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 #ifdef INET6
 189 struct udp_in6 {
 190         struct sockaddr_in6     uin6_sin;
 191         u_char                  uin6_init_done : 1;
 192 };
 193 struct udp_ip6 {
 194         struct ip6_hdr          uip6_ip6;
 195         u_char                  uip6_init_done : 1;
 196 };
 197 #else
 198 struct udp_in6;
 199 struct udp_ip6;
 200 #endif /* INET6 */
 201
 202 static void udp_append (struct inpcb *last, struct ip *ip,
 203     struct mbuf *n, int off, struct sockaddr_in *udp_in,
 204     struct udp_in6 *, struct udp_ip6 *);
 205 #ifdef INET6
 206 static void ip_2_ip6_hdr (struct ip6_hdr *ip6, struct ip *ip);
 207 #endif
 208
 209 static int udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
 210     struct sockaddr_in *if_sin);
 211
 212 static boolean_t udp_inswildcardhash(struct inpcb *inp,
 213     struct netmsg_base *msg, int error);
 214 static void udp_remwildcardhash(struct inpcb *inp);
 215
 216 void
 217 udp_init(void)
 218 {
 219         struct inpcbportinfo *portinfo;
 220         int cpu;
 221
 222         portinfo = kmalloc_cachealign(sizeof(*portinfo) * ncpus2, M_PCB,
 223             M_WAITOK);
 224
 225         for (cpu = 0; cpu < ncpus2; cpu++) {
 226                 struct inpcbinfo *uicb = &udbinfo[cpu];
 227
 228                 /*
 229                  * NOTE:
 230                  * UDP pcb list, wildcard hash table and localgroup hash
 231                  * table are shared.
 232                  */
 233                 in_pcbinfo_init(uicb, cpu, TRUE);
 234                 uicb->hashbase = hashinit(UDBHASHSIZE, M_PCB, &uicb->hashmask);
 235
 236                 in_pcbportinfo_init(&portinfo[cpu], UDBHASHSIZE, TRUE, cpu);
 237                 uicb->portinfo = portinfo;
 238                 uicb->portinfo_mask = ncpus2_mask;
 239
 240                 uicb->wildcardhashbase = hashinit(UDBHASHSIZE, M_PCB,
 241                     &uicb->wildcardhashmask);
 242                 uicb->localgrphashbase = hashinit(UDBHASHSIZE, M_PCB,
 243                     &uicb->localgrphashmask);
 244
 245                 uicb->ipi_size = sizeof(struct inpcb);
 246         }
 247
 248         /*
 249          * Initialize UDP statistics counters for each CPU.
 250          */
 251         for (cpu = 0; cpu < ncpus; ++cpu)
 252                 bzero(&udpstat_percpu[cpu], sizeof(struct udpstat));
 253 }
 254
 255 static int
 256 sysctl_udpstat(SYSCTL_HANDLER_ARGS)
 257 {
 258         int cpu, error = 0;
 259
 260         for (cpu = 0; cpu < ncpus; ++cpu) {
 261                 if ((error = SYSCTL_OUT(req, &udpstat_percpu[cpu],
 262                                         sizeof(struct udpstat))))
 263                         break;
 264                 if ((error = SYSCTL_IN(req, &udpstat_percpu[cpu],
 265                                        sizeof(struct udpstat))))
 266                         break;
 267         }
 268
 269         return (error);
 270 }
 271 SYSCTL_PROC(_net_inet_udp, UDPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
 272     0, 0, sysctl_udpstat, "S,udpstat", "UDP statistics");
 273
 274 void
 275 udp_ctloutput(netmsg_t msg)
 276 {
 277         struct socket *so = msg->base.nm_so;
 278         struct sockopt *sopt = msg->ctloutput.nm_sopt;
 279         struct  inpcb *inp = so->so_pcb;
 280
 281         if (sopt->sopt_level == IPPROTO_IP) {
 282                 switch (sopt->sopt_name) {
 283                 case IP_MULTICAST_IF:
 284                 case IP_MULTICAST_VIF:
 285                 case IP_MULTICAST_TTL:
 286                 case IP_MULTICAST_LOOP:
 287                 case IP_ADD_MEMBERSHIP:
 288                 case IP_DROP_MEMBERSHIP:
 289                         if (&curthread->td_msgport != netisr_cpuport(0)) {
 290                                 /*
 291                                  * This pr_ctloutput msg will be forwarded
 292                                  * to netisr0 to run; we can't do direct
 293                                  * detaching anymore.
 294                                  */
 295                                 inp->inp_flags &= ~INP_DIRECT_DETACH;
 296                         }
 297                         break;
 298                 }
 299         }
 300         return ip_ctloutput(msg);
 301 }
 302
 303 /*
 304  * Check multicast packets to make sure they are only sent to sockets with
 305  * multicast memberships for the packet's destination address and arrival
 306  * interface.  Multicast packets to multicast-unaware sockets are also
 307  * disallowed.
 308  *
 309  * Returns 0 if the packet is acceptable, -1 if it is not.
 310  */
 311 static __inline int
 312 check_multicast_membership(const struct ip *ip, const struct inpcb *inp,
 313     const struct mbuf *m)
 314 {
 315         const struct ip_moptions *mopt;
 316         int mshipno;
 317
 318         if (strict_mcast_mship == 0 ||
 319             !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 320                 return (0);
 321         }
 322
 323         KASSERT(&curthread->td_msgport == netisr_cpuport(0),
 324             ("multicast input not in netisr0"));
 325
 326         mopt = inp->inp_moptions;
 327         if (mopt == NULL)
 328                 return (-1);
 329         for (mshipno = 0; mshipno < mopt->imo_num_memberships; ++mshipno) {
 330                 const struct in_multi *maddr = mopt->imo_membership[mshipno];
 331
 332                 if (ip->ip_dst.s_addr == maddr->inm_addr.s_addr &&
 333                     m->m_pkthdr.rcvif == maddr->inm_ifp) {
 334                         return (0);
 335                 }
 336         }
 337         return (-1);
 338 }
 339
 340 struct udp_mcast_arg {
 341         struct inpcb    *inp;
 342         struct inpcb    *last;
 343         struct ip       *ip;
 344         struct mbuf     *m;
 345         int             iphlen;
 346         struct sockaddr_in *udp_in;
 347 #ifdef INET6
 348         struct udp_in6  *udp_in6;
 349         struct udp_ip6  *udp_ip6;
 350 #endif
 351 };
 352
 353 static int
 354 udp_mcast_input(struct udp_mcast_arg *arg)
 355 {
 356         struct inpcb *inp = arg->inp;
 357         struct inpcb *last = arg->last;
 358         struct ip *ip = arg->ip;
 359         struct mbuf *m = arg->m;
 360
 361         if (check_multicast_membership(ip, inp, m) < 0)
 362                 return ERESTART; /* caller continue */
 363
 364         if (last != NULL) {
 365                 struct mbuf *n;
 366
 367 #ifdef IPSEC
 368                 /* check AH/ESP integrity. */
 369                 if (ipsec4_in_reject_so(m, last->inp_socket))
 370                         ipsecstat.in_polvio++;
 371                         /* do not inject data to pcb */
 372                 else
 373 #endif /*IPSEC*/
 374 #ifdef FAST_IPSEC
 375                 /* check AH/ESP integrity. */
 376                 if (ipsec4_in_reject(m, last))
 377                         ;
 378                 else
 379 #endif /*FAST_IPSEC*/
 380                 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL)
 381                         udp_append(last, ip, n,
 382                             arg->iphlen + sizeof(struct udphdr),
 383                             arg->udp_in,
 384 #ifdef INET6
 385                             arg->udp_in6, arg->udp_ip6
 386 #else
 387                             NULL, NULL
 388 #endif
 389                             );
 390         }
 391         arg->last = last = inp;
 392
 393         /*
 394          * Don't look for additional matches if this one does
 395          * not have either the SO_REUSEPORT or SO_REUSEADDR
 396          * socket options set.  This heuristic avoids searching
 397          * through all pcbs in the common case of a non-shared
 398          * port.  It * assumes that an application will never
 399          * clear these options after setting them.
