1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "opt_bootp.h" 33 #include "opt_inet.h" 34 #include "opt_ipstealth.h" 35 #include "opt_ipsec.h" 36 #include "opt_rss.h" 37 #include "opt_sctp.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/hhook.h> 42 #include <sys/mbuf.h> 43 #include <sys/malloc.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/time.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/rmlock.h> 51 #include <sys/rwlock.h> 52 #include <sys/sdt.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/hash.h> 56 57 #include <net/if.h> 58 #include <net/if_types.h> 59 #include <net/if_var.h> 60 #include <net/if_dl.h> 61 #include <net/if_private.h> 62 #include <net/pfil.h> 63 #include <net/route.h> 64 #include <net/route/nhop.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_fib.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_encap.h> 78 #include <netinet/ip_fw.h> 79 #include <netinet/ip_icmp.h> 80 #include <netinet/igmp_var.h> 81 #include <netinet/ip_options.h> 82 #include <machine/in_cksum.h> 83 #include <netinet/ip_carp.h> 84 #include <netinet/in_rss.h> 85 #include <netinet/ip_mroute.h> 86 #ifdef SCTP 87 #include <netinet/sctp_var.h> 88 #endif 89 90 #include <netipsec/ipsec_support.h> 91 92 #include <sys/socketvar.h> 93 94 #include <security/mac/mac_framework.h> 95 96 #ifdef CTASSERT 97 CTASSERT(sizeof(struct ip) == 20); 98 #endif 99 100 /* IP reassembly functions are defined in ip_reass.c. */ 101 extern void ipreass_init(void); 102 extern void ipreass_vnet_init(void); 103 #ifdef VIMAGE 104 extern void ipreass_destroy(void); 105 #endif 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 /* 115 * Respond with an ICMP host redirect when we forward a packet out of 116 * the same interface on which it was received. See RFC 792. 117 */ 118 VNET_DEFINE(int, ipsendredirects) = 1; 119 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 120 &VNET_NAME(ipsendredirects), 0, 121 "Enable sending IP redirects"); 122 123 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 124 #define V_ip_strong_es VNET(ip_strong_es) 125 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 126 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 127 "Packet's IP destination address must match address on arrival interface"); 128 129 VNET_DEFINE_STATIC(bool, ip_sav) = true; 130 #define V_ip_sav VNET(ip_sav) 131 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 132 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 133 "Drop incoming packets with source address that is a local address"); 134 135 /* Packet filter hooks */ 136 VNET_DEFINE(pfil_head_t, inet_pfil_head); 137 VNET_DEFINE(pfil_head_t, inet_local_pfil_head); 138 139 static struct netisr_handler ip_nh = { 140 .nh_name = "ip", 141 .nh_handler = ip_input, 142 .nh_proto = NETISR_IP, 143 #ifdef RSS 144 .nh_m2cpuid = rss_soft_m2cpuid_v4, 145 .nh_policy = NETISR_POLICY_CPU, 146 .nh_dispatch = NETISR_DISPATCH_HYBRID, 147 #else 148 .nh_policy = NETISR_POLICY_FLOW, 149 #endif 150 }; 151 152 #ifdef RSS 153 /* 154 * Directly dispatched frames are currently assumed 155 * to have a flowid already calculated. 156 * 157 * It should likely have something that assert it 158 * actually has valid flow details. 159 */ 160 static struct netisr_handler ip_direct_nh = { 161 .nh_name = "ip_direct", 162 .nh_handler = ip_direct_input, 163 .nh_proto = NETISR_IP_DIRECT, 164 .nh_m2cpuid = rss_soft_m2cpuid_v4, 165 .nh_policy = NETISR_POLICY_CPU, 166 .nh_dispatch = NETISR_DISPATCH_HYBRID, 167 }; 168 #endif 169 170 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 171 [0 ... IPPROTO_MAX - 1] = rip_input }; 172 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 173 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 174 175 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 | CTLFLAG_MPSAFE, 0, 0, 236 sysctl_netinet_intr_queue_maxlen, "I", 237 "Maximum size of the IP input queue"); 238 239 static int 240 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 241 { 242 u_int64_t qdrops_long; 243 int error, qdrops; 244 245 netisr_getqdrops(&ip_nh, &qdrops_long); 246 qdrops = qdrops_long; 247 error = sysctl_handle_int(oidp, &qdrops, 0, req); 248 if (error || !req->newptr) 249 return (error); 250 if (qdrops != 0) 251 return (EINVAL); 252 netisr_clearqdrops(&ip_nh); 253 return (0); 254 } 255 256 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 257 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 258 0, 0, sysctl_netinet_intr_queue_drops, "I", 259 "Number of packets dropped from the IP input queue"); 260 261 #ifdef RSS 262 static int 263 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 264 { 265 int error, qlimit; 266 267 netisr_getqlimit(&ip_direct_nh, &qlimit); 268 error = sysctl_handle_int(oidp, &qlimit, 0, req); 269 if (error || !req->newptr) 270 return (error); 271 if (qlimit < 1) 272 return (EINVAL); 273 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 274 } 275 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 276 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 277 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 278 "I", "Maximum size of the IP direct input queue"); 279 280 static int 281 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 282 { 283 u_int64_t qdrops_long; 284 int error, qdrops; 285 286 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 287 qdrops = qdrops_long; 288 error = sysctl_handle_int(oidp, &qdrops, 0, req); 289 if (error || !req->newptr) 290 return (error); 291 if (qdrops != 0) 292 return (EINVAL); 293 netisr_clearqdrops(&ip_direct_nh); 294 return (0); 295 } 296 297 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 298 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 299 sysctl_netinet_intr_direct_queue_drops, "I", 300 "Number of packets dropped from the IP direct input queue"); 301 #endif /* RSS */ 302 303 /* 304 * IP initialization: fill in IP protocol switch table. 305 * All protocols not implemented in kernel go to raw IP protocol handler. 306 */ 307 static void 308 ip_vnet_init(void *arg __unused) 309 { 310 CK_STAILQ_INIT(&V_in_ifaddrhead); 311 312 struct hashalloc_args ha = { 313 .size = INADDR_NHASH, 314 .mtype = M_IFADDR, 315 .mflags = M_WAITOK, 316 .head = HASH_HEAD_CK_LIST, 317 }; 318 V_in_ifaddrhashtbl = hashalloc(&ha); 319 V_in_ifaddrhmask = ha.size - 1; 320 321 /* Initialize IP reassembly queue. */ 322 ipreass_vnet_init(); 323 324 /* Initialize packet filter hooks. */ 325 struct pfil_head_args pa = { 326 .pa_version = PFIL_VERSION, 327 .pa_flags = PFIL_IN | PFIL_OUT, 328 .pa_type = PFIL_TYPE_IP4, 329 .pa_headname = PFIL_INET_NAME, 330 }; 331 V_inet_pfil_head = pfil_head_register(&pa); 332 333 pa.pa_flags = PFIL_OUT; 334 pa.pa_headname = PFIL_INET_LOCAL_NAME; 335 V_inet_local_pfil_head = pfil_head_register(&pa); 336 337 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 338 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 339 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 340 printf("%s: WARNING: unable to register input helper hook\n", 341 __func__); 342 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 343 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 344 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 345 printf("%s: WARNING: unable to register output helper hook\n", 346 __func__); 347 348 #ifdef VIMAGE 349 netisr_register_vnet(&ip_nh); 350 #ifdef RSS 351 netisr_register_vnet(&ip_direct_nh); 352 #endif 353 #endif 354 } 355 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 356 ip_vnet_init, NULL); 357 358 static void 359 ip_init(const void *unused __unused) 360 { 361 struct ifnet *ifp; 362 363 ipreass_init(); 364 365 /* 366 * Register statically compiled protocols, that are unlikely to 367 * ever become dynamic. 368 */ 369 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 371 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 372 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 373 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 374 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 375 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 376 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 377 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 378 #ifdef SCTP /* XXX: has a loadable & static version */ 379 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 380 #endif 381 382 netisr_register(&ip_nh); 383 #ifdef RSS 384 netisr_register(&ip_direct_nh); 385 #endif 386 /* 387 * XXXGL: we use SYSINIT() here, but go over V_ifnet. It was the same 388 * way before dom_ifattach removal. This worked because when any 389 * non-default vnet is created, there are no interfaces inside. 390 * Eventually this needs to be fixed. 391 */ 392 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 393 in_ifattach(NULL, ifp); 394 } 395 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 396 397 #ifdef VIMAGE 398 static void 399 ip_destroy(void *unused __unused) 400 { 401 int error; 402 403 #ifdef RSS 404 netisr_unregister_vnet(&ip_direct_nh); 405 #endif 406 netisr_unregister_vnet(&ip_nh); 407 408 pfil_head_unregister(V_inet_pfil_head); 409 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 410 if (error != 0) { 411 printf("%s: WARNING: unable to deregister input helper hook " 412 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 413 "error %d returned\n", __func__, error); 414 } 415 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 416 if (error != 0) { 417 printf("%s: WARNING: unable