Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/udp_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 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 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 30 * $FreeBSD: releng/6.2/sys/netinet/udp_usrreq.c 163060 2006-10-06 20:26:06Z andre $ 31 */ 32 33 #include "opt_ipfw.h" 34 #include "opt_ipsec.h" 35 #include "opt_inet6.h" 36 #include "opt_mac.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/domain.h> 41 #include <sys/eventhandler.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sx.h> 54 #include <sys/sysctl.h> 55 #include <sys/syslog.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 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 #include <netinet/ip_icmp.h> 71 #include <netinet/icmp_var.h> 72 #include <netinet/ip_var.h> 73 #ifdef INET6 74 #include <netinet6/ip6_var.h> 75 #endif 76 #include <netinet/udp.h> 77 #include <netinet/udp_var.h> 78 79 #ifdef FAST_IPSEC 80 #include <netipsec/ipsec.h> 81 #endif /*FAST_IPSEC*/ 82 83 #ifdef IPSEC 84 #include <netinet6/ipsec.h> 85 #endif /*IPSEC*/ 86 87 #include <machine/in_cksum.h> 88 89 /* 90 * UDP protocol implementation. 91 * Per RFC 768, August, 1980. 92 */ 93 #ifndef COMPAT_42 94 static int udpcksum = 1; 95 #else 96 static int udpcksum = 0; /* XXX */ 97 #endif 98 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 99 &udpcksum, 0, ""); 100 101 int log_in_vain = 0; 102 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 103 &log_in_vain, 0, "Log all incoming UDP packets"); 104 105 static int blackhole = 0; 106 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 107 &blackhole, 0, "Do not send port unreachables for refused connects"); 108 109 static int strict_mcast_mship = 0; 110 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 111 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 112 113 struct inpcbhead udb; /* from udp_var.h */ 114 #define udb6 udb /* for KAME src sync over BSD*'s */ 115 struct inpcbinfo udbinfo; 116 117 #ifndef UDBHASHSIZE 118 #define UDBHASHSIZE 16 119 #endif 120 121 struct udpstat udpstat; /* from udp_var.h */ 122 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 123 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 124 125 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 126 int off, struct sockaddr_in *udp_in); 127 128 static int udp_detach(struct socket *so); 129 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 130 struct mbuf *, struct thread *); 131 132 static void 133 udp_zone_change(void *tag) 134 { 135 136 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 137 } 138 139 void 140 udp_init() 141 { 142 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 143 LIST_INIT(&udb); 144 udbinfo.listhead = &udb; 145 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 146 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 147 &udbinfo.porthashmask); 148 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 149 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 150 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 151 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 152 EVENTHANDLER_PRI_ANY); 153 } 154 155 void 156 udp_input(m, off) 157 register struct mbuf *m; 158 int off; 159 { 160 int iphlen = off; 161 register struct ip *ip; 162 register struct udphdr *uh; 163 register struct inpcb *inp; 164 int len; 165 struct ip save_ip; 166 struct sockaddr_in udp_in; 167 #ifdef IPFIREWALL_FORWARD 168 struct m_tag *fwd_tag; 169 #endif 170 171 udpstat.udps_ipackets++; 172 173 /* 174 * Strip IP options, if any; should skip this, 175 * make available to user, and use on returned packets, 176 * but we don't yet have a way to check the checksum 177 * with options still present. 