[PATCH net-next v4 1/5] tcp: add dropreasons definitions and prepare for cookie check

[Jason Xing <kerneljasonxing@gmail.com>]

From: Jason Xing <kernelxing@tencent.com>

Only add five drop reasons to detect the condition of skb dropped
in cookie check for later use.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
--
v2
Link: https://lore.kernel.org/netdev/20240212172302.3f95e454@kernel.org/
1. fix misspelled name in kdoc as Jakub said
---
 include/net/dropreason-core.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 6d3a20163260..065caba42b0b 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -6,6 +6,7 @@
 #define DEFINE_DROP_REASON(FN, FNe)	\
 	FN(NOT_SPECIFIED)		\
 	FN(NO_SOCKET)			\
+	FN(NO_REQSK_ALLOC)		\
 	FN(PKT_TOO_SMALL)		\
 	FN(TCP_CSUM)			\
 	FN(SOCKET_FILTER)		\
@@ -43,10 +44,12 @@
 	FN(TCP_FASTOPEN)		\
 	FN(TCP_OLD_ACK)			\
 	FN(TCP_TOO_OLD_ACK)		\
+	FN(COOKIE_NOCHILD)		\
 	FN(TCP_ACK_UNSENT_DATA)		\
 	FN(TCP_OFO_QUEUE_PRUNE)		\
 	FN(TCP_OFO_DROP)		\
 	FN(IP_OUTNOROUTES)		\
+	FN(IP_ROUTEOUTPUTKEY)		\
 	FN(BPF_CGROUP_EGRESS)		\
 	FN(IPV6DISABLED)		\
 	FN(NEIGH_CREATEFAIL)		\
@@ -54,6 +57,7 @@
 	FN(NEIGH_QUEUEFULL)		\
 	FN(NEIGH_DEAD)			\
 	FN(TC_EGRESS)			\
+	FN(SECURITY_HOOK)		\
 	FN(QDISC_DROP)			\
 	FN(CPU_BACKLOG)			\
 	FN(XDP)				\
@@ -71,6 +75,7 @@
 	FN(TAP_TXFILTER)		\
 	FN(ICMP_CSUM)			\
 	FN(INVALID_PROTO)		\
+	FN(INVALID_DST)			\
 	FN(IP_INADDRERRORS)		\
 	FN(IP_INNOROUTES)		\
 	FN(PKT_TOO_BIG)			\
@@ -107,6 +112,11 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_NOT_SPECIFIED,
 	/** @SKB_DROP_REASON_NO_SOCKET: socket not found */
 	SKB_DROP_REASON_NO_SOCKET,
+	/**
+	 * @SKB_DROP_REASON_NO_REQSK_ALLOC: request socket allocation failed
+	 * probably because of no available memory for now
+	 */
+	SKB_DROP_REASON_NO_REQSK_ALLOC,
 	/** @SKB_DROP_REASON_PKT_TOO_SMALL: packet size is too small */
 	SKB_DROP_REASON_PKT_TOO_SMALL,
 	/** @SKB_DROP_REASON_TCP_CSUM: TCP checksum error */
@@ -243,6 +253,11 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_TCP_OLD_ACK,
 	/** @SKB_DROP_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
 	SKB_DROP_REASON_TCP_TOO_OLD_ACK,
+	/**
+	 * @SKB_DROP_REASON_COOKIE_NOCHILD: no child socket in cookie mode
+	 * reason could be the failure of child socket allocation
+	 */
+	SKB_DROP_REASON_COOKIE_NOCHILD,
 	/**
 	 * @SKB_DROP_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
 	 * sent yet
@@ -254,6 +269,8 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_TCP_OFO_DROP,
 	/** @SKB_DROP_REASON_IP_OUTNOROUTES: route lookup failed */
 	SKB_DROP_REASON_IP_OUTNOROUTES,
+	/** @SKB_DROP_REASON_IP_ROUTEOUTPUTKEY: route output key failed */
+	SKB_DROP_REASON_IP_ROUTEOUTPUTKEY,
 	/**
 	 * @SKB_DROP_REASON_BPF_CGROUP_EGRESS: dropped by BPF_PROG_TYPE_CGROUP_SKB
 	 * eBPF program
@@ -271,6 +288,8 @@ 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)
@@ -333,6 +352,8 @@ enum skb_drop_reason {
 	 * such as a broadcasts ICMP_TIMESTAMP
 	 */
 	SKB_DROP_REASON_INVALID_PROTO,
+	/** @SKB_DROP_REASON_INVALID_DST: look-up dst entry error */
+	SKB_DROP_REASON_INVALID_DST,
 	/**
 	 * @SKB_DROP_REASON_IP_INADDRERRORS: host unreachable, corresponding to
 	 * IPSTATS_MIB_INADDRERRORS
-- 
2.37.3