sys/netinet/udp_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   5  *      The Regents of the University of California.
   6  * Copyright (c) 2008 Robert N. M. Watson
   7  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   8  * Copyright (c) 2014 Kevin Lo
   9  * All rights reserved.
  10  *
  11  * Portions of this software were developed by Robert N. M. Watson under
  12  * contract to Juniper Networks, Inc.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  39  */
  40
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include "opt_inet.h"
  45 #include "opt_inet6.h"
  46 #include "opt_ipsec.h"
  47 #include "opt_route.h"
  48 #include "opt_rss.h"
  49
  50 #include <sys/param.h>
  51 #include <sys/domain.h>
  52 #include <sys/eventhandler.h>
  53 #include <sys/jail.h>
  54 #include <sys/kernel.h>
  55 #include <sys/lock.h>
  56 #include <sys/malloc.h>
  57 #include <sys/mbuf.h>
  58 #include <sys/priv.h>
  59 #include <sys/proc.h>
  60 #include <sys/protosw.h>
  61 #include <sys/sdt.h>
  62 #include <sys/signalvar.h>
  63 #include <sys/socket.h>
  64 #include <sys/socketvar.h>
  65 #include <sys/sx.h>
  66 #include <sys/sysctl.h>
  67 #include <sys/syslog.h>
  68 #include <sys/systm.h>
  69
  70 #include <vm/uma.h>
  71
  72 #include <net/if.h>
  73 #include <net/if_var.h>
  74 #include <net/route.h>
  75 #include <net/route/nhop.h>
  76 #include <net/rss_config.h>
  77
  78 #include <netinet/in.h>
  79 #include <netinet/in_kdtrace.h>
  80 #include <netinet/in_fib.h>
  81 #include <netinet/in_pcb.h>
  82 #include <netinet/in_systm.h>
  83 #include <netinet/in_var.h>
  84 #include <netinet/ip.h>
  85 #ifdef INET6
  86 #include <netinet/ip6.h>
  87 #endif
  88 #include <netinet/ip_icmp.h>
  89 #include <netinet/icmp_var.h>
  90 #include <netinet/ip_var.h>
  91 #include <netinet/ip_options.h>
  92 #ifdef INET6
  93 #include <netinet6/ip6_var.h>
  94 #endif
  95 #include <netinet/udp.h>
  96 #include <netinet/udp_var.h>
  97 #include <netinet/udplite.h>
  98 #include <netinet/in_rss.h>
  99
 100 #include <netipsec/ipsec_support.h>
 101
 102 #include <machine/in_cksum.h>
 103
 104 #include <security/mac/mac_framework.h>
 105
 106 /*
 107  * UDP and UDP-Lite protocols implementation.
 108  * Per RFC 768, August, 1980.
 109  * Per RFC 3828, July, 2004.
 110  */
 111
 112 /*
 113  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 114  * removes the only data integrity mechanism for packets and malformed
 115  * packets that would otherwise be discarded due to bad checksums, and may
 116  * cause problems (especially for NFS data blocks).
 117  */
 118 VNET_DEFINE(int, udp_cksum) = 1;
 119 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 120     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 121
 122 VNET_DEFINE(int, udp_log_in_vain) = 0;
 123 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_VNET | CTLFLAG_RW,
 124     &VNET_NAME(udp_log_in_vain), 0, "Log all incoming UDP packets");
 125
 126 VNET_DEFINE(int, udp_blackhole) = 0;
 127 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 128     &VNET_NAME(udp_blackhole), 0,
 129     "Do not send port unreachables for refused connects");
 130
 131 u_long  udp_sendspace = 9216;           /* really max datagram size */
 132 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 133     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 134
 135 u_long  udp_recvspace = 40 * (1024 +
 136 #ifdef INET6
 137                                       sizeof(struct sockaddr_in6)
 138 #else
 139                                       sizeof(struct sockaddr_in)
 140 #endif
 141                                       );        /* 40 1K datagrams */
 142
 143 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 144     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 145
 146 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 147 VNET_DEFINE(struct inpcbinfo, udbinfo);
 148 VNET_DEFINE(struct inpcbhead, ulitecb);
 149 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 150 VNET_DEFINE_STATIC(uma_zone_t, udpcb_zone);
 151 #define V_udpcb_zone                    VNET(udpcb_zone)
 152
 153 #ifndef UDBHASHSIZE
 154 #define UDBHASHSIZE     128
 155 #endif
 156
 157 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 158 VNET_PCPUSTAT_SYSINIT(udpstat);
 159 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 160     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 161
 162 #ifdef VIMAGE
 163 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 164 #endif /* VIMAGE */
 165 #ifdef INET
 166 static void     udp_detach(struct socket *so);
 167 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 168                     struct mbuf *, struct thread *, int);
 169 #endif
 170
 171 static void
 172 udp_zone_change(void *tag)
 173 {
 174
 175         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 176         uma_zone_set_max(V_udpcb_zone, maxsockets);
 177 }
 178
 179 static int
 180 udp_inpcb_init(void *mem, int size, int flags)
 181 {
 182         struct inpcb *inp;
 183
 184         inp = mem;
 185         INP_LOCK_INIT(inp, "inp", "udpinp");
 186         return (0);
 187 }
 188
 189 static int
 190 udplite_inpcb_init(void *mem, int size, int flags)
 191 {
 192         struct inpcb *inp;
 193
 194         inp = mem;
 195         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 196         return (0);
 197 }
 198
 199 void
 200 udp_init(void)
 201 {
 202
 203         /*
 204          * For now default to 2-tuple UDP hashing - until the fragment
 205          * reassembly code can also update the flowid.
 206          *
 207          * Once we can calculate the flowid that way and re-establish
 208          * a 4-tuple, flip this to 4-tuple.
 209          */
 210         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 211             "udp_inpcb", udp_inpcb_init, IPI_HASHFIELDS_2TUPLE);
 212         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 213             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 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,
 226             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 static void
 264 udp_destroy(void *unused __unused)
 265 {
 266
 267         in_pcbinfo_destroy(&V_udbinfo);
 268         uma_zdestroy(V_udpcb_zone);
 269 }
 270 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 271
 272 static void
 273 udplite_destroy(void *unused __unused)
 274 {
 275
 276         in_pcbinfo_destroy(&V_ulitecbinfo);
 277 }
 278 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 279     NULL);
 280 #endif
 281
 282 #ifdef INET
 283 /*
 284  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 285  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 286  * contains the source address.  If the socket ends up being an IPv6 socket,
 287  * udp_append() will convert to a sockaddr_in6 before passing the address
 288  * into the socket code.
 289  *
 290  * In the normal case udp_append() will return 0, indicating that you
 291  * must unlock the inp. However if a tunneling protocol is in place we increment
 292  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 293  * then decrement the reference count. If the inp_rele returns 1, indicating the
 294  * inp is gone, we return that to the caller to tell them *not* to unlock
 295  * the inp. In the case of multi-cast this will cause the distribution
 296  * to stop (though most tunneling protocols known currently do *not* use
 297  * multicast).
