sys_socket.c revision 163606
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 163606 2006-10-22 11:52:19Z rwatson $"); 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/proc.h> 42#include <sys/protosw.h> 43#include <sys/sigio.h> 44#include <sys/signal.h> 45#include <sys/signalvar.h> 46#include <sys/socket.h> 47#include <sys/socketvar.h> 48#include <sys/filio.h> /* XXX */ 49#include <sys/sockio.h> 50#include <sys/stat.h> 51#include <sys/uio.h> 52#include <sys/ucred.h> 53 54#include <net/if.h> 55#include <net/route.h> 56 57#include <security/mac/mac_framework.h> 58 59struct 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 = soo_kqfilter, 65 .fo_stat = soo_stat, 66 .fo_close = soo_close, 67 .fo_flags = DFLAG_PASSABLE 68}; 69 70/* ARGSUSED */ 71int 72soo_read(fp, uio, active_cred, flags, td) 73 struct file *fp; 74 struct uio *uio; 75 struct ucred *active_cred; 76 struct thread *td; 77 int flags; 78{ 79 struct socket *so = fp->f_data; 80 int error; 81 82 NET_LOCK_GIANT(); 83#ifdef MAC 84 SOCK_LOCK(so); 85 error = mac_check_socket_receive(active_cred, so); 86 SOCK_UNLOCK(so); 87 if (error) { 88 NET_UNLOCK_GIANT(); 89 return (error); 90 } 91#endif 92 error = soreceive(so, 0, uio, 0, 0, 0); 93 NET_UNLOCK_GIANT(); 94 return (error); 95} 96 97/* ARGSUSED */ 98int 99soo_write(fp, uio, active_cred, flags, td) 100 struct file *fp; 101 struct uio *uio; 102 struct ucred *active_cred; 103 struct thread *td; 104 int flags; 105{ 106 struct socket *so = fp->f_data; 107 int error; 108 109 NET_LOCK_GIANT(); 110#ifdef MAC 111 SOCK_LOCK(so); 112 error = mac_check_socket_send(active_cred, so); 113 SOCK_UNLOCK(so); 114 if (error) { 115 NET_UNLOCK_GIANT(); 116 return (error); 117 } 118#endif 119 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 120 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 121 PROC_LOCK(uio->uio_td->td_proc); 122 psignal(uio->uio_td->td_proc, SIGPIPE); 123 PROC_UNLOCK(uio->uio_td->td_proc); 124 } 125 NET_UNLOCK_GIANT(); 126 return (error); 127} 128 129int 130soo_ioctl(fp, cmd, data, active_cred, td) 131 struct file *fp; 132 u_long cmd; 133 void *data; 134 struct ucred *active_cred; 135 struct thread *td; 136{ 137 struct socket *so = fp->f_data; 138 int error = 0; 139 140 NET_LOCK_GIANT(); 141 switch (cmd) { 142 143 case FIONBIO: 144 SOCK_LOCK(so); 145 if (*(int *)data) 146 so->so_state |= SS_NBIO; 147 else 148 so->so_state &= ~SS_NBIO; 149 SOCK_UNLOCK(so); 150 break; 151 152 case FIOASYNC: 153 /* 154 * XXXRW: This code separately acquires SOCK_LOCK(so) 155 * and SOCKBUF_LOCK(&so->so_rcv) even though they are 156 * the same mutex to avoid introducing the assumption 157 * that they are the same. 158 */ 159 if (*(int *)data) { 160 SOCK_LOCK(so); 161 so->so_state |= SS_ASYNC; 162 SOCK_UNLOCK(so); 163 SOCKBUF_LOCK(&so->so_rcv); 164 so->so_rcv.sb_flags |= SB_ASYNC; 165 SOCKBUF_UNLOCK(&so->so_rcv); 166 SOCKBUF_LOCK(&so->so_snd); 167 so->so_snd.sb_flags |= SB_ASYNC; 168 SOCKBUF_UNLOCK(&so->so_snd); 169 } else { 170 SOCK_LOCK(so); 171 so->so_state &= ~SS_ASYNC; 172 SOCK_UNLOCK(so); 173 SOCKBUF_LOCK(&so->so_rcv); 174 so->so_rcv.sb_flags &= ~SB_ASYNC; 175 SOCKBUF_UNLOCK(&so->so_rcv); 176 SOCKBUF_LOCK(&so->so_snd); 177 so->so_snd.sb_flags &= ~SB_ASYNC; 178 SOCKBUF_UNLOCK(&so->so_snd); 179 } 180 break; 181 182 case FIONREAD: 183 /* Unlocked read. */ 