The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/udp6_usrreq.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    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  * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
   37  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
   38  */
   39 
   40 /*-
   41  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
   42  *      The Regents of the University of California.
   43  * All rights reserved.
   44  *
   45  * Redistribution and use in source and binary forms, with or without
   46  * modification, are permitted provided that the following conditions
   47  * are met:
   48  * 1. Redistributions of source code must retain the above copyright
   49  *    notice, this list of conditions and the following disclaimer.
   50  * 2. Redistributions in binary form must reproduce the above copyright
   51  *    notice, this list of conditions and the following disclaimer in the
   52  *    documentation and/or other materials provided with the distribution.
   53  * 3. Neither the name of the University nor the names of its contributors
   54  *    may be used to endorse or promote products derived from this software
   55  *    without specific prior written permission.
   56  *
   57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   67  * SUCH DAMAGE.
   68  *
   69  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
   70  */
   71 
   72 #include <sys/cdefs.h>
   73 __FBSDID("$FreeBSD: head/sys/netinet6/udp6_usrreq.c 339251 2018-10-09 13:26:06Z jtl $");
   74 
   75 #include "opt_inet.h"
   76 #include "opt_inet6.h"
   77 #include "opt_ipsec.h"
   78 #include "opt_rss.h"
   79 
   80 #include <sys/param.h>
   81 #include <sys/jail.h>
   82 #include <sys/kernel.h>
   83 #include <sys/lock.h>
   84 #include <sys/mbuf.h>
   85 #include <sys/priv.h>
   86 #include <sys/proc.h>
   87 #include <sys/protosw.h>
   88 #include <sys/sdt.h>
   89 #include <sys/signalvar.h>
   90 #include <sys/socket.h>
   91 #include <sys/socketvar.h>
   92 #include <sys/sx.h>
   93 #include <sys/sysctl.h>
   94 #include <sys/syslog.h>
   95 #include <sys/systm.h>
   96 
   97 #include <net/if.h>
   98 #include <net/if_var.h>
   99 #include <net/if_types.h>
  100 #include <net/route.h>
  101 #include <net/rss_config.h>
  102 
  103 #include <netinet/in.h>
  104 #include <netinet/in_kdtrace.h>
  105 #include <netinet/in_pcb.h>
  106 #include <netinet/in_systm.h>
  107 #include <netinet/in_var.h>
  108 #include <netinet/ip.h>
  109 #include <netinet/ip6.h>
  110 #include <netinet/icmp6.h>
  111 #include <netinet/ip_var.h>
  112 #include <netinet/udp.h>
  113 #include <netinet/udp_var.h>
  114 #include <netinet/udplite.h>
  115 
  116 #include <netinet6/ip6protosw.h>
  117 #include <netinet6/ip6_var.h>
  118 #include <netinet6/in6_pcb.h>
  119 #include <netinet6/in6_rss.h>
  120 #include <netinet6/udp6_var.h>
  121 #include <netinet6/scope6_var.h>
  122 
  123 #include <netipsec/ipsec_support.h>
  124 
  125 #include <security/mac/mac_framework.h>
  126 
  127 /*
  128  * UDP protocol implementation.
  129  * Per RFC 768, August, 1980.
  130  */
  131 
  132 extern struct protosw   inetsw[];
  133 static void             udp6_detach(struct socket *so);
  134 
  135 static int
  136 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
  137     struct sockaddr_in6 *fromsa)
  138 {
  139         struct socket *so;
  140         struct mbuf *opts = NULL, *tmp_opts;
  141         struct udpcb *up;
  142 
  143         INP_LOCK_ASSERT(inp);
  144 
  145         /*
  146          * Engage the tunneling protocol.
  147          */
  148         up = intoudpcb(inp);
  149         if (up->u_tun_func != NULL) {
  150                 in_pcbref(inp);
  151                 INP_RUNLOCK(inp);
  152                 (*up->u_tun_func)(n, off, inp, (struct sockaddr *)&fromsa[0],
  153                     up->u_tun_ctx);
  154                 INP_RLOCK(inp);
  155                 return (in_pcbrele_rlocked(inp));
  156         }
  157 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  158         /* Check AH/ESP integrity. */
  159         if (IPSEC_ENABLED(ipv6)) {
  160                 if (IPSEC_CHECK_POLICY(ipv6, n, inp) != 0) {
  161                         m_freem(n);
  162                         return (0);
  163                 }
  164         }
  165 #endif /* IPSEC */
  166 #ifdef MAC
  167         if (mac_inpcb_check_deliver(inp, n) != 0) {
  168                 m_freem(n);
  169                 return (0);
  170         }
  171 #endif
  172         opts = NULL;
  173         if (inp->inp_flags & INP_CONTROLOPTS ||
  174             inp->inp_socket->so_options & SO_TIMESTAMP)
  175                 ip6_savecontrol(inp, n, &opts);
  176         if ((inp->inp_vflag & INP_IPV6) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
  177                 tmp_opts = sbcreatecontrol((caddr_t)&fromsa[1],
  178                         sizeof(struct sockaddr_in6), IPV6_ORIGDSTADDR, IPPROTO_IPV6);
  179                 if (tmp_opts) {
  180                         if (opts) {
  181                                 tmp_opts->m_next = opts;
  182                                 opts = tmp_opts;
  183                         } else
  184                                 opts = tmp_opts;
  185                 }
  186 
  187         }
  188         m_adj(n, off + sizeof(struct udphdr));
  189 
  190         so = inp->inp_socket;
  191         SOCKBUF_LOCK(&so->so_rcv);
  192         if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&fromsa[0], n,
  193             opts) == 0) {
  194                 SOCKBUF_UNLOCK(&so->so_rcv);
  195                 m_freem(n);
  196                 if (opts)
  197                         m_freem(opts);
  198                 UDPSTAT_INC(udps_fullsock);
  199         } else
  200                 sorwakeup_locked(so);
  201         return (0);
  202 }
  203 
  204 int
  205 udp6_input(struct mbuf **mp, int *offp, int proto)
  206 {
  207         struct mbuf *m = *mp;
  208         struct ifnet *ifp;
  209         struct ip6_hdr *ip6;
  210         struct udphdr *uh;
  211         struct inpcb *inp;
  212         struct inpcbinfo *pcbinfo;
  213         struct udpcb *up;
  214         int off = *offp;
  215         int cscov_partial;
  216         int plen, ulen;
  217         struct epoch_tracker et;
  218         struct sockaddr_in6 fromsa[2];
  219         struct m_tag *fwd_tag;
  220         uint16_t uh_sum;
  221         uint8_t nxt;
  222 
  223         ifp = m->m_pkthdr.rcvif;
  224 
  225 #ifndef PULLDOWN_TEST
  226         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
  227         ip6 = mtod(m, struct ip6_hdr *);
  228         uh = (struct udphdr *)((caddr_t)ip6 + off);
  229 #else
  230         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
  231         if (!uh)
  232                 return (IPPROTO_DONE);
  233         ip6 = mtod(m, struct ip6_hdr *);
  234 #endif
  235 
  236         UDPSTAT_INC(udps_ipackets);
  237 
  238         /*
  239          * Destination port of 0 is illegal, based on RFC768.
