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. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_inet6.h" 37 #include "opt_ipsec.h" 38 #include "opt_mac.h" 39 40 #include <sys/param.h> 41 #include <sys/jail.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/protosw.h> 49 #include <sys/signalvar.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/sx.h> 53 #include <sys/sysctl.h> 54 #include <sys/systm.h> 55 56 #include <vm/uma.h> 57 58 #include <net/if.h> 59 #include <net/route.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_pcb.h> 64 #include <netinet/in_var.h> 65 #include <netinet/ip.h> 66 #include <netinet/ip_var.h> 67 #include <netinet/ip_mroute.h> 68 69 #include <netinet/ip_fw.h> 70 #include <netinet/ip_dummynet.h> 71 72 #ifdef IPSEC 73 #include <netipsec/ipsec.h> 74 #endif /*IPSEC*/ 75 76 #include <security/mac/mac_framework.h> 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 = NULL; 83 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 84 85 /* 86 * Hooks for multicast routing. They all default to NULL, so leave them not 87 * initialized and rely on BSS being set to 0. 88 */ 89 90 /* 91 * The socket used to communicate with the multicast routing daemon. 92 */ 93 struct socket *ip_mrouter; 94 95 /* 96 * The various mrouter and rsvp functions. 97 */ 98 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 99 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 100 int (*ip_mrouter_done)(void); 101 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 102 struct ip_moptions *); 103 int (*mrt_ioctl)(int, caddr_t, int); 104 int (*legal_vif_num)(int); 105 u_long (*ip_mcast_src)(int); 106 107 void (*rsvp_input_p)(struct mbuf *m, int off); 108 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 109 void (*ip_rsvp_force_done)(struct socket *); 110 111 /* 112 * Hash functions 113 */ 114 115 #define INP_PCBHASH_RAW_SIZE 256 116 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 117 (((proto) + (laddr) + (faddr)) % (mask) + 1) 118 119 static void 120 rip_inshash(struct inpcb *inp) 121 { 122 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 123 struct inpcbhead *pcbhash; 124 int hash; 125 126 INP_INFO_WLOCK_ASSERT(pcbinfo); 127 INP_WLOCK_ASSERT(inp); 128 129 if (inp->inp_ip_p != 0 && 130 inp->inp_laddr.s_addr != INADDR_ANY && 131 inp->inp_faddr.s_addr != INADDR_ANY) { 132 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 133 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 134 } else 135 hash = 0; 136 pcbhash = &pcbinfo->ipi_hashbase[hash]; 137 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 138 } 139 140 static void 141 rip_delhash(struct inpcb *inp) 142 { 143 144 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 145 INP_WLOCK_ASSERT(inp); 146 147 LIST_REMOVE(inp, inp_hash); 148 } 149 150 /* 151 * Raw interface to IP protocol. 152 */ 153 154 /* 155 * Initialize raw connection block q. 156 */ 157 static void 158 rip_zone_change(void *tag) 159 { 160 161 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 162 } 163 164 static int 165 rip_inpcb_init(void *mem, int size, int flags) 166 { 167 struct inpcb *inp = mem; 168 169 INP_LOCK_INIT(inp, "inp", "rawinp"); 170 return (0); 171 } 172 173 void 174 rip_init(void) 175 { 176 177 INP_INFO_LOCK_INIT(&ripcbinfo, "rip"); 178 LIST_INIT(&ripcb); 179 ripcbinfo.ipi_listhead = &ripcb; 180 ripcbinfo.ipi_hashbase = hashinit(INP_PCBHASH_RAW_SIZE, M_PCB, 181 &ripcbinfo.ipi_hashmask); 182 ripcbinfo.ipi_porthashbase = hashinit(1, M_PCB, 183 &ripcbinfo.ipi_porthashmask); 184 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 185 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 186 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets); 187 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 188 EVENTHANDLER_PRI_ANY); 189 } 190 191 static int 192 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 193 struct sockaddr_in *ripsrc) 194 { 195 int policyfail = 0; 196 197 INP_RLOCK_ASSERT(last); 198 199 #ifdef IPSEC 200 /* check AH/ESP integrity. */ 201 if (ipsec4_in_reject(n, last)) { 202 policyfail = 1; 203 } 204 #endif /* IPSEC */ 205 #ifdef MAC 206 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0) 207 policyfail = 1; 208 #endif 209 /* Check the minimum TTL for socket. */ 210 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 211 policyfail = 1; 212 if (!policyfail) { 213 struct mbuf *opts = NULL; 214 struct socket *so; 215 216 so = last->inp_socket; 217 if ((last->inp_flags & INP_CONTROLOPTS) || 218 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 219 ip_savecontrol(last, &opts, ip, n); 220 SOCKBUF_LOCK(&so->so_rcv); 221 if (sbappendaddr_locked(&so->so_rcv, 222 (struct sockaddr *)ripsrc, n, opts) == 0) { 223 /* should notify about lost packet */ 224 m_freem(n); 225 if (opts) 226 m_freem(opts); 227 SOCKBUF_UNLOCK(&so->so_rcv); 228 } else 229 sorwakeup_locked(so); 230 } else 231 m_freem(n); 232 return (policyfail); 233 } 234 235 /* 236 * Setup generic address and protocol structures for raw_input routine, then 237 * pass them along with mbuf chain. 238 */ 239 void 240 rip_input(struct mbuf *m, int off) 241 { 242 struct ip *ip = mtod(m, struct ip *); 243 int proto = ip->ip_p; 244 struct inpcb *inp, *last; 245 struct sockaddr_in ripsrc; 246 int hash; 247 248 bzero(&ripsrc, sizeof(ripsrc)); 249 ripsrc.sin_len = sizeof(ripsrc); 250 ripsrc.sin_family = AF_INET; 251 ripsrc.sin_addr = ip->ip_src; 252 last = NULL; 253 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 254 ip->ip_dst.s_addr, ripcbinfo.ipi_hashmask); 255 INP_INFO_RLOCK(&ripcbinfo); 256 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[hash], inp_hash) { 257 if (inp->inp_ip_p != proto) 258 continue; 259 #ifdef INET6 260 /* XXX inp locking */ 261 if ((inp->inp_vflag & INP_IPV4) == 0) 262 continue; 263 #endif 264 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 265 continue; 266 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 267 continue; 268 if (jailed(inp->inp_cred) && 269 (htonl(prison_getip(inp->inp_cred)) != 270 ip->ip_dst.s_addr)) { 271 continue; 272 } 273 if (last) { 274 struct mbuf *n; 275 276 n = m_copy(m, 0, (int)M_COPYALL); 277 if (n != NULL) 278 (void) rip_append(last, ip, n, &ripsrc); 279 /* XXX count dropped packet */ 280 INP_RUNLOCK(last); 281 } 282 INP_RLOCK(inp); 283 last = inp; 284 } 285 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[0], inp_hash) { 286 if (inp->inp_ip_p && inp->inp_ip_p != proto) 287 continue; 288 #ifdef INET6 289 /* XXX inp locking */ 290 if ((inp->inp_vflag & INP_IPV4) == 0) 291 continue; 292 #endif 293 if (inp->inp_laddr.s_addr && 294 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 295 continue; 296 if (inp->inp_faddr.s_addr && 297 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 298 continue; 299 if (jailed(inp->inp_cred) && 300 (htonl(prison_getip(inp->inp_cred)) != 301 ip->ip_dst.s_addr)) { 302 continue; 303 } 304 if (last) { 305 struct mbuf *n; 306 307 n = m_copy(m, 0, (int)M_COPYALL); 308 if (n != NULL) 309 (void) rip_append(last, ip, n, &ripsrc); 310 /* XXX count dropped packet */ 311 INP_RUNLOCK(last); 312 } 313 INP_RLOCK(inp); 314 last = inp; 315 } 316 INP_INFO_RUNLOCK(&ripcbinfo); 317 if (last != NULL) { 318 if (rip_append(last, ip, m, &ripsrc) != 0) 319 ipstat.ips_delivered--; 320 INP_RUNLOCK(last); 321 } else { 322 m_freem(m); 323 ipstat.ips_noproto++; 324 ipstat.ips_delivered--; 325 } 326 } 327 328 /* 329 * Generate IP header and pass packet to ip_output. Tack on options user may 330 * have setup with control call. 331 */ 332 int 333 rip_output(struct mbuf *m, struct socket *so, u_long dst) 334 { 335 struct ip *ip; 336 int error; 337 struct inpcb *inp = sotoinpcb(so); 338 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 339 IP_ALLOWBROADCAST; 340 341 /* 342 * If the user handed us a complete IP packet, use it. Otherwise, 343 * allocate an mbuf for a header and fill it in. 344 */ 345 if ((inp->inp_flags & INP_HDRINCL) == 0) { 346 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 347 m_freem(m); 348 return(EMSGSIZE); 349 } 350 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 351 if (m == NULL) 352 return(ENOBUFS); 353 354 INP_RLOCK(inp); 355 ip = mtod(m, struct ip *); 356 ip->ip_tos = inp->inp_ip_tos; 357 if (inp->inp_flags & INP_DONTFRAG) 358 ip->ip_off = IP_DF; 359 else 360 ip->ip_off = 0; 361 ip->ip_p = inp->inp_ip_p; 362 ip->ip_len = m->m_pkthdr.len; 363 if (jailed(inp->inp_cred)) 364 ip->ip_src.s_addr = 365 htonl(prison_getip(inp->inp_cred)); 366 else 367 ip->ip_src = inp->inp_laddr; 368 ip->ip_dst.s_addr = dst; 369 ip->ip_ttl = inp->inp_ip_ttl; 370 } else { 371 if (m->m_pkthdr.len > IP_MAXPACKET) { 372 m_freem(m); 373 return(EMSGSIZE); 374 } 375 INP_RLOCK(inp); 376 ip = mtod(m, struct ip *); 377 if (jailed(inp->inp_cred)) { 378 if (ip->ip_src.s_addr != 379 htonl(prison_getip(inp->inp_cred))) { 380 INP_RUNLOCK(inp); 381 m_freem(m); 382 return (EPERM); 383 } 384 } 385 386 /* 387 * Don't allow both user specified and setsockopt options, 388 * and don't allow packet length sizes that will crash. 389 */ 390 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 391 || (ip->ip_len > m->m_pkthdr.len) 392 || (ip->ip_len < (ip->ip_hl << 2))) { 393 INP_RUNLOCK(inp); 394 m_freem(m); 395 return (EINVAL); 396 } 397 if (ip->ip_id == 0) 398 ip->ip_id = ip_newid(); 399 400 /* 401 * XXX prevent ip_output from overwriting header fields. 402 */ 403 flags |= IP_RAWOUTPUT; 404 ipstat.ips_rawout++; 405 } 406 407 if (inp->inp_flags & INP_ONESBCAST) 408 flags |= IP_SENDONES; 409 410 #ifdef MAC 411 mac_create_mbuf_from_inpcb(inp, m); 412 #endif 413 414 error = ip_output(m, inp->inp_options, NULL, flags, 415 inp->inp_moptions, inp); 416 INP_RUNLOCK(inp); 417 return (error); 418 } 419 420 /* 421 * Raw IP socket option processing. 422 * 423 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 424 * only be created by a privileged process, and as such, socket option 425 * operations to manage system properties on any raw socket were allowed to 426 * take place without explicit additional access control checks. However, 427 * raw sockets can now also be created in jail(), and therefore explicit 428 * checks are now required. Likewise, raw sockets can be used by a process 429 * after it gives up privilege, so some caution is required. For options 430 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 431 * performed in ip_ctloutput() and therefore no check occurs here. 432 * Unilaterally checking priv_check() here breaks normal IP socket option 433 * operations on raw sockets. 