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, uint16_t hash);
 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 src[INET_ADDRSTRLEN], dst[INET_ADDRSTRLEN];
 627
 628                         log(LOG_INFO,
 629                             "Connection attempt to UDP %s:%d from %s:%d\n",
 630                             kinet_ntoa(ip->ip_dst, dst), ntohs(uh->uh_dport),
 631                             kinet_ntoa(ip->ip_src, src), ntohs(uh->uh_sport));
 632                 }
 633                 udp_stat.udps_noport++;
 634                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 635                         udp_stat.udps_noportbcast++;
 636                         goto bad;
 637                 }
 638                 if (blackhole)
 639                         goto bad;
 640 #ifdef ICMP_BANDLIM
 641                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 642                         goto bad;
 643 #endif
 644                 *ip = save_ip;
 645                 ip->ip_len += iphlen;
 646                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 647                 return(IPPROTO_DONE);
 648         }
 649         KASSERT(INP_ISIPV4(inp), ("not inet inpcb"));
 650 #ifdef IPSEC
 651         if (ipsec4_in_reject_so(m, inp->inp_socket)) {
 652                 ipsecstat.in_polvio++;
 653                 goto bad;
 654         }
 655 #endif /*IPSEC*/
 656 #ifdef FAST_IPSEC
 657         if (ipsec4_in_reject(m, inp))
 658                 goto bad;
 659 #endif /*FAST_IPSEC*/
 660         /*
 661          * Check the minimum TTL for socket.
 662          */
 663         if (ip->ip_ttl < inp->inp_ip_minttl)
 664                 goto bad;
 665
 666         /*
 667          * Construct sockaddr format source address.
 668          * Stuff source address and datagram in user buffer.
 669          */
 670         udp_in.sin_port = uh->uh_sport;
 671         udp_in.sin_addr = ip->ip_src;
 672         if ((inp->inp_flags & INP_CONTROLOPTS) ||
 673             (inp->inp_socket->so_options & SO_TIMESTAMP))
 674                 ip_savecontrol(inp, &opts, ip, m);
 675         m_adj(m, iphlen + sizeof(struct udphdr));
 676
 677         lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
 678         if (ssb_appendaddr(&inp->inp_socket->so_rcv,
 679             (struct sockaddr *)&udp_in, m, opts) == 0) {
 680                 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 681                 udp_stat.udps_fullsock++;
 682                 goto bad;
 683         }
 684         lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 685         sorwakeup(inp->inp_socket);
 686         return(IPPROTO_DONE);
 687 bad:
 688         m_freem(m);
 689         if (opts)
 690                 m_freem(opts);
 691         return(IPPROTO_DONE);
 692 }
 693
 694 /*
 695  * subroutine of udp_input(), mainly for source code readability.
 696  * caller must properly init udp_ip6 and udp_in6 beforehand.
 697  */
 698 static void
 699 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off,
 700     struct sockaddr_in *udp_in)
 701 {
 702         struct mbuf *opts = NULL;
 703         int ret;
 704
 705         KASSERT(INP_ISIPV4(last), ("not inet inpcb"));
 706
 707         if (last->inp_flags & INP_CONTROLOPTS ||
 708             last->inp_socket->so_options & SO_TIMESTAMP)
 709                 ip_savecontrol(last, &opts, ip, n);
 710         m_adj(n, off);
 711
 712         lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
 713         ret = ssb_appendaddr(&last->inp_socket->so_rcv,
 714             (struct sockaddr *)udp_in, n, opts);
 715         lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
 716         if (ret == 0) {
 717                 m_freem(n);
 718                 if (opts)
 719                         m_freem(opts);
 720                 udp_stat.udps_fullsock++;
 721         } else {
 722                 sorwakeup(last->inp_socket);
 723         }
 724 }
 725
 726 /*
 727  * Notify a udp user of an asynchronous error;
 728  * just wake up so that he can collect error status.
