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_ipsec.h"
  67 #include "opt_inet6.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/kernel.h>
  72 #include <sys/malloc.h>
  73 #include <sys/mbuf.h>
  74 #include <sys/domain.h>
  75 #include <sys/proc.h>
  76 #include <sys/priv.h>
  77 #include <sys/protosw.h>
  78 #include <sys/socket.h>
  79 #include <sys/socketvar.h>
  80 #include <sys/sysctl.h>
  81 #include <sys/syslog.h>
  82 #include <sys/in_cksum.h>
  83 #include <sys/ktr.h>
  84
  85 #include <sys/thread2.h>
  86 #include <sys/socketvar2.h>
  87 #include <sys/serialize.h>
  88
  89 #include <machine/stdarg.h>
  90
  91 #include <net/if.h>
  92 #include <net/route.h>
  93 #include <net/netmsg2.h>
  94 #include <net/netisr2.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_systm.h>
  98 #include <netinet/ip.h>
  99 #ifdef INET6
 100 #include <netinet/ip6.h>
 101 #endif
 102 #include <netinet/in_pcb.h>
 103 #include <netinet/in_var.h>
 104 #include <netinet/ip_var.h>
 105 #ifdef INET6
 106 #include <netinet6/ip6_var.h>
 107 #endif
 108 #include <netinet/ip_icmp.h>
 109 #include <netinet/icmp_var.h>
 110 #include <netinet/udp.h>
 111 #include <netinet/udp_var.h>
 112
 113 #ifdef FAST_IPSEC
 114 #include <netproto/ipsec/ipsec.h>
 115 #endif
 116
 117 #ifdef IPSEC
 118 #include <netinet6/ipsec.h>
 119 #endif
 120
 121 #define MSGF_UDP_SEND           MSGF_PROTO1
 122
 123 #define INP_DIRECT_DETACH       INP_FLAG_PROTO2
 124
 125 #define UDP_KTR_STRING          "inp=%p"
 126 #define UDP_KTR_ARGS            struct inpcb *inp
 127
 128 #ifndef KTR_UDP
 129 #define KTR_UDP                 KTR_ALL
 130 #endif
 131
 132 KTR_INFO_MASTER(udp);
 133 KTR_INFO(KTR_UDP, udp, send_beg, 0, UDP_KTR_STRING, UDP_KTR_ARGS);
 134 KTR_INFO(KTR_UDP, udp, send_end, 1, UDP_KTR_STRING, UDP_KTR_ARGS);
 135 KTR_INFO(KTR_UDP, udp, send_ipout, 2, UDP_KTR_STRING, UDP_KTR_ARGS);
 136 KTR_INFO(KTR_UDP, udp, redisp_ipout_beg, 3, UDP_KTR_STRING, UDP_KTR_ARGS);
 137 KTR_INFO(KTR_UDP, udp, redisp_ipout_end, 4, UDP_KTR_STRING, UDP_KTR_ARGS);
 138 KTR_INFO(KTR_UDP, udp, send_redisp, 5, UDP_KTR_STRING, UDP_KTR_ARGS);
 139 KTR_INFO(KTR_UDP, udp, send_inswildcard, 6, UDP_KTR_STRING, UDP_KTR_ARGS);
 140
 141 #define logudp(name, inp)       KTR_LOG(udp_##name, inp)
 142
 143 /*
 144  * UDP protocol implementation.
 145  * Per RFC 768, August, 1980.
 146  */
 147 #ifndef COMPAT_42
 148 static int      udpcksum = 1;
 149 #else
 150 static int      udpcksum = 0;           /* XXX */
 151 #endif
 152 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
 153     &udpcksum, 0, "Enable checksumming of UDP packets");
 154
 155 int     log_in_vain = 0;
 156 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 157     &log_in_vain, 0, "Log all incoming UDP packets");
 158
 159 static int      blackhole = 0;
 160 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW,
 161         &blackhole, 0, "Do not send port unreachables for refused connects");
 162
 163 static int      strict_mcast_mship = 1;
 164 SYSCTL_INT(_net_inet_udp, OID_AUTO, strict_mcast_mship, CTLFLAG_RW,
 165         &strict_mcast_mship, 0, "Only send multicast to member sockets");
 166
 167 int     udp_sosend_async = 1;
 168 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_async, CTLFLAG_RW,
 169         &udp_sosend_async, 0, "UDP asynchronized pru_send");
 170
 171 int     udp_sosend_prepend = 1;
 172 SYSCTL_INT(_net_inet_udp, OID_AUTO, sosend_prepend, CTLFLAG_RW,
 173         &udp_sosend_prepend, 0,
 174         "Prepend enough space for proto and link header in pru_send");
 175
 176 static int udp_reuseport_ext = 1;
 177 SYSCTL_INT(_net_inet_udp, OID_AUTO, reuseport_ext, CTLFLAG_RW,
 178         &udp_reuseport_ext, 0, "SO_REUSEPORT extension");
 179
 180 struct  inpcbinfo udbinfo[MAXCPU];
 181
 182 #ifndef UDBHASHSIZE
 183 #define UDBHASHSIZE 16
 184 #endif
 185
 186 struct  udpstat udpstat_percpu[MAXCPU] __cachealign;
 187
 188 static void udp_append(struct inpcb *last, struct ip *ip,
 189     struct mbuf *n, int off, struct sockaddr_in *udp_in);
 190
 191 static int udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
 192     struct sockaddr_in *if_sin);
 193
 194 static boolean_t udp_inswildcardhash(struct inpcb *inp,
 195     struct netmsg_base *msg, int error);
 196 static void udp_remwildcardhash(struct inpcb *inp);
 197
 198 static __inline int
 199 udp_lportcpu(short lport)
 200 {
 201         return (ntohs(lport) & ncpus2_mask);
 202 }
 203
 204 void
 205 udp_init(void)
 206 {
 207         struct inpcbportinfo *portinfo;
 208         int cpu;
 209
 210         portinfo = kmalloc_cachealign(sizeof(*portinfo) * ncpus2, M_PCB,
 211             M_WAITOK);
 212
 213         for (cpu = 0; cpu < ncpus2; cpu++) {
 214                 struct inpcbinfo *uicb = &udbinfo[cpu];
 215
 216                 /*
 217                  * NOTE:
 218                  * UDP pcb list, wildcard hash table and localgroup hash
 219                  * table are shared.
 220                  */
 221                 in_pcbinfo_init(uicb, cpu, TRUE);
 222                 uicb->hashbase = hashinit(UDBHASHSIZE, M_PCB, &uicb->hashmask);
 223
 224                 in_pcbportinfo_init(&portinfo[cpu], UDBHASHSIZE, cpu);
 225                 uicb->portinfo = portinfo;
 226                 uicb->portinfo_mask = ncpus2_mask;
 227
 228                 uicb->wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
 229                     &uicb->wildcardhashmask);
 230                 uicb->localgrphashbase = hashinit(UDBHASHSIZE, M_PCB,
 231                     &uicb->localgrphashmask);
 232
 233                 uicb->ipi_size = sizeof(struct inpcb);
 234         }
 235
 236         /*
 237          * Initialize UDP statistics counters for each CPU.
 238          */
 239         for (cpu = 0; cpu < ncpus; ++cpu)
 240                 bzero(&udpstat_percpu[cpu], sizeof(struct udpstat));
 241 }
 242
 243 static int
 244 sysctl_udpstat(SYSCTL_HANDLER_ARGS)
 245 {
 246         int cpu, error = 0;
 247
 248         for (cpu = 0; cpu < ncpus; ++cpu) {
 249                 if ((error = SYSCTL_OUT(req, &udpstat_percpu[cpu],
 250                                         sizeof(struct udpstat))))
 251                         break;
 252                 if ((error = SYSCTL_IN(req, &udpstat_percpu[cpu],
 253                                        sizeof(struct udpstat))))
 254                         break;
 255         }
 256
 257         return (error);
 258 }
 259 SYSCTL_PROC(_net_inet_udp, UDPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
 260     0, 0, sysctl_udpstat, "S,udpstat", "UDP statistics");
 261
 262 void
 263 udp_ctloutput(netmsg_t msg)
 264 {
 265         struct socket *so = msg->base.nm_so;
 266         struct sockopt *sopt = msg->ctloutput.nm_sopt;
 267         struct inpcb *inp = so->so_pcb;
 268
 269         if (inp == NULL) {
 270                 lwkt_replymsg(&msg->lmsg, EINVAL);
 271                 return;
 272         }
 273
 274         if (sopt->sopt_level == IPPROTO_IP && sopt->sopt_dir == SOPT_SET) {
 275                 switch (sopt->sopt_name) {
 276                 case IP_MULTICAST_IF:
 277                 case IP_MULTICAST_VIF:
 278                 case IP_MULTICAST_TTL:
 279                 case IP_MULTICAST_LOOP:
 280                 case IP_ADD_MEMBERSHIP:
 281                 case IP_DROP_MEMBERSHIP:
 282                         /*
 283                          * This pr_ctloutput msg will be forwarded
 284                          * to netisr0 to run; we can't do direct
 285                          * detaching anymore.
