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. 4 * Copyright (c) 2008 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_ipfw.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 #include "opt_mac.h" 41 42 #include <sys/param.h> 43 #include <sys/domain.h> 44 #include <sys/eventhandler.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/protosw.h> 53 #include <sys/signalvar.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/sx.h> 57 #include <sys/sysctl.h> 58 #include <sys/syslog.h> 59 #include <sys/systm.h> 60 61 #include <vm/uma.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_pcb.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/in_var.h> 70 #include <netinet/ip.h> 71 #ifdef INET6 72 #include <netinet/ip6.h> 73 #endif 74 #include <netinet/ip_icmp.h> 75 #include <netinet/icmp_var.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_options.h> 78 #ifdef INET6 79 #include <netinet6/ip6_var.h> 80 #endif 81 #include <netinet/udp.h> 82 #include <netinet/udp_var.h> 83 #ifdef INET6 84 #include <netinet6/udp6_var.h> 85 #endif 86 87 #ifdef IPSEC 88 #include <netipsec/ipsec.h> 89 #endif 90 91 #include <machine/in_cksum.h> 92 93 #include <security/mac/mac_framework.h> 94 95 /* 96 * UDP protocol implementation. 97 * Per RFC 768, August, 1980. 98 */ 99 100 /* 101 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums 102 * removes the only data integrity mechanism for packets and malformed 103 * packets that would otherwise be discarded due to bad checksums, and may 104 * cause problems (especially for NFS data blocks). 105 */ 106 static int udp_cksum = 1; 107 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum, 108 0, ""); 109 110 int udp_log_in_vain = 0; 111 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 112 &udp_log_in_vain, 0, "Log all incoming UDP packets"); 113 114 int udp_blackhole = 0; 115 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, &udp_blackhole, 0, 116 "Do not send port unreachables for refused connects"); 117 118 u_long udp_sendspace = 9216; /* really max datagram size */ 119 /* 40 1K datagrams */ 120 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 121 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 122 123 u_long udp_recvspace = 40 * (1024 + 124 #ifdef INET6 125 sizeof(struct sockaddr_in6) 126 #else 127 sizeof(struct sockaddr_in) 128 #endif 129 ); 130 131 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 132 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 133 134 static int udp_soreceive_dgram; 135 SYSCTL_INT(_net_inet_udp, OID_AUTO, soreceive_dgram_enabled, 136 CTLFLAG_RD | CTLFLAG_TUN, &udp_soreceive_dgram, 0, 137 "Use experimental optimized datagram receive"); 138 139 struct inpcbhead udb; /* from udp_var.h */ 140 struct inpcbinfo udbinfo; 141 142 #ifndef UDBHASHSIZE 143 #define UDBHASHSIZE 128 144 #endif 145 146 struct udpstat udpstat; /* from udp_var.h */ 147 SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, &udpstat, 148 udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 149 150 static void udp_detach(struct socket *so); 151 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 152 struct mbuf *, struct thread *); 153 154 static void 155 udp_zone_change(void *tag) 156 { 157 158 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 159 } 160 161 static int 162 udp_inpcb_init(void *mem, int size, int flags) 163 { 164 struct inpcb *inp; 165 166 inp = mem; 167 INP_LOCK_INIT(inp, "inp", "udpinp"); 168 return (0); 169 } 170 171 void 172 udp_init(void) 173 { 174 175 INP_INFO_LOCK_INIT(&udbinfo, "udp"); 176 LIST_INIT(&udb); 177 udbinfo.ipi_listhead = &udb; 178 udbinfo.ipi_hashbase = hashinit(UDBHASHSIZE, M_PCB, 179 &udbinfo.ipi_hashmask); 180 udbinfo.ipi_porthashbase = hashinit(UDBHASHSIZE, M_PCB, 181 &udbinfo.ipi_porthashmask); 182 udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 183 NULL, udp_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 184 uma_zone_set_max(udbinfo.ipi_zone, maxsockets); 185 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 186 EVENTHANDLER_PRI_ANY); 187 TUNABLE_INT_FETCH("net.inet.udp.soreceive_dgram_enabled", 188 &udp_soreceive_dgram); 189 if (udp_soreceive_dgram) { 190 udp_usrreqs.pru_soreceive = soreceive_dgram; 191 #ifdef INET6 192 