sys/netinet/udp_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2008 Robert N. M. Watson
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * Copyright (c) 2014 Kevin Lo
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed by Robert N. M. Watson under
  10  * contract to Juniper Networks, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include "opt_ipfw.h"
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_ipsec.h"
  46 #include "opt_kdtrace.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/domain.h>
  50 #include <sys/eventhandler.h>
  51 #include <sys/jail.h>
  52 #include <sys/kernel.h>
  53 #include <sys/lock.h>
  54 #include <sys/malloc.h>
  55 #include <sys/mbuf.h>
  56 #include <sys/priv.h>
  57 #include <sys/proc.h>
  58 #include <sys/protosw.h>
  59 #include <sys/sdt.h>
  60 #include <sys/signalvar.h>
  61 #include <sys/socket.h>
  62 #include <sys/socketvar.h>
  63 #include <sys/sx.h>
  64 #include <sys/sysctl.h>
  65 #include <sys/syslog.h>
  66 #include <sys/systm.h>
  67
  68 #include <vm/uma.h>
  69
  70 #include <net/if.h>
  71 #include <net/route.h>
  72
  73 #include <netinet/in.h>
  74 #include <netinet/in_kdtrace.h>
  75 #include <netinet/in_pcb.h>
  76 #include <netinet/in_systm.h>
  77 #include <netinet/in_var.h>
  78 #include <netinet/ip.h>
  79 #ifdef INET6
  80 #include <netinet/ip6.h>
  81 #endif
  82 #include <netinet/ip_icmp.h>
  83 #include <netinet/icmp_var.h>
  84 #include <netinet/ip_var.h>
  85 #include <netinet/ip_options.h>
  86 #ifdef INET6
  87 #include <netinet6/ip6_var.h>
  88 #endif
  89 #include <netinet/udp.h>
  90 #include <netinet/udp_var.h>
  91 #include <netinet/udplite.h>
  92
  93 #ifdef IPSEC
  94 #include <netipsec/ipsec.h>
  95 #include <netipsec/esp.h>
  96 #endif
  97
  98 #include <machine/in_cksum.h>
  99
 100 #include <security/mac/mac_framework.h>
 101
 102 /*
 103  * UDP and UDP-Lite protocols implementation.
 104  * Per RFC 768, August, 1980.
 105  * Per RFC 3828, July, 2004.
 106  */
 107
 108 /*
 109  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 110  * removes the only data integrity mechanism for packets and malformed
 111  * packets that would otherwise be discarded due to bad checksums, and may
 112  * cause problems (especially for NFS data blocks).
 113  */
 114 VNET_DEFINE(int, udp_cksum) = 1;
 115 SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
 116     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 117
 118 int     udp_log_in_vain = 0;
 119 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 120     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 121
 122 VNET_DEFINE(int, udp_blackhole) = 0;
 123 SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
 124     &VNET_NAME(udp_blackhole), 0,
 125     "Do not send port unreachables for refused connects");
 126
 127 u_long  udp_sendspace = 9216;           /* really max datagram size */
 128                                         /* 40 1K datagrams */
 129 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 130     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 131
 132 u_long  udp_recvspace = 40 * (1024 +
 133 #ifdef INET6
 134                                       sizeof(struct sockaddr_in6)
 135 #else
 136                                       sizeof(struct sockaddr_in)
 137 #endif
 138                                       );
 139
 140 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 141     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 142
 143 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 144 VNET_DEFINE(struct inpcbinfo, udbinfo);
 145 VNET_DEFINE(struct inpcbhead, ulitecb);
 146 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 147 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 148 #define V_udpcb_zone                    VNET(udpcb_zone)
 149
 150 #ifndef UDBHASHSIZE
 151 #define UDBHASHSIZE     128
 152 #endif
 153
 154 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 155 VNET_PCPUSTAT_SYSINIT(udpstat);
 156 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 157     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 158
 159 #ifdef VIMAGE
 160 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 161 #endif /* VIMAGE */
 162 #ifdef INET
 163 static void     udp_detach(struct socket *so);
 164 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 165                     struct mbuf *, struct thread *);
 166 #endif
 167
 168 #ifdef IPSEC
 169 #ifdef IPSEC_NAT_T
 170 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
 171 #ifdef INET
 172 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
 173 #endif
 174 #endif /* IPSEC_NAT_T */
 175 #endif /* IPSEC */
 176
 177 static void
 178 udp_zone_change(void *tag)
 179 {
 180
 181         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 182         uma_zone_set_max(V_udpcb_zone, maxsockets);
 183 }
 184
 185 static int
 186 udp_inpcb_init(void *mem, int size, int flags)
 187 {
 188         struct inpcb *inp;
 189
 190         inp = mem;
 191         INP_LOCK_INIT(inp, "inp", "udpinp");
 192         return (0);
 193 }
 194
 195 static int
 196 udplite_inpcb_init(void *mem, int size, int flags)
 197 {
 198         struct inpcb *inp;
 199
 200         inp = mem;
 201         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 202         return (0);
 203 }
 204
 205 void
 206 udp_init(void)
 207 {
 208
 209         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 210             "udp_inpcb", udp_inpcb_init, NULL, UMA_ZONE_NOFREE,
 211             IPI_HASHFIELDS_2TUPLE);
 212         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 213             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 214         uma_zone_set_max(V_udpcb_zone, maxsockets);
 215         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 216         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 217             EVENTHANDLER_PRI_ANY);
 218 }
 219
 220 void
 221 udplite_init(void)
 222 {
 223
 224         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 225             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 226             UMA_ZONE_NOFREE, IPI_HASHFIELDS_2TUPLE);
 227 }
 228
 229 /*
 230  * Kernel module interface for updating udpstat.  The argument is an index
 231  * into udpstat treated as an array of u_long.  While this encodes the
 232  * general layout of udpstat into the caller, it doesn't encode its location,
 233  * so that future changes to add, for example, per-CPU stats support won't
 234  * cause binary compatibility problems for kernel modules.
 235  */
 236 void
 237 kmod_udpstat_inc(int statnum)
 238 {
 239
 240         counter_u64_add(VNET(udpstat)[statnum], 1);
 241 }
 242
 243 int
 244 udp_newudpcb(struct inpcb *inp)
 245 {
 246         struct udpcb *up;
 247
 248         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 249         if (up == NULL)
 250                 return (ENOBUFS);
 251         inp->inp_ppcb = up;
 252         return (0);
 253 }
 254
 255 void
 256 udp_discardcb(struct udpcb *up)
 257 {
 258
 259         uma_zfree(V_udpcb_zone, up);
 260 }
 261
 262 #ifdef VIMAGE
 263 void
 264 udp_destroy(void)
 265 {
 266
 267         in_pcbinfo_destroy(&V_udbinfo);
 268         uma_zdestroy(V_udpcb_zone);
 269 }
 270
 271 void
 272 udplite_destroy(void)
 273 {
 274
 275         in_pcbinfo_destroy(&V_ulitecbinfo);
 276 }
 277 #endif
 278
 279 #ifdef INET
 280 /*
 281  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 282  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 283  * contains the source address.  If the socket ends up being an IPv6 socket,
 284  * udp_append() will convert to a sockaddr_in6 before passing the address
 285  * into the socket code.