 298  */
 299 static int
 300 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 301     struct sockaddr_in *udp_in)
 302 {
 303         struct sockaddr *append_sa;
 304         struct socket *so;
 305         struct mbuf *tmpopts, *opts = NULL;
 306 #ifdef INET6
 307         struct sockaddr_in6 udp_in6;
 308 #endif
 309         struct udpcb *up;
 310
 311         INP_LOCK_ASSERT(inp);
 312
 313         /*
 314          * Engage the tunneling protocol.
 315          */
 316         up = intoudpcb(inp);
 317         if (up->u_tun_func != NULL) {
 318                 in_pcbref(inp);
 319                 INP_RUNLOCK(inp);
 320                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&udp_in[0],
 321                     up->u_tun_ctx);
 322                 INP_RLOCK(inp);
 323                 return (in_pcbrele_rlocked(inp));
 324         }
 325
 326         off += sizeof(struct udphdr);
 327
 328 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 329         /* Check AH/ESP integrity. */
 330         if (IPSEC_ENABLED(ipv4) &&
 331             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 332                 m_freem(n);
 333                 return (0);
 334         }
 335         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 336                 if (IPSEC_ENABLED(ipv4) &&
 337                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 338                         return (0);     /* Consumed. */
 339         }
 340 #endif /* IPSEC */
 341 #ifdef MAC
 342         if (mac_inpcb_check_deliver(inp, n) != 0) {
 343                 m_freem(n);
 344                 return (0);
 345         }
 346 #endif /* MAC */
 347         if (inp->inp_flags & INP_CONTROLOPTS ||
 348             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 349 #ifdef INET6
 350                 if (inp->inp_vflag & INP_IPV6)
 351                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 352                 else
 353 #endif /* INET6 */
 354                         ip_savecontrol(inp, &opts, ip, n);
 355         }
 356         if ((inp->inp_vflag & INP_IPV4) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 357                 tmpopts = sbcreatecontrol((caddr_t)&udp_in[1],
 358                         sizeof(struct sockaddr_in), IP_ORIGDSTADDR, IPPROTO_IP);
 359                 if (tmpopts) {
 360                         if (opts) {
 361                                 tmpopts->m_next = opts;
 362                                 opts = tmpopts;
 363                         } else
 364                                 opts = tmpopts;
 365                 }
 366         }
 367 #ifdef INET6
 368         if (inp->inp_vflag & INP_IPV6) {
 369                 bzero(&udp_in6, sizeof(udp_in6));
 370                 udp_in6.sin6_len = sizeof(udp_in6);
 371                 udp_in6.sin6_family = AF_INET6;
 372                 in6_sin_2_v4mapsin6(&udp_in[0], &udp_in6);
 373                 append_sa = (struct sockaddr *)&udp_in6;
 374         } else
 375 #endif /* INET6 */
 376                 append_sa = (struct sockaddr *)&udp_in[0];
 377         m_adj(n, off);
 378
 379         so = inp->inp_socket;
 380         SOCKBUF_LOCK(&so->so_rcv);
 381         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 382                 SOCKBUF_UNLOCK(&so->so_rcv);
 383                 m_freem(n);
 384                 if (opts)
 385                         m_freem(opts);
 386                 UDPSTAT_INC(udps_fullsock);
 387         } else
 388                 sorwakeup_locked(so);
 389         return (0);
 390 }
 391
 392 int
 393 udp_input(struct mbuf **mp, int *offp, int proto)
 394 {
 395         struct ip *ip;
 396         struct udphdr *uh;
 397         struct ifnet *ifp;
 398         struct inpcb *inp;
 399         uint16_t len, ip_len;
 400         struct inpcbinfo *pcbinfo;
 401         struct ip save_ip;
 402         struct sockaddr_in udp_in[2];
 403         struct mbuf *m;
 404         struct m_tag *fwd_tag;
 405         int cscov_partial, iphlen;
 406
 407         m = *mp;
 408         iphlen = *offp;
 409         ifp = m->m_pkthdr.rcvif;
 410         *mp = NULL;
 411         UDPSTAT_INC(udps_ipackets);
 412
 413         /*
 414          * Strip IP options, if any; should skip this, make available to
 415          * user, and use on returned packets, but we don't yet have a way to
 416          * check the checksum with options still present.
 417          */
 418         if (iphlen > sizeof (struct ip)) {
 419                 ip_stripoptions(m);
 420                 iphlen = sizeof(struct ip);
 421         }
 422
 423         /*
 424          * Get IP and UDP header together in first mbuf.
 425          */
 426         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 427                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 428                         UDPSTAT_INC(udps_hdrops);
 429                         return (IPPROTO_DONE);
 430                 }
 431         }
 432         ip = mtod(m, struct ip *);
 433         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 434         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 435
 436         /*
 437          * Destination port of 0 is illegal, based on RFC768.
 438          */
 439         if (uh->uh_dport == 0)
 440                 goto badunlocked;
 441
 442         /*
 443          * Construct sockaddr format source address.  Stuff source address
 444          * and datagram in user buffer.
 445          */
 446         bzero(&udp_in[0], sizeof(struct sockaddr_in) * 2);
 447         udp_in[0].sin_len = sizeof(struct sockaddr_in);
 448         udp_in[0].sin_family = AF_INET;
 449         udp_in[0].sin_port = uh->uh_sport;
 450         udp_in[0].sin_addr = ip->ip_src;
 451         udp_in[1].sin_len = sizeof(struct sockaddr_in);
 452         udp_in[1].sin_family = AF_INET;
 453         udp_in[1].sin_port = uh->uh_dport;
 454         udp_in[1].sin_addr = ip->ip_dst;
 455
 456         /*
 457          * Make mbuf data length reflect UDP length.  If not enough data to
 458          * reflect UDP length, drop.
 459          */
 460         len = ntohs((u_short)uh->uh_ulen);
 461         ip_len = ntohs(ip->ip_len) - iphlen;
 462         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 463                 /* Zero means checksum over the complete packet. */
 464                 if (len == 0)
 465                         len = ip_len;
 466                 cscov_partial = 0;
 467         }
 468         if (ip_len != len) {
 469                 if (len > ip_len || len < sizeof(struct udphdr)) {
 470                         UDPSTAT_INC(udps_badlen);
 471                         goto badunlocked;
 472                 }
 473                 if (proto == IPPROTO_UDP)
 474                         m_adj(m, len - ip_len);
 475         }
 476
 477         /*
 478          * Save a copy of the IP header in case we want restore it for
 479          * sending an ICMP error message in response.
 480          */
 481         if (!V_udp_blackhole)
 482                 save_ip = *ip;
 483         else
 484                 memset(&save_ip, 0, sizeof(save_ip));
 485
 486         /*
 487          * Checksum extended UDP header and data.
