Annotation of src/sys/netinet/ip_input.c, Revision 1.224.2.4
1.224.2.4! yamt 1: /* $NetBSD: ip_input.c,v 1.224.2.3 2006/08/11 15:46:33 yamt 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>
1.224.2.4! yamt 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.224.2.3 2006/08/11 15:46:33 yamt 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:
1.224.2.2 yamt 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:
1.224.2.4! yamt 448: struct sockaddr_in ipaddr = {
! 449: .sin_len = sizeof(ipaddr),
! 450: .sin_family = AF_INET,
! 451: };
1.1 cgd 452: struct route ipforward_rt;
453:
454: /*
1.89 itojun 455: * IP software interrupt routine
456: */
457: void
1.211 perry 458: ipintr(void)
1.89 itojun 459: {
460: int s;
461: struct mbuf *m;
462:
463: while (1) {
1.132 thorpej 464: s = splnet();
1.89 itojun 465: IF_DEQUEUE(&ipintrq, m);
466: splx(s);
467: if (m == 0)
468: return;
1.164 matt 469: MCLAIM(m, &ip_rx_mowner);
1.89 itojun 470: ip_input(m);
471: }
472: }
473:
474: /*
1.1 cgd 475: * Ip input routine. Checksum and byte swap header. If fragmented
476: * try to reassemble. Process options. Pass to next level.
477: */
1.8 mycroft 478: void
1.89 itojun 479: ip_input(struct mbuf *m)
1.1 cgd 480: {
1.109 augustss 481: struct ip *ip = NULL;
482: struct ipq *fp;
483: struct in_ifaddr *ia;
484: struct ifaddr *ifa;
1.25 cgd 485: struct ipqent *ipqe;
1.89 itojun 486: int hlen = 0, mff, len;
1.100 itojun 487: int downmatch;
1.165 christos 488: int checkif;
1.169 itojun 489: int srcrt = 0;
1.190 jonathan 490: u_int hash;
1.173 jonathan 491: #ifdef FAST_IPSEC
492: struct m_tag *mtag;
493: struct tdb_ident *tdbi;
494: struct secpolicy *sp;
495: int s, error;
496: #endif /* FAST_IPSEC */
1.1 cgd 497:
1.164 matt 498: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 499: #ifdef DIAGNOSTIC
500: if ((m->m_flags & M_PKTHDR) == 0)
501: panic("ipintr no HDR");
1.89 itojun 502: #endif
1.164 matt 503:
1.1 cgd 504: /*
505: * If no IP addresses have been set yet but the interfaces
506: * are receiving, can't do anything with incoming packets yet.
507: */
1.181 jonathan 508: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 509: goto bad;
510: ipstat.ips_total++;
1.154 thorpej 511: /*
512: * If the IP header is not aligned, slurp it up into a new
513: * mbuf with space for link headers, in the event we forward
514: * it. Otherwise, if it is aligned, make sure the entire
515: * base IP header is in the first mbuf of the chain.
516: */
517: if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
518: if ((m = m_copyup(m, sizeof(struct ip),
519: (max_linkhdr + 3) & ~3)) == NULL) {
520: /* XXXJRT new stat, please */
521: ipstat.ips_toosmall++;
522: return;
523: }
524: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
525: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
526: ipstat.ips_toosmall++;
527: return;
528: }
1.1 cgd 529: }
530: ip = mtod(m, struct ip *);
1.13 mycroft 531: if (ip->ip_v != IPVERSION) {
532: ipstat.ips_badvers++;
533: goto bad;
534: }
1.1 cgd 535: hlen = ip->ip_hl << 2;
536: if (hlen < sizeof(struct ip)) { /* minimum header length */
537: ipstat.ips_badhlen++;
538: goto bad;
539: }
540: if (hlen > m->m_len) {
541: if ((m = m_pullup(m, hlen)) == 0) {
542: ipstat.ips_badhlen++;
1.89 itojun 543: return;
1.1 cgd 544: }
545: ip = mtod(m, struct ip *);
546: }
1.98 thorpej 547:
1.85 hwr 548: /*
1.99 thorpej 549: * RFC1122: packets with a multicast source address are
1.98 thorpej 550: * not allowed.
1.85 hwr 551: */
552: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 553: ipstat.ips_badaddr++;
1.85 hwr 554: goto bad;
1.129 itojun 555: }
556:
557: /* 127/8 must not appear on wire - RFC1122 */
558: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
559: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 560: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
561: ipstat.ips_badaddr++;
1.129 itojun 562: goto bad;
1.130 itojun 563: }
1.85 hwr 564: }
565:
1.135 thorpej 566: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 567: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 568: M_CSUM_IPv4_BAD)) {
569: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
570: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
571: goto badcsum;
572:
573: case M_CSUM_IPv4:
574: /* Checksum was okay. */
575: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
576: break;
577:
578: default:
1.206 thorpej 579: /*
580: * Must compute it ourselves. Maybe skip checksum on
581: * loopback interfaces.
582: */
583: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
584: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
585: INET_CSUM_COUNTER_INCR(&ip_swcsum);
586: if (in_cksum(m, hlen) != 0)
587: goto badcsum;
588: }
1.135 thorpej 589: break;
1.1 cgd 590: }
591:
1.121 thorpej 592: /* Retrieve the packet length. */
593: len = ntohs(ip->ip_len);
1.81 proff 594:
595: /*
596: * Check for additional length bogosity
597: */
1.84 proff 598: if (len < hlen) {
1.81 proff 599: ipstat.ips_badlen++;
600: goto bad;
601: }
1.1 cgd 602:
603: /*
604: * Check that the amount of data in the buffers
605: * is as at least much as the IP header would have us expect.
606: * Trim mbufs if longer than we expect.
607: * Drop packet if shorter than we expect.
608: */
1.35 mycroft 609: if (m->m_pkthdr.len < len) {
1.1 cgd 610: ipstat.ips_tooshort++;
611: goto bad;
612: }
1.35 mycroft 613: if (m->m_pkthdr.len > len) {
1.1 cgd 614: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 615: m->m_len = len;
616: m->m_pkthdr.len = len;
1.1 cgd 617: } else
1.35 mycroft 618: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 619: }
620:
1.193 scw 621: #if defined(IPSEC)
1.149 wiz 622: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 623: m->m_flags &= ~M_CANFASTFWD;
624: #else
1.64 thorpej 625: /*
626: * Assume that we can create a fast-forward IP flow entry
627: * based on this packet.
628: */
629: m->m_flags |= M_CANFASTFWD;
1.94 itojun 630: #endif
1.64 thorpej 631:
1.36 mrg 632: #ifdef PFIL_HOOKS
1.33 mrg 633: /*
1.64 thorpej 634: * Run through list of hooks for input packets. If there are any
635: * filters which require that additional packets in the flow are
636: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
637: * Note that filters must _never_ set this flag, as another filter
638: * in the list may have previously cleared it.
1.33 mrg 639: */
1.127 itojun 640: /*
641: * let ipfilter look at packet on the wire,
642: * not the decapsulated packet.
643: */
644: #ifdef IPSEC
1.136 itojun 645: if (!ipsec_getnhist(m))
1.186 scw 646: #elif defined(FAST_IPSEC)
647: if (!ipsec_indone(m))
1.127 itojun 648: #else
649: if (1)
650: #endif
651: {
1.169 itojun 652: struct in_addr odst;
653:
654: odst = ip->ip_dst;
1.127 itojun 655: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 656: PFIL_IN) != 0)
657: return;
1.127 itojun 658: if (m == NULL)
659: return;
660: ip = mtod(m, struct ip *);
1.142 darrenr 661: hlen = ip->ip_hl << 2;
1.205 darrenr 662: /*
663: * XXX The setting of "srcrt" here is to prevent ip_forward()
664: * from generating ICMP redirects for packets that have
665: * been redirected by a hook back out on to the same LAN that
666: * they came from and is not an indication that the packet
667: * is being inffluenced by source routing options. This
668: * allows things like
669: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
670: * where tlp0 is both on the 1.1.1.0/24 network and is the
671: * default route for hosts on 1.1.1.0/24. Of course this
672: * also requires a "map tlp0 ..." to complete the story.
