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 * 3. 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_ipstealth.h" 37 #include "opt_ipsec.h" 38 #include "opt_route.h" 39 #include "opt_rss.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/hhook.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/rmlock.h> 53 #include <sys/rwlock.h> 54 #include <sys/sdt.h> 55 #include <sys/syslog.h> 56 #include <sys/sysctl.h> 57 58 #include <net/pfil.h> 59 #include <net/if.h> 60 #include <net/if_types.h> 61 #include <net/if_var.h> 62 #include <net/if_dl.h> 63 #include <net/route.h> 64 #include <net/netisr.h> 65 #include <net/rss_config.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_kdtrace.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/in_var.h> 72 #include <netinet/ip.h> 73 #include <netinet/in_pcb.h> 74 #include <netinet/ip_var.h> 75 #include <netinet/ip_fw.h> 76 #include <netinet/ip_icmp.h> 77 #include <netinet/ip_options.h> 78 #include <machine/in_cksum.h> 79 #include <netinet/ip_carp.h> 80 #include <netinet/in_rss.h> 81 82 #include <netipsec/ipsec_support.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 rmlock in_ifaddr_lock; 101 RM_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_v4, 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_soft_m2cpuid_v4, 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 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 319 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 320 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 321 printf("%s: WARNING: unable to register input helper hook\n", 322 __func__); 323 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 324 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 325 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 326 printf("%s: WARNING: unable to register output helper hook\n", 327 __func__); 328 329 /* Skip initialization of globals for non-default instances. */ 330 #ifdef VIMAGE 331 if (!IS_DEFAULT_VNET(curvnet)) { 332 netisr_register_vnet(&ip_nh); 333 #ifdef RSS 334 netisr_register_vnet(&ip_direct_nh); 335 #endif 336 return; 337 } 338 #endif 339 340 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 341 if (pr == NULL) 342 panic("ip_init: PF_INET not found"); 343 344 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */ 345 for (i = 0; i < IPPROTO_MAX; i++) 346 ip_protox[i] = pr - inetsw; 347 /* 348 * Cycle through IP protocols and put them into the appropriate place 349 * in ip_protox[]. 350 */ 351 for (pr = inetdomain.dom_protosw; 352 pr < inetdomain.dom_protoswNPROTOSW; pr++) 353 if (pr->pr_domain->dom_family == PF_INET && 354 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 355 /* Be careful to only index valid IP protocols. */ 356 if (pr->pr_protocol < IPPROTO_MAX) 357 ip_protox[pr->pr_protocol] = pr - inetsw; 358 } 359 360 netisr_register(&ip_nh); 361 #ifdef RSS 362 netisr_register(&ip_direct_nh); 363 #endif 364 } 365 366 #ifdef VIMAGE 367 static void 368 ip_destroy(void *unused __unused) 369 { 370 struct ifnet *ifp; 371 int error; 372 373 #ifdef RSS 374 netisr_unregister_vnet(&ip_direct_nh); 375 #endif 376 netisr_unregister_vnet(&ip_nh); 377 378 if ((error = pfil_head_unregister(&V_inet_pfil_hook)) != 0) 379 printf("%s: WARNING: unable to unregister pfil hook, " 380 "error %d\n", __func__, error); 381 382 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 383 if (error != 0) { 384 printf("%s: WARNING: unable to deregister input helper hook " 385 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 386 "error %d returned\n", __func__, error); 387 } 388 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 389 if (error != 0) { 390 printf("%s: WARNING: unable to deregister output helper hook " 391 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 392 "error %d returned\n", __func__, error); 393 } 394 395 /* Remove the IPv4 addresses from all interfaces. */ 396 in_ifscrub_all(); 397 398 /* Make sure the IPv4 routes are gone as well. */ 399 IFNET_RLOCK(); 400 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 401 rt_flushifroutes_af(ifp, AF_INET); 402 IFNET_RUNLOCK(); 403 404 /* Destroy IP reassembly queue. */ 405 ipreass_destroy(); 406 407 /* Cleanup in_ifaddr hash table; should be empty. */ 408 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 409 } 410 411 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 412 #endif 413 414 #ifdef RSS 415 /* 416 * IP direct input routine. 417 * 418 * This is called when reinjecting completed fragments where 419 * all of the previous checking and book-keeping has been done. 420 */ 421 void 422 ip_direct_input(struct mbuf *m) 423 { 424 struct ip *ip; 425 int hlen; 426 427 ip = mtod(m, struct ip *); 428 hlen = ip->ip_hl << 2; 429 430 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 431 if (IPSEC_ENABLED(ipv4)) { 432 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 433 return; 434 } 435 #endif /* IPSEC */ 436 IPSTAT_INC(ips_delivered); 437 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 438 return; 439 } 440 #endif 441 442 /* 443 * Ip input routine. Checksum and byte swap header. If fragmented 444 * try to reassemble. Process options. Pass to next level. 445 */ 446 void 447 ip_input(struct mbuf *m) 448 { 449 struct ip *ip = NULL; 450 struct in_ifaddr *ia = NULL; 451 struct ifaddr *ifa; 452 struct ifnet *ifp; 453 int checkif, hlen = 0; 454 uint16_t sum, ip_len; 455 int dchg = 0; /* dest changed after fw */ 456 struct in_addr odst; /* original dst address */ 457 458 M_ASSERTPKTHDR(m); 459 460 if (m->m_flags & M_FASTFWD_OURS) { 461 m->m_flags &= ~M_FASTFWD_OURS; 462 /* Set up some basics that will be used later. */ 463 ip = mtod(m, struct ip *); 464 hlen = ip->ip_hl << 2; 465 ip_len = ntohs(ip->ip_len); 466 goto ours; 467 } 468 469 IPSTAT_INC(ips_total); 470 471 if (m->m_pkthdr.len < sizeof(struct ip)) 472 goto tooshort; 473 474 if (m->m_len < sizeof (struct ip) && 475 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 476 IPSTAT_INC(ips_toosmall); 477 return; 478 } 479 ip = mtod(m, struct ip *); 480 481 if (ip->ip_v != IPVERSION) { 482 IPSTAT_INC(ips_badvers); 483 goto bad; 484 } 485 486 hlen = ip->ip_hl << 2; 487 if (hlen < sizeof(struct ip)) { /* minimum header length */ 488 IPSTAT_INC(ips_badhlen); 489 goto bad; 490 } 491 if (hlen > m->m_len) { 492 if ((m = m_pullup(m, hlen)) == NULL) { 493 IPSTAT_INC(ips_badhlen); 494 return; 495 } 496 ip = mtod(m, struct ip *); 497 } 498 499 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 500 501 /* 127/8 must not appear on wire - RFC1122 */ 502 ifp = m->m_pkthdr.rcvif; 503 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 504 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 505 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 506 IPSTAT_INC(ips_badaddr); 507 goto bad; 508 } 509 } 510 511 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 512 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 513 } else { 514 if (hlen == sizeof(struct ip)) { 515 sum = in_cksum_hdr(ip); 516 } else { 517 sum = in_cksum(m, hlen); 518 } 519 } 520 if (sum) { 521 IPSTAT_INC(ips_badsum); 522 goto bad; 523 } 524 525 #ifdef ALTQ 526 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) 527 /* packet is dropped by traffic conditioner */ 528 return; 529 #endif 530 531 ip_len = ntohs(ip->ip_len); 532 if (ip_len < hlen) { 533 IPSTAT_INC(ips_badlen); 534 goto bad; 535 } 536 537 /* 538 * Check that the amount of data in the buffers 539 * is as at least much as the IP header would have us expect. 540 * Trim mbufs if longer than we expect. 541 * Drop packet if shorter than we expect. 542 */ 543 if (m->m_pkthdr.len < ip_len) { 544 tooshort: 545 IPSTAT_INC(ips_tooshort); 546 goto bad; 547 } 548 if (m->m_pkthdr.len > ip_len) { 549 if (m->m_len == m->m_pkthdr.len) { 550 m->m_len = ip_len; 551 m->m_pkthdr.len = ip_len; 552 } else 553 m_adj(m, ip_len - m->m_pkthdr.len); 554 } 555 556 /* 557 * Try to forward the packet, but if we fail continue. 558 * ip_tryforward() does inbound and outbound packet firewall 559 * processing. If firewall has decided that destination becomes 560 * our local address, it sets M_FASTFWD_OURS flag. In this 561 * case skip another inbound firewall processing and update 562 * ip pointer. 563 */ 564 if (V_ipforwarding != 0 565 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 566 && (!IPSEC_ENABLED(ipv4) || 567 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 568 #endif 569 ) { 570 if ((m = ip_tryforward(m)) == NULL) 571 return; 572 if (m->m_flags & M_FASTFWD_OURS) { 573 m->m_flags &= ~M_FASTFWD_OURS; 574 ip = mtod(m, struct ip *); 575 goto ours; 576 } 577 } 578 579 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 580 /* 581 * Bypass packet filtering for packets previously handled by IPsec. 582 */ 583 if (IPSEC_ENABLED(ipv4) && 584 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 585 goto passin; 586 #endif 587 588 /* 589 * Run through list of hooks for input packets. 590 * 591 * NB: Beware of the destination address changing (e.g. 592 * by NAT rewriting). When this happens, tell 593 * ip_forward to do the right thing. 594 */ 595 596 /* Jump over all PFIL processing if hooks are not active. */ 597 if (!PFIL_HOOKED(&V_inet_pfil_hook)) 598 goto passin; 599 600 odst = ip->ip_dst; 601 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0) 602 return; 603 if (m == NULL) /* consumed by filter */ 604 return; 605 606 ip = mtod(m, struct ip *); 607 dchg = (odst.s_addr != ip->ip_dst.s_addr); 608 ifp = m->m_pkthdr.rcvif; 609 610 if (m->m_flags & M_FASTFWD_OURS) { 611 m->m_flags &= ~M_FASTFWD_OURS; 612 goto ours; 613 } 614 if (m->m_flags & M_IP_NEXTHOP) { 615 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 616 /* 617 * Directly ship the packet on. This allows 618 * forwarding packets originally destined to us 619 * to some other directly connected host. 620 */ 621 ip_forward(m, 1); 622 return; 623 } 624 } 625 passin: 626 627 /* 628 * Process options and, if not destined for us, 629 * ship it on. ip_dooptions returns 1 when an 630 * error was detected (causing an icmp message 631 * to be sent and the original packet to be freed). 632 */ 633 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 634 return; 635 636 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 637 * matter if it is destined to another node, or whether it is 638 * a multicast one, RSVP wants it! and prevents it from being forwarded 639 * anywhere else. Also checks if the rsvp daemon is running before 640 * grabbing the packet. 641 */ 642 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP) 643 goto ours; 644 645 /* 646 * Check our list of addresses, to see if the packet is for us. 647 * If we don't have any addresses, assume any unicast packet 648 * we receive might be for us (and let the upper layers deal 649 * with it). 650 */ 651 if (TAILQ_EMPTY(&V_in_ifaddrhead) && 652 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 653 goto ours; 654 655 /* 656 * Enable a consistency check between the destination address 657 * and the arrival interface for a unicast packet (the RFC 1122 658 * strong ES model) if IP forwarding is disabled and the packet 659 * is not locally generated and the packet is not subject to 660 * 'ipfw fwd'. 661 * 662 * XXX - Checking also should be disabled if the destination 663 * address is ipnat'ed to a different interface. 664 * 665 * XXX - Checking is incompatible with IP aliases added 666 * to the loopback interface instead of the interface where 667 * the packets are received. 668 * 669 * XXX - This is the case for carp vhost IPs as well so we 670 * insert a workaround. If the packet got here, we already 671 * checked with carp_iamatch() and carp_forus(). 