Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/raw_ip.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_inet.h" 37 #include "opt_inet6.h" 38 #include "opt_ipsec.h" 39 40 #include <sys/param.h> 41 #include <sys/jail.h> 42 #include <sys/kernel.h> 43 #include <sys/eventhandler.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/rmlock.h> 51 #include <sys/rwlock.h> 52 #include <sys/signalvar.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/systm.h> 58 59 #include <vm/uma.h> 60 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/route.h> 64 #include <net/vnet.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/in_pcb.h> 69 #include <netinet/in_var.h> 70 #include <netinet/if_ether.h> 71 #include <netinet/ip.h> 72 #include <netinet/ip_var.h> 73 #include <netinet/ip_mroute.h> 74 #include <netinet/ip_icmp.h> 75 76 #include <netipsec/ipsec_support.h> 77 78 #include <machine/stdarg.h> 79 #include <security/mac/mac_framework.h> 80 81 VNET_DEFINE(int, ip_defttl) = IPDEFTTL; 82 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW, 83 &VNET_NAME(ip_defttl), 0, 84 "Maximum TTL on IP packets"); 85 86 VNET_DEFINE(struct inpcbhead, ripcb); 87 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 88 89 #define V_ripcb VNET(ripcb) 90 #define V_ripcbinfo VNET(ripcbinfo) 91 92 /* 93 * Control and data hooks for ipfw, dummynet, divert and so on. 94 * The data hooks are not used here but it is convenient 95 * to keep them all in one place. 96 */ 97 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 98 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 99 100 int (*ip_dn_ctl_ptr)(struct sockopt *); 101 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 102 void (*ip_divert_ptr)(struct mbuf *, int); 103 int (*ng_ipfw_input_p)(struct mbuf **, int, 104 struct ip_fw_args *, int); 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_INFO_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 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 172 } 173 174 static void 175 rip_delhash(struct inpcb *inp) 176 { 177 178 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 179 INP_WLOCK_ASSERT(inp); 180 181 LIST_REMOVE(inp, inp_hash); 182 } 183 #endif /* INET */ 184 185 /* 186 * Raw interface to IP protocol. 187 */ 188 189 /* 190 * Initialize raw connection block q. 191 */ 192 static void 193 rip_zone_change(void *tag) 194 { 195 196 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 197 } 198 199 static int 200 rip_inpcb_init(void *mem, int size, int flags) 201 { 202 struct inpcb *inp = mem; 203 204 INP_LOCK_INIT(inp, "inp", "rawinp"); 205 return (0); 206 } 207 208 void 209 rip_init(void) 210 { 211 212 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, 213 1, "ripcb", rip_inpcb_init, NULL, 0, IPI_HASHFIELDS_NONE); 214 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 215 EVENTHANDLER_PRI_ANY); 216 } 217 218 #ifdef VIMAGE 219 static void 220 rip_destroy(void *unused __unused) 221 { 222 223 in_pcbinfo_destroy(&V_ripcbinfo); 224 } 225 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL); 226 #endif 227 228 #ifdef INET 229 static int 230 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 231 struct sockaddr_in *ripsrc) 232 { 233 int policyfail = 0; 234 235 INP_LOCK_ASSERT(last); 236 237 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 238 /* check AH/ESP integrity. */ 239 if (IPSEC_ENABLED(ipv4)) { 240 if (IPSEC_CHECK_POLICY(ipv4, n, last) != 0) 241 policyfail = 1; 242 } 243 #endif /* IPSEC */ 244 #ifdef MAC 245 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 246 policyfail = 1; 247 #endif 248 /* Check the minimum TTL for socket. */ 249 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 250 policyfail = 1; 251 if (!policyfail) { 252 struct mbuf *opts = NULL; 253 struct socket *so; 254 255 so = last->inp_socket; 256 if ((last->inp_flags & INP_CONTROLOPTS) || 257 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 258 ip_savecontrol(last, &opts, ip, n); 259 SOCKBUF_LOCK(&so->so_rcv); 260 if (sbappendaddr_locked(&so->so_rcv, 261 (struct sockaddr *)ripsrc, n, opts) == 0) { 262 /* should notify about lost packet */ 263 m_freem(n); 264 if (opts) 265 m_freem(opts); 266 SOCKBUF_UNLOCK(&so->so_rcv); 267 } else 268 sorwakeup_locked(so); 269 } else 270 m_freem(n); 271 return (policyfail); 272 } 273 274 /* 275 * Setup generic address and protocol structures for raw_input routine, then 276 * pass them along with mbuf chain. 277 */ 278 int 279 rip_input(struct mbuf **mp, int *offp, int proto) 280 { 281 struct ifnet *ifp; 282 struct mbuf *m = *mp; 283 struct ip *ip = mtod(m, struct ip *); 284 struct inpcb *inp, *last; 285 struct sockaddr_in ripsrc; 286 int hash; 287 288 *mp = NULL; 289 290 bzero(&ripsrc, sizeof(ripsrc)); 291 ripsrc.sin_len = sizeof(ripsrc); 292 ripsrc.sin_family = AF_INET; 293 ripsrc.sin_addr = ip->ip_src; 294 last = NULL; 295 296 ifp = m->m_pkthdr.rcvif; 297 298 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 299 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 300 INP_INFO_RLOCK(&V_ripcbinfo); 301 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 302 if (inp->inp_ip_p != proto) 303 continue; 304 #ifdef INET6 305 /* XXX inp locking */ 306 if ((inp->inp_vflag & INP_IPV4) == 0) 307 continue; 308 #endif 309 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 310 continue; 311 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 312 continue; 313 if (jailed_without_vnet(inp->inp_cred)) { 314 /* 315 * XXX: If faddr was bound to multicast group, 316 * jailed raw socket will drop datagram. 317 */ 318 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 319 continue; 320 } 321 if (last != NULL) { 322 struct mbuf *n; 323 324 n = m_copy(m, 0, (int)M_COPYALL); 325 if (n != NULL) 326 (void) rip_append(last, ip, n, &ripsrc); 327 /* XXX count dropped packet */ 328 INP_RUNLOCK(last); 329 } 330 INP_RLOCK(inp); 331 last = inp; 332 } 333 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 334 if (inp->inp_ip_p && inp->inp_ip_p != proto) 335 continue; 336 #ifdef INET6 337 /* XXX inp locking */ 338 if ((inp->inp_vflag & INP_IPV4) == 0) 339 continue; 340 #endif 341 if (!in_nullhost(inp->inp_laddr) && 342 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 343 continue; 344 if (!in_nullhost(inp->inp_faddr) && 345 !in_hosteq(inp->inp_faddr, ip->ip_src)) 346 continue; 347 if (jailed_without_vnet(inp->inp_cred)) { 348 /* 349 * Allow raw socket in jail to receive multicast; 350 * assume process had PRIV_NETINET_RAW at attach, 351 * and fall through into normal filter path if so. 352 */ 353 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 354 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 355 continue; 356 } 357 /* 358 * If this raw socket has multicast state, and we 359 * have received a multicast, check if this socket 360 * should receive it, as multicast filtering is now 361 * the responsibility of the transport layer. 362 */ 363 if (inp->inp_moptions != NULL && 364 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 365 /* 366 * If the incoming datagram is for IGMP, allow it 367 * through unconditionally to the raw socket. 