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sys/netinet/raw_ip.c
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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: releng/8.4/sys/netinet/raw_ip.c 231391 2012-02-10 17:49:14Z tuexen $"); 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/if_ether.h> 67 #include <netinet/ip.h> 68 #include <netinet/ip_var.h> 69 #include <netinet/ip_mroute.h> 70 71 #ifdef IPSEC 72 #include <netipsec/ipsec.h> 73 #endif /*IPSEC*/ 74 75 #include <security/mac/mac_framework.h> 76 77 VNET_DEFINE(struct inpcbhead, ripcb); 78 VNET_DEFINE(struct inpcbinfo, ripcbinfo); 79 80 #define V_ripcb VNET(ripcb) 81 #define V_ripcbinfo VNET(ripcbinfo) 82 83 /* 84 * Control and data hooks for ipfw, dummynet, divert and so on. 85 * The data hooks are not used here but it is convenient 86 * to keep them all in one place. 87 */ 88 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL; 89 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL; 90 91 int (*ip_dn_ctl_ptr)(struct sockopt *); 92 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *); 93 void (*ip_divert_ptr)(struct mbuf *, int); 94 int (*ng_ipfw_input_p)(struct mbuf **, int, 95 struct ip_fw_args *, int); 96 97 /* 98 * Hooks for multicast routing. They all default to NULL, so leave them not 99 * initialized and rely on BSS being set to 0. 100 */ 101 102 /* 103 * The socket used to communicate with the multicast routing daemon. 104 */ 105 VNET_DEFINE(struct socket *, ip_mrouter); 106 107 /* 108 * The various mrouter and rsvp functions. 109 */ 110 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 111 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 112 int (*ip_mrouter_done)(void); 113 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 114 struct ip_moptions *); 115 int (*mrt_ioctl)(u_long, caddr_t, int); 116 int (*legal_vif_num)(int); 117 u_long (*ip_mcast_src)(int); 118 119 void (*rsvp_input_p)(struct mbuf *m, int off); 120 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 121 void (*ip_rsvp_force_done)(struct socket *); 122 123 /* 124 * Hash functions 125 */ 126 127 #define INP_PCBHASH_RAW_SIZE 256 128 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 129 (((proto) + (laddr) + (faddr)) % (mask) + 1) 130 131 static void 132 rip_inshash(struct inpcb *inp) 133 { 134 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 135 struct inpcbhead *pcbhash; 136 int hash; 137 138 INP_INFO_WLOCK_ASSERT(pcbinfo); 139 INP_WLOCK_ASSERT(inp); 140 141 if (inp->inp_ip_p != 0 && 142 inp->inp_laddr.s_addr != INADDR_ANY && 143 inp->inp_faddr.s_addr != INADDR_ANY) { 144 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 145 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 146 } else 147 hash = 0; 148 pcbhash = &pcbinfo->ipi_hashbase[hash]; 149 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 150 } 151 152 static void 153 rip_delhash(struct inpcb *inp) 154 { 155 156 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 157 INP_WLOCK_ASSERT(inp); 158 159 LIST_REMOVE(inp, inp_hash); 160 } 161 162 /* 163 * Raw interface to IP protocol. 164 */ 165 166 /* 167 * Initialize raw connection block q. 168 */ 169 static void 170 rip_zone_change(void *tag) 171 { 172 173 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 174 } 175 176 static int 177 rip_inpcb_init(void *mem, int size, int flags) 178 { 179 struct inpcb *inp = mem; 180 181 INP_LOCK_INIT(inp, "inp", "rawinp"); 182 return (0); 183 } 184 185 void 186 rip_init(void) 187 { 188 189 INP_INFO_LOCK_INIT(&V_ripcbinfo, "rip"); 190 LIST_INIT(&V_ripcb); 191 #ifdef VIMAGE 192 V_ripcbinfo.ipi_vnet = curvnet; 193 #endif 194 V_ripcbinfo.ipi_listhead = &V_ripcb; 195 V_ripcbinfo.ipi_hashbase = 196 hashinit(INP_PCBHASH_RAW_SIZE, M_PCB, &V_ripcbinfo.ipi_hashmask); 197 V_ripcbinfo.ipi_porthashbase = 198 hashinit(1, M_PCB, &V_ripcbinfo.ipi_porthashmask); 199 V_ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 200 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 201 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 202 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 203 EVENTHANDLER_PRI_ANY); 204 } 205 206 #ifdef VIMAGE 207 void 208 rip_destroy(void) 209 { 210 211 hashdestroy(V_ripcbinfo.ipi_hashbase, M_PCB, 212 V_ripcbinfo.ipi_hashmask); 213 hashdestroy(V_ripcbinfo.ipi_porthashbase, M_PCB, 214 V_ripcbinfo.ipi_porthashmask); 215 } 216 #endif 217 218 static int 219 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 220 struct sockaddr_in *ripsrc) 221 { 222 int policyfail = 0; 223 224 INP_RLOCK_ASSERT(last); 225 226 #ifdef IPSEC 227 /* check AH/ESP integrity. */ 228 if (ipsec4_in_reject(n, last)) { 229 policyfail = 1; 230 } 231 #endif /* IPSEC */ 232 #ifdef MAC 233 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 234 policyfail = 1; 235 #endif 236 /* Check the minimum TTL for socket. */ 237 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 238 policyfail = 1; 239 if (!policyfail) { 240 struct mbuf *opts = NULL; 241 struct socket *so; 242 243 so = last->inp_socket; 244 if ((last->inp_flags & INP_CONTROLOPTS) || 245 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 246 ip_savecontrol(last, &opts, ip, n); 247 SOCKBUF_LOCK(&so->so_rcv); 248 if (sbappendaddr_locked(&so->so_rcv, 249 (struct sockaddr *)ripsrc, n, opts) == 0) { 250 /* should notify about lost packet */ 251 m_freem(n); 252 if (opts) 253 m_freem(opts); 254 SOCKBUF_UNLOCK(&so->so_rcv); 255 } else 256 sorwakeup_locked(so); 257 } else 258 m_freem(n); 259 return (policyfail); 260 } 261 262 /* 263 * Setup generic address and protocol structures for raw_input routine, then 264 * pass them along with mbuf chain. 265 */ 266 void 267 rip_input(struct mbuf *m, int off) 268 { 269 struct ifnet *ifp; 270 struct ip *ip = mtod(m, struct ip *); 271 int proto = ip->ip_p; 272 struct inpcb *inp, *last; 273 struct sockaddr_in ripsrc; 274 int hash; 275 276 bzero(&ripsrc, sizeof(ripsrc)); 277 ripsrc.sin_len = sizeof(ripsrc); 278 ripsrc.sin_family = AF_INET; 279 ripsrc.sin_addr = ip->ip_src; 280 last = NULL; 281 282 ifp = m->m_pkthdr.rcvif; 283 284 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 285 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 286 INP_INFO_RLOCK(&V_ripcbinfo); 287 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 288 if (inp->inp_ip_p != proto) 289 continue; 290 #ifdef INET6 291 /* XXX inp locking */ 292 if ((inp->inp_vflag & INP_IPV4) == 0) 293 continue; 294 #endif 295 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 296 continue; 297 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 298 continue; 299 if (jailed_without_vnet(inp->inp_cred)) { 300 /* 301 * XXX: If faddr was bound to multicast group, 302 * jailed raw socket will drop datagram. 303 */ 304 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 305 continue; 306 } 307 if (last != NULL) { 308 struct mbuf *n; 309 310 n = m_copy(m, 0, (int)M_COPYALL); 311 if (n != NULL) 312 (void) rip_append(last, ip, n, &ripsrc); 313 /* XXX count dropped packet */ 314 INP_RUNLOCK(last); 315 } 316 INP_RLOCK(inp); 317 last = inp; 318 } 319 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 320 if (inp->inp_ip_p && inp->inp_ip_p != proto) 321 continue; 322 #ifdef INET6 323 /* XXX inp locking */ 324 if ((inp->inp_vflag & INP_IPV4) == 0) 325 continue; 326 #endif 327 if (!in_nullhost(inp->inp_laddr) && 328 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 329 continue; 330 if (!in_nullhost(inp->inp_faddr) && 331 !in_hosteq(inp->inp_faddr, ip->ip_src)) 332 continue; 333 if (jailed_without_vnet(inp->inp_cred)) { 334 /* 335 * Allow raw socket in jail to receive multicast; 336 * assume process had PRIV_NETINET_RAW at attach, 337 * and fall through into normal filter path if so. 338 */ 339 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 340 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 341 continue; 342 } 343 /* 344 * If this raw socket has multicast state, and we 345 * have received a multicast, check if this socket 346 * should receive it, as multicast filtering is now 347 * the responsibility of the transport layer. 348 */ 349 if (inp->inp_moptions != NULL && 350 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 351 /* 352 * If the incoming datagram is for IGMP, allow it 353 * through unconditionally to the raw socket. 354 * 355 * In the case of IGMPv2, we may not have explicitly 356 * joined the group, and may have set IFF_ALLMULTI 357 * on the interface. imo_multi_filter() may discard 358 * control traffic we actually need to see. 359 * 360 * Userland multicast routing daemons should continue 361 * filter the control traffic appropriately. 362 */ 363 int blocked; 364 365 blocked = MCAST_PASS; 366 if (proto != IPPROTO_IGMP) { 367 struct sockaddr_in group; 368 369 bzero(&group, sizeof(struct sockaddr_in)); 370 group.sin_len = sizeof(struct sockaddr_in); 371 group.sin_family = AF_INET; 372 group.sin_addr = ip->ip_dst; 373 374 blocked = imo_multi_filter(inp->inp_moptions, 375 ifp, 376 (struct sockaddr *)&group, 377 (struct sockaddr *)&ripsrc); 378 } 379 380 if (blocked != MCAST_PASS) { 381 IPSTAT_INC(ips_notmember); 382 continue; 383 } 384 } 385 if (last != NULL) { 386 struct mbuf *n; 387 388 n = m_copy(m, 0, (int)M_COPYALL); 389 if (n != NULL) 390 (void) rip_append(last, ip, n, &ripsrc); 391 /* XXX count dropped packet */ 392 INP_RUNLOCK(last); 393 } 394 INP_RLOCK(inp); 395 last = inp; 396 } 397 INP_INFO_RUNLOCK(&V_ripcbinfo); 398 if (last != NULL) { 399 if (rip_append(last, ip, m, &ripsrc) != 0) 400 IPSTAT_INC(ips_delivered); 401 INP_RUNLOCK(last); 402 } else { 403 m_freem(m); 404 IPSTAT_INC(ips_noproto); 405 IPSTAT_DEC(ips_delivered); 406 } 407 } 408 409 /* 410 * Generate IP header and pass packet to ip_output. Tack on options user may 411 * have setup with control call. 412 */ 413 int 414 rip_output(struct mbuf *m, struct socket *so, u_long dst) 415 { 416 struct ip *ip; 417 int error; 418 struct inpcb *inp = sotoinpcb(so); 419 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 420 IP_ALLOWBROADCAST; 421 422 /* 423 * If the user handed us a complete IP packet, use it. Otherwise, 424 * allocate an mbuf for a header and fill it in. 425 */ 426 if ((inp->inp_flags & INP_HDRINCL) == 0) { 427 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 428 m_freem(m); 429 return(EMSGSIZE); 430 } 431 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 432 if (m == NULL) 433 return(ENOBUFS); 434 435 INP_RLOCK(inp); 436 ip = mtod(m, struct ip *); 437 ip->ip_tos = inp->inp_ip_tos; 438 if (inp->inp_flags & INP_DONTFRAG) 439 ip->ip_off = IP_DF; 440 else 441 ip->ip_off = 0; 442 ip->ip_p = inp->inp_ip_p; 443 ip->ip_len = m->m_pkthdr.len; 444 ip->ip_src = inp->inp_laddr; 445 if (jailed(inp->inp_cred)) { 446 /* 447 * prison_local_ip4() would be good enough but would 448 * let a source of INADDR_ANY pass, which we do not 449 * want to see from jails. We do not go through the 450 * pain of in_pcbladdr() for raw sockets. 451 */ 452 if (ip->ip_src.s_addr == INADDR_ANY) 453 error = prison_get_ip4(inp->inp_cred, 454 &ip->ip_src); 455 else 456 error = prison_local_ip4(inp->inp_cred, 457 &ip->ip_src); 458 if (error != 0) { 459 INP_RUNLOCK(inp); 460 m_freem(m); 461 return (error); 462 } 463 } 464 ip->ip_dst.s_addr = dst; 465 ip->ip_ttl = inp->inp_ip_ttl; 466 } else { 467 if (m->m_pkthdr.len > IP_MAXPACKET) { 468 m_freem(m); 469 return(EMSGSIZE); 470 } 471 INP_RLOCK(inp); 472 ip = mtod(m, struct ip *); 473 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 474 if (error != 0) { 475 INP_RUNLOCK(inp); 476 m_freem(m); 477 return (error); 478 } 479 480 /* 481 * Don't allow both user specified and setsockopt options, 482 * and don't allow packet length sizes that will crash. 483 */ 484 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 485 || (ip->ip_len > m->m_pkthdr.len) 486 || (ip->ip_len < (ip->ip_hl << 2))) { 487 INP_RUNLOCK(inp); 488 m_freem(m); 489 return (EINVAL); 490 } 491 if (ip->ip_id == 0) 492 ip->ip_id = ip_newid(); 493 494 /* 495 * XXX prevent ip_output from overwriting header fields. 496 */ 497 flags |= IP_RAWOUTPUT; 498 IPSTAT_INC(ips_rawout); 499 } 500 501 if (inp->inp_flags & INP_ONESBCAST) 502 flags |= IP_SENDONES; 503 504 #ifdef MAC 505 mac_inpcb_create_mbuf(inp, m); 506 #endif 507 508 error = ip_output(m, inp->inp_options, NULL, flags, 509 inp->inp_moptions, inp); 510 INP_RUNLOCK(inp); 511 return (error); 512 } 513 514 /* 515 * Raw IP socket option processing. 516 * 517 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 518 * only be created by a privileged process, and as such, socket option 519 * operations to manage system properties on any raw socket were allowed to 520 * take place without explicit additional access control checks. However, 521 * raw sockets can now also be created in jail(), and therefore explicit 522 * checks are now required. Likewise, raw sockets can be used by a process 523 * after it gives up privilege, so some caution is required. For options 524 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 525 * performed in ip_ctloutput() and therefore no check occurs here. 526 * Unilaterally checking priv_check() here breaks normal IP socket option 527 * operations on raw sockets. 528 * 529 * When adding new socket options here, make sure to add access control 530 * checks here as necessary. 531 */ 532 int 533 rip_ctloutput(struct socket *so, struct sockopt *sopt) 534 { 535 struct inpcb *inp = sotoinpcb(so); 536 int error, optval; 537 538 if (sopt->sopt_level != IPPROTO_IP) { 539 if ((sopt->sopt_level == SOL_SOCKET) && 540 (sopt->sopt_name == SO_SETFIB)) { 541 inp->inp_inc.inc_fibnum = so->so_fibnum; 542 return (0); 543 } 544 return (EINVAL); 545 } 546 547 error = 0; 548 switch (sopt->sopt_dir) { 549 case SOPT_GET: 550 switch (sopt->sopt_name) { 551 case IP_HDRINCL: 552 optval = inp->inp_flags & INP_HDRINCL; 553 error = sooptcopyout(sopt, &optval, sizeof optval); 554 break; 555 556 case IP_FW3: /* generic ipfw v.3 functions */ 557 case IP_FW_ADD: /* ADD actually returns the body... */ 558 case IP_FW_GET: 559 case IP_FW_TABLE_GETSIZE: 560 case IP_FW_TABLE_LIST: 561 case IP_FW_NAT_GET_CONFIG: 562 case IP_FW_NAT_GET_LOG: 563 if (V_ip_fw_ctl_ptr != NULL) 564 error = V_ip_fw_ctl_ptr(sopt); 565 else 566 error = ENOPROTOOPT; 567 break; 568 569 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 570 case IP_DUMMYNET_GET: 571 if (ip_dn_ctl_ptr != NULL) 572 error = ip_dn_ctl_ptr(sopt); 573 else 574 error = ENOPROTOOPT; 575 break ; 576 577 case MRT_INIT: 578 case MRT_DONE: 579 case MRT_ADD_VIF: 580 case MRT_DEL_VIF: 581 case MRT_ADD_MFC: 582 case MRT_DEL_MFC: 583 case MRT_VERSION: 584 case MRT_ASSERT: 585 case MRT_API_SUPPORT: 586 case MRT_API_CONFIG: 587 case MRT_ADD_BW_UPCALL: 588 case MRT_DEL_BW_UPCALL: 589 error = priv_check(curthread, PRIV_NETINET_MROUTE); 590 if (error != 0) 591 return (error); 592 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 593 EOPNOTSUPP; 594 break; 595 596 default: 597 error = ip_ctloutput(so, sopt); 598 break; 599 } 600 break; 601 602 case SOPT_SET: 603 switch (sopt->sopt_name) { 604 case IP_HDRINCL: 605 error = sooptcopyin(sopt, &optval, sizeof optval, 606 sizeof optval); 607 if (error) 608 break; 609 if (optval) 610 inp->inp_flags |= INP_HDRINCL; 611 else 612 inp->inp_flags &= ~INP_HDRINCL; 613 break; 614 615 case IP_FW3: /* generic ipfw v.3 functions */ 616 case IP_FW_ADD: 617 case IP_FW_DEL: 618 case IP_FW_FLUSH: 619 case IP_FW_ZERO: 620 case IP_FW_RESETLOG: 621 case IP_FW_TABLE_ADD: 622 case IP_FW_TABLE_DEL: 623 case IP_FW_TABLE_FLUSH: 624 case IP_FW_NAT_CFG: 625 case IP_FW_NAT_DEL: 626 if (V_ip_fw_ctl_ptr != NULL) 627 error = V_ip_fw_ctl_ptr(sopt); 628 else 629 error = ENOPROTOOPT; 630 break; 631 632 case IP_DUMMYNET3: /* generic dummynet v.3 functions */ 633 case IP_DUMMYNET_CONFIGURE: 634 case IP_DUMMYNET_DEL: 635 case IP_DUMMYNET_FLUSH: 636 if (ip_dn_ctl_ptr != NULL) 637 error = ip_dn_ctl_ptr(sopt); 638 else 639 error = ENOPROTOOPT ; 640 break ; 641 642 case IP_RSVP_ON: 643 error = priv_check(curthread, PRIV_NETINET_MROUTE); 644 if (error != 0) 645 return (error); 646 error = ip_rsvp_init(so); 647 break; 648 649 case IP_RSVP_OFF: 650 error = priv_check(curthread, PRIV_NETINET_MROUTE); 651 if (error != 0) 652 return (error); 653 error = ip_rsvp_done(); 654 break; 655 656 case IP_RSVP_VIF_ON: 657 case IP_RSVP_VIF_OFF: 658 error = priv_check(curthread, PRIV_NETINET_MROUTE); 659 if (error != 0) 660 return (error); 661 error = ip_rsvp_vif ? 662 ip_rsvp_vif(so, sopt) : EINVAL; 663 break; 664 665 case MRT_INIT: 666 case MRT_DONE: 667 case MRT_ADD_VIF: 668 case MRT_DEL_VIF: 669 case MRT_ADD_MFC: 670 case MRT_DEL_MFC: 671 case MRT_VERSION: 672 case MRT_ASSERT: 673 case MRT_API_SUPPORT: 674 case MRT_API_CONFIG: 675 case MRT_ADD_BW_UPCALL: 676 case MRT_DEL_BW_UPCALL: 677 error = priv_check(curthread, PRIV_NETINET_MROUTE); 678 if (error != 0) 679 return (error); 680 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 681 EOPNOTSUPP; 682 break; 683 684 default: 685 error = ip_ctloutput(so, sopt); 686 break; 687 } 688 break; 689 } 690 691 return (error); 692 } 693 694 /* 695 * This function exists solely to receive the PRC_IFDOWN messages which are 696 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 697 * in_ifadown() to remove all routes corresponding to that address. It also 698 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 699 * routes. 700 */ 701 void 702 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 703 { 704 struct in_ifaddr *ia; 705 struct ifnet *ifp; 706 int err; 707 int flags; 708 709 switch (cmd) { 710 case PRC_IFDOWN: 711 IN_IFADDR_RLOCK(); 712 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 713 if (ia->ia_ifa.ifa_addr == sa 714 && (ia->ia_flags & IFA_ROUTE)) { 715 ifa_ref(&ia->ia_ifa); 716 IN_IFADDR_RUNLOCK(); 717 /* 718 * in_ifscrub kills the interface route. 719 */ 720 in_ifscrub(ia->ia_ifp, ia, 0); 721 /* 722 * in_ifadown gets rid of all the rest of the 723 * routes. This is not quite the right thing 724 * to do, but at least if we are running a 725 * routing process they will come back. 726 */ 727 in_ifadown(&ia->ia_ifa, 0); 728 ifa_free(&ia->ia_ifa); 729 break; 730 } 731 } 732 if (ia == NULL) /* If ia matched, already unlocked. */ 733 IN_IFADDR_RUNLOCK(); 734 break; 735 736 case PRC_IFUP: 737 IN_IFADDR_RLOCK(); 738 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 739 if (ia->ia_ifa.ifa_addr == sa) 740 break; 741 } 742 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) { 743 IN_IFADDR_RUNLOCK(); 744 return; 745 } 746 ifa_ref(&ia->ia_ifa); 747 IN_IFADDR_RUNLOCK(); 748 flags = RTF_UP; 749 ifp = ia->ia_ifa.ifa_ifp; 750 751 if ((ifp->if_flags & IFF_LOOPBACK) 752 || (ifp->if_flags & IFF_POINTOPOINT)) 753 flags |= RTF_HOST; 754 755 err = ifa_del_loopback_route((struct ifaddr *)ia, sa); 756 if (err == 0) 757 ia->ia_flags &= ~IFA_RTSELF; 758 759 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 760 if (err == 0) 761 ia->ia_flags |= IFA_ROUTE; 762 763 err = ifa_add_loopback_route((struct ifaddr *)ia, sa); 764 if (err == 0) 765 ia->ia_flags |= IFA_RTSELF; 766 767 ifa_free(&ia->ia_ifa); 768 break; 769 } 770 } 771 772 u_long rip_sendspace = 9216; 773 u_long rip_recvspace = 9216; 774 775 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 776 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 777 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 778 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 779 780 static int 781 rip_attach(struct socket *so, int proto, struct thread *td) 782 { 783 struct inpcb *inp; 784 int error; 785 786 inp = sotoinpcb(so); 787 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 788 789 error = priv_check(td, PRIV_NETINET_RAW); 790 if (error) 791 return (error); 792 if (proto >= IPPROTO_MAX || proto < 0) 793 return EPROTONOSUPPORT; 794 error = soreserve(so, rip_sendspace, rip_recvspace); 795 if (error) 796 return (error); 797 INP_INFO_WLOCK(&V_ripcbinfo); 798 error = in_pcballoc(so, &V_ripcbinfo); 799 if (error) { 800 INP_INFO_WUNLOCK(&V_ripcbinfo); 801 return (error); 802 } 803 inp = (struct inpcb *)so->so_pcb; 804 inp->inp_vflag |= INP_IPV4; 805 inp->inp_ip_p = proto; 806 inp->inp_ip_ttl = V_ip_defttl; 807 rip_inshash(inp); 808 INP_INFO_WUNLOCK(&V_ripcbinfo); 809 INP_WUNLOCK(inp); 810 return (0); 811 } 812 813 static void 814 rip_detach(struct socket *so) 815 { 816 struct inpcb *inp; 817 818 inp = sotoinpcb(so); 819 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 820 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 821 ("rip_detach: not closed")); 822 823 INP_INFO_WLOCK(&V_ripcbinfo); 824 INP_WLOCK(inp); 825 rip_delhash(inp); 826 if (so == V_ip_mrouter && ip_mrouter_done) 827 ip_mrouter_done(); 828 if (ip_rsvp_force_done) 829 ip_rsvp_force_done(so); 830 if (so == V_ip_rsvpd) 831 ip_rsvp_done(); 832 in_pcbdetach(inp); 833 in_pcbfree(inp); 834 INP_INFO_WUNLOCK(&V_ripcbinfo); 835 } 836 837 static void 838 rip_dodisconnect(struct socket *so, struct inpcb *inp) 839 { 840 841 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 842 INP_WLOCK_ASSERT(inp); 843 844 rip_delhash(inp); 845 inp->inp_faddr.s_addr = INADDR_ANY; 846 rip_inshash(inp); 847 SOCK_LOCK(so); 848 so->so_state &= ~SS_ISCONNECTED; 849 SOCK_UNLOCK(so); 850 } 851 852 static void 853 rip_abort(struct socket *so) 854 { 855 struct inpcb *inp; 856 857 inp = sotoinpcb(so); 858 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 859 860 INP_INFO_WLOCK(&V_ripcbinfo); 861 INP_WLOCK(inp); 862 rip_dodisconnect(so, inp); 863 INP_WUNLOCK(inp); 864 INP_INFO_WUNLOCK(&V_ripcbinfo); 865 } 866 867 static void 868 rip_close(struct socket *so) 869 { 870 struct inpcb *inp; 871 872 inp = sotoinpcb(so); 873 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 874 875 INP_INFO_WLOCK(&V_ripcbinfo); 876 INP_WLOCK(inp); 877 rip_dodisconnect(so, inp); 878 INP_WUNLOCK(inp); 879 INP_INFO_WUNLOCK(&V_ripcbinfo); 880 } 881 882 static int 883 rip_disconnect(struct socket *so) 884 { 885 struct inpcb *inp; 886 887 if ((so->so_state & SS_ISCONNECTED) == 0) 888 return (ENOTCONN); 889 890 inp = sotoinpcb(so); 891 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 892 893 INP_INFO_WLOCK(&V_ripcbinfo); 894 INP_WLOCK(inp); 895 rip_dodisconnect(so, inp); 896 INP_WUNLOCK(inp); 897 INP_INFO_WUNLOCK(&V_ripcbinfo); 898 return (0); 899 } 900 901 static int 902 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 903 { 904 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 905 struct inpcb *inp; 906 int error; 907 908 if (nam->sa_len != sizeof(*addr)) 909 return (EINVAL); 910 911 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 912 if (error != 0) 913 return (error); 914 915 inp = sotoinpcb(so); 916 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 917 918 if (TAILQ_EMPTY(&V_ifnet) || 919 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 920 (addr->sin_addr.s_addr && 921 (inp->inp_flags & INP_BINDANY) == 0 && 922 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0)) 923 return (EADDRNOTAVAIL); 924 925 INP_INFO_WLOCK(&V_ripcbinfo); 926 INP_WLOCK(inp); 927 rip_delhash(inp); 928 inp->inp_laddr = addr->sin_addr; 929 rip_inshash(inp); 930 INP_WUNLOCK(inp); 931 INP_INFO_WUNLOCK(&V_ripcbinfo); 932 return (0); 933 } 934 935 static int 936 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 937 { 938 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 939 struct inpcb *inp; 940 941 if (nam->sa_len != sizeof(*addr)) 942 return (EINVAL); 943 if (TAILQ_EMPTY(&V_ifnet)) 944 return (EADDRNOTAVAIL); 945 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 946 return (EAFNOSUPPORT); 947 948 inp = sotoinpcb(so); 949 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 950 951 INP_INFO_WLOCK(&V_ripcbinfo); 952 INP_WLOCK(inp); 953 rip_delhash(inp); 954 inp->inp_faddr = addr->sin_addr; 955 rip_inshash(inp); 956 soisconnected(so); 957 INP_WUNLOCK(inp); 958 INP_INFO_WUNLOCK(&V_ripcbinfo); 959 return (0); 960 } 961 962 static int 963 rip_shutdown(struct socket *so) 964 { 965 struct inpcb *inp; 966 967 inp = sotoinpcb(so); 968 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 969 970 INP_WLOCK(inp); 971 socantsendmore(so); 972 INP_WUNLOCK(inp); 973 return (0); 974 } 975 976 static int 977 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 978 struct mbuf *control, struct thread *td) 979 { 980 struct inpcb *inp; 981 u_long dst; 982 983 inp = sotoinpcb(so); 984 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 985 986 /* 987 * Note: 'dst' reads below are unlocked. 988 */ 989 if (so->so_state & SS_ISCONNECTED) { 990 if (nam) { 991 m_freem(m); 992 return (EISCONN); 993 } 994 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 995 } else { 996 if (nam == NULL) { 997 m_freem(m); 998 return (ENOTCONN); 999 } 1000 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 1001 } 1002 return (rip_output(m, so, dst)); 1003 } 1004 1005 static int 1006 rip_pcblist(SYSCTL_HANDLER_ARGS) 1007 { 1008 int error, i, n; 1009 struct inpcb *inp, **inp_list; 1010 inp_gen_t gencnt; 1011 struct xinpgen xig; 1012 1013 /* 1014 * The process of preparing the TCB list is too time-consuming and 1015 * resource-intensive to repeat twice on every request. 