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, NULL, 0,
 207             IPI_HASHFIELDS_2TUPLE);
 208         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 209             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 210         uma_zone_set_max(V_udpcb_zone, maxsockets);
 211         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 212         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 213             EVENTHANDLER_PRI_ANY);
 214 }
 215
 216 void
 217 udplite_init(void)
 218 {
 219
 220         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 221             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 222             0, IPI_HASHFIELDS_2TUPLE);
 223 }
 224
 225 /*
 226  * Kernel module interface for updating udpstat.  The argument is an index
 227  * into udpstat treated as an array of u_long.  While this encodes the
 228  * general layout of udpstat into the caller, it doesn't encode its location,
 229  * so that future changes to add, for example, per-CPU stats support won't
 230  * cause binary compatibility problems for kernel modules.
 231  */
 232 void
 233 kmod_udpstat_inc(int statnum)
 234 {
 235
 236         counter_u64_add(VNET(udpstat)[statnum], 1);
 237 }
 238
 239 int
 240 udp_newudpcb(struct inpcb *inp)
 241 {
 242         struct udpcb *up;
 243
 244         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 245         if (up == NULL)
 246                 return (ENOBUFS);
 247         inp->inp_ppcb = up;
 248         return (0);
 249 }
 250
 251 void
 252 udp_discardcb(struct udpcb *up)
 253 {
 254
 255         uma_zfree(V_udpcb_zone, up);
 256 }
 257
 258 #ifdef VIMAGE
 259 static void
 260 udp_destroy(void *unused __unused)
 261 {
 262
 263         in_pcbinfo_destroy(&V_udbinfo);
 264         uma_zdestroy(V_udpcb_zone);
 265 }
 266 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 267
 268 static void
 269 udplite_destroy(void *unused __unused)
 270 {
 271
 272         in_pcbinfo_destroy(&V_ulitecbinfo);
 273 }
 274 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 275     NULL);
 276 #endif
 277
 278 #ifdef INET
 279 /*
 280  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 281  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 282  * contains the source address.  If the socket ends up being an IPv6 socket,
 283  * udp_append() will convert to a sockaddr_in6 before passing the address
 284  * into the socket code.
 285  *
 286  * In the normal case udp_append() will return 0, indicating that you
 287  * must unlock the inp. However if a tunneling protocol is in place we increment
 288  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 289  * then decrement the reference count. If the inp_rele returns 1, indicating the
 290  * inp is gone, we return that to the caller to tell them *not* to unlock
 291  * the inp. In the case of multi-cast this will cause the distribution
 292  * to stop (though most tunneling protocols known currently do *not* use
 293  * multicast).
 294  */
 295 static int
 296 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 297     struct sockaddr_in *udp_in)
 298 {
 299         struct sockaddr *append_sa;
 300         struct socket *so;
 301         struct mbuf *tmpopts, *opts = NULL;
 302 #ifdef INET6
 303         struct sockaddr_in6 udp_in6;
 304 #endif
 305         struct udpcb *up;
 306
 307         INP_LOCK_ASSERT(inp);
 308
 309         /*
 310          * Engage the tunneling protocol.
 311          */
 312         up = intoudpcb(inp);
 313         if (up->u_tun_func != NULL) {
 314                 in_pcbref(inp);
 315                 INP_RUNLOCK(inp);
 316                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&udp_in[0],
 317                     up->u_tun_ctx);
 318                 INP_RLOCK(inp);
 319                 return (in_pcbrele_rlocked(inp));
 320         }
 321
 322         off += sizeof(struct udphdr);
 323
 324 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 325         /* Check AH/ESP integrity. */
 326         if (IPSEC_ENABLED(ipv4) &&
 327             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
 328                 m_freem(n);
 329                 return (0);
 330         }
 331         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
 332                 if (IPSEC_ENABLED(ipv4) &&
 333                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
 334                         return (0);     /* Consumed. */
 335         }
 336 #endif /* IPSEC */
 337 #ifdef MAC
 338         if (mac_inpcb_check_deliver(inp, n) != 0) {
 339                 m_freem(n);
 340                 return (0);
 341         }
 342 #endif /* MAC */
 343         if (inp->inp_flags & INP_CONTROLOPTS ||
 344             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 345 #ifdef INET6
 346                 if (inp->inp_vflag & INP_IPV6)
 347                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 348                 else
 349 #endif /* INET6 */
 350                         ip_savecontrol(inp, &opts, ip, n);
 351         }
 352         if ((inp->inp_vflag & INP_IPV4) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
 353                 tmpopts = sbcreatecontrol((caddr_t)&udp_in[1],
 354                         sizeof(struct sockaddr_in), IP_ORIGDSTADDR, IPPROTO_IP);
 355                 if (tmpopts) {
 356                         if (opts) {
 357                                 tmpopts->m_next = opts;
 358                                 opts = tmpopts;
 359                         } else
 360                                 opts = tmpopts;
 361                 }
 362         }
 363 #ifdef INET6
 364         if (inp->inp_vflag & INP_IPV6) {
 365                 bzero(&udp_in6, sizeof(udp_in6));
 366                 udp_in6.sin6_len = sizeof(udp_in6);
 367                 udp_in6.sin6_family = AF_INET6;
 368                 in6_sin_2_v4mapsin6(&udp_in[0], &udp_in6);
 369                 append_sa = (struct sockaddr *)&udp_in6;
 370         } else
 371 #endif /* INET6 */
 372                 append_sa = (struct sockaddr *)&udp_in[0];
 373         m_adj(n, off);
 374
 375         so = inp->inp_socket;
 376         SOCKBUF_LOCK(&so->so_rcv);
 377         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 378                 SOCKBUF_UNLOCK(&so->so_rcv);
 379                 m_freem(n);
 380                 if (opts)
 381                         m_freem(opts);
 382                 UDPSTAT_INC(udps_fullsock);
 383         } else
 384                 sorwakeup_locked(so);
 385         return (0);
 386 }
 387
 388 int
 389 udp_input(struct mbuf **mp, int *offp, int proto)
 390 {
 391         struct ip *ip;
 392         struct udphdr *uh;
 393         struct ifnet *ifp;
 394         struct inpcb *inp;
 395         uint16_t len, ip_len;
 396         struct inpcbinfo *pcbinfo;
 397         struct ip save_ip;
 398         struct sockaddr_in udp_in[2];
 399         struct mbuf *m;
 400         struct m_tag *fwd_tag;
 401         int cscov_partial, iphlen;
 402
 403         m = *mp;
 404         iphlen = *offp;
 405         ifp = m->m_pkthdr.rcvif;
 406         *mp = NULL;
 407         UDPSTAT_INC(udps_ipackets);
 408
 409         /*
 410          * Strip IP options, if any; should skip this, make available to
 411          * user, and use on returned packets, but we don't yet have a way to
 412          * check the checksum with options still present.
