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