udp6_usrreqs.pru_soreceive = soreceive_dgram; 193 #endif 194 } 195 } 196 197 /* 198 * Subroutine of udp_input(), which appends the provided mbuf chain to the 199 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 200 * contains the source address. If the socket ends up being an IPv6 socket, 201 * udp_append() will convert to a sockaddr_in6 before passing the address 202 * into the socket code. 203 */ 204 static void 205 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off, 206 struct sockaddr_in *udp_in) 207 { 208 struct sockaddr *append_sa; 209 struct socket *so; 210 struct mbuf *opts = 0; 211 #ifdef INET6 212 struct sockaddr_in6 udp_in6; 213 #endif 214 215 INP_RLOCK_ASSERT(inp); 216 217 #ifdef IPSEC 218 /* Check AH/ESP integrity. */ 219 if (ipsec4_in_reject(n, inp)) { 220 m_freem(n); 221 ipsec4stat.in_polvio++; 222 return; 223 } 224 #endif /* IPSEC */ 225 #ifdef MAC 226 if (mac_check_inpcb_deliver(inp, n) != 0) { 227 m_freem(n); 228 return; 229 } 230 #endif 231 if (inp->inp_flags & INP_CONTROLOPTS || 232 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 233 #ifdef INET6 234 if (inp->inp_vflag & INP_IPV6) 235 (void)ip6_savecontrol_v4(inp, n, &opts, NULL); 236 else 237 #endif 238 ip_savecontrol(inp, &opts, ip, n); 239 } 240 #ifdef INET6 241 if (inp->inp_vflag & INP_IPV6) { 242 bzero(&udp_in6, sizeof(udp_in6)); 243 udp_in6.sin6_len = sizeof(udp_in6); 244 udp_in6.sin6_family = AF_INET6; 245 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 246 append_sa = (struct sockaddr *)&udp_in6; 247 } else 248 #endif 249 append_sa = (struct sockaddr *)udp_in; 250 m_adj(n, off); 251 252 so = inp->inp_socket; 253 SOCKBUF_LOCK(&so->so_rcv); 254 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 255 SOCKBUF_UNLOCK(&so->so_rcv); 256 m_freem(n); 257 if (opts) 258 m_freem(opts); 259 udpstat.udps_fullsock++; 260 } else 261 sorwakeup_locked(so); 262 } 263 264 void 265 udp_input(struct mbuf *m, int off) 266 { 267 int iphlen = off; 268 struct ip *ip; 269 struct udphdr *uh; 270 struct ifnet *ifp; 271 struct inpcb *inp; 272 int len; 273 struct ip save_ip; 274 struct sockaddr_in udp_in; 275 #ifdef IPFIREWALL_FORWARD 276 struct m_tag *fwd_tag; 277 #endif 278 279 ifp = m->m_pkthdr.rcvif; 280 udpstat.udps_ipackets++; 281 282 /* 283 * Strip IP options, if any; should skip this, make available to 284 * user, and use on returned packets, but we don't yet have a way to 285 * check the checksum with options still present. 286 */ 287 if (iphlen > sizeof (struct ip)) { 288 ip_stripoptions(m, (struct mbuf *)0); 289 iphlen = sizeof(struct ip); 290 } 291 292 /* 293 * Get IP and UDP header together in first mbuf. 294 */ 295 ip = mtod(m, struct ip *); 296 if (m->m_len < iphlen + sizeof(struct udphdr)) { 297 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 298 udpstat.udps_hdrops++; 299 return; 300 } 301 ip = mtod(m, struct ip *); 302 } 303 uh = (struct udphdr *)((caddr_t)ip + iphlen); 304 305 /* 306 * Destination port of 0 is illegal, based on RFC768. 307 */ 308 if (uh->uh_dport == 0) 309 goto badunlocked; 310 311 /* 312 * Construct sockaddr format source address. Stuff source address 313 * and datagram in user buffer. 314 */ 315 bzero(&udp_in, sizeof(udp_in)); 316 udp_in.sin_len = sizeof(udp_in); 317 udp_in.sin_family = AF_INET; 318 udp_in.sin_port = uh->uh_sport; 319 udp_in.sin_addr = ip->ip_src; 320 321 /* 322 * Make mbuf data length reflect UDP length. If not enough data to 323 * reflect UDP length, drop. 324 */ 325 len = ntohs((u_short)uh->uh_ulen); 326 if (ip->ip_len != len) { 327 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 328 udpstat.udps_badlen++; 329 goto badunlocked; 330 } 331 m_adj(m, len - ip->ip_len); 332 /* ip->ip_len = len; */ 333 } 334 335 /* 336 * Save a copy of the IP header in case we want restore it for 337 * sending an ICMP error message in response. 338 */ 339 if (!udp_blackhole) 340 save_ip = *ip; 341 else 342 memset(&save_ip, 0, sizeof(save_ip)); 343 344 /* 345 * Checksum extended UDP header and data. 346 */ 347 if (uh->uh_sum) { 348 u_short uh_sum; 349 350 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 351 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 352 uh_sum = m->m_pkthdr.csum_data; 353 else 354 uh_sum = in_pseudo(ip->ip_src.s_addr, 355 ip->ip_dst.s_addr, htonl((u_short)len + 356 m->m_pkthdr.csum_data + IPPROTO_UDP)); 357 uh_sum ^= 0xffff; 358 } else { 359 char b[9]; 360 361 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 362 bzero(((struct ipovly *)ip)->ih_x1, 9); 363 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 364 uh_sum = in_cksum(m, len + sizeof (struct ip)); 365 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 366 } 367 if (uh_sum) { 368 udpstat.udps_badsum++; 369 m_freem(m); 370 return; 371 } 372 } else 373 udpstat.udps_nosum++; 374 375 #ifdef IPFIREWALL_FORWARD 376 /* 377 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 378 */ 379 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 380 if (fwd_tag != NULL) { 381 struct sockaddr_in *next_hop; 382 383 /* 384 * Do the hack. 385 */ 386 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 387 ip->ip_dst = next_hop->sin_addr; 388 uh->uh_dport = ntohs(next_hop->sin_port); 389 390 /* 391 * Remove the tag from the packet. We don't need it anymore. 392 */ 393 m_tag_delete(m, fwd_tag); 394 } 395 #endif 396 397 INP_INFO_RLOCK(&udbinfo); 398 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 399 in_broadcast(ip->ip_dst, ifp)) { 400 struct inpcb *last; 401 struct ip_moptions *imo; 402 403 last = NULL; 404 LIST_FOREACH(inp, &udb, inp_list) { 405 if (inp->inp_lport != uh->uh_dport) 406 continue; 407 #ifdef INET6 408 if ((inp->inp_vflag & INP_IPV4) == 0) 409 continue; 410 #endif 411 if (inp->inp_laddr.s_addr != INADDR_ANY && 412 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 413 continue; 414 if (inp->inp_faddr.s_addr != INADDR_ANY && 415 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 416 continue; 417 /* 418 * XXX: Do not check source port of incoming datagram 419 * unless inp_connect() has been called to bind the 420 * fport part of the 4-tuple; the source could be 421 * trying to talk to us with an ephemeral port. 422 */ 423 if (inp->inp_fport != 0 && 424 inp->inp_fport != uh->uh_sport) 425 continue; 426 427 INP_RLOCK(inp); 428 429 /* 430 * Handle socket delivery policy for any-source 431 * and source-specific multicast. [RFC3678] 432 */ 433 imo = inp->inp_moptions; 434 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 435 imo != NULL) { 436 struct sockaddr_in sin; 437 struct in_msource *ims; 438 int blocked, mode; 439 size_t idx; 440 441 bzero(&sin, sizeof(struct sockaddr_in)); 442 sin.sin_len = sizeof(struct sockaddr_in); 443 sin.sin_family = AF_INET; 444 sin.sin_addr = ip->ip_dst; 445 446 blocked = 0; 447 idx = imo_match_group(imo, ifp, 448 (struct sockaddr *)&sin); 449 if (idx == -1) { 450 /* 451 * No group membership for this socket. 452 * Do not bump udps_noportbcast, as 453 * this will happen further down. 454 */ 455 blocked++; 456 } else { 457 /* 458 * Check for a multicast source filter 459 * entry on this socket for this group. 460 * MCAST_EXCLUDE is the default 461 * behaviour. It means default accept; 462 * entries, if present, denote sources 463 * to be excluded from delivery. 464 */ 465 ims = imo_match_source(imo, idx, 466 (struct sockaddr *)&udp_in); 467 mode = imo->imo_mfilters[idx].imf_fmode; 468 if ((ims != NULL && 469 mode == MCAST_EXCLUDE) || 470 (ims == NULL && 471 mode == MCAST_INCLUDE)) { 472 #ifdef DIAGNOSTIC 473 if (bootverbose) { 474 printf("%s: blocked by" 475 " source filter\n", 476 __func__); 477 } 478 #endif 479 udpstat.udps_filtermcast++; 480 blocked++; 481 } 482 } 483 if (blocked != 0) { 484 INP_RUNLOCK(inp); 485 continue; 486 } 487 } 488 if (last != NULL) { 489 struct mbuf *n; 490 491 n = m_copy(m, 0, M_COPYALL); 492 if (n != NULL) 493 udp_append(last, ip, n, iphlen + 494 sizeof(struct udphdr), &udp_in); 495 INP_RUNLOCK(last); 496 } 497 last = inp; 498 /* 499 * Don't look for additional matches if this one does 500 * not have either the SO_REUSEPORT or SO_REUSEADDR 501 * socket options set. This heuristic avoids 502 * searching through all pcbs in the common case of a 503 * non-shared port. It assumes that an application 504 * will never clear these options after setting them. 505 */ 506 if ((last->inp_socket->so_options & 507 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 508 break; 509 } 510 511 if (last == NULL) { 512 /* 513 * No matching pcb found; discard datagram. (No need 514 * to send an ICMP Port Unreachable for a broadcast 515 * or multicast datgram.) 