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;
29 static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
31 return net_generic(net, mptcp_pernet_id);
34 int mptcp_is_enabled(struct net *net)
36 return mptcp_get_pernet(net)->mptcp_enabled;
39 unsigned int mptcp_get_add_addr_timeout(struct net *net)
41 return mptcp_get_pernet(net)->add_addr_timeout;
44 int mptcp_is_checksum_enabled(struct net *net)
46 return mptcp_get_pernet(net)->checksum_enabled;
49 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
51 pernet->mptcp_enabled = 1;
52 pernet->add_addr_timeout = TCP_RTO_MAX;
53 pernet->checksum_enabled = 0;
57 static struct ctl_table mptcp_sysctl_table[] = {
59 .procname = "enabled",
62 /* users with CAP_NET_ADMIN or root (not and) can change this
63 * value, same as other sysctl or the 'net' tree.
65 .proc_handler = proc_dou8vec_minmax,
66 .extra1 = SYSCTL_ZERO,
70 .procname = "add_addr_timeout",
71 .maxlen = sizeof(unsigned int),
73 .proc_handler = proc_dointvec_jiffies,
76 .procname = "checksum_enabled",
79 .proc_handler = proc_dou8vec_minmax,
80 .extra1 = SYSCTL_ZERO,
86 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
88 struct ctl_table_header *hdr;
89 struct ctl_table *table;
91 table = mptcp_sysctl_table;
92 if (!net_eq(net, &init_net)) {
93 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
98 table[0].data = &pernet->mptcp_enabled;
99 table[1].data = &pernet->add_addr_timeout;
100 table[2].data = &pernet->checksum_enabled;
102 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
106 pernet->ctl_table_hdr = hdr;
111 if (!net_eq(net, &init_net))
117 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
119 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
121 unregister_net_sysctl_table(pernet->ctl_table_hdr);
128 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
133 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
135 #endif /* CONFIG_SYSCTL */
137 static int __net_init mptcp_net_init(struct net *net)
139 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
141 mptcp_pernet_set_defaults(pernet);
143 return mptcp_pernet_new_table(net, pernet);
146 /* Note: the callback will only be called per extra netns */
147 static void __net_exit mptcp_net_exit(struct net *net)
149 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
151 mptcp_pernet_del_table(pernet);
154 static struct pernet_operations mptcp_pernet_ops = {
155 .init = mptcp_net_init,
156 .exit = mptcp_net_exit,
157 .id = &mptcp_pernet_id,
158 .size = sizeof(struct mptcp_pernet),
161 void __init mptcp_init(void)
163 mptcp_join_cookie_init();
166 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
167 panic("Failed to register MPTCP pernet subsystem.\n");
170 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
171 int __init mptcpv6_init(void)
175 err = mptcp_proto_v6_init();