Commit 3d359fab authored by Jason Xing's avatar Jason Xing Committed by David S. Miller
Browse files

tcp: introduce dropreasons in receive path 



Soon later patches can use these relatively more accurate
reasons to recognise and find out the cause.

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 253541a3

include/net/dropreason-core.h

+14 −1
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
	FN(TCP_AOFAILURE)		\

	FN(SOCKET_BACKLOG)		\

	FN(TCP_FLAGS)			\

	FN(TCP_ABORT_ON_DATA)		\

	FN(TCP_ZEROWINDOW)		\

	FN(TCP_OLD_DATA)		\

	FN(TCP_OVERWINDOW)		\
@@ -37,6 +38,7 @@ 
	FN(TCP_RFC7323_PAWS)		\

	FN(TCP_OLD_SEQUENCE)		\

	FN(TCP_INVALID_SEQUENCE)	\

	FN(TCP_INVALID_ACK_SEQUENCE)	\

	FN(TCP_RESET)			\

	FN(TCP_INVALID_SYN)		\

	FN(TCP_CLOSE)			\
@@ -204,6 +206,11 @@ enum skb_drop_reason { 
	SKB_DROP_REASON_SOCKET_BACKLOG,

	/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */

	SKB_DROP_REASON_TCP_FLAGS,

	/**

	 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to

	 * LINUX_MIB_TCPABORTONDATA

	 */

	SKB_DROP_REASON_TCP_ABORT_ON_DATA,

	/**

	 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,

	 * see LINUX_MIB_TCPZEROWINDOWDROP
@@ -228,13 +235,19 @@ enum skb_drop_reason { 
	SKB_DROP_REASON_TCP_OFOMERGE,

	/**

	 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to

	 * LINUX_MIB_PAWSESTABREJECTED

	 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED

	 */

	SKB_DROP_REASON_TCP_RFC7323_PAWS,

	/** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */

	SKB_DROP_REASON_TCP_OLD_SEQUENCE,

	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */

	SKB_DROP_REASON_TCP_INVALID_SEQUENCE,

	/**

	 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ

	 * field because ack sequence is not in the window between snd_una

	 * and snd_nxt

	 */

	SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,

	/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */

	SKB_DROP_REASON_TCP_RESET,

	/**