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/kern/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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)sys_socket.c        8.1 (Berkeley) 6/10/93
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/10/sys/kern/sys_socket.c 254356 2013-08-15 07:54:31Z glebius $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/file.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/proc.h>
   40 #include <sys/protosw.h>
   41 #include <sys/sigio.h>
   42 #include <sys/signal.h>
   43 #include <sys/signalvar.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/ucred.h>
   51 
   52 #include <net/if.h>
   53 #include <net/route.h>
   54 #include <net/vnet.h>
   55 
   56 #include <security/mac/mac_framework.h>
   57 
   58 struct fileops  socketops = {
   59         .fo_read = soo_read,
   60         .fo_write = soo_write,
   61         .fo_truncate = soo_truncate,
   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_chmod = invfo_chmod,
   68         .fo_chown = invfo_chown,
   69         .fo_sendfile = invfo_sendfile,
   70         .fo_flags = DFLAG_PASSABLE
   71 };
   72 
   73 /* ARGSUSED */
   74 int
   75 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
   76     int flags, struct thread *td)
   77 {
   78         struct socket *so = fp->f_data;
   79         int error;
   80 
   81 #ifdef MAC
   82         error = mac_socket_check_receive(active_cred, so);
   83         if (error)
   84                 return (error);
   85 #endif
   86         error = soreceive(so, 0, uio, 0, 0, 0);
   87         return (error);
   88 }
   89 
   90 /* ARGSUSED */
   91 int
   92 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
   93     int flags, struct thread *td)
   94 {
   95         struct socket *so = fp->f_data;
   96         int error;
   97 
   98 #ifdef MAC
   99         error = mac_socket_check_send(active_cred, so);
  100         if (error)
  101                 return (error);
  102 #endif
  103         error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td);
  104         if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
  105                 PROC_LOCK(uio->uio_td->td_proc);
  106                 tdsignal(uio->uio_td, SIGPIPE);
  107                 PROC_UNLOCK(uio->uio_td->td_proc);
  108         }
  109         return (error);
  110 }
  111 
  112 int
  113 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
  114     struct thread *td)
  115 {
  116 
  117         return (EINVAL);
  118 }
  119 
  120 int
  121 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
  122     struct thread *td)
  123 {
  124         struct socket *so = fp->f_data;
  125         int error = 0;
  126 
  127         switch (cmd) {
  128         case FIONBIO:
  129                 SOCK_LOCK(so);
  130                 if (*(int *)data)
  131                         so->so_state |= SS_NBIO;
  132                 else
  133                         so->so_state &= ~SS_NBIO;
  134                 SOCK_UNLOCK(so);
  135                 break;
  136 
  137         case FIOASYNC:
  138                 /*
  139                  * XXXRW: This code separately acquires SOCK_LOCK(so) and
  140                  * SOCKBUF_LOCK(&so->so_rcv) even though they are the same
  141                  * mutex to avoid introducing the assumption that they are
  142                  * the same.
