netdev - [PATCH net-next 09/16] mptcp: add a new helper subflow_req_create

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Message-Id: <20210129011115.133953-10-mathew.j.martineau@linux.intel.com>
Date:   Thu, 28 Jan 2021 17:11:08 -0800
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Geliang Tang <geliangtang@...il.com>, davem@...emloft.net,
        kuba@...nel.org, mptcp@...ts.01.org,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 09/16] mptcp: add a new helper subflow_req_create_thmac

From: Geliang Tang <geliangtang@...il.com>

This patch adds a new helper named subflow_req_create_thmac, which is
extracted from subflow_token_join_request. It initializes subflow_req's
local_nonce and thmac fields, those are the more expensive to populate.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/subflow.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 2dcc0fb5a69e..94926ab74d48 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -64,10 +64,23 @@ static bool mptcp_can_accept_new_subflow(const struct mptcp_sock *msk)
 }
 
 /* validate received token and create truncated hmac and nonce for SYN-ACK */
+static void subflow_req_create_thmac(struct mptcp_subflow_request_sock *subflow_req)
+{
+	struct mptcp_sock *msk = subflow_req->msk;
+	u8 hmac[SHA256_DIGEST_SIZE];
+
+	get_random_bytes(&subflow_req->local_nonce, sizeof(u32));
+
+	subflow_generate_hmac(msk->local_key, msk->remote_key,
+			      subflow_req->local_nonce,
+			      subflow_req->remote_nonce, hmac);
+
+	subflow_req->thmac = get_unaligned_be64(hmac);
+}
+
 static struct mptcp_sock *subflow_token_join_request(struct request_sock *req)
 {
 	struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
-	u8 hmac[SHA256_DIGEST_SIZE];
 	struct mptcp_sock *msk;
 	int local_id;
 
@@ -84,13 +97,6 @@ static struct mptcp_sock *subflow_token_join_request(struct request_sock *req)
 	}
 	subflow_req->local_id = local_id;
 
-	get_random_bytes(&subflow_req->local_nonce, sizeof(u32));
-
-	subflow_generate_hmac(msk->local_key, msk->remote_key,
-			      subflow_req->local_nonce,
-			      subflow_req->remote_nonce, hmac);
-
-	subflow_req->thmac = get_unaligned_be64(hmac);
 	return msk;
 }
 
@@ -186,6 +192,8 @@ static int subflow_init_req(struct request_sock *req,
 		if (!subflow_req->msk)
 			return -EPERM;
 
+		subflow_req_create_thmac(subflow_req);
+
 		if (unlikely(req->syncookie)) {
 			if (mptcp_can_accept_new_subflow(subflow_req->msk))
 				subflow_init_req_cookie_join_save(subflow_req, skb);
-- 
2.30.0