sys/netinet/udp_usrreq.c

   1 /*
   2  * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  63  * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.18 2003/01/24 05:11:34 sam Exp $
  64  */
  65
  66 #include "opt_inet6.h"
  67
  68 #include <sys/param.h>
  69 #include <sys/systm.h>
  70 #include <sys/kernel.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/proc.h>
  75 #include <sys/priv.h>
  76 #include <sys/protosw.h>
  77 #include <sys/socket.h>
  78 #include <sys/socketvar.h>
  79 #include <sys/sysctl.h>
  80 #include <sys/syslog.h>
  81 #include <sys/in_cksum.h>
  82 #include <sys/ktr.h>
  83 #include <sys/jail.h>
  84
  85 #include <sys/socketvar2.h>
  86 #include <sys/serialize.h>
  87
  88 #include <machine/stdarg.h>
  89
  90 #include <net/if.h>
  91 #include <net/route.h>
  92 #include <net/netmsg2.h>
  93 #include <net/netisr2.h>
  94
  95 #include <netinet/in.h>
  96 #include <netinet/in_systm.h>
  97 #include <netinet/ip.h>
  98 #ifdef INET6
  99 #include <netinet/ip6.h>
 100 #endif
 101 #include <netinet/in_pcb.h>
 102 #include <netinet/in_var.h>
 103 #include <netinet/ip_var.h>
 104 #ifdef INET6
 105 #include <netinet6/ip6_var.h>
 106 #endif
 107 #include <netinet/ip_icmp.h>
 108 #include <netinet/icmp_var.h>
 109 #include <netinet/udp.h>
 110 #include <netinet/udp_var.h>
 111
 112 #define MSGF_UDP_SEND           MSGF_PROTO1
 113
 114 #define INP_DIRECT_DETACH       INP_FLAG_PROTO2
 115
 116 #define UDP_KTR_STRING          "inp=%p"
 117 #define UDP_KTR_ARGS            struct inpcb *inp
 118
 119 #ifndef KTR_UDP
 120 #define KTR_UDP                 KTR_ALL
 121 #endif
 122
 123 KTR_INFO_MASTER(udp);
 124 KTR_INFO(KTR_UDP, udp, send_beg, 0, UDP_KTR_STRING, UDP_KTR_ARGS);
 125 KTR_INFO(KTR_UDP, udp, send_end, 1, UDP_KTR_STRING, UDP_KTR_ARGS);
 126 KTR_INFO(KTR_UDP, udp, send_ipout, 2, UDP_KTR_STRING, UDP_KTR_ARGS);
 127 KTR_INFO(KTR_UDP, udp, redisp_ipout_beg, 3, UDP_KTR_STRING, UDP_KTR_ARGS);
 128 KTR_INFO(KTR_UDP, udp, redisp_ipout_end, 4, UDP_KTR_STRING, UDP_KTR_ARGS);
 129 KTR_INFO(KTR_UDP, udp, send_redisp, 5, UDP_KTR_STRING, UDP_KTR_ARGS);
 130 KTR_INFO(KTR_UDP, udp, send_inswildcard, 6, UDP_KTR_STRING, UDP_KTR_ARGS);
 131
 132 #define logudp(name, inp)       KTR_LOG(udp_##name, inp)
 133
 134 /*
 135  * UDP protocol implementation.
 136  * Per RFC 768, August, 1980.
 137  */
 138 #ifndef COMPAT_42
 139 static int      udpcksum = 1;
 140 #else
 141 static int      udpcksum = 0;           /* XXX */
 142 #endif
 143 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
 144     &udpcksum, 0, "Enable checksumming of UDP packets");
 145
 146 int     log_in_vain = 0;
 147 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 148     &log_in_vain, 0, "Log all incoming UDP packets");
 149
 150 static int      blackhole = 0;
 151 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
 152         &blackhole, 0, "Do not send port unreachables for refused connects");
 153
 154 static int      strict_mcast_mship = 1;
 155 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
 156         &strict_mcast_mship, 0, "Only send multicast to member sockets");
 157
 158 int     udp_sosend_async = 1;
 159 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_async, CTLFLAG_RW,
 160         &udp_sosend_async, 0, "UDP asynchronized pru_send");
 161
 162 int     udp_sosend_prepend = 1;
 163 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_prepend, CTLFLAG_RW,
 164         &udp_sosend_prepend, 0,
 165         "Prepend enough space for proto and link header in pru_send");
 166
 167 static int udp_reuseport_ext = 1;
 168 SYSCTL_INT(_net_inet_udp, OID_AUTO, reuseport_ext, CTLFLAG_RW,
 169         &udp_reuseport_ext, 0, "SO_REUSEPORT extension");
 170
 171 struct  inpcbinfo udbinfo[MAXCPU];
 172
 173 #ifndef UDBHASHSIZE
 174 #define UDBHASHSIZE 16
 175 #endif
 176 CTASSERT((UDBHASHSIZE & (UDBHASHSIZE - 1)) == 0);
 177
 178 struct  udpstat udpstat_percpu[MAXCPU] __cachealign;
 179
 180 static void udp_append(struct inpcb *last, struct ip *ip,
 181     struct mbuf *n, int off, struct sockaddr_in *udp_in);
 182
 183 static int udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
 184     struct sockaddr_in *if_sin, uint16_t hash);
 185
 186 static boolean_t udp_inswildcardhash(struct inpcb *inp,
 187     struct netmsg_base *msg, int error);
 188 static void udp_remwildcardhash(struct inpcb *inp);
 189
 190 static __inline int
 191 udp_lportcpu(short lport)
 192 {
 193         return (ntohs(lport) % netisr_ncpus);
 194 }
 195
 196 void
 197 udp_init(void)
 198 {
 199         struct inpcbportinfo *portinfo;
 200         int cpu;
 201
 202         portinfo = kmalloc_cachealign(sizeof(*portinfo) * netisr_ncpus, M_PCB,
 203             M_WAITOK);
 204
 205         for (cpu = 0; cpu < netisr_ncpus; cpu++) {
 206                 struct inpcbinfo *uicb = &udbinfo[cpu];
 207
 208                 /*
 209                  * NOTE:
 210                  * UDP pcb list, wildcard hash table and localgroup hash
 211                  * table are shared.
 212                  */
 213                 in_pcbinfo_init(uicb, cpu, TRUE);
 214                 uicb->hashbase = hashinit(UDBHASHSIZE, M_PCB, &uicb->hashmask);
 215
 216                 in_pcbportinfo_init(&portinfo[cpu], UDBHASHSIZE, cpu);
 217                 in_pcbportinfo_set(uicb, portinfo, netisr_ncpus);
 218
 219                 uicb->wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
 220                     &uicb->wildcardhashmask);
 221                 uicb->localgrphashbase = hashinit(UDBHASHSIZE, M_PCB,
 222                     &uicb->localgrphashmask);
 223
 224                 uicb->ipi_size = sizeof(struct inpcb);
 225         }
 226
 227         /*
 228          * Initialize UDP statistics counters for each CPU.
 229          */
 230         for (cpu = 0; cpu < netisr_ncpus; ++cpu)
 231                 bzero(&udpstat_percpu[cpu], sizeof(struct udpstat));
 232 }
 233
 234 static int
 235 sysctl_udpstat(SYSCTL_HANDLER_ARGS)
 236 {
 237         int cpu, error = 0;
 238
 239         for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
 240                 if ((error = SYSCTL_OUT(req, &udpstat_percpu[cpu],
 241                                         sizeof(struct udpstat))))
 242                         break;
 243                 if ((error = SYSCTL_IN(req, &udpstat_percpu[cpu],
 244                                        sizeof(struct udpstat))))
 245                         break;
 246         }
 247
 248         return (error);
 249 }
 250 SYSCTL_PROC(_net_inet_udp, UDPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
 251     0, 0, sysctl_udpstat, "S,udpstat", "UDP statistics");
 252
 253 void
 254 udp_ctloutput(netmsg_t msg)
 255 {
 256         struct socket *so = msg->base.nm_so;
 257         struct sockopt *sopt = msg->ctloutput.nm_sopt;
 258         struct inpcb *inp = so->so_pcb;
 259
 260         if (inp == NULL) {
 261                 lwkt_replymsg(&msg->lmsg, EINVAL);
 262                 return;
 263         }
 264
 265         if (sopt->sopt_level == IPPROTO_IP && sopt->sopt_dir == SOPT_SET) {
 266                 switch (sopt->sopt_name) {
 267                 case IP_MULTICAST_IF:
 268                 case IP_MULTICAST_VIF:
 269                 case IP_MULTICAST_TTL:
 270                 case IP_MULTICAST_LOOP:
 271                 case IP_ADD_MEMBERSHIP:
 272                 case IP_DROP_MEMBERSHIP:
 273                         /*
 274                          * This pr_ctloutput msg will be forwarded
 275                          * to netisr0 to run; we can't do direct
 276                          * detaching anymore.