 286                          *
 287                          * NOTE:
 288                          * Don't optimize for the sockets whose
 289                          * current so_port is netisr0's msgport.
 290                          * These sockets could be connect(2)'ed
 291                          * later and the so_port will be changed.
 292                          */
 293                         inp->inp_flags &= ~INP_DIRECT_DETACH;
 294                         break;
 295                 }
 296         }
 297         return ip_ctloutput(msg);
 298 }
 299
 300 /*
 301  * Check multicast packets to make sure they are only sent to sockets with
 302  * multicast memberships for the packet's destination address and arrival
 303  * interface.  Multicast packets to multicast-unaware sockets are also
 304  * disallowed.
 305  *
 306  * Returns 0 if the packet is acceptable, -1 if it is not.
 307  */
 308 static __inline int
 309 check_multicast_membership(const struct ip *ip, const struct inpcb *inp,
 310     const struct mbuf *m)
 311 {
 312         const struct ip_moptions *mopt;
 313         int mshipno;
 314
 315         if (strict_mcast_mship == 0 ||
 316             !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 317                 return (0);
 318         }
 319
 320         ASSERT_IN_NETISR(0);
 321
 322         mopt = inp->inp_moptions;
 323         if (mopt == NULL)
 324                 return (-1);
 325         for (mshipno = 0; mshipno < mopt->imo_num_memberships; ++mshipno) {
 326                 const struct in_multi *maddr = mopt->imo_membership[mshipno];
 327
 328                 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
 329                     m->m_pkthdr.rcvif == maddr->inm_ifp) {
 330                         return (0);
 331                 }
 332         }
 333         return (-1);
 334 }
 335
 336 struct udp_mcast_arg {
 337         struct inpcb    *inp;
 338         struct inpcb    *last;
 339         struct ip       *ip;
 340         struct mbuf     *m;
 341         int             iphlen;
 342         struct sockaddr_in *udp_in;
 343 };
 344
 345 static int
 346 udp_mcast_input(struct udp_mcast_arg *arg)
 347 {
 348         struct inpcb *inp = arg->inp;
 349         struct inpcb *last = arg->last;
 350         struct ip *ip = arg->ip;
 351         struct mbuf *m = arg->m;
 352
 353         if (check_multicast_membership(ip, inp, m) < 0)
 354                 return ERESTART; /* caller continue */
 355
 356         if (last != NULL) {
 357                 struct mbuf *n;
 358
 359 #ifdef IPSEC
 360                 /* check AH/ESP integrity. */
 361                 if (ipsec4_in_reject_so(m, last->inp_socket))
 362                         ipsecstat.in_polvio++;
 363                         /* do not inject data to pcb */
 364                 else
 365 #endif /*IPSEC*/
 366 #ifdef FAST_IPSEC
 367                 /* check AH/ESP integrity. */
 368                 if (ipsec4_in_reject(m, last))
 369                         ;
 370                 else
 371 #endif /*FAST_IPSEC*/
 372                 if ((n = m_copypacket(m, M_NOWAIT)) != NULL)
 373                         udp_append(last, ip, n,
 374                             arg->iphlen + sizeof(struct udphdr),
 375                             arg->udp_in);
 376         }
 377         arg->last = last = inp;
 378
 379         /*
 380          * Don't look for additional matches if this one does
 381          * not have either the SO_REUSEPORT or SO_REUSEADDR
 382          * socket options set.  This heuristic avoids searching
 383          * through all pcbs in the common case of a non-shared
 384          * port.  It * assumes that an application will never
 385          * clear these options after setting them.
 386          */
 387         if (!(last->inp_socket->so_options &
 388             (SO_REUSEPORT | SO_REUSEADDR)))
 389                 return EJUSTRETURN; /* caller stop */
 390         return 0;
 391 }
 392
 393 int
 394 udp_input(struct mbuf **mp, int *offp, int proto)
 395 {
 396         struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
 397         int iphlen;
 398         struct ip *ip;
 399         struct udphdr *uh;
 400         struct inpcb *inp;
 401         struct mbuf *m;
 402         struct mbuf *opts = NULL;
 403         int len, off;
 404         struct ip save_ip;
 405         struct inpcbinfo *pcbinfo = &udbinfo[mycpuid];
 406
 407         off = *offp;
 408         m = *mp;
 409         *mp = NULL;
 410
 411         iphlen = off;
 412         udp_stat.udps_ipackets++;
 413
 414         /*
 415          * Strip IP options, if any; should skip this,
 416          * make available to user, and use on returned packets,
 417          * but we don't yet have a way to check the checksum
 418          * with options still present.
 419          */
 420         if (iphlen > sizeof(struct ip)) {
 421                 ip_stripoptions(m);
 422                 iphlen = sizeof(struct ip);
 423         }
 424
 425         /*
 426          * IP and UDP headers are together in first mbuf.
 427          * Already checked and pulled up in ip_demux().
 428          */
 429         KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
 430             ("UDP header not in one mbuf"));
 431
 432         ip = mtod(m, struct ip *);
 433         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 434
 435         /* destination port of 0 is illegal, based on RFC768. */
 436         if (uh->uh_dport == 0)
 437                 goto bad;
 438
 439         /*
 440          * Make mbuf data length reflect UDP length.
 441          * If not enough data to reflect UDP length, drop.
 442          */
 443         len = ntohs((u_short)uh->uh_ulen);
 444         if (ip->ip_len != len) {
 445                 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
 446                         udp_stat.udps_badlen++;
 447                         goto bad;
 448                 }
 449                 m_adj(m, len - ip->ip_len);
 450                 /* ip->ip_len = len; */
 451         }
 452         /*
 453          * Save a copy of the IP header in case we want restore it
 454          * for sending an ICMP error message in response.
 455          */
 456         save_ip = *ip;
 457
 458         /*
 459          * Checksum extended UDP header and data.
 460          */
 461         if (uh->uh_sum) {
 462                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
 463                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 464                                 uh->uh_sum = m->m_pkthdr.csum_data;
 465                         else
 466                                 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
 467                                     ip->ip_dst.s_addr, htonl((u_short)len +
 468                                     m->m_pkthdr.csum_data + IPPROTO_UDP));
 469                         uh->uh_sum ^= 0xffff;
 470                 } else {
 471                         char b[9];
 472
 473                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 474                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 475                         ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
 476                         uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
 477                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 478                 }
 479                 if (uh->uh_sum) {
 480                         udp_stat.udps_badsum++;
 481                         m_freem(m);
 482                         return(IPPROTO_DONE);
 483                 }
 484         } else
 485                 udp_stat.udps_nosum++;
 486
 487         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 488             in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
 489                 struct inpcbhead *connhead;
 490                 struct inpcontainer *ic, *ic_marker;
 491                 struct inpcontainerhead *ichead;
 492                 struct udp_mcast_arg arg;
 493                 struct inpcb *last;
 494                 int error;
 495
 496                 /*
 497                  * Deliver a multicast or broadcast datagram to *all* sockets
 498                  * for which the local and remote addresses and ports match
 499                  * those of the incoming datagram.  This allows more than
 500                  * one process to receive multi/broadcasts on the same port.
 501                  * (This really ought to be done for unicast datagrams as
 502                  * well, but that would cause problems with existing
 503                  * applications that open both address-specific sockets and
 504                  * a wildcard socket listening to the same port -- they would
 505                  * end up receiving duplicates of every unicast datagram.
