Annotation of src/sys/netinet/ip_input.c, Revision 1.250.6.2
1.250.6.2! dyoung 1: /* $NetBSD: ip_input.c,v 1.250 2007/07/19 20:48:55 dyoung Exp $ */
! 2:
! 3: /*
! 4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
! 5: * All rights reserved.
! 6: *
! 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.
! 18: *
! 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: */
! 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: */
! 68:
! 69: /*
! 70: * Copyright (c) 1982, 1986, 1988, 1993
! 71: * The Regents of the University of California. All rights reserved.
! 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.
! 81: * 3. Neither the name of the University nor the names of its contributors
! 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: *
! 97: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
! 98: */
! 99:
! 100: #include <sys/cdefs.h>
! 101: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.250 2007/07/19 20:48:55 dyoung Exp $");
! 102:
! 103: #include "opt_inet.h"
! 104: #include "opt_gateway.h"
! 105: #include "opt_pfil_hooks.h"
! 106: #include "opt_ipsec.h"
! 107: #include "opt_mrouting.h"
! 108: #include "opt_mbuftrace.h"
! 109: #include "opt_inet_csum.h"
! 110:
! 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>
! 118: #include <sys/socketvar.h>
! 119: #include <sys/errno.h>
! 120: #include <sys/time.h>
! 121: #include <sys/kernel.h>
! 122: #include <sys/pool.h>
! 123: #include <sys/sysctl.h>
! 124: #include <sys/kauth.h>
! 125:
! 126: #include <net/if.h>
! 127: #include <net/if_dl.h>
! 128: #include <net/route.h>
! 129: #include <net/pfil.h>
! 130:
! 131: #include <netinet/in.h>
! 132: #include <netinet/in_systm.h>
! 133: #include <netinet/ip.h>
! 134: #include <netinet/in_pcb.h>
! 135: #include <netinet/in_proto.h>
! 136: #include <netinet/in_var.h>
! 137: #include <netinet/ip_var.h>
! 138: #include <netinet/ip_icmp.h>
! 139: /* just for gif_ttl */
! 140: #include <netinet/in_gif.h>
! 141: #include "gif.h"
! 142: #include <net/if_gre.h>
! 143: #include "gre.h"
! 144:
! 145: #ifdef MROUTING
! 146: #include <netinet/ip_mroute.h>
! 147: #endif
! 148:
! 149: #ifdef IPSEC
! 150: #include <netinet6/ipsec.h>
! 151: #include <netkey/key.h>
! 152: #endif
! 153: #ifdef FAST_IPSEC
! 154: #include <netipsec/ipsec.h>
! 155: #include <netipsec/key.h>
! 156: #endif /* FAST_IPSEC*/
! 157:
! 158: #ifndef IPFORWARDING
! 159: #ifdef GATEWAY
! 160: #define IPFORWARDING 1 /* forward IP packets not for us */
! 161: #else /* GATEWAY */
! 162: #define IPFORWARDING 0 /* don't forward IP packets not for us */
! 163: #endif /* GATEWAY */
! 164: #endif /* IPFORWARDING */
! 165: #ifndef IPSENDREDIRECTS
! 166: #define IPSENDREDIRECTS 1
! 167: #endif
! 168: #ifndef IPFORWSRCRT
! 169: #define IPFORWSRCRT 1 /* forward source-routed packets */
! 170: #endif
! 171: #ifndef IPALLOWSRCRT
! 172: #define IPALLOWSRCRT 1 /* allow source-routed packets */
! 173: #endif
! 174: #ifndef IPMTUDISC
! 175: #define IPMTUDISC 1
! 176: #endif
! 177: #ifndef IPMTUDISCTIMEOUT
! 178: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
! 179: #endif
! 180:
! 181: /*
! 182: * Note: DIRECTED_BROADCAST is handled this way so that previous
! 183: * configuration using this option will Just Work.
! 184: */
! 185: #ifndef IPDIRECTEDBCAST
! 186: #ifdef DIRECTED_BROADCAST
! 187: #define IPDIRECTEDBCAST 1
! 188: #else
! 189: #define IPDIRECTEDBCAST 0
! 190: #endif /* DIRECTED_BROADCAST */
! 191: #endif /* IPDIRECTEDBCAST */
! 192: int ipforwarding = IPFORWARDING;
! 193: int ipsendredirects = IPSENDREDIRECTS;
! 194: int ip_defttl = IPDEFTTL;
! 195: int ip_forwsrcrt = IPFORWSRCRT;
! 196: int ip_directedbcast = IPDIRECTEDBCAST;
! 197: int ip_allowsrcrt = IPALLOWSRCRT;
! 198: int ip_mtudisc = IPMTUDISC;
! 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
! 200: #ifdef DIAGNOSTIC
! 201: int ipprintfs = 0;
! 202: #endif
! 203:
! 204: int ip_do_randomid = 0;
! 205:
! 206: /*
! 207: * XXX - Setting ip_checkinterface mostly implements the receive side of
! 208: * the Strong ES model described in RFC 1122, but since the routing table
! 209: * and transmit implementation do not implement the Strong ES model,
! 210: * setting this to 1 results in an odd hybrid.
! 211: *
! 212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
! 213: * to translate the destination address to another local interface.
! 214: *
! 215: * XXX - ip_checkinterface must be disabled if you add IP aliases
! 216: * to the loopback interface instead of the interface where the
! 217: * packets for those addresses are received.
! 218: */
! 219: int ip_checkinterface = 0;
! 220:
! 221:
! 222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
! 223:
! 224: int ipqmaxlen = IFQ_MAXLEN;
! 225: u_long in_ifaddrhash; /* size of hash table - 1 */
! 226: int in_ifaddrentries; /* total number of addrs */
! 227: struct in_ifaddrhead in_ifaddrhead;
! 228: struct in_ifaddrhashhead *in_ifaddrhashtbl;
! 229: u_long in_multihash; /* size of hash table - 1 */
! 230: int in_multientries; /* total number of addrs */
! 231: struct in_multihashhead *in_multihashtbl;
! 232: struct ifqueue ipintrq;
! 233: struct ipstat ipstat;
! 234: uint16_t ip_id;
! 235:
! 236: #ifdef PFIL_HOOKS
! 237: struct pfil_head inet_pfil_hook;
! 238: #endif
! 239:
! 240: /*
! 241: * Cached copy of nmbclusters. If nbclusters is different,
! 242: * recalculate IP parameters derived from nmbclusters.
! 243: */
! 244: static int ip_nmbclusters; /* copy of nmbclusters */
! 245: static void ip_nmbclusters_changed(void); /* recalc limits */
! 246:
! 247: #define CHECK_NMBCLUSTER_PARAMS() \
! 248: do { \
! 249: if (__predict_false(ip_nmbclusters != nmbclusters)) \
! 250: ip_nmbclusters_changed(); \
! 251: } while (/*CONSTCOND*/0)
! 252:
! 253: /* IP datagram reassembly queues (hashed) */
! 254: #define IPREASS_NHASH_LOG2 6
! 255: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
! 256: #define IPREASS_HMASK (IPREASS_NHASH - 1)
! 257: #define IPREASS_HASH(x,y) \
! 258: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
! 259: struct ipqhead ipq[IPREASS_NHASH];
! 260: int ipq_locked;
! 261: static int ip_nfragpackets; /* packets in reass queue */
! 262: static int ip_nfrags; /* total fragments in reass queues */
! 263:
! 264: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
! 265: int ip_maxfrags; /* limit on fragments. XXX sysctl */
! 266:
! 267:
! 268: /*
! 269: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
! 270: * IP reassembly queue buffer managment.
! 271: *
! 272: * We keep a count of total IP fragments (NB: not fragmented packets!)
! 273: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
! 274: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
! 275: * total fragments in reassembly queues.This AIMD policy avoids
! 276: * repeatedly deleting single packets under heavy fragmentation load
! 277: * (e.g., from lossy NFS peers).
! 278: */
! 279: static u_int ip_reass_ttl_decr(u_int ticks);
! 280: static void ip_reass_drophalf(void);
! 281:
! 282:
! 283: static inline int ipq_lock_try(void);
! 284: static inline void ipq_unlock(void);
! 285:
! 286: static inline int
! 287: ipq_lock_try(void)
! 288: {
! 289: int s;
! 290:
! 291: /*
! 292: * Use splvm() -- we're blocking things that would cause
! 293: * mbuf allocation.
! 294: */
! 295: s = splvm();
! 296: if (ipq_locked) {
! 297: splx(s);
! 298: return (0);
! 299: }
! 300: ipq_locked = 1;
! 301: splx(s);
! 302: return (1);
! 303: }
! 304:
! 305: static inline void
! 306: ipq_unlock(void)
! 307: {
! 308: int s;
! 309:
! 310: s = splvm();
! 311: ipq_locked = 0;
! 312: splx(s);
! 313: }
! 314:
! 315: #ifdef DIAGNOSTIC
! 316: #define IPQ_LOCK() \
! 317: do { \
! 318: if (ipq_lock_try() == 0) { \
! 319: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
! 320: panic("ipq_lock"); \
! 321: } \
! 322: } while (/*CONSTCOND*/ 0)
! 323: #define IPQ_LOCK_CHECK() \
! 324: do { \
! 325: if (ipq_locked == 0) { \
! 326: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
! 327: panic("ipq lock check"); \
! 328: } \
! 329: } while (/*CONSTCOND*/ 0)
! 330: #else
! 331: #define IPQ_LOCK() (void) ipq_lock_try()
! 332: #define IPQ_LOCK_CHECK() /* nothing */
! 333: #endif
! 334:
! 335: #define IPQ_UNLOCK() ipq_unlock()
! 336:
! 337: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
! 338: IPL_SOFTNET);
! 339: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
! 340: IPL_VM);
! 341:
! 342: #ifdef INET_CSUM_COUNTERS
! 343: #include <sys/device.h>
! 344:
! 345: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
! 346: NULL, "inet", "hwcsum bad");
! 347: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
! 348: NULL, "inet", "hwcsum ok");
! 349: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
! 350: NULL, "inet", "swcsum");
! 351:
! 352: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
! 353:
! 354: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
! 355: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
! 356: EVCNT_ATTACH_STATIC(ip_swcsum);
! 357:
! 358: #else
! 359:
! 360: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
! 361:
! 362: #endif /* INET_CSUM_COUNTERS */
! 363:
! 364: /*
! 365: * We need to save the IP options in case a protocol wants to respond
! 366: * to an incoming packet over the same route if the packet got here
! 367: * using IP source routing. This allows connection establishment and
! 368: * maintenance when the remote end is on a network that is not known
! 369: * to us.
