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 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * Copyright (c) 2014 Kevin Lo 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Robert N. M. Watson under 10 * contract to Juniper Networks, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 37 */ 38 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD: stable/11/sys/netinet/udp_usrreq.c 347156 2019-05-05 12:34:32Z tuexen $"); 41 42#include "opt_inet.h" 43#include "opt_inet6.h" 44#include "opt_ipsec.h" 45#include "opt_rss.h" 46 47#include <sys/param.h> 48#include <sys/domain.h> 49#include <sys/eventhandler.h> 50#include <sys/jail.h> 51#include <sys/kernel.h> 52#include <sys/lock.h> 53#include <sys/malloc.h> 54#include <sys/mbuf.h> 55#include <sys/priv.h> 56#include <sys/proc.h> 57#include <sys/protosw.h> 58#include <sys/sdt.h> 59#include <sys/signalvar.h> 60#include <sys/socket.h> 61#include <sys/socketvar.h> 62#include <sys/sx.h> 63#include <sys/sysctl.h> 64#include <sys/syslog.h> 65#include <sys/systm.h> 66 67#include <vm/uma.h> 68 69#include <net/if.h> 70#include <net/if_var.h> 71#include <net/route.h> 72#include <net/rss_config.h> 73 74#include <netinet/in.h> 75#include <netinet/in_kdtrace.h> 76#include <netinet/in_pcb.h> 77#include <netinet/in_systm.h> 78#include <netinet/in_var.h> 79#include <netinet/ip.h> 80#ifdef INET6 81#include <netinet/ip6.h> 82#endif 83#include <netinet/ip_icmp.h> 84#include <netinet/icmp_var.h> 85#include <netinet/ip_var.h> 86#include <netinet/ip_options.h> 87#ifdef INET6 88#include <netinet6/ip6_var.h> 89#endif 90#include <netinet/udp.h> 91#include <netinet/udp_var.h> 92#include <netinet/udplite.h> 93#include <netinet/in_rss.h> 94 95#include <netipsec/ipsec_support.h> 96 97#include <machine/in_cksum.h> 98 99#include <security/mac/mac_framework.h> 100 101/* 102 * UDP and UDP-Lite protocols implementation. 103 * Per RFC 768, August, 1980. 104 * Per RFC 3828, July, 2004. 105 */ 106 107/* 108 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums 109 * removes the only data integrity mechanism for packets and malformed 110 * packets that would otherwise be discarded due to bad checksums, and may 111 * cause problems (especially for NFS data blocks). 112 */ 113VNET_DEFINE(int, udp_cksum) = 1; 114SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW, 115 &VNET_NAME(udp_cksum), 0, "compute udp checksum"); 116 117int udp_log_in_vain = 0; 118SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 119 &udp_log_in_vain, 0, "Log all incoming UDP packets"); 120 121VNET_DEFINE(int, udp_blackhole) = 0; 122SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW, 123 &VNET_NAME(udp_blackhole), 0, 124 "Do not send port unreachables for refused connects"); 125 126u_long udp_sendspace = 9216; /* really max datagram size */ 127SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 128 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 129 130u_long udp_recvspace = 40 * (1024 + 131#ifdef INET6 132 sizeof(struct sockaddr_in6) 133#else 134 sizeof(struct sockaddr_in) 135#endif 136 ); /* 40 1K datagrams */ 137 138SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 139 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 140 141VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */ 142VNET_DEFINE(struct inpcbinfo, udbinfo); 143VNET_DEFINE(struct inpcbhead, ulitecb); 144VNET_DEFINE(struct inpcbinfo, ulitecbinfo); 145static VNET_DEFINE(uma_zone_t, udpcb_zone); 146#define V_udpcb_zone VNET(udpcb_zone) 147 148#ifndef UDBHASHSIZE 149#define UDBHASHSIZE 128 150#endif 151 152VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat); /* from udp_var.h */ 153VNET_PCPUSTAT_SYSINIT(udpstat); 154SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat, 155 udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); 156 157#ifdef VIMAGE 158VNET_PCPUSTAT_SYSUNINIT(udpstat); 159#endif /* VIMAGE */ 160#ifdef INET 161static void udp_detach(struct socket *so); 162static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 163 struct mbuf *, struct thread *); 164#endif 165 166static void 167udp_zone_change(void *tag) 168{ 169 170 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); 171 uma_zone_set_max(V_udpcb_zone, maxsockets); 172} 173 174static int 175udp_inpcb_init(void *mem, int size, int flags) 176{ 177 struct inpcb *inp; 178 179 inp = mem; 180 INP_LOCK_INIT(inp, "inp", "udpinp"); 181 return (0); 182} 183 184static int 185udplite_inpcb_init(void *mem, int size, int flags) 186{ 187 struct inpcb *inp; 188 189 inp = mem; 190 INP_LOCK_INIT(inp, "inp", "udpliteinp"); 191 return (0); 192} 193 194void 195udp_init(void) 196{ 197 198 /* 199 * For now default to 2-tuple UDP hashing - until the fragment 200 * reassembly code can also update the flowid. 201 * 202 * Once we can calculate the flowid that way and re-establish 203 * a 4-tuple, flip this to 4-tuple. 204 */ 205 in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE, 206 "udp_inpcb", udp_inpcb_init, NULL, 0, 207 IPI_HASHFIELDS_2TUPLE); 208 V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb), 209 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 210 uma_zone_set_max(V_udpcb_zone, maxsockets); 211 uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached"); 212 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 213 EVENTHANDLER_PRI_ANY); 214} 215 216void 217udplite_init(void) 218{ 219 220 in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE, 221 UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL, 222 0, IPI_HASHFIELDS_2TUPLE); 223} 224 225/* 226 * Kernel module interface for updating udpstat. The argument is an index 227 * into udpstat treated as an array of u_long. While this encodes the 228 * general layout of udpstat into the caller, it doesn't encode its location, 229 * so that future changes to add, for example, per-CPU stats support won't 230 * cause binary compatibility problems for kernel modules. 