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 #include "opt_random_ip_id.h" 37 38 #include <sys/param.h> 39 #include <sys/jail.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/mac.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/proc.h> 46 #include <sys/protosw.h> 47 #include <sys/signalvar.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/sx.h> 51 #include <sys/sysctl.h> 52 #include <sys/systm.h> 53 54 #include <vm/uma.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/in_pcb.h> 62 #include <netinet/in_var.h> 63 #include <netinet/ip.h> 64 #include <netinet/ip_var.h> 65 #include <netinet/ip_mroute.h> 66 67 #include <netinet/ip_fw.h> 68 #include <netinet/ip_dummynet.h> 69 70 #ifdef FAST_IPSEC 71 #include <netipsec/ipsec.h> 72 #endif /*FAST_IPSEC*/ 73 74 #ifdef IPSEC 75 #include <netinet6/ipsec.h> 76 #endif /*IPSEC*/ 77 78 struct inpcbhead ripcb; 79 struct inpcbinfo ripcbinfo; 80 81 /* control hooks for ipfw and dummynet */ 82 ip_fw_ctl_t *ip_fw_ctl_ptr; 83 ip_dn_ctl_t *ip_dn_ctl_ptr; 84 85 /* 86 * hooks for multicast routing. They all default to NULL, 87 * so leave them not initialized and rely on BSS being set to 0. 88 */ 89 90 /* The socket used to communicate with the multicast routing daemon. */ 91 struct socket *ip_mrouter; 92 93 /* The various mrouter and rsvp functions */ 94 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 95 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 96 int (*ip_mrouter_done)(void); 97 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 98 struct ip_moptions *); 99 int (*mrt_ioctl)(int, caddr_t); 100 int (*legal_vif_num)(int); 101 u_long (*ip_mcast_src)(int); 102 103 void (*rsvp_input_p)(struct mbuf *m, int off); 104 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 105 void (*ip_rsvp_force_done)(struct socket *); 106 107 /* 108 * Nominal space allocated to a raw ip socket. 109 */ 110 #define RIPSNDQ 8192 111 #define RIPRCVQ 8192 112 113 /* 114 * Raw interface to IP protocol. 115 */ 116 117 /* 118 * Initialize raw connection block q. 119 */ 120 void 121 rip_init() 122 { 123 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 124 LIST_INIT(&ripcb); 125 ripcbinfo.listhead = &ripcb; 126 /* 127 * XXX We don't use the hash list for raw IP, but it's easier 128 * to allocate a one entry hash list than it is to check all 129 * over the place for hashbase == NULL. 130 */ 131 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 132 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask); 133 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 134 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 135 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 136 } 137 138 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 139 140 static int 141 raw_append(struct inpcb *last, struct ip *ip, struct mbuf *n) 142 { 143 int policyfail = 0; 144 145 INP_LOCK_ASSERT(last); 146 147 #if defined(IPSEC) || defined(FAST_IPSEC) 148 /* check AH/ESP integrity. */ 149 if (ipsec4_in_reject(n, last)) { 150 policyfail = 1; 151 #ifdef IPSEC 152 ipsecstat.in_polvio++; 153 #endif /*IPSEC*/ 154 /* do not inject data to pcb */ 155 } 156 #endif /*IPSEC || FAST_IPSEC*/ 157 #ifdef MAC 158 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 159 policyfail = 1; 160 #endif 161 if (!policyfail) { 162 struct mbuf *opts = NULL; 163 struct socket *so; 164 165 so = last->inp_socket; 166 if ((last->inp_flags & INP_CONTROLOPTS) || 167 (so->so_options & SO_TIMESTAMP)) 168 ip_savecontrol(last, &opts, ip, n); 169 SOCKBUF_LOCK(&so->so_rcv); 170 if (sbappendaddr_locked(&so->so_rcv, 171 (struct sockaddr *)&ripsrc, n, opts) == 0) { 172 /* should notify about lost packet */ 173 m_freem(n); 174 if (opts) 175 m_freem(opts); 176 SOCKBUF_UNLOCK(&so->so_rcv); 177 } else 178 sorwakeup_locked(so); 179 } else 180 m_freem(n); 181 return policyfail; 182 } 183 184 /* 185 * Setup generic address and protocol structures 186 * for raw_input routine, then pass them along with 187 * mbuf chain. 