1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_inet6.h" 34 #include "opt_ipsec.h" 35 #include "opt_mac.h" 36 37 #include <sys/param.h> 38 #include <sys/jail.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/mac.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/proc.h> 45 #include <sys/protosw.h> 46 #include <sys/signalvar.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/sx.h> 50 #include <sys/sysctl.h> 51 #include <sys/systm.h> 52 53 #include <vm/uma.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/in_var.h> 62 #include <netinet/ip.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/ip_mroute.h> 65 66 #include <netinet/ip_fw.h> 67 #include <netinet/ip_dummynet.h> 68 69 #ifdef FAST_IPSEC 70 #include <netipsec/ipsec.h> 71 #endif /*FAST_IPSEC*/ 72 73 #ifdef IPSEC 74 #include <netinet6/ipsec.h> 75 #endif /*IPSEC*/ 76 77 struct inpcbhead ripcb; 78 struct inpcbinfo ripcbinfo; 79 80 /* control hooks for ipfw and dummynet */ 81 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 82 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 83 84 /* 85 * hooks for multicast routing. They all default to NULL, 86 * so leave them not initialized and rely on BSS being set to 0. 87 */ 88 89 /* The socket used to communicate with the multicast routing daemon. */ 90 struct socket *ip_mrouter; 91 92 /* The various mrouter and rsvp functions */ 93 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 94 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 95 int (*ip_mrouter_done)(void); 96 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 97 struct ip_moptions *); 98 int (*mrt_ioctl)(int, caddr_t); 99 int (*legal_vif_num)(int); 100 u_long (*ip_mcast_src)(int); 101 102 void (*rsvp_input_p)(struct mbuf *m, int off); 103 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 104 void (*ip_rsvp_force_done)(struct socket *); 105 106 /* 107 * Nominal space allocated to a raw ip socket. 108 */ 109 #define RIPSNDQ 8192 110 #define RIPRCVQ 8192 111 112 /* 113 * Raw interface to IP protocol. 114 */ 115 116 /* 117 * Initialize raw connection block q. 118 */ 119 static void 120 rip_zone_change(void *tag) 121 { 122 123 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 124 } 125 126 void 127 rip_init() 128 { 129 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 130 LIST_INIT(&ripcb); 131 ripcbinfo.listhead = &ripcb; 132 /* 133 * XXX We don't use the hash list for raw IP, but it's easier 134 * to allocate a one entry hash list than it is to check all 135 * over the place for hashbase == NULL. 136 */ 137 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 138 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask); 139 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 140 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 141 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 142 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, 143 NULL, EVENTHANDLER_PRI_ANY); 144 } 145 146 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 147 148 static int 149 raw_append(struct inpcb *last, struct ip *ip, struct mbuf *n) 150 { 151 int policyfail = 0; 152 153 INP_LOCK_ASSERT(last); 154 155 #if defined(IPSEC) || defined(FAST_IPSEC) 156 /* check AH/ESP integrity. */ 157 if (ipsec4_in_reject(n, last)) { 158 policyfail = 1; 159 #ifdef IPSEC 160 ipsecstat.in_polvio++; 161 #endif /*IPSEC*/ 162 /* do not inject data to pcb */ 163 } 164 #endif /*IPSEC || FAST_IPSEC*/ 165 #ifdef MAC 166 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 167 policyfail = 1; 168 #endif 169 /* Check the minimum TTL for socket. */ 170 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 171 policyfail = 1; 172 if (!policyfail) { 173 struct mbuf *opts = NULL; 174 struct socket *so; 175 176 so = last->inp_socket; 177 if ((last->inp_flags & INP_CONTROLOPTS) || 178 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 179 ip_savecontrol(last, &opts, ip, n); 180 SOCKBUF_LOCK(&so->so_rcv); 181 if (sbappendaddr_locked(&so->so_rcv, 182 (struct sockaddr *)&ripsrc, n, opts) == 0) { 183 /* should notify about lost packet */ 184 m_freem(n); 185 if (opts) 186 m_freem(opts); 187 SOCKBUF_UNLOCK(&so->so_rcv); 188 } else 189 sorwakeup_locked(so); 190 } else 191 m_freem(n); 192 return policyfail; 193 } 194 195 /* 196 * Setup generic address and protocol structures 197 * for raw_input routine, then pass them along with 198 * mbuf chain. 199 */ 200 void 201 rip_input(struct mbuf *m, int off) 202 { 203 struct ip *ip = mtod(m, struct ip *); 204 int proto = ip->ip_p; 205 struct inpcb *inp, *last; 206 207 INP_INFO_RLOCK(&ripcbinfo); 208 ripsrc.sin_addr = ip->ip_src; 209 last = NULL; 210 LIST_FOREACH(inp, &ripcb, inp_list) { 211 INP_LOCK(inp); 212 if (inp->inp_ip_p && inp->inp_ip_p != proto) { 213 docontinue: 214 INP_UNLOCK(inp); 215 continue; 216 } 217 #ifdef INET6 218 if ((inp->inp_vflag & INP_IPV4) == 0) 219 goto docontinue; 220 #endif 221 if (inp->inp_laddr.s_addr && 222 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 223 goto docontinue; 224 if (inp->inp_faddr.s_addr && 225 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 226 goto docontinue; 227 if (jailed(inp->inp_socket->so_cred)) 228 if (htonl(prison_getip(inp->inp_socket->so_cred)) != 229 ip->ip_dst.s_addr) 230 goto docontinue; 231 if (last) { 232 struct mbuf *n; 233 234 n = m_copy(m, 0, (int)M_COPYALL); 235 if (n != NULL) 236 (void) raw_append(last, ip, n); 237 /* XXX count dropped packet */ 238 INP_UNLOCK(last); 239 } 240 last = inp; 241 } 242 if (last != NULL) { 243 if (raw_append(last, ip, m) != 0) 244 ipstat.ips_delivered--; 245 INP_UNLOCK(last); 246 } else { 247 m_freem(m); 248 ipstat.ips_noproto++; 249 ipstat.ips_delivered--; 250 } 251 INP_INFO_RUNLOCK(&ripcbinfo); 252 } 253 254 /* 255 * Generate IP header and pass packet to ip_output. 256 * Tack on options user may have setup with control call. 257 */ 258 int 259 rip_output(struct mbuf *m, struct socket *so, u_long dst) 260 { 261 struct ip *ip; 262 int error; 263 struct inpcb *inp = sotoinpcb(so); 264 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 265 IP_ALLOWBROADCAST; 266 267 /* 268 * If the user handed us a complete IP packet, use it. 269 * Otherwise, allocate an mbuf for a header and fill it in. 270 */ 271 if ((inp->inp_flags & INP_HDRINCL) == 0) { 272 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 273 m_freem(m); 274 return(EMSGSIZE); 275 } 276 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 277 if (m == NULL) 278 return(ENOBUFS); 279 280 INP_LOCK(inp); 281 ip = mtod(m, struct ip *); 282 ip->ip_tos = inp->inp_ip_tos; 283 if (inp->inp_flags & INP_DONTFRAG) 284 ip->ip_off = IP_DF; 285 else 286 ip->ip_off = 0; 287 ip->ip_p = inp->inp_ip_p; 288 ip->ip_len = m->m_pkthdr.len; 289 if (jailed(inp->inp_socket->so_cred)) 290 ip->ip_src.s_addr = 291 htonl(prison_getip(inp->inp_socket->so_cred)); 292 else 293 ip->ip_src = inp->inp_laddr; 294 ip->ip_dst.s_addr = dst; 295 ip->ip_ttl = inp->inp_ip_ttl; 296 } else { 297 if (m->m_pkthdr.len > IP_MAXPACKET) { 298 m_freem(m); 299 return(EMSGSIZE); 300 } 301 INP_LOCK(inp); 302 ip = mtod(m, struct ip *); 303 if (jailed(inp->inp_socket->so_cred)) { 304 if (ip->ip_src.s_addr != 305 htonl(prison_getip(inp->inp_socket->so_cred))) { 306 INP_UNLOCK(inp); 307 m_freem(m); 308 return (EPERM); 309 } 310 } 311 /* don't allow both user specified and setsockopt options, 312 and don't allow packet length sizes that will crash */ 313 if (((ip->ip_hl != (sizeof (*ip) >> 2)) 314 && inp->inp_options) 315 || (ip->ip_len > m->m_pkthdr.len) 