1 /* -*- linux-c -*-
2 * sysctl_net_core.c: sysctl interface to net core subsystem.
3 *
4 * Begun April 1, 1996, Mike Shaver.
5 * Added /proc/sys/net/core directory entry (empty =) ). [MS]
6 */
7
8 #include <linux/mm.h>
9 #include <linux/sysctl.h>
10 #include <linux/module.h>
11 #include <linux/socket.h>
12 #include <linux/netdevice.h>
13 #include <linux/init.h>
14 #include <net/ip.h>
15 #include <net/sock.h>
16
17 static struct ctl_table net_core_table[] = {
18 #ifdef CONFIG_NET
19 {
20 .ctl_name = NET_CORE_WMEM_MAX,
21 .procname = "wmem_max",
22 .data = &sysctl_wmem_max,
23 .maxlen = sizeof(int),
24 .mode = 0644,
25 .proc_handler = proc_dointvec
26 },
27 {
28 .ctl_name = NET_CORE_RMEM_MAX,
29 .procname = "rmem_max",
30 .data = &sysctl_rmem_max,
31 .maxlen = sizeof(int),
32 .mode = 0644,
33 .proc_handler = proc_dointvec
34 },
35 {
36 .ctl_name = NET_CORE_WMEM_DEFAULT,
37 .procname = "wmem_default",
38 .data = &sysctl_wmem_default,
39 .maxlen = sizeof(int),
40 .mode = 0644,
41 .proc_handler = proc_dointvec
42 },
43 {
44 .ctl_name = NET_CORE_RMEM_DEFAULT,
45 .procname = "rmem_default",
46 .data = &sysctl_rmem_default,
47 .maxlen = sizeof(int),
48 .mode = 0644,
49 .proc_handler = proc_dointvec
50 },
51 {
52 .ctl_name = NET_CORE_DEV_WEIGHT,
53 .procname = "dev_weight",
54 .data = &weight_p,
55 .maxlen = sizeof(int),
56 .mode = 0644,
57 .proc_handler = proc_dointvec
58 },
59 {
60 .ctl_name = NET_CORE_MAX_BACKLOG,
61 .procname = "netdev_max_backlog",
62 .data = &netdev_max_backlog,
63 .maxlen = sizeof(int),
64 .mode = 0644,
65 .proc_handler = proc_dointvec
66 },
67 {
68 .ctl_name = NET_CORE_MSG_COST,
69 .procname = "message_cost",
70 .data = &net_ratelimit_state.interval,
71 .maxlen = sizeof(int),
72 .mode = 0644,
73 .proc_handler = proc_dointvec_jiffies,
74 .strategy = sysctl_jiffies,
75 },
76 {
77 .ctl_name = NET_CORE_MSG_BURST,
78 .procname = "message_burst",
79 .data = &net_ratelimit_state.burst,
80 .maxlen = sizeof(int),
81 .mode = 0644,
82 .proc_handler = proc_dointvec,
83 },
84 {
85 .ctl_name = NET_CORE_OPTMEM_MAX,
86 .procname = "optmem_max",
87 .data = &sysctl_optmem_max,
88 .maxlen = sizeof(int),
89 .mode = 0644,
90 .proc_handler = proc_dointvec
91 },
92 #endif /* CONFIG_NET */
93 {
94 .ctl_name = NET_CORE_BUDGET,
95 .procname = "netdev_budget",
96 .data = &netdev_budget,
97 .maxlen = sizeof(int),
98 .mode = 0644,
99 .proc_handler = proc_dointvec
100 },
101 {
102 .ctl_name = NET_CORE_WARNINGS,
103 .procname = "warnings",
104 .data = &net_msg_warn,
105 .maxlen = sizeof(int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec
108 },
109 { .ctl_name = 0 }
110 };
111
112 static struct ctl_table netns_core_table[] = {
113 {
114 .ctl_name = NET_CORE_SOMAXCONN,
115 .procname = "somaxconn",
116 .data = &init_net.core.sysctl_somaxconn,
117 .maxlen = sizeof(int),
118 .mode = 0644,
119 .proc_handler = proc_dointvec
120 },
121 { .ctl_name = 0 }
122 };
123
124 __net_initdata struct ctl_path net_core_path[] = {
125 { .procname = "net", .ctl_name = CTL_NET, },
126 { .procname = "core", .ctl_name = NET_CORE, },
127 { },
128 };
129
130 static __net_init int sysctl_core_net_init(struct net *net)
131 {
132 struct ctl_table *tbl;
133
134 net->core.sysctl_somaxconn = SOMAXCONN;
135
136 tbl = netns_core_table;
137 if (net != &init_net) {
138 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
139 if (tbl == NULL)
140 goto err_dup;
141
142 tbl[0].data = &net->core.sysctl_somaxconn;
143 }
144
145 net->core.sysctl_hdr = register_net_sysctl_table(net,
146 net_core_path, tbl);
147 if (net->core.sysctl_hdr == NULL)
148 goto err_reg;
149
150 return 0;
151
152 err_reg:
153 if (tbl != netns_core_table)
154 kfree(tbl);
155 err_dup:
156 return -ENOMEM;
157 }
158
159 static __net_exit void sysctl_core_net_exit(struct net *net)
160 {
161 struct ctl_table *tbl;
162
163 tbl = net->core.sysctl_hdr->ctl_table_arg;
164 unregister_net_sysctl_table(net->core.sysctl_hdr);
165 BUG_ON(tbl == netns_core_table);
166 kfree(tbl);
167 }
168
169 static __net_initdata struct pernet_operations sysctl_core_ops = {
170 .init = sysctl_core_net_init,
171 .exit = sysctl_core_net_exit,
172 };
173
174 static __init int sysctl_core_init(void)
175 {
176 static struct ctl_table empty[1];
177
178 register_sysctl_paths(net_core_path, empty);
179 register_net_sysctl_rotable(net_core_path, net_core_table);
180 return register_pernet_subsys(&sysctl_core_ops);
181 }
182
183 fs_initcall(sysctl_core_init);
184
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