231 */ 232void 233kmod_udpstat_inc(int statnum) 234{ 235 236 counter_u64_add(VNET(udpstat)[statnum], 1); 237} 238 239int 240udp_newudpcb(struct inpcb *inp) 241{ 242 struct udpcb *up; 243 244 up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO); 245 if (up == NULL) 246 return (ENOBUFS); 247 inp->inp_ppcb = up; 248 return (0); 249} 250 251void 252udp_discardcb(struct udpcb *up) 253{ 254 255 uma_zfree(V_udpcb_zone, up); 256} 257 258#ifdef VIMAGE 259static void 260udp_destroy(void *unused __unused) 261{ 262 263 in_pcbinfo_destroy(&V_udbinfo); 264 uma_zdestroy(V_udpcb_zone); 265} 266VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL); 267 268static void 269udplite_destroy(void *unused __unused) 270{ 271 272 in_pcbinfo_destroy(&V_ulitecbinfo); 273} 274VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy, 275 NULL); 276#endif 277 278#ifdef INET 279/* 280 * Subroutine of udp_input(), which appends the provided mbuf chain to the 281 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 282 * contains the source address. If the socket ends up being an IPv6 socket, 283 * udp_append() will convert to a sockaddr_in6 before passing the address 284 * into the socket code. 285 * 286 * In the normal case udp_append() will return 0, indicating that you 287 * must unlock the inp. However if a tunneling protocol is in place we increment 288 * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we 289 * then decrement the reference count. If the inp_rele returns 1, indicating the 290 * inp is gone, we return that to the caller to tell them *not* to unlock 291 * the inp. In the case of multi-cast this will cause the distribution 292 * to stop (though most tunneling protocols known currently do *not* use 293 * multicast). 294 */ 295static int 296udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off, 297 struct sockaddr_in *udp_in) 298{ 299 struct sockaddr *append_sa; 300 struct socket *so; 301 struct mbuf *opts = NULL; 302#ifdef INET6 303 struct sockaddr_in6 udp_in6; 304#endif 305 struct udpcb *up; 306 307 INP_LOCK_ASSERT(inp); 308 309 /* 310 * Engage the tunneling protocol. 311 */ 312 up = intoudpcb(inp); 313 if (up->u_tun_func != NULL) { 314 in_pcbref(inp); 315 INP_RUNLOCK(inp); 316 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in, 317 up->u_tun_ctx); 318 INP_RLOCK(inp); 319 return (in_pcbrele_rlocked(inp)); 320 } 321 322 off += sizeof(struct udphdr); 323 324#if defined(IPSEC) || defined(IPSEC_SUPPORT) 325 /* Check AH/ESP integrity. */ 326 if (IPSEC_ENABLED(ipv4) && 327 IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) { 328 m_freem(n); 329 return (0); 330 } 331 if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */ 332 if (IPSEC_ENABLED(ipv4) && 333 UDPENCAP_INPUT(n, off, AF_INET) != 0) 334 return (0); /* Consumed. */ 335 } 336#endif /* IPSEC */ 337#ifdef MAC 338 if (mac_inpcb_check_deliver(inp, n) != 0) { 339 m_freem(n); 340 return (0); 341 } 342#endif /* MAC */ 343 if (inp->inp_flags & INP_CONTROLOPTS || 344 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 345#ifdef INET6 346 if (inp->inp_vflag & INP_IPV6) 347 (void)ip6_savecontrol_v4(inp, n, &opts, NULL); 348 else 349#endif /* INET6 */ 350 ip_savecontrol(inp, &opts, ip, n); 351 } 352#ifdef INET6 353 if (inp->inp_vflag & INP_IPV6) { 354 bzero(&udp_in6, sizeof(udp_in6)); 355 udp_in6.sin6_len = sizeof(udp_in6); 356 udp_in6.sin6_family = AF_INET6; 357 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 358 append_sa = (struct sockaddr *)&udp_in6; 359 } else 360#endif /* INET6 */ 361 append_sa = (struct sockaddr *)udp_in; 362 m_adj(n, off); 363 364 so = inp->inp_socket; 365 SOCKBUF_LOCK(&so->so_rcv); 366 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 367 SOCKBUF_UNLOCK(&so->so_rcv); 368 m_freem(n); 369 if (opts) 370 m_freem(opts); 371 UDPSTAT_INC(udps_fullsock); 372 } else 373 sorwakeup_locked(so); 374 return (0); 375} 376 377int 378udp_input(struct mbuf **mp, int *offp, int proto) 379{ 380 struct ip *ip; 381 struct udphdr *uh; 382 struct ifnet *ifp; 383 struct inpcb *inp; 384 uint16_t len, ip_len; 385 struct inpcbinfo *pcbinfo; 386 struct ip save_ip; 387 struct sockaddr_in udp_in; 388 struct mbuf *m; 389 struct m_tag *fwd_tag; 390 int cscov_partial, iphlen; 391 392 m = *mp; 393 iphlen = *offp; 394 ifp = m->m_pkthdr.rcvif; 395 *mp = NULL; 396 UDPSTAT_INC(udps_ipackets); 397 398 /* 399 * Strip IP options, if any; should skip this, make available to 400 * user, and use on returned packets, but we don't yet have a way to 401 * check the checksum with options still present. 402 */ 403 if (iphlen > sizeof (struct ip)) { 404 ip_stripoptions(m); 405 iphlen = sizeof(struct ip); 406 } 407 408 /* 409 * Get IP and UDP header together in first mbuf. 410 */ 411 ip = mtod(m, struct ip *); 412 if (m->m_len < iphlen + sizeof(struct udphdr)) { 413 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) { 414 UDPSTAT_INC(udps_hdrops); 415 return (IPPROTO_DONE); 416 } 417 ip = mtod(m, struct ip *); 418 } 419 uh = (struct udphdr *)((caddr_t)ip + iphlen); 420 cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0; 421 422 /* 423 * Destination port of 0 is illegal, based on RFC768. 424 */ 425 if (uh->uh_dport == 0) 426 goto badunlocked; 427 428 /* 429 * Construct sockaddr format source address. Stuff source address 430 * and datagram in user buffer. 431 */ 432 bzero(&udp_in, sizeof(udp_in)); 433 udp_in.sin_len = sizeof(udp_in); 434 udp_in.sin_family = AF_INET; 435 udp_in.sin_port = uh->uh_sport; 436 udp_in.sin_addr = ip->ip_src; 437 438 /* 439 * Make mbuf data length reflect UDP length. If not enough data to 440 * reflect UDP length, drop. 441 */ 442 len = ntohs((u_short)uh->uh_ulen); 443 ip_len = ntohs(ip->ip_len) - iphlen; 444 if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) { 445 /* Zero means checksum over the complete packet. */ 446 if (len == 0) 447 len = ip_len; 448 cscov_partial = 0; 449 } 450 if (ip_len != len) { 451 if (len > ip_len || len < sizeof(struct udphdr)) { 452 UDPSTAT_INC(udps_badlen); 453 goto badunlocked; 454 } 455 if (proto == IPPROTO_UDP) 456 m_adj(m, len - ip_len); 457 } 458 459 /* 460 * Save a copy of the IP header in case we want restore it for 461 * sending an ICMP error message in response. 