netdev - [PATCH net 1/3] ip_tunnel: allow not to count pkts on tstats by setting skb's dev to NULL

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Message-Id: <89113721df2e1ea6f2ea9ecffe4024588f224dc3.1560778340.git.lucien.xin@gmail.com>
Date:   Mon, 17 Jun 2019 21:34:13 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>,
        tipc-discussion@...ts.sourceforge.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Su Yanjun <suyj.fnst@...fujitsu.com>,
        David Ahern <dsahern@...il.com>,
        syzkaller-bugs@...glegroups.com,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net 1/3] ip_tunnel: allow not to count pkts on tstats by setting skb's dev to NULL

iptunnel_xmit() works as a common function, also used by a udp tunnel
which doesn't have to have a tunnel device, like how TIPC works with
udp media.

In these cases, we should allow not to count pkts on dev's tstats, so
that udp tunnel can work with no tunnel device safely.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/ipv4/ip_tunnel_core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 30c1c26..5073e3c 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -89,9 +89,12 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
 
 	err = ip_local_out(net, sk, skb);
-	if (unlikely(net_xmit_eval(err)))
-		pkt_len = 0;
-	iptunnel_xmit_stats(dev, pkt_len);
+
+	if (dev) {
+		if (unlikely(net_xmit_eval(err)))
+			pkt_len = 0;
+		iptunnel_xmit_stats(dev, pkt_len);
+	}
 }
 EXPORT_SYMBOL_GPL(iptunnel_xmit);
 
-- 
2.1.0