188 */ 189 void 190 rip_input(struct mbuf *m, int off) 191 { 192 struct ip *ip = mtod(m, struct ip *); 193 int proto = ip->ip_p; 194 struct inpcb *inp, *last; 195 196 INP_INFO_RLOCK(&ripcbinfo); 197 ripsrc.sin_addr = ip->ip_src; 198 last = NULL; 199 LIST_FOREACH(inp, &ripcb, inp_list) { 200 INP_LOCK(inp); 201 if (inp->inp_ip_p && inp->inp_ip_p != proto) { 202 docontinue: 203 INP_UNLOCK(inp); 204 continue; 205 } 206 #ifdef INET6 207 if ((inp->inp_vflag & INP_IPV4) == 0) 208 goto docontinue; 209 #endif 210 if (inp->inp_laddr.s_addr && 211 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 212 goto docontinue; 213 if (inp->inp_faddr.s_addr && 214 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 215 goto docontinue; 216 if (jailed(inp->inp_socket->so_cred)) 217 if (htonl(prison_getip(inp->inp_socket->so_cred)) != 218 ip->ip_dst.s_addr) 219 goto docontinue; 220 if (last) { 221 struct mbuf *n; 222 223 n = m_copy(m, 0, (int)M_COPYALL); 224 if (n != NULL) 225 (void) raw_append(last, ip, n); 226 /* XXX count dropped packet */ 227 INP_UNLOCK(last); 228 } 229 last = inp; 230 } 231 if (last != NULL) { 232 if (raw_append(last, ip, m) != 0) 233 ipstat.ips_delivered--; 234 INP_UNLOCK(last); 235 } else { 236 m_freem(m); 237 ipstat.ips_noproto++; 238 ipstat.ips_delivered--; 239 } 240 INP_INFO_RUNLOCK(&ripcbinfo); 241 } 242 243 /* 244 * Generate IP header and pass packet to ip_output. 245 * Tack on options user may have setup with control call. 246 */ 247 int 248 rip_output(struct mbuf *m, struct socket *so, u_long dst) 249 { 250 struct ip *ip; 251 int error; 252 struct inpcb *inp = sotoinpcb(so); 253 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 254 255 /* 256 * If the user handed us a complete IP packet, use it. 257 * Otherwise, allocate an mbuf for a header and fill it in. 258 */ 259 if ((inp->inp_flags & INP_HDRINCL) == 0) { 260 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 261 m_freem(m); 262 return(EMSGSIZE); 263 } 264 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 265 if (m == NULL) 266 return(ENOBUFS); 267 268 INP_LOCK(inp); 269 ip = mtod(m, struct ip *); 270 ip->ip_tos = inp->inp_ip_tos; 271 ip->ip_off = 0; 272 ip->ip_p = inp->inp_ip_p; 273 ip->ip_len = m->m_pkthdr.len; 274 if (jailed(inp->inp_socket->so_cred)) 275 ip->ip_src.s_addr = 276 htonl(prison_getip(inp->inp_socket->so_cred)); 277 else 278 ip->ip_src = inp->inp_laddr; 279 ip->ip_dst.s_addr = dst; 280 ip->ip_ttl = inp->inp_ip_ttl; 281 } else { 282 if (m->m_pkthdr.len > IP_MAXPACKET) { 283 m_freem(m); 284 return(EMSGSIZE); 285 } 286 INP_LOCK(inp); 287 ip = mtod(m, struct ip *); 288 if (jailed(inp->inp_socket->so_cred)) { 289 if (ip->ip_src.s_addr != 290 htonl(prison_getip(inp->inp_socket->so_cred))) { 291 INP_UNLOCK(inp); 292 m_freem(m); 293 return (EPERM); 294 } 295 } 296 /* don't allow both user specified and setsockopt options, 297 and don't allow packet length sizes that will crash */ 298 if (((ip->ip_hl != (sizeof (*ip) >> 2)) 299 && inp->inp_options) 300 || (ip->ip_len > m->m_pkthdr.len) 