4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Ahern <dsahern@xxxxxxxxx>
[ Usptream commit b4d1605a8ea608fd7dc45b926a05d75d340bde4b ]
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 <dsahern@xxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/net/tcp.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -874,12 +874,11 @@ static inline int tcp_v6_sdif(const stru
}
#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;