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 * All rights reserved. 7 * 8 * Portions of this software were developed by Robert N. M. Watson under 9 * contract to Juniper Networks, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD$"); 40 41#include "opt_ipfw.h" 42#include "opt_inet.h" 43#include "opt_inet6.h" 44#include "opt_ipsec.h" 45 46#include <sys/param.h> 47#include <sys/domain.h> 48#include <sys/eventhandler.h> 49#include <sys/jail.h> 50#include <sys/kernel.h> 51#include <sys/lock.h> 52#include <sys/malloc.h> 53#include <sys/mbuf.h> 54#include <sys/priv.h> 55#include <sys/proc.h> 56#include <sys/protosw.h> 57#include <sys/signalvar.h> 58#include <sys/socket.h> 59#include <sys/socketvar.h> 60#include <sys/sx.h> 61#include <sys/sysctl.h> 62#include <sys/syslog.h> 63#include <sys/systm.h> 64 65#include <vm/uma.h> 66 67#include <net/if.h> 68#include <net/route.h> 69 70#include <netinet/in.h> 71#include <netinet/in_pcb.h> 72#include <netinet/in_systm.h> 73#include <netinet/in_var.h> 74#include <netinet/ip.h> 75#ifdef INET6 76#include <netinet/ip6.h> 77#endif 78#include <netinet/ip_icmp.h> 79#include <netinet/icmp_var.h> 80#include <netinet/ip_var.h> 81#include <netinet/ip_options.h> 82#ifdef INET6 83#include <netinet6/ip6_var.h> 84#endif 85#include <netinet/udp.h> 86#include <netinet/udp_var.h> 87 88#ifdef IPSEC 89#include <netipsec/ipsec.h> 90#include <netipsec/esp.h> 91#endif 92 93#include <machine/in_cksum.h> 94 95#include <security/mac/mac_framework.h> 96 97/* 98 * UDP protocol implementation. 99 * Per RFC 768, August, 1980. 100 */ 101 102/* 103 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums 104 * removes the only data integrity mechanism for packets and malformed 105 * packets that would otherwise be discarded due to bad checksums, and may 106 * cause problems (especially for NFS data blocks). 107 */ 108VNET_DEFINE(int, udp_cksum) = 1; 109SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 110 &VNET_NAME(udp_cksum), 0, "compute udp checksum"); 111 112int udp_log_in_vain = 0; 113SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 114 &udp_log_in_vain, 0, "Log all incoming UDP packets"); 115 116VNET_DEFINE(int, udp_blackhole) = 0; 117SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 118 &VNET_NAME(udp_blackhole), 0, 119 "Do not send port unreachables for refused connects"); 120 121u_long udp_sendspace = 9216; /* really max datagram size */ 122 /* 40 1K datagrams */ 123SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 124 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 125 126u_long udp_recvspace = 40 * (1024 + 127#ifdef INET6 128 sizeof(struct sockaddr_in6) 129#else 130 sizeof(struct sockaddr_in) 131#endif 132 ); 133 134SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 135 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 136 137VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */ 138VNET_DEFINE(struct inpcbinfo, udbinfo); 139static VNET_DEFINE(uma_zone_t, udpcb_zone); 140#define V_udpcb_zone VNET(udpcb_zone) 141 142#ifndef UDBHASHSIZE 143#define UDBHASHSIZE 128 144#endif 145 146VNET_DEFINE(struct udpstat, udpstat); /* from udp_var.h */ 147SYSCTL_VNET_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 148 &VNET_NAME(udpstat), udpstat, 149 "UDP statistics (struct udpstat, netinet/udp_var.h)"); 150 151#ifdef INET 152static void udp_detach(struct socket *so); 153static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 154 struct mbuf *, struct thread *); 155#endif 156 157#ifdef IPSEC 158#ifdef IPSEC_NAT_T 159#define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP) 160#ifdef INET 161static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int); 162#endif 163#endif /* IPSEC_NAT_T */ 164#endif /* IPSEC */ 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 184void 185udp_init(void) 186{ 187 188 in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE, 189 "udp_inpcb", udp_inpcb_init, NULL, UMA_ZONE_NOFREE, 190 IPI_HASHFIELDS_2TUPLE); 191 V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb), 192 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 193 uma_zone_set_max(V_udpcb_zone, maxsockets); 194 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 195 EVENTHANDLER_PRI_ANY); 196} 197 198/* 199 * Kernel module interface for updating udpstat. The argument is an index 200 * into udpstat treated as an array of u_long. While this encodes the 201 * general layout of udpstat into the caller, it doesn't encode its location, 202 * so that future changes to add, for example, per-CPU stats support won't 203 * cause binary compatibility problems for kernel modules. 204 */ 205void 206kmod_udpstat_inc(int statnum) 207{ 208 209 (*((u_long *)&V_udpstat + statnum))++; 210} 211 212int 213udp_newudpcb(struct inpcb *inp) 214{ 215 struct udpcb *up; 216 217 up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO); 218 if (up == NULL) 219 return (ENOBUFS); 220 inp->inp_ppcb = up; 221 return (0); 222} 223 224void 225udp_discardcb(struct udpcb *up) 226{ 227 228 uma_zfree(V_udpcb_zone, up); 229} 230 231#ifdef VIMAGE 232void 233udp_destroy(void) 234{ 235 236 in_pcbinfo_destroy(&V_udbinfo); 237 uma_zdestroy(V_udpcb_zone); 238} 239#endif 240 241#ifdef INET 242/* 243 * Subroutine of udp_input(), which appends the provided mbuf chain to the 244 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 245 * contains the source address. If the socket ends up being an IPv6 socket, 246 * udp_append() will convert to a sockaddr_in6 before passing the address 247 * into the socket code. 248 */ 249static void 250udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off, 251 struct sockaddr_in *udp_in) 252{ 253 struct sockaddr *append_sa; 254 struct socket *so; 255 struct mbuf *opts = 0; 256#ifdef INET6 257 struct sockaddr_in6 udp_in6; 258#endif 259 struct udpcb *up; 260 261 INP_LOCK_ASSERT(inp); 262 263 /* 264 * Engage the tunneling protocol. 