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  * 3. 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 static VNET_DEFINE(int, udp_require_l2_bcast) = 0;
 127 #define V_udp_require_l2_bcast          VNET(udp_require_l2_bcast)
 128 SYSCTL_INT(_net_inet_udp, OID_AUTO, require_l2_bcast, CTLFLAG_VNET | CTLFLAG_RW,
 129     &VNET_NAME(udp_require_l2_bcast), 0,
 130     "Only treat packets sent to an L2 broadcast address as broadcast packets");
 131
 132 u_long  udp_sendspace = 9216;           /* really max datagram size */
 133 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 134     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 135
 136 u_long  udp_recvspace = 40 * (1024 +
 137 #ifdef INET6
 138                                       sizeof(struct sockaddr_in6)
 139 #else
 140                                       sizeof(struct sockaddr_in)
 141 #endif
 142                                       );        /* 40 1K datagrams */
 143
 144 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 145     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 146
 147 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 148 VNET_DEFINE(struct inpcbinfo, udbinfo);
 149 VNET_DEFINE(struct inpcbhead, ulitecb);
 150 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 151 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 152 #define V_udpcb_zone                    VNET(udpcb_zone)
 153
 154 #ifndef UDBHASHSIZE
 155 #define UDBHASHSIZE     128
 156 #endif
 157
 158 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 159 VNET_PCPUSTAT_SYSINIT(udpstat);
 160 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 161     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 162
 163 #ifdef VIMAGE
 164 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 165 #endif /* VIMAGE */
 166 #ifdef INET
 167 static void     udp_detach(struct socket *so);
 168 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 169                     struct mbuf *, struct thread *);
 170 #endif
 171
 172 static void
 173 udp_zone_change(void *tag)
 174 {
 175
 176         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 177         uma_zone_set_max(V_udpcb_zone, maxsockets);
 178 }
 179
 180 static int
 181 udp_inpcb_init(void *mem, int size, int flags)
 182 {
 183         struct inpcb *inp;
 184
 185         inp = mem;
 186         INP_LOCK_INIT(inp, "inp", "udpinp");
 187         return (0);
 188 }
 189
 190 static int
 191 udplite_inpcb_init(void *mem, int size, int flags)
 192 {
 193         struct inpcb *inp;
 194
 195         inp = mem;
 196         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 197         return (0);
 198 }
 199
 200 void
 201 udp_init(void)
 202 {
 203
 204         /*
 205          * For now default to 2-tuple UDP hashing - until the fragment
 206          * reassembly code can also update the flowid.
 207          *
 208          * Once we can calculate the flowid that way and re-establish
 209          * a 4-tuple, flip this to 4-tuple.
 210          */
 211         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 212             "udp_inpcb", udp_inpcb_init, NULL, 0,
 213             IPI_HASHFIELDS_2TUPLE);
 214         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 215             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 216         uma_zone_set_max(V_udpcb_zone, maxsockets);
 217         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 218         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 219             EVENTHANDLER_PRI_ANY);
 220 }
 221
 222 void
 223 udplite_init(void)
 224 {
 225
 226         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 227             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 228             0, IPI_HASHFIELDS_2TUPLE);
 229 }
 230
 231 /*
 232  * Kernel module interface for updating udpstat.  The argument is an index
 233  * into udpstat treated as an array of u_long.  While this encodes the
 234  * general layout of udpstat into the caller, it doesn't encode its location,
 235  * so that future changes to add, for example, per-CPU stats support won't
 236  * cause binary compatibility problems for kernel modules.
 237  */
 238 void
 239 kmod_udpstat_inc(int statnum)
 240 {
 241
 242         counter_u64_add(VNET(udpstat)[statnum], 1);
 243 }
 244
 245 int
 246 udp_newudpcb(struct inpcb *inp)
 247 {
 248         struct udpcb *up;
 249
 250         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 251         if (up == NULL)
 252                 return (ENOBUFS);
 253         inp->inp_ppcb = up;
 254         return (0);
 255 }
 256
 257 void
 258 udp_discardcb(struct udpcb *up)
 259 {
 260
 261         uma_zfree(V_udpcb_zone, up);
 262 }
 263
 264 #ifdef VIMAGE
 265 static void
 266 udp_destroy(void *unused __unused)
 267 {
 268
 269         in_pcbinfo_destroy(&V_udbinfo);
 270         uma_zdestroy(V_udpcb_zone);
 271 }
 272 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 273
 274 static void
 275 udplite_destroy(void *unused __unused)
 276 {
 277
 278         in_pcbinfo_destroy(&V_ulitecbinfo);
 279 }
 280 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 281     NULL);
 282 #endif
 283
 284 #ifdef INET
 285 /*
 286  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 287  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 288  * contains the source address.  If the socket ends up being an IPv6 socket,
 289  * udp_append() will convert to a sockaddr_in6 before passing the address
 290  * into the socket code.
 291  *
 292  * In the normal case udp_append() will return 0, indicating that you
 293  * must unlock the inp. However if a tunneling protocol is in place we increment
 294  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 295  * then decrement the reference count. If the inp_rele returns 1, indicating the
 296  * inp is gone, we return that to the caller to tell them *not* to unlock
 297  * the inp. In the case of multi-cast this will cause the distribution
 298  * to stop (though most tunneling protocols known currently do *not* use
 299  * multicast).
 300  */
 301 static int
 302 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 303     struct sockaddr_in *udp_in)
 304 {
 305         struct sockaddr *append_sa;
 306         struct socket *so;
 307         struct mbuf *opts = NULL;
 308 #ifdef INET6
 309         struct sockaddr_in6 udp_in6;
 310 #endif
 311         struct udpcb *up;
 312
 313         INP_LOCK_ASSERT(inp);
 314
 315         /*
 316          * Engage the tunneling protocol.