462 */ 463 if (!V_udp_blackhole) 464 save_ip = *ip; 465 else 466 memset(&save_ip, 0, sizeof(save_ip)); 467 468 /* 469 * Checksum extended UDP header and data. 470 */ 471 if (uh->uh_sum) { 472 u_short uh_sum; 473 474 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) && 475 !cscov_partial) { 476 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 477 uh_sum = m->m_pkthdr.csum_data; 478 else 479 uh_sum = in_pseudo(ip->ip_src.s_addr, 480 ip->ip_dst.s_addr, htonl((u_short)len + 481 m->m_pkthdr.csum_data + proto)); 482 uh_sum ^= 0xffff; 483 } else { 484 char b[9]; 485 486 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 487 bzero(((struct ipovly *)ip)->ih_x1, 9); 488 ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ? 489 uh->uh_ulen : htons(ip_len); 490 uh_sum = in_cksum(m, len + sizeof (struct ip)); 491 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 492 } 493 if (uh_sum) { 494 UDPSTAT_INC(udps_badsum); 495 m_freem(m); 496 return (IPPROTO_DONE); 497 } 498 } else { 499 if (proto == IPPROTO_UDP) { 500 UDPSTAT_INC(udps_nosum); 501 } else { 502 /* UDPLite requires a checksum */ 503 /* XXX: What is the right UDPLite MIB counter here? */ 504 m_freem(m); 505 return (IPPROTO_DONE); 506 } 507 } 508 509 pcbinfo = udp_get_inpcbinfo(proto); 510 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 511 in_broadcast(ip->ip_dst, ifp)) { 512 struct inpcb *last; 513 struct inpcbhead *pcblist; 514 struct ip_moptions *imo; 515 516 INP_INFO_RLOCK(pcbinfo); 517 pcblist = udp_get_pcblist(proto); 518 last = NULL; 519 LIST_FOREACH(inp, pcblist, inp_list) { 520 if (inp->inp_lport != uh->uh_dport) 521 continue; 522#ifdef INET6 523 if ((inp->inp_vflag & INP_IPV4) == 0) 524 continue; 525#endif 526 if (inp->inp_laddr.s_addr != INADDR_ANY && 527 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 528 continue; 529 if (inp->inp_faddr.s_addr != INADDR_ANY && 530 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 531 continue; 532 if (inp->inp_fport != 0 && 533 inp->inp_fport != uh->uh_sport) 534 continue; 535 536 INP_RLOCK(inp); 537 538 /* 539 * XXXRW: Because we weren't holding either the inpcb 540 * or the hash lock when we checked for a match 541 * before, we should probably recheck now that the 542 * inpcb lock is held. 543 */ 544 545 /* 546 * Handle socket delivery policy for any-source 547 * and source-specific multicast. [RFC3678] 548 */ 549 imo = inp->inp_moptions; 550 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 551 struct sockaddr_in group; 552 int blocked; 553 if (imo == NULL) { 554 INP_RUNLOCK(inp); 555 continue; 556 } 557 bzero(&group, sizeof(struct sockaddr_in)); 558 group.sin_len = sizeof(struct sockaddr_in); 559 group.sin_family = AF_INET; 560 group.sin_addr = ip->ip_dst; 561 562 blocked = imo_multi_filter(imo, ifp, 563 (struct sockaddr *)&group, 564 (struct sockaddr *)&udp_in); 565 if (blocked != MCAST_PASS) { 566 if (blocked == MCAST_NOTGMEMBER) 567 IPSTAT_INC(ips_notmember); 568 if (blocked == MCAST_NOTSMEMBER || 569 blocked == MCAST_MUTED) 570 UDPSTAT_INC(udps_filtermcast); 571 INP_RUNLOCK(inp); 572 continue; 573 } 574 } 575 if (last != NULL) { 576 struct mbuf *n; 577 578 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { 579 UDP_PROBE(receive, NULL, last, ip, 580 last, uh); 581 if (udp_append(last, ip, n, iphlen, 582 &udp_in)) { 583 goto inp_lost; 584 } 585 } 586 INP_RUNLOCK(last); 587 } 588 last = inp; 589 /* 590 * Don't look for additional matches if this one does 591 * not have either the SO_REUSEPORT or SO_REUSEADDR 592 * socket options set. This heuristic avoids 593 * searching through all pcbs in the common case of a 594 * non-shared port. It assumes that an application 595 * will never clear these options after setting them. 596 */ 597 if ((last->inp_socket->so_options & 598 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 599 break; 600 } 601 602 if (last == NULL) { 603 /* 604 * No matching pcb found; discard datagram. (No need 605 * to send an ICMP Port Unreachable for a broadcast 606 * or multicast datgram.) 607 */ 608 UDPSTAT_INC(udps_noportbcast); 609 if (inp) 610 INP_RUNLOCK(inp); 611 INP_INFO_RUNLOCK(pcbinfo); 612 goto badunlocked; 613 } 614 UDP_PROBE(receive, NULL, last, ip, last, uh); 615 if (udp_append(last, ip, m, iphlen, &udp_in) == 0) 616 INP_RUNLOCK(last); 617 inp_lost: 618 INP_INFO_RUNLOCK(pcbinfo); 619 return (IPPROTO_DONE); 620 } 621 622 /* 623 * Locate pcb for datagram. 624 */ 625 626 /* 627 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 628 */ 629 if ((m->m_flags & M_IP_NEXTHOP) && 630 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 631 struct sockaddr_in *next_hop; 632 633 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 634 635 /* 636 * Transparently forwarded. Pretend to be the destination. 637 * Already got one like this? 638 */ 639 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport, 640 ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m); 641 if (!inp) { 642 /* 643 * It's new. Try to find the ambushing socket. 644 * Because we've rewritten the destination address, 645 * any hardware-generated hash is ignored. 646 */ 647 inp = in_pcblookup(pcbinfo, ip->ip_src, 648 uh->uh_sport, next_hop->sin_addr, 649 next_hop->sin_port ? htons(next_hop->sin_port) : 650 uh->uh_dport, INPLOOKUP_WILDCARD | 651 INPLOOKUP_RLOCKPCB, ifp); 652 } 653 /* Remove the tag from the packet. We don't need it anymore. */ 654 m_tag_delete(m, fwd_tag); 655 m->m_flags &= ~M_IP_NEXTHOP; 656 } else 657 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport, 658 ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD | 659 INPLOOKUP_RLOCKPCB, ifp, m); 660 if (inp == NULL) { 661 if (udp_log_in_vain) { 662 char src[INET_ADDRSTRLEN]; 663 char dst[INET_ADDRSTRLEN]; 664 665 log(LOG_INFO, 666 "Connection attempt to UDP %s:%d from %s:%d\n", 667 inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport), 668 inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport)); 669 } 670 UDP_PROBE(receive, NULL, NULL, ip, NULL, uh); 671 UDPSTAT_INC(udps_noport); 672 if (m->m_flags & (M_BCAST | M_MCAST)) { 673 UDPSTAT_INC(udps_noportbcast); 674 goto badunlocked; 675 } 676 if (V_udp_blackhole) 677 goto badunlocked; 678 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 679 goto badunlocked; 680 *ip = save_ip; 681 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 682 return (IPPROTO_DONE); 683 } 684 685 /* 686 * Check the minimum TTL for socket. 