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. 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: releng/5.3/sys/netinet/raw_ip.c 145954 2005-05-06 02:50:35Z cperciva $ 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 void 120 rip_init() 121 { 122 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 123 LIST_INIT(&ripcb); 124 ripcbinfo.listhead = &ripcb; 125 /* 126 * XXX We don't use the hash list for raw IP, but it's easier 127 * to allocate a one entry hash list than it is to check all 128 * over the place for hashbase == NULL. 129 */ 130 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 131 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask); 132 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 133 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 134 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 135 } 136 137 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 138 139 static int 140 raw_append(struct inpcb *last, struct ip *ip, struct mbuf *n) 141 { 142 int policyfail = 0; 143 144 INP_LOCK_ASSERT(last); 145 146 #if defined(IPSEC) || defined(FAST_IPSEC) 147 /* check AH/ESP integrity. */ 148 if (ipsec4_in_reject(n, last)) { 149 policyfail = 1; 150 #ifdef IPSEC 151 ipsecstat.in_polvio++; 152 #endif /*IPSEC*/ 153 /* do not inject data to pcb */ 154 } 155 #endif /*IPSEC || FAST_IPSEC*/ 156 #ifdef MAC 157 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 158 policyfail = 1; 159 #endif 160 if (!policyfail) { 161 struct mbuf *opts = NULL; 162 struct socket *so; 163 164 so = last->inp_socket; 165 if ((last->inp_flags & INP_CONTROLOPTS) || 166 (so->so_options & SO_TIMESTAMP)) 167 ip_savecontrol(last, &opts, ip, n); 168 SOCKBUF_LOCK(&so->so_rcv); 169 if (sbappendaddr_locked(&so->so_rcv, 170 (struct sockaddr *)&ripsrc, n, opts) == 0) { 171 /* should notify about lost packet */ 172 m_freem(n); 173 if (opts) 174 m_freem(opts); 175 SOCKBUF_UNLOCK(&so->so_rcv); 176 } else 177 sorwakeup_locked(so); 178 } else 179 m_freem(n); 180 return policyfail; 181 } 182 183 /* 184 * Setup generic address and protocol structures 185 * for raw_input routine, then pass them along with 186 * mbuf chain. 187 */ 188 void 189 rip_input(struct mbuf *m, int off) 190 { 191 struct ip *ip = mtod(m, struct ip *); 192 int proto = ip->ip_p; 193 struct inpcb *inp, *last; 194 195 INP_INFO_RLOCK(&ripcbinfo); 196 ripsrc.sin_addr = ip->ip_src; 197 last = NULL; 198 LIST_FOREACH(inp, &ripcb, inp_list) { 199 INP_LOCK(inp); 200 if (inp->inp_ip_p && inp->inp_ip_p != proto) { 201 docontinue: 202 INP_UNLOCK(inp); 203 continue; 204 } 205 #ifdef INET6 206 if ((inp->inp_vflag & INP_IPV4) == 0) 207 goto docontinue; 208 #endif 209 if (inp->inp_laddr.s_addr && 210 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 211 goto docontinue; 212 if (inp->inp_faddr.s_addr && 213 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 214 goto docontinue; 215 if (jailed(inp->inp_socket->so_cred)) 216 if (htonl(prison_getip(inp->inp_socket->so_cred)) != 217 ip->ip_dst.s_addr) 218 goto docontinue; 219 if (last) { 220 struct mbuf *n; 221 222 n = m_copy(m, 0, (int)M_COPYALL); 223 if (n != NULL) 224 (void) raw_append(last, ip, n); 225 /* XXX count dropped packet */ 226 INP_UNLOCK(last); 227 } 228 last = inp; 229 } 230 if (last != NULL) { 231 if (raw_append(last, ip, m) != 0) 232 ipstat.ips_delivered--; 233 INP_UNLOCK(last); 234 } else { 235 m_freem(m); 236 ipstat.ips_noproto++; 237 ipstat.ips_delivered--; 238 } 239 INP_INFO_RUNLOCK(&ripcbinfo); 240 } 241 242 /* 243 * Generate IP header and pass packet to ip_output. 