 506                  * Those applications open the multiple sockets to overcome an
 507                  * inadequacy of the UDP socket interface, but for backwards
 508                  * compatibility we avoid the problem here rather than
 509                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 510                  */
 511
 512                 /*
 513                  * Construct sockaddr format source address.
 514                  */
 515                 udp_in.sin_port = uh->uh_sport;
 516                 udp_in.sin_addr = ip->ip_src;
 517                 arg.udp_in = &udp_in;
 518                 /*
 519                  * Locate pcb(s) for datagram.
 520                  * (Algorithm copied from raw_intr().)
 521                  */
 522                 last = NULL;
 523                 arg.iphlen = iphlen;
 524
 525                 connhead = &pcbinfo->hashbase[
 526                     INP_PCBCONNHASH(ip->ip_src.s_addr, uh->uh_sport,
 527                     ip->ip_dst.s_addr, uh->uh_dport, pcbinfo->hashmask)];
 528                 LIST_FOREACH(inp, connhead, inp_hash) {
 529 #ifdef INET6
 530                         if (!INP_ISIPV4(inp))
 531                                 continue;
 532 #endif
 533                         if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
 534                             !in_hosteq(inp->inp_laddr, ip->ip_dst) ||
 535                             inp->inp_fport != uh->uh_sport ||
 536                             inp->inp_lport != uh->uh_dport)
 537                                 continue;
 538
 539                         arg.inp = inp;
 540                         arg.last = last;
 541                         arg.ip = ip;
 542                         arg.m = m;
 543
 544                         error = udp_mcast_input(&arg);
 545                         if (error == ERESTART)
 546                                 continue;
 547                         last = arg.last;
 548
 549                         if (error == EJUSTRETURN)
 550                                 goto done;
 551                 }
 552
 553                 ichead = &pcbinfo->wildcardhashbase[
 554                     INP_PCBWILDCARDHASH(uh->uh_dport,
 555                     pcbinfo->wildcardhashmask)];
 556                 ic_marker = in_pcbcontainer_marker(mycpuid);
 557
 558                 GET_PCBINFO_TOKEN(pcbinfo);
 559                 LIST_INSERT_HEAD(ichead, ic_marker, ic_list);
 560                 while ((ic = LIST_NEXT(ic_marker, ic_list)) != NULL) {
 561                         LIST_REMOVE(ic_marker, ic_list);
 562                         LIST_INSERT_AFTER(ic, ic_marker, ic_list);
 563
 564                         inp = ic->ic_inp;
 565                         if (inp->inp_flags & INP_PLACEMARKER)
 566                                 continue;
 567 #ifdef INET6
 568                         if (!INP_ISIPV4(inp))
 569                                 continue;
 570 #endif
 571                         if (inp->inp_lport != uh->uh_dport)
 572                                 continue;
 573                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 574                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 575                                 continue;
 576
 577                         arg.inp = inp;
 578                         arg.last = last;
 579                         arg.ip = ip;
 580                         arg.m = m;
 581
 582                         error = udp_mcast_input(&arg);
 583                         if (error == ERESTART)
 584                                 continue;
 585                         last = arg.last;
 586
 587                         if (error == EJUSTRETURN)
 588                                 break;
 589                 }
 590                 LIST_REMOVE(ic_marker, ic_list);
 591                 REL_PCBINFO_TOKEN(pcbinfo);
 592 done:
 593                 if (last == NULL) {
 594                         /*
 595                          * No matching pcb found; discard datagram.
 596                          * (No need to send an ICMP Port Unreachable
 597                          * for a broadcast or multicast datgram.)
 598                          */
 599                         udp_stat.udps_noportbcast++;
 600                         goto bad;
 601                 }
 602 #ifdef IPSEC
 603                 /* check AH/ESP integrity. */
 604                 if (ipsec4_in_reject_so(m, last->inp_socket)) {
 605                         ipsecstat.in_polvio++;
 606                         goto bad;
 607                 }
 608 #endif /*IPSEC*/
 609 #ifdef FAST_IPSEC
 610                 /* check AH/ESP integrity. */
 611                 if (ipsec4_in_reject(m, last))
 612                         goto bad;
 613 #endif /*FAST_IPSEC*/
 614                 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
 615                     &udp_in);
 616                 return(IPPROTO_DONE);
 617         }
 618         /*
 619          * Locate pcb for datagram.
 620          */
 621         inp = in_pcblookup_pkthash(pcbinfo, ip->ip_src, uh->uh_sport,
 622             ip->ip_dst, uh->uh_dport, TRUE, m->m_pkthdr.rcvif,
 623             udp_reuseport_ext ? m : NULL);
 624         if (inp == NULL) {
 625                 if (log_in_vain) {
 626                         char buf[sizeof "aaa.bbb.ccc.ddd"];
 627
 628                         strcpy(buf, inet_ntoa(ip->ip_dst));
 629                         log(LOG_INFO,
 630                             "Connection attempt to UDP %s:%d from %s:%d\n",
 631                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 632                             ntohs(uh->uh_sport));
 633                 }
 634                 udp_stat.udps_noport++;
 635                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 636                         udp_stat.udps_noportbcast++;
 637                         goto bad;
 638                 }
 639                 if (blackhole)
 640                         goto bad;
 641 #ifdef ICMP_BANDLIM
 642                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 643                         goto bad;
 644 #endif
 645                 *ip = save_ip;
 646                 ip->ip_len += iphlen;
 647                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 648                 return(IPPROTO_DONE);
 649         }
 650         KASSERT(INP_ISIPV4(inp), ("not inet inpcb"));
 651 #ifdef IPSEC
 652         if (ipsec4_in_reject_so(m, inp->inp_socket)) {
 653                 ipsecstat.in_polvio++;
 654                 goto bad;
 655         }
 656 #endif /*IPSEC*/
 657 #ifdef FAST_IPSEC
 658         if (ipsec4_in_reject(m, inp))
 659                 goto bad;
 660 #endif /*FAST_IPSEC*/
 661         /*
 662          * Check the minimum TTL for socket.
 663          */
 664         if (ip->ip_ttl < inp->inp_ip_minttl)
 665                 goto bad;
 666
 667         /*
 668          * Construct sockaddr format source address.
 669          * Stuff source address and datagram in user buffer.
 670          */
 671         udp_in.sin_port = uh->uh_sport;
 672         udp_in.sin_addr = ip->ip_src;
 673         if ((inp->inp_flags & INP_CONTROLOPTS) ||
 674             (inp->inp_socket->so_options & SO_TIMESTAMP))
 675                 ip_savecontrol(inp, &opts, ip, m);
 676         m_adj(m, iphlen + sizeof(struct udphdr));
 677
 678         lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
 679         if (ssb_appendaddr(&inp->inp_socket->so_rcv,
 680             (struct sockaddr *)&udp_in, m, opts) == 0) {
 681                 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 682                 udp_stat.udps_fullsock++;
 683                 goto bad;
 684         }
 685         lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 686         sorwakeup(inp->inp_socket);
 687         return(IPPROTO_DONE);
 688 bad:
 689         m_freem(m);
 690         if (opts)
 691                 m_freem(opts);
 692         return(IPPROTO_DONE);
 693 }
 694
 695 /*
 696  * subroutine of udp_input(), mainly for source code readability.
 697  * caller must properly init udp_ip6 and udp_in6 beforehand.
 698  */
 699 static void
 700 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off,
 701     struct sockaddr_in *udp_in)
 702 {
 703         struct mbuf *opts = NULL;
 704         int ret;
 705
 706         KASSERT(INP_ISIPV4(last), ("not inet inpcb"));
 707
 708         if (last->inp_flags & INP_CONTROLOPTS ||
 709             last->inp_socket->so_options & SO_TIMESTAMP)
 710                 ip_savecontrol(last, &opts, ip, n);
 711         m_adj(n, off);
 712
 713         lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
 714         ret = ssb_appendaddr(&last->inp_socket->so_rcv,
 715             (struct sockaddr *)udp_in, n, opts);
 716         lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
 717         if (ret == 0) {
 718                 m_freem(n);
 719                 if (opts)
 720                         m_freem(opts);
 721                 udp_stat.udps_fullsock++;
 722         } else {
 723                 sorwakeup(last->inp_socket);
 724         }
 725 }
 726
 727 /*
 728  * Notify a udp user of an asynchronous error;
 729  * just wake up so that he can collect error status.