673: * One might argue whether or not this kind of network config.
1.212 perry 674: * should be supported in this manner...
1.205 darrenr 675: */
1.169 itojun 676: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 677: }
1.36 mrg 678: #endif /* PFIL_HOOKS */
1.123 thorpej 679:
680: #ifdef ALTQ
681: /* XXX Temporary until ALTQ is changed to use a pfil hook */
682: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
683: /* packet dropped by traffic conditioner */
684: return;
685: }
686: #endif
1.121 thorpej 687:
688: /*
1.1 cgd 689: * Process options and, if not destined for us,
690: * ship it on. ip_dooptions returns 1 when an
691: * error was detected (causing an icmp message
692: * to be sent and the original packet to be freed).
693: */
694: ip_nhops = 0; /* for source routed packets */
695: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 696: return;
1.1 cgd 697:
698: /*
1.165 christos 699: * Enable a consistency check between the destination address
700: * and the arrival interface for a unicast packet (the RFC 1122
701: * strong ES model) if IP forwarding is disabled and the packet
702: * is not locally generated.
703: *
704: * XXX - Checking also should be disabled if the destination
705: * address is ipnat'ed to a different interface.
706: *
707: * XXX - Checking is incompatible with IP aliases added
708: * to the loopback interface instead of the interface where
709: * the packets are received.
710: *
711: * XXX - We need to add a per ifaddr flag for this so that
712: * we get finer grain control.
713: */
714: checkif = ip_checkinterface && (ipforwarding == 0) &&
715: (m->m_pkthdr.rcvif != NULL) &&
716: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
717:
718: /*
1.1 cgd 719: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 720: *
721: * Traditional 4.4BSD did not consult IFF_UP at all.
722: * The behavior here is to treat addresses on !IFF_UP interface
723: * as not mine.
1.1 cgd 724: */
1.100 itojun 725: downmatch = 0;
1.140 matt 726: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 727: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 728: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
729: continue;
1.97 itojun 730: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
731: break;
1.100 itojun 732: else
733: downmatch++;
1.97 itojun 734: }
735: }
1.86 thorpej 736: if (ia != NULL)
737: goto ours;
1.224.2.1 yamt 738: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 739: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 740: if (ifa->ifa_addr->sa_family != AF_INET)
741: continue;
1.57 tls 742: ia = ifatoia(ifa);
1.35 mycroft 743: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
744: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 745: /*
746: * Look for all-0's host part (old broadcast addr),
747: * either for subnet or net.
748: */
749: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 750: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 751: goto ours;
1.57 tls 752: /*
753: * An interface with IP address zero accepts
754: * all packets that arrive on that interface.
755: */
756: if (in_nullhost(ia->ia_addr.sin_addr))
757: goto ours;
1.1 cgd 758: }
759: }
1.18 mycroft 760: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 761: struct in_multi *inm;
762: #ifdef MROUTING
763: extern struct socket *ip_mrouter;
1.10 brezak 764:
1.4 hpeyerl 765: if (ip_mrouter) {
766: /*
767: * If we are acting as a multicast router, all
768: * incoming multicast packets are passed to the
769: * kernel-level multicast forwarding function.
770: * The packet is returned (relatively) intact; if
771: * ip_mforward() returns a non-zero value, the packet
772: * must be discarded, else it may be accepted below.
773: *
774: * (The IP ident field is put in the same byte order
775: * as expected when ip_mforward() is called from
776: * ip_output().)
777: */
1.13 mycroft 778: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
779: ipstat.ips_cantforward++;
1.4 hpeyerl 780: m_freem(m);
1.89 itojun 781: return;
1.4 hpeyerl 782: }
783:
784: /*
785: * The process-level routing demon needs to receive
786: * all multicast IGMP packets, whether or not this
787: * host belongs to their destination groups.
788: */
789: if (ip->ip_p == IPPROTO_IGMP)
790: goto ours;
1.13 mycroft 791: ipstat.ips_forward++;
1.4 hpeyerl 792: }
793: #endif
794: /*
795: * See if we belong to the destination multicast group on the
796: * arrival interface.
797: */
798: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
799: if (inm == NULL) {
1.13 mycroft 800: ipstat.ips_cantforward++;
1.4 hpeyerl 801: m_freem(m);
1.89 itojun 802: return;
1.4 hpeyerl 803: }
804: goto ours;
805: }
1.19 mycroft 806: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 807: in_nullhost(ip->ip_dst))
1.1 cgd 808: goto ours;
809:
810: /*
811: * Not for us; forward if possible and desirable.
812: */
813: if (ipforwarding == 0) {
814: ipstat.ips_cantforward++;
815: m_freem(m);
1.100 itojun 816: } else {
817: /*
818: * If ip_dst matched any of my address on !IFF_UP interface,
819: * and there's no IFF_UP interface that matches ip_dst,
820: * send icmp unreach. Forwarding it will result in in-kernel
821: * forwarding loop till TTL goes to 0.
822: */
823: if (downmatch) {
824: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
825: ipstat.ips_cantforward++;
826: return;
827: }
1.145 itojun 828: #ifdef IPSEC
829: if (ipsec4_in_reject(m, NULL)) {
830: ipsecstat.in_polvio++;
831: goto bad;
832: }
833: #endif
1.173 jonathan 834: #ifdef FAST_IPSEC
835: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
836: s = splsoftnet();
837: if (mtag != NULL) {
838: tdbi = (struct tdb_ident *)(mtag + 1);
839: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
840: } else {
841: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 842: IP_FORWARDING, &error);
1.173 jonathan 843: }
844: if (sp == NULL) { /* NB: can happen if error */
845: splx(s);
846: /*XXX error stat???*/
847: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
848: goto bad;
849: }
850:
851: /*
852: * Check security policy against packet attributes.
853: */
854: error = ipsec_in_reject(sp, m);
855: KEY_FREESP(&sp);
856: splx(s);
857: if (error) {
858: ipstat.ips_cantforward++;
859: goto bad;
1.193 scw 860: }
861:
862: /*
863: * Peek at the outbound SP for this packet to determine if
864: * it's a Fast Forward candidate.
865: */
866: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
867: if (mtag != NULL)
868: m->m_flags &= ~M_CANFASTFWD;
869: else {
870: s = splsoftnet();
871: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
872: (IP_FORWARDING |
873: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
874: &error, NULL);
875: if (sp != NULL) {
876: m->m_flags &= ~M_CANFASTFWD;
877: KEY_FREESP(&sp);
878: }
879: splx(s);
1.173 jonathan 880: }
881: #endif /* FAST_IPSEC */
1.145 itojun 882:
1.169 itojun 883: ip_forward(m, srcrt);
1.100 itojun 884: }
1.89 itojun 885: return;
1.1 cgd 886:
887: ours:
888: /*
889: * If offset or IP_MF are set, must reassemble.
890: * Otherwise, nothing need be done.
891: * (We could look in the reassembly queue to see
892: * if the packet was previously fragmented,
893: * but it's not worth the time; just let them time out.)
894: */
1.155 itojun 895: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
896:
1.1 cgd 897: /*
898: * Look for queue of fragments
899: * of this datagram.
900: */
1.75 thorpej 901: IPQ_LOCK();
1.190 jonathan 902: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
903: /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
904: for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
905: fp = LIST_NEXT(fp, ipq_q)) {
1.1 cgd 906: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 907: in_hosteq(ip->ip_src, fp->ipq_src) &&
908: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 909: ip->ip_p == fp->ipq_p)
910: goto found;
1.190 jonathan 911:
912: }
1.1 cgd 913: fp = 0;
914: found:
915:
916: /*
917: * Adjust ip_len to not reflect header,
1.25 cgd 918: * set ipqe_mff if more fragments are expected,
1.1 cgd 919: * convert offset of this to bytes.
920: */
1.155 itojun 921: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
922: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 923: if (mff) {
1.16 cgd 924: /*
925: * Make sure that fragments have a data length
926: * that's a non-zero multiple of 8 bytes.
927: */
1.155 itojun 928: if (ntohs(ip->ip_len) == 0 ||
929: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 930: ipstat.ips_badfrags++;
1.75 thorpej 931: IPQ_UNLOCK();
1.16 cgd 932: goto bad;
933: }
934: }
1.155 itojun 935: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 936:
937: /*
938: * If datagram marked as having more fragments
939: * or if this is not the first fragment,
940: * attempt reassembly; if it succeeds, proceed.
