674: * One might argue whether or not this kind of network config.
1.212 perry 675: * should be supported in this manner...
1.205 darrenr 676: */
1.169 itojun 677: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 678: }
1.36 mrg 679: #endif /* PFIL_HOOKS */
1.123 thorpej 680:
681: #ifdef ALTQ
682: /* XXX Temporary until ALTQ is changed to use a pfil hook */
683: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
684: /* packet dropped by traffic conditioner */
685: return;
686: }
687: #endif
1.121 thorpej 688:
689: /*
1.1 cgd 690: * Process options and, if not destined for us,
691: * ship it on. ip_dooptions returns 1 when an
692: * error was detected (causing an icmp message
693: * to be sent and the original packet to be freed).
694: */
695: ip_nhops = 0; /* for source routed packets */
696: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 697: return;
1.1 cgd 698:
699: /*
1.165 christos 700: * Enable a consistency check between the destination address
701: * and the arrival interface for a unicast packet (the RFC 1122
702: * strong ES model) if IP forwarding is disabled and the packet
703: * is not locally generated.
704: *
705: * XXX - Checking also should be disabled if the destination
706: * address is ipnat'ed to a different interface.
707: *
708: * XXX - Checking is incompatible with IP aliases added
709: * to the loopback interface instead of the interface where
710: * the packets are received.
711: *
712: * XXX - We need to add a per ifaddr flag for this so that
713: * we get finer grain control.
714: */
715: checkif = ip_checkinterface && (ipforwarding == 0) &&
716: (m->m_pkthdr.rcvif != NULL) &&
717: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
718:
719: /*
1.1 cgd 720: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 721: *
722: * Traditional 4.4BSD did not consult IFF_UP at all.
723: * The behavior here is to treat addresses on !IFF_UP interface
724: * as not mine.
1.1 cgd 725: */
1.100 itojun 726: downmatch = 0;
1.140 matt 727: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 728: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 729: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
730: continue;
1.97 itojun 731: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
732: break;
1.100 itojun 733: else
734: downmatch++;
1.97 itojun 735: }
736: }
1.86 thorpej 737: if (ia != NULL)
738: goto ours;
1.225 christos 739: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 740: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 741: if (ifa->ifa_addr->sa_family != AF_INET)
742: continue;
1.57 tls 743: ia = ifatoia(ifa);
1.35 mycroft 744: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
745: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 746: /*
747: * Look for all-0's host part (old broadcast addr),
748: * either for subnet or net.
749: */
750: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 751: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 752: goto ours;
1.57 tls 753: /*
754: * An interface with IP address zero accepts
755: * all packets that arrive on that interface.
756: */
757: if (in_nullhost(ia->ia_addr.sin_addr))
758: goto ours;
1.1 cgd 759: }
760: }
1.18 mycroft 761: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 762: struct in_multi *inm;
763: #ifdef MROUTING
764: extern struct socket *ip_mrouter;
1.10 brezak 765:
1.4 hpeyerl 766: if (ip_mrouter) {
767: /*
768: * If we are acting as a multicast router, all
769: * incoming multicast packets are passed to the
770: * kernel-level multicast forwarding function.
771: * The packet is returned (relatively) intact; if
772: * ip_mforward() returns a non-zero value, the packet
773: * must be discarded, else it may be accepted below.
774: *
775: * (The IP ident field is put in the same byte order
776: * as expected when ip_mforward() is called from
777: * ip_output().)
778: */
1.13 mycroft 779: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
780: ipstat.ips_cantforward++;
1.4 hpeyerl 781: m_freem(m);
1.89 itojun 782: return;
1.4 hpeyerl 783: }
784:
785: /*
786: * The process-level routing demon needs to receive
787: * all multicast IGMP packets, whether or not this
788: * host belongs to their destination groups.
789: */
790: if (ip->ip_p == IPPROTO_IGMP)
791: goto ours;
1.13 mycroft 792: ipstat.ips_forward++;
1.4 hpeyerl 793: }
794: #endif
795: /*
796: * See if we belong to the destination multicast group on the
797: * arrival interface.
798: */
799: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
800: if (inm == NULL) {
1.13 mycroft 801: ipstat.ips_cantforward++;
1.4 hpeyerl 802: m_freem(m);
1.89 itojun 803: return;
1.4 hpeyerl 804: }
805: goto ours;
806: }
1.19 mycroft 807: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 808: in_nullhost(ip->ip_dst))
1.1 cgd 809: goto ours;
810:
811: /*
812: * Not for us; forward if possible and desirable.
813: */
814: if (ipforwarding == 0) {
815: ipstat.ips_cantforward++;
816: m_freem(m);
1.100 itojun 817: } else {
818: /*
819: * If ip_dst matched any of my address on !IFF_UP interface,
820: * and there's no IFF_UP interface that matches ip_dst,
821: * send icmp unreach. Forwarding it will result in in-kernel
822: * forwarding loop till TTL goes to 0.
823: */
824: if (downmatch) {
825: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
826: ipstat.ips_cantforward++;
827: return;
828: }
1.145 itojun 829: #ifdef IPSEC
830: if (ipsec4_in_reject(m, NULL)) {
831: ipsecstat.in_polvio++;
832: goto bad;
833: }
834: #endif
1.173 jonathan 835: #ifdef FAST_IPSEC
836: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
837: s = splsoftnet();
838: if (mtag != NULL) {
839: tdbi = (struct tdb_ident *)(mtag + 1);
840: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
841: } else {
842: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 843: IP_FORWARDING, &error);
1.173 jonathan 844: }
845: if (sp == NULL) { /* NB: can happen if error */
846: splx(s);
847: /*XXX error stat???*/
848: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
849: goto bad;
850: }
851:
852: /*
853: * Check security policy against packet attributes.
854: */
855: error = ipsec_in_reject(sp, m);
856: KEY_FREESP(&sp);
857: splx(s);
858: if (error) {
859: ipstat.ips_cantforward++;
860: goto bad;
1.193 scw 861: }
862:
863: /*
864: * Peek at the outbound SP for this packet to determine if
865: * it's a Fast Forward candidate.
866: */
867: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
868: if (mtag != NULL)
869: m->m_flags &= ~M_CANFASTFWD;
870: else {
871: s = splsoftnet();
872: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
873: (IP_FORWARDING |
874: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
875: &error, NULL);
876: if (sp != NULL) {
877: m->m_flags &= ~M_CANFASTFWD;
878: KEY_FREESP(&sp);
879: }
880: splx(s);
1.173 jonathan 881: }
882: #endif /* FAST_IPSEC */
1.145 itojun 883:
1.169 itojun 884: ip_forward(m, srcrt);
1.100 itojun 885: }
1.89 itojun 886: return;
1.1 cgd 887:
888: ours:
889: /*
890: * If offset or IP_MF are set, must reassemble.
891: * Otherwise, nothing need be done.
892: * (We could look in the reassembly queue to see
893: * if the packet was previously fragmented,
894: * but it's not worth the time; just let them time out.)
895: */
1.155 itojun 896: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
897:
1.1 cgd 898: /*
899: * Look for queue of fragments
900: * of this datagram.
