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;
21 unsigned int add_addr_timeout;
24 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
26 return net_generic(net, mptcp_pernet_id);
29 int mptcp_is_enabled(struct net *net)
31 return mptcp_get_pernet(net)->mptcp_enabled;
34 unsigned int mptcp_get_add_addr_timeout(struct net *net)
36 return mptcp_get_pernet(net)->add_addr_timeout;
39 static struct ctl_table mptcp_sysctl_table[] = {
41 .procname = "enabled",
42 .maxlen = sizeof(int),
44 /* users with CAP_NET_ADMIN or root (not and) can change this
45 * value, same as other sysctl or the 'net' tree.
47 .proc_handler = proc_dointvec,
50 .procname = "add_addr_timeout",
51 .maxlen = sizeof(unsigned int),
53 .proc_handler = proc_dointvec_jiffies,
58 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
60 pernet->mptcp_enabled = 1;
61 pernet->add_addr_timeout = TCP_RTO_MAX;
64 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
66 struct ctl_table_header *hdr;
67 struct ctl_table *table;
69 table = mptcp_sysctl_table;
70 if (!net_eq(net, &init_net)) {
71 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
76 table[0].data = &pernet->mptcp_enabled;
77 table[1].data = &pernet->add_addr_timeout;
79 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
83 pernet->ctl_table_hdr = hdr;
88 if (!net_eq(net, &init_net))
94 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
96 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
98 unregister_net_sysctl_table(pernet->ctl_table_hdr);
103 static int __net_init mptcp_net_init(struct net *net)
105 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
107 mptcp_pernet_set_defaults(pernet);
109 return mptcp_pernet_new_table(net, pernet);
112 /* Note: the callback will only be called per extra netns */
113 static void __net_exit mptcp_net_exit(struct net *net)
115 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
117 mptcp_pernet_del_table(pernet);
120 static struct pernet_operations mptcp_pernet_ops = {
121 .init = mptcp_net_init,
122 .exit = mptcp_net_exit,
123 .id = &mptcp_pernet_id,
124 .size = sizeof(struct mptcp_pernet),
127 void __init mptcp_init(void)
129 mptcp_join_cookie_init();
132 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
133 panic("Failed to register MPTCP pernet subsystem.\n");
136 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
137 int __init mptcpv6_init(void)
141 err = mptcp_proto_v6_init();