The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/udp_usrreq.c

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    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: releng/11.1/sys/netinet/udp_usrreq.c 315514 2017-03-18 22:04:20Z ae $");
   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 #include <netipsec/ipsec_support.h>
   96 
   97 #include <machine/in_cksum.h>
   98 
   99 #include <security/mac/mac_framework.h>
  100 
  101 /*
  102  * UDP and UDP-Lite protocols implementation.
  103  * Per RFC 768, August, 1980.
  104  * Per RFC 3828, July, 2004.
  105  */
  106 
  107 /*
  108  * BSD 4.2 defaulted the udp checksum to be off.  Turning off udp checksums
  109  * removes the only data integrity mechanism for packets and malformed
  110  * packets that would otherwise be discarded due to bad checksums, and may
  111  * cause problems (especially for NFS data blocks).
  112  */
  113 VNET_DEFINE(int, udp_cksum) = 1;
  114 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
  115     &VNET_NAME(udp_cksum), 0, "compute udp checksum");
  116 
  117 int     udp_log_in_vain = 0;
  118 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
  119     &udp_log_in_vain, 0, "Log all incoming UDP packets");
  120 
  121 VNET_DEFINE(int, udp_blackhole) = 0;
  122 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
  123     &VNET_NAME(udp_blackhole), 0,
  124     "Do not send port unreachables for refused connects");
  125 
  126 u_long  udp_sendspace = 9216;           /* really max datagram size */
  127 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
  128     &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
  129 
  130 u_long  udp_recvspace = 40 * (1024 +
  131 #ifdef INET6
  132                                       sizeof(struct sockaddr_in6)
  133 #else
  134                                       sizeof(struct sockaddr_in)
  135 #endif
  136                                       );        /* 40 1K datagrams */
  137 
  138 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
  139     &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
  140 
  141 VNET_DEFINE(struct inpcbhead, udb);             /* from udp_var.h */
  142 VNET_DEFINE(struct inpcbinfo, udbinfo);
  143 VNET_DEFINE(struct inpcbhead, ulitecb);
  144 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
  145 static VNET_DEFINE(uma_zone_t, udpcb_zone);
  146 #define V_udpcb_zone                    VNET(udpcb_zone)
  147 
  148 #ifndef UDBHASHSIZE
  149 #define UDBHASHSIZE     128
  150 #endif
  151 
  152 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat);          /* from udp_var.h */
  153 VNET_PCPUSTAT_SYSINIT(udpstat);
  154 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
  155     udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
  156 
  157 #ifdef VIMAGE
  158 VNET_PCPUSTAT_SYSUNINIT(udpstat);
  159 #endif /* VIMAGE */
  160 #ifdef INET
  161 static void     udp_detach(struct socket *so);
  162 static int      udp_output(struct inpcb *, struct mbuf *, struct sockaddr *,
  163                     struct mbuf *, struct thread *);
  164 #endif
  165 
  166 static void
  167 udp_zone_change(void *tag)
  168 {
  169 
  170         uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets);
  171         uma_zone_set_max(V_udpcb_zone, maxsockets);
  172 }
  173 
  174 static int
  175 udp_inpcb_init(void *mem, int size, int flags)
  176 {
  177         struct inpcb *inp;
  178 
  179         inp = mem;
  180         INP_LOCK_INIT(inp, "inp", "udpinp");
  181         return (0);
  182 }
  183 
  184 static int
  185 udplite_inpcb_init(void *mem, int size, int flags)
  186 {
  187         struct inpcb *inp;
  188 
  189         inp = mem;
  190         INP_LOCK_INIT(inp, "inp", "udpliteinp");
  191         return (0);
  192 }
  193 
  194 void
  195 udp_init(void)
  196 {
  197 
  198         /*
  199          * For now default to 2-tuple UDP hashing - until the fragment
  200          * reassembly code can also update the flowid.
  201          *
  202          * Once we can calculate the flowid that way and re-establish
  203          * a 4-tuple, flip this to 4-tuple.
  204          */
  205         in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE,
  206             "udp_inpcb", udp_inpcb_init, NULL, 0,
  207             IPI_HASHFIELDS_2TUPLE);
  208         V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb),
  209             NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
  210         uma_zone_set_max(V_udpcb_zone, maxsockets);
  211         uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached");
  212         EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL,
  213             EVENTHANDLER_PRI_ANY);
  214 }
  215 
  216 void
  217 udplite_init(void)
  218 {
  219 
  220         in_pcbinfo_init(&V_ulitecbinfo, "udplite", &V_ulitecb, UDBHASHSIZE,
  221             UDBHASHSIZE, "udplite_inpcb", udplite_inpcb_init, NULL,
  222             0, IPI_HASHFIELDS_2TUPLE);
  223 }
  224 
  225 /*
  226  * Kernel module interface for updating udpstat.  The argument is an index
  227  * into udpstat treated as an array of u_long.  While this encodes the
  228  * general layout of udpstat into the caller, it doesn't encode its location,
  229  * so that future changes to add, for example, per-CPU stats support won't
  230  * cause binary compatibility problems for kernel modules.
  231  */
  232 void
  233 kmod_udpstat_inc(int statnum)
  234 {
  235 
  236         counter_u64_add(VNET(udpstat)[statnum], 1);
  237 }
  238 
  239 int
  240 udp_newudpcb(struct inpcb *inp)
  241 {
  242         struct udpcb *up;
  243 
  244         up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO);
  245         if (up == NULL)
  246                 return (ENOBUFS);
  247         inp->inp_ppcb = up;
  248         return (0);
  249 }
  250 
  251 void
  252 udp_discardcb(struct udpcb *up)
  253 {
  254 
  255         uma_zfree(V_udpcb_zone, up);
  256 }
  257 
  258 #ifdef VIMAGE
  259 static void
  260 udp_destroy(void *unused __unused)
  261 {
  262 
  263         in_pcbinfo_destroy(&V_udbinfo);
  264         uma_zdestroy(V_udpcb_zone);
  265 }
  266 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
  267 
  268 static void
  269 udplite_destroy(void *unused __unused)
  270 {
  271 
  272         in_pcbinfo_destroy(&V_ulitecbinfo);
  273 }
  274 VNET_SYSUNINIT(udplite, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udplite_destroy,
  275     NULL);
  276 #endif
  277 
  278 #ifdef INET
  279 /*
  280  * Subroutine of udp_input(), which appends the provided mbuf chain to the
  281  * passed pcb/socket.  The caller must provide a sockaddr_in via udp_in that
  282  * contains the source address.  If the socket ends up being an IPv6 socket,
  283  * udp_append() will convert to a sockaddr_in6 before passing the address
  284  * into the socket code.
  285  *
  286  * In the normal case udp_append() will return 0, indicating that you
  287  * must unlock the inp. However if a tunneling protocol is in place we increment
  288  * the inpcb refcnt and unlock the inp, on return from the tunneling protocol we
  289  * then decrement the reference count. If the inp_rele returns 1, indicating the
  290  * inp is gone, we return that to the caller to tell them *not* to unlock
  291  * the inp. In the case of multi-cast this will cause the distribution
  292  * to stop (though most tunneling protocols known currently do *not* use
  293  * multicast).
  294  */
  295 static int
  296 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
  297     struct sockaddr_in *udp_in)
  298 {
  299         struct sockaddr *append_sa;
  300         struct socket *so;
  301         struct mbuf *opts = NULL;
  302 #ifdef INET6
  303         struct sockaddr_in6 udp_in6;
  304 #endif
  305         struct udpcb *up;
  306 
  307         INP_LOCK_ASSERT(inp);
  308 
  309         /*
  310          * Engage the tunneling protocol.
  311          */
  312         up = intoudpcb(inp);
  313         if (up->u_tun_func != NULL) {
  314                 in_pcbref(inp);
  315                 INP_RUNLOCK(inp);
  316                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)udp_in,
  317                     up->u_tun_ctx);
  318                 INP_RLOCK(inp);
  319                 return (in_pcbrele_rlocked(inp));
  320         }
  321 
  322         off += sizeof(struct udphdr);
  323 
  324 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  325         /* Check AH/ESP integrity. */
  326         if (IPSEC_ENABLED(ipv4) &&
  327             IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
  328                 m_freem(n);
  329                 return (0);
  330         }
  331         if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
  332                 if (IPSEC_ENABLED(ipv4) &&
  333                     UDPENCAP_INPUT(n, off, AF_INET) != 0)
  334                         return (0);     /* Consumed. */
  335         }
  336 #endif /* IPSEC */
  337 #ifdef MAC
  338         if (mac_inpcb_check_deliver(inp, n) != 0) {
  339                 m_freem(n);
  340                 return (0);
  341         }
  342 #endif /* MAC */
  343         if (inp->inp_flags & INP_CONTROLOPTS ||
  344             inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
  345 #ifdef INET6
  346                 if (inp->inp_vflag & INP_IPV6)
  347                         (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
  348                 else
  349 #endif /* INET6 */
  350                         ip_savecontrol(inp, &opts, ip, n);
  351         }
  352 #ifdef INET6
  353         if (inp->inp_vflag & INP_IPV6) {
  354                 bzero(&udp_in6, sizeof(udp_in6));
  355                 udp_in6.sin6_len = sizeof(udp_in6);
  356                 udp_in6.sin6_family = AF_INET6;
  357                 in6_sin_2_v4mapsin6(udp_in, &udp_in6);
  358                 append_sa = (struct sockaddr *)&udp_in6;
  359         } else
  360 #endif /* INET6 */
  361                 append_sa = (struct sockaddr *)udp_in;
  362         m_adj(n, off);
  363 
  364         so = inp->inp_socket;
  365         SOCKBUF_LOCK(&so->so_rcv);
  366         if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
  367                 SOCKBUF_UNLOCK(&so->so_rcv);
  368                 m_freem(n);
  369                 if (opts)
  370                         m_freem(opts);
  371                 UDPSTAT_INC(udps_fullsock);
  372         } else
  373                 sorwakeup_locked(so);
  374         return (0);
  375 }
  376 
  377 int
  378 udp_input(struct mbuf **mp, int *offp, int proto)
  379 {
  380         struct ip *ip;
  381         struct udphdr *uh;
  382         struct ifnet *ifp;
  383         struct inpcb *inp;
  384         uint16_t len, ip_len;
  385         struct inpcbinfo *pcbinfo;
  386         struct ip save_ip;
  387         struct sockaddr_in udp_in;
  388         struct mbuf *m;
  389         struct m_tag *fwd_tag;
  390         int cscov_partial, iphlen;
  391 
  392         m = *mp;
  393         iphlen = *offp;
  394         ifp = m->m_pkthdr.rcvif;
  395         *mp = NULL;
  396         UDPSTAT_INC(udps_ipackets);
  397 
  398         /*
  399          * Strip IP options, if any; should skip this, make available to
  400          * user, and use on returned packets, but we don't yet have a way to
  401          * check the checksum with options still present.
  402          */
  403         if (iphlen > sizeof (struct ip)) {
  404                 ip_stripoptions(m);
  405                 iphlen = sizeof(struct ip);
  406         }
  407 
  408         /*
  409          * Get IP and UDP header together in first mbuf.
  410          */
  411         ip = mtod(m, struct ip *);
  412         if (m->m_len < iphlen + sizeof(struct udphdr)) {
  413                 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
  414                         UDPSTAT_INC(udps_hdrops);
  415                         return (IPPROTO_DONE);
  416                 }
  417                 ip = mtod(m, struct ip *);
  418         }
  419         uh = (struct udphdr *)((caddr_t)ip + iphlen);
  420         cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
  421 
  422         /*
  423          * Destination port of 0 is illegal, based on RFC768.
  424          */
  425         if (uh->uh_dport == 0)
  426                 goto badunlocked;
  427 
  428         /*
  429          * Construct sockaddr format source address.  Stuff source address
  430          * and datagram in user buffer.
  431          */
  432         bzero(&udp_in, sizeof(udp_in));
  433         udp_in.sin_len = sizeof(udp_in);
  434         udp_in.sin_family = AF_INET;
  435         udp_in.sin_port = uh->uh_sport;
  436         udp_in.sin_addr = ip->ip_src;
  437 
  438         /*
  439          * Make mbuf data length reflect UDP length.  If not enough data to
  440          * reflect UDP length, drop.
  441          */
  442         len = ntohs((u_short)uh->uh_ulen);
  443         ip_len = ntohs(ip->ip_len) - iphlen;
  444         if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
  445                 /* Zero means checksum over the complete packet. */
  446                 if (len == 0)
  447                         len = ip_len;
  448                 cscov_partial = 0;
  449         }
  450         if (ip_len != len) {
  451                 if (len > ip_len || len < sizeof(struct udphdr)) {
  452                         UDPSTAT_INC(udps_badlen);
  453                         goto badunlocked;
  454                 }
  455                 if (proto == IPPROTO_UDP)
  456                         m_adj(m, len - ip_len);
  457         }
  458 
  459         /*
  460          * Save a copy of the IP header in case we want restore it for
  461          * sending an ICMP error message in response.
  462          */
  463         if (!V_udp_blackhole)
  464                 save_ip = *ip;
  465         else
  466                 memset(&save_ip, 0, sizeof(save_ip));
  467 
  468         /*
  469          * Checksum extended UDP header and data.
  470          */
  471         if (uh->uh_sum) {
  472                 u_short uh_sum;
  473 
  474                 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
  475                     !cscov_partial) {
  476                         if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
  477                                 uh_sum = m->m_pkthdr.csum_data;
  478                         else
  479                                 uh_sum = in_pseudo(ip->ip_src.s_addr,
  480                                     ip->ip_dst.s_addr, htonl((u_short)len +
  481                                     m->m_pkthdr.csum_data + proto));
  482                         uh_sum ^= 0xffff;
  483                 } else {
  484                         char b[9];
  485 
  486                         bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
  487                         bzero(((struct ipovly *)ip)->ih_x1, 9);
  488                         ((struct ipovly *)ip)->ih_len = (proto == IPPROTO_UDP) ?
  489                             uh->uh_ulen : htons(ip_len);
  490                         uh_sum = in_cksum(m, len + sizeof (struct ip));
  491                         bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
  492                 }
  493                 if (uh_sum) {
  494                         UDPSTAT_INC(udps_badsum);
  495                         m_freem(m);
  496                         return (IPPROTO_DONE);
  497                 }
  498         } else {
  499                 if (proto == IPPROTO_UDP) {
  500                         UDPSTAT_INC(udps_nosum);
  501                 } else {
  502                         /* UDPLite requires a checksum */
  503                         /* XXX: What is the right UDPLite MIB counter here? */
  504                         m_freem(m);
  505                         return (IPPROTO_DONE);
  506                 }
  507         }
  508 
  509         pcbinfo = udp_get_inpcbinfo(proto);
  510         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
  511             in_broadcast(ip->ip_dst, ifp)) {
  512                 struct inpcb *last;
  513                 struct inpcbhead *pcblist;
  514                 struct ip_moptions *imo;
  515 
  516                 INP_INFO_RLOCK(pcbinfo);
  517                 pcblist = udp_get_pcblist(proto);
  518                 last = NULL;
  519                 LIST_FOREACH(inp, pcblist, inp_list) {
  520                         if (inp->inp_lport != uh->uh_dport)
  521                                 continue;
  522 #ifdef INET6
  523                         if ((inp->inp_vflag & INP_IPV4) == 0)
  524                                 continue;
  525 #endif
  526                         if (inp->inp_laddr.s_addr != INADDR_ANY &&
  527                             inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
  528                                 continue;
  529                         if (inp->inp_faddr.s_addr != INADDR_ANY &&
  530                             inp->inp_faddr.s_addr != ip->ip_src.s_addr)
  531                                 continue;
  532                         if (inp->inp_fport != 0 &&
  533                             inp->inp_fport != uh->uh_sport)
  534                                 continue;
  535 
  536                         INP_RLOCK(inp);
  537 
  538                         /*
  539                          * XXXRW: Because we weren't holding either the inpcb
  540                          * or the hash lock when we checked for a match
  541                          * before, we should probably recheck now that the
  542                          * inpcb lock is held.
