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/8.4/sys/netinet/udp_usrreq.c 249660 2013-04-19 21:08:56Z rwatson $"); 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 VNET_DEFINE(int, udp_cksum) = 1; 104 SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, 105 &VNET_NAME(udp_cksum), 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 * Detached PCBs can linger in the list if someone 499 * holds a reference. (e.g. udp_pcblist) 500 */ 501 if (inp->inp_socket == NULL) { 502 INP_RUNLOCK(inp); 503 continue; 504 } 505 506 /* 507 * Handle socket delivery policy for any-source 508 * and source-specific multicast. [RFC3678] 509 */ 510 imo = inp->inp_moptions; 511 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 512 imo != NULL) { 513 struct sockaddr_in group; 514 int blocked; 515 516 bzero(&group, sizeof(struct sockaddr_in)); 517 group.sin_len = sizeof(struct sockaddr_in); 518 group.sin_family = AF_INET; 519 group.sin_addr = ip->ip_dst; 520 521 blocked = imo_multi_filter(imo, ifp, 522 (struct sockaddr *)&group, 523 (struct sockaddr *)&udp_in); 524 if (blocked != MCAST_PASS) { 525 if (blocked == MCAST_NOTGMEMBER) 526 IPSTAT_INC(ips_notmember); 527 if (blocked == MCAST_NOTSMEMBER || 528 blocked == MCAST_MUTED) 529 UDPSTAT_INC(udps_filtermcast); 530 INP_RUNLOCK(inp); 531 continue; 532 } 533 } 534 if (last != NULL) { 535 struct mbuf *n; 536 537 n = m_copy(m, 0, M_COPYALL); 538 up = intoudpcb(last); 539 if (up->u_tun_func == NULL) { 540 if (n != NULL) 541 udp_append(last, 542 ip, n, 543 iphlen + 544 sizeof(struct udphdr), 545 &udp_in); 546 } else { 547 /* 548 * Engage the tunneling protocol we 549 * will have to leave the info_lock 550 * up, since we are hunting through 551 * multiple UDP's. 552 */ 553 554 (*up->u_tun_func)(n, iphlen, last); 555 } 556 INP_RUNLOCK(last); 557 } 558 last = inp; 559 /* 560 * Don't look for additional matches if this one does 561 * not have either the SO_REUSEPORT or SO_REUSEADDR 562 * socket options set. This heuristic avoids 563 * searching through all pcbs in the common case of a 564 * non-shared port. It assumes that an application 565 * will never clear these options after setting them. 566 */ 567 if ((last->inp_socket->so_options & 568 (SO_REUSEPORT|SO_REUSEADDR)) == 0) 569 break; 570 } 571 572 if (last == NULL) { 573 /* 574 * No matching pcb found; discard datagram. (No need 575 * to send an ICMP Port Unreachable for a broadcast 576 * or multicast datgram.) 577 */ 578 UDPSTAT_INC(udps_noportbcast); 579 goto badheadlocked; 580 } 581 up = intoudpcb(last); 582 if (up->u_tun_func == NULL) { 583 udp_append(last, ip, m, iphlen + sizeof(struct udphdr), 584 &udp_in); 585 } else { 586 /* 587 * Engage the tunneling protocol. 588 */ 589 (*up->u_tun_func)(m, iphlen, last); 590 } 591 INP_RUNLOCK(last); 592 INP_INFO_RUNLOCK(&V_udbinfo); 593 return; 594 } 595 596 /* 597 * Locate pcb for datagram. 598 */ 599 inp = in_pcblookup_hash(&V_udbinfo, ip->ip_src, uh->uh_sport, 600 ip->ip_dst, uh->uh_dport, 1, ifp); 601 if (inp == NULL) { 602 if (udp_log_in_vain) { 603 char buf[4*sizeof "123"]; 604 605 strcpy(buf, inet_ntoa(ip->ip_dst)); 606 log(LOG_INFO, 607 "Connection attempt to UDP %s:%d from %s:%d\n", 608 buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), 609 ntohs(uh->uh_sport)); 610 } 611 UDPSTAT_INC(udps_noport); 612 if (m->m_flags & (M_BCAST | M_MCAST)) { 613 UDPSTAT_INC(udps_noportbcast); 614 goto badheadlocked; 615 } 616 if (V_udp_blackhole) 617 goto badheadlocked; 618 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) 619 goto badheadlocked; 620 *ip = save_ip; 621 ip->ip_len += iphlen; 622 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 623 INP_INFO_RUNLOCK(&V_udbinfo); 624 return; 625 } 626 627 /* 628 * Check the minimum TTL for socket. 629 */ 630 INP_RLOCK(inp); 631 INP_INFO_RUNLOCK(&V_udbinfo); 632 633 /* 634 * Detached PCBs can linger in the hash table if someone holds a 635 * reference. (e.g. udp_pcblist) 636 */ 637 if (inp->inp_socket == NULL) { 638 INP_RUNLOCK(inp); 639 goto badunlocked; 640 } 641 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { 642 INP_RUNLOCK(inp); 643 goto badunlocked; 644 } 645 up = intoudpcb(inp); 646 if (up->u_tun_func == NULL) { 647 udp_append(inp, ip, m, iphlen + sizeof(struct udphdr), &udp_in); 648 } else { 649 /* 650 * Engage the tunneling protocol. 