Annotation of src/sys/netinet/ip_input.c, Revision 1.190
1.190 ! jonathan 1: /* $NetBSD: ip_input.c,v 1.189 2003/12/04 19:38:24 atatat 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>
1.190 ! jonathan 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.189 2003/12/04 19:38:24 atatat 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>
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: extern struct domain inetdomain;
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 */
1.181 jonathan 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:
1.190 ! jonathan 239: /* IP datagram reassembly queues (hashed) */
! 240: #define IPREASS_NHASH_LOG2 6
! 241: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
! 242: #define IPREASS_HMASK (IPREASS_NHASH - 1)
! 243: #define IPREASS_HASH(x,y) \
! 244: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
! 245: struct ipqhead ipq[IPREASS_NHASH];
! 246: #ifdef notyet
! 247: static int nipq = 0; /* total # of reass queues */
! 248: #endif
1.75 thorpej 249: int ipq_locked;
1.131 itojun 250: int ip_nfragpackets = 0;
1.133 itojun 251: int ip_maxfragpackets = 200;
1.75 thorpej 252:
253: static __inline int ipq_lock_try __P((void));
254: static __inline void ipq_unlock __P((void));
255:
256: static __inline int
257: ipq_lock_try()
258: {
259: int s;
260:
1.132 thorpej 261: /*
1.149 wiz 262: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 263: * mbuf allocation.
264: */
265: s = splvm();
1.75 thorpej 266: if (ipq_locked) {
267: splx(s);
268: return (0);
269: }
270: ipq_locked = 1;
271: splx(s);
272: return (1);
273: }
274:
275: static __inline void
276: ipq_unlock()
277: {
278: int s;
279:
1.132 thorpej 280: s = splvm();
1.75 thorpej 281: ipq_locked = 0;
282: splx(s);
283: }
284:
285: #ifdef DIAGNOSTIC
286: #define IPQ_LOCK() \
287: do { \
288: if (ipq_lock_try() == 0) { \
289: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
290: panic("ipq_lock"); \
291: } \
1.159 perry 292: } while (/*CONSTCOND*/ 0)
1.75 thorpej 293: #define IPQ_LOCK_CHECK() \
294: do { \
295: if (ipq_locked == 0) { \
296: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
297: panic("ipq lock check"); \
298: } \
1.159 perry 299: } while (/*CONSTCOND*/ 0)
1.75 thorpej 300: #else
301: #define IPQ_LOCK() (void) ipq_lock_try()
302: #define IPQ_LOCK_CHECK() /* nothing */
303: #endif
304:
305: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 306:
1.166 matt 307: struct pool inmulti_pool;
1.72 thorpej 308: struct pool ipqent_pool;
309:
1.135 thorpej 310: #ifdef INET_CSUM_COUNTERS
311: #include <sys/device.h>
312:
313: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
314: NULL, "inet", "hwcsum bad");
315: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
316: NULL, "inet", "hwcsum ok");
317: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
318: NULL, "inet", "swcsum");
319:
320: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
321:
322: #else
323:
324: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
325:
326: #endif /* INET_CSUM_COUNTERS */
327:
1.1 cgd 328: /*
329: * We need to save the IP options in case a protocol wants to respond
330: * to an incoming packet over the same route if the packet got here
331: * using IP source routing. This allows connection establishment and
332: * maintenance when the remote end is on a network that is not known
333: * to us.
334: */
335: int ip_nhops = 0;
336: static struct ip_srcrt {
337: struct in_addr dst; /* final destination */
338: char nop; /* one NOP to align */
339: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
340: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
341: } ip_srcrt;
342:
1.13 mycroft 343: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 344:
1.164 matt 345: #ifdef MBUFTRACE
346: struct mowner ip_rx_mowner = { "internet", "rx" };
347: struct mowner ip_tx_mowner = { "internet", "tx" };
348: #endif
349:
1.1 cgd 350: /*
351: * IP initialization: fill in IP protocol switch table.
352: * All protocols not implemented in kernel go to raw IP protocol handler.
353: */
1.8 mycroft 354: void
1.1 cgd 355: ip_init()
356: {
1.109 augustss 357: struct protosw *pr;
358: int i;
1.1 cgd 359:
1.166 matt 360: pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
361: NULL);
1.72 thorpej 362: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
1.146 thorpej 363: NULL);
1.72 thorpej 364:
1.1 cgd 365: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
366: if (pr == 0)
367: panic("ip_init");
368: for (i = 0; i < IPPROTO_MAX; i++)
369: ip_protox[i] = pr - inetsw;
370: for (pr = inetdomain.dom_protosw;
371: pr < inetdomain.dom_protoswNPROTOSW; pr++)
372: if (pr->pr_domain->dom_family == PF_INET &&
373: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
374: ip_protox[pr->pr_protocol] = pr - inetsw;
1.190 ! jonathan 375: for (i = 0; i < IPREASS_NHASH; i++)
! 376: LIST_INIT(&ipq[i]);
! 377:
1.183 jonathan 378: ip_id = time.tv_sec & 0xfffff;
1.1 cgd 379: ipintrq.ifq_maxlen = ipqmaxlen;
1.181 jonathan 380: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 381: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
382: M_WAITOK, &in_ifaddrhash);
1.166 matt 383: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
384: M_WAITOK, &in_multihash);
1.160 itojun 385: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 386: #ifdef GATEWAY
387: ipflow_init();
388: #endif
1.121 thorpej 389:
390: #ifdef PFIL_HOOKS
391: /* Register our Packet Filter hook. */
1.126 thorpej 392: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
393: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 394: i = pfil_head_register(&inet_pfil_hook);
395: if (i != 0)
396: printf("ip_init: WARNING: unable to register pfil hook, "
397: "error %d\n", i);
398: #endif /* PFIL_HOOKS */
1.135 thorpej 399:
400: #ifdef INET_CSUM_COUNTERS
401: evcnt_attach_static(&ip_hwcsum_bad);
402: evcnt_attach_static(&ip_hwcsum_ok);
403: evcnt_attach_static(&ip_swcsum);
404: #endif /* INET_CSUM_COUNTERS */
1.164 matt 405:
406: #ifdef MBUFTRACE
407: MOWNER_ATTACH(&ip_tx_mowner);
408: MOWNER_ATTACH(&ip_rx_mowner);
409: #endif /* MBUFTRACE */
1.1 cgd 410: }
411:
412: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
413: struct route ipforward_rt;
414:
415: /*
1.89 itojun 416: * IP software interrupt routine
417: */
418: void
419: ipintr()
420: {
421: int s;
422: struct mbuf *m;
423:
424: while (1) {
1.132 thorpej 425: s = splnet();
1.89 itojun 426: IF_DEQUEUE(&ipintrq, m);
427: splx(s);
428: if (m == 0)
429: return;
1.164 matt 430: MCLAIM(m, &ip_rx_mowner);
1.89 itojun 431: ip_input(m);
432: }
433: }
434:
435: /*
1.1 cgd 436: * Ip input routine. Checksum and byte swap header. If fragmented
437: * try to reassemble. Process options. Pass to next level.
438: */
1.8 mycroft 439: void
1.89 itojun 440: ip_input(struct mbuf *m)
1.1 cgd 441: {
1.109 augustss 442: struct ip *ip = NULL;
443: struct ipq *fp;
444: struct in_ifaddr *ia;
445: struct ifaddr *ifa;
1.25 cgd 446: struct ipqent *ipqe;
1.89 itojun 447: int hlen = 0, mff, len;
1.100 itojun 448: int downmatch;
1.165 christos 449: int checkif;
1.169 itojun 450: int srcrt = 0;
1.190 ! jonathan 451: u_int hash;
1.173 jonathan 452: #ifdef FAST_IPSEC
453: struct m_tag *mtag;
454: struct tdb_ident *tdbi;
455: struct secpolicy *sp;
456: int s, error;
457: #endif /* FAST_IPSEC */
1.1 cgd 458:
1.164 matt 459: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 460: #ifdef DIAGNOSTIC
461: if ((m->m_flags & M_PKTHDR) == 0)
462: panic("ipintr no HDR");
1.89 itojun 463: #endif
1.164 matt 464:
1.1 cgd 465: /*
466: * If no IP addresses have been set yet but the interfaces
467: * are receiving, can't do anything with incoming packets yet.
