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/hhook.h> 45 #include <sys/mbuf.h> 46 #include <sys/malloc.h> 47 #include <sys/domain.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/time.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/rmlock.h> 54 #include <sys/rwlock.h> 55 #include <sys/sdt.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 59 #include <net/pfil.h> 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/if_var.h> 63 #include <net/if_dl.h> 64 #include <net/route.h> 65 #include <net/netisr.h> 66 #include <net/rss_config.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_kdtrace.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/in_var.h> 73 #include <netinet/ip.h> 74 #include <netinet/in_pcb.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_fw.h> 77 #include <netinet/ip_icmp.h> 78 #include <netinet/ip_options.h> 79 #include <machine/in_cksum.h> 80 #include <netinet/ip_carp.h> 81 #ifdef IPSEC 82 #include <netinet/ip_ipsec.h> 83 #include <netipsec/ipsec.h> 84 #include <netipsec/key.h> 85 #endif /* IPSEC */ 86 #include <netinet/in_rss.h> 87 88 #include <sys/socketvar.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #ifdef CTASSERT 93 CTASSERT(sizeof(struct ip) == 20); 94 #endif 95 96 /* IP reassembly functions are defined in ip_reass.c. */ 97 extern void ipreass_init(void); 98 extern void ipreass_drain(void); 99 extern void ipreass_slowtimo(void); 100 #ifdef VIMAGE 101 extern void ipreass_destroy(void); 102 #endif 103 104 struct rmlock in_ifaddr_lock; 105 RM_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock"); 106 107 VNET_DEFINE(int, rsvp_on); 108 109 VNET_DEFINE(int, ipforwarding); 110 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 111 &VNET_NAME(ipforwarding), 0, 112 "Enable IP forwarding between interfaces"); 113 114 static VNET_DEFINE(int, ipsendredirects) = 1; /* XXX */ 115 #define V_ipsendredirects VNET(ipsendredirects) 116 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 117 &VNET_NAME(ipsendredirects), 0, 118 "Enable sending IP redirects"); 119 120 /* 121 * XXX - Setting ip_checkinterface mostly implements the receive side of 122 * the Strong ES model described in RFC 1122, but since the routing table 123 * and transmit implementation do not implement the Strong ES model, 124 * setting this to 1 results in an odd hybrid. 125 * 126 * XXX - ip_checkinterface currently must be disabled if you use ipnat 127 * to translate the destination address to another local interface. 128 * 129 * XXX - ip_checkinterface must be disabled if you add IP aliases 130 * to the loopback interface instead of the interface where the 131 * packets for those addresses are received. 132 */ 133 static VNET_DEFINE(int, ip_checkinterface); 134 #define V_ip_checkinterface VNET(ip_checkinterface) 135 SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_VNET | CTLFLAG_RW, 136 &VNET_NAME(ip_checkinterface), 0, 137 "Verify packet arrives on correct interface"); 138 139 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */ 140 141 static struct netisr_handler ip_nh = { 142 .nh_name = "ip", 143 .nh_handler = ip_input, 144 .nh_proto = NETISR_IP, 145 #ifdef RSS 146 .nh_m2cpuid = rss_soft_m2cpuid_v4, 147 .nh_policy = NETISR_POLICY_CPU, 148 .nh_dispatch = NETISR_DISPATCH_HYBRID, 149 #else 150 .nh_policy = NETISR_POLICY_FLOW, 151 #endif 152 }; 153 154 #ifdef RSS 155 /* 156 * Directly dispatched frames are currently assumed 157 * to have a flowid already calculated. 158 * 159 * It should likely have something that assert it 160 * actually has valid flow details. 161 */ 162 static struct netisr_handler ip_direct_nh = { 163 .nh_name = "ip_direct", 164 .nh_handler = ip_direct_input, 165 .nh_proto = NETISR_IP_DIRECT, 166 .nh_m2cpuid = rss_soft_m2cpuid_v4, 167 .nh_policy = NETISR_POLICY_CPU, 168 .nh_dispatch = NETISR_DISPATCH_HYBRID, 169 }; 170 #endif 171 172 extern struct domain inetdomain; 173 extern struct protosw inetsw[]; 174 u_char ip_protox[IPPROTO_MAX]; 175 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 176 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 177 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 178 179 #ifdef IPCTL_DEFMTU 180 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 181 &ip_mtu, 0, "Default MTU"); 182 #endif 183 184 #ifdef IPSTEALTH 185 VNET_DEFINE(int, ipstealth); 186 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 187 &VNET_NAME(ipstealth), 0, 188 "IP stealth mode, no TTL decrementation on forwarding"); 189 #endif 190 191 /* 192 * IP statistics are stored in the "array" of counter(9)s. 193 */ 194 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 195 VNET_PCPUSTAT_SYSINIT(ipstat); 196 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 197 "IP statistics (struct ipstat, netinet/ip_var.h)"); 198 199 #ifdef VIMAGE 200 VNET_PCPUSTAT_SYSUNINIT(ipstat); 201 #endif /* VIMAGE */ 202 203 /* 204 * Kernel module interface for updating ipstat. The argument is an index 205 * into ipstat treated as an array. 206 */ 207 void 208 kmod_ipstat_inc(int statnum) 209 { 210 211 counter_u64_add(VNET(ipstat)[statnum], 1); 212 } 213 214 void 215 kmod_ipstat_dec(int statnum) 216 { 217 218 counter_u64_add(VNET(ipstat)[statnum], -1); 219 } 220 221 static int 222 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 223 { 224 int error, qlimit; 225 226 netisr_getqlimit(&ip_nh, &qlimit); 227 error = sysctl_handle_int(oidp, &qlimit, 0, req); 228 if (error || !req->newptr) 229 return (error); 230 if (qlimit < 1) 231 return (EINVAL); 232 return (netisr_setqlimit(&ip_nh, qlimit)); 233 } 234 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 235 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I", 236 "Maximum size of the IP input queue"); 237 238 static int 239 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 240 { 241 u_int64_t qdrops_long; 242 int error, qdrops; 243 244 netisr_getqdrops(&ip_nh, &qdrops_long); 245 qdrops = qdrops_long; 246 error = sysctl_handle_int(oidp, &qdrops, 0, req); 247 if (error || !req->newptr) 248 return (error); 249 if (qdrops != 0) 250 return (EINVAL); 251 netisr_clearqdrops(&ip_nh); 252 return (0); 253 } 254 255 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 256 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I", 257 "Number of packets dropped from the IP input queue"); 258 259 #ifdef RSS 260 static int 261 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 262 { 263 int error, qlimit; 264 265 netisr_getqlimit(&ip_direct_nh, &qlimit); 266 error = sysctl_handle_int(oidp, &qlimit, 0, req); 267 if (error || !req->newptr) 268 return (error); 269 if (qlimit < 1) 270 return (EINVAL); 271 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 272 } 273 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_direct_queue_maxlen, 274 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_direct_queue_maxlen, "I", 275 "Maximum size of the IP direct input queue"); 276 277 static int 278 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 279 { 280 u_int64_t qdrops_long; 281 int error, qdrops; 282 283 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 284 qdrops = qdrops_long; 285 error = sysctl_handle_int(oidp, &qdrops, 0, req); 286 if (error || !req->newptr) 287 return (error); 288 if (qdrops != 0) 289 return (EINVAL); 290 netisr_clearqdrops(&ip_direct_nh); 291 return (0); 292 } 293 294 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_direct_queue_drops, 295 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_direct_queue_drops, "I", 296 "Number of packets dropped from the IP direct input queue"); 297 #endif /* RSS */ 298 299 /* 300 * IP initialization: fill in IP protocol switch table. 301 * All protocols not implemented in kernel go to raw IP protocol handler. 302 */ 303 void 304 ip_init(void) 305 { 306 struct protosw *pr; 307 int i; 308 309 TAILQ_INIT(&V_in_ifaddrhead); 310 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 311 312 /* Initialize IP reassembly queue. */ 313 ipreass_init(); 314 315 /* Initialize packet filter hooks. */ 316 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF; 317 V_inet_pfil_hook.ph_af = AF_INET; 318 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0) 319 printf("%s: WARNING: unable to register pfil hook, " 320 "error %d\n", __func__, i); 321 322 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 323 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 324 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 325 printf("%s: WARNING: unable to register input helper hook\n", 326 __func__); 327 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 328 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 329 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 330 printf("%s: WARNING: unable to register output helper hook\n", 331 __func__); 332 333 /* Skip initialization of globals for non-default instances. */ 334 if (!IS_DEFAULT_VNET(curvnet)) 335 return; 336 337 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 338 if (pr == NULL) 339 panic("ip_init: PF_INET not found"); 340 341 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */ 342 for (i = 0; i < IPPROTO_MAX; i++) 343 ip_protox[i] = pr - inetsw; 344 /* 345 * Cycle through IP protocols and put them into the appropriate place 346 * in ip_protox[]. 347 */ 348 for (pr = inetdomain.dom_protosw; 349 pr < inetdomain.dom_protoswNPROTOSW; pr++) 350 if (pr->pr_domain->dom_family == PF_INET && 351 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 352 /* Be careful to only index valid IP protocols. */ 353 if (pr->pr_protocol < IPPROTO_MAX) 354 ip_protox[pr->pr_protocol] = pr - inetsw; 355 } 356 357 netisr_register(&ip_nh); 358 #ifdef RSS 359 netisr_register(&ip_direct_nh); 360 #endif 361 } 362 363 #ifdef VIMAGE 364 void 365 ip_destroy(void) 366 { 367 int error; 368 369 if ((error = pfil_head_unregister(&V_inet_pfil_hook)) != 0) 370 printf("%s: WARNING: unable to unregister pfil hook, " 371 "error %d\n", __func__, error); 372 373 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 374 if (error != 0) { 375 printf("%s: WARNING: unable to deregister input helper hook " 376 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 377 "error %d returned\n", __func__, error); 378 } 379 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 380 if (error != 0) { 381 printf("%s: WARNING: unable to deregister output helper hook " 382 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 383 "error %d returned\n", __func__, error); 384 } 385 /* Cleanup in_ifaddr hash table; should be empty. */ 386 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 387 388 /* Destroy IP reassembly queue. */ 389 ipreass_destroy(); 390 } 391 #endif 392 393 #ifdef RSS 394 /* 395 * IP direct input routine. 396 * 397 * This is called when reinjecting completed fragments where 398 * all of the previous checking and book-keeping has been done. 399 */ 400 void 401 ip_direct_input(struct mbuf *m) 402 { 403 struct ip *ip; 404 int hlen; 405 406 ip = mtod(m, struct ip *); 407 hlen = ip->ip_hl << 2; 408 409 IPSTAT_INC(ips_delivered); 410 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 411 return; 412 } 413 #endif 414 415 /* 416 * Ip input routine. Checksum and byte swap header. If fragmented 417 * try to reassemble. Process options. Pass to next level. 418 */ 419 void 420 ip_input(struct mbuf *m) 421 { 422 struct ip *ip = NULL; 423 struct in_ifaddr *ia = NULL; 424 struct ifaddr *ifa; 425 struct ifnet *ifp; 426 int checkif, hlen = 0; 427 uint16_t sum, ip_len; 428 int dchg = 0; /* dest changed after fw */ 429 struct in_addr odst; /* original dst address */ 430 431 M_ASSERTPKTHDR(m); 432 433 if (m->m_flags & M_FASTFWD_OURS) { 434 m->m_flags &= ~M_FASTFWD_OURS; 435 /* Set up some basics that will be used later. */ 436 ip = mtod(m, struct ip *); 437 hlen = ip->ip_hl << 2; 438 ip_len = ntohs(ip->ip_len); 439 goto ours; 440 } 441 442 IPSTAT_INC(ips_total); 443 444 if (m->m_pkthdr.len < sizeof(struct ip)) 445 goto tooshort; 446 447 if (m->m_len < sizeof (struct ip) && 448 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 449 IPSTAT_INC(ips_toosmall); 450 return; 451 } 452 ip = mtod(m, struct ip *); 453 454 if (ip->ip_v != IPVERSION) { 455 IPSTAT_INC(ips_badvers); 456 goto bad; 457 } 458 459 hlen = ip->ip_hl << 2; 460 if (hlen < sizeof(struct ip)) { /* minimum header length */ 461 IPSTAT_INC(ips_badhlen); 462 goto bad; 463 } 464 if (hlen > m->m_len) { 465 if ((m = m_pullup(m, hlen)) == NULL) { 466 IPSTAT_INC(ips_badhlen); 467 return; 468 } 469 ip = mtod(m, struct ip *); 470 } 471 472 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 473 474 /* 127/8 must not appear on wire - RFC1122 */ 475 ifp = m->m_pkthdr.rcvif; 476 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 477 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 478 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 479 IPSTAT_INC(ips_badaddr); 480 goto bad; 481 } 482 } 483 484 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 485 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 486 } else { 487 if (hlen == sizeof(struct ip)) { 488 sum = in_cksum_hdr(ip); 489 } else { 490 sum = in_cksum(m, hlen); 491 } 492 } 493 if (sum) { 494 IPSTAT_INC(ips_badsum); 495 goto bad; 496 } 497 498 #ifdef ALTQ 499 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) 500 /* packet is dropped by traffic conditioner */ 501 return; 502 #endif 503 504 ip_len = ntohs(ip->ip_len); 505 if (ip_len < hlen) { 506 IPSTAT_INC(ips_badlen); 507 goto bad; 508 } 509 510 /* 511 * Check that the amount of data in the buffers 512 * is as at least much as the IP header would have us expect. 513 * Trim mbufs if longer than we expect. 514 * Drop packet if shorter than we expect. 