651 */ 652 653 (*up->u_tun_func)(m, iphlen, inp); 654 } 655 INP_RUNLOCK(inp); 656 return; 657 658 badheadlocked: 659 if (inp) 660 INP_RUNLOCK(inp); 661 INP_INFO_RUNLOCK(&V_udbinfo); 662 badunlocked: 663 m_freem(m); 664 } 665 666 /* 667 * Notify a udp user of an asynchronous error; just wake up so that they can 668 * collect error status. 669 */ 670 struct inpcb * 671 udp_notify(struct inpcb *inp, int errno) 672 { 673 674 /* 675 * While udp_ctlinput() always calls udp_notify() with a read lock 676 * when invoking it directly, in_pcbnotifyall() currently uses write 677 * locks due to sharing code with TCP. For now, accept either a read 678 * or a write lock, but a read lock is sufficient. 679 */ 680 INP_LOCK_ASSERT(inp); 681 682 inp->inp_socket->so_error = errno; 683 sorwakeup(inp->inp_socket); 684 sowwakeup(inp->inp_socket); 685 return (inp); 686 } 687 688 void 689 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) 690 { 691 struct ip *ip = vip; 692 struct udphdr *uh; 693 struct in_addr faddr; 694 struct inpcb *inp; 695 696 faddr = ((struct sockaddr_in *)sa)->sin_addr; 697 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 698 return; 699 700 /* 701 * Redirects don't need to be handled up here. 702 */ 703 if (PRC_IS_REDIRECT(cmd)) 704 return; 705 706 /* 707 * Hostdead is ugly because it goes linearly through all PCBs. 708 * 709 * XXX: We never get this from ICMP, otherwise it makes an excellent 710 * DoS attack on machines with many connections. 711 */ 712 if (cmd == PRC_HOSTDEAD) 713 ip = NULL; 714 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 715 return; 716 if (ip != NULL) { 717 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 718 INP_INFO_RLOCK(&V_udbinfo); 719 inp = in_pcblookup_hash(&V_udbinfo, faddr, uh->uh_dport, 720 ip->ip_src, uh->uh_sport, 0, NULL); 721 if (inp != NULL) { 722 INP_RLOCK(inp); 723 if (inp->inp_socket != NULL) { 724 udp_notify(inp, inetctlerrmap[cmd]); 725 } 726 INP_RUNLOCK(inp); 727 } 728 INP_INFO_RUNLOCK(&V_udbinfo); 729 } else 730 in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd], 731 udp_notify); 732 } 733 734 static int 735 udp_pcblist(SYSCTL_HANDLER_ARGS) 736 { 737 int error, i, n; 738 struct inpcb *inp, **inp_list; 739 inp_gen_t gencnt; 740 struct xinpgen xig; 741 742 /* 743 * The process of preparing the PCB list is too time-consuming and 744 * resource-intensive to repeat twice on every request. 745 */ 746 if (req->oldptr == 0) { 747 n = V_udbinfo.ipi_count; 748 n += imax(n / 8, 10); 749 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); 750 return (0); 751 } 752 753 if (req->newptr != 0) 754 return (EPERM); 755 756 /* 757 * OK, now we're committed to doing something. 758 */ 759 INP_INFO_RLOCK(&V_udbinfo); 760 gencnt = V_udbinfo.ipi_gencnt; 761 n = V_udbinfo.ipi_count; 762 INP_INFO_RUNLOCK(&V_udbinfo); 763 764 error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) 765 + n * sizeof(struct xinpcb)); 766 if (error != 0) 767 return (error); 768 769 xig.xig_len = sizeof xig; 770 xig.xig_count = n; 771 xig.xig_gen = gencnt; 772 xig.xig_sogen = so_gencnt; 773 error = SYSCTL_OUT(req, &xig, sizeof xig); 774 if (error) 775 return (error); 776 777 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 778 if (inp_list == 0) 779 return (ENOMEM); 780 781 INP_INFO_RLOCK(&V_udbinfo); 782 for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; 783 inp = LIST_NEXT(inp, inp_list)) { 784 INP_WLOCK(inp); 785 if (inp->inp_gencnt <= gencnt && 786 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 787 in_pcbref(inp); 788 inp_list[i++] = inp; 789 } 790 INP_WUNLOCK(inp); 791 } 792 INP_INFO_RUNLOCK(&V_udbinfo); 793 n = i; 794 795 error = 0; 796 for (i = 0; i < n; i++) { 797 inp = inp_list[i]; 798 INP_RLOCK(inp); 799 if (inp->inp_gencnt <= gencnt) { 