Annotation of src/sys/netinet/ip_input.c, Revision 1.212.2.2.4.1
1.212.2.1 tron 1: /* $NetBSD$ */
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>
1.212.2.1 tron 101: __KERNEL_RCSID(0, "$NetBSD$");
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>
134: #include <netinet/in_var.h>
135: #include <netinet/ip_var.h>
136: #include <netinet/ip_icmp.h>
1.89 itojun 137: /* just for gif_ttl */
138: #include <netinet/in_gif.h>
139: #include "gif.h"
1.144 martin 140: #include <net/if_gre.h>
141: #include "gre.h"
1.111 jdolecek 142:
143: #ifdef MROUTING
144: #include <netinet/ip_mroute.h>
145: #endif
1.89 itojun 146:
147: #ifdef IPSEC
148: #include <netinet6/ipsec.h>
149: #include <netkey/key.h>
150: #endif
1.173 jonathan 151: #ifdef FAST_IPSEC
152: #include <netipsec/ipsec.h>
153: #include <netipsec/key.h>
154: #endif /* FAST_IPSEC*/
1.44 thorpej 155:
1.1 cgd 156: #ifndef IPFORWARDING
157: #ifdef GATEWAY
158: #define IPFORWARDING 1 /* forward IP packets not for us */
159: #else /* GATEWAY */
160: #define IPFORWARDING 0 /* don't forward IP packets not for us */
161: #endif /* GATEWAY */
162: #endif /* IPFORWARDING */
163: #ifndef IPSENDREDIRECTS
164: #define IPSENDREDIRECTS 1
165: #endif
1.26 thorpej 166: #ifndef IPFORWSRCRT
1.47 cjs 167: #define IPFORWSRCRT 1 /* forward source-routed packets */
168: #endif
169: #ifndef IPALLOWSRCRT
1.48 mrg 170: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 171: #endif
1.53 kml 172: #ifndef IPMTUDISC
1.153 itojun 173: #define IPMTUDISC 1
1.53 kml 174: #endif
1.60 kml 175: #ifndef IPMTUDISCTIMEOUT
1.61 kml 176: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 177: #endif
1.53 kml 178:
1.27 thorpej 179: /*
180: * Note: DIRECTED_BROADCAST is handled this way so that previous
181: * configuration using this option will Just Work.
182: */
183: #ifndef IPDIRECTEDBCAST
184: #ifdef DIRECTED_BROADCAST
185: #define IPDIRECTEDBCAST 1
186: #else
187: #define IPDIRECTEDBCAST 0
188: #endif /* DIRECTED_BROADCAST */
189: #endif /* IPDIRECTEDBCAST */
1.1 cgd 190: int ipforwarding = IPFORWARDING;
191: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 192: int ip_defttl = IPDEFTTL;
1.26 thorpej 193: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 194: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 195: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 196: int ip_mtudisc = IPMTUDISC;
1.156 itojun 197: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 198: #ifdef DIAGNOSTIC
199: int ipprintfs = 0;
200: #endif
1.184 jonathan 201:
202: int ip_do_randomid = 0;
203:
1.165 christos 204: /*
205: * XXX - Setting ip_checkinterface mostly implements the receive side of
206: * the Strong ES model described in RFC 1122, but since the routing table
207: * and transmit implementation do not implement the Strong ES model,
208: * setting this to 1 results in an odd hybrid.
209: *
210: * XXX - ip_checkinterface currently must be disabled if you use ipnat
211: * to translate the destination address to another local interface.
212: *
213: * XXX - ip_checkinterface must be disabled if you add IP aliases
214: * to the loopback interface instead of the interface where the
215: * packets for those addresses are received.
216: */
217: int ip_checkinterface = 0;
218:
1.1 cgd 219:
1.60 kml 220: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
221:
1.1 cgd 222: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 223: u_long in_ifaddrhash; /* size of hash table - 1 */
224: int in_ifaddrentries; /* total number of addrs */
1.212 perry 225: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 226: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 227: u_long in_multihash; /* size of hash table - 1 */
228: int in_multientries; /* total number of addrs */
229: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 230: struct ifqueue ipintrq;
1.63 matt 231: struct ipstat ipstat;
1.183 jonathan 232: uint16_t ip_id;
1.75 thorpej 233:
1.121 thorpej 234: #ifdef PFIL_HOOKS
235: struct pfil_head inet_pfil_hook;
236: #endif
237:
1.194 jonathan 238: /*
239: * Cached copy of nmbclusters. If nbclusters is different,
240: * recalculate IP parameters derived from nmbclusters.
241: */
242: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 243: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 244:
1.195 thorpej 245: #define CHECK_NMBCLUSTER_PARAMS() \
246: do { \
247: if (__predict_false(ip_nmbclusters != nmbclusters)) \
248: ip_nmbclusters_changed(); \
249: } while (/*CONSTCOND*/0)
1.194 jonathan 250:
1.190 jonathan 251: /* IP datagram reassembly queues (hashed) */
252: #define IPREASS_NHASH_LOG2 6
253: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
254: #define IPREASS_HMASK (IPREASS_NHASH - 1)
255: #define IPREASS_HASH(x,y) \
256: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
257: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 258: int ipq_locked;
1.212 perry 259: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 260: static int ip_nfrags; /* total fragments in reass queues */
261:
262: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
263: int ip_maxfrags; /* limit on fragments. XXX sysctl */
264:
265:
266: /*
267: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
268: * IP reassembly queue buffer managment.
1.212 perry 269: *
1.194 jonathan 270: * We keep a count of total IP fragments (NB: not fragmented packets!)
271: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
272: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
273: * total fragments in reassembly queues.This AIMD policy avoids
274: * repeatedly deleting single packets under heavy fragmentation load
275: * (e.g., from lossy NFS peers).
276: */
1.212 perry 277: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 278: static void ip_reass_drophalf(void);
1.194 jonathan 279:
1.75 thorpej 280:
1.210 perry 281: static __inline int ipq_lock_try(void);
282: static __inline void ipq_unlock(void);
1.75 thorpej 283:
284: static __inline int
1.211 perry 285: ipq_lock_try(void)
1.75 thorpej 286: {
287: int s;
288:
1.132 thorpej 289: /*
1.149 wiz 290: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 291: * mbuf allocation.
292: */
293: s = splvm();
1.75 thorpej 294: if (ipq_locked) {
295: splx(s);
296: return (0);
297: }
298: ipq_locked = 1;
299: splx(s);
300: return (1);
301: }
302:
303: static __inline void
1.211 perry 304: ipq_unlock(void)
1.75 thorpej 305: {
306: int s;
307:
1.132 thorpej 308: s = splvm();
1.75 thorpej 309: ipq_locked = 0;
310: splx(s);
311: }
312:
313: #ifdef DIAGNOSTIC
314: #define IPQ_LOCK() \
315: do { \
316: if (ipq_lock_try() == 0) { \
317: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
318: panic("ipq_lock"); \
319: } \
1.159 perry 320: } while (/*CONSTCOND*/ 0)
1.75 thorpej 321: #define IPQ_LOCK_CHECK() \
322: do { \
323: if (ipq_locked == 0) { \
324: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
325: panic("ipq lock check"); \
326: } \
1.159 perry 327: } while (/*CONSTCOND*/ 0)
1.75 thorpej 328: #else
329: #define IPQ_LOCK() (void) ipq_lock_try()
330: #define IPQ_LOCK_CHECK() /* nothing */
331: #endif
332:
333: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 334:
1.200 simonb 335: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL);
336: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL);
1.72 thorpej 337:
1.135 thorpej 338: #ifdef INET_CSUM_COUNTERS
339: #include <sys/device.h>
340:
341: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
342: NULL, "inet", "hwcsum bad");
343: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
344: NULL, "inet", "hwcsum ok");
345: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
346: NULL, "inet", "swcsum");
347:
348: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
349:
1.201 matt 350: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
351: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
352: EVCNT_ATTACH_STATIC(ip_swcsum);
353:
1.135 thorpej 354: #else
355:
356: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
357:
358: #endif /* INET_CSUM_COUNTERS */
359:
1.1 cgd 360: /*
361: * We need to save the IP options in case a protocol wants to respond
362: * to an incoming packet over the same route if the packet got here
363: * using IP source routing. This allows connection establishment and
364: * maintenance when the remote end is on a network that is not known
365: * to us.
366: */
367: int ip_nhops = 0;
368: static struct ip_srcrt {
369: struct in_addr dst; /* final destination */
370: char nop; /* one NOP to align */
371: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
372: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
373: } ip_srcrt;
374:
1.210 perry 375: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 376:
1.164 matt 377: #ifdef MBUFTRACE
378: struct mowner ip_rx_mowner = { "internet", "rx" };
379: struct mowner ip_tx_mowner = { "internet", "tx" };
380: #endif
381:
1.1 cgd 382: /*
1.194 jonathan 383: * Compute IP limits derived from the value of nmbclusters.
384: */
385: static void
386: ip_nmbclusters_changed(void)
387: {
388: ip_maxfrags = nmbclusters / 4;
389: ip_nmbclusters = nmbclusters;
390: }
391:
392: /*
1.1 cgd 393: * IP initialization: fill in IP protocol switch table.
394: * All protocols not implemented in kernel go to raw IP protocol handler.