 729  */
 730 void
 731 udp_notify(struct inpcb *inp, int error)
 732 {
 733         inp->inp_socket->so_error = error;
 734         sorwakeup(inp->inp_socket);
 735         sowwakeup(inp->inp_socket);
 736 }
 737
 738 struct netmsg_udp_notify {
 739         struct netmsg_base base;
 740         inp_notify_t    nm_notify;
 741         struct in_addr  nm_faddr;
 742         int             nm_arg;
 743 };
 744
 745 static void
 746 udp_notifyall_oncpu(netmsg_t msg)
 747 {
 748         struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
 749         int nextcpu, cpu = mycpuid;
 750
 751         in_pcbnotifyall(&udbinfo[cpu], nm->nm_faddr, nm->nm_arg, nm->nm_notify);
 752
 753         nextcpu = cpu + 1;
 754         if (nextcpu < ncpus2)
 755                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 756         else
 757                 lwkt_replymsg(&nm->base.lmsg, 0);
 758 }
 759
 760 inp_notify_t
 761 udp_get_inpnotify(int cmd, const struct sockaddr *sa,
 762     struct ip **ip0, int *cpuid)
 763 {
 764         struct in_addr faddr;
 765         struct ip *ip = *ip0;
 766         inp_notify_t notify = udp_notify;
 767
 768         faddr = ((const struct sockaddr_in *)sa)->sin_addr;
 769         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 770                 return NULL;
 771
 772         if (PRC_IS_REDIRECT(cmd)) {
 773                 ip = NULL;
 774                 notify = in_rtchange;
 775         } else if (cmd == PRC_HOSTDEAD) {
 776                 ip = NULL;
 777         } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
 778                 return NULL;
 779         }
 780
 781         if (cpuid != NULL) {
 782                 if (ip == NULL) {
 783                         /* Go through all CPUs */
 784                         *cpuid = ncpus;
 785                 } else {
 786                         const struct udphdr *uh;
 787
 788                         uh = (const struct udphdr *)
 789                             ((caddr_t)ip + (ip->ip_hl << 2));
 790                         *cpuid = udp_addrcpu(faddr.s_addr, uh->uh_dport,
 791                             ip->ip_src.s_addr, uh->uh_sport);
 792                 }
 793         }
 794
 795         *ip0 = ip;
 796         return notify;
 797 }
 798
 799 void
 800 udp_ctlinput(netmsg_t msg)
 801 {
 802         struct sockaddr *sa = msg->ctlinput.nm_arg;
 803         struct ip *ip = msg->ctlinput.nm_extra;
 804         int cmd = msg->ctlinput.nm_cmd, cpuid;
 805         inp_notify_t notify;
 806         struct in_addr faddr;
 807
 808         notify = udp_get_inpnotify(cmd, sa, &ip, &cpuid);
 809         if (notify == NULL)
 810                 goto done;
 811
 812         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 813         if (ip) {
 814                 const struct udphdr *uh;
 815                 struct inpcb *inp;
 816
 817                 if (cpuid != mycpuid)
 818                         goto done;
 819
 820                 uh = (const struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 821                 inp = in_pcblookup_hash(&udbinfo[mycpuid], faddr, uh->uh_dport,
 822                                         ip->ip_src, uh->uh_sport, 0, NULL);
 823                 if (inp != NULL && inp->inp_socket != NULL)
 824                         notify(inp, inetctlerrmap[cmd]);
 825         } else if (msg->ctlinput.nm_direct) {
 826                 if (cpuid != ncpus && cpuid != mycpuid)
 827                         goto done;
 828                 if (mycpuid >= ncpus2)
 829                         goto done;
 830
 831                 in_pcbnotifyall(&udbinfo[mycpuid], faddr, inetctlerrmap[cmd],
 832                     notify);
 833         } else {
 834                 struct netmsg_udp_notify *nm;
 835
 836                 ASSERT_IN_NETISR(0);
 837                 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
 838                 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
 839                             0, udp_notifyall_oncpu);
 840                 nm->nm_faddr = faddr;
 841                 nm->nm_arg = inetctlerrmap[cmd];
 842                 nm->nm_notify = notify;
 843                 lwkt_sendmsg(netisr_cpuport(0), &nm->base.lmsg);
 844         }
 845 done:
 846         lwkt_replymsg(&msg->lmsg, 0);
 847 }
 848
 849 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, udbinfo, 0,
 850             in_pcblist_global_ncpus2, "S,xinpcb", "List of active UDP sockets");
 851
 852 static int
 853 udp_getcred(SYSCTL_HANDLER_ARGS)
 854 {
 855         struct sockaddr_in addrs[2];
 856         struct ucred cred0, *cred = NULL;
 857         struct inpcb *inp;
 858         int error, cpu, origcpu;
 859
 860         error = priv_check(req->td, PRIV_ROOT);
 861         if (error)
 862                 return (error);
 863         error = SYSCTL_IN(req, addrs, sizeof addrs);
 864         if (error)
 865                 return (error);
 866
 867         origcpu = mycpuid;
 868         cpu = udp_addrcpu(addrs[1].sin_addr.s_addr, addrs[1].sin_port,
 869             addrs[0].sin_addr.s_addr, addrs[0].sin_port);
 870
 871         lwkt_migratecpu(cpu);
 872
 873         inp = in_pcblookup_hash(&udbinfo[cpu],
 874             addrs[1].sin_addr, addrs[1].sin_port,
 875             addrs[0].sin_addr, addrs[0].sin_port, TRUE, NULL);
 876         if (inp == NULL || inp->inp_socket == NULL) {
 877                 error = ENOENT;
 878         } else if (inp->inp_socket->so_cred != NULL) {
 879                 cred0 = *(inp->inp_socket->so_cred);
 880                 cred = &cred0;
 881         }
 882
 883         lwkt_migratecpu(origcpu);
 884
 885         if (error)
 886                 return error;
 887
 888         return SYSCTL_OUT(req, cred, sizeof(struct ucred));
 889 }
 890 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 891     0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
 892
 893 static void
 894 udp_send_redispatch(netmsg_t msg)
 895 {
 896         struct mbuf *m = msg->send.nm_m;
 897         int pru_flags = msg->send.nm_flags;
 898         struct inpcb *inp = msg->send.base.nm_so->so_pcb;
 899         struct mbuf *m_opt = msg->send.nm_control; /* XXX save ipopt */
 900         int flags = msg->send.nm_priv; /* ip_output flags */
 901         int error;
 902
 903         logudp(redisp_ipout_beg, inp);
 904
 905         /*
 906          * - Don't use inp route cache.  It should only be used in the
 907          *   inp owner netisr.
