sys_socket.c revision 178888
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 178888 2008-05-09 23:03:00Z julian $"); 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_truncate = soo_truncate, 63 .fo_ioctl = soo_ioctl, 64 .fo_poll = soo_poll, 65 .fo_kqfilter = soo_kqfilter, 66 .fo_stat = soo_stat, 67 .fo_close = soo_close, 68 .fo_flags = DFLAG_PASSABLE 69}; 70 71/* ARGSUSED */ 72int 73soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 74 int flags, struct thread *td) 75{ 76 struct socket *so = fp->f_data; 77#ifdef MAC 78 int error; 79 80 SOCK_LOCK(so); 81 error = mac_socket_check_receive(active_cred, so); 82 SOCK_UNLOCK(so); 83 if (error) 84 return (error); 85#endif 86 return (soreceive(so, 0, uio, 0, 0, 0)); 87} 88 89/* ARGSUSED */ 90int 91soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 92 int flags, struct thread *td) 93{ 94 struct socket *so = fp->f_data; 95 int error; 96 97#ifdef MAC 98 SOCK_LOCK(so); 99 error = mac_socket_check_send(active_cred, so); 100 SOCK_UNLOCK(so); 101 if (error) 102 return (error); 103#endif 104 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 105 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 106 PROC_LOCK(uio->uio_td->td_proc); 107 psignal(uio->uio_td->td_proc, SIGPIPE); 108 PROC_UNLOCK(uio->uio_td->td_proc); 109 } 110 return (error); 111} 112 113int 114soo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 115 struct thread *td) 116{ 117 118 return (EINVAL); 119} 120 121int 122soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 123 struct thread *td) 124{ 125 struct socket *so = fp->f_data; 126 int error = 0; 127 128 switch (cmd) { 129 case FIONBIO: 130 SOCK_LOCK(so); 131 if (*(int *)data) 132 so->so_state |= SS_NBIO; 133 else 134 so->so_state &= ~SS_NBIO; 135 SOCK_UNLOCK(so); 136 break; 137 138 case FIOASYNC: 139 /* 140 * XXXRW: This code separately acquires SOCK_LOCK(so) and 141 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 142 * mutex to avoid introducing the assumption that they are 143 * the same. 144 */ 145 if (*(int *)data) { 146 SOCK_LOCK(so); 147 so->so_state |= SS_ASYNC; 148 SOCK_UNLOCK(so); 149 SOCKBUF_LOCK(&so->so_rcv); 150 so->so_rcv.sb_flags |= SB_ASYNC; 151 SOCKBUF_UNLOCK(&so->so_rcv); 152 SOCKBUF_LOCK(&so->so_snd); 153 so->so_snd.sb_flags |= SB_ASYNC; 154 SOCKBUF_UNLOCK(&so->so_snd); 155 } else { 156 SOCK_LOCK(so); 157 so->so_state &= ~SS_ASYNC; 158 SOCK_UNLOCK(so); 159 SOCKBUF_LOCK(&so->so_rcv); 160 so->so_rcv.sb_flags &= ~SB_ASYNC; 161 SOCKBUF_UNLOCK(&so->so_rcv); 162 SOCKBUF_LOCK(&so->so_snd); 163 so->so_snd.sb_flags &= ~SB_ASYNC; 164 SOCKBUF_UNLOCK(&so->so_snd); 165 } 166 break; 167 168 case FIONREAD: 169 /* Unlocked read. */ 170 *(int *)data = so->so_rcv.sb_cc; 171 break; 172 173 case FIOSETOWN: 174 error = fsetown(*(int *)data, &so->so_sigio); 175 break; 176 177 case FIOGETOWN: 178 *(int *)data = fgetown(&so->so_sigio); 179 break; 180 181 case SIOCSPGRP: 182 error = fsetown(-(*(int *)data), &so->so_sigio); 183 break; 184 185 case SIOCGPGRP: 186 *(int *)data = -fgetown(&so->so_sigio); 187 break; 188 189 case SIOCATMARK: 190 /* Unlocked read. */ 191 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 192 break; 193 default: 194 /* 195 * Interface/routing/protocol specific ioctls: interface and 196 * routing ioctls should have a different entry since a 197 * socket is unnecessary. 198 */ 199 if (IOCGROUP(cmd) == 'i') 200 error = ifioctl(so, cmd, data, td); 201 else if (IOCGROUP(cmd) == 'r') 202 error = rtioctl_fib(cmd, data, so->so_fibnum); 203 else 204 error = ((*so->so_proto->pr_usrreqs->pru_control) 205 (so, cmd, data, 0, td)); 206 break; 207 } 208 return (error); 209} 210 211int 212soo_poll(struct file *fp, int events, struct ucred *active_cred, 213 struct thread *td) 214{ 215 struct socket *so = fp->f_data; 216#ifdef MAC 217 int error; 218 219 SOCK_LOCK(so); 220 error = mac_socket_check_poll(active_cred, so); 221 SOCK_UNLOCK(so); 222 if (error) 223 return (error); 224#endif 225 return (sopoll(so, events, fp->f_cred, td)); 226} 227 228int 229soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 230 struct thread *td) 231{ 232 struct socket *so = fp->f_data; 233#ifdef MAC 234 int error; 235#endif 236 237 bzero((caddr_t)ub, sizeof (*ub)); 238 ub->st_mode = S_IFSOCK; 239#ifdef MAC 240 SOCK_LOCK(so); 241 error = mac_socket_check_stat(active_cred, so); 242 SOCK_UNLOCK(so); 243 if (error) 244 return (error); 245#endif 246 /* 247 * If SBS_CANTRCVMORE is set, but there's still data left in the 248 * receive buffer, the socket is still readable. 249 * 250 * XXXRW: perhaps should lock socket buffer so st_size result is 251 * consistent. 252 */ 253 /* Unlocked read. */ 254 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 255 so->so_rcv.sb_cc != 0) 256 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 257 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 258 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 259 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 260 ub->st_uid = so->so_cred->cr_uid; 261 ub->st_gid = so->so_cred->cr_gid; 262 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 263} 264 265/* 266 * API socket close on file pointer. We call soclose() to close the socket 267 * (including initiating closing protocols). soclose() will sorele() the 268 * file reference but the actual socket will not go away until the socket's 269 * ref count hits 0. 270 */ 271/* ARGSUSED */ 272int 273soo_close(struct file *fp, struct thread *td) 274{ 275 int error = 0; 276 struct socket *so; 277 278 so = fp->f_data; 279 fp->f_ops = &badfileops; 280 fp->f_data = NULL; 281 282 if (so) 283 error = soclose(so); 284 return (error); 285} 286