Subject: [PATCH net-next v2 4/6] tcp: support rstreason for passive reset

From: Jason Xing <[email-masked]>
Date: Thu, 4 Apr 2024 15:20:45 +0800

From: Jason Xing <[email-masked]>

Reuse the dropreason logic to show the exact reason of tcp reset,
so we don't need to implement those duplicated reset reasons.
This patch replaces all the prior NOT_SPECIFIED reasons.

Signed-off-by: Jason Xing <[email-masked]>
---
 net/ipv4/tcp_ipv4.c | 8 ++++----
 net/ipv6/tcp_ipv6.c | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d8d98db8f58e..1ae2716f0c34 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1935,7 +1935,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 	return 0;
 
 reset:
-	tcp_v4_send_reset(rsk, skb, SK_RST_REASON_NOT_SPECIFIED);
+	tcp_v4_send_reset(rsk, skb, reason);
 discard:
 	kfree_skb_reason(skb, reason);
 	/* Be careful here. If this function gets more complicated and
@@ -2280,7 +2280,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 		} else {
 			drop_reason = tcp_child_process(sk, nsk, skb);
 			if (drop_reason) {
-				tcp_v4_send_reset(nsk, skb, SK_RST_REASON_NOT_SPECIFIED);
+				tcp_v4_send_reset(nsk, skb, drop_reason);
 				goto discard_and_relse;
 			}
 			sock_put(sk);
@@ -2358,7 +2358,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 bad_packet:
 		__TCP_INC_STATS(net, TCP_MIB_INERRS);
 	} else {
-		tcp_v4_send_reset(NULL, skb, SK_RST_REASON_NOT_SPECIFIED);
+		tcp_v4_send_reset(NULL, skb, drop_reason);
 	}
 
 discard_it:
@@ -2409,7 +2409,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 		tcp_v4_timewait_ack(sk, skb);
 		break;
 	case TCP_TW_RST:
-		tcp_v4_send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
+		tcp_v4_send_reset(sk, skb, drop_reason);
 		inet_twsk_deschedule_put(inet_twsk(sk));
 		goto discard_it;
 	case TCP_TW_SUCCESS:;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7e591521b193..6889ea70c760 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1678,7 +1678,7 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 	return 0;
 
 reset:
-	tcp_v6_send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
+	tcp_v6_send_reset(sk, skb, reason);
 discard:
 	if (opt_skb)
 		__kfree_skb(opt_skb);
@@ -1864,7 +1864,7 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
 		} else {
 			drop_reason = tcp_child_process(sk, nsk, skb);
 			if (drop_reason) {
-				tcp_v6_send_reset(nsk, skb, SK_RST_REASON_NOT_SPECIFIED);
+				tcp_v6_send_reset(nsk, skb, drop_reason);
 				goto discard_and_relse;
 			}
 			sock_put(sk);
@@ -1940,7 +1940,7 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
 bad_packet:
 		__TCP_INC_STATS(net, TCP_MIB_INERRS);
 	} else {
-		tcp_v6_send_reset(NULL, skb, SK_RST_REASON_NOT_SPECIFIED);
+		tcp_v6_send_reset(NULL, skb, drop_reason);
 	}
 
 discard_it:
@@ -1995,7 +1995,7 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
 		tcp_v6_timewait_ack(sk, skb);
 		break;
 	case TCP_TW_RST:
-		tcp_v6_send_reset(sk, skb, SK_RST_REASON_NOT_SPECIFIED);
+		tcp_v6_send_reset(sk, skb, drop_reason);
 		inet_twsk_deschedule_put(inet_twsk(sk));
 		goto discard_it;
 	case TCP_TW_SUCCESS:
-- 
2.37.3