Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/raw_ip.c
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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 42 #include <sys/param.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/eventhandler.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/protosw.h> 52 #include <sys/rmlock.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/vnet.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_systm.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 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 inpcbhead, ripcb); 89 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 90 91 #define V_ripcb VNET(ripcb) 92 #define V_ripcbinfo VNET(ripcbinfo) 93 94 /* 95 * Control and data hooks for ipfw, dummynet, divert and so on. 96 * The data hooks are not used here but it is convenient 97 * to keep them all in one place. 98 */ 99 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 100 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 101 102 int (*ip_dn_ctl_ptr)(struct sockopt *); 103 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 104 void (*ip_divert_ptr)(struct mbuf *, int); 105 int (*ng_ipfw_input_p)(struct mbuf **, int, 106 struct ip_fw_args *, int); 107 108 #ifdef INET 109 /* 110 * Hooks for multicast routing. They all default to NULL, so leave them not 111 * initialized and rely on BSS being set to 0. 112 */ 113 114 /* 115 * The socket used to communicate with the multicast routing daemon. 116 */ 117 VNET_DEFINE(struct socket *, ip_mrouter); 118 119 /* 120 * The various mrouter and rsvp functions. 121 */ 122 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 123 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 124 int (*ip_mrouter_done)(void); 125 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 126 struct ip_moptions *); 127 int (*mrt_ioctl)(u_long, caddr_t, int); 128 int (*legal_vif_num)(int); 129 u_long (*ip_mcast_src)(int); 130 131 int (*rsvp_input_p)(struct mbuf **, int *, int); 132 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 133 void (*ip_rsvp_force_done)(struct socket *); 134 #endif /* INET */ 135 136 extern struct protosw inetsw[]; 137 138 u_long rip_sendspace = 9216; 139 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 140 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 141 142 u_long rip_recvspace = 9216; 143 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 144 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 145 146 /* 147 * Hash functions 148 */ 149 150 #define INP_PCBHASH_RAW_SIZE 256 151 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 152 (((proto) + (laddr) + (faddr)) % (mask) + 1) 153 154 #ifdef INET 155 static void 156 rip_inshash(struct inpcb *inp) 157 { 158 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 159 struct inpcbhead *pcbhash; 160 int hash; 161 162 INP_INFO_WLOCK_ASSERT(pcbinfo); 163 INP_WLOCK_ASSERT(inp); 164 165 if (inp->inp_ip_p != 0 && 166 inp->inp_laddr.s_addr != INADDR_ANY && 167 inp->inp_faddr.s_addr != INADDR_ANY) { 168 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 169 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 170 } else 171 hash = 0; 172 pcbhash = &pcbinfo->ipi_hashbase[hash]; 173 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 174 } 175 176 static void 177 rip_delhash(struct inpcb *inp) 178 { 179 180 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 181 INP_WLOCK_ASSERT(inp); 182 183 CK_LIST_REMOVE(inp, inp_hash); 184 } 185 #endif /* INET */ 186 187 /* 188 * Raw interface to IP protocol. 