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 <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_chmod = invfo_chmod, 68 .fo_chown = invfo_chown, 69 .fo_flags = DFLAG_PASSABLE 70}; 71 72/* ARGSUSED */ 73int 74soo_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 error = mac_socket_check_receive(active_cred, so); 82 if (error) 83 return (error); 84#endif 85 error = soreceive(so, 0, uio, 0, 0, 0); 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 tdsignal(uio->uio_td, 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 switch (cmd) { 127 case FIONBIO: 128 SOCK_LOCK(so); 129 if (*(int *)data) 130 so->so_state |= SS_NBIO; 131 else 132 so->so_state &= ~SS_NBIO; 133 SOCK_UNLOCK(so); 134 break; 135 136 case FIOASYNC: 137 /* 138 * XXXRW: This code separately acquires SOCK_LOCK(so) and 139 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 140 * mutex to avoid introducing the assumption that they are 141 * the same. 142 */ 143 if (*(int *)data) { 144 SOCK_LOCK(so); 145 so->so_state |= SS_ASYNC; 146 SOCK_UNLOCK(so); 147 SOCKBUF_LOCK(&so->so_rcv); 148 so->so_rcv.sb_flags |= SB_ASYNC; 149 SOCKBUF_UNLOCK(&so->so_rcv); 150 SOCKBUF_LOCK(&so->so_snd); 151 so->so_snd.sb_flags |= SB_ASYNC; 152 SOCKBUF_UNLOCK(&so->so_snd); 153 } else { 154 SOCK_LOCK(so); 155 so->so_state &= ~SS_ASYNC; 156 SOCK_UNLOCK(so); 157 SOCKBUF_LOCK(&so->so_rcv); 158 so->so_rcv.sb_flags &= ~SB_ASYNC; 159 SOCKBUF_UNLOCK(&so->so_rcv); 160 SOCKBUF_LOCK(&so->so_snd); 161 so->so_snd.sb_flags &= ~SB_ASYNC; 162 SOCKBUF_UNLOCK(&so->so_snd); 163 } 164 break; 165 166 case FIONREAD: 167 /* Unlocked read. */ 168 *(int *)data = so->so_rcv.sb_cc; 169 break; 170 171 case FIONWRITE: 172 /* Unlocked read. */ 173 *(int *)data = so->so_snd.sb_cc; 174 break; 175 176 case FIONSPACE: 177 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) || 178 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 179 *(int *)data = 0; 180 else 181 *(int *)data = sbspace(&so->so_snd); 182 break; 183 184 case FIOSETOWN: 185 error = fsetown(*(int *)data, &so->so_sigio); 186 break; 187 188 case FIOGETOWN: 189 *(int *)data = fgetown(&so->so_sigio); 190 break; 191 192 case SIOCSPGRP: 193 error = fsetown(-(*(int *)data), &so->so_sigio); 194 break; 195 196 case SIOCGPGRP: 197 *(int *)data = -fgetown(&so->so_sigio); 198 break; 199 200 case SIOCATMARK: 201 /* Unlocked read. */ 202 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 203 break; 204 default: 205 /* 206 * Interface/routing/protocol specific ioctls: interface and 207 * routing ioctls should have a different entry since a 208 * socket is unnecessary. 209 */ 210 if (IOCGROUP(cmd) == 'i') 211 error = ifioctl(so, cmd, data, td); 212 else if (IOCGROUP(cmd) == 'r') { 213 CURVNET_SET(so->so_vnet); 214 error = rtioctl_fib(cmd, data, so->so_fibnum); 215 CURVNET_RESTORE(); 216 } else { 217 CURVNET_SET(so->so_vnet); 218 error = ((*so->so_proto->pr_usrreqs->pru_control) 219 (so, cmd, data, 0, td)); 220 CURVNET_RESTORE(); 221 } 222 break; 223 } 224 return (error); 225} 226 227int 228soo_poll(struct file *fp, int events, struct ucred *active_cred, 229 struct thread *td) 230{ 231 struct socket *so = fp->f_data; 232#ifdef MAC 233 int error; 234 235 error = mac_socket_check_poll(active_cred, so); 236 if (error) 237 return (error); 238#endif 239 return (sopoll(so, events, fp->f_cred, td)); 240} 241 242int 243soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 244 struct thread *td) 245{ 246 struct socket *so = fp->f_data; 247#ifdef MAC 248 int error; 249#endif 250 251 bzero((caddr_t)ub, sizeof (*ub)); 252 ub->st_mode = S_IFSOCK; 253#ifdef MAC 254 error = mac_socket_check_stat(active_cred, so); 255 if (error) 256 return (error); 257#endif 258 /* 259 * If SBS_CANTRCVMORE is set, but there's still data left in the 260 * receive buffer, the socket is still readable. 261 */ 262 SOCKBUF_LOCK(&so->so_rcv); 263 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 264 so->so_rcv.sb_cc != 0) 265 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 266 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 267 SOCKBUF_UNLOCK(&so->so_rcv); 268 /* Unlocked read. */ 269 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 270 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 271 ub->st_uid = so->so_cred->cr_uid; 272 ub->st_gid = so->so_cred->cr_gid; 273 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 274} 275 276/* 277 * API socket close on file pointer. We call soclose() to close the socket 278 * (including initiating closing protocols). soclose() will sorele() the 279 * file reference but the actual socket will not go away until the socket's 280 * ref count hits 0. 281 */ 282/* ARGSUSED */ 283int 284soo_close(struct file *fp, struct thread *td) 285{ 286 int error = 0; 287 struct socket *so; 288 289 so = fp->f_data; 290 fp->f_ops = &badfileops; 291 fp->f_data = NULL; 292 293 if (so) 294 error = soclose(so); 295 return (error); 296} 297