sys/kern/sys_socket.c

   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. 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  * $FreeBSD: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/file.h>
  36 #include <sys/lock.h>
  37 #include <sys/protosw.h>
  38 #include <sys/signalvar.h>
  39 #include <sys/socket.h>
  40 #include <sys/socketvar.h>
  41 #include <sys/socketops.h>
  42 #include <sys/filio.h>                  /* XXX */
  43 #include <sys/sockio.h>
  44 #include <sys/vnode.h>
  45 #include <sys/stat.h>
  46 #include <sys/uio.h>
  47 #include <sys/filedesc.h>
  48 #include <sys/ucred.h>
  49
  50 #include <sys/socketvar2.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_var.h>
  54 #include <net/route.h>
  55
  56 struct  fileops socketops = {
  57         .fo_read = soo_read,
  58         .fo_write = soo_write,
  59         .fo_ioctl = soo_ioctl,
  60         .fo_kqfilter = sokqfilter,
  61         .fo_stat = soo_stat,
  62         .fo_close = soo_close,
  63         .fo_shutdown = soo_shutdown
  64 };
  65
  66 /*
  67  * MPSAFE
  68  */
  69 int
  70 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  71 {
  72         struct socket *so;
  73         int error;
  74         int msgflags;
  75
  76         atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC);
  77
  78         so = (struct socket *)fp->f_data;
  79
  80         if (fflags & O_FBLOCKING)
  81                 msgflags = 0;
  82         else if (fflags & O_FNONBLOCKING)
  83                 msgflags = MSG_FNONBLOCKING;
  84         else if (fp->f_flag & FNONBLOCK)
  85                 msgflags = MSG_FNONBLOCKING;
  86         else
  87                 msgflags = 0;
  88
  89         error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
  90         return (error);
  91 }
  92
  93 /*
  94  * MPSAFE
  95  */
  96 int
  97 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  98 {
  99         struct socket *so;
 100         int error;
 101         int msgflags;
 102
 103         so = (struct socket *)fp->f_data;
 104
 105         if (fflags & O_FBLOCKING)
 106                 msgflags = 0;
 107         else if (fflags & O_FNONBLOCKING)
 108                 msgflags = MSG_FNONBLOCKING;
 109         else if (fp->f_flag & FNONBLOCK)
 110                 msgflags = MSG_FNONBLOCKING;
 111         else
 112                 msgflags = 0;
 113
 114         error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
 115         if (error == EPIPE && !(fflags & MSG_NOSIGNAL) &&
 116             !(so->so_options & SO_NOSIGPIPE) &&
 117             uio->uio_td->td_lwp) {
 118                 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE);
 119         }
 120         return (error);
 121 }
 122
 123 /*
 124  * MPSAFE
 125  */
 126 int
 127 soo_ioctl(struct file *fp, u_long cmd, caddr_t data,
 128           struct ucred *cred, struct sysmsg *msg)
 129 {
 130         struct socket *so;
 131         int error;
 132
 133         so = (struct socket *)fp->f_data;
 134
 135         switch (cmd) {
 136         case FIONBIO:
 137                 error = 0;
 138                 break;
 139         case FIOASYNC:
 140                 if (*(int *)data) {
 141                         sosetstate(so, SS_ASYNC);
 142                         atomic_set_int(&so->so_rcv.ssb_flags,  SSB_ASYNC);
 143                         atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC);
 144                 } else {
 145                         soclrstate(so, SS_ASYNC);
 146                         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC);
 147                         atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC);
 148                 }
 149                 error = 0;
 150                 break;
 151         case FIONREAD:
 152                 *(int *)data = so->so_rcv.ssb_cc;
 153                 error = 0;
 154                 break;
 155         case FIOSETOWN:
 156                 error = fsetown(*(int *)data, &so->so_sigio);
 157                 break;
 158         case FIOGETOWN:
 159                 *(int *)data = fgetown(&so->so_sigio);
 160                 error = 0;
 161                 break;
 162         case SIOCSPGRP:
 163                 error = fsetown(-(*(int *)data), &so->so_sigio);
 164                 break;
 165         case SIOCGPGRP:
 166                 *(int *)data = -fgetown(&so->so_sigio);
 167                 error = 0;
 168                 break;
 169         case SIOCATMARK:
 170                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
 171                 error = 0;
 172                 break;
 173         default:
 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                         error = ifioctl(so, cmd, data, cred);
 181                 } else if (IOCGROUP(cmd) == 'r') {
 182                         error = rtioctl(cmd, data, cred);
 183                 } else {
 184                         error = so_pru_control_direct(so, cmd, data, NULL);
 185                 }
 186                 break;
 187         }
 188         return (error);
 189 }
 190
 191 /*
 192  * MPSAFE
 193  */
 194 int
 195 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
 196 {
 197         struct socket *so;
 198         int error;
 199
 200         bzero((caddr_t)ub, sizeof (*ub));
 201         ub->st_mode = S_IFSOCK;
 202         so = (struct socket *)fp->f_data;
 203
 204         /*
 205          * If SS_CANTRCVMORE is set, but there's still data left in the
 206          * receive buffer, the socket is still readable.
 207          */
 208         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
 209             so->so_rcv.ssb_cc != 0)
 210                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
 211         if ((so->so_state & SS_CANTSENDMORE) == 0)
 212                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
 213         ub->st_size = so->so_rcv.ssb_cc;
 214         ub->st_uid = so->so_cred->cr_uid;
 215         ub->st_gid = so->so_cred->cr_gid;
 216         error = so_pru_sense(so, ub);
 217         return (error);
 218 }
 219
 220 /*
 221  * MPSAFE
 222  */
 223 int
 224 soo_close(struct file *fp)
 225 {
 226         int error;
 227
 228         fp->f_ops = &badfileops;
 229         if (fp->f_data)
 230                 error = soclose((struct socket *)fp->f_data, fp->f_flag);
 231         else
 232                 error = 0;
 233         fp->f_data = NULL;
 234         return (error);
 235 }
 236
 237 /*
 238  * MPSAFE
 239  */
 240 int
 241 soo_shutdown(struct file *fp, int how)
 242 {
 243         int error;
 244
 245         if (fp->f_data)
 246                 error = soshutdown((struct socket *)fp->f_data, how);
 247         else
 248                 error = 0;
 249         return (error);
 250 }
 251