The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_socket.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1995 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 /* XXX we use functions that might not exist. */
   33 #include "opt_compat.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/proc.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/capsicum.h>
   41 #include <sys/fcntl.h>
   42 #include <sys/file.h>
   43 #include <sys/filedesc.h>
   44 #include <sys/limits.h>
   45 #include <sys/lock.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mutex.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/socket.h>
   50 #include <sys/socketvar.h>
   51 #include <sys/syscallsubr.h>
   52 #include <sys/uio.h>
   53 #include <sys/stat.h>
   54 #include <sys/syslog.h>
   55 #include <sys/un.h>
   56 #include <sys/unistd.h>
   57 
   58 #include <security/audit/audit.h>
   59 
   60 #include <net/if.h>
   61 #include <net/vnet.h>
   62 #include <netinet/in.h>
   63 #include <netinet/in_systm.h>
   64 #include <netinet/ip.h>
   65 #include <netinet/tcp.h>
   66 #ifdef INET6
   67 #include <netinet/ip6.h>
   68 #include <netinet6/ip6_var.h>
   69 #endif
   70 
   71 #ifdef COMPAT_LINUX32
   72 #include <machine/../linux32/linux.h>
   73 #include <machine/../linux32/linux32_proto.h>
   74 #else
   75 #include <machine/../linux/linux.h>
   76 #include <machine/../linux/linux_proto.h>
   77 #endif
   78 #include <compat/linux/linux_common.h>
   79 #include <compat/linux/linux_file.h>
   80 #include <compat/linux/linux_mib.h>
   81 #include <compat/linux/linux_socket.h>
   82 #include <compat/linux/linux_timer.h>
   83 #include <compat/linux/linux_util.h>
   84 
   85 static int linux_sendmsg_common(struct thread *, l_int, struct l_msghdr *,
   86                                         l_uint);
   87 static int linux_recvmsg_common(struct thread *, l_int, struct l_msghdr *,
   88                                         l_uint, struct msghdr *);
   89 static int linux_set_socket_flags(int, int *);
   90 
   91 static int
   92 linux_to_bsd_sockopt_level(int level)
   93 {
   94 
   95         if (level == LINUX_SOL_SOCKET)
   96                 return (SOL_SOCKET);
   97         /* Remaining values are RFC-defined protocol numbers. */
   98         return (level);
   99 }
  100 
  101 static int
  102 bsd_to_linux_sockopt_level(int level)
  103 {
  104 
  105         if (level == SOL_SOCKET)
  106                 return (LINUX_SOL_SOCKET);
  107         return (level);
  108 }
  109 
  110 static int
  111 linux_to_bsd_ip_sockopt(int opt)
  112 {
  113 
  114         switch (opt) {
  115         /* known and translated sockopts */
  116         case LINUX_IP_TOS:
  117                 return (IP_TOS);
  118         case LINUX_IP_TTL:
  119                 return (IP_TTL);
  120         case LINUX_IP_HDRINCL:
  121                 return (IP_HDRINCL);
  122         case LINUX_IP_OPTIONS:
  123                 return (IP_OPTIONS);
  124         case LINUX_IP_RECVOPTS:
  125                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVOPTS");
  126                 return (IP_RECVOPTS);
  127         case LINUX_IP_RETOPTS:
  128                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_REETOPTS");
  129                 return (IP_RETOPTS);
  130         case LINUX_IP_RECVTTL:
  131                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVTTL");
  132                 return (IP_RECVTTL);
  133         case LINUX_IP_RECVTOS:
  134                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_RECVTOS");
  135                 return (IP_RECVTOS);
  136         case LINUX_IP_FREEBIND:
  137                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_FREEBIND");
  138                 return (IP_BINDANY);
  139         case LINUX_IP_IPSEC_POLICY:
  140                 /* we have this option, but not documented in ip(4) manpage */
  141                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_IPSEC_POLICY");
  142                 return (IP_IPSEC_POLICY);
  143         case LINUX_IP_MINTTL:
  144                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MINTTL");
  145                 return (IP_MINTTL);
  146         case LINUX_IP_MULTICAST_IF:
  147                 return (IP_MULTICAST_IF);
  148         case LINUX_IP_MULTICAST_TTL:
  149                 return (IP_MULTICAST_TTL);
  150         case LINUX_IP_MULTICAST_LOOP:
  151                 return (IP_MULTICAST_LOOP);
  152         case LINUX_IP_ADD_MEMBERSHIP:
  153                 return (IP_ADD_MEMBERSHIP);
  154         case LINUX_IP_DROP_MEMBERSHIP:
  155                 return (IP_DROP_MEMBERSHIP);
  156         case LINUX_IP_UNBLOCK_SOURCE:
  157                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_UNBLOCK_SOURCE");
  158                 return (IP_UNBLOCK_SOURCE);
  159         case LINUX_IP_BLOCK_SOURCE:
  160                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_BLOCK_SOURCE");
  161                 return (IP_BLOCK_SOURCE);
  162         case LINUX_IP_ADD_SOURCE_MEMBERSHIP:
  163                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_ADD_SOURCE_MEMBERSHIP");
  164                 return (IP_ADD_SOURCE_MEMBERSHIP);
  165         case LINUX_IP_DROP_SOURCE_MEMBERSHIP:
  166                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_DROP_SOURCE_MEMBERSHIP");
  167                 return (IP_DROP_SOURCE_MEMBERSHIP);
  168         case LINUX_MCAST_JOIN_GROUP:
  169                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_JOIN_GROUP");
  170                 return (MCAST_JOIN_GROUP);
  171         case LINUX_MCAST_LEAVE_GROUP:
  172                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_LEAVE_GROUP");
  173                 return (MCAST_LEAVE_GROUP);
  174         case LINUX_MCAST_JOIN_SOURCE_GROUP:
  175                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_JOIN_SOURCE_GROUP");
  176                 return (MCAST_JOIN_SOURCE_GROUP);
  177         case LINUX_MCAST_LEAVE_SOURCE_GROUP:
  178                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv4 socket option IP_MCAST_LEAVE_SOURCE_GROUP");
  179                 return (MCAST_LEAVE_SOURCE_GROUP);
  180 
  181         /* known but not implemented sockopts */
  182         case LINUX_IP_ROUTER_ALERT:
  183                 LINUX_RATELIMIT_MSG_OPT1(
  184                     "unsupported IPv4 socket option IP_ROUTER_ALERT (%d), you can not do user-space routing from linux programs",
  185                     opt);
  186                 return (-2);
  187         case LINUX_IP_PKTINFO:
  188                 LINUX_RATELIMIT_MSG_OPT1(
  189                     "unsupported IPv4 socket option IP_PKTINFO (%d), you can not get extended packet info for datagram sockets in linux programs",
  190                     opt);
  191                 return (-2);
  192         case LINUX_IP_PKTOPTIONS:
  193                 LINUX_RATELIMIT_MSG_OPT1(
  194                     "unsupported IPv4 socket option IP_PKTOPTIONS (%d)",
  195                     opt);
  196                 return (-2);
  197         case LINUX_IP_MTU_DISCOVER:
  198                 LINUX_RATELIMIT_MSG_OPT1(
  199                     "unsupported IPv4 socket option IP_MTU_DISCOVER (%d), your linux program can not control path-MTU discovery",
  200                     opt);
  201                 return (-2);
  202         case LINUX_IP_RECVERR:
  203                 /* needed by steam */
  204                 LINUX_RATELIMIT_MSG_OPT1(
  205                     "unsupported IPv4 socket option IP_RECVERR (%d), you can not get extended reliability info in linux programs",
  206                     opt);
  207                 return (-2);
  208         case LINUX_IP_MTU:
  209                 LINUX_RATELIMIT_MSG_OPT1(
  210                     "unsupported IPv4 socket option IP_MTU (%d), your linux program can not control the MTU on this socket",
  211                     opt);
  212                 return (-2);
  213         case LINUX_IP_XFRM_POLICY:
  214                 LINUX_RATELIMIT_MSG_OPT1(
  215                     "unsupported IPv4 socket option IP_XFRM_POLICY (%d)",
  216                     opt);
  217                 return (-2);
  218         case LINUX_IP_PASSSEC:
  219                 /* needed by steam */
  220                 LINUX_RATELIMIT_MSG_OPT1(
  221                     "unsupported IPv4 socket option IP_PASSSEC (%d), you can not get IPSEC related credential information associated with this socket in linux programs -- if you do not use IPSEC, you can ignore this",
  222                     opt);
  223                 return (-2);
  224         case LINUX_IP_TRANSPARENT:
  225                 /* IP_BINDANY or more? */
  226                 LINUX_RATELIMIT_MSG_OPT1(
  227                     "unsupported IPv4 socket option IP_TRANSPARENT (%d), you can not enable transparent proxying in linux programs -- note, IP_FREEBIND is supported, no idea if the FreeBSD IP_BINDANY is equivalent to the Linux IP_TRANSPARENT or not, any info is welcome",
  228                     opt);
  229                 return (-2);
  230         case LINUX_IP_NODEFRAG:
  231                 LINUX_RATELIMIT_MSG_OPT1(
  232                     "unsupported IPv4 socket option IP_NODEFRAG (%d)",
  233                     opt);
  234                 return (-2);
  235         case LINUX_IP_CHECKSUM:
  236                 LINUX_RATELIMIT_MSG_OPT1(
  237                     "unsupported IPv4 socket option IP_CHECKSUM (%d)",
  238                     opt);
  239                 return (-2);
  240         case LINUX_IP_BIND_ADDRESS_NO_PORT:
  241                 LINUX_RATELIMIT_MSG_OPT1(
  242                     "unsupported IPv4 socket option IP_BIND_ADDRESS_NO_PORT (%d)",
  243                     opt);
  244                 return (-2);
  245         case LINUX_IP_RECVFRAGSIZE:
  246                 LINUX_RATELIMIT_MSG_OPT1(
  247                     "unsupported IPv4 socket option IP_RECVFRAGSIZE (%d)",
  248                     opt);
  249                 return (-2);
  250         case LINUX_MCAST_MSFILTER:
  251                 LINUX_RATELIMIT_MSG_OPT1(
  252                     "unsupported IPv4 socket option IP_MCAST_MSFILTER (%d)",
  253                     opt);
  254                 return (-2);
  255         case LINUX_IP_MULTICAST_ALL:
  256                 LINUX_RATELIMIT_MSG_OPT1(
  257                     "unsupported IPv4 socket option IP_MULTICAST_ALL (%d), your linux program will not see all multicast groups joined by the entire system, only those the program joined itself on this socket",
  258                     opt);
  259                 return (-2);
  260         case LINUX_IP_UNICAST_IF:
  261                 LINUX_RATELIMIT_MSG_OPT1(
  262                     "unsupported IPv4 socket option IP_UNICAST_IF (%d)",
  263                     opt);
  264                 return (-2);
  265 
  266         /* unknown sockopts */
  267         default:
  268                 return (-1);
  269         }
  270 }
  271 
  272 static int
  273 linux_to_bsd_ip6_sockopt(int opt)
  274 {
  275 