 413          */
 414         if (iphlen > sizeof (struct ip)) {
 415                 ip_stripoptions(m);
 416                 iphlen = sizeof(struct ip);
 417         }
 418
 419         /*
 420          * Get IP and UDP header together in first mbuf.
 421          */
 422         ip = mtod(m, struct ip *);
 423         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 424                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 425                         UDPSTAT_INC(udps_hdrops);
 426                         return (IPPROTO_DONE);
 427                 }
 428                 ip = mtod(m, struct ip *);
 429         }
 430         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 431         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 432
 433         /*
 434          * Destination port of 0 is illegal, based on RFC768.
 435          */
 436         if (uh->uh_dport == 0)
 437                 goto badunlocked;
 438
 439         /*
 440          * Construct sockaddr format source address.  Stuff source address
 441          * and datagram in user buffer.
 442          */
 443         bzero(&udp_in[0], sizeof(struct sockaddr_in) * 2);
 444         udp_in[0].sin_len = sizeof(struct sockaddr_in);
 445         udp_in[0].sin_family = AF_INET;
 446         udp_in[0].sin_port = uh->uh_sport;
 447         udp_in[0].sin_addr = ip->ip_src;
 448         udp_in[1].sin_len = sizeof(struct sockaddr_in);
 449         udp_in[1].sin_family = AF_INET;
 450         udp_in[1].sin_port = uh->uh_dport;
 451         udp_in[1].sin_addr = ip->ip_dst;
 452
 453         /*
 454          * Make mbuf data length reflect UDP length.  If not enough data to
 455          * reflect UDP length, drop.
 456          */
 457         len = ntohs((u_short)uh->uh_ulen);
 458         ip_len = ntohs(ip->ip_len) - iphlen;
 459         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 460                 /* Zero means checksum over the complete packet. */
 461                 if (len == 0)
 462                         len = ip_len;
 463                 cscov_partial = 0;
 464         }
 465         if (ip_len != len) {
 466                 if (len > ip_len || len < sizeof(struct udphdr)) {
 467                         UDPSTAT_INC(udps_badlen);
 468                         goto badunlocked;
 469                 }
 470                 if (proto == IPPROTO_UDP)
 471                         m_adj(m, len - ip_len);
 472         }
 473
 474         /*
 475          * Save a copy of the IP header in case we want restore it for
 476          * sending an ICMP error message in response.
 477          */
 478         if (!V_udp_blackhole)
 479                 save_ip = *ip;
 480         else
 481                 memset(&save_ip, 0, sizeof(save_ip));
 482
 483         /*
 484          * Checksum extended UDP header and data.
 485          */
 486         if (uh->uh_sum) {
 487                 u_short uh_sum;
 488
 489                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 490                     !cscov_partial) {
 491                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 492                                 uh_sum = m->m_pkthdr.csum_data;
 493                         else
 494                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 495                                     ip->ip_dst.s_addr, htonl((u_short)len +
 496                                     m->m_pkthdr.csum_data + proto));
 497                         uh_sum ^= 0xffff;
 498                 } else {
 499                         char b[9];
 500
 501                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 502                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 503                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 504                             uh->uh_ulen : htons(ip_len);
 505                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 506                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 507                 }
 508                 if (uh_sum) {
 509                         UDPSTAT_INC(udps_badsum);
 510                         m_freem(m);
 511                         return (IPPROTO_DONE);
 512                 }
 513         } else {
 514                 if (proto == IPPROTO_UDP) {
 515                         UDPSTAT_INC(udps_nosum);
 516                 } else {
 517                         /* UDPLite requires a checksum */
 518                         /* XXX: What is the right UDPLite MIB counter here? */
 519                         m_freem(m);
 520                         return (IPPROTO_DONE);
 521                 }
 522         }
 523
 524         pcbinfo = udp_get_inpcbinfo(proto);
 525         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 526             in_broadcast(ip->ip_dst, ifp)) {
 527                 struct inpcb *last;
 528                 struct inpcbhead *pcblist;
 529                 struct ip_moptions *imo;
 530
 531                 INP_INFO_RLOCK(pcbinfo);
 532                 pcblist = udp_get_pcblist(proto);
 533                 last = NULL;
 534                 LIST_FOREACH(inp, pcblist, inp_list) {
 535                         if (inp->inp_lport != uh->uh_dport)
 536                                 continue;
 537 #ifdef INET6
 538                         if ((inp->inp_vflag & INP_IPV4) == 0)
 539                                 continue;
 540 #endif
 541                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 542                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 543                                 continue;
 544                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 545                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 546                                 continue;
 547                         if (inp->inp_fport != 0 &&
 548                             inp->inp_fport != uh->uh_sport)
 549                                 continue;
 550
 551                         INP_RLOCK(inp);
 552
 553                         /*
 554                          * XXXRW: Because we weren't holding either the inpcb
 555                          * or the hash lock when we checked for a match
 556                          * before, we should probably recheck now that the
 557                          * inpcb lock is held.
 558                          */
 559
 560                         /*
 561                          * Handle socket delivery policy for any-source
 562                          * and source-specific multicast. [RFC3678]
 563                          */
 564                         imo = inp->inp_moptions;
 565                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 566                                 struct sockaddr_in       group;
 567                                 int                      blocked;
 568                                 if (imo == NULL) {
 569                                         INP_RUNLOCK(inp);
 570                                         continue;
 571                                 }
 572                                 bzero(&group, sizeof(struct sockaddr_in));
 573                                 group.sin_len = sizeof(struct sockaddr_in);
 574                                 group.sin_family = AF_INET;
 575                                 group.sin_addr = ip->ip_dst;
 576
 577                                 blocked = imo_multi_filter(imo, ifp,
 578                                         (struct sockaddr *)&group,
 579                                         (struct sockaddr *)&udp_in[0]);
 580                                 if (blocked != MCAST_PASS) {
 581                                         if (blocked == MCAST_NOTGMEMBER)
 582                                                 IPSTAT_INC(ips_notmember);
 583                                         if (blocked == MCAST_NOTSMEMBER ||
 584                                             blocked == MCAST_MUTED)
 585                                                 UDPSTAT_INC(udps_filtermcast);
 586                                         INP_RUNLOCK(inp);
 587                                         continue;
 588                                 }
 589                         }
 590                         if (last != NULL) {
 591                                 struct mbuf *n;
 592
 593                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 594                                     NULL) {
 595                                         UDP_PROBE(receive, NULL, last, ip,
 596                                             last, uh);
 597                                         if (udp_append(last, ip, n, iphlen,
 598                                                 udp_in)) {
 599                                                 goto inp_lost;
 600                                         }
 601                                 }
 602                                 INP_RUNLOCK(last);
 603                         }
 604                         last = inp;
 605                         /*
 606                          * Don't look for additional matches if this one does
 607                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 608                          * socket options set.  This heuristic avoids
 609                          * searching through all pcbs in the common case of a
 610                          * non-shared port.  It assumes that an application
 611                          * will never clear these options after setting them.
