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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; |
ff5a0b42 | 25 | unsigned int stale_loss_cnt; |
6da14d74 | 26 | u8 mptcp_enabled; |
fc3c82ee | 27 | u8 checksum_enabled; |
d2f77960 | 28 | u8 allow_join_initial_addr_port; |
784325e9 MB |
29 | }; |
30 | ||
6da14d74 | 31 | static struct mptcp_pernet *mptcp_get_pernet(const struct net *net) |
784325e9 MB |
32 | { |
33 | return net_generic(net, mptcp_pernet_id); | |
34 | } | |
35 | ||
6da14d74 | 36 | int mptcp_is_enabled(const struct net *net) |
784325e9 MB |
37 | { |
38 | return mptcp_get_pernet(net)->mptcp_enabled; | |
39 | } | |
40 | ||
6da14d74 | 41 | unsigned int mptcp_get_add_addr_timeout(const struct net *net) |
93f323b9 GT |
42 | { |
43 | return mptcp_get_pernet(net)->add_addr_timeout; | |
44 | } | |
45 | ||
6da14d74 | 46 | int mptcp_is_checksum_enabled(const struct net *net) |
fc3c82ee GT |
47 | { |
48 | return mptcp_get_pernet(net)->checksum_enabled; | |
49 | } | |
50 | ||
6da14d74 | 51 | int mptcp_allow_join_id0(const struct net *net) |
d2f77960 GT |
52 | { |
53 | return mptcp_get_pernet(net)->allow_join_initial_addr_port; | |
54 | } | |
55 | ||
ff5a0b42 PA |
56 | unsigned int mptcp_stale_loss_cnt(const struct net *net) |
57 | { | |
58 | return mptcp_get_pernet(net)->stale_loss_cnt; | |
59 | } | |
60 | ||
804c72ee MB |
61 | static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) |
62 | { | |
63 | pernet->mptcp_enabled = 1; | |
64 | pernet->add_addr_timeout = TCP_RTO_MAX; | |
fc3c82ee | 65 | pernet->checksum_enabled = 0; |
d2f77960 | 66 | pernet->allow_join_initial_addr_port = 1; |
ff5a0b42 | 67 | pernet->stale_loss_cnt = 4; |
804c72ee MB |
68 | } |
69 | ||
70 | #ifdef CONFIG_SYSCTL | |
784325e9 MB |
71 | static struct ctl_table mptcp_sysctl_table[] = { |
72 | { | |
73 | .procname = "enabled", | |
744ee140 | 74 | .maxlen = sizeof(u8), |
784325e9 MB |
75 | .mode = 0644, |
76 | /* users with CAP_NET_ADMIN or root (not and) can change this | |
77 | * value, same as other sysctl or the 'net' tree. | |
78 | */ | |
744ee140 MB |
79 | .proc_handler = proc_dou8vec_minmax, |
80 | .extra1 = SYSCTL_ZERO, | |
81 | .extra2 = SYSCTL_ONE | |
784325e9 | 82 | }, |
93f323b9 GT |
83 | { |
84 | .procname = "add_addr_timeout", | |
85 | .maxlen = sizeof(unsigned int), | |
86 | .mode = 0644, | |
87 | .proc_handler = proc_dointvec_jiffies, | |
88 | }, | |
fc3c82ee GT |
89 | { |
90 | .procname = "checksum_enabled", | |
91 | .maxlen = sizeof(u8), | |
92 | .mode = 0644, | |
93 | .proc_handler = proc_dou8vec_minmax, | |
94 | .extra1 = SYSCTL_ZERO, | |
95 | .extra2 = SYSCTL_ONE | |
96 | }, | |
d2f77960 GT |
97 | { |
98 | .procname = "allow_join_initial_addr_port", | |
99 | .maxlen = sizeof(u8), | |
100 | .mode = 0644, | |
101 | .proc_handler = proc_dou8vec_minmax, | |
102 | .extra1 = SYSCTL_ZERO, | |
103 | .extra2 = SYSCTL_ONE | |
104 | }, | |
ff5a0b42 PA |
105 | { |
106 | .procname = "stale_loss_cnt", | |
107 | .maxlen = sizeof(unsigned int), | |
108 | .mode = 0644, | |
