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_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_ipsec.h"
  45 #include "opt_rss.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/domain.h>
  49 #include <sys/eventhandler.h>
  50 #include <sys/jail.h>
  51 #include <sys/kernel.h>
  52 #include <sys/lock.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/priv.h>
  56 #include <sys/proc.h>
  57 #include <sys/protosw.h>
  58 #include <sys/sdt.h>
  59 #include <sys/signalvar.h>
  60 #include <sys/socket.h>
  61 #include <sys/socketvar.h>
  62 #include <sys/sx.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/syslog.h>
  65 #include <sys/systm.h>
  66
  67 #include <vm/uma.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_var.h>
  71 #include <net/route.h>
  72 #include <net/rss_config.h>
  73
  74 #include <netinet/in.h>
  75 #include <netinet/in_kdtrace.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/in_var.h>
  79 #include <netinet/ip.h>
  80 #ifdef INET6
  81 #include <netinet/ip6.h>
  82 #endif
  83 #include <netinet/ip_icmp.h>
  84 #include <netinet/icmp_var.h>
  85 #include <netinet/ip_var.h>
  86 #include <netinet/ip_options.h>
  87 #ifdef INET6
  88 #include <netinet6/ip6_var.h>
  89 #endif
  90 #include <netinet/udp.h>
  91 #include <netinet/udp_var.h>
  92 #include <netinet/udplite.h>
  93 #include <netinet/in_rss.h>
  94
  95 #include <netipsec/ipsec_support.h>
  96
  97 #include <machine/in_cksum.h>
  98
  99 #include <security/mac/mac_framework.h>
 100
 101 /*
 102  * UDP and UDP-Lite protocols implementation.
 103  * Per RFC 768, August, 1980.
 104  * Per RFC 3828, July, 2004.
 105  */
 106
 107 /*
 108  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 109  * removes the only data integrity mechanism for packets and malformed
 110  * packets that would otherwise be discarded due to bad checksums, and may
 111  * cause problems (especially for NFS data blocks).
 112  */
 113 VNET_DEFINE(int, udp_cksum) = 1;
 114 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 115     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 116
 117 int     udp_log_in_vain = 0;
 118 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 119     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 120
 121 VNET_DEFINE(int, udp_blackhole) = 0;
 122 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 123     &VNET_NAME(udp_blackhole), 0,
 124     "Do not send port unreachables for refused connects");
 125
 126 u_long  udp_sendspace = 9216;           /* really max datagram size */
 127 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 128     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 129
 130 u_long  udp_recvspace = 40 * (1024 +
 131 #ifdef INET6
 132                                       sizeof(struct sockaddr_in6)
 133 #else
 134                                       sizeof(struct sockaddr_in)
 135 #endif
 136                                       );        /* 40 1K datagrams */
 137
 138 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 139     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 140
 141 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 142 VNET_DEFINE(struct inpcbinfo, udbinfo);
 143 VNET_DEFINE(struct inpcbhead, ulitecb);
 144 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 145 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 146 #define V_udpcb_zone                    VNET(udpcb_zone)
 147
 148 #ifndef UDBHASHSIZE
 149 #define UDBHASHSIZE     128
 150 #endif
 151
 152 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 153 VNET_PCPUSTAT_SYSINIT(udpstat);
 154 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 155     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 156
 157 #ifdef VIMAGE
 158 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 159 #endif /* VIMAGE */
 160 #ifdef INET
 161 static void     udp_detach(struct socket *so);
 162 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 163                     struct mbuf *, struct thread *);
 164 #endif
 165
 166 static void
 167 udp_zone_change(void *tag)
 168 {
 169
 170         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 171         uma_zone_set_max(V_udpcb_zone, maxsockets);
 172 }
 173
 174 static int
 175 udp_inpcb_init(void *mem, int size, int flags)
 176 {
 177         struct inpcb *inp;
 178
 179         inp = mem;
 180         INP_LOCK_INIT(inp, "inp", "udpinp");
 181         return (0);
 182 }
 183
 184 static int
 185 udplite_inpcb_init(void *mem, int size, int flags)
 186 {
 187         struct inpcb *inp;
 188
 189         inp = mem;
 190         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 191         return (0);
 192 }
 193
 194 void
 195 udp_init(void)
 196 {
 197
 198         /*
 199          * For now default to 2-tuple UDP hashing - until the fragment
 200          * reassembly code can also update the flowid.
 201          *
 202          * Once we can calculate the flowid that way and re-establish
 203          * a 4-tuple, flip this to 4-tuple.
 204          */
 205         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 206             "udp_inpcb", udp_inpcb_init, NULL, 0,
 207             IPI_HASHFIELDS_2TUPLE);
 208         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 209             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 210         uma_zone_set_max(V_udpcb_zone, maxsockets);
 211         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 212         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 213             EVENTHANDLER_PRI_ANY);
 214 }
 215
 216 void
 217 udplite_init(void)
 218 {
 219
 220         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 221             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 222             0, IPI_HASHFIELDS_2TUPLE);
 223 }
 224
 225 /*
 226  * Kernel module interface for updating udpstat.  The argument is an index
 227  * into udpstat treated as an array of u_long.  While this encodes the
 228  * general layout of udpstat into the caller, it doesn't encode its location,
 229  * so that future changes to add, for example, per-CPU stats support won't
 230  * cause binary compatibility problems for kernel modules.
 231  */
 232 void
 233 kmod_udpstat_inc(int statnum)
 234 {
 235
 236         counter_u64_add(VNET(udpstat)[statnum], 1);
 237 }
 238
 239 int
 240 udp_newudpcb(struct inpcb *inp)
 241 {
 242         struct udpcb *up;
 243
 244         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 245         if (up == NULL)
 246                 return (ENOBUFS);
 247         inp->inp_ppcb = up;
 248         return (0);
 249 }
 250
 251 void
 252 udp_discardcb(struct udpcb *up)
 253 {
 254
 255         uma_zfree(V_udpcb_zone, up);
 256 }
 257
 258 #ifdef VIMAGE
 259 static void
 260 udp_destroy(void *unused __unused)
 261 {
 262
 263         in_pcbinfo_destroy(&V_udbinfo);
 264         uma_zdestroy(V_udpcb_zone);
 265 }
 266 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 267
 268 static void
 269 udplite_destroy(void *unused __unused)
 270 {
 271
 272         in_pcbinfo_destroy(&V_ulitecbinfo);
 273 }
 274 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 275     NULL);
 276 #endif
 277
 278 #ifdef INET
 279 /*
 280  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 281  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 282  * contains the source address.  If the socket ends up being an IPv6 socket,
 283  * udp_append() will convert to a sockaddr_in6 before passing the address
 284  * into the socket code.
 285  *
 286  * In the normal case udp_append() will return 0, indicating that you
 287  * must unlock the inp. However if a tunneling protocol is in place we increment
 288  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 289  * then decrement the reference count. If the inp_rele returns 1, indicating the
 290  * inp is gone, we return that to the caller to tell them *not* to unlock
 291  * the inp. In the case of multi-cast this will cause the distribution
 292  * to stop (though most tunneling protocols known currently do *not* use
 293  * multicast).