 612                          */
 613                         if ((last->inp_socket->so_options &
 614                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 615                                 break;
 616                 }
 617
 618                 if (last == NULL) {
 619                         /*
 620                          * No matching pcb found; discard datagram.  (No need
 621                          * to send an ICMP Port Unreachable for a broadcast
 622                          * or multicast datgram.)
 623                          */
 624                         UDPSTAT_INC(udps_noportbcast);
 625                         if (inp)
 626                                 INP_RUNLOCK(inp);
 627                         INP_INFO_RUNLOCK(pcbinfo);
 628                         goto badunlocked;
 629                 }
 630                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 631                 if (udp_append(last, ip, m, iphlen, udp_in) == 0)
 632                         INP_RUNLOCK(last);
 633         inp_lost:
 634                 INP_INFO_RUNLOCK(pcbinfo);
 635                 return (IPPROTO_DONE);
 636         }
 637
 638         /*
 639          * Locate pcb for datagram.
 640          */
 641
 642         /*
 643          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 644          */
 645         if ((m->m_flags & M_IP_NEXTHOP) &&
 646             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 647                 struct sockaddr_in *next_hop;
 648
 649                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 650
 651                 /*
 652                  * Transparently forwarded. Pretend to be the destination.
 653                  * Already got one like this?
 654                  */
 655                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 656                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 657                 if (!inp) {
 658                         /*
 659                          * It's new.  Try to find the ambushing socket.
 660                          * Because we've rewritten the destination address,
 661                          * any hardware-generated hash is ignored.
 662                          */
 663                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 664                             uh->uh_sport, next_hop->sin_addr,
 665                             next_hop->sin_port ? htons(next_hop->sin_port) :
 666                             uh->uh_dport, INPLOOKUP_WILDCARD |
 667                             INPLOOKUP_RLOCKPCB, ifp);
 668                 }
 669                 /* Remove the tag from the packet. We don't need it anymore. */
 670                 m_tag_delete(m, fwd_tag);
 671                 m->m_flags &= ~M_IP_NEXTHOP;
 672         } else
 673                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 674                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 675                     INPLOOKUP_RLOCKPCB, ifp, m);
 676         if (inp == NULL) {
 677                 if (udp_log_in_vain) {
 678                         char src[INET_ADDRSTRLEN];
 679                         char dst[INET_ADDRSTRLEN];
 680
 681                         log(LOG_INFO,
 682                             "Connection attempt to UDP %s:%d from %s:%d\n",
 683                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
 684                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
 685                 }
 686                 UDPSTAT_INC(udps_noport);
 687                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 688                         UDPSTAT_INC(udps_noportbcast);
 689                         goto badunlocked;
 690                 }
 691                 if (V_udp_blackhole)
 692                         goto badunlocked;
 693                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 694                         goto badunlocked;
 695                 *ip = save_ip;
 696                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 697                 return (IPPROTO_DONE);
 698         }
 699
 700         /*
 701          * Check the minimum TTL for socket.
 702          */
 703         INP_RLOCK_ASSERT(inp);
 704         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 705                 INP_RUNLOCK(inp);
 706                 m_freem(m);
 707                 return (IPPROTO_DONE);
 708         }
 709         if (cscov_partial) {
 710                 struct udpcb *up;
 711
 712                 up = intoudpcb(inp);
 713                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 714                         INP_RUNLOCK(inp);
 715                         m_freem(m);
 716                         return (IPPROTO_DONE);
 717                 }
 718         }
 719
 720         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 721         if (udp_append(inp, ip, m, iphlen, udp_in) == 0)
 722                 INP_RUNLOCK(inp);
 723         return (IPPROTO_DONE);
 724
 725 badunlocked:
 726         m_freem(m);
 727         return (IPPROTO_DONE);
 728 }
 729 #endif /* INET */
 730
 731 /*
 732  * Notify a udp user of an asynchronous error; just wake up so that they can
 733  * collect error status.
 734  */
 735 struct inpcb *
 736 udp_notify(struct inpcb *inp, int errno)
 737 {
 738
 739         /*
 740          * While udp_ctlinput() always calls udp_notify() with a read lock
 741          * when invoking it directly, in_pcbnotifyall() currently uses write
 742          * locks due to sharing code with TCP.  For now, accept either a read
 743          * or a write lock, but a read lock is sufficient.
 744          */
 745         INP_LOCK_ASSERT(inp);
 746         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 747              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 748                 RTFREE(inp->inp_route.ro_rt);
 749                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 750         }
 751
 752         inp->inp_socket->so_error = errno;
 753         sorwakeup(inp->inp_socket);
 754         sowwakeup(inp->inp_socket);
 755         return (inp);
 756 }
 757
 758 #ifdef INET
 759 static void
 760 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 761     struct inpcbinfo *pcbinfo)
 762 {
 763         struct ip *ip = vip;
 764         struct udphdr *uh;
 765         struct in_addr faddr;
 766         struct inpcb *inp;
 767
 768         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 769         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 770                 return;
 771
 772         if (PRC_IS_REDIRECT(cmd)) {
 773                 /* signal EHOSTDOWN, as it flushes the cached route */
 774                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 775                 return;
 776         }
 777
 778         /*
 779          * Hostdead is ugly because it goes linearly through all PCBs.
 780          *
 781          * XXX: We never get this from ICMP, otherwise it makes an excellent
 782          * DoS attack on machines with many connections.