 730  */
 731 void
 732 udp_notify(struct inpcb *inp, int error)
 733 {
 734         inp->inp_socket->so_error = error;
 735         sorwakeup(inp->inp_socket);
 736         sowwakeup(inp->inp_socket);
 737 }
 738
 739 struct netmsg_udp_notify {
 740         struct netmsg_base base;
 741         inp_notify_t    nm_notify;
 742         struct in_addr  nm_faddr;
 743         int             nm_arg;
 744 };
 745
 746 static void
 747 udp_notifyall_oncpu(netmsg_t msg)
 748 {
 749         struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
 750         int nextcpu, cpu = mycpuid;
 751
 752         in_pcbnotifyall(&udbinfo[cpu], nm->nm_faddr, nm->nm_arg, nm->nm_notify);
 753
 754         nextcpu = cpu + 1;
 755         if (nextcpu < ncpus2)
 756                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 757         else
 758                 lwkt_replymsg(&nm->base.lmsg, 0);
 759 }
 760
 761 inp_notify_t
 762 udp_get_inpnotify(int cmd, const struct sockaddr *sa,
 763     struct ip **ip0, int *cpuid)
 764 {
 765         struct in_addr faddr;
 766         struct ip *ip = *ip0;
 767         inp_notify_t notify = udp_notify;
 768
 769         faddr = ((const struct sockaddr_in *)sa)->sin_addr;
 770         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 771                 return NULL;
 772
 773         if (PRC_IS_REDIRECT(cmd)) {
 774                 ip = NULL;
 775                 notify = in_rtchange;
 776         } else if (cmd == PRC_HOSTDEAD) {
 777                 ip = NULL;
 778         } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
 779                 return NULL;
 780         }
 781
 782         if (cpuid != NULL) {
 783                 if (ip == NULL) {
 784                         /* Go through all CPUs */
 785                         *cpuid = ncpus;
 786                 } else {
 787                         const struct udphdr *uh;
 788
 789                         uh = (const struct udphdr *)
 790                             ((caddr_t)ip + (ip->ip_hl << 2));
 791                         *cpuid = udp_addrcpu(faddr.s_addr, uh->uh_dport,
 792                             ip->ip_src.s_addr, uh->uh_sport);
 793                 }
 794         }
 795
 796         *ip0 = ip;
 797         return notify;
 798 }
 799
 800 void
 801 udp_ctlinput(netmsg_t msg)
 802 {
 803         struct sockaddr *sa = msg->ctlinput.nm_arg;
 804         struct ip *ip = msg->ctlinput.nm_extra;
 805         int cmd = msg->ctlinput.nm_cmd, cpuid;
 806         inp_notify_t notify;
 807         struct in_addr faddr;
 808
 809         notify = udp_get_inpnotify(cmd, sa, &ip, &cpuid);
 810         if (notify == NULL)
 811                 goto done;
 812
 813         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 814         if (ip) {
 815                 const struct udphdr *uh;
 816                 struct inpcb *inp;
 817
 818                 if (cpuid != mycpuid)
 819                         goto done;
 820
 821                 uh = (const struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 822                 inp = in_pcblookup_hash(&udbinfo[mycpuid], faddr, uh->uh_dport,
 823                                         ip->ip_src, uh->uh_sport, 0, NULL);
 824                 if (inp != NULL && inp->inp_socket != NULL)
 825                         notify(inp, inetctlerrmap[cmd]);
 826         } else if (msg->ctlinput.nm_direct) {
 827                 if (cpuid != ncpus && cpuid != mycpuid)
 828                         goto done;
 829                 if (mycpuid >= ncpus2)
 830                         goto done;
 831
 832                 in_pcbnotifyall(&udbinfo[mycpuid], faddr, inetctlerrmap[cmd],
 833                     notify);
 834         } else {
 835                 struct netmsg_udp_notify *nm;
 836
 837                 ASSERT_IN_NETISR(0);
 838                 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
 839                 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
 840                             0, udp_notifyall_oncpu);
 841                 nm->nm_faddr = faddr;
 842                 nm->nm_arg = inetctlerrmap[cmd];
 843                 nm->nm_notify = notify;
 844                 lwkt_sendmsg(netisr_cpuport(0), &nm->base.lmsg);
 845         }
 846 done:
 847         lwkt_replymsg(&msg->lmsg, 0);
 848 }
 849
 850 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, udbinfo, 0,
 851             in_pcblist_global_ncpus2, "S,xinpcb", "List of active UDP sockets");
 852
 853 static int
 854 udp_getcred(SYSCTL_HANDLER_ARGS)
 855 {
 856         struct sockaddr_in addrs[2];
 857         struct ucred cred0, *cred = NULL;
 858         struct inpcb *inp;
 859         int error, cpu, origcpu;
 860
 861         error = priv_check(req->td, PRIV_ROOT);
 862         if (error)
 863                 return (error);
 864         error = SYSCTL_IN(req, addrs, sizeof addrs);
 865         if (error)
 866                 return (error);
 867
 868         origcpu = mycpuid;
 869         cpu = udp_addrcpu(addrs[1].sin_addr.s_addr, addrs[1].sin_port,
 870             addrs[0].sin_addr.s_addr, addrs[0].sin_port);
 871
 872         lwkt_migratecpu(cpu);
 873
 874         inp = in_pcblookup_hash(&udbinfo[cpu],
 875             addrs[1].sin_addr, addrs[1].sin_port,
 876             addrs[0].sin_addr, addrs[0].sin_port, TRUE, NULL);
 877         if (inp == NULL || inp->inp_socket == NULL) {
 878                 error = ENOENT;
 879         } else if (inp->inp_socket->so_cred != NULL) {
 880                 cred0 = *(inp->inp_socket->so_cred);
 881                 cred = &cred0;
 882         }
 883
 884         lwkt_migratecpu(origcpu);
 885
 886         if (error)
 887                 return error;
 888
 889         return SYSCTL_OUT(req, cred, sizeof(struct ucred));
 890 }
 891 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 892     0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
 893
 894 static void
 895 udp_send_redispatch(netmsg_t msg)
 896 {
 897         struct mbuf *m = msg->send.nm_m;
 898         int pru_flags = msg->send.nm_flags;
 899         struct inpcb *inp = msg->send.base.nm_so->so_pcb;
 900         struct mbuf *m_opt = msg->send.nm_control; /* XXX save ipopt */
 901         int flags = msg->send.nm_priv; /* ip_output flags */
 902         int error;
 903
 904         logudp(redisp_ipout_beg, inp);
 905
 906         /*
 907          * - Don't use inp route cache.  It should only be used in the
 908          *   inp owner netisr.
 909          * - Access to inp_moptions should be safe, since multicast UDP
 910          *   datagrams are redispatched to netisr0 and inp_moptions is
 911          *   changed only in netisr0.
 912          */
 913         error = ip_output(m, m_opt, NULL, flags, inp->inp_moptions, inp);
 914         if ((pru_flags & PRUS_NOREPLY) == 0)
 915                 lwkt_replymsg(&msg->send.base.lmsg, error);
 916
 917         if (m_opt != NULL) {
 918                 /* Free saved ip options, if any */
 919                 m_freem(m_opt);
 920         }
 921
 922         logudp(redisp_ipout_end, inp);
 923 }
 924
 925 static void
 926 udp_send(netmsg_t msg)
 927 {
 928         struct socket *so = msg->send.base.nm_so;
 929         struct mbuf *m = msg->send.nm_m;
 930         struct sockaddr *dstaddr = msg->send.nm_addr;
 931         int pru_flags = msg->send.nm_flags;
 932         struct inpcb *inp = so->so_pcb;
 933         struct thread *td = msg->send.nm_td;
 934         int flags;
 935
 936         struct udpiphdr *ui;
 937         int len = m->m_pkthdr.len;
 938         struct sockaddr_in *sin;        /* really is initialized before use */
 939         int error = 0, cpu;
 940
 941         KKASSERT(msg->send.nm_control == NULL);
 942
 943         logudp(send_beg, inp);
 944
 945         if (inp == NULL) {
 946                 error = EINVAL;
 947                 goto release;
 948         }
 949
 950         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
 951                 error = EMSGSIZE;
 952                 goto release;
 953         }
 954
 955         if (inp->inp_lport == 0) {      /* unbound socket */
 956                 boolean_t forwarded;
 957
 958                 error = in_pcbbind(inp, NULL, td);
 959                 if (error)
 960                         goto release;
 961
 962                 /*
 963                  * Need to call udp_send again, after this inpcb is
 964                  * inserted into wildcard hash table.
