raw_ip.c revision 157370
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: head/sys/netinet/raw_ip.c 157370 2006-04-01 15:42:02Z rwatson $ 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 77struct inpcbhead ripcb; 78struct inpcbinfo ripcbinfo; 79 80/* control hooks for ipfw and dummynet */ 81ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 82ip_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. */ 90struct socket *ip_mrouter; 91 92/* The various mrouter and rsvp functions */ 93int (*ip_mrouter_set)(struct socket *, struct sockopt *); 94int (*ip_mrouter_get)(struct socket *, struct sockopt *); 95int (*ip_mrouter_done)(void); 96int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 97 struct ip_moptions *); 98int (*mrt_ioctl)(int, caddr_t); 99int (*legal_vif_num)(int); 100u_long (*ip_mcast_src)(int); 101 102void (*rsvp_input_p)(struct mbuf *m, int off); 103int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 104void (*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 */ 119void 120rip_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 137static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 138 139static int 140raw_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 /* Check the minimum TTL for socket. */ 161 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 162 policyfail = 1; 163 if (!policyfail) { 164 struct mbuf *opts = NULL; 165 struct socket *so; 166 167 so = last->inp_socket; 168 if ((last->inp_flags & INP_CONTROLOPTS) || 169 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 170 ip_savecontrol(last, &opts, ip, n); 171 SOCKBUF_LOCK(&so->so_rcv); 172 if (sbappendaddr_locked(&so->so_rcv, 173 (struct sockaddr *)&ripsrc, n, opts) == 0) { 174 /* should notify about lost packet */ 175 m_freem(n); 176 if (opts) 177 m_freem(opts); 178 SOCKBUF_UNLOCK(&so->so_rcv); 179 } else 180 sorwakeup_locked(so); 181 } else 182 m_freem(n); 183 return policyfail; 184} 185 186/* 187 * Setup generic address and protocol structures 188 * for raw_input routine, then pass them along with 189 * mbuf chain. 190 */ 191void 192rip_input(struct mbuf *m, int off) 193{ 194 struct ip *ip = mtod(m, struct ip *); 195 int proto = ip->ip_p; 196 struct inpcb *inp, *last; 197 198 INP_INFO_RLOCK(&ripcbinfo); 199 ripsrc.sin_addr = ip->ip_src; 200 last = NULL; 201 LIST_FOREACH(inp, &ripcb, inp_list) { 202 INP_LOCK(inp); 203 if (inp->inp_ip_p && inp->inp_ip_p != proto) { 204 docontinue: 205 INP_UNLOCK(inp); 206 continue; 207 } 208#ifdef INET6 209 if ((inp->inp_vflag & INP_IPV4) == 0) 210 goto docontinue; 211#endif 212 if (inp->inp_laddr.s_addr && 213 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 214 goto docontinue; 215 if (inp->inp_faddr.s_addr && 216 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 217 goto docontinue; 218 if (jailed(inp->inp_socket->so_cred)) 219 if (htonl(prison_getip(inp->inp_socket->so_cred)) != 220 ip->ip_dst.s_addr) 221 goto docontinue; 222 if (last) { 223 struct mbuf *n; 224 225 n = m_copy(m, 0, (int)M_COPYALL); 226 if (n != NULL) 227 (void) raw_append(last, ip, n); 228 /* XXX count dropped packet */ 229 INP_UNLOCK(last); 230 } 231 last = inp; 232 } 233 if (last != NULL) { 234 if (raw_append(last, ip, m) != 0) 235 ipstat.ips_delivered--; 236 INP_UNLOCK(last); 237 } else { 238 m_freem(m); 239 ipstat.ips_noproto++; 240 ipstat.ips_delivered--; 241 } 242 INP_INFO_RUNLOCK(&ripcbinfo); 243} 244 245/* 246 * Generate IP header and pass packet to ip_output. 