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 inpcbhead, ripcb); 91 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 92 93 #define V_ripcb VNET(ripcb) 94 #define V_ripcbinfo VNET(ripcbinfo) 95 96 /* 97 * Control and data hooks for ipfw, dummynet, divert and so on. 98 * The data hooks are not used here but it is convenient 99 * to keep them all in one place. 100 */ 101 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 102 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 103 104 int (*ip_dn_ctl_ptr)(struct sockopt *); 105 int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *); 106 void (*ip_divert_ptr)(struct mbuf *, bool); 107 int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool); 108 109 #ifdef INET 110 /* 111 * Hooks for multicast routing. They all default to NULL, so leave them not 112 * initialized and rely on BSS being set to 0. 113 */ 114 115 /* 116 * The socket used to communicate with the multicast routing daemon. 117 */ 118 VNET_DEFINE(struct socket *, ip_mrouter); 119 120 /* 121 * The various mrouter and rsvp functions. 122 */ 123 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 124 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 125 int (*ip_mrouter_done)(void); 126 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 127 struct ip_moptions *); 128 int (*mrt_ioctl)(u_long, caddr_t, int); 129 int (*legal_vif_num)(int); 130 u_long (*ip_mcast_src)(int); 131 132 int (*rsvp_input_p)(struct mbuf **, int *, int); 133 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 134 void (*ip_rsvp_force_done)(struct socket *); 135 #endif /* INET */ 136 137 extern struct protosw inetsw[]; 138 139 u_long rip_sendspace = 9216; 140 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 141 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 142 143 u_long rip_recvspace = 9216; 144 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 145 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 146 147 /* 148 * Hash functions 149 */ 150 151 #define INP_PCBHASH_RAW_SIZE 256 152 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 153 (((proto) + (laddr) + (faddr)) % (mask) + 1) 154 155 #ifdef INET 156 static void 157 rip_inshash(struct inpcb *inp) 158 { 159 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 160 struct inpcbhead *pcbhash; 161 int hash; 162 163 INP_INFO_WLOCK_ASSERT(pcbinfo); 164 INP_WLOCK_ASSERT(inp); 165 166 if (inp->inp_ip_p != 0 && 167 inp->inp_laddr.s_addr != INADDR_ANY && 168 inp->inp_faddr.s_addr != INADDR_ANY) { 169 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 170 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 171 } else 172 hash = 0; 173 pcbhash = &pcbinfo->ipi_hashbase[hash]; 174 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 175 } 176 177 static void 178 rip_delhash(struct inpcb *inp) 179 { 180 181 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 182 INP_WLOCK_ASSERT(inp); 183 184 CK_LIST_REMOVE(inp, inp_hash); 185 } 186 #endif /* INET */ 187 188 /* 189 * Raw interface to IP protocol. 190 */ 191 192 /* 193 * Initialize raw connection block q. 194 */ 195 static void 196 rip_zone_change(void *tag) 197 { 198 199 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 200 } 201 202 static int 203 rip_inpcb_init(void *mem, int size, int flags) 204 { 205 struct inpcb *inp = mem; 206 207 INP_LOCK_INIT(inp, "inp", "rawinp"); 208 return (0); 209 } 210 211 void 212 rip_init(void) 213 { 214 215 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, 216 1, "ripcb", rip_inpcb_init, IPI_HASHFIELDS_NONE); 217 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 218 EVENTHANDLER_PRI_ANY); 219 } 220 221 #ifdef