 400          */
 401         if (!(last->inp_socket->so_options &
 402             (SO_REUSEPORT | SO_REUSEADDR)))
 403                 return EJUSTRETURN; /* caller stop */
 404         return 0;
 405 }
 406
 407 int
 408 udp_input(struct mbuf **mp, int *offp, int proto)
 409 {
 410         struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
 411 #ifdef INET6
 412         struct udp_in6 udp_in6 = {
 413                 { sizeof udp_in6.uin6_sin, AF_INET6 }, 0
 414         };
 415         struct udp_ip6 udp_ip6;
 416 #endif
 417
 418         int iphlen;
 419         struct ip *ip;
 420         struct udphdr *uh;
 421         struct inpcb *inp;
 422         struct mbuf *m;
 423         struct mbuf *opts = NULL;
 424         int len, off;
 425         struct ip save_ip;
 426         struct sockaddr *append_sa;
 427         struct inpcbinfo *pcbinfo = &udbinfo[mycpuid];
 428
 429         off = *offp;
 430         m = *mp;
 431         *mp = NULL;
 432
 433         iphlen = off;
 434         udp_stat.udps_ipackets++;
 435
 436         /*
 437          * Strip IP options, if any; should skip this,
 438          * make available to user, and use on returned packets,
 439          * but we don't yet have a way to check the checksum
 440          * with options still present.
 441          */
 442         if (iphlen > sizeof(struct ip)) {
 443                 ip_stripoptions(m);
 444                 iphlen = sizeof(struct ip);
 445         }
 446
 447         /*
 448          * IP and UDP headers are together in first mbuf.
 449          * Already checked and pulled up in ip_demux().
 450          */
 451         KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
 452             ("UDP header not in one mbuf"));
 453
 454         ip = mtod(m, struct ip *);
 455         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 456
 457         /* destination port of 0 is illegal, based on RFC768. */
 458         if (uh->uh_dport == 0)
 459                 goto bad;
 460
 461         /*
 462          * Make mbuf data length reflect UDP length.
 463          * If not enough data to reflect UDP length, drop.
 464          */
 465         len = ntohs((u_short)uh->uh_ulen);
 466         if (ip->ip_len != len) {
 467                 if (len > ip->ip_len || len < sizeof(struct udphdr)) {
 468                         udp_stat.udps_badlen++;
 469                         goto bad;
 470                 }
 471                 m_adj(m, len - ip->ip_len);
 472                 /* ip->ip_len = len; */
 473         }
 474         /*
 475          * Save a copy of the IP header in case we want restore it
 476          * for sending an ICMP error message in response.
 477          */
 478         save_ip = *ip;
 479
 480         /*
 481          * Checksum extended UDP header and data.
 482          */
 483         if (uh->uh_sum) {
 484                 if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
 485                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 486                                 uh->uh_sum = m->m_pkthdr.csum_data;
 487                         else
 488                                 uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
 489                                     ip->ip_dst.s_addr, htonl((u_short)len +
 490                                     m->m_pkthdr.csum_data + IPPROTO_UDP));
 491                         uh->uh_sum ^= 0xffff;
 492                 } else {
 493                         char b[9];
 494
 495                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 496                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 497                         ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
 498                         uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
 499                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 500                 }
 501                 if (uh->uh_sum) {
 502                         udp_stat.udps_badsum++;
 503                         m_freem(m);
 504                         return(IPPROTO_DONE);
 505                 }
 506         } else
 507                 udp_stat.udps_nosum++;
 508
 509         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 510             in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
 511                 struct inpcbhead *connhead;
 512                 struct inpcontainer *ic, *ic_marker;
 513                 struct inpcontainerhead *ichead;
 514                 struct udp_mcast_arg arg;
 515                 struct inpcb *last;
 516                 int error;
 517
 518                 /*
 519                  * Deliver a multicast or broadcast datagram to *all* sockets
 520                  * for which the local and remote addresses and ports match
 521                  * those of the incoming datagram.  This allows more than
 522                  * one process to receive multi/broadcasts on the same port.
 523                  * (This really ought to be done for unicast datagrams as
 524                  * well, but that would cause problems with existing
 525                  * applications that open both address-specific sockets and
 526                  * a wildcard socket listening to the same port -- they would
 527                  * end up receiving duplicates of every unicast datagram.
 528                  * Those applications open the multiple sockets to overcome an
 529                  * inadequacy of the UDP socket interface, but for backwards
 530                  * compatibility we avoid the problem here rather than
 531                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 532                  */
 533
 534                 /*
 535                  * Construct sockaddr format source address.
 536                  */
 537                 udp_in.sin_port = uh->uh_sport;
 538                 udp_in.sin_addr = ip->ip_src;
 539                 arg.udp_in = &udp_in;
 540                 /*
 541                  * Locate pcb(s) for datagram.
 542                  * (Algorithm copied from raw_intr().)
 543                  */
 544                 last = NULL;
 545 #ifdef INET6
 546                 udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0;
 547                 arg.udp_in6 = &udp_in6;
 548                 arg.udp_ip6 = &udp_ip6;
 549 #endif
 550                 arg.iphlen = iphlen;
 551
 552                 connhead = &pcbinfo->hashbase[
 553                     INP_PCBCONNHASH(ip->ip_src.s_addr, uh->uh_sport,
 554                     ip->ip_dst.s_addr, uh->uh_dport, pcbinfo->hashmask)];
 555                 LIST_FOREACH(inp, connhead, inp_hash) {
 556 #ifdef INET6
 557                         if (!(inp->inp_vflag & INP_IPV4))
 558                                 continue;
 559 #endif
 560                         if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
 561                             !in_hosteq(inp->inp_laddr, ip->ip_dst) ||
 562                             inp->inp_fport != uh->uh_sport ||
 563                             inp->inp_lport != uh->uh_dport)
 564                                 continue;
 565
 566                         arg.inp = inp;
 567                         arg.last = last;
 568                         arg.ip = ip;
 569                         arg.m = m;
 570
 571                         error = udp_mcast_input(&arg);
 572                         if (error == ERESTART)
 573                                 continue;
 574                         last = arg.last;
 575
 576                         if (error == EJUSTRETURN)
 577                                 goto done;
 578                 }
 579
 580                 ichead = &pcbinfo->wildcardhashbase[
 581                     INP_PCBWILDCARDHASH(uh->uh_dport,
 582                     pcbinfo->wildcardhashmask)];
 583                 ic_marker = in_pcbcontainer_marker(mycpuid);
 584
 585                 GET_PCBINFO_TOKEN(pcbinfo);
 586                 LIST_INSERT_HEAD(ichead, ic_marker, ic_list);
 587                 while ((ic = LIST_NEXT(ic_marker, ic_list)) != NULL) {
 588                         LIST_REMOVE(ic_marker, ic_list);
 589                         LIST_INSERT_AFTER(ic, ic_marker, ic_list);
 590
 591                         inp = ic->ic_inp;
 592                         if (inp->inp_flags & INP_PLACEMARKER)
 593                                 continue;
 594 #ifdef INET6
 595                         if (!(inp->inp_vflag & INP_IPV4))
 596                                 continue;
 597 #endif
 598                         if (inp->inp_lport != uh->uh_dport)
 599                                 continue;
 600                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 601                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 602                                 continue;
 603
 604                         arg.inp = inp;
 605                         arg.last = last;
 606                         arg.ip = ip;
 607                         arg.m = m;
 608
 609                         error = udp_mcast_input(&arg);
 610                         if (error == ERESTART)
 611                                 continue;
 612                         last = arg.last;
 613
 614                         if (error == EJUSTRETURN)
 615                                 break;
 616                 }
 617                 LIST_REMOVE(ic_marker, ic_list);
 618                 REL_PCBINFO_TOKEN(pcbinfo);
 619 done:
 620                 if (last == NULL) {
 621                         /*
 622                          * No matching pcb found; discard datagram.
