Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/udp_usrreq.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/6.1/sys/netinet/udp_usrreq.c 155694 2006-02-14 21:40:21Z rwatson $ 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/jail.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.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/syslog.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 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif 69 #include <netinet/ip_icmp.h> 70 #include <netinet/icmp_var.h> 71 #include <netinet/ip_var.h> 72 #ifdef INET6 73 #include <netinet6/ip6_var.h> 74 #endif 75 #include <netinet/udp.h> 76 #include <netinet/udp_var.h> 77 78 #ifdef FAST_IPSEC 79 #include <netipsec/ipsec.h> 80 #endif /*FAST_IPSEC*/ 81 82 #ifdef IPSEC 83 #include <netinet6/ipsec.h> 84 #endif /*IPSEC*/ 85 86 #include <machine/in_cksum.h> 87 88 /* 89 * UDP protocol implementation. 90 * Per RFC 768, August, 1980. 91 */ 92 #ifndef COMPAT_42 93 static int udpcksum = 1; 94 #else 95 static int udpcksum = 0; /* XXX */ 96 #endif 97 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 98 &udpcksum, 0, ""); 99 100 int log_in_vain = 0; 101 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 102 &log_in_vain, 0, "Log all incoming UDP packets"); 103 104 static int blackhole = 0; 105 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 106 &blackhole, 0, "Do not send port unreachables for refused connects"); 107 108 static int strict_mcast_mship = 0; 109 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW, 110 &strict_mcast_mship, 0, "Only send multicast to member sockets"); 111 112 struct inpcbhead udb; /* from udp_var.h */ 113 #define udb6 udb /* for KAME src sync over BSD*'s */ 114 struct inpcbinfo udbinfo; 115 116 #ifndef UDBHASHSIZE 117 #define UDBHASHSIZE 16 118 #endif 119 120 struct udpstat udpstat; /* from udp_var.h */ 121 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 122 &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 123 124 static void udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, 125 int off, struct sockaddr_in *udp_in); 126 127 static int udp_detach(struct socket *so); 128 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 129 struct mbuf *, struct thread *); 130 131 void 132 udp_init() 133 { 134 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 135 LIST_INIT(&udb); 136 udbinfo.listhead = &udb; 137 udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); 138 udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, 139 &udbinfo.porthashmask); 140 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 141 NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 142 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 143 } 144 145 void 146 udp_input(m, off) 147 register struct mbuf *m; 148 int off; 149 { 150 int iphlen = off; 151 register struct ip *ip; 152 register struct udphdr *uh; 153 register struct inpcb *inp; 154 int len; 155 struct ip save_ip; 156 struct sockaddr_in udp_in; 157 #ifdef IPFIREWALL_FORWARD 158 struct m_tag *fwd_tag; 159 #endif 160 161 udpstat.udps_ipackets++; 162 163 /* 164 * Strip IP options, if any; should skip this, 165 * make available to user, and use on returned packets, 166 * but we don't yet have a way to check the checksum 167 * with options still present. 168 */ 169 if (iphlen > sizeof (struct ip)) { 170 ip_stripoptions(m, (struct mbuf *)0); 171 iphlen = sizeof(struct ip); 172 } 173 174 /* 175 * Get IP and UDP header together in first mbuf. 176 */ 177 ip = mtod(m, struct ip *); 178 if (m->m_len < iphlen + sizeof(struct udphdr)) { 179 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 180 udpstat.udps_hdrops++; 181 return; 182 } 183 ip = mtod(m, struct ip *); 184 } 185 uh = (struct udphdr *)((caddr_t)ip + iphlen); 186 187 /* destination port of 0 is illegal, based on RFC768. */ 188 if (uh->uh_dport == 0) 189 goto badunlocked; 190 191 /* 192 * Construct sockaddr format source address. 