395: */
1.8 mycroft 396: void
1.211 perry 397: ip_init(void)
1.1 cgd 398: {
1.199 matt 399: const struct protosw *pr;
1.109 augustss 400: int i;
1.1 cgd 401:
402: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
403: if (pr == 0)
404: panic("ip_init");
405: for (i = 0; i < IPPROTO_MAX; i++)
406: ip_protox[i] = pr - inetsw;
407: for (pr = inetdomain.dom_protosw;
408: pr < inetdomain.dom_protoswNPROTOSW; pr++)
409: if (pr->pr_domain->dom_family == PF_INET &&
410: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
411: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 412:
1.190 jonathan 413: for (i = 0; i < IPREASS_NHASH; i++)
414: LIST_INIT(&ipq[i]);
415:
1.183 jonathan 416: ip_id = time.tv_sec & 0xfffff;
1.194 jonathan 417:
1.1 cgd 418: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 419: ip_nmbclusters_changed();
420:
1.181 jonathan 421: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 422: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
423: M_WAITOK, &in_ifaddrhash);
1.166 matt 424: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
425: M_WAITOK, &in_multihash);
1.160 itojun 426: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 427: #ifdef GATEWAY
428: ipflow_init();
429: #endif
1.121 thorpej 430:
431: #ifdef PFIL_HOOKS
432: /* Register our Packet Filter hook. */
1.126 thorpej 433: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
434: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 435: i = pfil_head_register(&inet_pfil_hook);
436: if (i != 0)
437: printf("ip_init: WARNING: unable to register pfil hook, "
438: "error %d\n", i);
439: #endif /* PFIL_HOOKS */
1.135 thorpej 440:
1.164 matt 441: #ifdef MBUFTRACE
442: MOWNER_ATTACH(&ip_tx_mowner);
443: MOWNER_ATTACH(&ip_rx_mowner);
444: #endif /* MBUFTRACE */
1.1 cgd 445: }
446:
447: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
448: struct route ipforward_rt;
449:
450: /*
1.89 itojun 451: * IP software interrupt routine
452: */
453: void
1.211 perry 454: ipintr(void)
1.89 itojun 455: {
456: int s;
457: struct mbuf *m;
458:
459: while (1) {
1.132 thorpej 460: s = splnet();
1.89 itojun 461: IF_DEQUEUE(&ipintrq, m);
462: splx(s);
463: if (m == 0)
464: return;
1.164 matt 465: MCLAIM(m, &ip_rx_mowner);
1.89 itojun 466: ip_input(m);
467: }
468: }
469:
470: /*
1.1 cgd 471: * Ip input routine. Checksum and byte swap header. If fragmented
472: * try to reassemble. Process options. Pass to next level.
473: */
1.8 mycroft 474: void
1.89 itojun 475: ip_input(struct mbuf *m)
1.1 cgd 476: {
1.109 augustss 477: struct ip *ip = NULL;
478: struct ipq *fp;
479: struct in_ifaddr *ia;
480: struct ifaddr *ifa;
1.25 cgd 481: struct ipqent *ipqe;
1.89 itojun 482: int hlen = 0, mff, len;
1.100 itojun 483: int downmatch;
1.165 christos 484: int checkif;
1.169 itojun 485: int srcrt = 0;
1.190 jonathan 486: u_int hash;
1.173 jonathan 487: #ifdef FAST_IPSEC
488: struct m_tag *mtag;
489: struct tdb_ident *tdbi;
490: struct secpolicy *sp;
491: int s, error;
492: #endif /* FAST_IPSEC */
1.1 cgd 493:
1.164 matt 494: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 495: #ifdef DIAGNOSTIC
496: if ((m->m_flags & M_PKTHDR) == 0)
497: panic("ipintr no HDR");
1.89 itojun 498: #endif
1.164 matt 499:
1.1 cgd 500: /*
501: * If no IP addresses have been set yet but the interfaces
502: * are receiving, can't do anything with incoming packets yet.
503: */
1.181 jonathan 504: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 505: goto bad;
506: ipstat.ips_total++;
1.154 thorpej 507: /*
508: * If the IP header is not aligned, slurp it up into a new
509: * mbuf with space for link headers, in the event we forward
510: * it. Otherwise, if it is aligned, make sure the entire
511: * base IP header is in the first mbuf of the chain.
512: */
513: if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
514: if ((m = m_copyup(m, sizeof(struct ip),
515: (max_linkhdr + 3) & ~3)) == NULL) {
516: /* XXXJRT new stat, please */
517: ipstat.ips_toosmall++;
518: return;
519: }
520: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
521: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
522: ipstat.ips_toosmall++;
523: return;
524: }
1.1 cgd 525: }
526: ip = mtod(m, struct ip *);
1.13 mycroft 527: if (ip->ip_v != IPVERSION) {
528: ipstat.ips_badvers++;
529: goto bad;
530: }
1.1 cgd 531: hlen = ip->ip_hl << 2;
532: if (hlen < sizeof(struct ip)) { /* minimum header length */
533: ipstat.ips_badhlen++;
534: goto bad;
535: }
536: if (hlen > m->m_len) {
537: if ((m = m_pullup(m, hlen)) == 0) {
538: ipstat.ips_badhlen++;
1.89 itojun 539: return;
1.1 cgd 540: }
541: ip = mtod(m, struct ip *);
542: }
1.98 thorpej 543:
1.85 hwr 544: /*
1.99 thorpej 545: * RFC1122: packets with a multicast source address are
1.98 thorpej 546: * not allowed.
1.85 hwr 547: */
548: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 549: ipstat.ips_badaddr++;
1.85 hwr 550: goto bad;
1.129 itojun 551: }
552:
553: /* 127/8 must not appear on wire - RFC1122 */
554: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
555: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 556: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
557: ipstat.ips_badaddr++;
1.129 itojun 558: goto bad;
1.130 itojun 559: }
1.85 hwr 560: }
561:
1.135 thorpej 562: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 563: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 564: M_CSUM_IPv4_BAD)) {
565: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
566: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
567: goto badcsum;
568:
569: case M_CSUM_IPv4:
570: /* Checksum was okay. */
571: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
572: break;
573:
574: default:
1.206 thorpej 575: /*
576: * Must compute it ourselves. Maybe skip checksum on
577: * loopback interfaces.
578: */
579: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
580: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
581: INET_CSUM_COUNTER_INCR(&ip_swcsum);
582: if (in_cksum(m, hlen) != 0)
583: goto badcsum;
584: }
1.135 thorpej 585: break;
1.1 cgd 586: }
587:
1.121 thorpej 588: /* Retrieve the packet length. */
589: len = ntohs(ip->ip_len);
1.81 proff 590:
591: /*
592: * Check for additional length bogosity
593: */
1.84 proff 594: if (len < hlen) {
1.81 proff 595: ipstat.ips_badlen++;
596: goto bad;
597: }
1.1 cgd 598:
599: /*
600: * Check that the amount of data in the buffers
601: * is as at least much as the IP header would have us expect.
602: * Trim mbufs if longer than we expect.
603: * Drop packet if shorter than we expect.
604: */
1.35 mycroft 605: if (m->m_pkthdr.len < len) {
1.1 cgd 606: ipstat.ips_tooshort++;
607: goto bad;
608: }
1.35 mycroft 609: if (m->m_pkthdr.len > len) {
1.1 cgd 610: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 611: m->m_len = len;
612: m->m_pkthdr.len = len;
1.1 cgd 613: } else
1.35 mycroft 614: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 615: }
616:
1.193 scw 617: #if defined(IPSEC)
1.149 wiz 618: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 619: m->m_flags &= ~M_CANFASTFWD;
620: #else
1.64 thorpej 621: /*
622: * Assume that we can create a fast-forward IP flow entry
623: * based on this packet.
624: */
625: m->m_flags |= M_CANFASTFWD;
1.94 itojun 626: #endif
1.64 thorpej 627:
1.36 mrg 628: #ifdef PFIL_HOOKS
1.33 mrg 629: /*
1.64 thorpej 630: * Run through list of hooks for input packets. If there are any
631: * filters which require that additional packets in the flow are
632: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
633: * Note that filters must _never_ set this flag, as another filter
634: * in the list may have previously cleared it.
1.33 mrg 635: */
1.127 itojun 636: /*
637: * let ipfilter look at packet on the wire,
638: * not the decapsulated packet.
639: */
640: #ifdef IPSEC
1.136 itojun 641: if (!ipsec_getnhist(m))
1.186 scw 642: #elif defined(FAST_IPSEC)
643: if (!ipsec_indone(m))
1.127 itojun 644: #else
645: if (1)
646: #endif
647: {
1.169 itojun 648: struct in_addr odst;
649:
650: odst = ip->ip_dst;
1.127 itojun 651: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 652: PFIL_IN) != 0)
653: return;
1.127 itojun 654: if (m == NULL)
655: return;
656: ip = mtod(m, struct ip *);
1.142 darrenr 657: hlen = ip->ip_hl << 2;
1.205 darrenr 658: /*
659: * XXX The setting of "srcrt" here is to prevent ip_forward()
660: * from generating ICMP redirects for packets that have
661: * been redirected by a hook back out on to the same LAN that
662: * they came from and is not an indication that the packet
663: * is being inffluenced by source routing options. This
664: * allows things like
665: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
666: * where tlp0 is both on the 1.1.1.0/24 network and is the
667: * default route for hosts on 1.1.1.0/24. Of course this
668: * also requires a "map tlp0 ..." to complete the story.