 488          */
 489         if (uh->uh_sum) {
 490                 u_short uh_sum;
 491
 492                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 493                     !cscov_partial) {
 494                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 495                                 uh_sum = m->m_pkthdr.csum_data;
 496                         else
 497                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 498                                     ip->ip_dst.s_addr, htonl((u_short)len +
 499                                     m->m_pkthdr.csum_data + proto));
 500                         uh_sum ^= 0xffff;
 501                 } else {
 502                         char b[9];
 503
 504                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 505                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 506                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 507                             uh->uh_ulen : htons(ip_len);
 508                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 509                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 510                 }
 511                 if (uh_sum) {
 512                         UDPSTAT_INC(udps_badsum);
 513                         m_freem(m);
 514                         return (IPPROTO_DONE);
 515                 }
 516         } else {
 517                 if (proto == IPPROTO_UDP) {
 518                         UDPSTAT_INC(udps_nosum);
 519                 } else {
 520                         /* UDPLite requires a checksum */
 521                         /* XXX: What is the right UDPLite MIB counter here? */
 522                         m_freem(m);
 523                         return (IPPROTO_DONE);
 524                 }
 525         }
 526
 527         pcbinfo = udp_get_inpcbinfo(proto);
 528         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 529             in_broadcast(ip->ip_dst, ifp)) {
 530                 struct inpcb *last;
 531                 struct inpcbhead *pcblist;
 532
 533                 NET_EPOCH_ASSERT();
 534
 535                 pcblist = udp_get_pcblist(proto);
 536                 last = NULL;
 537                 CK_LIST_FOREACH(inp, pcblist, inp_list) {
 538                         if (inp->inp_lport != uh->uh_dport)
 539                                 continue;
 540 #ifdef INET6
 541                         if ((inp->inp_vflag & INP_IPV4) == 0)
 542                                 continue;
 543 #endif
 544                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 545                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 546                                 continue;
 547                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 548                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 549                                 continue;
 550                         if (inp->inp_fport != 0 &&
 551                             inp->inp_fport != uh->uh_sport)
 552                                 continue;
 553
 554                         INP_RLOCK(inp);
 555
 556                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 557                                 INP_RUNLOCK(inp);
 558                                 continue;
 559                         }
 560
 561                         /*
 562                          * XXXRW: Because we weren't holding either the inpcb
 563                          * or the hash lock when we checked for a match
 564                          * before, we should probably recheck now that the
 565                          * inpcb lock is held.
 566                          */
 567
 568                         /*
 569                          * Handle socket delivery policy for any-source
 570                          * and source-specific multicast. [RFC3678]
 571                          */
 572                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 573                                 struct ip_moptions      *imo;
 574                                 struct sockaddr_in       group;
 575                                 int                      blocked;
 576
 577                                 imo = inp->inp_moptions;
 578                                 if (imo == NULL) {
 579                                         INP_RUNLOCK(inp);
 580                                         continue;
 581                                 }
 582                                 bzero(&group, sizeof(struct sockaddr_in));
 583                                 group.sin_len = sizeof(struct sockaddr_in);
 584                                 group.sin_family = AF_INET;
 585                                 group.sin_addr = ip->ip_dst;
 586
 587                                 blocked = imo_multi_filter(imo, ifp,
 588                                         (struct sockaddr *)&group,
 589                                         (struct sockaddr *)&udp_in[0]);
 590                                 if (blocked != MCAST_PASS) {
 591                                         if (blocked == MCAST_NOTGMEMBER)
 592                                                 IPSTAT_INC(ips_notmember);
 593                                         if (blocked == MCAST_NOTSMEMBER ||
 594                                             blocked == MCAST_MUTED)
 595                                                 UDPSTAT_INC(udps_filtermcast);
 596                                         INP_RUNLOCK(inp);
 597                                         continue;
 598                                 }
 599                         }
 600                         if (last != NULL) {
 601                                 struct mbuf *n;
 602
 603                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 604                                     NULL) {
 605                                         if (proto == IPPROTO_UDPLITE)
 606                                                 UDPLITE_PROBE(receive, NULL, last, ip,
 607                                                     last, uh);
 608                                         else
 609                                                 UDP_PROBE(receive, NULL, last, ip, last,
 610                                                     uh);
 611                                         if (udp_append(last, ip, n, iphlen,
 612                                                 udp_in)) {
 613                                                 INP_RUNLOCK(inp);
 614                                                 goto badunlocked;
 615                                         }
 616                                 }
 617                                 /* Release PCB lock taken on previous pass. */
 618                                 INP_RUNLOCK(last);
 619                         }
 620                         last = inp;
 621                         /*
 622                          * Don't look for additional matches if this one does
 623                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 624                          * socket options set.  This heuristic avoids
 625                          * searching through all pcbs in the common case of a
 626                          * non-shared port.  It assumes that an application
 627                          * will never clear these options after setting them.
 628                          */
 629                         if ((last->inp_socket->so_options &
 630                             (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
 631                                 break;
 632                 }
 633
 634                 if (last == NULL) {
 635                         /*
 636                          * No matching pcb found; discard datagram.  (No need
 637                          * to send an ICMP Port Unreachable for a broadcast
 638                          * or multicast datgram.)
 639                          */
 640                         UDPSTAT_INC(udps_noport);
 641                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)))
 642                                 UDPSTAT_INC(udps_noportmcast);
 643                         else
 644                                 UDPSTAT_INC(udps_noportbcast);
 645                         goto badunlocked;
 646                 }
 647                 if (proto == IPPROTO_UDPLITE)
 648                         UDPLITE_PROBE(receive, NULL, last, ip, last, uh);
 649                 else
 650                         UDP_PROBE(receive, NULL, last, ip, last, uh);
 651                 if (udp_append(last, ip, m, iphlen, udp_in) == 0)
 652                         INP_RUNLOCK(last);
 653                 return (IPPROTO_DONE);
 654         }
 655
 656         /*
 657          * Locate pcb for datagram.
 658          */
 659
 660         /*
 661          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 662          */
 663         if ((m->m_flags & M_IP_NEXTHOP) &&
 664             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 665                 struct sockaddr_in *next_hop;
 666
 667                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 668
 669                 /*
 670                  * Transparently forwarded. Pretend to be the destination.
 671                  * Already got one like this?
 672                  */
 673                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 674                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 675                 if (!inp) {
 676                         /*
 677                          * It's new.  Try to find the ambushing socket.
 678                          * Because we've rewritten the destination address,
 679                          * any hardware-generated hash is ignored.
 680                          */
 681                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 682                             uh->uh_sport, next_hop->sin_addr,
 683                             next_hop->sin_port ? htons(next_hop->sin_port) :
 684                             uh->uh_dport, INPLOOKUP_WILDCARD |
 685                             INPLOOKUP_RLOCKPCB, ifp);
 686                 }
 687                 /* Remove the tag from the packet. We don't need it anymore. */
 688                 m_tag_delete(m, fwd_tag);
 689                 m->m_flags &= ~M_IP_NEXTHOP;
 690         } else
 691                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 692                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 693                     INPLOOKUP_RLOCKPCB, ifp, m);
 694         if (inp == NULL) {
 695                 if (V_udp_log_in_vain) {
 696                         char src[INET_ADDRSTRLEN];
 697                         char dst[INET_ADDRSTRLEN];
 698
 699                         log(LOG_INFO,
 700                             "Connection attempt to UDP %s:%d from %s:%d\n",
 701                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 702                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 703                 }
 704                 if (proto == IPPROTO_UDPLITE)
 705                         UDPLITE_PROBE(receive, NULL, NULL, ip, NULL, uh);
 706                 else
 707                         UDP_PROBE(receive, NULL, NULL, ip, NULL, uh);
 708                 UDPSTAT_INC(udps_noport);
 709                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 710                         UDPSTAT_INC(udps_noportbcast);
 711                         goto badunlocked;
 712                 }
 713                 if (V_udp_blackhole)
 714                         goto badunlocked;
 715                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 716                         goto badunlocked;
 717                 *ip = save_ip;
 718                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 719                 return (IPPROTO_DONE);
 720         }
 721
 722         /*
 723          * Check the minimum TTL for socket.
 724          */
 725         INP_RLOCK_ASSERT(inp);
 726         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 727                 if (proto == IPPROTO_UDPLITE)
 728                         UDPLITE_PROBE(receive, NULL, inp, ip, inp, uh);
 729                 else
 730                         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 731                 INP_RUNLOCK(inp);
 732                 m_freem(m);
 733                 return (IPPROTO_DONE);
 734         }
 735         if (cscov_partial) {
 736                 struct udpcb *up;
 737
 738                 up = intoudpcb(inp);
 739                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 740                         INP_RUNLOCK(inp);
 741                         m_freem(m);
 742                         return (IPPROTO_DONE);
 743                 }
 744         }
 745
 746         if (proto == IPPROTO_UDPLITE)
 747                 UDPLITE_PROBE(receive, NULL, inp, ip, inp, uh);
 748         else
 749                 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 750         if (udp_append(inp, ip, m, iphlen, udp_in) == 0)
 751                 INP_RUNLOCK(inp);
 752         return (IPPROTO_DONE);
 753
 754 badunlocked:
 755         m_freem(m);
 756         return (IPPROTO_DONE);
 757 }
 758 #endif /* INET */
 759
 760 /*
 761  * Notify a udp user of an asynchronous error; just wake up so that they can
 762  * collect error status.
 763  */
 764 struct inpcb *
 765 udp_notify(struct inpcb *inp, int errno)
 766 {
 767
 768         INP_WLOCK_ASSERT(inp);
 769         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 770              errno == EHOSTDOWN) && inp->inp_route.ro_nh) {
 771                 NH_FREE(inp->inp_route.ro_nh);
 772                 inp->inp_route.ro_nh = (struct nhop_object *)NULL;
 773         }
 774
 775         inp->inp_socket->so_error = errno;
 776         sorwakeup(inp->inp_socket);
 777         sowwakeup(inp->inp_socket);
 778         return (inp);
 779 }
 780
 781 #ifdef INET
 782 static void
 783 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 784     struct inpcbinfo *pcbinfo)
 785 {
 786         struct ip *ip = vip;
 787         struct udphdr *uh;
 788         struct in_addr faddr;
 789         struct inpcb *inp;
 790
 791         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 792         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 793                 return;
 794
 795         if (PRC_IS_REDIRECT(cmd)) {
 796                 /* signal EHOSTDOWN, as it flushes the cached route */
 797                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 798                 return;
 799         }
 800
 801         /*
 802          * Hostdead is ugly because it goes linearly through all PCBs.
 803          *
 804          * XXX: We never get this from ICMP, otherwise it makes an excellent
 805          * DoS attack on machines with many connections.
 806          */
 807         if (cmd == PRC_HOSTDEAD)
 808                 ip = NULL;
 809         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 810                 return;
 811         if (ip != NULL) {
 812                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 813                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 814                     ip->ip_src, uh->uh_sport, INPLOOKUP_WLOCKPCB, NULL);
 815                 if (inp != NULL) {
 816                         INP_WLOCK_ASSERT(inp);
 817                         if (inp->inp_socket != NULL) {
 818                                 udp_notify(inp, inetctlerrmap[cmd]);
 819                         }
 820                         INP_WUNLOCK(inp);
 821                 } else {
 822                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 823                                            ip->ip_src, uh->uh_sport,
 824                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 825                         if (inp != NULL) {
 826                                 struct udpcb *up;
 827                                 void *ctx;
 828                                 udp_tun_icmp_t func;
 829
 830                                 up = intoudpcb(inp);
 831                                 ctx = up->u_tun_ctx;
 832                                 func = up->u_icmp_func;
 833                                 INP_RUNLOCK(inp);
 834                                 if (func != NULL)
 835                                         (*func)(cmd, sa, vip, ctx);
 836                         }
 837                 }
 838         } else
 839                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 840                     udp_notify);
 841 }
 842 void
 843 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 844 {
 845
 846         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 847 }
 848
 849 void
 850 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 851 {
 852
 853         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 854 }
 855 #endif /* INET */
 856
 857 static int
 858 udp_pcblist(SYSCTL_HANDLER_ARGS)
 859 {
 860         struct xinpgen xig;
 861         struct epoch_tracker et;
 862         struct inpcb *inp;
 863         int error;
 864
 865         if (req->newptr != 0)
 866                 return (EPERM);
 867
 868         if (req->oldptr == 0) {
 869                 int n;
 870
 871                 n = V_udbinfo.ipi_count;
 872                 n += imax(n / 8, 10);
 873                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 874                 return (0);
 875         }
 876
 877         if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
 878                 return (error);
 879
 880         bzero(&xig, sizeof(xig));
 881         xig.xig_len = sizeof xig;
 882         xig.xig_count = V_udbinfo.ipi_count;
 883         xig.xig_gen = V_udbinfo.ipi_gencnt;
 884         xig.xig_sogen = so_gencnt;
 885         error = SYSCTL_OUT(req, &xig, sizeof xig);
 886         if (error)
 887                 return (error);
 888
 889         NET_EPOCH_ENTER(et);
 890         for (inp = CK_LIST_FIRST(V_udbinfo.ipi_listhead);
 891             inp != NULL;
 892             inp = CK_LIST_NEXT(inp, inp_list)) {
 893                 INP_RLOCK(inp);
 894                 if (inp->inp_gencnt <= xig.xig_gen &&
 895                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 896                         struct xinpcb xi;
 897
 898                         in_pcbtoxinpcb(inp, &xi);
 899                         INP_RUNLOCK(inp);
 900                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 901                         if (error)
 902                                 break;
 903                 } else
 904                         INP_RUNLOCK(inp);
 905         }
 906         NET_EPOCH_EXIT(et);
 907
 908         if (!error) {
 909                 /*
 910                  * Give the user an updated idea of our state.  If the
 911                  * generation differs from what we told her before, she knows
 912                  * that something happened while we were processing this
 913                  * request, and it might be necessary to retry.
