meta: skip protocol context update for nfproto with same table family

meta: skip protocol context update for nfproto with same table family

Inefficient bytecode crashes ruleset listing:

[ meta load nfproto => reg 1 ]
[ cmp eq reg 1 0x00000002 ] <-- this specifies NFPROTO_IPV4 but table family is IPv4!
[ payload load 4b @ network header + 12 => reg 1 ]
[ cmp gte reg 1 0x1000000a ]
[ cmp lte reg 1 0x1f00000a ]
[ masq ]

This IPv4 table obviously only see IPv4 traffic, but bytecode specifies
a redundant match on NFPROTO_IPV4.

After this patch, listing works:

 # nft list ruleset
 table ip crash {
        chain crash {
                type nat hook postrouting priority srcnat; policy accept;
                ip saddr 10.0.0.16-10.0.0.31 masquerade
        }
 }

Skip protocol context update in case that this information is redundant.

Fixes: https://bugzilla.netfilter.org/show_bug.cgi?id=1562
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>