From: Geliang Tang <tanggeliang@kylinos.cn>

Since mptcp_pm_remove_addrs() is only called from the userspace PM, this
patch moves it into pm_userspace.c.

For this, lookup_subflow_by_saddr() and remove_anno_list_by_saddr()
helpers need to be exported in protocol.h. Also add "mptcp_" prefix for
these helpers.

Here, mptcp_pm_remove_addrs() is not changed to a static function because
it will be used in BPF Path Manager.

This patch doesn't change the behaviour of the code, just refactoring.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_netlink.c   | 46 ++++++++--------------------------------------
 net/mptcp/pm_userspace.c | 28 ++++++++++++++++++++++++++++
 net/mptcp/protocol.h     |  4 ++++
 3 files changed, 40 insertions(+), 38 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 7a0f7998376a5bb73a37829f9a6b3cdb9a3236a2..98ac73938bd8196e196d5ee8c264784ba8d37645 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -107,8 +107,8 @@ static void remote_address(const struct sock_common *skc,
 #endif
 }
 
-static bool lookup_subflow_by_saddr(const struct list_head *list,
-				    const struct mptcp_addr_info *saddr)
+bool mptcp_lookup_subflow_by_saddr(const struct list_head *list,
+				   const struct mptcp_addr_info *saddr)
 {
 	struct mptcp_subflow_context *subflow;
 	struct mptcp_addr_info cur;
@@ -1447,8 +1447,8 @@ int mptcp_pm_nl_add_addr_doit(struct sk_buff *skb, struct genl_info *info)
 	return ret;
 }
 
-static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
-				      const struct mptcp_addr_info *addr)
+bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk,
+				     const struct mptcp_addr_info *addr)
 {
 	struct mptcp_pm_add_entry *entry;
 
@@ -1476,7 +1476,7 @@ static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk,
 
 	list.ids[list.nr++] = mptcp_endp_get_local_id(msk, addr);
 
-	ret = remove_anno_list_by_saddr(msk, addr);
+	ret = mptcp_remove_anno_list_by_saddr(msk, addr);
 	if (ret || force) {
 		spin_lock_bh(&msk->pm.lock);
 		if (ret) {
@@ -1520,7 +1520,7 @@ static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
 		}
 
 		lock_sock(sk);
-		remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr);
+		remove_subflow = mptcp_lookup_subflow_by_saddr(&msk->conn_list, addr);
 		mptcp_pm_remove_anno_addr(msk, addr, remove_subflow &&
 					  !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT));
 
@@ -1633,36 +1633,6 @@ int mptcp_pm_nl_del_addr_doit(struct sk_buff *skb, struct genl_info *info)
 	return ret;
 }
 
-/* Called from the userspace PM only */
-void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list)
-{
-	struct mptcp_rm_list alist = { .nr = 0 };
-	struct mptcp_pm_addr_entry *entry;
-	int anno_nr = 0;
-
-	list_for_each_entry(entry, rm_list, list) {
-		if (alist.nr >= MPTCP_RM_IDS_MAX)
-			break;
-
-		/* only delete if either announced or matching a subflow */
-		if (remove_anno_list_by_saddr(msk, &entry->addr))
-			anno_nr++;
-		else if (!lookup_subflow_by_saddr(&msk->conn_list,
-						  &entry->addr))
-			continue;
-
-		alist.ids[alist.nr++] = entry->addr.id;
-	}
-
-	if (alist.nr) {
-		spin_lock_bh(&msk->pm.lock);
-		msk->pm.add_addr_signaled -= anno_nr;
-		mptcp_pm_remove_addr(msk, &alist);
-		spin_unlock_bh(&msk->pm.lock);
-	}
-}
-
-/* Called from the in-kernel PM only */
 static void mptcp_pm_flush_addrs_and_subflows(struct mptcp_sock *msk,
 					      struct list_head *rm_list)
 {
@@ -1671,11 +1641,11 @@ static void mptcp_pm_flush_addrs_and_subflows(struct mptcp_sock *msk,
 
 	list_for_each_entry(entry, rm_list, list) {
 		if (slist.nr < MPTCP_RM_IDS_MAX &&
-		    lookup_subflow_by_saddr(&msk->conn_list, &entry->addr))
+		    mptcp_lookup_subflow_by_saddr(&msk->conn_list, &entry->addr))
 			slist.ids[slist.nr++] = mptcp_endp_get_local_id(msk, &entry->addr);
 
 		if (alist.nr < MPTCP_RM_IDS_MAX &&
-		    remove_anno_list_by_saddr(msk, &entry->addr))
+		    mptcp_remove_anno_list_by_saddr(msk, &entry->addr))
 			alist.ids[alist.nr++] = mptcp_endp_get_local_id(msk, &entry->addr);
 	}
 
diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index afb04343e74d2340cd77e298489b55340dda0899..cac4b4a7b1e586b66d86c7a15462f642a7b0314f 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -287,6 +287,34 @@ static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk,
 	return err;
 }
 
+void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list)
+{
+	struct mptcp_rm_list alist = { .nr = 0 };
+	struct mptcp_pm_addr_entry *entry;
+	int anno_nr = 0;
+
+	list_for_each_entry(entry, rm_list, list) {
+		if (alist.nr >= MPTCP_RM_IDS_MAX)
+			break;
+
+		/* only delete if either announced or matching a subflow */
+		if (mptcp_remove_anno_list_by_saddr(msk, &entry->addr))
+			anno_nr++;
+		else if (!mptcp_lookup_subflow_by_saddr(&msk->conn_list,
+							&entry->addr))
+			continue;
+
+		alist.ids[alist.nr++] = entry->addr.id;
+	}
+
+	if (alist.nr) {
+		spin_lock_bh(&msk->pm.lock);
+		msk->pm.add_addr_signaled -= anno_nr;
+		mptcp_pm_remove_addr(msk, &alist);
+		spin_unlock_bh(&msk->pm.lock);
+	}
+}
+
 int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID];
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index a93e661ef5c435155066ce9cc109092661f0711c..5ba67cb601e02902ca6fcd91028ce36d30f45fc3 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -1027,6 +1027,10 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 struct mptcp_pm_add_entry *
 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
 				const struct mptcp_addr_info *addr);
+bool mptcp_lookup_subflow_by_saddr(const struct list_head *list,
+				   const struct mptcp_addr_info *saddr);
+bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk,
+				     const struct mptcp_addr_info *addr);
 int mptcp_pm_set_flags(struct sk_buff *skb, struct genl_info *info);
 int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info);
 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info);

-- 
2.45.2