178 */ 179 if (iphlen > sizeof (struct ip)) { 180 ip_stripoptions(m, (struct mbuf *)0); 181 iphlen = sizeof(struct ip); 182 } 183 184 /* 185 * Get IP and UDP header together in first mbuf. 186 */ 187 ip = mtod(m, struct ip *); 188 if (m->m_len < iphlen + sizeof(struct udphdr)) { 189 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 190 udpstat.udps_hdrops++; 191 return; 192 } 193 ip = mtod(m, struct ip *); 194 } 195 uh = (struct udphdr *)((caddr_t)ip + iphlen); 196 197 /* destination port of 0 is illegal, based on RFC768. */ 198 if (uh->uh_dport == 0) 199 goto badunlocked; 200 201 /* 202 * Construct sockaddr format source address. 203 * Stuff source address and datagram in user buffer. 204 */ 205 bzero(&udp_in, sizeof(udp_in)); 206 udp_in.sin_len = sizeof(udp_in); 207 udp_in.sin_family = AF_INET; 208 udp_in.sin_port = uh->uh_sport; 209 udp_in.sin_addr = ip->ip_src; 210 211 /* 212 * Make mbuf data length reflect UDP length. 213 * If not enough data to reflect UDP length, drop. 214 */ 215 len = ntohs((u_short)uh->uh_ulen); 216 if (ip->ip_len != len) { 217 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 218 udpstat.udps_badlen++; 219 goto badunlocked; 220 } 221 m_adj(m, len - ip->ip_len); 222 /* ip->ip_len = len; */ 223 } 224 /* 225 * Save a copy of the IP header in case we want restore it 226 * for sending an ICMP error message in response. 227 */ 228 if (!blackhole) 229 save_ip = *ip; 230 231 /* 232 * Checksum extended UDP header and data. 233 */ 234 if (uh->uh_sum) { 235 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 236 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 237 uh->uh_sum = m->m_pkthdr.csum_data; 238 else 239 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 240 ip->ip_dst.s_addr, htonl((u_short)len + 241 m->m_pkthdr.csum_data + IPPROTO_UDP)); 242 uh->uh_sum ^= 0xffff; 243 } else { 244 char b[9]; 245 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 246 bzero(((struct ipovly *)ip)->ih_x1, 9); 247 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 248 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 249 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 250 } 251 if (uh->uh_sum) { 252 udpstat.udps_badsum++; 253 m_freem(m); 254 return; 255 } 256 } else 257 udpstat.udps_nosum++; 258 259 #ifdef IPFIREWALL_FORWARD 260 /* Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. */ 261 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 262 263 if (fwd_tag != NULL) { 264 struct sockaddr_in *next_hop; 265 266 /* Do the hack. */ 267 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 268 ip->ip_dst = next_hop->sin_addr; 269 uh->uh_dport = ntohs(next_hop->sin_port); 270 /* Remove the tag from the packet. We don't need it anymore. */ 271 m_tag_delete(m, fwd_tag); 272 } 273 #endif 274 275 INP_INFO_RLOCK(&udbinfo); 276 277 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 278 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 279 struct inpcb *last; 280 /* 281 * Deliver a multicast or broadcast datagram to *all* sockets 282 * for which the local and remote addresses and ports match 283 * those of the incoming datagram. This allows more than 284 * one process to receive multi/broadcasts on the same port. 285 * (This really ought to be done for unicast datagrams as 286 * well, but that would cause problems with existing 287 * applications that open both address-specific sockets and 288 * a wildcard socket listening to the same port -- they would 289 * end up receiving duplicates of every unicast datagram. 290 * Those applications open the multiple sockets to overcome an 291 * inadequacy of the UDP socket interface, but for backwards 292 * compatibility we avoid the problem here rather than 293 * fixing the interface. Maybe 4.5BSD will remedy this?) 294 */ 295 296 /* 297 * Locate pcb(s) for datagram. 