265 */ 266 up = intoudpcb(inp); 267 if (up->u_tun_func != NULL) { 268 (*up->u_tun_func)(n, off, inp); 269 return; 270 } 271 272 if (n == NULL) 273 return; 274 275 off += sizeof(struct udphdr); 276 277#ifdef IPSEC 278 /* Check AH/ESP integrity. */ 279 if (ipsec4_in_reject(n, inp)) { 280 m_freem(n); 281 IPSECSTAT_INC(in_polvio); 282 return; 283 } 284#ifdef IPSEC_NAT_T 285 up = intoudpcb(inp); 286 KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); 287 if (up->u_flags & UF_ESPINUDP_ALL) { /* IPSec UDP encaps. */ 288 n = udp4_espdecap(inp, n, off); 289 if (n == NULL) /* Consumed. */ 290 return; 291 } 292#endif /* IPSEC_NAT_T */ 293#endif /* IPSEC */ 294#ifdef MAC 295 if (mac_inpcb_check_deliver(inp, n) != 0) { 296 m_freem(n); 297 return; 298 } 299#endif /* MAC */ 300 if (inp->inp_flags & INP_CONTROLOPTS || 301 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 302#ifdef INET6 303 if (inp->inp_vflag & INP_IPV6) 304 (void)ip6_savecontrol_v4(inp, n, &opts, NULL); 305 else 306#endif /* INET6 */ 307 ip_savecontrol(inp, &opts, ip, n); 308 } 309#ifdef INET6 310 if (inp->inp_vflag & INP_IPV6) { 311 bzero(&udp_in6, sizeof(udp_in6)); 312 udp_in6.sin6_len = sizeof(udp_in6); 313 udp_in6.sin6_family = AF_INET6; 314 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 315 append_sa = (struct sockaddr *)&udp_in6; 316 } else 317#endif /* INET6 */ 318 append_sa = (struct sockaddr *)udp_in; 319 m_adj(n, off); 320 321 so = inp->inp_socket; 322 SOCKBUF_LOCK(&so->so_rcv); 323 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 324 SOCKBUF_UNLOCK(&so->so_rcv); 325 m_freem(n); 326 if (opts) 327 m_freem(opts); 328 UDPSTAT_INC(udps_fullsock); 329 } else 330 sorwakeup_locked(so); 331} 332 333void 334udp_input(struct mbuf *m, int off) 335{ 336 int iphlen = off; 337 struct ip *ip; 338 struct udphdr *uh; 339 struct ifnet *ifp; 340 struct inpcb *inp; 341 int len; 342 struct ip save_ip; 343 struct sockaddr_in udp_in; 344 struct m_tag *fwd_tag; 345 346 ifp = m->m_pkthdr.rcvif; 347 UDPSTAT_INC(udps_ipackets); 348 349 /* 350 * Strip IP options, if any; should skip this, make available to 351 * user, and use on returned packets, but we don't yet have a way to 352 * check the checksum with options still present. 353 */ 354 if (iphlen > sizeof (struct ip)) { 355 ip_stripoptions(m, (struct mbuf *)0); 356 iphlen = sizeof(struct ip); 357 } 358 359 /* 360 * Get IP and UDP header together in first mbuf. 361 */ 362 ip = mtod(m, struct ip *); 363 if (m->m_len < iphlen + sizeof(struct udphdr)) { 364 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 365 UDPSTAT_INC(udps_hdrops); 366 return; 367 } 368 ip = mtod(m, struct ip *); 369 } 370 uh = (struct udphdr *)((caddr_t)ip + iphlen); 371 372 /* 373 * Destination port of 0 is illegal, based on RFC768. 374 */ 375 if (uh->uh_dport == 0) 376 goto badunlocked; 377 378 /* 379 * Construct sockaddr format source address. Stuff source address 380 * and datagram in user buffer. 381 */ 382 bzero(&udp_in, sizeof(udp_in)); 383 udp_in.sin_len = sizeof(udp_in); 384 udp_in.sin_family = AF_INET; 385 udp_in.sin_port = uh->uh_sport; 386 udp_in.sin_addr = ip->ip_src; 387 388 /* 389 * Make mbuf data length reflect UDP length. If not enough data to 390 * reflect UDP length, drop. 391 */ 392 len = ntohs((u_short)uh->uh_ulen); 393 if (ip->ip_len != len) { 394 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 395 UDPSTAT_INC(udps_badlen); 396 goto badunlocked; 397 } 398 m_adj(m, len - ip->ip_len); 399 /* ip->ip_len = len; */ 400 } 401 402 /* 403 * Save a copy of the IP header in case we want restore it for 404 * sending an ICMP error message in response. 405 */ 406 if (!V_udp_blackhole) 407 save_ip = *ip; 408 else 409 memset(&save_ip, 0, sizeof(save_ip)); 410 411 /* 412 * Checksum extended UDP header and data. 413 */ 414 if (uh->uh_sum) { 415 u_short uh_sum; 416 417 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 418 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 419 uh_sum = m->m_pkthdr.csum_data; 420 else 421 uh_sum = in_pseudo(ip->ip_src.s_addr, 422 ip->ip_dst.s_addr, htonl((u_short)len + 423 m->m_pkthdr.csum_data + IPPROTO_UDP)); 424 uh_sum ^= 0xffff; 425 } else { 426 char b[9]; 427 428 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 429 bzero(((struct ipovly *)ip)->ih_x1, 9); 430 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 431 uh_sum = in_cksum(m, len + sizeof (struct ip)); 432 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 433 } 434 if (uh_sum) { 435 UDPSTAT_INC(udps_badsum); 436 m_freem(m); 437 return; 438 } 439 } else 440 UDPSTAT_INC(udps_nosum); 441 442 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 443 in_broadcast(ip->ip_dst, ifp)) { 444 struct inpcb *last; 445 struct ip_moptions *imo; 446 447 INP_INFO_RLOCK(&V_udbinfo); 448 last = NULL; 449 LIST_FOREACH(inp, &V_udb, inp_list) { 450 if (inp->inp_lport != uh->uh_dport) 451 continue; 452#ifdef INET6 453 if ((inp->inp_vflag & INP_IPV4) == 