515 */ 516 if (m->m_pkthdr.len < ip_len) { 517 tooshort: 518 IPSTAT_INC(ips_tooshort); 519 goto bad; 520 } 521 if (m->m_pkthdr.len > ip_len) { 522 if (m->m_len == m->m_pkthdr.len) { 523 m->m_len = ip_len; 524 m->m_pkthdr.len = ip_len; 525 } else 526 m_adj(m, ip_len - m->m_pkthdr.len); 527 } 528 529 /* Try to forward the packet, but if we fail continue */ 530 #ifdef IPSEC 531 /* For now we do not handle IPSEC in tryforward. */ 532 if (!key_havesp(IPSEC_DIR_INBOUND) && !key_havesp(IPSEC_DIR_OUTBOUND) && 533 (V_ipforwarding == 1)) 534 if (ip_tryforward(m) == NULL) 535 return; 536 /* 537 * Bypass packet filtering for packets previously handled by IPsec. 538 */ 539 if (ip_ipsec_filtertunnel(m)) 540 goto passin; 541 #else 542 if (V_ipforwarding == 1) 543 if (ip_tryforward(m) == NULL) 544 return; 545 #endif /* IPSEC */ 546 547 /* 548 * Run through list of hooks for input packets. 549 * 550 * NB: Beware of the destination address changing (e.g. 551 * by NAT rewriting). When this happens, tell 552 * ip_forward to do the right thing. 553 */ 554 555 /* Jump over all PFIL processing if hooks are not active. */ 556 if (!PFIL_HOOKED(&V_inet_pfil_hook)) 557 goto passin; 558 559 odst = ip->ip_dst; 560 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0) 561 return; 562 if (m == NULL) /* consumed by filter */ 563 return; 564 565 ip = mtod(m, struct ip *); 566 dchg = (odst.s_addr != ip->ip_dst.s_addr); 567 ifp = m->m_pkthdr.rcvif; 568 569 if (m->m_flags & M_FASTFWD_OURS) { 570 m->m_flags &= ~M_FASTFWD_OURS; 571 goto ours; 572 } 573 if (m->m_flags & M_IP_NEXTHOP) { 574 dchg = (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL); 575 if (dchg != 0) { 576 /* 577 * Directly ship the packet on. This allows 578 * forwarding packets originally destined to us 579 * to some other directly connected host. 580 */ 581 ip_forward(m, 1); 582 return; 583 } 584 } 585 passin: 586 587 /* 588 * Process options and, if not destined for us, 589 * ship it on. ip_dooptions returns 1 when an 590 * error was detected (causing an icmp message 591 * to be sent and the original packet to be freed). 592 */ 593 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 594 return; 595 596 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 597 * matter if it is destined to another node, or whether it is 598 * a multicast one, RSVP wants it! and prevents it from being forwarded 599 * anywhere else. Also checks if the rsvp daemon is running before 600 * grabbing the packet. 601 */ 602 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP) 603 goto ours; 604 605 /* 606 * Check our list of addresses, to see if the packet is for us. 607 * If we don't have any addresses, assume any unicast packet 608 * we receive might be for us (and let the upper layers deal 609 * with it). 610 */ 611 if (TAILQ_EMPTY(&V_in_ifaddrhead) && 612 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 613 goto ours; 614 615 /* 616 * Enable a consistency check between the destination address 617 * and the arrival interface for a unicast packet (the RFC 1122 618 * strong ES model) if IP forwarding is disabled and the packet 619 * is not locally generated and the packet is not subject to 620 * 'ipfw fwd'. 621 * 622 * XXX - Checking also should be disabled if the destination 623 * address is ipnat'ed to a different interface. 624 * 625 * XXX - Checking is incompatible with IP aliases added 626 * to the loopback interface instead of the interface where 627 * the packets are received. 628 * 629 * XXX - This is the case for carp vhost IPs as well so we 630 * insert a workaround. If the packet got here, we already 631 * checked with carp_iamatch() and carp_forus(). 632 */ 633 checkif = V_ip_checkinterface && (V_ipforwarding == 0) && 634 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) && 635 ifp->if_carp == NULL && (dchg == 0); 636 637 /* 638 * Check for exact addresses in the hash bucket. 639 */ 640 /* IN_IFADDR_RLOCK(); */ 641 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 642 /* 643 * If the address matches, verify that the packet 644 * arrived via the correct interface if checking is 645 * enabled. 646 */ 647 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr && 648 (!checkif || ia->ia_ifp == ifp)) { 649 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 650 counter_u64_add(ia->ia_ifa.ifa_ibytes, 651 m->m_pkthdr.len); 652 /* IN_IFADDR_RUNLOCK(); */ 653 goto ours; 654 } 655 } 656 /* IN_IFADDR_RUNLOCK(); */ 657 658 /* 659 * Check for broadcast addresses. 660 * 661 * Only accept broadcast packets that arrive via the matching 662 * interface. Reception of forwarded directed broadcasts would 663 * be handled via ip_forward() and ether_output() with the loopback 664 * into the stack for SIMPLEX interfaces handled by ether_output(). 