! 370: */
! 371: int ip_nhops = 0;
! 372: static struct ip_srcrt {
! 373: struct in_addr dst; /* final destination */
! 374: char nop; /* one NOP to align */
! 375: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
! 376: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
! 377: } ip_srcrt;
! 378:
! 379: static void save_rte(u_char *, struct in_addr);
! 380:
! 381: #ifdef MBUFTRACE
! 382: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
! 383: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
! 384: #endif
! 385:
! 386: /*
! 387: * Compute IP limits derived from the value of nmbclusters.
! 388: */
! 389: static void
! 390: ip_nmbclusters_changed(void)
! 391: {
! 392: ip_maxfrags = nmbclusters / 4;
! 393: ip_nmbclusters = nmbclusters;
! 394: }
! 395:
! 396: /*
! 397: * IP initialization: fill in IP protocol switch table.
! 398: * All protocols not implemented in kernel go to raw IP protocol handler.
! 399: */
! 400: void
! 401: ip_init(void)
! 402: {
! 403: const struct protosw *pr;
! 404: int i;
! 405:
! 406: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
! 407: if (pr == 0)
! 408: panic("ip_init");
! 409: for (i = 0; i < IPPROTO_MAX; i++)
! 410: ip_protox[i] = pr - inetsw;
! 411: for (pr = inetdomain.dom_protosw;
! 412: pr < inetdomain.dom_protoswNPROTOSW; pr++)
! 413: if (pr->pr_domain->dom_family == PF_INET &&
! 414: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
! 415: ip_protox[pr->pr_protocol] = pr - inetsw;
! 416:
! 417: for (i = 0; i < IPREASS_NHASH; i++)
! 418: LIST_INIT(&ipq[i]);
! 419:
! 420: ip_id = time_second & 0xfffff;
! 421:
! 422: ipintrq.ifq_maxlen = ipqmaxlen;
! 423: ip_nmbclusters_changed();
! 424:
! 425: TAILQ_INIT(&in_ifaddrhead);
! 426: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
! 427: M_WAITOK, &in_ifaddrhash);
! 428: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
! 429: M_WAITOK, &in_multihash);
! 430: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
! 431: #ifdef GATEWAY
! 432: ipflow_init(ip_hashsize);
! 433: #endif
! 434:
! 435: #ifdef PFIL_HOOKS
! 436: /* Register our Packet Filter hook. */
! 437: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
! 438: inet_pfil_hook.ph_af = AF_INET;
! 439: i = pfil_head_register(&inet_pfil_hook);
! 440: if (i != 0)
! 441: printf("ip_init: WARNING: unable to register pfil hook, "
! 442: "error %d\n", i);
! 443: #endif /* PFIL_HOOKS */
! 444:
! 445: #ifdef MBUFTRACE
! 446: MOWNER_ATTACH(&ip_tx_mowner);
! 447: MOWNER_ATTACH(&ip_rx_mowner);
! 448: #endif /* MBUFTRACE */
! 449: }
! 450:
! 451: struct sockaddr_in ipaddr = {
! 452: .sin_len = sizeof(ipaddr),
! 453: .sin_family = AF_INET,
! 454: };
! 455: struct route ipforward_rt;
! 456:
! 457: /*
! 458: * IP software interrupt routine
! 459: */
! 460: void
! 461: ipintr(void)
! 462: {
! 463: int s;
! 464: struct mbuf *m;
! 465:
! 466: while (!IF_IS_EMPTY(&ipintrq)) {
! 467: s = splnet();
! 468: IF_DEQUEUE(&ipintrq, m);
! 469: splx(s);
! 470: if (m == 0)
! 471: return;
! 472: MCLAIM(m, &ip_rx_mowner);
! 473: ip_input(m);
! 474: }
! 475: }
! 476:
! 477: /*
! 478: * Ip input routine. Checksum and byte swap header. If fragmented
! 479: * try to reassemble. Process options. Pass to next level.
! 480: */
! 481: void
! 482: ip_input(struct mbuf *m)
! 483: {
! 484: struct ip *ip = NULL;
! 485: struct ipq *fp;
! 486: struct in_ifaddr *ia;
! 487: struct ifaddr *ifa;
! 488: struct ipqent *ipqe;
! 489: int hlen = 0, mff, len;
! 490: int downmatch;
! 491: int checkif;
! 492: int srcrt = 0;
! 493: int s;
! 494: u_int hash;
! 495: #ifdef FAST_IPSEC
! 496: struct m_tag *mtag;
! 497: struct tdb_ident *tdbi;
! 498: struct secpolicy *sp;
! 499: int error;
! 500: #endif /* FAST_IPSEC */
! 501:
! 502: MCLAIM(m, &ip_rx_mowner);
! 503: #ifdef DIAGNOSTIC
! 504: if ((m->m_flags & M_PKTHDR) == 0)
! 505: panic("ipintr no HDR");
! 506: #endif
! 507:
! 508: /*
! 509: * If no IP addresses have been set yet but the interfaces
! 510: * are receiving, can't do anything with incoming packets yet.
! 511: */
! 512: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
! 513: goto bad;
! 514: ipstat.ips_total++;
! 515: /*
! 516: * If the IP header is not aligned, slurp it up into a new
! 517: * mbuf with space for link headers, in the event we forward
! 518: * it. Otherwise, if it is aligned, make sure the entire
! 519: * base IP header is in the first mbuf of the chain.
! 520: */
! 521: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
! 522: if ((m = m_copyup(m, sizeof(struct ip),
! 523: (max_linkhdr + 3) & ~3)) == NULL) {
! 524: /* XXXJRT new stat, please */
! 525: ipstat.ips_toosmall++;
! 526: return;
! 527: }
! 528: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
! 529: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
! 530: ipstat.ips_toosmall++;
! 531: return;
! 532: }
! 533: }
! 534: ip = mtod(m, struct ip *);
! 535: if (ip->ip_v != IPVERSION) {
! 536: ipstat.ips_badvers++;
! 537: goto bad;
! 538: }
! 539: hlen = ip->ip_hl << 2;
! 540: if (hlen < sizeof(struct ip)) { /* minimum header length */
! 541: ipstat.ips_badhlen++;
! 542: goto bad;
! 543: }
! 544: if (hlen > m->m_len) {
! 545: if ((m = m_pullup(m, hlen)) == 0) {
! 546: ipstat.ips_badhlen++;
! 547: return;
! 548: }
! 549: ip = mtod(m, struct ip *);
! 550: }
! 551:
! 552: /*
! 553: * RFC1122: packets with a multicast source address are
! 554: * not allowed.
! 555: */
! 556: if (IN_MULTICAST(ip->ip_src.s_addr)) {
! 557: ipstat.ips_badaddr++;
! 558: goto bad;
! 559: }
! 560:
! 561: /* 127/8 must not appear on wire - RFC1122 */
! 562: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
! 563: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
! 564: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
! 565: ipstat.ips_badaddr++;
! 566: goto bad;
! 567: }
! 568: }
! 569:
! 570: switch (m->m_pkthdr.csum_flags &
! 571: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
! 572: M_CSUM_IPv4_BAD)) {
! 573: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
! 574: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
! 575: goto badcsum;
! 576:
! 577: case M_CSUM_IPv4:
! 578: /* Checksum was okay. */
! 579: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
! 580: break;
! 581:
! 582: default:
! 583: /*
! 584: * Must compute it ourselves. Maybe skip checksum on
! 585: * loopback interfaces.
! 586: */
! 587: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
! 588: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
! 589: INET_CSUM_COUNTER_INCR(&ip_swcsum);
! 590: if (in_cksum(m, hlen) != 0)
! 591: goto badcsum;
! 592: }
! 593: break;
! 594: }
! 595:
! 596: /* Retrieve the packet length. */
! 597: len = ntohs(ip->ip_len);
! 598:
! 599: /*
! 600: * Check for additional length bogosity
! 601: */
! 602: if (len < hlen) {
! 603: ipstat.ips_badlen++;
! 604: goto bad;
! 605: }
! 606:
! 607: /*
! 608: * Check that the amount of data in the buffers
! 609: * is as at least much as the IP header would have us expect.
! 610: * Trim mbufs if longer than we expect.
! 611: * Drop packet if shorter than we expect.
! 612: */
! 613: if (m->m_pkthdr.len < len) {
! 614: ipstat.ips_tooshort++;
! 615: goto bad;
! 616: }
! 617: if (m->m_pkthdr.len > len) {
! 618: if (m->m_len == m->m_pkthdr.len) {
! 619: m->m_len = len;
! 620: m->m_pkthdr.len = len;
! 621: } else
! 622: m_adj(m, len - m->m_pkthdr.len);
! 623: }
! 624:
! 625: #if defined(IPSEC)
! 626: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
! 627: m->m_flags &= ~M_CANFASTFWD;
! 628: #else
! 629: /*
! 630: * Assume that we can create a fast-forward IP flow entry
! 631: * based on this packet.
! 632: */
! 633: m->m_flags |= M_CANFASTFWD;
! 634: #endif
! 635:
! 636: #ifdef PFIL_HOOKS
! 637: /*
! 638: * Run through list of hooks for input packets. If there are any
! 639: * filters which require that additional packets in the flow are
! 640: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
! 641: * Note that filters must _never_ set this flag, as another filter
! 642: * in the list may have previously cleared it.
! 643: */
! 644: /*
! 645: * let ipfilter look at packet on the wire,
! 646: * not the decapsulated packet.
! 647: */
! 648: #ifdef IPSEC
! 649: if (!ipsec_getnhist(m))
! 650: #elif defined(FAST_IPSEC)
! 651: if (!ipsec_indone(m))
! 652: #else
! 653: if (1)
! 654: #endif
! 655: {
! 656: struct in_addr odst;
! 657:
! 658: odst = ip->ip_dst;
! 659: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
! 660: PFIL_IN) != 0)
! 661: return;
! 662: if (m == NULL)
! 663: return;
! 664: ip = mtod(m, struct ip *);
! 665: hlen = ip->ip_hl << 2;
! 666: /*
! 667: * XXX The setting of "srcrt" here is to prevent ip_forward()
! 668: * from generating ICMP redirects for packets that have
! 669: * been redirected by a hook back out on to the same LAN that
! 670: * they came from and is not an indication that the packet
! 671: * is being inffluenced by source routing options. This
! 672: * allows things like
! 673: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
! 674: * where tlp0 is both on the 1.1.1.0/24 network and is the
! 675: * default route for hosts on 1.1.1.0/24. Of course this
! 676: * also requires a "map tlp0 ..." to complete the story.
! 677: * One might argue whether or not this kind of network config.
! 678: * should be supported in this manner...
