linux-kernel - [PATCH V2] netfilter: nf_conntrack: table full detailed log

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Message-Id: <20250522091954.47067-1-xiafei_xupt@163.com>
Date: Thu, 22 May 2025 17:19:54 +0800
From: lvxiafei <xiafei_xupt@....com>
To: xiafei_xupt@....com
Cc: coreteam@...filter.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	horms@...nel.org,
	kadlec@...filter.org,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	lvxiafei@...setime.com,
	netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	pabeni@...hat.com,
	pablo@...filter.org
Subject: [PATCH V2] netfilter: nf_conntrack: table full detailed log

From: lvxiafei <lvxiafei@...setime.com>

Add the netns field in the "nf_conntrack: table full,
dropping packet" log to help locate the specific netns
when the table is full.

Signed-off-by: lvxiafei <lvxiafei@...setime.com>
---
 net/netfilter/nf_conntrack_core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 7f8b245e287a..47036a9d4acc 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1659,7 +1659,11 @@ __nf_conntrack_alloc(struct net *net,
 			if (!conntrack_gc_work.early_drop)
 				conntrack_gc_work.early_drop = true;
 			atomic_dec(&cnet->count);
-			net_warn_ratelimited("nf_conntrack: table full, dropping packet\n");
+			if (net == &init_net)
+				net_warn_ratelimited("nf_conntrack: table full, dropping packet\n");
+			else
+				net_warn_ratelimited("nf_conntrack: table full in netns %u, dropping packet\n",
+						     net->ns.inum);
 			return ERR_PTR(-ENOMEM);
 		}
 	}
-- 
2.40.1