  276         switch (opt) {
  277         /* known and translated sockopts */
  278         case LINUX_IPV6_2292PKTINFO:
  279                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292PKTINFO");
  280                 return (IPV6_2292PKTINFO);
  281         case LINUX_IPV6_2292HOPOPTS:
  282                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292HOPOPTS");
  283                 return (IPV6_2292HOPOPTS);
  284         case LINUX_IPV6_2292DSTOPTS:
  285                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292DSTOPTS");
  286                 return (IPV6_2292DSTOPTS);
  287         case LINUX_IPV6_2292RTHDR:
  288                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292RTHDR");
  289                 return (IPV6_2292RTHDR);
  290         case LINUX_IPV6_2292PKTOPTIONS:
  291                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292PKTOPTIONS");
  292                 return (IPV6_2292PKTOPTIONS);
  293         case LINUX_IPV6_CHECKSUM:
  294                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_CHECKSUM");
  295                 return (IPV6_CHECKSUM);
  296         case LINUX_IPV6_2292HOPLIMIT:
  297                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_2292HOPLIMIT");
  298                 return (IPV6_2292HOPLIMIT);
  299         case LINUX_IPV6_NEXTHOP:
  300                 return (IPV6_NEXTHOP);
  301         case LINUX_IPV6_UNICAST_HOPS:
  302                 return (IPV6_UNICAST_HOPS);
  303         case LINUX_IPV6_MULTICAST_IF:
  304                 return (IPV6_MULTICAST_IF);
  305         case LINUX_IPV6_MULTICAST_HOPS:
  306                 return (IPV6_MULTICAST_HOPS);
  307         case LINUX_IPV6_MULTICAST_LOOP:
  308                 return (IPV6_MULTICAST_LOOP);
  309         case LINUX_IPV6_ADD_MEMBERSHIP:
  310                 return (IPV6_JOIN_GROUP);
  311         case LINUX_IPV6_DROP_MEMBERSHIP:
  312                 return (IPV6_LEAVE_GROUP);
  313         case LINUX_IPV6_V6ONLY:
  314                 return (IPV6_V6ONLY);
  315         case LINUX_IPV6_IPSEC_POLICY:
  316                 /* we have this option, but not documented in ip6(4) manpage */
  317                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_IPSEC_POLICY");
  318                 return (IPV6_IPSEC_POLICY);
  319         case LINUX_MCAST_JOIN_GROUP:
  320                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_JOIN_GROUP");
  321                 return (IPV6_JOIN_GROUP);
  322         case LINUX_MCAST_LEAVE_GROUP:
  323                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_LEAVE_GROUP");
  324                 return (IPV6_LEAVE_GROUP);
  325         case LINUX_IPV6_RECVPKTINFO:
  326                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVPKTINFO");
  327                 return (IPV6_RECVPKTINFO);
  328         case LINUX_IPV6_PKTINFO:
  329                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_PKTINFO");
  330                 return (IPV6_PKTINFO);
  331         case LINUX_IPV6_RECVHOPLIMIT:
  332                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVHOPLIMIT");
  333                 return (IPV6_RECVHOPLIMIT);
  334         case LINUX_IPV6_HOPLIMIT:
  335                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_HOPLIMIT");
  336                 return (IPV6_HOPLIMIT);
  337         case LINUX_IPV6_RECVHOPOPTS:
  338                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVHOPOPTS");
  339                 return (IPV6_RECVHOPOPTS);
  340         case LINUX_IPV6_HOPOPTS:
  341                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_HOPOPTS");
  342                 return (IPV6_HOPOPTS);
  343         case LINUX_IPV6_RTHDRDSTOPTS:
  344                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RTHDRDSTOPTS");
  345                 return (IPV6_RTHDRDSTOPTS);
  346         case LINUX_IPV6_RECVRTHDR:
  347                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVRTHDR");
  348                 return (IPV6_RECVRTHDR);
  349         case LINUX_IPV6_RTHDR:
  350                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RTHDR");
  351                 return (IPV6_RTHDR);
  352         case LINUX_IPV6_RECVDSTOPTS:
  353                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVDSTOPTS");
  354                 return (IPV6_RECVDSTOPTS);
  355         case LINUX_IPV6_DSTOPTS:
  356                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_DSTOPTS");
  357                 return (IPV6_DSTOPTS);
  358         case LINUX_IPV6_RECVPATHMTU:
  359                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_RECVPATHMTU");
  360                 return (IPV6_RECVPATHMTU);
  361         case LINUX_IPV6_PATHMTU:
  362                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_PATHMTU");
  363                 return (IPV6_PATHMTU);
  364         case LINUX_IPV6_DONTFRAG:
  365                 return (IPV6_DONTFRAG);
  366         case LINUX_IPV6_AUTOFLOWLABEL:
  367                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_AUTOFLOWLABEL");
  368                 return (IPV6_AUTOFLOWLABEL);
  369         case LINUX_IPV6_ORIGDSTADDR:
  370                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_ORIGDSTADDR");
  371                 return (IPV6_ORIGDSTADDR);
  372         case LINUX_IPV6_FREEBIND:
  373                 LINUX_RATELIMIT_MSG_NOTTESTED("IPv6 socket option IPV6_FREEBIND");
  374                 return (IPV6_BINDANY);
  375 
  376         /* known but not implemented sockopts */
  377         case LINUX_IPV6_ADDRFORM:
  378                 LINUX_RATELIMIT_MSG_OPT1(
  379                     "unsupported IPv6 socket option IPV6_ADDRFORM (%d), you linux program can not convert the socket to IPv4",
  380                     opt);
  381                 return (-2);
  382         case LINUX_IPV6_AUTHHDR:
  383                 LINUX_RATELIMIT_MSG_OPT1(
  384                     "unsupported IPv6 socket option IPV6_AUTHHDR (%d), your linux program can not get the authentication header info of IPv6 packets",
  385                     opt);
  386                 return (-2);
  387         case LINUX_IPV6_FLOWINFO:
  388                 LINUX_RATELIMIT_MSG_OPT1(
  389                     "unsupported IPv6 socket option IPV6_FLOWINFO (%d), your linux program can not get the flowid of IPv6 packets",
  390                     opt);
  391                 return (-2);
  392         case LINUX_IPV6_ROUTER_ALERT:
  393                 LINUX_RATELIMIT_MSG_OPT1(
  394                     "unsupported IPv6 socket option IPV6_ROUTER_ALERT (%d), you can not do user-space routing from linux programs",
  395                     opt);
  396                 return (-2);
  397         case LINUX_IPV6_MTU_DISCOVER:
  398                 LINUX_RATELIMIT_MSG_OPT1(
  399                     "unsupported IPv6 socket option IPV6_MTU_DISCOVER (%d), your linux program can not control path-MTU discovery",
  400                     opt);
  401                 return (-2);
  402         case LINUX_IPV6_MTU:
  403                 LINUX_RATELIMIT_MSG_OPT1(
  404                     "unsupported IPv6 socket option IPV6_MTU (%d), your linux program can not control the MTU on this socket",
  405                     opt);
  406                 return (-2);
  407         case LINUX_IPV6_JOIN_ANYCAST:
  408                 LINUX_RATELIMIT_MSG_OPT1(
  409                     "unsupported IPv6 socket option IPV6_JOIN_ANYCAST (%d)",
  410                     opt);
  411                 return (-2);
  412         case LINUX_IPV6_LEAVE_ANYCAST:
  413                 LINUX_RATELIMIT_MSG_OPT1(
  414                     "unsupported IPv6 socket option IPV6_LEAVE_ANYCAST (%d)",
  415                     opt);
  416                 return (-2);
  417         case LINUX_IPV6_MULTICAST_ALL:
  418                 LINUX_RATELIMIT_MSG_OPT1(
  419                     "unsupported IPv6 socket option IPV6_MULTICAST_ALL (%d)",
  420                     opt);
  421                 return (-2);
  422         case LINUX_IPV6_ROUTER_ALERT_ISOLATE:
  423                 LINUX_RATELIMIT_MSG_OPT1(
  424                     "unsupported IPv6 socket option IPV6_ROUTER_ALERT_ISOLATE (%d)",
  425                     opt);
  426                 return (-2);
  427         case LINUX_IPV6_FLOWLABEL_MGR:
  428                 LINUX_RATELIMIT_MSG_OPT1(
  429                     "unsupported IPv6 socket option IPV6_FLOWLABEL_MGR (%d)",
  430                     opt);
  431                 return (-2);
  432         case LINUX_IPV6_FLOWINFO_SEND:
  433                 LINUX_RATELIMIT_MSG_OPT1(
  434                     "unsupported IPv6 socket option IPV6_FLOWINFO_SEND (%d)",
  435                     opt);
  436                 return (-2);
  437         case LINUX_IPV6_XFRM_POLICY:
  438                 LINUX_RATELIMIT_MSG_OPT1(
  439                     "unsupported IPv6 socket option IPV6_XFRM_POLICY (%d)",
  440                     opt);
  441                 return (-2);
  442         case LINUX_IPV6_HDRINCL:
  443                 LINUX_RATELIMIT_MSG_OPT1(
  444                     "unsupported IPv6 socket option IPV6_HDRINCL (%d)",
  445                     opt);
  446                 return (-2);
  447         case LINUX_MCAST_BLOCK_SOURCE:
  448                 LINUX_RATELIMIT_MSG_OPT1(
  449                     "unsupported IPv6 socket option MCAST_BLOCK_SOURCE (%d), your linux program may see more multicast stuff than it wants",
  450                     opt);
  451                 return (-2);
  452         case LINUX_MCAST_UNBLOCK_SOURCE:
  453                 LINUX_RATELIMIT_MSG_OPT1(
  454                     "unsupported IPv6 socket option MCAST_UNBLOCK_SOURCE (%d), your linux program may not see all the multicast stuff it wants",
  455                     opt);
  456                 return (-2);
  457         case LINUX_MCAST_JOIN_SOURCE_GROUP:
  458                 LINUX_RATELIMIT_MSG_OPT1(
  459                     "unsupported IPv6 socket option MCAST_JOIN_SOURCE_GROUP (%d), your linux program is not able to join a multicast source group",
  460                     opt);
  461                 return (-2);
  462         case LINUX_MCAST_LEAVE_SOURCE_GROUP:
  463                 LINUX_RATELIMIT_MSG_OPT1(
  464                     "unsupported IPv6 socket option MCAST_LEAVE_SOURCE_GROUP (%d), your linux program is not able to leave a multicast source group -- but it was also not able to join one, so no issue",
  465                     opt);
  466                 return (-2);
  467         case LINUX_MCAST_MSFILTER:
  468                 LINUX_RATELIMIT_MSG_OPT1(
  469                     "unsupported IPv6 socket option MCAST_MSFILTER (%d), your linux program can not manipulate the multicast filter, it may see more multicast data than it wants to see",
  470                     opt);
  471                 return (-2);
  472         case LINUX_IPV6_ADDR_PREFERENCES:
  473                 LINUX_RATELIMIT_MSG_OPT1(
  474                     "unsupported IPv6 socket option IPV6_ADDR_PREFERENCES (%d)",
  475                     opt);
  476                 return (-2);
  477         case LINUX_IPV6_MINHOPCOUNT:
  478                 LINUX_RATELIMIT_MSG_OPT1(
  479                     "unsupported IPv6 socket option IPV6_MINHOPCOUNT (%d)",
  480                     opt);
  481                 return (-2);
  482         case LINUX_IPV6_TRANSPARENT:
  483                 /* IP_BINDANY or more? */
  484                 LINUX_RATELIMIT_MSG_OPT1(
  485                     "unsupported IPv6 socket option IPV6_TRANSPARENT (%d), you can not enable transparent proxying in linux programs -- note, IP_FREEBIND is supported, no idea if the FreeBSD IP_BINDANY is equivalent to the Linux IP_TRANSPARENT or not, any info is welcome",
  486                     opt);
  487                 return (-2);
  488         case LINUX_IPV6_UNICAST_IF:
  489                 LINUX_RATELIMIT_MSG_OPT1(
  490                     "unsupported IPv6 socket option IPV6_UNICAST_IF (%d)",
  491                     opt);
  492                 return (-2);
  493         case LINUX_IPV6_RECVFRAGSIZE:
  494                 LINUX_RATELIMIT_MSG_OPT1(
  495                     "unsupported IPv6 socket option IPV6_RECVFRAGSIZE (%d)",
  496                     opt);
  497                 return (-2);
  498 
  499         /* unknown sockopts */
  500         default:
  501                 return (-1);
  502         }
  503 }
  504 
  505 static int
  506 linux_to_bsd_so_sockopt(int opt)
  507 {
  508 
  509         switch (opt) {
  510         case LINUX_SO_DEBUG:
  511                 return (SO_DEBUG);
  512         case LINUX_SO_REUSEADDR:
  513                 return (SO_REUSEADDR);
  514         case LINUX_SO_TYPE:
  515                 return (SO_TYPE);
  516         case LINUX_SO_ERROR:
  517                 return (SO_ERROR);
  518         case LINUX_SO_DONTROUTE:
  519                 return (SO_DONTROUTE);
  520         case LINUX_SO_BROADCAST:
  521                 return (SO_BROADCAST);
  522         case LINUX_SO_SNDBUF:
  523         case LINUX_SO_SNDBUFFORCE:
  524                 return (SO_SNDBUF);
  525         case LINUX_SO_RCVBUF:
  526         case LINUX_SO_RCVBUFFORCE:
  527                 return (SO_RCVBUF);
  528         case LINUX_SO_KEEPALIVE:
  529                 return (SO_KEEPALIVE);
  530         case LINUX_SO_OOBINLINE:
  531                 return (SO_OOBINLINE);
  532         case LINUX_SO_LINGER:
  533                 return (SO_LINGER);
  534         case LINUX_SO_REUSEPORT:
  535                 return (SO_REUSEPORT_LB);
  536         case LINUX_SO_PASSCRED:
  537                 return (LOCAL_CREDS_PERSISTENT);
  538         case LINUX_SO_PEERCRED:
  539                 return (LOCAL_PEERCRED);
  540         case LINUX_SO_RCVLOWAT:
  541                 return (SO_RCVLOWAT);
  542         case LINUX_SO_SNDLOWAT:
  543                 return (SO_SNDLOWAT);
  544         case LINUX_SO_RCVTIMEO:
  545                 return (SO_RCVTIMEO);
  546         case LINUX_SO_SNDTIMEO:
  547                 return (SO_SNDTIMEO);
  548         case LINUX_SO_TIMESTAMP:
  549                 return (SO_TIMESTAMP);
  550         case LINUX_SO_ACCEPTCONN:
  551                 return (SO_ACCEPTCONN);
  552         case LINUX_SO_PROTOCOL:
  553                 return (SO_PROTOCOL);
  554         }
  555         return (-1);
  556 }
  557 
  558 static int
  559 linux_to_bsd_tcp_sockopt(int opt)
  560 {
  561 
  562         switch (opt) {
  563         case LINUX_TCP_NODELAY:
  564                 return (TCP_NODELAY);
  565         case LINUX_TCP_MAXSEG:
  566                 return (TCP_MAXSEG);
  567         case LINUX_TCP_CORK:
  568                 return (TCP_NOPUSH);
  569         case LINUX_TCP_KEEPIDLE:
  570                 return (TCP_KEEPIDLE);
  571         case LINUX_TCP_KEEPINTVL:
  572                 return (TCP_KEEPINTVL);
  573         case LINUX_TCP_KEEPCNT:
  574                 return (TCP_KEEPCNT);
  575         case LINUX_TCP_MD5SIG:
  576                 return (TCP_MD5SIG);
  577         }
  578         return (-1);
  579 }
  580 
  581 static int
  582 linux_to_bsd_msg_flags(int flags)
  583 {
  584         int ret_flags = 0;
  585 
  586         if (flags & LINUX_MSG_OOB)
  587                 ret_flags |= MSG_OOB;
  588         if (flags & LINUX_MSG_PEEK)
  589                 ret_flags |= MSG_PEEK;
  590         if (flags & LINUX_MSG_DONTROUTE)
  591                 ret_flags |= MSG_DONTROUTE;
  592         if (flags & LINUX_MSG_CTRUNC)
  593                 ret_flags |= MSG_CTRUNC;
  594         if (flags & LINUX_MSG_TRUNC)
  595                 ret_flags |= MSG_TRUNC;
  596         if (flags & LINUX_MSG_DONTWAIT)
  597                 ret_flags |= MSG_DONTWAIT;
  598         if (flags & LINUX_MSG_EOR)
  599                 ret_flags |= MSG_EOR;
  600         if (flags & LINUX_MSG_WAITALL)
  601                 ret_flags |= MSG_WAITALL;
  602         if (flags & LINUX_MSG_NOSIGNAL)
  603                 ret_flags |= MSG_NOSIGNAL;
  604         if (flags & LINUX_MSG_PROXY)
  605                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_PROXY (%d) not handled",
  606                     LINUX_MSG_PROXY);
  607         if (flags & LINUX_MSG_FIN)
  608                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_FIN (%d) not handled",
  609                     LINUX_MSG_FIN);
  610         if (flags & LINUX_MSG_SYN)
  611                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_SYN (%d) not handled",
  612                     LINUX_MSG_SYN);
  613         if (flags & LINUX_MSG_CONFIRM)
  614                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_CONFIRM (%d) not handled",
  615                     LINUX_MSG_CONFIRM);
  616         if (flags & LINUX_MSG_RST)
  617                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_RST (%d) not handled",
  618                     LINUX_MSG_RST);
  619         if (flags & LINUX_MSG_ERRQUEUE)
  620                 LINUX_RATELIMIT_MSG_OPT1("socket message flag MSG_ERRQUEUE (%d) not handled",
  621                     LINUX_MSG_ERRQUEUE);
  622         return (ret_flags);
  623 }
  624 
  625 static int
  626 linux_to_bsd_cmsg_type(int cmsg_type)
  627 {
  628 
  629         switch (cmsg_type) {
  630         case LINUX_SCM_RIGHTS:
  631                 return (SCM_RIGHTS);
  632         case LINUX_SCM_CREDENTIALS:
  633                 return (SCM_CREDS);
  634         }
  635         return (-1);
  636 }
  637 
  638 static int
  639 bsd_to_linux_cmsg_type(int cmsg_type)
  640 {
  641 
  642         switch (cmsg_type) {
  643         case SCM_RIGHTS:
  644                 return (LINUX_SCM_RIGHTS);
  645         case SCM_CREDS:
  646                 return (LINUX_SCM_CREDENTIALS);
  647         case SCM_CREDS2:
  648                 return (LINUX_SCM_CREDENTIALS);
  649         case SCM_TIMESTAMP:
  650                 return (LINUX_SCM_TIMESTAMP);
  651         }
  652         return (-1);
  653 }
  654 
  655 static int
  656 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr)
  657 {
  658         if (lhdr->msg_controllen > INT_MAX)
  659                 return (ENOBUFS);
  660 
  661         bhdr->msg_name          = PTRIN(lhdr->msg_name);
  662         bhdr->msg_namelen       = lhdr->msg_namelen;
  663         bhdr->msg_iov           = PTRIN(lhdr->msg_iov);
  664         bhdr->msg_iovlen        = lhdr->msg_iovlen;
  665         bhdr->msg_control       = PTRIN(lhdr->msg_control);
  666 
  667         /*
  668          * msg_controllen is skipped since BSD and LINUX control messages
  669          * are potentially different sizes (e.g. the cred structure used
  670          * by SCM_CREDS is different between the two operating system).
  671          *
  672          * The caller can set it (if necessary) after converting all the
  673          * control messages.
  674          */
  675 
  676         bhdr->msg_flags         = linux_to_bsd_msg_flags(lhdr->msg_flags);
  677         return (0);
  678 }
  679 
  680 static int
  681 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr)
  682 {
  683         lhdr->msg_name          = PTROUT(bhdr->msg_name);
  684         lhdr->msg_namelen       = bhdr->msg_namelen;
  685         lhdr->msg_iov           = PTROUT(bhdr->msg_iov);
  686         lhdr->msg_iovlen        = bhdr->msg_iovlen;
  687         lhdr->msg_control       = PTROUT(bhdr->msg_control);
  688 
  689         /*
  690          * msg_controllen is skipped since BSD and LINUX control messages
  691          * are potentially different sizes (e.g. the cred structure used
  692          * by SCM_CREDS is different between the two operating system).
  693          *
  694          * The caller can set it (if necessary) after converting all the
  695          * control messages.
  696          */
  697 
  698         /* msg_flags skipped */
  699         return (0);
  700 }
  701 
  702 static int
  703 linux_set_socket_flags(int lflags, int *flags)
  704 {
  705 
  706         if (lflags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK))
  707                 return (EINVAL);
  708         if (lflags & LINUX_SOCK_NONBLOCK)
  709                 *flags |= SOCK_NONBLOCK;
  710         if (lflags & LINUX_SOCK_CLOEXEC)
  711                 *flags |= SOCK_CLOEXEC;
  712         return (0);
  713 }
  714 
  715 static int
  716 linux_copyout_sockaddr(const struct sockaddr *sa, void *uaddr, size_t len)
  717 {
  718         struct l_sockaddr *lsa;
  719         int error;
  720 
  721         error = bsd_to_linux_sockaddr(sa, &lsa, len);
  722         if (error != 0)
  723                 return (error);
  724         
  725         error = copyout(lsa, uaddr, len);
  726         free(lsa, M_SONAME);
  727 
  728         return (error);
  729 }
  730 
  731 static int
  732 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags,
  733     struct mbuf *control, enum uio_seg segflg)
  734 {
  735         struct sockaddr *to;
  736         int error, len;
  737 
  738         if (mp->msg_name != NULL) {
  739                 len = mp->msg_namelen;
  740                 error = linux_to_bsd_sockaddr(mp->msg_name, &to, &len);
  741                 if (error != 0)
  742                         return (error);
  743                 mp->msg_name = to;
  744         } else
  745                 to = NULL;
  746 
  747         error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control,
  748             segflg);
  749 
  750         if (to)
  751                 free(to, M_SONAME);
  752         return (error);
  753 }
  754 
  755 /* Return 0 if IP_HDRINCL is set for the given socket. */
  756 static int
  757 linux_check_hdrincl(struct thread *td, int s)
  758 {
  759         int error, optval;
  760         socklen_t size_val;
  761 
  762         size_val = sizeof(optval);
  763         error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL,
  764             &optval, UIO_SYSSPACE, &size_val);
  765         if (error != 0)
  766                 return (error);
  767 
  768         return (optval == 0);
  769 }
  770 
  771 /*
  772  * Updated sendto() when IP_HDRINCL is set:
  773  * tweak endian-dependent fields in the IP packet.