  240          */
  241         if (uh->uh_dport == 0)
  242                 goto badunlocked;
  243 
  244         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
  245         ulen = ntohs((u_short)uh->uh_ulen);
  246 
  247         nxt = proto;
  248         cscov_partial = (nxt == IPPROTO_UDPLITE) ? 1 : 0;
  249         if (nxt == IPPROTO_UDPLITE) {
  250                 /* Zero means checksum over the complete packet. */
  251                 if (ulen == 0)
  252                         ulen = plen;
  253                 if (ulen == plen)
  254                         cscov_partial = 0;
  255                 if ((ulen < sizeof(struct udphdr)) || (ulen > plen)) {
  256                         /* XXX: What is the right UDPLite MIB counter? */
  257                         goto badunlocked;
  258                 }
  259                 if (uh->uh_sum == 0) {
  260                         /* XXX: What is the right UDPLite MIB counter? */
  261                         goto badunlocked;
  262                 }
  263         } else {
  264                 if ((ulen < sizeof(struct udphdr)) || (plen != ulen)) {
  265                         UDPSTAT_INC(udps_badlen);
  266                         goto badunlocked;
  267                 }
  268                 if (uh->uh_sum == 0) {
  269                         UDPSTAT_INC(udps_nosum);
  270                         goto badunlocked;
  271                 }
  272         }
  273 
  274         if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID_IPV6) &&
  275             !cscov_partial) {
  276                 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
  277                         uh_sum = m->m_pkthdr.csum_data;
  278                 else
  279                         uh_sum = in6_cksum_pseudo(ip6, ulen, nxt,
  280                             m->m_pkthdr.csum_data);
  281                 uh_sum ^= 0xffff;
  282         } else
  283                 uh_sum = in6_cksum_partial(m, nxt, off, plen, ulen);
  284 
  285         if (uh_sum != 0) {
  286                 UDPSTAT_INC(udps_badsum);
  287                 goto badunlocked;
  288         }
  289 
  290         /*
  291          * Construct sockaddr format source address.
  292          */
  293         init_sin6(&fromsa[0], m, 0);
  294         fromsa[0].sin6_port = uh->uh_sport;
  295         init_sin6(&fromsa[1], m, 1);
  296         fromsa[1].sin6_port = uh->uh_dport;
  297 
  298         pcbinfo = udp_get_inpcbinfo(nxt);
  299         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  300                 struct inpcb *last;
  301                 struct inpcbhead *pcblist;
  302                 struct ip6_moptions *imo;
  303 
  304                 INP_INFO_RLOCK_ET(pcbinfo, et);
  305                 /*
  306                  * In the event that laddr should be set to the link-local
  307                  * address (this happens in RIPng), the multicast address
  308                  * specified in the received packet will not match laddr.  To
  309                  * handle this situation, matching is relaxed if the
  310                  * receiving interface is the same as one specified in the
  311                  * socket and if the destination multicast address matches
  312                  * one of the multicast groups specified in the socket.
  313                  */
  314 
  315                 /*
  316                  * KAME note: traditionally we dropped udpiphdr from mbuf
  317                  * here.  We need udphdr for IPsec processing so we do that
  318                  * later.
  319                  */
  320                 pcblist = udp_get_pcblist(nxt);
  321                 last = NULL;
  322                 CK_LIST_FOREACH(inp, pcblist, inp_list) {
  323                         if ((inp->inp_vflag & INP_IPV6) == 0)
  324                                 continue;
  325                         if (inp->inp_lport != uh->uh_dport)
  326                                 continue;
  327                         if (inp->inp_fport != 0 &&
  328                             inp->inp_fport != uh->uh_sport)
  329                                 continue;
  330                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  331                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  332                                                         &ip6->ip6_dst))
  333                                         continue;
  334                         }
  335                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  336                                 if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  337                                                         &ip6->ip6_src) ||
  338                                     inp->inp_fport != uh->uh_sport)
  339                                         continue;
  340                         }
  341 
  342                         /*
  343                          * XXXRW: Because we weren't holding either the inpcb
  344                          * or the hash lock when we checked for a match 
  345                          * before, we should probably recheck now that the 
  346                          * inpcb lock is (supposed to be) held.
  347                          */
  348 
  349                         /*
  350                          * Handle socket delivery policy for any-source
  351                          * and source-specific multicast. [RFC3678]
  352                          */
  353                         imo = inp->in6p_moptions;
  354                         if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
  355                                 struct sockaddr_in6      mcaddr;
  356                                 int                      blocked;
  357 
  358                                 INP_RLOCK(inp);
  359                                 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
  360                                         INP_RUNLOCK(inp);
  361                                         continue;
  362                                 }
  363 
  364                                 bzero(&mcaddr, sizeof(struct sockaddr_in6));
  365                                 mcaddr.sin6_len = sizeof(struct sockaddr_in6);
  366                                 mcaddr.sin6_family = AF_INET6;
  367                                 mcaddr.sin6_addr = ip6->ip6_dst;
  368 
  369                                 blocked = im6o_mc_filter(imo, ifp,
  370                                         (struct sockaddr *)&mcaddr,
  371                                         (struct sockaddr *)&fromsa[0]);
  372                                 if (blocked != MCAST_PASS) {
  373                                         if (blocked == MCAST_NOTGMEMBER)
  374                                                 IP6STAT_INC(ip6s_notmember);
  375                                         if (blocked == MCAST_NOTSMEMBER ||
  376                                             blocked == MCAST_MUTED)
  377                                                 UDPSTAT_INC(udps_filtermcast);
  378                                         INP_RUNLOCK(inp); /* XXX */
  379                                         continue;
  380                                 }
  381 
  382                                 INP_RUNLOCK(inp);
  383                         }
  384                         if (last != NULL) {
  385                                 struct mbuf *n;
  386 
  387                                 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) !=
  388                                     NULL) {
  389                                         INP_RLOCK(last);
  390                                         if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
  391                                                 if (nxt == IPPROTO_UDPLITE)
  392                                                         UDPLITE_PROBE(receive, NULL, last,
  393                                                             ip6, last, uh);
  394                                                 else
  395                                                         UDP_PROBE(receive, NULL, last,
  396                                                             ip6, last, uh);
  397                                                 if (udp6_append(last, n, off, fromsa))
  398                                                         goto inp_lost;
  399                                         }
  400                                         INP_RUNLOCK(last);
  401                                 }
  402                         }
  403                         last = inp;
  404                         /*
  405                          * Don't look for additional matches if this one does
  406                          * not have either the SO_REUSEPORT or SO_REUSEADDR
  407                          * socket options set.  This heuristic avoids
  408                          * searching through all pcbs in the common case of a
  409                          * non-shared port.  It assumes that an application
  410                          * will never clear these options after setting them.