516 */ 517 udpstat.udps_noportbcast++; 518 goto badheadlocked; 519 } 520 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 521 &udp_in); 522 INP_RUNLOCK(last); 523 INP_INFO_RUNLOCK(&udbinfo); 524 return; 525 } 526 527 /* 528 * Locate pcb for datagram. 529 */ 530 inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, 531 ip->ip_dst, uh->uh_dport, 1, ifp); 532 if (inp == NULL) { 533 if (udp_log_in_vain) { 534 char buf[4*sizeof "123"]; 535 536 strcpy(buf, inet_ntoa(ip->ip_dst)); 537 log(LOG_INFO, 538 "Connection attempt to UDP %s:%d from %s:%d\n", 539 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 540 ntohs(uh->uh_sport)); 541 } 542 udpstat.udps_noport++; 543 if (m->m_flags & (M_BCAST | M_MCAST)) { 544 udpstat.udps_noportbcast++; 545 goto badheadlocked; 546 } 547 if (udp_blackhole) 548 goto badheadlocked; 549 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 550 goto badheadlocked; 551 *ip = save_ip; 552 ip->ip_len += iphlen; 553 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 554 INP_INFO_RUNLOCK(&udbinfo); 555 return; 556 } 557 558 /* 559 * Check the minimum TTL for socket. 560 */ 561 INP_RLOCK(inp); 562 INP_INFO_RUNLOCK(&udbinfo); 563 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 564 INP_RUNLOCK(inp); 565 goto badunlocked; 566 } 567 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 568 INP_RUNLOCK(inp); 569 return; 570 571 badheadlocked: 572 if (inp) 573 INP_RUNLOCK(inp); 574 INP_INFO_RUNLOCK(&udbinfo); 575 badunlocked: 576 m_freem(m); 577 } 578 579 /* 580 * Notify a udp user of an asynchronous error; just wake up so that they can 581 * collect error status. 582 */ 583 struct inpcb * 584 udp_notify(struct inpcb *inp, int errno) 585 { 586 587 /* 588 * While udp_ctlinput() always calls udp_notify() with a read lock 589 * when invoking it directly, in_pcbnotifyall() currently uses write 590 * locks due to sharing code with TCP. For now, accept either a read 591 * or a write lock, but a read lock is sufficient. 592 */ 593 INP_LOCK_ASSERT(inp); 594 595 inp->inp_socket->so_error = errno; 596 sorwakeup(inp->inp_socket); 597 sowwakeup(inp->inp_socket); 598 return (inp); 599 } 600 601 void 602 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 603 { 604 struct ip *ip = vip; 605 struct udphdr *uh; 606 struct in_addr faddr; 607 struct inpcb *inp; 608 609 faddr = ((struct sockaddr_in *)sa)->sin_addr; 610 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 611 return; 612 613 /* 614 * Redirects don't need to be handled up here. 615 */ 616 if (PRC_IS_REDIRECT(cmd)) 617 return; 618 619 /* 620 * Hostdead is ugly because it goes linearly through all PCBs. 621 * 622 * XXX: We never get this from ICMP, otherwise it makes an excellent 623 * DoS attack on machines with many connections. 624 */ 625 if (cmd == PRC_HOSTDEAD) 626 ip = NULL; 627 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 628 return; 629 if (ip != NULL) { 630 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 631 INP_INFO_RLOCK(&udbinfo); 632 inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, 633 ip->ip_src, uh->uh_sport, 0, NULL); 634 if (inp != NULL) { 635 INP_RLOCK(inp); 636 if (inp->inp_socket != NULL) { 637 udp_notify(inp, inetctlerrmap[cmd]); 638 } 639 INP_RUNLOCK(inp); 640 } 641 INP_INFO_RUNLOCK(&udbinfo); 642 } else 643 in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], 644 udp_notify); 645 } 646 647 static int 648 udp_pcblist(SYSCTL_HANDLER_ARGS) 649 { 650 int error, i, n; 651 struct inpcb *inp, **inp_list; 652 inp_gen_t gencnt; 653 struct xinpgen xig; 654 655 /* 656 * The process of preparing the PCB list is too time-consuming and 657 * resource-intensive to repeat twice on every request. 658 */ 659 if (req->oldptr == 0) { 660 n = udbinfo.ipi_count; 661 req->oldidx = 2 * (sizeof xig) 662 + (n + n/8) * sizeof(struct xinpcb); 663 return (0); 664 } 665 666 if (req->newptr != 0) 667 return (EPERM); 668 669 /* 670 * OK, now we're committed to doing something. 