468: */
1.181 jonathan 469: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 470: goto bad;
471: ipstat.ips_total++;
1.154 thorpej 472: /*
473: * If the IP header is not aligned, slurp it up into a new
474: * mbuf with space for link headers, in the event we forward
475: * it. Otherwise, if it is aligned, make sure the entire
476: * base IP header is in the first mbuf of the chain.
477: */
478: if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
479: if ((m = m_copyup(m, sizeof(struct ip),
480: (max_linkhdr + 3) & ~3)) == NULL) {
481: /* XXXJRT new stat, please */
482: ipstat.ips_toosmall++;
483: return;
484: }
485: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
486: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
487: ipstat.ips_toosmall++;
488: return;
489: }
1.1 cgd 490: }
491: ip = mtod(m, struct ip *);
1.13 mycroft 492: if (ip->ip_v != IPVERSION) {
493: ipstat.ips_badvers++;
494: goto bad;
495: }
1.1 cgd 496: hlen = ip->ip_hl << 2;
497: if (hlen < sizeof(struct ip)) { /* minimum header length */
498: ipstat.ips_badhlen++;
499: goto bad;
500: }
501: if (hlen > m->m_len) {
502: if ((m = m_pullup(m, hlen)) == 0) {
503: ipstat.ips_badhlen++;
1.89 itojun 504: return;
1.1 cgd 505: }
506: ip = mtod(m, struct ip *);
507: }
1.98 thorpej 508:
1.85 hwr 509: /*
1.99 thorpej 510: * RFC1122: packets with a multicast source address are
1.98 thorpej 511: * not allowed.
1.85 hwr 512: */
513: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 514: ipstat.ips_badaddr++;
1.85 hwr 515: goto bad;
1.129 itojun 516: }
517:
518: /* 127/8 must not appear on wire - RFC1122 */
519: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
520: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 521: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
522: ipstat.ips_badaddr++;
1.129 itojun 523: goto bad;
1.130 itojun 524: }
1.85 hwr 525: }
526:
1.135 thorpej 527: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 528: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 529: M_CSUM_IPv4_BAD)) {
530: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
531: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
532: goto badcsum;
533:
534: case M_CSUM_IPv4:
535: /* Checksum was okay. */
536: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
537: break;
538:
539: default:
540: /* Must compute it ourselves. */
541: INET_CSUM_COUNTER_INCR(&ip_swcsum);
542: if (in_cksum(m, hlen) != 0)
543: goto bad;
544: break;
1.1 cgd 545: }
546:
1.121 thorpej 547: /* Retrieve the packet length. */
548: len = ntohs(ip->ip_len);
1.81 proff 549:
550: /*
551: * Check for additional length bogosity
552: */
1.84 proff 553: if (len < hlen) {
1.81 proff 554: ipstat.ips_badlen++;
555: goto bad;
556: }
1.1 cgd 557:
558: /*
559: * Check that the amount of data in the buffers
560: * is as at least much as the IP header would have us expect.
561: * Trim mbufs if longer than we expect.
562: * Drop packet if shorter than we expect.
563: */
1.35 mycroft 564: if (m->m_pkthdr.len < len) {
1.1 cgd 565: ipstat.ips_tooshort++;
566: goto bad;
567: }
1.35 mycroft 568: if (m->m_pkthdr.len > len) {
1.1 cgd 569: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 570: m->m_len = len;
571: m->m_pkthdr.len = len;
1.1 cgd 572: } else
1.35 mycroft 573: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 574: }
575:
1.188 scw 576: #if defined(IPSEC) || defined(FAST_IPSEC)
1.149 wiz 577: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 578: m->m_flags &= ~M_CANFASTFWD;
579: #else
1.64 thorpej 580: /*
581: * Assume that we can create a fast-forward IP flow entry
582: * based on this packet.
583: */
584: m->m_flags |= M_CANFASTFWD;
1.94 itojun 585: #endif
1.64 thorpej 586:
1.36 mrg 587: #ifdef PFIL_HOOKS
1.33 mrg 588: /*
1.64 thorpej 589: * Run through list of hooks for input packets. If there are any
590: * filters which require that additional packets in the flow are
591: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
592: * Note that filters must _never_ set this flag, as another filter
593: * in the list may have previously cleared it.
1.33 mrg 594: */
1.127 itojun 595: /*
596: * let ipfilter look at packet on the wire,
597: * not the decapsulated packet.
598: */
599: #ifdef IPSEC
1.136 itojun 600: if (!ipsec_getnhist(m))
1.186 scw 601: #elif defined(FAST_IPSEC)
602: if (!ipsec_indone(m))
1.127 itojun 603: #else
604: if (1)
605: #endif
606: {
1.169 itojun 607: struct in_addr odst;
608:
609: odst = ip->ip_dst;
1.127 itojun 610: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 611: PFIL_IN) != 0)
612: return;
1.127 itojun 613: if (m == NULL)
614: return;
615: ip = mtod(m, struct ip *);
1.142 darrenr 616: hlen = ip->ip_hl << 2;
1.169 itojun 617: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 618: }
1.36 mrg 619: #endif /* PFIL_HOOKS */
1.123 thorpej 620:
621: #ifdef ALTQ
622: /* XXX Temporary until ALTQ is changed to use a pfil hook */
623: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
624: /* packet dropped by traffic conditioner */
625: return;
626: }
627: #endif
1.121 thorpej 628:
629: /*
1.1 cgd 630: * Process options and, if not destined for us,
631: * ship it on. ip_dooptions returns 1 when an
632: * error was detected (causing an icmp message
633: * to be sent and the original packet to be freed).
634: */
635: ip_nhops = 0; /* for source routed packets */
636: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 637: return;
1.1 cgd 638:
639: /*
1.165 christos 640: * Enable a consistency check between the destination address
641: * and the arrival interface for a unicast packet (the RFC 1122
642: * strong ES model) if IP forwarding is disabled and the packet
643: * is not locally generated.
644: *
645: * XXX - Checking also should be disabled if the destination
646: * address is ipnat'ed to a different interface.
647: *
648: * XXX - Checking is incompatible with IP aliases added
649: * to the loopback interface instead of the interface where
650: * the packets are received.
651: *
652: * XXX - We need to add a per ifaddr flag for this so that
653: * we get finer grain control.
654: */
655: checkif = ip_checkinterface && (ipforwarding == 0) &&
656: (m->m_pkthdr.rcvif != NULL) &&
657: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
658:
659: /*
1.1 cgd 660: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 661: *
662: * Traditional 4.4BSD did not consult IFF_UP at all.
663: * The behavior here is to treat addresses on !IFF_UP interface
664: * as not mine.
1.1 cgd 665: */
1.100 itojun 666: downmatch = 0;
1.140 matt 667: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 668: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 669: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
670: continue;
1.97 itojun 671: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
672: break;
1.100 itojun 673: else
674: downmatch++;
1.97 itojun 675: }
676: }
1.86 thorpej 677: if (ia != NULL)
678: goto ours;
1.57 tls 679: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.140 matt 680: TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
681: if (ifa->ifa_addr->sa_family != AF_INET)
682: continue;
1.57 tls 683: ia = ifatoia(ifa);
1.35 mycroft 684: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
685: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 686: /*
687: * Look for all-0's host part (old broadcast addr),
688: * either for subnet or net.
689: */
690: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 691: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 692: goto ours;
1.57 tls 693: /*
694: * An interface with IP address zero accepts
695: * all packets that arrive on that interface.
696: */
697: if (in_nullhost(ia->ia_addr.sin_addr))
698: goto ours;
1.1 cgd 699: }
700: }
1.18 mycroft 701: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 702: struct in_multi *inm;
703: #ifdef MROUTING
704: extern struct socket *ip_mrouter;
1.10 brezak 705:
1.147 matt 706: if (M_READONLY(m)) {
1.10 brezak 707: if ((m = m_pullup(m, hlen)) == 0) {
708: ipstat.ips_toosmall++;
1.89 itojun 709: return;
1.10 brezak 710: }
711: ip = mtod(m, struct ip *);
712: }
1.4 hpeyerl 713:
714: if (ip_mrouter) {
715: /*
716: * If we are acting as a multicast router, all
717: * incoming multicast packets are passed to the
718: * kernel-level multicast forwarding function.
