netfilter: nat: remove nf_nat_l4proto.h

after ipv4/6 nat tracker merge, there are no external callers, so
make last function static and remove the header.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_nat_l4proto.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/* Header for use in defining a given protocol. */
-#ifndef _NF_NAT_L4PROTO_H
-#define _NF_NAT_L4PROTO_H
-#include <net/netfilter/nf_nat.h>
-#include <linux/netfilter/nfnetlink_conntrack.h>
-
-struct nf_nat_l3proto;
-
-/* Translate a packet to the target according to manip type.  Return on success. */
-bool nf_nat_l4proto_manip_pkt(struct sk_buff *skb,
-			      const struct nf_nat_l3proto *l3proto,
-			      unsigned int iphdroff, unsigned int hdroff,
-			      const struct nf_conntrack_tuple *tuple,
-			      enum nf_nat_manip_type maniptype);
-#endif /*_NF_NAT_L4PROTO_H*/

net/netfilter/nf_nat_helper.c

@@ -23,7 +23,6 @@
 #include <net/netfilter/nf_conntrack_seqadj.h>
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_l3proto.h>
-#include <net/netfilter/nf_nat_l4proto.h>
 #include <net/netfilter/nf_nat_core.h>
 #include <net/netfilter/nf_nat_helper.h>
 

net/netfilter/nf_nat_proto.c

@@ -22,7 +22,6 @@
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_core.h>
 #include <net/netfilter/nf_nat_l3proto.h>
-#include <net/netfilter/nf_nat_l4proto.h>
 
 #include <linux/ipv6.h>
 #include <linux/netfilter_ipv6.h>
@@ -34,6 +33,7 @@
 
 #include <net/netfilter/nf_conntrack_core.h>
 #include <net/netfilter/nf_conntrack.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
 
 static const struct nf_nat_l3proto nf_nat_l3proto_ipv4;
 #if IS_ENABLED(CONFIG_IPV6)
@@ -320,7 +320,7 @@ gre_manip_pkt(struct sk_buff *skb,
 	return true;
 }
 
-bool nf_nat_l4proto_manip_pkt(struct sk_buff *skb,
+static bool l4proto_manip_pkt(struct sk_buff *skb,
 			      const struct nf_nat_l3proto *l3proto,
 			      unsigned int iphdroff, unsigned int hdroff,
 			      const struct nf_conntrack_tuple *tuple,
@@ -356,7 +356,6 @@ bool nf_nat_l4proto_manip_pkt(struct sk_buff *skb,
 	/* If we don't know protocol -- no error, pass it unmodified. */
 	return true;
 }
-EXPORT_SYMBOL_GPL(nf_nat_l4proto_manip_pkt);
 
 static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
 				  unsigned int iphdroff,
@@ -372,7 +371,7 @@ static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
 	iph = (void *)skb->data + iphdroff;
 	hdroff = iphdroff + iph->ihl * 4;
 
-	if (!nf_nat_l4proto_manip_pkt(skb, &nf_nat_l3proto_ipv4, iphdroff,
+	if (!l4proto_manip_pkt(skb, &nf_nat_l3proto_ipv4, iphdroff,
 			       hdroff, target, maniptype))
 		return false;
 	iph = (void *)skb->data + iphdroff;
@@ -409,7 +408,7 @@ static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb,
 		goto manip_addr;
 
 	if ((frag_off & htons(~0x7)) == 0 &&
-	    !nf_nat_l4proto_manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff,
+	    !l4proto_manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff,
 			       target, maniptype))
 		return false;
 
@@ -758,8 +757,6 @@ void nf_nat_l3proto_exit(void)
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
-static const struct nf_nat_l3proto nf_nat_l3proto_ipv6;
-
 static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = {
 	.l3proto		= NFPROTO_IPV6,
 	.manip_pkt		= nf_nat_ipv6_manip_pkt,