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Linux/net/sysctl_net.c

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  1 /* -*- linux-c -*-
  2  * sysctl_net.c: sysctl interface to net subsystem.
  3  *
  4  * Begun April 1, 1996, Mike Shaver.
  5  * Added /proc/sys/net directories for each protocol family. [MS]
  6  *
  7  * Revision 1.2  1996/05/08  20:24:40  shaver
  8  * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
  9  * NET_IPV4_IP_FORWARD.
 10  *
 11  *
 12  */
 13 
 14 #include <linux/mm.h>
 15 #include <linux/sysctl.h>
 16 #include <linux/nsproxy.h>
 17 
 18 #include <net/sock.h>
 19 
 20 #ifdef CONFIG_INET
 21 #include <net/ip.h>
 22 #endif
 23 
 24 #ifdef CONFIG_NET
 25 #include <linux/if_ether.h>
 26 #endif
 27 
 28 #ifdef CONFIG_TR
 29 #include <linux/if_tr.h>
 30 #endif
 31 
 32 static struct ctl_table_set *
 33 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
 34 {
 35         return &namespaces->net_ns->sysctls;
 36 }
 37 
 38 static int is_seen(struct ctl_table_set *set)
 39 {
 40         return &current->nsproxy->net_ns->sysctls == set;
 41 }
 42 
 43 /* Return standard mode bits for table entry. */
 44 static int net_ctl_permissions(struct ctl_table_root *root,
 45                                struct nsproxy *nsproxy,
 46                                struct ctl_table *table)
 47 {
 48         /* Allow network administrator to have same access as root. */
 49         if (capable(CAP_NET_ADMIN)) {
 50                 int mode = (table->mode >> 6) & 7;
 51                 return (mode << 6) | (mode << 3) | mode;
 52         }
 53         return table->mode;
 54 }
 55 
 56 static struct ctl_table_root net_sysctl_root = {
 57         .lookup = net_ctl_header_lookup,
 58         .permissions = net_ctl_permissions,
 59 };
 60 
 61 static int net_ctl_ro_header_perms(struct ctl_table_root *root,
 62                 struct nsproxy *namespaces, struct ctl_table *table)
 63 {
 64         if (net_eq(namespaces->net_ns, &init_net))
 65                 return table->mode;
 66         else
 67                 return table->mode & ~0222;
 68 }
 69 
 70 static struct ctl_table_root net_sysctl_ro_root = {
 71         .permissions = net_ctl_ro_header_perms,
 72 };
 73 
 74 static int sysctl_net_init(struct net *net)
 75 {
 76         setup_sysctl_set(&net->sysctls,
 77                          &net_sysctl_ro_root.default_set,
 78                          is_seen);
 79         return 0;
 80 }
 81 
 82 static void sysctl_net_exit(struct net *net)
 83 {
 84         WARN_ON(!list_empty(&net->sysctls.list));
 85         return;
 86 }
 87 
 88 static struct pernet_operations sysctl_pernet_ops = {
 89         .init = sysctl_net_init,
 90         .exit = sysctl_net_exit,
 91 };
 92 
 93 static __init int sysctl_init(void)
 94 {
 95         int ret;
 96         ret = register_pernet_subsys(&sysctl_pernet_ops);
 97         if (ret)
 98                 goto out;
 99         register_sysctl_root(&net_sysctl_root);
100         setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL);
101         register_sysctl_root(&net_sysctl_ro_root);
102 out:
103         return ret;
104 }
105 subsys_initcall(sysctl_init);
106 
107 struct ctl_table_header *register_net_sysctl_table(struct net *net,
108         const struct ctl_path *path, struct ctl_table *table)
109 {
110         struct nsproxy namespaces;
111         namespaces = *current->nsproxy;
112         namespaces.net_ns = net;
113         return __register_sysctl_paths(&net_sysctl_root,
114                                         &namespaces, path, table);
115 }
116 EXPORT_SYMBOL_GPL(register_net_sysctl_table);
117 
118 struct ctl_table_header *register_net_sysctl_rotable(const
119                 struct ctl_path *path, struct ctl_table *table)
120 {
121         return __register_sysctl_paths(&net_sysctl_ro_root,
122                         &init_nsproxy, path, table);
123 }
124 EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
125 
126 void unregister_net_sysctl_table(struct ctl_table_header *header)
127 {
128         unregister_sysctl_table(header);
129 }
130 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
131 

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