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 15 #include <linux/mm.h> 16 #include <linux/sysctl.h> 17 #include <linux/nsproxy.h> 18 19 #include <net/sock.h> 20 21 #ifdef CONFIG_INET 22 #include <net/ip.h> 23 #endif 24 25 #ifdef CONFIG_NET 26 #include <linux/if_ether.h> 27 #endif 28 29 #ifdef CONFIG_TR 30 #include <linux/if_tr.h> 31 #endif 32 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 43 static int sysctl_net_init(struct net *net) 44 { 45 INIT_LIST_HEAD(&net->sysctl_table_headers); 46 return 0; 47 } 48 49 static void sysctl_net_exit(struct net *net) 50 { 51 WARN_ON(!list_empty(&net->sysctl_table_headers)); 52 return; 53 } 54 55 static struct pernet_operations sysctl_pernet_ops = { 56 .init = sysctl_net_init, 57 .exit = sysctl_net_exit, 58 }; 59 60 static __init int sysctl_init(void) 61 { 62 int ret; 63 ret = register_pernet_subsys(&sysctl_pernet_ops); 64 if (ret) 65 goto out; 66 register_sysctl_root(&net_sysctl_root); 67 out: 68 return ret; 69 } 70 subsys_initcall(sysctl_init); 71 72 struct ctl_table_header *register_net_sysctl_table(struct net *net, 73 const struct ctl_path *path, struct ctl_table *table) 74 { 75 struct nsproxy namespaces; 76 namespaces = *current->nsproxy; 77 namespaces.net_ns = net; 78 return __register_sysctl_paths(&net_sysctl_root, 79 &namespaces, path, table); 80 } 81 EXPORT_SYMBOL_GPL(register_net_sysctl_table); 82 83 void unregister_net_sysctl_table(struct ctl_table_header *header) 84 { 85 return unregister_sysctl_table(header); 86 } 87 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table); 88