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