368 * 369 * In the case of IGMPv2, we may not have explicitly 370 * joined the group, and may have set IFF_ALLMULTI 371 * on the interface. imo_multi_filter() may discard 372 * control traffic we actually need to see. 373 * 374 * Userland multicast routing daemons should continue 375 * filter the control traffic appropriately. 376 */ 377 int blocked; 378 379 blocked = MCAST_PASS; 380 if (proto != IPPROTO_IGMP) { 381 struct sockaddr_in group; 382 383 bzero(&group, sizeof(struct sockaddr_in)); 384 group.sin_len = sizeof(struct sockaddr_in); 385 group.sin_family = AF_INET; 386 group.sin_addr = ip->ip_dst; 387 388 blocked = imo_multi_filter(inp->inp_moptions, 389 ifp, 390 (struct sockaddr *)&group, 391 (struct sockaddr *)&ripsrc); 392 } 393 394 if (blocked != MCAST_PASS) { 395 IPSTAT_INC(ips_notmember); 396 continue; 397 } 398 } 399 if (last != NULL) { 400 struct mbuf *n; 401 402 n = m_copy(m, 0, (int)M_COPYALL); 403 if (n != NULL) 404 (void) rip_append(last, ip, n, &ripsrc); 405 /* XXX count dropped packet */ 406 INP_RUNLOCK(last); 407 } 408 INP_RLOCK(inp); 409 last = inp; 410 } 411 INP_INFO_RUNLOCK(&V_ripcbinfo); 412 if (last != NULL) { 413 if (rip_append(last, ip, m, &ripsrc) != 0) 414 IPSTAT_INC(ips_delivered); 415 INP_RUNLOCK(last); 416 } else { 417 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) { 418 IPSTAT_INC(ips_noproto); 419 IPSTAT_DEC(ips_delivered); 420 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0); 421 } else { 422 m_freem(m); 423 } 424 } 425 return (IPPROTO_DONE); 426 } 427 428 /* 429 * Generate IP header and pass packet to ip_output. Tack on options user may 430 * have setup with control call. 431 */ 432 int 433 rip_output(struct mbuf *m, struct socket *so, ...) 434 { 435 struct ip *ip; 436 int error; 437 struct inpcb *inp = sotoinpcb(so); 438 va_list ap; 439 u_long dst; 440 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 441 IP_ALLOWBROADCAST; 442 int cnt, hlen; 443 u_char opttype, optlen, *cp; 444 445 va_start(ap, so); 446 dst = va_arg(ap, u_long); 447 va_end(ap); 448 449 /* 450 * If the user handed us a complete IP packet, use it. Otherwise, 451 * allocate an mbuf for a header and fill it in. 452 */ 453 if ((inp->inp_flags & INP_HDRINCL) == 0) { 454 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 455 m_freem(m); 456 return(EMSGSIZE); 457 } 458 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 459 if (m == NULL) 460 return(ENOBUFS); 461 462 INP_RLOCK(inp); 463 ip = mtod(m, struct ip *); 464 ip->ip_tos = inp->inp_ip_tos; 465 if (inp->inp_flags & INP_DONTFRAG) 466 ip->ip_off = htons(IP_DF); 467 else 468 ip->ip_off = htons(0); 469 ip->ip_p = inp->inp_ip_p; 470 ip->ip_len = htons(m->m_pkthdr.len); 471 ip->ip_src = inp->inp_laddr; 472 ip->ip_dst.s_addr = dst; 473 if (jailed(inp->inp_cred)) { 474 /* 475 * prison_local_ip4() would be good enough but would 476 * let a source of INADDR_ANY pass, which we do not 477 * want to see from jails. 478 */ 479 if (ip->ip_src.s_addr == INADDR_ANY) { 480 error = in_pcbladdr(inp, &ip->ip_dst, &ip->ip_src, 481 inp->inp_cred); 482 } else { 483 error = prison_local_ip4(inp->inp_cred, 484 &ip->ip_src); 485 } 486 if (error != 0) { 487 INP_RUNLOCK(inp); 488 m_freem(m); 489 return (error); 490 } 491 } 492 ip->ip_ttl = inp->inp_ip_ttl; 493 } else { 494 if (m->m_pkthdr.len > IP_MAXPACKET) { 495 m_freem(m); 496 return(EMSGSIZE); 497 } 498 ip = mtod(m, struct ip *); 499 hlen = ip->ip_hl << 2; 500 if (m->m_len < hlen) { 501 m = m_pullup(m, hlen); 502 if (m == NULL) 503 return (EINVAL); 504 ip = mtod(m, struct ip *); 505 } 506 507 INP_RLOCK(inp); 508 /* 509 * Don't allow both user specified and setsockopt options, 510 * and don't allow packet length sizes that will crash. 