Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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("$FreeBSD$"); 35 36 #include "opt_inet6.h" 37 #include "opt_ipsec.h" 38 #include "opt_mac.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/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 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_pcb.h> 64 #include <netinet/in_var.h> 65 #include <netinet/ip.h> 66 #include <netinet/ip_var.h> 67 #include <netinet/ip_mroute.h> 68 69 #include <netinet/ip_fw.h> 70 #include <netinet/ip_dummynet.h> 71 72 #ifdef IPSEC 73 #include <netipsec/ipsec.h> 74 #endif /*IPSEC*/ 75 76 #include <security/mac/mac_framework.h> 77 78 struct inpcbhead ripcb; 79 struct inpcbinfo ripcbinfo; 80 81 /* control hooks for ipfw and dummynet */ 82 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 83 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 84 85 /* 86 * Hooks for multicast routing. They all default to NULL, so leave them not 87 * initialized and rely on BSS being set to 0. 88 */ 89 90 /* 91 * The socket used to communicate with the multicast routing daemon. 92 */ 93 struct socket *ip_mrouter; 94 95 /* 96 * The various mrouter and rsvp functions. 97 */ 98 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 99 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 100 int (*ip_mrouter_done)(void); 101 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 102 struct ip_moptions *); 103 int (*mrt_ioctl)(int, caddr_t, int); 104 int (*legal_vif_num)(int); 105 u_long (*ip_mcast_src)(int); 106 107 void (*rsvp_input_p)(struct mbuf *m, int off); 108 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 109 void (*ip_rsvp_force_done)(struct socket *); 110 111 /* 112 * Hash functions 113 */ 114 115 #define INP_PCBHASH_RAW_SIZE 256 116 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 117 (((proto) + (laddr) + (faddr)) % (mask) + 1) 118 119 static void 120 rip_inshash(struct inpcb *inp) 121 { 122 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 123 struct inpcbhead *pcbhash; 124 int hash; 125 126 INP_INFO_WLOCK_ASSERT(pcbinfo); 127 INP_WLOCK_ASSERT(inp); 128 129 if (inp->inp_ip_p != 0 && 130 inp->inp_laddr.s_addr != INADDR_ANY && 131 inp->inp_faddr.s_addr != INADDR_ANY) { 132 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 133 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 134 } else 135 hash = 0; 136 pcbhash = &pcbinfo->ipi_hashbase[hash]; 137 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 138 } 139 140 static void 141 rip_delhash(struct inpcb *inp) 142 { 143 144 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 145 INP_WLOCK_ASSERT(inp); 146 147 LIST_REMOVE(inp, inp_hash); 148 } 149 150 /* 151 * Raw interface to IP protocol. 152 */ 153 154 /* 155 * Initialize raw connection block q. 156 */ 157 static void 158 rip_zone_change(void *tag) 159 { 160 161 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 162 } 163 164 static int 165 rip_inpcb_init(void *mem, int size, int flags) 166 { 167 struct inpcb *inp = mem; 168 169 INP_LOCK_INIT(inp, "inp", "rawinp"); 170 return (0); 171 } 172 173 void 174 rip_init(void) 175 { 176 177 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 178 LIST_INIT(&ripcb); 179 ripcbinfo.ipi_listhead = &ripcb; 180 ripcbinfo.ipi_hashbase = hashinit(INP_PCBHASH_RAW_SIZE, M_PCB, 181 &ripcbinfo.ipi_hashmask); 182 ripcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 183 &ripcbinfo.ipi_porthashmask); 184 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 185 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 186 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 187 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 188 EVENTHANDLER_PRI_ANY); 189 } 190 191 static int 192 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 193 struct sockaddr_in *ripsrc) 194 { 195 int policyfail = 0; 196 197 INP_RLOCK_ASSERT(last); 198 199 #ifdef IPSEC 200 /* check AH/ESP integrity. */ 201 if (ipsec4_in_reject(n, last)) { 202 policyfail = 1; 203 } 204 #endif /* IPSEC */ 205 #ifdef MAC 206 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 207 policyfail = 1; 208 #endif 209 /* Check the minimum TTL for socket. */ 210 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 211 policyfail = 1; 212 if (!policyfail) { 213 struct mbuf *opts = NULL; 214 struct socket *so; 215 216 so = last->inp_socket; 217 if ((last->inp_flags & INP_CONTROLOPTS) || 218 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 219 ip_savecontrol(last, &opts, ip, n); 220 SOCKBUF_LOCK(&so->so_rcv); 221 if (sbappendaddr_locked(&so->so_rcv, 222 (struct sockaddr *)ripsrc, n, opts) == 0) { 223 /* should notify about lost packet */ 224 m_freem(n); 225 if (opts) 226 m_freem(opts); 227 SOCKBUF_UNLOCK(&so->so_rcv); 228 } else 229 sorwakeup_locked(so); 230 } else 231 m_freem(n); 232 return (policyfail); 233 } 234 235 /* 236 * Setup generic address and protocol structures for raw_input routine, then 237 * pass them along with mbuf chain. 238 */ 239 void 240 rip_input(struct mbuf *m, int off) 241 { 242 struct ip *ip = mtod(m, struct ip *); 243 int proto = ip->ip_p; 244 struct inpcb *inp, *last; 245 struct sockaddr_in ripsrc; 246 int hash; 247 248 bzero(&ripsrc, sizeof(ripsrc)); 249 ripsrc.sin_len = sizeof(ripsrc); 250 ripsrc.sin_family = AF_INET; 251 ripsrc.sin_addr = ip->ip_src; 252 last = NULL; 253 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 254 ip->ip_dst.s_addr, ripcbinfo.ipi_hashmask); 255 INP_INFO_RLOCK(&ripcbinfo); 256 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[hash], inp_hash) { 257 if (inp->inp_ip_p != proto) 258 continue; 259 #ifdef INET6 260 /* XXX inp locking */ 261 if ((inp->inp_vflag & INP_IPV4) == 0) 262 continue; 263 #endif 264 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 265 continue; 266 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 267 continue; 268 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 269 continue; 270 if (last) { 271 struct mbuf *n; 272 273 n = m_copy(m, 0, (int)M_COPYALL); 274 if (n != NULL) 275 (void) rip_append(last, ip, n, &ripsrc); 276 /* XXX count dropped packet */ 277 INP_RUNLOCK(last); 278 } 279 INP_RLOCK(inp); 280 last = inp; 281 } 282 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[0], inp_hash) { 283 if (inp->inp_ip_p && inp->inp_ip_p != proto) 284 continue; 285 #ifdef INET6 286 /* XXX inp locking */ 287 if ((inp->inp_vflag & INP_IPV4) == 0) 288 continue; 289 #endif 290 if (inp->inp_laddr.s_addr && 291 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 292 continue; 293 if (inp->inp_faddr.s_addr && 294 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 295 continue; 296 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 297 continue; 298 if (last) { 299 struct mbuf *n; 300 301 n = m_copy(m, 0, (int)M_COPYALL); 302 if (n != NULL) 303 (void) rip_append(last, ip, n, &ripsrc); 304 /* XXX count dropped packet */ 305 INP_RUNLOCK(last); 306 } 307 INP_RLOCK(inp); 308 last = inp; 309 } 310 INP_INFO_RUNLOCK(&ripcbinfo); 311 if (last != NULL) { 312 if (rip_append(last, ip, m, &ripsrc) != 0) 313 ipstat.ips_delivered--; 314 INP_RUNLOCK(last); 315 } else { 316 m_freem(m); 317 ipstat.ips_noproto++; 318 ipstat.ips_delivered--; 319 } 320 } 321 322 /* 323 * Generate IP header and pass packet to ip_output. Tack on options user may 324 * have setup with control call. 325 */ 326 int 327 rip_output(struct mbuf *m, struct socket *so, u_long dst) 328 { 329 struct ip *ip; 330 int error; 331 struct inpcb *inp = sotoinpcb(so); 332 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 333 IP_ALLOWBROADCAST; 334 335 /* 336 * If the user handed us a complete IP packet, use it. Otherwise, 337 * allocate an mbuf for a header and fill it in. 338 */ 339 if ((inp->inp_flags & INP_HDRINCL) == 0) { 340 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 341 m_freem(m); 342 return(EMSGSIZE); 343 } 344 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 345 if (m == NULL) 346 return(ENOBUFS); 347 348 INP_RLOCK(inp); 349 ip = mtod(m, struct ip *); 350 ip->ip_tos = inp->inp_ip_tos; 351 if (inp->inp_flags & INP_DONTFRAG) 352 ip->ip_off = IP_DF; 353 else 354 ip->ip_off = 0; 355 ip->ip_p = inp->inp_ip_p; 356 ip->ip_len = m->m_pkthdr.len; 357 ip->ip_src = inp->inp_laddr; 358 error = prison_get_ip4(inp->inp_cred, &ip->ip_src); 359 if (error != 0) { 360 INP_RUNLOCK(inp); 361 m_freem(m); 362 return (error); 363 } 364 ip->ip_dst.s_addr = dst; 365 ip->ip_ttl = inp->inp_ip_ttl; 366 } else { 367 if (m->m_pkthdr.len > IP_MAXPACKET) { 368 m_freem(m); 369 return(EMSGSIZE); 370 } 371 INP_RLOCK(inp); 372 ip = mtod(m, struct ip *); 373 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 374 if (error != 0) { 375 INP_RUNLOCK(inp); 376 m_freem(m); 377 return (error); 378 } 379 380 /* 381 * Don't allow both user specified and setsockopt options, 382 * and don't allow packet length sizes that will crash. 383 */ 384 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 385 || (ip->ip_len > m->m_pkthdr.len) 386 || (ip->ip_len < (ip->ip_hl << 2))) { 387 INP_RUNLOCK(inp); 388 m_freem(m); 389 return (EINVAL); 390 } 391 if (ip->ip_id == 0) 392 ip->ip_id = ip_newid(); 393 394 /* 395 * XXX prevent ip_output from overwriting header fields. 396 */ 397 flags |= IP_RAWOUTPUT; 398 ipstat.ips_rawout++; 399 } 400 401 if (inp->inp_flags & INP_ONESBCAST) 402 flags |= IP_SENDONES; 403 404 #ifdef MAC 405 mac_create_mbuf_from_inpcb(inp, m); 406 #endif 407 408 error = ip_output(m, inp->inp_options, NULL, flags, 409 inp->inp_moptions, inp); 410 INP_RUNLOCK(inp); 411 return (error); 412 } 413 414 /* 415 * Raw IP socket option processing. 416 * 417 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 418 * only be created by a privileged process, and as such, socket option 419 * operations to manage system properties on any raw socket were allowed to 420 * take place without explicit additional access control checks. However, 421 * raw sockets can now also be created in jail(), and therefore explicit 422 * checks are now required. Likewise, raw sockets can be used by a process 423 * after it gives up privilege, so some caution is required. For options 424 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 425 * performed in ip_ctloutput() and therefore no check occurs here. 426 * Unilaterally checking priv_check() here breaks normal IP socket option 427 * operations on raw sockets. 428 * 429 * When adding new socket options here, make sure to add access control 430 * checks here as necessary. 431 */ 432 int 433 rip_ctloutput(struct socket *so, struct sockopt *sopt) 434 { 435 struct inpcb *inp = sotoinpcb(so); 436 int error, optval; 437 438 if (sopt->sopt_level != IPPROTO_IP) { 439 if ((sopt->sopt_level == SOL_SOCKET) && 440 (sopt->sopt_name == SO_SETFIB)) { 441 inp->inp_inc.inc_fibnum = so->so_fibnum; 442 return (0); 443 } 444 return (EINVAL); 445 } 446 447 error = 0; 448 switch (sopt->sopt_dir) { 449 case SOPT_GET: 450 switch (sopt->sopt_name) { 451 case IP_HDRINCL: 452 optval = inp->inp_flags & INP_HDRINCL; 453 error = sooptcopyout(sopt, &optval, sizeof optval); 454 break; 455 456 case IP_FW_ADD: /* ADD actually returns the body... */ 457 case IP_FW_GET: 458 case IP_FW_TABLE_GETSIZE: 459 case IP_FW_TABLE_LIST: 460 case IP_FW_NAT_GET_CONFIG: 461 case IP_FW_NAT_GET_LOG: 462 if (ip_fw_ctl_ptr != NULL) 463 error = ip_fw_ctl_ptr(sopt); 464 else 465 error = ENOPROTOOPT; 466 break; 467 468 case IP_DUMMYNET_GET: 469 if (ip_dn_ctl_ptr != NULL) 470 error = ip_dn_ctl_ptr(sopt); 471 else 472 error = ENOPROTOOPT; 473 break ; 474 475 case MRT_INIT: 476 case MRT_DONE: 477 case MRT_ADD_VIF: 478 case MRT_DEL_VIF: 479 case MRT_ADD_MFC: 480 case MRT_DEL_MFC: 481 case MRT_VERSION: 482 case MRT_ASSERT: 483 case MRT_API_SUPPORT: 484 case MRT_API_CONFIG: 485 case MRT_ADD_BW_UPCALL: 486 case MRT_DEL_BW_UPCALL: 487 error = priv_check(curthread, PRIV_NETINET_MROUTE); 488 if (error != 0) 489 return (error); 490 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 491 EOPNOTSUPP; 492 break; 493 494 default: 495 error = ip_ctloutput(so, sopt); 496 break; 497 } 498 break; 499 500 case SOPT_SET: 501 switch (sopt->sopt_name) { 502 case IP_HDRINCL: 503 error = sooptcopyin(sopt, &optval, sizeof optval, 504 sizeof optval); 505 if (error) 506 break; 507 if (optval) 508 inp->inp_flags |= INP_HDRINCL; 509 else 510 inp->inp_flags &= ~INP_HDRINCL; 511 break; 512 513 case IP_FW_ADD: 514 case IP_FW_DEL: 515 case IP_FW_FLUSH: 516 case IP_FW_ZERO: 517 case IP_FW_RESETLOG: 518 case IP_FW_TABLE_ADD: 519 case IP_FW_TABLE_DEL: 520 case IP_FW_TABLE_FLUSH: 521 case IP_FW_NAT_CFG: 522 case IP_FW_NAT_DEL: 523 if (ip_fw_ctl_ptr != NULL) 524 error = ip_fw_ctl_ptr(sopt); 525 else 526 error = ENOPROTOOPT; 527 break; 528 529 case IP_DUMMYNET_CONFIGURE: 530 case IP_DUMMYNET_DEL: 531 case IP_DUMMYNET_FLUSH: 532 if (ip_dn_ctl_ptr != NULL) 533 error = ip_dn_ctl_ptr(sopt); 534 else 535 error = ENOPROTOOPT ; 536 break ; 537 538 case IP_RSVP_ON: 539 error = priv_check(curthread, PRIV_NETINET_MROUTE); 540 if (error != 0) 541 return (error); 542 error = ip_rsvp_init(so); 543 break; 544 545 case IP_RSVP_OFF: 546 error = priv_check(curthread, PRIV_NETINET_MROUTE); 547 if (error != 0) 548 return (error); 549 error = ip_rsvp_done(); 550 break; 551 552 case IP_RSVP_VIF_ON: 553 case IP_RSVP_VIF_OFF: 554 error = priv_check(curthread, PRIV_NETINET_MROUTE); 555 if (error != 0) 556 return (error); 557 error = ip_rsvp_vif ? 