 317          */
 318         up = intoudpcb(inp);
 319         if (up->u_tun_func != NULL) {
 320                 in_pcbref(inp);
 321                 INP_RUNLOCK(inp);
 322                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 323                     up->u_tun_ctx);
 324                 INP_RLOCK(inp);
 325                 return (in_pcbrele_rlocked(inp));
 326         }
 327
 328         off += sizeof(struct udphdr);
 329
 330 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 331         /* Check AH/ESP integrity. */
 332         if (IPSEC_ENABLED(ipv4) &&
 333             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 334                 m_freem(n);
 335                 return (0);
 336         }
 337         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 338                 if (IPSEC_ENABLED(ipv4) &&
 339                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 340                         return (0);     /* Consumed. */
 341         }
 342 #endif /* IPSEC */
 343 #ifdef MAC
 344         if (mac_inpcb_check_deliver(inp, n) != 0) {
 345                 m_freem(n);
 346                 return (0);
 347         }
 348 #endif /* MAC */
 349         if (inp->inp_flags & INP_CONTROLOPTS ||
 350             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 351 #ifdef INET6
 352                 if (inp->inp_vflag & INP_IPV6)
 353                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 354                 else
 355 #endif /* INET6 */
 356                         ip_savecontrol(inp, &opts, ip, n);
 357         }
 358 #ifdef INET6
 359         if (inp->inp_vflag & INP_IPV6) {
 360                 bzero(&udp_in6, sizeof(udp_in6));
 361                 udp_in6.sin6_len = sizeof(udp_in6);
 362                 udp_in6.sin6_family = AF_INET6;
 363                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 364                 append_sa = (struct sockaddr *)&udp_in6;
 365         } else
 366 #endif /* INET6 */
 367                 append_sa = (struct sockaddr *)udp_in;
 368         m_adj(n, off);
 369
 370         so = inp->inp_socket;
 371         SOCKBUF_LOCK(&so->so_rcv);
 372         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 373                 SOCKBUF_UNLOCK(&so->so_rcv);
 374                 m_freem(n);
 375                 if (opts)
 376                         m_freem(opts);
 377                 UDPSTAT_INC(udps_fullsock);
 378         } else
 379                 sorwakeup_locked(so);
 380         return (0);
 381 }
 382
 383 int
 384 udp_input(struct mbuf **mp, int *offp, int proto)
 385 {
 386         struct ip *ip;
 387         struct udphdr *uh;
 388         struct ifnet *ifp;
 389         struct inpcb *inp;
 390         uint16_t len, ip_len;
 391         struct inpcbinfo *pcbinfo;
 392         struct ip save_ip;
 393         struct sockaddr_in udp_in;
 394         struct mbuf *m;
 395         struct m_tag *fwd_tag;
 396         int cscov_partial, iphlen;
 397
 398         m = *mp;
 399         iphlen = *offp;
 400         ifp = m->m_pkthdr.rcvif;
 401         *mp = NULL;
 402         UDPSTAT_INC(udps_ipackets);
 403
 404         /*
 405          * Strip IP options, if any; should skip this, make available to
 406          * user, and use on returned packets, but we don't yet have a way to
 407          * check the checksum with options still present.
 408          */
 409         if (iphlen > sizeof (struct ip)) {
 410                 ip_stripoptions(m);
 411                 iphlen = sizeof(struct ip);
 412         }
 413
 414         /*
 415          * Get IP and UDP header together in first mbuf.
 416          */
 417         ip = mtod(m, struct ip *);
 418         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 419                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 420                         UDPSTAT_INC(udps_hdrops);
 421                         return (IPPROTO_DONE);
 422                 }
 423                 ip = mtod(m, struct ip *);
 424         }
 425         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 426         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 427
 428         /*
 429          * Destination port of 0 is illegal, based on RFC768.
 430          */
 431         if (uh->uh_dport == 0)
 432                 goto badunlocked;
 433
 434         /*
 435          * Construct sockaddr format source address.  Stuff source address
 436          * and datagram in user buffer.
 437          */
 438         bzero(&udp_in, sizeof(udp_in));
 439         udp_in.sin_len = sizeof(udp_in);
 440         udp_in.sin_family = AF_INET;
 441         udp_in.sin_port = uh->uh_sport;
 442         udp_in.sin_addr = ip->ip_src;
 443
 444         /*
 445          * Make mbuf data length reflect UDP length.  If not enough data to
 446          * reflect UDP length, drop.
 447          */
 448         len = ntohs((u_short)uh->uh_ulen);
 449         ip_len = ntohs(ip->ip_len) - iphlen;
 450         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 451                 /* Zero means checksum over the complete packet. */
 452                 if (len == 0)
 453                         len = ip_len;
 454                 cscov_partial = 0;
 455         }
 456         if (ip_len != len) {
 457                 if (len > ip_len || len < sizeof(struct udphdr)) {
 458                         UDPSTAT_INC(udps_badlen);
 459                         goto badunlocked;
 460                 }
 461                 if (proto == IPPROTO_UDP)
 462                         m_adj(m, len - ip_len);
 463         }
 464
 465         /*
 466          * Save a copy of the IP header in case we want restore it for
 467          * sending an ICMP error message in response.
 468          */
 469         if (!V_udp_blackhole)
 470                 save_ip = *ip;
 471         else
 472                 memset(&save_ip, 0, sizeof(save_ip));
 473
 474         /*
 475          * Checksum extended UDP header and data.
 476          */
 477         if (uh->uh_sum) {
 478                 u_short uh_sum;
 479
 480                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 481                     !cscov_partial) {
 482                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 483                                 uh_sum = m->m_pkthdr.csum_data;
 484                         else
 485                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 486                                     ip->ip_dst.s_addr, htonl((u_short)len +
 487                                     m->m_pkthdr.csum_data + proto));
 488                         uh_sum ^= 0xffff;
 489                 } else {
 490                         char b[9];
 491
 492                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 493                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 494                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 495                             uh->uh_ulen : htons(ip_len);
 496                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 497                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 498                 }
 499                 if (uh_sum) {
 500                         UDPSTAT_INC(udps_badsum);
 501                         m_freem(m);
 502                         return (IPPROTO_DONE);
 503                 }
 504         } else {
 505                 if (proto == IPPROTO_UDP) {
 506                         UDPSTAT_INC(udps_nosum);
 507                 } else {
 508                         /* UDPLite requires a checksum */
 509                         /* XXX: What is the right UDPLite MIB counter here? */
 510                         m_freem(m);
 511                         return (IPPROTO_DONE);
 512                 }
 513         }
 514
 515         pcbinfo = udp_get_inpcbinfo(proto);
 516         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 517             ((!V_udp_require_l2_bcast || m->m_flags & M_BCAST) &&
 518             in_broadcast(ip->ip_dst, ifp))) {
 519                 struct inpcb *last;
 520                 struct inpcbhead *pcblist;
 521                 struct ip_moptions *imo;
 522
 523                 INP_INFO_RLOCK(pcbinfo);
 524                 pcblist = udp_get_pcblist(proto);
 525                 last = NULL;
 526                 LIST_FOREACH(inp, pcblist, inp_list) {
 527                         if (inp->inp_lport != uh->uh_dport)
 528                                 continue;
 529 #ifdef INET6
 530                         if ((inp->inp_vflag & INP_IPV4) == 0)
 531                                 continue;
 532 #endif
 533                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 534                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 535                                 continue;
 536                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 537                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 538                                 continue;
 539                         if (inp->inp_fport != 0 &&
 540                             inp->inp_fport != uh->uh_sport)
 541                                 continue;
 542
 543                         INP_RLOCK(inp);
 544
 545                         /*
 546                          * XXXRW: Because we weren't holding either the inpcb
 547                          * or the hash lock when we checked for a match
 548                          * before, we should probably recheck now that the
 549                          * inpcb lock is held.