672 */ 673 checkif = V_ip_checkinterface && (V_ipforwarding == 0) && 674 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) && 675 ifp->if_carp == NULL && (dchg == 0); 676 677 /* 678 * Check for exact addresses in the hash bucket. 679 */ 680 /* IN_IFADDR_RLOCK(); */ 681 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 682 /* 683 * If the address matches, verify that the packet 684 * arrived via the correct interface if checking is 685 * enabled. 686 */ 687 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr && 688 (!checkif || ia->ia_ifp == ifp)) { 689 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 690 counter_u64_add(ia->ia_ifa.ifa_ibytes, 691 m->m_pkthdr.len); 692 /* IN_IFADDR_RUNLOCK(); */ 693 goto ours; 694 } 695 } 696 /* IN_IFADDR_RUNLOCK(); */ 697 698 /* 699 * Check for broadcast addresses. 700 * 701 * Only accept broadcast packets that arrive via the matching 702 * interface. Reception of forwarded directed broadcasts would 703 * be handled via ip_forward() and ether_output() with the loopback 704 * into the stack for SIMPLEX interfaces handled by ether_output(). 705 */ 706 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) { 707 IF_ADDR_RLOCK(ifp); 708 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 709 if (ifa->ifa_addr->sa_family != AF_INET) 710 continue; 711 ia = ifatoia(ifa); 712 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 713 ip->ip_dst.s_addr) { 714 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 715 counter_u64_add(ia->ia_ifa.ifa_ibytes, 716 m->m_pkthdr.len); 717 IF_ADDR_RUNLOCK(ifp); 718 goto ours; 719 } 720 #ifdef BOOTP_COMPAT 721 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 722 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 723 counter_u64_add(ia->ia_ifa.ifa_ibytes, 724 m->m_pkthdr.len); 725 IF_ADDR_RUNLOCK(ifp); 726 goto ours; 727 } 728 #endif 729 } 730 IF_ADDR_RUNLOCK(ifp); 731 ia = NULL; 732 } 733 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */ 734 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) { 735 IPSTAT_INC(ips_cantforward); 736 m_freem(m); 737 return; 738 } 739 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 740 if (V_ip_mrouter) { 741 /* 742 * If we are acting as a multicast router, all 743 * incoming multicast packets are passed to the 744 * kernel-level multicast forwarding function. 745 * The packet is returned (relatively) intact; if 746 * ip_mforward() returns a non-zero value, the packet 747 * must be discarded, else it may be accepted below. 748 */ 749 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 750 IPSTAT_INC(ips_cantforward); 751 m_freem(m); 752 return; 753 } 754 755 /* 756 * The process-level routing daemon needs to receive 757 * all multicast IGMP packets, whether or not this 758 * host belongs to their destination groups. 759 */ 760 if (ip->ip_p == IPPROTO_IGMP) 761 goto ours; 762 IPSTAT_INC(ips_forward); 763 } 764 /* 765 * Assume the packet is for us, to avoid prematurely taking 766 * a lock on the in_multi hash. Protocols must perform 767 * their own filtering and update statistics accordingly. 768 */ 769 goto ours; 770 } 771 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 772 goto ours; 773 if (ip->ip_dst.s_addr == INADDR_ANY) 774 goto ours; 775 776 /* 777 * Not for us; forward if possible and desirable. 778 */ 779 if (V_ipforwarding == 0) { 780 IPSTAT_INC(ips_cantforward); 781 m_freem(m); 782 } else { 783 ip_forward(m, dchg); 784 } 785 return; 786 787 ours: 788 #ifdef IPSTEALTH 789 /* 790 * IPSTEALTH: Process non-routing options only 791 * if the packet is destined for us. 792 */ 793 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 794 return; 795 #endif /* IPSTEALTH */ 796 797 /* 798 * Attempt reassembly; if it succeeds, proceed. 