  411                          */
  412                         if ((last->inp_socket->so_options &
  413                              (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0)
  414                                 break;
  415                 }
  416 
  417                 if (last == NULL) {
  418                         /*
  419                          * No matching pcb found; discard datagram.  (No need
  420                          * to send an ICMP Port Unreachable for a broadcast
  421                          * or multicast datgram.)
  422                          */
  423                         UDPSTAT_INC(udps_noport);
  424                         UDPSTAT_INC(udps_noportmcast);
  425                         goto badheadlocked;
  426                 }
  427                 INP_RLOCK(last);
  428                 if (__predict_true(last->inp_flags2 & INP_FREED) == 0) {
  429                         if (nxt == IPPROTO_UDPLITE)
  430                                 UDPLITE_PROBE(receive, NULL, last, ip6, last, uh);
  431                         else
  432                                 UDP_PROBE(receive, NULL, last, ip6, last, uh);
  433                         if (udp6_append(last, m, off, fromsa) == 0)
  434                                 INP_RUNLOCK(last);
  435                 } else
  436                         INP_RUNLOCK(last);
  437         inp_lost:
  438                 INP_INFO_RUNLOCK_ET(pcbinfo, et);
  439                 return (IPPROTO_DONE);
  440         }
  441         /*
  442          * Locate pcb for datagram.
  443          */
  444 
  445         /*
  446          * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
  447          */
  448         if ((m->m_flags & M_IP6_NEXTHOP) &&
  449             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
  450                 struct sockaddr_in6 *next_hop6;
  451 
  452                 next_hop6 = (struct sockaddr_in6 *)(fwd_tag + 1);
  453 
  454                 /*
  455                  * Transparently forwarded. Pretend to be the destination.
  456                  * Already got one like this?
  457                  */
  458                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
  459                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  460                     INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif, m);
  461                 if (!inp) {
  462                         /*
  463                          * It's new.  Try to find the ambushing socket.
  464                          * Because we've rewritten the destination address,
  465                          * any hardware-generated hash is ignored.
  466                          */
  467                         inp = in6_pcblookup(pcbinfo, &ip6->ip6_src,
  468                             uh->uh_sport, &next_hop6->sin6_addr,
  469                             next_hop6->sin6_port ? htons(next_hop6->sin6_port) :
  470                             uh->uh_dport, INPLOOKUP_WILDCARD |
  471                             INPLOOKUP_RLOCKPCB, m->m_pkthdr.rcvif);
  472                 }
  473                 /* Remove the tag from the packet. We don't need it anymore. */
  474                 m_tag_delete(m, fwd_tag);
  475                 m->m_flags &= ~M_IP6_NEXTHOP;
  476         } else
  477                 inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_src,
  478                     uh->uh_sport, &ip6->ip6_dst, uh->uh_dport,
  479                     INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  480                     m->m_pkthdr.rcvif, m);
  481         if (inp == NULL) {
  482                 if (udp_log_in_vain) {
  483                         char ip6bufs[INET6_ADDRSTRLEN];
  484                         char ip6bufd[INET6_ADDRSTRLEN];
  485 
  486                         log(LOG_INFO,
  487                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
  488                             ip6_sprintf(ip6bufd, &ip6->ip6_dst),
  489                             ntohs(uh->uh_dport),
  490                             ip6_sprintf(ip6bufs, &ip6->ip6_src),
  491                             ntohs(uh->uh_sport));
  492                 }
  493                 if (nxt == IPPROTO_UDPLITE)
  494                         UDPLITE_PROBE(receive, NULL, NULL, ip6, NULL, uh);
  495                 else
  496                         UDP_PROBE(receive, NULL, NULL, ip6, NULL, uh);
  497                 UDPSTAT_INC(udps_noport);
  498                 if (m->m_flags & M_MCAST) {
  499                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
  500                         UDPSTAT_INC(udps_noportmcast);
  501                         goto badunlocked;
  502                 }
  503                 if (V_udp_blackhole)
  504                         goto badunlocked;
  505                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
  506                 return (IPPROTO_DONE);
  507         }
  508         INP_RLOCK_ASSERT(inp);
  509         up = intoudpcb(inp);
  510         if (cscov_partial) {
  511                 if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
  512                         INP_RUNLOCK(inp);
  513                         m_freem(m);
  514                         return (IPPROTO_DONE);
  515                 }
  516         }
  517         if (nxt == IPPROTO_UDPLITE)
  518                 UDPLITE_PROBE(receive, NULL, inp, ip6, inp, uh);
  519         else
  520                 UDP_PROBE(receive, NULL, inp, ip6, inp, uh);
  521         if (udp6_append(inp, m, off, fromsa) == 0)
  522                 INP_RUNLOCK(inp);
  523         return (IPPROTO_DONE);
  524 
  525 badheadlocked:
  526         INP_INFO_RUNLOCK_ET(pcbinfo, et);
  527 badunlocked:
  528         if (m)
  529                 m_freem(m);
  530         return (IPPROTO_DONE);
  531 }
  532 
  533 static void
  534 udp6_common_ctlinput(int cmd, struct sockaddr *sa, void *d,
  535     struct inpcbinfo *pcbinfo)
  536 {
  537         struct udphdr uh;
  538         struct ip6_hdr *ip6;
  539         struct mbuf *m;
  540         int off = 0;
  541         struct ip6ctlparam *ip6cp = NULL;
  542         const struct sockaddr_in6 *sa6_src = NULL;
  543         void *cmdarg;
  544         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
  545         struct udp_portonly {
  546                 u_int16_t uh_sport;
  547                 u_int16_t uh_dport;
  548         } *uhp;
  549 
  550         if (sa->sa_family != AF_INET6 ||
  551             sa->sa_len != sizeof(struct sockaddr_in6))
  552                 return;
  553 
  554         if ((unsigned)cmd >= PRC_NCMDS)
  555                 return;
  556         if (PRC_IS_REDIRECT(cmd))
  557                 notify = in6_rtchange, d = NULL;
  558         else if (cmd == PRC_HOSTDEAD)
  559                 d = NULL;
  560         else if (inet6ctlerrmap[cmd] == 0)
  561                 return;
  562 
  563         /* if the parameter is from icmp6, decode it. */
  564         if (d != NULL) {
  565                 ip6cp = (struct ip6ctlparam *)d;
  566                 m = ip6cp->ip6c_m;
  567                 ip6 = ip6cp->ip6c_ip6;
  568                 off = ip6cp->ip6c_off;
  569                 cmdarg = ip6cp->ip6c_cmdarg;
  570                 sa6_src = ip6cp->ip6c_src;
  571         } else {
  572                 m = NULL;
  573                 ip6 = NULL;
  574                 cmdarg = NULL;
  575                 sa6_src = &sa6_any;
  576         }
  577 
  578         if (ip6) {
  579                 /*
  580                  * XXX: We assume that when IPV6 is non NULL,
  581                  * M and OFF are valid.