434 * 435 * When adding new socket options here, make sure to add access control 436 * checks here as necessary. 437 */ 438 int 439 rip_ctloutput(struct socket *so, struct sockopt *sopt) 440 { 441 struct inpcb *inp = sotoinpcb(so); 442 int error, optval; 443 444 if (sopt->sopt_level != IPPROTO_IP) { 445 if ((sopt->sopt_level == SOL_SOCKET) && 446 (sopt->sopt_name == SO_SETFIB)) { 447 inp->inp_inc.inc_fibnum = so->so_fibnum; 448 return (0); 449 } 450 return (EINVAL); 451 } 452 453 error = 0; 454 switch (sopt->sopt_dir) { 455 case SOPT_GET: 456 switch (sopt->sopt_name) { 457 case IP_HDRINCL: 458 optval = inp->inp_flags & INP_HDRINCL; 459 error = sooptcopyout(sopt, &optval, sizeof optval); 460 break; 461 462 case IP_FW_ADD: /* ADD actually returns the body... */ 463 case IP_FW_GET: 464 case IP_FW_TABLE_GETSIZE: 465 case IP_FW_TABLE_LIST: 466 case IP_FW_NAT_GET_CONFIG: 467 case IP_FW_NAT_GET_LOG: 468 if (ip_fw_ctl_ptr != NULL) 469 error = ip_fw_ctl_ptr(sopt); 470 else 471 error = ENOPROTOOPT; 472 break; 473 474 case IP_DUMMYNET_GET: 475 if (ip_dn_ctl_ptr != NULL) 476 error = ip_dn_ctl_ptr(sopt); 477 else 478 error = ENOPROTOOPT; 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 = priv_check(curthread, PRIV_NETINET_MROUTE); 494 if (error != 0) 495 return (error); 496 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 497 EOPNOTSUPP; 498 break; 499 500 default: 501 error = ip_ctloutput(so, sopt); 502 break; 503 } 504 break; 505 506 case SOPT_SET: 507 switch (sopt->sopt_name) { 508 case IP_HDRINCL: 509 error = sooptcopyin(sopt, &optval, sizeof optval, 510 sizeof optval); 511 if (error) 512 break; 513 if (optval) 514 inp->inp_flags |= INP_HDRINCL; 515 else 516 inp->inp_flags &= ~INP_HDRINCL; 517 break; 518 519 case IP_FW_ADD: 520 case IP_FW_DEL: 521 case IP_FW_FLUSH: 522 case IP_FW_ZERO: 523 case IP_FW_RESETLOG: 524 case IP_FW_TABLE_ADD: 525 case IP_FW_TABLE_DEL: 526 case IP_FW_TABLE_FLUSH: 527 case IP_FW_NAT_CFG: 528 case IP_FW_NAT_DEL: 529 if (ip_fw_ctl_ptr != NULL) 530 error = ip_fw_ctl_ptr(sopt); 531 else 532 error = ENOPROTOOPT; 533 break; 534 535 case IP_DUMMYNET_CONFIGURE: 536 case IP_DUMMYNET_DEL: 537 case IP_DUMMYNET_FLUSH: 538 if (ip_dn_ctl_ptr != NULL) 539 error = ip_dn_ctl_ptr(sopt); 540 else 541 error = ENOPROTOOPT ; 542 break ; 543 544 case IP_RSVP_ON: 545 error = priv_check(curthread, PRIV_NETINET_MROUTE); 546 if (error != 0) 547 return (error); 548 error = ip_rsvp_init(so); 549 break; 550 551 case IP_RSVP_OFF: 552 error = priv_check(curthread, PRIV_NETINET_MROUTE); 553 if (error != 0) 554 return (error); 555 error = ip_rsvp_done(); 556 break; 557 558 case IP_RSVP_VIF_ON: 559 case IP_RSVP_VIF_OFF: 560 error = priv_check(curthread, PRIV_NETINET_MROUTE); 561 if (error != 0) 562 return (error); 563 error = ip_rsvp_vif ? 564 ip_rsvp_vif(so, sopt) : EINVAL; 565 break; 566 567 case MRT_INIT: 568 case MRT_DONE: 569 case MRT_ADD_VIF: 570 case MRT_DEL_VIF: 571 case MRT_ADD_MFC: 572 case MRT_DEL_MFC: 573 case MRT_VERSION: 574 case MRT_ASSERT: 575 case MRT_API_SUPPORT: 576 case MRT_API_CONFIG: 577 case MRT_ADD_BW_UPCALL: 578 case MRT_DEL_BW_UPCALL: 579 error = priv_check(curthread, PRIV_NETINET_MROUTE); 580 if (error != 0) 581 return (error); 582 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 583 EOPNOTSUPP; 584 break; 585 586 default: 587 error = ip_ctloutput(so, sopt); 588 break; 589 } 590 break; 591 } 592 593 return (error); 594 } 595 596 /* 597 * This function exists solely to receive the PRC_IFDOWN messages which are 598 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 599 * in_ifadown() to remove all routes corresponding to that address. It also 600 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 601 * routes. 