Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/udp_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 3 * The Regents of the University of California. 4 * Copyright (c) 2008 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/8.3/sys/netinet/udp_usrreq.c 231391 2012-02-10 17:49:14Z tuexen $"); 36 37 #include "opt_ipfw.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/param.h> 42 #include <sys/domain.h> 43 #include <sys/eventhandler.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/protosw.h> 52 #include <sys/signalvar.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/syslog.h> 58 #include <sys/systm.h> 59 60 #include <vm/uma.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_pcb.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/in_var.h> 69 #include <netinet/ip.h> 70 #ifdef INET6 71 #include <netinet/ip6.h> 72 #endif 73 #include <netinet/ip_icmp.h> 74 #include <netinet/icmp_var.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_options.h> 77 #ifdef INET6 78 #include <netinet6/ip6_var.h> 79 #endif 80 #include <netinet/udp.h> 81 #include <netinet/udp_var.h> 82 83 #ifdef IPSEC 84 #include <netipsec/ipsec.h> 85 #include <netipsec/esp.h> 86 #endif 87 88 #include <machine/in_cksum.h> 89 90 #include <security/mac/mac_framework.h> 91 92 /* 93 * UDP protocol implementation. 94 * Per RFC 768, August, 1980. 95 */ 96 97 /* 98 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums 99 * removes the only data integrity mechanism for packets and malformed 100 * packets that would otherwise be discarded due to bad checksums, and may 101 * cause problems (especially for NFS data blocks). 102 */ 103 static int udp_cksum = 1; 104 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udp_cksum, 105 0, "compute udp checksum"); 106 107 int udp_log_in_vain = 0; 108 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, 109 &udp_log_in_vain, 0, "Log all incoming UDP packets"); 110 111 VNET_DEFINE(int, udp_blackhole) = 0; 112 SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, 113 &VNET_NAME(udp_blackhole), 0, 114 "Do not send port unreachables for refused connects"); 115 116 u_long udp_sendspace = 9216; /* really max datagram size */ 117 /* 40 1K datagrams */ 118 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, 119 &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); 120 121 u_long udp_recvspace = 40 * (1024 + 122 #ifdef INET6 123 sizeof(struct sockaddr_in6) 124 #else 125 sizeof(struct sockaddr_in) 126 #endif 127 ); 128 129 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 130 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); 131 132 VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */ 133 VNET_DEFINE(struct inpcbinfo, udbinfo); 134 static VNET_DEFINE(uma_zone_t, udpcb_zone); 135 #define V_udpcb_zone VNET(udpcb_zone) 136 137 #ifndef UDBHASHSIZE 138 #define UDBHASHSIZE 128 139 #endif 140 141 VNET_DEFINE(struct udpstat, udpstat); /* from udp_var.h */ 142 SYSCTL_VNET_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, 143 &VNET_NAME(udpstat), udpstat, 144 "UDP statistics (struct udpstat, netinet/udp_var.h)"); 145 146 static void udp_detach(struct socket *so); 147 static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, 148 struct mbuf *, struct thread *); 149 #ifdef IPSEC 150 #ifdef IPSEC_NAT_T 151 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP) 152 #ifdef INET 153 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int); 154 #endif 155 #endif /* IPSEC_NAT_T */ 156 #endif /* IPSEC */ 157 158 static void 159 udp_zone_change(void *tag) 160 { 161 162 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); 163 uma_zone_set_max(V_udpcb_zone, maxsockets); 164 } 165 166 static int 167 udp_inpcb_init(void *mem, int size, int flags) 168 { 169 struct inpcb *inp; 170 171 inp = mem; 172 INP_LOCK_INIT(inp, "inp", "udpinp"); 173 return (0); 174 } 175 176 void 177 udp_init(void) 178 { 179 180 181 INP_INFO_LOCK_INIT(&V_udbinfo, "udp"); 182 LIST_INIT(&V_udb); 183 #ifdef VIMAGE 184 V_udbinfo.ipi_vnet = curvnet; 185 #endif 186 V_udbinfo.ipi_listhead = &V_udb; 187 V_udbinfo.ipi_hashbase = hashinit(UDBHASHSIZE, M_PCB, 188 &V_udbinfo.ipi_hashmask); 189 V_udbinfo.ipi_porthashbase = hashinit(UDBHASHSIZE, M_PCB, 190 &V_udbinfo.ipi_porthashmask); 191 V_udbinfo.ipi_zone = uma_zcreate("udp_inpcb", sizeof(struct inpcb), 192 NULL, NULL, udp_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 193 uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); 194 195 V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb), 196 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 197 uma_zone_set_max(V_udpcb_zone, maxsockets); 198 199 EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, 200 EVENTHANDLER_PRI_ANY); 201 } 202 203 /* 204 * Kernel module interface for updating udpstat. The argument is an index 205 * into udpstat treated as an array of u_long. While this encodes the 206 * general layout of udpstat into the caller, it doesn't encode its location, 207 * so that future changes to add, for example, per-CPU stats support won't 208 * cause binary compatibility problems for kernel modules. 