  582                  */
  583 
  584                 /* Check if we can safely examine src and dst ports. */
  585                 if (m->m_pkthdr.len < off + sizeof(*uhp))
  586                         return;
  587 
  588                 bzero(&uh, sizeof(uh));
  589                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
  590 
  591                 if (!PRC_IS_REDIRECT(cmd)) {
  592                         /* Check to see if its tunneled */
  593                         struct inpcb *inp;
  594                         inp = in6_pcblookup_mbuf(pcbinfo, &ip6->ip6_dst,
  595                             uh.uh_dport, &ip6->ip6_src, uh.uh_sport,
  596                             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB,
  597                             m->m_pkthdr.rcvif, m);
  598                         if (inp != NULL) {
  599                                 struct udpcb *up;
  600                                 
  601                                 up = intoudpcb(inp);
  602                                 if (up->u_icmp_func) {
  603                                         /* Yes it is. */
  604                                         INP_RUNLOCK(inp);
  605                                         (*up->u_icmp_func)(cmd, (struct sockaddr *)ip6cp->ip6c_src,
  606                                               d, up->u_tun_ctx);
  607                                         return;
  608                                 } else {
  609                                         /* Can't find it. */
  610                                         INP_RUNLOCK(inp);
  611                                 }
  612                         }
  613                 }
  614                 (void)in6_pcbnotify(pcbinfo, sa, uh.uh_dport,
  615                     (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd,
  616                     cmdarg, notify);
  617         } else
  618                 (void)in6_pcbnotify(pcbinfo, sa, 0,
  619                     (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
  620 }
  621 
  622 void
  623 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  624 {
  625 
  626         return (udp6_common_ctlinput(cmd, sa, d, &V_udbinfo));
  627 }
  628 
  629 void
  630 udplite6_ctlinput(int cmd, struct sockaddr *sa, void *d)
  631 {
  632 
  633         return (udp6_common_ctlinput(cmd, sa, d, &V_ulitecbinfo));
  634 }
  635 
  636 static int
  637 udp6_getcred(SYSCTL_HANDLER_ARGS)
  638 {
  639         struct xucred xuc;
  640         struct sockaddr_in6 addrs[2];
  641         struct inpcb *inp;
  642         int error;
  643 
  644         error = priv_check(req->td, PRIV_NETINET_GETCRED);
  645         if (error)
  646                 return (error);
  647 
  648         if (req->newlen != sizeof(addrs))
  649                 return (EINVAL);
  650         if (req->oldlen != sizeof(struct xucred))
  651                 return (EINVAL);
  652         error = SYSCTL_IN(req, addrs, sizeof(addrs));
  653         if (error)
  654                 return (error);
  655         if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
  656             (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
  657                 return (error);
  658         }
  659         inp = in6_pcblookup(&V_udbinfo, &addrs[1].sin6_addr,
  660             addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port,
  661             INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
  662         if (inp != NULL) {
  663                 INP_RLOCK_ASSERT(inp);
  664                 if (inp->inp_socket == NULL)
  665                         error = ENOENT;
  666                 if (error == 0)
  667                         error = cr_canseesocket(req->td->td_ucred,
  668                             inp->inp_socket);
  669                 if (error == 0)
  670                         cru2x(inp->inp_cred, &xuc);
  671                 INP_RUNLOCK(inp);
  672         } else
  673                 error = ENOENT;
  674         if (error == 0)
  675                 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
  676         return (error);
  677 }
  678 
  679 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0,
  680     0, udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
  681 
  682 #define UH_WLOCKED      2
  683 #define UH_RLOCKED      1
  684 #define UH_UNLOCKED     0
  685 static int
  686 udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
  687     struct sockaddr *addr6, struct mbuf *control, struct thread *td)
  688 {
  689         struct inpcbinfo *pcbinfo;
  690         struct inpcb *inp;
  691         struct ip6_hdr *ip6;
  692         struct udphdr *udp6;
  693         struct in6_addr *laddr, *faddr, in6a;
  694         struct ip6_pktopts *optp, opt;
  695         struct sockaddr_in6 *sin6, tmp;
  696         struct epoch_tracker et;
  697         int cscov_partial, error, flags, hlen, scope_ambiguous;
  698         u_int32_t ulen, plen;
  699         uint16_t cscov;
  700         u_short fport;
  701         uint8_t nxt, unlock_inp, unlock_udbinfo;
  702 
  703         /* addr6 has been validated in udp6_send(). */
  704         sin6 = (struct sockaddr_in6 *)addr6;
  705 
  706         /*
  707          * In contrast to to IPv4 we do not validate the max. packet length
  708          * here due to IPv6 Jumbograms (RFC2675).