799 * ip_reass() will return a different mbuf. 800 */ 801 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 802 /* XXXGL: shouldn't we save & set m_flags? */ 803 m = ip_reass(m); 804 if (m == NULL) 805 return; 806 ip = mtod(m, struct ip *); 807 /* Get the header length of the reassembled packet */ 808 hlen = ip->ip_hl << 2; 809 } 810 811 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 812 if (IPSEC_ENABLED(ipv4)) { 813 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 814 return; 815 } 816 #endif /* IPSEC */ 817 818 /* 819 * Switch out to protocol's input routine. 820 */ 821 IPSTAT_INC(ips_delivered); 822 823 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 824 return; 825 bad: 826 m_freem(m); 827 } 828 829 /* 830 * IP timer processing; 831 * if a timer expires on a reassembly 832 * queue, discard it. 833 */ 834 void 835 ip_slowtimo(void) 836 { 837 VNET_ITERATOR_DECL(vnet_iter); 838 839 VNET_LIST_RLOCK_NOSLEEP(); 840 VNET_FOREACH(vnet_iter) { 841 CURVNET_SET(vnet_iter); 842 ipreass_slowtimo(); 843 CURVNET_RESTORE(); 844 } 845 VNET_LIST_RUNLOCK_NOSLEEP(); 846 } 847 848 void 849 ip_drain(void) 850 { 851 VNET_ITERATOR_DECL(vnet_iter); 852 853 VNET_LIST_RLOCK_NOSLEEP(); 854 VNET_FOREACH(vnet_iter) { 855 CURVNET_SET(vnet_iter); 856 ipreass_drain(); 857 CURVNET_RESTORE(); 858 } 859 VNET_LIST_RUNLOCK_NOSLEEP(); 860 } 861 862 /* 863 * The protocol to be inserted into ip_protox[] must be already registered 864 * in inetsw[], either statically or through pf_proto_register(). 865 */ 866 int 867 ipproto_register(short ipproto) 868 { 869 struct protosw *pr; 870 871 /* Sanity checks. */ 872 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 873 return (EPROTONOSUPPORT); 874 875 /* 876 * The protocol slot must not be occupied by another protocol 877 * already. An index pointing to IPPROTO_RAW is unused. 878 */ 879 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 880 if (pr == NULL) 881 return (EPFNOSUPPORT); 882 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 883 return (EEXIST); 884 885 /* Find the protocol position in inetsw[] and set the index. */ 886 for (pr = inetdomain.dom_protosw; 887 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 888 if (pr->pr_domain->dom_family == PF_INET && 889 pr->pr_protocol && pr->pr_protocol == ipproto) { 890 ip_protox[pr->pr_protocol] = pr - inetsw; 891 return (0); 892 } 893 } 894 return (EPROTONOSUPPORT); 895 } 896 897 int 898 ipproto_unregister(short ipproto) 899 { 900 struct protosw *pr; 901 902 /* Sanity checks. */ 903 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 904 return (EPROTONOSUPPORT); 905 906 /* Check if the protocol was indeed registered. */ 907 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 908 if (pr == NULL) 909 return (EPFNOSUPPORT); 910 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 911 return (ENOENT); 912 913 /* Reset the protocol slot to IPPROTO_RAW. */ 914 ip_protox[ipproto] = pr - inetsw; 915 return (0); 916 } 917 918 u_char inetctlerrmap[PRC_NCMDS] = { 919 0, 0, 0, 0, 920 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 921 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 922 EMSGSIZE, EHOSTUNREACH, 0, 0, 923 0, 0, EHOSTUNREACH, 0, 924 ENOPROTOOPT, ECONNREFUSED 925 }; 926 927 /* 928 * Forward a packet. If some error occurs return the sender 929 * an icmp packet. Note we can't always generate a meaningful 930 * icmp message because icmp doesn't have a large enough repertoire 931 * of codes and types. 932 * 933 * If not forwarding, just drop the packet. This could be confusing 934 * if ipforwarding was zero but some routing protocol was advancing 935 * us as a gateway to somewhere. However, we must let the routing 936 * protocol deal with that. 937 * 938 * The srcrt parameter indicates whether the packet is being forwarded 939 * via a source route. 