sys/netinet/udp_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2008 Robert N. M. Watson
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * Copyright (c) 2014 Kevin Lo
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed by Robert N. M. Watson under
  10  * contract to Juniper Networks, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include "opt_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_ipsec.h"
  45 #include "opt_rss.h"
  46
  47 #include <sys/param.h>
  48 #include <sys/domain.h>
  49 #include <sys/eventhandler.h>
  50 #include <sys/jail.h>
  51 #include <sys/kernel.h>
  52 #include <sys/lock.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/priv.h>
  56 #include <sys/proc.h>
  57 #include <sys/protosw.h>
  58 #include <sys/sdt.h>
  59 #include <sys/signalvar.h>
  60 #include <sys/socket.h>
  61 #include <sys/socketvar.h>
  62 #include <sys/sx.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/syslog.h>
  65 #include <sys/systm.h>
  66
  67 #include <vm/uma.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_var.h>
  71 #include <net/route.h>
  72 #include <net/rss_config.h>
  73
  74 #include <netinet/in.h>
  75 #include <netinet/in_kdtrace.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/in_var.h>
  79 #include <netinet/ip.h>
  80 #ifdef INET6
  81 #include <netinet/ip6.h>
  82 #endif
  83 #include <netinet/ip_icmp.h>
  84 #include <netinet/icmp_var.h>
  85 #include <netinet/ip_var.h>
  86 #include <netinet/ip_options.h>
  87 #ifdef INET6
  88 #include <netinet6/ip6_var.h>
  89 #endif
  90 #include <netinet/udp.h>
  91 #include <netinet/udp_var.h>
  92 #include <netinet/udplite.h>
  93 #include <netinet/in_rss.h>
  94
  95 #ifdef IPSEC
  96 #include <netipsec/ipsec.h>
  97 #include <netipsec/esp.h>
  98 #endif
  99
 100 #include <machine/in_cksum.h>
 101
 102 #include <security/mac/mac_framework.h>
 103
 104 /*
 105  * UDP and UDP-Lite protocols implementation.
 106  * Per RFC 768, August, 1980.
 107  * Per RFC 3828, July, 2004.
 108  */
 109
 110 /*
 111  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
 112  * removes the only data integrity mechanism for packets and malformed
 113  * packets that would otherwise be discarded due to bad checksums, and may
 114  * cause problems (especially for NFS data blocks).
 115  */
 116 VNET_DEFINE(int, udp_cksum) = 1;
 117 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
 118     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
 119
 120 int     udp_log_in_vain = 0;
 121 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
 122     &udp_log_in_vain, 0, "Log all incoming UDP packets");
 123
 124 VNET_DEFINE(int, udp_blackhole) = 0;
 125 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
 126     &VNET_NAME(udp_blackhole), 0,
 127     "Do not send port unreachables for refused connects");
 128
 129 static VNET_DEFINE(int, udp_require_l2_bcast) = 0;
 130 #define V_udp_require_l2_bcast          VNET(udp_require_l2_bcast)
 131 SYSCTL_INT(_net_inet_udp, OID_AUTO, require_l2_bcast, CTLFLAG_VNET | CTLFLAG_RW,
 132     &VNET_NAME(udp_require_l2_bcast), 0,
 133     "Only treat packets sent to an L2 broadcast address as broadcast packets");
 134
 135 u_long  udp_sendspace = 9216;           /* really max datagram size */
 136 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
 137     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
 138
 139 u_long  udp_recvspace = 40 * (1024 +
 140 #ifdef INET6
 141                                       sizeof(struct sockaddr_in6)
 142 #else
 143                                       sizeof(struct sockaddr_in)
 144 #endif
 145                                       );        /* 40 1K datagrams */
 146
 147 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 148     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
 149
 150 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
 151 VNET_DEFINE(struct inpcbinfo, udbinfo);
 152 VNET_DEFINE(struct inpcbhead, ulitecb);
 153 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
 154 static VNET_DEFINE(uma_zone_t, udpcb_zone);
 155 #define V_udpcb_zone                    VNET(udpcb_zone)
 156
 157 #ifndef UDBHASHSIZE
 158 #define UDBHASHSIZE     128
 159 #endif
 160
 161 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
 162 VNET_PCPUSTAT_SYSINIT(udpstat);
 163 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
 164     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
 165
 166 #ifdef VIMAGE
 167 VNET_PCPUSTAT_SYSUNINIT(udpstat);
 168 #endif /* VIMAGE */
 169 #ifdef INET
 170 static void     udp_detach(struct socket *so);
 171 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
 172                     struct mbuf *, struct thread *);
 173 #endif
 174
 175 #ifdef IPSEC
 176 #ifdef IPSEC_NAT_T
 177 #define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP)
 178 #ifdef INET
 179 static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int);
 180 #endif
 181 #endif /* IPSEC_NAT_T */
 182 #endif /* IPSEC */
 183
 184 static void
 185 udp_zone_change(void *tag)
 186 {
 187
 188         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
 189         uma_zone_set_max(V_udpcb_zone, maxsockets);
 190 }
 191
 192 static int
 193 udp_inpcb_init(void *mem, int size, int flags)
 194 {
 195         struct inpcb *inp;
 196
 197         inp = mem;
 198         INP_LOCK_INIT(inp, "inp", "udpinp");
 199         return (0);
 200 }
 201
 202 static int
 203 udplite_inpcb_init(void *mem, int size, int flags)
 204 {
 205         struct inpcb *inp;
 206
 207         inp = mem;
 208         INP_LOCK_INIT(inp, "inp", "udpliteinp");
 209         return (0);
 210 }
 211
 212 void
 213 udp_init(void)
 214 {
 215
 216         /*
 217          * For now default to 2-tuple UDP hashing - until the fragment
 218          * reassembly code can also update the flowid.
 219          *
 220          * Once we can calculate the flowid that way and re-establish
 221          * a 4-tuple, flip this to 4-tuple.
 222          */
 223         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
 224             "udp_inpcb", udp_inpcb_init, NULL, 0,
 225             IPI_HASHFIELDS_2TUPLE);
 226         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
 227             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 228         uma_zone_set_max(V_udpcb_zone, maxsockets);
 229         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
 230         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
 231             EVENTHANDLER_PRI_ANY);
 232 }
 233
 234 void
 235 udplite_init(void)
 236 {
 237
 238         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
 239             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
 240             0, IPI_HASHFIELDS_2TUPLE);
 241 }
 242
 243 /*
 244  * Kernel module interface for updating udpstat.  The argument is an index
 245  * into udpstat treated as an array of u_long.  While this encodes the
 246  * general layout of udpstat into the caller, it doesn't encode its location,
 247  * so that future changes to add, for example, per-CPU stats support won't
 248  * cause binary compatibility problems for kernel modules.
 249  */
 250 void
 251 kmod_udpstat_inc(int statnum)
 252 {
 253
 254         counter_u64_add(VNET(udpstat)[statnum], 1);
 255 }
 256
 257 int
 258 udp_newudpcb(struct inpcb *inp)
 259 {
 260         struct udpcb *up;
 261
 262         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
 263         if (up == NULL)
 264                 return (ENOBUFS);
 265         inp->inp_ppcb = up;
 266         return (0);
 267 }
 268
 269 void
 270 udp_discardcb(struct udpcb *up)
 271 {
 272
 273         uma_zfree(V_udpcb_zone, up);
 274 }
 275
 276 #ifdef VIMAGE
 277 static void
 278 udp_destroy(void *unused __unused)
 279 {
 280
 281         in_pcbinfo_destroy(&V_udbinfo);
 282         uma_zdestroy(V_udpcb_zone);
 283 }
 284 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
 285
 286 static void
 287 udplite_destroy(void *unused __unused)
 288 {
 289
 290         in_pcbinfo_destroy(&V_ulitecbinfo);
 291 }
 292 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
 293     NULL);
 294 #endif
 295
 296 #ifdef INET
 297 /*
 298  * Subroutine of udp_input(), which appends the provided mbuf chain to the
 299  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
 300  * contains the source address.  If the socket ends up being an IPv6 socket,
 301  * udp_append() will convert to a sockaddr_in6 before passing the address
 302  * into the socket code.
