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 stale_loss_cnt;
33 u8 allow_join_initial_addr_port;
35 char scheduler[MPTCP_SCHED_NAME_MAX];
38 static struct mptcp_pernet *mptcp_get_pernet(const struct net *net)
40 return net_generic(net, mptcp_pernet_id);
43 int mptcp_is_enabled(const struct net *net)
45 return mptcp_get_pernet(net)->mptcp_enabled;
48 unsigned int mptcp_get_add_addr_timeout(const struct net *net)
50 return mptcp_get_pernet(net)->add_addr_timeout;
53 int mptcp_is_checksum_enabled(const struct net *net)
55 return mptcp_get_pernet(net)->checksum_enabled;
58 int mptcp_allow_join_id0(const struct net *net)
60 return mptcp_get_pernet(net)->allow_join_initial_addr_port;
63 unsigned int mptcp_stale_loss_cnt(const struct net *net)
65 return mptcp_get_pernet(net)->stale_loss_cnt;
68 int mptcp_get_pm_type(const struct net *net)
70 return mptcp_get_pernet(net)->pm_type;
73 const char *mptcp_get_scheduler(const struct net *net)
75 return mptcp_get_pernet(net)->scheduler;
78 static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
80 pernet->mptcp_enabled = 1;
81 pernet->add_addr_timeout = TCP_RTO_MAX;
82 pernet->checksum_enabled = 0;
83 pernet->allow_join_initial_addr_port = 1;
84 pernet->stale_loss_cnt = 4;
85 pernet->pm_type = MPTCP_PM_TYPE_KERNEL;
86 strcpy(pernet->scheduler, "default");
90 static int mptcp_set_scheduler(const struct net *net, const char *name)
92 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
93 struct mptcp_sched_ops *sched;
97 sched = mptcp_sched_find(name);
99 strscpy(pernet->scheduler, name, MPTCP_SCHED_NAME_MAX);
107 static int proc_scheduler(struct ctl_table *ctl, int write,
108 void *buffer, size_t *lenp, loff_t *ppos)
110 const struct net *net = current->nsproxy->net_ns;
111 char val[MPTCP_SCHED_NAME_MAX];
112 struct ctl_table tbl = {
114 .maxlen = MPTCP_SCHED_NAME_MAX,
118 strscpy(val, mptcp_get_scheduler(net), MPTCP_SCHED_NAME_MAX);
120 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
121 if (write && ret == 0)
122 ret = mptcp_set_scheduler(net, val);
127 static struct ctl_table mptcp_sysctl_table[] = {
129 .procname = "enabled",
130 .maxlen = sizeof(u8),
132 /* users with CAP_NET_ADMIN or root (not and) can change this
133 * value, same as other sysctl or the 'net' tree.
135 .proc_handler = proc_dou8vec_minmax,
136 .extra1 = SYSCTL_ZERO,
140 .procname = "add_addr_timeout",
141 .maxlen = sizeof(unsigned int),
143 .proc_handler = proc_dointvec_jiffies,
146 .procname = "checksum_enabled",
147 .maxlen = sizeof(u8),
149 .proc_handler = proc_dou8vec_minmax,
150 .extra1 = SYSCTL_ZERO,
154 .procname = "allow_join_initial_addr_port",
155 .maxlen = sizeof(u8),
157 .proc_handler = proc_dou8vec_minmax,
158 .extra1 = SYSCTL_ZERO,
162 .procname = "stale_loss_cnt",
163 .maxlen = sizeof(unsigned int),
165 .proc_handler = proc_douintvec_minmax,
168 .procname = "pm_type",
169 .maxlen = sizeof(u8),
171 .proc_handler = proc_dou8vec_minmax,
172 .extra1 = SYSCTL_ZERO,
173 .extra2 = &mptcp_pm_type_max
176 .procname = "scheduler",
177 .maxlen = MPTCP_SCHED_NAME_MAX,
179 .proc_handler = proc_scheduler,
184 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
186 struct ctl_table_header *hdr;
187 struct ctl_table *table;
189 table = mptcp_sysctl_table;
190 if (!net_eq(net, &init_net)) {
191 table = kmemdup(table, sizeof(mptcp_sysctl_table), GFP_KERNEL);
196 table[0].data = &pernet->mptcp_enabled;
197 table[1].data = &pernet->add_addr_timeout;
198 table[2].data = &pernet->checksum_enabled;
199 table[3].data = &pernet->allow_join_initial_addr_port;
200 table[4].data = &pernet->stale_loss_cnt;
201 table[5].data = &pernet->pm_type;
202 table[6].data = &pernet->scheduler;
204 hdr = register_net_sysctl_sz(net, MPTCP_SYSCTL_PATH, table,
205 ARRAY_SIZE(mptcp_sysctl_table));
209 pernet->ctl_table_hdr = hdr;
214 if (!net_eq(net, &init_net))
220 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
222 struct ctl_table *table = pernet->ctl_table_hdr->ctl_table_arg;
224 unregister_net_sysctl_table(pernet->ctl_table_hdr);
231 static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
236 static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {}
238 #endif /* CONFIG_SYSCTL */
240 static int __net_init mptcp_net_init(struct net *net)
242 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
244 mptcp_pernet_set_defaults(pernet);
246 return mptcp_pernet_new_table(net, pernet);
249 /* Note: the callback will only be called per extra netns */
250 static void __net_exit mptcp_net_exit(struct net *net)
252 struct mptcp_pernet *pernet = mptcp_get_pernet(net);
254 mptcp_pernet_del_table(pernet);
257 static struct pernet_operations mptcp_pernet_ops = {
258 .init = mptcp_net_init,
259 .exit = mptcp_net_exit,
260 .id = &mptcp_pernet_id,
261 .size = sizeof(struct mptcp_pernet),
264 void __init mptcp_init(void)
266 mptcp_join_cookie_init();
269 if (register_pernet_subsys(&mptcp_pernet_ops) < 0)
270 panic("Failed to register MPTCP pernet subsystem.\n");
273 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
274 int __init mptcpv6_init(void)
278 err = mptcp_proto_v6_init();