 286  */
 287 static void
 288 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 289     struct sockaddr_in *udp_in)
 290 {
 291         struct sockaddr *append_sa;
 292         struct socket *so;
 293         struct mbuf *opts = 0;
 294 #ifdef INET6
 295         struct sockaddr_in6 udp_in6;
 296 #endif
 297         struct udpcb *up;
 298
 299         INP_LOCK_ASSERT(inp);
 300
 301         /*
 302          * Engage the tunneling protocol.
 303          */
 304         up = intoudpcb(inp);
 305         if (up->u_tun_func != NULL) {
 306                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 307                     up->u_tun_ctx);
 308                 return;
 309         }
 310
 311         off += sizeof(struct udphdr);
 312
 313 #ifdef IPSEC
 314         /* Check AH/ESP integrity. */
 315         if (ipsec4_in_reject(n, inp)) {
 316                 m_freem(n);
 317                 IPSECSTAT_INC(ips_in_polvio);
 318                 return;
 319         }
 320 #ifdef IPSEC_NAT_T
 321         up = intoudpcb(inp);
 322         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 323         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 324                 n = udp4_espdecap(inp, n, off);
 325                 if (n == NULL)                          /* Consumed. */
 326                         return;
 327         }
 328 #endif /* IPSEC_NAT_T */
 329 #endif /* IPSEC */
 330 #ifdef MAC
 331         if (mac_inpcb_check_deliver(inp, n) != 0) {
 332                 m_freem(n);
 333                 return;
 334         }
 335 #endif /* MAC */
 336         if (inp->inp_flags & INP_CONTROLOPTS ||
 337             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 338 #ifdef INET6
 339                 if (inp->inp_vflag & INP_IPV6)
 340                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 341                 else
 342 #endif /* INET6 */
 343                         ip_savecontrol(inp, &opts, ip, n);
 344         }
 345 #ifdef INET6
 346         if (inp->inp_vflag & INP_IPV6) {
 347                 bzero(&udp_in6, sizeof(udp_in6));
 348                 udp_in6.sin6_len = sizeof(udp_in6);
 349                 udp_in6.sin6_family = AF_INET6;
 350                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 351                 append_sa = (struct sockaddr *)&udp_in6;
 352         } else
 353 #endif /* INET6 */
 354                 append_sa = (struct sockaddr *)udp_in;
 355         m_adj(n, off);
 356
 357         so = inp->inp_socket;
 358         SOCKBUF_LOCK(&so->so_rcv);
 359         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 360                 SOCKBUF_UNLOCK(&so->so_rcv);
 361                 m_freem(n);
 362                 if (opts)
 363                         m_freem(opts);
 364                 UDPSTAT_INC(udps_fullsock);
 365         } else
 366                 sorwakeup_locked(so);
 367 }
 368
 369 void
 370 udp_input(struct mbuf *m, int off)
 371 {
 372         int iphlen = off;
 373         struct ip *ip;
 374         struct udphdr *uh;
 375         struct ifnet *ifp;
 376         struct inpcb *inp;
 377         uint16_t len, ip_len;
 378         struct inpcbinfo *pcbinfo;
 379         struct ip save_ip;
 380         struct sockaddr_in udp_in;
 381         struct m_tag *fwd_tag;
 382         int cscov_partial;
 383         uint8_t pr;
 384
 385         ifp = m->m_pkthdr.rcvif;
 386         UDPSTAT_INC(udps_ipackets);
 387
 388         /*
 389          * Strip IP options, if any; should skip this, make available to
 390          * user, and use on returned packets, but we don't yet have a way to
 391          * check the checksum with options still present.
 392          */
 393         if (iphlen > sizeof (struct ip)) {
 394                 ip_stripoptions(m);
 395                 iphlen = sizeof(struct ip);
 396         }
 397
 398         /*
 399          * Get IP and UDP header together in first mbuf.
 400          */
 401         ip = mtod(m, struct ip *);
 402         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 403                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 404                         UDPSTAT_INC(udps_hdrops);
 405                         return;
 406                 }
 407                 ip = mtod(m, struct ip *);
 408         }
 409         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 410         pr = ip->ip_p;
 411         cscov_partial = (pr == IPPROTO_UDPLITE) ? 1 : 0;
 412
 413         /*
 414          * Destination port of 0 is illegal, based on RFC768.
 415          */
 416         if (uh->uh_dport == 0)
 417                 goto badunlocked;
 418
 419         /*
 420          * Construct sockaddr format source address.  Stuff source address
 421          * and datagram in user buffer.
 422          */
 423         bzero(&udp_in, sizeof(udp_in));
 424         udp_in.sin_len = sizeof(udp_in);
 425         udp_in.sin_family = AF_INET;
 426         udp_in.sin_port = uh->uh_sport;
 427         udp_in.sin_addr = ip->ip_src;
 428
 429         /*
 430          * Make mbuf data length reflect UDP length.  If not enough data to
 431          * reflect UDP length, drop.
 432          */
 433         len = ntohs((u_short)uh->uh_ulen);
 434         ip_len = ntohs(ip->ip_len) - iphlen;
 435         if (pr == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 436                 /* Zero means checksum over the complete packet. */
 437                 if (len == 0)
 438                         len = ip_len;
 439                 cscov_partial = 0;
 440         }
 441         if (ip_len != len) {
 442                 if (len > ip_len || len < sizeof(struct udphdr)) {
 443                         UDPSTAT_INC(udps_badlen);
 444                         goto badunlocked;
 445                 }
 446                 if (pr == IPPROTO_UDP)
 447                         m_adj(m, len - ip_len);
 448         }
 449
 450         /*
 451          * Save a copy of the IP header in case we want restore it for
 452          * sending an ICMP error message in response.
 453          */
 454         if (!V_udp_blackhole)
 455                 save_ip = *ip;
 456         else
 457                 memset(&save_ip, 0, sizeof(save_ip));
 458
 459         /*
 460          * Checksum extended UDP header and data.
 461          */
 462         if (uh->uh_sum) {
 463                 u_short uh_sum;
 464
 465                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 466                     !cscov_partial) {
 467                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 468                                 uh_sum = m->m_pkthdr.csum_data;
 469                         else
 470                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 471                                     ip->ip_dst.s_addr, htonl((u_short)len +
 472                                     m->m_pkthdr.csum_data + pr));
 473                         uh_sum ^= 0xffff;
 474                 } else {
 475                         char b[9];
 476
 477                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 478                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 479                         ((struct ipovly *)ip)->ih_len = (pr == IPPROTO_UDP) ?
 480                             uh->uh_ulen : htons(ip_len);
 481                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 482                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 483                 }
 484                 if (uh_sum) {
 485                         UDPSTAT_INC(udps_badsum);
 486                         m_freem(m);
 487                         return;
 488                 }
 489         } else {
 490                 if (pr == IPPROTO_UDP) {
 491                         UDPSTAT_INC(udps_nosum);
 492                 } else {
 493                         /* UDPLite requires a checksum */
 494                         /* XXX: What is the right UDPLite MIB counter here? */
 495                         m_freem(m);
 496                         return;
 497                 }
 498         }
 499
 500         pcbinfo = get_inpcbinfo(pr);
 501         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 502             in_broadcast(ip->ip_dst, ifp)) {
 503                 struct inpcb *last;
 504                 struct inpcbhead *pcblist;
 505                 struct ip_moptions *imo;
 506
 507                 INP_INFO_RLOCK(pcbinfo);
 508                 pcblist = get_pcblist(pr);
 509                 last = NULL;
 510                 LIST_FOREACH(inp, pcblist, inp_list) {
 511                         if (inp->inp_lport != uh->uh_dport)
 512                                 continue;
 513 #ifdef INET6
 514                         if ((inp->inp_vflag & INP_IPV4) == 0)
 515                                 continue;
 516 #endif
 517                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 518                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 519                                 continue;
 520                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 521                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 522                                 continue;
 523                         if (inp->inp_fport != 0 &&
 524                             inp->inp_fport != uh->uh_sport)
 525                                 continue;
 526
 527                         INP_RLOCK(inp);
 528
 529                         /*
 530                          * XXXRW: Because we weren't holding either the inpcb
 531                          * or the hash lock when we checked for a match
 532                          * before, we should probably recheck now that the
 533                          * inpcb lock is held.
 534                          */
 535
 536                         /*
 537                          * Handle socket delivery policy for any-source
 538                          * and source-specific multicast. [RFC3678]
 539                          */
 540                         imo = inp->inp_moptions;
 541                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 542                                 struct sockaddr_in       group;
 543                                 int                      blocked;
 544                                 if (imo == NULL) {
 545                                         INP_RUNLOCK(inp);
 546                                         continue;
 547                                 }
 548                                 bzero(&group, sizeof(struct sockaddr_in));
 549                                 group.sin_len = sizeof(struct sockaddr_in);
 550                                 group.sin_family = AF_INET;
 551                                 group.sin_addr = ip->ip_dst;
 552
 553                                 blocked = imo_multi_filter(imo, ifp,
 554                                         (struct sockaddr *)&group,
 555                                         (struct sockaddr *)&udp_in);
 556                                 if (blocked != MCAST_PASS) {
 557                                         if (blocked == MCAST_NOTGMEMBER)
 558                                                 IPSTAT_INC(ips_notmember);
 559                                         if (blocked == MCAST_NOTSMEMBER ||
 560                                             blocked == MCAST_MUTED)
 561                                                 UDPSTAT_INC(udps_filtermcast);
 562                                         INP_RUNLOCK(inp);
 563                                         continue;
 564                                 }
 565                         }
 566                         if (last != NULL) {
 567                                 struct mbuf *n;
 568
 569                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 570                                         UDP_PROBE(receive, NULL, last, ip,
 571                                             last, uh);
 572                                         udp_append(last, ip, n, iphlen,
 573                                             &udp_in);
 574                                 }
 575                                 INP_RUNLOCK(last);
 576                         }
 577                         last = inp;
 578                         /*
 579                          * Don't look for additional matches if this one does
 580                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 581                          * socket options set.  This heuristic avoids
 582                          * searching through all pcbs in the common case of a
 583                          * non-shared port.  It assumes that an application
 584                          * will never clear these options after setting them.
 585                          */
 586                         if ((last->inp_socket->so_options &
 587                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 588                                 break;
 589                 }
 590
 591                 if (last == NULL) {
 592                         /*
 593                          * No matching pcb found; discard datagram.  (No need
 594                          * to send an ICMP Port Unreachable for a broadcast
 595                          * or multicast datgram.)
 596                          */
 597                         UDPSTAT_INC(udps_noportbcast);
 598                         if (inp)
 599                                 INP_RUNLOCK(inp);
 600                         INP_INFO_RUNLOCK(pcbinfo);
 601                         goto badunlocked;
 602                 }
 603                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 604                 udp_append(last, ip, m, iphlen, &udp_in);
 605                 INP_RUNLOCK(last);
 606                 INP_INFO_RUNLOCK(pcbinfo);
 607                 return;
 608         }
 609
 610         /*
 611          * Locate pcb for datagram.
 612          */
 613
 614         /*
 615          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 616          */
 617         if ((m->m_flags & M_IP_NEXTHOP) &&
 618             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 619                 struct sockaddr_in *next_hop;
 620
 621                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 622
 623                 /*
 624                  * Transparently forwarded. Pretend to be the destination.
 625                  * Already got one like this?
 626                  */
 627                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 628                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 629                 if (!inp) {
 630                         /*
 631                          * It's new.  Try to find the ambushing socket.
 632                          * Because we've rewritten the destination address,
 633                          * any hardware-generated hash is ignored.
 634                          */
 635                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 636                             uh->uh_sport, next_hop->sin_addr,
 637                             next_hop->sin_port ? htons(next_hop->sin_port) :
 638                             uh->uh_dport, INPLOOKUP_WILDCARD |
 639                             INPLOOKUP_RLOCKPCB, ifp);
 640                 }
 641                 /* Remove the tag from the packet. We don't need it anymore. */
 642                 m_tag_delete(m, fwd_tag);
 643                 m->m_flags &= ~M_IP_NEXTHOP;
 644         } else
 645                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 646                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 647                     INPLOOKUP_RLOCKPCB, ifp, m);
 648         if (inp == NULL) {
 649                 if (udp_log_in_vain) {
 650                         char buf[4*sizeof "123"];
 651
 652                         strcpy(buf, inet_ntoa(ip->ip_dst));
 653                         log(LOG_INFO,
 654                             "Connection attempt to UDP %s:%d from %s:%d\n",
 655                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 656                             ntohs(uh->uh_sport));
 657                 }
 658                 UDPSTAT_INC(udps_noport);
 659                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 660                         UDPSTAT_INC(udps_noportbcast);
 661                         goto badunlocked;
 662                 }
 663                 if (V_udp_blackhole)
 664                         goto badunlocked;
 665                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 666                         goto badunlocked;
 667                 *ip = save_ip;
 668                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 669                 return;
 670         }
 671
 672         /*
 673          * Check the minimum TTL for socket.
 674          */
 675         INP_RLOCK_ASSERT(inp);
 676         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 677                 INP_RUNLOCK(inp);
 678                 m_freem(m);
 679                 return;
 680         }
 681         if (cscov_partial) {
 682                 struct udpcb *up;
 683
 684                 up = intoudpcb(inp);
 685                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 686                         INP_RUNLOCK(inp);
 687                         m_freem(m);
 688                         return;
 689                 }
 690         }
 691
 692         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 693         udp_append(inp, ip, m, iphlen, &udp_in);
 694         INP_RUNLOCK(inp);
 695         return;
 696
 697 badunlocked:
 698         m_freem(m);
 699 }
 700 #endif /* INET */
 701
 702 /*
 703  * Notify a udp user of an asynchronous error; just wake up so that they can
 704  * collect error status.
 705  */
 706 struct inpcb *
 707 udp_notify(struct inpcb *inp, int errno)
 708 {
 709
 710         /*
 711          * While udp_ctlinput() always calls udp_notify() with a read lock
 712          * when invoking it directly, in_pcbnotifyall() currently uses write
 713          * locks due to sharing code with TCP.  For now, accept either a read
 714          * or a write lock, but a read lock is sufficient.
