mptcp: export mptcp_genl_family & mptcp_nl_fill_addr

This patch exports struct mptcp_genl_family and mptcp_nl_fill_addr() helper
to allow them can be used in pm_userspace.c.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mptcp/pm_netlink.c

@@ -18,9 +18,6 @@
 #include "protocol.h"
 #include "mib.h"
 
-/* forward declaration */
-static struct genl_family mptcp_genl_family;
-
 static int pm_nl_pernet_id;
 
 struct mptcp_pm_add_entry {
@@ -1636,8 +1633,8 @@ int mptcp_pm_nl_flush_addrs_doit(struct sk_buff *skb, struct genl_info *info)
 	return 0;
 }
 
-static int mptcp_nl_fill_addr(struct sk_buff *skb,
-			      struct mptcp_pm_addr_entry *entry)
+int mptcp_nl_fill_addr(struct sk_buff *skb,
+		       struct mptcp_pm_addr_entry *entry)
 {
 	struct mptcp_addr_info *addr = &entry->addr;
 	struct nlattr *attr;
@@ -2281,7 +2278,7 @@ void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
 	nlmsg_free(skb);
 }
 
-static struct genl_family mptcp_genl_family __ro_after_init = {
+struct genl_family mptcp_genl_family __ro_after_init = {
 	.name		= MPTCP_PM_NAME,
 	.version	= MPTCP_PM_VER,
 	.netnsok	= true,

net/mptcp/protocol.h

@@ -343,6 +343,8 @@ struct mptcp_sock {
 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp)			\
 	list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node)
 
+extern struct genl_family mptcp_genl_family;
+
 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
 {
 	sock_owned_by_me((const struct sock *)msk);
@@ -996,6 +998,8 @@ void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflo
 				     const struct mptcp_options_received *mp_opt);
 void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow,
 					      struct request_sock *req);
+int mptcp_nl_fill_addr(struct sk_buff *skb,
+		       struct mptcp_pm_addr_entry *entry);
 
 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
 {