 783          */
 784         if (cmd == PRC_HOSTDEAD)
 785                 ip = NULL;
 786         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 787                 return;
 788         if (ip != NULL) {
 789                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 790                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 791                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 792                 if (inp != NULL) {
 793                         INP_RLOCK_ASSERT(inp);
 794                         if (inp->inp_socket != NULL) {
 795                                 udp_notify(inp, inetctlerrmap[cmd]);
 796                         }
 797                         INP_RUNLOCK(inp);
 798                 } else {
 799                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 800                                            ip->ip_src, uh->uh_sport,
 801                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 802                         if (inp != NULL) {
 803                                 struct udpcb *up;
 804
 805                                 up = intoudpcb(inp);
 806                                 if (up->u_icmp_func != NULL) {
 807                                         INP_RUNLOCK(inp);
 808                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
 809                                 } else {
 810                                         INP_RUNLOCK(inp);
 811                                 }
 812                         }
 813                 }
 814         } else
 815                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 816                     udp_notify);
 817 }
 818 void
 819 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 820 {
 821
 822         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 823 }
 824
 825 void
 826 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 827 {
 828
 829         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 830 }
 831 #endif /* INET */
 832
 833 static int
 834 udp_pcblist(SYSCTL_HANDLER_ARGS)
 835 {
 836         int error, i, n;
 837         struct inpcb *inp, **inp_list;
 838         inp_gen_t gencnt;
 839         struct xinpgen xig;
 840
 841         /*
 842          * The process of preparing the PCB list is too time-consuming and
 843          * resource-intensive to repeat twice on every request.
 844          */
 845         if (req->oldptr == 0) {
 846                 n = V_udbinfo.ipi_count;
 847                 n += imax(n / 8, 10);
 848                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 849                 return (0);
 850         }
 851
 852         if (req->newptr != 0)
 853                 return (EPERM);
 854
 855         /*
 856          * OK, now we're committed to doing something.
 857          */
 858         INP_INFO_RLOCK(&V_udbinfo);
 859         gencnt = V_udbinfo.ipi_gencnt;
 860         n = V_udbinfo.ipi_count;
 861         INP_INFO_RUNLOCK(&V_udbinfo);
 862
 863         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 864                 + n * sizeof(struct xinpcb));
 865         if (error != 0)
 866                 return (error);
 867
 868         xig.xig_len = sizeof xig;
 869         xig.xig_count = n;
 870         xig.xig_gen = gencnt;
 871         xig.xig_sogen = so_gencnt;
 872         error = SYSCTL_OUT(req, &xig, sizeof xig);
 873         if (error)
 874                 return (error);
 875
 876         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 877         if (inp_list == NULL)
 878                 return (ENOMEM);
 879
 880         INP_INFO_RLOCK(&V_udbinfo);
 881         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 882              inp = 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         INP_INFO_WLOCK(&V_udbinfo);
 908         for (i = 0; i < n; i++) {
 909                 inp = inp_list[i];
 910                 INP_RLOCK(inp);
 911                 if (!in_pcbrele_rlocked(inp))
 912                         INP_RUNLOCK(inp);
 913         }
 914         INP_INFO_WUNLOCK(&V_udbinfo);
 915
 916         if (!error) {
 917                 /*
 918                  * Give the user an updated idea of our state.  If the
 919                  * generation differs from what we told her before, she knows
 920                  * that something happened while we were processing this
 921                  * request, and it might be necessary to retry.
 922                  */
 923                 INP_INFO_RLOCK(&V_udbinfo);
 924                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 925                 xig.xig_sogen = so_gencnt;
 926                 xig.xig_count = V_udbinfo.ipi_count;
 927                 INP_INFO_RUNLOCK(&V_udbinfo);
 928                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 929         }
 930         free(inp_list, M_TEMP);
 931         return (error);
 932 }
 933
 934 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 935     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 936     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 937
 938 #ifdef INET
 939 static int
 940 udp_getcred(SYSCTL_HANDLER_ARGS)
 941 {
 942         struct xucred xuc;
 943         struct sockaddr_in addrs[2];
 944         struct inpcb *inp;
 945         int error;
 946
 947         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 948         if (error)
 949                 return (error);
 950         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 951         if (error)
 952                 return (error);
 953         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 954             addrs[0].sin_addr, addrs[0].sin_port,
 955             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 956         if (inp != NULL) {
 957                 INP_RLOCK_ASSERT(inp);
 958                 if (inp->inp_socket == NULL)
 959                         error = ENOENT;
 960                 if (error == 0)
 961                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 962                 if (error == 0)
 963                         cru2x(inp->inp_cred, &xuc);
 964                 INP_RUNLOCK(inp);
 965         } else
 966                 error = ENOENT;
 967         if (error == 0)
 968                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 969         return (error);
 970 }
 971
 972 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 973     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 974     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 975 #endif /* INET */
 976
 977 int
 978 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 979 {
 980         struct inpcb *inp;
 981         struct udpcb *up;
 982         int isudplite, error, optval;
 983
 984         error = 0;
 985         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 986         inp = sotoinpcb(so);
 987         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 988         INP_WLOCK(inp);
 989         if (sopt->sopt_level != so->so_proto->pr_protocol) {
 990 #ifdef INET6
 991                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
 992                         INP_WUNLOCK(inp);
 993                         error = ip6_ctloutput(so, sopt);
 994                 }
 995 #endif
 996 #if defined(INET) && defined(INET6)
 997                 else
 998 #endif
 999 #ifdef INET
1000                 {
1001                         INP_WUNLOCK(inp);
1002                         error = ip_ctloutput(so, sopt);
1003                 }
1004 #endif
1005                 return (error);
1006         }
1007
1008         switch (sopt->sopt_dir) {
1009         case SOPT_SET:
1010                 switch (sopt->sopt_name) {
1011 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1012 #ifdef INET
1013                 case UDP_ENCAP:
1014                         if (!IPSEC_ENABLED(ipv4)) {
1015                                 INP_WUNLOCK(inp);
1016                                 return (ENOPROTOOPT);
1017                         }
1018                         error = UDPENCAP_PCBCTL(inp, sopt);
1019                         break;
1020 #endif /* INET */
1021 #endif /* IPSEC */
1022                 case UDPLITE_SEND_CSCOV:
1023                 case UDPLITE_RECV_CSCOV:
1024                         if (!isudplite) {
1025                                 INP_WUNLOCK(inp);
1026                                 error = ENOPROTOOPT;
1027                                 break;
1028                         }
1029                         INP_WUNLOCK(inp);
1030                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1031                             sizeof(optval));
1032                         if (error != 0)
1033                                 break;
1034                         inp = sotoinpcb(so);
1035                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1036                         INP_WLOCK(inp);