 715          */
 716         INP_LOCK_ASSERT(inp);
 717
 718         inp->inp_socket->so_error = errno;
 719         sorwakeup(inp->inp_socket);
 720         sowwakeup(inp->inp_socket);
 721         return (inp);
 722 }
 723
 724 #ifdef INET
 725 static void
 726 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 727     struct inpcbinfo *pcbinfo)
 728 {
 729         struct ip *ip = vip;
 730         struct udphdr *uh;
 731         struct in_addr faddr;
 732         struct inpcb *inp;
 733
 734         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 735         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 736                 return;
 737
 738         /*
 739          * Redirects don't need to be handled up here.
 740          */
 741         if (PRC_IS_REDIRECT(cmd))
 742                 return;
 743
 744         /*
 745          * Hostdead is ugly because it goes linearly through all PCBs.
 746          *
 747          * XXX: We never get this from ICMP, otherwise it makes an excellent
 748          * DoS attack on machines with many connections.
 749          */
 750         if (cmd == PRC_HOSTDEAD)
 751                 ip = NULL;
 752         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 753                 return;
 754         if (ip != NULL) {
 755                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 756                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 757                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 758                 if (inp != NULL) {
 759                         INP_RLOCK_ASSERT(inp);
 760                         if (inp->inp_socket != NULL) {
 761                                 udp_notify(inp, inetctlerrmap[cmd]);
 762                         }
 763                         INP_RUNLOCK(inp);
 764                 }
 765         } else
 766                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 767                     udp_notify);
 768 }
 769 void
 770 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 771 {
 772
 773         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 774 }
 775
 776 void
 777 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 778 {
 779
 780         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 781 }
 782 #endif /* INET */
 783
 784 static int
 785 udp_pcblist(SYSCTL_HANDLER_ARGS)
 786 {
 787         int error, i, n;
 788         struct inpcb *inp, **inp_list;
 789         inp_gen_t gencnt;
 790         struct xinpgen xig;
 791
 792         /*
 793          * The process of preparing the PCB list is too time-consuming and
 794          * resource-intensive to repeat twice on every request.
 795          */
 796         if (req->oldptr == 0) {
 797                 n = V_udbinfo.ipi_count;
 798                 n += imax(n / 8, 10);
 799                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 800                 return (0);
 801         }
 802
 803         if (req->newptr != 0)
 804                 return (EPERM);
 805
 806         /*
 807          * OK, now we're committed to doing something.
 808          */
 809         INP_INFO_RLOCK(&V_udbinfo);
 810         gencnt = V_udbinfo.ipi_gencnt;
 811         n = V_udbinfo.ipi_count;
 812         INP_INFO_RUNLOCK(&V_udbinfo);
 813
 814         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 815                 + n * sizeof(struct xinpcb));
 816         if (error != 0)
 817                 return (error);
 818
 819         xig.xig_len = sizeof xig;
 820         xig.xig_count = n;
 821         xig.xig_gen = gencnt;
 822         xig.xig_sogen = so_gencnt;
 823         error = SYSCTL_OUT(req, &xig, sizeof xig);
 824         if (error)
 825                 return (error);
 826
 827         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 828         if (inp_list == 0)
 829                 return (ENOMEM);
 830
 831         INP_INFO_RLOCK(&V_udbinfo);
 832         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 833              inp = LIST_NEXT(inp, inp_list)) {
 834                 INP_WLOCK(inp);
 835                 if (inp->inp_gencnt <= gencnt &&
 836                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 837                         in_pcbref(inp);
 838                         inp_list[i++] = inp;
 839                 }
 840                 INP_WUNLOCK(inp);
 841         }
 842         INP_INFO_RUNLOCK(&V_udbinfo);
 843         n = i;
 844
 845         error = 0;
 846         for (i = 0; i < n; i++) {
 847                 inp = inp_list[i];
 848                 INP_RLOCK(inp);
 849                 if (inp->inp_gencnt <= gencnt) {
 850                         struct xinpcb xi;
 851
 852                         bzero(&xi, sizeof(xi));
 853                         xi.xi_len = sizeof xi;
 854                         /* XXX should avoid extra copy */
 855                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 856                         if (inp->inp_socket)
 857                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 858                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 859                         INP_RUNLOCK(inp);
 860                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 861                 } else
 862                         INP_RUNLOCK(inp);
 863         }
 864         INP_INFO_WLOCK(&V_udbinfo);
 865         for (i = 0; i < n; i++) {
 866                 inp = inp_list[i];
 867                 INP_RLOCK(inp);
 868                 if (!in_pcbrele_rlocked(inp))
 869                         INP_RUNLOCK(inp);
 870         }
 871         INP_INFO_WUNLOCK(&V_udbinfo);
 872
 873         if (!error) {
 874                 /*
 875                  * Give the user an updated idea of our state.  If the
 876                  * generation differs from what we told her before, she knows
 877                  * that something happened while we were processing this
 878                  * request, and it might be necessary to retry.
