Commit 48e4704a authored by Jason Xing's avatar Jason Xing Committed by David S. Miller
Browse files

tcp: add a dropreason definitions and prepare for cookie check 



Adding one drop reason to detect the condition of skb dropped
because of hook points in cookie check and extending NO_SOCKET
to consider another two cases can be used later.

Signed-off-by: default avatarJason Xing <kernelxing@tencent.com>
Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarDavid Ahern <dsahern@kernel.org>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 12a686c2

include/net/dropreason-core.h

+10 −1
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ 
	FN(NEIGH_QUEUEFULL)		\

	FN(NEIGH_DEAD)			\

	FN(TC_EGRESS)			\

	FN(SECURITY_HOOK)		\

	FN(QDISC_DROP)			\

	FN(CPU_BACKLOG)			\

	FN(XDP)				\
@@ -105,7 +106,13 @@ enum skb_drop_reason { 
	SKB_CONSUMED,

	/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */

	SKB_DROP_REASON_NOT_SPECIFIED,

	/** @SKB_DROP_REASON_NO_SOCKET: socket not found */

	/**

	 * @SKB_DROP_REASON_NO_SOCKET: no valid socket that can be used.

	 * Reason could be one of three cases:

	 * 1) no established/listening socket found during lookup process

	 * 2) no valid request socket during 3WHS process

	 * 3) no valid child socket during 3WHS process

	 */

	SKB_DROP_REASON_NO_SOCKET,

	/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */

	SKB_DROP_REASON_PKT_TOO_SMALL,
@@ -271,6 +278,8 @@ enum skb_drop_reason { 
	SKB_DROP_REASON_NEIGH_DEAD,

	/** @SKB_DROP_REASON_TC_EGRESS: dropped in TC egress HOOK */

	SKB_DROP_REASON_TC_EGRESS,

	/** @SKB_DROP_REASON_SECURITY_HOOK: dropped due to security HOOK */

	SKB_DROP_REASON_SECURITY_HOOK,

	/**

	 * @SKB_DROP_REASON_QDISC_DROP: dropped by qdisc when packet outputting (

	 * failed to enqueue to current qdisc)