719: * The packet is returned (relatively) intact; if
720: * ip_mforward() returns a non-zero value, the packet
721: * must be discarded, else it may be accepted below.
722: *
723: * (The IP ident field is put in the same byte order
724: * as expected when ip_mforward() is called from
725: * ip_output().)
726: */
1.13 mycroft 727: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
728: ipstat.ips_cantforward++;
1.4 hpeyerl 729: m_freem(m);
1.89 itojun 730: return;
1.4 hpeyerl 731: }
732:
733: /*
734: * The process-level routing demon needs to receive
735: * all multicast IGMP packets, whether or not this
736: * host belongs to their destination groups.
737: */
738: if (ip->ip_p == IPPROTO_IGMP)
739: goto ours;
1.13 mycroft 740: ipstat.ips_forward++;
1.4 hpeyerl 741: }
742: #endif
743: /*
744: * See if we belong to the destination multicast group on the
745: * arrival interface.
746: */
747: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
748: if (inm == NULL) {
1.13 mycroft 749: ipstat.ips_cantforward++;
1.4 hpeyerl 750: m_freem(m);
1.89 itojun 751: return;
1.4 hpeyerl 752: }
753: goto ours;
754: }
1.19 mycroft 755: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 756: in_nullhost(ip->ip_dst))
1.1 cgd 757: goto ours;
758:
759: /*
760: * Not for us; forward if possible and desirable.
761: */
762: if (ipforwarding == 0) {
763: ipstat.ips_cantforward++;
764: m_freem(m);
1.100 itojun 765: } else {
766: /*
767: * If ip_dst matched any of my address on !IFF_UP interface,
768: * and there's no IFF_UP interface that matches ip_dst,
769: * send icmp unreach. Forwarding it will result in in-kernel
770: * forwarding loop till TTL goes to 0.
771: */
772: if (downmatch) {
773: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
774: ipstat.ips_cantforward++;
775: return;
776: }
1.145 itojun 777: #ifdef IPSEC
778: if (ipsec4_in_reject(m, NULL)) {
779: ipsecstat.in_polvio++;
780: goto bad;
781: }
782: #endif
1.173 jonathan 783: #ifdef FAST_IPSEC
784: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
785: s = splsoftnet();
786: if (mtag != NULL) {
787: tdbi = (struct tdb_ident *)(mtag + 1);
788: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
789: } else {
790: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
791: IP_FORWARDING, &error);
792: }
793: if (sp == NULL) { /* NB: can happen if error */
794: splx(s);
795: /*XXX error stat???*/
796: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
797: goto bad;
798: }
799:
800: /*
801: * Check security policy against packet attributes.
802: */
803: error = ipsec_in_reject(sp, m);
804: KEY_FREESP(&sp);
805: splx(s);
806: if (error) {
807: ipstat.ips_cantforward++;
808: goto bad;
809: }
810: #endif /* FAST_IPSEC */
1.145 itojun 811:
1.169 itojun 812: ip_forward(m, srcrt);
1.100 itojun 813: }
1.89 itojun 814: return;
1.1 cgd 815:
816: ours:
817: /*
818: * If offset or IP_MF are set, must reassemble.
819: * Otherwise, nothing need be done.
820: * (We could look in the reassembly queue to see
821: * if the packet was previously fragmented,
822: * but it's not worth the time; just let them time out.)
823: */
1.155 itojun 824: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
825: if (M_READONLY(m)) {
826: if ((m = m_pullup(m, hlen)) == NULL) {
827: ipstat.ips_toosmall++;
828: goto bad;
829: }
830: ip = mtod(m, struct ip *);
831: }
832:
1.1 cgd 833: /*
834: * Look for queue of fragments
835: * of this datagram.
836: */
1.75 thorpej 837: IPQ_LOCK();
1.190 ! jonathan 838: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
! 839: /* XXX LIST_FOREACH(fp, &ipq[hash], ipq_q) */
! 840: for (fp = LIST_FIRST(&ipq[hash]); fp != NULL;
! 841: fp = LIST_NEXT(fp, ipq_q)) {
1.1 cgd 842: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 843: in_hosteq(ip->ip_src, fp->ipq_src) &&
844: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 845: ip->ip_p == fp->ipq_p)
846: goto found;
1.190 ! jonathan 847:
! 848: }
1.1 cgd 849: fp = 0;
850: found:
851:
852: /*
853: * Adjust ip_len to not reflect header,
1.25 cgd 854: * set ipqe_mff if more fragments are expected,
1.1 cgd 855: * convert offset of this to bytes.
856: */
1.155 itojun 857: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
858: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 859: if (mff) {
1.16 cgd 860: /*
861: * Make sure that fragments have a data length
862: * that's a non-zero multiple of 8 bytes.
863: */
1.155 itojun 864: if (ntohs(ip->ip_len) == 0 ||
865: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 866: ipstat.ips_badfrags++;
1.75 thorpej 867: IPQ_UNLOCK();
1.16 cgd 868: goto bad;
869: }
870: }
1.155 itojun 871: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 872:
873: /*
874: * If datagram marked as having more fragments
875: * or if this is not the first fragment,
876: * attempt reassembly; if it succeeds, proceed.
877: */
1.155 itojun 878: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 879: ipstat.ips_fragments++;
1.72 thorpej 880: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 881: if (ipqe == NULL) {
882: ipstat.ips_rcvmemdrop++;
1.75 thorpej 883: IPQ_UNLOCK();
1.25 cgd 884: goto bad;
885: }
886: ipqe->ipqe_mff = mff;
1.50 thorpej 887: ipqe->ipqe_m = m;
1.25 cgd 888: ipqe->ipqe_ip = ip;
1.190 ! jonathan 889: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 890: if (m == 0) {
891: IPQ_UNLOCK();
1.89 itojun 892: return;
1.75 thorpej 893: }
1.13 mycroft 894: ipstat.ips_reassembled++;
1.50 thorpej 895: ip = mtod(m, struct ip *);
1.74 thorpej 896: hlen = ip->ip_hl << 2;
1.155 itojun 897: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 898: } else
899: if (fp)
900: ip_freef(fp);
1.75 thorpej 901: IPQ_UNLOCK();
1.79 mycroft 902: }
1.128 itojun 903:
1.173 jonathan 904: #if defined(IPSEC)
1.128 itojun 905: /*
906: * enforce IPsec policy checking if we are seeing last header.
907: * note that we do not visit this with protocols with pcb layer
908: * code - like udp/tcp/raw ip.
909: */
910: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
911: ipsec4_in_reject(m, NULL)) {
912: ipsecstat.in_polvio++;
913: goto bad;
914: }
915: #endif
1.173 jonathan 916: #if FAST_IPSEC
917: /*
918: * enforce IPsec policy checking if we are seeing last header.
919: * note that we do not visit this with protocols with pcb layer
920: * code - like udp/tcp/raw ip.
921: */
922: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
923: /*
924: * Check if the packet has already had IPsec processing
925: * done. If so, then just pass it along. This tag gets
926: * set during AH, ESP, etc. input handling, before the
927: * packet is returned to the ip input queue for delivery.
928: */
929: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
930: s = splsoftnet();
931: if (mtag != NULL) {
932: tdbi = (struct tdb_ident *)(mtag + 1);
933: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
934: } else {
935: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
936: IP_FORWARDING, &error);
937: }
938: if (sp != NULL) {
939: /*
940: * Check security policy against packet attributes.
941: */
942: error = ipsec_in_reject(sp, m);
943: KEY_FREESP(&sp);
944: } else {
945: /* XXX error stat??? */
946: error = EINVAL;
947: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
948: goto bad;
949: }
950: splx(s);
951: if (error)
952: goto bad;
953: }
954: #endif /* FAST_IPSEC */
1.1 cgd 955:
956: /*
957: * Switch out to protocol's input routine.
