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);
 307                 return;
 308         }
 309
 310         off += sizeof(struct udphdr);
 311
 312 #ifdef IPSEC
 313         /* Check AH/ESP integrity. */
 314         if (ipsec4_in_reject(n, inp)) {
 315                 m_freem(n);
 316                 IPSECSTAT_INC(ips_in_polvio);
 317                 return;
 318         }
 319 #ifdef IPSEC_NAT_T
 320         up = intoudpcb(inp);
 321         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 322         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 323                 n = udp4_espdecap(inp, n, off);
 324                 if (n == NULL)                          /* Consumed. */
 325                         return;
 326         }
 327 #endif /* IPSEC_NAT_T */
 328 #endif /* IPSEC */
 329 #ifdef MAC
 330         if (mac_inpcb_check_deliver(inp, n) != 0) {
 331                 m_freem(n);
 332                 return;
 333         }
 334 #endif /* MAC */
 335         if (inp->inp_flags & INP_CONTROLOPTS ||
 336             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 337 #ifdef INET6
 338                 if (inp->inp_vflag & INP_IPV6)
 339                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 340                 else
 341 #endif /* INET6 */
 342                         ip_savecontrol(inp, &opts, ip, n);
 343         }
 344 #ifdef INET6
 345         if (inp->inp_vflag & INP_IPV6) {
 346                 bzero(&udp_in6, sizeof(udp_in6));
 347                 udp_in6.sin6_len = sizeof(udp_in6);
 348                 udp_in6.sin6_family = AF_INET6;
 349                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 350                 append_sa = (struct sockaddr *)&udp_in6;
 351         } else
 352 #endif /* INET6 */
 353                 append_sa = (struct sockaddr *)udp_in;
 354         m_adj(n, off);
 355
 356         so = inp->inp_socket;
 357         SOCKBUF_LOCK(&so->so_rcv);
 358         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 359                 SOCKBUF_UNLOCK(&so->so_rcv);
 360                 m_freem(n);
 361                 if (opts)
 362                         m_freem(opts);
 363                 UDPSTAT_INC(udps_fullsock);
 364         } else
 365                 sorwakeup_locked(so);
 366 }
 367
 368 void
 369 udp_input(struct mbuf *m, int off)
 370 {
 371         int iphlen = off;
 372         struct ip *ip;
 373         struct udphdr *uh;
 374         struct ifnet *ifp;
 375         struct inpcb *inp;
 376         uint16_t len, ip_len;
 377         struct inpcbinfo *pcbinfo;
 378         struct ip save_ip;
 379         struct sockaddr_in udp_in;
 380         struct m_tag *fwd_tag;
 381         int cscov_partial;
 382         uint8_t pr;
 383
 384         ifp = m->m_pkthdr.rcvif;
 385         UDPSTAT_INC(udps_ipackets);
 386
 387         /*
 388          * Strip IP options, if any; should skip this, make available to
 389          * user, and use on returned packets, but we don't yet have a way to
 390          * check the checksum with options still present.
 391          */
 392         if (iphlen > sizeof (struct ip)) {
 393                 ip_stripoptions(m);
 394                 iphlen = sizeof(struct ip);
 395         }
 396
 397         /*
 398          * Get IP and UDP header together in first mbuf.
 399          */
 400         ip = mtod(m, struct ip *);
 401         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 402                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 403                         UDPSTAT_INC(udps_hdrops);
 404                         return;
 405                 }
 406                 ip = mtod(m, struct ip *);
 407         }
 408         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 409         pr = ip->ip_p;
 410         cscov_partial = (pr == IPPROTO_UDPLITE) ? 1 : 0;
 411
 412         /*
 413          * Destination port of 0 is illegal, based on RFC768.
 414          */
 415         if (uh->uh_dport == 0)
 416                 goto badunlocked;
 417
 418         /*
 419          * Construct sockaddr format source address.  Stuff source address
 420          * and datagram in user buffer.
 421          */
 422         bzero(&udp_in, sizeof(udp_in));
 423         udp_in.sin_len = sizeof(udp_in);
 424         udp_in.sin_family = AF_INET;
 425         udp_in.sin_port = uh->uh_sport;
 426         udp_in.sin_addr = ip->ip_src;
 427
 428         /*
 429          * Make mbuf data length reflect UDP length.  If not enough data to
 430          * reflect UDP length, drop.
 431          */
 432         len = ntohs((u_short)uh->uh_ulen);
 433         ip_len = ntohs(ip->ip_len) - iphlen;
 434         if (pr == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 435                 /* Zero means checksum over the complete packet. */
 436                 if (len == 0)
 437                         len = ip_len;
 438                 cscov_partial = 0;
 439         }
 440         if (ip_len != len) {
 441                 if (len > ip_len || len < sizeof(struct udphdr)) {
 442                         UDPSTAT_INC(udps_badlen);
 443                         goto badunlocked;
 444                 }
 445                 if (pr == IPPROTO_UDP)
 446                         m_adj(m, len - ip_len);
 447         }
 448
 449         /*
 450          * Save a copy of the IP header in case we want restore it for
 451          * sending an ICMP error message in response.
 452          */
 453         if (!V_udp_blackhole)
 454                 save_ip = *ip;
 455         else
 456                 memset(&save_ip, 0, sizeof(save_ip));
 457
 458         /*
 459          * Checksum extended UDP header and data.
 460          */
 461         if (uh->uh_sum) {
 462                 u_short uh_sum;
 463
 464                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 465                     !cscov_partial) {
 466                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 467                                 uh_sum = m->m_pkthdr.csum_data;
 468                         else
 469                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 470                                     ip->ip_dst.s_addr, htonl((u_short)len +
 471                                     m->m_pkthdr.csum_data + pr));
 472                         uh_sum ^= 0xffff;
 473                 } else {
 474                         char b[9];
 475
 476                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 477                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 478                         ((struct ipovly *)ip)->ih_len = (pr == IPPROTO_UDP) ?
 479                             uh->uh_ulen : htons(ip_len);
 480                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 481                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 482                 }
 483                 if (uh_sum) {
 484                         UDPSTAT_INC(udps_badsum);
 485                         m_freem(m);
 486                         return;
 487                 }
 488         } else {
 489                 if (pr == IPPROTO_UDP) {
 490                         UDPSTAT_INC(udps_nosum);
 491                 } else {
 492                         /* UDPLite requires a checksum */
 493                         /* XXX: What is the right UDPLite MIB counter here? */
 494                         m_freem(m);
 495                         return;
 496                 }
 497         }
 498
 499         pcbinfo = get_inpcbinfo(pr);
 500         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 501             in_broadcast(ip->ip_dst, ifp)) {
 502                 struct inpcb *last;
 503                 struct inpcbhead *pcblist;
 504                 struct ip_moptions *imo;
 505
 506                 INP_INFO_RLOCK(pcbinfo);
 507                 pcblist = get_pcblist(pr);
 508                 last = NULL;
 509                 LIST_FOREACH(inp, pcblist, inp_list) {
 510                         if (inp->inp_lport != uh->uh_dport)
 511                                 continue;
 512 #ifdef INET6
 513                         if ((inp->inp_vflag & INP_IPV4) == 0)
 514                                 continue;
 515 #endif
 516                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 517                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 518                                 continue;
 519                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 520                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 521                                 continue;
 522                         if (inp->inp_fport != 0 &&
 523                             inp->inp_fport != uh->uh_sport)
 524                                 continue;
 525
 526                         INP_RLOCK(inp);
 527
 528                         /*
 529                          * XXXRW: Because we weren't holding either the inpcb
 530                          * or the hash lock when we checked for a match
 531                          * before, we should probably recheck now that the
 532                          * inpcb lock is held.
 533                          */
 534
 535                         /*
 536                          * Handle socket delivery policy for any-source
 537                          * and source-specific multicast. [RFC3678]
 538                          */
 539                         imo = inp->inp_moptions;
 540                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 541                                 struct sockaddr_in       group;
 542                                 int                      blocked;
 543                                 if (imo == NULL) {
 544                                         INP_RUNLOCK(inp);
 545                                         continue;
 546                                 }
 547                                 bzero(&group, sizeof(struct sockaddr_in));
 548                                 group.sin_len = sizeof(struct sockaddr_in);
 549                                 group.sin_family = AF_INET;
 550                                 group.sin_addr = ip->ip_dst;
 551
 552                                 blocked = imo_multi_filter(imo, ifp,
 553                                         (struct sockaddr *)&group,
 554                                         (struct sockaddr *)&udp_in);
 555                                 if (blocked != MCAST_PASS) {
 556                                         if (blocked == MCAST_NOTGMEMBER)
 557                                                 IPSTAT_INC(ips_notmember);
 558                                         if (blocked == MCAST_NOTSMEMBER ||
 559                                             blocked == MCAST_MUTED)
 560                                                 UDPSTAT_INC(udps_filtermcast);
 561                                         INP_RUNLOCK(inp);
 562                                         continue;
 563                                 }
 564                         }
 565                         if (last != NULL) {
 566                                 struct mbuf *n;
 567
 568                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 569                                         UDP_PROBE(receive, NULL, last, ip,
 570                                             last, uh);
 571                                         udp_append(last, ip, n, iphlen,
 572                                             &udp_in);
 573                                 }
 574                                 INP_RUNLOCK(last);
 575                         }
 576                         last = inp;
 577                         /*
 578                          * Don't look for additional matches if this one does
 579                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 580                          * socket options set.  This heuristic avoids
 581                          * searching through all pcbs in the common case of a
 582                          * non-shared port.  It assumes that an application
 583                          * will never clear these options after setting them.
 584                          */
 585                         if ((last->inp_socket->so_options &
 586                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 587                                 break;
 588                 }
 589
 590                 if (last == NULL) {
 591                         /*
 592                          * No matching pcb found; discard datagram.  (No need
 593                          * to send an ICMP Port Unreachable for a broadcast
 594                          * or multicast datgram.)
 595                          */
 596                         UDPSTAT_INC(udps_noportbcast);
 597                         if (inp)
 598                                 INP_RUNLOCK(inp);
 599                         INP_INFO_RUNLOCK(pcbinfo);
 600                         goto badunlocked;
 601                 }
 602                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 603                 udp_append(last, ip, m, iphlen, &udp_in);
 604                 INP_RUNLOCK(last);
 605                 INP_INFO_RUNLOCK(pcbinfo);
 606                 return;
 607         }
 608
 609         /*
 610          * Locate pcb for datagram.
 611          */
 612
 613         /*
 614          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 615          */
 616         if ((m->m_flags & M_IP_NEXTHOP) &&
 617             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 618                 struct sockaddr_in *next_hop;
 619
 620                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 621
 622                 /*
 623                  * Transparently forwarded. Pretend to be the destination.
 624                  * Already got one like this?
 625                  */
 626                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 627                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 628                 if (!inp) {
 629                         /*
 630                          * It's new.  Try to find the ambushing socket.
 631                          * Because we've rewritten the destination address,
 632                          * any hardware-generated hash is ignored.
 633                          */
 634                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 635                             uh->uh_sport, next_hop->sin_addr,
 636                             next_hop->sin_port ? htons(next_hop->sin_port) :
 637                             uh->uh_dport, INPLOOKUP_WILDCARD |
 638                             INPLOOKUP_RLOCKPCB, ifp);
 639                 }
 640                 /* Remove the tag from the packet. We don't need it anymore. */
 641                 m_tag_delete(m, fwd_tag);
 642                 m->m_flags &= ~M_IP_NEXTHOP;
 643         } else
 644                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 645                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 646                     INPLOOKUP_RLOCKPCB, ifp, m);
 647         if (inp == NULL) {
 648                 if (udp_log_in_vain) {
 649                         char buf[4*sizeof "123"];
 650
 651                         strcpy(buf, inet_ntoa(ip->ip_dst));
 652                         log(LOG_INFO,
 653                             "Connection attempt to UDP %s:%d from %s:%d\n",
 654                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 655                             ntohs(uh->uh_sport));
 656                 }
 657                 UDPSTAT_INC(udps_noport);
 658                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 659                         UDPSTAT_INC(udps_noportbcast);
 660                         goto badunlocked;
 661                 }
 662                 if (V_udp_blackhole)
 663                         goto badunlocked;
 664                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 665                         goto badunlocked;
 666                 *ip = save_ip;
 667                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 668                 return;
 669         }
 670
 671         /*
 672          * Check the minimum TTL for socket.