184 *(int *)data = so->so_rcv.sb_cc; 185 break; 186 187 case FIOSETOWN: 188 error = fsetown(*(int *)data, &so->so_sigio); 189 break; 190 191 case FIOGETOWN: 192 *(int *)data = fgetown(&so->so_sigio); 193 break; 194 195 case SIOCSPGRP: 196 error = fsetown(-(*(int *)data), &so->so_sigio); 197 break; 198 199 case SIOCGPGRP: 200 *(int *)data = -fgetown(&so->so_sigio); 201 break; 202 203 case SIOCATMARK: 204 /* Unlocked read. */ 205 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 206 break; 207 default: 208 /* 209 * Interface/routing/protocol specific ioctls: 210 * interface and routing ioctls should have a 211 * different entry since a socket's unnecessary 212 */ 213 if (IOCGROUP(cmd) == 'i') 214 error = ifioctl(so, cmd, data, td); 215 else if (IOCGROUP(cmd) == 'r') 216 error = rtioctl(cmd, data); 217 else 218 error = ((*so->so_proto->pr_usrreqs->pru_control) 219 (so, cmd, data, 0, td)); 220 break; 221 } 222 NET_UNLOCK_GIANT(); 223 return(error); 224} 225 226int 227soo_poll(fp, events, active_cred, td) 228 struct file *fp; 229 int events; 230 struct ucred *active_cred; 231 struct thread *td; 232{ 233 struct socket *so = fp->f_data; 234 int error; 235 236 NET_LOCK_GIANT(); 237#ifdef MAC 238 SOCK_LOCK(so); 239 error = mac_check_socket_poll(active_cred, so); 240 SOCK_UNLOCK(so); 241 if (error) { 242 NET_UNLOCK_GIANT(); 243 return (error); 244 } 245#endif 246 error = sopoll(so, events, fp->f_cred, td); 247 NET_UNLOCK_GIANT(); 248 249 return (error); 250} 251 252int 253soo_stat(fp, ub, active_cred, td) 254 struct file *fp; 255 struct stat *ub; 256 struct ucred *active_cred; 257 struct thread *td; 258{ 259 struct socket *so = fp->f_data; 260 int error; 261 262 bzero((caddr_t)ub, sizeof (*ub)); 263 ub->st_mode = S_IFSOCK; 264 NET_LOCK_GIANT(); 265#ifdef MAC 266 SOCK_LOCK(so); 267 error = mac_check_socket_stat(active_cred, so); 268 SOCK_UNLOCK(so); 269 if (error) { 270 NET_UNLOCK_GIANT(); 271 return (error); 272 } 273#endif 274 /* 275 * If SBS_CANTRCVMORE is set, but there's still data left in the 276 * receive buffer, the socket is still readable. 277 * 278 * XXXRW: perhaps should lock socket buffer so st_size result 279 * is consistent. 280 */ 281 /* Unlocked read. */ 282 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 283 so->so_rcv.sb_cc != 0) 284 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 285 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 286 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 287 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 288 ub->st_uid = so->so_cred->cr_uid; 289 ub->st_gid = so->so_cred->cr_gid; 290 error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 291 NET_UNLOCK_GIANT(); 292 return (error); 293} 294 295/* 296 * API socket close on file pointer. We call soclose() to close the 297 * socket (including initiating closing protocols). soclose() will 298 * sorele() the file reference but the actual socket will not go away 299 * until the socket's ref count hits 0. 300 */ 301/* ARGSUSED */ 302int 303soo_close(fp, td) 304 struct file *fp; 305 struct thread *td; 306{ 307 int error = 0; 308 struct socket *so; 309 310 NET_LOCK_GIANT(); 311 so = fp->f_data; 312 fp->f_ops = &badfileops; 313 fp->f_data = NULL; 314 315 if (so) 316 error = soclose(so); 317 NET_UNLOCK_GIANT(); 318 return (error); 319} 320