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/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/priv.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 IPSEC 70 #include <netipsec/ipsec.h> 71 #endif /*IPSEC*/ 72 73 #include <security/mac/mac_framework.h> 74 75 struct inpcbhead ripcb; 76 struct inpcbinfo ripcbinfo; 77 78 /* control hooks for ipfw and dummynet */ 79 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 80 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 81 82 /* 83 * hooks for multicast routing. They all default to NULL, 84 * so leave them not initialized and rely on BSS being set to 0. 85 */ 86 87 /* The socket used to communicate with the multicast routing daemon. */ 88 struct socket *ip_mrouter; 89 90 /* The various mrouter and rsvp functions */ 91 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 92 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 93 int (*ip_mrouter_done)(void); 94 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 95 struct ip_moptions *); 96 int (*mrt_ioctl)(int, caddr_t); 97 int (*legal_vif_num)(int); 98 u_long (*ip_mcast_src)(int); 99 100 void (*rsvp_input_p)(struct mbuf *m, int off); 101 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 102 void (*ip_rsvp_force_done)(struct socket *); 103 104 /* 105 * Raw interface to IP protocol. 106 */ 107 108 /* 109 * Initialize raw connection block q. 110 */ 111 static void 112 rip_zone_change(void *tag) 113 { 114 115 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 116 } 117 118 static int 119 rip_inpcb_init(void *mem, int size, int flags) 120 { 121 struct inpcb *inp = mem; 122 123 INP_LOCK_INIT(inp, "inp", "rawinp"); 124 return (0); 125 } 126 127 void 128 rip_init(void) 129 { 130 131 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 132 LIST_INIT(&ripcb); 133 ripcbinfo.ipi_listhead = &ripcb; 134 /* 135 * XXX We don't use the hash list for raw IP, but it's easier 136 * to allocate a one entry hash list than it is to check all 137 * over the place for hashbase == NULL. 138 */ 139 ripcbinfo.ipi_hashbase = hashinit(1, M_PCB, &ripcbinfo.ipi_hashmask); 140 ripcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 141 &ripcbinfo.ipi_porthashmask); 142 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 143 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 144 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 145 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, 146 NULL, EVENTHANDLER_PRI_ANY); 147 } 148 149 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 150 151 static int 152 raw_append(struct inpcb *last, struct ip *ip, struct mbuf *n) 153 { 154 int policyfail = 0; 155 156 INP_LOCK_ASSERT(last); 157 158 #ifdef IPSEC 159 /* check AH/ESP integrity. */ 160 if (ipsec4_in_reject(n, last)) { 161 policyfail = 1; 162 } 163 #endif /* IPSEC */ 164 #ifdef MAC 165 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 166 policyfail = 1; 167 #endif 168 /* Check the minimum TTL for socket. */ 169 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 170 policyfail = 1; 171 if (!policyfail) { 172 struct mbuf *opts = NULL; 173 struct socket *so; 174 175 so = last->inp_socket; 176 if ((last->inp_flags & INP_CONTROLOPTS) || 177 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 178 ip_savecontrol(last, &opts, ip, n); 179 SOCKBUF_LOCK(&so->so_rcv); 180 if (sbappendaddr_locked(&so->so_rcv, 181 (struct sockaddr *)&ripsrc, n, opts) == 0) { 182 /* should notify about lost packet */ 183 m_freem(n); 184 if (opts) 185 m_freem(opts); 186 SOCKBUF_UNLOCK(&so->so_rcv); 187 } else 188 sorwakeup_locked(so); 189 } else 190 m_freem(n); 191 return policyfail; 192 } 193 194 /* 195 * Setup generic address and protocol structures 196 * for raw_input routine, then pass them along with 197 * mbuf chain. 