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: releng/8.3/sys/kern/sys_socket.c 220733 2011-04-16 23:30:53Z bz $");
   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_flags = DFLAG_PASSABLE
   68 };
   69 
   70 /* ARGSUSED */
   71 int
   72 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
   73     int flags, struct thread *td)
   74 {
   75         struct socket *so = fp->f_data;
   76         int error;
   77 
   78 #ifdef MAC
   79         error = mac_socket_check_receive(active_cred, so);
   80         if (error)
   81                 return (error);
   82 #endif
   83         error = soreceive(so, 0, uio, 0, 0, 0);
   84         return (error);
   85 }
   86 
   87 /* ARGSUSED */
   88 int
   89 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
   90     int flags, struct thread *td)
   91 {
   92         struct socket *so = fp->f_data;
   93         int error;
   94 
   95 #ifdef MAC
   96         error = mac_socket_check_send(active_cred, so);
   97         if (error)
   98                 return (error);
   99 #endif
  100         error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td);
  101         if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
  102                 PROC_LOCK(uio->uio_td->td_proc);
  103                 tdksignal(uio->uio_td, SIGPIPE, NULL);
  104                 PROC_UNLOCK(uio->uio_td->td_proc);
  105         }
  106         return (error);
  107 }
  108 
  109 int
  110 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
  111     struct thread *td)
  112 {
  113 
  114         return (EINVAL);
  115 }
  116 
  117 int
  118 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
  119     struct thread *td)
  120 {
  121         struct socket *so = fp->f_data;
  122         int error = 0;
  123 
  124         switch (cmd) {
  125         case FIONBIO:
  126                 SOCK_LOCK(so);
  127                 if (*(int *)data)
  128                         so->so_state |= SS_NBIO;
  129                 else
  130                         so->so_state &= ~SS_NBIO;
  131                 SOCK_UNLOCK(so);
  132                 break;
  133 
  134         case FIOASYNC:
  135                 /*
  136                  * XXXRW: This code separately acquires SOCK_LOCK(so) and
  137                  * SOCKBUF_LOCK(&so->so_rcv) even though they are the same
  138                  * mutex to avoid introducing the assumption that they are
  139                  * the same.
  140                  */
  141                 if (*(int *)data) {
  142                         SOCK_LOCK(so);
  143                         so->so_state |= SS_ASYNC;
  144                         SOCK_UNLOCK(so);
  145                         SOCKBUF_LOCK(&so->so_rcv);
  146                         so->so_rcv.sb_flags |= SB_ASYNC;
  147                         SOCKBUF_UNLOCK(&so->so_rcv);
  148                         SOCKBUF_LOCK(&so->so_snd);
  149                         so->so_snd.sb_flags |= SB_ASYNC;
  150                         SOCKBUF_UNLOCK(&so->so_snd);
  151                 } else {
  152                         SOCK_LOCK(so);
  153                         so->so_state &= ~SS_ASYNC;
  154                         SOCK_UNLOCK(so);
  155                         SOCKBUF_LOCK(&so->so_rcv);
  156                         so->so_rcv.sb_flags &= ~SB_ASYNC;
  157                         SOCKBUF_UNLOCK(&so->so_rcv);
  158                         SOCKBUF_LOCK(&so->so_snd);
  159                         so->so_snd.sb_flags &= ~SB_ASYNC;
  160                         SOCKBUF_UNLOCK(&so->so_snd);
  161                 }
  162                 break;
  163 
  164         case FIONREAD:
  165                 /* Unlocked read. */
  166                 *(int *)data = so->so_rcv.sb_cc;
  167                 break;
  168 
  169         case FIONWRITE:
  170                 /* Unlocked read. */
  171                 *(int *)data = so->so_snd.sb_cc;
  172                 break;
  173 
  174         case FIONSPACE:
  175                 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) ||
  176                     (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
  177                         *(int *)data = 0;
  178                 else
  179                         *(int *)data = sbspace(&so->so_snd);
  180                 break;
  181 
  182         case FIOSETOWN:
  183                 error = fsetown(*(int *)data, &so->so_sigio);
  184                 break;
  185 
  186         case FIOGETOWN:
  187                 *(int *)data = fgetown(&so->so_sigio);
  188                 break;
  189 
  190         case SIOCSPGRP:
  191                 error = fsetown(-(*(int *)data), &so->so_sigio);
  192                 break;
  193 
  194         case SIOCGPGRP:
  195                 *(int *)data = -fgetown(&so->so_sigio);
  196                 break;
  197 
  198         case SIOCATMARK:
  199                 /* Unlocked read. */
  200                 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
  201                 break;
  202         default:
  203                 /*
  204                  * Interface/routing/protocol specific ioctls: interface and
  205                  * routing ioctls should have a different entry since a
  206                  * socket is unnecessary.
  207                  */
  208                 if (IOCGROUP(cmd) == 'i')
  209                         error = ifioctl(so, cmd, data, td);
  210                 else if (IOCGROUP(cmd) == 'r') {
  211                         CURVNET_SET(so->so_vnet);
  212                         error = rtioctl_fib(cmd, data, so->so_fibnum);
  213                         CURVNET_RESTORE();
  214                 } else {
  215                         CURVNET_SET(so->so_vnet);
  216                         error = ((*so->so_proto->pr_usrreqs->pru_control)
  217                             (so, cmd, data, 0, td));
  218                         CURVNET_RESTORE();
  219                 }
  220                 break;
  221         }
  222         return (error);
  223 }
  224 
  225 int
  226 soo_poll(struct file *fp, int events, struct ucred *active_cred,
  227     struct thread *td)
  228 {
  229         struct socket *so = fp->f_data;
  230 #ifdef MAC
  231         int error;
  232 
  233         error = mac_socket_check_poll(active_cred, so);
  234         if (error)
  235                 return (error);
  236 #endif
  237         return (sopoll(so, events, fp->f_cred, td));
  238 }
  239 
  240 int
  241 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
  242     struct thread *td)
  243 {
  244         struct socket *so = fp->f_data;
  245 #ifdef MAC
  246         int error;
  247 #endif
  248 
  249         bzero((caddr_t)ub, sizeof (*ub));
  250         ub->st_mode = S_IFSOCK;
  251 #ifdef MAC
  252         error = mac_socket_check_stat(active_cred, so);
  253         if (error)
  254                 return (error);
  255 #endif
  256         /*
  257          * If SBS_CANTRCVMORE is set, but there's still data left in the
  258          * receive buffer, the socket is still readable.
  259          */
  260         SOCKBUF_LOCK(&so->so_rcv);
  261         if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
  262             so->so_rcv.sb_cc != 0)
  263                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
  264         ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
  265         SOCKBUF_UNLOCK(&so->so_rcv);
  266         /* Unlocked read. */
  267         if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
  268                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
  269         ub->st_uid = so->so_cred->cr_uid;
  270         ub->st_gid = so->so_cred->cr_gid;
  271         return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
  272 }
  273 
  274 /*
  275  * API socket close on file pointer.  We call soclose() to close the socket
  276  * (including initiating closing protocols).  soclose() will sorele() the
  277  * file reference but the actual socket will not go away until the socket's
  278  * ref count hits 0.
  279  */
  280 /* ARGSUSED */
  281 int
  282 soo_close(struct file *fp, struct thread *td)
  283 {
  284         int error = 0;
  285         struct socket *so;
  286 
  287         so = fp->f_data;
  288         fp->f_ops = &badfileops;
  289         fp->f_data = NULL;
  290 
  291         if (so)
  292                 error = soclose(so);
  293         return (error);
  294 }

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