netdev - [PATCH net-next] ipvlan: Make skb->skb_iif track skb->dev for l3s mode

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Date:   Thu, 9 Mar 2023 10:03:36 +0800
From:   Jianguo Wu <wujianguo106@....com>
To:     netdev <netdev@...r.kernel.org>
Cc:     "edumazet@...gle.com >> Eric Dumazet" <edumazet@...gle.com>,
        davem@...emloft.net, daniel@...earbox.net,
        Florian Westphal <fw@...len.de>
Subject: [PATCH net-next] ipvlan: Make skb->skb_iif track skb->dev for l3s
 mode

From: Jianguo Wu <wujianguo@...natelecom.cn>

For l3s mode, skb->dev is set to ipvlan interface in ipvlan_nf_input():
  skb->dev = addr->master->dev
but, skb->skb_iif remain unchanged, this will cause socket lookup failed
if a target socket is bound to a interface, like the following example:

  ip link add ipvlan0 link eth0 type ipvlan mode l3s
  ip addr add dev ipvlan0 192.168.124.111/24
  ip link set ipvlan0 up

  ping -c 1 -I ipvlan0 8.8.8.8
  100% packet loss

This is because there is no match sk in __raw_v4_lookup() as sk->sk_bound_dev_if != dif(skb->skb_iif).
Fix this by make skb->skb_iif track skb->dev in ipvlan_nf_input().

Fixes: c675e06a98a4 ("ipvlan: decouple l3s mode dependencies from other modes").

Signed-off-by: Jianguo Wu <wujianguo@...natelecom.cn>
---
 drivers/net/ipvlan/ipvlan_l3s.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ipvlan/ipvlan_l3s.c b/drivers/net/ipvlan/ipvlan_l3s.c
index 943d26cbf39f..71712ea25403 100644
--- a/drivers/net/ipvlan/ipvlan_l3s.c
+++ b/drivers/net/ipvlan/ipvlan_l3s.c
@@ -101,6 +101,7 @@ static unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
 		goto out;

 	skb->dev = addr->master->dev;
+	skb->skb_iif = skb->dev->ifindex;
 	len = skb->len + ETH_HLEN;
 	ipvlan_count_rx(addr->master, len, true, false);
 out:
-- 
1.8.3.1