 623                          * (No need to send an ICMP Port Unreachable
 624                          * for a broadcast or multicast datgram.)
 625                          */
 626                         udp_stat.udps_noportbcast++;
 627                         goto bad;
 628                 }
 629 #ifdef IPSEC
 630                 /* check AH/ESP integrity. */
 631                 if (ipsec4_in_reject_so(m, last->inp_socket)) {
 632                         ipsecstat.in_polvio++;
 633                         goto bad;
 634                 }
 635 #endif /*IPSEC*/
 636 #ifdef FAST_IPSEC
 637                 /* check AH/ESP integrity. */
 638                 if (ipsec4_in_reject(m, last))
 639                         goto bad;
 640 #endif /*FAST_IPSEC*/
 641                 udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
 642                     &udp_in,
 643 #ifdef INET6
 644                     &udp_in6, &udp_ip6
 645 #else
 646                     NULL, NULL
 647 #endif
 648                     );
 649                 return(IPPROTO_DONE);
 650         }
 651         /*
 652          * Locate pcb for datagram.
 653          */
 654         inp = in_pcblookup_pkthash(pcbinfo, ip->ip_src, uh->uh_sport,
 655             ip->ip_dst, uh->uh_dport, TRUE, m->m_pkthdr.rcvif,
 656             udp_reuseport_ext ? m : NULL);
 657         if (inp == NULL) {
 658                 if (log_in_vain) {
 659                         char buf[sizeof "aaa.bbb.ccc.ddd"];
 660
 661                         strcpy(buf, inet_ntoa(ip->ip_dst));
 662                         log(LOG_INFO,
 663                             "Connection attempt to UDP %s:%d from %s:%d\n",
 664                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 665                             ntohs(uh->uh_sport));
 666                 }
 667                 udp_stat.udps_noport++;
 668                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 669                         udp_stat.udps_noportbcast++;
 670                         goto bad;
 671                 }
 672                 if (blackhole)
 673                         goto bad;
 674 #ifdef ICMP_BANDLIM
 675                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 676                         goto bad;
 677 #endif
 678                 *ip = save_ip;
 679                 ip->ip_len += iphlen;
 680                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 681                 return(IPPROTO_DONE);
 682         }
 683 #ifdef IPSEC
 684         if (ipsec4_in_reject_so(m, inp->inp_socket)) {
 685                 ipsecstat.in_polvio++;
 686                 goto bad;
 687         }
 688 #endif /*IPSEC*/
 689 #ifdef FAST_IPSEC
 690         if (ipsec4_in_reject(m, inp))
 691                 goto bad;
 692 #endif /*FAST_IPSEC*/
 693         /*
 694          * Check the minimum TTL for socket.
 695          */
 696         if (ip->ip_ttl < inp->inp_ip_minttl)
 697                 goto bad;
 698
 699         /*
 700          * Construct sockaddr format source address.
 701          * Stuff source address and datagram in user buffer.
 702          */
 703         udp_in.sin_port = uh->uh_sport;
 704         udp_in.sin_addr = ip->ip_src;
 705         if ((inp->inp_flags & INP_CONTROLOPTS) ||
 706             (inp->inp_socket->so_options & SO_TIMESTAMP)) {
 707 #ifdef INET6
 708                 if (inp->inp_vflag & INP_IPV6) {
 709                         int savedflags;
 710
 711                         ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip);
 712                         savedflags = inp->inp_flags;
 713                         inp->inp_flags &= ~INP_UNMAPPABLEOPTS;
 714                         ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m);
 715                         inp->inp_flags = savedflags;
 716                 } else
 717 #endif
 718                 ip_savecontrol(inp, &opts, ip, m);
 719         }
 720         m_adj(m, iphlen + sizeof(struct udphdr));
 721 #ifdef INET6
 722         if (inp->inp_vflag & INP_IPV6) {
 723                 in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin);
 724                 append_sa = (struct sockaddr *)&udp_in6;
 725         } else
 726 #endif
 727                 append_sa = (struct sockaddr *)&udp_in;
 728
 729         lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
 730         if (ssb_appendaddr(&inp->inp_socket->so_rcv, append_sa, m, opts) == 0) {
 731                 lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 732                 udp_stat.udps_fullsock++;
 733                 goto bad;
 734         }
 735         lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
 736         sorwakeup(inp->inp_socket);
 737         return(IPPROTO_DONE);
 738 bad:
 739         m_freem(m);
 740         if (opts)
 741                 m_freem(opts);
 742         return(IPPROTO_DONE);
 743 }
 744
 745 #ifdef INET6
 746 static void
 747 ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip)
 748 {
 749         bzero(ip6, sizeof *ip6);
 750
 751         ip6->ip6_vfc = IPV6_VERSION;
 752         ip6->ip6_plen = ip->ip_len;
 753         ip6->ip6_nxt = ip->ip_p;
 754         ip6->ip6_hlim = ip->ip_ttl;
 755         ip6->ip6_src.s6_addr32[2] = ip6->ip6_dst.s6_addr32[2] =
 756                 IPV6_ADDR_INT32_SMP;
 757         ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr;
 758         ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr;
 759 }
 760 #endif
 761
 762 /*
 763  * subroutine of udp_input(), mainly for source code readability.
 764  * caller must properly init udp_ip6 and udp_in6 beforehand.
 765  */
 766 static void
 767 udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off,
 768     struct sockaddr_in *udp_in,
 769     struct udp_in6 *udp_in6, struct udp_ip6 *udp_ip6)
 770 {
 771         struct sockaddr *append_sa;
 772         struct mbuf *opts = NULL;
 773         int ret;
 774
 775         if (last->inp_flags & INP_CONTROLOPTS ||
 776             last->inp_socket->so_options & SO_TIMESTAMP) {
 777 #ifdef INET6
 778                 if (last->inp_vflag & INP_IPV6) {
 779                         int savedflags;
 780
 781                         if (udp_ip6->uip6_init_done == 0) {
 782                                 ip_2_ip6_hdr(&udp_ip6->uip6_ip6, ip);
 783                                 udp_ip6->uip6_init_done = 1;
 784                         }
 785                         savedflags = last->inp_flags;
 786                         last->inp_flags &= ~INP_UNMAPPABLEOPTS;
 787                         ip6_savecontrol(last, &opts, &udp_ip6->uip6_ip6, n);
 788                         last->inp_flags = savedflags;
 789                 } else
 790 #endif
 791                 ip_savecontrol(last, &opts, ip, n);
 792         }
 793 #ifdef INET6
 794         if (last->inp_vflag & INP_IPV6) {
 795                 if (udp_in6->uin6_init_done == 0) {
 796                         in6_sin_2_v4mapsin6(udp_in, &udp_in6->uin6_sin);
 797                         udp_in6->uin6_init_done = 1;
 798                 }
 799                 append_sa = (struct sockaddr *)&udp_in6->uin6_sin;
 800         } else
 801 #endif
 802                 append_sa = (struct sockaddr *)udp_in;
 803         m_adj(n, off);
 804
 805         lwkt_gettoken(&last->inp_socket->so_rcv.ssb_token);
 806         ret = ssb_appendaddr(&last->inp_socket->so_rcv, append_sa, n, opts);
 807         lwkt_reltoken(&last->inp_socket->so_rcv.ssb_token);
 808         if (ret == 0) {
 809                 m_freem(n);
 810                 if (opts)
 811                         m_freem(opts);
 812                 udp_stat.udps_fullsock++;
 813         } else {
 814                 sorwakeup(last->inp_socket);
 815         }
 816 }
 817
 818 /*
 819  * Notify a udp user of an asynchronous error;
 820  * just wake up so that he can collect error status.
 821  */
 822 void
 823 udp_notify(struct inpcb *inp, int error)
 824 {
 825         inp->inp_socket->so_error = error;
 826         sorwakeup(inp->inp_socket);
 827         sowwakeup(inp->inp_socket);
 828 }
 829
 830 struct netmsg_udp_notify {
 831         struct netmsg_base base;
 832         inp_notify_t    nm_notify;
 833         struct in_addr  nm_faddr;
 834         int             nm_arg;
 835 };
 836
 837 static void
 838 udp_notifyall_oncpu(netmsg_t msg)
 839 {
 840         struct netmsg_udp_notify *nm = (struct netmsg_udp_notify *)msg;
 841         int nextcpu, cpu = mycpuid;
 842
 843         in_pcbnotifyall(&udbinfo[cpu], nm->nm_faddr, nm->nm_arg, nm->nm_notify);
 844
 845         nextcpu = cpu + 1;
 846         if (nextcpu < ncpus2)
 847                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg);
 848         else
 849                 lwkt_replymsg(&nm->base.lmsg, 0);
 850 }
 851
 852 inp_notify_t
 853 udp_get_inpnotify(int cmd, const struct sockaddr *sa,
 854     struct ip **ip0, int *cpuid)
 855 {
 856         struct in_addr faddr;
 857         struct ip *ip = *ip0;
 858         inp_notify_t notify = udp_notify;
 859
 860         faddr = ((const struct sockaddr_in *)sa)->sin_addr;
 861         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 862                 return NULL;
 863
 864         if (PRC_IS_REDIRECT(cmd)) {
 865                 ip = NULL;
 866                 notify = in_rtchange;
 867         } else if (cmd == PRC_HOSTDEAD) {
 868                 ip = NULL;
 869         } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) {
 870                 return NULL;
 871         }
 872
 873         if (cpuid != NULL) {
 874                 if (ip == NULL) {
 875                         /* Go through all CPUs */
 876                         *cpuid = ncpus;
 877                 } else {
 878                         const struct udphdr *uh;
 879
 880                         uh = (const struct udphdr *)
 881                             ((caddr_t)ip + (ip->ip_hl << 2));
 882                         *cpuid = udp_addrcpu(faddr.s_addr, uh->uh_dport,
 883                             ip->ip_src.s_addr, uh->uh_sport);
 884                 }
 885         }
 886
 887         *ip0 = ip;
 888         return notify;
 889 }
 890
 891 void
 892 udp_ctlinput(netmsg_t msg)
 893 {
 894         struct sockaddr *sa = msg->ctlinput.nm_arg;
 895         struct ip *ip = msg->ctlinput.nm_extra;
 896         int cmd = msg->ctlinput.nm_cmd, cpuid;
 897         inp_notify_t notify;
 898         struct in_addr faddr;
 899
 900         notify = udp_get_inpnotify(cmd, sa, &ip, &cpuid);
 901         if (notify == NULL)
 902                 goto done;
 903
 904         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 905         if (ip) {
 906                 const struct udphdr *uh;
 907                 struct inpcb *inp;
 908
 909                 if (cpuid != mycpuid)
 910                         goto done;
 911
 912                 uh = (const struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 913                 inp = in_pcblookup_hash(&udbinfo[mycpuid], faddr, uh->uh_dport,
 914                                         ip->ip_src, uh->uh_sport, 0, NULL);
 915                 if (inp != NULL && inp->inp_socket != NULL)
 916                         notify(inp, inetctlerrmap[cmd]);
 917         } else if (msg->ctlinput.nm_direct) {
 918                 if (cpuid != ncpus && cpuid != mycpuid)
 919                         goto done;
 920                 if (mycpuid >= ncpus2)
 921                         goto done;
 922
 923                 in_pcbnotifyall(&udbinfo[mycpuid], faddr, inetctlerrmap[cmd],
 924                     notify);
 925         } else {
 926                 struct netmsg_udp_notify *nm;
 927
 928                 KKASSERT(&curthread->td_msgport == netisr_cpuport(0));
 929                 nm = kmalloc(sizeof(*nm), M_LWKTMSG, M_INTWAIT);
 930                 netmsg_init(&nm->base, NULL, &netisr_afree_rport,
 931                             0, udp_notifyall_oncpu);
 932                 nm->nm_faddr = faddr;
 933                 nm->nm_arg = inetctlerrmap[cmd];
 934                 nm->nm_notify = notify;
 935                 lwkt_sendmsg(netisr_cpuport(0), &nm->base.lmsg);
 936         }
 937 done:
 938         lwkt_replymsg(&msg->lmsg, 0);
 939 }
 940
 941 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, udbinfo, 0,
 942             in_pcblist_global_ncpus2, "S,xinpcb", "List of active UDP sockets");
 943
 944 static int
 945 udp_getcred(SYSCTL_HANDLER_ARGS)
 946 {
 947         struct sockaddr_in addrs[2];
 948         struct ucred cred0, *cred = NULL;
 949         struct inpcb *inp;
 950         int error, cpu, origcpu;
 951
 952         error = priv_check(req->td, PRIV_ROOT);
 953         if (error)
 954                 return (error);
 955         error = SYSCTL_IN(req, addrs, sizeof addrs);
 956         if (error)
 957                 return (error);
 958
 959         origcpu = mycpuid;
 960         cpu = udp_addrcpu(addrs[1].sin_addr.s_addr, addrs[1].sin_port,
 961             addrs[0].sin_addr.s_addr, addrs[0].sin_port);
 962
 963         lwkt_migratecpu(cpu);
 964
 965         inp = in_pcblookup_hash(&udbinfo[cpu],
 966             addrs[1].sin_addr, addrs[1].sin_port,
 967             addrs[0].sin_addr, addrs[0].sin_port, TRUE, NULL);
 968         if (inp == NULL || inp->inp_socket == NULL) {
 969                 error = ENOENT;
 970         } else if (inp->inp_socket->so_cred != NULL) {
 971                 cred0 = *(inp->inp_socket->so_cred);
 972                 cred = &cred0;
 973         }
 974
 975         lwkt_migratecpu(origcpu);
 976
 977         if (error)
 978                 return error;
 979
 980         return SYSCTL_OUT(req, cred, sizeof(struct ucred));
 981 }
 982 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 983     0, 0, udp_getcred, "S,ucred", "Get the ucred of a UDP connection");
 984
 985 static void
 986 udp_send_redispatch(netmsg_t msg)
 987 {
 988         struct mbuf *m = msg->send.nm_m;
 989         int pru_flags = msg->send.nm_flags;
 990         struct inpcb *inp = msg->send.base.nm_so->so_pcb;
 991         struct mbuf *m_opt = msg->send.nm_control; /* XXX save ipopt */
 992         int flags = msg->send.nm_priv; /* ip_output flags */
 993         int error;
 994
 995         logudp(redisp_ipout_beg, inp);
 996
 997         /*
 998          * - Don't use inp route cache.  It should only be used in the
 999          *   inp owner netisr.
1000          * - Access to inp_moptions should be safe, since multicast UDP
1001          *   datagrams are redispatched to netisr0 and inp_moptions is
1002          *   changed only in netisr0.
1003          */
1004         error = ip_output(m, m_opt, NULL, flags, inp->inp_moptions, inp);
1005         if ((pru_flags & PRUS_NOREPLY) == 0)
1006                 lwkt_replymsg(&msg->send.base.lmsg, error);
1007
1008         if (m_opt != NULL) {
1009                 /* Free saved ip options, if any */
1010                 m_freem(m_opt);
1011         }
1012
1013         logudp(redisp_ipout_end, inp);
1014 }
1015
1016 static void
1017 udp_send(netmsg_t msg)
1018 {
1019         struct socket *so = msg->send.base.nm_so;
1020         struct mbuf *m = msg->send.nm_m;
1021         struct sockaddr *dstaddr = msg->send.nm_addr;
1022         int pru_flags = msg->send.nm_flags;
1023         struct inpcb *inp = so->so_pcb;
1024         struct thread *td = msg->send.nm_td;
1025         int flags;
1026
1027         struct udpiphdr *ui;
1028         int len = m->m_pkthdr.len;
1029         struct sockaddr_in *sin;        /* really is initialized before use */
1030         int error = 0, cpu;
1031
1032         KKASSERT(msg->send.nm_control == NULL);
1033
1034         logudp(send_beg, inp);
1035
1036         if (inp == NULL) {
1037                 error = EINVAL;
1038                 goto release;
1039         }
1040
1041         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1042                 error = EMSGSIZE;
1043                 goto release;
1044         }
1045
1046         if (inp->inp_lport == 0) {      /* unbound socket */
1047                 boolean_t forwarded;
1048
1049                 error = in_pcbbind(inp, NULL, td);
1050                 if (error)
1051                         goto release;
1052
1053                 /*
1054                  * Need to call udp_send again, after this inpcb is
1055                  * inserted into wildcard hash table.
1056                  */
1057                 msg->send.base.lmsg.ms_flags |= MSGF_UDP_SEND;
1058                 forwarded = udp_inswildcardhash(inp, &msg->send.base, 0);
1059                 if (forwarded) {
1060                         /*
1061                          * The message is further forwarded, so we are
1062                          * done here.
1063                          */
1064                         logudp(send_inswildcard, inp);
1065                         return;
1066                 }
1067         }
1068
1069         if (dstaddr != NULL) {          /* destination address specified */
1070                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1071                         /* already connected */
1072                         error = EISCONN;
1073                         goto release;
1074                 }
1075                 sin = (struct sockaddr_in *)dstaddr;
1076                 if (!prison_remote_ip(td, (struct sockaddr *)&sin)) {
1077                         error = EAFNOSUPPORT; /* IPv6 only jail */
1078                         goto release;
1079                 }
1080         } else {
1081                 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1082                         /* no destination specified and not already connected */
1083                         error = ENOTCONN;
1084                         goto release;
1085                 }
1086                 sin = NULL;
1087         }
1088
1089         /*
1090          * Calculate data length and get a mbuf
1091          * for UDP and IP headers.
1092          */
1093         M_PREPEND(m, sizeof(struct udpiphdr), MB_DONTWAIT);
1094         if (m == NULL) {
1095                 error = ENOBUFS;
1096                 goto release;
1097         }
1098
1099         /*
1100          * Fill in mbuf with extended UDP header
1101          * and addresses and length put into network format.
1102          */
1103         ui = mtod(m, struct udpiphdr *);
1104         bzero(ui->ui_x1, sizeof ui->ui_x1);     /* XXX still needed? */
1105         ui->ui_pr = IPPROTO_UDP;
1106
1107         /*
1108          * Set destination address.
1109          */
1110         if (dstaddr != NULL) {                  /* use specified destination */
1111                 ui->ui_dst = sin->sin_addr;
1112                 ui->ui_dport = sin->sin_port;
1113         } else {                                /* use connected destination */
1114                 ui->ui_dst = inp->inp_faddr;
1115                 ui->ui_dport = inp->inp_fport;
1116         }
1117
1118         /*
1119          * Set source address.
1120          */
1121         if (inp->inp_laddr.s_addr == INADDR_ANY ||
1122             IN_MULTICAST(ntohl(inp->inp_laddr.s_addr))) {
1123                 struct sockaddr_in *if_sin;
1124
1125                 if (dstaddr == NULL) {
1126                         /*
1127                          * connect() had (or should have) failed because
1128                          * the interface had no IP address, but the
1129                          * application proceeded to call send() anyways.
1130                          */
1131                         error = ENOTCONN;
1132                         goto release;
1133                 }
1134
1135                 /* Look up outgoing interface. */
1136                 error = in_pcbladdr_find(inp, dstaddr, &if_sin, td, 1);
1137                 if (error)
1138                         goto release;
1139                 ui->ui_src = if_sin->sin_addr;  /* use address of interface */
1140         } else {
1141                 ui->ui_src = inp->inp_laddr;    /* use non-null bound address */
1142         }
1143         ui->ui_sport = inp->inp_lport;
1144         KASSERT(inp->inp_lport != 0, ("inp lport should have been bound"));
1145
1146         /*
1147          * Release the original thread, since it is no longer used
1148          */
1149         if (pru_flags & PRUS_HELDTD) {
1150                 lwkt_rele(td);
1151                 pru_flags &= ~PRUS_HELDTD;
1152         }
1153         /*
1154          * Free the dest address, since it is no longer needed
1155          */
1156         if (pru_flags & PRUS_FREEADDR) {
1157                 kfree(dstaddr, M_SONAME);
1158                 pru_flags &= ~PRUS_FREEADDR;
1159         }
1160
1161         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1162
1163         /*
1164          * Set up checksum and output datagram.
1165          */
1166         if (udpcksum) {
1167                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr,
1168                     htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP));
1169                 m->m_pkthdr.csum_flags = CSUM_UDP;
1170                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1171                 m->m_pkthdr.csum_thlen = sizeof(struct udphdr);
1172         } else {
1173                 ui->ui_sum = 0;
1174         }
1175         ((struct ip *)ui)->ip_len = sizeof(struct udpiphdr) + len;
1176         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1177         ((struct ip *)ui)->ip_tos = inp->inp_ip_tos;    /* XXX */
1178         udp_stat.udps_opackets++;
1179
1180         flags = IP_DEBUGROUTE |
1181             (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
1182         if (pru_flags & PRUS_DONTROUTE)
1183                 flags |= SO_DONTROUTE;
1184
1185         if (inp->inp_flags & INP_CONNECTED) {
1186                 /*
1187                  * For connected socket, this datagram has already
1188                  * been in the correct netisr; no need to rehash.
1189                  */
1190                 goto sendit;
1191         }
1192
1193         cpu = udp_addrcpu(ui->ui_dst.s_addr, ui->ui_dport,
1194             ui->ui_src.s_addr, ui->ui_sport);
1195         if (cpu != mycpuid) {
1196                 struct mbuf *m_opt = NULL;
1197                 struct netmsg_pru_send *smsg;
1198                 struct lwkt_port *port = netisr_cpuport(cpu);
1199
1200                 /*
1201                  * Not on the CPU that matches this UDP datagram hash;
1202                  * redispatch to the correct CPU to do the ip_output().
1203                  */
1204                 if (inp->inp_options != NULL) {
1205                         /*
1206                          * If there are ip options, then save a copy,
1207                          * since accessing inp_options on other CPUs'
1208                          * is not safe.
1209                          *
1210                          * XXX optimize this?
1211                          */
1212                         m_opt = m_copym(inp->inp_options, 0, M_COPYALL,
1213                             MB_WAIT);
1214                 }
1215                 if ((pru_flags & PRUS_NOREPLY) == 0) {
1216                         /*
1217                          * Change some parts of the original netmsg and
1218                          * forward it to the target netisr.