958: */
1.82 aidan 959: #if IFA_STATS
1.122 itojun 960: if (ia && ip)
1.155 itojun 961: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 962: #endif
1.1 cgd 963: ipstat.ips_delivered++;
1.89 itojun 964: {
965: int off = hlen, nh = ip->ip_p;
966:
967: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
968: return;
969: }
1.1 cgd 970: bad:
971: m_freem(m);
1.135 thorpej 972: return;
973:
974: badcsum:
975: ipstat.ips_badsum++;
976: m_freem(m);
1.1 cgd 977: }
978:
979: /*
980: * Take incoming datagram fragment and try to
981: * reassemble it into whole datagram. If a chain for
982: * reassembly of this datagram already exists, then it
983: * is given as fp; otherwise have to make a chain.
984: */
1.50 thorpej 985: struct mbuf *
1.190 ! jonathan 986: ip_reass(ipqe, fp, ipqhead)
1.109 augustss 987: struct ipqent *ipqe;
988: struct ipq *fp;
1.190 ! jonathan 989: struct ipqhead *ipqhead;
1.1 cgd 990: {
1.109 augustss 991: struct mbuf *m = ipqe->ipqe_m;
992: struct ipqent *nq, *p, *q;
1.25 cgd 993: struct ip *ip;
1.1 cgd 994: struct mbuf *t;
1.25 cgd 995: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 996: int i, next;
997:
1.75 thorpej 998: IPQ_LOCK_CHECK();
999:
1.1 cgd 1000: /*
1001: * Presence of header sizes in mbufs
1002: * would confuse code below.
1003: */
1004: m->m_data += hlen;
1005: m->m_len -= hlen;
1006:
1007: /*
1008: * If first fragment to arrive, create a reassembly queue.
1009: */
1010: if (fp == 0) {
1.131 itojun 1011: /*
1012: * Enforce upper bound on number of fragmented packets
1013: * for which we attempt reassembly;
1014: * If maxfrag is 0, never accept fragments.
1015: * If maxfrag is -1, accept all fragments without limitation.
1016: */
1017: if (ip_maxfragpackets < 0)
1018: ;
1019: else if (ip_nfragpackets >= ip_maxfragpackets)
1020: goto dropfrag;
1021: ip_nfragpackets++;
1.50 thorpej 1022: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1023: M_FTABLE, M_NOWAIT);
1024: if (fp == NULL)
1.1 cgd 1025: goto dropfrag;
1.190 ! jonathan 1026: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.1 cgd 1027: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1028: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1029: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.148 matt 1030: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1031: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1032: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1033: p = NULL;
1.1 cgd 1034: goto insert;
1035: }
1036:
1037: /*
1038: * Find a segment which begins after this one does.
1039: */
1.148 matt 1040: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1041: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1042: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1043: break;
1044:
1045: /*
1046: * If there is a preceding segment, it may provide some of
1047: * our data already. If so, drop the data from the incoming
1048: * segment. If it provides all of our data, drop us.
1049: */
1.25 cgd 1050: if (p != NULL) {
1.155 itojun 1051: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1052: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1053: if (i > 0) {
1.155 itojun 1054: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1055: goto dropfrag;
1.50 thorpej 1056: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1057: ipqe->ipqe_ip->ip_off =
1058: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1059: ipqe->ipqe_ip->ip_len =
1060: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1061: }
1062: }
1063:
1064: /*
1065: * While we overlap succeeding segments trim them or,
1066: * if they are completely covered, dequeue them.
1067: */
1.155 itojun 1068: for (; q != NULL &&
1069: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1070: ntohs(q->ipqe_ip->ip_off); q = nq) {
1071: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1072: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1073: if (i < ntohs(q->ipqe_ip->ip_len)) {
1074: q->ipqe_ip->ip_len =
1075: htons(ntohs(q->ipqe_ip->ip_len) - i);
1076: q->ipqe_ip->ip_off =
1077: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1078: m_adj(q->ipqe_m, i);
1.1 cgd 1079: break;
1080: }
1.148 matt 1081: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1082: m_freem(q->ipqe_m);
1.148 matt 1083: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1084: pool_put(&ipqent_pool, q);
1.1 cgd 1085: }
1086:
1087: insert:
1088: /*
1089: * Stick new segment in its place;
1090: * check for complete reassembly.
1091: */
1.25 cgd 1092: if (p == NULL) {
1.148 matt 1093: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1094: } else {
1.148 matt 1095: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1096: }
1.1 cgd 1097: next = 0;
1.148 matt 1098: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1099: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1100: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1101: return (0);
1.155 itojun 1102: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1103: }
1.25 cgd 1104: if (p->ipqe_mff)
1.1 cgd 1105: return (0);
1106:
1107: /*
1.41 thorpej 1108: * Reassembly is complete. Check for a bogus message size and
1109: * concatenate fragments.
1.1 cgd 1110: */
1.148 matt 1111: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1112: ip = q->ipqe_ip;
1.41 thorpej 1113: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1114: ipstat.ips_toolong++;
1115: ip_freef(fp);
1116: return (0);
1117: }
1.50 thorpej 1118: m = q->ipqe_m;
1.1 cgd 1119: t = m->m_next;
1120: m->m_next = 0;
1121: m_cat(m, t);
1.148 matt 1122: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1123: pool_put(&ipqent_pool, q);
1.25 cgd 1124: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1125: t = q->ipqe_m;
1.148 matt 1126: nq = TAILQ_NEXT(q, ipqe_q);
1.72 thorpej 1127: pool_put(&ipqent_pool, q);
1.1 cgd 1128: m_cat(m, t);
1129: }
1130:
1131: /*
1132: * Create header for new ip packet by
1133: * modifying header of first packet;
1134: * dequeue and discard fragment reassembly header.
1135: * Make header visible.
1136: */
1.155 itojun 1137: ip->ip_len = htons(next);
1.25 cgd 1138: ip->ip_src = fp->ipq_src;
1139: ip->ip_dst = fp->ipq_dst;
1140: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1141: FREE(fp, M_FTABLE);
1.131 itojun 1142: ip_nfragpackets--;
1.1 cgd 1143: m->m_len += (ip->ip_hl << 2);
1144: m->m_data -= (ip->ip_hl << 2);
1145: /* some debugging cruft by sklower, below, will go away soon */
1146: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1147: int plen = 0;
1.50 thorpej 1148: for (t = m; t; t = t->m_next)
1149: plen += t->m_len;
1150: m->m_pkthdr.len = plen;
1.1 cgd 1151: }
1.50 thorpej 1152: return (m);
1.1 cgd 1153:
1154: dropfrag:
1155: ipstat.ips_fragdropped++;
1156: m_freem(m);
1.72 thorpej 1157: pool_put(&ipqent_pool, ipqe);
1.1 cgd 1158: return (0);
1159: }
1160:
1161: /*
1162: * Free a fragment reassembly header and all
1163: * associated datagrams.
1164: */
1.8 mycroft 1165: void
1.1 cgd 1166: ip_freef(fp)
1167: struct ipq *fp;
1168: {
1.109 augustss 1169: struct ipqent *q, *p;
1.1 cgd 1170:
1.75 thorpej 1171: IPQ_LOCK_CHECK();
1172:
1.148 matt 1173: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1174: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1175: m_freem(q->ipqe_m);
1.148 matt 1176: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.72 thorpej 1177: pool_put(&ipqent_pool, q);
1.1 cgd 1178: }
1.25 cgd 1179: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1180: FREE(fp, M_FTABLE);
1.131 itojun 1181: ip_nfragpackets--;
1.1 cgd 1182: }
1183:
1184: /*
1185: * IP timer processing;
1186: * if a timer expires on a reassembly
1187: * queue, discard it.
1188: */
1.8 mycroft 1189: void
1.1 cgd 1190: ip_slowtimo()
1191: {
1.190 ! jonathan 1192: static unsigned dropscanidx = 0;
! 1193: unsigned i;
1.109 augustss 1194: struct ipq *fp, *nfp;
1.24 mycroft 1195: int s = splsoftnet();
1.1 cgd 1196:
1.75 thorpej 1197: IPQ_LOCK();
1.190 ! jonathan 1198: for (i = 0; i < IPREASS_NHASH; i++) {
! 1199: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
! 1200: nfp = LIST_NEXT(fp, ipq_q);
! 1201: if (--fp->ipq_ttl == 0) {
! 1202: ipstat.ips_fragtimeout++;
! 1203: ip_freef(fp);
! 1204: }
1.1 cgd 1205: }
1206: }
1.131 itojun 1207: /*
1208: * If we are over the maximum number of fragments
1209: * (due to the limit being lowered), drain off
1.190 ! jonathan 1210: * enough to get down to the new limit. Start draining
! 1211: * from the reassembly hashqueue most recently drained.