0) 454 continue; 455#endif 456 if (inp->inp_laddr.s_addr != INADDR_ANY && 457 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 458 continue; 459 if (inp->inp_faddr.s_addr != INADDR_ANY && 460 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 461 continue; 462 if (inp->inp_fport != 0 && 463 inp->inp_fport != uh->uh_sport) 464 continue; 465 466 INP_RLOCK(inp); 467 468 /* 469 * XXXRW: Because we weren't holding either the inpcb 470 * or the hash lock when we checked for a match 471 * before, we should probably recheck now that the 472 * inpcb lock is held. 473 */ 474 475 /* 476 * Handle socket delivery policy for any-source 477 * and source-specific multicast. [RFC3678] 478 */ 479 imo = inp->inp_moptions; 480 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 481 struct sockaddr_in group; 482 int blocked; 483 if (imo == NULL) { 484 INP_RUNLOCK(inp); 485 continue; 486 } 487 bzero(&group, sizeof(struct sockaddr_in)); 488 group.sin_len = sizeof(struct sockaddr_in); 489 group.sin_family = AF_INET; 490 group.sin_addr = ip->ip_dst; 491 492 blocked = imo_multi_filter(imo, ifp, 493 (struct sockaddr *)&group, 494 (struct sockaddr *)&udp_in); 495 if (blocked != MCAST_PASS) { 496 if (blocked == MCAST_NOTGMEMBER) 497 IPSTAT_INC(ips_notmember); 498 if (blocked == MCAST_NOTSMEMBER || 499 blocked == MCAST_MUTED) 500 UDPSTAT_INC(udps_filtermcast); 501 INP_RUNLOCK(inp); 502 continue; 503 } 504 } 505 if (last != NULL) { 506 struct mbuf *n; 507 508 n = m_copy(m, 0, M_COPYALL); 509 udp_append(last, ip, n, iphlen, &udp_in); 510 INP_RUNLOCK(last); 511 } 512 last = inp; 513 /* 514 * Don't look for additional matches if this one does 515 * not have either the SO_REUSEPORT or SO_REUSEADDR 516 * socket options set. This heuristic avoids 517 * searching through all pcbs in the common case of a 518 * non-shared port. It assumes that an application 519 * will never clear these options after setting them. 520 */ 521 if ((last->inp_socket->so_options & 522 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 523 break; 524 } 525 526 if (last == NULL) { 527 /* 528 * No matching pcb found; discard datagram. (No need 529 * to send an ICMP Port Unreachable for a broadcast 530 * or multicast datgram.) 531 */ 532 UDPSTAT_INC(udps_noportbcast); 533 if (inp) 534 INP_RUNLOCK(inp); 535 INP_INFO_RUNLOCK(&V_udbinfo); 536 goto badunlocked; 537 } 538 udp_append(last, ip, m, iphlen, &udp_in); 539 INP_RUNLOCK(last); 540 INP_INFO_RUNLOCK(&V_udbinfo); 541 return; 542 } 543 544 /* 545 * Locate pcb for datagram. 546 */ 547 548 /* 549 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 550 */ 551 if ((m->m_flags & M_IP_NEXTHOP) && 552 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 553 struct sockaddr_in *next_hop; 554 555 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 556 557 /* 558 * Transparently forwarded. Pretend to be the destination. 559 * Already got one like this? 560 */ 561 inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport, 562 ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m); 563 if (!inp) { 564 /* 565 * It's new. Try to find the ambushing socket. 566 * Because we've rewritten the destination address, 567 * any hardware-generated hash is ignored. 568 */ 569 inp = in_pcblookup(&V_udbinfo, ip->ip_src, 570 uh->uh_sport, next_hop->sin_addr, 571 next_hop->sin_port ? htons(next_hop->sin_port) : 572 uh->uh_dport, INPLOOKUP_WILDCARD | 573 INPLOOKUP_RLOCKPCB, ifp); 574 } 575 /* Remove the tag from the packet. We don't need it anymore. */ 576 m_tag_delete(m, fwd_tag); 577 m->m_flags &= ~M_IP_NEXTHOP; 578 } else 579 inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport, 580 ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD | 581 INPLOOKUP_RLOCKPCB, ifp, m); 582 if (inp == NULL) { 583 if (udp_log_in_vain) { 584 char buf[4*sizeof "123"]; 585 586 strcpy(buf, inet_ntoa(ip->ip_dst)); 587 log(LOG_INFO, 588 "Connection attempt to UDP %s:%d from %s:%d\n", 589 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 590 ntohs(uh->uh_sport)); 591 } 592 UDPSTAT_INC(udps_noport); 593 if (m->m_flags & (M_BCAST | M_MCAST)) { 594 UDPSTAT_INC(udps_noportbcast); 595 goto badunlocked; 596 } 597 if (V_udp_blackhole) 598 goto badunlocked; 599 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 600 goto badunlocked; 601 *ip = save_ip; 602 ip->ip_len += iphlen; 603 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 604 return; 605 } 606 607 /* 608 * Check the minimum TTL for socket. 609 */ 610 INP_RLOCK_ASSERT(inp); 611 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 612 INP_RUNLOCK(inp); 613 m_freem(m); 614 return; 615 } 616 udp_append(inp, ip, m, iphlen, &udp_in); 617 INP_RUNLOCK(inp); 618 return; 619 620badunlocked: 621 m_freem(m); 622} 623#endif /* INET */ 624 625/* 626 * Notify a udp user of an asynchronous error; just wake up so that they can 627 * collect error status. 628 */ 629struct inpcb * 630udp_notify(struct inpcb *inp, int errno) 631{ 632 633 /* 634 * While udp_ctlinput() always calls udp_notify() with a read lock 635 * when invoking it directly, in_pcbnotifyall() currently uses write 636 * locks due to sharing code with TCP. For now, accept either a read 637 * or a write lock, but a read lock is sufficient. 