1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_ipsec.h" 41 #include "opt_route.h" 42 43 #include <sys/param.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/eventhandler.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/protosw.h> 53 #include <sys/rwlock.h> 54 #include <sys/signalvar.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 61 #include <vm/uma.h> 62 63 #include <net/if.h> 64 #include <net/if_var.h> 65 #include <net/route.h> 66 #include <net/route/route_ctl.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/in_fib.h> 72 #include <netinet/in_pcb.h> 73 #include <netinet/in_var.h> 74 #include <netinet/if_ether.h> 75 #include <netinet/ip.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_mroute.h> 78 #include <netinet/ip_icmp.h> 79 80 #include <netipsec/ipsec_support.h> 81 82 #include <machine/stdarg.h> 83 #include <security/mac/mac_framework.h> 84 85 VNET_DEFINE(int, ip_defttl) = IPDEFTTL; 86 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW, 87 &VNET_NAME(ip_defttl), 0, 88 "Maximum TTL on IP packets"); 89 90 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 91 #define V_ripcbinfo VNET(ripcbinfo) 92 93 /* 94 * Control and data hooks for ipfw, dummynet, divert and so on. 95 * The data hooks are not used here but it is convenient 96 * to keep them all in one place. 97 */ 98 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 99 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 100 101 int (*ip_dn_ctl_ptr)(struct sockopt *); 102 int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *); 103 void (*ip_divert_ptr)(struct mbuf *, bool); 104 int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool); 105 106 #ifdef INET 107 /* 108 * Hooks for multicast routing. They all default to NULL, so leave them not 109 * initialized and rely on BSS being set to 0. 110 */ 111 112 /* 113 * The socket used to communicate with the multicast routing daemon. 114 */ 115 VNET_DEFINE(struct socket *, ip_mrouter); 116 117 /* 118 * The various mrouter and rsvp functions. 119 */ 120 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 121 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 122 int (*ip_mrouter_done)(void); 123 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 124 struct ip_moptions *); 125 int (*mrt_ioctl)(u_long, caddr_t, int); 126 int (*legal_vif_num)(int); 127 u_long (*ip_mcast_src)(int); 128 129 int (*rsvp_input_p)(struct mbuf **, int *, int); 130 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 131 void (*ip_rsvp_force_done)(struct socket *); 132 #endif /* INET */ 133 134 extern struct protosw inetsw[]; 135 136 u_long rip_sendspace = 9216; 137 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 138 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 139 140 u_long rip_recvspace = 9216; 141 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 142 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 143 144 /* 145 * Hash functions 146 */ 147 148 #define INP_PCBHASH_RAW_SIZE 256 149 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 150 (((proto) + (laddr) + (faddr)) % (mask) + 1) 151 152 #ifdef INET 153 static void 154 rip_inshash(struct inpcb *inp) 155 { 156 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 157 struct inpcbhead *pcbhash; 158 int hash; 159 160 INP_HASH_WLOCK_ASSERT(pcbinfo); 161 INP_WLOCK_ASSERT(inp); 162 163 if (inp->inp_ip_p != 0 && 164 inp->inp_laddr.s_addr != INADDR_ANY && 165 inp->inp_faddr.s_addr != INADDR_ANY) { 166 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 167 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 168 } else 169 hash = 0; 170 pcbhash = &pcbinfo->ipi_hashbase[hash]; 171 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 