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 *
net_ctl_header_lookup(struct ctl_table_root * root)30 net_ctl_header_lookup(struct ctl_table_root *root)
31 {
32 return ¤t->nsproxy->net_ns->sysctls;
33 }
34
is_seen(struct ctl_table_set * set)35 static int is_seen(struct ctl_table_set *set)
36 {
37 return ¤t->nsproxy->net_ns->sysctls == set;
38 }
39
40 /* Return standard mode bits for table entry. */
net_ctl_permissions(struct ctl_table_header * head,struct ctl_table * table)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
net_ctl_set_ownership(struct ctl_table_header * head,struct ctl_table * table,kuid_t * uid,kgid_t * gid)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
sysctl_net_init(struct net * net)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
sysctl_net_exit(struct net * net)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;
net_sysctl_init(void)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
register_net_sysctl(struct net * net,const char * path,struct ctl_table * table)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
unregister_net_sysctl_table(struct ctl_table_header * header)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