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 <sys/mplock2.h>
  55
  56 #include <net/if.h>
  57 #include <net/route.h>
  58
  59 struct  fileops socketops = {
  60         .fo_read = soo_read,
  61         .fo_write = soo_write,
  62         .fo_ioctl = soo_ioctl,
  63         .fo_poll = soo_poll,
  64         .fo_kqfilter = sokqfilter,
  65         .fo_stat = soo_stat,
  66         .fo_close = soo_close,
  67         .fo_shutdown = soo_shutdown
  68 };
  69
  70 /*
  71  * MPALMOSTSAFE - acquires mplock
  72  */
  73 int
  74 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  75 {
  76         struct socket *so;
  77         int error;
  78         int msgflags;
  79
  80         get_mplock();
  81         so = (struct socket *)fp->f_data;
  82
  83         if (fflags & O_FBLOCKING)
  84                 msgflags = 0;
  85         else if (fflags & O_FNONBLOCKING)
  86                 msgflags = MSG_FNONBLOCKING;
  87         else if (fp->f_flag & FNONBLOCK)
  88                 msgflags = MSG_FNONBLOCKING;
  89         else
  90                 msgflags = 0;
  91
  92         error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
  93         rel_mplock();
  94         return (error);
  95 }
  96
  97 /*
  98  * MPALMOSTSAFE - acquires mplock
  99  */
 100 int
 101 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
 102 {
 103         struct socket *so;
 104         int error;
 105         int msgflags;
 106
 107         get_mplock();
 108         so = (struct socket *)fp->f_data;
 109
 110         if (fflags & O_FBLOCKING)
 111                 msgflags = 0;
 112         else if (fflags & O_FNONBLOCKING)
 113                 msgflags = MSG_FNONBLOCKING;
 114         else if (fp->f_flag & FNONBLOCK)
 115                 msgflags = MSG_FNONBLOCKING;
 116         else
 117                 msgflags = 0;
 118
 119         error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
 120         rel_mplock();
 121         return (error);
 122 }
 123
 124 /*
 125  * MPALMOSTSAFE - acquires mplock
 126  */
 127 int
 128 soo_ioctl(struct file *fp, u_long cmd, caddr_t data,
 129           struct ucred *cred, struct sysmsg *msg)
 130 {
 131         struct socket *so;
 132         int error;
 133
 134         get_mplock();
 135         so = (struct socket *)fp->f_data;
 136
 137         switch (cmd) {
 138         case FIOASYNC:
 139                 if (*(int *)data) {
 140                         so->so_state |= SS_ASYNC;
 141                         so->so_rcv.ssb_flags |= SSB_ASYNC;
 142                         so->so_snd.ssb_flags |= SSB_ASYNC;
 143                 } else {
 144                         so->so_state &= ~SS_ASYNC;
 145                         so->so_rcv.ssb_flags &= ~SSB_ASYNC;
 146                         so->so_snd.ssb_flags &= ~SSB_ASYNC;
 147                 }
 148                 error = 0;
 149                 break;
 150         case FIONREAD:
 151                 *(int *)data = so->so_rcv.ssb_cc;
 152                 error = 0;
 153                 break;
 154         case FIOSETOWN:
 155                 error = fsetown(*(int *)data, &so->so_sigio);
 156                 break;
 157         case FIOGETOWN:
 158                 *(int *)data = fgetown(so->so_sigio);
 159                 error = 0;
 160                 break;
 161         case SIOCSPGRP:
 162                 error = fsetown(-(*(int *)data), &so->so_sigio);
 163                 break;
 164         case SIOCGPGRP:
 165                 *(int *)data = -fgetown(so->so_sigio);
 166                 error = 0;
 167                 break;
 168         case SIOCATMARK:
 169                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
 170                 error = 0;
 171                 break;
 172         default:
 173                 /*
 174                  * Interface/routing/protocol specific ioctls:
 175                  * interface and routing ioctls should have a
 176                  * different entry since a socket's unnecessary
 177                  */
 178                 if (IOCGROUP(cmd) == 'i')
 179                         error = ifioctl(so, cmd, data, cred);
 180                 else if (IOCGROUP(cmd) == 'r')
 181                         error = rtioctl(cmd, data, cred);
 182                 else
 183                         error = so_pru_control(so, cmd, data, NULL);
 184                 break;
 185         }
 186         rel_mplock();
 187         return (error);
 188 }
 189
 190 /*
 191  * MPALMOSTSAFE - acquires mplock
 192  */
 193 int
 194 soo_poll(struct file *fp, int events, struct ucred *cred)
 195 {
 196         struct socket *so;
 197         int error;
 198
 199         get_mplock();
 200         so = (struct socket *)fp->f_data;
 201         error = so_pru_sopoll(so, events, cred);
 202         rel_mplock();
 203         return (error);
 204 }
 205
 206 /*
 207  * MPSAFE - acquires mplock
 208  */
 209 int
 210 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
 211 {
 212         struct socket *so;
 213         int error;
 214
 215         bzero((caddr_t)ub, sizeof (*ub));
 216         ub->st_mode = S_IFSOCK;
 217         so = (struct socket *)fp->f_data;
 218
 219         /*
 220          * If SS_CANTRCVMORE is set, but there's still data left in the
 221          * receive buffer, the socket is still readable.
 222          */
 223         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
 224             so->so_rcv.ssb_cc != 0)
 225                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
 226         if ((so->so_state & SS_CANTSENDMORE) == 0)
 227                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
 228         ub->st_size = so->so_rcv.ssb_cc;
 229         ub->st_uid = so->so_cred->cr_uid;
 230         ub->st_gid = so->so_cred->cr_gid;
 231         error = so_pru_sense(so, ub);
 232         return (error);
 233 }
 234
 235 /*
 236  * MPALMOSTSAFE - acquires mplock
 237  */
 238 int
 239 soo_close(struct file *fp)
 240 {
 241         int error;
 242
 243         get_mplock();
 244         fp->f_ops = &badfileops;
 245         if (fp->f_data)
 246                 error = soclose((struct socket *)fp->f_data, fp->f_flag);
 247         else
 248                 error = 0;
 249         fp->f_data = NULL;
 250         rel_mplock();
 251         return (error);
 252 }
 253
 254 /*
 255  * MPALMOSTSAFE - acquires mplock
 256  */
 257 int
 258 soo_shutdown(struct file *fp, int how)
 259 {
 260         int error;
 261
 262         get_mplock();
 263         if (fp->f_data)
 264                 error = soshutdown((struct socket *)fp->f_data, how);
 265         else
 266                 error = 0;
 267         rel_mplock();
 268         return (error);
 269 }
 270