sys/netinet/udp_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2008 Robert N. M. Watson
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * Copyright (c) 2014 Kevin Lo
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed by Robert N. M. Watson under
  10  * contract to Juniper Networks, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include "opt_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_ipsec.h"
  45 #include "opt_rss.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/domain.h>
  49 #include <sys/eventhandler.h>
  50 #include <sys/jail.h>
  51 #include <sys/kernel.h>
  52 #include <sys/lock.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/priv.h>
  56 #include <sys/proc.h>
  57 #include <sys/protosw.h>
  58 #include <sys/sdt.h>
  59 #include <sys/signalvar.h>
  60 #include <sys/socket.h>
  61 #include <sys/socketvar.h>
  62 #include <sys/sx.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/syslog.h>
  65 #include <sys/systm.h>
  66
  67 #include <vm/uma.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_var.h>
  71 #include <net/route.h>
  72 #include <net/rss_config.h>
  73
  74 #include <netinet/in.h>
  75 #include <netinet/in_kdtrace.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/in_var.h>
  79 #include <netinet/ip.h>
  80 #ifdef INET6
  81 #include <netinet/ip6.h>
  82 #endif
  83 #include <netinet/ip_icmp.h>
  84 #include <netinet/icmp_var.h>
  85 #include <netinet/ip_var.h>
  86 #include <netinet/ip_options.h>
  87 #ifdef INET6
  88 #include <netinet6/ip6_var.h>
  89 #endif
  90 #include <netinet/udp.h>
  91 #include <netinet/udp_var.h>
  92 #include <netinet/udplite.h>
  93 #include <netinet/in_rss.h>
  94
  95 #include <netipsec/ipsec_support.h>
  96
  97 #include <machine/in_cksum.h>
  98
  99 #include <security/mac/mac_framework.h>
 100
 101 /*
 102  * UDP and UDP-Lite protocols implementation.
 103  * Per RFC 768, August, 1980.
 104  * Per RFC 3828, July, 2004.
 105  */
 106
 107 /*
 108  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 109  * removes the only data integrity mechanism for packets and malformed
 110  * packets that would otherwise be discarded due to bad checksums, and may
 111  * cause problems (especially for NFS data blocks).
 112  */
 113 VNET_DEFINE(int, udp_cksum) = 1;
 114 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 115     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 116
 117 int     udp_log_in_vain = 0;
 118 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 119     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 120
 121 VNET_DEFINE(int, udp_blackhole) = 0;
 122 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 123     &VNET_NAME(udp_blackhole), 0,
 124     "Do not send port unreachables for refused connects");
 125
 126 u_long  udp_sendspace = 9216;           /* really max datagram size */
 127 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 128     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 129
 130 u_long  udp_recvspace = 40 * (1024 +
 131 #ifdef INET6
 132                                       sizeof(struct sockaddr_in6)
 133 #else
 134                                       sizeof(struct sockaddr_in)
 135 #endif
 136                                       );        /* 40 1K datagrams */
 137
 138 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 139     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 140
 141 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 142 VNET_DEFINE(struct inpcbinfo, udbinfo);
 143 VNET_DEFINE(struct inpcbhead, ulitecb);
 144 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 145 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 146 #define V_udpcb_zone                    VNET(udpcb_zone)
 147
 148 #ifndef UDBHASHSIZE
 149 #define UDBHASHSIZE     128
 150 #endif
 151
 152 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 153 VNET_PCPUSTAT_SYSINIT(udpstat);
 154 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 155     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 156
 157 #ifdef VIMAGE
 158 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 159 #endif /* VIMAGE */
 160 #ifdef INET
 161 static void     udp_detach(struct socket *so);
 162 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 163                     struct mbuf *, struct thread *);
 164 #endif
 165
 166 static void
 167 udp_zone_change(void *tag)
 168 {
 169
 170         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 171         uma_zone_set_max(V_udpcb_zone, maxsockets);
 172 }
 173
 174 static int
 175 udp_inpcb_init(void *mem, int size, int flags)
 176 {
 177         struct inpcb *inp;
 178
 179         inp = mem;
 180         INP_LOCK_INIT(inp, "inp", "udpinp");
 181         return (0);
 182 }
 183
 184 static int
 185 udplite_inpcb_init(void *mem, int size, int flags)
 186 {
 187         struct inpcb *inp;
 188
 189         inp = mem;
 190         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 191         return (0);
 192 }
 193
 194 void
 195 udp_init(void)
 196 {
 197
 198         /*
 199          * For now default to 2-tuple UDP hashing - until the fragment
 200          * reassembly code can also update the flowid.
 201          *
 202          * Once we can calculate the flowid that way and re-establish
 203          * a 4-tuple, flip this to 4-tuple.
 204          */
 205         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 206             "udp_inpcb", udp_inpcb_init, IPI_HASHFIELDS_2TUPLE);
 207         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 208             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 209         uma_zone_set_max(V_udpcb_zone, maxsockets);
 210         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 211         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 212             EVENTHANDLER_PRI_ANY);
 213 }
 214
 215 void
 216 udplite_init(void)
 217 {
 218
 219         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 220             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init,
 221             IPI_HASHFIELDS_2TUPLE);
 222 }
 223
 224 /*
 225  * Kernel module interface for updating udpstat.  The argument is an index
 226  * into udpstat treated as an array of u_long.  While this encodes the
 227  * general layout of udpstat into the caller, it doesn't encode its location,
 228  * so that future changes to add, for example, per-CPU stats support won't
 229  * cause binary compatibility problems for kernel modules.
 230  */
 231 void
 232 kmod_udpstat_inc(int statnum)
 233 {
 234
 235         counter_u64_add(VNET(udpstat)[statnum], 1);
 236 }
 237
 238 int
 239 udp_newudpcb(struct inpcb *inp)
 240 {
 241         struct udpcb *up;
 242
 243         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 244         if (up == NULL)
 245                 return (ENOBUFS);
 246         inp->inp_ppcb = up;
 247         return (0);
 248 }
 249
 250 void
 251 udp_discardcb(struct udpcb *up)
 252 {
 253
 254         uma_zfree(V_udpcb_zone, up);
 255 }
 256
 257 #ifdef VIMAGE
 258 static void
 259 udp_destroy(void *unused __unused)
 260 {
 261
 262         in_pcbinfo_destroy(&V_udbinfo);
 263         uma_zdestroy(V_udpcb_zone);
 264 }
 265 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 266
 267 static void
 268 udplite_destroy(void *unused __unused)
 269 {
 270
 271         in_pcbinfo_destroy(&V_ulitecbinfo);
 272 }
 273 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 274     NULL);
 275 #endif
 276
 277 #ifdef INET
 278 /*
 279  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 280  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 281  * contains the source address.  If the socket ends up being an IPv6 socket,
 282  * udp_append() will convert to a sockaddr_in6 before passing the address
 283  * into the socket code.
 284  *
 285  * In the normal case udp_append() will return 0, indicating that you
 286  * must unlock the inp. However if a tunneling protocol is in place we increment
 287  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 288  * then decrement the reference count. If the inp_rele returns 1, indicating the
 289  * inp is gone, we return that to the caller to tell them *not* to unlock
 290  * the inp. In the case of multi-cast this will cause the distribution
 291  * to stop (though most tunneling protocols known currently do *not* use
 292  * multicast).
 293  */
 294 static int
 295 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 296     struct sockaddr_in *udp_in)
 297 {
 298         struct sockaddr *append_sa;
 299         struct socket *so;
 300         struct mbuf *tmpopts, *opts = NULL;
 301 #ifdef INET6
 302         struct sockaddr_in6 udp_in6;
 303 #endif
 304         struct udpcb *up;
 305
 306         INP_LOCK_ASSERT(inp);
 307
 308         /*
 309          * Engage the tunneling protocol.
 310          */
 311         up = intoudpcb(inp);
 312         if (up->u_tun_func != NULL) {
 313                 in_pcbref(inp);
 314                 INP_RUNLOCK(inp);
 315                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&udp_in[0],
 316                     up->u_tun_ctx);
 317                 INP_RLOCK(inp);
 318                 return (in_pcbrele_rlocked(inp));
 319         }
 320
 321         off += sizeof(struct udphdr);
 322
 323 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 324         /* Check AH/ESP integrity. */
 325         if (IPSEC_ENABLED(ipv4) &&
 326             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 327                 m_freem(n);
 328                 return (0);
 329         }
 330         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 331                 if (IPSEC_ENABLED(ipv4) &&
 332                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 333                         return (0);     /* Consumed. */
 334         }
 335 #endif /* IPSEC */
 336 #ifdef MAC
 337         if (mac_inpcb_check_deliver(inp, n) != 0) {
 338                 m_freem(n);
 339                 return (0);
 340         }
 341 #endif /* MAC */
 342         if (inp->inp_flags & INP_CONTROLOPTS ||
 343             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 344 #ifdef INET6
 345                 if (inp->inp_vflag & INP_IPV6)
 346                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 347                 else
 348 #endif /* INET6 */
 349                         ip_savecontrol(inp, &opts, ip, n);
 350         }
 351         if ((inp->inp_vflag & INP_IPV4) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 352                 tmpopts = sbcreatecontrol((caddr_t)&udp_in[1],
 353                         sizeof(struct sockaddr_in), IP_ORIGDSTADDR, IPPROTO_IP);
 354                 if (tmpopts) {
 355                         if (opts) {
 356                                 tmpopts->m_next = opts;
 357                                 opts = tmpopts;
 358                         } else
 359                                 opts = tmpopts;
 360                 }
 361         }
 362 #ifdef INET6
 363         if (inp->inp_vflag & INP_IPV6) {
 364                 bzero(&udp_in6, sizeof(udp_in6));
 365                 udp_in6.sin6_len = sizeof(udp_in6);
 366                 udp_in6.sin6_family = AF_INET6;
 367                 in6_sin_2_v4mapsin6(&udp_in[0], &udp_in6);
 368                 append_sa = (struct sockaddr *)&udp_in6;
 369         } else
 370 #endif /* INET6 */
 371                 append_sa = (struct sockaddr *)&udp_in[0];
 372         m_adj(n, off);
 373
 374         so = inp->inp_socket;
 375         SOCKBUF_LOCK(&so->so_rcv);
 376         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 377                 SOCKBUF_UNLOCK(&so->so_rcv);
 378                 m_freem(n);
 379                 if (opts)
 380                         m_freem(opts);
 381                 UDPSTAT_INC(udps_fullsock);
 382         } else
 383                 sorwakeup_locked(so);
 384         return (0);
 385 }
 386
 387 int
 388 udp_input(struct mbuf **mp, int *offp, int proto)
 389 {
 390         struct ip *ip;
 391         struct udphdr *uh;
 392         struct ifnet *ifp;
 393         struct inpcb *inp;
 394         uint16_t len, ip_len;
 395         struct inpcbinfo *pcbinfo;
 396         struct ip save_ip;
 397         struct sockaddr_in udp_in[2];
 398         struct mbuf *m;
 399         struct m_tag *fwd_tag;
 400         int cscov_partial, iphlen;
 401
 402         m = *mp;
 403         iphlen = *offp;
 404         ifp = m->m_pkthdr.rcvif;
 405         *mp = NULL;
 406         UDPSTAT_INC(udps_ipackets);
 407
 408         /*
 409          * Strip IP options, if any; should skip this, make available to
 410          * user, and use on returned packets, but we don't yet have a way to
 411          * check the checksum with options still present.
 412          */
 413         if (iphlen > sizeof (struct ip)) {
 414                 ip_stripoptions(m);
 415                 iphlen = sizeof(struct ip);
 416         }
 417
 418         /*
 419          * Get IP and UDP header together in first mbuf.
 420          */
 421         ip = mtod(m, struct ip *);
 422         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 423                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 424                         UDPSTAT_INC(udps_hdrops);
 425                         return (IPPROTO_DONE);
 426                 }
 427                 ip = mtod(m, struct ip *);
 428         }
 429         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 430         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 431
 432         /*
 433          * Destination port of 0 is illegal, based on RFC768.
 434          */
 435         if (uh->uh_dport == 0)
 436                 goto badunlocked;
 437
 438         /*
 439          * Construct sockaddr format source address.  Stuff source address
 440          * and datagram in user buffer.
 441          */
 442         bzero(&udp_in[0], sizeof(struct sockaddr_in) * 2);
 443         udp_in[0].sin_len = sizeof(struct sockaddr_in);
 444         udp_in[0].sin_family = AF_INET;
 445         udp_in[0].sin_port = uh->uh_sport;
 446         udp_in[0].sin_addr = ip->ip_src;
 447         udp_in[1].sin_len = sizeof(struct sockaddr_in);
 448         udp_in[1].sin_family = AF_INET;
 449         udp_in[1].sin_port = uh->uh_dport;
 450         udp_in[1].sin_addr = ip->ip_dst;
 451
 452         /*
 453          * Make mbuf data length reflect UDP length.  If not enough data to
 454          * reflect UDP length, drop.
 455          */
 456         len = ntohs((u_short)uh->uh_ulen);
 457         ip_len = ntohs(ip->ip_len) - iphlen;
 458         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 459                 /* Zero means checksum over the complete packet. */
 460                 if (len == 0)
 461                         len = ip_len;
 462                 cscov_partial = 0;
 463         }
 464         if (ip_len != len) {
 465                 if (len > ip_len || len < sizeof(struct udphdr)) {
 466                         UDPSTAT_INC(udps_badlen);
 467                         goto badunlocked;
 468                 }
 469                 if (proto == IPPROTO_UDP)
 470                         m_adj(m, len - ip_len);
 471         }
 472
 473         /*
 474          * Save a copy of the IP header in case we want restore it for
 475          * sending an ICMP error message in response.
 476          */
 477         if (!V_udp_blackhole)
 478                 save_ip = *ip;
 479         else
 480                 memset(&save_ip, 0, sizeof(save_ip));
 481
 482         /*
 483          * Checksum extended UDP header and data.
 484          */
 485         if (uh->uh_sum) {
 486                 u_short uh_sum;
 487
 488                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 489                     !cscov_partial) {
 490                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 491                                 uh_sum = m->m_pkthdr.csum_data;
 492                         else
 493                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 494                                     ip->ip_dst.s_addr, htonl((u_short)len +
 495                                     m->m_pkthdr.csum_data + proto));
 496                         uh_sum ^= 0xffff;
 497                 } else {
 498                         char b[9];
 499
 500                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 501                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 502                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 503                             uh->uh_ulen : htons(ip_len);
 504                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 505                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 506                 }
 507                 if (uh_sum) {
 508                         UDPSTAT_INC(udps_badsum);
 509                         m_freem(m);
 510                         return (IPPROTO_DONE);
 511                 }
 512         } else {
 513                 if (proto == IPPROTO_UDP) {
 514                         UDPSTAT_INC(udps_nosum);
 515                 } else {
 516                         /* UDPLite requires a checksum */
 517                         /* XXX: What is the right UDPLite MIB counter here? */
 518                         m_freem(m);
 519                         return (IPPROTO_DONE);
 520                 }
 521         }
 522
 523         pcbinfo = udp_get_inpcbinfo(proto);
 524         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 525             in_broadcast(ip->ip_dst, ifp)) {
 526                 struct inpcb *last;
 527                 struct inpcbhead *pcblist;
 528                 struct ip_moptions *imo;
 529
 530                 INP_INFO_RLOCK(pcbinfo);
 531                 pcblist = udp_get_pcblist(proto);
 532                 last = NULL;
 533                 LIST_FOREACH(inp, pcblist, inp_list) {
 534                         if (inp->inp_lport != uh->uh_dport)
 535                                 continue;
 536 #ifdef INET6
 537                         if ((inp->inp_vflag & INP_IPV4) == 0)
 538                                 continue;
 539 #endif
 540                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 541                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 542                                 continue;
 543                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 544                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 545                                 continue;
 546                         if (inp->inp_fport != 0 &&
 547                             inp->inp_fport != uh->uh_sport)
 548                                 continue;
 549
 550                         INP_RLOCK(inp);
 551
 552                         /*
 553                          * XXXRW: Because we weren't holding either the inpcb
 554                          * or the hash lock when we checked for a match
 555                          * before, we should probably recheck now that the
 556                          * inpcb lock is held.
 557                          */
 558
 559                         /*
 560                          * Handle socket delivery policy for any-source
 561                          * and source-specific multicast. [RFC3678]
 562                          */
 563                         imo = inp->inp_moptions;
 564                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 565                                 struct sockaddr_in       group;
 566                                 int                      blocked;
 567                                 if (imo == NULL) {
 568                                         INP_RUNLOCK(inp);
 569                                         continue;
 570                                 }
 571                                 bzero(&group, sizeof(struct sockaddr_in));
 572                                 group.sin_len = sizeof(struct sockaddr_in);
 573                                 group.sin_family = AF_INET;
 574                                 group.sin_addr = ip->ip_dst;
 575
 576                                 blocked = imo_multi_filter(imo, ifp,
 577                                         (struct sockaddr *)&group,
 578                                         (struct sockaddr *)&udp_in[0]);
 579                                 if (blocked != MCAST_PASS) {
 580                                         if (blocked == MCAST_NOTGMEMBER)
 581                                                 IPSTAT_INC(ips_notmember);
 582                                         if (blocked == MCAST_NOTSMEMBER ||
 583                                             blocked == MCAST_MUTED)
 584                                                 UDPSTAT_INC(udps_filtermcast);
 585                                         INP_RUNLOCK(inp);
 586                                         continue;
 587                                 }
 588                         }
 589                         if (last != NULL) {
 590                                 struct mbuf *n;
 591
 592                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 593                                     NULL) {
 594                                         UDP_PROBE(receive, NULL, last, ip,
 595                                             last, uh);
 596                                         if (udp_append(last, ip, n, iphlen,
 597                                                 udp_in)) {
 598                                                 goto inp_lost;
 599                                         }
 600                                 }
 601                                 INP_RUNLOCK(last);
 602                         }
 603                         last = inp;
 604                         /*
 605                          * Don't look for additional matches if this one does
 606                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 607                          * socket options set.  This heuristic avoids
 608                          * searching through all pcbs in the common case of a
 609                          * non-shared port.  It assumes that an application
 610                          * will never clear these options after setting them.
 611                          */
 612                         if ((last->inp_socket->so_options &
 613                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 614                                 break;
 615                 }
 616
 617                 if (last == NULL) {
 618                         /*
 619                          * No matching pcb found; discard datagram.  (No need
 620                          * to send an ICMP Port Unreachable for a broadcast
 621                          * or multicast datgram.)
 622                          */
 623                         UDPSTAT_INC(udps_noportbcast);
 624                         if (inp)
 625                                 INP_RUNLOCK(inp);
 626                         INP_INFO_RUNLOCK(pcbinfo);
 627                         goto badunlocked;
 628                 }
 629                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 630                 if (udp_append(last, ip, m, iphlen, udp_in) == 0)
 631                         INP_RUNLOCK(last);
 632         inp_lost:
 633                 INP_INFO_RUNLOCK(pcbinfo);
 634                 return (IPPROTO_DONE);
 635         }
 636
 637         /*
 638          * Locate pcb for datagram.
 639          */
 640
 641         /*
 642          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 643          */
 644         if ((m->m_flags & M_IP_NEXTHOP) &&
 645             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 646                 struct sockaddr_in *next_hop;
 647
 648                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 649
 650                 /*
 651                  * Transparently forwarded. Pretend to be the destination.
 652                  * Already got one like this?
 653                  */
 654                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 655                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 656                 if (!inp) {
 657                         /*
 658                          * It's new.  Try to find the ambushing socket.
 659                          * Because we've rewritten the destination address,
 660                          * any hardware-generated hash is ignored.
 661                          */
 662                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 663                             uh->uh_sport, next_hop->sin_addr,
 664                             next_hop->sin_port ? htons(next_hop->sin_port) :
 665                             uh->uh_dport, INPLOOKUP_WILDCARD |
 666                             INPLOOKUP_RLOCKPCB, ifp);
 667                 }
 668                 /* Remove the tag from the packet. We don't need it anymore. */
 669                 m_tag_delete(m, fwd_tag);
 670                 m->m_flags &= ~M_IP_NEXTHOP;
 671         } else
 672                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 673                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 674                     INPLOOKUP_RLOCKPCB, ifp, m);
 675         if (inp == NULL) {
 676                 if (udp_log_in_vain) {
 677                         char src[INET_ADDRSTRLEN];
 678                         char dst[INET_ADDRSTRLEN];
 679
 680                         log(LOG_INFO,
 681                             "Connection attempt to UDP %s:%d from %s:%d\n",
 682                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 683                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 684                 }
 685                 UDPSTAT_INC(udps_noport);
 686                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 687                         UDPSTAT_INC(udps_noportbcast);
 688                         goto badunlocked;
 689                 }
 690                 if (V_udp_blackhole)
 691                         goto badunlocked;
 692                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 693                         goto badunlocked;
 694                 *ip = save_ip;
 695                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 696                 return (IPPROTO_DONE);
 697         }
 698
 699         /*
 700          * Check the minimum TTL for socket.
 701          */
 702         INP_RLOCK_ASSERT(inp);
 703         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 704                 INP_RUNLOCK(inp);
 705                 m_freem(m);
 706                 return (IPPROTO_DONE);
 707         }
 708         if (cscov_partial) {
 709                 struct udpcb *up;
 710
 711                 up = intoudpcb(inp);
 712                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 713                         INP_RUNLOCK(inp);
 714                         m_freem(m);
 715                         return (IPPROTO_DONE);
 716                 }
 717         }
 718
 719         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 720         if (udp_append(inp, ip, m, iphlen, udp_in) == 0)
 721                 INP_RUNLOCK(inp);
 722         return (IPPROTO_DONE);
 723
 724 badunlocked:
 725         m_freem(m);
 726         return (IPPROTO_DONE);
 727 }
 728 #endif /* INET */
 729
 730 /*
 731  * Notify a udp user of an asynchronous error; just wake up so that they can
 732  * collect error status.
 733  */
 734 struct inpcb *
 735 udp_notify(struct inpcb *inp, int errno)
 736 {
 737
 738         /*
 739          * While udp_ctlinput() always calls udp_notify() with a read lock
 740          * when invoking it directly, in_pcbnotifyall() currently uses write
 741          * locks due to sharing code with TCP.  For now, accept either a read
 742          * or a write lock, but a read lock is sufficient.
 743          */
 744         INP_LOCK_ASSERT(inp);
 745         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 746              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 747                 RTFREE(inp->inp_route.ro_rt);
 748                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 749         }
 750
 751         inp->inp_socket->so_error = errno;
 752         sorwakeup(inp->inp_socket);
 753         sowwakeup(inp->inp_socket);
 754         return (inp);
 755 }
 756
 757 #ifdef INET
 758 static void
 759 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 760     struct inpcbinfo *pcbinfo)
 761 {
 762         struct ip *ip = vip;
 763         struct udphdr *uh;
 764         struct in_addr faddr;
 765         struct inpcb *inp;
 766
 767         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 768         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 769                 return;
 770
 771         if (PRC_IS_REDIRECT(cmd)) {
 772                 /* signal EHOSTDOWN, as it flushes the cached route */
 773                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 774                 return;
 775         }
 776
 777         /*
 778          * Hostdead is ugly because it goes linearly through all PCBs.
 779          *
 780          * XXX: We never get this from ICMP, otherwise it makes an excellent
 781          * DoS attack on machines with many connections.
 782          */
 783         if (cmd == PRC_HOSTDEAD)
 784                 ip = NULL;
 785         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 786                 return;
 787         if (ip != NULL) {
 788                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 789                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 790                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 791                 if (inp != NULL) {
 792                         INP_RLOCK_ASSERT(inp);
 793                         if (inp->inp_socket != NULL) {
 794                                 udp_notify(inp, inetctlerrmap[cmd]);
 795                         }
 796                         INP_RUNLOCK(inp);
 797                 } else {
 798                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 799                                            ip->ip_src, uh->uh_sport,
 800                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 801                         if (inp != NULL) {
 802                                 struct udpcb *up;
 803
 804                                 up = intoudpcb(inp);
 805                                 if (up->u_icmp_func != NULL) {
 806                                         INP_RUNLOCK(inp);
 807                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
 808                                 } else {
 809                                         INP_RUNLOCK(inp);
 810                                 }
 811                         }
 812                 }
 813         } else
 814                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 815                     udp_notify);
 816 }
 817 void
 818 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 819 {
 820
 821         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 822 }
 823
 824 void
 825 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 826 {
 827
 828         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 829 }
 830 #endif /* INET */
 831
 832 static int
 833 udp_pcblist(SYSCTL_HANDLER_ARGS)
 834 {
 835         int error, i, n;
 836         struct inpcb *inp, **inp_list;
 837         inp_gen_t gencnt;
 838         struct xinpgen xig;
 839
 840         /*
 841          * The process of preparing the PCB list is too time-consuming and
 842          * resource-intensive to repeat twice on every request.
 843          */
 844         if (req->oldptr == 0) {
 845                 n = V_udbinfo.ipi_count;
 846                 n += imax(n / 8, 10);
 847                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 848                 return (0);
 849         }
 850
 851         if (req->newptr != 0)
 852                 return (EPERM);
 853
 854         /*
 855          * OK, now we're committed to doing something.
 856          */
 857         INP_INFO_RLOCK(&V_udbinfo);
 858         gencnt = V_udbinfo.ipi_gencnt;
 859         n = V_udbinfo.ipi_count;
 860         INP_INFO_RUNLOCK(&V_udbinfo);
 861
 862         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 863                 + n * sizeof(struct xinpcb));
 864         if (error != 0)
 865                 return (error);
 866
 867         xig.xig_len = sizeof xig;
 868         xig.xig_count = n;
 869         xig.xig_gen = gencnt;
 870         xig.xig_sogen = so_gencnt;
 871         error = SYSCTL_OUT(req, &xig, sizeof xig);
 872         if (error)
 873                 return (error);
 874
 875         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 876         if (inp_list == NULL)
 877                 return (ENOMEM);
 878
 879         INP_INFO_RLOCK(&V_udbinfo);
 880         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 881              inp = LIST_NEXT(inp, inp_list)) {
 882                 INP_WLOCK(inp);
 883                 if (inp->inp_gencnt <= gencnt &&
 884                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 885                         in_pcbref(inp);
 886                         inp_list[i++] = inp;
 887                 }
 888                 INP_WUNLOCK(inp);
 889         }
 890         INP_INFO_RUNLOCK(&V_udbinfo);
 891         n = i;
 892
 893         error = 0;
 894         for (i = 0; i < n; i++) {
 895                 inp = inp_list[i];
 896                 INP_RLOCK(inp);
 897                 if (inp->inp_gencnt <= gencnt) {
 898                         struct xinpcb xi;
 899
 900                         in_pcbtoxinpcb(inp, &xi);
 901                         INP_RUNLOCK(inp);
 902                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 903                 } else
 904                         INP_RUNLOCK(inp);
 905         }
 906         INP_INFO_WLOCK(&V_udbinfo);
 907         for (i = 0; i < n; i++) {
 908                 inp = inp_list[i];
 909                 INP_RLOCK(inp);
 910                 if (!in_pcbrele_rlocked(inp))
 911                         INP_RUNLOCK(inp);
 912         }
 913         INP_INFO_WUNLOCK(&V_udbinfo);
 914
 915         if (!error) {
 916                 /*
 917                  * Give the user an updated idea of our state.  If the
 918                  * generation differs from what we told her before, she knows
 919                  * that something happened while we were processing this
 920                  * request, and it might be necessary to retry.