602 */ 603 void 604 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 605 { 606 struct in_ifaddr *ia; 607 struct ifnet *ifp; 608 int err; 609 int flags; 610 611 switch (cmd) { 612 case PRC_IFDOWN: 613 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 614 if (ia->ia_ifa.ifa_addr == sa 615 && (ia->ia_flags & IFA_ROUTE)) { 616 /* 617 * in_ifscrub kills the interface route. 618 */ 619 in_ifscrub(ia->ia_ifp, ia); 620 /* 621 * in_ifadown gets rid of all the rest of the 622 * routes. This is not quite the right thing 623 * to do, but at least if we are running a 624 * routing process they will come back. 625 */ 626 in_ifadown(&ia->ia_ifa, 0); 627 break; 628 } 629 } 630 break; 631 632 case PRC_IFUP: 633 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 634 if (ia->ia_ifa.ifa_addr == sa) 635 break; 636 } 637 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 638 return; 639 flags = RTF_UP; 640 ifp = ia->ia_ifa.ifa_ifp; 641 642 if ((ifp->if_flags & IFF_LOOPBACK) 643 || (ifp->if_flags & IFF_POINTOPOINT)) 644 flags |= RTF_HOST; 645 646 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 647 if (err == 0) 648 ia->ia_flags |= IFA_ROUTE; 649 break; 650 } 651 } 652 653 u_long rip_sendspace = 9216; 654 u_long rip_recvspace = 9216; 655 656 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 657 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 658 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 659 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 660 661 static int 662 rip_attach(struct socket *so, int proto, struct thread *td) 663 { 664 struct inpcb *inp; 665 int error; 666 667 inp = sotoinpcb(so); 668 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 669 670 error = priv_check(td, PRIV_NETINET_RAW); 671 if (error) 672 return (error); 673 if (proto >= IPPROTO_MAX || proto < 0) 674 return EPROTONOSUPPORT; 675 error = soreserve(so, rip_sendspace, rip_recvspace); 676 if (error) 677 return (error); 678 INP_INFO_WLOCK(&ripcbinfo); 679 error = in_pcballoc(so, &ripcbinfo); 680 if (error) { 681 INP_INFO_WUNLOCK(&ripcbinfo); 682 return (error); 683 } 684 inp = (struct inpcb *)so->so_pcb; 685 inp->inp_vflag |= INP_IPV4; 686 inp->inp_ip_p = proto; 687 inp->inp_ip_ttl = ip_defttl; 688 rip_inshash(inp); 689 INP_INFO_WUNLOCK(&ripcbinfo); 690 INP_WUNLOCK(inp); 691 return (0); 692 } 693 694 static void 695 rip_detach(struct socket *so) 696 { 697 struct inpcb *inp; 698 699 inp = sotoinpcb(so); 700 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 701 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 702 ("rip_detach: not closed")); 703 704 INP_INFO_WLOCK(&ripcbinfo); 705 INP_WLOCK(inp); 706 rip_delhash(inp); 707 if (so == ip_mrouter && ip_mrouter_done) 708 ip_mrouter_done(); 709 if (ip_rsvp_force_done) 710 ip_rsvp_force_done(so); 711 if (so == ip_rsvpd) 712 ip_rsvp_done(); 713 in_pcbdetach(inp); 714 in_pcbfree(inp); 715 INP_INFO_WUNLOCK(&ripcbinfo); 716 } 717 718 static void 719 rip_dodisconnect(struct socket *so, struct inpcb *inp) 720 { 721 722 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 723 INP_WLOCK_ASSERT(inp); 