  774  */
  775 static int
  776 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args)
  777 {
  778 /*
  779  * linux_ip_copysize defines how many bytes we should copy
  780  * from the beginning of the IP packet before we customize it for BSD.
  781  * It should include all the fields we modify (ip_len and ip_off).
  782  */
  783 #define linux_ip_copysize       8
  784 
  785         struct ip *packet;
  786         struct msghdr msg;
  787         struct iovec aiov[1];
  788         int error;
  789 
  790         /* Check that the packet isn't too big or too small. */
  791         if (linux_args->len < linux_ip_copysize ||
  792             linux_args->len > IP_MAXPACKET)
  793                 return (EINVAL);
  794 
  795         packet = (struct ip *)malloc(linux_args->len, M_LINUX, M_WAITOK);
  796 
  797         /* Make kernel copy of the packet to be sent */
  798         if ((error = copyin(PTRIN(linux_args->msg), packet,
  799             linux_args->len)))
  800                 goto goout;
  801 
  802         /* Convert fields from Linux to BSD raw IP socket format */
  803         packet->ip_len = linux_args->len;
  804         packet->ip_off = ntohs(packet->ip_off);
  805 
  806         /* Prepare the msghdr and iovec structures describing the new packet */
  807         msg.msg_name = PTRIN(linux_args->to);
  808         msg.msg_namelen = linux_args->tolen;
  809         msg.msg_iov = aiov;
  810         msg.msg_iovlen = 1;
  811         msg.msg_control = NULL;
  812         msg.msg_flags = 0;
  813         aiov[0].iov_base = (char *)packet;
  814         aiov[0].iov_len = linux_args->len;
  815         error = linux_sendit(td, linux_args->s, &msg, linux_args->flags,
  816             NULL, UIO_SYSSPACE);
  817 goout:
  818         free(packet, M_LINUX);
  819         return (error);
  820 }
  821 
  822 static const char *linux_netlink_names[] = {
  823         [LINUX_NETLINK_ROUTE] = "ROUTE",
  824         [LINUX_NETLINK_SOCK_DIAG] = "SOCK_DIAG",
  825         [LINUX_NETLINK_NFLOG] = "NFLOG",
  826         [LINUX_NETLINK_SELINUX] = "SELINUX",
  827         [LINUX_NETLINK_AUDIT] = "AUDIT",
  828         [LINUX_NETLINK_FIB_LOOKUP] = "FIB_LOOKUP",
  829         [LINUX_NETLINK_NETFILTER] = "NETFILTER",
  830         [LINUX_NETLINK_KOBJECT_UEVENT] = "KOBJECT_UEVENT",
  831 };
  832 
  833 int
  834 linux_socket(struct thread *td, struct linux_socket_args *args)
  835 {
  836         int domain, retval_socket, type;
  837 
  838         type = args->type & LINUX_SOCK_TYPE_MASK;
  839         if (type < 0 || type > LINUX_SOCK_MAX)
  840                 return (EINVAL);
  841         retval_socket = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
  842                 &type);
  843         if (retval_socket != 0)
  844                 return (retval_socket);
  845         domain = linux_to_bsd_domain(args->domain);
  846         if (domain == -1) {
  847                 /* Mask off SOCK_NONBLOCK / CLOEXEC for error messages. */
  848                 type = args->type & LINUX_SOCK_TYPE_MASK;
  849                 if (args->domain == LINUX_AF_NETLINK &&
  850                     args->protocol == LINUX_NETLINK_AUDIT) {
  851                         ; /* Do nothing, quietly. */
  852                 } else if (args->domain == LINUX_AF_NETLINK) {
  853                         const char *nl_name;
  854 
  855                         if (args->protocol >= 0 &&
  856                             args->protocol < nitems(linux_netlink_names))
  857                                 nl_name = linux_netlink_names[args->protocol];
  858                         else
  859                                 nl_name = NULL;
  860                         if (nl_name != NULL)
  861                                 linux_msg(curthread,
  862                                     "unsupported socket(AF_NETLINK, %d, "
  863                                     "NETLINK_%s)", type, nl_name);
  864                         else
  865                                 linux_msg(curthread,
  866                                     "unsupported socket(AF_NETLINK, %d, %d)",
  867                                     type, args->protocol);
  868                 } else {
  869                         linux_msg(curthread, "unsupported socket domain %d, "
  870                             "type %d, protocol %d", args->domain, type,
  871                             args->protocol);
  872                 }
  873                 return (EAFNOSUPPORT);
  874         }
  875 
  876         retval_socket = kern_socket(td, domain, type, args->protocol);
  877         if (retval_socket)
  878                 return (retval_socket);
  879 
  880         if (type == SOCK_RAW
  881             && (args->protocol == IPPROTO_RAW || args->protocol == 0)
  882             && domain == PF_INET) {
  883                 /* It's a raw IP socket: set the IP_HDRINCL option. */
  884                 int hdrincl;
  885 
  886                 hdrincl = 1;
  887                 /* We ignore any error returned by kern_setsockopt() */
  888                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL,
  889                     &hdrincl, UIO_SYSSPACE, sizeof(hdrincl));
  890         }
  891 #ifdef INET6
  892         /*
  893          * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default
  894          * and some apps depend on this. So, set V6ONLY to 0 for Linux apps.
  895          * For simplicity we do this unconditionally of the net.inet6.ip6.v6only
  896          * sysctl value.
  897          */
  898         if (domain == PF_INET6) {
  899                 int v6only;
  900 
  901                 v6only = 0;
  902                 /* We ignore any error returned by setsockopt() */
  903                 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY,
  904                     &v6only, UIO_SYSSPACE, sizeof(v6only));
  905         }
  906 #endif
  907 
  908         return (retval_socket);
  909 }
  910 
  911 int
  912 linux_bind(struct thread *td, struct linux_bind_args *args)
  913 {
  914         struct sockaddr *sa;
  915         int error;
  916 
  917         error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa,
  918             &args->namelen);
  919         if (error != 0)
  920                 return (error);
  921 
  922         error = kern_bindat(td, AT_FDCWD, args->s, sa);
  923         free(sa, M_SONAME);
  924 
  925         /* XXX */
  926         if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
  927                 return (EINVAL);
  928         return (error);
  929 }
  930 
  931 int
  932 linux_connect(struct thread *td, struct linux_connect_args *args)
  933 {
  934         struct socket *so;
  935         struct sockaddr *sa;
  936         struct file *fp;
  937         u_int fflag;
  938         int error;
  939 
  940         error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa,
  941             &args->namelen);
  942         if (error != 0)
  943                 return (error);
  944 
  945         error = kern_connectat(td, AT_FDCWD, args->s, sa);
  946         free(sa, M_SONAME);
  947         if (error != EISCONN)
  948                 return (error);
  949 
  950         /*
  951          * Linux doesn't return EISCONN the first time it occurs,
  952          * when on a non-blocking socket. Instead it returns the
  953          * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD.
  954          */
  955         error = getsock_cap(td, args->s, &cap_connect_rights,
  956             &fp, &fflag, NULL);
  957         if (error != 0)
  958                 return (error);
  959 
  960         error = EISCONN;
  961         so = fp->f_data;
  962         if (fflag & FNONBLOCK) {
  963                 SOCK_LOCK(so);
  964                 if (so->so_emuldata == 0)
  965                         error = so->so_error;
  966                 so->so_emuldata = (void *)1;
  967                 SOCK_UNLOCK(so);
  968         }
  969         fdrop(fp, td);
  970 
  971         return (error);
  972 }
  973 
  974 int
  975 linux_listen(struct thread *td, struct linux_listen_args *args)
  976 {
  977 
  978         return (kern_listen(td, args->s, args->backlog));
  979 }
  980 
  981 static int
  982 linux_accept_common(struct thread *td, int s, l_uintptr_t addr,
  983     l_uintptr_t namelen, int flags)
  984 {
  985         struct sockaddr *sa;
  986         struct file *fp, *fp1;
  987         int bflags, len;
  988         struct socket *so;
  989         int error, error1;
  990 
  991         bflags = 0;
  992         fp = NULL;
  993         sa = NULL;
  994 
  995         error = linux_set_socket_flags(flags, &bflags);
  996         if (error != 0)
  997                 return (error);
  998 
  999         if (PTRIN(addr) == NULL) {
 1000                 len = 0;
 1001                 error = kern_accept4(td, s, NULL, NULL, bflags, NULL);
 1002         } else {
 1003                 error = copyin(PTRIN(namelen), &len, sizeof(len));
 1004                 if (error != 0)
 1005                         return (error);
 1006                 if (len < 0)
 1007                         return (EINVAL);
 1008                 error = kern_accept4(td, s, &sa, &len, bflags, &fp);
 1009         }
 1010 
 1011         /*
 1012          * Translate errno values into ones used by Linux.
 1013          */
 1014         if (error != 0) {
 1015                 /*
 1016                  * XXX. This is wrong, different sockaddr structures
 1017                  * have different sizes.
 1018                  */
 1019                 switch (error) {
 1020                 case EFAULT:
 1021                         if (namelen != sizeof(struct sockaddr_in))
 1022                                 error = EINVAL;
 1023                         break;
 1024                 case EINVAL:
 1025                         error1 = getsock_cap(td, s, &cap_accept_rights, &fp1, NULL, NULL);
 1026                         if (error1 != 0) {
 1027                                 error = error1;
 1028                                 break;
 1029                         }
 1030                         so = fp1->f_data;
 1031                         if (so->so_type == SOCK_DGRAM)
 1032                                 error = EOPNOTSUPP;
 1033                         fdrop(fp1, td);
 1034                         break;
 1035                 }
 1036                 return (error);
 1037         }
 1038 
 1039         if (len != 0) {
 1040                 error = linux_copyout_sockaddr(sa, PTRIN(addr), len);
 1041 
 1042                 /*
 1043                  * XXX: We should also copyout the len, shouldn't we?