193 * Stuff source address and datagram in user buffer. 194 */ 195 bzero(&udp_in, sizeof(udp_in)); 196 udp_in.sin_len = sizeof(udp_in); 197 udp_in.sin_family = AF_INET; 198 udp_in.sin_port = uh->uh_sport; 199 udp_in.sin_addr = ip->ip_src; 200 201 /* 202 * Make mbuf data length reflect UDP length. 203 * If not enough data to reflect UDP length, drop. 204 */ 205 len = ntohs((u_short)uh->uh_ulen); 206 if (ip->ip_len != len) { 207 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 208 udpstat.udps_badlen++; 209 goto badunlocked; 210 } 211 m_adj(m, len - ip->ip_len); 212 /* ip->ip_len = len; */ 213 } 214 /* 215 * Save a copy of the IP header in case we want restore it 216 * for sending an ICMP error message in response. 217 */ 218 if (!blackhole) 219 save_ip = *ip; 220 221 /* 222 * Checksum extended UDP header and data. 223 */ 224 if (uh->uh_sum) { 225 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 226 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 227 uh->uh_sum = m->m_pkthdr.csum_data; 228 else 229 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, 230 ip->ip_dst.s_addr, htonl((u_short)len + 231 m->m_pkthdr.csum_data + IPPROTO_UDP)); 232 uh->uh_sum ^= 0xffff; 233 } else { 234 char b[9]; 235 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 236 bzero(((struct ipovly *)ip)->ih_x1, 9); 237 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 238 uh->uh_sum = in_cksum(m, len + sizeof (struct ip)); 239 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 240 } 241 if (uh->uh_sum) { 242 udpstat.udps_badsum++; 243 m_freem(m); 244 return; 245 } 246 } else 247 udpstat.udps_nosum++; 248 249 #ifdef IPFIREWALL_FORWARD 250 /* Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. */ 251 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 252 253 if (fwd_tag != NULL) { 254 struct sockaddr_in *next_hop; 255 256 /* Do the hack. */ 257 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 258 ip->ip_dst = next_hop->sin_addr; 259 uh->uh_dport = ntohs(next_hop->sin_port); 260 /* Remove the tag from the packet. We don't need it anymore. */ 261 m_tag_delete(m, fwd_tag); 262 } 263 #endif 264 265 INP_INFO_RLOCK(&udbinfo); 266 267 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 268 in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 269 struct inpcb *last; 270 /* 271 * Deliver a multicast or broadcast datagram to *all* sockets 272 * for which the local and remote addresses and ports match 273 * those of the incoming datagram. This allows more than 274 * one process to receive multi/broadcasts on the same port. 275 * (This really ought to be done for unicast datagrams as 276 * well, but that would cause problems with existing 277 * applications that open both address-specific sockets and 278 * a wildcard socket listening to the same port -- they would 279 * end up receiving duplicates of every unicast datagram. 280 * Those applications open the multiple sockets to overcome an 281 * inadequacy of the UDP socket interface, but for backwards 282 * compatibility we avoid the problem here rather than 283 * fixing the interface. Maybe 4.5BSD will remedy this?) 284 */ 285 286 /* 287 * Locate pcb(s) for datagram. 288 * (Algorithm copied from raw_intr().) 