netdev - [PATCH net-next 3/7] mptcp: store remote id from MP

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Date:   Mon,  2 May 2022 13:52:33 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Kishen Maloor <kishen.maloor@...el.com>, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, matthieu.baerts@...sares.net,
        mptcp@...ts.linux.dev,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 3/7] mptcp: store remote id from MP_JOIN SYN/ACK in local ctx

From: Kishen Maloor <kishen.maloor@...el.com>

This change reads the addr id assigned to the remote endpoint
of a subflow from the MP_JOIN SYN/ACK message and stores it
in the related subflow context. The remote id was not being
captured prior to this change, and will now provide a consistent
view of remote endpoints and their ids as seen through netlink
events.

Acked-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Kishen Maloor <kishen.maloor@...el.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/subflow.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 9567231a4bfa..a0e7af33fb26 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -443,6 +443,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 		subflow->backup = mp_opt.backup;
 		subflow->thmac = mp_opt.thmac;
 		subflow->remote_nonce = mp_opt.nonce;
+		subflow->remote_id = mp_opt.join_id;
 		pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u backup=%d",
 			 subflow, subflow->thmac, subflow->remote_nonce,
 			 subflow->backup);
-- 
2.36.0