linux-kernel - [PATCH v4 1/6] udp: allow header check for dodgy GSO_UDP

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Message-Id: <20221201223332.249441-1-andrew@daynix.com>
Date:   Fri,  2 Dec 2022 00:33:27 +0200
From:   Andrew Melnychenko <andrew@...nix.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mst@...hat.com, jasowang@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     devel@...nix.com
Subject: [PATCH v4 1/6] udp: allow header check for dodgy GSO_UDP_L4 packets.

Allow UDP_L4 for robust packets.

Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
---
 net/ipv4/udp_offload.c | 3 ++-
 net/ipv6/udp_offload.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 6d1a4bec2614..f65b1a7a0c26 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -387,7 +387,8 @@ 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;
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 7720d04ed396..057293293e30 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -42,7 +42,8 @@ static struct sk_buff *udp6_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, true);
 
 		mss = skb_shinfo(skb)->gso_size;
-- 
2.38.1