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_inet6.h" 37 #include "opt_ipsec.h" 38 39 #include <sys/param.h> 40 #include <sys/jail.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/rwlock.h> 49 #include <sys/signalvar.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/sx.h> 53 #include <sys/sysctl.h> 54 #include <sys/systm.h> 55 56 #include <vm/uma.h> 57 58 #include <net/if.h> 59 #include <net/route.h> 60 #include <net/vnet.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/in_pcb.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip_var.h> 68 #include <netinet/ip_mroute.h> 69 70 #ifdef IPSEC 71 #include <netipsec/ipsec.h> 72 #endif /*IPSEC*/ 73 74 #include <security/mac/mac_framework.h> 75 76 VNET_DEFINE(struct inpcbhead, ripcb); 77 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 78 79 #define V_ripcb VNET(ripcb) 80 #define V_ripcbinfo VNET(ripcbinfo) 81 82 /* 83 * Control and data hooks for ipfw, dummynet, divert and so on. 84 * The data hooks are not used here but it is convenient 85 * to keep them all in one place. 86 */ 87 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 88 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 89 90 int (*ip_dn_ctl_ptr)(struct sockopt *); 91 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 92 void (*ip_divert_ptr)(struct mbuf *, int); 93 int (*ng_ipfw_input_p)(struct mbuf **, int, 94 struct ip_fw_args *, int); 95 96 /* 97 * Hooks for multicast routing. They all default to NULL, so leave them not 98 * initialized and rely on BSS being set to 0. 99 */ 100 101 /* 102 * The socket used to communicate with the multicast routing daemon. 103 */ 104 VNET_DEFINE(struct socket *, ip_mrouter); 105 106 /* 107 * The various mrouter and rsvp functions. 108 */ 109 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 110 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 111 int (*ip_mrouter_done)(void); 112 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 113 struct ip_moptions *); 114 int (*mrt_ioctl)(u_long, caddr_t, int); 115 int (*legal_vif_num)(int); 116 u_long (*ip_mcast_src)(int); 117 118 void (*rsvp_input_p)(struct mbuf *m, int off); 119 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 120 void (*ip_rsvp_force_done)(struct socket *); 121 122 /* 123 * Hash functions 124 */ 125 126 #define INP_PCBHASH_RAW_SIZE 256 127 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 128 (((proto) + (laddr) + (faddr)) % (mask) + 1) 129 130 static void 131 rip_inshash(struct inpcb *inp) 132 { 133 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 134 struct inpcbhead *pcbhash; 135 int hash; 136 137 INP_INFO_WLOCK_ASSERT(pcbinfo); 138 INP_WLOCK_ASSERT(inp); 139 140 if (inp->inp_ip_p != 0 && 141 inp->inp_laddr.s_addr != INADDR_ANY && 142 inp->inp_faddr.s_addr != INADDR_ANY) { 143 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 144 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 145 } else 146 hash = 0; 147 pcbhash = &pcbinfo->ipi_hashbase[hash]; 148 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 149 } 150 151 static void 152 rip_delhash(struct inpcb *inp) 153 { 154 155 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 156 INP_WLOCK_ASSERT(inp); 157 158 LIST_REMOVE(inp, inp_hash); 159 } 160 161 /* 162 * Raw interface to IP protocol. 163 */ 164 165 /* 166 * Initialize raw connection block q. 167 */ 168 static void 169 rip_zone_change(void *tag) 170 { 171 172 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 173 } 174 175 static int 176 rip_inpcb_init(void *mem, int size, int flags) 177 { 178 struct inpcb *inp = mem; 179 180 INP_LOCK_INIT(inp, "inp", "rawinp"); 181 return (0); 182 } 183 184 void 185 rip_init(void) 186 { 187 188 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE, 189 1, "ripcb", rip_inpcb_init, NULL, UMA_ZONE_NOFREE); 190 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 191 EVENTHANDLER_PRI_ANY); 192 } 193 194 #ifdef VIMAGE 195 void 196 rip_destroy(void) 197 { 198 199 in_pcbinfo_destroy(&V_ripcbinfo); 200 } 201 #endif 202 203 static int 204 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 205 struct sockaddr_in *ripsrc) 206 { 207 int policyfail = 0; 208 209 INP_RLOCK_ASSERT(last); 210 211 #ifdef IPSEC 212 /* check AH/ESP integrity. */ 213 if (ipsec4_in_reject(n, last)) { 214 policyfail = 1; 215 } 216 #endif /* IPSEC */ 217 #ifdef MAC 218 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 219 policyfail = 1; 220 #endif 221 /* Check the minimum TTL for socket. */ 222 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 223 policyfail = 1; 224 if (!policyfail) { 225 struct mbuf *opts = NULL; 226 struct socket *so; 227 228 so = last->inp_socket; 229 if ((last->inp_flags & INP_CONTROLOPTS) || 230 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 231 ip_savecontrol(last, &opts, ip, n); 232 SOCKBUF_LOCK(&so->so_rcv); 233 if (sbappendaddr_locked(&so->so_rcv, 234 (struct sockaddr *)ripsrc, n, opts) == 0) { 235 /* should notify about lost packet */ 236 m_freem(n); 237 if (opts) 238 m_freem(opts); 239 SOCKBUF_UNLOCK(&so->so_rcv); 240 } else 241 sorwakeup_locked(so); 242 } else 243 m_freem(n); 244 return (policyfail); 245 } 246 247 /* 248 * Setup generic address and protocol structures for raw_input routine, then 249 * pass them along with mbuf chain. 250 */ 251 void 252 rip_input(struct mbuf *m, int off) 253 { 254 struct ifnet *ifp; 255 struct ip *ip = mtod(m, struct ip *); 256 int proto = ip->ip_p; 257 struct inpcb *inp, *last; 258 struct sockaddr_in ripsrc; 259 int hash; 260 261 bzero(&ripsrc, sizeof(ripsrc)); 262 ripsrc.sin_len = sizeof(ripsrc); 263 ripsrc.sin_family = AF_INET; 264 ripsrc.sin_addr = ip->ip_src; 265 last = NULL; 266 267 ifp = m->m_pkthdr.rcvif; 268 269 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 270 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 271 INP_INFO_RLOCK(&V_ripcbinfo); 272 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 273 if (inp->inp_ip_p != proto) 274 continue; 275 #ifdef INET6 276 /* XXX inp locking */ 277 if ((inp->inp_vflag & INP_IPV4) == 0) 278 continue; 279 #endif 280 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 281 continue; 282 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 283 continue; 284 if (jailed_without_vnet(inp->inp_cred)) { 285 /* 286 * XXX: If faddr was bound to multicast group, 287 * jailed raw socket will drop datagram. 288 */ 289 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 290 continue; 291 } 292 if (last != NULL) { 293 struct mbuf *n; 294 295 n = m_copy(m, 0, (int)M_COPYALL); 296 if (n != NULL) 297 (void) rip_append(last, ip, n, &ripsrc); 298 /* XXX count dropped packet */ 299 INP_RUNLOCK(last); 300 } 301 INP_RLOCK(inp); 302 last = inp; 303 } 304 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 305 if (inp->inp_ip_p && inp->inp_ip_p != proto) 306 continue; 307 #ifdef INET6 308 /* XXX inp locking */ 309 if ((inp->inp_vflag & INP_IPV4) == 0) 310 continue; 311 #endif 312 if (!in_nullhost(inp->inp_laddr) && 313 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 314 continue; 315 if (!in_nullhost(inp->inp_faddr) && 316 !in_hosteq(inp->inp_faddr, ip->ip_src)) 317 continue; 318 if (jailed_without_vnet(inp->inp_cred)) { 319 /* 320 * Allow raw socket in jail to receive multicast; 321 * assume process had PRIV_NETINET_RAW at attach, 322 * and fall through into normal filter path if so. 323 */ 324 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 325 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 326 continue; 327 } 328 /* 329 * If this raw socket has multicast state, and we 330 * have received a multicast, check if this socket 331 * should receive it, as multicast filtering is now 332 * the responsibility of the transport layer. 333 */ 334 if (inp->inp_moptions != NULL && 335 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 336 /* 337 * If the incoming datagram is for IGMP, allow it 338 * through unconditionally to the raw socket. 339 * 340 * In the case of IGMPv2, we may not have explicitly 341 * joined the group, and may have set IFF_ALLMULTI 342 * on the interface. imo_multi_filter() may discard 343 * control traffic we actually need to see. 344 * 345 * Userland multicast routing daemons should continue 346 * filter the control traffic appropriately. 347 */ 348 int blocked; 349 350 blocked = MCAST_PASS; 351 if (proto != IPPROTO_IGMP) { 352 struct sockaddr_in group; 353 354 bzero(&group, sizeof(struct sockaddr_in)); 355 group.sin_len = sizeof(struct sockaddr_in); 356 group.sin_family = AF_INET; 357 group.sin_addr = ip->ip_dst; 358 359 blocked = imo_multi_filter(inp->inp_moptions, 360 ifp, 361 (struct sockaddr *)&group, 362 (struct sockaddr *)&ripsrc); 363 } 364 365 if (blocked != MCAST_PASS) { 366 IPSTAT_INC(ips_notmember); 367 continue; 368 } 369 } 370 if (last != NULL) { 371 struct mbuf *n; 372 373 n = m_copy(m, 0, (int)M_COPYALL); 374 if (n != NULL) 375 (void) rip_append(last, ip, n, &ripsrc); 376 /* XXX count dropped packet */ 377 INP_RUNLOCK(last); 378 } 379 INP_RLOCK(inp); 380 last = inp; 381 } 382 INP_INFO_RUNLOCK(&V_ripcbinfo); 383 if (last != NULL) { 384 if (rip_append(last, ip, m, &ripsrc) != 0) 385 IPSTAT_INC(ips_delivered); 386 INP_RUNLOCK(last); 387 } else { 388 m_freem(m); 389 IPSTAT_INC(ips_noproto); 390 IPSTAT_DEC(ips_delivered); 391 } 392 } 393 394 /* 395 * Generate IP header and pass packet to ip_output. Tack on options user may 396 * have setup with control call. 397 */ 398 int 399 rip_output(struct mbuf *m, struct socket *so, u_long dst) 400 { 401 struct ip *ip; 402 int error; 403 struct inpcb *inp = sotoinpcb(so); 404 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 405 IP_ALLOWBROADCAST; 406 407 /* 408 * If the user handed us a complete IP packet, use it. Otherwise, 409 * allocate an mbuf for a header and fill it in. 410 */ 411 if ((inp->inp_flags & INP_HDRINCL) == 0) { 412 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 413 m_freem(m); 414 return(EMSGSIZE); 415 } 416 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 417 if (m == NULL) 418 return(ENOBUFS); 419 420 INP_RLOCK(inp); 421 ip = mtod(m, struct ip *); 422 ip->ip_tos = inp->inp_ip_tos; 423 if (inp->inp_flags & INP_DONTFRAG) 424 ip->ip_off = IP_DF; 425 else 426 ip->ip_off = 0; 427 ip->ip_p = inp->inp_ip_p; 428 ip->ip_len = m->m_pkthdr.len; 429 ip->ip_src = inp->inp_laddr; 430 if (jailed(inp->inp_cred)) { 431 /* 432 * prison_local_ip4() would be good enough but would 433 * let a source of INADDR_ANY pass, which we do not 434 * want to see from jails. We do not go through the 435 * pain of in_pcbladdr() for raw sockets. 436 */ 437 if (ip->ip_src.s_addr == INADDR_ANY) 438 error = prison_get_ip4(inp->inp_cred, 439 &ip->ip_src); 440 else 441 error = prison_local_ip4(inp->inp_cred, 442 &ip->ip_src); 443 if (error != 0) { 444 INP_RUNLOCK(inp); 445 m_freem(m); 446 return (error); 447 } 448 } 449 ip->ip_dst.s_addr = dst; 450 ip->ip_ttl = inp->inp_ip_ttl; 451 } else { 452 if (m->m_pkthdr.len > IP_MAXPACKET) { 453 m_freem(m); 454 return(EMSGSIZE); 455 } 456 INP_RLOCK(inp); 457 ip = mtod(m, struct ip *); 458 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 459 if (error != 0) { 460 INP_RUNLOCK(inp); 461 m_freem(m); 462 return (error); 463 } 464 465 /* 466 * Don't allow both user specified and setsockopt options, 467 * and don't allow packet length sizes that will crash. 468 */ 469 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 470 || (ip->ip_len > m->m_pkthdr.len) 471 || (ip->ip_len < (ip->ip_hl << 2))) { 472 INP_RUNLOCK(inp); 473 m_freem(m); 474 return (EINVAL); 475 } 476 if (ip->ip_id == 0) 477 ip->ip_id = ip_newid(); 478 479 /* 480 * XXX prevent ip_output from overwriting header fields. 481 */ 482 flags |= IP_RAWOUTPUT; 483 IPSTAT_INC(ips_rawout); 484 } 485 486 if (inp->inp_flags & INP_ONESBCAST) 487 flags |= IP_SENDONES; 488 489 #ifdef MAC 490 mac_inpcb_create_mbuf(inp, m); 491 #endif 492 493 error = ip_output(m, inp->inp_options, NULL, flags, 494 inp->inp_moptions, inp); 495 INP_RUNLOCK(inp); 496 return (error); 497 } 498 499 /* 500 * Raw IP socket option processing. 501 * 502 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 503 * only be created by a privileged process, and as such, socket option 504 * operations to manage system properties on any raw socket were allowed to 505 * take place without explicit additional access control checks. However, 506 * raw sockets can now also be created in jail(), and therefore explicit 507 * checks are now required. Likewise, raw sockets can be used by a process 508 * after it gives up privilege, so some caution is required. For options 509 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 510 * performed in ip_ctloutput() and therefore no check occurs here. 511 * Unilaterally checking priv_check() here breaks normal IP socket option 512 * operations on raw sockets. 513 * 514 * When adding new socket options here, make sure to add access control 515 * checks here as necessary. 516 */ 517 int 518 rip_ctloutput(struct socket *so, struct sockopt *sopt) 519 { 520 struct inpcb *inp = sotoinpcb(so); 521 int error, optval; 522 523 if (sopt->sopt_level != IPPROTO_IP) { 524 if ((sopt->sopt_level == SOL_SOCKET) && 525 (sopt->sopt_name == SO_SETFIB)) { 526 inp->inp_inc.inc_fibnum = so->so_fibnum; 527 return (0); 528 } 529 return (EINVAL); 530 } 531 532 error = 0; 533 switch (sopt->sopt_dir) { 534 case SOPT_GET: 535 switch (sopt->sopt_name) { 536 case IP_HDRINCL: 537 optval = inp->inp_flags & INP_HDRINCL; 538 error = sooptcopyout(sopt, &optval, sizeof optval); 539 break; 540 541 case IP_FW3: /* generic ipfw v.3 functions */ 542 case IP_FW_ADD: /* ADD actually returns the body... */ 543 case IP_FW_GET: 544 case IP_FW_TABLE_GETSIZE: 545 case IP_FW_TABLE_LIST: 546 case IP_FW_NAT_GET_CONFIG: 547 case IP_FW_NAT_GET_LOG: 548 if (V_ip_fw_ctl_ptr != NULL) 549 error = V_ip_fw_ctl_ptr(sopt); 550 else 551 error = ENOPROTOOPT; 552 break; 553 554 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 555 case IP_DUMMYNET_GET: 556 if (ip_dn_ctl_ptr != NULL) 557 error = ip_dn_ctl_ptr(sopt); 558 else 559 error = ENOPROTOOPT; 560 break ; 561 562 case MRT_INIT: 563 case MRT_DONE: 564 case MRT_ADD_VIF: 565 case MRT_DEL_VIF: 566 case MRT_ADD_MFC: 567 case MRT_DEL_MFC: 568 case MRT_VERSION: 569 case MRT_ASSERT: 570 case MRT_API_SUPPORT: 571 case MRT_API_CONFIG: 572 case MRT_ADD_BW_UPCALL: 573 case MRT_DEL_BW_UPCALL: 574 error = priv_check(curthread, PRIV_NETINET_MROUTE); 575 if (error != 0) 576 return (error); 577 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 578 EOPNOTSUPP; 579 break; 580 581 default: 582 error = ip_ctloutput(so, sopt); 583 break; 584 } 585 break; 586 587 case SOPT_SET: 588 switch (sopt->sopt_name) { 589 case IP_HDRINCL: 590 error = sooptcopyin(sopt, &optval, sizeof optval, 591 sizeof optval); 592 if (error) 593 break; 594 if (optval) 595 inp->inp_flags |= INP_HDRINCL; 596 else 597 inp->inp_flags &= ~INP_HDRINCL; 598 break; 599 600 case IP_FW3: /* generic ipfw v.3 functions */ 601 case IP_FW_ADD: 602 case IP_FW_DEL: 603 case IP_FW_FLUSH: 604 case IP_FW_ZERO: 605 case IP_FW_RESETLOG: 606 case IP_FW_TABLE_ADD: 607 case IP_FW_TABLE_DEL: 608 case IP_FW_TABLE_FLUSH: 609 case IP_FW_NAT_CFG: 610 case IP_FW_NAT_DEL: 611 if (V_ip_fw_ctl_ptr != NULL) 612 error = V_ip_fw_ctl_ptr(sopt); 613 else 614 error = ENOPROTOOPT; 615 break; 616 617 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 618 case IP_DUMMYNET_CONFIGURE: 619 case IP_DUMMYNET_DEL: 620 case IP_DUMMYNET_FLUSH: 621 if (ip_dn_ctl_ptr != NULL) 622 error = ip_dn_ctl_ptr(sopt); 623 else 624 error = ENOPROTOOPT ; 625 break ; 626 627 case IP_RSVP_ON: 628 error = priv_check(curthread, PRIV_NETINET_MROUTE); 629 if (error != 0) 630 return (error); 631 error = ip_rsvp_init(so); 632 break; 633 634 case IP_RSVP_OFF: 635 error = priv_check(curthread, PRIV_NETINET_MROUTE); 636 if (error != 0) 637 return (error); 638 error = ip_rsvp_done(); 639 break; 640 641 case IP_RSVP_VIF_ON: 642 case IP_RSVP_VIF_OFF: 643 error = priv_check(curthread, PRIV_NETINET_MROUTE); 644 if (error != 0) 645 return (error); 646 error = ip_rsvp_vif ? 647 ip_rsvp_vif(so, sopt) : EINVAL; 648 break; 649 650 case MRT_INIT: 651 case MRT_DONE: 652 case MRT_ADD_VIF: 653 case MRT_DEL_VIF: 654 case MRT_ADD_MFC: 655 case MRT_DEL_MFC: 656 case MRT_VERSION: 657 case MRT_ASSERT: 658 case MRT_API_SUPPORT: 659 case MRT_API_CONFIG: 660 case MRT_ADD_BW_UPCALL: 661 case MRT_DEL_BW_UPCALL: 662 error = priv_check(curthread, PRIV_NETINET_MROUTE); 663 if (error != 0) 664 return (error); 665 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 666 EOPNOTSUPP; 667 break; 668 669 default: 670 error = ip_ctloutput(so, sopt); 671 break; 672 } 673 break; 674 } 675 676 return (error); 677 } 678 679 /* 680 * This function exists solely to receive the PRC_IFDOWN messages which are 681 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 682 * in_ifadown() to remove all routes corresponding to that address. It also 683 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 684 * routes. 685 */ 686 void 687 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 688 { 689 struct in_ifaddr *ia; 690 struct ifnet *ifp; 691 int err; 692 int flags; 693 694 switch (cmd) { 695 case PRC_IFDOWN: 696 IN_IFADDR_RLOCK(); 697 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 698 if (ia->ia_ifa.ifa_addr == sa 699 && (ia->ia_flags & IFA_ROUTE)) { 700 ifa_ref(&ia->ia_ifa); 701 IN_IFADDR_RUNLOCK(); 702 /* 703 * in_ifscrub kills the interface route. 704 */ 705 in_ifscrub(ia->ia_ifp, ia); 706 /* 707 * in_ifadown gets rid of all the rest of the 708 * routes. This is not quite the right thing 709 * to do, but at least if we are running a 710 * routing process they will come back. 711 */ 712 in_ifadown(&ia->ia_ifa, 0); 713 ifa_free(&ia->ia_ifa); 714 break; 715 } 716 } 717 if (ia == NULL) /* If ia matched, already unlocked. */ 718 IN_IFADDR_RUNLOCK(); 719 break; 720 721 case PRC_IFUP: 722 IN_IFADDR_RLOCK(); 723 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 724 if (ia->ia_ifa.ifa_addr == sa) 725 break; 726 } 727 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { 728 IN_IFADDR_RUNLOCK(); 729 return; 730 } 731 ifa_ref(&ia->ia_ifa); 732 IN_IFADDR_RUNLOCK(); 733 flags = RTF_UP; 734 ifp = ia->ia_ifa.ifa_ifp; 735 736 if ((ifp->if_flags & IFF_LOOPBACK) 737 || (ifp->if_flags & IFF_POINTOPOINT)) 738 flags |= RTF_HOST; 739 740 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 741 if (err == 0) 742 ia->ia_flags |= IFA_ROUTE; 743 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 744 ifa_free(&ia->ia_ifa); 745 break; 746 } 747 } 748 749 u_long rip_sendspace = 9216; 750 u_long rip_recvspace = 9216; 751 752 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 753 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 754 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 755 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 756 757 static int 758 rip_attach(struct socket *so, int proto, struct thread *td) 759 { 760 struct inpcb *inp; 761 int error; 762 763 inp = sotoinpcb(so); 764 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 765 766 error = priv_check(td, PRIV_NETINET_RAW); 767 if (error) 768 return (error); 769 if (proto >= IPPROTO_MAX || proto < 0) 770 return EPROTONOSUPPORT; 771 error = soreserve(so, rip_sendspace, rip_recvspace); 772 if (error) 773 return (error); 774 INP_INFO_WLOCK(&V_ripcbinfo); 775 error = in_pcballoc(so, &V_ripcbinfo); 776 if (error) { 777 INP_INFO_WUNLOCK(&V_ripcbinfo); 778 return (error); 779 } 780 inp = (struct inpcb *)so->so_pcb; 781 inp->inp_vflag |= INP_IPV4; 782 inp->inp_ip_p = proto; 783 inp->inp_ip_ttl = V_ip_defttl; 784 rip_inshash(inp); 785 INP_INFO_WUNLOCK(&V_ripcbinfo); 786 INP_WUNLOCK(inp); 787 return (0); 788 } 789 790 static void 791 rip_detach(struct socket *so) 792 { 793 struct inpcb *inp; 794 795 inp = sotoinpcb(so); 796 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 797 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 798 ("rip_detach: not closed")); 799 800 INP_INFO_WLOCK(&V_ripcbinfo); 801 INP_WLOCK(inp); 802 rip_delhash(inp); 803 if (so == V_ip_mrouter && ip_mrouter_done) 804 ip_mrouter_done(); 805 if (ip_rsvp_force_done) 806 ip_rsvp_force_done(so); 807 if (so == V_ip_rsvpd) 808 ip_rsvp_done(); 809 in_pcbdetach(inp); 810 in_pcbfree(inp); 811 INP_INFO_WUNLOCK(&V_ripcbinfo); 812 } 813 814 static void 815 rip_dodisconnect(struct socket *so, struct inpcb *inp) 816 { 817 818 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 819 INP_WLOCK_ASSERT(inp); 820 821 rip_delhash(inp); 822 inp->inp_faddr.s_addr = INADDR_ANY; 823 rip_inshash(inp); 824 SOCK_LOCK(so); 825 so->so_state &= ~SS_ISCONNECTED; 826 SOCK_UNLOCK(so); 827 } 828 829 static void 830 rip_abort(struct