1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_bootp.h" 36 #include "opt_ipfw.h" 37 #include "opt_ipstealth.h" 38 #include "opt_ipsec.h" 39 #include "opt_route.h" 40 #include "opt_rss.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/malloc.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/time.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/rwlock.h> 53 #include <sys/sdt.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 57 #include <net/pfil.h> 58 #include <net/if.h> 59 #include <net/if_types.h> 60 #include <net/if_var.h> 61 #include <net/if_dl.h> 62 #include <net/route.h> 63 #include <net/netisr.h> 64 #include <net/rss_config.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_kdtrace.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #include <netinet/in_pcb.h> 73 #include <netinet/ip_var.h> 74 #include <netinet/ip_fw.h> 75 #include <netinet/ip_icmp.h> 76 #include <netinet/ip_options.h> 77 #include <machine/in_cksum.h> 78 #include <netinet/ip_carp.h> 79 #ifdef IPSEC 80 #include <netinet/ip_ipsec.h> 81 #endif /* IPSEC */ 82 #include <netinet/in_rss.h> 83 84 #include <sys/socketvar.h> 85 86 #include <security/mac/mac_framework.h> 87 88 #ifdef CTASSERT 89 CTASSERT(sizeof(struct ip) == 20); 90 #endif 91 92 /* IP reassembly functions are defined in ip_reass.c. */ 93 extern void ipreass_init(void); 94 extern void ipreass_drain(void); 95 extern void ipreass_slowtimo(void); 96 #ifdef VIMAGE 97 extern void ipreass_destroy(void); 98 #endif 99 100 struct rwlock in_ifaddr_lock; 101 RW_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock"); 102 103 VNET_DEFINE(int, rsvp_on); 104 105 VNET_DEFINE(int, ipforwarding); 106 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 107 &VNET_NAME(ipforwarding), 0, 108 "Enable IP forwarding between interfaces"); 109 110 static VNET_DEFINE(int, ipsendredirects) = 1; /* XXX */ 111 #define V_ipsendredirects VNET(ipsendredirects) 112 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 113 &VNET_NAME(ipsendredirects), 0, 114 "Enable sending IP redirects"); 115 116 /* 117 * XXX - Setting ip_checkinterface mostly implements the receive side of 118 * the Strong ES model described in RFC 1122, but since the routing table 119 * and transmit implementation do not implement the Strong ES model, 120 * setting this to 1 results in an odd hybrid. 121 * 122 * XXX - ip_checkinterface currently must be disabled if you use ipnat 123 * to translate the destination address to another local interface. 124 * 125 * XXX - ip_checkinterface must be disabled if you add IP aliases 126 * to the loopback interface instead of the interface where the 127 * packets for those addresses are received. 128 */ 129 static VNET_DEFINE(int, ip_checkinterface); 130 #define V_ip_checkinterface VNET(ip_checkinterface) 131 SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_VNET | CTLFLAG_RW, 132 &VNET_NAME(ip_checkinterface), 0, 133 "Verify packet arrives on correct interface"); 134 135 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */ 136 137 static struct netisr_handler ip_nh = { 138 .nh_name = "ip", 139 .nh_handler = ip_input, 140 .nh_proto = NETISR_IP, 141 #ifdef RSS 142 .nh_m2cpuid = rss_soft_m2cpuid, 143 .nh_policy = NETISR_POLICY_CPU, 144 .nh_dispatch = NETISR_DISPATCH_HYBRID, 145 #else 146 .nh_policy = NETISR_POLICY_FLOW, 147 #endif 148 }; 149 150 #ifdef RSS 151 /* 152 * Directly dispatched frames are currently assumed 153 * to have a flowid already calculated. 154 * 155 * It should likely have something that assert it 156 * actually has valid flow details. 157 */ 158 static struct netisr_handler ip_direct_nh = { 159 .nh_name = "ip_direct", 160 .nh_handler = ip_direct_input, 161 .nh_proto = NETISR_IP_DIRECT, 162 .nh_m2cpuid = rss_m2cpuid, 163 .nh_policy = NETISR_POLICY_CPU, 164 .nh_dispatch = NETISR_DISPATCH_HYBRID, 165 }; 166 #endif 167 168 extern struct domain inetdomain; 169 extern struct protosw inetsw[]; 170 u_char ip_protox[IPPROTO_MAX]; 171 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 172 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 173 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 174 175 #ifdef IPCTL_DEFMTU 176 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 177 &ip_mtu, 0, "Default MTU"); 178 #endif 179 180 #ifdef IPSTEALTH 181 VNET_DEFINE(int, ipstealth); 182 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 183 &VNET_NAME(ipstealth), 0, 184 "IP stealth mode, no TTL decrementation on forwarding"); 185 #endif 186 187 /* 188 * IP statistics are stored in the "array" of counter(9)s. 189 */ 190 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 191 VNET_PCPUSTAT_SYSINIT(ipstat); 192 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 193 "IP statistics (struct ipstat, netinet/ip_var.h)"); 194 195 #ifdef VIMAGE 196 VNET_PCPUSTAT_SYSUNINIT(ipstat); 197 #endif /* VIMAGE */ 198 199 /* 200 * Kernel module interface for updating ipstat. The argument is an index 201 * into ipstat treated as an array. 202 */ 203 void 204 kmod_ipstat_inc(int statnum) 205 { 206 207 counter_u64_add(VNET(ipstat)[statnum], 1); 208 } 209 210 void 211 kmod_ipstat_dec(int statnum) 212 { 213 214 counter_u64_add(VNET(ipstat)[statnum], -1); 215 } 216 217 static int 218 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 219 { 220 int error, qlimit; 221 222 netisr_getqlimit(&ip_nh, &qlimit); 223 error = sysctl_handle_int(oidp, &qlimit, 0, req); 224 if (error || !req->newptr) 225 return (error); 226 if (qlimit < 1) 227 return (EINVAL); 228 return (netisr_setqlimit(&ip_nh, qlimit)); 229 } 230 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 231 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I", 232 "Maximum size of the IP input queue"); 233 234 static int 235 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 236 { 237 u_int64_t qdrops_long; 238 int error, qdrops; 239 240 netisr_getqdrops(&ip_nh, &qdrops_long); 241 qdrops = qdrops_long; 242 error = sysctl_handle_int(oidp, &qdrops, 0, req); 243 if (error || !req->newptr) 244 return (error); 245 if (qdrops != 0) 246 return (EINVAL); 247 netisr_clearqdrops(&ip_nh); 248 return (0); 249 } 250 251 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 252 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I", 253 "Number of packets dropped from the IP input queue"); 254 255 #ifdef RSS 256 static int 257 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 258 { 259 int error, qlimit; 260 261 netisr_getqlimit(&ip_direct_nh, &qlimit); 262 error = sysctl_handle_int(oidp, &qlimit, 0, req); 263 if (error || !req->newptr) 264 return (error); 265 if (qlimit < 1) 266 return (EINVAL); 267 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 268 } 269 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_direct_queue_maxlen, 270 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_direct_queue_maxlen, "I", 271 "Maximum size of the IP direct input queue"); 272 273 static int 274 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 275 { 276 u_int64_t qdrops_long; 277 int error, qdrops; 278 279 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 280 qdrops = qdrops_long; 281 error = sysctl_handle_int(oidp, &qdrops, 0, req); 282 if (error || !req->newptr) 283 return (error); 284 if (qdrops != 0) 285 return (EINVAL); 286 netisr_clearqdrops(&ip_direct_nh); 287 return (0); 288 } 289 290 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_direct_queue_drops, 291 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_direct_queue_drops, "I", 292 "Number of packets dropped from the IP direct input queue"); 293 #endif /* RSS */ 294 295 /* 296 * IP initialization: fill in IP protocol switch table. 297 * All protocols not implemented in kernel go to raw IP protocol handler. 298 */ 299 void 300 ip_init(void) 301 { 302 struct protosw *pr; 303 int i; 304 305 TAILQ_INIT(&V_in_ifaddrhead); 306 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 307 308 /* Initialize IP reassembly queue. */ 309 ipreass_init(); 310 311 /* Initialize packet filter hooks. */ 312 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF; 313 V_inet_pfil_hook.ph_af = AF_INET; 314 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0) 315 printf("%s: WARNING: unable to register pfil hook, " 316 "error %d\n", __func__, i); 317 318 /* Skip initialization of globals for non-default instances. */ 319 if (!IS_DEFAULT_VNET(curvnet)) 320 return; 321 322 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 323 if (pr == NULL) 324 panic("ip_init: PF_INET not found"); 325 326 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */ 327 for (i = 0; i < IPPROTO_MAX; i++) 328 ip_protox[i] = pr - inetsw; 329 /* 330 * Cycle through IP protocols and put them into the appropriate place 331 * in ip_protox[]. 