! 679: */
! 680: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
! 681: }
! 682: #endif /* PFIL_HOOKS */
! 683:
! 684: #ifdef ALTQ
! 685: /* XXX Temporary until ALTQ is changed to use a pfil hook */
! 686: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
! 687: /* packet dropped by traffic conditioner */
! 688: return;
! 689: }
! 690: #endif
! 691:
! 692: /*
! 693: * Process options and, if not destined for us,
! 694: * ship it on. ip_dooptions returns 1 when an
! 695: * error was detected (causing an icmp message
! 696: * to be sent and the original packet to be freed).
! 697: */
! 698: ip_nhops = 0; /* for source routed packets */
! 699: if (hlen > sizeof (struct ip) && ip_dooptions(m))
! 700: return;
! 701:
! 702: /*
! 703: * Enable a consistency check between the destination address
! 704: * and the arrival interface for a unicast packet (the RFC 1122
! 705: * strong ES model) if IP forwarding is disabled and the packet
! 706: * is not locally generated.
! 707: *
! 708: * XXX - Checking also should be disabled if the destination
! 709: * address is ipnat'ed to a different interface.
! 710: *
! 711: * XXX - Checking is incompatible with IP aliases added
! 712: * to the loopback interface instead of the interface where
! 713: * the packets are received.
! 714: *
! 715: * XXX - We need to add a per ifaddr flag for this so that
! 716: * we get finer grain control.
! 717: */
! 718: checkif = ip_checkinterface && (ipforwarding == 0) &&
! 719: (m->m_pkthdr.rcvif != NULL) &&
! 720: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
! 721:
! 722: /*
! 723: * Check our list of addresses, to see if the packet is for us.
! 724: *
! 725: * Traditional 4.4BSD did not consult IFF_UP at all.
! 726: * The behavior here is to treat addresses on !IFF_UP interface
! 727: * as not mine.
! 728: */
! 729: downmatch = 0;
! 730: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
! 731: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
! 732: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
! 733: continue;
! 734: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
! 735: break;
! 736: else
! 737: downmatch++;
! 738: }
! 739: }
! 740: if (ia != NULL)
! 741: goto ours;
! 742: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
! 743: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
! 744: if (ifa->ifa_addr->sa_family != AF_INET)
! 745: continue;
! 746: ia = ifatoia(ifa);
! 747: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
! 748: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
! 749: /*
! 750: * Look for all-0's host part (old broadcast addr),
! 751: * either for subnet or net.
! 752: */
! 753: ip->ip_dst.s_addr == ia->ia_subnet ||
! 754: ip->ip_dst.s_addr == ia->ia_net)
! 755: goto ours;
! 756: /*
! 757: * An interface with IP address zero accepts
! 758: * all packets that arrive on that interface.
! 759: */
! 760: if (in_nullhost(ia->ia_addr.sin_addr))
! 761: goto ours;
! 762: }
! 763: }
! 764: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
! 765: struct in_multi *inm;
! 766: #ifdef MROUTING
! 767: extern struct socket *ip_mrouter;
! 768:
! 769: if (ip_mrouter) {
! 770: /*
! 771: * If we are acting as a multicast router, all
! 772: * incoming multicast packets are passed to the
! 773: * kernel-level multicast forwarding function.
! 774: * The packet is returned (relatively) intact; if
! 775: * ip_mforward() returns a non-zero value, the packet
! 776: * must be discarded, else it may be accepted below.
! 777: *
! 778: * (The IP ident field is put in the same byte order
! 779: * as expected when ip_mforward() is called from
! 780: * ip_output().)
! 781: */
! 782: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
! 783: ipstat.ips_cantforward++;
! 784: m_freem(m);
! 785: return;
! 786: }
! 787:
! 788: /*
! 789: * The process-level routing demon needs to receive
! 790: * all multicast IGMP packets, whether or not this
! 791: * host belongs to their destination groups.
! 792: */
! 793: if (ip->ip_p == IPPROTO_IGMP)
! 794: goto ours;
! 795: ipstat.ips_forward++;
! 796: }
! 797: #endif
! 798: /*
! 799: * See if we belong to the destination multicast group on the
! 800: * arrival interface.
! 801: */
! 802: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
! 803: if (inm == NULL) {
! 804: ipstat.ips_cantforward++;
! 805: m_freem(m);
! 806: return;
! 807: }
! 808: goto ours;
! 809: }
! 810: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
! 811: in_nullhost(ip->ip_dst))
! 812: goto ours;
! 813:
! 814: /*
! 815: * Not for us; forward if possible and desirable.
! 816: */
! 817: if (ipforwarding == 0) {
! 818: ipstat.ips_cantforward++;
! 819: m_freem(m);
! 820: } else {
! 821: /*
! 822: * If ip_dst matched any of my address on !IFF_UP interface,
! 823: * and there's no IFF_UP interface that matches ip_dst,
! 824: * send icmp unreach. Forwarding it will result in in-kernel
! 825: * forwarding loop till TTL goes to 0.
! 826: */
! 827: if (downmatch) {
! 828: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
! 829: ipstat.ips_cantforward++;
! 830: return;
! 831: }
! 832: #ifdef IPSEC
! 833: if (ipsec4_in_reject(m, NULL)) {
! 834: ipsecstat.in_polvio++;
! 835: goto bad;
! 836: }
! 837: #endif
! 838: #ifdef FAST_IPSEC
! 839: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
! 840: s = splsoftnet();
! 841: if (mtag != NULL) {
! 842: tdbi = (struct tdb_ident *)(mtag + 1);
! 843: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
! 844: } else {
! 845: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
! 846: IP_FORWARDING, &error);
! 847: }
! 848: if (sp == NULL) { /* NB: can happen if error */
! 849: splx(s);
! 850: /*XXX error stat???*/
! 851: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
! 852: goto bad;
! 853: }
! 854:
! 855: /*
! 856: * Check security policy against packet attributes.
! 857: */
! 858: error = ipsec_in_reject(sp, m);
! 859: KEY_FREESP(&sp);
! 860: splx(s);
! 861: if (error) {
! 862: ipstat.ips_cantforward++;
! 863: goto bad;
! 864: }
! 865:
! 866: /*
! 867: * Peek at the outbound SP for this packet to determine if
! 868: * it's a Fast Forward candidate.
! 869: */
! 870: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
! 871: if (mtag != NULL)
! 872: m->m_flags &= ~M_CANFASTFWD;
! 873: else {
! 874: s = splsoftnet();
! 875: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
! 876: (IP_FORWARDING |
! 877: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
! 878: &error, NULL);
! 879: if (sp != NULL) {
! 880: m->m_flags &= ~M_CANFASTFWD;
! 881: KEY_FREESP(&sp);
! 882: }
! 883: splx(s);
! 884: }
! 885: #endif /* FAST_IPSEC */
! 886:
! 887: ip_forward(m, srcrt);
! 888: }
! 889: return;
! 890:
! 891: ours:
! 892: /*
! 893: * If offset or IP_MF are set, must reassemble.
! 894: * Otherwise, nothing need be done.
! 895: * (We could look in the reassembly queue to see
! 896: * if the packet was previously fragmented,
! 897: * but it's not worth the time; just let them time out.)
! 898: */
! 899: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
! 900:
! 901: /*
! 902: * Look for queue of fragments
! 903: * of this datagram.
! 904: */
! 905: IPQ_LOCK();
! 906: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
! 907: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
! 908: if (ip->ip_id == fp->ipq_id &&
! 909: in_hosteq(ip->ip_src, fp->ipq_src) &&
! 910: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
! 911: ip->ip_p == fp->ipq_p)
! 912: goto found;
! 913:
! 914: }
! 915: fp = 0;
! 916: found:
! 917:
! 918: /*
! 919: * Adjust ip_len to not reflect header,
! 920: * set ipqe_mff if more fragments are expected,
! 921: * convert offset of this to bytes.
! 922: */
! 923: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
! 924: mff = (ip->ip_off & htons(IP_MF)) != 0;
! 925: if (mff) {
! 926: /*
! 927: * Make sure that fragments have a data length
! 928: * that's a non-zero multiple of 8 bytes.
! 929: */
! 930: if (ntohs(ip->ip_len) == 0 ||
! 931: (ntohs(ip->ip_len) & 0x7) != 0) {
! 932: ipstat.ips_badfrags++;
! 933: IPQ_UNLOCK();
! 934: goto bad;
! 935: }
! 936: }
! 937: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
! 938:
! 939: /*
! 940: * If datagram marked as having more fragments
! 941: * or if this is not the first fragment,
! 942: * attempt reassembly; if it succeeds, proceed.
! 943: */
! 944: if (mff || ip->ip_off != htons(0)) {
! 945: ipstat.ips_fragments++;
! 946: s = splvm();
! 947: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
! 948: splx(s);
! 949: if (ipqe == NULL) {
! 950: ipstat.ips_rcvmemdrop++;
! 951: IPQ_UNLOCK();
! 952: goto bad;
! 953: }
! 954: ipqe->ipqe_mff = mff;
! 955: ipqe->ipqe_m = m;
! 956: ipqe->ipqe_ip = ip;
! 957: m = ip_reass(ipqe, fp, &ipq[hash]);
! 958: if (m == 0) {
! 959: IPQ_UNLOCK();
! 960: return;
! 961: }
! 962: ipstat.ips_reassembled++;
! 963: ip = mtod(m, struct ip *);
! 964: hlen = ip->ip_hl << 2;
! 965: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
! 966: } else
! 967: if (fp)
! 968: ip_freef(fp);
! 969: IPQ_UNLOCK();
! 970: }
! 971:
! 972: #if defined(IPSEC)
! 973: /*
! 974: * enforce IPsec policy checking if we are seeing last header.
! 975: * note that we do not visit this with protocols with pcb layer
! 976: * code - like udp/tcp/raw ip.
! 977: */
! 978: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
! 979: ipsec4_in_reject(m, NULL)) {
! 980: ipsecstat.in_polvio++;
! 981: goto bad;
! 982: }
! 983: #endif
! 984: #ifdef FAST_IPSEC
! 985: /*
! 986: * enforce IPsec policy checking if we are seeing last header.
! 987: * note that we do not visit this with protocols with pcb layer
! 988: * code - like udp/tcp/raw ip.
! 989: */
! 990: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
! 991: /*
! 992: * Check if the packet has already had IPsec processing
! 993: * done. If so, then just pass it along. This tag gets
! 994: * set during AH, ESP, etc. input handling, before the
! 995: * packet is returned to the ip input queue for delivery.
! 996: */
! 997: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
! 998: s = splsoftnet();
! 999: if (mtag != NULL) {
! 1000: tdbi = (struct tdb_ident *)(mtag + 1);
! 1001: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
! 1002: } else {
! 1003: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
! 1004: IP_FORWARDING, &error);
! 1005: }
! 1006: if (sp != NULL) {
! 1007: /*
! 1008: * Check security policy against packet attributes.