 879                  */
 880                 INP_INFO_RLOCK(&V_udbinfo);
 881                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 882                 xig.xig_sogen = so_gencnt;
 883                 xig.xig_count = V_udbinfo.ipi_count;
 884                 INP_INFO_RUNLOCK(&V_udbinfo);
 885                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 886         }
 887         free(inp_list, M_TEMP);
 888         return (error);
 889 }
 890
 891 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 892     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 893     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 894
 895 #ifdef INET
 896 static int
 897 udp_getcred(SYSCTL_HANDLER_ARGS)
 898 {
 899         struct xucred xuc;
 900         struct sockaddr_in addrs[2];
 901         struct inpcb *inp;
 902         int error;
 903
 904         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 905         if (error)
 906                 return (error);
 907         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 908         if (error)
 909                 return (error);
 910         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 911             addrs[0].sin_addr, addrs[0].sin_port,
 912             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 913         if (inp != NULL) {
 914                 INP_RLOCK_ASSERT(inp);
 915                 if (inp->inp_socket == NULL)
 916                         error = ENOENT;
 917                 if (error == 0)
 918                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 919                 if (error == 0)
 920                         cru2x(inp->inp_cred, &xuc);
 921                 INP_RUNLOCK(inp);
 922         } else
 923                 error = ENOENT;
 924         if (error == 0)
 925                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 926         return (error);
 927 }
 928
 929 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 930     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 931     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 932 #endif /* INET */
 933
 934 int
 935 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 936 {
 937         struct inpcb *inp;
 938         struct udpcb *up;
 939         int isudplite, error, optval;
 940
 941         error = 0;
 942         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 943         inp = sotoinpcb(so);
 944         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 945         INP_WLOCK(inp);
 946         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 947 #ifdef INET6
 948                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 949                         INP_WUNLOCK(inp);
 950                         error = ip6_ctloutput(so, sopt);
 951                 }
 952 #endif
 953 #if defined(INET) && defined(INET6)
 954                 else
 955 #endif
 956 #ifdef INET
 957                 {
 958                         INP_WUNLOCK(inp);
 959                         error = ip_ctloutput(so, sopt);
 960                 }
 961 #endif
 962                 return (error);
 963         }
 964
 965         switch (sopt->sopt_dir) {
 966         case SOPT_SET:
 967                 switch (sopt->sopt_name) {
 968                 case UDP_ENCAP:
 969                         INP_WUNLOCK(inp);
 970                         error = sooptcopyin(sopt, &optval, sizeof optval,
 971                                             sizeof optval);
 972                         if (error)
 973                                 break;
 974                         inp = sotoinpcb(so);
 975                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 976                         INP_WLOCK(inp);
 977 #ifdef IPSEC_NAT_T
 978                         up = intoudpcb(inp);
 979                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 980 #endif
 981                         switch (optval) {
 982                         case 0:
 983                                 /* Clear all UDP encap. */
 984 #ifdef IPSEC_NAT_T
 985                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 986 #endif
 987                                 break;
 988 #ifdef IPSEC_NAT_T
 989                         case UDP_ENCAP_ESPINUDP:
 990                         case UDP_ENCAP_ESPINUDP_NON_IKE:
 991                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 992                                 if (optval == UDP_ENCAP_ESPINUDP)
 993                                         up->u_flags |= UF_ESPINUDP;
 994                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
 995                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
 996                                 break;
 997 #endif
 998                         default:
 999                                 error = EINVAL;
1000                                 break;
1001                         }
1002                         INP_WUNLOCK(inp);
1003                         break;
1004                 case UDPLITE_SEND_CSCOV:
1005                 case UDPLITE_RECV_CSCOV:
1006                         if (!isudplite) {
1007                                 INP_WUNLOCK(inp);
1008                                 error = ENOPROTOOPT;
1009                                 break;
1010                         }
1011                         INP_WUNLOCK(inp);
1012                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1013                             sizeof(optval));
1014                         if (error != 0)
1015                                 break;
1016                         inp = sotoinpcb(so);
1017                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1018                         INP_WLOCK(inp);
1019                         up = intoudpcb(inp);
1020                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1021                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1022                                 INP_WUNLOCK(inp);
1023                                 error = EINVAL;
1024                                 break;
1025                         }
1026                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1027                                 up->u_txcslen = optval;
1028                         else
1029                                 up->u_rxcslen = optval;
1030                         INP_WUNLOCK(inp);
1031                         break;
1032                 default:
1033                         INP_WUNLOCK(inp);
1034                         error = ENOPROTOOPT;
1035                         break;
1036                 }
1037                 break;
1038         case SOPT_GET:
1039                 switch (sopt->sopt_name) {
1040 #ifdef IPSEC_NAT_T
1041                 case UDP_ENCAP:
1042                         up = intoudpcb(inp);
1043                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1044                         optval = up->u_flags & UF_ESPINUDP_ALL;
1045                         INP_WUNLOCK(inp);
1046                         error = sooptcopyout(sopt, &optval, sizeof optval);
1047                         break;
1048 #endif
1049                 case UDPLITE_SEND_CSCOV:
1050                 case UDPLITE_RECV_CSCOV:
1051                         if (!isudplite) {
1052                                 INP_WUNLOCK(inp);
1053                                 error = ENOPROTOOPT;
1054                                 break;
1055                         }
1056                         up = intoudpcb(inp);
1057                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1058                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1059                                 optval = up->u_txcslen;
1060                         else
1061                                 optval = up->u_rxcslen;
1062                         INP_WUNLOCK(inp);
1063                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1064                         break;
1065                 default:
1066                         INP_WUNLOCK(inp);
1067                         error = ENOPROTOOPT;
1068                         break;
1069                 }
1070                 break;
1071         }
1072         return (error);
1073 }
1074
1075 #ifdef INET
1076 #define UH_WLOCKED      2
1077 #define UH_RLOCKED      1
1078 #define UH_UNLOCKED     0
1079 static int
1080 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1081     struct mbuf *control, struct thread *td)
1082 {
1083         struct udpiphdr *ui;
1084         int len = m->m_pkthdr.len;
1085         struct in_addr faddr, laddr;
1086         struct cmsghdr *cm;
1087         struct inpcbinfo *pcbinfo;
1088         struct sockaddr_in *sin, src;
1089         int cscov_partial = 0;
1090         int error = 0;
1091         int ipflags;
1092         u_short fport, lport;
1093         int unlock_udbinfo;
1094         u_char tos;
1095         uint8_t pr;
1096         uint16_t cscov = 0;
1097
1098         /*
1099          * udp_output() may need to temporarily bind or connect the current
1100          * inpcb.  As such, we don't know up front whether we will need the
1101          * pcbinfo lock or not.  Do any work to decide what is needed up
1102          * front before acquiring any locks.
1103          */
1104         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1105                 if (control)
1106                         m_freem(control);
1107                 m_freem(m);
1108                 return (EMSGSIZE);
1109         }
1110
1111         src.sin_family = 0;
1112         INP_RLOCK(inp);
1113         tos = inp->inp_ip_tos;
1114         if (control != NULL) {
1115                 /*
1116                  * XXX: Currently, we assume all the optional information is
1117                  * stored in a single mbuf.
1118                  */
1119                 if (control->m_next) {
1120                         INP_RUNLOCK(inp);
1121                         m_freem(control);
1122                         m_freem(m);
1123                         return (EINVAL);
1124                 }
1125                 for (; control->m_len > 0;
1126                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1127                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1128                         cm = mtod(control, struct cmsghdr *);
1129                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1130                             || cm->cmsg_len > control->m_len) {
1131                                 error = EINVAL;
1132                                 break;
1133                         }
1134                         if (cm->cmsg_level != IPPROTO_IP)
1135                                 continue;
1136
1137                         switch (cm->cmsg_type) {
1138                         case IP_SENDSRCADDR:
1139                                 if (cm->cmsg_len !=
1140                                     CMSG_LEN(sizeof(struct in_addr))) {
1141                                         error = EINVAL;
1142                                         break;
1143                                 }
1144                                 bzero(&src, sizeof(src));
1145                                 src.sin_family = AF_INET;
1146                                 src.sin_len = sizeof(src);
1147                                 src.sin_port = inp->inp_lport;
1148                                 src.sin_addr =
1149                                     *(struct in_addr *)CMSG_DATA(cm);
1150                                 break;
1151
1152                         case IP_TOS:
1153                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1154                                         error = EINVAL;
1155                                         break;
1156                                 }
1157                                 tos = *(u_char *)CMSG_DATA(cm);
1158                                 break;
1159
1160                         default:
1161                                 error = ENOPROTOOPT;
1162                                 break;
1163                         }
1164                         if (error)
1165                                 break;
1166                 }
1167                 m_freem(control);
1168         }
1169         if (error) {
1170                 INP_RUNLOCK(inp);
1171                 m_freem(m);
1172                 return (error);
1173         }
1174
1175         /*
1176          * Depending on whether or not the application has bound or connected
1177          * the socket, we may have to do varying levels of work.  The optimal
1178          * case is for a connected UDP socket, as a global lock isn't
1179          * required at all.
