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 #include <sys/vimage.h> 61 62 #include <vm/uma.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_pcb.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #ifdef INET6 73 #include <netinet/ip6.h> 74 #endif 75 #include <netinet/ip_icmp.h> 76 #include <netinet/icmp_var.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/ip_options.h> 79 #ifdef INET6 80 #include <netinet6/ip6_var.h> 81 #endif 82 #include <netinet/udp.h> 83 #include <netinet/udp_var.h> 84 #include <netinet/vinet.h> 85 86 #ifdef IPSEC 87 #include <netipsec/ipsec.h> 88 #endif 89 90 #include <machine/in_cksum.h> 91 92 #include <security/mac/mac_framework.h> 93 94 /* 95 * UDP protocol implementation. 96 * Per RFC 768, August, 1980. 97 */ 98 99 #ifdef VIMAGE_GLOBALS 100 int udp_blackhole; 101 #endif 102 103 /* 104 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums 105 * removes the only data integrity mechanism for packets and malformed 106 * packets that would otherwise be discarded due to bad checksums, and may 107 * cause problems (especially for NFS data blocks). 108 */ 109 static int udp_cksum = 1; 110 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum, 111 0, "compute udp checksum"); 112 113 int udp_log_in_vain = 0; 114 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 115 &udp_log_in_vain, 0, "Log all incoming UDP packets"); 116 117 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_udp, OID_AUTO, blackhole, 118 CTLFLAG_RW, udp_blackhole, 0, 119 "Do not send port unreachables for refused connects"); 120 121 u_long udp_sendspace = 9216; /* really max datagram size */ 122 /* 40 1K datagrams */ 123 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 124 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 125 126 u_long udp_recvspace = 40 * (1024 + 127 #ifdef INET6 128 sizeof(struct sockaddr_in6) 129 #else 130 sizeof(struct sockaddr_in) 131 #endif 132 ); 133 134 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 135 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 136 137 #ifdef VIMAGE_GLOBALS 138 struct inpcbhead udb; /* from udp_var.h */ 139 struct inpcbinfo udbinfo; 140 struct udpstat udpstat; /* from udp_var.h */ 141 #endif 142 143 #ifndef UDBHASHSIZE 144 #define UDBHASHSIZE 128 145 #endif 146 147 SYSCTL_V_STRUCT(V_NET, vnet_inet, _net_inet_udp, UDPCTL_STATS, stats, 148 CTLFLAG_RW, udpstat, udpstat, 149 "UDP statistics (struct udpstat, netinet/udp_var.h)"); 150 151 static void udp_detach(struct socket *so); 152 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 153 struct mbuf *, struct thread *); 154 155 static void 156 udp_zone_change(void *tag) 157 { 158 INIT_VNET_INET(curvnet); 159 160 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); 161 } 162 163 static int 164 udp_inpcb_init(void *mem, int size, int flags) 165 { 166 struct inpcb *inp; 167 168 inp = mem; 169 INP_LOCK_INIT(inp, "inp", "udpinp"); 170 return (0); 171 } 172 173 void 174 udp_init(void) 175 { 176 INIT_VNET_INET(curvnet); 177 178 V_udp_blackhole = 0; 179 180 INP_INFO_LOCK_INIT(&V_udbinfo, "udp"); 181 LIST_INIT(&V_udb); 182 #ifdef VIMAGE 183 V_udbinfo.ipi_vnet = curvnet; 184 #endif 185 V_udbinfo.ipi_listhead = &V_udb; 186 V_udbinfo.ipi_hashbase = hashinit(UDBHASHSIZE, M_PCB, 187 &V_udbinfo.ipi_hashmask); 188 V_udbinfo.ipi_porthashbase = hashinit(UDBHASHSIZE, M_PCB, 189 &V_udbinfo.ipi_porthashmask); 190 V_udbinfo.ipi_zone = uma_zcreate("udpcb", sizeof(struct inpcb), NULL, 191 NULL, udp_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 192 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); 193 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 194 EVENTHANDLER_PRI_ANY); 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 INIT_VNET_IPSEC(curvnet); 221 m_freem(n); 222 V_ipsec4stat.in_polvio++; 223 return; 224 } 225 #endif /* IPSEC */ 226 #ifdef MAC 227 if (mac_inpcb_check_deliver(inp, n) != 0) { 228 m_freem(n); 229 return; 230 } 231 #endif 232 if (inp->inp_flags & INP_CONTROLOPTS || 233 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 234 #ifdef INET6 235 if (inp->inp_vflag & INP_IPV6) 236 (void)ip6_savecontrol_v4(inp, n, &opts, NULL); 237 else 238 #endif 239 ip_savecontrol(inp, &opts, ip, n); 240 } 241 #ifdef INET6 242 if (inp->inp_vflag & INP_IPV6) { 