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_route.h" 39 #include "opt_mac.h" 40 41 #include <sys/param.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/rwlock.h> 51 #include <sys/signalvar.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/sx.h> 55 #include <sys/sysctl.h> 56 #include <sys/systm.h> 57 #include <sys/vimage.h> 58 59 #include <vm/uma.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/in_pcb.h> 68 #include <netinet/in_var.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/ip_mroute.h> 72 73 #include <netinet/ip_fw.h> 74 #include <netinet/ip_dummynet.h> 75 #include <netinet/vinet.h> 76 77 #ifdef IPSEC 78 #include <netipsec/ipsec.h> 79 #endif /*IPSEC*/ 80 81 #include <security/mac/mac_framework.h> 82 83 #ifdef VIMAGE_GLOBALS 84 struct inpcbhead ripcb; 85 struct inpcbinfo ripcbinfo; 86 #endif 87 88 /* control hooks for ipfw and dummynet */ 89 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL; 90 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL; 91 92 /* 93 * Hooks for multicast routing. They all default to NULL, so leave them not 94 * initialized and rely on BSS being set to 0. 95 */ 96 97 /* 98 * The socket used to communicate with the multicast routing daemon. 99 */ 100 #ifdef VIMAGE_GLOBALS 101 struct socket *ip_mrouter; 102 #endif 103 104 /* 105 * The various mrouter and rsvp functions. 106 */ 107 int (*ip_mrouter_set)(struct socket *, struct sockopt *); 108 int (*ip_mrouter_get)(struct socket *, struct sockopt *); 109 int (*ip_mrouter_done)(void); 110 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *, 111 struct ip_moptions *); 112 int (*mrt_ioctl)(int, caddr_t, int); 113 int (*legal_vif_num)(int); 114 u_long (*ip_mcast_src)(int); 115 116 void (*rsvp_input_p)(struct mbuf *m, int off); 117 int (*ip_rsvp_vif)(struct socket *, struct sockopt *); 118 void (*ip_rsvp_force_done)(struct socket *); 119 120 /* 121 * Hash functions 122 */ 123 124 #define INP_PCBHASH_RAW_SIZE 256 125 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \ 126 (((proto) + (laddr) + (faddr)) % (mask) + 1) 127 128 static void 129 rip_inshash(struct inpcb *inp) 130 { 131 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 132 struct inpcbhead *pcbhash; 133 int hash; 134 135 INP_INFO_WLOCK_ASSERT(pcbinfo); 136 INP_WLOCK_ASSERT(inp); 137 138 if (inp->inp_ip_p != 0 && 139 inp->inp_laddr.s_addr != INADDR_ANY && 140 inp->inp_faddr.s_addr != INADDR_ANY) { 141 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr, 142 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask); 143 } else 144 hash = 0; 145 pcbhash = &pcbinfo->ipi_hashbase[hash]; 146 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 147 } 148 149 static void 150 rip_delhash(struct inpcb *inp) 151 { 152 153 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 154 INP_WLOCK_ASSERT(inp); 155 156 LIST_REMOVE(inp, inp_hash); 157 } 158 159 /* 160 * Raw interface to IP protocol. 