 303  *
 304  * In the normal case udp_append() will return 0, indicating that you
 305  * must unlock the inp. However if a tunneling protocol is in place we increment
 306  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
 307  * then decrement the reference count. If the inp_rele returns 1, indicating the
 308  * inp is gone, we return that to the caller to tell them *not* to unlock
 309  * the inp. In the case of multi-cast this will cause the distribution
 310  * to stop (though most tunneling protocols known currently do *not* use
 311  * multicast).
 312  */
 313 static int
 314 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
 315     struct sockaddr_in *udp_in)
 316 {
 317         struct sockaddr *append_sa;
 318         struct socket *so;
 319         struct mbuf *opts = NULL;
 320 #ifdef INET6
 321         struct sockaddr_in6 udp_in6;
 322 #endif
 323         struct udpcb *up;
 324
 325         INP_LOCK_ASSERT(inp);
 326
 327         /*
 328          * Engage the tunneling protocol.
 329          */
 330         up = intoudpcb(inp);
 331         if (up->u_tun_func != NULL) {
 332                 in_pcbref(inp);
 333                 INP_RUNLOCK(inp);
 334                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
 335                     up->u_tun_ctx);
 336                 INP_RLOCK(inp);
 337                 return (in_pcbrele_rlocked(inp));
 338         }
 339
 340         off += sizeof(struct udphdr);
 341
 342 #ifdef IPSEC
 343         /* Check AH/ESP integrity. */
 344         if (ipsec4_in_reject(n, inp)) {
 345                 m_freem(n);
 346                 return (0);
 347         }
 348 #ifdef IPSEC_NAT_T
 349         up = intoudpcb(inp);
 350         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
 351         if (up->u_flags & UF_ESPINUDP_ALL) {    /* IPSec UDP encaps. */
 352                 n = udp4_espdecap(inp, n, off);
 353                 if (n == NULL)                          /* Consumed. */
 354                         return (0);
 355         }
 356 #endif /* IPSEC_NAT_T */
 357 #endif /* IPSEC */
 358 #ifdef MAC
 359         if (mac_inpcb_check_deliver(inp, n) != 0) {
 360                 m_freem(n);
 361                 return (0);
 362         }
 363 #endif /* MAC */
 364         if (inp->inp_flags & INP_CONTROLOPTS ||
 365             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
 366 #ifdef INET6
 367                 if (inp->inp_vflag & INP_IPV6)
 368                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
 369                 else
 370 #endif /* INET6 */
 371                         ip_savecontrol(inp, &opts, ip, n);
 372         }
 373 #ifdef INET6
 374         if (inp->inp_vflag & INP_IPV6) {
 375                 bzero(&udp_in6, sizeof(udp_in6));
 376                 udp_in6.sin6_len = sizeof(udp_in6);
 377                 udp_in6.sin6_family = AF_INET6;
 378                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
 379                 append_sa = (struct sockaddr *)&udp_in6;
 380         } else
 381 #endif /* INET6 */
 382                 append_sa = (struct sockaddr *)udp_in;
 383         m_adj(n, off);
 384
 385         so = inp->inp_socket;
 386         SOCKBUF_LOCK(&so->so_rcv);
 387         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
 388                 SOCKBUF_UNLOCK(&so->so_rcv);
 389                 m_freem(n);
 390                 if (opts)
 391                         m_freem(opts);
 392                 UDPSTAT_INC(udps_fullsock);
 393         } else
 394                 sorwakeup_locked(so);
 395         return (0);
 396 }
 397
 398 int
 399 udp_input(struct mbuf **mp, int *offp, int proto)
 400 {
 401         struct ip *ip;
 402         struct udphdr *uh;
 403         struct ifnet *ifp;
 404         struct inpcb *inp;
 405         uint16_t len, ip_len;
 406         struct inpcbinfo *pcbinfo;
 407         struct ip save_ip;
 408         struct sockaddr_in udp_in;
 409         struct mbuf *m;
 410         struct m_tag *fwd_tag;
 411         int cscov_partial, iphlen;
 412
 413         m = *mp;
 414         iphlen = *offp;
 415         ifp = m->m_pkthdr.rcvif;
 416         *mp = NULL;
 417         UDPSTAT_INC(udps_ipackets);
 418
 419         /*
 420          * Strip IP options, if any; should skip this, make available to
 421          * user, and use on returned packets, but we don't yet have a way to
 422          * check the checksum with options still present.
 423          */
 424         if (iphlen > sizeof (struct ip)) {
 425                 ip_stripoptions(m);
 426                 iphlen = sizeof(struct ip);
 427         }
 428
 429         /*
 430          * Get IP and UDP header together in first mbuf.
 431          */
 432         ip = mtod(m, struct ip *);
 433         if (m->m_len < iphlen + sizeof(struct udphdr)) {
 434                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
 435                         UDPSTAT_INC(udps_hdrops);
 436                         return (IPPROTO_DONE);
 437                 }
 438                 ip = mtod(m, struct ip *);
 439         }
 440         uh = (struct udphdr *)((caddr_t)ip + iphlen);
 441         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
 442
 443         /*
 444          * Destination port of 0 is illegal, based on RFC768.
 445          */
 446         if (uh->uh_dport == 0)
 447                 goto badunlocked;
 448
 449         /*
 450          * Construct sockaddr format source address.  Stuff source address
 451          * and datagram in user buffer.
 452          */
 453         bzero(&udp_in, sizeof(udp_in));
 454         udp_in.sin_len = sizeof(udp_in);
 455         udp_in.sin_family = AF_INET;
 456         udp_in.sin_port = uh->uh_sport;
 457         udp_in.sin_addr = ip->ip_src;
 458
 459         /*
 460          * Make mbuf data length reflect UDP length.  If not enough data to
 461          * reflect UDP length, drop.
 462          */
 463         len = ntohs((u_short)uh->uh_ulen);
 464         ip_len = ntohs(ip->ip_len) - iphlen;
 465         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
 466                 /* Zero means checksum over the complete packet. */
 467                 if (len == 0)
 468                         len = ip_len;
 469                 cscov_partial = 0;
 470         }
 471         if (ip_len != len) {
 472                 if (len > ip_len || len < sizeof(struct udphdr)) {
 473                         UDPSTAT_INC(udps_badlen);
 474                         goto badunlocked;
 475                 }
 476                 if (proto == IPPROTO_UDP)
 477                         m_adj(m, len - ip_len);
 478         }
 479
 480         /*
 481          * Save a copy of the IP header in case we want restore it for
 482          * sending an ICMP error message in response.
 483          */
 484         if (!V_udp_blackhole)
 485                 save_ip = *ip;
 486         else
 487                 memset(&save_ip, 0, sizeof(save_ip));
 488
 489         /*
 490          * Checksum extended UDP header and data.
 491          */
 492         if (uh->uh_sum) {
 493                 u_short uh_sum;
 494
 495                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
 496                     !cscov_partial) {
 497                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
 498                                 uh_sum = m->m_pkthdr.csum_data;
 499                         else
 500                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
 501                                     ip->ip_dst.s_addr, htonl((u_short)len +
 502                                     m->m_pkthdr.csum_data + proto));
 503                         uh_sum ^= 0xffff;
 504                 } else {
 505                         char b[9];
 506
 507                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
 508                         bzero(((struct ipovly *)ip)->ih_x1, 9);
 509                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
 510                             uh->uh_ulen : htons(ip_len);
 511                         uh_sum = in_cksum(m, len + sizeof (struct ip));
 512                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
 513                 }
 514                 if (uh_sum) {
 515                         UDPSTAT_INC(udps_badsum);
 516                         m_freem(m);
 517                         return (IPPROTO_DONE);
 518                 }
 519         } else {
 520                 if (proto == IPPROTO_UDP) {
 521                         UDPSTAT_INC(udps_nosum);
 522                 } else {
 523                         /* UDPLite requires a checksum */
 524                         /* XXX: What is the right UDPLite MIB counter here? */
 525                         m_freem(m);
 526                         return (IPPROTO_DONE);
 527                 }
 528         }
 529
 530         pcbinfo = udp_get_inpcbinfo(proto);
 531         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
 532             ((!V_udp_require_l2_bcast || m->m_flags & M_BCAST) &&
 533             in_broadcast(ip->ip_dst, ifp))) {
 534                 struct inpcb *last;
 535                 struct inpcbhead *pcblist;
 536                 struct ip_moptions *imo;
 537
 538                 INP_INFO_RLOCK(pcbinfo);
 539                 pcblist = udp_get_pcblist(proto);
 540                 last = NULL;
 541                 LIST_FOREACH(inp, pcblist, inp_list) {
 542                         if (inp->inp_lport != uh->uh_dport)
 543                                 continue;
 544 #ifdef INET6
 545                         if ((inp->inp_vflag & INP_IPV4) == 0)
 546                                 continue;
 547 #endif
 548                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
 549                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
 550                                 continue;
 551                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
 552                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
 553                                 continue;
 554                         if (inp->inp_fport != 0 &&
 555                             inp->inp_fport != uh->uh_sport)
 556                                 continue;
 557
 558                         INP_RLOCK(inp);
 559
 560                         /*
 561                          * XXXRW: Because we weren't holding either the inpcb
 562                          * or the hash lock when we checked for a match
 563                          * before, we should probably recheck now that the
 564                          * inpcb lock is held.
 565                          */
 566
 567                         /*
 568                          * Handle socket delivery policy for any-source
 569                          * and source-specific multicast. [RFC3678]
 570                          */
 571                         imo = inp->inp_moptions;
 572                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 573                                 struct sockaddr_in       group;
 574                                 int                      blocked;
 575                                 if (imo == NULL) {
 576                                         INP_RUNLOCK(inp);
 577                                         continue;
 578                                 }
 579                                 bzero(&group, sizeof(struct sockaddr_in));
 580                                 group.sin_len = sizeof(struct sockaddr_in);
 581                                 group.sin_family = AF_INET;
 582                                 group.sin_addr = ip->ip_dst;
 583
 584                                 blocked = imo_multi_filter(imo, ifp,
 585                                         (struct sockaddr *)&group,
 586                                         (struct sockaddr *)&udp_in);
 587                                 if (blocked != MCAST_PASS) {
 588                                         if (blocked == MCAST_NOTGMEMBER)
 589                                                 IPSTAT_INC(ips_notmember);
 590                                         if (blocked == MCAST_NOTSMEMBER ||
 591                                             blocked == MCAST_MUTED)
 592                                                 UDPSTAT_INC(udps_filtermcast);
 593                                         INP_RUNLOCK(inp);
 594                                         continue;
 595                                 }
 596                         }
 597                         if (last != NULL) {
 598                                 struct mbuf *n;
 599
 600                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
 601                                     NULL) {
 602                                         UDP_PROBE(receive, NULL, last, ip,
 603                                             last, uh);
 604                                         if (udp_append(last, ip, n, iphlen,
 605                                                 &udp_in)) {
 606                                                 goto inp_lost;
 607                                         }
 608                                 }
 609                                 INP_RUNLOCK(last);
 610                         }
 611                         last = inp;
 612                         /*
 613                          * Don't look for additional matches if this one does
 614                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 615                          * socket options set.  This heuristic avoids
 616                          * searching through all pcbs in the common case of a
 617                          * non-shared port.  It assumes that an application
 618                          * will never clear these options after setting them.
 619                          */
 620                         if ((last->inp_socket->so_options &
 621                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 622                                 break;
 623                 }
 624
 625                 if (last == NULL) {
 626                         /*
 627                          * No matching pcb found; discard datagram.  (No need
 628                          * to send an ICMP Port Unreachable for a broadcast
 629                          * or multicast datgram.)
 630                          */
 631                         UDPSTAT_INC(udps_noportbcast);
 632                         if (inp)
 633                                 INP_RUNLOCK(inp);
 634                         INP_INFO_RUNLOCK(pcbinfo);
 635                         goto badunlocked;
 636                 }
 637                 UDP_PROBE(receive, NULL, last, ip, last, uh);
 638                 if (udp_append(last, ip, m, iphlen, &udp_in) == 0)
 639                         INP_RUNLOCK(last);
 640         inp_lost:
 641                 INP_INFO_RUNLOCK(pcbinfo);
 642                 return (IPPROTO_DONE);
 643         }
 644
 645         /*
 646          * Locate pcb for datagram.
 647          */
 648
 649         /*
 650          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
 651          */
 652         if ((m->m_flags & M_IP_NEXTHOP) &&
 653             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 654                 struct sockaddr_in *next_hop;
 655
 656                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
 657
 658                 /*
 659                  * Transparently forwarded. Pretend to be the destination.
 660                  * Already got one like this?
 661                  */
 662                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 663                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
 664                 if (!inp) {
 665                         /*
 666                          * It's new.  Try to find the ambushing socket.
 667                          * Because we've rewritten the destination address,
 668                          * any hardware-generated hash is ignored.
 669                          */
 670                         inp = in_pcblookup(pcbinfo, ip->ip_src,
 671                             uh->uh_sport, next_hop->sin_addr,
 672                             next_hop->sin_port ? htons(next_hop->sin_port) :
 673                             uh->uh_dport, INPLOOKUP_WILDCARD |
 674                             INPLOOKUP_RLOCKPCB, ifp);
 675                 }
 676                 /* Remove the tag from the packet. We don't need it anymore. */
 677                 m_tag_delete(m, fwd_tag);
 678                 m->m_flags &= ~M_IP_NEXTHOP;
 679         } else
 680                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
 681                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
 682                     INPLOOKUP_RLOCKPCB, ifp, m);
 683         if (inp == NULL) {
 684                 if (udp_log_in_vain) {
 685                         char buf[4*sizeof "123"];
 686
 687                         strcpy(buf, inet_ntoa(ip->ip_dst));
 688                         log(LOG_INFO,
 689                             "Connection attempt to UDP %s:%d from %s:%d\n",
 690                             buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
 691                             ntohs(uh->uh_sport));
 692                 }
 693                 UDPSTAT_INC(udps_noport);
 694                 if (m->m_flags & (M_BCAST | M_MCAST)) {
 695                         UDPSTAT_INC(udps_noportbcast);
 696                         goto badunlocked;
 697                 }
 698                 if (V_udp_blackhole)
 699                         goto badunlocked;
 700                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
 701                         goto badunlocked;
 702                 *ip = save_ip;
 703                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
 704                 return (IPPROTO_DONE);
 705         }
 706
 707         /*
 708          * Check the minimum TTL for socket.
 709          */
 710         INP_RLOCK_ASSERT(inp);
 711         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
 712                 INP_RUNLOCK(inp);
 713                 m_freem(m);
 714                 return (IPPROTO_DONE);
 715         }
 716         if (cscov_partial) {
 717                 struct udpcb *up;
 718
 719                 up = intoudpcb(inp);
 720                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
 721                         INP_RUNLOCK(inp);
 722                         m_freem(m);
 723                         return (IPPROTO_DONE);
 724                 }
 725         }
 726
 727         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
 728         if (udp_append(inp, ip, m, iphlen, &udp_in) == 0)
 729                 INP_RUNLOCK(inp);
 730         return (IPPROTO_DONE);
 731
 732 badunlocked:
 733         m_freem(m);
 734         return (IPPROTO_DONE);
 735 }
 736 #endif /* INET */
 737
 738 /*
 739  * Notify a udp user of an asynchronous error; just wake up so that they can
 740  * collect error status.
 741  */
 742 struct inpcb *
 743 udp_notify(struct inpcb *inp, int errno)
 744 {
 745
 746         /*
 747          * While udp_ctlinput() always calls udp_notify() with a read lock
 748          * when invoking it directly, in_pcbnotifyall() currently uses write
 749          * locks due to sharing code with TCP.  For now, accept either a read
 750          * or a write lock, but a read lock is sufficient.