244 * Tack on options user may have setup with control call. 245 */ 246 int 247 rip_output(struct mbuf *m, struct socket *so, u_long dst) 248 { 249 struct ip *ip; 250 int error; 251 struct inpcb *inp = sotoinpcb(so); 252 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 253 254 /* 255 * If the user handed us a complete IP packet, use it. 256 * Otherwise, allocate an mbuf for a header and fill it in. 257 */ 258 if ((inp->inp_flags & INP_HDRINCL) == 0) { 259 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 260 m_freem(m); 261 return(EMSGSIZE); 262 } 263 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 264 if (m == NULL) 265 return(ENOBUFS); 266 267 INP_LOCK(inp); 268 ip = mtod(m, struct ip *); 269 ip->ip_tos = inp->inp_ip_tos; 270 ip->ip_off = 0; 271 ip->ip_p = inp->inp_ip_p; 272 ip->ip_len = m->m_pkthdr.len; 273 if (jailed(inp->inp_socket->so_cred)) 274 ip->ip_src.s_addr = 275 htonl(prison_getip(inp->inp_socket->so_cred)); 276 else 277 ip->ip_src = inp->inp_laddr; 278 ip->ip_dst.s_addr = dst; 279 ip->ip_ttl = inp->inp_ip_ttl; 280 } else { 281 if (m->m_pkthdr.len > IP_MAXPACKET) { 282 m_freem(m); 283 return(EMSGSIZE); 284 } 285 INP_LOCK(inp); 286 ip = mtod(m, struct ip *); 287 if (jailed(inp->inp_socket->so_cred)) { 288 if (ip->ip_src.s_addr != 289 htonl(prison_getip(inp->inp_socket->so_cred))) { 290 INP_UNLOCK(inp); 291 m_freem(m); 292 return (EPERM); 293 } 294 } 295 /* don't allow both user specified and setsockopt options, 296 and don't allow packet length sizes that will crash */ 297 if (((ip->ip_hl != (sizeof (*ip) >> 2)) 298 && inp->inp_options) 299 || (ip->ip_len > m->m_pkthdr.len) 300 || (ip->ip_len < (ip->ip_hl << 2))) { 301 INP_UNLOCK(inp); 302 m_freem(m); 303 return EINVAL; 304 } 305 if (ip->ip_id == 0) 306 ip->ip_id = ip_newid(); 307 /* XXX prevent ip_output from overwriting header fields */ 308 flags |= IP_RAWOUTPUT; 309 ipstat.ips_rawout++; 310 } 311 312 if (inp->inp_flags & INP_ONESBCAST) 313 flags |= IP_SENDONES; 314 315 #ifdef MAC 316 mac_create_mbuf_from_inpcb(inp, m); 317 #endif 318 319 error = ip_output(m, inp->inp_options, NULL, flags, 320 inp->inp_moptions, inp); 321 INP_UNLOCK(inp); 322 return error; 323 } 324 325 /* 326 * Raw IP socket option processing. 327 * 328 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 329 * only be created by a privileged process, and as such, socket option 330 * operations to manage system properties on any raw socket were allowed to 331 * take place without explicit additional access control checks. However, 332 * raw sockets can now also be created in jail(), and therefore explicit 333 * checks are now required. Likewise, raw sockets can be used by a process 334 * after it gives up privilege, so some caution is required. For options 335 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 336 * performed in ip_ctloutput() and therefore no check occurs here. 337 * Unilaterally checking suser() here breaks normal IP socket option 338 * operations on raw sockets. 339 * 340 * When adding new socket options here, make sure to add access control 341 * checks here as necessary. 