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/route.h>
  54
  55 struct  fileops socketops = {
  56         .fo_read = soo_read,
  57         .fo_write = soo_write,
  58         .fo_ioctl = soo_ioctl,
  59         .fo_kqfilter = sokqfilter,
  60         .fo_stat = soo_stat,
  61         .fo_close = soo_close,
  62         .fo_shutdown = soo_shutdown
  63 };
  64
  65 /*
  66  * MPSAFE
  67  */
  68 int
  69 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  70 {
  71         struct socket *so;
  72         int error;
  73         int msgflags;
  74
  75         atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC);
  76
  77         so = (struct socket *)fp->f_data;
  78
  79         if (fflags & O_FBLOCKING)
  80                 msgflags = 0;
  81         else if (fflags & O_FNONBLOCKING)
  82                 msgflags = MSG_FNONBLOCKING;
  83         else if (fp->f_flag & FNONBLOCK)
  84                 msgflags = MSG_FNONBLOCKING;
  85         else
  86                 msgflags = 0;
  87
  88         error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags);
  89         return (error);
  90 }
  91
  92 /*
  93  * MPSAFE
  94  */
  95 int
  96 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags)
  97 {
  98         struct socket *so;
  99         int error;
 100         int msgflags;
 101
 102         so = (struct socket *)fp->f_data;
 103
 104         if (fflags & O_FBLOCKING)
 105                 msgflags = 0;
 106         else if (fflags & O_FNONBLOCKING)
 107                 msgflags = MSG_FNONBLOCKING;
 108         else if (fp->f_flag & FNONBLOCK)
 109                 msgflags = MSG_FNONBLOCKING;
 110         else
 111                 msgflags = 0;
 112
 113         error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td);
 114         if (error == EPIPE && !(fflags & MSG_NOSIGNAL) &&
 115             !(so->so_options & SO_NOSIGPIPE) &&
 116             uio->uio_td->td_lwp) {
 117                 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE);
 118         }
 119         return (error);
 120 }
 121
 122 /*
 123  * MPSAFE
 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         so = (struct socket *)fp->f_data;
 133
 134         switch (cmd) {
 135         case FIONBIO:
 136                 error = 0;
 137                 break;
 138         case FIOASYNC:
 139                 if (*(int *)data) {
 140                         sosetstate(so, SS_ASYNC);
 141                         atomic_set_int(&so->so_rcv.ssb_flags,  SSB_ASYNC);
 142                         atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC);
 143                 } else {
 144                         soclrstate(so, SS_ASYNC);
 145                         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC);
 146                         atomic_clear_int(&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_direct(so, cmd, data, NULL);
 184                 }
 185                 break;
 186         }
 187         return (error);
 188 }
 189
 190 /*
 191  * MPSAFE
 192  */
 193 int
 194 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred)
 195 {
 196         struct socket *so;
 197         int error;
 198
 199         bzero((caddr_t)ub, sizeof (*ub));
 200         ub->st_mode = S_IFSOCK;
 201         so = (struct socket *)fp->f_data;
 202
 203         /*
 204          * If SS_CANTRCVMORE is set, but there's still data left in the
 205          * receive buffer, the socket is still readable.
 206          */
 207         if ((so->so_state & SS_CANTRCVMORE) == 0 ||
 208             so->so_rcv.ssb_cc != 0)
 209                 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
 210         if ((so->so_state & SS_CANTSENDMORE) == 0)
 211                 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
 212         ub->st_size = so->so_rcv.ssb_cc;
 213         ub->st_uid = so->so_cred->cr_uid;
 214         ub->st_gid = so->so_cred->cr_gid;
 215         error = so_pru_sense(so, ub);
 216         return (error);
 217 }
 218
 219 /*
 220  * MPSAFE
 221  */
 222 int
 223 soo_close(struct file *fp)
 224 {
 225         int error;
 226
 227         fp->f_ops = &badfileops;
 228         if (fp->f_data)
 229                 error = soclose((struct socket *)fp->f_data, fp->f_flag);
 230         else
 231                 error = 0;
 232         fp->f_data = NULL;
 233         return (error);
 234 }
 235
 236 /*
 237  * MPSAFE
 238  */
 239 int
 240 soo_shutdown(struct file *fp, int how)
 241 {
 242         int error;
 243
 244         if (fp->f_data)
 245                 error = soshutdown((struct socket *)fp->f_data, how);
 246         else
 247                 error = 0;
 248         return (error);
 249 }
 250