511 */ 512 if ((hlen < sizeof (*ip)) 513 || ((hlen > sizeof (*ip)) && inp->inp_options) 514 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) { 515 INP_RUNLOCK(inp); 516 m_freem(m); 517 return (EINVAL); 518 } 519 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 520 if (error != 0) { 521 INP_RUNLOCK(inp); 522 m_freem(m); 523 return (error); 524 } 525 /* 526 * Don't allow IP options which do not have the required 527 * structure as specified in section 3.1 of RFC 791 on 528 * pages 15-23. 529 */ 530 cp = (u_char *)(ip + 1); 531 cnt = hlen - sizeof (struct ip); 532 for (; cnt > 0; cnt -= optlen, cp += optlen) { 533 opttype = cp[IPOPT_OPTVAL]; 534 if (opttype == IPOPT_EOL) 535 break; 536 if (opttype == IPOPT_NOP) { 537 optlen = 1; 538 continue; 539 } 540 if (cnt < IPOPT_OLEN + sizeof(u_char)) { 541 INP_RUNLOCK(inp); 542 m_freem(m); 543 return (EINVAL); 544 } 545 optlen = cp[IPOPT_OLEN]; 546 if (optlen < IPOPT_OLEN + sizeof(u_char) || 547 optlen > cnt) { 548 INP_RUNLOCK(inp); 549 m_freem(m); 550 return (EINVAL); 551 } 552 } 553 /* 554 * This doesn't allow application to specify ID of zero, 555 * but we got this limitation from the beginning of history. 556 */ 557 if (ip->ip_id == 0) 558 ip_fillid(ip); 559 560 /* 561 * XXX prevent ip_output from overwriting header fields. 562 */ 563 flags |= IP_RAWOUTPUT; 564 IPSTAT_INC(ips_rawout); 565 } 566 567 if (inp->inp_flags & INP_ONESBCAST) 568 flags |= IP_SENDONES; 569 570 #ifdef MAC 571 mac_inpcb_create_mbuf(inp, m); 572 #endif 573 574 error = ip_output(m, inp->inp_options, NULL, flags, 575 inp->inp_moptions, inp); 576 INP_RUNLOCK(inp); 577 return (error); 578 } 579 580 /* 581 * Raw IP socket option processing. 582 * 583 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 584 * only be created by a privileged process, and as such, socket option 585 * operations to manage system properties on any raw socket were allowed to 586 * take place without explicit additional access control checks. However, 587 * raw sockets can now also be created in jail(), and therefore explicit 588 * checks are now required. Likewise, raw sockets can be used by a process 589 * after it gives up privilege, so some caution is required. For options 590 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 591 * performed in ip_ctloutput() and therefore no check occurs here. 592 * Unilaterally checking priv_check() here breaks normal IP socket option 593 * operations on raw sockets. 594 * 595 * When adding new socket options here, make sure to add access control 596 * checks here as necessary. 597 * 598 * XXX-BZ inp locking? 599 */ 600 int 601 rip_ctloutput(struct socket *so, struct sockopt *sopt) 602 { 603 struct inpcb *inp = sotoinpcb(so); 604 int error, optval; 605 606 if (sopt->sopt_level != IPPROTO_IP) { 607 if ((sopt->sopt_level == SOL_SOCKET) && 608 (sopt->sopt_name == SO_SETFIB)) { 609 inp->inp_inc.inc_fibnum = so->so_fibnum; 610 return (0); 611 } 612 return (EINVAL); 613 } 614 615 error = 0; 616 switch (sopt->sopt_dir) { 617 case SOPT_GET: 618 switch (sopt->sopt_name) { 619 case IP_HDRINCL: 620 optval = inp->inp_flags & INP_HDRINCL; 621 error = sooptcopyout(sopt, &optval, sizeof optval); 622 break; 623 624 case IP_FW3: /* generic ipfw v.3 functions */ 625 case IP_FW_ADD: /* ADD actually returns the body... */ 626 case IP_FW_GET: 627 case IP_FW_TABLE_GETSIZE: 628 case IP_FW_TABLE_LIST: 629 case IP_FW_NAT_GET_CONFIG: 630 case IP_FW_NAT_GET_LOG: 631 if (V_ip_fw_ctl_ptr != NULL) 632 error = V_ip_fw_ctl_ptr(sopt); 633 else 634 error = ENOPROTOOPT; 635 break; 636 637 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 638 case IP_DUMMYNET_GET: 639 if (ip_dn_ctl_ptr != NULL) 640 error = ip_dn_ctl_ptr(sopt); 641 else 642 error = ENOPROTOOPT; 643 break ; 644 645 case MRT_INIT: 646 case MRT_DONE: 647 case MRT_ADD_VIF: 648 case MRT_DEL_VIF: 649 case MRT_ADD_MFC: 650 case MRT_DEL_MFC: 651 case MRT_VERSION: 652 case MRT_ASSERT: 653 case MRT_API_SUPPORT: 654 case MRT_API_CONFIG: 655 case MRT_ADD_BW_UPCALL: 656 case MRT_DEL_BW_UPCALL: 657 error = priv_check(curthread, PRIV_NETINET_MROUTE); 658 if (error != 0) 659 return (error); 660 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 661 EOPNOTSUPP; 662 break; 663 664 default: 665 error = ip_ctloutput(so, sopt); 666 break; 667 } 668 break; 669 670 case SOPT_SET: 671 switch (sopt->sopt_name) { 672 case IP_HDRINCL: 673 error = sooptcopyin(sopt, &optval, sizeof optval, 674 sizeof optval); 675 if (error) 676 break; 677 if (optval) 678 inp->inp_flags |= INP_HDRINCL; 679 else 680 inp->inp_flags &= ~INP_HDRINCL; 681 break; 682 683 case IP_FW3: /* generic ipfw v.3 functions */ 684 case IP_FW_ADD: 685 case IP_FW_DEL: 686 case IP_FW_FLUSH: 687 case IP_FW_ZERO: 688 case IP_FW_RESETLOG: 689 case IP_FW_TABLE_ADD: 690 case IP_FW_TABLE_DEL: 691 case IP_FW_TABLE_FLUSH: 692 case IP_FW_NAT_CFG: 693 case IP_FW_NAT_DEL: 694 if (V_ip_fw_ctl_ptr != NULL) 695 error = V_ip_fw_ctl_ptr(sopt); 696 else 697 error = ENOPROTOOPT; 698 break; 699 700 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 701 case IP_DUMMYNET_CONFIGURE: 702 case IP_DUMMYNET_DEL: 703 case IP_DUMMYNET_FLUSH: 704 if (ip_dn_ctl_ptr != NULL) 705 error = ip_dn_ctl_ptr(sopt); 706 else 707 error = ENOPROTOOPT ; 708 break ; 709 710 case IP_RSVP_ON: 711 error = priv_check(curthread, PRIV_NETINET_MROUTE); 712 if (error != 0) 713 return (error); 714 error = ip_rsvp_init(so); 715 break; 716 717 case IP_RSVP_OFF: 718 error = priv_check(curthread, PRIV_NETINET_MROUTE); 719 if (error != 0) 720 return (error); 721 error = ip_rsvp_done(); 722 break; 723 724 case IP_RSVP_VIF_ON: 725 case IP_RSVP_VIF_OFF: 726 error = priv_check(curthread, PRIV_NETINET_MROUTE); 727 if (error != 0) 728 return (error); 729 error = ip_rsvp_vif ? 730 ip_rsvp_vif(so, sopt) : EINVAL; 731 break; 732 733 case MRT_INIT: 734 case MRT_DONE: 735 case MRT_ADD_VIF: 736 case MRT_DEL_VIF: 737 case MRT_ADD_MFC: 738 case MRT_DEL_MFC: 739 case MRT_VERSION: 740 case MRT_ASSERT: 741 case MRT_API_SUPPORT: 742 case MRT_API_CONFIG: 743 case MRT_ADD_BW_UPCALL: 744 case MRT_DEL_BW_UPCALL: 745 error = priv_check(curthread, PRIV_NETINET_MROUTE); 746 if (error != 0) 747 return (error); 748 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 749 EOPNOTSUPP; 750 break; 751 752 default: 753 error = ip_ctloutput(so, sopt); 754 break; 755 } 756 break; 757 } 758 759 return (error); 760 } 761 762 /* 763 * This function exists solely to receive the PRC_IFDOWN messages which are 764 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 765 * in_ifadown() to remove all routes corresponding to that address. It also 766 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 767 * routes. 