esp: Add a software GRO codepath
This patch adds GRO ifrastructure and callbacks for ESP on
ipv4 and ipv6.
In case the GRO layer detects an ESP packet, the
esp{4,6}_gro_receive() function does a xfrm state lookup
and calls the xfrm input layer if it finds a matching state.
The packet will be decapsulated and reinjected it into layer 2.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 10086a0..14d82bf 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -682,6 +682,7 @@
unsigned int daddroff;
unsigned int family;
+ __be32 seq;
};
#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))