linux-kernel - [PATCH net-next 1/6] net: netfilter: use kfree_drop_reason() for NF

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Date:   Mon, 24 Jan 2022 21:15:33 +0800
From:   menglong8.dong@...il.com
To:     kuba@...nel.org
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, pablo@...filter.org,
        kadlec@...filter.org, fw@...len.de, imagedong@...cent.com,
        edumazet@...gle.com, alobakin@...me, paulb@...dia.com,
        pabeni@...hat.com, talalahmad@...gle.com, haokexin@...il.com,
        keescook@...omium.org, memxor@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        cong.wang@...edance.com
Subject: [PATCH net-next 1/6] net: netfilter: use kfree_drop_reason() for NF_DROP

From: Menglong Dong <imagedong@...cent.com>

Replace kfree_skb() with kfree_skb_reason() in nf_hook_slow() when
skb is dropped by reason of NF_DROP.

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 include/linux/skbuff.h     | 1 +
 include/trace/events/skb.h | 1 +
 net/netfilter/core.c       | 3 ++-
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index bf11e1fbd69b..1bcd690b8ae1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -320,6 +320,7 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_TCP_CSUM,
 	SKB_DROP_REASON_TCP_FILTER,
 	SKB_DROP_REASON_UDP_CSUM,
+	SKB_DROP_REASON_NETFILTER_DROP,
 	SKB_DROP_REASON_MAX,
 };
 
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 3e042ca2cedb..beed7bb2bc0e 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -16,6 +16,7 @@
 	EM(SKB_DROP_REASON_TCP_CSUM, TCP_CSUM)			\
 	EM(SKB_DROP_REASON_TCP_FILTER, TCP_FILTER)		\
 	EM(SKB_DROP_REASON_UDP_CSUM, UDP_CSUM)			\
+	EM(SKB_DROP_REASON_NETFILTER_DROP, NETFILTER_DROP)	\
 	EMe(SKB_DROP_REASON_MAX, MAX)
 
 #undef EM
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 354cb472f386..d1c9dfbb11fa 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -621,7 +621,8 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
 		case NF_ACCEPT:
 			break;
 		case NF_DROP:
-			kfree_skb(skb);
+			kfree_skb_reason(skb,
+					 SKB_DROP_REASON_NETFILTER_DROP);
 			ret = NF_DROP_GETERR(verdict);
 			if (ret == 0)
 				ret = -EPERM;
-- 
2.34.1