941: */
1.155 itojun 942: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 943: ipstat.ips_fragments++;
1.72 thorpej 944: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 945: if (ipqe == NULL) {
946: ipstat.ips_rcvmemdrop++;
1.75 thorpej 947: IPQ_UNLOCK();
1.25 cgd 948: goto bad;
949: }
950: ipqe->ipqe_mff = mff;
1.50 thorpej 951: ipqe->ipqe_m = m;
1.25 cgd 952: ipqe->ipqe_ip = ip;
1.190 jonathan 953: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 954: if (m == 0) {
955: IPQ_UNLOCK();
1.89 itojun 956: return;
1.75 thorpej 957: }
1.13 mycroft 958: ipstat.ips_reassembled++;
1.50 thorpej 959: ip = mtod(m, struct ip *);
1.74 thorpej 960: hlen = ip->ip_hl << 2;
1.155 itojun 961: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 962: } else
963: if (fp)
964: ip_freef(fp);
1.75 thorpej 965: IPQ_UNLOCK();
1.79 mycroft 966: }
1.128 itojun 967:
1.173 jonathan 968: #if defined(IPSEC)
1.128 itojun 969: /*
970: * enforce IPsec policy checking if we are seeing last header.
971: * note that we do not visit this with protocols with pcb layer
972: * code - like udp/tcp/raw ip.
973: */
974: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
975: ipsec4_in_reject(m, NULL)) {
976: ipsecstat.in_polvio++;
977: goto bad;
978: }
979: #endif
1.224.2.1 yamt 980: #ifdef FAST_IPSEC
1.173 jonathan 981: /*
982: * enforce IPsec policy checking if we are seeing last header.
983: * note that we do not visit this with protocols with pcb layer
984: * code - like udp/tcp/raw ip.
985: */
986: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
987: /*
988: * Check if the packet has already had IPsec processing
989: * done. If so, then just pass it along. This tag gets
990: * set during AH, ESP, etc. input handling, before the
991: * packet is returned to the ip input queue for delivery.
1.212 perry 992: */
1.173 jonathan 993: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
994: s = splsoftnet();
995: if (mtag != NULL) {
996: tdbi = (struct tdb_ident *)(mtag + 1);
997: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
998: } else {
999: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1000: IP_FORWARDING, &error);
1.173 jonathan 1001: }
1002: if (sp != NULL) {
1003: /*
1004: * Check security policy against packet attributes.
1005: */
1006: error = ipsec_in_reject(sp, m);
1007: KEY_FREESP(&sp);
1008: } else {
1009: /* XXX error stat??? */
1010: error = EINVAL;
1011: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1012: goto bad;
1013: }
1014: splx(s);
1015: if (error)
1016: goto bad;
1017: }
1018: #endif /* FAST_IPSEC */
1.1 cgd 1019:
1020: /*
1021: * Switch out to protocol's input routine.
1022: */
1.82 aidan 1023: #if IFA_STATS
1.122 itojun 1024: if (ia && ip)
1.155 itojun 1025: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1026: #endif
1.1 cgd 1027: ipstat.ips_delivered++;
1.89 itojun 1028: {
1029: int off = hlen, nh = ip->ip_p;
1030:
1031: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1032: return;
1033: }
1.1 cgd 1034: bad:
1035: m_freem(m);
1.135 thorpej 1036: return;
1037:
1038: badcsum:
1039: ipstat.ips_badsum++;
1040: m_freem(m);
1.1 cgd 1041: }
1042:
1043: /*
1044: * Take incoming datagram fragment and try to
1045: * reassemble it into whole datagram. If a chain for
1046: * reassembly of this datagram already exists, then it
1047: * is given as fp; otherwise have to make a chain.
1048: */
1.50 thorpej 1049: struct mbuf *
1.211 perry 1050: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1051: {
1.109 augustss 1052: struct mbuf *m = ipqe->ipqe_m;
1053: struct ipqent *nq, *p, *q;
1.25 cgd 1054: struct ip *ip;
1.1 cgd 1055: struct mbuf *t;
1.25 cgd 1056: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 1057: int i, next;
1058:
1.75 thorpej 1059: IPQ_LOCK_CHECK();
1060:
1.1 cgd 1061: /*
1062: * Presence of header sizes in mbufs
1063: * would confuse code below.
1064: */
1065: m->m_data += hlen;
1066: m->m_len -= hlen;
1067:
1.194 jonathan 1068: #ifdef notyet
1069: /* make sure fragment limit is up-to-date */
1070: CHECK_NMBCLUSTER_PARAMS();
1071:
1072: /* If we have too many fragments, drop the older half. */
1073: if (ip_nfrags >= ip_maxfrags)
1074: ip_reass_drophalf(void);
1075: #endif
1076:
1.1 cgd 1077: /*
1.192 jonathan 1078: * We are about to add a fragment; increment frag count.
1079: */
1080: ip_nfrags++;
1.212 perry 1081:
1.192 jonathan 1082: /*
1.1 cgd 1083: * If first fragment to arrive, create a reassembly queue.
1084: */
1085: if (fp == 0) {
1.131 itojun 1086: /*
1087: * Enforce upper bound on number of fragmented packets
1088: * for which we attempt reassembly;
1089: * If maxfrag is 0, never accept fragments.
1090: * If maxfrag is -1, accept all fragments without limitation.
1091: */
1092: if (ip_maxfragpackets < 0)
1093: ;
1094: else if (ip_nfragpackets >= ip_maxfragpackets)
1095: goto dropfrag;
1096: ip_nfragpackets++;
1.50 thorpej 1097: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1098: M_FTABLE, M_NOWAIT);
1099: if (fp == NULL)
1.1 cgd 1100: goto dropfrag;
1.190 jonathan 1101: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1102: fp->ipq_nfrags = 1;
1.1 cgd 1103: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1104: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1105: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1106: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1107: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1108: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1109: p = NULL;
1.1 cgd 1110: goto insert;
1.192 jonathan 1111: } else {
1112: fp->ipq_nfrags++;
1.1 cgd 1113: }
1114:
1115: /*
1116: * Find a segment which begins after this one does.
1117: */
1.148 matt 1118: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1119: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1120: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1121: break;
1122:
1123: /*
1124: * If there is a preceding segment, it may provide some of
1125: * our data already. If so, drop the data from the incoming
1126: * segment. If it provides all of our data, drop us.
1127: */
1.25 cgd 1128: if (p != NULL) {
1.155 itojun 1129: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1130: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1131: if (i > 0) {
1.155 itojun 1132: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1133: goto dropfrag;
1.50 thorpej 1134: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1135: ipqe->ipqe_ip->ip_off =
1136: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1137: ipqe->ipqe_ip->ip_len =
1138: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1139: }
1140: }
1141:
1142: /*
1143: * While we overlap succeeding segments trim them or,
1144: * if they are completely covered, dequeue them.
1145: */
1.155 itojun 1146: for (; q != NULL &&
1147: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1148: ntohs(q->ipqe_ip->ip_off); q = nq) {
1149: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1150: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1151: if (i < ntohs(q->ipqe_ip->ip_len)) {
1152: q->ipqe_ip->ip_len =
1153: htons(ntohs(q->ipqe_ip->ip_len) - i);
1154: q->ipqe_ip->ip_off =
1155: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1156: m_adj(q->ipqe_m, i);
1.1 cgd 1157: break;
1158: }
1.148 matt 1159: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1160: m_freem(q->ipqe_m);
1.148 matt 1161: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1162: pool_put(&ipqent_pool, q);
1.192 jonathan 1163: fp->ipq_nfrags--;
1164: ip_nfrags--;
1.1 cgd 1165: }
1166:
1167: insert:
1168: /*
1169: * Stick new segment in its place;
1170: * check for complete reassembly.