189 */ 190 191 /* 192 * Initialize raw connection block q. 193 */ 194 static void 195 rip_zone_change(void *tag) 196 { 197 198 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 199 } 200 201 static int 202 rip_inpcb_init(void *mem, int size, int flags) 203 { 204 struct inpcb *inp = mem; 205 206 INP_LOCK_INIT(inp, "inp", "rawinp"); 207 return (0); 208 } 209 210 void 211 rip_init(void) 212 { 213 214 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, 215 1, "ripcb", rip_inpcb_init, IPI_HASHFIELDS_NONE); 216 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 217 EVENTHANDLER_PRI_ANY); 218 } 219 220 #ifdef VIMAGE 221 static void 222 rip_destroy(void *unused __unused) 223 { 224 225 in_pcbinfo_destroy(&V_ripcbinfo); 226 } 227 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL); 228 #endif 229 230 #ifdef INET 231 static int 232 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 233 struct sockaddr_in *ripsrc) 234 { 235 int policyfail = 0; 236 237 INP_LOCK_ASSERT(last); 238 239 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 240 /* check AH/ESP integrity. */ 241 if (IPSEC_ENABLED(ipv4)) { 242 if (IPSEC_CHECK_POLICY(ipv4, n, last) != 0) 243 policyfail = 1; 244 } 245 #endif /* IPSEC */ 246 #ifdef MAC 247 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 248 policyfail = 1; 249 #endif 250 /* Check the minimum TTL for socket. */ 251 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 252 policyfail = 1; 253 if (!policyfail) { 254 struct mbuf *opts = NULL; 255 struct socket *so; 256 257 so = last->inp_socket; 258 if ((last->inp_flags & INP_CONTROLOPTS) || 259 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 260 ip_savecontrol(last, &opts, ip, n); 261 SOCKBUF_LOCK(&so->so_rcv); 262 if (sbappendaddr_locked(&so->so_rcv, 263 (struct sockaddr *)ripsrc, n, opts) == 0) { 264 soroverflow_locked(so); 265 m_freem(n); 266 if (opts) 267 m_freem(opts); 268 } else 269 sorwakeup_locked(so); 270 } else 271 m_freem(n); 272 return (policyfail); 273 } 274 275 /* 276 * Setup generic address and protocol structures for raw_input routine, then 277 * pass them along with mbuf chain. 278 */ 279 int 280 rip_input(struct mbuf **mp, int *offp, int proto) 281 { 282 struct ifnet *ifp; 283 struct mbuf *m = *mp; 284 struct ip *ip = mtod(m, struct ip *); 285 struct inpcb *inp, *last; 286 struct sockaddr_in ripsrc; 287 struct epoch_tracker et; 288 int hash; 289 290 *mp = NULL; 291 292 bzero(&ripsrc, sizeof(ripsrc)); 293 ripsrc.sin_len = sizeof(ripsrc); 294 ripsrc.sin_family = AF_INET; 295 ripsrc.sin_addr = ip->ip_src; 296 last = NULL; 297 298 ifp = m->m_pkthdr.rcvif; 299 300 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 301 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 302 INP_INFO_RLOCK_ET(&V_ripcbinfo, et); 303 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 304 if (inp->inp_ip_p != proto) 305 continue; 306 #ifdef INET6 307 /* XXX inp locking */ 308 if ((inp->inp_vflag & INP_IPV4) == 0) 309 continue; 310 #endif 311 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 312 continue; 313 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 314 continue; 315 if (last != NULL) { 316 struct mbuf *n; 317 318 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 319 if (n != NULL) 320 (void) rip_append(last, ip, n, &ripsrc); 321 /* XXX count dropped packet */ 322 INP_RUNLOCK(last); 323 last = NULL; 324 } 325 INP_RLOCK(inp); 326 if (__predict_false(inp->inp_flags2 & INP_FREED)) 327 goto skip_1; 328 if (jailed_without_vnet(inp->inp_cred)) { 329 /* 330 * XXX: If faddr was bound to multicast group, 331 * jailed raw socket will drop datagram. 