 1044                  */
 1045 
 1046                 if (error != 0) {
 1047                         fdclose(td, fp, td->td_retval[0]);
 1048                         td->td_retval[0] = 0;
 1049                 }
 1050         }
 1051         if (fp != NULL)
 1052                 fdrop(fp, td);
 1053         free(sa, M_SONAME);
 1054         return (error);
 1055 }
 1056 
 1057 int
 1058 linux_accept(struct thread *td, struct linux_accept_args *args)
 1059 {
 1060 
 1061         return (linux_accept_common(td, args->s, args->addr,
 1062             args->namelen, 0));
 1063 }
 1064 
 1065 int
 1066 linux_accept4(struct thread *td, struct linux_accept4_args *args)
 1067 {
 1068 
 1069         return (linux_accept_common(td, args->s, args->addr,
 1070             args->namelen, args->flags));
 1071 }
 1072 
 1073 int
 1074 linux_getsockname(struct thread *td, struct linux_getsockname_args *args)
 1075 {
 1076         struct sockaddr *sa;
 1077         int len, error;
 1078 
 1079         error = copyin(PTRIN(args->namelen), &len, sizeof(len));
 1080         if (error != 0)
 1081                 return (error);
 1082 
 1083         error = kern_getsockname(td, args->s, &sa, &len);
 1084         if (error != 0)
 1085                 return (error);
 1086 
 1087         if (len != 0)
 1088                 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len);
 1089 
 1090         free(sa, M_SONAME);
 1091         if (error == 0)
 1092                 error = copyout(&len, PTRIN(args->namelen), sizeof(len));
 1093         return (error);
 1094 }
 1095 
 1096 int
 1097 linux_getpeername(struct thread *td, struct linux_getpeername_args *args)
 1098 {
 1099         struct sockaddr *sa;
 1100         int len, error;
 1101 
 1102         error = copyin(PTRIN(args->namelen), &len, sizeof(len));
 1103         if (error != 0)
 1104                 return (error);
 1105         if (len < 0)
 1106                 return (EINVAL);
 1107 
 1108         error = kern_getpeername(td, args->s, &sa, &len);
 1109         if (error != 0)
 1110                 return (error);
 1111 
 1112         if (len != 0)
 1113                 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len);
 1114 
 1115         free(sa, M_SONAME);
 1116         if (error == 0)
 1117                 error = copyout(&len, PTRIN(args->namelen), sizeof(len));
 1118         return (error);
 1119 }
 1120 
 1121 int
 1122 linux_socketpair(struct thread *td, struct linux_socketpair_args *args)
 1123 {
 1124         int domain, error, sv[2], type;
 1125 
 1126         domain = linux_to_bsd_domain(args->domain);
 1127         if (domain != PF_LOCAL)
 1128                 return (EAFNOSUPPORT);
 1129         type = args->type & LINUX_SOCK_TYPE_MASK;
 1130         if (type < 0 || type > LINUX_SOCK_MAX)
 1131                 return (EINVAL);
 1132         error = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK,
 1133             &type);
 1134         if (error != 0)
 1135                 return (error);
 1136         if (args->protocol != 0 && args->protocol != PF_UNIX) {
 1137                 /*
 1138                  * Use of PF_UNIX as protocol argument is not right,
 1139                  * but Linux does it.
 1140                  * Do not map PF_UNIX as its Linux value is identical
 1141                  * to FreeBSD one.
 1142                  */
 1143                 return (EPROTONOSUPPORT);
 1144         }
 1145         error = kern_socketpair(td, domain, type, 0, sv);
 1146         if (error != 0)
 1147                 return (error);
 1148         error = copyout(sv, PTRIN(args->rsv), 2 * sizeof(int));
 1149         if (error != 0) {
 1150                 (void)kern_close(td, sv[0]);
 1151                 (void)kern_close(td, sv[1]);
 1152         }
 1153         return (error);
 1154 }
 1155 
 1156 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1157 struct linux_send_args {
 1158         register_t s;
 1159         register_t msg;
 1160         register_t len;
 1161         register_t flags;
 1162 };
 1163 
 1164 static int
 1165 linux_send(struct thread *td, struct linux_send_args *args)
 1166 {
 1167         struct sendto_args /* {
 1168                 int s;
 1169                 caddr_t buf;
 1170                 int len;
 1171                 int flags;
 1172                 caddr_t to;
 1173                 int tolen;
 1174         } */ bsd_args;
 1175         struct file *fp;
 1176         int error, fflag;
 1177 
 1178         bsd_args.s = args->s;
 1179         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1180         bsd_args.len = args->len;
 1181         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1182         bsd_args.to = NULL;
 1183         bsd_args.tolen = 0;
 1184         error = sys_sendto(td, &bsd_args);
 1185         if (error == ENOTCONN) {
 1186                 /*
 1187                  * Linux doesn't return ENOTCONN for non-blocking sockets.
 1188                  * Instead it returns the EAGAIN.
 1189                  */
 1190                 error = getsock_cap(td, args->s, &cap_send_rights, &fp,
 1191                     &fflag, NULL);
 1192                 if (error == 0) {
 1193                         if (fflag & FNONBLOCK)
 1194                                 error = EAGAIN;
 1195                         fdrop(fp, td);
 1196                 }
 1197         }
 1198         return (error);
 1199 }
 1200 
 1201 struct linux_recv_args {
 1202         register_t s;
 1203         register_t msg;
 1204         register_t len;
 1205         register_t flags;
 1206 };
 1207 
 1208 static int
 1209 linux_recv(struct thread *td, struct linux_recv_args *args)
 1210 {
 1211         struct recvfrom_args /* {
 1212                 int s;
 1213                 caddr_t buf;
 1214                 int len;
 1215                 int flags;
 1216                 struct sockaddr *from;
 1217                 socklen_t fromlenaddr;
 1218         } */ bsd_args;
 1219 
 1220         bsd_args.s = args->s;
 1221         bsd_args.buf = (caddr_t)PTRIN(args->msg);
 1222         bsd_args.len = args->len;
 1223         bsd_args.flags = linux_to_bsd_msg_flags(args->flags);
 1224         bsd_args.from = NULL;
 1225         bsd_args.fromlenaddr = 0;
 1226         return (sys_recvfrom(td, &bsd_args));
 1227 }
 1228 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1229 
 1230 int
 1231 linux_sendto(struct thread *td, struct linux_sendto_args *args)
 1232 {
 1233         struct msghdr msg;
 1234         struct iovec aiov;
 1235 
 1236         if (linux_check_hdrincl(td, args->s) == 0)
 1237                 /* IP_HDRINCL set, tweak the packet before sending */
 1238                 return (linux_sendto_hdrincl(td, args));
 1239 
 1240         msg.msg_name = PTRIN(args->to);
 1241         msg.msg_namelen = args->tolen;
 1242         msg.msg_iov = &aiov;
 1243         msg.msg_iovlen = 1;
 1244         msg.msg_control = NULL;
 1245         msg.msg_flags = 0;
 1246         aiov.iov_base = PTRIN(args->msg);
 1247         aiov.iov_len = args->len;
 1248         return (linux_sendit(td, args->s, &msg, args->flags, NULL,
 1249             UIO_USERSPACE));
 1250 }
 1251 
 1252 int
 1253 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args)
 1254 {
 1255         struct sockaddr *sa;
 1256         struct msghdr msg;
 1257         struct iovec aiov;
 1258         int error, fromlen;
 1259 
 1260         if (PTRIN(args->fromlen) != NULL) {
 1261                 error = copyin(PTRIN(args->fromlen), &fromlen,
 1262                     sizeof(fromlen));
 1263                 if (error != 0)
 1264                         return (error);
 1265                 if (fromlen < 0)
 1266                         return (EINVAL);
 1267                 sa = malloc(fromlen, M_SONAME, M_WAITOK);
 1268         } else {
 1269                 fromlen = 0;
 1270                 sa = NULL;
 1271         }
 1272 
 1273         msg.msg_name = sa;
 1274         msg.msg_namelen = fromlen;
 1275         msg.msg_iov = &aiov;
 1276         msg.msg_iovlen = 1;
 1277         aiov.iov_base = PTRIN(args->buf);
 1278         aiov.iov_len = args->len;
 1279         msg.msg_control = 0;
 1280         msg.msg_flags = linux_to_bsd_msg_flags(args->flags);
 1281 
 1282         error = kern_recvit(td, args->s, &msg, UIO_SYSSPACE, NULL);
 1283         if (error != 0)
 1284                 goto out;
 1285 
 1286         if (PTRIN(args->from) != NULL)
 1287                 error = linux_copyout_sockaddr(sa, PTRIN(args->from), msg.msg_namelen);
 1288 
 1289         if (error == 0 && PTRIN(args->fromlen) != NULL)
 1290                 error = copyout(&msg.msg_namelen, PTRIN(args->fromlen),
 1291                     sizeof(msg.msg_namelen));
 1292 out:
 1293         free(sa, M_SONAME);
 1294         return (error);
 1295 }
 1296 
 1297 static int
 1298 linux_sendmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
 1299     l_uint flags)
 1300 {
 1301         struct cmsghdr *cmsg;
 1302         struct mbuf *control;
 1303         struct msghdr msg;
 1304         struct l_cmsghdr linux_cmsg;
 1305         struct l_cmsghdr *ptr_cmsg;
 1306         struct l_msghdr linux_msghdr;
 1307         struct iovec *iov;
 1308         socklen_t datalen;
 1309         struct sockaddr *sa;
 1310         struct socket *so;
 1311         sa_family_t sa_family;
 1312         struct file *fp;
 1313         void *data;
 1314         l_size_t len;
 1315         l_size_t clen;
 1316         int error, fflag;
 1317 
 1318         error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr));
 1319         if (error != 0)
 1320                 return (error);
 1321 
 1322         /*
 1323          * Some Linux applications (ping) define a non-NULL control data
 1324          * pointer, but a msg_controllen of 0, which is not allowed in the
 1325          * FreeBSD system call interface.  NULL the msg_control pointer in
 1326          * order to handle this case.  This should be checked, but allows the
 1327          * Linux ping to work.
