sys_socket.c revision 132554
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 132554 2004-07-22 20:40:23Z 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/mac.h> 42#include <sys/protosw.h> 43#include <sys/sigio.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 55struct fileops socketops = { 56 .fo_read = soo_read, 57 .fo_write = soo_write, 58 .fo_ioctl = soo_ioctl, 59 .fo_poll = soo_poll, 60 .fo_kqfilter = soo_kqfilter, 61 .fo_stat = soo_stat, 62 .fo_close = soo_close, 63 .fo_flags = DFLAG_PASSABLE 64}; 65 66/* ARGSUSED */ 67int 68soo_read(fp, uio, active_cred, flags, td) 69 struct file *fp; 70 struct uio *uio; 71 struct ucred *active_cred; 72 struct thread *td; 73 int flags; 74{ 75 struct socket *so = fp->f_data; 76 int error; 77 78 NET_LOCK_GIANT(); 79#ifdef MAC 80 SOCK_LOCK(so); 81 error = mac_check_socket_receive(active_cred, so); 82 SOCK_UNLOCK(so); 83 if (error) { 84 NET_UNLOCK_GIANT(); 85 return (error); 86 } 87#endif 88 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 89 NET_UNLOCK_GIANT(); 90 return (error); 91} 92 93/* ARGSUSED */ 94int 95soo_write(fp, uio, active_cred, flags, td) 96 struct file *fp; 97 struct uio *uio; 98 struct ucred *active_cred; 99 struct thread *td; 100 int flags; 101{ 102 struct socket *so = fp->f_data; 103 int error; 104 105 NET_LOCK_GIANT(); 106#ifdef MAC 107 SOCK_LOCK(so); 108 error = mac_check_socket_send(active_cred, so); 109 SOCK_UNLOCK(so); 110 if (error) { 111 NET_UNLOCK_GIANT(); 112 return (error); 113 } 114#endif 115 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 116 uio->uio_td); 117 NET_UNLOCK_GIANT(); 118 return (error); 119} 120 121int 122soo_ioctl(fp, cmd, data, active_cred, td) 123 struct file *fp; 124 u_long cmd; 125 void *data; 126 struct ucred *active_cred; 127 struct thread *td; 128{ 129 register struct socket *so = fp->f_data; 130 131 switch (cmd) { 132 133 case FIONBIO: 134 SOCK_LOCK(so); 135 if (*(int *)data) 136 so->so_state |= SS_NBIO; 137 else 138 so->so_state &= ~SS_NBIO; 139 SOCK_UNLOCK(so); 140 return (0); 141 142 case FIOASYNC: 143 /* 144 * XXXRW: This code separately acquires SOCK_LOCK(so) 145 * and SOCKBUF_LOCK(&so->so_rcv) even though they are 146 * the same mutex to avoid introducing the assumption 147 * that they are the same. 148 */ 149 if (*(int *)data) { 150 SOCK_LOCK(so); 151 so->so_state |= SS_ASYNC; 152 SOCK_UNLOCK(so); 153 SOCKBUF_LOCK(&so->so_rcv); 154 so->so_rcv.sb_flags |= SB_ASYNC; 155 SOCKBUF_UNLOCK(&so->so_rcv); 156 SOCKBUF_LOCK(&so->so_snd); 157 so->so_snd.sb_flags |= SB_ASYNC; 158 SOCKBUF_UNLOCK(&so->so_snd); 159 } else { 160 SOCK_LOCK(so); 161 so->so_state &= ~SS_ASYNC; 162 SOCK_UNLOCK(so); 163 SOCKBUF_LOCK(&so->so_rcv); 164 so->so_rcv.sb_flags &= ~SB_ASYNC; 165 SOCKBUF_UNLOCK(&so->so_rcv); 166 SOCKBUF_LOCK(&so->so_snd); 167 so->so_snd.sb_flags &= ~SB_ASYNC; 168 SOCKBUF_UNLOCK(&so->so_snd); 169 } 170 return (0); 171 172 case FIONREAD: 173 /* Unlocked read. */ 174 *(int *)data = so->so_rcv.sb_cc; 175 return (0); 176 177 case FIOSETOWN: 178 return (fsetown(*(int *)data, &so->so_sigio)); 179 180 case FIOGETOWN: 181 *(int *)data = fgetown(&so->so_sigio); 182 return (0); 183 184 case SIOCSPGRP: 185 return (fsetown(-(*(int *)data), &so->so_sigio)); 186 187 case SIOCGPGRP: 188 *(int *)data = -fgetown(&so->so_sigio); 189 return (0); 190 191 case SIOCATMARK: 192 /* Unlocked read. */ 193 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 194 return (0); 195 } 196 /* 197 * Interface/routing/protocol specific ioctls: 198 * interface and routing ioctls should have a 199 * different entry since a socket's unnecessary 200 */ 201 if (IOCGROUP(cmd) == 'i') 202 return (ifioctl(so, cmd, data, td)); 203 if (IOCGROUP(cmd) == 'r') 204 return (rtioctl(cmd, data)); 205 return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td)); 206} 207 208int 209soo_poll(fp, events, active_cred, td) 210 struct file *fp; 211 int events; 212 struct ucred *active_cred; 213 struct thread *td; 214{ 215 struct socket *so = fp->f_data; 216 return so->so_proto->pr_usrreqs->pru_sopoll(so, events, 217 fp->f_cred, td); 218} 219 220int 221soo_stat(fp, ub, active_cred, td) 222 struct file *fp; 223 struct stat *ub; 224 struct ucred *active_cred; 225 struct thread *td; 226{ 227 struct socket *so = fp->f_data; 228 int error; 229 230 bzero((caddr_t)ub, sizeof (*ub)); 231 ub->st_mode = S_IFSOCK; 232 NET_LOCK_GIANT(); 233 /* 234 * If SBS_CANTRCVMORE is set, but there's still data left in the 235 * receive buffer, the socket is still readable. 236 * 237 * XXXRW: perhaps should lock socket buffer so st_size result 238 * is consistent. 239 */ 240 /* Unlocked read. */ 241 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 242 so->so_rcv.sb_cc != 0) 243 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 244 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 245 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 246 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 247 ub->st_uid = so->so_cred->cr_uid; 248 ub->st_gid = so->so_cred->cr_gid; 249 error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 250 NET_UNLOCK_GIANT(); 251 return (error); 252} 253 254/* 255 * API socket close on file pointer. We call soclose() to close the 256 * socket (including initiating closing protocols). soclose() will 257 * sorele() the file reference but the actual socket will not go away 258 * until the socket's ref count hits 0. 259 */ 260/* ARGSUSED */ 261int 262soo_close(fp, td) 263 struct file *fp; 264 struct thread *td; 265{ 266 int error = 0; 267 struct socket *so; 268 269 NET_LOCK_GIANT(); 270 so = fp->f_data; 271 fp->f_ops = &badfileops; 272 fp->f_data = NULL; 273 274 if (so) 275 error = soclose(so); 276 NET_UNLOCK_GIANT(); 277 return (error); 278} 279