sys_socket.c revision 1.52
1 /* $NetBSD: sys_socket.c,v 1.52 2008/02/06 21:57:54 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 1.52 2008/02/06 21:57:54 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 if (cmd == FIONBIO) { 99 so->so_nbio = *(int *)data; 100 return 0; 101 } 102 103 KERNEL_LOCK(1, curlwp); 104 105 switch (cmd) { 106 107 case FIOASYNC: 108 if (*(int *)data) { 109 so->so_state |= SS_ASYNC; 110 so->so_rcv.sb_flags |= SB_ASYNC; 111 so->so_snd.sb_flags |= SB_ASYNC; 112 } else { 113 so->so_state &= ~SS_ASYNC; 114 so->so_rcv.sb_flags &= ~SB_ASYNC; 115 so->so_snd.sb_flags &= ~SB_ASYNC; 116 } 117 break; 118 119 case FIONREAD: 120 *(int *)data = so->so_rcv.sb_cc; 121 break; 122 123 case FIONWRITE: 124 *(int *)data = so->so_snd.sb_cc; 125 break; 126 127 case FIONSPACE: 128 /* 129 * See the comment around sbspace()'s definition 130 * in sys/socketvar.h in face of counts about maximum 131 * to understand the following test. We detect overflow 132 * and return zero. 133 */ 134 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 135 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 136 *(int *)data = 0; 137 else 138 *(int *)data = sbspace(&so->so_snd); 139 break; 140 141 case SIOCSPGRP: 142 case FIOSETOWN: 143 case TIOCSPGRP: 144 error = fsetown(p, &so->so_pgid, cmd, data); 145 break; 146 147 case SIOCGPGRP: 148 case FIOGETOWN: 149 case TIOCGPGRP: 150 error = fgetown(p, so->so_pgid, cmd, data); 151 break; 152 153 case SIOCATMARK: 154 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 155 break; 156 157 default: 158 /* 159 * Interface/routing/protocol specific ioctls: 160 * interface and routing ioctls should have a 161 * different entry since a socket's unnecessary 162 */ 163 if (IOCGROUP(cmd) == 'i') 164 error = ifioctl(so, cmd, data, l); 165 else if (IOCGROUP(cmd) == 'r') 166 error = rtioctl(cmd, data, l); 167 else 168 error = (*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 169 (struct mbuf *)cmd, (struct mbuf *)data, NULL, l); 170 break; 171 } 172 173 KERNEL_UNLOCK_ONE(curlwp); 174 175 return error; 176 } 177 178 int 179 soo_fcntl(struct file *fp, u_int cmd, void *data, struct lwp *l) 180 { 181 182 if (cmd == F_SETFL) 183 return 0; 184 else 185 return EOPNOTSUPP; 186 } 187 188 int 189 soo_poll(struct file *fp, int events, struct lwp *l) 190 { 191 struct socket *so = (struct socket *)fp->f_data; 192 int revents = 0; 193 int s; 194 195 KERNEL_LOCK(1, curlwp); 196 s = splsoftnet(); 197 198 if (events & (POLLIN | POLLRDNORM)) 199 if (soreadable(so)) 200 revents |= events & (POLLIN | POLLRDNORM); 201 202 if (events & (POLLOUT | POLLWRNORM)) 203 if (sowritable(so)) 204 revents |= events & (POLLOUT | POLLWRNORM); 205 206 if (events & (POLLPRI | POLLRDBAND)) 207 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 208 revents |= events & (POLLPRI | POLLRDBAND); 209 210 if (revents == 0) { 211 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 212 selrecord(l, &so->so_rcv.sb_sel); 213 so->so_rcv.sb_flags |= SB_SEL; 214 } 215 216 if (events & (POLLOUT | POLLWRNORM)) { 217 selrecord(l, &so->so_snd.sb_sel); 218 so->so_snd.sb_flags |= SB_SEL; 219 } 220 } 221 222 splx(s); 223 KERNEL_UNLOCK_ONE(curlwp); 224 225 return revents; 226 } 227 228 int 229 soo_stat(struct file *fp, struct stat *ub, struct lwp *l) 230 { 231 struct socket *so = (struct socket *)fp->f_data; 232 int error; 233 234 memset((void *)ub, 0, sizeof(*ub)); 235 ub->st_mode = S_IFSOCK; 236 237 KERNEL_LOCK(1, curlwp); 238 error = (*so->so_proto->pr_usrreq)(so, PRU_SENSE, 239 (struct mbuf *)ub, (struct mbuf *)0, (struct mbuf *)0, l); 240 KERNEL_UNLOCK_ONE(curlwp); 241 242 return error; 243 } 244 245 /* ARGSUSED */ 246 int 247 soo_close(struct file *fp, struct lwp *l) 248 { 249 int error = 0; 250 251 KERNEL_LOCK(1, curlwp); 252 if (fp->f_data) 253 error = soclose((struct socket *)fp->f_data); 254 fp->f_data = 0; 255 KERNEL_UNLOCK_ONE(curlwp); 256 257 return error; 258 } 259
Indexes created Mon Sep 22 05:09:51 GMT 2025