800 struct xinpcb xi; 801 802 bzero(&xi, sizeof(xi)); 803 xi.xi_len = sizeof xi; 804 /* XXX should avoid extra copy */ 805 bcopy(inp, &xi.xi_inp, sizeof *inp); 806 if (inp->inp_socket) 807 sotoxsocket(inp->inp_socket, &xi.xi_socket); 808 xi.xi_inp.inp_gencnt = inp->inp_gencnt; 809 INP_RUNLOCK(inp); 810 error = SYSCTL_OUT(req, &xi, sizeof xi); 811 } else 812 INP_RUNLOCK(inp); 813 } 814 INP_INFO_WLOCK(&V_udbinfo); 815 for (i = 0; i < n; i++) { 816 inp = inp_list[i]; 817 INP_WLOCK(inp); 818 if (!in_pcbrele(inp)) 819 INP_WUNLOCK(inp); 820 } 821 INP_INFO_WUNLOCK(&V_udbinfo); 822 823 if (!error) { 824 /* 825 * Give the user an updated idea of our state. If the 826 * generation differs from what we told her before, she knows 827 * that something happened while we were processing this 828 * request, and it might be necessary to retry. 829 */ 830 INP_INFO_RLOCK(&V_udbinfo); 831 xig.xig_gen = V_udbinfo.ipi_gencnt; 832 xig.xig_sogen = so_gencnt; 833 xig.xig_count = V_udbinfo.ipi_count; 834 INP_INFO_RUNLOCK(&V_udbinfo); 835 error = SYSCTL_OUT(req, &xig, sizeof xig); 836 } 837 free(inp_list, M_TEMP); 838 return (error); 839 } 840 841 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, 842 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, 843 udp_pcblist, "S,xinpcb", "List of active UDP sockets"); 844 845 static int 846 udp_getcred(SYSCTL_HANDLER_ARGS) 847 { 848 struct xucred xuc; 849 struct sockaddr_in addrs[2]; 850 struct inpcb *inp; 851 int error; 852 853 error = priv_check(req->td, PRIV_NETINET_GETCRED); 854 if (error) 855 return (error); 856 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 857 if (error) 858 return (error); 859 INP_INFO_RLOCK(&V_udbinfo); 860 inp = in_pcblookup_hash(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, 861 addrs[0].sin_addr, addrs[0].sin_port, 1, NULL); 862 if (inp != NULL) { 863 INP_RLOCK(inp); 864 INP_INFO_RUNLOCK(&V_udbinfo); 865 if (inp->inp_socket == NULL) 866 error = ENOENT; 867 if (error == 0) 868 error = cr_canseeinpcb(req->td->td_ucred, inp); 869 if (error == 0) 870 cru2x(inp->inp_cred, &xuc); 871 INP_RUNLOCK(inp); 872 } else { 873 INP_INFO_RUNLOCK(&V_udbinfo); 874 error = ENOENT; 875 } 876 if (error == 0) 877 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 878 return (error); 879 } 880 881 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, 882 CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, 883 udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); 884 885 int 886 udp_ctloutput(struct socket *so, struct sockopt *sopt) 887 { 888 int error = 0, optval; 889 struct inpcb *inp; 890 #ifdef IPSEC_NAT_T 891 struct udpcb *up; 892 #endif 893 894 inp = sotoinpcb(so); 895 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 896 INP_WLOCK(inp); 897 if (sopt->sopt_level != IPPROTO_UDP) { 898 #ifdef INET6 899 if (INP_CHECK_SOCKAF(so, AF_INET6)) { 900 INP_WUNLOCK(inp); 901 error = ip6_ctloutput(so, sopt); 902 } else { 903 #endif 904 INP_WUNLOCK(inp); 905 error = ip_ctloutput(so, sopt); 906 #ifdef INET6 907 } 908 #endif 909 return (error); 910 } 911 912 switch (sopt->sopt_dir) { 913 case SOPT_SET: 914 switch (sopt->sopt_name) { 915 case UDP_ENCAP: 916 INP_WUNLOCK(inp); 917 error = sooptcopyin(sopt, &optval, sizeof optval, 918 sizeof optval); 919 if (error) 920 break; 921 inp = sotoinpcb(so); 922 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 923 INP_WLOCK(inp); 924 #ifdef IPSEC_NAT_T 925 up = intoudpcb(inp); 926 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 927 #endif 928 switch (optval) { 929 case 0: 930 /* Clear all UDP encap. */ 931 #ifdef IPSEC_NAT_T 932 up->u_flags &= ~UF_ESPINUDP_ALL; 933 #endif 934 break; 935 #ifdef IPSEC_NAT_T 936 case UDP_ENCAP_ESPINUDP: 937 case UDP_ENCAP_ESPINUDP_NON_IKE: 938 up->u_flags &= ~UF_ESPINUDP_ALL; 939 if (optval == UDP_ENCAP_ESPINUDP) 940 up->u_flags |= UF_ESPINUDP; 941 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE) 942 up->u_flags |= UF_ESPINUDP_NON_IKE; 943 break; 944 #endif 945 default: 946 error = EINVAL; 947 break; 948 } 949 INP_WUNLOCK(inp); 