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_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, 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_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, 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, UMA_ZONE_NOFREE,
 220             IPI_HASHFIELDS_2TUPLE);
 221         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 222             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 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             UMA_ZONE_NOFREE, 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);
 316                 return;
 317         }
 318
 319         if (n == NULL)
 320                 return;
 321
 322         off += sizeof(struct udphdr);
 323
 324 #ifdef IPSEC
 325         /* Check AH/ESP integrity. */
 326         if (ipsec4_in_reject(n, inp)) {
 327                 m_freem(n);
 328                 IPSECSTAT_INC(ips_in_polvio);
 329                 return;
 330         }
 331 #ifdef IPSEC_NAT_T
 332         up = intoudpcb(inp);
 333         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 334         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 335                 n = udp4_espdecap(inp, n, off);
 336                 if (n == NULL)                          /* Consumed. */
 337                         return;
 338         }
 339 #endif /* IPSEC_NAT_T */
 340 #endif /* IPSEC */
 341 #ifdef MAC
 342         if (mac_inpcb_check_deliver(inp, n) != 0) {
 343                 m_freem(n);
 344                 return;
 345         }
 346 #endif /* MAC */
 347         if (inp->inp_flags & INP_CONTROLOPTS ||
 348             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 349 #ifdef INET6
 350                 if (inp->inp_vflag & INP_IPV6)
 351                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 352                 else
 353 #endif /* INET6 */
 354                         ip_savecontrol(inp, &opts, ip, n);
 355         }
 356 #ifdef INET6
 357         if (inp->inp_vflag & INP_IPV6) {
 358                 bzero(&udp_in6, sizeof(udp_in6));
 359                 udp_in6.sin6_len = sizeof(udp_in6);
 360                 udp_in6.sin6_family = AF_INET6;
 361                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 362                 append_sa = (struct sockaddr *)&udp_in6;
 363         } else
 364 #endif /* INET6 */
 365                 append_sa = (struct sockaddr *)udp_in;
 366         m_adj(n, off);
 367
 368         so = inp->inp_socket;
 369         SOCKBUF_LOCK(&so->so_rcv);
 370         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 371                 SOCKBUF_UNLOCK(&so->so_rcv);
 372                 m_freem(n);
 373                 if (opts)
 374                         m_freem(opts);
 375                 UDPSTAT_INC(udps_fullsock);
 376         } else
 377                 sorwakeup_locked(so);
 378 }
 379
 380 int
 381 udp_input(struct mbuf **mp, int *offp, int proto)
 382 {
 383         struct ip *ip;
 384         struct udphdr *uh;
 385         struct ifnet *ifp;
 386         struct inpcb *inp;
 387         uint16_t len, ip_len;
 388         struct inpcbinfo *pcbinfo;
 389         struct ip save_ip;
 390         struct sockaddr_in udp_in;
 391         struct mbuf *m;
 392         struct m_tag *fwd_tag;
 393         int cscov_partial, iphlen;
 394
 395         m = *mp;
 396         iphlen = *offp;
 397         ifp = m->m_pkthdr.rcvif;
 398         *mp = NULL;
 399         UDPSTAT_INC(udps_ipackets);
 400
 401         /*
 402          * Strip IP options, if any; should skip this, make available to
 403          * user, and use on returned packets, but we don't yet have a way to
 404          * check the checksum with options still present.
 405          */
 406         if (iphlen > sizeof (struct ip)) {
 407                 ip_stripoptions(m);
 408                 iphlen = sizeof(struct ip);
 409         }
 410
 411         /*
 412          * Get IP and UDP header together in first mbuf.
 413          */
 414         ip = mtod(m, struct ip *);
 415         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 416                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 417                         UDPSTAT_INC(udps_hdrops);
 418                         return (IPPROTO_DONE);
 419                 }
 420                 ip = mtod(m, struct ip *);
 421         }
 422         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 423         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 424
 425         /*
 426          * Destination port of 0 is illegal, based on RFC768.
 427          */
 428         if (uh->uh_dport == 0)
 429                 goto badunlocked;
 430
 431         /*
 432          * Construct sockaddr format source address.  Stuff source address
 433          * and datagram in user buffer.
 434          */
 435         bzero(&udp_in, sizeof(udp_in));
 436         udp_in.sin_len = sizeof(udp_in);
 437         udp_in.sin_family = AF_INET;
 438         udp_in.sin_port = uh->uh_sport;
 439         udp_in.sin_addr = ip->ip_src;
 440
 441         /*
 442          * Make mbuf data length reflect UDP length.  If not enough data to
 443          * reflect UDP length, drop.
 444          */
 445         len = ntohs((u_short)uh->uh_ulen);
 446         ip_len = ntohs(ip->ip_len) - iphlen;
 447         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 448                 /* Zero means checksum over the complete packet. */
 449                 if (len == 0)
 450                         len = ip_len;
 451                 cscov_partial = 0;
 452         }
 453         if (ip_len != len) {
 454                 if (len > ip_len || len < sizeof(struct udphdr)) {
 455                         UDPSTAT_INC(udps_badlen);
 456                         goto badunlocked;
 457                 }
 458                 if (proto == IPPROTO_UDP)
 459                         m_adj(m, len - ip_len);
 460         }
 461
 462         /*
 463          * Save a copy of the IP header in case we want restore it for
 464          * sending an ICMP error message in response.
 465          */
 466         if (!V_udp_blackhole)
 467                 save_ip = *ip;
 468         else
 469                 memset(&save_ip, 0, sizeof(save_ip));
 470
 471         /*
 472          * Checksum extended UDP header and data.
 473          */
 474         if (uh->uh_sum) {
 475                 u_short uh_sum;
 476
 477                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 478                     !cscov_partial) {
 479                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 480                                 uh_sum = m->m_pkthdr.csum_data;
 481                         else
 482                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 483                                     ip->ip_dst.s_addr, htonl((u_short)len +
 484                                     m->m_pkthdr.csum_data + proto));
 485                         uh_sum ^= 0xffff;
 486                 } else {
 487                         char b[9];
 488
 489                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 490                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 491                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 492                             uh->uh_ulen : htons(ip_len);
 493                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 494                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 495                 }
 496                 if (uh_sum) {
 497                         UDPSTAT_INC(udps_badsum);
 498                         m_freem(m);
 499                         return (IPPROTO_DONE);
 500                 }
 501         } else {
 502                 if (proto == IPPROTO_UDP) {
 503                         UDPSTAT_INC(udps_nosum);
 504                 } else {
 505                         /* UDPLite requires a checksum */
 506                         /* XXX: What is the right UDPLite MIB counter here? */
 507                         m_freem(m);
 508                         return (IPPROTO_DONE);
 509                 }
 510         }
 511
 512         pcbinfo = get_inpcbinfo(proto);
 513         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 514             in_broadcast(ip->ip_dst, ifp)) {
 515                 struct inpcb *last;
 516                 struct inpcbhead *pcblist;
 517                 struct ip_moptions *imo;
 518
 519                 INP_INFO_RLOCK(pcbinfo);
 520                 pcblist = get_pcblist(proto);
 521                 last = NULL;
 522                 LIST_FOREACH(inp, pcblist, inp_list) {
 523                         if (inp->inp_lport != uh->uh_dport)
 524                                 continue;
 525 #ifdef INET6
 526                         if ((inp->inp_vflag & INP_IPV4) == 0)
 527                                 continue;
 528 #endif
 529                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 530                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 531                                 continue;
 532                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 533                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 534                                 continue;
 535                         if (inp->inp_fport != 0 &&
 536                             inp->inp_fport != uh->uh_sport)
 537                                 continue;
 538
 539                         INP_RLOCK(inp);
 540
 541                         /*
 542                          * XXXRW: Because we weren't holding either the inpcb
 543                          * or the hash lock when we checked for a match
 544                          * before, we should probably recheck now that the
 545                          * inpcb lock is held.
 546                          */
 547
 548                         /*
 549                          * Handle socket delivery policy for any-source
 550                          * and source-specific multicast. [RFC3678]
 551                          */
 552                         imo = inp->inp_moptions;
 553                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 554                                 struct sockaddr_in       group;
 555                                 int                      blocked;
 556                                 if (imo == NULL) {
 557                                         INP_RUNLOCK(inp);
 558                                         continue;
 559                                 }
 560                                 bzero(&group, sizeof(struct sockaddr_in));
 561                                 group.sin_len = sizeof(struct sockaddr_in);
 562                                 group.sin_family = AF_INET;
 563                                 group.sin_addr = ip->ip_dst;
 564
 565                                 blocked = imo_multi_filter(imo, ifp,
 566                                         (struct sockaddr *)&group,
 567                                         (struct sockaddr *)&udp_in);
 568                                 if (blocked != MCAST_PASS) {
 569                                         if (blocked == MCAST_NOTGMEMBER)
 570                                                 IPSTAT_INC(ips_notmember);
 571                                         if (blocked == MCAST_NOTSMEMBER ||
 572                                             blocked == MCAST_MUTED)
 573                                                 UDPSTAT_INC(udps_filtermcast);
 574                                         INP_RUNLOCK(inp);
 575                                         continue;
 576                                 }
 577                         }
 578                         if (last != NULL) {
 579                                 struct mbuf *n;
 580
 581                                 n = m_copy(m, 0, M_COPYALL);
 582                                 udp_append(last, ip, n, iphlen, &udp_in);
 583                                 INP_RUNLOCK(last);
 584                         }
 585                         last = inp;
 586                         /*
 587                          * Don't look for additional matches if this one does
 588                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 589                          * socket options set.  This heuristic avoids
 590                          * searching through all pcbs in the common case of a
 591                          * non-shared port.  It assumes that an application
 592                          * will never clear these options after setting them.