 294  */
 295 static int
 296 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 297     struct sockaddr_in *udp_in)
 298 {
 299         struct sockaddr *append_sa;
 300         struct socket *so;
 301         struct mbuf *opts = NULL;
 302 #ifdef INET6
 303         struct sockaddr_in6 udp_in6;
 304 #endif
 305         struct udpcb *up;
 306
 307         INP_LOCK_ASSERT(inp);
 308
 309         /*
 310          * Engage the tunneling protocol.
 311          */
 312         up = intoudpcb(inp);
 313         if (up->u_tun_func != NULL) {
 314                 in_pcbref(inp);
 315                 INP_RUNLOCK(inp);
 316                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 317                     up->u_tun_ctx);
 318                 INP_RLOCK(inp);
 319                 return (in_pcbrele_rlocked(inp));
 320         }
 321
 322         off += sizeof(struct udphdr);
 323
 324 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 325         /* Check AH/ESP integrity. */
 326         if (IPSEC_ENABLED(ipv4) &&
 327             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 328                 m_freem(n);
 329                 return (0);
 330         }
 331         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 332                 if (IPSEC_ENABLED(ipv4) &&
 333                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 334                         return (0);     /* Consumed. */
 335         }
 336 #endif /* IPSEC */
 337 #ifdef MAC
 338         if (mac_inpcb_check_deliver(inp, n) != 0) {
 339                 m_freem(n);
 340                 return (0);
 341         }
 342 #endif /* MAC */
 343         if (inp->inp_flags & INP_CONTROLOPTS ||
 344             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 345 #ifdef INET6
 346                 if (inp->inp_vflag & INP_IPV6)
 347                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 348                 else
 349 #endif /* INET6 */
 350                         ip_savecontrol(inp, &opts, ip, n);
 351         }
 352 #ifdef INET6
 353         if (inp->inp_vflag & INP_IPV6) {
 354                 bzero(&udp_in6, sizeof(udp_in6));
 355                 udp_in6.sin6_len = sizeof(udp_in6);
 356                 udp_in6.sin6_family = AF_INET6;
 357                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 358                 append_sa = (struct sockaddr *)&udp_in6;
 359         } else
 360 #endif /* INET6 */
 361                 append_sa = (struct sockaddr *)udp_in;
 362         m_adj(n, off);
 363
 364         so = inp->inp_socket;
 365         SOCKBUF_LOCK(&so->so_rcv);
 366         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 367                 SOCKBUF_UNLOCK(&so->so_rcv);
 368                 m_freem(n);
 369                 if (opts)
 370                         m_freem(opts);
 371                 UDPSTAT_INC(udps_fullsock);
 372         } else
 373                 sorwakeup_locked(so);
 374         return (0);
 375 }
 376
 377 int
 378 udp_input(struct mbuf **mp, int *offp, int proto)
 379 {
 380         struct ip *ip;
 381         struct udphdr *uh;
 382         struct ifnet *ifp;
 383         struct inpcb *inp;
 384         uint16_t len, ip_len;
 385         struct inpcbinfo *pcbinfo;
 386         struct ip save_ip;
 387         struct sockaddr_in udp_in;
 388         struct mbuf *m;
 389         struct m_tag *fwd_tag;
 390         int cscov_partial, iphlen;
 391
 392         m = *mp;
 393         iphlen = *offp;
 394         ifp = m->m_pkthdr.rcvif;
 395         *mp = NULL;
 396         UDPSTAT_INC(udps_ipackets);
 397
 398         /*
 399          * Strip IP options, if any; should skip this, make available to
 400          * user, and use on returned packets, but we don't yet have a way to
 401          * check the checksum with options still present.
 402          */
 403         if (iphlen > sizeof (struct ip)) {
 404                 ip_stripoptions(m);
 405                 iphlen = sizeof(struct ip);
 406         }
 407
 408         /*
 409          * Get IP and UDP header together in first mbuf.
 410          */
 411         ip = mtod(m, struct ip *);
 412         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 413                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 414                         UDPSTAT_INC(udps_hdrops);
 415                         return (IPPROTO_DONE);
 416                 }
 417                 ip = mtod(m, struct ip *);
 418         }
 419         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 420         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 421
 422         /*
 423          * Destination port of 0 is illegal, based on RFC768.
 424          */
 425         if (uh->uh_dport == 0)
 426                 goto badunlocked;
 427
 428         /*
 429          * Construct sockaddr format source address.  Stuff source address
 430          * and datagram in user buffer.
 431          */
 432         bzero(&udp_in, sizeof(udp_in));
 433         udp_in.sin_len = sizeof(udp_in);
 434         udp_in.sin_family = AF_INET;
 435         udp_in.sin_port = uh->uh_sport;
 436         udp_in.sin_addr = ip->ip_src;
 437
 438         /*
 439          * Make mbuf data length reflect UDP length.  If not enough data to
 440          * reflect UDP length, drop.
 441          */
 442         len = ntohs((u_short)uh->uh_ulen);
 443         ip_len = ntohs(ip->ip_len) - iphlen;
 444         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 445                 /* Zero means checksum over the complete packet. */
 446                 if (len == 0)
 447                         len = ip_len;
 448                 cscov_partial = 0;
 449         }
 450         if (ip_len != len) {
 451                 if (len > ip_len || len < sizeof(struct udphdr)) {
 452                         UDPSTAT_INC(udps_badlen);
 453                         goto badunlocked;
 454                 }
 455                 if (proto == IPPROTO_UDP)
 456                         m_adj(m, len - ip_len);
 457         }
 458
 459         /*
 460          * Save a copy of the IP header in case we want restore it for
 461          * sending an ICMP error message in response.
 462          */
 463         if (!V_udp_blackhole)
 464                 save_ip = *ip;
 465         else
 466                 memset(&save_ip, 0, sizeof(save_ip));
 467
 468         /*
 469          * Checksum extended UDP header and data.