1037                         up = intoudpcb(inp);
1038                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1039                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1040                                 INP_WUNLOCK(inp);
1041                                 error = EINVAL;
1042                                 break;
1043                         }
1044                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1045                                 up->u_txcslen = optval;
1046                         else
1047                                 up->u_rxcslen = optval;
1048                         INP_WUNLOCK(inp);
1049                         break;
1050                 default:
1051                         INP_WUNLOCK(inp);
1052                         error = ENOPROTOOPT;
1053                         break;
1054                 }
1055                 break;
1056         case SOPT_GET:
1057                 switch (sopt->sopt_name) {
1058 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1059 #ifdef INET
1060                 case UDP_ENCAP:
1061                         if (!IPSEC_ENABLED(ipv4)) {
1062                                 INP_WUNLOCK(inp);
1063                                 return (ENOPROTOOPT);
1064                         }
1065                         error = UDPENCAP_PCBCTL(inp, sopt);
1066                         break;
1067 #endif /* INET */
1068 #endif /* IPSEC */
1069                 case UDPLITE_SEND_CSCOV:
1070                 case UDPLITE_RECV_CSCOV:
1071                         if (!isudplite) {
1072                                 INP_WUNLOCK(inp);
1073                                 error = ENOPROTOOPT;
1074                                 break;
1075                         }
1076                         up = intoudpcb(inp);
1077                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1078                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1079                                 optval = up->u_txcslen;
1080                         else
1081                                 optval = up->u_rxcslen;
1082                         INP_WUNLOCK(inp);
1083                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1084                         break;
1085                 default:
1086                         INP_WUNLOCK(inp);
1087                         error = ENOPROTOOPT;
1088                         break;
1089                 }
1090                 break;
1091         }
1092         return (error);
1093 }
1094
1095 #ifdef INET
1096 #define UH_WLOCKED      2
1097 #define UH_RLOCKED      1
1098 #define UH_UNLOCKED     0
1099 static int
1100 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1101     struct mbuf *control, struct thread *td)
1102 {
1103         struct udpiphdr *ui;
1104         int len = m->m_pkthdr.len;
1105         struct in_addr faddr, laddr;
1106         struct cmsghdr *cm;
1107         struct inpcbinfo *pcbinfo;
1108         struct sockaddr_in *sin, src;
1109         int cscov_partial = 0;
1110         int error = 0;
1111         int ipflags;
1112         u_short fport, lport;
1113         int unlock_udbinfo, unlock_inp;
1114         u_char tos;
1115         uint8_t pr;
1116         uint16_t cscov = 0;
1117         uint32_t flowid = 0;
1118         uint8_t flowtype = M_HASHTYPE_NONE;
1119
1120         /*
1121          * udp_output() may need to temporarily bind or connect the current
1122          * inpcb.  As such, we don't know up front whether we will need the
1123          * pcbinfo lock or not.  Do any work to decide what is needed up
1124          * front before acquiring any locks.
1125          */
1126         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1127                 if (control)
1128                         m_freem(control);
1129                 m_freem(m);
1130                 return (EMSGSIZE);
1131         }
1132
1133         src.sin_family = 0;
1134         sin = (struct sockaddr_in *)addr;
1135         if (sin == NULL ||
1136             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1137                 INP_WLOCK(inp);
1138                 unlock_inp = UH_WLOCKED;
1139         } else {
1140                 INP_RLOCK(inp);
1141                 unlock_inp = UH_RLOCKED;
1142         }
1143         tos = inp->inp_ip_tos;
1144         if (control != NULL) {
1145                 /*
1146                  * XXX: Currently, we assume all the optional information is
1147                  * stored in a single mbuf.
1148                  */
1149                 if (control->m_next) {
1150                         if (unlock_inp == UH_WLOCKED)
1151                                 INP_WUNLOCK(inp);
1152                         else
1153                                 INP_RUNLOCK(inp);
1154                         m_freem(control);
1155                         m_freem(m);
1156                         return (EINVAL);
1157                 }
1158                 for (; control->m_len > 0;
1159                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1160                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1161                         cm = mtod(control, struct cmsghdr *);
1162                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1163                             || cm->cmsg_len > control->m_len) {
1164                                 error = EINVAL;
1165                                 break;
1166                         }
1167                         if (cm->cmsg_level != IPPROTO_IP)
1168                                 continue;
1169
1170                         switch (cm->cmsg_type) {
1171                         case IP_SENDSRCADDR:
1172                                 if (cm->cmsg_len !=
1173                                     CMSG_LEN(sizeof(struct in_addr))) {
1174                                         error = EINVAL;
1175                                         break;
1176                                 }
1177                                 bzero(&src, sizeof(src));
1178                                 src.sin_family = AF_INET;
1179                                 src.sin_len = sizeof(src);
1180                                 src.sin_port = inp->inp_lport;
1181                                 src.sin_addr =
1182                                     *(struct in_addr *)CMSG_DATA(cm);
1183                                 break;
1184
1185                         case IP_TOS:
1186                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1187                                         error = EINVAL;
1188                                         break;
1189                                 }
1190                                 tos = *(u_char *)CMSG_DATA(cm);
1191                                 break;
1192
1193                         case IP_FLOWID:
1194                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1195                                         error = EINVAL;
1196                                         break;
1197                                 }
1198                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1199                                 break;
1200
1201                         case IP_FLOWTYPE:
1202                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1203                                         error = EINVAL;
1204                                         break;
1205                                 }
1206                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1207                                 break;
1208
1209 #ifdef  RSS
1210                         case IP_RSSBUCKETID:
1211                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1212                                         error = EINVAL;
1213                                         break;
1214                                 }
1215                                 /* This is just a placeholder for now */
1216                                 break;
1217 #endif  /* RSS */
1218                         default:
1219                                 error = ENOPROTOOPT;
1220                                 break;
1221                         }
1222                         if (error)
1223                                 break;
1224                 }
1225                 m_freem(control);
1226         }
1227         if (error) {
1228                 if (unlock_inp == UH_WLOCKED)
1229                         INP_WUNLOCK(inp);
1230                 else
1231                         INP_RUNLOCK(inp);
1232                 m_freem(m);
1233                 return (error);
1234         }
1235
1236         /*
1237          * Depending on whether or not the application has bound or connected
1238          * the socket, we may have to do varying levels of work.  The optimal
1239          * case is for a connected UDP socket, as a global lock isn't
1240          * required at all.