687 */ 688 INP_RLOCK_ASSERT(inp); 689 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 690 UDP_PROBE(receive, NULL, inp, ip, inp, uh); 691 INP_RUNLOCK(inp); 692 m_freem(m); 693 return (IPPROTO_DONE); 694 } 695 if (cscov_partial) { 696 struct udpcb *up; 697 698 up = intoudpcb(inp); 699 if (up->u_rxcslen == 0 || up->u_rxcslen > len) { 700 INP_RUNLOCK(inp); 701 m_freem(m); 702 return (IPPROTO_DONE); 703 } 704 } 705 706 UDP_PROBE(receive, NULL, inp, ip, inp, uh); 707 if (udp_append(inp, ip, m, iphlen, &udp_in) == 0) 708 INP_RUNLOCK(inp); 709 return (IPPROTO_DONE); 710 711badunlocked: 712 m_freem(m); 713 return (IPPROTO_DONE); 714} 715#endif /* INET */ 716 717/* 718 * Notify a udp user of an asynchronous error; just wake up so that they can 719 * collect error status. 720 */ 721struct inpcb * 722udp_notify(struct inpcb *inp, int errno) 723{ 724 725 /* 726 * While udp_ctlinput() always calls udp_notify() with a read lock 727 * when invoking it directly, in_pcbnotifyall() currently uses write 728 * locks due to sharing code with TCP. For now, accept either a read 729 * or a write lock, but a read lock is sufficient. 730 */ 731 INP_LOCK_ASSERT(inp); 732 if ((errno == EHOSTUNREACH || errno == ENETUNREACH || 733 errno == EHOSTDOWN) && inp->inp_route.ro_rt) { 734 RTFREE(inp->inp_route.ro_rt); 735 inp->inp_route.ro_rt = (struct rtentry *)NULL; 736 } 737 738 inp->inp_socket->so_error = errno; 739 sorwakeup(inp->inp_socket); 740 sowwakeup(inp->inp_socket); 741 return (inp); 742} 743 744#ifdef INET 745static void 746udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip, 747 struct inpcbinfo *pcbinfo) 748{ 749 struct ip *ip = vip; 750 struct udphdr *uh; 751 struct in_addr faddr; 752 struct inpcb *inp; 753 754 faddr = ((struct sockaddr_in *)sa)->sin_addr; 755 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 756 return; 757 758 if (PRC_IS_REDIRECT(cmd)) { 759 /* signal EHOSTDOWN, as it flushes the cached route */ 760 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify); 761 return; 762 } 763 764 /* 765 * Hostdead is ugly because it goes linearly through all PCBs. 766 * 767 * XXX: We never get this from ICMP, otherwise it makes an excellent 768 * DoS attack on machines with many connections. 769 */ 770 if (cmd == PRC_HOSTDEAD) 771 ip = NULL; 772 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 773 return; 774 if (ip != NULL) { 775 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 776 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport, 777 ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL); 778 if (inp != NULL) { 779 INP_RLOCK_ASSERT(inp); 780 if (inp->inp_socket != NULL) { 781 udp_notify(inp, inetctlerrmap[cmd]); 782 } 783 INP_RUNLOCK(inp); 784 } else { 785 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport, 786 ip->ip_src, uh->uh_sport, 787 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 788 if (inp != NULL) { 789 struct udpcb *up; 790 791 up = intoudpcb(inp); 792 if (up->u_icmp_func != NULL) { 793 INP_RUNLOCK(inp); 794 (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx); 795 } else { 796 INP_RUNLOCK(inp); 797 } 798 } 799 } 800 } else 801 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd], 802 udp_notify); 803} 804void 805udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 806{ 807 808 return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo)); 809} 810 811void 812udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip) 813{ 814 815 return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo)); 816} 817#endif /* INET */ 818 819static int 820udp_pcblist(SYSCTL_HANDLER_ARGS) 821{ 822 int error, i, n; 823 struct inpcb *inp, **inp_list; 824 inp_gen_t gencnt; 825 struct xinpgen xig; 826 827 /* 828 * The process of preparing the PCB list is too time-consuming and 829 * resource-intensive to repeat twice on every request. 830 */ 831 if (req->oldptr == 0) { 832 n = V_udbinfo.ipi_count; 833 n += imax(n / 8, 10); 834 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 835 return (0); 836 } 837 838 if (req->newptr != 0) 839 return (EPERM); 840 841 /* 842 * OK, now we're committed to doing something. 843 */ 844 INP_INFO_RLOCK(&V_udbinfo); 845 gencnt = V_udbinfo.ipi_gencnt; 846 n = V_udbinfo.ipi_count; 847 INP_INFO_RUNLOCK(&V_udbinfo); 848 849 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 850 + n * sizeof(struct xinpcb)); 851 if (error != 0) 852 return (error); 853 854 bzero(&xig, sizeof(xig)); 855 xig.xig_len = sizeof xig; 856 xig.xig_count = n; 857 xig.xig_gen = gencnt; 858 xig.xig_sogen = so_gencnt; 859 error = SYSCTL_OUT(req, &xig, sizeof xig); 860 if (error) 861 return (error); 862 863 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 864 if (inp_list == NULL) 865 return (ENOMEM); 866 867 INP_INFO_RLOCK(&V_udbinfo); 868 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; 869 inp = LIST_NEXT(inp, inp_list)) { 870 INP_WLOCK(inp); 871 if (inp->inp_gencnt <= gencnt && 872 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 873 in_pcbref(inp); 874 inp_list[i++] = inp; 875 } 876 INP_WUNLOCK(inp); 877 } 878 INP_INFO_RUNLOCK(&V_udbinfo); 879 n = i; 880 881 error = 0; 882 for (i = 0; i < n; i++) { 883 inp = inp_list[i]; 884 INP_RLOCK(inp); 885 if (inp->inp_gencnt <= gencnt) { 886 struct xinpcb xi; 887 888 bzero(&xi, sizeof(xi)); 889 xi.xi_len = sizeof xi; 890 /* XXX should avoid extra copy */ 891 bcopy(inp, &xi.xi_inp, sizeof *inp); 892 if (inp->inp_socket) 893 sotoxsocket(inp->inp_socket, &xi.xi_socket); 894 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 895 INP_RUNLOCK(inp); 896 error = SYSCTL_OUT(req, &xi, sizeof xi); 897 } else 898 INP_RUNLOCK(inp); 899 } 900 INP_INFO_WLOCK(&V_udbinfo); 901 for (i = 0; i < n; i++) { 902 inp = inp_list[i]; 903 INP_RLOCK(inp); 904 if (!in_pcbrele_rlocked(inp)) 905 INP_RUNLOCK(inp); 906 } 907 INP_INFO_WUNLOCK(&V_udbinfo); 908 909 if (!error) { 910 /* 911 * Give the user an updated idea of our state. If the 912 * generation differs from what we told her before, she knows 913 * that something happened while we were processing this 914 * request, and it might be necessary to retry. 915 */ 916 INP_INFO_RLOCK(&V_udbinfo); 917 xig.xig_gen = V_udbinfo.ipi_gencnt; 918 xig.xig_sogen = so_gencnt; 919 xig.xig_count = V_udbinfo.ipi_count; 920 INP_INFO_RUNLOCK(&V_udbinfo); 921 error = SYSCTL_OUT(req, &xig, sizeof xig); 922 } 923 free(inp_list, M_TEMP); 924 return (error); 925} 926 927SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, 928 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 929 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 930 931#ifdef INET 932static int 933udp_getcred(SYSCTL_HANDLER_ARGS) 934{ 935 struct xucred xuc; 936 struct sockaddr_in addrs[2]; 937 struct inpcb *inp; 938 int error; 939 940 error = priv_check(req->td, PRIV_NETINET_GETCRED); 941 if (error) 942 return (error); 943 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 944 if (error) 945 return (error); 946 inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 947 addrs[0].sin_addr, addrs[0].sin_port, 948 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 949 if (inp != NULL) { 950 INP_RLOCK_ASSERT(inp); 951 if (inp->inp_socket == NULL) 952 error = ENOENT; 953 if (error == 0) 954 error = cr_canseeinpcb(req->td->td_ucred, inp); 955 if (error == 0) 956 cru2x(inp->inp_cred, &xuc); 957 INP_RUNLOCK(inp); 958 } else 959 error = ENOENT; 960 if (error == 0) 961 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 962 return (error); 963} 964 965SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 966 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 967 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 968#endif /* INET */ 969 970int 971udp_ctloutput(struct socket *so, struct sockopt *sopt) 972{ 973 struct inpcb *inp; 974 struct udpcb *up; 975 int isudplite, error, optval; 976 977 error = 0; 978 isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0; 979 inp = sotoinpcb(so); 980 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 981 INP_WLOCK(inp); 982 if (sopt->sopt_level != so->so_proto->pr_protocol) { 983#ifdef INET6 984 if (INP_CHECK_SOCKAF(so, AF_INET6)) { 985 INP_WUNLOCK(inp); 986 error = ip6_ctloutput(so, sopt); 987 } 988#endif 989#if defined(INET) && defined(INET6) 990 else 991#endif 992#ifdef INET 993 { 994 INP_WUNLOCK(inp); 995 error = ip_ctloutput(so, sopt); 996 } 997#endif 998 return (error); 999 } 1000 1001 switch (sopt->sopt_dir) { 1002 case SOPT_SET: 1003 switch (sopt->sopt_name) { 1004#if defined(IPSEC) || defined(IPSEC_SUPPORT) 1005#ifdef INET 1006 case UDP_ENCAP: 1007 if (!IPSEC_ENABLED(ipv4)) { 1008 INP_WUNLOCK(inp); 1009 return (ENOPROTOOPT); 1010 } 1011 error = UDPENCAP_PCBCTL(inp, sopt); 1012 break; 1013#endif /* INET */ 1014#endif /* IPSEC */ 1015 case UDPLITE_SEND_CSCOV: 1016 case UDPLITE_RECV_CSCOV: 1017 if (!isudplite) { 1018 INP_WUNLOCK(inp); 1019 error = ENOPROTOOPT; 1020 break; 1021 } 1022 INP_WUNLOCK(inp); 1023 error = sooptcopyin(sopt, &optval, sizeof(optval), 1024 sizeof(optval)); 1025 if (error != 0) 1026 break; 1027 inp = sotoinpcb(so); 1028 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1029 INP_WLOCK(inp); 1030 up = intoudpcb(inp); 1031 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1032 if ((optval != 0 && optval < 8) || (optval > 65535)) { 1033 INP_WUNLOCK(inp); 1034 error = EINVAL; 1035 break; 1036 } 1037 if (sopt->sopt_name == UDPLITE_SEND_CSCOV) 1038 up->u_txcslen = optval; 1039 else 1040 up->u_rxcslen = optval; 1041 INP_WUNLOCK(inp); 1042 break; 1043 default: 1044 INP_WUNLOCK(inp); 1045 error = ENOPROTOOPT; 1046 break; 1047 } 1048 break; 1049 case SOPT_GET: 1050 switch (sopt->sopt_name) { 1051#if defined(IPSEC) || defined(IPSEC_SUPPORT) 1052#ifdef INET 1053 case UDP_ENCAP: 1054 if (!IPSEC_ENABLED(ipv4)) { 1055 INP_WUNLOCK(inp); 1056 return (ENOPROTOOPT); 1057 } 1058 error = UDPENCAP_PCBCTL(inp, sopt); 1059 break; 1060#endif /* INET */ 1061#endif /* IPSEC */ 1062 case UDPLITE_SEND_CSCOV: 1063 case UDPLITE_RECV_CSCOV: 1064 if (!isudplite) { 1065 INP_WUNLOCK(inp); 1066 error = ENOPROTOOPT; 1067 break; 1068 } 1069 up = intoudpcb(inp); 1070 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1071 if (sopt->sopt_name == UDPLITE_SEND_CSCOV) 1072 optval = up->u_txcslen; 1073 else 1074 optval = up->u_rxcslen; 1075 INP_WUNLOCK(inp); 1076 error = sooptcopyout(sopt, &optval, sizeof(optval)); 1077 break; 1078 default: 1079 INP_WUNLOCK(inp); 1080 error = ENOPROTOOPT; 1081 break; 1082 } 1083 break; 1084 } 1085 return (error); 1086} 1087 1088#ifdef INET 1089#define UH_WLOCKED 2 1090#define UH_RLOCKED 1 1091#define UH_UNLOCKED 0 1092static int 1093udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 1094 struct mbuf *control, struct thread *td) 1095{ 1096 struct udpiphdr *ui; 1097 int len = m->m_pkthdr.len; 1098 struct in_addr faddr, laddr; 1099 struct cmsghdr *cm; 1100 struct inpcbinfo *pcbinfo; 1101 struct sockaddr_in *sin, src; 1102 int cscov_partial = 0; 1103 int error = 0; 1104 int ipflags; 1105 u_short fport, lport; 1106 int unlock_udbinfo, unlock_inp; 1107 u_char tos; 1108 uint8_t pr; 1109 uint16_t cscov = 0; 1110 uint32_t flowid = 0; 1111 uint8_t flowtype = M_HASHTYPE_NONE; 1112 1113 /* 1114 * udp_output() may need to temporarily bind or connect the current 1115 * inpcb. As such, we don't know up front whether we will need the 1116 * pcbinfo lock or not. Do any work to decide what is needed up 1117 * front before acquiring any locks. 