1 /* $OpenBSD: sys_socket.c,v 1.67 2024/12/30 02:46:00 guenther 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 49 const 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 58 int 59 soo_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 70 int 71 soo_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 82 int 83 soo_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 FIOASYNC: 90 solock(so); 91 mtx_enter(&so->so_rcv.sb_mtx); 92 mtx_enter(&so->so_snd.sb_mtx); 93 if (*(int *)data) { 94 so->so_rcv.sb_flags |= SB_ASYNC; 95 so->so_snd.sb_flags |= SB_ASYNC; 96 } else { 97 so->so_rcv.sb_flags &= ~SB_ASYNC; 98 so->so_snd.sb_flags &= ~SB_ASYNC; 99 } 100 mtx_leave(&so->so_snd.sb_mtx); 101 mtx_leave(&so->so_rcv.sb_mtx); 102 sounlock(so); 103 break; 104 105 case FIONREAD: 106 *(int *)data = so->so_rcv.sb_datacc; 107 break; 108 109 case FIOSETOWN: 110 case SIOCSPGRP: 111 case TIOCSPGRP: 112 return sigio_setown(&so->so_sigio, cmd, data); 113 114 case FIOGETOWN: 115 case SIOCGPGRP: 116 case TIOCGPGRP: 117 sigio_getown(&so->so_sigio, cmd, data); 118 break; 119 120 case SIOCATMARK: 121 *(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0; 122 break; 123 124 default: 125 /* 126 * Interface/routing/protocol specific ioctls: 127 * interface and routing ioctls should have a 128 * different entry since a socket's unnecessary 129 */ 130 if (IOCGROUP(cmd) == 'i') 131 return ifioctl(so, cmd, data, p); 132 if (IOCGROUP(cmd) == 'r') 133 return (EOPNOTSUPP); 134 return pru_control(so, cmd, data, NULL); 135 } 136 137 return (0); 138 } 139 140 int 141 soo_stat(struct file *fp, struct stat *ub, struct proc *p) 142 { 143 struct socket *so = fp->f_data; 144 145 memset(ub, 0, sizeof (*ub)); 146 ub->st_mode = S_IFSOCK; 147 solock_shared(so); 148 mtx_enter(&so->so_rcv.sb_mtx); 149 if ((so->so_rcv.sb_state & SS_CANTRCVMORE) == 0 || 150 so->so_rcv.sb_cc != 0) 151 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 152 mtx_leave(&so->so_rcv.sb_mtx); 153 mtx_enter(&so->so_snd.sb_mtx); 154 if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0) 155 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 156 mtx_leave(&so->so_snd.sb_mtx); 157 ub->st_uid = so->so_euid; 158 ub->st_gid = so->so_egid; 159 (void)pru_sense(so, ub); 160 sounlock_shared(so); 161 return (0); 162 } 163 164 int 165 soo_close(struct file *fp, struct proc *p) 166 { 167 int flags, error = 0; 168 169 if (fp->f_data) { 170 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0; 171 error = soclose(fp->f_data, flags); 172 } 173 fp->f_data = NULL; 174 return (error); 175 } 176