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 static int 410 rip_send(struct socket *so, int pruflags, struct mbuf *m, struct sockaddr *nam, 411 struct mbuf *control, struct thread *td) 412 { 413 struct epoch_tracker et; 414 struct ip *ip; 415 struct inpcb *inp; 416 in_addr_t *dst; 417 int error, flags, cnt, hlen; 418 u_char opttype, optlen, *cp; 419 420 inp = sotoinpcb(so); 421 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 422 423 if (control != NULL) { 424 m_freem(control); 425 control = NULL; 426 } 427 428 if (so->so_state & SS_ISCONNECTED) { 429 if (nam) { 430 error = EISCONN; 431 m_freem(m); 432 return (error); 433 } 434 dst = &inp->inp_faddr.s_addr; 435 } else { 436 if (nam == NULL) 437 error = ENOTCONN; 438 else if (nam->sa_family != AF_INET) 439 error = EAFNOSUPPORT; 440 else if (nam->sa_len != sizeof(struct sockaddr_in)) 441 error = EINVAL; 442 else 443 error = 0; 444 if (error != 0) { 445 m_freem(m); 446 return (error); 447 } 448 dst = &((struct sockaddr_in *)nam)->sin_addr.s_addr; 449 } 450 451 flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 452 IP_ALLOWBROADCAST; 453 454 /* 455 * If the user handed us a complete IP packet, use it. Otherwise, 456 * allocate an mbuf for a header and fill it in. 457 */ 458 if ((inp->inp_flags & INP_HDRINCL) == 0) { 459 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 460 m_freem(m); 461 return(EMSGSIZE); 462 } 463 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 464 if (m == NULL) 465 return(ENOBUFS); 466 467 INP_RLOCK(inp); 468 ip = mtod(m, struct ip *); 469 ip->ip_tos = inp->inp_ip_tos; 470 if (inp->inp_flags & INP_DONTFRAG) 471 ip->ip_off = htons(IP_DF); 472 else 473 ip->ip_off = htons(0); 474 ip->ip_p = inp->inp_ip_p; 475 ip->ip_len = htons(m->m_pkthdr.len); 476 ip->ip_src = inp->inp_laddr; 477 ip->ip_dst.s_addr = *dst; 478 #ifdef ROUTE_MPATH 479 if (CALC_FLOWID_OUTBOUND) { 480 uint32_t hash_type, hash_val; 481 482 hash_val = fib4_calc_software_hash(ip->ip_src, 483 ip->ip_dst, 0, 0, ip->ip_p, &hash_type); 484 m->m_pkthdr.flowid = hash_val; 485 M_HASHTYPE_SET(m, hash_type); 486 flags |= IP_NODEFAULTFLOWID; 487 } 488 #endif 489 if (jailed(inp->inp_cred)) { 490 /* 491 * prison_local_ip4() would be good enough but would 492 * let a source of INADDR_ANY pass, which we do not 493 * want to see from jails. 494 */ 495 if (ip->ip_src.s_addr == INADDR_ANY) { 496 NET_EPOCH_ENTER(et); 497 error = in_pcbladdr(inp, &ip->ip_dst, 498 &ip->ip_src, inp->inp_cred); 499 NET_EPOCH_EXIT(et); 500 } else { 501 error = prison_local_ip4(inp->inp_cred, 502 &ip->ip_src); 503 } 504 if (error != 0) { 505 INP_RUNLOCK(inp); 506 m_freem(m); 507 return (error); 508 } 509 } 510 ip->ip_ttl = inp->inp_ip_ttl; 511 } else { 512 if (m->m_pkthdr.len > IP_MAXPACKET) { 513 m_freem(m); 514 return (EMSGSIZE); 515 } 516 if (m->m_pkthdr.len < sizeof(*ip)) { 517 m_freem(m); 518 return (EINVAL); 519 } 520 m = m_pullup(m, sizeof(*ip)); 521 if (m == NULL) 522 return (ENOMEM); 523 ip = mtod(m, struct ip *); 524 hlen = ip->ip_hl << 2; 525 if (m->m_len < hlen) { 526 m = m_pullup(m, hlen); 527 if (m == NULL) 528 return (EINVAL); 529 ip = mtod(m, struct ip *); 530 } 531 #ifdef ROUTE_MPATH 532 if (CALC_FLOWID_OUTBOUND) { 533 uint32_t hash_type, hash_val; 534 535 hash_val = fib4_calc_software_hash(ip->ip_dst, 536 ip->ip_src, 0, 0, ip->ip_p, &hash_type); 537 m->m_pkthdr.flowid = hash_val; 538 M_HASHTYPE_SET(m, hash_type); 539 flags |= IP_NODEFAULTFLOWID; 540 } 541 #endif 542 INP_RLOCK(inp); 543 /* 544 * Don't allow both user specified and setsockopt options, 545 * and don't allow packet length sizes that will crash. 