901: */
1.75 thorpej 902: IPQ_LOCK();
1.190 jonathan 903: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
904: /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
905: for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
906: fp = LIST_NEXT(fp, ipq_q)) {
1.1 cgd 907: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 908: in_hosteq(ip->ip_src, fp->ipq_src) &&
909: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 910: ip->ip_p == fp->ipq_p)
911: goto found;
1.190 jonathan 912:
913: }
1.1 cgd 914: fp = 0;
915: found:
916:
917: /*
918: * Adjust ip_len to not reflect header,
1.25 cgd 919: * set ipqe_mff if more fragments are expected,
1.1 cgd 920: * convert offset of this to bytes.
921: */
1.155 itojun 922: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
923: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 924: if (mff) {
1.16 cgd 925: /*
926: * Make sure that fragments have a data length
927: * that's a non-zero multiple of 8 bytes.
928: */
1.155 itojun 929: if (ntohs(ip->ip_len) == 0 ||
930: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 931: ipstat.ips_badfrags++;
1.75 thorpej 932: IPQ_UNLOCK();
1.16 cgd 933: goto bad;
934: }
935: }
1.155 itojun 936: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 937:
938: /*
939: * If datagram marked as having more fragments
940: * or if this is not the first fragment,
941: * attempt reassembly; if it succeeds, proceed.
942: */
1.155 itojun 943: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 944: ipstat.ips_fragments++;
1.72 thorpej 945: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 946: if (ipqe == NULL) {
947: ipstat.ips_rcvmemdrop++;
1.75 thorpej 948: IPQ_UNLOCK();
1.25 cgd 949: goto bad;
950: }
951: ipqe->ipqe_mff = mff;
1.50 thorpej 952: ipqe->ipqe_m = m;
1.25 cgd 953: ipqe->ipqe_ip = ip;
1.190 jonathan 954: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 955: if (m == 0) {
956: IPQ_UNLOCK();
1.89 itojun 957: return;
1.75 thorpej 958: }
1.13 mycroft 959: ipstat.ips_reassembled++;
1.50 thorpej 960: ip = mtod(m, struct ip *);
1.74 thorpej 961: hlen = ip->ip_hl << 2;
1.155 itojun 962: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 963: } else
964: if (fp)
965: ip_freef(fp);
1.75 thorpej 966: IPQ_UNLOCK();
1.79 mycroft 967: }
1.128 itojun 968:
1.173 jonathan 969: #if defined(IPSEC)
1.128 itojun 970: /*
971: * enforce IPsec policy checking if we are seeing last header.
972: * note that we do not visit this with protocols with pcb layer
973: * code - like udp/tcp/raw ip.
974: */
975: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
976: ipsec4_in_reject(m, NULL)) {
977: ipsecstat.in_polvio++;
978: goto bad;
979: }
980: #endif
1.226 liamjfoy 981: #ifdef FAST_IPSEC
1.173 jonathan 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: /*
989: * Check if the packet has already had IPsec processing
990: * done. If so, then just pass it along. This tag gets
991: * set during AH, ESP, etc. input handling, before the
992: * packet is returned to the ip input queue for delivery.
1.212 perry 993: */
1.173 jonathan 994: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
995: s = splsoftnet();
996: if (mtag != NULL) {
997: tdbi = (struct tdb_ident *)(mtag + 1);
998: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
999: } else {
1000: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1001: IP_FORWARDING, &error);
1.173 jonathan 1002: }
1003: if (sp != NULL) {
1004: /*
1005: * Check security policy against packet attributes.
1006: */
1007: error = ipsec_in_reject(sp, m);
1008: KEY_FREESP(&sp);
1009: } else {
1010: /* XXX error stat??? */
1011: error = EINVAL;
1012: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1013: goto bad;
1014: }
1015: splx(s);
1016: if (error)
1017: goto bad;
1018: }
1019: #endif /* FAST_IPSEC */
1.1 cgd 1020:
1021: /*
1022: * Switch out to protocol's input routine.
1023: */
1.82 aidan 1024: #if IFA_STATS
1.122 itojun 1025: if (ia && ip)
1.155 itojun 1026: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1027: #endif
1.1 cgd 1028: ipstat.ips_delivered++;
1.89 itojun 1029: {
1030: int off = hlen, nh = ip->ip_p;
1031:
1032: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1033: return;
1034: }
1.1 cgd 1035: bad:
1036: m_freem(m);
1.135 thorpej 1037: return;
1038:
1039: badcsum:
1040: ipstat.ips_badsum++;
1041: m_freem(m);
1.1 cgd 1042: }
1043:
1044: /*
1045: * Take incoming datagram fragment and try to
1046: * reassemble it into whole datagram. If a chain for
1047: * reassembly of this datagram already exists, then it
1048: * is given as fp; otherwise have to make a chain.
1049: */
1.50 thorpej 1050: struct mbuf *
1.211 perry 1051: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1052: {
1.109 augustss 1053: struct mbuf *m = ipqe->ipqe_m;
1054: struct ipqent *nq, *p, *q;
1.25 cgd 1055: struct ip *ip;
1.1 cgd 1056: struct mbuf *t;
1.25 cgd 1057: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 1058: int i, next;
1059:
1.75 thorpej 1060: IPQ_LOCK_CHECK();
1061:
1.1 cgd 1062: /*
1063: * Presence of header sizes in mbufs
1064: * would confuse code below.
1065: */
1066: m->m_data += hlen;
1067: m->m_len -= hlen;
1068:
1.194 jonathan 1069: #ifdef notyet
1070: /* make sure fragment limit is up-to-date */
1071: CHECK_NMBCLUSTER_PARAMS();
1072:
1073: /* If we have too many fragments, drop the older half. */
1074: if (ip_nfrags >= ip_maxfrags)
1075: ip_reass_drophalf(void);
1076: #endif
1077:
1.1 cgd 1078: /*
1.192 jonathan 1079: * We are about to add a fragment; increment frag count.
1080: */
1081: ip_nfrags++;
1.212 perry 1082:
1.192 jonathan 1083: /*
1.1 cgd 1084: * If first fragment to arrive, create a reassembly queue.
1085: */
1086: if (fp == 0) {
1.131 itojun 1087: /*
1088: * Enforce upper bound on number of fragmented packets
1089: * for which we attempt reassembly;
1090: * If maxfrag is 0, never accept fragments.
1091: * If maxfrag is -1, accept all fragments without limitation.
1092: */
1093: if (ip_maxfragpackets < 0)
1094: ;
1095: else if (ip_nfragpackets >= ip_maxfragpackets)
1096: goto dropfrag;
1097: ip_nfragpackets++;
1.50 thorpej 1098: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1099: M_FTABLE, M_NOWAIT);
1100: if (fp == NULL)
1.1 cgd 1101: goto dropfrag;
1.190 jonathan 1102: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1103: fp->ipq_nfrags = 1;
1.1 cgd 1104: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1105: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1106: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1107: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1108: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1109: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1110: p = NULL;
1.1 cgd 1111: goto insert;
1.192 jonathan 1112: } else {
1113: fp->ipq_nfrags++;
1.1 cgd 1114: }
1115:
1116: /*
1117: * Find a segment which begins after this one does.