950 break; 951 default: 952 INP_WUNLOCK(inp); 953 error = ENOPROTOOPT; 954 break; 955 } 956 break; 957 case SOPT_GET: 958 switch (sopt->sopt_name) { 959 #ifdef IPSEC_NAT_T 960 case UDP_ENCAP: 961 up = intoudpcb(inp); 962 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 963 optval = up->u_flags & UF_ESPINUDP_ALL; 964 INP_WUNLOCK(inp); 965 error = sooptcopyout(sopt, &optval, sizeof optval); 966 break; 967 #endif 968 default: 969 INP_WUNLOCK(inp); 970 error = ENOPROTOOPT; 971 break; 972 } 973 break; 974 } 975 return (error); 976 } 977 978 static int 979 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, 980 struct mbuf *control, struct thread *td) 981 { 982 struct udpiphdr *ui; 983 int len = m->m_pkthdr.len; 984 struct in_addr faddr, laddr; 985 struct cmsghdr *cm; 986 struct sockaddr_in *sin, src; 987 int error = 0; 988 int ipflags; 989 u_short fport, lport; 990 int unlock_udbinfo; 991 u_char tos; 992 993 /* 994 * udp_output() may need to temporarily bind or connect the current 995 * inpcb. As such, we don't know up front whether we will need the 996 * pcbinfo lock or not. Do any work to decide what is needed up 997 * front before acquiring any locks. 998 */ 999 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { 1000 if (control) 1001 m_freem(control); 1002 m_freem(m); 1003 return (EMSGSIZE); 1004 } 1005 1006 src.sin_family = 0; 1007 tos = inp->inp_ip_tos; 1008 if (control != NULL) { 1009 /* 1010 * XXX: Currently, we assume all the optional information is 1011 * stored in a single mbuf. 1012 */ 1013 if (control->m_next) { 1014 m_freem(control); 1015 m_freem(m); 1016 return (EINVAL); 1017 } 1018 for (; control->m_len > 0; 1019 control->m_data += CMSG_ALIGN(cm->cmsg_len), 1020 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1021 cm = mtod(control, struct cmsghdr *); 1022 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 1023 || cm->cmsg_len > control->m_len) { 1024 error = EINVAL; 1025 break; 1026 } 1027 if (cm->cmsg_level != IPPROTO_IP) 1028 continue; 1029 1030 switch (cm->cmsg_type) { 1031 case IP_SENDSRCADDR: 1032 if (cm->cmsg_len != 1033 CMSG_LEN(sizeof(struct in_addr))) { 1034 error = EINVAL; 1035 break; 1036 } 1037 bzero(&src, sizeof(src)); 1038 src.sin_family = AF_INET; 1039 src.sin_len = sizeof(src); 1040 src.sin_port = inp->inp_lport; 1041 src.sin_addr = 1042 *(struct in_addr *)CMSG_DATA(cm); 1043 break; 1044 1045 case IP_TOS: 1046 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) { 1047 error = EINVAL; 1048 break; 1049 } 1050 tos = *(u_char *)CMSG_DATA(cm); 1051 break; 1052 1053 default: 1054 error = ENOPROTOOPT; 1055 break; 1056 } 1057 if (error) 1058 break; 1059 } 1060 m_freem(control); 1061 } 1062 if (error) { 1063 m_freem(m); 1064 return (error); 1065 } 1066 1067 /* 1068 * Depending on whether or not the application has bound or connected 1069 * the socket, we may have to do varying levels of work. The optimal 1070 * case is for a connected UDP socket, as a global lock isn't 1071 * required at all. 1072 * 1073 * In order to decide which we need, we require stability of the 1074 * inpcb binding, which we ensure by acquiring a read lock on the 1075 * inpcb. This doesn't strictly follow the lock order, so we play 1076 * the trylock and retry game; note that we may end up with more 1077 * conservative locks than required the second time around, so later 1078 * assertions have to accept that. Further analysis of the number of 1079 * misses under contention is required. 1080 */ 1081 sin = (struct sockaddr_in *)addr; 1082 INP_RLOCK(inp); 1083 if (sin != NULL && 1084 (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { 1085 INP_RUNLOCK(inp); 1086 INP_INFO_WLOCK(&V_udbinfo); 1087 INP_WLOCK(inp); 1088 unlock_udbinfo = 2; 1089 } else if ((sin != NULL && ( 1090 (sin->sin_addr.s_addr == INADDR_ANY) || 1091 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 1092 (inp->inp_laddr.s_addr == INADDR_ANY) || 1093 (inp->inp_lport == 0))) || 1094 (src.sin_family == AF_INET)) { 1095 if (!INP_INFO_TRY_RLOCK(&V_udbinfo)) { 1096 INP_RUNLOCK(inp); 1097 INP_INFO_RLOCK(&V_udbinfo); 1098 INP_RLOCK(inp); 1099 } 1100 unlock_udbinfo = 1; 1101 } else 1102 unlock_udbinfo = 0; 1103 1104 /* 1105 * If the IP_SENDSRCADDR control message was specified, override the 1106 * source address for this datagram. Its use is invalidated if the 1107 * address thus specified is incomplete or clobbers other inpcbs. 