sys_socket.c revision 104571
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: head/sys/kern/sys_socket.c 104571 2002-10-06 14:39:15Z rwatson $ 35 */ 36 37#include "opt_mac.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/file.h> 42#include <sys/mac.h> 43#include <sys/protosw.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/filedesc.h> 51#include <sys/ucred.h> 52 53#include <net/if.h> 54#include <net/route.h> 55 56struct fileops socketops = { 57 soo_read, soo_write, soo_ioctl, soo_poll, sokqfilter, 58 soo_stat, soo_close 59}; 60 61/* ARGSUSED */ 62int 63soo_read(fp, uio, active_cred, flags, td) 64 struct file *fp; 65 struct uio *uio; 66 struct ucred *active_cred; 67 struct thread *td; 68 int flags; 69{ 70 struct socket *so = (struct socket *)fp->f_data; 71 int error; 72 73 mtx_lock(&Giant); 74#ifdef MAC 75 error = mac_check_socket_receive(active_cred, so); 76 if (error) { 77 mtx_unlock(&Giant); 78 return (error); 79 } 80#endif 81 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 82 mtx_unlock(&Giant); 83 return (error); 84} 85 86/* ARGSUSED */ 87int 88soo_write(fp, uio, active_cred, flags, td) 89 struct file *fp; 90 struct uio *uio; 91 struct ucred *active_cred; 92 struct thread *td; 93 int flags; 94{ 95 struct socket *so = (struct socket *)fp->f_data; 96 int error; 97 98 mtx_lock(&Giant); 99#ifdef MAC 100 error = mac_check_socket_send(active_cred, so); 101 if (error) { 102 mtx_unlock(&Giant); 103 return (error); 104 } 105#endif 106 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 107 uio->uio_td); 108 mtx_unlock(&Giant); 109 return (error); 110} 111 112int 113soo_ioctl(fp, cmd, data, active_cred, td) 114 struct file *fp; 115 u_long cmd; 116 void *data; 117 struct ucred *active_cred; 118 struct thread *td; 119{ 120 register struct socket *so = (struct socket *)fp->f_data; 121 122 switch (cmd) { 123 124 case FIONBIO: 125 if (*(int *)data) 126 so->so_state |= SS_NBIO; 127 else 128 so->so_state &= ~SS_NBIO; 129 return (0); 130 131 case FIOASYNC: 132 if (*(int *)data) { 133 so->so_state |= SS_ASYNC; 134 so->so_rcv.sb_flags |= SB_ASYNC; 135 so->so_snd.sb_flags |= SB_ASYNC; 136 } else { 137 so->so_state &= ~SS_ASYNC; 138 so->so_rcv.sb_flags &= ~SB_ASYNC; 139 so->so_snd.sb_flags &= ~SB_ASYNC; 140 } 141 return (0); 142 143 case FIONREAD: 144 *(int *)data = so->so_rcv.sb_cc; 145 return (0); 146 147 case FIOSETOWN: 148 return (fsetown(*(int *)data, &so->so_sigio)); 149 150 case FIOGETOWN: 151 *(int *)data = fgetown(&so->so_sigio); 152 return (0); 153 154 case SIOCSPGRP: 155 return (fsetown(-(*(int *)data), &so->so_sigio)); 156 157 case SIOCGPGRP: 158 *(int *)data = -fgetown(&so->so_sigio); 159 return (0); 160 161 case SIOCATMARK: 162 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 163 return (0); 164 } 165 /* 166 * Interface/routing/protocol specific ioctls: 167 * interface and routing ioctls should have a 168 * different entry since a socket's unnecessary 169 */ 170 if (IOCGROUP(cmd) == 'i') 171 return (ifioctl(so, cmd, data, td)); 172 if (IOCGROUP(cmd) == 'r') 173 return (rtioctl(cmd, data)); 174 return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td)); 175} 176 177int 178soo_poll(fp, events, active_cred, td) 179 struct file *fp; 180 int events; 181 struct ucred *active_cred; 182 struct thread *td; 183{ 184 struct socket *so = (struct socket *)fp->f_data; 185 return so->so_proto->pr_usrreqs->pru_sopoll(so, events, 186 fp->f_cred, td); 187} 188 189int 190soo_stat(fp, ub, active_cred, td) 191 struct file *fp; 192 struct stat *ub; 193 struct ucred *active_cred; 194 struct thread *td; 195{ 196 struct socket *so = (struct socket *)fp->f_data; 197 198 bzero((caddr_t)ub, sizeof (*ub)); 199 ub->st_mode = S_IFSOCK; 200 /* 201 * If SS_CANTRCVMORE is set, but there's still data left in the 202 * receive buffer, the socket is still readable. 203 */ 204 if ((so->so_state & SS_CANTRCVMORE) == 0 || 205 so->so_rcv.sb_cc != 0) 206 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 207 if ((so->so_state & SS_CANTSENDMORE) == 0) 208 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 209 ub->st_size = so->so_rcv.sb_cc; 210 ub->st_uid = so->so_cred->cr_uid; 211 ub->st_gid = so->so_cred->cr_gid; 212 return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub)); 213} 214 215/* 216 * API socket close on file pointer. We call soclose() to close the 217 * socket (including initiating closing protocols). soclose() will 218 * sorele() the file reference but the actual socket will not go away 219 * until the socket's ref count hits 0. 220 */ 221/* ARGSUSED */ 222int 223soo_close(fp, td) 224 struct file *fp; 225 struct thread *td; 226{ 227 int error = 0; 228 struct socket *so; 229 230 so = (struct socket *)fp->f_data; 231 fp->f_ops = &badfileops; 232 fp->f_data = 0; 233 234 if (so) 235 error = soclose(so); 236 return (error); 237} 238