 593                          */
 594                         if ((last->inp_socket->so_options &
 595                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 596                                 break;
 597                 }
 598
 599                 if (last == NULL) {
 600                         /*
 601                          * No matching pcb found; discard datagram.  (No need
 602                          * to send an ICMP Port Unreachable for a broadcast
 603                          * or multicast datgram.)
 604                          */
 605                         UDPSTAT_INC(udps_noportbcast);
 606                         if (inp)
 607                                 INP_RUNLOCK(inp);
 608                         INP_INFO_RUNLOCK(pcbinfo);
 609                         goto badunlocked;
 610                 }
 611                 udp_append(last, ip, m, iphlen, &udp_in);
 612                 INP_RUNLOCK(last);
 613                 INP_INFO_RUNLOCK(pcbinfo);
 614                 return (IPPROTO_DONE);
 615         }
 616
 617         /*
 618          * Locate pcb for datagram.
 619          */
 620
 621         /*
 622          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 623          */
 624         if ((m->m_flags & M_IP_NEXTHOP) &&
 625             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 626                 struct sockaddr_in *next_hop;
 627
 628                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 629
 630                 /*
 631                  * Transparently forwarded. Pretend to be the destination.
 632                  * Already got one like this?
 633                  */
 634                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 635                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 636                 if (!inp) {
 637                         /*
 638                          * It's new.  Try to find the ambushing socket.
 639                          * Because we've rewritten the destination address,
 640                          * any hardware-generated hash is ignored.
 641                          */
 642                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 643                             uh->uh_sport, next_hop->sin_addr,
 644                             next_hop->sin_port ? htons(next_hop->sin_port) :
 645                             uh->uh_dport, INPLOOKUP_WILDCARD |
 646                             INPLOOKUP_RLOCKPCB, ifp);
 647                 }
 648                 /* Remove the tag from the packet. We don't need it anymore. */
 649                 m_tag_delete(m, fwd_tag);
 650                 m->m_flags &= ~M_IP_NEXTHOP;
 651         } else
 652                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 653                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 654                     INPLOOKUP_RLOCKPCB, ifp, m);
 655         if (inp == NULL) {
 656                 if (udp_log_in_vain) {
 657                         char buf[4*sizeof "123"];
 658
 659                         strcpy(buf, inet_ntoa(ip->ip_dst));
 660                         log(LOG_INFO,
 661                             "Connection attempt to UDP %s:%d from %s:%d\n",
 662                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 663                             ntohs(uh->uh_sport));
 664                 }
 665                 UDPSTAT_INC(udps_noport);
 666                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 667                         UDPSTAT_INC(udps_noportbcast);
 668                         goto badunlocked;
 669                 }
 670                 if (V_udp_blackhole)
 671                         goto badunlocked;
 672                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 673                         goto badunlocked;
 674                 *ip = save_ip;
 675                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 676                 return (IPPROTO_DONE);
 677         }
 678
 679         /*
 680          * Check the minimum TTL for socket.
 681          */
 682         INP_RLOCK_ASSERT(inp);
 683         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 684                 INP_RUNLOCK(inp);
 685                 m_freem(m);
 686                 return (IPPROTO_DONE);
 687         }
 688         if (cscov_partial) {
 689                 struct udpcb *up;
 690
 691                 up = intoudpcb(inp);
 692                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 693                         INP_RUNLOCK(inp);
 694                         m_freem(m);
 695                         return (IPPROTO_DONE);
 696                 }
 697         }
 698
 699         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 700         udp_append(inp, ip, m, iphlen, &udp_in);
 701         INP_RUNLOCK(inp);
 702         return (IPPROTO_DONE);
 703
 704 badunlocked:
 705         m_freem(m);
 706         return (IPPROTO_DONE);
 707 }
 708 #endif /* INET */
 709
 710 /*
 711  * Notify a udp user of an asynchronous error; just wake up so that they can
 712  * collect error status.
 713  */
 714 struct inpcb *
 715 udp_notify(struct inpcb *inp, int errno)
 716 {
 717
 718         /*
 719          * While udp_ctlinput() always calls udp_notify() with a read lock
 720          * when invoking it directly, in_pcbnotifyall() currently uses write
 721          * locks due to sharing code with TCP.  For now, accept either a read
 722          * or a write lock, but a read lock is sufficient.
 723          */
 724         INP_LOCK_ASSERT(inp);
 725
 726         inp->inp_socket->so_error = errno;
 727         sorwakeup(inp->inp_socket);
 728         sowwakeup(inp->inp_socket);
 729         return (inp);
 730 }
 731
 732 #ifdef INET
 733 static void
 734 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 735     struct inpcbinfo *pcbinfo)
 736 {
 737         struct ip *ip = vip;
 738         struct udphdr *uh;
 739         struct in_addr faddr;
 740         struct inpcb *inp;
 741
 742         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 743         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 744                 return;
 745
 746         /*
 747          * Redirects don't need to be handled up here.
 748          */
 749         if (PRC_IS_REDIRECT(cmd))
 750                 return;
 751
 752         /*
 753          * Hostdead is ugly because it goes linearly through all PCBs.
 754          *
 755          * XXX: We never get this from ICMP, otherwise it makes an excellent
 756          * DoS attack on machines with many connections.
 757          */
 758         if (cmd == PRC_HOSTDEAD)
 759                 ip = NULL;
 760         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 761                 return;
 762         if (ip != NULL) {
 763                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 764                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 765                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 766                 if (inp != NULL) {
 767                         INP_RLOCK_ASSERT(inp);
 768                         if (inp->inp_socket != NULL) {
 769                                 udp_notify(inp, inetctlerrmap[cmd]);
 770                         }
 771                         INP_RUNLOCK(inp);
 772                 }
 773         } else
 774                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 775                     udp_notify);
 776 }
 777 void
 778 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 779 {
 780
 781         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 782 }
 783
 784 void
 785 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 786 {
 787
 788         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 789 }
 790 #endif /* INET */
 791
 792 static int
 793 udp_pcblist(SYSCTL_HANDLER_ARGS)
 794 {
 795         int error, i, n;
 796         struct inpcb *inp, **inp_list;
 797         inp_gen_t gencnt;
 798         struct xinpgen xig;
 799
 800         /*
 801          * The process of preparing the PCB list is too time-consuming and
 802          * resource-intensive to repeat twice on every request.
 803          */
 804         if (req->oldptr == 0) {
 805                 n = V_udbinfo.ipi_count;
 806                 n += imax(n / 8, 10);
 807                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 808                 return (0);
 809         }
 810
 811         if (req->newptr != 0)
 812                 return (EPERM);
 813
 814         /*
 815          * OK, now we're committed to doing something.
 816          */
 817         INP_INFO_RLOCK(&V_udbinfo);
 818         gencnt = V_udbinfo.ipi_gencnt;
 819         n = V_udbinfo.ipi_count;
 820         INP_INFO_RUNLOCK(&V_udbinfo);
 821
 822         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 823                 + n * sizeof(struct xinpcb));
 824         if (error != 0)
 825                 return (error);
 826
 827         xig.xig_len = sizeof xig;
 828         xig.xig_count = n;
 829         xig.xig_gen = gencnt;
 830         xig.xig_sogen = so_gencnt;
 831         error = SYSCTL_OUT(req, &xig, sizeof xig);
 832         if (error)
 833                 return (error);
 834
 835         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 836         if (inp_list == 0)
 837                 return (ENOMEM);
 838
 839         INP_INFO_RLOCK(&V_udbinfo);
 840         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 841              inp = LIST_NEXT(inp, inp_list)) {
 842                 INP_WLOCK(inp);
 843                 if (inp->inp_gencnt <= gencnt &&
 844                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 845                         in_pcbref(inp);
 846                         inp_list[i++] = inp;
 847                 }
 848                 INP_WUNLOCK(inp);
 849         }
 850         INP_INFO_RUNLOCK(&V_udbinfo);
 851         n = i;
 852
 853         error = 0;
 854         for (i = 0; i < n; i++) {
 855                 inp = inp_list[i];
 856                 INP_RLOCK(inp);
 857                 if (inp->inp_gencnt <= gencnt) {
 858                         struct xinpcb xi;
 859
 860                         bzero(&xi, sizeof(xi));
 861                         xi.xi_len = sizeof xi;
 862                         /* XXX should avoid extra copy */
 863                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 864                         if (inp->inp_socket)
 865                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 866                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 867                         INP_RUNLOCK(inp);
 868                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 869                 } else
 870                         INP_RUNLOCK(inp);
 871         }
 872         INP_INFO_WLOCK(&V_udbinfo);
 873         for (i = 0; i < n; i++) {
 874                 inp = inp_list[i];
 875                 INP_RLOCK(inp);
 876                 if (!in_pcbrele_rlocked(inp))
 877                         INP_RUNLOCK(inp);
 878         }
 879         INP_INFO_WUNLOCK(&V_udbinfo);
 880
 881         if (!error) {
 882                 /*
 883                  * Give the user an updated idea of our state.  If the
 884                  * generation differs from what we told her before, she knows
 885                  * that something happened while we were processing this
 886                  * request, and it might be necessary to retry.
