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