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Linux/net/sysctl_net.c

  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)
 31 {
 32         return &current->nsproxy->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 
 46         /* Allow network administrator to have same access as root. */
 47         if (ns_capable_noaudit(net->user_ns, CAP_NET_ADMIN)) {
 48                 int mode = (table->mode >> 6) & 7;
 49                 return (mode << 6) | (mode << 3) | mode;
 50         }
 51 
 52         return table->mode;
 53 }
 54 
 55 static void net_ctl_set_ownership(struct ctl_table_header *head,
 56                                   struct ctl_table *table,
 57                                   kuid_t *uid, kgid_t *gid)
 58 {
 59         struct net *net = container_of(head->set, struct net, sysctls);
 60         kuid_t ns_root_uid;
 61         kgid_t ns_root_gid;
 62 
 63         ns_root_uid = make_kuid(net->user_ns, 0);
 64         if (uid_valid(ns_root_uid))
 65                 *uid = ns_root_uid;
 66 
 67         ns_root_gid = make_kgid(net->user_ns, 0);
 68         if (gid_valid(ns_root_gid))
 69                 *gid = ns_root_gid;
 70 }
 71 
 72 static struct ctl_table_root net_sysctl_root = {
 73         .lookup = net_ctl_header_lookup,
 74         .permissions = net_ctl_permissions,
 75         .set_ownership = net_ctl_set_ownership,
 76 };
 77 
 78 static int __net_init sysctl_net_init(struct net *net)
 79 {
 80         setup_sysctl_set(&net->sysctls, &net_sysctl_root, is_seen);
 81         return 0;
 82 }
 83 
 84 static void __net_exit sysctl_net_exit(struct net *net)
 85 {
 86         retire_sysctl_set(&net->sysctls);
 87 }
 88 
 89 static struct pernet_operations sysctl_pernet_ops = {
 90         .init = sysctl_net_init,
 91         .exit = sysctl_net_exit,
 92 };
 93 
 94 static struct ctl_table_header *net_header;
 95 __init int net_sysctl_init(void)
 96 {
 97         static struct ctl_table empty[1];
 98         int ret = -ENOMEM;
 99         /* Avoid limitations in the sysctl implementation by
100          * registering "/proc/sys/net" as an empty directory not in a
101          * network namespace.
102          */
103         net_header = register_sysctl("net", empty);
104         if (!net_header)
105                 goto out;
106         ret = register_pernet_subsys(&sysctl_pernet_ops);
107         if (ret)
108                 goto out1;
109         register_sysctl_root(&net_sysctl_root);
110 out:
111         return ret;
112 out1:
113         unregister_sysctl_table(net_header);
114         net_header = NULL;
115         goto out;
116 }
117 
118 struct ctl_table_header *register_net_sysctl(struct net *net,
119         const char *path, struct ctl_table *table)
120 {
121         return __register_sysctl_table(&net->sysctls, path, table);
122 }
123 EXPORT_SYMBOL_GPL(register_net_sysctl);
124 
125 void unregister_net_sysctl_table(struct ctl_table_header *header)
126 {
127         unregister_sysctl_table(header);
128 }
129 EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
130 

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