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