 470          */
 471         if (uh->uh_sum) {
 472                 u_short uh_sum;
 473
 474                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 475                     !cscov_partial) {
 476                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 477                                 uh_sum = m->m_pkthdr.csum_data;
 478                         else
 479                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 480                                     ip->ip_dst.s_addr, htonl((u_short)len +
 481                                     m->m_pkthdr.csum_data + proto));
 482                         uh_sum ^= 0xffff;
 483                 } else {
 484                         char b[9];
 485
 486                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 487                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 488                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 489                             uh->uh_ulen : htons(ip_len);
 490                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 491                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 492                 }
 493                 if (uh_sum) {
 494                         UDPSTAT_INC(udps_badsum);
 495                         m_freem(m);
 496                         return (IPPROTO_DONE);
 497                 }
 498         } else {
 499                 if (proto == IPPROTO_UDP) {
 500                         UDPSTAT_INC(udps_nosum);
 501                 } else {
 502                         /* UDPLite requires a checksum */
 503                         /* XXX: What is the right UDPLite MIB counter here? */
 504                         m_freem(m);
 505                         return (IPPROTO_DONE);
 506                 }
 507         }
 508
 509         pcbinfo = udp_get_inpcbinfo(proto);
 510         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 511             in_broadcast(ip->ip_dst, ifp)) {
 512                 struct inpcb *last;
 513                 struct inpcbhead *pcblist;
 514                 struct ip_moptions *imo;
 515
 516                 INP_INFO_RLOCK(pcbinfo);
 517                 pcblist = udp_get_pcblist(proto);
 518                 last = NULL;
 519                 LIST_FOREACH(inp, pcblist, inp_list) {
 520                         if (inp->inp_lport != uh->uh_dport)
 521                                 continue;
 522 #ifdef INET6
 523                         if ((inp->inp_vflag & INP_IPV4) == 0)
 524                                 continue;
 525 #endif
 526                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 527                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 528                                 continue;
 529                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 530                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 531                                 continue;
 532                         if (inp->inp_fport != 0 &&
 533                             inp->inp_fport != uh->uh_sport)
 534                                 continue;
 535
 536                         INP_RLOCK(inp);
 537
 538                         /*
 539                          * XXXRW: Because we weren't holding either the inpcb
 540                          * or the hash lock when we checked for a match
 541                          * before, we should probably recheck now that the
 542                          * inpcb lock is held.
 543                          */
 544
 545                         /*
 546                          * Handle socket delivery policy for any-source
 547                          * and source-specific multicast. [RFC3678]
 548                          */
 549                         imo = inp->inp_moptions;
 550                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 551                                 struct sockaddr_in       group;
 552                                 int                      blocked;
 553                                 if (imo == NULL) {
 554                                         INP_RUNLOCK(inp);
 555                                         continue;
 556                                 }
 557                                 bzero(&group, sizeof(struct sockaddr_in));
 558                                 group.sin_len = sizeof(struct sockaddr_in);
 559                                 group.sin_family = AF_INET;
 560                                 group.sin_addr = ip->ip_dst;
 561
 562                                 blocked = imo_multi_filter(imo, ifp,
 563                                         (struct sockaddr *)&group,
 564                                         (struct sockaddr *)&udp_in);
 565                                 if (blocked != MCAST_PASS) {
 566                                         if (blocked == MCAST_NOTGMEMBER)
 567                                                 IPSTAT_INC(ips_notmember);
 568                                         if (blocked == MCAST_NOTSMEMBER ||
 569                                             blocked == MCAST_MUTED)
 570                                                 UDPSTAT_INC(udps_filtermcast);
 571                                         INP_RUNLOCK(inp);
 572                                         continue;
 573                                 }
 574                         }
 575                         if (last != NULL) {
 576                                 struct mbuf *n;
 577
 578                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 579                                         UDP_PROBE(receive, NULL, last, ip,
 580                                             last, uh);
 581                                         if (udp_append(last, ip, n, iphlen,
 582                                                 &udp_in)) {
 583                                                 goto inp_lost;
 584                                         }
 585                                 }
 586                                 INP_RUNLOCK(last);
 587                         }
 588                         last = inp;
 589                         /*
 590                          * Don't look for additional matches if this one does
 591                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 592                          * socket options set.  This heuristic avoids
 593                          * searching through all pcbs in the common case of a
 594                          * non-shared port.  It assumes that an application
 595                          * will never clear these options after setting them.
 596                          */
 597                         if ((last->inp_socket->so_options &
 598                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 599                                 break;
 600                 }
 601
 602                 if (last == NULL) {
 603                         /*
 604                          * No matching pcb found; discard datagram.  (No need
 605                          * to send an ICMP Port Unreachable for a broadcast
 606                          * or multicast datgram.)
 607                          */
 608                         UDPSTAT_INC(udps_noportbcast);
 609                         if (inp)
 610                                 INP_RUNLOCK(inp);
 611                         INP_INFO_RUNLOCK(pcbinfo);
 612                         goto badunlocked;
 613                 }
 614                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 615                 if (udp_append(last, ip, m, iphlen, &udp_in) == 0)
 616                         INP_RUNLOCK(last);
 617         inp_lost:
 618                 INP_INFO_RUNLOCK(pcbinfo);
 619                 return (IPPROTO_DONE);
 620         }
 621
 622         /*
 623          * Locate pcb for datagram.
 624          */
 625
 626         /*
 627          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 628          */
 629         if ((m->m_flags & M_IP_NEXTHOP) &&
 630             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 631                 struct sockaddr_in *next_hop;
 632
 633                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 634
 635                 /*
 636                  * Transparently forwarded. Pretend to be the destination.
 637                  * Already got one like this?
 638                  */
 639                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 640                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 641                 if (!inp) {
 642                         /*
 643                          * It's new.  Try to find the ambushing socket.
 644                          * Because we've rewritten the destination address,
 645                          * any hardware-generated hash is ignored.
 646                          */
 647                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 648                             uh->uh_sport, next_hop->sin_addr,
 649                             next_hop->sin_port ? htons(next_hop->sin_port) :
 650                             uh->uh_dport, INPLOOKUP_WILDCARD |
 651                             INPLOOKUP_RLOCKPCB, ifp);
 652                 }
 653                 /* Remove the tag from the packet. We don't need it anymore. */
 654                 m_tag_delete(m, fwd_tag);
 655                 m->m_flags &= ~M_IP_NEXTHOP;
 656         } else
 657                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 658                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 659                     INPLOOKUP_RLOCKPCB, ifp, m);
 660         if (inp == NULL) {
 661                 if (udp_log_in_vain) {
 662                         char src[INET_ADDRSTRLEN];
 663                         char dst[INET_ADDRSTRLEN];
 664
 665                         log(LOG_INFO,
 666                             "Connection attempt to UDP %s:%d from %s:%d\n",
 667                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 668                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 669                 }
 670                 UDP_PROBE(receive, NULL, NULL, ip, NULL, uh);
 671                 UDPSTAT_INC(udps_noport);
 672                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 673                         UDPSTAT_INC(udps_noportbcast);
 674                         goto badunlocked;
 675                 }
 676                 if (V_udp_blackhole)
 677                         goto badunlocked;
 678                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 679                         goto badunlocked;
 680                 *ip = save_ip;
 681                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 682                 return (IPPROTO_DONE);
 683         }
 684
 685         /*
 686          * Check the minimum TTL for socket.
 687          */
 688         INP_RLOCK_ASSERT(inp);
 689         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 690                 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 691                 INP_RUNLOCK(inp);
 692                 m_freem(m);
 693                 return (IPPROTO_DONE);
 694         }
 695         if (cscov_partial) {
 696                 struct udpcb *up;
 697
 698                 up = intoudpcb(inp);
 699                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 700                         INP_RUNLOCK(inp);
 701                         m_freem(m);
 702                         return (IPPROTO_DONE);
 703                 }
 704         }
 705
 706         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 707         if (udp_append(inp, ip, m, iphlen, &udp_in) == 0)
 708                 INP_RUNLOCK(inp);
 709         return (IPPROTO_DONE);
 710
 711 badunlocked:
 712         m_freem(m);
 713         return (IPPROTO_DONE);
 714 }
 715 #endif /* INET */
 716
 717 /*
 718  * Notify a udp user of an asynchronous error; just wake up so that they can
 719  * collect error status.