 751          */
 752         INP_LOCK_ASSERT(inp);
 753         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
 754              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
 755                 RTFREE(inp->inp_route.ro_rt);
 756                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
 757         }
 758
 759         inp->inp_socket->so_error = errno;
 760         sorwakeup(inp->inp_socket);
 761         sowwakeup(inp->inp_socket);
 762         return (inp);
 763 }
 764
 765 #ifdef INET
 766 static void
 767 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
 768     struct inpcbinfo *pcbinfo)
 769 {
 770         struct ip *ip = vip;
 771         struct udphdr *uh;
 772         struct in_addr faddr;
 773         struct inpcb *inp;
 774
 775         faddr = ((struct sockaddr_in *)sa)->sin_addr;
 776         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
 777                 return;
 778
 779         if (PRC_IS_REDIRECT(cmd)) {
 780                 /* signal EHOSTDOWN, as it flushes the cached route */
 781                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
 782                 return;
 783         }
 784
 785         /*
 786          * Hostdead is ugly because it goes linearly through all PCBs.
 787          *
 788          * XXX: We never get this from ICMP, otherwise it makes an excellent
 789          * DoS attack on machines with many connections.
 790          */
 791         if (cmd == PRC_HOSTDEAD)
 792                 ip = NULL;
 793         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
 794                 return;
 795         if (ip != NULL) {
 796                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
 797                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 798                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
 799                 if (inp != NULL) {
 800                         INP_RLOCK_ASSERT(inp);
 801                         if (inp->inp_socket != NULL) {
 802                                 udp_notify(inp, inetctlerrmap[cmd]);
 803                         }
 804                         INP_RUNLOCK(inp);
 805                 } else {
 806                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
 807                                            ip->ip_src, uh->uh_sport,
 808                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 809                         if (inp != NULL) {
 810                                 struct udpcb *up;
 811
 812                                 up = intoudpcb(inp);
 813                                 if (up->u_icmp_func != NULL) {
 814                                         INP_RUNLOCK(inp);
 815                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
 816                                 } else {
 817                                         INP_RUNLOCK(inp);
 818                                 }
 819                         }
 820                 }
 821         } else
 822                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
 823                     udp_notify);
 824 }
 825 void
 826 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 827 {
 828
 829         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
 830 }
 831
 832 void
 833 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
 834 {
 835
 836         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
 837 }
 838 #endif /* INET */
 839
 840 static int
 841 udp_pcblist(SYSCTL_HANDLER_ARGS)
 842 {
 843         int error, i, n;
 844         struct inpcb *inp, **inp_list;
 845         inp_gen_t gencnt;
 846         struct xinpgen xig;
 847
 848         /*
 849          * The process of preparing the PCB list is too time-consuming and
 850          * resource-intensive to repeat twice on every request.
 851          */
 852         if (req->oldptr == 0) {
 853                 n = V_udbinfo.ipi_count;
 854                 n += imax(n / 8, 10);
 855                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
 856                 return (0);
 857         }
 858
 859         if (req->newptr != 0)
 860                 return (EPERM);
 861
 862         /*
 863          * OK, now we're committed to doing something.
 864          */
 865         INP_INFO_RLOCK(&V_udbinfo);
 866         gencnt = V_udbinfo.ipi_gencnt;
 867         n = V_udbinfo.ipi_count;
 868         INP_INFO_RUNLOCK(&V_udbinfo);
 869
 870         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
 871                 + n * sizeof(struct xinpcb));
 872         if (error != 0)
 873                 return (error);
 874
 875         xig.xig_len = sizeof xig;
 876         xig.xig_count = n;
 877         xig.xig_gen = gencnt;
 878         xig.xig_sogen = so_gencnt;
 879         error = SYSCTL_OUT(req, &xig, sizeof xig);
 880         if (error)
 881                 return (error);
 882
 883         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
 884         if (inp_list == NULL)
 885                 return (ENOMEM);
 886
 887         INP_INFO_RLOCK(&V_udbinfo);
 888         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
 889              inp = LIST_NEXT(inp, inp_list)) {
 890                 INP_WLOCK(inp);
 891                 if (inp->inp_gencnt <= gencnt &&
 892                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
 893                         in_pcbref(inp);
 894                         inp_list[i++] = inp;
 895                 }
 896                 INP_WUNLOCK(inp);
 897         }
 898         INP_INFO_RUNLOCK(&V_udbinfo);
 899         n = i;
 900
 901         error = 0;
 902         for (i = 0; i < n; i++) {
 903                 inp = inp_list[i];
 904                 INP_RLOCK(inp);
 905                 if (inp->inp_gencnt <= gencnt) {
 906                         struct xinpcb xi;
 907
 908                         bzero(&xi, sizeof(xi));
 909                         xi.xi_len = sizeof xi;
 910                         /* XXX should avoid extra copy */
 911                         bcopy(inp, &xi.xi_inp, sizeof *inp);
 912                         if (inp->inp_socket)
 913                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
 914                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
 915                         INP_RUNLOCK(inp);
 916                         error = SYSCTL_OUT(req, &xi, sizeof xi);
 917                 } else
 918                         INP_RUNLOCK(inp);
 919         }
 920         INP_INFO_WLOCK(&V_udbinfo);
 921         for (i = 0; i < n; i++) {
 922                 inp = inp_list[i];
 923                 INP_RLOCK(inp);
 924                 if (!in_pcbrele_rlocked(inp))
 925                         INP_RUNLOCK(inp);
 926         }
 927         INP_INFO_WUNLOCK(&V_udbinfo);
 928
 929         if (!error) {
 930                 /*
 931                  * Give the user an updated idea of our state.  If the
 932                  * generation differs from what we told her before, she knows
 933                  * that something happened while we were processing this
 934                  * request, and it might be necessary to retry.
 935                  */
 936                 INP_INFO_RLOCK(&V_udbinfo);
 937                 xig.xig_gen = V_udbinfo.ipi_gencnt;
 938                 xig.xig_sogen = so_gencnt;
 939                 xig.xig_count = V_udbinfo.ipi_count;
 940                 INP_INFO_RUNLOCK(&V_udbinfo);
 941                 error = SYSCTL_OUT(req, &xig, sizeof xig);
 942         }
 943         free(inp_list, M_TEMP);
 944         return (error);
 945 }
 946
 947 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
 948     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
 949     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
 950
 951 #ifdef INET
 952 static int
 953 udp_getcred(SYSCTL_HANDLER_ARGS)
 954 {
 955         struct xucred xuc;
 956         struct sockaddr_in addrs[2];
 957         struct inpcb *inp;
 958         int error;
 959
 960         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 961         if (error)
 962                 return (error);
 963         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 964         if (error)
 965                 return (error);
 966         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
 967             addrs[0].sin_addr, addrs[0].sin_port,
 968             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
 969         if (inp != NULL) {
 970                 INP_RLOCK_ASSERT(inp);
 971                 if (inp->inp_socket == NULL)
 972                         error = ENOENT;
 973                 if (error == 0)
 974                         error = cr_canseeinpcb(req->td->td_ucred, inp);
 975                 if (error == 0)
 976                         cru2x(inp->inp_cred, &xuc);
 977                 INP_RUNLOCK(inp);
 978         } else
 979                 error = ENOENT;
 980         if (error == 0)
 981                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 982         return (error);
 983 }
 984
 985 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
 986     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
 987     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
 988 #endif /* INET */
 989
 990 int
 991 udp_ctloutput(struct socket *so, struct sockopt *sopt)
 992 {
 993         struct inpcb *inp;
 994         struct udpcb *up;
 995         int isudplite, error, optval;
 996
 997         error = 0;
 998         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
 999         inp = sotoinpcb(so);
1000         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1001         INP_WLOCK(inp);
1002         if (sopt->sopt_level != so->so_proto->pr_protocol) {
1003 #ifdef INET6
1004                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
1005                         INP_WUNLOCK(inp);
1006                         error = ip6_ctloutput(so, sopt);
1007                 }
1008 #endif
1009 #if defined(INET) && defined(INET6)
1010                 else
1011 #endif
1012 #ifdef INET
1013                 {
1014                         INP_WUNLOCK(inp);
1015                         error = ip_ctloutput(so, sopt);
1016                 }
1017 #endif
1018                 return (error);
1019         }
1020
1021         switch (sopt->sopt_dir) {
1022         case SOPT_SET:
1023                 switch (sopt->sopt_name) {
1024                 case UDP_ENCAP:
1025                         INP_WUNLOCK(inp);
1026                         error = sooptcopyin(sopt, &optval, sizeof optval,
1027                                             sizeof optval);
1028                         if (error)
1029                                 break;
1030                         inp = sotoinpcb(so);
1031                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1032                         INP_WLOCK(inp);
1033 #ifdef IPSEC_NAT_T
