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1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2019, Tessares SA.
5 */
6
7#ifdef CONFIG_SYSCTL
8#include <linux/sysctl.h>
9#endif
10
11#include <net/net_namespace.h>
12#include <net/netns/generic.h>
13
14#include "protocol.h"
15
16#define MPTCP_SYSCTL_PATH "net/mptcp"
17
18static int mptcp_pernet_id;
19
20#ifdef CONFIG_SYSCTL
21static int mptcp_pm_type_max = __MPTCP_PM_TYPE_MAX;
22#endif
23
24struct mptcp_pernet {
25#ifdef CONFIG_SYSCTL
26 struct ctl_table_header *ctl_table_hdr;
27#endif
28
29 unsigned int add_addr_timeout;
30 unsigned int stale_loss_cnt;
31 u8 mptcp_enabled;
32 u8 checksum_enabled;
33 u8 allow_join_initial_addr_port;
34 u8 pm_type;
35};
36
37static struct mptcp_pernet *mptcp_get_pernet(const struct net *net)
38{
39 return net_generic(net, mptcp_pernet_id);
40}
41
42int mptcp_is_enabled(const struct net *net)
43{
44 return mptcp_get_pernet(net)->mptcp_enabled;
45}
46
47unsigned int mptcp_get_add_addr_timeout(const struct net *net)
48{
49 return mptcp_get_pernet(net)->add_addr_timeout;
50}
51
52int mptcp_is_checksum_enabled(const struct net *net)
53{
54 return mptcp_get_pernet(net)->checksum_enabled;
55}
56
57int mptcp_allow_join_id0(const struct net *net)
58{
59 return mptcp_get_pernet(net)->allow_join_initial_addr_port;
60}
61
62unsigned int mptcp_stale_loss_cnt(const struct net *net)
63{
64 return mptcp_get_pernet(net)->stale_loss_cnt;
65}
66
67int mptcp_get_pm_type(const struct net *net)
68{
69 return mptcp_get_pernet(net)->pm_type;
70}
71
72static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
73{
74 pernet->mptcp_enabled = 1;
75 pernet->add_addr_timeout = TCP_RTO_MAX;
76 pernet->checksum_enabled = 0;
77 pernet->allow_join_initial_addr_port = 1;
78 pernet->stale_loss_cnt = 4;
79 pernet->pm_type = MPTCP_PM_TYPE_KERNEL;
80}
81
82#ifdef CONFIG_SYSCTL
83static struct ctl_table mptcp_sysctl_table[] = {
84 {
85 .procname = "enabled",
86 .maxlen = sizeof(u8),
87 .mode = 0644,
88 /* users with CAP_NET_ADMIN or root (not and) can change this
89 * value, same as other sysctl or the 'net' tree.
90 */
91 .proc_handler = proc_dou8vec_minmax,
92 .extra1 = SYSCTL_ZERO,
93 .extra2 = SYSCTL_ONE
94 },
95 {
96 .procname = "add_addr_timeout",
97 .maxlen = sizeof(unsigned int),
98 .mode = 0644,
99 .proc_handler = proc_dointvec_jiffies,
100 },
101 {
102 .procname = "checksum_enabled",
103 .maxlen = sizeof(u8),
104 .mode = 0644,
105 .proc_handler = proc_dou8vec_minmax,
106 .extra1 = SYSCTL_ZERO,
107 .extra2 = SYSCTL_ONE
108 },
109 {
110 .procname = "allow_join_initial_addr_port",
111 .maxlen = sizeof(u8),
112 .mode = 0644,
113 .proc_handler = proc_dou8vec_minmax,
114 .extra1 = SYSCTL_ZERO,
115 .extra2 = SYSCTL_ONE
116 },
117 {
118 .procname = "stale_loss_cnt",
119 .maxlen = sizeof(unsigned int),
120 .mode = 0644,
121 .proc_handler = proc_douintvec_minmax,
122 },
123 {
124 .procname = "pm_type",
125 .maxlen = sizeof(u8),
126 .mode = 0644,
127 .proc_handler = proc_dou8vec_minmax,
128 .extra1 = SYSCTL_ZERO,
129 .extra2 = &mptcp_pm_type_max
130 },
131 {}
132};
133
134static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
135{
136 struct ctl_table_header *hdr;
137 struct ctl_table *table;
138
139 table = mptcp_sysctl_table;
140 if (!net_eq(net, &init_net)) {
141 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
142 if (!table)
143 goto err_alloc;
144 }
145
146 table[0].data = &pernet->mptcp_enabled;
147 table[1].data = &pernet->add_addr_timeout;
148 table[2].data = &pernet->checksum_enabled;
149 table[3].data = &pernet->allow_join_initial_addr_port;
150 table[4].data = &pernet->stale_loss_cnt;
151 table[5].data = &pernet->pm_type;
152
153 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
154 if (!hdr)
155 goto err_reg;
156
157 pernet->ctl_table_hdr = hdr;
158
159 return 0;
160
161err_reg:
162 if (!net_eq(net, &init_net))
163 kfree(table);
164err_alloc:
165 return -ENOMEM;
166}
167
168static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
169{
170 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