724 725 rip_delhash(inp); 726 inp->inp_faddr.s_addr = INADDR_ANY; 727 rip_inshash(inp); 728 SOCK_LOCK(so); 729 so->so_state &= ~SS_ISCONNECTED; 730 SOCK_UNLOCK(so); 731 } 732 733 static void 734 rip_abort(struct socket *so) 735 { 736 struct inpcb *inp; 737 738 inp = sotoinpcb(so); 739 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 740 741 INP_INFO_WLOCK(&ripcbinfo); 742 INP_WLOCK(inp); 743 rip_dodisconnect(so, inp); 744 INP_WUNLOCK(inp); 745 INP_INFO_WUNLOCK(&ripcbinfo); 746 } 747 748 static void 749 rip_close(struct socket *so) 750 { 751 struct inpcb *inp; 752 753 inp = sotoinpcb(so); 754 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 755 756 INP_INFO_WLOCK(&ripcbinfo); 757 INP_WLOCK(inp); 758 rip_dodisconnect(so, inp); 759 INP_WUNLOCK(inp); 760 INP_INFO_WUNLOCK(&ripcbinfo); 761 } 762 763 static int 764 rip_disconnect(struct socket *so) 765 { 766 struct inpcb *inp; 767 768 if ((so->so_state & SS_ISCONNECTED) == 0) 769 return (ENOTCONN); 770 771 inp = sotoinpcb(so); 772 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 773 774 INP_INFO_WLOCK(&ripcbinfo); 775 INP_WLOCK(inp); 776 rip_dodisconnect(so, inp); 777 INP_WUNLOCK(inp); 778 INP_INFO_WUNLOCK(&ripcbinfo); 779 return (0); 780 } 781 782 static int 783 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 784 { 785 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 786 struct inpcb *inp; 787 788 if (nam->sa_len != sizeof(*addr)) 789 return (EINVAL); 790 791 if (jailed(td->td_ucred)) { 792 if (addr->sin_addr.s_addr == INADDR_ANY) 793 addr->sin_addr.s_addr = 794 htonl(prison_getip(td->td_ucred)); 795 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 796 return (EADDRNOTAVAIL); 797 } 798 799 if (TAILQ_EMPTY(&ifnet) || 800 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 801 (addr->sin_addr.s_addr && 802 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 803 return (EADDRNOTAVAIL); 804 805 inp = sotoinpcb(so); 806 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 807 808 INP_INFO_WLOCK(&ripcbinfo); 809 INP_WLOCK(inp); 810 rip_delhash(inp); 811 inp->inp_laddr = addr->sin_addr; 812 rip_inshash(inp); 813 INP_WUNLOCK(inp); 814 INP_INFO_WUNLOCK(&ripcbinfo); 815 return (0); 816 } 817 818 static int 819 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 820 { 821 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 822 struct inpcb *inp; 823 824 if (nam->sa_len != sizeof(*addr)) 825 return (EINVAL); 826 if (TAILQ_EMPTY(&ifnet)) 827 return (EADDRNOTAVAIL); 828 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 829 return (EAFNOSUPPORT); 830 831 inp = sotoinpcb(so); 832 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 833 834 INP_INFO_WLOCK(&ripcbinfo); 835 INP_WLOCK(inp); 836 rip_delhash(inp); 837 inp->inp_faddr = addr->sin_addr; 838 rip_inshash(inp); 839 soisconnected(so); 840 INP_WUNLOCK(inp); 841 INP_INFO_WUNLOCK(&ripcbinfo); 842 return (0); 843 } 844 845 static int 846 rip_shutdown(struct socket *so) 847 { 848 struct inpcb *inp; 849 850 inp = sotoinpcb(so); 851 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 852 853 INP_WLOCK(inp); 854 socantsendmore(so); 855 INP_WUNLOCK(inp); 856 return (0); 857 } 858 859 static int 860 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 861 struct mbuf *control, struct thread *td) 862 { 863 struct inpcb *inp; 864 u_long dst; 865 866 inp = sotoinpcb(so); 867 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 868 869 /* 870 * Note: 'dst' reads below are unlocked. 