1034                         up = intoudpcb(inp);
1035                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1036 #endif
1037                         switch (optval) {
1038                         case 0:
1039                                 /* Clear all UDP encap. */
1040 #ifdef IPSEC_NAT_T
1041                                 up->u_flags &= ~UF_ESPINUDP_ALL;
1042 #endif
1043                                 break;
1044 #ifdef IPSEC_NAT_T
1045                         case UDP_ENCAP_ESPINUDP:
1046                         case UDP_ENCAP_ESPINUDP_NON_IKE:
1047                                 up->u_flags &= ~UF_ESPINUDP_ALL;
1048                                 if (optval == UDP_ENCAP_ESPINUDP)
1049                                         up->u_flags |= UF_ESPINUDP;
1050                                 else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE)
1051                                         up->u_flags |= UF_ESPINUDP_NON_IKE;
1052                                 break;
1053 #endif
1054                         default:
1055                                 error = EINVAL;
1056                                 break;
1057                         }
1058                         INP_WUNLOCK(inp);
1059                         break;
1060                 case UDPLITE_SEND_CSCOV:
1061                 case UDPLITE_RECV_CSCOV:
1062                         if (!isudplite) {
1063                                 INP_WUNLOCK(inp);
1064                                 error = ENOPROTOOPT;
1065                                 break;
1066                         }
1067                         INP_WUNLOCK(inp);
1068                         error = sooptcopyin(sopt, &optval, sizeof(optval),
1069                             sizeof(optval));
1070                         if (error != 0)
1071                                 break;
1072                         inp = sotoinpcb(so);
1073                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1074                         INP_WLOCK(inp);
1075                         up = intoudpcb(inp);
1076                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1077                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
1078                                 INP_WUNLOCK(inp);
1079                                 error = EINVAL;
1080                                 break;
1081                         }
1082                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1083                                 up->u_txcslen = optval;
1084                         else
1085                                 up->u_rxcslen = optval;
1086                         INP_WUNLOCK(inp);
1087                         break;
1088                 default:
1089                         INP_WUNLOCK(inp);
1090                         error = ENOPROTOOPT;
1091                         break;
1092                 }
1093                 break;
1094         case SOPT_GET:
1095                 switch (sopt->sopt_name) {
1096 #ifdef IPSEC_NAT_T
1097                 case UDP_ENCAP:
1098                         up = intoudpcb(inp);
1099                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1100                         optval = up->u_flags & UF_ESPINUDP_ALL;
1101                         INP_WUNLOCK(inp);
1102                         error = sooptcopyout(sopt, &optval, sizeof optval);
1103                         break;
1104 #endif
1105                 case UDPLITE_SEND_CSCOV:
1106                 case UDPLITE_RECV_CSCOV:
1107                         if (!isudplite) {
1108                                 INP_WUNLOCK(inp);
1109                                 error = ENOPROTOOPT;
1110                                 break;
1111                         }
1112                         up = intoudpcb(inp);
1113                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1114                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1115                                 optval = up->u_txcslen;
1116                         else
1117                                 optval = up->u_rxcslen;
1118                         INP_WUNLOCK(inp);
1119                         error = sooptcopyout(sopt, &optval, sizeof(optval));
1120                         break;
1121                 default:
1122                         INP_WUNLOCK(inp);
1123                         error = ENOPROTOOPT;
1124                         break;
1125                 }
1126                 break;
1127         }
1128         return (error);
1129 }
1130
1131 #ifdef INET
1132 #define UH_WLOCKED      2
1133 #define UH_RLOCKED      1
1134 #define UH_UNLOCKED     0
1135 static int
1136 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
1137     struct mbuf *control, struct thread *td)
1138 {
1139         struct udpiphdr *ui;
1140         int len = m->m_pkthdr.len;
1141         struct in_addr faddr, laddr;
1142         struct cmsghdr *cm;
1143         struct inpcbinfo *pcbinfo;
1144         struct sockaddr_in *sin, src;
1145         int cscov_partial = 0;
1146         int error = 0;
1147         int ipflags;
1148         u_short fport, lport;
1149         int unlock_udbinfo, unlock_inp;
1150         u_char tos;
1151         uint8_t pr;
1152         uint16_t cscov = 0;
1153         uint32_t flowid = 0;
1154         uint8_t flowtype = M_HASHTYPE_NONE;
1155
1156         /*
1157          * udp_output() may need to temporarily bind or connect the current
1158          * inpcb.  As such, we don't know up front whether we will need the
1159          * pcbinfo lock or not.  Do any work to decide what is needed up
1160          * front before acquiring any locks.
1161          */
1162         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1163                 if (control)
1164                         m_freem(control);
1165                 m_freem(m);
1166                 return (EMSGSIZE);
1167         }
1168
1169         src.sin_family = 0;
1170         sin = (struct sockaddr_in *)addr;
1171         if (sin == NULL ||
1172             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1173                 INP_WLOCK(inp);
1174                 unlock_inp = UH_WLOCKED;
1175         } else {
1176                 INP_RLOCK(inp);
1177                 unlock_inp = UH_RLOCKED;
1178         }
1179         tos = inp->inp_ip_tos;
1180         if (control != NULL) {
1181                 /*
1182                  * XXX: Currently, we assume all the optional information is
1183                  * stored in a single mbuf.
1184                  */
1185                 if (control->m_next) {
1186                         if (unlock_inp == UH_WLOCKED)
1187                                 INP_WUNLOCK(inp);
1188                         else
1189                                 INP_RUNLOCK(inp);
1190                         m_freem(control);
1191                         m_freem(m);
1192                         return (EINVAL);
1193                 }
1194                 for (; control->m_len > 0;
1195                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
1196                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1197                         cm = mtod(control, struct cmsghdr *);
1198                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1199                             || cm->cmsg_len > control->m_len) {
1200                                 error = EINVAL;
1201                                 break;
1202                         }
1203                         if (cm->cmsg_level != IPPROTO_IP)
1204                                 continue;
1205
1206                         switch (cm->cmsg_type) {
1207                         case IP_SENDSRCADDR:
1208                                 if (cm->cmsg_len !=
1209                                     CMSG_LEN(sizeof(struct in_addr))) {
1210                                         error = EINVAL;
1211                                         break;
1212                                 }
1213                                 bzero(&src, sizeof(src));
1214                                 src.sin_family = AF_INET;
1215                                 src.sin_len = sizeof(src);
1216                                 src.sin_port = inp->inp_lport;
1217                                 src.sin_addr =
1218                                     *(struct in_addr *)CMSG_DATA(cm);
1219                                 break;
1220
1221                         case IP_TOS:
1222                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1223                                         error = EINVAL;
1224                                         break;
1225                                 }
1226                                 tos = *(u_char *)CMSG_DATA(cm);
1227                                 break;
1228
1229                         case IP_FLOWID:
1230                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1231                                         error = EINVAL;
1232                                         break;
1233                                 }
1234                                 flowid = *(uint32_t *) CMSG_DATA(cm);
1235                                 break;
1236
1237                         case IP_FLOWTYPE:
1238                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1239                                         error = EINVAL;
1240                                         break;
1241                                 }
1242                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
1243                                 break;
1244
1245 #ifdef  RSS
1246                         case IP_RSSBUCKETID:
1247                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1248                                         error = EINVAL;
1249                                         break;
1250                                 }
1251                                 /* This is just a placeholder for now */
1252                                 break;
1253 #endif  /* RSS */
1254                         default:
1255                                 error = ENOPROTOOPT;
1256                                 break;
1257                         }
1258                         if (error)
1259                                 break;
1260                 }
1261                 m_freem(control);
1262         }
1263         if (error) {
1264                 if (unlock_inp == UH_WLOCKED)
1265                         INP_WUNLOCK(inp);
1266                 else
1267                         INP_RUNLOCK(inp);
1268                 m_freem(m);
1269                 return (error);
1270         }
1271
1272         /*
1273          * Depending on whether or not the application has bound or connected
1274          * the socket, we may have to do varying levels of work.  The optimal
1275          * case is for a connected UDP socket, as a global lock isn't
1276          * required at all.