 921                  */
 922                 INP_INFO_RLOCK(&V_udbinfo);
 923                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 924                 xig.xig_sogen = so_gencnt;
 925                 xig.xig_count = V_udbinfo.ipi_count;
 926                 INP_INFO_RUNLOCK(&V_udbinfo);
 927                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 928         }
 929         free(inp_list, M_TEMP);
 930         return (error);
 931 }
 932
 933 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 934     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 935     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 936
 937 #ifdef INET
 938 static int
 939 udp_getcred(SYSCTL_HANDLER_ARGS)
 940 {
 941         struct xucred xuc;
 942         struct sockaddr_in addrs[2];
 943         struct inpcb *inp;
 944         int error;
 945
 946         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 947         if (error)
 948                 return (error);
 949         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 950         if (error)
 951                 return (error);
 952         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 953             addrs[0].sin_addr, addrs[0].sin_port,
 954             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 955         if (inp != NULL) {
 956                 INP_RLOCK_ASSERT(inp);
 957                 if (inp->inp_socket == NULL)
 958                         error = ENOENT;
 959                 if (error == 0)
 960                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 961                 if (error == 0)
 962                         cru2x(inp->inp_cred, &xuc);
 963                 INP_RUNLOCK(inp);
 964         } else
 965                 error = ENOENT;
 966         if (error == 0)
 967                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 968         return (error);
 969 }
 970
 971 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 972     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 973     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 974 #endif /* INET */
 975
 976 int
 977 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 978 {
 979         struct inpcb *inp;
 980         struct udpcb *up;
 981         int isudplite, error, optval;
 982
 983         error = 0;
 984         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 985         inp = sotoinpcb(so);
 986         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 987         INP_WLOCK(inp);
 988         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 989 #ifdef INET6
 990                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 991                         INP_WUNLOCK(inp);
 992                         error = ip6_ctloutput(so, sopt);
 993                 }
 994 #endif
 995 #if defined(INET) && defined(INET6)
 996                 else
 997 #endif
 998 #ifdef INET
 999                 {
1000                         INP_WUNLOCK(inp);
1001                         error = ip_ctloutput(so, sopt);
1002                 }
1003 #endif
1004                 return (error);
1005         }
1006
1007         switch (sopt->sopt_dir) {
1008         case SOPT_SET:
1009                 switch (sopt->sopt_name) {
1010 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1011 #ifdef INET
1012                 case UDP_ENCAP:
1013                         if (!IPSEC_ENABLED(ipv4)) {
1014                                 INP_WUNLOCK(inp);
1015                                 return (ENOPROTOOPT);
1016                         }
1017                         error = UDPENCAP_PCBCTL(inp, sopt);
1018                         break;
1019 #endif /* INET */
1020 #endif /* IPSEC */
1021                 case UDPLITE_SEND_CSCOV:
1022                 case UDPLITE_RECV_CSCOV:
1023                         if (!isudplite) {
1024                                 INP_WUNLOCK(inp);
1025                                 error = ENOPROTOOPT;
1026                                 break;
1027                         }
1028                         INP_WUNLOCK(inp);
1029                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1030                             sizeof(optval));
1031                         if (error != 0)
1032                                 break;
1033                         inp = sotoinpcb(so);
1034                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1035                         INP_WLOCK(inp);
1036                         up = intoudpcb(inp);
1037                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1038                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1039                                 INP_WUNLOCK(inp);
1040                                 error = EINVAL;
1041                                 break;
1042                         }
1043                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1044                                 up->u_txcslen = optval;
1045                         else
1046                                 up->u_rxcslen = optval;
1047                         INP_WUNLOCK(inp);
1048                         break;
1049                 default:
1050                         INP_WUNLOCK(inp);
1051                         error = ENOPROTOOPT;
1052                         break;
1053                 }
1054                 break;
1055         case SOPT_GET:
1056                 switch (sopt->sopt_name) {
1057 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1058 #ifdef INET
1059                 case UDP_ENCAP:
1060                         if (!IPSEC_ENABLED(ipv4)) {
1061                                 INP_WUNLOCK(inp);
1062                                 return (ENOPROTOOPT);
1063                         }
1064                         error = UDPENCAP_PCBCTL(inp, sopt);
1065                         break;
1066 #endif /* INET */
1067 #endif /* IPSEC */
1068                 case UDPLITE_SEND_CSCOV:
1069                 case UDPLITE_RECV_CSCOV:
1070                         if (!isudplite) {
1071                                 INP_WUNLOCK(inp);
1072                                 error = ENOPROTOOPT;
1073                                 break;
1074                         }
1075                         up = intoudpcb(inp);
1076                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1077                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1078                                 optval = up->u_txcslen;
1079                         else
1080                                 optval = up->u_rxcslen;
1081                         INP_WUNLOCK(inp);
1082                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1083                         break;
1084                 default:
1085                         INP_WUNLOCK(inp);
1086                         error = ENOPROTOOPT;
1087                         break;
1088                 }
1089                 break;
1090         }
1091         return (error);
1092 }
1093
1094 #ifdef INET
1095 #define UH_WLOCKED      2
1096 #define UH_RLOCKED      1
1097 #define UH_UNLOCKED     0
1098 static int
1099 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1100     struct mbuf *control, struct thread *td)
1101 {
1102         struct udpiphdr *ui;
1103         int len = m->m_pkthdr.len;
1104         struct in_addr faddr, laddr;
1105         struct cmsghdr *cm;
1106         struct inpcbinfo *pcbinfo;
1107         struct sockaddr_in *sin, src;
1108         int cscov_partial = 0;
1109         int error = 0;
1110         int ipflags;
1111         u_short fport, lport;
1112         int unlock_udbinfo, unlock_inp;
1113         u_char tos;
1114         uint8_t pr;
1115         uint16_t cscov = 0;
1116         uint32_t flowid = 0;
1117         uint8_t flowtype = M_HASHTYPE_NONE;
1118
1119         /*
1120          * udp_output() may need to temporarily bind or connect the current
1121          * inpcb.  As such, we don't know up front whether we will need the
1122          * pcbinfo lock or not.  Do any work to decide what is needed up
1123          * front before acquiring any locks.
1124          */
1125         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1126                 if (control)
1127                         m_freem(control);
1128                 m_freem(m);
1129                 return (EMSGSIZE);
1130         }
1131
1132         src.sin_family = 0;
1133         sin = (struct sockaddr_in *)addr;
1134         if (sin == NULL ||
1135             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1136                 INP_WLOCK(inp);
1137                 unlock_inp = UH_WLOCKED;
1138         } else {
1139                 INP_RLOCK(inp);
1140                 unlock_inp = UH_RLOCKED;
1141         }
1142         tos = inp->inp_ip_tos;
1143         if (control != NULL) {
1144                 /*
1145                  * XXX: Currently, we assume all the optional information is
1146                  * stored in a single mbuf.
1147                  */
1148                 if (control->m_next) {
1149                         if (unlock_inp == UH_WLOCKED)
1150                                 INP_WUNLOCK(inp);
1151                         else
1152                                 INP_RUNLOCK(inp);
1153                         m_freem(control);
1154                         m_freem(m);
1155                         return (EINVAL);
1156                 }
1157                 for (; control->m_len > 0;
1158                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1159                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1160                         cm = mtod(control, struct cmsghdr *);
1161                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1162                             || cm->cmsg_len > control->m_len) {
1163                                 error = EINVAL;
1164                                 break;
1165                         }
1166                         if (cm->cmsg_level != IPPROTO_IP)
1167                                 continue;
1168
1169                         switch (cm->cmsg_type) {
1170                         case IP_SENDSRCADDR:
1171                                 if (cm->cmsg_len !=
1172                                     CMSG_LEN(sizeof(struct in_addr))) {
1173                                         error = EINVAL;
1174                                         break;
1175                                 }
1176                                 bzero(&src, sizeof(src));
1177                                 src.sin_family = AF_INET;
1178                                 src.sin_len = sizeof(src);
1179                                 src.sin_port = inp->inp_lport;
1180                                 src.sin_addr =
1181                                     *(struct in_addr *)CMSG_DATA(cm);
1182                                 break;
1183
1184                         case IP_TOS:
1185                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1186                                         error = EINVAL;
1187                                         break;
1188                                 }
1189                                 tos = *(u_char *)CMSG_DATA(cm);
1190                                 break;
1191
1192                         case IP_FLOWID:
1193                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1194                                         error = EINVAL;
1195                                         break;
1196                                 }
1197                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1198                                 break;
1199
1200                         case IP_FLOWTYPE:
1201                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1202                                         error = EINVAL;
1203                                         break;
1204                                 }
1205                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1206                                 break;
1207
1208 #ifdef  RSS
1209                         case IP_RSSBUCKETID:
1210                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1211                                         error = EINVAL;
1212                                         break;
1213                                 }
1214                                 /* This is just a placeholder for now */
1215                                 break;
1216 #endif  /* RSS */
1217                         default:
1218                                 error = ENOPROTOOPT;
1219                                 break;
1220                         }
1221                         if (error)
1222                                 break;
1223                 }
1224                 m_freem(control);
1225         }
1226         if (error) {
1227                 if (unlock_inp == UH_WLOCKED)
1228                         INP_WUNLOCK(inp);
1229                 else
1230                         INP_RUNLOCK(inp);
1231                 m_freem(m);
1232                 return (error);
1233         }
1234
1235         /*
1236          * Depending on whether or not the application has bound or connected
1237          * the socket, we may have to do varying levels of work.  The optimal
1238          * case is for a connected UDP socket, as a global lock isn't
1239          * required at all.
1240          *
1241          * In order to decide which we need, we require stability of the
1242          * inpcb binding, which we ensure by acquiring a read lock on the
1243          * inpcb.  This doesn't strictly follow the lock order, so we play
1244          * the trylock and retry game; note that we may end up with more
1245          * conservative locks than required the second time around, so later
1246          * assertions have to accept that.  Further analysis of the number of
1247          * misses under contention is required.
1248          *
1249          * XXXRW: Check that hash locking update here is correct.
1250          */
1251         pr = inp->inp_socket->so_proto->pr_protocol;
1252         pcbinfo = udp_get_inpcbinfo(pr);
1253         sin = (struct sockaddr_in *)addr;
1254         if (sin != NULL &&
1255             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1256                 INP_HASH_WLOCK(pcbinfo);
1257                 unlock_udbinfo = UH_WLOCKED;
1258         } else if ((sin != NULL && (
1259             (sin->sin_addr.s_addr == INADDR_ANY) ||
1260             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1261             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1262             (inp->inp_lport == 0))) ||
1263             (src.sin_family == AF_INET)) {
1264                 INP_HASH_RLOCK(pcbinfo);
1265                 unlock_udbinfo = UH_RLOCKED;
1266         } else
1267                 unlock_udbinfo = UH_UNLOCKED;
1268
1269         /*
1270          * If the IP_SENDSRCADDR control message was specified, override the
1271          * source address for this datagram.  Its use is invalidated if the
1272          * address thus specified is incomplete or clobbers other inpcbs.
1273          */
1274         laddr = inp->inp_laddr;
1275         lport = inp->inp_lport;
1276         if (src.sin_family == AF_INET) {
1277                 INP_HASH_LOCK_ASSERT(pcbinfo);
1278                 if ((lport == 0) ||
1279                     (laddr.s_addr == INADDR_ANY &&
1280                      src.sin_addr.s_addr == INADDR_ANY)) {
1281                         error = EINVAL;
1282                         goto release;
1283                 }
1284                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1285                     &laddr.s_addr, &lport, td->td_ucred);
1286                 if (error)
1287                         goto release;
1288         }
1289
1290         /*
1291          * If a UDP socket has been connected, then a local address/port will
1292          * have been selected and bound.
1293          *
1294          * If a UDP socket has not been connected to, then an explicit
1295          * destination address must be used, in which case a local
1296          * address/port may not have been selected and bound.
1297          */
1298         if (sin != NULL) {
1299                 INP_LOCK_ASSERT(inp);
1300                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1301                         error = EISCONN;
1302                         goto release;
1303                 }
1304
1305                 /*
1306                  * Jail may rewrite the destination address, so let it do
1307                  * that before we use it.
1308                  */
1309                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1310                 if (error)
1311                         goto release;
1312
1313                 /*
1314                  * If a local address or port hasn't yet been selected, or if
1315                  * the destination address needs to be rewritten due to using
1316                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1317                  * to do the heavy lifting.  Once a port is selected, we
1318                  * commit the binding back to the socket; we also commit the
1319                  * binding of the address if in jail.
1320                  *
1321                  * If we already have a valid binding and we're not
1322                  * requesting a destination address rewrite, use a fast path.
1323                  */
1324                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1325                     inp->inp_lport == 0 ||
1326                     sin->sin_addr.s_addr == INADDR_ANY ||
1327                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1328                         INP_HASH_LOCK_ASSERT(pcbinfo);
1329                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1330                             &lport, &faddr.s_addr, &fport, NULL,
1331                             td->td_ucred);
1332                         if (error)
1333                                 goto release;
1334
1335                         /*
1336                          * XXXRW: Why not commit the port if the address is
1337                          * !INADDR_ANY?
1338                          */
1339                         /* Commit the local port if newly assigned. */
1340                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1341                             inp->inp_lport == 0) {
1342                                 INP_WLOCK_ASSERT(inp);
1343                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1344                                 /*
1345                                  * Remember addr if jailed, to prevent
1346                                  * rebinding.
1347                                  */
1348                                 if (prison_flag(td->td_ucred, PR_IP4))
1349                                         inp->inp_laddr = laddr;
1350                                 inp->inp_lport = lport;
1351                                 if (in_pcbinshash(inp) != 0) {
1352                                         inp->inp_lport = 0;
1353                                         error = EAGAIN;
1354                                         goto release;
1355                                 }
1356                                 inp->inp_flags |= INP_ANONPORT;
1357                         }
1358                 } else {
1359                         faddr = sin->sin_addr;
1360                         fport = sin->sin_port;
1361                 }
1362         } else {
1363                 INP_LOCK_ASSERT(inp);
1364                 faddr = inp->inp_faddr;
1365                 fport = inp->inp_fport;
1366                 if (faddr.s_addr == INADDR_ANY) {
1367                         error = ENOTCONN;
1368                         goto release;
1369                 }
1370         }
1371
1372         /*
1373          * Calculate data length and get a mbuf for UDP, IP, and possible
1374          * link-layer headers.  Immediate slide the data pointer back forward
1375          * since we won't use that space at this layer.