VIMAGE 222 static void 223 rip_destroy(void *unused __unused) 224 { 225 226 in_pcbinfo_destroy(&V_ripcbinfo); 227 } 228 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL); 229 #endif 230 231 #ifdef INET 232 static int 233 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 234 struct sockaddr_in *ripsrc) 235 { 236 int policyfail = 0; 237 238 INP_LOCK_ASSERT(last); 239 240 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 241 /* check AH/ESP integrity. */ 242 if (IPSEC_ENABLED(ipv4)) { 243 if (IPSEC_CHECK_POLICY(ipv4, n, last) != 0) 244 policyfail = 1; 245 } 246 #endif /* IPSEC */ 247 #ifdef MAC 248 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 249 policyfail = 1; 250 #endif 251 /* Check the minimum TTL for socket. */ 252 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 253 policyfail = 1; 254 if (!policyfail) { 255 struct mbuf *opts = NULL; 256 struct socket *so; 257 258 so = last->inp_socket; 259 if ((last->inp_flags & INP_CONTROLOPTS) || 260 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 261 ip_savecontrol(last, &opts, ip, n); 262 SOCKBUF_LOCK(&so->so_rcv); 263 if (sbappendaddr_locked(&so->so_rcv, 264 (struct sockaddr *)ripsrc, n, opts) == 0) { 265 soroverflow_locked(so); 266 m_freem(n); 267 if (opts) 268 m_freem(opts); 269 } else 270 sorwakeup_locked(so); 271 } else 272 m_freem(n); 273 return (policyfail); 274 } 275 276 /* 277 * Setup generic address and protocol structures for raw_input routine, then 278 * pass them along with mbuf chain. 279 */ 280 int 281 rip_input(struct mbuf **mp, int *offp, int proto) 282 { 283 struct ifnet *ifp; 284 struct mbuf *m = *mp; 285 struct ip *ip = mtod(m, struct ip *); 286 struct inpcb *inp, *last; 287 struct sockaddr_in ripsrc; 288 int hash; 289 290 NET_EPOCH_ASSERT(); 291 292 *mp = NULL; 293 294 bzero(&ripsrc, sizeof(ripsrc)); 295 ripsrc.sin_len = sizeof(ripsrc); 296 ripsrc.sin_family = AF_INET; 297 ripsrc.sin_addr = ip->ip_src; 298 last = NULL; 299 300 ifp = m->m_pkthdr.rcvif; 301 302 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 303 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 304 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 305 if (inp->inp_ip_p != proto) 306 continue; 307 #ifdef INET6 308 /* XXX inp locking */ 309 if ((inp->inp_vflag & INP_IPV4) == 0) 310 continue; 311 #endif 312 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 313 continue; 314 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 315 continue; 316 if (last != NULL) { 317 struct mbuf *n; 318 319 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 320 if (n != NULL) 321 (void) rip_append(last, ip, n, &ripsrc); 322 /* XXX count dropped packet */ 323 INP_RUNLOCK(last); 324 last = NULL; 325 } 326 INP_RLOCK(inp); 327 if (__predict_false(inp->inp_flags2 & INP_FREED)) 328 goto skip_1; 329 if (jailed_without_vnet(inp->inp_cred)) { 330 /* 331 * XXX: If faddr was bound to multicast group, 332 * jailed raw socket will drop datagram. 333 */ 334 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 335 goto skip_1; 336 } 337 last = inp; 338 continue; 339 skip_1: 340 INP_RUNLOCK(inp); 341 } 342 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 343 if (inp->inp_ip_p && inp->inp_ip_p != proto) 344 continue; 345 #ifdef INET6 346 /* XXX inp locking */ 347 if ((inp->inp_vflag & INP_IPV4) == 0) 348 continue; 349 #endif 350 if (!in_nullhost(inp->inp_laddr) && 351 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 352 continue; 353 if (!in_nullhost(inp->inp_faddr) && 354 !in_hosteq(inp->inp_faddr, ip->ip_src)) 355 continue; 356 if (last != NULL) { 357 struct mbuf *n; 358 359 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 