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/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/protosw.h> 49 #include <sys/rwlock.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sx.h> 54 #include <sys/sysctl.h> 55 #include <sys/systm.h> 56 57 #include <vm/uma.h> 58 59 #include <net/if.h> 60 #include <net/if_var.h> 61 #include <net/route.h> 62 #include <net/vnet.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/in_pcb.h> 67 #include <netinet/in_var.h> 68 #include <netinet/if_ether.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/ip_mroute.h> 72 73 #ifdef IPSEC 74 #include <netipsec/ipsec.h> 75 #endif /*IPSEC*/ 76 77 #include <machine/stdarg.h> 78 #include <security/mac/mac_framework.h> 79 80 VNET_DEFINE(int, ip_defttl) = IPDEFTTL; 81 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW, 82 &VNET_NAME(ip_defttl), 0, 83 "Maximum TTL on IP packets"); 84 85 VNET_DEFINE(struct inpcbhead, ripcb); 86 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 87 88 #define V_ripcb VNET(ripcb) 89 #define V_ripcbinfo VNET(ripcbinfo) 90 91 /* 92 * Control and data hooks for ipfw, dummynet, divert and so on. 93 * The data hooks are not used here but it is convenient 94 * to keep them all in one place. 95 */ 96 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 97 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 98 99 int (*ip_dn_ctl_ptr)(struct sockopt *); 100 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 101 void (*ip_divert_ptr)(struct mbuf *, int); 102 int (*ng_ipfw_input_p)(struct mbuf **, int, 103 struct ip_fw_args *, int); 104 105 #ifdef INET 106 /* 107 * Hooks for multicast routing. They all default to NULL, so leave them not 108 * initialized and rely on BSS being set to 0. 109 */ 110 111 /* 112 * The socket used to communicate with the multicast routing daemon. 113 */ 114 VNET_DEFINE(struct socket *, ip_mrouter); 115 116 /* 117 * The various mrouter and rsvp functions. 118 */ 119 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 120 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 121 int (*ip_mrouter_done)(void); 122 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 123 struct ip_moptions *); 124 int (*mrt_ioctl)(u_long, caddr_t, int); 125 int (*legal_vif_num)(int); 126 u_long (*ip_mcast_src)(int); 127 128 int (*rsvp_input_p)(struct mbuf **, int *, int); 129 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 130 void (*ip_rsvp_force_done)(struct socket *); 131 #endif /* INET */ 132 133 u_long rip_sendspace = 9216; 134 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 135 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 136 137 u_long rip_recvspace = 9216; 138 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 139 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 140 141 /* 142 * Hash functions 143 */ 144 145 #define INP_PCBHASH_RAW_SIZE 256 146 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 147 (((proto) + (laddr) + (faddr)) % (mask) + 1) 148 149 #ifdef INET 150 static void 151 rip_inshash(struct inpcb *inp) 152 { 153 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 154 struct inpcbhead *pcbhash; 155 int hash; 156 157 INP_INFO_WLOCK_ASSERT(pcbinfo); 158 INP_WLOCK_ASSERT(inp); 159 160 if (inp->inp_ip_p != 0 && 161 inp->inp_laddr.s_addr != INADDR_ANY && 162 inp->inp_faddr.s_addr != INADDR_ANY) { 163 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 164 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 165 } else 166 hash = 0; 167 pcbhash = &pcbinfo->ipi_hashbase[hash]; 168 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 169 } 170 171 static void 172 rip_delhash(struct inpcb *inp) 173 { 174 175 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 176 INP_WLOCK_ASSERT(inp); 177 178 LIST_REMOVE(inp, inp_hash); 179 } 180 #endif /* INET */ 181 182 /* 183 * Raw interface to IP protocol. 