netdev - [PATCH 22/30] ipv6: make ip6_dst_mtu

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Message-Id: <20180312175920.9022-23-pablo@netfilter.org>
Date:   Mon, 12 Mar 2018 18:59:12 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 22/30] ipv6: make ip6_dst_mtu_forward inline

From: Felix Fietkau <nbd@....name>

Needed to remove a direct dependency on ipv6.ko from flowtable
infrastructure. Make it inline like ip_dst_mtu_maybe_forward().

Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/net/ip6_route.h | 21 +++++++++++++++++++++
 include/net/ipv6.h      |  2 --
 net/ipv6/ip6_output.c   | 22 ----------------------
 3 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index ce2abc0ff102..18ef8c9890e2 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -271,4 +271,25 @@ static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
 	       !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
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index cabd3cdd4015..a4089cebe8d3 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -970,8 +970,6 @@ static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
 			      &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,
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a6eb0e699b15..2f1de4e8132a 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -378,28 +378,6 @@ static inline int ip6_forward_finish(struct net *net, struct sock *sk,
 	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)
-- 
2.11.0