209 */ 210 void 211 kmod_udpstat_inc(int statnum) 212 { 213 214 (*((u_long *)&V_udpstat + statnum))++; 215 } 216 217 int 218 udp_newudpcb(struct inpcb *inp) 219 { 220 struct udpcb *up; 221 222 up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO); 223 if (up == NULL) 224 return (ENOBUFS); 225 inp->inp_ppcb = up; 226 return (0); 227 } 228 229 void 230 udp_discardcb(struct udpcb *up) 231 { 232 233 uma_zfree(V_udpcb_zone, up); 234 } 235 236 #ifdef VIMAGE 237 void 238 udp_destroy(void) 239 { 240 241 hashdestroy(V_udbinfo.ipi_hashbase, M_PCB, 242 V_udbinfo.ipi_hashmask); 243 hashdestroy(V_udbinfo.ipi_porthashbase, M_PCB, 244 V_udbinfo.ipi_porthashmask); 245 246 uma_zdestroy(V_udpcb_zone); 247 uma_zdestroy(V_udbinfo.ipi_zone); 248 INP_INFO_LOCK_DESTROY(&V_udbinfo); 249 } 250 #endif 251 252 /* 253 * Subroutine of udp_input(), which appends the provided mbuf chain to the 254 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that 255 * contains the source address. If the socket ends up being an IPv6 socket, 256 * udp_append() will convert to a sockaddr_in6 before passing the address 257 * into the socket code. 258 */ 259 static void 260 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off, 261 struct sockaddr_in *udp_in) 262 { 263 struct sockaddr *append_sa; 264 struct socket *so; 265 struct mbuf *opts = 0; 266 #ifdef INET6 267 struct sockaddr_in6 udp_in6; 268 #endif 269 #ifdef IPSEC 270 #ifdef IPSEC_NAT_T 271 #ifdef INET 272 struct udpcb *up; 273 #endif 274 #endif 275 #endif 276 277 INP_RLOCK_ASSERT(inp); 278 279 #ifdef IPSEC 280 /* Check AH/ESP integrity. */ 281 if (ipsec4_in_reject(n, inp)) { 282 m_freem(n); 283 V_ipsec4stat.in_polvio++; 284 return; 285 } 286 #ifdef IPSEC_NAT_T 287 #ifdef INET 288 up = intoudpcb(inp); 289 KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); 290 if (up->u_flags & UF_ESPINUDP_ALL) { /* IPSec UDP encaps. */ 291 n = udp4_espdecap(inp, n, off); 292 if (n == NULL) /* Consumed. */ 293 return; 294 } 295 #endif /* INET */ 296 #endif /* IPSEC_NAT_T */ 297 #endif /* IPSEC */ 298 #ifdef MAC 299 if (mac_inpcb_check_deliver(inp, n) != 0) { 300 m_freem(n); 301 return; 302 } 303 #endif 304 if (inp->inp_flags & INP_CONTROLOPTS || 305 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { 306 #ifdef INET6 307 if (inp->inp_vflag & INP_IPV6) 308 (void)ip6_savecontrol_v4(inp, n, &opts, NULL); 309 else 310 #endif 311 ip_savecontrol(inp, &opts, ip, n); 312 } 313 #ifdef INET6 314 if (inp->inp_vflag & INP_IPV6) { 315 bzero(&udp_in6, sizeof(udp_in6)); 316 udp_in6.sin6_len = sizeof(udp_in6); 317 udp_in6.sin6_family = AF_INET6; 318 in6_sin_2_v4mapsin6(udp_in, &udp_in6); 319 append_sa = (struct sockaddr *)&udp_in6; 320 } else 321 #endif 322 append_sa = (struct sockaddr *)udp_in; 323 m_adj(n, off); 324 325 so = inp->inp_socket; 326 SOCKBUF_LOCK(&so->so_rcv); 327 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { 328 SOCKBUF_UNLOCK(&so->so_rcv); 329 m_freem(n); 330 if (opts) 331 m_freem(opts); 332 UDPSTAT_INC(udps_fullsock); 333 } else 334 sorwakeup_locked(so); 335 } 336 337 void 338 udp_input(struct mbuf *m, int off) 339 { 340 int iphlen = off; 341 struct ip *ip; 342 struct udphdr *uh; 343 struct ifnet *ifp; 344 struct inpcb *inp; 345 struct udpcb *up; 346 int len; 347 struct ip save_ip; 348 struct sockaddr_in udp_in; 349 #ifdef IPFIREWALL_FORWARD 350 struct m_tag *fwd_tag; 351 #endif 352 353 ifp = m->m_pkthdr.rcvif; 354 UDPSTAT_INC(udps_ipackets); 355 356 /* 357 * Strip IP options, if any; should skip this, make available to 358 * user, and use on returned packets, but we don't yet have a way to 359 * check the checksum with options still present. 360 */ 361 if (iphlen > sizeof (struct ip)) { 362 ip_stripoptions(m, (struct mbuf *)0); 363 iphlen = sizeof(struct ip); 364 } 365 366 /* 367 * Get IP and UDP header together in first mbuf. 368 */ 369 ip = mtod(m, struct ip *); 370 if (m->m_len < iphlen + sizeof(struct udphdr)) { 371 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { 372 UDPSTAT_INC(udps_hdrops); 373 return; 374 } 375 ip = mtod(m, struct ip *); 376 } 377 uh = (struct udphdr *)((caddr_t)ip + iphlen); 378 379 /* 380 * Destination port of 0 is illegal, based on RFC768. 381 */ 382 if (uh->uh_dport == 0) 383 goto badunlocked; 384 385 /* 386 * Construct sockaddr format source address. Stuff source address 387 * and datagram in user buffer. 388 */ 389 bzero(&udp_in, sizeof(udp_in)); 390 udp_in.sin_len = sizeof(udp_in); 391 udp_in.sin_family = AF_INET; 392 udp_in.sin_port = uh->uh_sport; 393 udp_in.sin_addr = ip->ip_src; 394 395 /* 396 * Make mbuf data length reflect UDP length. If not enough data to 397 * reflect UDP length, drop. 398 */ 399 len = ntohs((u_short)uh->uh_ulen); 400 if (ip->ip_len != len) { 401 if (len > ip->ip_len || len < sizeof(struct udphdr)) { 402 UDPSTAT_INC(udps_badlen); 403 goto badunlocked; 404 } 405 m_adj(m, len - ip->ip_len); 406 /* ip->ip_len = len; */ 407 } 408 409 /* 410 * Save a copy of the IP header in case we want restore it for 411 * sending an ICMP error message in response. 412 */ 413 if (!V_udp_blackhole) 414 save_ip = *ip; 415 else 416 memset(&save_ip, 0, sizeof(save_ip)); 417 418 /* 419 * Checksum extended UDP header and data. 420 */ 421 if (uh->uh_sum) { 422 u_short uh_sum; 423 424 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 425 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 426 uh_sum = m->m_pkthdr.csum_data; 427 else 428 uh_sum = in_pseudo(ip->ip_src.s_addr, 429 ip->ip_dst.s_addr, htonl((u_short)len + 430 m->m_pkthdr.csum_data + IPPROTO_UDP)); 431 uh_sum ^= 0xffff; 432 } else { 433 char b[9]; 434 435 bcopy(((struct ipovly *)ip)->ih_x1, b, 9); 436 bzero(((struct ipovly *)ip)->ih_x1, 9); 437 ((struct ipovly *)ip)->ih_len = uh->uh_ulen; 438 uh_sum = in_cksum(m, len + sizeof (struct ip)); 439 bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); 440 } 441 if (uh_sum) { 442 UDPSTAT_INC(udps_badsum); 443 m_freem(m); 444 return; 445 } 446 } else 447 UDPSTAT_INC(udps_nosum); 448 449 #ifdef IPFIREWALL_FORWARD 450 /* 451 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. 