 277                          *
 278                          * NOTE:
 279                          * Don't optimize for the sockets whose
 280                          * current so_port is netisr0's msgport.
 281                          * These sockets could be connect(2)'ed
 282                          * later and the so_port will be changed.
 283                          */
 284                         inp->inp_flags &= ~INP_DIRECT_DETACH;
 285                         break;
 286                 }
 287         }
 288         return ip_ctloutput(msg);
 289 }
 290
 291 /*
 292  * Check multicast packets to make sure they are only sent to sockets with
 293  * multicast memberships for the packet's destination address and arrival
 294  * interface.  Multicast packets to multicast-unaware sockets are also
 295  * disallowed.
 296  *
 297  * Returns 0 if the packet is acceptable, -1 if it is not.
 298  */
 299 static __inline int
 300 check_multicast_membership(const struct ip *ip, const struct inpcb *inp,
 301     const struct mbuf *m)
 302 {
 303         const struct ip_moptions *mopt;
 304         int mshipno;
 305
 306         if (strict_mcast_mship == 0 ||
 307             !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 308                 return (0);
 309         }
 310
 311         ASSERT_NETISR0;
 312
 313         mopt = inp->inp_moptions;
 314         if (mopt == NULL)
 315                 return (-1);
 316         for (mshipno = 0; mshipno < mopt->imo_num_memberships; ++mshipno) {
 317                 const struct in_multi *maddr = mopt->imo_membership[mshipno];
 318
 319                 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
 320                     m->m_pkthdr.rcvif == maddr->inm_ifp) {
 321                         return (0);
 322                 }
 323         }
 324         return (-1);
 325 }
 326
 327 struct udp_mcast_arg {
 328         struct inpcb    *inp;
 329         struct inpcb    *last;
 330         struct ip       *ip;
 331         struct mbuf     *m;
 332         int             iphlen;
 333         struct sockaddr_in *udp_in;
 334 };
 335
 336 static int
 337 udp_mcast_input(struct udp_mcast_arg *arg)
 338 {
 339         struct inpcb *inp = arg->inp;
 340         struct inpcb *last = arg->last;
 341         struct ip *ip = arg->ip;
 342         struct mbuf *m = arg->m;
 343
 344         if (check_multicast_membership(ip, inp, m) < 0)
 345                 return ERESTART; /* caller continue */
 346
 347         if (last != NULL) {
 348                 struct mbuf *n;
 349
 350                 if ((n = m_copypacket(m, M_NOWAIT)) != NULL)
 351                         udp_append(last, ip, n,
 352                             arg->iphlen + sizeof(struct udphdr),
 353                             arg->udp_in);
 354         }
 355         arg->last = last = inp;
 356
 357         /*
 358          * Don't look for additional matches if this one does
 359          * not have either the SO_REUSEPORT or SO_REUSEADDR
 360          * socket options set.  This heuristic avoids searching
 361          * through all pcbs in the common case of a non-shared
 362          * port.  It * assumes that an application will never
 363          * clear these options after setting them.
 364          */
 365         if (!(last->inp_socket->so_options &
 366             (SO_REUSEPORT | SO_REUSEADDR)))
 367                 return EJUSTRETURN; /* caller stop */
 368         return 0;
 369 }
 370
 371 int
 372 udp_input(struct mbuf **mp, int *offp, int proto)
 373 {
 374         struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
 375         int iphlen;
 376         struct ip *ip;
 377         struct udphdr *uh;
 378         struct inpcb *inp;
 379         struct mbuf *m;
 380         struct mbuf *opts = NULL;
 381         int len, off;
 382         struct ip save_ip;
 383         struct inpcbinfo *pcbinfo = &udbinfo[mycpuid];
 384
 385         off = *offp;
 386         m = *mp;
 387         *mp = NULL;
 388
 389         iphlen = off;
 390         udp_stat.udps_ipackets++;
 391
 392         /*
 393          * Strip IP options, if any; should skip this,
 394          * make available to user, and use on returned packets,
 395          * but we don't yet have a way to check the checksum
 396          * with options still present.
 397          */
 398         if (iphlen > sizeof(struct ip)) {
 399                 ip_stripoptions(m);
 400                 iphlen = sizeof(struct ip);
 401         }
 402
 403         /*
 404          * IP and UDP headers are together in first mbuf.
 405          * Already checked and pulled up in ip_demux().
 406          */
 407         KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
 408             ("UDP header not in one mbuf"));
 409
 410         ip = mtod(m, struct ip *);
 411         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 412
 413         /* destination port of 0 is illegal, based on RFC768. */
 414         if (uh->uh_dport == 0)
 415                 goto bad;
 416
 417         /*
 418          * Make mbuf data length reflect UDP length.
 419          * If not enough data to reflect UDP length, drop.
 420          */
 421         len = ntohs((u_short)uh->uh_ulen);
 422         if (ip->ip_len != len) {
 423                 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
 424                         udp_stat.udps_badlen++;
 425                         goto bad;
 426                 }
 427                 m_adj(m, len - ip->ip_len);
 428                 /* ip->ip_len = len; */
 429         }
 430         /*
 431          * Save a copy of the IP header in case we want restore it
 432          * for sending an ICMP error message in response.
 433          */
 434         save_ip = *ip;
 435
 436         /*
 437          * Checksum extended UDP header and data.
 438          */
 439         if (uh->uh_sum) {
 440                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
 441                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 442                                 uh->uh_sum = m->m_pkthdr.csum_data;
 443                         else
 444                                 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
 445                                     ip->ip_dst.s_addr, htonl((u_short)len +
 446                                     m->m_pkthdr.csum_data + IPPROTO_UDP));
 447                         uh->uh_sum ^= 0xffff;
 448                 } else {
 449                         char b[9];
 450
 451                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 452                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 453                         ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
 454                         uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
 455                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 456                 }
 457                 if (uh->uh_sum) {
 458                         udp_stat.udps_badsum++;
 459                         m_freem(m);
 460                         return(IPPROTO_DONE);
 461                 }
 462         } else
 463                 udp_stat.udps_nosum++;
 464
 465         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 466             in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
 467                 struct inpcbhead *connhead;
 468                 struct inpcontainer *ic, *ic_marker;
 469                 struct inpcontainerhead *ichead;
 470                 struct udp_mcast_arg arg;
 471                 struct inpcb *last;
 472                 int error;
 473
 474                 /*
 475                  * Deliver a multicast or broadcast datagram to *all* sockets
 476                  * for which the local and remote addresses and ports match
 477                  * those of the incoming datagram.  This allows more than
 478                  * one process to receive multi/broadcasts on the same port.
 479                  * (This really ought to be done for unicast datagrams as
 480                  * well, but that would cause problems with existing
 481                  * applications that open both address-specific sockets and
 482                  * a wildcard socket listening to the same port -- they would
 483                  * end up receiving duplicates of every unicast datagram.
 484                  * Those applications open the multiple sockets to overcome an
 485                  * inadequacy of the UDP socket interface, but for backwards
 486                  * compatibility we avoid the problem here rather than
 487                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 488                  */
 489
 490                 /*
 491                  * Construct sockaddr format source address.
 492                  */
 493                 udp_in.sin_port = uh->uh_sport;
 494                 udp_in.sin_addr = ip->ip_src;
 495                 arg.udp_in = &udp_in;
 496                 /*
 497                  * Locate pcb(s) for datagram.
 498                  * (Algorithm copied from raw_intr().)