172 } 173 174 static void 175 rip_delhash(struct inpcb *inp) 176 { 177 178 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); 179 INP_WLOCK_ASSERT(inp); 180 181 CK_LIST_REMOVE(inp, inp_hash); 182 } 183 #endif /* INET */ 184 185 INPCBSTORAGE_DEFINE(ripcbstor, "rawinp", "ripcb", "rip", "riphash"); 186 187 static void 188 rip_init(void *arg __unused) 189 { 190 191 in_pcbinfo_init(&V_ripcbinfo, &ripcbstor, INP_PCBHASH_RAW_SIZE, 1); 192 } 193 VNET_SYSINIT(rip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rip_init, NULL); 194 195 #ifdef VIMAGE 196 static void 197 rip_destroy(void *unused __unused) 198 { 199 200 in_pcbinfo_destroy(&V_ripcbinfo); 201 } 202 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL); 203 #endif 204 205 #ifdef INET 206 static int 207 rip_append(struct inpcb *inp, struct ip *ip, struct mbuf *m, 208 struct sockaddr_in *ripsrc) 209 { 210 struct socket *so = inp->inp_socket; 211 struct mbuf *n, *opts = NULL; 212 213 INP_LOCK_ASSERT(inp); 214 215 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 216 /* check AH/ESP integrity. */ 217 if (IPSEC_ENABLED(ipv4) && IPSEC_CHECK_POLICY(ipv4, m, inp) != 0) 218 return (0); 219 #endif /* IPSEC */ 220 #ifdef MAC 221 if (mac_inpcb_check_deliver(inp, m) != 0) 222 return (0); 223 #endif 224 /* Check the minimum TTL for socket. */ 225 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) 226 return (0); 227 228 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) 229 return (0); 230 231 if ((inp->inp_flags & INP_CONTROLOPTS) || 232 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 233 ip_savecontrol(inp, &opts, ip, n); 234 SOCKBUF_LOCK(&so->so_rcv); 235 if (sbappendaddr_locked(&so->so_rcv, 236 (struct sockaddr *)ripsrc, n, opts) == 0) { 237 soroverflow_locked(so); 238 m_freem(n); 239 if (opts) 240 m_freem(opts); 241 return (0); 242 } 243 sorwakeup_locked(so); 244 245 return (1); 246 } 247 248 struct rip_inp_match_ctx { 249 struct ip *ip; 250 int proto; 251 }; 252 253 static bool 254 rip_inp_match1(const struct inpcb *inp, void *v) 255 { 256 struct rip_inp_match_ctx *ctx = v; 257 258 if (inp->inp_ip_p != ctx->proto) 259 return (false); 260 #ifdef INET6 261 /* XXX inp locking */ 262 if ((inp->inp_vflag & INP_IPV4) == 0) 263 return (false); 264 #endif 265 if (inp->inp_laddr.s_addr != ctx->ip->ip_dst.s_addr) 266 return (false); 267 if (inp->inp_faddr.s_addr != ctx->ip->ip_src.s_addr) 268 return (false); 269 return (true); 270 } 271 272 static bool 273 rip_inp_match2(const struct inpcb *inp, void *v) 274 { 275 struct rip_inp_match_ctx *ctx = v; 276 277 if (inp->inp_ip_p && inp->inp_ip_p != ctx->proto) 278 return (false); 279 #ifdef INET6 280 /* XXX inp locking */ 281 if ((inp->inp_vflag & INP_IPV4) == 0) 282 return (false); 283 #endif 284 if (!in_nullhost(inp->inp_laddr) && 285 !in_hosteq(inp->inp_laddr, ctx->ip->ip_dst)) 286 return (false); 287 if (!in_nullhost(inp->inp_faddr) && 288 !in_hosteq(inp->inp_faddr, ctx->ip->ip_src)) 289 return (false); 290 return (true); 291 } 292 293 /* 294 * Setup generic address and protocol structures for raw_input routine, then 295 * pass them along with mbuf chain. 296 */ 297 int 298 rip_input(struct mbuf **mp, int *offp, int proto) 299 { 300 struct rip_inp_match_ctx ctx = { 301 .ip = mtod(*mp, struct ip *), 302 .proto = proto, 303 }; 304 struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo, 305 INPLOOKUP_RLOCKPCB, rip_inp_match1, &ctx); 306 struct ifnet *ifp; 307 struct mbuf *m = *mp; 308 struct inpcb *inp; 309 struct sockaddr_in ripsrc; 310 int appended; 311 312 *mp = NULL; 313 appended = 0; 314 315 bzero(&ripsrc, sizeof(ripsrc)); 316 ripsrc.sin_len = sizeof(ripsrc); 317 ripsrc.sin_family = AF_INET; 318 ripsrc.sin_addr = ctx.ip->ip_src; 319 320 ifp = m->m_pkthdr.rcvif; 321 322 inpi.hash = INP_PCBHASH_RAW(proto, ctx.ip->ip_src.s_addr, 323 ctx.ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 324 while ((inp = inp_next(&inpi)) != NULL) { 325 INP_RLOCK_ASSERT(inp); 326 if (jailed_without_vnet(inp->inp_cred) && 327 prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0) { 328 /* 329 * XXX: If faddr was bound to multicast group, 330 * jailed raw socket will drop datagram. 331 */ 332 continue; 333 } 334 appended += rip_append(inp, ctx.ip, m, &ripsrc); 335 } 336 337 inpi.hash = 0; 338 inpi.match = rip_inp_match2; 339 MPASS(inpi.inp == NULL); 340 while ((inp = inp_next(&inpi)) != NULL) { 341 INP_RLOCK_ASSERT(inp); 342 if (jailed_without_vnet(inp->inp_cred) && 343 !IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr)) && 344 prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0) 345 /* 346 * Allow raw socket in jail to receive multicast; 347 * assume process had PRIV_NETINET_RAW at attach, 348 * and fall through into normal filter path if so. 349 */ 350 continue; 351 /* 352 * If this raw socket has multicast state, and we 353 * have received a multicast, check if this socket 354 * should receive it, as multicast filtering is now 355 * the responsibility of the transport layer. 356 */ 357 if (inp->inp_moptions != NULL && 358 IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr))) { 359 /* 360 * If the incoming datagram is for IGMP, allow it 361 * through unconditionally to the raw socket. 362 * 363 * In the case of IGMPv2, we may not have explicitly 364 * joined the group, and may have set IFF_ALLMULTI 365 * on the interface. imo_multi_filter() may discard 366 * control traffic we actually need to see. 367 * 368 * Userland multicast routing daemons should continue 369 * filter the control traffic appropriately. 370 */ 371 int blocked; 372 373 blocked = MCAST_PASS; 374 if (proto != IPPROTO_IGMP) { 375 struct sockaddr_in group; 376 377 bzero(&group, sizeof(struct sockaddr_in)); 378 group.sin_len = sizeof(struct sockaddr_in); 379 group.sin_family = AF_INET; 380 group.sin_addr = ctx.ip->ip_dst; 381 382 blocked = imo_multi_filter(inp->inp_moptions, 383 ifp, 384 (struct sockaddr *)&group, 385 (struct sockaddr *)&ripsrc); 386 } 387 388 if (blocked != MCAST_PASS) { 389 IPSTAT_INC(ips_notmember); 390 continue; 391 } 392 } 393 appended += rip_append(inp, ctx.ip, m, &ripsrc); 394 } 395 if (appended == 0 && 396 inetsw[ip_protox[ctx.ip->ip_p]].pr_input == rip_input) { 397 IPSTAT_INC(ips_noproto); 398 IPSTAT_DEC(ips_delivered); 399 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0); 400 } else 401 m_freem(m); 402 return (IPPROTO_DONE); 403 } 404 405 /* 406 * Generate IP header and pass packet to ip_output. Tack on options user may 407 * have setup with control call. 408 */ 409 int 410 rip_output(struct mbuf *m, struct socket *so, ...) 411 { 412 struct epoch_tracker et; 413 struct ip *ip; 414 int error; 415 struct inpcb *inp = sotoinpcb(so); 416 va_list ap; 417 u_long dst; 418 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 419 IP_ALLOWBROADCAST; 420 int cnt, hlen; 421 u_char opttype, optlen, *cp; 422 423 va_start(ap, so); 424 dst = va_arg(ap, u_long); 425 va_end(ap); 426 427 /* 428 * If the user handed us a complete IP packet, use it. Otherwise, 429 * allocate an mbuf for a header and fill it in. 430 */ 431 if ((inp->inp_flags & INP_HDRINCL) == 0) { 432 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 433 m_freem(m); 434 return(EMSGSIZE); 435 } 436 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 437 if (m == NULL) 438 return(ENOBUFS); 439 440 INP_RLOCK(inp); 441 ip = mtod(m, struct