  709          */
  710 
  711         scope_ambiguous = 0;
  712         if (sin6) {
  713                 /* Protect *addr6 from overwrites. */
  714                 tmp = *sin6;
  715                 sin6 = &tmp;
  716 
  717                 /*
  718                  * Application should provide a proper zone ID or the use of
  719                  * default zone IDs should be enabled.  Unfortunately, some
  720                  * applications do not behave as it should, so we need a
  721                  * workaround.  Even if an appropriate ID is not determined,
  722                  * we'll see if we can determine the outgoing interface.  If we
  723                  * can, determine the zone ID based on the interface below.
  724                  */
  725                 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  726                         scope_ambiguous = 1;
  727                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) {
  728                         if (control)
  729                                 m_freem(control);
  730                         m_freem(m);
  731                         return (error);
  732                 }
  733         }
  734 
  735         inp = sotoinpcb(so);
  736         KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
  737         /*
  738          * In the following cases we want a write lock on the inp for either
  739          * local operations or for possible route cache updates in the IPv6
  740          * output path:
  741          * - on connected sockets (sin6 is NULL) for route cache updates,
  742          * - when we are not bound to an address and source port (it is
  743          *   in6_pcbsetport() which will require the write lock).
  744          */
  745         if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
  746             inp->inp_lport == 0)) {
  747                 INP_WLOCK(inp);
  748                 unlock_inp = UH_WLOCKED;
  749         } else {
  750                 INP_RLOCK(inp);
  751                 unlock_inp = UH_RLOCKED;
  752         }
  753         nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
  754             IPPROTO_UDP : IPPROTO_UDPLITE;
  755 
  756 #ifdef INET
  757         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  758                 int hasv4addr;
  759 
  760                 if (sin6 == NULL)
  761                         hasv4addr = (inp->inp_vflag & INP_IPV4);
  762                 else
  763                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
  764                             ? 1 : 0;
  765                 if (hasv4addr) {
  766                         struct pr_usrreqs *pru;
  767 
  768                         /*
  769                          * XXXRW: We release UDP-layer locks before calling
  770                          * udp_send() in order to avoid recursion.  However,
  771                          * this does mean there is a short window where inp's
  772                          * fields are unstable.  Could this lead to a
  773                          * potential race in which the factors causing us to
  774                          * select the UDPv4 output routine are invalidated?
  775                          */
  776                         if (unlock_inp == UH_WLOCKED)
  777                                 INP_WUNLOCK(inp);
  778                         else
  779                                 INP_RUNLOCK(inp);
  780                         if (sin6)
  781                                 in6_sin6_2_sin_in_sock((struct sockaddr *)sin6);
  782                         pru = inetsw[ip_protox[nxt]].pr_usrreqs;
  783                         /* addr will just be freed in sendit(). */
  784                         return ((*pru->pru_send)(so, flags_arg, m,
  785                             (struct sockaddr *)sin6, control, td));
  786                 }
  787         } else
  788 #endif
  789         if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
  790                 /*
  791                  * Given this is either an IPv6-only socket or no INET is
  792                  * supported we will fail the send if the given destination
  793                  * address is a v4mapped address.
  794                  */
  795                 if (unlock_inp == UH_WLOCKED)
  796                         INP_WUNLOCK(inp);
  797                 else
  798                         INP_RUNLOCK(inp);
  799                 return (EINVAL);
  800         }
  801 
  802         if (control) {
  803                 if ((error = ip6_setpktopts(control, &opt,
  804                     inp->in6p_outputopts, td->td_ucred, nxt)) != 0) {
  805                         if (unlock_inp == UH_WLOCKED)
  806                                 INP_WUNLOCK(inp);
  807                         else
  808                                 INP_RUNLOCK(inp);
  809                         ip6_clearpktopts(&opt, -1);
  810                         if (control)
  811                                 m_freem(control);
  812                         m_freem(m);
  813                         return (error);
  814                 }
  815                 optp = &opt;
  816         } else
  817                 optp = inp->in6p_outputopts;
  818 
  819         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
  820         if (sin6 != NULL &&
  821             IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && inp->inp_lport == 0) {
  822                 INP_HASH_WLOCK(pcbinfo);
  823                 unlock_udbinfo = UH_WLOCKED;
  824         } else if (sin6 != NULL &&
  825             (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
  826             IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ||
  827             inp->inp_lport == 0)) {
  828                 INP_HASH_RLOCK_ET(pcbinfo, et);
  829                 unlock_udbinfo = UH_RLOCKED;
  830         } else
  831                 unlock_udbinfo = UH_UNLOCKED;
  832 
  833         if (sin6) {
  834 
  835                 /*
  836                  * Since we saw no essential reason for calling in_pcbconnect,
  837                  * we get rid of such kind of logic, and call in6_selectsrc
  838                  * and in6_pcbsetport in order to fill in the local address
  839                  * and the local port.
  840                  */
  841                 if (sin6->sin6_port == 0) {
  842                         error = EADDRNOTAVAIL;
  843                         goto release;
  844                 }
  845 
  846                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  847                         /* how about ::ffff:0.0.0.0 case? */
  848                         error = EISCONN;
  849                         goto release;
  850                 }
  851 
  852                 /*
  853                  * Given we handle the v4mapped case in the INET block above
  854                  * assert here that it must not happen anymore.
  855                  */
  856                 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
  857                     ("%s: sin6(%p)->sin6_addr is v4mapped which we "
  858                     "should have handled.", __func__, sin6));
  859 
  860                 /* This only requires read-locking. */
  861                 error = in6_selectsrc_socket(sin6, optp, inp,
  862                     td->td_ucred, scope_ambiguous, &in6a, NULL);
  863                 if (error)
  864                         goto release;
  865                 laddr = &in6a;
  866 
  867                 if (inp->inp_lport == 0) {
  868 
  869                         INP_WLOCK_ASSERT(inp);
  870                         error = in6_pcbsetport(laddr, inp, td->td_ucred);
  871                         if (error != 0) {
  872                                 /* Undo an address bind that may have occurred. */
  873                                 inp->in6p_laddr = in6addr_any;
  874                                 goto release;
  875                         }
  876                 }
  877                 faddr = &sin6->sin6_addr;
  878                 fport = sin6->sin6_port; /* allow 0 port */
  879 
  880         } else {
  881                 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
  882                         error = ENOTCONN;
  883                         goto release;
  884                 }
  885                 laddr = &inp->in6p_laddr;
  886                 faddr = &inp->in6p_faddr;
  887                 fport = inp->inp_fport;
  888         }
  889 
  890         ulen = m->m_pkthdr.len;
  891         plen = sizeof(struct udphdr) + ulen;
  892         hlen = sizeof(struct ip6_hdr);
  893 
  894         /*
  895          * Calculate data length and get a mbuf
  896          * for UDP and IP6 headers.
