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