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generated by cgit v1.2.3 (git 2.25.1) at 2025-12-06 10:07:06 +0000
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From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 16 Feb 2018 10:54:24 +0100
Subject: [PATCH] ipv6: make ip6_dst_mtu_forward inline

Removes a direct dependency on ipv6.ko

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -253,4 +253,26 @@ static inline bool rt6_duplicate_nexthop
 	       ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
 	       !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
 }
+
+static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
+{
+	unsigned int mtu;
+	struct inet6_dev *idev;
+
+	if (dst_metric_locked(dst, RTAX_MTU)) {
+		mtu = dst_metric_raw(dst, RTAX_MTU);
+		if (mtu)
+			return mtu;
+	}
+
+	mtu = IPV6_MIN_MTU;
+	rcu_read_lock();
+	idev = __in6_dev_get(dst->dev);
+	if (idev)
+		mtu = idev->cnf.mtu6;
+	rcu_read_unlock();
+
+	return mtu;
+}
+
 #endif
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -860,8 +860,6 @@ static inline struct sk_buff *ip6_finish
 			      &inet6_sk(sk)->cork);
 }
 
-unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst);
-
 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
 		   struct flowi6 *fl6);
 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -381,28 +381,6 @@ static inline int ip6_forward_finish(str
 	return dst_output(net, sk, skb);
 }
 
-unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
-{
-	unsigned int mtu;
-	struct inet6_dev *idev;
-
-	if (dst_metric_locked(dst, RTAX_MTU)) {
-		mtu = dst_metric_raw(dst, RTAX_MTU);
-		if (mtu)
-			return mtu;
-	}
-
-	mtu = IPV6_MIN_MTU;
-	rcu_read_lock();
-	idev = __in6_dev_get(dst->dev);
-	if (idev)
-		mtu = idev->cnf.mtu6;
-	rcu_read_unlock();
-
-	return mtu;
-}
-EXPORT_SYMBOL_GPL(ip6_dst_mtu_forward);
-
 static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
 {
 	if (skb->len <= mtu)