1/* $OpenBSD: sys_socket.c,v 1.65 2024/04/30 17:59:15 mvs 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 49const struct fileops socketops = { 50 .fo_read = soo_read, 51 .fo_write = soo_write, 52 .fo_ioctl = soo_ioctl, 53 .fo_kqfilter = soo_kqfilter, 54 .fo_stat = soo_stat, 55 .fo_close = soo_close 56}; 57 58int 59soo_read(struct file *fp, struct uio *uio, int fflags) 60{ 61 struct socket *so = (struct socket *)fp->f_data; 62 int flags = 0; 63 64 if (fp->f_flag & FNONBLOCK) 65 flags |= MSG_DONTWAIT; 66 67 return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0)); 68} 69 70int 71soo_write(struct file *fp, struct uio *uio, int fflags) 72{ 73 struct socket *so = (struct socket *)fp->f_data; 74 int flags = 0; 75 76 if (fp->f_flag & FNONBLOCK) 77 flags |= MSG_DONTWAIT; 78 79 return (sosend(so, NULL, uio, NULL, NULL, flags)); 80} 81 82int 83soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p) 84{ 85 struct socket *so = (struct socket *)fp->f_data; 86 87 switch (cmd) { 88 89 case FIONBIO: 90 break; 91 92 case FIOASYNC: 93 solock(so); 94 mtx_enter(&so->so_rcv.sb_mtx); 95 mtx_enter(&so->so_snd.sb_mtx); 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 mtx_leave(&so->so_snd.sb_mtx); 104 mtx_leave(&so->so_rcv.sb_mtx); 105 sounlock(so); 106 break; 107 108 case FIONREAD: 109 *(int *)data = so->so_rcv.sb_datacc; 110 break; 111 112 case FIOSETOWN: 113 case SIOCSPGRP: 114 case TIOCSPGRP: 115 return sigio_setown(&so->so_sigio, cmd, data); 116 117 case FIOGETOWN: 118 case SIOCGPGRP: 119 case TIOCGPGRP: 120 sigio_getown(&so->so_sigio, cmd, data); 121 break; 122 123 case SIOCATMARK: 124 *(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0; 125 break; 126 127 default: 128 /* 129 * Interface/routing/protocol specific ioctls: 130 * interface and routing ioctls should have a 131 * different entry since a socket's unnecessary 132 */ 133 if (IOCGROUP(cmd) == 'i') 134 return ifioctl(so, cmd, data, p); 135 if (IOCGROUP(cmd) == 'r') 136 return (EOPNOTSUPP); 137 return pru_control(so, cmd, data, NULL); 138 } 139 140 return (0); 141} 142 143int 144soo_stat(struct file *fp, struct stat *ub, struct proc *p) 145{ 146 struct socket *so = fp->f_data; 147 148 memset(ub, 0, sizeof (*ub)); 149 ub->st_mode = S_IFSOCK; 150 solock_shared(so); 151 mtx_enter(&so->so_rcv.sb_mtx); 152 if ((so->so_rcv.sb_state & SS_CANTRCVMORE) == 0 || 153 so->so_rcv.sb_cc != 0) 154 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 155 mtx_leave(&so->so_rcv.sb_mtx); 156 if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0) 157 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 158 ub->st_uid = so->so_euid; 159 ub->st_gid = so->so_egid; 160 (void)pru_sense(so, ub); 161 sounlock_shared(so); 162 return (0); 163} 164 165int 166soo_close(struct file *fp, struct proc *p) 167{ 168 int flags, error = 0; 169 170 if (fp->f_data) { 171 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0; 172 error = soclose(fp->f_data, flags); 173 } 174 fp->f_data = NULL; 175 return (error); 176} 177