638 */ 639 INP_LOCK_ASSERT(inp); 640 641 inp->inp_socket->so_error = errno; 642 sorwakeup(inp->inp_socket); 643 sowwakeup(inp->inp_socket); 644 return (inp); 645} 646 647#ifdef INET 648void 649udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 650{ 651 struct ip *ip = vip; 652 struct udphdr *uh; 653 struct in_addr faddr; 654 struct inpcb *inp; 655 656 faddr = ((struct sockaddr_in *)sa)->sin_addr; 657 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 658 return; 659 660 /* 661 * Redirects don't need to be handled up here. 662 */ 663 if (PRC_IS_REDIRECT(cmd)) 664 return; 665 666 /* 667 * Hostdead is ugly because it goes linearly through all PCBs. 668 * 669 * XXX: We never get this from ICMP, otherwise it makes an excellent 670 * DoS attack on machines with many connections. 671 */ 672 if (cmd == PRC_HOSTDEAD) 673 ip = NULL; 674 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 675 return; 676 if (ip != NULL) { 677 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 678 inp = in_pcblookup(&V_udbinfo, faddr, uh->uh_dport, 679 ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL); 680 if (inp != NULL) { 681 INP_RLOCK_ASSERT(inp); 682 if (inp->inp_socket != NULL) { 683 udp_notify(inp, inetctlerrmap[cmd]); 684 } 685 INP_RUNLOCK(inp); 686 } 687 } else 688 in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd], 689 udp_notify); 690} 691#endif /* INET */ 692 693static int 694udp_pcblist(SYSCTL_HANDLER_ARGS) 695{ 696 int error, i, n; 697 struct inpcb *inp, **inp_list; 698 inp_gen_t gencnt; 699 struct xinpgen xig; 700 701 /* 702 * The process of preparing the PCB list is too time-consuming and 703 * resource-intensive to repeat twice on every request. 704 */ 705 if (req->oldptr == 0) { 706 n = V_udbinfo.ipi_count; 707 n += imax(n / 8, 10); 708 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 709 return (0); 710 } 711 712 if (req->newptr != 0) 713 return (EPERM); 714 715 /* 716 * OK, now we're committed to doing something. 717 */ 718 INP_INFO_RLOCK(&V_udbinfo); 719 gencnt = V_udbinfo.ipi_gencnt; 720 n = V_udbinfo.ipi_count; 721 INP_INFO_RUNLOCK(&V_udbinfo); 722 723 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 724 + n * sizeof(struct xinpcb)); 725 if (error != 0) 726 return (error); 727 728 xig.xig_len = sizeof xig; 729 xig.xig_count = n; 730 xig.xig_gen = gencnt; 731 xig.xig_sogen = so_gencnt; 732 error = SYSCTL_OUT(req, &xig, sizeof xig); 733 if (error) 734 return (error); 735 736 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 737 if (inp_list == 0) 738 return (ENOMEM); 739 740 INP_INFO_RLOCK(&V_udbinfo); 741 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; 742 inp = LIST_NEXT(inp, inp_list)) { 743 INP_WLOCK(inp); 744 if (inp->inp_gencnt <= gencnt && 745 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 746 in_pcbref(inp); 747 inp_list[i++] = inp; 748 } 749 INP_WUNLOCK(inp); 750 } 751 INP_INFO_RUNLOCK(&V_udbinfo); 752 n = i; 753 754 error = 0; 755 for (i = 0; i < n; i++) { 756 inp = inp_list[i]; 757 INP_RLOCK(inp); 758 if (inp->inp_gencnt <= gencnt) { 759 struct xinpcb xi; 760 761 bzero(&xi, sizeof(xi)); 762 xi.xi_len = sizeof xi; 763 /* XXX should avoid extra copy */ 764 bcopy(inp, &xi.xi_inp, sizeof *inp); 765 if (inp->inp_socket) 766 sotoxsocket(inp->inp_socket, &xi.xi_socket); 767 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 768 INP_RUNLOCK(inp); 769 error = SYSCTL_OUT(req, &xi, sizeof xi); 770 } else 771 INP_RUNLOCK(inp); 772 } 773 INP_INFO_WLOCK(&V_udbinfo); 774 for (i = 0; i < n; i++) { 775 inp = inp_list[i]; 776 INP_RLOCK(inp); 777 if (!in_pcbrele_rlocked(inp)) 778 INP_RUNLOCK(inp); 779 } 780 INP_INFO_WUNLOCK(&V_udbinfo); 781 782 if (!error) { 783 /* 784 * Give the user an updated idea of our state. If the 785 * generation differs from what we told her before, she knows 786 * that something happened while we were processing this 787 * request, and it might be necessary to retry. 788 */ 789 INP_INFO_RLOCK(&V_udbinfo); 790 xig.xig_gen = V_udbinfo.ipi_gencnt; 791 xig.xig_sogen = so_gencnt; 792 xig.xig_count = V_udbinfo.ipi_count; 793 INP_INFO_RUNLOCK(&V_udbinfo); 794 error = SYSCTL_OUT(req, &xig, sizeof xig); 795 } 796 free(inp_list, M_TEMP); 797 return (error); 798} 799 800SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, 801 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 802 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 803 804#ifdef INET 805static int 806udp_getcred(SYSCTL_HANDLER_ARGS) 807{ 808 struct xucred xuc; 809 struct sockaddr_in addrs[2]; 810 struct inpcb *inp; 811 int error; 812 813 error = priv_check(req->td, PRIV_NETINET_GETCRED); 814 if (error) 815 return (error); 816 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 817 if (error) 818 return (error); 819 inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 820 addrs[0].sin_addr, addrs[0].sin_port, 821 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); 822 if (inp != NULL) { 823 INP_RLOCK_ASSERT(inp); 824 if (inp->inp_socket == NULL) 825 error = ENOENT; 826 if (error == 0) 827 error = cr_canseeinpcb(req->td->td_ucred, inp); 828 if (error == 0) 829 cru2x(inp->inp_cred, &xuc); 830 INP_RUNLOCK(inp); 831 } else 832 error = ENOENT; 833 if (error == 0) 834 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 835 return (error); 836} 837 838SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 839 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 840 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 841#endif /* INET */ 842 843int 844udp_ctloutput(struct socket *so, struct sockopt *sopt) 845{ 846 int error = 0, optval; 847 struct inpcb *inp; 