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 static int mptcp_pm_type_max = __MPTCP_PM_TYPE_MAX;
26 struct ctl_table_header *ctl_table_hdr;
29 unsigned int add_addr_timeout;
30 unsigned int close_timeout;
31 unsigned int stale_loss_cnt;
34 u8 allow_join_initial_addr_port;
36 char scheduler[MPTCP_SCHED_NAME_MAX];
39 static struct mptcp_pernet *mptcp_get_pernet(const struct net *net)
41 return net_generic(net, mptcp_pernet_id);
44 int mptcp_is_enabled(const struct net *net)
46 return mptcp_get_pernet(net)->mptcp_enabled;
49 unsigned int mptcp_get_add_addr_timeout(const struct net *net)
51 return mptcp_get_pernet(net)->add_addr_timeout;
54 int mptcp_is_checksum_enabled(const struct net *net)
56 return mptcp_get_pernet(net)->checksum_enabled;
59 int mptcp_allow_join_id0(const struct net *net)
61 return mptcp_get_pernet(net)->allow_join_initial_addr_port;
64 unsigned int mptcp_stale_loss_cnt(const struct net *net)
66 return mptcp_get_pernet(net)->stale_loss_cnt;
69 unsigned int mptcp_close_timeout(const struct sock *sk)
71 if (sock_flag(sk, SOCK_DEAD))
72 return TCP_TIMEWAIT_LEN;
73 return mptcp_get_pernet(sock_net(sk))->close_timeout;
76 int mptcp_get_pm_type(const struct net *net)
78 return mptcp_get_pernet(net)->pm_type;
81 const char *mptcp_get_scheduler(const struct net *net)
83 return mptcp_get_pernet(net)->scheduler;
86 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
88 pernet->mptcp_enabled = 1;
89 pernet->add_addr_timeout = TCP_RTO_MAX;
90 pernet->close_timeout = TCP_TIMEWAIT_LEN;
91 pernet->checksum_enabled = 0;
92 pernet->allow_join_initial_addr_port = 1;
93 pernet->stale_loss_cnt = 4;
94 pernet->pm_type = MPTCP_PM_TYPE_KERNEL;
95 strcpy(pernet->scheduler, "default");
99 static struct ctl_table mptcp_sysctl_table[] = {
101 .procname = "enabled",
102 .maxlen = sizeof(u8),
104 /* users with CAP_NET_ADMIN or root (not and) can change this
105 * value, same as other sysctl or the 'net' tree.
107 .proc_handler = proc_dou8vec_minmax,
108 .extra1 = SYSCTL_ZERO,
112 .procname = "add_addr_timeout",
113 .maxlen = sizeof(unsigned int),
115 .proc_handler = proc_dointvec_jiffies,
118 .procname = "checksum_enabled",
119 .maxlen = sizeof(u8),
121 .proc_handler = proc_dou8vec_minmax,
122 .extra1 = SYSCTL_ZERO,
126 .procname = "allow_join_initial_addr_port",
127 .maxlen = sizeof(u8),
129 .proc_handler = proc_dou8vec_minmax,
130 .extra1 = SYSCTL_ZERO,
134 .procname = "stale_loss_cnt",
135 .maxlen = sizeof(unsigned int),
137 .proc_handler = proc_douintvec_minmax,
140 .procname = "pm_type",
141 .maxlen = sizeof(u8),
143 .proc_handler = proc_dou8vec_minmax,
144 .extra1 = SYSCTL_ZERO,
145 .extra2 = &mptcp_pm_type_max
148 .procname = "scheduler",
149 .maxlen = MPTCP_SCHED_NAME_MAX,
151 .proc_handler = proc_dostring,
154 .procname = "close_timeout",
155 .maxlen = sizeof(unsigned int),
157 .proc_handler = proc_dointvec_jiffies,
162 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
164 struct ctl_table_header *hdr;
165 struct ctl_table *table;
167 table = mptcp_sysctl_table;
168 if (!net_eq(net, &init_net)) {
169 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
174 table[0].data = &pernet->mptcp_enabled;
175 table[1].data = &pernet->add_addr_timeout;
176 table[2].data = &pernet->checksum_enabled;
177 table[3].data = &pernet->allow_join_initial_addr_port;
178 table[4].data = &pernet->stale_loss_cnt;
179 table[5].data = &pernet->pm_type;
180 table[6].data = &pernet->scheduler;
181 table[7].data = &pernet->close_timeout;
183 hdr = register_net_sysctl_sz(net, MPTCP_SYSCTL_PATH, table,
184 ARRAY_SIZE(mptcp_sysctl_table));
188 pernet->ctl_table_hdr = hdr;
193 if (!net_eq(net, &init_net))
199 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
201 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
203 unregister_net_sysctl_table(pernet->ctl_table_hdr);
210 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
215 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
217 #endif /* CONFIG_SYSCTL */
219 static int __net_init mptcp_net_init(struct net *net)
221 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
223 mptcp_pernet_set_defaults(pernet);
225 return mptcp_pernet_new_table(net, pernet);
228 /* Note: the callback will only be called per extra netns */
229 static void __net_exit mptcp_net_exit(struct net *net)
231 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
233 mptcp_pernet_del_table(pernet);
236 static struct pernet_operations mptcp_pernet_ops = {
237 .init = mptcp_net_init,
238 .exit = mptcp_net_exit,
239 .id = &mptcp_pernet_id,
240 .size = sizeof(struct mptcp_pernet),
243 void __init mptcp_init(void)
245 mptcp_join_cookie_init();
248 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
249 panic("Failed to register MPTCP pernet subsystem.\n");
252 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
253 int __init mptcpv6_init(void)
257 err = mptcp_proto_v6_init();