184 */ 185 186 /* 187 * Initialize raw connection block q. 188 */ 189 static void 190 rip_zone_change(void *tag) 191 { 192 193 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 194 } 195 196 static int 197 rip_inpcb_init(void *mem, int size, int flags) 198 { 199 struct inpcb *inp = mem; 200 201 INP_LOCK_INIT(inp, "inp", "rawinp"); 202 return (0); 203 } 204 205 void 206 rip_init(void) 207 { 208 209 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, 210 1, "ripcb", rip_inpcb_init, NULL, UMA_ZONE_NOFREE, 211 IPI_HASHFIELDS_NONE); 212 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 213 EVENTHANDLER_PRI_ANY); 214 } 215 216 #ifdef VIMAGE 217 void 218 rip_destroy(void) 219 { 220 221 in_pcbinfo_destroy(&V_ripcbinfo); 222 } 223 #endif 224 225 #ifdef INET 226 static int 227 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 228 struct sockaddr_in *ripsrc) 229 { 230 int policyfail = 0; 231 232 INP_LOCK_ASSERT(last); 233 234 #ifdef IPSEC 235 /* check AH/ESP integrity. */ 236 if (ipsec4_in_reject(n, last)) { 237 policyfail = 1; 238 } 239 #endif /* IPSEC */ 240 #ifdef MAC 241 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 242 policyfail = 1; 243 #endif 244 /* Check the minimum TTL for socket. */ 245 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 246 policyfail = 1; 247 if (!policyfail) { 248 struct mbuf *opts = NULL; 249 struct socket *so; 250 251 so = last->inp_socket; 252 if ((last->inp_flags & INP_CONTROLOPTS) || 253 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 254 ip_savecontrol(last, &opts, ip, n); 255 SOCKBUF_LOCK(&so->so_rcv); 256 if (sbappendaddr_locked(&so->so_rcv, 257 (struct sockaddr *)ripsrc, n, opts) == 0) { 258 /* should notify about lost packet */ 259 m_freem(n); 260 if (opts) 261 m_freem(opts); 262 SOCKBUF_UNLOCK(&so->so_rcv); 263 } else 264 sorwakeup_locked(so); 265 } else 266 m_freem(n); 267 return (policyfail); 268 } 269 270 /* 271 * Setup generic address and protocol structures for raw_input routine, then 272 * pass them along with mbuf chain. 273 */ 274 int 275 rip_input(struct mbuf **mp, int *offp, int proto) 276 { 277 struct ifnet *ifp; 278 struct mbuf *m = *mp; 279 struct ip *ip = mtod(m, struct ip *); 280 struct inpcb *inp, *last; 281 struct sockaddr_in ripsrc; 282 int hash; 283 284 *mp = NULL; 285 286 bzero(&ripsrc, sizeof(ripsrc)); 287 ripsrc.sin_len = sizeof(ripsrc); 288 ripsrc.sin_family = AF_INET; 289 ripsrc.sin_addr = ip->ip_src; 290 last = NULL; 291 292 ifp = m->m_pkthdr.rcvif; 293 294 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 295 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 296 INP_INFO_RLOCK(&V_ripcbinfo); 297 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 298 if (inp->inp_ip_p != proto) 299 continue; 300 #ifdef INET6 301 /* XXX inp locking */ 302 if ((inp->inp_vflag & INP_IPV4) == 0) 303 continue; 304 #endif 305 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 306 continue; 307 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 308 continue; 309 if (jailed_without_vnet(inp->inp_cred)) { 310 /* 311 * XXX: If faddr was bound to multicast group, 312 * jailed raw socket will drop datagram. 