 550                          */
 551
 552                         /*
 553                          * Handle socket delivery policy for any-source
 554                          * and source-specific multicast. [RFC3678]
 555                          */
 556                         imo = inp->inp_moptions;
 557                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 558                                 struct sockaddr_in       group;
 559                                 int                      blocked;
 560                                 if (imo == NULL) {
 561                                         INP_RUNLOCK(inp);
 562                                         continue;
 563                                 }
 564                                 bzero(&group, sizeof(struct sockaddr_in));
 565                                 group.sin_len = sizeof(struct sockaddr_in);
 566                                 group.sin_family = AF_INET;
 567                                 group.sin_addr = ip->ip_dst;
 568
 569                                 blocked = imo_multi_filter(imo, ifp,
 570                                         (struct sockaddr *)&group,
 571                                         (struct sockaddr *)&udp_in);
 572                                 if (blocked != MCAST_PASS) {
 573                                         if (blocked == MCAST_NOTGMEMBER)
 574                                                 IPSTAT_INC(ips_notmember);
 575                                         if (blocked == MCAST_NOTSMEMBER ||
 576                                             blocked == MCAST_MUTED)
 577                                                 UDPSTAT_INC(udps_filtermcast);
 578                                         INP_RUNLOCK(inp);
 579                                         continue;
 580                                 }
 581                         }
 582                         if (last != NULL) {
 583                                 struct mbuf *n;
 584
 585                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 586                                     NULL) {
 587                                         UDP_PROBE(receive, NULL, last, ip,
 588                                             last, uh);
 589                                         if (udp_append(last, ip, n, iphlen,
 590                                                 &udp_in)) {
 591                                                 goto inp_lost;
 592                                         }
 593                                 }
 594                                 INP_RUNLOCK(last);
 595                         }
 596                         last = inp;
 597                         /*
 598                          * Don't look for additional matches if this one does
 599                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 600                          * socket options set.  This heuristic avoids
 601                          * searching through all pcbs in the common case of a
 602                          * non-shared port.  It assumes that an application
 603                          * will never clear these options after setting them.
 604                          */
 605                         if ((last->inp_socket->so_options &
 606                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 607                                 break;
 608                 }
 609
 610                 if (last == NULL) {
 611                         /*
 612                          * No matching pcb found; discard datagram.  (No need
 613                          * to send an ICMP Port Unreachable for a broadcast
 614                          * or multicast datgram.)
 615                          */
 616                         UDPSTAT_INC(udps_noportbcast);
 617                         if (inp)
 618                                 INP_RUNLOCK(inp);
 619                         INP_INFO_RUNLOCK(pcbinfo);
 620                         goto badunlocked;
 621                 }
 622                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 623                 if (udp_append(last, ip, m, iphlen, &udp_in) == 0)
 624                         INP_RUNLOCK(last);
 625         inp_lost:
 626                 INP_INFO_RUNLOCK(pcbinfo);
 627                 return (IPPROTO_DONE);
 628         }
 629
 630         /*
 631          * Locate pcb for datagram.
 632          */
 633
 634         /*
 635          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 636          */
 637         if ((m->m_flags & M_IP_NEXTHOP) &&
 638             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 639                 struct sockaddr_in *next_hop;
 640
 641                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 642
 643                 /*
 644                  * Transparently forwarded. Pretend to be the destination.
 645                  * Already got one like this?
 646                  */
 647                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 648                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 649                 if (!inp) {
 650                         /*
 651                          * It's new.  Try to find the ambushing socket.
 652                          * Because we've rewritten the destination address,
 653                          * any hardware-generated hash is ignored.
 654                          */
 655                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 656                             uh->uh_sport, next_hop->sin_addr,
 657                             next_hop->sin_port ? htons(next_hop->sin_port) :
 658                             uh->uh_dport, INPLOOKUP_WILDCARD |
 659                             INPLOOKUP_RLOCKPCB, ifp);
 660                 }
 661                 /* Remove the tag from the packet. We don't need it anymore. */
 662                 m_tag_delete(m, fwd_tag);
 663                 m->m_flags &= ~M_IP_NEXTHOP;
 664         } else
 665                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 666                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 667                     INPLOOKUP_RLOCKPCB, ifp, m);
 668         if (inp == NULL) {
 669                 if (udp_log_in_vain) {
 670                         char src[INET_ADDRSTRLEN];
 671                         char dst[INET_ADDRSTRLEN];
 672
 673                         log(LOG_INFO,
 674                             "Connection attempt to UDP %s:%d from %s:%d\n",
 675                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 676                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 677                 }
 678                 UDPSTAT_INC(udps_noport);
 679                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 680                         UDPSTAT_INC(udps_noportbcast);
 681                         goto badunlocked;
 682                 }
 683                 if (V_udp_blackhole)
 684                         goto badunlocked;
 685                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 686                         goto badunlocked;
 687                 *ip = save_ip;
 688                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 689                 return (IPPROTO_DONE);
 690         }
 691
 692         /*
 693          * Check the minimum TTL for socket.
 694          */
 695         INP_RLOCK_ASSERT(inp);
 696         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 697                 INP_RUNLOCK(inp);
 698                 m_freem(m);
 699                 return (IPPROTO_DONE);
 700         }
 701         if (cscov_partial) {
 702                 struct udpcb *up;
 703
 704                 up = intoudpcb(inp);
 705                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 706                         INP_RUNLOCK(inp);
 707                         m_freem(m);
 708                         return (IPPROTO_DONE);
 709                 }
 710         }
 711
 712         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 713         if (udp_append(inp, ip, m, iphlen, &udp_in) == 0)
 714                 INP_RUNLOCK(inp);
 715         return (IPPROTO_DONE);
 716
 717 badunlocked:
 718         m_freem(m);
 719         return (IPPROTO_DONE);
 720 }
 721 #endif /* INET */
 722
 723 /*
 724  * Notify a udp user of an asynchronous error; just wake up so that they can
 725  * collect error status.
 726  */
 727 struct inpcb *
 728 udp_notify(struct inpcb *inp, int errno)
 729 {
 730
 731         /*
 732          * While udp_ctlinput() always calls udp_notify() with a read lock
 733          * when invoking it directly, in_pcbnotifyall() currently uses write
 734          * locks due to sharing code with TCP.  For now, accept either a read
 735          * or a write lock, but a read lock is sufficient.
 736          */
 737         INP_LOCK_ASSERT(inp);
 738         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 739              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 740                 RTFREE(inp->inp_route.ro_rt);
 741                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 742         }
 743
 744         inp->inp_socket->so_error = errno;
 745         sorwakeup(inp->inp_socket);
 746         sowwakeup(inp->inp_socket);
 747         return (inp);
 748 }
 749
 750 #ifdef INET
 751 static void
 752 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 753     struct inpcbinfo *pcbinfo)
 754 {
 755         struct ip *ip = vip;
 756         struct udphdr *uh;
 757         struct in_addr faddr;
 758         struct inpcb *inp;
 759
 760         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 761         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 762                 return;
 763
 764         if (PRC_IS_REDIRECT(cmd)) {
 765                 /* signal EHOSTDOWN, as it flushes the cached route */
 766                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 767                 return;
 768         }
 769
 770         /*
 771          * Hostdead is ugly because it goes linearly through all PCBs.
 772          *
 773          * XXX: We never get this from ICMP, otherwise it makes an excellent
 774          * DoS attack on machines with many connections.
 775          */
 776         if (cmd == PRC_HOSTDEAD)
 777                 ip = NULL;
 778         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 779                 return;
 780         if (ip != NULL) {
 781                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 782                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 783                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 784                 if (inp != NULL) {
 785                         INP_RLOCK_ASSERT(inp);
 786                         if (inp->inp_socket != NULL) {
 787                                 udp_notify(inp, inetctlerrmap[cmd]);
 788                         }
 789                         INP_RUNLOCK(inp);
 790                 } else {
 791                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 792                                            ip->ip_src, uh->uh_sport,
 793                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 794                         if (inp != NULL) {
 795                                 struct udpcb *up;
 796
 797                                 up = intoudpcb(inp);
 798                                 if (up->u_icmp_func != NULL) {
 799                                         INP_RUNLOCK(inp);
 800                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
 801                                 } else {
 802                                         INP_RUNLOCK(inp);
 803                                 }
 804                         }
 805                 }
 806         } else
 807                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 808                     udp_notify);
 809 }
 810 void
 811 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 812 {
 813
 814         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 815 }
 816
 817 void
 818 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 819 {
 820
 821         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 822 }
 823 #endif /* INET */
 824
 825 static int
 826 udp_pcblist(SYSCTL_HANDLER_ARGS)
 827 {
 828         int error, i, n;
 829         struct inpcb *inp, **inp_list;
 830         inp_gen_t gencnt;
 831         struct xinpgen xig;
 832
 833         /*
 834          * The process of preparing the PCB list is too time-consuming and
 835          * resource-intensive to repeat twice on every request.
 836          */
 837         if (req->oldptr == 0) {
 838                 n = V_udbinfo.ipi_count;
 839                 n += imax(n / 8, 10);
 840                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 841                 return (0);
 842         }
 843
 844         if (req->newptr != 0)
 845                 return (EPERM);
 846
 847         /*
 848          * OK, now we're committed to doing something.
 849          */
 850         INP_INFO_RLOCK(&V_udbinfo);
 851         gencnt = V_udbinfo.ipi_gencnt;
 852         n = V_udbinfo.ipi_count;
 853         INP_INFO_RUNLOCK(&V_udbinfo);
 854
 855         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 856                 + n * sizeof(struct xinpcb));
 857         if (error != 0)
 858                 return (error);
 859
 860         xig.xig_len = sizeof xig;
 861         xig.xig_count = n;
 862         xig.xig_gen = gencnt;
 863         xig.xig_sogen = so_gencnt;
 864         error = SYSCTL_OUT(req, &xig, sizeof xig);
 865         if (error)
 866                 return (error);
 867
 868         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 869         if (inp_list == NULL)
 870                 return (ENOMEM);
 871
 872         INP_INFO_RLOCK(&V_udbinfo);
 873         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 874              inp = LIST_NEXT(inp, inp_list)) {
 875                 INP_WLOCK(inp);
 876                 if (inp->inp_gencnt <= gencnt &&
 877                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 878                         in_pcbref(inp);
 879                         inp_list[i++] = inp;
 880                 }
 881                 INP_WUNLOCK(inp);
 882         }
 883         INP_INFO_RUNLOCK(&V_udbinfo);
 884         n = i;
 885
 886         error = 0;
 887         for (i = 0; i < n; i++) {
 888                 inp = inp_list[i];
 889                 INP_RLOCK(inp);
 890                 if (inp->inp_gencnt <= gencnt) {
 891                         struct xinpcb xi;
 892
 893                         bzero(&xi, sizeof(xi));
 894                         xi.xi_len = sizeof xi;
 895                         /* XXX should avoid extra copy */
 896                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 897                         if (inp->inp_socket)
 898                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 899                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 900                         INP_RUNLOCK(inp);
 901                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 902                 } else
 903                         INP_RUNLOCK(inp);
 904         }
 905         INP_INFO_WLOCK(&V_udbinfo);
 906         for (i = 0; i < n; i++) {
 907                 inp = inp_list[i];
 908                 INP_RLOCK(inp);
 909                 if (!in_pcbrele_rlocked(inp))
 910                         INP_RUNLOCK(inp);
 911         }
 912         INP_INFO_WUNLOCK(&V_udbinfo);
 913
 914         if (!error) {
 915                 /*
 916                  * Give the user an updated idea of our state.  If the
 917                  * generation differs from what we told her before, she knows
 918                  * that something happened while we were processing this
 919                  * request, and it might be necessary to retry.
 920                  */
 921                 INP_INFO_RLOCK(&V_udbinfo);
 922                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 923                 xig.xig_sogen = so_gencnt;
 924                 xig.xig_count = V_udbinfo.ipi_count;
 925                 INP_INFO_RUNLOCK(&V_udbinfo);
 926                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 927         }
 928         free(inp_list, M_TEMP);
 929         return (error);
 930 }
 931
 932 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 933     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 934     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 935
 936 #ifdef INET
 937 static int
 938 udp_getcred(SYSCTL_HANDLER_ARGS)
 939 {
 940         struct xucred xuc;
 941         struct sockaddr_in addrs[2];
 942         struct inpcb *inp;
 943         int error;
 944
 945         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 946         if (error)
 947                 return (error);
 948         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 949         if (error)
 950                 return (error);
 951         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 952             addrs[0].sin_addr, addrs[0].sin_port,
 953             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 954         if (inp != NULL) {
 955                 INP_RLOCK_ASSERT(inp);
 956                 if (inp->inp_socket == NULL)
 957                         error = ENOENT;
 958                 if (error == 0)
 959                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 960                 if (error == 0)
 961                         cru2x(inp->inp_cred, &xuc);
 962                 INP_RUNLOCK(inp);
 963         } else
 964                 error = ENOENT;
 965         if (error == 0)
 966                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 967         return (error);
 968 }
 969
 970 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 971     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 972     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 973 #endif /* INET */
 974
 975 int
 976 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 977 {
 978         struct inpcb *inp;
 979         struct udpcb *up;
 980         int isudplite, error, optval;
 981
 982         error = 0;
 983         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 984         inp = sotoinpcb(so);
 985         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 986         INP_WLOCK(inp);
 987         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 988 #ifdef INET6
 989                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 990                         INP_WUNLOCK(inp);
 991                         error = ip6_ctloutput(so, sopt);
 992                 }
 993 #endif
 994 #if defined(INET) && defined(INET6)
 995                 else
 996 #endif
 997 #ifdef INET
 998                 {
 999                         INP_WUNLOCK(inp);
1000                         error = ip_ctloutput(so, sopt);
1001                 }
1002 #endif
1003                 return (error);
1004         }
1005
1006         switch (sopt->sopt_dir) {
1007         case SOPT_SET:
1008                 switch (sopt->sopt_name) {
1009 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1010 #ifdef INET
1011                 case UDP_ENCAP:
1012                         if (!IPSEC_ENABLED(ipv4)) {
1013                                 INP_WUNLOCK(inp);
1014                                 return (ENOPROTOOPT);
1015                         }
1016                         error = UDPENCAP_PCBCTL(inp, sopt);
1017                         break;
1018 #endif /* INET */
1019 #endif /* IPSEC */
1020                 case UDPLITE_SEND_CSCOV:
1021                 case UDPLITE_RECV_CSCOV:
1022                         if (!isudplite) {
1023                                 INP_WUNLOCK(inp);
1024                                 error = ENOPROTOOPT;
1025                                 break;
1026                         }
1027                         INP_WUNLOCK(inp);
1028                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1029                             sizeof(optval));
1030                         if (error != 0)
1031                                 break;
1032                         inp = sotoinpcb(so);
1033                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1034                         INP_WLOCK(inp);
1035                         up = intoudpcb(inp);
1036                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1037                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1038                                 INP_WUNLOCK(inp);
1039                                 error = EINVAL;
1040                                 break;
1041                         }
1042                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1043                                 up->u_txcslen = optval;
1044                         else
1045                                 up->u_rxcslen = optval;
1046                         INP_WUNLOCK(inp);
1047                         break;
1048                 default:
1049                         INP_WUNLOCK(inp);
1050                         error = ENOPROTOOPT;
1051                         break;
1052                 }
1053                 break;
1054         case SOPT_GET:
1055                 switch (sopt->sopt_name) {
1056 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1057 #ifdef INET
1058                 case UDP_ENCAP:
1059                         if (!IPSEC_ENABLED(ipv4)) {
1060                                 INP_WUNLOCK(inp);
1061                                 return (ENOPROTOOPT);
1062                         }
1063                         error = UDPENCAP_PCBCTL(inp, sopt);
1064                         break;
1065 #endif /* INET */
1066 #endif /* IPSEC */
1067                 case UDPLITE_SEND_CSCOV:
1068                 case UDPLITE_RECV_CSCOV:
1069                         if (!isudplite) {
1070                                 INP_WUNLOCK(inp);
1071                                 error = ENOPROTOOPT;
1072                                 break;
1073                         }
1074                         up = intoudpcb(inp);
1075                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1076                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1077                                 optval = up->u_txcslen;
1078                         else
1079                                 optval = up->u_rxcslen;
1080                         INP_WUNLOCK(inp);
1081                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1082                         break;
1083                 default:
1084                         INP_WUNLOCK(inp);
1085                         error = ENOPROTOOPT;
1086                         break;
1087                 }
1088                 break;
1089         }
1090         return (error);
1091 }
1092
1093 #ifdef INET
1094 #define UH_WLOCKED      2
1095 #define UH_RLOCKED      1
1096 #define UH_UNLOCKED     0
1097 static int
1098 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1099     struct mbuf *control, struct thread *td)
1100 {
1101         struct udpiphdr *ui;
1102         int len = m->m_pkthdr.len;
1103         struct in_addr faddr, laddr;
1104         struct cmsghdr *cm;
1105         struct inpcbinfo *pcbinfo;
1106         struct sockaddr_in *sin, src;
1107         int cscov_partial = 0;
1108         int error = 0;
1109         int ipflags;
1110         u_short fport, lport;
1111         int unlock_udbinfo, unlock_inp;
1112         u_char tos;
1113         uint8_t pr;
1114         uint16_t cscov = 0;
1115         uint32_t flowid = 0;
1116         uint8_t flowtype = M_HASHTYPE_NONE;
1117
1118         /*
1119          * udp_output() may need to temporarily bind or connect the current
1120          * inpcb.  As such, we don't know up front whether we will need the
1121          * pcbinfo lock or not.  Do any work to decide what is needed up
1122          * front before acquiring any locks.
1123          */
1124         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1125                 if (control)
1126                         m_freem(control);
1127                 m_freem(m);
1128                 return (EMSGSIZE);
1129         }
1130
1131         src.sin_family = 0;
1132         sin = (struct sockaddr_in *)addr;
1133         if (sin == NULL ||
1134             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1135                 INP_WLOCK(inp);
1136                 unlock_inp = UH_WLOCKED;
1137         } else {
1138                 INP_RLOCK(inp);
1139                 unlock_inp = UH_RLOCKED;
1140         }
1141         tos = inp->inp_ip_tos;
1142         if (control != NULL) {
1143                 /*
1144                  * XXX: Currently, we assume all the optional information is
1145                  * stored in a single mbuf.
1146                  */
1147                 if (control->m_next) {
1148                         if (unlock_inp == UH_WLOCKED)
1149                                 INP_WUNLOCK(inp);
1150                         else
1151                                 INP_RUNLOCK(inp);
1152                         m_freem(control);
1153                         m_freem(m);
1154                         return (EINVAL);
1155                 }
1156                 for (; control->m_len > 0;
1157                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1158                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1159                         cm = mtod(control, struct cmsghdr *);
1160                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1161                             || cm->cmsg_len > control->m_len) {
1162                                 error = EINVAL;
1163                                 break;
1164                         }
1165                         if (cm->cmsg_level != IPPROTO_IP)
1166                                 continue;
1167
1168                         switch (cm->cmsg_type) {
1169                         case IP_SENDSRCADDR:
1170                                 if (cm->cmsg_len !=
1171                                     CMSG_LEN(sizeof(struct in_addr))) {
1172                                         error = EINVAL;
1173                                         break;
1174                                 }
1175                                 bzero(&src, sizeof(src));
1176                                 src.sin_family = AF_INET;
1177                                 src.sin_len = sizeof(src);
1178                                 src.sin_port = inp->inp_lport;
1179                                 src.sin_addr =
1180                                     *(struct in_addr *)CMSG_DATA(cm);
1181                                 break;
1182
1183                         case IP_TOS:
1184                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1185                                         error = EINVAL;
1186                                         break;
1187                                 }
1188                                 tos = *(u_char *)CMSG_DATA(cm);
1189                                 break;
1190
1191                         case IP_FLOWID:
1192                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1193                                         error = EINVAL;
1194                                         break;
1195                                 }
1196                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1197                                 break;
1198
1199                         case IP_FLOWTYPE:
1200                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1201                                         error = EINVAL;
1202                                         break;
1203                                 }
1204                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1205                                 break;
1206
1207 #ifdef  RSS
1208                         case IP_RSSBUCKETID:
1209                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1210                                         error = EINVAL;
1211                                         break;
1212                                 }
1213                                 /* This is just a placeholder for now */
1214                                 break;
1215 #endif  /* RSS */
1216                         default:
1217                                 error = ENOPROTOOPT;
1218                                 break;
1219                         }
1220                         if (error)
1221                                 break;
1222                 }
1223                 m_freem(control);
1224         }
1225         if (error) {
1226                 if (unlock_inp == UH_WLOCKED)
1227                         INP_WUNLOCK(inp);
1228                 else
1229                         INP_RUNLOCK(inp);
1230                 m_freem(m);
1231                 return (error);
1232         }
1233
1234         /*
1235          * Depending on whether or not the application has bound or connected
1236          * the socket, we may have to do varying levels of work.  The optimal
1237          * case is for a connected UDP socket, as a global lock isn't
1238          * required at all.
1239          *
1240          * In order to decide which we need, we require stability of the
1241          * inpcb binding, which we ensure by acquiring a read lock on the
1242          * inpcb.  This doesn't strictly follow the lock order, so we play
1243          * the trylock and retry game; note that we may end up with more
1244          * conservative locks than required the second time around, so later
1245          * assertions have to accept that.  Further analysis of the number of
1246          * misses under contention is required.
1247          *
1248          * XXXRW: Check that hash locking update here is correct.
1249          */
1250         pr = inp->inp_socket->so_proto->pr_protocol;
1251         pcbinfo = udp_get_inpcbinfo(pr);
1252         sin = (struct sockaddr_in *)addr;
1253         if (sin != NULL &&
1254             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1255                 INP_HASH_WLOCK(pcbinfo);
1256                 unlock_udbinfo = UH_WLOCKED;
1257         } else if ((sin != NULL && (
1258             (sin->sin_addr.s_addr == INADDR_ANY) ||
1259             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1260             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1261             (inp->inp_lport == 0))) ||
1262             (src.sin_family == AF_INET)) {
1263                 INP_HASH_RLOCK(pcbinfo);
1264                 unlock_udbinfo = UH_RLOCKED;
1265         } else
1266                 unlock_udbinfo = UH_UNLOCKED;
1267
1268         /*
1269          * If the IP_SENDSRCADDR control message was specified, override the
1270          * source address for this datagram.  Its use is invalidated if the
1271          * address thus specified is incomplete or clobbers other inpcbs.
1272          */
1273         laddr = inp->inp_laddr;
1274         lport = inp->inp_lport;
1275         if (src.sin_family == AF_INET) {
1276                 INP_HASH_LOCK_ASSERT(pcbinfo);
1277                 if ((lport == 0) ||
1278                     (laddr.s_addr == INADDR_ANY &&
1279                      src.sin_addr.s_addr == INADDR_ANY)) {
1280                         error = EINVAL;
1281                         goto release;
1282                 }
1283                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1284                     &laddr.s_addr, &lport, td->td_ucred);
1285                 if (error)
1286                         goto release;
1287         }
1288
1289         /*
1290          * If a UDP socket has been connected, then a local address/port will
1291          * have been selected and bound.
1292          *
1293          * If a UDP socket has not been connected to, then an explicit
1294          * destination address must be used, in which case a local
1295          * address/port may not have been selected and bound.
1296          */
1297         if (sin != NULL) {
1298                 INP_LOCK_ASSERT(inp);
1299                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1300                         error = EISCONN;
1301                         goto release;
1302                 }
1303
1304                 /*
1305                  * Jail may rewrite the destination address, so let it do
1306                  * that before we use it.
1307                  */
1308                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1309                 if (error)
1310                         goto release;
1311
1312                 /*
1313                  * If a local address or port hasn't yet been selected, or if
1314                  * the destination address needs to be rewritten due to using
1315                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1316                  * to do the heavy lifting.  Once a port is selected, we
1317                  * commit the binding back to the socket; we also commit the
1318                  * binding of the address if in jail.
1319                  *
1320                  * If we already have a valid binding and we're not
1321                  * requesting a destination address rewrite, use a fast path.
1322                  */
1323                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1324                     inp->inp_lport == 0 ||
1325                     sin->sin_addr.s_addr == INADDR_ANY ||
1326                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1327                         INP_HASH_LOCK_ASSERT(pcbinfo);
1328                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1329                             &lport, &faddr.s_addr, &fport, NULL,
1330                             td->td_ucred);
1331                         if (error)
1332                                 goto release;
1333
1334                         /*
1335                          * XXXRW: Why not commit the port if the address is
1336                          * !INADDR_ANY?
1337                          */
1338                         /* Commit the local port if newly assigned. */
1339                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1340                             inp->inp_lport == 0) {
1341                                 INP_WLOCK_ASSERT(inp);
1342                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1343                                 /*
1344                                  * Remember addr if jailed, to prevent
1345                                  * rebinding.
1346                                  */
1347                                 if (prison_flag(td->td_ucred, PR_IP4))
1348                                         inp->inp_laddr = laddr;
1349                                 inp->inp_lport = lport;
1350                                 if (in_pcbinshash(inp) != 0) {
1351                                         inp->inp_lport = 0;
1352                                         error = EAGAIN;
1353                                         goto release;
1354                                 }
1355                                 inp->inp_flags |= INP_ANONPORT;
1356                         }
1357                 } else {
1358                         faddr = sin->sin_addr;
1359                         fport = sin->sin_port;
1360                 }
1361         } else {
1362                 INP_LOCK_ASSERT(inp);
1363                 faddr = inp->inp_faddr;
1364                 fport = inp->inp_fport;
1365                 if (faddr.s_addr == INADDR_ANY) {
1366                         error = ENOTCONN;
1367                         goto release;
1368                 }
1369         }
1370
1371         /*
1372          * Calculate data length and get a mbuf for UDP, IP, and possible
1373          * link-layer headers.  Immediate slide the data pointer back forward
1374          * since we won't use that space at this layer.
1375          */
1376         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1377         if (m == NULL) {
1378                 error = ENOBUFS;
1379                 goto release;
1380         }
1381         m->m_data += max_linkhdr;
1382         m->m_len -= max_linkhdr;
1383         m->m_pkthdr.len -= max_linkhdr;
1384
1385         /*
1386          * Fill in mbuf with extended UDP header and addresses and length put
1387          * into network format.