 908          * - Access to inp_moptions should be safe, since multicast UDP
 909          *   datagrams are redispatched to netisr0 and inp_moptions is
 910          *   changed only in netisr0.
 911          */
 912         error = ip_output(m, m_opt, NULL, flags, inp->inp_moptions, inp);
 913         if ((pru_flags & PRUS_NOREPLY) == 0)
 914                 lwkt_replymsg(&msg->send.base.lmsg, error);
 915
 916         if (m_opt != NULL) {
 917                 /* Free saved ip options, if any */
 918                 m_freem(m_opt);
 919         }
 920
 921         logudp(redisp_ipout_end, inp);
 922 }
 923
 924 static void
 925 udp_send(netmsg_t msg)
 926 {
 927         struct socket *so = msg->send.base.nm_so;
 928         struct mbuf *m = msg->send.nm_m;
 929         struct sockaddr *dstaddr = msg->send.nm_addr;
 930         int pru_flags = msg->send.nm_flags;
 931         struct inpcb *inp = so->so_pcb;
 932         struct thread *td = msg->send.nm_td;
 933         uint16_t hash;
 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                 KASSERT(inp->inp_flags & INP_HASH, ("inpcb has no hash"));
1100                 m_sethash(m, inp->inp_hashval);
1101                 goto sendit;
1102         }
1103
1104         hash = udp_addrhash(ui->ui_dst.s_addr, ui->ui_dport,
1105             ui->ui_src.s_addr, ui->ui_sport);
1106         m_sethash(m, hash);
1107
1108         cpu = netisr_hashcpu(hash);
1109         if (cpu != mycpuid) {
1110                 struct mbuf *m_opt = NULL;
1111                 struct netmsg_pru_send *smsg;
1112                 struct lwkt_port *port = netisr_cpuport(cpu);
1113
1114                 /*
1115                  * Not on the CPU that matches this UDP datagram hash;
1116                  * redispatch to the correct CPU to do the ip_output().
1117                  */
1118                 if (inp->inp_options != NULL) {
1119                         /*
1120                          * If there are ip options, then save a copy,
1121                          * since accessing inp_options on other CPUs'
1122                          * is not safe.
1123                          *
1124                          * XXX optimize this?
1125                          */
1126                         m_opt = m_copym(inp->inp_options, 0, M_COPYALL,
1127                             M_WAITOK);
1128                 }
1129                 if ((pru_flags & PRUS_NOREPLY) == 0) {
1130                         /*
1131                          * Change some parts of the original netmsg and
1132                          * forward it to the target netisr.
1133                          *
1134                          * NOTE: so_port MUST NOT be checked in the target
1135                          * netisr.
1136                          */
1137                         smsg = &msg->send;
1138                         smsg->nm_priv = flags; /* ip_output flags */
1139                         smsg->nm_m = m;
1140                         smsg->nm_control = m_opt; /* XXX save ipopt */
1141                         smsg->base.lmsg.ms_flags |= MSGF_IGNSOPORT;
1142                         smsg->base.nm_dispatch = udp_send_redispatch;
1143                         lwkt_forwardmsg(port, &smsg->base.lmsg);
1144                 } else {
1145                         /*
1146                          * Recreate the netmsg, since the original mbuf
1147                          * could have been changed.  And send it to the
1148                          * target netisr.
1149                          *
1150                          * NOTE: so_port MUST NOT be checked in the target
1151                          * netisr.
1152                          */
1153                         smsg = &m->m_hdr.mh_sndmsg;
1154                         netmsg_init(&smsg->base, so, &netisr_apanic_rport,
1155                             MSGF_IGNSOPORT, udp_send_redispatch);
1156                         smsg->nm_priv = flags; /* ip_output flags */
1157                         smsg->nm_flags = pru_flags;
1158                         smsg->nm_m = m;
1159                         smsg->nm_control = m_opt; /* XXX save ipopt */
1160                         lwkt_sendmsg(port, &smsg->base.lmsg);
1161                 }
1162
1163                 /* This UDP datagram is redispatched; done */
1164                 logudp(send_redisp, inp);
1165                 return;
1166         }
1167
1168 sendit:
1169         logudp(send_ipout, inp);
1170         error = ip_output(m, inp->inp_options, &inp->inp_route, flags,
1171             inp->inp_moptions, inp);
1172         m = NULL;
1173
1174 release:
1175         if (m != NULL)
1176                 m_freem(m);
1177
1178         if (pru_flags & PRUS_HELDTD)
1179                 lwkt_rele(td);
1180         if (pru_flags & PRUS_FREEADDR)
1181                 kfree(dstaddr, M_SONAME);
1182         if ((pru_flags & PRUS_NOREPLY) == 0)
1183                 lwkt_replymsg(&msg->send.base.lmsg, error);
1184
1185         logudp(send_end, inp);
1186 }
1187
1188 u_long  udp_sendspace = 9216;           /* really max datagram size */
1189                                         /* 40 1K datagrams */
1190 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
1191     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
1192
1193 u_long  udp_recvspace = 40 * (1024 +
1194 #ifdef INET6
1195                                       sizeof(struct sockaddr_in6)
1196 #else
1197                                       sizeof(struct sockaddr_in)
1198 #endif
1199                                       );
1200 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1201     &udp_recvspace, 0, "Maximum incoming UDP datagram size");
1202
1203 /*
1204  * This should never happen, since UDP socket does not support
1205  * connection acception (SO_ACCEPTCONN, i.e. listen(2)).