940 */ 941 void 942 ip_forward(struct mbuf *m, int srcrt) 943 { 944 struct ip *ip = mtod(m, struct ip *); 945 struct in_ifaddr *ia; 946 struct mbuf *mcopy; 947 struct sockaddr_in *sin; 948 struct in_addr dest; 949 struct route ro; 950 int error, type = 0, code = 0, mtu = 0; 951 952 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 953 IPSTAT_INC(ips_cantforward); 954 m_freem(m); 955 return; 956 } 957 if ( 958 #ifdef IPSTEALTH 959 V_ipstealth == 0 && 960 #endif 961 ip->ip_ttl <= IPTTLDEC) { 962 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 963 return; 964 } 965 966 bzero(&ro, sizeof(ro)); 967 sin = (struct sockaddr_in *)&ro.ro_dst; 968 sin->sin_family = AF_INET; 969 sin->sin_len = sizeof(*sin); 970 sin->sin_addr = ip->ip_dst; 971 #ifdef RADIX_MPATH 972 rtalloc_mpath_fib(&ro, 973 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 974 M_GETFIB(m)); 975 #else 976 in_rtalloc_ign(&ro, 0, M_GETFIB(m)); 977 #endif 978 if (ro.ro_rt != NULL) { 979 ia = ifatoia(ro.ro_rt->rt_ifa); 980 ifa_ref(&ia->ia_ifa); 981 } else 982 ia = NULL; 983 /* 984 * Save the IP header and at most 8 bytes of the payload, 985 * in case we need to generate an ICMP message to the src. 986 * 987 * XXX this can be optimized a lot by saving the data in a local 988 * buffer on the stack (72 bytes at most), and only allocating the 989 * mbuf if really necessary. The vast majority of the packets 990 * are forwarded without having to send an ICMP back (either 991 * because unnecessary, or because rate limited), so we are 992 * really we are wasting a lot of work here. 993 * 994 * We don't use m_copym() because it might return a reference 995 * to a shared cluster. Both this function and ip_output() 996 * assume exclusive access to the IP header in `m', so any 997 * data in a cluster may change before we reach icmp_error(). 998 */ 999 mcopy = m_gethdr(M_NOWAIT, m->m_type); 1000 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 1001 /* 1002 * It's probably ok if the pkthdr dup fails (because 1003 * the deep copy of the tag chain failed), but for now 1004 * be conservative and just discard the copy since 1005 * code below may some day want the tags. 1006 */ 1007 m_free(mcopy); 1008 mcopy = NULL; 1009 } 1010 if (mcopy != NULL) { 1011 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1012 mcopy->m_pkthdr.len = mcopy->m_len; 1013 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1014 } 1015 #ifdef IPSTEALTH 1016 if (V_ipstealth == 0) 1017 #endif 1018 ip->ip_ttl -= IPTTLDEC; 1019 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1020 if (IPSEC_ENABLED(ipv4)) { 1021 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1022 /* mbuf consumed by IPsec */ 1023 m_freem(mcopy); 1024 if (error != EINPROGRESS) 1025 IPSTAT_INC(ips_cantforward); 1026 return; 1027 } 1028 /* No IPsec processing required */ 1029 } 1030 #endif /* IPSEC */ 1031 /* 1032 * If forwarding packet using same interface that it came in on, 1033 * perhaps should send a redirect to sender to shortcut a hop. 1034 * Only send redirect if source is sending directly to us, 1035 * and if packet was not source routed (or has any options). 1036 * Also, don't send redirect if forwarding using a default route 1037 * or a route modified by a redirect. 1038 */ 1039 dest.s_addr = 0; 1040 if (!srcrt && V_ipsendredirects && 1041 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1042 struct rtentry *rt; 1043 1044 rt = ro.ro_rt; 1045 1046 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1047 satosin(rt_key(rt))->sin_addr.s_addr != 0) { 1048 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1049 u_long src = ntohl(ip->ip_src.s_addr); 1050 1051 if (RTA(rt) && 1052 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 1053 if (rt->rt_flags & RTF_GATEWAY) 1054 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr; 1055 else 1056 dest.s_addr = ip->ip_dst.s_addr; 1057 /* Router requirements says to only send host redirects */ 1058 type = ICMP_REDIRECT; 1059 code = ICMP_REDIRECT_HOST; 1060 } 1061 } 1062 } 1063 1064 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1065 1066 if (error == EMSGSIZE && ro.ro_rt) 1067 mtu = ro.ro_rt->rt_mtu; 1068 RO_RTFREE(&ro); 1069 1070 if (error) 1071 IPSTAT_INC(ips_cantforward); 1072 else { 1073 IPSTAT_INC(ips_forward); 1074 if (type) 1075 