sys/netinet/udp_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   5  *      The Regents of the University of California.
   6  * Copyright (c) 2008 Robert N. M. Watson
   7  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   8  * Copyright (c) 2014 Kevin Lo
   9  * All rights reserved.
  10  *
  11  * Portions of this software were developed by Robert N. M. Watson under
  12  * contract to Juniper Networks, Inc.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  39  */
  40
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include "opt_inet.h"
  45 #include "opt_inet6.h"
  46 #include "opt_ipsec.h"
  47 #include "opt_rss.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/domain.h>
  51 #include <sys/eventhandler.h>
  52 #include <sys/jail.h>
  53 #include <sys/kernel.h>
  54 #include <sys/lock.h>
  55 #include <sys/malloc.h>
  56 #include <sys/mbuf.h>
  57 #include <sys/priv.h>
  58 #include <sys/proc.h>
  59 #include <sys/protosw.h>
  60 #include <sys/sdt.h>
  61 #include <sys/signalvar.h>
  62 #include <sys/socket.h>
  63 #include <sys/socketvar.h>
  64 #include <sys/sx.h>
  65 #include <sys/sysctl.h>
  66 #include <sys/syslog.h>
  67 #include <sys/systm.h>
  68
  69 #include <vm/uma.h>
  70
  71 #include <net/if.h>
  72 #include <net/if_var.h>
  73 #include <net/route.h>
  74 #include <net/rss_config.h>
  75
  76 #include <netinet/in.h>
  77 #include <netinet/in_kdtrace.h>
  78 #include <netinet/in_pcb.h>
  79 #include <netinet/in_systm.h>
  80 #include <netinet/in_var.h>
  81 #include <netinet/ip.h>
  82 #ifdef INET6
  83 #include <netinet/ip6.h>
  84 #endif
  85 #include <netinet/ip_icmp.h>
  86 #include <netinet/icmp_var.h>
  87 #include <netinet/ip_var.h>
  88 #include <netinet/ip_options.h>
  89 #ifdef INET6
  90 #include <netinet6/ip6_var.h>
  91 #endif
  92 #include <netinet/udp.h>
  93 #include <netinet/udp_var.h>
  94 #include <netinet/udplite.h>
  95 #include <netinet/in_rss.h>
  96
  97 #include <netipsec/ipsec_support.h>
  98
  99 #include <machine/in_cksum.h>
 100
 101 #include <security/mac/mac_framework.h>
 102
 103 /*
 104  * UDP and UDP-Lite protocols implementation.
 105  * Per RFC 768, August, 1980.
 106  * Per RFC 3828, July, 2004.
 107  */
 108
 109 /*
 110  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 111  * removes the only data integrity mechanism for packets and malformed
 112  * packets that would otherwise be discarded due to bad checksums, and may
 113  * cause problems (especially for NFS data blocks).
 114  */
 115 VNET_DEFINE(int, udp_cksum) = 1;
 116 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 117     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 118
 119 int     udp_log_in_vain = 0;
 120 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 121     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 122
 123 VNET_DEFINE(int, udp_blackhole) = 0;
 124 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 125     &VNET_NAME(udp_blackhole), 0,
 126     "Do not send port unreachables for refused connects");
 127
 128 u_long  udp_sendspace = 9216;           /* really max datagram size */
 129 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 130     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 131
 132 u_long  udp_recvspace = 40 * (1024 +
 133 #ifdef INET6
 134                                       sizeof(struct sockaddr_in6)
 135 #else
 136                                       sizeof(struct sockaddr_in)
 137 #endif
 138                                       );        /* 40 1K datagrams */
 139
 140 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 141     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 142
 143 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 144 VNET_DEFINE(struct inpcbinfo, udbinfo);
 145 VNET_DEFINE(struct inpcbhead, ulitecb);
 146 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 147 VNET_DEFINE_STATIC(uma_zone_t, udpcb_zone);
 148 #define V_udpcb_zone                    VNET(udpcb_zone)
 149
 150 #ifndef UDBHASHSIZE
 151 #define UDBHASHSIZE     128
 152 #endif
 153
 154 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 155 VNET_PCPUSTAT_SYSINIT(udpstat);
 156 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 157     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 158
 159 #ifdef VIMAGE
 160 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 161 #endif /* VIMAGE */
 162 #ifdef INET
 163 static void     udp_detach(struct socket *so);
 164 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 165                     struct mbuf *, struct thread *);
 166 #endif
 167
 168 static void
 169 udp_zone_change(void *tag)
 170 {
 171
 172         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 173         uma_zone_set_max(V_udpcb_zone, maxsockets);
 174 }
 175
 176 static int
 177 udp_inpcb_init(void *mem, int size, int flags)
 178 {
 179         struct inpcb *inp;
 180
 181         inp = mem;
 182         INP_LOCK_INIT(inp, "inp", "udpinp");
 183         return (0);
 184 }
 185
 186 static int
 187 udplite_inpcb_init(void *mem, int size, int flags)
 188 {
 189         struct inpcb *inp;
 190
 191         inp = mem;
 192         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 193         return (0);
 194 }
 195
 196 void
 197 udp_init(void)
 198 {
 199
 200         /*
 201          * For now default to 2-tuple UDP hashing - until the fragment
 202          * reassembly code can also update the flowid.
 203          *
 204          * Once we can calculate the flowid that way and re-establish
 205          * a 4-tuple, flip this to 4-tuple.
 206          */
 207         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 208             "udp_inpcb", udp_inpcb_init, IPI_HASHFIELDS_2TUPLE);
 209         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 210             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 211         uma_zone_set_max(V_udpcb_zone, maxsockets);
 212         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 213         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 214             EVENTHANDLER_PRI_ANY);
 215 }
 216
 217 void
 218 udplite_init(void)
 219 {
 220
 221         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 222             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init,
 223             IPI_HASHFIELDS_2TUPLE);
 224 }
 225
 226 /*
 227  * Kernel module interface for updating udpstat.  The argument is an index
 228  * into udpstat treated as an array of u_long.  While this encodes the
 229  * general layout of udpstat into the caller, it doesn't encode its location,
 230  * so that future changes to add, for example, per-CPU stats support won't
 231  * cause binary compatibility problems for kernel modules.
 232  */
 233 void
 234 kmod_udpstat_inc(int statnum)
 235 {
 236
 237         counter_u64_add(VNET(udpstat)[statnum], 1);
 238 }
 239
 240 int
 241 udp_newudpcb(struct inpcb *inp)
 242 {
 243         struct udpcb *up;
 244
 245         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 246         if (up == NULL)
 247                 return (ENOBUFS);
 248         inp->inp_ppcb = up;
 249         return (0);
 250 }
 251
 252 void
 253 udp_discardcb(struct udpcb *up)
 254 {
 255
 256         uma_zfree(V_udpcb_zone, up);
 257 }
 258
 259 #ifdef VIMAGE
 260 static void
 261 udp_destroy(void *unused __unused)
 262 {
 263
 264         in_pcbinfo_destroy(&V_udbinfo);
 265         uma_zdestroy(V_udpcb_zone);
 266 }
 267 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 268
 269 static void
 270 udplite_destroy(void *unused __unused)
 271 {
 272
 273         in_pcbinfo_destroy(&V_ulitecbinfo);
 274 }
 275 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 276     NULL);
 277 #endif
 278
 279 #ifdef INET
 280 /*
 281  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 282  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 283  * contains the source address.  If the socket ends up being an IPv6 socket,
 284  * udp_append() will convert to a sockaddr_in6 before passing the address
 285  * into the socket code.
 286  *
 287  * In the normal case udp_append() will return 0, indicating that you
 288  * must unlock the inp. However if a tunneling protocol is in place we increment
 289  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 290  * then decrement the reference count. If the inp_rele returns 1, indicating the
 291  * inp is gone, we return that to the caller to tell them *not* to unlock
 292  * the inp. In the case of multi-cast this will cause the distribution
 293  * to stop (though most tunneling protocols known currently do *not* use
 294  * multicast).
 295  */
 296 static int
 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 *tmpopts, *opts = NULL;
 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                 in_pcbref(inp);
 316                 INP_RUNLOCK(inp);
 317                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&udp_in[0],
 318                     up->u_tun_ctx);
 319                 INP_RLOCK(inp);
 320                 return (in_pcbrele_rlocked(inp));
 321         }
 322
 323         off += sizeof(struct udphdr);
 324
 325 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 326         /* Check AH/ESP integrity. */
 327         if (IPSEC_ENABLED(ipv4) &&
 328             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 329                 m_freem(n);
 330                 return (0);
 331         }
 332         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 333                 if (IPSEC_ENABLED(ipv4) &&
 334                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 335                         return (0);     /* Consumed. */
 336         }
 337 #endif /* IPSEC */
 338 #ifdef MAC
 339         if (mac_inpcb_check_deliver(inp, n) != 0) {
 340                 m_freem(n);
 341                 return (0);
 342         }
 343 #endif /* MAC */
 344         if (inp->inp_flags & INP_CONTROLOPTS ||
 345             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 346 #ifdef INET6
 347                 if (inp->inp_vflag & INP_IPV6)
 348                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 349                 else
 350 #endif /* INET6 */
 351                         ip_savecontrol(inp, &opts, ip, n);
 352         }
 353         if ((inp->inp_vflag & INP_IPV4) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 354                 tmpopts = sbcreatecontrol((caddr_t)&udp_in[1],
 355                         sizeof(struct sockaddr_in), IP_ORIGDSTADDR, IPPROTO_IP);
 356                 if (tmpopts) {
 357                         if (opts) {
 358                                 tmpopts->m_next = opts;
 359                                 opts = tmpopts;
 360                         } else
 361                                 opts = tmpopts;
 362                 }
 363         }
 364 #ifdef INET6
 365         if (inp->inp_vflag & INP_IPV6) {
 366                 bzero(&udp_in6, sizeof(udp_in6));
 367                 udp_in6.sin6_len = sizeof(udp_in6);
 368                 udp_in6.sin6_family = AF_INET6;
 369                 in6_sin_2_v4mapsin6(&udp_in[0], &udp_in6);
 370                 append_sa = (struct sockaddr *)&udp_in6;
 371         } else
 372 #endif /* INET6 */
 373                 append_sa = (struct sockaddr *)&udp_in[0];
 374         m_adj(n, off);
 375
 376         so = inp->inp_socket;
 377         SOCKBUF_LOCK(&so->so_rcv);
 378         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 379                 SOCKBUF_UNLOCK(&so->so_rcv);
 380                 m_freem(n);
 381                 if (opts)
 382                         m_freem(opts);
 383                 UDPSTAT_INC(udps_fullsock);
 384         } else
 385                 sorwakeup_locked(so);
 386         return (0);
 387 }
 388
 389 int
 390 udp_input(struct mbuf **mp, int *offp, int proto)
 391 {
 392         struct ip *ip;
 393         struct udphdr *uh;
 394         struct ifnet *ifp;
 395         struct inpcb *inp;
 396         uint16_t len, ip_len;
 397         struct inpcbinfo *pcbinfo;
 398         struct ip save_ip;
 399         struct sockaddr_in udp_in[2];
 400         struct mbuf *m;
 401         struct m_tag *fwd_tag;
 402         struct epoch_tracker et;
 403         int cscov_partial, iphlen;
 404
 405         m = *mp;
 406         iphlen = *offp;
 407         ifp = m->m_pkthdr.rcvif;
 408         *mp = NULL;
 409         UDPSTAT_INC(udps_ipackets);
 410
 411         /*
 412          * Strip IP options, if any; should skip this, make available to
 413          * user, and use on returned packets, but we don't yet have a way to
 414          * check the checksum with options still present.
 415          */
 416         if (iphlen > sizeof (struct ip)) {
 417                 ip_stripoptions(m);
 418                 iphlen = sizeof(struct ip);
 419         }
 420
 421         /*
 422          * Get IP and UDP header together in first mbuf.
 423          */
 424         ip = mtod(m, struct ip *);
 425         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 426                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 427                         UDPSTAT_INC(udps_hdrops);
 428                         return (IPPROTO_DONE);
 429                 }
 430                 ip = mtod(m, struct ip *);
 431         }
 432         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 433         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 434
 435         /*
 436          * Destination port of 0 is illegal, based on RFC768.
 437          */
 438         if (uh->uh_dport == 0)
 439                 goto badunlocked;
 440
 441         /*
 442          * Construct sockaddr format source address.  Stuff source address
 443          * and datagram in user buffer.
 444          */
 445         bzero(&udp_in[0], sizeof(struct sockaddr_in) * 2);
 446         udp_in[0].sin_len = sizeof(struct sockaddr_in);
 447         udp_in[0].sin_family = AF_INET;
 448         udp_in[0].sin_port = uh->uh_sport;
 449         udp_in[0].sin_addr = ip->ip_src;
 450         udp_in[1].sin_len = sizeof(struct sockaddr_in);
 451         udp_in[1].sin_family = AF_INET;
 452         udp_in[1].sin_port = uh->uh_dport;
 453         udp_in[1].sin_addr = ip->ip_dst;
 454
 455         /*
 456          * Make mbuf data length reflect UDP length.  If not enough data to
 457          * reflect UDP length, drop.
 458          */
 459         len = ntohs((u_short)uh->uh_ulen);
 460         ip_len = ntohs(ip->ip_len) - iphlen;
 461         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 462                 /* Zero means checksum over the complete packet. */
 463                 if (len == 0)
 464                         len = ip_len;
 465                 cscov_partial = 0;
 466         }
 467         if (ip_len != len) {
 468                 if (len > ip_len || len < sizeof(struct udphdr)) {
 469                         UDPSTAT_INC(udps_badlen);
 470                         goto badunlocked;
 471                 }
 472                 if (proto == IPPROTO_UDP)
 473                         m_adj(m, len - ip_len);
 474         }
 475
 476         /*
 477          * Save a copy of the IP header in case we want restore it for
 478          * sending an ICMP error message in response.
 479          */
 480         if (!V_udp_blackhole)
 481                 save_ip = *ip;
 482         else
 483                 memset(&save_ip, 0, sizeof(save_ip));
 484
 485         /*
 486          * Checksum extended UDP header and data.
