734550921e
New object: set of sysctls [currently - root and per-net-ns]. Contains: pointer to parent set, list of tables and "should I see this set?" method (->is_seen(set)). Current lists of tables are subsumed by that; net-ns contains such a beast. ->lookup() for ctl_table_root returns pointer to ctl_table_set instead of that to ->list of that ctl_table_set. [folded compile fixes by rdd for configs without sysctl] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* -*- linux-c -*-
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* sysctl_net.c: sysctl interface to net subsystem.
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*
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* Begun April 1, 1996, Mike Shaver.
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* Added /proc/sys/net directories for each protocol family. [MS]
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*
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* Revision 1.2 1996/05/08 20:24:40 shaver
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* Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
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* NET_IPV4_IP_FORWARD.
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*
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*
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*/
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#include <linux/mm.h>
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#include <linux/sysctl.h>
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#include <linux/nsproxy.h>
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#include <net/sock.h>
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#ifdef CONFIG_INET
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#include <net/ip.h>
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#endif
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#ifdef CONFIG_NET
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#include <linux/if_ether.h>
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#endif
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#ifdef CONFIG_TR
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#include <linux/if_tr.h>
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#endif
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static struct ctl_table_set *
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net_ctl_header_lookup(struct ctl_table_root *root, struct nsproxy *namespaces)
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{
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return &namespaces->net_ns->sysctls;
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}
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static int is_seen(struct ctl_table_set *set)
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{
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return ¤t->nsproxy->net_ns->sysctls == set;
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}
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/* Return standard mode bits for table entry. */
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static int net_ctl_permissions(struct ctl_table_root *root,
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struct nsproxy *nsproxy,
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struct ctl_table *table)
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{
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/* Allow network administrator to have same access as root. */
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if (capable(CAP_NET_ADMIN)) {
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int mode = (table->mode >> 6) & 7;
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return (mode << 6) | (mode << 3) | mode;
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}
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return table->mode;
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}
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static struct ctl_table_root net_sysctl_root = {
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.lookup = net_ctl_header_lookup,
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.permissions = net_ctl_permissions,
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};
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static int net_ctl_ro_header_perms(struct ctl_table_root *root,
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struct nsproxy *namespaces, struct ctl_table *table)
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{
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if (namespaces->net_ns == &init_net)
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return table->mode;
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else
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return table->mode & ~0222;
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}
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static struct ctl_table_root net_sysctl_ro_root = {
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.permissions = net_ctl_ro_header_perms,
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};
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static int sysctl_net_init(struct net *net)
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{
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setup_sysctl_set(&net->sysctls, NULL, is_seen);
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return 0;
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}
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static void sysctl_net_exit(struct net *net)
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{
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WARN_ON(!list_empty(&net->sysctls.list));
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return;
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}
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static struct pernet_operations sysctl_pernet_ops = {
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.init = sysctl_net_init,
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.exit = sysctl_net_exit,
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};
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static __init int sysctl_init(void)
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{
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int ret;
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ret = register_pernet_subsys(&sysctl_pernet_ops);
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if (ret)
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goto out;
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register_sysctl_root(&net_sysctl_root);
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setup_sysctl_set(&net_sysctl_ro_root.default_set, NULL, NULL);
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register_sysctl_root(&net_sysctl_ro_root);
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out:
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return ret;
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}
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subsys_initcall(sysctl_init);
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struct ctl_table_header *register_net_sysctl_table(struct net *net,
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const struct ctl_path *path, struct ctl_table *table)
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{
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struct nsproxy namespaces;
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namespaces = *current->nsproxy;
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namespaces.net_ns = net;
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return __register_sysctl_paths(&net_sysctl_root,
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&namespaces, path, table);
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}
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EXPORT_SYMBOL_GPL(register_net_sysctl_table);
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struct ctl_table_header *register_net_sysctl_rotable(const
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struct ctl_path *path, struct ctl_table *table)
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{
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return __register_sysctl_paths(&net_sysctl_ro_root,
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&init_nsproxy, path, table);
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}
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EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);
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void unregister_net_sysctl_table(struct ctl_table_header *header)
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{
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unregister_sysctl_table(header);
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}
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EXPORT_SYMBOL_GPL(unregister_net_sysctl_table);
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