to deregister output helper hook " 418 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 419 "error %d returned\n", __func__, error); 420 } 421 422 /* Remove the IPv4 addresses from all interfaces. */ 423 in_ifscrub_all(); 424 425 /* Make sure the IPv4 routes are gone as well. */ 426 rib_flush_routes_family(AF_INET); 427 428 /* Destroy IP reassembly queue. */ 429 ipreass_destroy(); 430 431 /* Cleanup in_ifaddr hash table; should be empty. */ 432 struct hashalloc_args ha = { 433 .mtype = M_IFADDR, 434 .head = HASH_HEAD_CK_LIST, 435 .size = V_in_ifaddrhmask + 1, 436 }; 437 hashfree(V_in_ifaddrhashtbl, &ha); 438 } 439 440 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 441 #endif 442 443 #ifdef RSS 444 /* 445 * IP direct input routine. 446 * 447 * This is called when reinjecting completed fragments where 448 * all of the previous checking and book-keeping has been done. 449 */ 450 void 451 ip_direct_input(struct mbuf *m) 452 { 453 struct ip *ip; 454 int hlen; 455 456 ip = mtod(m, struct ip *); 457 hlen = ip->ip_hl << 2; 458 459 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 460 if (IPSEC_ENABLED(ipv4)) { 461 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 462 return; 463 } 464 #endif /* IPSEC */ 465 IPSTAT_INC(ips_delivered); 466 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 467 } 468 #endif 469 470 /* 471 * Ip input routine. Checksum and byte swap header. If fragmented 472 * try to reassemble. Process options. Pass to next level. 473 */ 474 void 475 ip_input(struct mbuf *m) 476 { 477 struct ip *ip = NULL; 478 struct in_ifaddr *ia = NULL; 479 struct ifaddr *ifa; 480 struct ifnet *ifp; 481 int hlen = 0; 482 uint16_t sum, ip_len; 483 int dchg = 0; /* dest changed after fw */ 484 struct in_addr odst; /* original dst address */ 485 bool strong_es; 486 487 M_ASSERTPKTHDR(m); 488 NET_EPOCH_ASSERT(); 489 490 if (m->m_flags & M_FASTFWD_OURS) { 491 m->m_flags &= ~M_FASTFWD_OURS; 492 /* Set up some basics that will be used later. */ 493 ip = mtod(m, struct ip *); 494 hlen = ip->ip_hl << 2; 495 ip_len = ntohs(ip->ip_len); 496 goto ours; 497 } 498 499 IPSTAT_INC(ips_total); 500 501 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 502 goto tooshort; 503 504 if (m->m_len < sizeof(struct ip)) { 505 m = m_pullup(m, sizeof(struct ip)); 506 if (__predict_false(m == NULL)) { 507 IPSTAT_INC(ips_toosmall); 508 return; 509 } 510 } 511 ip = mtod(m, struct ip *); 512 513 if (__predict_false(ip->ip_v != IPVERSION)) { 514 IPSTAT_INC(ips_badvers); 515 goto bad; 516 } 517 518 hlen = ip->ip_hl << 2; 519 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 520 IPSTAT_INC(ips_badhlen); 521 goto bad; 522 } 523 if (hlen > m->m_len) { 524 m = m_pullup(m, hlen); 525 if (__predict_false(m == NULL)) { 526 IPSTAT_INC(ips_badhlen); 527 return; 528 } 529 ip = mtod(m, struct ip *); 530 } 531 532 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 533 534 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 535 ifp = m->m_pkthdr.rcvif; 536 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 537 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 538 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 539 IPSTAT_INC(ips_badaddr); 540 goto bad; 541 } 542 } 543 544 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 545 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 546 } else if (m->m_pkthdr.csum_flags & CSUM_IP) { 547 /* 548 * Packet from local host that offloaded checksum computation. 549 * Checksum not required since the packet wasn't on the wire. 550 */ 551 sum = 0; 552 } else { 553 if (hlen == sizeof(struct ip)) { 554 sum = in_cksum_hdr(ip); 555 } else { 556 sum = in_cksum(m, hlen); 557 } 558 } 559 if (__predict_false(sum)) { 560 IPSTAT_INC(ips_badsum); 561 goto bad; 562 } 563 564 ip_len = ntohs(ip->ip_len); 565 if (__predict_false(ip_len < hlen)) { 566 IPSTAT_INC(ips_badlen); 567 goto bad; 568 } 569 570 /* 571 * Check that the amount of data in the buffers 572 * is as at least much as the IP header would have us expect. 573 * Trim mbufs if longer than we expect. 574 * Drop packet if shorter than we expect. 575 */ 576 if (__predict_false(m->m_pkthdr.len < ip_len)) { 577 tooshort: 578 IPSTAT_INC(ips_tooshort); 579 goto bad; 580 } 581 if (m->m_pkthdr.len > ip_len) { 582 if (m->m_len == m->m_pkthdr.len) { 583 m->m_len = ip_len; 584 m->m_pkthdr.len = ip_len; 585 } else 586 m_adj(m, ip_len - m->m_pkthdr.len); 587 } 588 589 /* 590 * Try to forward the packet, but if we fail continue. 591 * ip_tryforward() may generate redirects these days. 592 * XXX the logic below falling through to normal processing 593 * if redirects are required should be revisited as well. 594 * ip_tryforward() does inbound and outbound packet firewall 595 * processing. If firewall has decided that destination becomes 596 * our local address, it sets M_FASTFWD_OURS flag. In this 597 * case skip another inbound firewall processing and update 598 * ip pointer. 