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