558 ip_rsvp_vif(so, sopt) : EINVAL; 559 break; 560 561 case MRT_INIT: 562 case MRT_DONE: 563 case MRT_ADD_VIF: 564 case MRT_DEL_VIF: 565 case MRT_ADD_MFC: 566 case MRT_DEL_MFC: 567 case MRT_VERSION: 568 case MRT_ASSERT: 569 case MRT_API_SUPPORT: 570 case MRT_API_CONFIG: 571 case MRT_ADD_BW_UPCALL: 572 case MRT_DEL_BW_UPCALL: 573 error = priv_check(curthread, PRIV_NETINET_MROUTE); 574 if (error != 0) 575 return (error); 576 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 577 EOPNOTSUPP; 578 break; 579 580 default: 581 error = ip_ctloutput(so, sopt); 582 break; 583 } 584 break; 585 } 586 587 return (error); 588 } 589 590 /* 591 * This function exists solely to receive the PRC_IFDOWN messages which are 592 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 593 * in_ifadown() to remove all routes corresponding to that address. It also 594 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 595 * routes. 596 */ 597 void 598 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 599 { 600 struct in_ifaddr *ia; 601 struct ifnet *ifp; 602 int err; 603 int flags; 604 605 switch (cmd) { 606 case PRC_IFDOWN: 607 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 608 if (ia->ia_ifa.ifa_addr == sa 609 && (ia->ia_flags & IFA_ROUTE)) { 610 /* 611 * in_ifscrub kills the interface route. 612 */ 613 in_ifscrub(ia->ia_ifp, ia); 614 /* 615 * in_ifadown gets rid of all the rest of the 616 * routes. This is not quite the right thing 617 * to do, but at least if we are running a 618 * routing process they will come back. 619 */ 620 in_ifadown(&ia->ia_ifa, 0); 621 break; 622 } 623 } 624 break; 625 626 case PRC_IFUP: 627 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 628 if (ia->ia_ifa.ifa_addr == sa) 629 break; 630 } 631 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 632 return; 633 flags = RTF_UP; 634 ifp = ia->ia_ifa.ifa_ifp; 635 636 if ((ifp->if_flags & IFF_LOOPBACK) 637 || (ifp->if_flags & IFF_POINTOPOINT)) 638 flags |= RTF_HOST; 639 640 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 641 if (err == 0) 642 ia->ia_flags |= IFA_ROUTE; 643 break; 644 } 645 } 646 647 u_long rip_sendspace = 9216; 648 u_long rip_recvspace = 9216; 649 650 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 651 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 652 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 653 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 654 655 static int 656 rip_attach(struct socket *so, int proto, struct thread *td) 657 { 658 struct inpcb *inp; 659 int error; 660 661 inp = sotoinpcb(so); 662 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 663 664 error = priv_check(td, PRIV_NETINET_RAW); 665 if (error) 666 return (error); 667 if (proto >= IPPROTO_MAX || proto < 0) 668 return EPROTONOSUPPORT; 669 error = soreserve(so, rip_sendspace, rip_recvspace); 670 if (error) 671 return (error); 672 INP_INFO_WLOCK(&ripcbinfo); 673 error = in_pcballoc(so, &ripcbinfo); 674 if (error) { 675 INP_INFO_WUNLOCK(&ripcbinfo); 676 return (error); 677 } 678 inp = (struct inpcb *)so->so_pcb; 679 inp->inp_vflag |= INP_IPV4; 680 inp->inp_ip_p = proto; 681 inp->inp_ip_ttl = ip_defttl; 682 rip_inshash(inp); 683 INP_INFO_WUNLOCK(&ripcbinfo); 684 INP_WUNLOCK(inp); 685 return (0); 686 } 687 688 static void 689 rip_detach(struct socket *so) 690 { 691 struct inpcb *inp; 692 693 inp = sotoinpcb(so); 694 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 695 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 696 ("rip_detach: not closed")); 697 698 INP_INFO_WLOCK(&ripcbinfo); 699 INP_WLOCK(inp); 700 rip_delhash(inp); 701 if (so == ip_mrouter && ip_mrouter_done) 702 ip_mrouter_done(); 703 if (ip_rsvp_force_done) 704 ip_rsvp_force_done(so); 705 if (so == ip_rsvpd) 706 ip_rsvp_done(); 707 in_pcbdetach(inp); 708 in_pcbfree(inp); 709 INP_INFO_WUNLOCK(&ripcbinfo); 710 } 711 712 static void 713 rip_dodisconnect(struct socket *so, struct inpcb *inp) 714 { 715 716 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 717 INP_WLOCK_ASSERT(inp); 718 719 rip_delhash(inp); 720 inp->inp_faddr.s_addr = INADDR_ANY; 721 rip_inshash(inp); 722 SOCK_LOCK(so); 723 so->so_state &= ~SS_ISCONNECTED; 724 SOCK_UNLOCK(so); 725 } 726 727 static void 728 rip_abort(struct socket *so) 729 { 730 struct inpcb *inp; 731 732 inp = sotoinpcb(so); 733 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 734 735 INP_INFO_WLOCK(&ripcbinfo); 736 INP_WLOCK(inp); 737 rip_dodisconnect(so, inp); 738 INP_WUNLOCK(inp); 739 INP_INFO_WUNLOCK(&ripcbinfo); 740 } 741 742 static void 743 rip_close(struct socket *so) 744 { 745 struct inpcb *inp; 746 747 inp = sotoinpcb(so); 748 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 749 750 INP_INFO_WLOCK(&ripcbinfo); 751 INP_WLOCK(inp); 752 rip_dodisconnect(so, inp); 753 INP_WUNLOCK(inp); 754 INP_INFO_WUNLOCK(&ripcbinfo); 755 } 756 757 static int 758 rip_disconnect(struct socket *so) 759 { 760 struct inpcb *inp; 761 762 if ((so->so_state & SS_ISCONNECTED) == 0) 763 return (ENOTCONN); 764 765 inp = sotoinpcb(so); 766 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 767 768 INP_INFO_WLOCK(&ripcbinfo); 769 INP_WLOCK(inp); 770 rip_dodisconnect(so, inp); 771 INP_WUNLOCK(inp); 772 INP_INFO_WUNLOCK(&ripcbinfo); 773 return (0); 774 } 775 776 static int 777 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 778 { 779 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 780 struct inpcb *inp; 781 int error; 782 783 if (nam->sa_len != sizeof(*addr)) 784 return (EINVAL); 785 786 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 787 if (error != 0) 788 return (error); 789 790 if (TAILQ_EMPTY(&ifnet) || 791 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 792 (addr->sin_addr.s_addr && 793 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 794 return (EADDRNOTAVAIL); 795 796 inp = sotoinpcb(so); 797 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 798 799 INP_INFO_WLOCK(&ripcbinfo); 800 INP_WLOCK(inp); 801 rip_delhash(inp); 802 inp->inp_laddr = addr->sin_addr; 803 rip_inshash(inp); 804 INP_WUNLOCK(inp); 805 INP_INFO_WUNLOCK(&ripcbinfo); 806 return (0); 807 } 808 809 static int 810 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 811 { 812 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 813 struct inpcb *inp; 814 815 if (nam->sa_len != sizeof(*addr)) 816 return (EINVAL); 817 if (TAILQ_EMPTY(&ifnet)) 818 return (EADDRNOTAVAIL); 819 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 820 return (EAFNOSUPPORT); 821 822 inp = sotoinpcb(so); 823 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 824 825 INP_INFO_WLOCK(&ripcbinfo); 826 INP_WLOCK(inp); 827 rip_delhash(inp); 828 inp->inp_faddr = addr->sin_addr; 829 rip_inshash(inp); 830 soisconnected(so); 831 INP_WUNLOCK(inp); 832 INP_INFO_WUNLOCK(&ripcbinfo); 833 return (0); 834 } 835 836 static int 837 rip_shutdown(struct socket *so) 838 { 839 struct inpcb *inp; 840 841 inp = sotoinpcb(so); 842 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 843 844 INP_WLOCK(inp); 845 socantsendmore(so); 846 INP_WUNLOCK(inp); 847 return (0); 848 } 849 850 static int 851 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 852 struct mbuf *control, struct thread *td) 853 { 854 struct inpcb *inp; 855 u_long dst; 856 857 inp = sotoinpcb(so); 858 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 859 860 /* 861 * Note: 'dst' reads below are unlocked. 862 */ 863 if (so->so_state & SS_ISCONNECTED) { 864 if (nam) { 865 m_freem(m); 866 return (EISCONN); 867 } 868 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 869 } else { 870 if (nam == NULL) { 871 m_freem(m); 872 return (ENOTCONN); 873 } 874 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 875 } 876 return (rip_output(m, so, dst)); 877 } 878 879 static int 880 rip_pcblist(SYSCTL_HANDLER_ARGS) 881 { 882 int error, i, n; 883 struct inpcb *inp, **inp_list; 884 inp_gen_t gencnt; 885 struct xinpgen xig; 886 887 /* 888 * The process of preparing the TCB list is too time-consuming and 889 * resource-intensive to repeat twice on every request. 890 */ 891 if (req->oldptr == 0) { 892 n = ripcbinfo.ipi_count; 893 req->oldidx = 2 * (sizeof xig) 894 + (n + n/8) * sizeof(struct xinpcb); 895 return (0); 896 } 897 898 if (req->newptr != 0) 899 return (EPERM); 900 901 /* 902 * OK, now we're committed to doing something. 903 */ 904 INP_INFO_RLOCK(&ripcbinfo); 905 gencnt = ripcbinfo.ipi_gencnt; 906 n = ripcbinfo.ipi_count; 907 INP_INFO_RUNLOCK(&ripcbinfo); 908 909 xig.xig_len = sizeof xig; 910 xig.xig_count = n; 911 xig.xig_gen = gencnt; 912 xig.xig_sogen = so_gencnt; 913 error = SYSCTL_OUT(req, &xig, sizeof xig); 914 if (error) 915 return (error); 916 917 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 918 if (inp_list == 0) 919 return (ENOMEM); 920 921 INP_INFO_RLOCK(&ripcbinfo); 922 for (inp = LIST_FIRST(ripcbinfo.ipi_listhead), i = 0; inp && i < n; 923 inp = LIST_NEXT(inp, inp_list)) { 924 INP_RLOCK(inp); 925 if (inp->inp_gencnt <= gencnt && 926 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 927 /* XXX held references? */ 928 inp_list[i++] = inp; 929 } 930 INP_RUNLOCK(inp); 931 } 932 INP_INFO_RUNLOCK(&ripcbinfo); 933 n = i; 934 935 error = 0; 936 for (i = 0; i < n; i++) { 937 inp = inp_list[i]; 938 INP_RLOCK(inp); 939 if (inp->inp_gencnt <= gencnt) { 940 struct xinpcb xi; 941 bzero(&xi, sizeof(xi)); 942 xi.xi_len = sizeof xi; 943 /* XXX should avoid extra copy */ 944 bcopy(inp, &xi.xi_inp, sizeof *inp); 945 if (inp->inp_socket) 946 sotoxsocket(inp->inp_socket, &xi.xi_socket); 947 INP_RUNLOCK(inp); 948 error = SYSCTL_OUT(req, &xi, sizeof xi); 949 } else 950 INP_RUNLOCK(inp); 951 } 952 if (!error) { 953 /* 954 * Give the user an updated idea of our state. If the 955 * generation differs from what we told her before, she knows 956 * that something happened while we were processing this 957 * request, and it might be necessary to retry. 958 */ 959 INP_INFO_RLOCK(&ripcbinfo); 960 xig.xig_gen = ripcbinfo.ipi_gencnt; 961 xig.xig_sogen = so_gencnt; 962 xig.xig_count = ripcbinfo.ipi_count; 963 INP_INFO_RUNLOCK(&ripcbinfo); 964 error = SYSCTL_OUT(req, &xig, sizeof xig); 965 } 966 free(inp_list, M_TEMP); 967 return (error); 968 } 969 970 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 971 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 972 973 struct pr_usrreqs rip_usrreqs = { 974 .pru_abort = rip_abort, 975 .pru_attach = rip_attach, 976 .pru_bind = rip_bind, 977 .pru_connect = rip_connect, 978 .pru_control = in_control, 979 .pru_detach = rip_detach, 980 .pru_disconnect = rip_disconnect, 981 .pru_peeraddr = in_getpeeraddr, 982 .pru_send = rip_send, 983 .pru_shutdown = rip_shutdown, 984 .pru_sockaddr = in_getsockaddr, 985 .pru_sosetlabel = in_pcbsosetlabel, 986 .pru_close = rip_close, 987 };
Cache object: fffb3223781108c8b2647bfb1bef3950
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