360 if (n != NULL) 361 (void) rip_append(last, ip, n, &ripsrc); 362 /* XXX count dropped packet */ 363 INP_RUNLOCK(last); 364 last = NULL; 365 } 366 INP_RLOCK(inp); 367 if (__predict_false(inp->inp_flags2 & INP_FREED)) 368 goto skip_2; 369 if (jailed_without_vnet(inp->inp_cred)) { 370 /* 371 * Allow raw socket in jail to receive multicast; 372 * assume process had PRIV_NETINET_RAW at attach, 373 * and fall through into normal filter path if so. 374 */ 375 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 376 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 377 goto skip_2; 378 } 379 /* 380 * If this raw socket has multicast state, and we 381 * have received a multicast, check if this socket 382 * should receive it, as multicast filtering is now 383 * the responsibility of the transport layer. 384 */ 385 if (inp->inp_moptions != NULL && 386 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 387 /* 388 * If the incoming datagram is for IGMP, allow it 389 * through unconditionally to the raw socket. 390 * 391 * In the case of IGMPv2, we may not have explicitly 392 * joined the group, and may have set IFF_ALLMULTI 393 * on the interface. imo_multi_filter() may discard 394 * control traffic we actually need to see. 395 * 396 * Userland multicast routing daemons should continue 397 * filter the control traffic appropriately. 398 */ 399 int blocked; 400 401 blocked = MCAST_PASS; 402 if (proto != IPPROTO_IGMP) { 403 struct sockaddr_in group; 404 405 bzero(&group, sizeof(struct sockaddr_in)); 406 group.sin_len = sizeof(struct sockaddr_in); 407 group.sin_family = AF_INET; 408 group.sin_addr = ip->ip_dst; 409 410 blocked = imo_multi_filter(inp->inp_moptions, 411 ifp, 412 (struct sockaddr *)&group, 413 (struct sockaddr *)&ripsrc); 414 } 415 416 if (blocked != MCAST_PASS) { 417 IPSTAT_INC(ips_notmember); 418 goto skip_2; 419 } 420 } 421 last = inp; 422 continue; 423 skip_2: 424 INP_RUNLOCK(inp); 425 } 426 if (last != NULL) { 427 if (rip_append(last, ip, m, &ripsrc) != 0) 428 IPSTAT_INC(ips_delivered); 429 INP_RUNLOCK(last); 430 } else { 431 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) { 432 IPSTAT_INC(ips_noproto); 433 IPSTAT_DEC(ips_delivered); 434 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0); 435 } else { 436 m_freem(m); 437 } 438 } 439 return (IPPROTO_DONE); 440 } 441 442 /* 443 * Generate IP header and pass packet to ip_output. Tack on options user may 444 * have setup with control call. 445 */ 446 int 447 rip_output(struct mbuf *m, struct socket *so, ...) 448 { 449 struct epoch_tracker et; 450 struct ip *ip; 451 int error; 452 struct inpcb *inp = sotoinpcb(so); 453 va_list ap; 454 u_long dst; 455 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 456 IP_ALLOWBROADCAST; 457 int cnt, hlen; 458 u_char opttype, optlen, *cp; 459 460 va_start(ap, so); 461 dst = va_arg(ap, u_long); 462 va_end(ap); 463 464 /* 465 * If the user handed us a complete IP packet, use it. Otherwise, 466 * allocate an mbuf for a header and fill it in. 467 */ 468 if ((inp->inp_flags & INP_HDRINCL) == 0) { 469 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 470 m_freem(m); 471 return(EMSGSIZE); 472 } 473 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 474 if (m == NULL) 475 return(ENOBUFS); 476 477 INP_RLOCK(inp); 478 ip = mtod(m, struct ip *); 479 ip->ip_tos = inp->inp_ip_tos; 480 if (inp->inp_flags & INP_DONTFRAG) 481 ip->ip_off = htons(IP_DF); 482 else 483 ip->ip_off = htons(0); 484 ip->ip_p = inp->inp_ip_p; 485 ip->ip_len = htons(m->m_pkthdr.len); 486 ip->ip_src = inp->inp_laddr; 487 ip->ip_dst.s_addr = dst; 488 #ifdef ROUTE_MPATH 489 if (CALC_FLOWID_OUTBOUND) { 490 uint32_t hash_type, hash_val; 491 492 hash_val = fib4_calc_software_hash(ip->ip_src, 493 ip->ip_dst, 0, 0, ip->ip_p, &hash_type); 494 m->m_pkthdr.flowid = hash_val; 495 M_HASHTYPE_SET(m, hash_type); 496 flags |= IP_NODEFAULTFLOWID; 497 } 498 #endif 499 if (jailed(inp->inp_cred)) { 500 /* 501 * prison_local_ip4() would be good enough but would 502 * let a source of INADDR_ANY pass, which we do not 503 * want to see from jails. 