 720  */
 721 struct inpcb *
 722 udp_notify(struct inpcb *inp, int errno)
 723 {
 724
 725         /*
 726          * While udp_ctlinput() always calls udp_notify() with a read lock
 727          * when invoking it directly, in_pcbnotifyall() currently uses write
 728          * locks due to sharing code with TCP.  For now, accept either a read
 729          * or a write lock, but a read lock is sufficient.
 730          */
 731         INP_LOCK_ASSERT(inp);
 732         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 733              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 734                 RTFREE(inp->inp_route.ro_rt);
 735                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 736         }
 737
 738         inp->inp_socket->so_error = errno;
 739         sorwakeup(inp->inp_socket);
 740         sowwakeup(inp->inp_socket);
 741         return (inp);
 742 }
 743
 744 #ifdef INET
 745 static void
 746 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 747     struct inpcbinfo *pcbinfo)
 748 {
 749         struct ip *ip = vip;
 750         struct udphdr *uh;
 751         struct in_addr faddr;
 752         struct inpcb *inp;
 753
 754         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 755         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 756                 return;
 757
 758         if (PRC_IS_REDIRECT(cmd)) {
 759                 /* signal EHOSTDOWN, as it flushes the cached route */
 760                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 761                 return;
 762         }
 763
 764         /*
 765          * Hostdead is ugly because it goes linearly through all PCBs.
 766          *
 767          * XXX: We never get this from ICMP, otherwise it makes an excellent
 768          * DoS attack on machines with many connections.
 769          */
 770         if (cmd == PRC_HOSTDEAD)
 771                 ip = NULL;
 772         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 773                 return;
 774         if (ip != NULL) {
 775                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 776                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 777                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 778                 if (inp != NULL) {
 779                         INP_RLOCK_ASSERT(inp);
 780                         if (inp->inp_socket != NULL) {
 781                                 udp_notify(inp, inetctlerrmap[cmd]);
 782                         }
 783                         INP_RUNLOCK(inp);
 784                 } else {
 785                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 786                                            ip->ip_src, uh->uh_sport,
 787                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 788                         if (inp != NULL) {
 789                                 struct udpcb *up;
 790
 791                                 up = intoudpcb(inp);
 792                                 if (up->u_icmp_func != NULL) {
 793                                         INP_RUNLOCK(inp);
 794                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
 795                                 } else {
 796                                         INP_RUNLOCK(inp);
 797                                 }
 798                         }
 799                 }
 800         } else
 801                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 802                     udp_notify);
 803 }
 804 void
 805 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 806 {
 807
 808         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 809 }
 810
 811 void
 812 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 813 {
 814
 815         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 816 }
 817 #endif /* INET */
 818
 819 static int
 820 udp_pcblist(SYSCTL_HANDLER_ARGS)
 821 {
 822         int error, i, n;
 823         struct inpcb *inp, **inp_list;
 824         inp_gen_t gencnt;
 825         struct xinpgen xig;
 826
 827         /*
 828          * The process of preparing the PCB list is too time-consuming and
 829          * resource-intensive to repeat twice on every request.
 830          */
 831         if (req->oldptr == 0) {
 832                 n = V_udbinfo.ipi_count;
 833                 n += imax(n / 8, 10);
 834                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 835                 return (0);
 836         }
 837
 838         if (req->newptr != 0)
 839                 return (EPERM);
 840
 841         /*
 842          * OK, now we're committed to doing something.
 843          */
 844         INP_INFO_RLOCK(&V_udbinfo);
 845         gencnt = V_udbinfo.ipi_gencnt;
 846         n = V_udbinfo.ipi_count;
 847         INP_INFO_RUNLOCK(&V_udbinfo);
 848
 849         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 850                 + n * sizeof(struct xinpcb));
 851         if (error != 0)
 852                 return (error);
 853
 854         bzero(&xig, sizeof(xig));
 855         xig.xig_len = sizeof xig;
 856         xig.xig_count = n;
 857         xig.xig_gen = gencnt;
 858         xig.xig_sogen = so_gencnt;
 859         error = SYSCTL_OUT(req, &xig, sizeof xig);
 860         if (error)
 861                 return (error);
 862
 863         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 864         if (inp_list == NULL)
 865                 return (ENOMEM);
 866
 867         INP_INFO_RLOCK(&V_udbinfo);
 868         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 869              inp = LIST_NEXT(inp, inp_list)) {
 870                 INP_WLOCK(inp);
 871                 if (inp->inp_gencnt <= gencnt &&
 872                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 873                         in_pcbref(inp);
 874                         inp_list[i++] = inp;
 875                 }
 876                 INP_WUNLOCK(inp);
 877         }
 878         INP_INFO_RUNLOCK(&V_udbinfo);
 879         n = i;
 880
 881         error = 0;
 882         for (i = 0; i < n; i++) {
 883                 inp = inp_list[i];
 884                 INP_RLOCK(inp);
 885                 if (inp->inp_gencnt <= gencnt) {
 886                         struct xinpcb xi;
 887
 888                         bzero(&xi, sizeof(xi));
 889                         xi.xi_len = sizeof xi;
 890                         /* XXX should avoid extra copy */
 891                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 892                         if (inp->inp_socket)
 893                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 894                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 895                         INP_RUNLOCK(inp);
 896                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 897                 } else
 898                         INP_RUNLOCK(inp);
 899         }
 900         INP_INFO_WLOCK(&V_udbinfo);
 901         for (i = 0; i < n; i++) {
 902                 inp = inp_list[i];
 903                 INP_RLOCK(inp);
 904                 if (!in_pcbrele_rlocked(inp))
 905                         INP_RUNLOCK(inp);
 906         }
 907         INP_INFO_WUNLOCK(&V_udbinfo);
 908
 909         if (!error) {
 910                 /*
 911                  * Give the user an updated idea of our state.  If the
 912                  * generation differs from what we told her before, she knows
 913                  * that something happened while we were processing this
 914                  * request, and it might be necessary to retry.