 673          */
 674         INP_RLOCK_ASSERT(inp);
 675         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 676                 INP_RUNLOCK(inp);
 677                 m_freem(m);
 678                 return;
 679         }
 680         if (cscov_partial) {
 681                 struct udpcb *up;
 682
 683                 up = intoudpcb(inp);
 684                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 685                         INP_RUNLOCK(inp);
 686                         m_freem(m);
 687                         return;
 688                 }
 689         }
 690
 691         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 692         udp_append(inp, ip, m, iphlen, &udp_in);
 693         INP_RUNLOCK(inp);
 694         return;
 695
 696 badunlocked:
 697         m_freem(m);
 698 }
 699 #endif /* INET */
 700
 701 /*
 702  * Notify a udp user of an asynchronous error; just wake up so that they can
 703  * collect error status.
 704  */
 705 struct inpcb *
 706 udp_notify(struct inpcb *inp, int errno)
 707 {
 708
 709         /*
 710          * While udp_ctlinput() always calls udp_notify() with a read lock
 711          * when invoking it directly, in_pcbnotifyall() currently uses write
 712          * locks due to sharing code with TCP.  For now, accept either a read
 713          * or a write lock, but a read lock is sufficient.
 714          */
 715         INP_LOCK_ASSERT(inp);
 716
 717         inp->inp_socket->so_error = errno;
 718         sorwakeup(inp->inp_socket);
 719         sowwakeup(inp->inp_socket);
 720         return (inp);
 721 }
 722
 723 #ifdef INET
 724 static void
 725 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 726     struct inpcbinfo *pcbinfo)
 727 {
 728         struct ip *ip = vip;
 729         struct udphdr *uh;
 730         struct in_addr faddr;
 731         struct inpcb *inp;
 732
 733         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 734         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 735                 return;
 736
 737         /*
 738          * Redirects don't need to be handled up here.
 739          */
 740         if (PRC_IS_REDIRECT(cmd))
 741                 return;
 742
 743         /*
 744          * Hostdead is ugly because it goes linearly through all PCBs.
 745          *
 746          * XXX: We never get this from ICMP, otherwise it makes an excellent
 747          * DoS attack on machines with many connections.
 748          */
 749         if (cmd == PRC_HOSTDEAD)
 750                 ip = NULL;
 751         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 752                 return;
 753         if (ip != NULL) {
 754                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 755                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 756                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 757                 if (inp != NULL) {
 758                         INP_RLOCK_ASSERT(inp);
 759                         if (inp->inp_socket != NULL) {
 760                                 udp_notify(inp, inetctlerrmap[cmd]);
 761                         }
 762                         INP_RUNLOCK(inp);
 763                 }
 764         } else
 765                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 766                     udp_notify);
 767 }
 768 void
 769 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 770 {
 771
 772         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 773 }
 774
 775 void
 776 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 777 {
 778
 779         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 780 }
 781 #endif /* INET */
 782
 783 static int
 784 udp_pcblist(SYSCTL_HANDLER_ARGS)
 785 {
 786         int error, i, n;
 787         struct inpcb *inp, **inp_list;
 788         inp_gen_t gencnt;
 789         struct xinpgen xig;
 790
 791         /*
 792          * The process of preparing the PCB list is too time-consuming and
 793          * resource-intensive to repeat twice on every request.
 794          */
 795         if (req->oldptr == 0) {
 796                 n = V_udbinfo.ipi_count;
 797                 n += imax(n / 8, 10);
 798                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 799                 return (0);
 800         }
 801
 802         if (req->newptr != 0)
 803                 return (EPERM);
 804
 805         /*
 806          * OK, now we're committed to doing something.
 807          */
 808         INP_INFO_RLOCK(&V_udbinfo);
 809         gencnt = V_udbinfo.ipi_gencnt;
 810         n = V_udbinfo.ipi_count;
 811         INP_INFO_RUNLOCK(&V_udbinfo);
 812
 813         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 814                 + n * sizeof(struct xinpcb));
 815         if (error != 0)
 816                 return (error);
 817
 818         xig.xig_len = sizeof xig;
 819         xig.xig_count = n;
 820         xig.xig_gen = gencnt;
 821         xig.xig_sogen = so_gencnt;
 822         error = SYSCTL_OUT(req, &xig, sizeof xig);
 823         if (error)
 824                 return (error);
 825
 826         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 827         if (inp_list == 0)
 828                 return (ENOMEM);
 829
 830         INP_INFO_RLOCK(&V_udbinfo);
 831         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 832              inp = LIST_NEXT(inp, inp_list)) {
 833                 INP_WLOCK(inp);
 834                 if (inp->inp_gencnt <= gencnt &&
 835                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 836                         in_pcbref(inp);
 837                         inp_list[i++] = inp;
 838                 }
 839                 INP_WUNLOCK(inp);
 840         }
 841         INP_INFO_RUNLOCK(&V_udbinfo);
 842         n = i;
 843
 844         error = 0;
 845         for (i = 0; i < n; i++) {
 846                 inp = inp_list[i];
 847                 INP_RLOCK(inp);
 848                 if (inp->inp_gencnt <= gencnt) {
 849                         struct xinpcb xi;
 850
 851                         bzero(&xi, sizeof(xi));
 852                         xi.xi_len = sizeof xi;
 853                         /* XXX should avoid extra copy */
 854                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 855                         if (inp->inp_socket)
 856                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 857                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 858                         INP_RUNLOCK(inp);
 859                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 860                 } else
 861                         INP_RUNLOCK(inp);
 862         }
 863         INP_INFO_WLOCK(&V_udbinfo);
 864         for (i = 0; i < n; i++) {
 865                 inp = inp_list[i];
 866                 INP_RLOCK(inp);
 867                 if (!in_pcbrele_rlocked(inp))
 868                         INP_RUNLOCK(inp);
 869         }
 870         INP_INFO_WUNLOCK(&V_udbinfo);
 871
 872         if (!error) {
 873                 /*
 874                  * Give the user an updated idea of our state.  If the
 875                  * generation differs from what we told her before, she knows
 876                  * that something happened while we were processing this
 877                  * request, and it might be necessary to retry.
