netdev - [PATCH net-next] seg6: Cleanup duplicates of skb_dst

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Message-Id: <20230515153427.3385392-1-yuya.tajimaa@gmail.com>
Date: Mon, 15 May 2023 15:34:27 +0000
From: Yuya Tajima <yuya.tajimaa@...il.com>
To: davem@...emloft.net,
	dsahern@...nel.org
Cc: netdev@...r.kernel.org,
	yuya.tajimaa@...il.com
Subject: [PATCH net-next] seg6: Cleanup duplicates of skb_dst_drop calls

In processing IPv6 segment routing header (SRH), several functions call
skb_dst_drop before ip6_route_input. However, ip6_route_input calls
skb_dst_drop within it, so there is no need to call skb_dst_drop in advance.

Signed-off-by: Yuya Tajima <yuya.tajimaa@...il.com>
---
 net/ipv6/exthdrs.c       | 3 ---
 net/ipv6/seg6_iptunnel.c | 3 +--
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index a8d961d3a477..04c14fc4b14d 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -458,8 +458,6 @@ static int ipv6_srh_rcv(struct sk_buff *skb)
 
 	ipv6_hdr(skb)->daddr = *addr;
 
-	skb_dst_drop(skb);
-
 	ip6_route_input(skb);
 
 	if (skb_dst(skb)->error) {
@@ -834,7 +832,6 @@ static int ipv6_rthdr_rcv(struct sk_buff *skb)
 	*addr = ipv6_hdr(skb)->daddr;
 	ipv6_hdr(skb)->daddr = daddr;
 
-	skb_dst_drop(skb);
 	ip6_route_input(skb);
 	if (skb_dst(skb)->error) {
 		skb_push(skb, skb->data - skb_network_header(skb));
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 34db881204d2..03b877ff4558 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -470,8 +470,6 @@ static int seg6_input_core(struct net *net, struct sock *sk,
 	dst = dst_cache_get(&slwt->cache);
 	preempt_enable();
 
-	skb_dst_drop(skb);
-
 	if (!dst) {
 		ip6_route_input(skb);
 		dst = skb_dst(skb);
@@ -482,6 +480,7 @@ static int seg6_input_core(struct net *net, struct sock *sk,
 			preempt_enable();
 		}
 	} else {
+		skb_dst_drop(skb);
 		skb_dst_set(skb, dst);
 	}
 
-- 
2.34.1