 915                  */
 916                 INP_INFO_RLOCK(&V_udbinfo);
 917                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 918                 xig.xig_sogen = so_gencnt;
 919                 xig.xig_count = V_udbinfo.ipi_count;
 920                 INP_INFO_RUNLOCK(&V_udbinfo);
 921                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 922         }
 923         free(inp_list, M_TEMP);
 924         return (error);
 925 }
 926
 927 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 928     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 929     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 930
 931 #ifdef INET
 932 static int
 933 udp_getcred(SYSCTL_HANDLER_ARGS)
 934 {
 935         struct xucred xuc;
 936         struct sockaddr_in addrs[2];
 937         struct inpcb *inp;
 938         int error;
 939
 940         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 941         if (error)
 942                 return (error);
 943         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 944         if (error)
 945                 return (error);
 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         if (inp != NULL) {
 950                 INP_RLOCK_ASSERT(inp);
 951                 if (inp->inp_socket == NULL)
 952                         error = ENOENT;
 953                 if (error == 0)
 954                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 955                 if (error == 0)
 956                         cru2x(inp->inp_cred, &xuc);
 957                 INP_RUNLOCK(inp);
 958         } else
 959                 error = ENOENT;
 960         if (error == 0)
 961                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 962         return (error);
 963 }
 964
 965 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 966     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 967     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 968 #endif /* INET */
 969
 970 int
 971 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 972 {
 973         struct inpcb *inp;
 974         struct udpcb *up;
 975         int isudplite, error, optval;
 976
 977         error = 0;
 978         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 979         inp = sotoinpcb(so);
 980         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 981         INP_WLOCK(inp);
 982         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 983 #ifdef INET6
 984                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 985                         INP_WUNLOCK(inp);
 986                         error = ip6_ctloutput(so, sopt);
 987                 }
 988 #endif
 989 #if defined(INET) && defined(INET6)
 990                 else
 991 #endif
 992 #ifdef INET
 993                 {
 994                         INP_WUNLOCK(inp);
 995                         error = ip_ctloutput(so, sopt);
 996                 }
 997 #endif
 998                 return (error);
 999         }
1000
1001         switch (sopt->sopt_dir) {
1002         case SOPT_SET:
1003                 switch (sopt->sopt_name) {
1004 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1005 #ifdef INET
1006                 case UDP_ENCAP:
1007                         if (!IPSEC_ENABLED(ipv4)) {
1008                                 INP_WUNLOCK(inp);
1009                                 return (ENOPROTOOPT);
1010                         }
1011                         error = UDPENCAP_PCBCTL(inp, sopt);
1012                         break;
1013 #endif /* INET */
1014 #endif /* IPSEC */
1015                 case UDPLITE_SEND_CSCOV:
1016                 case UDPLITE_RECV_CSCOV:
1017                         if (!isudplite) {
1018                                 INP_WUNLOCK(inp);
1019                                 error = ENOPROTOOPT;
1020                                 break;
1021                         }
1022                         INP_WUNLOCK(inp);
1023                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1024                             sizeof(optval));
1025                         if (error != 0)
1026                                 break;
1027                         inp = sotoinpcb(so);
1028                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1029                         INP_WLOCK(inp);
1030                         up = intoudpcb(inp);
1031                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1032                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1033                                 INP_WUNLOCK(inp);
1034                                 error = EINVAL;
1035                                 break;
1036                         }
1037                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1038                                 up->u_txcslen = optval;
1039                         else
1040                                 up->u_rxcslen = optval;
1041                         INP_WUNLOCK(inp);
1042                         break;
1043                 default:
1044                         INP_WUNLOCK(inp);
1045                         error = ENOPROTOOPT;
1046                         break;
1047                 }
1048                 break;
1049         case SOPT_GET:
1050                 switch (sopt->sopt_name) {
1051 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1052 #ifdef INET
1053                 case UDP_ENCAP:
1054                         if (!IPSEC_ENABLED(ipv4)) {
1055                                 INP_WUNLOCK(inp);
1056                                 return (ENOPROTOOPT);
1057                         }
1058                         error = UDPENCAP_PCBCTL(inp, sopt);
1059                         break;
1060 #endif /* INET */
1061 #endif /* IPSEC */
1062                 case UDPLITE_SEND_CSCOV:
1063                 case UDPLITE_RECV_CSCOV:
1064                         if (!isudplite) {
1065                                 INP_WUNLOCK(inp);
1066                                 error = ENOPROTOOPT;
1067                                 break;
1068                         }
1069                         up = intoudpcb(inp);
1070                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1071                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1072                                 optval = up->u_txcslen;
1073                         else
1074                                 optval = up->u_rxcslen;
1075                         INP_WUNLOCK(inp);
1076                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1077                         break;
1078                 default:
1079                         INP_WUNLOCK(inp);
1080                         error = ENOPROTOOPT;
1081                         break;
1082                 }
1083                 break;
1084         }
1085         return (error);
1086 }
1087
1088 #ifdef INET
1089 #define UH_WLOCKED      2
1090 #define UH_RLOCKED      1
1091 #define UH_UNLOCKED     0
1092 static int
1093 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1094     struct mbuf *control, struct thread *td)
1095 {
1096         struct udpiphdr *ui;
1097         int len = m->m_pkthdr.len;
1098         struct in_addr faddr, laddr;
1099         struct cmsghdr *cm;
1100         struct inpcbinfo *pcbinfo;
1101         struct sockaddr_in *sin, src;
1102         int cscov_partial = 0;
1103         int error = 0;
1104         int ipflags;
1105         u_short fport, lport;
1106         int unlock_udbinfo, unlock_inp;
1107         u_char tos;
1108         uint8_t pr;
1109         uint16_t cscov = 0;
1110         uint32_t flowid = 0;
1111         uint8_t flowtype = M_HASHTYPE_NONE;
1112
1113         /*
1114          * udp_output() may need to temporarily bind or connect the current
1115          * inpcb.  As such, we don't know up front whether we will need the
1116          * pcbinfo lock or not.  Do any work to decide what is needed up
1117          * front before acquiring any locks.
1118          */
1119         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1120                 if (control)
1121                         m_freem(control);
1122                 m_freem(m);
1123                 return (EMSGSIZE);
1124         }
1125
1126         src.sin_family = 0;
1127         sin = (struct sockaddr_in *)addr;
1128         if (sin == NULL ||
1129             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1130                 INP_WLOCK(inp);
1131                 unlock_inp = UH_WLOCKED;
1132         } else {
1133                 INP_RLOCK(inp);
1134                 unlock_inp = UH_RLOCKED;
1135         }
1136         tos = inp->inp_ip_tos;
1137         if (control != NULL) {
1138                 /*
1139                  * XXX: Currently, we assume all the optional information is
1140                  * stored in a single mbuf.
