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 #include <sys/vimage.h> 56 57 #include <vm/uma.h> 58 59 #include <net/if.h> 60 #include <net/route.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/in_pcb.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip_var.h> 68 #include <netinet/ip_mroute.h> 69 70 #include <netinet/ip_fw.h> 71 #include <netinet/ip_dummynet.h> 72 73 #ifdef IPSEC 74 #include <netipsec/ipsec.h> 75 #endif /*IPSEC*/ 76 77 #include <security/mac/mac_framework.h> 78 79 struct inpcbhead ripcb; 80 struct inpcbinfo ripcbinfo; 81 82 /* control hooks for ipfw and dummynet */ 83 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 84 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 85 86 /* 87 * Hooks for multicast routing. They all default to NULL, so leave them not 88 * initialized and rely on BSS being set to 0. 89 */ 90 91 /* 92 * The socket used to communicate with the multicast routing daemon. 93 */ 94 struct socket *ip_mrouter; 95 96 /* 97 * The various mrouter and rsvp functions. 98 */ 99 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 100 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 101 int (*ip_mrouter_done)(void); 102 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 103 struct ip_moptions *); 104 int (*mrt_ioctl)(int, caddr_t, int); 105 int (*legal_vif_num)(int); 106 u_long (*ip_mcast_src)(int); 107 108 void (*rsvp_input_p)(struct mbuf *m, int off); 109 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 110 void (*ip_rsvp_force_done)(struct socket *); 111 112 /* 113 * Hash functions 114 */ 115 116 #define INP_PCBHASH_RAW_SIZE 256 117 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 118 (((proto) + (laddr) + (faddr)) % (mask) + 1) 119 120 static void 121 rip_inshash(struct inpcb *inp) 122 { 123 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 124 struct inpcbhead *pcbhash; 125 int hash; 126 127 INP_INFO_WLOCK_ASSERT(pcbinfo); 128 INP_WLOCK_ASSERT(inp); 129 130 if (inp->inp_ip_p != 0 && 131 inp->inp_laddr.s_addr != INADDR_ANY && 132 inp->inp_faddr.s_addr != INADDR_ANY) { 133 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 134 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 135 } else 136 hash = 0; 137 pcbhash = &pcbinfo->ipi_hashbase[hash]; 138 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 139 } 140 141 static void 142 rip_delhash(struct inpcb *inp) 143 { 144 145 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 146 INP_WLOCK_ASSERT(inp); 147 148 LIST_REMOVE(inp, inp_hash); 149 } 150 151 /* 152 * Raw interface to IP protocol. 153 */ 154 155 /* 156 * Initialize raw connection block q. 157 */ 158 static void 159 rip_zone_change(void *tag) 160 { 161 INIT_VNET_INET(curvnet); 162 163 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 164 } 165 166 static int 167 rip_inpcb_init(void *mem, int size, int flags) 168 { 169 struct inpcb *inp = mem; 170 171 INP_LOCK_INIT(inp, "inp", "rawinp"); 172 return (0); 173 } 174 175 void 176 rip_init(void) 177 { 178 INIT_VNET_INET(curvnet); 179 180 INP_INFO_LOCK_INIT(&V_ripcbinfo, "rip"); 181 LIST_INIT(&V_ripcb); 182 V_ripcbinfo.ipi_listhead = &V_ripcb; 183 V_ripcbinfo.ipi_hashbase = 184 hashinit(INP_PCBHASH_RAW_SIZE, M_PCB, &V_ripcbinfo.ipi_hashmask); 185 V_ripcbinfo.ipi_porthashbase = 186 hashinit(1, M_PCB, &V_ripcbinfo.ipi_porthashmask); 