ip *); 442 ip->ip_tos = inp->inp_ip_tos; 443 if (inp->inp_flags & INP_DONTFRAG) 444 ip->ip_off = htons(IP_DF); 445 else 446 ip->ip_off = htons(0); 447 ip->ip_p = inp->inp_ip_p; 448 ip->ip_len = htons(m->m_pkthdr.len); 449 ip->ip_src = inp->inp_laddr; 450 ip->ip_dst.s_addr = dst; 451 #ifdef ROUTE_MPATH 452 if (CALC_FLOWID_OUTBOUND) { 453 uint32_t hash_type, hash_val; 454 455 hash_val = fib4_calc_software_hash(ip->ip_src, 456 ip->ip_dst, 0, 0, ip->ip_p, &hash_type); 457 m->m_pkthdr.flowid = hash_val; 458 M_HASHTYPE_SET(m, hash_type); 459 flags |= IP_NODEFAULTFLOWID; 460 } 461 #endif 462 if (jailed(inp->inp_cred)) { 463 /* 464 * prison_local_ip4() would be good enough but would 465 * let a source of INADDR_ANY pass, which we do not 466 * want to see from jails. 467 */ 468 if (ip->ip_src.s_addr == INADDR_ANY) { 469 NET_EPOCH_ENTER(et); 470 error = in_pcbladdr(inp, &ip->ip_dst, 471 &ip->ip_src, inp->inp_cred); 472 NET_EPOCH_EXIT(et); 473 } else { 474 error = prison_local_ip4(inp->inp_cred, 475 &ip->ip_src); 476 } 477 if (error != 0) { 478 INP_RUNLOCK(inp); 479 m_freem(m); 480 return (error); 481 } 482 } 483 ip->ip_ttl = inp->inp_ip_ttl; 484 } else { 485 if (m->m_pkthdr.len > IP_MAXPACKET) { 486 m_freem(m); 487 return (EMSGSIZE); 488 } 489 if (m->m_pkthdr.len < sizeof(*ip)) { 490 m_freem(m); 491 return (EINVAL); 492 } 493 m = m_pullup(m, sizeof(*ip)); 494 if (m == NULL) 495 return (ENOMEM); 496 ip = mtod(m, struct ip *); 497 hlen = ip->ip_hl << 2; 498 if (m->m_len < hlen) { 499 m = m_pullup(m, hlen); 500 if (m == NULL) 501 return (EINVAL); 502 ip = mtod(m, struct ip *); 503 } 504 #ifdef ROUTE_MPATH 505 if (CALC_FLOWID_OUTBOUND) { 506 uint32_t hash_type, hash_val; 507 508 hash_val = fib4_calc_software_hash(ip->ip_dst, 509 ip->ip_src, 0, 0, ip->ip_p, &hash_type); 510 m->m_pkthdr.flowid = hash_val; 511 M_HASHTYPE_SET(m, hash_type); 512 flags |= IP_NODEFAULTFLOWID; 513 } 514 #endif 515 INP_RLOCK(inp); 516 /* 517 * Don't allow both user specified and setsockopt options, 518 * and don't allow packet length sizes that will crash. 519 */ 520 if ((hlen < sizeof (*ip)) 521 || ((hlen > sizeof (*ip)) && inp->inp_options) 522 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) { 523 INP_RUNLOCK(inp); 524 m_freem(m); 525 return (EINVAL); 526 } 527 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 528 if (error != 0) { 529 INP_RUNLOCK(inp); 530 m_freem(m); 531 return (error); 532 } 533 /* 534 * Don't allow IP options which do not have the required 535 * structure as specified in section 3.1 of RFC 791 on 536 * pages 15-23. 537 */ 538 cp = (u_char *)(ip + 1); 539 cnt = hlen - sizeof (struct ip); 540 for (; cnt > 0; cnt -= optlen, cp += optlen) { 541 opttype = cp[IPOPT_OPTVAL]; 542 if (opttype == IPOPT_EOL) 543 break; 544 if (opttype == IPOPT_NOP) { 545 optlen = 1; 546 continue; 547 } 548 if (cnt < IPOPT_OLEN + sizeof(u_char)) { 549 INP_RUNLOCK(inp); 550 m_freem(m); 551 return (EINVAL); 552 } 553 optlen = cp[IPOPT_OLEN]; 554 if (optlen < IPOPT_OLEN + sizeof(u_char) || 555 optlen > cnt) { 556 INP_RUNLOCK(inp); 557 m_freem(m); 558 return (EINVAL); 559 } 560 } 561 /* 562 * This doesn't allow application to specify ID of zero, 563 * but we got this limitation from the beginning of history. 564 */ 565 if (ip->ip_id == 0) 566 ip_fillid(ip); 567 568 /* 569 * XXX prevent ip_output from overwriting header fields. 570 */ 571 flags |= IP_RAWOUTPUT; 572 IPSTAT_INC(ips_rawout); 573 } 574 575 if (inp->inp_flags & INP_ONESBCAST) 576 flags |= IP_SENDONES; 577 578 #ifdef MAC 579 mac_inpcb_create_mbuf(inp, m); 580 #endif 581 582 NET_EPOCH_ENTER(et); 583 error = ip_output(m, inp->inp_options, NULL, flags, 584 inp->inp_moptions, inp); 585 NET_EPOCH_EXIT(et); 586 INP_RUNLOCK(inp); 587 return (error); 588 } 589 590 /* 591 * Raw IP socket option processing. 