Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6
[linux-2.6.git] / net / core / sysctl_net_core.c
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/ratelimit.h>
14 #include <linux/init.h>
15
16 #include <net/ip.h>
17 #include <net/sock.h>
18
19 static struct ctl_table net_core_table[] = {
20 #ifdef CONFIG_NET
21         {
22                 .procname       = "wmem_max",
23                 .data           = &sysctl_wmem_max,
24                 .maxlen         = sizeof(int),
25                 .mode           = 0644,
26                 .proc_handler   = proc_dointvec
27         },
28         {
29                 .procname       = "rmem_max",
30                 .data           = &sysctl_rmem_max,
31                 .maxlen         = sizeof(int),
32                 .mode           = 0644,
33                 .proc_handler   = proc_dointvec
34         },
35         {
36                 .procname       = "wmem_default",
37                 .data           = &sysctl_wmem_default,
38                 .maxlen         = sizeof(int),
39                 .mode           = 0644,
40                 .proc_handler   = proc_dointvec
41         },
42         {
43                 .procname       = "rmem_default",
44                 .data           = &sysctl_rmem_default,
45                 .maxlen         = sizeof(int),
46                 .mode           = 0644,
47                 .proc_handler   = proc_dointvec
48         },
49         {
50                 .procname       = "dev_weight",
51                 .data           = &weight_p,
52                 .maxlen         = sizeof(int),
53                 .mode           = 0644,
54                 .proc_handler   = proc_dointvec
55         },
56         {
57                 .procname       = "netdev_max_backlog",
58                 .data           = &netdev_max_backlog,
59                 .maxlen         = sizeof(int),
60                 .mode           = 0644,
61                 .proc_handler   = proc_dointvec
62         },
63         {
64                 .procname       = "message_cost",
65                 .data           = &net_ratelimit_state.interval,
66                 .maxlen         = sizeof(int),
67                 .mode           = 0644,
68                 .proc_handler   = proc_dointvec_jiffies,
69         },
70         {
71                 .procname       = "message_burst",
72                 .data           = &net_ratelimit_state.burst,
73                 .maxlen         = sizeof(int),
74                 .mode           = 0644,
75                 .proc_handler   = proc_dointvec,
76         },
77         {
78                 .procname       = "optmem_max",
79                 .data           = &sysctl_optmem_max,
80                 .maxlen         = sizeof(int),
81                 .mode           = 0644,
82                 .proc_handler   = proc_dointvec
83         },
84 #endif /* CONFIG_NET */
85         {
86                 .procname       = "netdev_budget",
87                 .data           = &netdev_budget,
88                 .maxlen         = sizeof(int),
89                 .mode           = 0644,
90                 .proc_handler   = proc_dointvec
91         },
92         {
93                 .procname       = "warnings",
94                 .data           = &net_msg_warn,
95                 .maxlen         = sizeof(int),
96                 .mode           = 0644,
97                 .proc_handler   = proc_dointvec
98         },
99         { }
100 };
101
102 static struct ctl_table netns_core_table[] = {
103         {
104                 .procname       = "somaxconn",
105                 .data           = &init_net.core.sysctl_somaxconn,
106                 .maxlen         = sizeof(int),
107                 .mode           = 0644,
108                 .proc_handler   = proc_dointvec
109         },
110         { }
111 };
112
113 __net_initdata struct ctl_path net_core_path[] = {
114         { .procname = "net", },
115         { .procname = "core", },
116         { },
117 };
118
119 static __net_init int sysctl_core_net_init(struct net *net)
120 {
121         struct ctl_table *tbl;
122
123         net->core.sysctl_somaxconn = SOMAXCONN;
124
125         tbl = netns_core_table;
126         if (net != &init_net) {
127                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
128                 if (tbl == NULL)
129                         goto err_dup;
130
131                 tbl[0].data = &net->core.sysctl_somaxconn;
132         }
133
134         net->core.sysctl_hdr = register_net_sysctl_table(net,
135                         net_core_path, tbl);
136         if (net->core.sysctl_hdr == NULL)
137                 goto err_reg;
138
139         return 0;
140
141 err_reg:
142         if (tbl != netns_core_table)
143                 kfree(tbl);
144 err_dup:
145         return -ENOMEM;
146 }
147
148 static __net_exit void sysctl_core_net_exit(struct net *net)
149 {
150         struct ctl_table *tbl;
151
152         tbl = net->core.sysctl_hdr->ctl_table_arg;
153         unregister_net_sysctl_table(net->core.sysctl_hdr);
154         BUG_ON(tbl == netns_core_table);
155         kfree(tbl);
156 }
157
158 static __net_initdata struct pernet_operations sysctl_core_ops = {
159         .init = sysctl_core_net_init,
160         .exit = sysctl_core_net_exit,
161 };
162
163 static __init int sysctl_core_init(void)
164 {
165         static struct ctl_table empty[1];
166
167         register_sysctl_paths(net_core_path, empty);
168         register_net_sysctl_rotable(net_core_path, net_core_table);
169         return register_pernet_subsys(&sysctl_core_ops);
170 }
171
172 fs_initcall(sysctl_core_init);