 487          */
 488         if (uh->uh_sum) {
 489                 u_short uh_sum;
 490
 491                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 492                     !cscov_partial) {
 493                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 494                                 uh_sum = m->m_pkthdr.csum_data;
 495                         else
 496                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 497                                     ip->ip_dst.s_addr, htonl((u_short)len +
 498                                     m->m_pkthdr.csum_data + proto));
 499                         uh_sum ^= 0xffff;
 500                 } else {
 501                         char b[9];
 502
 503                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 504                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 505                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 506                             uh->uh_ulen : htons(ip_len);
 507                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 508                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 509                 }
 510                 if (uh_sum) {
 511                         UDPSTAT_INC(udps_badsum);
 512                         m_freem(m);
 513                         return (IPPROTO_DONE);
 514                 }
 515         } else {
 516                 if (proto == IPPROTO_UDP) {
 517                         UDPSTAT_INC(udps_nosum);
 518                 } else {
 519                         /* UDPLite requires a checksum */
 520                         /* XXX: What is the right UDPLite MIB counter here? */
 521                         m_freem(m);
 522                         return (IPPROTO_DONE);
 523                 }
 524         }
 525
 526         pcbinfo = udp_get_inpcbinfo(proto);
 527         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 528             in_broadcast(ip->ip_dst, ifp)) {
 529                 struct inpcb *last;
 530                 struct inpcbhead *pcblist;
 531                 struct ip_moptions *imo;
 532
 533                 INP_INFO_RLOCK_ET(pcbinfo, et);
 534                 pcblist = udp_get_pcblist(proto);
 535                 last = NULL;
 536                 CK_LIST_FOREACH(inp, pcblist, inp_list) {
 537                         if (inp->inp_lport != uh->uh_dport)
 538                                 continue;
 539 #ifdef INET6
 540                         if ((inp->inp_vflag & INP_IPV4) == 0)
 541                                 continue;
 542 #endif
 543                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 544                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 545                                 continue;
 546                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 547                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 548                                 continue;
 549                         if (inp->inp_fport != 0 &&
 550                             inp->inp_fport != uh->uh_sport)
 551                                 continue;
 552
 553                         INP_RLOCK(inp);
 554
 555                         /*
 556                          * XXXRW: Because we weren't holding either the inpcb
 557                          * or the hash lock when we checked for a match
 558                          * before, we should probably recheck now that the
 559                          * inpcb lock is held.
 560                          */
 561
 562                         /*
 563                          * Handle socket delivery policy for any-source
 564                          * and source-specific multicast. [RFC3678]
 565                          */
 566                         imo = inp->inp_moptions;
 567                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 568                                 struct sockaddr_in       group;
 569                                 int                      blocked;
 570                                 if (imo == NULL) {
 571                                         INP_RUNLOCK(inp);
 572                                         continue;
 573                                 }
 574                                 bzero(&group, sizeof(struct sockaddr_in));
 575                                 group.sin_len = sizeof(struct sockaddr_in);
 576                                 group.sin_family = AF_INET;
 577                                 group.sin_addr = ip->ip_dst;
 578
 579                                 blocked = imo_multi_filter(imo, ifp,
 580                                         (struct sockaddr *)&group,
 581                                         (struct sockaddr *)&udp_in[0]);
 582                                 if (blocked != MCAST_PASS) {
 583                                         if (blocked == MCAST_NOTGMEMBER)
 584                                                 IPSTAT_INC(ips_notmember);
 585                                         if (blocked == MCAST_NOTSMEMBER ||
 586                                             blocked == MCAST_MUTED)
 587                                                 UDPSTAT_INC(udps_filtermcast);
 588                                         INP_RUNLOCK(inp);
 589                                         continue;
 590                                 }
 591                         }
 592                         if (last != NULL) {
 593                                 struct mbuf *n;
 594
 595                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 596                                     NULL) {
 597                                         UDP_PROBE(receive, NULL, last, ip,
 598                                             last, uh);
 599                                         if (udp_append(last, ip, n, iphlen,
 600                                                 udp_in)) {
 601                                                 goto inp_lost;
 602                                         }
 603                                 }
 604                                 INP_RUNLOCK(last);
 605                         }
 606                         last = inp;
 607                         /*
 608                          * Don't look for additional matches if this one does
 609                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 610                          * socket options set.  This heuristic avoids
 611                          * searching through all pcbs in the common case of a
 612                          * non-shared port.  It assumes that an application
 613                          * will never clear these options after setting them.
 614                          */
 615                         if ((last->inp_socket->so_options &
 616                             (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
 617                                 break;
 618                 }
 619
 620                 if (last == NULL) {
 621                         /*
 622                          * No matching pcb found; discard datagram.  (No need
 623                          * to send an ICMP Port Unreachable for a broadcast
 624                          * or multicast datgram.)
 625                          */
 626                         UDPSTAT_INC(udps_noportbcast);
 627                         if (inp)
 628                                 INP_RUNLOCK(inp);
 629                         INP_INFO_RUNLOCK_ET(pcbinfo, et);
 630                         goto badunlocked;
 631                 }
 632                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 633                 if (udp_append(last, ip, m, iphlen, udp_in) == 0)
 634                         INP_RUNLOCK(last);
 635         inp_lost:
 636                 INP_INFO_RUNLOCK_ET(pcbinfo, et);
 637                 return (IPPROTO_DONE);
 638         }
 639
 640         /*
 641          * Locate pcb for datagram.
 642          */
 643
 644         /*
 645          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 646          */
 647         if ((m->m_flags & M_IP_NEXTHOP) &&
 648             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 649                 struct sockaddr_in *next_hop;
 650
 651                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 652
 653                 /*
 654                  * Transparently forwarded. Pretend to be the destination.
 655                  * Already got one like this?
 656                  */
 657                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 658                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 659                 if (!inp) {
 660                         /*
 661                          * It's new.  Try to find the ambushing socket.
 662                          * Because we've rewritten the destination address,
 663                          * any hardware-generated hash is ignored.
 664                          */
 665                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 666                             uh->uh_sport, next_hop->sin_addr,
 667                             next_hop->sin_port ? htons(next_hop->sin_port) :
 668                             uh->uh_dport, INPLOOKUP_WILDCARD |
 669                             INPLOOKUP_RLOCKPCB, ifp);
 670                 }
 671                 /* Remove the tag from the packet. We don't need it anymore. */
 672                 m_tag_delete(m, fwd_tag);
 673                 m->m_flags &= ~M_IP_NEXTHOP;
 674         } else
 675                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 676                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 677                     INPLOOKUP_RLOCKPCB, ifp, m);
 678         if (inp == NULL) {
 679                 if (udp_log_in_vain) {
 680                         char src[INET_ADDRSTRLEN];
 681                         char dst[INET_ADDRSTRLEN];
 682
 683                         log(LOG_INFO,
 684                             "Connection attempt to UDP %s:%d from %s:%d\n",
 685                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 686                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 687                 }
 688                 UDP_PROBE(receive, NULL, NULL, ip, NULL, uh);
 689                 UDPSTAT_INC(udps_noport);
 690                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 691                         UDPSTAT_INC(udps_noportbcast);
 692                         goto badunlocked;
 693                 }
 694                 if (V_udp_blackhole)
 695                         goto badunlocked;
 696                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 697                         goto badunlocked;
 698                 *ip = save_ip;
 699                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 700                 return (IPPROTO_DONE);
 701         }
 702
 703         /*
 704          * Check the minimum TTL for socket.
