ctrl.c
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// SPDX-License-Identifier: GPL-2.0
/* Multipath TCP
*
* Copyright (c) 2019, Tessares SA.
*/
#include <linux/sysctl.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "protocol.h"
#define MPTCP_SYSCTL_PATH "net/mptcp"
static int mptcp_pernet_id;
struct mptcp_pernet {
struct ctl_table_header *ctl_table_hdr;
int mptcp_enabled;
};
static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
{
return net_generic(net, mptcp_pernet_id);
}
int mptcp_is_enabled(struct net *net)
{
return mptcp_get_pernet(net)->mptcp_enabled;
}
static struct ctl_table mptcp_sysctl_table[] = {
{
.procname = "enabled",
.maxlen = sizeof(int),
.mode = 0644,
/* users with CAP_NET_ADMIN or root (not and) can change this
* value, same as other sysctl or the 'net' tree.
*/
.proc_handler = proc_dointvec,
},
{}
};
static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
{
pernet->mptcp_enabled = 1;
}
static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
{
struct ctl_table_header *hdr;
struct ctl_table *table;
table = mptcp_sysctl_table;
if (!net_eq(net, &init_net)) {
table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
if (!table)
goto err_alloc;
}
table[0].data = &pernet->mptcp_enabled;
hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
if (!hdr)
goto err_reg;
pernet->ctl_table_hdr = hdr;
return 0;
err_reg:
if (!net_eq(net, &init_net))
kfree(table);
err_alloc:
return -ENOMEM;
}
static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
{
struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
unregister_net_sysctl_table(pernet->ctl_table_hdr);
kfree(table);
}
static int __net_init mptcp_net_init(struct net *net)
{
struct mptcp_pernet *pernet = mptcp_get_pernet(net);
mptcp_pernet_set_defaults(pernet);
return mptcp_pernet_new_table(net, pernet);
}
/* Note: the callback will only be called per extra netns */
static void __net_exit mptcp_net_exit(struct net *net)
{
struct mptcp_pernet *pernet = mptcp_get_pernet(net);
mptcp_pernet_del_table(pernet);
}
static struct pernet_operations mptcp_pernet_ops = {
.init = mptcp_net_init,
.exit = mptcp_net_exit,
.id = &mptcp_pernet_id,
.size = sizeof(struct mptcp_pernet),
};
void __init mptcp_init(void)
{
mptcp_join_cookie_init();
mptcp_proto_init();
if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
panic("Failed to register MPTCP pernet subsystem.\n");
}
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
int __init mptcpv6_init(void)
{
int err;
err = mptcp_proto_v6_init();
return err;
}
#endif