[PATCH v1 net-next] fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err().

[PATCH v1 net-next] fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err().

[Kuniyuki Iwashima]

UDP-Lite has been removed, and its error handler is no
longer found in either inet_protos[IPPROTO_UDPLITE] or
inet6_protos[IPPROTO_UDPLITE].

The recursion fixed by the protocol check in gue_err()
and gue6_err() no longer occurs with UDP-Lite.

Let's remove the checks.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 net/ipv4/fou_core.c | 3 +--
 net/ipv6/fou6.c     | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/fou_core.c b/net/ipv4/fou_core.c
index 3baaa4df7e42..5bae3cf7fe76 100644
--- a/net/ipv4/fou_core.c
+++ b/net/ipv4/fou_core.c
@@ -1150,8 +1150,7 @@ static int gue_err(struct sk_buff *skb, u32 info)
 	 * recursion. Besides, this kind of encapsulation can't even be
 	 * configured currently. Discard this.
 	 */
-	if (guehdr->proto_ctype == IPPROTO_UDP ||
-	    guehdr->proto_ctype == IPPROTO_UDPLITE)
+	if (guehdr->proto_ctype == IPPROTO_UDP)
 		return -EOPNOTSUPP;
 
 	skb_set_transport_header(skb, -(int)sizeof(struct icmphdr));
diff --git a/net/ipv6/fou6.c b/net/ipv6/fou6.c
index 430518ae26fa..157765259e2f 100644
--- a/net/ipv6/fou6.c
+++ b/net/ipv6/fou6.c
@@ -141,8 +141,7 @@ static int gue6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	 * recursion. Besides, this kind of encapsulation can't even be
 	 * configured currently. Discard this.
 	 */
-	if (guehdr->proto_ctype == IPPROTO_UDP ||
-	    guehdr->proto_ctype == IPPROTO_UDPLITE)
+	if (guehdr->proto_ctype == IPPROTO_UDP)
 		return -EOPNOTSUPP;
 
 	skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr));
-- 
2.53.0.851.ga537e3e6e9-goog

Re: [PATCH v1 net-next] fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err().

[Joe Damato]

On Mon, Mar 16, 2026 at 01:31:25PM +0000, Kuniyuki Iwashima wrote:
> UDP-Lite has been removed, and its error handler is no
> longer found in either inet_protos[IPPROTO_UDPLITE] or
> inet6_protos[IPPROTO_UDPLITE].
> 
> The recursion fixed by the protocol check in gue_err()
> and gue6_err() no longer occurs with UDP-Lite.
> 
> Let's remove the checks.
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
> ---
>  net/ipv4/fou_core.c | 3 +--
>  net/ipv6/fou6.c     | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)

Reviewed-by: Joe Damato <joe@dama.to>

Re: [PATCH v1 net-next] fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err().

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 16 Mar 2026 13:31:25 +0000 you wrote:
> UDP-Lite has been removed, and its error handler is no
> longer found in either inet_protos[IPPROTO_UDPLITE] or
> inet6_protos[IPPROTO_UDPLITE].
> 
> The recursion fixed by the protocol check in gue_err()
> and gue6_err() no longer occurs with UDP-Lite.
> 
> [...]

Here is the summary with links:
  - [v1,net-next] fou: Remove IPPROTO_UDPLITE check in gue_err() and gue6_err().
    https://git.kernel.org/netdev/net-next/c/e3f741f587a9

You are awesome, thank you!
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