 705          */
 706         INP_RLOCK_ASSERT(inp);
 707         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 708                 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 709                 INP_RUNLOCK(inp);
 710                 m_freem(m);
 711                 return (IPPROTO_DONE);
 712         }
 713         if (cscov_partial) {
 714                 struct udpcb *up;
 715
 716                 up = intoudpcb(inp);
 717                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 718                         INP_RUNLOCK(inp);
 719                         m_freem(m);
 720                         return (IPPROTO_DONE);
 721                 }
 722         }
 723
 724         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 725         if (udp_append(inp, ip, m, iphlen, udp_in) == 0)
 726                 INP_RUNLOCK(inp);
 727         return (IPPROTO_DONE);
 728
 729 badunlocked:
 730         m_freem(m);
 731         return (IPPROTO_DONE);
 732 }
 733 #endif /* INET */
 734
 735 /*
 736  * Notify a udp user of an asynchronous error; just wake up so that they can
 737  * collect error status.
 738  */
 739 struct inpcb *
 740 udp_notify(struct inpcb *inp, int errno)
 741 {
 742
 743         /*
 744          * While udp_ctlinput() always calls udp_notify() with a read lock
 745          * when invoking it directly, in_pcbnotifyall() currently uses write
 746          * locks due to sharing code with TCP.  For now, accept either a read
 747          * or a write lock, but a read lock is sufficient.
 748          */
 749         INP_LOCK_ASSERT(inp);
 750         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 751              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 752                 RTFREE(inp->inp_route.ro_rt);
 753                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 754         }
 755
 756         inp->inp_socket->so_error = errno;
 757         sorwakeup(inp->inp_socket);
 758         sowwakeup(inp->inp_socket);
 759         return (inp);
 760 }
 761
 762 #ifdef INET
 763 static void
 764 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 765     struct inpcbinfo *pcbinfo)
 766 {
 767         struct ip *ip = vip;
 768         struct udphdr *uh;
 769         struct in_addr faddr;
 770         struct inpcb *inp;
 771
 772         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 773         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 774                 return;
 775
 776         if (PRC_IS_REDIRECT(cmd)) {
 777                 /* signal EHOSTDOWN, as it flushes the cached route */
 778                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 779                 return;
 780         }
 781
 782         /*
 783          * Hostdead is ugly because it goes linearly through all PCBs.
 784          *
 785          * XXX: We never get this from ICMP, otherwise it makes an excellent
 786          * DoS attack on machines with many connections.
 787          */
 788         if (cmd == PRC_HOSTDEAD)
 789                 ip = NULL;
 790         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 791                 return;
 792         if (ip != NULL) {
 793                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 794                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 795                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 796                 if (inp != NULL) {
 797                         INP_RLOCK_ASSERT(inp);
 798                         if (inp->inp_socket != NULL) {
 799                                 udp_notify(inp, inetctlerrmap[cmd]);
 800                         }
 801                         INP_RUNLOCK(inp);
 802                 } else {
 803                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 804                                            ip->ip_src, uh->uh_sport,
 805                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 806                         if (inp != NULL) {
 807                                 struct udpcb *up;
 808                                 void *ctx;
 809                                 udp_tun_icmp_t func;
 810
 811                                 up = intoudpcb(inp);
 812                                 ctx = up->u_tun_ctx;
 813                                 func = up->u_icmp_func;
 814                                 INP_RUNLOCK(inp);
 815                                 if (func != NULL)
 816                                         (*func)(cmd, sa, vip, ctx);
 817                         }
 818                 }
 819         } else
 820                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 821                     udp_notify);
 822 }
 823 void
 824 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 825 {
 826
 827         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 828 }
 829
 830 void
 831 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 832 {
 833
 834         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 835 }
 836 #endif /* INET */
 837
 838 static int
 839 udp_pcblist(SYSCTL_HANDLER_ARGS)
 840 {
 841         int error, i, n;
 842         struct inpcb *inp, **inp_list;
 843         inp_gen_t gencnt;
 844         struct xinpgen xig;
 845         struct epoch_tracker et;
 846
 847         /*
 848          * The process of preparing the PCB list is too time-consuming and
 849          * resource-intensive to repeat twice on every request.
 850          */
 851         if (req->oldptr == 0) {
 852                 n = V_udbinfo.ipi_count;
 853                 n += imax(n / 8, 10);
 854                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 855                 return (0);
 856         }
 857
 858         if (req->newptr != 0)
 859                 return (EPERM);
 860
 861         /*
 862          * OK, now we're committed to doing something.
 863          */
 864         INP_INFO_RLOCK_ET(&V_udbinfo, et);
 865         gencnt = V_udbinfo.ipi_gencnt;
 866         n = V_udbinfo.ipi_count;
 867         INP_INFO_RUNLOCK_ET(&V_udbinfo, et);
 868
 869         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 870                 + n * sizeof(struct xinpcb));
 871         if (error != 0)
 872                 return (error);
 873
 874         xig.xig_len = sizeof xig;
 875         xig.xig_count = n;
 876         xig.xig_gen = gencnt;
 877         xig.xig_sogen = so_gencnt;
 878         error = SYSCTL_OUT(req, &xig, sizeof xig);
 879         if (error)
 880                 return (error);
 881
 882         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 883         if (inp_list == NULL)
 884                 return (ENOMEM);
 885
 886         INP_INFO_RLOCK_ET(&V_udbinfo, et);
 887         for (inp = CK_LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 888              inp = CK_LIST_NEXT(inp, inp_list)) {
 889                 INP_WLOCK(inp);
 890                 if (inp->inp_gencnt <= gencnt &&
 891                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 892                         in_pcbref(inp);
 893                         inp_list[i++] = inp;
 894                 }
 895                 INP_WUNLOCK(inp);
 896         }
 897         INP_INFO_RUNLOCK_ET(&V_udbinfo, et);
 898         n = i;
 899
 900         error = 0;
 901         for (i = 0; i < n; i++) {
 902                 inp = inp_list[i];
 903                 INP_RLOCK(inp);
 904                 if (inp->inp_gencnt <= gencnt) {
 905                         struct xinpcb xi;
 906
 907                         in_pcbtoxinpcb(inp, &xi);
 908                         INP_RUNLOCK(inp);
 909                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 910                 } else
 911                         INP_RUNLOCK(inp);
 912         }
 913         INP_INFO_WLOCK(&V_udbinfo);
 914         for (i = 0; i < n; i++) {
 915                 inp = inp_list[i];
 916                 INP_RLOCK(inp);
 917                 if (!in_pcbrele_rlocked(inp))
 918                         INP_RUNLOCK(inp);
 919         }
 920         INP_INFO_WUNLOCK(&V_udbinfo);
 921
 922         if (!error) {
 923                 /*
 924                  * Give the user an updated idea of our state.  If the
 925                  * generation differs from what we told her before, she knows
 926                  * that something happened while we were processing this
 927                  * request, and it might be necessary to retry.