1118: */
1.148 matt 1119: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1120: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1121: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1122: break;
1123:
1124: /*
1125: * If there is a preceding segment, it may provide some of
1126: * our data already. If so, drop the data from the incoming
1127: * segment. If it provides all of our data, drop us.
1128: */
1.25 cgd 1129: if (p != NULL) {
1.155 itojun 1130: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1131: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1132: if (i > 0) {
1.155 itojun 1133: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1134: goto dropfrag;
1.50 thorpej 1135: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1136: ipqe->ipqe_ip->ip_off =
1137: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1138: ipqe->ipqe_ip->ip_len =
1139: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1140: }
1141: }
1142:
1143: /*
1144: * While we overlap succeeding segments trim them or,
1145: * if they are completely covered, dequeue them.
1146: */
1.155 itojun 1147: for (; q != NULL &&
1148: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1149: ntohs(q->ipqe_ip->ip_off); q = nq) {
1150: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1151: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1152: if (i < ntohs(q->ipqe_ip->ip_len)) {
1153: q->ipqe_ip->ip_len =
1154: htons(ntohs(q->ipqe_ip->ip_len) - i);
1155: q->ipqe_ip->ip_off =
1156: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1157: m_adj(q->ipqe_m, i);
1.1 cgd 1158: break;
1159: }
1.148 matt 1160: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1161: m_freem(q->ipqe_m);
1.148 matt 1162: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1163: pool_put(&ipqent_pool, q);
1.192 jonathan 1164: fp->ipq_nfrags--;
1165: ip_nfrags--;
1.1 cgd 1166: }
1167:
1168: insert:
1169: /*
1170: * Stick new segment in its place;
1171: * check for complete reassembly.
1172: */
1.25 cgd 1173: if (p == NULL) {
1.148 matt 1174: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1175: } else {
1.148 matt 1176: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1177: }
1.1 cgd 1178: next = 0;
1.148 matt 1179: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1180: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1181: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1182: return (0);
1.155 itojun 1183: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1184: }
1.25 cgd 1185: if (p->ipqe_mff)
1.1 cgd 1186: return (0);
1187:
1188: /*
1.41 thorpej 1189: * Reassembly is complete. Check for a bogus message size and
1190: * concatenate fragments.
1.1 cgd 1191: */
1.148 matt 1192: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1193: ip = q->ipqe_ip;
1.41 thorpej 1194: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1195: ipstat.ips_toolong++;
1196: ip_freef(fp);
1197: return (0);
1198: }
1.50 thorpej 1199: m = q->ipqe_m;
1.1 cgd 1200: t = m->m_next;
1201: m->m_next = 0;
1202: m_cat(m, t);
1.148 matt 1203: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1204: pool_put(&ipqent_pool, q);
1.25 cgd 1205: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1206: t = q->ipqe_m;
1.148 matt 1207: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1208: pool_put(&ipqent_pool, q);
1.1 cgd 1209: m_cat(m, t);
1210: }
1.192 jonathan 1211: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1212:
1213: /*
1214: * Create header for new ip packet by
1215: * modifying header of first packet;
1216: * dequeue and discard fragment reassembly header.
1217: * Make header visible.
1218: */
1.155 itojun 1219: ip->ip_len = htons(next);
1.25 cgd 1220: ip->ip_src = fp->ipq_src;
1221: ip->ip_dst = fp->ipq_dst;
1222: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1223: FREE(fp, M_FTABLE);
1.131 itojun 1224: ip_nfragpackets--;
1.1 cgd 1225: m->m_len += (ip->ip_hl << 2);
1226: m->m_data -= (ip->ip_hl << 2);
1227: /* some debugging cruft by sklower, below, will go away soon */
1228: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1229: int plen = 0;
1.50 thorpej 1230: for (t = m; t; t = t->m_next)
1231: plen += t->m_len;
1232: m->m_pkthdr.len = plen;
1.213 yamt 1233: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1234: }
1.50 thorpej 1235: return (m);
1.1 cgd 1236:
1237: dropfrag:
1.192 jonathan 1238: if (fp != 0)
1239: fp->ipq_nfrags--;
1240: ip_nfrags--;
1.1 cgd 1241: ipstat.ips_fragdropped++;
1242: m_freem(m);
1.72 thorpej 1243: pool_put(&ipqent_pool, ipqe);
1.1 cgd 1244: return (0);
1245: }
1246:
1247: /*
1248: * Free a fragment reassembly header and all
1249: * associated datagrams.
1250: */
1.8 mycroft 1251: void
1.211 perry 1252: ip_freef(struct ipq *fp)
1.1 cgd 1253: {
1.109 augustss 1254: struct ipqent *q, *p;
1.192 jonathan 1255: u_int nfrags = 0;
1.1 cgd 1256:
1.75 thorpej 1257: IPQ_LOCK_CHECK();
1258:
1.148 matt 1259: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1260: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1261: m_freem(q->ipqe_m);
1.192 jonathan 1262: nfrags++;
1.148 matt 1263: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1264: pool_put(&ipqent_pool, q);
1.1 cgd 1265: }
1.192 jonathan 1266:
1267: if (nfrags != fp->ipq_nfrags)
1268: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1269: ip_nfrags -= nfrags;
1.25 cgd 1270: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1271: FREE(fp, M_FTABLE);
1.131 itojun 1272: ip_nfragpackets--;
1.1 cgd 1273: }
1274:
1275: /*
1.194 jonathan 1276: * IP reassembly TTL machinery for multiplicative drop.
1277: */
1278: static u_int fragttl_histo[(IPFRAGTTL+1)];
1279:
1280:
1281: /*
1282: * Decrement TTL of all reasembly queue entries by `ticks'.
1283: * Count number of distinct fragments (as opposed to partial, fragmented
1284: * datagrams) in the reassembly queue. While we traverse the entire
1285: * reassembly queue, compute and return the median TTL over all fragments.
1286: */
1287: static u_int
1288: ip_reass_ttl_decr(u_int ticks)
1289: {
1.198 matt 1290: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1291: struct ipq *fp, *nfp;
1.198 matt 1292: int i;
1.212 perry 1293:
1.194 jonathan 1294: nfrags = 0;
1295: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1296:
1.194 jonathan 1297: for (i = 0; i < IPREASS_NHASH; i++) {
1298: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1299: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1300: 0 : fp->ipq_ttl - ticks);
1301: nfp = LIST_NEXT(fp, ipq_q);
1302: if (fp->ipq_ttl == 0) {
1303: ipstat.ips_fragtimeout++;
1304: ip_freef(fp);
1305: } else {
1306: nfrags += fp->ipq_nfrags;
1307: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1308: }
1309: }
1310: }
1311:
1312: KASSERT(ip_nfrags == nfrags);
1313:
1314: /* Find median (or other drop fraction) in histogram. */
1315: dropfraction = (ip_nfrags / 2);
1316: keepfraction = ip_nfrags - dropfraction;
1317: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1318: median += fragttl_histo[i];
1319: if (median >= keepfraction)
1320: break;
1321: }
1322:
1323: /* Return TTL of median (or other fraction). */
1324: return (u_int)i;
1325: }
1326:
1327: void
1328: ip_reass_drophalf(void)
1329: {
1330:
1331: u_int median_ticks;
1332: /*
1333: * Compute median TTL of all fragments, and count frags
1334: * with that TTL or lower (roughly half of all fragments).
