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 1.8 2005/07/13 01:38:50 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/file.h>
  41 #include <sys/protosw.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/socketops.h>
  45 #include <sys/filio.h>                  /* XXX */
  46 #include <sys/sockio.h>
  47 #include <sys/stat.h>
  48 #include <sys/uio.h>
  49 #include <sys/filedesc.h>
  50 #include <sys/ucred.h>
  51
  52 #include <net/if.h>
  53 #include <net/route.h>
  54
  55 struct  fileops socketops = {
  56         NULL,   /* port */
  57         NULL,   /* clone */
  58         soo_read, soo_write, soo_ioctl, soo_poll, sokqfilter,
  59         soo_stat, soo_close, soo_shutdown
  60 };
  61
  62 /* ARGSUSED */
  63 int
  64 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags,
  65     struct thread *td)
  66 {
  67         struct socket *so = (struct socket *)fp->f_data;
  68
  69         return (so_pru_soreceive(so, NULL, uio, NULL, NULL, NULL));
  70 }
  71
  72 /* ARGSUSED */
  73 int
  74 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags,
  75     struct thread *td)
  76 {
  77         struct socket *so = (struct socket *)fp->f_data;
  78
  79         return (so_pru_sosend(so, NULL, uio, NULL, NULL, 0, uio->uio_td));
  80 }
  81
  82 int
  83 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct thread *td)
  84 {
  85         struct socket *so = (struct socket *)fp->f_data;
  86
  87         switch (cmd) {
  88
  89         case FIONBIO:
  90                 if (*(int *)data)
  91                         so->so_state |= SS_NBIO;
  92                 else
  93                         so->so_state &= ~SS_NBIO;
  94                 return (0);
  95
  96         case FIOASYNC:
  97                 if (*(int *)data) {
  98                         so->so_state |= SS_ASYNC;
  99                         so->so_rcv.sb_flags |= SB_ASYNC;
 100                         so->so_snd.sb_flags |= SB_ASYNC;
 101                 } else {
 102                         so->so_state &= ~SS_ASYNC;
 103                         so->so_rcv.sb_flags &= ~SB_ASYNC;
 104                         so->so_snd.sb_flags &= ~SB_ASYNC;
 105                 }
 106                 return (0);
 107
 108         case FIONREAD:
 109                 *(int *)data = so->so_rcv.sb_cc;
 110                 return (0);
 111
 112         case FIOSETOWN:
 113                 return (fsetown(*(int *)data, &so->so_sigio));
 114
 115         case FIOGETOWN:
 116                 *(int *)data = fgetown(so->so_sigio);
 117                 return (0);
 118
 119         case SIOCSPGRP:
 120                 return (fsetown(-(*(int *)data), &so->so_sigio));
 121
 122         case SIOCGPGRP:
 123                 *(int *)data = -fgetown(so->so_sigio);
 124                 return (0);
 125
 126         case SIOCATMARK:
 127                 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
 128                 return (0);
 129         }
 130         /*
 131          * Interface/routing/protocol specific ioctls:
 132          * interface and routing ioctls should have a
 133          * different entry since a socket's unnecessary
 134          */
 135         if (IOCGROUP(cmd) == 'i')
 136                 return (ifioctl(so, cmd, data, td));
 137         if (IOCGROUP(cmd) == 'r')
 138                 return (rtioctl(cmd, data, td));
 139         return (so_pru_control(so, cmd, data, NULL, td));
 140 }
 141
 142 int
 143 soo_poll(struct file *fp, int events, struct ucred *cred, struct thread *td)
 144 {
 145         struct socket *so = (struct socket *)fp->f_data;
 146         return (so_pru_sopoll(so, events, cred, td));
 147 }
 148
 149 int
 150 soo_stat(struct file *fp, struct stat *ub, struct thread *td)
 151 {
 152         struct socket *so = (struct socket *)fp->f_data;
 153
 154         bzero((caddr_t)ub, sizeof (*ub));
 155         ub->st_mode = S_IFSOCK;
 156         /*
 157          * If SS_CANTRCVMORE is set, but there's still data left in the
 158          * receive buffer, the socket is still readable.
 159          */
 160         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
 161             so->so_rcv.sb_cc != 0)
 162                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
 163         if ((so->so_state & SS_CANTSENDMORE) == 0)
 164                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
 165         ub->st_size = so->so_rcv.sb_cc;
 166         ub->st_uid = so->so_cred->cr_uid;
 167         ub->st_gid = so->so_cred->cr_gid;
 168         return (so_pru_sense(so, ub));
 169 }
 170
 171 /* ARGSUSED */
 172 int
 173 soo_close(struct file *fp, struct thread *td)
 174 {
 175         int error = 0;
 176
 177         fp->f_ops = &badfileops;
 178         if (fp->f_data)
 179                 error = soclose((struct socket *)fp->f_data);
 180         fp->f_data = 0;
 181         return (error);
 182 }
 183
 184 /* ARGSUSED */
 185 int
 186 soo_shutdown(struct file *fp, int how, struct thread *td)
 187 {
 188         int error = 0;
 189
 190         if (fp->f_data)
 191                 error = soshutdown((struct socket *)fp->f_data, how);
 192         return (error);
 193 }
 194