768 */ 769 void 770 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 771 { 772 struct rm_priotracker in_ifa_tracker; 773 struct in_ifaddr *ia; 774 struct ifnet *ifp; 775 int err; 776 int flags; 777 778 switch (cmd) { 779 case PRC_IFDOWN: 780 IN_IFADDR_RLOCK(&in_ifa_tracker); 781 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 782 if (ia->ia_ifa.ifa_addr == sa 783 && (ia->ia_flags & IFA_ROUTE)) { 784 ifa_ref(&ia->ia_ifa); 785 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 786 /* 787 * in_scrubprefix() kills the interface route. 788 */ 789 in_scrubprefix(ia, 0); 790 /* 791 * in_ifadown gets rid of all the rest of the 792 * routes. This is not quite the right thing 793 * to do, but at least if we are running a 794 * routing process they will come back. 795 */ 796 in_ifadown(&ia->ia_ifa, 0); 797 ifa_free(&ia->ia_ifa); 798 break; 799 } 800 } 801 if (ia == NULL) /* If ia matched, already unlocked. */ 802 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 803 break; 804 805 case PRC_IFUP: 806 IN_IFADDR_RLOCK(&in_ifa_tracker); 807 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 808 if (ia->ia_ifa.ifa_addr == sa) 809 break; 810 } 811 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { 812 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 813 return; 814 } 815 ifa_ref(&ia->ia_ifa); 816 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 817 flags = RTF_UP; 818 ifp = ia->ia_ifa.ifa_ifp; 819 820 if ((ifp->if_flags & IFF_LOOPBACK) 821 || (ifp->if_flags & IFF_POINTOPOINT)) 822 flags |= RTF_HOST; 823 824 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 825 826 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 827 if (err == 0) 828 ia->ia_flags |= IFA_ROUTE; 829 830 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 831 832 ifa_free(&ia->ia_ifa); 833 break; 834 } 835 } 836 837 static int 838 rip_attach(struct socket *so, int proto, struct thread *td) 839 { 840 struct inpcb *inp; 841 int error; 842 843 inp = sotoinpcb(so); 844 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 845 846 error = priv_check(td, PRIV_NETINET_RAW); 847 if (error) 848 return (error); 849 if (proto >= IPPROTO_MAX || proto < 0) 850 return EPROTONOSUPPORT; 851 error = soreserve(so, rip_sendspace, rip_recvspace); 852 if (error) 853 return (error); 854 INP_INFO_WLOCK(&V_ripcbinfo); 855 error = in_pcballoc(so, &V_ripcbinfo); 856 if (error) { 857 INP_INFO_WUNLOCK(&V_ripcbinfo); 858 return (error); 859 } 860 inp = (struct inpcb *)so->so_pcb; 861 inp->inp_vflag |= INP_IPV4; 862 inp->inp_ip_p = proto; 863 inp->inp_ip_ttl = V_ip_defttl; 864 rip_inshash(inp); 865 INP_INFO_WUNLOCK(&V_ripcbinfo); 866 INP_WUNLOCK(inp); 867 return (0); 868 } 869 870 static void 871 rip_detach(struct socket *so) 872 { 873 struct inpcb *inp; 874 875 inp = sotoinpcb(so); 876 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 877 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 878 ("rip_detach: not closed")); 879 880 INP_INFO_WLOCK(&V_ripcbinfo); 881 INP_WLOCK(inp); 882 rip_delhash(inp); 883 if (so == V_ip_mrouter && ip_mrouter_done) 884 ip_mrouter_done(); 885 if (ip_rsvp_force_done) 886 ip_rsvp_force_done(so); 887 if (so == V_ip_rsvpd) 888 ip_rsvp_done(); 889 in_pcbdetach(inp); 890 in_pcbfree(inp); 891 INP_INFO_WUNLOCK(&V_ripcbinfo); 892 } 893 894 static void 895 rip_dodisconnect(struct socket *so, struct inpcb *inp) 896 { 897 struct inpcbinfo *pcbinfo; 898 899 pcbinfo = inp->inp_pcbinfo; 900 INP_INFO_WLOCK(pcbinfo); 901 INP_WLOCK(inp); 902 rip_delhash(inp); 903 inp->inp_faddr.s_addr = INADDR_ANY; 904 rip_inshash(inp); 