1141                  */
1142                 if (control->m_next) {
1143                         if (unlock_inp == UH_WLOCKED)
1144                                 INP_WUNLOCK(inp);
1145                         else
1146                                 INP_RUNLOCK(inp);
1147                         m_freem(control);
1148                         m_freem(m);
1149                         return (EINVAL);
1150                 }
1151                 for (; control->m_len > 0;
1152                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1153                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1154                         cm = mtod(control, struct cmsghdr *);
1155                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1156                             || cm->cmsg_len > control->m_len) {
1157                                 error = EINVAL;
1158                                 break;
1159                         }
1160                         if (cm->cmsg_level != IPPROTO_IP)
1161                                 continue;
1162
1163                         switch (cm->cmsg_type) {
1164                         case IP_SENDSRCADDR:
1165                                 if (cm->cmsg_len !=
1166                                     CMSG_LEN(sizeof(struct in_addr))) {
1167                                         error = EINVAL;
1168                                         break;
1169                                 }
1170                                 bzero(&src, sizeof(src));
1171                                 src.sin_family = AF_INET;
1172                                 src.sin_len = sizeof(src);
1173                                 src.sin_port = inp->inp_lport;
1174                                 src.sin_addr =
1175                                     *(struct in_addr *)CMSG_DATA(cm);
1176                                 break;
1177
1178                         case IP_TOS:
1179                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1180                                         error = EINVAL;
1181                                         break;
1182                                 }
1183                                 tos = *(u_char *)CMSG_DATA(cm);
1184                                 break;
1185
1186                         case IP_FLOWID:
1187                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1188                                         error = EINVAL;
1189                                         break;
1190                                 }
1191                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1192                                 break;
1193
1194                         case IP_FLOWTYPE:
1195                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1196                                         error = EINVAL;
1197                                         break;
1198                                 }
1199                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1200                                 break;
1201
1202 #ifdef  RSS
1203                         case IP_RSSBUCKETID:
1204                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1205                                         error = EINVAL;
1206                                         break;
1207                                 }
1208                                 /* This is just a placeholder for now */
1209                                 break;
1210 #endif  /* RSS */
1211                         default:
1212                                 error = ENOPROTOOPT;
1213                                 break;
1214                         }
1215                         if (error)
1216                                 break;
1217                 }
1218                 m_freem(control);
1219         }
1220         if (error) {
1221                 if (unlock_inp == UH_WLOCKED)
1222                         INP_WUNLOCK(inp);
1223                 else
1224                         INP_RUNLOCK(inp);
1225                 m_freem(m);
1226                 return (error);
1227         }
1228
1229         /*
1230          * Depending on whether or not the application has bound or connected
1231          * the socket, we may have to do varying levels of work.  The optimal
1232          * case is for a connected UDP socket, as a global lock isn't
1233          * required at all.
1234          *
1235          * In order to decide which we need, we require stability of the
1236          * inpcb binding, which we ensure by acquiring a read lock on the
1237          * inpcb.  This doesn't strictly follow the lock order, so we play
1238          * the trylock and retry game; note that we may end up with more
1239          * conservative locks than required the second time around, so later
1240          * assertions have to accept that.  Further analysis of the number of
1241          * misses under contention is required.
1242          *
1243          * XXXRW: Check that hash locking update here is correct.
1244          */
1245         pr = inp->inp_socket->so_proto->pr_protocol;
1246         pcbinfo = udp_get_inpcbinfo(pr);
1247         sin = (struct sockaddr_in *)addr;
1248         if (sin != NULL &&
1249             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1250                 INP_HASH_WLOCK(pcbinfo);
1251                 unlock_udbinfo = UH_WLOCKED;
1252         } else if ((sin != NULL && (
1253             (sin->sin_addr.s_addr == INADDR_ANY) ||
1254             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1255             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1256             (inp->inp_lport == 0))) ||
1257             (src.sin_family == AF_INET)) {
1258                 INP_HASH_RLOCK(pcbinfo);
1259                 unlock_udbinfo = UH_RLOCKED;
1260         } else
1261                 unlock_udbinfo = UH_UNLOCKED;
1262
1263         /*
1264          * If the IP_SENDSRCADDR control message was specified, override the
1265          * source address for this datagram.  Its use is invalidated if the
1266          * address thus specified is incomplete or clobbers other inpcbs.
1267          */
1268         laddr = inp->inp_laddr;
1269         lport = inp->inp_lport;
1270         if (src.sin_family == AF_INET) {
1271                 INP_HASH_LOCK_ASSERT(pcbinfo);
1272                 if ((lport == 0) ||
1273                     (laddr.s_addr == INADDR_ANY &&
1274                      src.sin_addr.s_addr == INADDR_ANY)) {
1275                         error = EINVAL;
1276                         goto release;
1277                 }
1278                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1279                     &laddr.s_addr, &lport, td->td_ucred);
1280                 if (error)
1281                         goto release;
1282         }
1283
1284         /*
1285          * If a UDP socket has been connected, then a local address/port will
1286          * have been selected and bound.
1287          *
1288          * If a UDP socket has not been connected to, then an explicit
1289          * destination address must be used, in which case a local
1290          * address/port may not have been selected and bound.
1291          */
1292         if (sin != NULL) {
1293                 INP_LOCK_ASSERT(inp);
1294                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1295                         error = EISCONN;
1296                         goto release;
1297                 }
1298
1299                 /*
1300                  * Jail may rewrite the destination address, so let it do
1301                  * that before we use it.
1302                  */
1303                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1304                 if (error)
1305                         goto release;
1306
1307                 /*
1308                  * If a local address or port hasn't yet been selected, or if
1309                  * the destination address needs to be rewritten due to using
1310                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1311                  * to do the heavy lifting.  Once a port is selected, we
1312                  * commit the binding back to the socket; we also commit the
1313                  * binding of the address if in jail.
1314                  *
1315                  * If we already have a valid binding and we're not
1316                  * requesting a destination address rewrite, use a fast path.
1317                  */
1318                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1319                     inp->inp_lport == 0 ||
1320                     sin->sin_addr.s_addr == INADDR_ANY ||
1321                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1322                         INP_HASH_LOCK_ASSERT(pcbinfo);
1323                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1324                             &lport, &faddr.s_addr, &fport, NULL,
1325                             td->td_ucred);
1326                         if (error)
1327                                 goto release;
1328
1329                         /*
1330                          * XXXRW: Why not commit the port if the address is
1331                          * !INADDR_ANY?
1332                          */
1333                         /* Commit the local port if newly assigned. */
1334                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1335                             inp->inp_lport == 0) {
1336                                 INP_WLOCK_ASSERT(inp);
1337                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1338                                 /*
1339                                  * Remember addr if jailed, to prevent
1340                                  * rebinding.
1341                                  */
1342                                 if (prison_flag(td->td_ucred, PR_IP4))
1343                                         inp->inp_laddr = laddr;
1344                                 inp->inp_lport = lport;
1345                                 if (in_pcbinshash(inp) != 0) {
1346                                         inp->inp_lport = 0;
1347                                         error = EAGAIN;
1348                                         goto release;
1349                                 }
1350                                 inp->inp_flags |= INP_ANONPORT;
1351                         }
1352                 } else {
1353                         faddr = sin->sin_addr;
1354                         fport = sin->sin_port;
1355                 }
1356         } else {
1357                 INP_LOCK_ASSERT(inp);
1358                 faddr = inp->inp_faddr;
1359                 fport = inp->inp_fport;
1360                 if (faddr.s_addr == INADDR_ANY) {
1361                         error = ENOTCONN;
1362                         goto release;
1363                 }
1364         }
1365
1366         /*
1367          * Calculate data length and get a mbuf for UDP, IP, and possible
1368          * link-layer headers.  Immediate slide the data pointer back forward
1369          * since we won't use that space at this layer.
1370          */
1371         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1372         if (m == NULL) {
1373                 error = ENOBUFS;
1374                 goto release;
1375         }
1376         m->m_data += max_linkhdr;
1377         m->m_len -= max_linkhdr;
1378         m->m_pkthdr.len -= max_linkhdr;
1379
1380         /*
1381          * Fill in mbuf with extended UDP header and addresses and length put
1382          * into network format.