298 * (Algorithm copied from raw_intr().) 299 */ 300 last = NULL; 301 LIST_FOREACH(inp, &udb, inp_list) { 302 if (inp->inp_lport != uh->uh_dport) 303 continue; 304 #ifdef INET6 305 if ((inp->inp_vflag & INP_IPV4) == 0) 306 continue; 307 #endif 308 if (inp->inp_laddr.s_addr != INADDR_ANY) { 309 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 310 continue; 311 } 312 if (inp->inp_faddr.s_addr != INADDR_ANY) { 313 if (inp->inp_faddr.s_addr != 314 ip->ip_src.s_addr || 315 inp->inp_fport != uh->uh_sport) 316 continue; 317 } 318 INP_LOCK(inp); 319 320 /* 321 * Check multicast packets to make sure they are only 322 * sent to sockets with multicast memberships for the 323 * packet's destination address and arrival interface 324 */ 325 #define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)]) 326 #define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships) 327 if (strict_mcast_mship && inp->inp_moptions != NULL) { 328 int mship, foundmship = 0; 329 330 for (mship = 0; mship < NMSHIPS(inp); mship++) { 331 if (MSHIP(inp, mship)->inm_addr.s_addr 332 == ip->ip_dst.s_addr && 333 MSHIP(inp, mship)->inm_ifp 334 == m->m_pkthdr.rcvif) { 335 foundmship = 1; 336 break; 337 } 338 } 339 if (foundmship == 0) { 340 INP_UNLOCK(inp); 341 continue; 342 } 343 } 344 #undef NMSHIPS 345 #undef MSHIP 346 if (last != NULL) { 347 struct mbuf *n; 348 349 n = m_copy(m, 0, M_COPYALL); 350 if (n != NULL) 351 udp_append(last, ip, n, 352 iphlen + 353 sizeof(struct udphdr), 354 &udp_in); 355 INP_UNLOCK(last); 356 } 357 last = inp; 358 /* 359 * Don't look for additional matches if this one does 360 * not have either the SO_REUSEPORT or SO_REUSEADDR 361 * socket options set. This heuristic avoids searching 362 * through all pcbs in the common case of a non-shared 363 * port. It * assumes that an application will never 364 * clear these options after setting them. 365 */ 366 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 367 break; 368 } 369 370 if (last == NULL) { 371 /* 372 * No matching pcb found; discard datagram. 373 * (No need to send an ICMP Port Unreachable 374 * for a broadcast or multicast datgram.) 375 */ 376 udpstat.udps_noportbcast++; 377 goto badheadlocked; 378 } 379 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 380 &udp_in); 381 INP_UNLOCK(last); 382 INP_INFO_RUNLOCK(&udbinfo); 383 return; 384 } 385 /* 386 * Locate pcb for datagram. 387 */ 388 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 389 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 390 if (inp == NULL) { 391 if (log_in_vain) { 392 char buf[4*sizeof "123"]; 393 394 strcpy(buf, inet_ntoa(ip->ip_dst)); 395 log(LOG_INFO, 396 "Connection attempt to UDP %s:%d from %s:%d\n", 397 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 398 ntohs(uh->uh_sport)); 399 } 400 udpstat.udps_noport++; 401 if (m->m_flags & (M_BCAST | M_MCAST)) { 402 udpstat.udps_noportbcast++; 403 goto badheadlocked; 404 } 405 if (blackhole) 406 goto badheadlocked; 407 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 408 goto badheadlocked; 409 *ip = save_ip; 410 ip->ip_len += iphlen; 411 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 412 INP_INFO_RUNLOCK(&udbinfo); 413 return; 414 } 415 INP_LOCK(inp); 416 /* Check the minimum TTL for socket. */ 417 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) 418 goto badheadlocked; 419 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 420 INP_UNLOCK(inp); 421 INP_INFO_RUNLOCK(&udbinfo); 422 return; 423 424 badheadlocked: 425 if (inp) 426 INP_UNLOCK(inp); 427 INP_INFO_RUNLOCK(&udbinfo); 428 badunlocked: 429 