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Message-ID: <20111123121213.GA6348@secunet.com>
Date: Wed, 23 Nov 2011 13:12:13 +0100
From: Steffen Klassert <steffen.klassert@...unet.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH 1/5] route: Use the device mtu as the default for blackhole
routes
As it is, we return null as the default mtu of blackhole routes.
This may lead to a propagation of a bogus pmtu if the default_mtu
method of a blackhole route is invoked. So return dst->dev->mtu
as the default mtu instead.
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
net/ipv4/route.c | 2 +-
net/ipv6/route.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 0c74da8..5b17bf1 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2757,7 +2757,7 @@ static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 coo
static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst)
{
- return 0;
+ return dst->dev->mtu;
}
static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8473016..d8fbd18 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -157,7 +157,7 @@ static struct dst_ops ip6_dst_ops_template = {
static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
{
- return 0;
+ return dst->dev->mtu;
}
static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
--
1.7.0.4
--
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