316 || (ip->ip_len < (ip->ip_hl << 2))) { 317 INP_UNLOCK(inp); 318 m_freem(m); 319 return EINVAL; 320 } 321 if (ip->ip_id == 0) 322 ip->ip_id = ip_newid(); 323 /* XXX prevent ip_output from overwriting header fields */ 324 flags |= IP_RAWOUTPUT; 325 ipstat.ips_rawout++; 326 } 327 328 if (inp->inp_vflag & INP_ONESBCAST) 329 flags |= IP_SENDONES; 330 331 #ifdef MAC 332 mac_create_mbuf_from_inpcb(inp, m); 333 #endif 334 335 error = ip_output(m, inp->inp_options, NULL, flags, 336 inp->inp_moptions, inp); 337 INP_UNLOCK(inp); 338 return error; 339 } 340 341 /* 342 * Raw IP socket option processing. 343 * 344 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 345 * only be created by a privileged process, and as such, socket option 346 * operations to manage system properties on any raw socket were allowed to 347 * take place without explicit additional access control checks. However, 348 * raw sockets can now also be created in jail(), and therefore explicit 349 * checks are now required. Likewise, raw sockets can be used by a process 350 * after it gives up privilege, so some caution is required. For options 351 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 352 * performed in ip_ctloutput() and therefore no check occurs here. 353 * Unilaterally checking suser() here breaks normal IP socket option 354 * operations on raw sockets. 355 * 356 * When adding new socket options here, make sure to add access control 357 * checks here as necessary. 358 */ 359 int 360 rip_ctloutput(struct socket *so, struct sockopt *sopt) 361 { 362 struct inpcb *inp = sotoinpcb(so); 363 int error, optval; 364 365 if (sopt->sopt_level != IPPROTO_IP) 366 return (EINVAL); 367 368 error = 0; 369 switch (sopt->sopt_dir) { 370 case SOPT_GET: 371 switch (sopt->sopt_name) { 372 case IP_HDRINCL: 373 optval = inp->inp_flags & INP_HDRINCL; 374 error = sooptcopyout(sopt, &optval, sizeof optval); 375 break; 376 377 case IP_FW_ADD: /* ADD actually returns the body... */ 378 case IP_FW_GET: 379 case IP_FW_TABLE_GETSIZE: 380 case IP_FW_TABLE_LIST: 381 error = suser(curthread); 382 if (error != 0) 383 return (error); 384 if (ip_fw_ctl_ptr != NULL) 385 error = ip_fw_ctl_ptr(sopt); 386 else 387 error = ENOPROTOOPT; 388 break; 389 390 case IP_DUMMYNET_GET: 391 error = suser(curthread); 392 if (error != 0) 393 return (error); 394 if (ip_dn_ctl_ptr != NULL) 395 error = ip_dn_ctl_ptr(sopt); 396 else 397 error = ENOPROTOOPT; 398 break ; 399 400 case MRT_INIT: 401 case MRT_DONE: 402 case MRT_ADD_VIF: 403 case MRT_DEL_VIF: 404 case MRT_ADD_MFC: 405 case MRT_DEL_MFC: 406 case MRT_VERSION: 407 case MRT_ASSERT: 408 case MRT_API_SUPPORT: 409 case MRT_API_CONFIG: 410 case MRT_ADD_BW_UPCALL: 411 case MRT_DEL_BW_UPCALL: 412 error = suser(curthread); 413 if (error != 0) 414 return (error); 415 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 416 EOPNOTSUPP; 417 break; 418 419 default: 420 error = ip_ctloutput(so, sopt); 421 break; 422 } 423 break; 424 425 case SOPT_SET: 426 switch (sopt->sopt_name) { 427 case IP_HDRINCL: 428 error = sooptcopyin(sopt, &optval, sizeof optval, 429 sizeof optval); 430 if (error) 431 break; 432 if (optval) 433 inp->inp_flags |= INP_HDRINCL; 434 else 435 inp->inp_flags &= ~INP_HDRINCL; 436 break; 437 438 case IP_FW_ADD: 439 case IP_FW_DEL: 440 case IP_FW_FLUSH: 441 case IP_FW_ZERO: 442 case IP_FW_RESETLOG: 443 case IP_FW_TABLE_ADD: 444 case IP_FW_TABLE_DEL: 445 case IP_FW_TABLE_FLUSH: 446 error = suser(curthread); 447 if (error != 0) 448 return (error); 449 if (ip_fw_ctl_ptr != NULL) 450 error = ip_fw_ctl_ptr(sopt); 451 else 452 error = ENOPROTOOPT; 453 break; 454 455 case IP_DUMMYNET_CONFIGURE: 456 case IP_DUMMYNET_DEL: 457 case IP_DUMMYNET_FLUSH: 458 error = suser(curthread); 459 if (error != 0) 460 return (error); 461 if (ip_dn_ctl_ptr != NULL) 462 error = ip_dn_ctl_ptr(sopt); 463 else 464 error = ENOPROTOOPT ; 465 break ; 466 467 case IP_RSVP_ON: 468 error = suser(curthread); 469 if (error != 0) 470 return (error); 471 error = ip_rsvp_init(so); 472 break; 473 474 case IP_RSVP_OFF: 475 error = suser(curthread); 476 if (error != 0) 477 return (error); 478 error = ip_rsvp_done(); 479 break; 480 481 case IP_RSVP_VIF_ON: 482 case IP_RSVP_VIF_OFF: 483 error = suser(curthread); 484 if (error != 0) 485 return (error); 486 error = ip_rsvp_vif ? 487 ip_rsvp_vif(so, sopt) : EINVAL; 488 break; 489 490 case MRT_INIT: 491 case MRT_DONE: 492 case MRT_ADD_VIF: 493 case MRT_DEL_VIF: 494 case MRT_ADD_MFC: 495 case MRT_DEL_MFC: 496 case MRT_VERSION: 497 case MRT_ASSERT: 498 case MRT_API_SUPPORT: 499 case MRT_API_CONFIG: 500 case MRT_ADD_BW_UPCALL: 501 case MRT_DEL_BW_UPCALL: 502 error = suser(curthread); 503 if (error != 0) 504 return (error); 505 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 506 EOPNOTSUPP; 507 break; 508 509 default: 510 error = ip_ctloutput(so, sopt); 511 break; 512 } 513 break; 514 } 515 516 return (error); 517 } 518 519 /* 520 * This function exists solely to receive the PRC_IFDOWN messages which 521 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 522 * and calls in_ifadown() to remove all routes corresponding to that address. 523 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 524 * interface routes. 525 */ 526 void 527 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 528 { 529 struct in_ifaddr *ia; 530 struct ifnet *ifp; 531 int err; 532 int flags; 533 534 switch (cmd) { 535 case PRC_IFDOWN: 536 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 537 if (ia->ia_ifa.ifa_addr == sa 538 && (ia->ia_flags & IFA_ROUTE)) { 539 /* 540 * in_ifscrub kills the interface route. 541 */ 542 in_ifscrub(ia->ia_ifp, ia); 543 /* 544 * in_ifadown gets rid of all the rest of 545 * the routes. This is not quite the right 546 * thing to do, but at least if we are running 547 * a routing process they will come back. 548 */ 549 in_ifadown(&ia->ia_ifa, 0); 550 break; 551 } 552 } 553 break; 554 555 case PRC_IFUP: 556 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 557 if (ia->ia_ifa.ifa_addr == sa) 558 break; 559 } 560 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 561 return; 562 flags = RTF_UP; 563 ifp = ia->ia_ifa.ifa_ifp; 564 565 if ((ifp->if_flags & IFF_LOOPBACK) 566 || (ifp->if_flags & IFF_POINTOPOINT)) 567 flags |= RTF_HOST; 568 569 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 570 if (err == 0) 571 ia->ia_flags |= IFA_ROUTE; 572 break; 573 } 574 } 575 576 u_long rip_sendspace = RIPSNDQ; 577 u_long rip_recvspace = RIPRCVQ; 578 579 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 580 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 581 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 582 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 583 584 static int 585 rip_attach(struct socket *so, int proto, struct thread *td) 586 { 587 struct inpcb *inp; 588 int error; 589 590 inp = sotoinpcb(so); 591 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 592 if (jailed(td->td_ucred) && !jail_allow_raw_sockets) 593 return (EPERM); 594 if ((error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL)) != 0) 595 return error; 596 if (proto >= IPPROTO_MAX || proto < 0) 597 return EPROTONOSUPPORT; 598 error = soreserve(so, rip_sendspace, rip_recvspace); 599 if (error) 600 return error; 601 INP_INFO_WLOCK(&ripcbinfo); 602 error = in_pcballoc(so, &ripcbinfo, "rawinp"); 603 if (error) { 604 INP_INFO_WUNLOCK(&ripcbinfo); 605 return error; 606 } 607 inp = (struct inpcb *)so->so_pcb; 608 INP_LOCK(inp); 609 INP_INFO_WUNLOCK(&ripcbinfo); 610 