cache: filter out tables that are not requested

Do not fetch table content for list commands that specify a
table name, e.g.

 # nft list table filter

This speeds up listing of a given table by not populating the
cache with tables that are not needed.

 - Full ruleset (huge with ~100k lines).

 # sudo nft list ruleset &> /dev/null
 real    0m3,049s
 user    0m2,080s
 sys     0m0,968s

- Listing per table is now faster:

 # nft list table nat &> /dev/null
 real    0m1,969s
 user    0m1,412s
 sys     0m0,556s

 # nft list table filter &> /dev/null
 real    0m0,697s
 user    0m0,478s
 sys     0m0,220s

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1326
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cmd.c b/src/cmd.c
index d956919b..f6a8aa11 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -81,7 +81,7 @@ static int nft_cmd_enoent_rule(struct netlink_ctx *ctx, const struct cmd *cmd,
 	const struct table *table = NULL;
 	struct chain *chain;
 
-	if (nft_cache_update(ctx->nft, flags, ctx->msgs) < 0)
+	if (nft_cache_update(ctx->nft, flags, ctx->msgs, NULL) < 0)
 		return 0;
 
 	chain = chain_lookup_fuzzy(&cmd->handle, &ctx->nft->cache, &table);