Add helper functions for sysctl registration with optional instantiating of common path elements (like net/netfilter) and use it for support for automatic registation of conntrack protocol sysctls. Signed-off-by: Patrick McHardy <kaber@trash.net>
134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
/* nf_sysctl.c netfilter sysctl registration/unregistation
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*
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* Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/module.h>
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#include <linux/sysctl.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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static void
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path_free(struct ctl_table *path, struct ctl_table *table)
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{
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struct ctl_table *t, *next;
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for (t = path; t != NULL && t != table; t = next) {
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next = t->child;
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kfree(t);
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}
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}
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static struct ctl_table *
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path_dup(struct ctl_table *path, struct ctl_table *table)
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{
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struct ctl_table *t, *last = NULL, *tmp;
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for (t = path; t != NULL; t = t->child) {
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/* twice the size since path elements are terminated by an
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* empty element */
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tmp = kmemdup(t, 2 * sizeof(*t), GFP_KERNEL);
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if (tmp == NULL) {
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if (last != NULL)
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path_free(path, table);
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return NULL;
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}
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if (last != NULL)
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last->child = tmp;
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else
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path = tmp;
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last = tmp;
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}
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if (last != NULL)
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last->child = table;
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else
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path = table;
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return path;
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}
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struct ctl_table_header *
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nf_register_sysctl_table(struct ctl_table *path, struct ctl_table *table)
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{
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struct ctl_table_header *header;
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path = path_dup(path, table);
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if (path == NULL)
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return NULL;
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header = register_sysctl_table(path, 0);
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if (header == NULL)
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path_free(path, table);
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return header;
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}
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EXPORT_SYMBOL_GPL(nf_register_sysctl_table);
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void
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nf_unregister_sysctl_table(struct ctl_table_header *header,
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struct ctl_table *table)
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{
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struct ctl_table *path = header->ctl_table;
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unregister_sysctl_table(header);
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path_free(path, table);
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}
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EXPORT_SYMBOL_GPL(nf_unregister_sysctl_table);
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/* net/netfilter */
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static struct ctl_table nf_net_netfilter_table[] = {
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{
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.ctl_name = NET_NETFILTER,
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.procname = "netfilter",
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.mode = 0555,
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},
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{
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.ctl_name = 0
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}
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};
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struct ctl_table nf_net_netfilter_sysctl_path[] = {
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{
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.ctl_name = CTL_NET,
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.procname = "net",
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.mode = 0555,
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.child = nf_net_netfilter_table,
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},
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{
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.ctl_name = 0
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}
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};
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EXPORT_SYMBOL_GPL(nf_net_netfilter_sysctl_path);
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/* net/ipv4/netfilter */
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static struct ctl_table nf_net_ipv4_netfilter_table[] = {
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{
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.ctl_name = NET_IPV4_NETFILTER,
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.procname = "netfilter",
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.mode = 0555,
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},
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{
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.ctl_name = 0
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}
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};
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static struct ctl_table nf_net_ipv4_table[] = {
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{
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.ctl_name = NET_IPV4,
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.procname = "ipv4",
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.mode = 0555,
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.child = nf_net_ipv4_netfilter_table,
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},
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{
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.ctl_name = 0
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}
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};
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struct ctl_table nf_net_ipv4_netfilter_sysctl_path[] = {
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{
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.ctl_name = CTL_NET,
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.procname = "net",
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.mode = 0555,
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.child = nf_net_ipv4_table,
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},
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{
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.ctl_name = 0
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}
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};
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EXPORT_SYMBOL_GPL(nf_net_ipv4_netfilter_sysctl_path);
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