sys_socket.c revision 139804
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 139804 2005-01-06 23:35:40Z 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 SOCK_LOCK(so); 81 error = mac_check_socket_receive(active_cred, so); 82 SOCK_UNLOCK(so); 83 if (error) { 84 NET_UNLOCK_GIANT(); 85 return (error); 86 } 87#endif 88 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 89 NET_UNLOCK_GIANT(); 90 return (error); 91} 92 93/* ARGSUSED */ 94int 95soo_write(fp, uio, active_cred, flags, td) 96 struct file *fp; 97 struct uio *uio; 98 struct ucred *active_cred; 99 struct thread *td; 100 int flags; 101{ 102 struct socket *so = fp->f_data; 103 int error; 104 105 NET_LOCK_GIANT(); 106#ifdef MAC 107 SOCK_LOCK(so); 108 error = mac_check_socket_send(active_cred, so); 109 SOCK_UNLOCK(so); 110 if (error) { 111 NET_UNLOCK_GIANT(); 112 return (error); 113 } 114#endif 115 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 116 uio->uio_td); 117 NET_UNLOCK_GIANT(); 118 return (error); 119} 120 121int 122soo_ioctl(fp, cmd, data, active_cred, td) 123 struct file *fp; 124 u_long cmd; 125 void *data; 126 struct ucred *active_cred; 127 struct thread *td; 128{ 129 struct socket *so = fp->f_data; 130 int error = 0; 131 132 NET_LOCK_GIANT(); 133 switch (cmd) { 134 135 case FIONBIO: 136 SOCK_LOCK(so); 137 if (*(int *)data) 138 so->so_state |= SS_NBIO; 139 else 140 so->so_state &= ~SS_NBIO; 141 SOCK_UNLOCK(so); 142 break; 143 144 case FIOASYNC: 145 /* 146 * XXXRW: This code separately acquires SOCK_LOCK(so) 147 * and SOCKBUF_LOCK(&so->so_rcv) even though they are 148 * the same mutex to avoid introducing the assumption 149 * that they are the same. 150 */ 151 if (*(int *)data) { 152 SOCK_LOCK(so); 153 so->so_state |= SS_ASYNC; 154 SOCK_UNLOCK(so); 155 SOCKBUF_LOCK(&so->so_rcv); 156 so->so_rcv.sb_flags |= SB_ASYNC; 157 SOCKBUF_UNLOCK(&so->so_rcv); 158 SOCKBUF_LOCK(&so->so_snd); 159 so->so_snd.sb_flags |= SB_ASYNC; 160 SOCKBUF_UNLOCK(&so->so_snd); 161 } else { 162 SOCK_LOCK(so); 163 so->so_state &= ~SS_ASYNC; 164 SOCK_UNLOCK(so); 165 SOCKBUF_LOCK(&so->so_rcv); 166 so->so_rcv.sb_flags &= ~SB_ASYNC; 167 SOCKBUF_UNLOCK(&so->so_rcv); 168 SOCKBUF_LOCK(&so->so_snd); 169 so->so_snd.sb_flags &= ~SB_ASYNC; 170 SOCKBUF_UNLOCK(&so->so_snd); 171 } 172 break; 173 174 case FIONREAD: 175 /* Unlocked read. */ 176 *(int *)data = so->so_rcv.sb_cc; 177 break; 178 179 case FIOSETOWN: 180 error = fsetown(*(int *)data, &so->so_sigio); 181 break; 182 183 case FIOGETOWN: 184 *(int *)data = fgetown(&so->so_sigio); 185 break; 186 187 case SIOCSPGRP: 188 error = fsetown(-(*(int *)data), &so->so_sigio); 189 break; 190 191 case SIOCGPGRP: 192 *(int *)data = -fgetown(&so->so_sigio); 193 break; 194 195 case SIOCATMARK: 196 /* Unlocked read. */ 197 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 198 break; 199 default: 200 /* 201 * Interface/routing/protocol specific ioctls: 202 * interface and routing ioctls should have a 203 * different entry since a socket's unnecessary 204 */ 205 if (IOCGROUP(cmd) == 'i') 206 error = ifioctl(so, cmd, data, td); 207 else if (IOCGROUP(cmd) == 'r') 208 error = rtioctl(cmd, data); 209 else 210 error = ((*so->so_proto->pr_usrreqs->pru_control) 211 (so, cmd, data, 0, td)); 212 break; 213 } 214 NET_UNLOCK_GIANT(); 215 return(error); 216} 217 218int 219soo_poll(fp, events, active_cred, td) 220 struct file *fp; 221 int events; 222 struct ucred *active_cred; 223 struct thread *td; 224{ 225 struct socket *so = fp->f_data; 226 int error; 227 228 NET_LOCK_GIANT(); 229 error = (so->so_proto->pr_usrreqs->pru_sopoll) 230 (so, events, fp->f_cred, td); 231 NET_UNLOCK_GIANT(); 232 233 return (error); 234} 235 236int 237soo_stat(fp, ub, active_cred, td) 238 struct file *fp; 239 struct stat *ub; 240 struct ucred *active_cred; 241 struct thread *td; 242{ 243 struct socket *so = fp->f_data; 244 int error; 245 246 bzero((caddr_t)ub, sizeof (*ub)); 247 ub->st_mode = S_IFSOCK; 248 NET_LOCK_GIANT(); 249 /* 250 * If SBS_CANTRCVMORE is set, but there's still data left in the 251 * receive buffer, the socket is still readable. 252 * 253 * XXXRW: perhaps should lock socket buffer so st_size result 254 * is consistent. 255 */ 256 /* Unlocked read. */ 257 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 258 so->so_rcv.sb_cc != 0) 259 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 260 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 261 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 262 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 263 ub->st_uid = so->so_cred->cr_uid; 264 ub->st_gid = so->so_cred->cr_gid; 265 error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 266 NET_UNLOCK_GIANT(); 267 return (error); 268} 269 270/* 271 * API socket close on file pointer. We call soclose() to close the 272 * socket (including initiating closing protocols). soclose() will 273 * sorele() the file reference but the actual socket will not go away 274 * until the socket's ref count hits 0. 275 */ 276/* ARGSUSED */ 277int 278soo_close(fp, td) 279 struct file *fp; 280 struct thread *td; 281{ 282 int error = 0; 283 struct socket *so; 284 285 NET_LOCK_GIANT(); 286 so = fp->f_data; 287 fp->f_ops = &badfileops; 288 fp->f_data = NULL; 289 290 if (so) 291 error = soclose(so); 292 NET_UNLOCK_GIANT(); 293 return (error); 294} 295