289 */ 290 last = NULL; 291 LIST_FOREACH(inp, &udb, inp_list) { 292 if (inp->inp_lport != uh->uh_dport) 293 continue; 294 #ifdef INET6 295 if ((inp->inp_vflag & INP_IPV4) == 0) 296 continue; 297 #endif 298 if (inp->inp_laddr.s_addr != INADDR_ANY) { 299 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 300 continue; 301 } 302 if (inp->inp_faddr.s_addr != INADDR_ANY) { 303 if (inp->inp_faddr.s_addr != 304 ip->ip_src.s_addr || 305 inp->inp_fport != uh->uh_sport) 306 continue; 307 } 308 INP_LOCK(inp); 309 310 /* 311 * Check multicast packets to make sure they are only 312 * sent to sockets with multicast memberships for the 313 * packet's destination address and arrival interface 314 */ 315 #define MSHIP(_inp, n) ((_inp)->inp_moptions->imo_membership[(n)]) 316 #define NMSHIPS(_inp) ((_inp)->inp_moptions->imo_num_memberships) 317 if (strict_mcast_mship && inp->inp_moptions != NULL) { 318 int mship, foundmship = 0; 319 320 for (mship = 0; mship < NMSHIPS(inp); mship++) { 321 if (MSHIP(inp, mship)->inm_addr.s_addr 322 == ip->ip_dst.s_addr && 323 MSHIP(inp, mship)->inm_ifp 324 == m->m_pkthdr.rcvif) { 325 foundmship = 1; 326 break; 327 } 328 } 329 if (foundmship == 0) { 330 INP_UNLOCK(inp); 331 continue; 332 } 333 } 334 #undef NMSHIPS 335 #undef MSHIP 336 if (last != NULL) { 337 struct mbuf *n; 338 339 n = m_copy(m, 0, M_COPYALL); 340 if (n != NULL) 341 udp_append(last, ip, n, 342 iphlen + 343 sizeof(struct udphdr), 344 &udp_in); 345 INP_UNLOCK(last); 346 } 347 last = inp; 348 /* 349 * Don't look for additional matches if this one does 350 * not have either the SO_REUSEPORT or SO_REUSEADDR 351 * socket options set. This heuristic avoids searching 352 * through all pcbs in the common case of a non-shared 353 * port. It * assumes that an application will never 354 * clear these options after setting them. 355 */ 356 if ((last->inp_socket->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) 357 break; 358 } 359 360 if (last == NULL) { 361 /* 362 * No matching pcb found; discard datagram. 363 * (No need to send an ICMP Port Unreachable 364 * for a broadcast or multicast datgram.) 365 */ 366 udpstat.udps_noportbcast++; 367 goto badheadlocked; 368 } 369 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 370 &udp_in); 371 INP_UNLOCK(last); 372 INP_INFO_RUNLOCK(&udbinfo); 373 return; 374 } 375 /* 376 * Locate pcb for datagram. 377 */ 378 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 379 ip->ip_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); 380 if (inp == NULL) { 381 if (log_in_vain) { 382 char buf[4*sizeof "123"]; 383 384 strcpy(buf, inet_ntoa(ip->ip_dst)); 385 log(LOG_INFO, 386 "Connection attempt to UDP %s:%d from %s:%d\n", 387 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 388 ntohs(uh->uh_sport)); 389 } 390 udpstat.udps_noport++; 391 if (m->m_flags & (M_BCAST | M_MCAST)) { 392 udpstat.udps_noportbcast++; 393 goto badheadlocked; 394 } 395 if (blackhole) 396 goto badheadlocked; 397 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 398 goto badheadlocked; 399 *ip = save_ip; 400 ip->ip_len += iphlen; 401 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 402 INP_INFO_RUNLOCK(&udbinfo); 403 return; 404 } 405 INP_LOCK(inp); 406 /* Check the minimum TTL for socket. */ 407 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) 408 goto badheadlocked; 409 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 410 INP_UNLOCK(inp); 411 INP_INFO_RUNLOCK(&udbinfo); 412 return; 413 414 badheadlocked: 415 if (inp) 416 INP_UNLOCK(inp); 417 INP_INFO_RUNLOCK(&udbinfo); 418 badunlocked: 419 m_freem(m); 420 return; 421 } 422 423 /* 424 * Subroutine of udp_input(), which appends the provided mbuf chain to the 425 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 426 * contains the source address. If the socket ends up being an IPv6 