1118 */ 1119 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1120 if (control) 1121 m_freem(control); 1122 m_freem(m); 1123 return (EMSGSIZE); 1124 } 1125 1126 src.sin_family = 0; 1127 sin = (struct sockaddr_in *)addr; 1128 if (sin == NULL || 1129 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 1130 INP_WLOCK(inp); 1131 unlock_inp = UH_WLOCKED; 1132 } else { 1133 INP_RLOCK(inp); 1134 unlock_inp = UH_RLOCKED; 1135 } 1136 tos = inp->inp_ip_tos; 1137 if (control != NULL) { 1138 /* 1139 * XXX: Currently, we assume all the optional information is 1140 * stored in a single mbuf. 1141 */ 1142 if (control->m_next) { 1143 if (unlock_inp == UH_WLOCKED) 1144 INP_WUNLOCK(inp); 1145 else 1146 INP_RUNLOCK(inp); 1147 m_freem(control); 1148 m_freem(m); 1149 return (EINVAL); 1150 } 1151 for (; control->m_len > 0; 1152 control->m_data += CMSG_ALIGN(cm->cmsg_len), 1153 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1154 cm = mtod(control, struct cmsghdr *); 1155 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 1156 || cm->cmsg_len > control->m_len) { 1157 error = EINVAL; 1158 break; 1159 } 1160 if (cm->cmsg_level != IPPROTO_IP) 1161 continue; 1162 1163 switch (cm->cmsg_type) { 1164 case IP_SENDSRCADDR: 1165 if (cm->cmsg_len != 1166 CMSG_LEN(sizeof(struct in_addr))) { 1167 error = EINVAL; 1168 break; 1169 } 1170 bzero(&src, sizeof(src)); 1171 src.sin_family = AF_INET; 1172 src.sin_len = sizeof(src); 1173 src.sin_port = inp->inp_lport; 1174 src.sin_addr = 1175 *(struct in_addr *)CMSG_DATA(cm); 1176 break; 1177 1178 case IP_TOS: 1179 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) { 1180 error = EINVAL; 1181 break; 1182 } 1183 tos = *(u_char *)CMSG_DATA(cm); 1184 break; 1185 1186 case IP_FLOWID: 1187 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) { 1188 error = EINVAL; 1189 break; 1190 } 1191 flowid = *(uint32_t *) CMSG_DATA(cm); 1192 break; 1193 1194 case IP_FLOWTYPE: 1195 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) { 1196 error = EINVAL; 1197 break; 1198 } 1199 flowtype = *(uint32_t *) CMSG_DATA(cm); 1200 break; 1201 1202#ifdef RSS 1203 case IP_RSSBUCKETID: 1204 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) { 1205 error = EINVAL; 1206 break; 1207 } 1208 /* This is just a placeholder for now */ 1209 break; 1210#endif /* RSS */ 1211 default: 1212 error = ENOPROTOOPT; 1213 break; 1214 } 1215 if (error) 1216 break; 1217 } 1218 m_freem(control); 1219 } 1220 if (error) { 1221 if (unlock_inp == UH_WLOCKED) 1222 INP_WUNLOCK(inp); 1223 else 1224 INP_RUNLOCK(inp); 1225 m_freem(m); 1226 return (error); 1227 } 1228 1229 /* 1230 * Depending on whether or not the application has bound or connected 1231 * the socket, we may have to do varying levels of work. The optimal 1232 * case is for a connected UDP socket, as a global lock isn't 1233 * required at all. 1234 * 1235 * In order to decide which we need, we require stability of the 1236 * inpcb binding, which we ensure by acquiring a read lock on the 1237 * inpcb. This doesn't strictly follow the lock order, so we play 1238 * the trylock and retry game; note that we may end up with more 1239 * conservative locks than required the second time around, so later 1240 * assertions have to accept that. Further analysis of the number of 1241 * misses under contention is required. 1242 * 1243 * XXXRW: Check that hash locking update here is correct. 1244 */ 1245 pr = inp->inp_socket->so_proto->pr_protocol; 1246 pcbinfo = udp_get_inpcbinfo(pr); 1247 sin = (struct sockaddr_in *)addr; 1248 if (sin != NULL && 1249 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 1250 INP_HASH_WLOCK(pcbinfo); 1251 unlock_udbinfo = UH_WLOCKED; 1252 } else if ((sin != NULL && ( 1253 (sin->sin_addr.s_addr == INADDR_ANY) || 1254 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 1255 (inp->inp_laddr.s_addr == INADDR_ANY) || 1256 (inp->inp_lport == 0))) || 1257 (src.sin_family == AF_INET)) { 1258 INP_HASH_RLOCK(pcbinfo); 1259 unlock_udbinfo = UH_RLOCKED; 1260 } else 1261 unlock_udbinfo = UH_UNLOCKED; 1262 1263 /* 1264 * If the IP_SENDSRCADDR control message was specified, override the 1265 * source address for this datagram. Its use is invalidated if the 1266 * address thus specified is incomplete or clobbers other inpcbs. 1267 */ 1268 laddr = inp->inp_laddr; 1269 lport = inp->inp_lport; 1270 if (src.sin_family == AF_INET) { 1271 INP_HASH_LOCK_ASSERT(pcbinfo); 1272 if ((lport == 0) || 1273 (laddr.s_addr == INADDR_ANY && 1274 src.sin_addr.s_addr == INADDR_ANY)) { 1275 error = EINVAL; 1276 goto release; 1277 } 1278 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 1279 &laddr.s_addr, &lport, td->td_ucred); 1280 if (error) 1281 goto release; 1282 } 1283 1284 /* 1285 * If a UDP socket has been connected, then a local address/port will 1286 * have been selected and bound. 1287 * 1288 * If a UDP socket has not been connected to, then an explicit 1289 * destination address must be used, in which case a local 1290 * address/port may not have been selected and bound. 1291 */ 1292 if (sin != NULL) { 1293 INP_LOCK_ASSERT(inp); 1294 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1295 error = EISCONN; 1296 goto release; 1297 } 1298 1299 /* 1300 * Jail may rewrite the destination address, so let it do 1301 * that before we use it. 1302 */ 1303 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1304 if (error) 1305 goto release; 1306 1307 /* 1308 * If a local address or port hasn't yet been selected, or if 1309 * the destination address needs to be rewritten due to using 1310 * a special INADDR_ constant, invoke in_pcbconnect_setup() 1311 * to do the heavy lifting. Once a port is selected, we 1312 * commit the binding back to the socket; we also commit the 1313 * binding of the address if in jail. 1314 * 1315 * If we already have a valid binding and we're not 1316 * requesting a destination address rewrite, use a fast path. 1317 */ 1318 if (inp->inp_laddr.s_addr == INADDR_ANY || 1319 inp->inp_lport == 0 || 1320 sin->sin_addr.s_addr == INADDR_ANY || 1321 sin->sin_addr.s_addr == INADDR_BROADCAST) { 1322 INP_HASH_LOCK_ASSERT(pcbinfo); 1323 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 1324 &lport, &faddr.s_addr, &fport, NULL, 1325 td->td_ucred); 1326 if (error) 1327 goto release; 1328 1329 /* 1330 * XXXRW: Why not commit the port if the address is 1331 * !INADDR_ANY? 1332 */ 1333 /* Commit the local port if newly assigned. */ 1334 if (inp->inp_laddr.s_addr == INADDR_ANY && 1335 inp->inp_lport == 0) { 1336 INP_WLOCK_ASSERT(inp); 1337 INP_HASH_WLOCK_ASSERT(pcbinfo); 1338 /* 1339 * Remember addr if jailed, to prevent 1340 * rebinding. 