Commit 1ef4d6d1 authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
Browse files

netfilter: x_tables: add xt_find_table 



This will be used to obtain the xt_table struct given address family and
table name.

Followup patches will reduce the number of direct accesses to the xt_table
structures via net->ipv{4,6}.ip(6)table_{nat,mangle,...} pointers, then
remove them.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 7716bf09

include/linux/netfilter/x_tables.h

+1 −0
Original line number Diff line number Diff line
@@ -322,6 +322,7 @@ struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision); 
int xt_find_revision(u8 af, const char *name, u8 revision, int target,

		     int *err);



struct xt_table *xt_find_table(struct net *net, u8 af, const char *name);

struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,

				    const char *name);

struct xt_table *xt_request_find_table_lock(struct net *net, u_int8_t af,

net/netfilter/x_tables.c

+17 −0
Original line number Diff line number Diff line
@@ -1199,6 +1199,23 @@ void xt_free_table_info(struct xt_table_info *info) 
}

EXPORT_SYMBOL(xt_free_table_info);



struct xt_table *xt_find_table(struct net *net, u8 af, const char *name)

{

	struct xt_pernet *xt_net = net_generic(net, xt_pernet_id);

	struct xt_table *t;



	mutex_lock(&xt[af].mutex);

	list_for_each_entry(t, &xt_net->tables[af], list) {

		if (strcmp(t->name, name) == 0) {

			mutex_unlock(&xt[af].mutex);

			return t;

		}

	}

	mutex_unlock(&xt[af].mutex);

	return NULL;

}

EXPORT_SYMBOL(xt_find_table);



/* Find table by name, grabs mutex & ref.  Returns ERR_PTR on error. */

struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,

				    const char *name)