netdev - [PATCH net-next] bpf: Remove duplicate tcp

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Date:   Fri,  9 Jun 2017 12:17:37 -0700
From:   Chenbo Feng <chenbofeng.kernel@...il.com>
To:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Cc:     Lorenzo Colitti <lorenzo@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: [PATCH net-next] bpf: Remove duplicate tcp_filter hook in ipv6

From: Chenbo Feng <fengc@...gle.com>

There are two tcp_filter hooks in tcp_ipv6 ingress path currently.
One is at tcp_v6_rcv and another is in tcp_v6_do_rcv. It seems the
tcp_filter() call inside tcp_v6_do_rcv is redundent and some packet
will be filtered twice in this situation. This will cause trouble
when using eBPF filters to account traffic data.

Signed-off-by: Chenbo Feng <fengc@...gle.com>
Acked-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv6/tcp_ipv6.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 0840543..84ad502 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1249,9 +1249,6 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 	if (skb->protocol == htons(ETH_P_IP))
 		return tcp_v4_do_rcv(sk, skb);
 
-	if (tcp_filter(sk, skb))
-		goto discard;
-
 	/*
 	 *	socket locking is here for SMP purposes as backlog rcv
 	 *	is currently called with bh processing disabled.
-- 
2.7.4