netdev - [PATCH v3 1/6] udp: allow header check for dodgy GSO_UDP

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Date:   Wed,  7 Sep 2022 15:50:43 +0300
From:   Andrew Melnychenko <andrew@...nix.com>
To:     edumazet@...gle.com, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jasowang@...hat.com, mst@...hat.com, pabeni@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org
Cc:     yan@...nix.com, yuri.benditovich@...nix.com
Subject: [PATCH v3 1/6] udp: allow header check for dodgy GSO_UDP_L4 packets.

Packets from TAP devices with USO offload converts
to GSO_UDP_L4 & GSO_DODGY sk buffers.
Added changes allow skipping segmentation for DODGY/ROBUST packets.

Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
---
 net/ipv4/udp_offload.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6d1a4bec2614..8e002419b4d5 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -387,7 +387,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 		goto out;
 
-	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
+	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST))
 		return __udp_gso_segment(skb, features, false);
 
 	mss = skb_shinfo(skb)->gso_size;
-- 
2.37.2