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: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $ 35 * $DragonFly: src/sys/kern/sys_socket.c,v 1.14 2007/04/22 01:13:10 dillon Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/file.h> 41 #include <sys/lock.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/socketops.h> 46 #include <sys/filio.h> /* XXX */ 47 #include <sys/sockio.h> 48 #include <sys/vnode.h> 49 #include <sys/stat.h> 50 #include <sys/uio.h> 51 #include <sys/filedesc.h> 52 #include <sys/ucred.h> 53 54 #include <sys/mplock2.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 struct fileops socketops = { 60 .fo_read = soo_read, 61 .fo_write = soo_write, 62 .fo_ioctl = soo_ioctl, 63 .fo_kqfilter = sokqfilter, 64 .fo_stat = soo_stat, 65 .fo_close = soo_close, 66 .fo_shutdown = soo_shutdown 67 }; 68 69 /* 70 * MPALMOSTSAFE - acquires mplock 71 */ 72 int 73 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 74 { 75 struct socket *so; 76 int error; 77 int msgflags; 78 79 get_mplock(); 80 so = (struct socket *)fp->f_data; 81 82 if (fflags & O_FBLOCKING) 83 msgflags = 0; 84 else if (fflags & O_FNONBLOCKING) 85 msgflags = MSG_FNONBLOCKING; 86 else if (fp->f_flag & FNONBLOCK) 87 msgflags = MSG_FNONBLOCKING; 88 else 89 msgflags = 0; 90 91 error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags); 92 rel_mplock(); 93 return (error); 94 } 95 96 /* 97 * MPALMOSTSAFE - acquires mplock 98 */ 99 int 100 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 101 { 102 struct socket *so; 103 int error; 104 int msgflags; 105 106 get_mplock(); 107 so = (struct socket *)fp->f_data; 108 109 if (fflags & O_FBLOCKING) 110 msgflags = 0; 111 else if (fflags & O_FNONBLOCKING) 112 msgflags = MSG_FNONBLOCKING; 113 else if (fp->f_flag & FNONBLOCK) 114 msgflags = MSG_FNONBLOCKING; 115 else 116 msgflags = 0; 117 118 error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td); 119 rel_mplock(); 120 return (error); 121 } 122 123 /* 124 * MPALMOSTSAFE - acquires mplock 125 */ 126 int 127 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, 128 struct ucred *cred, struct sysmsg *msg) 129 { 130 struct socket *so; 131 int error; 132 133 get_mplock(); 134 so = (struct socket *)fp->f_data; 135 136 switch (cmd) { 137 case FIOASYNC: 138 if (*(int *)data) { 139 so->so_state |= SS_ASYNC; 140 atomic_set_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 141 atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC); 142 } else { 143 so->so_state &= ~SS_ASYNC; 144 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 145 atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC); 146 } 147 error = 0; 148 break; 149 case FIONREAD: 150 *(int *)data = so->so_rcv.ssb_cc; 151 error = 0; 152 break; 153 case FIOSETOWN: 154 error = fsetown(*(int *)data, &so->so_sigio); 155 break; 156 case FIOGETOWN: 157 *(int *)data = fgetown(so->so_sigio); 158 error = 0; 159 break; 160 case SIOCSPGRP: 161 error = fsetown(-(*(int *)data), &so->so_sigio); 162 break; 163 case SIOCGPGRP: 164 *(int *)data = -fgetown(so->so_sigio); 165 error = 0; 166 break; 167 case SIOCATMARK: 168 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 169 error = 0; 170 break; 171 default: 172 /* 173 * Interface/routing/protocol specific ioctls: 174 * interface and routing ioctls should have a 175 * different entry since a socket's unnecessary 176 */ 177 if (IOCGROUP(cmd) == 'i') 178 error = ifioctl(so, cmd, data, cred); 179 else if (IOCGROUP(cmd) == 'r') 180 error = rtioctl(cmd, data, cred); 181 else 182 error = so_pru_control(so, cmd, data, NULL); 183 break; 184 } 185 rel_mplock(); 186 return (error); 187 } 188 189 /* 190 * MPSAFE - acquires mplock 191 */ 192 int 193 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred) 194 { 195 struct socket *so; 196 int error; 197 198 bzero((caddr_t)ub, sizeof (*ub)); 199 ub->st_mode = S_IFSOCK; 200 so = (struct socket *)fp->f_data; 201 202 /* 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.ssb_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.ssb_cc; 212 ub->st_uid = so->so_cred->cr_uid; 213 ub->st_gid = so->so_cred->cr_gid; 214 error = so_pru_sense(so, ub); 215 return (error); 216 } 217 218 /* 219 * MPALMOSTSAFE - acquires mplock 220 */ 221 int 222 soo_close(struct file *fp) 223 { 224 int error; 225 226 get_mplock(); 227 fp->f_ops = &badfileops; 228 if (fp->f_data) 229 error = soclose((struct socket *)fp->f_data, fp->f_flag); 230 else 231 error = 0; 232 fp->f_data = NULL; 233 rel_mplock(); 234 return (error); 235 } 236 237 /* 238 * MPALMOSTSAFE - acquires mplock 239 */ 240 int 241 soo_shutdown(struct file *fp, int how) 242 { 243 int error; 244 245 get_mplock(); 246 if (fp->f_data) 247 error = soshutdown((struct socket *)fp->f_data, how); 248 else 249 error = 0; 250 rel_mplock(); 251 return (error); 252 } 253 254