sys_socket.c revision 1.51
1 /* $NetBSD: sys_socket.c,v 1.51 2007/07/09 21:10:56 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)sys_socket.c 8.3 (Berkeley) 2/14/95 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.51 2007/07/09 21:10:56 ad Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/systm.h> 40 #include <sys/file.h> 41 #include <sys/mbuf.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/ioctl.h> 46 #include <sys/stat.h> 47 #include <sys/poll.h> 48 #include <sys/proc.h> 49 #include <sys/kauth.h> 50 51 #include <net/if.h> 52 #include <net/route.h> 53 54 struct fileops socketops = { 55 soo_read, soo_write, soo_ioctl, soo_fcntl, soo_poll, 56 soo_stat, soo_close, soo_kqfilter 57 }; 58 59 /* ARGSUSED */ 60 int 61 soo_read(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 62 int flags) 63 { 64 struct socket *so = (struct socket *) fp->f_data; 65 int error; 66 67 KERNEL_LOCK(1, curlwp); 68 error = (*so->so_receive)(so, (struct mbuf **)0, 69 uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0); 70 KERNEL_UNLOCK_ONE(curlwp); 71 72 return error; 73 } 74 75 /* ARGSUSED */ 76 int 77 soo_write(struct file *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, 78 int flags) 79 { 80 struct socket *so = (struct socket *) fp->f_data; 81 int error; 82 83 KERNEL_LOCK(1, curlwp); 84 error = (*so->so_send)(so, (struct mbuf *)0, 85 uio, (struct mbuf *)0, (struct mbuf *)0, 0, curlwp); 86 KERNEL_UNLOCK_ONE(curlwp); 87 88 return error; 89 } 90 91 int 92 soo_ioctl(struct file *fp, u_long cmd, void *data, struct lwp *l) 93 { 94 struct socket *so = (struct socket *)fp->f_data; 95 struct proc *p = l->l_proc; 96 int error = 0; 97 98 KERNEL_LOCK(1, curlwp); 99 100 switch (cmd) { 101 102 case FIONBIO: 103 if (*(int *)data) 104 so->so_state |= SS_NBIO; 105 else 106 so->so_state &= ~SS_NBIO; 107 break; 108 109 case FIOASYNC: 110 if (*(int *)data) { 111 so->so_state |= SS_ASYNC; 112 so->so_rcv.sb_flags |= SB_ASYNC; 113 so->so_snd.sb_flags |= SB_ASYNC; 114 } else { 115 so->so_state &= ~SS_ASYNC; 116 so->so_rcv.sb_flags &= ~SB_ASYNC; 117 so->so_snd.sb_flags &= ~SB_ASYNC; 118 } 119 break; 120 121 case FIONREAD: 122 *(int *)data = so->so_rcv.sb_cc; 123 break; 124 125 case FIONWRITE: 126 *(int *)data = so->so_snd.sb_cc; 127 break; 128 129 case FIONSPACE: 130 /* 131 * See the comment around sbspace()'s definition 132 * in sys/socketvar.h in face of counts about maximum 133 * to understand the following test. We detect overflow 134 * and return zero. 135 */ 136 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 137 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 138 *(int *)data = 0; 139 else 140 *(int *)data = sbspace(&so->so_snd); 141 break; 142 143 case SIOCSPGRP: 144 case FIOSETOWN: 145 case TIOCSPGRP: 146 error = fsetown(p, &so->so_pgid, cmd, data); 147 break; 148 149 case SIOCGPGRP: 150 case FIOGETOWN: 151 case TIOCGPGRP: 152 error = fgetown(p, so->so_pgid, cmd, data); 153 break; 154 155 case SIOCATMARK: 156 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 157 break; 158 159 default: 160 /* 161 * Interface/routing/protocol specific ioctls: 162 * interface and routing ioctls should have a 163 * different entry since a socket's unnecessary 164 */ 165 if (IOCGROUP(cmd) == 'i') 166 error = ifioctl(so, cmd, data, l); 167 else if (IOCGROUP(cmd) == 'r') 168 error = rtioctl(cmd, data, l); 169 else 170 error = (*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 171 (struct mbuf *)cmd, (struct mbuf *)data, NULL, l); 172 break; 173 } 174 175 KERNEL_UNLOCK_ONE(curlwp); 176 177 return error; 178 } 179 180 int 181 soo_fcntl(struct file *fp, u_int cmd, void *data, struct lwp *l) 182 { 183 184 if (cmd == F_SETFL) 185 return 0; 186 else 187 return EOPNOTSUPP; 188 } 189 190 int 191 soo_poll(struct file *fp, int events, struct lwp *l) 192 { 193 struct socket *so = (struct socket *)fp->f_data; 194 int revents = 0; 195 int s; 196 197 KERNEL_LOCK(1, curlwp); 198 s = splsoftnet(); 199 200 if (events & (POLLIN | POLLRDNORM)) 201 if (soreadable(so)) 202 revents |= events & (POLLIN | POLLRDNORM); 203 204 if (events & (POLLOUT | POLLWRNORM)) 205 if (sowritable(so)) 206 revents |= events & (POLLOUT | POLLWRNORM); 207 208 if (events & (POLLPRI | POLLRDBAND)) 209 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 210 revents |= events & (POLLPRI | POLLRDBAND); 211 212 if (revents == 0) { 213 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 214 selrecord(l, &so->so_rcv.sb_sel); 215 so->so_rcv.sb_flags |= SB_SEL; 216 } 217 218 if (events & (POLLOUT | POLLWRNORM)) { 219 selrecord(l, &so->so_snd.sb_sel); 220 so->so_snd.sb_flags |= SB_SEL; 221 } 222 } 223 224 splx(s); 225 KERNEL_UNLOCK_ONE(curlwp); 226 227 return revents; 228 } 229 230 int 231 soo_stat(struct file *fp, struct stat *ub, struct lwp *l) 232 { 233 struct socket *so = (struct socket *)fp->f_data; 234 int error; 235 236 memset((void *)ub, 0, sizeof(*ub)); 237 ub->st_mode = S_IFSOCK; 238 239 KERNEL_LOCK(1, curlwp); 240 error = (*so->so_proto->pr_usrreq)(so, PRU_SENSE, 241 (struct mbuf *)ub, (struct mbuf *)0, (struct mbuf *)0, l); 242 KERNEL_UNLOCK_ONE(curlwp); 243 244 return error; 245 } 246 247 /* ARGSUSED */ 248 int 249 soo_close(struct file *fp, struct lwp *l) 250 { 251 int error = 0; 252 253 KERNEL_LOCK(1, curlwp); 254 if (fp->f_data) 255 error = soclose((struct socket *)fp->f_data); 256 fp->f_data = 0; 257 KERNEL_UNLOCK_ONE(curlwp); 258 259 return error; 260 } 261
Indexes created Tue Sep 23 01:09:51 GMT 2025