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  * $FreeBSD: releng/5.0/sys/kern/sys_socket.c 106314 2002-11-01 21:31:13Z kbyanc $
   35  */
   36 
   37 #include "opt_mac.h"
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/file.h>
   42 #include <sys/mac.h>
   43 #include <sys/protosw.h>
   44 #include <sys/socket.h>
   45 #include <sys/socketvar.h>
   46 #include <sys/filio.h>                  /* XXX */
   47 #include <sys/sockio.h>
   48 #include <sys/stat.h>
   49 #include <sys/uio.h>
   50 #include <sys/filedesc.h>
   51 #include <sys/ucred.h>
   52 
   53 #include <net/if.h>
   54 #include <net/route.h>
   55 
   56 struct  fileops socketops = {
   57         soo_read, soo_write, soo_ioctl, soo_poll, sokqfilter,
   58         soo_stat, soo_close
   59 };
   60 
   61 /* ARGSUSED */
   62 int
   63 soo_read(fp, uio, active_cred, flags, td)
   64         struct file *fp;
   65         struct uio *uio;
   66         struct ucred *active_cred;
   67         struct thread *td;
   68         int flags;
   69 {
   70         struct socket *so = (struct socket *)fp->f_data;
   71         int error;
   72 
   73         mtx_lock(&Giant);
   74 #ifdef MAC
   75         error = mac_check_socket_receive(active_cred, so);
   76         if (error) {
   77                 mtx_unlock(&Giant);
   78                 return (error);
   79         }
   80 #endif
   81         error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0);
   82         mtx_unlock(&Giant);
   83         return (error);
   84 }
   85 
   86 /* ARGSUSED */
   87 int
   88 soo_write(fp, uio, active_cred, flags, td)
   89         struct file *fp;
   90         struct uio *uio;
   91         struct ucred *active_cred;
   92         struct thread *td;
   93         int flags;
   94 {
   95         struct socket *so = (struct socket *)fp->f_data;
   96         int error;
   97 
   98         mtx_lock(&Giant);
   99 #ifdef MAC
  100         error = mac_check_socket_send(active_cred, so);
  101         if (error) {
  102                 mtx_unlock(&Giant);
  103                 return (error);
  104         }
  105 #endif
  106         error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0,
  107                                                     uio->uio_td);
  108         mtx_unlock(&Giant);
  109         return (error);
  110 }
  111 
  112 int
  113 soo_ioctl(fp, cmd, data, active_cred, td)
  114         struct file *fp;
  115         u_long cmd;
  116         void *data;
  117         struct ucred *active_cred;
  118         struct thread *td;
  119 {
  120         register struct socket *so = (struct socket *)fp->f_data;
  121 
  122         switch (cmd) {
  123 
  124         case FIONBIO:
  125                 if (*(int *)data)
  126                         so->so_state |= SS_NBIO;
  127                 else
  128                         so->so_state &= ~SS_NBIO;
  129                 return (0);
  130 
  131         case FIOASYNC:
  132                 if (*(int *)data) {
  133                         so->so_state |= SS_ASYNC;
  134                         so->so_rcv.sb_flags |= SB_ASYNC;
  135                         so->so_snd.sb_flags |= SB_ASYNC;
  136                 } else {
  137                         so->so_state &= ~SS_ASYNC;
  138                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  139                         so->so_snd.sb_flags &= ~SB_ASYNC;
  140                 }
  141                 return (0);
  142 
  143         case FIONREAD:
  144                 *(int *)data = so->so_rcv.sb_cc;
  145                 return (0);
  146 
  147         case FIOSETOWN:
  148                 return (fsetown(*(int *)data, &so->so_sigio));
  149 
  150         case FIOGETOWN:
  151                 *(int *)data = fgetown(&so->so_sigio);
  152                 return (0);
  153 
  154         case SIOCSPGRP:
  155                 return (fsetown(-(*(int *)data), &so->so_sigio));
  156 
  157         case SIOCGPGRP:
  158                 *(int *)data = -fgetown(&so->so_sigio);
  159                 return (0);
  160 
  161         case SIOCATMARK:
  162                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
  163                 return (0);
  164         }
  165         /*
  166          * Interface/routing/protocol specific ioctls:
  167          * interface and routing ioctls should have a
  168          * different entry since a socket's unnecessary
  169          */
  170         if (IOCGROUP(cmd) == 'i')
  171                 return (ifioctl(so, cmd, data, td));
  172         if (IOCGROUP(cmd) == 'r')
  173                 return (rtioctl(cmd, data));
  174         return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td));
  175 }
  176 
  177 int
  178 soo_poll(fp, events, active_cred, td)
  179         struct file *fp;
  180         int events;
  181         struct ucred *active_cred;
  182         struct thread *td;
  183 {
  184         struct socket *so = (struct socket *)fp->f_data;
  185         return so->so_proto->pr_usrreqs->pru_sopoll(so, events,
  186             fp->f_cred, td);
  187 }
  188 
  189 int
  190 soo_stat(fp, ub, active_cred, td)
  191         struct file *fp;
  192         struct stat *ub;
  193         struct ucred *active_cred;
  194         struct thread *td;
  195 {
  196         struct socket *so = (struct socket *)fp->f_data;
  197 
  198         bzero((caddr_t)ub, sizeof (*ub));
  199         ub->st_mode = S_IFSOCK;
  200         /*
  201          * If SS_CANTRCVMORE is set, but there's still data left in the
  202          * receive buffer, the socket is still readable.
  203          */
  204         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
  205             so->so_rcv.sb_cc != 0)
  206                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  207         if ((so->so_state & SS_CANTSENDMORE) == 0)
  208                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  209         ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
  210         ub->st_uid = so->so_cred->cr_uid;
  211         ub->st_gid = so->so_cred->cr_gid;
  212         return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub));
  213 }
  214 
  215 /*
  216  * API socket close on file pointer.  We call soclose() to close the 
  217  * socket (including initiating closing protocols).  soclose() will
  218  * sorele() the file reference but the actual socket will not go away
  219  * until the socket's ref count hits 0.
  220  */
  221 /* ARGSUSED */
  222 int
  223 soo_close(fp, td)
  224         struct file *fp;
  225         struct thread *td;
  226 {
  227         int error = 0;
  228         struct socket *so;
  229 
  230         so = (struct socket *)fp->f_data;
  231         fp->f_ops = &badfileops;
  232         fp->f_data = 0;
  233 
  234         if (so)
  235                 error = soclose(so);
  236         return (error);
  237 }

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

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sys/kern/sys_socket.c