905 SOCK_LOCK(so); 906 so->so_state &= ~SS_ISCONNECTED; 907 SOCK_UNLOCK(so); 908 INP_WUNLOCK(inp); 909 INP_INFO_WUNLOCK(pcbinfo); 910 } 911 912 static void 913 rip_abort(struct socket *so) 914 { 915 struct inpcb *inp; 916 917 inp = sotoinpcb(so); 918 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 919 920 rip_dodisconnect(so, inp); 921 } 922 923 static void 924 rip_close(struct socket *so) 925 { 926 struct inpcb *inp; 927 928 inp = sotoinpcb(so); 929 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 930 931 rip_dodisconnect(so, inp); 932 } 933 934 static int 935 rip_disconnect(struct socket *so) 936 { 937 struct inpcb *inp; 938 939 if ((so->so_state & SS_ISCONNECTED) == 0) 940 return (ENOTCONN); 941 942 inp = sotoinpcb(so); 943 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 944 945 rip_dodisconnect(so, inp); 946 return (0); 947 } 948 949 static int 950 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 951 { 952 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 953 struct inpcb *inp; 954 int error; 955 956 if (nam->sa_len != sizeof(*addr)) 957 return (EINVAL); 958 959 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 960 if (error != 0) 961 return (error); 962 963 inp = sotoinpcb(so); 964 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 965 966 if (TAILQ_EMPTY(&V_ifnet) || 967 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 968 (addr->sin_addr.s_addr && 969 (inp->inp_flags & INP_BINDANY) == 0 && 970 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 971 return (EADDRNOTAVAIL); 972 973 INP_INFO_WLOCK(&V_ripcbinfo); 974 INP_WLOCK(inp); 975 rip_delhash(inp); 976 inp->inp_laddr = addr->sin_addr; 977 rip_inshash(inp); 978 INP_WUNLOCK(inp); 979 INP_INFO_WUNLOCK(&V_ripcbinfo); 980 return (0); 981 } 982 983 static int 984 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 985 { 986 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 987 struct inpcb *inp; 988 989 if (nam->sa_len != sizeof(*addr)) 990 return (EINVAL); 991 if (TAILQ_EMPTY(&V_ifnet)) 992 return (EADDRNOTAVAIL); 993 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 994 return (EAFNOSUPPORT); 995 996 inp = sotoinpcb(so); 997 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 998 999 INP_INFO_WLOCK(&V_ripcbinfo); 1000 INP_WLOCK(inp); 1001 rip_delhash(inp); 1002 inp->inp_faddr = addr->sin_addr; 1003 rip_inshash(inp); 1004 soisconnected(so); 1005 INP_WUNLOCK(inp); 1006 INP_INFO_WUNLOCK(&V_ripcbinfo); 1007 return (0); 1008 } 1009 1010 static int 1011 rip_shutdown(struct socket *so) 1012 { 1013 struct inpcb *inp; 1014 1015 inp = sotoinpcb(so); 1016 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 1017 1018 INP_WLOCK(inp); 1019 socantsendmore(so); 1020 INP_WUNLOCK(inp); 1021 return (0); 1022 } 1023 1024 static int 1025 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 1026 struct mbuf *control, struct thread *td) 1027 { 1028 struct inpcb *inp; 1029 u_long dst; 1030 1031 inp = sotoinpcb(so); 1032 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 1033 1034 /* 1035 * Note: 'dst' reads below are unlocked. 1036 */ 1037 if (so->so_state & SS_ISCONNECTED) { 1038 if (nam) { 1039 m_freem(m); 1040 return (EISCONN); 1041 } 1042 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 1043 } else { 1044 if (nam == NULL) { 1045 m_freem(m); 1046 return (ENOTCONN); 1047 } 1048 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1049 } 1050 return (rip_output(m, so, dst)); 1051 } 1052 #endif /* INET */ 1053 1054 static int 1055 rip_pcblist(SYSCTL_HANDLER_ARGS) 1056 { 1057 int error, i, n; 1058 struct inpcb *inp, **inp_list; 1059 inp_gen_t gencnt; 1060 struct xinpgen xig; 1061 1062 /* 1063 * The process of preparing the TCB list is too time-consuming and 1064 * resource-intensive to repeat twice on every request. 