sys/netinet/udp_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2008 Robert N. M. Watson
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * Copyright (c) 2014 Kevin Lo
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed by Robert N. M. Watson under
  10  * contract to Juniper Networks, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include "opt_ipfw.h"
  43 #include "opt_inet.h"
  44 #include "opt_inet6.h"
  45 #include "opt_ipsec.h"
  46 #include "opt_rss.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/domain.h>
  50 #include <sys/eventhandler.h>
  51 #include <sys/jail.h>
  52 #include <sys/kernel.h>
  53 #include <sys/lock.h>
  54 #include <sys/malloc.h>
  55 #include <sys/mbuf.h>
  56 #include <sys/priv.h>
  57 #include <sys/proc.h>
  58 #include <sys/protosw.h>
  59 #include <sys/sdt.h>
  60 #include <sys/signalvar.h>
  61 #include <sys/socket.h>
  62 #include <sys/socketvar.h>
  63 #include <sys/sx.h>
  64 #include <sys/sysctl.h>
  65 #include <sys/syslog.h>
  66 #include <sys/systm.h>
  67
  68 #include <vm/uma.h>
  69
  70 #include <net/if.h>
  71 #include <net/if_var.h>
  72 #include <net/route.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 #ifdef IPSEC
  96 #include <netipsec/ipsec.h>
  97 #include <netipsec/esp.h>
  98 #endif
  99
 100 #include <machine/in_cksum.h>
 101
 102 #include <security/mac/mac_framework.h>
 103
 104 /*
 105  * UDP and UDP-Lite protocols implementation.
 106  * Per RFC 768, August, 1980.
 107  * Per RFC 3828, July, 2004.
 108  */
 109
 110 /*
 111  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 112  * removes the only data integrity mechanism for packets and malformed
 113  * packets that would otherwise be discarded due to bad checksums, and may
 114  * cause problems (especially for NFS data blocks).
 115  */
 116 VNET_DEFINE(int, udp_cksum) = 1;
 117 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 118     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 119
 120 int     udp_log_in_vain = 0;
 121 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 122     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 123
 124 VNET_DEFINE(int, udp_blackhole) = 0;
 125 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 126     &VNET_NAME(udp_blackhole), 0,
 127     "Do not send port unreachables for refused connects");
 128
 129 u_long  udp_sendspace = 9216;           /* really max datagram size */
 130                                         /* 40 1K datagrams */
 131 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 132     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 133
 134 u_long  udp_recvspace = 40 * (1024 +
 135 #ifdef INET6
 136                                       sizeof(struct sockaddr_in6)
 137 #else
 138                                       sizeof(struct sockaddr_in)
 139 #endif
 140                                       );
 141
 142 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 143     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 144
 145 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 146 VNET_DEFINE(struct inpcbinfo, udbinfo);
 147 VNET_DEFINE(struct inpcbhead, ulitecb);
 148 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 149 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 150 #define V_udpcb_zone                    VNET(udpcb_zone)
 151
 152 #ifndef UDBHASHSIZE
 153 #define UDBHASHSIZE     128
 154 #endif
 155
 156 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 157 VNET_PCPUSTAT_SYSINIT(udpstat);
 158 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 159     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 160
 161 #ifdef VIMAGE
 162 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 163 #endif /* VIMAGE */
 164 #ifdef INET
 165 static void     udp_detach(struct socket *so);
 166 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 167                     struct mbuf *, struct thread *);
 168 #endif
 169
 170 #ifdef IPSEC
 171 #ifdef IPSEC_NAT_T
 172 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
 173 #ifdef INET
 174 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
 175 #endif
 176 #endif /* IPSEC_NAT_T */
 177 #endif /* IPSEC */
 178
 179 static void
 180 udp_zone_change(void *tag)
 181 {
 182
 183         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 184         uma_zone_set_max(V_udpcb_zone, maxsockets);
 185 }
 186
 187 static int
 188 udp_inpcb_init(void *mem, int size, int flags)
 189 {
 190         struct inpcb *inp;
 191
 192         inp = mem;
 193         INP_LOCK_INIT(inp, "inp", "udpinp");
 194         return (0);
 195 }
 196
 197 static int
 198 udplite_inpcb_init(void *mem, int size, int flags)
 199 {
 200         struct inpcb *inp;
 201
 202         inp = mem;
 203         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 204         return (0);
 205 }
 206
 207 void
 208 udp_init(void)
 209 {
 210
 211         /*
 212          * For now default to 2-tuple UDP hashing - until the fragment
 213          * reassembly code can also update the flowid.
 214          *
 215          * Once we can calculate the flowid that way and re-establish
 216          * a 4-tuple, flip this to 4-tuple.
 217          */
 218         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 219             "udp_inpcb", udp_inpcb_init, NULL, 0,
 220             IPI_HASHFIELDS_2TUPLE);
 221         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 222             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 223         uma_zone_set_max(V_udpcb_zone, maxsockets);
 224         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 225         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 226             EVENTHANDLER_PRI_ANY);
 227 }
 228
 229 void
 230 udplite_init(void)
 231 {
 232
 233         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 234             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 235             0, IPI_HASHFIELDS_2TUPLE);
 236 }
 237
 238 /*
 239  * Kernel module interface for updating udpstat.  The argument is an index
 240  * into udpstat treated as an array of u_long.  While this encodes the
 241  * general layout of udpstat into the caller, it doesn't encode its location,
 242  * so that future changes to add, for example, per-CPU stats support won't
 243  * cause binary compatibility problems for kernel modules.
 244  */
 245 void
 246 kmod_udpstat_inc(int statnum)
 247 {
 248
 249         counter_u64_add(VNET(udpstat)[statnum], 1);
 250 }
 251
 252 int
 253 udp_newudpcb(struct inpcb *inp)
 254 {
 255         struct udpcb *up;
 256
 257         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 258         if (up == NULL)
 259                 return (ENOBUFS);
 260         inp->inp_ppcb = up;
 261         return (0);
 262 }
 263
 264 void
 265 udp_discardcb(struct udpcb *up)
 266 {
 267
 268         uma_zfree(V_udpcb_zone, up);
 269 }
 270
 271 #ifdef VIMAGE
 272 void
 273 udp_destroy(void)
 274 {
 275
 276         in_pcbinfo_destroy(&V_udbinfo);
 277         uma_zdestroy(V_udpcb_zone);
 278 }
 279
 280 void
 281 udplite_destroy(void)
 282 {
 283
 284         in_pcbinfo_destroy(&V_ulitecbinfo);
 285 }
 286 #endif
 287
 288 #ifdef INET
 289 /*
 290  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 291  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 292  * contains the source address.  If the socket ends up being an IPv6 socket,
 293  * udp_append() will convert to a sockaddr_in6 before passing the address
 294  * into the socket code.