1376          */
1377         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1378         if (m == NULL) {
1379                 error = ENOBUFS;
1380                 goto release;
1381         }
1382         m->m_data += max_linkhdr;
1383         m->m_len -= max_linkhdr;
1384         m->m_pkthdr.len -= max_linkhdr;
1385
1386         /*
1387          * Fill in mbuf with extended UDP header and addresses and length put
1388          * into network format.
1389          */
1390         ui = mtod(m, struct udpiphdr *);
1391         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1392         ui->ui_pr = pr;
1393         ui->ui_src = laddr;
1394         ui->ui_dst = faddr;
1395         ui->ui_sport = lport;
1396         ui->ui_dport = fport;
1397         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1398         if (pr == IPPROTO_UDPLITE) {
1399                 struct udpcb *up;
1400                 uint16_t plen;
1401
1402                 up = intoudpcb(inp);
1403                 cscov = up->u_txcslen;
1404                 plen = (u_short)len + sizeof(struct udphdr);
1405                 if (cscov >= plen)
1406                         cscov = 0;
1407                 ui->ui_len = htons(plen);
1408                 ui->ui_ulen = htons(cscov);
1409                 /*
1410                  * For UDP-Lite, checksum coverage length of zero means
1411                  * the entire UDPLite packet is covered by the checksum.
1412                  */
1413                 cscov_partial = (cscov == 0) ? 0 : 1;
1414         } else
1415                 ui->ui_v = IPVERSION << 4;
1416
1417         /*
1418          * Set the Don't Fragment bit in the IP header.
1419          */
1420         if (inp->inp_flags & INP_DONTFRAG) {
1421                 struct ip *ip;
1422
1423                 ip = (struct ip *)&ui->ui_i;
1424                 ip->ip_off |= htons(IP_DF);
1425         }
1426
1427         ipflags = 0;
1428         if (inp->inp_socket->so_options & SO_DONTROUTE)
1429                 ipflags |= IP_ROUTETOIF;
1430         if (inp->inp_socket->so_options & SO_BROADCAST)
1431                 ipflags |= IP_ALLOWBROADCAST;
1432         if (inp->inp_flags & INP_ONESBCAST)
1433                 ipflags |= IP_SENDONES;
1434
1435 #ifdef MAC
1436         mac_inpcb_create_mbuf(inp, m);
1437 #endif
1438
1439         /*
1440          * Set up checksum and output datagram.
1441          */
1442         ui->ui_sum = 0;
1443         if (pr == IPPROTO_UDPLITE) {
1444                 if (inp->inp_flags & INP_ONESBCAST)
1445                         faddr.s_addr = INADDR_BROADCAST;
1446                 if (cscov_partial) {
1447                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1448                                 ui->ui_sum = 0xffff;
1449                 } else {
1450                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1451                                 ui->ui_sum = 0xffff;
1452                 }
1453         } else if (V_udp_cksum) {
1454                 if (inp->inp_flags & INP_ONESBCAST)
1455                         faddr.s_addr = INADDR_BROADCAST;
1456                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1457                     htons((u_short)len + sizeof(struct udphdr) + pr));
1458                 m->m_pkthdr.csum_flags = CSUM_UDP;
1459                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1460         }
1461         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1462         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1463         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1464         UDPSTAT_INC(udps_opackets);
1465
1466         /*
1467          * Setup flowid / RSS information for outbound socket.
1468          *
1469          * Once the UDP code decides to set a flowid some other way,
1470          * this allows the flowid to be overridden by userland.
1471          */
1472         if (flowtype != M_HASHTYPE_NONE) {
1473                 m->m_pkthdr.flowid = flowid;
1474                 M_HASHTYPE_SET(m, flowtype);
1475 #ifdef  RSS
1476         } else {
1477                 uint32_t hash_val, hash_type;
1478                 /*
1479                  * Calculate an appropriate RSS hash for UDP and
1480                  * UDP Lite.
1481                  *
1482                  * The called function will take care of figuring out
1483                  * whether a 2-tuple or 4-tuple hash is required based
1484                  * on the currently configured scheme.
1485                  *
1486                  * Later later on connected socket values should be
1487                  * cached in the inpcb and reused, rather than constantly
1488                  * re-calculating it.
1489                  *
1490                  * UDP Lite is a different protocol number and will
1491                  * likely end up being hashed as a 2-tuple until
1492                  * RSS / NICs grow UDP Lite protocol awareness.
1493                  */
1494                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1495                     pr, &hash_val, &hash_type) == 0) {
1496                         m->m_pkthdr.flowid = hash_val;
1497                         M_HASHTYPE_SET(m, hash_type);
1498                 }
1499 #endif
1500         }
1501
1502 #ifdef  RSS
1503         /*
1504          * Don't override with the inp cached flowid value.
1505          *
1506          * Depending upon the kind of send being done, the inp
1507          * flowid/flowtype values may actually not be appropriate
1508          * for this particular socket send.
1509          *
1510          * We should either leave the flowid at zero (which is what is
1511          * currently done) or set it to some software generated
1512          * hash value based on the packet contents.
1513          */
1514         ipflags |= IP_NODEFAULTFLOWID;
1515 #endif  /* RSS */
1516
1517         if (unlock_udbinfo == UH_WLOCKED)
1518                 INP_HASH_WUNLOCK(pcbinfo);
1519         else if (unlock_udbinfo == UH_RLOCKED)
1520                 INP_HASH_RUNLOCK(pcbinfo);
1521         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1522         error = ip_output(m, inp->inp_options,
1523             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1524             inp->inp_moptions, inp);
1525         if (unlock_inp == UH_WLOCKED)
1526                 INP_WUNLOCK(inp);
1527         else
1528                 INP_RUNLOCK(inp);
1529         return (error);
1530
1531 release:
1532         if (unlock_udbinfo == UH_WLOCKED) {
1533                 KASSERT(unlock_inp == UH_WLOCKED,
1534                     ("%s: excl udbinfo lock, shared inp lock", __func__));
1535                 INP_HASH_WUNLOCK(pcbinfo);
1536                 INP_WUNLOCK(inp);
1537         } else if (unlock_udbinfo == UH_RLOCKED) {
1538                 KASSERT(unlock_inp == UH_RLOCKED,
1539                     ("%s: shared udbinfo lock, excl inp lock", __func__));
1540                 INP_HASH_RUNLOCK(pcbinfo);
1541                 INP_RUNLOCK(inp);
1542         } else if (unlock_inp == UH_WLOCKED)
1543                 INP_WUNLOCK(inp);
1544         else
1545                 INP_RUNLOCK(inp);
1546         m_freem(m);
1547         return (error);
1548 }
1549
1550 static void
1551 udp_abort(struct socket *so)
1552 {
1553         struct inpcb *inp;
1554         struct inpcbinfo *pcbinfo;
1555
1556         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1557         inp = sotoinpcb(so);
1558         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1559         INP_WLOCK(inp);
1560         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1561                 INP_HASH_WLOCK(pcbinfo);
