[NETFILTER]: nf_{conntrack,nat}_proto_udp{,lite}: annotate with const

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/nf_nat_proto_udp.c

@@ -91,7 +91,7 @@ udp_manip_pkt(struct sk_buff *skb,
 	      const struct nf_conntrack_tuple *tuple,
 	      enum nf_nat_manip_type maniptype)
 {
-	struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
+	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct udphdr *hdr;
 	unsigned int hdroff = iphdroff + iph->ihl*4;
 	__be32 oldip, newip;

net/netfilter/nf_conntrack_proto_udp.c

@@ -30,7 +30,8 @@ static int udp_pkt_to_tuple(const struct sk_buff *skb,
 			     unsigned int dataoff,
 			     struct nf_conntrack_tuple *tuple)
 {
-	struct udphdr _hdr, *hp;
+	const struct udphdr *hp;
+	struct udphdr _hdr;
 
 	/* Actually only need first 8 bytes. */
 	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
@@ -94,7 +95,8 @@ static int udp_error(struct sk_buff *skb, unsigned int dataoff,
 		     unsigned int hooknum)
 {
 	unsigned int udplen = skb->len - dataoff;
-	struct udphdr _hdr, *hdr;
+	const struct udphdr *hdr;
+	struct udphdr _hdr;
 
 	/* Header is too small? */
 	hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);

net/netfilter/nf_conntrack_proto_udplite.c

@@ -31,7 +31,8 @@ static int udplite_pkt_to_tuple(const struct sk_buff *skb,
 				unsigned int dataoff,
 				struct nf_conntrack_tuple *tuple)
 {
-	struct udphdr _hdr, *hp;
+	const struct udphdr *hp;
+	struct udphdr _hdr;
 
 	hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
 	if (hp == NULL)
@@ -94,7 +95,8 @@ static int udplite_error(struct sk_buff *skb, unsigned int dataoff,
 			 unsigned int hooknum)
 {
 	unsigned int udplen = skb->len - dataoff;
-	struct udphdr _hdr, *hdr;
+	const struct udphdr *hdr;
+	struct udphdr _hdr;
 	unsigned int cscov;
 
 	/* Header is too small? */