671 */ 672 INP_INFO_RLOCK(&udbinfo); 673 gencnt = udbinfo.ipi_gencnt; 674 n = udbinfo.ipi_count; 675 INP_INFO_RUNLOCK(&udbinfo); 676 677 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 678 + n * sizeof(struct xinpcb)); 679 if (error != 0) 680 return (error); 681 682 xig.xig_len = sizeof xig; 683 xig.xig_count = n; 684 xig.xig_gen = gencnt; 685 xig.xig_sogen = so_gencnt; 686 error = SYSCTL_OUT(req, &xig, sizeof xig); 687 if (error) 688 return (error); 689 690 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 691 if (inp_list == 0) 692 return (ENOMEM); 693 694 INP_INFO_RLOCK(&udbinfo); 695 for (inp = LIST_FIRST(udbinfo.ipi_listhead), i = 0; inp && i < n; 696 inp = LIST_NEXT(inp, inp_list)) { 697 INP_RLOCK(inp); 698 if (inp->inp_gencnt <= gencnt && 699 cr_canseeinpcb(req->td->td_ucred, inp) == 0) 700 inp_list[i++] = inp; 701 INP_RUNLOCK(inp); 702 } 703 INP_INFO_RUNLOCK(&udbinfo); 704 n = i; 705 706 error = 0; 707 for (i = 0; i < n; i++) { 708 inp = inp_list[i]; 709 INP_RLOCK(inp); 710 if (inp->inp_gencnt <= gencnt) { 711 struct xinpcb xi; 712 bzero(&xi, sizeof(xi)); 713 xi.xi_len = sizeof xi; 714 /* XXX should avoid extra copy */ 715 bcopy(inp, &xi.xi_inp, sizeof *inp); 716 if (inp->inp_socket) 717 sotoxsocket(inp->inp_socket, &xi.xi_socket); 718 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 719 INP_RUNLOCK(inp); 720 error = SYSCTL_OUT(req, &xi, sizeof xi); 721 } else 722 INP_RUNLOCK(inp); 723 } 724 if (!error) { 725 /* 726 * Give the user an updated idea of our state. If the 727 * generation differs from what we told her before, she knows 728 * that something happened while we were processing this 729 * request, and it might be necessary to retry. 730 */ 731 INP_INFO_RLOCK(&udbinfo); 732 xig.xig_gen = udbinfo.ipi_gencnt; 733 xig.xig_sogen = so_gencnt; 734 xig.xig_count = udbinfo.ipi_count; 735 INP_INFO_RUNLOCK(&udbinfo); 736 error = SYSCTL_OUT(req, &xig, sizeof xig); 737 } 738 free(inp_list, M_TEMP); 739 return (error); 740 } 741 742 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 743 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 744 745 static int 746 udp_getcred(SYSCTL_HANDLER_ARGS) 747 { 748 struct xucred xuc; 749 struct sockaddr_in addrs[2]; 750 struct inpcb *inp; 751 int error; 752 753 error = priv_check(req->td, PRIV_NETINET_GETCRED); 754 if (error) 755 return (error); 756 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 757 if (error) 758 return (error); 759 INP_INFO_RLOCK(&udbinfo); 760 inp = in_pcblookup_hash(&udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 761 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 762 if (inp != NULL) { 763 INP_RLOCK(inp); 764 INP_INFO_RUNLOCK(&udbinfo); 765 if (inp->inp_socket == NULL) 766 error = ENOENT; 767 if (error == 0) 768 error = cr_canseeinpcb(req->td->td_ucred, inp); 769 if (error == 0) 770 cru2x(inp->inp_cred, &xuc); 771 INP_RUNLOCK(inp); 772 } else { 773 INP_INFO_RUNLOCK(&udbinfo); 774 error = ENOENT; 775 } 776 if (error == 0) 777 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 778 return (error); 779 } 780 781 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 782 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 783 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 784 785 static int 786 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 787 struct mbuf *control, struct thread *td) 788 { 789 struct udpiphdr *ui; 790 int len = m->m_pkthdr.len; 791 struct in_addr faddr, laddr; 792 struct cmsghdr *cm; 793 struct sockaddr_in *sin, src; 794 int error = 0; 795 int ipflags; 796 u_short fport, lport; 797 int unlock_udbinfo; 798 799 /* 800 * udp_output() may need to temporarily bind or connect the current 801 * inpcb. As such, we don't know up front whether we will need the 802 * pcbinfo lock or not. Do any work to decide what is needed up 803 * front before acquiring any locks. 