1562                 in_pcbdisconnect(inp);
1563                 inp->inp_laddr.s_addr = INADDR_ANY;
1564                 INP_HASH_WUNLOCK(pcbinfo);
1565                 soisdisconnected(so);
1566         }
1567         INP_WUNLOCK(inp);
1568 }
1569
1570 static int
1571 udp_attach(struct socket *so, int proto, struct thread *td)
1572 {
1573         struct inpcb *inp;
1574         struct inpcbinfo *pcbinfo;
1575         int error;
1576
1577         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1578         inp = sotoinpcb(so);
1579         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1580         error = soreserve(so, udp_sendspace, udp_recvspace);
1581         if (error)
1582                 return (error);
1583         INP_INFO_WLOCK(pcbinfo);
1584         error = in_pcballoc(so, pcbinfo);
1585         if (error) {
1586                 INP_INFO_WUNLOCK(pcbinfo);
1587                 return (error);
1588         }
1589
1590         inp = sotoinpcb(so);
1591         inp->inp_vflag |= INP_IPV4;
1592         inp->inp_ip_ttl = V_ip_defttl;
1593
1594         error = udp_newudpcb(inp);
1595         if (error) {
1596                 in_pcbdetach(inp);
1597                 in_pcbfree(inp);
1598                 INP_INFO_WUNLOCK(pcbinfo);
1599                 return (error);
1600         }
1601
1602         INP_WUNLOCK(inp);
1603         INP_INFO_WUNLOCK(pcbinfo);
1604         return (0);
1605 }
1606 #endif /* INET */
1607
1608 int
1609 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1610 {
1611         struct inpcb *inp;
1612         struct udpcb *up;
1613
1614         KASSERT(so->so_type == SOCK_DGRAM,
1615             ("udp_set_kernel_tunneling: !dgram"));
1616         inp = sotoinpcb(so);
1617         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1618         INP_WLOCK(inp);
1619         up = intoudpcb(inp);
1620         if ((up->u_tun_func != NULL) ||
1621             (up->u_icmp_func != NULL)) {
1622                 INP_WUNLOCK(inp);
1623                 return (EBUSY);
1624         }
1625         up->u_tun_func = f;
1626         up->u_icmp_func = i;
1627         up->u_tun_ctx = ctx;
1628         INP_WUNLOCK(inp);
1629         return (0);
1630 }
1631
1632 #ifdef INET
1633 static int
1634 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1635 {
1636         struct inpcb *inp;
1637         struct inpcbinfo *pcbinfo;
1638         int error;
1639
1640         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1641         inp = sotoinpcb(so);
1642         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1643         INP_WLOCK(inp);
1644         INP_HASH_WLOCK(pcbinfo);
1645         error = in_pcbbind(inp, nam, td->td_ucred);
1646         INP_HASH_WUNLOCK(pcbinfo);
1647         INP_WUNLOCK(inp);
1648         return (error);
1649 }
1650
1651 static void
1652 udp_close(struct socket *so)
1653 {
1654         struct inpcb *inp;
1655         struct inpcbinfo *pcbinfo;
1656
1657         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1658         inp = sotoinpcb(so);
1659         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1660         INP_WLOCK(inp);
1661         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1662                 INP_HASH_WLOCK(pcbinfo);
1663                 in_pcbdisconnect(inp);
1664                 inp->inp_laddr.s_addr = INADDR_ANY;
1665                 INP_HASH_WUNLOCK(pcbinfo);
1666                 soisdisconnected(so);
1667         }
1668         INP_WUNLOCK(inp);
1669 }
1670
1671 static int
1672 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1673 {
1674         struct inpcb *inp;
1675         struct inpcbinfo *pcbinfo;
1676         struct sockaddr_in *sin;
1677         int error;
1678
1679         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1680         inp = sotoinpcb(so);
1681         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1682         INP_WLOCK(inp);
1683         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1684                 INP_WUNLOCK(inp);
1685                 return (EISCONN);
1686         }
1687         sin = (struct sockaddr_in *)nam;
1688         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1689         if (error != 0) {
1690                 INP_WUNLOCK(inp);
1691                 return (error);
1692         }
1693         INP_HASH_WLOCK(pcbinfo);
1694         error = in_pcbconnect(inp, nam, td->td_ucred);
1695         INP_HASH_WUNLOCK(pcbinfo);
1696         if (error == 0)
1697                 soisconnected(so);
1698         INP_WUNLOCK(inp);
1699         return (error);
1700 }
1701
1702 static void
1703 udp_detach(struct socket *so)
1704 {
1705         struct inpcb *inp;
1706         struct inpcbinfo *pcbinfo;
1707         struct udpcb *up;
1708
1709         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1710         inp = sotoinpcb(so);
1711         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1712         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1713             ("udp_detach: not disconnected"));
1714         INP_INFO_WLOCK(pcbinfo);
1715         INP_WLOCK(inp);
1716         up = intoudpcb(inp);
1717         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1718         inp->inp_ppcb = NULL;
1719         in_pcbdetach(inp);
1720         in_pcbfree(inp);
1721         INP_INFO_WUNLOCK(pcbinfo);
1722         udp_discardcb(up);
1723 }
1724
1725 static int
1726 udp_disconnect(struct socket *so)
1727 {
1728         struct inpcb *inp;
1729         struct inpcbinfo *pcbinfo;
1730
1731         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1732         inp = sotoinpcb(so);
1733         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1734         INP_WLOCK(inp);
1735         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1736                 INP_WUNLOCK(inp);
1737                 return (ENOTCONN);
1738         }
1739         INP_HASH_WLOCK(pcbinfo);
1740         in_pcbdisconnect(inp);
1741         inp->inp_laddr.s_addr = INADDR_ANY;
1742         INP_HASH_WUNLOCK(pcbinfo);
1743         SOCK_LOCK(so);
1744         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1745         SOCK_UNLOCK(so);
1746         INP_WUNLOCK(inp);
1747         return (0);
1748 }
1749
1750 static int
1751 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1752     struct mbuf *control, struct thread *td)
1753 {
1754         struct inpcb *inp;
1755
1756         inp = sotoinpcb(so);
1757         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1758         return (udp_output(inp, m, addr, control, td));
1759 }
1760 #endif /* INET */
1761
1762 int
1763 udp_shutdown(struct socket *so)
1764 {
1765         struct inpcb *inp;
1766
1767         inp = sotoinpcb(so);
1768         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1769         INP_WLOCK(inp);
1770         socantsendmore(so);
1771         INP_WUNLOCK(inp);
1772         return (0);
1773 }
1774
1775 #ifdef INET
1776 struct pr_usrreqs udp_usrreqs = {
1777         .pru_abort =            udp_abort,
1778         .pru_attach =           udp_attach,
1779         .pru_bind =             udp_bind,
1780         .pru_connect =          udp_connect,
1781         .pru_control =          in_control,
1782         .pru_detach =           udp_detach,
1783         .pru_disconnect =       udp_disconnect,
1784         .pru_peeraddr =         in_getpeeraddr,
1785         .pru_send =             udp_send,
1786         .pru_soreceive =        soreceive_dgram,
1787         .pru_sosend =           sosend_dgram,
1788         .pru_shutdown =         udp_shutdown,
1789         .pru_sockaddr =         in_getsockaddr,
1790         .pru_sosetlabel =       in_pcbsosetlabel,
1791         .pru_close =            udp_close,
1792 };
1793 #endif /* INET */