netfilter: fix sparse warnings in reject handling

make C=1 CF=-D__CHECK_ENDIAN__ shows following:

net/bridge/netfilter/nft_reject_bridge.c:65:50: warning: incorrect type in argument 3 (different base types)
net/bridge/netfilter/nft_reject_bridge.c:65:50:    expected restricted __be16 [usertype] protocol [..]
net/bridge/netfilter/nft_reject_bridge.c:102:37: warning: cast from restricted __be16
net/bridge/netfilter/nft_reject_bridge.c:102:37: warning: incorrect type in argument 1 (different base types) [..]
net/bridge/netfilter/nft_reject_bridge.c:121:50: warning: incorrect type in argument 3 (different base types) [..]
net/bridge/netfilter/nft_reject_bridge.c:168:52: warning: incorrect type in argument 3 (different base types) [..]
net/bridge/netfilter/nft_reject_bridge.c:233:52: warning: incorrect type in argument 3 (different base types) [..]

Caused by two (harmless) errors:
1. htons() instead of ntohs()
2. __be16 for protocol in nf_reject_ipXhdr_put API, use u8 instead.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/ipv4/nf_reject.h

@@ -12,7 +12,7 @@ const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
 					     struct tcphdr *_oth, int hook);
 struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
 				  const struct sk_buff *oldskb,
-				  __be16 protocol, int ttl);
+				  __u8 protocol, int ttl);
 void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
 			     const struct tcphdr *oth);
 

include/net/netfilter/ipv6/nf_reject.h

@@ -13,7 +13,7 @@ const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
 					      unsigned int *otcplen, int hook);
 struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
 				     const struct sk_buff *oldskb,
-				     __be16 protocol, int hoplimit);
+				     __u8 protocol, int hoplimit);
 void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
 			      const struct sk_buff *oldskb,
 			      const struct tcphdr *oth, unsigned int otcplen);

net/bridge/netfilter/nft_reject_bridge.c

@@ -99,7 +99,7 @@ static void nft_reject_br_send_v4_unreach(struct sk_buff *oldskb,
 	if (!pskb_may_pull(oldskb, len))
 		return;
 
-	if (pskb_trim_rcsum(oldskb, htons(ip_hdr(oldskb)->tot_len)))
+	if (pskb_trim_rcsum(oldskb, ntohs(ip_hdr(oldskb)->tot_len)))
 		return;
 
 	if (ip_hdr(oldskb)->protocol == IPPROTO_TCP ||

net/ipv4/netfilter/nf_reject_ipv4.c

@@ -43,7 +43,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_get);
 
 struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
 				  const struct sk_buff *oldskb,
-				  __be16 protocol, int ttl)
+				  __u8 protocol, int ttl)
 {
 	struct iphdr *niph, *oiph = ip_hdr(oldskb);
 

net/ipv6/netfilter/nf_reject_ipv6.c

@@ -65,7 +65,7 @@ EXPORT_SYMBOL_GPL(nf_reject_ip6_tcphdr_get);
 
 struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
 				     const struct sk_buff *oldskb,
-				     __be16 protocol, int hoplimit)
+				     __u8 protocol, int hoplimit)
 {
 	struct ipv6hdr *ip6h;
 	const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);