  897          */
  898         M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
  899         if (m == NULL) {
  900                 error = ENOBUFS;
  901                 goto release;
  902         }
  903 
  904         /*
  905          * Stuff checksum and output datagram.
  906          */
  907         cscov = cscov_partial = 0;
  908         udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
  909         udp6->uh_sport = inp->inp_lport; /* lport is always set in the PCB */
  910         udp6->uh_dport = fport;
  911         if (nxt == IPPROTO_UDPLITE) {
  912                 struct udpcb *up;
  913 
  914                 up = intoudpcb(inp);
  915                 cscov = up->u_txcslen;
  916                 if (cscov >= plen)
  917                         cscov = 0;
  918                 udp6->uh_ulen = htons(cscov);
  919                 /*
  920                  * For UDP-Lite, checksum coverage length of zero means
  921                  * the entire UDPLite packet is covered by the checksum.
  922                  */
  923                 cscov_partial = (cscov == 0) ? 0 : 1;
  924         } else if (plen <= 0xffff)
  925                 udp6->uh_ulen = htons((u_short)plen);
  926         else
  927                 udp6->uh_ulen = 0;
  928         udp6->uh_sum = 0;
  929 
  930         ip6 = mtod(m, struct ip6_hdr *);
  931         ip6->ip6_flow   = inp->inp_flow & IPV6_FLOWINFO_MASK;
  932         ip6->ip6_vfc    &= ~IPV6_VERSION_MASK;
  933         ip6->ip6_vfc    |= IPV6_VERSION;
  934         ip6->ip6_plen   = htons((u_short)plen);
  935         ip6->ip6_nxt    = nxt;
  936         ip6->ip6_hlim   = in6_selecthlim(inp, NULL);
  937         ip6->ip6_src    = *laddr;
  938         ip6->ip6_dst    = *faddr;
  939 
  940 #ifdef MAC
  941         mac_inpcb_create_mbuf(inp, m);
  942 #endif
  943 
  944         if (cscov_partial) {
  945                 if ((udp6->uh_sum = in6_cksum_partial(m, nxt,
  946                     sizeof(struct ip6_hdr), plen, cscov)) == 0)
  947                         udp6->uh_sum = 0xffff;
  948         } else {
  949                 udp6->uh_sum = in6_cksum_pseudo(ip6, plen, nxt, 0);
  950                 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
  951                 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
  952         }
  953 
  954         flags = 0;
  955 #ifdef  RSS
  956         {
  957                 uint32_t hash_val, hash_type;
  958                 uint8_t pr;
  959 
  960                 pr = inp->inp_socket->so_proto->pr_protocol;
  961                 /*
  962                  * Calculate an appropriate RSS hash for UDP and
  963                  * UDP Lite.
  964                  *
  965                  * The called function will take care of figuring out
  966                  * whether a 2-tuple or 4-tuple hash is required based
  967                  * on the currently configured scheme.
  968                  *
  969                  * Later later on connected socket values should be
  970                  * cached in the inpcb and reused, rather than constantly
  971                  * re-calculating it.
  972                  *
  973                  * UDP Lite is a different protocol number and will
  974                  * likely end up being hashed as a 2-tuple until
  975                  * RSS / NICs grow UDP Lite protocol awareness.
  976                  */
  977                 if (rss_proto_software_hash_v6(faddr, laddr, fport,
  978                     inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
  979                         m->m_pkthdr.flowid = hash_val;
  980                         M_HASHTYPE_SET(m, hash_type);
  981                 }
  982 
  983                 /*
  984                  * Don't override with the inp cached flowid.
  985                  *
  986                  * Until the whole UDP path is vetted, it may actually
  987                  * be incorrect.
  988                  */
  989                 flags |= IP_NODEFAULTFLOWID;
  990         }
  991 #endif
  992 
  993         UDPSTAT_INC(udps_opackets);
  994         if (unlock_udbinfo == UH_WLOCKED)
  995                 INP_HASH_WUNLOCK(pcbinfo);
  996         else if (unlock_udbinfo == UH_RLOCKED)
  997                 INP_HASH_RUNLOCK_ET(pcbinfo, et);
  998         if (nxt == IPPROTO_UDPLITE)
  999                 UDPLITE_PROBE(send, NULL, inp, ip6, inp, udp6);
 1000         else
 1001                 UDP_PROBE(send, NULL, inp, ip6, inp, udp6);
 1002         error = ip6_output(m, optp,
 1003             (unlock_inp == UH_WLOCKED) ? &inp->inp_route6 : NULL, flags,
 1004             inp->in6p_moptions, NULL, inp);
 1005         if (unlock_inp == UH_WLOCKED)
 1006                 INP_WUNLOCK(inp);
 1007         else
 1008                 INP_RUNLOCK(inp);
 1009 
 1010         if (control) {
 1011                 ip6_clearpktopts(&opt, -1);
 1012                 m_freem(control);
 1013         }
 1014         return (error);
 1015 
 1016 release:
 1017         if (unlock_udbinfo == UH_WLOCKED) {
 1018                 KASSERT(unlock_inp == UH_WLOCKED, ("%s: excl udbinfo lock, "
 1019                     "non-excl inp lock: pcbinfo %p %#x inp %p %#x",
 1020                     __func__, pcbinfo, unlock_udbinfo, inp, unlock_inp));
 1021                 INP_HASH_WUNLOCK(pcbinfo);
 1022                 INP_WUNLOCK(inp);
 1023         } else if (unlock_udbinfo == UH_RLOCKED) {
 1024                 KASSERT(unlock_inp == UH_RLOCKED, ("%s: non-excl udbinfo lock, "
 1025                     "excl inp lock: pcbinfo %p %#x inp %p %#x",
 1026                     __func__, pcbinfo, unlock_udbinfo, inp, unlock_inp));
 1027                 INP_HASH_RUNLOCK_ET(pcbinfo, et);
 1028                 INP_RUNLOCK(inp);
 1029         } else if (unlock_inp == UH_WLOCKED)
 1030                 INP_WUNLOCK(inp);
 1031         else
 1032                 INP_RUNLOCK(inp);
 1033         if (control) {
 1034                 ip6_clearpktopts(&opt, -1);
 1035                 m_freem(control);
 1036         }
 1037         m_freem(m);
 1038 
 1039         return (error);
 1040 }
 1041 
 1042 static void
 1043 udp6_abort(struct socket *so)
 1044 {
 1045         struct inpcb *inp;
 1046         struct inpcbinfo *pcbinfo;