452 */ 453 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 454 if (fwd_tag != NULL) { 455 struct sockaddr_in *next_hop; 456 457 /* 458 * Do the hack. 459 */ 460 next_hop = (struct sockaddr_in *)(fwd_tag + 1); 461 ip->ip_dst = next_hop->sin_addr; 462 uh->uh_dport = ntohs(next_hop->sin_port); 463 464 /* 465 * Remove the tag from the packet. We don't need it anymore. 466 */ 467 m_tag_delete(m, fwd_tag); 468 } 469 #endif 470 471 INP_INFO_RLOCK(&V_udbinfo); 472 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || 473 in_broadcast(ip->ip_dst, ifp)) { 474 struct inpcb *last; 475 struct ip_moptions *imo; 476 477 last = NULL; 478 LIST_FOREACH(inp, &V_udb, inp_list) { 479 if (inp->inp_lport != uh->uh_dport) 480 continue; 481 #ifdef INET6 482 if ((inp->inp_vflag & INP_IPV4) == 0) 483 continue; 484 #endif 485 if (inp->inp_laddr.s_addr != INADDR_ANY && 486 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 487 continue; 488 if (inp->inp_faddr.s_addr != INADDR_ANY && 489 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 490 continue; 491 if (inp->inp_fport != 0 && 492 inp->inp_fport != uh->uh_sport) 493 continue; 494 495 INP_RLOCK(inp); 496 497 /* 498 * Handle socket delivery policy for any-source 499 * and source-specific multicast. [RFC3678] 500 */ 501 imo = inp->inp_moptions; 502 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 503 imo != NULL) { 504 struct sockaddr_in group; 505 int blocked; 506 507 bzero(&group, sizeof(struct sockaddr_in)); 508 group.sin_len = sizeof(struct sockaddr_in); 509 group.sin_family = AF_INET; 510 group.sin_addr = ip->ip_dst; 511 512 blocked = imo_multi_filter(imo, ifp, 513 (struct sockaddr *)&group, 514 (struct sockaddr *)&udp_in); 515 if (blocked != MCAST_PASS) { 516 if (blocked == MCAST_NOTGMEMBER) 517 IPSTAT_INC(ips_notmember); 518 if (blocked == MCAST_NOTSMEMBER || 519 blocked == MCAST_MUTED) 520 UDPSTAT_INC(udps_filtermcast); 521 INP_RUNLOCK(inp); 522 continue; 523 } 524 } 525 if (last != NULL) { 526 struct mbuf *n; 527 528 n = m_copy(m, 0, M_COPYALL); 529 up = intoudpcb(last); 530 if (up->u_tun_func == NULL) { 531 if (n != NULL) 532 udp_append(last, 533 ip, n, 534 iphlen + 535 sizeof(struct udphdr), 536 &udp_in); 537 } else { 538 /* 539 * Engage the tunneling protocol we 540 * will have to leave the info_lock 541 * up, since we are hunting through 542 * multiple UDP's. 543 */ 544 545 (*up->u_tun_func)(n, iphlen, last); 546 } 547 INP_RUNLOCK(last); 548 } 549 last = inp; 550 /* 551 * Don't look for additional matches if this one does 552 * not have either the SO_REUSEPORT or SO_REUSEADDR 553 * socket options set. This heuristic avoids 554 * searching through all pcbs in the common case of a 555 * non-shared port. It assumes that an application 556 * will never clear these options after setting them. 557 */ 558 if ((last->inp_socket->so_options & 559 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 560 break; 561 } 562 563 if (last == NULL) { 564 /* 565 * No matching pcb found; discard datagram. (No need 566 * to send an ICMP Port Unreachable for a broadcast 567 * or multicast datgram.) 568 */ 569 UDPSTAT_INC(udps_noportbcast); 570 goto badheadlocked; 571 } 572 up = intoudpcb(last); 573 if (up->u_tun_func == NULL) { 574 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 575 &udp_in); 576 } else { 577 /* 578 * Engage the tunneling protocol. 579 */ 580 (*up->u_tun_func)(m, iphlen, last); 581 } 582 INP_RUNLOCK(last); 583 INP_INFO_RUNLOCK(&V_udbinfo); 584 return; 585 } 586 587 /* 588 * Locate pcb for datagram. 589 */ 590 inp = in_pcblookup_hash(&V_udbinfo, ip->ip_src, uh->uh_sport, 591 ip->ip_dst, uh->uh_dport, 1, ifp); 592 if (inp == NULL) { 593 if (udp_log_in_vain) { 594 char buf[4*sizeof "123"]; 595 596 strcpy(buf, inet_ntoa(ip->ip_dst)); 597 log(LOG_INFO, 598 "Connection attempt to UDP %s:%d from %s:%d\n", 599 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 600 ntohs(uh->uh_sport)); 601 } 602 UDPSTAT_INC(udps_noport); 603 if (m->m_flags & (M_BCAST | M_MCAST)) { 604 UDPSTAT_INC(udps_noportbcast); 605 goto badheadlocked; 606 } 607 if (V_udp_blackhole) 608 goto badheadlocked; 609 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 610 goto badheadlocked; 611 *ip = save_ip; 612 ip->ip_len += iphlen; 613 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 614 INP_INFO_RUNLOCK(&V_udbinfo); 615 return; 616 } 617 618 /* 619 * Check the minimum TTL for socket. 620 */ 621 INP_RLOCK(inp); 622 INP_INFO_RUNLOCK(&V_udbinfo); 623 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 624 INP_RUNLOCK(inp); 625 goto badunlocked; 626 } 627 up = intoudpcb(inp); 628 if (up->u_tun_func == NULL) { 629 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 630 } else { 631 /* 632 * Engage the tunneling protocol. 633 */ 634 635 (*up->u_tun_func)(m, iphlen, inp); 636 } 637 INP_RUNLOCK(inp); 638 return; 639 640 badheadlocked: 641 if (inp) 642 INP_RUNLOCK(inp); 643 INP_INFO_RUNLOCK(&V_udbinfo); 644 badunlocked: 645 m_freem(m); 646 } 647 648 /* 649 * Notify a udp user of an asynchronous error; just wake up so that they can 650 * collect error status. 