sys_socket.c revision 171744
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 171744 2007-08-06 14:26:03Z 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(struct file *fp, struct uio *uio, struct ucred *active_cred, 73 int flags, struct thread *td) 74{ 75 struct socket *so = fp->f_data; 76#ifdef MAC 77 int error; 78 79 SOCK_LOCK(so); 80 error = mac_check_socket_receive(active_cred, so); 81 SOCK_UNLOCK(so); 82 if (error) 83 return (error); 84#endif 85 return (soreceive(so, 0, uio, 0, 0, 0)); 86} 87 88/* ARGSUSED */ 89int 90soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 91 int flags, struct thread *td) 92{ 93 struct socket *so = fp->f_data; 94 int error; 95 96#ifdef MAC 97 SOCK_LOCK(so); 98 error = mac_check_socket_send(active_cred, so); 99 SOCK_UNLOCK(so); 100 if (error) 101 return (error); 102#endif 103 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 104 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 105 PROC_LOCK(uio->uio_td->td_proc); 106 psignal(uio->uio_td->td_proc, SIGPIPE); 107 PROC_UNLOCK(uio->uio_td->td_proc); 108 } 109 return (error); 110} 111 112int 113soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 114 struct thread *td) 115{ 116 struct socket *so = fp->f_data; 117 int error = 0; 118 119 switch (cmd) { 120 case FIONBIO: 121 SOCK_LOCK(so); 122 if (*(int *)data) 123 so->so_state |= SS_NBIO; 124 else 125 so->so_state &= ~SS_NBIO; 126 SOCK_UNLOCK(so); 127 break; 128 129 case FIOASYNC: 130 /* 131 * XXXRW: This code separately acquires SOCK_LOCK(so) and 132 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 133 * mutex to avoid introducing the assumption that they are 134 * the same. 135 */ 136 if (*(int *)data) { 137 SOCK_LOCK(so); 138 so->so_state |= SS_ASYNC; 139 SOCK_UNLOCK(so); 140 SOCKBUF_LOCK(&so->so_rcv); 141 so->so_rcv.sb_flags |= SB_ASYNC; 142 SOCKBUF_UNLOCK(&so->so_rcv); 143 SOCKBUF_LOCK(&so->so_snd); 144 so->so_snd.sb_flags |= SB_ASYNC; 145 SOCKBUF_UNLOCK(&so->so_snd); 146 } else { 147 SOCK_LOCK(so); 148 so->so_state &= ~SS_ASYNC; 149 SOCK_UNLOCK(so); 150 SOCKBUF_LOCK(&so->so_rcv); 151 so->so_rcv.sb_flags &= ~SB_ASYNC; 152 SOCKBUF_UNLOCK(&so->so_rcv); 153 SOCKBUF_LOCK(&so->so_snd); 154 so->so_snd.sb_flags &= ~SB_ASYNC; 155 SOCKBUF_UNLOCK(&so->so_snd); 156 } 157 break; 158 159 case FIONREAD: 160 /* Unlocked read. */ 161 *(int *)data = so->so_rcv.sb_cc; 162 break; 163 164 case FIOSETOWN: 165 error = fsetown(*(int *)data, &so->so_sigio); 166 break; 167 168 case FIOGETOWN: 169 *(int *)data = fgetown(&so->so_sigio); 170 break; 171 172 case SIOCSPGRP: 173 error = fsetown(-(*(int *)data), &so->so_sigio); 174 break; 175 176 case SIOCGPGRP: 177 *(int *)data = -fgetown(&so->so_sigio); 178 break; 179 180 case SIOCATMARK: 181 /* Unlocked read. */ 182 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 183 break; 184 default: 185 /* 186 * Interface/routing/protocol specific ioctls: interface and 187 * routing ioctls should have a different entry since a 188 * socket is unnecessary. 189 */ 190 if (IOCGROUP(cmd) == 'i') 191 error = ifioctl(so, cmd, data, td); 192 else if (IOCGROUP(cmd) == 'r') 193 error = rtioctl(cmd, data); 194 else 195 error = ((*so->so_proto->pr_usrreqs->pru_control) 196 (so, cmd, data, 0, td)); 197 break; 198 } 199 return (error); 200} 201 202int 203soo_poll(struct file *fp, int events, struct ucred *active_cred, 204 struct thread *td) 205{ 206 struct socket *so = fp->f_data; 207#ifdef MAC 208 int error; 209 210 SOCK_LOCK(so); 211 error = mac_check_socket_poll(active_cred, so); 212 SOCK_UNLOCK(so); 213 if (error) 214 return (error); 215#endif 216 return (sopoll(so, events, fp->f_cred, td)); 217} 218 219int 220soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 221 struct thread *td) 222{ 223 struct socket *so = fp->f_data; 224#ifdef MAC 225 int error; 226#endif 227 228 bzero((caddr_t)ub, sizeof (*ub)); 229 ub->st_mode = S_IFSOCK; 230#ifdef MAC 231 SOCK_LOCK(so); 232 error = mac_check_socket_stat(active_cred, so); 233 SOCK_UNLOCK(so); 234 if (error) 235 return (error); 236#endif 237 /* 238 * If SBS_CANTRCVMORE is set, but there's still data left in the 239 * receive buffer, the socket is still readable. 240 * 241 * XXXRW: perhaps should lock socket buffer so st_size result is 242 * consistent. 243 */ 244 /* Unlocked read. */ 245 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 246 so->so_rcv.sb_cc != 0) 247 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 248 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 249 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 250 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 251 ub->st_uid = so->so_cred->cr_uid; 252 ub->st_gid = so->so_cred->cr_gid; 253 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 254} 255 256/* 257 * API socket close on file pointer. We call soclose() to close the socket 258 * (including initiating closing protocols). soclose() will sorele() the 259 * file reference but the actual socket will not go away until the socket's 260 * ref count hits 0. 261 */ 262/* ARGSUSED */ 263int 264soo_close(struct file *fp, struct thread *td) 265{ 266 int error = 0; 267 struct socket *so; 268 269 so = fp->f_data; 270 fp->f_ops = &badfileops; 271 fp->f_data = NULL; 272 273 if (so) 274 error = soclose(so); 275 return (error); 276} 277