243 bzero(&udp_in6, sizeof(udp_in6)); 244 udp_in6.sin6_len = sizeof(udp_in6); 245 udp_in6.sin6_family = AF_INET6; 246 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 247 append_sa = (struct sockaddr *)&udp_in6; 248 } else 249 #endif 250 append_sa = (struct sockaddr *)udp_in; 251 m_adj(n, off); 252 253 so = inp->inp_socket; 254 SOCKBUF_LOCK(&so->so_rcv); 255 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 256 INIT_VNET_INET(so->so_vnet); 257 SOCKBUF_UNLOCK(&so->so_rcv); 258 m_freem(n); 259 if (opts) 260 m_freem(opts); 261 UDPSTAT_INC(udps_fullsock); 262 } else 263 sorwakeup_locked(so); 264 } 265 266 void 267 udp_input(struct mbuf *m, int off) 268 { 269 INIT_VNET_INET(curvnet); 270 int iphlen = off; 271 struct ip *ip; 272 struct udphdr *uh; 273 struct ifnet *ifp; 274 struct inpcb *inp; 275 int len; 276 struct ip save_ip; 277 struct sockaddr_in udp_in; 278 #ifdef IPFIREWALL_FORWARD 279 struct m_tag *fwd_tag; 280 #endif 281 282 ifp = m->m_pkthdr.rcvif; 283 UDPSTAT_INC(udps_ipackets); 284 285 /* 286 * Strip IP options, if any; should skip this, make available to 287 * user, and use on returned packets, but we don't yet have a way to 288 * check the checksum with options still present. 289 */ 290 if (iphlen > sizeof (struct ip)) { 291 ip_stripoptions(m, (struct mbuf *)0); 292 iphlen = sizeof(struct ip); 293 } 294 295 /* 296 * Get IP and UDP header together in first mbuf. 297 */ 298 ip = mtod(m, struct ip *); 299 if (m->m_len < iphlen + sizeof(struct udphdr)) { 300 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 301 UDPSTAT_INC(udps_hdrops); 302 return; 303 } 304 ip = mtod(m, struct ip *); 305 } 306 uh = (struct udphdr *)((caddr_t)ip + iphlen); 307 308 /* 309 * Destination port of 0 is illegal, based on RFC768. 310 */ 311 if (uh->uh_dport == 0) 312 goto badunlocked; 313 314 /* 315 * Construct sockaddr format source address. Stuff source address 316 * and datagram in user buffer. 317 */ 318 bzero(&udp_in, sizeof(udp_in)); 319 udp_in.sin_len = sizeof(udp_in); 320 udp_in.sin_family = AF_INET; 321 udp_in.sin_port = uh->uh_sport; 322 udp_in.sin_addr = ip->ip_src; 323 324 /* 325 * Make mbuf data length reflect UDP length. If not enough data to 326 * reflect UDP length, drop. 327 */ 328 len = ntohs((u_short)uh->uh_ulen); 329 if (ip->ip_len != len) { 330 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 331 UDPSTAT_INC(udps_badlen); 332 goto badunlocked; 333 } 334 m_adj(m, len - ip->ip_len); 335 /* ip->ip_len = len; */ 336 } 337 338 /* 339 * Save a copy of the IP header in case we want restore it for 340 * sending an ICMP error message in response. 341 */ 342 if (!V_udp_blackhole) 343 save_ip = *ip; 344 else 345 memset(&save_ip, 0, sizeof(save_ip)); 346 347 /* 348 * Checksum extended UDP header and data. 349 */ 350 if (uh->uh_sum) { 351 u_short uh_sum; 352 353 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 354 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 355 uh_sum = m->m_pkthdr.csum_data; 356 else 357 uh_sum = in_pseudo(ip->ip_src.s_addr, 358 ip->ip_dst.s_addr, htonl((u_short)len + 359 m->m_pkthdr.csum_data + IPPROTO_UDP)); 360 uh_sum ^= 0xffff; 361 } else { 362 char b[9]; 363 364 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 365 bzero(((struct ipovly *)ip)->ih_x1, 9); 366 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 367 uh_sum = in_cksum(m, len + sizeof (struct ip)); 368 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 369 } 370 if (uh_sum) { 371 UDPSTAT_INC(udps_badsum); 372 m_freem(m); 373 return; 374 } 375 } else 376 UDPSTAT_INC(udps_nosum); 377 378 #ifdef IPFIREWALL_FORWARD 379 /* 380 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 381 */ 382 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 383 if (fwd_tag != NULL) { 384 struct sockaddr_in *next_hop; 385 386 /* 387 * Do the hack. 388 */ 389 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 390 ip->ip_dst = next_hop->sin_addr; 391 uh->uh_dport = ntohs(next_hop->sin_port); 392 393 /* 394 * Remove the tag from the packet. We don't need it anymore. 