 965                  */
 966                 msg->send.base.lmsg.ms_flags |= MSGF_UDP_SEND;
 967                 forwarded = udp_inswildcardhash(inp, &msg->send.base, 0);
 968                 if (forwarded) {
 969                         /*
 970                          * The message is further forwarded, so we are
 971                          * done here.
 972                          */
 973                         logudp(send_inswildcard, inp);
 974                         return;
 975                 }
 976         }
 977
 978         if (dstaddr != NULL) {          /* destination address specified */
 979                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
 980                         /* already connected */
 981                         error = EISCONN;
 982                         goto release;
 983                 }
 984                 sin = (struct sockaddr_in *)dstaddr;
 985                 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
 986                         error = EAFNOSUPPORT; /* IPv6 only jail */
 987                         goto release;
 988                 }
 989         } else {
 990                 if (inp->inp_faddr.s_addr == INADDR_ANY) {
 991                         /* no destination specified and not already connected */
 992                         error = ENOTCONN;
 993                         goto release;
 994                 }
 995                 sin = NULL;
 996         }
 997
 998         /*
 999          * Calculate data length and get a mbuf
1000          * for UDP and IP headers.
1001          */
1002         M_PREPEND(m, sizeof(struct udpiphdr), M_NOWAIT);
1003         if (m == NULL) {
1004                 error = ENOBUFS;
1005                 goto release;
1006         }
1007
1008         /*
1009          * Fill in mbuf with extended UDP header
1010          * and addresses and length put into network format.
1011          */
1012         ui = mtod(m, struct udpiphdr *);
1013         bzero(ui->ui_x1, sizeof ui->ui_x1);     /* XXX still needed? */
1014         ui->ui_pr = IPPROTO_UDP;
1015
1016         /*
1017          * Set destination address.
1018          */
1019         if (dstaddr != NULL) {                  /* use specified destination */
1020                 ui->ui_dst = sin->sin_addr;
1021                 ui->ui_dport = sin->sin_port;
1022         } else {                                /* use connected destination */
1023                 ui->ui_dst = inp->inp_faddr;
1024                 ui->ui_dport = inp->inp_fport;
1025         }
1026
1027         /*
1028          * Set source address.
1029          */
1030         if (inp->inp_laddr.s_addr == INADDR_ANY ||
1031             IN_MULTICAST(ntohl(inp->inp_laddr.s_addr))) {
1032                 struct sockaddr_in *if_sin;
1033
1034                 if (dstaddr == NULL) {
1035                         /*
1036                          * connect() had (or should have) failed because
1037                          * the interface had no IP address, but the
1038                          * application proceeded to call send() anyways.
1039                          */
1040                         error = ENOTCONN;
1041                         goto release;
1042                 }
1043
1044                 /* Look up outgoing interface. */
1045                 error = in_pcbladdr_find(inp, dstaddr, &if_sin, td, 1);
1046                 if (error)
1047                         goto release;
1048                 ui->ui_src = if_sin->sin_addr;  /* use address of interface */
1049         } else {
1050                 ui->ui_src = inp->inp_laddr;    /* use non-null bound address */
1051         }
1052         ui->ui_sport = inp->inp_lport;
1053         KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
1054
1055         /*
1056          * Release the original thread, since it is no longer used
1057          */
1058         if (pru_flags & PRUS_HELDTD) {
1059                 lwkt_rele(td);
1060                 pru_flags &= ~PRUS_HELDTD;
1061         }
1062         /*
1063          * Free the dest address, since it is no longer needed
1064          */
1065         if (pru_flags & PRUS_FREEADDR) {
1066                 kfree(dstaddr, M_SONAME);
1067                 pru_flags &= ~PRUS_FREEADDR;
1068         }
1069
1070         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1071
1072         /*
1073          * Set up checksum and output datagram.
1074          */
1075         if (udpcksum) {
1076                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
1077                     htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
1078                 m->m_pkthdr.csum_flags = CSUM_UDP;
1079                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1080                 m->m_pkthdr.csum_thlen = sizeof(struct udphdr);
1081         } else {
1082                 ui->ui_sum = 0;
1083         }
1084         ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
1085         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1086         ((struct ip *)ui)->ip_tos = inp->inp_ip_tos;    /* XXX */
1087         udp_stat.udps_opackets++;
1088
1089         flags = IP_DEBUGROUTE |
1090             (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
1091         if (pru_flags & PRUS_DONTROUTE)
1092                 flags |= SO_DONTROUTE;
1093
1094         if (inp->inp_flags & INP_CONNECTED) {
1095                 /*
1096                  * For connected socket, this datagram has already
1097                  * been in the correct netisr; no need to rehash.
1098                  */
1099                 goto sendit;
1100         }
1101
1102         cpu = udp_addrcpu(ui->ui_dst.s_addr, ui->ui_dport,
1103             ui->ui_src.s_addr, ui->ui_sport);
1104         if (cpu != mycpuid) {
1105                 struct mbuf *m_opt = NULL;
1106                 struct netmsg_pru_send *smsg;
1107                 struct lwkt_port *port = netisr_cpuport(cpu);
1108
1109                 /*
1110                  * Not on the CPU that matches this UDP datagram hash;
1111                  * redispatch to the correct CPU to do the ip_output().
1112                  */
1113                 if (inp->inp_options != NULL) {
1114                         /*
1115                          * If there are ip options, then save a copy,
1116                          * since accessing inp_options on other CPUs'
1117                          * is not safe.
1118                          *
1119                          * XXX optimize this?
1120                          */
1121                         m_opt = m_copym(inp->inp_options, 0, M_COPYALL,
1122                             M_WAITOK);
1123                 }
1124                 if ((pru_flags & PRUS_NOREPLY) == 0) {
1125                         /*
1126                          * Change some parts of the original netmsg and
1127                          * forward it to the target netisr.
1128                          *
1129                          * NOTE: so_port MUST NOT be checked in the target
1130                          * netisr.
1131                          */
1132                         smsg = &msg->send;
1133                         smsg->nm_priv = flags; /* ip_output flags */
1134                         smsg->nm_m = m;
1135                         smsg->nm_control = m_opt; /* XXX save ipopt */
1136                         smsg->base.lmsg.ms_flags |= MSGF_IGNSOPORT;
1137                         smsg->base.nm_dispatch = udp_send_redispatch;
1138                         lwkt_forwardmsg(port, &smsg->base.lmsg);
1139                 } else {
1140                         /*
1141                          * Recreate the netmsg, since the original mbuf
1142                          * could have been changed.  And send it to the
1143                          * target netisr.
1144                          *
1145                          * NOTE: so_port MUST NOT be checked in the target
1146                          * netisr.
1147                          */
1148                         smsg = &m->m_hdr.mh_sndmsg;
1149                         netmsg_init(&smsg->base, so, &netisr_apanic_rport,
1150                             MSGF_IGNSOPORT, udp_send_redispatch);
1151                         smsg->nm_priv = flags; /* ip_output flags */
1152                         smsg->nm_flags = pru_flags;
1153                         smsg->nm_m = m;
1154                         smsg->nm_control = m_opt; /* XXX save ipopt */
1155                         lwkt_sendmsg(port, &smsg->base.lmsg);
1156                 }
1157
1158                 /* This UDP datagram is redispatched; done */
1159                 logudp(send_redisp, inp);
1160                 return;
1161         }
1162
1163 sendit:
1164         logudp(send_ipout, inp);
1165         error = ip_output(m, inp->inp_options, &inp->inp_route, flags,
1166             inp->inp_moptions, inp);
1167         m = NULL;
1168
1169 release:
1170         if (m != NULL)
1171                 m_freem(m);
1172
1173         if (pru_flags & PRUS_HELDTD)
1174                 lwkt_rele(td);
1175         if (pru_flags & PRUS_FREEADDR)
1176                 kfree(dstaddr, M_SONAME);
1177         if ((pru_flags & PRUS_NOREPLY) == 0)
1178                 lwkt_replymsg(&msg->send.base.lmsg, error);
1179
1180         logudp(send_end, inp);
1181 }
1182
1183 u_long  udp_sendspace = 9216;           /* really max datagram size */
1184                                         /* 40 1K datagrams */
1185 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
1186     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
1187
1188 u_long  udp_recvspace = 40 * (1024 +
1189 #ifdef INET6
1190                                       sizeof(struct sockaddr_in6)
1191 #else
1192                                       sizeof(struct sockaddr_in)
1193 #endif
1194                                       );
1195 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1196     &udp_recvspace, 0, "Maximum incoming UDP datagram size");
1197
1198 /*
1199  * This should never happen, since UDP socket does not support
1200  * connection acception (SO_ACCEPTCONN, i.e. listen(2)).
