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 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE); 117 return (error); 118 } 119 120 /* 121 * MPSAFE 122 */ 123 int 124 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, 125 struct ucred *cred, struct sysmsg *msg) 126 { 127 struct socket *so; 128 int error; 129 130 so = (struct socket *)fp->f_data; 131 132 switch (cmd) { 133 case FIOASYNC: 134 if (*(int *)data) { 135 sosetstate(so, SS_ASYNC); 136 atomic_set_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 137 atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC); 138 } else { 139 soclrstate(so, SS_ASYNC); 140 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 141 atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC); 142 } 143 error = 0; 144 break; 145 case FIONREAD: 146 *(int *)data = so->so_rcv.ssb_cc; 147 error = 0; 148 break; 149 case FIOSETOWN: 150 error = fsetown(*(int *)data, &so->so_sigio); 151 break; 152 case FIOGETOWN: 153 *(int *)data = fgetown(&so->so_sigio); 154 error = 0; 155 break; 156 case SIOCSPGRP: 157 error = fsetown(-(*(int *)data), &so->so_sigio); 158 break; 159 case SIOCGPGRP: 160 *(int *)data = -fgetown(&so->so_sigio); 161 error = 0; 162 break; 163 case SIOCATMARK: 164 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 165 error = 0; 166 break; 167 default: 168 /* 169 * Interface/routing/protocol specific ioctls: 170 * interface and routing ioctls should have a 171 * different entry since a socket's unnecessary 172 */ 173 if (IOCGROUP(cmd) == 'i') { 174 error = ifioctl(so, cmd, data, cred); 175 } else if (IOCGROUP(cmd) == 'r') { 176 error = rtioctl(cmd, data, cred); 177 } else { 178 error = so_pru_control_direct(so, cmd, data, NULL); 179 } 180 break; 181 } 182 return (error); 183 } 184 185 /* 186 * MPSAFE 187 */ 188 int 189 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred) 190 { 191 struct socket *so; 192 int error; 193 194 bzero((caddr_t)ub, sizeof (*ub)); 195 ub->st_mode = S_IFSOCK; 196 so = (struct socket *)fp->f_data; 197 198 /* 199 * If SS_CANTRCVMORE is set, but there's still data left in the 200 * receive buffer, the socket is still readable. 201 */ 202 if ((so->so_state & SS_CANTRCVMORE) == 0 || 203 so->so_rcv.ssb_cc != 0) 204 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 205 if ((so->so_state & SS_CANTSENDMORE) == 0) 206 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 207 ub->st_size = so->so_rcv.ssb_cc; 208 ub->st_uid = so->so_cred->cr_uid; 209 ub->st_gid = so->so_cred->cr_gid; 210 error = so_pru_sense(so, ub); 211 return (error); 212 } 213 214 /* 215 * MPSAFE 216 */ 217 int 218 soo_close(struct file *fp) 219 { 220 int error; 221 222 fp->f_ops = &badfileops; 223 if (fp->f_data) 224 error = soclose((struct socket *)fp->f_data, fp->f_flag); 225 else 226 error = 0; 227 fp->f_data = NULL; 228 return (error); 229 } 230 231 /* 232 * MPSAFE 233 */ 234 int 235 soo_shutdown(struct file *fp, int how) 236 { 237 int error; 238 239 if (fp->f_data) 240 error = soshutdown((struct socket *)fp->f_data, how); 241 else 242 error = 0; 243 return (error); 244 } 245 246