592 * 593 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 594 * only be created by a privileged process, and as such, socket option 595 * operations to manage system properties on any raw socket were allowed to 596 * take place without explicit additional access control checks. However, 597 * raw sockets can now also be created in jail(), and therefore explicit 598 * checks are now required. Likewise, raw sockets can be used by a process 599 * after it gives up privilege, so some caution is required. For options 600 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 601 * performed in ip_ctloutput() and therefore no check occurs here. 602 * Unilaterally checking priv_check() here breaks normal IP socket option 603 * operations on raw sockets. 604 * 605 * When adding new socket options here, make sure to add access control 606 * checks here as necessary. 607 * 608 * XXX-BZ inp locking? 609 */ 610 int 611 rip_ctloutput(struct socket *so, struct sockopt *sopt) 612 { 613 struct inpcb *inp = sotoinpcb(so); 614 int error, optval; 615 616 if (sopt->sopt_level != IPPROTO_IP) { 617 if ((sopt->sopt_level == SOL_SOCKET) && 618 (sopt->sopt_name == SO_SETFIB)) { 619 inp->inp_inc.inc_fibnum = so->so_fibnum; 620 return (0); 621 } 622 return (EINVAL); 623 } 624 625 error = 0; 626 switch (sopt->sopt_dir) { 627 case SOPT_GET: 628 switch (sopt->sopt_name) { 629 case IP_HDRINCL: 630 optval = inp->inp_flags & INP_HDRINCL; 631 error = sooptcopyout(sopt, &optval, sizeof optval); 632 break; 633 634 case IP_FW3: /* generic ipfw v.3 functions */ 635 case IP_FW_ADD: /* ADD actually returns the body... */ 636 case IP_FW_GET: 637 case IP_FW_TABLE_GETSIZE: 638 case IP_FW_TABLE_LIST: 639 case IP_FW_NAT_GET_CONFIG: 640 case IP_FW_NAT_GET_LOG: 641 if (V_ip_fw_ctl_ptr != NULL) 642 error = V_ip_fw_ctl_ptr(sopt); 643 else 644 error = ENOPROTOOPT; 645 break; 646 647 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 648 case IP_DUMMYNET_GET: 649 if (ip_dn_ctl_ptr != NULL) 650 error = ip_dn_ctl_ptr(sopt); 651 else 652 error = ENOPROTOOPT; 653 break ; 654 655 case MRT_INIT: 656 case MRT_DONE: 657 case MRT_ADD_VIF: 658 case MRT_DEL_VIF: 659 case MRT_ADD_MFC: 660 case MRT_DEL_MFC: 661 case MRT_VERSION: 662 case MRT_ASSERT: 663 case MRT_API_SUPPORT: 664 case MRT_API_CONFIG: 665 case MRT_ADD_BW_UPCALL: 666 case MRT_DEL_BW_UPCALL: 667 error = priv_check(curthread, PRIV_NETINET_MROUTE); 668 if (error != 0) 669 return (error); 670 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 671 EOPNOTSUPP; 672 break; 673 674 default: 675 error = ip_ctloutput(so, sopt); 676 break; 677 } 678 break; 679 680 case SOPT_SET: 681 switch (sopt->sopt_name) { 682 case IP_HDRINCL: 683 error = sooptcopyin(sopt, &optval, sizeof optval, 684 sizeof optval); 685 if (error) 686 break; 687 if (optval) 688 inp->inp_flags |= INP_HDRINCL; 689 else 690 inp->inp_flags &= ~INP_HDRINCL; 691 break; 692 693 case IP_FW3: /* generic ipfw v.3 functions */ 694 case IP_FW_ADD: 695 case IP_FW_DEL: 696 case IP_FW_FLUSH: 697 case IP_FW_ZERO: 698 case IP_FW_RESETLOG: 699 case IP_FW_TABLE_ADD: 700 case IP_FW_TABLE_DEL: 701 case IP_FW_TABLE_FLUSH: 702 case IP_FW_NAT_CFG: 703 case IP_FW_NAT_DEL: 704 if (V_ip_fw_ctl_ptr != NULL) 705 error = V_ip_fw_ctl_ptr(sopt); 706 else 707 error = ENOPROTOOPT; 708 break; 709 710 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 711 case IP_DUMMYNET_CONFIGURE: 712 case IP_DUMMYNET_DEL: 713 case IP_DUMMYNET_FLUSH: 714 if (ip_dn_ctl_ptr != NULL) 715 error = ip_dn_ctl_ptr(sopt); 716 else 717 error = ENOPROTOOPT ; 718 break ; 719 720 case IP_RSVP_ON: 721 error = priv_check(curthread, PRIV_NETINET_MROUTE); 722 if (error != 0) 723 return (error); 724 error = ip_rsvp_init(so); 725 break; 726 727 case IP_RSVP_OFF: 728 error = priv_check(curthread, PRIV_NETINET_MROUTE); 729 if (error != 0) 730 return (error); 731 error = ip_rsvp_done(); 732 break; 733 734 case IP_RSVP_VIF_ON: 735 case IP_RSVP_VIF_OFF: 736 error = priv_check(curthread, PRIV_NETINET_MROUTE); 737 if (error != 0) 738 return (error); 739 error = ip_rsvp_vif ? 