[PATCH net-next v5 01/11] tcp: add a dropreason definitions and prepare for cookie check

[Jason Xing <kerneljasonxing@gmail.com>]

From: Jason Xing <kernelxing@tencent.com>

Only add one drop reason to detect the condition of skb dropped
because of hook points in cookie check for later use.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
--
v5
Link: https://lore.kernel.org/netdev/CANn89i+iELpsoea6+C-08m6+=JkneEEM=nAj-28eNtcOCkwQjw@mail.gmail.com/
Link: https://lore.kernel.org/netdev/632c6fd4-e060-4b8e-a80e-5d545a6c6b6c@kernel.org/
1. Use SKB_DROP_REASON_IP_OUTNOROUTES instead of introducing a new one (Eric, David)
2. Reuse SKB_DROP_REASON_NOMEM to handle failure of request socket allocation (Eric)
3. Reuse NO_SOCKET instead of introducing COOKIE_NOCHILD
4. Reuse IP_OUTNOROUTES instead of INVALID_DST (Eric)
5. adjust the title and description.

v4
Link: https://lore.kernel.org/netdev/20240212172302.3f95e454@kernel.org/
1. fix misspelled name in kdoc as Jakub said
---
 include/net/dropreason-core.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 6d3a20163260..3aaccad4eb20 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -54,6 +54,7 @@
 	FN(NEIGH_QUEUEFULL)		\
 	FN(NEIGH_DEAD)			\
 	FN(TC_EGRESS)			\
+	FN(SECURITY_HOOK)		\
 	FN(QDISC_DROP)			\
 	FN(CPU_BACKLOG)			\
 	FN(XDP)				\
@@ -271,6 +272,8 @@ 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)
-- 
2.37.3