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/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 #include <sys/vimage.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 58 #include <security/mac/mac_framework.h> 59 60 struct fileops socketops = { 61 .fo_read = soo_read, 62 .fo_write = soo_write, 63 .fo_truncate = soo_truncate, 64 .fo_ioctl = soo_ioctl, 65 .fo_poll = soo_poll, 66 .fo_kqfilter = soo_kqfilter, 67 .fo_stat = soo_stat, 68 .fo_close = soo_close, 69 .fo_flags = DFLAG_PASSABLE 70 }; 71 72 /* ARGSUSED */ 73 int 74 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 75 int flags, struct thread *td) 76 { 77 struct socket *so = fp->f_data; 78 int error; 79 80 #ifdef MAC 81 SOCK_LOCK(so); 82 error = mac_socket_check_receive(active_cred, so); 83 SOCK_UNLOCK(so); 84 if (error) 85 return (error); 86 #endif 87 CURVNET_SET(so->so_vnet); 88 error = soreceive(so, 0, uio, 0, 0, 0); 89 CURVNET_RESTORE(); 90 return (error); 91 } 92 93 /* ARGSUSED */ 94 int 95 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 96 int flags, struct thread *td) 97 { 98 struct socket *so = fp->f_data; 99 int error; 100 101 #ifdef MAC 102 SOCK_LOCK(so); 103 error = mac_socket_check_send(active_cred, so); 104 SOCK_UNLOCK(so); 105 if (error) 106 return (error); 107 #endif 108 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 109 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 110 PROC_LOCK(uio->uio_td->td_proc); 111 psignal(uio->uio_td->td_proc, SIGPIPE); 112 PROC_UNLOCK(uio->uio_td->td_proc); 113 } 114 return (error); 115 } 116 117 int 118 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 119 struct thread *td) 120 { 121 122 return (EINVAL); 123 } 124 125 int 126 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 127 struct thread *td) 128 { 129 struct socket *so = fp->f_data; 130 int error = 0; 131 132 CURVNET_SET(so->so_vnet); 133 switch (cmd) { 134 case FIONBIO: 135 SOCK_LOCK(so); 136 if (*(int *)data) 137 so->so_state |= SS_NBIO; 138 else 139 so->so_state &= ~SS_NBIO; 140 SOCK_UNLOCK(so); 141 break; 142 143 case FIOASYNC: 144 /* 145 * XXXRW: This code separately acquires SOCK_LOCK(so) and 146 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 147 * mutex to avoid introducing the assumption that they are 148 * the same. 149 */ 150 if (*(int *)data) { 151 SOCK_LOCK(so); 152 so->so_state |= SS_ASYNC; 153 SOCK_UNLOCK(so); 154 SOCKBUF_LOCK(&so->so_rcv); 155 so->so_rcv.sb_flags |= SB_ASYNC; 156 SOCKBUF_UNLOCK(&so->so_rcv); 157 SOCKBUF_LOCK(&so->so_snd); 158 so->so_snd.sb_flags |= SB_ASYNC; 159 SOCKBUF_UNLOCK(&so->so_snd); 160 } else { 161 SOCK_LOCK(so); 162 so->so_state &= ~SS_ASYNC; 163 SOCK_UNLOCK(so); 164 SOCKBUF_LOCK(&so->so_rcv); 165 so->so_rcv.sb_flags &= ~SB_ASYNC; 166 SOCKBUF_UNLOCK(&so->so_rcv); 167 SOCKBUF_LOCK(&so->so_snd); 168 so->so_snd.sb_flags &= ~SB_ASYNC; 169 SOCKBUF_UNLOCK(&so->so_snd); 170 } 171 break; 172 173 case FIONREAD: 174 /* Unlocked read. */ 175 *(int *)data = so->so_rcv.sb_cc; 176 break; 177 178 case FIOSETOWN: 179 error = fsetown(*(int *)data, &so->so_sigio); 180 break; 181 182 case FIOGETOWN: 183 *(int *)data = fgetown(&so->so_sigio); 184 break; 185 186 case SIOCSPGRP: 187 error = fsetown(-(*(int *)data), &so->so_sigio); 188 break; 189 190 case SIOCGPGRP: 191 *(int *)data = -fgetown(&so->so_sigio); 192 break; 193 194 case SIOCATMARK: 195 /* Unlocked read. */ 196 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 197 break; 198 default: 199 /* 200 * Interface/routing/protocol specific ioctls: interface and 201 * routing ioctls should have a different entry since a 202 * socket is unnecessary. 203 */ 204 if (IOCGROUP(cmd) == 'i') 205 error = ifioctl(so, cmd, data, td); 206 else if (IOCGROUP(cmd) == 'r') 207 error = rtioctl_fib(cmd, data, so->so_fibnum); 208 else 209 error = ((*so->so_proto->pr_usrreqs->pru_control) 210 (so, cmd, data, 0, td)); 211 break; 212 } 213 CURVNET_RESTORE(); 214 return (error); 215 } 216 217 int 218 soo_poll(struct file *fp, int events, struct ucred *active_cred, 219 struct thread *td) 220 { 221 struct socket *so = fp->f_data; 222 #ifdef MAC 223 int error; 224 225 SOCK_LOCK(so); 226 error = mac_socket_check_poll(active_cred, so); 227 SOCK_UNLOCK(so); 228 if (error) 229 return (error); 230 #endif 231 return (sopoll(so, events, fp->f_cred, td)); 232 } 233 234 int 235 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 236 struct thread *td) 237 { 238 struct socket *so = fp->f_data; 239 #ifdef MAC 240 int error; 241 #endif 242 243 bzero((caddr_t)ub, sizeof (*ub)); 244 ub->st_mode = S_IFSOCK; 245 #ifdef MAC 246 SOCK_LOCK(so); 247 error = mac_socket_check_stat(active_cred, so); 248 SOCK_UNLOCK(so); 249 if (error) 250 return (error); 251 #endif 252 /* 253 * If SBS_CANTRCVMORE is set, but there's still data left in the 254 * receive buffer, the socket is still readable. 255 */ 256 SOCKBUF_LOCK(&so->so_rcv); 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 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 261 SOCKBUF_UNLOCK(&so->so_rcv); 262 /* Unlocked read. */ 263 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 264 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 265 ub->st_uid = so->so_cred->cr_uid; 266 ub->st_gid = so->so_cred->cr_gid; 267 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 268 } 269 270 /* 271 * API socket close on file pointer. We call soclose() to close the socket 272 * (including initiating closing protocols). soclose() will sorele() the 273 * file reference but the actual socket will not go away until the socket's 274 * ref count hits 0. 275 */ 276 /* ARGSUSED */ 277 int 278 soo_close(struct file *fp, struct thread *td) 279 { 280 int error = 0; 281 struct socket *so; 282 283 so = fp->f_data; 284 fp->f_ops = &badfileops; 285 fp->f_data = NULL; 286 287 if (so) 288 error = soclose(so); 289 return (error); 290 } 291