1341 */ 1342 if (prison_flag(td->td_ucred, PR_IP4)) 1343 inp->inp_laddr = laddr; 1344 inp->inp_lport = lport; 1345 if (in_pcbinshash(inp) != 0) { 1346 inp->inp_lport = 0; 1347 error = EAGAIN; 1348 goto release; 1349 } 1350 inp->inp_flags |= INP_ANONPORT; 1351 } 1352 } else { 1353 faddr = sin->sin_addr; 1354 fport = sin->sin_port; 1355 } 1356 } else { 1357 INP_LOCK_ASSERT(inp); 1358 faddr = inp->inp_faddr; 1359 fport = inp->inp_fport; 1360 if (faddr.s_addr == INADDR_ANY) { 1361 error = ENOTCONN; 1362 goto release; 1363 } 1364 } 1365 1366 /* 1367 * Calculate data length and get a mbuf for UDP, IP, and possible 1368 * link-layer headers. Immediate slide the data pointer back forward 1369 * since we won't use that space at this layer. 1370 */ 1371 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT); 1372 if (m == NULL) { 1373 error = ENOBUFS; 1374 goto release; 1375 } 1376 m->m_data += max_linkhdr; 1377 m->m_len -= max_linkhdr; 1378 m->m_pkthdr.len -= max_linkhdr; 1379 1380 /* 1381 * Fill in mbuf with extended UDP header and addresses and length put 1382 * into network format. 1383 */ 1384 ui = mtod(m, struct udpiphdr *); 1385 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1386 ui->ui_v = IPVERSION << 4; 1387 ui->ui_pr = pr; 1388 ui->ui_src = laddr; 1389 ui->ui_dst = faddr; 1390 ui->ui_sport = lport; 1391 ui->ui_dport = fport; 1392 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1393 if (pr == IPPROTO_UDPLITE) { 1394 struct udpcb *up; 1395 uint16_t plen; 1396 1397 up = intoudpcb(inp); 1398 cscov = up->u_txcslen; 1399 plen = (u_short)len + sizeof(struct udphdr); 1400 if (cscov >= plen) 1401 cscov = 0; 1402 ui->ui_len = htons(plen); 1403 ui->ui_ulen = htons(cscov); 1404 /* 1405 * For UDP-Lite, checksum coverage length of zero means 1406 * the entire UDPLite packet is covered by the checksum. 1407 */ 1408 cscov_partial = (cscov == 0) ? 0 : 1; 1409 } 1410 1411 /* 1412 * Set the Don't Fragment bit in the IP header. 1413 */ 1414 if (inp->inp_flags & INP_DONTFRAG) { 1415 struct ip *ip; 1416 1417 ip = (struct ip *)&ui->ui_i; 1418 ip->ip_off |= htons(IP_DF); 1419 } 1420 1421 ipflags = 0; 1422 if (inp->inp_socket->so_options & SO_DONTROUTE) 1423 ipflags |= IP_ROUTETOIF; 1424 if (inp->inp_socket->so_options & SO_BROADCAST) 1425 ipflags |= IP_ALLOWBROADCAST; 1426 if (inp->inp_flags & INP_ONESBCAST) 1427 ipflags |= IP_SENDONES; 1428 1429#ifdef MAC 1430 mac_inpcb_create_mbuf(inp, m); 1431#endif 1432 1433 /* 1434 * Set up checksum and output datagram. 1435 */ 1436 ui->ui_sum = 0; 1437 if (pr == IPPROTO_UDPLITE) { 1438 if (inp->inp_flags & INP_ONESBCAST) 1439 faddr.s_addr = INADDR_BROADCAST; 1440 if (cscov_partial) { 1441 if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0) 1442 ui->ui_sum = 0xffff; 1443 } else { 1444 if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0) 1445 ui->ui_sum = 0xffff; 1446 } 1447 } else if (V_udp_cksum) { 1448 if (inp->inp_flags & INP_ONESBCAST) 1449 faddr.s_addr = INADDR_BROADCAST; 1450 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1451 htons((u_short)len + sizeof(struct udphdr) + pr)); 1452 m->m_pkthdr.csum_flags = CSUM_UDP; 1453 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1454 } 1455 ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len); 1456 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1457 ((struct ip *)ui)->ip_tos = tos; /* XXX */ 1458 UDPSTAT_INC(udps_opackets); 1459 1460 /* 1461 * Setup flowid / RSS information for outbound socket. 1462 * 1463 * Once the UDP code decides to set a flowid some other way, 1464 * this allows the flowid to be overridden by userland. 1465 */ 1466 if (flowtype != M_HASHTYPE_NONE) { 1467 m->m_pkthdr.flowid = flowid; 1468 M_HASHTYPE_SET(m, flowtype); 1469#ifdef RSS 1470 } else { 1471 uint32_t hash_val, hash_type; 1472 /* 1473 * Calculate an appropriate RSS hash for UDP and 1474 * UDP Lite. 1475 * 1476 * The called function will take care of figuring out 1477 * whether a 2-tuple or 4-tuple hash is required based 1478 * on the currently configured scheme. 1479 * 1480 * Later later on connected socket values should be 1481 * cached in the inpcb and reused, rather than constantly 1482 * re-calculating it. 1483 * 1484 * UDP Lite is a different protocol number and will 1485 * likely end up being hashed as a 2-tuple until 1486 * RSS / NICs grow UDP Lite protocol awareness. 1487 */ 1488 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport, 1489 pr, &hash_val, &hash_type) == 0) { 1490 m->m_pkthdr.flowid = hash_val; 1491 M_HASHTYPE_SET(m, hash_type); 1492 } 1493#endif 1494 } 1495 1496#ifdef RSS 1497 /* 1498 * Don't override with the inp cached flowid value. 1499 * 1500 * Depending upon the kind of send being done, the inp 1501 * flowid/flowtype values may actually not be appropriate 1502 * for this particular socket send. 1503 * 1504 * We should either leave the flowid at zero (which is what is 1505 * currently done) or set it to some software generated 1506 * hash value based on the packet contents. 1507 */ 1508 ipflags |= IP_NODEFAULTFLOWID; 1509#endif /* RSS */ 1510 1511 if (unlock_udbinfo == UH_WLOCKED) 1512 INP_HASH_WUNLOCK(pcbinfo); 1513 else if (unlock_udbinfo == UH_RLOCKED) 1514 INP_HASH_RUNLOCK(pcbinfo); 1515 UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u); 1516 error = ip_output(m, inp->inp_options, 1517 (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags, 1518 inp->inp_moptions, inp); 1519 if (unlock_inp == UH_WLOCKED) 1520 INP_WUNLOCK(inp); 1521 else 1522 INP_RUNLOCK(inp); 1523 return (error); 1524 1525release: 1526 if (unlock_udbinfo == UH_WLOCKED) { 1527 KASSERT(unlock_inp == UH_WLOCKED, 1528 ("%s: excl udbinfo lock, shared inp lock", __func__)); 1529 INP_HASH_WUNLOCK(pcbinfo); 1530 INP_WUNLOCK(inp); 1531 } else if (unlock_udbinfo == UH_RLOCKED) { 1532 KASSERT(unlock_inp == UH_RLOCKED, 1533 ("%s: shared udbinfo lock, excl inp lock", __func__)); 1534 INP_HASH_RUNLOCK(pcbinfo); 1535 INP_RUNLOCK(inp); 1536 } else if (unlock_inp == UH_WLOCKED) 1537 INP_WUNLOCK(inp); 1538 else 1539 INP_RUNLOCK(inp); 1540 m_freem(m); 1541 return (error); 1542} 1543 1544static void 1545udp_abort(struct socket *so) 1546{ 1547 struct inpcb *inp; 1548 struct inpcbinfo *pcbinfo; 1549 1550 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1551 inp = sotoinpcb(so); 1552 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1553 INP_WLOCK(inp); 1554 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1555 