1335: */
1336: median_ticks = ip_reass_ttl_decr(0);
1337:
1338: /* Drop half. */
1339: median_ticks = ip_reass_ttl_decr(median_ticks);
1340:
1341: }
1342:
1343: /*
1.1 cgd 1344: * IP timer processing;
1345: * if a timer expires on a reassembly
1346: * queue, discard it.
1347: */
1.8 mycroft 1348: void
1.211 perry 1349: ip_slowtimo(void)
1.1 cgd 1350: {
1.191 jonathan 1351: static u_int dropscanidx = 0;
1352: u_int i;
1.194 jonathan 1353: u_int median_ttl;
1.24 mycroft 1354: int s = splsoftnet();
1.1 cgd 1355:
1.75 thorpej 1356: IPQ_LOCK();
1.194 jonathan 1357:
1358: /* Age TTL of all fragments by 1 tick .*/
1359: median_ttl = ip_reass_ttl_decr(1);
1360:
1361: /* make sure fragment limit is up-to-date */
1362: CHECK_NMBCLUSTER_PARAMS();
1363:
1364: /* If we have too many fragments, drop the older half. */
1365: if (ip_nfrags > ip_maxfrags)
1366: ip_reass_ttl_decr(median_ttl);
1367:
1.131 itojun 1368: /*
1.194 jonathan 1369: * If we are over the maximum number of fragmented packets
1.131 itojun 1370: * (due to the limit being lowered), drain off
1.190 jonathan 1371: * enough to get down to the new limit. Start draining
1372: * from the reassembly hashqueue most recently drained.
1.131 itojun 1373: */
1374: if (ip_maxfragpackets < 0)
1375: ;
1376: else {
1.190 jonathan 1377: int wrapped = 0;
1378:
1379: i = dropscanidx;
1380: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1381: while (LIST_FIRST(&ipq[i]) != NULL)
1382: ip_freef(LIST_FIRST(&ipq[i]));
1383: if (++i >= IPREASS_NHASH) {
1384: i = 0;
1385: }
1386: /*
1387: * Dont scan forever even if fragment counters are
1388: * wrong: stop after scanning entire reassembly queue.
1389: */
1390: if (i == dropscanidx)
1391: wrapped = 1;
1392: }
1393: dropscanidx = i;
1.131 itojun 1394: }
1.75 thorpej 1395: IPQ_UNLOCK();
1.63 matt 1396: #ifdef GATEWAY
1397: ipflow_slowtimo();
1398: #endif
1.1 cgd 1399: splx(s);
1400: }
1401:
1402: /*
1403: * Drain off all datagram fragments.
1404: */
1.8 mycroft 1405: void
1.211 perry 1406: ip_drain(void)
1.1 cgd 1407: {
1408:
1.75 thorpej 1409: /*
1410: * We may be called from a device's interrupt context. If
1411: * the ipq is already busy, just bail out now.
1412: */
1413: if (ipq_lock_try() == 0)
1414: return;
1415:
1.194 jonathan 1416: /*
1417: * Drop half the total fragments now. If more mbufs are needed,
1418: * we will be called again soon.
1419: */
1420: ip_reass_drophalf();
1.75 thorpej 1421:
1422: IPQ_UNLOCK();
1.1 cgd 1423: }
1424:
1425: /*
1426: * Do option processing on a datagram,
1427: * possibly discarding it if bad options are encountered,
1428: * or forwarding it if source-routed.
1429: * Returns 1 if packet has been forwarded/freed,
1430: * 0 if the packet should be processed further.
1431: */
1.8 mycroft 1432: int
1.211 perry 1433: ip_dooptions(struct mbuf *m)
1.1 cgd 1434: {
1.109 augustss 1435: struct ip *ip = mtod(m, struct ip *);
1436: u_char *cp, *cp0;
1437: struct ip_timestamp *ipt;
1438: struct in_ifaddr *ia;
1.1 cgd 1439: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1440: struct in_addr dst;
1.1 cgd 1441: n_time ntime;
1442:
1.13 mycroft 1443: dst = ip->ip_dst;
1.1 cgd 1444: cp = (u_char *)(ip + 1);
1445: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1446: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1447: opt = cp[IPOPT_OPTVAL];
1448: if (opt == IPOPT_EOL)
1449: break;
1450: if (opt == IPOPT_NOP)
1451: optlen = 1;
1452: else {
1.113 itojun 1453: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1454: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1455: goto bad;
1456: }
1.1 cgd 1457: optlen = cp[IPOPT_OLEN];
1.114 itojun 1458: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1459: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1460: goto bad;
1461: }
1462: }
1463: switch (opt) {
1464:
1465: default:
1466: break;
1467:
1468: /*
1469: * Source routing with record.
1470: * Find interface with current destination address.
1471: * If none on this machine then drop if strictly routed,
1472: * or do nothing if loosely routed.
1473: * Record interface address and bring up next address
1474: * component. If strictly routed make sure next
1475: * address is on directly accessible net.
1476: */
1477: case IPOPT_LSRR:
1478: case IPOPT_SSRR:
1.47 cjs 1479: if (ip_allowsrcrt == 0) {
1480: type = ICMP_UNREACH;
1481: code = ICMP_UNREACH_NET_PROHIB;
1482: goto bad;
1483: }
1.114 itojun 1484: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1485: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1486: goto bad;
1487: }
1.1 cgd 1488: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1489: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1490: goto bad;
1491: }
1492: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1493: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1494: if (ia == 0) {
1495: if (opt == IPOPT_SSRR) {
1496: type = ICMP_UNREACH;
1497: code = ICMP_UNREACH_SRCFAIL;
1498: goto bad;
1499: }
1500: /*
1501: * Loose routing, and not at next destination
1502: * yet; nothing to do except forward.
1503: */
1504: break;
1505: }
1506: off--; /* 0 origin */
1.112 sommerfe 1507: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1508: /*
1509: * End of source route. Should be for us.
1510: */
1511: save_rte(cp, ip->ip_src);
1512: break;
1513: }
1514: /*
1515: * locate outgoing interface
1516: */
1517: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1518: sizeof(ipaddr.sin_addr));
1.96 thorpej 1519: if (opt == IPOPT_SSRR)
1.196 itojun 1520: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1521: else
1.1 cgd 1522: ia = ip_rtaddr(ipaddr.sin_addr);
1523: if (ia == 0) {
1524: type = ICMP_UNREACH;
1525: code = ICMP_UNREACH_SRCFAIL;
1526: goto bad;
1527: }
1528: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1529: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1530: (caddr_t)(cp + off), sizeof(struct in_addr));
1531: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1532: /*
1533: * Let ip_intr's mcast routing check handle mcast pkts
1534: */
1.18 mycroft 1535: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1536: break;
1537:
1538: case IPOPT_RR:
1.114 itojun 1539: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1540: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1541: goto bad;
1542: }
1.1 cgd 1543: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1544: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1545: goto bad;
1546: }
1547: /*
1548: * If no space remains, ignore.
