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. 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: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $
  35  * $DragonFly: src/sys/kern/sys_socket.c,v 1.14 2007/04/22 01:13:10 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/file.h>
  41 #include <sys/lock.h>
  42 #include <sys/protosw.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45 #include <sys/socketops.h>
  46 #include <sys/filio.h>                  /* XXX */
  47 #include <sys/sockio.h>
  48 #include <sys/vnode.h>
  49 #include <sys/stat.h>
  50 #include <sys/uio.h>
  51 #include <sys/filedesc.h>
  52 #include <sys/ucred.h>
  53
  54 #include <net/if.h>
  55 #include <net/route.h>
  56
  57 struct  fileops socketops = {
  58         .fo_read = soo_read,
  59         .fo_write = soo_write,
  60         .fo_ioctl = soo_ioctl,
  61         .fo_poll = soo_poll,
  62         .fo_kqfilter = sokqfilter,
  63         .fo_stat = soo_stat,
  64         .fo_close = soo_close,
  65         .fo_shutdown = soo_shutdown
  66 };
  67
  68 /*
  69  * MPALMOSTSAFE - acquires mplock
  70  */
  71 int
  72 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  73 {
  74         struct socket *so;
  75         int error;
  76         int msgflags;
  77
  78         get_mplock();
  79         so = (struct socket *)fp->f_data;
  80
  81         if (fflags & O_FBLOCKING)
  82                 msgflags = 0;
  83         else if (fflags & O_FNONBLOCKING)
  84                 msgflags = MSG_FNONBLOCKING;
  85         else if (fp->f_flag & FNONBLOCK)
  86                 msgflags = MSG_FNONBLOCKING;
  87         else
  88                 msgflags = 0;
  89
  90         error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
  91         rel_mplock();
  92         return (error);
  93 }
  94
  95 /*
  96  * MPALMOSTSAFE - acquires mplock
  97  */
  98 int
  99 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
 100 {
 101         struct socket *so;
 102         int error;
 103         int msgflags;
 104
 105         get_mplock();
 106         so = (struct socket *)fp->f_data;
 107
 108         if (fflags & O_FBLOCKING)
 109                 msgflags = 0;
 110         else if (fflags & O_FNONBLOCKING)
 111                 msgflags = MSG_FNONBLOCKING;
 112         else if (fp->f_flag & FNONBLOCK)
 113                 msgflags = MSG_FNONBLOCKING;
 114         else
 115                 msgflags = 0;
 116
 117         error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
 118         rel_mplock();
 119         return (error);
 120 }
 121
 122 /*
 123  * MPALMOSTSAFE - acquires mplock
 124  */
 125 int
 126 soo_ioctl(struct file *fp, u_long cmd, caddr_t data,
 127           struct ucred *cred, struct sysmsg *msg)
 128 {
 129         struct socket *so;
 130         int error;
 131
 132         get_mplock();
 133         so = (struct socket *)fp->f_data;
 134
 135         switch (cmd) {
 136         case FIOASYNC:
 137                 if (*(int *)data) {
 138                         so->so_state |= SS_ASYNC;
 139                         so->so_rcv.ssb_flags |= SSB_ASYNC;
 140                         so->so_snd.ssb_flags |= SSB_ASYNC;
 141                 } else {
 142                         so->so_state &= ~SS_ASYNC;
 143                         so->so_rcv.ssb_flags &= ~SSB_ASYNC;
 144                         so->so_snd.ssb_flags &= ~SSB_ASYNC;
 145                 }
 146                 error = 0;
 147                 break;
 148         case FIONREAD:
 149                 *(int *)data = so->so_rcv.ssb_cc;
 150                 error = 0;
 151                 break;
 152         case FIOSETOWN:
 153                 error = fsetown(*(int *)data, &so->so_sigio);
 154                 break;
 155         case FIOGETOWN:
 156                 *(int *)data = fgetown(so->so_sigio);
 157                 error = 0;
 158                 break;
 159         case SIOCSPGRP:
 160                 error = fsetown(-(*(int *)data), &so->so_sigio);
 161                 break;
 162         case SIOCGPGRP:
 163                 *(int *)data = -fgetown(so->so_sigio);
 164                 error = 0;
 165                 break;
 166         case SIOCATMARK:
 167                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
 168                 error = 0;
 169                 break;
 170         default:
 171                 /*
 172                  * Interface/routing/protocol specific ioctls:
 173                  * interface and routing ioctls should have a
 174                  * different entry since a socket's unnecessary
 175                  */
 176                 if (IOCGROUP(cmd) == 'i')
 177                         error = ifioctl(so, cmd, data, cred);
 178                 else if (IOCGROUP(cmd) == 'r')
 179                         error = rtioctl(cmd, data, cred);
 180                 else
 181                         error = so_pru_control(so, cmd, data, NULL);
 182                 break;
 183         }
 184         rel_mplock();
 185         return (error);
 186 }
 187
 188 /*
 189  * MPALMOSTSAFE - acquires mplock
 190  */
 191 int
 192 soo_poll(struct file *fp, int events, struct ucred *cred)
 193 {
 194         struct socket *so;
 195         int error;
 196
 197         get_mplock();
 198         so = (struct socket *)fp->f_data;
 199         error = so_pru_sopoll(so, events, cred);
 200         rel_mplock();
 201         return (error);
 202 }
 203
 204 /*
 205  * MPSAFE - acquires mplock
 206  */
 207 int
 208 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
 209 {
 210         struct socket *so;
 211         int error;
 212
 213         bzero((caddr_t)ub, sizeof (*ub));
 214         ub->st_mode = S_IFSOCK;
 215         so = (struct socket *)fp->f_data;
 216
 217         /*
 218          * If SS_CANTRCVMORE is set, but there's still data left in the
 219          * receive buffer, the socket is still readable.
 220          */
 221         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
 222             so->so_rcv.ssb_cc != 0)
 223                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
 224         if ((so->so_state & SS_CANTSENDMORE) == 0)
 225                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
 226         ub->st_size = so->so_rcv.ssb_cc;
 227         ub->st_uid = so->so_cred->cr_uid;
 228         ub->st_gid = so->so_cred->cr_gid;
 229         error = so_pru_sense(so, ub);
 230         return (error);
 231 }
 232
 233 /*
 234  * MPALMOSTSAFE - acquires mplock
 235  */
 236 int
 237 soo_close(struct file *fp)
 238 {
 239         int error;
 240
 241         get_mplock();
 242         fp->f_ops = &badfileops;
 243         if (fp->f_data)
 244                 error = soclose((struct socket *)fp->f_data, fp->f_flag);
 245         else
 246                 error = 0;
 247         fp->f_data = NULL;
 248         rel_mplock();
 249         return (error);
 250 }
 251
 252 /*
 253  * MPALMOSTSAFE - acquires mplock
 254  */
 255 int
 256 soo_shutdown(struct file *fp, int how)
 257 {
 258         int error;
 259
 260         get_mplock();
 261         if (fp->f_data)
 262                 error = soshutdown((struct socket *)fp->f_data, how);
 263         else
 264                 error = 0;
 265         rel_mplock();
 266         return (error);
 267 }
 268