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