sys_socket.c revision 196019
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 196019 2009-08-01 19:26:27Z rwatson $"); 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 CURVNET_SET(so->so_vnet); 84 error = soreceive(so, 0, uio, 0, 0, 0); 85 CURVNET_RESTORE(); 86 return (error); 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 error = mac_socket_check_send(active_cred, so); 99 if (error) 100 return (error); 101#endif 102 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 103 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 104 PROC_LOCK(uio->uio_td->td_proc); 105 psignal(uio->uio_td->td_proc, SIGPIPE); 106 PROC_UNLOCK(uio->uio_td->td_proc); 107 } 108 return (error); 109} 110 111int 112soo_truncate(struct file *fp, off_t length, struct ucred *active_cred, 113 struct thread *td) 114{ 115 116 return (EINVAL); 117} 118 119int 120soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 121 struct thread *td) 122{ 123 struct socket *so = fp->f_data; 124 int error = 0; 125 126 CURVNET_SET(so->so_vnet); 127 switch (cmd) { 128 case FIONBIO: 129 SOCK_LOCK(so); 130 if (*(int *)data) 131 so->so_state |= SS_NBIO; 132 else 133 so->so_state &= ~SS_NBIO; 134 SOCK_UNLOCK(so); 135 break; 136 137 case FIOASYNC: 138 /* 139 * XXXRW: This code separately acquires SOCK_LOCK(so) and 140 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 141 * mutex to avoid introducing the assumption that they are 142 * the same. 143 */ 144 if (*(int *)data) { 145 SOCK_LOCK(so); 146 so->so_state |= SS_ASYNC; 147 SOCK_UNLOCK(so); 148 SOCKBUF_LOCK(&so->so_rcv); 149 so->so_rcv.sb_flags |= SB_ASYNC; 150 SOCKBUF_UNLOCK(&so->so_rcv); 151 SOCKBUF_LOCK(&so->so_snd); 152 so->so_snd.sb_flags |= SB_ASYNC; 153 SOCKBUF_UNLOCK(&so->so_snd); 154 } else { 155 SOCK_LOCK(so); 156 so->so_state &= ~SS_ASYNC; 157 SOCK_UNLOCK(so); 158 SOCKBUF_LOCK(&so->so_rcv); 159 so->so_rcv.sb_flags &= ~SB_ASYNC; 160 SOCKBUF_UNLOCK(&so->so_rcv); 161 SOCKBUF_LOCK(&so->so_snd); 162 so->so_snd.sb_flags &= ~SB_ASYNC; 163 SOCKBUF_UNLOCK(&so->so_snd); 164 } 165 break; 166 167 case FIONREAD: 168 /* Unlocked read. */ 169 *(int *)data = so->so_rcv.sb_cc; 170 break; 171 172 case FIONWRITE: 173 /* Unlocked read. */ 174 *(int *)data = so->so_snd.sb_cc; 175 break; 176 177 case FIONSPACE: 178 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) || 179 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 180 *(int *)data = 0; 181 else 182 *(int *)data = sbspace(&so->so_snd); 183 break; 184 185 case FIOSETOWN: 186 error = fsetown(*(int *)data, &so->so_sigio); 187 break; 188 189 case FIOGETOWN: 190 *(int *)data = fgetown(&so->so_sigio); 191 break; 192 193 case SIOCSPGRP: 194 error = fsetown(-(*(int *)data), &so->so_sigio); 195 break; 196 197 case SIOCGPGRP: 198 *(int *)data = -fgetown(&so->so_sigio); 199 break; 200 201 case SIOCATMARK: 202 /* Unlocked read. */ 203 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 204 break; 205 default: 206 /* 207 * Interface/routing/protocol specific ioctls: interface and 208 * routing ioctls should have a different entry since a 209 * socket is unnecessary. 210 */ 211 if (IOCGROUP(cmd) == 'i') 212 error = ifioctl(so, cmd, data, td); 213 else if (IOCGROUP(cmd) == 'r') 214 error = rtioctl_fib(cmd, data, so->so_fibnum); 215 else 216 error = ((*so->so_proto->pr_usrreqs->pru_control) 217 (so, cmd, data, 0, td)); 218 break; 219 } 220 CURVNET_RESTORE(); 221 return (error); 222} 223 224int 225soo_poll(struct file *fp, int events, struct ucred *active_cred, 226 struct thread *td) 227{ 228 struct socket *so = fp->f_data; 229#ifdef MAC 230 int error; 231 232 error = mac_socket_check_poll(active_cred, so); 233 if (error) 234 return (error); 235#endif 236 return (sopoll(so, events, fp->f_cred, td)); 237} 238 239int 240soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 241 struct thread *td) 242{ 243 struct socket *so = fp->f_data; 244#ifdef MAC 245 int error; 246#endif 247 248 bzero((caddr_t)ub, sizeof (*ub)); 249 ub->st_mode = S_IFSOCK; 250#ifdef MAC 251 error = mac_socket_check_stat(active_cred, so); 252 if (error) 253 return (error); 254#endif 255 /* 256 * If SBS_CANTRCVMORE is set, but there's still data left in the 257 * receive buffer, the socket is still readable. 258 */ 259 SOCKBUF_LOCK(&so->so_rcv); 260 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 261 so->so_rcv.sb_cc != 0) 262 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 263 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 264 SOCKBUF_UNLOCK(&so->so_rcv); 265 /* Unlocked read. */ 266 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 267 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 268 ub->st_uid = so->so_cred->cr_uid; 269 ub->st_gid = so->so_cred->cr_gid; 270 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 271} 272 273/* 274 * API socket close on file pointer. We call soclose() to close the socket 275 * (including initiating closing protocols). soclose() will sorele() the 276 * file reference but the actual socket will not go away until the socket's 277 * ref count hits 0. 278 */ 279/* ARGSUSED */ 280int 281soo_close(struct file *fp, struct thread *td) 282{ 283 int error = 0; 284 struct socket *so; 285 286 so = fp->f_data; 287 fp->f_ops = &badfileops; 288 fp->f_data = NULL; 289 290 if (so) 291 error = soclose(so); 292 return (error); 293} 294