395 */ 396 m_tag_delete(m, fwd_tag); 397 } 398 #endif 399 400 INP_INFO_RLOCK(&V_udbinfo); 401 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 402 in_broadcast(ip->ip_dst, ifp)) { 403 struct inpcb *last; 404 struct ip_moptions *imo; 405 406 last = NULL; 407 LIST_FOREACH(inp, &V_udb, inp_list) { 408 if (inp->inp_lport != uh->uh_dport) 409 continue; 410 #ifdef INET6 411 if ((inp->inp_vflag & INP_IPV4) == 0) 412 continue; 413 #endif 414 if (inp->inp_laddr.s_addr != INADDR_ANY && 415 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 416 continue; 417 if (inp->inp_faddr.s_addr != INADDR_ANY && 418 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 419 continue; 420 if (inp->inp_fport != 0 && 421 inp->inp_fport != uh->uh_sport) 422 continue; 423 424 INP_RLOCK(inp); 425 426 /* 427 * Handle socket delivery policy for any-source 428 * and source-specific multicast. [RFC3678] 429 */ 430 imo = inp->inp_moptions; 431 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 432 imo != NULL) { 433 struct sockaddr_in group; 434 int blocked; 435 436 bzero(&group, sizeof(struct sockaddr_in)); 437 group.sin_len = sizeof(struct sockaddr_in); 438 group.sin_family = AF_INET; 439 group.sin_addr = ip->ip_dst; 440 441 blocked = imo_multi_filter(imo, ifp, 442 (struct sockaddr *)&group, 443 (struct sockaddr *)&udp_in); 444 if (blocked != MCAST_PASS) { 445 if (blocked == MCAST_NOTGMEMBER) 446 IPSTAT_INC(ips_notmember); 447 if (blocked == MCAST_NOTSMEMBER || 448 blocked == MCAST_MUTED) 449 UDPSTAT_INC(udps_filtermcast); 450 INP_RUNLOCK(inp); 451 continue; 452 } 453 } 454 if (last != NULL) { 455 struct mbuf *n; 456 457 n = m_copy(m, 0, M_COPYALL); 458 if (last->inp_ppcb == NULL) { 459 if (n != NULL) 460 udp_append(last, 461 ip, n, 462 iphlen + 463 sizeof(struct udphdr), 464 &udp_in); 465 INP_RUNLOCK(last); 466 } else { 467 /* 468 * Engage the tunneling protocol we 469 * will have to leave the info_lock 470 * up, since we are hunting through 471 * multiple UDP's. 472 * 473 */ 474 udp_tun_func_t tunnel_func; 475 476 tunnel_func = (udp_tun_func_t)last->inp_ppcb; 477 tunnel_func(n, iphlen, last); 478 INP_RUNLOCK(last); 479 } 480 } 481 last = inp; 482 /* 483 * Don't look for additional matches if this one does 484 * not have either the SO_REUSEPORT or SO_REUSEADDR 485 * socket options set. This heuristic avoids 486 * searching through all pcbs in the common case of a 487 * non-shared port. It assumes that an application 488 * will never clear these options after setting them. 489 */ 490 if ((last->inp_socket->so_options & 491 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 492 break; 493 } 494 495 if (last == NULL) { 496 /* 497 * No matching pcb found; discard datagram. (No need 498 * to send an ICMP Port Unreachable for a broadcast 499 * or multicast datgram.) 500 */ 501 UDPSTAT_INC(udps_noportbcast); 502 goto badheadlocked; 503 } 504 if (last->inp_ppcb == NULL) { 505 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 506 &udp_in); 507 INP_RUNLOCK(last); 508 INP_INFO_RUNLOCK(&V_udbinfo); 509 } else { 510 /* 511 * Engage the tunneling protocol. 512 */ 513 udp_tun_func_t tunnel_func; 514 515 tunnel_func = (udp_tun_func_t)last->inp_ppcb; 516 tunnel_func(m, iphlen, last); 517 INP_RUNLOCK(last); 518 INP_INFO_RUNLOCK(&V_udbinfo); 519 } 520 return; 521 } 522 523 /* 524 * Locate pcb for datagram. 525 */ 526 inp = in_pcblookup_hash(&V_udbinfo, ip->ip_src, uh->uh_sport, 527 ip->ip_dst, uh->uh_dport, 1, ifp); 528 if (inp == NULL) { 529 if (udp_log_in_vain) { 530 char buf[4*sizeof "123"]; 531 532 strcpy(buf, inet_ntoa(ip->ip_dst)); 533 log(LOG_INFO, 534 "Connection attempt to UDP %s:%d from %s:%d\n", 535 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 536 ntohs(uh->uh_sport)); 537 } 538 UDPSTAT_INC(udps_noport); 539 if (m->m_flags & (M_BCAST | M_MCAST)) { 540 UDPSTAT_INC(udps_noportbcast); 541 goto badheadlocked; 542 } 543 if (V_udp_blackhole) 544 goto badheadlocked; 545 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 546 goto badheadlocked; 547 *ip = save_ip; 548 ip->ip_len += iphlen; 549 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 550 INP_INFO_RUNLOCK(&V_udbinfo); 551 return; 552 } 553 554 /* 555 * Check the minimum TTL for socket. 556 */ 557 INP_RLOCK(inp); 558 INP_INFO_RUNLOCK(&V_udbinfo); 559 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 560 INP_RUNLOCK(inp); 561 goto badunlocked; 562 } 563 if (inp->inp_ppcb != NULL) { 564 /* 565 * Engage the tunneling protocol. 566 */ 567 udp_tun_func_t tunnel_func; 568 569 tunnel_func = (udp_tun_func_t)inp->inp_ppcb; 570 tunnel_func(m, iphlen, inp); 571 INP_RUNLOCK(inp); 572 return; 573 } 574 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 575 INP_RUNLOCK(inp); 576 return; 577 578 badheadlocked: 579 if (inp) 580 INP_RUNLOCK(inp); 581 INP_INFO_RUNLOCK(&V_udbinfo); 582 badunlocked: 583 m_freem(m); 584 } 585 586 /* 587 * Notify a udp user of an asynchronous error; just wake up so that they can 588 * collect error status. 589 */ 590 struct inpcb * 591 udp_notify(struct inpcb *inp, int errno) 592 { 593 594 /* 595 * While udp_ctlinput() always calls udp_notify() with a read lock 596 * when invoking it directly, in_pcbnotifyall() currently uses write 597 * locks due to sharing code with TCP. For now, accept either a read 598 * or a write lock, but a read lock is sufficient. 599 */ 600 INP_LOCK_ASSERT(inp); 601 602 inp->inp_socket->so_error = errno; 603 sorwakeup(inp->inp_socket); 604 sowwakeup(inp->inp_socket); 605 return (inp); 606 } 607 608 void 609 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 610 { 611 INIT_VNET_INET(curvnet); 612 struct ip *ip = vip; 613 struct udphdr *uh; 614 struct in_addr faddr; 615 struct inpcb *inp; 616 617 faddr = ((struct sockaddr_in *)sa)->sin_addr; 618 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 619 return; 620 621 /* 622 * Redirects don't need to be handled up here. 623 */ 624 if (PRC_IS_REDIRECT(cmd)) 625 return; 626 627 /* 628 * Hostdead is ugly because it goes linearly through all PCBs. 629 * 630 * XXX: We never get this from ICMP, otherwise it makes an excellent 631 * DoS attack on machines with many connections. 632 */ 633 if (cmd == PRC_HOSTDEAD) 634 ip = NULL; 635 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 636 return; 637 if (ip != NULL) { 638 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 639 INP_INFO_RLOCK(&V_udbinfo); 640 inp = in_pcblookup_hash(&V_udbinfo, faddr, uh->uh_dport, 641 ip->ip_src, uh->uh_sport, 0, NULL); 642 if (inp != NULL) { 643 INP_RLOCK(inp); 644 if (inp->inp_socket != NULL) { 645 udp_notify(inp, inetctlerrmap[cmd]); 646 } 647 INP_RUNLOCK(inp); 648 } 649 INP_INFO_RUNLOCK(&V_udbinfo); 650 } else 651 in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd], 652 udp_notify); 653 } 654 655 static int 656 udp_pcblist(SYSCTL_HANDLER_ARGS) 657 { 658 INIT_VNET_INET(curvnet); 659 int error, i, n; 660 struct inpcb *inp, **inp_list; 661 inp_gen_t gencnt; 662 struct xinpgen xig; 663 664 /* 665 * The process of preparing the PCB list is too time-consuming and 666 * resource-intensive to repeat twice on every request. 667 */ 668 if (req->oldptr == 0) { 669 n = V_udbinfo.ipi_count; 670 req->oldidx = 2 * (sizeof xig) 671 + (n + n/8) * sizeof(struct xinpcb); 672 return (0); 673 } 674 675 if (req->newptr != 0) 676 return (EPERM); 677 678 /* 679 * OK, now we're committed to doing something. 680 */ 681 INP_INFO_RLOCK(&V_udbinfo); 682 gencnt = V_udbinfo.ipi_gencnt; 683 n = V_udbinfo.ipi_count; 684 INP_INFO_RUNLOCK(&V_udbinfo); 685 686 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 687 + n * sizeof(struct xinpcb)); 688 if (error != 0) 689 return (error); 690 691 xig.xig_len = sizeof xig; 692 xig.xig_count = n; 693 xig.xig_gen = gencnt; 694 xig.xig_sogen = so_gencnt; 695 error = SYSCTL_OUT(req, &xig, sizeof xig); 696 if (error) 697 return (error); 698 699 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 700 if (inp_list == 0) 701 return (ENOMEM); 702 703 INP_INFO_RLOCK(&V_udbinfo); 704 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; 705 inp = LIST_NEXT(inp, inp_list)) { 706 INP_RLOCK(inp); 707 if (inp->inp_gencnt <= gencnt && 708 cr_canseeinpcb(req->td->td_ucred, inp) == 0) 709 inp_list[i++] = inp; 710 INP_RUNLOCK(inp); 711 } 712 INP_INFO_RUNLOCK(&V_udbinfo); 713 n = i; 714 715 error = 0; 716 for (i = 0; i < n; i++) { 717 inp = inp_list[i]; 718 INP_RLOCK(inp); 719 if (inp->inp_gencnt <= gencnt) { 720 struct xinpcb xi; 721 bzero(&xi, sizeof(xi)); 722 xi.xi_len = sizeof xi; 723 /* XXX should avoid extra copy */ 724 bcopy(inp, &xi.xi_inp, sizeof *inp); 725 if (inp->inp_socket) 726 sotoxsocket(inp->inp_socket, &xi.xi_socket); 727 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 728 INP_RUNLOCK(inp); 729 error = SYSCTL_OUT(req, &xi, sizeof xi); 730 } else 731 INP_RUNLOCK(inp); 732 } 733 if (!error) { 734 /* 735 * Give the user an updated idea of our state. If the 736 * generation differs from what we told her before, she knows 737 * that something happened while we were processing this 738 * request, and it might be necessary to retry. 