sys_socket.c revision 127911
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 * 4. 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 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/kern/sys_socket.c 127911 2004-04-05 21:03:37Z imp $"); 34 35#include "opt_mac.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/file.h> 40#include <sys/filedesc.h> 41#include <sys/mac.h> 42#include <sys/protosw.h> 43#include <sys/sigio.h> 44#include <sys/socket.h> 45#include <sys/socketvar.h> 46#include <sys/filio.h> /* XXX */ 47#include <sys/sockio.h> 48#include <sys/stat.h> 49#include <sys/uio.h> 50#include <sys/ucred.h> 51 52#include <net/if.h> 53#include <net/route.h> 54 55struct fileops socketops = { 56 .fo_read = soo_read, 57 .fo_write = soo_write, 58 .fo_ioctl = soo_ioctl, 59 .fo_poll = soo_poll, 60 .fo_kqfilter = soo_kqfilter, 61 .fo_stat = soo_stat, 62 .fo_close = soo_close, 63 .fo_flags = DFLAG_PASSABLE 64}; 65 66/* ARGSUSED */ 67int 68soo_read(fp, uio, active_cred, flags, td) 69 struct file *fp; 70 struct uio *uio; 71 struct ucred *active_cred; 72 struct thread *td; 73 int flags; 74{ 75 struct socket *so = fp->f_data; 76 int error; 77 78 NET_LOCK_GIANT(); 79#ifdef MAC 80 error = mac_check_socket_receive(active_cred, so); 81 if (error) { 82 NET_UNLOCK_GIANT(); 83 return (error); 84 } 85#endif 86 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 87 NET_UNLOCK_GIANT(); 88 return (error); 89} 90 91/* ARGSUSED */ 92int 93soo_write(fp, uio, active_cred, flags, td) 94 struct file *fp; 95 struct uio *uio; 96 struct ucred *active_cred; 97 struct thread *td; 98 int flags; 99{ 100 struct socket *so = fp->f_data; 101 int error; 102 103 NET_LOCK_GIANT(); 104#ifdef MAC 105 error = mac_check_socket_send(active_cred, so); 106 if (error) { 107 NET_UNLOCK_GIANT(); 108 return (error); 109 } 110#endif 111 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 112 uio->uio_td); 113 NET_UNLOCK_GIANT(); 114 return (error); 115} 116 117int 118soo_ioctl(fp, cmd, data, active_cred, td) 119 struct file *fp; 120 u_long cmd; 121 void *data; 122 struct ucred *active_cred; 123 struct thread *td; 124{ 125 register struct socket *so = fp->f_data; 126 127 switch (cmd) { 128 129 case FIONBIO: 130 if (*(int *)data) 131 so->so_state |= SS_NBIO; 132 else 133 so->so_state &= ~SS_NBIO; 134 return (0); 135 136 case FIOASYNC: 137 if (*(int *)data) { 138 so->so_state |= SS_ASYNC; 139 so->so_rcv.sb_flags |= SB_ASYNC; 140 so->so_snd.sb_flags |= SB_ASYNC; 141 } else { 142 so->so_state &= ~SS_ASYNC; 143 so->so_rcv.sb_flags &= ~SB_ASYNC; 144 so->so_snd.sb_flags &= ~SB_ASYNC; 145 } 146 return (0); 147 148 case FIONREAD: 149 *(int *)data = so->so_rcv.sb_cc; 150 return (0); 151 152 case FIOSETOWN: 153 return (fsetown(*(int *)data, &so->so_sigio)); 154 155 case FIOGETOWN: 156 *(int *)data = fgetown(&so->so_sigio); 157 return (0); 158 159 case SIOCSPGRP: 160 return (fsetown(-(*(int *)data), &so->so_sigio)); 161 162 case SIOCGPGRP: 163 *(int *)data = -fgetown(&so->so_sigio); 164 return (0); 165 166 case SIOCATMARK: 167 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 168 return (0); 169 } 170 /* 171 * Interface/routing/protocol specific ioctls: 172 * interface and routing ioctls should have a 173 * different entry since a socket's unnecessary 174 */ 175 if (IOCGROUP(cmd) == 'i') 176 return (ifioctl(so, cmd, data, td)); 177 if (IOCGROUP(cmd) == 'r') 178 return (rtioctl(cmd, data)); 179 return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td)); 180} 181 182int 183soo_poll(fp, events, active_cred, td) 184 struct file *fp; 185 int events; 186 struct ucred *active_cred; 187 struct thread *td; 188{ 189 struct socket *so = fp->f_data; 190 return so->so_proto->pr_usrreqs->pru_sopoll(so, events, 191 fp->f_cred, td); 192} 193 194int 195soo_stat(fp, ub, active_cred, td) 196 struct file *fp; 197 struct stat *ub; 198 struct ucred *active_cred; 199 struct thread *td; 200{ 201 struct socket *so = fp->f_data; 202 203 bzero((caddr_t)ub, sizeof (*ub)); 204 ub->st_mode = S_IFSOCK; 205 /* 206 * If SS_CANTRCVMORE is set, but there's still data left in the 207 * receive buffer, the socket is still readable. 208 */ 209 if ((so->so_state & SS_CANTRCVMORE) == 0 || 210 so->so_rcv.sb_cc != 0) 211 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 212 if ((so->so_state & SS_CANTSENDMORE) == 0) 213 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 214 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 215 ub->st_uid = so->so_cred->cr_uid; 216 ub->st_gid = so->so_cred->cr_gid; 217 return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub)); 218} 219 220/* 221 * API socket close on file pointer. We call soclose() to close the 222 * socket (including initiating closing protocols). soclose() will 223 * sorele() the file reference but the actual socket will not go away 224 * until the socket's ref count hits 0. 225 */ 226/* ARGSUSED */ 227int 228soo_close(fp, td) 229 struct file *fp; 230 struct thread *td; 231{ 232 int error = 0; 233 struct socket *so; 234 235 so = fp->f_data; 236 fp->f_ops = &badfileops; 237 fp->f_data = NULL; 238 239 if (so) 240 error = soclose(so); 241 return (error); 242} 243