1219                          *
1220                          * NOTE: so_port MUST NOT be checked in the target
1221                          * netisr.
1222                          */
1223                         smsg = &msg->send;
1224                         smsg->nm_priv = flags; /* ip_output flags */
1225                         smsg->nm_m = m;
1226                         smsg->nm_control = m_opt; /* XXX save ipopt */
1227                         smsg->base.lmsg.ms_flags |= MSGF_IGNSOPORT;
1228                         smsg->base.nm_dispatch = udp_send_redispatch;
1229                         lwkt_forwardmsg(port, &smsg->base.lmsg);
1230                 } else {
1231                         /*
1232                          * Recreate the netmsg, since the original mbuf
1233                          * could have been changed.  And send it to the
1234                          * target netisr.
1235                          *
1236                          * NOTE: so_port MUST NOT be checked in the target
1237                          * netisr.
1238                          */
1239                         smsg = &m->m_hdr.mh_sndmsg;
1240                         netmsg_init(&smsg->base, so, &netisr_apanic_rport,
1241                             MSGF_IGNSOPORT, udp_send_redispatch);
1242                         smsg->nm_priv = flags; /* ip_output flags */
1243                         smsg->nm_flags = pru_flags;
1244                         smsg->nm_m = m;
1245                         smsg->nm_control = m_opt; /* XXX save ipopt */
1246                         lwkt_sendmsg(port, &smsg->base.lmsg);
1247                 }
1248
1249                 /* This UDP datagram is redispatched; done */
1250                 logudp(send_redisp, inp);
1251                 return;
1252         }
1253
1254 sendit:
1255         logudp(send_ipout, inp);
1256         error = ip_output(m, inp->inp_options, &inp->inp_route, flags,
1257             inp->inp_moptions, inp);
1258         m = NULL;
1259
1260 release:
1261         if (m != NULL)
1262                 m_freem(m);
1263
1264         if (pru_flags & PRUS_HELDTD)
1265                 lwkt_rele(td);
1266         if (pru_flags & PRUS_FREEADDR)
1267                 kfree(dstaddr, M_SONAME);
1268         if ((pru_flags & PRUS_NOREPLY) == 0)
1269                 lwkt_replymsg(&msg->send.base.lmsg, error);
1270
1271         logudp(send_end, inp);
1272 }
1273
1274 u_long  udp_sendspace = 9216;           /* really max datagram size */
1275                                         /* 40 1K datagrams */
1276 SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
1277     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
1278
1279 u_long  udp_recvspace = 40 * (1024 +
1280 #ifdef INET6
1281                                       sizeof(struct sockaddr_in6)
1282 #else
1283                                       sizeof(struct sockaddr_in)
1284 #endif
1285                                       );
1286 SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1287     &udp_recvspace, 0, "Maximum incoming UDP datagram size");
1288
1289 /*
1290  * This should never happen, since UDP socket does not support
1291  * connection acception (SO_ACCEPTCONN, i.e. listen(2)).
1292  */
1293 static void
1294 udp_abort(netmsg_t msg __unused)
1295 {
1296         panic("udp_abort is called");
1297 }
1298
1299 static void
1300 udp_attach(netmsg_t msg)
1301 {
1302         struct socket *so = msg->attach.base.nm_so;
1303         struct pru_attach_info *ai = msg->attach.nm_ai;
1304         struct inpcb *inp;
1305         int error;
1306
1307         inp = so->so_pcb;
1308         if (inp != NULL) {
1309                 error = EINVAL;
1310                 goto out;
1311         }
1312         error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit);
1313         if (error)
1314                 goto out;
1315
1316         error = in_pcballoc(so, &udbinfo[mycpuid]);
1317         if (error)
1318                 goto out;
1319
1320         inp = (struct inpcb *)so->so_pcb;
1321         inp->inp_flags |= INP_DIRECT_DETACH;
1322         inp->inp_vflag |= INP_IPV4;
1323         inp->inp_ip_ttl = ip_defttl;
1324         error = 0;
1325 out:
1326         lwkt_replymsg(&msg->attach.base.lmsg, error);
1327 }
1328
1329 static void
1330 udp_inswildcard_replymsg(netmsg_t msg)
1331 {
1332         lwkt_msg_t lmsg = &msg->lmsg;
1333
1334         if (lmsg->ms_flags & MSGF_UDP_SEND) {
1335                 udp_send(msg);
1336                 /* msg is replied by udp_send() */
1337         } else {
1338                 lwkt_replymsg(lmsg, lmsg->ms_error);
1339         }
1340 }
1341
1342 static void
1343 udp_soreuseport_dispatch(netmsg_t msg)
1344 {
1345         /* This inpcb has already been in the wildcard hash. */
1346         in_pcblink_flags(msg->base.nm_so->so_pcb, &udbinfo[mycpuid], 0);
1347         udp_inswildcard_replymsg(msg);
1348 }
1349
1350 static void
1351 udp_sosetport(struct lwkt_msg *msg, lwkt_port_t port)
1352 {
1353         sosetport(((struct netmsg_base *)msg)->nm_so, port);
1354 }
1355
1356 static boolean_t
1357 udp_inswildcardhash_oncpu(struct inpcb *inp, struct netmsg_base *msg)
1358 {
1359         int cpu;
1360
1361         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1362             ("not on owner cpu"));
1363
1364         in_pcbinswildcardhash(inp);
1365         for (cpu = 0; cpu < ncpus2; ++cpu) {
1366                 if (cpu == mycpuid) {
1367                         /*
1368                          * This inpcb has been inserted by the above
1369                          * in_pcbinswildcardhash().
1370                          */
1371                         continue;
1372                 }
1373                 in_pcbinswildcardhash_oncpu(inp, &udbinfo[cpu]);
1374         }
1375
1376         if (inp->inp_socket->so_options & SO_REUSEPORT) {
1377                 /*
1378                  * For SO_REUSEPORT socket, redistribute it based on its
1379                  * local group index.
1380                  */
1381                 cpu = inp->inp_lgrpindex & ncpus2_mask;
1382                 if (cpu != mycpuid) {
1383                         struct lwkt_port *port = netisr_cpuport(cpu);
1384                         lwkt_msg_t lmsg = &msg->lmsg;
1385
1386                         /*
1387                          * We are moving the protocol processing port the
1388                          * socket is on, we have to unlink here and re-link
1389                          * on the target cpu (this inpcb is still left in
1390                          * the wildcard hash).
1391                          */
1392                         in_pcbunlink_flags(inp, &udbinfo[mycpuid], 0);
1393                         msg->nm_dispatch = udp_soreuseport_dispatch;
1394
1395                         /*
1396                          * See the related comment in tcp_usrreq.c
1397                          * tcp_connect()
1398                          */
1399                         lwkt_setmsg_receipt(lmsg, udp_sosetport);
1400                         lwkt_forwardmsg(port, lmsg);
1401                         return TRUE; /* forwarded */
1402                 }
1403         }
1404         return FALSE;
1405 }
1406
1407 static void
1408 udp_inswildcardhash_dispatch(netmsg_t msg)
1409 {
1410         struct inpcb *inp = msg->base.nm_so->so_pcb;
1411         boolean_t forwarded;
1412
1413         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1414         KASSERT((ntohs(inp->inp_lport) & ncpus2_mask) == mycpuid,
1415             ("not target cpu"));
1416
1417         in_pcblink(inp, &udbinfo[mycpuid]);
1418
1419         forwarded = udp_inswildcardhash_oncpu(inp, &msg->base);
1420         if (forwarded) {
1421                 /* The message is further forwarded, so we are done here. */
1422                 return;
1423         }
1424         udp_inswildcard_replymsg(msg);
1425 }
1426
1427 static boolean_t
1428 udp_inswildcardhash(struct inpcb *inp, struct netmsg_base *msg, int error)
1429 {
1430         lwkt_msg_t lmsg = &msg->lmsg;
1431         int cpu;
1432
1433         ASSERT_INP_NOTINHASH(inp);
1434
1435         /* This inpcb could no longer be directly detached */
1436         inp->inp_flags &= ~INP_DIRECT_DETACH;
1437
1438         /*
1439          * Always clear the route cache, so we don't need to
1440          * worry about any owner CPU changes later.