 1328          */
 1329         if (PTRIN(linux_msghdr.msg_control) != NULL &&
 1330             linux_msghdr.msg_controllen == 0)
 1331                 linux_msghdr.msg_control = PTROUT(NULL);
 1332 
 1333         error = linux_to_bsd_msghdr(&msg, &linux_msghdr);
 1334         if (error != 0)
 1335                 return (error);
 1336 
 1337 #ifdef COMPAT_LINUX32
 1338         error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen,
 1339             &iov, EMSGSIZE);
 1340 #else
 1341         error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE);
 1342 #endif
 1343         if (error != 0)
 1344                 return (error);
 1345 
 1346         control = NULL;
 1347 
 1348         error = kern_getsockname(td, s, &sa, &datalen);
 1349         if (error != 0)
 1350                 goto bad;
 1351         sa_family = sa->sa_family;
 1352         free(sa, M_SONAME);
 1353 
 1354         if (flags & LINUX_MSG_OOB) {
 1355                 error = EOPNOTSUPP;
 1356                 if (sa_family == AF_UNIX)
 1357                         goto bad;
 1358 
 1359                 error = getsock_cap(td, s, &cap_send_rights, &fp,
 1360                     &fflag, NULL);
 1361                 if (error != 0)
 1362                         goto bad;
 1363                 so = fp->f_data;
 1364                 if (so->so_type != SOCK_STREAM)
 1365                         error = EOPNOTSUPP;
 1366                 fdrop(fp, td);
 1367                 if (error != 0)
 1368                         goto bad;
 1369         }
 1370 
 1371         if (linux_msghdr.msg_controllen >= sizeof(struct l_cmsghdr)) {
 1372                 error = ENOBUFS;
 1373                 control = m_get(M_WAITOK, MT_CONTROL);
 1374                 MCLGET(control, M_WAITOK);
 1375                 data = mtod(control, void *);
 1376                 datalen = 0;
 1377 
 1378                 ptr_cmsg = PTRIN(linux_msghdr.msg_control);
 1379                 clen = linux_msghdr.msg_controllen;
 1380                 do {
 1381                         error = copyin(ptr_cmsg, &linux_cmsg,
 1382                             sizeof(struct l_cmsghdr));
 1383                         if (error != 0)
 1384                                 goto bad;
 1385 
 1386                         error = EINVAL;
 1387                         if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr) ||
 1388                             linux_cmsg.cmsg_len > clen)
 1389                                 goto bad;
 1390 
 1391                         if (datalen + CMSG_HDRSZ > MCLBYTES)
 1392                                 goto bad;
 1393 
 1394                         /*
 1395                          * Now we support only SCM_RIGHTS and SCM_CRED,
 1396                          * so return EINVAL in any other cmsg_type
 1397                          */
 1398                         cmsg = data;
 1399                         cmsg->cmsg_type =
 1400                             linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type);
 1401                         cmsg->cmsg_level =
 1402                             linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level);
 1403                         if (cmsg->cmsg_type == -1
 1404                             || cmsg->cmsg_level != SOL_SOCKET) {
 1405                                 linux_msg(curthread,
 1406                                     "unsupported sendmsg cmsg level %d type %d",
 1407                                     linux_cmsg.cmsg_level, linux_cmsg.cmsg_type);
 1408                                 goto bad;
 1409                         }
 1410 
 1411                         /*
 1412                          * Some applications (e.g. pulseaudio) attempt to
 1413                          * send ancillary data even if the underlying protocol
 1414                          * doesn't support it which is not allowed in the
 1415                          * FreeBSD system call interface.
 1416                          */
 1417                         if (sa_family != AF_UNIX)
 1418                                 goto next;
 1419 
 1420                         if (cmsg->cmsg_type == SCM_CREDS) {
 1421                                 len = sizeof(struct cmsgcred);
 1422                                 if (datalen + CMSG_SPACE(len) > MCLBYTES)
 1423                                         goto bad;
 1424 
 1425                                 /*
 1426                                  * The lower levels will fill in the structure
 1427                                  */
 1428                                 memset(CMSG_DATA(data), 0, len);
 1429                         } else {
 1430                                 len = linux_cmsg.cmsg_len - L_CMSG_HDRSZ;
 1431                                 if (datalen + CMSG_SPACE(len) < datalen ||
 1432                                     datalen + CMSG_SPACE(len) > MCLBYTES)
 1433                                         goto bad;
 1434 
 1435                                 error = copyin(LINUX_CMSG_DATA(ptr_cmsg),
 1436                                     CMSG_DATA(data), len);
 1437                                 if (error != 0)
 1438                                         goto bad;
 1439                         }
 1440 
 1441                         cmsg->cmsg_len = CMSG_LEN(len);
 1442                         data = (char *)data + CMSG_SPACE(len);
 1443                         datalen += CMSG_SPACE(len);
 1444 
 1445 next:
 1446                         if (clen <= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len))
 1447                                 break;
 1448 
 1449                         clen -= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len);
 1450                         ptr_cmsg = (struct l_cmsghdr *)((char *)ptr_cmsg +
 1451                             LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len));
 1452                 } while(clen >= sizeof(struct l_cmsghdr));
 1453 
 1454                 control->m_len = datalen;
 1455                 if (datalen == 0) {
 1456                         m_freem(control);
 1457                         control = NULL;
 1458                 }
 1459         }
 1460 
 1461         msg.msg_iov = iov;
 1462         msg.msg_flags = 0;
 1463         error = linux_sendit(td, s, &msg, flags, control, UIO_USERSPACE);
 1464         control = NULL;
 1465 
 1466 bad:
 1467         m_freem(control);
 1468         free(iov, M_IOV);
 1469         return (error);
 1470 }
 1471 
 1472 int
 1473 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args)
 1474 {
 1475 
 1476         return (linux_sendmsg_common(td, args->s, PTRIN(args->msg),
 1477             args->flags));
 1478 }
 1479 
 1480 int
 1481 linux_sendmmsg(struct thread *td, struct linux_sendmmsg_args *args)
 1482 {
 1483         struct l_mmsghdr *msg;
 1484         l_uint retval;
 1485         int error, datagrams;
 1486 
 1487         if (args->vlen > UIO_MAXIOV)
 1488                 args->vlen = UIO_MAXIOV;
 1489 
 1490         msg = PTRIN(args->msg);
 1491         datagrams = 0;
 1492         while (datagrams < args->vlen) {
 1493                 error = linux_sendmsg_common(td, args->s, &msg->msg_hdr,
 1494                     args->flags);
 1495                 if (error != 0)
 1496                         break;
 1497 
 1498                 retval = td->td_retval[0];
 1499                 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
 1500                 if (error != 0)
 1501                         break;
 1502                 ++msg;
 1503                 ++datagrams;
 1504         }
 1505         if (error == 0)
 1506                 td->td_retval[0] = datagrams;
 1507         return (error);
 1508 }
 1509 
 1510 static int
 1511 linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr,
 1512     l_uint flags, struct msghdr *msg)
 1513 {
 1514         struct cmsghdr *cm;
 1515         struct cmsgcred *cmcred;
 1516         struct sockcred2 *scred;
 1517         struct l_cmsghdr *linux_cmsg = NULL;
 1518         struct l_ucred linux_ucred;
 1519         socklen_t datalen, maxlen, outlen;
 1520         struct l_msghdr linux_msghdr;
 1521         struct iovec *iov, *uiov;
 1522         struct mbuf *control = NULL;
 1523         struct mbuf **controlp;
 1524         struct timeval *ftmvl;
 1525         struct sockaddr *sa;
 1526         l_timeval ltmvl;
 1527         caddr_t outbuf;
 1528         void *data;
 1529         int error, i, fd, fds, *fdp;
 1530 
 1531         error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr));
 1532         if (error != 0)
 1533                 return (error);
 1534 
 1535         error = linux_to_bsd_msghdr(msg, &linux_msghdr);
 1536         if (error != 0)
 1537                 return (error);
 1538 
 1539 #ifdef COMPAT_LINUX32
 1540         error = linux32_copyiniov(PTRIN(msg->msg_iov), msg->msg_iovlen,
 1541             &iov, EMSGSIZE);
 1542 #else
 1543         error = copyiniov(msg->msg_iov, msg->msg_iovlen, &iov, EMSGSIZE);
 1544 #endif
 1545         if (error != 0)
 1546                 return (error);
 1547 
 1548         if (msg->msg_name != NULL && msg->msg_namelen > 0) {
 1549                 msg->msg_namelen = min(msg->msg_namelen, SOCK_MAXADDRLEN);
 1550                 sa = malloc(msg->msg_namelen, M_SONAME, M_WAITOK);
 1551                 msg->msg_name = sa;
 1552         } else {
 1553                 sa = NULL;
 1554                 msg->msg_name = NULL;
 1555         }
 1556 
 1557         uiov = msg->msg_iov;
 1558         msg->msg_iov = iov;
 1559         controlp = (msg->msg_control != NULL) ? &control : NULL;
 1560         error = kern_recvit(td, s, msg, UIO_SYSSPACE, controlp);
 1561         msg->msg_iov = uiov;
 1562         if (error != 0)
 1563                 goto bad;
 1564 
 1565         /*
 1566          * Note that kern_recvit() updates msg->msg_namelen.