187 V_ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 188 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 189 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 190 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 191 EVENTHANDLER_PRI_ANY); 192 } 193 194 static int 195 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 196 struct sockaddr_in *ripsrc) 197 { 198 int policyfail = 0; 199 200 INP_RLOCK_ASSERT(last); 201 202 #ifdef IPSEC 203 /* check AH/ESP integrity. */ 204 if (ipsec4_in_reject(n, last)) { 205 policyfail = 1; 206 } 207 #endif /* IPSEC */ 208 #ifdef MAC 209 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 210 policyfail = 1; 211 #endif 212 /* Check the minimum TTL for socket. */ 213 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 214 policyfail = 1; 215 if (!policyfail) { 216 struct mbuf *opts = NULL; 217 struct socket *so; 218 219 so = last->inp_socket; 220 if ((last->inp_flags & INP_CONTROLOPTS) || 221 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 222 ip_savecontrol(last, &opts, ip, n); 223 SOCKBUF_LOCK(&so->so_rcv); 224 if (sbappendaddr_locked(&so->so_rcv, 225 (struct sockaddr *)ripsrc, n, opts) == 0) { 226 /* should notify about lost packet */ 227 m_freem(n); 228 if (opts) 229 m_freem(opts); 230 SOCKBUF_UNLOCK(&so->so_rcv); 231 } else 232 sorwakeup_locked(so); 233 } else 234 m_freem(n); 235 return (policyfail); 236 } 237 238 /* 239 * Setup generic address and protocol structures for raw_input routine, then 240 * pass them along with mbuf chain. 241 */ 242 void 243 rip_input(struct mbuf *m, int off) 244 { 245 INIT_VNET_INET(curvnet); 246 struct ip *ip = mtod(m, struct ip *); 247 int proto = ip->ip_p; 248 struct inpcb *inp, *last; 249 struct sockaddr_in ripsrc; 250 int hash; 251 252 bzero(&ripsrc, sizeof(ripsrc)); 253 ripsrc.sin_len = sizeof(ripsrc); 254 ripsrc.sin_family = AF_INET; 255 ripsrc.sin_addr = ip->ip_src; 256 last = NULL; 257 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 258 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 259 INP_INFO_RLOCK(&V_ripcbinfo); 260 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 261 if (inp->inp_ip_p != proto) 262 continue; 263 #ifdef INET6 264 /* XXX inp locking */ 265 if ((inp->inp_vflag & INP_IPV4) == 0) 266 continue; 267 #endif 268 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 269 continue; 270 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 271 continue; 272 if (jailed(inp->inp_cred) && 273 (htonl(prison_getip(inp->inp_cred)) != 274 ip->ip_dst.s_addr)) { 275 continue; 276 } 277 if (last) { 278 struct mbuf *n; 279 280 n = m_copy(m, 0, (int)M_COPYALL); 281 if (n != NULL) 282 (void) rip_append(last, ip, n, &ripsrc); 283 /* XXX count dropped packet */ 284 INP_RUNLOCK(last); 285 } 286 INP_RLOCK(inp); 287 last = inp; 288 } 289 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 290 if (inp->inp_ip_p && inp->inp_ip_p != proto) 291 continue; 292 #ifdef INET6 293 /* XXX inp locking */ 294 if ((inp->inp_vflag & INP_IPV4) == 0) 295 continue; 296 #endif 297 if (inp->inp_laddr.s_addr && 298 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 299 continue; 300 if (inp->inp_faddr.s_addr && 301 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 302 continue; 303 if (jailed(inp->inp_cred) && 304 (htonl(prison_getip(inp->inp_cred)) != 