 914                  */
 915                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 916                 xig.xig_sogen = so_gencnt;
 917                 xig.xig_count = V_udbinfo.ipi_count;
 918                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 919         }
 920
 921         return (error);
 922 }
 923
 924 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 925     CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 926     udp_pcblist, "S,xinpcb",
 927     "List of active UDP sockets");
 928
 929 #ifdef INET
 930 static int
 931 udp_getcred(SYSCTL_HANDLER_ARGS)
 932 {
 933         struct xucred xuc;
 934         struct sockaddr_in addrs[2];
 935         struct epoch_tracker et;
 936         struct inpcb *inp;
 937         int error;
 938
 939         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 940         if (error)
 941                 return (error);
 942         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 943         if (error)
 944                 return (error);
 945         NET_EPOCH_ENTER(et);
 946         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 947             addrs[0].sin_addr, addrs[0].sin_port,
 948             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 949         NET_EPOCH_EXIT(et);
 950         if (inp != NULL) {
 951                 INP_RLOCK_ASSERT(inp);
 952                 if (inp->inp_socket == NULL)
 953                         error = ENOENT;
 954                 if (error == 0)
 955                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 956                 if (error == 0)
 957                         cru2x(inp->inp_cred, &xuc);
 958                 INP_RUNLOCK(inp);
 959         } else
 960                 error = ENOENT;
 961         if (error == 0)
 962                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 963         return (error);
 964 }
 965
 966 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 967     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
 968     0, 0, udp_getcred, "S,xucred",
 969     "Get the xucred of a UDP connection");
 970 #endif /* INET */
 971
 972 int
 973 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 974 {
 975         struct inpcb *inp;
 976         struct udpcb *up;
 977         int isudplite, error, optval;
 978
 979         error = 0;
 980         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 981         inp = sotoinpcb(so);
 982         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 983         INP_WLOCK(inp);
 984         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 985 #ifdef INET6
 986                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 987                         INP_WUNLOCK(inp);
 988                         error = ip6_ctloutput(so, sopt);
 989                 }
 990 #endif
 991 #if defined(INET) && defined(INET6)
 992                 else
 993 #endif
 994 #ifdef INET
 995                 {
 996                         INP_WUNLOCK(inp);
 997                         error = ip_ctloutput(so, sopt);
 998                 }
 999 #endif
1000                 return (error);
1001         }
1002
1003         switch (sopt->sopt_dir) {
1004         case SOPT_SET:
1005                 switch (sopt->sopt_name) {
1006 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1007 #ifdef INET
1008                 case UDP_ENCAP:
1009                         if (!IPSEC_ENABLED(ipv4)) {
1010                                 INP_WUNLOCK(inp);
1011                                 return (ENOPROTOOPT);
1012                         }
1013                         error = UDPENCAP_PCBCTL(inp, sopt);
1014                         break;
1015 #endif /* INET */
1016 #endif /* IPSEC */
1017                 case UDPLITE_SEND_CSCOV:
1018                 case UDPLITE_RECV_CSCOV:
1019                         if (!isudplite) {
1020                                 INP_WUNLOCK(inp);
1021                                 error = ENOPROTOOPT;
1022                                 break;
1023                         }
1024                         INP_WUNLOCK(inp);
1025                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1026                             sizeof(optval));
1027                         if (error != 0)
1028                                 break;
1029                         inp = sotoinpcb(so);
1030                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1031                         INP_WLOCK(inp);
1032                         up = intoudpcb(inp);
1033                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1034                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1035                                 INP_WUNLOCK(inp);
1036                                 error = EINVAL;
1037                                 break;
1038                         }
1039                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1040                                 up->u_txcslen = optval;
1041                         else
1042                                 up->u_rxcslen = optval;
1043                         INP_WUNLOCK(inp);
1044                         break;
1045                 default:
1046                         INP_WUNLOCK(inp);
1047                         error = ENOPROTOOPT;
1048                         break;
1049                 }
1050                 break;
1051         case SOPT_GET:
1052                 switch (sopt->sopt_name) {
1053 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1054 #ifdef INET
1055                 case UDP_ENCAP:
1056                         if (!IPSEC_ENABLED(ipv4)) {
1057                                 INP_WUNLOCK(inp);
1058                                 return (ENOPROTOOPT);
1059                         }
1060                         error = UDPENCAP_PCBCTL(inp, sopt);
1061                         break;
1062 #endif /* INET */
1063 #endif /* IPSEC */
1064                 case UDPLITE_SEND_CSCOV:
1065                 case UDPLITE_RECV_CSCOV:
1066                         if (!isudplite) {
1067                                 INP_WUNLOCK(inp);
1068                                 error = ENOPROTOOPT;
1069                                 break;
1070                         }
1071                         up = intoudpcb(inp);
1072                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1073                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1074                                 optval = up->u_txcslen;
1075                         else
1076                                 optval = up->u_rxcslen;
1077                         INP_WUNLOCK(inp);
1078                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1079                         break;
1080                 default:
1081                         INP_WUNLOCK(inp);
1082                         error = ENOPROTOOPT;
1083                         break;
1084                 }
1085                 break;
1086         }
1087         return (error);
1088 }
1089
1090 #ifdef INET
1091 #ifdef INET6
1092 /* The logic here is derived from ip6_setpktopt(). See comments there. */
1093 static int
1094 udp_v4mapped_pktinfo(struct cmsghdr *cm, struct sockaddr_in * src,
1095     struct inpcb *inp, int flags)
1096 {
1097         struct ifnet *ifp;
1098         struct in6_pktinfo *pktinfo;
1099         struct in_addr ia;
1100
1101         if ((flags & PRUS_IPV6) == 0)
1102                 return (0);
1103
1104         if (cm->cmsg_level != IPPROTO_IPV6)
1105                 return (0);
1106
1107         if  (cm->cmsg_type != IPV6_2292PKTINFO &&
1108             cm->cmsg_type != IPV6_PKTINFO)
1109                 return (0);
1110
1111         if (cm->cmsg_len !=
1112             CMSG_LEN(sizeof(struct in6_pktinfo)))
1113                 return (EINVAL);
1114
1115         pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm);
1116         if (!IN6_IS_ADDR_V4MAPPED(&pktinfo->ipi6_addr) &&
1117             !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr))
1118                 return (EINVAL);
1119
1120         /* Validate the interface index if specified. */
1121         if (pktinfo->ipi6_ifindex > V_if_index)
1122                 return (ENXIO);
1123
1124         ifp = NULL;
1125         if (pktinfo->ipi6_ifindex) {
1126                 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
1127                 if (ifp == NULL)
1128                         return (ENXIO);
1129         }
1130         if (ifp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
1131                 ia.s_addr = pktinfo->ipi6_addr.s6_addr32[3];
1132                 if (in_ifhasaddr(ifp, ia) == 0)
1133                         return (EADDRNOTAVAIL);
1134         }
1135
1136         bzero(src, sizeof(*src));
1137         src->sin_family = AF_INET;
1138         src->sin_len = sizeof(*src);
1139         src->sin_port = inp->inp_lport;
1140         src->sin_addr.s_addr = pktinfo->ipi6_addr.s6_addr32[3];
1141
1142         return (0);
1143 }
1144 #endif
1145
1146 static int
1147 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1148     struct mbuf *control, struct thread *td, int flags)
1149 {
1150         struct udpiphdr *ui;
1151         int len = m->m_pkthdr.len;
1152         struct in_addr faddr, laddr;
1153         struct cmsghdr *cm;
1154         struct inpcbinfo *pcbinfo;
1155         struct sockaddr_in *sin, src;
1156         struct epoch_tracker et;
1157         int cscov_partial = 0;
1158         int error = 0;
1159         int ipflags = 0;
1160         u_short fport, lport;
1161         u_char tos;
1162         uint8_t pr;
1163         uint16_t cscov = 0;
1164         uint32_t flowid = 0;
1165         uint8_t flowtype = M_HASHTYPE_NONE;
1166
1167         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1168                 if (control)
1169                         m_freem(control);
1170                 m_freem(m);
1171                 return (EMSGSIZE);
1172         }
1173
1174         src.sin_family = 0;
1175         sin = (struct sockaddr_in *)addr;
1176
1177         /*
1178          * udp_output() may need to temporarily bind or connect the current
1179          * inpcb.  As such, we don't know up front whether we will need the
1180          * pcbinfo lock or not.  Do any work to decide what is needed up
1181          * front before acquiring any locks.
1182          *
1183          * We will need network epoch in either case, to safely lookup into
1184          * pcb hash.
1185          */
1186         if (sin == NULL ||
1187             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0))
1188                 INP_WLOCK(inp);
1189         else
1190                 INP_RLOCK(inp);
1191         NET_EPOCH_ENTER(et);
1192         tos = inp->inp_ip_tos;
1193         if (control != NULL) {
1194                 /*
1195                  * XXX: Currently, we assume all the optional information is
1196                  * stored in a single mbuf.
1197                  */
1198                 if (control->m_next) {
1199                         m_freem(control);
1200                         error = EINVAL;
1201                         goto release;
1202                 }
1203                 for (; control->m_len > 0;
1204                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1205                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1206                         cm = mtod(control, struct cmsghdr *);
1207                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1208                             || cm->cmsg_len > control->m_len) {
1209                                 error = EINVAL;
1210                                 break;
1211                         }
1212 #ifdef INET6
1213                         error = udp_v4mapped_pktinfo(cm, &src, inp, flags);
1214                         if (error != 0)
1215                                 break;
1216 #endif
1217                         if (cm->cmsg_level != IPPROTO_IP)
1218                                 continue;
1219
1220                         switch (cm->cmsg_type) {
1221                         case IP_SENDSRCADDR:
1222                                 if (cm->cmsg_len !=
1223                                     CMSG_LEN(sizeof(struct in_addr))) {
1224                                         error = EINVAL;
1225                                         break;
1226                                 }
1227                                 bzero(&src, sizeof(src));
1228                                 src.sin_family = AF_INET;
1229                                 src.sin_len = sizeof(src);
1230                                 src.sin_port = inp->inp_lport;
1231                                 src.sin_addr =
1232                                     *(struct in_addr *)CMSG_DATA(cm);
1233                                 break;
1234
1235                         case IP_TOS:
1236                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1237                                         error = EINVAL;
1238                                         break;
1239                                 }
1240                                 tos = *(u_char *)CMSG_DATA(cm);
1241                                 break;
1242
1243                         case IP_FLOWID:
1244                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1245                                         error = EINVAL;
1246                                         break;
1247                                 }
1248                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1249                                 break;
1250
1251                         case IP_FLOWTYPE:
1252                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1253                                         error = EINVAL;
1254                                         break;
1255                                 }
1256                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1257                                 break;
1258
1259 #ifdef  RSS
1260                         case IP_RSSBUCKETID:
1261                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1262                                         error = EINVAL;
1263                                         break;
1264                                 }
1265                                 /* This is just a placeholder for now */
1266                                 break;
1267 #endif  /* RSS */
1268                         default:
1269                                 error = ENOPROTOOPT;
1270                                 break;
1271                         }
1272                         if (error)
1273                                 break;
1274                 }
1275                 m_freem(control);
1276         }
1277         if (error)
1278                 goto release;
1279
1280         pr = inp->inp_socket->so_proto->pr_protocol;
1281         pcbinfo = udp_get_inpcbinfo(pr);
1282
1283         /*
1284          * If the IP_SENDSRCADDR control message was specified, override the
1285          * source address for this datagram.  Its use is invalidated if the
1286          * address thus specified is incomplete or clobbers other inpcbs.
1287          */
1288         laddr = inp->inp_laddr;
1289         lport = inp->inp_lport;
1290         if (src.sin_family == AF_INET) {
1291                 INP_HASH_LOCK_ASSERT(pcbinfo);
1292                 if ((lport == 0) ||
1293                     (laddr.s_addr == INADDR_ANY &&
1294                      src.sin_addr.s_addr == INADDR_ANY)) {
1295                         error = EINVAL;
1296                         goto release;
1297                 }
1298                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1299                     &laddr.s_addr, &lport, td->td_ucred);
1300                 if (error)
1301                         goto release;
1302         }
1303
1304         /*
1305          * If a UDP socket has been connected, then a local address/port will
1306          * have been selected and bound.
1307          *
1308          * If a UDP socket has not been connected to, then an explicit
1309          * destination address must be used, in which case a local
1310          * address/port may not have been selected and bound.
1311          */
1312         if (sin != NULL) {
1313                 INP_LOCK_ASSERT(inp);
1314                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1315                         error = EISCONN;
1316                         goto release;
1317                 }
1318
1319                 /*
1320                  * Jail may rewrite the destination address, so let it do
1321                  * that before we use it.
1322                  */
1323                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1324                 if (error)
1325                         goto release;
1326
1327                 /*
1328                  * If a local address or port hasn't yet been selected, or if
1329                  * the destination address needs to be rewritten due to using
1330                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1331                  * to do the heavy lifting.  Once a port is selected, we
1332                  * commit the binding back to the socket; we also commit the
1333                  * binding of the address if in jail.
1334                  *
1335                  * If we already have a valid binding and we're not
1336                  * requesting a destination address rewrite, use a fast path.
1337                  */
1338                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1339                     inp->inp_lport == 0 ||
1340                     sin->sin_addr.s_addr == INADDR_ANY ||
1341                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1342                         INP_HASH_LOCK_ASSERT(pcbinfo);
1343                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1344                             &lport, &faddr.s_addr, &fport, NULL,
1345                             td->td_ucred);
1346                         if (error)
1347                                 goto release;
1348
1349                         /*
1350                          * XXXRW: Why not commit the port if the address is
1351                          * !INADDR_ANY?
1352                          */
1353                         /* Commit the local port if newly assigned. */
1354                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1355                             inp->inp_lport == 0) {
1356                                 INP_WLOCK_ASSERT(inp);
1357                                 /*
1358                                  * Remember addr if jailed, to prevent
1359                                  * rebinding.
