netdev - [PATCH v2 3/7] net/handshake: Expose handshake_sk_destruct

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Message-ID: <20250905024659.811386-4-alistair.francis@wdc.com>
Date: Fri,  5 Sep 2025 12:46:55 +1000
From: alistair23@...il.com
To: chuck.lever@...cle.com,
	hare@...nel.org,
	kernel-tls-handshake@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-nvme@...ts.infradead.org,
	linux-nfs@...r.kernel.org
Cc: kbusch@...nel.org,
	axboe@...nel.dk,
	hch@....de,
	sagi@...mberg.me,
	kch@...dia.com,
	alistair23@...il.com,
	Alistair Francis <alistair.francis@....com>
Subject: [PATCH v2 3/7] net/handshake: Expose handshake_sk_destruct_req publically

From: Alistair Francis <alistair.francis@....com>

Define a `handshake_sk_destruct_req()` function and expose it publically
so that other subsystems can destruct the handshake req.

This will be used as part of the KeyUpdate to ensure any existing
requests anre cancelled and destructed if required.

This is required to avoid hash conflicts when handshake_req_hash_add()
is called as part of submitting the KeyUpdate request.

Signed-off-by: Alistair Francis <alistair.francis@....com>
---
v2:
 - Fix build failures

 include/net/handshake.h |  1 +
 net/handshake/request.c | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/net/handshake.h b/include/net/handshake.h
index 10f301f3c660..89dc169eae89 100644
--- a/include/net/handshake.h
+++ b/include/net/handshake.h
@@ -44,6 +44,7 @@ bool tls_handshake_cancel(struct sock *sk);
 void tls_handshake_close(struct socket *sock);
 
 bool handshake_req_cancel(struct sock *sk);
+void handshake_sk_destruct_req(struct sock *sk);
 
 u8 tls_get_record_type(const struct sock *sk, const struct cmsghdr *msg);
 void tls_alert_recv(const struct sock *sk, const struct msghdr *msg,
diff --git a/net/handshake/request.c b/net/handshake/request.c
index 02269f212c70..bb61c9a1a03d 100644
--- a/net/handshake/request.c
+++ b/net/handshake/request.c
@@ -342,3 +342,20 @@ bool handshake_req_cancel(struct sock *sk)
 	return true;
 }
 EXPORT_SYMBOL(handshake_req_cancel);
+
+/**
+ * handshake_sk_destruct_req - destroy an existing request
+ * @sk: socket on which there is an existing request
+ */
+void handshake_sk_destruct_req(struct sock *sk)
+{
+	struct handshake_req *req;
+
+	req = handshake_req_hash_lookup(sk);
+	if (!req)
+		return;
+
+	trace_handshake_destruct(sock_net(sk), req, sk);
+	handshake_req_destroy(req);
+}
+EXPORT_SYMBOL(handshake_sk_destruct_req);
-- 
2.50.1