 928                  */
 929                 INP_INFO_RLOCK_ET(&V_udbinfo, et);
 930                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 931                 xig.xig_sogen = so_gencnt;
 932                 xig.xig_count = V_udbinfo.ipi_count;
 933                 INP_INFO_RUNLOCK_ET(&V_udbinfo, et);
 934                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 935         }
 936         free(inp_list, M_TEMP);
 937         return (error);
 938 }
 939
 940 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 941     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 942     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 943
 944 #ifdef INET
 945 static int
 946 udp_getcred(SYSCTL_HANDLER_ARGS)
 947 {
 948         struct xucred xuc;
 949         struct sockaddr_in addrs[2];
 950         struct inpcb *inp;
 951         int error;
 952
 953         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 954         if (error)
 955                 return (error);
 956         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 957         if (error)
 958                 return (error);
 959         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 960             addrs[0].sin_addr, addrs[0].sin_port,
 961             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 962         if (inp != NULL) {
 963                 INP_RLOCK_ASSERT(inp);
 964                 if (inp->inp_socket == NULL)
 965                         error = ENOENT;
 966                 if (error == 0)
 967                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 968                 if (error == 0)
 969                         cru2x(inp->inp_cred, &xuc);
 970                 INP_RUNLOCK(inp);
 971         } else
 972                 error = ENOENT;
 973         if (error == 0)
 974                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 975         return (error);
 976 }
 977
 978 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 979     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 980     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 981 #endif /* INET */
 982
 983 int
 984 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 985 {
 986         struct inpcb *inp;
 987         struct udpcb *up;
 988         int isudplite, error, optval;
 989
 990         error = 0;
 991         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 992         inp = sotoinpcb(so);
 993         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 994         INP_WLOCK(inp);
 995         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 996 #ifdef INET6
 997                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 998                         INP_WUNLOCK(inp);
 999                         error = ip6_ctloutput(so, sopt);
1000                 }
1001 #endif
1002 #if defined(INET) && defined(INET6)
1003                 else
1004 #endif
1005 #ifdef INET
1006                 {
1007                         INP_WUNLOCK(inp);
1008                         error = ip_ctloutput(so, sopt);
1009                 }
1010 #endif
1011                 return (error);
1012         }
1013
1014         switch (sopt->sopt_dir) {
1015         case SOPT_SET:
1016                 switch (sopt->sopt_name) {
1017 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1018 #ifdef INET
1019                 case UDP_ENCAP:
1020                         if (!IPSEC_ENABLED(ipv4)) {
1021                                 INP_WUNLOCK(inp);
1022                                 return (ENOPROTOOPT);
1023                         }
1024                         error = UDPENCAP_PCBCTL(inp, sopt);
1025                         break;
1026 #endif /* INET */
1027 #endif /* IPSEC */
1028                 case UDPLITE_SEND_CSCOV:
1029                 case UDPLITE_RECV_CSCOV:
1030                         if (!isudplite) {
1031                                 INP_WUNLOCK(inp);
1032                                 error = ENOPROTOOPT;
1033                                 break;
1034                         }
1035                         INP_WUNLOCK(inp);
1036                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1037                             sizeof(optval));
1038                         if (error != 0)
1039                                 break;
1040                         inp = sotoinpcb(so);
1041                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1042                         INP_WLOCK(inp);
1043                         up = intoudpcb(inp);
1044                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1045                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1046                                 INP_WUNLOCK(inp);
1047                                 error = EINVAL;
1048                                 break;
1049                         }
1050                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1051                                 up->u_txcslen = optval;
1052                         else
1053                                 up->u_rxcslen = optval;
1054                         INP_WUNLOCK(inp);
1055                         break;
1056                 default:
1057                         INP_WUNLOCK(inp);
1058                         error = ENOPROTOOPT;
1059                         break;
1060                 }
1061                 break;
1062         case SOPT_GET:
1063                 switch (sopt->sopt_name) {
1064 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1065 #ifdef INET
1066                 case UDP_ENCAP:
1067                         if (!IPSEC_ENABLED(ipv4)) {
1068                                 INP_WUNLOCK(inp);
1069                                 return (ENOPROTOOPT);
1070                         }
1071                         error = UDPENCAP_PCBCTL(inp, sopt);
1072                         break;
1073 #endif /* INET */
1074 #endif /* IPSEC */
1075                 case UDPLITE_SEND_CSCOV:
1076                 case UDPLITE_RECV_CSCOV:
1077                         if (!isudplite) {
1078                                 INP_WUNLOCK(inp);
1079                                 error = ENOPROTOOPT;
1080                                 break;
1081                         }
1082                         up = intoudpcb(inp);
1083                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1084                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1085                                 optval = up->u_txcslen;
1086                         else
1087                                 optval = up->u_rxcslen;
1088                         INP_WUNLOCK(inp);
1089                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1090                         break;
1091                 default:
1092                         INP_WUNLOCK(inp);
1093                         error = ENOPROTOOPT;
1094                         break;
1095                 }
1096                 break;
1097         }
1098         return (error);
1099 }
1100
1101 #ifdef INET
1102 #define UH_WLOCKED      2
1103 #define UH_RLOCKED      1
1104 #define UH_UNLOCKED     0
1105 static int
1106 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1107     struct mbuf *control, struct thread *td)
1108 {
1109         struct udpiphdr *ui;
1110         int len = m->m_pkthdr.len;
1111         struct in_addr faddr, laddr;
1112         struct cmsghdr *cm;
1113         struct inpcbinfo *pcbinfo;
1114         struct sockaddr_in *sin, src;
1115         struct epoch_tracker et;
1116         int cscov_partial = 0;
1117         int error = 0;
1118         int ipflags;
1119         u_short fport, lport;
1120         int unlock_udbinfo, unlock_inp;
1121         u_char tos;
1122         uint8_t pr;
1123         uint16_t cscov = 0;
1124         uint32_t flowid = 0;
1125         uint8_t flowtype = M_HASHTYPE_NONE;
1126
1127         /*
1128          * udp_output() may need to temporarily bind or connect the current
1129          * inpcb.  As such, we don't know up front whether we will need the
1130          * pcbinfo lock or not.  Do any work to decide what is needed up
1131          * front before acquiring any locks.
1132          */
1133         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1134                 if (control)
1135                         m_freem(control);
1136                 m_freem(m);
1137                 return (EMSGSIZE);
1138         }
1139
1140         src.sin_family = 0;
1141         sin = (struct sockaddr_in *)addr;
1142         if (sin == NULL ||
1143             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1144                 INP_WLOCK(inp);
1145                 unlock_inp = UH_WLOCKED;
1146         } else {
1147                 INP_RLOCK(inp);
1148                 unlock_inp = UH_RLOCKED;
1149         }
1150         tos = inp->inp_ip_tos;
1151         if (control != NULL) {
1152                 /*
1153                  * XXX: Currently, we assume all the optional information is
1154                  * stored in a single mbuf.