342 */ 343 int 344 rip_ctloutput(struct socket *so, struct sockopt *sopt) 345 { 346 struct inpcb *inp = sotoinpcb(so); 347 int error, optval; 348 349 if (sopt->sopt_level != IPPROTO_IP) 350 return (EINVAL); 351 352 error = 0; 353 switch (sopt->sopt_dir) { 354 case SOPT_GET: 355 switch (sopt->sopt_name) { 356 case IP_HDRINCL: 357 optval = inp->inp_flags & INP_HDRINCL; 358 error = sooptcopyout(sopt, &optval, sizeof optval); 359 break; 360 361 case IP_FW_ADD: /* ADD actually returns the body... */ 362 case IP_FW_GET: 363 case IP_FW_TABLE_GETSIZE: 364 case IP_FW_TABLE_LIST: 365 error = suser(curthread); 366 if (error != 0) 367 return (error); 368 if (ip_fw_ctl_ptr != NULL) 369 error = ip_fw_ctl_ptr(sopt); 370 else 371 error = ENOPROTOOPT; 372 break; 373 374 case IP_DUMMYNET_GET: 375 error = suser(curthread); 376 if (error != 0) 377 return (error); 378 if (ip_dn_ctl_ptr != NULL) 379 error = ip_dn_ctl_ptr(sopt); 380 else 381 error = ENOPROTOOPT; 382 break ; 383 384 case MRT_INIT: 385 case MRT_DONE: 386 case MRT_ADD_VIF: 387 case MRT_DEL_VIF: 388 case MRT_ADD_MFC: 389 case MRT_DEL_MFC: 390 case MRT_VERSION: 391 case MRT_ASSERT: 392 case MRT_API_SUPPORT: 393 case MRT_API_CONFIG: 394 case MRT_ADD_BW_UPCALL: 395 case MRT_DEL_BW_UPCALL: 396 error = suser(curthread); 397 if (error != 0) 398 return (error); 399 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 400 EOPNOTSUPP; 401 break; 402 403 default: 404 error = ip_ctloutput(so, sopt); 405 break; 406 } 407 break; 408 409 case SOPT_SET: 410 switch (sopt->sopt_name) { 411 case IP_HDRINCL: 412 error = sooptcopyin(sopt, &optval, sizeof optval, 413 sizeof optval); 414 if (error) 415 break; 416 if (optval) 417 inp->inp_flags |= INP_HDRINCL; 418 else 419 inp->inp_flags &= ~INP_HDRINCL; 420 break; 421 422 case IP_FW_ADD: 423 case IP_FW_DEL: 424 case IP_FW_FLUSH: 425 case IP_FW_ZERO: 426 case IP_FW_RESETLOG: 427 case IP_FW_TABLE_ADD: 428 case IP_FW_TABLE_DEL: 429 case IP_FW_TABLE_FLUSH: 430 error = suser(curthread); 431 if (error != 0) 432 return (error); 433 if (ip_fw_ctl_ptr != NULL) 434 error = ip_fw_ctl_ptr(sopt); 435 else 436 error = ENOPROTOOPT; 437 break; 438 439 case IP_DUMMYNET_CONFIGURE: 440 case IP_DUMMYNET_DEL: 441 case IP_DUMMYNET_FLUSH: 442 error = suser(curthread); 443 if (error != 0) 444 return (error); 445 if (ip_dn_ctl_ptr != NULL) 446 error = ip_dn_ctl_ptr(sopt); 447 else 448 error = ENOPROTOOPT ; 449 break ; 450 451 case IP_RSVP_ON: 452 error = suser(curthread); 453 if (error != 0) 454 return (error); 455 error = ip_rsvp_init(so); 456 break; 457 458 case IP_RSVP_OFF: 459 error = suser(curthread); 460 if (error != 0) 461 return (error); 462 error = ip_rsvp_done(); 463 break; 464 465 case IP_RSVP_VIF_ON: 466 case IP_RSVP_VIF_OFF: 467 error = suser(curthread); 468 if (error != 0) 469 return (error); 470 error = ip_rsvp_vif ? 471 ip_rsvp_vif(so, sopt) : EINVAL; 472 break; 473 474 case MRT_INIT: 475 case MRT_DONE: 476 case MRT_ADD_VIF: 477 case MRT_DEL_VIF: 478 case MRT_ADD_MFC: 479 case MRT_DEL_MFC: 480 case MRT_VERSION: 481 case MRT_ASSERT: 482 case MRT_API_SUPPORT: 483 case MRT_API_CONFIG: 484 case MRT_ADD_BW_UPCALL: 485 case MRT_DEL_BW_UPCALL: 486 error = suser(curthread); 487 if (error != 0) 488 return (error); 489 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 490 EOPNOTSUPP; 491 break; 492 493 default: 494 error = ip_ctloutput(so, sopt); 495 break; 496 } 497 break; 498 } 499 500 return (error); 501 } 502 503 /* 504 * This function exists solely to receive the PRC_IFDOWN messages which 505 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 506 * and calls in_ifadown() to remove all routes corresponding to that address. 