1383          */
1384         ui = mtod(m, struct udpiphdr *);
1385         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1386         ui->ui_v = IPVERSION << 4;
1387         ui->ui_pr = pr;
1388         ui->ui_src = laddr;
1389         ui->ui_dst = faddr;
1390         ui->ui_sport = lport;
1391         ui->ui_dport = fport;
1392         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1393         if (pr == IPPROTO_UDPLITE) {
1394                 struct udpcb *up;
1395                 uint16_t plen;
1396
1397                 up = intoudpcb(inp);
1398                 cscov = up->u_txcslen;
1399                 plen = (u_short)len + sizeof(struct udphdr);
1400                 if (cscov >= plen)
1401                         cscov = 0;
1402                 ui->ui_len = htons(plen);
1403                 ui->ui_ulen = htons(cscov);
1404                 /*
1405                  * For UDP-Lite, checksum coverage length of zero means
1406                  * the entire UDPLite packet is covered by the checksum.
1407                  */
1408                 cscov_partial = (cscov == 0) ? 0 : 1;
1409         }
1410
1411         /*
1412          * Set the Don't Fragment bit in the IP header.
1413          */
1414         if (inp->inp_flags & INP_DONTFRAG) {
1415                 struct ip *ip;
1416
1417                 ip = (struct ip *)&ui->ui_i;
1418                 ip->ip_off |= htons(IP_DF);
1419         }
1420
1421         ipflags = 0;
1422         if (inp->inp_socket->so_options & SO_DONTROUTE)
1423                 ipflags |= IP_ROUTETOIF;
1424         if (inp->inp_socket->so_options & SO_BROADCAST)
1425                 ipflags |= IP_ALLOWBROADCAST;
1426         if (inp->inp_flags & INP_ONESBCAST)
1427                 ipflags |= IP_SENDONES;
1428
1429 #ifdef MAC
1430         mac_inpcb_create_mbuf(inp, m);
1431 #endif
1432
1433         /*
1434          * Set up checksum and output datagram.
1435          */
1436         ui->ui_sum = 0;
1437         if (pr == IPPROTO_UDPLITE) {
1438                 if (inp->inp_flags & INP_ONESBCAST)
1439                         faddr.s_addr = INADDR_BROADCAST;
1440                 if (cscov_partial) {
1441                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1442                                 ui->ui_sum = 0xffff;
1443                 } else {
1444                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1445                                 ui->ui_sum = 0xffff;
1446                 }
1447         } else if (V_udp_cksum) {
1448                 if (inp->inp_flags & INP_ONESBCAST)
1449                         faddr.s_addr = INADDR_BROADCAST;
1450                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1451                     htons((u_short)len + sizeof(struct udphdr) + pr));
1452                 m->m_pkthdr.csum_flags = CSUM_UDP;
1453                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1454         }
1455         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1456         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1457         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1458         UDPSTAT_INC(udps_opackets);
1459
1460         /*
1461          * Setup flowid / RSS information for outbound socket.
1462          *
1463          * Once the UDP code decides to set a flowid some other way,
1464          * this allows the flowid to be overridden by userland.
1465          */
1466         if (flowtype != M_HASHTYPE_NONE) {
1467                 m->m_pkthdr.flowid = flowid;
1468                 M_HASHTYPE_SET(m, flowtype);
1469 #ifdef  RSS
1470         } else {
1471                 uint32_t hash_val, hash_type;
1472                 /*
1473                  * Calculate an appropriate RSS hash for UDP and
1474                  * UDP Lite.
1475                  *
1476                  * The called function will take care of figuring out
1477                  * whether a 2-tuple or 4-tuple hash is required based
1478                  * on the currently configured scheme.
1479                  *
1480                  * Later later on connected socket values should be
1481                  * cached in the inpcb and reused, rather than constantly
1482                  * re-calculating it.
1483                  *
1484                  * UDP Lite is a different protocol number and will
1485                  * likely end up being hashed as a 2-tuple until
1486                  * RSS / NICs grow UDP Lite protocol awareness.
1487                  */
1488                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1489                     pr, &hash_val, &hash_type) == 0) {
1490                         m->m_pkthdr.flowid = hash_val;
1491                         M_HASHTYPE_SET(m, hash_type);
1492                 }
1493 #endif
1494         }
1495
1496 #ifdef  RSS
1497         /*
1498          * Don't override with the inp cached flowid value.
1499          *
1500          * Depending upon the kind of send being done, the inp
1501          * flowid/flowtype values may actually not be appropriate
1502          * for this particular socket send.
1503          *
1504          * We should either leave the flowid at zero (which is what is
1505          * currently done) or set it to some software generated
1506          * hash value based on the packet contents.
1507          */
1508         ipflags |= IP_NODEFAULTFLOWID;
1509 #endif  /* RSS */
1510
1511         if (unlock_udbinfo == UH_WLOCKED)
1512                 INP_HASH_WUNLOCK(pcbinfo);
1513         else if (unlock_udbinfo == UH_RLOCKED)
1514                 INP_HASH_RUNLOCK(pcbinfo);
1515         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1516         error = ip_output(m, inp->inp_options,
1517             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1518             inp->inp_moptions, inp);
1519         if (unlock_inp == UH_WLOCKED)
1520                 INP_WUNLOCK(inp);
1521         else
1522                 INP_RUNLOCK(inp);
1523         return (error);
1524
1525 release:
1526         if (unlock_udbinfo == UH_WLOCKED) {
1527                 KASSERT(unlock_inp == UH_WLOCKED,
1528                     ("%s: excl udbinfo lock, shared inp lock", __func__));
1529                 INP_HASH_WUNLOCK(pcbinfo);
1530                 INP_WUNLOCK(inp);
1531         } else if (unlock_udbinfo == UH_RLOCKED) {
1532                 KASSERT(unlock_inp == UH_RLOCKED,
1533                     ("%s: shared udbinfo lock, excl inp lock", __func__));
1534                 INP_HASH_RUNLOCK(pcbinfo);
1535                 INP_RUNLOCK(inp);
1536         } else if (unlock_inp == UH_WLOCKED)
1537                 INP_WUNLOCK(inp);
1538         else
1539                 INP_RUNLOCK(inp);
1540         m_freem(m);
1541         return (error);
1542 }
1543
1544 static void
1545 udp_abort(struct socket *so)
1546 {
1547         struct inpcb *inp;
1548         struct inpcbinfo *pcbinfo;
1549
1550         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1551         inp = sotoinpcb(so);
1552         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1553         INP_WLOCK(inp);
1554         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1555                 INP_HASH_WLOCK(pcbinfo);
1556                 in_pcbdisconnect(inp);
1557                 inp->inp_laddr.s_addr = INADDR_ANY;
1558                 INP_HASH_WUNLOCK(pcbinfo);
1559                 soisdisconnected(so);
1560         }
1561         INP_WUNLOCK(inp);
1562 }
1563