871 */ 872 if (so->so_state & SS_ISCONNECTED) { 873 if (nam) { 874 m_freem(m); 875 return (EISCONN); 876 } 877 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 878 } else { 879 if (nam == NULL) { 880 m_freem(m); 881 return (ENOTCONN); 882 } 883 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 884 } 885 return (rip_output(m, so, dst)); 886 } 887 888 static int 889 rip_pcblist(SYSCTL_HANDLER_ARGS) 890 { 891 int error, i, n; 892 struct inpcb *inp, **inp_list; 893 inp_gen_t gencnt; 894 struct xinpgen xig; 895 896 /* 897 * The process of preparing the TCB list is too time-consuming and 898 * resource-intensive to repeat twice on every request. 899 */ 900 if (req->oldptr == 0) { 901 n = ripcbinfo.ipi_count; 902 req->oldidx = 2 * (sizeof xig) 903 + (n + n/8) * sizeof(struct xinpcb); 904 return (0); 905 } 906 907 if (req->newptr != 0) 908 return (EPERM); 909 910 /* 911 * OK, now we're committed to doing something. 912 */ 913 INP_INFO_RLOCK(&ripcbinfo); 914 gencnt = ripcbinfo.ipi_gencnt; 915 n = ripcbinfo.ipi_count; 916 INP_INFO_RUNLOCK(&ripcbinfo); 917 918 xig.xig_len = sizeof xig; 919 xig.xig_count = n; 920 xig.xig_gen = gencnt; 921 xig.xig_sogen = so_gencnt; 922 error = SYSCTL_OUT(req, &xig, sizeof xig); 923 if (error) 924 return (error); 925 926 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 927 if (inp_list == 0) 928 return (ENOMEM); 929 930 INP_INFO_RLOCK(&ripcbinfo); 931 for (inp = LIST_FIRST(ripcbinfo.ipi_listhead), i = 0; inp && i < n; 932 inp = LIST_NEXT(inp, inp_list)) { 933 INP_RLOCK(inp); 934 if (inp->inp_gencnt <= gencnt && 935 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 936 /* XXX held references? */ 937 inp_list[i++] = inp; 938 } 939 INP_RUNLOCK(inp); 940 } 941 INP_INFO_RUNLOCK(&ripcbinfo); 942 n = i; 943 944 error = 0; 945 for (i = 0; i < n; i++) { 946 inp = inp_list[i]; 947 INP_RLOCK(inp); 948 if (inp->inp_gencnt <= gencnt) { 949 struct xinpcb xi; 950 bzero(&xi, sizeof(xi)); 951 xi.xi_len = sizeof xi; 952 /* XXX should avoid extra copy */ 953 bcopy(inp, &xi.xi_inp, sizeof *inp); 954 if (inp->inp_socket) 955 sotoxsocket(inp->inp_socket, &xi.xi_socket); 956 INP_RUNLOCK(inp); 957 error = SYSCTL_OUT(req, &xi, sizeof xi); 958 } else 959 INP_RUNLOCK(inp); 960 } 961 if (!error) { 962 /* 963 * Give the user an updated idea of our state. If the 964 * generation differs from what we told her before, she knows 965 * that something happened while we were processing this 966 * request, and it might be necessary to retry. 967 */ 968 INP_INFO_RLOCK(&ripcbinfo); 969 xig.xig_gen = ripcbinfo.ipi_gencnt; 970 xig.xig_sogen = so_gencnt; 971 xig.xig_count = ripcbinfo.ipi_count; 972 INP_INFO_RUNLOCK(&ripcbinfo); 973 error = SYSCTL_OUT(req, &xig, sizeof xig); 974 } 975 free(inp_list, M_TEMP); 976 return (error); 977 } 978 979 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 980 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 981 982 struct pr_usrreqs rip_usrreqs = { 983 .pru_abort = rip_abort, 984 .pru_attach = rip_attach, 985 .pru_bind = rip_bind, 986 .pru_connect = rip_connect, 987 .pru_control = in_control, 988 .pru_detach = rip_detach, 989 .pru_disconnect = rip_disconnect, 990 .pru_peeraddr = in_getpeeraddr, 991 .pru_send = rip_send, 992 .pru_shutdown = rip_shutdown, 993 .pru_sockaddr = in_getsockaddr, 994 .pru_sosetlabel = in_pcbsosetlabel, 995 .pru_close = rip_close, 996 };
Cache object: 38437977e184a1c3bad1bc0d02e92419
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