1.131 itojun 1212: */
1213: if (ip_maxfragpackets < 0)
1214: ;
1215: else {
1.190 ! jonathan 1216: int wrapped = 0;
! 1217:
! 1218: i = dropscanidx;
! 1219: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
! 1220: while (LIST_FIRST(&ipq[i]) != NULL)
! 1221: ip_freef(LIST_FIRST(&ipq[i]));
! 1222: if (++i >= IPREASS_NHASH) {
! 1223: i = 0;
! 1224: }
! 1225: /*
! 1226: * Dont scan forever even if fragment counters are
! 1227: * wrong: stop after scanning entire reassembly queue.
! 1228: */
! 1229: if (i == dropscanidx)
! 1230: wrapped = 1;
! 1231: }
! 1232: dropscanidx = i;
1.131 itojun 1233: }
1.75 thorpej 1234: IPQ_UNLOCK();
1.63 matt 1235: #ifdef GATEWAY
1236: ipflow_slowtimo();
1237: #endif
1.1 cgd 1238: splx(s);
1239: }
1240:
1241: /*
1242: * Drain off all datagram fragments.
1243: */
1.8 mycroft 1244: void
1.1 cgd 1245: ip_drain()
1246: {
1.190 ! jonathan 1247: int i;
1.1 cgd 1248:
1.75 thorpej 1249: /*
1250: * We may be called from a device's interrupt context. If
1251: * the ipq is already busy, just bail out now.
1252: */
1253: if (ipq_lock_try() == 0)
1254: return;
1255:
1.190 ! jonathan 1256: for (i = 0; i < IPREASS_NHASH; i++) {
! 1257: struct ipqhead *ipqh = &ipq[i];
! 1258: struct ipq *fp, *nfp;
! 1259: for (fp = LIST_FIRST(ipqh); fp != NULL; fp = nfp) {
! 1260: nfp = LIST_NEXT(fp, ipq_q);
! 1261: ip_freef(fp);
! 1262: ipstat.ips_fragdropped++;
! 1263: }
1.1 cgd 1264: }
1.75 thorpej 1265:
1266: IPQ_UNLOCK();
1.1 cgd 1267: }
1268:
1269: /*
1270: * Do option processing on a datagram,
1271: * possibly discarding it if bad options are encountered,
1272: * or forwarding it if source-routed.
1273: * Returns 1 if packet has been forwarded/freed,
1274: * 0 if the packet should be processed further.
1275: */
1.8 mycroft 1276: int
1.1 cgd 1277: ip_dooptions(m)
1278: struct mbuf *m;
1279: {
1.109 augustss 1280: struct ip *ip = mtod(m, struct ip *);
1281: u_char *cp, *cp0;
1282: struct ip_timestamp *ipt;
1283: struct in_ifaddr *ia;
1.1 cgd 1284: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1285: struct in_addr dst;
1.1 cgd 1286: n_time ntime;
1287:
1.13 mycroft 1288: dst = ip->ip_dst;
1.1 cgd 1289: cp = (u_char *)(ip + 1);
1290: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1291: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1292: opt = cp[IPOPT_OPTVAL];
1293: if (opt == IPOPT_EOL)
1294: break;
1295: if (opt == IPOPT_NOP)
1296: optlen = 1;
1297: else {
1.113 itojun 1298: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1299: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1300: goto bad;
1301: }
1.1 cgd 1302: optlen = cp[IPOPT_OLEN];
1.114 itojun 1303: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1304: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1305: goto bad;
1306: }
1307: }
1308: switch (opt) {
1309:
1310: default:
1311: break;
1312:
1313: /*
1314: * Source routing with record.
1315: * Find interface with current destination address.
1316: * If none on this machine then drop if strictly routed,
1317: * or do nothing if loosely routed.
1318: * Record interface address and bring up next address
1319: * component. If strictly routed make sure next
1320: * address is on directly accessible net.
1321: */
1322: case IPOPT_LSRR:
1323: case IPOPT_SSRR:
1.47 cjs 1324: if (ip_allowsrcrt == 0) {
1325: type = ICMP_UNREACH;
1326: code = ICMP_UNREACH_NET_PROHIB;
1327: goto bad;
1328: }
1.114 itojun 1329: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1330: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1331: goto bad;
1332: }
1.1 cgd 1333: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1334: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1335: goto bad;
1336: }
1337: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1338: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1339: if (ia == 0) {
1340: if (opt == IPOPT_SSRR) {
1341: type = ICMP_UNREACH;
1342: code = ICMP_UNREACH_SRCFAIL;
1343: goto bad;
1344: }
1345: /*
1346: * Loose routing, and not at next destination
1347: * yet; nothing to do except forward.
1348: */
1349: break;
1350: }
1351: off--; /* 0 origin */
1.112 sommerfe 1352: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1353: /*
1354: * End of source route. Should be for us.
1355: */
1356: save_rte(cp, ip->ip_src);
1357: break;
1358: }
1359: /*
1360: * locate outgoing interface
1361: */
1362: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1363: sizeof(ipaddr.sin_addr));
1.96 thorpej 1364: if (opt == IPOPT_SSRR)
1365: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1366: else
1.1 cgd 1367: ia = ip_rtaddr(ipaddr.sin_addr);
1368: if (ia == 0) {
1369: type = ICMP_UNREACH;
1370: code = ICMP_UNREACH_SRCFAIL;
1371: goto bad;
1372: }
1373: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1374: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1375: (caddr_t)(cp + off), sizeof(struct in_addr));
1376: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1377: /*
1378: * Let ip_intr's mcast routing check handle mcast pkts
1379: */
1.18 mycroft 1380: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1381: break;
1382:
1383: case IPOPT_RR:
1.114 itojun 1384: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1385: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1386: goto bad;
1387: }
1.1 cgd 1388: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1389: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1390: goto bad;
1391: }
1392: /*
1393: * If no space remains, ignore.
1394: */
1395: off--; /* 0 origin */
1.112 sommerfe 1396: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1397: break;
1398: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1399: sizeof(ipaddr.sin_addr));
1400: /*
1401: * locate outgoing interface; if we're the destination,
1402: * use the incoming interface (should be same).
1403: */
1.96 thorpej 1404: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1405: == NULL &&
1406: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1407: type = ICMP_UNREACH;
1408: code = ICMP_UNREACH_HOST;
1409: goto bad;
1410: }
1.20 mycroft 1411: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1412: (caddr_t)(cp + off), sizeof(struct in_addr));
1413: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1414: break;
1415:
1416: case IPOPT_TS:
1417: code = cp - (u_char *)ip;
1418: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1419: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1420: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1421: goto bad;
1.114 itojun 1422: }
1423: if (ipt->ipt_ptr < 5) {
1424: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1425: goto bad;
1426: }
1.15 cgd 1427: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1428: if (++ipt->ipt_oflw == 0) {
1429: code = (u_char *)&ipt->ipt_ptr -
1430: (u_char *)ip;
1.1 cgd 1431: goto bad;
1.114 itojun 1432: }
1.1 cgd 1433: break;
1434: }
1.104 thorpej 1435: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1436: switch (ipt->ipt_flg) {
1437:
1438: case IPOPT_TS_TSONLY:
1439: break;
1440:
1441: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1442: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1443: sizeof(struct in_addr) > ipt->ipt_len) {
1444: code = (u_char *)&ipt->ipt_ptr -
1445: (u_char *)ip;
1.1 cgd 1446: goto bad;
1.114 itojun 1447: }
1.13 mycroft 1448: ipaddr.sin_addr = dst;
1.96 thorpej 1449: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1450: m->m_pkthdr.rcvif));
1.13 mycroft 1451: if (ia == 0)
1452: continue;
1.104 thorpej 1453: bcopy(&ia->ia_addr.sin_addr,
1454: cp0, sizeof(struct in_addr));
1.1 cgd 1455: ipt->ipt_ptr += sizeof(struct in_addr);
1456: break;
1457:
1458: case IPOPT_TS_PRESPEC:
1.66 thorpej 1459: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1460: sizeof(struct in_addr) > ipt->ipt_len) {
1461: code = (u_char *)&ipt->ipt_ptr -
1462: (u_char *)ip;
1.1 cgd 1463: goto bad;
1.114 itojun 1464: }
1.104 thorpej 1465: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1466: sizeof(struct in_addr));
1.96 thorpej 1467: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1468: == NULL)
1.1 cgd 1469: continue;
1470: ipt->ipt_ptr += sizeof(struct in_addr);
1471: break;
1472:
1473: default:
1.114 itojun 1474: /* XXX can't take &ipt->ipt_flg */
1475: code = (u_char *)&ipt->ipt_ptr -
1476: (u_char *)ip + 1;
1.1 cgd 1477: goto bad;
1478: }
1479: ntime = iptime();
1.107 thorpej 1480: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1481: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1482: sizeof(n_time));
1483: ipt->ipt_ptr += sizeof(n_time);
1484: }
1485: }
1486: if (forward) {
1.26 thorpej 1487: if (ip_forwsrcrt == 0) {
1488: type = ICMP_UNREACH;
1489: code = ICMP_UNREACH_SRCFAIL;
1490: goto bad;
1491: }
1.1 cgd 1492: ip_forward(m, 1);
1493: return (1);
1.13 mycroft 1494: }
1495: return (0);
1.1 cgd 1496: bad:
1.13 mycroft 1497: icmp_error(m, type, code, 0, 0);
1498: ipstat.ips_badoptions++;
1.1 cgd 1499: return (1);
1500: }
1501:
1502: /*
1503: * Given address of next destination (final or next hop),
1504: * return internet address info of interface to be used to get there.