848#ifdef IPSEC_NAT_T 849 struct udpcb *up; 850#endif 851 852 inp = sotoinpcb(so); 853 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 854 INP_WLOCK(inp); 855 if (sopt->sopt_level != IPPROTO_UDP) { 856#ifdef INET6 857 if (INP_CHECK_SOCKAF(so, AF_INET6)) { 858 INP_WUNLOCK(inp); 859 error = ip6_ctloutput(so, sopt); 860 } 861#endif 862#if defined(INET) && defined(INET6) 863 else 864#endif 865#ifdef INET 866 { 867 INP_WUNLOCK(inp); 868 error = ip_ctloutput(so, sopt); 869 } 870#endif 871 return (error); 872 } 873 874 switch (sopt->sopt_dir) { 875 case SOPT_SET: 876 switch (sopt->sopt_name) { 877 case UDP_ENCAP: 878 INP_WUNLOCK(inp); 879 error = sooptcopyin(sopt, &optval, sizeof optval, 880 sizeof optval); 881 if (error) 882 break; 883 inp = sotoinpcb(so); 884 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 885 INP_WLOCK(inp); 886#ifdef IPSEC_NAT_T 887 up = intoudpcb(inp); 888 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 889#endif 890 switch (optval) { 891 case 0: 892 /* Clear all UDP encap. */ 893#ifdef IPSEC_NAT_T 894 up->u_flags &= ~UF_ESPINUDP_ALL; 895#endif 896 break; 897#ifdef IPSEC_NAT_T 898 case UDP_ENCAP_ESPINUDP: 899 case UDP_ENCAP_ESPINUDP_NON_IKE: 900 up->u_flags &= ~UF_ESPINUDP_ALL; 901 if (optval == UDP_ENCAP_ESPINUDP) 902 up->u_flags |= UF_ESPINUDP; 903 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE) 904 up->u_flags |= UF_ESPINUDP_NON_IKE; 905 break; 906#endif 907 default: 908 error = EINVAL; 909 break; 910 } 911 INP_WUNLOCK(inp); 912 break; 913 default: 914 INP_WUNLOCK(inp); 915 error = ENOPROTOOPT; 916 break; 917 } 918 break; 919 case SOPT_GET: 920 switch (sopt->sopt_name) { 921#ifdef IPSEC_NAT_T 922 case UDP_ENCAP: 923 up = intoudpcb(inp); 924 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 925 optval = up->u_flags & UF_ESPINUDP_ALL; 926 INP_WUNLOCK(inp); 927 error = sooptcopyout(sopt, &optval, sizeof optval); 928 break; 929#endif 930 default: 931 INP_WUNLOCK(inp); 932 error = ENOPROTOOPT; 933 break; 934 } 935 break; 936 } 937 return (error); 938} 939 940#ifdef INET 941#define UH_WLOCKED 2 942#define UH_RLOCKED 1 943#define UH_UNLOCKED 0 944static int 945udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 946 struct mbuf *control, struct thread *td) 947{ 948 struct udpiphdr *ui; 949 int len = m->m_pkthdr.len; 950 struct in_addr faddr, laddr; 951 struct cmsghdr *cm; 952 struct sockaddr_in *sin, src; 953 int error = 0; 954 int ipflags; 955 u_short fport, lport; 956 int unlock_udbinfo; 957 u_char tos; 958 959 /* 960 * udp_output() may need to temporarily bind or connect the current 961 * inpcb. As such, we don't know up front whether we will need the 962 * pcbinfo lock or not. Do any work to decide what is needed up 963 * front before acquiring any locks. 964 */ 965 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 966 if (control) 967 m_freem(control); 968 m_freem(m); 969 return (EMSGSIZE); 970 } 971 972 src.sin_family = 0; 973 INP_RLOCK(inp); 974 tos = inp->inp_ip_tos; 975 if (control != NULL) { 976 /* 977 * XXX: Currently, we assume all the optional information is 978 * stored in a single mbuf. 979 */ 980 if (control->m_next) { 981 INP_RUNLOCK(inp); 982 m_freem(control); 983 m_freem(m); 984 return (EINVAL); 985 } 986 for (; control->m_len > 0; 987 control->m_data += CMSG_ALIGN(cm->cmsg_len), 988 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 989 cm = mtod(control, struct cmsghdr *); 990 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 991 || cm->cmsg_len > control->m_len) { 992 error = EINVAL; 993 break; 994 } 995 if (cm->cmsg_level != IPPROTO_IP) 996 continue; 997 998 switch (cm->cmsg_type) { 999 case IP_SENDSRCADDR: 1000 if (cm->cmsg_len != 1001 CMSG_LEN(sizeof(struct in_addr))) { 1002 error = EINVAL; 1003 break; 1004 } 1005 bzero(&src, sizeof(src)); 1006 src.sin_family = AF_INET; 1007 src.sin_len = sizeof(src); 1008 src.sin_port = inp->inp_lport; 1009 src.sin_addr = 1010 *(struct in_addr *)CMSG_DATA(cm); 1011 break; 1012 1013 case IP_TOS: 1014 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) { 1015 error = EINVAL; 1016 break; 1017 } 1018 tos = *(u_char *)CMSG_DATA(cm); 1019 break; 1020 1021 default: 1022 error = ENOPROTOOPT; 1023 break; 1024 } 1025 if (error) 1026 break; 1027 } 1028 m_freem(control); 1029 } 1030 if (error) { 1031 INP_RUNLOCK(inp); 1032 m_freem(m); 1033 return (error); 1034 } 1035 1036 /* 1037 * Depending on whether or not the application has bound or connected 1038 * the socket, we may have to do varying levels of work. The optimal 1039 * case is for a connected UDP socket, as a global lock isn't 1040 * required at all. 1041 * 1042 * In order to decide which we need, we require stability of the 1043 * inpcb binding, which we ensure by acquiring a read lock on the 1044 * inpcb. This doesn't strictly follow the lock order, so we play 1045 * the trylock and retry game; note that we may end up with more 1046 * conservative locks than required the second time around, so later 1047 * assertions have to accept that. Further analysis of the number of 1048 * misses under contention is required. 1049 * 1050 * XXXRW: Check that hash locking update here is correct. 