1 /* $NetBSD: sys_socket.c,v 1.48 2006/10/12 01:32:18 christos 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 1.48 2006/10/12 01:32:18 christos Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/file.h> 40 #include <sys/mbuf.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/ioctl.h> 45 #include <sys/stat.h> 46 #include <sys/poll.h> 47 #include <sys/proc.h> 48 #include <sys/kauth.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 53 struct fileops socketops = { 54 soo_read, soo_write, soo_ioctl, soo_fcntl, soo_poll, 55 soo_stat, soo_close, soo_kqfilter 56 }; 57 58 /* ARGSUSED */ 59 int 60 soo_read(struct file *fp, off_t *offset __unused, struct uio *uio, 61 kauth_cred_t cred __unused, int flags __unused) 62 { 63 struct socket *so = (struct socket *) fp->f_data; 64 return ((*so->so_receive)(so, (struct mbuf **)0, 65 uio, (struct mbuf **)0, (struct mbuf **)0, (int *)0)); 66 } 67 68 /* ARGSUSED */ 69 int 70 soo_write(struct file *fp, off_t *offset __unused, struct uio *uio, 71 kauth_cred_t cred __unused, int flags __unused) 72 { 73 struct socket *so = (struct socket *) fp->f_data; 74 return (*so->so_send)(so, (struct mbuf *)0, 75 uio, (struct mbuf *)0, (struct mbuf *)0, 0, curlwp); 76 } 77 78 int 79 soo_ioctl(struct file *fp, u_long cmd, void *data, struct lwp *l) 80 { 81 struct socket *so = (struct socket *)fp->f_data; 82 struct proc *p = l->l_proc; 83 84 switch (cmd) { 85 86 case FIONBIO: 87 if (*(int *)data) 88 so->so_state |= SS_NBIO; 89 else 90 so->so_state &= ~SS_NBIO; 91 return (0); 92 93 case FIOASYNC: 94 if (*(int *)data) { 95 so->so_state |= SS_ASYNC; 96 so->so_rcv.sb_flags |= SB_ASYNC; 97 so->so_snd.sb_flags |= SB_ASYNC; 98 } else { 99 so->so_state &= ~SS_ASYNC; 100 so->so_rcv.sb_flags &= ~SB_ASYNC; 101 so->so_snd.sb_flags &= ~SB_ASYNC; 102 } 103 return (0); 104 105 case FIONREAD: 106 *(int *)data = so->so_rcv.sb_cc; 107 return (0); 108 109 case FIONWRITE: 110 *(int *)data = so->so_snd.sb_cc; 111 return (0); 112 113 case FIONSPACE: 114 /* 115 * See the comment around sbspace()'s definition 116 * in sys/socketvar.h in face of counts about maximum 117 * to understand the following test. We detect overflow 118 * and return zero. 119 */ 120 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) 121 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 122 *(int *)data = 0; 123 else 124 *(int *)data = sbspace(&so->so_snd); 125 return (0); 126 127 case SIOCSPGRP: 128 case FIOSETOWN: 129 case TIOCSPGRP: 130 return fsetown(p, &so->so_pgid, cmd, data); 131 132 case SIOCGPGRP: 133 case FIOGETOWN: 134 case TIOCGPGRP: 135 return fgetown(p, so->so_pgid, cmd, data); 136 137 case SIOCATMARK: 138 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 139 return (0); 140 } 141 /* 142 * Interface/routing/protocol specific ioctls: 143 * interface and routing ioctls should have a 144 * different entry since a socket's unnecessary 145 */ 146 if (IOCGROUP(cmd) == 'i') 147 return (ifioctl(so, cmd, data, l)); 148 if (IOCGROUP(cmd) == 'r') 149 return (rtioctl(cmd, data, l)); 150 return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 151 (struct mbuf *)cmd, (struct mbuf *)data, (struct mbuf *)0, l)); 152 } 153 154 int 155 soo_fcntl(struct file *fp __unused, u_int cmd, void *data __unused, 156 struct lwp *l __unused) 157 { 158 if (cmd == F_SETFL) 159 return (0); 160 else 161 return (EOPNOTSUPP); 162 } 163 164 int 165 soo_poll(struct file *fp, int events, struct lwp *l) 166 { 167 struct socket *so = (struct socket *)fp->f_data; 168 int revents = 0; 169 int s = splsoftnet(); 170 171 if (events & (POLLIN | POLLRDNORM)) 172 if (soreadable(so)) 173 revents |= events & (POLLIN | POLLRDNORM); 174 175 if (events & (POLLOUT | POLLWRNORM)) 176 if (sowritable(so)) 177 revents |= events & (POLLOUT | POLLWRNORM); 178 179 if (events & (POLLPRI | POLLRDBAND)) 180 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 181 revents |= events & (POLLPRI | POLLRDBAND); 182 183 if (revents == 0) { 184 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 185 selrecord(l, &so->so_rcv.sb_sel); 186 so->so_rcv.sb_flags |= SB_SEL; 187 } 188 189 if (events & (POLLOUT | POLLWRNORM)) { 190 selrecord(l, &so->so_snd.sb_sel); 191 so->so_snd.sb_flags |= SB_SEL; 192 } 193 } 194 195 splx(s); 196 return (revents); 197 } 198 199 int 200 soo_stat(struct file *fp, struct stat *ub, struct lwp *l) 201 { 202 struct socket *so = (struct socket *)fp->f_data; 203 204 memset((caddr_t)ub, 0, sizeof(*ub)); 205 ub->st_mode = S_IFSOCK; 206 return ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 207 (struct mbuf *)ub, (struct mbuf *)0, (struct mbuf *)0, l)); 208 } 209 210 /* ARGSUSED */ 211 int 212 soo_close(struct file *fp, struct lwp *l __unused) 213 { 214 int error = 0; 215 216 if (fp->f_data) 217 error = soclose((struct socket *)fp->f_data); 218 fp->f_data = 0; 219 return (error); 220 } 221