740 ip_rsvp_vif(so, sopt) : EINVAL; 741 break; 742 743 case MRT_INIT: 744 case MRT_DONE: 745 case MRT_ADD_VIF: 746 case MRT_DEL_VIF: 747 case MRT_ADD_MFC: 748 case MRT_DEL_MFC: 749 case MRT_VERSION: 750 case MRT_ASSERT: 751 case MRT_API_SUPPORT: 752 case MRT_API_CONFIG: 753 case MRT_ADD_BW_UPCALL: 754 case MRT_DEL_BW_UPCALL: 755 error = priv_check(curthread, PRIV_NETINET_MROUTE); 756 if (error != 0) 757 return (error); 758 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 759 EOPNOTSUPP; 760 break; 761 762 default: 763 error = ip_ctloutput(so, sopt); 764 break; 765 } 766 break; 767 } 768 769 return (error); 770 } 771 772 /* 773 * This function exists solely to receive the PRC_IFDOWN messages which are 774 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 775 * in_ifadown() to remove all routes corresponding to that address. It also 776 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 777 * routes. 778 */ 779 void 780 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 781 { 782 struct in_ifaddr *ia; 783 struct ifnet *ifp; 784 int err; 785 int flags; 786 787 NET_EPOCH_ASSERT(); 788 789 switch (cmd) { 790 case PRC_IFDOWN: 791 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 792 if (ia->ia_ifa.ifa_addr == sa 793 && (ia->ia_flags & IFA_ROUTE)) { 794 ifa_ref(&ia->ia_ifa); 795 /* 796 * in_scrubprefix() kills the interface route. 797 */ 798 in_scrubprefix(ia, 0); 799 /* 800 * in_ifadown gets rid of all the rest of the 801 * routes. This is not quite the right thing 802 * to do, but at least if we are running a 803 * routing process they will come back. 804 */ 805 in_ifadown(&ia->ia_ifa, 0); 806 ifa_free(&ia->ia_ifa); 807 break; 808 } 809 } 810 break; 811 812 case PRC_IFUP: 813 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 814 if (ia->ia_ifa.ifa_addr == sa) 815 break; 816 } 817 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) 818 return; 819 ifa_ref(&ia->ia_ifa); 820 flags = RTF_UP; 821 ifp = ia->ia_ifa.ifa_ifp; 822 823 if ((ifp->if_flags & IFF_LOOPBACK) 824 || (ifp->if_flags & IFF_POINTOPOINT)) 825 flags |= RTF_HOST; 826 827 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 828 829 rt_addrmsg(RTM_ADD, &ia->ia_ifa, ia->ia_ifp->if_fib); 830 err = in_handle_ifaddr_route(RTM_ADD, ia); 831 if (err == 0) 832 ia->ia_flags |= IFA_ROUTE; 833 834 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 835 836 ifa_free(&ia->ia_ifa); 837 break; 838 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 839 case PRC_MSGSIZE: 840 if (IPSEC_ENABLED(ipv4)) 841 IPSEC_CTLINPUT(ipv4, cmd, sa, vip); 842 break; 843 #endif 844 } 845 } 846 847 static int 848 rip_attach(struct socket *so, int proto, struct thread *td) 849 { 850 struct inpcb *inp; 851 int error; 852 853 inp = sotoinpcb(so); 854 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 855 856 error = priv_check(td, PRIV_NETINET_RAW); 857 if (error) 858 return (error); 859 if (proto >= IPPROTO_MAX || proto < 0) 860 return EPROTONOSUPPORT; 861 error = soreserve(so, rip_sendspace, rip_recvspace); 862 if (error) 863 return (error); 864 error = in_pcballoc(so, &V_ripcbinfo); 865 if (error) 866 return (error); 867 inp = (struct inpcb *)so->so_pcb; 868 inp->inp_vflag |= INP_IPV4; 869 inp->inp_ip_p = proto; 870 inp->inp_ip_ttl = V_ip_defttl; 871 INP_HASH_WLOCK(&V_ripcbinfo); 872 rip_inshash(inp); 873 INP_HASH_WUNLOCK(&V_ripcbinfo); 874 INP_WUNLOCK(inp); 875 return (0); 876 } 877 878 static void 879 rip_detach(struct socket *so) 880 { 881 struct inpcb *inp; 882 883 inp = sotoinpcb(so); 884 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 885 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 886 ("rip_detach: not closed")); 887 888 /* Disable mrouter first */ 889 if (so == V_ip_mrouter && ip_mrouter_done) 890 ip_mrouter_done(); 891 892 INP_WLOCK(inp); 893 INP_HASH_WLOCK(&V_ripcbinfo); 894 rip_delhash(inp); 895 INP_HASH_WUNLOCK(&V_ripcbinfo); 896 897 if (ip_rsvp_force_done) 898 ip_rsvp_force_done(so); 899 if (so == V_ip_rsvpd) 900 ip_rsvp_done(); 901 in_pcbdetach(inp); 902 in_pcbfree(inp); 903 } 904 905 static void 906 rip_dodisconnect(struct socket *so, struct inpcb *inp) 907 { 908 struct inpcbinfo *pcbinfo; 909 910 pcbinfo = inp->inp_pcbinfo; 911 INP_WLOCK(inp); 912 INP_HASH_WLOCK(pcbinfo); 913 rip_delhash(inp); 914 inp->inp_faddr.s_addr = INADDR_ANY; 915 rip_inshash(inp); 916 INP_HASH_WUNLOCK(pcbinfo); 917 SOCK_LOCK(so); 918 so->so_state &= ~SS_ISCONNECTED; 919 SOCK_UNLOCK(so); 920 INP_WUNLOCK(inp); 921 } 922 923 static void 924 rip_abort(struct socket *so) 925 { 926 struct inpcb *inp; 927 928 inp = sotoinpcb(so); 929 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 930 931 rip_dodisconnect(so, inp); 932 } 933 934 static void 935 rip_close(struct socket *so) 936 { 937 struct inpcb *inp; 938 939 inp = sotoinpcb(so); 940 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 941 942 rip_dodisconnect(so, inp); 943 } 944 945 static int 946 rip_disconnect(struct socket *so) 947 { 948 struct inpcb *inp; 949 950 if ((so->so_state & SS_ISCONNECTED) == 0) 951 return (ENOTCONN); 952 953 inp = sotoinpcb(so); 954 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 955 956 rip_dodisconnect(so, inp); 957 return (0); 958 } 959 960 static int 961 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 962 { 963 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 964 struct inpcb *inp; 965 int error; 966 967 if (nam->sa_family != AF_INET) 968 return (EAFNOSUPPORT); 969 if (nam->sa_len != sizeof(*addr)) 970 return (EINVAL); 971 972 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 973 if (error != 0) 974 return (error); 975 976 inp = sotoinpcb(so); 977 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 978 979 if (CK_STAILQ_EMPTY(&V_ifnet) || 980 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 981 (addr->sin_addr.s_addr && 982 (inp->inp_flags & INP_BINDANY) == 0 && 983 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 984 return (EADDRNOTAVAIL); 985 986 INP_WLOCK(inp); 987 INP_HASH_WLOCK(&V_ripcbinfo); 988 rip_delhash(inp); 989 inp->inp_laddr = addr->sin_addr; 990 rip_inshash(inp); 991 INP_HASH_WUNLOCK(&V_ripcbinfo); 992 INP_WUNLOCK(inp); 993 return (0); 994 } 995 996 static int 997 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 998 { 999 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 1000 struct inpcb *inp; 1001 1002 if (nam->sa_len != sizeof(*addr)) 1003 return (EINVAL); 1004 if (CK_STAILQ_EMPTY(&V_ifnet)) 1005 return (EADDRNOTAVAIL); 1006 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 1007 return (EAFNOSUPPORT); 1008 1009 inp = sotoinpcb(so); 1010 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 1011 1012 INP_WLOCK(inp); 1013 INP_HASH_WLOCK(&V_ripcbinfo); 1014 rip_delhash(inp); 1015 inp->inp_faddr = addr->sin_addr; 1016 rip_inshash(inp); 1017 INP_HASH_WUNLOCK(&V_ripcbinfo); 1018 soisconnected(so); 1019 INP_WUNLOCK(inp); 1020 return (0); 1021 } 1022 1023 static int 1024 