313 */ 314 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 315 continue; 316 } 317 if (last != NULL) { 318 struct mbuf *n; 319 320 n = m_copy(m, 0, (int)M_COPYALL); 321 if (n != NULL) 322 (void) rip_append(last, ip, n, &ripsrc); 323 /* XXX count dropped packet */ 324 INP_RUNLOCK(last); 325 } 326 INP_RLOCK(inp); 327 last = inp; 328 } 329 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 330 if (inp->inp_ip_p && inp->inp_ip_p != proto) 331 continue; 332 #ifdef INET6 333 /* XXX inp locking */ 334 if ((inp->inp_vflag & INP_IPV4) == 0) 335 continue; 336 #endif 337 if (!in_nullhost(inp->inp_laddr) && 338 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 339 continue; 340 if (!in_nullhost(inp->inp_faddr) && 341 !in_hosteq(inp->inp_faddr, ip->ip_src)) 342 continue; 343 if (jailed_without_vnet(inp->inp_cred)) { 344 /* 345 * Allow raw socket in jail to receive multicast; 346 * assume process had PRIV_NETINET_RAW at attach, 347 * and fall through into normal filter path if so. 348 */ 349 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 350 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 351 continue; 352 } 353 /* 354 * If this raw socket has multicast state, and we 355 * have received a multicast, check if this socket 356 * should receive it, as multicast filtering is now 357 * the responsibility of the transport layer. 358 */ 359 if (inp->inp_moptions != NULL && 360 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 361 /* 362 * If the incoming datagram is for IGMP, allow it 363 * through unconditionally to the raw socket. 364 * 365 * In the case of IGMPv2, we may not have explicitly 366 * joined the group, and may have set IFF_ALLMULTI 367 * on the interface. imo_multi_filter() may discard 368 * control traffic we actually need to see. 369 * 370 * Userland multicast routing daemons should continue 371 * filter the control traffic appropriately. 372 */ 373 int blocked; 374 375 blocked = MCAST_PASS; 376 if (proto != IPPROTO_IGMP) { 377 struct sockaddr_in group; 378 379 bzero(&group, sizeof(struct sockaddr_in)); 380 group.sin_len = sizeof(struct sockaddr_in); 381 group.sin_family = AF_INET; 382 group.sin_addr = ip->ip_dst; 383 384 blocked = imo_multi_filter(inp->inp_moptions, 385 ifp, 386 (struct sockaddr *)&group, 387 (struct sockaddr *)&ripsrc); 388 } 389 390 if (blocked != MCAST_PASS) { 391 IPSTAT_INC(ips_notmember); 392 continue; 393 } 394 } 395 if (last != NULL) { 396 struct mbuf *n; 397 398 n = m_copy(m, 0, (int)M_COPYALL); 399 if (n != NULL) 400 (void) rip_append(last, ip, n, &ripsrc); 401 /* XXX count dropped packet */ 402 INP_RUNLOCK(last); 403 } 404 INP_RLOCK(inp); 405 last = inp; 406 } 407 INP_INFO_RUNLOCK(&V_ripcbinfo); 408 if (last != NULL) { 409 if (rip_append(last, ip, m, &ripsrc) != 0) 410 IPSTAT_INC(ips_delivered); 411 INP_RUNLOCK(last); 412 } else { 413 m_freem(m); 414 IPSTAT_INC(ips_noproto); 415 IPSTAT_DEC(ips_delivered); 416 } 417 return (IPPROTO_DONE); 418 } 419 420 /* 421 * Generate IP header and pass packet to ip_output. Tack on options user may 422 * have setup with control call. 423 */ 424 int 425 rip_output(struct mbuf *m, struct socket *so, ...) 