  143                  */
  144                 if (*(int *)data) {
  145                         SOCK_LOCK(so);
  146                         so->so_state |= SS_ASYNC;
  147                         SOCK_UNLOCK(so);
  148                         SOCKBUF_LOCK(&so->so_rcv);
  149                         so->so_rcv.sb_flags |= SB_ASYNC;
  150                         SOCKBUF_UNLOCK(&so->so_rcv);
  151                         SOCKBUF_LOCK(&so->so_snd);
  152                         so->so_snd.sb_flags |= SB_ASYNC;
  153                         SOCKBUF_UNLOCK(&so->so_snd);
  154                 } else {
  155                         SOCK_LOCK(so);
  156                         so->so_state &= ~SS_ASYNC;
  157                         SOCK_UNLOCK(so);
  158                         SOCKBUF_LOCK(&so->so_rcv);
  159                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  160                         SOCKBUF_UNLOCK(&so->so_rcv);
  161                         SOCKBUF_LOCK(&so->so_snd);
  162                         so->so_snd.sb_flags &= ~SB_ASYNC;
  163                         SOCKBUF_UNLOCK(&so->so_snd);
  164                 }
  165                 break;
  166 
  167         case FIONREAD:
  168                 /* Unlocked read. */
  169                 *(int *)data = so->so_rcv.sb_cc;
  170                 break;
  171 
  172         case FIONWRITE:
  173                 /* Unlocked read. */
  174                 *(int *)data = so->so_snd.sb_cc;
  175                 break;
  176 
  177         case FIONSPACE:
  178                 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) ||
  179                     (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
  180                         *(int *)data = 0;
  181                 else
  182                         *(int *)data = sbspace(&so->so_snd);
  183                 break;
  184 
  185         case FIOSETOWN:
  186                 error = fsetown(*(int *)data, &so->so_sigio);
  187                 break;
  188 
  189         case FIOGETOWN:
  190                 *(int *)data = fgetown(&so->so_sigio);
  191                 break;
  192 
  193         case SIOCSPGRP:
  194                 error = fsetown(-(*(int *)data), &so->so_sigio);
  195                 break;
  196 
  197         case SIOCGPGRP:
  198                 *(int *)data = -fgetown(&so->so_sigio);
  199                 break;
  200 
  201         case SIOCATMARK:
  202                 /* Unlocked read. */
  203                 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
  204                 break;
  205         default:
  206                 /*
  207                  * Interface/routing/protocol specific ioctls: interface and
  208                  * routing ioctls should have a different entry since a
  209                  * socket is unnecessary.
  210                  */
  211                 if (IOCGROUP(cmd) == 'i')
  212                         error = ifioctl(so, cmd, data, td);
  213                 else if (IOCGROUP(cmd) == 'r') {
  214                         CURVNET_SET(so->so_vnet);
  215                         error = rtioctl_fib(cmd, data, so->so_fibnum);
  216                         CURVNET_RESTORE();
  217                 } else {
  218                         CURVNET_SET(so->so_vnet);
  219                         error = ((*so->so_proto->pr_usrreqs->pru_control)
  220                             (so, cmd, data, 0, td));
  221                         CURVNET_RESTORE();
  222                 }
  223                 break;
  224         }
  225         return (error);
  226 }
  227 
  228 int
  229 soo_poll(struct file *fp, int events, struct ucred *active_cred,
  230     struct thread *td)
  231 {
  232         struct socket *so = fp->f_data;
  233 #ifdef MAC
  234         int error;
  235 
  236         error = mac_socket_check_poll(active_cred, so);
  237         if (error)
  238                 return (error);
  239 #endif
  240         return (sopoll(so, events, fp->f_cred, td));
  241 }
  242 
  243 int
  244 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
  245     struct thread *td)
  246 {
  247         struct socket *so = fp->f_data;
  248 #ifdef MAC
  249         int error;
  250 #endif
  251 
  252         bzero((caddr_t)ub, sizeof (*ub));
  253         ub->st_mode = S_IFSOCK;
  254 #ifdef MAC
  255         error = mac_socket_check_stat(active_cred, so);
  256         if (error)
  257                 return (error);
  258 #endif
  259         /*
  260          * If SBS_CANTRCVMORE is set, but there's still data left in the
  261          * receive buffer, the socket is still readable.
  262          */
  263         SOCKBUF_LOCK(&so->so_rcv);
  264         if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
  265             so->so_rcv.sb_cc != 0)
  266                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  267         ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
  268         SOCKBUF_UNLOCK(&so->so_rcv);
  269         /* Unlocked read. */
  270         if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
  271                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  272         ub->st_uid = so->so_cred->cr_uid;
  273         ub->st_gid = so->so_cred->cr_gid;
  274         return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
  275 }
  276 
  277 /*
  278  * API socket close on file pointer.  We call soclose() to close the socket
  279  * (including initiating closing protocols).  soclose() will sorele() the
  280  * file reference but the actual socket will not go away until the socket's
  281  * ref count hits 0.
  282  */
  283 /* ARGSUSED */
  284 int
  285 soo_close(struct file *fp, struct thread *td)
  286 {
  287         int error = 0;
  288         struct socket *so;
  289 
  290         so = fp->f_data;
  291         fp->f_ops = &badfileops;
  292         fp->f_data = NULL;
  293 
  294         if (so)
  295                 error = soclose(so);
  296         return (error);
  297 }

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