m_freem(m); 430 return; 431 } 432 433 /* 434 * Subroutine of udp_input(), which appends the provided mbuf chain to the 435 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 436 * contains the source address. If the socket ends up being an IPv6 socket, 437 * udp_append() will convert to a sockaddr_in6 before passing the address 438 * into the socket code. 439 */ 440 static void 441 udp_append(last, ip, n, off, udp_in) 442 struct inpcb *last; 443 struct ip *ip; 444 struct mbuf *n; 445 int off; 446 struct sockaddr_in *udp_in; 447 { 448 struct sockaddr *append_sa; 449 struct socket *so; 450 struct mbuf *opts = 0; 451 #ifdef INET6 452 struct sockaddr_in6 udp_in6; 453 #endif 454 455 INP_LOCK_ASSERT(last); 456 457 #if defined(IPSEC) || defined(FAST_IPSEC) 458 /* check AH/ESP integrity. */ 459 if (ipsec4_in_reject(n, last)) { 460 #ifdef IPSEC 461 ipsecstat.in_polvio++; 462 #endif /*IPSEC*/ 463 m_freem(n); 464 return; 465 } 466 #endif /*IPSEC || FAST_IPSEC*/ 467 #ifdef MAC 468 if (mac_check_inpcb_deliver(last, n) != 0) { 469 m_freem(n); 470 return; 471 } 472 #endif 473 if (last->inp_flags & INP_CONTROLOPTS || 474 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 475 #ifdef INET6 476 if (last->inp_vflag & INP_IPV6) { 477 int savedflags; 478 479 savedflags = last->inp_flags; 480 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 481 ip6_savecontrol(last, n, &opts); 482 last->inp_flags = savedflags; 483 } else 484 #endif 485 ip_savecontrol(last, &opts, ip, n); 486 } 487 #ifdef INET6 488 if (last->inp_vflag & INP_IPV6) { 489 bzero(&udp_in6, sizeof(udp_in6)); 490 udp_in6.sin6_len = sizeof(udp_in6); 491 udp_in6.sin6_family = AF_INET6; 492 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 493 append_sa = (struct sockaddr *)&udp_in6; 494 } else 495 #endif 496 append_sa = (struct sockaddr *)udp_in; 497 m_adj(n, off); 498 499 so = last->inp_socket; 500 SOCKBUF_LOCK(&so->so_rcv); 501 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 502 m_freem(n); 503 if (opts) 504 m_freem(opts); 505 udpstat.udps_fullsock++; 506 SOCKBUF_UNLOCK(&so->so_rcv); 507 } else 508 sorwakeup_locked(so); 509 } 510 511 /* 512 * Notify a udp user of an asynchronous error; 513 * just wake up so that he can collect error status. 514 */ 515 struct inpcb * 516 udp_notify(inp, errno) 517 register struct inpcb *inp; 518 int errno; 519 { 520 inp->inp_socket->so_error = errno; 521 sorwakeup(inp->inp_socket); 522 sowwakeup(inp->inp_socket); 523 return inp; 524 } 525 526 void 527 udp_ctlinput(cmd, sa, vip) 528 int cmd; 529 struct sockaddr *sa; 530 void *vip; 531 { 532 struct ip *ip = vip; 533 struct udphdr *uh; 534 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 535 struct in_addr faddr; 536 struct inpcb *inp; 537 538 faddr = ((struct sockaddr_in *)sa)->sin_addr; 539 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 540 return; 541 542 /* 543 * Redirects don't need to be handled up here. 544 */ 545 if (PRC_IS_REDIRECT(cmd)) 546 return; 547 /* 548 * Hostdead is ugly because it goes linearly through all PCBs. 549 * XXX: We never get this from ICMP, otherwise it makes an 550 * excellent DoS attack on machines with many connections. 551 */ 552 if (cmd == PRC_HOSTDEAD) 553 ip = 0; 554 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 555 return; 556 if (ip) { 557 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 558 INP_INFO_RLOCK(&udbinfo); 559 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 560 ip->ip_src, uh->uh_sport, 0, NULL); 561 if (inp != NULL) { 562 INP_LOCK(inp); 563 if (inp->inp_socket != NULL) { 564 (*notify)(inp, inetctlerrmap[cmd]); 565 } 566 INP_UNLOCK(inp); 567 } 568 INP_INFO_RUNLOCK(&udbinfo); 569 } else 570 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 571 } 572 573 static int 574 udp_pcblist(SYSCTL_HANDLER_ARGS) 575 { 576 int error, i, n; 577 struct inpcb *inp, **inp_list; 578 inp_gen_t gencnt; 579 struct xinpgen xig; 580 581 /* 582 * The process of preparing the TCB list is too time-consuming and 583 * resource-intensive to repeat twice on every request. 