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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: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-11-23 02:13:31 +00:00 committed by David S. Miller
parent ebb762f27f
commit 618f9bc74a
5 changed files with 25 additions and 12 deletions
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7
include/net/dst.h
View File

@ -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 */

4
net/decnet/dn_route.c
View File

@ -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)

11
net/ipv4/route.c
View File

@ -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)

11
net/ipv6/route.c
View File

@ -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);

4
net/xfrm/xfrm_policy.c
View File

@ -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)