504 */ 505 if (ip->ip_src.s_addr == INADDR_ANY) { 506 NET_EPOCH_ENTER(et); 507 error = in_pcbladdr(inp, &ip->ip_dst, 508 &ip->ip_src, inp->inp_cred); 509 NET_EPOCH_EXIT(et); 510 } else { 511 error = prison_local_ip4(inp->inp_cred, 512 &ip->ip_src); 513 } 514 if (error != 0) { 515 INP_RUNLOCK(inp); 516 m_freem(m); 517 return (error); 518 } 519 } 520 ip->ip_ttl = inp->inp_ip_ttl; 521 } else { 522 if (m->m_pkthdr.len > IP_MAXPACKET) { 523 m_freem(m); 524 return (EMSGSIZE); 525 } 526 if (m->m_pkthdr.len < sizeof(*ip)) { 527 m_freem(m); 528 return (EINVAL); 529 } 530 m = m_pullup(m, sizeof(*ip)); 531 if (m == NULL) 532 return (ENOMEM); 533 ip = mtod(m, struct ip *); 534 hlen = ip->ip_hl << 2; 535 if (m->m_len < hlen) { 536 m = m_pullup(m, hlen); 537 if (m == NULL) 538 return (EINVAL); 539 ip = mtod(m, struct ip *); 540 } 541 #ifdef ROUTE_MPATH 542 if (CALC_FLOWID_OUTBOUND) { 543 uint32_t hash_type, hash_val; 544 545 hash_val = fib4_calc_software_hash(ip->ip_dst, 546 ip->ip_src, 0, 0, ip->ip_p, &hash_type); 547 m->m_pkthdr.flowid = hash_val; 548 M_HASHTYPE_SET(m, hash_type); 549 flags |= IP_NODEFAULTFLOWID; 550 } 551 #endif 552 INP_RLOCK(inp); 553 /* 554 * Don't allow both user specified and setsockopt options, 555 * and don't allow packet length sizes that will crash. 556 */ 557 if ((hlen < sizeof (*ip)) 558 || ((hlen > sizeof (*ip)) && inp->inp_options) 559 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) { 560 INP_RUNLOCK(inp); 561 m_freem(m); 562 return (EINVAL); 563 } 564 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 565 if (error != 0) { 566 INP_RUNLOCK(inp); 567 m_freem(m); 568 return (error); 569 } 570 /* 571 * Don't allow IP options which do not have the required 572 * structure as specified in section 3.1 of RFC 791 on 573 * pages 15-23. 574 */ 575 cp = (u_char *)(ip + 1); 576 cnt = hlen - sizeof (struct ip); 577 for (; cnt > 0; cnt -= optlen, cp += optlen) { 578 opttype = cp[IPOPT_OPTVAL]; 579 if (opttype == IPOPT_EOL) 580 break; 581 if (opttype == IPOPT_NOP) { 582 optlen = 1; 583 continue; 584 } 585 if (cnt < IPOPT_OLEN + sizeof(u_char)) { 586 INP_RUNLOCK(inp); 587 m_freem(m); 588 return (EINVAL); 589 } 590 optlen = cp[IPOPT_OLEN]; 591 if (optlen < IPOPT_OLEN + sizeof(u_char) || 592 optlen > cnt) { 593 INP_RUNLOCK(inp); 594 m_freem(m); 595 return (EINVAL); 596 } 597 } 598 /* 599 * This doesn't allow application to specify ID of zero, 600 * but we got this limitation from the beginning of history. 601 */ 602 if (ip->ip_id == 0) 603 ip_fillid(ip); 604 605 /* 606 * XXX prevent ip_output from overwriting header fields. 607 */ 608 flags |= IP_RAWOUTPUT; 609 IPSTAT_INC(ips_rawout); 610 } 611 612 if (inp->inp_flags & INP_ONESBCAST) 613 flags |= IP_SENDONES; 614 615 #ifdef MAC 616 mac_inpcb_create_mbuf(inp, m); 617 #endif 618 619 NET_EPOCH_ENTER(et); 620 error = ip_output(m, inp->inp_options, NULL, flags, 621 inp->inp_moptions, inp); 622 NET_EPOCH_EXIT(et); 623 INP_RUNLOCK(inp); 624 return (error); 625 } 626 627 /* 628 * Raw IP socket option processing. 