651 */ 652 struct inpcb * 653 udp_notify(struct inpcb *inp, int errno) 654 { 655 656 /* 657 * While udp_ctlinput() always calls udp_notify() with a read lock 658 * when invoking it directly, in_pcbnotifyall() currently uses write 659 * locks due to sharing code with TCP. For now, accept either a read 660 * or a write lock, but a read lock is sufficient. 661 */ 662 INP_LOCK_ASSERT(inp); 663 664 inp->inp_socket->so_error = errno; 665 sorwakeup(inp->inp_socket); 666 sowwakeup(inp->inp_socket); 667 return (inp); 668 } 669 670 void 671 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 672 { 673 struct ip *ip = vip; 674 struct udphdr *uh; 675 struct in_addr faddr; 676 struct inpcb *inp; 677 678 faddr = ((struct sockaddr_in *)sa)->sin_addr; 679 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 680 return; 681 682 /* 683 * Redirects don't need to be handled up here. 684 */ 685 if (PRC_IS_REDIRECT(cmd)) 686 return; 687 688 /* 689 * Hostdead is ugly because it goes linearly through all PCBs. 690 * 691 * XXX: We never get this from ICMP, otherwise it makes an excellent 692 * DoS attack on machines with many connections. 693 */ 694 if (cmd == PRC_HOSTDEAD) 695 ip = NULL; 696 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 697 return; 698 if (ip != NULL) { 699 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 700 INP_INFO_RLOCK(&V_udbinfo); 701 inp = in_pcblookup_hash(&V_udbinfo, faddr, uh->uh_dport, 702 ip->ip_src, uh->uh_sport, 0, NULL); 703 if (inp != NULL) { 704 INP_RLOCK(inp); 705 if (inp->inp_socket != NULL) { 706 udp_notify(inp, inetctlerrmap[cmd]); 707 } 708 INP_RUNLOCK(inp); 709 } 710 INP_INFO_RUNLOCK(&V_udbinfo); 711 } else 712 in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd], 713 udp_notify); 714 } 715 716 static int 717 udp_pcblist(SYSCTL_HANDLER_ARGS) 718 { 719 int error, i, n; 720 struct inpcb *inp, **inp_list; 721 inp_gen_t gencnt; 722 struct xinpgen xig; 723 724 /* 725 * The process of preparing the PCB list is too time-consuming and 726 * resource-intensive to repeat twice on every request. 727 */ 728 if (req->oldptr == 0) { 729 n = V_udbinfo.ipi_count; 730 n += imax(n / 8, 10); 731 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 732 return (0); 733 } 734 735 if (req->newptr != 0) 736 return (EPERM); 737 738 /* 739 * OK, now we're committed to doing something. 740 */ 741 INP_INFO_RLOCK(&V_udbinfo); 742 gencnt = V_udbinfo.ipi_gencnt; 743 n = V_udbinfo.ipi_count; 744 INP_INFO_RUNLOCK(&V_udbinfo); 745 746 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 747 + n * sizeof(struct xinpcb)); 748 if (error != 0) 749 return (error); 750 751 xig.xig_len = sizeof xig; 752 xig.xig_count = n; 753 xig.xig_gen = gencnt; 754 xig.xig_sogen = so_gencnt; 755 error = SYSCTL_OUT(req, &xig, sizeof xig); 756 if (error) 757 return (error); 758 759 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 760 if (inp_list == 0) 761 return (ENOMEM); 762 763 INP_INFO_RLOCK(&V_udbinfo); 764 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; 765 inp = LIST_NEXT(inp, inp_list)) { 766 INP_WLOCK(inp); 767 if (inp->inp_gencnt <= gencnt && 768 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 769 in_pcbref(inp); 770 inp_list[i++] = inp; 771 } 772 INP_WUNLOCK(inp); 773 } 774 INP_INFO_RUNLOCK(&V_udbinfo); 775 n = i; 776 777 error = 0; 778 for (i = 0; i < n; i++) { 779 inp = inp_list[i]; 780 INP_RLOCK(inp); 781 if (inp->inp_gencnt <= gencnt) { 782 struct xinpcb xi; 783 784 bzero(&xi, sizeof(xi)); 785 xi.xi_len = sizeof xi; 786 /* XXX should avoid extra copy */ 787 bcopy(inp, &xi.xi_inp, sizeof *inp); 788 if (inp->inp_socket) 789 sotoxsocket(inp->inp_socket, &xi.xi_socket); 790 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 791 INP_RUNLOCK(inp); 792 error = SYSCTL_OUT(req, &xi, sizeof xi); 793 } else 794 INP_RUNLOCK(inp); 795 } 796 INP_INFO_WLOCK(&V_udbinfo); 797 for (i = 0; i < n; i++) { 798 inp = inp_list[i]; 799 INP_WLOCK(inp); 800 if (!in_pcbrele(inp)) 801 INP_WUNLOCK(inp); 802 } 803 INP_INFO_WUNLOCK(&V_udbinfo); 804 805 if (!error) { 806 /* 807 * Give the user an updated idea of our state. If the 808 * generation differs from what we told her before, she knows 809 * that something happened while we were processing this 810 * request, and it might be necessary to retry. 811 */ 812 INP_INFO_RLOCK(&V_udbinfo); 813 xig.xig_gen = V_udbinfo.ipi_gencnt; 814 xig.xig_sogen = so_gencnt; 815 xig.xig_count = V_udbinfo.ipi_count; 816 INP_INFO_RUNLOCK(&V_udbinfo); 817 error = SYSCTL_OUT(req, &xig, sizeof xig); 818 } 819 free(inp_list, M_TEMP); 820 return (error); 821 } 822 823 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, 824 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 825 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 826 827 static int 828 udp_getcred(SYSCTL_HANDLER_ARGS) 829 { 830 struct xucred xuc; 831 struct sockaddr_in addrs[2]; 832 struct inpcb *inp; 833 int error; 834 835 error = priv_check(req->td, PRIV_NETINET_GETCRED); 836 if (error) 837 return (error); 838 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 839 if (error) 840 return (error); 841 INP_INFO_RLOCK(&V_udbinfo); 842 inp = in_pcblookup_hash(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 843 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 844 if (inp != NULL) { 845 INP_RLOCK(inp); 846 INP_INFO_RUNLOCK(&V_udbinfo); 847 if (inp->inp_socket == NULL) 848 error = ENOENT; 849 if (error == 0) 850 error = cr_canseeinpcb(req->td->td_ucred, inp); 851 if (error == 0) 852 cru2x(inp->inp_cred, &xuc); 853 INP_RUNLOCK(inp); 854 } else { 855 INP_INFO_RUNLOCK(&V_udbinfo); 856 