[PATCH V2 2/2] ipvs: Extend MTU check to account for IPv6 NAT defrag changes
From: Jesper Dangaard Brouer <hidden>
Date: 2012-08-28 14:23:33
Also in:
lvs-devel, netfilter-devel
Subsystem:
ipvs, netfilter, networking [general], the rest · Maintainers:
Simon Horman, Julian Anastasov, Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
This patch is necessary, to make IPVS work, after Patrick McHardys IPv6 NAT defragmentation changes. Signed-off-by: Jesper Dangaard Brouer <redacted> --- In V2: the tunnel mode is no longer a special case. net/netfilter/ipvs/ip_vs_xmit.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 67a3978..56f6d5d 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c@@ -88,7 +88,14 @@ __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos) static inline bool __mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu) { - if (skb->len > mtu && !skb_is_gso(skb)) { + if (IP6CB(skb)->frag_max_size) { + /* frag_max_size tell us that, this packet have been + * defragmented by netfilter IPv6 conntrack module. + */ + if (IP6CB(skb)->frag_max_size > mtu) + return true; /* largest fragment violate MTU */ + } + else if (skb->len > mtu && !skb_is_gso(skb)) { return true; /* Packet size violate MTU size */ } return false;