305 ip->ip_dst.s_addr)) { 306 continue; 307 } 308 if (last) { 309 struct mbuf *n; 310 311 n = m_copy(m, 0, (int)M_COPYALL); 312 if (n != NULL) 313 (void) rip_append(last, ip, n, &ripsrc); 314 /* XXX count dropped packet */ 315 INP_RUNLOCK(last); 316 } 317 INP_RLOCK(inp); 318 last = inp; 319 } 320 INP_INFO_RUNLOCK(&V_ripcbinfo); 321 if (last != NULL) { 322 if (rip_append(last, ip, m, &ripsrc) != 0) 323 V_ipstat.ips_delivered--; 324 INP_RUNLOCK(last); 325 } else { 326 m_freem(m); 327 V_ipstat.ips_noproto++; 328 V_ipstat.ips_delivered--; 329 } 330 } 331 332 /* 333 * Generate IP header and pass packet to ip_output. Tack on options user may 334 * have setup with control call. 335 */ 336 int 337 rip_output(struct mbuf *m, struct socket *so, u_long dst) 338 { 339 INIT_VNET_INET(so->so_vnet); 340 struct ip *ip; 341 int error; 342 struct inpcb *inp = sotoinpcb(so); 343 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 344 IP_ALLOWBROADCAST; 345 346 /* 347 * If the user handed us a complete IP packet, use it. Otherwise, 348 * allocate an mbuf for a header and fill it in. 349 */ 350 if ((inp->inp_flags & INP_HDRINCL) == 0) { 351 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 352 m_freem(m); 353 return(EMSGSIZE); 354 } 355 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 356 if (m == NULL) 357 return(ENOBUFS); 358 359 INP_RLOCK(inp); 360 ip = mtod(m, struct ip *); 361 ip->ip_tos = inp->inp_ip_tos; 362 if (inp->inp_flags & INP_DONTFRAG) 363 ip->ip_off = IP_DF; 364 else 365 ip->ip_off = 0; 366 ip->ip_p = inp->inp_ip_p; 367 ip->ip_len = m->m_pkthdr.len; 368 if (jailed(inp->inp_cred)) 369 ip->ip_src.s_addr = 370 htonl(prison_getip(inp->inp_cred)); 371 else 372 ip->ip_src = inp->inp_laddr; 373 ip->ip_dst.s_addr = dst; 374 ip->ip_ttl = inp->inp_ip_ttl; 375 } else { 376 if (m->m_pkthdr.len > IP_MAXPACKET) { 377 m_freem(m); 378 return(EMSGSIZE); 379 } 380 INP_RLOCK(inp); 381 ip = mtod(m, struct ip *); 382 if (jailed(inp->inp_cred)) { 383 if (ip->ip_src.s_addr != 384 htonl(prison_getip(inp->inp_cred))) { 385 INP_RUNLOCK(inp); 386 m_freem(m); 387 return (EPERM); 388 } 389 } 390 391 /* 392 * Don't allow both user specified and setsockopt options, 393 * and don't allow packet length sizes that will crash. 394 */ 395 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 396 || (ip->ip_len > m->m_pkthdr.len) 397 || (ip->ip_len < (ip->ip_hl << 2))) { 398 INP_RUNLOCK(inp); 399 m_freem(m); 400 return (EINVAL); 401 } 402 if (ip->ip_id == 0) 403 ip->ip_id = ip_newid(); 404 405 /* 406 * XXX prevent ip_output from overwriting header fields. 407 */ 408 flags |= IP_RAWOUTPUT; 409 V_ipstat.ips_rawout++; 410 } 411 412 if (inp->inp_flags & INP_ONESBCAST) 413 flags |= IP_SENDONES; 414 415 #ifdef MAC 416 mac_inpcb_create_mbuf(inp, m); 417 #endif 418 419 error = ip_output(m, inp->inp_options, NULL, flags, 420 inp->inp_moptions, inp); 421 INP_RUNLOCK(inp); 422 return (error); 423 } 424 425 /* 426 * Raw IP socket option processing. 