1065 */ 1066 if (req->oldptr == 0) { 1067 n = V_ripcbinfo.ipi_count; 1068 n += imax(n / 8, 10); 1069 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1070 return (0); 1071 } 1072 1073 if (req->newptr != 0) 1074 return (EPERM); 1075 1076 /* 1077 * OK, now we're committed to doing something. 1078 */ 1079 INP_INFO_RLOCK(&V_ripcbinfo); 1080 gencnt = V_ripcbinfo.ipi_gencnt; 1081 n = V_ripcbinfo.ipi_count; 1082 INP_INFO_RUNLOCK(&V_ripcbinfo); 1083 1084 bzero(&xig, sizeof(xig)); 1085 xig.xig_len = sizeof xig; 1086 xig.xig_count = n; 1087 xig.xig_gen = gencnt; 1088 xig.xig_sogen = so_gencnt; 1089 error = SYSCTL_OUT(req, &xig, sizeof xig); 1090 if (error) 1091 return (error); 1092 1093 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 1094 1095 INP_INFO_RLOCK(&V_ripcbinfo); 1096 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 1097 inp = LIST_NEXT(inp, inp_list)) { 1098 INP_WLOCK(inp); 1099 if (inp->inp_gencnt <= gencnt && 1100 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1101 in_pcbref(inp); 1102 inp_list[i++] = inp; 1103 } 1104 INP_WUNLOCK(inp); 1105 } 1106 INP_INFO_RUNLOCK(&V_ripcbinfo); 1107 n = i; 1108 1109 error = 0; 1110 for (i = 0; i < n; i++) { 1111 inp = inp_list[i]; 1112 INP_RLOCK(inp); 1113 if (inp->inp_gencnt <= gencnt) { 1114 struct xinpcb xi; 1115 1116 bzero(&xi, sizeof(xi)); 1117 xi.xi_len = sizeof xi; 1118 /* XXX should avoid extra copy */ 1119 bcopy(inp, &xi.xi_inp, sizeof *inp); 1120 if (inp->inp_socket) 1121 sotoxsocket(inp->inp_socket, &xi.xi_socket); 1122 INP_RUNLOCK(inp); 1123 error = SYSCTL_OUT(req, &xi, sizeof xi); 1124 } else 1125 INP_RUNLOCK(inp); 1126 } 1127 INP_INFO_WLOCK(&V_ripcbinfo); 1128 for (i = 0; i < n; i++) { 1129 inp = inp_list[i]; 1130 INP_RLOCK(inp); 1131 if (!in_pcbrele_rlocked(inp)) 1132 INP_RUNLOCK(inp); 1133 } 1134 INP_INFO_WUNLOCK(&V_ripcbinfo); 1135 1136 if (!error) { 1137 /* 1138 * Give the user an updated idea of our state. If the 1139 * generation differs from what we told her before, she knows 1140 * that something happened while we were processing this 1141 * request, and it might be necessary to retry. 1142 */ 1143 INP_INFO_RLOCK(&V_ripcbinfo); 1144 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1145 xig.xig_sogen = so_gencnt; 1146 xig.xig_count = V_ripcbinfo.ipi_count; 1147 INP_INFO_RUNLOCK(&V_ripcbinfo); 1148 error = SYSCTL_OUT(req, &xig, sizeof xig); 1149 } 1150 free(inp_list, M_TEMP); 1151 return (error); 1152 } 1153 1154 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1155 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 1156 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 1157 1158 #ifdef INET 1159 struct pr_usrreqs rip_usrreqs = { 1160 .pru_abort = rip_abort, 1161 .pru_attach = rip_attach, 1162 .pru_bind = rip_bind, 1163 .pru_connect = rip_connect, 1164 .pru_control = in_control, 1165 .pru_detach = rip_detach, 1166 .pru_disconnect = rip_disconnect, 1167 .pru_peeraddr = in_getpeeraddr, 1168 .pru_send = rip_send, 1169 .pru_shutdown = rip_shutdown, 1170 .pru_sockaddr = in_getsockaddr, 1171 .pru_sosetlabel = in_pcbsosetlabel, 1172 .pru_close = rip_close, 1173 }; 1174 #endif /* INET */
Cache object: 391b1db85d9cf09f5cabf35cd894505d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]