546 */ 547 if ((hlen < sizeof (*ip)) 548 || ((hlen > sizeof (*ip)) && inp->inp_options) 549 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) { 550 INP_RUNLOCK(inp); 551 m_freem(m); 552 return (EINVAL); 553 } 554 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 555 if (error != 0) { 556 INP_RUNLOCK(inp); 557 m_freem(m); 558 return (error); 559 } 560 /* 561 * Don't allow IP options which do not have the required 562 * structure as specified in section 3.1 of RFC 791 on 563 * pages 15-23. 564 */ 565 cp = (u_char *)(ip + 1); 566 cnt = hlen - sizeof (struct ip); 567 for (; cnt > 0; cnt -= optlen, cp += optlen) { 568 opttype = cp[IPOPT_OPTVAL]; 569 if (opttype == IPOPT_EOL) 570 break; 571 if (opttype == IPOPT_NOP) { 572 optlen = 1; 573 continue; 574 } 575 if (cnt < IPOPT_OLEN + sizeof(u_char)) { 576 INP_RUNLOCK(inp); 577 m_freem(m); 578 return (EINVAL); 579 } 580 optlen = cp[IPOPT_OLEN]; 581 if (optlen < IPOPT_OLEN + sizeof(u_char) || 582 optlen > cnt) { 583 INP_RUNLOCK(inp); 584 m_freem(m); 585 return (EINVAL); 586 } 587 } 588 /* 589 * This doesn't allow application to specify ID of zero, 590 * but we got this limitation from the beginning of history. 591 */ 592 if (ip->ip_id == 0) 593 ip_fillid(ip); 594 595 /* 596 * XXX prevent ip_output from overwriting header fields. 597 */ 598 flags |= IP_RAWOUTPUT; 599 IPSTAT_INC(ips_rawout); 600 } 601 602 if (inp->inp_flags & INP_ONESBCAST) 603 flags |= IP_SENDONES; 604 605 #ifdef MAC 606 mac_inpcb_create_mbuf(inp, m); 607 #endif 608 609 NET_EPOCH_ENTER(et); 610 error = ip_output(m, inp->inp_options, NULL, flags, 611 inp->inp_moptions, inp); 612 NET_EPOCH_EXIT(et); 613 INP_RUNLOCK(inp); 614 return (error); 615 } 616 617 /* 618 * Raw IP socket option processing. 619 * 620 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 621 * only be created by a privileged process, and as such, socket option 622 * operations to manage system properties on any raw socket were allowed to 623 * take place without explicit additional access control checks. However, 624 * raw sockets can now also be created in jail(), and therefore explicit 625 * checks are now required. Likewise, raw sockets can be used by a process 626 * after it gives up privilege, so some caution is required. For options 627 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 628 * performed in ip_ctloutput() and therefore no check occurs here. 629 * Unilaterally checking priv_check() here breaks normal IP socket option 630 * operations on raw sockets. 631 * 632 * When adding new socket options here, make sure to add access control 633 * checks here as necessary. 634 * 635 * XXX-BZ inp locking? 