332 */ 333 for (pr = inetdomain.dom_protosw; 334 pr < inetdomain.dom_protoswNPROTOSW; pr++) 335 if (pr->pr_domain->dom_family == PF_INET && 336 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 337 /* Be careful to only index valid IP protocols. */ 338 if (pr->pr_protocol < IPPROTO_MAX) 339 ip_protox[pr->pr_protocol] = pr - inetsw; 340 } 341 342 netisr_register(&ip_nh); 343 #ifdef RSS 344 netisr_register(&ip_direct_nh); 345 #endif 346 } 347 348 #ifdef VIMAGE 349 void 350 ip_destroy(void) 351 { 352 int i; 353 354 if ((i = pfil_head_unregister(&V_inet_pfil_hook)) != 0) 355 printf("%s: WARNING: unable to unregister pfil hook, " 356 "error %d\n", __func__, i); 357 358 /* Cleanup in_ifaddr hash table; should be empty. */ 359 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 360 361 /* Destroy IP reassembly queue. */ 362 ipreass_destroy(); 363 } 364 #endif 365 366 #ifdef RSS 367 /* 368 * IP direct input routine. 369 * 370 * This is called when reinjecting completed fragments where 371 * all of the previous checking and book-keeping has been done. 372 */ 373 void 374 ip_direct_input(struct mbuf *m) 375 { 376 struct ip *ip; 377 int hlen; 378 379 ip = mtod(m, struct ip *); 380 hlen = ip->ip_hl << 2; 381 382 IPSTAT_INC(ips_delivered); 383 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 384 return; 385 } 386 #endif 387 388 /* 389 * Ip input routine. Checksum and byte swap header. If fragmented 390 * try to reassemble. Process options. Pass to next level. 391 */ 392 void 393 ip_input(struct mbuf *m) 394 { 395 struct ip *ip = NULL; 396 struct in_ifaddr *ia = NULL; 397 struct ifaddr *ifa; 398 struct ifnet *ifp; 399 int checkif, hlen = 0; 400 uint16_t sum, ip_len; 401 int dchg = 0; /* dest changed after fw */ 402 struct in_addr odst; /* original dst address */ 403 404 M_ASSERTPKTHDR(m); 405 406 if (m->m_flags & M_FASTFWD_OURS) { 407 m->m_flags &= ~M_FASTFWD_OURS; 408 /* Set up some basics that will be used later. */ 409 ip = mtod(m, struct ip *); 410 hlen = ip->ip_hl << 2; 411 ip_len = ntohs(ip->ip_len); 412 goto ours; 413 } 414 415 IPSTAT_INC(ips_total); 416 417 if (m->m_pkthdr.len < sizeof(struct ip)) 418 goto tooshort; 419 420 if (m->m_len < sizeof (struct ip) && 421 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 422 IPSTAT_INC(ips_toosmall); 423 return; 424 } 425 ip = mtod(m, struct ip *); 426 427 if (ip->ip_v != IPVERSION) { 428 IPSTAT_INC(ips_badvers); 429 goto bad; 430 } 431 432 hlen = ip->ip_hl << 2; 433 if (hlen < sizeof(struct ip)) { /* minimum header length */ 434 IPSTAT_INC(ips_badhlen); 435 goto bad; 436 } 437 if (hlen > m->m_len) { 438 if ((m = m_pullup(m, hlen)) == NULL) { 439 IPSTAT_INC(ips_badhlen); 440 return; 441 } 442 ip = mtod(m, struct ip *); 443 } 444 445 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 446 447 /* 127/8 must not appear on wire - RFC1122 */ 448 ifp = m->m_pkthdr.rcvif; 449 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 450 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 451 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 452 IPSTAT_INC(ips_badaddr); 453 goto bad; 454 } 455 } 456 457 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 458 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 459 } else { 460 if (hlen == sizeof(struct ip)) { 461 sum = in_cksum_hdr(ip); 462 } else { 463 sum = in_cksum(m, hlen); 464 } 465 } 466 if (sum) { 467 IPSTAT_INC(ips_badsum); 468 goto bad; 469 } 470 471 #ifdef ALTQ 472 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) 473 /* packet is dropped by traffic conditioner */ 474 return; 475 #endif 476 477 ip_len = ntohs(ip->ip_len); 478 if (ip_len < hlen) { 479 IPSTAT_INC(ips_badlen); 480 goto bad; 481 } 482 483 /* 484 * Check that the amount of data in the buffers 485 * is as at least much as the IP header would have us expect. 486 * Trim mbufs if longer than we expect. 487 * Drop packet if shorter than we expect. 488 */ 489 if (m->m_pkthdr.len < ip_len) { 490 tooshort: 491 IPSTAT_INC(ips_tooshort); 492 goto bad; 493 } 494 if (m->m_pkthdr.len > ip_len) { 495 if (m->m_len == m->m_pkthdr.len) { 496 m->m_len = ip_len; 497 m->m_pkthdr.len = ip_len; 498 } else 499 m_adj(m, ip_len - m->m_pkthdr.len); 500 } 501 502 #ifdef IPSEC 503 /* 504 * Bypass packet filtering for packets previously handled by IPsec. 505 */ 506 if (ip_ipsec_filtertunnel(m)) 507 goto passin; 508 #endif /* IPSEC */ 509 510 /* 511 * Run through list of hooks for input packets. 512 * 513 * NB: Beware of the destination address changing (e.g. 514 * by NAT rewriting). When this happens, tell 515 * ip_forward to do the right thing. 