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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/export.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 static struct ctl_table_set *
 30 net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
 31 {
 32         return &namespaces->net_ns->sysctls;
 33 }
 34 
 35 static int is_seen(struct ctl_table_set *set)
 36 {
 37         return &current->nsproxy->net_ns->sysctls == set;
 38 }
 39 
 40 /* Return standard mode bits for table entry. */
 41 static int net_ctl_permissions(struct ctl_table_header *head,
 42                                struct ctl_table *table)
 43 {
 44         struct net *net = container_of(head->set, struct net, sysctls);
 45         kuid_t root_uid = make_kuid(net->user_ns, 0);
 46         kgid_t root_gid = make_kgid(net->user_ns, 0);
 47 
 48         /* Allow network administrator to have same access as root. */
 49         if (ns_capable_noaudit(net->user_ns, CAP_NET_ADMIN) ||
 50             uid_eq(root_uid, current_euid())) {
 51                 int mode = (table->mode >> 6) & 7;
 52                 return (mode << 6) | (mode << 3) | mode;
 53         }
 54         /* Allow netns root group to have the same access as the root group */
 55         if (in_egroup_p(root_gid)) {
 56                 int mode = (table->mode >> 3) & 7;
 57                 return (mode << 3) | mode;
 58         }
 59         return table->mode;
 60 }
 61 
 62 static struct ctl_table_root net_sysctl_root = {
 63         .lookup = net_ctl_header_lookup,
 64         .permissions = net_ctl_permissions,
 65 };
 66 
 67 static int __net_init sysctl_net_init(struct net *net)
 68 {
 69         setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
 70         return 0;
 71 }
 72 
 73 static void __net_exit sysctl_net_exit(struct net *net)
 74 {
 75         retire_sysctl_set(&net->sysctls);
 76 }
 77 
 78 static struct pernet_operations sysctl_pernet_ops = {
 79         .init = sysctl_net_init,
 80         .exit = sysctl_net_exit,
 81 };
 82 
 83 static struct ctl_table_header *net_header;
 84 __init int net_sysctl_init(void)
 85 {
 86         static struct ctl_table empty[1];
 87         int ret = -ENOMEM;
 88         /* Avoid limitations in the sysctl implementation by
 89          * registering "/proc/sys/net" as an empty directory not in a
 90          * network namespace.
 91          */
 92         net_header = register_sysctl("net", empty);
 93         if (!net_header)
 94                 goto out;
 95         ret = register_pernet_subsys(&sysctl_pernet_ops);
 96         if (ret)
 97                 goto out1;
 98         register_sysctl_root(&net_sysctl_root);
 99 out:
100         return ret;
101 out1:
102         unregister_sysctl_table(net_header);
103         net_header = NULL;
104         goto out;
105 }
106 
107 struct ctl_table_header *register_net_sysctl(struct net *net,
108         const char *path, struct ctl_table *table)
109 {
110         return __register_sysctl_table(&net->sysctls, path, table);
111 }
112 EXPORT_SYMBOL_GPL(register_net_sysctl);
113 
114 void unregister_net_sysctl_table(struct ctl_table_header *header)
115 {
116         unregister_sysctl_table(header);
117 }
118 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
119 

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