 887                  */
 888                 INP_INFO_RLOCK(&V_udbinfo);
 889                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 890                 xig.xig_sogen = so_gencnt;
 891                 xig.xig_count = V_udbinfo.ipi_count;
 892                 INP_INFO_RUNLOCK(&V_udbinfo);
 893                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 894         }
 895         free(inp_list, M_TEMP);
 896         return (error);
 897 }
 898
 899 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 900     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 901     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 902
 903 #ifdef INET
 904 static int
 905 udp_getcred(SYSCTL_HANDLER_ARGS)
 906 {
 907         struct xucred xuc;
 908         struct sockaddr_in addrs[2];
 909         struct inpcb *inp;
 910         int error;
 911
 912         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 913         if (error)
 914                 return (error);
 915         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 916         if (error)
 917                 return (error);
 918         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 919             addrs[0].sin_addr, addrs[0].sin_port,
 920             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 921         if (inp != NULL) {
 922                 INP_RLOCK_ASSERT(inp);
 923                 if (inp->inp_socket == NULL)
 924                         error = ENOENT;
 925                 if (error == 0)
 926                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 927                 if (error == 0)
 928                         cru2x(inp->inp_cred, &xuc);
 929                 INP_RUNLOCK(inp);
 930         } else
 931                 error = ENOENT;
 932         if (error == 0)
 933                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 934         return (error);
 935 }
 936
 937 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 938     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 939     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 940 #endif /* INET */
 941
 942 int
 943 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 944 {
 945         struct inpcb *inp;
 946         struct udpcb *up;
 947         int isudplite, error, optval;
 948
 949         error = 0;
 950         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 951         inp = sotoinpcb(so);
 952         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 953         INP_WLOCK(inp);
 954         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 955 #ifdef INET6
 956                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 957                         INP_WUNLOCK(inp);
 958                         error = ip6_ctloutput(so, sopt);
 959                 }
 960 #endif
 961 #if defined(INET) && defined(INET6)
 962                 else
 963 #endif
 964 #ifdef INET
 965                 {
 966                         INP_WUNLOCK(inp);
 967                         error = ip_ctloutput(so, sopt);
 968                 }
 969 #endif
 970                 return (error);
 971         }
 972
 973         switch (sopt->sopt_dir) {
 974         case SOPT_SET:
 975                 switch (sopt->sopt_name) {
 976                 case UDP_ENCAP:
 977                         INP_WUNLOCK(inp);
 978                         error = sooptcopyin(sopt, &optval, sizeof optval,
 979                                             sizeof optval);
 980                         if (error)
 981                                 break;
 982                         inp = sotoinpcb(so);
 983                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 984                         INP_WLOCK(inp);
 985 #ifdef IPSEC_NAT_T
 986                         up = intoudpcb(inp);
 987                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 988 #endif
 989                         switch (optval) {
 990                         case 0:
 991                                 /* Clear all UDP encap. */
 992 #ifdef IPSEC_NAT_T
 993                                 up->u_flags &= ~UF_ESPINUDP_ALL;
 994 #endif
 995                                 break;
 996 #ifdef IPSEC_NAT_T
 997                         case UDP_ENCAP_ESPINUDP:
 998                         case UDP_ENCAP_ESPINUDP_NON_IKE:
 999                                 up->u_flags &= ~UF_ESPINUDP_ALL;
1000                                 if (optval == UDP_ENCAP_ESPINUDP)
1001                                         up->u_flags |= UF_ESPINUDP;
1002                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
1003                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
1004                                 break;
1005 #endif
1006                         default:
1007                                 error = EINVAL;
1008                                 break;
1009                         }
1010                         INP_WUNLOCK(inp);
1011                         break;
1012                 case UDPLITE_SEND_CSCOV:
1013                 case UDPLITE_RECV_CSCOV:
1014                         if (!isudplite) {
1015                                 INP_WUNLOCK(inp);
1016                                 error = ENOPROTOOPT;
1017                                 break;
1018                         }
1019                         INP_WUNLOCK(inp);
1020                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1021                             sizeof(optval));
1022                         if (error != 0)
1023                                 break;
1024                         inp = sotoinpcb(so);
1025                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1026                         INP_WLOCK(inp);
1027                         up = intoudpcb(inp);
1028                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1029                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1030                                 INP_WUNLOCK(inp);
1031                                 error = EINVAL;
1032                                 break;
1033                         }
1034                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1035                                 up->u_txcslen = optval;
1036                         else
1037                                 up->u_rxcslen = optval;
1038                         INP_WUNLOCK(inp);
1039                         break;
1040                 default:
1041                         INP_WUNLOCK(inp);
1042                         error = ENOPROTOOPT;
1043                         break;
1044                 }
1045                 break;
1046         case SOPT_GET:
1047                 switch (sopt->sopt_name) {
1048 #ifdef IPSEC_NAT_T
1049                 case UDP_ENCAP:
1050                         up = intoudpcb(inp);
1051                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1052                         optval = up->u_flags & UF_ESPINUDP_ALL;
1053                         INP_WUNLOCK(inp);
1054                         error = sooptcopyout(sopt, &optval, sizeof optval);
1055                         break;
1056 #endif
1057                 case UDPLITE_SEND_CSCOV:
1058                 case UDPLITE_RECV_CSCOV:
1059                         if (!isudplite) {
1060                                 INP_WUNLOCK(inp);
1061                                 error = ENOPROTOOPT;
1062                                 break;
1063                         }
1064                         up = intoudpcb(inp);
1065                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1066                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1067                                 optval = up->u_txcslen;
1068                         else
1069                                 optval = up->u_rxcslen;
1070                         INP_WUNLOCK(inp);
1071                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1072                         break;
1073                 default:
1074                         INP_WUNLOCK(inp);
1075                         error = ENOPROTOOPT;
1076                         break;
1077                 }
1078                 break;
1079         }
1080         return (error);
1081 }
1082
1083 #ifdef INET
1084 #define UH_WLOCKED      2
1085 #define UH_RLOCKED      1
1086 #define UH_UNLOCKED     0
1087 static int
1088 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1089     struct mbuf *control, struct thread *td)
1090 {
1091         struct udpiphdr *ui;
1092         int len = m->m_pkthdr.len;
1093         struct in_addr faddr, laddr;
1094         struct cmsghdr *cm;
1095         struct inpcbinfo *pcbinfo;
1096         struct sockaddr_in *sin, src;
1097         int cscov_partial = 0;
1098         int error = 0;
1099         int ipflags;
1100         u_short fport, lport;
1101         int unlock_udbinfo;
1102         u_char tos;
1103         uint8_t pr;
1104         uint16_t cscov = 0;
1105         uint32_t flowid = 0;
1106         int flowid_type = 0;
1107         int use_flowid = 0;
1108
1109         /*
1110          * udp_output() may need to temporarily bind or connect the current
1111          * inpcb.  As such, we don't know up front whether we will need the
1112          * pcbinfo lock or not.  Do any work to decide what is needed up
1113          * front before acquiring any locks.
1114          */
1115         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1116                 if (control)
1117                         m_freem(control);
1118                 m_freem(m);
1119                 return (EMSGSIZE);
1120         }
1121
1122         src.sin_family = 0;
1123         INP_RLOCK(inp);
1124         tos = inp->inp_ip_tos;
1125         if (control != NULL) {
1126                 /*
1127                  * XXX: Currently, we assume all the optional information is
1128                  * stored in a single mbuf.
1129                  */
1130                 if (control->m_next) {
1131                         INP_RUNLOCK(inp);
1132                         m_freem(control);
1133                         m_freem(m);
1134                         return (EINVAL);
1135                 }
1136                 for (; control->m_len > 0;
1137                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1138                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1139                         cm = mtod(control, struct cmsghdr *);
1140                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1141                             || cm->cmsg_len > control->m_len) {
1142                                 error = EINVAL;
1143                                 break;
1144                         }
1145                         if (cm->cmsg_level != IPPROTO_IP)
1146                                 continue;
1147
1148                         switch (cm->cmsg_type) {
1149                         case IP_SENDSRCADDR:
1150                                 if (cm->cmsg_len !=
1151                                     CMSG_LEN(sizeof(struct in_addr))) {
1152                                         error = EINVAL;
1153                                         break;
1154                                 }
1155                                 bzero(&src, sizeof(src));
1156                                 src.sin_family = AF_INET;
1157                                 src.sin_len = sizeof(src);
1158                                 src.sin_port = inp->inp_lport;
1159                                 src.sin_addr =
1160                                     *(struct in_addr *)CMSG_DATA(cm);
1161                                 break;
1162
1163                         case IP_TOS:
1164                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1165                                         error = EINVAL;
1166                                         break;
1167                                 }
1168                                 tos = *(u_char *)CMSG_DATA(cm);
1169                                 break;
1170
1171                         case IP_FLOWID:
1172                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1173                                         error = EINVAL;
1174                                         break;
1175                                 }
1176                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1177                                 break;
1178
1179                         case IP_FLOWTYPE:
1180                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1181                                         error = EINVAL;
1182                                         break;
1183                                 }
1184                                 flowid_type = *(uint32_t *) CMSG_DATA(cm);
1185                                 use_flowid = 1;
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 (use_flowid) {
1452                 m->m_flags |= M_FLOWID;
1453                 m->m_pkthdr.flowid = flowid;
1454                 M_HASHTYPE_SET(m, flowid_type);
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->m_flags |= M_FLOWID;
1478                         M_HASHTYPE_SET(m, hash_type);
1479                 }
1480 #endif
1481         }
1482
1483 #ifdef  RSS
1484         /*
1485          * Don't override with the inp cached flowid value.
