netfilter: x_tables: reduce xt_action_param by 8 byte

The fragment offset in ipv4/ipv6 is a 16bit field, so use
u16 instead of unsigned int.

On 64bit: 40 bytes to 32 bytes. By extension this also reduces
nft_pktinfo (56 to 48 byte).
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/linux/netfilter/x_tables.h

@@ -36,8 +36,8 @@ struct xt_action_param {
 		const void *matchinfo, *targinfo;
 	};
 	const struct nf_hook_state *state;
-	int fragoff;
 	unsigned int thoff;
+	u16 fragoff;
 	bool hotdrop;
 };
 

net/ipv6/netfilter/ip6_tables.c

@@ -51,7 +51,7 @@ ip6_packet_match(const struct sk_buff *skb,
 		 const char *outdev,
 		 const struct ip6t_ip6 *ip6info,
 		 unsigned int *protoff,
-		 int *fragoff, bool *hotdrop)
+		 u16 *fragoff, bool *hotdrop)
 {
 	unsigned long ret;
 	const struct ipv6hdr *ipv6 = ipv6_hdr(skb);