109 | .proc_handler = proc_douintvec_minmax, | |
110 | }, | |
784325e9 MB |
111 | {} |
112 | }; | |
113 | ||
784325e9 MB |
114 | static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) |
115 | { | |
116 | struct ctl_table_header *hdr; | |
117 | struct ctl_table *table; | |
118 | ||
119 | table = mptcp_sysctl_table; | |
120 | if (!net_eq(net, &init_net)) { | |
121 | table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL); | |
122 | if (!table) | |
123 | goto err_alloc; | |
124 | } | |
125 | ||
126 | table[0].data = &pernet->mptcp_enabled; | |
93f323b9 | 127 | table[1].data = &pernet->add_addr_timeout; |
fc3c82ee | 128 | table[2].data = &pernet->checksum_enabled; |
d2f77960 | 129 | table[3].data = &pernet->allow_join_initial_addr_port; |
ff5a0b42 | 130 | table[4].data = &pernet->stale_loss_cnt; |
784325e9 MB |
131 | |
132 | hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table); | |
133 | if (!hdr) | |
134 | goto err_reg; | |
135 | ||
136 | pernet->ctl_table_hdr = hdr; | |
137 | ||
138 | return 0; | |
139 | ||
140 | err_reg: | |
141 | if (!net_eq(net, &init_net)) | |
142 | kfree(table); | |
143 | err_alloc: | |
144 | return -ENOMEM; | |
145 | } | |
146 | ||
147 | static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) | |
148 | { | |
149 | struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg; | |
150 | ||
151 | unregister_net_sysctl_table(pernet->ctl_table_hdr); | |
152 | ||
153 | kfree(table); | |
154 | } | |
155 | ||
804c72ee MB |
156 | #else |
157 | ||
158 | static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) | |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {} | |
164 | ||
165 | #endif /* CONFIG_SYSCTL */ | |
166 | ||
784325e9 MB |
167 | static int __net_init mptcp_net_init(struct net *net) |
168 | { | |
169 | struct mptcp_pernet *pernet = mptcp_get_pernet(net); | |
170 | ||
171 | mptcp_pernet_set_defaults(pernet); | |
172 | ||
173 | return mptcp_pernet_new_table(net, pernet); | |
174 | } | |
175 | ||
176 | /* Note: the callback will only be called per extra netns */ | |
177 | static void __net_exit mptcp_net_exit(struct net *net) | |
178 | { | |
179 | struct mptcp_pernet *pernet = mptcp_get_pernet(net); | |
180 | ||
181 | mptcp_pernet_del_table(pernet); | |
182 | } | |
183 | ||
184 | static struct pernet_operations mptcp_pernet_ops = { | |
185 | .init = mptcp_net_init, | |
186 | .exit = mptcp_net_exit, | |
187 | .id = &mptcp_pernet_id, | |
188 | .size = sizeof(struct mptcp_pernet), | |
189 | }; | |
190 | ||
191 | void __init mptcp_init(void) | |
192 | { | |
9466a1cc | 193 | mptcp_join_cookie_init(); |
784325e9 MB |
194 | mptcp_proto_init(); |
195 | ||
196 | if (register_pernet_subsys(&mptcp_pernet_ops) < 0) | |
197 | panic("Failed to register MPTCP pernet subsystem.\n"); | |
198 | } | |
199 | ||
200 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
201 | int __init mptcpv6_init(void) | |
202 | { | |
203 | int err; | |
204 | ||
205 | err = mptcp_proto_v6_init(); | |
206 | ||
207 | return err; | |
208 | } | |
209 | #endif |