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("$FreeBSD$"); 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/proc.h> 43 #include <sys/protosw.h> 44 #include <sys/sigio.h> 45 #include <sys/signal.h> 46 #include <sys/signalvar.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/filio.h> /* XXX */ 50 #include <sys/sockio.h> 51 #include <sys/stat.h> 52 #include <sys/uio.h> 53 #include <sys/ucred.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 58 struct fileops socketops = { 59 .fo_read = soo_read, 60 .fo_write = soo_write, 61 .fo_ioctl = soo_ioctl, 62 .fo_poll = soo_poll, 63 .fo_kqfilter = soo_kqfilter, 64 .fo_stat = soo_stat, 65 .fo_close = soo_close, 66 .fo_flags = DFLAG_PASSABLE 67 }; 68 69 /* ARGSUSED */ 70 int 71 soo_read(fp, uio, active_cred, flags, td) 72 struct file *fp; 73 struct uio *uio; 74 struct ucred *active_cred; 75 struct thread *td; 76 int flags; 77 { 78 struct socket *so = fp->f_data; 79 int error; 80 81 NET_LOCK_GIANT(); 82 #ifdef MAC 83 SOCK_LOCK(so); 84 error = mac_check_socket_receive(active_cred, so); 85 SOCK_UNLOCK(so); 86 if (error) { 87 NET_UNLOCK_GIANT(); 88 return (error); 89 } 90 #endif 91 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 92 NET_UNLOCK_GIANT(); 93 return (error); 94 } 95 96 /* ARGSUSED */ 97 int 98 soo_write(fp, uio, active_cred, flags, td) 99 struct file *fp; 100 struct uio *uio; 101 struct ucred *active_cred; 102 struct thread *td; 103 int flags; 104 { 105 struct socket *so = fp->f_data; 106 int error; 107 108 NET_LOCK_GIANT(); 109 #ifdef MAC 110 SOCK_LOCK(so); 111 error = mac_check_socket_send(active_cred, so); 112 SOCK_UNLOCK(so); 113 if (error) { 114 NET_UNLOCK_GIANT(); 115 return (error); 116 } 117 #endif 118 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 119 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 } 128 129 int 130 soo_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 } 225 226 int 227 soo_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 = (so->so_proto->pr_usrreqs->pru_sopoll) 247 (so, events, fp->f_cred, td); 248 NET_UNLOCK_GIANT(); 249 250 return (error); 251 } 252 253 int 254 soo_stat(fp, ub, active_cred, td) 255 struct file *fp; 256 struct stat *ub; 257 struct ucred *active_cred; 258 struct thread *td; 259 { 260 struct socket *so = fp->f_data; 261 int error; 262 263 bzero((caddr_t)ub, sizeof (*ub)); 264 ub->st_mode = S_IFSOCK; 265 NET_LOCK_GIANT(); 266 #ifdef MAC 267 SOCK_LOCK(so); 268 error = mac_check_socket_stat(active_cred, so); 269 SOCK_UNLOCK(so); 270 if (error) { 271 NET_UNLOCK_GIANT(); 272 return (error); 273 } 274 #endif 275 /* 276 * If SBS_CANTRCVMORE is set, but there's still data left in the 277 * receive buffer, the socket is still readable. 278 * 279 * XXXRW: perhaps should lock socket buffer so st_size result 280 * is consistent. 281 */ 282 /* Unlocked read. */ 283 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 284 so->so_rcv.sb_cc != 0) 285 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 286 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 287 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 288 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 289 ub->st_uid = so->so_cred->cr_uid; 290 ub->st_gid = so->so_cred->cr_gid; 291 error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 292 NET_UNLOCK_GIANT(); 293 return (error); 294 } 295 296 /* 297 * API socket close on file pointer. We call soclose() to close the 298 * socket (including initiating closing protocols). soclose() will 299 * sorele() the file reference but the actual socket will not go away 300 * until the socket's ref count hits 0. 301 */ 302 /* ARGSUSED */ 303 int 304 soo_close(fp, td) 305 struct file *fp; 306 struct thread *td; 307 { 308 int error = 0; 309 struct socket *so; 310 311 NET_LOCK_GIANT(); 312 so = fp->f_data; 313 fp->f_ops = &badfileops; 314 fp->f_data = NULL; 315 316 if (so) 317 error = soclose(so); 318 NET_UNLOCK_GIANT(); 319 return (error); 320 } 321