inp->inp_vflag |= INP_IPV4; 611 inp->inp_ip_p = proto; 612 inp->inp_ip_ttl = ip_defttl; 613 INP_UNLOCK(inp); 614 return 0; 615 } 616 617 static void 618 rip_pcbdetach(struct socket *so, struct inpcb *inp) 619 { 620 621 INP_INFO_WLOCK_ASSERT(&ripcbinfo); 622 INP_LOCK_ASSERT(inp); 623 624 if (so == ip_mrouter && ip_mrouter_done) 625 ip_mrouter_done(); 626 if (ip_rsvp_force_done) 627 ip_rsvp_force_done(so); 628 if (so == ip_rsvpd) 629 ip_rsvp_done(); 630 in_pcbdetach(inp); 631 in_pcbfree(inp); 632 } 633 634 static void 635 rip_detach(struct socket *so) 636 { 637 struct inpcb *inp; 638 639 inp = sotoinpcb(so); 640 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 641 INP_INFO_WLOCK(&ripcbinfo); 642 INP_LOCK(inp); 643 rip_pcbdetach(so, inp); 644 INP_INFO_WUNLOCK(&ripcbinfo); 645 } 646 647 static void 648 rip_abort(struct socket *so) 649 { 650 struct inpcb *inp; 651 652 inp = sotoinpcb(so); 653 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 654 INP_INFO_WLOCK(&ripcbinfo); 655 INP_LOCK(inp); 656 soisdisconnected(so); 657 rip_pcbdetach(so, inp); 658 INP_INFO_WUNLOCK(&ripcbinfo); 659 } 660 661 static int 662 rip_disconnect(struct socket *so) 663 { 664 struct inpcb *inp; 665 666 if ((so->so_state & SS_ISCONNECTED) == 0) 667 return ENOTCONN; 668 669 inp = sotoinpcb(so); 670 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 671 INP_INFO_WLOCK(&ripcbinfo); 672 INP_LOCK(inp); 673 inp->inp_faddr.s_addr = INADDR_ANY; 674 SOCK_LOCK(so); 675 so->so_state &= ~SS_ISCONNECTED; 676 SOCK_UNLOCK(so); 677 INP_UNLOCK(inp); 678 INP_INFO_WUNLOCK(&ripcbinfo); 679 return (0); 680 } 681 682 static int 683 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 684 { 685 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 686 struct inpcb *inp; 687 688 if (nam->sa_len != sizeof(*addr)) 689 return EINVAL; 690 691 if (jailed(td->td_ucred)) { 692 if (addr->sin_addr.s_addr == INADDR_ANY) 693 addr->sin_addr.s_addr = 694 htonl(prison_getip(td->td_ucred)); 695 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 696 return (EADDRNOTAVAIL); 697 } 698 699 if (TAILQ_EMPTY(&ifnet) || 700 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 701 (addr->sin_addr.s_addr && 702 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 703 return EADDRNOTAVAIL; 704 705 inp = sotoinpcb(so); 706 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 707 INP_INFO_WLOCK(&ripcbinfo); 708 INP_LOCK(inp); 709 inp->inp_laddr = addr->sin_addr; 710 INP_UNLOCK(inp); 711 INP_INFO_WUNLOCK(&ripcbinfo); 712 return 0; 713 } 714 715 static int 716 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 717 { 718 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 719 struct inpcb *inp; 720 721 if (nam->sa_len != sizeof(*addr)) 722 return EINVAL; 723 if (TAILQ_EMPTY(&ifnet)) 724 return EADDRNOTAVAIL; 725 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 726 return EAFNOSUPPORT; 727 728 inp = sotoinpcb(so); 729 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 730 INP_INFO_WLOCK(&ripcbinfo); 731 INP_LOCK(inp); 732 inp->inp_faddr = addr->sin_addr; 733 soisconnected(so); 734 INP_UNLOCK(inp); 735 INP_INFO_WUNLOCK(&ripcbinfo); 736 return 0; 737 } 738 739 static int 740 rip_shutdown(struct socket *so) 741 { 742 struct inpcb *inp; 743 744 inp = sotoinpcb(so); 745 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 746 INP_LOCK(inp); 747 socantsendmore(so); 748 INP_UNLOCK(inp); 749 return 0; 750 } 751 752 static int 753 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 754 struct mbuf *control, struct thread *td) 755 { 756 struct inpcb *inp; 757 u_long dst; 758 759 inp = sotoinpcb(so); 760 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 761 /* 762 * Note: 'dst' reads below are unlocked. 763 */ 764 if (so->so_state & SS_ISCONNECTED) { 765 if (nam) { 766 m_freem(m); 767 return EISCONN; 768 } 769 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 770 } else { 771 if (nam == NULL) { 772 m_freem(m); 773 return ENOTCONN; 774 } 775 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 776 } 777 return rip_output(m, so, dst); 778 } 779 780 static int 781 rip_pcblist(SYSCTL_HANDLER_ARGS) 782 { 783 int error, i, n; 784 struct inpcb *inp, **inp_list; 785 inp_gen_t gencnt; 786 struct xinpgen xig; 787 788 /* 789 * The process of preparing the TCB list is too time-consuming and 790 * resource-intensive to repeat twice on every request. 791 */ 792 if (req->oldptr == 0) { 793 n = ripcbinfo.ipi_count; 794 req->oldidx = 2 * (sizeof xig) 795 + (n + n/8) * sizeof(struct xinpcb); 796 return 0; 797 } 798 799 if (req->newptr != 0) 800 return EPERM; 801 802 /* 803 * OK, now we're committed to doing something. 804 */ 805 INP_INFO_RLOCK(&ripcbinfo); 806 gencnt = ripcbinfo.ipi_gencnt; 807 n = ripcbinfo.ipi_count; 808 INP_INFO_RUNLOCK(&ripcbinfo); 809 810 xig.xig_len = sizeof xig; 811 xig.xig_count = n; 812 xig.xig_gen = gencnt; 813 xig.xig_sogen = so_gencnt; 814 error = SYSCTL_OUT(req, &xig, sizeof xig); 815 if (error) 816 return error; 817 818 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 819 if (inp_list == 0) 820 return ENOMEM; 821 822 INP_INFO_RLOCK(&ripcbinfo); 823 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n; 824 inp = LIST_NEXT(inp, inp_list)) { 825 INP_LOCK(inp); 826 if (inp->inp_gencnt <= gencnt && 827 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 828 /* XXX held references? */ 829 inp_list[i++] = inp; 830 } 831 INP_UNLOCK(inp); 832 } 833 INP_INFO_RUNLOCK(&ripcbinfo); 834 n = i; 835 836 error = 0; 837 for (i = 0; i < n; i++) { 838 inp = inp_list[i]; 839 if (inp->inp_gencnt <= gencnt) { 840 struct xinpcb xi; 841 bzero(&xi, sizeof(xi)); 842 xi.xi_len = sizeof xi; 843 /* XXX should avoid extra copy */ 844 bcopy(inp, &xi.xi_inp, sizeof *inp); 845 if (inp->inp_socket) 846 sotoxsocket(inp->inp_socket, &xi.xi_socket); 847 error = SYSCTL_OUT(req, &xi, sizeof xi); 848 } 849 } 850 if (!error) { 851 /* 852 * Give the user an updated idea of our state. 853 * If the generation differs from what we told 854 * her before, she knows that something happened 855 * while we were processing this request, and it 856 * might be necessary to retry. 857 */ 858 INP_INFO_RLOCK(&ripcbinfo); 859 xig.xig_gen = ripcbinfo.ipi_gencnt; 860 xig.xig_sogen = so_gencnt; 861 xig.xig_count = ripcbinfo.ipi_count; 862 INP_INFO_RUNLOCK(&ripcbinfo); 863 error = SYSCTL_OUT(req, &xig, sizeof xig); 864 } 865 free(inp_list, M_TEMP); 866 return error; 867 } 868 869 /* 870 * This is the wrapper function for in_setsockaddr. We just pass down 871 * the pcbinfo for in_setpeeraddr to lock. 872 */ 873 static int 874 rip_sockaddr(struct socket *so, struct sockaddr **nam) 875 { 876 return (in_setsockaddr(so, nam, &ripcbinfo)); 877 } 878 879 /* 880 * This is the wrapper function for in_setpeeraddr. We just pass down 881 * the pcbinfo for in_setpeeraddr to lock. 882 */ 883 static int 884 rip_peeraddr(struct socket *so, struct sockaddr **nam) 885 { 886 return (in_setpeeraddr(so, nam, &ripcbinfo)); 887 } 888 889 890 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 891 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 892 893 struct pr_usrreqs rip_usrreqs = { 894 .pru_abort = rip_abort, 895 .pru_attach = rip_attach, 896 .pru_bind = rip_bind, 897 .pru_connect = rip_connect, 898 .pru_control = in_control, 899 .pru_detach = rip_detach, 900 .pru_disconnect = rip_disconnect, 901 .pru_peeraddr = rip_peeraddr, 902 .pru_send = rip_send, 903 .pru_shutdown = rip_shutdown, 904 .pru_sockaddr = rip_sockaddr, 905 .pru_sosetlabel = in_pcbsosetlabel 906 }; 907