198 */ 199 void 200 rip_input(struct mbuf *m, int off) 201 { 202 struct ip *ip = mtod(m, struct ip *); 203 int proto = ip->ip_p; 204 struct inpcb *inp, *last; 205 206 INP_INFO_RLOCK(&ripcbinfo); 207 ripsrc.sin_addr = ip->ip_src; 208 last = NULL; 209 LIST_FOREACH(inp, &ripcb, inp_list) { 210 INP_LOCK(inp); 211 if (inp->inp_ip_p && inp->inp_ip_p != proto) { 212 docontinue: 213 INP_UNLOCK(inp); 214 continue; 215 } 216 #ifdef INET6 217 if ((inp->inp_vflag & INP_IPV4) == 0) 218 goto docontinue; 219 #endif 220 if (inp->inp_laddr.s_addr && 221 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 222 goto docontinue; 223 if (inp->inp_faddr.s_addr && 224 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 225 goto docontinue; 226 if (jailed(inp->inp_socket->so_cred)) 227 if (htonl(prison_getip(inp->inp_socket->so_cred)) != 228 ip->ip_dst.s_addr) 229 goto docontinue; 230 if (last) { 231 struct mbuf *n; 232 233 n = m_copy(m, 0, (int)M_COPYALL); 234 if (n != NULL) 235 (void) raw_append(last, ip, n); 236 /* XXX count dropped packet */ 237 INP_UNLOCK(last); 238 } 239 last = inp; 240 } 241 if (last != NULL) { 242 if (raw_append(last, ip, m) != 0) 243 ipstat.ips_delivered--; 244 INP_UNLOCK(last); 245 } else { 246 m_freem(m); 247 ipstat.ips_noproto++; 248 ipstat.ips_delivered--; 249 } 250 INP_INFO_RUNLOCK(&ripcbinfo); 251 } 252 253 /* 254 * Generate IP header and pass packet to ip_output. 255 * Tack on options user may have setup with control call. 256 */ 257 int 258 rip_output(struct mbuf *m, struct socket *so, u_long dst) 259 { 260 struct ip *ip; 261 int error; 262 struct inpcb *inp = sotoinpcb(so); 263 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 264 IP_ALLOWBROADCAST; 265 266 /* 267 * If the user handed us a complete IP packet, use it. 268 * Otherwise, allocate an mbuf for a header and fill it in. 269 */ 270 if ((inp->inp_flags & INP_HDRINCL) == 0) { 271 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 272 m_freem(m); 273 return(EMSGSIZE); 274 } 275 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 276 if (m == NULL) 277 return(ENOBUFS); 278 279 INP_LOCK(inp); 280 ip = mtod(m, struct ip *); 281 ip->ip_tos = inp->inp_ip_tos; 282 if (inp->inp_flags & INP_DONTFRAG) 283 ip->ip_off = IP_DF; 284 else 285 ip->ip_off = 0; 286 ip->ip_p = inp->inp_ip_p; 287 ip->ip_len = m->m_pkthdr.len; 288 if (jailed(inp->inp_socket->so_cred)) 289 ip->ip_src.s_addr = 290 htonl(prison_getip(inp->inp_socket->so_cred)); 291 else 292 ip->ip_src = inp->inp_laddr; 293 ip->ip_dst.s_addr = dst; 294 ip->ip_ttl = inp->inp_ip_ttl; 295 } else { 296 if (m->m_pkthdr.len > IP_MAXPACKET) { 297 m_freem(m); 298 return(EMSGSIZE); 299 } 300 INP_LOCK(inp); 301 ip = mtod(m, struct ip *); 302 if (jailed(inp->inp_socket->so_cred)) { 303 if (ip->ip_src.s_addr != 304 htonl(prison_getip(inp->inp_socket->so_cred))) { 305 INP_UNLOCK(inp); 306 m_freem(m); 307 return (EPERM); 308 } 309 } 310 /* don't allow both user specified and setsockopt options, 311 and don't allow packet length sizes that will crash */ 312 if (((ip->ip_hl != (sizeof (*ip) >> 2)) 313 && inp->inp_options) 314 || (ip->ip_len > m->m_pkthdr.len) 315 || (ip->ip_len < (ip->ip_hl << 2))) { 316 INP_UNLOCK(inp); 317 m_freem(m); 318 return EINVAL; 319 } 320 if (ip->ip_id == 0) 321 ip->ip_id = ip_newid(); 322 /* XXX prevent ip_output from overwriting header fields */ 323 flags |= IP_RAWOUTPUT; 324 ipstat.ips_rawout++; 325 } 326 327 if (inp->inp_flags & INP_ONESBCAST) 328 flags |= IP_SENDONES; 329 330 #ifdef MAC 331 mac_create_mbuf_from_inpcb(inp, m); 332 #endif 333 334 error = ip_output(m, inp->inp_options, NULL, flags, 335 inp->inp_moptions, inp); 336 INP_UNLOCK(inp); 337 return error; 338 } 339 340 /* 341 * Raw IP socket option processing. 