1206  */
1207 static void
1208 udp_abort(netmsg_t msg __unused)
1209 {
1210         panic("udp_abort is called");
1211 }
1212
1213 static int
1214 udp_preattach(struct socket *so, int proto __unused, struct pru_attach_info *ai)
1215 {
1216         return soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1217 }
1218
1219 static void
1220 udp_attach(netmsg_t msg)
1221 {
1222         struct socket *so = msg->attach.base.nm_so;
1223         struct pru_attach_info *ai = msg->attach.nm_ai;
1224         struct inpcb *inp;
1225         int error;
1226
1227         KASSERT(so->so_pcb == NULL, ("udp socket attached"));
1228
1229         if (ai != NULL) {
1230                 error = udp_preattach(so, 0 /* don't care */, ai);
1231                 if (error)
1232                         goto out;
1233         } else {
1234                 /* Post attach; do nothing */
1235         }
1236
1237         error = in_pcballoc(so, &udbinfo[mycpuid]);
1238         if (error)
1239                 goto out;
1240
1241         inp = so->so_pcb;
1242         inp->inp_flags |= INP_DIRECT_DETACH;
1243         inp->inp_ip_ttl = ip_defttl;
1244         error = 0;
1245 out:
1246         lwkt_replymsg(&msg->attach.base.lmsg, error);
1247 }
1248
1249 static void
1250 udp_inswildcard_replymsg(netmsg_t msg)
1251 {
1252         lwkt_msg_t lmsg = &msg->lmsg;
1253
1254         if (lmsg->ms_flags & MSGF_UDP_SEND) {
1255                 udp_send(msg);
1256                 /* msg is replied by udp_send() */
1257         } else {
1258                 lwkt_replymsg(lmsg, lmsg->ms_error);
1259         }
1260 }
1261
1262 static void
1263 udp_soreuseport_dispatch(netmsg_t msg)
1264 {
1265         /* This inpcb has already been in the wildcard hash. */
1266         in_pcblink_flags(msg->base.nm_so->so_pcb, &udbinfo[mycpuid], 0);
1267         udp_inswildcard_replymsg(msg);
1268 }
1269
1270 static void
1271 udp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
1272 {
1273         sosetport(((struct netmsg_base *)msg)->nm_so, port);
1274 }
1275
1276 static boolean_t
1277 udp_inswildcardhash_oncpu(struct inpcb *inp, struct netmsg_base *msg)
1278 {
1279         int cpu;
1280
1281         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1282             ("not on owner cpu"));
1283
1284         in_pcbinswildcardhash(inp);
1285         for (cpu = 0; cpu < ncpus2; ++cpu) {
1286                 if (cpu == mycpuid) {
1287                         /*
1288                          * This inpcb has been inserted by the above
1289                          * in_pcbinswildcardhash().
1290                          */
1291                         continue;
1292                 }
1293                 in_pcbinswildcardhash_oncpu(inp, &udbinfo[cpu]);
1294         }
1295
1296         if (inp->inp_socket->so_options & SO_REUSEPORT) {
1297                 /*
1298                  * For SO_REUSEPORT socket, redistribute it based on its
1299                  * local group index.
1300                  */
1301                 cpu = inp->inp_lgrpindex & ncpus2_mask;
1302                 if (cpu != mycpuid) {
1303                         struct lwkt_port *port = netisr_cpuport(cpu);
1304                         lwkt_msg_t lmsg = &msg->lmsg;
1305
1306                         /*
1307                          * We are moving the protocol processing port the
1308                          * socket is on, we have to unlink here and re-link
1309                          * on the target cpu (this inpcb is still left in
1310                          * the wildcard hash).