 1567          */
 1568         if (msg->msg_name != NULL && msg->msg_namelen > 0) {
 1569                 msg->msg_name = PTRIN(linux_msghdr.msg_name);
 1570                 error = linux_copyout_sockaddr(sa,
 1571                     PTRIN(msg->msg_name), msg->msg_namelen);
 1572                 if (error != 0)
 1573                         goto bad;
 1574         }
 1575 
 1576         error = bsd_to_linux_msghdr(msg, &linux_msghdr);
 1577         if (error != 0)
 1578                 goto bad;
 1579 
 1580         maxlen = linux_msghdr.msg_controllen;
 1581         linux_msghdr.msg_controllen = 0;
 1582         if (control) {
 1583                 linux_cmsg = malloc(L_CMSG_HDRSZ, M_LINUX, M_WAITOK | M_ZERO);
 1584 
 1585                 msg->msg_control = mtod(control, struct cmsghdr *);
 1586                 msg->msg_controllen = control->m_len;
 1587 
 1588                 cm = CMSG_FIRSTHDR(msg);
 1589                 outbuf = PTRIN(linux_msghdr.msg_control);
 1590                 outlen = 0;
 1591                 while (cm != NULL) {
 1592                         linux_cmsg->cmsg_type =
 1593                             bsd_to_linux_cmsg_type(cm->cmsg_type);
 1594                         linux_cmsg->cmsg_level =
 1595                             bsd_to_linux_sockopt_level(cm->cmsg_level);
 1596                         if (linux_cmsg->cmsg_type == -1 ||
 1597                             cm->cmsg_level != SOL_SOCKET) {
 1598                                 linux_msg(curthread,
 1599                                     "unsupported recvmsg cmsg level %d type %d",
 1600                                     cm->cmsg_level, cm->cmsg_type);
 1601                                 error = EINVAL;
 1602                                 goto bad;
 1603                         }
 1604 
 1605                         data = CMSG_DATA(cm);
 1606                         datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
 1607 
 1608                         switch (cm->cmsg_type) {
 1609                         case SCM_RIGHTS:
 1610                                 if (flags & LINUX_MSG_CMSG_CLOEXEC) {
 1611                                         fds = datalen / sizeof(int);
 1612                                         fdp = data;
 1613                                         for (i = 0; i < fds; i++) {
 1614                                                 fd = *fdp++;
 1615                                                 (void)kern_fcntl(td, fd,
 1616                                                     F_SETFD, FD_CLOEXEC);
 1617                                         }
 1618                                 }
 1619                                 break;
 1620 
 1621                         case SCM_CREDS:
 1622                                 /*
 1623                                  * Currently LOCAL_CREDS is never in
 1624                                  * effect for Linux so no need to worry
 1625                                  * about sockcred
 1626                                  */
 1627                                 if (datalen != sizeof(*cmcred)) {
 1628                                         error = EMSGSIZE;
 1629                                         goto bad;
 1630                                 }
 1631                                 cmcred = (struct cmsgcred *)data;
 1632                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1633                                 linux_ucred.pid = cmcred->cmcred_pid;
 1634                                 linux_ucred.uid = cmcred->cmcred_uid;
 1635                                 linux_ucred.gid = cmcred->cmcred_gid;
 1636                                 data = &linux_ucred;
 1637                                 datalen = sizeof(linux_ucred);
 1638                                 break;
 1639 
 1640                         case SCM_CREDS2:
 1641                                 scred = data;
 1642                                 bzero(&linux_ucred, sizeof(linux_ucred));
 1643                                 linux_ucred.pid = scred->sc_pid;
 1644                                 linux_ucred.uid = scred->sc_uid;
 1645                                 linux_ucred.gid = scred->sc_gid;
 1646                                 data = &linux_ucred;
 1647                                 datalen = sizeof(linux_ucred);
 1648                                 break;
 1649 
 1650                         case SCM_TIMESTAMP:
 1651                                 if (datalen != sizeof(struct timeval)) {
 1652                                         error = EMSGSIZE;
 1653                                         goto bad;
 1654                                 }
 1655                                 ftmvl = (struct timeval *)data;
 1656                                 ltmvl.tv_sec = ftmvl->tv_sec;
 1657                                 ltmvl.tv_usec = ftmvl->tv_usec;
 1658                                 data = &ltmvl;
 1659                                 datalen = sizeof(ltmvl);
 1660                                 break;
 1661                         }
 1662 
 1663                         if (outlen + LINUX_CMSG_LEN(datalen) > maxlen) {
 1664                                 if (outlen == 0) {
 1665                                         error = EMSGSIZE;
 1666                                         goto bad;
 1667                                 } else {
 1668                                         linux_msghdr.msg_flags |= LINUX_MSG_CTRUNC;
 1669                                         m_dispose_extcontrolm(control);
 1670                                         goto out;
 1671                                 }
 1672                         }
 1673 
 1674                         linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen);
 1675 
 1676                         error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ);
 1677                         if (error != 0)
 1678                                 goto bad;
 1679                         outbuf += L_CMSG_HDRSZ;
 1680 
 1681                         error = copyout(data, outbuf, datalen);
 1682                         if (error != 0)
 1683                                 goto bad;
 1684 
 1685                         outbuf += LINUX_CMSG_ALIGN(datalen);
 1686                         outlen += LINUX_CMSG_LEN(datalen);
 1687 
 1688                         cm = CMSG_NXTHDR(msg, cm);
 1689                 }
 1690                 linux_msghdr.msg_controllen = outlen;
 1691         }
 1692 
 1693 out:
 1694         error = copyout(&linux_msghdr, msghdr, sizeof(linux_msghdr));
 1695 
 1696 bad:
 1697         if (control != NULL) {
 1698                 if (error != 0)
 1699                         m_dispose_extcontrolm(control);
 1700                 m_freem(control);
 1701         }
 1702         free(iov, M_IOV);
 1703         free(linux_cmsg, M_LINUX);
 1704         free(sa, M_SONAME);
 1705 
 1706         return (error);
 1707 }
 1708 
 1709 int
 1710 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args)
 1711 {
 1712         struct msghdr bsd_msg;
 1713 
 1714         return (linux_recvmsg_common(td, args->s, PTRIN(args->msg),
 1715             args->flags, &bsd_msg));
 1716 }
 1717 
 1718 int
 1719 linux_recvmmsg(struct thread *td, struct linux_recvmmsg_args *args)
 1720 {
 1721         struct l_mmsghdr *msg;
 1722         struct msghdr bsd_msg;
 1723         struct l_timespec lts;
 1724         struct timespec ts, tts;
 1725         l_uint retval;
 1726         int error, datagrams;
 1727 
 1728         if (args->timeout) {
 1729                 error = copyin(args->timeout, &lts, sizeof(struct l_timespec));
 1730                 if (error != 0)
 1731                         return (error);
 1732                 error = linux_to_native_timespec(&ts, &lts);
 1733                 if (error != 0)
 1734                         return (error);
 1735                 getnanotime(&tts);
 1736                 timespecadd(&tts, &ts, &tts);
 1737         }
 1738 
 1739         msg = PTRIN(args->msg);
 1740         datagrams = 0;
 1741         while (datagrams < args->vlen) {
 1742                 error = linux_recvmsg_common(td, args->s, &msg->msg_hdr,
 1743                     args->flags & ~LINUX_MSG_WAITFORONE, &bsd_msg);
 1744                 if (error != 0)
 1745                         break;
 1746 
 1747                 retval = td->td_retval[0];
 1748                 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len));
 1749                 if (error != 0)
 1750                         break;
 1751                 ++msg;
 1752                 ++datagrams;
 1753 
 1754                 /*
 1755                  * MSG_WAITFORONE turns on MSG_DONTWAIT after one packet.
 1756                  */
 1757                 if (args->flags & LINUX_MSG_WAITFORONE)
 1758                         args->flags |= LINUX_MSG_DONTWAIT;
 1759 
 1760                 /*
 1761                  * See BUGS section of recvmmsg(2).
 1762                  */
 1763                 if (args->timeout) {
 1764                         getnanotime(&ts);
 1765                         timespecsub(&ts, &tts, &ts);
 1766                         if (!timespecisset(&ts) || ts.tv_sec > 0)
 1767                                 break;
 1768                 }
 1769                 /* Out of band data, return right away. */
 1770                 if (bsd_msg.msg_flags & MSG_OOB)
 1771                         break;
 1772         }
 1773         if (error == 0)
 1774                 td->td_retval[0] = datagrams;
 1775         return (error);
 1776 }
 1777 
 1778 int
 1779 linux_shutdown(struct thread *td, struct linux_shutdown_args *args)
 1780 {
 1781 
 1782         return (kern_shutdown(td, args->s, args->how));
 1783 }
 1784 
 1785 int
 1786 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 1787 {
 1788         l_timeval linux_tv;
 1789         struct sockaddr *sa;
 1790         struct timeval tv;
 1791         socklen_t len;
 1792         int error, level, name;
 1793 
 1794         level = linux_to_bsd_sockopt_level(args->level);
 1795         switch (level) {
 1796         case SOL_SOCKET:
 1797                 name = linux_to_bsd_so_sockopt(args->optname);
 1798                 switch (name) {
 1799                 case LOCAL_CREDS_PERSISTENT:
 1800                         level = SOL_LOCAL;
 1801                         break;
 1802                 case SO_RCVTIMEO:
 1803                         /* FALLTHROUGH */
 1804                 case SO_SNDTIMEO:
 1805                         error = copyin(PTRIN(args->optval), &linux_tv,
 1806                             sizeof(linux_tv));
 1807                         if (error != 0)
 1808                                 return (error);
 1809                         tv.tv_sec = linux_tv.tv_sec;
 1810                         tv.tv_usec = linux_tv.tv_usec;
 1811                         return (kern_setsockopt(td, args->s, level,
 1812                             name, &tv, UIO_SYSSPACE, sizeof(tv)));
 1813                         /* NOTREACHED */
 1814                 default:
 1815                         break;
 1816                 }
 1817                 break;
 1818         case IPPROTO_IP:
 1819                 if (args->optname == LINUX_IP_RECVERR &&
 1820                     linux_ignore_ip_recverr) {
 1821                         /*
 1822                          * XXX: This is a hack to unbreak DNS resolution
 1823                          *      with glibc 2.30 and above.
 1824                          */
 1825                         return (0);
 1826                 }
 1827                 name = linux_to_bsd_ip_sockopt(args->optname);
 1828                 break;
 1829         case IPPROTO_IPV6:
 1830                 name = linux_to_bsd_ip6_sockopt(args->optname);
 1831                 break;
 1832         case IPPROTO_TCP:
 1833                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1834                 break;
 1835         default:
 1836                 name = -1;
 1837                 break;
 1838         }
 1839         if (name < 0) {
 1840                 if (name == -1)
 1841                         linux_msg(curthread,
 1842                             "unsupported setsockopt level %d optname %d",
 1843                             args->level, args->optname);
 1844                 return (ENOPROTOOPT);
 1845         }
 1846 
 1847         if (name == IPV6_NEXTHOP) {
 1848                 len = args->optlen;
 1849                 error = linux_to_bsd_sockaddr(PTRIN(args->optval), &sa, &len);
 1850                 if (error != 0)
 1851                         return (error);
 1852 
 1853                 error = kern_setsockopt(td, args->s, level,
 1854                     name, sa, UIO_SYSSPACE, len);
 1855                 free(sa, M_SONAME);
 1856         } else {
 1857                 error = kern_setsockopt(td, args->s, level,
 1858                     name, PTRIN(args->optval), UIO_USERSPACE, args->optlen);
 1859         }
 1860 
 1861         return (error);
 1862 }
 1863 
 1864 int
 1865 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args)
 1866 {
 1867         l_timeval linux_tv;
 1868         struct timeval tv;
 1869         socklen_t tv_len, xulen, len;
 1870         struct sockaddr *sa;
 1871         struct xucred xu;
 1872         struct l_ucred lxu;
 1873         int error, level, name, newval;
 1874 
 1875         level = linux_to_bsd_sockopt_level(args->level);
 1876         switch (level) {
 1877         case SOL_SOCKET:
 1878                 name = linux_to_bsd_so_sockopt(args->optname);
 1879                 switch (name) {
 1880                 case LOCAL_CREDS_PERSISTENT:
 1881                         level = SOL_LOCAL;
 1882                         break;
 1883                 case SO_RCVTIMEO:
 1884                         /* FALLTHROUGH */
 1885                 case SO_SNDTIMEO:
 1886                         tv_len = sizeof(tv);
 1887                         error = kern_getsockopt(td, args->s, level,
 1888                             name, &tv, UIO_SYSSPACE, &tv_len);
 1889                         if (error != 0)
 1890                                 return (error);
 1891                         linux_tv.tv_sec = tv.tv_sec;
 1892                         linux_tv.tv_usec = tv.tv_usec;
 1893                         return (copyout(&linux_tv, PTRIN(args->optval),
 1894                             sizeof(linux_tv)));
 1895                         /* NOTREACHED */
 1896                 case LOCAL_PEERCRED:
 1897                         if (args->optlen < sizeof(lxu))
 1898                                 return (EINVAL);
 1899                         /*
 1900                          * LOCAL_PEERCRED is not served at the SOL_SOCKET level,
 1901                          * but by the Unix socket's level 0.