1505: */
1506: struct in_ifaddr *
1507: ip_rtaddr(dst)
1508: struct in_addr dst;
1509: {
1.109 augustss 1510: struct sockaddr_in *sin;
1.1 cgd 1511:
1.19 mycroft 1512: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1513:
1.35 mycroft 1514: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1515: if (ipforward_rt.ro_rt) {
1516: RTFREE(ipforward_rt.ro_rt);
1517: ipforward_rt.ro_rt = 0;
1518: }
1519: sin->sin_family = AF_INET;
1520: sin->sin_len = sizeof(*sin);
1521: sin->sin_addr = dst;
1522:
1523: rtalloc(&ipforward_rt);
1524: }
1525: if (ipforward_rt.ro_rt == 0)
1526: return ((struct in_ifaddr *)0);
1.19 mycroft 1527: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1528: }
1529:
1530: /*
1531: * Save incoming source route for use in replies,
1532: * to be picked up later by ip_srcroute if the receiver is interested.
1533: */
1.13 mycroft 1534: void
1.1 cgd 1535: save_rte(option, dst)
1536: u_char *option;
1537: struct in_addr dst;
1538: {
1539: unsigned olen;
1540:
1541: olen = option[IPOPT_OLEN];
1542: #ifdef DIAGNOSTIC
1543: if (ipprintfs)
1.39 christos 1544: printf("save_rte: olen %d\n", olen);
1.89 itojun 1545: #endif /* 0 */
1.1 cgd 1546: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1547: return;
1548: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1549: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1550: ip_srcrt.dst = dst;
1551: }
1552:
1553: /*
1554: * Retrieve incoming source route for use in replies,
1555: * in the same form used by setsockopt.
1556: * The first hop is placed before the options, will be removed later.
1557: */
1558: struct mbuf *
1559: ip_srcroute()
1560: {
1.109 augustss 1561: struct in_addr *p, *q;
1562: struct mbuf *m;
1.1 cgd 1563:
1564: if (ip_nhops == 0)
1565: return ((struct mbuf *)0);
1566: m = m_get(M_DONTWAIT, MT_SOOPTS);
1567: if (m == 0)
1568: return ((struct mbuf *)0);
1569:
1.164 matt 1570: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1571: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1572:
1573: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1574: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1575: OPTSIZ;
1576: #ifdef DIAGNOSTIC
1577: if (ipprintfs)
1.39 christos 1578: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1579: #endif
1580:
1581: /*
1582: * First save first hop for return route
1583: */
1584: p = &ip_srcrt.route[ip_nhops - 1];
1585: *(mtod(m, struct in_addr *)) = *p--;
1586: #ifdef DIAGNOSTIC
1587: if (ipprintfs)
1.39 christos 1588: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1589: #endif
1590:
1591: /*
1592: * Copy option fields and padding (nop) to mbuf.
1593: */
1594: ip_srcrt.nop = IPOPT_NOP;
1595: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1596: bcopy((caddr_t)&ip_srcrt.nop,
1597: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1598: q = (struct in_addr *)(mtod(m, caddr_t) +
1599: sizeof(struct in_addr) + OPTSIZ);
1600: #undef OPTSIZ
1601: /*
1602: * Record return path as an IP source route,
1603: * reversing the path (pointers are now aligned).
1604: */
1605: while (p >= ip_srcrt.route) {
1606: #ifdef DIAGNOSTIC
1607: if (ipprintfs)
1.39 christos 1608: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1609: #endif
1610: *q++ = *p--;
1611: }
1612: /*
1613: * Last hop goes to final destination.
1614: */
1615: *q = ip_srcrt.dst;
1616: #ifdef DIAGNOSTIC
1617: if (ipprintfs)
1.39 christos 1618: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1619: #endif
1620: return (m);
1621: }
1622:
1623: /*
1624: * Strip out IP options, at higher
1625: * level protocol in the kernel.
1626: * Second argument is buffer to which options
1627: * will be moved, and return value is their length.
1628: * XXX should be deleted; last arg currently ignored.
1629: */
1.8 mycroft 1630: void
1.1 cgd 1631: ip_stripoptions(m, mopt)
1.109 augustss 1632: struct mbuf *m;
1.1 cgd 1633: struct mbuf *mopt;
1634: {
1.109 augustss 1635: int i;
1.1 cgd 1636: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1637: caddr_t opts;
1.1 cgd 1638: int olen;
1639:
1.79 mycroft 1640: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1641: opts = (caddr_t)(ip + 1);
1642: i = m->m_len - (sizeof (struct ip) + olen);
1643: bcopy(opts + olen, opts, (unsigned)i);
1644: m->m_len -= olen;
1645: if (m->m_flags & M_PKTHDR)
1646: m->m_pkthdr.len -= olen;
1.155 itojun 1647: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
1.79 mycroft 1648: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1649: }
1650:
1.139 matt 1651: const int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1652: 0, 0, 0, 0,
1653: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1654: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1655: EMSGSIZE, EHOSTUNREACH, 0, 0,
1656: 0, 0, 0, 0,
1657: ENOPROTOOPT
1658: };
1659:
1660: /*
1661: * Forward a packet. If some error occurs return the sender
1662: * an icmp packet. Note we can't always generate a meaningful
1663: * icmp message because icmp doesn't have a large enough repertoire
1664: * of codes and types.
1665: *
1666: * If not forwarding, just drop the packet. This could be confusing
1667: * if ipforwarding was zero but some routing protocol was advancing
1668: * us as a gateway to somewhere. However, we must let the routing
1669: * protocol deal with that.
1670: *
1671: * The srcrt parameter indicates whether the packet is being forwarded
1672: * via a source route.
1673: */
1.13 mycroft 1674: void
1.1 cgd 1675: ip_forward(m, srcrt)
1676: struct mbuf *m;
1677: int srcrt;
1678: {
1.109 augustss 1679: struct ip *ip = mtod(m, struct ip *);
1680: struct sockaddr_in *sin;
1681: struct rtentry *rt;
1.28 christos 1682: int error, type = 0, code = 0;
1.1 cgd 1683: struct mbuf *mcopy;
1.13 mycroft 1684: n_long dest;
1685: struct ifnet *destifp;
1.173 jonathan 1686: #if defined(IPSEC) || defined(FAST_IPSEC)
1.89 itojun 1687: struct ifnet dummyifp;
1688: #endif
1.164 matt 1689:
1690: /*
1691: * We are now in the output path.
1692: */
1693: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1694:
1695: /*
1696: * Clear any in-bound checksum flags for this packet.