 499                  */
 500                 last = NULL;
 501                 arg.iphlen = iphlen;
 502
 503                 connhead = &pcbinfo->hashbase[
 504                     INP_PCBCONNHASH(ip->ip_src.s_addr, uh->uh_sport,
 505                     ip->ip_dst.s_addr, uh->uh_dport, pcbinfo->hashmask)];
 506                 LIST_FOREACH(inp, connhead, inp_hash) {
 507 #ifdef INET6
 508                         if (!INP_ISIPV4(inp))
 509                                 continue;
 510 #endif
 511                         if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
 512                             !in_hosteq(inp->inp_laddr, ip->ip_dst) ||
 513                             inp->inp_fport != uh->uh_sport ||
 514                             inp->inp_lport != uh->uh_dport)
 515                                 continue;
 516
 517                         arg.inp = inp;
 518                         arg.last = last;
 519                         arg.ip = ip;
 520                         arg.m = m;
 521
 522                         error = udp_mcast_input(&arg);
 523                         if (error == ERESTART)
 524                                 continue;
 525                         last = arg.last;
 526
 527                         if (error == EJUSTRETURN)
 528                                 goto done;
 529                 }
 530
 531                 ichead = &pcbinfo->wildcardhashbase[
 532                     INP_PCBWILDCARDHASH(uh->uh_dport,
 533                     pcbinfo->wildcardhashmask)];
 534                 ic_marker = in_pcbcontainer_marker();
 535
 536                 GET_PCBINFO_TOKEN(pcbinfo);
 537                 LIST_INSERT_HEAD(ichead, ic_marker, ic_list);
 538                 while ((ic = LIST_NEXT(ic_marker, ic_list)) != NULL) {
 539                         LIST_REMOVE(ic_marker, ic_list);
 540                         LIST_INSERT_AFTER(ic, ic_marker, ic_list);
 541
 542                         inp = ic->ic_inp;
 543                         if (inp->inp_flags & INP_PLACEMARKER)
 544                                 continue;
 545 #ifdef INET6
 546                         if (!INP_ISIPV4(inp))
 547                                 continue;
 548 #endif
 549                         if (inp->inp_lport != uh->uh_dport)
 550                                 continue;
 551                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 552                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 553                                 continue;
 554
 555                         arg.inp = inp;
 556                         arg.last = last;
 557                         arg.ip = ip;
 558                         arg.m = m;
 559
 560                         error = udp_mcast_input(&arg);
 561                         if (error == ERESTART)
 562                                 continue;
 563                         last = arg.last;
 564
 565                         if (error == EJUSTRETURN)
 566                                 break;
 567                 }
 568                 LIST_REMOVE(ic_marker, ic_list);
 569                 REL_PCBINFO_TOKEN(pcbinfo);
 570 done:
 571                 if (last == NULL) {
 572                         /*
 573                          * No matching pcb found; discard datagram.
 574                          * (No need to send an ICMP Port Unreachable
 575                          * for a broadcast or multicast datgram.)
 576                          */
 577                         udp_stat.udps_noportbcast++;
 578                         goto bad;
 579                 }
 580                 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
 581                     &udp_in);
 582                 return(IPPROTO_DONE);
 583         }
 584         /*
 585          * Locate pcb for datagram.
 586          */
 587         inp = in_pcblookup_pkthash(pcbinfo, ip->ip_src, uh->uh_sport,
 588             ip->ip_dst, uh->uh_dport, TRUE, m->m_pkthdr.rcvif,
 589             udp_reuseport_ext ? m : NULL);
 590         if (inp == NULL) {
 591                 if (log_in_vain) {
 592                         char src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
 593
 594                         log(LOG_INFO,
 595                             "Connection attempt to UDP %s:%d from %s:%d\n",
 596                             kinet_ntoa(ip->ip_dst, dst), ntohs(uh->uh_dport),
 597                             kinet_ntoa(ip->ip_src, src), ntohs(uh->uh_sport));
 598                 }
 599                 udp_stat.udps_noport++;
 600                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 601                         udp_stat.udps_noportbcast++;
 602                         goto bad;
 603                 }
 604                 if (blackhole)
 605                         goto bad;
 606 #ifdef ICMP_BANDLIM
 607                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 608                         goto bad;
 609 #endif
 610                 *ip = save_ip;
 611                 ip->ip_len += iphlen;
 612                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 613                 return(IPPROTO_DONE);
 614         }
 615         KASSERT(INP_ISIPV4(inp), ("not inet inpcb"));
 616         /*
 617          * Check the minimum TTL for socket.
 618          */
 619         if (ip->ip_ttl < inp->inp_ip_minttl)
 620                 goto bad;
 621
 622         /*
 623          * Construct sockaddr format source address.
 624          * Stuff source address and datagram in user buffer.
 625          */
 626         udp_in.sin_port = uh->uh_sport;
 627         udp_in.sin_addr = ip->ip_src;
 628         if ((inp->inp_flags & INP_CONTROLOPTS) ||
 629             (inp->inp_socket->so_options & SO_TIMESTAMP))
 630                 ip_savecontrol(inp, &opts, ip, m);
 631         m_adj(m, iphlen + sizeof(struct udphdr));
 632
 633         lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
 634         if (ssb_appendaddr(&inp->inp_socket->so_rcv,
 635             (struct sockaddr *)&udp_in, m, opts) == 0) {
 636                 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 637                 udp_stat.udps_fullsock++;
 638                 goto bad;
 639         }
 640         lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 641         sorwakeup(inp->inp_socket);
 642         return(IPPROTO_DONE);
 643 bad:
 644         m_freem(m);
 645         if (opts)
 646                 m_freem(opts);
 647         return(IPPROTO_DONE);
 648 }
 649
 650 /*
 651  * subroutine of udp_input(), mainly for source code readability.
 652  * caller must properly init udp_ip6 and udp_in6 beforehand.
 653  */
 654 static void
 655 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off,
 656     struct sockaddr_in *udp_in)
 657 {
 658         struct mbuf *opts = NULL;
 659         int ret;
 660
 661         KASSERT(INP_ISIPV4(last), ("not inet inpcb"));
 662
 663         if (last->inp_flags & INP_CONTROLOPTS ||
 664             last->inp_socket->so_options & SO_TIMESTAMP)
 665                 ip_savecontrol(last, &opts, ip, n);
 666         m_adj(n, off);
 667
 668         lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
 669         ret = ssb_appendaddr(&last->inp_socket->so_rcv,
 670             (struct sockaddr *)udp_in, n, opts);
 671         lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
 672         if (ret == 0) {
 673                 m_freem(n);
 674                 if (opts)
 675                         m_freem(opts);
 676                 udp_stat.udps_fullsock++;
 677         } else {
 678                 sorwakeup(last->inp_socket);
 679         }
 680 }
 681
 682 /*
 683  * Notify a udp user of an asynchronous error;
 684  * just wake up so that he can collect error status.
 685  */
 686 void
 687 udp_notify(struct inpcb *inp, int error)
 688 {
 689         inp->inp_socket->so_error = error;
 690         sorwakeup(inp->inp_socket);
 691         sowwakeup(inp->inp_socket);
 692 }
 693
 694 struct netmsg_udp_notify {
 695         struct netmsg_base base;
 696         inp_notify_t    nm_notify;
 697         struct in_addr  nm_faddr;
 698         int             nm_arg;
 699 };
 700
 701 static void
 702 udp_notifyall_oncpu(netmsg_t msg)
 703 {
 704         struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
 705         int nextcpu, cpu = mycpuid;
 706
 707         ASSERT_NETISR_NCPUS(cpu);
 708
 709         in_pcbnotifyall(&udbinfo[cpu], nm->nm_faddr, nm->nm_arg, nm->nm_notify);
 710
 711         nextcpu = cpu + 1;
 712         if (nextcpu < netisr_ncpus)
 713                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 714         else
 715                 lwkt_replymsg(&nm->base.lmsg, 0);
 716 }
 717
 718 inp_notify_t
 719 udp_get_inpnotify(int cmd, const struct sockaddr *sa,
 720     struct ip **ip0, int *cpuid)
 721 {
 722         struct in_addr faddr;
 723         struct ip *ip = *ip0;
 724         inp_notify_t notify = udp_notify;
 725
 726         faddr = ((const struct sockaddr_in *)sa)->sin_addr;
 727         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 728                 return NULL;
 729
 730         if (PRC_IS_REDIRECT(cmd)) {
 731                 ip = NULL;
 732                 notify = in_rtchange;
 733         } else if (cmd == PRC_HOSTDEAD) {
 734                 ip = NULL;
 735         } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
 736                 return NULL;
 737         }
 738
 739         if (cpuid != NULL) {
 740                 if (ip == NULL) {
 741                         /* Go through all effective netisr CPUs. */
 742                         *cpuid = netisr_ncpus;
 743                 } else {
 744                         const struct udphdr *uh;
 745
 746                         uh = (const struct udphdr *)
 747                             ((caddr_t)ip + (ip->ip_hl << 2));
 748                         *cpuid = udp_addrcpu(faddr.s_addr, uh->uh_dport,
 749                             ip->ip_src.s_addr, uh->uh_sport);
 750                 }
 751         }
 752
 753         *ip0 = ip;
 754         return notify;
 755 }
 756
 757 void
 758 udp_ctlinput(netmsg_t msg)
 759 {
 760         struct sockaddr *sa = msg->ctlinput.nm_arg;
 761         struct ip *ip = msg->ctlinput.nm_extra;
 762         int cmd = msg->ctlinput.nm_cmd, cpuid;
 763         inp_notify_t notify;
 764         struct in_addr faddr;
 765
 766         ASSERT_NETISR_NCPUS(mycpuid);
 767
 768         notify = udp_get_inpnotify(cmd, sa, &ip, &cpuid);
 769         if (notify == NULL)
 770                 goto done;
 771
 772         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 773         if (ip) {
 774                 const struct udphdr *uh;
 775                 struct inpcb *inp;
 776
 777                 if (cpuid != mycpuid)
 778                         goto done;
 779
 780                 uh = (const struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 781                 inp = in_pcblookup_hash(&udbinfo[mycpuid], faddr, uh->uh_dport,
 782                                         ip->ip_src, uh->uh_sport, 0, NULL);
 783                 if (inp != NULL && inp->inp_socket != NULL)
 784                         notify(inp, inetctlerrmap[cmd]);
 785         } else if (msg->ctlinput.nm_direct) {
 786                 if (cpuid != netisr_ncpus && cpuid != mycpuid)
 787                         goto done;
 788
 789                 in_pcbnotifyall(&udbinfo[mycpuid], faddr, inetctlerrmap[cmd],
 790                     notify);
 791         } else {
 792                 struct netmsg_udp_notify *nm;
 793
 794                 ASSERT_NETISR0;
 795                 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
 796                 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
 797                             0, udp_notifyall_oncpu);
 798                 nm->nm_faddr = faddr;
 799                 nm->nm_arg = inetctlerrmap[cmd];
 800                 nm->nm_notify = notify;
 801                 lwkt_sendmsg(netisr_cpuport(0), &nm->base.lmsg);
 802         }
 803 done:
 804         lwkt_replymsg(&msg->lmsg, 0);
 805 }
 806
 807 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, udbinfo, 0,
 808             in_pcblist_ncpus, "S,xinpcb", "List of active UDP sockets");
 809
 810 static int
 811 udp_getcred(SYSCTL_HANDLER_ARGS)
 812 {
 813         struct sockaddr_in addrs[2];
 814         struct ucred cred0, *cred = NULL;
 815         struct inpcb *inp;
 816         int error, cpu, origcpu;
 817
 818         error = priv_check(req->td, PRIV_ROOT);
 819         if (error)
 820                 return (error);
 821         error = SYSCTL_IN(req, addrs, sizeof addrs);
 822         if (error)
 823                 return (error);
 824
 825         origcpu = mycpuid;
 826         cpu = udp_addrcpu(addrs[1].sin_addr.s_addr, addrs[1].sin_port,
 827             addrs[0].sin_addr.s_addr, addrs[0].sin_port);
 828
 829         lwkt_migratecpu(cpu);
 830
 831         inp = in_pcblookup_hash(&udbinfo[cpu],
 832             addrs[1].sin_addr, addrs[1].sin_port,
 833             addrs[0].sin_addr, addrs[0].sin_port, TRUE, NULL);
 834         if (inp == NULL || inp->inp_socket == NULL) {
 835                 error = ENOENT;
 836         } else if (inp->inp_socket->so_cred != NULL) {
 837                 cred0 = *(inp->inp_socket->so_cred);
 838                 cred = &cred0;
 839         }
 840
 841         lwkt_migratecpu(origcpu);
 842
 843         if (error)
 844                 return error;
 845
 846         return SYSCTL_OUT(req, cred, sizeof(struct ucred));
 847 }
 848 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 849     0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
 850
 851 static void
 852 udp_send_redispatch(netmsg_t msg)
 853 {
 854         struct mbuf *m = msg->send.nm_m;
 855         int pru_flags = msg->send.nm_flags;
 856         struct inpcb *inp = msg->send.base.nm_so->so_pcb;
 857         struct mbuf *m_opt = msg->send.nm_control; /* XXX save ipopt */
 858         int flags = msg->send.nm_priv; /* ip_output flags */
 859         int error;
 860
 861         logudp(redisp_ipout_beg, inp);
 862
 863         /*
 864          * - Don't use inp route cache.  It should only be used in the
 865          *   inp owner netisr.
 866          * - Access to inp_moptions should be safe, since multicast UDP
 867          *   datagrams are redispatched to netisr0 and inp_moptions is
 868          *   changed only in netisr0.
 869          */
 870         error = ip_output(m, m_opt, NULL, flags, inp->inp_moptions, inp);
 871         if ((pru_flags & PRUS_NOREPLY) == 0)
 872                 lwkt_replymsg(&msg->send.base.lmsg, error);
 873
 874         if (m_opt != NULL) {
 875                 /* Free saved ip options, if any */
 876                 m_freem(m_opt);
 877         }
 878
 879         logudp(redisp_ipout_end, inp);
 880 }
 881
 882 static void
 883 udp_send(netmsg_t msg)
 884 {
 885         struct socket *so = msg->send.base.nm_so;
 886         struct mbuf *m = msg->send.nm_m;
 887         struct sockaddr *dstaddr = msg->send.nm_addr;
 888         int pru_flags = msg->send.nm_flags;
 889         struct inpcb *inp = so->so_pcb;
 890         struct thread *td = msg->send.nm_td;
 891         uint16_t hash;
 892         int flags;
 893
 894         struct udpiphdr *ui;
 895         int len = m->m_pkthdr.len;
 896         struct sockaddr_in *sin;        /* really is initialized before use */
 897         int error = 0, cpu;
 898
 899         KKASSERT(msg->send.nm_control == NULL);
 900
 901         logudp(send_beg, inp);
 902
 903         if (inp == NULL) {
 904                 error = EINVAL;
 905                 goto release;
 906         }
 907
 908         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
 909                 error = EMSGSIZE;
 910                 goto release;
 911         }
 912
 913         if (inp->inp_lport == 0) {      /* unbound socket */
 914                 boolean_t forwarded;
 915
 916                 error = in_pcbbind(inp, NULL, td);
 917                 if (error)
 918                         goto release;
 919
 920                 /*
 921                  * Need to call udp_send again, after this inpcb is
 922                  * inserted into wildcard hash table.
 923                  */
 924                 msg->send.base.lmsg.ms_flags |= MSGF_UDP_SEND;
 925                 forwarded = udp_inswildcardhash(inp, &msg->send.base, 0);
 926                 if (forwarded) {
 927                         /*
 928                          * The message is further forwarded, so we are
 929                          * done here.
 930                          */
 931                         logudp(send_inswildcard, inp);
 932                         return;
 933                 }
 934         }
 935
 936         if (dstaddr != NULL) {          /* destination address specified */
 937                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
 938                         /* already connected */
 939                         error = EISCONN;
 940                         goto release;
 941                 }
 942                 sin = (struct sockaddr_in *)dstaddr;
 943                 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
 944                         error = EAFNOSUPPORT; /* IPv6 only jail */
 945                         goto release;
 946                 }
 947         } else {
 948                 if (inp->inp_faddr.s_addr == INADDR_ANY) {
 949                         /* no destination specified and not already connected */
 950                         error = ENOTCONN;
 951                         goto release;
 952                 }
 953                 sin = NULL;
 954         }
 955
 956         /*
 957          * Calculate data length and get a mbuf
 958          * for UDP and IP headers.