342 * 343 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 344 * only be created by a privileged process, and as such, socket option 345 * operations to manage system properties on any raw socket were allowed to 346 * take place without explicit additional access control checks. However, 347 * raw sockets can now also be created in jail(), and therefore explicit 348 * checks are now required. Likewise, raw sockets can be used by a process 349 * after it gives up privilege, so some caution is required. For options 350 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 351 * performed in ip_ctloutput() and therefore no check occurs here. 352 * Unilaterally checking priv_check() here breaks normal IP socket option 353 * operations on raw sockets. 354 * 355 * When adding new socket options here, make sure to add access control 356 * checks here as necessary. 357 */ 358 int 359 rip_ctloutput(struct socket *so, struct sockopt *sopt) 360 { 361 struct inpcb *inp = sotoinpcb(so); 362 int error, optval; 363 364 if (sopt->sopt_level != IPPROTO_IP) 365 return (EINVAL); 366 367 error = 0; 368 switch (sopt->sopt_dir) { 369 case SOPT_GET: 370 switch (sopt->sopt_name) { 371 case IP_HDRINCL: 372 optval = inp->inp_flags & INP_HDRINCL; 373 error = sooptcopyout(sopt, &optval, sizeof optval); 374 break; 375 376 case IP_FW_ADD: /* ADD actually returns the body... */ 377 case IP_FW_GET: 378 case IP_FW_TABLE_GETSIZE: 379 case IP_FW_TABLE_LIST: 380 case IP_FW_NAT_GET_CONFIG: 381 case IP_FW_NAT_GET_LOG: 382 /* 383 * XXXRW: Isn't this checked one layer down? Yes, it 384 * is. 385 */ 386 error = priv_check(curthread, PRIV_NETINET_IPFW); 387 if (error != 0) 388 return (error); 389 if (ip_fw_ctl_ptr != NULL) 390 error = ip_fw_ctl_ptr(sopt); 391 else 392 error = ENOPROTOOPT; 393 break; 394 395 case IP_DUMMYNET_GET: 396 error = priv_check(curthread, PRIV_NETINET_DUMMYNET); 397 if (error != 0) 398 return (error); 399 if (ip_dn_ctl_ptr != NULL) 400 error = ip_dn_ctl_ptr(sopt); 401 else 402 error = ENOPROTOOPT; 403 break ; 404 405 case MRT_INIT: 406 case MRT_DONE: 407 case MRT_ADD_VIF: 408 case MRT_DEL_VIF: 409 case MRT_ADD_MFC: 410 case MRT_DEL_MFC: 411 case MRT_VERSION: 412 case MRT_ASSERT: 413 case MRT_API_SUPPORT: 414 case MRT_API_CONFIG: 415 case MRT_ADD_BW_UPCALL: 416 case MRT_DEL_BW_UPCALL: 417 error = priv_check(curthread, PRIV_NETINET_MROUTE); 418 if (error != 0) 419 return (error); 420 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 421 EOPNOTSUPP; 422 break; 423 424 default: 425 error = ip_ctloutput(so, sopt); 426 break; 427 } 428 break; 429 430 case SOPT_SET: 431 switch (sopt->sopt_name) { 432 case IP_HDRINCL: 433 error = sooptcopyin(sopt, &optval, sizeof optval, 434 sizeof optval); 435 if (error) 436 break; 437 if (optval) 438 inp->inp_flags |= INP_HDRINCL; 439 else 440 inp->inp_flags &= ~INP_HDRINCL; 441 break; 442 443 case IP_FW_ADD: 444 case IP_FW_DEL: 445 case IP_FW_FLUSH: 446 case IP_FW_ZERO: 447 case IP_FW_RESETLOG: 448 case IP_FW_TABLE_ADD: 449 case IP_FW_TABLE_DEL: 450 case IP_FW_TABLE_FLUSH: 451 case IP_FW_NAT_CFG: 452 case IP_FW_NAT_DEL: 453 /* 454 * XXXRW: Isn't this checked one layer down? 455 */ 456 error = priv_check(curthread, PRIV_NETINET_IPFW); 457 if (error != 0) 458 return (error); 459 if (ip_fw_ctl_ptr != NULL) 460 error = ip_fw_ctl_ptr(sopt); 461 else 462 error = ENOPROTOOPT; 463 break; 464 465 case IP_DUMMYNET_CONFIGURE: 466 case IP_DUMMYNET_DEL: 467 case IP_DUMMYNET_FLUSH: 468 error = priv_check(curthread, PRIV_NETINET_DUMMYNET); 469 if (error != 0) 470 return (error); 471 if (ip_dn_ctl_ptr != NULL) 472 error = ip_dn_ctl_ptr(sopt); 