1051 */ 1052 sin = (struct sockaddr_in *)addr; 1053 if (sin != NULL && 1054 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 1055 INP_RUNLOCK(inp); 1056 INP_WLOCK(inp); 1057 INP_HASH_WLOCK(&V_udbinfo); 1058 unlock_udbinfo = UH_WLOCKED; 1059 } else if ((sin != NULL && ( 1060 (sin->sin_addr.s_addr == INADDR_ANY) || 1061 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 1062 (inp->inp_laddr.s_addr == INADDR_ANY) || 1063 (inp->inp_lport == 0))) || 1064 (src.sin_family == AF_INET)) { 1065 INP_HASH_RLOCK(&V_udbinfo); 1066 unlock_udbinfo = UH_RLOCKED; 1067 } else 1068 unlock_udbinfo = UH_UNLOCKED; 1069 1070 /* 1071 * If the IP_SENDSRCADDR control message was specified, override the 1072 * source address for this datagram. Its use is invalidated if the 1073 * address thus specified is incomplete or clobbers other inpcbs. 1074 */ 1075 laddr = inp->inp_laddr; 1076 lport = inp->inp_lport; 1077 if (src.sin_family == AF_INET) { 1078 INP_HASH_LOCK_ASSERT(&V_udbinfo); 1079 if ((lport == 0) || 1080 (laddr.s_addr == INADDR_ANY && 1081 src.sin_addr.s_addr == INADDR_ANY)) { 1082 error = EINVAL; 1083 goto release; 1084 } 1085 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 1086 &laddr.s_addr, &lport, td->td_ucred); 1087 if (error) 1088 goto release; 1089 } 1090 1091 /* 1092 * If a UDP socket has been connected, then a local address/port will 1093 * have been selected and bound. 1094 * 1095 * If a UDP socket has not been connected to, then an explicit 1096 * destination address must be used, in which case a local 1097 * address/port may not have been selected and bound. 1098 */ 1099 if (sin != NULL) { 1100 INP_LOCK_ASSERT(inp); 1101 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1102 error = EISCONN; 1103 goto release; 1104 } 1105 1106 /* 1107 * Jail may rewrite the destination address, so let it do 1108 * that before we use it. 1109 */ 1110 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1111 if (error) 1112 goto release; 1113 1114 /* 1115 * If a local address or port hasn't yet been selected, or if 1116 * the destination address needs to be rewritten due to using 1117 * a special INADDR_ constant, invoke in_pcbconnect_setup() 1118 * to do the heavy lifting. Once a port is selected, we 1119 * commit the binding back to the socket; we also commit the 1120 * binding of the address if in jail. 1121 * 1122 * If we already have a valid binding and we're not 1123 * requesting a destination address rewrite, use a fast path. 1124 */ 1125 if (inp->inp_laddr.s_addr == INADDR_ANY || 1126 inp->inp_lport == 0 || 1127 sin->sin_addr.s_addr == INADDR_ANY || 1128 sin->sin_addr.s_addr == INADDR_BROADCAST) { 1129 INP_HASH_LOCK_ASSERT(&V_udbinfo); 1130 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 1131 &lport, &faddr.s_addr, &fport, NULL, 1132 td->td_ucred); 1133 if (error) 1134 goto release; 1135 1136 /* 1137 * XXXRW: Why not commit the port if the address is 1138 * !INADDR_ANY? 1139 */ 1140 /* Commit the local port if newly assigned. */ 1141 if (inp->inp_laddr.s_addr == INADDR_ANY && 1142 inp->inp_lport == 0) { 1143 INP_WLOCK_ASSERT(inp); 1144 INP_HASH_WLOCK_ASSERT(&V_udbinfo); 1145 /* 1146 * Remember addr if jailed, to prevent 1147 * rebinding. 1148 */ 1149 if (prison_flag(td->td_ucred, PR_IP4)) 1150 inp->inp_laddr = laddr; 1151 inp->inp_lport = lport; 1152 if (in_pcbinshash(inp) != 0) { 1153 inp->inp_lport = 0; 1154 error = EAGAIN; 1155 goto release; 1156 } 1157 inp->inp_flags |= INP_ANONPORT; 1158 } 1159 } else { 1160 faddr = sin->sin_addr; 1161 fport = sin->sin_port; 1162 } 1163 } else { 1164 INP_LOCK_ASSERT(inp); 1165 faddr = inp->inp_faddr; 1166 fport = inp->inp_fport; 1167 if (faddr.s_addr == INADDR_ANY) { 1168 error = ENOTCONN; 1169 goto release; 1170 } 1171 } 1172 1173 /* 1174 * Calculate data length and get a mbuf for UDP, IP, and possible 1175 * link-layer headers. Immediate slide the data pointer back forward 1176 * since we won't use that space at this layer. 1177 */ 1178 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 1179 if (m == NULL) { 1180 error = ENOBUFS; 1181 goto release; 1182 } 1183 m->m_data += max_linkhdr; 1184 m->m_len -= max_linkhdr; 1185 m->m_pkthdr.len -= max_linkhdr; 1186 1187 /* 1188 * Fill in mbuf with extended UDP header and addresses and length put 1189 * into network format. 1190 */ 1191 ui = mtod(m, struct udpiphdr *); 1192 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1193 ui->ui_pr = IPPROTO_UDP; 1194 ui->ui_src = laddr; 1195 ui->ui_dst = faddr; 1196 ui->ui_sport = lport; 1197 ui->ui_dport = fport; 1198 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1199 1200 /* 1201 * Set the Don't Fragment bit in the IP header. 1202 */ 1203 if (inp->inp_flags & INP_DONTFRAG) { 1204 struct ip *ip; 1205 1206 ip = (struct ip *)&ui->ui_i; 1207 ip->ip_off |= IP_DF; 1208 } 1209 1210 ipflags = 0; 1211 if (inp->inp_socket->so_options & SO_DONTROUTE) 1212 ipflags |= IP_ROUTETOIF; 1213 if (inp->inp_socket->so_options & SO_BROADCAST) 1214 ipflags |= IP_ALLOWBROADCAST; 1215 if (inp->inp_flags & INP_ONESBCAST) 1216 ipflags |= IP_SENDONES; 1217 1218#ifdef MAC 1219 mac_inpcb_create_mbuf(inp, m); 1220#endif 1221 1222 /* 1223 * Set up checksum and output datagram. 