427 * 428 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 429 * only be created by a privileged process, and as such, socket option 430 * operations to manage system properties on any raw socket were allowed to 431 * take place without explicit additional access control checks. However, 432 * raw sockets can now also be created in jail(), and therefore explicit 433 * checks are now required. Likewise, raw sockets can be used by a process 434 * after it gives up privilege, so some caution is required. For options 435 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 436 * performed in ip_ctloutput() and therefore no check occurs here. 437 * Unilaterally checking priv_check() here breaks normal IP socket option 438 * operations on raw sockets. 439 * 440 * When adding new socket options here, make sure to add access control 441 * checks here as necessary. 442 */ 443 int 444 rip_ctloutput(struct socket *so, struct sockopt *sopt) 445 { 446 struct inpcb *inp = sotoinpcb(so); 447 int error, optval; 448 449 if (sopt->sopt_level != IPPROTO_IP) 450 return (EINVAL); 451 452 error = 0; 453 switch (sopt->sopt_dir) { 454 case SOPT_GET: 455 switch (sopt->sopt_name) { 456 case IP_HDRINCL: 457 optval = inp->inp_flags & INP_HDRINCL; 458 error = sooptcopyout(sopt, &optval, sizeof optval); 459 break; 460 461 case IP_FW_ADD: /* ADD actually returns the body... */ 462 case IP_FW_GET: 463 case IP_FW_TABLE_GETSIZE: 464 case IP_FW_TABLE_LIST: 465 case IP_FW_NAT_GET_CONFIG: 466 case IP_FW_NAT_GET_LOG: 467 if (ip_fw_ctl_ptr != NULL) 468 error = ip_fw_ctl_ptr(sopt); 469 else 470 error = ENOPROTOOPT; 471 break; 472 473 case IP_DUMMYNET_GET: 474 if (ip_dn_ctl_ptr != NULL) 475 error = ip_dn_ctl_ptr(sopt); 476 else 477 error = ENOPROTOOPT; 478 break ; 479 480 case MRT_INIT: 481 case MRT_DONE: 482 case MRT_ADD_VIF: 483 case MRT_DEL_VIF: 484 case MRT_ADD_MFC: 485 case MRT_DEL_MFC: 486 case MRT_VERSION: 487 case MRT_ASSERT: 488 case MRT_API_SUPPORT: 489 case MRT_API_CONFIG: 490 case MRT_ADD_BW_UPCALL: 491 case MRT_DEL_BW_UPCALL: 492 error = priv_check(curthread, PRIV_NETINET_MROUTE); 493 if (error != 0) 494 return (error); 495 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 496 EOPNOTSUPP; 497 break; 498 499 default: 500 error = ip_ctloutput(so, sopt); 501 break; 502 } 503 break; 504 505 case SOPT_SET: 506 switch (sopt->sopt_name) { 507 case IP_HDRINCL: 508 error = sooptcopyin(sopt, &optval, sizeof optval, 509 sizeof optval); 510 if (error) 511 break; 512 if (optval) 513 inp->inp_flags |= INP_HDRINCL; 514 else 515 inp->inp_flags &= ~INP_HDRINCL; 516 break; 517 518 case IP_FW_ADD: 519 case IP_FW_DEL: 520 case IP_FW_FLUSH: 521 case IP_FW_ZERO: 522 case IP_FW_RESETLOG: 523 case IP_FW_TABLE_ADD: 524 case IP_FW_TABLE_DEL: 525 case IP_FW_TABLE_FLUSH: 526 case IP_FW_NAT_CFG: 527 case IP_FW_NAT_DEL: 528 if (ip_fw_ctl_ptr != NULL) 529 error = ip_fw_ctl_ptr(sopt); 530 else 531 error = ENOPROTOOPT; 532 break; 533 534 case IP_DUMMYNET_CONFIGURE: 535 case IP_DUMMYNET_DEL: 536 case IP_DUMMYNET_FLUSH: 537 if (ip_dn_ctl_ptr != NULL) 538 error = ip_dn_ctl_ptr(sopt); 539 else 540 error = ENOPROTOOPT ; 541 break ; 542 543 case IP_RSVP_ON: 544 error = priv_check(curthread, PRIV_NETINET_MROUTE); 545 if (error != 0) 546 return (error); 547 error = ip_rsvp_init(so); 548 break; 549 550 case IP_RSVP_OFF: 551 error = priv_check(curthread, PRIV_NETINET_MROUTE); 552 if (error != 0) 553 return (error); 554 error = ip_rsvp_done(); 555 break; 556 557 case IP_RSVP_VIF_ON: 558 case IP_RSVP_VIF_OFF: 559 error = priv_check(curthread, PRIV_NETINET_MROUTE); 560 if (error != 0) 561 return (error); 562 error = ip_rsvp_vif ? 