804 */ 805 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 806 if (control) 807 m_freem(control); 808 m_freem(m); 809 return (EMSGSIZE); 810 } 811 812 src.sin_family = 0; 813 if (control != NULL) { 814 /* 815 * XXX: Currently, we assume all the optional information is 816 * stored in a single mbuf. 817 */ 818 if (control->m_next) { 819 m_freem(control); 820 m_freem(m); 821 return (EINVAL); 822 } 823 for (; control->m_len > 0; 824 control->m_data += CMSG_ALIGN(cm->cmsg_len), 825 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 826 cm = mtod(control, struct cmsghdr *); 827 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 828 || cm->cmsg_len > control->m_len) { 829 error = EINVAL; 830 break; 831 } 832 if (cm->cmsg_level != IPPROTO_IP) 833 continue; 834 835 switch (cm->cmsg_type) { 836 case IP_SENDSRCADDR: 837 if (cm->cmsg_len != 838 CMSG_LEN(sizeof(struct in_addr))) { 839 error = EINVAL; 840 break; 841 } 842 bzero(&src, sizeof(src)); 843 src.sin_family = AF_INET; 844 src.sin_len = sizeof(src); 845 src.sin_port = inp->inp_lport; 846 src.sin_addr = 847 *(struct in_addr *)CMSG_DATA(cm); 848 break; 849 850 default: 851 error = ENOPROTOOPT; 852 break; 853 } 854 if (error) 855 break; 856 } 857 m_freem(control); 858 } 859 if (error) { 860 m_freem(m); 861 return (error); 862 } 863 864 /* 865 * Depending on whether or not the application has bound or connected 866 * the socket, we may have to do varying levels of work. The optimal 867 * case is for a connected UDP socket, as a global lock isn't 868 * required at all. 869 * 870 * In order to decide which we need, we require stability of the 871 * inpcb binding, which we ensure by acquiring a read lock on the 872 * inpcb. This doesn't strictly follow the lock order, so we play 873 * the trylock and retry game; note that we may end up with more 874 * conservative locks than required the second time around, so later 875 * assertions have to accept that. Further analysis of the number of 876 * misses under contention is required. 877 */ 878 sin = (struct sockaddr_in *)addr; 879 INP_RLOCK(inp); 880 if (sin != NULL && 881 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 882 INP_RUNLOCK(inp); 883 INP_INFO_WLOCK(&udbinfo); 884 INP_WLOCK(inp); 885 unlock_udbinfo = 2; 886 } else if ((sin != NULL && ( 887 (sin->sin_addr.s_addr == INADDR_ANY) || 888 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 889 (inp->inp_laddr.s_addr == INADDR_ANY) || 890 (inp->inp_lport == 0))) || 891 (src.sin_family == AF_INET)) { 892 if (!INP_INFO_TRY_RLOCK(&udbinfo)) { 893 INP_RUNLOCK(inp); 894 INP_INFO_RLOCK(&udbinfo); 895 INP_RLOCK(inp); 896 } 897 unlock_udbinfo = 1; 898 } else 899 unlock_udbinfo = 0; 900 901 /* 902 * If the IP_SENDSRCADDR control message was specified, override the 903 * source address for this datagram. Its use is invalidated if the 904 * address thus specified is incomplete or clobbers other inpcbs. 905 */ 906 laddr = inp->inp_laddr; 907 lport = inp->inp_lport; 908 if (src.sin_family == AF_INET) { 909 INP_INFO_LOCK_ASSERT(&udbinfo); 910 if ((lport == 0) || 911 (laddr.s_addr == INADDR_ANY && 912 src.sin_addr.s_addr == INADDR_ANY)) { 913 error = EINVAL; 914 goto release; 915 } 916 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 917 &laddr.s_addr, &lport, td->td_ucred); 918 if (error) 919 goto release; 920 } 921 922 /* 923 * If a UDP socket has been connected, then a local address/port will 924 * have been selected and bound. 925 * 926 * If a UDP socket has not been connected to, then an explicit 927 * destination address must be used, in which case a local 928 * address/port may not have been selected and bound. 929 */ 930 if (sin != NULL) { 931 INP_LOCK_ASSERT(inp); 932 if (inp->inp_faddr.s_addr != INADDR_ANY) { 933 error = EISCONN; 934 goto release; 935 } 936 937 /* 938 * Jail may rewrite the destination address, so let it do 939 * that before we use it. 940 */ 941 if (jailed(td->td_ucred)) 942 prison_remote_ip(td->td_ucred, 0, 943 &sin->sin_addr.s_addr); 944 945 /* 946 * If a local address or port hasn't yet been selected, or if 947 * the destination address needs to be rewritten due to using 948 * a special INADDR_ constant, invoke in_pcbconnect_setup() 949 * to do the heavy lifting. Once a port is selected, we 950 * commit the binding back to the socket; we also commit the 951 * binding of the address if in jail. 952 * 953 * If we already have a valid binding and we're not 954 * requesting a destination address rewrite, use a fast path. 955 */ 956 if (inp->inp_laddr.s_addr == INADDR_ANY || 957 inp->inp_lport == 0 || 958 sin->sin_addr.s_addr == INADDR_ANY || 959 sin->sin_addr.s_addr == INADDR_BROADCAST) { 960 INP_INFO_LOCK_ASSERT(&udbinfo); 961 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 962 &lport, &faddr.s_addr, &fport, NULL, 963 td->td_ucred); 964 if (error) 965 goto release; 966 967 /* 968 * XXXRW: Why not commit the port if the address is 969 * !INADDR_ANY? 970 */ 971 /* Commit the local port if newly assigned. */ 972 if (inp->inp_laddr.s_addr == INADDR_ANY && 973 inp->inp_lport == 0) { 974 INP_INFO_WLOCK_ASSERT(&udbinfo); 975 INP_WLOCK_ASSERT(inp); 976 /* 977 * Remember addr if jailed, to prevent 978 * rebinding. 