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From:   Matthieu Baerts <matthieu.baerts@tessares.net>
Date:   Thu, 08 Jun 2023 15:20:51 +0200
Subject: [PATCH net-next 3/4] mptcp: unify pm get_flags_and_ifindex_by_id
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To:     mptcp@lists.linux.dev, Mat Martineau <martineau@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Geliang Tang <geliang.tang@suse.com>,
        Matthieu Baerts <matthieu.baerts@tessares.net>
Precedence: bulk

From: Geliang Tang <geliang.tang@suse.com>

This patch unifies the three PM get_flags_and_ifindex_by_id() interfaces:

mptcp_pm_nl_get_flags_and_ifindex_by_id() in mptcp/pm_netlink.c for the
in-kernel PM and mptcp_userspace_pm_get_flags_and_ifindex_by_id() in
mptcp/pm_userspace.c for the userspace PM.

They'll be switched in the common PM infterface
mptcp_pm_get_flags_and_ifindex_by_id() in mptcp/pm.c based on whether
mptcp_pm_is_userspace() or not.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 net/mptcp/pm.c           | 14 ++++++++++++++
 net/mptcp/pm_netlink.c   | 27 ++++++++-------------------
 net/mptcp/pm_userspace.c |  3 ---
 net/mptcp/protocol.h     |  2 ++
 4 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 5a027a46196c..2d04598dde05 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -419,6 +419,20 @@ int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
 	return mptcp_pm_nl_get_local_id(msk, &skc_local);
 }
 
+int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
+					 u8 *flags, int *ifindex)
+{
+	*flags = 0;
+	*ifindex = 0;
+
+	if (!id)
+		return 0;
+
+	if (mptcp_pm_is_userspace(msk))
+		return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk, id, flags, ifindex);
+	return mptcp_pm_nl_get_flags_and_ifindex_by_id(msk, id, flags, ifindex);
+}
+
 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)
 {
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 315ad669eb3c..e8b32d369f11 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1356,31 +1356,20 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
 	return ret;
 }
 
-int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
-					 u8 *flags, int *ifindex)
+int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
+					    u8 *flags, int *ifindex)
 {
 	struct mptcp_pm_addr_entry *entry;
 	struct sock *sk = (struct sock *)msk;
 	struct net *net = sock_net(sk);
 
-	*flags = 0;
-	*ifindex = 0;
-
-	if (id) {
-		if (mptcp_pm_is_userspace(msk))
-			return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
-									      id,
-									      flags,
-									      ifindex);
-
-		rcu_read_lock();
-		entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
-		if (entry) {
-			*flags = entry->flags;
-			*ifindex = entry->ifindex;
-		}
-		rcu_read_unlock();
+	rcu_read_lock();
+	entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
+	if (entry) {
+		*flags = entry->flags;
+		*ifindex = entry->ifindex;
 	}
+	rcu_read_unlock();
 
 	return 0;
 }
diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 27a275805c06..e1df3a4a4f23 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -85,9 +85,6 @@ int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
 {
 	struct mptcp_pm_addr_entry *entry, *match = NULL;
 
-	*flags = 0;
-	*ifindex = 0;
-
 	spin_lock_bh(&msk->pm.lock);
 	list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
 		if (id == entry->addr.id) {
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 8a2e01d10582..607cbd2ccb98 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -822,6 +822,8 @@ mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
 					 unsigned int id,
 					 u8 *flags, int *ifindex);
+int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
+					    u8 *flags, int *ifindex);
 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
 						   unsigned int id,
 						   u8 *flags, int *ifindex);

-- 
2.40.1