247 * Tack on options user may have setup with control call. 248 */ 249int 250rip_output(struct mbuf *m, struct socket *so, u_long dst) 251{ 252 struct ip *ip; 253 int error; 254 struct inpcb *inp = sotoinpcb(so); 255 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 256 IP_ALLOWBROADCAST; 257 258 /* 259 * If the user handed us a complete IP packet, use it. 260 * Otherwise, allocate an mbuf for a header and fill it in. 261 */ 262 if ((inp->inp_flags & INP_HDRINCL) == 0) { 263 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 264 m_freem(m); 265 return(EMSGSIZE); 266 } 267 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 268 if (m == NULL) 269 return(ENOBUFS); 270 271 INP_LOCK(inp); 272 ip = mtod(m, struct ip *); 273 ip->ip_tos = inp->inp_ip_tos; 274 if (inp->inp_flags & INP_DONTFRAG) 275 ip->ip_off = IP_DF; 276 else 277 ip->ip_off = 0; 278 ip->ip_p = inp->inp_ip_p; 279 ip->ip_len = m->m_pkthdr.len; 280 if (jailed(inp->inp_socket->so_cred)) 281 ip->ip_src.s_addr = 282 htonl(prison_getip(inp->inp_socket->so_cred)); 283 else 284 ip->ip_src = inp->inp_laddr; 285 ip->ip_dst.s_addr = dst; 286 ip->ip_ttl = inp->inp_ip_ttl; 287 } else { 288 if (m->m_pkthdr.len > IP_MAXPACKET) { 289 m_freem(m); 290 return(EMSGSIZE); 291 } 292 INP_LOCK(inp); 293 ip = mtod(m, struct ip *); 294 if (jailed(inp->inp_socket->so_cred)) { 295 if (ip->ip_src.s_addr != 296 htonl(prison_getip(inp->inp_socket->so_cred))) { 297 INP_UNLOCK(inp); 298 m_freem(m); 299 return (EPERM); 300 } 301 } 302 /* don't allow both user specified and setsockopt options, 303 and don't allow packet length sizes that will crash */ 304 if (((ip->ip_hl != (sizeof (*ip) >> 2)) 305 && inp->inp_options) 306 || (ip->ip_len > m->m_pkthdr.len) 307 || (ip->ip_len < (ip->ip_hl << 2))) { 308 INP_UNLOCK(inp); 309 m_freem(m); 310 return EINVAL; 311 } 312 if (ip->ip_id == 0) 313 ip->ip_id = ip_newid(); 314 /* XXX prevent ip_output from overwriting header fields */ 315 flags |= IP_RAWOUTPUT; 316 ipstat.ips_rawout++; 317 } 318 319 if (inp->inp_vflag & INP_ONESBCAST) 320 flags |= IP_SENDONES; 321 322#ifdef MAC 323 mac_create_mbuf_from_inpcb(inp, m); 324#endif 325 326 error = ip_output(m, inp->inp_options, NULL, flags, 327 inp->inp_moptions, inp); 328 INP_UNLOCK(inp); 329 return error; 330} 331 332/* 333 * Raw IP socket option processing. 334 * 335 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 336 * only be created by a privileged process, and as such, socket option 337 * operations to manage system properties on any raw socket were allowed to 338 * take place without explicit additional access control checks. However, 339 * raw sockets can now also be created in jail(), and therefore explicit 340 * checks are now required. Likewise, raw sockets can be used by a process 341 * after it gives up privilege, so some caution is required. For options 342 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 343 * performed in ip_ctloutput() and therefore no check occurs here. 344 * Unilaterally checking suser() here breaks normal IP socket option 345 * operations on raw sockets. 346 * 347 * When adding new socket options here, make sure to add access control 348 * checks here as necessary. 