739 */ 740 INP_INFO_RLOCK(&V_udbinfo); 741 xig.xig_gen = V_udbinfo.ipi_gencnt; 742 xig.xig_sogen = so_gencnt; 743 xig.xig_count = V_udbinfo.ipi_count; 744 INP_INFO_RUNLOCK(&V_udbinfo); 745 error = SYSCTL_OUT(req, &xig, sizeof xig); 746 } 747 free(inp_list, M_TEMP); 748 return (error); 749 } 750 751 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 752 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 753 754 static int 755 udp_getcred(SYSCTL_HANDLER_ARGS) 756 { 757 INIT_VNET_INET(curvnet); 758 struct xucred xuc; 759 struct sockaddr_in addrs[2]; 760 struct inpcb *inp; 761 int error; 762 763 error = priv_check(req->td, PRIV_NETINET_GETCRED); 764 if (error) 765 return (error); 766 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 767 if (error) 768 return (error); 769 INP_INFO_RLOCK(&V_udbinfo); 770 inp = in_pcblookup_hash(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 771 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 772 if (inp != NULL) { 773 INP_RLOCK(inp); 774 INP_INFO_RUNLOCK(&V_udbinfo); 775 if (inp->inp_socket == NULL) 776 error = ENOENT; 777 if (error == 0) 778 error = cr_canseeinpcb(req->td->td_ucred, inp); 779 if (error == 0) 780 cru2x(inp->inp_cred, &xuc); 781 INP_RUNLOCK(inp); 782 } else { 783 INP_INFO_RUNLOCK(&V_udbinfo); 784 error = ENOENT; 785 } 786 if (error == 0) 787 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 788 return (error); 789 } 790 791 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 792 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 793 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 794 795 static int 796 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 797 struct mbuf *control, struct thread *td) 798 { 799 INIT_VNET_INET(inp->inp_vnet); 800 struct udpiphdr *ui; 801 int len = m->m_pkthdr.len; 802 struct in_addr faddr, laddr; 803 struct cmsghdr *cm; 804 struct sockaddr_in *sin, src; 805 int error = 0; 806 int ipflags; 807 u_short fport, lport; 808 int unlock_udbinfo; 809 810 /* 811 * udp_output() may need to temporarily bind or connect the current 812 * inpcb. As such, we don't know up front whether we will need the 813 * pcbinfo lock or not. Do any work to decide what is needed up 814 * front before acquiring any locks. 815 */ 816 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 817 if (control) 818 m_freem(control); 819 m_freem(m); 820 return (EMSGSIZE); 821 } 822 823 src.sin_family = 0; 824 if (control != NULL) { 825 /* 826 * XXX: Currently, we assume all the optional information is 827 * stored in a single mbuf. 828 */ 829 if (control->m_next) { 830 m_freem(control); 831 m_freem(m); 832 return (EINVAL); 833 } 834 for (; control->m_len > 0; 835 control->m_data += CMSG_ALIGN(cm->cmsg_len), 836 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 837 cm = mtod(control, struct cmsghdr *); 838 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 839 || cm->cmsg_len > control->m_len) { 840 error = EINVAL; 841 break; 842 } 843 if (cm->cmsg_level != IPPROTO_IP) 844 continue; 845 846 switch (cm->cmsg_type) { 847 case IP_SENDSRCADDR: 848 if (cm->cmsg_len != 849 CMSG_LEN(sizeof(struct in_addr))) { 850 error = EINVAL; 851 break; 852 } 853 bzero(&src, sizeof(src)); 854 src.sin_family = AF_INET; 855 src.sin_len = sizeof(src); 856 src.sin_port = inp->inp_lport; 857 src.sin_addr = 858 *(struct in_addr *)CMSG_DATA(cm); 859 break; 860 861 default: 862 error = ENOPROTOOPT; 863 break; 864 } 865 if (error) 866 break; 867 } 868 m_freem(control); 869 } 870 if (error) { 871 m_freem(m); 872 return (error); 873 } 874 875 /* 876 * Depending on whether or not the application has bound or connected 877 * the socket, we may have to do varying levels of work. The optimal 878 * case is for a connected UDP socket, as a global lock isn't 879 * required at all. 880 * 881 * In order to decide which we need, we require stability of the 882 * inpcb binding, which we ensure by acquiring a read lock on the 883 * inpcb. This doesn't strictly follow the lock order, so we play 884 * the trylock and retry game; note that we may end up with more 885 * conservative locks than required the second time around, so later 886 * assertions have to accept that. Further analysis of the number of 887 * misses under contention is required. 