netdev - [PATCH net] esp: skip GRO for fragmented packets

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Date:   Thu, 27 Apr 2017 12:31:14 +0200
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Sabrina Dubroca <sd@...asysnail.net>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH net] esp: skip GRO for fragmented packets

Currently, ESP4 GRO doesn't work for fragmented packets, so let's send
these through the normal path.

Fixes: 7785bba299a8 ("esp: Add a software GRO codepath")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
Steffen, if you prefer to drop this patch and fix this properly,
that's okay for me. I can't look much deeper into this right now and
it's broken on current net/master.

It seems like the first fragment gets dropped, at least I don't see it
on tcpdump on the RX machine.

 net/ipv4/esp4_offload.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index 1de442632406..ab5faca28e19 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -38,6 +38,9 @@ static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
 	__be32 spi;
 	int err;
 
+	if (ip_is_fragment(ip_hdr(skb)))
+		goto flush;
+
 	skb_pull(skb, offset);
 
 	if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
@@ -78,6 +81,7 @@ static struct sk_buff **esp4_gro_receive(struct sk_buff **head,
 	return ERR_PTR(-EINPROGRESS);
 out:
 	skb_push(skb, offset);
+flush:
 	NAPI_GRO_CB(skb)->same_flow = 0;
 	NAPI_GRO_CB(skb)->flush = 1;
 
-- 
2.12.2