socket *so) 831 { 832 struct inpcb *inp; 833 834 inp = sotoinpcb(so); 835 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 836 837 INP_INFO_WLOCK(&V_ripcbinfo); 838 INP_WLOCK(inp); 839 rip_dodisconnect(so, inp); 840 INP_WUNLOCK(inp); 841 INP_INFO_WUNLOCK(&V_ripcbinfo); 842 } 843 844 static void 845 rip_close(struct socket *so) 846 { 847 struct inpcb *inp; 848 849 inp = sotoinpcb(so); 850 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 851 852 INP_INFO_WLOCK(&V_ripcbinfo); 853 INP_WLOCK(inp); 854 rip_dodisconnect(so, inp); 855 INP_WUNLOCK(inp); 856 INP_INFO_WUNLOCK(&V_ripcbinfo); 857 } 858 859 static int 860 rip_disconnect(struct socket *so) 861 { 862 struct inpcb *inp; 863 864 if ((so->so_state & SS_ISCONNECTED) == 0) 865 return (ENOTCONN); 866 867 inp = sotoinpcb(so); 868 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 869 870 INP_INFO_WLOCK(&V_ripcbinfo); 871 INP_WLOCK(inp); 872 rip_dodisconnect(so, inp); 873 INP_WUNLOCK(inp); 874 INP_INFO_WUNLOCK(&V_ripcbinfo); 875 return (0); 876 } 877 878 static int 879 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 880 { 881 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 882 struct inpcb *inp; 883 int error; 884 885 if (nam->sa_len != sizeof(*addr)) 886 return (EINVAL); 887 888 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 889 if (error != 0) 890 return (error); 891 892 inp = sotoinpcb(so); 893 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 894 895 if (TAILQ_EMPTY(&V_ifnet) || 896 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 897 (addr->sin_addr.s_addr && 898 (inp->inp_flags & INP_BINDANY) == 0 && 899 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 900 return (EADDRNOTAVAIL); 901 902 INP_INFO_WLOCK(&V_ripcbinfo); 903 INP_WLOCK(inp); 904 rip_delhash(inp); 905 inp->inp_laddr = addr->sin_addr; 906 rip_inshash(inp); 907 INP_WUNLOCK(inp); 908 INP_INFO_WUNLOCK(&V_ripcbinfo); 909 return (0); 910 } 911 912 static int 913 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 914 { 915 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 916 struct inpcb *inp; 917 918 if (nam->sa_len != sizeof(*addr)) 919 return (EINVAL); 920 if (TAILQ_EMPTY(&V_ifnet)) 921 return (EADDRNOTAVAIL); 922 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 923 return (EAFNOSUPPORT); 924 925 inp = sotoinpcb(so); 926 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 927 928 INP_INFO_WLOCK(&V_ripcbinfo); 929 INP_WLOCK(inp); 930 rip_delhash(inp); 931 inp->inp_faddr = addr->sin_addr; 932 rip_inshash(inp); 933 soisconnected(so); 934 INP_WUNLOCK(inp); 935 INP_INFO_WUNLOCK(&V_ripcbinfo); 936 return (0); 937 } 938 939 static int 940 rip_shutdown(struct socket *so) 941 { 942 struct inpcb *inp; 943 944 inp = sotoinpcb(so); 945 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 946 947 INP_WLOCK(inp); 948 socantsendmore(so); 949 INP_WUNLOCK(inp); 950 return (0); 951 } 952 953 static int 954 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 955 struct mbuf *control, struct thread *td) 956 { 957 struct inpcb *inp; 958 u_long dst; 959 960 inp = sotoinpcb(so); 961 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 962 963 /* 964 * Note: 'dst' reads below are unlocked. 