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/route.h> 54 55 struct fileops socketops = { 56 .fo_read = soo_read, 57 .fo_write = soo_write, 58 .fo_ioctl = soo_ioctl, 59 .fo_kqfilter = sokqfilter, 60 .fo_stat = soo_stat, 61 .fo_close = soo_close, 62 .fo_shutdown = soo_shutdown 63 }; 64 65 /* 66 * MPSAFE 67 */ 68 int 69 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 70 { 71 struct socket *so; 72 int error; 73 int msgflags; 74 75 atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC); 76 77 so = (struct socket *)fp->f_data; 78 79 if (fflags & O_FBLOCKING) 80 msgflags = 0; 81 else if (fflags & O_FNONBLOCKING) 82 msgflags = MSG_FNONBLOCKING; 83 else if (fp->f_flag & FNONBLOCK) 84 msgflags = MSG_FNONBLOCKING; 85 else 86 msgflags = 0; 87 88 error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags); 89 return (error); 90 } 91 92 /* 93 * MPSAFE 94 */ 95 int 96 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 97 { 98 struct socket *so; 99 int error; 100 int msgflags; 101 102 so = (struct socket *)fp->f_data; 103 104 if (fflags & O_FBLOCKING) 105 msgflags = 0; 106 else if (fflags & O_FNONBLOCKING) 107 msgflags = MSG_FNONBLOCKING; 108 else if (fp->f_flag & FNONBLOCK) 109 msgflags = MSG_FNONBLOCKING; 110 else 111 msgflags = 0; 112 113 error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td); 114 if (error == EPIPE && !(fflags & MSG_NOSIGNAL) && 115 !(so->so_options & SO_NOSIGPIPE) && 116 uio->uio_td->td_lwp) { 117 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE); 118 } 119 return (error); 120 } 121 122 /* 123 * MPSAFE 124 */ 125 int 126 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, 127 struct ucred *cred, struct sysmsg *msg) 128 { 129 struct socket *so; 130 int error; 131 132 so = (struct socket *)fp->f_data; 133 134 switch (cmd) { 135 case FIONBIO: 136 error = 0; 137 break; 138 case FIOASYNC: 139 if (*(int *)data) { 140 sosetstate(so, SS_ASYNC); 141 atomic_set_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 142 atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC); 143 } else { 144 soclrstate(so, SS_ASYNC); 145 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 146 atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC); 147 } 148 error = 0; 149 break; 150 case FIONREAD: 151 *(int *)data = so->so_rcv.ssb_cc; 152 error = 0; 153 break; 154 case FIOSETOWN: 155 error = fsetown(*(int *)data, &so->so_sigio); 156 break; 157 case FIOGETOWN: 158 *(int *)data = fgetown(&so->so_sigio); 159 error = 0; 160 break; 161 case SIOCSPGRP: 162 error = fsetown(-(*(int *)data), &so->so_sigio); 163 break; 164 case SIOCGPGRP: 165 *(int *)data = -fgetown(&so->so_sigio); 166 error = 0; 167 break; 168 case SIOCATMARK: 169 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 170 error = 0; 171 break; 172 default: 173 /* 174 * Interface/routing/protocol specific ioctls: 175 * interface and routing ioctls should have a 176 * different entry since a socket's unnecessary 177 */ 178 if (IOCGROUP(cmd) == 'i') { 179 error = ifioctl(so, cmd, data, cred); 180 } else if (IOCGROUP(cmd) == 'r') { 181 error = rtioctl(cmd, data, cred); 182 } else { 183 error = so_pru_control_direct(so, cmd, data, NULL); 184 } 185 break; 186 } 187 return (error); 188 } 189 190 /* 191 * MPSAFE 192 */ 193 int 194 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred) 195 { 196 struct socket *so; 197 int error; 198 199 bzero((caddr_t)ub, sizeof (*ub)); 200 ub->st_mode = S_IFSOCK; 201 so = (struct socket *)fp->f_data; 202 203 /* 204 * If SS_CANTRCVMORE is set, but there's still data left in the 205 * receive buffer, the socket is still readable. 206 */ 207 if ((so->so_state & SS_CANTRCVMORE) == 0 || 208 so->so_rcv.ssb_cc != 0) 209 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 210 if ((so->so_state & SS_CANTSENDMORE) == 0) 211 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 212 ub->st_size = so->so_rcv.ssb_cc; 213 ub->st_uid = so->so_cred->cr_uid; 214 ub->st_gid = so->so_cred->cr_gid; 215 error = so_pru_sense(so, ub); 216 return (error); 217 } 218 219 /* 220 * MPSAFE 221 */ 222 int 223 soo_close(struct file *fp) 224 { 225 int error; 226 227 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 return (error); 234 } 235 236 /* 237 * MPSAFE 238 */ 239 int 240 soo_shutdown(struct file *fp, int how) 241 { 242 int error; 243 244 if (fp->f_data) 245 error = soshutdown((struct socket *)fp->f_data, how); 246 else 247 error = 0; 248 return (error); 249 } 250 251