507 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 508 * interface routes. 509 */ 510 void 511 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 512 { 513 struct in_ifaddr *ia; 514 struct ifnet *ifp; 515 int err; 516 int flags; 517 518 switch (cmd) { 519 case PRC_IFDOWN: 520 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 521 if (ia->ia_ifa.ifa_addr == sa 522 && (ia->ia_flags & IFA_ROUTE)) { 523 /* 524 * in_ifscrub kills the interface route. 525 */ 526 in_ifscrub(ia->ia_ifp, ia); 527 /* 528 * in_ifadown gets rid of all the rest of 529 * the routes. This is not quite the right 530 * thing to do, but at least if we are running 531 * a routing process they will come back. 532 */ 533 in_ifadown(&ia->ia_ifa, 0); 534 break; 535 } 536 } 537 break; 538 539 case PRC_IFUP: 540 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 541 if (ia->ia_ifa.ifa_addr == sa) 542 break; 543 } 544 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 545 return; 546 flags = RTF_UP; 547 ifp = ia->ia_ifa.ifa_ifp; 548 549 if ((ifp->if_flags & IFF_LOOPBACK) 550 || (ifp->if_flags & IFF_POINTOPOINT)) 551 flags |= RTF_HOST; 552 553 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 554 if (err == 0) 555 ia->ia_flags |= IFA_ROUTE; 556 break; 557 } 558 } 559 560 u_long rip_sendspace = RIPSNDQ; 561 u_long rip_recvspace = RIPRCVQ; 562 563 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 564 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 565 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 566 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 567 568 static int 569 rip_attach(struct socket *so, int proto, struct thread *td) 570 { 571 struct inpcb *inp; 572 int error; 573 574 /* XXX why not lower? */ 575 INP_INFO_WLOCK(&ripcbinfo); 576 inp = sotoinpcb(so); 577 if (inp) { 578 /* XXX counter, printf */ 579 INP_INFO_WUNLOCK(&ripcbinfo); 580 return EINVAL; 581 } 582 if (td && jailed(td->td_ucred) && !jail_allow_raw_sockets) { 583 INP_INFO_WUNLOCK(&ripcbinfo); 584 return (EPERM); 585 } 586 if (td && (error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL)) != 0) { 587 INP_INFO_WUNLOCK(&ripcbinfo); 588 return error; 589 } 590 if (proto >= IPPROTO_MAX || proto < 0) { 591 INP_INFO_WUNLOCK(&ripcbinfo); 592 return EPROTONOSUPPORT; 593 } 594 595 error = soreserve(so, rip_sendspace, rip_recvspace); 596 if (error) { 597 INP_INFO_WUNLOCK(&ripcbinfo); 598 return error; 599 } 600 error = in_pcballoc(so, &ripcbinfo, "rawinp"); 601 if (error) { 602 INP_INFO_WUNLOCK(&ripcbinfo); 603 return error; 604 } 605 inp = (struct inpcb *)so->so_pcb; 606 INP_LOCK(inp); 607 INP_INFO_WUNLOCK(&ripcbinfo); 608 inp->inp_vflag |= INP_IPV4; 609 inp->inp_ip_p = proto; 610 inp->inp_ip_ttl = ip_defttl; 611 INP_UNLOCK(inp); 612 return 0; 613 } 614 615 static void 616 rip_pcbdetach(struct socket *so, struct inpcb *inp) 617 { 618 INP_INFO_WLOCK_ASSERT(&ripcbinfo); 619 INP_LOCK_ASSERT(inp); 620 621 if (so == ip_mrouter && ip_mrouter_done) 622 ip_mrouter_done(); 623 if (ip_rsvp_force_done) 624 ip_rsvp_force_done(so); 625 if (so == ip_rsvpd) 626 ip_rsvp_done(); 627 in_pcbdetach(inp); 628 } 629 630 static int 631 rip_detach(struct socket *so) 632 { 633 struct inpcb *inp; 634 635 INP_INFO_WLOCK(&ripcbinfo); 636 inp = sotoinpcb(so); 637 if (inp == 0) { 638 /* XXX counter, printf */ 639 INP_INFO_WUNLOCK(&ripcbinfo); 640 return EINVAL; 641 } 642 INP_LOCK(inp); 643 rip_pcbdetach(so, inp); 644 INP_INFO_WUNLOCK(&ripcbinfo); 645 return 0; 646 } 647 648 static int 649 rip_abort(struct socket *so) 650 { 651 struct inpcb *inp; 652 653 INP_INFO_WLOCK(&ripcbinfo); 654 inp = sotoinpcb(so); 655 if (inp == 0) { 656 INP_INFO_WUNLOCK(&ripcbinfo); 657 return EINVAL; /* ??? possible? panic instead? */ 658 } 659 INP_LOCK(inp); 660 soisdisconnected(so); 661 if (so->so_state & SS_NOFDREF) 662 rip_pcbdetach(so, inp); 663 else 664 INP_UNLOCK(inp); 665 INP_INFO_WUNLOCK(&ripcbinfo); 666 return 0; 667 } 668 669 static int 670 rip_disconnect(struct socket *so) 671 { 672 if ((so->so_state & SS_ISCONNECTED) == 0) 673 return ENOTCONN; 674 return rip_abort(so); 675 } 676 677 static int 678 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 679 { 680 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 681 struct inpcb *inp; 682 683 if (nam->sa_len != sizeof(*addr)) 684 return EINVAL; 685 686 if (jailed(td->td_ucred)) { 687 if (addr->sin_addr.s_addr == INADDR_ANY) 688 addr->sin_addr.s_addr = 689 htonl(prison_getip(td->td_ucred)); 690 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 691 return (EADDRNOTAVAIL); 692 } 693 694 if (TAILQ_EMPTY(&ifnet) || 695 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 696 (addr->sin_addr.s_addr && 697 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 698 return EADDRNOTAVAIL; 699 700 INP_INFO_WLOCK(&ripcbinfo); 701 inp = sotoinpcb(so); 702 if (inp == 0) { 703 INP_INFO_WUNLOCK(&ripcbinfo); 704 return EINVAL; 705 } 706 INP_LOCK(inp); 707 inp->inp_laddr = addr->sin_addr; 708 INP_UNLOCK(inp); 709 INP_INFO_WUNLOCK(&ripcbinfo); 710 return 0; 711 } 712 713 static int 714 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 715 { 716 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 717 struct inpcb *inp; 718 719 if (nam->sa_len != sizeof(*addr)) 720 return EINVAL; 721 if (TAILQ_EMPTY(&ifnet)) 722 return EADDRNOTAVAIL; 723 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 724 return EAFNOSUPPORT; 725 726 INP_INFO_WLOCK(&ripcbinfo); 727 inp = sotoinpcb(so); 728 if (inp == 0) { 729 INP_INFO_WUNLOCK(&ripcbinfo); 730 return EINVAL; 731 } 732 INP_LOCK(inp); 733 inp->inp_faddr = addr->sin_addr; 734 soisconnected(so); 735 INP_UNLOCK(inp); 736 INP_INFO_WUNLOCK(&ripcbinfo); 737 return 0; 738 } 739 740 static int 741 rip_shutdown(struct socket *so) 742 { 743 struct inpcb *inp; 744 745 INP_INFO_RLOCK(&ripcbinfo); 746 inp = sotoinpcb(so); 747 if (inp == 0) { 748 INP_INFO_RUNLOCK(&ripcbinfo); 749 return EINVAL; 750 } 751 INP_LOCK(inp); 752 INP_INFO_RUNLOCK(&ripcbinfo); 753 socantsendmore(so); 754 INP_UNLOCK(inp); 755 return 0; 756 } 757 758 static int 759 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 760 struct mbuf *control, struct thread *td) 761 { 762 struct inpcb *inp; 763 u_long dst; 764 int ret; 765 766 INP_INFO_WLOCK(&ripcbinfo); 767 inp = sotoinpcb(so); 768 if (so->so_state & SS_ISCONNECTED) { 769 if (nam) { 770 INP_INFO_WUNLOCK(&ripcbinfo); 771 m_freem(m); 772 return EISCONN; 773 } 774 dst = inp->inp_faddr.s_addr; 775 } else { 776 if (nam == NULL) { 777 INP_INFO_WUNLOCK(&ripcbinfo); 778 m_freem(m); 779 return ENOTCONN; 780 } 781 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 782 } 783 ret = rip_output(m, so, dst); 784 INP_INFO_WUNLOCK(&ripcbinfo); 785 return ret; 786 } 787 788 static int 789 rip_pcblist(SYSCTL_HANDLER_ARGS) 790 { 791 int error, i, n; 792 struct inpcb *inp, **inp_list; 793 inp_gen_t gencnt; 794 struct xinpgen xig; 795 796 /* 797 * The process of preparing the TCB list is too time-consuming and 798 * resource-intensive to repeat twice on every request. 