| 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 ¤t->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 (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); |