888 */ 889 sin = (struct sockaddr_in *)addr; 890 INP_RLOCK(inp); 891 if (sin != NULL && 892 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 893 INP_RUNLOCK(inp); 894 INP_INFO_WLOCK(&V_udbinfo); 895 INP_WLOCK(inp); 896 unlock_udbinfo = 2; 897 } else if ((sin != NULL && ( 898 (sin->sin_addr.s_addr == INADDR_ANY) || 899 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 900 (inp->inp_laddr.s_addr == INADDR_ANY) || 901 (inp->inp_lport == 0))) || 902 (src.sin_family == AF_INET)) { 903 if (!INP_INFO_TRY_RLOCK(&V_udbinfo)) { 904 INP_RUNLOCK(inp); 905 INP_INFO_RLOCK(&V_udbinfo); 906 INP_RLOCK(inp); 907 } 908 unlock_udbinfo = 1; 909 } else 910 unlock_udbinfo = 0; 911 912 /* 913 * If the IP_SENDSRCADDR control message was specified, override the 914 * source address for this datagram. Its use is invalidated if the 915 * address thus specified is incomplete or clobbers other inpcbs. 916 */ 917 laddr = inp->inp_laddr; 918 lport = inp->inp_lport; 919 if (src.sin_family == AF_INET) { 920 INP_INFO_LOCK_ASSERT(&V_udbinfo); 921 if ((lport == 0) || 922 (laddr.s_addr == INADDR_ANY && 923 src.sin_addr.s_addr == INADDR_ANY)) { 924 error = EINVAL; 925 goto release; 926 } 927 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 928 &laddr.s_addr, &lport, td->td_ucred); 929 if (error) 930 goto release; 931 } 932 933 /* 934 * If a UDP socket has been connected, then a local address/port will 935 * have been selected and bound. 936 * 937 * If a UDP socket has not been connected to, then an explicit 938 * destination address must be used, in which case a local 939 * address/port may not have been selected and bound. 940 */ 941 if (sin != NULL) { 942 INP_LOCK_ASSERT(inp); 943 if (inp->inp_faddr.s_addr != INADDR_ANY) { 944 error = EISCONN; 945 goto release; 946 } 947 948 /* 949 * Jail may rewrite the destination address, so let it do 950 * that before we use it. 951 */ 952 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 953 if (error) 954 goto release; 955 956 /* 957 * If a local address or port hasn't yet been selected, or if 958 * the destination address needs to be rewritten due to using 959 * a special INADDR_ constant, invoke in_pcbconnect_setup() 960 * to do the heavy lifting. Once a port is selected, we 961 * commit the binding back to the socket; we also commit the 962 * binding of the address if in jail. 963 * 964 * If we already have a valid binding and we're not 965 * requesting a destination address rewrite, use a fast path. 966 */ 967 if (inp->inp_laddr.s_addr == INADDR_ANY || 968 inp->inp_lport == 0 || 969 sin->sin_addr.s_addr == INADDR_ANY || 970 sin->sin_addr.s_addr == INADDR_BROADCAST) { 971 INP_INFO_LOCK_ASSERT(&V_udbinfo); 972 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 973 &lport, &faddr.s_addr, &fport, NULL, 974 td->td_ucred); 975 if (error) 976 goto release; 977 978 /* 979 * XXXRW: Why not commit the port if the address is 980 * !INADDR_ANY? 981 */ 982 /* Commit the local port if newly assigned. */ 983 if (inp->inp_laddr.s_addr == INADDR_ANY && 984 inp->inp_lport == 0) { 985 INP_INFO_WLOCK_ASSERT(&V_udbinfo); 986 INP_WLOCK_ASSERT(inp); 987 /* 988 * Remember addr if jailed, to prevent 989 * rebinding. 990 */ 991 if (jailed(td->td_ucred)) 992 inp->inp_laddr = laddr; 993 inp->inp_lport = lport; 994 if (in_pcbinshash(inp) != 0) { 995 inp->inp_lport = 0; 996 error = EAGAIN; 997 goto release; 998 } 999 inp->inp_flags |= INP_ANONPORT; 1000 } 1001 } else { 1002 faddr = sin->sin_addr; 1003 fport = sin->sin_port; 1004 } 1005 } else { 1006 INP_LOCK_ASSERT(inp); 1007 faddr = inp->inp_faddr; 1008 fport = inp->inp_fport; 1009 if (faddr.s_addr == INADDR_ANY) { 1010 error = ENOTCONN; 1011 goto release; 1012 } 1013 } 1014 1015 /* 1016 * Calculate data length and get a mbuf for UDP, IP, and possible 1017 * link-layer headers. Immediate slide the data pointer back forward 1018 * since we won't use that space at this layer. 1019 */ 1020 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 1021 if (m == NULL) { 1022 error = ENOBUFS; 1023 goto release; 1024 } 1025 m->m_data += max_linkhdr; 1026 m->m_len -= max_linkhdr; 1027 m->m_pkthdr.len -= max_linkhdr; 1028 1029 /* 1030 * Fill in mbuf with extended UDP header and addresses and length put 1031 * into network format. 1032 */ 1033 ui = mtod(m, struct udpiphdr *); 1034 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1035 ui->ui_pr = IPPROTO_UDP; 1036 ui->ui_src = laddr; 1037 ui->ui_dst = faddr; 1038 ui->ui_sport = lport; 1039 ui->ui_dport = fport; 1040 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1041 1042 /* 1043 * Set the Don't Fragment bit in the IP header. 1044 */ 1045 if (inp->inp_flags & INP_DONTFRAG) { 1046 struct ip *ip; 1047 1048 ip = (struct ip *)&ui->ui_i; 1049 ip->ip_off |= IP_DF; 1050 } 1051 1052 ipflags = 0; 1053 if (inp->inp_socket->so_options & SO_DONTROUTE) 1054 ipflags |= IP_ROUTETOIF; 1055 if (inp->inp_socket->so_options & SO_BROADCAST) 1056 ipflags |= IP_ALLOWBROADCAST; 1057 if (inp->inp_flags & INP_ONESBCAST) 1058 ipflags |= IP_SENDONES; 1059 1060 #ifdef MAC 1061 mac_inpcb_create_mbuf(inp, m); 1062 #endif 1063 1064 /* 1065 * Set up checksum and output datagram. 1066 */ 1067 if (udp_cksum) { 1068 if (inp->inp_flags & INP_ONESBCAST) 1069 faddr.s_addr = INADDR_BROADCAST; 1070 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1071 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 1072 m->m_pkthdr.csum_flags = CSUM_UDP; 1073 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1074 } else 1075 ui->ui_sum = 0; 1076 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 1077 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1078 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 1079 UDPSTAT_INC(udps_opackets); 1080 1081 if (unlock_udbinfo == 2) 1082 INP_INFO_WUNLOCK(&V_udbinfo); 1083 else if (unlock_udbinfo == 1) 1084 INP_INFO_RUNLOCK(&V_udbinfo); 1085 error = ip_output(m, inp->inp_options, NULL, ipflags, 1086 inp->inp_moptions, inp); 1087 if (unlock_udbinfo == 2) 1088 INP_WUNLOCK(inp); 1089 else 1090 INP_RUNLOCK(inp); 1091 return (error); 1092 1093 release: 1094 if (unlock_udbinfo == 2) { 1095 INP_WUNLOCK(inp); 1096 INP_INFO_WUNLOCK(&V_udbinfo); 1097 } else if (unlock_udbinfo == 1) { 1098 INP_RUNLOCK(inp); 1099 INP_INFO_RUNLOCK(&V_udbinfo); 1100 } else 1101 INP_RUNLOCK(inp); 1102 m_freem(m); 1103 return (error); 1104 } 1105 1106 static void 1107 udp_abort(struct socket *so) 1108 { 1109 INIT_VNET_INET(so->so_vnet); 1110 struct inpcb *inp; 1111 1112 inp = sotoinpcb(so); 1113 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1114 INP_INFO_WLOCK(&V_udbinfo); 1115 INP_WLOCK(inp); 1116 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1117 in_pcbdisconnect(inp); 1118 inp->inp_laddr.s_addr = INADDR_ANY; 1119 soisdisconnected(so); 1120 } 1121 INP_WUNLOCK(inp); 1122 INP_INFO_WUNLOCK(&V_udbinfo); 1123 } 1124 1125 static int 1126 udp_attach(struct socket *so, int proto, struct thread *td) 1127 { 1128 INIT_VNET_INET(so->so_vnet); 1129 struct inpcb *inp; 1130 int error; 1131 1132 inp = sotoinpcb(so); 1133 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1134 error = soreserve(so, udp_sendspace, udp_recvspace); 1135 if (error) 1136 return (error); 1137 INP_INFO_WLOCK(&V_udbinfo); 1138 error = in_pcballoc(so, &V_udbinfo); 1139 if (error) { 1140 INP_INFO_WUNLOCK(&V_udbinfo); 1141 return (error); 1142 } 1143 1144 inp = (struct inpcb *)so->so_pcb; 1145 INP_INFO_WUNLOCK(&V_udbinfo); 1146 inp->inp_vflag |= INP_IPV4; 1147 inp->inp_ip_ttl = V_ip_defttl; 1148 /* 1149 * UDP does not have a per-protocol pcb (inp->inp_ppcb). 1150 * We use this pointer for kernel tunneling pointer. 1151 * If we ever need to have a protocol block we will 1152 * need to move this function pointer there. Null 1153 * in this pointer means "do the normal thing". 