669: * One might argue whether or not this kind of network config.
1.212 perry 670: * should be supported in this manner...
1.205 darrenr 671: */
1.169 itojun 672: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 673: }
1.36 mrg 674: #endif /* PFIL_HOOKS */
1.123 thorpej 675:
676: #ifdef ALTQ
677: /* XXX Temporary until ALTQ is changed to use a pfil hook */
678: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
679: /* packet dropped by traffic conditioner */
680: return;
681: }
682: #endif
1.121 thorpej 683:
684: /*
1.1 cgd 685: * Process options and, if not destined for us,
686: * ship it on. ip_dooptions returns 1 when an
687: * error was detected (causing an icmp message
688: * to be sent and the original packet to be freed).
689: */
690: ip_nhops = 0; /* for source routed packets */
691: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 692: return;
1.1 cgd 693:
694: /*
1.165 christos 695: * Enable a consistency check between the destination address
696: * and the arrival interface for a unicast packet (the RFC 1122
697: * strong ES model) if IP forwarding is disabled and the packet
698: * is not locally generated.
699: *
700: * XXX - Checking also should be disabled if the destination
701: * address is ipnat'ed to a different interface.
702: *
703: * XXX - Checking is incompatible with IP aliases added
704: * to the loopback interface instead of the interface where
705: * the packets are received.
706: *
707: * XXX - We need to add a per ifaddr flag for this so that
708: * we get finer grain control.
709: */
710: checkif = ip_checkinterface && (ipforwarding == 0) &&
711: (m->m_pkthdr.rcvif != NULL) &&
712: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
713:
714: /*
1.1 cgd 715: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 716: *
717: * Traditional 4.4BSD did not consult IFF_UP at all.
718: * The behavior here is to treat addresses on !IFF_UP interface
719: * as not mine.
1.1 cgd 720: */
1.100 itojun 721: downmatch = 0;
1.140 matt 722: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 723: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 724: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
725: continue;
1.97 itojun 726: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
727: break;
1.100 itojun 728: else
729: downmatch++;
1.97 itojun 730: }
731: }
1.86 thorpej 732: if (ia != NULL)
733: goto ours;
1.57 tls 734: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 735: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 736: if (ifa->ifa_addr->sa_family != AF_INET)
737: continue;
1.57 tls 738: ia = ifatoia(ifa);
1.35 mycroft 739: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
740: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 741: /*
742: * Look for all-0's host part (old broadcast addr),
743: * either for subnet or net.
744: */
745: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 746: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 747: goto ours;
1.57 tls 748: /*
749: * An interface with IP address zero accepts
750: * all packets that arrive on that interface.
751: */
752: if (in_nullhost(ia->ia_addr.sin_addr))
753: goto ours;
1.1 cgd 754: }
755: }
1.18 mycroft 756: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 757: struct in_multi *inm;
758: #ifdef MROUTING
759: extern struct socket *ip_mrouter;
1.10 brezak 760:
1.4 hpeyerl 761: if (ip_mrouter) {
762: /*
763: * If we are acting as a multicast router, all
764: * incoming multicast packets are passed to the
765: * kernel-level multicast forwarding function.
766: * The packet is returned (relatively) intact; if
767: * ip_mforward() returns a non-zero value, the packet
768: * must be discarded, else it may be accepted below.
769: *
770: * (The IP ident field is put in the same byte order
771: * as expected when ip_mforward() is called from
772: * ip_output().)
773: */
1.13 mycroft 774: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
775: ipstat.ips_cantforward++;
1.4 hpeyerl 776: m_freem(m);
1.89 itojun 777: return;
1.4 hpeyerl 778: }
779:
780: /*
781: * The process-level routing demon needs to receive
782: * all multicast IGMP packets, whether or not this
783: * host belongs to their destination groups.
784: */
785: if (ip->ip_p == IPPROTO_IGMP)
786: goto ours;
1.13 mycroft 787: ipstat.ips_forward++;
1.4 hpeyerl 788: }
789: #endif
790: /*
791: * See if we belong to the destination multicast group on the
792: * arrival interface.
793: */
794: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
795: if (inm == NULL) {
1.13 mycroft 796: ipstat.ips_cantforward++;
1.4 hpeyerl 797: m_freem(m);
1.89 itojun 798: return;
1.4 hpeyerl 799: }
800: goto ours;
801: }
1.19 mycroft 802: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 803: in_nullhost(ip->ip_dst))
1.1 cgd 804: goto ours;
805:
806: /*
807: * Not for us; forward if possible and desirable.
808: */
809: if (ipforwarding == 0) {
810: ipstat.ips_cantforward++;
811: m_freem(m);
1.100 itojun 812: } else {
813: /*
814: * If ip_dst matched any of my address on !IFF_UP interface,
815: * and there's no IFF_UP interface that matches ip_dst,
816: * send icmp unreach. Forwarding it will result in in-kernel
817: * forwarding loop till TTL goes to 0.
818: */
819: if (downmatch) {
820: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
821: ipstat.ips_cantforward++;
822: return;
823: }
1.145 itojun 824: #ifdef IPSEC
825: if (ipsec4_in_reject(m, NULL)) {
826: ipsecstat.in_polvio++;
827: goto bad;
828: }
829: #endif
1.173 jonathan 830: #ifdef FAST_IPSEC
831: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
832: s = splsoftnet();
833: if (mtag != NULL) {
834: tdbi = (struct tdb_ident *)(mtag + 1);
835: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
836: } else {
837: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 838: IP_FORWARDING, &error);
1.173 jonathan 839: }
840: if (sp == NULL) { /* NB: can happen if error */
841: splx(s);
842: /*XXX error stat???*/
843: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
844: goto bad;
845: }
846:
847: /*
848: * Check security policy against packet attributes.
849: */
850: error = ipsec_in_reject(sp, m);
851: KEY_FREESP(&sp);
852: splx(s);
853: if (error) {
854: ipstat.ips_cantforward++;
855: goto bad;
1.193 scw 856: }
857:
858: /*
859: * Peek at the outbound SP for this packet to determine if
860: * it's a Fast Forward candidate.
861: */
862: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
863: if (mtag != NULL)
864: m->m_flags &= ~M_CANFASTFWD;
865: else {
866: s = splsoftnet();
867: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
868: (IP_FORWARDING |
869: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
870: &error, NULL);
871: if (sp != NULL) {
872: m->m_flags &= ~M_CANFASTFWD;
873: KEY_FREESP(&sp);
874: }
875: splx(s);
1.173 jonathan 876: }
877: #endif /* FAST_IPSEC */
1.145 itojun 878:
1.169 itojun 879: ip_forward(m, srcrt);
1.100 itojun 880: }
1.89 itojun 881: return;
1.1 cgd 882:
883: ours:
884: /*
885: * If offset or IP_MF are set, must reassemble.
886: * Otherwise, nothing need be done.
887: * (We could look in the reassembly queue to see
888: * if the packet was previously fragmented,
889: * but it's not worth the time; just let them time out.)
890: */
1.155 itojun 891: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
892:
1.1 cgd 893: /*
894: * Look for queue of fragments
895: * of this datagram.
896: */
1.75 thorpej 897: IPQ_LOCK();
1.190 jonathan 898: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
899: /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
900: for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
901: fp = LIST_NEXT(fp, ipq_q)) {
1.1 cgd 902: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 903: in_hosteq(ip->ip_src, fp->ipq_src) &&
904: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 905: ip->ip_p == fp->ipq_p)
906: goto found;
1.190 jonathan 907:
908: }
1.1 cgd 909: fp = 0;
910: found:
911:
912: /*
913: * Adjust ip_len to not reflect header,
1.25 cgd 914: * set ipqe_mff if more fragments are expected,
1.1 cgd 915: * convert offset of this to bytes.
916: */
1.155 itojun 917: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
918: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 919: if (mff) {
1.16 cgd 920: /*
921: * Make sure that fragments have a data length
922: * that's a non-zero multiple of 8 bytes.
923: */
1.155 itojun 924: if (ntohs(ip->ip_len) == 0 ||
925: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 926: ipstat.ips_badfrags++;
1.75 thorpej 927: IPQ_UNLOCK();
1.16 cgd 928: goto bad;
929: }
930: }
1.155 itojun 931: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 932:
933: /*
934: * If datagram marked as having more fragments
935: * or if this is not the first fragment,
936: * attempt reassembly; if it succeeds, proceed.
937: */
1.155 itojun 938: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 939: ipstat.ips_fragments++;
1.72 thorpej 940: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 941: if (ipqe == NULL) {
942: ipstat.ips_rcvmemdrop++;
1.75 thorpej 943: IPQ_UNLOCK();
1.25 cgd 944: goto bad;
945: }
946: ipqe->ipqe_mff = mff;
1.50 thorpej 947: ipqe->ipqe_m = m;
1.25 cgd 948: ipqe->ipqe_ip = ip;
1.190 jonathan 949: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 950: if (m == 0) {
951: IPQ_UNLOCK();
1.89 itojun 952: return;
1.75 thorpej 953: }
1.13 mycroft 954: ipstat.ips_reassembled++;
1.50 thorpej 955: ip = mtod(m, struct ip *);
1.74 thorpej 956: hlen = ip->ip_hl << 2;
1.155 itojun 957: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 958: } else
959: if (fp)
960: ip_freef(fp);
1.75 thorpej 961: IPQ_UNLOCK();
1.79 mycroft 962: }
1.128 itojun 963:
1.173 jonathan 964: #if defined(IPSEC)
1.128 itojun 965: /*
966: * enforce IPsec policy checking if we are seeing last header.