1441          */
1442         in_pcbresetroute(inp);
1443
1444         KASSERT(inp->inp_lport != 0, ("local port not set yet"));
1445         cpu = ntohs(inp->inp_lport) & ncpus2_mask;
1446
1447         lmsg->ms_error = error;
1448         if (cpu != mycpuid) {
1449                 struct lwkt_port *port = netisr_cpuport(cpu);
1450
1451                 /*
1452                  * We are moving the protocol processing port the socket
1453                  * is on, we have to unlink here and re-link on the
1454                  * target cpu.
1455                  */
1456                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1457                 msg->nm_dispatch = udp_inswildcardhash_dispatch;
1458
1459                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1460                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1461                 lwkt_forwardmsg(port, lmsg);
1462                 return TRUE; /* forwarded */
1463         }
1464
1465         return udp_inswildcardhash_oncpu(inp, msg);
1466 }
1467
1468 static void
1469 udp_bind(netmsg_t msg)
1470 {
1471         struct socket *so = msg->bind.base.nm_so;
1472         struct inpcb *inp;
1473         int error;
1474
1475         inp = so->so_pcb;
1476         if (inp) {
1477                 struct sockaddr *nam = msg->bind.nm_nam;
1478                 struct thread *td = msg->bind.nm_td;
1479
1480                 error = in_pcbbind(inp, nam, td);
1481                 if (error == 0) {
1482                         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1483                         boolean_t forwarded;
1484
1485                         if (sin->sin_addr.s_addr != INADDR_ANY)
1486                                 inp->inp_flags |= INP_WASBOUND_NOTANY;
1487
1488                         forwarded = udp_inswildcardhash(inp,
1489                             &msg->bind.base, 0);
1490                         if (forwarded) {
1491                                 /*
1492                                  * The message is further forwarded, so
1493                                  * we are done here.
1494                                  */
1495                                 return;
1496                         }
1497                 }
1498         } else {
1499                 error = EINVAL;
1500         }
1501         lwkt_replymsg(&msg->bind.base.lmsg, error);
1502 }
1503
1504 static void
1505 udp_connect(netmsg_t msg)
1506 {
1507         struct socket *so = msg->connect.base.nm_so;
1508         struct sockaddr *nam = msg->connect.nm_nam;
1509         struct thread *td = msg->connect.nm_td;
1510         struct inpcb *inp;
1511         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1512         struct sockaddr_in *if_sin;
1513         struct lwkt_port *port;
1514         int error;
1515
1516         KKASSERT(msg->connect.nm_m == NULL);
1517
1518         inp = so->so_pcb;
1519         if (inp == NULL) {
1520                 error = EINVAL;
1521                 goto out;
1522         }
1523
1524         if (msg->connect.nm_flags & PRUC_RECONNECT) {
1525                 msg->connect.nm_flags &= ~PRUC_RECONNECT;
1526                 in_pcblink(inp, &udbinfo[mycpuid]);
1527         }
1528
1529         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1530                 error = EISCONN;
1531                 goto out;
1532         }
1533         error = 0;
1534
1535         /*
1536          * Bind if we have to
1537          */
1538         if (inp->inp_lport == 0) {
1539                 error = in_pcbbind(inp, NULL, td);
1540                 if (error)
1541                         goto out;
1542         }
1543
1544         /*
1545          * Calculate the correct protocol processing thread.  The connect
1546          * operation must run there.
1547          */
1548         error = in_pcbladdr(inp, nam, &if_sin, td);
1549         if (error)
1550                 goto out;
1551         if (!prison_remote_ip(td, nam)) {
1552                 error = EAFNOSUPPORT; /* IPv6 only jail */
1553                 goto out;
1554         }
1555
1556         port = udp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1557             inp->inp_laddr.s_addr != INADDR_ANY ?
1558             inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, inp->inp_lport);
1559         if (port != &curthread->td_msgport) {
1560                 lwkt_msg_t lmsg = &msg->connect.base.lmsg;
1561                 int nm_flags = PRUC_RECONNECT;
1562
1563                 /*
1564                  * in_pcbladdr() may have allocated a route entry for us
1565                  * on the current CPU, but we need a route entry on the
1566                  * inpcb's owner CPU, so free it here.
1567                  */
1568                 in_pcbresetroute(inp);
1569
1570                 if (inp->inp_flags & INP_WILDCARD) {
1571                         /*
1572                          * Remove this inpcb from the wildcard hash before
1573                          * the socket's msgport changes.
1574                          */
1575                         udp_remwildcardhash(inp);
1576                 }
1577
1578                 /*
1579                  * We are moving the protocol processing port the socket
1580                  * is on, we have to unlink here and re-link on the
1581                  * target cpu.
1582                  */
1583                 in_pcbunlink(inp, &udbinfo[mycpuid]);
1584                 msg->connect.nm_flags |= nm_flags;
1585
1586                 /* See the related comment in tcp_usrreq.c tcp_connect() */
1587                 lwkt_setmsg_receipt(lmsg, udp_sosetport);
1588                 lwkt_forwardmsg(port, lmsg);
1589                 /* msg invalid now */
1590                 return;
1591         }
1592         error = udp_connect_oncpu(inp, sin, if_sin);
1593 out:
1594         if (error && inp != NULL && inp->inp_lport != 0 &&
1595             (inp->inp_flags & INP_WILDCARD) == 0) {
1596                 boolean_t forwarded;
1597
1598                 /* Connect failed; put it to wildcard hash. */
1599                 forwarded = udp_inswildcardhash(inp, &msg->connect.base,
1600                     error);
1601                 if (forwarded) {
1602                         /*
1603                          * The message is further forwarded, so we are done
1604                          * here.
1605                          */
1606                         return;
1607                 }
1608         }
1609         lwkt_replymsg(&msg->connect.base.lmsg, error);
1610 }
1611
1612 static void
1613 udp_remwildcardhash(struct inpcb *inp)
1614 {
1615         int cpu;
1616
1617         KASSERT(inp->inp_pcbinfo == &udbinfo[mycpuid],
1618             ("not on owner cpu"));
1619
1620         for (cpu = 0; cpu < ncpus2; ++cpu) {
1621                 if (cpu == mycpuid) {
1622                         /*
1623                          * This inpcb will be removed by the later
1624                          * in_pcbremwildcardhash().
1625                          */
1626                         continue;
1627                 }
1628                 in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpu]);
1629         }
1630         in_pcbremwildcardhash(inp);
1631 }
1632
1633 static int
1634 udp_connect_oncpu(struct inpcb *inp, struct sockaddr_in *sin,
1635     struct sockaddr_in *if_sin)
1636 {
1637         struct socket *so = inp->inp_socket;
1638         struct inpcb *oinp;
1639
1640         oinp = in_pcblookup_hash(inp->inp_pcbinfo,
1641             sin->sin_addr, sin->sin_port,
1642             inp->inp_laddr.s_addr != INADDR_ANY ?
