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Message-ID: <20130813023558.GD27385@order.stressinduktion.org>
Date: Tue, 13 Aug 2013 04:35:58 +0200
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: netdev@...r.kernel.org
Cc: steffen.klassert@...unet.com
Subject: [PATCH net] xfrm: introduce helper for safe determination of mtu
skb->sk socket can be of AF_INET or AF_INET6 address family. Thus we
always have to make sure we a referring to the correct interpretation
of skb->sk.
We only depend on header defines to query the mtu, so we don't introduce
a new dependency to ipv6 by this change.
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
include/net/route.h | 8 ++++++++
include/net/xfrm.h | 12 ++++++++++++
net/ipv4/ip_output.c | 8 --------
net/ipv4/xfrm4_output.c | 4 +---
net/ipv6/xfrm6_output.c | 5 ++++-
5 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/include/net/route.h b/include/net/route.h
index 2ea40c1..afdeeb5 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -317,4 +317,12 @@ static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
return hoplimit;
}
+static inline int ip_skb_dst_mtu(struct sk_buff *skb)
+{
+ struct inet_sock *inet = skb->sk ? inet_sk(skb->sk) : NULL;
+
+ return (inet && inet->pmtudisc == IP_PMTUDISC_PROBE) ?
+ skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
+}
+
#endif /* _ROUTE_H */
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index e823786..b41d2d1 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -20,6 +20,7 @@
#include <net/route.h>
#include <net/ipv6.h>
#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
#include <net/flow.h>
#include <linux/interrupt.h>
@@ -1723,4 +1724,15 @@ static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
return ret;
}
+static inline int xfrm_skb_dst_mtu(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ if (sk && sk->sk_family == AF_INET6)
+ return ip6_skb_dst_mtu(skb);
+ else if (sk && sk->sk_family == AF_INET)
+ return ip_skb_dst_mtu(skb);
+ return dst_mtu(skb_dst(skb));
+}
+
#endif /* _NET_XFRM_H */
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 4bcabf3..9ee17e3 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -211,14 +211,6 @@ static inline int ip_finish_output2(struct sk_buff *skb)
return -EINVAL;
}
-static inline int ip_skb_dst_mtu(struct sk_buff *skb)
-{
- struct inet_sock *inet = skb->sk ? inet_sk(skb->sk) : NULL;
-
- return (inet && inet->pmtudisc == IP_PMTUDISC_PROBE) ?
- skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
-}
-
static int ip_finish_output(struct sk_buff *skb)
{
#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 7a5491f..80baf4a 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -21,7 +21,6 @@
static int xfrm4_tunnel_check_size(struct sk_buff *skb)
{
int mtu, ret = 0;
- struct dst_entry *dst;
if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
goto out;
@@ -29,8 +28,7 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
goto out;
- dst = skb_dst(skb);
- mtu = dst_mtu(dst);
+ mtu = xfrm_skb_dst_mtu(skb);
if (skb->len > mtu) {
if (skb->sk)
xfrm_local_error(skb, mtu);
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index b64fff3..3ac5ab2 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -138,7 +138,10 @@ static int __xfrm6_output(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
- int mtu = ip6_skb_dst_mtu(skb);
+ int mtu = xfrm_skb_dst_mtu(skb);
+
+ if (mtu < IPV6_MIN_MTU)
+ mtu = IPV6_MIN_MTU;
if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {
xfrm6_local_rxpmtu(skb, mtu);
--
1.8.3.1
--
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