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. 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 * $FreeBSD: src/sys/kern/sys_socket.c,v 1.28.2.2 2001/02/26 04:23:16 jlemon Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/file.h> 36 #include <sys/lock.h> 37 #include <sys/protosw.h> 38 #include <sys/signalvar.h> 39 #include <sys/socket.h> 40 #include <sys/socketvar.h> 41 #include <sys/socketops.h> 42 #include <sys/filio.h> /* XXX */ 43 #include <sys/sockio.h> 44 #include <sys/vnode.h> 45 #include <sys/stat.h> 46 #include <sys/uio.h> 47 #include <sys/filedesc.h> 48 #include <sys/ucred.h> 49 50 #include <sys/socketvar2.h> 51 52 #include <net/if.h> 53 #include <net/if_var.h> 54 #include <net/route.h> 55 56 struct fileops socketops = { 57 .fo_read = soo_read, 58 .fo_write = soo_write, 59 .fo_ioctl = soo_ioctl, 60 .fo_kqfilter = sokqfilter, 61 .fo_stat = soo_stat, 62 .fo_close = soo_close, 63 .fo_shutdown = soo_shutdown 64 }; 65 66 /* 67 * MPSAFE 68 */ 69 int 70 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 71 { 72 struct socket *so; 73 int error; 74 int msgflags; 75 76 atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC); 77 78 so = (struct socket *)fp->f_data; 79 80 if (fflags & O_FBLOCKING) 81 msgflags = 0; 82 else if (fflags & O_FNONBLOCKING) 83 msgflags = MSG_FNONBLOCKING; 84 else if (fp->f_flag & FNONBLOCK) 85 msgflags = MSG_FNONBLOCKING; 86 else 87 msgflags = 0; 88 89 error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags); 90 return (error); 91 } 92 93 /* 94 * MPSAFE 95 */ 96 int 97 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 98 { 99 struct socket *so; 100 int error; 101 int msgflags; 102 103 so = (struct socket *)fp->f_data; 104 105 if (fflags & O_FBLOCKING) 106 msgflags = 0; 107 else if (fflags & O_FNONBLOCKING) 108 msgflags = MSG_FNONBLOCKING; 109 else if (fp->f_flag & FNONBLOCK) 110 msgflags = MSG_FNONBLOCKING; 111 else 112 msgflags = 0; 113 114 error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td); 115 if (error == EPIPE && !(fflags & MSG_NOSIGNAL) && 116 !(so->so_options & SO_NOSIGPIPE) && 117 uio->uio_td->td_lwp) { 118 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE); 119 } 120 return (error); 121 } 122 123 /* 124 * MPSAFE 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 so = (struct socket *)fp->f_data; 134 135 switch (cmd) { 136 case FIONBIO: 137 error = 0; 138 break; 139 case FIOASYNC: 140 if (*(int *)data) { 141 sosetstate(so, SS_ASYNC); 142 atomic_set_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 143 atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC); 144 } else { 145 soclrstate(so, SS_ASYNC); 146 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 147 atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC); 148 } 149 error = 0; 150 break; 151 case FIONREAD: 152 *(int *)data = so->so_rcv.ssb_cc; 153 error = 0; 154 break; 155 case FIOSETOWN: 156 error = fsetown(*(int *)data, &so->so_sigio); 157 break; 158 case FIOGETOWN: 159 *(int *)data = fgetown(&so->so_sigio); 160 error = 0; 161 break; 162 case SIOCSPGRP: 163 error = fsetown(-(*(int *)data), &so->so_sigio); 164 break; 165 case SIOCGPGRP: 166 *(int *)data = -fgetown(&so->so_sigio); 167 error = 0; 168 break; 169 case SIOCATMARK: 170 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 171 error = 0; 172 break; 173 default: 174 /* 175 * Interface/routing/protocol specific ioctls: 176 * interface and routing ioctls should have a 177 * different entry since a socket's unnecessary 178 */ 179 if (IOCGROUP(cmd) == 'i') { 180 error = ifioctl(so, cmd, data, cred); 181 } else if (IOCGROUP(cmd) == 'r') { 182 error = rtioctl(cmd, data, cred); 183 } else { 184 error = so_pru_control_direct(so, cmd, data, NULL); 185 } 186 break; 187 } 188 return (error); 189 } 190 191 /* 192 * MPSAFE 193 */ 194 int 195 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred) 196 { 197 struct socket *so; 198 int error; 199 200 bzero((caddr_t)ub, sizeof (*ub)); 201 ub->st_mode = S_IFSOCK; 202 so = (struct socket *)fp->f_data; 203 204 /* 205 * If SS_CANTRCVMORE is set, but there's still data left in the 206 * receive buffer, the socket is still readable. 207 */ 208 if ((so->so_state & SS_CANTRCVMORE) == 0 || 209 so->so_rcv.ssb_cc != 0) 210 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 211 if ((so->so_state & SS_CANTSENDMORE) == 0) 212 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 213 ub->st_size = so->so_rcv.ssb_cc; 214 ub->st_uid = so->so_cred->cr_uid; 215 ub->st_gid = so->so_cred->cr_gid; 216 ub->st_ino = so->so_inum; 217 error = so_pru_sense(so, ub); 218 219 return (error); 220 } 221 222 /* 223 * MPSAFE 224 */ 225 int 226 soo_close(struct file *fp) 227 { 228 int error; 229 230 fp->f_ops = &badfileops; 231 if (fp->f_data) 232 error = soclose((struct socket *)fp->f_data, fp->f_flag); 233 else 234 error = 0; 235 fp->f_data = NULL; 236 return (error); 237 } 238 239 /* 240 * MPSAFE 241 */ 242 int 243 soo_shutdown(struct file *fp, int how) 244 { 245 int error; 246 247 if (fp->f_data) 248 error = soshutdown((struct socket *)fp->f_data, how); 249 else 250 error = 0; 251 return (error); 252 } 253 254