1201  */
1202 static void
1203 udp_abort(netmsg_t msg __unused)
1204 {
1205         panic("udp_abort is called");
1206 }
1207
1208 static int
1209 udp_preattach(struct socket *so, int proto __unused, struct pru_attach_info *ai)
1210 {
1211         return soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1212 }
1213
1214 static void
1215 udp_attach(netmsg_t msg)
1216 {
1217         struct socket *so = msg->attach.base.nm_so;
1218         struct pru_attach_info *ai = msg->attach.nm_ai;
1219         struct inpcb *inp;
1220         int error;
1221
1222         KASSERT(so->so_pcb == NULL, ("udp socket attached"));
1223
1224         if (ai != NULL) {
1225                 error = udp_preattach(so, 0 /* don't care */, ai);
1226                 if (error)
1227                         goto out;
1228         } else {
1229                 /* Post attach; do nothing */
1230         }
1231
1232         error = in_pcballoc(so, &udbinfo[mycpuid]);
1233         if (error)
1234                 goto out;
1235
1236         inp = so->so_pcb;
1237         inp->inp_flags |= INP_DIRECT_DETACH;
1238         inp->inp_ip_ttl = ip_defttl;
1239         error = 0;
1240 out:
1241         lwkt_replymsg(&msg->attach.base.lmsg, error);
1242 }
1243
1244 static void
1245 udp_inswildcard_replymsg(netmsg_t msg)
1246 {
1247         lwkt_msg_t lmsg = &msg->lmsg;
1248
1249         if (lmsg->ms_flags & MSGF_UDP_SEND) {
1250                 udp_send(msg);
1251                 /* msg is replied by udp_send() */
1252         } else {
1253                 lwkt_replymsg(lmsg, lmsg->ms_error);
1254         }
1255 }
1256
1257 static void
1258 udp_soreuseport_dispatch(netmsg_t msg)
1259 {
1260         /* This inpcb has already been in the wildcard hash. */
1261         in_pcblink_flags(msg->base.nm_so->so_pcb, &udbinfo[mycpuid], 0);
1262         udp_inswildcard_replymsg(msg);
1263 }
1264
1265 static void
1266 udp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
1267 {
1268         sosetport(((struct netmsg_base *)msg)->nm_so, port);
1269 }
1270
1271 static boolean_t
1272 udp_inswildcardhash_oncpu(struct inpcb *inp, struct netmsg_base *msg)
1273 {
1274         int cpu;
1275
1276         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1277             ("not on owner cpu"));
1278
1279         in_pcbinswildcardhash(inp);
1280         for (cpu = 0; cpu < ncpus2; ++cpu) {
1281                 if (cpu == mycpuid) {
1282                         /*
1283                          * This inpcb has been inserted by the above
1284                          * in_pcbinswildcardhash().
1285                          */
1286                         continue;
1287                 }
1288                 in_pcbinswildcardhash_oncpu(inp, &udbinfo[cpu]);
1289         }
1290
1291         if (inp->inp_socket->so_options & SO_REUSEPORT) {
1292                 /*
1293                  * For SO_REUSEPORT socket, redistribute it based on its
1294                  * local group index.
1295                  */
1296                 cpu = inp->inp_lgrpindex & ncpus2_mask;
1297                 if (cpu != mycpuid) {
1298                         struct lwkt_port *port = netisr_cpuport(cpu);
1299                         lwkt_msg_t lmsg = &msg->lmsg;
1300
1301                         /*
1302                          * We are moving the protocol processing port the
1303                          * socket is on, we have to unlink here and re-link
1304                          * on the target cpu (this inpcb is still left in
1305                          * the wildcard hash).
1306                          */
1307                         in_pcbunlink_flags(inp, &udbinfo[mycpuid], 0);
1308                         msg->nm_dispatch = udp_soreuseport_dispatch;
1309
1310                         /*
1311                          * See the related comment in tcp_usrreq.c
1312                          * tcp_connect()
1313                          */
1314                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1315                         lwkt_forwardmsg(port, lmsg);
1316                         return TRUE; /* forwarded */
1317                 }
1318         }
1319         return FALSE;
1320 }
1321
1322 static void
1323 udp_inswildcardhash_dispatch(netmsg_t msg)
1324 {
1325         struct inpcb *inp = msg->base.nm_so->so_pcb;
1326         boolean_t forwarded;
1327
1328         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1329         KASSERT(udp_lportcpu(inp->inp_lport) == mycpuid, ("not target cpu"));
1330
1331         in_pcblink(inp, &udbinfo[mycpuid]);
1332
1333         forwarded = udp_inswildcardhash_oncpu(inp, &msg->base);
1334         if (forwarded) {
1335                 /* The message is further forwarded, so we are done here. */
1336                 return;
1337         }
1338         udp_inswildcard_replymsg(msg);
1339 }
1340
1341 static boolean_t
1342 udp_inswildcardhash(struct inpcb *inp, struct netmsg_base *msg, int error)
1343 {
1344         lwkt_msg_t lmsg = &msg->lmsg;
1345         int cpu;
1346
1347         ASSERT_INP_NOTINHASH(inp);
1348
1349         /* This inpcb could no longer be directly detached */
1350         inp->inp_flags &= ~INP_DIRECT_DETACH;
1351
1352         /*
1353          * Always clear the route cache, so we don't need to
1354          * worry about any owner CPU changes later.
1355          */
1356         in_pcbresetroute(inp);
1357
1358         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1359         cpu = udp_lportcpu(inp->inp_lport);
1360
1361         lmsg->ms_error = error;
1362         if (cpu != mycpuid) {
1363                 struct lwkt_port *port = netisr_cpuport(cpu);
1364
1365                 /*
1366                  * We are moving the protocol processing port the socket
1367                  * is on, we have to unlink here and re-link on the
1368                  * target cpu.
1369                  */
1370                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1371                 msg->nm_dispatch = udp_inswildcardhash_dispatch;
1372
1373                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1374                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1375                 lwkt_forwardmsg(port, lmsg);
1376                 return TRUE; /* forwarded */
1377         }
1378
1379         return udp_inswildcardhash_oncpu(inp, msg);
1380 }
1381
1382 static void
1383 udp_bind(netmsg_t msg)
1384 {
1385         struct socket *so = msg->bind.base.nm_so;
1386         struct inpcb *inp;
1387         int error;
1388
1389         inp = so->so_pcb;
1390         if (inp) {
1391                 struct sockaddr *nam = msg->bind.nm_nam;
1392                 struct thread *td = msg->bind.nm_td;
1393                 struct sockaddr_in *sin;
1394                 lwkt_port_t port;
1395                 int cpu;
1396
1397                 /*
1398                  * Check "already bound" here (in_pcbbind() does the same
1399                  * check though), so we don't forward a connected/bound
1400                  * socket randomly which would panic in the following
1401                  * in_pcbunlink().
1402                  */
1403                 if (inp->inp_lport != 0 ||
1404                     inp->inp_laddr.s_addr != INADDR_ANY) {
1405                         error = EINVAL; /* already bound */
1406                         goto done;
1407                 }
1408
1409                 if (nam->sa_len != sizeof(*sin)) {
1410                         error = EINVAL;
1411                         goto done;
1412                 }
1413                 sin = (struct sockaddr_in *)nam;
1414
1415                 cpu = udp_lportcpu(sin->sin_port);
1416                 port = netisr_cpuport(cpu);
1417
1418                 /*
1419                  * See the related comment in tcp_usrreq.c tcp_usr_bind().
1420                  * The exception is that we use local port based netisr
1421                  * to serialize in_pcbbind().