1154 */ 1155 inp->inp_ppcb = NULL; 1156 INP_WUNLOCK(inp); 1157 return (0); 1158 } 1159 1160 int 1161 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f) 1162 { 1163 struct inpcb *inp; 1164 1165 inp = (struct inpcb *)so->so_pcb; 1166 KASSERT(so->so_type == SOCK_DGRAM, ("udp_set_kernel_tunneling: !dgram")); 1167 KASSERT(so->so_pcb != NULL, ("udp_set_kernel_tunneling: NULL inp")); 1168 if (so->so_type != SOCK_DGRAM) { 1169 /* Not UDP socket... sorry! */ 1170 return (ENOTSUP); 1171 } 1172 if (inp == NULL) { 1173 /* NULL INP? */ 1174 return (EINVAL); 1175 } 1176 INP_WLOCK(inp); 1177 if (inp->inp_ppcb != NULL) { 1178 INP_WUNLOCK(inp); 1179 return (EBUSY); 1180 } 1181 inp->inp_ppcb = f; 1182 INP_WUNLOCK(inp); 1183 return (0); 1184 } 1185 1186 static int 1187 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1188 { 1189 INIT_VNET_INET(so->so_vnet); 1190 struct inpcb *inp; 1191 int error; 1192 1193 inp = sotoinpcb(so); 1194 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1195 INP_INFO_WLOCK(&V_udbinfo); 1196 INP_WLOCK(inp); 1197 error = in_pcbbind(inp, nam, td->td_ucred); 1198 INP_WUNLOCK(inp); 1199 INP_INFO_WUNLOCK(&V_udbinfo); 1200 return (error); 1201 } 1202 1203 static void 1204 udp_close(struct socket *so) 1205 { 1206 INIT_VNET_INET(so->so_vnet); 1207 struct inpcb *inp; 1208 1209 inp = sotoinpcb(so); 1210 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1211 INP_INFO_WLOCK(&V_udbinfo); 1212 INP_WLOCK(inp); 1213 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1214 in_pcbdisconnect(inp); 1215 inp->inp_laddr.s_addr = INADDR_ANY; 1216 soisdisconnected(so); 1217 } 1218 INP_WUNLOCK(inp); 1219 INP_INFO_WUNLOCK(&V_udbinfo); 1220 } 1221 1222 static int 1223 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1224 { 1225 INIT_VNET_INET(so->so_vnet); 1226 struct inpcb *inp; 1227 int error; 1228 struct sockaddr_in *sin; 1229 1230 inp = sotoinpcb(so); 1231 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1232 INP_INFO_WLOCK(&V_udbinfo); 1233 INP_WLOCK(inp); 1234 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1235 INP_WUNLOCK(inp); 1236 INP_INFO_WUNLOCK(&V_udbinfo); 1237 return (EISCONN); 1238 } 1239 sin = (struct sockaddr_in *)nam; 1240 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1241 if (error != 0) { 1242 INP_WUNLOCK(inp); 1243 INP_INFO_WUNLOCK(&V_udbinfo); 1244 return (error); 1245 } 1246 error = in_pcbconnect(inp, nam, td->td_ucred); 1247 if (error == 0) 1248 soisconnected(so); 1249 INP_WUNLOCK(inp); 1250 INP_INFO_WUNLOCK(&V_udbinfo); 1251 return (error); 1252 } 1253 1254 static void 1255 udp_detach(struct socket *so) 1256 { 1257 INIT_VNET_INET(so->so_vnet); 1258 struct inpcb *inp; 1259 1260 inp = sotoinpcb(so); 1261 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1262 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1263 ("udp_detach: not disconnected")); 1264 INP_INFO_WLOCK(&V_udbinfo); 1265 INP_WLOCK(inp); 1266 in_pcbdetach(inp); 1267 in_pcbfree(inp); 1268 INP_INFO_WUNLOCK(&V_udbinfo); 1269 } 1270 1271 static int 1272 udp_disconnect(struct socket *so) 1273 { 1274 INIT_VNET_INET(so->so_vnet); 1275 struct inpcb *inp; 1276 1277 inp = sotoinpcb(so); 1278 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1279 INP_INFO_WLOCK(&V_udbinfo); 1280 INP_WLOCK(inp); 1281 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1282 INP_WUNLOCK(inp); 1283 INP_INFO_WUNLOCK(&V_udbinfo); 1284 return (ENOTCONN); 1285 } 1286 1287 in_pcbdisconnect(inp); 1288 inp->inp_laddr.s_addr = INADDR_ANY; 1289 SOCK_LOCK(so); 1290 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1291 SOCK_UNLOCK(so); 1292 INP_WUNLOCK(inp); 1293 INP_INFO_WUNLOCK(&V_udbinfo); 1294 return (0); 1295 } 1296 1297 static int 1298 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1299 struct mbuf *control, struct thread *td) 1300 { 1301 struct inpcb *inp; 1302 1303 inp = sotoinpcb(so); 1304 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1305 return (udp_output(inp, m, addr, control, td)); 1306 } 1307 1308 int 1309 udp_shutdown(struct socket *so) 1310 { 1311 struct inpcb *inp; 1312 1313 inp = sotoinpcb(so); 1314 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1315 INP_WLOCK(inp); 1316 socantsendmore(so); 1317 INP_WUNLOCK(inp); 1318 return (0); 1319 } 1320 1321 struct pr_usrreqs udp_usrreqs = { 1322 .pru_abort = udp_abort, 1323 .pru_attach = udp_attach, 1324 .pru_bind = udp_bind, 1325 .pru_connect = udp_connect, 1326 .pru_control = in_control, 1327 .pru_detach = udp_detach, 1328 .pru_disconnect = udp_disconnect, 1329 .pru_peeraddr = in_getpeeraddr, 1330 .pru_send = udp_send, 1331 .pru_soreceive = soreceive_dgram, 1332 .pru_sosend = sosend_dgram, 1333 .pru_shutdown = udp_shutdown, 1334 .pru_sockaddr = in_getsockaddr, 1335 .pru_sosetlabel = in_pcbsosetlabel, 1336 .pru_close = udp_close, 1337 }; 1338