629 * 630 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 631 * only be created by a privileged process, and as such, socket option 632 * operations to manage system properties on any raw socket were allowed to 633 * take place without explicit additional access control checks. However, 634 * raw sockets can now also be created in jail(), and therefore explicit 635 * checks are now required. Likewise, raw sockets can be used by a process 636 * after it gives up privilege, so some caution is required. For options 637 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 638 * performed in ip_ctloutput() and therefore no check occurs here. 639 * Unilaterally checking priv_check() here breaks normal IP socket option 640 * operations on raw sockets. 641 * 642 * When adding new socket options here, make sure to add access control 643 * checks here as necessary. 644 * 645 * XXX-BZ inp locking? 646 */ 647 int 648 rip_ctloutput(struct socket *so, struct sockopt *sopt) 649 { 650 struct inpcb *inp = sotoinpcb(so); 651 int error, optval; 652 653 if (sopt->sopt_level != IPPROTO_IP) { 654 if ((sopt->sopt_level == SOL_SOCKET) && 655 (sopt->sopt_name == SO_SETFIB)) { 656 inp->inp_inc.inc_fibnum = so->so_fibnum; 657 return (0); 658 } 659 return (EINVAL); 660 } 661 662 error = 0; 663 switch (sopt->sopt_dir) { 664 case SOPT_GET: 665 switch (sopt->sopt_name) { 666 case IP_HDRINCL: 667 optval = inp->inp_flags & INP_HDRINCL; 668 error = sooptcopyout(sopt, &optval, sizeof optval); 669 break; 670 671 case IP_FW3: /* generic ipfw v.3 functions */ 672 case IP_FW_ADD: /* ADD actually returns the body... */ 673 case IP_FW_GET: 674 case IP_FW_TABLE_GETSIZE: 675 case IP_FW_TABLE_LIST: 676 case IP_FW_NAT_GET_CONFIG: 677 case IP_FW_NAT_GET_LOG: 678 if (V_ip_fw_ctl_ptr != NULL) 679 error = V_ip_fw_ctl_ptr(sopt); 680 else 681 error = ENOPROTOOPT; 682 break; 683 684 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 685 case IP_DUMMYNET_GET: 686 if (ip_dn_ctl_ptr != NULL) 687 error = ip_dn_ctl_ptr(sopt); 688 else 689 error = ENOPROTOOPT; 690 break ; 691 692 case MRT_INIT: 693 case MRT_DONE: 694 case MRT_ADD_VIF: 695 case MRT_DEL_VIF: 696 case MRT_ADD_MFC: 697 case MRT_DEL_MFC: 698 case MRT_VERSION: 699 case MRT_ASSERT: 700 case MRT_API_SUPPORT: 701 case MRT_API_CONFIG: 702 case MRT_ADD_BW_UPCALL: 703 case MRT_DEL_BW_UPCALL: 704 error = priv_check(curthread, PRIV_NETINET_MROUTE); 705 if (error != 0) 706 return (error); 707 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 708 EOPNOTSUPP; 709 break; 710 711 default: 712 error = ip_ctloutput(so, sopt); 713 break; 714 } 715 break; 716 717 case SOPT_SET: 718 switch (sopt->sopt_name) { 719 case IP_HDRINCL: 720 error = sooptcopyin(sopt, &optval, sizeof optval, 721 sizeof optval); 722 if (error) 723 break; 724 if (optval) 725 inp->inp_flags |= INP_HDRINCL; 726 else 727 inp->inp_flags &= ~INP_HDRINCL; 728 break; 729 730 case IP_FW3: /* generic ipfw v.3 functions */ 731 case IP_FW_ADD: 732 case IP_FW_DEL: 733 case IP_FW_FLUSH: 734 case IP_FW_ZERO: 735 case IP_FW_RESETLOG: 736 case IP_FW_TABLE_ADD: 737 case IP_FW_TABLE_DEL: 738 case IP_FW_TABLE_FLUSH: 739 case IP_FW_NAT_CFG: 740 case IP_FW_NAT_DEL: 741 if (V_ip_fw_ctl_ptr != NULL) 742 error = V_ip_fw_ctl_ptr(sopt); 743 else 744 error = ENOPROTOOPT; 745 break; 746 747 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 748 case IP_DUMMYNET_CONFIGURE: 749 case IP_DUMMYNET_DEL: 750 case IP_DUMMYNET_FLUSH: 751 if (ip_dn_ctl_ptr != NULL) 752 error = ip_dn_ctl_ptr(sopt); 753 else 754 error = ENOPROTOOPT ; 755 break ; 756 757 case IP_RSVP_ON: 758 error = priv_check(curthread, PRIV_NETINET_MROUTE); 759 if (error != 0) 760 return (error); 761 error = ip_rsvp_init(so); 762 break; 763 764 case IP_RSVP_OFF: 765 error = priv_check(curthread, PRIV_NETINET_MROUTE); 766 if (error != 0) 767 return (error); 768 error = ip_rsvp_done(); 769 break; 770 771 case IP_RSVP_VIF_ON: 772 case IP_RSVP_VIF_OFF: 773 error = priv_check(curthread, PRIV_NETINET_MROUTE); 774 if (error != 0) 775 return (error); 776 error = ip_rsvp_vif ? 