1277          *
1278          * In order to decide which we need, we require stability of the
1279          * inpcb binding, which we ensure by acquiring a read lock on the
1280          * inpcb.  This doesn't strictly follow the lock order, so we play
1281          * the trylock and retry game; note that we may end up with more
1282          * conservative locks than required the second time around, so later
1283          * assertions have to accept that.  Further analysis of the number of
1284          * misses under contention is required.
1285          *
1286          * XXXRW: Check that hash locking update here is correct.
1287          */
1288         pr = inp->inp_socket->so_proto->pr_protocol;
1289         pcbinfo = udp_get_inpcbinfo(pr);
1290         sin = (struct sockaddr_in *)addr;
1291         if (sin != NULL &&
1292             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
1293                 INP_HASH_WLOCK(pcbinfo);
1294                 unlock_udbinfo = UH_WLOCKED;
1295         } else if ((sin != NULL && (
1296             (sin->sin_addr.s_addr == INADDR_ANY) ||
1297             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
1298             (inp->inp_laddr.s_addr == INADDR_ANY) ||
1299             (inp->inp_lport == 0))) ||
1300             (src.sin_family == AF_INET)) {
1301                 INP_HASH_RLOCK(pcbinfo);
1302                 unlock_udbinfo = UH_RLOCKED;
1303         } else
1304                 unlock_udbinfo = UH_UNLOCKED;
1305
1306         /*
1307          * If the IP_SENDSRCADDR control message was specified, override the
1308          * source address for this datagram.  Its use is invalidated if the
1309          * address thus specified is incomplete or clobbers other inpcbs.
1310          */
1311         laddr = inp->inp_laddr;
1312         lport = inp->inp_lport;
1313         if (src.sin_family == AF_INET) {
1314                 INP_HASH_LOCK_ASSERT(pcbinfo);
1315                 if ((lport == 0) ||
1316                     (laddr.s_addr == INADDR_ANY &&
1317                      src.sin_addr.s_addr == INADDR_ANY)) {
1318                         error = EINVAL;
1319                         goto release;
1320                 }
1321                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
1322                     &laddr.s_addr, &lport, td->td_ucred);
1323                 if (error)
1324                         goto release;
1325         }
1326
1327         /*
1328          * If a UDP socket has been connected, then a local address/port will
1329          * have been selected and bound.
1330          *
1331          * If a UDP socket has not been connected to, then an explicit
1332          * destination address must be used, in which case a local
1333          * address/port may not have been selected and bound.
1334          */
1335         if (sin != NULL) {
1336                 INP_LOCK_ASSERT(inp);
1337                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1338                         error = EISCONN;
1339                         goto release;
1340                 }
1341
1342                 /*
1343                  * Jail may rewrite the destination address, so let it do
1344                  * that before we use it.
1345                  */
1346                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1347                 if (error)
1348                         goto release;
1349
1350                 /*
1351                  * If a local address or port hasn't yet been selected, or if
1352                  * the destination address needs to be rewritten due to using
1353                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
1354                  * to do the heavy lifting.  Once a port is selected, we
1355                  * commit the binding back to the socket; we also commit the
1356                  * binding of the address if in jail.
1357                  *
1358                  * If we already have a valid binding and we're not
1359                  * requesting a destination address rewrite, use a fast path.
1360                  */
1361                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
1362                     inp->inp_lport == 0 ||
1363                     sin->sin_addr.s_addr == INADDR_ANY ||
1364                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
1365                         INP_HASH_LOCK_ASSERT(pcbinfo);
1366                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
1367                             &lport, &faddr.s_addr, &fport, NULL,
1368                             td->td_ucred);
1369                         if (error)
1370                                 goto release;
1371
1372                         /*
1373                          * XXXRW: Why not commit the port if the address is
1374                          * !INADDR_ANY?
1375                          */
1376                         /* Commit the local port if newly assigned. */
1377                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
1378                             inp->inp_lport == 0) {
1379                                 INP_WLOCK_ASSERT(inp);
1380                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
1381                                 /*
1382                                  * Remember addr if jailed, to prevent
1383                                  * rebinding.
1384                                  */
1385                                 if (prison_flag(td->td_ucred, PR_IP4))
1386                                         inp->inp_laddr = laddr;
1387                                 inp->inp_lport = lport;
1388                                 if (in_pcbinshash(inp) != 0) {
1389                                         inp->inp_lport = 0;
1390                                         error = EAGAIN;
1391                                         goto release;
1392                                 }
1393                                 inp->inp_flags |= INP_ANONPORT;
1394                         }
1395                 } else {
1396                         faddr = sin->sin_addr;
1397                         fport = sin->sin_port;
1398                 }
1399         } else {
1400                 INP_LOCK_ASSERT(inp);
1401                 faddr = inp->inp_faddr;
1402                 fport = inp->inp_fport;
1403                 if (faddr.s_addr == INADDR_ANY) {
1404                         error = ENOTCONN;
1405                         goto release;
1406                 }
1407         }
1408
1409         /*
1410          * Calculate data length and get a mbuf for UDP, IP, and possible
1411          * link-layer headers.  Immediate slide the data pointer back forward
1412          * since we won't use that space at this layer.
1413          */
1414         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1415         if (m == NULL) {
1416                 error = ENOBUFS;
1417                 goto release;
1418         }
1419         m->m_data += max_linkhdr;
1420         m->m_len -= max_linkhdr;
1421         m->m_pkthdr.len -= max_linkhdr;
1422
1423         /*
1424          * Fill in mbuf with extended UDP header and addresses and length put
1425          * into network format.
1426          */
1427         ui = mtod(m, struct udpiphdr *);
1428         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
1429         ui->ui_pr = pr;
1430         ui->ui_src = laddr;
1431         ui->ui_dst = faddr;
1432         ui->ui_sport = lport;
1433         ui->ui_dport = fport;
1434         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1435         if (pr == IPPROTO_UDPLITE) {
1436                 struct udpcb *up;
1437                 uint16_t plen;
1438
1439                 up = intoudpcb(inp);
1440                 cscov = up->u_txcslen;
1441                 plen = (u_short)len + sizeof(struct udphdr);
1442                 if (cscov >= plen)
1443                         cscov = 0;
1444                 ui->ui_len = htons(plen);
1445                 ui->ui_ulen = htons(cscov);
1446                 /*
1447                  * For UDP-Lite, checksum coverage length of zero means
1448                  * the entire UDPLite packet is covered by the checksum.
1449                  */
1450                 cscov_partial = (cscov == 0) ? 0 : 1;
1451         } else
1452                 ui->ui_v = IPVERSION << 4;
1453
1454         /*
1455          * Set the Don't Fragment bit in the IP header.
1456          */
1457         if (inp->inp_flags & INP_DONTFRAG) {
1458                 struct ip *ip;
1459
1460                 ip = (struct ip *)&ui->ui_i;
1461                 ip->ip_off |= htons(IP_DF);
1462         }
1463
1464         ipflags = 0;
1465         if (inp->inp_socket->so_options & SO_DONTROUTE)
1466                 ipflags |= IP_ROUTETOIF;
1467         if (inp->inp_socket->so_options & SO_BROADCAST)
1468                 ipflags |= IP_ALLOWBROADCAST;
1469         if (inp->inp_flags & INP_ONESBCAST)
1470                 ipflags |= IP_SENDONES;
1471
1472 #ifdef MAC
1473         mac_inpcb_create_mbuf(inp, m);
1474 #endif
1475
1476         /*
1477          * Set up checksum and output datagram.
1478          */
1479         ui->ui_sum = 0;
1480         if (pr == IPPROTO_UDPLITE) {
1481                 if (inp->inp_flags & INP_ONESBCAST)
1482                         faddr.s_addr = INADDR_BROADCAST;
1483                 if (cscov_partial) {
1484                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1485                                 ui->ui_sum = 0xffff;
1486                 } else {
1487                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1488                                 ui->ui_sum = 0xffff;
1489                 }
1490         } else if (V_udp_cksum) {
1491                 if (inp->inp_flags & INP_ONESBCAST)
1492                         faddr.s_addr = INADDR_BROADCAST;
1493                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1494                     htons((u_short)len + sizeof(struct udphdr) + pr));
1495                 m->m_pkthdr.csum_flags = CSUM_UDP;
1496                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1497         }
1498         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1499         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
1500         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
1501         UDPSTAT_INC(udps_opackets);
1502
1503         /*
1504          * Setup flowid / RSS information for outbound socket.