socket, 427 * udp_append() will convert to a sockaddr_in6 before passing the address 428 * into the socket code. 429 */ 430 static void 431 udp_append(last, ip, n, off, udp_in) 432 struct inpcb *last; 433 struct ip *ip; 434 struct mbuf *n; 435 int off; 436 struct sockaddr_in *udp_in; 437 { 438 struct sockaddr *append_sa; 439 struct socket *so; 440 struct mbuf *opts = 0; 441 #ifdef INET6 442 struct sockaddr_in6 udp_in6; 443 #endif 444 445 INP_LOCK_ASSERT(last); 446 447 #if defined(IPSEC) || defined(FAST_IPSEC) 448 /* check AH/ESP integrity. */ 449 if (ipsec4_in_reject(n, last)) { 450 #ifdef IPSEC 451 ipsecstat.in_polvio++; 452 #endif /*IPSEC*/ 453 m_freem(n); 454 return; 455 } 456 #endif /*IPSEC || FAST_IPSEC*/ 457 #ifdef MAC 458 if (mac_check_inpcb_deliver(last, n) != 0) { 459 m_freem(n); 460 return; 461 } 462 #endif 463 if (last->inp_flags & INP_CONTROLOPTS || 464 last->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 465 #ifdef INET6 466 if (last->inp_vflag & INP_IPV6) { 467 int savedflags; 468 469 savedflags = last->inp_flags; 470 last->inp_flags &= ~INP_UNMAPPABLEOPTS; 471 ip6_savecontrol(last, n, &opts); 472 last->inp_flags = savedflags; 473 } else 474 #endif 475 ip_savecontrol(last, &opts, ip, n); 476 } 477 #ifdef INET6 478 if (last->inp_vflag & INP_IPV6) { 479 bzero(&udp_in6, sizeof(udp_in6)); 480 udp_in6.sin6_len = sizeof(udp_in6); 481 udp_in6.sin6_family = AF_INET6; 482 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 483 append_sa = (struct sockaddr *)&udp_in6; 484 } else 485 #endif 486 append_sa = (struct sockaddr *)udp_in; 487 m_adj(n, off); 488 489 so = last->inp_socket; 490 SOCKBUF_LOCK(&so->so_rcv); 491 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 492 m_freem(n); 493 if (opts) 494 m_freem(opts); 495 udpstat.udps_fullsock++; 496 SOCKBUF_UNLOCK(&so->so_rcv); 497 } else 498 sorwakeup_locked(so); 499 } 500 501 /* 502 * Notify a udp user of an asynchronous error; 503 * just wake up so that he can collect error status. 504 */ 505 struct inpcb * 506 udp_notify(inp, errno) 507 register struct inpcb *inp; 508 int errno; 509 { 510 inp->inp_socket->so_error = errno; 511 sorwakeup(inp->inp_socket); 512 sowwakeup(inp->inp_socket); 513 return inp; 514 } 515 516 void 517 udp_ctlinput(cmd, sa, vip) 518 int cmd; 519 struct sockaddr *sa; 520 void *vip; 521 { 522 struct ip *ip = vip; 523 struct udphdr *uh; 524 struct inpcb *(*notify)(struct inpcb *, int) = udp_notify; 525 struct in_addr faddr; 526 struct inpcb *inp; 527 528 faddr = ((struct sockaddr_in *)sa)->sin_addr; 529 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 530 return; 531 532 /* 533 * Redirects don't need to be handled up here. 534 */ 535 if (PRC_IS_REDIRECT(cmd)) 536 return; 537 /* 538 * Hostdead is ugly because it goes linearly through all PCBs. 539 * XXX: We never get this from ICMP, otherwise it makes an 540 * excellent DoS attack on machines with many connections. 541 */ 542 if (cmd == PRC_HOSTDEAD) 543 ip = 0; 544 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 545 return; 546 if (ip) { 547 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 548 INP_INFO_RLOCK(&udbinfo); 549 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 550 ip->ip_src, uh->uh_sport, 0, NULL); 551 if (inp != NULL) { 552 INP_LOCK(inp); 553 if (inp->inp_socket != NULL) { 554 (*notify)(inp, inetctlerrmap[cmd]); 555 } 556 INP_UNLOCK(inp); 557 } 558 INP_INFO_RUNLOCK(&udbinfo); 559 } else 560 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); 561 } 562 563 static int 564 udp_pcblist(SYSCTL_HANDLER_ARGS) 565 { 566 int error, i, n; 567 struct inpcb *inp, **inp_list; 568 inp_gen_t gencnt; 569 struct xinpgen xig; 570 571 /* 572 * The process of preparing the TCB list is too time-consuming and 573 * resource-intensive to repeat twice on every request. 