599 */ 600 if (V_ipforwarding != 0 601 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 602 && (!IPSEC_ENABLED(ipv4) || 603 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 604 #endif 605 ) { 606 /* 607 * ip_dooptions() was run so we can ignore the source route (or 608 * any IP options case) case for redirects in ip_tryforward(). 609 */ 610 if ((m = ip_tryforward(m)) == NULL) 611 return; 612 if (m->m_flags & M_FASTFWD_OURS) { 613 m->m_flags &= ~M_FASTFWD_OURS; 614 ip = mtod(m, struct ip *); 615 goto ours; 616 } 617 } 618 619 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 620 /* 621 * Bypass packet filtering for packets previously handled by IPsec. 622 */ 623 if (IPSEC_ENABLED(ipv4) && 624 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 625 goto passin; 626 #endif 627 628 /* 629 * Run through list of hooks for input packets. 630 * 631 * NB: Beware of the destination address changing (e.g. 632 * by NAT rewriting). When this happens, tell 633 * ip_forward to do the right thing. 634 */ 635 636 /* Jump over all PFIL processing if hooks are not active. */ 637 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 638 goto passin; 639 640 odst = ip->ip_dst; 641 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 642 PFIL_PASS) 643 return; 644 645 ip = mtod(m, struct ip *); 646 dchg = (odst.s_addr != ip->ip_dst.s_addr); 647 648 if (m->m_flags & M_FASTFWD_OURS) { 649 m->m_flags &= ~M_FASTFWD_OURS; 650 goto ours; 651 } 652 if (m->m_flags & M_IP_NEXTHOP) { 653 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 654 /* 655 * Directly ship the packet on. This allows 656 * forwarding packets originally destined to us 657 * to some other directly connected host. 658 */ 659 ip_forward(m, 1); 660 return; 661 } 662 } 663 passin: 664 /* 665 * The unspecified address can appear only as a src address - RFC1122. 666 * 667 * The check is deferred to here to give firewalls a chance to block 668 * (and log) such packets. ip_tryforward() will not process such 669 * packets. 670 */ 671 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 672 IPSTAT_INC(ips_badaddr); 673 goto bad; 674 } 675 676 /* 677 * Process options and, if not destined for us, 678 * ship it on. ip_dooptions returns 1 when an 679 * error was detected (causing an icmp message 680 * to be sent and the original packet to be freed). 681 */ 682 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 683 return; 684 685 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 686 * matter if it is destined to another node, or whether it is 687 * a multicast one, RSVP wants it! and prevents it from being forwarded 688 * anywhere else. Also checks if the rsvp daemon is running before 689 * grabbing the packet. 690 */ 691 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 692 goto ours; 693 694 /* 695 * Check our list of addresses, to see if the packet is for us. 696 * If we don't have any addresses, assume any unicast packet 697 * we receive might be for us (and let the upper layers deal 698 * with it). 699 */ 700 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 701 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 702 goto ours; 703 704 /* 705 * Enable a consistency check between the destination address 706 * and the arrival interface for a unicast packet (the RFC 1122 707 * strong ES model) with a list of additional predicates: 708 * - if IP forwarding is disabled 709 * - the packet is not locally generated 710 * - the packet is not subject to 'ipfw fwd' 711 * - Interface is not running CARP. If the packet got here, we already 712 * checked it with carp_iamatch() and carp_forus(). 713 */ 714 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 715 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 716 ifp->if_carp == NULL && (dchg == 0); 717 718 /* 719 * Check for exact addresses in the hash bucket. 720 */ 721 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 722 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 723 continue; 724 725 /* 726 * net.inet.ip.rfc1122_strong_es: the address matches, verify 727 * that the packet arrived via the correct interface. 728 */ 729 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 730 IPSTAT_INC(ips_badaddr); 731 goto bad; 732 } 733 734 /* 735 * net.inet.ip.source_address_validation: drop incoming 736 * packets that pretend to be ours. 737 */ 738 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 739 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 740 IPSTAT_INC(ips_badaddr); 741 goto bad; 742 } 743 744 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 745 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 746 goto ours; 747 } 748 749 /* 750 * Check for broadcast addresses. 