1180          *
1181          * In order to decide which we need, we require stability of the
1182          * inpcb binding, which we ensure by acquiring a read lock on the
1183          * inpcb.  This doesn't strictly follow the lock order, so we play
1184          * the trylock and retry game; note that we may end up with more
1185          * conservative locks than required the second time around, so later
1186          * assertions have to accept that.  Further analysis of the number of
1187          * misses under contention is required.
1188          *
1189          * XXXRW: Check that hash locking update here is correct.
1190          */
1191         pr = inp->inp_socket->so_proto->pr_protocol;
1192         pcbinfo = get_inpcbinfo(pr);
1193         sin = (struct sockaddr_in *)addr;
1194         if (sin != NULL &&
1195             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1196                 INP_RUNLOCK(inp);
1197                 INP_WLOCK(inp);
1198                 INP_HASH_WLOCK(pcbinfo);
1199                 unlock_udbinfo = UH_WLOCKED;
1200         } else if ((sin != NULL && (
1201             (sin->sin_addr.s_addr == INADDR_ANY) ||
1202             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1203             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1204             (inp->inp_lport == 0))) ||
1205             (src.sin_family == AF_INET)) {
1206                 INP_HASH_RLOCK(pcbinfo);
1207                 unlock_udbinfo = UH_RLOCKED;
1208         } else
1209                 unlock_udbinfo = UH_UNLOCKED;
1210
1211         /*
1212          * If the IP_SENDSRCADDR control message was specified, override the
1213          * source address for this datagram.  Its use is invalidated if the
1214          * address thus specified is incomplete or clobbers other inpcbs.
1215          */
1216         laddr = inp->inp_laddr;
1217         lport = inp->inp_lport;
1218         if (src.sin_family == AF_INET) {
1219                 INP_HASH_LOCK_ASSERT(pcbinfo);
1220                 if ((lport == 0) ||
1221                     (laddr.s_addr == INADDR_ANY &&
1222                      src.sin_addr.s_addr == INADDR_ANY)) {
1223                         error = EINVAL;
1224                         goto release;
1225                 }
1226                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1227                     &laddr.s_addr, &lport, td->td_ucred);
1228                 if (error)
1229                         goto release;
1230         }
1231
1232         /*
1233          * If a UDP socket has been connected, then a local address/port will
1234          * have been selected and bound.
1235          *
1236          * If a UDP socket has not been connected to, then an explicit
1237          * destination address must be used, in which case a local
1238          * address/port may not have been selected and bound.
1239          */
1240         if (sin != NULL) {
1241                 INP_LOCK_ASSERT(inp);
1242                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1243                         error = EISCONN;
1244                         goto release;
1245                 }
1246
1247                 /*
1248                  * Jail may rewrite the destination address, so let it do
1249                  * that before we use it.
1250                  */
1251                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1252                 if (error)
1253                         goto release;
1254
1255                 /*
1256                  * If a local address or port hasn't yet been selected, or if
1257                  * the destination address needs to be rewritten due to using
1258                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1259                  * to do the heavy lifting.  Once a port is selected, we
1260                  * commit the binding back to the socket; we also commit the
1261                  * binding of the address if in jail.
1262                  *
1263                  * If we already have a valid binding and we're not
1264                  * requesting a destination address rewrite, use a fast path.
1265                  */
1266                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1267                     inp->inp_lport == 0 ||
1268                     sin->sin_addr.s_addr == INADDR_ANY ||
1269                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1270                         INP_HASH_LOCK_ASSERT(pcbinfo);
1271                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1272                             &lport, &faddr.s_addr, &fport, NULL,
1273                             td->td_ucred);
1274                         if (error)
1275                                 goto release;
1276
1277                         /*
1278                          * XXXRW: Why not commit the port if the address is
1279                          * !INADDR_ANY?
1280                          */
1281                         /* Commit the local port if newly assigned. */
1282                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1283                             inp->inp_lport == 0) {
1284                                 INP_WLOCK_ASSERT(inp);
1285                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1286                                 /*
1287                                  * Remember addr if jailed, to prevent
1288                                  * rebinding.
1289                                  */
1290                                 if (prison_flag(td->td_ucred, PR_IP4))
1291                                         inp->inp_laddr = laddr;
1292                                 inp->inp_lport = lport;
1293                                 if (in_pcbinshash(inp) != 0) {
1294                                         inp->inp_lport = 0;
1295                                         error = EAGAIN;
1296                                         goto release;
1297                                 }
1298                                 inp->inp_flags |= INP_ANONPORT;
1299                         }
1300                 } else {
1301                         faddr = sin->sin_addr;
1302                         fport = sin->sin_port;
1303                 }
1304         } else {
1305                 INP_LOCK_ASSERT(inp);
1306                 faddr = inp->inp_faddr;
1307                 fport = inp->inp_fport;
1308                 if (faddr.s_addr == INADDR_ANY) {
1309                         error = ENOTCONN;
1310                         goto release;
1311                 }
1312         }
1313
1314         /*
1315          * Calculate data length and get a mbuf for UDP, IP, and possible
1316          * link-layer headers.  Immediate slide the data pointer back forward
1317          * since we won't use that space at this layer.
1318          */
1319         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1320         if (m == NULL) {
1321                 error = ENOBUFS;
1322                 goto release;
1323         }
1324         m->m_data += max_linkhdr;
1325         m->m_len -= max_linkhdr;
1326         m->m_pkthdr.len -= max_linkhdr;
1327
1328         /*
1329          * Fill in mbuf with extended UDP header and addresses and length put
1330          * into network format.
1331          */
1332         ui = mtod(m, struct udpiphdr *);
1333         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1334         ui->ui_pr = pr;
1335         ui->ui_src = laddr;
1336         ui->ui_dst = faddr;
1337         ui->ui_sport = lport;
1338         ui->ui_dport = fport;
1339         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1340         if (pr == IPPROTO_UDPLITE) {
1341                 struct udpcb *up;
1342                 uint16_t plen;
1343
1344                 up = intoudpcb(inp);
1345                 cscov = up->u_txcslen;
1346                 plen = (u_short)len + sizeof(struct udphdr);
1347                 if (cscov >= plen)
1348                         cscov = 0;
1349                 ui->ui_len = htons(plen);
1350                 ui->ui_ulen = htons(cscov);
1351                 /*
1352                  * For UDP-Lite, checksum coverage length of zero means
1353                  * the entire UDPLite packet is covered by the checksum.
1354                  */
1355                 cscov_partial = (cscov == 0) ? 0 : 1;
1356         } else
1357                 ui->ui_v = IPVERSION << 4;
1358
1359         /*
1360          * Set the Don't Fragment bit in the IP header.
1361          */
1362         if (inp->inp_flags & INP_DONTFRAG) {
1363                 struct ip *ip;
1364
1365                 ip = (struct ip *)&ui->ui_i;
1366                 ip->ip_off |= htons(IP_DF);
1367         }
1368
1369         ipflags = 0;
1370         if (inp->inp_socket->so_options & SO_DONTROUTE)
1371                 ipflags |= IP_ROUTETOIF;
1372         if (inp->inp_socket->so_options & SO_BROADCAST)
1373                 ipflags |= IP_ALLOWBROADCAST;
1374         if (inp->inp_flags & INP_ONESBCAST)
1375                 ipflags |= IP_SENDONES;
1376
1377 #ifdef MAC
1378         mac_inpcb_create_mbuf(inp, m);
1379 #endif
1380
1381         /*
1382          * Set up checksum and output datagram.