 1047 
 1048         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1049         inp = sotoinpcb(so);
 1050         KASSERT(inp != NULL, ("udp6_abort: inp == NULL"));
 1051 
 1052         INP_WLOCK(inp);
 1053 #ifdef INET
 1054         if (inp->inp_vflag & INP_IPV4) {
 1055                 struct pr_usrreqs *pru;
 1056                 uint8_t nxt;
 1057 
 1058                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 1059                     IPPROTO_UDP : IPPROTO_UDPLITE;
 1060                 INP_WUNLOCK(inp);
 1061                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 1062                 (*pru->pru_abort)(so);
 1063                 return;
 1064         }
 1065 #endif
 1066 
 1067         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1068                 INP_HASH_WLOCK(pcbinfo);
 1069                 in6_pcbdisconnect(inp);
 1070                 inp->in6p_laddr = in6addr_any;
 1071                 INP_HASH_WUNLOCK(pcbinfo);
 1072                 soisdisconnected(so);
 1073         }
 1074         INP_WUNLOCK(inp);
 1075 }
 1076 
 1077 static int
 1078 udp6_attach(struct socket *so, int proto, struct thread *td)
 1079 {
 1080         struct inpcb *inp;
 1081         struct inpcbinfo *pcbinfo;
 1082         int error;
 1083 
 1084         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1085         inp = sotoinpcb(so);
 1086         KASSERT(inp == NULL, ("udp6_attach: inp != NULL"));
 1087 
 1088         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 1089                 error = soreserve(so, udp_sendspace, udp_recvspace);
 1090                 if (error)
 1091                         return (error);
 1092         }
 1093         INP_INFO_WLOCK(pcbinfo);
 1094         error = in_pcballoc(so, pcbinfo);
 1095         if (error) {
 1096                 INP_INFO_WUNLOCK(pcbinfo);
 1097                 return (error);
 1098         }
 1099         inp = (struct inpcb *)so->so_pcb;
 1100         inp->inp_vflag |= INP_IPV6;
 1101         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 1102                 inp->inp_vflag |= INP_IPV4;
 1103         inp->in6p_hops = -1;    /* use kernel default */
 1104         inp->in6p_cksum = -1;   /* just to be sure */
 1105         /*
 1106          * XXX: ugly!!
 1107          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 1108          * because the socket may be bound to an IPv6 wildcard address,
 1109          * which may match an IPv4-mapped IPv6 address.
 1110          */
 1111         inp->inp_ip_ttl = V_ip_defttl;
 1112 
 1113         error = udp_newudpcb(inp);
 1114         if (error) {
 1115                 in_pcbdetach(inp);
 1116                 in_pcbfree(inp);
 1117                 INP_INFO_WUNLOCK(pcbinfo);
 1118                 return (error);
 1119         }
 1120         INP_WUNLOCK(inp);
 1121         INP_INFO_WUNLOCK(pcbinfo);
 1122         return (0);
 1123 }
 1124 
 1125 static int
 1126 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 1127 {
 1128         struct inpcb *inp;
 1129         struct inpcbinfo *pcbinfo;
 1130         int error;
 1131 
 1132         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1133         inp = sotoinpcb(so);
 1134         KASSERT(inp != NULL, ("udp6_bind: inp == NULL"));
 1135 
 1136         INP_WLOCK(inp);
 1137         INP_HASH_WLOCK(pcbinfo);
 1138         inp->inp_vflag &= ~INP_IPV4;
 1139         inp->inp_vflag |= INP_IPV6;
 1140         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 1141                 struct sockaddr_in6 *sin6_p;
 1142 
 1143                 sin6_p = (struct sockaddr_in6 *)nam;
 1144 
 1145                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 1146                         inp->inp_vflag |= INP_IPV4;
 1147 #ifdef INET
 1148                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 1149                         struct sockaddr_in sin;
 1150 
 1151                         in6_sin6_2_sin(&sin, sin6_p);
 1152                         inp->inp_vflag |= INP_IPV4;
 1153                         inp->inp_vflag &= ~INP_IPV6;
 1154                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 1155                             td->td_ucred);
 1156                         goto out;
 1157                 }
 1158 #endif
 1159         }
 1160 
 1161         error = in6_pcbbind(inp, nam, td->td_ucred);
 1162 #ifdef INET
 1163 out:
 1164 #endif
 1165         INP_HASH_WUNLOCK(pcbinfo);
 1166         INP_WUNLOCK(inp);
 1167         return (error);
 1168 }
 1169 
 1170 static void
 1171 udp6_close(struct socket *so)
 1172 {
 1173         struct inpcb *inp;
 1174         struct inpcbinfo *pcbinfo;
 1175 
 1176         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1177         inp = sotoinpcb(so);
 1178         KASSERT(inp != NULL, ("udp6_close: inp == NULL"));
 1179 
 1180         INP_WLOCK(inp);
 1181 #ifdef INET
 1182         if (inp->inp_vflag & INP_IPV4) {
 1183                 struct pr_usrreqs *pru;
 1184                 uint8_t nxt;
 1185 
 1186                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 1187                     IPPROTO_UDP : IPPROTO_UDPLITE;
 1188                 INP_WUNLOCK(inp);
 1189                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 1190                 (*pru->pru_disconnect)(so);
 1191                 return;
 1192         }
 1193 #endif
 1194         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1195                 INP_HASH_WLOCK(pcbinfo);
 1196                 in6_pcbdisconnect(inp);
 1197                 inp->in6p_laddr = in6addr_any;
 1198                 INP_HASH_WUNLOCK(pcbinfo);
 1199                 soisdisconnected(so);
 1200         }
 1201         INP_WUNLOCK(inp);
 1202 }
 1203 
 1204 static int
 1205 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 1206 {
 1207         struct inpcb *inp;
 1208         struct inpcbinfo *pcbinfo;
 1209         struct sockaddr_in6 *sin6;
 1210         int error;
 1211 
 1212         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1213         inp = sotoinpcb(so);
 1214         sin6 = (struct sockaddr_in6 *)nam;
 1215         KASSERT(inp != NULL, ("udp6_connect: inp == NULL"));
 1216 
 1217         /*
 1218          * XXXRW: Need to clarify locking of v4/v6 flags.