574 */ 575 if (req->oldptr == 0) { 576 n = udbinfo.ipi_count; 577 req->oldidx = 2 * (sizeof xig) 578 + (n + n/8) * sizeof(struct xinpcb); 579 return 0; 580 } 581 582 if (req->newptr != 0) 583 return EPERM; 584 585 /* 586 * OK, now we're committed to doing something. 587 */ 588 INP_INFO_RLOCK(&udbinfo); 589 gencnt = udbinfo.ipi_gencnt; 590 n = udbinfo.ipi_count; 591 INP_INFO_RUNLOCK(&udbinfo); 592 593 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 594 + n * sizeof(struct xinpcb)); 595 if (error != 0) 596 return (error); 597 598 xig.xig_len = sizeof xig; 599 xig.xig_count = n; 600 xig.xig_gen = gencnt; 601 xig.xig_sogen = so_gencnt; 602 error = SYSCTL_OUT(req, &xig, sizeof xig); 603 if (error) 604 return error; 605 606 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 607 if (inp_list == 0) 608 return ENOMEM; 609 610 INP_INFO_RLOCK(&udbinfo); 611 for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; 612 inp = LIST_NEXT(inp, inp_list)) { 613 INP_LOCK(inp); 614 if (inp->inp_gencnt <= gencnt && 615 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 616 inp_list[i++] = inp; 617 INP_UNLOCK(inp); 618 } 619 INP_INFO_RUNLOCK(&udbinfo); 620 n = i; 621 622 error = 0; 623 for (i = 0; i < n; i++) { 624 inp = inp_list[i]; 625 if (inp->inp_gencnt <= gencnt) { 626 struct xinpcb xi; 627 bzero(&xi, sizeof(xi)); 628 xi.xi_len = sizeof xi; 629 /* XXX should avoid extra copy */ 630 bcopy(inp, &xi.xi_inp, sizeof *inp); 631 if (inp->inp_socket) 632 sotoxsocket(inp->inp_socket, &xi.xi_socket); 633 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 634 error = SYSCTL_OUT(req, &xi, sizeof xi); 635 } 636 } 637 if (!error) { 638 /* 639 * Give the user an updated idea of our state. 640 * If the generation differs from what we told 641 * her before, she knows that something happened 642 * while we were processing this request, and it 643 * might be necessary to retry. 644 */ 645 INP_INFO_RLOCK(&udbinfo); 646 xig.xig_gen = udbinfo.ipi_gencnt; 647 xig.xig_sogen = so_gencnt; 648 xig.xig_count = udbinfo.ipi_count; 649 INP_INFO_RUNLOCK(&udbinfo); 650 error = SYSCTL_OUT(req, &xig, sizeof xig); 651 } 652 free(inp_list, M_TEMP); 653 return error; 654 } 655 656 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 657 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 658 659 static int 660 udp_getcred(SYSCTL_HANDLER_ARGS) 661 { 662 struct xucred xuc; 663 struct sockaddr_in addrs[2]; 664 struct inpcb *inp; 665 int error; 666 667 error = suser_cred(req->td->td_ucred, SUSER_ALLOWJAIL); 668 if (error) 669 return (error); 670 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 671 if (error) 672 return (error); 673 INP_INFO_RLOCK(&udbinfo); 674 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 675 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 676 if (inp == NULL || inp->inp_socket == NULL) { 677 error = ENOENT; 678 goto out; 679 } 680 error = cr_canseesocket(req->td->td_ucred, inp->inp_socket); 681 if (error) 682 goto out; 683 cru2x(inp->inp_socket->so_cred, &xuc); 684 out: 685 INP_INFO_RUNLOCK(&udbinfo); 686 if (error == 0) 687 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 688 return (error); 689 } 690 691 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 692 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 693 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 694 695 static int 696 udp_output(inp, m, addr, control, td) 697 register struct inpcb *inp; 698 struct mbuf *m; 699 struct sockaddr *addr; 700 struct mbuf *control; 701 struct thread *td; 702 { 703 register struct udpiphdr *ui; 704 register int len = m->m_pkthdr.len; 705 struct in_addr faddr, laddr; 706 struct cmsghdr *cm; 707 struct sockaddr_in *sin, src; 708 int error = 0; 709 int ipflags; 710 u_short fport, lport; 711 int unlock_udbinfo; 712 713 /* 714 * udp_output() may need to temporarily bind or connect the current 715 * inpcb. As such, we don't know up front what inpcb locks we will 716 * need. Do any work to decide what is needed up front before 717 * acquiring locks. 