INP_HASH_WLOCK(pcbinfo); 1556 in_pcbdisconnect(inp); 1557 inp->inp_laddr.s_addr = INADDR_ANY; 1558 INP_HASH_WUNLOCK(pcbinfo); 1559 soisdisconnected(so); 1560 } 1561 INP_WUNLOCK(inp); 1562} 1563 1564static int 1565udp_attach(struct socket *so, int proto, struct thread *td) 1566{ 1567 struct inpcb *inp; 1568 struct inpcbinfo *pcbinfo; 1569 int error; 1570 1571 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1572 inp = sotoinpcb(so); 1573 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1574 error = soreserve(so, udp_sendspace, udp_recvspace); 1575 if (error) 1576 return (error); 1577 INP_INFO_WLOCK(pcbinfo); 1578 error = in_pcballoc(so, pcbinfo); 1579 if (error) { 1580 INP_INFO_WUNLOCK(pcbinfo); 1581 return (error); 1582 } 1583 1584 inp = sotoinpcb(so); 1585 inp->inp_vflag |= INP_IPV4; 1586 inp->inp_ip_ttl = V_ip_defttl; 1587 1588 error = udp_newudpcb(inp); 1589 if (error) { 1590 in_pcbdetach(inp); 1591 in_pcbfree(inp); 1592 INP_INFO_WUNLOCK(pcbinfo); 1593 return (error); 1594 } 1595 1596 INP_WUNLOCK(inp); 1597 INP_INFO_WUNLOCK(pcbinfo); 1598 return (0); 1599} 1600#endif /* INET */ 1601 1602int 1603udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx) 1604{ 1605 struct inpcb *inp; 1606 struct udpcb *up; 1607 1608 KASSERT(so->so_type == SOCK_DGRAM, 1609 ("udp_set_kernel_tunneling: !dgram")); 1610 inp = sotoinpcb(so); 1611 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL")); 1612 INP_WLOCK(inp); 1613 up = intoudpcb(inp); 1614 if ((up->u_tun_func != NULL) || 1615 (up->u_icmp_func != NULL)) { 1616 INP_WUNLOCK(inp); 1617 return (EBUSY); 1618 } 1619 up->u_tun_func = f; 1620 up->u_icmp_func = i; 1621 up->u_tun_ctx = ctx; 1622 INP_WUNLOCK(inp); 1623 return (0); 1624} 1625 1626#ifdef INET 1627static int 1628udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1629{ 1630 struct inpcb *inp; 1631 struct inpcbinfo *pcbinfo; 1632 int error; 1633 1634 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1635 inp = sotoinpcb(so); 1636 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1637 INP_WLOCK(inp); 1638 INP_HASH_WLOCK(pcbinfo); 1639 error = in_pcbbind(inp, nam, td->td_ucred); 1640 INP_HASH_WUNLOCK(pcbinfo); 1641 INP_WUNLOCK(inp); 1642 return (error); 1643} 1644 1645static void 1646udp_close(struct socket *so) 1647{ 1648 struct inpcb *inp; 1649 struct inpcbinfo *pcbinfo; 1650 1651 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1652 inp = sotoinpcb(so); 1653 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1654 INP_WLOCK(inp); 1655 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1656 INP_HASH_WLOCK(pcbinfo); 1657 in_pcbdisconnect(inp); 1658 inp->inp_laddr.s_addr = INADDR_ANY; 1659 INP_HASH_WUNLOCK(pcbinfo); 1660 soisdisconnected(so); 1661 } 1662 INP_WUNLOCK(inp); 1663} 1664 1665static int 1666udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1667{ 1668 struct inpcb *inp; 1669 struct inpcbinfo *pcbinfo; 1670 struct sockaddr_in *sin; 1671 int error; 1672 1673 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1674 inp = sotoinpcb(so); 1675 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1676 INP_WLOCK(inp); 1677 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1678 INP_WUNLOCK(inp); 1679 return (EISCONN); 1680 } 1681 sin = (struct sockaddr_in *)nam; 1682 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1683 if (error != 0) { 1684 INP_WUNLOCK(inp); 1685 return (error); 1686 } 1687 INP_HASH_WLOCK(pcbinfo); 1688 error = in_pcbconnect(inp, nam, td->td_ucred); 1689 INP_HASH_WUNLOCK(pcbinfo); 1690 if (error == 0) 1691 soisconnected(so); 1692 INP_WUNLOCK(inp); 1693 return (error); 1694} 1695 1696static void 1697udp_detach(struct socket *so) 1698{ 1699 struct inpcb *inp; 1700 struct inpcbinfo *pcbinfo; 1701 struct udpcb *up; 1702 1703 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1704 inp = sotoinpcb(so); 1705 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1706 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1707 ("udp_detach: not disconnected")); 1708 INP_INFO_WLOCK(pcbinfo); 1709 INP_WLOCK(inp); 1710 up = intoudpcb(inp); 1711 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1712 inp->inp_ppcb = NULL; 1713 in_pcbdetach(inp); 1714 in_pcbfree(inp); 1715 INP_INFO_WUNLOCK(pcbinfo); 1716 udp_discardcb(up); 1717} 1718 1719static int 1720udp_disconnect(struct socket *so) 1721{ 1722 struct inpcb *inp; 1723 struct inpcbinfo *pcbinfo; 1724 1725 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol); 1726 inp = sotoinpcb(so); 1727 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1728 INP_WLOCK(inp); 1729 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1730 INP_WUNLOCK(inp); 1731 return (ENOTCONN); 1732 } 1733 INP_HASH_WLOCK(pcbinfo); 1734 in_pcbdisconnect(inp); 1735 inp->inp_laddr.s_addr = INADDR_ANY; 1736 INP_HASH_WUNLOCK(pcbinfo); 1737 SOCK_LOCK(so); 1738 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1739 SOCK_UNLOCK(so); 1740 INP_WUNLOCK(inp); 1741 return (0); 1742} 1743 1744static int 1745udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1746 struct mbuf *control, struct thread *td) 1747{ 1748 struct inpcb *inp; 1749 1750 inp = sotoinpcb(so); 1751 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1752 return (udp_output(inp, m, addr, control, td)); 1753} 1754#endif /* INET */ 1755 1756int 1757udp_shutdown(struct socket *so) 1758{ 1759 struct inpcb *inp; 1760 1761 inp = sotoinpcb(so); 1762 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1763 INP_WLOCK(inp); 1764 socantsendmore(so); 1765 INP_WUNLOCK(inp); 1766 return (0); 1767} 1768 1769#ifdef INET 1770struct pr_usrreqs udp_usrreqs = { 1771 .pru_abort = udp_abort, 1772 .pru_attach = udp_attach, 1773 .pru_bind = udp_bind, 1774 .pru_connect = udp_connect, 1775 .pru_control = in_control, 1776 .pru_detach = udp_detach, 1777 .pru_disconnect = udp_disconnect, 1778 .pru_peeraddr = in_getpeeraddr, 1779 .pru_send = udp_send, 1780 .pru_soreceive = soreceive_dgram, 1781 .pru_sosend = sosend_dgram, 1782 .pru_shutdown = udp_shutdown, 1783 .pru_sockaddr = in_getsockaddr, 1784 .pru_sosetlabel = in_pcbsosetlabel, 1785 .pru_close = udp_close, 1786}; 1787#endif /* INET */ 1788