161 */ 162 163 /* 164 * Initialize raw connection block q. 165 */ 166 static void 167 rip_zone_change(void *tag) 168 { 169 INIT_VNET_INET(curvnet); 170 171 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 172 } 173 174 static int 175 rip_inpcb_init(void *mem, int size, int flags) 176 { 177 struct inpcb *inp = mem; 178 179 INP_LOCK_INIT(inp, "inp", "rawinp"); 180 return (0); 181 } 182 183 void 184 rip_init(void) 185 { 186 INIT_VNET_INET(curvnet); 187 188 INP_INFO_LOCK_INIT(&V_ripcbinfo, "rip"); 189 LIST_INIT(&V_ripcb); 190 V_ripcbinfo.ipi_listhead = &V_ripcb; 191 V_ripcbinfo.ipi_hashbase = 192 hashinit(INP_PCBHASH_RAW_SIZE, M_PCB, &V_ripcbinfo.ipi_hashmask); 193 V_ripcbinfo.ipi_porthashbase = 194 hashinit(1, M_PCB, &V_ripcbinfo.ipi_porthashmask); 195 V_ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb), 196 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 197 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets); 198 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL, 199 EVENTHANDLER_PRI_ANY); 200 } 201 202 static int 203 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 204 struct sockaddr_in *ripsrc) 205 { 206 int policyfail = 0; 207 208 INP_RLOCK_ASSERT(last); 209 210 #ifdef IPSEC 211 /* check AH/ESP integrity. */ 212 if (ipsec4_in_reject(n, last)) { 213 policyfail = 1; 214 } 215 #endif /* IPSEC */ 216 #ifdef MAC 217 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0) 218 policyfail = 1; 219 #endif 220 /* Check the minimum TTL for socket. */ 221 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl) 222 policyfail = 1; 223 if (!policyfail) { 224 struct mbuf *opts = NULL; 225 struct socket *so; 226 227 so = last->inp_socket; 228 if ((last->inp_flags & INP_CONTROLOPTS) || 229 (so->so_options & (SO_TIMESTAMP | SO_BINTIME))) 230 ip_savecontrol(last, &opts, ip, n); 231 SOCKBUF_LOCK(&so->so_rcv); 232 if (sbappendaddr_locked(&so->so_rcv, 233 (struct sockaddr *)ripsrc, n, opts) == 0) { 234 /* should notify about lost packet */ 235 m_freem(n); 236 if (opts) 237 m_freem(opts); 238 SOCKBUF_UNLOCK(&so->so_rcv); 239 } else 240 sorwakeup_locked(so); 241 } else 242 m_freem(n); 243 return (policyfail); 244 } 245 246 /* 247 * Setup generic address and protocol structures for raw_input routine, then 248 * pass them along with mbuf chain. 249 */ 250 void 251 rip_input(struct mbuf *m, int off) 252 { 253 INIT_VNET_INET(curvnet); 254 struct ip *ip = mtod(m, struct ip *); 255 int proto = ip->ip_p; 256 struct inpcb *inp, *last; 257 struct sockaddr_in ripsrc; 258 int hash; 259 260 bzero(&ripsrc, sizeof(ripsrc)); 261 ripsrc.sin_len = sizeof(ripsrc); 262 ripsrc.sin_family = AF_INET; 263 ripsrc.sin_addr = ip->ip_src; 264 last = NULL; 265 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr, 266 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask); 267 INP_INFO_RLOCK(&V_ripcbinfo); 268 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) { 269 if (inp->inp_ip_p != proto) 270 continue; 271 #ifdef INET6 272 /* XXX inp locking */ 273 if ((inp->inp_vflag & INP_IPV4) == 0) 274 continue; 275 #endif 276 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 277 continue; 278 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr) 279 continue; 280 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 281 continue; 282 if (last != NULL) { 283 