73dbd8cf79
This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which
will reduce the overall build time size of the kernel and run time
memory bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)
To avoid lots of small commits, this commit brings together network
changes from (as they appear in MAINTAINERS) LLC, MPTCP, NETROM NETWORK
LAYER, PHONET PROTOCOL, ROSE NETWORK LAYER, RXRPC SOCKETS, SCTP
PROTOCOL, SHARED MEMORY COMMUNICATIONS (SMC), TIPC NETWORK LAYER and
NETWORKING [IPSEC]
* Remove sentinel element from ctl_table structs.
* Replace empty array registration with the register_net_sysctl_sz call
in llc_sysctl_init
* Replace the for loop stop condition that tests for procname == NULL
with one that depends on array size in sctp_sysctl_net_register
* Remove instances where an array element is zeroed out to make it look
like a sentinel in xfrm_sysctl_init. This is not longer needed and is
safe after commit c899710fe7 ("networking: Update to
register_net_sysctl_sz") added the array size to the ctl_table
registration
* Use a table_size variable to keep the value of ARRAY_SIZE
Signed-off-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File: sysctl.c
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*
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* Phonet /proc/sys/net/phonet interface implementation
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Author: Rémi Denis-Courmont
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*/
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#include <linux/seqlock.h>
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#include <linux/sysctl.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <net/sock.h>
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#include <linux/phonet.h>
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#include <net/phonet/phonet.h>
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#define DYNAMIC_PORT_MIN 0x40
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#define DYNAMIC_PORT_MAX 0x7f
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static DEFINE_SEQLOCK(local_port_range_lock);
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static int local_port_range_min[2] = {0, 0};
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static int local_port_range_max[2] = {1023, 1023};
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static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
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static struct ctl_table_header *phonet_table_hrd;
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static void set_local_port_range(int range[2])
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{
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write_seqlock(&local_port_range_lock);
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local_port_range[0] = range[0];
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local_port_range[1] = range[1];
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write_sequnlock(&local_port_range_lock);
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}
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void phonet_get_local_port_range(int *min, int *max)
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{
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unsigned int seq;
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do {
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seq = read_seqbegin(&local_port_range_lock);
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if (min)
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*min = local_port_range[0];
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if (max)
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*max = local_port_range[1];
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} while (read_seqretry(&local_port_range_lock, seq));
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}
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static int proc_local_port_range(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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int ret;
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int range[2] = {local_port_range[0], local_port_range[1]};
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struct ctl_table tmp = {
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.data = &range,
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.maxlen = sizeof(range),
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.mode = table->mode,
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.extra1 = &local_port_range_min,
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.extra2 = &local_port_range_max,
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};
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && ret == 0) {
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if (range[1] < range[0])
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ret = -EINVAL;
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else
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set_local_port_range(range);
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}
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return ret;
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}
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static struct ctl_table phonet_table[] = {
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{
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.procname = "local_port_range",
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.data = &local_port_range,
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.maxlen = sizeof(local_port_range),
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.mode = 0644,
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.proc_handler = proc_local_port_range,
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},
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};
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int __init phonet_sysctl_init(void)
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{
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phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
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return phonet_table_hrd == NULL ? -ENOMEM : 0;
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}
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void phonet_sysctl_exit(void)
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{
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unregister_net_sysctl_table(phonet_table_hrd);
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}
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