1486          *
1487          * Depending upon the kind of send being done, the inp
1488          * flowid/flowtype values may actually not be appropriate
1489          * for this particular socket send.
1490          *
1491          * We should either leave the flowid at zero (which is what is
1492          * currently done) or set it to some software generated
1493          * hash value based on the packet contents.
1494          */
1495         ipflags |= IP_NODEFAULTFLOWID;
1496 #endif  /* RSS */
1497
1498         if (unlock_udbinfo == UH_WLOCKED)
1499                 INP_HASH_WUNLOCK(pcbinfo);
1500         else if (unlock_udbinfo == UH_RLOCKED)
1501                 INP_HASH_RUNLOCK(pcbinfo);
1502         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1503         error = ip_output(m, inp->inp_options, NULL, ipflags,
1504             inp->inp_moptions, inp);
1505         if (unlock_udbinfo == UH_WLOCKED)
1506                 INP_WUNLOCK(inp);
1507         else
1508                 INP_RUNLOCK(inp);
1509         return (error);
1510
1511 release:
1512         if (unlock_udbinfo == UH_WLOCKED) {
1513                 INP_HASH_WUNLOCK(pcbinfo);
1514                 INP_WUNLOCK(inp);
1515         } else if (unlock_udbinfo == UH_RLOCKED) {
1516                 INP_HASH_RUNLOCK(pcbinfo);
1517                 INP_RUNLOCK(inp);
1518         } else
1519                 INP_RUNLOCK(inp);
1520         m_freem(m);
1521         return (error);
1522 }
1523
1524
1525 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1526 /*
1527  * Potentially decap ESP in UDP frame.  Check for an ESP header
1528  * and optional marker; if present, strip the UDP header and
1529  * push the result through IPSec.
1530  *
1531  * Returns mbuf to be processed (potentially re-allocated) or
1532  * NULL if consumed and/or processed.
1533  */
1534 static struct mbuf *
1535 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1536 {
1537         size_t minlen, payload, skip, iphlen;
1538         caddr_t data;
1539         struct udpcb *up;
1540         struct m_tag *tag;
1541         struct udphdr *udphdr;
1542         struct ip *ip;
1543
1544         INP_RLOCK_ASSERT(inp);
1545
1546         /*
1547          * Pull up data so the longest case is contiguous:
1548          *    IP/UDP hdr + non ESP marker + ESP hdr.
1549          */
1550         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1551         if (minlen > m->m_pkthdr.len)
1552                 minlen = m->m_pkthdr.len;
1553         if ((m = m_pullup(m, minlen)) == NULL) {
1554                 IPSECSTAT_INC(ips_in_inval);
1555                 return (NULL);          /* Bypass caller processing. */
1556         }
1557         data = mtod(m, caddr_t);        /* Points to ip header. */
1558         payload = m->m_len - off;       /* Size of payload. */
1559
1560         if (payload == 1 && data[off] == '\xff')
1561                 return (m);             /* NB: keepalive packet, no decap. */
1562
1563         up = intoudpcb(inp);
1564         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1565         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1566             ("u_flags 0x%x", up->u_flags));
1567
1568         /*
1569          * Check that the payload is large enough to hold an
1570          * ESP header and compute the amount of data to remove.
1571          *
1572          * NB: the caller has already done a pullup for us.
1573          * XXX can we assume alignment and eliminate bcopys?
1574          */
1575         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1576                 /*
1577                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1578                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1579                  * possible AH mode non-IKE marker+non-ESP marker
1580                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1581                  */
1582                 uint64_t marker;
1583
1584                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1585                         return (m);     /* NB: no decap. */
1586                 bcopy(data + off, &marker, sizeof(uint64_t));
1587                 if (marker != 0)        /* Non-IKE marker. */
1588                         return (m);     /* NB: no decap. */
1589                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1590         } else {
1591                 uint32_t spi;
1592
1593                 if (payload <= sizeof(struct esp)) {
1594                         IPSECSTAT_INC(ips_in_inval);
1595                         m_freem(m);
1596                         return (NULL);  /* Discard. */
1597                 }
1598                 bcopy(data + off, &spi, sizeof(uint32_t));
1599                 if (spi == 0)           /* Non-ESP marker. */
1600                         return (m);     /* NB: no decap. */
1601                 skip = sizeof(struct udphdr);
1602         }
1603
1604         /*
1605          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1606          * the UDP ports. This is required if we want to select
1607          * the right SPD for multiple hosts behind same NAT.