struct mbuf *n; 284 285 n = m_copy(m, 0, (int)M_COPYALL); 286 if (n != NULL) 287 (void) rip_append(last, ip, n, &ripsrc); 288 /* XXX count dropped packet */ 289 INP_RUNLOCK(last); 290 } 291 INP_RLOCK(inp); 292 last = inp; 293 } 294 LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) { 295 if (inp->inp_ip_p && inp->inp_ip_p != proto) 296 continue; 297 #ifdef INET6 298 /* XXX inp locking */ 299 if ((inp->inp_vflag & INP_IPV4) == 0) 300 continue; 301 #endif 302 if (inp->inp_laddr.s_addr && 303 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 304 continue; 305 if (inp->inp_faddr.s_addr && 306 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 307 continue; 308 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0) 309 continue; 310 if (last != NULL) { 311 struct mbuf *n; 312 313 n = m_copy(m, 0, (int)M_COPYALL); 314 if (n != NULL) 315 (void) rip_append(last, ip, n, &ripsrc); 316 /* XXX count dropped packet */ 317 INP_RUNLOCK(last); 318 } 319 INP_RLOCK(inp); 320 last = inp; 321 } 322 INP_INFO_RUNLOCK(&V_ripcbinfo); 323 if (last != NULL) { 324 if (rip_append(last, ip, m, &ripsrc) != 0) 325 V_ipstat.ips_delivered--; 326 INP_RUNLOCK(last); 327 } else { 328 m_freem(m); 329 V_ipstat.ips_noproto++; 330 V_ipstat.ips_delivered--; 331 } 332 } 333 334 /* 335 * Generate IP header and pass packet to ip_output. Tack on options user may 336 * have setup with control call. 337 */ 338 int 339 rip_output(struct mbuf *m, struct socket *so, u_long dst) 340 { 341 INIT_VNET_INET(so->so_vnet); 342 struct ip *ip; 343 int error; 344 struct inpcb *inp = sotoinpcb(so); 345 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | 346 IP_ALLOWBROADCAST; 347 348 /* 349 * If the user handed us a complete IP packet, use it. Otherwise, 350 * allocate an mbuf for a header and fill it in. 351 */ 352 if ((inp->inp_flags & INP_HDRINCL) == 0) { 353 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 354 m_freem(m); 355 return(EMSGSIZE); 356 } 357 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 358 if (m == NULL) 359 return(ENOBUFS); 360 361 INP_RLOCK(inp); 362 ip = mtod(m, struct ip *); 363 ip->ip_tos = inp->inp_ip_tos; 364 if (inp->inp_flags & INP_DONTFRAG) 365 ip->ip_off = IP_DF; 366 else 367 ip->ip_off = 0; 368 ip->ip_p = inp->inp_ip_p; 369 ip->ip_len = m->m_pkthdr.len; 370 ip->ip_src = inp->inp_laddr; 371 error = prison_get_ip4(inp->inp_cred, &ip->ip_src); 372 if (error != 0) { 373 INP_RUNLOCK(inp); 374 m_freem(m); 375 return (error); 376 } 377 ip->ip_dst.s_addr = dst; 378 ip->ip_ttl = inp->inp_ip_ttl; 379 } else { 380 if (m->m_pkthdr.len > IP_MAXPACKET) { 381 m_freem(m); 382 return(EMSGSIZE); 383 } 384 INP_RLOCK(inp); 385 ip = mtod(m, struct ip *); 386 error = prison_check_ip4(inp->inp_cred, &ip->ip_src); 387 if (error != 0) { 388 INP_RUNLOCK(inp); 389 m_freem(m); 390 return (error); 391 } 392 393 /* 394 * Don't allow both user specified and setsockopt options, 395 * and don't allow packet length sizes that will crash. 