563 ip_rsvp_vif(so, sopt) : EINVAL; 564 break; 565 566 case MRT_INIT: 567 case MRT_DONE: 568 case MRT_ADD_VIF: 569 case MRT_DEL_VIF: 570 case MRT_ADD_MFC: 571 case MRT_DEL_MFC: 572 case MRT_VERSION: 573 case MRT_ASSERT: 574 case MRT_API_SUPPORT: 575 case MRT_API_CONFIG: 576 case MRT_ADD_BW_UPCALL: 577 case MRT_DEL_BW_UPCALL: 578 error = priv_check(curthread, PRIV_NETINET_MROUTE); 579 if (error != 0) 580 return (error); 581 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 582 EOPNOTSUPP; 583 break; 584 585 default: 586 error = ip_ctloutput(so, sopt); 587 break; 588 } 589 break; 590 } 591 592 return (error); 593 } 594 595 /* 596 * This function exists solely to receive the PRC_IFDOWN messages which are 597 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 598 * in_ifadown() to remove all routes corresponding to that address. It also 599 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 600 * routes. 601 */ 602 void 603 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 604 { 605 INIT_VNET_INET(curvnet); 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, &V_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, &V_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 INIT_VNET_INET(so->so_vnet); 665 struct inpcb *inp; 666 int error; 667 668 inp = sotoinpcb(so); 669 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 670 671 error = priv_check(td, PRIV_NETINET_RAW); 672 if (error) 673 return (error); 674 if (proto >= IPPROTO_MAX || proto < 0) 675 return EPROTONOSUPPORT; 676 error = soreserve(so, rip_sendspace, rip_recvspace); 677 if (error) 678 return (error); 679 INP_INFO_WLOCK(&V_ripcbinfo); 680 error = in_pcballoc(so, &V_ripcbinfo); 681 if (error) { 682 INP_INFO_WUNLOCK(&V_ripcbinfo); 683 return (error); 684 } 685 inp = (struct inpcb *)so->so_pcb; 686 inp->inp_vflag |= INP_IPV4; 687 inp->inp_ip_p = proto; 688 inp->inp_ip_ttl = V_ip_defttl; 689 rip_inshash(inp); 690 INP_INFO_WUNLOCK(&V_ripcbinfo); 691 INP_WUNLOCK(inp); 692 return (0); 693 } 694 695 static void 696 rip_detach(struct socket *so) 697 { 698 INIT_VNET_INET(so->so_vnet); 699 struct inpcb *inp; 700 701 inp = sotoinpcb(so); 702 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 703 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 704 ("rip_detach: not closed")); 705 706 INP_INFO_WLOCK(&V_ripcbinfo); 707 INP_WLOCK(inp); 708 rip_delhash(inp); 709 if (so == V_ip_mrouter && ip_mrouter_done) 710 ip_mrouter_done(); 711 if (ip_rsvp_force_done) 712 ip_rsvp_force_done(so); 713 if (so == V_ip_rsvpd) 714 ip_rsvp_done(); 715 in_pcbdetach(inp); 716 in_pcbfree(inp); 717 INP_INFO_WUNLOCK(&V_ripcbinfo); 718 } 719 720 static void 721 rip_dodisconnect(struct socket *so, struct inpcb *inp) 722 { 723 724 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 725 INP_WLOCK_ASSERT(inp); 726 727 rip_delhash(inp); 728 inp->inp_faddr.s_addr = INADDR_ANY; 729 rip_inshash(inp); 730 SOCK_LOCK(so); 731 so->so_state &= ~SS_ISCONNECTED; 732 SOCK_UNLOCK(so); 733 } 734 735 static void 736 rip_abort(struct socket *so) 737 { 738 INIT_VNET_INET(so->so_vnet); 739 struct inpcb *inp; 740 741 inp = sotoinpcb(so); 742 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 743 744 INP_INFO_WLOCK(&V_ripcbinfo); 745 INP_WLOCK(inp); 746 rip_dodisconnect(so, inp); 747 INP_WUNLOCK(inp); 748 INP_INFO_WUNLOCK(&V_ripcbinfo); 749 } 750 751 static void 752 rip_close(struct socket *so) 753 { 754 INIT_VNET_INET(so->so_vnet); 755 struct inpcb *inp; 756 757 inp = sotoinpcb(so); 758 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 759 760 INP_INFO_WLOCK(&V_ripcbinfo); 761 INP_WLOCK(inp); 762 rip_dodisconnect(so, inp); 763 INP_WUNLOCK(inp); 764 INP_INFO_WUNLOCK(&V_ripcbinfo); 765 } 766 767 static int 768 rip_disconnect(struct socket *so) 769 { 770 INIT_VNET_INET(so->so_vnet); 771 struct inpcb *inp; 772 773 if ((so->so_state & SS_ISCONNECTED) == 0) 774 return (ENOTCONN); 775 776 inp = sotoinpcb(so); 777 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 778 779 INP_INFO_WLOCK(&V_ripcbinfo); 780 INP_WLOCK(inp); 781 rip_dodisconnect(so, inp); 782 INP_WUNLOCK(inp); 783 INP_INFO_WUNLOCK(&V_ripcbinfo); 784 return (0); 785 } 786 787 static int 788 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 789 { 790 INIT_VNET_NET(so->so_vnet); 791 INIT_VNET_INET(so->so_vnet); 792 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 793 struct inpcb *inp; 794 795 if (nam->sa_len != sizeof(*addr)) 796 return (EINVAL); 797 798 if (jailed(td->td_ucred)) { 799 if (addr->sin_addr.s_addr == INADDR_ANY) 800 addr->sin_addr.s_addr = 801 htonl(prison_getip(td->td_ucred)); 802 if (htonl(prison_getip(td->td_ucred)) != addr->sin_addr.s_addr) 803 return (EADDRNOTAVAIL); 804 } 805 806 if (TAILQ_EMPTY(&V_ifnet) || 807 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 808 (addr->sin_addr.s_addr && 809 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 810 return (EADDRNOTAVAIL); 811 812 inp = sotoinpcb(so); 813 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 814 815 INP_INFO_WLOCK(&V_ripcbinfo); 816 INP_WLOCK(inp); 817 rip_delhash(inp); 818 inp->inp_laddr = addr->sin_addr; 819 rip_inshash(inp); 820 INP_WUNLOCK(inp); 821 INP_INFO_WUNLOCK(&V_ripcbinfo); 822 return (0); 823 } 824 825 static int 826 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 827 { 828 INIT_VNET_NET(so->so_vnet); 829 INIT_VNET_INET(so->so_vnet); 830 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 831 struct inpcb *inp; 832 833 if (nam->sa_len != sizeof(*addr)) 834 return (EINVAL); 835 if (TAILQ_EMPTY(&V_ifnet)) 836 return (EADDRNOTAVAIL); 837 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 838 return (EAFNOSUPPORT); 839 840 inp = sotoinpcb(so); 841 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 842 843 INP_INFO_WLOCK(&V_ripcbinfo); 844 INP_WLOCK(inp); 845 rip_delhash(inp); 846 inp->inp_faddr = addr->sin_addr; 847 rip_inshash(inp); 848 soisconnected(so); 849 INP_WUNLOCK(inp); 850 INP_INFO_WUNLOCK(&V_ripcbinfo); 851 return (0); 852 } 853 854 static int 855 rip_shutdown(struct socket *so) 856 { 857 struct inpcb *inp; 858 859 inp = sotoinpcb(so); 860 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 861 862 INP_WLOCK(inp); 863 socantsendmore(so); 864 INP_WUNLOCK(inp); 865 return (0); 866 } 867 868 static int 869 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 870 struct mbuf *control, struct thread *td) 871 { 872 struct inpcb *inp; 873 u_long dst; 874 875 inp = sotoinpcb(so); 876 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 877 878 /* 879 * Note: 'dst' reads below are unlocked. 