332 */ 333 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 334 goto skip_1; 335 } 336 last = inp; 337 continue; 338 skip_1: 339 INP_RUNLOCK(inp); 340 } 341 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 342 if (inp->inp_ip_p && inp->inp_ip_p != proto) 343 continue; 344 #ifdef INET6 345 /* XXX inp locking */ 346 if ((inp->inp_vflag & INP_IPV4) == 0) 347 continue; 348 #endif 349 if (!in_nullhost(inp->inp_laddr) && 350 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 351 continue; 352 if (!in_nullhost(inp->inp_faddr) && 353 !in_hosteq(inp->inp_faddr, ip->ip_src)) 354 continue; 355 if (last != NULL) { 356 struct mbuf *n; 357 358 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 359 if (n != NULL) 360 (void) rip_append(last, ip, n, &ripsrc); 361 /* XXX count dropped packet */ 362 INP_RUNLOCK(last); 363 last = NULL; 364 } 365 INP_RLOCK(inp); 366 if (__predict_false(inp->inp_flags2 & INP_FREED)) 367 goto skip_2; 368 if (jailed_without_vnet(inp->inp_cred)) { 369 /* 370 * Allow raw socket in jail to receive multicast; 371 * assume process had PRIV_NETINET_RAW at attach, 372 * and fall through into normal filter path if so. 373 */ 374 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 375 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 376 goto skip_2; 377 } 378 /* 379 * If this raw socket has multicast state, and we 380 * have received a multicast, check if this socket 381 * should receive it, as multicast filtering is now 382 * the responsibility of the transport layer. 383 */ 384 if (inp->inp_moptions != NULL && 385 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 386 /* 387 * If the incoming datagram is for IGMP, allow it 388 * through unconditionally to the raw socket. 389 * 390 * In the case of IGMPv2, we may not have explicitly 391 * joined the group, and may have set IFF_ALLMULTI 392 * on the interface. imo_multi_filter() may discard 393 * control traffic we actually need to see. 394 * 395 * Userland multicast routing daemons should continue 396 * filter the control traffic appropriately. 397 */ 398 int blocked; 399 400 blocked = MCAST_PASS; 401 if (proto != IPPROTO_IGMP) { 402 struct sockaddr_in group; 403 404 bzero(&group, sizeof(struct sockaddr_in)); 405 group.sin_len = sizeof(struct sockaddr_in); 406 group.sin_family = AF_INET; 407 group.sin_addr = ip->ip_dst; 408 409 blocked = imo_multi_filter(inp->inp_moptions, 410 ifp, 411 (struct sockaddr *)&group, 412 (struct sockaddr *)&ripsrc); 413 } 414 415 if (blocked != MCAST_PASS) { 416 IPSTAT_INC(ips_notmember); 417 goto skip_2; 418 } 419 } 420 last = inp; 421 continue; 422 skip_2: 423 INP_RUNLOCK(inp); 424 } 425 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et); 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 ip *ip; 450 int error; 451 struct inpcb *inp = sotoinpcb(so); 452 va_list ap; 453 u_long dst; 454 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 455 IP_ALLOWBROADCAST; 456 int cnt, hlen; 457 u_char opttype, optlen, *cp; 458 459 va_start(ap, so); 460 dst = va_arg(ap, u_long); 461 va_end(ap); 462 463 /* 464 * If the user handed us a complete IP packet, use it. Otherwise, 465 * allocate an mbuf for a header and fill it in. 466 */ 467 if ((inp->inp_flags & INP_HDRINCL) == 0) { 468 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 469 m_freem(m); 470 return(EMSGSIZE); 471 } 472 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 473 if (m == NULL) 474 return(ENOBUFS); 475 476 INP_RLOCK(inp); 477 ip = mtod(m, struct ip *); 478 ip->ip_tos = inp->inp_ip_tos; 479 if (inp->inp_flags & INP_DONTFRAG) 480 ip->ip_off = htons(IP_DF); 481 else 482 ip->ip_off = htons(0); 483 ip->ip_p = inp->inp_ip_p; 484 ip->ip_len = htons(m->m_pkthdr.len); 485 ip->ip_src = inp->inp_laddr; 486 ip->ip_dst.s_addr = dst; 487 if (jailed(inp->inp_cred)) { 488 /* 489 * prison_local_ip4() would be good enough but would 490 * let a source of INADDR_ANY pass, which we do not 491 * want to see from jails. 