396 */ 397 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) 398 || (ip->ip_len > m->m_pkthdr.len) 399 || (ip->ip_len < (ip->ip_hl << 2))) { 400 INP_RUNLOCK(inp); 401 m_freem(m); 402 return (EINVAL); 403 } 404 if (ip->ip_id == 0) 405 ip->ip_id = ip_newid(); 406 407 /* 408 * XXX prevent ip_output from overwriting header fields. 409 */ 410 flags |= IP_RAWOUTPUT; 411 V_ipstat.ips_rawout++; 412 } 413 414 if (inp->inp_flags & INP_ONESBCAST) 415 flags |= IP_SENDONES; 416 417 #ifdef MAC 418 mac_inpcb_create_mbuf(inp, m); 419 #endif 420 421 error = ip_output(m, inp->inp_options, NULL, flags, 422 inp->inp_moptions, inp); 423 INP_RUNLOCK(inp); 424 return (error); 425 } 426 427 /* 428 * Raw IP socket option processing. 429 * 430 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could 431 * only be created by a privileged process, and as such, socket option 432 * operations to manage system properties on any raw socket were allowed to 433 * take place without explicit additional access control checks. However, 434 * raw sockets can now also be created in jail(), and therefore explicit 435 * checks are now required. Likewise, raw sockets can be used by a process 436 * after it gives up privilege, so some caution is required. For options 437 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be 438 * performed in ip_ctloutput() and therefore no check occurs here. 439 * Unilaterally checking priv_check() here breaks normal IP socket option 440 * operations on raw sockets. 441 * 442 * When adding new socket options here, make sure to add access control 443 * checks here as necessary. 444 */ 445 int 446 rip_ctloutput(struct socket *so, struct sockopt *sopt) 447 { 448 struct inpcb *inp = sotoinpcb(so); 449 int error, optval; 450 451 if (sopt->sopt_level != IPPROTO_IP) { 452 if ((sopt->sopt_level == SOL_SOCKET) && 453 (sopt->sopt_name == SO_SETFIB)) { 454 inp->inp_inc.inc_fibnum = so->so_fibnum; 455 return (0); 456 } 457 return (EINVAL); 458 } 459 460 error = 0; 461 switch (sopt->sopt_dir) { 462 case SOPT_GET: 463 switch (sopt->sopt_name) { 464 case IP_HDRINCL: 465 optval = inp->inp_flags & INP_HDRINCL; 466 error = sooptcopyout(sopt, &optval, sizeof optval); 467 break; 468 469 case IP_FW_ADD: /* ADD actually returns the body... */ 470 case IP_FW_GET: 471 case IP_FW_TABLE_GETSIZE: 472 case IP_FW_TABLE_LIST: 473 case IP_FW_NAT_GET_CONFIG: 474 case IP_FW_NAT_GET_LOG: 475 if (ip_fw_ctl_ptr != NULL) 476 error = ip_fw_ctl_ptr(sopt); 477 else 478 error = ENOPROTOOPT; 479 break; 480 481 case IP_DUMMYNET_GET: 482 if (ip_dn_ctl_ptr != NULL) 483 error = ip_dn_ctl_ptr(sopt); 484 else 485 error = ENOPROTOOPT; 486 break ; 487 488 case MRT_INIT: 489 case MRT_DONE: 490 case MRT_ADD_VIF: 491 case MRT_DEL_VIF: 492 case MRT_ADD_MFC: 493 case MRT_DEL_MFC: 494 case MRT_VERSION: 495 case MRT_ASSERT: 496 case MRT_API_SUPPORT: 497 case MRT_API_CONFIG: 498 case MRT_ADD_BW_UPCALL: 499 case MRT_DEL_BW_UPCALL: 500 error = priv_check(curthread, PRIV_NETINET_MROUTE); 501 if (error != 0) 502 return (error); 503 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) : 504 EOPNOTSUPP; 505 break; 506 507 default: 508 error = ip_ctloutput(so, sopt); 509 break; 510 } 511 break; 512 513 case SOPT_SET: 514 switch (sopt->sopt_name) { 515 case IP_HDRINCL: 516 error = sooptcopyin(sopt, &optval, sizeof optval, 517 sizeof optval); 518 if (error) 519 break; 520 if (optval) 521 inp->inp_flags |= INP_HDRINCL; 522 else 523 inp->inp_flags &= ~INP_HDRINCL; 524 break; 525 526 case IP_FW_ADD: 527 case IP_FW_DEL: 528 case IP_FW_FLUSH: 529 case IP_FW_ZERO: 530 case IP_FW_RESETLOG: 531 case IP_FW_TABLE_ADD: 532 case IP_FW_TABLE_DEL: 533 case IP_FW_TABLE_FLUSH: 534 case IP_FW_NAT_CFG: 535 case IP_FW_NAT_DEL: 536 if (ip_fw_ctl_ptr != NULL) 537 error = ip_fw_ctl_ptr(sopt); 538 else 539 error = ENOPROTOOPT; 540 break; 541 542 case IP_DUMMYNET_CONFIGURE: 543 case IP_DUMMYNET_DEL: 544 case IP_DUMMYNET_FLUSH: 545 if (ip_dn_ctl_ptr != NULL) 546 error = ip_dn_ctl_ptr(sopt); 547 else 548 error = ENOPROTOOPT ; 549 break ; 550 551 case IP_RSVP_ON: 552 error = priv_check(curthread, PRIV_NETINET_MROUTE); 553 if (error != 0) 554 return (error); 555 error = ip_rsvp_init(so); 556 break; 557 558 case IP_RSVP_OFF: 559 error = priv_check(curthread, PRIV_NETINET_MROUTE); 560 if (error != 0) 561 return (error); 562 error = ip_rsvp_done(); 563 break; 564 565 case IP_RSVP_VIF_ON: 566 case IP_RSVP_VIF_OFF: 567 error = priv_check(curthread, PRIV_NETINET_MROUTE); 568 if (error != 0) 569 return (error); 570 error = ip_rsvp_vif ? 571 ip_rsvp_vif(so, sopt) : EINVAL; 572 break; 573 574 case MRT_INIT: 575 case MRT_DONE: 576 case MRT_ADD_VIF: 577 case MRT_DEL_VIF: 578 case MRT_ADD_MFC: 579 case MRT_DEL_MFC: 580 case MRT_VERSION: 581 case MRT_ASSERT: 582 case MRT_API_SUPPORT: 583 case MRT_API_CONFIG: 584 case MRT_ADD_BW_UPCALL: 585 case MRT_DEL_BW_UPCALL: 586 error = priv_check(curthread, PRIV_NETINET_MROUTE); 587 if (error != 0) 588 return (error); 589 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) : 590 EOPNOTSUPP; 591 break; 592 593 default: 594 error = ip_ctloutput(so, sopt); 595 break; 596 } 597 break; 598 } 599 600 return (error); 601 } 602 603 /* 604 * This function exists solely to receive the PRC_IFDOWN messages which are 605 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls 606 * in_ifadown() to remove all routes corresponding to that address. It also 607 * receives the PRC_IFUP messages from if_up() and reinstalls the interface 608 * routes. 609 */ 610 void 611 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip) 612 { 613 INIT_VNET_INET(curvnet); 614 struct in_ifaddr *ia; 615 struct ifnet *ifp; 616 int err; 617 int flags; 618 619 switch (cmd) { 620 case PRC_IFDOWN: 621 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 622 if (ia->ia_ifa.ifa_addr == sa 623 && (ia->ia_flags & IFA_ROUTE)) { 624 /* 625 * in_ifscrub kills the interface route. 626 */ 627 in_ifscrub(ia->ia_ifp, ia); 628 /* 629 * in_ifadown gets rid of all the rest of the 630 * routes. This is not quite the right thing 631 * to do, but at least if we are running a 632 * routing process they will come back. 633 */ 634 in_ifadown(&ia->ia_ifa, 0); 635 break; 636 } 637 } 638 break; 639 640 case PRC_IFUP: 641 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 642 if (ia->ia_ifa.ifa_addr == sa) 643 break; 644 } 645 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 646 return; 647 flags = RTF_UP; 648 ifp = ia->ia_ifa.ifa_ifp; 649 650 if ((ifp->if_flags & IFF_LOOPBACK) 651 || (ifp->if_flags & IFF_POINTOPOINT)) 652 flags |= RTF_HOST; 653 654 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 655 if (err == 0) 656 ia->ia_flags |= IFA_ROUTE; 657 break; 658 } 659 } 660 661 u_long rip_sendspace = 9216; 662 u_long rip_recvspace = 9216; 663 664 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 665 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 666 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 667 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams"); 668 669 static int 670 rip_attach(struct socket *so, int proto, struct thread *td) 671 { 672 INIT_VNET_INET(so->so_vnet); 673 struct inpcb *inp; 674 int error; 675 676 inp = sotoinpcb(so); 677 KASSERT(inp == NULL, ("rip_attach: inp != NULL")); 678 679 error = priv_check(td, PRIV_NETINET_RAW); 680 if (error) 681 return (error); 682 if (proto >= IPPROTO_MAX || proto < 0) 683 return EPROTONOSUPPORT; 684 error = soreserve(so, rip_sendspace, rip_recvspace); 685 if (error) 686 return (error); 687 INP_INFO_WLOCK(&V_ripcbinfo); 688 error = in_pcballoc(so, &V_ripcbinfo); 689 if (error) { 690 INP_INFO_WUNLOCK(&V_ripcbinfo); 691 return (error); 692 } 693 inp = (struct inpcb *)so->so_pcb; 694 inp->inp_vflag |= INP_IPV4; 695 inp->inp_ip_p = proto; 696 inp->inp_ip_ttl = V_ip_defttl; 697 rip_inshash(inp); 698 INP_INFO_WUNLOCK(&V_ripcbinfo); 699 INP_WUNLOCK(inp); 700 return (0); 701 } 702 703 static void 704 rip_detach(struct socket *so) 705 { 706 INIT_VNET_INET(so->so_vnet); 707 struct inpcb *inp; 708 709 inp = sotoinpcb(so); 710 KASSERT(inp != NULL, ("rip_detach: inp == NULL")); 711 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 712 ("rip_detach: not closed")); 713 714 INP_INFO_WLOCK(&V_ripcbinfo); 715 INP_WLOCK(inp); 716 rip_delhash(inp); 717 if (so == V_ip_mrouter && ip_mrouter_done) 718 ip_mrouter_done(); 719 if (ip_rsvp_force_done) 720 ip_rsvp_force_done(so); 721 if (so == V_ip_rsvpd) 722 ip_rsvp_done(); 723 in_pcbdetach(inp); 724 in_pcbfree(inp); 725 INP_INFO_WUNLOCK(&V_ripcbinfo); 726 } 727 728 static void 729 rip_dodisconnect(struct socket *so, struct inpcb *inp) 730 { 731 732 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 733 INP_WLOCK_ASSERT(inp); 734 735 rip_delhash(inp); 736 inp->inp_faddr.s_addr = INADDR_ANY; 737 rip_inshash(inp); 738 SOCK_LOCK(so); 739 so->so_state &= ~SS_ISCONNECTED; 740 SOCK_UNLOCK(so); 741 } 742 743 static void 744 rip_abort(struct socket *so) 745 { 746 INIT_VNET_INET(so->so_vnet); 747 struct inpcb *inp; 748 749 inp = sotoinpcb(so); 750 KASSERT(inp != NULL, ("rip_abort: inp == NULL")); 751 752 INP_INFO_WLOCK(&V_ripcbinfo); 753 INP_WLOCK(inp); 754 rip_dodisconnect(so, inp); 755 INP_WUNLOCK(inp); 756 INP_INFO_WUNLOCK(&V_ripcbinfo); 757 } 758 759 static void 760 rip_close(struct socket *so) 761 { 762 INIT_VNET_INET(so->so_vnet); 763 struct inpcb *inp; 764 765 inp = sotoinpcb(so); 766 KASSERT(inp != NULL, ("rip_close: inp == NULL")); 767 768 INP_INFO_WLOCK(&V_ripcbinfo); 769 INP_WLOCK(inp); 770 rip_dodisconnect(so, inp); 771 INP_WUNLOCK(inp); 772 INP_INFO_WUNLOCK(&V_ripcbinfo); 773 } 774 775 static int 776 rip_disconnect(struct socket *so) 777 { 778 INIT_VNET_INET(so->so_vnet); 779 struct inpcb *inp; 780 781 if ((so->so_state & SS_ISCONNECTED) == 0) 782 return (ENOTCONN); 783 784 inp = sotoinpcb(so); 785 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL")); 786 787 INP_INFO_WLOCK(&V_ripcbinfo); 788 INP_WLOCK(inp); 789 rip_dodisconnect(so, inp); 790 INP_WUNLOCK(inp); 791 INP_INFO_WUNLOCK(&V_ripcbinfo); 792 return (0); 793 } 794 795 static int 796 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 797 { 798 INIT_VNET_NET(so->so_vnet); 799 INIT_VNET_INET(so->so_vnet); 800 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 801 struct inpcb *inp; 802 int error; 803 804 if (nam->sa_len != sizeof(*addr)) 805 return (EINVAL); 806 807 error = prison_check_ip4(td->td_ucred, &addr->sin_addr); 808 if (error != 0) 809 return (error); 810 811 if (TAILQ_EMPTY(&V_ifnet) || 812 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) || 813 (addr->sin_addr.s_addr && 814 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 815 return (EADDRNOTAVAIL); 816 817 inp = sotoinpcb(so); 818 KASSERT(inp != NULL, ("rip_bind: inp == NULL")); 819 820 INP_INFO_WLOCK(&V_ripcbinfo); 821 INP_WLOCK(inp); 822 rip_delhash(inp); 823 inp->inp_laddr = addr->sin_addr; 824 rip_inshash(inp); 825 INP_WUNLOCK(inp); 826 INP_INFO_WUNLOCK(&V_ripcbinfo); 827 return (0); 828 } 829 830 static int 831 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 832 { 833 INIT_VNET_NET(so->so_vnet); 834 INIT_VNET_INET(so->so_vnet); 835 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 836 struct inpcb *inp; 837 838 if (nam->sa_len != sizeof(*addr)) 839 return (EINVAL); 840 if (TAILQ_EMPTY(&V_ifnet)) 841 return (EADDRNOTAVAIL); 842 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) 843 return (EAFNOSUPPORT); 844 845 inp = sotoinpcb(so); 846 KASSERT(inp != NULL, ("rip_connect: inp == NULL")); 847 848 INP_INFO_WLOCK(&V_ripcbinfo); 849 INP_WLOCK(inp); 850 rip_delhash(inp); 851 inp->inp_faddr = addr->sin_addr; 852 rip_inshash(inp); 853 soisconnected(so); 854 INP_WUNLOCK(inp); 855 INP_INFO_WUNLOCK(&V_ripcbinfo); 856 return (0); 857 } 858 859 static int 860 rip_shutdown(struct socket *so) 861 { 862 struct inpcb *inp; 863 864 inp = sotoinpcb(so); 865 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL")); 866 867 INP_WLOCK(inp); 868 socantsendmore(so); 869 INP_WUNLOCK(inp); 870 return (0); 871 } 872 873 static int 874 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 875 struct mbuf *control, struct thread *td) 876 { 877 struct inpcb *inp; 878 u_long dst; 879 880 inp = sotoinpcb(so); 881 KASSERT(inp != NULL, ("rip_send: inp == NULL")); 882 883 /* 884 * Note: 'dst' reads below are unlocked. 885 */ 886 if (so->so_state & SS_ISCONNECTED) { 887 if (nam) { 888 m_freem(m); 889 return (EISCONN); 890 } 891 dst = inp->inp_faddr.s_addr; /* Unlocked read. */ 892 } else { 893 if (nam == NULL) { 894 m_freem(m); 895 return (ENOTCONN); 896 } 897 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 898 } 899 return (rip_output(m, so, dst)); 900 } 901 902 static int 903 rip_pcblist(SYSCTL_HANDLER_ARGS) 904 { 905 INIT_VNET_INET(curvnet); 906 int error, i, n; 907 struct inpcb *inp, **inp_list; 908 inp_gen_t gencnt; 909 struct xinpgen xig; 910 911 /* 912 * The process of preparing the TCB list is too time-consuming and 913 * resource-intensive to repeat twice on every request. 914 */ 915 if (req->oldptr == 0) { 916 n = V_ripcbinfo.ipi_count; 917 req->oldidx = 2 * (sizeof xig) 918 + (n + n/8) * sizeof(struct xinpcb); 919 return (0); 920 } 921 922 if (req->newptr != 0) 923 return (EPERM); 924 925 /* 926 * OK, now we're committed to doing something. 927 */ 928 INP_INFO_RLOCK(&V_ripcbinfo); 929 gencnt = V_ripcbinfo.ipi_gencnt; 930 n = V_ripcbinfo.ipi_count; 931 INP_INFO_RUNLOCK(&V_ripcbinfo); 932 933 xig.xig_len = sizeof xig; 934 xig.xig_count = n; 935 xig.xig_gen = gencnt; 936 xig.xig_sogen = so_gencnt; 937 error = SYSCTL_OUT(req, &xig, sizeof xig); 938 if (error) 939 return (error); 940 941 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 942 if (inp_list == 0) 943 return (ENOMEM); 944 945 INP_INFO_RLOCK(&V_ripcbinfo); 946 for (inp = LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n; 947 inp = LIST_NEXT(inp, inp_list)) { 948 INP_RLOCK(inp); 949 if (inp->inp_gencnt <= gencnt && 950 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 951 /* XXX held references? */ 952 inp_list[i++] = inp; 953 } 954 INP_RUNLOCK(inp); 955 } 956 INP_INFO_RUNLOCK(&V_ripcbinfo); 957 n = i; 958 959 error = 0; 960 for (i = 0; i < n; i++) { 961 inp = inp_list[i]; 962 INP_RLOCK(inp); 963 if (inp->inp_gencnt <= gencnt) { 964 struct xinpcb xi; 965 966 bzero(&xi, sizeof(xi)); 967 xi.xi_len = sizeof xi; 968 /* XXX should avoid extra copy */ 969 bcopy(inp, &xi.xi_inp, sizeof *inp); 970 if (inp->inp_socket) 971 sotoxsocket(inp->inp_socket, &xi.xi_socket); 972 INP_RUNLOCK(inp); 973 error = SYSCTL_OUT(req, &xi, sizeof xi); 974 } else 975 INP_RUNLOCK(inp); 976 } 977 if (!error) { 978 /* 979 * Give the user an updated idea of our state. If the 980 * generation differs from what we told her before, she knows 981 * that something happened while we were processing this 982 * request, and it might be necessary to retry. 983 */ 984 INP_INFO_RLOCK(&V_ripcbinfo); 985 xig.xig_gen = V_ripcbinfo.ipi_gencnt; 986 xig.xig_sogen = so_gencnt; 987 xig.xig_count = V_ripcbinfo.ipi_count; 988 INP_INFO_RUNLOCK(&V_ripcbinfo); 989 error = SYSCTL_OUT(req, &xig, sizeof xig); 990 } 991 free(inp_list, M_TEMP); 992 return (error); 993 } 994 995 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 996 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 997 998 struct pr_usrreqs rip_usrreqs = { 999 .pru_abort = rip_abort, 1000 .pru_attach = rip_attach, 1001 .pru_bind = rip_bind, 1002 .pru_connect = rip_connect, 1003 .pru_control = in_control, 1004 .pru_detach = rip_detach, 1005 .pru_disconnect = rip_disconnect, 1006 .pru_peeraddr = in_getpeeraddr, 1007 .pru_send = rip_send, 1008 .pru_shutdown = rip_shutdown, 1009 .pru_sockaddr = in_getsockaddr, 1010 .pru_sosetlabel = in_pcbsosetlabel, 1011 .pru_close = rip_close, 1012 }; 1013