1224 */ 1225 if (V_udp_cksum) { 1226 if (inp->inp_flags & INP_ONESBCAST) 1227 faddr.s_addr = INADDR_BROADCAST; 1228 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1229 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 1230 m->m_pkthdr.csum_flags = CSUM_UDP; 1231 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1232 } else 1233 ui->ui_sum = 0; 1234 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 1235 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1236 ((struct ip *)ui)->ip_tos = tos; /* XXX */ 1237 UDPSTAT_INC(udps_opackets); 1238 1239 if (unlock_udbinfo == UH_WLOCKED) 1240 INP_HASH_WUNLOCK(&V_udbinfo); 1241 else if (unlock_udbinfo == UH_RLOCKED) 1242 INP_HASH_RUNLOCK(&V_udbinfo); 1243 error = ip_output(m, inp->inp_options, NULL, ipflags, 1244 inp->inp_moptions, inp); 1245 if (unlock_udbinfo == UH_WLOCKED) 1246 INP_WUNLOCK(inp); 1247 else 1248 INP_RUNLOCK(inp); 1249 return (error); 1250 1251release: 1252 if (unlock_udbinfo == UH_WLOCKED) { 1253 INP_HASH_WUNLOCK(&V_udbinfo); 1254 INP_WUNLOCK(inp); 1255 } else if (unlock_udbinfo == UH_RLOCKED) { 1256 INP_HASH_RUNLOCK(&V_udbinfo); 1257 INP_RUNLOCK(inp); 1258 } else 1259 INP_RUNLOCK(inp); 1260 m_freem(m); 1261 return (error); 1262} 1263 1264 1265#if defined(IPSEC) && defined(IPSEC_NAT_T) 1266/* 1267 * Potentially decap ESP in UDP frame. Check for an ESP header 1268 * and optional marker; if present, strip the UDP header and 1269 * push the result through IPSec. 1270 * 1271 * Returns mbuf to be processed (potentially re-allocated) or 1272 * NULL if consumed and/or processed. 1273 */ 1274static struct mbuf * 1275udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off) 1276{ 1277 size_t minlen, payload, skip, iphlen; 1278 caddr_t data; 1279 struct udpcb *up; 1280 struct m_tag *tag; 1281 struct udphdr *udphdr; 1282 struct ip *ip; 1283 1284 INP_RLOCK_ASSERT(inp); 1285 1286 /* 1287 * Pull up data so the longest case is contiguous: 1288 * IP/UDP hdr + non ESP marker + ESP hdr. 1289 */ 1290 minlen = off + sizeof(uint64_t) + sizeof(struct esp); 1291 if (minlen > m->m_pkthdr.len) 1292 minlen = m->m_pkthdr.len; 1293 if ((m = m_pullup(m, minlen)) == NULL) { 1294 IPSECSTAT_INC(in_inval); 1295 return (NULL); /* Bypass caller processing. */ 1296 } 1297 data = mtod(m, caddr_t); /* Points to ip header. */ 1298 payload = m->m_len - off; /* Size of payload. */ 1299 1300 if (payload == 1 && data[off] == '\xff') 1301 return (m); /* NB: keepalive packet, no decap. */ 1302 1303 up = intoudpcb(inp); 1304 KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); 1305 KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0, 1306 ("u_flags 0x%x", up->u_flags)); 1307 1308 /* 1309 * Check that the payload is large enough to hold an 1310 * ESP header and compute the amount of data to remove. 1311 * 1312 * NB: the caller has already done a pullup for us. 1313 * XXX can we assume alignment and eliminate bcopys? 1314 */ 1315 if (up->u_flags & UF_ESPINUDP_NON_IKE) { 1316 /* 1317 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 1318 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring 1319 * possible AH mode non-IKE marker+non-ESP marker 1320 * from draft-ietf-ipsec-udp-encaps-00.txt. 1321 */ 1322 uint64_t marker; 1323 1324 if (payload <= sizeof(uint64_t) + sizeof(struct esp)) 1325 return (m); /* NB: no decap. */ 1326 bcopy(data + off, &marker, sizeof(uint64_t)); 1327 if (marker != 0) /* Non-IKE marker. */ 1328 return (m); /* NB: no decap. */ 1329 skip = sizeof(uint64_t) + sizeof(struct udphdr); 1330 } else { 1331 uint32_t spi; 1332 1333 if (payload <= sizeof(struct esp)) { 1334 IPSECSTAT_INC(in_inval); 1335 m_freem(m); 1336 return (NULL); /* Discard. */ 1337 } 1338 bcopy(data + off, &spi, sizeof(uint32_t)); 1339 if (spi == 0) /* Non-ESP marker. */ 1340 return (m); /* NB: no decap. */ 1341 skip = sizeof(struct udphdr); 1342 } 1343 1344 /* 1345 * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1346 * the UDP ports. This is required if we want to select 1347 * the right SPD for multiple hosts behind same NAT. 1348 * 1349 * NB: ports are maintained in network byte order everywhere 1350 * in the NAT-T code. 1351 */ 1352 tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1353 2 * sizeof(uint16_t), M_NOWAIT); 1354 if (tag == NULL) { 1355 IPSECSTAT_INC(in_nomem); 1356 m_freem(m); 1357 return (NULL); /* Discard. */ 1358 } 1359 iphlen = off - sizeof(struct udphdr); 1360 udphdr = (struct udphdr *)(data + iphlen); 1361 ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport; 1362 ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport; 1363 m_tag_prepend(m, tag); 1364 1365 /* 1366 * Remove the UDP header (and possibly the non ESP marker) 1367 * IP header length is iphlen 1368 * Before: 1369 * <--- off ---> 1370 * +----+------+-----+ 1371 * | IP | UDP | ESP | 1372 * +----+------+-----+ 1373 * <-skip-> 1374 * After: 1375 * +----+-----+ 1376 * | IP | ESP | 1377 * +----+-----+ 1378 * <-skip-> 1379 */ 1380 ovbcopy(data, data + skip, iphlen); 1381 m_adj(m, skip); 1382 1383 ip = mtod(m, struct ip *); 1384 ip->ip_len -= skip; 1385 ip->ip_p = IPPROTO_ESP; 1386 1387 /* 1388 * We cannot yet update the cksums so clear any 1389 * h/w cksum flags as they are no longer valid. 