IPSTAT_INC(ips_redirectsent); 1076 else { 1077 if (mcopy) 1078 m_freem(mcopy); 1079 if (ia != NULL) 1080 ifa_free(&ia->ia_ifa); 1081 return; 1082 } 1083 } 1084 if (mcopy == NULL) { 1085 if (ia != NULL) 1086 ifa_free(&ia->ia_ifa); 1087 return; 1088 } 1089 1090 switch (error) { 1091 1092 case 0: /* forwarded, but need redirect */ 1093 /* type, code set above */ 1094 break; 1095 1096 case ENETUNREACH: 1097 case EHOSTUNREACH: 1098 case ENETDOWN: 1099 case EHOSTDOWN: 1100 default: 1101 type = ICMP_UNREACH; 1102 code = ICMP_UNREACH_HOST; 1103 break; 1104 1105 case EMSGSIZE: 1106 type = ICMP_UNREACH; 1107 code = ICMP_UNREACH_NEEDFRAG; 1108 /* 1109 * If the MTU was set before make sure we are below the 1110 * interface MTU. 1111 * If the MTU wasn't set before use the interface mtu or 1112 * fall back to the next smaller mtu step compared to the 1113 * current packet size. 1114 */ 1115 if (mtu != 0) { 1116 if (ia != NULL) 1117 mtu = min(mtu, ia->ia_ifp->if_mtu); 1118 } else { 1119 if (ia != NULL) 1120 mtu = ia->ia_ifp->if_mtu; 1121 else 1122 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1123 } 1124 IPSTAT_INC(ips_cantfrag); 1125 break; 1126 1127 case ENOBUFS: 1128 case EACCES: /* ipfw denied packet */ 1129 m_freem(mcopy); 1130 if (ia != NULL) 1131 ifa_free(&ia->ia_ifa); 1132 return; 1133 } 1134 if (ia != NULL) 1135 ifa_free(&ia->ia_ifa); 1136 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1137 } 1138 1139 #define CHECK_SO_CT(sp, ct) \ 1140 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1141 1142 void 1143 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1144 struct mbuf *m) 1145 { 1146 1147 if ((inp->inp_socket->so_options & SO_BINTIME) || 1148 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1149 struct bintime bt; 1150 1151 bintime(&bt); 1152 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1153 SCM_BINTIME, SOL_SOCKET); 1154 if (*mp) 1155 mp = &(*mp)->m_next; 1156 } 1157 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1158 struct timeval tv; 1159 1160 microtime(&tv); 1161 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1162 SCM_TIMESTAMP, SOL_SOCKET); 1163 if (*mp) 1164 mp = &(*mp)->m_next; 1165 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1166 struct timespec ts; 1167 1168 nanotime(&ts); 1169 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1170 SCM_REALTIME, SOL_SOCKET); 1171 if (*mp) 1172 mp = &(*mp)->m_next; 1173 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1174 struct timespec ts; 1175 1176 nanouptime(&ts); 1177 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1178 SCM_MONOTONIC, SOL_SOCKET); 1179 if (*mp) 1180 mp = &(*mp)->m_next; 1181 } 1182 if (inp->inp_flags & INP_RECVDSTADDR) { 1183 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1184 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1185 if (*mp) 1186 mp = &(*mp)->m_next; 1187 } 1188 if (inp->inp_flags & INP_RECVTTL) { 1189 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1190 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1191 if (*mp) 1192 mp = &(*mp)->m_next; 1193 } 1194 #ifdef notyet 1195 /* XXX 1196 * Moving these out of udp_input() made them even more broken 1197 * than they already were. 1198 */ 1199 /* options were tossed already */ 1200 if (inp->inp_flags & INP_RECVOPTS) { 1201 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1202 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1203 if (*mp) 1204 mp = &(*mp)->m_next; 1205 } 1206 /* ip_srcroute doesn't do what we want here, need to fix */ 1207 if (inp->inp_flags & INP_RECVRETOPTS) { 1208 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1209 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1210 if (*mp) 1211 mp = &(*mp)->m_next; 1212 } 1213 #endif 1214 if (inp->inp_flags & INP_RECVIF) { 1215 struct ifnet *ifp; 1216 struct sdlbuf { 1217 struct sockaddr_dl sdl; 1218 u_char pad[32]; 1219 } sdlbuf; 1220 struct sockaddr_dl *sdp; 1221 