171
172 unregister_net_sysctl_table(pernet->ctl_table_hdr);
173
174 kfree(table);
175}
176
177#else
178
179static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
180{
181 return 0;
182}
183
184static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
185
186#endif /* CONFIG_SYSCTL */
187
188static int __net_init mptcp_net_init(struct net *net)
189{
190 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
191
192 mptcp_pernet_set_defaults(pernet);
193
194 return mptcp_pernet_new_table(net, pernet);
195}
196
197/* Note: the callback will only be called per extra netns */
198static void __net_exit mptcp_net_exit(struct net *net)
199{
200 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
201
202 mptcp_pernet_del_table(pernet);
203}
204
205static struct pernet_operations mptcp_pernet_ops = {
206 .init = mptcp_net_init,
207 .exit = mptcp_net_exit,
208 .id = &mptcp_pernet_id,
209 .size = sizeof(struct mptcp_pernet),
210};
211
212void __init mptcp_init(void)
213{
214 mptcp_join_cookie_init();
215 mptcp_proto_init();
216
217 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
218 panic("Failed to register MPTCP pernet subsystem.\n");
219}
220
221#if IS_ENABLED(CONFIG_MPTCP_IPV6)
222int __init mptcpv6_init(void)
223{
224 int err;
225
226 err = mptcp_proto_v6_init();
227
228 return err;
229}
230#endif
1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2019, Tessares SA.
5 */
6
7#include <linux/sysctl.h>
8
9#include <net/net_namespace.h>
10#include <net/netns/generic.h>
11
12#include "protocol.h"
13
14#define MPTCP_SYSCTL_PATH "net/mptcp"
15
16static int mptcp_pernet_id;
17struct mptcp_pernet {
18 struct ctl_table_header *ctl_table_hdr;
19
20 int mptcp_enabled;
21};
22
23static struct mptcp_pernet *mptcp_get_pernet(struct net *net)
24{
25 return net_generic(net, mptcp_pernet_id);
26}
27
28int mptcp_is_enabled(struct net *net)
29{
30 return mptcp_get_pernet(net)->mptcp_enabled;
31}
32
33static struct ctl_table mptcp_sysctl_table[] = {
34 {
35 .procname = "enabled",
36 .maxlen = sizeof(int),
37 .mode = 0644,
38 /* users with CAP_NET_ADMIN or root (not and) can change this
39 * value, same as other sysctl or the 'net' tree.
40 */
41 .proc_handler = proc_dointvec,
42 },
43 {}
44};
45
46static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
47{
48 pernet->mptcp_enabled = 1;
49}
50
51static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
52{
53 struct ctl_table_header *hdr;
54 struct ctl_table *table;
55
56 table = mptcp_sysctl_table;
57 if (!net_eq(net, &init_net)) {
58 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
59 if (!table)
60 goto err_alloc;
61 }
62
63 table[0].data = &pernet->mptcp_enabled;
64
65 hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
66 if (!hdr)
67 goto err_reg;
68
69 pernet->ctl_table_hdr = hdr;
70
71 return 0;
72
73err_reg:
74 if (!net_eq(net, &init_net))
75 kfree(table);
76err_alloc:
77 return -ENOMEM;
78}
79
80static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
81{
82 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
83
84 unregister_net_sysctl_table(pernet->ctl_table_hdr);
85
86 kfree(table);
87}
88
89static int __net_init mptcp_net_init(struct net *net)
90{
91 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
92
93 mptcp_pernet_set_defaults(pernet);
94
95 return mptcp_pernet_new_table(net, pernet);
96}
97
98/* Note: the callback will only be called per extra netns */
99static void __net_exit mptcp_net_exit(struct net *net)
100{
101 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
102
103 mptcp_pernet_del_table(pernet);
104}
105
106static 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),
111};
112
113void __init mptcp_init(void)
114{
115 mptcp_join_cookie_init();
116 mptcp_proto_init();
117
118 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
119 panic("Failed to register MPTCP pernet subsystem.\n");
120}
121
122#if IS_ENABLED(CONFIG_MPTCP_IPV6)
123int __init mptcpv6_init(void)
124{
125 int err;
126
127 err = mptcp_proto_v6_init();
128
129 return err;
130}
131#endif