1311                          */
1312                         in_pcbunlink_flags(inp, &udbinfo[mycpuid], 0);
1313                         msg->nm_dispatch = udp_soreuseport_dispatch;
1314
1315                         /*
1316                          * See the related comment in tcp_usrreq.c
1317                          * tcp_connect()
1318                          */
1319                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1320                         lwkt_forwardmsg(port, lmsg);
1321                         return TRUE; /* forwarded */
1322                 }
1323         }
1324         return FALSE;
1325 }
1326
1327 static void
1328 udp_inswildcardhash_dispatch(netmsg_t msg)
1329 {
1330         struct inpcb *inp = msg->base.nm_so->so_pcb;
1331         boolean_t forwarded;
1332
1333         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1334         KASSERT(udp_lportcpu(inp->inp_lport) == mycpuid, ("not target cpu"));
1335
1336         in_pcblink(inp, &udbinfo[mycpuid]);
1337
1338         forwarded = udp_inswildcardhash_oncpu(inp, &msg->base);
1339         if (forwarded) {
1340                 /* The message is further forwarded, so we are done here. */
1341                 return;
1342         }
1343         udp_inswildcard_replymsg(msg);
1344 }
1345
1346 static boolean_t
1347 udp_inswildcardhash(struct inpcb *inp, struct netmsg_base *msg, int error)
1348 {
1349         lwkt_msg_t lmsg = &msg->lmsg;
1350         int cpu;
1351
1352         ASSERT_INP_NOTINHASH(inp);
1353
1354         /* This inpcb could no longer be directly detached */
1355         inp->inp_flags &= ~INP_DIRECT_DETACH;
1356
1357         /*
1358          * Always clear the route cache, so we don't need to
1359          * worry about any owner CPU changes later.
1360          */
1361         in_pcbresetroute(inp);
1362
1363         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1364         cpu = udp_lportcpu(inp->inp_lport);
1365
1366         lmsg->ms_error = error;
1367         if (cpu != mycpuid) {
1368                 struct lwkt_port *port = netisr_cpuport(cpu);
1369
1370                 /*
1371                  * We are moving the protocol processing port the socket
1372                  * is on, we have to unlink here and re-link on the
1373                  * target cpu.
1374                  */
1375                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1376                 msg->nm_dispatch = udp_inswildcardhash_dispatch;
1377
1378                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1379                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1380                 lwkt_forwardmsg(port, lmsg);
1381                 return TRUE; /* forwarded */
1382         }
1383
1384         return udp_inswildcardhash_oncpu(inp, msg);
1385 }
1386
1387 static void
1388 udp_bind(netmsg_t msg)
1389 {
1390         struct socket *so = msg->bind.base.nm_so;
1391         struct inpcb *inp;
1392         int error;
1393
1394         inp = so->so_pcb;
1395         if (inp) {
1396                 struct sockaddr *nam = msg->bind.nm_nam;
1397                 struct thread *td = msg->bind.nm_td;
1398                 struct sockaddr_in *sin;
1399                 lwkt_port_t port;
1400                 int cpu;
1401
1402                 /*
1403                  * Check "already bound" here (in_pcbbind() does the same
1404                  * check though), so we don't forward a connected/bound
1405                  * socket randomly which would panic in the following
1406                  * in_pcbunlink().
1407                  */
1408                 if (inp->inp_lport != 0 ||
1409                     inp->inp_laddr.s_addr != INADDR_ANY) {
1410                         error = EINVAL; /* already bound */
1411                         goto done;
1412                 }
1413
1414                 if (nam->sa_len != sizeof(*sin)) {
1415                         error = EINVAL;
1416                         goto done;
1417                 }
1418                 sin = (struct sockaddr_in *)nam;
1419
1420                 cpu = udp_lportcpu(sin->sin_port);
1421                 port = netisr_cpuport(cpu);
1422
1423                 /*
1424                  * See the related comment in tcp_usrreq.c tcp_usr_bind().
1425                  * The exception is that we use local port based netisr
1426                  * to serialize in_pcbbind().
1427                  */
1428                 if (&curthread->td_msgport != port) {
1429                         lwkt_msg_t lmsg = &msg->bind.base.lmsg;
1430
1431                         KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0,
1432                             ("already asked to relink"));
1433
1434                         in_pcbunlink(so->so_pcb, &udbinfo[mycpuid]);
1435                         msg->bind.nm_flags |= PRUB_RELINK;
1436
1437                         /*
1438                          * See the related comment in tcp_usrreq.c
1439                          * tcp_connect().
1440                          */
1441                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1442                         lwkt_forwardmsg(port, lmsg);
1443                         /* msg invalid now */
1444                         return;
1445                 }
1446                 KASSERT(so->so_port == port, ("so_port is not netisr%d", cpu));
1447
1448                 if (msg->bind.nm_flags & PRUB_RELINK) {
1449                         msg->bind.nm_flags &= ~PRUB_RELINK;
1450                         in_pcblink(so->so_pcb, &udbinfo[mycpuid]);
1451                 }
1452                 KASSERT(inp->inp_pcbinfo == &udbinfo[cpu],
1453                     ("pcbinfo is not udbinfo%d", cpu));
1454
1455                 error = in_pcbbind(inp, nam, td);
1456                 if (error == 0) {
1457                         boolean_t forwarded;
1458
1459                         if (sin->sin_addr.s_addr != INADDR_ANY)
1460                                 inp->inp_flags |= INP_WASBOUND_NOTANY;
1461
1462                         forwarded = udp_inswildcardhash(inp,
1463                             &msg->bind.base, 0);
1464                         if (forwarded) {
1465                                 /*
1466                                  * The message is further forwarded, so
1467                                  * we are done here.