1241          *
1242          * In order to decide which we need, we require stability of the
1243          * inpcb binding, which we ensure by acquiring a read lock on the
1244          * inpcb.  This doesn't strictly follow the lock order, so we play
1245          * the trylock and retry game; note that we may end up with more
1246          * conservative locks than required the second time around, so later
1247          * assertions have to accept that.  Further analysis of the number of
1248          * misses under contention is required.
1249          *
1250          * XXXRW: Check that hash locking update here is correct.
1251          */
1252         pr = inp->inp_socket->so_proto->pr_protocol;
1253         pcbinfo = udp_get_inpcbinfo(pr);
1254         sin = (struct sockaddr_in *)addr;
1255         if (sin != NULL &&
1256             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1257                 INP_HASH_WLOCK(pcbinfo);
1258                 unlock_udbinfo = UH_WLOCKED;
1259         } else if ((sin != NULL && (
1260             (sin->sin_addr.s_addr == INADDR_ANY) ||
1261             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1262             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1263             (inp->inp_lport == 0))) ||
1264             (src.sin_family == AF_INET)) {
1265                 INP_HASH_RLOCK(pcbinfo);
1266                 unlock_udbinfo = UH_RLOCKED;
1267         } else
1268                 unlock_udbinfo = UH_UNLOCKED;
1269
1270         /*
1271          * If the IP_SENDSRCADDR control message was specified, override the
1272          * source address for this datagram.  Its use is invalidated if the
1273          * address thus specified is incomplete or clobbers other inpcbs.
1274          */
1275         laddr = inp->inp_laddr;
1276         lport = inp->inp_lport;
1277         if (src.sin_family == AF_INET) {
1278                 INP_HASH_LOCK_ASSERT(pcbinfo);
1279                 if ((lport == 0) ||
1280                     (laddr.s_addr == INADDR_ANY &&
1281                      src.sin_addr.s_addr == INADDR_ANY)) {
1282                         error = EINVAL;
1283                         goto release;
1284                 }
1285                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1286                     &laddr.s_addr, &lport, td->td_ucred);
1287                 if (error)
1288                         goto release;
1289         }
1290
1291         /*
1292          * If a UDP socket has been connected, then a local address/port will
1293          * have been selected and bound.
1294          *
1295          * If a UDP socket has not been connected to, then an explicit
1296          * destination address must be used, in which case a local
1297          * address/port may not have been selected and bound.
1298          */
1299         if (sin != NULL) {
1300                 INP_LOCK_ASSERT(inp);
1301                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1302                         error = EISCONN;
1303                         goto release;
1304                 }
1305
1306                 /*
1307                  * Jail may rewrite the destination address, so let it do
1308                  * that before we use it.
1309                  */
1310                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1311                 if (error)
1312                         goto release;
1313
1314                 /*
1315                  * If a local address or port hasn't yet been selected, or if
1316                  * the destination address needs to be rewritten due to using
1317                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1318                  * to do the heavy lifting.  Once a port is selected, we
1319                  * commit the binding back to the socket; we also commit the
1320                  * binding of the address if in jail.
1321                  *
1322                  * If we already have a valid binding and we're not
1323                  * requesting a destination address rewrite, use a fast path.
1324                  */
1325                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1326                     inp->inp_lport == 0 ||
1327                     sin->sin_addr.s_addr == INADDR_ANY ||
1328                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1329                         INP_HASH_LOCK_ASSERT(pcbinfo);
1330                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1331                             &lport, &faddr.s_addr, &fport, NULL,
1332                             td->td_ucred);
1333                         if (error)
1334                                 goto release;
1335
1336                         /*
1337                          * XXXRW: Why not commit the port if the address is
1338                          * !INADDR_ANY?
1339                          */
1340                         /* Commit the local port if newly assigned. */
1341                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1342                             inp->inp_lport == 0) {
1343                                 INP_WLOCK_ASSERT(inp);
1344                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1345                                 /*
1346                                  * Remember addr if jailed, to prevent
1347                                  * rebinding.
1348                                  */
1349                                 if (prison_flag(td->td_ucred, PR_IP4))
1350                                         inp->inp_laddr = laddr;
1351                                 inp->inp_lport = lport;
1352                                 if (in_pcbinshash(inp) != 0) {
1353                                         inp->inp_lport = 0;
1354                                         error = EAGAIN;
1355                                         goto release;
1356                                 }
1357                                 inp->inp_flags |= INP_ANONPORT;
1358                         }
1359                 } else {
1360                         faddr = sin->sin_addr;
1361                         fport = sin->sin_port;
1362                 }
1363         } else {
1364                 INP_LOCK_ASSERT(inp);
1365                 faddr = inp->inp_faddr;
1366                 fport = inp->inp_fport;
1367                 if (faddr.s_addr == INADDR_ANY) {
1368                         error = ENOTCONN;
1369                         goto release;
1370                 }
1371         }
1372
1373         /*
1374          * Calculate data length and get a mbuf for UDP, IP, and possible
1375          * link-layer headers.  Immediate slide the data pointer back forward
1376          * since we won't use that space at this layer.
1377          */
1378         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1379         if (m == NULL) {
1380                 error = ENOBUFS;
1381                 goto release;
1382         }
1383         m->m_data += max_linkhdr;
1384         m->m_len -= max_linkhdr;
1385         m->m_pkthdr.len -= max_linkhdr;
1386
1387         /*
1388          * Fill in mbuf with extended UDP header and addresses and length put
1389          * into network format.
1390          */
1391         ui = mtod(m, struct udpiphdr *);
1392         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1393         ui->ui_pr = pr;
1394         ui->ui_src = laddr;
1395         ui->ui_dst = faddr;
1396         ui->ui_sport = lport;
1397         ui->ui_dport = fport;
1398         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1399         if (pr == IPPROTO_UDPLITE) {
1400                 struct udpcb *up;
1401                 uint16_t plen;
1402
1403                 up = intoudpcb(inp);
1404                 cscov = up->u_txcslen;
1405                 plen = (u_short)len + sizeof(struct udphdr);
1406                 if (cscov >= plen)
1407                         cscov = 0;
1408                 ui->ui_len = htons(plen);
1409                 ui->ui_ulen = htons(cscov);
1410                 /*
1411                  * For UDP-Lite, checksum coverage length of zero means
1412                  * the entire UDPLite packet is covered by the checksum.
1413                  */
1414                 cscov_partial = (cscov == 0) ? 0 : 1;
1415         } else
1416                 ui->ui_v = IPVERSION << 4;
1417
1418         /*
1419          * Set the Don't Fragment bit in the IP header.