  543                          */
  544 
  545                         /*
  546                          * Handle socket delivery policy for any-source
  547                          * and source-specific multicast. [RFC3678]
  548                          */
  549                         imo = inp->inp_moptions;
  550                         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
  551                                 struct sockaddr_in       group;
  552                                 int                      blocked;
  553                                 if (imo == NULL) {
  554                                         INP_RUNLOCK(inp);
  555                                         continue;
  556                                 }
  557                                 bzero(&group, sizeof(struct sockaddr_in));
  558                                 group.sin_len = sizeof(struct sockaddr_in);
  559                                 group.sin_family = AF_INET;
  560                                 group.sin_addr = ip->ip_dst;
  561 
  562                                 blocked = imo_multi_filter(imo, ifp,
  563                                         (struct sockaddr *)&group,
  564                                         (struct sockaddr *)&udp_in);
  565                                 if (blocked != MCAST_PASS) {
  566                                         if (blocked == MCAST_NOTGMEMBER)
  567                                                 IPSTAT_INC(ips_notmember);
  568                                         if (blocked == MCAST_NOTSMEMBER ||
  569                                             blocked == MCAST_MUTED)
  570                                                 UDPSTAT_INC(udps_filtermcast);
  571                                         INP_RUNLOCK(inp);
  572                                         continue;
  573                                 }
  574                         }
  575                         if (last != NULL) {
  576                                 struct mbuf *n;
  577 
  578                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
  579                                         UDP_PROBE(receive, NULL, last, ip,
  580                                             last, uh);
  581                                         if (udp_append(last, ip, n, iphlen,
  582                                                 &udp_in)) {
  583                                                 goto inp_lost;
  584                                         }
  585                                 }
  586                                 INP_RUNLOCK(last);
  587                         }
  588                         last = inp;
  589                         /*
  590                          * Don't look for additional matches if this one does
  591                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  592                          * socket options set.  This heuristic avoids
  593                          * searching through all pcbs in the common case of a
  594                          * non-shared port.  It assumes that an application
  595                          * will never clear these options after setting them.
  596                          */
  597                         if ((last->inp_socket->so_options &
  598                             (SO_REUSEPORT|SO_REUSEADDR)) == 0)
  599                                 break;
  600                 }
  601 
  602                 if (last == NULL) {
  603                         /*
  604                          * No matching pcb found; discard datagram.  (No need
  605                          * to send an ICMP Port Unreachable for a broadcast
  606                          * or multicast datgram.)
  607                          */
  608                         UDPSTAT_INC(udps_noportbcast);
  609                         if (inp)
  610                                 INP_RUNLOCK(inp);
  611                         INP_INFO_RUNLOCK(pcbinfo);
  612                         goto badunlocked;
  613                 }
  614                 UDP_PROBE(receive, NULL, last, ip, last, uh);
  615                 if (udp_append(last, ip, m, iphlen, &udp_in) == 0) 
  616                         INP_RUNLOCK(last);
  617         inp_lost:
  618                 INP_INFO_RUNLOCK(pcbinfo);
  619                 return (IPPROTO_DONE);
  620         }
  621 
  622         /*
  623          * Locate pcb for datagram.
  624          */
  625 
  626         /*
  627          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  628          */
  629         if ((m->m_flags & M_IP_NEXTHOP) &&
  630             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  631                 struct sockaddr_in *next_hop;
  632 
  633                 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
  634 
  635                 /*
  636                  * Transparently forwarded. Pretend to be the destination.
  637                  * Already got one like this?
  638                  */
  639                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
  640                     ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m);
  641                 if (!inp) {
  642                         /*
  643                          * It's new.  Try to find the ambushing socket.
  644                          * Because we've rewritten the destination address,
  645                          * any hardware-generated hash is ignored.
  646                          */
  647                         inp = in_pcblookup(pcbinfo, ip->ip_src,
  648                             uh->uh_sport, next_hop->sin_addr,
  649                             next_hop->sin_port ? htons(next_hop->sin_port) :
  650                             uh->uh_dport, INPLOOKUP_WILDCARD |
  651                             INPLOOKUP_RLOCKPCB, ifp);
  652                 }
  653                 /* Remove the tag from the packet. We don't need it anymore. */
  654                 m_tag_delete(m, fwd_tag);
  655                 m->m_flags &= ~M_IP_NEXTHOP;
  656         } else
  657                 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
  658                     ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
  659                     INPLOOKUP_RLOCKPCB, ifp, m);
  660         if (inp == NULL) {
  661                 if (udp_log_in_vain) {
  662                         char src[INET_ADDRSTRLEN];
  663                         char dst[INET_ADDRSTRLEN];
  664 
  665                         log(LOG_INFO,
  666                             "Connection attempt to UDP %s:%d from %s:%d\n",
  667                             inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
  668                             inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
  669                 }
  670                 UDPSTAT_INC(udps_noport);
  671                 if (m->m_flags & (M_BCAST | M_MCAST)) {
  672                         UDPSTAT_INC(udps_noportbcast);
  673                         goto badunlocked;
  674                 }
  675                 if (V_udp_blackhole)
  676                         goto badunlocked;
  677                 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
  678                         goto badunlocked;
  679                 *ip = save_ip;
  680                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
  681                 return (IPPROTO_DONE);
  682         }
  683 
  684         /*
  685          * Check the minimum TTL for socket.
  686          */
  687         INP_RLOCK_ASSERT(inp);
  688         if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
  689                 INP_RUNLOCK(inp);
  690                 m_freem(m);
  691                 return (IPPROTO_DONE);
  692         }
  693         if (cscov_partial) {
  694                 struct udpcb *up;
  695 
  696                 up = intoudpcb(inp);
  697                 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
  698                         INP_RUNLOCK(inp);
  699                         m_freem(m);
  700                         return (IPPROTO_DONE);
  701                 }
  702         }
  703 
  704         UDP_PROBE(receive, NULL, inp, ip, inp, uh);
  705         if (udp_append(inp, ip, m, iphlen, &udp_in) == 0) 
  706                 INP_RUNLOCK(inp);
  707         return (IPPROTO_DONE);
  708 
  709 badunlocked:
  710         m_freem(m);
  711         return (IPPROTO_DONE);
  712 }
  713 #endif /* INET */
  714 
  715 /*
  716  * Notify a udp user of an asynchronous error; just wake up so that they can
  717  * collect error status.
  718  */
  719 struct inpcb *
  720 udp_notify(struct inpcb *inp, int errno)
  721 {
  722 
  723         /*
  724          * While udp_ctlinput() always calls udp_notify() with a read lock
  725          * when invoking it directly, in_pcbnotifyall() currently uses write
  726          * locks due to sharing code with TCP.  For now, accept either a read
  727          * or a write lock, but a read lock is sufficient.
