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net: increase IP_TUNNEL_RECURSION_LIMIT to 5

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In configurations with multiple tunnel layers and MPLS lwtunnel routing, a
single tunnel hop can increment the counter beyond this limit. This causes
packets to be dropped with the "Dead loop on virtual device" message even
when a routing loop doesn't exist.

Increase IP_TUNNEL_RECURSION_LIMIT from 4 to 5 to handle this use-case.

Fixes: 6f1a9140ec ("net: add xmit recursion limit to tunnel xmit functions")
Link: https://lore.kernel.org/netdev/88deb91b-ef1b-403c-8eeb-0f971f27e34f@redhat.com/
Signed-off-by: Chris J Arges <carges@cloudflare.com>
Link: https://patch.msgid.link/20260402222401.3408368-1-carges@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Chris J Arges
2026-04-02 17:23:16 -05:00
committed by Jakub Kicinski
parent fde29fd934
commit 77facb3522
1 changed files with 1 additions and 1 deletions
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2
include/net/ip_tunnels.h
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@@ -32,7 +32,7 @@
* recursion involves route lookups and full IP output, consuming much
* more stack per level, so a lower limit is needed.
*/
#define IP_TUNNEL_RECURSION_LIMIT 4
#define IP_TUNNEL_RECURSION_LIMIT 5
/* Keep error state on tunnel for 30 sec */
#define IPTUNNEL_ERR_TIMEO (30*HZ)