665 */ 666 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) { 667 IF_ADDR_RLOCK(ifp); 668 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 669 if (ifa->ifa_addr->sa_family != AF_INET) 670 continue; 671 ia = ifatoia(ifa); 672 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 673 ip->ip_dst.s_addr) { 674 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 675 counter_u64_add(ia->ia_ifa.ifa_ibytes, 676 m->m_pkthdr.len); 677 IF_ADDR_RUNLOCK(ifp); 678 goto ours; 679 } 680 #ifdef BOOTP_COMPAT 681 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 682 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 683 counter_u64_add(ia->ia_ifa.ifa_ibytes, 684 m->m_pkthdr.len); 685 IF_ADDR_RUNLOCK(ifp); 686 goto ours; 687 } 688 #endif 689 } 690 IF_ADDR_RUNLOCK(ifp); 691 ia = NULL; 692 } 693 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */ 694 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) { 695 IPSTAT_INC(ips_cantforward); 696 m_freem(m); 697 return; 698 } 699 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 700 if (V_ip_mrouter) { 701 /* 702 * If we are acting as a multicast router, all 703 * incoming multicast packets are passed to the 704 * kernel-level multicast forwarding function. 705 * The packet is returned (relatively) intact; if 706 * ip_mforward() returns a non-zero value, the packet 707 * must be discarded, else it may be accepted below. 708 */ 709 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 710 IPSTAT_INC(ips_cantforward); 711 m_freem(m); 712 return; 713 } 714 715 /* 716 * The process-level routing daemon needs to receive 717 * all multicast IGMP packets, whether or not this 718 * host belongs to their destination groups. 719 */ 720 if (ip->ip_p == IPPROTO_IGMP) 721 goto ours; 722 IPSTAT_INC(ips_forward); 723 } 724 /* 725 * Assume the packet is for us, to avoid prematurely taking 726 * a lock on the in_multi hash. Protocols must perform 727 * their own filtering and update statistics accordingly. 728 */ 729 goto ours; 730 } 731 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 732 goto ours; 733 if (ip->ip_dst.s_addr == INADDR_ANY) 734 goto ours; 735 736 /* 737 * Not for us; forward if possible and desirable. 738 */ 739 if (V_ipforwarding == 0) { 740 IPSTAT_INC(ips_cantforward); 741 m_freem(m); 742 } else { 743 ip_forward(m, dchg); 744 } 745 return; 746 747 ours: 748 #ifdef IPSTEALTH 749 /* 750 * IPSTEALTH: Process non-routing options only 751 * if the packet is destined for us. 752 */ 753 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 754 return; 755 #endif /* IPSTEALTH */ 756 757 /* 758 * Attempt reassembly; if it succeeds, proceed. 759 * ip_reass() will return a different mbuf. 760 */ 761 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 762 /* XXXGL: shouldn't we save & set m_flags? */ 763 m = ip_reass(m); 764 if (m == NULL) 765 return; 766 ip = mtod(m, struct ip *); 767 /* Get the header length of the reassembled packet */ 768 hlen = ip->ip_hl << 2; 769 } 770 771 #ifdef IPSEC 772 /* 773 * enforce IPsec policy checking if we are seeing last header. 774 * note that we do not visit this with protocols with pcb layer 775 * code - like udp/tcp/raw ip. 776 */ 777 if (ip_ipsec_input(m, ip->ip_p) != 0) 778 goto bad; 779 #endif /* IPSEC */ 780 781 /* 782 * Switch out to protocol's input routine. 783 */ 784 IPSTAT_INC(ips_delivered); 785 786 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 787 return; 788 bad: 789 m_freem(m); 790 } 791 792 /* 793 * IP timer processing; 794 * if a timer expires on a reassembly 795 * queue, discard it. 796 */ 797 void 798 ip_slowtimo(void) 799 { 800 VNET_ITERATOR_DECL(vnet_iter); 801 802 VNET_LIST_RLOCK_NOSLEEP(); 803 VNET_FOREACH(vnet_iter) { 804 CURVNET_SET(vnet_iter); 805 ipreass_slowtimo(); 806 CURVNET_RESTORE(); 807 } 808 VNET_LIST_RUNLOCK_NOSLEEP(); 809 } 810 811 void 812 ip_drain(void) 813 { 814 VNET_ITERATOR_DECL(vnet_iter); 815 816 VNET_LIST_RLOCK_NOSLEEP(); 817 VNET_FOREACH(vnet_iter) { 818 CURVNET_SET(vnet_iter); 819 ipreass_drain(); 820 CURVNET_RESTORE(); 821 } 822 VNET_LIST_RUNLOCK_NOSLEEP(); 823 } 824 825 /* 826 * The protocol to be inserted into ip_protox[] must be already registered 827 * in inetsw[], either statically or through pf_proto_register(). 828 */ 829 int 830 ipproto_register(short ipproto) 831 { 832 struct protosw *pr; 833 834 /* Sanity checks. */ 835 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 836 return (EPROTONOSUPPORT); 837 838 /* 839 * The protocol slot must not be occupied by another protocol 840 * already. An index pointing to IPPROTO_RAW is unused. 