1171: */
1.25 cgd 1172: if (p == NULL) {
1.148 matt 1173: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1174: } else {
1.148 matt 1175: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1176: }
1.1 cgd 1177: next = 0;
1.148 matt 1178: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1179: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1180: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1181: return (0);
1.155 itojun 1182: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1183: }
1.25 cgd 1184: if (p->ipqe_mff)
1.1 cgd 1185: return (0);
1186:
1187: /*
1.41 thorpej 1188: * Reassembly is complete. Check for a bogus message size and
1189: * concatenate fragments.
1.1 cgd 1190: */
1.148 matt 1191: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1192: ip = q->ipqe_ip;
1.41 thorpej 1193: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1194: ipstat.ips_toolong++;
1195: ip_freef(fp);
1196: return (0);
1197: }
1.50 thorpej 1198: m = q->ipqe_m;
1.1 cgd 1199: t = m->m_next;
1200: m->m_next = 0;
1201: m_cat(m, t);
1.148 matt 1202: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1203: pool_put(&ipqent_pool, q);
1.25 cgd 1204: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1205: t = q->ipqe_m;
1.148 matt 1206: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1207: pool_put(&ipqent_pool, q);
1.1 cgd 1208: m_cat(m, t);
1209: }
1.192 jonathan 1210: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1211:
1212: /*
1213: * Create header for new ip packet by
1214: * modifying header of first packet;
1215: * dequeue and discard fragment reassembly header.
1216: * Make header visible.
1217: */
1.155 itojun 1218: ip->ip_len = htons(next);
1.25 cgd 1219: ip->ip_src = fp->ipq_src;
1220: ip->ip_dst = fp->ipq_dst;
1221: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1222: FREE(fp, M_FTABLE);
1.131 itojun 1223: ip_nfragpackets--;
1.1 cgd 1224: m->m_len += (ip->ip_hl << 2);
1225: m->m_data -= (ip->ip_hl << 2);
1226: /* some debugging cruft by sklower, below, will go away soon */
1227: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1228: int plen = 0;
1.50 thorpej 1229: for (t = m; t; t = t->m_next)
1230: plen += t->m_len;
1231: m->m_pkthdr.len = plen;
1.213 yamt 1232: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1233: }
1.50 thorpej 1234: return (m);
1.1 cgd 1235:
1236: dropfrag:
1.192 jonathan 1237: if (fp != 0)
1238: fp->ipq_nfrags--;
1239: ip_nfrags--;
1.1 cgd 1240: ipstat.ips_fragdropped++;
1241: m_freem(m);
1.72 thorpej 1242: pool_put(&ipqent_pool, ipqe);
1.1 cgd 1243: return (0);
1244: }
1245:
1246: /*
1247: * Free a fragment reassembly header and all
1248: * associated datagrams.
1249: */
1.8 mycroft 1250: void
1.211 perry 1251: ip_freef(struct ipq *fp)
1.1 cgd 1252: {
1.109 augustss 1253: struct ipqent *q, *p;
1.192 jonathan 1254: u_int nfrags = 0;
1.1 cgd 1255:
1.75 thorpej 1256: IPQ_LOCK_CHECK();
1257:
1.148 matt 1258: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1259: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1260: m_freem(q->ipqe_m);
1.192 jonathan 1261: nfrags++;
1.148 matt 1262: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1263: pool_put(&ipqent_pool, q);
1.1 cgd 1264: }
1.192 jonathan 1265:
1266: if (nfrags != fp->ipq_nfrags)
1267: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1268: ip_nfrags -= nfrags;
1.25 cgd 1269: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1270: FREE(fp, M_FTABLE);
1.131 itojun 1271: ip_nfragpackets--;
1.1 cgd 1272: }
1273:
1274: /*
1.194 jonathan 1275: * IP reassembly TTL machinery for multiplicative drop.
1276: */
1277: static u_int fragttl_histo[(IPFRAGTTL+1)];
1278:
1279:
1280: /*
1281: * Decrement TTL of all reasembly queue entries by `ticks'.
1282: * Count number of distinct fragments (as opposed to partial, fragmented
1283: * datagrams) in the reassembly queue. While we traverse the entire
1284: * reassembly queue, compute and return the median TTL over all fragments.
1285: */
1286: static u_int
1287: ip_reass_ttl_decr(u_int ticks)
1288: {
1.198 matt 1289: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1290: struct ipq *fp, *nfp;
1.198 matt 1291: int i;
1.212 perry 1292:
1.194 jonathan 1293: nfrags = 0;
1294: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1295:
1.194 jonathan 1296: for (i = 0; i < IPREASS_NHASH; i++) {
1297: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1298: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1299: 0 : fp->ipq_ttl - ticks);
1300: nfp = LIST_NEXT(fp, ipq_q);
1301: if (fp->ipq_ttl == 0) {
1302: ipstat.ips_fragtimeout++;
1303: ip_freef(fp);
1304: } else {
1305: nfrags += fp->ipq_nfrags;
1306: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1307: }
1308: }
1309: }
1310:
1311: KASSERT(ip_nfrags == nfrags);
1312:
1313: /* Find median (or other drop fraction) in histogram. */
1314: dropfraction = (ip_nfrags / 2);
1315: keepfraction = ip_nfrags - dropfraction;
1316: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1317: median += fragttl_histo[i];
1318: if (median >= keepfraction)
1319: break;
1320: }
1321:
1322: /* Return TTL of median (or other fraction). */
1323: return (u_int)i;
1324: }
1325:
1326: void
1327: ip_reass_drophalf(void)
1328: {
1329:
1330: u_int median_ticks;
1331: /*
1332: * Compute median TTL of all fragments, and count frags
1333: * with that TTL or lower (roughly half of all fragments).
1334: */
1335: median_ticks = ip_reass_ttl_decr(0);
1336:
1337: /* Drop half. */
1338: median_ticks = ip_reass_ttl_decr(median_ticks);
1339:
1340: }
1341:
1342: /*
1.1 cgd 1343: * IP timer processing;
1344: * if a timer expires on a reassembly
1345: * queue, discard it.
1346: */
1.8 mycroft 1347: void
1.211 perry 1348: ip_slowtimo(void)
1.1 cgd 1349: {
1.191 jonathan 1350: static u_int dropscanidx = 0;
1351: u_int i;
1.194 jonathan 1352: u_int median_ttl;
1.24 mycroft 1353: int s = splsoftnet();
1.1 cgd 1354:
1.75 thorpej 1355: IPQ_LOCK();
1.194 jonathan 1356:
1357: /* Age TTL of all fragments by 1 tick .*/
1358: median_ttl = ip_reass_ttl_decr(1);
1359:
1360: /* make sure fragment limit is up-to-date */
1361: CHECK_NMBCLUSTER_PARAMS();
1362:
1363: /* If we have too many fragments, drop the older half. */
1364: if (ip_nfrags > ip_maxfrags)
1365: ip_reass_ttl_decr(median_ttl);
1366:
1.131 itojun 1367: /*
1.194 jonathan 1368: * If we are over the maximum number of fragmented packets
1.131 itojun 1369: * (due to the limit being lowered), drain off
1.190 jonathan 1370: * enough to get down to the new limit. Start draining
1371: * from the reassembly hashqueue most recently drained.
1.131 itojun 1372: */
1373: if (ip_maxfragpackets < 0)
1374: ;
1375: else {
1.190 jonathan 1376: int wrapped = 0;
1377:
1378: i = dropscanidx;
1379: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1380: while (LIST_FIRST(&ipq[i]) != NULL)
1381: ip_freef(LIST_FIRST(&ipq[i]));
1382: if (++i >= IPREASS_NHASH) {
1383: i = 0;
1384: }
1385: /*
1386: * Dont scan forever even if fragment counters are
1387: * wrong: stop after scanning entire reassembly queue.
1388: */
1389: if (i == dropscanidx)
1390: wrapped = 1;
1391: }
1392: dropscanidx = i;
1.131 itojun 1393: }
1.75 thorpej 1394: IPQ_UNLOCK();
1.63 matt 1395: #ifdef GATEWAY
1396: ipflow_slowtimo();
1397: #endif
1.1 cgd 1398: splx(s);
1399: }
1400:
1401: /*
1402: * Drain off all datagram fragments.
1403: */
1.8 mycroft 1404: void
1.211 perry 1405: ip_drain(void)
1.1 cgd 1406: {
1407:
1.75 thorpej 1408: /*
1409: * We may be called from a device's interrupt context. If
1410: * the ipq is already busy, just bail out now.