1390 */ 1391 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) 1392 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 1393 1394 (void) ipsec4_common_input(m, iphlen, ip->ip_p); 1395 return (NULL); /* NB: consumed, bypass processing. */ 1396} 1397#endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */ 1398 1399static void 1400udp_abort(struct socket *so) 1401{ 1402 struct inpcb *inp; 1403 1404 inp = sotoinpcb(so); 1405 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1406 INP_WLOCK(inp); 1407 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1408 INP_HASH_WLOCK(&V_udbinfo); 1409 in_pcbdisconnect(inp); 1410 inp->inp_laddr.s_addr = INADDR_ANY; 1411 INP_HASH_WUNLOCK(&V_udbinfo); 1412 soisdisconnected(so); 1413 } 1414 INP_WUNLOCK(inp); 1415} 1416 1417static int 1418udp_attach(struct socket *so, int proto, struct thread *td) 1419{ 1420 struct inpcb *inp; 1421 int error; 1422 1423 inp = sotoinpcb(so); 1424 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1425 error = soreserve(so, udp_sendspace, udp_recvspace); 1426 if (error) 1427 return (error); 1428 INP_INFO_WLOCK(&V_udbinfo); 1429 error = in_pcballoc(so, &V_udbinfo); 1430 if (error) { 1431 INP_INFO_WUNLOCK(&V_udbinfo); 1432 return (error); 1433 } 1434 1435 inp = sotoinpcb(so); 1436 inp->inp_vflag |= INP_IPV4; 1437 inp->inp_ip_ttl = V_ip_defttl; 1438 1439 error = udp_newudpcb(inp); 1440 if (error) { 1441 in_pcbdetach(inp); 1442 in_pcbfree(inp); 1443 INP_INFO_WUNLOCK(&V_udbinfo); 1444 return (error); 1445 } 1446 1447 INP_WUNLOCK(inp); 1448 INP_INFO_WUNLOCK(&V_udbinfo); 1449 return (0); 1450} 1451#endif /* INET */ 1452 1453int 1454udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f) 1455{ 1456 struct inpcb *inp; 1457 struct udpcb *up; 1458 1459 KASSERT(so->so_type == SOCK_DGRAM, 1460 ("udp_set_kernel_tunneling: !dgram")); 1461 inp = sotoinpcb(so); 1462 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL")); 1463 INP_WLOCK(inp); 1464 up = intoudpcb(inp); 1465 if (up->u_tun_func != NULL) { 1466 INP_WUNLOCK(inp); 1467 return (EBUSY); 1468 } 1469 up->u_tun_func = f; 1470 INP_WUNLOCK(inp); 1471 return (0); 1472} 1473 1474#ifdef INET 1475static int 1476udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1477{ 1478 struct inpcb *inp; 1479 int error; 1480 1481 inp = sotoinpcb(so); 1482 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1483 INP_WLOCK(inp); 1484 INP_HASH_WLOCK(&V_udbinfo); 1485 error = in_pcbbind(inp, nam, td->td_ucred); 1486 INP_HASH_WUNLOCK(&V_udbinfo); 1487 INP_WUNLOCK(inp); 1488 return (error); 1489} 1490 1491static void 1492udp_close(struct socket *so) 1493{ 1494 struct inpcb *inp; 1495 1496 inp = sotoinpcb(so); 1497 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1498 INP_WLOCK(inp); 1499 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1500 INP_HASH_WLOCK(&V_udbinfo); 1501 in_pcbdisconnect(inp); 1502 inp->inp_laddr.s_addr = INADDR_ANY; 1503 INP_HASH_WUNLOCK(&V_udbinfo); 1504 soisdisconnected(so); 1505 } 1506 INP_WUNLOCK(inp); 1507} 1508 1509static int 1510udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1511{ 1512 struct inpcb *inp; 1513 int error; 1514 struct sockaddr_in *sin; 1515 1516 inp = sotoinpcb(so); 1517 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1518 INP_WLOCK(inp); 1519 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1520 INP_WUNLOCK(inp); 1521 return (EISCONN); 1522 } 1523 sin = (struct sockaddr_in *)nam; 1524 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1525 if (error != 0) { 1526 INP_WUNLOCK(inp); 1527 return (error); 1528 } 1529 INP_HASH_WLOCK(&V_udbinfo); 1530 error = in_pcbconnect(inp, nam, td->td_ucred); 1531 INP_HASH_WUNLOCK(&V_udbinfo); 1532 if (error == 0) 1533 soisconnected(so); 1534 INP_WUNLOCK(inp); 1535 return (error); 1536} 1537 1538static void 1539udp_detach(struct socket *so) 1540{ 1541 struct inpcb *inp; 1542 struct udpcb *up; 1543 1544 inp = sotoinpcb(so); 1545 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1546 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1547 ("udp_detach: not disconnected")); 1548 INP_INFO_WLOCK(&V_udbinfo); 1549 INP_WLOCK(inp); 1550 up = intoudpcb(inp); 1551 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1552 inp->inp_ppcb = NULL; 1553 in_pcbdetach(inp); 1554 in_pcbfree(inp); 1555 INP_INFO_WUNLOCK(&V_udbinfo); 1556 udp_discardcb(up); 1557} 1558 1559static int 1560udp_disconnect(struct socket *so) 1561{ 1562 struct inpcb *inp; 1563 1564 inp = sotoinpcb(so); 1565 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1566 INP_WLOCK(inp); 1567 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1568 INP_WUNLOCK(inp); 1569 return (ENOTCONN); 1570 } 1571 INP_HASH_WLOCK(&V_udbinfo); 1572 in_pcbdisconnect(inp); 1573 inp->inp_laddr.s_addr = INADDR_ANY; 1574 INP_HASH_WUNLOCK(&V_udbinfo); 1575 SOCK_LOCK(so); 1576 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1577 SOCK_UNLOCK(so); 1578 INP_WUNLOCK(inp); 1579 return (0); 1580} 1581 1582static int 1583udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1584 struct mbuf *control, struct thread *td) 1585{ 1586 struct inpcb *inp; 1587 1588 inp = sotoinpcb(so); 1589 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1590 return (udp_output(inp, m, addr, control, td)); 1591} 1592#endif /* INET */ 1593 1594int 1595udp_shutdown(struct socket *so) 1596{ 1597 struct inpcb *inp; 1598 1599 inp = sotoinpcb(so); 1600 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1601 INP_WLOCK(inp); 1602 socantsendmore(so); 1603 INP_WUNLOCK(inp); 1604 return (0); 1605} 1606 1607#ifdef INET 1608struct pr_usrreqs udp_usrreqs = { 1609 .pru_abort = udp_abort, 1610 .pru_attach = udp_attach, 1611 .pru_bind = udp_bind, 1612 .pru_connect = udp_connect, 1613 .pru_control = in_control, 1614 .pru_detach = udp_detach, 1615 .pru_disconnect = udp_disconnect, 1616 .pru_peeraddr = in_getpeeraddr, 1617 .pru_send = udp_send, 1618 .pru_soreceive = soreceive_dgram, 1619 .pru_sosend = sosend_dgram, 1620 .pru_shutdown = udp_shutdown, 1621 .pru_sockaddr = in_getsockaddr, 1622 .pru_sosetlabel = in_pcbsosetlabel, 1623 .pru_close = udp_close, 1624}; 1625#endif /* INET */ 1626