967: * note that we do not visit this with protocols with pcb layer
968: * code - like udp/tcp/raw ip.
969: */
970: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
971: ipsec4_in_reject(m, NULL)) {
972: ipsecstat.in_polvio++;
973: goto bad;
974: }
975: #endif
1.173 jonathan 976: #if FAST_IPSEC
977: /*
978: * enforce IPsec policy checking if we are seeing last header.
979: * note that we do not visit this with protocols with pcb layer
980: * code - like udp/tcp/raw ip.
981: */
982: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
983: /*
984: * Check if the packet has already had IPsec processing
985: * done. If so, then just pass it along. This tag gets
986: * set during AH, ESP, etc. input handling, before the
987: * packet is returned to the ip input queue for delivery.
1.212 perry 988: */
1.173 jonathan 989: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
990: s = splsoftnet();
991: if (mtag != NULL) {
992: tdbi = (struct tdb_ident *)(mtag + 1);
993: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
994: } else {
995: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 996: IP_FORWARDING, &error);
1.173 jonathan 997: }
998: if (sp != NULL) {
999: /*
1000: * Check security policy against packet attributes.
1001: */
1002: error = ipsec_in_reject(sp, m);
1003: KEY_FREESP(&sp);
1004: } else {
1005: /* XXX error stat??? */
1006: error = EINVAL;
1007: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1008: }
1009: splx(s);
1010: if (error)
1011: goto bad;
1012: }
1013: #endif /* FAST_IPSEC */
1.1 cgd 1014:
1015: /*
1016: * Switch out to protocol's input routine.
1017: */
1.82 aidan 1018: #if IFA_STATS
1.122 itojun 1019: if (ia && ip)
1.155 itojun 1020: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1021: #endif
1.1 cgd 1022: ipstat.ips_delivered++;
1.89 itojun 1023: {
1024: int off = hlen, nh = ip->ip_p;
1025:
1026: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1027: return;
1028: }
1.1 cgd 1029: bad:
1030: m_freem(m);
1.135 thorpej 1031: return;
1032:
1033: badcsum:
1034: ipstat.ips_badsum++;
1035: m_freem(m);
1.1 cgd 1036: }
1037:
1038: /*
1039: * Take incoming datagram fragment and try to
1040: * reassemble it into whole datagram. If a chain for
1041: * reassembly of this datagram already exists, then it
1042: * is given as fp; otherwise have to make a chain.
1043: */
1.50 thorpej 1044: struct mbuf *
1.211 perry 1045: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1046: {
1.109 augustss 1047: struct mbuf *m = ipqe->ipqe_m;
1048: struct ipqent *nq, *p, *q;
1.25 cgd 1049: struct ip *ip;
1.1 cgd 1050: struct mbuf *t;
1.25 cgd 1051: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 1052: int i, next;
1053:
1.75 thorpej 1054: IPQ_LOCK_CHECK();
1055:
1.1 cgd 1056: /*
1057: * Presence of header sizes in mbufs
1058: * would confuse code below.
1059: */
1060: m->m_data += hlen;
1061: m->m_len -= hlen;
1062:
1.194 jonathan 1063: #ifdef notyet
1064: /* make sure fragment limit is up-to-date */
1065: CHECK_NMBCLUSTER_PARAMS();
1066:
1067: /* If we have too many fragments, drop the older half. */
1068: if (ip_nfrags >= ip_maxfrags)
1069: ip_reass_drophalf(void);
1070: #endif
1071:
1.1 cgd 1072: /*
1.192 jonathan 1073: * We are about to add a fragment; increment frag count.
1074: */
1075: ip_nfrags++;
1.212 perry 1076:
1.192 jonathan 1077: /*
1.1 cgd 1078: * If first fragment to arrive, create a reassembly queue.
1079: */
1080: if (fp == 0) {
1.131 itojun 1081: /*
1082: * Enforce upper bound on number of fragmented packets
1083: * for which we attempt reassembly;
1084: * If maxfrag is 0, never accept fragments.
1085: * If maxfrag is -1, accept all fragments without limitation.
1086: */
1087: if (ip_maxfragpackets < 0)
1088: ;
1089: else if (ip_nfragpackets >= ip_maxfragpackets)
1090: goto dropfrag;
1091: ip_nfragpackets++;
1.50 thorpej 1092: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1093: M_FTABLE, M_NOWAIT);
1094: if (fp == NULL)
1.1 cgd 1095: goto dropfrag;
1.190 jonathan 1096: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1097: fp->ipq_nfrags = 1;
1.1 cgd 1098: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1099: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1100: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1101: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1102: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1103: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1104: p = NULL;
1.1 cgd 1105: goto insert;
1.192 jonathan 1106: } else {
1107: fp->ipq_nfrags++;
1.1 cgd 1108: }
1109:
1110: /*
1111: * Find a segment which begins after this one does.
1112: */
1.148 matt 1113: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1114: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1115: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1116: break;
1117:
1118: /*
1119: * If there is a preceding segment, it may provide some of
1120: * our data already. If so, drop the data from the incoming
1121: * segment. If it provides all of our data, drop us.
1122: */
1.25 cgd 1123: if (p != NULL) {
1.155 itojun 1124: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1125: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1126: if (i > 0) {
1.155 itojun 1127: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1128: goto dropfrag;
1.50 thorpej 1129: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1130: ipqe->ipqe_ip->ip_off =
1131: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1132: ipqe->ipqe_ip->ip_len =
1133: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1134: }
1135: }
1136:
1137: /*
1138: * While we overlap succeeding segments trim them or,
1139: * if they are completely covered, dequeue them.
1140: */
1.155 itojun 1141: for (; q != NULL &&
1142: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1143: ntohs(q->ipqe_ip->ip_off); q = nq) {
1144: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1145: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1146: if (i < ntohs(q->ipqe_ip->ip_len)) {
1147: q->ipqe_ip->ip_len =
1148: htons(ntohs(q->ipqe_ip->ip_len) - i);
1149: q->ipqe_ip->ip_off =
1150: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1151: m_adj(q->ipqe_m, i);
1.1 cgd 1152: break;
1153: }
1.148 matt 1154: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1155: m_freem(q->ipqe_m);
1.148 matt 1156: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1157: pool_put(&ipqent_pool, q);
1.192 jonathan 1158: fp->ipq_nfrags--;
1159: ip_nfrags--;
1.1 cgd 1160: }
1161:
1162: insert:
1163: /*
1164: * Stick new segment in its place;
1165: * check for complete reassembly.
1166: */
1.25 cgd 1167: if (p == NULL) {
1.148 matt 1168: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1169: } else {
1.148 matt 1170: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1171: }
1.1 cgd 1172: next = 0;
1.148 matt 1173: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1174: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1175: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1176: return (0);
1.155 itojun 1177: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1178: }
1.25 cgd 1179: if (p->ipqe_mff)
1.1 cgd 1180: return (0);
1181:
1182: /*
1.41 thorpej 1183: * Reassembly is complete. Check for a bogus message size and
1184: * concatenate fragments.
1.1 cgd 1185: */
1.148 matt 1186: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1187: ip = q->ipqe_ip;
1.41 thorpej 1188: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1189: ipstat.ips_toolong++;
1190: ip_freef(fp);
1191: return (0);
1192: }
1.50 thorpej 1193: m = q->ipqe_m;
1.1 cgd 1194: t = m->m_next;
1195: m->m_next = 0;
1196: m_cat(m, t);
1.148 matt 1197: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1198: pool_put(&ipqent_pool, q);
1.25 cgd 1199: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1200: t = q->ipqe_m;
1.148 matt 1201: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1202: pool_put(&ipqent_pool, q);
1.1 cgd 1203: m_cat(m, t);
1204: }
1.192 jonathan 1205: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1206:
1207: /*
1208: * Create header for new ip packet by
1209: * modifying header of first packet;
1210: * dequeue and discard fragment reassembly header.
1211: * Make header visible.
1212: */
1.155 itojun 1213: ip->ip_len = htons(next);
1.25 cgd 1214: ip->ip_src = fp->ipq_src;
1215: ip->ip_dst = fp->ipq_dst;
1216: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1217: FREE(fp, M_FTABLE);
1.131 itojun 1218: ip_nfragpackets--;
1.1 cgd 1219: m->m_len += (ip->ip_hl << 2);
1220: m->m_data -= (ip->ip_hl << 2);
1221: /* some debugging cruft by sklower, below, will go away soon */
1222: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1223: int plen = 0;
1.50 thorpej 1224: for (t = m; t; t = t->m_next)
1225: plen += t->m_len;
1226: m->m_pkthdr.len = plen;
1.212.2.1 tron 1227: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1228: }
1.50 thorpej 1229: return (m);
1.1 cgd 1230:
1231: dropfrag:
1.192 jonathan 1232: if (fp != 0)
1233: fp->ipq_nfrags--;
1234: ip_nfrags--;
1.1 cgd 1235: ipstat.ips_fragdropped++;
1236: m_freem(m);
1.72 thorpej 1237: pool_put(&ipqent_pool, ipqe);
1.1 cgd 1238: return (0);
1239: }
1240:
1241: /*
1242: * Free a fragment reassembly header and all
1243: * associated datagrams.