 959          */
 960         M_PREPEND(m, sizeof(struct udpiphdr), M_NOWAIT);
 961         if (m == NULL) {
 962                 error = ENOBUFS;
 963                 goto release;
 964         }
 965
 966         /*
 967          * Fill in mbuf with extended UDP header
 968          * and addresses and length put into network format.
 969          */
 970         ui = mtod(m, struct udpiphdr *);
 971         bzero(ui->ui_x1, sizeof ui->ui_x1);     /* XXX still needed? */
 972         ui->ui_pr = IPPROTO_UDP;
 973
 974         /*
 975          * Set destination address.
 976          */
 977         if (dstaddr != NULL) {                  /* use specified destination */
 978                 ui->ui_dst = sin->sin_addr;
 979                 ui->ui_dport = sin->sin_port;
 980         } else {                                /* use connected destination */
 981                 ui->ui_dst = inp->inp_faddr;
 982                 ui->ui_dport = inp->inp_fport;
 983         }
 984
 985         /*
 986          * Set source address.
 987          */
 988         if (inp->inp_laddr.s_addr == INADDR_ANY ||
 989             IN_MULTICAST(ntohl(inp->inp_laddr.s_addr))) {
 990                 struct sockaddr_in *if_sin;
 991
 992                 if (dstaddr == NULL) {
 993                         /*
 994                          * connect() had (or should have) failed because
 995                          * the interface had no IP address, but the
 996                          * application proceeded to call send() anyways.
 997                          */
 998                         error = ENOTCONN;
 999                         goto release;
1000                 }
1001
1002                 /* Look up outgoing interface. */
1003                 error = in_pcbladdr_find(inp, dstaddr, &if_sin, td, 1);
1004                 if (error)
1005                         goto release;
1006                 ui->ui_src = if_sin->sin_addr;  /* use address of interface */
1007         } else {
1008                 ui->ui_src = inp->inp_laddr;    /* use non-null bound address */
1009         }
1010         ui->ui_sport = inp->inp_lport;
1011         KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
1012
1013         /*
1014          * Release the original thread, since it is no longer used
1015          */
1016         if (pru_flags & PRUS_HELDTD) {
1017                 lwkt_rele(td);
1018                 pru_flags &= ~PRUS_HELDTD;
1019         }
1020         /*
1021          * Free the dest address, since it is no longer needed
1022          */
1023         if (pru_flags & PRUS_FREEADDR) {
1024                 kfree(dstaddr, M_SONAME);
1025                 pru_flags &= ~PRUS_FREEADDR;
1026         }
1027
1028         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1029
1030         /*
1031          * Set up checksum and output datagram.
1032          */
1033         if (udpcksum) {
1034                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
1035                     htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
1036                 m->m_pkthdr.csum_flags = CSUM_UDP;
1037                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1038                 m->m_pkthdr.csum_thlen = sizeof(struct udphdr);
1039         } else {
1040                 ui->ui_sum = 0;
1041         }
1042         ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
1043         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1044         ((struct ip *)ui)->ip_tos = inp->inp_ip_tos;    /* XXX */
1045         udp_stat.udps_opackets++;
1046
1047         flags = IP_DEBUGROUTE |
1048             (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
1049         if (pru_flags & PRUS_DONTROUTE)
1050                 flags |= SO_DONTROUTE;
1051
1052         if (inp->inp_flags & INP_CONNECTED) {
1053                 /*
1054                  * For connected socket, this datagram has already
1055                  * been in the correct netisr; no need to rehash.
1056                  */
1057                 KASSERT(inp->inp_flags & INP_HASH, ("inpcb has no hash"));
1058                 m_sethash(m, inp->inp_hashval);
1059                 goto sendit;
1060         }
1061
1062         hash = udp_addrhash(ui->ui_dst.s_addr, ui->ui_dport,
1063             ui->ui_src.s_addr, ui->ui_sport);
1064         m_sethash(m, hash);
1065
1066         cpu = netisr_hashcpu(hash);
1067         if (cpu != mycpuid) {
1068                 struct mbuf *m_opt = NULL;
1069                 struct netmsg_pru_send *smsg;
1070                 struct lwkt_port *port = netisr_cpuport(cpu);
1071
1072                 /*
1073                  * Not on the CPU that matches this UDP datagram hash;
1074                  * redispatch to the correct CPU to do the ip_output().
1075                  */
1076                 if (inp->inp_options != NULL) {
1077                         /*
1078                          * If there are ip options, then save a copy,
1079                          * since accessing inp_options on other CPUs'
1080                          * is not safe.
1081                          *
1082                          * XXX optimize this?
1083                          */
1084                         m_opt = m_copym(inp->inp_options, 0, M_COPYALL,
1085                             M_WAITOK);
1086                 }
1087                 if ((pru_flags & PRUS_NOREPLY) == 0) {
1088                         /*
1089                          * Change some parts of the original netmsg and
1090                          * forward it to the target netisr.
1091                          *
1092                          * NOTE: so_port MUST NOT be checked in the target
1093                          * netisr.
1094                          */
1095                         smsg = &msg->send;
1096                         smsg->nm_priv = flags; /* ip_output flags */
1097                         smsg->nm_m = m;
1098                         smsg->nm_control = m_opt; /* XXX save ipopt */
1099                         smsg->base.lmsg.ms_flags |= MSGF_IGNSOPORT;
1100                         smsg->base.nm_dispatch = udp_send_redispatch;
1101                         lwkt_forwardmsg(port, &smsg->base.lmsg);
1102                 } else {
1103                         /*
1104                          * Recreate the netmsg, since the original mbuf
1105                          * could have been changed.  And send it to the
1106                          * target netisr.
1107                          *
1108                          * NOTE: so_port MUST NOT be checked in the target
1109                          * netisr.
1110                          */
1111                         smsg = &m->m_hdr.mh_sndmsg;
1112                         netmsg_init(&smsg->base, so, &netisr_apanic_rport,
1113                             MSGF_IGNSOPORT, udp_send_redispatch);
1114                         smsg->nm_priv = flags; /* ip_output flags */
1115                         smsg->nm_flags = pru_flags;
1116                         smsg->nm_m = m;
1117                         smsg->nm_control = m_opt; /* XXX save ipopt */
1118                         lwkt_sendmsg(port, &smsg->base.lmsg);
1119                 }
1120
1121                 /* This UDP datagram is redispatched; done */
1122                 logudp(send_redisp, inp);
1123                 return;
1124         }
1125
1126 sendit:
1127         logudp(send_ipout, inp);
1128         error = ip_output(m, inp->inp_options, &inp->inp_route, flags,
1129             inp->inp_moptions, inp);
1130         m = NULL;
1131
1132 release:
1133         if (m != NULL)
1134                 m_freem(m);
1135
1136         if (pru_flags & PRUS_HELDTD)
1137                 lwkt_rele(td);
1138         if (pru_flags & PRUS_FREEADDR)
1139                 kfree(dstaddr, M_SONAME);
1140         if ((pru_flags & PRUS_NOREPLY) == 0)
1141                 lwkt_replymsg(&msg->send.base.lmsg, error);
1142
1143         logudp(send_end, inp);
1144 }
1145
1146 u_long  udp_sendspace = 9216;           /* really max datagram size */
1147                                         /* 40 1K datagrams */
1148 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
1149     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
1150
1151 u_long  udp_recvspace = 40 * (1024 +
1152 #ifdef INET6
1153                                       sizeof(struct sockaddr_in6)
1154 #else
1155                                       sizeof(struct sockaddr_in)
1156 #endif
1157                                       );
1158 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1159     &udp_recvspace, 0, "Maximum incoming UDP datagram size");
1160
1161 /*
1162  * This should never happen, since UDP socket does not support
1163  * connection acception (SO_ACCEPTCONN, i.e. listen(2)).