492 */ 493 if (ip->ip_src.s_addr == INADDR_ANY) { 494 error = in_pcbladdr(inp, &ip->ip_dst, &ip->ip_src, 495 inp->inp_cred); 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 } 527 528 INP_RLOCK(inp); 529 /* 530 * Don't allow both user specified and setsockopt options, 531 * and don't allow packet length sizes that will crash. 532 */ 533 if ((hlen < sizeof (*ip)) 534 || ((hlen > sizeof (*ip)) && inp->inp_options) 535 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) { 536 INP_RUNLOCK(inp); 537 m_freem(m); 538 return (EINVAL); 539 } 540 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 541 if (error != 0) { 542 INP_RUNLOCK(inp); 543 m_freem(m); 544 return (error); 545 } 546 /* 547 * Don't allow IP options which do not have the required 548 * structure as specified in section 3.1 of RFC 791 on 549 * pages 15-23. 550 */ 551 cp = (u_char *)(ip + 1); 552 cnt = hlen - sizeof (struct ip); 553 for (; cnt > 0; cnt -= optlen, cp += optlen) { 554 opttype = cp[IPOPT_OPTVAL]; 555 if (opttype == IPOPT_EOL) 556 break; 557 if (opttype == IPOPT_NOP) { 558 optlen = 1; 559 continue; 560 } 561 if (cnt < IPOPT_OLEN + sizeof(u_char)) { 562 INP_RUNLOCK(inp); 563 m_freem(m); 564 return (EINVAL); 565 } 566 optlen = cp[IPOPT_OLEN]; 567 if (optlen < IPOPT_OLEN + sizeof(u_char) || 568 optlen > cnt) { 569 INP_RUNLOCK(inp); 570 m_freem(m); 571 return (EINVAL); 572 } 573 } 574 /* 575 * This doesn't allow application to specify ID of zero, 576 * but we got this limitation from the beginning of history. 577 */ 578 if (ip->ip_id == 0) 579 ip_fillid(ip); 580 581 /* 582 * XXX prevent ip_output from overwriting header fields. 583 */ 584 flags |= IP_RAWOUTPUT; 585 IPSTAT_INC(ips_rawout); 586 } 587 588 if (inp->inp_flags & INP_ONESBCAST) 589 flags |= IP_SENDONES; 590 591 #ifdef MAC 592 mac_inpcb_create_mbuf(inp, m); 593 #endif 594 595 error = ip_output(m, inp->inp_options, NULL, flags, 596 inp->inp_moptions, inp); 597 INP_RUNLOCK(inp); 598 return (error); 599 } 600 601 /* 602 * Raw IP socket option processing. 603 * 604 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 605 * only be created by a privileged process, and as such, socket option 606 * operations to manage system properties on any raw socket were allowed to 607 * take place without explicit additional access control checks. However, 608 * raw sockets can now also be created in jail(), and therefore explicit 609 * checks are now required. Likewise, raw sockets can be used by a process 610 * after it gives up privilege, so some caution is required. For options 611 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 612 * performed in ip_ctloutput() and therefore no check occurs here. 613 * Unilaterally checking priv_check() here breaks normal IP socket option 614 * operations on raw sockets. 615 * 616 * When adding new socket options here, make sure to add access control 617 * checks here as necessary. 618 * 619 * XXX-BZ inp locking? 