1244: */
1.8 mycroft 1245: void
1.211 perry 1246: ip_freef(struct ipq *fp)
1.1 cgd 1247: {
1.109 augustss 1248: struct ipqent *q, *p;
1.192 jonathan 1249: u_int nfrags = 0;
1.1 cgd 1250:
1.75 thorpej 1251: IPQ_LOCK_CHECK();
1252:
1.148 matt 1253: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1254: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1255: m_freem(q->ipqe_m);
1.192 jonathan 1256: nfrags++;
1.148 matt 1257: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1258: pool_put(&ipqent_pool, q);
1.1 cgd 1259: }
1.192 jonathan 1260:
1261: if (nfrags != fp->ipq_nfrags)
1262: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1263: ip_nfrags -= nfrags;
1.25 cgd 1264: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1265: FREE(fp, M_FTABLE);
1.131 itojun 1266: ip_nfragpackets--;
1.1 cgd 1267: }
1268:
1269: /*
1.194 jonathan 1270: * IP reassembly TTL machinery for multiplicative drop.
1271: */
1272: static u_int fragttl_histo[(IPFRAGTTL+1)];
1273:
1274:
1275: /*
1276: * Decrement TTL of all reasembly queue entries by `ticks'.
1277: * Count number of distinct fragments (as opposed to partial, fragmented
1278: * datagrams) in the reassembly queue. While we traverse the entire
1279: * reassembly queue, compute and return the median TTL over all fragments.
1280: */
1281: static u_int
1282: ip_reass_ttl_decr(u_int ticks)
1283: {
1.198 matt 1284: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1285: struct ipq *fp, *nfp;
1.198 matt 1286: int i;
1.212 perry 1287:
1.194 jonathan 1288: nfrags = 0;
1289: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1290:
1.194 jonathan 1291: for (i = 0; i < IPREASS_NHASH; i++) {
1292: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1293: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1294: 0 : fp->ipq_ttl - ticks);
1295: nfp = LIST_NEXT(fp, ipq_q);
1296: if (fp->ipq_ttl == 0) {
1297: ipstat.ips_fragtimeout++;
1298: ip_freef(fp);
1299: } else {
1300: nfrags += fp->ipq_nfrags;
1301: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1302: }
1303: }
1304: }
1305:
1306: KASSERT(ip_nfrags == nfrags);
1307:
1308: /* Find median (or other drop fraction) in histogram. */
1309: dropfraction = (ip_nfrags / 2);
1310: keepfraction = ip_nfrags - dropfraction;
1311: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1312: median += fragttl_histo[i];
1313: if (median >= keepfraction)
1314: break;
1315: }
1316:
1317: /* Return TTL of median (or other fraction). */
1318: return (u_int)i;
1319: }
1320:
1321: void
1322: ip_reass_drophalf(void)
1323: {
1324:
1325: u_int median_ticks;
1326: /*
1327: * Compute median TTL of all fragments, and count frags
1328: * with that TTL or lower (roughly half of all fragments).
1329: */
1330: median_ticks = ip_reass_ttl_decr(0);
1331:
1332: /* Drop half. */
1333: median_ticks = ip_reass_ttl_decr(median_ticks);
1334:
1335: }
1336:
1337: /*
1.1 cgd 1338: * IP timer processing;
1339: * if a timer expires on a reassembly
1340: * queue, discard it.
1341: */
1.8 mycroft 1342: void
1.211 perry 1343: ip_slowtimo(void)
1.1 cgd 1344: {
1.191 jonathan 1345: static u_int dropscanidx = 0;
1346: u_int i;
1.194 jonathan 1347: u_int median_ttl;
1.24 mycroft 1348: int s = splsoftnet();
1.1 cgd 1349:
1.75 thorpej 1350: IPQ_LOCK();
1.194 jonathan 1351:
1352: /* Age TTL of all fragments by 1 tick .*/
1353: median_ttl = ip_reass_ttl_decr(1);
1354:
1355: /* make sure fragment limit is up-to-date */
1356: CHECK_NMBCLUSTER_PARAMS();
1357:
1358: /* If we have too many fragments, drop the older half. */
1359: if (ip_nfrags > ip_maxfrags)
1360: ip_reass_ttl_decr(median_ttl);
1361:
1.131 itojun 1362: /*
1.194 jonathan 1363: * If we are over the maximum number of fragmented packets
1.131 itojun 1364: * (due to the limit being lowered), drain off
1.190 jonathan 1365: * enough to get down to the new limit. Start draining
1366: * from the reassembly hashqueue most recently drained.
1.131 itojun 1367: */
1368: if (ip_maxfragpackets < 0)
1369: ;
1370: else {
1.190 jonathan 1371: int wrapped = 0;
1372:
1373: i = dropscanidx;
1374: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1375: while (LIST_FIRST(&ipq[i]) != NULL)
1376: ip_freef(LIST_FIRST(&ipq[i]));
1377: if (++i >= IPREASS_NHASH) {
1378: i = 0;
1379: }
1380: /*
1381: * Dont scan forever even if fragment counters are
1382: * wrong: stop after scanning entire reassembly queue.
1383: */
1384: if (i == dropscanidx)
1385: wrapped = 1;
1386: }
1387: dropscanidx = i;
1.131 itojun 1388: }
1.75 thorpej 1389: IPQ_UNLOCK();
1.63 matt 1390: #ifdef GATEWAY
1391: ipflow_slowtimo();
1392: #endif
1.1 cgd 1393: splx(s);
1394: }
1395:
1396: /*
1397: * Drain off all datagram fragments.
1398: */
1.8 mycroft 1399: void
1.211 perry 1400: ip_drain(void)
1.1 cgd 1401: {
1402:
1.75 thorpej 1403: /*
1404: * We may be called from a device's interrupt context. If
1405: * the ipq is already busy, just bail out now.
1406: */
1407: if (ipq_lock_try() == 0)
1408: return;
1409:
1.194 jonathan 1410: /*
1411: * Drop half the total fragments now. If more mbufs are needed,
1412: * we will be called again soon.
1413: */
1414: ip_reass_drophalf();
1.75 thorpej 1415:
1416: IPQ_UNLOCK();
1.1 cgd 1417: }
1418:
1419: /*
1420: * Do option processing on a datagram,
1421: * possibly discarding it if bad options are encountered,
1422: * or forwarding it if source-routed.
1423: * Returns 1 if packet has been forwarded/freed,
1424: * 0 if the packet should be processed further.
1425: */
1.8 mycroft 1426: int
1.211 perry 1427: ip_dooptions(struct mbuf *m)
1.1 cgd 1428: {
1.109 augustss 1429: struct ip *ip = mtod(m, struct ip *);
1430: u_char *cp, *cp0;
1431: struct ip_timestamp *ipt;
1432: struct in_ifaddr *ia;
1.1 cgd 1433: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1434: struct in_addr dst;
1.1 cgd 1435: n_time ntime;
1436:
1.13 mycroft 1437: dst = ip->ip_dst;
1.1 cgd 1438: cp = (u_char *)(ip + 1);
1439: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1440: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1441: opt = cp[IPOPT_OPTVAL];
1442: if (opt == IPOPT_EOL)
1443: break;
1444: if (opt == IPOPT_NOP)
1445: optlen = 1;
1446: else {
1.113 itojun 1447: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1448: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1449: goto bad;
1450: }
1.1 cgd 1451: optlen = cp[IPOPT_OLEN];
1.114 itojun 1452: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1453: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1454: goto bad;
1455: }
1456: }
1457: switch (opt) {
1458:
1459: default:
1460: break;
1461:
1462: /*
1463: * Source routing with record.
1464: * Find interface with current destination address.
1465: * If none on this machine then drop if strictly routed,
1466: * or do nothing if loosely routed.
1467: * Record interface address and bring up next address
1468: * component. If strictly routed make sure next
1469: * address is on directly accessible net.
1470: */
1471: case IPOPT_LSRR:
1472: case IPOPT_SSRR:
1.47 cjs 1473: if (ip_allowsrcrt == 0) {
1474: type = ICMP_UNREACH;
1475: code = ICMP_UNREACH_NET_PROHIB;
1476: goto bad;
1477: }
1.114 itojun 1478: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1479: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1480: goto bad;
1481: }
1.1 cgd 1482: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1483: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1484: goto bad;
1485: }
1486: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1487: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1488: if (ia == 0) {
1489: if (opt == IPOPT_SSRR) {
1490: type = ICMP_UNREACH;
1491: code = ICMP_UNREACH_SRCFAIL;
1492: goto bad;
1493: }
1494: /*
1495: * Loose routing, and not at next destination
1496: * yet; nothing to do except forward.
1497: */
1498: break;
1499: }
1500: off--; /* 0 origin */
1.112 sommerfe 1501: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1502: /*
1503: * End of source route. Should be for us.