1420          */
1421         if (inp->inp_flags & INP_DONTFRAG) {
1422                 struct ip *ip;
1423
1424                 ip = (struct ip *)&ui->ui_i;
1425                 ip->ip_off |= htons(IP_DF);
1426         }
1427
1428         ipflags = 0;
1429         if (inp->inp_socket->so_options & SO_DONTROUTE)
1430                 ipflags |= IP_ROUTETOIF;
1431         if (inp->inp_socket->so_options & SO_BROADCAST)
1432                 ipflags |= IP_ALLOWBROADCAST;
1433         if (inp->inp_flags & INP_ONESBCAST)
1434                 ipflags |= IP_SENDONES;
1435
1436 #ifdef MAC
1437         mac_inpcb_create_mbuf(inp, m);
1438 #endif
1439
1440         /*
1441          * Set up checksum and output datagram.
1442          */
1443         ui->ui_sum = 0;
1444         if (pr == IPPROTO_UDPLITE) {
1445                 if (inp->inp_flags & INP_ONESBCAST)
1446                         faddr.s_addr = INADDR_BROADCAST;
1447                 if (cscov_partial) {
1448                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1449                                 ui->ui_sum = 0xffff;
1450                 } else {
1451                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1452                                 ui->ui_sum = 0xffff;
1453                 }
1454         } else if (V_udp_cksum) {
1455                 if (inp->inp_flags & INP_ONESBCAST)
1456                         faddr.s_addr = INADDR_BROADCAST;
1457                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1458                     htons((u_short)len + sizeof(struct udphdr) + pr));
1459                 m->m_pkthdr.csum_flags = CSUM_UDP;
1460                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1461         }
1462         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1463         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1464         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1465         UDPSTAT_INC(udps_opackets);
1466
1467         /*
1468          * Setup flowid / RSS information for outbound socket.
1469          *
1470          * Once the UDP code decides to set a flowid some other way,
1471          * this allows the flowid to be overridden by userland.
1472          */
1473         if (flowtype != M_HASHTYPE_NONE) {
1474                 m->m_pkthdr.flowid = flowid;
1475                 M_HASHTYPE_SET(m, flowtype);
1476 #ifdef  RSS
1477         } else {
1478                 uint32_t hash_val, hash_type;
1479                 /*
1480                  * Calculate an appropriate RSS hash for UDP and
1481                  * UDP Lite.
1482                  *
1483                  * The called function will take care of figuring out
1484                  * whether a 2-tuple or 4-tuple hash is required based
1485                  * on the currently configured scheme.
1486                  *
1487                  * Later later on connected socket values should be
1488                  * cached in the inpcb and reused, rather than constantly
1489                  * re-calculating it.
1490                  *
1491                  * UDP Lite is a different protocol number and will
1492                  * likely end up being hashed as a 2-tuple until
1493                  * RSS / NICs grow UDP Lite protocol awareness.
1494                  */
1495                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1496                     pr, &hash_val, &hash_type) == 0) {
1497                         m->m_pkthdr.flowid = hash_val;
1498                         M_HASHTYPE_SET(m, hash_type);
1499                 }
1500 #endif
1501         }
1502
1503 #ifdef  RSS
1504         /*
1505          * Don't override with the inp cached flowid value.
1506          *
1507          * Depending upon the kind of send being done, the inp
1508          * flowid/flowtype values may actually not be appropriate
1509          * for this particular socket send.
1510          *
1511          * We should either leave the flowid at zero (which is what is
1512          * currently done) or set it to some software generated
1513          * hash value based on the packet contents.
1514          */
1515         ipflags |= IP_NODEFAULTFLOWID;
1516 #endif  /* RSS */
1517
1518         if (unlock_udbinfo == UH_WLOCKED)
1519                 INP_HASH_WUNLOCK(pcbinfo);
1520         else if (unlock_udbinfo == UH_RLOCKED)
1521                 INP_HASH_RUNLOCK(pcbinfo);
1522         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1523         error = ip_output(m, inp->inp_options,
1524             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1525             inp->inp_moptions, inp);
1526         if (unlock_inp == UH_WLOCKED)
1527                 INP_WUNLOCK(inp);
1528         else
1529                 INP_RUNLOCK(inp);
1530         return (error);
1531
1532 release:
1533         if (unlock_udbinfo == UH_WLOCKED) {
1534                 KASSERT(unlock_inp == UH_WLOCKED,
1535                     ("%s: excl udbinfo lock, shared inp lock", __func__));
1536                 INP_HASH_WUNLOCK(pcbinfo);
1537                 INP_WUNLOCK(inp);
1538         } else if (unlock_udbinfo == UH_RLOCKED) {
1539                 KASSERT(unlock_inp == UH_RLOCKED,
1540                     ("%s: shared udbinfo lock, excl inp lock", __func__));
1541                 INP_HASH_RUNLOCK(pcbinfo);
1542                 INP_RUNLOCK(inp);
1543         } else if (unlock_inp == UH_WLOCKED)
1544                 INP_WUNLOCK(inp);
1545         else
1546                 INP_RUNLOCK(inp);
1547         m_freem(m);
1548         return (error);
1549 }
1550
1551 static void
1552 udp_abort(struct socket *so)
1553 {
1554         struct inpcb *inp;
1555         struct inpcbinfo *pcbinfo;
1556
1557         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1558         inp = sotoinpcb(so);
1559         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1560         INP_WLOCK(inp);
1561         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1562                 INP_HASH_WLOCK(pcbinfo);
1563                 in_pcbdisconnect(inp);
1564                 inp->inp_laddr.s_addr = INADDR_ANY;
1565                 INP_HASH_WUNLOCK(pcbinfo);
1566                 soisdisconnected(so);
1567         }
1568         INP_WUNLOCK(inp);
1569 }
1570
1571 static int
1572 udp_attach(struct socket *so, int proto, struct thread *td)
1573 {
1574         struct inpcb *inp;
1575         struct inpcbinfo *pcbinfo;
1576         int error;
1577
1578         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1579         inp = sotoinpcb(so);
1580         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1581         error = soreserve(so, udp_sendspace, udp_recvspace);
1582         if (error)
1583                 return (error);
1584         INP_INFO_WLOCK(pcbinfo);
1585         error = in_pcballoc(so, pcbinfo);
1586         if (error) {
