1 /* $OpenBSD: sys_socket.c,v 1.51 2022/06/20 01:39:44 visa Exp $ */ 2 /* $NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/file.h> 38 #include <sys/proc.h> 39 #include <sys/mbuf.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/ioctl.h> 44 #include <sys/stat.h> 45 #include <sys/fcntl.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 const struct fileops socketops = { 51 .fo_read = soo_read, 52 .fo_write = soo_write, 53 .fo_ioctl = soo_ioctl, 54 .fo_kqfilter = soo_kqfilter, 55 .fo_stat = soo_stat, 56 .fo_close = soo_close 57 }; 58 59 int 60 soo_read(struct file *fp, struct uio *uio, int fflags) 61 { 62 struct socket *so = (struct socket *)fp->f_data; 63 int flags = 0; 64 65 if (fp->f_flag & FNONBLOCK) 66 flags |= MSG_DONTWAIT; 67 68 return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0)); 69 } 70 71 int 72 soo_write(struct file *fp, struct uio *uio, int fflags) 73 { 74 struct socket *so = (struct socket *)fp->f_data; 75 int flags = 0; 76 77 if (fp->f_flag & FNONBLOCK) 78 flags |= MSG_DONTWAIT; 79 80 return (sosend(so, NULL, uio, NULL, NULL, flags)); 81 } 82 83 int 84 soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p) 85 { 86 struct socket *so = (struct socket *)fp->f_data; 87 int error = 0; 88 89 switch (cmd) { 90 91 case FIONBIO: 92 break; 93 94 case FIOASYNC: 95 solock(so); 96 if (*(int *)data) { 97 so->so_rcv.sb_flags |= SB_ASYNC; 98 so->so_snd.sb_flags |= SB_ASYNC; 99 } else { 100 so->so_rcv.sb_flags &= ~SB_ASYNC; 101 so->so_snd.sb_flags &= ~SB_ASYNC; 102 } 103 sounlock(so); 104 break; 105 106 case FIONREAD: 107 *(int *)data = so->so_rcv.sb_datacc; 108 break; 109 110 case FIOSETOWN: 111 case SIOCSPGRP: 112 case TIOCSPGRP: 113 error = sigio_setown(&so->so_sigio, cmd, data); 114 break; 115 116 case FIOGETOWN: 117 case SIOCGPGRP: 118 case TIOCGPGRP: 119 sigio_getown(&so->so_sigio, cmd, data); 120 break; 121 122 case SIOCATMARK: 123 *(int *)data = (so->so_state&SS_RCVATMARK) != 0; 124 break; 125 126 default: 127 /* 128 * Interface/routing/protocol specific ioctls: 129 * interface and routing ioctls should have a 130 * different entry since a socket's unnecessary 131 */ 132 if (IOCGROUP(cmd) == 'i') { 133 KERNEL_LOCK(); 134 error = ifioctl(so, cmd, data, p); 135 KERNEL_UNLOCK(); 136 return (error); 137 } 138 if (IOCGROUP(cmd) == 'r') 139 return (EOPNOTSUPP); 140 KERNEL_LOCK(); 141 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 142 (struct mbuf *)cmd, (struct mbuf *)data, NULL, p)); 143 KERNEL_UNLOCK(); 144 break; 145 } 146 147 return (error); 148 } 149 150 int 151 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 152 { 153 struct socket *so = fp->f_data; 154 155 memset(ub, 0, sizeof (*ub)); 156 ub->st_mode = S_IFSOCK; 157 solock(so); 158 if ((so->so_state & SS_CANTRCVMORE) == 0 || so->so_rcv.sb_cc != 0) 159 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 160 if ((so->so_state & SS_CANTSENDMORE) == 0) 161 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 162 ub->st_uid = so->so_euid; 163 ub->st_gid = so->so_egid; 164 (void) ((*so->so_proto->pr_usrreq)(so, PRU_SENSE, 165 (struct mbuf *)ub, NULL, NULL, p)); 166 sounlock(so); 167 return (0); 168 } 169 170 int 171 soo_close(struct file *fp, struct proc *p) 172 { 173 int flags, error = 0; 174 175 if (fp->f_data) { 176 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0; 177 error = soclose(fp->f_data, flags); 178 } 179 fp->f_data = NULL; 180 return (error); 181 } 182