349 */ 350int 351rip_ctloutput(struct socket *so, struct sockopt *sopt) 352{ 353 struct inpcb *inp = sotoinpcb(so); 354 int error, optval; 355 356 if (sopt->sopt_level != IPPROTO_IP) 357 return (EINVAL); 358 359 error = 0; 360 switch (sopt->sopt_dir) { 361 case SOPT_GET: 362 switch (sopt->sopt_name) { 363 case IP_HDRINCL: 364 optval = inp->inp_flags & INP_HDRINCL; 365 error = sooptcopyout(sopt, &optval, sizeof optval); 366 break; 367 368 case IP_FW_ADD: /* ADD actually returns the body... */ 369 case IP_FW_GET: 370 case IP_FW_TABLE_GETSIZE: 371 case IP_FW_TABLE_LIST: 372 error = suser(curthread); 373 if (error != 0) 374 return (error); 375 if (ip_fw_ctl_ptr != NULL) 376 error = ip_fw_ctl_ptr(sopt); 377 else 378 error = ENOPROTOOPT; 379 break; 380 381 case IP_DUMMYNET_GET: 382 error = suser(curthread); 383 if (error != 0) 384 return (error); 385 if (ip_dn_ctl_ptr != NULL) 386 error = ip_dn_ctl_ptr(sopt); 387 else 388 error = ENOPROTOOPT; 389 break ; 390 391 case MRT_INIT: 392 case MRT_DONE: 393 case MRT_ADD_VIF: 394 case MRT_DEL_VIF: 395 case MRT_ADD_MFC: 396 case MRT_DEL_MFC: 397 case MRT_VERSION: 398 case MRT_ASSERT: 399 case MRT_API_SUPPORT: 400 case MRT_API_CONFIG: 401 case MRT_ADD_BW_UPCALL: 402 case MRT_DEL_BW_UPCALL: 403 error = suser(curthread); 404 if (error != 0) 405 return (error); 406 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 407 EOPNOTSUPP; 408 break; 409 410 default: 411 error = ip_ctloutput(so, sopt); 412 break; 413 } 414 break; 415 416 case SOPT_SET: 417 switch (sopt->sopt_name) { 418 case IP_HDRINCL: 419 error = sooptcopyin(sopt, &optval, sizeof optval, 420 sizeof optval); 421 if (error) 422 break; 423 if (optval) 424 inp->inp_flags |= INP_HDRINCL; 425 else 426 inp->inp_flags &= ~INP_HDRINCL; 427 break; 428 429 case IP_FW_ADD: 430 case IP_FW_DEL: 431 case IP_FW_FLUSH: 432 case IP_FW_ZERO: 433 case IP_FW_RESETLOG: 434 case IP_FW_TABLE_ADD: 435 case IP_FW_TABLE_DEL: 436 case IP_FW_TABLE_FLUSH: 437 error = suser(curthread); 438 if (error != 0) 439 return (error); 440 if (ip_fw_ctl_ptr != NULL) 441 error = ip_fw_ctl_ptr(sopt); 442 else 443 error = ENOPROTOOPT; 444 break; 445 446 case IP_DUMMYNET_CONFIGURE: 447 case IP_DUMMYNET_DEL: 448 case IP_DUMMYNET_FLUSH: 449 error = suser(curthread); 450 if (error != 0) 451 return (error); 452 if (ip_dn_ctl_ptr != NULL) 453 error = ip_dn_ctl_ptr(sopt); 454 else 455 error = ENOPROTOOPT ; 456 break ; 457 458 case IP_RSVP_ON: 459 error = suser(curthread); 460 if (error != 0) 461 return (error); 462 error = ip_rsvp_init(so); 463 break; 464 465 case IP_RSVP_OFF: 466 error = suser(curthread); 467 if (error != 0) 468 return (error); 469 error = ip_rsvp_done(); 470 break; 471 472 case IP_RSVP_VIF_ON: 473 case IP_RSVP_VIF_OFF: 474 error = suser(curthread); 475 if (error != 0) 476 return (error); 477 error = ip_rsvp_vif ? 478 ip_rsvp_vif(so, sopt) : EINVAL; 479 break; 480 481 case MRT_INIT: 482 case MRT_DONE: 483 case MRT_ADD_VIF: 484 case MRT_DEL_VIF: 485 case MRT_ADD_MFC: 486 case MRT_DEL_MFC: 487 case MRT_VERSION: 488 case MRT_ASSERT: 489 case MRT_API_SUPPORT: 490 case MRT_API_CONFIG: 491 case MRT_ADD_BW_UPCALL: 492 case MRT_DEL_BW_UPCALL: 493 error = suser(curthread); 494 if (error != 0) 495 return (error); 496 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 497 EOPNOTSUPP; 498 break; 499 500 default: 501 error = ip_ctloutput(so, sopt); 502 break; 503 } 504 break; 505 } 506 507 return (error); 508} 509 510/* 511 * This function exists solely to receive the PRC_IFDOWN messages which 512 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 513 * and calls in_ifadown() to remove all routes corresponding to that address. 