ipv4: fix path MTU discovery with connection tracking

IPv4 conntrack defragments incoming packet at the PRE_ROUTING hook and
(in case of forwarded packets) refragments them at POST_ROUTING
independent of the IP_DF flag. Refragmentation uses the dst_mtu() of
the local route without caring about the original fragment sizes,
thereby breaking PMTUD.

This patch fixes this by keeping track of the largest received fragment
with IP_DF set and generates an ICMP fragmentation required error during
refragmentation if that size exceeds the MTU.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 2431cf83aeca..5098ee7b7e0e 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -29,6 +29,8 @@ struct inet_frag_queue {
 #define INET_FRAG_COMPLETE      4
 #define INET_FRAG_FIRST_IN      2
 #define INET_FRAG_LAST_IN       1
+
+        u16                     max_size;
 };
 
 #define INETFRAGS_HASHSZ                64
diff --git a/include/net/ip.h b/include/net/ip.h
index 5a5d84d3d2c6..0707fb9551aa 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -42,6 +42,8 @@ struct inet_skb_parm {
 #define IPSKB_XFRM_TRANSFORMED  4
 #define IPSKB_FRAG_COMPLETE     8
 #define IPSKB_REROUTED          16
+
+        u16                     frag_max_size;
 };
 
 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)