880 */ 881 if (so->so_state & SS_ISCONNECTED) { 882 if (nam) { 883 m_freem(m); 884 return (EISCONN); 885 } 886 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 887 } else { 888 if (nam == NULL) { 889 m_freem(m); 890 return (ENOTCONN); 891 } 892 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 893 } 894 return (rip_output(m, so, dst)); 895 } 896 897 static int 898 rip_pcblist(SYSCTL_HANDLER_ARGS) 899 { 900 INIT_VNET_INET(curvnet); 901 int error, i, n; 902 struct inpcb *inp, **inp_list; 903 inp_gen_t gencnt; 904 struct xinpgen xig; 905 906 /* 907 * The process of preparing the TCB list is too time-consuming and 908 * resource-intensive to repeat twice on every request. 909 */ 910 if (req->oldptr == 0) { 911 n = V_ripcbinfo.ipi_count; 912 req->oldidx = 2 * (sizeof xig) 913 + (n + n/8) * sizeof(struct xinpcb); 914 return (0); 915 } 916 917 if (req->newptr != 0) 918 return (EPERM); 919 920 /* 921 * OK, now we're committed to doing something. 922 */ 923 INP_INFO_RLOCK(&V_ripcbinfo); 924 gencnt = V_ripcbinfo.ipi_gencnt; 925 n = V_ripcbinfo.ipi_count; 926 INP_INFO_RUNLOCK(&V_ripcbinfo); 927 928 xig.xig_len = sizeof xig; 929 xig.xig_count = n; 930 xig.xig_gen = gencnt; 931 xig.xig_sogen = so_gencnt; 932 error = SYSCTL_OUT(req, &xig, sizeof xig); 933 if (error) 934 return (error); 935 936 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 937 if (inp_list == 0) 938 return (ENOMEM); 939 940 INP_INFO_RLOCK(&V_ripcbinfo); 941 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 942 inp = LIST_NEXT(inp, inp_list)) { 943 INP_RLOCK(inp); 944 if (inp->inp_gencnt <= gencnt && 945 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) { 946 /* XXX held references? */ 947 inp_list[i++] = inp; 948 } 949 INP_RUNLOCK(inp); 950 } 951 INP_INFO_RUNLOCK(&V_ripcbinfo); 952 n = i; 953 954 error = 0; 955 for (i = 0; i < n; i++) { 956 inp = inp_list[i]; 957 INP_RLOCK(inp); 958 if (inp->inp_gencnt <= gencnt) { 959 struct xinpcb xi; 960 bzero(&xi, sizeof(xi)); 961 xi.xi_len = sizeof xi; 962 /* XXX should avoid extra copy */ 963 bcopy(inp, &xi.xi_inp, sizeof *inp); 964 if (inp->inp_socket) 965 sotoxsocket(inp->inp_socket, &xi.xi_socket); 966 INP_RUNLOCK(inp); 967 error = SYSCTL_OUT(req, &xi, sizeof xi); 968 } else 969 INP_RUNLOCK(inp); 970 } 971 if (!error) { 972 /* 973 * Give the user an updated idea of our state. If the 974 * generation differs from what we told her before, she knows 975 * that something happened while we were processing this 976 * request, and it might be necessary to retry. 977 */ 978 INP_INFO_RLOCK(&V_ripcbinfo); 979 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 980 xig.xig_sogen = so_gencnt; 981 xig.xig_count = V_ripcbinfo.ipi_count; 982 INP_INFO_RUNLOCK(&V_ripcbinfo); 983 error = SYSCTL_OUT(req, &xig, sizeof xig); 984 } 985 free(inp_list, M_TEMP); 986 return (error); 987 } 988 989 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 990 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 991 992 struct pr_usrreqs rip_usrreqs = { 993 .pru_abort = rip_abort, 994 .pru_attach = rip_attach, 995 .pru_bind = rip_bind, 996 .pru_connect = rip_connect, 997 .pru_control = in_control, 998 .pru_detach = rip_detach, 999 .pru_disconnect = rip_disconnect, 1000 .pru_peeraddr = in_getpeeraddr, 1001 .pru_send = rip_send, 1002 .pru_shutdown = rip_shutdown, 1003 .pru_sockaddr = in_getsockaddr, 1004 .pru_sosetlabel = in_pcbsosetlabel, 1005 .pru_close = rip_close, 1006 }; 1007