1360                                  */
1361                                 if (prison_flag(td->td_ucred, PR_IP4))
1362                                         inp->inp_laddr = laddr;
1363                                 inp->inp_lport = lport;
1364                                 INP_HASH_WLOCK(pcbinfo);
1365                                 error = in_pcbinshash(inp);
1366                                 INP_HASH_WUNLOCK(pcbinfo);
1367                                 if (error != 0) {
1368                                         inp->inp_lport = 0;
1369                                         error = EAGAIN;
1370                                         goto release;
1371                                 }
1372                                 inp->inp_flags |= INP_ANONPORT;
1373                         }
1374                 } else {
1375                         faddr = sin->sin_addr;
1376                         fport = sin->sin_port;
1377                 }
1378         } else {
1379                 INP_LOCK_ASSERT(inp);
1380                 faddr = inp->inp_faddr;
1381                 fport = inp->inp_fport;
1382                 if (faddr.s_addr == INADDR_ANY) {
1383                         error = ENOTCONN;
1384                         goto release;
1385                 }
1386         }
1387
1388         /*
1389          * Calculate data length and get a mbuf for UDP, IP, and possible
1390          * link-layer headers.  Immediate slide the data pointer back forward
1391          * since we won't use that space at this layer.
1392          */
1393         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1394         if (m == NULL) {
1395                 error = ENOBUFS;
1396                 goto release;
1397         }
1398         m->m_data += max_linkhdr;
1399         m->m_len -= max_linkhdr;
1400         m->m_pkthdr.len -= max_linkhdr;
1401
1402         /*
1403          * Fill in mbuf with extended UDP header and addresses and length put
1404          * into network format.
1405          */
1406         ui = mtod(m, struct udpiphdr *);
1407         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1408         ui->ui_v = IPVERSION << 4;
1409         ui->ui_pr = pr;
1410         ui->ui_src = laddr;
1411         ui->ui_dst = faddr;
1412         ui->ui_sport = lport;
1413         ui->ui_dport = fport;
1414         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1415         if (pr == IPPROTO_UDPLITE) {
1416                 struct udpcb *up;
1417                 uint16_t plen;
1418
1419                 up = intoudpcb(inp);
1420                 cscov = up->u_txcslen;
1421                 plen = (u_short)len + sizeof(struct udphdr);
1422                 if (cscov >= plen)
1423                         cscov = 0;
1424                 ui->ui_len = htons(plen);
1425                 ui->ui_ulen = htons(cscov);
1426                 /*
1427                  * For UDP-Lite, checksum coverage length of zero means
1428                  * the entire UDPLite packet is covered by the checksum.
1429                  */
1430                 cscov_partial = (cscov == 0) ? 0 : 1;
1431         }
1432
1433         /*
1434          * Set the Don't Fragment bit in the IP header.
1435          */
1436         if (inp->inp_flags & INP_DONTFRAG) {
1437                 struct ip *ip;
1438
1439                 ip = (struct ip *)&ui->ui_i;
1440                 ip->ip_off |= htons(IP_DF);
1441         }
1442
1443         if (inp->inp_socket->so_options & SO_DONTROUTE)
1444                 ipflags |= IP_ROUTETOIF;
1445         if (inp->inp_socket->so_options & SO_BROADCAST)
1446                 ipflags |= IP_ALLOWBROADCAST;
1447         if (inp->inp_flags & INP_ONESBCAST)
1448                 ipflags |= IP_SENDONES;
1449
1450 #ifdef MAC
1451         mac_inpcb_create_mbuf(inp, m);
1452 #endif
1453
1454         /*
1455          * Set up checksum and output datagram.
1456          */
1457         ui->ui_sum = 0;
1458         if (pr == IPPROTO_UDPLITE) {
1459                 if (inp->inp_flags & INP_ONESBCAST)
1460                         faddr.s_addr = INADDR_BROADCAST;
1461                 if (cscov_partial) {
1462                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1463                                 ui->ui_sum = 0xffff;
1464                 } else {
1465                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1466                                 ui->ui_sum = 0xffff;
1467                 }
1468         } else if (V_udp_cksum) {
1469                 if (inp->inp_flags & INP_ONESBCAST)
1470                         faddr.s_addr = INADDR_BROADCAST;
1471                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1472                     htons((u_short)len + sizeof(struct udphdr) + pr));
1473                 m->m_pkthdr.csum_flags = CSUM_UDP;
1474                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1475         }
1476         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1477         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1478         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1479         UDPSTAT_INC(udps_opackets);
1480
1481         /*
1482          * Setup flowid / RSS information for outbound socket.
1483          *
1484          * Once the UDP code decides to set a flowid some other way,
1485          * this allows the flowid to be overridden by userland.
1486          */
1487         if (flowtype != M_HASHTYPE_NONE) {
1488                 m->m_pkthdr.flowid = flowid;
1489                 M_HASHTYPE_SET(m, flowtype);
1490         }
1491 #if defined(ROUTE_MPATH) || defined(RSS)
1492         else if (CALC_FLOWID_OUTBOUND_SENDTO) {
1493                 uint32_t hash_val, hash_type;
1494
1495                 hash_val = fib4_calc_packet_hash(laddr, faddr,
1496                     lport, fport, pr, &hash_type);
1497                 m->m_pkthdr.flowid = hash_val;
1498                 M_HASHTYPE_SET(m, hash_type);
1499         }
1500
1501         /*
1502          * Don't override with the inp cached flowid value.
1503          *
1504          * Depending upon the kind of send being done, the inp
1505          * flowid/flowtype values may actually not be appropriate
1506          * for this particular socket send.
1507          *
1508          * We should either leave the flowid at zero (which is what is
1509          * currently done) or set it to some software generated
1510          * hash value based on the packet contents.