620 */ 621 int 622 rip_ctloutput(struct socket *so, struct sockopt *sopt) 623 { 624 struct inpcb *inp = sotoinpcb(so); 625 int error, optval; 626 627 if (sopt->sopt_level != IPPROTO_IP) { 628 if ((sopt->sopt_level == SOL_SOCKET) && 629 (sopt->sopt_name == SO_SETFIB)) { 630 inp->inp_inc.inc_fibnum = so->so_fibnum; 631 return (0); 632 } 633 return (EINVAL); 634 } 635 636 error = 0; 637 switch (sopt->sopt_dir) { 638 case SOPT_GET: 639 switch (sopt->sopt_name) { 640 case IP_HDRINCL: 641 optval = inp->inp_flags & INP_HDRINCL; 642 error = sooptcopyout(sopt, &optval, sizeof optval); 643 break; 644 645 case IP_FW3: /* generic ipfw v.3 functions */ 646 case IP_FW_ADD: /* ADD actually returns the body... */ 647 case IP_FW_GET: 648 case IP_FW_TABLE_GETSIZE: 649 case IP_FW_TABLE_LIST: 650 case IP_FW_NAT_GET_CONFIG: 651 case IP_FW_NAT_GET_LOG: 652 if (V_ip_fw_ctl_ptr != NULL) 653 error = V_ip_fw_ctl_ptr(sopt); 654 else 655 error = ENOPROTOOPT; 656 break; 657 658 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 659 case IP_DUMMYNET_GET: 660 if (ip_dn_ctl_ptr != NULL) 661 error = ip_dn_ctl_ptr(sopt); 662 else 663 error = ENOPROTOOPT; 664 break ; 665 666 case MRT_INIT: 667 case MRT_DONE: 668 case MRT_ADD_VIF: 669 case MRT_DEL_VIF: 670 case MRT_ADD_MFC: 671 case MRT_DEL_MFC: 672 case MRT_VERSION: 673 case MRT_ASSERT: 674 case MRT_API_SUPPORT: 675 case MRT_API_CONFIG: 676 case MRT_ADD_BW_UPCALL: 677 case MRT_DEL_BW_UPCALL: 678 error = priv_check(curthread, PRIV_NETINET_MROUTE); 679 if (error != 0) 680 return (error); 681 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 682 EOPNOTSUPP; 683 break; 684 685 default: 686 error = ip_ctloutput(so, sopt); 687 break; 688 } 689 break; 690 691 case SOPT_SET: 692 switch (sopt->sopt_name) { 693 case IP_HDRINCL: 694 error = sooptcopyin(sopt, &optval, sizeof optval, 695 sizeof optval); 696 if (error) 697 break; 698 if (optval) 699 inp->inp_flags |= INP_HDRINCL; 700 else 701 inp->inp_flags &= ~INP_HDRINCL; 702 break; 703 704 case IP_FW3: /* generic ipfw v.3 functions */ 705 case IP_FW_ADD: 706 case IP_FW_DEL: 707 case IP_FW_FLUSH: 708 case IP_FW_ZERO: 709 case IP_FW_RESETLOG: 710 case IP_FW_TABLE_ADD: 711 case IP_FW_TABLE_DEL: 712 case IP_FW_TABLE_FLUSH: 713 case IP_FW_NAT_CFG: 714 case IP_FW_NAT_DEL: 715 if (V_ip_fw_ctl_ptr != NULL) 716 error = V_ip_fw_ctl_ptr(sopt); 717 else 718 error = ENOPROTOOPT; 719 break; 720 721 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 722 case IP_DUMMYNET_CONFIGURE: 723 case IP_DUMMYNET_DEL: 724 case IP_DUMMYNET_FLUSH: 725 if (ip_dn_ctl_ptr != NULL) 726 error = ip_dn_ctl_ptr(sopt); 727 else 728 error = ENOPROTOOPT ; 729 break ; 730 731 case IP_RSVP_ON: 732 error = priv_check(curthread, PRIV_NETINET_MROUTE); 733 if (error != 0) 734 return (error); 735 error = ip_rsvp_init(so); 736 break; 737 738 case IP_RSVP_OFF: 739 error = priv_check(curthread, PRIV_NETINET_MROUTE); 740 if (error != 0) 741 return (error); 742 error = ip_rsvp_done(); 743 break; 744 745 case IP_RSVP_VIF_ON: 746 case IP_RSVP_VIF_OFF: 747 error = priv_check(curthread, PRIV_NETINET_MROUTE); 748 if (error != 0) 749 return (error); 750 error = ip_rsvp_vif ? 751 ip_rsvp_vif(so, sopt) : EINVAL; 752 break; 753 754 case MRT_INIT: 755 case MRT_DONE: 756 case MRT_ADD_VIF: 757 case MRT_DEL_VIF: 758 case MRT_ADD_MFC: 759 case MRT_DEL_MFC: 760 case MRT_VERSION: 761 case MRT_ASSERT: 762 case MRT_API_SUPPORT: 763 case MRT_API_CONFIG: 764 case MRT_ADD_BW_UPCALL: 765 case MRT_DEL_BW_UPCALL: 766 error = priv_check(curthread, PRIV_NETINET_MROUTE); 767 if (error != 0) 768 return (error); 769 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 770 EOPNOTSUPP; 771 break; 772 773 default: 774 error = ip_ctloutput(so, sopt); 775 break; 776 } 777 break; 778 } 779 780 return (error); 781 } 782 783 /* 784 * This function exists solely to receive the PRC_IFDOWN messages which are 785 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 786 * in_ifadown() to remove all routes corresponding to that address. It also 787 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 788 * routes. 