1468                                  */
1469                                 return;
1470                         }
1471                 }
1472         } else {
1473                 error = EINVAL;
1474         }
1475 done:
1476         lwkt_replymsg(&msg->bind.base.lmsg, error);
1477 }
1478
1479 static int
1480 udp_preconnect(struct socket *so, const struct sockaddr *nam __unused,
1481     struct thread *td __unused)
1482 {
1483         sosetstate(so, SS_ISCONNECTED);         /* XXX */
1484         return 0;
1485 }
1486
1487 static void
1488 udp_connect(netmsg_t msg)
1489 {
1490         struct socket *so = msg->connect.base.nm_so;
1491         struct sockaddr *nam = msg->connect.nm_nam;
1492         struct thread *td = msg->connect.nm_td;
1493         struct inpcb *inp;
1494         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1495         struct sockaddr_in *if_sin;
1496         struct lwkt_port *port;
1497         uint16_t hash;
1498         int error;
1499
1500         KKASSERT(msg->connect.nm_m == NULL);
1501
1502         inp = so->so_pcb;
1503         if (inp == NULL) {
1504                 error = EINVAL;
1505                 goto out;
1506         }
1507
1508         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1509                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1510                 in_pcblink(inp, &udbinfo[mycpuid]);
1511         }
1512
1513         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1514                 error = EISCONN;
1515                 goto out;
1516         }
1517         error = 0;
1518
1519         /*
1520          * Bind if we have to
1521          */
1522         if (inp->inp_lport == 0) {
1523                 error = in_pcbbind(inp, NULL, td);
1524                 if (error)
1525                         goto out;
1526         }
1527
1528         /*
1529          * Calculate the correct protocol processing thread.  The connect
1530          * operation must run there.
1531          */
1532         error = in_pcbladdr(inp, nam, &if_sin, td);
1533         if (error)
1534                 goto out;
1535         if (!prison_remote_ip(td, nam)) {
1536                 error = EAFNOSUPPORT; /* IPv6 only jail */
1537                 goto out;
1538         }
1539
1540         hash = udp_addrhash(sin->sin_addr.s_addr, sin->sin_port,
1541             inp->inp_laddr.s_addr != INADDR_ANY ?
1542             inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, inp->inp_lport);
1543         port = netisr_hashport(hash);
1544         if (port != &curthread->td_msgport) {
1545                 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1546                 int nm_flags = PRUC_RECONNECT;
1547
1548                 /*
1549                  * in_pcbladdr() may have allocated a route entry for us
1550                  * on the current CPU, but we need a route entry on the
1551                  * inpcb's owner CPU, so free it here.
1552                  */
1553                 in_pcbresetroute(inp);
1554
1555                 if (inp->inp_flags & INP_WILDCARD) {
1556                         /*
1557                          * Remove this inpcb from the wildcard hash before
1558                          * the socket's msgport changes.
1559                          */
1560                         udp_remwildcardhash(inp);
1561                 }
1562
1563                 if (so->so_orig_port == NULL) {
1564                         /*
1565                          * First time change protocol processing port.
1566                          * Save the current port for synchronization upon
1567                          * udp_detach.
1568                          */
1569                         so->so_orig_port = &curthread->td_msgport;
1570                 } else {
1571                         /*
1572                          * We have changed protocol processing port more
1573                          * than once.  We could not do direct detach
1574                          * anymore, because we lose the track of the
1575                          * original protocol processing ports to perform
1576                          * synchronization upon udp_detach.  This should
1577                          * be rare though.
1578                          */
1579                         inp->inp_flags &= ~INP_DIRECT_DETACH;
1580                 }
1581
1582                 /*
1583                  * We are moving the protocol processing port the socket
1584                  * is on, we have to unlink here and re-link on the
1585                  * target cpu.
1586                  */
1587                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1588                 msg->connect.nm_flags |= nm_flags;
1589
1590                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1591                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1592                 lwkt_forwardmsg(port, lmsg);
1593                 /* msg invalid now */
1594                 return;
1595         }
1596         error = udp_connect_oncpu(inp, sin, if_sin, hash);
1597 out:
1598         if (msg->connect.nm_flags & PRUC_HELDTD)
1599                 lwkt_rele(td);
1600         if (error && (msg->connect.nm_flags & PRUC_ASYNC)) {
1601                 if (inp->inp_lport == 0) {
1602                         /*
1603                          * As long as we have the local port, it is fine
1604                          * for connect to fail, e.g. disconnect.
1605                          */
1606                         so->so_error = error;
1607                 }
1608                 soclrstate(so, SS_ISCONNECTED);
1609                 /*
1610                  * Wake up callers blocked on this socket to make sure
1611                  * that they can see this error.
1612                  *
1613                  * NOTE:
1614                  * sodisconnected() can't be used here, which bricks
1615                  * sending and receiving.
1616                  */
1617                 wakeup(&so->so_timeo);
1618                 sowwakeup(so);
1619                 sorwakeup(so);
1620         }
1621         if (error && inp != NULL && inp->inp_lport != 0 &&
1622             (inp->inp_flags & INP_WILDCARD) == 0) {
1623                 boolean_t forwarded;
1624
1625                 /* Connect failed; put it to wildcard hash. */
1626                 forwarded = udp_inswildcardhash(inp, &msg->connect.base,
1627                     error);
1628                 if (forwarded) {
1629                         /*
1630                          * The message is further forwarded, so we are done
1631                          * here.