777 ip_rsvp_vif(so, sopt) : EINVAL; 778 break; 779 780 case MRT_INIT: 781 case MRT_DONE: 782 case MRT_ADD_VIF: 783 case MRT_DEL_VIF: 784 case MRT_ADD_MFC: 785 case MRT_DEL_MFC: 786 case MRT_VERSION: 787 case MRT_ASSERT: 788 case MRT_API_SUPPORT: 789 case MRT_API_CONFIG: 790 case MRT_ADD_BW_UPCALL: 791 case MRT_DEL_BW_UPCALL: 792 error = priv_check(curthread, PRIV_NETINET_MROUTE); 793 if (error != 0) 794 return (error); 795 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 796 EOPNOTSUPP; 797 break; 798 799 default: 800 error = ip_ctloutput(so, sopt); 801 break; 802 } 803 break; 804 } 805 806 return (error); 807 } 808 809 /* 810 * This function exists solely to receive the PRC_IFDOWN messages which are 811 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 812 * in_ifadown() to remove all routes corresponding to that address. It also 813 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 814 * routes. 815 */ 816 void 817 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 818 { 819 struct in_ifaddr *ia; 820 struct ifnet *ifp; 821 int err; 822 int flags; 823 824 NET_EPOCH_ASSERT(); 825 826 switch (cmd) { 827 case PRC_IFDOWN: 828 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 829 if (ia->ia_ifa.ifa_addr == sa 830 && (ia->ia_flags & IFA_ROUTE)) { 831 ifa_ref(&ia->ia_ifa); 832 /* 833 * in_scrubprefix() kills the interface route. 834 */ 835 in_scrubprefix(ia, 0); 836 /* 837 * in_ifadown gets rid of all the rest of the 838 * routes. This is not quite the right thing 839 * to do, but at least if we are running a 840 * routing process they will come back. 841 */ 842 in_ifadown(&ia->ia_ifa, 0); 843 ifa_free(&ia->ia_ifa); 844 break; 845 } 846 } 847 break; 848 849 case PRC_IFUP: 850 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 851 if (ia->ia_ifa.ifa_addr == sa) 852 break; 853 } 854 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) 855 return; 856 ifa_ref(&ia->ia_ifa); 857 flags = RTF_UP; 858 ifp = ia->ia_ifa.ifa_ifp; 859 860 if ((ifp->if_flags & IFF_LOOPBACK) 861 || (ifp->if_flags & IFF_POINTOPOINT)) 862 flags |= RTF_HOST; 863 864 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 865 866 rt_addrmsg(RTM_ADD, &ia->ia_ifa, ia->ia_ifp->if_fib); 867 err = in_handle_ifaddr_route(RTM_ADD, ia); 868 if (err == 0) 869 ia->ia_flags |= IFA_ROUTE; 870 871 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 872 873 ifa_free(&ia->ia_ifa); 874 break; 875 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 876 case PRC_MSGSIZE: 877 if (IPSEC_ENABLED(ipv4)) 878 IPSEC_CTLINPUT(ipv4, cmd, sa, vip); 879 break; 880 #endif 881 } 882 } 883 884 static int 885 rip_attach(struct socket *so, int proto, struct thread *td) 886 { 887 struct inpcb *inp; 888 int error; 889 890 inp = sotoinpcb(so); 891 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 892 893 error = priv_check(td, PRIV_NETINET_RAW); 894 if (error) 895 return (error); 896 if (proto >= IPPROTO_MAX || proto < 0) 897 return EPROTONOSUPPORT; 898 error = soreserve(so, rip_sendspace, rip_recvspace); 899 if (error) 900 return (error); 901 INP_INFO_WLOCK(&V_ripcbinfo); 902 error = in_pcballoc(so, &V_ripcbinfo); 903 if (error) { 904 INP_INFO_WUNLOCK(&V_ripcbinfo); 905 return (error); 906 } 907 inp = (struct inpcb *)so->so_pcb; 908 inp->inp_vflag |= INP_IPV4; 909 inp->inp_ip_p = proto; 910 inp->inp_ip_ttl = V_ip_defttl; 911 rip_inshash(inp); 912 INP_INFO_WUNLOCK(&V_ripcbinfo); 913 INP_WUNLOCK(inp); 914 return (0); 915 } 916 917 static void 918 rip_detach(struct socket *so) 919 { 920 struct inpcb *inp; 921 922 inp = sotoinpcb(so); 923 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 924 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 925 ("rip_detach: not closed")); 926 927 INP_INFO_WLOCK(&V_ripcbinfo); 928 INP_WLOCK(inp); 929 rip_delhash(inp); 930 if (so == V_ip_mrouter && ip_mrouter_done) 931 ip_mrouter_done(); 932 if (ip_rsvp_force_done) 933 ip_rsvp_force_done(so); 934 if (so == V_ip_rsvpd) 935 ip_rsvp_done(); 936 in_pcbdetach(inp); 937 in_pcbfree(inp); 938 INP_INFO_WUNLOCK(&V_ripcbinfo); 939 } 940 941 static void 942 rip_dodisconnect(struct socket *so, struct inpcb *inp) 943 { 944 struct inpcbinfo *pcbinfo; 945 946 pcbinfo = inp->inp_pcbinfo; 947 INP_INFO_WLOCK(pcbinfo); 948 INP_WLOCK(inp); 949 rip_delhash(inp); 950 inp->inp_faddr.s_addr = INADDR_ANY; 951 rip_inshash(inp); 952 SOCK_LOCK(so); 953 so->so_state &= ~SS_ISCONNECTED; 954 SOCK_UNLOCK(so); 955 INP_WUNLOCK(inp); 956 INP_INFO_WUNLOCK(pcbinfo); 957 } 958 959 static void 960 rip_abort(struct socket *so) 961 { 962 struct inpcb *inp; 963 964 inp = sotoinpcb(so); 965 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 966 967 rip_dodisconnect(so, inp); 968 } 969 970 static void 971 rip_close(struct socket *so) 972 { 973 struct inpcb *inp; 974 975 inp = sotoinpcb(so); 976 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 977 978 rip_dodisconnect(so, inp); 979 } 980 981 static int 982 rip_disconnect(struct socket *so) 983 { 984 struct inpcb *inp; 985 986 if ((so->so_state & SS_ISCONNECTED) == 0) 987 return (ENOTCONN); 988 989 inp = sotoinpcb(so); 990 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 991 992 rip_dodisconnect(so, inp); 993 return (0); 994 } 995 996 static int 997 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 998 { 999 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 1000 struct inpcb *inp; 1001 int error; 1002 1003 if (nam->sa_family != AF_INET) 1004 return (EAFNOSUPPORT); 1005 if (nam->sa_len != sizeof(*addr)) 1006 return (EINVAL); 1007 1008 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 1009 if (error != 0) 1010 return (error); 1011 1012 inp = sotoinpcb(so); 1013 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 1014 1015 if (CK_STAILQ_EMPTY(&V_ifnet) || 1016 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 1017 (addr->sin_addr.s_addr && 1018 (inp->inp_flags & INP_BINDANY) == 0 && 1019 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 1020 return (EADDRNOTAVAIL); 1021 1022 INP_INFO_WLOCK(&V_ripcbinfo); 1023 INP_WLOCK(inp); 1024 rip_delhash(inp); 1025 inp->inp_laddr = addr->sin_addr; 1026 rip_inshash(inp); 1027 INP_WUNLOCK(inp); 1028 INP_INFO_WUNLOCK(&V_ripcbinfo); 1029 return (0); 1030 } 1031 1032 static int 1033 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1034 { 1035 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 1036 struct inpcb *inp; 1037 1038 if (nam->sa_len != sizeof(*addr)) 1039 return (EINVAL); 1040 if (CK_STAILQ_EMPTY(&V_ifnet)) 1041 return (EADDRNOTAVAIL); 1042 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 1043 return (EAFNOSUPPORT); 1044 1045 inp = sotoinpcb(so); 1046 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 1047 1048 INP_INFO_WLOCK(&V_ripcbinfo); 1049 INP_WLOCK(inp); 1050 rip_delhash(inp); 1051 inp->inp_faddr = addr->sin_addr; 1052 rip_inshash(inp); 1053 soisconnected(so); 1054 INP_WUNLOCK(inp); 1055 INP_INFO_WUNLOCK(&V_ripcbinfo); 1056 return (0); 1057 } 1058 1059 static int 1060 rip_shutdown(struct socket *so) 1061 { 1062 struct inpcb *inp; 1063 1064 inp = sotoinpcb(so); 1065 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 1066 1067 INP_WLOCK(inp); 1068 socantsendmore(so); 1069 INP_WUNLOCK(inp); 1070 return (0); 1071 } 1072 1073 static int 1074 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 1075 struct mbuf *control, struct thread *td) 1076 { 1077 struct inpcb *inp; 1078 u_long dst; 1079 int error; 1080 1081 inp = sotoinpcb(so); 1082 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 1083 1084 if (control != NULL) { 1085 m_freem(control); 1086 control = NULL; 1087 } 1088 1089 /* 1090 * Note: 'dst' reads below are unlocked. 