426 { 427 struct ip *ip; 428 int error; 429 struct inpcb *inp = sotoinpcb(so); 430 va_list ap; 431 u_long dst; 432 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 433 IP_ALLOWBROADCAST; 434 435 va_start(ap, so); 436 dst = va_arg(ap, u_long); 437 va_end(ap); 438 439 /* 440 * If the user handed us a complete IP packet, use it. Otherwise, 441 * allocate an mbuf for a header and fill it in. 442 */ 443 if ((inp->inp_flags & INP_HDRINCL) == 0) { 444 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 445 m_freem(m); 446 return(EMSGSIZE); 447 } 448 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 449 if (m == NULL) 450 return(ENOBUFS); 451 452 INP_RLOCK(inp); 453 ip = mtod(m, struct ip *); 454 ip->ip_tos = inp->inp_ip_tos; 455 if (inp->inp_flags & INP_DONTFRAG) 456 ip->ip_off = htons(IP_DF); 457 else 458 ip->ip_off = htons(0); 459 ip->ip_p = inp->inp_ip_p; 460 ip->ip_len = htons(m->m_pkthdr.len); 461 ip->ip_src = inp->inp_laddr; 462 ip->ip_dst.s_addr = dst; 463 if (jailed(inp->inp_cred)) { 464 /* 465 * prison_local_ip4() would be good enough but would 466 * let a source of INADDR_ANY pass, which we do not 467 * want to see from jails. 468 */ 469 if (ip->ip_src.s_addr == INADDR_ANY) { 470 error = in_pcbladdr(inp, &ip->ip_dst, &ip->ip_src, 471 inp->inp_cred); 472 } else { 473 error = prison_local_ip4(inp->inp_cred, 474 &ip->ip_src); 475 } 476 if (error != 0) { 477 INP_RUNLOCK(inp); 478 m_freem(m); 479 return (error); 480 } 481 } 482 ip->ip_ttl = inp->inp_ip_ttl; 483 } else { 484 if (m->m_pkthdr.len > IP_MAXPACKET) { 485 m_freem(m); 486 return(EMSGSIZE); 487 } 488 INP_RLOCK(inp); 489 ip = mtod(m, struct ip *); 490 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 491 if (error != 0) { 492 INP_RUNLOCK(inp); 493 m_freem(m); 494 return (error); 495 } 496 497 /* 498 * Don't allow both user specified and setsockopt options, 499 * and don't allow packet length sizes that will crash. 500 */ 501 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 502 || (ntohs(ip->ip_len) > m->m_pkthdr.len) 503 || (ntohs(ip->ip_len) < (ip->ip_hl << 2))) { 504 INP_RUNLOCK(inp); 505 m_freem(m); 506 return (EINVAL); 507 } 508 /* 509 * This doesn't allow application to specify ID of zero, 510 * but we got this limitation from the beginning of history. 511 */ 512 if (ip->ip_id == 0) 513 ip_fillid(ip); 514 515 /* 516 * XXX prevent ip_output from overwriting header fields. 517 */ 518 flags |= IP_RAWOUTPUT; 519 IPSTAT_INC(ips_rawout); 520 } 521 522 if (inp->inp_flags & INP_ONESBCAST) 523 flags |= IP_SENDONES; 524 525 #ifdef MAC 526 mac_inpcb_create_mbuf(inp, m); 527 #endif 528 529 error = ip_output(m, inp->inp_options, NULL, flags, 530 inp->inp_moptions, inp); 531 INP_RUNLOCK(inp); 532 return (error); 533 } 534 535 /* 536 * Raw IP socket option processing. 537 * 538 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 539 * only be created by a privileged process, and as such, socket option 540 * operations to manage system properties on any raw socket were allowed to 541 * take place without explicit additional access control checks. However, 542 * raw sockets can now also be created in jail(), and therefore explicit 543 * checks are now required. Likewise, raw sockets can be used by a process 544 * after it gives up privilege, so some caution is required. For options 545 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 546 * performed in ip_ctloutput() and therefore no check occurs here. 547 * Unilaterally checking priv_check() here breaks normal IP socket option 548 * operations on raw sockets. 549 * 550 * When adding new socket options here, make sure to add access control 551 * checks here as necessary. 552 * 553 * XXX-BZ inp locking? 