1564 static int
1565 udp_attach(struct socket *so, int proto, struct thread *td)
1566 {
1567         struct inpcb *inp;
1568         struct inpcbinfo *pcbinfo;
1569         int error;
1570
1571         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1572         inp = sotoinpcb(so);
1573         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1574         error = soreserve(so, udp_sendspace, udp_recvspace);
1575         if (error)
1576                 return (error);
1577         INP_INFO_WLOCK(pcbinfo);
1578         error = in_pcballoc(so, pcbinfo);
1579         if (error) {
1580                 INP_INFO_WUNLOCK(pcbinfo);
1581                 return (error);
1582         }
1583
1584         inp = sotoinpcb(so);
1585         inp->inp_vflag |= INP_IPV4;
1586         inp->inp_ip_ttl = V_ip_defttl;
1587
1588         error = udp_newudpcb(inp);
1589         if (error) {
1590                 in_pcbdetach(inp);
1591                 in_pcbfree(inp);
1592                 INP_INFO_WUNLOCK(pcbinfo);
1593                 return (error);
1594         }
1595
1596         INP_WUNLOCK(inp);
1597         INP_INFO_WUNLOCK(pcbinfo);
1598         return (0);
1599 }
1600 #endif /* INET */
1601
1602 int
1603 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1604 {
1605         struct inpcb *inp;
1606         struct udpcb *up;
1607
1608         KASSERT(so->so_type == SOCK_DGRAM,
1609             ("udp_set_kernel_tunneling: !dgram"));
1610         inp = sotoinpcb(so);
1611         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1612         INP_WLOCK(inp);
1613         up = intoudpcb(inp);
1614         if ((up->u_tun_func != NULL) ||
1615             (up->u_icmp_func != NULL)) {
1616                 INP_WUNLOCK(inp);
1617                 return (EBUSY);
1618         }
1619         up->u_tun_func = f;
1620         up->u_icmp_func = i;
1621         up->u_tun_ctx = ctx;
1622         INP_WUNLOCK(inp);
1623         return (0);
1624 }
1625
1626 #ifdef INET
1627 static int
1628 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1629 {
1630         struct inpcb *inp;
1631         struct inpcbinfo *pcbinfo;
1632         int error;
1633
1634         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1635         inp = sotoinpcb(so);
1636         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1637         INP_WLOCK(inp);
1638         INP_HASH_WLOCK(pcbinfo);
1639         error = in_pcbbind(inp, nam, td->td_ucred);
1640         INP_HASH_WUNLOCK(pcbinfo);
1641         INP_WUNLOCK(inp);
1642         return (error);
1643 }
1644
1645 static void
1646 udp_close(struct socket *so)
1647 {
1648         struct inpcb *inp;
1649         struct inpcbinfo *pcbinfo;
1650
1651         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1652         inp = sotoinpcb(so);
1653         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1654         INP_WLOCK(inp);
1655         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1656                 INP_HASH_WLOCK(pcbinfo);
1657                 in_pcbdisconnect(inp);
1658                 inp->inp_laddr.s_addr = INADDR_ANY;
1659                 INP_HASH_WUNLOCK(pcbinfo);
1660                 soisdisconnected(so);
1661         }
1662         INP_WUNLOCK(inp);
1663 }
1664
1665 static int
1666 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1667 {
1668         struct inpcb *inp;
1669         struct inpcbinfo *pcbinfo;
1670         struct sockaddr_in *sin;
1671         int error;
1672
1673         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1674         inp = sotoinpcb(so);
1675         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1676         INP_WLOCK(inp);
1677         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1678                 INP_WUNLOCK(inp);
1679                 return (EISCONN);
1680         }
1681         sin = (struct sockaddr_in *)nam;
1682         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1683         if (error != 0) {
1684                 INP_WUNLOCK(inp);
1685                 return (error);
1686         }
1687         INP_HASH_WLOCK(pcbinfo);
1688         error = in_pcbconnect(inp, nam, td->td_ucred);
1689         INP_HASH_WUNLOCK(pcbinfo);
1690         if (error == 0)
1691                 soisconnected(so);
1692         INP_WUNLOCK(inp);
1693         return (error);
1694 }
1695
1696 static void
1697 udp_detach(struct socket *so)
1698 {
1699         struct inpcb *inp;
1700         struct inpcbinfo *pcbinfo;
1701         struct udpcb *up;
1702
1703         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1704         inp = sotoinpcb(so);
1705         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1706         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1707             ("udp_detach: not disconnected"));
1708         INP_INFO_WLOCK(pcbinfo);
1709         INP_WLOCK(inp);
1710         up = intoudpcb(inp);
1711         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1712         inp->inp_ppcb = NULL;
1713         in_pcbdetach(inp);
1714         in_pcbfree(inp);
1715         INP_INFO_WUNLOCK(pcbinfo);
1716         udp_discardcb(up);
1717 }
1718
1719 static int
1720 udp_disconnect(struct socket *so)
1721 {
1722         struct inpcb *inp;
1723         struct inpcbinfo *pcbinfo;
1724
1725         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1726         inp = sotoinpcb(so);
1727         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1728         INP_WLOCK(inp);
1729         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1730                 INP_WUNLOCK(inp);
1731                 return (ENOTCONN);
1732         }
1733         INP_HASH_WLOCK(pcbinfo);
1734         in_pcbdisconnect(inp);
1735         inp->inp_laddr.s_addr = INADDR_ANY;
1736         INP_HASH_WUNLOCK(pcbinfo);
1737         SOCK_LOCK(so);
1738         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1739         SOCK_UNLOCK(so);
1740         INP_WUNLOCK(inp);
1741         return (0);
1742 }
1743
1744 static int
1745 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1746     struct mbuf *control, struct thread *td)
1747 {
1748         struct inpcb *inp;
1749
1750         inp = sotoinpcb(so);
1751         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1752         return (udp_output(inp, m, addr, control, td));
1753 }
1754 #endif /* INET */
1755
1756 int
1757 udp_shutdown(struct socket *so)
1758 {
1759         struct inpcb *inp;
1760
1761         inp = sotoinpcb(so);
1762         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1763         INP_WLOCK(inp);
1764         socantsendmore(so);
1765         INP_WUNLOCK(inp);
1766         return (0);
1767 }
1768
1769 #ifdef INET
1770 struct pr_usrreqs udp_usrreqs = {
1771         .pru_abort =            udp_abort,
1772         .pru_attach =           udp_attach,
1773         .pru_bind =             udp_bind,
1774         .pru_connect =          udp_connect,
1775         .pru_control =          in_control,
1776         .pru_detach =           udp_detach,
1777         .pru_disconnect =       udp_disconnect,
1778         .pru_peeraddr =         in_getpeeraddr,
1779         .pru_send =             udp_send,
1780         .pru_soreceive =        soreceive_dgram,
1781         .pru_sosend =           sosend_dgram,
1782         .pru_shutdown =         udp_shutdown,
1783         .pru_sockaddr =         in_getsockaddr,
1784         .pru_sosetlabel =       in_pcbsosetlabel,
1785         .pru_close =            udp_close,
1786 };
1787 #endif /* INET */