1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (c) 2019, Tessares SA.
7 #include <linux/sysctl.h>
9 #include <net/net_namespace.h>
10 #include <net/netns/generic.h>
14 #define MPTCP_SYSCTL_PATH "net/mptcp"
16 static int mptcp_pernet_id;
18 struct ctl_table_header *ctl_table_hdr;
23 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
25 return net_generic(net, mptcp_pernet_id);
28 int mptcp_is_enabled(struct net *net)
30 return mptcp_get_pernet(net)->mptcp_enabled;
33 static struct ctl_table mptcp_sysctl_table[] = {
35 .procname = "enabled",
36 .maxlen = sizeof(int),
38 /* users with CAP_NET_ADMIN or root (not and) can change this
39 * value, same as other sysctl or the 'net' tree.
41 .proc_handler = proc_dointvec,
46 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
48 pernet->mptcp_enabled = 1;
51 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
53 struct ctl_table_header *hdr;
54 struct ctl_table *table;
56 table = mptcp_sysctl_table;
57 if (!net_eq(net, &init_net)) {
58 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
63 table[0].data = &pernet->mptcp_enabled;
65 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
69 pernet->ctl_table_hdr = hdr;
74 if (!net_eq(net, &init_net))
80 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
82 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
84 unregister_net_sysctl_table(pernet->ctl_table_hdr);
89 static int __net_init mptcp_net_init(struct net *net)
91 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
93 mptcp_pernet_set_defaults(pernet);
95 return mptcp_pernet_new_table(net, pernet);
98 /* Note: the callback will only be called per extra netns */
99 static void __net_exit mptcp_net_exit(struct net *net)
101 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
103 mptcp_pernet_del_table(pernet);
106 static struct pernet_operations mptcp_pernet_ops = {
107 .init = mptcp_net_init,
108 .exit = mptcp_net_exit,
109 .id = &mptcp_pernet_id,
110 .size = sizeof(struct mptcp_pernet),
113 void __init mptcp_init(void)
117 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
118 panic("Failed to register MPTCP pernet subsystem.\n");
121 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
122 int __init mptcpv6_init(void)
126 err = mptcp_proto_v6_init();