799 */ 800 if (req->oldptr == 0) { 801 n = ripcbinfo.ipi_count; 802 req->oldidx = 2 * (sizeof xig) 803 + (n + n/8) * sizeof(struct xinpcb); 804 return 0; 805 } 806 807 if (req->newptr != 0) 808 return EPERM; 809 810 /* 811 * OK, now we're committed to doing something. 812 */ 813 INP_INFO_RLOCK(&ripcbinfo); 814 gencnt = ripcbinfo.ipi_gencnt; 815 n = ripcbinfo.ipi_count; 816 INP_INFO_RUNLOCK(&ripcbinfo); 817 818 xig.xig_len = sizeof xig; 819 xig.xig_count = n; 820 xig.xig_gen = gencnt; 821 xig.xig_sogen = so_gencnt; 822 error = SYSCTL_OUT(req, &xig, sizeof xig); 823 if (error) 824 return error; 825 826 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 827 if (inp_list == 0) 828 return ENOMEM; 829 830 INP_INFO_RLOCK(&ripcbinfo); 831 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n; 832 inp = LIST_NEXT(inp, inp_list)) { 833 INP_LOCK(inp); 834 if (inp->inp_gencnt <= gencnt && 835 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 836 /* XXX held references? */ 837 inp_list[i++] = inp; 838 } 839 INP_UNLOCK(inp); 840 } 841 INP_INFO_RUNLOCK(&ripcbinfo); 842 n = i; 843 844 error = 0; 845 for (i = 0; i < n; i++) { 846 inp = inp_list[i]; 847 if (inp->inp_gencnt <= gencnt) { 848 struct xinpcb xi; 849 bzero(&xi, sizeof(xi)); 850 xi.xi_len = sizeof xi; 851 /* XXX should avoid extra copy */ 852 bcopy(inp, &xi.xi_inp, sizeof *inp); 853 if (inp->inp_socket) 854 sotoxsocket(inp->inp_socket, &xi.xi_socket); 855 error = SYSCTL_OUT(req, &xi, sizeof xi); 856 } 857 } 858 if (!error) { 859 /* 860 * Give the user an updated idea of our state. 861 * If the generation differs from what we told 862 * her before, she knows that something happened 863 * while we were processing this request, and it 864 * might be necessary to retry. 865 */ 866 INP_INFO_RLOCK(&ripcbinfo); 867 xig.xig_gen = ripcbinfo.ipi_gencnt; 868 xig.xig_sogen = so_gencnt; 869 xig.xig_count = ripcbinfo.ipi_count; 870 INP_INFO_RUNLOCK(&ripcbinfo); 871 error = SYSCTL_OUT(req, &xig, sizeof xig); 872 } 873 free(inp_list, M_TEMP); 874 return error; 875 } 876 877 /* 878 * This is the wrapper function for in_setsockaddr. We just pass down 879 * the pcbinfo for in_setpeeraddr to lock. 880 */ 881 static int 882 rip_sockaddr(struct socket *so, struct sockaddr **nam) 883 { 884 return (in_setsockaddr(so, nam, &ripcbinfo)); 885 } 886 887 /* 888 * This is the wrapper function for in_setpeeraddr. We just pass down 889 * the pcbinfo for in_setpeeraddr to lock. 890 */ 891 static int 892 rip_peeraddr(struct socket *so, struct sockaddr **nam) 893 { 894 return (in_setpeeraddr(so, nam, &ripcbinfo)); 895 } 896 897 898 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 899 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 900 901 struct pr_usrreqs rip_usrreqs = { 902 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 903 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 904 pru_listen_notsupp, rip_peeraddr, pru_rcvd_notsupp, 905 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 906 rip_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 907 };
Cache object: a9ac4ecefc734175b9f4a62049d4df9f
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