301 || (ip->ip_len < (ip->ip_hl << 2))) { 302 INP_UNLOCK(inp); 303 m_freem(m); 304 return EINVAL; 305 } 306 if (ip->ip_id == 0) 307 #ifdef RANDOM_IP_ID 308 ip->ip_id = ip_randomid(); 309 #else 310 ip->ip_id = htons(ip_id++); 311 #endif 312 /* XXX prevent ip_output from overwriting header fields */ 313 flags |= IP_RAWOUTPUT; 314 ipstat.ips_rawout++; 315 } 316 317 if (inp->inp_flags & INP_ONESBCAST) 318 flags |= IP_SENDONES; 319 320 #ifdef MAC 321 mac_create_mbuf_from_inpcb(inp, m); 322 #endif 323 324 error = ip_output(m, inp->inp_options, NULL, flags, 325 inp->inp_moptions, inp); 326 INP_UNLOCK(inp); 327 return error; 328 } 329 330 /* 331 * Raw IP socket option processing. 332 * 333 * Note that access to all of the IP administrative functions here is 334 * implicitly protected by suser() as gaining access to a raw socket 335 * requires either that the thread pass a suser() check, or that it be 336 * passed a raw socket by another thread that has passed a suser() check. 337 * If FreeBSD moves to a more fine-grained access control mechanism, 338 * additional checks will need to be placed here if the raw IP attachment 339 * check is not equivilent the the check required for these 340 * administrative operations; in some cases, these checks are already 341 * present. 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; 353 354 switch (sopt->sopt_dir) { 355 case SOPT_GET: 356 switch (sopt->sopt_name) { 357 case IP_HDRINCL: 358 optval = inp->inp_flags & INP_HDRINCL; 359 error = sooptcopyout(sopt, &optval, sizeof optval); 360 break; 361 362 case IP_FW_ADD: /* ADD actually returns the body... */ 363 case IP_FW_GET: 364 case IP_FW_TABLE_GETSIZE: 365 case IP_FW_TABLE_LIST: 366 if (IPFW_LOADED) 367 error = ip_fw_ctl_ptr(sopt); 368 else 369 error = ENOPROTOOPT; 370 break; 371 372 case IP_DUMMYNET_GET: 373 if (DUMMYNET_LOADED) 374 error = ip_dn_ctl_ptr(sopt); 375 else 376 error = ENOPROTOOPT; 377 break ; 378 379 case MRT_INIT: 380 case MRT_DONE: 381 case MRT_ADD_VIF: 382 case MRT_DEL_VIF: 383 case MRT_ADD_MFC: 384 case MRT_DEL_MFC: 385 case MRT_VERSION: 386 case MRT_ASSERT: 387 case MRT_API_SUPPORT: 388 case MRT_API_CONFIG: 389 case MRT_ADD_BW_UPCALL: 390 case MRT_DEL_BW_UPCALL: 391 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 392 EOPNOTSUPP; 393 break; 394 395 default: 396 error = ip_ctloutput(so, sopt); 397 break; 398 } 399 break; 400 401 case SOPT_SET: 402 switch (sopt->sopt_name) { 403 case IP_HDRINCL: 404 error = sooptcopyin(sopt, &optval, sizeof optval, 405 sizeof optval); 406 if (error) 407 break; 408 if (optval) 409 inp->inp_flags |= INP_HDRINCL; 410 else 411 inp->inp_flags &= ~INP_HDRINCL; 412 break; 413 414 case IP_FW_ADD: 415 case IP_FW_DEL: 416 case IP_FW_FLUSH: 417 case IP_FW_ZERO: 418 case IP_FW_RESETLOG: 419 case IP_FW_TABLE_ADD: 420 case IP_FW_TABLE_DEL: 421 case IP_FW_TABLE_FLUSH: 422 if (IPFW_LOADED) 423 error = ip_fw_ctl_ptr(sopt); 424 else 425 error = ENOPROTOOPT; 426 break; 427 428 case IP_DUMMYNET_CONFIGURE: 429 case IP_DUMMYNET_DEL: 430 case IP_DUMMYNET_FLUSH: 431 if (DUMMYNET_LOADED) 432 error = ip_dn_ctl_ptr(sopt); 433 else 434 error = ENOPROTOOPT ; 435 break ; 436 437 case IP_RSVP_ON: 438 error = ip_rsvp_init(so); 439 break; 440 441 case IP_RSVP_OFF: 442 error = ip_rsvp_done(); 443 break; 444 445 case IP_RSVP_VIF_ON: 446 case IP_RSVP_VIF_OFF: 447 error = ip_rsvp_vif ? 