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v4.10.11
  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
 
 
 
 
 29static struct ctl_table_set *
 30net_ctl_header_lookup(struct ctl_table_root *root)
 31{
 32	return &current->nsproxy->net_ns->sysctls;
 33}
 34
 35static 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. */
 41static 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
 55static 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
 72static 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
 78static 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
 84static void __net_exit sysctl_net_exit(struct net *net)
 85{
 86	retire_sysctl_set(&net->sysctls);
 87}
 88
 89static struct pernet_operations sysctl_pernet_ops = {
 90	.init = sysctl_net_init,
 91	.exit = sysctl_net_exit,
 92};
 93
 94static 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);
 
 
110out:
111	return ret;
112out1:
113	unregister_sysctl_table(net_header);
114	net_header = NULL;
115	goto out;
116}
 
 
 
 
 
 
 
 
 
 
 
 
117
118struct 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}
123EXPORT_SYMBOL_GPL(register_net_sysctl);
124
125void unregister_net_sysctl_table(struct ctl_table_header *header)
126{
127	unregister_sysctl_table(header);
128}
129EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
v3.1
  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
 32static struct ctl_table_set *
 33net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
 34{
 35	return &namespaces->net_ns->sysctls;
 36}
 37
 38static int is_seen(struct ctl_table_set *set)
 39{
 40	return &current->nsproxy->net_ns->sysctls == set;
 41}
 42
 43/* Return standard mode bits for table entry. */
 44static 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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 56static struct ctl_table_root net_sysctl_root = {
 57	.lookup = net_ctl_header_lookup,
 58	.permissions = net_ctl_permissions,
 59};
 60
 61static int net_ctl_ro_header_perms(struct ctl_table_root *root,
 62		struct nsproxy *namespaces, struct ctl_table *table)
 63{
 64	if (net_eq(namespaces->net_ns, &init_net))
 65		return table->mode;
 66	else
 67		return table->mode & ~0222;
 68}
 69
 70static struct ctl_table_root net_sysctl_ro_root = {
 71	.permissions = net_ctl_ro_header_perms,
 72};
 73
 74static int __net_init 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
 82static void __net_exit sysctl_net_exit(struct net *net)
 83{
 84	WARN_ON(!list_empty(&net->sysctls.list));
 85}
 86
 87static struct pernet_operations sysctl_pernet_ops = {
 88	.init = sysctl_net_init,
 89	.exit = sysctl_net_exit,
 90};
 91
 92static __init int sysctl_init(void)
 
 93{
 94	int ret;
 
 
 
 
 
 
 
 
 95	ret = register_pernet_subsys(&sysctl_pernet_ops);
 96	if (ret)
 97		goto out;
 98	register_sysctl_root(&net_sysctl_root);
 99	setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL);
100	register_sysctl_root(&net_sysctl_ro_root);
101out:
102	return ret;
 
 
 
 
103}
104subsys_initcall(sysctl_init);
105
106struct ctl_table_header *register_net_sysctl_table(struct net *net,
107	const struct ctl_path *path, struct ctl_table *table)
108{
109	struct nsproxy namespaces;
110	namespaces = *current->nsproxy;
111	namespaces.net_ns = net;
112	return __register_sysctl_paths(&net_sysctl_root,
113					&namespaces, path, table);
114}
115EXPORT_SYMBOL_GPL(register_net_sysctl_table);
116
117struct ctl_table_header *register_net_sysctl_rotable(const
118		struct ctl_path *path, struct ctl_table *table)
119{
120	return __register_sysctl_paths(&net_sysctl_ro_root,
121			&init_nsproxy, path, table);
122}
123EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
124
125void unregister_net_sysctl_table(struct ctl_table_header *header)
126{
127	unregister_sysctl_table(header);
128}
129EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);