 878                  */
 879                 INP_INFO_RLOCK(&V_udbinfo);
 880                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 881                 xig.xig_sogen = so_gencnt;
 882                 xig.xig_count = V_udbinfo.ipi_count;
 883                 INP_INFO_RUNLOCK(&V_udbinfo);
 884                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 885         }
 886         free(inp_list, M_TEMP);
 887         return (error);
 888 }
 889
 890 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 891     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 892     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 893
 894 #ifdef INET
 895 static int
 896 udp_getcred(SYSCTL_HANDLER_ARGS)
 897 {
 898         struct xucred xuc;
 899         struct sockaddr_in addrs[2];
 900         struct inpcb *inp;
 901         int error;
 902
 903         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 904         if (error)
 905                 return (error);
 906         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 907         if (error)
 908                 return (error);
 909         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 910             addrs[0].sin_addr, addrs[0].sin_port,
 911             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 912         if (inp != NULL) {
 913                 INP_RLOCK_ASSERT(inp);
 914                 if (inp->inp_socket == NULL)
 915                         error = ENOENT;
 916                 if (error == 0)
 917                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 918                 if (error == 0)
 919                         cru2x(inp->inp_cred, &xuc);
 920                 INP_RUNLOCK(inp);
 921         } else
 922                 error = ENOENT;
 923         if (error == 0)
 924                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 925         return (error);
 926 }
 927
 928 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 929     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 930     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 931 #endif /* INET */
 932
 933 int
 934 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 935 {
 936         struct inpcb *inp;
 937         struct udpcb *up;
 938         int isudplite, error, optval;
 939
 940         error = 0;
 941         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 942         inp = sotoinpcb(so);
 943         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 944         INP_WLOCK(inp);
 945         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 946 #ifdef INET6
 947                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 948                         INP_WUNLOCK(inp);
 949                         error = ip6_ctloutput(so, sopt);
 950                 }
 951 #endif
 952 #if defined(INET) && defined(INET6)
 953                 else
 954 #endif
 955 #ifdef INET
 956                 {
 957                         INP_WUNLOCK(inp);
 958                         error = ip_ctloutput(so, sopt);
 959                 }
 960 #endif
 961                 return (error);
 962         }
 963
 964         switch (sopt->sopt_dir) {
 965         case SOPT_SET:
 966                 switch (sopt->sopt_name) {
 967                 case UDP_ENCAP:
 968                         INP_WUNLOCK(inp);
 969                         error = sooptcopyin(sopt, &optval, sizeof optval,
 970                                             sizeof optval);
 971                         if (error)
 972                                 break;
 973                         inp = sotoinpcb(so);
 974                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 975                         INP_WLOCK(inp);
 976 #ifdef IPSEC_NAT_T
 977                         up = intoudpcb(inp);
 978                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 979 #endif
 980                         switch (optval) {
 981                         case 0:
 982                                 /* Clear all UDP encap. */
 983 #ifdef IPSEC_NAT_T
 984                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 985 #endif
 986                                 break;
 987 #ifdef IPSEC_NAT_T
 988                         case UDP_ENCAP_ESPINUDP:
 989                         case UDP_ENCAP_ESPINUDP_NON_IKE:
 990                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 991                                 if (optval == UDP_ENCAP_ESPINUDP)
 992                                         up->u_flags |= UF_ESPINUDP;
 993                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
 994                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
 995                                 break;
 996 #endif
 997                         default:
 998                                 error = EINVAL;
 999                                 break;
1000                         }
1001                         INP_WUNLOCK(inp);
1002                         break;
1003                 case UDPLITE_SEND_CSCOV:
1004                 case UDPLITE_RECV_CSCOV:
1005                         if (!isudplite) {
1006                                 INP_WUNLOCK(inp);
1007                                 error = ENOPROTOOPT;
1008                                 break;
1009                         }
1010                         INP_WUNLOCK(inp);
1011                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1012                             sizeof(optval));
1013                         if (error != 0)
1014                                 break;
1015                         inp = sotoinpcb(so);
1016                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1017                         INP_WLOCK(inp);
1018                         up = intoudpcb(inp);
1019                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1020                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1021                                 INP_WUNLOCK(inp);
1022                                 error = EINVAL;
1023                                 break;
1024                         }
1025                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1026                                 up->u_txcslen = optval;
1027                         else
1028                                 up->u_rxcslen = optval;
1029                         INP_WUNLOCK(inp);
1030                         break;
1031                 default:
1032                         INP_WUNLOCK(inp);
1033                         error = ENOPROTOOPT;
1034                         break;
1035                 }
1036                 break;
1037         case SOPT_GET:
1038                 switch (sopt->sopt_name) {
1039 #ifdef IPSEC_NAT_T
1040                 case UDP_ENCAP:
1041                         up = intoudpcb(inp);
1042                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1043                         optval = up->u_flags & UF_ESPINUDP_ALL;
1044                         INP_WUNLOCK(inp);
1045                         error = sooptcopyout(sopt, &optval, sizeof optval);
1046                         break;
1047 #endif
1048                 case UDPLITE_SEND_CSCOV:
1049                 case UDPLITE_RECV_CSCOV:
1050                         if (!isudplite) {
1051                                 INP_WUNLOCK(inp);
1052                                 error = ENOPROTOOPT;
1053                                 break;
1054                         }
1055                         up = intoudpcb(inp);
1056                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1057                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1058                                 optval = up->u_txcslen;
1059                         else
1060                                 optval = up->u_rxcslen;
1061                         INP_WUNLOCK(inp);
1062                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1063                         break;
1064                 default:
1065                         INP_WUNLOCK(inp);
1066                         error = ENOPROTOOPT;
1067                         break;
1068                 }
1069                 break;
1070         }
1071         return (error);
1072 }
1073
1074 #ifdef INET
1075 #define UH_WLOCKED      2
1076 #define UH_RLOCKED      1
1077 #define UH_UNLOCKED     0
1078 static int
1079 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1080     struct mbuf *control, struct thread *td)
1081 {
1082         struct udpiphdr *ui;
1083         int len = m->m_pkthdr.len;
1084         struct in_addr faddr, laddr;
1085         struct cmsghdr *cm;
1086         struct inpcbinfo *pcbinfo;
1087         struct sockaddr_in *sin, src;
1088         int cscov_partial = 0;
1089         int error = 0;
1090         int ipflags;
1091         u_short fport, lport;
1092         int unlock_udbinfo;
1093         u_char tos;
1094         uint8_t pr;
1095         uint16_t cscov = 0;
1096
1097         /*
1098          * udp_output() may need to temporarily bind or connect the current
1099          * inpcb.  As such, we don't know up front whether we will need the
1100          * pcbinfo lock or not.  Do any work to decide what is needed up
1101          * front before acquiring any locks.