rip_shutdown(struct socket *so) 1025 { 1026 struct inpcb *inp; 1027 1028 inp = sotoinpcb(so); 1029 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 1030 1031 INP_WLOCK(inp); 1032 socantsendmore(so); 1033 INP_WUNLOCK(inp); 1034 return (0); 1035 } 1036 1037 static int 1038 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 1039 struct mbuf *control, struct thread *td) 1040 { 1041 struct inpcb *inp; 1042 u_long dst; 1043 int error; 1044 1045 inp = sotoinpcb(so); 1046 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 1047 1048 if (control != NULL) { 1049 m_freem(control); 1050 control = NULL; 1051 } 1052 1053 /* 1054 * Note: 'dst' reads below are unlocked. 1055 */ 1056 if (so->so_state & SS_ISCONNECTED) { 1057 if (nam) { 1058 error = EISCONN; 1059 goto release; 1060 } 1061 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 1062 } else { 1063 error = 0; 1064 if (nam == NULL) 1065 error = ENOTCONN; 1066 else if (nam->sa_family != AF_INET) 1067 error = EAFNOSUPPORT; 1068 else if (nam->sa_len != sizeof(struct sockaddr_in)) 1069 error = EINVAL; 1070 if (error != 0) 1071 goto release; 1072 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1073 } 1074 return (rip_output(m, so, dst)); 1075 1076 release: 1077 m_freem(m); 1078 return (error); 1079 } 1080 #endif /* INET */ 1081 1082 static int 1083 rip_pcblist(SYSCTL_HANDLER_ARGS) 1084 { 1085 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_ripcbinfo, 1086 INPLOOKUP_RLOCKPCB); 1087 struct xinpgen xig; 1088 struct inpcb *inp; 1089 int error; 1090 1091 if (req->newptr != 0) 1092 return (EPERM); 1093 1094 if (req->oldptr == 0) { 1095 int n; 1096 1097 n = V_ripcbinfo.ipi_count; 1098 n += imax(n / 8, 10); 1099 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1100 return (0); 1101 } 1102 1103 if ((error = sysctl_wire_old_buffer(req, 0)) != 0) 1104 return (error); 1105 1106 bzero(&xig, sizeof(xig)); 1107 xig.xig_len = sizeof xig; 1108 xig.xig_count = V_ripcbinfo.ipi_count; 1109 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1110 xig.xig_sogen = so_gencnt; 1111 error = SYSCTL_OUT(req, &xig, sizeof xig); 1112 if (error) 1113 return (error); 1114 1115 while ((inp = inp_next(&inpi)) != NULL) { 1116 if (inp->inp_gencnt <= xig.xig_gen && 1117 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1118 struct xinpcb xi; 1119 1120 in_pcbtoxinpcb(inp, &xi); 1121 error = SYSCTL_OUT(req, &xi, sizeof xi); 1122 if (error) { 1123 INP_RUNLOCK(inp); 1124 break; 1125 } 1126 } 1127 } 1128 1129 if (!error) { 1130 /* 1131 * Give the user an updated idea of our state. If the 1132 * generation differs from what we told her before, she knows 1133 * that something happened while we were processing this 1134 * request, and it might be necessary to retry. 1135 */ 1136 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1137 xig.xig_sogen = so_gencnt; 1138 xig.xig_count = V_ripcbinfo.ipi_count; 1139 error = SYSCTL_OUT(req, &xig, sizeof xig); 1140 } 1141 1142 return (error); 1143 } 1144 1145 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1146 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1147 rip_pcblist, "S,xinpcb", 1148 "List of active raw IP sockets"); 1149 1150 #ifdef INET 1151 struct pr_usrreqs rip_usrreqs = { 1152 .pru_abort = rip_abort, 1153 .pru_attach = rip_attach, 1154 .pru_bind = rip_bind, 1155 .pru_connect = rip_connect, 1156 .pru_control = in_control, 1157 .pru_detach = rip_detach, 1158 .pru_disconnect = rip_disconnect, 1159 .pru_peeraddr = in_getpeeraddr, 1160 .pru_send = rip_send, 1161 .pru_shutdown = rip_shutdown, 1162 .pru_sockaddr = in_getsockaddr, 1163 .pru_sosetlabel = in_pcbsosetlabel, 1164 .pru_close = rip_close, 1165 }; 1166 #endif /* INET */ 1167