1422                  */
1423                 if (&curthread->td_msgport != port) {
1424                         lwkt_msg_t lmsg = &msg->bind.base.lmsg;
1425
1426                         KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0,
1427                             ("already asked to relink"));
1428
1429                         in_pcbunlink(so->so_pcb, &udbinfo[mycpuid]);
1430                         msg->bind.nm_flags |= PRUB_RELINK;
1431
1432                         /*
1433                          * See the related comment in tcp_usrreq.c
1434                          * tcp_connect().
1435                          */
1436                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1437                         lwkt_forwardmsg(port, lmsg);
1438                         /* msg invalid now */
1439                         return;
1440                 }
1441                 KASSERT(so->so_port == port, ("so_port is not netisr%d", cpu));
1442
1443                 if (msg->bind.nm_flags & PRUB_RELINK) {
1444                         msg->bind.nm_flags &= ~PRUB_RELINK;
1445                         in_pcblink(so->so_pcb, &udbinfo[mycpuid]);
1446                 }
1447                 KASSERT(inp->inp_pcbinfo == &udbinfo[cpu],
1448                     ("pcbinfo is not udbinfo%d", cpu));
1449
1450                 error = in_pcbbind(inp, nam, td);
1451                 if (error == 0) {
1452                         boolean_t forwarded;
1453
1454                         if (sin->sin_addr.s_addr != INADDR_ANY)
1455                                 inp->inp_flags |= INP_WASBOUND_NOTANY;
1456
1457                         forwarded = udp_inswildcardhash(inp,
1458                             &msg->bind.base, 0);
1459                         if (forwarded) {
1460                                 /*
1461                                  * The message is further forwarded, so
1462                                  * we are done here.
1463                                  */
1464                                 return;
1465                         }
1466                 }
1467         } else {
1468                 error = EINVAL;
1469         }
1470 done:
1471         lwkt_replymsg(&msg->bind.base.lmsg, error);
1472 }
1473
1474 static int
1475 udp_preconnect(struct socket *so, const struct sockaddr *nam __unused,
1476     struct thread *td __unused)
1477 {
1478         sosetstate(so, SS_ISCONNECTED);         /* XXX */
1479         return 0;
1480 }
1481
1482 static void
1483 udp_connect(netmsg_t msg)
1484 {
1485         struct socket *so = msg->connect.base.nm_so;
1486         struct sockaddr *nam = msg->connect.nm_nam;
1487         struct thread *td = msg->connect.nm_td;
1488         struct inpcb *inp;
1489         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1490         struct sockaddr_in *if_sin;
1491         struct lwkt_port *port;
1492         int error;
1493
1494         KKASSERT(msg->connect.nm_m == NULL);
1495
1496         inp = so->so_pcb;
1497         if (inp == NULL) {
1498                 error = EINVAL;
1499                 goto out;
1500         }
1501
1502         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1503                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1504                 in_pcblink(inp, &udbinfo[mycpuid]);
1505         }
1506
1507         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1508                 error = EISCONN;
1509                 goto out;
1510         }
1511         error = 0;
1512
1513         /*
1514          * Bind if we have to
1515          */
1516         if (inp->inp_lport == 0) {
1517                 error = in_pcbbind(inp, NULL, td);
1518                 if (error)
1519                         goto out;
1520         }
1521
1522         /*
1523          * Calculate the correct protocol processing thread.  The connect
1524          * operation must run there.
1525          */
1526         error = in_pcbladdr(inp, nam, &if_sin, td);
1527         if (error)
1528                 goto out;
1529         if (!prison_remote_ip(td, nam)) {
1530                 error = EAFNOSUPPORT; /* IPv6 only jail */
1531                 goto out;
1532         }
1533
1534         port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1535             inp->inp_laddr.s_addr != INADDR_ANY ?
1536             inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, inp->inp_lport);
1537         if (port != &curthread->td_msgport) {
1538                 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1539                 int nm_flags = PRUC_RECONNECT;
1540
1541                 /*
1542                  * in_pcbladdr() may have allocated a route entry for us
1543                  * on the current CPU, but we need a route entry on the
1544                  * inpcb's owner CPU, so free it here.
1545                  */
1546                 in_pcbresetroute(inp);
1547
1548                 if (inp->inp_flags & INP_WILDCARD) {
1549                         /*
1550                          * Remove this inpcb from the wildcard hash before
1551                          * the socket's msgport changes.
1552                          */
1553                         udp_remwildcardhash(inp);
1554                 }
1555
1556                 if (so->so_orig_port == NULL) {
1557                         /*
1558                          * First time change protocol processing port.
1559                          * Save the current port for synchronization upon
1560                          * udp_detach.
1561                          */
1562                         so->so_orig_port = &curthread->td_msgport;
1563                 } else {
1564                         /*
1565                          * We have changed protocol processing port more
1566                          * than once.  We could not do direct detach
1567                          * anymore, because we lose the track of the
1568                          * original protocol processing ports to perform
1569                          * synchronization upon udp_detach.  This should
1570                          * be rare though.
1571                          */
1572                         inp->inp_flags &= ~INP_DIRECT_DETACH;
1573                 }
1574
1575                 /*
1576                  * We are moving the protocol processing port the socket
1577                  * is on, we have to unlink here and re-link on the
1578                  * target cpu.
1579                  */
1580                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1581                 msg->connect.nm_flags |= nm_flags;
1582
1583                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1584                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1585                 lwkt_forwardmsg(port, lmsg);
1586                 /* msg invalid now */
1587                 return;
1588         }
1589         error = udp_connect_oncpu(inp, sin, if_sin);
1590 out:
1591         if (msg->connect.nm_flags & PRUC_HELDTD)
1592                 lwkt_rele(td);
1593         if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1594                 so->so_error = error;
1595                 soclrstate(so, SS_ISCONNECTED);
1596                 /*
1597                  * Wake up callers blocked on this socket to make sure
1598                  * that they can see this error.
1599                  *
1600                  * NOTE:
1601                  * sodisconnected() can't be used here, which bricks
1602                  * sending and receiving.
1603                  */
1604                 wakeup(&so->so_timeo);
1605                 sowwakeup(so);
1606                 sorwakeup(so);
1607         }
1608         if (error && inp != NULL && inp->inp_lport != 0 &&
1609             (inp->inp_flags & INP_WILDCARD) == 0) {
1610                 boolean_t forwarded;
1611
1612                 /* Connect failed; put it to wildcard hash. */
1613                 forwarded = udp_inswildcardhash(inp, &msg->connect.base,
1614                     error);
1615                 if (forwarded) {
1616                         /*
1617                          * The message is further forwarded, so we are done
1618                          * here.
1619                          */
1620                         return;
1621                 }
1622         }
1623         lwkt_replymsg(&msg->connect.base.lmsg, error);
1624 }
1625
1626 static void
1627 udp_remwildcardhash(struct inpcb *inp)
1628 {
1629         int cpu;
1630
1631         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1632             ("not on owner cpu"));
1633
1634         for (cpu = 0; cpu < ncpus2; ++cpu) {
1635                 if (cpu == mycpuid) {
1636                         /*
1637                          * This inpcb will be removed by the later
1638                          * in_pcbremwildcardhash().
1639                          */
1640                         continue;
1641                 }
1642                 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpu]);
1643         }
1644         in_pcbremwildcardhash(inp);
1645 }
1646
1647 static int
1648 udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
1649     struct sockaddr_in *if_sin)
1650 {
1651         struct socket *so = inp->inp_socket;
1652         struct inpcb *oinp;
1653
1654         oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1655             sin->sin_addr, sin->sin_port,
1656             inp->inp_laddr.s_addr != INADDR_ANY ?
1657             inp->inp_laddr : if_sin->sin_addr, inp->inp_lport, FALSE, NULL);
1658         if (oinp != NULL)
1659                 return EADDRINUSE;
1660
1661         /*
1662          * No more errors can occur, finish adjusting the socket
1663          * and change the processing port to reflect the connected
1664          * socket.  Once set we can no longer safely mess with the
1665          * socket.