751 * 752 * Only accept broadcast packets that arrive via the matching 753 * interface. Reception of forwarded directed broadcasts would 754 * be handled via ip_forward() and ether_output() with the loopback 755 * into the stack for SIMPLEX interfaces handled by ether_output(). 756 */ 757 if (ifp->if_flags & IFF_BROADCAST) { 758 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 759 if (ifa->ifa_addr->sa_family != AF_INET) 760 continue; 761 ia = ifatoia(ifa); 762 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 763 ip->ip_dst.s_addr) { 764 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 765 counter_u64_add(ia->ia_ifa.ifa_ibytes, 766 m->m_pkthdr.len); 767 goto ours; 768 } 769 #ifdef BOOTP_COMPAT 770 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 771 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 772 counter_u64_add(ia->ia_ifa.ifa_ibytes, 773 m->m_pkthdr.len); 774 goto ours; 775 } 776 #endif 777 } 778 ia = NULL; 779 } 780 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 781 /* 782 * RFC 3927 2.7: Do not forward multicast packets from 783 * IN_LINKLOCAL. 784 */ 785 if (V_ip_mrouting_enabled && 786 !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 787 /* 788 * If we are acting as a multicast router, all 789 * incoming multicast packets are passed to the 790 * kernel-level multicast forwarding function. 791 * The packet is returned (relatively) intact; if 792 * ip_mforward() returns a non-zero value, the packet 793 * must be discarded, else it may be accepted below. 794 */ 795 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 796 IPSTAT_INC(ips_cantforward); 797 m_freem(m); 798 return; 799 } 800 801 /* 802 * The process-level routing daemon needs to receive 803 * all multicast IGMP packets, whether or not this 804 * host belongs to their destination groups. 805 */ 806 if (ip->ip_p == IPPROTO_IGMP) { 807 goto ours; 808 } 809 IPSTAT_INC(ips_forward); 810 } 811 /* 812 * Assume the packet is for us, to avoid prematurely taking 813 * a lock on the in_multi hash. Protocols must perform 814 * their own filtering and update statistics accordingly. 815 */ 816 goto ours; 817 } 818 if (in_broadcast(ip->ip_dst)) 819 goto ours; 820 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 821 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 822 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 823 IPSTAT_INC(ips_cantforward); 824 m_freem(m); 825 return; 826 } 827 828 /* 829 * Not for us; forward if possible and desirable. 830 */ 831 if (V_ipforwarding == 0) { 832 IPSTAT_INC(ips_cantforward); 833 m_freem(m); 834 } else { 835 ip_forward(m, dchg); 836 } 837 return; 838 839 ours: 840 #ifdef IPSTEALTH 841 /* 842 * IPSTEALTH: Process non-routing options only 843 * if the packet is destined for us. 844 */ 845 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 846 return; 847 #endif /* IPSTEALTH */ 848 849 /* 850 * We are going to ship the packet to the local protocol stack. Call the 851 * filter again for this 'output' action, allowing redirect-like rules 852 * to adjust the source address. 853 */ 854 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 855 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 856 PFIL_PASS) 857 return; 858 ip = mtod(m, struct ip *); 859 } 860 861 /* 862 * Attempt reassembly; if it succeeds, proceed. 863 * ip_reass() will return a different mbuf. 864 */ 865 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 866 /* XXXGL: shouldn't we save & set m_flags? */ 867 m = ip_reass(m); 868 if (m == NULL) 869 return; 870 ip = mtod(m, struct ip *); 871 /* Get the header length of the reassembled packet */ 872 hlen = ip->ip_hl << 2; 873 } 874 875 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 876 if (IPSEC_ENABLED(ipv4)) { 877 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 878 return; 879 } 880 #endif /* IPSEC */ 881 882 /* 883 * Switch out to protocol's input routine. 884 */ 885 IPSTAT_INC(ips_delivered); 886 887 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 888 return; 889 bad: 890 m_freem(m); 891 } 892 893 int 894 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 895 { 896 897 MPASS(proto > 0); 898 899 /* 900 * The protocol slot must not be occupied by another protocol 901 * already. An index pointing to rip_input() is unused. 