718 */ 719 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 720 if (control) 721 m_freem(control); 722 m_freem(m); 723 return EMSGSIZE; 724 } 725 726 src.sin_addr.s_addr = INADDR_ANY; 727 if (control != NULL) { 728 /* 729 * XXX: Currently, we assume all the optional information 730 * is stored in a single mbuf. 731 */ 732 if (control->m_next) { 733 m_freem(control); 734 m_freem(m); 735 return EINVAL; 736 } 737 for (; control->m_len > 0; 738 control->m_data += CMSG_ALIGN(cm->cmsg_len), 739 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 740 cm = mtod(control, struct cmsghdr *); 741 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 || 742 cm->cmsg_len > control->m_len) { 743 error = EINVAL; 744 break; 745 } 746 if (cm->cmsg_level != IPPROTO_IP) 747 continue; 748 749 switch (cm->cmsg_type) { 750 case IP_SENDSRCADDR: 751 if (cm->cmsg_len != 752 CMSG_LEN(sizeof(struct in_addr))) { 753 error = EINVAL; 754 break; 755 } 756 bzero(&src, sizeof(src)); 757 src.sin_family = AF_INET; 758 src.sin_len = sizeof(src); 759 src.sin_port = inp->inp_lport; 760 src.sin_addr = *(struct in_addr *)CMSG_DATA(cm); 761 break; 762 default: 763 error = ENOPROTOOPT; 764 break; 765 } 766 if (error) 767 break; 768 } 769 m_freem(control); 770 } 771 if (error) { 772 m_freem(m); 773 return error; 774 } 775 776 if (src.sin_addr.s_addr != INADDR_ANY || 777 addr != NULL) { 778 INP_INFO_WLOCK(&udbinfo); 779 unlock_udbinfo = 1; 780 } else 781 unlock_udbinfo = 0; 782 INP_LOCK(inp); 783 784 #ifdef MAC 785 mac_create_mbuf_from_inpcb(inp, m); 786 #endif 787 788 laddr = inp->inp_laddr; 789 lport = inp->inp_lport; 790 if (src.sin_addr.s_addr != INADDR_ANY) { 791 if (lport == 0) { 792 error = EINVAL; 793 goto release; 794 } 795 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 796 &laddr.s_addr, &lport, td->td_ucred); 797 if (error) 798 goto release; 799 } 800 801 if (addr) { 802 sin = (struct sockaddr_in *)addr; 803 if (jailed(td->td_ucred)) 804 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 805 if (inp->inp_faddr.s_addr != INADDR_ANY) { 806 error = EISCONN; 807 goto release; 808 } 809 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport, 810 &faddr.s_addr, &fport, NULL, td->td_ucred); 811 if (error) 812 goto release; 813 814 /* Commit the local port if newly assigned. */ 815 if (inp->inp_laddr.s_addr == INADDR_ANY && 816 inp->inp_lport == 0) { 817 /* 818 * Remember addr if jailed, to prevent rebinding. 819 */ 820 if (jailed(td->td_ucred)) 821 inp->inp_laddr = laddr; 822 inp->inp_lport = lport; 823 if (in_pcbinshash(inp) != 0) { 824 inp->inp_lport = 0; 825 error = EAGAIN; 826 goto release; 827 } 828 inp->inp_flags |= INP_ANONPORT; 829 } 830 } else { 831 faddr = inp->inp_faddr; 832 fport = inp->inp_fport; 833 if (faddr.s_addr == INADDR_ANY) { 834 error = ENOTCONN; 835 goto release; 836 } 837 } 838 839 /* 840 * Calculate data length and get a mbuf for UDP, IP, and possible 841 * link-layer headers. Immediate slide the data pointer back forward 842 * since we won't use that space at this layer. 