841 */ 842 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 843 if (pr == NULL) 844 return (EPFNOSUPPORT); 845 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 846 return (EEXIST); 847 848 /* Find the protocol position in inetsw[] and set the index. */ 849 for (pr = inetdomain.dom_protosw; 850 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 851 if (pr->pr_domain->dom_family == PF_INET && 852 pr->pr_protocol && pr->pr_protocol == ipproto) { 853 ip_protox[pr->pr_protocol] = pr - inetsw; 854 return (0); 855 } 856 } 857 return (EPROTONOSUPPORT); 858 } 859 860 int 861 ipproto_unregister(short ipproto) 862 { 863 struct protosw *pr; 864 865 /* Sanity checks. */ 866 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 867 return (EPROTONOSUPPORT); 868 869 /* Check if the protocol was indeed registered. */ 870 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 871 if (pr == NULL) 872 return (EPFNOSUPPORT); 873 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 874 return (ENOENT); 875 876 /* Reset the protocol slot to IPPROTO_RAW. */ 877 ip_protox[ipproto] = pr - inetsw; 878 return (0); 879 } 880 881 u_char inetctlerrmap[PRC_NCMDS] = { 882 0, 0, 0, 0, 883 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 884 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 885 EMSGSIZE, EHOSTUNREACH, 0, 0, 886 0, 0, EHOSTUNREACH, 0, 887 ENOPROTOOPT, ECONNREFUSED 888 }; 889 890 /* 891 * Forward a packet. If some error occurs return the sender 892 * an icmp packet. Note we can't always generate a meaningful 893 * icmp message because icmp doesn't have a large enough repertoire 894 * of codes and types. 895 * 896 * If not forwarding, just drop the packet. This could be confusing 897 * if ipforwarding was zero but some routing protocol was advancing 898 * us as a gateway to somewhere. However, we must let the routing 899 * protocol deal with that. 900 * 901 * The srcrt parameter indicates whether the packet is being forwarded 902 * via a source route. 903 */ 904 void 905 ip_forward(struct mbuf *m, int srcrt) 906 { 907 struct ip *ip = mtod(m, struct ip *); 908 struct in_ifaddr *ia; 909 struct mbuf *mcopy; 910 struct sockaddr_in *sin; 911 struct in_addr dest; 912 struct route ro; 913 int error, type = 0, code = 0, mtu = 0; 914 915 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 916 IPSTAT_INC(ips_cantforward); 917 m_freem(m); 918 return; 919 } 920 #ifdef IPSEC 921 if (ip_ipsec_fwd(m) != 0) { 922 IPSTAT_INC(ips_cantforward); 923 m_freem(m); 924 return; 925 } 926 #endif /* IPSEC */ 927 #ifdef IPSTEALTH 928 if (!V_ipstealth) { 929 #endif 930 if (ip->ip_ttl <= IPTTLDEC) { 931 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 932 0, 0); 933 return; 934 } 935 #ifdef IPSTEALTH 936 } 937 #endif 938 939 bzero(&ro, sizeof(ro)); 940 sin = (struct sockaddr_in *)&ro.ro_dst; 941 sin->sin_family = AF_INET; 942 sin->sin_len = sizeof(*sin); 943 sin->sin_addr = ip->ip_dst; 944 #ifdef RADIX_MPATH 945 rtalloc_mpath_fib(&ro, 946 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 947 M_GETFIB(m)); 948 #else 949 in_rtalloc_ign(&ro, 0, M_GETFIB(m)); 950 #endif 951 if (ro.ro_rt != NULL) { 952 ia = ifatoia(ro.ro_rt->rt_ifa); 953 ifa_ref(&ia->ia_ifa); 954 } else 955 ia = NULL; 956 #ifndef IPSEC 957 /* 958 * 'ia' may be NULL if there is no route for this destination. 959 * In case of IPsec, Don't discard it just yet, but pass it to 960 * ip_output in case of outgoing IPsec policy. 961 */ 962 if (!srcrt && ia == NULL) { 963 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 964 RO_RTFREE(&ro); 965 return; 966 } 967 #endif 968 969 /* 970 * Save the IP header and at most 8 bytes of the payload, 971 * in case we need to generate an ICMP message to the src. 972 * 973 * XXX this can be optimized a lot by saving the data in a local 974 * buffer on the stack (72 bytes at most), and only allocating the 975 * mbuf if really necessary. The vast majority of the packets 976 * are forwarded without having to send an ICMP back (either 977 * because unnecessary, or because rate limited), so we are 978 * really we are wasting a lot of work here. 979 * 980 * We don't use m_copy() because it might return a reference 981 * to a shared cluster. Both this function and ip_output() 982 * assume exclusive access to the IP header in `m', so any 983 * data in a cluster may change before we reach icmp_error(). 