netdev - [net-next fragmenation icmp 2/2] bridge: do not send icmp on fragmentation or defragmentation error

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Date:	Tue,  5 May 2015 18:59:54 -0700
From:	Andy Zhou <azhou@...ira.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Andy Zhou <azhou@...ira.com>
Subject: [net-next fragmenation icmp 2/2] bridge: do not send icmp on fragmentation or defragmentation error

Set IPSKB_NO_FRAG_ICMP bit when doing IP fragmentation and
defragmentation in bridging mode.

Signed-off-by: Andy Zhou <azhou@...ira.com>
---
 net/bridge/br_netfilter.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index ab55e24..3f3366a 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -663,6 +663,10 @@ static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops,
 	if (br_parse_ip_options(skb))
 		return NF_DROP;
 
+	/* In case this is a fragmented packet, do not send icmp packet on
+	 * defragmentation error  */
+	IPCB(skb)->flags |= IPSKB_NO_FRAG_ICMP;
+
 	nf_bridge_put(skb->nf_bridge);
 	if (!nf_bridge_alloc(skb))
 		return NF_DROP;
@@ -875,6 +879,9 @@ static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
 		skb_copy_from_linear_data_offset(skb, -data->size, data->mac,
 						 data->size);
 
+		/* Do not send ICMP packet on fragmentation error */
+		IPCB(skb)->flags |= IPSKB_NO_FRAG_ICMP;
+
 		ret = ip_fragment(sk, skb, br_nf_push_frag_xmit);
 	} else {
 		ret = br_dev_queue_push_xmit(sk, skb);
-- 
1.9.1

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