584 */ 585 if (req->oldptr == 0) { 586 n = udbinfo.ipi_count; 587 req->oldidx = 2 * (sizeof xig) 588 + (n + n/8) * sizeof(struct xinpcb); 589 return 0; 590 } 591 592 if (req->newptr != 0) 593 return EPERM; 594 595 /* 596 * OK, now we're committed to doing something. 597 */ 598 INP_INFO_RLOCK(&udbinfo); 599 gencnt = udbinfo.ipi_gencnt; 600 n = udbinfo.ipi_count; 601 INP_INFO_RUNLOCK(&udbinfo); 602 603 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 604 + n * sizeof(struct xinpcb)); 605 if (error != 0) 606 return (error); 607 608 xig.xig_len = sizeof xig; 609 xig.xig_count = n; 610 xig.xig_gen = gencnt; 611 xig.xig_sogen = so_gencnt; 612 error = SYSCTL_OUT(req, &xig, sizeof xig); 613 if (error) 614 return error; 615 616 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 617 if (inp_list == 0) 618 return ENOMEM; 619 620 INP_INFO_RLOCK(&udbinfo); 621 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 622 inp = LIST_NEXT(inp, inp_list)) { 623 INP_LOCK(inp); 624 if (inp->inp_gencnt <= gencnt && 625 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 626 inp_list[i++] = inp; 627 INP_UNLOCK(inp); 628 } 629 INP_INFO_RUNLOCK(&udbinfo); 630 n = i; 631 632 error = 0; 633 for (i = 0; i < n; i++) { 634 inp = inp_list[i]; 635 if (inp->inp_gencnt <= gencnt) { 636 struct xinpcb xi; 637 bzero(&xi, sizeof(xi)); 638 xi.xi_len = sizeof xi; 639 /* XXX should avoid extra copy */ 640 bcopy(inp, &xi.xi_inp, sizeof *inp); 641 if (inp->inp_socket) 642 sotoxsocket(inp->inp_socket, &xi.xi_socket); 643 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 644 error = SYSCTL_OUT(req, &xi, sizeof xi); 645 } 646 } 647 if (!error) { 648 /* 649 * Give the user an updated idea of our state. 650 * If the generation differs from what we told 651 * her before, she knows that something happened 652 * while we were processing this request, and it 653 * might be necessary to retry. 654 */ 655 INP_INFO_RLOCK(&udbinfo); 656 xig.xig_gen = udbinfo.ipi_gencnt; 657 xig.xig_sogen = so_gencnt; 658 xig.xig_count = udbinfo.ipi_count; 659 INP_INFO_RUNLOCK(&udbinfo); 660 error = SYSCTL_OUT(req, &xig, sizeof xig); 661 } 662 free(inp_list, M_TEMP); 663 return error; 664 } 665 666 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 667 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 668 669 static int 670 udp_getcred(SYSCTL_HANDLER_ARGS) 671 { 672 struct xucred xuc; 673 struct sockaddr_in addrs[2]; 674 struct inpcb *inp; 675 int error; 676 677 error = suser_cred(req->td->td_ucred, SUSER_ALLOWJAIL); 678 if (error) 679 return (error); 680 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 681 if (error) 682 return (error); 683 INP_INFO_RLOCK(&udbinfo); 684 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 685 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 686 if (inp == NULL || inp->inp_socket == NULL) { 687 error = ENOENT; 688 goto out; 689 } 690 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 691 if (error) 692 goto out; 693 cru2x(inp->inp_socket->so_cred, &xuc); 694 out: 695 INP_INFO_RUNLOCK(&udbinfo); 696 if (error == 0) 697 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 698 return (error); 699 } 700 701 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 702 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 703 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 704 705 static int 706 udp_output(inp, m, addr, control, td) 