1643             inp->inp_laddr : if_sin->sin_addr, inp->inp_lport, FALSE, NULL);
1644         if (oinp != NULL)
1645                 return EADDRINUSE;
1646
1647         /*
1648          * No more errors can occur, finish adjusting the socket
1649          * and change the processing port to reflect the connected
1650          * socket.  Once set we can no longer safely mess with the
1651          * socket.
1652          */
1653
1654         if (inp->inp_flags & INP_WILDCARD)
1655                 udp_remwildcardhash(inp);
1656
1657         if (inp->inp_laddr.s_addr == INADDR_ANY)
1658                 inp->inp_laddr = if_sin->sin_addr;
1659         inp->inp_faddr = sin->sin_addr;
1660         inp->inp_fport = sin->sin_port;
1661         in_pcbinsconnhash(inp);
1662
1663         soisconnected(so);
1664
1665         return 0;
1666 }
1667
1668 static void
1669 udp_detach2(struct socket *so)
1670 {
1671         in_pcbdetach(so->so_pcb);
1672         sodiscard(so);
1673         sofree(so);
1674 }
1675
1676 static void
1677 udp_detach_final_dispatch(netmsg_t msg)
1678 {
1679         udp_detach2(msg->base.nm_so);
1680 }
1681
1682 static void
1683 udp_detach_oncpu_dispatch(netmsg_t msg)
1684 {
1685         struct netmsg_base *clomsg = &msg->base;
1686         struct socket *so = clomsg->nm_so;
1687         struct inpcb *inp = so->so_pcb;
1688         struct thread *td = curthread;
1689         int nextcpu, cpuid = mycpuid;
1690
1691         KASSERT(td->td_type == TD_TYPE_NETISR, ("not in netisr"));
1692
1693         if (inp->inp_flags & INP_WILDCARD) {
1694                 /*
1695                  * This inp will be removed on the inp's
1696                  * owner CPU later, so don't do it now.
1697                  */
1698                 if (&td->td_msgport != so->so_port)
1699                         in_pcbremwildcardhash_oncpu(inp, &udbinfo[cpuid]);
1700         }
1701
1702         if (cpuid == 0) {
1703                 /*
1704                  * Free and clear multicast socket option,
1705                  * which is only accessed in netisr0.
1706                  */
1707                 ip_freemoptions(inp->inp_moptions);
1708                 inp->inp_moptions = NULL;
1709         }
1710
1711         nextcpu = cpuid + 1;
1712         if (nextcpu < ncpus2) {
1713                 lwkt_forwardmsg(netisr_cpuport(nextcpu), &clomsg->lmsg);
1714         } else {
1715                 /*
1716                  * No one could see this inpcb now; destroy this
1717                  * inpcb in its owner netisr.
1718                  */
1719                 netmsg_init(clomsg, so, &netisr_apanic_rport, 0,
1720                     udp_detach_final_dispatch);
1721                 lwkt_sendmsg(so->so_port, &clomsg->lmsg);
1722         }
1723 }
1724
1725 static void
1726 udp_detach(netmsg_t msg)
1727 {
1728         struct socket *so = msg->detach.base.nm_so;
1729         struct netmsg_base *clomsg;
1730         struct inpcb *inp;
1731
1732         inp = so->so_pcb;
1733         if (inp == NULL) {
1734                 lwkt_replymsg(&msg->detach.base.lmsg, EINVAL);
1735                 return;
1736         }
1737
1738         /*
1739          * Reply EJUSTRETURN ASAP, we will call sodiscard() and
1740          * sofree() later.
1741          */
1742         lwkt_replymsg(&msg->detach.base.lmsg, EJUSTRETURN);
1743
1744         if (ncpus2 == 1) {
1745                 /* Only one CPU, detach the inpcb directly. */
1746                 udp_detach2(so);
1747                 return;
1748         }
1749
1750         /*
1751          * Remove this inpcb from the inpcb list first, so that
1752          * no one could find this inpcb from the inpcb list.
1753          */
1754         in_pcbofflist(inp);
1755
1756         if (inp->inp_flags & INP_DIRECT_DETACH) {
1757                 /*
1758                  * Direct detaching is allowed
1759                  */
1760                 KASSERT((inp->inp_flags & INP_WILDCARD) == 0,
1761                     ("in the wildcardhash"));
1762                 KASSERT(inp->inp_moptions == NULL, ("has mcast options"));
1763                 udp_detach2(so);
1764                 return;
1765         }
1766
1767         /*
1768          * Go through netisrs which process UDP to make sure
1769          * no one could find this inpcb anymore.
1770          */
1771         clomsg = &so->so_clomsg;
1772         netmsg_init(clomsg, so, &netisr_apanic_rport, MSGF_IGNSOPORT,
1773             udp_detach_oncpu_dispatch);
1774         lwkt_sendmsg(netisr_cpuport(0), &clomsg->lmsg);
1775 }
1776
1777 static void
1778 udp_disconnect(netmsg_t msg)
1779 {
1780         struct socket *so = msg->disconnect.base.nm_so;
1781         struct inpcb *inp;
1782         boolean_t forwarded;
1783         int error = 0;
1784
1785         inp = so->so_pcb;
1786         if (inp == NULL) {
1787                 error = EINVAL;
1788                 goto out;
1789         }
1790         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1791                 error = ENOTCONN;
1792                 goto out;
1793         }
1794
1795         soclrstate(so, SS_ISCONNECTED);         /* XXX */
1796
1797         in_pcbdisconnect(inp);
1798
1799         /*
1800          * Follow traditional BSD behavior and retain the local port
1801          * binding.  But, fix the old misbehavior of overwriting any
1802          * previously bound local address.
1803          */
1804         if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
1805                 inp->inp_laddr.s_addr = INADDR_ANY;
1806
1807         if (so->so_state & SS_ISCLOSING) {
1808                 /*
1809                  * If this socket is being closed, there is no need
1810                  * to put this socket back into wildcard hash table.
1811                  */
1812                 error = 0;
1813                 goto out;
1814         }
1815
1816         forwarded = udp_inswildcardhash(inp, &msg->disconnect.base, 0);
1817         if (forwarded) {
1818                 /*
1819                  * The message is further forwarded, so we are done
1820                  * here.
1821                  */
1822                 return;
1823         }
1824 out:
1825         lwkt_replymsg(&msg->disconnect.base.lmsg, error);
1826 }
1827
1828 void
1829 udp_shutdown(netmsg_t msg)
1830 {
1831         struct socket *so = msg->shutdown.base.nm_so;
1832         struct inpcb *inp;
1833         int error;
1834
1835         inp = so->so_pcb;
1836         if (inp) {
1837                 socantsendmore(so);
1838                 error = 0;
1839         } else {
1840                 error = EINVAL;
1841         }
1842         lwkt_replymsg(&msg->shutdown.base.lmsg, error);
1843 }
1844
1845 struct pr_usrreqs udp_usrreqs = {
1846         .pru_abort = udp_abort,
1847         .pru_accept = pr_generic_notsupp,
1848         .pru_attach = udp_attach,
1849         .pru_bind = udp_bind,
1850         .pru_connect = udp_connect,
1851         .pru_connect2 = pr_generic_notsupp,
1852         .pru_control = in_control_dispatch,
1853         .pru_detach = udp_detach,
1854         .pru_disconnect = udp_disconnect,
1855         .pru_listen = pr_generic_notsupp,
1856         .pru_peeraddr = in_setpeeraddr_dispatch,
1857         .pru_rcvd = pr_generic_notsupp,
1858         .pru_rcvoob = pr_generic_notsupp,
1859         .pru_send = udp_send,
1860         .pru_sense = pru_sense_null,
1861         .pru_shutdown = udp_shutdown,
1862         .pru_sockaddr = in_setsockaddr_dispatch,
1863         .pru_sosend = sosendudp,
1864         .pru_soreceive = soreceive
1865 };