1108 */ 1109 laddr = inp->inp_laddr; 1110 lport = inp->inp_lport; 1111 if (src.sin_family == AF_INET) { 1112 INP_INFO_LOCK_ASSERT(&V_udbinfo); 1113 if ((lport == 0) || 1114 (laddr.s_addr == INADDR_ANY && 1115 src.sin_addr.s_addr == INADDR_ANY)) { 1116 error = EINVAL; 1117 goto release; 1118 } 1119 error = in_pcbbind_setup(inp, (struct sockaddr *)&src, 1120 &laddr.s_addr, &lport, td->td_ucred); 1121 if (error) 1122 goto release; 1123 } 1124 1125 /* 1126 * If a UDP socket has been connected, then a local address/port will 1127 * have been selected and bound. 1128 * 1129 * If a UDP socket has not been connected to, then an explicit 1130 * destination address must be used, in which case a local 1131 * address/port may not have been selected and bound. 1132 */ 1133 if (sin != NULL) { 1134 INP_LOCK_ASSERT(inp); 1135 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1136 error = EISCONN; 1137 goto release; 1138 } 1139 1140 /* 1141 * Jail may rewrite the destination address, so let it do 1142 * that before we use it. 1143 */ 1144 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1145 if (error) 1146 goto release; 1147 1148 /* 1149 * If a local address or port hasn't yet been selected, or if 1150 * the destination address needs to be rewritten due to using 1151 * a special INADDR_ constant, invoke in_pcbconnect_setup() 1152 * to do the heavy lifting. Once a port is selected, we 1153 * commit the binding back to the socket; we also commit the 1154 * binding of the address if in jail. 1155 * 1156 * If we already have a valid binding and we're not 1157 * requesting a destination address rewrite, use a fast path. 1158 */ 1159 if (inp->inp_laddr.s_addr == INADDR_ANY || 1160 inp->inp_lport == 0 || 1161 sin->sin_addr.s_addr == INADDR_ANY || 1162 sin->sin_addr.s_addr == INADDR_BROADCAST) { 1163 INP_INFO_LOCK_ASSERT(&V_udbinfo); 1164 error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, 1165 &lport, &faddr.s_addr, &fport, NULL, 1166 td->td_ucred); 1167 if (error) 1168 goto release; 1169 1170 /* 1171 * XXXRW: Why not commit the port if the address is 1172 * !INADDR_ANY? 1173 */ 1174 /* Commit the local port if newly assigned. */ 1175 if (inp->inp_laddr.s_addr == INADDR_ANY && 1176 inp->inp_lport == 0) { 1177 INP_INFO_WLOCK_ASSERT(&V_udbinfo); 1178 INP_WLOCK_ASSERT(inp); 1179 /* 1180 * Remember addr if jailed, to prevent 1181 * rebinding. 1182 */ 1183 if (prison_flag(td->td_ucred, PR_IP4)) 1184 inp->inp_laddr = laddr; 1185 inp->inp_lport = lport; 1186 if (in_pcbinshash(inp) != 0) { 1187 inp->inp_lport = 0; 1188 error = EAGAIN; 1189 goto release; 1190 } 1191 inp->inp_flags |= INP_ANONPORT; 1192 } 1193 } else { 1194 faddr = sin->sin_addr; 1195 fport = sin->sin_port; 1196 } 1197 } else { 1198 INP_LOCK_ASSERT(inp); 1199 faddr = inp->inp_faddr; 1200 fport = inp->inp_fport; 1201 if (faddr.s_addr == INADDR_ANY) { 1202 error = ENOTCONN; 1203 goto release; 1204 } 1205 } 1206 1207 /* 1208 * Calculate data length and get a mbuf for UDP, IP, and possible 1209 * link-layer headers. Immediate slide the data pointer back forward 1210 * since we won't use that space at this layer. 1211 */ 1212 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_DONTWAIT); 1213 if (m == NULL) { 1214 error = ENOBUFS; 1215 goto release; 1216 } 1217 m->m_data += max_linkhdr; 1218 m->m_len -= max_linkhdr; 1219 m->m_pkthdr.len -= max_linkhdr; 1220 1221 /* 1222 * Fill in mbuf with extended UDP header and addresses and length put 1223 * into network format. 1224 */ 1225 ui = mtod(m, struct udpiphdr *); 1226 bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ 1227 ui->ui_pr = IPPROTO_UDP; 1228 ui->ui_src = laddr; 1229 ui->ui_dst = faddr; 1230 ui->ui_sport = lport; 1231 ui->ui_dport = fport; 1232 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); 1233 1234 /* 1235 * Set the Don't Fragment bit in the IP header. 