1388          */
1389         ui = mtod(m, struct udpiphdr *);
1390         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1391         ui->ui_pr = pr;
1392         ui->ui_src = laddr;
1393         ui->ui_dst = faddr;
1394         ui->ui_sport = lport;
1395         ui->ui_dport = fport;
1396         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1397         if (pr == IPPROTO_UDPLITE) {
1398                 struct udpcb *up;
1399                 uint16_t plen;
1400
1401                 up = intoudpcb(inp);
1402                 cscov = up->u_txcslen;
1403                 plen = (u_short)len + sizeof(struct udphdr);
1404                 if (cscov >= plen)
1405                         cscov = 0;
1406                 ui->ui_len = htons(plen);
1407                 ui->ui_ulen = htons(cscov);
1408                 /*
1409                  * For UDP-Lite, checksum coverage length of zero means
1410                  * the entire UDPLite packet is covered by the checksum.
1411                  */
1412                 cscov_partial = (cscov == 0) ? 0 : 1;
1413         } else
1414                 ui->ui_v = IPVERSION << 4;
1415
1416         /*
1417          * Set the Don't Fragment bit in the IP header.
1418          */
1419         if (inp->inp_flags & INP_DONTFRAG) {
1420                 struct ip *ip;
1421
1422                 ip = (struct ip *)&ui->ui_i;
1423                 ip->ip_off |= htons(IP_DF);
1424         }
1425
1426         ipflags = 0;
1427         if (inp->inp_socket->so_options & SO_DONTROUTE)
1428                 ipflags |= IP_ROUTETOIF;
1429         if (inp->inp_socket->so_options & SO_BROADCAST)
1430                 ipflags |= IP_ALLOWBROADCAST;
1431         if (inp->inp_flags & INP_ONESBCAST)
1432                 ipflags |= IP_SENDONES;
1433
1434 #ifdef MAC
1435         mac_inpcb_create_mbuf(inp, m);
1436 #endif
1437
1438         /*
1439          * Set up checksum and output datagram.
1440          */
1441         ui->ui_sum = 0;
1442         if (pr == IPPROTO_UDPLITE) {
1443                 if (inp->inp_flags & INP_ONESBCAST)
1444                         faddr.s_addr = INADDR_BROADCAST;
1445                 if (cscov_partial) {
1446                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1447                                 ui->ui_sum = 0xffff;
1448                 } else {
1449                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1450                                 ui->ui_sum = 0xffff;
1451                 }
1452         } else if (V_udp_cksum) {
1453                 if (inp->inp_flags & INP_ONESBCAST)
1454                         faddr.s_addr = INADDR_BROADCAST;
1455                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1456                     htons((u_short)len + sizeof(struct udphdr) + pr));
1457                 m->m_pkthdr.csum_flags = CSUM_UDP;
1458                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1459         }
1460         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1461         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1462         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1463         UDPSTAT_INC(udps_opackets);
1464
1465         /*
1466          * Setup flowid / RSS information for outbound socket.
1467          *
1468          * Once the UDP code decides to set a flowid some other way,
1469          * this allows the flowid to be overridden by userland.
1470          */
1471         if (flowtype != M_HASHTYPE_NONE) {
1472                 m->m_pkthdr.flowid = flowid;
1473                 M_HASHTYPE_SET(m, flowtype);
1474 #ifdef  RSS
1475         } else {
1476                 uint32_t hash_val, hash_type;
1477                 /*
1478                  * Calculate an appropriate RSS hash for UDP and
1479                  * UDP Lite.
1480                  *
1481                  * The called function will take care of figuring out
1482                  * whether a 2-tuple or 4-tuple hash is required based
1483                  * on the currently configured scheme.
1484                  *
1485                  * Later later on connected socket values should be
1486                  * cached in the inpcb and reused, rather than constantly
1487                  * re-calculating it.
1488                  *
1489                  * UDP Lite is a different protocol number and will
1490                  * likely end up being hashed as a 2-tuple until
1491                  * RSS / NICs grow UDP Lite protocol awareness.
1492                  */
1493                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1494                     pr, &hash_val, &hash_type) == 0) {
1495                         m->m_pkthdr.flowid = hash_val;
1496                         M_HASHTYPE_SET(m, hash_type);
1497                 }
1498 #endif
1499         }
1500
1501 #ifdef  RSS
1502         /*
1503          * Don't override with the inp cached flowid value.
1504          *
1505          * Depending upon the kind of send being done, the inp
1506          * flowid/flowtype values may actually not be appropriate
1507          * for this particular socket send.
1508          *
1509          * We should either leave the flowid at zero (which is what is
1510          * currently done) or set it to some software generated
1511          * hash value based on the packet contents.
1512          */
1513         ipflags |= IP_NODEFAULTFLOWID;
1514 #endif  /* RSS */
1515
1516         if (unlock_udbinfo == UH_WLOCKED)
1517                 INP_HASH_WUNLOCK(pcbinfo);
1518         else if (unlock_udbinfo == UH_RLOCKED)
1519                 INP_HASH_RUNLOCK(pcbinfo);
1520         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1521         error = ip_output(m, inp->inp_options,
1522             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1523             inp->inp_moptions, inp);
1524         if (unlock_inp == UH_WLOCKED)
1525                 INP_WUNLOCK(inp);
1526         else
1527                 INP_RUNLOCK(inp);
1528         return (error);
1529
1530 release:
1531         if (unlock_udbinfo == UH_WLOCKED) {
1532                 KASSERT(unlock_inp == UH_WLOCKED,
1533                     ("%s: excl udbinfo lock, shared inp lock", __func__));
1534                 INP_HASH_WUNLOCK(pcbinfo);
1535                 INP_WUNLOCK(inp);
1536         } else if (unlock_udbinfo == UH_RLOCKED) {
1537                 KASSERT(unlock_inp == UH_RLOCKED,
1538                     ("%s: shared udbinfo lock, excl inp lock", __func__));
1539                 INP_HASH_RUNLOCK(pcbinfo);
1540                 INP_RUNLOCK(inp);
1541         } else if (unlock_inp == UH_WLOCKED)
1542                 INP_WUNLOCK(inp);
1543         else
1544                 INP_RUNLOCK(inp);
1545         m_freem(m);
1546         return (error);
1547 }
1548
1549 static void
1550 udp_abort(struct socket *so)
1551 {
1552         struct inpcb *inp;
1553         struct inpcbinfo *pcbinfo;
1554
1555         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1556         inp = sotoinpcb(so);
1557         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1558         INP_WLOCK(inp);
1559         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1560                 INP_HASH_WLOCK(pcbinfo);
1561                 in_pcbdisconnect(inp);
1562                 inp->inp_laddr.s_addr = INADDR_ANY;
1563                 INP_HASH_WUNLOCK(pcbinfo);
1564                 soisdisconnected(so);
1565         }
1566         INP_WUNLOCK(inp);
1567 }
1568
