Commit 618f9bc7 authored by Steffen Klassert's avatar Steffen Klassert Committed by David S. Miller
Browse files

net: Move mtu handling down to the protocol depended handlers 



We move all mtu handling from dst_mtu() down to the protocol
layer. So each protocol can implement the mtu handling in
a different manner.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ebb762f2

include/net/dst.h

+1 −6
Original line number Diff line number Diff line
@@ -205,12 +205,7 @@ dst_feature(const struct dst_entry *dst, u32 feature) 


static inline u32 dst_mtu(const struct dst_entry *dst)

{

	u32 mtu = dst_metric_raw(dst, RTAX_MTU);



	if (!mtu)

		mtu = dst->ops->mtu(dst);



	return mtu;

	return dst->ops->mtu(dst);

}



/* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */

net/decnet/dn_route.c

+3 −1
Original line number Diff line number Diff line
@@ -827,7 +827,9 @@ static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) 


static unsigned int dn_dst_mtu(const struct dst_entry *dst)

{

	return dst->dev->mtu;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	return mtu ? : dst->dev->mtu;

}



static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)

net/ipv4/route.c

+9 −2
Original line number Diff line number Diff line
@@ -1816,7 +1816,12 @@ static unsigned int ipv4_default_advmss(const struct dst_entry *dst) 


static unsigned int ipv4_mtu(const struct dst_entry *dst)

{

	unsigned int mtu = dst->dev->mtu;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	if (mtu)

		return mtu;



	mtu = dst->dev->mtu;



	if (unlikely(dst_metric_locked(dst, RTAX_MTU))) {

		const struct rtable *rt = (const struct rtable *) dst;
@@ -2757,7 +2762,9 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo 


static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst)

{

	return dst->dev->mtu;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	return mtu ? : dst->dev->mtu;

}



static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)

net/ipv6/route.c

+9 −2
Original line number Diff line number Diff line
@@ -157,7 +157,9 @@ static struct dst_ops ip6_dst_ops_template = { 


static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)

{

	return dst->dev->mtu;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	return mtu ? : dst->dev->mtu;

}



static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
@@ -1043,8 +1045,13 @@ static unsigned int ip6_default_advmss(const struct dst_entry *dst) 


static unsigned int ip6_mtu(const struct dst_entry *dst)

{

	unsigned int mtu = IPV6_MIN_MTU;

	struct inet6_dev *idev;

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	if (mtu)

		return mtu;



	mtu = IPV6_MIN_MTU;



	rcu_read_lock();

	idev = __in6_dev_get(dst->dev);

net/xfrm/xfrm_policy.c

+3 −1
Original line number Diff line number Diff line
@@ -2384,7 +2384,9 @@ static unsigned int xfrm_default_advmss(const struct dst_entry *dst) 


static unsigned int xfrm_mtu(const struct dst_entry *dst)

{

	return dst_mtu(dst->path);

	unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);



	return mtu ? : dst_mtu(dst->path);

}



static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, const void *daddr)