1236 */ 1237 if (inp->inp_flags & INP_DONTFRAG) { 1238 struct ip *ip; 1239 1240 ip = (struct ip *)&ui->ui_i; 1241 ip->ip_off |= IP_DF; 1242 } 1243 1244 ipflags = 0; 1245 if (inp->inp_socket->so_options & SO_DONTROUTE) 1246 ipflags |= IP_ROUTETOIF; 1247 if (inp->inp_socket->so_options & SO_BROADCAST) 1248 ipflags |= IP_ALLOWBROADCAST; 1249 if (inp->inp_flags & INP_ONESBCAST) 1250 ipflags |= IP_SENDONES; 1251 1252 #ifdef MAC 1253 mac_inpcb_create_mbuf(inp, m); 1254 #endif 1255 1256 /* 1257 * Set up checksum and output datagram. 1258 */ 1259 if (V_udp_cksum) { 1260 if (inp->inp_flags & INP_ONESBCAST) 1261 faddr.s_addr = INADDR_BROADCAST; 1262 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, 1263 htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); 1264 m->m_pkthdr.csum_flags = CSUM_UDP; 1265 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 1266 } else 1267 ui->ui_sum = 0; 1268 ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; 1269 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ 1270 ((struct ip *)ui)->ip_tos = tos; /* XXX */ 1271 UDPSTAT_INC(udps_opackets); 1272 1273 if (unlock_udbinfo == 2) 1274 INP_INFO_WUNLOCK(&V_udbinfo); 1275 else if (unlock_udbinfo == 1) 1276 INP_INFO_RUNLOCK(&V_udbinfo); 1277 error = ip_output(m, inp->inp_options, NULL, ipflags, 1278 inp->inp_moptions, inp); 1279 if (unlock_udbinfo == 2) 1280 INP_WUNLOCK(inp); 1281 else 1282 INP_RUNLOCK(inp); 1283 return (error); 1284 1285 release: 1286 if (unlock_udbinfo == 2) { 1287 INP_WUNLOCK(inp); 1288 INP_INFO_WUNLOCK(&V_udbinfo); 1289 } else if (unlock_udbinfo == 1) { 1290 INP_RUNLOCK(inp); 1291 INP_INFO_RUNLOCK(&V_udbinfo); 1292 } else 1293 INP_RUNLOCK(inp); 1294 m_freem(m); 1295 return (error); 1296 } 1297 1298 1299 #if defined(IPSEC) && defined(IPSEC_NAT_T) 1300 #ifdef INET 1301 /* 1302 * Potentially decap ESP in UDP frame. Check for an ESP header 1303 * and optional marker; if present, strip the UDP header and 1304 * push the result through IPSec. 1305 * 1306 * Returns mbuf to be processed (potentially re-allocated) or 1307 * NULL if consumed and/or processed. 1308 */ 1309 static struct mbuf * 1310 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off) 1311 { 1312 size_t minlen, payload, skip, iphlen; 1313 caddr_t data; 1314 struct udpcb *up; 1315 struct m_tag *tag; 1316 struct udphdr *udphdr; 1317 struct ip *ip; 1318 1319 INP_RLOCK_ASSERT(inp); 1320 1321 /* 1322 * Pull up data so the longest case is contiguous: 1323 * IP/UDP hdr + non ESP marker + ESP hdr. 1324 */ 1325 minlen = off + sizeof(uint64_t) + sizeof(struct esp); 1326 if (minlen > m->m_pkthdr.len) 1327 minlen = m->m_pkthdr.len; 1328 if ((m = m_pullup(m, minlen)) == NULL) { 1329 V_ipsec4stat.in_inval++; 1330 return (NULL); /* Bypass caller processing. */ 1331 } 1332 data = mtod(m, caddr_t); /* Points to ip header. */ 1333 payload = m->m_len - off; /* Size of payload. */ 1334 1335 if (payload == 1 && data[off] == '\xff') 1336 return (m); /* NB: keepalive packet, no decap. */ 1337 1338 up = intoudpcb(inp); 1339 KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); 1340 KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0, 1341 ("u_flags 0x%x", up->u_flags)); 1342 1343 /* 1344 * Check that the payload is large enough to hold an 1345 * ESP header and compute the amount of data to remove. 1346 * 1347 * NB: the caller has already done a pullup for us. 1348 * XXX can we assume alignment and eliminate bcopys? 