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| author | Chris J Arges <carges@cloudflare.com> | 2026-04-02 17:23:16 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-04-03 15:52:10 -0700 |
| commit | 77facb35227c421467cdb49268de433168c2dcef (patch) | |
| tree | b9eccce49dbab4d744c485048ad845fb108addf8 /include/net | |
| parent | fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 (diff) | |
| download | lwn-77facb35227c421467cdb49268de433168c2dcef.tar.gz lwn-77facb35227c421467cdb49268de433168c2dcef.zip | |
net: increase IP_TUNNEL_RECURSION_LIMIT to 5
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: 6f1a9140ecda ("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>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/ip_tunnels.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 1f577a4f8ce9..d708b66e55cd 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -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) |