514 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 515 * interface routes. 516 */ 517void 518rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 519{ 520 struct in_ifaddr *ia; 521 struct ifnet *ifp; 522 int err; 523 int flags; 524 525 switch (cmd) { 526 case PRC_IFDOWN: 527 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 528 if (ia->ia_ifa.ifa_addr == sa 529 && (ia->ia_flags & IFA_ROUTE)) { 530 /* 531 * in_ifscrub kills the interface route. 532 */ 533 in_ifscrub(ia->ia_ifp, ia); 534 /* 535 * in_ifadown gets rid of all the rest of 536 * the routes. This is not quite the right 537 * thing to do, but at least if we are running 538 * a routing process they will come back. 539 */ 540 in_ifadown(&ia->ia_ifa, 0); 541 break; 542 } 543 } 544 break; 545 546 case PRC_IFUP: 547 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 548 if (ia->ia_ifa.ifa_addr == sa) 549 break; 550 } 551 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 552 return; 553 flags = RTF_UP; 554 ifp = ia->ia_ifa.ifa_ifp; 555 556 if ((ifp->if_flags & IFF_LOOPBACK) 557 || (ifp->if_flags & IFF_POINTOPOINT)) 558 flags |= RTF_HOST; 559 560 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 561 if (err == 0) 562 ia->ia_flags |= IFA_ROUTE; 563 break; 564 } 565} 566 567u_long rip_sendspace = RIPSNDQ; 568u_long rip_recvspace = RIPRCVQ; 569 570SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 571 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 572SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 573 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 574 575static int 576rip_attach(struct socket *so, int proto, struct thread *td) 577{ 578 struct inpcb *inp; 579 int error; 580 581 /* XXX why not lower? */ 582 INP_INFO_WLOCK(&ripcbinfo); 583 inp = sotoinpcb(so); 584 if (inp) { 585 /* XXX counter, printf */ 586 INP_INFO_WUNLOCK(&ripcbinfo); 587 return EINVAL; 588 } 589 if (jailed(td->td_ucred) && !jail_allow_raw_sockets) { 590 INP_INFO_WUNLOCK(&ripcbinfo); 591 return (EPERM); 592 } 593 if ((error = suser_cred(td->td_ucred, SUSER_ALLOWJAIL)) != 0) { 594 INP_INFO_WUNLOCK(&ripcbinfo); 595 return error; 596 } 597 if (proto >= IPPROTO_MAX || proto < 0) { 598 INP_INFO_WUNLOCK(&ripcbinfo); 599 return EPROTONOSUPPORT; 600 } 601 602 error = soreserve(so, rip_sendspace, rip_recvspace); 603 if (error) { 604 INP_INFO_WUNLOCK(&ripcbinfo); 605 return error; 606 } 607 error = in_pcballoc(so, &ripcbinfo, "rawinp"); 608 if (error) { 609 INP_INFO_WUNLOCK(&ripcbinfo); 610 return error; 611 } 612 inp = (struct inpcb *)so->so_pcb; 613 INP_LOCK(inp); 614 INP_INFO_WUNLOCK(&ripcbinfo); 615 inp->inp_vflag |= INP_IPV4; 616 inp->inp_ip_p = proto; 617 inp->inp_ip_ttl = ip_defttl; 618 INP_UNLOCK(inp); 619 return 0; 620} 621 622static void 623rip_pcbdetach(struct socket *so, struct inpcb *inp) 624{ 625 626 INP_INFO_WLOCK_ASSERT(&ripcbinfo); 627 INP_LOCK_ASSERT(inp); 628 629 if (so == ip_mrouter && ip_mrouter_done) 630 ip_mrouter_done(); 631 if (ip_rsvp_force_done) 632 ip_rsvp_force_done(so); 633 if (so == ip_rsvpd) 634 ip_rsvp_done(); 635 in_pcbdetach(inp); 636} 637 638static void 639rip_detach(struct socket *so) 640{ 641 struct inpcb *inp; 642 643 INP_INFO_WLOCK(&ripcbinfo); 644 inp = sotoinpcb(so); 645 if (inp == 0) { 646 /* XXX