 1902                          */
 1903                         level = 0;
 1904                         xulen = sizeof(xu);
 1905                         error = kern_getsockopt(td, args->s, level,
 1906                             name, &xu, UIO_SYSSPACE, &xulen);
 1907                         if (error != 0)
 1908                                 return (error);
 1909                         lxu.pid = xu.cr_pid;
 1910                         lxu.uid = xu.cr_uid;
 1911                         lxu.gid = xu.cr_gid;
 1912                         return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu)));
 1913                         /* NOTREACHED */
 1914                 case SO_ERROR:
 1915                         len = sizeof(newval);
 1916                         error = kern_getsockopt(td, args->s, level,
 1917                             name, &newval, UIO_SYSSPACE, &len);
 1918                         if (error != 0)
 1919                                 return (error);
 1920                         newval = -bsd_to_linux_errno(newval);
 1921                         return (copyout(&newval, PTRIN(args->optval), len));
 1922                         /* NOTREACHED */
 1923                 default:
 1924                         break;
 1925                 }
 1926                 break;
 1927         case IPPROTO_IP:
 1928                 name = linux_to_bsd_ip_sockopt(args->optname);
 1929                 break;
 1930         case IPPROTO_IPV6:
 1931                 name = linux_to_bsd_ip6_sockopt(args->optname);
 1932                 break;
 1933         case IPPROTO_TCP:
 1934                 name = linux_to_bsd_tcp_sockopt(args->optname);
 1935                 break;
 1936         default:
 1937                 name = -1;
 1938                 break;
 1939         }
 1940         if (name < 0) {
 1941                 if (name == -1)
 1942                         linux_msg(curthread,
 1943                             "unsupported getsockopt level %d optname %d",
 1944                             args->level, args->optname);
 1945                 return (EINVAL);
 1946         }
 1947 
 1948         if (name == IPV6_NEXTHOP) {
 1949                 error = copyin(PTRIN(args->optlen), &len, sizeof(len));
 1950                 if (error != 0)
 1951                         return (error);
 1952                 sa = malloc(len, M_SONAME, M_WAITOK);
 1953 
 1954                 error = kern_getsockopt(td, args->s, level,
 1955                     name, sa, UIO_SYSSPACE, &len);
 1956                 if (error != 0)
 1957                         goto out;
 1958 
 1959                 error = linux_copyout_sockaddr(sa, PTRIN(args->optval), len);
 1960                 if (error == 0)
 1961                         error = copyout(&len, PTRIN(args->optlen),
 1962                             sizeof(len));
 1963 out:
 1964                 free(sa, M_SONAME);
 1965         } else {
 1966                 if (args->optval) {
 1967                         error = copyin(PTRIN(args->optlen), &len, sizeof(len));
 1968                         if (error != 0)
 1969                                 return (error);
 1970                 }
 1971                 error = kern_getsockopt(td, args->s, level,
 1972                     name, PTRIN(args->optval), UIO_USERSPACE, &len);
 1973                 if (error == 0)
 1974                         error = copyout(&len, PTRIN(args->optlen),
 1975                             sizeof(len));
 1976         }
 1977 
 1978         return (error);
 1979 }
 1980 
 1981 static int
 1982 linux_sendfile_common(struct thread *td, l_int out, l_int in,
 1983     l_loff_t *offset, l_size_t count)
 1984 {
 1985         off_t bytes_read;
 1986         int error;
 1987         l_loff_t current_offset;
 1988         struct file *fp;
 1989 
 1990         AUDIT_ARG_FD(in);
 1991         error = fget_read(td, in, &cap_pread_rights, &fp);
 1992         if (error != 0)
 1993                 return (error);
 1994 
 1995         if (offset != NULL) {
 1996                 current_offset = *offset;
 1997         } else {
 1998                 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ?
 1999                     fo_seek(fp, 0, SEEK_CUR, td) : ESPIPE;
 2000                 if (error != 0)
 2001                         goto drop;
 2002                 current_offset = td->td_uretoff.tdu_off;
 2003         }
 2004 
 2005         bytes_read = 0;
 2006 
 2007         /* Linux cannot have 0 count. */
 2008         if (count <= 0 || current_offset < 0) {
 2009                 error = EINVAL;
 2010                 goto drop;
 2011         }
 2012 
 2013         error = fo_sendfile(fp, out, NULL, NULL, current_offset, count,
 2014             &bytes_read, 0, td);
 2015         if (error != 0)
 2016                 goto drop;
 2017         current_offset += bytes_read;
 2018 
 2019         if (offset != NULL) {
 2020                 *offset = current_offset;
 2021         } else {
 2022                 error = fo_seek(fp, current_offset, SEEK_SET, td);
 2023                 if (error != 0)
 2024                         goto drop;
 2025         }
 2026 
 2027         td->td_retval[0] = (ssize_t)bytes_read;
 2028 drop:
 2029         fdrop(fp, td);
 2030         return (error);
 2031 }
 2032 
 2033 int
 2034 linux_sendfile(struct thread *td, struct linux_sendfile_args *arg)
 2035 {
 2036         /*
 2037          * Differences between FreeBSD and Linux sendfile:
 2038          * - Linux doesn't send anything when count is 0 (FreeBSD uses 0 to
 2039          *   mean send the whole file.)  In linux_sendfile given fds are still
 2040          *   checked for validity when the count is 0.
 2041          * - Linux can send to any fd whereas FreeBSD only supports sockets.
 2042          *   The same restriction follows for linux_sendfile.
 2043          * - Linux doesn't have an equivalent for FreeBSD's flags and sf_hdtr.
 2044          * - Linux takes an offset pointer and updates it to the read location.
 2045          *   FreeBSD takes in an offset and a 'bytes read' parameter which is
 2046          *   only filled if it isn't NULL.  We use this parameter to update the
 2047          *   offset pointer if it exists.
 2048          * - Linux sendfile returns bytes read on success while FreeBSD
 2049          *   returns 0.  We use the 'bytes read' parameter to get this value.
 2050          */
 2051 
 2052         l_loff_t offset64;
 2053         l_long offset;
 2054         int ret;
 2055         int error;
 2056 
 2057         if (arg->offset != NULL) {
 2058                 error = copyin(arg->offset, &offset, sizeof(offset));
 2059                 if (error != 0)
 2060                         return (error);
 2061                 offset64 = (l_loff_t)offset;
 2062         }
 2063 
 2064         ret = linux_sendfile_common(td, arg->out, arg->in,
 2065             arg->offset != NULL ? &offset64 : NULL, arg->count);
 2066 
 2067         if (arg->offset != NULL) {
 2068 #if defined(__i386__) || defined(__arm__) || \
 2069     (defined(__amd64__) && defined(COMPAT_LINUX32))
 2070                 if (offset64 > INT32_MAX)
 2071                         return (EOVERFLOW);
 2072 #endif
 2073                 offset = (l_long)offset64;
 2074                 error = copyout(&offset, arg->offset, sizeof(offset));
 2075                 if (error != 0)
 2076                         return (error);
 2077         }
 2078 
 2079         return (ret);
 2080 }
 2081 
 2082 #if defined(__i386__) || defined(__arm__) || \
 2083     (defined(__amd64__) && defined(COMPAT_LINUX32))
 2084 
 2085 int
 2086 linux_sendfile64(struct thread *td, struct linux_sendfile64_args *arg)
 2087 {
 2088         l_loff_t offset;
 2089         int ret;
 2090         int error;
 2091 
 2092         if (arg->offset != NULL) {
 2093                 error = copyin(arg->offset, &offset, sizeof(offset));
 2094                 if (error != 0)
 2095                         return (error);
 2096         }
 2097 
 2098         ret = linux_sendfile_common(td, arg->out, arg->in,
 2099                 arg->offset != NULL ? &offset : NULL, arg->count);
 2100 
 2101         if (arg->offset != NULL) {
 2102                 error = copyout(&offset, arg->offset, sizeof(offset));
 2103                 if (error != 0)
 2104                         return (error);
 2105         }
 2106 
 2107         return (ret);
 2108 }
 2109 
 2110 /* Argument list sizes for linux_socketcall */
 2111 static const unsigned char lxs_args_cnt[] = {
 2112         0 /* unused*/,          3 /* socket */,
 2113         3 /* bind */,           3 /* connect */,
 2114         2 /* listen */,         3 /* accept */,
 2115         3 /* getsockname */,    3 /* getpeername */,
 2116         4 /* socketpair */,     4 /* send */,
 2117         4 /* recv */,           6 /* sendto */,
 2118         6 /* recvfrom */,       2 /* shutdown */,
 2119         5 /* setsockopt */,     5 /* getsockopt */,
 2120         3 /* sendmsg */,        3 /* recvmsg */,
 2121         4 /* accept4 */,        5 /* recvmmsg */,
 2122         4 /* sendmmsg */,       4 /* sendfile */
 2123 };
 2124 #define LINUX_ARGS_CNT          (nitems(lxs_args_cnt) - 1)
 2125 #define LINUX_ARG_SIZE(x)       (lxs_args_cnt[x] * sizeof(l_ulong))
 2126 
 2127 int
 2128 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 2129 {
 2130         l_ulong a[6];
 2131 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 2132         register_t l_args[6];
 2133 #endif
 2134         void *arg;
 2135         int error;
 2136 
 2137         if (args->what < LINUX_SOCKET || args->what > LINUX_ARGS_CNT)
 2138                 return (EINVAL);
 2139         error = copyin(PTRIN(args->args), a, LINUX_ARG_SIZE(args->what));
 2140         if (error != 0)
 2141                 return (error);
 2142 
 2143 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 2144         for (int i = 0; i < lxs_args_cnt[args->what]; ++i)
 2145                 l_args[i] = a[i];
 2146         arg = l_args;
 2147 #else
 2148         arg = a;
 2149 #endif
 2150         switch (args->what) {
 2151         case LINUX_SOCKET:
 2152                 return (linux_socket(td, arg));
 2153         case LINUX_BIND:
 2154                 return (linux_bind(td, arg));
 2155         case LINUX_CONNECT:
 2156                 return (linux_connect(td, arg));
 2157         case LINUX_LISTEN:
 2158                 return (linux_listen(td, arg));
 2159         case LINUX_ACCEPT:
 2160                 return (linux_accept(td, arg));
 2161         case LINUX_GETSOCKNAME:
 2162                 return (linux_getsockname(td, arg));
 2163         case LINUX_GETPEERNAME:
 2164                 return (linux_getpeername(td, arg));
 2165         case LINUX_SOCKETPAIR:
 2166                 return (linux_socketpair(td, arg));
 2167         case LINUX_SEND:
 2168                 return (linux_send(td, arg));
 2169         case LINUX_RECV:
 2170                 return (linux_recv(td, arg));
 2171         case LINUX_SENDTO:
 2172                 return (linux_sendto(td, arg));
 2173         case LINUX_RECVFROM:
 2174                 return (linux_recvfrom(td, arg));
 2175         case LINUX_SHUTDOWN:
 2176                 return (linux_shutdown(td, arg));
 2177         case LINUX_SETSOCKOPT:
 2178                 return (linux_setsockopt(td, arg));
 2179         case LINUX_GETSOCKOPT:
 2180                 return (linux_getsockopt(td, arg));
 2181         case LINUX_SENDMSG:
 2182                 return (linux_sendmsg(td, arg));
 2183         case LINUX_RECVMSG:
 2184                 return (linux_recvmsg(td, arg));
 2185         case LINUX_ACCEPT4:
 2186                 return (linux_accept4(td, arg));
 2187         case LINUX_RECVMMSG:
 2188                 return (linux_recvmmsg(td, arg));
 2189         case LINUX_SENDMMSG:
 2190                 return (linux_sendmmsg(td, arg));
 2191         case LINUX_SENDFILE:
 2192                 return (linux_sendfile(td, arg));
 2193         }
 2194 
 2195         linux_msg(td, "socket type %d not implemented", args->what);
 2196         return (ENOSYS);
 2197 }
 2198 #endif /* __i386__ || __arm__ || (__amd64__ && COMPAT_LINUX32) */

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