1164  */
1165 static void
1166 udp_abort(netmsg_t msg __unused)
1167 {
1168         panic("udp_abort is called");
1169 }
1170
1171 static int
1172 udp_preattach(struct socket *so, int proto __unused, struct pru_attach_info *ai)
1173 {
1174         return soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1175 }
1176
1177 static void
1178 udp_attach(netmsg_t msg)
1179 {
1180         struct socket *so = msg->attach.base.nm_so;
1181         struct pru_attach_info *ai = msg->attach.nm_ai;
1182         struct inpcb *inp;
1183         int error;
1184
1185         KASSERT(so->so_pcb == NULL, ("udp socket attached"));
1186
1187         if (ai != NULL) {
1188                 error = udp_preattach(so, 0 /* don't care */, ai);
1189                 if (error)
1190                         goto out;
1191         } else {
1192                 /* Post attach; do nothing */
1193         }
1194
1195         error = in_pcballoc(so, &udbinfo[mycpuid]);
1196         if (error)
1197                 goto out;
1198
1199         inp = so->so_pcb;
1200         inp->inp_flags |= INP_DIRECT_DETACH;
1201         inp->inp_ip_ttl = ip_defttl;
1202         error = 0;
1203 out:
1204         lwkt_replymsg(&msg->attach.base.lmsg, error);
1205 }
1206
1207 static void
1208 udp_inswildcard_replymsg(netmsg_t msg)
1209 {
1210         lwkt_msg_t lmsg = &msg->lmsg;
1211
1212         if (lmsg->ms_flags & MSGF_UDP_SEND) {
1213                 udp_send(msg);
1214                 /* msg is replied by udp_send() */
1215         } else {
1216                 lwkt_replymsg(lmsg, lmsg->ms_error);
1217         }
1218 }
1219
1220 static void
1221 udp_soreuseport_dispatch(netmsg_t msg)
1222 {
1223         /* This inpcb has already been in the wildcard hash. */
1224         in_pcblink_flags(msg->base.nm_so->so_pcb, &udbinfo[mycpuid], 0);
1225         udp_inswildcard_replymsg(msg);
1226 }
1227
1228 static void
1229 udp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
1230 {
1231         sosetport(((struct netmsg_base *)msg)->nm_so, port);
1232 }
1233
1234 static boolean_t
1235 udp_inswildcardhash_oncpu(struct inpcb *inp, struct netmsg_base *msg)
1236 {
1237         int cpu;
1238
1239         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1240             ("not on owner cpu"));
1241
1242         in_pcbinswildcardhash(inp);
1243         for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
1244                 if (cpu == mycpuid) {
1245                         /*
1246                          * This inpcb has been inserted by the above
1247                          * in_pcbinswildcardhash().
1248                          */
1249                         continue;
1250                 }
1251                 in_pcbinswildcardhash_oncpu(inp, &udbinfo[cpu]);
1252         }
1253
1254         /* NOTE: inp_lgrpindex is _not_ assigned in jail. */
1255         if ((inp->inp_socket->so_options & SO_REUSEPORT) &&
1256             inp->inp_lgrpindex >= 0) {
1257                 /*
1258                  * For SO_REUSEPORT socket, redistribute it based on its
1259                  * local group index.
1260                  */
1261                 cpu = inp->inp_lgrpindex % netisr_ncpus;
1262                 if (cpu != mycpuid) {
1263                         struct lwkt_port *port = netisr_cpuport(cpu);
1264                         lwkt_msg_t lmsg = &msg->lmsg;
1265
1266                         /*
1267                          * We are moving the protocol processing port the
1268                          * socket is on, we have to unlink here and re-link
1269                          * on the target cpu (this inpcb is still left in
1270                          * the wildcard hash).
1271                          */
1272                         in_pcbunlink_flags(inp, &udbinfo[mycpuid], 0);
1273                         msg->nm_dispatch = udp_soreuseport_dispatch;
1274
1275                         /*
1276                          * See the related comment in tcp_usrreq.c
1277                          * tcp_connect()
1278                          */
1279                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1280                         lwkt_forwardmsg(port, lmsg);
1281                         return TRUE; /* forwarded */
1282                 }
1283         }
1284         return FALSE;
1285 }
1286
1287 static void
1288 udp_inswildcardhash_dispatch(netmsg_t msg)
1289 {
1290         struct inpcb *inp = msg->base.nm_so->so_pcb;
1291         boolean_t forwarded;
1292
1293         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1294         KASSERT(udp_lportcpu(inp->inp_lport) == mycpuid, ("not target cpu"));
1295
1296         in_pcblink(inp, &udbinfo[mycpuid]);
1297
1298         forwarded = udp_inswildcardhash_oncpu(inp, &msg->base);
1299         if (forwarded) {
1300                 /* The message is further forwarded, so we are done here. */
1301                 return;
1302         }
1303         udp_inswildcard_replymsg(msg);
1304 }
1305
1306 static boolean_t
1307 udp_inswildcardhash(struct inpcb *inp, struct netmsg_base *msg, int error)
1308 {
1309         lwkt_msg_t lmsg = &msg->lmsg;
1310         int cpu;
1311
1312         ASSERT_INP_NOTINHASH(inp);
1313
1314         /* This inpcb could no longer be directly detached */
1315         inp->inp_flags &= ~INP_DIRECT_DETACH;
1316
1317         /*
1318          * Always clear the route cache, so we don't need to
1319          * worry about any owner CPU changes later.
1320          */
1321         in_pcbresetroute(inp);
1322
1323         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1324         cpu = udp_lportcpu(inp->inp_lport);
1325
1326         lmsg->ms_error = error;
1327         if (cpu != mycpuid) {
1328                 struct lwkt_port *port = netisr_cpuport(cpu);
1329
1330                 /*
1331                  * We are moving the protocol processing port the socket
1332                  * is on, we have to unlink here and re-link on the
1333                  * target cpu.
1334                  */
1335                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1336                 msg->nm_dispatch = udp_inswildcardhash_dispatch;
1337
1338                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1339                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1340                 lwkt_forwardmsg(port, lmsg);
1341                 return TRUE; /* forwarded */
1342         }
1343
1344         return udp_inswildcardhash_oncpu(inp, msg);
1345 }
1346
1347 static void
1348 udp_bind(netmsg_t msg)
1349 {
1350         struct socket *so = msg->bind.base.nm_so;
1351         struct inpcb *inp;
1352         int error;
1353
1354         inp = so->so_pcb;
1355         if (inp) {
1356                 struct sockaddr *nam = msg->bind.nm_nam;
1357                 struct thread *td = msg->bind.nm_td;
1358                 struct sockaddr_in *sin;
1359                 lwkt_port_t port;
1360                 int cpu;
1361
1362                 /*
1363                  * Check "already bound" here (in_pcbbind() does the same
1364                  * check though), so we don't forward a connected/bound
1365                  * socket randomly which would panic in the following
1366                  * in_pcbunlink().
1367                  */
1368                 if (inp->inp_lport != 0 ||
1369                     inp->inp_laddr.s_addr != INADDR_ANY) {
1370                         error = EINVAL; /* already bound */
1371                         goto done;
1372                 }
1373
1374                 if (nam->sa_len != sizeof(*sin)) {
1375                         error = EINVAL;
1376                         goto done;
1377                 }
1378                 sin = (struct sockaddr_in *)nam;
1379
1380                 cpu = udp_lportcpu(sin->sin_port);
1381                 port = netisr_cpuport(cpu);
1382
1383                 /*
1384                  * See the related comment in tcp_usrreq.c tcp_usr_bind().
1385                  * The exception is that we use local port based netisr
1386                  * to serialize in_pcbbind().
1387                  */
1388                 if (&curthread->td_msgport != port) {
1389                         lwkt_msg_t lmsg = &msg->bind.base.lmsg;
1390
1391                         KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0,
1392                             ("already asked to relink"));
1393
1394                         in_pcbunlink(so->so_pcb, &udbinfo[mycpuid]);
1395                         msg->bind.nm_flags |= PRUB_RELINK;
1396
1397                         /*
1398                          * See the related comment in tcp_usrreq.c
1399                          * tcp_connect().