1383          */
1384         ui->ui_sum = 0;
1385         if (pr == IPPROTO_UDPLITE) {
1386                 if (inp->inp_flags & INP_ONESBCAST)
1387                         faddr.s_addr = INADDR_BROADCAST;
1388                 if (cscov_partial) {
1389                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1390                                 ui->ui_sum = 0xffff;
1391                 } else {
1392                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1393                                 ui->ui_sum = 0xffff;
1394                 }
1395         } else if (V_udp_cksum) {
1396                 if (inp->inp_flags & INP_ONESBCAST)
1397                         faddr.s_addr = INADDR_BROADCAST;
1398                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1399                     htons((u_short)len + sizeof(struct udphdr) + pr));
1400                 m->m_pkthdr.csum_flags = CSUM_UDP;
1401                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1402         }
1403         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1404         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1405         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1406         UDPSTAT_INC(udps_opackets);
1407
1408         if (unlock_udbinfo == UH_WLOCKED)
1409                 INP_HASH_WUNLOCK(pcbinfo);
1410         else if (unlock_udbinfo == UH_RLOCKED)
1411                 INP_HASH_RUNLOCK(pcbinfo);
1412         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1413         error = ip_output(m, inp->inp_options, NULL, ipflags,
1414             inp->inp_moptions, inp);
1415         if (unlock_udbinfo == UH_WLOCKED)
1416                 INP_WUNLOCK(inp);
1417         else
1418                 INP_RUNLOCK(inp);
1419         return (error);
1420
1421 release:
1422         if (unlock_udbinfo == UH_WLOCKED) {
1423                 INP_HASH_WUNLOCK(pcbinfo);
1424                 INP_WUNLOCK(inp);
1425         } else if (unlock_udbinfo == UH_RLOCKED) {
1426                 INP_HASH_RUNLOCK(pcbinfo);
1427                 INP_RUNLOCK(inp);
1428         } else
1429                 INP_RUNLOCK(inp);
1430         m_freem(m);
1431         return (error);
1432 }
1433
1434
1435 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1436 /*
1437  * Potentially decap ESP in UDP frame.  Check for an ESP header
1438  * and optional marker; if present, strip the UDP header and
1439  * push the result through IPSec.
1440  *
1441  * Returns mbuf to be processed (potentially re-allocated) or
1442  * NULL if consumed and/or processed.
1443  */
1444 static struct mbuf *
1445 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1446 {
1447         size_t minlen, payload, skip, iphlen;
1448         caddr_t data;
1449         struct udpcb *up;
1450         struct m_tag *tag;
1451         struct udphdr *udphdr;
1452         struct ip *ip;
1453
1454         INP_RLOCK_ASSERT(inp);
1455
1456         /*
1457          * Pull up data so the longest case is contiguous:
1458          *    IP/UDP hdr + non ESP marker + ESP hdr.
1459          */
1460         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1461         if (minlen > m->m_pkthdr.len)
1462                 minlen = m->m_pkthdr.len;
1463         if ((m = m_pullup(m, minlen)) == NULL) {
1464                 IPSECSTAT_INC(ips_in_inval);
1465                 return (NULL);          /* Bypass caller processing. */
1466         }
1467         data = mtod(m, caddr_t);        /* Points to ip header. */
1468         payload = m->m_len - off;       /* Size of payload. */
1469
1470         if (payload == 1 && data[off] == '\xff')
1471                 return (m);             /* NB: keepalive packet, no decap. */
1472
1473         up = intoudpcb(inp);
1474         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1475         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1476             ("u_flags 0x%x", up->u_flags));
1477
1478         /*
1479          * Check that the payload is large enough to hold an
1480          * ESP header and compute the amount of data to remove.
1481          *
1482          * NB: the caller has already done a pullup for us.
1483          * XXX can we assume alignment and eliminate bcopys?
1484          */
1485         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1486                 /*
1487                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1488                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1489                  * possible AH mode non-IKE marker+non-ESP marker
1490                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1491                  */
1492                 uint64_t marker;
1493
1494                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1495                         return (m);     /* NB: no decap. */
1496                 bcopy(data + off, &marker, sizeof(uint64_t));
1497                 if (marker != 0)        /* Non-IKE marker. */
1498                         return (m);     /* NB: no decap. */
1499                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1500         } else {
1501                 uint32_t spi;
1502
1503                 if (payload <= sizeof(struct esp)) {
1504                         IPSECSTAT_INC(ips_in_inval);
1505                         m_freem(m);
1506                         return (NULL);  /* Discard. */
1507                 }
1508                 bcopy(data + off, &spi, sizeof(uint32_t));
1509                 if (spi == 0)           /* Non-ESP marker. */
1510                         return (m);     /* NB: no decap. */
1511                 skip = sizeof(struct udphdr);
1512         }
1513
1514         /*
1515          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1516          * the UDP ports. This is required if we want to select
1517          * the right SPD for multiple hosts behind same NAT.
1518          *
1519          * NB: ports are maintained in network byte order everywhere
1520          *     in the NAT-T code.
1521          */
1522         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1523                 2 * sizeof(uint16_t), M_NOWAIT);
1524         if (tag == NULL) {
1525                 IPSECSTAT_INC(ips_in_nomem);
1526                 m_freem(m);
1527                 return (NULL);          /* Discard. */
1528         }
1529         iphlen = off - sizeof(struct udphdr);
1530         udphdr = (struct udphdr *)(data + iphlen);
1531         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1532         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1533         m_tag_prepend(m, tag);
1534
1535         /*
1536          * Remove the UDP header (and possibly the non ESP marker)
1537          * IP header length is iphlen
1538          * Before:
1539          *   <--- off --->
1540          *   +----+------+-----+
1541          *   | IP |  UDP | ESP |
1542          *   +----+------+-----+
1543          *        <-skip->
1544          * After:
1545          *          +----+-----+
1546          *          | IP | ESP |
1547          *          +----+-----+
1548          *   <-skip->
1549          */
1550         ovbcopy(data, data + skip, iphlen);
1551         m_adj(m, skip);
1552
1553         ip = mtod(m, struct ip *);
1554         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1555         ip->ip_p = IPPROTO_ESP;
1556
1557         /*
1558          * We cannot yet update the cksums so clear any
1559          * h/w cksum flags as they are no longer valid.
