sys_socket.c revision 110908
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 110908 2003-02-15 06:04:55Z alfred $ 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/filedesc.h> 43#include <sys/mac.h> 44#include <sys/protosw.h> 45#include <sys/sigio.h> 46#include <sys/socket.h> 47#include <sys/socketvar.h> 48#include <sys/filio.h> /* XXX */ 49#include <sys/sockio.h> 50#include <sys/stat.h> 51#include <sys/uio.h> 52#include <sys/filedesc.h> 53#include <sys/ucred.h> 54 55#include <net/if.h> 56#include <net/route.h> 57 58struct fileops socketops = { 59 soo_read, soo_write, soo_ioctl, soo_poll, soo_kqfilter, 60 soo_stat, soo_close, DFLAG_PASSABLE 61}; 62 63/* ARGSUSED */ 64int 65soo_read(fp, uio, active_cred, flags, td) 66 struct file *fp; 67 struct uio *uio; 68 struct ucred *active_cred; 69 struct thread *td; 70 int flags; 71{ 72 struct socket *so = fp->f_data; 73 int error; 74 75 mtx_lock(&Giant); 76#ifdef MAC 77 error = mac_check_socket_receive(active_cred, so); 78 if (error) { 79 mtx_unlock(&Giant); 80 return (error); 81 } 82#endif 83 error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0); 84 mtx_unlock(&Giant); 85 return (error); 86} 87 88/* ARGSUSED */ 89int 90soo_write(fp, uio, active_cred, flags, td) 91 struct file *fp; 92 struct uio *uio; 93 struct ucred *active_cred; 94 struct thread *td; 95 int flags; 96{ 97 struct socket *so = fp->f_data; 98 int error; 99 100 mtx_lock(&Giant); 101#ifdef MAC 102 error = mac_check_socket_send(active_cred, so); 103 if (error) { 104 mtx_unlock(&Giant); 105 return (error); 106 } 107#endif 108 error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0, 109 uio->uio_td); 110 mtx_unlock(&Giant); 111 return (error); 112} 113 114int 115soo_ioctl(fp, cmd, data, active_cred, td) 116 struct file *fp; 117 u_long cmd; 118 void *data; 119 struct ucred *active_cred; 120 struct thread *td; 121{ 122 register struct socket *so = fp->f_data; 123 124 switch (cmd) { 125 126 case FIONBIO: 127 if (*(int *)data) 128 so->so_state |= SS_NBIO; 129 else 130 so->so_state &= ~SS_NBIO; 131 return (0); 132 133 case FIOASYNC: 134 if (*(int *)data) { 135 so->so_state |= SS_ASYNC; 136 so->so_rcv.sb_flags |= SB_ASYNC; 137 so->so_snd.sb_flags |= SB_ASYNC; 138 } else { 139 so->so_state &= ~SS_ASYNC; 140 so->so_rcv.sb_flags &= ~SB_ASYNC; 141 so->so_snd.sb_flags &= ~SB_ASYNC; 142 } 143 return (0); 144 145 case FIONREAD: 146 *(int *)data = so->so_rcv.sb_cc; 147 return (0); 148 149 case FIOSETOWN: 150 return (fsetown(*(int *)data, &so->so_sigio)); 151 152 case FIOGETOWN: 153 *(int *)data = fgetown(&so->so_sigio); 154 return (0); 155 156 case SIOCSPGRP: 157 return (fsetown(-(*(int *)data), &so->so_sigio)); 158 159 case SIOCGPGRP: 160 *(int *)data = -fgetown(&so->so_sigio); 161 return (0); 162 163 case SIOCATMARK: 164 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 165 return (0); 166 } 167 /* 168 * Interface/routing/protocol specific ioctls: 169 * interface and routing ioctls should have a 170 * different entry since a socket's unnecessary 171 */ 172 if (IOCGROUP(cmd) == 'i') 173 return (ifioctl(so, cmd, data, td)); 174 if (IOCGROUP(cmd) == 'r') 175 return (rtioctl(cmd, data)); 176 return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td)); 177} 178 179int 180soo_poll(fp, events, active_cred, td) 181 struct file *fp; 182 int events; 183 struct ucred *active_cred; 184 struct thread *td; 185{ 186 struct socket *so = fp->f_data; 187 return so->so_proto->pr_usrreqs->pru_sopoll(so, events, 188 fp->f_cred, td); 189} 190 191int 192soo_stat(fp, ub, active_cred, td) 193 struct file *fp; 194 struct stat *ub; 195 struct ucred *active_cred; 196 struct thread *td; 197{ 198 struct socket *so = fp->f_data; 199 200 bzero((caddr_t)ub, sizeof (*ub)); 201 ub->st_mode = S_IFSOCK; 202 /* 203 * If SS_CANTRCVMORE is set, but there's still data left in the 204 * receive buffer, the socket is still readable. 205 */ 206 if ((so->so_state & SS_CANTRCVMORE) == 0 || 207 so->so_rcv.sb_cc != 0) 208 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 209 if ((so->so_state & SS_CANTSENDMORE) == 0) 210 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 211 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 212 ub->st_uid = so->so_cred->cr_uid; 213 ub->st_gid = so->so_cred->cr_gid; 214 return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub)); 215} 216 217/* 218 * API socket close on file pointer. We call soclose() to close the 219 * socket (including initiating closing protocols). soclose() will 220 * sorele() the file reference but the actual socket will not go away 221 * until the socket's ref count hits 0. 222 */ 223/* ARGSUSED */ 224int 225soo_close(fp, td) 226 struct file *fp; 227 struct thread *td; 228{ 229 int error = 0; 230 struct socket *so; 231 232 so = fp->f_data; 233 fp->f_ops = &badfileops; 234 fp->f_data = NULL; 235 236 if (so) 237 error = soclose(so); 238 return (error); 239} 240