1411: */
1412: if (ipq_lock_try() == 0)
1413: return;
1414:
1.194 jonathan 1415: /*
1416: * Drop half the total fragments now. If more mbufs are needed,
1417: * we will be called again soon.
1418: */
1419: ip_reass_drophalf();
1.75 thorpej 1420:
1421: IPQ_UNLOCK();
1.1 cgd 1422: }
1423:
1424: /*
1425: * Do option processing on a datagram,
1426: * possibly discarding it if bad options are encountered,
1427: * or forwarding it if source-routed.
1428: * Returns 1 if packet has been forwarded/freed,
1429: * 0 if the packet should be processed further.
1430: */
1.8 mycroft 1431: int
1.211 perry 1432: ip_dooptions(struct mbuf *m)
1.1 cgd 1433: {
1.109 augustss 1434: struct ip *ip = mtod(m, struct ip *);
1435: u_char *cp, *cp0;
1436: struct ip_timestamp *ipt;
1437: struct in_ifaddr *ia;
1.1 cgd 1438: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1439: struct in_addr dst;
1.1 cgd 1440: n_time ntime;
1441:
1.13 mycroft 1442: dst = ip->ip_dst;
1.1 cgd 1443: cp = (u_char *)(ip + 1);
1444: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1445: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1446: opt = cp[IPOPT_OPTVAL];
1447: if (opt == IPOPT_EOL)
1448: break;
1449: if (opt == IPOPT_NOP)
1450: optlen = 1;
1451: else {
1.113 itojun 1452: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1453: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1454: goto bad;
1455: }
1.1 cgd 1456: optlen = cp[IPOPT_OLEN];
1.114 itojun 1457: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1458: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1459: goto bad;
1460: }
1461: }
1462: switch (opt) {
1463:
1464: default:
1465: break;
1466:
1467: /*
1468: * Source routing with record.
1469: * Find interface with current destination address.
1470: * If none on this machine then drop if strictly routed,
1471: * or do nothing if loosely routed.
1472: * Record interface address and bring up next address
1473: * component. If strictly routed make sure next
1474: * address is on directly accessible net.
1475: */
1476: case IPOPT_LSRR:
1477: case IPOPT_SSRR:
1.47 cjs 1478: if (ip_allowsrcrt == 0) {
1479: type = ICMP_UNREACH;
1480: code = ICMP_UNREACH_NET_PROHIB;
1481: goto bad;
1482: }
1.114 itojun 1483: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1484: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1485: goto bad;
1486: }
1.1 cgd 1487: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1488: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1489: goto bad;
1490: }
1491: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1492: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1493: if (ia == 0) {
1494: if (opt == IPOPT_SSRR) {
1495: type = ICMP_UNREACH;
1496: code = ICMP_UNREACH_SRCFAIL;
1497: goto bad;
1498: }
1499: /*
1500: * Loose routing, and not at next destination
1501: * yet; nothing to do except forward.
1502: */
1503: break;
1504: }
1505: off--; /* 0 origin */
1.112 sommerfe 1506: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1507: /*
1508: * End of source route. Should be for us.
1509: */
1510: save_rte(cp, ip->ip_src);
1511: break;
1512: }
1513: /*
1514: * locate outgoing interface
1515: */
1516: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1517: sizeof(ipaddr.sin_addr));
1.96 thorpej 1518: if (opt == IPOPT_SSRR)
1.196 itojun 1519: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1520: else
1.1 cgd 1521: ia = ip_rtaddr(ipaddr.sin_addr);
1522: if (ia == 0) {
1523: type = ICMP_UNREACH;
1524: code = ICMP_UNREACH_SRCFAIL;
1525: goto bad;
1526: }
1527: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1528: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1529: (caddr_t)(cp + off), sizeof(struct in_addr));
1530: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1531: /*
1532: * Let ip_intr's mcast routing check handle mcast pkts
1533: */
1.18 mycroft 1534: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1535: break;
1536:
1537: case IPOPT_RR:
1.114 itojun 1538: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1539: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1540: goto bad;
1541: }
1.1 cgd 1542: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1543: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1544: goto bad;
1545: }
1546: /*
1547: * If no space remains, ignore.
1548: */
1549: off--; /* 0 origin */
1.112 sommerfe 1550: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1551: break;
1552: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1553: sizeof(ipaddr.sin_addr));
1554: /*
1555: * locate outgoing interface; if we're the destination,
1556: * use the incoming interface (should be same).
1557: */
1.96 thorpej 1558: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1559: == NULL &&
1560: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1561: type = ICMP_UNREACH;
1562: code = ICMP_UNREACH_HOST;
1563: goto bad;
1564: }
1.20 mycroft 1565: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1566: (caddr_t)(cp + off), sizeof(struct in_addr));
1567: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1568: break;
1569:
1570: case IPOPT_TS:
1571: code = cp - (u_char *)ip;
1572: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1573: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1574: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1575: goto bad;
1.114 itojun 1576: }
1577: if (ipt->ipt_ptr < 5) {
1578: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1579: goto bad;
1580: }
1.15 cgd 1581: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1582: if (++ipt->ipt_oflw == 0) {
1583: code = (u_char *)&ipt->ipt_ptr -
1584: (u_char *)ip;
1.1 cgd 1585: goto bad;
1.114 itojun 1586: }
1.1 cgd 1587: break;
1588: }
1.104 thorpej 1589: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1590: switch (ipt->ipt_flg) {
1591:
1592: case IPOPT_TS_TSONLY:
1593: break;
1594:
1595: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1596: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1597: sizeof(struct in_addr) > ipt->ipt_len) {
1598: code = (u_char *)&ipt->ipt_ptr -
1599: (u_char *)ip;
1.1 cgd 1600: goto bad;
1.114 itojun 1601: }
1.13 mycroft 1602: ipaddr.sin_addr = dst;
1.96 thorpej 1603: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1604: m->m_pkthdr.rcvif));
1.13 mycroft 1605: if (ia == 0)
1606: continue;
1.104 thorpej 1607: bcopy(&ia->ia_addr.sin_addr,
1608: cp0, sizeof(struct in_addr));
1.1 cgd 1609: ipt->ipt_ptr += sizeof(struct in_addr);
1610: break;
1611:
1612: case IPOPT_TS_PRESPEC:
1.66 thorpej 1613: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1614: sizeof(struct in_addr) > ipt->ipt_len) {
1615: code = (u_char *)&ipt->ipt_ptr -
1616: (u_char *)ip;
1.1 cgd 1617: goto bad;
1.114 itojun 1618: }
1.104 thorpej 1619: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1620: sizeof(struct in_addr));
1.96 thorpej 1621: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1622: == NULL)
1.1 cgd 1623: continue;
1624: ipt->ipt_ptr += sizeof(struct in_addr);
1625: break;
1626:
1627: default:
1.114 itojun 1628: /* XXX can't take &ipt->ipt_flg */
1629: code = (u_char *)&ipt->ipt_ptr -
1630: (u_char *)ip + 1;
1.1 cgd 1631: goto bad;
1632: }
1633: ntime = iptime();
1.107 thorpej 1634: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1635: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1636: sizeof(n_time));
1637: ipt->ipt_ptr += sizeof(n_time);
1638: }
1639: }
1640: if (forward) {
1.26 thorpej 1641: if (ip_forwsrcrt == 0) {
1642: type = ICMP_UNREACH;
1643: code = ICMP_UNREACH_SRCFAIL;
1644: goto bad;
1645: }
1.1 cgd 1646: ip_forward(m, 1);
1647: return (1);
1.13 mycroft 1648: }
1649: return (0);
1.1 cgd 1650: bad:
1.13 mycroft 1651: icmp_error(m, type, code, 0, 0);
1652: ipstat.ips_badoptions++;
1.1 cgd 1653: return (1);
1654: }
1655:
1656: /*
1657: * Given address of next destination (final or next hop),
1658: * return internet address info of interface to be used to get there.