1632                          */
1633                         return;
1634                 }
1635         }
1636         lwkt_replymsg(&msg->connect.base.lmsg, error);
1637 }
1638
1639 static void
1640 udp_remwildcardhash(struct inpcb *inp)
1641 {
1642         int cpu;
1643
1644         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1645             ("not on owner cpu"));
1646
1647         for (cpu = 0; cpu < ncpus2; ++cpu) {
1648                 if (cpu == mycpuid) {
1649                         /*
1650                          * This inpcb will be removed by the later
1651                          * in_pcbremwildcardhash().
1652                          */
1653                         continue;
1654                 }
1655                 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpu]);
1656         }
1657         in_pcbremwildcardhash(inp);
1658 }
1659
1660 static int
1661 udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
1662     struct sockaddr_in *if_sin, uint16_t hash)
1663 {
1664         struct socket *so = inp->inp_socket;
1665         struct inpcb *oinp;
1666
1667         oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1668             sin->sin_addr, sin->sin_port,
1669             inp->inp_laddr.s_addr != INADDR_ANY ?
1670             inp->inp_laddr : if_sin->sin_addr, inp->inp_lport, FALSE, NULL);
1671         if (oinp != NULL)
1672                 return EADDRINUSE;
1673
1674         /*
1675          * No more errors can occur, finish adjusting the socket
1676          * and change the processing port to reflect the connected
1677          * socket.  Once set we can no longer safely mess with the
1678          * socket.
1679          */
1680
1681         if (inp->inp_flags & INP_WILDCARD)
1682                 udp_remwildcardhash(inp);
1683
1684         if (inp->inp_laddr.s_addr == INADDR_ANY)
1685                 inp->inp_laddr = if_sin->sin_addr;
1686         inp->inp_faddr = sin->sin_addr;
1687         inp->inp_fport = sin->sin_port;
1688         in_pcbinsconnhash(inp);
1689
1690         inp->inp_flags |= INP_HASH;
1691         inp->inp_hashval = hash;
1692
1693         soisconnected(so);
1694
1695         return 0;
1696 }
1697
1698 static void
1699 udp_detach2(struct socket *so)
1700 {
1701         in_pcbdetach(so->so_pcb);
1702         sodiscard(so);
1703         sofree(so);
1704 }
1705
1706 static void
1707 udp_detach_final_dispatch(netmsg_t msg)
1708 {
1709         udp_detach2(msg->base.nm_so);
1710 }
1711
1712 static void
1713 udp_detach_oncpu_dispatch(netmsg_t msg)
1714 {
1715         struct netmsg_base *clomsg = &msg->base;
1716         struct socket *so = clomsg->nm_so;
1717         struct inpcb *inp = so->so_pcb;
1718         struct thread *td = curthread;
1719         int nextcpu, cpuid = mycpuid;
1720
1721         KASSERT(td->td_type == TD_TYPE_NETISR, ("not in netisr"));
1722
1723         if (inp->inp_flags & INP_WILDCARD) {
1724                 /*
1725                  * This inp will be removed on the inp's
1726                  * owner CPU later, so don't do it now.
1727                  */
1728                 if (&td->td_msgport != so->so_port)
1729                         in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpuid]);
1730         }
1731
1732         if (cpuid == 0) {
1733                 /*
1734                  * Free and clear multicast socket option,
1735                  * which is only accessed in netisr0.
1736                  */
1737                 ip_freemoptions(inp->inp_moptions);
1738                 inp->inp_moptions = NULL;
1739         }
1740
1741         nextcpu = cpuid + 1;
1742         if (nextcpu < ncpus2) {
1743                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &clomsg->lmsg);
1744         } else {
1745                 /*
1746                  * No one could see this inpcb now; destroy this
1747                  * 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
1755 static void
1756 udp_detach_syncorig_dispatch(netmsg_t msg)
1757 {
1758         struct netmsg_base *clomsg = &msg->base;
1759         struct socket *so = clomsg->nm_so;
1760
1761         /*
1762          * Original protocol processing port is synchronized;
1763          * destroy this inpcb in its owner netisr.
1764          */
1765         netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1766             udp_detach_final_dispatch);
1767         lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1768 }
1769
1770 static void
1771 udp_detach(netmsg_t msg)
1772 {
1773         struct socket *so = msg->detach.base.nm_so;
1774         struct netmsg_base *clomsg;
1775         struct inpcb *inp;
1776
1777         inp = so->so_pcb;
1778         if (inp == NULL) {
1779                 lwkt_replymsg(&msg->detach.base.lmsg, EINVAL);
1780                 return;
1781         }
1782
1783         /*
1784          * Reply EJUSTRETURN ASAP, we will call sodiscard() and
1785          * sofree() later.
1786          */
1787         lwkt_replymsg(&msg->detach.base.lmsg, EJUSTRETURN);
1788
1789         if (ncpus2 == 1) {
1790                 /* Only one CPU, detach the inpcb directly. */
1791                 udp_detach2(so);
1792                 return;
1793         }
1794
1795         /*
1796          * Remove this inpcb from the inpcb list first, so that
1797          * no one could find this inpcb from the inpcb list.