554 */ 555 int 556 rip_ctloutput(struct socket *so, struct sockopt *sopt) 557 { 558 struct inpcb *inp = sotoinpcb(so); 559 int error, optval; 560 561 if (sopt->sopt_level != IPPROTO_IP) { 562 if ((sopt->sopt_level == SOL_SOCKET) && 563 (sopt->sopt_name == SO_SETFIB)) { 564 inp->inp_inc.inc_fibnum = so->so_fibnum; 565 return (0); 566 } 567 return (EINVAL); 568 } 569 570 error = 0; 571 switch (sopt->sopt_dir) { 572 case SOPT_GET: 573 switch (sopt->sopt_name) { 574 case IP_HDRINCL: 575 optval = inp->inp_flags & INP_HDRINCL; 576 error = sooptcopyout(sopt, &optval, sizeof optval); 577 break; 578 579 case IP_FW3: /* generic ipfw v.3 functions */ 580 case IP_FW_ADD: /* ADD actually returns the body... */ 581 case IP_FW_GET: 582 case IP_FW_TABLE_GETSIZE: 583 case IP_FW_TABLE_LIST: 584 case IP_FW_NAT_GET_CONFIG: 585 case IP_FW_NAT_GET_LOG: 586 if (V_ip_fw_ctl_ptr != NULL) 587 error = V_ip_fw_ctl_ptr(sopt); 588 else 589 error = ENOPROTOOPT; 590 break; 591 592 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 593 case IP_DUMMYNET_GET: 594 if (ip_dn_ctl_ptr != NULL) 595 error = ip_dn_ctl_ptr(sopt); 596 else 597 error = ENOPROTOOPT; 598 break ; 599 600 case MRT_INIT: 601 case MRT_DONE: 602 case MRT_ADD_VIF: 603 case MRT_DEL_VIF: 604 case MRT_ADD_MFC: 605 case MRT_DEL_MFC: 606 case MRT_VERSION: 607 case MRT_ASSERT: 608 case MRT_API_SUPPORT: 609 case MRT_API_CONFIG: 610 case MRT_ADD_BW_UPCALL: 611 case MRT_DEL_BW_UPCALL: 612 error = priv_check(curthread, PRIV_NETINET_MROUTE); 613 if (error != 0) 614 return (error); 615 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 616 EOPNOTSUPP; 617 break; 618 619 default: 620 error = ip_ctloutput(so, sopt); 621 break; 622 } 623 break; 624 625 case SOPT_SET: 626 switch (sopt->sopt_name) { 627 case IP_HDRINCL: 628 error = sooptcopyin(sopt, &optval, sizeof optval, 629 sizeof optval); 630 if (error) 631 break; 632 if (optval) 633 inp->inp_flags |= INP_HDRINCL; 634 else 635 inp->inp_flags &= ~INP_HDRINCL; 636 break; 637 638 case IP_FW3: /* generic ipfw v.3 functions */ 639 case IP_FW_ADD: 640 case IP_FW_DEL: 641 case IP_FW_FLUSH: 642 case IP_FW_ZERO: 643 case IP_FW_RESETLOG: 644 case IP_FW_TABLE_ADD: 645 case IP_FW_TABLE_DEL: 646 case IP_FW_TABLE_FLUSH: 647 case IP_FW_NAT_CFG: 648 case IP_FW_NAT_DEL: 649 if (V_ip_fw_ctl_ptr != NULL) 650 error = V_ip_fw_ctl_ptr(sopt); 651 else 652 error = ENOPROTOOPT; 653 break; 654 655 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 656 case IP_DUMMYNET_CONFIGURE: 657 case IP_DUMMYNET_DEL: 658 case IP_DUMMYNET_FLUSH: 659 if (ip_dn_ctl_ptr != NULL) 660 error = ip_dn_ctl_ptr(sopt); 661 else 662 error = ENOPROTOOPT ; 663 break ; 664 665 case IP_RSVP_ON: 666 error = priv_check(curthread, PRIV_NETINET_MROUTE); 667 if (error != 0) 668 return (error); 669 error = ip_rsvp_init(so); 670 break; 671 672 case IP_RSVP_OFF: 673 error = priv_check(curthread, PRIV_NETINET_MROUTE); 674 if (error != 0) 675 return (error); 676 error = ip_rsvp_done(); 677 break; 678 679 case IP_RSVP_VIF_ON: 680 case IP_RSVP_VIF_OFF: 681 error = priv_check(curthread, PRIV_NETINET_MROUTE); 682 if (error != 0) 683 return (error); 684 error = ip_rsvp_vif ? 685 ip_rsvp_vif(so, sopt) : EINVAL; 686 break; 687 688 case MRT_INIT: 689 case MRT_DONE: 690 case MRT_ADD_VIF: 691 case MRT_DEL_VIF: 692 case MRT_ADD_MFC: 693 case MRT_DEL_MFC: 694 case MRT_VERSION: 695 case MRT_ASSERT: 696 case MRT_API_SUPPORT: 697 case MRT_API_CONFIG: 698 case MRT_ADD_BW_UPCALL: 699 case MRT_DEL_BW_UPCALL: 700 error = priv_check(curthread, PRIV_NETINET_MROUTE); 701 if (error != 0) 702 return (error); 703 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 704 EOPNOTSUPP; 705 break; 706 707 default: 708 error = ip_ctloutput(so, sopt); 709 break; 710 } 711 break; 712 } 713 714 return (error); 715 } 716 717 /* 718 * This function exists solely to receive the PRC_IFDOWN messages which are 719 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 720 * in_ifadown() to remove all routes corresponding to that address. It also 721 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 722 * routes. 