902 */ 903 if (ip_protox[proto] == rip_input) { 904 ip_protox[proto] = input; 905 ip_ctlprotox[proto] = ctl; 906 return (0); 907 } else 908 return (EEXIST); 909 } 910 911 int 912 ipproto_unregister(uint8_t proto) 913 { 914 915 MPASS(proto > 0); 916 917 if (ip_protox[proto] != rip_input) { 918 ip_protox[proto] = rip_input; 919 ip_ctlprotox[proto] = rip_ctlinput; 920 return (0); 921 } else 922 return (ENOENT); 923 } 924 925 /* 926 * Forward a packet. If some error occurs return the sender 927 * an icmp packet. Note we can't always generate a meaningful 928 * icmp message because icmp doesn't have a large enough repertoire 929 * of codes and types. 930 * 931 * If not forwarding, just drop the packet. This could be confusing 932 * if ipforwarding was zero but some routing protocol was advancing 933 * us as a gateway to somewhere. However, we must let the routing 934 * protocol deal with that. 935 * 936 * The srcrt parameter indicates whether the packet is being forwarded 937 * via a source route. 938 */ 939 void 940 ip_forward(struct mbuf *m, int srcrt) 941 { 942 struct ip *ip = mtod(m, struct ip *); 943 struct in_ifaddr *ia; 944 struct mbuf *mcopy; 945 struct sockaddr_in *sin; 946 struct in_addr dest; 947 struct route ro; 948 uint32_t flowid; 949 int error, type = 0, code = 0, mtu = 0; 950 951 NET_EPOCH_ASSERT(); 952 953 if (m->m_flags & (M_BCAST|M_MCAST) || !in_canforward(ip->ip_dst)) { 954 IPSTAT_INC(ips_cantforward); 955 m_freem(m); 956 return; 957 } 958 if ( 959 #ifdef IPSTEALTH 960 V_ipstealth == 0 && 961 #endif 962 ip->ip_ttl <= IPTTLDEC) { 963 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 964 return; 965 } 966 967 bzero(&ro, sizeof(ro)); 968 sin = (struct sockaddr_in *)&ro.ro_dst; 969 sin->sin_family = AF_INET; 970 sin->sin_len = sizeof(*sin); 971 sin->sin_addr = ip->ip_dst; 972 flowid = m->m_pkthdr.flowid; 973 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 974 if (ro.ro_nh != NULL) { 975 if (ro.ro_nh->nh_flags & (NHF_BLACKHOLE | NHF_BROADCAST)) { 976 IPSTAT_INC(ips_cantforward); 977 m_freem(m); 978 NH_FREE(ro.ro_nh); 979 return; 980 } 981 if (ro.ro_nh->nh_flags & NHF_REJECT) { 982 IPSTAT_INC(ips_cantforward); 983 NH_FREE(ro.ro_nh); 984 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 985 return; 986 } 987 ia = ifatoia(ro.ro_nh->nh_ifa); 988 } else 989 ia = NULL; 990 /* 991 * Save the IP header and at most 8 bytes of the payload, 992 * in case we need to generate an ICMP message to the src. 993 * 994 * XXX this can be optimized a lot by saving the data in a local 995 * buffer on the stack (72 bytes at most), and only allocating the 996 * mbuf if really necessary. The vast majority of the packets 997 * are forwarded without having to send an ICMP back (either 998 * because unnecessary, or because rate limited), so we are 999 * really we are wasting a lot of work here. 1000 * 1001 * We don't use m_copym() because it might return a reference 1002 * to a shared cluster. Both this function and ip_output() 1003 * assume exclusive access to the IP header in `m', so any 1004 * data in a cluster may change before we reach icmp_error(). 1005 */ 1006 mcopy = m_gethdr(M_NOWAIT, m->m_type); 1007 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 1008 /* 1009 * It's probably ok if the pkthdr dup fails (because 1010 * the deep copy of the tag chain failed), but for now 1011 * be conservative and just discard the copy since 1012 * code below may some day want the tags. 1013 */ 1014 m_free(mcopy); 1015 mcopy = NULL; 1016 } 1017 if (mcopy != NULL) { 1018 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1019 mcopy->m_pkthdr.len = mcopy->m_len; 1020 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1021 } 1022 #ifdef IPSTEALTH 1023 if (V_ipstealth == 0) 1024 #endif 1025 ip->ip_ttl -= IPTTLDEC; 1026 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1027 if (IPSEC_ENABLED(ipv4)) { 1028 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1029 /* mbuf consumed by IPsec */ 1030 RO_NHFREE(&ro); 1031 m_freem(mcopy); 1032 if (error != EINPROGRESS) 1033 IPSTAT_INC(ips_cantforward); 1034 return; 1035 } 1036 /* No IPsec processing required */ 1037 } 1038 #endif /* IPSEC */ 1039 /* 1040 * If forwarding packet using same interface that it came in on, 1041 * perhaps should send a redirect to sender to shortcut a hop. 1042 * Only send redirect if source is sending directly to us, 1043 * and if packet was not source routed (or has any options). 1044 * Also, don't send redirect if forwarding using a default route 1045 * or a route modified by a redirect. 