965 */ 966 if (so->so_state & SS_ISCONNECTED) { 967 if (nam) { 968 m_freem(m); 969 return (EISCONN); 970 } 971 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 972 } else { 973 if (nam == NULL) { 974 m_freem(m); 975 return (ENOTCONN); 976 } 977 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 978 } 979 return (rip_output(m, so, dst)); 980 } 981 982 static int 983 rip_pcblist(SYSCTL_HANDLER_ARGS) 984 { 985 int error, i, n; 986 struct inpcb *inp, **inp_list; 987 inp_gen_t gencnt; 988 struct xinpgen xig; 989 990 /* 991 * The process of preparing the TCB list is too time-consuming and 992 * resource-intensive to repeat twice on every request. 993 */ 994 if (req->oldptr == 0) { 995 n = V_ripcbinfo.ipi_count; 996 n += imax(n / 8, 10); 997 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 998 return (0); 999 } 1000 1001 if (req->newptr != 0) 1002 return (EPERM); 1003 1004 /* 1005 * OK, now we're committed to doing something. 1006 */ 1007 INP_INFO_RLOCK(&V_ripcbinfo); 1008 gencnt = V_ripcbinfo.ipi_gencnt; 1009 n = V_ripcbinfo.ipi_count; 1010 INP_INFO_RUNLOCK(&V_ripcbinfo); 1011 1012 xig.xig_len = sizeof xig; 1013 xig.xig_count = n; 1014 xig.xig_gen = gencnt; 1015 xig.xig_sogen = so_gencnt; 1016 error = SYSCTL_OUT(req, &xig, sizeof xig); 1017 if (error) 1018 return (error); 1019 1020 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 1021 if (inp_list == 0) 1022 return (ENOMEM); 1023 1024 INP_INFO_RLOCK(&V_ripcbinfo); 1025 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 1026 inp = LIST_NEXT(inp, inp_list)) { 1027 INP_WLOCK(inp); 1028 if (inp->inp_gencnt <= gencnt && 1029 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1030 in_pcbref(inp); 1031 inp_list[i++] = inp; 1032 } 1033 INP_WUNLOCK(inp); 1034 } 1035 INP_INFO_RUNLOCK(&V_ripcbinfo); 1036 n = i; 1037 1038 error = 0; 1039 for (i = 0; i < n; i++) { 1040 inp = inp_list[i]; 1041 INP_RLOCK(inp); 1042 if (inp->inp_gencnt <= gencnt) { 1043 struct xinpcb xi; 1044 1045 bzero(&xi, sizeof(xi)); 1046 xi.xi_len = sizeof xi; 1047 /* XXX should avoid extra copy */ 1048 bcopy(inp, &xi.xi_inp, sizeof *inp); 1049 if (inp->inp_socket) 1050 sotoxsocket(inp->inp_socket, &xi.xi_socket); 1051 INP_RUNLOCK(inp); 1052 error = SYSCTL_OUT(req, &xi, sizeof xi); 1053 } else 1054 INP_RUNLOCK(inp); 1055 } 1056 INP_INFO_WLOCK(&V_ripcbinfo); 1057 for (i = 0; i < n; i++) { 1058 inp = inp_list[i]; 1059 INP_WLOCK(inp); 1060 if (!in_pcbrele(inp)) 1061 INP_WUNLOCK(inp); 1062 } 1063 INP_INFO_WUNLOCK(&V_ripcbinfo); 1064 1065 if (!error) { 1066 /* 1067 * Give the user an updated idea of our state. If the 1068 * generation differs from what we told her before, she knows 1069 * that something happened while we were processing this 1070 * request, and it might be necessary to retry. 1071 */ 1072 INP_INFO_RLOCK(&V_ripcbinfo); 1073 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1074 xig.xig_sogen = so_gencnt; 1075 xig.xig_count = V_ripcbinfo.ipi_count; 1076 INP_INFO_RUNLOCK(&V_ripcbinfo); 1077 error = SYSCTL_OUT(req, &xig, sizeof xig); 1078 } 1079 free(inp_list, M_TEMP); 1080 return (error); 1081 } 1082 1083 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 1084 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 1085 1086 struct pr_usrreqs rip_usrreqs = { 1087 .pru_abort = rip_abort, 1088 .pru_attach = rip_attach, 1089 .pru_bind = rip_bind, 1090 .pru_connect = rip_connect, 1091 .pru_control = in_control, 1092 .pru_detach = rip_detach, 1093 .pru_disconnect = rip_disconnect, 1094 .pru_peeraddr = in_getpeeraddr, 1095 .pru_send = rip_send, 1096 .pru_shutdown = rip_shutdown, 1097 .pru_sockaddr = in_getsockaddr, 1098 .pru_sosetlabel = in_pcbsosetlabel, 1099 .pru_close = rip_close, 1100 }; 1101