1400                          */
1401                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1402                         lwkt_forwardmsg(port, lmsg);
1403                         /* msg invalid now */
1404                         return;
1405                 }
1406                 KASSERT(so->so_port == port, ("so_port is not netisr%d", cpu));
1407
1408                 if (msg->bind.nm_flags & PRUB_RELINK) {
1409                         msg->bind.nm_flags &= ~PRUB_RELINK;
1410                         in_pcblink(so->so_pcb, &udbinfo[mycpuid]);
1411                 }
1412                 KASSERT(inp->inp_pcbinfo == &udbinfo[cpu],
1413                     ("pcbinfo is not udbinfo%d", cpu));
1414
1415                 error = in_pcbbind(inp, nam, td);
1416                 if (error == 0) {
1417                         boolean_t forwarded;
1418
1419                         if (sin->sin_addr.s_addr != INADDR_ANY)
1420                                 inp->inp_flags |= INP_WASBOUND_NOTANY;
1421
1422                         forwarded = udp_inswildcardhash(inp,
1423                             &msg->bind.base, 0);
1424                         if (forwarded) {
1425                                 /*
1426                                  * The message is further forwarded, so
1427                                  * we are done here.
1428                                  */
1429                                 return;
1430                         }
1431                 }
1432         } else {
1433                 error = EINVAL;
1434         }
1435 done:
1436         lwkt_replymsg(&msg->bind.base.lmsg, error);
1437 }
1438
1439 static int
1440 udp_preconnect(struct socket *so, const struct sockaddr *nam __unused,
1441     struct thread *td __unused)
1442 {
1443         sosetstate(so, SS_ISCONNECTED);         /* XXX */
1444         return 0;
1445 }
1446
1447 static void
1448 udp_connect(netmsg_t msg)
1449 {
1450         struct socket *so = msg->connect.base.nm_so;
1451         struct sockaddr *nam = msg->connect.nm_nam;
1452         struct thread *td = msg->connect.nm_td;
1453         struct inpcb *inp;
1454         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1455         struct sockaddr_in *if_sin;
1456         struct lwkt_port *port;
1457         uint16_t hash;
1458         int error;
1459
1460         KKASSERT(msg->connect.nm_m == NULL);
1461
1462         inp = so->so_pcb;
1463         if (inp == NULL) {
1464                 error = EINVAL;
1465                 goto out;
1466         }
1467
1468         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1469                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1470                 in_pcblink(inp, &udbinfo[mycpuid]);
1471         }
1472
1473         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1474                 error = EISCONN;
1475                 goto out;
1476         }
1477         error = 0;
1478
1479         /*
1480          * Bind if we have to
1481          */
1482         if (inp->inp_lport == 0) {
1483                 error = in_pcbbind(inp, NULL, td);
1484                 if (error)
1485                         goto out;
1486         }
1487
1488         /*
1489          * Calculate the correct protocol processing thread.  The connect
1490          * operation must run there.
1491          */
1492         error = in_pcbladdr(inp, nam, &if_sin, td);
1493         if (error)
1494                 goto out;
1495         if (!prison_remote_ip(td, nam)) {
1496                 error = EAFNOSUPPORT; /* IPv6 only jail */
1497                 goto out;
1498         }
1499
1500         hash = udp_addrhash(sin->sin_addr.s_addr, sin->sin_port,
1501             inp->inp_laddr.s_addr != INADDR_ANY ?
1502             inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, inp->inp_lport);
1503         port = netisr_hashport(hash);
1504         if (port != &curthread->td_msgport) {
1505                 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1506                 int nm_flags = PRUC_RECONNECT;
1507
1508                 /*
1509                  * in_pcbladdr() may have allocated a route entry for us
1510                  * on the current CPU, but we need a route entry on the
1511                  * inpcb's owner CPU, so free it here.
1512                  */
1513                 in_pcbresetroute(inp);
1514
1515                 if (inp->inp_flags & INP_WILDCARD) {
1516                         /*
1517                          * Remove this inpcb from the wildcard hash before
1518                          * the socket's msgport changes.
1519                          */
1520                         udp_remwildcardhash(inp);
1521                 }
1522
1523                 if (so->so_orig_port == NULL) {
1524                         /*
1525                          * First time change protocol processing port.
1526                          * Save the current port for synchronization upon
1527                          * udp_detach.
1528                          */
1529                         so->so_orig_port = &curthread->td_msgport;
1530                 } else {
1531                         /*
1532                          * We have changed protocol processing port more
1533                          * than once.  We could not do direct detach
1534                          * anymore, because we lose the track of the
1535                          * original protocol processing ports to perform
1536                          * synchronization upon udp_detach.  This should
1537                          * be rare though.
1538                          */
1539                         inp->inp_flags &= ~INP_DIRECT_DETACH;
1540                 }
1541
1542                 /*
1543                  * We are moving the protocol processing port the socket
1544                  * is on, we have to unlink here and re-link on the
1545                  * target cpu.
1546                  */
1547                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1548                 msg->connect.nm_flags |= nm_flags;
1549
1550                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1551                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1552                 lwkt_forwardmsg(port, lmsg);
1553                 /* msg invalid now */
1554                 return;
1555         }
1556         error = udp_connect_oncpu(inp, sin, if_sin, hash);
1557 out:
1558         if (msg->connect.nm_flags & PRUC_HELDTD)
1559                 lwkt_rele(td);
1560         if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1561                 if (inp->inp_lport == 0) {
1562                         /*
1563                          * As long as we have the local port, it is fine
1564                          * for connect to fail, e.g. disconnect.
1565                          */
1566                         so->so_error = error;
1567                 }
1568                 soclrstate(so, SS_ISCONNECTED);
1569                 /*
1570                  * Wake up callers blocked on this socket to make sure
1571                  * that they can see this error.
1572                  *
1573                  * NOTE:
1574                  * sodisconnected() can't be used here, which bricks
1575                  * sending and receiving.
1576                  */
1577                 wakeup(&so->so_timeo);
1578                 sowwakeup(so);
1579                 sorwakeup(so);
1580         }
1581         if (error && inp != NULL && inp->inp_lport != 0 &&
1582             (inp->inp_flags & INP_WILDCARD) == 0) {
1583                 boolean_t forwarded;
1584
1585                 /* Connect failed; put it to wildcard hash. */
1586                 forwarded = udp_inswildcardhash(inp, &msg->connect.base,
1587                     error);
1588                 if (forwarded) {
1589                         /*
1590                          * The message is further forwarded, so we are done
1591                          * here.
1592                          */
1593                         return;
1594                 }
1595         }
1596         lwkt_replymsg(&msg->connect.base.lmsg, error);
1597 }
1598
1599 static void
1600 udp_remwildcardhash(struct inpcb *inp)
1601 {
1602         int cpu;
1603
1604         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1605             ("not on owner cpu"));
1606
1607         for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
1608                 if (cpu == mycpuid) {
1609                         /*
1610                          * This inpcb will be removed by the later
1611                          * in_pcbremwildcardhash().
1612                          */
1613                         continue;
1614                 }
1615                 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpu]);
1616         }
1617         in_pcbremwildcardhash(inp);
1618 }
1619
1620 static int
1621 udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
1622     struct sockaddr_in *if_sin, uint16_t hash)
1623 {
1624         struct socket *so = inp->inp_socket;
1625         struct inpcb *oinp;
1626
1627         oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1628             sin->sin_addr, sin->sin_port,
1629             inp->inp_laddr.s_addr != INADDR_ANY ?
1630             inp->inp_laddr : if_sin->sin_addr, inp->inp_lport, FALSE, NULL);
1631         if (oinp != NULL)
1632                 return EADDRINUSE;
1633
1634         /*
1635          * No more errors can occur, finish adjusting the socket
1636          * and change the processing port to reflect the connected
1637          * socket.  Once set we can no longer safely mess with the
1638          * socket.