516 */ 517 518 /* Jump over all PFIL processing if hooks are not active. */ 519 if (!PFIL_HOOKED(&V_inet_pfil_hook)) 520 goto passin; 521 522 odst = ip->ip_dst; 523 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0) 524 return; 525 if (m == NULL) /* consumed by filter */ 526 return; 527 528 ip = mtod(m, struct ip *); 529 dchg = (odst.s_addr != ip->ip_dst.s_addr); 530 ifp = m->m_pkthdr.rcvif; 531 532 if (m->m_flags & M_FASTFWD_OURS) { 533 m->m_flags &= ~M_FASTFWD_OURS; 534 goto ours; 535 } 536 if (m->m_flags & M_IP_NEXTHOP) { 537 dchg = (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL); 538 if (dchg != 0) { 539 /* 540 * Directly ship the packet on. This allows 541 * forwarding packets originally destined to us 542 * to some other directly connected host. 543 */ 544 ip_forward(m, 1); 545 return; 546 } 547 } 548 passin: 549 550 /* 551 * Process options and, if not destined for us, 552 * ship it on. ip_dooptions returns 1 when an 553 * error was detected (causing an icmp message 554 * to be sent and the original packet to be freed). 555 */ 556 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 557 return; 558 559 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 560 * matter if it is destined to another node, or whether it is 561 * a multicast one, RSVP wants it! and prevents it from being forwarded 562 * anywhere else. Also checks if the rsvp daemon is running before 563 * grabbing the packet. 564 */ 565 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP) 566 goto ours; 567 568 /* 569 * Check our list of addresses, to see if the packet is for us. 570 * If we don't have any addresses, assume any unicast packet 571 * we receive might be for us (and let the upper layers deal 572 * with it). 573 */ 574 if (TAILQ_EMPTY(&V_in_ifaddrhead) && 575 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 576 goto ours; 577 578 /* 579 * Enable a consistency check between the destination address 580 * and the arrival interface for a unicast packet (the RFC 1122 581 * strong ES model) if IP forwarding is disabled and the packet 582 * is not locally generated and the packet is not subject to 583 * 'ipfw fwd'. 584 * 585 * XXX - Checking also should be disabled if the destination 586 * address is ipnat'ed to a different interface. 587 * 588 * XXX - Checking is incompatible with IP aliases added 589 * to the loopback interface instead of the interface where 590 * the packets are received. 591 * 592 * XXX - This is the case for carp vhost IPs as well so we 593 * insert a workaround. If the packet got here, we already 594 * checked with carp_iamatch() and carp_forus(). 595 */ 596 checkif = V_ip_checkinterface && (V_ipforwarding == 0) && 597 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) && 598 ifp->if_carp == NULL && (dchg == 0); 599 600 /* 601 * Check for exact addresses in the hash bucket. 602 */ 603 /* IN_IFADDR_RLOCK(); */ 604 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 605 /* 606 * If the address matches, verify that the packet 607 * arrived via the correct interface if checking is 608 * enabled. 609 */ 610 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr && 611 (!checkif || ia->ia_ifp == ifp)) { 612 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 613 counter_u64_add(ia->ia_ifa.ifa_ibytes, 614 m->m_pkthdr.len); 615 /* IN_IFADDR_RUNLOCK(); */ 616 goto ours; 617 } 618 } 619 /* IN_IFADDR_RUNLOCK(); */ 620 621 /* 622 * Check for broadcast addresses. 623 * 624 * Only accept broadcast packets that arrive via the matching 625 * interface. Reception of forwarded directed broadcasts would 626 * be handled via ip_forward() and ether_output() with the loopback 627 * into the stack for SIMPLEX interfaces handled by ether_output(). 628 */ 629 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) { 630 IF_ADDR_RLOCK(ifp); 631 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 632 if (ifa->ifa_addr->sa_family != AF_INET) 633 continue; 634 ia = ifatoia(ifa); 635 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 636 ip->ip_dst.s_addr) { 637 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 638 counter_u64_add(ia->ia_ifa.ifa_ibytes, 639 m->m_pkthdr.len); 640 IF_ADDR_RUNLOCK(ifp); 641 goto ours; 642 } 643 #ifdef BOOTP_COMPAT 644 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 645 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 646 counter_u64_add(ia->ia_ifa.ifa_ibytes, 647 m->m_pkthdr.len); 648 IF_ADDR_RUNLOCK(ifp); 649 goto ours; 650 } 651 #endif 652 } 653 IF_ADDR_RUNLOCK(ifp); 654 ia = NULL; 655 } 656 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */ 657 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) { 658 IPSTAT_INC(ips_cantforward); 659 m_freem(m); 660 return; 661 } 662 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 663 if (V_ip_mrouter) { 664 /* 665 * If we are acting as a multicast router, all 666 * incoming multicast packets are passed to the 667 * kernel-level multicast forwarding function. 