  728          */
  729         INP_LOCK_ASSERT(inp);
  730         if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
  731              errno == EHOSTDOWN) && inp->inp_route.ro_rt) {
  732                 RTFREE(inp->inp_route.ro_rt);
  733                 inp->inp_route.ro_rt = (struct rtentry *)NULL;
  734         }
  735 
  736         inp->inp_socket->so_error = errno;
  737         sorwakeup(inp->inp_socket);
  738         sowwakeup(inp->inp_socket);
  739         return (inp);
  740 }
  741 
  742 #ifdef INET
  743 static void
  744 udp_common_ctlinput(int cmd, struct sockaddr *sa, void *vip,
  745     struct inpcbinfo *pcbinfo)
  746 {
  747         struct ip *ip = vip;
  748         struct udphdr *uh;
  749         struct in_addr faddr;
  750         struct inpcb *inp;
  751 
  752         faddr = ((struct sockaddr_in *)sa)->sin_addr;
  753         if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
  754                 return;
  755 
  756         if (PRC_IS_REDIRECT(cmd)) {
  757                 /* signal EHOSTDOWN, as it flushes the cached route */
  758                 in_pcbnotifyall(&V_udbinfo, faddr, EHOSTDOWN, udp_notify);
  759                 return;
  760         }
  761 
  762         /*
  763          * Hostdead is ugly because it goes linearly through all PCBs.
  764          *
  765          * XXX: We never get this from ICMP, otherwise it makes an excellent
  766          * DoS attack on machines with many connections.
  767          */
  768         if (cmd == PRC_HOSTDEAD)
  769                 ip = NULL;
  770         else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
  771                 return;
  772         if (ip != NULL) {
  773                 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
  774                 inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
  775                     ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL);
  776                 if (inp != NULL) {
  777                         INP_RLOCK_ASSERT(inp);
  778                         if (inp->inp_socket != NULL) {
  779                                 udp_notify(inp, inetctlerrmap[cmd]);
  780                         }
  781                         INP_RUNLOCK(inp);
  782                 } else {
  783                         inp = in_pcblookup(pcbinfo, faddr, uh->uh_dport,
  784                                            ip->ip_src, uh->uh_sport,
  785                                            INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  786                         if (inp != NULL) {
  787                                 struct udpcb *up;
  788 
  789                                 up = intoudpcb(inp);
  790                                 if (up->u_icmp_func != NULL) {
  791                                         INP_RUNLOCK(inp);
  792                                         (*up->u_icmp_func)(cmd, sa, vip, up->u_tun_ctx);
  793                                 } else {
  794                                         INP_RUNLOCK(inp);
  795                                 }
  796                         }
  797                 }
  798         } else
  799                 in_pcbnotifyall(pcbinfo, faddr, inetctlerrmap[cmd],
  800                     udp_notify);
  801 }
  802 void
  803 udp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
  804 {
  805 
  806         return (udp_common_ctlinput(cmd, sa, vip, &V_udbinfo));
  807 }
  808 
  809 void
  810 udplite_ctlinput(int cmd, struct sockaddr *sa, void *vip)
  811 {
  812 
  813         return (udp_common_ctlinput(cmd, sa, vip, &V_ulitecbinfo));
  814 }
  815 #endif /* INET */
  816 
  817 static int
  818 udp_pcblist(SYSCTL_HANDLER_ARGS)
  819 {
  820         int error, i, n;
  821         struct inpcb *inp, **inp_list;
  822         inp_gen_t gencnt;
  823         struct xinpgen xig;
  824 
  825         /*
  826          * The process of preparing the PCB list is too time-consuming and
  827          * resource-intensive to repeat twice on every request.
  828          */
  829         if (req->oldptr == 0) {
  830                 n = V_udbinfo.ipi_count;
  831                 n += imax(n / 8, 10);
  832                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
  833                 return (0);
  834         }
  835 
  836         if (req->newptr != 0)
  837                 return (EPERM);
  838 
  839         /*
  840          * OK, now we're committed to doing something.
  841          */
  842         INP_INFO_RLOCK(&V_udbinfo);
  843         gencnt = V_udbinfo.ipi_gencnt;
  844         n = V_udbinfo.ipi_count;
  845         INP_INFO_RUNLOCK(&V_udbinfo);
  846 
  847         error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
  848                 + n * sizeof(struct xinpcb));
  849         if (error != 0)
  850                 return (error);
  851 
  852         xig.xig_len = sizeof xig;
  853         xig.xig_count = n;
  854         xig.xig_gen = gencnt;
  855         xig.xig_sogen = so_gencnt;
  856         error = SYSCTL_OUT(req, &xig, sizeof xig);
  857         if (error)
  858                 return (error);
  859 
  860         inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
  861         if (inp_list == NULL)
  862                 return (ENOMEM);
  863 
  864         INP_INFO_RLOCK(&V_udbinfo);
  865         for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n;
  866              inp = LIST_NEXT(inp, inp_list)) {
  867                 INP_WLOCK(inp);
  868                 if (inp->inp_gencnt <= gencnt &&
  869                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
  870                         in_pcbref(inp);
  871                         inp_list[i++] = inp;
  872                 }
  873                 INP_WUNLOCK(inp);
  874         }
  875         INP_INFO_RUNLOCK(&V_udbinfo);
  876         n = i;
  877 
  878         error = 0;
  879         for (i = 0; i < n; i++) {
  880                 inp = inp_list[i];
  881                 INP_RLOCK(inp);
  882                 if (inp->inp_gencnt <= gencnt) {
  883                         struct xinpcb xi;
  884 
  885                         bzero(&xi, sizeof(xi));
  886                         xi.xi_len = sizeof xi;
  887                         /* XXX should avoid extra copy */
  888                         bcopy(inp, &xi.xi_inp, sizeof *inp);
  889                         if (inp->inp_socket)
  890                                 sotoxsocket(inp->inp_socket, &xi.xi_socket);
  891                         xi.xi_inp.inp_gencnt = inp->inp_gencnt;
  892                         INP_RUNLOCK(inp);
  893                         error = SYSCTL_OUT(req, &xi, sizeof xi);
  894                 } else
  895                         INP_RUNLOCK(inp);
  896         }
  897         INP_INFO_WLOCK(&V_udbinfo);
  898         for (i = 0; i < n; i++) {
  899                 inp = inp_list[i];
  900                 INP_RLOCK(inp);
  901                 if (!in_pcbrele_rlocked(inp))
  902                         INP_RUNLOCK(inp);
  903         }
  904         INP_INFO_WUNLOCK(&V_udbinfo);
  905 
  906         if (!error) {
  907                 /*
  908                  * Give the user an updated idea of our state.  If the
  909                  * generation differs from what we told her before, she knows
  910                  * that something happened while we were processing this
  911                  * request, and it might be necessary to retry.