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1222 1223 if ((ifp = m->m_pkthdr.rcvif) && 1224 ifp->if_index && ifp->if_index <= V_if_index) { 1225 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1226 /* 1227 * Change our mind and don't try copy. 1228 */ 1229 if (sdp->sdl_family != AF_LINK || 1230 sdp->sdl_len > sizeof(sdlbuf)) { 1231 goto makedummy; 1232 } 1233 bcopy(sdp, sdl2, sdp->sdl_len); 1234 } else { 1235 makedummy: 1236 sdl2->sdl_len = 1237 offsetof(struct sockaddr_dl, sdl_data[0]); 1238 sdl2->sdl_family = AF_LINK; 1239 sdl2->sdl_index = 0; 1240 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1241 } 1242 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1243 IP_RECVIF, IPPROTO_IP); 1244 if (*mp) 1245 mp = &(*mp)->m_next; 1246 } 1247 if (inp->inp_flags & INP_RECVTOS) { 1248 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1249 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1250 if (*mp) 1251 mp = &(*mp)->m_next; 1252 } 1253 1254 if (inp->inp_flags2 & INP_RECVFLOWID) { 1255 uint32_t flowid, flow_type; 1256 1257 flowid = m->m_pkthdr.flowid; 1258 flow_type = M_HASHTYPE_GET(m); 1259 1260 /* 1261 * XXX should handle the failure of one or the 1262 * other - don't populate both? 1263 */ 1264 *mp = sbcreatecontrol((caddr_t) &flowid, 1265 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1266 if (*mp) 1267 mp = &(*mp)->m_next; 1268 *mp = sbcreatecontrol((caddr_t) &flow_type, 1269 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1270 if (*mp) 1271 mp = &(*mp)->m_next; 1272 } 1273 1274 #ifdef RSS 1275 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1276 uint32_t flowid, flow_type; 1277 uint32_t rss_bucketid; 1278 1279 flowid = m->m_pkthdr.flowid; 1280 flow_type = M_HASHTYPE_GET(m); 1281 1282 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1283 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1284 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1285 if (*mp) 1286 mp = &(*mp)->m_next; 1287 } 1288 } 1289 #endif 1290 } 1291 1292 /* 1293 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1294 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1295 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1296 * compiled. 1297 */ 1298 static VNET_DEFINE(int, ip_rsvp_on); 1299 VNET_DEFINE(struct socket *, ip_rsvpd); 1300 1301 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1302 1303 int 1304 ip_rsvp_init(struct socket *so) 1305 { 1306 1307 if (so->so_type != SOCK_RAW || 1308 so->so_proto->pr_protocol != IPPROTO_RSVP) 1309 return EOPNOTSUPP; 1310 1311 if (V_ip_rsvpd != NULL) 1312 return EADDRINUSE; 1313 1314 V_ip_rsvpd = so; 1315 /* 1316 * This may seem silly, but we need to be sure we don't over-increment 1317 * the RSVP counter, in case something slips up. 1318 */ 1319 if (!V_ip_rsvp_on) { 1320 V_ip_rsvp_on = 1; 1321 V_rsvp_on++; 1322 } 1323 1324 return 0; 1325 } 1326 1327 int 1328 ip_rsvp_done(void) 1329 { 1330 1331 V_ip_rsvpd = NULL; 1332 /* 1333 * This may seem silly, but we need to be sure we don't over-decrement 1334 * the RSVP counter, in case something slips up. 1335 */ 1336 if (V_ip_rsvp_on) { 1337 V_ip_rsvp_on = 0; 1338 V_rsvp_on--; 1339 } 1340 return 0; 1341 } 1342 1343 int 1344 rsvp_input(struct mbuf **mp, int *offp, int proto) 1345 { 1346 struct mbuf *m; 1347 1348 m = *mp; 1349 *mp = NULL; 1350 1351 if (rsvp_input_p) { /* call the real one if loaded */ 1352 *mp = m; 1353 rsvp_input_p(mp, offp, proto); 1354 return (IPPROTO_DONE); 1355 } 1356 1357 /* Can still get packets with rsvp_on = 0 if there is a local member 1358 * of the group to which the RSVP packet is addressed. But in this 1359 * case we want to throw the packet away. 1360 */ 1361 1362 if (!V_rsvp_on) { 1363 m_freem(m); 1364 return (IPPROTO_DONE); 1365 } 1366 1367 if (V_ip_rsvpd != NULL) { 1368 *mp = m; 1369 rip_input(mp, offp, proto); 1370 return (IPPROTO_DONE); 1371 } 1372 /* Drop the packet */ 1373 m_freem(m); 1374 return (IPPROTO_DONE); 1375 } 1376