[PATCH net 2/2] tcp: use IPCB instead of TCP_SKB_CB in inet_exact_dif_match()

[Eric Dumazet]

From: David Ahern <dsah...@gmail.com>

After this fix : ("tcp: add tcp_v4_fill_cb()/tcp_v4_restore_cb()"),
socket lookups happen while skb->cb[] has not been mangled yet by TCP.

Fixes: a04a480d4392 ("net: Require exact match for TCP socket lookups if dif is 
l3mdev")
Signed-off-by: David Ahern <dsah...@gmail.com>
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 include/net/tcp.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 
4e09398009c10a72478b43d3cffc24ba01612b91..6998707e81f343ef8d893c0b2ba16db541082230
 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -844,12 +844,11 @@ static inline int tcp_v6_sdif(const struct sk_buff *skb)
 }
 #endif
 
-/* TCP_SKB_CB reference means this can not be used from early demux */
 static inline bool inet_exact_dif_match(struct net *net, struct sk_buff *skb)
 {
 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
        if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
-           skb && ipv4_l3mdev_skb(TCP_SKB_CB(skb)->header.h4.flags))
+           skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
                return true;
 #endif
        return false;
-- 
2.15.0.531.g2ccb3012c9-goog