1659: */
1660: struct in_ifaddr *
1.211 perry 1661: ip_rtaddr(struct in_addr dst)
1.1 cgd 1662: {
1.109 augustss 1663: struct sockaddr_in *sin;
1.1 cgd 1664:
1.19 mycroft 1665: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1666:
1.35 mycroft 1667: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1668: if (ipforward_rt.ro_rt) {
1669: RTFREE(ipforward_rt.ro_rt);
1670: ipforward_rt.ro_rt = 0;
1671: }
1672: sin->sin_family = AF_INET;
1673: sin->sin_len = sizeof(*sin);
1674: sin->sin_addr = dst;
1675:
1676: rtalloc(&ipforward_rt);
1677: }
1678: if (ipforward_rt.ro_rt == 0)
1679: return ((struct in_ifaddr *)0);
1.19 mycroft 1680: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1681: }
1682:
1683: /*
1684: * Save incoming source route for use in replies,
1685: * to be picked up later by ip_srcroute if the receiver is interested.
1686: */
1.13 mycroft 1687: void
1.211 perry 1688: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1689: {
1690: unsigned olen;
1691:
1692: olen = option[IPOPT_OLEN];
1693: #ifdef DIAGNOSTIC
1694: if (ipprintfs)
1.39 christos 1695: printf("save_rte: olen %d\n", olen);
1.89 itojun 1696: #endif /* 0 */
1.1 cgd 1697: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1698: return;
1699: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1700: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1701: ip_srcrt.dst = dst;
1702: }
1703:
1704: /*
1705: * Retrieve incoming source route for use in replies,
1706: * in the same form used by setsockopt.
1707: * The first hop is placed before the options, will be removed later.
1708: */
1709: struct mbuf *
1.211 perry 1710: ip_srcroute(void)
1.1 cgd 1711: {
1.109 augustss 1712: struct in_addr *p, *q;
1713: struct mbuf *m;
1.1 cgd 1714:
1715: if (ip_nhops == 0)
1716: return ((struct mbuf *)0);
1717: m = m_get(M_DONTWAIT, MT_SOOPTS);
1718: if (m == 0)
1719: return ((struct mbuf *)0);
1720:
1.164 matt 1721: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1722: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1723:
1724: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1725: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1726: OPTSIZ;
1727: #ifdef DIAGNOSTIC
1728: if (ipprintfs)
1.39 christos 1729: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1730: #endif
1731:
1732: /*
1733: * First save first hop for return route
1734: */
1735: p = &ip_srcrt.route[ip_nhops - 1];
1736: *(mtod(m, struct in_addr *)) = *p--;
1737: #ifdef DIAGNOSTIC
1738: if (ipprintfs)
1.39 christos 1739: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1740: #endif
1741:
1742: /*
1743: * Copy option fields and padding (nop) to mbuf.
1744: */
1745: ip_srcrt.nop = IPOPT_NOP;
1746: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1747: bcopy((caddr_t)&ip_srcrt.nop,
1748: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1749: q = (struct in_addr *)(mtod(m, caddr_t) +
1750: sizeof(struct in_addr) + OPTSIZ);
1751: #undef OPTSIZ
1752: /*
1753: * Record return path as an IP source route,
1754: * reversing the path (pointers are now aligned).
1755: */
1756: while (p >= ip_srcrt.route) {
1757: #ifdef DIAGNOSTIC
1758: if (ipprintfs)
1.39 christos 1759: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1760: #endif
1761: *q++ = *p--;
1762: }
1763: /*
1764: * Last hop goes to final destination.
1765: */
1766: *q = ip_srcrt.dst;
1767: #ifdef DIAGNOSTIC
1768: if (ipprintfs)
1.39 christos 1769: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1770: #endif
1771: return (m);
1772: }
1773:
1774: /*
1775: * Strip out IP options, at higher
1776: * level protocol in the kernel.
1777: * Second argument is buffer to which options
1778: * will be moved, and return value is their length.
1779: * XXX should be deleted; last arg currently ignored.
1780: */
1.8 mycroft 1781: void
1.211 perry 1782: ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
1.1 cgd 1783: {
1.109 augustss 1784: int i;
1.1 cgd 1785: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1786: caddr_t opts;
1.1 cgd 1787: int olen;
1788:
1.79 mycroft 1789: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1790: opts = (caddr_t)(ip + 1);
1791: i = m->m_len - (sizeof (struct ip) + olen);
1792: bcopy(opts + olen, opts, (unsigned)i);
1793: m->m_len -= olen;
1794: if (m->m_flags & M_PKTHDR)
1795: m->m_pkthdr.len -= olen;
1.155 itojun 1796: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79 mycroft 1797: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1798: }
1799:
1.139 matt 1800: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1801: 0, 0, 0, 0,
1802: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1803: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1804: EMSGSIZE, EHOSTUNREACH, 0, 0,
1805: 0, 0, 0, 0,
1806: ENOPROTOOPT
1807: };
1808:
1809: /*
1810: * Forward a packet. If some error occurs return the sender
1811: * an icmp packet. Note we can't always generate a meaningful
1812: * icmp message because icmp doesn't have a large enough repertoire
1813: * of codes and types.
1814: *
1815: * If not forwarding, just drop the packet. This could be confusing
1816: * if ipforwarding was zero but some routing protocol was advancing
1817: * us as a gateway to somewhere. However, we must let the routing
1818: * protocol deal with that.
1819: *
1820: * The srcrt parameter indicates whether the packet is being forwarded
1821: * via a source route.
1822: */
1.13 mycroft 1823: void
1.211 perry 1824: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1825: {
1.109 augustss 1826: struct ip *ip = mtod(m, struct ip *);
1827: struct sockaddr_in *sin;
1828: struct rtentry *rt;
1.220 christos 1829: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1830: struct mbuf *mcopy;
1.13 mycroft 1831: n_long dest;
1.164 matt 1832:
1833: /*
1834: * We are now in the output path.
1835: */
1836: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1837:
1838: /*
1839: * Clear any in-bound checksum flags for this packet.
1840: */
1841: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1842:
1.13 mycroft 1843: dest = 0;
1.1 cgd 1844: #ifdef DIAGNOSTIC
1.224 joerg 1845: if (ipprintfs) {
1846: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1847: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1848: }
1.1 cgd 1849: #endif
1.93 sommerfe 1850: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1851: ipstat.ips_cantforward++;
1852: m_freem(m);
1853: return;
1854: }
1855: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1856: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1857: return;
1858: }
1859:
1.19 mycroft 1860: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1861: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1862: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1863: if (ipforward_rt.ro_rt) {
1864: RTFREE(ipforward_rt.ro_rt);
1865: ipforward_rt.ro_rt = 0;
1866: }
1867: sin->sin_family = AF_INET;
1.35 mycroft 1868: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1869: sin->sin_addr = ip->ip_dst;
1870:
1871: rtalloc(&ipforward_rt);
1872: if (ipforward_rt.ro_rt == 0) {
1.218 seanb 1873: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.1 cgd 1874: return;
1875: }
1876: rt = ipforward_rt.ro_rt;
1877: }
1878:
1879: /*
1.34 mycroft 1880: * Save at most 68 bytes of the packet in case
1.1 cgd 1881: * we need to generate an ICMP message to the src.
1.119 itojun 1882: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1883: */
1.155 itojun 1884: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1885: if (mcopy)
1886: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1887:
1.221 christos 1888: ip->ip_ttl -= IPTTLDEC;
1889:
1.1 cgd 1890: /*
1891: * If forwarding packet using same interface that it came in on,
1892: * perhaps should send a redirect to sender to shortcut a hop.
1893: * Only send redirect if source is sending directly to us,
1894: * and if packet was not source routed (or has any options).
1895: * Also, don't send redirect if forwarding using a default route
1896: * or a route modified by a redirect.
1897: */
1898: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1899: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1900: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1901: ipsendredirects && !srcrt) {
1.19 mycroft 1902: if (rt->rt_ifa &&
1903: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1904: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1905: if (rt->rt_flags & RTF_GATEWAY)
1906: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1907: else
1908: dest = ip->ip_dst.s_addr;
1909: /*
1910: * Router requirements says to only send host
1911: * redirects.