1587                 INP_INFO_WUNLOCK(pcbinfo);
1588                 return (error);
1589         }
1590
1591         inp = sotoinpcb(so);
1592         inp->inp_vflag |= INP_IPV4;
1593         inp->inp_ip_ttl = V_ip_defttl;
1594
1595         error = udp_newudpcb(inp);
1596         if (error) {
1597                 in_pcbdetach(inp);
1598                 in_pcbfree(inp);
1599                 INP_INFO_WUNLOCK(pcbinfo);
1600                 return (error);
1601         }
1602
1603         INP_WUNLOCK(inp);
1604         INP_INFO_WUNLOCK(pcbinfo);
1605         return (0);
1606 }
1607 #endif /* INET */
1608
1609 int
1610 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1611 {
1612         struct inpcb *inp;
1613         struct udpcb *up;
1614
1615         KASSERT(so->so_type == SOCK_DGRAM,
1616             ("udp_set_kernel_tunneling: !dgram"));
1617         inp = sotoinpcb(so);
1618         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1619         INP_WLOCK(inp);
1620         up = intoudpcb(inp);
1621         if ((up->u_tun_func != NULL) ||
1622             (up->u_icmp_func != NULL)) {
1623                 INP_WUNLOCK(inp);
1624                 return (EBUSY);
1625         }
1626         up->u_tun_func = f;
1627         up->u_icmp_func = i;
1628         up->u_tun_ctx = ctx;
1629         INP_WUNLOCK(inp);
1630         return (0);
1631 }
1632
1633 #ifdef INET
1634 static int
1635 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1636 {
1637         struct inpcb *inp;
1638         struct inpcbinfo *pcbinfo;
1639         int error;
1640
1641         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1642         inp = sotoinpcb(so);
1643         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1644         INP_WLOCK(inp);
1645         INP_HASH_WLOCK(pcbinfo);
1646         error = in_pcbbind(inp, nam, td->td_ucred);
1647         INP_HASH_WUNLOCK(pcbinfo);
1648         INP_WUNLOCK(inp);
1649         return (error);
1650 }
1651
1652 static void
1653 udp_close(struct socket *so)
1654 {
1655         struct inpcb *inp;
1656         struct inpcbinfo *pcbinfo;
1657
1658         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1659         inp = sotoinpcb(so);
1660         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1661         INP_WLOCK(inp);
1662         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1663                 INP_HASH_WLOCK(pcbinfo);
1664                 in_pcbdisconnect(inp);
1665                 inp->inp_laddr.s_addr = INADDR_ANY;
1666                 INP_HASH_WUNLOCK(pcbinfo);
1667                 soisdisconnected(so);
1668         }
1669         INP_WUNLOCK(inp);
1670 }
1671
1672 static int
1673 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1674 {
1675         struct inpcb *inp;
1676         struct inpcbinfo *pcbinfo;
1677         struct sockaddr_in *sin;
1678         int error;
1679
1680         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1681         inp = sotoinpcb(so);
1682         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1683         INP_WLOCK(inp);
1684         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1685                 INP_WUNLOCK(inp);
1686                 return (EISCONN);
1687         }
1688         sin = (struct sockaddr_in *)nam;
1689         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1690         if (error != 0) {
1691                 INP_WUNLOCK(inp);
1692                 return (error);
1693         }
1694         INP_HASH_WLOCK(pcbinfo);
1695         error = in_pcbconnect(inp, nam, td->td_ucred);
1696         INP_HASH_WUNLOCK(pcbinfo);
1697         if (error == 0)
1698                 soisconnected(so);
1699         INP_WUNLOCK(inp);
1700         return (error);
1701 }
1702
1703 static void
1704 udp_detach(struct socket *so)
1705 {
1706         struct inpcb *inp;
1707         struct inpcbinfo *pcbinfo;
1708         struct udpcb *up;
1709
1710         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1711         inp = sotoinpcb(so);
1712         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1713         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1714             ("udp_detach: not disconnected"));
1715         INP_INFO_WLOCK(pcbinfo);
1716         INP_WLOCK(inp);
1717         up = intoudpcb(inp);
1718         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1719         inp->inp_ppcb = NULL;
1720         in_pcbdetach(inp);
1721         in_pcbfree(inp);
1722         INP_INFO_WUNLOCK(pcbinfo);
1723         udp_discardcb(up);
1724 }
1725
1726 static int
1727 udp_disconnect(struct socket *so)
1728 {
1729         struct inpcb *inp;
1730         struct inpcbinfo *pcbinfo;
1731
1732         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1733         inp = sotoinpcb(so);
1734         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1735         INP_WLOCK(inp);
1736         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1737                 INP_WUNLOCK(inp);
1738                 return (ENOTCONN);
1739         }
1740         INP_HASH_WLOCK(pcbinfo);
1741         in_pcbdisconnect(inp);
1742         inp->inp_laddr.s_addr = INADDR_ANY;
1743         INP_HASH_WUNLOCK(pcbinfo);
1744         SOCK_LOCK(so);
1745         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1746         SOCK_UNLOCK(so);
1747         INP_WUNLOCK(inp);
1748         return (0);
1749 }
1750
1751 static int
1752 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1753     struct mbuf *control, struct thread *td)
1754 {
1755         struct inpcb *inp;
1756
1757         inp = sotoinpcb(so);
1758         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1759         return (udp_output(inp, m, addr, control, td));
1760 }
1761 #endif /* INET */
1762
1763 int
1764 udp_shutdown(struct socket *so)
1765 {
1766         struct inpcb *inp;
1767
1768         inp = sotoinpcb(so);
1769         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1770         INP_WLOCK(inp);
1771         socantsendmore(so);
1772         INP_WUNLOCK(inp);
1773         return (0);
1774 }
1775
1776 #ifdef INET
1777 struct pr_usrreqs udp_usrreqs = {
1778         .pru_abort =            udp_abort,
1779         .pru_attach =           udp_attach,
1780         .pru_bind =             udp_bind,
1781         .pru_connect =          udp_connect,
1782         .pru_control =          in_control,
1783         .pru_detach =           udp_detach,
1784         .pru_disconnect =       udp_disconnect,
1785         .pru_peeraddr =         in_getpeeraddr,
1786         .pru_send =             udp_send,
1787         .pru_soreceive =        soreceive_dgram,
1788         .pru_sosend =           sosend_dgram,
1789         .pru_shutdown =         udp_shutdown,
1790         .pru_sockaddr =         in_getsockaddr,
1791         .pru_sosetlabel =       in_pcbsosetlabel,
1792         .pru_close =            udp_close,
1793 };
1794 #endif /* INET */