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 "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 55 struct 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 */ 67 int 68 soo_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 */ 94 int 95 soo_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 } 120 121 int 122 soo_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 } 207 208 int 209 soo_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 } 219 220 int 221 soo_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; 228 229 bzero((caddr_t)ub, sizeof (*ub)); 230 ub->st_mode = S_IFSOCK; 231 /* 232 * If SBS_CANTRCVMORE is set, but there's still data left in the 233 * receive buffer, the socket is still readable. 234 * 235 * XXXRW: perhaps should lock socket buffer so st_size result 236 * is consistent. 237 */ 238 /* Unlocked read. */ 239 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 || 240 so->so_rcv.sb_cc != 0) 241 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 242 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0) 243 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 244 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 245 ub->st_uid = so->so_cred->cr_uid; 246 ub->st_gid = so->so_cred->cr_gid; 247 return ((*so->so_proto->pr_usrreqs->pru_sense)(so, ub)); 248 } 249 250 /* 251 * API socket close on file pointer. We call soclose() to close the 252 * socket (including initiating closing protocols). soclose() will 253 * sorele() the file reference but the actual socket will not go away 254 * until the socket's ref count hits 0. 255 */ 256 /* ARGSUSED */ 257 int 258 soo_close(fp, td) 259 struct file *fp; 260 struct thread *td; 261 { 262 int error = 0; 263 struct socket *so; 264 265 so = fp->f_data; 266 fp->f_ops = &badfileops; 267 fp->f_data = NULL; 268 269 if (so) 270 error = soclose(so); 271 return (error); 272 } 273