707 register struct inpcb *inp; 708 struct mbuf *m; 709 struct sockaddr *addr; 710 struct mbuf *control; 711 struct thread *td; 712 { 713 register struct udpiphdr *ui; 714 register int len = m->m_pkthdr.len; 715 struct in_addr faddr, laddr; 716 struct cmsghdr *cm; 717 struct sockaddr_in *sin, src; 718 int error = 0; 719 int ipflags; 720 u_short fport, lport; 721 int unlock_udbinfo; 722 723 /* 724 * udp_output() may need to temporarily bind or connect the current 725 * inpcb. As such, we don't know up front what inpcb locks we will 726 * need. Do any work to decide what is needed up front before 727 * acquiring locks. 728 */ 729 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 730 if (control) 731 m_freem(control); 732 m_freem(m); 733 return EMSGSIZE; 734 } 735 736 src.sin_addr.s_addr = INADDR_ANY; 737 if (control != NULL) { 738 /* 739 * XXX: Currently, we assume all the optional information 740 * is stored in a single mbuf. 741 */ 742 if (control->m_next) { 743 m_freem(control); 744 m_freem(m); 745 return EINVAL; 746 } 747 for (; control->m_len > 0; 748 control->m_data += CMSG_ALIGN(cm->cmsg_len), 749 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 750 cm = mtod(control, struct cmsghdr *); 751 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 752 cm->cmsg_len > control->m_len) { 753 error = EINVAL; 754 break; 755 } 756 if (cm->cmsg_level != IPPROTO_IP) 757 continue; 758 759 switch (cm->cmsg_type) { 760 case IP_SENDSRCADDR: 761 if (cm->cmsg_len != 762 CMSG_LEN(sizeof(struct in_addr))) { 763 error = EINVAL; 764 break; 765 } 766 bzero(&src, sizeof(src)); 767 src.sin_family = AF_INET; 768 src.sin_len = sizeof(src); 769 src.sin_port = inp->inp_lport; 770 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 771 break; 772 default: 773 error = ENOPROTOOPT; 774 break; 775 } 776 if (error) 777 break; 778 } 779 m_freem(control); 780 } 781 if (error) { 782 m_freem(m); 783 return error; 784 } 785 786 if (src.sin_addr.s_addr != INADDR_ANY || 787 addr != NULL) { 788 INP_INFO_WLOCK(&udbinfo); 789 unlock_udbinfo = 1; 790 } else 791 unlock_udbinfo = 0; 792 INP_LOCK(inp); 793 794 #ifdef MAC 795 mac_create_mbuf_from_inpcb(inp, m); 796 #endif 797 798 laddr = inp->inp_laddr; 799 lport = inp->inp_lport; 800 if (src.sin_addr.s_addr != INADDR_ANY) { 801 if (lport == 0) { 802 error = EINVAL; 803 goto release; 804 } 805 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 806 &laddr.s_addr, &lport, td->td_ucred); 807 if (error) 808 goto release; 809 } 810 811 if (addr) { 812 sin = (struct sockaddr_in *)addr; 813 if (jailed(td->td_ucred)) 814 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 815 if (inp->inp_faddr.s_addr != INADDR_ANY) { 816 error = EISCONN; 817 goto release; 818 } 819 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 820 &faddr.s_addr, &fport, NULL, td->td_ucred); 821 if (error) 822 goto release; 823 824 /* Commit the local port if newly assigned. */ 825 if (inp->inp_laddr.s_addr == INADDR_ANY && 826 inp->inp_lport == 0) { 827 /* 828 * Remember addr if jailed, to prevent rebinding. 829 */ 830 if (jailed(td->td_ucred)) 831 inp->inp_laddr = laddr; 832 inp->inp_lport = lport; 833 if (in_pcbinshash(inp) != 0) { 834 inp->inp_lport = 0; 835 error = EAGAIN; 836 goto release; 837 } 838 inp->inp_flags |= INP_ANONPORT; 839 } 840 } else { 841 faddr = inp->inp_faddr; 842 fport = inp->inp_fport; 843 if (faddr.s_addr == INADDR_ANY) { 844 error = ENOTCONN; 845 goto release; 846 } 847 } 848 849 /* 850 * Calculate data length and get a mbuf for UDP, IP, and possible 851 * link-layer headers. Immediate slide the data pointer back forward 852 * since we won't use that space at this layer. 