  912                  */
  913                 INP_INFO_RLOCK(&V_udbinfo);
  914                 xig.xig_gen = V_udbinfo.ipi_gencnt;
  915                 xig.xig_sogen = so_gencnt;
  916                 xig.xig_count = V_udbinfo.ipi_count;
  917                 INP_INFO_RUNLOCK(&V_udbinfo);
  918                 error = SYSCTL_OUT(req, &xig, sizeof xig);
  919         }
  920         free(inp_list, M_TEMP);
  921         return (error);
  922 }
  923 
  924 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
  925     CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
  926     udp_pcblist, "S,xinpcb", "List of active UDP sockets");
  927 
  928 #ifdef INET
  929 static int
  930 udp_getcred(SYSCTL_HANDLER_ARGS)
  931 {
  932         struct xucred xuc;
  933         struct sockaddr_in addrs[2];
  934         struct inpcb *inp;
  935         int error;
  936 
  937         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  938         if (error)
  939                 return (error);
  940         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  941         if (error)
  942                 return (error);
  943         inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
  944             addrs[0].sin_addr, addrs[0].sin_port,
  945             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  946         if (inp != NULL) {
  947                 INP_RLOCK_ASSERT(inp);
  948                 if (inp->inp_socket == NULL)
  949                         error = ENOENT;
  950                 if (error == 0)
  951                         error = cr_canseeinpcb(req->td->td_ucred, inp);
  952                 if (error == 0)
  953                         cru2x(inp->inp_cred, &xuc);
  954                 INP_RUNLOCK(inp);
  955         } else
  956                 error = ENOENT;
  957         if (error == 0)
  958                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  959         return (error);
  960 }
  961 
  962 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
  963     CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
  964     udp_getcred, "S,xucred", "Get the xucred of a UDP connection");
  965 #endif /* INET */
  966 
  967 int
  968 udp_ctloutput(struct socket *so, struct sockopt *sopt)
  969 {
  970         struct inpcb *inp;
  971         struct udpcb *up;
  972         int isudplite, error, optval;
  973 
  974         error = 0;
  975         isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
  976         inp = sotoinpcb(so);
  977         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
  978         INP_WLOCK(inp);
  979         if (sopt->sopt_level != so->so_proto->pr_protocol) {
  980 #ifdef INET6
  981                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
  982                         INP_WUNLOCK(inp);
  983                         error = ip6_ctloutput(so, sopt);
  984                 }
  985 #endif
  986 #if defined(INET) && defined(INET6)
  987                 else
  988 #endif
  989 #ifdef INET
  990                 {
  991                         INP_WUNLOCK(inp);
  992                         error = ip_ctloutput(so, sopt);
  993                 }
  994 #endif
  995                 return (error);
  996         }
  997 
  998         switch (sopt->sopt_dir) {
  999         case SOPT_SET:
 1000                 switch (sopt->sopt_name) {
 1001 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 1002 #ifdef INET
 1003                 case UDP_ENCAP:
 1004                         if (!IPSEC_ENABLED(ipv4)) {
 1005                                 INP_WUNLOCK(inp);
 1006                                 return (ENOPROTOOPT);
 1007                         }
 1008                         error = UDPENCAP_PCBCTL(inp, sopt);
 1009                         break;
 1010 #endif /* INET */
 1011 #endif /* IPSEC */
 1012                 case UDPLITE_SEND_CSCOV:
 1013                 case UDPLITE_RECV_CSCOV:
 1014                         if (!isudplite) {
 1015                                 INP_WUNLOCK(inp);
 1016                                 error = ENOPROTOOPT;
 1017                                 break;
 1018                         }
 1019                         INP_WUNLOCK(inp);
 1020                         error = sooptcopyin(sopt, &optval, sizeof(optval),
 1021                             sizeof(optval));
 1022                         if (error != 0)
 1023                                 break;
 1024                         inp = sotoinpcb(so);
 1025                         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
 1026                         INP_WLOCK(inp);
 1027                         up = intoudpcb(inp);
 1028                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1029                         if ((optval != 0 && optval < 8) || (optval > 65535)) {
 1030                                 INP_WUNLOCK(inp);
 1031                                 error = EINVAL;
 1032                                 break;
 1033                         }
 1034                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
 1035                                 up->u_txcslen = optval;
 1036                         else
 1037                                 up->u_rxcslen = optval;
 1038                         INP_WUNLOCK(inp);
 1039                         break;
 1040                 default:
 1041                         INP_WUNLOCK(inp);
 1042                         error = ENOPROTOOPT;
 1043                         break;
 1044                 }
 1045                 break;
 1046         case SOPT_GET:
 1047                 switch (sopt->sopt_name) {
 1048 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 1049 #ifdef INET
 1050                 case UDP_ENCAP:
 1051                         if (!IPSEC_ENABLED(ipv4)) {
 1052                                 INP_WUNLOCK(inp);
 1053                                 return (ENOPROTOOPT);
 1054                         }
 1055                         error = UDPENCAP_PCBCTL(inp, sopt);
 1056                         break;
 1057 #endif /* INET */
 1058 #endif /* IPSEC */
 1059                 case UDPLITE_SEND_CSCOV:
 1060                 case UDPLITE_RECV_CSCOV:
 1061                         if (!isudplite) {
 1062                                 INP_WUNLOCK(inp);
 1063                                 error = ENOPROTOOPT;
 1064                                 break;
 1065                         }
 1066                         up = intoudpcb(inp);
 1067                         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1068                         if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
 1069                                 optval = up->u_txcslen;
 1070                         else
 1071                                 optval = up->u_rxcslen;
 1072                         INP_WUNLOCK(inp);
 1073                         error = sooptcopyout(sopt, &optval, sizeof(optval));
 1074                         break;
 1075                 default:
 1076                         INP_WUNLOCK(inp);
 1077                         error = ENOPROTOOPT;
 1078                         break;
 1079                 }
 1080                 break;
 1081         }       
 1082         return (error);
 1083 }
 1084 
 1085 #ifdef INET
 1086 #define UH_WLOCKED      2
 1087 #define UH_RLOCKED      1
 1088 #define UH_UNLOCKED     0
 1089 static int
 1090 udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
 1091     struct mbuf *control, struct thread *td)
 1092 {
 1093         struct udpiphdr *ui;
 1094         int len = m->m_pkthdr.len;
 1095         struct in_addr faddr, laddr;
 1096         struct cmsghdr *cm;
 1097         struct inpcbinfo *pcbinfo;
 1098         struct sockaddr_in *sin, src;
 1099         int cscov_partial = 0;
 1100         int error = 0;
 1101         int ipflags;
 1102         u_short fport, lport;
 1103         int unlock_udbinfo, unlock_inp;
 1104         u_char tos;
 1105         uint8_t pr;
 1106         uint16_t cscov = 0;
 1107         uint32_t flowid = 0;
 1108         uint8_t flowtype = M_HASHTYPE_NONE;
 1109 
 1110         /*
 1111          * udp_output() may need to temporarily bind or connect the current
 1112          * inpcb.  As such, we don't know up front whether we will need the
 1113          * pcbinfo lock or not.  Do any work to decide what is needed up
 1114          * front before acquiring any locks.
 1115          */
 1116         if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
 1117                 if (control)
 1118                         m_freem(control);
 1119                 m_freem(m);
 1120                 return (EMSGSIZE);
 1121         }
 1122 
 1123         src.sin_family = 0;
 1124         sin = (struct sockaddr_in *)addr;
 1125         if (sin == NULL ||
 1126             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
 1127                 INP_WLOCK(inp);
 1128                 unlock_inp = UH_WLOCKED;
 1129         } else {
 1130                 INP_RLOCK(inp);
 1131                 unlock_inp = UH_RLOCKED;
 1132         }
 1133         tos = inp->inp_ip_tos;
 1134         if (control != NULL) {
 1135                 /*
 1136                  * XXX: Currently, we assume all the optional information is
 1137                  * stored in a single mbuf.
 1138                  */
 1139                 if (control->m_next) {
 1140                         if (unlock_inp == UH_WLOCKED)
 1141                                 INP_WUNLOCK(inp);
 1142                         else
 1143                                 INP_RUNLOCK(inp);
 1144                         m_freem(control);
 1145                         m_freem(m);
 1146                         return (EINVAL);
 1147                 }
 1148                 for (; control->m_len > 0;
 1149                     control->m_data += CMSG_ALIGN(cm->cmsg_len),
 1150                     control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
 1151                         cm = mtod(control, struct cmsghdr *);
 1152                         if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
 1153                             || cm->cmsg_len > control->m_len) {
 1154                                 error = EINVAL;
 1155                                 break;
 1156                         }
 1157                         if (cm->cmsg_level != IPPROTO_IP)
 1158                                 continue;
 1159 
 1160                         switch (cm->cmsg_type) {
 1161                         case IP_SENDSRCADDR:
 1162                                 if (cm->cmsg_len !=
 1163                                     CMSG_LEN(sizeof(struct in_addr))) {
 1164                                         error = EINVAL;
 1165                                         break;
 1166                                 }
 1167                                 bzero(&src, sizeof(src));
 1168                                 src.sin_family = AF_INET;
 1169                                 src.sin_len = sizeof(src);
 1170                                 src.sin_port = inp->inp_lport;
 1171                                 src.sin_addr =
 1172                                     *(struct in_addr *)CMSG_DATA(cm);
 1173                                 break;
 1174 
 1175                         case IP_TOS:
 1176                                 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
 1177                                         error = EINVAL;
 1178                                         break;
 1179                                 }
 1180                                 tos = *(u_char *)CMSG_DATA(cm);
 1181                                 break;
 1182 
 1183                         case IP_FLOWID:
 1184                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
 1185                                         error = EINVAL;
 1186                                         break;
 1187                                 }
 1188                                 flowid = *(uint32_t *) CMSG_DATA(cm);
 1189                                 break;
 1190 
 1191                         case IP_FLOWTYPE:
 1192                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
 1193                                         error = EINVAL;
 1194                                         break;
 1195                                 }
 1196                                 flowtype = *(uint32_t *) CMSG_DATA(cm);
 1197                                 break;
 1198 
 1199 #ifdef  RSS
 1200                         case IP_RSSBUCKETID:
 1201                                 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
 1202                                         error = EINVAL;
 1203                                         break;
 1204                                 }
 1205                                 /* This is just a placeholder for now */
 1206                                 break;
 1207 #endif  /* RSS */
 1208                         default:
 1209                                 error = ENOPROTOOPT;
 1210                                 break;
 1211                         }
 1212                         if (error)
 1213                                 break;
 1214                 }
 1215                 m_freem(control);
 1216         }
 1217         if (error) {
 1218                 if (unlock_inp == UH_WLOCKED)
 1219                         INP_WUNLOCK(inp);
 1220                 else
 1221                         INP_RUNLOCK(inp);
 1222                 m_freem(m);
 1223                 return (error);
 1224         }
 1225 
 1226         /*
 1227          * Depending on whether or not the application has bound or connected
 1228          * the socket, we may have to do varying levels of work.  The optimal
 1229          * case is for a connected UDP socket, as a global lock isn't
 1230          * required at all.