1349 */ 1350 if (up->u_flags & UF_ESPINUDP_NON_IKE) { 1351 /* 1352 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 1353 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring 1354 * possible AH mode non-IKE marker+non-ESP marker 1355 * from draft-ietf-ipsec-udp-encaps-00.txt. 1356 */ 1357 uint64_t marker; 1358 1359 if (payload <= sizeof(uint64_t) + sizeof(struct esp)) 1360 return (m); /* NB: no decap. */ 1361 bcopy(data + off, &marker, sizeof(uint64_t)); 1362 if (marker != 0) /* Non-IKE marker. */ 1363 return (m); /* NB: no decap. */ 1364 skip = sizeof(uint64_t) + sizeof(struct udphdr); 1365 } else { 1366 uint32_t spi; 1367 1368 if (payload <= sizeof(struct esp)) { 1369 V_ipsec4stat.in_inval++; 1370 m_freem(m); 1371 return (NULL); /* Discard. */ 1372 } 1373 bcopy(data + off, &spi, sizeof(uint32_t)); 1374 if (spi == 0) /* Non-ESP marker. */ 1375 return (m); /* NB: no decap. */ 1376 skip = sizeof(struct udphdr); 1377 } 1378 1379 /* 1380 * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember 1381 * the UDP ports. This is required if we want to select 1382 * the right SPD for multiple hosts behind same NAT. 1383 * 1384 * NB: ports are maintained in network byte order everywhere 1385 * in the NAT-T code. 1386 */ 1387 tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, 1388 2 * sizeof(uint16_t), M_NOWAIT); 1389 if (tag == NULL) { 1390 V_ipsec4stat.in_nomem++; 1391 m_freem(m); 1392 return (NULL); /* Discard. */ 1393 } 1394 iphlen = off - sizeof(struct udphdr); 1395 udphdr = (struct udphdr *)(data + iphlen); 1396 ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport; 1397 ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport; 1398 m_tag_prepend(m, tag); 1399 1400 /* 1401 * Remove the UDP header (and possibly the non ESP marker) 1402 * IP header length is iphlen 1403 * Before: 1404 * <--- off ---> 1405 * +----+------+-----+ 1406 * | IP | UDP | ESP | 1407 * +----+------+-----+ 1408 * <-skip-> 1409 * After: 1410 * +----+-----+ 1411 * | IP | ESP | 1412 * +----+-----+ 1413 * <-skip-> 1414 */ 1415 ovbcopy(data, data + skip, iphlen); 1416 m_adj(m, skip); 1417 1418 ip = mtod(m, struct ip *); 1419 ip->ip_len -= skip; 1420 ip->ip_p = IPPROTO_ESP; 1421 1422 /* 1423 * We cannot yet update the cksums so clear any 1424 * h/w cksum flags as they are no longer valid. 1425 */ 1426 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) 1427 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 1428 1429 (void) ipsec4_common_input(m, iphlen, ip->ip_p); 1430 return (NULL); /* NB: consumed, bypass processing. */ 1431 } 1432 #endif /* INET */ 1433 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */ 1434 1435 static void 1436 udp_abort(struct socket *so) 1437 { 1438 struct inpcb *inp; 1439 1440 inp = sotoinpcb(so); 1441 KASSERT(inp != NULL, ("udp_abort: inp == NULL")); 1442 INP_INFO_WLOCK(&V_udbinfo); 1443 INP_WLOCK(inp); 1444 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1445 in_pcbdisconnect(inp); 1446 inp->inp_laddr.s_addr = INADDR_ANY; 1447 soisdisconnected(so); 1448 } 1449 INP_WUNLOCK(inp); 1450 INP_INFO_WUNLOCK(&V_udbinfo); 1451 } 1452 1453 static int 1454 udp_attach(struct socket *so, int proto, struct thread *td) 1455 { 1456 struct inpcb *inp; 1457 int error; 1458 1459 inp = sotoinpcb(so); 1460 KASSERT(inp == NULL, ("udp_attach: inp != NULL")); 1461 error = soreserve(so, udp_sendspace, udp_recvspace); 1462 if (error) 1463 return (error); 1464 INP_INFO_WLOCK(&V_udbinfo); 1465 error = in_pcballoc(so, &V_udbinfo); 1466 if (error) { 1467 INP_INFO_WUNLOCK(&V_udbinfo); 1468 return (error); 1469 } 1470 1471 inp = sotoinpcb(so); 1472 inp->inp_vflag |= INP_IPV4; 1473 inp->inp_ip_ttl = V_ip_defttl; 1474 1475 error = udp_newudpcb(inp); 1476 if (error) { 1477 in_pcbdetach(inp); 1478 in_pcbfree(inp); 1479 INP_INFO_WUNLOCK(&V_udbinfo); 1480 return (error); 1481 } 1482 1483 INP_WUNLOCK(inp); 1484 INP_INFO_WUNLOCK(&V_udbinfo); 1485 return (0); 1486 } 1487 1488 int 1489 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f) 1490 { 1491 struct inpcb *inp; 1492 struct udpcb *up; 1493 1494 KASSERT(so->so_type == SOCK_DGRAM, 1495 ("udp_set_kernel_tunneling: !dgram")); 1496 inp = sotoinpcb(so); 1497 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL")); 1498 INP_WLOCK(inp); 1499 up = intoudpcb(inp); 1500 if (up->u_tun_func != NULL) { 1501 INP_WUNLOCK(inp); 1502 return (EBUSY); 1503 } 1504 up->u_tun_func = f; 1505 INP_WUNLOCK(inp); 1506 return (0); 1507 } 1508 1509 static int 1510 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 