1912: */
1913: type = ICMP_REDIRECT;
1914: code = ICMP_REDIRECT_HOST;
1.1 cgd 1915: #ifdef DIAGNOSTIC
1.77 thorpej 1916: if (ipprintfs)
1917: printf("redirect (%d) to %x\n", code,
1918: (u_int32_t)dest);
1.1 cgd 1919: #endif
1920: }
1921: }
1922:
1.27 thorpej 1923: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173 jonathan 1924: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1925: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1926:
1.1 cgd 1927: if (error)
1928: ipstat.ips_cantforward++;
1929: else {
1930: ipstat.ips_forward++;
1931: if (type)
1932: ipstat.ips_redirectsent++;
1933: else {
1.63 matt 1934: if (mcopy) {
1935: #ifdef GATEWAY
1.64 thorpej 1936: if (mcopy->m_flags & M_CANFASTFWD)
1937: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1938: #endif
1.1 cgd 1939: m_freem(mcopy);
1.63 matt 1940: }
1.1 cgd 1941: return;
1942: }
1943: }
1944: if (mcopy == NULL)
1945: return;
1.13 mycroft 1946:
1.1 cgd 1947: switch (error) {
1948:
1949: case 0: /* forwarded, but need redirect */
1950: /* type, code set above */
1951: break;
1952:
1953: case ENETUNREACH: /* shouldn't happen, checked above */
1954: case EHOSTUNREACH:
1955: case ENETDOWN:
1956: case EHOSTDOWN:
1957: default:
1958: type = ICMP_UNREACH;
1959: code = ICMP_UNREACH_HOST;
1960: break;
1961:
1962: case EMSGSIZE:
1963: type = ICMP_UNREACH;
1964: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1965: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13 mycroft 1966: if (ipforward_rt.ro_rt)
1.220 christos 1967: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1968: #else
1969: /*
1970: * If the packet is routed over IPsec tunnel, tell the
1971: * originator the tunnel MTU.
1972: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1973: * XXX quickhack!!!
1974: */
1975: if (ipforward_rt.ro_rt) {
1976: struct secpolicy *sp;
1977: int ipsecerror;
1.95 itojun 1978: size_t ipsechdr;
1.89 itojun 1979: struct route *ro;
1980:
1981: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1982: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1983: &ipsecerror);
1.89 itojun 1984:
1985: if (sp == NULL)
1.220 christos 1986: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
1.89 itojun 1987: else {
1988: /* count IPsec header size */
1.95 itojun 1989: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1990: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1991:
1992: /*
1993: * find the correct route for outer IPv4
1994: * header, compute tunnel MTU.
1995: */
1.220 christos 1996:
1.89 itojun 1997: if (sp->req != NULL
1.95 itojun 1998: && sp->req->sav != NULL
1999: && sp->req->sav->sah != NULL) {
2000: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 2001: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1.220 christos 2002: destmtu =
1.151 itojun 2003: ro->ro_rt->rt_rmx.rmx_mtu ?
2004: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 2005: ro->ro_rt->rt_ifp->if_mtu;
1.220 christos 2006: destmtu -= ipsechdr;
1.89 itojun 2007: }
2008: }
2009:
1.173 jonathan 2010: #ifdef IPSEC
1.89 itojun 2011: key_freesp(sp);
1.173 jonathan 2012: #else
2013: KEY_FREESP(&sp);
2014: #endif
1.89 itojun 2015: }
2016: }
2017: #endif /*IPSEC*/
1.1 cgd 2018: ipstat.ips_cantfrag++;
2019: break;
2020:
2021: case ENOBUFS:
1.143 itojun 2022: #if 1
2023: /*
2024: * a router should not generate ICMP_SOURCEQUENCH as
2025: * required in RFC1812 Requirements for IP Version 4 Routers.
2026: * source quench could be a big problem under DoS attacks,
1.149 wiz 2027: * or if the underlying interface is rate-limited.
1.143 itojun 2028: */
2029: if (mcopy)
2030: m_freem(mcopy);
2031: return;
2032: #else
1.1 cgd 2033: type = ICMP_SOURCEQUENCH;
2034: code = 0;
2035: break;
1.143 itojun 2036: #endif
1.1 cgd 2037: }
1.220 christos 2038: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2039: }
2040:
2041: void
1.211 perry 2042: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2043: struct mbuf *m)
1.44 thorpej 2044: {
2045:
2046: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2047: struct timeval tv;
2048:
2049: microtime(&tv);
2050: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
2051: SCM_TIMESTAMP, SOL_SOCKET);
2052: if (*mp)
2053: mp = &(*mp)->m_next;
2054: }
2055: if (inp->inp_flags & INP_RECVDSTADDR) {
2056: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2057: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2058: if (*mp)
2059: mp = &(*mp)->m_next;
2060: }
2061: #ifdef notyet
2062: /*
2063: * XXX
2064: * Moving these out of udp_input() made them even more broken
2065: * than they already were.
2066: * - fenner@parc.xerox.com
2067: */
2068: /* options were tossed already */
2069: if (inp->inp_flags & INP_RECVOPTS) {
2070: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2071: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2072: if (*mp)
2073: mp = &(*mp)->m_next;
2074: }
2075: /* ip_srcroute doesn't do what we want here, need to fix */
2076: if (inp->inp_flags & INP_RECVRETOPTS) {
2077: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2078: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2079: if (*mp)
2080: mp = &(*mp)->m_next;
2081: }
2082: #endif
2083: if (inp->inp_flags & INP_RECVIF) {
2084: struct sockaddr_dl sdl;
2085:
2086: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
2087: sdl.sdl_family = AF_LINK;
2088: sdl.sdl_index = m->m_pkthdr.rcvif ?
2089: m->m_pkthdr.rcvif->if_index : 0;
2090: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
2091: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
2092: IP_RECVIF, IPPROTO_IP);
2093: if (*mp)
2094: mp = &(*mp)->m_next;
2095: }
1.13 mycroft 2096: }
2097:
1.189 atatat 2098: /*
1.224.2.3 yamt 2099: * sysctl helper routine for net.inet.ip.forwsrcrt.
2100: */
2101: static int
2102: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2103: {
2104: int error, tmp;
2105: struct sysctlnode node;
2106:
2107: node = *rnode;
2108: tmp = ip_forwsrcrt;
2109: node.sysctl_data = &tmp;
2110: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2111: if (error || newp == NULL)
2112: return (error);
2113:
2114: if (securelevel > 0)
2115: return (EPERM);
2116:
2117: ip_forwsrcrt = tmp;
2118:
2119: return (0);
2120: }
2121:
2122: /*
1.189 atatat 2123: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2124: * range of the new value and tweaks timers if it changes.
2125: */
2126: static int
2127: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2128: {
1.189 atatat 2129: int error, tmp;
2130: struct sysctlnode node;
2131:
2132: node = *rnode;
2133: tmp = ip_mtudisc_timeout;
2134: node.sysctl_data = &tmp;
2135: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2136: if (error || newp == NULL)
2137: return (error);
2138: if (tmp < 0)
2139: return (EINVAL);
1.52 thorpej 2140:
1.189 atatat 2141: ip_mtudisc_timeout = tmp;
2142: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2143:
2144: return (0);
2145: }
1.54 lukem 2146:
1.65 matt 2147: #ifdef GATEWAY
1.189 atatat 2148: /*
2149: * sysctl helper routine for net.inet.ip.maxflows. apparently if
2150: * maxflows is even looked up, we "reap flows".