counter, printf */ 647 INP_INFO_WUNLOCK(&ripcbinfo); 648 return; 649 } 650 INP_LOCK(inp); 651 rip_pcbdetach(so, inp); 652 INP_INFO_WUNLOCK(&ripcbinfo); 653} 654 655static void 656rip_abort(struct socket *so) 657{ 658 struct inpcb *inp; 659 660 INP_INFO_WLOCK(&ripcbinfo); 661 inp = sotoinpcb(so); 662 if (inp == 0) { 663 INP_INFO_WUNLOCK(&ripcbinfo); 664 return; /* ??? possible? panic instead? */ 665 } 666 INP_LOCK(inp); 667 soisdisconnected(so); 668 if (so->so_state & SS_NOFDREF) 669 rip_pcbdetach(so, inp); 670 else 671 INP_UNLOCK(inp); 672 INP_INFO_WUNLOCK(&ripcbinfo); 673} 674 675static int 676rip_disconnect(struct socket *so) 677{ 678 if ((so->so_state & SS_ISCONNECTED) == 0) 679 return ENOTCONN; 680 rip_abort(so); 681 return 0; 682} 683 684static int 685rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 686{ 687 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 688 struct inpcb *inp; 689 690 if (nam->sa_len != sizeof(*addr)) 691 return EINVAL; 692 693 if (jailed(td->td_ucred)) { 694 if (addr->sin_addr.s_addr == INADDR_ANY) 695 addr->sin_addr.s_addr = 696 htonl(prison_getip(td->td_ucred)); 697 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 698 return (EADDRNOTAVAIL); 699 } 700 701 if (TAILQ_EMPTY(&ifnet) || 702 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 703 (addr->sin_addr.s_addr && 704 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 705 return EADDRNOTAVAIL; 706 707 INP_INFO_WLOCK(&ripcbinfo); 708 inp = sotoinpcb(so); 709 if (inp == 0) { 710 INP_INFO_WUNLOCK(&ripcbinfo); 711 return EINVAL; 712 } 713 INP_LOCK(inp); 714 inp->inp_laddr = addr->sin_addr; 715 INP_UNLOCK(inp); 716 INP_INFO_WUNLOCK(&ripcbinfo); 717 return 0; 718} 719 720static int 721rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 722{ 723 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 724 struct inpcb *inp; 725 726 if (nam->sa_len != sizeof(*addr)) 727 return EINVAL; 728 if (TAILQ_EMPTY(&ifnet)) 729 return EADDRNOTAVAIL; 730 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 731 return EAFNOSUPPORT; 732 733 INP_INFO_WLOCK(&ripcbinfo); 734 inp = sotoinpcb(so); 735 if (inp == 0) { 736 INP_INFO_WUNLOCK(&ripcbinfo); 737 return EINVAL; 738 } 739 INP_LOCK(inp); 740 inp->inp_faddr = addr->sin_addr; 741 soisconnected(so); 742 INP_UNLOCK(inp); 743 INP_INFO_WUNLOCK(&ripcbinfo); 744 return 0; 745} 746 747static int 748rip_shutdown(struct socket *so) 749{ 750 struct inpcb *inp; 751 752 INP_INFO_RLOCK(&ripcbinfo); 753 inp = sotoinpcb(so); 754 if (inp == 0) { 755 INP_INFO_RUNLOCK(&ripcbinfo); 756 return EINVAL; 757 } 758 INP_LOCK(inp); 759 INP_INFO_RUNLOCK(&ripcbinfo); 760 socantsendmore(so); 761 INP_UNLOCK(inp); 762 return 0; 763} 764 765static int 766rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 767 struct mbuf *control, struct thread *td) 768{ 769 struct inpcb *inp; 770 u_long dst; 771 int ret; 772 773 INP_INFO_WLOCK(&ripcbinfo); 774 inp = sotoinpcb(so); 775 if (so->so_state & SS_ISCONNECTED) { 776 if (nam) { 777 INP_INFO_WUNLOCK(&ripcbinfo); 778 m_freem(m); 779 return EISCONN; 780 } 781 dst = inp->inp_faddr.s_addr; 782 } else { 783 if (nam == NULL) { 784 INP_INFO_WUNLOCK(&ripcbinfo); 785 m_freem(m); 786 return ENOTCONN; 787 } 788 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 789 } 790 ret = rip_output(m, so, dst); 791 INP_INFO_WUNLOCK(&ripcbinfo); 792 return ret; 793} 794 795static int 796rip_pcblist(SYSCTL_HANDLER_ARGS) 797{ 798 int error, i, n; 799 struct inpcb *inp, **inp_list; 800 inp_gen_t gencnt; 801 struct xinpgen xig; 802 803 /* 804 * The process of preparing the TCB list is too time-consuming and 805 * resource-intensive to repeat twice on every request. 