1549: */
1550: off--; /* 0 origin */
1.112 sommerfe 1551: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1552: break;
1553: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1554: sizeof(ipaddr.sin_addr));
1555: /*
1556: * locate outgoing interface; if we're the destination,
1557: * use the incoming interface (should be same).
1558: */
1.96 thorpej 1559: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1560: == NULL &&
1561: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1562: type = ICMP_UNREACH;
1563: code = ICMP_UNREACH_HOST;
1564: goto bad;
1565: }
1.20 mycroft 1566: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1567: (caddr_t)(cp + off), sizeof(struct in_addr));
1568: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1569: break;
1570:
1571: case IPOPT_TS:
1572: code = cp - (u_char *)ip;
1573: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1574: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1575: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1576: goto bad;
1.114 itojun 1577: }
1578: if (ipt->ipt_ptr < 5) {
1579: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1580: goto bad;
1581: }
1.15 cgd 1582: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1583: if (++ipt->ipt_oflw == 0) {
1584: code = (u_char *)&ipt->ipt_ptr -
1585: (u_char *)ip;
1.1 cgd 1586: goto bad;
1.114 itojun 1587: }
1.1 cgd 1588: break;
1589: }
1.104 thorpej 1590: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1591: switch (ipt->ipt_flg) {
1592:
1593: case IPOPT_TS_TSONLY:
1594: break;
1595:
1596: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1597: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1598: sizeof(struct in_addr) > ipt->ipt_len) {
1599: code = (u_char *)&ipt->ipt_ptr -
1600: (u_char *)ip;
1.1 cgd 1601: goto bad;
1.114 itojun 1602: }
1.13 mycroft 1603: ipaddr.sin_addr = dst;
1.96 thorpej 1604: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1605: m->m_pkthdr.rcvif));
1.13 mycroft 1606: if (ia == 0)
1607: continue;
1.104 thorpej 1608: bcopy(&ia->ia_addr.sin_addr,
1609: cp0, sizeof(struct in_addr));
1.1 cgd 1610: ipt->ipt_ptr += sizeof(struct in_addr);
1611: break;
1612:
1613: case IPOPT_TS_PRESPEC:
1.66 thorpej 1614: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1615: sizeof(struct in_addr) > ipt->ipt_len) {
1616: code = (u_char *)&ipt->ipt_ptr -
1617: (u_char *)ip;
1.1 cgd 1618: goto bad;
1.114 itojun 1619: }
1.104 thorpej 1620: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1621: sizeof(struct in_addr));
1.96 thorpej 1622: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1623: == NULL)
1.1 cgd 1624: continue;
1625: ipt->ipt_ptr += sizeof(struct in_addr);
1626: break;
1627:
1628: default:
1.114 itojun 1629: /* XXX can't take &ipt->ipt_flg */
1630: code = (u_char *)&ipt->ipt_ptr -
1631: (u_char *)ip + 1;
1.1 cgd 1632: goto bad;
1633: }
1634: ntime = iptime();
1.107 thorpej 1635: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1636: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1637: sizeof(n_time));
1638: ipt->ipt_ptr += sizeof(n_time);
1639: }
1640: }
1641: if (forward) {
1.26 thorpej 1642: if (ip_forwsrcrt == 0) {
1643: type = ICMP_UNREACH;
1644: code = ICMP_UNREACH_SRCFAIL;
1645: goto bad;
1646: }
1.1 cgd 1647: ip_forward(m, 1);
1648: return (1);
1.13 mycroft 1649: }
1650: return (0);
1.1 cgd 1651: bad:
1.13 mycroft 1652: icmp_error(m, type, code, 0, 0);
1653: ipstat.ips_badoptions++;
1.1 cgd 1654: return (1);
1655: }
1656:
1657: /*
1658: * Given address of next destination (final or next hop),
1659: * return internet address info of interface to be used to get there.
1660: */
1661: struct in_ifaddr *
1.211 perry 1662: ip_rtaddr(struct in_addr dst)
1.1 cgd 1663: {
1.109 augustss 1664: struct sockaddr_in *sin;
1.1 cgd 1665:
1.19 mycroft 1666: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1667:
1.35 mycroft 1668: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1669: if (ipforward_rt.ro_rt) {
1670: RTFREE(ipforward_rt.ro_rt);
1671: ipforward_rt.ro_rt = 0;
1672: }
1673: sin->sin_family = AF_INET;
1674: sin->sin_len = sizeof(*sin);
1675: sin->sin_addr = dst;
1676:
1677: rtalloc(&ipforward_rt);
1678: }
1679: if (ipforward_rt.ro_rt == 0)
1680: return ((struct in_ifaddr *)0);
1.19 mycroft 1681: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1682: }
1683:
1684: /*
1685: * Save incoming source route for use in replies,
1686: * to be picked up later by ip_srcroute if the receiver is interested.
1687: */
1.13 mycroft 1688: void
1.211 perry 1689: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1690: {
1691: unsigned olen;
1692:
1693: olen = option[IPOPT_OLEN];
1694: #ifdef DIAGNOSTIC
1695: if (ipprintfs)
1.39 christos 1696: printf("save_rte: olen %d\n", olen);
1.89 itojun 1697: #endif /* 0 */
1.1 cgd 1698: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1699: return;
1700: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1701: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1702: ip_srcrt.dst = dst;
1703: }
1704:
1705: /*
1706: * Retrieve incoming source route for use in replies,
1707: * in the same form used by setsockopt.
1708: * The first hop is placed before the options, will be removed later.
1709: */
1710: struct mbuf *
1.211 perry 1711: ip_srcroute(void)
1.1 cgd 1712: {
1.109 augustss 1713: struct in_addr *p, *q;
1714: struct mbuf *m;
1.1 cgd 1715:
1716: if (ip_nhops == 0)
1717: return ((struct mbuf *)0);
1718: m = m_get(M_DONTWAIT, MT_SOOPTS);
1719: if (m == 0)
1720: return ((struct mbuf *)0);
1721:
1.164 matt 1722: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1723: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1724:
1725: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1726: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1727: OPTSIZ;
1728: #ifdef DIAGNOSTIC
1729: if (ipprintfs)
1.39 christos 1730: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1731: #endif
1732:
1733: /*
1734: * First save first hop for return route
1735: */
1736: p = &ip_srcrt.route[ip_nhops - 1];
1737: *(mtod(m, struct in_addr *)) = *p--;
1738: #ifdef DIAGNOSTIC
1739: if (ipprintfs)
1.39 christos 1740: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1741: #endif
1742:
1743: /*
1744: * Copy option fields and padding (nop) to mbuf.
1745: */
1746: ip_srcrt.nop = IPOPT_NOP;
1747: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1748: bcopy((caddr_t)&ip_srcrt.nop,
1749: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1750: q = (struct in_addr *)(mtod(m, caddr_t) +
1751: sizeof(struct in_addr) + OPTSIZ);
1752: #undef OPTSIZ
1753: /*
1754: * Record return path as an IP source route,
1755: * reversing the path (pointers are now aligned).
1756: */
1757: while (p >= ip_srcrt.route) {
1758: #ifdef DIAGNOSTIC
1759: if (ipprintfs)
1.39 christos 1760: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1761: #endif
1762: *q++ = *p--;
1763: }
1764: /*
1765: * Last hop goes to final destination.