1155                  */
1156                 if (control->m_next) {
1157                         if (unlock_inp == UH_WLOCKED)
1158                                 INP_WUNLOCK(inp);
1159                         else
1160                                 INP_RUNLOCK(inp);
1161                         m_freem(control);
1162                         m_freem(m);
1163                         return (EINVAL);
1164                 }
1165                 for (; control->m_len > 0;
1166                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1167                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1168                         cm = mtod(control, struct cmsghdr *);
1169                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1170                             || cm->cmsg_len > control->m_len) {
1171                                 error = EINVAL;
1172                                 break;
1173                         }
1174                         if (cm->cmsg_level != IPPROTO_IP)
1175                                 continue;
1176
1177                         switch (cm->cmsg_type) {
1178                         case IP_SENDSRCADDR:
1179                                 if (cm->cmsg_len !=
1180                                     CMSG_LEN(sizeof(struct in_addr))) {
1181                                         error = EINVAL;
1182                                         break;
1183                                 }
1184                                 bzero(&src, sizeof(src));
1185                                 src.sin_family = AF_INET;
1186                                 src.sin_len = sizeof(src);
1187                                 src.sin_port = inp->inp_lport;
1188                                 src.sin_addr =
1189                                     *(struct in_addr *)CMSG_DATA(cm);
1190                                 break;
1191
1192                         case IP_TOS:
1193                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1194                                         error = EINVAL;
1195                                         break;
1196                                 }
1197                                 tos = *(u_char *)CMSG_DATA(cm);
1198                                 break;
1199
1200                         case IP_FLOWID:
1201                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1202                                         error = EINVAL;
1203                                         break;
1204                                 }
1205                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1206                                 break;
1207
1208                         case IP_FLOWTYPE:
1209                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1210                                         error = EINVAL;
1211                                         break;
1212                                 }
1213                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1214                                 break;
1215
1216 #ifdef  RSS
1217                         case IP_RSSBUCKETID:
1218                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1219                                         error = EINVAL;
1220                                         break;
1221                                 }
1222                                 /* This is just a placeholder for now */
1223                                 break;
1224 #endif  /* RSS */
1225                         default:
1226                                 error = ENOPROTOOPT;
1227                                 break;
1228                         }
1229                         if (error)
1230                                 break;
1231                 }
1232                 m_freem(control);
1233         }
1234         if (error) {
1235                 if (unlock_inp == UH_WLOCKED)
1236                         INP_WUNLOCK(inp);
1237                 else
1238                         INP_RUNLOCK(inp);
1239                 m_freem(m);
1240                 return (error);
1241         }
1242
1243         /*
1244          * Depending on whether or not the application has bound or connected
1245          * the socket, we may have to do varying levels of work.  The optimal
1246          * case is for a connected UDP socket, as a global lock isn't
1247          * required at all.
1248          *
1249          * In order to decide which we need, we require stability of the
1250          * inpcb binding, which we ensure by acquiring a read lock on the
1251          * inpcb.  This doesn't strictly follow the lock order, so we play
1252          * the trylock and retry game; note that we may end up with more
1253          * conservative locks than required the second time around, so later
1254          * assertions have to accept that.  Further analysis of the number of
1255          * misses under contention is required.
1256          *
1257          * XXXRW: Check that hash locking update here is correct.
1258          */
1259         pr = inp->inp_socket->so_proto->pr_protocol;
1260         pcbinfo = udp_get_inpcbinfo(pr);
1261         sin = (struct sockaddr_in *)addr;
1262         if (sin != NULL &&
1263             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1264                 INP_HASH_WLOCK(pcbinfo);
1265                 unlock_udbinfo = UH_WLOCKED;
1266         } else if ((sin != NULL && (
1267             (sin->sin_addr.s_addr == INADDR_ANY) ||
1268             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1269             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1270             (inp->inp_lport == 0))) ||
1271             (src.sin_family == AF_INET)) {
1272                 INP_HASH_RLOCK_ET(pcbinfo, et);
1273                 unlock_udbinfo = UH_RLOCKED;
1274         } else
1275                 unlock_udbinfo = UH_UNLOCKED;
1276
1277         /*
1278          * If the IP_SENDSRCADDR control message was specified, override the
1279          * source address for this datagram.  Its use is invalidated if the
1280          * address thus specified is incomplete or clobbers other inpcbs.
1281          */
1282         laddr = inp->inp_laddr;
1283         lport = inp->inp_lport;
1284         if (src.sin_family == AF_INET) {
1285                 INP_HASH_LOCK_ASSERT(pcbinfo);
1286                 if ((lport == 0) ||
1287                     (laddr.s_addr == INADDR_ANY &&
1288                      src.sin_addr.s_addr == INADDR_ANY)) {
1289                         error = EINVAL;
1290                         goto release;
1291                 }
1292                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1293                     &laddr.s_addr, &lport, td->td_ucred);
1294                 if (error)
1295                         goto release;
1296         }
1297
1298         /*
1299          * If a UDP socket has been connected, then a local address/port will
1300          * have been selected and bound.
1301          *
1302          * If a UDP socket has not been connected to, then an explicit
1303          * destination address must be used, in which case a local
1304          * address/port may not have been selected and bound.
1305          */
1306         if (sin != NULL) {
1307                 INP_LOCK_ASSERT(inp);
1308                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1309                         error = EISCONN;
1310                         goto release;
1311                 }
1312
1313                 /*
1314                  * Jail may rewrite the destination address, so let it do
1315                  * that before we use it.
1316                  */
1317                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1318                 if (error)
1319                         goto release;
1320
1321                 /*
1322                  * If a local address or port hasn't yet been selected, or if
1323                  * the destination address needs to be rewritten due to using
1324                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1325                  * to do the heavy lifting.  Once a port is selected, we
1326                  * commit the binding back to the socket; we also commit the
1327                  * binding of the address if in jail.
1328                  *
1329                  * If we already have a valid binding and we're not
1330                  * requesting a destination address rewrite, use a fast path.
1331                  */
1332                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1333                     inp->inp_lport == 0 ||
1334                     sin->sin_addr.s_addr == INADDR_ANY ||
1335                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1336                         INP_HASH_LOCK_ASSERT(pcbinfo);
1337                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1338                             &lport, &faddr.s_addr, &fport, NULL,
1339                             td->td_ucred);
1340                         if (error)
1341                                 goto release;
1342
1343                         /*
1344                          * XXXRW: Why not commit the port if the address is
1345                          * !INADDR_ANY?
1346                          */
1347                         /* Commit the local port if newly assigned. */
1348                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1349                             inp->inp_lport == 0) {
1350                                 INP_WLOCK_ASSERT(inp);
1351                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1352                                 /*
1353                                  * Remember addr if jailed, to prevent
1354                                  * rebinding.
1355                                  */
1356                                 if (prison_flag(td->td_ucred, PR_IP4))
1357                                         inp->inp_laddr = laddr;
1358                                 inp->inp_lport = lport;
1359                                 if (in_pcbinshash(inp) != 0) {
1360                                         inp->inp_lport = 0;
1361                                         error = EAGAIN;
1362                                         goto release;
1363                                 }
1364                                 inp->inp_flags |= INP_ANONPORT;
1365                         }
1366                 } else {
1367                         faddr = sin->sin_addr;
1368                         fport = sin->sin_port;
1369                 }
1370         } else {
1371                 INP_LOCK_ASSERT(inp);
1372                 faddr = inp->inp_faddr;
1373                 fport = inp->inp_fport;
1374                 if (faddr.s_addr == INADDR_ANY) {
1375                         error = ENOTCONN;
1376                         goto release;
1377                 }
1378         }
1379
1380         /*
1381          * Calculate data length and get a mbuf for UDP, IP, and possible
1382          * link-layer headers.  Immediate slide the data pointer back forward
1383          * since we won't use that space at this layer.