448 ip_rsvp_vif(so, sopt) : EINVAL; 449 break; 450 451 case MRT_INIT: 452 case MRT_DONE: 453 case MRT_ADD_VIF: 454 case MRT_DEL_VIF: 455 case MRT_ADD_MFC: 456 case MRT_DEL_MFC: 457 case MRT_VERSION: 458 case MRT_ASSERT: 459 case MRT_API_SUPPORT: 460 case MRT_API_CONFIG: 461 case MRT_ADD_BW_UPCALL: 462 case MRT_DEL_BW_UPCALL: 463 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 464 EOPNOTSUPP; 465 break; 466 467 default: 468 error = ip_ctloutput(so, sopt); 469 break; 470 } 471 break; 472 } 473 474 return (error); 475 } 476 477 /* 478 * This function exists solely to receive the PRC_IFDOWN messages which 479 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 480 * and calls in_ifadown() to remove all routes corresponding to that address. 481 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 482 * interface routes. 483 */ 484 void 485 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 486 { 487 struct in_ifaddr *ia; 488 struct ifnet *ifp; 489 int err; 490 int flags; 491 492 switch (cmd) { 493 case PRC_IFDOWN: 494 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 495 if (ia->ia_ifa.ifa_addr == sa 496 && (ia->ia_flags & IFA_ROUTE)) { 497 /* 498 * in_ifscrub kills the interface route. 499 */ 500 in_ifscrub(ia->ia_ifp, ia); 501 /* 502 * in_ifadown gets rid of all the rest of 503 * the routes. This is not quite the right 504 * thing to do, but at least if we are running 505 * a routing process they will come back. 506 */ 507 in_ifadown(&ia->ia_ifa, 0); 508 break; 509 } 510 } 511 break; 512 513 case PRC_IFUP: 514 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 515 if (ia->ia_ifa.ifa_addr == sa) 516 break; 517 } 518 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 519 return; 520 flags = RTF_UP; 521 ifp = ia->ia_ifa.ifa_ifp; 522 523 if ((ifp->if_flags & IFF_LOOPBACK) 524 || (ifp->if_flags & IFF_POINTOPOINT)) 525 flags |= RTF_HOST; 526 527 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 528 if (err == 0) 529 ia->ia_flags |= IFA_ROUTE; 530 break; 531 } 532 } 533 534 u_long rip_sendspace = RIPSNDQ; 535 u_long rip_recvspace = RIPRCVQ; 536 537 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 538 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 539 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 540 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 541 542 static int 543 rip_attach(struct socket *so, int proto, struct thread *td) 544 { 545 struct inpcb *inp; 546 int error; 547 548 /* XXX why not lower? */ 549 INP_INFO_WLOCK(&ripcbinfo); 550 inp = sotoinpcb(so); 551 if (inp) { 552 /* XXX counter, printf */ 553 INP_INFO_WUNLOCK(&ripcbinfo); 554 return EINVAL; 555 } 556 if (td && jailed(td->td_ucred) && !jail_allow_raw_sockets) { 557 INP_INFO_WUNLOCK(&ripcbinfo); 558 return (EPERM); 559 } 560 if (td && (error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL)) != 0) { 561 INP_INFO_WUNLOCK(&ripcbinfo); 562 return error; 563 } 564 if (proto >= IPPROTO_MAX || proto < 0) { 565 INP_INFO_WUNLOCK(&ripcbinfo); 566 return EPROTONOSUPPORT; 567 } 568 569 error = soreserve(so, rip_sendspace, rip_recvspace); 570 if (error) { 571 INP_INFO_WUNLOCK(&ripcbinfo); 572 return error; 573 } 574 error = in_pcballoc(so, &ripcbinfo, "rawinp"); 575 if (error) { 576 INP_INFO_WUNLOCK(&ripcbinfo); 577 return error; 578 } 579 inp = (struct inpcb *)so->so_pcb; 580 INP_LOCK(inp); 581 INP_INFO_WUNLOCK(&ripcbinfo); 582 inp->inp_vflag |= INP_IPV4; 583 inp->inp_ip_p = proto; 584 inp->inp_ip_ttl = ip_defttl; 585 INP_UNLOCK(inp); 586 return 0; 587 } 588 589 static void 590 rip_pcbdetach(struct socket *so, struct inpcb *inp) 591 { 592 INP_INFO_WLOCK_ASSERT(&ripcbinfo); 593 