Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * $Log: sysctl_net.c,v $ |
| 8 | * Revision 1.2 1996/05/08 20:24:40 shaver |
| 9 | * Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and |
| 10 | * NET_IPV4_IP_FORWARD. |
| 11 | * |
| 12 | * |
| 13 | */ |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/mm.h> |
| 16 | #include <linux/sysctl.h> |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 17 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Russell King | 496a22b | 2005-10-03 14:16:34 -0700 | [diff] [blame] | 19 | #include <net/sock.h> |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #ifdef CONFIG_INET |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 22 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #endif |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #ifdef CONFIG_NET |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 26 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #endif |
| 28 | |
| 29 | #ifdef CONFIG_TR |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 30 | #include <linux/if_tr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #endif |
| 32 | |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 33 | static struct list_head * |
| 34 | net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces) |
| 35 | { |
| 36 | return &namespaces->net_ns->sysctl_table_headers; |
| 37 | } |
| 38 | |
| 39 | static struct ctl_table_root net_sysctl_root = { |
| 40 | .lookup = net_ctl_header_lookup, |
| 41 | }; |
| 42 | |
Pavel Emelyanov | d62c612 | 2008-05-19 13:45:33 -0700 | [diff] [blame] | 43 | static LIST_HEAD(net_sysctl_ro_tables); |
| 44 | static struct list_head *net_ctl_ro_header_lookup(struct ctl_table_root *root, |
| 45 | struct nsproxy *namespaces) |
| 46 | { |
| 47 | return &net_sysctl_ro_tables; |
| 48 | } |
| 49 | |
| 50 | static int net_ctl_ro_header_perms(struct ctl_table_root *root, |
| 51 | struct nsproxy *namespaces, struct ctl_table *table) |
| 52 | { |
| 53 | if (namespaces->net_ns == &init_net) |
| 54 | return table->mode; |
| 55 | else |
| 56 | return table->mode & ~0222; |
| 57 | } |
| 58 | |
| 59 | static struct ctl_table_root net_sysctl_ro_root = { |
| 60 | .lookup = net_ctl_ro_header_lookup, |
| 61 | .permissions = net_ctl_ro_header_perms, |
| 62 | }; |
| 63 | |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 64 | static int sysctl_net_init(struct net *net) |
| 65 | { |
| 66 | INIT_LIST_HEAD(&net->sysctl_table_headers); |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | static void sysctl_net_exit(struct net *net) |
| 71 | { |
| 72 | WARN_ON(!list_empty(&net->sysctl_table_headers)); |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | static struct pernet_operations sysctl_pernet_ops = { |
| 77 | .init = sysctl_net_init, |
| 78 | .exit = sysctl_net_exit, |
| 79 | }; |
| 80 | |
| 81 | static __init int sysctl_init(void) |
| 82 | { |
| 83 | int ret; |
| 84 | ret = register_pernet_subsys(&sysctl_pernet_ops); |
| 85 | if (ret) |
| 86 | goto out; |
| 87 | register_sysctl_root(&net_sysctl_root); |
Pavel Emelyanov | d62c612 | 2008-05-19 13:45:33 -0700 | [diff] [blame] | 88 | register_sysctl_root(&net_sysctl_ro_root); |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 89 | out: |
| 90 | return ret; |
| 91 | } |
| 92 | subsys_initcall(sysctl_init); |
| 93 | |
| 94 | struct ctl_table_header *register_net_sysctl_table(struct net *net, |
| 95 | const struct ctl_path *path, struct ctl_table *table) |
| 96 | { |
| 97 | struct nsproxy namespaces; |
| 98 | namespaces = *current->nsproxy; |
| 99 | namespaces.net_ns = net; |
| 100 | return __register_sysctl_paths(&net_sysctl_root, |
| 101 | &namespaces, path, table); |
| 102 | } |
| 103 | EXPORT_SYMBOL_GPL(register_net_sysctl_table); |
| 104 | |
Pavel Emelyanov | d62c612 | 2008-05-19 13:45:33 -0700 | [diff] [blame] | 105 | struct ctl_table_header *register_net_sysctl_rotable(const |
| 106 | struct ctl_path *path, struct ctl_table *table) |
| 107 | { |
| 108 | return __register_sysctl_paths(&net_sysctl_ro_root, |
| 109 | &init_nsproxy, path, table); |
| 110 | } |
| 111 | EXPORT_SYMBOL_GPL(register_net_sysctl_rotable); |
| 112 | |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 113 | void unregister_net_sysctl_table(struct ctl_table_header *header) |
| 114 | { |
Harvey Harrison | ab59859 | 2008-05-01 02:47:38 -0700 | [diff] [blame] | 115 | unregister_sysctl_table(header); |
Eric W. Biederman | 95bdfcc | 2007-11-30 23:55:42 +1100 | [diff] [blame] | 116 | } |
| 117 | EXPORT_SYMBOL_GPL(unregister_net_sysctl_table); |