1384          */
1385         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1386         if (m == NULL) {
1387                 error = ENOBUFS;
1388                 goto release;
1389         }
1390         m->m_data += max_linkhdr;
1391         m->m_len -= max_linkhdr;
1392         m->m_pkthdr.len -= max_linkhdr;
1393
1394         /*
1395          * Fill in mbuf with extended UDP header and addresses and length put
1396          * into network format.
1397          */
1398         ui = mtod(m, struct udpiphdr *);
1399         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1400         ui->ui_v = IPVERSION << 4;
1401         ui->ui_pr = pr;
1402         ui->ui_src = laddr;
1403         ui->ui_dst = faddr;
1404         ui->ui_sport = lport;
1405         ui->ui_dport = fport;
1406         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1407         if (pr == IPPROTO_UDPLITE) {
1408                 struct udpcb *up;
1409                 uint16_t plen;
1410
1411                 up = intoudpcb(inp);
1412                 cscov = up->u_txcslen;
1413                 plen = (u_short)len + sizeof(struct udphdr);
1414                 if (cscov >= plen)
1415                         cscov = 0;
1416                 ui->ui_len = htons(plen);
1417                 ui->ui_ulen = htons(cscov);
1418                 /*
1419                  * For UDP-Lite, checksum coverage length of zero means
1420                  * the entire UDPLite packet is covered by the checksum.
1421                  */
1422                 cscov_partial = (cscov == 0) ? 0 : 1;
1423         }
1424
1425         /*
1426          * Set the Don't Fragment bit in the IP header.
1427          */
1428         if (inp->inp_flags & INP_DONTFRAG) {
1429                 struct ip *ip;
1430
1431                 ip = (struct ip *)&ui->ui_i;
1432                 ip->ip_off |= htons(IP_DF);
1433         }
1434
1435         ipflags = 0;
1436         if (inp->inp_socket->so_options & SO_DONTROUTE)
1437                 ipflags |= IP_ROUTETOIF;
1438         if (inp->inp_socket->so_options & SO_BROADCAST)
1439                 ipflags |= IP_ALLOWBROADCAST;
1440         if (inp->inp_flags & INP_ONESBCAST)
1441                 ipflags |= IP_SENDONES;
1442
1443 #ifdef MAC
1444         mac_inpcb_create_mbuf(inp, m);
1445 #endif
1446
1447         /*
1448          * Set up checksum and output datagram.
1449          */
1450         ui->ui_sum = 0;
1451         if (pr == IPPROTO_UDPLITE) {
1452                 if (inp->inp_flags & INP_ONESBCAST)
1453                         faddr.s_addr = INADDR_BROADCAST;
1454                 if (cscov_partial) {
1455                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1456                                 ui->ui_sum = 0xffff;
1457                 } else {
1458                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1459                                 ui->ui_sum = 0xffff;
1460                 }
1461         } else if (V_udp_cksum) {
1462                 if (inp->inp_flags & INP_ONESBCAST)
1463                         faddr.s_addr = INADDR_BROADCAST;
1464                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1465                     htons((u_short)len + sizeof(struct udphdr) + pr));
1466                 m->m_pkthdr.csum_flags = CSUM_UDP;
1467                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1468         }
1469         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1470         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1471         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1472         UDPSTAT_INC(udps_opackets);
1473
1474         /*
1475          * Setup flowid / RSS information for outbound socket.
1476          *
1477          * Once the UDP code decides to set a flowid some other way,
1478          * this allows the flowid to be overridden by userland.
1479          */
1480         if (flowtype != M_HASHTYPE_NONE) {
1481                 m->m_pkthdr.flowid = flowid;
1482                 M_HASHTYPE_SET(m, flowtype);
1483 #ifdef  RSS
1484         } else {
1485                 uint32_t hash_val, hash_type;
1486                 /*
1487                  * Calculate an appropriate RSS hash for UDP and
1488                  * UDP Lite.
1489                  *
1490                  * The called function will take care of figuring out
1491                  * whether a 2-tuple or 4-tuple hash is required based
1492                  * on the currently configured scheme.
1493                  *
1494                  * Later later on connected socket values should be
1495                  * cached in the inpcb and reused, rather than constantly
1496                  * re-calculating it.
1497                  *
1498                  * UDP Lite is a different protocol number and will
1499                  * likely end up being hashed as a 2-tuple until
1500                  * RSS / NICs grow UDP Lite protocol awareness.
1501                  */
1502                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1503                     pr, &hash_val, &hash_type) == 0) {
1504                         m->m_pkthdr.flowid = hash_val;
1505                         M_HASHTYPE_SET(m, hash_type);
1506                 }
1507 #endif
1508         }
1509
1510 #ifdef  RSS
1511         /*
1512          * Don't override with the inp cached flowid value.
1513          *
1514          * Depending upon the kind of send being done, the inp
1515          * flowid/flowtype values may actually not be appropriate
1516          * for this particular socket send.
1517          *
1518          * We should either leave the flowid at zero (which is what is
1519          * currently done) or set it to some software generated
1520          * hash value based on the packet contents.
1521          */
1522         ipflags |= IP_NODEFAULTFLOWID;
1523 #endif  /* RSS */
1524
1525         if (unlock_udbinfo == UH_WLOCKED)
1526                 INP_HASH_WUNLOCK(pcbinfo);
1527         else if (unlock_udbinfo == UH_RLOCKED)
1528                 INP_HASH_RUNLOCK_ET(pcbinfo, et);
1529         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1530         error = ip_output(m, inp->inp_options,
1531             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1532             inp->inp_moptions, inp);
1533         if (unlock_inp == UH_WLOCKED)
1534                 INP_WUNLOCK(inp);
1535         else
1536                 INP_RUNLOCK(inp);
1537         return (error);
1538
1539 release:
1540         if (unlock_udbinfo == UH_WLOCKED) {
1541                 KASSERT(unlock_inp == UH_WLOCKED,
1542                     ("%s: excl udbinfo lock, shared inp lock", __func__));
1543                 INP_HASH_WUNLOCK(pcbinfo);
1544                 INP_WUNLOCK(inp);
1545         } else if (unlock_udbinfo == UH_RLOCKED) {
1546                 KASSERT(unlock_inp == UH_RLOCKED,
1547                     ("%s: shared udbinfo lock, excl inp lock", __func__));
1548                 INP_HASH_RUNLOCK_ET(pcbinfo, et);
1549                 INP_RUNLOCK(inp);
1550         } else if (unlock_inp == UH_WLOCKED)
1551                 INP_WUNLOCK(inp);
1552         else
1553                 INP_RUNLOCK(inp);
1554         m_freem(m);
1555         return (error);
1556 }
1557
1558 static void
1559 udp_abort(struct socket *so)
1560 {
1561         struct inpcb *inp;
1562         struct inpcbinfo *pcbinfo;
1563
1564         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1565         inp = sotoinpcb(so);
1566         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1567         INP_WLOCK(inp);
1568         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1569                 INP_HASH_WLOCK(pcbinfo);
1570                 in_pcbdisconnect(inp);
1571                 inp->inp_laddr.s_addr = INADDR_ANY;
