linux-kernel - [PATCH v3 net-next 6/7] net: udp: use kfree_skb_reason() in udp_queue_rcv_one

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Message-Id: <20220128073319.1017084-7-imagedong@tencent.com>
Date:   Fri, 28 Jan 2022 15:33:18 +0800
From:   menglong8.dong@...il.com
To:     dsahern@...nel.org, kuba@...nel.org
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        yoshfuji@...ux-ipv6.org, pablo@...filter.org, kadlec@...filter.org,
        fw@...len.de, imagedong@...cent.com, edumazet@...gle.com,
        alobakin@...me, paulb@...dia.com, keescook@...omium.org,
        talalahmad@...gle.com, haokexin@...il.com, memxor@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        cong.wang@...edance.com, mengensun@...cent.com
Subject: [PATCH v3 net-next 6/7] net: udp: use kfree_skb_reason() in udp_queue_rcv_one_skb()

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

Replace kfree_skb() with kfree_skb_reason() in udp_queue_rcv_one_skb().

Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
v2:
- use SKB_DROP_REASON_SOCKET_FILTER instead of
  SKB_DROP_REASON_UDP_FILTER
---
 net/ipv4/udp.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 464590ea922e..9e28e76e95b8 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2120,14 +2120,17 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
  */
 static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
 {
+	int drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
 	struct udp_sock *up = udp_sk(sk);
 	int is_udplite = IS_UDPLITE(sk);
 
 	/*
 	 *	Charge it to the socket, dropping if the queue is full.
 	 */
-	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
+	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
+		drop_reason = SKB_DROP_REASON_XFRM_POLICY;
 		goto drop;
+	}
 	nf_reset_ct(skb);
 
 	if (static_branch_unlikely(&udp_encap_needed_key) && up->encap_type) {
@@ -2204,8 +2207,10 @@ static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
 	    udp_lib_checksum_complete(skb))
 			goto csum_error;
 
-	if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
+	if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) {
+		drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
 		goto drop;
+	}
 
 	udp_csum_pull_header(skb);
 
@@ -2213,11 +2218,12 @@ static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
 	return __udp_queue_rcv_skb(sk, skb);
 
 csum_error:
+	drop_reason = SKB_DROP_REASON_UDP_CSUM;
 	__UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
 drop:
 	__UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
 	atomic_inc(&sk->sk_drops);
-	kfree_skb(skb);
+	kfree_skb_reason(skb, drop_reason);
 	return -1;
 }
 
-- 
2.34.1