1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (c) 2019, Tessares SA.
8 #include <linux/sysctl.h>
11 #include <net/net_namespace.h>
12 #include <net/netns/generic.h>
16 #define MPTCP_SYSCTL_PATH "net/mptcp"
18 static int mptcp_pernet_id;
21 struct ctl_table_header *ctl_table_hdr;
25 unsigned int add_addr_timeout;
27 u8 allow_join_initial_addr_port;
30 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
32 return net_generic(net, mptcp_pernet_id);
35 int mptcp_is_enabled(struct net *net)
37 return mptcp_get_pernet(net)->mptcp_enabled;
40 unsigned int mptcp_get_add_addr_timeout(struct net *net)
42 return mptcp_get_pernet(net)->add_addr_timeout;
45 int mptcp_is_checksum_enabled(struct net *net)
47 return mptcp_get_pernet(net)->checksum_enabled;
50 int mptcp_allow_join_id0(struct net *net)
52 return mptcp_get_pernet(net)->allow_join_initial_addr_port;
55 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
57 pernet->mptcp_enabled = 1;
58 pernet->add_addr_timeout = TCP_RTO_MAX;
59 pernet->checksum_enabled = 0;
60 pernet->allow_join_initial_addr_port = 1;
64 static struct ctl_table mptcp_sysctl_table[] = {
66 .procname = "enabled",
69 /* users with CAP_NET_ADMIN or root (not and) can change this
70 * value, same as other sysctl or the 'net' tree.
72 .proc_handler = proc_dou8vec_minmax,
73 .extra1 = SYSCTL_ZERO,
77 .procname = "add_addr_timeout",
78 .maxlen = sizeof(unsigned int),
80 .proc_handler = proc_dointvec_jiffies,
83 .procname = "checksum_enabled",
86 .proc_handler = proc_dou8vec_minmax,
87 .extra1 = SYSCTL_ZERO,
91 .procname = "allow_join_initial_addr_port",
94 .proc_handler = proc_dou8vec_minmax,
95 .extra1 = SYSCTL_ZERO,
101 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
103 struct ctl_table_header *hdr;
104 struct ctl_table *table;
106 table = mptcp_sysctl_table;
107 if (!net_eq(net, &init_net)) {
108 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
113 table[0].data = &pernet->mptcp_enabled;
114 table[1].data = &pernet->add_addr_timeout;
115 table[2].data = &pernet->checksum_enabled;
116 table[3].data = &pernet->allow_join_initial_addr_port;
118 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
122 pernet->ctl_table_hdr = hdr;
127 if (!net_eq(net, &init_net))
133 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
135 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
137 unregister_net_sysctl_table(pernet->ctl_table_hdr);
144 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
149 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
151 #endif /* CONFIG_SYSCTL */
153 static int __net_init mptcp_net_init(struct net *net)
155 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
157 mptcp_pernet_set_defaults(pernet);
159 return mptcp_pernet_new_table(net, pernet);
162 /* Note: the callback will only be called per extra netns */
163 static void __net_exit mptcp_net_exit(struct net *net)
165 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
167 mptcp_pernet_del_table(pernet);
170 static struct pernet_operations mptcp_pernet_ops = {
171 .init = mptcp_net_init,
172 .exit = mptcp_net_exit,
173 .id = &mptcp_pernet_id,
174 .size = sizeof(struct mptcp_pernet),
177 void __init mptcp_init(void)
179 mptcp_join_cookie_init();
182 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
183 panic("Failed to register MPTCP pernet subsystem.\n");
186 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
187 int __init mptcpv6_init(void)
191 err = mptcp_proto_v6_init();