853 */ 854 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 855 if (m == NULL) { 856 error = ENOBUFS; 857 goto release; 858 } 859 m->m_data += max_linkhdr; 860 m->m_len -= max_linkhdr; 861 m->m_pkthdr.len -= max_linkhdr; 862 863 /* 864 * Fill in mbuf with extended UDP header 865 * and addresses and length put into network format. 866 */ 867 ui = mtod(m, struct udpiphdr *); 868 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 869 ui->ui_pr = IPPROTO_UDP; 870 ui->ui_src = laddr; 871 ui->ui_dst = faddr; 872 ui->ui_sport = lport; 873 ui->ui_dport = fport; 874 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 875 876 /* 877 * Set the Don't Fragment bit in the IP header. 878 */ 879 if (inp->inp_flags & INP_DONTFRAG) { 880 struct ip *ip; 881 ip = (struct ip *)&ui->ui_i; 882 ip->ip_off |= IP_DF; 883 } 884 885 ipflags = 0; 886 if (inp->inp_socket->so_options & SO_DONTROUTE) 887 ipflags |= IP_ROUTETOIF; 888 if (inp->inp_socket->so_options & SO_BROADCAST) 889 ipflags |= IP_ALLOWBROADCAST; 890 if (inp->inp_flags & INP_ONESBCAST) 891 ipflags |= IP_SENDONES; 892 893 /* 894 * Set up checksum and output datagram. 895 */ 896 if (udpcksum) { 897 if (inp->inp_flags & INP_ONESBCAST) 898 faddr.s_addr = INADDR_BROADCAST; 899 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 900 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 901 m->m_pkthdr.csum_flags = CSUM_UDP; 902 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 903 } else { 904 ui->ui_sum = 0; 905 } 906 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 907 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 908 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 909 udpstat.udps_opackets++; 910 911 if (unlock_udbinfo) 912 INP_INFO_WUNLOCK(&udbinfo); 913 error = ip_output(m, inp->inp_options, NULL, ipflags, 914 inp->inp_moptions, inp); 915 INP_UNLOCK(inp); 916 return (error); 917 918 release: 919 INP_UNLOCK(inp); 920 if (unlock_udbinfo) 921 INP_INFO_WUNLOCK(&udbinfo); 922 m_freem(m); 923 return (error); 924 } 925 926 u_long udp_sendspace = 9216; /* really max datagram size */ 927 /* 40 1K datagrams */ 928 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 929 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 930 931 u_long udp_recvspace = 40 * (1024 + 932 #ifdef INET6 933 sizeof(struct sockaddr_in6) 934 #else 935 sizeof(struct sockaddr_in) 936 #endif 937 ); 938 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 939 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 940 941 static int 942 udp_abort(struct socket *so) 943 { 944 struct inpcb *inp; 945 946 INP_INFO_WLOCK(&udbinfo); 947 inp = sotoinpcb(so); 948 if (inp == 0) { 949 INP_INFO_WUNLOCK(&udbinfo); 950 return EINVAL; /* ??? possible? panic instead? */ 951 } 952 INP_LOCK(inp); 953 soisdisconnected(so); 954 in_pcbdetach(inp); 955 INP_INFO_WUNLOCK(&udbinfo); 956 return 0; 957 } 958 959 static int 960 udp_attach(struct socket *so, int proto, struct thread *td) 961 { 962 struct inpcb *inp; 963 int error; 964 965 INP_INFO_WLOCK(&udbinfo); 966 inp = sotoinpcb(so); 967 if (inp != 0) { 968 INP_INFO_WUNLOCK(&udbinfo); 969 return EINVAL; 970 } 971 error = soreserve(so, udp_sendspace, udp_recvspace); 972 if (error) { 973 INP_INFO_WUNLOCK(&udbinfo); 974 return error; 975 } 976 error = in_pcballoc(so, &udbinfo, "udpinp"); 977 if (error) { 978 INP_INFO_WUNLOCK(&udbinfo); 979 return error; 980 } 981 982 inp = (struct inpcb *)so->so_pcb; 983 INP_LOCK(inp); 984 INP_INFO_WUNLOCK(&udbinfo); 985 inp->inp_vflag |= INP_IPV4; 986 inp->inp_ip_ttl = ip_defttl; 987 INP_UNLOCK(inp); 988 return 0; 989 } 990 991 static int 992 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 993 { 994 struct inpcb *inp; 995 int error; 996 997 INP_INFO_WLOCK(&udbinfo); 998 inp = sotoinpcb(so); 