1560          */
1561         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1562                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1563
1564         (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1565         return (NULL);                  /* NB: consumed, bypass processing. */
1566 }
1567 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1568
1569 static void
1570 udp_abort(struct socket *so)
1571 {
1572         struct inpcb *inp;
1573         struct inpcbinfo *pcbinfo;
1574
1575         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1576         inp = sotoinpcb(so);
1577         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1578         INP_WLOCK(inp);
1579         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1580                 INP_HASH_WLOCK(pcbinfo);
1581                 in_pcbdisconnect(inp);
1582                 inp->inp_laddr.s_addr = INADDR_ANY;
1583                 INP_HASH_WUNLOCK(pcbinfo);
1584                 soisdisconnected(so);
1585         }
1586         INP_WUNLOCK(inp);
1587 }
1588
1589 static int
1590 udp_attach(struct socket *so, int proto, struct thread *td)
1591 {
1592         struct inpcb *inp;
1593         struct inpcbinfo *pcbinfo;
1594         int error;
1595
1596         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1597         inp = sotoinpcb(so);
1598         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1599         error = soreserve(so, udp_sendspace, udp_recvspace);
1600         if (error)
1601                 return (error);
1602         INP_INFO_WLOCK(pcbinfo);
1603         error = in_pcballoc(so, pcbinfo);
1604         if (error) {
1605                 INP_INFO_WUNLOCK(pcbinfo);
1606                 return (error);
1607         }
1608
1609         inp = sotoinpcb(so);
1610         inp->inp_vflag |= INP_IPV4;
1611         inp->inp_ip_ttl = V_ip_defttl;
1612
1613         error = udp_newudpcb(inp);
1614         if (error) {
1615                 in_pcbdetach(inp);
1616                 in_pcbfree(inp);
1617                 INP_INFO_WUNLOCK(pcbinfo);
1618                 return (error);
1619         }
1620
1621         INP_WUNLOCK(inp);
1622         INP_INFO_WUNLOCK(pcbinfo);
1623         return (0);
1624 }
1625 #endif /* INET */
1626
1627 int
1628 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, void *ctx)
1629 {
1630         struct inpcb *inp;
1631         struct udpcb *up;
1632
1633         KASSERT(so->so_type == SOCK_DGRAM,
1634             ("udp_set_kernel_tunneling: !dgram"));
1635         inp = sotoinpcb(so);
1636         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1637         INP_WLOCK(inp);
1638         up = intoudpcb(inp);
1639         if (up->u_tun_func != NULL) {
1640                 INP_WUNLOCK(inp);
1641                 return (EBUSY);
1642         }
1643         up->u_tun_func = f;
1644         up->u_tun_ctx = ctx;
1645         INP_WUNLOCK(inp);
1646         return (0);
1647 }
1648
1649 #ifdef INET
1650 static int
1651 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1652 {
1653         struct inpcb *inp;
1654         struct inpcbinfo *pcbinfo;
1655         int error;
1656
1657         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1658         inp = sotoinpcb(so);
1659         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1660         INP_WLOCK(inp);
1661         INP_HASH_WLOCK(pcbinfo);
1662         error = in_pcbbind(inp, nam, td->td_ucred);
1663         INP_HASH_WUNLOCK(pcbinfo);
1664         INP_WUNLOCK(inp);
1665         return (error);
1666 }
1667
1668 static void
1669 udp_close(struct socket *so)
1670 {
1671         struct inpcb *inp;
1672         struct inpcbinfo *pcbinfo;
1673
1674         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1675         inp = sotoinpcb(so);
1676         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1677         INP_WLOCK(inp);
1678         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1679                 INP_HASH_WLOCK(pcbinfo);
1680                 in_pcbdisconnect(inp);
1681                 inp->inp_laddr.s_addr = INADDR_ANY;
1682                 INP_HASH_WUNLOCK(pcbinfo);
1683                 soisdisconnected(so);
1684         }
1685         INP_WUNLOCK(inp);
1686 }
1687
1688 static int
1689 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1690 {
1691         struct inpcb *inp;
1692         struct inpcbinfo *pcbinfo;
1693         struct sockaddr_in *sin;
1694         int error;
1695
1696         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1697         inp = sotoinpcb(so);
1698         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1699         INP_WLOCK(inp);
1700         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1701                 INP_WUNLOCK(inp);
1702                 return (EISCONN);
1703         }
1704         sin = (struct sockaddr_in *)nam;
1705         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1706         if (error != 0) {
1707                 INP_WUNLOCK(inp);
1708                 return (error);
1709         }
1710         INP_HASH_WLOCK(pcbinfo);
1711         error = in_pcbconnect(inp, nam, td->td_ucred);
1712         INP_HASH_WUNLOCK(pcbinfo);
1713         if (error == 0)
1714                 soisconnected(so);
1715         INP_WUNLOCK(inp);
1716         return (error);
1717 }
1718
1719 static void
1720 udp_detach(struct socket *so)
1721 {
1722         struct inpcb *inp;
1723         struct inpcbinfo *pcbinfo;
1724         struct udpcb *up;
1725
1726         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1727         inp = sotoinpcb(so);
1728         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1729         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1730             ("udp_detach: not disconnected"));
1731         INP_INFO_WLOCK(pcbinfo);
1732         INP_WLOCK(inp);
1733         up = intoudpcb(inp);
1734         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1735         inp->inp_ppcb = NULL;
1736         in_pcbdetach(inp);
1737         in_pcbfree(inp);
1738         INP_INFO_WUNLOCK(pcbinfo);
1739         udp_discardcb(up);
1740 }
1741
1742 static int
1743 udp_disconnect(struct socket *so)
1744 {
1745         struct inpcb *inp;
1746         struct inpcbinfo *pcbinfo;
1747
1748         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1749         inp = sotoinpcb(so);
1750         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1751         INP_WLOCK(inp);
1752         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1753                 INP_WUNLOCK(inp);
1754                 return (ENOTCONN);
1755         }
1756         INP_HASH_WLOCK(pcbinfo);
1757         in_pcbdisconnect(inp);
1758         inp->inp_laddr.s_addr = INADDR_ANY;
1759         INP_HASH_WUNLOCK(pcbinfo);
1760         SOCK_LOCK(so);
1761         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1762         SOCK_UNLOCK(so);
1763         INP_WUNLOCK(inp);
1764         return (0);
1765 }
1766
1767 static int
1768 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1769     struct mbuf *control, struct thread *td)
1770 {
1771         struct inpcb *inp;
1772
1773         inp = sotoinpcb(so);
1774         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1775         return (udp_output(inp, m, addr, control, td));
1776 }
1777 #endif /* INET */
1778
1779 int
1780 udp_shutdown(struct socket *so)
1781 {
1782         struct inpcb *inp;
1783
1784         inp = sotoinpcb(so);
1785         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1786         INP_WLOCK(inp);
1787         socantsendmore(so);
1788         INP_WUNLOCK(inp);
1789         return (0);
1790 }
1791
1792 #ifdef INET
1793 struct pr_usrreqs udp_usrreqs = {
1794         .pru_abort =            udp_abort,
1795         .pru_attach =           udp_attach,
1796         .pru_bind =             udp_bind,
1797         .pru_connect =          udp_connect,
1798         .pru_control =          in_control,
1799         .pru_detach =           udp_detach,
1800         .pru_disconnect =       udp_disconnect,
1801         .pru_peeraddr =         in_getpeeraddr,
1802         .pru_send =             udp_send,
1803         .pru_soreceive =        soreceive_dgram,
1804         .pru_sosend =           sosend_dgram,
1805         .pru_shutdown =         udp_shutdown,
1806         .pru_sockaddr =         in_getsockaddr,
1807         .pru_sosetlabel =       in_pcbsosetlabel,
1808         .pru_close =            udp_close,
1809 };
1810 #endif /* INET */