Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * NET4:	Sysctl interface to net af_unix subsystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Authors:	Mike Shaver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sysctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <net/af_unix.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static struct ctl_table unix_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		.procname	= "max_dgram_qlen",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		.data		= &init_net.unx.sysctl_max_dgram_qlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		.maxlen		= sizeof(int),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		.mode		= 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		.proc_handler	= proc_dointvec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int __net_init unix_sysctl_register(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	struct ctl_table *table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	if (table == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	/* Don't export sysctls to unprivileged users */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (net->user_ns != &init_user_ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		table[0].procname = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	table[0].data = &net->unx.sysctl_max_dgram_qlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	net->unx.ctl = register_net_sysctl(net, "net/unix", table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (net->unx.ctl == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		goto err_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) err_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	kfree(table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) err_alloc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) void unix_sysctl_unregister(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	struct ctl_table *table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	table = net->unx.ctl->ctl_table_arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	unregister_net_sysctl_table(net->unx.ctl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	kfree(table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }