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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; | |
6bb63ccc MM |
19 | |
20 | #ifdef CONFIG_SYSCTL | |
21 | static int mptcp_pm_type_max = __MPTCP_PM_TYPE_MAX; | |
22 | #endif | |
23 | ||
784325e9 | 24 | struct mptcp_pernet { |
804c72ee | 25 | #ifdef CONFIG_SYSCTL |
784325e9 | 26 | struct ctl_table_header *ctl_table_hdr; |
804c72ee | 27 | #endif |
784325e9 | 28 | |
93f323b9 | 29 | unsigned int add_addr_timeout; |
ff5a0b42 | 30 | unsigned int stale_loss_cnt; |
6da14d74 | 31 | u8 mptcp_enabled; |
fc3c82ee | 32 | u8 checksum_enabled; |
d2f77960 | 33 | u8 allow_join_initial_addr_port; |
6bb63ccc | 34 | u8 pm_type; |
784325e9 MB |
35 | }; |
36 | ||
6da14d74 | 37 | static struct mptcp_pernet *mptcp_get_pernet(const struct net *net) |
784325e9 MB |
38 | { |
39 | return net_generic(net, mptcp_pernet_id); | |
40 | } | |
41 | ||
6da14d74 | 42 | int mptcp_is_enabled(const struct net *net) |
784325e9 MB |
43 | { |
44 | return mptcp_get_pernet(net)->mptcp_enabled; | |
45 | } | |
46 | ||
6da14d74 | 47 | unsigned int mptcp_get_add_addr_timeout(const struct net *net) |
93f323b9 GT |
48 | { |
49 | return mptcp_get_pernet(net)->add_addr_timeout; | |
50 | } | |
51 | ||
6da14d74 | 52 | int mptcp_is_checksum_enabled(const struct net *net) |
fc3c82ee GT |
53 | { |
54 | return mptcp_get_pernet(net)->checksum_enabled; | |
55 | } | |
56 | ||
6da14d74 | 57 | int mptcp_allow_join_id0(const struct net *net) |
d2f77960 GT |
58 | { |
59 | return mptcp_get_pernet(net)->allow_join_initial_addr_port; | |
60 | } | |
61 | ||
ff5a0b42 PA |
62 | unsigned int mptcp_stale_loss_cnt(const struct net *net) |
63 | { | |
64 | return mptcp_get_pernet(net)->stale_loss_cnt; | |
65 | } | |
66 | ||
6bb63ccc MM |
67 | int mptcp_get_pm_type(const struct net *net) |
68 | { | |
69 | return mptcp_get_pernet(net)->pm_type; | |
70 | } | |
71 | ||
804c72ee MB |
72 | static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) |
73 | { | |
74 | pernet->mptcp_enabled = 1; | |
75 | pernet->add_addr_timeout = TCP_RTO_MAX; | |
fc3c82ee | 76 | pernet->checksum_enabled = 0; |
d2f77960 | 77 | pernet->allow_join_initial_addr_port = 1; |
ff5a0b42 | 78 | pernet->stale_loss_cnt = 4; |
6bb63ccc | 79 | pernet->pm_type = MPTCP_PM_TYPE_KERNEL; |
804c72ee MB |
80 | } |
81 | ||
82 | #ifdef CONFIG_SYSCTL | |
784325e9 MB |
83 | static struct ctl_table mptcp_sysctl_table[] = { |
84 | { | |
85 | .procname = "enabled", | |
744ee140 | 86 | .maxlen = sizeof(u8), |
784325e9 MB |
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 | */ | |
744ee140 MB |
91 | .proc_handler = proc_dou8vec_minmax, |
92 | .extra1 = SYSCTL_ZERO, | |
93 | .extra2 = SYSCTL_ONE | |
784325e9 | 94 | }, |
93f323b9 GT |
95 | { |
96 | .procname = "add_addr_timeout", | |
97 | .maxlen = sizeof(unsigned int), | |
98 | .mode = 0644, | |
99 | .proc_handler = proc_dointvec_jiffies, | |
100 | }, | |
fc3c82ee GT |
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 | }, | |
d2f77960 GT |
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 | }, | |
ff5a0b42 PA |
117 | { |
118 | .procname = "stale_loss_cnt", | |
119 | .maxlen = sizeof(unsigned int), | |
120 | .mode = 0644, | |
121 | .proc_handler = proc_douintvec_minmax, | |
122 | }, | |
6bb63ccc MM |
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 | }, | |
784325e9 MB |
131 | {} |
132 | }; | |
133 | ||
784325e9 MB |
134 | static 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; | |
93f323b9 | 147 | table[1].data = &pernet->add_addr_timeout; |
fc3c82ee | 148 | table[2].data = &pernet->checksum_enabled; |
d2f77960 | 149 | table[3].data = &pernet->allow_join_initial_addr_port; |
ff5a0b42 | 150 | table[4].data = &pernet->stale_loss_cnt; |
6bb63ccc | 151 | table[5].data = &pernet->pm_type; |
784325e9 MB |
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 | ||
161 | err_reg: | |
162 | if (!net_eq(net, &init_net)) | |
163 | kfree(table); | |
164 | err_alloc: | |
165 | return -ENOMEM; | |
166 | } | |
167 | ||
168 | static 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 | ||
804c72ee MB |
177 | #else |
178 | ||
179 | static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) | |
180 | { | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {} | |
185 | ||
186 | #endif /* CONFIG_SYSCTL */ | |
187 | ||
784325e9 MB |
188 | static 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 */ | |
198 | static 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 | ||
205 | static 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 | ||
212 | void __init mptcp_init(void) | |
213 | { | |
9466a1cc | 214 | mptcp_join_cookie_init(); |
784325e9 MB |
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) | |
222 | int __init mptcpv6_init(void) | |
223 | { | |
224 | int err; | |
225 | ||
226 | err = mptcp_proto_v6_init(); | |
227 | ||
228 | return err; | |
229 | } | |
230 | #endif |