error = ENOENT; 857 } 858 if (error == 0) 859 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 860 return (error); 861 } 862 863 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 864 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 865 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 866 867 int 868 udp_ctloutput(struct socket *so, struct sockopt *sopt) 869 { 870 int error = 0, optval; 871 struct inpcb *inp; 872 #ifdef IPSEC_NAT_T 873 struct udpcb *up; 874 #endif 875 876 inp = sotoinpcb(so); 877 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 878 INP_WLOCK(inp); 879 if (sopt->sopt_level != IPPROTO_UDP) { 880 #ifdef INET6 881 if (INP_CHECK_SOCKAF(so, AF_INET6)) { 882 INP_WUNLOCK(inp); 883 error = ip6_ctloutput(so, sopt); 884 } else { 885 #endif 886 INP_WUNLOCK(inp); 887 error = ip_ctloutput(so, sopt); 888 #ifdef INET6 889 } 890 #endif 891 return (error); 892 } 893 894 switch (sopt->sopt_dir) { 895 case SOPT_SET: 896 switch (sopt->sopt_name) { 897 case UDP_ENCAP: 898 INP_WUNLOCK(inp); 899 error = sooptcopyin(sopt, &optval, sizeof optval, 900 sizeof optval); 901 if (error) 902 break; 903 inp = sotoinpcb(so); 904 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 905 INP_WLOCK(inp); 906 #ifdef IPSEC_NAT_T 907 up = intoudpcb(inp); 908 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 909 #endif 910 switch (optval) { 911 case 0: 912 /* Clear all UDP encap. */ 913 #ifdef IPSEC_NAT_T 914 up->u_flags &= ~UF_ESPINUDP_ALL; 915 #endif 916 break; 917 #ifdef IPSEC_NAT_T 918 case UDP_ENCAP_ESPINUDP: 919 case UDP_ENCAP_ESPINUDP_NON_IKE: 920 up->u_flags &= ~UF_ESPINUDP_ALL; 921 if (optval == UDP_ENCAP_ESPINUDP) 922 up->u_flags |= UF_ESPINUDP; 923 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE) 924 up->u_flags |= UF_ESPINUDP_NON_IKE; 925 break; 926 #endif 927 default: 928 error = EINVAL; 929 break; 930 } 931 INP_WUNLOCK(inp); 932 break; 933 default: 934 INP_WUNLOCK(inp); 935 error = ENOPROTOOPT; 936 break; 937 } 938 break; 939 case SOPT_GET: 940 switch (sopt->sopt_name) { 941 #ifdef IPSEC_NAT_T 942 case UDP_ENCAP: 943 up = intoudpcb(inp); 944 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 945 optval = up->u_flags & UF_ESPINUDP_ALL; 946 INP_WUNLOCK(inp); 947 error = sooptcopyout(sopt, &optval, sizeof optval); 948 break; 949 #endif 950 default: 951 INP_WUNLOCK(inp); 952 error = ENOPROTOOPT; 953 break; 954 } 955 break; 956 } 957 return (error); 958 } 959 960 static int 961 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 962 struct mbuf *control, struct thread *td) 963 { 964 struct udpiphdr *ui; 965 int len = m->m_pkthdr.len; 966 struct in_addr faddr, laddr; 967 struct cmsghdr *cm; 968 struct sockaddr_in *sin, src; 969 int error = 0; 970 int ipflags; 971 u_short fport, lport; 972 int unlock_udbinfo; 973 974 /* 975 * udp_output() may need to temporarily bind or connect the current 976 * inpcb. As such, we don't know up front whether we will need the 977 * pcbinfo lock or not. Do any work to decide what is needed up 978 * front before acquiring any locks. 979 */ 980 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 981 if (control) 982 m_freem(control); 983 m_freem(m); 984 return (EMSGSIZE); 985 } 986 987 src.sin_family = 0; 988 if (control != NULL) { 989 /* 990 * XXX: Currently, we assume all the optional information is 991 * stored in a single mbuf. 992 */ 993 if (control->m_next) { 994 m_freem(control); 995 m_freem(m); 996 return (EINVAL); 997 } 998 for (; control->m_len > 0; 999 control->m_data += CMSG_ALIGN(cm->cmsg_len), 1000 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1001 cm = mtod(control, struct cmsghdr *); 1002 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 1003 || cm->cmsg_len > control->m_len) { 1004 error = EINVAL; 1005 break; 1006 } 1007 if (cm->cmsg_level != IPPROTO_IP) 1008 continue; 1009 1010 switch (cm->cmsg_type) { 1011 case IP_SENDSRCADDR: 1012 if (cm->cmsg_len != 1013 CMSG_LEN(sizeof(struct in_addr))) { 1014 error = EINVAL; 1015 break; 1016 } 1017 bzero(&src, sizeof(src)); 1018 src.sin_family = AF_INET; 1019 src.sin_len = sizeof(src); 1020 src.sin_port = inp->inp_lport; 1021 src.sin_addr = 1022 *(struct in_addr *)CMSG_DATA(cm); 1023 break; 1024 1025 default: 1026 error = ENOPROTOOPT; 1027 break; 1028 } 1029 if (error) 1030 break; 1031 } 1032 m_freem(control); 1033 } 1034 if (error) { 1035 m_freem(m); 1036 return (error); 1037 } 1038 1039 /* 1040 * Depending on whether or not the application has bound or connected 1041 * the socket, we may have to do varying levels of work. The optimal 1042 * case is for a connected UDP socket, as a global lock isn't 1043 * required at all. 1044 * 1045 * In order to decide which we need, we require stability of the 1046 * inpcb binding, which we ensure by acquiring a read lock on the 1047 * inpcb. This doesn't strictly follow the lock order, so we play 1048 * the trylock and retry game; note that we may end up with more 1049 * conservative locks than required the second time around, so later 1050 * assertions have to accept that. Further analysis of the number of 1051 * misses under contention is required. 