1697: */
1698: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1699:
1.13 mycroft 1700: dest = 0;
1.1 cgd 1701: #ifdef DIAGNOSTIC
1702: if (ipprintfs)
1.70 thorpej 1703: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1704: ntohl(ip->ip_src.s_addr),
1705: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1706: #endif
1.93 sommerfe 1707: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1708: ipstat.ips_cantforward++;
1709: m_freem(m);
1710: return;
1711: }
1712: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1713: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1714: return;
1715: }
1716: ip->ip_ttl -= IPTTLDEC;
1717:
1.19 mycroft 1718: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1719: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1720: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1721: if (ipforward_rt.ro_rt) {
1722: RTFREE(ipforward_rt.ro_rt);
1723: ipforward_rt.ro_rt = 0;
1724: }
1725: sin->sin_family = AF_INET;
1.35 mycroft 1726: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1727: sin->sin_addr = ip->ip_dst;
1728:
1729: rtalloc(&ipforward_rt);
1730: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1731: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1732: return;
1733: }
1734: rt = ipforward_rt.ro_rt;
1735: }
1736:
1737: /*
1.34 mycroft 1738: * Save at most 68 bytes of the packet in case
1.1 cgd 1739: * we need to generate an ICMP message to the src.
1.119 itojun 1740: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1741: */
1.155 itojun 1742: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1743: if (mcopy)
1744: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1745:
1746: /*
1747: * If forwarding packet using same interface that it came in on,
1748: * perhaps should send a redirect to sender to shortcut a hop.
1749: * Only send redirect if source is sending directly to us,
1750: * and if packet was not source routed (or has any options).
1751: * Also, don't send redirect if forwarding using a default route
1752: * or a route modified by a redirect.
1753: */
1754: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1755: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1756: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1757: ipsendredirects && !srcrt) {
1.19 mycroft 1758: if (rt->rt_ifa &&
1759: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1760: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1761: if (rt->rt_flags & RTF_GATEWAY)
1762: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1763: else
1764: dest = ip->ip_dst.s_addr;
1765: /*
1766: * Router requirements says to only send host
1767: * redirects.
1768: */
1769: type = ICMP_REDIRECT;
1770: code = ICMP_REDIRECT_HOST;
1.1 cgd 1771: #ifdef DIAGNOSTIC
1.77 thorpej 1772: if (ipprintfs)
1773: printf("redirect (%d) to %x\n", code,
1774: (u_int32_t)dest);
1.1 cgd 1775: #endif
1776: }
1777: }
1778:
1.27 thorpej 1779: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1.173 jonathan 1780: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1781: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1782:
1.1 cgd 1783: if (error)
1784: ipstat.ips_cantforward++;
1785: else {
1786: ipstat.ips_forward++;
1787: if (type)
1788: ipstat.ips_redirectsent++;
1789: else {
1.63 matt 1790: if (mcopy) {
1791: #ifdef GATEWAY
1.64 thorpej 1792: if (mcopy->m_flags & M_CANFASTFWD)
1793: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1794: #endif
1.1 cgd 1795: m_freem(mcopy);
1.63 matt 1796: }
1.1 cgd 1797: return;
1798: }
1799: }
1800: if (mcopy == NULL)
1801: return;
1.13 mycroft 1802: destifp = NULL;
1803:
1.1 cgd 1804: switch (error) {
1805:
1806: case 0: /* forwarded, but need redirect */
1807: /* type, code set above */
1808: break;
1809:
1810: case ENETUNREACH: /* shouldn't happen, checked above */
1811: case EHOSTUNREACH:
1812: case ENETDOWN:
1813: case EHOSTDOWN:
1814: default:
1815: type = ICMP_UNREACH;
1816: code = ICMP_UNREACH_HOST;
1817: break;
1818:
1819: case EMSGSIZE:
1820: type = ICMP_UNREACH;
1821: code = ICMP_UNREACH_NEEDFRAG;
1.173 jonathan 1822: #if !defined(IPSEC) && !defined(FAST_IPSEC)
1.13 mycroft 1823: if (ipforward_rt.ro_rt)
1824: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1825: #else
1826: /*
1827: * If the packet is routed over IPsec tunnel, tell the
1828: * originator the tunnel MTU.
1829: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1830: * XXX quickhack!!!
1831: */
1832: if (ipforward_rt.ro_rt) {
1833: struct secpolicy *sp;
1834: int ipsecerror;
1.95 itojun 1835: size_t ipsechdr;
1.89 itojun 1836: struct route *ro;
1837:
1838: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1839: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1840: &ipsecerror);
1.89 itojun 1841:
1842: if (sp == NULL)
1843: destifp = ipforward_rt.ro_rt->rt_ifp;
1844: else {
1845: /* count IPsec header size */
1.95 itojun 1846: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1847: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1848:
1849: /*
1850: * find the correct route for outer IPv4
1851: * header, compute tunnel MTU.
1852: *
1853: * XXX BUG ALERT
1854: * The "dummyifp" code relies upon the fact
1855: * that icmp_error() touches only ifp->if_mtu.
1856: */
1857: /*XXX*/
1858: destifp = NULL;
1859: if (sp->req != NULL
1.95 itojun 1860: && sp->req->sav != NULL
1861: && sp->req->sav->sah != NULL) {
1862: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1863: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1864: dummyifp.if_mtu =
1.151 itojun 1865: ro->ro_rt->rt_rmx.rmx_mtu ?
1866: ro->ro_rt->rt_rmx.rmx_mtu :
1.89 itojun 1867: ro->ro_rt->rt_ifp->if_mtu;
1868: dummyifp.if_mtu -= ipsechdr;
1869: destifp = &dummyifp;
1870: }
1871: }
1872:
1.173 jonathan 1873: #ifdef IPSEC
1.89 itojun 1874: key_freesp(sp);
1.173 jonathan 1875: #else
1876: KEY_FREESP(&sp);
1877: #endif
1.89 itojun 1878: }
1879: }
1880: #endif /*IPSEC*/
1.1 cgd 1881: ipstat.ips_cantfrag++;
1882: break;
1883:
1884: case ENOBUFS:
1.143 itojun 1885: #if 1
1886: /*
1887: * a router should not generate ICMP_SOURCEQUENCH as
1888: * required in RFC1812 Requirements for IP Version 4 Routers.
1889: * source quench could be a big problem under DoS attacks,
1.149 wiz 1890: * or if the underlying interface is rate-limited.
1.143 itojun 1891: */
1892: if (mcopy)
1893: m_freem(mcopy);
1894: return;
1895: #else
1.1 cgd 1896: type = ICMP_SOURCEQUENCH;
1897: code = 0;
1898: break;
1.143 itojun 1899: #endif
1.1 cgd 1900: }
1.13 mycroft 1901: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1902: }
1903:
1904: void
1905: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1906: struct inpcb *inp;
1907: struct mbuf **mp;
1908: struct ip *ip;
1909: struct mbuf *m;
1.44 thorpej 1910: {
1911:
1912: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1913: struct timeval tv;
1914:
1915: microtime(&tv);
1916: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1917: SCM_TIMESTAMP, SOL_SOCKET);
1918: if (*mp)
1919: mp = &(*mp)->m_next;
1920: }
1921: if (inp->inp_flags & INP_RECVDSTADDR) {
1922: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1923: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1924: if (*mp)
1925: mp = &(*mp)->m_next;
1926: }
1927: #ifdef notyet
1928: /*
1929: * XXX
1930: * Moving these out of udp_input() made them even more broken
1931: * than they already were.
1932: * - fenner@parc.xerox.com
1933: */
1934: /* options were tossed already */
1935: if (inp->inp_flags & INP_RECVOPTS) {
1936: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1937: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1938: if (*mp)
1939: mp = &(*mp)->m_next;
1940: }
1941: /* ip_srcroute doesn't do what we want here, need to fix */
1942: if (inp->inp_flags & INP_RECVRETOPTS) {
1943: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1944: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1945: if (*mp)
1946: mp = &(*mp)->m_next;
1947: }
1948: #endif
1949: if (inp->inp_flags & INP_RECVIF) {
1950: struct sockaddr_dl sdl;
1951:
1952: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1953: sdl.sdl_family = AF_LINK;
1954: sdl.sdl_index = m->m_pkthdr.rcvif ?