723 */ 724 void 725 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 726 { 727 struct in_ifaddr *ia; 728 struct ifnet *ifp; 729 int err; 730 int flags; 731 732 switch (cmd) { 733 case PRC_IFDOWN: 734 IN_IFADDR_RLOCK(); 735 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 736 if (ia->ia_ifa.ifa_addr == sa 737 && (ia->ia_flags & IFA_ROUTE)) { 738 ifa_ref(&ia->ia_ifa); 739 IN_IFADDR_RUNLOCK(); 740 /* 741 * in_scrubprefix() kills the interface route. 742 */ 743 in_scrubprefix(ia, 0); 744 /* 745 * in_ifadown gets rid of all the rest of the 746 * routes. This is not quite the right thing 747 * to do, but at least if we are running a 748 * routing process they will come back. 749 */ 750 in_ifadown(&ia->ia_ifa, 0); 751 ifa_free(&ia->ia_ifa); 752 break; 753 } 754 } 755 if (ia == NULL) /* If ia matched, already unlocked. */ 756 IN_IFADDR_RUNLOCK(); 757 break; 758 759 case PRC_IFUP: 760 IN_IFADDR_RLOCK(); 761 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 762 if (ia->ia_ifa.ifa_addr == sa) 763 break; 764 } 765 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { 766 IN_IFADDR_RUNLOCK(); 767 return; 768 } 769 ifa_ref(&ia->ia_ifa); 770 IN_IFADDR_RUNLOCK(); 771 flags = RTF_UP; 772 ifp = ia->ia_ifa.ifa_ifp; 773 774 if ((ifp->if_flags & IFF_LOOPBACK) 775 || (ifp->if_flags & IFF_POINTOPOINT)) 776 flags |= RTF_HOST; 777 778 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 779 780 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 781 if (err == 0) 782 ia->ia_flags |= IFA_ROUTE; 783 784 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 785 786 ifa_free(&ia->ia_ifa); 787 break; 788 } 789 } 790 791 static int 792 rip_attach(struct socket *so, int proto, struct thread *td) 793 { 794 struct inpcb *inp; 795 int error; 796 797 inp = sotoinpcb(so); 798 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 799 800 error = priv_check(td, PRIV_NETINET_RAW); 801 if (error) 802 return (error); 803 if (proto >= IPPROTO_MAX || proto < 0) 804 return EPROTONOSUPPORT; 805 error = soreserve(so, rip_sendspace, rip_recvspace); 806 if (error) 807 return (error); 808 INP_INFO_WLOCK(&V_ripcbinfo); 809 error = in_pcballoc(so, &V_ripcbinfo); 810 if (error) { 811 INP_INFO_WUNLOCK(&V_ripcbinfo); 812 return (error); 813 } 814 inp = (struct inpcb *)so->so_pcb; 815 inp->inp_vflag |= INP_IPV4; 816 inp->inp_ip_p = proto; 817 inp->inp_ip_ttl = V_ip_defttl; 818 rip_inshash(inp); 819 INP_INFO_WUNLOCK(&V_ripcbinfo); 820 INP_WUNLOCK(inp); 821 return (0); 822 } 823 824 static void 825 rip_detach(struct socket *so) 826 { 827 struct inpcb *inp; 828 829 inp = sotoinpcb(so); 830 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 831 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 832 ("rip_detach: not closed")); 833 834 INP_INFO_WLOCK(&V_ripcbinfo); 835 INP_WLOCK(inp); 836 rip_delhash(inp); 837 if (so == V_ip_mrouter && ip_mrouter_done) 838 ip_mrouter_done(); 839 if (ip_rsvp_force_done) 840 ip_rsvp_force_done(so); 841 if (so == V_ip_rsvpd) 842 ip_rsvp_done(); 843 in_pcbdetach(inp); 844 in_pcbfree(inp); 845 INP_INFO_WUNLOCK(&V_ripcbinfo); 846 } 847 848 static void 849 rip_dodisconnect(struct socket *so, struct inpcb *inp) 850 { 851 struct inpcbinfo *pcbinfo; 852 853 pcbinfo = inp->inp_pcbinfo; 854 INP_INFO_WLOCK(pcbinfo); 855 INP_WLOCK(inp); 856 rip_delhash(inp); 857 inp->inp_faddr.s_addr = INADDR_ANY; 858 rip_inshash(inp); 859 SOCK_LOCK(so); 860 so->so_state &= ~SS_ISCONNECTED; 861 SOCK_UNLOCK(so); 862 INP_WUNLOCK(inp); 863 INP_INFO_WUNLOCK(pcbinfo); 864 } 865 866 static void 867 rip_abort(struct socket *so) 868 { 869 struct inpcb *inp; 870 871 inp = sotoinpcb(so); 872 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 873 874 rip_dodisconnect(so, inp); 875 } 876 877 static void 878 rip_close(struct socket *so) 879 { 880 struct inpcb *inp; 881 882 inp = sotoinpcb(so); 883 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 884 885 rip_dodisconnect(so, inp); 886 } 887 888 static int 889 rip_disconnect(struct socket *so) 890 { 891 struct inpcb *inp; 892 893 if ((so->so_state & SS_ISCONNECTED) == 0) 894 return (ENOTCONN); 895 896 inp = sotoinpcb(so); 897 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 898 899 rip_dodisconnect(so, inp); 900 return (0); 901 } 902 903 static int 904 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 905 { 906 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 907 struct inpcb *inp; 908 int error; 909 910 if (nam->sa_len != sizeof(*addr)) 911 return (EINVAL); 912 913 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 914 if (error != 0) 915 return (error); 916 917 inp = sotoinpcb(so); 918 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 919 920 if (TAILQ_EMPTY(&V_ifnet) || 921 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 922 (addr->sin_addr.s_addr && 923 (inp->inp_flags & INP_BINDANY) == 0 && 924 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 925 return (EADDRNOTAVAIL); 926 927 INP_INFO_WLOCK(&V_ripcbinfo); 928 INP_WLOCK(inp); 929 rip_delhash(inp); 930 inp->inp_laddr = addr->sin_addr; 931 rip_inshash(inp); 932 INP_WUNLOCK(inp); 933 INP_INFO_WUNLOCK(&V_ripcbinfo); 934 return (0); 935 } 936 937 static int 938 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 939 { 940 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 941 struct inpcb *inp; 942 943 if (nam->sa_len != sizeof(*addr)) 944 return (EINVAL); 945 if (TAILQ_EMPTY(&V_ifnet)) 946 return (EADDRNOTAVAIL); 947 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 948 return (EAFNOSUPPORT); 949 950 inp = sotoinpcb(so); 951 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 952 953 INP_INFO_WLOCK(&V_ripcbinfo); 954 INP_WLOCK(inp); 955 rip_delhash(inp); 956 inp->inp_faddr = addr->sin_addr; 957 rip_inshash(inp); 958 soisconnected(so); 959 INP_WUNLOCK(inp); 960 INP_INFO_WUNLOCK(&V_ripcbinfo); 961 return (0); 962 } 963 964 static int 965 rip_shutdown(struct socket *so) 966 { 967 struct inpcb *inp; 968 969 inp = sotoinpcb(so); 970 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 971 972 INP_WLOCK(inp); 973 socantsendmore(so); 974 INP_WUNLOCK(inp); 975 return (0); 976 } 977 978 static int 979 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 980 struct mbuf *control, struct thread *td) 981 { 982 struct inpcb *inp; 983 u_long dst; 984 985 inp = sotoinpcb(so); 986 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 987 988 /* 989 * Note: 'dst' reads below are unlocked. 