! 1009: */
! 1010: error = ipsec_in_reject(sp, m);
! 1011: KEY_FREESP(&sp);
! 1012: } else {
! 1013: /* XXX error stat??? */
! 1014: error = EINVAL;
! 1015: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
! 1016: goto bad;
! 1017: }
! 1018: splx(s);
! 1019: if (error)
! 1020: goto bad;
! 1021: }
! 1022: #endif /* FAST_IPSEC */
! 1023:
! 1024: /*
! 1025: * Switch out to protocol's input routine.
! 1026: */
! 1027: #if IFA_STATS
! 1028: if (ia && ip)
! 1029: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
! 1030: #endif
! 1031: ipstat.ips_delivered++;
! 1032: {
! 1033: int off = hlen, nh = ip->ip_p;
! 1034:
! 1035: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
! 1036: return;
! 1037: }
! 1038: bad:
! 1039: m_freem(m);
! 1040: return;
! 1041:
! 1042: badcsum:
! 1043: ipstat.ips_badsum++;
! 1044: m_freem(m);
! 1045: }
! 1046:
! 1047: /*
! 1048: * Take incoming datagram fragment and try to
! 1049: * reassemble it into whole datagram. If a chain for
! 1050: * reassembly of this datagram already exists, then it
! 1051: * is given as fp; otherwise have to make a chain.
! 1052: */
! 1053: struct mbuf *
! 1054: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
! 1055: {
! 1056: struct mbuf *m = ipqe->ipqe_m;
! 1057: struct ipqent *nq, *p, *q;
! 1058: struct ip *ip;
! 1059: struct mbuf *t;
! 1060: int hlen = ipqe->ipqe_ip->ip_hl << 2;
! 1061: int i, next, s;
! 1062:
! 1063: IPQ_LOCK_CHECK();
! 1064:
! 1065: /*
! 1066: * Presence of header sizes in mbufs
! 1067: * would confuse code below.
! 1068: */
! 1069: m->m_data += hlen;
! 1070: m->m_len -= hlen;
! 1071:
! 1072: #ifdef notyet
! 1073: /* make sure fragment limit is up-to-date */
! 1074: CHECK_NMBCLUSTER_PARAMS();
! 1075:
! 1076: /* If we have too many fragments, drop the older half. */
! 1077: if (ip_nfrags >= ip_maxfrags)
! 1078: ip_reass_drophalf(void);
! 1079: #endif
! 1080:
! 1081: /*
! 1082: * We are about to add a fragment; increment frag count.
! 1083: */
! 1084: ip_nfrags++;
! 1085:
! 1086: /*
! 1087: * If first fragment to arrive, create a reassembly queue.
! 1088: */
! 1089: if (fp == 0) {
! 1090: /*
! 1091: * Enforce upper bound on number of fragmented packets
! 1092: * for which we attempt reassembly;
! 1093: * If maxfrag is 0, never accept fragments.
! 1094: * If maxfrag is -1, accept all fragments without limitation.
! 1095: */
! 1096: if (ip_maxfragpackets < 0)
! 1097: ;
! 1098: else if (ip_nfragpackets >= ip_maxfragpackets)
! 1099: goto dropfrag;
! 1100: ip_nfragpackets++;
! 1101: MALLOC(fp, struct ipq *, sizeof (struct ipq),
! 1102: M_FTABLE, M_NOWAIT);
! 1103: if (fp == NULL)
! 1104: goto dropfrag;
! 1105: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
! 1106: fp->ipq_nfrags = 1;
! 1107: fp->ipq_ttl = IPFRAGTTL;
! 1108: fp->ipq_p = ipqe->ipqe_ip->ip_p;
! 1109: fp->ipq_id = ipqe->ipqe_ip->ip_id;
! 1110: TAILQ_INIT(&fp->ipq_fragq);
! 1111: fp->ipq_src = ipqe->ipqe_ip->ip_src;
! 1112: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
! 1113: p = NULL;
! 1114: goto insert;
! 1115: } else {
! 1116: fp->ipq_nfrags++;
! 1117: }
! 1118:
! 1119: /*
! 1120: * Find a segment which begins after this one does.
! 1121: */
! 1122: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
! 1123: p = q, q = TAILQ_NEXT(q, ipqe_q))
! 1124: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
! 1125: break;
! 1126:
! 1127: /*
! 1128: * If there is a preceding segment, it may provide some of
! 1129: * our data already. If so, drop the data from the incoming
! 1130: * segment. If it provides all of our data, drop us.
! 1131: */
! 1132: if (p != NULL) {
! 1133: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
! 1134: ntohs(ipqe->ipqe_ip->ip_off);
! 1135: if (i > 0) {
! 1136: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
! 1137: goto dropfrag;
! 1138: m_adj(ipqe->ipqe_m, i);
! 1139: ipqe->ipqe_ip->ip_off =
! 1140: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
! 1141: ipqe->ipqe_ip->ip_len =
! 1142: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
! 1143: }
! 1144: }
! 1145:
! 1146: /*
! 1147: * While we overlap succeeding segments trim them or,
! 1148: * if they are completely covered, dequeue them.
! 1149: */
! 1150: for (; q != NULL &&
! 1151: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
! 1152: ntohs(q->ipqe_ip->ip_off); q = nq) {
! 1153: i = (ntohs(ipqe->ipqe_ip->ip_off) +
! 1154: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
! 1155: if (i < ntohs(q->ipqe_ip->ip_len)) {
! 1156: q->ipqe_ip->ip_len =
! 1157: htons(ntohs(q->ipqe_ip->ip_len) - i);
! 1158: q->ipqe_ip->ip_off =
! 1159: htons(ntohs(q->ipqe_ip->ip_off) + i);
! 1160: m_adj(q->ipqe_m, i);
! 1161: break;
! 1162: }
! 1163: nq = TAILQ_NEXT(q, ipqe_q);
! 1164: m_freem(q->ipqe_m);
! 1165: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
! 1166: s = splvm();
! 1167: pool_put(&ipqent_pool, q);
! 1168: splx(s);
! 1169: fp->ipq_nfrags--;
! 1170: ip_nfrags--;
! 1171: }
! 1172:
! 1173: insert:
! 1174: /*
! 1175: * Stick new segment in its place;
! 1176: * check for complete reassembly.
! 1177: */
! 1178: if (p == NULL) {
! 1179: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
! 1180: } else {
! 1181: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
! 1182: }
! 1183: next = 0;
! 1184: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
! 1185: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
! 1186: if (ntohs(q->ipqe_ip->ip_off) != next)
! 1187: return (0);
! 1188: next += ntohs(q->ipqe_ip->ip_len);
! 1189: }
! 1190: if (p->ipqe_mff)
! 1191: return (0);
! 1192:
! 1193: /*
! 1194: * Reassembly is complete. Check for a bogus message size and
! 1195: * concatenate fragments.
! 1196: */
! 1197: q = TAILQ_FIRST(&fp->ipq_fragq);
! 1198: ip = q->ipqe_ip;
! 1199: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
! 1200: ipstat.ips_toolong++;
! 1201: ip_freef(fp);
! 1202: return (0);
! 1203: }
! 1204: m = q->ipqe_m;
! 1205: t = m->m_next;
! 1206: m->m_next = 0;
! 1207: m_cat(m, t);
! 1208: nq = TAILQ_NEXT(q, ipqe_q);
! 1209: s = splvm();
! 1210: pool_put(&ipqent_pool, q);
! 1211: splx(s);
! 1212: for (q = nq; q != NULL; q = nq) {
! 1213: t = q->ipqe_m;
! 1214: nq = TAILQ_NEXT(q, ipqe_q);
! 1215: s = splvm();
! 1216: pool_put(&ipqent_pool, q);
! 1217: splx(s);
! 1218: m_cat(m, t);
! 1219: }
! 1220: ip_nfrags -= fp->ipq_nfrags;
! 1221:
! 1222: /*
! 1223: * Create header for new ip packet by
! 1224: * modifying header of first packet;
! 1225: * dequeue and discard fragment reassembly header.
! 1226: * Make header visible.
! 1227: */
! 1228: ip->ip_len = htons(next);
! 1229: ip->ip_src = fp->ipq_src;
! 1230: ip->ip_dst = fp->ipq_dst;
! 1231: LIST_REMOVE(fp, ipq_q);
! 1232: FREE(fp, M_FTABLE);
! 1233: ip_nfragpackets--;
! 1234: m->m_len += (ip->ip_hl << 2);
! 1235: m->m_data -= (ip->ip_hl << 2);
! 1236: /* some debugging cruft by sklower, below, will go away soon */
! 1237: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
! 1238: int plen = 0;
! 1239: for (t = m; t; t = t->m_next)
! 1240: plen += t->m_len;
! 1241: m->m_pkthdr.len = plen;
! 1242: m->m_pkthdr.csum_flags = 0;
! 1243: }
! 1244: return (m);
! 1245:
! 1246: dropfrag:
! 1247: if (fp != 0)
! 1248: fp->ipq_nfrags--;
! 1249: ip_nfrags--;
! 1250: ipstat.ips_fragdropped++;
! 1251: m_freem(m);
! 1252: s = splvm();
! 1253: pool_put(&ipqent_pool, ipqe);
! 1254: splx(s);
! 1255: return (0);
! 1256: }
! 1257:
! 1258: /*
! 1259: * Free a fragment reassembly header and all
! 1260: * associated datagrams.
! 1261: */
! 1262: void
! 1263: ip_freef(struct ipq *fp)
! 1264: {
! 1265: struct ipqent *q, *p;
! 1266: u_int nfrags = 0;
! 1267: int s;
! 1268:
! 1269: IPQ_LOCK_CHECK();
! 1270:
! 1271: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
! 1272: p = TAILQ_NEXT(q, ipqe_q);
! 1273: m_freem(q->ipqe_m);
! 1274: nfrags++;
! 1275: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
! 1276: s = splvm();
! 1277: pool_put(&ipqent_pool, q);
! 1278: splx(s);
! 1279: }
! 1280:
! 1281: if (nfrags != fp->ipq_nfrags)
! 1282: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
! 1283: ip_nfrags -= nfrags;
! 1284: LIST_REMOVE(fp, ipq_q);
! 1285: FREE(fp, M_FTABLE);
! 1286: ip_nfragpackets--;
! 1287: }
! 1288:
! 1289: /*
! 1290: * IP reassembly TTL machinery for multiplicative drop.
! 1291: */
! 1292: static u_int fragttl_histo[(IPFRAGTTL+1)];
! 1293:
! 1294:
! 1295: /*
! 1296: * Decrement TTL of all reasembly queue entries by `ticks'.
