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 .fo_seek = badfo_seek 65 }; 66 67 /* 68 * MPSAFE 69 */ 70 int 71 soo_read(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 72 { 73 struct socket *so; 74 int error; 75 int msgflags; 76 77 atomic_set_int(&curthread->td_mpflags, TDF_MP_BATCH_DEMARC); 78 79 so = (struct socket *)fp->f_data; 80 81 if (fflags & O_FBLOCKING) 82 msgflags = 0; 83 else if (fflags & O_FNONBLOCKING) 84 msgflags = MSG_FNONBLOCKING; 85 else if (fp->f_flag & FNONBLOCK) 86 msgflags = MSG_FNONBLOCKING; 87 else 88 msgflags = 0; 89 90 error = so_pru_soreceive(so, NULL, uio, NULL, NULL, &msgflags); 91 return (error); 92 } 93 94 /* 95 * MPSAFE 96 */ 97 int 98 soo_write(struct file *fp, struct uio *uio, struct ucred *cred, int fflags) 99 { 100 struct socket *so; 101 int error; 102 int msgflags; 103 104 so = (struct socket *)fp->f_data; 105 106 if (fflags & O_FBLOCKING) 107 msgflags = 0; 108 else if (fflags & O_FNONBLOCKING) 109 msgflags = MSG_FNONBLOCKING; 110 else if (fp->f_flag & FNONBLOCK) 111 msgflags = MSG_FNONBLOCKING; 112 else 113 msgflags = 0; 114 115 error = so_pru_sosend(so, NULL, uio, NULL, NULL, msgflags, uio->uio_td); 116 if (error == EPIPE && !(fflags & MSG_NOSIGNAL) && 117 !(so->so_options & SO_NOSIGPIPE) && 118 uio->uio_td->td_lwp) { 119 lwpsignal(uio->uio_td->td_proc, uio->uio_td->td_lwp, SIGPIPE); 120 } 121 return (error); 122 } 123 124 /* 125 * MPSAFE 126 */ 127 int 128 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, 129 struct ucred *cred, struct sysmsg *msg) 130 { 131 struct socket *so; 132 int error; 133 134 so = (struct socket *)fp->f_data; 135 136 switch (cmd) { 137 case FIONBIO: 138 error = 0; 139 break; 140 case FIOASYNC: 141 if (*(int *)data) { 142 sosetstate(so, SS_ASYNC); 143 atomic_set_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 144 atomic_set_int(&so->so_snd.ssb_flags, SSB_ASYNC); 145 } else { 146 soclrstate(so, SS_ASYNC); 147 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_ASYNC); 148 atomic_clear_int(&so->so_snd.ssb_flags, SSB_ASYNC); 149 } 150 error = 0; 151 break; 152 case FIONREAD: 153 *(int *)data = so->so_rcv.ssb_cc; 154 error = 0; 155 break; 156 case FIOSETOWN: 157 error = fsetown(*(int *)data, &so->so_sigio); 158 break; 159 case FIOGETOWN: 160 *(int *)data = fgetown(&so->so_sigio); 161 error = 0; 162 break; 163 case SIOCSPGRP: 164 error = fsetown(-(*(int *)data), &so->so_sigio); 165 break; 166 case SIOCGPGRP: 167 *(int *)data = -fgetown(&so->so_sigio); 168 error = 0; 169 break; 170 case SIOCATMARK: 171 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 172 error = 0; 173 break; 174 default: 175 /* 176 * Interface/routing/protocol specific ioctls: 177 * interface and routing ioctls should have a 178 * different entry since a socket's unnecessary 179 */ 180 if (IOCGROUP(cmd) == 'i') { 181 error = ifioctl(so, cmd, data, cred); 182 } else if (IOCGROUP(cmd) == 'r') { 183 error = rtioctl(cmd, data, cred); 184 } else { 185 error = so_pru_control_direct(so, cmd, data, NULL); 186 } 187 break; 188 } 189 return (error); 190 } 191 192 /* 193 * MPSAFE 194 */ 195 int 196 soo_stat(struct file *fp, struct stat *ub, struct ucred *cred) 197 { 198 struct socket *so; 199 int error; 200 201 bzero((caddr_t)ub, sizeof (*ub)); 202 ub->st_mode = S_IFSOCK; 203 so = (struct socket *)fp->f_data; 204 205 /* 206 * If SS_CANTRCVMORE is set, but there's still data left in the 207 * receive buffer, the socket is still readable. 208 */ 209 if ((so->so_state & SS_CANTRCVMORE) == 0 || 210 so->so_rcv.ssb_cc != 0) 211 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 212 if ((so->so_state & SS_CANTSENDMORE) == 0) 213 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 214 ub->st_size = so->so_rcv.ssb_cc; 215 ub->st_uid = so->so_cred->cr_uid; 216 ub->st_gid = so->so_cred->cr_gid; 217 ub->st_ino = so->so_inum; 218 error = so_pru_sense(so, ub); 219 220 return (error); 221 } 222 223 /* 224 * MPSAFE 225 */ 226 int 227 soo_close(struct file *fp) 228 { 229 int error; 230 231 fp->f_ops = &badfileops; 232 if (fp->f_data) 233 error = soclose((struct socket *)fp->f_data, fp->f_flag); 234 else 235 error = 0; 236 fp->f_data = NULL; 237 return (error); 238 } 239 240 /* 241 * MPSAFE 242 */ 243 int 244 soo_shutdown(struct file *fp, int how) 245 { 246 int error; 247 248 if (fp->f_data) 249 error = soshutdown((struct socket *)fp->f_data, how); 250 else 251 error = 0; 252 return (error); 253 } 254 255