990 */ 991 if (so->so_state & SS_ISCONNECTED) { 992 if (nam) { 993 m_freem(m); 994 return (EISCONN); 995 } 996 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 997 } else { 998 if (nam == NULL) { 999 m_freem(m); 1000 return (ENOTCONN); 1001 } 1002 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1003 } 1004 return (rip_output(m, so, dst)); 1005 } 1006 #endif /* INET */ 1007 1008 static int 1009 rip_pcblist(SYSCTL_HANDLER_ARGS) 1010 { 1011 int error, i, n; 1012 struct inpcb *inp, **inp_list; 1013 inp_gen_t gencnt; 1014 struct xinpgen xig; 1015 1016 /* 1017 * The process of preparing the TCB list is too time-consuming and 1018 * resource-intensive to repeat twice on every request. 1019 */ 1020 if (req->oldptr == 0) { 1021 n = V_ripcbinfo.ipi_count; 1022 n += imax(n / 8, 10); 1023 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1024 return (0); 1025 } 1026 1027 if (req->newptr != 0) 1028 return (EPERM); 1029 1030 /* 1031 * OK, now we're committed to doing something. 1032 */ 1033 INP_INFO_RLOCK(&V_ripcbinfo); 1034 gencnt = V_ripcbinfo.ipi_gencnt; 1035 n = V_ripcbinfo.ipi_count; 1036 INP_INFO_RUNLOCK(&V_ripcbinfo); 1037 1038 xig.xig_len = sizeof xig; 1039 xig.xig_count = n; 1040 xig.xig_gen = gencnt; 1041 xig.xig_sogen = so_gencnt; 1042 error = SYSCTL_OUT(req, &xig, sizeof xig); 1043 if (error) 1044 return (error); 1045 1046 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 1047 if (inp_list == 0) 1048 return (ENOMEM); 1049 1050 INP_INFO_RLOCK(&V_ripcbinfo); 1051 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 1052 inp = LIST_NEXT(inp, inp_list)) { 1053 INP_WLOCK(inp); 1054 if (inp->inp_gencnt <= gencnt && 1055 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1056 in_pcbref(inp); 1057 inp_list[i++] = inp; 1058 } 1059 INP_WUNLOCK(inp); 1060 } 1061 INP_INFO_RUNLOCK(&V_ripcbinfo); 1062 n = i; 1063 1064 error = 0; 1065 for (i = 0; i < n; i++) { 1066 inp = inp_list[i]; 1067 INP_RLOCK(inp); 1068 if (inp->inp_gencnt <= gencnt) { 1069 struct xinpcb xi; 1070 1071 bzero(&xi, sizeof(xi)); 1072 xi.xi_len = sizeof xi; 1073 /* XXX should avoid extra copy */ 1074 bcopy(inp, &xi.xi_inp, sizeof *inp); 1075 if (inp->inp_socket) 1076 sotoxsocket(inp->inp_socket, &xi.xi_socket); 1077 INP_RUNLOCK(inp); 1078 error = SYSCTL_OUT(req, &xi, sizeof xi); 1079 } else 1080 INP_RUNLOCK(inp); 1081 } 1082 INP_INFO_WLOCK(&V_ripcbinfo); 1083 for (i = 0; i < n; i++) { 1084 inp = inp_list[i]; 1085 INP_RLOCK(inp); 1086 if (!in_pcbrele_rlocked(inp)) 1087 INP_RUNLOCK(inp); 1088 } 1089 INP_INFO_WUNLOCK(&V_ripcbinfo); 1090 1091 if (!error) { 1092 /* 1093 * Give the user an updated idea of our state. If the 1094 * generation differs from what we told her before, she knows 1095 * that something happened while we were processing this 1096 * request, and it might be necessary to retry. 1097 */ 1098 INP_INFO_RLOCK(&V_ripcbinfo); 1099 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1100 xig.xig_sogen = so_gencnt; 1101 xig.xig_count = V_ripcbinfo.ipi_count; 1102 INP_INFO_RUNLOCK(&V_ripcbinfo); 1103 error = SYSCTL_OUT(req, &xig, sizeof xig); 1104 } 1105 free(inp_list, M_TEMP); 1106 return (error); 1107 } 1108 1109 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1110 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 1111 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 1112 1113 #ifdef INET 1114 struct pr_usrreqs rip_usrreqs = { 1115 .pru_abort = rip_abort, 1116 .pru_attach = rip_attach, 1117 .pru_bind = rip_bind, 1118 .pru_connect = rip_connect, 1119 .pru_control = in_control, 1120 .pru_detach = rip_detach, 1121 .pru_disconnect = rip_disconnect, 1122 .pru_peeraddr = in_getpeeraddr, 1123 .pru_send = rip_send, 1124 .pru_shutdown = rip_shutdown, 1125 .pru_sockaddr = in_getsockaddr, 1126 .pru_sosetlabel = in_pcbsosetlabel, 1127 .pru_close = rip_close, 1128 }; 1129 #endif /* INET */ 1130