1102          */
1103         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1104                 if (control)
1105                         m_freem(control);
1106                 m_freem(m);
1107                 return (EMSGSIZE);
1108         }
1109
1110         src.sin_family = 0;
1111         INP_RLOCK(inp);
1112         tos = inp->inp_ip_tos;
1113         if (control != NULL) {
1114                 /*
1115                  * XXX: Currently, we assume all the optional information is
1116                  * stored in a single mbuf.
1117                  */
1118                 if (control->m_next) {
1119                         INP_RUNLOCK(inp);
1120                         m_freem(control);
1121                         m_freem(m);
1122                         return (EINVAL);
1123                 }
1124                 for (; control->m_len > 0;
1125                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1126                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1127                         cm = mtod(control, struct cmsghdr *);
1128                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1129                             || cm->cmsg_len > control->m_len) {
1130                                 error = EINVAL;
1131                                 break;
1132                         }
1133                         if (cm->cmsg_level != IPPROTO_IP)
1134                                 continue;
1135
1136                         switch (cm->cmsg_type) {
1137                         case IP_SENDSRCADDR:
1138                                 if (cm->cmsg_len !=
1139                                     CMSG_LEN(sizeof(struct in_addr))) {
1140                                         error = EINVAL;
1141                                         break;
1142                                 }
1143                                 bzero(&src, sizeof(src));
1144                                 src.sin_family = AF_INET;
1145                                 src.sin_len = sizeof(src);
1146                                 src.sin_port = inp->inp_lport;
1147                                 src.sin_addr =
1148                                     *(struct in_addr *)CMSG_DATA(cm);
1149                                 break;
1150
1151                         case IP_TOS:
1152                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1153                                         error = EINVAL;
1154                                         break;
1155                                 }
1156                                 tos = *(u_char *)CMSG_DATA(cm);
1157                                 break;
1158
1159                         default:
1160                                 error = ENOPROTOOPT;
1161                                 break;
1162                         }
1163                         if (error)
1164                                 break;
1165                 }
1166                 m_freem(control);
1167         }
1168         if (error) {
1169                 INP_RUNLOCK(inp);
1170                 m_freem(m);
1171                 return (error);
1172         }
1173
1174         /*
1175          * Depending on whether or not the application has bound or connected
1176          * the socket, we may have to do varying levels of work.  The optimal
1177          * case is for a connected UDP socket, as a global lock isn't
1178          * required at all.
1179          *
1180          * In order to decide which we need, we require stability of the
1181          * inpcb binding, which we ensure by acquiring a read lock on the
1182          * inpcb.  This doesn't strictly follow the lock order, so we play
1183          * the trylock and retry game; note that we may end up with more
1184          * conservative locks than required the second time around, so later
1185          * assertions have to accept that.  Further analysis of the number of
1186          * misses under contention is required.
1187          *
1188          * XXXRW: Check that hash locking update here is correct.
1189          */
1190         pr = inp->inp_socket->so_proto->pr_protocol;
1191         pcbinfo = get_inpcbinfo(pr);
1192         sin = (struct sockaddr_in *)addr;
1193         if (sin != NULL &&
1194             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1195                 INP_RUNLOCK(inp);
1196                 INP_WLOCK(inp);
1197                 INP_HASH_WLOCK(pcbinfo);
1198                 unlock_udbinfo = UH_WLOCKED;
1199         } else if ((sin != NULL && (
1200             (sin->sin_addr.s_addr == INADDR_ANY) ||
1201             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1202             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1203             (inp->inp_lport == 0))) ||
1204             (src.sin_family == AF_INET)) {
1205                 INP_HASH_RLOCK(pcbinfo);
1206                 unlock_udbinfo = UH_RLOCKED;
1207         } else
1208                 unlock_udbinfo = UH_UNLOCKED;
1209
1210         /*
1211          * If the IP_SENDSRCADDR control message was specified, override the
1212          * source address for this datagram.  Its use is invalidated if the
1213          * address thus specified is incomplete or clobbers other inpcbs.
1214          */
1215         laddr = inp->inp_laddr;
1216         lport = inp->inp_lport;
1217         if (src.sin_family == AF_INET) {
1218                 INP_HASH_LOCK_ASSERT(pcbinfo);
1219                 if ((lport == 0) ||
1220                     (laddr.s_addr == INADDR_ANY &&
1221                      src.sin_addr.s_addr == INADDR_ANY)) {
1222                         error = EINVAL;
1223                         goto release;
1224                 }
1225                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1226                     &laddr.s_addr, &lport, td->td_ucred);
1227                 if (error)
1228                         goto release;
1229         }
1230
1231         /*
1232          * If a UDP socket has been connected, then a local address/port will
1233          * have been selected and bound.
1234          *
1235          * If a UDP socket has not been connected to, then an explicit
1236          * destination address must be used, in which case a local
1237          * address/port may not have been selected and bound.
1238          */
1239         if (sin != NULL) {
1240                 INP_LOCK_ASSERT(inp);
1241                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1242                         error = EISCONN;
1243                         goto release;
1244                 }
1245
1246                 /*
1247                  * Jail may rewrite the destination address, so let it do
1248                  * that before we use it.
1249                  */
1250                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1251                 if (error)
1252                         goto release;
1253
1254                 /*
1255                  * If a local address or port hasn't yet been selected, or if
1256                  * the destination address needs to be rewritten due to using
1257                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1258                  * to do the heavy lifting.  Once a port is selected, we
1259                  * commit the binding back to the socket; we also commit the
1260                  * binding of the address if in jail.