668 * The packet is returned (relatively) intact; if 669 * ip_mforward() returns a non-zero value, the packet 670 * must be discarded, else it may be accepted below. 671 */ 672 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 673 IPSTAT_INC(ips_cantforward); 674 m_freem(m); 675 return; 676 } 677 678 /* 679 * The process-level routing daemon needs to receive 680 * all multicast IGMP packets, whether or not this 681 * host belongs to their destination groups. 682 */ 683 if (ip->ip_p == IPPROTO_IGMP) 684 goto ours; 685 IPSTAT_INC(ips_forward); 686 } 687 /* 688 * Assume the packet is for us, to avoid prematurely taking 689 * a lock on the in_multi hash. Protocols must perform 690 * their own filtering and update statistics accordingly. 691 */ 692 goto ours; 693 } 694 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 695 goto ours; 696 if (ip->ip_dst.s_addr == INADDR_ANY) 697 goto ours; 698 699 /* 700 * Not for us; forward if possible and desirable. 701 */ 702 if (V_ipforwarding == 0) { 703 IPSTAT_INC(ips_cantforward); 704 m_freem(m); 705 } else { 706 ip_forward(m, dchg); 707 } 708 return; 709 710 ours: 711 #ifdef IPSTEALTH 712 /* 713 * IPSTEALTH: Process non-routing options only 714 * if the packet is destined for us. 715 */ 716 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 717 return; 718 #endif /* IPSTEALTH */ 719 720 /* 721 * Attempt reassembly; if it succeeds, proceed. 722 * ip_reass() will return a different mbuf. 723 */ 724 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 725 /* XXXGL: shouldn't we save & set m_flags? */ 726 m = ip_reass(m); 727 if (m == NULL) 728 return; 729 ip = mtod(m, struct ip *); 730 /* Get the header length of the reassembled packet */ 731 hlen = ip->ip_hl << 2; 732 } 733 734 #ifdef IPSEC 735 /* 736 * enforce IPsec policy checking if we are seeing last header. 737 * note that we do not visit this with protocols with pcb layer 738 * code - like udp/tcp/raw ip. 739 */ 740 if (ip_ipsec_input(m, ip->ip_p) != 0) 741 goto bad; 742 #endif /* IPSEC */ 743 744 /* 745 * Switch out to protocol's input routine. 746 */ 747 IPSTAT_INC(ips_delivered); 748 749 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 750 return; 751 bad: 752 m_freem(m); 753 } 754 755 /* 756 * IP timer processing; 757 * if a timer expires on a reassembly 758 * queue, discard it. 759 */ 760 void 761 ip_slowtimo(void) 762 { 763 VNET_ITERATOR_DECL(vnet_iter); 764 765 VNET_LIST_RLOCK_NOSLEEP(); 766 VNET_FOREACH(vnet_iter) { 767 CURVNET_SET(vnet_iter); 768 ipreass_slowtimo(); 769 CURVNET_RESTORE(); 770 } 771 VNET_LIST_RUNLOCK_NOSLEEP(); 772 } 773 774 void 775 ip_drain(void) 776 { 777 VNET_ITERATOR_DECL(vnet_iter); 778 779 VNET_LIST_RLOCK_NOSLEEP(); 780 VNET_FOREACH(vnet_iter) { 781 CURVNET_SET(vnet_iter); 782 ipreass_drain(); 783 CURVNET_RESTORE(); 784 } 785 VNET_LIST_RUNLOCK_NOSLEEP(); 786 } 787 788 /* 789 * The protocol to be inserted into ip_protox[] must be already registered 790 * in inetsw[], either statically or through pf_proto_register(). 791 */ 792 int 793 ipproto_register(short ipproto) 794 { 795 struct protosw *pr; 796 797 /* Sanity checks. */ 798 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 799 return (EPROTONOSUPPORT); 800 801 /* 802 * The protocol slot must not be occupied by another protocol 803 * already. An index pointing to IPPROTO_RAW is unused. 804 */ 805 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 806 if (pr == NULL) 807 return (EPFNOSUPPORT); 808 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 809 return (EEXIST); 810 811 /* Find the protocol position in inetsw[] and set the index. */ 812 for (pr = inetdomain.dom_protosw; 813 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 814 if (pr->pr_domain->dom_family == PF_INET && 815 pr->pr_protocol && pr->pr_protocol == ipproto) { 816 ip_protox[pr->pr_protocol] = pr - inetsw; 817 return (0); 818 } 819 } 820 return (EPROTONOSUPPORT); 821 } 822 823 int 824 ipproto_unregister(short ipproto) 825 { 826 struct protosw *pr; 827 828 /* Sanity checks. */ 829 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 830 return (EPROTONOSUPPORT); 831 832 /* Check if the protocol was indeed registered. */ 833 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 834 if (pr == NULL) 835 return (EPFNOSUPPORT); 836 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 837 return (ENOENT); 838 839 /* Reset the protocol slot to IPPROTO_RAW. */ 840 ip_protox[ipproto] = pr - inetsw; 841 return (0); 842 } 843 844 /* 845 * Given address of next destination (final or next hop), return (referenced) 846 * internet address info of interface to be used to get there. 847 */ 848 struct in_ifaddr * 849 ip_rtaddr(struct in_addr dst, u_int fibnum) 850 { 851 struct route sro; 852 struct sockaddr_in *sin; 853 struct in_ifaddr *ia; 854 855 bzero(&sro, sizeof(sro)); 856 sin = (struct sockaddr_in *)&sro.ro_dst; 857 sin->sin_family = AF_INET; 858 sin->sin_len = sizeof(*sin); 859 sin->sin_addr = dst; 860 in_rtalloc_ign(&sro, 0, fibnum); 861 862 if (sro.ro_rt == NULL) 863 return (NULL); 864 865 ia = ifatoia(sro.ro_rt->rt_ifa); 866 ifa_ref(&ia->ia_ifa); 867 RTFREE(sro.ro_rt); 868 return (ia); 869 } 870 871 u_char inetctlerrmap[PRC_NCMDS] = { 872 0, 0, 0, 0, 873 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 874 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 875 EMSGSIZE, EHOSTUNREACH, 0, 0, 876 0, 0, EHOSTUNREACH, 0, 877 ENOPROTOOPT, ECONNREFUSED 878 }; 879 880 /* 881 * Forward a packet. If some error occurs return the sender 882 * an icmp packet. Note we can't always generate a meaningful 883 * icmp message because icmp doesn't have a large enough repertoire 884 * of codes and types. 885 * 886 * If not forwarding, just drop the packet. This could be confusing 887 * if ipforwarding was zero but some routing protocol was advancing 888 * us as a gateway to somewhere. However, we must let the routing 889 * protocol deal with that. 890 * 891 * The srcrt parameter indicates whether the packet is being forwarded 892 * via a source route. 893 */ 894 void 895 ip_forward(struct mbuf *m, int srcrt) 896 { 897 struct ip *ip = mtod(m, struct ip *); 898 struct in_ifaddr *ia; 899 struct mbuf *mcopy; 900 struct in_addr dest; 901 struct route ro; 902 int error, type = 0, code = 0, mtu = 0; 903 904 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 905 IPSTAT_INC(ips_cantforward); 906 m_freem(m); 907 return; 908 } 909 #ifdef IPSEC 910 if (ip_ipsec_fwd(m) != 0) { 911 IPSTAT_INC(ips_cantforward); 912 m_freem(m); 913 return; 914 } 915 #endif /* IPSEC */ 916 #ifdef IPSTEALTH 917 if (!V_ipstealth) { 918 #endif 919 if (ip->ip_ttl <= IPTTLDEC) { 920 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 921 0, 0); 922 return; 923 } 924 #ifdef IPSTEALTH 925 } 926 #endif 927 928 ia = ip_rtaddr(ip->ip_dst, M_GETFIB(m)); 929 #ifndef IPSEC 930 /* 931 * 'ia' may be NULL if there is no route for this destination. 932 * In case of IPsec, Don't discard it just yet, but pass it to 933 * ip_output in case of outgoing IPsec policy. 934 */ 935 if (!srcrt && ia == NULL) { 936 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 937 return; 938 } 939 #endif 940 941 /* 942 * Save the IP header and at most 8 bytes of the payload, 943 * in case we need to generate an ICMP message to the src. 944 * 945 * XXX this can be optimized a lot by saving the data in a local 946 * buffer on the stack (72 bytes at most), and only allocating the 947 * mbuf if really necessary. The vast majority of the packets 948 * are forwarded without having to send an ICMP back (either 949 * because unnecessary, or because rate limited), so we are 950 * really we are wasting a lot of work here. 951 * 952 * We don't use m_copy() because it might return a reference 953 * to a shared cluster. Both this function and ip_output() 954 * assume exclusive access to the IP header in `m', so any 955 * data in a cluster may change before we reach icmp_error(). 956 */ 957 mcopy = m_gethdr(M_NOWAIT, m->m_type); 958 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 959 /* 960 * It's probably ok if the pkthdr dup fails (because 961 * the deep copy of the tag chain failed), but for now 962 * be conservative and just discard the copy since 963 * code below may some day want the tags. 964 */ 965 m_free(mcopy); 966 mcopy = NULL; 967 } 968 if (mcopy != NULL) { 969 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 970 mcopy->m_pkthdr.len = mcopy->m_len; 971 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 972 } 973 974 #ifdef IPSTEALTH 975 if (!V_ipstealth) { 976 #endif 977 ip->ip_ttl -= IPTTLDEC; 978 #ifdef IPSTEALTH 979 } 980 #endif 981 982 /* 983 * If forwarding packet using same interface that it came in on, 984 * perhaps should send a redirect to sender to shortcut a hop. 985 * Only send redirect if source is sending directly to us, 986 * and if packet was not source routed (or has any options). 987 * Also, don't send redirect if forwarding using a default route 988 * or a route modified by a redirect. 989 */ 990 dest.s_addr = 0; 991 if (!srcrt && V_ipsendredirects && 992 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 993 struct sockaddr_in *sin; 994 struct rtentry *rt; 995 996 bzero(&ro, sizeof(ro)); 997 sin = (struct sockaddr_in *)&ro.ro_dst; 998 sin->sin_family = AF_INET; 999 sin->sin_len = sizeof(*sin); 1000 sin->sin_addr = ip->ip_dst; 1001 in_rtalloc_ign(&ro, 0, M_GETFIB(m)); 1002 1003 rt = ro.ro_rt; 1004 1005 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1006 satosin(rt_key(rt))->sin_addr.s_addr != 0) { 1007 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1008 u_long src = ntohl(ip->ip_src.s_addr); 1009 1010 if (RTA(rt) && 1011 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 1012 if (rt->rt_flags & RTF_GATEWAY) 1013 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr; 1014 else 1015 dest.s_addr = ip->ip_dst.s_addr; 1016 /* Router requirements says to only send host redirects */ 1017 type = ICMP_REDIRECT; 1018 code = ICMP_REDIRECT_HOST; 1019 } 1020 } 1021 if (rt) 1022 RTFREE(rt); 1023 } 1024 1025 /* 1026 * Try to cache the route MTU from ip_output so we can consider it for 1027 * the ICMP_UNREACH_NEEDFRAG "Next-Hop MTU" field described in RFC1191. 1028 */ 1029 bzero(&ro, sizeof(ro)); 1030 1031 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1032 1033 if (error == EMSGSIZE && ro.ro_rt) 1034 mtu = ro.ro_rt->rt_mtu; 1035 RO_RTFREE(&ro); 1036 1037 if (error) 1038 IPSTAT_INC(ips_cantforward); 1039 else { 1040 IPSTAT_INC(ips_forward); 1041 if (type) 1042 IPSTAT_INC(ips_redirectsent); 1043 else { 1044 if (mcopy) 1045 m_freem(mcopy); 1046 if (ia != NULL) 1047 ifa_free(&ia->ia_ifa); 1048 return; 1049 } 1050 } 1051 if (mcopy == NULL) { 1052 if (ia != NULL) 1053 ifa_free(&ia->ia_ifa); 1054 return; 1055 } 1056 1057 switch (error) { 1058 1059 case 0: /* forwarded, but need redirect */ 1060 /* type, code set above */ 1061 break; 1062 1063 case ENETUNREACH: 1064 case EHOSTUNREACH: 1065 case ENETDOWN: 1066 case EHOSTDOWN: 1067 default: 1068 type = ICMP_UNREACH; 1069 code = ICMP_UNREACH_HOST; 1070 break; 1071 1072 case EMSGSIZE: 1073 type = ICMP_UNREACH; 1074 code = ICMP_UNREACH_NEEDFRAG; 1075 1076 #ifdef IPSEC 1077 /* 1078 * If IPsec is configured for this path, 1079 * override any possibly mtu value set by ip_output. 1080 */ 1081 mtu = ip_ipsec_mtu(mcopy, mtu); 1082 #endif /* IPSEC */ 1083 /* 1084 * If the MTU was set before make sure we are below the 1085 * interface MTU. 1086 * If the MTU wasn't set before use the interface mtu or 1087 * fall back to the next smaller mtu step compared to the 1088 * current packet size. 1089 */ 1090 if (mtu != 0) { 1091 if (ia != NULL) 1092 mtu = min(mtu, ia->ia_ifp->if_mtu); 1093 } else { 1094 if (ia != NULL) 1095 mtu = ia->ia_ifp->if_mtu; 1096 else 1097 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1098 } 1099 IPSTAT_INC(ips_cantfrag); 1100 break; 1101 1102 case ENOBUFS: 1103 case EACCES: /* ipfw denied packet */ 1104 m_freem(mcopy); 1105 if (ia != NULL) 1106 ifa_free(&ia->ia_ifa); 1107 return; 1108 } 1109 if (ia != NULL) 1110 ifa_free(&ia->ia_ifa); 1111 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1112 } 1113 1114 void 1115 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1116 struct mbuf *m) 1117 { 1118 1119 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) { 1120 struct bintime bt; 1121 1122 bintime(&bt); 1123 if (inp->inp_socket->so_options & SO_BINTIME) { 1124 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1125 SCM_BINTIME, SOL_SOCKET); 1126 if (*mp) 1127 mp = &(*mp)->m_next; 1128 } 1129 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1130 struct timeval tv; 1131 1132 bintime2timeval(&bt, &tv); 1133 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1134 SCM_TIMESTAMP, SOL_SOCKET); 1135 if (*mp) 1136 mp = &(*mp)->m_next; 1137 } 1138 } 1139 if (inp->inp_flags & INP_RECVDSTADDR) { 1140 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1141 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1142 if (*mp) 1143 mp = &(*mp)->m_next; 1144 } 1145 if (inp->inp_flags & INP_RECVTTL) { 1146 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1147 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1148 if (*mp) 1149 mp = &(*mp)->m_next; 1150 } 1151 #ifdef notyet 1152 /* XXX 1153 * Moving these out of udp_input() made them even more broken 1154 * than they already were. 1155 */ 1156 /* options were tossed already */ 1157 if (inp->inp_flags & INP_RECVOPTS) { 1158 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1159 