INP_LOCK_ASSERT(inp); 594 595 if (so == ip_mrouter && ip_mrouter_done) 596 ip_mrouter_done(); 597 if (ip_rsvp_force_done) 598 ip_rsvp_force_done(so); 599 if (so == ip_rsvpd) 600 ip_rsvp_done(); 601 in_pcbdetach(inp); 602 } 603 604 static int 605 rip_detach(struct socket *so) 606 { 607 struct inpcb *inp; 608 609 INP_INFO_WLOCK(&ripcbinfo); 610 inp = sotoinpcb(so); 611 if (inp == 0) { 612 /* XXX counter, printf */ 613 INP_INFO_WUNLOCK(&ripcbinfo); 614 return EINVAL; 615 } 616 INP_LOCK(inp); 617 rip_pcbdetach(so, inp); 618 INP_INFO_WUNLOCK(&ripcbinfo); 619 return 0; 620 } 621 622 static int 623 rip_abort(struct socket *so) 624 { 625 struct inpcb *inp; 626 627 INP_INFO_WLOCK(&ripcbinfo); 628 inp = sotoinpcb(so); 629 if (inp == 0) { 630 INP_INFO_WUNLOCK(&ripcbinfo); 631 return EINVAL; /* ??? possible? panic instead? */ 632 } 633 INP_LOCK(inp); 634 soisdisconnected(so); 635 if (so->so_state & SS_NOFDREF) 636 rip_pcbdetach(so, inp); 637 else 638 INP_UNLOCK(inp); 639 INP_INFO_WUNLOCK(&ripcbinfo); 640 return 0; 641 } 642 643 static int 644 rip_disconnect(struct socket *so) 645 { 646 if ((so->so_state & SS_ISCONNECTED) == 0) 647 return ENOTCONN; 648 return rip_abort(so); 649 } 650 651 static int 652 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 653 { 654 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 655 struct inpcb *inp; 656 657 if (nam->sa_len != sizeof(*addr)) 658 return EINVAL; 659 660 if (jailed(td->td_ucred)) { 661 if (addr->sin_addr.s_addr == INADDR_ANY) 662 addr->sin_addr.s_addr = 663 htonl(prison_getip(td->td_ucred)); 664 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 665 return (EADDRNOTAVAIL); 666 } 667 668 if (TAILQ_EMPTY(&ifnet) || 669 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 670 (addr->sin_addr.s_addr && 671 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 672 return EADDRNOTAVAIL; 673 674 INP_INFO_WLOCK(&ripcbinfo); 675 inp = sotoinpcb(so); 676 if (inp == 0) { 677 INP_INFO_WUNLOCK(&ripcbinfo); 678 return EINVAL; 679 } 680 INP_LOCK(inp); 681 inp->inp_laddr = addr->sin_addr; 682 INP_UNLOCK(inp); 683 INP_INFO_WUNLOCK(&ripcbinfo); 684 return 0; 685 } 686 687 static int 688 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 689 { 690 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 691 struct inpcb *inp; 692 693 if (nam->sa_len != sizeof(*addr)) 694 return EINVAL; 695 if (TAILQ_EMPTY(&ifnet)) 696 return EADDRNOTAVAIL; 697 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 698 return EAFNOSUPPORT; 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_faddr = addr->sin_addr; 708 soisconnected(so); 709 INP_UNLOCK(inp); 710 INP_INFO_WUNLOCK(&ripcbinfo); 711 return 0; 712 } 713 714 static int 715 rip_shutdown(struct socket *so) 716 { 717 struct inpcb *inp; 718 719 INP_INFO_RLOCK(&ripcbinfo); 720 inp = sotoinpcb(so); 721 if (inp == 0) { 722 INP_INFO_RUNLOCK(&ripcbinfo); 723 return EINVAL; 724 } 725 INP_LOCK(inp); 726 INP_INFO_RUNLOCK(&ripcbinfo); 727 socantsendmore(so); 728 INP_UNLOCK(inp); 729 return 0; 730 } 731 732 static int 733 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 734 struct mbuf *control, struct thread *td) 735 { 736 struct inpcb *inp; 737 u_long dst; 738 int ret; 739 740 INP_INFO_WLOCK(&ripcbinfo); 741 inp = sotoinpcb(so); 742 if (so->so_state & SS_ISCONNECTED) { 743 if (nam) { 744 INP_INFO_WUNLOCK(&ripcbinfo); 745 m_freem(m); 746 return EISCONN; 747 } 748 dst = inp->inp_faddr.s_addr; 749 } else { 750 if (nam == NULL) { 751 INP_INFO_WUNLOCK(&ripcbinfo); 752 m_freem(m); 753 return ENOTCONN; 754 } 755 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 756 } 757 ret = rip_output(m, so, dst); 758 INP_INFO_WUNLOCK(&ripcbinfo); 759 return ret; 760 } 761 762 static int 763 rip_pcblist(SYSCTL_HANDLER_ARGS) 764 { 765 int error, i, n; 766 struct inpcb *inp, **inp_list; 767 inp_gen_t gencnt; 768 struct xinpgen xig; 769 770 /* 771 * The process of preparing the TCB list is too time-consuming and 772 * resource-intensive to repeat twice on every request. 