! 1297: * Count number of distinct fragments (as opposed to partial, fragmented
! 1298: * datagrams) in the reassembly queue. While we traverse the entire
! 1299: * reassembly queue, compute and return the median TTL over all fragments.
! 1300: */
! 1301: static u_int
! 1302: ip_reass_ttl_decr(u_int ticks)
! 1303: {
! 1304: u_int nfrags, median, dropfraction, keepfraction;
! 1305: struct ipq *fp, *nfp;
! 1306: int i;
! 1307:
! 1308: nfrags = 0;
! 1309: memset(fragttl_histo, 0, sizeof fragttl_histo);
! 1310:
! 1311: for (i = 0; i < IPREASS_NHASH; i++) {
! 1312: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
! 1313: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
! 1314: 0 : fp->ipq_ttl - ticks);
! 1315: nfp = LIST_NEXT(fp, ipq_q);
! 1316: if (fp->ipq_ttl == 0) {
! 1317: ipstat.ips_fragtimeout++;
! 1318: ip_freef(fp);
! 1319: } else {
! 1320: nfrags += fp->ipq_nfrags;
! 1321: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
! 1322: }
! 1323: }
! 1324: }
! 1325:
! 1326: KASSERT(ip_nfrags == nfrags);
! 1327:
! 1328: /* Find median (or other drop fraction) in histogram. */
! 1329: dropfraction = (ip_nfrags / 2);
! 1330: keepfraction = ip_nfrags - dropfraction;
! 1331: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
! 1332: median += fragttl_histo[i];
! 1333: if (median >= keepfraction)
! 1334: break;
! 1335: }
! 1336:
! 1337: /* Return TTL of median (or other fraction). */
! 1338: return (u_int)i;
! 1339: }
! 1340:
! 1341: void
! 1342: ip_reass_drophalf(void)
! 1343: {
! 1344:
! 1345: u_int median_ticks;
! 1346: /*
! 1347: * Compute median TTL of all fragments, and count frags
! 1348: * with that TTL or lower (roughly half of all fragments).
! 1349: */
! 1350: median_ticks = ip_reass_ttl_decr(0);
! 1351:
! 1352: /* Drop half. */
! 1353: median_ticks = ip_reass_ttl_decr(median_ticks);
! 1354:
! 1355: }
! 1356:
! 1357: /*
! 1358: * IP timer processing;
! 1359: * if a timer expires on a reassembly
! 1360: * queue, discard it.
! 1361: */
! 1362: void
! 1363: ip_slowtimo(void)
! 1364: {
! 1365: static u_int dropscanidx = 0;
! 1366: u_int i;
! 1367: u_int median_ttl;
! 1368: int s = splsoftnet();
! 1369:
! 1370: IPQ_LOCK();
! 1371:
! 1372: /* Age TTL of all fragments by 1 tick .*/
! 1373: median_ttl = ip_reass_ttl_decr(1);
! 1374:
! 1375: /* make sure fragment limit is up-to-date */
! 1376: CHECK_NMBCLUSTER_PARAMS();
! 1377:
! 1378: /* If we have too many fragments, drop the older half. */
! 1379: if (ip_nfrags > ip_maxfrags)
! 1380: ip_reass_ttl_decr(median_ttl);
! 1381:
! 1382: /*
! 1383: * If we are over the maximum number of fragmented packets
! 1384: * (due to the limit being lowered), drain off
! 1385: * enough to get down to the new limit. Start draining
! 1386: * from the reassembly hashqueue most recently drained.
! 1387: */
! 1388: if (ip_maxfragpackets < 0)
! 1389: ;
! 1390: else {
! 1391: int wrapped = 0;
! 1392:
! 1393: i = dropscanidx;
! 1394: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
! 1395: while (LIST_FIRST(&ipq[i]) != NULL)
! 1396: ip_freef(LIST_FIRST(&ipq[i]));
! 1397: if (++i >= IPREASS_NHASH) {
! 1398: i = 0;
! 1399: }
! 1400: /*
! 1401: * Dont scan forever even if fragment counters are
! 1402: * wrong: stop after scanning entire reassembly queue.
! 1403: */
! 1404: if (i == dropscanidx)
! 1405: wrapped = 1;
! 1406: }
! 1407: dropscanidx = i;
! 1408: }
! 1409: IPQ_UNLOCK();
! 1410: splx(s);
! 1411: }
! 1412:
! 1413: /*
! 1414: * Drain off all datagram fragments.
! 1415: */
! 1416: void
! 1417: ip_drain(void)
! 1418: {
! 1419:
! 1420: /*
! 1421: * We may be called from a device's interrupt context. If
! 1422: * the ipq is already busy, just bail out now.
! 1423: */
! 1424: if (ipq_lock_try() == 0)
! 1425: return;
! 1426:
! 1427: /*
! 1428: * Drop half the total fragments now. If more mbufs are needed,
! 1429: * we will be called again soon.
! 1430: */
! 1431: ip_reass_drophalf();
! 1432:
! 1433: IPQ_UNLOCK();
! 1434: }
! 1435:
! 1436: /*
! 1437: * Do option processing on a datagram,
! 1438: * possibly discarding it if bad options are encountered,
! 1439: * or forwarding it if source-routed.
! 1440: * Returns 1 if packet has been forwarded/freed,
! 1441: * 0 if the packet should be processed further.
! 1442: */
! 1443: int
! 1444: ip_dooptions(struct mbuf *m)
! 1445: {
! 1446: struct ip *ip = mtod(m, struct ip *);
! 1447: u_char *cp, *cp0;
! 1448: struct ip_timestamp *ipt;
! 1449: struct in_ifaddr *ia;
! 1450: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
! 1451: struct in_addr dst;
! 1452: n_time ntime;
! 1453:
! 1454: dst = ip->ip_dst;
! 1455: cp = (u_char *)(ip + 1);
! 1456: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
! 1457: for (; cnt > 0; cnt -= optlen, cp += optlen) {
! 1458: opt = cp[IPOPT_OPTVAL];
! 1459: if (opt == IPOPT_EOL)
! 1460: break;
! 1461: if (opt == IPOPT_NOP)
! 1462: optlen = 1;
! 1463: else {
! 1464: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
! 1465: code = &cp[IPOPT_OLEN] - (u_char *)ip;
! 1466: goto bad;
! 1467: }
! 1468: optlen = cp[IPOPT_OLEN];
! 1469: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
! 1470: code = &cp[IPOPT_OLEN] - (u_char *)ip;
! 1471: goto bad;
! 1472: }
! 1473: }
! 1474: switch (opt) {
! 1475:
! 1476: default:
! 1477: break;
! 1478:
! 1479: /*
! 1480: * Source routing with record.
! 1481: * Find interface with current destination address.
! 1482: * If none on this machine then drop if strictly routed,
! 1483: * or do nothing if loosely routed.
! 1484: * Record interface address and bring up next address
! 1485: * component. If strictly routed make sure next
! 1486: * address is on directly accessible net.
! 1487: */
! 1488: case IPOPT_LSRR:
! 1489: case IPOPT_SSRR:
! 1490: if (ip_allowsrcrt == 0) {
! 1491: type = ICMP_UNREACH;
! 1492: code = ICMP_UNREACH_NET_PROHIB;
! 1493: goto bad;
! 1494: }
! 1495: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
! 1496: code = &cp[IPOPT_OLEN] - (u_char *)ip;
! 1497: goto bad;
! 1498: }
! 1499: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
! 1500: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
! 1501: goto bad;
! 1502: }
! 1503: ipaddr.sin_addr = ip->ip_dst;
! 1504: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
! 1505: if (ia == 0) {
! 1506: if (opt == IPOPT_SSRR) {
! 1507: type = ICMP_UNREACH;
! 1508: code = ICMP_UNREACH_SRCFAIL;
! 1509: goto bad;
! 1510: }
! 1511: /*
! 1512: * Loose routing, and not at next destination
! 1513: * yet; nothing to do except forward.
! 1514: */
! 1515: break;
! 1516: }
! 1517: off--; /* 0 origin */
! 1518: if ((off + sizeof(struct in_addr)) > optlen) {
! 1519: /*
! 1520: * End of source route. Should be for us.
! 1521: */
! 1522: save_rte(cp, ip->ip_src);
! 1523: break;
! 1524: }
! 1525: /*
! 1526: * locate outgoing interface
! 1527: */
! 1528: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
! 1529: sizeof(ipaddr.sin_addr));
! 1530: if (opt == IPOPT_SSRR)
! 1531: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
! 1532: else
! 1533: ia = ip_rtaddr(ipaddr.sin_addr);
! 1534: if (ia == 0) {
! 1535: type = ICMP_UNREACH;
! 1536: code = ICMP_UNREACH_SRCFAIL;
! 1537: goto bad;
! 1538: }
! 1539: ip->ip_dst = ipaddr.sin_addr;
! 1540: bcopy((void *)&ia->ia_addr.sin_addr,
! 1541: (void *)(cp + off), sizeof(struct in_addr));
! 1542: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
! 1543: /*
! 1544: * Let ip_intr's mcast routing check handle mcast pkts
! 1545: */
! 1546: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
! 1547: break;
! 1548:
! 1549: case IPOPT_RR:
! 1550: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
! 1551: code = &cp[IPOPT_OLEN] - (u_char *)ip;
! 1552: goto bad;
! 1553: }
! 1554: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
! 1555: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
! 1556: goto bad;
! 1557: }
! 1558: /*
! 1559: * If no space remains, ignore.
! 1560: */
! 1561: off--; /* 0 origin */
! 1562: if ((off + sizeof(struct in_addr)) > optlen)
! 1563: break;
! 1564: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
! 1565: sizeof(ipaddr.sin_addr));
! 1566: /*
! 1567: * locate outgoing interface; if we're the destination,
! 1568: * use the incoming interface (should be same).