1504: */
1505: save_rte(cp, ip->ip_src);
1506: break;
1507: }
1508: /*
1509: * locate outgoing interface
1510: */
1511: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1512: sizeof(ipaddr.sin_addr));
1.96 thorpej 1513: if (opt == IPOPT_SSRR)
1.196 itojun 1514: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1515: else
1.1 cgd 1516: ia = ip_rtaddr(ipaddr.sin_addr);
1517: if (ia == 0) {
1518: type = ICMP_UNREACH;
1519: code = ICMP_UNREACH_SRCFAIL;
1520: goto bad;
1521: }
1522: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1523: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1524: (caddr_t)(cp + off), sizeof(struct in_addr));
1525: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1526: /*
1527: * Let ip_intr's mcast routing check handle mcast pkts
1528: */
1.18 mycroft 1529: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1530: break;
1531:
1532: case IPOPT_RR:
1.114 itojun 1533: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1534: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1535: goto bad;
1536: }
1.1 cgd 1537: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1538: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1539: goto bad;
1540: }
1541: /*
1542: * If no space remains, ignore.
1543: */
1544: off--; /* 0 origin */
1.112 sommerfe 1545: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1546: break;
1547: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1548: sizeof(ipaddr.sin_addr));
1549: /*
1550: * locate outgoing interface; if we're the destination,
1551: * use the incoming interface (should be same).
1552: */
1.96 thorpej 1553: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1554: == NULL &&
1555: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1556: type = ICMP_UNREACH;
1557: code = ICMP_UNREACH_HOST;
1558: goto bad;
1559: }
1.20 mycroft 1560: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1561: (caddr_t)(cp + off), sizeof(struct in_addr));
1562: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1563: break;
1564:
1565: case IPOPT_TS:
1566: code = cp - (u_char *)ip;
1567: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1568: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1569: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1570: goto bad;
1.114 itojun 1571: }
1572: if (ipt->ipt_ptr < 5) {
1573: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1574: goto bad;
1575: }
1.15 cgd 1576: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1577: if (++ipt->ipt_oflw == 0) {
1578: code = (u_char *)&ipt->ipt_ptr -
1579: (u_char *)ip;
1.1 cgd 1580: goto bad;
1.114 itojun 1581: }
1.1 cgd 1582: break;
1583: }
1.104 thorpej 1584: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1585: switch (ipt->ipt_flg) {
1586:
1587: case IPOPT_TS_TSONLY:
1588: break;
1589:
1590: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1591: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1592: sizeof(struct in_addr) > ipt->ipt_len) {
1593: code = (u_char *)&ipt->ipt_ptr -
1594: (u_char *)ip;
1.1 cgd 1595: goto bad;
1.114 itojun 1596: }
1.13 mycroft 1597: ipaddr.sin_addr = dst;
1.96 thorpej 1598: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1599: m->m_pkthdr.rcvif));
1.13 mycroft 1600: if (ia == 0)
1601: continue;
1.104 thorpej 1602: bcopy(&ia->ia_addr.sin_addr,
1603: cp0, sizeof(struct in_addr));
1.1 cgd 1604: ipt->ipt_ptr += sizeof(struct in_addr);
1605: break;
1606:
1607: case IPOPT_TS_PRESPEC:
1.66 thorpej 1608: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1609: sizeof(struct in_addr) > ipt->ipt_len) {
1610: code = (u_char *)&ipt->ipt_ptr -
1611: (u_char *)ip;
1.1 cgd 1612: goto bad;
1.114 itojun 1613: }
1.104 thorpej 1614: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1615: sizeof(struct in_addr));
1.96 thorpej 1616: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1617: == NULL)
1.1 cgd 1618: continue;
1619: ipt->ipt_ptr += sizeof(struct in_addr);
1620: break;
1621:
1622: default:
1.114 itojun 1623: /* XXX can't take &ipt->ipt_flg */
1624: code = (u_char *)&ipt->ipt_ptr -
1625: (u_char *)ip + 1;
1.1 cgd 1626: goto bad;
1627: }
1628: ntime = iptime();
1.107 thorpej 1629: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1630: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1631: sizeof(n_time));
1632: ipt->ipt_ptr += sizeof(n_time);
1633: }
1634: }
1635: if (forward) {
1.26 thorpej 1636: if (ip_forwsrcrt == 0) {
1637: type = ICMP_UNREACH;
1638: code = ICMP_UNREACH_SRCFAIL;
1639: goto bad;
1640: }
1.1 cgd 1641: ip_forward(m, 1);
1642: return (1);
1.13 mycroft 1643: }
1644: return (0);
1.1 cgd 1645: bad:
1.13 mycroft 1646: icmp_error(m, type, code, 0, 0);
1647: ipstat.ips_badoptions++;
1.1 cgd 1648: return (1);
1649: }
1650:
1651: /*
1652: * Given address of next destination (final or next hop),
1653: * return internet address info of interface to be used to get there.
1654: */
1655: struct in_ifaddr *
1.211 perry 1656: ip_rtaddr(struct in_addr dst)
1.1 cgd 1657: {
1.109 augustss 1658: struct sockaddr_in *sin;
1.1 cgd 1659:
1.19 mycroft 1660: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1661:
1.35 mycroft 1662: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1663: if (ipforward_rt.ro_rt) {
1664: RTFREE(ipforward_rt.ro_rt);
1665: ipforward_rt.ro_rt = 0;
1666: }
1667: sin->sin_family = AF_INET;
1668: sin->sin_len = sizeof(*sin);
1669: sin->sin_addr = dst;
1670:
1671: rtalloc(&ipforward_rt);
1672: }
1673: if (ipforward_rt.ro_rt == 0)
1674: return ((struct in_ifaddr *)0);
1.19 mycroft 1675: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1676: }
1677:
1678: /*
1679: * Save incoming source route for use in replies,
1680: * to be picked up later by ip_srcroute if the receiver is interested.
1681: */
1.13 mycroft 1682: void
1.211 perry 1683: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1684: {
1685: unsigned olen;
1686:
1687: olen = option[IPOPT_OLEN];
1688: #ifdef DIAGNOSTIC
1689: if (ipprintfs)
1.39 christos 1690: printf("save_rte: olen %d\n", olen);
1.89 itojun 1691: #endif /* 0 */
1.1 cgd 1692: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1693: return;
1694: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1695: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1696: ip_srcrt.dst = dst;
1697: }
1698:
1699: /*
1700: * Retrieve incoming source route for use in replies,
1701: * in the same form used by setsockopt.
1702: * The first hop is placed before the options, will be removed later.
1703: */
1704: struct mbuf *
1.211 perry 1705: ip_srcroute(void)
1.1 cgd 1706: {
1.109 augustss 1707: struct in_addr *p, *q;
1708: struct mbuf *m;
1.1 cgd 1709:
1710: if (ip_nhops == 0)
1711: return ((struct mbuf *)0);
1712: m = m_get(M_DONTWAIT, MT_SOOPTS);
1713: if (m == 0)
1714: return ((struct mbuf *)0);
1715:
1.164 matt 1716: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1717: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1718:
1719: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1720: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1721: OPTSIZ;
1722: #ifdef DIAGNOSTIC
1723: if (ipprintfs)
1.39 christos 1724: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1725: #endif
1726:
1727: /*
1728: * First save first hop for return route
1729: */
1730: p = &ip_srcrt.route[ip_nhops - 1];
1731: *(mtod(m, struct in_addr *)) = *p--;
1732: #ifdef DIAGNOSTIC
1733: if (ipprintfs)
1.39 christos 1734: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1735: #endif
1736:
1737: /*
1738: * Copy option fields and padding (nop) to mbuf.
1739: */
1740: ip_srcrt.nop = IPOPT_NOP;
1741: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1742: bcopy((caddr_t)&ip_srcrt.nop,
1743: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1744: q = (struct in_addr *)(mtod(m, caddr_t) +
1745: sizeof(struct in_addr) + OPTSIZ);
1746: #undef OPTSIZ
1747: /*
1748: * Record return path as an IP source route,
1749: * reversing the path (pointers are now aligned).
1750: */
1751: while (p >= ip_srcrt.route) {
1752: #ifdef DIAGNOSTIC
1753: if (ipprintfs)
1.39 christos 1754: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1755: #endif
1756: *q++ = *p--;
1757: }
1758: /*
1759: * Last hop goes to final destination.
1760: */
1761: *q = ip_srcrt.dst;
1762: #ifdef DIAGNOSTIC
1763: if (ipprintfs)
1.39 christos 1764: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1765: #endif
1766: return (m);
1767: }
1768:
1769: /*
1770: * Strip out IP options, at higher
1771: * level protocol in the kernel.
1772: * Second argument is buffer to which options
1773: * will be moved, and return value is their length.
1774: * XXX should be deleted; last arg currently ignored.
1775: */
1.8 mycroft 1776: void
1.211 perry 1777: ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
1.1 cgd 1778: {
1.109 augustss 1779: int i;
1.1 cgd 1780: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1781: caddr_t opts;
1.1 cgd 1782: int olen;
1783:
1.79 mycroft 1784: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1785: opts = (caddr_t)(ip + 1);
1786: i = m->m_len - (sizeof (struct ip) + olen);
1787: bcopy(opts + olen, opts, (unsigned)i);
1788: m->m_len -= olen;
1789: if (m->m_flags & M_PKTHDR)
1790: m->m_pkthdr.len -= olen;
1.155 itojun 1791: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79 mycroft 1792: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1793: }
1794:
1.139 matt 1795: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1796: 0, 0, 0, 0,
1797: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1798: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1799: EMSGSIZE, EHOSTUNREACH, 0, 0,
1800: 0, 0, 0, 0,
1801: ENOPROTOOPT
1802: };
1803:
1804: /*
1805: * Forward a packet. If some error occurs return the sender
1806: * an icmp packet. Note we can't always generate a meaningful
1807: * icmp message because icmp doesn't have a large enough repertoire
1808: * of codes and types.