1569 static int
1570 udp_attach(struct socket *so, int proto, struct thread *td)
1571 {
1572         struct inpcb *inp;
1573         struct inpcbinfo *pcbinfo;
1574         int error;
1575
1576         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1577         inp = sotoinpcb(so);
1578         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1579         error = soreserve(so, udp_sendspace, udp_recvspace);
1580         if (error)
1581                 return (error);
1582         INP_INFO_WLOCK(pcbinfo);
1583         error = in_pcballoc(so, pcbinfo);
1584         if (error) {
1585                 INP_INFO_WUNLOCK(pcbinfo);
1586                 return (error);
1587         }
1588
1589         inp = sotoinpcb(so);
1590         inp->inp_vflag |= INP_IPV4;
1591         inp->inp_ip_ttl = V_ip_defttl;
1592
1593         error = udp_newudpcb(inp);
1594         if (error) {
1595                 in_pcbdetach(inp);
1596                 in_pcbfree(inp);
1597                 INP_INFO_WUNLOCK(pcbinfo);
1598                 return (error);
1599         }
1600
1601         INP_WUNLOCK(inp);
1602         INP_INFO_WUNLOCK(pcbinfo);
1603         return (0);
1604 }
1605 #endif /* INET */
1606
1607 int
1608 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1609 {
1610         struct inpcb *inp;
1611         struct udpcb *up;
1612
1613         KASSERT(so->so_type == SOCK_DGRAM,
1614             ("udp_set_kernel_tunneling: !dgram"));
1615         inp = sotoinpcb(so);
1616         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1617         INP_WLOCK(inp);
1618         up = intoudpcb(inp);
1619         if ((up->u_tun_func != NULL) ||
1620             (up->u_icmp_func != NULL)) {
1621                 INP_WUNLOCK(inp);
1622                 return (EBUSY);
1623         }
1624         up->u_tun_func = f;
1625         up->u_icmp_func = i;
1626         up->u_tun_ctx = ctx;
1627         INP_WUNLOCK(inp);
1628         return (0);
1629 }
1630
1631 #ifdef INET
1632 static int
1633 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1634 {
1635         struct inpcb *inp;
1636         struct inpcbinfo *pcbinfo;
1637         int error;
1638
1639         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1640         inp = sotoinpcb(so);
1641         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1642         INP_WLOCK(inp);
1643         INP_HASH_WLOCK(pcbinfo);
1644         error = in_pcbbind(inp, nam, td->td_ucred);
1645         INP_HASH_WUNLOCK(pcbinfo);
1646         INP_WUNLOCK(inp);
1647         return (error);
1648 }
1649
1650 static void
1651 udp_close(struct socket *so)
1652 {
1653         struct inpcb *inp;
1654         struct inpcbinfo *pcbinfo;
1655
1656         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1657         inp = sotoinpcb(so);
1658         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1659         INP_WLOCK(inp);
1660         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1661                 INP_HASH_WLOCK(pcbinfo);
1662                 in_pcbdisconnect(inp);
1663                 inp->inp_laddr.s_addr = INADDR_ANY;
1664                 INP_HASH_WUNLOCK(pcbinfo);
1665                 soisdisconnected(so);
1666         }
1667         INP_WUNLOCK(inp);
1668 }
1669
1670 static int
1671 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1672 {
1673         struct inpcb *inp;
1674         struct inpcbinfo *pcbinfo;
1675         struct sockaddr_in *sin;
1676         int error;
1677
1678         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1679         inp = sotoinpcb(so);
1680         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1681         INP_WLOCK(inp);
1682         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1683                 INP_WUNLOCK(inp);
1684                 return (EISCONN);
1685         }
1686         sin = (struct sockaddr_in *)nam;
1687         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1688         if (error != 0) {
1689                 INP_WUNLOCK(inp);
1690                 return (error);
1691         }
1692         INP_HASH_WLOCK(pcbinfo);
1693         error = in_pcbconnect(inp, nam, td->td_ucred);
1694         INP_HASH_WUNLOCK(pcbinfo);
1695         if (error == 0)
1696                 soisconnected(so);
1697         INP_WUNLOCK(inp);
1698         return (error);
1699 }
1700
1701 static void
1702 udp_detach(struct socket *so)
1703 {
1704         struct inpcb *inp;
1705         struct inpcbinfo *pcbinfo;
1706         struct udpcb *up;
1707
1708         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1709         inp = sotoinpcb(so);
1710         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1711         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1712             ("udp_detach: not disconnected"));
1713         INP_INFO_WLOCK(pcbinfo);
1714         INP_WLOCK(inp);
1715         up = intoudpcb(inp);
1716         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1717         inp->inp_ppcb = NULL;
1718         in_pcbdetach(inp);
1719         in_pcbfree(inp);
1720         INP_INFO_WUNLOCK(pcbinfo);
1721         udp_discardcb(up);
1722 }
1723
1724 static int
1725 udp_disconnect(struct socket *so)
1726 {
1727         struct inpcb *inp;
1728         struct inpcbinfo *pcbinfo;
1729
1730         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1731         inp = sotoinpcb(so);
1732         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1733         INP_WLOCK(inp);
1734         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1735                 INP_WUNLOCK(inp);
1736                 return (ENOTCONN);
1737         }
1738         INP_HASH_WLOCK(pcbinfo);
1739         in_pcbdisconnect(inp);
1740         inp->inp_laddr.s_addr = INADDR_ANY;
1741         INP_HASH_WUNLOCK(pcbinfo);
1742         SOCK_LOCK(so);
1743         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1744         SOCK_UNLOCK(so);
1745         INP_WUNLOCK(inp);
1746         return (0);
1747 }
1748
1749 static int
1750 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1751     struct mbuf *control, struct thread *td)
1752 {
1753         struct inpcb *inp;
1754
1755         inp = sotoinpcb(so);
1756         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1757         return (udp_output(inp, m, addr, control, td));
1758 }
1759 #endif /* INET */
1760
1761 int
1762 udp_shutdown(struct socket *so)
1763 {
1764         struct inpcb *inp;
1765
1766         inp = sotoinpcb(so);
1767         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1768         INP_WLOCK(inp);
1769         socantsendmore(so);
1770         INP_WUNLOCK(inp);
1771         return (0);
1772 }
1773
1774 #ifdef INET
1775 struct pr_usrreqs udp_usrreqs = {
1776         .pru_abort =            udp_abort,
1777         .pru_attach =           udp_attach,
1778         .pru_bind =             udp_bind,
1779         .pru_connect =          udp_connect,
1780         .pru_control =          in_control,
1781         .pru_detach =           udp_detach,
1782         .pru_disconnect =       udp_disconnect,
1783         .pru_peeraddr =         in_getpeeraddr,
1784         .pru_send =             udp_send,
1785         .pru_soreceive =        soreceive_dgram,
1786         .pru_sosend =           sosend_dgram,
1787         .pru_shutdown =         udp_shutdown,
1788         .pru_sockaddr =         in_getsockaddr,
1789         .pru_sosetlabel =       in_pcbsosetlabel,
1790         .pru_close =            udp_close,
1791 };
1792 #endif /* INET */