806 */ 807 if (req->oldptr == 0) { 808 n = ripcbinfo.ipi_count; 809 req->oldidx = 2 * (sizeof xig) 810 + (n + n/8) * sizeof(struct xinpcb); 811 return 0; 812 } 813 814 if (req->newptr != 0) 815 return EPERM; 816 817 /* 818 * OK, now we're committed to doing something. 819 */ 820 INP_INFO_RLOCK(&ripcbinfo); 821 gencnt = ripcbinfo.ipi_gencnt; 822 n = ripcbinfo.ipi_count; 823 INP_INFO_RUNLOCK(&ripcbinfo); 824 825 xig.xig_len = sizeof xig; 826 xig.xig_count = n; 827 xig.xig_gen = gencnt; 828 xig.xig_sogen = so_gencnt; 829 error = SYSCTL_OUT(req, &xig, sizeof xig); 830 if (error) 831 return error; 832 833 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 834 if (inp_list == 0) 835 return ENOMEM; 836 837 INP_INFO_RLOCK(&ripcbinfo); 838 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n; 839 inp = LIST_NEXT(inp, inp_list)) { 840 INP_LOCK(inp); 841 if (inp->inp_gencnt <= gencnt && 842 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 843 /* XXX held references? */ 844 inp_list[i++] = inp; 845 } 846 INP_UNLOCK(inp); 847 } 848 INP_INFO_RUNLOCK(&ripcbinfo); 849 n = i; 850 851 error = 0; 852 for (i = 0; i < n; i++) { 853 inp = inp_list[i]; 854 if (inp->inp_gencnt <= gencnt) { 855 struct xinpcb xi; 856 bzero(&xi, sizeof(xi)); 857 xi.xi_len = sizeof xi; 858 /* XXX should avoid extra copy */ 859 bcopy(inp, &xi.xi_inp, sizeof *inp); 860 if (inp->inp_socket) 861 sotoxsocket(inp->inp_socket, &xi.xi_socket); 862 error = SYSCTL_OUT(req, &xi, sizeof xi); 863 } 864 } 865 if (!error) { 866 /* 867 * Give the user an updated idea of our state. 868 * If the generation differs from what we told 869 * her before, she knows that something happened 870 * while we were processing this request, and it 871 * might be necessary to retry. 872 */ 873 INP_INFO_RLOCK(&ripcbinfo); 874 xig.xig_gen = ripcbinfo.ipi_gencnt; 875 xig.xig_sogen = so_gencnt; 876 xig.xig_count = ripcbinfo.ipi_count; 877 INP_INFO_RUNLOCK(&ripcbinfo); 878 error = SYSCTL_OUT(req, &xig, sizeof xig); 879 } 880 free(inp_list, M_TEMP); 881 return error; 882} 883 884/* 885 * This is the wrapper function for in_setsockaddr. We just pass down 886 * the pcbinfo for in_setpeeraddr to lock. 887 */ 888static int 889rip_sockaddr(struct socket *so, struct sockaddr **nam) 890{ 891 return (in_setsockaddr(so, nam, &ripcbinfo)); 892} 893 894/* 895 * This is the wrapper function for in_setpeeraddr. We just pass down 896 * the pcbinfo for in_setpeeraddr to lock. 897 */ 898static int 899rip_peeraddr(struct socket *so, struct sockaddr **nam) 900{ 901 return (in_setpeeraddr(so, nam, &ripcbinfo)); 902} 903 904 905SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 906 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 907 908struct pr_usrreqs rip_usrreqs = { 909 .pru_abort = rip_abort, 910 .pru_attach = rip_attach, 911 .pru_bind = rip_bind, 912 .pru_connect = rip_connect, 913 .pru_control = in_control, 914 .pru_detach = rip_detach, 915 .pru_disconnect = rip_disconnect, 916 .pru_peeraddr = rip_peeraddr, 917 .pru_send = rip_send, 918 .pru_shutdown = rip_shutdown, 919 .pru_sockaddr = rip_sockaddr, 920 .pru_sosetlabel = in_pcbsosetlabel 921}; 922