1809: *
1810: * If not forwarding, just drop the packet. This could be confusing
1811: * if ipforwarding was zero but some routing protocol was advancing
1812: * us as a gateway to somewhere. However, we must let the routing
1813: * protocol deal with that.
1814: *
1815: * The srcrt parameter indicates whether the packet is being forwarded
1816: * via a source route.
1817: */
1.13 mycroft 1818: void
1.211 perry 1819: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1820: {
1.109 augustss 1821: struct ip *ip = mtod(m, struct ip *);
1822: struct sockaddr_in *sin;
1823: struct rtentry *rt;
1.28 christos 1824: int error, type = 0, code = 0;
1.1 cgd 1825: struct mbuf *mcopy;
1.13 mycroft 1826: n_long dest;
1827: struct ifnet *destifp;
1.173 jonathan 1828: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89 itojun 1829: struct ifnet dummyifp;
1830: #endif
1.164 matt 1831:
1832: /*
1833: * We are now in the output path.
1834: */
1835: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1836:
1837: /*
1838: * Clear any in-bound checksum flags for this packet.
1839: */
1840: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1841:
1.13 mycroft 1842: dest = 0;
1.1 cgd 1843: #ifdef DIAGNOSTIC
1844: if (ipprintfs)
1.70 thorpej 1845: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1846: ntohl(ip->ip_src.s_addr),
1847: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1848: #endif
1.93 sommerfe 1849: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1850: ipstat.ips_cantforward++;
1851: m_freem(m);
1852: return;
1853: }
1854: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1855: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1856: return;
1857: }
1858: ip->ip_ttl -= IPTTLDEC;
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) {
1.13 mycroft 1873: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 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:
1888: /*
1889: * If forwarding packet using same interface that it came in on,
1890: * perhaps should send a redirect to sender to shortcut a hop.
1891: * Only send redirect if source is sending directly to us,
1892: * and if packet was not source routed (or has any options).
1893: * Also, don't send redirect if forwarding using a default route
1894: * or a route modified by a redirect.
1895: */
1896: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1897: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1898: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1899: ipsendredirects && !srcrt) {
1.19 mycroft 1900: if (rt->rt_ifa &&
1901: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1902: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1903: if (rt->rt_flags & RTF_GATEWAY)
1904: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1905: else
1906: dest = ip->ip_dst.s_addr;
1907: /*
1908: * Router requirements says to only send host
1909: * redirects.
1910: */
1911: type = ICMP_REDIRECT;
1912: code = ICMP_REDIRECT_HOST;
1.1 cgd 1913: #ifdef DIAGNOSTIC
1.77 thorpej 1914: if (ipprintfs)
1915: printf("redirect (%d) to %x\n", code,
1916: (u_int32_t)dest);
1.1 cgd 1917: #endif
1918: }
1919: }
1920:
1.27 thorpej 1921: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173 jonathan 1922: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1923: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1924:
1.1 cgd 1925: if (error)
1926: ipstat.ips_cantforward++;
1927: else {
1928: ipstat.ips_forward++;
1929: if (type)
1930: ipstat.ips_redirectsent++;
1931: else {
1.63 matt 1932: if (mcopy) {
1933: #ifdef GATEWAY
1.64 thorpej 1934: if (mcopy->m_flags & M_CANFASTFWD)
1935: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1936: #endif
1.1 cgd 1937: m_freem(mcopy);
1.63 matt 1938: }
1.1 cgd 1939: return;
1940: }
1941: }
1942: if (mcopy == NULL)
1943: return;
1.13 mycroft 1944: destifp = NULL;
1945:
1.1 cgd 1946: switch (error) {
1947:
1948: case 0: /* forwarded, but need redirect */
1949: /* type, code set above */
1950: break;
1951:
1952: case ENETUNREACH: /* shouldn't happen, checked above */
1953: case EHOSTUNREACH:
1954: case ENETDOWN:
1955: case EHOSTDOWN:
1956: default:
1957: type = ICMP_UNREACH;
1958: code = ICMP_UNREACH_HOST;
1959: break;
1960:
1961: case EMSGSIZE:
1962: type = ICMP_UNREACH;
1963: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1964: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13 mycroft 1965: if (ipforward_rt.ro_rt)
1966: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1967: #else
1968: /*
1969: * If the packet is routed over IPsec tunnel, tell the
1970: * originator the tunnel MTU.
1971: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1972: * XXX quickhack!!!
1973: */
1974: if (ipforward_rt.ro_rt) {
1975: struct secpolicy *sp;
1976: int ipsecerror;
1.95 itojun 1977: size_t ipsechdr;
1.89 itojun 1978: struct route *ro;
1979:
1980: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1981: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1982: &ipsecerror);
1.89 itojun 1983:
1984: if (sp == NULL)
1985: destifp = ipforward_rt.ro_rt->rt_ifp;
1986: else {
1987: /* count IPsec header size */
1.95 itojun 1988: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1989: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1990:
1991: /*
1992: * find the correct route for outer IPv4
1993: * header, compute tunnel MTU.
1994: *
1995: * XXX BUG ALERT
1996: * The "dummyifp" code relies upon the fact
1997: * that icmp_error() touches only ifp->if_mtu.
1998: */
1999: /*XXX*/
2000: destifp = NULL;
2001: if (sp->req != NULL
1.95 itojun 2002: && sp->req->sav != NULL
2003: && sp->req->sav->sah != NULL) {
2004: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 2005: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
2006: dummyifp.if_mtu =
1.151 itojun 2007: ro->ro_rt->rt_rmx.rmx_mtu ?
2008: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 2009: ro->ro_rt->rt_ifp->if_mtu;
2010: dummyifp.if_mtu -= ipsechdr;
2011: destifp = &dummyifp;
2012: }
2013: }
2014:
1.173 jonathan 2015: #ifdef IPSEC
1.89 itojun 2016: key_freesp(sp);
1.173 jonathan 2017: #else
2018: KEY_FREESP(&sp);
2019: #endif
1.89 itojun 2020: }
2021: }
2022: #endif /*IPSEC*/
1.1 cgd 2023: ipstat.ips_cantfrag++;
2024: break;
2025:
2026: case ENOBUFS:
1.143 itojun 2027: #if 1
2028: /*
2029: * a router should not generate ICMP_SOURCEQUENCH as
2030: * required in RFC1812 Requirements for IP Version 4 Routers.
2031: * source quench could be a big problem under DoS attacks,
1.149 wiz 2032: * or if the underlying interface is rate-limited.
1.143 itojun 2033: */
2034: if (mcopy)
2035: m_freem(mcopy);
2036: return;
2037: #else
1.1 cgd 2038: type = ICMP_SOURCEQUENCH;
2039: code = 0;
2040: break;
1.143 itojun 2041: #endif
1.1 cgd 2042: }
1.13 mycroft 2043: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 2044: }
2045:
2046: void
1.211 perry 2047: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2048: struct mbuf *m)
1.44 thorpej 2049: {
2050:
2051: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2052: struct timeval tv;
2053:
2054: microtime(&tv);
2055: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
2056: SCM_TIMESTAMP, SOL_SOCKET);
2057: if (*mp)
2058: mp = &(*mp)->m_next;
2059: }
2060: if (inp->inp_flags & INP_RECVDSTADDR) {
2061: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2062: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2063: if (*mp)
2064: mp = &(*mp)->m_next;
2065: }
2066: #ifdef notyet
2067: /*
2068: * XXX
2069: * Moving these out of udp_input() made them even more broken
2070: * than they already were.
2071: * - fenner@parc.xerox.com
2072: */
2073: /* options were tossed already */
2074: if (inp->inp_flags & INP_RECVOPTS) {
2075: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2076: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2077: if (*mp)
2078: mp = &(*mp)->m_next;
2079: }
2080: /* ip_srcroute doesn't do what we want here, need to fix */
2081: if (inp->inp_flags & INP_RECVRETOPTS) {
2082: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2083: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2084: if (*mp)
2085: mp = &(*mp)->m_next;
2086: }
2087: #endif
2088: if (inp->inp_flags & INP_RECVIF) {
2089: struct sockaddr_dl sdl;
2090:
2091: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
2092: sdl.sdl_family = AF_LINK;
2093: sdl.sdl_index = m->m_pkthdr.rcvif ?
2094: m->m_pkthdr.rcvif->if_index : 0;
2095: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
2096: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
2097: IP_RECVIF, IPPROTO_IP);
2098: if (*mp)
2099: mp = &(*mp)->m_next;
2100: }
1.13 mycroft 2101: }
2102:
1.189 atatat 2103: /*
2104: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2105: * range of the new value and tweaks timers if it changes.
2106: */
2107: static int
2108: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2109: {
1.189 atatat 2110: int error, tmp;
2111: struct sysctlnode node;
2112:
2113: node = *rnode;
2114: tmp = ip_mtudisc_timeout;
2115: node.sysctl_data = &tmp;
2116: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2117: if (error || newp == NULL)
2118: return (error);
2119: if (tmp < 0)
2120: return (EINVAL);
1.52 thorpej 2121:
1.189 atatat 2122: ip_mtudisc_timeout = tmp;
2123: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2124:
2125: return (0);
2126: }
1.54 lukem 2127:
1.65 matt 2128: #ifdef GATEWAY
1.189 atatat 2129: /*
2130: * sysctl helper routine for net.inet.ip.maxflows. apparently if
2131: * maxflows is even looked up, we "reap flows".