! 1569: */
! 1570: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
! 1571: == NULL &&
! 1572: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
! 1573: type = ICMP_UNREACH;
! 1574: code = ICMP_UNREACH_HOST;
! 1575: goto bad;
! 1576: }
! 1577: bcopy((void *)&ia->ia_addr.sin_addr,
! 1578: (void *)(cp + off), sizeof(struct in_addr));
! 1579: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
! 1580: break;
! 1581:
! 1582: case IPOPT_TS:
! 1583: code = cp - (u_char *)ip;
! 1584: ipt = (struct ip_timestamp *)cp;
! 1585: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
! 1586: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
! 1587: goto bad;
! 1588: }
! 1589: if (ipt->ipt_ptr < 5) {
! 1590: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
! 1591: goto bad;
! 1592: }
! 1593: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
! 1594: if (++ipt->ipt_oflw == 0) {
! 1595: code = (u_char *)&ipt->ipt_ptr -
! 1596: (u_char *)ip;
! 1597: goto bad;
! 1598: }
! 1599: break;
! 1600: }
! 1601: cp0 = (cp + ipt->ipt_ptr - 1);
! 1602: switch (ipt->ipt_flg) {
! 1603:
! 1604: case IPOPT_TS_TSONLY:
! 1605: break;
! 1606:
! 1607: case IPOPT_TS_TSANDADDR:
! 1608: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
! 1609: sizeof(struct in_addr) > ipt->ipt_len) {
! 1610: code = (u_char *)&ipt->ipt_ptr -
! 1611: (u_char *)ip;
! 1612: goto bad;
! 1613: }
! 1614: ipaddr.sin_addr = dst;
! 1615: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
! 1616: m->m_pkthdr.rcvif));
! 1617: if (ia == 0)
! 1618: continue;
! 1619: bcopy(&ia->ia_addr.sin_addr,
! 1620: cp0, sizeof(struct in_addr));
! 1621: ipt->ipt_ptr += sizeof(struct in_addr);
! 1622: break;
! 1623:
! 1624: case IPOPT_TS_PRESPEC:
! 1625: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
! 1626: sizeof(struct in_addr) > ipt->ipt_len) {
! 1627: code = (u_char *)&ipt->ipt_ptr -
! 1628: (u_char *)ip;
! 1629: goto bad;
! 1630: }
! 1631: bcopy(cp0, &ipaddr.sin_addr,
! 1632: sizeof(struct in_addr));
! 1633: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
! 1634: == NULL)
! 1635: continue;
! 1636: ipt->ipt_ptr += sizeof(struct in_addr);
! 1637: break;
! 1638:
! 1639: default:
! 1640: /* XXX can't take &ipt->ipt_flg */
! 1641: code = (u_char *)&ipt->ipt_ptr -
! 1642: (u_char *)ip + 1;
! 1643: goto bad;
! 1644: }
! 1645: ntime = iptime();
! 1646: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
! 1647: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
! 1648: sizeof(n_time));
! 1649: ipt->ipt_ptr += sizeof(n_time);
! 1650: }
! 1651: }
! 1652: if (forward) {
! 1653: if (ip_forwsrcrt == 0) {
! 1654: type = ICMP_UNREACH;
! 1655: code = ICMP_UNREACH_SRCFAIL;
! 1656: goto bad;
! 1657: }
! 1658: ip_forward(m, 1);
! 1659: return (1);
! 1660: }
! 1661: return (0);
! 1662: bad:
! 1663: icmp_error(m, type, code, 0, 0);
! 1664: ipstat.ips_badoptions++;
! 1665: return (1);
! 1666: }
! 1667:
! 1668: /*
! 1669: * Given address of next destination (final or next hop),
! 1670: * return internet address info of interface to be used to get there.
! 1671: */
! 1672: struct in_ifaddr *
! 1673: ip_rtaddr(struct in_addr dst)
! 1674: {
! 1675: struct rtentry *rt;
! 1676: union {
! 1677: struct sockaddr dst;
! 1678: struct sockaddr_in dst4;
! 1679: } u;
! 1680:
! 1681: sockaddr_in_init(&u.dst4, &dst, 0);
! 1682:
! 1683: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
! 1684: return NULL;
! 1685:
! 1686: return ifatoia(rt->rt_ifa);
! 1687: }
! 1688:
! 1689: /*
! 1690: * Save incoming source route for use in replies,
! 1691: * to be picked up later by ip_srcroute if the receiver is interested.
! 1692: */
! 1693: void
! 1694: save_rte(u_char *option, struct in_addr dst)
! 1695: {
! 1696: unsigned olen;
! 1697:
! 1698: olen = option[IPOPT_OLEN];
! 1699: #ifdef DIAGNOSTIC
! 1700: if (ipprintfs)
! 1701: printf("save_rte: olen %d\n", olen);
! 1702: #endif /* 0 */
! 1703: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
! 1704: return;
! 1705: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
! 1706: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
! 1707: ip_srcrt.dst = dst;
! 1708: }
! 1709:
! 1710: /*
! 1711: * Retrieve incoming source route for use in replies,
! 1712: * in the same form used by setsockopt.
! 1713: * The first hop is placed before the options, will be removed later.
! 1714: */
! 1715: struct mbuf *
! 1716: ip_srcroute(void)
! 1717: {
! 1718: struct in_addr *p, *q;
! 1719: struct mbuf *m;
! 1720:
! 1721: if (ip_nhops == 0)
! 1722: return NULL;
! 1723: m = m_get(M_DONTWAIT, MT_SOOPTS);
! 1724: if (m == 0)
! 1725: return NULL;
! 1726:
! 1727: MCLAIM(m, &inetdomain.dom_mowner);
! 1728: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
! 1729:
! 1730: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
! 1731: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
! 1732: OPTSIZ;
! 1733: #ifdef DIAGNOSTIC
! 1734: if (ipprintfs)
! 1735: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
! 1736: #endif
! 1737:
! 1738: /*
! 1739: * First save first hop for return route
! 1740: */
! 1741: p = &ip_srcrt.route[ip_nhops - 1];
! 1742: *(mtod(m, struct in_addr *)) = *p--;
! 1743: #ifdef DIAGNOSTIC
! 1744: if (ipprintfs)
! 1745: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
! 1746: #endif
! 1747:
! 1748: /*
! 1749: * Copy option fields and padding (nop) to mbuf.
! 1750: */
! 1751: ip_srcrt.nop = IPOPT_NOP;
! 1752: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
! 1753: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
! 1754: OPTSIZ);
! 1755: q = (struct in_addr *)(mtod(m, char *) +
! 1756: sizeof(struct in_addr) + OPTSIZ);
! 1757: #undef OPTSIZ
! 1758: /*
! 1759: * Record return path as an IP source route,
! 1760: * reversing the path (pointers are now aligned).
! 1761: */
! 1762: while (p >= ip_srcrt.route) {
! 1763: #ifdef DIAGNOSTIC
! 1764: if (ipprintfs)
! 1765: printf(" %x", ntohl(q->s_addr));
! 1766: #endif
! 1767: *q++ = *p--;
! 1768: }
! 1769: /*
! 1770: * Last hop goes to final destination.
! 1771: */
! 1772: *q = ip_srcrt.dst;
! 1773: #ifdef DIAGNOSTIC
! 1774: if (ipprintfs)
! 1775: printf(" %x\n", ntohl(q->s_addr));
! 1776: #endif
! 1777: return (m);
! 1778: }
! 1779:
! 1780: /*
! 1781: * Strip out IP options, at higher
! 1782: * level protocol in the kernel.
! 1783: * Second argument is buffer to which options
! 1784: * will be moved, and return value is their length.
! 1785: * XXX should be deleted; last arg currently ignored.
! 1786: */
! 1787: void
! 1788: ip_stripoptions(struct mbuf *m, struct mbuf *mopt)
! 1789: {
! 1790: int i;
! 1791: struct ip *ip = mtod(m, struct ip *);
! 1792: void *opts;
! 1793: int olen;
! 1794:
! 1795: olen = (ip->ip_hl << 2) - sizeof (struct ip);
! 1796: opts = (void *)(ip + 1);
! 1797: i = m->m_len - (sizeof (struct ip) + olen);
! 1798: memmove(opts, (char *)opts + olen, (unsigned)i);
! 1799: m->m_len -= olen;
! 1800: if (m->m_flags & M_PKTHDR)
! 1801: m->m_pkthdr.len -= olen;
! 1802: ip->ip_len = htons(ntohs(ip->ip_len) - olen);
! 1803: ip->ip_hl = sizeof (struct ip) >> 2;
! 1804: }
! 1805:
! 1806: const int inetctlerrmap[PRC_NCMDS] = {
! 1807: 0, 0, 0, 0,
! 1808: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
! 1809: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
! 1810: EMSGSIZE, EHOSTUNREACH, 0, 0,
! 1811: 0, 0, 0, 0,
! 1812: ENOPROTOOPT
! 1813: };
! 1814:
! 1815: /*
! 1816: * Forward a packet. If some error occurs return the sender
! 1817: * an icmp packet. Note we can't always generate a meaningful
! 1818: * icmp message because icmp doesn't have a large enough repertoire
! 1819: * of codes and types.
! 1820: *
! 1821: * If not forwarding, just drop the packet. This could be confusing
! 1822: * if ipforwarding was zero but some routing protocol was advancing
! 1823: * us as a gateway to somewhere. However, we must let the routing
! 1824: * protocol deal with that.
! 1825: *
! 1826: * The srcrt parameter indicates whether the packet is being forwarded
! 1827: * via a source route.
! 1828: */
! 1829: void
! 1830: ip_forward(struct mbuf *m, int srcrt)
! 1831: {
! 1832: struct ip *ip = mtod(m, struct ip *);
! 1833: struct rtentry *rt;
! 1834: int error, type = 0, code = 0, destmtu = 0;
! 1835: struct mbuf *mcopy;
! 1836: n_long dest;
! 1837: union {
! 1838: struct sockaddr dst;
! 1839: struct sockaddr_in dst4;
! 1840: } u;
! 1841:
! 1842: /*
! 1843: * We are now in the output path.
! 1844: */
! 1845: MCLAIM(m, &ip_tx_mowner);
! 1846:
! 1847: /*
! 1848: * Clear any in-bound checksum flags for this packet.
! 1849: */
! 1850: m->m_pkthdr.csum_flags = 0;
! 1851:
! 1852: dest = 0;
! 1853: #ifdef DIAGNOSTIC
! 1854: if (ipprintfs) {
! 1855: printf("forward: src %s ", inet_ntoa(ip->ip_src));
! 1856: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
! 1857: }
! 1858: #endif
! 1859: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
! 1860: ipstat.ips_cantforward++;
! 1861: m_freem(m);
! 1862: return;
! 1863: }
! 1864: if (ip->ip_ttl <= IPTTLDEC) {
! 1865: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
! 1866: return;
! 1867: }
! 1868:
! 1869: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
! 1870: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
! 1871: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
! 1872: return;
! 1873: }
! 1874:
! 1875: /*
! 1876: * Save at most 68 bytes of the packet in case
! 1877: * we need to generate an ICMP message to the src.
! 1878: * Pullup to avoid sharing mbuf cluster between m and mcopy.
! 1879: */
! 1880: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
! 1881: if (mcopy)
! 1882: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
! 1883:
! 1884: ip->ip_ttl -= IPTTLDEC;
! 1885:
! 1886: /*
! 1887: * If forwarding packet using same interface that it came in on,
! 1888: * perhaps should send a redirect to sender to shortcut a hop.
! 1889: * Only send redirect if source is sending directly to us,
! 1890: * and if packet was not source routed (or has any options).
! 1891: * Also, don't send redirect if forwarding using a default route
! 1892: * or a route modified by a redirect.