 1231          *
 1232          * In order to decide which we need, we require stability of the
 1233          * inpcb binding, which we ensure by acquiring a read lock on the
 1234          * inpcb.  This doesn't strictly follow the lock order, so we play
 1235          * the trylock and retry game; note that we may end up with more
 1236          * conservative locks than required the second time around, so later
 1237          * assertions have to accept that.  Further analysis of the number of
 1238          * misses under contention is required.
 1239          *
 1240          * XXXRW: Check that hash locking update here is correct.
 1241          */
 1242         pr = inp->inp_socket->so_proto->pr_protocol;
 1243         pcbinfo = udp_get_inpcbinfo(pr);
 1244         sin = (struct sockaddr_in *)addr;
 1245         if (sin != NULL &&
 1246             (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) {
 1247                 INP_HASH_WLOCK(pcbinfo);
 1248                 unlock_udbinfo = UH_WLOCKED;
 1249         } else if ((sin != NULL && (
 1250             (sin->sin_addr.s_addr == INADDR_ANY) ||
 1251             (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
 1252             (inp->inp_laddr.s_addr == INADDR_ANY) ||
 1253             (inp->inp_lport == 0))) ||
 1254             (src.sin_family == AF_INET)) {
 1255                 INP_HASH_RLOCK(pcbinfo);
 1256                 unlock_udbinfo = UH_RLOCKED;
 1257         } else
 1258                 unlock_udbinfo = UH_UNLOCKED;
 1259 
 1260         /*
 1261          * If the IP_SENDSRCADDR control message was specified, override the
 1262          * source address for this datagram.  Its use is invalidated if the
 1263          * address thus specified is incomplete or clobbers other inpcbs.
 1264          */
 1265         laddr = inp->inp_laddr;
 1266         lport = inp->inp_lport;
 1267         if (src.sin_family == AF_INET) {
 1268                 INP_HASH_LOCK_ASSERT(pcbinfo);
 1269                 if ((lport == 0) ||
 1270                     (laddr.s_addr == INADDR_ANY &&
 1271                      src.sin_addr.s_addr == INADDR_ANY)) {
 1272                         error = EINVAL;
 1273                         goto release;
 1274                 }
 1275                 error = in_pcbbind_setup(inp, (struct sockaddr *)&src,
 1276                     &laddr.s_addr, &lport, td->td_ucred);
 1277                 if (error)
 1278                         goto release;
 1279         }
 1280 
 1281         /*
 1282          * If a UDP socket has been connected, then a local address/port will
 1283          * have been selected and bound.
 1284          *
 1285          * If a UDP socket has not been connected to, then an explicit
 1286          * destination address must be used, in which case a local
 1287          * address/port may not have been selected and bound.
 1288          */
 1289         if (sin != NULL) {
 1290                 INP_LOCK_ASSERT(inp);
 1291                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1292                         error = EISCONN;
 1293                         goto release;
 1294                 }
 1295 
 1296                 /*
 1297                  * Jail may rewrite the destination address, so let it do
 1298                  * that before we use it.
 1299                  */
 1300                 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
 1301                 if (error)
 1302                         goto release;
 1303 
 1304                 /*
 1305                  * If a local address or port hasn't yet been selected, or if
 1306                  * the destination address needs to be rewritten due to using
 1307                  * a special INADDR_ constant, invoke in_pcbconnect_setup()
 1308                  * to do the heavy lifting.  Once a port is selected, we
 1309                  * commit the binding back to the socket; we also commit the
 1310                  * binding of the address if in jail.
 1311                  *
 1312                  * If we already have a valid binding and we're not
 1313                  * requesting a destination address rewrite, use a fast path.
 1314                  */
 1315                 if (inp->inp_laddr.s_addr == INADDR_ANY ||
 1316                     inp->inp_lport == 0 ||
 1317                     sin->sin_addr.s_addr == INADDR_ANY ||
 1318                     sin->sin_addr.s_addr == INADDR_BROADCAST) {
 1319                         INP_HASH_LOCK_ASSERT(pcbinfo);
 1320                         error = in_pcbconnect_setup(inp, addr, &laddr.s_addr,
 1321                             &lport, &faddr.s_addr, &fport, NULL,
 1322                             td->td_ucred);
 1323                         if (error)
 1324                                 goto release;
 1325 
 1326                         /*
 1327                          * XXXRW: Why not commit the port if the address is
 1328                          * !INADDR_ANY?
 1329                          */
 1330                         /* Commit the local port if newly assigned. */
 1331                         if (inp->inp_laddr.s_addr == INADDR_ANY &&
 1332                             inp->inp_lport == 0) {
 1333                                 INP_WLOCK_ASSERT(inp);
 1334                                 INP_HASH_WLOCK_ASSERT(pcbinfo);
 1335                                 /*
 1336                                  * Remember addr if jailed, to prevent
 1337                                  * rebinding.
 1338                                  */
 1339                                 if (prison_flag(td->td_ucred, PR_IP4))
 1340                                         inp->inp_laddr = laddr;
 1341                                 inp->inp_lport = lport;
 1342                                 if (in_pcbinshash(inp) != 0) {
 1343                                         inp->inp_lport = 0;
 1344                                         error = EAGAIN;
 1345                                         goto release;
 1346                                 }
 1347                                 inp->inp_flags |= INP_ANONPORT;
 1348                         }
 1349                 } else {
 1350                         faddr = sin->sin_addr;
 1351                         fport = sin->sin_port;
 1352                 }
 1353         } else {
 1354                 INP_LOCK_ASSERT(inp);
 1355                 faddr = inp->inp_faddr;
 1356                 fport = inp->inp_fport;
 1357                 if (faddr.s_addr == INADDR_ANY) {
 1358                         error = ENOTCONN;
 1359                         goto release;
 1360                 }
 1361         }
 1362 
 1363         /*
 1364          * Calculate data length and get a mbuf for UDP, IP, and possible
 1365          * link-layer headers.  Immediate slide the data pointer back forward
 1366          * since we won't use that space at this layer.
 1367          */
 1368         M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
 1369         if (m == NULL) {
 1370                 error = ENOBUFS;
 1371                 goto release;
 1372         }
 1373         m->m_data += max_linkhdr;
 1374         m->m_len -= max_linkhdr;
 1375         m->m_pkthdr.len -= max_linkhdr;
 1376 
 1377         /*
 1378          * Fill in mbuf with extended UDP header and addresses and length put
 1379          * into network format.
