netlink_delinerize: incorrect byteorder in mark statement listing

netlink_delinerize: incorrect byteorder in mark statement listing

When using ip dscp in combination with bitwise operation:

 # nft --debug=netlink add rule ip x y 'ct mark set ip dscp | 0x4'
 ip x y
   [ payload load 1b @ network header + 1 => reg 1 ]
   [ bitwise reg 1 = ( reg 1 & 0x000000fc ) ^ 0x00000000 ]
   [ bitwise reg 1 = ( reg 1 >> 0x00000002 ) ]
   [ bitwise reg 1 = ( reg 1 & 0xfffffffb ) ^ 0x00000004 ]
   [ ct set mark with reg 1 ]

the listing is showing in the incorrect byteorder:

 # nft list ruleset
 table ip x {
        chain y {
		ct mark set ip dscp | 0x4000000
	}
 }

handle and and or operations in host byteorder.

The following command:

 # nft --debug=netlink add rule ip6 x y 'ct mark set ip6 dscp | 0x4'
 ip6 x y
   [ payload load 2b @ network header + 0 => reg 1 ]
   [ bitwise reg 1 = ( reg 1 & 0x0000c00f ) ^ 0x00000000 ]
   [ bitwise reg 1 = ( reg 1 >> 0x00000006 ) ]
   [ byteorder reg 1 = ntoh(reg 1, 2, 1) ]
   [ bitwise reg 1 = ( reg 1 & 0xfffffffb ) ^ 0x00000004 ]
   [ ct set mark with reg 1 ]

works fine (without requiring this patch) because there is an explicit
byteorder expression.

However, ip dscp takes only 1-byte, so it does not require the byteorder
expression. Use host byteorder if the rhs of bitwise AND OR is larger
than lhs payload expression and such expression is equal or less than
1-byte.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>