789 */ 790 void 791 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 792 { 793 struct rm_priotracker in_ifa_tracker; 794 struct in_ifaddr *ia; 795 struct ifnet *ifp; 796 int err; 797 int flags; 798 799 switch (cmd) { 800 case PRC_IFDOWN: 801 IN_IFADDR_RLOCK(&in_ifa_tracker); 802 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 803 if (ia->ia_ifa.ifa_addr == sa 804 && (ia->ia_flags & IFA_ROUTE)) { 805 ifa_ref(&ia->ia_ifa); 806 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 807 /* 808 * in_scrubprefix() kills the interface route. 809 */ 810 in_scrubprefix(ia, 0); 811 /* 812 * in_ifadown gets rid of all the rest of the 813 * routes. This is not quite the right thing 814 * to do, but at least if we are running a 815 * routing process they will come back. 816 */ 817 in_ifadown(&ia->ia_ifa, 0); 818 ifa_free(&ia->ia_ifa); 819 break; 820 } 821 } 822 if (ia == NULL) /* If ia matched, already unlocked. */ 823 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 824 break; 825 826 case PRC_IFUP: 827 IN_IFADDR_RLOCK(&in_ifa_tracker); 828 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 829 if (ia->ia_ifa.ifa_addr == sa) 830 break; 831 } 832 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { 833 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 834 return; 835 } 836 ifa_ref(&ia->ia_ifa); 837 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 838 flags = RTF_UP; 839 ifp = ia->ia_ifa.ifa_ifp; 840 841 if ((ifp->if_flags & IFF_LOOPBACK) 842 || (ifp->if_flags & IFF_POINTOPOINT)) 843 flags |= RTF_HOST; 844 845 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 846 847 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 848 if (err == 0) 849 ia->ia_flags |= IFA_ROUTE; 850 851 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 852 853 ifa_free(&ia->ia_ifa); 854 break; 855 } 856 } 857 858 static int 859 rip_attach(struct socket *so, int proto, struct thread *td) 860 { 861 struct inpcb *inp; 862 int error; 863 864 inp = sotoinpcb(so); 865 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 866 867 error = priv_check(td, PRIV_NETINET_RAW); 868 if (error) 869 return (error); 870 if (proto >= IPPROTO_MAX || proto < 0) 871 return EPROTONOSUPPORT; 872 error = soreserve(so, rip_sendspace, rip_recvspace); 873 if (error) 874 return (error); 875 INP_INFO_WLOCK(&V_ripcbinfo); 876 error = in_pcballoc(so, &V_ripcbinfo); 877 if (error) { 878 INP_INFO_WUNLOCK(&V_ripcbinfo); 879 return (error); 880 } 881 inp = (struct inpcb *)so->so_pcb; 882 inp->inp_vflag |= INP_IPV4; 883 inp->inp_ip_p = proto; 884 inp->inp_ip_ttl = V_ip_defttl; 885 rip_inshash(inp); 886 INP_INFO_WUNLOCK(&V_ripcbinfo); 887 INP_WUNLOCK(inp); 888 return (0); 889 } 890 891 static void 892 rip_detach(struct socket *so) 893 { 894 struct inpcb *inp; 895 896 inp = sotoinpcb(so); 897 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 898 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 899 ("rip_detach: not closed")); 900 901 INP_INFO_WLOCK(&V_ripcbinfo); 902 INP_WLOCK(inp); 903 rip_delhash(inp); 904 if (so == V_ip_mrouter && ip_mrouter_done) 905 ip_mrouter_done(); 906 if (ip_rsvp_force_done) 907 ip_rsvp_force_done(so); 908 if (so == V_ip_rsvpd) 909 ip_rsvp_done(); 910 in_pcbdetach(inp); 911 in_pcbfree(inp); 912 INP_INFO_WUNLOCK(&V_ripcbinfo); 913 } 914 915 static void 916 rip_dodisconnect(struct socket *so, struct inpcb *inp) 