! 1893: */
! 1894: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
! 1895: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
! 1896: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
! 1897: ipsendredirects && !srcrt) {
! 1898: if (rt->rt_ifa &&
! 1899: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
! 1900: ifatoia(rt->rt_ifa)->ia_subnet) {
! 1901: if (rt->rt_flags & RTF_GATEWAY)
! 1902: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
! 1903: else
! 1904: dest = ip->ip_dst.s_addr;
! 1905: /*
! 1906: * Router requirements says to only send host
! 1907: * redirects.
! 1908: */
! 1909: type = ICMP_REDIRECT;
! 1910: code = ICMP_REDIRECT_HOST;
! 1911: #ifdef DIAGNOSTIC
! 1912: if (ipprintfs)
! 1913: printf("redirect (%d) to %x\n", code,
! 1914: (u_int32_t)dest);
! 1915: #endif
! 1916: }
! 1917: }
! 1918:
! 1919: error = ip_output(m, NULL, &ipforward_rt,
! 1920: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
! 1921: (struct ip_moptions *)NULL, (struct socket *)NULL);
! 1922:
! 1923: if (error)
! 1924: ipstat.ips_cantforward++;
! 1925: else {
! 1926: ipstat.ips_forward++;
! 1927: if (type)
! 1928: ipstat.ips_redirectsent++;
! 1929: else {
! 1930: if (mcopy) {
! 1931: #ifdef GATEWAY
! 1932: if (mcopy->m_flags & M_CANFASTFWD)
! 1933: ipflow_create(&ipforward_rt, mcopy);
! 1934: #endif
! 1935: m_freem(mcopy);
! 1936: }
! 1937: return;
! 1938: }
! 1939: }
! 1940: if (mcopy == NULL)
! 1941: return;
! 1942:
! 1943: switch (error) {
! 1944:
! 1945: case 0: /* forwarded, but need redirect */
! 1946: /* type, code set above */
! 1947: break;
! 1948:
! 1949: case ENETUNREACH: /* shouldn't happen, checked above */
! 1950: case EHOSTUNREACH:
! 1951: case ENETDOWN:
! 1952: case EHOSTDOWN:
! 1953: default:
! 1954: type = ICMP_UNREACH;
! 1955: code = ICMP_UNREACH_HOST;
! 1956: break;
! 1957:
! 1958: case EMSGSIZE:
! 1959: type = ICMP_UNREACH;
! 1960: code = ICMP_UNREACH_NEEDFRAG;
! 1961: #if !defined(IPSEC) && !defined(FAST_IPSEC)
! 1962: if (ipforward_rt.ro_rt != NULL)
! 1963: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
! 1964: #else
! 1965: /*
! 1966: * If the packet is routed over IPsec tunnel, tell the
! 1967: * originator the tunnel MTU.
! 1968: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
! 1969: * XXX quickhack!!!
! 1970: */
! 1971: if (ipforward_rt.ro_rt != NULL) {
! 1972: struct secpolicy *sp;
! 1973: int ipsecerror;
! 1974: size_t ipsechdr;
! 1975: struct route *ro;
! 1976:
! 1977: sp = ipsec4_getpolicybyaddr(mcopy,
! 1978: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
! 1979: &ipsecerror);
! 1980:
! 1981: if (sp == NULL)
! 1982: destmtu = ipforward_rt.ro_rt->rt_ifp->if_mtu;
! 1983: else {
! 1984: /* count IPsec header size */
! 1985: ipsechdr = ipsec4_hdrsiz(mcopy,
! 1986: IPSEC_DIR_OUTBOUND, NULL);
! 1987:
! 1988: /*
! 1989: * find the correct route for outer IPv4
! 1990: * header, compute tunnel MTU.
! 1991: */
! 1992:
! 1993: if (sp->req != NULL
! 1994: && sp->req->sav != NULL
! 1995: && sp->req->sav->sah != NULL) {
! 1996: ro = &sp->req->sav->sah->sa_route;
! 1997: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
! 1998: destmtu =
! 1999: ro->ro_rt->rt_rmx.rmx_mtu ?
! 2000: ro->ro_rt->rt_rmx.rmx_mtu :
! 2001: ro->ro_rt->rt_ifp->if_mtu;
! 2002: destmtu -= ipsechdr;
! 2003: }
! 2004: }
! 2005:
! 2006: #ifdef IPSEC
! 2007: key_freesp(sp);
! 2008: #else
! 2009: KEY_FREESP(&sp);
! 2010: #endif
! 2011: }
! 2012: }
! 2013: #endif /*IPSEC*/
! 2014: ipstat.ips_cantfrag++;
! 2015: break;
! 2016:
! 2017: case ENOBUFS:
! 2018: #if 1
! 2019: /*
! 2020: * a router should not generate ICMP_SOURCEQUENCH as
! 2021: * required in RFC1812 Requirements for IP Version 4 Routers.
! 2022: * source quench could be a big problem under DoS attacks,
! 2023: * or if the underlying interface is rate-limited.
! 2024: */
! 2025: if (mcopy)
! 2026: m_freem(mcopy);
! 2027: return;
! 2028: #else
! 2029: type = ICMP_SOURCEQUENCH;
! 2030: code = 0;
! 2031: break;
! 2032: #endif
! 2033: }
! 2034: icmp_error(mcopy, type, code, dest, destmtu);
! 2035: }
! 2036:
! 2037: void
! 2038: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
! 2039: struct mbuf *m)
! 2040: {
! 2041:
! 2042: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
! 2043: struct timeval tv;
! 2044:
! 2045: microtime(&tv);
! 2046: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
! 2047: SCM_TIMESTAMP, SOL_SOCKET);
! 2048: if (*mp)
! 2049: mp = &(*mp)->m_next;
! 2050: }
! 2051: if (inp->inp_flags & INP_RECVDSTADDR) {
! 2052: *mp = sbcreatecontrol((void *) &ip->ip_dst,
! 2053: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
! 2054: if (*mp)
! 2055: mp = &(*mp)->m_next;
! 2056: }
! 2057: #ifdef notyet
! 2058: /*
! 2059: * XXX
! 2060: * Moving these out of udp_input() made them even more broken
! 2061: * than they already were.
! 2062: * - fenner@parc.xerox.com
! 2063: */
! 2064: /* options were tossed already */
! 2065: if (inp->inp_flags & INP_RECVOPTS) {
! 2066: *mp = sbcreatecontrol((void *) opts_deleted_above,
! 2067: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
! 2068: if (*mp)
! 2069: mp = &(*mp)->m_next;
! 2070: }
! 2071: /* ip_srcroute doesn't do what we want here, need to fix */
! 2072: if (inp->inp_flags & INP_RECVRETOPTS) {
! 2073: *mp = sbcreatecontrol((void *) ip_srcroute(),
! 2074: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
! 2075: if (*mp)
! 2076: mp = &(*mp)->m_next;
! 2077: }
! 2078: #endif
! 2079: if (inp->inp_flags & INP_RECVIF) {
! 2080: struct sockaddr_dl sdl;
! 2081:
! 2082: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
! 2083: sdl.sdl_family = AF_LINK;
! 2084: sdl.sdl_index = m->m_pkthdr.rcvif ?
! 2085: m->m_pkthdr.rcvif->if_index : 0;
! 2086: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
! 2087: *mp = sbcreatecontrol((void *) &sdl, sdl.sdl_len,
! 2088: IP_RECVIF, IPPROTO_IP);
! 2089: if (*mp)
! 2090: mp = &(*mp)->m_next;
! 2091: }
! 2092: }
! 2093:
! 2094: /*
! 2095: * sysctl helper routine for net.inet.ip.forwsrcrt.
! 2096: */
! 2097: static int
! 2098: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
! 2099: {
! 2100: int error, tmp;
! 2101: struct sysctlnode node;
! 2102:
! 2103: node = *rnode;
! 2104: tmp = ip_forwsrcrt;
! 2105: node.sysctl_data = &tmp;
! 2106: error = sysctl_lookup(SYSCTLFN_CALL(&node));
! 2107: if (error || newp == NULL)
! 2108: return (error);
! 2109:
! 2110: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
! 2111: 0, NULL, NULL, NULL))
! 2112: return (EPERM);
! 2113:
! 2114: ip_forwsrcrt = tmp;
! 2115:
! 2116: return (0);
! 2117: }
! 2118:
! 2119: /*
! 2120: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
! 2121: * range of the new value and tweaks timers if it changes.
! 2122: */
! 2123: static int
! 2124: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
! 2125: {
! 2126: int error, tmp;
! 2127: struct sysctlnode node;
! 2128:
! 2129: node = *rnode;
! 2130: tmp = ip_mtudisc_timeout;
! 2131: node.sysctl_data = &tmp;
! 2132: error = sysctl_lookup(SYSCTLFN_CALL(&node));
! 2133: if (error || newp == NULL)
! 2134: return (error);
! 2135: if (tmp < 0)
! 2136: return (EINVAL);
! 2137:
! 2138: ip_mtudisc_timeout = tmp;
! 2139: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
! 2140:
! 2141: return (0);
! 2142: }
! 2143:
! 2144: #ifdef GATEWAY
! 2145: /*
! 2146: * sysctl helper routine for net.inet.ip.maxflows.