1766: */
1767: *q = ip_srcrt.dst;
1768: #ifdef DIAGNOSTIC
1769: if (ipprintfs)
1.39 christos 1770: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1771: #endif
1772: return (m);
1773: }
1774:
1775: /*
1776: * Strip out IP options, at higher
1777: * level protocol in the kernel.
1778: * Second argument is buffer to which options
1779: * will be moved, and return value is their length.
1780: * XXX should be deleted; last arg currently ignored.
1781: */
1.8 mycroft 1782: void
1.211 perry 1783: ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
1.1 cgd 1784: {
1.109 augustss 1785: int i;
1.1 cgd 1786: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1787: caddr_t opts;
1.1 cgd 1788: int olen;
1789:
1.79 mycroft 1790: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1791: opts = (caddr_t)(ip + 1);
1792: i = m->m_len - (sizeof (struct ip) + olen);
1793: bcopy(opts + olen, opts, (unsigned)i);
1794: m->m_len -= olen;
1795: if (m->m_flags & M_PKTHDR)
1796: m->m_pkthdr.len -= olen;
1.155 itojun 1797: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79 mycroft 1798: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1799: }
1800:
1.139 matt 1801: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1802: 0, 0, 0, 0,
1803: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1804: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1805: EMSGSIZE, EHOSTUNREACH, 0, 0,
1806: 0, 0, 0, 0,
1807: ENOPROTOOPT
1808: };
1809:
1810: /*
1811: * Forward a packet. If some error occurs return the sender
1812: * an icmp packet. Note we can't always generate a meaningful
1813: * icmp message because icmp doesn't have a large enough repertoire
1814: * of codes and types.
1815: *
1816: * If not forwarding, just drop the packet. This could be confusing
1817: * if ipforwarding was zero but some routing protocol was advancing
1818: * us as a gateway to somewhere. However, we must let the routing
1819: * protocol deal with that.
1820: *
1821: * The srcrt parameter indicates whether the packet is being forwarded
1822: * via a source route.
1823: */
1.13 mycroft 1824: void
1.211 perry 1825: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1826: {
1.109 augustss 1827: struct ip *ip = mtod(m, struct ip *);
1828: struct sockaddr_in *sin;
1829: struct rtentry *rt;
1.220 christos 1830: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1831: struct mbuf *mcopy;
1.13 mycroft 1832: n_long dest;
1.164 matt 1833:
1834: /*
1835: * We are now in the output path.
1836: */
1837: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1838:
1839: /*
1840: * Clear any in-bound checksum flags for this packet.
1841: */
1842: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1843:
1.13 mycroft 1844: dest = 0;
1.1 cgd 1845: #ifdef DIAGNOSTIC
1.224 joerg 1846: if (ipprintfs) {
1847: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1848: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1849: }
1.1 cgd 1850: #endif
1.93 sommerfe 1851: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1852: ipstat.ips_cantforward++;
1853: m_freem(m);
1854: return;
1855: }
1856: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1857: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1858: return;
1859: }
1860:
1.19 mycroft 1861: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1862: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1863: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1864: if (ipforward_rt.ro_rt) {
1865: RTFREE(ipforward_rt.ro_rt);
1866: ipforward_rt.ro_rt = 0;
1867: }
1868: sin->sin_family = AF_INET;
1.35 mycroft 1869: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1870: sin->sin_addr = ip->ip_dst;
1871:
1872: rtalloc(&ipforward_rt);
1873: if (ipforward_rt.ro_rt == 0) {
1.218 seanb 1874: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.1 cgd 1875: return;
1876: }
1877: rt = ipforward_rt.ro_rt;
1878: }
1879:
1880: /*
1.34 mycroft 1881: * Save at most 68 bytes of the packet in case
1.1 cgd 1882: * we need to generate an ICMP message to the src.
1.119 itojun 1883: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1884: */
1.155 itojun 1885: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1886: if (mcopy)
1887: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1888:
1.221 christos 1889: ip->ip_ttl -= IPTTLDEC;
1890:
1.1 cgd 1891: /*
1892: * If forwarding packet using same interface that it came in on,
1893: * perhaps should send a redirect to sender to shortcut a hop.
1894: * Only send redirect if source is sending directly to us,
1895: * and if packet was not source routed (or has any options).
1896: * Also, don't send redirect if forwarding using a default route
1897: * or a route modified by a redirect.
1898: */
1899: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1900: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1901: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1902: ipsendredirects && !srcrt) {
1.19 mycroft 1903: if (rt->rt_ifa &&
1904: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1905: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1906: if (rt->rt_flags & RTF_GATEWAY)
1907: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1908: else
1909: dest = ip->ip_dst.s_addr;
1910: /*
1911: * Router requirements says to only send host
1912: * redirects.
1913: */
1914: type = ICMP_REDIRECT;
1915: code = ICMP_REDIRECT_HOST;
1.1 cgd 1916: #ifdef DIAGNOSTIC
1.77 thorpej 1917: if (ipprintfs)
1918: printf("redirect (%d) to %x\n", code,
1919: (u_int32_t)dest);
1.1 cgd 1920: #endif
1921: }
1922: }
1923:
1.27 thorpej 1924: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173 jonathan 1925: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1926: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1927:
1.1 cgd 1928: if (error)
1929: ipstat.ips_cantforward++;
1930: else {
1931: ipstat.ips_forward++;
1932: if (type)
1933: ipstat.ips_redirectsent++;
1934: else {
1.63 matt 1935: if (mcopy) {
1936: #ifdef GATEWAY
1.64 thorpej 1937: if (mcopy->m_flags & M_CANFASTFWD)
1938: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1939: #endif
1.1 cgd 1940: m_freem(mcopy);
1.63 matt 1941: }
1.1 cgd 1942: return;
1943: }
1944: }
1945: if (mcopy == NULL)
1946: return;
1.13 mycroft 1947:
1.1 cgd 1948: switch (error) {
1949:
1950: case 0: /* forwarded, but need redirect */
1951: /* type, code set above */
1952: break;
1953:
1954: case ENETUNREACH: /* shouldn't happen, checked above */
1955: case EHOSTUNREACH:
1956: case ENETDOWN:
1957: case EHOSTDOWN:
1958: default:
1959: type = ICMP_UNREACH;
1960: code = ICMP_UNREACH_HOST;
1961: break;
1962:
1963: case EMSGSIZE:
1964: type = ICMP_UNREACH;
1965: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1966: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13 mycroft 1967: if (ipforward_rt.ro_rt)
1.220 christos 1968: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1969: #else
1970: /*
1971: * If the packet is routed over IPsec tunnel, tell the
1972: * originator the tunnel MTU.
1973: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1974: * XXX quickhack!!!
1975: */
1976: if (ipforward_rt.ro_rt) {
1977: struct secpolicy *sp;
1978: int ipsecerror;
1.95 itojun 1979: size_t ipsechdr;
1.89 itojun 1980: struct route *ro;
1981:
1982: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1983: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1984: &ipsecerror);
1.89 itojun 1985:
1986: if (sp == NULL)
1.220 christos 1987: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1988: else {
1989: /* count IPsec header size */
1.95 itojun 1990: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1991: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1992:
1993: /*
1994: * find the correct route for outer IPv4
1995: * header, compute tunnel MTU.
