sys_socket.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/5.2/sys/kern/sys_socket.c 116546 2003-06-18 18:16:40Z phk $");
   38 
   39 #include "opt_mac.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/file.h>
   44 #include <sys/filedesc.h>
   45 #include <sys/mac.h>
   46 #include <sys/protosw.h>
   47 #include <sys/sigio.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/filio.h>                  /* XXX */
   51 #include <sys/sockio.h>
   52 #include <sys/stat.h>
   53 #include <sys/uio.h>
   54 #include <sys/ucred.h>
   55 
   56 #include <net/if.h>
   57 #include <net/route.h>
   58 
   59 struct  fileops socketops = {
   60         .fo_read = soo_read,
   61         .fo_write = soo_write,
   62         .fo_ioctl = soo_ioctl,
   63         .fo_poll = soo_poll,
   64         .fo_kqfilter = soo_kqfilter,
   65         .fo_stat = soo_stat,
   66         .fo_close = soo_close,
   67         .fo_flags = DFLAG_PASSABLE
   68 };
   69 
   70 /* ARGSUSED */
   71 int
   72 soo_read(fp, uio, active_cred, flags, td)
   73         struct file *fp;
   74         struct uio *uio;
   75         struct ucred *active_cred;
   76         struct thread *td;
   77         int flags;
   78 {
   79         struct socket *so = fp->f_data;
   80         int error;
   81 
   82         mtx_lock(&Giant);
   83 #ifdef MAC
   84         error = mac_check_socket_receive(active_cred, so);
   85         if (error) {
   86                 mtx_unlock(&Giant);
   87                 return (error);
   88         }
   89 #endif
   90         error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0);
   91         mtx_unlock(&Giant);
   92         return (error);
   93 }
   94 
   95 /* ARGSUSED */
   96 int
   97 soo_write(fp, uio, active_cred, flags, td)
   98         struct file *fp;
   99         struct uio *uio;
  100         struct ucred *active_cred;
  101         struct thread *td;
  102         int flags;
  103 {
  104         struct socket *so = fp->f_data;
  105         int error;
  106 
  107         mtx_lock(&Giant);
  108 #ifdef MAC
  109         error = mac_check_socket_send(active_cred, so);
  110         if (error) {
  111                 mtx_unlock(&Giant);
  112                 return (error);
  113         }
  114 #endif
  115         error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0,
  116                                                     uio->uio_td);
  117         mtx_unlock(&Giant);
  118         return (error);
  119 }
  120 
  121 int
  122 soo_ioctl(fp, cmd, data, active_cred, td)
  123         struct file *fp;
  124         u_long cmd;
  125         void *data;
  126         struct ucred *active_cred;
  127         struct thread *td;
  128 {
  129         register struct socket *so = fp->f_data;
  130 
  131         switch (cmd) {
  132 
  133         case FIONBIO:
  134                 if (*(int *)data)
  135                         so->so_state |= SS_NBIO;
  136                 else
  137                         so->so_state &= ~SS_NBIO;
  138                 return (0);
  139 
  140         case FIOASYNC:
  141                 if (*(int *)data) {
  142                         so->so_state |= SS_ASYNC;
  143                         so->so_rcv.sb_flags |= SB_ASYNC;
  144                         so->so_snd.sb_flags |= SB_ASYNC;
  145                 } else {
  146                         so->so_state &= ~SS_ASYNC;
  147                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  148                         so->so_snd.sb_flags &= ~SB_ASYNC;
  149                 }
  150                 return (0);
  151 
  152         case FIONREAD:
  153                 *(int *)data = so->so_rcv.sb_cc;
  154                 return (0);
  155 
  156         case FIOSETOWN:
  157                 return (fsetown(*(int *)data, &so->so_sigio));
  158 
  159         case FIOGETOWN:
  160                 *(int *)data = fgetown(&so->so_sigio);
  161                 return (0);
  162 
  163         case SIOCSPGRP:
  164                 return (fsetown(-(*(int *)data), &so->so_sigio));
  165 
  166         case SIOCGPGRP:
  167                 *(int *)data = -fgetown(&so->so_sigio);
  168                 return (0);
  169 
  170         case SIOCATMARK:
  171                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
  172                 return (0);
  173         }
  174         /*
  175          * Interface/routing/protocol specific ioctls:
  176          * interface and routing ioctls should have a
  177          * different entry since a socket's unnecessary
  178          */
  179         if (IOCGROUP(cmd) == 'i')
  180                 return (ifioctl(so, cmd, data, td));
  181         if (IOCGROUP(cmd) == 'r')
  182                 return (rtioctl(cmd, data));
  183         return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td));
  184 }
  185 
  186 int
  187 soo_poll(fp, events, active_cred, td)
  188         struct file *fp;
  189         int events;
  190         struct ucred *active_cred;
  191         struct thread *td;
  192 {
  193         struct socket *so = fp->f_data;
  194         return so->so_proto->pr_usrreqs->pru_sopoll(so, events,
  195             fp->f_cred, td);
  196 }
  197 
  198 int
  199 soo_stat(fp, ub, active_cred, td)
  200         struct file *fp;
  201         struct stat *ub;
  202         struct ucred *active_cred;
  203         struct thread *td;
  204 {
  205         struct socket *so = fp->f_data;
  206 
  207         bzero((caddr_t)ub, sizeof (*ub));
  208         ub->st_mode = S_IFSOCK;
  209         /*
  210          * If SS_CANTRCVMORE is set, but there's still data left in the
  211          * receive buffer, the socket is still readable.
  212          */
  213         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
  214             so->so_rcv.sb_cc != 0)
  215                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  216         if ((so->so_state & SS_CANTSENDMORE) == 0)
  217                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  218         ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
  219         ub->st_uid = so->so_cred->cr_uid;
  220         ub->st_gid = so->so_cred->cr_gid;
  221         return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub));
  222 }
  223 
  224 /*
  225  * API socket close on file pointer.  We call soclose() to close the 
  226  * socket (including initiating closing protocols).  soclose() will
  227  * sorele() the file reference but the actual socket will not go away
  228  * until the socket's ref count hits 0.
  229  */
  230 /* ARGSUSED */
  231 int
  232 soo_close(fp, td)
  233         struct file *fp;
  234         struct thread *td;
  235 {
  236         int error = 0;
  237         struct socket *so;
  238 
  239         so = fp->f_data;
  240         fp->f_ops = &badfileops;
  241         fp->f_data = NULL;
  242 
  243         if (so)
  244                 error = soclose(so);
  245         return (error);
  246 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/sys_socket.c

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sys/kern/sys_socket.c