1505          *
1506          * Once the UDP code decides to set a flowid some other way,
1507          * this allows the flowid to be overridden by userland.
1508          */
1509         if (flowtype != M_HASHTYPE_NONE) {
1510                 m->m_pkthdr.flowid = flowid;
1511                 M_HASHTYPE_SET(m, flowtype);
1512 #ifdef  RSS
1513         } else {
1514                 uint32_t hash_val, hash_type;
1515                 /*
1516                  * Calculate an appropriate RSS hash for UDP and
1517                  * UDP Lite.
1518                  *
1519                  * The called function will take care of figuring out
1520                  * whether a 2-tuple or 4-tuple hash is required based
1521                  * on the currently configured scheme.
1522                  *
1523                  * Later later on connected socket values should be
1524                  * cached in the inpcb and reused, rather than constantly
1525                  * re-calculating it.
1526                  *
1527                  * UDP Lite is a different protocol number and will
1528                  * likely end up being hashed as a 2-tuple until
1529                  * RSS / NICs grow UDP Lite protocol awareness.
1530                  */
1531                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
1532                     pr, &hash_val, &hash_type) == 0) {
1533                         m->m_pkthdr.flowid = hash_val;
1534                         M_HASHTYPE_SET(m, hash_type);
1535                 }
1536 #endif
1537         }
1538
1539 #ifdef  RSS
1540         /*
1541          * Don't override with the inp cached flowid value.
1542          *
1543          * Depending upon the kind of send being done, the inp
1544          * flowid/flowtype values may actually not be appropriate
1545          * for this particular socket send.
1546          *
1547          * We should either leave the flowid at zero (which is what is
1548          * currently done) or set it to some software generated
1549          * hash value based on the packet contents.
1550          */
1551         ipflags |= IP_NODEFAULTFLOWID;
1552 #endif  /* RSS */
1553
1554         if (unlock_udbinfo == UH_WLOCKED)
1555                 INP_HASH_WUNLOCK(pcbinfo);
1556         else if (unlock_udbinfo == UH_RLOCKED)
1557                 INP_HASH_RUNLOCK(pcbinfo);
1558         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1559         error = ip_output(m, inp->inp_options,
1560             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
1561             inp->inp_moptions, inp);
1562         if (unlock_inp == UH_WLOCKED)
1563                 INP_WUNLOCK(inp);
1564         else
1565                 INP_RUNLOCK(inp);
1566         return (error);
1567
1568 release:
1569         if (unlock_udbinfo == UH_WLOCKED) {
1570                 INP_HASH_WUNLOCK(pcbinfo);
1571                 INP_WUNLOCK(inp);
1572         } else if (unlock_udbinfo == UH_RLOCKED) {
1573                 INP_HASH_RUNLOCK(pcbinfo);
1574                 INP_RUNLOCK(inp);
1575         } else
1576                 INP_RUNLOCK(inp);
1577         m_freem(m);
1578         return (error);
1579 }
1580
1581
1582 #if defined(IPSEC) && defined(IPSEC_NAT_T)
1583 /*
1584  * Potentially decap ESP in UDP frame.  Check for an ESP header
1585  * and optional marker; if present, strip the UDP header and
1586  * push the result through IPSec.
1587  *
1588  * Returns mbuf to be processed (potentially re-allocated) or
1589  * NULL if consumed and/or processed.
1590  */
1591 static struct mbuf *
1592 udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off)
1593 {
1594         size_t minlen, payload, skip, iphlen;
1595         caddr_t data;
1596         struct udpcb *up;
1597         struct m_tag *tag;
1598         struct udphdr *udphdr;
1599         struct ip *ip;
1600
1601         INP_RLOCK_ASSERT(inp);
1602
1603         /*
1604          * Pull up data so the longest case is contiguous:
1605          *    IP/UDP hdr + non ESP marker + ESP hdr.
1606          */
1607         minlen = off + sizeof(uint64_t) + sizeof(struct esp);
1608         if (minlen > m->m_pkthdr.len)
1609                 minlen = m->m_pkthdr.len;
1610         if ((m = m_pullup(m, minlen)) == NULL) {
1611                 IPSECSTAT_INC(ips_in_inval);
1612                 return (NULL);          /* Bypass caller processing. */
1613         }
1614         data = mtod(m, caddr_t);        /* Points to ip header. */
1615         payload = m->m_len - off;       /* Size of payload. */
1616
1617         if (payload == 1 && data[off] == '\xff')
1618                 return (m);             /* NB: keepalive packet, no decap. */
1619
1620         up = intoudpcb(inp);
1621         KASSERT(up != NULL, ("%s: udpcb NULL", __func__));
1622         KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0,
1623             ("u_flags 0x%x", up->u_flags));
1624
1625         /*
1626          * Check that the payload is large enough to hold an
1627          * ESP header and compute the amount of data to remove.
1628          *
1629          * NB: the caller has already done a pullup for us.
1630          * XXX can we assume alignment and eliminate bcopys?
1631          */
1632         if (up->u_flags & UF_ESPINUDP_NON_IKE) {
1633                 /*
1634                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
1635                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring
1636                  * possible AH mode non-IKE marker+non-ESP marker
1637                  * from draft-ietf-ipsec-udp-encaps-00.txt.
1638                  */
1639                 uint64_t marker;
1640
1641                 if (payload <= sizeof(uint64_t) + sizeof(struct esp))
1642                         return (m);     /* NB: no decap. */
1643                 bcopy(data + off, &marker, sizeof(uint64_t));
1644                 if (marker != 0)        /* Non-IKE marker. */
1645                         return (m);     /* NB: no decap. */
1646                 skip = sizeof(uint64_t) + sizeof(struct udphdr);
1647         } else {
1648                 uint32_t spi;
1649
1650                 if (payload <= sizeof(struct esp)) {
1651                         IPSECSTAT_INC(ips_in_inval);
1652                         m_freem(m);
1653                         return (NULL);  /* Discard. */
1654                 }
1655                 bcopy(data + off, &spi, sizeof(uint32_t));
1656                 if (spi == 0)           /* Non-ESP marker. */
1657                         return (m);     /* NB: no decap. */
1658                 skip = sizeof(struct udphdr);
1659         }
1660
1661         /*
1662          * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
1663          * the UDP ports. This is required if we want to select
1664          * the right SPD for multiple hosts behind same NAT.
1665          *
1666          * NB: ports are maintained in network byte order everywhere
1667          *     in the NAT-T code.
1668          */
1669         tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
1670                 2 * sizeof(uint16_t), M_NOWAIT);
1671         if (tag == NULL) {
1672                 IPSECSTAT_INC(ips_in_nomem);
1673                 m_freem(m);
1674                 return (NULL);          /* Discard. */
1675         }
1676         iphlen = off - sizeof(struct udphdr);
1677         udphdr = (struct udphdr *)(data + iphlen);
1678         ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport;
1679         ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport;
1680         m_tag_prepend(m, tag);
1681
1682         /*
1683          * Remove the UDP header (and possibly the non ESP marker)
1684          * IP header length is iphlen
1685          * Before:
1686          *   <--- off --->
1687          *   +----+------+-----+
1688          *   | IP |  UDP | ESP |
1689          *   +----+------+-----+
1690          *        <-skip->
1691          * After:
1692          *          +----+-----+
1693          *          | IP | ESP |
1694          *          +----+-----+
1695          *   <-skip->
1696          */
1697         ovbcopy(data, data + skip, iphlen);
1698         m_adj(m, skip);
1699
1700         ip = mtod(m, struct ip *);
1701         ip->ip_len = htons(ntohs(ip->ip_len) - skip);
1702         ip->ip_p = IPPROTO_ESP;
1703
1704         /*
1705          * We cannot yet update the cksums so clear any
1706          * h/w cksum flags as they are no longer valid.