2132: */
2133: static int
2134: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2135: {
2136: int s;
1.67 thorpej 2137:
1.189 atatat 2138: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
2139: if (s)
2140: return (s);
1.212 perry 2141:
1.189 atatat 2142: s = splsoftnet();
2143: ipflow_reap(0);
2144: splx(s);
1.144 martin 2145:
1.189 atatat 2146: return (0);
2147: }
2148: #endif /* GATEWAY */
1.117 tron 2149:
1.131 itojun 2150:
1.189 atatat 2151: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2152: {
2153: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2154:
1.197 atatat 2155: sysctl_createv(clog, 0, NULL, NULL,
2156: CTLFLAG_PERMANENT,
1.189 atatat 2157: CTLTYPE_NODE, "net", NULL,
2158: NULL, 0, NULL, 0,
2159: CTL_NET, CTL_EOL);
1.197 atatat 2160: sysctl_createv(clog, 0, NULL, NULL,
2161: CTLFLAG_PERMANENT,
1.203 atatat 2162: CTLTYPE_NODE, "inet",
2163: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2164: NULL, 0, NULL, 0,
2165: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2166: sysctl_createv(clog, 0, NULL, NULL,
2167: CTLFLAG_PERMANENT,
1.203 atatat 2168: CTLTYPE_NODE, "ip",
2169: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2170: NULL, 0, NULL, 0,
2171: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2172:
1.197 atatat 2173: sysctl_createv(clog, 0, NULL, NULL,
2174: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2175: CTLTYPE_INT, "forwarding",
2176: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2177: NULL, 0, &ipforwarding, 0,
2178: CTL_NET, PF_INET, IPPROTO_IP,
2179: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2180: sysctl_createv(clog, 0, NULL, NULL,
2181: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2182: CTLTYPE_INT, "redirect",
2183: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2184: NULL, 0, &ipsendredirects, 0,
2185: CTL_NET, PF_INET, IPPROTO_IP,
2186: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2187: sysctl_createv(clog, 0, NULL, NULL,
2188: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2189: CTLTYPE_INT, "ttl",
2190: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2191: NULL, 0, &ip_defttl, 0,
2192: CTL_NET, PF_INET, IPPROTO_IP,
2193: IPCTL_DEFTTL, CTL_EOL);
2194: #ifdef IPCTL_DEFMTU
1.197 atatat 2195: sysctl_createv(clog, 0, NULL, NULL,
2196: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2197: CTLTYPE_INT, "mtu",
2198: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2199: NULL, 0, &ip_mtu, 0,
2200: CTL_NET, PF_INET, IPPROTO_IP,
2201: IPCTL_DEFMTU, CTL_EOL);
2202: #endif /* IPCTL_DEFMTU */
1.197 atatat 2203: sysctl_createv(clog, 0, NULL, NULL,
2204: CTLFLAG_PERMANENT|CTLFLAG_READONLY1,
1.203 atatat 2205: CTLTYPE_INT, "forwsrcrt",
2206: SYSCTL_DESCR("Enable forwarding of source-routed "
2207: "datagrams"),
1.189 atatat 2208: NULL, 0, &ip_forwsrcrt, 0,
2209: CTL_NET, PF_INET, IPPROTO_IP,
2210: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2211: sysctl_createv(clog, 0, NULL, NULL,
2212: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2213: CTLTYPE_INT, "directed-broadcast",
2214: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2215: NULL, 0, &ip_directedbcast, 0,
2216: CTL_NET, PF_INET, IPPROTO_IP,
2217: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2218: sysctl_createv(clog, 0, NULL, NULL,
2219: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2220: CTLTYPE_INT, "allowsrcrt",
2221: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2222: NULL, 0, &ip_allowsrcrt, 0,
2223: CTL_NET, PF_INET, IPPROTO_IP,
2224: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2225: sysctl_createv(clog, 0, NULL, NULL,
2226: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2227: CTLTYPE_INT, "subnetsarelocal",
2228: SYSCTL_DESCR("Whether logical subnets are considered "
2229: "local"),
1.189 atatat 2230: NULL, 0, &subnetsarelocal, 0,
2231: CTL_NET, PF_INET, IPPROTO_IP,
2232: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2233: sysctl_createv(clog, 0, NULL, NULL,
2234: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2235: CTLTYPE_INT, "mtudisc",
2236: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2237: NULL, 0, &ip_mtudisc, 0,
2238: CTL_NET, PF_INET, IPPROTO_IP,
2239: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2240: sysctl_createv(clog, 0, NULL, NULL,
2241: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2242: CTLTYPE_INT, "anonportmin",
2243: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2244: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2245: CTL_NET, PF_INET, IPPROTO_IP,
2246: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2247: sysctl_createv(clog, 0, NULL, NULL,
2248: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2249: CTLTYPE_INT, "anonportmax",
2250: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2251: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2252: CTL_NET, PF_INET, IPPROTO_IP,
2253: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2254: sysctl_createv(clog, 0, NULL, NULL,
2255: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2256: CTLTYPE_INT, "mtudisctimeout",
2257: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2258: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2259: CTL_NET, PF_INET, IPPROTO_IP,
2260: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2261: #ifdef GATEWAY
1.197 atatat 2262: sysctl_createv(clog, 0, NULL, NULL,
2263: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2264: CTLTYPE_INT, "maxflows",
2265: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2266: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2267: CTL_NET, PF_INET, IPPROTO_IP,
2268: IPCTL_MAXFLOWS, CTL_EOL);
2269: #endif /* GATEWAY */
1.197 atatat 2270: sysctl_createv(clog, 0, NULL, NULL,
2271: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2272: CTLTYPE_INT, "hostzerobroadcast",
2273: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2274: NULL, 0, &hostzeroisbroadcast, 0,
2275: CTL_NET, PF_INET, IPPROTO_IP,
2276: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2277: #if NGIF > 0
1.197 atatat 2278: sysctl_createv(clog, 0, NULL, NULL,
2279: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2280: CTLTYPE_INT, "gifttl",
2281: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2282: NULL, 0, &ip_gif_ttl, 0,
2283: CTL_NET, PF_INET, IPPROTO_IP,
2284: IPCTL_GIF_TTL, CTL_EOL);
2285: #endif /* NGIF */
2286: #ifndef IPNOPRIVPORTS
1.197 atatat 2287: sysctl_createv(clog, 0, NULL, NULL,
2288: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2289: CTLTYPE_INT, "lowportmin",
2290: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2291: "to assign"),
1.189 atatat 2292: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2293: CTL_NET, PF_INET, IPPROTO_IP,
2294: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2295: sysctl_createv(clog, 0, NULL, NULL,
2296: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2297: CTLTYPE_INT, "lowportmax",
2298: SYSCTL_DESCR("Highest privileged ephemeral port number "
2299: "to assign"),
1.189 atatat 2300: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2301: CTL_NET, PF_INET, IPPROTO_IP,
2302: IPCTL_LOWPORTMAX, CTL_EOL);
2303: #endif /* IPNOPRIVPORTS */
1.197 atatat 2304: sysctl_createv(clog, 0, NULL, NULL,
2305: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2306: CTLTYPE_INT, "maxfragpackets",
2307: SYSCTL_DESCR("Maximum number of fragments to retain for "
2308: "possible reassembly"),
1.189 atatat 2309: NULL, 0, &ip_maxfragpackets, 0,
2310: CTL_NET, PF_INET, IPPROTO_IP,
2311: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2312: #if NGRE > 0
1.197 atatat 2313: sysctl_createv(clog, 0, NULL, NULL,
2314: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2315: CTLTYPE_INT, "grettl",
2316: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2317: NULL, 0, &ip_gre_ttl, 0,
2318: CTL_NET, PF_INET, IPPROTO_IP,
2319: IPCTL_GRE_TTL, CTL_EOL);
2320: #endif /* NGRE */
1.197 atatat 2321: sysctl_createv(clog, 0, NULL, NULL,
2322: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2323: CTLTYPE_INT, "checkinterface",
2324: SYSCTL_DESCR("Enable receive side of Strong ES model "
2325: "from RFC1122"),
1.189 atatat 2326: NULL, 0, &ip_checkinterface, 0,
2327: CTL_NET, PF_INET, IPPROTO_IP,
2328: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2329: sysctl_createv(clog, 0, NULL, NULL,
2330: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2331: CTLTYPE_INT, "random_id",
2332: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2333: NULL, 0, &ip_do_randomid, 0,
2334: CTL_NET, PF_INET, IPPROTO_IP,
2335: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2336: sysctl_createv(clog, 0, NULL, NULL,
2337: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2338: CTLTYPE_INT, "do_loopback_cksum",
2339: SYSCTL_DESCR("Perform IP checksum on loopback"),
2340: NULL, 0, &ip_do_loopback_cksum, 0,
2341: CTL_NET, PF_INET, IPPROTO_IP,
2342: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.1 cgd 2343: }
CVSweb <webmaster@jp.NetBSD.org>