473 else 474 error = ENOPROTOOPT ; 475 break ; 476 477 case IP_RSVP_ON: 478 error = priv_check(curthread, PRIV_NETINET_MROUTE); 479 if (error != 0) 480 return (error); 481 error = ip_rsvp_init(so); 482 break; 483 484 case IP_RSVP_OFF: 485 error = priv_check(curthread, PRIV_NETINET_MROUTE); 486 if (error != 0) 487 return (error); 488 error = ip_rsvp_done(); 489 break; 490 491 case IP_RSVP_VIF_ON: 492 case IP_RSVP_VIF_OFF: 493 error = priv_check(curthread, PRIV_NETINET_MROUTE); 494 if (error != 0) 495 return (error); 496 error = ip_rsvp_vif ? 497 ip_rsvp_vif(so, sopt) : EINVAL; 498 break; 499 500 case MRT_INIT: 501 case MRT_DONE: 502 case MRT_ADD_VIF: 503 case MRT_DEL_VIF: 504 case MRT_ADD_MFC: 505 case MRT_DEL_MFC: 506 case MRT_VERSION: 507 case MRT_ASSERT: 508 case MRT_API_SUPPORT: 509 case MRT_API_CONFIG: 510 case MRT_ADD_BW_UPCALL: 511 case MRT_DEL_BW_UPCALL: 512 error = priv_check(curthread, PRIV_NETINET_MROUTE); 513 if (error != 0) 514 return (error); 515 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 516 EOPNOTSUPP; 517 break; 518 519 default: 520 error = ip_ctloutput(so, sopt); 521 break; 522 } 523 break; 524 } 525 526 return (error); 527 } 528 529 /* 530 * This function exists solely to receive the PRC_IFDOWN messages which 531 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 532 * and calls in_ifadown() to remove all routes corresponding to that address. 533 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 534 * interface routes. 535 */ 536 void 537 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 538 { 539 struct in_ifaddr *ia; 540 struct ifnet *ifp; 541 int err; 542 int flags; 543 544 switch (cmd) { 545 case PRC_IFDOWN: 546 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 547 if (ia->ia_ifa.ifa_addr == sa 548 && (ia->ia_flags & IFA_ROUTE)) { 549 /* 550 * in_ifscrub kills the interface route. 551 */ 552 in_ifscrub(ia->ia_ifp, ia); 553 /* 554 * in_ifadown gets rid of all the rest of 555 * the routes. This is not quite the right 556 * thing to do, but at least if we are running 557 * a routing process they will come back. 558 */ 559 in_ifadown(&ia->ia_ifa, 0); 560 break; 561 } 562 } 563 break; 564 565 case PRC_IFUP: 566 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 567 if (ia->ia_ifa.ifa_addr == sa) 568 break; 569 } 570 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 571 return; 572 flags = RTF_UP; 573 ifp = ia->ia_ifa.ifa_ifp; 574 575 if ((ifp->if_flags & IFF_LOOPBACK) 576 || (ifp->if_flags & IFF_POINTOPOINT)) 577 flags |= RTF_HOST; 578 579 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 580 if (err == 0) 581 ia->ia_flags |= IFA_ROUTE; 582 break; 583 } 584 } 585 586 u_long rip_sendspace = 9216; 587 u_long rip_recvspace = 9216; 588 589 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 590 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 591 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 592 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 593 594 static int 595 rip_attach(struct socket *so, int proto, struct thread *td) 596 { 597 struct inpcb *inp; 598 int error; 599 600 inp = sotoinpcb(so); 601 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 602 603 error = priv_check(td, PRIV_NETINET_RAW); 604 if (error) 605 return error; 606 if (proto >= IPPROTO_MAX || proto < 0) 607 return EPROTONOSUPPORT; 608 error = soreserve(so, rip_sendspace, rip_recvspace); 609 if (error) 610 return error; 611 INP_INFO_WLOCK(&ripcbinfo); 612 error = in_pcballoc(so, &ripcbinfo); 613 if (error) { 614 INP_INFO_WUNLOCK(&ripcbinfo); 615 return error; 616 } 617 inp = (struct inpcb *)so->so_pcb; 618 INP_INFO_WUNLOCK(&ripcbinfo); 619 inp->inp_vflag |= INP_IPV4; 620 inp->inp_ip_p = proto; 621 inp->inp_ip_ttl = ip_defttl; 622 INP_UNLOCK(inp); 623 return 0; 624 } 625 626 static void 627 rip_detach(struct socket *so) 628 { 629 struct inpcb *inp; 630 631 inp = sotoinpcb(so); 632 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 633 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 634 ("rip_detach: not closed")); 635 636 INP_INFO_WLOCK(&ripcbinfo); 637 INP_LOCK(inp); 638 if (so == ip_mrouter && ip_mrouter_done) 639 ip_mrouter_done(); 640 if (ip_rsvp_force_done) 641 ip_rsvp_force_done(so); 642 if (so == ip_rsvpd) 643 ip_rsvp_done(); 644 in_pcbdetach(inp); 645 in_pcbfree(inp); 646 INP_INFO_WUNLOCK(&ripcbinfo); 647 } 648 649 static void 650 rip_dodisconnect(struct socket *so, struct inpcb *inp) 651 { 652 653 INP_LOCK_ASSERT(inp); 654 655 inp->inp_faddr.s_addr = INADDR_ANY; 656 SOCK_LOCK(so); 657 so->so_state &= ~SS_ISCONNECTED; 658 SOCK_UNLOCK(so); 659 } 660 661 static void 662 rip_abort(struct socket *so) 663 { 664 struct inpcb *inp; 665 666 inp = sotoinpcb(so); 667 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 668 669 INP_INFO_WLOCK(&ripcbinfo); 670 INP_LOCK(inp); 671 rip_dodisconnect(so, inp); 672 INP_UNLOCK(inp); 673 INP_INFO_WUNLOCK(&ripcbinfo); 674 } 675 676 static void 677 rip_close(struct socket *so) 678 { 679 struct inpcb *inp; 680 681 inp = sotoinpcb(so); 682 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 683 684 INP_INFO_WLOCK(&ripcbinfo); 685 INP_LOCK(inp); 686 rip_dodisconnect(so, inp); 687 INP_UNLOCK(inp); 688 INP_INFO_WUNLOCK(&ripcbinfo); 689 } 690 691 static int 692 rip_disconnect(struct socket *so) 693 { 694 struct inpcb *inp; 695 696 if ((so->so_state & SS_ISCONNECTED) == 0) 697 return ENOTCONN; 698 699 inp = sotoinpcb(so); 700 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 701 INP_INFO_WLOCK(&ripcbinfo); 702 INP_LOCK(inp); 703 rip_dodisconnect(so, inp); 704 INP_UNLOCK(inp); 705 INP_INFO_WUNLOCK(&ripcbinfo); 706 return (0); 707 } 708 709 static int 710 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 711 { 712 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 713 struct inpcb *inp; 714 715 if (nam->sa_len != sizeof(*addr)) 716 return EINVAL; 717 718 if (jailed(td->td_ucred)) { 719 if (addr->sin_addr.s_addr == INADDR_ANY) 720 addr->sin_addr.s_addr = 721 htonl(prison_getip(td->td_ucred)); 722 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 723 return (EADDRNOTAVAIL); 724 } 725 726 if (TAILQ_EMPTY(&ifnet) || 727 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 728 (addr->sin_addr.s_addr && 729 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 730 return EADDRNOTAVAIL; 731 732 inp = sotoinpcb(so); 733 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 734 INP_INFO_WLOCK(&ripcbinfo); 735 INP_LOCK(inp); 736 inp->inp_laddr = addr->sin_addr; 737 INP_UNLOCK(inp); 738 INP_INFO_WUNLOCK(&ripcbinfo); 739 return 0; 740 } 741 742 static int 743 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 744 { 745 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 746 struct inpcb *inp; 747 748 if (nam->sa_len != sizeof(*addr)) 749 return EINVAL; 750 if (TAILQ_EMPTY(&ifnet)) 751 return EADDRNOTAVAIL; 752 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 753 return EAFNOSUPPORT; 754 755 inp = sotoinpcb(so); 756 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 757 INP_INFO_WLOCK(&ripcbinfo); 758 INP_LOCK(inp); 759 inp->inp_faddr = addr->sin_addr; 760 soisconnected(so); 761 INP_UNLOCK(inp); 762 INP_INFO_WUNLOCK(&ripcbinfo); 763 return 0; 764 } 765 766 static int 767 rip_shutdown(struct socket *so) 768 { 769 struct inpcb *inp; 770 771 inp = sotoinpcb(so); 772 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 773 INP_LOCK(inp); 774 socantsendmore(so); 775 INP_UNLOCK(inp); 776 return 0; 777 } 778 779 static int 780 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 781 struct mbuf *control, struct thread *td) 782 { 783 struct inpcb *inp; 784 u_long dst; 785 786 inp = sotoinpcb(so); 787 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 788 /* 789 * Note: 'dst' reads below are unlocked. 790 */ 791 if (so->so_state & SS_ISCONNECTED) { 792 if (nam) { 793 m_freem(m); 794 return EISCONN; 795 } 796 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 797 } else { 798 if (nam == NULL) { 799 m_freem(m); 800 return ENOTCONN; 801 } 802 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 803 } 804 return rip_output(m, so, dst); 805 } 806 807 static int 808 rip_pcblist(SYSCTL_HANDLER_ARGS) 809 { 810 int error, i, n; 811 struct inpcb *inp, **inp_list; 812 inp_gen_t gencnt; 813 struct xinpgen xig; 814 815 /* 816 * The process of preparing the TCB list is too time-consuming and 817 * resource-intensive to repeat twice on every request. 818 */ 819 if (req->oldptr == 0) { 820 n = ripcbinfo.ipi_count; 821 req->oldidx = 2 * (sizeof xig) 822 + (n + n/8) * sizeof(struct xinpcb); 823 return 0; 824 } 825 826 if (req->newptr != 0) 827 return EPERM; 828 829 /* 830 * OK, now we're committed to doing something. 831 */ 832 INP_INFO_RLOCK(&ripcbinfo); 833 gencnt = ripcbinfo.ipi_gencnt; 834 n = ripcbinfo.ipi_count; 835 INP_INFO_RUNLOCK(&ripcbinfo); 836 837 xig.xig_len = sizeof xig; 838 xig.xig_count = n; 839 xig.xig_gen = gencnt; 840 xig.xig_sogen = so_gencnt; 841 error = SYSCTL_OUT(req, &xig, sizeof xig); 842 if (error) 843 return error; 844 845 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 846 if (inp_list == 0) 847 return ENOMEM; 848 849 INP_INFO_RLOCK(&ripcbinfo); 850 for (inp = LIST_FIRST(ripcbinfo.ipi_listhead), i = 0; inp && i < n; 851 inp = LIST_NEXT(inp, inp_list)) { 852 INP_LOCK(inp); 853 if (inp->inp_gencnt <= gencnt && 854 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 855 /* XXX held references? */ 856 inp_list[i++] = inp; 857 } 858 INP_UNLOCK(inp); 859 } 860 INP_INFO_RUNLOCK(&ripcbinfo); 861 n = i; 862 863 error = 0; 864 for (i = 0; i < n; i++) { 865 inp = inp_list[i]; 866 INP_LOCK(inp); 867 if (inp->inp_gencnt <= gencnt) { 868 struct xinpcb xi; 869 bzero(&xi, sizeof(xi)); 870 xi.xi_len = sizeof xi; 871 /* XXX should avoid extra copy */ 872 bcopy(inp, &xi.xi_inp, sizeof *inp); 873 if (inp->inp_socket) 874 sotoxsocket(inp->inp_socket, &xi.xi_socket); 875 INP_UNLOCK(inp); 876 error = SYSCTL_OUT(req, &xi, sizeof xi); 877 } else 878 INP_UNLOCK(inp); 879 } 880 if (!error) { 881 /* 882 * Give the user an updated idea of our state. 883 * If the generation differs from what we told 884 * her before, she knows that something happened 885 * while we were processing this request, and it 886 * might be necessary to retry. 887 */ 888 INP_INFO_RLOCK(&ripcbinfo); 889 xig.xig_gen = ripcbinfo.ipi_gencnt; 890 xig.xig_sogen = so_gencnt; 891 xig.xig_count = ripcbinfo.ipi_count; 892 INP_INFO_RUNLOCK(&ripcbinfo); 893 error = SYSCTL_OUT(req, &xig, sizeof xig); 894 } 895 free(inp_list, M_TEMP); 896 return error; 897 } 898 899 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 900 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 901 902 struct pr_usrreqs rip_usrreqs = { 903 .pru_abort = rip_abort, 904 .pru_attach = rip_attach, 905 .pru_bind = rip_bind, 906 .pru_connect = rip_connect, 907 .pru_control = in_control, 908 .pru_detach = rip_detach, 909 .pru_disconnect = rip_disconnect, 910 .pru_peeraddr = in_getpeeraddr, 911 .pru_send = rip_send, 912 .pru_shutdown = rip_shutdown, 913 .pru_sockaddr = in_getsockaddr, 914 .pru_sosetlabel = in_pcbsosetlabel, 915 .pru_close = rip_close, 916 }; 917