636 */ 637 int 638 rip_ctloutput(struct socket *so, struct sockopt *sopt) 639 { 640 struct inpcb *inp = sotoinpcb(so); 641 int error, optval; 642 643 if (sopt->sopt_level != IPPROTO_IP) { 644 if ((sopt->sopt_level == SOL_SOCKET) && 645 (sopt->sopt_name == SO_SETFIB)) { 646 inp->inp_inc.inc_fibnum = so->so_fibnum; 647 return (0); 648 } 649 return (EINVAL); 650 } 651 652 error = 0; 653 switch (sopt->sopt_dir) { 654 case SOPT_GET: 655 switch (sopt->sopt_name) { 656 case IP_HDRINCL: 657 optval = inp->inp_flags & INP_HDRINCL; 658 error = sooptcopyout(sopt, &optval, sizeof optval); 659 break; 660 661 case IP_FW3: /* generic ipfw v.3 functions */ 662 case IP_FW_ADD: /* ADD actually returns the body... */ 663 case IP_FW_GET: 664 case IP_FW_TABLE_GETSIZE: 665 case IP_FW_TABLE_LIST: 666 case IP_FW_NAT_GET_CONFIG: 667 case IP_FW_NAT_GET_LOG: 668 if (V_ip_fw_ctl_ptr != NULL) 669 error = V_ip_fw_ctl_ptr(sopt); 670 else 671 error = ENOPROTOOPT; 672 break; 673 674 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 675 case IP_DUMMYNET_GET: 676 if (ip_dn_ctl_ptr != NULL) 677 error = ip_dn_ctl_ptr(sopt); 678 else 679 error = ENOPROTOOPT; 680 break ; 681 682 case MRT_INIT: 683 case MRT_DONE: 684 case MRT_ADD_VIF: 685 case MRT_DEL_VIF: 686 case MRT_ADD_MFC: 687 case MRT_DEL_MFC: 688 case MRT_VERSION: 689 case MRT_ASSERT: 690 case MRT_API_SUPPORT: 691 case MRT_API_CONFIG: 692 case MRT_ADD_BW_UPCALL: 693 case MRT_DEL_BW_UPCALL: 694 error = priv_check(curthread, PRIV_NETINET_MROUTE); 695 if (error != 0) 696 return (error); 697 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 698 EOPNOTSUPP; 699 break; 700 701 default: 702 error = ip_ctloutput(so, sopt); 703 break; 704 } 705 break; 706 707 case SOPT_SET: 708 switch (sopt->sopt_name) { 709 case IP_HDRINCL: 710 error = sooptcopyin(sopt, &optval, sizeof optval, 711 sizeof optval); 712 if (error) 713 break; 714 if (optval) 715 inp->inp_flags |= INP_HDRINCL; 716 else 717 inp->inp_flags &= ~INP_HDRINCL; 718 break; 719 720 case IP_FW3: /* generic ipfw v.3 functions */ 721 case IP_FW_ADD: 722 case IP_FW_DEL: 723 case IP_FW_FLUSH: 724 case IP_FW_ZERO: 725 case IP_FW_RESETLOG: 726 case IP_FW_TABLE_ADD: 727 case IP_FW_TABLE_DEL: 728 case IP_FW_TABLE_FLUSH: 729 case IP_FW_NAT_CFG: 730 case IP_FW_NAT_DEL: 731 if (V_ip_fw_ctl_ptr != NULL) 732 error = V_ip_fw_ctl_ptr(sopt); 733 else 734 error = ENOPROTOOPT; 735 break; 736 737 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 738 case IP_DUMMYNET_CONFIGURE: 739 case IP_DUMMYNET_DEL: 740 case IP_DUMMYNET_FLUSH: 741 if (ip_dn_ctl_ptr != NULL) 742 error = ip_dn_ctl_ptr(sopt); 743 else 744 error = ENOPROTOOPT ; 745 break ; 746 747 case IP_RSVP_ON: 748 error = priv_check(curthread, PRIV_NETINET_MROUTE); 749 if (error != 0) 750 return (error); 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 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 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 786 EOPNOTSUPP; 787 break; 788 789 default: 790 error = ip_ctloutput(so, sopt); 791 break; 792 } 793 break; 794 } 795 796 return (error); 797 } 798 799 void 800 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 801 { 802 803 switch (cmd) { 804 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 805 case PRC_MSGSIZE: 806 if (IPSEC_ENABLED(ipv4)) 807 IPSEC_CTLINPUT(ipv4, cmd, sa, vip); 808 break; 809 #endif 810 } 811 } 812 813 static int 814 rip_attach(struct socket *so, int proto, struct thread *td) 815 { 816 struct inpcb *inp; 817 int error; 818 819 inp = sotoinpcb(so); 820 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 821 822 error = priv_check(td, PRIV_NETINET_RAW); 823 if (error) 824 return (error); 825 