1016 */ 1017 if (req->oldptr == 0) { 1018 n = V_ripcbinfo.ipi_count; 1019 n += imax(n / 8, 10); 1020 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 1021 return (0); 1022 } 1023 1024 if (req->newptr != 0) 1025 return (EPERM); 1026 1027 /* 1028 * OK, now we're committed to doing something. 1029 */ 1030 INP_INFO_RLOCK(&V_ripcbinfo); 1031 gencnt = V_ripcbinfo.ipi_gencnt; 1032 n = V_ripcbinfo.ipi_count; 1033 INP_INFO_RUNLOCK(&V_ripcbinfo); 1034 1035 xig.xig_len = sizeof xig; 1036 xig.xig_count = n; 1037 xig.xig_gen = gencnt; 1038 xig.xig_sogen = so_gencnt; 1039 error = SYSCTL_OUT(req, &xig, sizeof xig); 1040 if (error) 1041 return (error); 1042 1043 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 1044 if (inp_list == 0) 1045 return (ENOMEM); 1046 1047 INP_INFO_RLOCK(&V_ripcbinfo); 1048 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 1049 inp = LIST_NEXT(inp, inp_list)) { 1050 INP_WLOCK(inp); 1051 if (inp->inp_gencnt <= gencnt && 1052 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 1053 in_pcbref(inp); 1054 inp_list[i++] = inp; 1055 } 1056 INP_WUNLOCK(inp); 1057 } 1058 INP_INFO_RUNLOCK(&V_ripcbinfo); 1059 n = i; 1060 1061 error = 0; 1062 for (i = 0; i < n; i++) { 1063 inp = inp_list[i]; 1064 INP_RLOCK(inp); 1065 if (inp->inp_gencnt <= gencnt) { 1066 struct xinpcb xi; 1067 1068 bzero(&xi, sizeof(xi)); 1069 xi.xi_len = sizeof xi; 1070 /* XXX should avoid extra copy */ 1071 bcopy(inp, &xi.xi_inp, sizeof *inp); 1072 if (inp->inp_socket) 1073 sotoxsocket(inp->inp_socket, &xi.xi_socket); 1074 INP_RUNLOCK(inp); 1075 error = SYSCTL_OUT(req, &xi, sizeof xi); 1076 } else 1077 INP_RUNLOCK(inp); 1078 } 1079 INP_INFO_WLOCK(&V_ripcbinfo); 1080 for (i = 0; i < n; i++) { 1081 inp = inp_list[i]; 1082 INP_WLOCK(inp); 1083 if (!in_pcbrele(inp)) 1084 INP_WUNLOCK(inp); 1085 } 1086 INP_INFO_WUNLOCK(&V_ripcbinfo); 1087 1088 if (!error) { 1089 /* 1090 * Give the user an updated idea of our state. If the 1091 * generation differs from what we told her before, she knows 1092 * that something happened while we were processing this 1093 * request, and it might be necessary to retry. 1094 */ 1095 INP_INFO_RLOCK(&V_ripcbinfo); 1096 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 1097 xig.xig_sogen = so_gencnt; 1098 xig.xig_count = V_ripcbinfo.ipi_count; 1099 INP_INFO_RUNLOCK(&V_ripcbinfo); 1100 error = SYSCTL_OUT(req, &xig, sizeof xig); 1101 } 1102 free(inp_list, M_TEMP); 1103 return (error); 1104 } 1105 1106 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, 1107 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 1108 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 1109 1110 struct pr_usrreqs rip_usrreqs = { 1111 .pru_abort = rip_abort, 1112 .pru_attach = rip_attach, 1113 .pru_bind = rip_bind, 1114 .pru_connect = rip_connect, 1115 .pru_control = in_control, 1116 .pru_detach = rip_detach, 1117 .pru_disconnect = rip_disconnect, 1118 .pru_peeraddr = in_getpeeraddr, 1119 .pru_send = rip_send, 1120 .pru_shutdown = rip_shutdown, 1121 .pru_sockaddr = in_getsockaddr, 1122 .pru_sosetlabel = in_pcbsosetlabel, 1123 .pru_close = rip_close, 1124 };
Cache object: c6a2f65c5db6d7e448905334dba6722a
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