979 */ 980 if (jailed(td->td_ucred)) 981 inp->inp_laddr = laddr; 982 inp->inp_lport = lport; 983 if (in_pcbinshash(inp) != 0) { 984 inp->inp_lport = 0; 985 error = EAGAIN; 986 goto release; 987 } 988 inp->inp_flags |= INP_ANONPORT; 989 } 990 } else { 991 faddr = sin->sin_addr; 992 fport = sin->sin_port; 993 } 994 } else { 995 INP_LOCK_ASSERT(inp); 996 faddr = inp->inp_faddr; 997 fport = inp->inp_fport; 998 if (faddr.s_addr == INADDR_ANY) { 999 error = ENOTCONN; 1000 goto release; 1001 } 1002 } 1003 1004 /* 1005 * Calculate data length and get a mbuf for UDP, IP, and possible 1006 * link-layer headers. Immediate slide the data pointer back forward 1007 * since we won't use that space at this layer. 1008 */ 1009 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 1010 if (m == NULL) { 1011 error = ENOBUFS; 1012 goto release; 1013 } 1014 m->m_data += max_linkhdr; 1015 m->m_len -= max_linkhdr; 1016 m->m_pkthdr.len -= max_linkhdr; 1017 1018 /* 1019 * Fill in mbuf with extended UDP header and addresses and length put 1020 * into network format. 1021 */ 1022 ui = mtod(m, struct udpiphdr *); 1023 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1024 ui->ui_pr = IPPROTO_UDP; 1025 ui->ui_src = laddr; 1026 ui->ui_dst = faddr; 1027 ui->ui_sport = lport; 1028 ui->ui_dport = fport; 1029 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1030 1031 /* 1032 * Set the Don't Fragment bit in the IP header. 1033 */ 1034 if (inp->inp_flags & INP_DONTFRAG) { 1035 struct ip *ip; 1036 1037 ip = (struct ip *)&ui->ui_i; 1038 ip->ip_off |= IP_DF; 1039 } 1040 1041 ipflags = 0; 1042 if (inp->inp_socket->so_options & SO_DONTROUTE) 1043 ipflags |= IP_ROUTETOIF; 1044 if (inp->inp_socket->so_options & SO_BROADCAST) 1045 ipflags |= IP_ALLOWBROADCAST; 1046 if (inp->inp_flags & INP_ONESBCAST) 1047 ipflags |= IP_SENDONES; 1048 1049 #ifdef MAC 1050 mac_create_mbuf_from_inpcb(inp, m); 1051 #endif 1052 1053 /* 1054 * Set up checksum and output datagram. 1055 */ 1056 if (udp_cksum) { 1057 if (inp->inp_flags & INP_ONESBCAST) 1058 faddr.s_addr = INADDR_BROADCAST; 1059 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1060 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 1061 m->m_pkthdr.csum_flags = CSUM_UDP; 1062 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1063 } else 1064 ui->ui_sum = 0; 1065 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 1066 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1067 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 1068 udpstat.udps_opackets++; 1069 1070 if (unlock_udbinfo == 2) 1071 INP_INFO_WUNLOCK(&udbinfo); 1072 else if (unlock_udbinfo == 1) 1073 INP_INFO_RUNLOCK(&udbinfo); 1074 error = ip_output(m, inp->inp_options, NULL, ipflags, 1075 inp->inp_moptions, inp); 1076 if (unlock_udbinfo == 2) 1077 INP_WUNLOCK(inp); 1078 else 1079 INP_RUNLOCK(inp); 1080 return (error); 1081 1082 release: 1083 if (unlock_udbinfo == 2) { 1084 INP_WUNLOCK(inp); 1085 INP_INFO_WUNLOCK(&udbinfo); 1086 } else if (unlock_udbinfo == 1) { 1087 INP_RUNLOCK(inp); 1088 INP_INFO_RUNLOCK(&udbinfo); 1089 } else 1090 INP_RUNLOCK(inp); 1091 m_freem(m); 1092 return (error); 1093 } 1094 1095 static void 1096 udp_abort(struct socket *so) 1097 { 1098 struct inpcb *inp; 1099 1100 inp = sotoinpcb(so); 1101 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1102 INP_INFO_WLOCK(&udbinfo); 1103 INP_WLOCK(inp); 1104 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1105 in_pcbdisconnect(inp); 1106 inp->inp_laddr.s_addr = INADDR_ANY; 1107 soisdisconnected(so); 1108 } 1109 INP_WUNLOCK(inp); 1110 INP_INFO_WUNLOCK(&udbinfo); 1111 } 1112 1113 static int 1114 udp_attach(struct socket *so, int proto, struct thread *td) 1115 { 1116 struct inpcb *inp; 1117 int error; 1118 1119 inp = sotoinpcb(so); 1120 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1121 error = soreserve(so, udp_sendspace, udp_recvspace); 1122 if (error) 1123 return (error); 1124 INP_INFO_WLOCK(&udbinfo); 1125 error = in_pcballoc(so, &udbinfo); 1126 if (error) { 1127 INP_INFO_WUNLOCK(&udbinfo); 1128 return (error); 1129 } 1130 1131 inp = (struct inpcb *)so->so_pcb; 1132 INP_INFO_WUNLOCK(&udbinfo); 1133 inp->inp_vflag |= INP_IPV4; 1134 inp->inp_ip_ttl = ip_defttl; 1135 INP_WUNLOCK(inp); 1136 return (0); 1137 } 1138 1139 static int 1140 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1141 { 1142 struct inpcb *inp; 1143 int error; 1144 1145 inp = sotoinpcb(so); 1146 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1147 INP_INFO_WLOCK(&udbinfo); 1148 INP_WLOCK(inp); 1149 error = in_pcbbind(inp, nam, td->td_ucred); 1150 INP_WUNLOCK(inp); 1151 INP_INFO_WUNLOCK(&udbinfo); 1152 return (error); 1153 } 1154 1155 static void 1156 udp_close(struct socket *so) 1157 { 1158 struct inpcb *inp; 1159 1160 inp = sotoinpcb(so); 1161 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1162 INP_INFO_WLOCK(&udbinfo); 1163 INP_WLOCK(inp); 1164 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1165 in_pcbdisconnect(inp); 1166 inp->inp_laddr.s_addr = INADDR_ANY; 1167 soisdisconnected(so); 1168 } 1169 INP_WUNLOCK(inp); 1170 INP_INFO_WUNLOCK(&udbinfo); 1171 } 1172 1173 static int 1174 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1175 { 1176 struct inpcb *inp; 1177 int error; 1178 struct sockaddr_in *sin; 1179 1180 inp = sotoinpcb(so); 1181 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1182 INP_INFO_WLOCK(&udbinfo); 1183 INP_WLOCK(inp); 1184 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1185 INP_WUNLOCK(inp); 1186 INP_INFO_WUNLOCK(&udbinfo); 1187 return (EISCONN); 1188 } 1189 sin = (struct sockaddr_in *)nam; 1190 if (jailed(td->td_ucred)) 1191 prison_remote_ip(td->td_ucred, 0, &sin->sin_addr.s_addr); 1192 error = in_pcbconnect(inp, nam, td->td_ucred); 1193 if (error == 0) 1194 soisconnected(so); 1195 INP_WUNLOCK(inp); 1196 INP_INFO_WUNLOCK(&udbinfo); 1197 return (error); 1198 } 1199 1200 static void 1201 udp_detach(struct socket *so) 1202 { 1203 struct inpcb *inp; 1204 1205 inp = sotoinpcb(so); 1206 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1207 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1208 ("udp_detach: not disconnected")); 1209 INP_INFO_WLOCK(&udbinfo); 1210 INP_WLOCK(inp); 1211 in_pcbdetach(inp); 1212 in_pcbfree(inp); 1213 INP_INFO_WUNLOCK(&udbinfo); 1214 } 1215 1216 static int 1217 udp_disconnect(struct socket *so) 1218 { 1219 struct inpcb *inp; 1220 1221 inp = sotoinpcb(so); 1222 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1223 INP_INFO_WLOCK(&udbinfo); 1224 INP_WLOCK(inp); 1225 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1226 INP_WUNLOCK(inp); 1227 INP_INFO_WUNLOCK(&udbinfo); 1228 return (ENOTCONN); 1229 } 1230 1231 in_pcbdisconnect(inp); 1232 inp->inp_laddr.s_addr = INADDR_ANY; 1233 SOCK_LOCK(so); 1234 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1235 SOCK_UNLOCK(so); 1236 INP_WUNLOCK(inp); 1237 INP_INFO_WUNLOCK(&udbinfo); 1238 return (0); 1239 } 1240 1241 static int 1242 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1243 struct mbuf *control, struct thread *td) 1244 { 1245 struct inpcb *inp; 1246 1247 inp = sotoinpcb(so); 1248 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1249 return (udp_output(inp, m, addr, control, td)); 1250 } 1251 1252 int 1253 udp_shutdown(struct socket *so) 1254 { 1255 struct inpcb *inp; 1256 1257 inp = sotoinpcb(so); 1258 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1259 INP_WLOCK(inp); 1260 socantsendmore(so); 1261 INP_WUNLOCK(inp); 1262 return (0); 1263 } 1264 1265 struct pr_usrreqs udp_usrreqs = { 1266 .pru_abort = udp_abort, 1267 .pru_attach = udp_attach, 1268 .pru_bind = udp_bind, 1269 .pru_connect = udp_connect, 1270 .pru_control = in_control, 1271 .pru_detach = udp_detach, 1272 .pru_disconnect = udp_disconnect, 1273 .pru_peeraddr = in_getpeeraddr, 1274 .pru_send = udp_send, 1275 .pru_sosend = sosend_dgram, 1276 .pru_shutdown = udp_shutdown, 1277 .pru_sockaddr = in_getsockaddr, 1278 .pru_sosetlabel = in_pcbsosetlabel, 1279 .pru_close = udp_close, 1280 };
Cache object: e0fde8365644423f26b57de542447019
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