1052 */ 1053 sin = (struct sockaddr_in *)addr; 1054 INP_RLOCK(inp); 1055 if (sin != NULL && 1056 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 1057 INP_RUNLOCK(inp); 1058 INP_INFO_WLOCK(&V_udbinfo); 1059 INP_WLOCK(inp); 1060 unlock_udbinfo = 2; 1061 } else if ((sin != NULL && ( 1062 (sin->sin_addr.s_addr == INADDR_ANY) || 1063 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 1064 (inp->inp_laddr.s_addr == INADDR_ANY) || 1065 (inp->inp_lport == 0))) || 1066 (src.sin_family == AF_INET)) { 1067 if (!INP_INFO_TRY_RLOCK(&V_udbinfo)) { 1068 INP_RUNLOCK(inp); 1069 INP_INFO_RLOCK(&V_udbinfo); 1070 INP_RLOCK(inp); 1071 } 1072 unlock_udbinfo = 1; 1073 } else 1074 unlock_udbinfo = 0; 1075 1076 /* 1077 * If the IP_SENDSRCADDR control message was specified, override the 1078 * source address for this datagram. Its use is invalidated if the 1079 * address thus specified is incomplete or clobbers other inpcbs. 1080 */ 1081 laddr = inp->inp_laddr; 1082 lport = inp->inp_lport; 1083 if (src.sin_family == AF_INET) { 1084 INP_INFO_LOCK_ASSERT(&V_udbinfo); 1085 if ((lport == 0) || 1086 (laddr.s_addr == INADDR_ANY && 1087 src.sin_addr.s_addr == INADDR_ANY)) { 1088 error = EINVAL; 1089 goto release; 1090 } 1091 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 1092 &laddr.s_addr, &lport, td->td_ucred); 1093 if (error) 1094 goto release; 1095 } 1096 1097 /* 1098 * If a UDP socket has been connected, then a local address/port will 1099 * have been selected and bound. 1100 * 1101 * If a UDP socket has not been connected to, then an explicit 1102 * destination address must be used, in which case a local 1103 * address/port may not have been selected and bound. 1104 */ 1105 if (sin != NULL) { 1106 INP_LOCK_ASSERT(inp); 1107 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1108 error = EISCONN; 1109 goto release; 1110 } 1111 1112 /* 1113 * Jail may rewrite the destination address, so let it do 1114 * that before we use it. 1115 */ 1116 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1117 if (error) 1118 goto release; 1119 1120 /* 1121 * If a local address or port hasn't yet been selected, or if 1122 * the destination address needs to be rewritten due to using 1123 * a special INADDR_ constant, invoke in_pcbconnect_setup() 1124 * to do the heavy lifting. Once a port is selected, we 1125 * commit the binding back to the socket; we also commit the 1126 * binding of the address if in jail. 1127 * 1128 * If we already have a valid binding and we're not 1129 * requesting a destination address rewrite, use a fast path. 1130 */ 1131 if (inp->inp_laddr.s_addr == INADDR_ANY || 1132 inp->inp_lport == 0 || 1133 sin->sin_addr.s_addr == INADDR_ANY || 1134 sin->sin_addr.s_addr == INADDR_BROADCAST) { 1135 INP_INFO_LOCK_ASSERT(&V_udbinfo); 1136 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 1137 &lport, &faddr.s_addr, &fport, NULL, 1138 td->td_ucred); 1139 if (error) 1140 goto release; 1141 1142 /* 1143 * XXXRW: Why not commit the port if the address is 1144 * !INADDR_ANY? 1145 */ 1146 /* Commit the local port if newly assigned. */ 1147 if (inp->inp_laddr.s_addr == INADDR_ANY && 1148 inp->inp_lport == 0) { 1149 INP_INFO_WLOCK_ASSERT(&V_udbinfo); 1150 INP_WLOCK_ASSERT(inp); 1151 /* 1152 * Remember addr if jailed, to prevent 1153 * rebinding. 1154 */ 1155 if (prison_flag(td->td_ucred, PR_IP4)) 1156 inp->inp_laddr = laddr; 1157 inp->inp_lport = lport; 1158 if (in_pcbinshash(inp) != 0) { 1159 inp->inp_lport = 0; 1160 error = EAGAIN; 1161 goto release; 1162 } 1163 inp->inp_flags |= INP_ANONPORT; 1164 } 1165 } else { 1166 faddr = sin->sin_addr; 1167 fport = sin->sin_port; 1168 } 1169 } else { 1170 INP_LOCK_ASSERT(inp); 1171 faddr = inp->inp_faddr; 1172 fport = inp->inp_fport; 1173 if (faddr.s_addr == INADDR_ANY) { 1174 error = ENOTCONN; 1175 goto release; 1176 } 1177 } 1178 1179 /* 1180 * Calculate data length and get a mbuf for UDP, IP, and possible 1181 * link-layer headers. Immediate slide the data pointer back forward 1182 * since we won't use that space at this layer. 1183 */ 1184 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 1185 if (m == NULL) { 1186 error = ENOBUFS; 1187 goto release; 1188 } 1189 m->m_data += max_linkhdr; 1190 m->m_len -= max_linkhdr; 1191 m->m_pkthdr.len -= max_linkhdr; 1192 1193 /* 1194 * Fill in mbuf with extended UDP header and addresses and length put 1195 * into network format. 1196 */ 1197 ui = mtod(m, struct udpiphdr *); 1198 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1199 ui->ui_pr = IPPROTO_UDP; 1200 ui->ui_src = laddr; 1201 ui->ui_dst = faddr; 1202 ui->ui_sport = lport; 1203 ui->ui_dport = fport; 1204 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1205 1206 /* 1207 * Set the Don't Fragment bit in the IP header. 1208 */ 1209 if (inp->inp_flags & INP_DONTFRAG) { 1210 struct ip *ip; 1211 1212 ip = (struct ip *)&ui->ui_i; 1213 ip->ip_off |= IP_DF; 1214 } 1215 1216 ipflags = 0; 1217 if (inp->inp_socket->so_options & SO_DONTROUTE) 1218 ipflags |= IP_ROUTETOIF; 1219 if (inp->inp_socket->so_options & SO_BROADCAST) 1220 ipflags |= IP_ALLOWBROADCAST; 1221 if (inp->inp_flags & INP_ONESBCAST) 1222 ipflags |= IP_SENDONES; 1223 1224 #ifdef MAC 1225 mac_inpcb_create_mbuf(inp, m); 1226 #endif 1227 1228 /* 1229 * Set up checksum and output datagram. 