1707          */
1708         if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
1709                 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
1710
1711         (void) ipsec_common_input(m, iphlen, offsetof(struct ip, ip_p),
1712                                 AF_INET, ip->ip_p);
1713         return (NULL);                  /* NB: consumed, bypass processing. */
1714 }
1715 #endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */
1716
1717 static void
1718 udp_abort(struct socket *so)
1719 {
1720         struct inpcb *inp;
1721         struct inpcbinfo *pcbinfo;
1722
1723         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1724         inp = sotoinpcb(so);
1725         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1726         INP_WLOCK(inp);
1727         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1728                 INP_HASH_WLOCK(pcbinfo);
1729                 in_pcbdisconnect(inp);
1730                 inp->inp_laddr.s_addr = INADDR_ANY;
1731                 INP_HASH_WUNLOCK(pcbinfo);
1732                 soisdisconnected(so);
1733         }
1734         INP_WUNLOCK(inp);
1735 }
1736
1737 static int
1738 udp_attach(struct socket *so, int proto, struct thread *td)
1739 {
1740         struct inpcb *inp;
1741         struct inpcbinfo *pcbinfo;
1742         int error;
1743
1744         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1745         inp = sotoinpcb(so);
1746         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1747         error = soreserve(so, udp_sendspace, udp_recvspace);
1748         if (error)
1749                 return (error);
1750         INP_INFO_WLOCK(pcbinfo);
1751         error = in_pcballoc(so, pcbinfo);
1752         if (error) {
1753                 INP_INFO_WUNLOCK(pcbinfo);
1754                 return (error);
1755         }
1756
1757         inp = sotoinpcb(so);
1758         inp->inp_vflag |= INP_IPV4;
1759         inp->inp_ip_ttl = V_ip_defttl;
1760
1761         error = udp_newudpcb(inp);
1762         if (error) {
1763                 in_pcbdetach(inp);
1764                 in_pcbfree(inp);
1765                 INP_INFO_WUNLOCK(pcbinfo);
1766                 return (error);
1767         }
1768
1769         INP_WUNLOCK(inp);
1770         INP_INFO_WUNLOCK(pcbinfo);
1771         return (0);
1772 }
1773 #endif /* INET */
1774
1775 int
1776 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1777 {
1778         struct inpcb *inp;
1779         struct udpcb *up;
1780
1781         KASSERT(so->so_type == SOCK_DGRAM,
1782             ("udp_set_kernel_tunneling: !dgram"));
1783         inp = sotoinpcb(so);
1784         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1785         INP_WLOCK(inp);
1786         up = intoudpcb(inp);
1787         if ((up->u_tun_func != NULL) ||
1788             (up->u_icmp_func != NULL)) {
1789                 INP_WUNLOCK(inp);
1790                 return (EBUSY);
1791         }
1792         up->u_tun_func = f;
1793         up->u_icmp_func = i;
1794         up->u_tun_ctx = ctx;
1795         INP_WUNLOCK(inp);
1796         return (0);
1797 }
1798
1799 #ifdef INET
1800 static int
1801 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1802 {
1803         struct inpcb *inp;
1804         struct inpcbinfo *pcbinfo;
1805         int error;
1806
1807         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1808         inp = sotoinpcb(so);
1809         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1810         INP_WLOCK(inp);
1811         INP_HASH_WLOCK(pcbinfo);
1812         error = in_pcbbind(inp, nam, td->td_ucred);
1813         INP_HASH_WUNLOCK(pcbinfo);
1814         INP_WUNLOCK(inp);
1815         return (error);
1816 }
1817
1818 static void
1819 udp_close(struct socket *so)
1820 {
1821         struct inpcb *inp;
1822         struct inpcbinfo *pcbinfo;
1823
1824         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1825         inp = sotoinpcb(so);
1826         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1827         INP_WLOCK(inp);
1828         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1829                 INP_HASH_WLOCK(pcbinfo);
1830                 in_pcbdisconnect(inp);
1831                 inp->inp_laddr.s_addr = INADDR_ANY;
1832                 INP_HASH_WUNLOCK(pcbinfo);
1833                 soisdisconnected(so);
1834         }
1835         INP_WUNLOCK(inp);
1836 }
1837
1838 static int
1839 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1840 {
1841         struct inpcb *inp;
1842         struct inpcbinfo *pcbinfo;
1843         struct sockaddr_in *sin;
1844         int error;
1845
1846         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1847         inp = sotoinpcb(so);
1848         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1849         INP_WLOCK(inp);
1850         if (inp->inp_faddr.s_addr != INADDR_ANY) {
1851                 INP_WUNLOCK(inp);
1852                 return (EISCONN);
1853         }
1854         sin = (struct sockaddr_in *)nam;
1855         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1856         if (error != 0) {
1857                 INP_WUNLOCK(inp);
1858                 return (error);
1859         }
1860         INP_HASH_WLOCK(pcbinfo);
1861         error = in_pcbconnect(inp, nam, td->td_ucred);
1862         INP_HASH_WUNLOCK(pcbinfo);
1863         if (error == 0)
1864                 soisconnected(so);
1865         INP_WUNLOCK(inp);
1866         return (error);
1867 }
1868
1869 static void
1870 udp_detach(struct socket *so)
1871 {
1872         struct inpcb *inp;
1873         struct inpcbinfo *pcbinfo;
1874         struct udpcb *up;
1875
1876         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1877         inp = sotoinpcb(so);
1878         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1879         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1880             ("udp_detach: not disconnected"));
1881         INP_INFO_WLOCK(pcbinfo);
1882         INP_WLOCK(inp);
1883         up = intoudpcb(inp);
1884         KASSERT(up != NULL, ("%s: up == NULL", __func__));
1885         inp->inp_ppcb = NULL;
1886         in_pcbdetach(inp);
1887         in_pcbfree(inp);
1888         INP_INFO_WUNLOCK(pcbinfo);
1889         udp_discardcb(up);
1890 }
1891
1892 static int
1893 udp_disconnect(struct socket *so)
1894 {
1895         struct inpcb *inp;
1896         struct inpcbinfo *pcbinfo;
1897
1898         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1899         inp = sotoinpcb(so);
1900         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1901         INP_WLOCK(inp);
1902         if (inp->inp_faddr.s_addr == INADDR_ANY) {
1903                 INP_WUNLOCK(inp);
1904                 return (ENOTCONN);
1905         }
1906         INP_HASH_WLOCK(pcbinfo);
1907         in_pcbdisconnect(inp);
1908         inp->inp_laddr.s_addr = INADDR_ANY;
1909         INP_HASH_WUNLOCK(pcbinfo);
1910         SOCK_LOCK(so);
1911         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
1912         SOCK_UNLOCK(so);
1913         INP_WUNLOCK(inp);
1914         return (0);
1915 }
1916
1917 static int
1918 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1919     struct mbuf *control, struct thread *td)
1920 {
1921         struct inpcb *inp;
1922
1923         inp = sotoinpcb(so);
1924         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1925         return (udp_output(inp, m, addr, control, td));
1926 }
1927 #endif /* INET */
1928
1929 int
1930 udp_shutdown(struct socket *so)
1931 {
1932         struct inpcb *inp;
1933
1934         inp = sotoinpcb(so);
1935         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
1936         INP_WLOCK(inp);
1937         socantsendmore(so);
1938         INP_WUNLOCK(inp);
1939         return (0);
1940 }
1941
1942 #ifdef INET
1943 struct pr_usrreqs udp_usrreqs = {
1944         .pru_abort =            udp_abort,
1945         .pru_attach =           udp_attach,
1946         .pru_bind =             udp_bind,
1947         .pru_connect =          udp_connect,
1948         .pru_control =          in_control,
1949         .pru_detach =           udp_detach,
1950         .pru_disconnect =       udp_disconnect,
1951         .pru_peeraddr =         in_getpeeraddr,
1952         .pru_send =             udp_send,
1953         .pru_soreceive =        soreceive_dgram,
1954         .pru_sosend =           sosend_dgram,
1955         .pru_shutdown =         udp_shutdown,
1956         .pru_sockaddr =         in_getsockaddr,
1957         .pru_sosetlabel =       in_pcbsosetlabel,
1958         .pru_close =            udp_close,
1959 };
1960 #endif /* INET */