[MPTCP][PATCH v2 net 2/2] mptcp: fix subflow's remote_id issues

[Geliang Tang]

This patch set the init remote_id to zero, otherwise it will be a random
number.

Then it added the missing subflow's remote_id setting code both in
__mptcp_subflow_connect and in subflow_ulp_clone.

Fixes: 01cacb00b35cb ("mptcp: add netlink-based PM")
Fixes: ec3edaa7ca6ce ("mptcp: Add handling of outgoing MP_JOIN requests")
Fixes: f296234c98a8f ("mptcp: Add handling of incoming MP_JOIN requests")
Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 net/mptcp/pm_netlink.c | 2 +-
 net/mptcp/subflow.c    | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 3e70d848033d..bd88e9c0bf71 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -181,9 +181,9 @@ static void check_work_pending(struct mptcp_sock *msk)
 
 static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
 {
+       struct mptcp_addr_info remote = { 0 };
        struct sock *sk = (struct sock *)msk;
        struct mptcp_pm_addr_entry *local;
-       struct mptcp_addr_info remote;
        struct pm_nl_pernet *pernet;
 
        pernet = net_generic(sock_net((struct sock *)msk), pm_nl_pernet_id);
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index e8cac2655c82..9ead43f79023 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1063,6 +1063,7 @@ int __mptcp_subflow_connect(struct sock *sk, int ifindex,
        struct mptcp_sock *msk = mptcp_sk(sk);
        struct mptcp_subflow_context *subflow;
        struct sockaddr_storage addr;
+       int remote_id = remote->id;
        int local_id = loc->id;
        struct socket *sf;
        struct sock *ssk;
@@ -1107,10 +1108,11 @@ int __mptcp_subflow_connect(struct sock *sk, int 
ifindex,
                goto failed;
 
        mptcp_crypto_key_sha(subflow->remote_key, &remote_token, NULL);
-       pr_debug("msk=%p remote_token=%u local_id=%d", msk, remote_token,
-                local_id);
+       pr_debug("msk=%p remote_token=%u local_id=%d remote_id=%d", msk,
+                remote_token, local_id, remote_id);
        subflow->remote_token = remote_token;
        subflow->local_id = local_id;
+       subflow->remote_id = remote_id;
        subflow->request_join = 1;
        subflow->request_bkup = 1;
        mptcp_info2sockaddr(remote, &addr);
@@ -1347,6 +1349,7 @@ static void subflow_ulp_clone(const struct request_sock 
*req,
                new_ctx->fully_established = 1;
                new_ctx->backup = subflow_req->backup;
                new_ctx->local_id = subflow_req->local_id;
+               new_ctx->remote_id = subflow_req->remote_id;
                new_ctx->token = subflow_req->token;
                new_ctx->thmac = subflow_req->thmac;
        }
-- 
2.17.1