sys_socket.c revision 218757
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 218757 2011-02-16 21:29:13Z bz $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/file.h> 38#include <sys/filedesc.h> 39#include <sys/proc.h> 40#include <sys/protosw.h> 41#include <sys/sigio.h> 42#include <sys/signal.h> 43#include <sys/signalvar.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#include <net/vnet.h> 55 56#include <security/mac/mac_framework.h> 57 58struct fileops socketops = { 59 .fo_read = soo_read, 60 .fo_write = soo_write, 61 .fo_truncate = soo_truncate, 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 int error; 77 78#ifdef MAC 79 error = mac_socket_check_receive(active_cred, so); 80 if (error) 81 return (error); 82#endif 83 error = soreceive(so, 0, uio, 0, 0, 0); 84 return (error); 85} 86 87/* ARGSUSED */ 88int 89soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 90 int flags, struct thread *td) 91{ 92 struct socket *so = fp->f_data; 93 int error; 94 95#ifdef MAC 96 error = mac_socket_check_send(active_cred, so); 97 if (error) 98 return (error); 99#endif 100 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 101 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 102 PROC_LOCK(uio->uio_td->td_proc); 103 tdsignal(uio->uio_td, SIGPIPE); 104 PROC_UNLOCK(uio->uio_td->td_proc); 105 } 106 return (error); 107} 108 109int 110soo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 111 struct thread *td) 112{ 113 114 return (EINVAL); 115} 116 117int 118soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 119 struct thread *td) 120{ 121 struct socket *so = fp->f_data; 122 int error = 0; 123 124 switch (cmd) { 125 case FIONBIO: 126 SOCK_LOCK(so); 127 if (*(int *)data) 128 so->so_state |= SS_NBIO; 129 else 130 so->so_state &= ~SS_NBIO; 131 SOCK_UNLOCK(so); 132 break; 133 134 case FIOASYNC: 135 /* 136 * XXXRW: This code separately acquires SOCK_LOCK(so) and 137 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 138 * mutex to avoid introducing the assumption that they are 139 * the same. 140 */ 141 if (*(int *)data) { 142 SOCK_LOCK(so); 143 so->so_state |= SS_ASYNC; 144 SOCK_UNLOCK(so); 145 SOCKBUF_LOCK(&so->so_rcv); 146 so->so_rcv.sb_flags |= SB_ASYNC; 147 SOCKBUF_UNLOCK(&so->so_rcv); 148 SOCKBUF_LOCK(&so->so_snd); 149 so->so_snd.sb_flags |= SB_ASYNC; 150 SOCKBUF_UNLOCK(&so->so_snd); 151 } else { 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 } 162 break; 163 164 case FIONREAD: 165 /* Unlocked read. */ 166 *(int *)data = so->so_rcv.sb_cc; 167 break; 168 169 case FIONWRITE: 170 /* Unlocked read. */ 171 *(int *)data = so->so_snd.sb_cc; 172 break; 173 174 case FIONSPACE: 175 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) || 176 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 177 *(int *)data = 0; 178 else 179 *(int *)data = sbspace(&so->so_snd); 180 break; 181 182 case FIOSETOWN: 183 error = fsetown(*(int *)data, &so->so_sigio); 184 break; 185 186 case FIOGETOWN: 187 *(int *)data = fgetown(&so->so_sigio); 188 break; 189 190 case SIOCSPGRP: 191 error = fsetown(-(*(int *)data), &so->so_sigio); 192 break; 193 194 case SIOCGPGRP: 195 *(int *)data = -fgetown(&so->so_sigio); 196 break; 197 198 case SIOCATMARK: 199 /* Unlocked read. */ 200 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 201 break; 202 default: 203 /* 204 * Interface/routing/protocol specific ioctls: interface and 205 * routing ioctls should have a different entry since a 206 * socket is unnecessary. 207 */ 208 if (IOCGROUP(cmd) == 'i') 209 error = ifioctl(so, cmd, data, td); 210 else if (IOCGROUP(cmd) == 'r') { 211 CURVNET_SET(so->so_vnet); 212 error = rtioctl_fib(cmd, data, so->so_fibnum); 213 CURVNET_RESTORE(); 214 } else { 215 CURVNET_SET(so->so_vnet); 216 error = ((*so->so_proto->pr_usrreqs->pru_control) 217 (so, cmd, data, 0, td)); 218 CURVNET_RESTORE(); 219 } 220 break; 221 } 222 return (error); 223} 224 225int 226soo_poll(struct file *fp, int events, struct ucred *active_cred, 227 struct thread *td) 228{ 229 struct socket *so = fp->f_data; 230#ifdef MAC 231 int error; 232 233 error = mac_socket_check_poll(active_cred, so); 234 if (error) 235 return (error); 236#endif 237 return (sopoll(so, events, fp->f_cred, td)); 238} 239 240int 241soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 242 struct thread *td) 243{ 244 struct socket *so = fp->f_data; 245#ifdef MAC 246 int error; 247#endif 248 249 bzero((caddr_t)ub, sizeof (*ub)); 250 ub->st_mode = S_IFSOCK; 251#ifdef MAC 252 error = mac_socket_check_stat(active_cred, so); 253 if (error) 254 return (error); 255#endif 256 /* 257 * If SBS_CANTRCVMORE is set, but there's still data left in the 258 * receive buffer, the socket is still readable. 259 */ 260 SOCKBUF_LOCK(&so->so_rcv); 261 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 262 so->so_rcv.sb_cc != 0) 263 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 264 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 265 SOCKBUF_UNLOCK(&so->so_rcv); 266 /* Unlocked read. */ 267 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 268 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 269 ub->st_uid = so->so_cred->cr_uid; 270 ub->st_gid = so->so_cred->cr_gid; 271 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 272} 273 274/* 275 * API socket close on file pointer. We call soclose() to close the socket 276 * (including initiating closing protocols). soclose() will sorele() the 277 * file reference but the actual socket will not go away until the socket's 278 * ref count hits 0. 279 */ 280/* ARGSUSED */ 281int 282soo_close(struct file *fp, struct thread *td) 283{ 284 int error = 0; 285 struct socket *so; 286 287 so = fp->f_data; 288 fp->f_ops = &badfileops; 289 fp->f_data = NULL; 290 291 if (so) 292 error = soclose(so); 293 return (error); 294} 295