2151: */
2152: static int
2153: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2154: {
2155: int s;
1.67 thorpej 2156:
1.217 atatat 2157: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.189 atatat 2158: if (s)
2159: return (s);
1.212 perry 2160:
1.189 atatat 2161: s = splsoftnet();
2162: ipflow_reap(0);
2163: splx(s);
1.144 martin 2164:
1.189 atatat 2165: return (0);
2166: }
2167: #endif /* GATEWAY */
1.117 tron 2168:
1.131 itojun 2169:
1.189 atatat 2170: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2171: {
2172: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2173:
1.197 atatat 2174: sysctl_createv(clog, 0, NULL, NULL,
2175: CTLFLAG_PERMANENT,
1.189 atatat 2176: CTLTYPE_NODE, "net", NULL,
2177: NULL, 0, NULL, 0,
2178: CTL_NET, CTL_EOL);
1.197 atatat 2179: sysctl_createv(clog, 0, NULL, NULL,
2180: CTLFLAG_PERMANENT,
1.203 atatat 2181: CTLTYPE_NODE, "inet",
2182: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2183: NULL, 0, NULL, 0,
2184: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2185: sysctl_createv(clog, 0, NULL, NULL,
2186: CTLFLAG_PERMANENT,
1.203 atatat 2187: CTLTYPE_NODE, "ip",
2188: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2189: NULL, 0, NULL, 0,
2190: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2191:
1.197 atatat 2192: sysctl_createv(clog, 0, NULL, NULL,
2193: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2194: CTLTYPE_INT, "forwarding",
2195: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2196: NULL, 0, &ipforwarding, 0,
2197: CTL_NET, PF_INET, IPPROTO_IP,
2198: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2199: sysctl_createv(clog, 0, NULL, NULL,
2200: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2201: CTLTYPE_INT, "redirect",
2202: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2203: NULL, 0, &ipsendredirects, 0,
2204: CTL_NET, PF_INET, IPPROTO_IP,
2205: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2206: sysctl_createv(clog, 0, NULL, NULL,
2207: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2208: CTLTYPE_INT, "ttl",
2209: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2210: NULL, 0, &ip_defttl, 0,
2211: CTL_NET, PF_INET, IPPROTO_IP,
2212: IPCTL_DEFTTL, CTL_EOL);
2213: #ifdef IPCTL_DEFMTU
1.197 atatat 2214: sysctl_createv(clog, 0, NULL, NULL,
2215: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2216: CTLTYPE_INT, "mtu",
2217: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2218: NULL, 0, &ip_mtu, 0,
2219: CTL_NET, PF_INET, IPPROTO_IP,
2220: IPCTL_DEFMTU, CTL_EOL);
2221: #endif /* IPCTL_DEFMTU */
1.197 atatat 2222: sysctl_createv(clog, 0, NULL, NULL,
1.224.2.3 yamt 2223: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2224: CTLTYPE_INT, "forwsrcrt",
2225: SYSCTL_DESCR("Enable forwarding of source-routed "
2226: "datagrams"),
1.224.2.3 yamt 2227: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2228: CTL_NET, PF_INET, IPPROTO_IP,
2229: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2230: sysctl_createv(clog, 0, NULL, NULL,
2231: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2232: CTLTYPE_INT, "directed-broadcast",
2233: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2234: NULL, 0, &ip_directedbcast, 0,
2235: CTL_NET, PF_INET, IPPROTO_IP,
2236: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2237: sysctl_createv(clog, 0, NULL, NULL,
2238: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2239: CTLTYPE_INT, "allowsrcrt",
2240: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2241: NULL, 0, &ip_allowsrcrt, 0,
2242: CTL_NET, PF_INET, IPPROTO_IP,
2243: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2244: sysctl_createv(clog, 0, NULL, NULL,
2245: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2246: CTLTYPE_INT, "subnetsarelocal",
2247: SYSCTL_DESCR("Whether logical subnets are considered "
2248: "local"),
1.189 atatat 2249: NULL, 0, &subnetsarelocal, 0,
2250: CTL_NET, PF_INET, IPPROTO_IP,
2251: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2252: sysctl_createv(clog, 0, NULL, NULL,
2253: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2254: CTLTYPE_INT, "mtudisc",
2255: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2256: NULL, 0, &ip_mtudisc, 0,
2257: CTL_NET, PF_INET, IPPROTO_IP,
2258: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2259: sysctl_createv(clog, 0, NULL, NULL,
2260: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2261: CTLTYPE_INT, "anonportmin",
2262: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2263: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2264: CTL_NET, PF_INET, IPPROTO_IP,
2265: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2266: sysctl_createv(clog, 0, NULL, NULL,
2267: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2268: CTLTYPE_INT, "anonportmax",
2269: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2270: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2271: CTL_NET, PF_INET, IPPROTO_IP,
2272: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2273: sysctl_createv(clog, 0, NULL, NULL,
2274: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2275: CTLTYPE_INT, "mtudisctimeout",
2276: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2277: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2278: CTL_NET, PF_INET, IPPROTO_IP,
2279: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2280: #ifdef GATEWAY
1.197 atatat 2281: sysctl_createv(clog, 0, NULL, NULL,
2282: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2283: CTLTYPE_INT, "maxflows",
2284: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2285: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2286: CTL_NET, PF_INET, IPPROTO_IP,
2287: IPCTL_MAXFLOWS, CTL_EOL);
2288: #endif /* GATEWAY */
1.197 atatat 2289: sysctl_createv(clog, 0, NULL, NULL,
2290: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2291: CTLTYPE_INT, "hostzerobroadcast",
2292: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2293: NULL, 0, &hostzeroisbroadcast, 0,
2294: CTL_NET, PF_INET, IPPROTO_IP,
2295: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2296: #if NGIF > 0
1.197 atatat 2297: sysctl_createv(clog, 0, NULL, NULL,
2298: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2299: CTLTYPE_INT, "gifttl",
2300: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2301: NULL, 0, &ip_gif_ttl, 0,
2302: CTL_NET, PF_INET, IPPROTO_IP,
2303: IPCTL_GIF_TTL, CTL_EOL);
2304: #endif /* NGIF */
2305: #ifndef IPNOPRIVPORTS
1.197 atatat 2306: sysctl_createv(clog, 0, NULL, NULL,
2307: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2308: CTLTYPE_INT, "lowportmin",
2309: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2310: "to assign"),
1.189 atatat 2311: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2312: CTL_NET, PF_INET, IPPROTO_IP,
2313: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2314: sysctl_createv(clog, 0, NULL, NULL,
2315: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2316: CTLTYPE_INT, "lowportmax",
2317: SYSCTL_DESCR("Highest privileged ephemeral port number "
2318: "to assign"),
1.189 atatat 2319: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2320: CTL_NET, PF_INET, IPPROTO_IP,
2321: IPCTL_LOWPORTMAX, CTL_EOL);
2322: #endif /* IPNOPRIVPORTS */
1.197 atatat 2323: sysctl_createv(clog, 0, NULL, NULL,
2324: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2325: CTLTYPE_INT, "maxfragpackets",
2326: SYSCTL_DESCR("Maximum number of fragments to retain for "
2327: "possible reassembly"),
1.189 atatat 2328: NULL, 0, &ip_maxfragpackets, 0,
2329: CTL_NET, PF_INET, IPPROTO_IP,
2330: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2331: #if NGRE > 0
1.197 atatat 2332: sysctl_createv(clog, 0, NULL, NULL,
2333: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2334: CTLTYPE_INT, "grettl",
2335: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2336: NULL, 0, &ip_gre_ttl, 0,
2337: CTL_NET, PF_INET, IPPROTO_IP,
2338: IPCTL_GRE_TTL, CTL_EOL);
2339: #endif /* NGRE */
1.197 atatat 2340: sysctl_createv(clog, 0, NULL, NULL,
2341: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2342: CTLTYPE_INT, "checkinterface",
2343: SYSCTL_DESCR("Enable receive side of Strong ES model "
2344: "from RFC1122"),
1.189 atatat 2345: NULL, 0, &ip_checkinterface, 0,
2346: CTL_NET, PF_INET, IPPROTO_IP,
2347: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2348: sysctl_createv(clog, 0, NULL, NULL,
2349: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2350: CTLTYPE_INT, "random_id",
2351: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2352: NULL, 0, &ip_do_randomid, 0,
2353: CTL_NET, PF_INET, IPPROTO_IP,
2354: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2355: sysctl_createv(clog, 0, NULL, NULL,
2356: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2357: CTLTYPE_INT, "do_loopback_cksum",
2358: SYSCTL_DESCR("Perform IP checksum on loopback"),
2359: NULL, 0, &ip_do_loopback_cksum, 0,
2360: CTL_NET, PF_INET, IPPROTO_IP,
2361: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2362: sysctl_createv(clog, 0, NULL, NULL,
2363: CTLFLAG_PERMANENT,
2364: CTLTYPE_STRUCT, "stats",
2365: SYSCTL_DESCR("IP statistics"),
2366: NULL, 0, &ipstat, sizeof(ipstat),
2367: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2368: CTL_EOL);
1.1 cgd 2369: }
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