1639          */
1640
1641         if (inp->inp_flags & INP_WILDCARD)
1642                 udp_remwildcardhash(inp);
1643
1644         if (inp->inp_laddr.s_addr == INADDR_ANY)
1645                 inp->inp_laddr = if_sin->sin_addr;
1646         inp->inp_faddr = sin->sin_addr;
1647         inp->inp_fport = sin->sin_port;
1648         in_pcbinsconnhash(inp);
1649
1650         inp->inp_flags |= INP_HASH;
1651         inp->inp_hashval = hash;
1652
1653         soisconnected(so);
1654
1655         return 0;
1656 }
1657
1658 static void
1659 udp_detach2(struct socket *so)
1660 {
1661         in_pcbdetach(so->so_pcb);
1662         sodiscard(so);
1663         sofree(so);
1664 }
1665
1666 static void
1667 udp_detach_final_dispatch(netmsg_t msg)
1668 {
1669         udp_detach2(msg->base.nm_so);
1670 }
1671
1672 static void
1673 udp_detach_oncpu_dispatch(netmsg_t msg)
1674 {
1675         struct netmsg_base *clomsg = &msg->base;
1676         struct socket *so = clomsg->nm_so;
1677         struct inpcb *inp = so->so_pcb;
1678         struct thread *td = curthread;
1679         int nextcpu, cpuid = mycpuid;
1680
1681         KASSERT(td->td_type == TD_TYPE_NETISR, ("not in netisr"));
1682
1683         if (inp->inp_flags & INP_WILDCARD) {
1684                 /*
1685                  * This inp will be removed on the inp's
1686                  * owner CPU later, so don't do it now.
1687                  */
1688                 if (&td->td_msgport != so->so_port)
1689                         in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpuid]);
1690         }
1691
1692         if (cpuid == 0) {
1693                 /*
1694                  * Free and clear multicast socket option,
1695                  * which is only accessed in netisr0.
1696                  */
1697                 ip_freemoptions(inp->inp_moptions);
1698                 inp->inp_moptions = NULL;
1699         }
1700
1701         nextcpu = cpuid + 1;
1702         if (nextcpu < netisr_ncpus) {
1703                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &clomsg->lmsg);
1704         } else {
1705                 /*
1706                  * No one could see this inpcb now; destroy this
1707                  * inpcb in its owner netisr.
1708                  */
1709                 netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1710                     udp_detach_final_dispatch);
1711                 lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1712         }
1713 }
1714
1715 static void
1716 udp_detach_syncorig_dispatch(netmsg_t msg)
1717 {
1718         struct netmsg_base *clomsg = &msg->base;
1719         struct socket *so = clomsg->nm_so;
1720
1721         /*
1722          * Original protocol processing port is synchronized;
1723          * destroy this inpcb in its owner netisr.
1724          */
1725         netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1726             udp_detach_final_dispatch);
1727         lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1728 }
1729
1730 static void
1731 udp_detach(netmsg_t msg)
1732 {
1733         struct socket *so = msg->detach.base.nm_so;
1734         struct netmsg_base *clomsg;
1735         struct inpcb *inp;
1736
1737         inp = so->so_pcb;
1738         if (inp == NULL) {
1739                 lwkt_replymsg(&msg->detach.base.lmsg, EINVAL);
1740                 return;
1741         }
1742
1743         /*
1744          * Reply EJUSTRETURN ASAP, we will call sodiscard() and
1745          * sofree() later.
1746          */
1747         lwkt_replymsg(&msg->detach.base.lmsg, EJUSTRETURN);
1748
1749         if (netisr_ncpus == 1) {
1750                 /* Only one CPU, detach the inpcb directly. */
1751                 udp_detach2(so);
1752                 return;
1753         }
1754
1755         /*
1756          * Remove this inpcb from the inpcb list first, so that
1757          * no one could find this inpcb from the inpcb list.
1758          */
1759         in_pcbofflist(inp);
1760
1761         /*
1762          * Remove this inpcb from the local port hash directly
1763          * here, so that its bound local port could be recycled
1764          * timely.
1765          */
1766         in_pcbremporthash(inp);
1767
1768         if (inp->inp_flags & INP_DIRECT_DETACH) {
1769                 /*
1770                  * Direct detaching is allowed
1771                  */
1772                 KASSERT((inp->inp_flags & INP_WILDCARD) == 0,
1773                     ("in the wildcardhash"));
1774                 KASSERT(inp->inp_moptions == NULL, ("has mcast options"));
1775                 if (so->so_orig_port == NULL) {
1776                         udp_detach2(so);
1777                 } else {
1778                         /*
1779                          * Protocol processing port changed once, so
1780                          * we need to make sure that there are nothing
1781                          * left on the original protocol processing
1782                          * port before we destroy this socket and inpcb.
1783                          * This is more lightweight than going through
1784                          * all UDP processing netisrs.
1785                          */
1786                         clomsg = &so->so_clomsg;
1787                         netmsg_init(clomsg, so, &netisr_apanic_rport,
1788                             MSGF_IGNSOPORT, udp_detach_syncorig_dispatch);
1789                         lwkt_sendmsg(so->so_orig_port, &clomsg->lmsg);
1790                 }
1791                 return;
1792         }
1793
1794         /*
1795          * Go through netisrs which process UDP to make sure
1796          * no one could find this inpcb anymore.
1797          */
1798         clomsg = &so->so_clomsg;
1799         netmsg_init(clomsg, so, &netisr_apanic_rport, MSGF_IGNSOPORT,
1800             udp_detach_oncpu_dispatch);
1801         lwkt_sendmsg(netisr_cpuport(0), &clomsg->lmsg);
1802 }
1803
1804 static void
1805 udp_disconnect(netmsg_t msg)
1806 {
1807         struct socket *so = msg->disconnect.base.nm_so;
1808         struct inpcb *inp;
1809         boolean_t forwarded;
1810         int error = 0;
1811
1812         inp = so->so_pcb;
1813         if (inp == NULL) {
1814                 error = EINVAL;
1815                 goto out;
1816         }
1817         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1818                 error = ENOTCONN;
1819                 goto out;
1820         }
1821
1822         soclrstate(so, SS_ISCONNECTED);         /* XXX */
1823
1824         in_pcbdisconnect(inp);
1825         inp->inp_flags &= ~INP_HASH;
1826
1827         /*
1828          * Follow traditional BSD behavior and retain the local port
1829          * binding.  But, fix the old misbehavior of overwriting any
1830          * previously bound local address.
1831          */
1832         if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1833                 inp->inp_laddr.s_addr = INADDR_ANY;
1834
1835         if (so->so_state & SS_ISCLOSING) {
1836                 /*
1837                  * If this socket is being closed, there is no need
1838                  * to put this socket back into wildcard hash table.
1839                  */
1840                 error = 0;
1841                 goto out;
1842         }
1843
1844         forwarded = udp_inswildcardhash(inp, &msg->disconnect.base, 0);
1845         if (forwarded) {
1846                 /*
1847                  * The message is further forwarded, so we are done
1848                  * here.
1849                  */
1850                 return;
1851         }
1852 out:
1853         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1854 }
1855
1856 void
1857 udp_shutdown(netmsg_t msg)
1858 {
1859         struct socket *so = msg->shutdown.base.nm_so;
1860         struct inpcb *inp;
1861         int error;
1862
1863         inp = so->so_pcb;
1864         if (inp) {
1865                 socantsendmore(so);
1866                 error = 0;
1867         } else {
1868                 error = EINVAL;
1869         }
1870         lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1871 }
1872
1873 struct pr_usrreqs udp_usrreqs = {
1874         .pru_abort = udp_abort,
1875         .pru_accept = pr_generic_notsupp,
1876         .pru_attach = udp_attach,
1877         .pru_bind = udp_bind,
1878         .pru_connect = udp_connect,
1879         .pru_connect2 = pr_generic_notsupp,
1880         .pru_control = in_control_dispatch,
1881         .pru_detach = udp_detach,
1882         .pru_disconnect = udp_disconnect,
1883         .pru_listen = pr_generic_notsupp,
1884         .pru_peeraddr = in_setpeeraddr_dispatch,
1885         .pru_rcvd = pr_generic_notsupp,
1886         .pru_rcvoob = pr_generic_notsupp,
1887         .pru_send = udp_send,
1888         .pru_sense = pru_sense_null,
1889         .pru_shutdown = udp_shutdown,
1890         .pru_sockaddr = in_setsockaddr_dispatch,
1891         .pru_sosend = sosendudp,
1892         .pru_soreceive = soreceive,
1893         .pru_preconnect = udp_preconnect,
1894         .pru_preattach = udp_preattach
1895 };