999 if (inp == 0) { 1000 INP_INFO_WUNLOCK(&udbinfo); 1001 return EINVAL; 1002 } 1003 INP_LOCK(inp); 1004 error = in_pcbbind(inp, nam, td->td_ucred); 1005 INP_UNLOCK(inp); 1006 INP_INFO_WUNLOCK(&udbinfo); 1007 return error; 1008 } 1009 1010 static int 1011 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1012 { 1013 struct inpcb *inp; 1014 int error; 1015 struct sockaddr_in *sin; 1016 1017 INP_INFO_WLOCK(&udbinfo); 1018 inp = sotoinpcb(so); 1019 if (inp == 0) { 1020 INP_INFO_WUNLOCK(&udbinfo); 1021 return EINVAL; 1022 } 1023 INP_LOCK(inp); 1024 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1025 INP_UNLOCK(inp); 1026 INP_INFO_WUNLOCK(&udbinfo); 1027 return EISCONN; 1028 } 1029 sin = (struct sockaddr_in *)nam; 1030 if (jailed(td->td_ucred)) 1031 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 1032 error = in_pcbconnect(inp, nam, td->td_ucred); 1033 if (error == 0) 1034 soisconnected(so); 1035 INP_UNLOCK(inp); 1036 INP_INFO_WUNLOCK(&udbinfo); 1037 return error; 1038 } 1039 1040 static int 1041 udp_detach(struct socket *so) 1042 { 1043 struct inpcb *inp; 1044 1045 INP_INFO_WLOCK(&udbinfo); 1046 inp = sotoinpcb(so); 1047 if (inp == 0) { 1048 INP_INFO_WUNLOCK(&udbinfo); 1049 return EINVAL; 1050 } 1051 INP_LOCK(inp); 1052 in_pcbdetach(inp); 1053 INP_INFO_WUNLOCK(&udbinfo); 1054 return 0; 1055 } 1056 1057 static int 1058 udp_disconnect(struct socket *so) 1059 { 1060 struct inpcb *inp; 1061 1062 INP_INFO_WLOCK(&udbinfo); 1063 inp = sotoinpcb(so); 1064 if (inp == 0) { 1065 INP_INFO_WUNLOCK(&udbinfo); 1066 return EINVAL; 1067 } 1068 INP_LOCK(inp); 1069 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1070 INP_INFO_WUNLOCK(&udbinfo); 1071 INP_UNLOCK(inp); 1072 return ENOTCONN; 1073 } 1074 1075 in_pcbdisconnect(inp); 1076 inp->inp_laddr.s_addr = INADDR_ANY; 1077 INP_UNLOCK(inp); 1078 INP_INFO_WUNLOCK(&udbinfo); 1079 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1080 return 0; 1081 } 1082 1083 static int 1084 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1085 struct mbuf *control, struct thread *td) 1086 { 1087 struct inpcb *inp; 1088 1089 inp = sotoinpcb(so); 1090 return udp_output(inp, m, addr, control, td); 1091 } 1092 1093 int 1094 udp_shutdown(struct socket *so) 1095 { 1096 struct inpcb *inp; 1097 1098 INP_INFO_RLOCK(&udbinfo); 1099 inp = sotoinpcb(so); 1100 if (inp == 0) { 1101 INP_INFO_RUNLOCK(&udbinfo); 1102 return EINVAL; 1103 } 1104 INP_LOCK(inp); 1105 INP_INFO_RUNLOCK(&udbinfo); 1106 socantsendmore(so); 1107 INP_UNLOCK(inp); 1108 return 0; 1109 } 1110 1111 /* 1112 * This is the wrapper function for in_setsockaddr. We just pass down 1113 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1114 * here because in_setsockaddr will call malloc and might block. 1115 */ 1116 static int 1117 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1118 { 1119 return (in_setsockaddr(so, nam, &udbinfo)); 1120 } 1121 1122 /* 1123 * This is the wrapper function for in_setpeeraddr. We just pass down 1124 * the pcbinfo for in_setpeeraddr to lock. 1125 */ 1126 static int 1127 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1128 { 1129 return (in_setpeeraddr(so, nam, &udbinfo)); 1130 } 1131 1132 struct pr_usrreqs udp_usrreqs = { 1133 .pru_abort = udp_abort, 1134 .pru_attach = udp_attach, 1135 .pru_bind = udp_bind, 1136 .pru_connect = udp_connect, 1137 .pru_control = in_control, 1138 .pru_detach = udp_detach, 1139 .pru_disconnect = udp_disconnect, 1140 .pru_peeraddr = udp_peeraddr, 1141 .pru_send = udp_send, 1142 .pru_shutdown = udp_shutdown, 1143 .pru_sockaddr = udp_sockaddr, 1144 .pru_sosetlabel = in_pcbsosetlabel 1145 };
Cache object: 4faa5d460e25c40e0365466dca3f33e1
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