773 */ 774 if (req->oldptr == 0) { 775 n = ripcbinfo.ipi_count; 776 req->oldidx = 2 * (sizeof xig) 777 + (n + n/8) * sizeof(struct xinpcb); 778 return 0; 779 } 780 781 if (req->newptr != 0) 782 return EPERM; 783 784 /* 785 * OK, now we're committed to doing something. 786 */ 787 INP_INFO_RLOCK(&ripcbinfo); 788 gencnt = ripcbinfo.ipi_gencnt; 789 n = ripcbinfo.ipi_count; 790 INP_INFO_RUNLOCK(&ripcbinfo); 791 792 xig.xig_len = sizeof xig; 793 xig.xig_count = n; 794 xig.xig_gen = gencnt; 795 xig.xig_sogen = so_gencnt; 796 error = SYSCTL_OUT(req, &xig, sizeof xig); 797 if (error) 798 return error; 799 800 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 801 if (inp_list == 0) 802 return ENOMEM; 803 804 INP_INFO_RLOCK(&ripcbinfo); 805 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n; 806 inp = LIST_NEXT(inp, inp_list)) { 807 INP_LOCK(inp); 808 if (inp->inp_gencnt <= gencnt && 809 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 810 /* XXX held references? */ 811 inp_list[i++] = inp; 812 } 813 INP_UNLOCK(inp); 814 } 815 INP_INFO_RUNLOCK(&ripcbinfo); 816 n = i; 817 818 error = 0; 819 for (i = 0; i < n; i++) { 820 inp = inp_list[i]; 821 if (inp->inp_gencnt <= gencnt) { 822 struct xinpcb xi; 823 xi.xi_len = sizeof xi; 824 /* XXX should avoid extra copy */ 825 bcopy(inp, &xi.xi_inp, sizeof *inp); 826 if (inp->inp_socket) 827 sotoxsocket(inp->inp_socket, &xi.xi_socket); 828 error = SYSCTL_OUT(req, &xi, sizeof xi); 829 } 830 } 831 if (!error) { 832 /* 833 * Give the user an updated idea of our state. 834 * If the generation differs from what we told 835 * her before, she knows that something happened 836 * while we were processing this request, and it 837 * might be necessary to retry. 838 */ 839 INP_INFO_RLOCK(&ripcbinfo); 840 xig.xig_gen = ripcbinfo.ipi_gencnt; 841 xig.xig_sogen = so_gencnt; 842 xig.xig_count = ripcbinfo.ipi_count; 843 INP_INFO_RUNLOCK(&ripcbinfo); 844 error = SYSCTL_OUT(req, &xig, sizeof xig); 845 } 846 free(inp_list, M_TEMP); 847 return error; 848 } 849 850 /* 851 * This is the wrapper function for in_setsockaddr. We just pass down 852 * the pcbinfo for in_setpeeraddr to lock. 853 */ 854 static int 855 rip_sockaddr(struct socket *so, struct sockaddr **nam) 856 { 857 return (in_setsockaddr(so, nam, &ripcbinfo)); 858 } 859 860 /* 861 * This is the wrapper function for in_setpeeraddr. We just pass down 862 * the pcbinfo for in_setpeeraddr to lock. 863 */ 864 static int 865 rip_peeraddr(struct socket *so, struct sockaddr **nam) 866 { 867 return (in_setpeeraddr(so, nam, &ripcbinfo)); 868 } 869 870 871 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 872 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 873 874 struct pr_usrreqs rip_usrreqs = { 875 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 876 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 877 pru_listen_notsupp, rip_peeraddr, pru_rcvd_notsupp, 878 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 879 rip_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 880 }; 881