1608          *
1609          * NB: ports are maintained in network byte order everywhere
1610          *     in the NAT-T code.
1611          */
1612         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1613                 2 * sizeof(uint16_t), M_NOWAIT);
1614         if (tag == NULL) {
1615                 IPSECSTAT_INC(ips_in_nomem);
1616                 m_freem(m);
1617                 return (NULL);          /* Discard. */
1618         }
1619         iphlen = off - sizeof(struct udphdr);
1620         udphdr = (struct udphdr *)(data + iphlen);
1621         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1622         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1623         m_tag_prepend(m, tag);
1624
1625         /*
1626          * Remove the UDP header (and possibly the non ESP marker)
1627          * IP header length is iphlen
1628          * Before:
1629          *   <--- off --->
1630          *   +----+------+-----+
1631          *   | IP |  UDP | ESP |
1632          *   +----+------+-----+
1633          *        <-skip->
1634          * After:
1635          *          +----+-----+
1636          *          | IP | ESP |
1637          *          +----+-----+
1638          *   <-skip->
1639          */
1640         ovbcopy(data, data + skip, iphlen);
1641         m_adj(m, skip);
1642
1643         ip = mtod(m, struct ip *);
1644         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1645         ip->ip_p = IPPROTO_ESP;
1646
1647         /*
1648          * We cannot yet update the cksums so clear any
1649          * h/w cksum flags as they are no longer valid.
1650          */
1651         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1652                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1653
1654         (void) ipsec4_common_input(m, iphlen, ip->ip_p);
1655         return (NULL);                  /* NB: consumed, bypass processing. */
1656 }
1657 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1658
1659 static void
1660 udp_abort(struct socket *so)
1661 {
1662         struct inpcb *inp;
1663         struct inpcbinfo *pcbinfo;
1664
1665         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1666         inp = sotoinpcb(so);
1667         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1668         INP_WLOCK(inp);
1669         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1670                 INP_HASH_WLOCK(pcbinfo);
1671                 in_pcbdisconnect(inp);
1672                 inp->inp_laddr.s_addr = INADDR_ANY;
1673                 INP_HASH_WUNLOCK(pcbinfo);
1674                 soisdisconnected(so);
1675         }
1676         INP_WUNLOCK(inp);
1677 }
1678
1679 static int
1680 udp_attach(struct socket *so, int proto, struct thread *td)
1681 {
1682         struct inpcb *inp;
1683         struct inpcbinfo *pcbinfo;
1684         int error;
1685
1686         pcbinfo = get_inpcbinfo(so->so_proto->pr_protocol);
1687         inp = sotoinpcb(so);
1688         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1689         error = soreserve(so, udp_sendspace, udp_recvspace);
1690         if (error)
1691                 return (error);
1692         INP_INFO_WLOCK(pcbinfo);
1693         error = in_pcballoc(so, pcbinfo);
1694         if (error) {
1695                 INP_INFO_WUNLOCK(pcbinfo);
1696                 return (error);
1697         }
1698
1699         inp = sotoinpcb(so);
1700         inp->inp_vflag |= INP_IPV4;
1701         inp->inp_ip_ttl = V_ip_defttl;
1702
1703         error = udp_newudpcb(inp);
1704         if (error) {
1705                 in_pcbdetach(inp);
1706                 in_pcbfree(inp);
1707                 INP_INFO_WUNLOCK(pcbinfo);
1708                 return (error);
1709         }
1710
1711         INP_WUNLOCK(inp);
1712         INP_INFO_WUNLOCK(pcbinfo);
1713         return (0);
1714 }
1715 #endif /* INET */
1716
1717 int
1718 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f)
1719 {
1720         struct inpcb *inp;
1721         struct udpcb *up;
1722
1723         KASSERT(so->so_type == SOCK_DGRAM,
1724             ("udp_set_kernel_tunneling: !dgram"));
1725         inp = sotoinpcb(so);
1726         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1727         INP_WLOCK(inp);
1728         up = intoudpcb(inp);
1729         if (up->u_tun_func != NULL) {
1730                 INP_WUNLOCK(inp);
1731                 return (EBUSY);
1732         }
1733         up->u_tun_func = f;
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 */