917 { 918 struct inpcbinfo *pcbinfo; 919 920 pcbinfo = inp->inp_pcbinfo; 921 INP_INFO_WLOCK(pcbinfo); 922 INP_WLOCK(inp); 923 rip_delhash(inp); 924 inp->inp_faddr.s_addr = INADDR_ANY; 925 rip_inshash(inp); 926 SOCK_LOCK(so); 927 so->so_state &= ~SS_ISCONNECTED; 928 SOCK_UNLOCK(so); 929 INP_WUNLOCK(inp); 930 INP_INFO_WUNLOCK(pcbinfo); 931 } 932 933 static void 934 rip_abort(struct socket *so) 935 { 936 struct inpcb *inp; 937 938 inp = sotoinpcb(so); 939 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 940 941 rip_dodisconnect(so, inp); 942 } 943 944 static void 945 rip_close(struct socket *so) 946 { 947 struct inpcb *inp; 948 949 inp = sotoinpcb(so); 950 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 951 952 rip_dodisconnect(so, inp); 953 } 954 955 static int 956 rip_disconnect(struct socket *so) 957 { 958 struct inpcb *inp; 959 960 if ((so->so_state & SS_ISCONNECTED) == 0) 961 return (ENOTCONN); 962 963 inp = sotoinpcb(so); 964 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 965 966 rip_dodisconnect(so, inp); 967 return (0); 968 } 969 970 static int 971 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 972 { 973 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 974 struct inpcb *inp; 975 int error; 976 977 if (nam->sa_len != sizeof(*addr)) 978 return (EINVAL); 979 980 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 981 if (error != 0) 982 return (error); 983 984 inp = sotoinpcb(so); 985 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 986 987 if (CK_STAILQ_EMPTY(&V_ifnet) || 988 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 989 (addr->sin_addr.s_addr && 990 (inp->inp_flags & INP_BINDANY) == 0 && 991 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 992 return (EADDRNOTAVAIL); 993 994 INP_INFO_WLOCK(&V_ripcbinfo); 995 INP_WLOCK(inp); 996 rip_delhash(inp); 997 inp->inp_laddr = addr->sin_addr; 998 rip_inshash(inp); 999 INP_WUNLOCK(inp); 1000 INP_INFO_WUNLOCK(&V_ripcbinfo); 1001 return (0); 1002 } 1003 1004 static int 1005 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1006 { 1007 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 1008 struct inpcb *inp; 1009 1010 if (nam->sa_len != sizeof(*addr)) 1011 return (EINVAL); 1012 if (CK_STAILQ_EMPTY(&V_ifnet)) 1013 return (EADDRNOTAVAIL); 1014 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 1015 return (EAFNOSUPPORT); 1016 1017 inp = sotoinpcb(so); 1018 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 1019 1020 INP_INFO_WLOCK(&V_ripcbinfo); 1021 INP_WLOCK(inp); 1022 rip_delhash(inp); 1023 inp->inp_faddr = addr->sin_addr; 1024 rip_inshash(inp); 1025 soisconnected(so); 1026 INP_WUNLOCK(inp); 1027 INP_INFO_WUNLOCK(&V_ripcbinfo); 1028 return (0); 1029 } 1030 1031 static int 1032 rip_shutdown(struct socket *so) 1033 { 1034 struct inpcb *inp; 1035 1036 inp = sotoinpcb(so); 1037 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 1038 1039 INP_WLOCK(inp); 1040 socantsendmore(so); 1041 INP_WUNLOCK(inp); 1042 return (0); 1043 } 1044 1045 static int 1046 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 1047 struct mbuf *control, struct thread *td) 1048 { 1049 struct inpcb *inp; 1050 u_long dst; 1051 1052 inp = sotoinpcb(so); 1053 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 1054 1055 /* 1056 * Note: 'dst' reads below are unlocked. 