[PATCH 31/32] netfilter: nf_tables: add nft_register_basechain() and nft_unregister_basechain()

[Pablo Neira Ayuso]

This wrapper functions take care of hook registration for basechains.

Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/netfilter/nf_tables_api.c |   52 +++++++++++++++++++++++++++++------------
 1 file changed, 37 insertions(+), 15 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 900c81a..c66dc62 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -127,13 +127,38 @@ static void nft_trans_destroy(struct nft_trans *trans)
        kfree(trans);
 }
 
+static int nft_register_basechain(struct nft_base_chain *basechain,
+                                 unsigned int hook_nops)
+{
+       return nf_register_hooks(basechain->ops, hook_nops);
+}
+
+static void nft_unregister_basechain(struct nft_base_chain *basechain,
+                                    unsigned int hook_nops)
+{
+       nf_unregister_hooks(basechain->ops, hook_nops);
+}
+
+static int nf_tables_register_hooks(const struct nft_table *table,
+                                   struct nft_chain *chain,
+                                   unsigned int hook_nops)
+{
+       if (table->flags & NFT_TABLE_F_DORMANT ||
+           !(chain->flags & NFT_BASE_CHAIN))
+               return 0;
+
+       return nft_register_basechain(nft_base_chain(chain), hook_nops);
+}
+
 static void nf_tables_unregister_hooks(const struct nft_table *table,
-                                      const struct nft_chain *chain,
+                                      struct nft_chain *chain,
                                       unsigned int hook_nops)
 {
-       if (!(table->flags & NFT_TABLE_F_DORMANT) &&
-           chain->flags & NFT_BASE_CHAIN)
-               nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
+       if (table->flags & NFT_TABLE_F_DORMANT ||
+           !(chain->flags & NFT_BASE_CHAIN))
+               return;
+
+       nft_unregister_basechain(nft_base_chain(chain), hook_nops);
 }
 
 /* Internal table flags */
@@ -560,7 +585,7 @@ static int nf_tables_table_enable(const struct nft_af_info 
*afi,
                if (!(chain->flags & NFT_BASE_CHAIN))
                        continue;
 
-               err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
+               err = nft_register_basechain(nft_base_chain(chain), afi->nops);
                if (err < 0)
                        goto err;
 
@@ -575,20 +600,20 @@ err:
                if (i-- <= 0)
                        break;
 
-               nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
+               nft_unregister_basechain(nft_base_chain(chain), afi->nops);
        }
        return err;
 }
 
 static void nf_tables_table_disable(const struct nft_af_info *afi,
-                                  struct nft_table *table)
+                                   struct nft_table *table)
 {
        struct nft_chain *chain;
 
        list_for_each_entry(chain, &table->chains, list) {
                if (chain->flags & NFT_BASE_CHAIN)
-                       nf_unregister_hooks(nft_base_chain(chain)->ops,
-                                           afi->nops);
+                       nft_unregister_basechain(nft_base_chain(chain),
+                                                afi->nops);
        }
 }
 
@@ -1421,12 +1446,9 @@ static int nf_tables_newchain(struct sock *nlsk, struct 
sk_buff *skb,
        chain->table = table;
        nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
 
-       if (!(table->flags & NFT_TABLE_F_DORMANT) &&
-           chain->flags & NFT_BASE_CHAIN) {
-               err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
-               if (err < 0)
-                       goto err1;
-       }
+       err = nf_tables_register_hooks(table, chain, afi->nops);
+       if (err < 0)
+               goto err1;
 
        nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
        err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
-- 
1.7.10.4

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