1511          */
1512         ipflags |= IP_NODEFAULTFLOWID;
1513 #endif  /* RSS */
1514
1515         if (pr == IPPROTO_UDPLITE)
1516                 UDPLITE_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1517         else
1518                 UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1519         error = ip_output(m, inp->inp_options,
1520             INP_WLOCKED(inp) ? &inp->inp_route : NULL, ipflags,
1521             inp->inp_moptions, inp);
1522         INP_UNLOCK(inp);
1523         NET_EPOCH_EXIT(et);
1524         return (error);
1525
1526 release:
1527         INP_UNLOCK(inp);
1528         NET_EPOCH_EXIT(et);
1529         m_freem(m);
1530         return (error);
1531 }
1532
1533 static void
1534 udp_abort(struct socket *so)
1535 {
1536         struct inpcb *inp;
1537         struct inpcbinfo *pcbinfo;
1538
1539         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1540         inp = sotoinpcb(so);
1541         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1542         INP_WLOCK(inp);
1543         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1544                 INP_HASH_WLOCK(pcbinfo);
1545                 in_pcbdisconnect(inp);
1546                 inp->inp_laddr.s_addr = INADDR_ANY;
1547                 INP_HASH_WUNLOCK(pcbinfo);
1548                 soisdisconnected(so);
1549         }
1550         INP_WUNLOCK(inp);
1551 }
1552
1553 static int
1554 udp_attach(struct socket *so, int proto, struct thread *td)
1555 {
1556         static uint32_t udp_flowid;
1557         struct inpcb *inp;
1558         struct inpcbinfo *pcbinfo;
1559         int error;
1560
1561         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1562         inp = sotoinpcb(so);
1563         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1564         error = soreserve(so, udp_sendspace, udp_recvspace);
1565         if (error)
1566                 return (error);
1567         INP_INFO_WLOCK(pcbinfo);
1568         error = in_pcballoc(so, pcbinfo);
1569         if (error) {
1570                 INP_INFO_WUNLOCK(pcbinfo);
1571                 return (error);
1572         }
1573
1574         inp = sotoinpcb(so);
1575         inp->inp_vflag |= INP_IPV4;
1576         inp->inp_ip_ttl = V_ip_defttl;
1577         inp->inp_flowid = atomic_fetchadd_int(&udp_flowid, 1);
1578         inp->inp_flowtype = M_HASHTYPE_OPAQUE;
1579
1580         error = udp_newudpcb(inp);
1581         if (error) {
1582                 in_pcbdetach(inp);
1583                 in_pcbfree(inp);
1584                 INP_INFO_WUNLOCK(pcbinfo);
1585                 return (error);
1586         }
1587
1588         INP_WUNLOCK(inp);
1589         INP_INFO_WUNLOCK(pcbinfo);
1590         return (0);
1591 }
1592 #endif /* INET */
1593
1594 int
1595 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1596 {
1597         struct inpcb *inp;
1598         struct udpcb *up;
1599
1600         KASSERT(so->so_type == SOCK_DGRAM,
1601             ("udp_set_kernel_tunneling: !dgram"));
1602         inp = sotoinpcb(so);
1603         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1604         INP_WLOCK(inp);
1605         up = intoudpcb(inp);
1606         if ((up->u_tun_func != NULL) ||
1607             (up->u_icmp_func != NULL)) {
1608                 INP_WUNLOCK(inp);
1609                 return (EBUSY);
1610         }
1611         up->u_tun_func = f;
1612         up->u_icmp_func = i;
1613         up->u_tun_ctx = ctx;
1614         INP_WUNLOCK(inp);
1615         return (0);
1616 }
1617
1618 #ifdef INET
1619 static int
1620 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1621 {
1622         struct inpcb *inp;
1623         struct inpcbinfo *pcbinfo;
1624         int error;
1625
1626         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1627         inp = sotoinpcb(so);
1628         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1629         INP_WLOCK(inp);
1630         INP_HASH_WLOCK(pcbinfo);
1631         error = in_pcbbind(inp, nam, td->td_ucred);
1632         INP_HASH_WUNLOCK(pcbinfo);
1633         INP_WUNLOCK(inp);
1634         return (error);
1635 }
1636
1637 static void
1638 udp_close(struct socket *so)
1639 {
1640         struct inpcb *inp;
1641         struct inpcbinfo *pcbinfo;
1642
1643         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1644         inp = sotoinpcb(so);
1645         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1646         INP_WLOCK(inp);
1647         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1648                 INP_HASH_WLOCK(pcbinfo);
1649                 in_pcbdisconnect(inp);
1650                 inp->inp_laddr.s_addr = INADDR_ANY;
1651                 INP_HASH_WUNLOCK(pcbinfo);
1652                 soisdisconnected(so);
1653         }
1654         INP_WUNLOCK(inp);
1655 }
1656
1657 static int
1658 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1659 {
1660         struct epoch_tracker et;
1661         struct inpcb *inp;
1662         struct inpcbinfo *pcbinfo;
1663         struct sockaddr_in *sin;
1664         int error;
1665
1666         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1667         inp = sotoinpcb(so);
1668         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1669         INP_WLOCK(inp);
1670         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1671                 INP_WUNLOCK(inp);
1672                 return (EISCONN);
1673         }
1674         sin = (struct sockaddr_in *)nam;
1675         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1676         if (error != 0) {
1677                 INP_WUNLOCK(inp);
1678                 return (error);
1679         }
1680         NET_EPOCH_ENTER(et);
1681         INP_HASH_WLOCK(pcbinfo);
1682         error = in_pcbconnect(inp, nam, td->td_ucred);
1683         INP_HASH_WUNLOCK(pcbinfo);
1684         NET_EPOCH_EXIT(et);
1685         if (error == 0)
1686                 soisconnected(so);
1687         INP_WUNLOCK(inp);
1688         return (error);
1689 }
1690
1691 static void
1692 udp_detach(struct socket *so)
1693 {
1694         struct inpcb *inp;
1695         struct inpcbinfo *pcbinfo;
1696         struct udpcb *up;
1697
1698         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1699         inp = sotoinpcb(so);
1700         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1701         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1702             ("udp_detach: not disconnected"));
1703         INP_INFO_WLOCK(pcbinfo);
1704         INP_WLOCK(inp);
1705         up = intoudpcb(inp);
1706         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1707         inp->inp_ppcb = NULL;
1708         in_pcbdetach(inp);
1709         in_pcbfree(inp);
1710         INP_INFO_WUNLOCK(pcbinfo);
1711         udp_discardcb(up);
1712 }
1713
1714 static int
1715 udp_disconnect(struct socket *so)
1716 {
1717         struct inpcb *inp;
1718         struct inpcbinfo *pcbinfo;
1719
1720         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1721         inp = sotoinpcb(so);
1722         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1723         INP_WLOCK(inp);
1724         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1725                 INP_WUNLOCK(inp);
1726                 return (ENOTCONN);
1727         }
1728         INP_HASH_WLOCK(pcbinfo);
1729         in_pcbdisconnect(inp);
1730         inp->inp_laddr.s_addr = INADDR_ANY;
1731         INP_HASH_WUNLOCK(pcbinfo);
1732         SOCK_LOCK(so);
1733         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1734         SOCK_UNLOCK(so);
1735         INP_WUNLOCK(inp);
1736         return (0);
1737 }
1738
1739 static int
1740 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1741     struct mbuf *control, struct thread *td)
1742 {
1743         struct inpcb *inp;
1744
1745         inp = sotoinpcb(so);
1746         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1747         return (udp_output(inp, m, addr, control, td, flags));
1748 }
1749 #endif /* INET */
1750
1751 int
1752 udp_shutdown(struct socket *so)
1753 {
1754         struct inpcb *inp;
1755
1756         inp = sotoinpcb(so);
1757         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1758         INP_WLOCK(inp);
1759         socantsendmore(so);
1760         INP_WUNLOCK(inp);
1761         return (0);
1762 }
1763
1764 #ifdef INET
1765 struct pr_usrreqs udp_usrreqs = {
1766         .pru_abort =            udp_abort,
1767         .pru_attach =           udp_attach,
1768         .pru_bind =             udp_bind,
1769         .pru_connect =          udp_connect,
1770         .pru_control =          in_control,
1771         .pru_detach =           udp_detach,
1772         .pru_disconnect =       udp_disconnect,
1773         .pru_peeraddr =         in_getpeeraddr,
1774         .pru_send =             udp_send,
1775         .pru_soreceive =        soreceive_dgram,
1776         .pru_sosend =           sosend_dgram,
1777         .pru_shutdown =         udp_shutdown,
1778         .pru_sockaddr =         in_getsockaddr,
1779         .pru_sosetlabel =       in_pcbsosetlabel,
1780         .pru_close =            udp_close,
1781 };
1782 #endif /* INET */