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1160 if (*mp) 1161 mp = &(*mp)->m_next; 1162 } 1163 /* ip_srcroute doesn't do what we want here, need to fix */ 1164 if (inp->inp_flags & INP_RECVRETOPTS) { 1165 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1166 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1167 if (*mp) 1168 mp = &(*mp)->m_next; 1169 } 1170 #endif 1171 if (inp->inp_flags & INP_RECVIF) { 1172 struct ifnet *ifp; 1173 struct sdlbuf { 1174 struct sockaddr_dl sdl; 1175 u_char pad[32]; 1176 } sdlbuf; 1177 struct sockaddr_dl *sdp; 1178 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1179 1180 if ((ifp = m->m_pkthdr.rcvif) && 1181 ifp->if_index && ifp->if_index <= V_if_index) { 1182 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1183 /* 1184 * Change our mind and don't try copy. 1185 */ 1186 if (sdp->sdl_family != AF_LINK || 1187 sdp->sdl_len > sizeof(sdlbuf)) { 1188 goto makedummy; 1189 } 1190 bcopy(sdp, sdl2, sdp->sdl_len); 1191 } else { 1192 makedummy: 1193 sdl2->sdl_len = 1194 offsetof(struct sockaddr_dl, sdl_data[0]); 1195 sdl2->sdl_family = AF_LINK; 1196 sdl2->sdl_index = 0; 1197 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1198 } 1199 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1200 IP_RECVIF, IPPROTO_IP); 1201 if (*mp) 1202 mp = &(*mp)->m_next; 1203 } 1204 if (inp->inp_flags & INP_RECVTOS) { 1205 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1206 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1207 if (*mp) 1208 mp = &(*mp)->m_next; 1209 } 1210 1211 if (inp->inp_flags2 & INP_RECVFLOWID) { 1212 uint32_t flowid, flow_type; 1213 1214 flowid = m->m_pkthdr.flowid; 1215 flow_type = M_HASHTYPE_GET(m); 1216 1217 /* 1218 * XXX should handle the failure of one or the 1219 * other - don't populate both? 1220 */ 1221 *mp = sbcreatecontrol((caddr_t) &flowid, 1222 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1223 if (*mp) 1224 mp = &(*mp)->m_next; 1225 *mp = sbcreatecontrol((caddr_t) &flow_type, 1226 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1227 if (*mp) 1228 mp = &(*mp)->m_next; 1229 } 1230 1231 #ifdef RSS 1232 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1233 uint32_t flowid, flow_type; 1234 uint32_t rss_bucketid; 1235 1236 flowid = m->m_pkthdr.flowid; 1237 flow_type = M_HASHTYPE_GET(m); 1238 1239 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1240 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1241 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1242 if (*mp) 1243 mp = &(*mp)->m_next; 1244 } 1245 } 1246 #endif 1247 } 1248 1249 /* 1250 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1251 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1252 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1253 * compiled. 1254 */ 1255 static VNET_DEFINE(int, ip_rsvp_on); 1256 VNET_DEFINE(struct socket *, ip_rsvpd); 1257 1258 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1259 1260 int 1261 ip_rsvp_init(struct socket *so) 1262 { 1263 1264 if (so->so_type != SOCK_RAW || 1265 so->so_proto->pr_protocol != IPPROTO_RSVP) 1266 return EOPNOTSUPP; 1267 1268 if (V_ip_rsvpd != NULL) 1269 return EADDRINUSE; 1270 1271 V_ip_rsvpd = so; 1272 /* 1273 * This may seem silly, but we need to be sure we don't over-increment 1274 * the RSVP counter, in case something slips up. 1275 */ 1276 if (!V_ip_rsvp_on) { 1277 V_ip_rsvp_on = 1; 1278 V_rsvp_on++; 1279 } 1280 1281 return 0; 1282 } 1283 1284 int 1285 ip_rsvp_done(void) 1286 { 1287 1288 V_ip_rsvpd = NULL; 1289 /* 1290 * This may seem silly, but we need to be sure we don't over-decrement 1291 * the RSVP counter, in case something slips up. 1292 */ 1293 if (V_ip_rsvp_on) { 1294 V_ip_rsvp_on = 0; 1295 V_rsvp_on--; 1296 } 1297 return 0; 1298 } 1299 1300 int 1301 rsvp_input(struct mbuf **mp, int *offp, int proto) 1302 { 1303 struct mbuf *m; 1304 1305 m = *mp; 1306 *mp = NULL; 1307 1308 if (rsvp_input_p) { /* call the real one if loaded */ 1309 *mp = m; 1310 rsvp_input_p(mp, offp, proto); 1311 return (IPPROTO_DONE); 1312 } 1313 1314 /* Can still get packets with rsvp_on = 0 if there is a local member 1315 * of the group to which the RSVP packet is addressed. But in this 1316 * case we want to throw the packet away. 1317 */ 1318 1319 if (!V_rsvp_on) { 1320 m_freem(m); 1321 return (IPPROTO_DONE); 1322 } 1323 1324 if (V_ip_rsvpd != NULL) { 1325 *mp = m; 1326 rip_input(mp, offp, proto); 1327 return (IPPROTO_DONE); 1328 } 1329 /* Drop the packet */ 1330 m_freem(m); 1331 return (IPPROTO_DONE); 1332 } 1333