1572                 INP_HASH_WUNLOCK(pcbinfo);
1573                 soisdisconnected(so);
1574         }
1575         INP_WUNLOCK(inp);
1576 }
1577
1578 static int
1579 udp_attach(struct socket *so, int proto, struct thread *td)
1580 {
1581         static uint32_t udp_flowid;
1582         struct inpcb *inp;
1583         struct inpcbinfo *pcbinfo;
1584         int error;
1585
1586         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1587         inp = sotoinpcb(so);
1588         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1589         error = soreserve(so, udp_sendspace, udp_recvspace);
1590         if (error)
1591                 return (error);
1592         INP_INFO_WLOCK(pcbinfo);
1593         error = in_pcballoc(so, pcbinfo);
1594         if (error) {
1595                 INP_INFO_WUNLOCK(pcbinfo);
1596                 return (error);
1597         }
1598
1599         inp = sotoinpcb(so);
1600         inp->inp_vflag |= INP_IPV4;
1601         inp->inp_ip_ttl = V_ip_defttl;
1602         inp->inp_flowid = atomic_fetchadd_int(&udp_flowid, 1);
1603         inp->inp_flowtype = M_HASHTYPE_OPAQUE;
1604
1605         error = udp_newudpcb(inp);
1606         if (error) {
1607                 in_pcbdetach(inp);
1608                 in_pcbfree(inp);
1609                 INP_INFO_WUNLOCK(pcbinfo);
1610                 return (error);
1611         }
1612
1613         INP_WUNLOCK(inp);
1614         INP_INFO_WUNLOCK(pcbinfo);
1615         return (0);
1616 }
1617 #endif /* INET */
1618
1619 int
1620 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1621 {
1622         struct inpcb *inp;
1623         struct udpcb *up;
1624
1625         KASSERT(so->so_type == SOCK_DGRAM,
1626             ("udp_set_kernel_tunneling: !dgram"));
1627         inp = sotoinpcb(so);
1628         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1629         INP_WLOCK(inp);
1630         up = intoudpcb(inp);
1631         if ((up->u_tun_func != NULL) ||
1632             (up->u_icmp_func != NULL)) {
1633                 INP_WUNLOCK(inp);
1634                 return (EBUSY);
1635         }
1636         up->u_tun_func = f;
1637         up->u_icmp_func = i;
1638         up->u_tun_ctx = ctx;
1639         INP_WUNLOCK(inp);
1640         return (0);
1641 }
1642
1643 #ifdef INET
1644 static int
1645 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1646 {
1647         struct inpcb *inp;
1648         struct inpcbinfo *pcbinfo;
1649         int error;
1650
1651         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1652         inp = sotoinpcb(so);
1653         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1654         INP_WLOCK(inp);
1655         INP_HASH_WLOCK(pcbinfo);
1656         error = in_pcbbind(inp, nam, td->td_ucred);
1657         INP_HASH_WUNLOCK(pcbinfo);
1658         INP_WUNLOCK(inp);
1659         return (error);
1660 }
1661
1662 static void
1663 udp_close(struct socket *so)
1664 {
1665         struct inpcb *inp;
1666         struct inpcbinfo *pcbinfo;
1667
1668         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1669         inp = sotoinpcb(so);
1670         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1671         INP_WLOCK(inp);
1672         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1673                 INP_HASH_WLOCK(pcbinfo);
1674                 in_pcbdisconnect(inp);
1675                 inp->inp_laddr.s_addr = INADDR_ANY;
1676                 INP_HASH_WUNLOCK(pcbinfo);
1677                 soisdisconnected(so);
1678         }
1679         INP_WUNLOCK(inp);
1680 }
1681
1682 static int
1683 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1684 {
1685         struct inpcb *inp;
1686         struct inpcbinfo *pcbinfo;
1687         struct sockaddr_in *sin;
1688         int error;
1689
1690         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1691         inp = sotoinpcb(so);
1692         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1693         INP_WLOCK(inp);
1694         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1695                 INP_WUNLOCK(inp);
1696                 return (EISCONN);
1697         }
1698         sin = (struct sockaddr_in *)nam;
1699         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1700         if (error != 0) {
1701                 INP_WUNLOCK(inp);
1702                 return (error);
1703         }
1704         INP_HASH_WLOCK(pcbinfo);
1705         error = in_pcbconnect(inp, nam, td->td_ucred);
1706         INP_HASH_WUNLOCK(pcbinfo);
1707         if (error == 0)
1708                 soisconnected(so);
1709         INP_WUNLOCK(inp);
1710         return (error);
1711 }
1712
1713 static void
1714 udp_detach(struct socket *so)
1715 {
1716         struct inpcb *inp;
1717         struct inpcbinfo *pcbinfo;
1718         struct udpcb *up;
1719
1720         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1721         inp = sotoinpcb(so);
1722         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1723         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1724             ("udp_detach: not disconnected"));
1725         INP_INFO_WLOCK(pcbinfo);
1726         INP_WLOCK(inp);
1727         up = intoudpcb(inp);
1728         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1729         inp->inp_ppcb = NULL;
1730         in_pcbdetach(inp);
1731         in_pcbfree(inp);
1732         INP_INFO_WUNLOCK(pcbinfo);
1733         udp_discardcb(up);
1734 }
1735
1736 static int
1737 udp_disconnect(struct socket *so)
1738 {
1739         struct inpcb *inp;
1740         struct inpcbinfo *pcbinfo;
1741
1742         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1743         inp = sotoinpcb(so);
1744         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1745         INP_WLOCK(inp);
1746         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1747                 INP_WUNLOCK(inp);
1748                 return (ENOTCONN);
1749         }
1750         INP_HASH_WLOCK(pcbinfo);
1751         in_pcbdisconnect(inp);
1752         inp->inp_laddr.s_addr = INADDR_ANY;
1753         INP_HASH_WUNLOCK(pcbinfo);
1754         SOCK_LOCK(so);
1755         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1756         SOCK_UNLOCK(so);
1757         INP_WUNLOCK(inp);
1758         return (0);
1759 }
1760
1761 static int
1762 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1763     struct mbuf *control, struct thread *td)
1764 {
1765         struct inpcb *inp;
1766
1767         inp = sotoinpcb(so);
1768         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1769         return (udp_output(inp, m, addr, control, td));
1770 }
1771 #endif /* INET */
1772
1773 int
1774 udp_shutdown(struct socket *so)
1775 {
1776         struct inpcb *inp;
1777
1778         inp = sotoinpcb(so);
1779         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1780         INP_WLOCK(inp);
1781         socantsendmore(so);
1782         INP_WUNLOCK(inp);
1783         return (0);
1784 }
1785
1786 #ifdef INET
1787 struct pr_usrreqs udp_usrreqs = {
1788         .pru_abort =            udp_abort,
1789         .pru_attach =           udp_attach,
1790         .pru_bind =             udp_bind,
1791         .pru_connect =          udp_connect,
1792         .pru_control =          in_control,
1793         .pru_detach =           udp_detach,
1794         .pru_disconnect =       udp_disconnect,
1795         .pru_peeraddr =         in_getpeeraddr,
1796         .pru_send =             udp_send,
1797         .pru_soreceive =        soreceive_dgram,
1798         .pru_sosend =           sosend_dgram,
1799         .pru_shutdown =         udp_shutdown,
1800         .pru_sockaddr =         in_getsockaddr,
1801         .pru_sosetlabel =       in_pcbsosetlabel,
1802         .pru_close =            udp_close,
1803 };
1804 #endif /* INET */