! 2147: */
! 2148: static int
! 2149: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
! 2150: {
! 2151: int s;
! 2152:
! 2153: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
! 2154: if (s || newp == NULL)
! 2155: return (s);
! 2156:
! 2157: s = splsoftnet();
! 2158: ipflow_reap(0);
! 2159: splx(s);
! 2160:
! 2161: return (0);
! 2162: }
! 2163:
! 2164: static int
! 2165: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
! 2166: {
! 2167: int error, tmp;
! 2168: struct sysctlnode node;
! 2169:
! 2170: node = *rnode;
! 2171: tmp = ip_hashsize;
! 2172: node.sysctl_data = &tmp;
! 2173: error = sysctl_lookup(SYSCTLFN_CALL(&node));
! 2174: if (error || newp == NULL)
! 2175: return (error);
! 2176:
! 2177: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
! 2178: /*
! 2179: * Can only fail due to malloc()
! 2180: */
! 2181: if (ipflow_invalidate_all(tmp))
! 2182: return ENOMEM;
! 2183: } else {
! 2184: /*
! 2185: * EINVAL if not a power of 2
! 2186: */
! 2187: return EINVAL;
! 2188: }
! 2189:
! 2190: return (0);
! 2191: }
! 2192: #endif /* GATEWAY */
! 2193:
! 2194:
! 2195: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
! 2196: {
! 2197: extern int subnetsarelocal, hostzeroisbroadcast;
! 2198:
! 2199: sysctl_createv(clog, 0, NULL, NULL,
! 2200: CTLFLAG_PERMANENT,
! 2201: CTLTYPE_NODE, "net", NULL,
! 2202: NULL, 0, NULL, 0,
! 2203: CTL_NET, CTL_EOL);
! 2204: sysctl_createv(clog, 0, NULL, NULL,
! 2205: CTLFLAG_PERMANENT,
! 2206: CTLTYPE_NODE, "inet",
! 2207: SYSCTL_DESCR("PF_INET related settings"),
! 2208: NULL, 0, NULL, 0,
! 2209: CTL_NET, PF_INET, CTL_EOL);
! 2210: sysctl_createv(clog, 0, NULL, NULL,
! 2211: CTLFLAG_PERMANENT,
! 2212: CTLTYPE_NODE, "ip",
! 2213: SYSCTL_DESCR("IPv4 related settings"),
! 2214: NULL, 0, NULL, 0,
! 2215: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
! 2216:
! 2217: sysctl_createv(clog, 0, NULL, NULL,
! 2218: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2219: CTLTYPE_INT, "forwarding",
! 2220: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
! 2221: NULL, 0, &ipforwarding, 0,
! 2222: CTL_NET, PF_INET, IPPROTO_IP,
! 2223: IPCTL_FORWARDING, CTL_EOL);
! 2224: sysctl_createv(clog, 0, NULL, NULL,
! 2225: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2226: CTLTYPE_INT, "redirect",
! 2227: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
! 2228: NULL, 0, &ipsendredirects, 0,
! 2229: CTL_NET, PF_INET, IPPROTO_IP,
! 2230: IPCTL_SENDREDIRECTS, CTL_EOL);
! 2231: sysctl_createv(clog, 0, NULL, NULL,
! 2232: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2233: CTLTYPE_INT, "ttl",
! 2234: SYSCTL_DESCR("Default TTL for an INET datagram"),
! 2235: NULL, 0, &ip_defttl, 0,
! 2236: CTL_NET, PF_INET, IPPROTO_IP,
! 2237: IPCTL_DEFTTL, CTL_EOL);
! 2238: #ifdef IPCTL_DEFMTU
! 2239: sysctl_createv(clog, 0, NULL, NULL,
! 2240: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
! 2241: CTLTYPE_INT, "mtu",
! 2242: SYSCTL_DESCR("Default MTA for an INET route"),
! 2243: NULL, 0, &ip_mtu, 0,
! 2244: CTL_NET, PF_INET, IPPROTO_IP,
! 2245: IPCTL_DEFMTU, CTL_EOL);
! 2246: #endif /* IPCTL_DEFMTU */
! 2247: sysctl_createv(clog, 0, NULL, NULL,
! 2248: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2249: CTLTYPE_INT, "forwsrcrt",
! 2250: SYSCTL_DESCR("Enable forwarding of source-routed "
! 2251: "datagrams"),
! 2252: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
! 2253: CTL_NET, PF_INET, IPPROTO_IP,
! 2254: IPCTL_FORWSRCRT, CTL_EOL);
! 2255: sysctl_createv(clog, 0, NULL, NULL,
! 2256: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2257: CTLTYPE_INT, "directed-broadcast",
! 2258: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
! 2259: NULL, 0, &ip_directedbcast, 0,
! 2260: CTL_NET, PF_INET, IPPROTO_IP,
! 2261: IPCTL_DIRECTEDBCAST, CTL_EOL);
! 2262: sysctl_createv(clog, 0, NULL, NULL,
! 2263: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2264: CTLTYPE_INT, "allowsrcrt",
! 2265: SYSCTL_DESCR("Accept source-routed datagrams"),
! 2266: NULL, 0, &ip_allowsrcrt, 0,
! 2267: CTL_NET, PF_INET, IPPROTO_IP,
! 2268: IPCTL_ALLOWSRCRT, CTL_EOL);
! 2269: sysctl_createv(clog, 0, NULL, NULL,
! 2270: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2271: CTLTYPE_INT, "subnetsarelocal",
! 2272: SYSCTL_DESCR("Whether logical subnets are considered "
! 2273: "local"),
! 2274: NULL, 0, &subnetsarelocal, 0,
! 2275: CTL_NET, PF_INET, IPPROTO_IP,
! 2276: IPCTL_SUBNETSARELOCAL, CTL_EOL);
! 2277: sysctl_createv(clog, 0, NULL, NULL,
! 2278: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2279: CTLTYPE_INT, "mtudisc",
! 2280: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
! 2281: NULL, 0, &ip_mtudisc, 0,
! 2282: CTL_NET, PF_INET, IPPROTO_IP,
! 2283: IPCTL_MTUDISC, CTL_EOL);
! 2284: sysctl_createv(clog, 0, NULL, NULL,
! 2285: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2286: CTLTYPE_INT, "anonportmin",
! 2287: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
! 2288: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
! 2289: CTL_NET, PF_INET, IPPROTO_IP,
! 2290: IPCTL_ANONPORTMIN, CTL_EOL);
! 2291: sysctl_createv(clog, 0, NULL, NULL,
! 2292: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2293: CTLTYPE_INT, "anonportmax",
! 2294: SYSCTL_DESCR("Highest ephemeral port number to assign"),
! 2295: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
! 2296: CTL_NET, PF_INET, IPPROTO_IP,
! 2297: IPCTL_ANONPORTMAX, CTL_EOL);
! 2298: sysctl_createv(clog, 0, NULL, NULL,
! 2299: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2300: CTLTYPE_INT, "mtudisctimeout",
! 2301: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
! 2302: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
! 2303: CTL_NET, PF_INET, IPPROTO_IP,
! 2304: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
! 2305: #ifdef GATEWAY
! 2306: sysctl_createv(clog, 0, NULL, NULL,
! 2307: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2308: CTLTYPE_INT, "maxflows",
! 2309: SYSCTL_DESCR("Number of flows for fast forwarding"),
! 2310: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
! 2311: CTL_NET, PF_INET, IPPROTO_IP,
! 2312: IPCTL_MAXFLOWS, CTL_EOL);
! 2313: sysctl_createv(clog, 0, NULL, NULL,
! 2314: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2315: CTLTYPE_INT, "hashsize",
! 2316: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
! 2317: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
! 2318: CTL_NET, PF_INET, IPPROTO_IP,
! 2319: CTL_CREATE, CTL_EOL);
! 2320: #endif /* GATEWAY */
! 2321: sysctl_createv(clog, 0, NULL, NULL,
! 2322: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2323: CTLTYPE_INT, "hostzerobroadcast",
! 2324: SYSCTL_DESCR("All zeroes address is broadcast address"),
! 2325: NULL, 0, &hostzeroisbroadcast, 0,
! 2326: CTL_NET, PF_INET, IPPROTO_IP,
! 2327: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
! 2328: #if NGIF > 0
! 2329: sysctl_createv(clog, 0, NULL, NULL,
! 2330: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2331: CTLTYPE_INT, "gifttl",
! 2332: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
! 2333: NULL, 0, &ip_gif_ttl, 0,
! 2334: CTL_NET, PF_INET, IPPROTO_IP,
! 2335: IPCTL_GIF_TTL, CTL_EOL);
! 2336: #endif /* NGIF */
! 2337: #ifndef IPNOPRIVPORTS
! 2338: sysctl_createv(clog, 0, NULL, NULL,
! 2339: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2340: CTLTYPE_INT, "lowportmin",
! 2341: SYSCTL_DESCR("Lowest privileged ephemeral port number "
! 2342: "to assign"),
! 2343: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
! 2344: CTL_NET, PF_INET, IPPROTO_IP,
! 2345: IPCTL_LOWPORTMIN, CTL_EOL);
! 2346: sysctl_createv(clog, 0, NULL, NULL,
! 2347: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2348: CTLTYPE_INT, "lowportmax",
! 2349: SYSCTL_DESCR("Highest privileged ephemeral port number "
! 2350: "to assign"),
! 2351: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
! 2352: CTL_NET, PF_INET, IPPROTO_IP,
! 2353: IPCTL_LOWPORTMAX, CTL_EOL);
! 2354: #endif /* IPNOPRIVPORTS */
! 2355: sysctl_createv(clog, 0, NULL, NULL,
! 2356: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2357: CTLTYPE_INT, "maxfragpackets",
! 2358: SYSCTL_DESCR("Maximum number of fragments to retain for "
! 2359: "possible reassembly"),
! 2360: NULL, 0, &ip_maxfragpackets, 0,
! 2361: CTL_NET, PF_INET, IPPROTO_IP,
! 2362: IPCTL_MAXFRAGPACKETS, CTL_EOL);
! 2363: #if NGRE > 0
! 2364: sysctl_createv(clog, 0, NULL, NULL,
! 2365: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2366: CTLTYPE_INT, "grettl",
! 2367: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
! 2368: NULL, 0, &ip_gre_ttl, 0,
! 2369: CTL_NET, PF_INET, IPPROTO_IP,
! 2370: IPCTL_GRE_TTL, CTL_EOL);
! 2371: #endif /* NGRE */
! 2372: sysctl_createv(clog, 0, NULL, NULL,
! 2373: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2374: CTLTYPE_INT, "checkinterface",
! 2375: SYSCTL_DESCR("Enable receive side of Strong ES model "
! 2376: "from RFC1122"),
! 2377: NULL, 0, &ip_checkinterface, 0,
! 2378: CTL_NET, PF_INET, IPPROTO_IP,
! 2379: IPCTL_CHECKINTERFACE, CTL_EOL);
! 2380: sysctl_createv(clog, 0, NULL, NULL,
! 2381: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2382: CTLTYPE_INT, "random_id",
! 2383: SYSCTL_DESCR("Assign random ip_id values"),
! 2384: NULL, 0, &ip_do_randomid, 0,
! 2385: CTL_NET, PF_INET, IPPROTO_IP,
! 2386: IPCTL_RANDOMID, CTL_EOL);
! 2387: sysctl_createv(clog, 0, NULL, NULL,
! 2388: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 2389: CTLTYPE_INT, "do_loopback_cksum",
! 2390: SYSCTL_DESCR("Perform IP checksum on loopback"),
! 2391: NULL, 0, &ip_do_loopback_cksum, 0,
! 2392: CTL_NET, PF_INET, IPPROTO_IP,
! 2393: IPCTL_LOOPBACKCKSUM, CTL_EOL);
! 2394: sysctl_createv(clog, 0, NULL, NULL,
! 2395: CTLFLAG_PERMANENT,
! 2396: CTLTYPE_STRUCT, "stats",
! 2397: SYSCTL_DESCR("IP statistics"),
! 2398: NULL, 0, &ipstat, sizeof(ipstat),
! 2399: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
! 2400: CTL_EOL);
! 2401: }
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