if (proto >= IPPROTO_MAX || proto < 0) 826 return EPROTONOSUPPORT; 827 error = soreserve(so, rip_sendspace, rip_recvspace); 828 if (error) 829 return (error); 830 error = in_pcballoc(so, &V_ripcbinfo); 831 if (error) 832 return (error); 833 inp = (struct inpcb *)so->so_pcb; 834 inp->inp_ip_p = proto; 835 inp->inp_ip_ttl = V_ip_defttl; 836 INP_HASH_WLOCK(&V_ripcbinfo); 837 rip_inshash(inp); 838 INP_HASH_WUNLOCK(&V_ripcbinfo); 839 INP_WUNLOCK(inp); 840 return (0); 841 } 842 843 static void 844 rip_detach(struct socket *so) 845 { 846 struct inpcb *inp; 847 848 inp = sotoinpcb(so); 849 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 850 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 851 ("rip_detach: not closed")); 852 853 /* Disable mrouter first */ 854 if (so == V_ip_mrouter && ip_mrouter_done) 855 ip_mrouter_done(); 856 857 INP_WLOCK(inp); 858 INP_HASH_WLOCK(&V_ripcbinfo); 859 rip_delhash(inp); 860 INP_HASH_WUNLOCK(&V_ripcbinfo); 861 862 if (ip_rsvp_force_done) 863 ip_rsvp_force_done(so); 864 if (so == V_ip_rsvpd) 865 ip_rsvp_done(); 866 in_pcbdetach(inp); 867 in_pcbfree(inp); 868 } 869 870 static void 871 rip_dodisconnect(struct socket *so, struct inpcb *inp) 872 { 873 struct inpcbinfo *pcbinfo; 874 875 pcbinfo = inp->inp_pcbinfo; 876 INP_WLOCK(inp); 877 INP_HASH_WLOCK(pcbinfo); 878 rip_delhash(inp); 879 inp->inp_faddr.s_addr = INADDR_ANY; 880 rip_inshash(inp); 881 INP_HASH_WUNLOCK(pcbinfo); 882 SOCK_LOCK(so); 883 so->so_state &= ~SS_ISCONNECTED; 884 SOCK_UNLOCK(so); 885 INP_WUNLOCK(inp); 886 } 887 888 static void 889 rip_abort(struct socket *so) 890 { 891 struct inpcb *inp; 892 893 inp = sotoinpcb(so); 894 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 895 896 rip_dodisconnect(so, inp); 897 } 898 899 static void 900 rip_close(struct socket *so) 901 { 902 struct inpcb *inp; 903 904 inp = sotoinpcb(so); 905 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 906 907 rip_dodisconnect(so, inp); 908 } 909 910 static int 911 rip_disconnect(struct socket *so) 912 { 913 struct inpcb *inp; 914 915 if ((so->so_state & SS_ISCONNECTED) == 0) 916 return (ENOTCONN); 917 918 inp = sotoinpcb(so); 919 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 920 921 rip_dodisconnect(so, inp); 922 return (0); 923 } 924 925 static int 926 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 927 { 928 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 929 struct inpcb *inp; 930 int error; 931 932 if (nam->sa_family != AF_INET) 933 return (EAFNOSUPPORT); 934 if (nam->sa_len != sizeof(*addr)) 935 return (EINVAL); 936 937 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 938 if (error != 0) 939 return (error); 940 941 inp = sotoinpcb(so); 942 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 943 944 if (CK_STAILQ_EMPTY(&V_ifnet) || 945 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 946 (addr->sin_addr.s_addr && 947 (inp->inp_flags & INP_BINDANY) == 0 && 948 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 949 return (EADDRNOTAVAIL); 950 951 INP_WLOCK(inp); 952 INP_HASH_WLOCK(&V_ripcbinfo); 953 rip_delhash(inp); 954 inp->inp_laddr = addr->sin_addr; 955 rip_inshash(inp); 956 INP_HASH_WUNLOCK(&V_ripcbinfo); 957 INP_WUNLOCK(inp); 958 return (0); 959 } 960 961 static int 962 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 