1996: */
1.220 christos 1997:
1.89 itojun 1998: if (sp->req != NULL
1.95 itojun 1999: && sp->req->sav != NULL
2000: && sp->req->sav->sah != NULL) {
2001: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 2002: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1.220 christos 2003: destmtu =
1.151 itojun 2004: ro->ro_rt->rt_rmx.rmx_mtu ?
2005: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 2006: ro->ro_rt->rt_ifp->if_mtu;
1.220 christos 2007: destmtu -= ipsechdr;
1.89 itojun 2008: }
2009: }
2010:
1.173 jonathan 2011: #ifdef IPSEC
1.89 itojun 2012: key_freesp(sp);
1.173 jonathan 2013: #else
2014: KEY_FREESP(&sp);
2015: #endif
1.89 itojun 2016: }
2017: }
2018: #endif /*IPSEC*/
1.1 cgd 2019: ipstat.ips_cantfrag++;
2020: break;
2021:
2022: case ENOBUFS:
1.143 itojun 2023: #if 1
2024: /*
2025: * a router should not generate ICMP_SOURCEQUENCH as
2026: * required in RFC1812 Requirements for IP Version 4 Routers.
2027: * source quench could be a big problem under DoS attacks,
1.149 wiz 2028: * or if the underlying interface is rate-limited.
1.143 itojun 2029: */
2030: if (mcopy)
2031: m_freem(mcopy);
2032: return;
2033: #else
1.1 cgd 2034: type = ICMP_SOURCEQUENCH;
2035: code = 0;
2036: break;
1.143 itojun 2037: #endif
1.1 cgd 2038: }
1.220 christos 2039: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2040: }
2041:
2042: void
1.211 perry 2043: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2044: struct mbuf *m)
1.44 thorpej 2045: {
2046:
2047: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2048: struct timeval tv;
2049:
2050: microtime(&tv);
2051: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
2052: SCM_TIMESTAMP, SOL_SOCKET);
2053: if (*mp)
2054: mp = &(*mp)->m_next;
2055: }
2056: if (inp->inp_flags & INP_RECVDSTADDR) {
2057: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2058: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2059: if (*mp)
2060: mp = &(*mp)->m_next;
2061: }
2062: #ifdef notyet
2063: /*
2064: * XXX
2065: * Moving these out of udp_input() made them even more broken
2066: * than they already were.
2067: * - fenner@parc.xerox.com
2068: */
2069: /* options were tossed already */
2070: if (inp->inp_flags & INP_RECVOPTS) {
2071: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2072: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2073: if (*mp)
2074: mp = &(*mp)->m_next;
2075: }
2076: /* ip_srcroute doesn't do what we want here, need to fix */
2077: if (inp->inp_flags & INP_RECVRETOPTS) {
2078: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2079: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2080: if (*mp)
2081: mp = &(*mp)->m_next;
2082: }
2083: #endif
2084: if (inp->inp_flags & INP_RECVIF) {
2085: struct sockaddr_dl sdl;
2086:
2087: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
2088: sdl.sdl_family = AF_LINK;
2089: sdl.sdl_index = m->m_pkthdr.rcvif ?
2090: m->m_pkthdr.rcvif->if_index : 0;
2091: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
2092: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
2093: IP_RECVIF, IPPROTO_IP);
2094: if (*mp)
2095: mp = &(*mp)->m_next;
2096: }
1.13 mycroft 2097: }
2098:
1.189 atatat 2099: /*
1.228 elad 2100: * sysctl helper routine for net.inet.ip.forwsrcrt.
2101: */
2102: static int
2103: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2104: {
2105: int error, tmp;
2106: struct sysctlnode node;
2107:
2108: node = *rnode;
2109: tmp = ip_forwsrcrt;
2110: node.sysctl_data = &tmp;
2111: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2112: if (error || newp == NULL)
2113: return (error);
2114:
1.230 ! elad 2115: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
! 2116: NULL, NULL, NULL, NULL) != KAUTH_RESULT_ALLOW)
1.228 elad 2117: return (EPERM);
2118:
2119: ip_forwsrcrt = tmp;
2120:
2121: return (0);
2122: }
2123:
2124: /*
1.189 atatat 2125: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2126: * range of the new value and tweaks timers if it changes.
2127: */
2128: static int
2129: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2130: {
1.189 atatat 2131: int error, tmp;
2132: struct sysctlnode node;
2133:
2134: node = *rnode;
2135: tmp = ip_mtudisc_timeout;
2136: node.sysctl_data = &tmp;
2137: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2138: if (error || newp == NULL)
2139: return (error);
2140: if (tmp < 0)
2141: return (EINVAL);
1.52 thorpej 2142:
1.189 atatat 2143: ip_mtudisc_timeout = tmp;
2144: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2145:
2146: return (0);
2147: }
1.54 lukem 2148:
1.65 matt 2149: #ifdef GATEWAY
1.189 atatat 2150: /*
2151: * sysctl helper routine for net.inet.ip.maxflows. apparently if
2152: * maxflows is even looked up, we "reap flows".