1091 */ 1092 if (so->so_state & SS_ISCONNECTED) { 1093 if (nam) { 1094 error = EISCONN; 1095 goto release; 1096 } 1097 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 1098 } else { 1099 error = 0; 1100 if (nam == NULL) 1101 error = ENOTCONN; 1102 else if (nam->sa_family != AF_INET) 1103 error = EAFNOSUPPORT; 1104 else if (nam->sa_len != sizeof(struct sockaddr_in)) 1105 error = EINVAL; 1106 if (error != 0) 1107 goto release; 1108 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1109 } 1110 return (rip_output(m, so, dst)); 1111 1112 release: 1113 m_freem(m); 1114 return (error); 1115 } 1116 #endif /* INET */ 1117 1118 static int 1119 rip_pcblist(SYSCTL_HANDLER_ARGS) 1120 { 1121 struct xinpgen xig; 1122 struct epoch_tracker et; 1123 struct inpcb *inp; 1124 int error; 1125 1126 if (req->newptr != 0) 1127 return (EPERM); 1128 1129 if (req->oldptr == 0) { 1130 int n; 1131 1132 n = V_ripcbinfo.ipi_count; 1133 n += imax(n / 8, 10); 1134 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1135 return (0); 1136 } 1137 1138 if ((error = sysctl_wire_old_buffer(req, 0)) != 0) 1139 return (error); 1140 1141 bzero(&xig, sizeof(xig)); 1142 xig.xig_len = sizeof xig; 1143 xig.xig_count = V_ripcbinfo.ipi_count; 1144 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1145 xig.xig_sogen = so_gencnt; 1146 error = SYSCTL_OUT(req, &xig, sizeof xig); 1147 if (error) 1148 return (error); 1149 1150 NET_EPOCH_ENTER(et); 1151 for (inp = CK_LIST_FIRST(V_ripcbinfo.ipi_listhead); 1152 inp != NULL; 1153 inp = CK_LIST_NEXT(inp, inp_list)) { 1154 INP_RLOCK(inp); 1155 if (inp->inp_gencnt <= xig.xig_gen && 1156 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1157 struct xinpcb xi; 1158 1159 in_pcbtoxinpcb(inp, &xi); 1160 INP_RUNLOCK(inp); 1161 error = SYSCTL_OUT(req, &xi, sizeof xi); 1162 if (error) 1163 break; 1164 } else 1165 INP_RUNLOCK(inp); 1166 } 1167 NET_EPOCH_EXIT(et); 1168 1169 if (!error) { 1170 /* 1171 * Give the user an updated idea of our state. If the 1172 * generation differs from what we told her before, she knows 1173 * that something happened while we were processing this 1174 * request, and it might be necessary to retry. 1175 */ 1176 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1177 xig.xig_sogen = so_gencnt; 1178 xig.xig_count = V_ripcbinfo.ipi_count; 1179 error = SYSCTL_OUT(req, &xig, sizeof xig); 1180 } 1181 1182 return (error); 1183 } 1184 1185 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1186 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1187 rip_pcblist, "S,xinpcb", 1188 "List of active raw IP sockets"); 1189 1190 #ifdef INET 1191 struct pr_usrreqs rip_usrreqs = { 1192 .pru_abort = rip_abort, 1193 .pru_attach = rip_attach, 1194 .pru_bind = rip_bind, 1195 .pru_connect = rip_connect, 1196 .pru_control = in_control, 1197 .pru_detach = rip_detach, 1198 .pru_disconnect = rip_disconnect, 1199 .pru_peeraddr = in_getpeeraddr, 1200 .pru_send = rip_send, 1201 .pru_shutdown = rip_shutdown, 1202 .pru_sockaddr = in_getsockaddr, 1203 .pru_sosetlabel = in_pcbsosetlabel, 1204 .pru_close = rip_close, 1205 }; 1206 #endif /* INET */ 1207