 1380          */
 1381         ui = mtod(m, struct udpiphdr *);
 1382         bzero(ui->ui_x1, sizeof(ui->ui_x1));    /* XXX still needed? */
 1383         ui->ui_pr = pr;
 1384         ui->ui_src = laddr;
 1385         ui->ui_dst = faddr;
 1386         ui->ui_sport = lport;
 1387         ui->ui_dport = fport;
 1388         ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
 1389         if (pr == IPPROTO_UDPLITE) {
 1390                 struct udpcb *up;
 1391                 uint16_t plen;
 1392 
 1393                 up = intoudpcb(inp);
 1394                 cscov = up->u_txcslen;
 1395                 plen = (u_short)len + sizeof(struct udphdr);
 1396                 if (cscov >= plen)
 1397                         cscov = 0;
 1398                 ui->ui_len = htons(plen);
 1399                 ui->ui_ulen = htons(cscov);
 1400                 /*
 1401                  * For UDP-Lite, checksum coverage length of zero means
 1402                  * the entire UDPLite packet is covered by the checksum.
 1403                  */
 1404                 cscov_partial = (cscov == 0) ? 0 : 1;
 1405         } else
 1406                 ui->ui_v = IPVERSION << 4;
 1407 
 1408         /*
 1409          * Set the Don't Fragment bit in the IP header.
 1410          */
 1411         if (inp->inp_flags & INP_DONTFRAG) {
 1412                 struct ip *ip;
 1413 
 1414                 ip = (struct ip *)&ui->ui_i;
 1415                 ip->ip_off |= htons(IP_DF);
 1416         }
 1417 
 1418         ipflags = 0;
 1419         if (inp->inp_socket->so_options & SO_DONTROUTE)
 1420                 ipflags |= IP_ROUTETOIF;
 1421         if (inp->inp_socket->so_options & SO_BROADCAST)
 1422                 ipflags |= IP_ALLOWBROADCAST;
 1423         if (inp->inp_flags & INP_ONESBCAST)
 1424                 ipflags |= IP_SENDONES;
 1425 
 1426 #ifdef MAC
 1427         mac_inpcb_create_mbuf(inp, m);
 1428 #endif
 1429 
 1430         /*
 1431          * Set up checksum and output datagram.
 1432          */
 1433         ui->ui_sum = 0;
 1434         if (pr == IPPROTO_UDPLITE) {
 1435                 if (inp->inp_flags & INP_ONESBCAST)
 1436                         faddr.s_addr = INADDR_BROADCAST;
 1437                 if (cscov_partial) {
 1438                         if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
 1439                                 ui->ui_sum = 0xffff;
 1440                 } else {
 1441                         if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
 1442                                 ui->ui_sum = 0xffff;
 1443                 }
 1444         } else if (V_udp_cksum) {
 1445                 if (inp->inp_flags & INP_ONESBCAST)
 1446                         faddr.s_addr = INADDR_BROADCAST;
 1447                 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
 1448                     htons((u_short)len + sizeof(struct udphdr) + pr));
 1449                 m->m_pkthdr.csum_flags = CSUM_UDP;
 1450                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
 1451         }
 1452         ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
 1453         ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;    /* XXX */
 1454         ((struct ip *)ui)->ip_tos = tos;                /* XXX */
 1455         UDPSTAT_INC(udps_opackets);
 1456 
 1457         /*
 1458          * Setup flowid / RSS information for outbound socket.
 1459          *
 1460          * Once the UDP code decides to set a flowid some other way,
 1461          * this allows the flowid to be overridden by userland.
 1462          */
 1463         if (flowtype != M_HASHTYPE_NONE) {
 1464                 m->m_pkthdr.flowid = flowid;
 1465                 M_HASHTYPE_SET(m, flowtype);
 1466 #ifdef  RSS
 1467         } else {
 1468                 uint32_t hash_val, hash_type;
 1469                 /*
 1470                  * Calculate an appropriate RSS hash for UDP and
 1471                  * UDP Lite.
 1472                  *
 1473                  * The called function will take care of figuring out
 1474                  * whether a 2-tuple or 4-tuple hash is required based
 1475                  * on the currently configured scheme.
 1476                  *
 1477                  * Later later on connected socket values should be
 1478                  * cached in the inpcb and reused, rather than constantly
 1479                  * re-calculating it.
 1480                  *
 1481                  * UDP Lite is a different protocol number and will
 1482                  * likely end up being hashed as a 2-tuple until
 1483                  * RSS / NICs grow UDP Lite protocol awareness.
 1484                  */
 1485                 if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
 1486                     pr, &hash_val, &hash_type) == 0) {
 1487                         m->m_pkthdr.flowid = hash_val;
 1488                         M_HASHTYPE_SET(m, hash_type);
 1489                 }
 1490 #endif
 1491         }
 1492 
 1493 #ifdef  RSS
 1494         /*
 1495          * Don't override with the inp cached flowid value.
 1496          *
 1497          * Depending upon the kind of send being done, the inp
 1498          * flowid/flowtype values may actually not be appropriate
 1499          * for this particular socket send.
 1500          *
 1501          * We should either leave the flowid at zero (which is what is
 1502          * currently done) or set it to some software generated
 1503          * hash value based on the packet contents.
 1504          */
 1505         ipflags |= IP_NODEFAULTFLOWID;
 1506 #endif  /* RSS */
 1507 
 1508         if (unlock_udbinfo == UH_WLOCKED)
 1509                 INP_HASH_WUNLOCK(pcbinfo);
 1510         else if (unlock_udbinfo == UH_RLOCKED)
 1511                 INP_HASH_RUNLOCK(pcbinfo);
 1512         UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
 1513         error = ip_output(m, inp->inp_options,
 1514             (unlock_inp == UH_WLOCKED ? &inp->inp_route : NULL), ipflags,
 1515             inp->inp_moptions, inp);
 1516         if (unlock_inp == UH_WLOCKED)
 1517                 INP_WUNLOCK(inp);
 1518         else
 1519                 INP_RUNLOCK(inp);
 1520         return (error);
 1521 
 1522 release:
 1523         if (unlock_udbinfo == UH_WLOCKED) {
 1524                 KASSERT(unlock_inp == UH_WLOCKED,
 1525                     ("%s: excl udbinfo lock, shared inp lock", __func__));
 1526                 INP_HASH_WUNLOCK(pcbinfo);
 1527                 INP_WUNLOCK(inp);
 1528         } else if (unlock_udbinfo == UH_RLOCKED) {
 1529                 KASSERT(unlock_inp == UH_RLOCKED,
 1530                     ("%s: shared udbinfo lock, excl inp lock", __func__));
 1531                 INP_HASH_RUNLOCK(pcbinfo);
 1532                 INP_RUNLOCK(inp);
 1533         } else if (unlock_inp == UH_WLOCKED)
 1534                 INP_WUNLOCK(inp);
 1535         else
 1536                 INP_RUNLOCK(inp);
 1537         m_freem(m);
 1538         return (error);
 1539 }
 1540 
 1541 static void
 1542 udp_abort(struct socket *so)
 1543 {
 1544         struct inpcb *inp;
 1545         struct inpcbinfo *pcbinfo;
 1546 
 1547         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1548         inp = sotoinpcb(so);
 1549         KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
 1550         INP_WLOCK(inp);
 1551         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1552                 INP_HASH_WLOCK(pcbinfo);
 1553                 in_pcbdisconnect(inp);
 1554                 inp->inp_laddr.s_addr = INADDR_ANY;
 1555                 INP_HASH_WUNLOCK(pcbinfo);
 1556                 soisdisconnected(so);
 1557         }
 1558         INP_WUNLOCK(inp);
 1559 }
 1560 
 1561 static int
 1562 udp_attach(struct socket *so, int proto, struct thread *td)
 1563 {
 1564         struct inpcb *inp;
 1565         struct inpcbinfo *pcbinfo;
 1566         int error;
 1567 
 1568         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1569         inp = sotoinpcb(so);
 1570         KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
 1571         error = soreserve(so, udp_sendspace, udp_recvspace);
 1572         if (error)
 1573                 return (error);
 1574         INP_INFO_WLOCK(pcbinfo);
 1575         error = in_pcballoc(so, pcbinfo);
 1576         if (error) {
 1577                 INP_INFO_WUNLOCK(pcbinfo);
 1578                 return (error);
 1579         }
 1580 
 1581         inp = sotoinpcb(so);
 1582         inp->inp_vflag |= INP_IPV4;
 1583         inp->inp_ip_ttl = V_ip_defttl;
 1584 
 1585         error = udp_newudpcb(inp);
 1586         if (error) {
 1587                 in_pcbdetach(inp);
 1588                 in_pcbfree(inp);
 1589                 INP_INFO_WUNLOCK(pcbinfo);
 1590                 return (error);
 1591         }
 1592 
 1593         INP_WUNLOCK(inp);
 1594         INP_INFO_WUNLOCK(pcbinfo);
 1595         return (0);
 1596 }
 1597 #endif /* INET */
 1598 
 1599 int
 1600 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
 1601 {
 1602         struct inpcb *inp;
 1603         struct udpcb *up;
 1604 
 1605         KASSERT(so->so_type == SOCK_DGRAM,
 1606             ("udp_set_kernel_tunneling: !dgram"));
 1607         inp = sotoinpcb(so);
 1608         KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
 1609         INP_WLOCK(inp);
 1610         up = intoudpcb(inp);
 1611         if ((up->u_tun_func != NULL) ||
 1612             (up->u_icmp_func != NULL)) {
 1613                 INP_WUNLOCK(inp);
 1614                 return (EBUSY);
 1615         }
 1616         up->u_tun_func = f;
 1617         up->u_icmp_func = i;
 1618         up->u_tun_ctx = ctx;
 1619         INP_WUNLOCK(inp);
 1620         return (0);
 1621 }
 1622 
 1623 #ifdef INET
 1624 static int
 1625 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 1626 {
 1627         struct inpcb *inp;
 1628         struct inpcbinfo *pcbinfo;
 1629         int error;
 1630 
 1631         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1632         inp = sotoinpcb(so);
 1633         KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
 1634         INP_WLOCK(inp);
 1635         INP_HASH_WLOCK(pcbinfo);
 1636         error = in_pcbbind(inp, nam, td->td_ucred);
 1637         INP_HASH_WUNLOCK(pcbinfo);
 1638         INP_WUNLOCK(inp);
 1639         return (error);
 1640 }
 1641 
 1642 static void
 1643 udp_close(struct socket *so)
 1644 {
 1645         struct inpcb *inp;
 1646         struct inpcbinfo *pcbinfo;
 1647 
 1648         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1649         inp = sotoinpcb(so);
 1650         KASSERT(inp != NULL, ("udp_close: inp == NULL"));
 1651         INP_WLOCK(inp);
 1652         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1653                 INP_HASH_WLOCK(pcbinfo);
 1654                 in_pcbdisconnect(inp);
 1655                 inp->inp_laddr.s_addr = INADDR_ANY;
 1656                 INP_HASH_WUNLOCK(pcbinfo);
 1657                 soisdisconnected(so);
 1658         }
 1659         INP_WUNLOCK(inp);
 1660 }
 1661 
 1662 static int
 1663 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 1664 {
 1665         struct inpcb *inp;
 1666         struct inpcbinfo *pcbinfo;
 1667         struct sockaddr_in *sin;
 1668         int error;
 1669 
 1670         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1671         inp = sotoinpcb(so);
 1672         KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
 1673         INP_WLOCK(inp);
 1674         if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1675                 INP_WUNLOCK(inp);
 1676                 return (EISCONN);
 1677         }
 1678         sin = (struct sockaddr_in *)nam;
 1679         error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
 1680         if (error != 0) {
 1681                 INP_WUNLOCK(inp);
 1682                 return (error);
 1683         }
 1684         INP_HASH_WLOCK(pcbinfo);
 1685         error = in_pcbconnect(inp, nam, td->td_ucred);
 1686         INP_HASH_WUNLOCK(pcbinfo);
 1687         if (error == 0)
 1688                 soisconnected(so);
 1689         INP_WUNLOCK(inp);
 1690         return (error);
 1691 }
 1692 
 1693 static void
 1694 udp_detach(struct socket *so)
 1695 {
 1696         struct inpcb *inp;
 1697         struct inpcbinfo *pcbinfo;
 1698         struct udpcb *up;
 1699 
 1700         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1701         inp = sotoinpcb(so);
 1702         KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
 1703         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
 1704             ("udp_detach: not disconnected"));
 1705         INP_INFO_WLOCK(pcbinfo);
 1706         INP_WLOCK(inp);
 1707         up = intoudpcb(inp);
 1708         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1709         inp->inp_ppcb = NULL;
 1710         in_pcbdetach(inp);
 1711         in_pcbfree(inp);
 1712         INP_INFO_WUNLOCK(pcbinfo);
 1713         udp_discardcb(up);
 1714 }
 1715 
 1716 static int
 1717 udp_disconnect(struct socket *so)
 1718 {
 1719         struct inpcb *inp;
 1720         struct inpcbinfo *pcbinfo;
 1721 
 1722         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1723         inp = sotoinpcb(so);
 1724         KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
 1725         INP_WLOCK(inp);
 1726         if (inp->inp_faddr.s_addr == INADDR_ANY) {
 1727                 INP_WUNLOCK(inp);
 1728                 return (ENOTCONN);
 1729         }
 1730         INP_HASH_WLOCK(pcbinfo);
 1731         in_pcbdisconnect(inp);
 1732         inp->inp_laddr.s_addr = INADDR_ANY;
 1733         INP_HASH_WUNLOCK(pcbinfo);
 1734         SOCK_LOCK(so);
 1735         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1736         SOCK_UNLOCK(so);
 1737         INP_WUNLOCK(inp);
 1738         return (0);
 1739 }
 1740 
 1741 static int
 1742 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 1743     struct mbuf *control, struct thread *td)
 1744 {
 1745         struct inpcb *inp;
 1746 
 1747         inp = sotoinpcb(so);
 1748         KASSERT(inp != NULL, ("udp_send: inp == NULL"));
 1749         return (udp_output(inp, m, addr, control, td));
 1750 }
 1751 #endif /* INET */
 1752 
 1753 int
 1754 udp_shutdown(struct socket *so)
 1755 {
 1756         struct inpcb *inp;
 1757 
 1758         inp = sotoinpcb(so);
 1759         KASSERT(inp != NULL, ("udp_shutdown: inp == NULL"));
 1760         INP_WLOCK(inp);
 1761         socantsendmore(so);
 1762         INP_WUNLOCK(inp);
 1763         return (0);
 1764 }
 1765 
 1766 #ifdef INET
 1767 struct pr_usrreqs udp_usrreqs = {
 1768         .pru_abort =            udp_abort,
 1769         .pru_attach =           udp_attach,
 1770         .pru_bind =             udp_bind,
 1771         .pru_connect =          udp_connect,
 1772         .pru_control =          in_control,
 1773         .pru_detach =           udp_detach,
 1774         .pru_disconnect =       udp_disconnect,
 1775         .pru_peeraddr =         in_getpeeraddr,
 1776         .pru_send =             udp_send,
 1777         .pru_soreceive =        soreceive_dgram,
 1778         .pru_sosend =           sosend_dgram,
 1779         .pru_shutdown =         udp_shutdown,
 1780         .pru_sockaddr =         in_getsockaddr,
 1781         .pru_sosetlabel =       in_pcbsosetlabel,
 1782         .pru_close =            udp_close,
 1783 };
 1784 #endif /* INET */

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