 295  */
 296 static void
 297 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 298     struct sockaddr_in *udp_in)
 299 {
 300         struct sockaddr *append_sa;
 301         struct socket *so;
 302         struct mbuf *opts = 0;
 303 #ifdef INET6
 304         struct sockaddr_in6 udp_in6;
 305 #endif
 306         struct udpcb *up;
 307
 308         INP_LOCK_ASSERT(inp);
 309
 310         /*
 311          * Engage the tunneling protocol.
 312          */
 313         up = intoudpcb(inp);
 314         if (up->u_tun_func != NULL) {
 315                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 316                     up->u_tun_ctx);
 317                 return;
 318         }
 319
 320         off += sizeof(struct udphdr);
 321
 322 #ifdef IPSEC
 323         /* Check AH/ESP integrity. */
 324         if (ipsec4_in_reject(n, inp)) {
 325                 m_freem(n);
 326                 return;
 327         }
 328 #ifdef IPSEC_NAT_T
 329         up = intoudpcb(inp);
 330         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 331         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 332                 n = udp4_espdecap(inp, n, off);
 333                 if (n == NULL)                          /* Consumed. */
 334                         return;
 335         }
 336 #endif /* IPSEC_NAT_T */
 337 #endif /* IPSEC */
 338 #ifdef MAC
 339         if (mac_inpcb_check_deliver(inp, n) != 0) {
 340                 m_freem(n);
 341                 return;
 342         }
 343 #endif /* MAC */
 344         if (inp->inp_flags & INP_CONTROLOPTS ||
 345             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 346 #ifdef INET6
 347                 if (inp->inp_vflag & INP_IPV6)
 348                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 349                 else
 350 #endif /* INET6 */
 351                         ip_savecontrol(inp, &opts, ip, n);
 352         }
 353 #ifdef INET6
 354         if (inp->inp_vflag & INP_IPV6) {
 355                 bzero(&udp_in6, sizeof(udp_in6));
 356                 udp_in6.sin6_len = sizeof(udp_in6);
 357                 udp_in6.sin6_family = AF_INET6;
 358                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 359                 append_sa = (struct sockaddr *)&udp_in6;
 360         } else
 361 #endif /* INET6 */
 362                 append_sa = (struct sockaddr *)udp_in;
 363         m_adj(n, off);
 364
 365         so = inp->inp_socket;
 366         SOCKBUF_LOCK(&so->so_rcv);
 367         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 368                 SOCKBUF_UNLOCK(&so->so_rcv);
 369                 m_freem(n);
 370                 if (opts)
 371                         m_freem(opts);
 372                 UDPSTAT_INC(udps_fullsock);
 373         } else
 374                 sorwakeup_locked(so);
 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 = 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 = 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                                         udp_append(last, ip, n, iphlen,
 582                                             &udp_in);
 583                                 }
 584                                 INP_RUNLOCK(last);
 585                         }
 586                         last = inp;
 587                         /*
 588                          * Don't look for additional matches if this one does
 589                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 590                          * socket options set.  This heuristic avoids
 591                          * searching through all pcbs in the common case of a
 592                          * non-shared port.  It assumes that an application
 593                          * will never clear these options after setting them.
 594                          */
 595                         if ((last->inp_socket->so_options &
 596                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 597                                 break;
 598                 }
 599
 600                 if (last == NULL) {
 601                         /*
 602                          * No matching pcb found; discard datagram.  (No need
 603                          * to send an ICMP Port Unreachable for a broadcast
 604                          * or multicast datgram.)
 605                          */
 606                         UDPSTAT_INC(udps_noportbcast);
 607                         if (inp)
 608                                 INP_RUNLOCK(inp);
 609                         INP_INFO_RUNLOCK(pcbinfo);
 610                         goto badunlocked;
 611                 }
 612                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 613                 udp_append(last, ip, m, iphlen, &udp_in);
 614                 INP_RUNLOCK(last);
 615                 INP_INFO_RUNLOCK(pcbinfo);
 616                 return (IPPROTO_DONE);
 617         }
 618
 619         /*
 620          * Locate pcb for datagram.
 621          */
 622
 623         /*
 624          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 625          */
 626         if ((m->m_flags & M_IP_NEXTHOP) &&
 627             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 628                 struct sockaddr_in *next_hop;
 629
 630                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 631
 632                 /*
 633                  * Transparently forwarded. Pretend to be the destination.
 634                  * Already got one like this?
 635                  */
 636                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 637                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 638                 if (!inp) {
 639                         /*
 640                          * It's new.  Try to find the ambushing socket.
 641                          * Because we've rewritten the destination address,
 642                          * any hardware-generated hash is ignored.
 643                          */
 644                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 645                             uh->uh_sport, next_hop->sin_addr,
 646                             next_hop->sin_port ? htons(next_hop->sin_port) :
 647                             uh->uh_dport, INPLOOKUP_WILDCARD |
 648                             INPLOOKUP_RLOCKPCB, ifp);
 649                 }
 650                 /* Remove the tag from the packet. We don't need it anymore. */
 651                 m_tag_delete(m, fwd_tag);
 652                 m->m_flags &= ~M_IP_NEXTHOP;
 653         } else
 654                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 655                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 656                     INPLOOKUP_RLOCKPCB, ifp, m);
 657         if (inp == NULL) {
 658                 if (udp_log_in_vain) {
 659                         char buf[4*sizeof "123"];
 660
 661                         strcpy(buf, inet_ntoa(ip->ip_dst));
 662                         log(LOG_INFO,
 663                             "Connection attempt to UDP %s:%d from %s:%d\n",
 664                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 665                             ntohs(uh->uh_sport));
 666                 }
 667                 UDPSTAT_INC(udps_noport);
 668                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 669                         UDPSTAT_INC(udps_noportbcast);
 670                         goto badunlocked;
 671                 }
 672                 if (V_udp_blackhole)
 673                         goto badunlocked;
 674                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 675                         goto badunlocked;
 676                 *ip = save_ip;
 677                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 678                 return (IPPROTO_DONE);
 679         }
 680
 681         /*
 682          * Check the minimum TTL for socket.
 683          */
 684         INP_RLOCK_ASSERT(inp);
 685         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 686                 INP_RUNLOCK(inp);
 687                 m_freem(m);
 688                 return (IPPROTO_DONE);
 689         }
 690         if (cscov_partial) {
 691                 struct udpcb *up;
 692
 693                 up = intoudpcb(inp);
 694                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 695                         INP_RUNLOCK(inp);
 696                         m_freem(m);
 697                         return (IPPROTO_DONE);
 698                 }
 699         }
 700
 701         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 702         udp_append(inp, ip, m, iphlen, &udp_in);
 703         INP_RUNLOCK(inp);
 704         return (IPPROTO_DONE);
 705
 706 badunlocked:
 707         m_freem(m);
 708         return (IPPROTO_DONE);
 709 }
 710 #endif /* INET */
 711
 712 /*
 713  * Notify a udp user of an asynchronous error; just wake up so that they can
 714  * collect error status.
 715  */
 716 struct inpcb *
 717 udp_notify(struct inpcb *inp, int errno)
 718 {
 719
 720         /*
 721          * While udp_ctlinput() always calls udp_notify() with a read lock
 722          * when invoking it directly, in_pcbnotifyall() currently uses write
 723          * locks due to sharing code with TCP.  For now, accept either a read
 724          * or a write lock, but a read lock is sufficient.
 725          */
 726         INP_LOCK_ASSERT(inp);
 727
 728         inp->inp_socket->so_error = errno;
 729         sorwakeup(inp->inp_socket);
 730         sowwakeup(inp->inp_socket);
 731         return (inp);
 732 }
 733
 734 #ifdef INET
 735 static void
 736 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 737     struct inpcbinfo *pcbinfo)
 738 {
 739         struct ip *ip = vip;
 740         struct udphdr *uh;
 741         struct in_addr faddr;
 742         struct inpcb *inp;
 743
 744         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 745         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 746                 return;
 747
 748         /*
 749          * Redirects don't need to be handled up here.
 750          */
 751         if (PRC_IS_REDIRECT(cmd))
 752                 return;
 753
 754         /*
 755          * Hostdead is ugly because it goes linearly through all PCBs.
 756          *
 757          * XXX: We never get this from ICMP, otherwise it makes an excellent
 758          * DoS attack on machines with many connections.
 759          */
 760         if (cmd == PRC_HOSTDEAD)
 761                 ip = NULL;
 762         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 763                 return;
 764         if (ip != NULL) {
 765                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 766                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 767                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 768                 if (inp != NULL) {
 769                         INP_RLOCK_ASSERT(inp);
 770                         if (inp->inp_socket != NULL) {
 771                                 udp_notify(inp, inetctlerrmap[cmd]);
 772                         }
 773                         INP_RUNLOCK(inp);
 774                 }
 775         } else
 776                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 777                     udp_notify);
 778 }
 779 void
 780 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 781 {
 782
 783         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 784 }
 785
 786 void
 787 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 788 {
 789
 790         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 791 }
 792 #endif /* INET */
 793
 794 static int
 795 udp_pcblist(SYSCTL_HANDLER_ARGS)
 796 {
 797         int error, i, n;
 798         struct inpcb *inp, **inp_list;
 799         inp_gen_t gencnt;
 800         struct xinpgen xig;
 801
 802         /*
 803          * The process of preparing the PCB list is too time-consuming and
 804          * resource-intensive to repeat twice on every request.
 805          */
 806         if (req->oldptr == 0) {
 807                 n = V_udbinfo.ipi_count;
 808                 n += imax(n / 8, 10);
 809                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 810                 return (0);
 811         }
 812
 813         if (req->newptr != 0)
 814                 return (EPERM);
 815
 816         /*
 817          * OK, now we're committed to doing something.
 818          */
 819         INP_INFO_RLOCK(&V_udbinfo);
 820         gencnt = V_udbinfo.ipi_gencnt;
 821         n = V_udbinfo.ipi_count;
 822         INP_INFO_RUNLOCK(&V_udbinfo);
 823
 824         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 825                 + n * sizeof(struct xinpcb));
 826         if (error != 0)
 827                 return (error);
 828
 829         xig.xig_len = sizeof xig;
 830         xig.xig_count = n;
 831         xig.xig_gen = gencnt;
 832         xig.xig_sogen = so_gencnt;
 833         error = SYSCTL_OUT(req, &xig, sizeof xig);
 834         if (error)
 835                 return (error);
 836
 837         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 838         if (inp_list == 0)
 839                 return (ENOMEM);
 840
 841         INP_INFO_RLOCK(&V_udbinfo);
 842         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 843              inp = LIST_NEXT(inp, inp_list)) {
 844                 INP_WLOCK(inp);
 845                 if (inp->inp_gencnt <= gencnt &&
 846                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 847                         in_pcbref(inp);
 848                         inp_list[i++] = inp;
 849                 }
 850                 INP_WUNLOCK(inp);
 851         }
 852         INP_INFO_RUNLOCK(&V_udbinfo);
 853         n = i;
 854
 855         error = 0;
 856         for (i = 0; i < n; i++) {
 857                 inp = inp_list[i];
 858                 INP_RLOCK(inp);
 859                 if (inp->inp_gencnt <= gencnt) {
 860                         struct xinpcb xi;
 861
 862                         bzero(&xi, sizeof(xi));
 863                         xi.xi_len = sizeof xi;
 864                         /* XXX should avoid extra copy */
 865                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 866                         if (inp->inp_socket)
 867                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 868                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 869                         INP_RUNLOCK(inp);
 870                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 871                 } else
 872                         INP_RUNLOCK(inp);
 873         }
 874         INP_INFO_WLOCK(&V_udbinfo);
 875         for (i = 0; i < n; i++) {
 876                 inp = inp_list[i];
 877                 INP_RLOCK(inp);
 878                 if (!in_pcbrele_rlocked(inp))
 879                         INP_RUNLOCK(inp);
 880         }
 881         INP_INFO_WUNLOCK(&V_udbinfo);
 882
 883         if (!error) {
 884                 /*
 885                  * Give the user an updated idea of our state.  If the
 886                  * generation differs from what we told her before, she knows
 887                  * that something happened while we were processing this
 888                  * request, and it might be necessary to retry.
 889                  */
 890                 INP_INFO_RLOCK(&V_udbinfo);
 891                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 892                 xig.xig_sogen = so_gencnt;
 893                 xig.xig_count = V_udbinfo.ipi_count;
 894                 INP_INFO_RUNLOCK(&V_udbinfo);
 895                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 896         }
 897         free(inp_list, M_TEMP);
 898         return (error);
 899 }
 900
 901 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 902     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 903     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 904
 905 #ifdef INET
 906 static int
 907 udp_getcred(SYSCTL_HANDLER_ARGS)
 908 {
 909         struct xucred xuc;
 910         struct sockaddr_in addrs[2];
 911         struct inpcb *inp;
 912         int error;
 913
 914         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 915         if (error)
 916                 return (error);
 917         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 918         if (error)
 919                 return (error);
 920         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 921             addrs[0].sin_addr, addrs[0].sin_port,
 922             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 923         if (inp != NULL) {
 924                 INP_RLOCK_ASSERT(inp);
 925                 if (inp->inp_socket == NULL)
 926                         error = ENOENT;
 927                 if (error == 0)
 928                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 929                 if (error == 0)
 930                         cru2x(inp->inp_cred, &xuc);
 931                 INP_RUNLOCK(inp);
 932         } else
 933                 error = ENOENT;
 934         if (error == 0)
 935                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 936         return (error);
 937 }
 938
 939 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 940     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 941     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 942 #endif /* INET */
 943
 944 int
 945 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 946 {
 947         struct inpcb *inp;
 948         struct udpcb *up;
 949         int isudplite, error, optval;
 950
 951         error = 0;
 952         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 953         inp = sotoinpcb(so);
 954         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 955         INP_WLOCK(inp);
 956         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 957 #ifdef INET6
 958                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 959                         INP_WUNLOCK(inp);
 960                         error = ip6_ctloutput(so, sopt);
 961                 }
 962 #endif
 963 #if defined(INET) && defined(INET6)
 964                 else
 965 #endif
 966 #ifdef INET
 967                 {
 968                         INP_WUNLOCK(inp);
 969                         error = ip_ctloutput(so, sopt);
 970                 }
 971 #endif
 972                 return (error);
 973         }
 974
 975         switch (sopt->sopt_dir) {
 976         case SOPT_SET:
 977                 switch (sopt->sopt_name) {
 978                 case UDP_ENCAP:
 979                         INP_WUNLOCK(inp);
 980                         error = sooptcopyin(sopt, &optval, sizeof optval,
 981                                             sizeof optval);
 982                         if (error)
 983                                 break;
 984                         inp = sotoinpcb(so);
 985                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 986                         INP_WLOCK(inp);
 987 #ifdef IPSEC_NAT_T
 988                         up = intoudpcb(inp);
 989                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 990 #endif
 991                         switch (optval) {
 992                         case 0:
 993                                 /* Clear all UDP encap. */
 994 #ifdef IPSEC_NAT_T
 995                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 996 #endif
 997                                 break;
 998 #ifdef IPSEC_NAT_T
 999                         case UDP_ENCAP_ESPINUDP:
1000                         case UDP_ENCAP_ESPINUDP_NON_IKE:
1001                                 up->u_flags &= ~UF_ESPINUDP_ALL;
1002                                 if (optval == UDP_ENCAP_ESPINUDP)
1003                                         up->u_flags |= UF_ESPINUDP;
1004                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
1005                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
1006                                 break;
1007 #endif
1008                         default:
1009                                 error = EINVAL;
1010                                 break;
1011                         }
1012                         INP_WUNLOCK(inp);
1013                         break;
1014                 case UDPLITE_SEND_CSCOV:
1015                 case UDPLITE_RECV_CSCOV:
1016                         if (!isudplite) {
1017                                 INP_WUNLOCK(inp);
1018                                 error = ENOPROTOOPT;
1019                                 break;
1020                         }
1021                         INP_WUNLOCK(inp);
1022                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1023                             sizeof(optval));
1024                         if (error != 0)
1025                                 break;
1026                         inp = sotoinpcb(so);
1027                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1028                         INP_WLOCK(inp);
1029                         up = intoudpcb(inp);
1030                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1031                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1032                                 INP_WUNLOCK(inp);
1033                                 error = EINVAL;
1034                                 break;
1035                         }
1036                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1037                                 up->u_txcslen = optval;
1038                         else
1039                                 up->u_rxcslen = optval;
1040                         INP_WUNLOCK(inp);
1041                         break;
1042                 default:
1043                         INP_WUNLOCK(inp);
1044                         error = ENOPROTOOPT;
1045                         break;
1046                 }
1047                 break;
1048         case SOPT_GET:
1049                 switch (sopt->sopt_name) {
1050 #ifdef IPSEC_NAT_T
1051                 case UDP_ENCAP:
1052                         up = intoudpcb(inp);
1053                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1054                         optval = up->u_flags & UF_ESPINUDP_ALL;
1055                         INP_WUNLOCK(inp);
1056                         error = sooptcopyout(sopt, &optval, sizeof optval);
1057                         break;
1058 #endif
1059                 case UDPLITE_SEND_CSCOV:
1060                 case UDPLITE_RECV_CSCOV:
1061                         if (!isudplite) {
1062                                 INP_WUNLOCK(inp);
1063                                 error = ENOPROTOOPT;
1064                                 break;
1065                         }
1066                         up = intoudpcb(inp);
1067                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1068                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1069                                 optval = up->u_txcslen;
1070                         else
1071                                 optval = up->u_rxcslen;
1072                         INP_WUNLOCK(inp);
1073                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1074                         break;
1075                 default:
1076                         INP_WUNLOCK(inp);
1077                         error = ENOPROTOOPT;
1078                         break;
1079                 }
1080                 break;
1081         }
1082         return (error);
1083 }
1084
1085 #ifdef INET
1086 #define UH_WLOCKED      2
1087 #define UH_RLOCKED      1
1088 #define UH_UNLOCKED     0
1089 static int
1090 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1091     struct mbuf *control, struct thread *td)
1092 {
1093         struct udpiphdr *ui;
1094         int len = m->m_pkthdr.len;
1095         struct in_addr faddr, laddr;
1096         struct cmsghdr *cm;
1097         struct inpcbinfo *pcbinfo;
1098         struct sockaddr_in *sin, src;
1099         int cscov_partial = 0;
1100         int error = 0;
1101         int ipflags;
1102         u_short fport, lport;
1103         int unlock_udbinfo;
1104         u_char tos;
1105         uint8_t pr;
1106         uint16_t cscov = 0;
1107         uint32_t flowid = 0;
1108         uint8_t flowtype = M_HASHTYPE_NONE;
1109
1110         /*
1111          * udp_output() may need to temporarily bind or connect the current
1112          * inpcb.  As such, we don't know up front whether we will need the
1113          * pcbinfo lock or not.  Do any work to decide what is needed up
1114          * front before acquiring any locks.
1115          */
1116         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1117                 if (control)
1118                         m_freem(control);
1119                 m_freem(m);
1120                 return (EMSGSIZE);
1121         }
1122
1123         src.sin_family = 0;
1124         INP_RLOCK(inp);
1125         tos = inp->inp_ip_tos;
1126         if (control != NULL) {
1127                 /*
1128                  * XXX: Currently, we assume all the optional information is
1129                  * stored in a single mbuf.
1130                  */
1131                 if (control->m_next) {
1132                         INP_RUNLOCK(inp);
1133                         m_freem(control);
1134                         m_freem(m);
1135                         return (EINVAL);
1136                 }
1137                 for (; control->m_len > 0;
1138                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1139                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1140                         cm = mtod(control, struct cmsghdr *);
1141                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1142                             || cm->cmsg_len > control->m_len) {
1143                                 error = EINVAL;
1144                                 break;
1145                         }
1146                         if (cm->cmsg_level != IPPROTO_IP)
1147                                 continue;
1148
1149                         switch (cm->cmsg_type) {
1150                         case IP_SENDSRCADDR:
1151                                 if (cm->cmsg_len !=
1152                                     CMSG_LEN(sizeof(struct in_addr))) {
1153                                         error = EINVAL;
1154                                         break;
1155                                 }
1156                                 bzero(&src, sizeof(src));
1157                                 src.sin_family = AF_INET;
1158                                 src.sin_len = sizeof(src);
1159                                 src.sin_port = inp->inp_lport;
1160                                 src.sin_addr =
1161                                     *(struct in_addr *)CMSG_DATA(cm);
1162                                 break;
1163
1164                         case IP_TOS:
1165                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1166                                         error = EINVAL;
1167                                         break;
1168                                 }
1169                                 tos = *(u_char *)CMSG_DATA(cm);
1170                                 break;
1171
1172                         case IP_FLOWID:
1173                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1174                                         error = EINVAL;
1175                                         break;
1176                                 }
1177                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1178                                 break;
1179
1180                         case IP_FLOWTYPE:
1181                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1182                                         error = EINVAL;
1183                                         break;
1184                                 }
1185                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1186                                 break;
1187
1188 #ifdef  RSS
1189                         case IP_RSSBUCKETID:
1190                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1191                                         error = EINVAL;
1192                                         break;
1193                                 }
1194                                 /* This is just a placeholder for now */
1195                                 break;
1196 #endif  /* RSS */
1197                         default:
1198                                 error = ENOPROTOOPT;
1199                                 break;
1200                         }
1201                         if (error)
1202                                 break;
1203                 }
1204                 m_freem(control);
1205         }
1206         if (error) {
1207                 INP_RUNLOCK(inp);
1208                 m_freem(m);
1209                 return (error);
1210         }
1211
1212         /*
1213          * Depending on whether or not the application has bound or connected
1214          * the socket, we may have to do varying levels of work.  The optimal
1215          * case is for a connected UDP socket, as a global lock isn't
1216          * required at all.
1217          *
1218          * In order to decide which we need, we require stability of the
1219          * inpcb binding, which we ensure by acquiring a read lock on the
1220          * inpcb.  This doesn't strictly follow the lock order, so we play
1221          * the trylock and retry game; note that we may end up with more
1222          * conservative locks than required the second time around, so later
1223          * assertions have to accept that.  Further analysis of the number of
1224          * misses under contention is required.
1225          *
1226          * XXXRW: Check that hash locking update here is correct.
1227          */
1228         pr = inp->inp_socket->so_proto->pr_protocol;
1229         pcbinfo = get_inpcbinfo(pr);
1230         sin = (struct sockaddr_in *)addr;
1231         if (sin != NULL &&
1232             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1233                 INP_RUNLOCK(inp);
1234                 INP_WLOCK(inp);
1235                 INP_HASH_WLOCK(pcbinfo);
1236                 unlock_udbinfo = UH_WLOCKED;
1237         } else if ((sin != NULL && (
1238             (sin->sin_addr.s_addr == INADDR_ANY) ||
1239             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1240             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1241             (inp->inp_lport == 0))) ||
1242             (src.sin_family == AF_INET)) {
1243                 INP_HASH_RLOCK(pcbinfo);
1244                 unlock_udbinfo = UH_RLOCKED;
1245         } else
1246                 unlock_udbinfo = UH_UNLOCKED;
1247
1248         /*
1249          * If the IP_SENDSRCADDR control message was specified, override the
1250          * source address for this datagram.  Its use is invalidated if the
1251          * address thus specified is incomplete or clobbers other inpcbs.
1252          */
1253         laddr = inp->inp_laddr;
1254         lport = inp->inp_lport;
1255         if (src.sin_family == AF_INET) {
1256                 INP_HASH_LOCK_ASSERT(pcbinfo);
1257                 if ((lport == 0) ||
1258                     (laddr.s_addr == INADDR_ANY &&
1259                      src.sin_addr.s_addr == INADDR_ANY)) {
1260                         error = EINVAL;
1261                         goto release;
1262                 }
1263                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1264                     &laddr.s_addr, &lport, td->td_ucred);
1265                 if (error)
1266                         goto release;
1267         }
1268
1269         /*
1270          * If a UDP socket has been connected, then a local address/port will
1271          * have been selected and bound.
1272          *
1273          * If a UDP socket has not been connected to, then an explicit
1274          * destination address must be used, in which case a local
1275          * address/port may not have been selected and bound.
1276          */
1277         if (sin != NULL) {
1278                 INP_LOCK_ASSERT(inp);
1279                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1280                         error = EISCONN;
1281                         goto release;
1282                 }
1283
1284                 /*
1285                  * Jail may rewrite the destination address, so let it do
1286                  * that before we use it.
1287                  */
1288                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1289                 if (error)
1290                         goto release;
1291
1292                 /*
1293                  * If a local address or port hasn't yet been selected, or if
1294                  * the destination address needs to be rewritten due to using
1295                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1296                  * to do the heavy lifting.  Once a port is selected, we
1297                  * commit the binding back to the socket; we also commit the
1298                  * binding of the address if in jail.
1299                  *
1300                  * If we already have a valid binding and we're not
1301                  * requesting a destination address rewrite, use a fast path.
1302                  */
1303                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1304                     inp->inp_lport == 0 ||
1305                     sin->sin_addr.s_addr == INADDR_ANY ||
1306                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1307                         INP_HASH_LOCK_ASSERT(pcbinfo);
1308                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1309                             &lport, &faddr.s_addr, &fport, NULL,
1310                             td->td_ucred);
1311                         if (error)
1312                                 goto release;
1313
1314                         /*
1315                          * XXXRW: Why not commit the port if the address is
1316                          * !INADDR_ANY?
1317                          */
1318                         /* Commit the local port if newly assigned. */
1319                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1320                             inp->inp_lport == 0) {
1321                                 INP_WLOCK_ASSERT(inp);
1322                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1323                                 /*
1324                                  * Remember addr if jailed, to prevent
1325                                  * rebinding.
1326                                  */
1327                                 if (prison_flag(td->td_ucred, PR_IP4))
1328                                         inp->inp_laddr = laddr;
1329                                 inp->inp_lport = lport;
1330                                 if (in_pcbinshash(inp) != 0) {
1331                                         inp->inp_lport = 0;
1332                                         error = EAGAIN;
1333                                         goto release;
1334                                 }
1335                                 inp->inp_flags |= INP_ANONPORT;
1336                         }
1337                 } else {
1338                         faddr = sin->sin_addr;
1339                         fport = sin->sin_port;
1340                 }
1341         } else {
1342                 INP_LOCK_ASSERT(inp);
1343                 faddr = inp->inp_faddr;
1344                 fport = inp->inp_fport;
1345                 if (faddr.s_addr == INADDR_ANY) {
1346                         error = ENOTCONN;
1347                         goto release;
1348                 }
1349         }
1350
1351         /*
1352          * Calculate data length and get a mbuf for UDP, IP, and possible
1353          * link-layer headers.  Immediate slide the data pointer back forward
1354          * since we won't use that space at this layer.
1355          */
1356         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1357         if (m == NULL) {
1358                 error = ENOBUFS;
1359                 goto release;
1360         }
1361         m->m_data += max_linkhdr;
1362         m->m_len -= max_linkhdr;
1363         m->m_pkthdr.len -= max_linkhdr;
1364
1365         /*
1366          * Fill in mbuf with extended UDP header and addresses and length put
1367          * into network format.
1368          */
1369         ui = mtod(m, struct udpiphdr *);
1370         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1371         ui->ui_pr = pr;
1372         ui->ui_src = laddr;
1373         ui->ui_dst = faddr;
1374         ui->ui_sport = lport;
1375         ui->ui_dport = fport;
1376         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1377         if (pr == IPPROTO_UDPLITE) {
1378                 struct udpcb *up;
1379                 uint16_t plen;
1380
1381                 up = intoudpcb(inp);
1382                 cscov = up->u_txcslen;
1383                 plen = (u_short)len + sizeof(struct udphdr);
1384                 if (cscov >= plen)
1385                         cscov = 0;
1386                 ui->ui_len = htons(plen);
1387                 ui->ui_ulen = htons(cscov);
1388                 /*
1389                  * For UDP-Lite, checksum coverage length of zero means
1390                  * the entire UDPLite packet is covered by the checksum.
1391                  */
1392                 cscov_partial = (cscov == 0) ? 0 : 1;
1393         } else
1394                 ui->ui_v = IPVERSION << 4;
1395
1396         /*
1397          * Set the Don't Fragment bit in the IP header.
1398          */
1399         if (inp->inp_flags & INP_DONTFRAG) {
1400                 struct ip *ip;
1401
1402                 ip = (struct ip *)&ui->ui_i;
1403                 ip->ip_off |= htons(IP_DF);
1404         }
1405
1406         ipflags = 0;
1407         if (inp->inp_socket->so_options & SO_DONTROUTE)
1408                 ipflags |= IP_ROUTETOIF;
1409         if (inp->inp_socket->so_options & SO_BROADCAST)
1410                 ipflags |= IP_ALLOWBROADCAST;
1411         if (inp->inp_flags & INP_ONESBCAST)
1412                 ipflags |= IP_SENDONES;
1413
1414 #ifdef MAC
1415         mac_inpcb_create_mbuf(inp, m);
1416 #endif
1417
1418         /*
1419          * Set up checksum and output datagram.
1420          */
1421         ui->ui_sum = 0;
1422         if (pr == IPPROTO_UDPLITE) {
1423                 if (inp->inp_flags & INP_ONESBCAST)
1424                         faddr.s_addr = INADDR_BROADCAST;
1425                 if (cscov_partial) {
1426                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1427                                 ui->ui_sum = 0xffff;
1428                 } else {
1429                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1430                                 ui->ui_sum = 0xffff;
1431                 }
1432         } else if (V_udp_cksum) {
1433                 if (inp->inp_flags & INP_ONESBCAST)
1434                         faddr.s_addr = INADDR_BROADCAST;
1435                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1436                     htons((u_short)len + sizeof(struct udphdr) + pr));
1437                 m->m_pkthdr.csum_flags = CSUM_UDP;
1438                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1439         }
1440         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1441         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1442         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1443         UDPSTAT_INC(udps_opackets);
1444
1445         /*
1446          * Setup flowid / RSS information for outbound socket.
1447          *
1448          * Once the UDP code decides to set a flowid some other way,
1449          * this allows the flowid to be overridden by userland.
1450          */
1451         if (flowtype != M_HASHTYPE_NONE) {
1452                 m->m_pkthdr.flowid = flowid;
1453                 M_HASHTYPE_SET(m, flowtype);
1454 #ifdef  RSS
1455         } else {
1456                 uint32_t hash_val, hash_type;
1457                 /*
1458                  * Calculate an appropriate RSS hash for UDP and
1459                  * UDP Lite.
1460                  *
1461                  * The called function will take care of figuring out
1462                  * whether a 2-tuple or 4-tuple hash is required based
1463                  * on the currently configured scheme.
1464                  *
1465                  * Later later on connected socket values should be
1466                  * cached in the inpcb and reused, rather than constantly
1467                  * re-calculating it.
1468                  *
1469                  * UDP Lite is a different protocol number and will
1470                  * likely end up being hashed as a 2-tuple until
1471                  * RSS / NICs grow UDP Lite protocol awareness.
1472                  */
1473                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1474                     pr, &hash_val, &hash_type) == 0) {
1475                         m->m_pkthdr.flowid = hash_val;
1476                         M_HASHTYPE_SET(m, hash_type);
1477                 }
1478 #endif
1479         }
1480
1481 #ifdef  RSS
1482         /*
1483          * Don't override with the inp cached flowid value.
1484          *
1485          * Depending upon the kind of send being done, the inp
1486          * flowid/flowtype values may actually not be appropriate
1487          * for this particular socket send.
1488          *
1489          * We should either leave the flowid at zero (which is what is
1490          * currently done) or set it to some software generated
1491          * hash value based on the packet contents.
1492          */
1493         ipflags |= IP_NODEFAULTFLOWID;
1494 #endif  /* RSS */
1495
1496         if (unlock_udbinfo == UH_WLOCKED)
1497                 INP_HASH_WUNLOCK(pcbinfo);
1498         else if (unlock_udbinfo == UH_RLOCKED)
1499                 INP_HASH_RUNLOCK(pcbinfo);
1500         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1501         error = ip_output(m, inp->inp_options, NULL, ipflags,
1502             inp->inp_moptions, inp);
1503         if (unlock_udbinfo == UH_WLOCKED)
1504                 INP_WUNLOCK(inp);
1505         else
1506                 INP_RUNLOCK(inp);
1507         return (error);
1508
1509 release:
1510         if (unlock_udbinfo == UH_WLOCKED) {
1511                 INP_HASH_WUNLOCK(pcbinfo);
1512                 INP_WUNLOCK(inp);
1513         } else if (unlock_udbinfo == UH_RLOCKED) {
1514                 INP_HASH_RUNLOCK(pcbinfo);
1515                 INP_RUNLOCK(inp);
1516         } else
1517                 INP_RUNLOCK(inp);
1518         m_freem(m);
1519         return (error);
1520 }
1521
1522
1523 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1524 /*
1525  * Potentially decap ESP in UDP frame.  Check for an ESP header
1526  * and optional marker; if present, strip the UDP header and
1527  * push the result through IPSec.
1528  *
1529  * Returns mbuf to be processed (potentially re-allocated) or
1530  * NULL if consumed and/or processed.
1531  */
1532 static struct mbuf *
1533 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1534 {
1535         size_t minlen, payload, skip, iphlen;
1536         caddr_t data;
1537         struct udpcb *up;
1538         struct m_tag *tag;
1539         struct udphdr *udphdr;
1540         struct ip *ip;
1541
1542         INP_RLOCK_ASSERT(inp);
1543
1544         /*
1545          * Pull up data so the longest case is contiguous:
1546          *    IP/UDP hdr + non ESP marker + ESP hdr.
1547          */
1548         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1549         if (minlen > m->m_pkthdr.len)
1550                 minlen = m->m_pkthdr.len;
1551         if ((m = m_pullup(m, minlen)) == NULL) {
1552                 IPSECSTAT_INC(ips_in_inval);
1553                 return (NULL);          /* Bypass caller processing. */
1554         }
1555         data = mtod(m, caddr_t);        /* Points to ip header. */
1556         payload = m->m_len - off;       /* Size of payload. */
1557
1558         if (payload == 1 && data[off] == '\xff')
1559                 return (m);             /* NB: keepalive packet, no decap. */
1560
1561         up = intoudpcb(inp);
1562         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1563         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1564             ("u_flags 0x%x", up->u_flags));
1565
1566         /*
1567          * Check that the payload is large enough to hold an
1568          * ESP header and compute the amount of data to remove.
1569          *
1570          * NB: the caller has already done a pullup for us.
1571          * XXX can we assume alignment and eliminate bcopys?
1572          */
1573         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1574                 /*
1575                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1576                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1577                  * possible AH mode non-IKE marker+non-ESP marker
1578                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1579                  */
1580                 uint64_t marker;
1581
1582                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1583                         return (m);     /* NB: no decap. */
1584                 bcopy(data + off, &marker, sizeof(uint64_t));
1585                 if (marker != 0)        /* Non-IKE marker. */
1586                         return (m);     /* NB: no decap. */
1587                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1588         } else {
1589                 uint32_t spi;
1590
1591                 if (payload <= sizeof(struct esp)) {
1592                         IPSECSTAT_INC(ips_in_inval);
1593                         m_freem(m);
1594                         return (NULL);  /* Discard. */
1595                 }
1596                 bcopy(data + off, &spi, sizeof(uint32_t));
1597                 if (spi == 0)           /* Non-ESP marker. */
1598                         return (m);     /* NB: no decap. */
1599                 skip = sizeof(struct udphdr);
1600         }
1601
1602         /*
1603          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1604          * the UDP ports. This is required if we want to select
1605          * the right SPD for multiple hosts behind same NAT.
1606          *
1607          * NB: ports are maintained in network byte order everywhere
1608          *     in the NAT-T code.
1609          */
1610         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1611                 2 * sizeof(uint16_t), M_NOWAIT);
1612         if (tag == NULL) {
1613                 IPSECSTAT_INC(ips_in_nomem);
1614                 m_freem(m);
1615                 return (NULL);          /* Discard. */
1616         }
1617         iphlen = off - sizeof(struct udphdr);
1618         udphdr = (struct udphdr *)(data + iphlen);
1619         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1620         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1621         m_tag_prepend(m, tag);
1622
1623         /*
1624          * Remove the UDP header (and possibly the non ESP marker)
1625          * IP header length is iphlen
1626          * Before:
1627          *   <--- off --->
1628          *   +----+------+-----+
1629          *   | IP |  UDP | ESP |
1630          *   +----+------+-----+
1631          *        <-skip->
1632          * After:
1633          *          +----+-----+
1634          *          | IP | ESP |
1635          *          +----+-----+
1636          *   <-skip->
1637          */
1638         ovbcopy(data, data + skip, iphlen);
1639         m_adj(m, skip);
1640
1641         ip = mtod(m, struct ip *);
1642         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1643         ip->ip_p = IPPROTO_ESP;
1644
1645         /*
1646          * We cannot yet update the cksums so clear any
1647          * h/w cksum flags as they are no longer valid.