963 { 964 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 965 struct inpcb *inp; 966 967 if (nam->sa_len != sizeof(*addr)) 968 return (EINVAL); 969 if (CK_STAILQ_EMPTY(&V_ifnet)) 970 return (EADDRNOTAVAIL); 971 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 972 return (EAFNOSUPPORT); 973 974 inp = sotoinpcb(so); 975 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 976 977 INP_WLOCK(inp); 978 INP_HASH_WLOCK(&V_ripcbinfo); 979 rip_delhash(inp); 980 inp->inp_faddr = addr->sin_addr; 981 rip_inshash(inp); 982 INP_HASH_WUNLOCK(&V_ripcbinfo); 983 soisconnected(so); 984 INP_WUNLOCK(inp); 985 return (0); 986 } 987 988 static int 989 rip_shutdown(struct socket *so) 990 { 991 struct inpcb *inp; 992 993 inp = sotoinpcb(so); 994 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 995 996 INP_WLOCK(inp); 997 socantsendmore(so); 998 INP_WUNLOCK(inp); 999 return (0); 1000 } 1001 #endif /* INET */ 1002 1003 static int 1004 rip_pcblist(SYSCTL_HANDLER_ARGS) 1005 { 1006 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_ripcbinfo, 1007 INPLOOKUP_RLOCKPCB); 1008 struct xinpgen xig; 1009 struct inpcb *inp; 1010 int error; 1011 1012 if (req->newptr != 0) 1013 return (EPERM); 1014 1015 if (req->oldptr == 0) { 1016 int n; 1017 1018 n = V_ripcbinfo.ipi_count; 1019 n += imax(n / 8, 10); 1020 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1021 return (0); 1022 } 1023 1024 if ((error = sysctl_wire_old_buffer(req, 0)) != 0) 1025 return (error); 1026 1027 bzero(&xig, sizeof(xig)); 1028 xig.xig_len = sizeof xig; 1029 xig.xig_count = V_ripcbinfo.ipi_count; 1030 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1031 xig.xig_sogen = so_gencnt; 1032 error = SYSCTL_OUT(req, &xig, sizeof xig); 1033 if (error) 1034 return (error); 1035 1036 while ((inp = inp_next(&inpi)) != NULL) { 1037 if (inp->inp_gencnt <= xig.xig_gen && 1038 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1039 struct xinpcb xi; 1040 1041 in_pcbtoxinpcb(inp, &xi); 1042 error = SYSCTL_OUT(req, &xi, sizeof xi); 1043 if (error) { 1044 INP_RUNLOCK(inp); 1045 break; 1046 } 1047 } 1048 } 1049 1050 if (!error) { 1051 /* 1052 * Give the user an updated idea of our state. If the 1053 * generation differs from what we told her before, she knows 1054 * that something happened while we were processing this 1055 * request, and it might be necessary to retry. 1056 */ 1057 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1058 xig.xig_sogen = so_gencnt; 1059 xig.xig_count = V_ripcbinfo.ipi_count; 1060 error = SYSCTL_OUT(req, &xig, sizeof xig); 1061 } 1062 1063 return (error); 1064 } 1065 1066 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1067 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1068 rip_pcblist, "S,xinpcb", 1069 "List of active raw IP sockets"); 1070 1071 #ifdef INET 1072 struct pr_usrreqs rip_usrreqs = { 1073 .pru_abort = rip_abort, 1074 .pru_attach = rip_attach, 1075 .pru_bind = rip_bind, 1076 .pru_connect = rip_connect, 1077 .pru_control = in_control, 1078 .pru_detach = rip_detach, 1079 .pru_disconnect = rip_disconnect, 1080 .pru_peeraddr = in_getpeeraddr, 1081 .pru_send = rip_send, 1082 .pru_shutdown = rip_shutdown, 1083 .pru_sockaddr = in_getsockaddr, 1084 .pru_sosetlabel = in_pcbsosetlabel, 1085 .pru_close = rip_close, 1086 }; 1087 #endif /* INET */ 1088