1955: m->m_pkthdr.rcvif->if_index : 0;
1956: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1957: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1958: IP_RECVIF, IPPROTO_IP);
1959: if (*mp)
1960: mp = &(*mp)->m_next;
1961: }
1.13 mycroft 1962: }
1963:
1.189 atatat 1964: /*
1965: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1966: * range of the new value and tweaks timers if it changes.
1967: */
1968: static int
1969: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1970: {
1.189 atatat 1971: int error, tmp;
1972: struct sysctlnode node;
1973:
1974: node = *rnode;
1975: tmp = ip_mtudisc_timeout;
1976: node.sysctl_data = &tmp;
1977: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1978: if (error || newp == NULL)
1979: return (error);
1980: if (tmp < 0)
1981: return (EINVAL);
1.52 thorpej 1982:
1.189 atatat 1983: ip_mtudisc_timeout = tmp;
1984: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1985:
1986: return (0);
1987: }
1.54 lukem 1988:
1.65 matt 1989: #ifdef GATEWAY
1.189 atatat 1990: /*
1991: * sysctl helper routine for net.inet.ip.maxflows. apparently if
1992: * maxflows is even looked up, we "reap flows".
1993: */
1994: static int
1995: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
1996: {
1997: int s;
1.67 thorpej 1998:
1.189 atatat 1999: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
2000: if (s)
2001: return (s);
2002:
2003: s = splsoftnet();
2004: ipflow_reap(0);
2005: splx(s);
1.144 martin 2006:
1.189 atatat 2007: return (0);
2008: }
2009: #endif /* GATEWAY */
1.117 tron 2010:
1.131 itojun 2011:
1.189 atatat 2012: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2013: {
2014: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2015:
1.189 atatat 2016: sysctl_createv(SYSCTL_PERMANENT,
2017: CTLTYPE_NODE, "net", NULL,
2018: NULL, 0, NULL, 0,
2019: CTL_NET, CTL_EOL);
2020: sysctl_createv(SYSCTL_PERMANENT,
2021: CTLTYPE_NODE, "inet", NULL,
2022: NULL, 0, NULL, 0,
2023: CTL_NET, PF_INET, CTL_EOL);
2024: sysctl_createv(SYSCTL_PERMANENT,
2025: CTLTYPE_NODE, "ip", NULL,
2026: NULL, 0, NULL, 0,
2027: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
2028:
2029: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2030: CTLTYPE_INT, "forwarding", NULL,
2031: NULL, 0, &ipforwarding, 0,
2032: CTL_NET, PF_INET, IPPROTO_IP,
2033: IPCTL_FORWARDING, CTL_EOL);
2034: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2035: CTLTYPE_INT, "redirect", NULL,
2036: NULL, 0, &ipsendredirects, 0,
2037: CTL_NET, PF_INET, IPPROTO_IP,
2038: IPCTL_SENDREDIRECTS, CTL_EOL);
2039: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2040: CTLTYPE_INT, "ttl", NULL,
2041: NULL, 0, &ip_defttl, 0,
2042: CTL_NET, PF_INET, IPPROTO_IP,
2043: IPCTL_DEFTTL, CTL_EOL);
2044: #ifdef IPCTL_DEFMTU
2045: sysctl_createv(SYSCTL_PERMANENT /* |SYSCTL_READWRITE? */,
2046: CTLTYPE_INT, "mtu", NULL,
2047: NULL, 0, &ip_mtu, 0,
2048: CTL_NET, PF_INET, IPPROTO_IP,
2049: IPCTL_DEFMTU, CTL_EOL);
2050: #endif /* IPCTL_DEFMTU */
2051: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READONLY1,
2052: CTLTYPE_INT, "forwsrcrt", NULL,
2053: NULL, 0, &ip_forwsrcrt, 0,
2054: CTL_NET, PF_INET, IPPROTO_IP,
2055: IPCTL_FORWSRCRT, CTL_EOL);
2056: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2057: CTLTYPE_INT, "directed-broadcast", NULL,
2058: NULL, 0, &ip_directedbcast, 0,
2059: CTL_NET, PF_INET, IPPROTO_IP,
2060: IPCTL_DIRECTEDBCAST, CTL_EOL);
2061: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2062: CTLTYPE_INT, "allowsrcrt", NULL,
2063: NULL, 0, &ip_allowsrcrt, 0,
2064: CTL_NET, PF_INET, IPPROTO_IP,
2065: IPCTL_ALLOWSRCRT, CTL_EOL);
2066: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2067: CTLTYPE_INT, "subnetsarelocal", NULL,
2068: NULL, 0, &subnetsarelocal, 0,
2069: CTL_NET, PF_INET, IPPROTO_IP,
2070: IPCTL_SUBNETSARELOCAL, CTL_EOL);
2071: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2072: CTLTYPE_INT, "mtudisc", NULL,
2073: NULL, 0, &ip_mtudisc, 0,
2074: CTL_NET, PF_INET, IPPROTO_IP,
2075: IPCTL_MTUDISC, CTL_EOL);
2076: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2077: CTLTYPE_INT, "anonportmin", NULL,
2078: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2079: CTL_NET, PF_INET, IPPROTO_IP,
2080: IPCTL_ANONPORTMIN, CTL_EOL);
2081: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2082: CTLTYPE_INT, "anonportmax", NULL,
2083: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2084: CTL_NET, PF_INET, IPPROTO_IP,
2085: IPCTL_ANONPORTMAX, CTL_EOL);
2086: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2087: CTLTYPE_INT, "mtudisctimeout", NULL,
2088: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2089: CTL_NET, PF_INET, IPPROTO_IP,
2090: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2091: #ifdef GATEWAY
2092: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2093: CTLTYPE_INT, "maxflows", NULL,
2094: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2095: CTL_NET, PF_INET, IPPROTO_IP,
2096: IPCTL_MAXFLOWS, CTL_EOL);
2097: #endif /* GATEWAY */
2098: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2099: CTLTYPE_INT, "hostzerobroadcast", NULL,
2100: NULL, 0, &hostzeroisbroadcast, 0,
2101: CTL_NET, PF_INET, IPPROTO_IP,
2102: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2103: #if NGIF > 0
2104: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2105: CTLTYPE_INT, "gifttl", NULL,
2106: NULL, 0, &ip_gif_ttl, 0,
2107: CTL_NET, PF_INET, IPPROTO_IP,
2108: IPCTL_GIF_TTL, CTL_EOL);
2109: #endif /* NGIF */
2110: #ifndef IPNOPRIVPORTS
2111: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2112: CTLTYPE_INT, "lowportmin", NULL,
2113: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2114: CTL_NET, PF_INET, IPPROTO_IP,
2115: IPCTL_LOWPORTMIN, CTL_EOL);
2116: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2117: CTLTYPE_INT, "lowportmax", NULL,
2118: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2119: CTL_NET, PF_INET, IPPROTO_IP,
2120: IPCTL_LOWPORTMAX, CTL_EOL);
2121: #endif /* IPNOPRIVPORTS */
2122: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2123: CTLTYPE_INT, "maxfragpackets", NULL,
2124: NULL, 0, &ip_maxfragpackets, 0,
2125: CTL_NET, PF_INET, IPPROTO_IP,
2126: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2127: #if NGRE > 0
2128: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2129: CTLTYPE_INT, "grettl", NULL,
2130: NULL, 0, &ip_gre_ttl, 0,
2131: CTL_NET, PF_INET, IPPROTO_IP,
2132: IPCTL_GRE_TTL, CTL_EOL);
2133: #endif /* NGRE */
2134: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2135: CTLTYPE_INT, "checkinterface", NULL,
2136: NULL, 0, &ip_checkinterface, 0,
2137: CTL_NET, PF_INET, IPPROTO_IP,
2138: IPCTL_CHECKINTERFACE, CTL_EOL);
2139: sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
2140: CTLTYPE_INT, "random_id", NULL,
2141: NULL, 0, &ip_do_randomid, 0,
2142: CTL_NET, PF_INET, IPPROTO_IP,
2143: IPCTL_RANDOMID, CTL_EOL);
1.1 cgd 2144: }
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