1648          */
1649         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1650                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1651
1652         (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1653         return (NULL);                  /* NB: consumed, bypass processing. */
1654 }
1655 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1656
1657 static void
1658 udp_abort(struct socket *so)
1659 {
1660         struct inpcb *inp;
1661         struct inpcbinfo *pcbinfo;
1662
1663         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1664         inp = sotoinpcb(so);
1665         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1666         INP_WLOCK(inp);
1667         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1668                 INP_HASH_WLOCK(pcbinfo);
1669                 in_pcbdisconnect(inp);
1670                 inp->inp_laddr.s_addr = INADDR_ANY;
1671                 INP_HASH_WUNLOCK(pcbinfo);
1672                 soisdisconnected(so);
1673         }
1674         INP_WUNLOCK(inp);
1675 }
1676
1677 static int
1678 udp_attach(struct socket *so, int proto, struct thread *td)
1679 {
1680         struct inpcb *inp;
1681         struct inpcbinfo *pcbinfo;
1682         int error;
1683
1684         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1685         inp = sotoinpcb(so);
1686         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1687         error = soreserve(so, udp_sendspace, udp_recvspace);
1688         if (error)
1689                 return (error);
1690         INP_INFO_WLOCK(pcbinfo);
1691         error = in_pcballoc(so, pcbinfo);
1692         if (error) {
1693                 INP_INFO_WUNLOCK(pcbinfo);
1694                 return (error);
1695         }
1696
1697         inp = sotoinpcb(so);
1698         inp->inp_vflag |= INP_IPV4;
1699         inp->inp_ip_ttl = V_ip_defttl;
1700
1701         error = udp_newudpcb(inp);
1702         if (error) {
1703                 in_pcbdetach(inp);
1704                 in_pcbfree(inp);
1705                 INP_INFO_WUNLOCK(pcbinfo);
1706                 return (error);
1707         }
1708
1709         INP_WUNLOCK(inp);
1710         INP_INFO_WUNLOCK(pcbinfo);
1711         return (0);
1712 }
1713 #endif /* INET */
1714
1715 int
1716 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, void *ctx)
1717 {
1718         struct inpcb *inp;
1719         struct udpcb *up;
1720
1721         KASSERT(so->so_type == SOCK_DGRAM,
1722             ("udp_set_kernel_tunneling: !dgram"));
1723         inp = sotoinpcb(so);
1724         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1725         INP_WLOCK(inp);
1726         up = intoudpcb(inp);
1727         if (up->u_tun_func != NULL) {
1728                 INP_WUNLOCK(inp);
1729                 return (EBUSY);
1730         }
1731         up->u_tun_func = f;
1732         up->u_tun_ctx = ctx;
1733         INP_WUNLOCK(inp);
1734         return (0);
1735 }
1736
1737 #ifdef INET
1738 static int
1739 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1740 {
1741         struct inpcb *inp;
1742         struct inpcbinfo *pcbinfo;
1743         int error;
1744
1745         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1746         inp = sotoinpcb(so);
1747         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1748         INP_WLOCK(inp);
1749         INP_HASH_WLOCK(pcbinfo);
1750         error = in_pcbbind(inp, nam, td->td_ucred);
1751         INP_HASH_WUNLOCK(pcbinfo);
1752         INP_WUNLOCK(inp);
1753         return (error);
1754 }
1755
1756 static void
1757 udp_close(struct socket *so)
1758 {
1759         struct inpcb *inp;
1760         struct inpcbinfo *pcbinfo;
1761
1762         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1763         inp = sotoinpcb(so);
1764         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1765         INP_WLOCK(inp);
1766         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1767                 INP_HASH_WLOCK(pcbinfo);
1768                 in_pcbdisconnect(inp);
1769                 inp->inp_laddr.s_addr = INADDR_ANY;
1770                 INP_HASH_WUNLOCK(pcbinfo);
1771                 soisdisconnected(so);
1772         }
1773         INP_WUNLOCK(inp);
1774 }
1775
1776 static int
1777 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1778 {
1779         struct inpcb *inp;
1780         struct inpcbinfo *pcbinfo;
1781         struct sockaddr_in *sin;
1782         int error;
1783
1784         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1785         inp = sotoinpcb(so);
1786         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1787         INP_WLOCK(inp);
1788         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1789                 INP_WUNLOCK(inp);
1790                 return (EISCONN);
1791         }
1792         sin = (struct sockaddr_in *)nam;
1793         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1794         if (error != 0) {
1795                 INP_WUNLOCK(inp);
1796                 return (error);
1797         }
1798         INP_HASH_WLOCK(pcbinfo);
1799         error = in_pcbconnect(inp, nam, td->td_ucred);
1800         INP_HASH_WUNLOCK(pcbinfo);
1801         if (error == 0)
1802                 soisconnected(so);
1803         INP_WUNLOCK(inp);
1804         return (error);
1805 }
1806
1807 static void
1808 udp_detach(struct socket *so)
1809 {
1810         struct inpcb *inp;
1811         struct inpcbinfo *pcbinfo;
1812         struct udpcb *up;
1813
1814         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1815         inp = sotoinpcb(so);
1816         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1817         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1818             ("udp_detach: not disconnected"));
1819         INP_INFO_WLOCK(pcbinfo);
1820         INP_WLOCK(inp);
1821         up = intoudpcb(inp);
1822         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1823         inp->inp_ppcb = NULL;
1824         in_pcbdetach(inp);
1825         in_pcbfree(inp);
1826         INP_INFO_WUNLOCK(pcbinfo);
1827         udp_discardcb(up);
1828 }
1829
1830 static int
1831 udp_disconnect(struct socket *so)
1832 {
1833         struct inpcb *inp;
1834         struct inpcbinfo *pcbinfo;
1835
1836         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1837         inp = sotoinpcb(so);
1838         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1839         INP_WLOCK(inp);
1840         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1841                 INP_WUNLOCK(inp);
1842                 return (ENOTCONN);
1843         }
1844         INP_HASH_WLOCK(pcbinfo);
1845         in_pcbdisconnect(inp);
1846         inp->inp_laddr.s_addr = INADDR_ANY;
1847         INP_HASH_WUNLOCK(pcbinfo);
1848         SOCK_LOCK(so);
1849         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1850         SOCK_UNLOCK(so);
1851         INP_WUNLOCK(inp);
1852         return (0);
1853 }
1854
1855 static int
1856 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1857     struct mbuf *control, struct thread *td)
1858 {
1859         struct inpcb *inp;
1860
1861         inp = sotoinpcb(so);
1862         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1863         return (udp_output(inp, m, addr, control, td));
1864 }
1865 #endif /* INET */
1866
1867 int
1868 udp_shutdown(struct socket *so)
1869 {
1870         struct inpcb *inp;
1871
1872         inp = sotoinpcb(so);
1873         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1874         INP_WLOCK(inp);
1875         socantsendmore(so);
1876         INP_WUNLOCK(inp);
1877         return (0);
1878 }
1879
1880 #ifdef INET
1881 struct pr_usrreqs udp_usrreqs = {
1882         .pru_abort =            udp_abort,
1883         .pru_attach =           udp_attach,
1884         .pru_bind =             udp_bind,
1885         .pru_connect =          udp_connect,
1886         .pru_control =          in_control,
1887         .pru_detach =           udp_detach,
1888         .pru_disconnect =       udp_disconnect,
1889         .pru_peeraddr =         in_getpeeraddr,
1890         .pru_send =             udp_send,
1891         .pru_soreceive =        soreceive_dgram,
1892         .pru_sosend =           sosend_dgram,
1893         .pru_shutdown =         udp_shutdown,
1894         .pru_sockaddr =         in_getsockaddr,
1895         .pru_sosetlabel =       in_pcbsosetlabel,
1896         .pru_close =            udp_close,
1897 };
1898 #endif /* INET */