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net: dropreason: add SKB_DROP_REASON_RECURSION_LIMIT 

ip[6]tunnel_xmit() can drop packets if a too deep recursion level
is detected.

Add SKB_DROP_REASON_RECURSION_LIMIT drop reason.

We will use this reason later in __dev_queue_xmit().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260312201824.203093-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
master
Eric Dumazet 2026-03-12 20:18:23 +00:00 committed by Jakub Kicinski
parent b58e3a2d01
commit d15d3de94a
3 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/dropreason-core.h
View File

@ -123,6 +123,7 @@
FN(PFMEMALLOC) \
FN(PSP_INPUT) \
FN(PSP_OUTPUT) \
FN(RECURSION_LIMIT) \
FNe(MAX)
/**
@ -582,6 +583,8 @@ enum skb_drop_reason {
SKB_DROP_REASON_PSP_INPUT,
/** @SKB_DROP_REASON_PSP_OUTPUT: PSP output checks failed */
SKB_DROP_REASON_PSP_OUTPUT,
/** @SKB_DROP_REASON_RECURSION_LIMIT: Dead loop on virtual device. */
SKB_DROP_REASON_RECURSION_LIMIT,
/**
* @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
* shouldn't be used as a real 'reason' - only for tracing code gen

2
include/net/ip6_tunnel.h
View File

@ -162,7 +162,7 @@ static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
dev->name);
DEV_STATS_INC(dev, tx_errors);
}
kfree_skb(skb);
kfree_skb_reason(skb, SKB_DROP_REASON_RECURSION_LIMIT);
return;
}

2
net/ipv4/ip_tunnel_core.c
View File

@ -65,7 +65,7 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
DEV_STATS_INC(dev, tx_errors);
}
ip_rt_put(rt);
kfree_skb(skb);
kfree_skb_reason(skb, SKB_DROP_REASON_RECURSION_LIMIT);
return;
}