1057 */ 1058 if (so->so_state & SS_ISCONNECTED) { 1059 if (nam) { 1060 m_freem(m); 1061 return (EISCONN); 1062 } 1063 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 1064 } else { 1065 if (nam == NULL) { 1066 m_freem(m); 1067 return (ENOTCONN); 1068 } 1069 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1070 } 1071 return (rip_output(m, so, dst)); 1072 } 1073 #endif /* INET */ 1074 1075 static int 1076 rip_pcblist(SYSCTL_HANDLER_ARGS) 1077 { 1078 int error, i, n; 1079 struct inpcb *inp, **inp_list; 1080 inp_gen_t gencnt; 1081 struct xinpgen xig; 1082 struct epoch_tracker et; 1083 1084 /* 1085 * The process of preparing the TCB list is too time-consuming and 1086 * resource-intensive to repeat twice on every request. 1087 */ 1088 if (req->oldptr == 0) { 1089 n = V_ripcbinfo.ipi_count; 1090 n += imax(n / 8, 10); 1091 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1092 return (0); 1093 } 1094 1095 if (req->newptr != 0) 1096 return (EPERM); 1097 1098 /* 1099 * OK, now we're committed to doing something. 1100 */ 1101 INP_INFO_WLOCK(&V_ripcbinfo); 1102 gencnt = V_ripcbinfo.ipi_gencnt; 1103 n = V_ripcbinfo.ipi_count; 1104 INP_INFO_WUNLOCK(&V_ripcbinfo); 1105 1106 bzero(&xig, sizeof(xig)); 1107 xig.xig_len = sizeof xig; 1108 xig.xig_count = n; 1109 xig.xig_gen = gencnt; 1110 xig.xig_sogen = so_gencnt; 1111 error = SYSCTL_OUT(req, &xig, sizeof xig); 1112 if (error) 1113 return (error); 1114 1115 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 1116 1117 INP_INFO_RLOCK_ET(&V_ripcbinfo, et); 1118 for (inp = CK_LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 1119 inp = CK_LIST_NEXT(inp, inp_list)) { 1120 INP_WLOCK(inp); 1121 if (inp->inp_gencnt <= gencnt && 1122 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1123 in_pcbref(inp); 1124 inp_list[i++] = inp; 1125 } 1126 INP_WUNLOCK(inp); 1127 } 1128 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et); 1129 n = i; 1130 1131 error = 0; 1132 for (i = 0; i < n; i++) { 1133 inp = inp_list[i]; 1134 INP_RLOCK(inp); 1135 if (inp->inp_gencnt <= gencnt) { 1136 struct xinpcb xi; 1137 1138 in_pcbtoxinpcb(inp, &xi); 1139 INP_RUNLOCK(inp); 1140 error = SYSCTL_OUT(req, &xi, sizeof xi); 1141 } else 1142 INP_RUNLOCK(inp); 1143 } 1144 INP_INFO_WLOCK(&V_ripcbinfo); 1145 for (i = 0; i < n; i++) { 1146 inp = inp_list[i]; 1147 INP_RLOCK(inp); 1148 if (!in_pcbrele_rlocked(inp)) 1149 INP_RUNLOCK(inp); 1150 } 1151 INP_INFO_WUNLOCK(&V_ripcbinfo); 1152 1153 if (!error) { 1154 struct epoch_tracker et; 1155 /* 1156 * Give the user an updated idea of our state. If the 1157 * generation differs from what we told her before, she knows 1158 * that something happened while we were processing this 1159 * request, and it might be necessary to retry. 1160 */ 1161 INP_INFO_RLOCK_ET(&V_ripcbinfo, et); 1162 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1163 xig.xig_sogen = so_gencnt; 1164 xig.xig_count = V_ripcbinfo.ipi_count; 1165 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et); 1166 error = SYSCTL_OUT(req, &xig, sizeof xig); 1167 } 1168 free(inp_list, M_TEMP); 1169 return (error); 1170 } 1171 1172 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1173 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 1174 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 1175 1176 #ifdef INET 1177 struct pr_usrreqs rip_usrreqs = { 1178 .pru_abort = rip_abort, 1179 .pru_attach = rip_attach, 1180 .pru_bind = rip_bind, 1181 .pru_connect = rip_connect, 1182 .pru_control = in_control, 1183 .pru_detach = rip_detach, 1184 .pru_disconnect = rip_disconnect, 1185 .pru_peeraddr = in_getpeeraddr, 1186 .pru_send = rip_send, 1187 .pru_shutdown = rip_shutdown, 1188 .pru_sockaddr = in_getsockaddr, 1189 .pru_sosetlabel = in_pcbsosetlabel, 1190 .pru_close = rip_close, 1191 }; 1192 #endif /* INET */
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