984 */ 985 mcopy = m_gethdr(M_NOWAIT, m->m_type); 986 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 987 /* 988 * It's probably ok if the pkthdr dup fails (because 989 * the deep copy of the tag chain failed), but for now 990 * be conservative and just discard the copy since 991 * code below may some day want the tags. 992 */ 993 m_free(mcopy); 994 mcopy = NULL; 995 } 996 if (mcopy != NULL) { 997 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 998 mcopy->m_pkthdr.len = mcopy->m_len; 999 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1000 } 1001 1002 #ifdef IPSTEALTH 1003 if (!V_ipstealth) { 1004 #endif 1005 ip->ip_ttl -= IPTTLDEC; 1006 #ifdef IPSTEALTH 1007 } 1008 #endif 1009 1010 /* 1011 * If forwarding packet using same interface that it came in on, 1012 * perhaps should send a redirect to sender to shortcut a hop. 1013 * Only send redirect if source is sending directly to us, 1014 * and if packet was not source routed (or has any options). 1015 * Also, don't send redirect if forwarding using a default route 1016 * or a route modified by a redirect. 1017 */ 1018 dest.s_addr = 0; 1019 if (!srcrt && V_ipsendredirects && 1020 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1021 struct rtentry *rt; 1022 1023 rt = ro.ro_rt; 1024 1025 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1026 satosin(rt_key(rt))->sin_addr.s_addr != 0) { 1027 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1028 u_long src = ntohl(ip->ip_src.s_addr); 1029 1030 if (RTA(rt) && 1031 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 1032 if (rt->rt_flags & RTF_GATEWAY) 1033 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr; 1034 else 1035 dest.s_addr = ip->ip_dst.s_addr; 1036 /* Router requirements says to only send host redirects */ 1037 type = ICMP_REDIRECT; 1038 code = ICMP_REDIRECT_HOST; 1039 } 1040 } 1041 } 1042 1043 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1044 1045 if (error == EMSGSIZE && ro.ro_rt) 1046 mtu = ro.ro_rt->rt_mtu; 1047 RO_RTFREE(&ro); 1048 1049 if (error) 1050 IPSTAT_INC(ips_cantforward); 1051 else { 1052 IPSTAT_INC(ips_forward); 1053 if (type) 1054 IPSTAT_INC(ips_redirectsent); 1055 else { 1056 if (mcopy) 1057 m_freem(mcopy); 1058 if (ia != NULL) 1059 ifa_free(&ia->ia_ifa); 1060 return; 1061 } 1062 } 1063 if (mcopy == NULL) { 1064 if (ia != NULL) 1065 ifa_free(&ia->ia_ifa); 1066 return; 1067 } 1068 1069 switch (error) { 1070 1071 case 0: /* forwarded, but need redirect */ 1072 /* type, code set above */ 1073 break; 1074 1075 case ENETUNREACH: 1076 case EHOSTUNREACH: 1077 case ENETDOWN: 1078 case EHOSTDOWN: 1079 default: 1080 type = ICMP_UNREACH; 1081 code = ICMP_UNREACH_HOST; 1082 break; 1083 1084 case EMSGSIZE: 1085 type = ICMP_UNREACH; 1086 code = ICMP_UNREACH_NEEDFRAG; 1087 1088 #ifdef IPSEC 1089 /* 1090 * If IPsec is configured for this path, 1091 * override any possibly mtu value set by ip_output. 1092 */ 1093 mtu = ip_ipsec_mtu(mcopy, mtu); 1094 #endif /* IPSEC */ 1095 /* 1096 * If the MTU was set before make sure we are below the 1097 * interface MTU. 1098 * If the MTU wasn't set before use the interface mtu or 1099 * fall back to the next smaller mtu step compared to the 1100 * current packet size. 1101 */ 1102 if (mtu != 0) { 1103 if (ia != NULL) 1104 mtu = min(mtu, ia->ia_ifp->if_mtu); 1105 } else { 1106 if (ia != NULL) 1107 mtu = ia->ia_ifp->if_mtu; 1108 else 1109 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1110 } 1111 IPSTAT_INC(ips_cantfrag); 1112 break; 1113 1114 case ENOBUFS: 1115 case EACCES: /* ipfw denied packet */ 1116 m_freem(mcopy); 1117 if (ia != NULL) 1118 ifa_free(&ia->ia_ifa); 1119 return; 1120 } 1121 if (ia != NULL) 1122 ifa_free(&ia->ia_ifa); 1123 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1124 } 1125 1126 void 1127 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1128 struct mbuf *m) 1129 { 1130 1131 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) { 1132 struct bintime bt; 1133 1134 bintime(&bt); 1135 if (inp->inp_socket->so_options & SO_BINTIME) { 1136 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1137 SCM_BINTIME, SOL_SOCKET); 1138 if (*mp) 1139 mp = &(*mp)->m_next; 1140 } 1141 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1142 struct timeval tv; 1143 1144 bintime2timeval(&bt, &tv); 1145 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1146 SCM_TIMESTAMP, SOL_SOCKET); 1147 if (*mp) 1148 mp = &(*mp)->m_next; 1149 } 1150 } 1151 if (inp->inp_flags & INP_RECVDSTADDR) { 1152 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1153 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1154 if (*mp) 1155 mp = &(*mp)->m_next; 1156 } 1157 if (inp->inp_flags & INP_RECVTTL) { 1158 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1159 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1160 if (*mp) 1161 mp = &(*mp)->m_next; 1162 } 1163 #ifdef notyet 1164 /* XXX 1165 * Moving these out of udp_input() made them even more broken 1166 * than they already were. 1167 */ 1168 /* options were tossed already */ 1169 if (inp->inp_flags & INP_RECVOPTS) { 1170 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1171 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1172 if (*mp) 1173 mp = &(*mp)->m_next; 1174 } 1175 /* ip_srcroute doesn't do what we want here, need to fix */ 1176 if (inp->inp_flags & INP_RECVRETOPTS) { 1177 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1178 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1179 if (*mp) 1180 mp = &(*mp)->m_next; 1181 } 1182 #endif 1183 if (inp->inp_flags & INP_RECVIF) { 1184 struct ifnet *ifp; 1185 struct sdlbuf { 1186 struct sockaddr_dl sdl; 1187 u_char pad[32]; 1188 } sdlbuf; 1189 struct sockaddr_dl *sdp; 1190 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1191 1192 if ((ifp = m->m_pkthdr.rcvif) && 1193 ifp->if_index && ifp->if_index <= V_if_index) { 1194 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1195 /* 1196 * Change our mind and don't try copy. 1197 */ 1198 if (sdp->sdl_family != AF_LINK || 1199 sdp->sdl_len > sizeof(sdlbuf)) { 1200 goto makedummy; 1201 } 1202 bcopy(sdp, sdl2, sdp->sdl_len); 1203 } else { 1204 makedummy: 1205 sdl2->sdl_len = 1206 offsetof(struct sockaddr_dl, sdl_data[0]); 1207 sdl2->sdl_family = AF_LINK; 1208 sdl2->sdl_index = 0; 1209 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1210 } 1211 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1212 IP_RECVIF, IPPROTO_IP); 1213 if (*mp) 1214 mp = &(*mp)->m_next; 1215 } 1216 if (inp->inp_flags & INP_RECVTOS) { 1217 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1218 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1219 if (*mp) 1220 mp = &(*mp)->m_next; 1221 } 1222 1223 if (inp->inp_flags2 & INP_RECVFLOWID) { 1224 uint32_t flowid, flow_type; 1225 1226 flowid = m->m_pkthdr.flowid; 1227 flow_type = M_HASHTYPE_GET(m); 1228 1229 /* 1230 * XXX should handle the failure of one or the 1231 * other - don't populate both? 1232 */ 1233 *mp = sbcreatecontrol((caddr_t) &flowid, 1234 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1235 if (*mp) 1236 mp = &(*mp)->m_next; 1237 *mp = sbcreatecontrol((caddr_t) &flow_type, 1238 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1239 if (*mp) 1240 mp = &(*mp)->m_next; 1241 } 1242 1243 #ifdef RSS 1244 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1245 uint32_t flowid, flow_type; 1246 uint32_t rss_bucketid; 1247 1248 flowid = m->m_pkthdr.flowid; 1249 flow_type = M_HASHTYPE_GET(m); 1250 1251 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1252 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1253 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1254 if (*mp) 1255 mp = &(*mp)->m_next; 1256 } 1257 } 1258 #endif 1259 } 1260 1261 /* 1262 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1263 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1264 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1265 * compiled. 1266 */ 1267 static VNET_DEFINE(int, ip_rsvp_on); 1268 VNET_DEFINE(struct socket *, ip_rsvpd); 1269 1270 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1271 1272 int 1273 ip_rsvp_init(struct socket *so) 1274 { 1275 1276 if (so->so_type != SOCK_RAW || 1277 so->so_proto->pr_protocol != IPPROTO_RSVP) 1278 return EOPNOTSUPP; 1279 1280 if (V_ip_rsvpd != NULL) 1281 return EADDRINUSE; 1282 1283 V_ip_rsvpd = so; 1284 /* 1285 * This may seem silly, but we need to be sure we don't over-increment 1286 * the RSVP counter, in case something slips up. 1287 */ 1288 if (!V_ip_rsvp_on) { 1289 V_ip_rsvp_on = 1; 1290 V_rsvp_on++; 1291 } 1292 1293 return 0; 1294 } 1295 1296 int 1297 ip_rsvp_done(void) 1298 { 1299 1300 V_ip_rsvpd = NULL; 1301 /* 1302 * This may seem silly, but we need to be sure we don't over-decrement 1303 * the RSVP counter, in case something slips up. 1304 */ 1305 if (V_ip_rsvp_on) { 1306 V_ip_rsvp_on = 0; 1307 V_rsvp_on--; 1308 } 1309 return 0; 1310 } 1311 1312 int 1313 rsvp_input(struct mbuf **mp, int *offp, int proto) 1314 { 1315 struct mbuf *m; 1316 1317 m = *mp; 1318 *mp = NULL; 1319 1320 if (rsvp_input_p) { /* call the real one if loaded */ 1321 *mp = m; 1322 rsvp_input_p(mp, offp, proto); 1323 return (IPPROTO_DONE); 1324 } 1325 1326 /* Can still get packets with rsvp_on = 0 if there is a local member 1327 * of the group to which the RSVP packet is addressed. But in this 1328 * case we want to throw the packet away. 1329 */ 1330 1331 if (!V_rsvp_on) { 1332 m_freem(m); 1333 return (IPPROTO_DONE); 1334 } 1335 1336 if (V_ip_rsvpd != NULL) { 1337 *mp = m; 1338 rip_input(mp, offp, proto); 1339 return (IPPROTO_DONE); 1340 } 1341 /* Drop the packet */ 1342 m_freem(m); 1343 return (IPPROTO_DONE); 1344 } 1345