1511 { 1512 struct inpcb *inp; 1513 int error; 1514 1515 inp = sotoinpcb(so); 1516 KASSERT(inp != NULL, ("udp_bind: inp == NULL")); 1517 INP_INFO_WLOCK(&V_udbinfo); 1518 INP_WLOCK(inp); 1519 error = in_pcbbind(inp, nam, td->td_ucred); 1520 INP_WUNLOCK(inp); 1521 INP_INFO_WUNLOCK(&V_udbinfo); 1522 return (error); 1523 } 1524 1525 static void 1526 udp_close(struct socket *so) 1527 { 1528 struct inpcb *inp; 1529 1530 inp = sotoinpcb(so); 1531 KASSERT(inp != NULL, ("udp_close: inp == NULL")); 1532 INP_INFO_WLOCK(&V_udbinfo); 1533 INP_WLOCK(inp); 1534 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1535 in_pcbdisconnect(inp); 1536 inp->inp_laddr.s_addr = INADDR_ANY; 1537 soisdisconnected(so); 1538 } 1539 INP_WUNLOCK(inp); 1540 INP_INFO_WUNLOCK(&V_udbinfo); 1541 } 1542 1543 static int 1544 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 1545 { 1546 struct inpcb *inp; 1547 int error; 1548 struct sockaddr_in *sin; 1549 1550 inp = sotoinpcb(so); 1551 KASSERT(inp != NULL, ("udp_connect: inp == NULL")); 1552 INP_INFO_WLOCK(&V_udbinfo); 1553 INP_WLOCK(inp); 1554 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1555 INP_WUNLOCK(inp); 1556 INP_INFO_WUNLOCK(&V_udbinfo); 1557 return (EISCONN); 1558 } 1559 sin = (struct sockaddr_in *)nam; 1560 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); 1561 if (error != 0) { 1562 INP_WUNLOCK(inp); 1563 INP_INFO_WUNLOCK(&V_udbinfo); 1564 return (error); 1565 } 1566 error = in_pcbconnect(inp, nam, td->td_ucred); 1567 if (error == 0) 1568 soisconnected(so); 1569 INP_WUNLOCK(inp); 1570 INP_INFO_WUNLOCK(&V_udbinfo); 1571 return (error); 1572 } 1573 1574 static void 1575 udp_detach(struct socket *so) 1576 { 1577 struct inpcb *inp; 1578 struct udpcb *up; 1579 1580 inp = sotoinpcb(so); 1581 KASSERT(inp != NULL, ("udp_detach: inp == NULL")); 1582 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, 1583 ("udp_detach: not disconnected")); 1584 INP_INFO_WLOCK(&V_udbinfo); 1585 INP_WLOCK(inp); 1586 up = intoudpcb(inp); 1587 KASSERT(up != NULL, ("%s: up == NULL", __func__)); 1588 inp->inp_ppcb = NULL; 1589 in_pcbdetach(inp); 1590 in_pcbfree(inp); 1591 INP_INFO_WUNLOCK(&V_udbinfo); 1592 udp_discardcb(up); 1593 } 1594 1595 static int 1596 udp_disconnect(struct socket *so) 1597 { 1598 struct inpcb *inp; 1599 1600 inp = sotoinpcb(so); 1601 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); 1602 INP_INFO_WLOCK(&V_udbinfo); 1603 INP_WLOCK(inp); 1604 if (inp->inp_faddr.s_addr == INADDR_ANY) { 1605 INP_WUNLOCK(inp); 1606 INP_INFO_WUNLOCK(&V_udbinfo); 1607 return (ENOTCONN); 1608 } 1609 1610 in_pcbdisconnect(inp); 1611 inp->inp_laddr.s_addr = INADDR_ANY; 1612 SOCK_LOCK(so); 1613 so->so_state &= ~SS_ISCONNECTED; /* XXX */ 1614 SOCK_UNLOCK(so); 1615 INP_WUNLOCK(inp); 1616 INP_INFO_WUNLOCK(&V_udbinfo); 1617 return (0); 1618 } 1619 1620 static int 1621 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 1622 struct mbuf *control, struct thread *td) 1623 { 1624 struct inpcb *inp; 1625 1626 inp = sotoinpcb(so); 1627 KASSERT(inp != NULL, ("udp_send: inp == NULL")); 1628 return (udp_output(inp, m, addr, control, td)); 1629 } 1630 1631 int 1632 udp_shutdown(struct socket *so) 1633 { 1634 struct inpcb *inp; 1635 1636 inp = sotoinpcb(so); 1637 KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); 1638 INP_WLOCK(inp); 1639 socantsendmore(so); 1640 INP_WUNLOCK(inp); 1641 return (0); 1642 } 1643 1644 struct pr_usrreqs udp_usrreqs = { 1645 .pru_abort = udp_abort, 1646 .pru_attach = udp_attach, 1647 .pru_bind = udp_bind, 1648 .pru_connect = udp_connect, 1649 .pru_control = in_control, 1650 .pru_detach = udp_detach, 1651 .pru_disconnect = udp_disconnect, 1652 .pru_peeraddr = in_getpeeraddr, 1653 .pru_send = udp_send, 1654 .pru_soreceive = soreceive_dgram, 1655 .pru_sosend = sosend_dgram, 1656 .pru_shutdown = udp_shutdown, 1657 .pru_sockaddr = in_getsockaddr, 1658 .pru_sosetlabel = in_pcbsosetlabel, 1659 .pru_close = udp_close, 1660 };
Cache object: 644ac6b26eed1f1bd59bdaf987d1bb24
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