1046 */ 1047 dest.s_addr = 0; 1048 if (!srcrt && V_ipsendredirects && 1049 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1050 struct nhop_object *nh; 1051 1052 nh = ro.ro_nh; 1053 1054 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1055 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1056 u_long src = ntohl(ip->ip_src.s_addr); 1057 1058 if (nh_ia != NULL && 1059 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1060 /* Router requirements says to only send host redirects */ 1061 type = ICMP_REDIRECT; 1062 code = ICMP_REDIRECT_HOST; 1063 if (nh->nh_flags & NHF_GATEWAY) { 1064 if (nh->gw_sa.sa_family == AF_INET) 1065 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1066 else /* Do not redirect in case gw is AF_INET6 */ 1067 type = 0; 1068 } else 1069 dest.s_addr = ip->ip_dst.s_addr; 1070 } 1071 } 1072 } 1073 1074 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1075 1076 if (error == EMSGSIZE && ro.ro_nh) 1077 mtu = ro.ro_nh->nh_mtu; 1078 RO_NHFREE(&ro); 1079 1080 if (error) 1081 IPSTAT_INC(ips_cantforward); 1082 else { 1083 IPSTAT_INC(ips_forward); 1084 if (type) 1085 IPSTAT_INC(ips_redirectsent); 1086 else { 1087 if (mcopy) 1088 m_freem(mcopy); 1089 return; 1090 } 1091 } 1092 if (mcopy == NULL) 1093 return; 1094 1095 switch (error) { 1096 case 0: /* forwarded, but need redirect */ 1097 /* type, code set above */ 1098 break; 1099 1100 case ENETUNREACH: 1101 case EHOSTUNREACH: 1102 case ENETDOWN: 1103 case EHOSTDOWN: 1104 default: 1105 type = ICMP_UNREACH; 1106 code = ICMP_UNREACH_HOST; 1107 break; 1108 1109 case EMSGSIZE: 1110 type = ICMP_UNREACH; 1111 code = ICMP_UNREACH_NEEDFRAG; 1112 /* 1113 * If the MTU was set before make sure we are below the 1114 * interface MTU. 1115 * If the MTU wasn't set before use the interface mtu or 1116 * fall back to the next smaller mtu step compared to the 1117 * current packet size. 1118 */ 1119 if (mtu != 0) { 1120 if (ia != NULL) 1121 mtu = min(mtu, ia->ia_ifp->if_mtu); 1122 } else { 1123 if (ia != NULL) 1124 mtu = ia->ia_ifp->if_mtu; 1125 else 1126 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1127 } 1128 IPSTAT_INC(ips_cantfrag); 1129 break; 1130 1131 case ENOBUFS: 1132 case EACCES: /* ipfw denied packet */ 1133 m_freem(mcopy); 1134 return; 1135 } 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 bool stamped; 1147 1148 stamped = false; 1149 if ((inp->inp_socket->so_options & SO_BINTIME) || 1150 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1151 struct bintime boottimebin, bt; 1152 struct timespec ts1; 1153 1154 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1155 M_TSTMP)) { 1156 mbuf_tstmp2timespec(m, &ts1); 1157 timespec2bintime(&ts1, &bt); 1158 getboottimebin(&boottimebin); 1159 bintime_add(&bt, &boottimebin); 1160 } else { 1161 bintime(&bt); 1162 } 1163 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1164 SOL_SOCKET, M_NOWAIT); 1165 if (*mp != NULL) { 1166 mp = &(*mp)->m_next; 1167 stamped = true; 1168 } 1169 } 1170 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1171 struct bintime boottimebin, bt1; 1172 struct timespec ts1; 1173 struct timeval tv; 1174 1175 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1176 M_TSTMP)) { 1177 mbuf_tstmp2timespec(m, &ts1); 1178 timespec2bintime(&ts1, &bt1); 1179 getboottimebin(&boottimebin); 1180 bintime_add(&bt1, &boottimebin); 1181 bintime2timeval(&bt1, &tv); 1182 } else { 1183 microtime(&tv); 1184 } 1185 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1186 SOL_SOCKET, M_NOWAIT); 1187 if (*mp != NULL) { 1188 mp = &(*mp)->m_next; 1189 stamped = true; 1190 } 1191 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1192 struct bintime boottimebin; 1193 struct timespec ts, ts1; 1194 1195 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1196 M_TSTMP)) { 1197 mbuf_tstmp2timespec(m, &ts); 1198 getboottimebin(&boottimebin); 1199 bintime2timespec(&boottimebin, &ts1); 1200 timespecadd(&ts, &ts1, &ts); 1201 } else { 1202 nanotime(&ts); 1203 } 1204 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1205 SOL_SOCKET, M_NOWAIT); 1206 if (*mp != NULL) { 1207 mp = &(*mp)->m_next; 1208 stamped = true; 1209 } 1210 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1211 struct timespec ts; 1212 1213 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1214 M_TSTMP)) 1215 mbuf_tstmp2timespec(m, &ts); 1216 else 1217 nanouptime(&ts); 1218 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1219 SOL_SOCKET, M_NOWAIT); 1220 if (*mp != NULL) { 1221 mp = &(*mp)->m_next; 1222 stamped = true; 1223 } 1224 } 1225 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1226 M_TSTMP)) { 1227 struct sock_timestamp_info sti; 1228 1229 bzero(&sti, sizeof(sti)); 1230 sti.st_info_flags = ST_INFO_HW; 1231 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1232 sti.st_info_flags |= ST_INFO_HW_HPREC; 1233 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1234 SOL_SOCKET, M_NOWAIT); 1235 if (*mp != NULL) 1236 mp = &(*mp)->m_next; 1237 } 1238 if (inp->inp_flags & INP_RECVDSTADDR) { 1239 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1240 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1241 if (*mp) 1242 mp = &(*mp)->m_next; 1243 } 1244 if (inp->inp_flags & INP_RECVTTL) { 