 1219          */
 1220         INP_WLOCK(inp);
 1221 #ifdef INET
 1222         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 1223                 struct sockaddr_in sin;
 1224 
 1225                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 1226                         error = EINVAL;
 1227                         goto out;
 1228                 }
 1229                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 1230                         error = EAFNOSUPPORT;
 1231                         goto out;
 1232                 }
 1233                 if (inp->inp_faddr.s_addr != INADDR_ANY) {
 1234                         error = EISCONN;
 1235                         goto out;
 1236                 }
 1237                 in6_sin6_2_sin(&sin, sin6);
 1238                 inp->inp_vflag |= INP_IPV4;
 1239                 inp->inp_vflag &= ~INP_IPV6;
 1240                 error = prison_remote_ip4(td->td_ucred, &sin.sin_addr);
 1241                 if (error != 0)
 1242                         goto out;
 1243                 INP_HASH_WLOCK(pcbinfo);
 1244                 error = in_pcbconnect(inp, (struct sockaddr *)&sin,
 1245                     td->td_ucred);
 1246                 INP_HASH_WUNLOCK(pcbinfo);
 1247                 if (error == 0)
 1248                         soisconnected(so);
 1249                 goto out;
 1250         } else {
 1251                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 1252                         error = EAFNOSUPPORT;
 1253                         goto out;
 1254                 }
 1255         }
 1256 #endif
 1257         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1258                 error = EISCONN;
 1259                 goto out;
 1260         }
 1261         inp->inp_vflag &= ~INP_IPV4;
 1262         inp->inp_vflag |= INP_IPV6;
 1263         error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr);
 1264         if (error != 0)
 1265                 goto out;
 1266         INP_HASH_WLOCK(pcbinfo);
 1267         error = in6_pcbconnect(inp, nam, td->td_ucred);
 1268         INP_HASH_WUNLOCK(pcbinfo);
 1269         if (error == 0)
 1270                 soisconnected(so);
 1271 out:
 1272         INP_WUNLOCK(inp);
 1273         return (error);
 1274 }
 1275 
 1276 static void
 1277 udp6_detach(struct socket *so)
 1278 {
 1279         struct inpcb *inp;
 1280         struct inpcbinfo *pcbinfo;
 1281         struct udpcb *up;
 1282 
 1283         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1284         inp = sotoinpcb(so);
 1285         KASSERT(inp != NULL, ("udp6_detach: inp == NULL"));
 1286 
 1287         INP_INFO_WLOCK(pcbinfo);
 1288         INP_WLOCK(inp);
 1289         up = intoudpcb(inp);
 1290         KASSERT(up != NULL, ("%s: up == NULL", __func__));
 1291         in_pcbdetach(inp);
 1292         in_pcbfree(inp);
 1293         INP_INFO_WUNLOCK(pcbinfo);
 1294         udp_discardcb(up);
 1295 }
 1296 
 1297 static int
 1298 udp6_disconnect(struct socket *so)
 1299 {
 1300         struct inpcb *inp;
 1301         struct inpcbinfo *pcbinfo;
 1302 
 1303         pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
 1304         inp = sotoinpcb(so);
 1305         KASSERT(inp != NULL, ("udp6_disconnect: inp == NULL"));
 1306 
 1307         INP_WLOCK(inp);
 1308 #ifdef INET
 1309         if (inp->inp_vflag & INP_IPV4) {
 1310                 struct pr_usrreqs *pru;
 1311                 uint8_t nxt;
 1312 
 1313                 nxt = (inp->inp_socket->so_proto->pr_protocol == IPPROTO_UDP) ?
 1314                     IPPROTO_UDP : IPPROTO_UDPLITE;
 1315                 INP_WUNLOCK(inp);
 1316                 pru = inetsw[ip_protox[nxt]].pr_usrreqs;
 1317                 (void)(*pru->pru_disconnect)(so);
 1318                 return (0);
 1319         }
 1320 #endif
 1321 
 1322         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 1323                 INP_WUNLOCK(inp);
 1324                 return (ENOTCONN);
 1325         }
 1326 
 1327         INP_HASH_WLOCK(pcbinfo);
 1328         in6_pcbdisconnect(inp);
 1329         inp->in6p_laddr = in6addr_any;
 1330         INP_HASH_WUNLOCK(pcbinfo);
 1331         SOCK_LOCK(so);
 1332         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 1333         SOCK_UNLOCK(so);
 1334         INP_WUNLOCK(inp);
 1335         return (0);
 1336 }
 1337 
 1338 static int
 1339 udp6_send(struct socket *so, int flags, struct mbuf *m,
 1340     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 1341 {
 1342         int error;
 1343 
 1344         if (addr) {
 1345                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 1346                         error = EINVAL;
 1347                         goto bad;
 1348                 }
 1349                 if (addr->sa_family != AF_INET6) {
 1350                         error = EAFNOSUPPORT;
 1351                         goto bad;
 1352                 }
 1353         }
 1354 
 1355         return (udp6_output(so, flags, m, addr, control, td));
 1356 
 1357 bad:
 1358         if (control)
 1359                 m_freem(control);
 1360         m_freem(m);
 1361         return (error);
 1362 }
 1363 
 1364 struct pr_usrreqs udp6_usrreqs = {
 1365         .pru_abort =            udp6_abort,
 1366         .pru_attach =           udp6_attach,
 1367         .pru_bind =             udp6_bind,
 1368         .pru_connect =          udp6_connect,
 1369         .pru_control =          in6_control,
 1370         .pru_detach =           udp6_detach,
 1371         .pru_disconnect =       udp6_disconnect,
 1372         .pru_peeraddr =         in6_mapped_peeraddr,
 1373         .pru_send =             udp6_send,
 1374         .pru_shutdown =         udp_shutdown,
 1375         .pru_sockaddr =         in6_mapped_sockaddr,
 1376         .pru_soreceive =        soreceive_dgram,
 1377         .pru_sosend =           sosend_dgram,
 1378         .pru_sosetlabel =       in_pcbsosetlabel,
 1379         .pru_close =            udp6_close
 1380 };

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