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 #include <net/rss_config.h>
  74
  75 #include <netinet/in.h>
  76 #include <netinet/in_kdtrace.h>
  77 #include <netinet/in_pcb.h>
  78 #include <netinet/in_systm.h>
  79 #include <netinet/in_var.h>
  80 #include <netinet/ip.h>
  81 #ifdef INET6
  82 #include <netinet/ip6.h>
  83 #endif
  84 #include <netinet/ip_icmp.h>
  85 #include <netinet/icmp_var.h>
  86 #include <netinet/ip_var.h>
  87 #include <netinet/ip_options.h>
  88 #ifdef INET6
  89 #include <netinet6/ip6_var.h>
  90 #endif
  91 #include <netinet/udp.h>
  92 #include <netinet/udp_var.h>
  93 #include <netinet/udplite.h>
  94 #include <netinet/in_rss.h>
  95
  96 #ifdef IPSEC
  97 #include <netipsec/ipsec.h>
  98 #include <netipsec/esp.h>
  99 #endif
 100
 101 #include <machine/in_cksum.h>
 102
 103 #include <security/mac/mac_framework.h>
 104
 105 /*
 106  * UDP and UDP-Lite protocols implementation.
 107  * Per RFC 768, August, 1980.
 108  * Per RFC 3828, July, 2004.
 109  */
 110
 111 /*
 112  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 113  * removes the only data integrity mechanism for packets and malformed
 114  * packets that would otherwise be discarded due to bad checksums, and may
 115  * cause problems (especially for NFS data blocks).
 116  */
 117 VNET_DEFINE(int, udp_cksum) = 1;
 118 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 119     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 120
 121 int     udp_log_in_vain = 0;
 122 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 123     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 124
 125 VNET_DEFINE(int, udp_blackhole) = 0;
 126 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 127     &VNET_NAME(udp_blackhole), 0,
 128     "Do not send port unreachables for refused connects");
 129
 130 u_long  udp_sendspace = 9216;           /* really max datagram size */
 131                                         /* 40 1K datagrams */
 132 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 133     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 134
 135 u_long  udp_recvspace = 40 * (1024 +
 136 #ifdef INET6
 137                                       sizeof(struct sockaddr_in6)
 138 #else
 139                                       sizeof(struct sockaddr_in)
 140 #endif
 141                                       );
 142
 143 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 144     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 145
 146 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 147 VNET_DEFINE(struct inpcbinfo, udbinfo);
 148 VNET_DEFINE(struct inpcbhead, ulitecb);
 149 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 150 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 151 #define V_udpcb_zone                    VNET(udpcb_zone)
 152
 153 #ifndef UDBHASHSIZE
 154 #define UDBHASHSIZE     128
 155 #endif
 156
 157 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 158 VNET_PCPUSTAT_SYSINIT(udpstat);
 159 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 160     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 161
 162 #ifdef VIMAGE
 163 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 164 #endif /* VIMAGE */
 165 #ifdef INET
 166 static void     udp_detach(struct socket *so);
 167 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 168                     struct mbuf *, struct thread *);
 169 #endif
 170
 171 #ifdef IPSEC
 172 #ifdef IPSEC_NAT_T
 173 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
 174 #ifdef INET
 175 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
 176 #endif
 177 #endif /* IPSEC_NAT_T */
 178 #endif /* IPSEC */
 179
 180 static void
 181 udp_zone_change(void *tag)
 182 {
 183
 184         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 185         uma_zone_set_max(V_udpcb_zone, maxsockets);
 186 }
 187
 188 static int
 189 udp_inpcb_init(void *mem, int size, int flags)
 190 {
 191         struct inpcb *inp;
 192
 193         inp = mem;
 194         INP_LOCK_INIT(inp, "inp", "udpinp");
 195         return (0);
 196 }
 197
 198 static int
 199 udplite_inpcb_init(void *mem, int size, int flags)
 200 {
 201         struct inpcb *inp;
 202
 203         inp = mem;
 204         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 205         return (0);
 206 }
 207
 208 void
 209 udp_init(void)
 210 {
 211
 212         /*
 213          * For now default to 2-tuple UDP hashing - until the fragment
 214          * reassembly code can also update the flowid.
 215          *
 216          * Once we can calculate the flowid that way and re-establish
 217          * a 4-tuple, flip this to 4-tuple.
 218          */
 219         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 220             "udp_inpcb", udp_inpcb_init, NULL, 0,
 221             IPI_HASHFIELDS_2TUPLE);
 222         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 223             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 224         uma_zone_set_max(V_udpcb_zone, maxsockets);
 225         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 226         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 227             EVENTHANDLER_PRI_ANY);
 228 }
 229
 230 void
 231 udplite_init(void)
 232 {
 233
 234         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 235             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 236             0, IPI_HASHFIELDS_2TUPLE);
 237 }
 238
 239 /*
 240  * Kernel module interface for updating udpstat.  The argument is an index
 241  * into udpstat treated as an array of u_long.  While this encodes the
 242  * general layout of udpstat into the caller, it doesn't encode its location,
 243  * so that future changes to add, for example, per-CPU stats support won't
 244  * cause binary compatibility problems for kernel modules.
 245  */
 246 void
 247 kmod_udpstat_inc(int statnum)
 248 {
 249
 250         counter_u64_add(VNET(udpstat)[statnum], 1);
 251 }
 252
 253 int
 254 udp_newudpcb(struct inpcb *inp)
 255 {
 256         struct udpcb *up;
 257
 258         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 259         if (up == NULL)
 260                 return (ENOBUFS);
 261         inp->inp_ppcb = up;
 262         return (0);
 263 }
 264
 265 void
 266 udp_discardcb(struct udpcb *up)
 267 {
 268
 269         uma_zfree(V_udpcb_zone, up);
 270 }
 271
 272 #ifdef VIMAGE
 273 void
 274 udp_destroy(void)
 275 {
 276
 277         in_pcbinfo_destroy(&V_udbinfo);
 278         uma_zdestroy(V_udpcb_zone);
 279 }
 280
 281 void
 282 udplite_destroy(void)
 283 {
 284
 285         in_pcbinfo_destroy(&V_ulitecbinfo);
 286 }
 287 #endif
 288
 289 #ifdef INET
 290 /*
 291  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 292  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 293  * contains the source address.  If the socket ends up being an IPv6 socket,
 294  * udp_append() will convert to a sockaddr_in6 before passing the address
 295  * into the socket code.
 296  */
 297 static void
 298 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 299     struct sockaddr_in *udp_in)
 300 {
 301         struct sockaddr *append_sa;
 302         struct socket *so;
 303         struct mbuf *opts = 0;
 304 #ifdef INET6
 305         struct sockaddr_in6 udp_in6;
 306 #endif
 307         struct udpcb *up;
 308
 309         INP_LOCK_ASSERT(inp);
 310
 311         /*
 312          * Engage the tunneling protocol.
 313          */
 314         up = intoudpcb(inp);
 315         if (up->u_tun_func != NULL) {
 316                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 317                     up->u_tun_ctx);
 318                 return;
 319         }
 320
 321         off += sizeof(struct udphdr);
 322
 323 #ifdef IPSEC
 324         /* Check AH/ESP integrity. */
 325         if (ipsec4_in_reject(n, inp)) {
 326                 m_freem(n);
 327                 return;
 328         }
 329 #ifdef IPSEC_NAT_T
 330         up = intoudpcb(inp);
 331         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 332         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 333                 n = udp4_espdecap(inp, n, off);
 334                 if (n == NULL)                          /* Consumed. */
 335                         return;
 336         }
 337 #endif /* IPSEC_NAT_T */
 338 #endif /* IPSEC */
 339 #ifdef MAC
 340         if (mac_inpcb_check_deliver(inp, n) != 0) {
 341                 m_freem(n);
 342                 return;
 343         }
 344 #endif /* MAC */
 345         if (inp->inp_flags & INP_CONTROLOPTS ||
 346             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 347 #ifdef INET6
 348                 if (inp->inp_vflag & INP_IPV6)
 349                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 350                 else
 351 #endif /* INET6 */
 352                         ip_savecontrol(inp, &opts, ip, n);
 353         }
 354 #ifdef INET6
 355         if (inp->inp_vflag & INP_IPV6) {
 356                 bzero(&udp_in6, sizeof(udp_in6));
 357                 udp_in6.sin6_len = sizeof(udp_in6);
 358                 udp_in6.sin6_family = AF_INET6;
 359                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 360                 append_sa = (struct sockaddr *)&udp_in6;
 361         } else
 362 #endif /* INET6 */
 363                 append_sa = (struct sockaddr *)udp_in;
 364         m_adj(n, off);
 365
 366         so = inp->inp_socket;
 367         SOCKBUF_LOCK(&so->so_rcv);
 368         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 369                 SOCKBUF_UNLOCK(&so->so_rcv);
 370                 m_freem(n);
 371                 if (opts)
 372                         m_freem(opts);
 373                 UDPSTAT_INC(udps_fullsock);
 374         } else
 375                 sorwakeup_locked(so);
 376 }
 377
 378 int
 379 udp_input(struct mbuf **mp, int *offp, int proto)
 380 {
 381         struct ip *ip;
 382         struct udphdr *uh;
 383         struct ifnet *ifp;
 384         struct inpcb *inp;
 385         uint16_t len, ip_len;
 386         struct inpcbinfo *pcbinfo;
 387         struct ip save_ip;
 388         struct sockaddr_in udp_in;
 389         struct mbuf *m;
 390         struct m_tag *fwd_tag;
 391         int cscov_partial, iphlen;
 392
 393         m = *mp;
 394         iphlen = *offp;
 395         ifp = m->m_pkthdr.rcvif;
 396         *mp = NULL;
 397         UDPSTAT_INC(udps_ipackets);
 398
 399         /*
 400          * Strip IP options, if any; should skip this, make available to
 401          * user, and use on returned packets, but we don't yet have a way to
 402          * check the checksum with options still present.
 403          */
 404         if (iphlen > sizeof (struct ip)) {
 405                 ip_stripoptions(m);
 406                 iphlen = sizeof(struct ip);
 407         }
 408
 409         /*
 410          * Get IP and UDP header together in first mbuf.
 411          */
 412         ip = mtod(m, struct ip *);
 413         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 414                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 415                         UDPSTAT_INC(udps_hdrops);
 416                         return (IPPROTO_DONE);
 417                 }
 418                 ip = mtod(m, struct ip *);
 419         }
 420         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 421         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 422
 423         /*
 424          * Destination port of 0 is illegal, based on RFC768.
 425          */
 426         if (uh->uh_dport == 0)
 427                 goto badunlocked;
 428
 429         /*
 430          * Construct sockaddr format source address.  Stuff source address
 431          * and datagram in user buffer.
 432          */
 433         bzero(&udp_in, sizeof(udp_in));
 434         udp_in.sin_len = sizeof(udp_in);
 435         udp_in.sin_family = AF_INET;
 436         udp_in.sin_port = uh->uh_sport;
 437         udp_in.sin_addr = ip->ip_src;
 438
 439         /*
 440          * Make mbuf data length reflect UDP length.  If not enough data to
 441          * reflect UDP length, drop.
 442          */
 443         len = ntohs((u_short)uh->uh_ulen);
 444         ip_len = ntohs(ip->ip_len) - iphlen;
 445         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 446                 /* Zero means checksum over the complete packet. */
 447                 if (len == 0)
 448                         len = ip_len;
 449                 cscov_partial = 0;
 450         }
 451         if (ip_len != len) {
 452                 if (len > ip_len || len < sizeof(struct udphdr)) {
 453                         UDPSTAT_INC(udps_badlen);
 454                         goto badunlocked;
 455                 }
 456                 if (proto == IPPROTO_UDP)
 457                         m_adj(m, len - ip_len);
 458         }
 459
 460         /*
 461          * Save a copy of the IP header in case we want restore it for
 462          * sending an ICMP error message in response.
 463          */
 464         if (!V_udp_blackhole)
 465                 save_ip = *ip;
 466         else
 467                 memset(&save_ip, 0, sizeof(save_ip));
 468
 469         /*
 470          * Checksum extended UDP header and data.
 471          */
 472         if (uh->uh_sum) {
 473                 u_short uh_sum;
 474
 475                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 476                     !cscov_partial) {
 477                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 478                                 uh_sum = m->m_pkthdr.csum_data;
 479                         else
 480                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 481                                     ip->ip_dst.s_addr, htonl((u_short)len +
 482                                     m->m_pkthdr.csum_data + proto));
 483                         uh_sum ^= 0xffff;
 484                 } else {
 485                         char b[9];
 486
 487                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 488                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 489                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 490                             uh->uh_ulen : htons(ip_len);
 491                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 492                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 493                 }
 494                 if (uh_sum) {
 495                         UDPSTAT_INC(udps_badsum);
 496                         m_freem(m);
 497                         return (IPPROTO_DONE);
 498                 }
 499         } else {
 500                 if (proto == IPPROTO_UDP) {
 501                         UDPSTAT_INC(udps_nosum);
 502                 } else {
 503                         /* UDPLite requires a checksum */
 504                         /* XXX: What is the right UDPLite MIB counter here? */
 505                         m_freem(m);
 506                         return (IPPROTO_DONE);
 507                 }
 508         }
 509
 510         pcbinfo = get_inpcbinfo(proto);
 511         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 512             in_broadcast(ip->ip_dst, ifp)) {
 513                 struct inpcb *last;
 514                 struct inpcbhead *pcblist;
 515                 struct ip_moptions *imo;
 516
 517                 INP_INFO_RLOCK(pcbinfo);
 518                 pcblist = get_pcblist(proto);
 519                 last = NULL;
 520                 LIST_FOREACH(inp, pcblist, inp_list) {
 521                         if (inp->inp_lport != uh->uh_dport)
 522                                 continue;
 523 #ifdef INET6
 524                         if ((inp->inp_vflag & INP_IPV4) == 0)
 525                                 continue;
 526 #endif
 527                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 528                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 529                                 continue;
 530                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 531                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 532                                 continue;
 533                         if (inp->inp_fport != 0 &&
 534                             inp->inp_fport != uh->uh_sport)
 535                                 continue;
 536
 537                         INP_RLOCK(inp);
 538
 539                         /*
 540                          * XXXRW: Because we weren't holding either the inpcb
 541                          * or the hash lock when we checked for a match
 542                          * before, we should probably recheck now that the
 543                          * inpcb lock is held.
 544                          */
 545
 546                         /*
 547                          * Handle socket delivery policy for any-source
 548                          * and source-specific multicast. [RFC3678]
 549                          */
 550                         imo = inp->inp_moptions;
 551                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 552                                 struct sockaddr_in       group;
 553                                 int                      blocked;
 554                                 if (imo == NULL) {
 555                                         INP_RUNLOCK(inp);
 556                                         continue;
 557                                 }
 558                                 bzero(&group, sizeof(struct sockaddr_in));
 559                                 group.sin_len = sizeof(struct sockaddr_in);
 560                                 group.sin_family = AF_INET;
 561                                 group.sin_addr = ip->ip_dst;
 562
 563                                 blocked = imo_multi_filter(imo, ifp,
 564                                         (struct sockaddr *)&group,
 565                                         (struct sockaddr *)&udp_in);
 566                                 if (blocked != MCAST_PASS) {
 567                                         if (blocked == MCAST_NOTGMEMBER)
 568                                                 IPSTAT_INC(ips_notmember);
 569                                         if (blocked == MCAST_NOTSMEMBER ||
 570                                             blocked == MCAST_MUTED)
 571                                                 UDPSTAT_INC(udps_filtermcast);
 572                                         INP_RUNLOCK(inp);
 573                                         continue;
 574                                 }
 575                         }
 576                         if (last != NULL) {
 577                                 struct mbuf *n;
 578
 579                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 580                                         UDP_PROBE(receive, NULL, last, ip,
 581                                             last, uh);
 582                                         udp_append(last, ip, n, iphlen,
 583                                             &udp_in);
 584                                 }
 585                                 INP_RUNLOCK(last);
 586                         }
 587                         last = inp;
 588                         /*
 589                          * Don't look for additional matches if this one does
 590                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 591                          * socket options set.  This heuristic avoids
 592                          * searching through all pcbs in the common case of a
 593                          * non-shared port.  It assumes that an application
 594                          * will never clear these options after setting them.
 595                          */
 596                         if ((last->inp_socket->so_options &
 597                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 598                                 break;
 599                 }
 600
 601                 if (last == NULL) {
 602                         /*
 603                          * No matching pcb found; discard datagram.  (No need
 604                          * to send an ICMP Port Unreachable for a broadcast
 605                          * or multicast datgram.)
 606                          */
 607                         UDPSTAT_INC(udps_noportbcast);
 608                         if (inp)
 609                                 INP_RUNLOCK(inp);
 610                         INP_INFO_RUNLOCK(pcbinfo);
 611                         goto badunlocked;
 612                 }
 613                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 614                 udp_append(last, ip, m, iphlen, &udp_in);
 615                 INP_RUNLOCK(last);
 616                 INP_INFO_RUNLOCK(pcbinfo);
 617                 return (IPPROTO_DONE);
 618         }
 619
 620         /*
 621          * Locate pcb for datagram.
 622          */
 623
 624         /*
 625          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 626          */
 627         if ((m->m_flags & M_IP_NEXTHOP) &&
 628             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 629                 struct sockaddr_in *next_hop;
 630
 631                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 632
 633                 /*
 634                  * Transparently forwarded. Pretend to be the destination.
 635                  * Already got one like this?
 636                  */
 637                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 638                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 639                 if (!inp) {
 640                         /*
 641                          * It's new.  Try to find the ambushing socket.
 642                          * Because we've rewritten the destination address,
 643                          * any hardware-generated hash is ignored.
 644                          */
 645                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 646                             uh->uh_sport, next_hop->sin_addr,
 647                             next_hop->sin_port ? htons(next_hop->sin_port) :
 648                             uh->uh_dport, INPLOOKUP_WILDCARD |
 649                             INPLOOKUP_RLOCKPCB, ifp);
 650                 }
 651                 /* Remove the tag from the packet. We don't need it anymore. */
 652                 m_tag_delete(m, fwd_tag);
 653                 m->m_flags &= ~M_IP_NEXTHOP;
 654         } else
 655                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 656                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 657                     INPLOOKUP_RLOCKPCB, ifp, m);
 658         if (inp == NULL) {
 659                 if (udp_log_in_vain) {
 660                         char buf[4*sizeof "123"];
 661
 662                         strcpy(buf, inet_ntoa(ip->ip_dst));
 663                         log(LOG_INFO,
 664                             "Connection attempt to UDP %s:%d from %s:%d\n",
 665                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 666                             ntohs(uh->uh_sport));
 667                 }
 668                 UDPSTAT_INC(udps_noport);
 669                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 670                         UDPSTAT_INC(udps_noportbcast);
 671                         goto badunlocked;
 672                 }
 673                 if (V_udp_blackhole)
 674                         goto badunlocked;
 675                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 676                         goto badunlocked;
 677                 *ip = save_ip;
 678                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 679                 return (IPPROTO_DONE);
 680         }
 681
 682         /*
 683          * Check the minimum TTL for socket.
 684          */
 685         INP_RLOCK_ASSERT(inp);
 686         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 687                 INP_RUNLOCK(inp);
 688                 m_freem(m);
 689                 return (IPPROTO_DONE);
 690         }
 691         if (cscov_partial) {
 692                 struct udpcb *up;
 693
 694                 up = intoudpcb(inp);
 695                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 696                         INP_RUNLOCK(inp);
 697                         m_freem(m);
 698                         return (IPPROTO_DONE);
 699                 }
 700         }
 701
 702         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 703         udp_append(inp, ip, m, iphlen, &udp_in);
 704         INP_RUNLOCK(inp);
 705         return (IPPROTO_DONE);
 706
 707 badunlocked:
 708         m_freem(m);
 709         return (IPPROTO_DONE);
 710 }
 711 #endif /* INET */
 712
 713 /*
 714  * Notify a udp user of an asynchronous error; just wake up so that they can
 715  * collect error status.
 716  */
 717 struct inpcb *
 718 udp_notify(struct inpcb *inp, int errno)
 719 {
 720
 721         /*
 722          * While udp_ctlinput() always calls udp_notify() with a read lock
 723          * when invoking it directly, in_pcbnotifyall() currently uses write
 724          * locks due to sharing code with TCP.  For now, accept either a read
 725          * or a write lock, but a read lock is sufficient.
 726          */
 727         INP_LOCK_ASSERT(inp);
 728
 729         inp->inp_socket->so_error = errno;
 730         sorwakeup(inp->inp_socket);
 731         sowwakeup(inp->inp_socket);
 732         return (inp);
 733 }
 734
 735 #ifdef INET
 736 static void
 737 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 738     struct inpcbinfo *pcbinfo)
 739 {
 740         struct ip *ip = vip;
 741         struct udphdr *uh;
 742         struct in_addr faddr;
 743         struct inpcb *inp;
 744
 745         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 746         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 747                 return;
 748
 749         /*
 750          * Redirects don't need to be handled up here.
 751          */
 752         if (PRC_IS_REDIRECT(cmd))
 753                 return;
 754
 755         /*
 756          * Hostdead is ugly because it goes linearly through all PCBs.
 757          *
 758          * XXX: We never get this from ICMP, otherwise it makes an excellent
 759          * DoS attack on machines with many connections.
 760          */
 761         if (cmd == PRC_HOSTDEAD)
 762                 ip = NULL;
 763         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 764                 return;
 765         if (ip != NULL) {
 766                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 767                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 768                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 769                 if (inp != NULL) {
 770                         INP_RLOCK_ASSERT(inp);
 771                         if (inp->inp_socket != NULL) {
 772                                 udp_notify(inp, inetctlerrmap[cmd]);
 773                         }
 774                         INP_RUNLOCK(inp);
 775                 }
 776         } else
 777                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 778                     udp_notify);
 779 }
 780 void
 781 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 782 {
 783
 784         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 785 }
 786
 787 void
 788 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 789 {
 790
 791         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 792 }
 793 #endif /* INET */
 794
 795 static int
 796 udp_pcblist(SYSCTL_HANDLER_ARGS)
 797 {
 798         int error, i, n;
 799         struct inpcb *inp, **inp_list;
 800         inp_gen_t gencnt;
 801         struct xinpgen xig;
 802
 803         /*
 804          * The process of preparing the PCB list is too time-consuming and
 805          * resource-intensive to repeat twice on every request.
 806          */
 807         if (req->oldptr == 0) {
 808                 n = V_udbinfo.ipi_count;
 809                 n += imax(n / 8, 10);
 810                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 811                 return (0);
 812         }
 813
 814         if (req->newptr != 0)
 815                 return (EPERM);
 816
 817         /*
 818          * OK, now we're committed to doing something.
 819          */
 820         INP_INFO_RLOCK(&V_udbinfo);
 821         gencnt = V_udbinfo.ipi_gencnt;
 822         n = V_udbinfo.ipi_count;
 823         INP_INFO_RUNLOCK(&V_udbinfo);
 824
 825         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 826                 + n * sizeof(struct xinpcb));
 827         if (error != 0)
 828                 return (error);
 829
 830         xig.xig_len = sizeof xig;
 831         xig.xig_count = n;
 832         xig.xig_gen = gencnt;
 833         xig.xig_sogen = so_gencnt;
 834         error = SYSCTL_OUT(req, &xig, sizeof xig);
 835         if (error)
 836                 return (error);
 837
 838         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 839         if (inp_list == 0)
 840                 return (ENOMEM);
 841
 842         INP_INFO_RLOCK(&V_udbinfo);
 843         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 844              inp = LIST_NEXT(inp, inp_list)) {
 845                 INP_WLOCK(inp);
 846                 if (inp->inp_gencnt <= gencnt &&
 847                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 848                         in_pcbref(inp);
 849                         inp_list[i++] = inp;
 850                 }
 851                 INP_WUNLOCK(inp);
 852         }
 853         INP_INFO_RUNLOCK(&V_udbinfo);
 854         n = i;
 855
 856         error = 0;
 857         for (i = 0; i < n; i++) {
 858                 inp = inp_list[i];
 859                 INP_RLOCK(inp);
 860                 if (inp->inp_gencnt <= gencnt) {
 861                         struct xinpcb xi;
 862
 863                         bzero(&xi, sizeof(xi));
 864                         xi.xi_len = sizeof xi;
 865                         /* XXX should avoid extra copy */
 866                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 867                         if (inp->inp_socket)
 868                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 869                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 870                         INP_RUNLOCK(inp);
 871                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 872                 } else
 873                         INP_RUNLOCK(inp);
 874         }
 875         INP_INFO_WLOCK(&V_udbinfo);
 876         for (i = 0; i < n; i++) {
 877                 inp = inp_list[i];
 878                 INP_RLOCK(inp);
 879                 if (!in_pcbrele_rlocked(inp))
 880                         INP_RUNLOCK(inp);
 881         }
 882         INP_INFO_WUNLOCK(&V_udbinfo);
 883
 884         if (!error) {
 885                 /*
 886                  * Give the user an updated idea of our state.  If the
 887                  * generation differs from what we told her before, she knows
 888                  * that something happened while we were processing this
 889                  * request, and it might be necessary to retry.
 890                  */
 891                 INP_INFO_RLOCK(&V_udbinfo);
 892                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 893                 xig.xig_sogen = so_gencnt;
 894                 xig.xig_count = V_udbinfo.ipi_count;
 895                 INP_INFO_RUNLOCK(&V_udbinfo);
 896                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 897         }
 898         free(inp_list, M_TEMP);
 899         return (error);
 900 }
 901
 902 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 903     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 904     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 905
 906 #ifdef INET
 907 static int
 908 udp_getcred(SYSCTL_HANDLER_ARGS)
 909 {
 910         struct xucred xuc;
 911         struct sockaddr_in addrs[2];
 912         struct inpcb *inp;
 913         int error;
 914
 915         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 916         if (error)
 917                 return (error);
 918         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 919         if (error)
 920                 return (error);
 921         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 922             addrs[0].sin_addr, addrs[0].sin_port,
 923             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 924         if (inp != NULL) {
 925                 INP_RLOCK_ASSERT(inp);
 926                 if (inp->inp_socket == NULL)
 927                         error = ENOENT;
 928                 if (error == 0)
 929                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 930                 if (error == 0)
 931                         cru2x(inp->inp_cred, &xuc);
 932                 INP_RUNLOCK(inp);
 933         } else
 934                 error = ENOENT;
 935         if (error == 0)
 936                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 937         return (error);
 938 }
 939
 940 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 941     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 942     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 943 #endif /* INET */
 944
 945 int
 946 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 947 {
 948         struct inpcb *inp;
 949         struct udpcb *up;
 950         int isudplite, error, optval;
 951
 952         error = 0;
 953         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 954         inp = sotoinpcb(so);
 955         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 956         INP_WLOCK(inp);
 957         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 958 #ifdef INET6
 959                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 960                         INP_WUNLOCK(inp);
 961                         error = ip6_ctloutput(so, sopt);
 962                 }
 963 #endif
 964 #if defined(INET) && defined(INET6)
 965                 else
 966 #endif
 967 #ifdef INET
 968                 {
 969                         INP_WUNLOCK(inp);
 970                         error = ip_ctloutput(so, sopt);
 971                 }
 972 #endif
 973                 return (error);
 974         }
 975
 976         switch (sopt->sopt_dir) {
 977         case SOPT_SET:
 978                 switch (sopt->sopt_name) {
 979                 case UDP_ENCAP:
 980                         INP_WUNLOCK(inp);
 981                         error = sooptcopyin(sopt, &optval, sizeof optval,
 982                                             sizeof optval);
 983                         if (error)
 984                                 break;
 985                         inp = sotoinpcb(so);
 986                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 987                         INP_WLOCK(inp);
 988 #ifdef IPSEC_NAT_T
 989                         up = intoudpcb(inp);
 990                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 991 #endif
 992                         switch (optval) {
 993                         case 0:
 994                                 /* Clear all UDP encap. */
 995 #ifdef IPSEC_NAT_T
 996                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 997 #endif
 998                                 break;
 999 #ifdef IPSEC_NAT_T
1000                         case UDP_ENCAP_ESPINUDP:
1001                         case UDP_ENCAP_ESPINUDP_NON_IKE:
1002                                 up->u_flags &= ~UF_ESPINUDP_ALL;
1003                                 if (optval == UDP_ENCAP_ESPINUDP)
1004                                         up->u_flags |= UF_ESPINUDP;
1005                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
1006                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
1007                                 break;
1008 #endif
1009                         default:
1010                                 error = EINVAL;
1011                                 break;
1012                         }
1013                         INP_WUNLOCK(inp);
1014                         break;
1015                 case UDPLITE_SEND_CSCOV:
1016                 case UDPLITE_RECV_CSCOV:
1017                         if (!isudplite) {
1018                                 INP_WUNLOCK(inp);
1019                                 error = ENOPROTOOPT;
1020                                 break;
1021                         }
1022                         INP_WUNLOCK(inp);
1023                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1024                             sizeof(optval));
1025                         if (error != 0)
1026                                 break;
1027                         inp = sotoinpcb(so);
1028                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1029                         INP_WLOCK(inp);
1030                         up = intoudpcb(inp);
1031                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1032                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1033                                 INP_WUNLOCK(inp);
1034                                 error = EINVAL;
1035                                 break;
1036                         }
1037                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1038                                 up->u_txcslen = optval;
1039                         else
1040                                 up->u_rxcslen = optval;
1041                         INP_WUNLOCK(inp);
1042                         break;
1043                 default:
1044                         INP_WUNLOCK(inp);
1045                         error = ENOPROTOOPT;
1046                         break;
1047                 }
1048                 break;
1049         case SOPT_GET:
1050                 switch (sopt->sopt_name) {
1051 #ifdef IPSEC_NAT_T
1052                 case UDP_ENCAP:
1053                         up = intoudpcb(inp);
1054                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1055                         optval = up->u_flags & UF_ESPINUDP_ALL;
1056                         INP_WUNLOCK(inp);
1057                         error = sooptcopyout(sopt, &optval, sizeof optval);
1058                         break;
1059 #endif
1060                 case UDPLITE_SEND_CSCOV:
1061                 case UDPLITE_RECV_CSCOV:
1062                         if (!isudplite) {
1063                                 INP_WUNLOCK(inp);
1064                                 error = ENOPROTOOPT;
1065                                 break;
1066                         }
1067                         up = intoudpcb(inp);
1068                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1069                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1070                                 optval = up->u_txcslen;
1071                         else
1072                                 optval = up->u_rxcslen;
1073                         INP_WUNLOCK(inp);
1074                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1075                         break;
1076                 default:
1077                         INP_WUNLOCK(inp);
1078                         error = ENOPROTOOPT;
1079                         break;
1080                 }
1081                 break;
1082         }
1083         return (error);
1084 }
1085
1086 #ifdef INET
1087 #define UH_WLOCKED      2
1088 #define UH_RLOCKED      1
1089 #define UH_UNLOCKED     0
1090 static int
1091 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1092     struct mbuf *control, struct thread *td)
1093 {
1094         struct udpiphdr *ui;
1095         int len = m->m_pkthdr.len;
1096         struct in_addr faddr, laddr;
1097         struct cmsghdr *cm;
1098         struct inpcbinfo *pcbinfo;
1099         struct sockaddr_in *sin, src;
1100         int cscov_partial = 0;
1101         int error = 0;
1102         int ipflags;
1103         u_short fport, lport;
1104         int unlock_udbinfo;
1105         u_char tos;
1106         uint8_t pr;
1107         uint16_t cscov = 0;
1108         uint32_t flowid = 0;
1109         uint8_t flowtype = M_HASHTYPE_NONE;
1110
1111         /*
1112          * udp_output() may need to temporarily bind or connect the current
1113          * inpcb.  As such, we don't know up front whether we will need the
1114          * pcbinfo lock or not.  Do any work to decide what is needed up
1115          * front before acquiring any locks.
1116          */
1117         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1118                 if (control)
1119                         m_freem(control);
1120                 m_freem(m);
1121                 return (EMSGSIZE);
1122         }
1123
1124         src.sin_family = 0;
1125         INP_RLOCK(inp);
1126         tos = inp->inp_ip_tos;
1127         if (control != NULL) {
1128                 /*
1129                  * XXX: Currently, we assume all the optional information is
1130                  * stored in a single mbuf.
1131                  */
1132                 if (control->m_next) {
1133                         INP_RUNLOCK(inp);
1134                         m_freem(control);
1135                         m_freem(m);
1136                         return (EINVAL);
1137                 }
1138                 for (; control->m_len > 0;
1139                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1140                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1141                         cm = mtod(control, struct cmsghdr *);
1142                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1143                             || cm->cmsg_len > control->m_len) {
1144                                 error = EINVAL;
1145                                 break;
1146                         }
1147                         if (cm->cmsg_level != IPPROTO_IP)
1148                                 continue;
1149
1150                         switch (cm->cmsg_type) {
1151                         case IP_SENDSRCADDR:
1152                                 if (cm->cmsg_len !=
1153                                     CMSG_LEN(sizeof(struct in_addr))) {
1154                                         error = EINVAL;
1155                                         break;
1156                                 }
1157                                 bzero(&src, sizeof(src));
1158                                 src.sin_family = AF_INET;
1159                                 src.sin_len = sizeof(src);
1160                                 src.sin_port = inp->inp_lport;
1161                                 src.sin_addr =
1162                                     *(struct in_addr *)CMSG_DATA(cm);
1163                                 break;
1164
1165                         case IP_TOS:
1166                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1167                                         error = EINVAL;
1168                                         break;
1169                                 }
1170                                 tos = *(u_char *)CMSG_DATA(cm);
1171                                 break;
1172
1173                         case IP_FLOWID:
1174                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1175                                         error = EINVAL;
1176                                         break;
1177                                 }
1178                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1179                                 break;
1180
1181                         case IP_FLOWTYPE:
1182                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1183                                         error = EINVAL;
1184                                         break;
1185                                 }
1186                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1187                                 break;
1188
1189 #ifdef  RSS
1190                         case IP_RSSBUCKETID:
1191                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1192                                         error = EINVAL;
1193                                         break;
1194                                 }
1195                                 /* This is just a placeholder for now */
1196                                 break;
1197 #endif  /* RSS */
1198                         default:
1199                                 error = ENOPROTOOPT;
1200                                 break;
1201                         }
1202                         if (error)
1203                                 break;
1204                 }
1205                 m_freem(control);
1206         }
1207         if (error) {
1208                 INP_RUNLOCK(inp);
1209                 m_freem(m);
1210                 return (error);
1211         }
1212
1213         /*
1214          * Depending on whether or not the application has bound or connected
1215          * the socket, we may have to do varying levels of work.  The optimal
1216          * case is for a connected UDP socket, as a global lock isn't
1217          * required at all.
1218          *
1219          * In order to decide which we need, we require stability of the
1220          * inpcb binding, which we ensure by acquiring a read lock on the
1221          * inpcb.  This doesn't strictly follow the lock order, so we play
1222          * the trylock and retry game; note that we may end up with more
1223          * conservative locks than required the second time around, so later
1224          * assertions have to accept that.  Further analysis of the number of
1225          * misses under contention is required.
1226          *
1227          * XXXRW: Check that hash locking update here is correct.
1228          */
1229         pr = inp->inp_socket->so_proto->pr_protocol;
1230         pcbinfo = get_inpcbinfo(pr);
1231         sin = (struct sockaddr_in *)addr;
1232         if (sin != NULL &&
1233             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1234                 INP_RUNLOCK(inp);
1235                 INP_WLOCK(inp);
1236                 INP_HASH_WLOCK(pcbinfo);
1237                 unlock_udbinfo = UH_WLOCKED;
1238         } else if ((sin != NULL && (
1239             (sin->sin_addr.s_addr == INADDR_ANY) ||
1240             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1241             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1242             (inp->inp_lport == 0))) ||
1243             (src.sin_family == AF_INET)) {
1244                 INP_HASH_RLOCK(pcbinfo);
1245                 unlock_udbinfo = UH_RLOCKED;
1246         } else
1247                 unlock_udbinfo = UH_UNLOCKED;
1248
1249         /*
1250          * If the IP_SENDSRCADDR control message was specified, override the
1251          * source address for this datagram.  Its use is invalidated if the
1252          * address thus specified is incomplete or clobbers other inpcbs.
1253          */
1254         laddr = inp->inp_laddr;
1255         lport = inp->inp_lport;
1256         if (src.sin_family == AF_INET) {
1257                 INP_HASH_LOCK_ASSERT(pcbinfo);
1258                 if ((lport == 0) ||
1259                     (laddr.s_addr == INADDR_ANY &&
1260                      src.sin_addr.s_addr == INADDR_ANY)) {
1261                         error = EINVAL;
1262                         goto release;
1263                 }
1264                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1265                     &laddr.s_addr, &lport, td->td_ucred);
1266                 if (error)
1267                         goto release;
1268         }
1269
1270         /*
1271          * If a UDP socket has been connected, then a local address/port will
1272          * have been selected and bound.
1273          *
1274          * If a UDP socket has not been connected to, then an explicit
1275          * destination address must be used, in which case a local
1276          * address/port may not have been selected and bound.
1277          */
1278         if (sin != NULL) {
1279                 INP_LOCK_ASSERT(inp);
1280                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1281                         error = EISCONN;
1282                         goto release;
1283                 }
1284
1285                 /*
1286                  * Jail may rewrite the destination address, so let it do
1287                  * that before we use it.
1288                  */
1289                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1290                 if (error)
1291                         goto release;
1292
1293                 /*
1294                  * If a local address or port hasn't yet been selected, or if
1295                  * the destination address needs to be rewritten due to using
1296                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1297                  * to do the heavy lifting.  Once a port is selected, we
1298                  * commit the binding back to the socket; we also commit the
1299                  * binding of the address if in jail.
1300                  *
1301                  * If we already have a valid binding and we're not
1302                  * requesting a destination address rewrite, use a fast path.
1303                  */
1304                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1305                     inp->inp_lport == 0 ||
1306                     sin->sin_addr.s_addr == INADDR_ANY ||
1307                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1308                         INP_HASH_LOCK_ASSERT(pcbinfo);
1309                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1310                             &lport, &faddr.s_addr, &fport, NULL,
1311                             td->td_ucred);
1312                         if (error)
1313                                 goto release;
1314
1315                         /*
1316                          * XXXRW: Why not commit the port if the address is
1317                          * !INADDR_ANY?
1318                          */
1319                         /* Commit the local port if newly assigned. */
1320                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1321                             inp->inp_lport == 0) {
1322                                 INP_WLOCK_ASSERT(inp);
1323                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1324                                 /*
1325                                  * Remember addr if jailed, to prevent
1326                                  * rebinding.
1327                                  */
1328                                 if (prison_flag(td->td_ucred, PR_IP4))
1329                                         inp->inp_laddr = laddr;
1330                                 inp->inp_lport = lport;
1331                                 if (in_pcbinshash(inp) != 0) {
1332                                         inp->inp_lport = 0;
1333                                         error = EAGAIN;
1334                                         goto release;
1335                                 }
1336                                 inp->inp_flags |= INP_ANONPORT;
1337                         }
1338                 } else {
1339                         faddr = sin->sin_addr;
1340                         fport = sin->sin_port;
1341                 }
1342         } else {
1343                 INP_LOCK_ASSERT(inp);
1344                 faddr = inp->inp_faddr;
1345                 fport = inp->inp_fport;
1346                 if (faddr.s_addr == INADDR_ANY) {
1347                         error = ENOTCONN;
1348                         goto release;
1349                 }
1350         }
1351
1352         /*
1353          * Calculate data length and get a mbuf for UDP, IP, and possible
1354          * link-layer headers.  Immediate slide the data pointer back forward
1355          * since we won't use that space at this layer.
1356          */
1357         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1358         if (m == NULL) {
1359                 error = ENOBUFS;
1360                 goto release;
1361         }
1362         m->m_data += max_linkhdr;
1363         m->m_len -= max_linkhdr;
1364         m->m_pkthdr.len -= max_linkhdr;
1365
1366         /*
1367          * Fill in mbuf with extended UDP header and addresses and length put
1368          * into network format.
1369          */
1370         ui = mtod(m, struct udpiphdr *);
1371         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1372         ui->ui_pr = pr;
1373         ui->ui_src = laddr;
1374         ui->ui_dst = faddr;
1375         ui->ui_sport = lport;
1376         ui->ui_dport = fport;
1377         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1378         if (pr == IPPROTO_UDPLITE) {
1379                 struct udpcb *up;
1380                 uint16_t plen;
1381
1382                 up = intoudpcb(inp);
1383                 cscov = up->u_txcslen;
1384                 plen = (u_short)len + sizeof(struct udphdr);
1385                 if (cscov >= plen)
1386                         cscov = 0;
1387                 ui->ui_len = htons(plen);
1388                 ui->ui_ulen = htons(cscov);
1389                 /*
1390                  * For UDP-Lite, checksum coverage length of zero means
1391                  * the entire UDPLite packet is covered by the checksum.
1392                  */
1393                 cscov_partial = (cscov == 0) ? 0 : 1;
1394         } else
1395                 ui->ui_v = IPVERSION << 4;
1396
1397         /*
1398          * Set the Don't Fragment bit in the IP header.
1399          */
1400         if (inp->inp_flags & INP_DONTFRAG) {
1401                 struct ip *ip;
1402
1403                 ip = (struct ip *)&ui->ui_i;
1404                 ip->ip_off |= htons(IP_DF);
1405         }
1406
1407         ipflags = 0;
1408         if (inp->inp_socket->so_options & SO_DONTROUTE)
1409                 ipflags |= IP_ROUTETOIF;
1410         if (inp->inp_socket->so_options & SO_BROADCAST)
1411                 ipflags |= IP_ALLOWBROADCAST;
1412         if (inp->inp_flags & INP_ONESBCAST)
1413                 ipflags |= IP_SENDONES;
1414
1415 #ifdef MAC
1416         mac_inpcb_create_mbuf(inp, m);
1417 #endif
1418
1419         /*
1420          * Set up checksum and output datagram.
1421          */
1422         ui->ui_sum = 0;
1423         if (pr == IPPROTO_UDPLITE) {
1424                 if (inp->inp_flags & INP_ONESBCAST)
1425                         faddr.s_addr = INADDR_BROADCAST;
1426                 if (cscov_partial) {
1427                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1428                                 ui->ui_sum = 0xffff;
1429                 } else {
1430                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1431                                 ui->ui_sum = 0xffff;
1432                 }
1433         } else if (V_udp_cksum) {
1434                 if (inp->inp_flags & INP_ONESBCAST)
1435                         faddr.s_addr = INADDR_BROADCAST;
1436                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1437                     htons((u_short)len + sizeof(struct udphdr) + pr));
1438                 m->m_pkthdr.csum_flags = CSUM_UDP;
1439                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1440         }
1441         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1442         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1443         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1444         UDPSTAT_INC(udps_opackets);
1445
1446         /*
1447          * Setup flowid / RSS information for outbound socket.
1448          *
1449          * Once the UDP code decides to set a flowid some other way,
1450          * this allows the flowid to be overridden by userland.
1451          */
1452         if (flowtype != M_HASHTYPE_NONE) {
1453                 m->m_pkthdr.flowid = flowid;
1454                 M_HASHTYPE_SET(m, flowtype);
1455 #ifdef  RSS
1456         } else {
1457                 uint32_t hash_val, hash_type;
1458                 /*
1459                  * Calculate an appropriate RSS hash for UDP and
1460                  * UDP Lite.
1461                  *
1462                  * The called function will take care of figuring out
1463                  * whether a 2-tuple or 4-tuple hash is required based
1464                  * on the currently configured scheme.
1465                  *
1466                  * Later later on connected socket values should be
1467                  * cached in the inpcb and reused, rather than constantly
1468                  * re-calculating it.
1469                  *
1470                  * UDP Lite is a different protocol number and will
1471                  * likely end up being hashed as a 2-tuple until
1472                  * RSS / NICs grow UDP Lite protocol awareness.
1473                  */
1474                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1475                     pr, &hash_val, &hash_type) == 0) {
1476                         m->m_pkthdr.flowid = hash_val;
1477                         M_HASHTYPE_SET(m, hash_type);
1478                 }
1479 #endif
1480         }
1481
1482 #ifdef  RSS
1483         /*
1484          * Don't override with the inp cached flowid value.
1485          *
1486          * Depending upon the kind of send being done, the inp
1487          * flowid/flowtype values may actually not be appropriate
1488          * for this particular socket send.
1489          *
1490          * We should either leave the flowid at zero (which is what is
1491          * currently done) or set it to some software generated
1492          * hash value based on the packet contents.
1493          */
1494         ipflags |= IP_NODEFAULTFLOWID;
1495 #endif  /* RSS */
1496
1497         if (unlock_udbinfo == UH_WLOCKED)
1498                 INP_HASH_WUNLOCK(pcbinfo);
1499         else if (unlock_udbinfo == UH_RLOCKED)
1500                 INP_HASH_RUNLOCK(pcbinfo);
1501         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1502         error = ip_output(m, inp->inp_options, NULL, ipflags,
1503             inp->inp_moptions, inp);
1504         if (unlock_udbinfo == UH_WLOCKED)
1505                 INP_WUNLOCK(inp);
1506         else
1507                 INP_RUNLOCK(inp);
1508         return (error);
1509
1510 release:
1511         if (unlock_udbinfo == UH_WLOCKED) {
1512                 INP_HASH_WUNLOCK(pcbinfo);
1513                 INP_WUNLOCK(inp);
1514         } else if (unlock_udbinfo == UH_RLOCKED) {
1515                 INP_HASH_RUNLOCK(pcbinfo);
1516                 INP_RUNLOCK(inp);
1517         } else
1518                 INP_RUNLOCK(inp);
1519         m_freem(m);
1520         return (error);
1521 }
1522
1523
1524 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1525 /*
1526  * Potentially decap ESP in UDP frame.  Check for an ESP header
1527  * and optional marker; if present, strip the UDP header and
1528  * push the result through IPSec.
1529  *
1530  * Returns mbuf to be processed (potentially re-allocated) or
1531  * NULL if consumed and/or processed.
1532  */
1533 static struct mbuf *
1534 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1535 {
1536         size_t minlen, payload, skip, iphlen;
1537         caddr_t data;
1538         struct udpcb *up;
1539         struct m_tag *tag;
1540         struct udphdr *udphdr;
1541         struct ip *ip;
1542
1543         INP_RLOCK_ASSERT(inp);
1544
1545         /*
1546          * Pull up data so the longest case is contiguous:
1547          *    IP/UDP hdr + non ESP marker + ESP hdr.
1548          */
1549         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1550         if (minlen > m->m_pkthdr.len)
1551                 minlen = m->m_pkthdr.len;
1552         if ((m = m_pullup(m, minlen)) == NULL) {
1553                 IPSECSTAT_INC(ips_in_inval);
1554                 return (NULL);          /* Bypass caller processing. */
1555         }
1556         data = mtod(m, caddr_t);        /* Points to ip header. */
1557         payload = m->m_len - off;       /* Size of payload. */
1558
1559         if (payload == 1 && data[off] == '\xff')
1560                 return (m);             /* NB: keepalive packet, no decap. */
1561
1562         up = intoudpcb(inp);
1563         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1564         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1565             ("u_flags 0x%x", up->u_flags));
1566
1567         /*
1568          * Check that the payload is large enough to hold an
1569          * ESP header and compute the amount of data to remove.
1570          *
1571          * NB: the caller has already done a pullup for us.
1572          * XXX can we assume alignment and eliminate bcopys?
1573          */
1574         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1575                 /*
1576                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1577                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1578                  * possible AH mode non-IKE marker+non-ESP marker
1579                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1580                  */
1581                 uint64_t marker;
1582
1583                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1584                         return (m);     /* NB: no decap. */
1585                 bcopy(data + off, &marker, sizeof(uint64_t));
1586                 if (marker != 0)        /* Non-IKE marker. */
1587                         return (m);     /* NB: no decap. */
1588                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1589         } else {
1590                 uint32_t spi;
1591
1592                 if (payload <= sizeof(struct esp)) {
1593                         IPSECSTAT_INC(ips_in_inval);
1594                         m_freem(m);
1595                         return (NULL);  /* Discard. */
1596                 }
1597                 bcopy(data + off, &spi, sizeof(uint32_t));
1598                 if (spi == 0)           /* Non-ESP marker. */
1599                         return (m);     /* NB: no decap. */
1600                 skip = sizeof(struct udphdr);
1601         }
1602
1603         /*
1604          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1605          * the UDP ports. This is required if we want to select
1606          * the right SPD for multiple hosts behind same NAT.
1607          *
1608          * NB: ports are maintained in network byte order everywhere
1609          *     in the NAT-T code.
1610          */
1611         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1612                 2 * sizeof(uint16_t), M_NOWAIT);
1613         if (tag == NULL) {
1614                 IPSECSTAT_INC(ips_in_nomem);
1615                 m_freem(m);
1616                 return (NULL);          /* Discard. */
1617         }
1618         iphlen = off - sizeof(struct udphdr);
1619         udphdr = (struct udphdr *)(data + iphlen);
1620         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1621         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1622         m_tag_prepend(m, tag);
1623
1624         /*
1625          * Remove the UDP header (and possibly the non ESP marker)
1626          * IP header length is iphlen
1627          * Before:
1628          *   <--- off --->
1629          *   +----+------+-----+
1630          *   | IP |  UDP | ESP |
1631          *   +----+------+-----+
1632          *        <-skip->
1633          * After:
1634          *          +----+-----+
1635          *          | IP | ESP |
1636          *          +----+-----+
1637          *   <-skip->
1638          */
1639         ovbcopy(data, data + skip, iphlen);
1640         m_adj(m, skip);
1641
1642         ip = mtod(m, struct ip *);
1643         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1644         ip->ip_p = IPPROTO_ESP;
1645
1646         /*
1647          * We cannot yet update the cksums so clear any
1648          * h/w cksum flags as they are no longer valid.
1649          */
1650         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1651                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1652
1653         (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1654         return (NULL);                  /* NB: consumed, bypass processing. */
1655 }
1656 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1657
1658 static void
1659 udp_abort(struct socket *so)
1660 {
1661         struct inpcb *inp;
1662         struct inpcbinfo *pcbinfo;
1663
1664         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1665         inp = sotoinpcb(so);
1666         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1667         INP_WLOCK(inp);
1668         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1669                 INP_HASH_WLOCK(pcbinfo);
1670                 in_pcbdisconnect(inp);
1671                 inp->inp_laddr.s_addr = INADDR_ANY;
1672                 INP_HASH_WUNLOCK(pcbinfo);
1673                 soisdisconnected(so);
1674         }
1675         INP_WUNLOCK(inp);
1676 }
1677
1678 static int
1679 udp_attach(struct socket *so, int proto, struct thread *td)
1680 {
1681         struct inpcb *inp;
1682         struct inpcbinfo *pcbinfo;
1683         int error;
1684
1685         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1686         inp = sotoinpcb(so);
1687         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1688         error = soreserve(so, udp_sendspace, udp_recvspace);
1689         if (error)
1690                 return (error);
1691         INP_INFO_WLOCK(pcbinfo);
1692         error = in_pcballoc(so, pcbinfo);
1693         if (error) {
1694                 INP_INFO_WUNLOCK(pcbinfo);
1695                 return (error);
1696         }
1697
1698         inp = sotoinpcb(so);
1699         inp->inp_vflag |= INP_IPV4;
1700         inp->inp_ip_ttl = V_ip_defttl;
1701
1702         error = udp_newudpcb(inp);
1703         if (error) {
1704                 in_pcbdetach(inp);
1705                 in_pcbfree(inp);
1706                 INP_INFO_WUNLOCK(pcbinfo);
1707                 return (error);
1708         }
1709
1710         INP_WUNLOCK(inp);
1711         INP_INFO_WUNLOCK(pcbinfo);
1712         return (0);
1713 }
1714 #endif /* INET */
1715
1716 int
1717 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, void *ctx)
1718 {
1719         struct inpcb *inp;
1720         struct udpcb *up;
1721
1722         KASSERT(so->so_type == SOCK_DGRAM,
1723             ("udp_set_kernel_tunneling: !dgram"));
1724         inp = sotoinpcb(so);
1725         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1726         INP_WLOCK(inp);
1727         up = intoudpcb(inp);
1728         if (up->u_tun_func != NULL) {
1729                 INP_WUNLOCK(inp);
1730                 return (EBUSY);
1731         }
1732         up->u_tun_func = f;
1733         up->u_tun_ctx = ctx;
1734         INP_WUNLOCK(inp);
1735         return (0);
1736 }
1737
1738 #ifdef INET
1739 static int
1740 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1741 {
1742         struct inpcb *inp;
1743         struct inpcbinfo *pcbinfo;
1744         int error;
1745
1746         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1747         inp = sotoinpcb(so);
1748         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1749         INP_WLOCK(inp);
1750         INP_HASH_WLOCK(pcbinfo);
1751         error = in_pcbbind(inp, nam, td->td_ucred);
1752         INP_HASH_WUNLOCK(pcbinfo);
1753         INP_WUNLOCK(inp);
1754         return (error);
1755 }
1756
1757 static void
1758 udp_close(struct socket *so)
1759 {
1760         struct inpcb *inp;
1761         struct inpcbinfo *pcbinfo;
1762
1763         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1764         inp = sotoinpcb(so);
1765         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1766         INP_WLOCK(inp);
1767         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1768                 INP_HASH_WLOCK(pcbinfo);
1769                 in_pcbdisconnect(inp);
1770                 inp->inp_laddr.s_addr = INADDR_ANY;
1771                 INP_HASH_WUNLOCK(pcbinfo);
1772                 soisdisconnected(so);
1773         }
1774         INP_WUNLOCK(inp);
1775 }
1776
1777 static int
1778 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1779 {
1780         struct inpcb *inp;
1781         struct inpcbinfo *pcbinfo;
1782         struct sockaddr_in *sin;
1783         int error;
1784
1785         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1786         inp = sotoinpcb(so);
1787         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1788         INP_WLOCK(inp);
1789         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1790                 INP_WUNLOCK(inp);
1791                 return (EISCONN);
1792         }
1793         sin = (struct sockaddr_in *)nam;
1794         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1795         if (error != 0) {
1796                 INP_WUNLOCK(inp);
1797                 return (error);
1798         }
1799         INP_HASH_WLOCK(pcbinfo);
1800         error = in_pcbconnect(inp, nam, td->td_ucred);
1801         INP_HASH_WUNLOCK(pcbinfo);
1802         if (error == 0)
1803                 soisconnected(so);
1804         INP_WUNLOCK(inp);
1805         return (error);
1806 }
1807
1808 static void
1809 udp_detach(struct socket *so)
1810 {
1811         struct inpcb *inp;
1812         struct inpcbinfo *pcbinfo;
1813         struct udpcb *up;
1814
1815         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1816         inp = sotoinpcb(so);
1817         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1818         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1819             ("udp_detach: not disconnected"));
1820         INP_INFO_WLOCK(pcbinfo);
1821         INP_WLOCK(inp);
1822         up = intoudpcb(inp);
1823         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1824         inp->inp_ppcb = NULL;
1825         in_pcbdetach(inp);
1826         in_pcbfree(inp);
1827         INP_INFO_WUNLOCK(pcbinfo);
1828         udp_discardcb(up);
1829 }
1830
1831 static int
1832 udp_disconnect(struct socket *so)
1833 {
1834         struct inpcb *inp;
1835         struct inpcbinfo *pcbinfo;
1836
1837         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1838         inp = sotoinpcb(so);
1839         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1840         INP_WLOCK(inp);
1841         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1842                 INP_WUNLOCK(inp);
1843                 return (ENOTCONN);
1844         }
1845         INP_HASH_WLOCK(pcbinfo);
1846         in_pcbdisconnect(inp);
1847         inp->inp_laddr.s_addr = INADDR_ANY;
1848         INP_HASH_WUNLOCK(pcbinfo);
1849         SOCK_LOCK(so);
1850         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1851         SOCK_UNLOCK(so);
1852         INP_WUNLOCK(inp);
1853         return (0);
1854 }
1855
1856 static int
1857 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1858     struct mbuf *control, struct thread *td)
1859 {
1860         struct inpcb *inp;
1861
1862         inp = sotoinpcb(so);
1863         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1864         return (udp_output(inp, m, addr, control, td));
1865 }
1866 #endif /* INET */
1867
1868 int
1869 udp_shutdown(struct socket *so)
1870 {
1871         struct inpcb *inp;
1872
1873         inp = sotoinpcb(so);
1874         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1875         INP_WLOCK(inp);
1876         socantsendmore(so);
1877         INP_WUNLOCK(inp);
1878         return (0);
1879 }
1880
1881 #ifdef INET
1882 struct pr_usrreqs udp_usrreqs = {
1883         .pru_abort =            udp_abort,
1884         .pru_attach =           udp_attach,
1885         .pru_bind =             udp_bind,
1886         .pru_connect =          udp_connect,
1887         .pru_control =          in_control,
1888         .pru_detach =           udp_detach,
1889         .pru_disconnect =       udp_disconnect,
1890         .pru_peeraddr =         in_getpeeraddr,
1891         .pru_send =             udp_send,
1892         .pru_soreceive =        soreceive_dgram,
1893         .pru_sosend =           sosend_dgram,
1894         .pru_shutdown =         udp_shutdown,
1895         .pru_sockaddr =         in_getsockaddr,
1896         .pru_sosetlabel =       in_pcbsosetlabel,
1897         .pru_close =            udp_close,
1898 };
1899 #endif /* INET */