1230 */ 1231 if (udp_cksum) { 1232 if (inp->inp_flags & INP_ONESBCAST) 1233 faddr.s_addr = INADDR_BROADCAST; 1234 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1235 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 1236 m->m_pkthdr.csum_flags = CSUM_UDP; 1237 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1238 } else 1239 ui->ui_sum = 0; 1240 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 1241 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1242 ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ 1243 UDPSTAT_INC(udps_opackets); 1244 1245 if (unlock_udbinfo == 2) 1246 INP_INFO_WUNLOCK(&V_udbinfo); 1247 else if (unlock_udbinfo == 1) 1248 INP_INFO_RUNLOCK(&V_udbinfo); 1249 error = ip_output(m, inp->inp_options, NULL, ipflags, 1250 inp->inp_moptions, inp); 1251 if (unlock_udbinfo == 2) 1252 INP_WUNLOCK(inp); 1253 else 1254 INP_RUNLOCK(inp); 1255 return (error); 1256 1257 release: 1258 if (unlock_udbinfo == 2) { 1259 INP_WUNLOCK(inp); 1260 INP_INFO_WUNLOCK(&V_udbinfo); 1261 } else if (unlock_udbinfo == 1) { 1262 INP_RUNLOCK(inp); 1263 INP_INFO_RUNLOCK(&V_udbinfo); 1264 } else 1265 INP_RUNLOCK(inp); 1266 m_freem(m); 1267 return (error); 1268 } 1269 1270 1271 #if defined(IPSEC) && defined(IPSEC_NAT_T) 1272 #ifdef INET 1273 /* 1274 * Potentially decap ESP in UDP frame. Check for an ESP header 1275 * and optional marker; if present, strip the UDP header and 1276 * push the result through IPSec. 1277 * 1278 * Returns mbuf to be processed (potentially re-allocated) or 1279 * NULL if consumed and/or processed. 1280 */ 1281 static struct mbuf * 1282 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off) 1283 { 1284 size_t minlen, payload, skip, iphlen; 1285 caddr_t data; 1286 struct udpcb *up; 1287 struct m_tag *tag; 1288 struct udphdr *udphdr; 1289 struct ip *ip; 1290 1291 INP_RLOCK_ASSERT(inp); 1292 1293 /* 1294 * Pull up data so the longest case is contiguous: 1295 * IP/UDP hdr + non ESP marker + ESP hdr. 1296 */ 1297 minlen = off + sizeof(uint64_t) + sizeof(struct esp); 1298 if (minlen > m->m_pkthdr.len) 1299 minlen = m->m_pkthdr.len; 1300 if ((m = m_pullup(m, minlen)) == NULL) { 1301 V_ipsec4stat.in_inval++; 1302 return (NULL); /* Bypass caller processing. */ 1303 } 1304 data = mtod(m, caddr_t); /* Points to ip header. */ 1305 payload = m->m_len - off; /* Size of payload. */ 1306 1307 if (payload == 1 && data[off] == '\xff') 1308 return (m); /* NB: keepalive packet, no decap. */ 1309 1310 up = intoudpcb(inp); 1311 KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); 1312 KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0, 1313 ("u_flags 0x%x", up->u_flags)); 1314 1315 /* 1316 * Check that the payload is large enough to hold an 1317 * ESP header and compute the amount of data to remove. 1318 * 1319 * NB: the caller has already done a pullup for us. 1320 * XXX can we assume alignment and eliminate bcopys? 1321 */ 1322 if (up->u_flags & UF_ESPINUDP_NON_IKE) { 1323 /* 1324 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 1325 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring 1326 * possible AH mode non-IKE marker+non-ESP marker 1327 * from draft-ietf-ipsec-udp-encaps-00.txt. 1328 */ 1329 uint64_t marker; 1330 1331 if (payload <= sizeof(uint64_t) + sizeof(struct esp)) 1332 return (m); /* NB: no decap. */ 1333 bcopy(data + off, &marker, sizeof(uint64_t)); 1334 if (marker != 0) /* Non-IKE marker. */ 1335 return (m); /* NB: no decap. */ 1336 skip = sizeof(uint64_t) + sizeof(struct udphdr); 1337 } else { 1338 uint32_t spi; 1339 1340 if (payload <= sizeof(struct esp)) { 1341 V_ipsec4stat.in_inval++; 1342 m_freem(m); 1343 return (NULL); /* Discard. */ 1344 } 1345 bcopy(data + off, &spi, sizeof(uint32_t)); 1346 if (spi == 0) /* Non-ESP marker. */ 1347 return (m); /* NB: no decap. */ 1348 skip = sizeof(struct udphdr); 1349 } 1350 1351 /* 1352 * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1353 * the UDP ports. This is required if we want to select 1354 * the right SPD for multiple hosts behind same NAT. 1355 * 1356 * NB: ports are maintained in network byte order everywhere 1357 * in the NAT-T code. 1358 */ 1359 tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1360 2 * sizeof(uint16_t), M_NOWAIT); 1361 if (tag == NULL) { 1362 V_ipsec4stat.in_nomem++; 1363 m_freem(m); 1364 return (NULL); /* Discard. */ 1365 } 1366 iphlen = off - sizeof(struct udphdr); 1367 udphdr = (struct udphdr *)(data + iphlen); 1368 ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport; 1369 ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport; 1370 m_tag_prepend(m, tag); 1371 1372 /* 1373 * Remove the UDP header (and possibly the non ESP marker) 1374 * IP header length is iphlen 1375 * Before: 1376 * <--- off ---> 1377 * +----+------+-----+ 1378 * | IP | UDP | ESP | 1379 * +----+------+-----+ 1380 * <-skip-> 1381 * After: 1382 * +----+-----+ 1383 * | IP | ESP | 1384 * +----+-----+ 1385 * <-skip-> 1386 */ 1387 ovbcopy(data, data + skip, iphlen); 1388 m_adj(m, skip); 1389 1390 ip = mtod(m, struct ip *); 1391 ip->ip_len -= skip; 1392 ip->ip_p = IPPROTO_ESP; 1393 1394 /* 1395 * We cannot yet update the cksums so clear any 1396 * h/w cksum flags as they are no longer valid. 