1261                  *
1262                  * If we already have a valid binding and we're not
1263                  * requesting a destination address rewrite, use a fast path.
1264                  */
1265                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1266                     inp->inp_lport == 0 ||
1267                     sin->sin_addr.s_addr == INADDR_ANY ||
1268                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1269                         INP_HASH_LOCK_ASSERT(pcbinfo);
1270                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1271                             &lport, &faddr.s_addr, &fport, NULL,
1272                             td->td_ucred);
1273                         if (error)
1274                                 goto release;
1275
1276                         /*
1277                          * XXXRW: Why not commit the port if the address is
1278                          * !INADDR_ANY?
1279                          */
1280                         /* Commit the local port if newly assigned. */
1281                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1282                             inp->inp_lport == 0) {
1283                                 INP_WLOCK_ASSERT(inp);
1284                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1285                                 /*
1286                                  * Remember addr if jailed, to prevent
1287                                  * rebinding.
1288                                  */
1289                                 if (prison_flag(td->td_ucred, PR_IP4))
1290                                         inp->inp_laddr = laddr;
1291                                 inp->inp_lport = lport;
1292                                 if (in_pcbinshash(inp) != 0) {
1293                                         inp->inp_lport = 0;
1294                                         error = EAGAIN;
1295                                         goto release;
1296                                 }
1297                                 inp->inp_flags |= INP_ANONPORT;
1298                         }
1299                 } else {
1300                         faddr = sin->sin_addr;
1301                         fport = sin->sin_port;
1302                 }
1303         } else {
1304                 INP_LOCK_ASSERT(inp);
1305                 faddr = inp->inp_faddr;
1306                 fport = inp->inp_fport;
1307                 if (faddr.s_addr == INADDR_ANY) {
1308                         error = ENOTCONN;
1309                         goto release;
1310                 }
1311         }
1312
1313         /*
1314          * Calculate data length and get a mbuf for UDP, IP, and possible
1315          * link-layer headers.  Immediate slide the data pointer back forward
1316          * since we won't use that space at this layer.
1317          */
1318         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1319         if (m == NULL) {
1320                 error = ENOBUFS;
1321                 goto release;
1322         }
1323         m->m_data += max_linkhdr;
1324         m->m_len -= max_linkhdr;
1325         m->m_pkthdr.len -= max_linkhdr;
1326
1327         /*
1328          * Fill in mbuf with extended UDP header and addresses and length put
1329          * into network format.
1330          */
1331         ui = mtod(m, struct udpiphdr *);
1332         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1333         ui->ui_pr = pr;
1334         ui->ui_src = laddr;
1335         ui->ui_dst = faddr;
1336         ui->ui_sport = lport;
1337         ui->ui_dport = fport;
1338         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1339         if (pr == IPPROTO_UDPLITE) {
1340                 struct udpcb *up;
1341                 uint16_t plen;
1342
1343                 up = intoudpcb(inp);
1344                 cscov = up->u_txcslen;
1345                 plen = (u_short)len + sizeof(struct udphdr);
1346                 if (cscov >= plen)
1347                         cscov = 0;
1348                 ui->ui_len = htons(plen);
1349                 ui->ui_ulen = htons(cscov);
1350                 /*
1351                  * For UDP-Lite, checksum coverage length of zero means
1352                  * the entire UDPLite packet is covered by the checksum.
1353                  */
1354                 cscov_partial = (cscov == 0) ? 0 : 1;
1355         } else
1356                 ui->ui_v = IPVERSION << 4;
1357
1358         /*
1359          * Set the Don't Fragment bit in the IP header.
1360          */
1361         if (inp->inp_flags & INP_DONTFRAG) {
1362                 struct ip *ip;
1363
1364                 ip = (struct ip *)&ui->ui_i;
1365                 ip->ip_off |= htons(IP_DF);
1366         }
1367
1368         ipflags = 0;
1369         if (inp->inp_socket->so_options & SO_DONTROUTE)
1370                 ipflags |= IP_ROUTETOIF;
1371         if (inp->inp_socket->so_options & SO_BROADCAST)
1372                 ipflags |= IP_ALLOWBROADCAST;
1373         if (inp->inp_flags & INP_ONESBCAST)
1374                 ipflags |= IP_SENDONES;
1375
1376 #ifdef MAC
1377         mac_inpcb_create_mbuf(inp, m);
1378 #endif
1379
1380         /*
1381          * Set up checksum and output datagram.
1382          */
1383         ui->ui_sum = 0;
1384         if (pr == IPPROTO_UDPLITE) {
1385                 if (inp->inp_flags & INP_ONESBCAST)
1386                         faddr.s_addr = INADDR_BROADCAST;
1387                 if (cscov_partial) {
1388                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1389                                 ui->ui_sum = 0xffff;
1390                 } else {
1391                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1392                                 ui->ui_sum = 0xffff;
1393                 }
1394         } else if (V_udp_cksum) {
1395                 if (inp->inp_flags & INP_ONESBCAST)
1396                         faddr.s_addr = INADDR_BROADCAST;
1397                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1398                     htons((u_short)len + sizeof(struct udphdr) + pr));
1399                 m->m_pkthdr.csum_flags = CSUM_UDP;
1400                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1401         }
1402         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1403         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1404         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1405         UDPSTAT_INC(udps_opackets);
1406
1407         if (unlock_udbinfo == UH_WLOCKED)
1408                 INP_HASH_WUNLOCK(pcbinfo);
1409         else if (unlock_udbinfo == UH_RLOCKED)
1410                 INP_HASH_RUNLOCK(pcbinfo);
1411         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1412         error = ip_output(m, inp->inp_options, NULL, ipflags,
1413             inp->inp_moptions, inp);
1414         if (unlock_udbinfo == UH_WLOCKED)
1415                 INP_WUNLOCK(inp);
1416         else
1417                 INP_RUNLOCK(inp);
1418         return (error);
1419
1420 release:
1421         if (unlock_udbinfo == UH_WLOCKED) {
1422                 INP_HASH_WUNLOCK(pcbinfo);
1423                 INP_WUNLOCK(inp);
1424         } else if (unlock_udbinfo == UH_RLOCKED) {
1425                 INP_HASH_RUNLOCK(pcbinfo);
1426                 INP_RUNLOCK(inp);
1427         } else
1428                 INP_RUNLOCK(inp);
1429         m_freem(m);
1430         return (error);
1431 }
1432
1433
1434 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1435 /*
1436  * Potentially decap ESP in UDP frame.  Check for an ESP header
1437  * and optional marker; if present, strip the UDP header and
1438  * push the result through IPSec.