2153: */
2154: static int
2155: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2156: {
2157: int s;
1.67 thorpej 2158:
1.217 atatat 2159: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.189 atatat 2160: if (s)
2161: return (s);
1.212 perry 2162:
1.189 atatat 2163: s = splsoftnet();
2164: ipflow_reap(0);
2165: splx(s);
1.144 martin 2166:
1.189 atatat 2167: return (0);
2168: }
2169: #endif /* GATEWAY */
1.117 tron 2170:
1.131 itojun 2171:
1.189 atatat 2172: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2173: {
2174: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2175:
1.197 atatat 2176: sysctl_createv(clog, 0, NULL, NULL,
2177: CTLFLAG_PERMANENT,
1.189 atatat 2178: CTLTYPE_NODE, "net", NULL,
2179: NULL, 0, NULL, 0,
2180: CTL_NET, CTL_EOL);
1.197 atatat 2181: sysctl_createv(clog, 0, NULL, NULL,
2182: CTLFLAG_PERMANENT,
1.203 atatat 2183: CTLTYPE_NODE, "inet",
2184: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2185: NULL, 0, NULL, 0,
2186: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2187: sysctl_createv(clog, 0, NULL, NULL,
2188: CTLFLAG_PERMANENT,
1.203 atatat 2189: CTLTYPE_NODE, "ip",
2190: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2191: NULL, 0, NULL, 0,
2192: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2193:
1.197 atatat 2194: sysctl_createv(clog, 0, NULL, NULL,
2195: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2196: CTLTYPE_INT, "forwarding",
2197: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2198: NULL, 0, &ipforwarding, 0,
2199: CTL_NET, PF_INET, IPPROTO_IP,
2200: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2201: sysctl_createv(clog, 0, NULL, NULL,
2202: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2203: CTLTYPE_INT, "redirect",
2204: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2205: NULL, 0, &ipsendredirects, 0,
2206: CTL_NET, PF_INET, IPPROTO_IP,
2207: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2208: sysctl_createv(clog, 0, NULL, NULL,
2209: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2210: CTLTYPE_INT, "ttl",
2211: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2212: NULL, 0, &ip_defttl, 0,
2213: CTL_NET, PF_INET, IPPROTO_IP,
2214: IPCTL_DEFTTL, CTL_EOL);
2215: #ifdef IPCTL_DEFMTU
1.197 atatat 2216: sysctl_createv(clog, 0, NULL, NULL,
2217: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2218: CTLTYPE_INT, "mtu",
2219: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2220: NULL, 0, &ip_mtu, 0,
2221: CTL_NET, PF_INET, IPPROTO_IP,
2222: IPCTL_DEFMTU, CTL_EOL);
2223: #endif /* IPCTL_DEFMTU */
1.197 atatat 2224: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2225: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2226: CTLTYPE_INT, "forwsrcrt",
2227: SYSCTL_DESCR("Enable forwarding of source-routed "
2228: "datagrams"),
1.228 elad 2229: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2230: CTL_NET, PF_INET, IPPROTO_IP,
2231: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2232: sysctl_createv(clog, 0, NULL, NULL,
2233: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2234: CTLTYPE_INT, "directed-broadcast",
2235: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2236: NULL, 0, &ip_directedbcast, 0,
2237: CTL_NET, PF_INET, IPPROTO_IP,
2238: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2239: sysctl_createv(clog, 0, NULL, NULL,
2240: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2241: CTLTYPE_INT, "allowsrcrt",
2242: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2243: NULL, 0, &ip_allowsrcrt, 0,
2244: CTL_NET, PF_INET, IPPROTO_IP,
2245: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2246: sysctl_createv(clog, 0, NULL, NULL,
2247: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2248: CTLTYPE_INT, "subnetsarelocal",
2249: SYSCTL_DESCR("Whether logical subnets are considered "
2250: "local"),
1.189 atatat 2251: NULL, 0, &subnetsarelocal, 0,
2252: CTL_NET, PF_INET, IPPROTO_IP,
2253: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2254: sysctl_createv(clog, 0, NULL, NULL,
2255: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2256: CTLTYPE_INT, "mtudisc",
2257: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2258: NULL, 0, &ip_mtudisc, 0,
2259: CTL_NET, PF_INET, IPPROTO_IP,
2260: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2261: sysctl_createv(clog, 0, NULL, NULL,
2262: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2263: CTLTYPE_INT, "anonportmin",
2264: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2265: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2266: CTL_NET, PF_INET, IPPROTO_IP,
2267: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2268: sysctl_createv(clog, 0, NULL, NULL,
2269: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2270: CTLTYPE_INT, "anonportmax",
2271: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2272: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2273: CTL_NET, PF_INET, IPPROTO_IP,
2274: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2275: sysctl_createv(clog, 0, NULL, NULL,
2276: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2277: CTLTYPE_INT, "mtudisctimeout",
2278: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2279: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2280: CTL_NET, PF_INET, IPPROTO_IP,
2281: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2282: #ifdef GATEWAY
1.197 atatat 2283: sysctl_createv(clog, 0, NULL, NULL,
2284: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2285: CTLTYPE_INT, "maxflows",
2286: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2287: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2288: CTL_NET, PF_INET, IPPROTO_IP,
2289: IPCTL_MAXFLOWS, CTL_EOL);
2290: #endif /* GATEWAY */
1.197 atatat 2291: sysctl_createv(clog, 0, NULL, NULL,
2292: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2293: CTLTYPE_INT, "hostzerobroadcast",
2294: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2295: NULL, 0, &hostzeroisbroadcast, 0,
2296: CTL_NET, PF_INET, IPPROTO_IP,
2297: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2298: #if NGIF > 0
1.197 atatat 2299: sysctl_createv(clog, 0, NULL, NULL,
2300: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2301: CTLTYPE_INT, "gifttl",
2302: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2303: NULL, 0, &ip_gif_ttl, 0,
2304: CTL_NET, PF_INET, IPPROTO_IP,
2305: IPCTL_GIF_TTL, CTL_EOL);
2306: #endif /* NGIF */
2307: #ifndef IPNOPRIVPORTS
1.197 atatat 2308: sysctl_createv(clog, 0, NULL, NULL,
2309: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2310: CTLTYPE_INT, "lowportmin",
2311: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2312: "to assign"),
1.189 atatat 2313: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2314: CTL_NET, PF_INET, IPPROTO_IP,
2315: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2316: sysctl_createv(clog, 0, NULL, NULL,
2317: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2318: CTLTYPE_INT, "lowportmax",
2319: SYSCTL_DESCR("Highest privileged ephemeral port number "
2320: "to assign"),
1.189 atatat 2321: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2322: CTL_NET, PF_INET, IPPROTO_IP,
2323: IPCTL_LOWPORTMAX, CTL_EOL);
2324: #endif /* IPNOPRIVPORTS */
1.197 atatat 2325: sysctl_createv(clog, 0, NULL, NULL,
2326: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2327: CTLTYPE_INT, "maxfragpackets",
2328: SYSCTL_DESCR("Maximum number of fragments to retain for "
2329: "possible reassembly"),
1.189 atatat 2330: NULL, 0, &ip_maxfragpackets, 0,
2331: CTL_NET, PF_INET, IPPROTO_IP,
2332: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2333: #if NGRE > 0
1.197 atatat 2334: sysctl_createv(clog, 0, NULL, NULL,
2335: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2336: CTLTYPE_INT, "grettl",
2337: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2338: NULL, 0, &ip_gre_ttl, 0,
2339: CTL_NET, PF_INET, IPPROTO_IP,
2340: IPCTL_GRE_TTL, CTL_EOL);
2341: #endif /* NGRE */
1.197 atatat 2342: sysctl_createv(clog, 0, NULL, NULL,
2343: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2344: CTLTYPE_INT, "checkinterface",
2345: SYSCTL_DESCR("Enable receive side of Strong ES model "
2346: "from RFC1122"),
1.189 atatat 2347: NULL, 0, &ip_checkinterface, 0,
2348: CTL_NET, PF_INET, IPPROTO_IP,
2349: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2350: sysctl_createv(clog, 0, NULL, NULL,
2351: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2352: CTLTYPE_INT, "random_id",
2353: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2354: NULL, 0, &ip_do_randomid, 0,
2355: CTL_NET, PF_INET, IPPROTO_IP,
2356: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2357: sysctl_createv(clog, 0, NULL, NULL,
2358: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2359: CTLTYPE_INT, "do_loopback_cksum",
2360: SYSCTL_DESCR("Perform IP checksum on loopback"),
2361: NULL, 0, &ip_do_loopback_cksum, 0,
2362: CTL_NET, PF_INET, IPPROTO_IP,
2363: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2364: sysctl_createv(clog, 0, NULL, NULL,
2365: CTLFLAG_PERMANENT,
2366: CTLTYPE_STRUCT, "stats",
2367: SYSCTL_DESCR("IP statistics"),
2368: NULL, 0, &ipstat, sizeof(ipstat),
2369: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2370: CTL_EOL);
1.1 cgd 2371: }
CVSweb <webmaster@jp.NetBSD.org>