1245 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1246 IPPROTO_IP, M_NOWAIT); 1247 if (*mp) 1248 mp = &(*mp)->m_next; 1249 } 1250 #ifdef notyet 1251 /* XXX 1252 * Moving these out of udp_input() made them even more broken 1253 * than they already were. 1254 */ 1255 /* options were tossed already */ 1256 if (inp->inp_flags & INP_RECVOPTS) { 1257 *mp = sbcreatecontrol(opts_deleted_above, 1258 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1259 if (*mp) 1260 mp = &(*mp)->m_next; 1261 } 1262 /* ip_srcroute doesn't do what we want here, need to fix */ 1263 if (inp->inp_flags & INP_RECVRETOPTS) { 1264 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1265 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1266 if (*mp) 1267 mp = &(*mp)->m_next; 1268 } 1269 #endif 1270 if (inp->inp_flags & INP_RECVIF) { 1271 struct ifnet *ifp; 1272 struct sdlbuf { 1273 struct sockaddr_dl sdl; 1274 u_char pad[32]; 1275 } sdlbuf; 1276 struct sockaddr_dl *sdp; 1277 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1278 1279 if ((ifp = m->m_pkthdr.rcvif)) { 1280 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1281 /* 1282 * Change our mind and don't try copy. 1283 */ 1284 if (sdp->sdl_family != AF_LINK || 1285 sdp->sdl_len > sizeof(sdlbuf)) { 1286 goto makedummy; 1287 } 1288 bcopy(sdp, sdl2, sdp->sdl_len); 1289 } else { 1290 makedummy: 1291 sdl2->sdl_len = 1292 offsetof(struct sockaddr_dl, sdl_data[0]); 1293 sdl2->sdl_family = AF_LINK; 1294 sdl2->sdl_index = 0; 1295 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1296 } 1297 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1298 IPPROTO_IP, M_NOWAIT); 1299 if (*mp) 1300 mp = &(*mp)->m_next; 1301 } 1302 if (inp->inp_flags & INP_RECVTOS) { 1303 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1304 IPPROTO_IP, M_NOWAIT); 1305 if (*mp) 1306 mp = &(*mp)->m_next; 1307 } 1308 1309 if (inp->inp_flags2 & INP_RECVFLOWID) { 1310 uint32_t flowid, flow_type; 1311 1312 flowid = m->m_pkthdr.flowid; 1313 flow_type = M_HASHTYPE_GET(m); 1314 1315 /* 1316 * XXX should handle the failure of one or the 1317 * other - don't populate both? 1318 */ 1319 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1320 IPPROTO_IP, M_NOWAIT); 1321 if (*mp) 1322 mp = &(*mp)->m_next; 1323 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1324 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1325 if (*mp) 1326 mp = &(*mp)->m_next; 1327 } 1328 1329 #ifdef RSS 1330 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1331 uint32_t flowid, flow_type; 1332 uint32_t rss_bucketid; 1333 1334 flowid = m->m_pkthdr.flowid; 1335 flow_type = M_HASHTYPE_GET(m); 1336 1337 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1338 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1339 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1340 if (*mp) 1341 mp = &(*mp)->m_next; 1342 } 1343 } 1344 #endif 1345 } 1346 1347 /* 1348 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1349 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1350 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1351 * compiled. 1352 */ 1353 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1354 VNET_DEFINE(struct socket *, ip_rsvpd); 1355 1356 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1357 1358 int 1359 ip_rsvp_init(struct socket *so) 1360 { 1361 1362 if (V_ip_rsvpd != NULL) 1363 return EADDRINUSE; 1364 1365 V_ip_rsvpd = so; 1366 /* 1367 * This may seem silly, but we need to be sure we don't over-increment 1368 * the RSVP counter, in case something slips up. 1369 */ 1370 if (!V_ip_rsvp_on) { 1371 V_ip_rsvp_on = 1; 1372 V_rsvp_on++; 1373 } 1374 1375 return 0; 1376 } 1377 1378 int 1379 ip_rsvp_done(void) 1380 { 1381 1382 V_ip_rsvpd = NULL; 1383 /* 1384 * This may seem silly, but we need to be sure we don't over-decrement 1385 * the RSVP counter, in case something slips up. 1386 */ 1387 if (V_ip_rsvp_on) { 1388 V_ip_rsvp_on = 0; 1389 V_rsvp_on--; 1390 } 1391 return 0; 1392 } 1393 1394 int 1395 rsvp_input(struct mbuf **mp, int *offp, int proto) 1396 { 1397 struct mbuf *m; 1398 1399 m = *mp; 1400 *mp = NULL; 1401 1402 if (rsvp_input_p) { /* call the real one if loaded */ 1403 *mp = m; 1404 rsvp_input_p(mp, offp, proto); 1405 return (IPPROTO_DONE); 1406 } 1407 1408 /* Can still get packets with rsvp_on = 0 if there is a local member 1409 * of the group to which the RSVP packet is addressed. But in this 1410 * case we want to throw the packet away. 1411 */ 1412 1413 if (!V_rsvp_on) { 1414 m_freem(m); 1415 return (IPPROTO_DONE); 1416 } 1417 1418 if (V_ip_rsvpd != NULL) { 1419 *mp = m; 1420 rip_input(mp, offp, proto); 1421 return (IPPROTO_DONE); 1422 } 1423 /* Drop the packet */ 1424 m_freem(m); 1425 return (IPPROTO_DONE); 1426 } 1427