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784325e9 MB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2019, Tessares SA. | |
5 | */ | |
6 | ||
804c72ee | 7 | #ifdef CONFIG_SYSCTL |
784325e9 | 8 | #include <linux/sysctl.h> |
804c72ee | 9 | #endif |
784325e9 MB |
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 | ||
18 | static int mptcp_pernet_id; | |
19 | struct mptcp_pernet { | |
804c72ee | 20 | #ifdef CONFIG_SYSCTL |
784325e9 | 21 | struct ctl_table_header *ctl_table_hdr; |
804c72ee | 22 | #endif |
784325e9 | 23 | |
93f323b9 | 24 | unsigned int add_addr_timeout; |
6da14d74 | 25 | u8 mptcp_enabled; |
fc3c82ee | 26 | u8 checksum_enabled; |
d2f77960 | 27 | u8 allow_join_initial_addr_port; |
784325e9 MB |
28 | }; |
29 | ||
6da14d74 | 30 | static struct mptcp_pernet *mptcp_get_pernet(const struct net *net) |
784325e9 MB |
31 | { |
32 | return net_generic(net, mptcp_pernet_id); | |
33 | } | |
34 | ||
6da14d74 | 35 | int mptcp_is_enabled(const struct net *net) |
784325e9 MB |
36 | { |
37 | return mptcp_get_pernet(net)->mptcp_enabled; | |
38 | } | |
39 | ||
6da14d74 | 40 | unsigned int mptcp_get_add_addr_timeout(const struct net *net) |
93f323b9 GT |
41 | { |
42 | return mptcp_get_pernet(net)->add_addr_timeout; | |
43 | } | |
44 | ||
6da14d74 | 45 | int mptcp_is_checksum_enabled(const struct net *net) |
fc3c82ee GT |
46 | { |
47 | return mptcp_get_pernet(net)->checksum_enabled; | |
48 | } | |
49 | ||
6da14d74 | 50 | int mptcp_allow_join_id0(const struct net *net) |
d2f77960 GT |
51 | { |
52 | return mptcp_get_pernet(net)->allow_join_initial_addr_port; | |
53 | } | |
54 | ||
804c72ee MB |
55 | static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) |
56 | { | |
57 | pernet->mptcp_enabled = 1; | |
58 | pernet->add_addr_timeout = TCP_RTO_MAX; | |
fc3c82ee | 59 | pernet->checksum_enabled = 0; |
d2f77960 | 60 | pernet->allow_join_initial_addr_port = 1; |
804c72ee MB |
61 | } |
62 | ||
63 | #ifdef CONFIG_SYSCTL | |
784325e9 MB |
64 | static struct ctl_table mptcp_sysctl_table[] = { |
65 | { | |
66 | .procname = "enabled", | |
744ee140 | 67 | .maxlen = sizeof(u8), |
784325e9 MB |
68 | .mode = 0644, |
69 | /* users with CAP_NET_ADMIN or root (not and) can change this | |
70 | * value, same as other sysctl or the 'net' tree. | |
71 | */ | |
744ee140 MB |
72 | .proc_handler = proc_dou8vec_minmax, |
73 | .extra1 = SYSCTL_ZERO, | |
74 | .extra2 = SYSCTL_ONE | |
784325e9 | 75 | }, |
93f323b9 GT |
76 | { |
77 | .procname = "add_addr_timeout", | |
78 | .maxlen = sizeof(unsigned int), | |
79 | .mode = 0644, | |
80 | .proc_handler = proc_dointvec_jiffies, | |
81 | }, | |
fc3c82ee GT |
82 | { |
83 | .procname = "checksum_enabled", | |
84 | .maxlen = sizeof(u8), | |
85 | .mode = 0644, | |
86 | .proc_handler = proc_dou8vec_minmax, | |
87 | .extra1 = SYSCTL_ZERO, | |
88 | .extra2 = SYSCTL_ONE | |
89 | }, | |
d2f77960 GT |
90 | { |
91 | .procname = "allow_join_initial_addr_port", | |
92 | .maxlen = sizeof(u8), | |
93 | .mode = 0644, | |
94 | .proc_handler = proc_dou8vec_minmax, | |
95 | .extra1 = SYSCTL_ZERO, | |
96 | .extra2 = SYSCTL_ONE | |
97 | }, | |
784325e9 MB |
98 | {} |
99 | }; | |
100 | ||
784325e9 MB |
101 | static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) |
102 | { | |
103 | struct ctl_table_header *hdr; | |
104 | struct ctl_table *table; | |
105 | ||
106 | table = mptcp_sysctl_table; | |
107 | if (!net_eq(net, &init_net)) { | |
108 | table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL); | |
109 | if (!table) | |
110 | goto err_alloc; | |
111 | } | |
112 | ||
113 | table[0].data = &pernet->mptcp_enabled; | |
93f323b9 | 114 | table[1].data = &pernet->add_addr_timeout; |
fc3c82ee | 115 | table[2].data = &pernet->checksum_enabled; |
d2f77960 | 116 | table[3].data = &pernet->allow_join_initial_addr_port; |
784325e9 MB |
117 | |
118 | hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table); | |
119 | if (!hdr) | |
120 | goto err_reg; | |
121 | ||
122 | pernet->ctl_table_hdr = hdr; | |
123 | ||
124 | return 0; | |
125 | ||
126 | err_reg: | |
127 | if (!net_eq(net, &init_net)) | |
128 | kfree(table); | |
129 | err_alloc: | |
130 | return -ENOMEM; | |
131 | } | |
132 | ||
133 | static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) | |
134 | { | |
135 | struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg; | |
136 | ||
137 | unregister_net_sysctl_table(pernet->ctl_table_hdr); | |
138 | ||
139 | kfree(table); | |
140 | } | |
141 | ||
804c72ee MB |
142 | #else |
143 | ||
144 | static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) | |
145 | { | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {} | |
150 | ||
151 | #endif /* CONFIG_SYSCTL */ | |
152 | ||
784325e9 MB |
153 | static int __net_init mptcp_net_init(struct net *net) |
154 | { | |
155 | struct mptcp_pernet *pernet = mptcp_get_pernet(net); | |
156 | ||
157 | mptcp_pernet_set_defaults(pernet); | |
158 | ||
159 | return mptcp_pernet_new_table(net, pernet); | |
160 | } | |
161 | ||
162 | /* Note: the callback will only be called per extra netns */ | |
163 | static void __net_exit mptcp_net_exit(struct net *net) | |
164 | { | |
165 | struct mptcp_pernet *pernet = mptcp_get_pernet(net); | |
166 | ||
167 | mptcp_pernet_del_table(pernet); | |
168 | } | |
169 | ||
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), | |
175 | }; | |
176 | ||
177 | void __init mptcp_init(void) | |
178 | { | |
9466a1cc | 179 | mptcp_join_cookie_init(); |
784325e9 MB |
180 | mptcp_proto_init(); |
181 | ||
182 | if (register_pernet_subsys(&mptcp_pernet_ops) < 0) | |
183 | panic("Failed to register MPTCP pernet subsystem.\n"); | |
184 | } | |
185 | ||
186 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
187 | int __init mptcpv6_init(void) | |
188 | { | |
189 | int err; | |
190 | ||
191 | err = mptcp_proto_v6_init(); | |
192 | ||
193 | return err; | |
194 | } | |
195 | #endif |