843 */ 844 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 845 if (m == NULL) { 846 error = ENOBUFS; 847 goto release; 848 } 849 m->m_data += max_linkhdr; 850 m->m_len -= max_linkhdr; 851 m->m_pkthdr.len -= max_linkhdr; 852 853 /* 854 * Fill in mbuf with extended UDP header 855 * and addresses and length put into network format. 856 */ 857 ui = mtod(m, struct udpiphdr *); 858 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 859 ui->ui_pr = IPPROTO_UDP; 860 ui->ui_src = laddr; 861 ui->ui_dst = faddr; 862 ui->ui_sport = lport; 863 ui->ui_dport = fport; 864 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 865 866 /* 867 * Set the Don't Fragment bit in the IP header. 868 */ 869 if (inp->inp_flags & INP_DONTFRAG) { 870 struct ip *ip; 871 ip = (struct ip *)&ui->ui_i; 872 ip->ip_off |= IP_DF; 873 } 874 875 ipflags = 0; 876 if (inp->inp_socket->so_options & SO_DONTROUTE) 877 ipflags |= IP_ROUTETOIF; 878 if (inp->inp_socket->so_options & SO_BROADCAST) 879 ipflags |= IP_ALLOWBROADCAST; 880 if (inp->inp_vflag & INP_ONESBCAST) 881 ipflags |= IP_SENDONES; 882 883 /* 884 * Set up checksum and output datagram. 885 */ 886 if (udpcksum) { 887 if (inp->inp_vflag & INP_ONESBCAST) 888 faddr.s_addr = INADDR_BROADCAST; 889 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 890 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 891 m->m_pkthdr.csum_flags = CSUM_UDP; 892 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 893 } else { 894 ui->ui_sum = 0; 895 } 896 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 897 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 898 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 899 udpstat.udps_opackets++; 900 901 if (unlock_udbinfo) 902 INP_INFO_WUNLOCK(&udbinfo); 903 error = ip_output(m, inp->inp_options, NULL, ipflags, 904 inp->inp_moptions, inp); 905 INP_UNLOCK(inp); 906 return (error); 907 908 release: 909 INP_UNLOCK(inp); 910 if (unlock_udbinfo) 911 INP_INFO_WUNLOCK(&udbinfo); 912 m_freem(m); 913 return (error); 914 } 915 916 u_long udp_sendspace = 9216; /* really max datagram size */ 917 /* 40 1K datagrams */ 918 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 919 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 920 921 u_long udp_recvspace = 40 * (1024 + 922 #ifdef INET6 923 sizeof(struct sockaddr_in6) 924 #else 925 sizeof(struct sockaddr_in) 926 #endif 927 ); 928 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 929 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 930 931 static int 932 udp_abort(struct socket *so) 933 { 934 struct inpcb *inp; 935 936 INP_INFO_WLOCK(&udbinfo); 937 inp = sotoinpcb(so); 938 if (inp == 0) { 939 INP_INFO_WUNLOCK(&udbinfo); 940 return EINVAL; /* ??? possible? panic instead? */ 941 } 942 INP_LOCK(inp); 943 soisdisconnected(so); 944 in_pcbdetach(inp); 945 INP_INFO_WUNLOCK(&udbinfo); 946 return 0; 947 } 948 949 static int 950 udp_attach(struct socket *so, int proto, struct thread *td) 951 { 952 struct inpcb *inp; 953 int error; 954 955 INP_INFO_WLOCK(&udbinfo); 956 inp = sotoinpcb(so); 957 if (inp != 0) { 958 INP_INFO_WUNLOCK(&udbinfo); 959 return EINVAL; 960 } 961 error = soreserve(so, udp_sendspace, udp_recvspace); 962 if (error) { 963 INP_INFO_WUNLOCK(&udbinfo); 964 return error; 965 } 966 error = in_pcballoc(so, &udbinfo, "udpinp"); 967 if (error) { 968 INP_INFO_WUNLOCK(&udbinfo); 969 return error; 970 } 971 972 inp = (struct inpcb *)so->so_pcb; 973 INP_LOCK(inp); 974 INP_INFO_WUNLOCK(&udbinfo); 975 inp->inp_vflag |= INP_IPV4; 976 inp->inp_ip_ttl = ip_defttl; 977 INP_UNLOCK(inp); 978 return 0; 979 } 980 981 static int 982 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 983 { 984 struct inpcb *inp; 985 int error; 986 987 INP_INFO_WLOCK(&udbinfo); 988 inp = sotoinpcb(so); 989 if (inp == 0) { 990 INP_INFO_WUNLOCK(&udbinfo); 991 return EINVAL; 992 } 993 INP_LOCK(inp); 994 error = in_pcbbind(inp, nam, td->td_ucred); 995 INP_UNLOCK(inp); 996 INP_INFO_WUNLOCK(&udbinfo); 997 return error; 998 } 999 1000 static int 1001 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1002 { 1003 struct inpcb *inp; 1004 int error; 1005 struct sockaddr_in *sin; 1006 1007 INP_INFO_WLOCK(&udbinfo); 1008 inp = sotoinpcb(so); 1009 if (inp == 0) { 1010 INP_INFO_WUNLOCK(&udbinfo); 1011 return EINVAL; 1012 } 1013 INP_LOCK(inp); 1014 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1015 INP_UNLOCK(inp); 1016 INP_INFO_WUNLOCK(&udbinfo); 1017 return EISCONN; 1018 } 1019 sin = (struct sockaddr_in *)nam; 1020 if (jailed(td->td_ucred)) 1021 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 1022 error = in_pcbconnect(inp, nam, td->td_ucred); 1023 if (error == 0) 1024 soisconnected(so); 1025 INP_UNLOCK(inp); 1026 INP_INFO_WUNLOCK(&udbinfo); 1027 return error; 1028 } 1029 1030 static int 1031 udp_detach(struct socket *so) 1032 { 1033 struct inpcb *inp; 1034 1035 INP_INFO_WLOCK(&udbinfo); 1036 inp = sotoinpcb(so); 1037 if (inp == 0) { 1038 INP_INFO_WUNLOCK(&udbinfo); 1039 return EINVAL; 1040 } 1041 INP_LOCK(inp); 1042 in_pcbdetach(inp); 1043 INP_INFO_WUNLOCK(&udbinfo); 1044 return 0; 1045 } 1046 1047 static int 1048 udp_disconnect(struct socket *so) 1049 { 1050 struct inpcb *inp; 1051 1052 INP_INFO_WLOCK(&udbinfo); 1053 inp = sotoinpcb(so); 1054 if (inp == 0) { 1055 INP_INFO_WUNLOCK(&udbinfo); 1056 return EINVAL; 1057 } 1058 INP_LOCK(inp); 1059 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1060 INP_INFO_WUNLOCK(&udbinfo); 1061 INP_UNLOCK(inp); 1062 return ENOTCONN; 1063 } 1064 1065 in_pcbdisconnect(inp); 1066 inp->inp_laddr.s_addr = INADDR_ANY; 1067 INP_UNLOCK(inp); 1068 INP_INFO_WUNLOCK(&udbinfo); 1069 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1070 return 0; 1071 } 1072 1073 static int 1074 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1075 struct mbuf *control, struct thread *td) 1076 { 1077 struct inpcb *inp; 1078 1079 inp = sotoinpcb(so); 1080 return udp_output(inp, m, addr, control, td); 1081 } 1082 1083 int 1084 udp_shutdown(struct socket *so) 1085 { 1086 struct inpcb *inp; 1087 1088 INP_INFO_RLOCK(&udbinfo); 1089 inp = sotoinpcb(so); 1090 if (inp == 0) { 1091 INP_INFO_RUNLOCK(&udbinfo); 1092 return EINVAL; 1093 } 1094 INP_LOCK(inp); 1095 INP_INFO_RUNLOCK(&udbinfo); 1096 socantsendmore(so); 1097 INP_UNLOCK(inp); 1098 return 0; 1099 } 1100 1101 /* 1102 * This is the wrapper function for in_setsockaddr. We just pass down 1103 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 1104 * here because in_setsockaddr will call malloc and might block. 1105 */ 1106 static int 1107 udp_sockaddr(struct socket *so, struct sockaddr **nam) 1108 { 1109 return (in_setsockaddr(so, nam, &udbinfo)); 1110 } 1111 1112 /* 1113 * This is the wrapper function for in_setpeeraddr. We just pass down 1114 * the pcbinfo for in_setpeeraddr to lock. 1115 */ 1116 static int 1117 udp_peeraddr(struct socket *so, struct sockaddr **nam) 1118 { 1119 return (in_setpeeraddr(so, nam, &udbinfo)); 1120 } 1121 1122 struct pr_usrreqs udp_usrreqs = { 1123 .pru_abort = udp_abort, 1124 .pru_attach = udp_attach, 1125 .pru_bind = udp_bind, 1126 .pru_connect = udp_connect, 1127 .pru_control = in_control, 1128 .pru_detach = udp_detach, 1129 .pru_disconnect = udp_disconnect, 1130 .pru_peeraddr = udp_peeraddr, 1131 .pru_send = udp_send, 1132 .pru_shutdown = udp_shutdown, 1133 .pru_sockaddr = udp_sockaddr, 1134 .pru_sosetlabel = in_pcbsosetlabel 1135 };
Cache object: 6e75679e3fccd9d2eb98bc7014137e6c
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]