1439  *
1440  * Returns mbuf to be processed (potentially re-allocated) or
1441  * NULL if consumed and/or processed.
1442  */
1443 static struct mbuf *
1444 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1445 {
1446         size_t minlen, payload, skip, iphlen;
1447         caddr_t data;
1448         struct udpcb *up;
1449         struct m_tag *tag;
1450         struct udphdr *udphdr;
1451         struct ip *ip;
1452
1453         INP_RLOCK_ASSERT(inp);
1454
1455         /*
1456          * Pull up data so the longest case is contiguous:
1457          *    IP/UDP hdr + non ESP marker + ESP hdr.
1458          */
1459         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1460         if (minlen > m->m_pkthdr.len)
1461                 minlen = m->m_pkthdr.len;
1462         if ((m = m_pullup(m, minlen)) == NULL) {
1463                 IPSECSTAT_INC(ips_in_inval);
1464                 return (NULL);          /* Bypass caller processing. */
1465         }
1466         data = mtod(m, caddr_t);        /* Points to ip header. */
1467         payload = m->m_len - off;       /* Size of payload. */
1468
1469         if (payload == 1 && data[off] == '\xff')
1470                 return (m);             /* NB: keepalive packet, no decap. */
1471
1472         up = intoudpcb(inp);
1473         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1474         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1475             ("u_flags 0x%x", up->u_flags));
1476
1477         /*
1478          * Check that the payload is large enough to hold an
1479          * ESP header and compute the amount of data to remove.
1480          *
1481          * NB: the caller has already done a pullup for us.
1482          * XXX can we assume alignment and eliminate bcopys?
1483          */
1484         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1485                 /*
1486                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1487                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1488                  * possible AH mode non-IKE marker+non-ESP marker
1489                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1490                  */
1491                 uint64_t marker;
1492
1493                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1494                         return (m);     /* NB: no decap. */
1495                 bcopy(data + off, &marker, sizeof(uint64_t));
1496                 if (marker != 0)        /* Non-IKE marker. */
1497                         return (m);     /* NB: no decap. */
1498                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1499         } else {
1500                 uint32_t spi;
1501
1502                 if (payload <= sizeof(struct esp)) {
1503                         IPSECSTAT_INC(ips_in_inval);
1504                         m_freem(m);
1505                         return (NULL);  /* Discard. */
1506                 }
1507                 bcopy(data + off, &spi, sizeof(uint32_t));
1508                 if (spi == 0)           /* Non-ESP marker. */
1509                         return (m);     /* NB: no decap. */
1510                 skip = sizeof(struct udphdr);
1511         }
1512
1513         /*
1514          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1515          * the UDP ports. This is required if we want to select
1516          * the right SPD for multiple hosts behind same NAT.
1517          *
1518          * NB: ports are maintained in network byte order everywhere
1519          *     in the NAT-T code.
1520          */
1521         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1522                 2 * sizeof(uint16_t), M_NOWAIT);
1523         if (tag == NULL) {
1524                 IPSECSTAT_INC(ips_in_nomem);
1525                 m_freem(m);
1526                 return (NULL);          /* Discard. */
1527         }
1528         iphlen = off - sizeof(struct udphdr);
1529         udphdr = (struct udphdr *)(data + iphlen);
1530         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1531         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1532         m_tag_prepend(m, tag);
1533
1534         /*
1535          * Remove the UDP header (and possibly the non ESP marker)
1536          * IP header length is iphlen
1537          * Before:
1538          *   <--- off --->
1539          *   +----+------+-----+
1540          *   | IP |  UDP | ESP |
1541          *   +----+------+-----+
1542          *        <-skip->
1543          * After:
1544          *          +----+-----+
1545          *          | IP | ESP |
1546          *          +----+-----+
1547          *   <-skip->
1548          */
1549         ovbcopy(data, data + skip, iphlen);
1550         m_adj(m, skip);
1551
1552         ip = mtod(m, struct ip *);
1553         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1554         ip->ip_p = IPPROTO_ESP;
1555
1556         /*
1557          * We cannot yet update the cksums so clear any
1558          * h/w cksum flags as they are no longer valid.
1559          */
1560         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1561                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1562
1563         (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1564         return (NULL);                  /* NB: consumed, bypass processing. */
1565 }
1566 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1567
1568 static void
1569 udp_abort(struct socket *so)
1570 {
1571         struct inpcb *inp;
1572         struct inpcbinfo *pcbinfo;
1573
1574         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1575         inp = sotoinpcb(so);
1576         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1577         INP_WLOCK(inp);
1578         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1579                 INP_HASH_WLOCK(pcbinfo);
1580                 in_pcbdisconnect(inp);
1581                 inp->inp_laddr.s_addr = INADDR_ANY;
1582                 INP_HASH_WUNLOCK(pcbinfo);
1583                 soisdisconnected(so);
1584         }
1585         INP_WUNLOCK(inp);
1586 }
1587
1588 static int
1589 udp_attach(struct socket *so, int proto, struct thread *td)
1590 {
1591         struct inpcb *inp;
1592         struct inpcbinfo *pcbinfo;
1593         int error;
1594
1595         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1596         inp = sotoinpcb(so);
1597         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1598         error = soreserve(so, udp_sendspace, udp_recvspace);
1599         if (error)
1600                 return (error);
1601         INP_INFO_WLOCK(pcbinfo);
1602         error = in_pcballoc(so, pcbinfo);
1603         if (error) {
1604                 INP_INFO_WUNLOCK(pcbinfo);
1605                 return (error);
1606         }
1607
1608         inp = sotoinpcb(so);
1609         inp->inp_vflag |= INP_IPV4;
1610         inp->inp_ip_ttl = V_ip_defttl;
1611
1612         error = udp_newudpcb(inp);
1613         if (error) {
1614                 in_pcbdetach(inp);
1615                 in_pcbfree(inp);
1616                 INP_INFO_WUNLOCK(pcbinfo);
1617                 return (error);
1618         }
1619
1620         INP_WUNLOCK(inp);
1621         INP_INFO_WUNLOCK(pcbinfo);
1622         return (0);
1623 }
1624 #endif /* INET */
1625
1626 int
1627 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
1628 {
1629         struct inpcb *inp;
1630         struct udpcb *up;
1631
1632         KASSERT(so->so_type == SOCK_DGRAM,
1633             ("udp_set_kernel_tunneling: !dgram"));
1634         inp = sotoinpcb(so);
1635         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1636         INP_WLOCK(inp);
1637         up = intoudpcb(inp);
1638         if (up->u_tun_func != NULL) {
1639                 INP_WUNLOCK(inp);
1640                 return (EBUSY);
1641         }
1642         up->u_tun_func = f;
1643         INP_WUNLOCK(inp);
1644         return (0);
1645 }
1646
1647 #ifdef INET
1648 static int
1649 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1650 {
1651         struct inpcb *inp;
1652         struct inpcbinfo *pcbinfo;
1653         int error;
1654
1655         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1656         inp = sotoinpcb(so);
1657         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1658         INP_WLOCK(inp);
1659         INP_HASH_WLOCK(pcbinfo);
1660         error = in_pcbbind(inp, nam, td->td_ucred);
1661         INP_HASH_WUNLOCK(pcbinfo);
1662         INP_WUNLOCK(inp);
1663         return (error);
1664 }
1665
1666 static void
1667 udp_close(struct socket *so)
1668 {
1669         struct inpcb *inp;
1670         struct inpcbinfo *pcbinfo;
1671
1672         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1673         inp = sotoinpcb(so);
1674         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1675         INP_WLOCK(inp);
1676         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1677                 INP_HASH_WLOCK(pcbinfo);
1678                 in_pcbdisconnect(inp);
1679                 inp->inp_laddr.s_addr = INADDR_ANY;
1680                 INP_HASH_WUNLOCK(pcbinfo);
1681                 soisdisconnected(so);
1682         }
1683         INP_WUNLOCK(inp);
1684 }
1685
1686 static int
1687 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1688 {
1689         struct inpcb *inp;
1690         struct inpcbinfo *pcbinfo;
1691         struct sockaddr_in *sin;
1692         int error;
1693
1694         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1695         inp = sotoinpcb(so);
1696         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1697         INP_WLOCK(inp);
1698         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1699                 INP_WUNLOCK(inp);
1700                 return (EISCONN);
1701         }
1702         sin = (struct sockaddr_in *)nam;
1703         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1704         if (error != 0) {
1705                 INP_WUNLOCK(inp);
1706                 return (error);
1707         }
1708         INP_HASH_WLOCK(pcbinfo);
1709         error = in_pcbconnect(inp, nam, td->td_ucred);
1710         INP_HASH_WUNLOCK(pcbinfo);
1711         if (error == 0)
1712                 soisconnected(so);
1713         INP_WUNLOCK(inp);
1714         return (error);
1715 }
1716
1717 static void
1718 udp_detach(struct socket *so)
1719 {
1720         struct inpcb *inp;
1721         struct inpcbinfo *pcbinfo;
1722         struct udpcb *up;
1723
1724         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1725         inp = sotoinpcb(so);
1726         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1727         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1728             ("udp_detach: not disconnected"));
1729         INP_INFO_WLOCK(pcbinfo);
1730         INP_WLOCK(inp);
1731         up = intoudpcb(inp);
1732         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1733         inp->inp_ppcb = NULL;
1734         in_pcbdetach(inp);
1735         in_pcbfree(inp);
1736         INP_INFO_WUNLOCK(pcbinfo);
1737         udp_discardcb(up);
1738 }
1739
1740 static int
1741 udp_disconnect(struct socket *so)
1742 {
1743         struct inpcb *inp;
1744         struct inpcbinfo *pcbinfo;
1745
1746         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1747         inp = sotoinpcb(so);
1748         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1749         INP_WLOCK(inp);
1750         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1751                 INP_WUNLOCK(inp);
1752                 return (ENOTCONN);
1753         }
1754         INP_HASH_WLOCK(pcbinfo);
1755         in_pcbdisconnect(inp);
1756         inp->inp_laddr.s_addr = INADDR_ANY;
1757         INP_HASH_WUNLOCK(pcbinfo);
1758         SOCK_LOCK(so);
1759         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1760         SOCK_UNLOCK(so);
1761         INP_WUNLOCK(inp);
1762         return (0);
1763 }
1764
1765 static int
1766 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1767     struct mbuf *control, struct thread *td)
1768 {
1769         struct inpcb *inp;
1770
1771         inp = sotoinpcb(so);
1772         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1773         return (udp_output(inp, m, addr, control, td));
1774 }
1775 #endif /* INET */
1776
1777 int
1778 udp_shutdown(struct socket *so)
1779 {
1780         struct inpcb *inp;
1781
1782         inp = sotoinpcb(so);
1783         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1784         INP_WLOCK(inp);
1785         socantsendmore(so);
1786         INP_WUNLOCK(inp);
1787         return (0);
1788 }
1789
1790 #ifdef INET
1791 struct pr_usrreqs udp_usrreqs = {
1792         .pru_abort =            udp_abort,
1793         .pru_attach =           udp_attach,
1794         .pru_bind =             udp_bind,
1795         .pru_connect =          udp_connect,
1796         .pru_control =          in_control,
1797         .pru_detach =           udp_detach,
1798         .pru_disconnect =       udp_disconnect,
1799         .pru_peeraddr =         in_getpeeraddr,
1800         .pru_send =             udp_send,
1801         .pru_soreceive =        soreceive_dgram,
1802         .pru_sosend =           sosend_dgram,
1803         .pru_shutdown =         udp_shutdown,
1804         .pru_sockaddr =         in_getsockaddr,
1805         .pru_sosetlabel =       in_pcbsosetlabel,
1806         .pru_close =            udp_close,
1807 };
1808 #endif /* INET */