1666          */
1667
1668         if (inp->inp_flags & INP_WILDCARD)
1669                 udp_remwildcardhash(inp);
1670
1671         if (inp->inp_laddr.s_addr == INADDR_ANY)
1672                 inp->inp_laddr = if_sin->sin_addr;
1673         inp->inp_faddr = sin->sin_addr;
1674         inp->inp_fport = sin->sin_port;
1675         in_pcbinsconnhash(inp);
1676
1677         soisconnected(so);
1678
1679         return 0;
1680 }
1681
1682 static void
1683 udp_detach2(struct socket *so)
1684 {
1685         in_pcbdetach(so->so_pcb);
1686         sodiscard(so);
1687         sofree(so);
1688 }
1689
1690 static void
1691 udp_detach_final_dispatch(netmsg_t msg)
1692 {
1693         udp_detach2(msg->base.nm_so);
1694 }
1695
1696 static void
1697 udp_detach_oncpu_dispatch(netmsg_t msg)
1698 {
1699         struct netmsg_base *clomsg = &msg->base;
1700         struct socket *so = clomsg->nm_so;
1701         struct inpcb *inp = so->so_pcb;
1702         struct thread *td = curthread;
1703         int nextcpu, cpuid = mycpuid;
1704
1705         KASSERT(td->td_type == TD_TYPE_NETISR, ("not in netisr"));
1706
1707         if (inp->inp_flags & INP_WILDCARD) {
1708                 /*
1709                  * This inp will be removed on the inp's
1710                  * owner CPU later, so don't do it now.
1711                  */
1712                 if (&td->td_msgport != so->so_port)
1713                         in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpuid]);
1714         }
1715
1716         if (cpuid == 0) {
1717                 /*
1718                  * Free and clear multicast socket option,
1719                  * which is only accessed in netisr0.
1720                  */
1721                 ip_freemoptions(inp->inp_moptions);
1722                 inp->inp_moptions = NULL;
1723         }
1724
1725         nextcpu = cpuid + 1;
1726         if (nextcpu < ncpus2) {
1727                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &clomsg->lmsg);
1728         } else {
1729                 /*
1730                  * No one could see this inpcb now; destroy this
1731                  * inpcb in its owner netisr.
1732                  */
1733                 netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1734                     udp_detach_final_dispatch);
1735                 lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1736         }
1737 }
1738
1739 static void
1740 udp_detach_syncorig_dispatch(netmsg_t msg)
1741 {
1742         struct netmsg_base *clomsg = &msg->base;
1743         struct socket *so = clomsg->nm_so;
1744
1745         /*
1746          * Original protocol processing port is synchronized;
1747          * destroy this inpcb in its owner netisr.
1748          */
1749         netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1750             udp_detach_final_dispatch);
1751         lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1752 }
1753
1754 static void
1755 udp_detach(netmsg_t msg)
1756 {
1757         struct socket *so = msg->detach.base.nm_so;
1758         struct netmsg_base *clomsg;
1759         struct inpcb *inp;
1760
1761         inp = so->so_pcb;
1762         if (inp == NULL) {
1763                 lwkt_replymsg(&msg->detach.base.lmsg, EINVAL);
1764                 return;
1765         }
1766
1767         /*
1768          * Reply EJUSTRETURN ASAP, we will call sodiscard() and
1769          * sofree() later.
1770          */
1771         lwkt_replymsg(&msg->detach.base.lmsg, EJUSTRETURN);
1772
1773         if (ncpus2 == 1) {
1774                 /* Only one CPU, detach the inpcb directly. */
1775                 udp_detach2(so);
1776                 return;
1777         }
1778
1779         /*
1780          * Remove this inpcb from the inpcb list first, so that
1781          * no one could find this inpcb from the inpcb list.
1782          */
1783         in_pcbofflist(inp);
1784
1785         /*
1786          * Remove this inpcb from the local port hash directly
1787          * here, so that its bound local port could be recycled
1788          * timely.
1789          */
1790         in_pcbremporthash(inp);
1791
1792         if (inp->inp_flags & INP_DIRECT_DETACH) {
1793                 /*
1794                  * Direct detaching is allowed
1795                  */
1796                 KASSERT((inp->inp_flags & INP_WILDCARD) == 0,
1797                     ("in the wildcardhash"));
1798                 KASSERT(inp->inp_moptions == NULL, ("has mcast options"));
1799                 if (so->so_orig_port == NULL) {
1800                         udp_detach2(so);
1801                 } else {
1802                         /*
1803                          * Protocol processing port changed once, so
1804                          * we need to make sure that there are nothing
1805                          * left on the original protocol processing
1806                          * port before we destroy this socket and inpcb.
1807                          * This is more lightweight than going through
1808                          * all UDP processing netisrs.
1809                          */
1810                         clomsg = &so->so_clomsg;
1811                         netmsg_init(clomsg, so, &netisr_apanic_rport,
1812                             MSGF_IGNSOPORT, udp_detach_syncorig_dispatch);
1813                         lwkt_sendmsg(so->so_orig_port, &clomsg->lmsg);
1814                 }
1815                 return;
1816         }
1817
1818         /*
1819          * Go through netisrs which process UDP to make sure
1820          * no one could find this inpcb anymore.
1821          */
1822         clomsg = &so->so_clomsg;
1823         netmsg_init(clomsg, so, &netisr_apanic_rport, MSGF_IGNSOPORT,
1824             udp_detach_oncpu_dispatch);
1825         lwkt_sendmsg(netisr_cpuport(0), &clomsg->lmsg);
1826 }
1827
1828 static void
1829 udp_disconnect(netmsg_t msg)
1830 {
1831         struct socket *so = msg->disconnect.base.nm_so;
1832         struct inpcb *inp;
1833         boolean_t forwarded;
1834         int error = 0;
1835
1836         inp = so->so_pcb;
1837         if (inp == NULL) {
1838                 error = EINVAL;
1839                 goto out;
1840         }
1841         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1842                 error = ENOTCONN;
1843                 goto out;
1844         }
1845
1846         soclrstate(so, SS_ISCONNECTED);         /* XXX */
1847
1848         in_pcbdisconnect(inp);
1849
1850         /*
1851          * Follow traditional BSD behavior and retain the local port
1852          * binding.  But, fix the old misbehavior of overwriting any
1853          * previously bound local address.
1854          */
1855         if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1856                 inp->inp_laddr.s_addr = INADDR_ANY;
1857
1858         if (so->so_state & SS_ISCLOSING) {
1859                 /*
1860                  * If this socket is being closed, there is no need
1861                  * to put this socket back into wildcard hash table.
1862                  */
1863                 error = 0;
1864                 goto out;
1865         }
1866
1867         forwarded = udp_inswildcardhash(inp, &msg->disconnect.base, 0);
1868         if (forwarded) {
1869                 /*
1870                  * The message is further forwarded, so we are done
1871                  * here.
1872                  */
1873                 return;
1874         }
1875 out:
1876         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1877 }
1878
1879 void
1880 udp_shutdown(netmsg_t msg)
1881 {
1882         struct socket *so = msg->shutdown.base.nm_so;
1883         struct inpcb *inp;
1884         int error;
1885
1886         inp = so->so_pcb;
1887         if (inp) {
1888                 socantsendmore(so);
1889                 error = 0;
1890         } else {
1891                 error = EINVAL;
1892         }
1893         lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1894 }
1895
1896 struct pr_usrreqs udp_usrreqs = {
1897         .pru_abort = udp_abort,
1898         .pru_accept = pr_generic_notsupp,
1899         .pru_attach = udp_attach,
1900         .pru_bind = udp_bind,
1901         .pru_connect = udp_connect,
1902         .pru_connect2 = pr_generic_notsupp,
1903         .pru_control = in_control_dispatch,
1904         .pru_detach = udp_detach,
1905         .pru_disconnect = udp_disconnect,
1906         .pru_listen = pr_generic_notsupp,
1907         .pru_peeraddr = in_setpeeraddr_dispatch,
1908         .pru_rcvd = pr_generic_notsupp,
1909         .pru_rcvoob = pr_generic_notsupp,
1910         .pru_send = udp_send,
1911         .pru_sense = pru_sense_null,
1912         .pru_shutdown = udp_shutdown,
1913         .pru_sockaddr = in_setsockaddr_dispatch,
1914         .pru_sosend = sosendudp,
1915         .pru_soreceive = soreceive,
1916         .pru_preconnect = udp_preconnect,
1917         .pru_preattach = udp_preattach
1918 };