1397 */ 1398 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) 1399 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 1400 1401 (void) ipsec4_common_input(m, iphlen, ip->ip_p); 1402 return (NULL); /* NB: consumed, bypass processing. */ 1403 } 1404 #endif /* INET */ 1405 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */ 1406 1407 static void 1408 udp_abort(struct socket *so) 1409 { 1410 struct inpcb *inp; 1411 1412 inp = sotoinpcb(so); 1413 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1414 INP_INFO_WLOCK(&V_udbinfo); 1415 INP_WLOCK(inp); 1416 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1417 in_pcbdisconnect(inp); 1418 inp->inp_laddr.s_addr = INADDR_ANY; 1419 soisdisconnected(so); 1420 } 1421 INP_WUNLOCK(inp); 1422 INP_INFO_WUNLOCK(&V_udbinfo); 1423 } 1424 1425 static int 1426 udp_attach(struct socket *so, int proto, struct thread *td) 1427 { 1428 struct inpcb *inp; 1429 int error; 1430 1431 inp = sotoinpcb(so); 1432 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1433 error = soreserve(so, udp_sendspace, udp_recvspace); 1434 if (error) 1435 return (error); 1436 INP_INFO_WLOCK(&V_udbinfo); 1437 error = in_pcballoc(so, &V_udbinfo); 1438 if (error) { 1439 INP_INFO_WUNLOCK(&V_udbinfo); 1440 return (error); 1441 } 1442 1443 inp = sotoinpcb(so); 1444 inp->inp_vflag |= INP_IPV4; 1445 inp->inp_ip_ttl = V_ip_defttl; 1446 1447 error = udp_newudpcb(inp); 1448 if (error) { 1449 in_pcbdetach(inp); 1450 in_pcbfree(inp); 1451 INP_INFO_WUNLOCK(&V_udbinfo); 1452 return (error); 1453 } 1454 1455 INP_WUNLOCK(inp); 1456 INP_INFO_WUNLOCK(&V_udbinfo); 1457 return (0); 1458 } 1459 1460 int 1461 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f) 1462 { 1463 struct inpcb *inp; 1464 struct udpcb *up; 1465 1466 KASSERT(so->so_type == SOCK_DGRAM, 1467 ("udp_set_kernel_tunneling: !dgram")); 1468 inp = sotoinpcb(so); 1469 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL")); 1470 INP_WLOCK(inp); 1471 up = intoudpcb(inp); 1472 if (up->u_tun_func != NULL) { 1473 INP_WUNLOCK(inp); 1474 return (EBUSY); 1475 } 1476 up->u_tun_func = f; 1477 INP_WUNLOCK(inp); 1478 return (0); 1479 } 1480 1481 static int 1482 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1483 { 1484 struct inpcb *inp; 1485 int error; 1486 1487 inp = sotoinpcb(so); 1488 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1489 INP_INFO_WLOCK(&V_udbinfo); 1490 INP_WLOCK(inp); 1491 error = in_pcbbind(inp, nam, td->td_ucred); 1492 INP_WUNLOCK(inp); 1493 INP_INFO_WUNLOCK(&V_udbinfo); 1494 return (error); 1495 } 1496 1497 static void 1498 udp_close(struct socket *so) 1499 { 1500 struct inpcb *inp; 1501 1502 inp = sotoinpcb(so); 1503 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1504 INP_INFO_WLOCK(&V_udbinfo); 1505 INP_WLOCK(inp); 1506 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1507 in_pcbdisconnect(inp); 1508 inp->inp_laddr.s_addr = INADDR_ANY; 1509 soisdisconnected(so); 1510 } 1511 INP_WUNLOCK(inp); 1512 INP_INFO_WUNLOCK(&V_udbinfo); 1513 } 1514 1515 static int 1516 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1517 { 1518 struct inpcb *inp; 1519 int error; 1520 struct sockaddr_in *sin; 1521 1522 inp = sotoinpcb(so); 1523 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1524 INP_INFO_WLOCK(&V_udbinfo); 1525 INP_WLOCK(inp); 1526 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1527 INP_WUNLOCK(inp); 1528 INP_INFO_WUNLOCK(&V_udbinfo); 1529 return (EISCONN); 1530 } 1531 sin = (struct sockaddr_in *)nam; 1532 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1533 if (error != 0) { 1534 INP_WUNLOCK(inp); 1535 INP_INFO_WUNLOCK(&V_udbinfo); 1536 return (error); 1537 } 1538 error = in_pcbconnect(inp, nam, td->td_ucred); 1539 if (error == 0) 1540 soisconnected(so); 1541 INP_WUNLOCK(inp); 1542 INP_INFO_WUNLOCK(&V_udbinfo); 1543 return (error); 1544 } 1545 1546 static void 1547 udp_detach(struct socket *so) 1548 { 1549 struct inpcb *inp; 1550 struct udpcb *up; 1551 1552 inp = sotoinpcb(so); 1553 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1554 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1555 ("udp_detach: not disconnected")); 1556 INP_INFO_WLOCK(&V_udbinfo); 1557 INP_WLOCK(inp); 1558 up = intoudpcb(inp); 1559 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1560 inp->inp_ppcb = NULL; 1561 in_pcbdetach(inp); 1562 in_pcbfree(inp); 1563 INP_INFO_WUNLOCK(&V_udbinfo); 1564 udp_discardcb(up); 1565 } 1566 1567 static int 1568 udp_disconnect(struct socket *so) 1569 { 1570 struct inpcb *inp; 1571 1572 inp = sotoinpcb(so); 1573 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1574 INP_INFO_WLOCK(&V_udbinfo); 1575 INP_WLOCK(inp); 1576 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1577 INP_WUNLOCK(inp); 1578 INP_INFO_WUNLOCK(&V_udbinfo); 1579 return (ENOTCONN); 1580 } 1581 1582 in_pcbdisconnect(inp); 1583 inp->inp_laddr.s_addr = INADDR_ANY; 1584 SOCK_LOCK(so); 1585 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1586 SOCK_UNLOCK(so); 1587 INP_WUNLOCK(inp); 1588 INP_INFO_WUNLOCK(&V_udbinfo); 1589 return (0); 1590 } 1591 1592 static int 1593 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1594 struct mbuf *control, struct thread *td) 1595 { 1596 struct inpcb *inp; 1597 1598 inp = sotoinpcb(so); 1599 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1600 return (udp_output(inp, m, addr, control, td)); 1601 } 1602 1603 int 1604 udp_shutdown(struct socket *so) 1605 { 1606 struct inpcb *inp; 1607 1608 inp = sotoinpcb(so); 1609 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1610 INP_WLOCK(inp); 1611 socantsendmore(so); 1612 INP_WUNLOCK(inp); 1613 return (0); 1614 } 1615 1616 struct pr_usrreqs udp_usrreqs = { 1617 .pru_abort = udp_abort, 1618 .pru_attach = udp_attach, 1619 .pru_bind = udp_bind, 1620 .pru_connect = udp_connect, 1621 .pru_control = in_control, 1622 .pru_detach = udp_detach, 1623 .pru_disconnect = udp_disconnect, 1624 .pru_peeraddr = in_getpeeraddr, 1625 .pru_send = udp_send, 1626 .pru_soreceive = soreceive_dgram, 1627 .pru_sosend = sosend_dgram, 1628 .pru_shutdown = udp_shutdown, 1629 .pru_sockaddr = in_getsockaddr, 1630 .pru_sosetlabel = in_pcbsosetlabel, 1631 .pru_close = udp_close, 1632 };
Cache object: 781c16304b64f2e067fec1ef86ed9b60
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