1798          */
1799         in_pcbofflist(inp);
1800
1801         /*
1802          * Remove this inpcb from the local port hash directly
1803          * here, so that its bound local port could be recycled
1804          * timely.
1805          */
1806         in_pcbremporthash(inp);
1807
1808         if (inp->inp_flags & INP_DIRECT_DETACH) {
1809                 /*
1810                  * Direct detaching is allowed
1811                  */
1812                 KASSERT((inp->inp_flags & INP_WILDCARD) == 0,
1813                     ("in the wildcardhash"));
1814                 KASSERT(inp->inp_moptions == NULL, ("has mcast options"));
1815                 if (so->so_orig_port == NULL) {
1816                         udp_detach2(so);
1817                 } else {
1818                         /*
1819                          * Protocol processing port changed once, so
1820                          * we need to make sure that there are nothing
1821                          * left on the original protocol processing
1822                          * port before we destroy this socket and inpcb.
1823                          * This is more lightweight than going through
1824                          * all UDP processing netisrs.
1825                          */
1826                         clomsg = &so->so_clomsg;
1827                         netmsg_init(clomsg, so, &netisr_apanic_rport,
1828                             MSGF_IGNSOPORT, udp_detach_syncorig_dispatch);
1829                         lwkt_sendmsg(so->so_orig_port, &clomsg->lmsg);
1830                 }
1831                 return;
1832         }
1833
1834         /*
1835          * Go through netisrs which process UDP to make sure
1836          * no one could find this inpcb anymore.
1837          */
1838         clomsg = &so->so_clomsg;
1839         netmsg_init(clomsg, so, &netisr_apanic_rport, MSGF_IGNSOPORT,
1840             udp_detach_oncpu_dispatch);
1841         lwkt_sendmsg(netisr_cpuport(0), &clomsg->lmsg);
1842 }
1843
1844 static void
1845 udp_disconnect(netmsg_t msg)
1846 {
1847         struct socket *so = msg->disconnect.base.nm_so;
1848         struct inpcb *inp;
1849         boolean_t forwarded;
1850         int error = 0;
1851
1852         inp = so->so_pcb;
1853         if (inp == NULL) {
1854                 error = EINVAL;
1855                 goto out;
1856         }
1857         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1858                 error = ENOTCONN;
1859                 goto out;
1860         }
1861
1862         soclrstate(so, SS_ISCONNECTED);         /* XXX */
1863
1864         in_pcbdisconnect(inp);
1865         inp->inp_flags &= ~INP_HASH;
1866
1867         /*
1868          * Follow traditional BSD behavior and retain the local port
1869          * binding.  But, fix the old misbehavior of overwriting any
1870          * previously bound local address.
1871          */
1872         if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1873                 inp->inp_laddr.s_addr = INADDR_ANY;
1874
1875         if (so->so_state & SS_ISCLOSING) {
1876                 /*
1877                  * If this socket is being closed, there is no need
1878                  * to put this socket back into wildcard hash table.
1879                  */
1880                 error = 0;
1881                 goto out;
1882         }
1883
1884         forwarded = udp_inswildcardhash(inp, &msg->disconnect.base, 0);
1885         if (forwarded) {
1886                 /*
1887                  * The message is further forwarded, so we are done
1888                  * here.
1889                  */
1890                 return;
1891         }
1892 out:
1893         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1894 }
1895
1896 void
1897 udp_shutdown(netmsg_t msg)
1898 {
1899         struct socket *so = msg->shutdown.base.nm_so;
1900         struct inpcb *inp;
1901         int error;
1902
1903         inp = so->so_pcb;
1904         if (inp) {
1905                 socantsendmore(so);
1906                 error = 0;
1907         } else {
1908                 error = EINVAL;
1909         }
1910         lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1911 }
1912
1913 struct pr_usrreqs udp_usrreqs = {
1914         .pru_abort = udp_abort,
1915         .pru_accept = pr_generic_notsupp,
1916         .pru_attach = udp_attach,
1917         .pru_bind = udp_bind,
1918         .pru_connect = udp_connect,
1919         .pru_connect2 = pr_generic_notsupp,
1920         .pru_control = in_control_dispatch,
1921         .pru_detach = udp_detach,
1922         .pru_disconnect = udp_disconnect,
1923         .pru_listen = pr_generic_notsupp,
1924         .pru_peeraddr = in_setpeeraddr_dispatch,
1925         .pru_rcvd = pr_generic_notsupp,
1926         .pru_rcvoob = pr_generic_notsupp,
1927         .pru_send = udp_send,
1928         .pru_sense = pru_sense_null,
1929         .pru_shutdown = udp_shutdown,
1930         .pru_sockaddr = in_setsockaddr_dispatch,
1931         .pru_sosend = sosendudp,
1932         .pru_soreceive = soreceive,
1933         .pru_preconnect = udp_preconnect,
1934         .pru_preattach = udp_preattach
1935 };