Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * File: sysctl.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Phonet /proc/sys/net/phonet interface implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 2008 Nokia Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Author: Rémi Denis-Courmont
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/seqlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sysctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <net/phonet/phonet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define DYNAMIC_PORT_MIN	0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define DYNAMIC_PORT_MAX	0x7f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static DEFINE_SEQLOCK(local_port_range_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static int local_port_range_min[2] = {0, 0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int local_port_range_max[2] = {1023, 1023};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static struct ctl_table_header *phonet_table_hrd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static void set_local_port_range(int range[2])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	write_seqlock(&local_port_range_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	local_port_range[0] = range[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	local_port_range[1] = range[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	write_sequnlock(&local_port_range_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void phonet_get_local_port_range(int *min, int *max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	unsigned int seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		seq = read_seqbegin(&local_port_range_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		if (min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			*min = local_port_range[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		if (max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			*max = local_port_range[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	} while (read_seqretry(&local_port_range_lock, seq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int proc_local_port_range(struct ctl_table *table, int write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 				 void *buffer, size_t *lenp, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	int range[2] = {local_port_range[0], local_port_range[1]};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	struct ctl_table tmp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		.data = &range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		.maxlen = sizeof(range),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		.mode = table->mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		.extra1 = &local_port_range_min,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		.extra2 = &local_port_range_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	if (write && ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		if (range[1] < range[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 			ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 			set_local_port_range(range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static struct ctl_table phonet_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		.procname	= "local_port_range",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 		.data		= &local_port_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 		.maxlen		= sizeof(local_port_range),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 		.mode		= 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 		.proc_handler	= proc_local_port_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int __init phonet_sysctl_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 	return phonet_table_hrd == NULL ? -ENOMEM : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) void phonet_sysctl_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 	unregister_net_sysctl_table(phonet_table_hrd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }