Merge branch 'mptcp-refactor'

Mat Martineau says:

====================
mptcp: Refactor ADD_ADDR/RM_ADDR handling

This patch set changes the way MPTCP ADD_ADDR and RM_ADDR options are
handled to improve the reliability of sending and updating address
advertisements. The information used to populate outgoing advertisement
option headers is now stored separately to avoid rare cases where a more
recent request would overwrite something that had not been sent
yet. While the peers would recover from this, it's better to avoid the
problem in the first place.

Patch 1 moves an advertisement option check under a lock so the changes
made in the next several patches will not introduce a race.

Patches 2-4 make sure ADD_ADDR, ADD_ADDR echo, and RM_ADDR options use
separate flags and data.

Patch 5 removes some now-redundant flags.

Patch 6 adds a selftest that confirms the advertisement reliability
improvements.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 14 deletions

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index bc1bfd7ac9c1..7cd3d5979bcd 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -178,8 +178,6 @@ enum mptcp_pm_status {
 enum mptcp_addr_signal_status {
 	MPTCP_ADD_ADDR_SIGNAL,
 	MPTCP_ADD_ADDR_ECHO,
-	MPTCP_ADD_ADDR_IPV6,
-	MPTCP_ADD_ADDR_PORT,
 	MPTCP_RM_ADDR_SIGNAL,
 };
 
@@ -748,22 +746,18 @@ void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
 
 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
 {
-	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
+	return READ_ONCE(msk->pm.addr_signal) &
+		(BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
 }
 
-static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
+static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
 {
-	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
-}
-
-static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
-{
-	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
+	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
 }
 
-static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
+static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
 {
-	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
+	return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
 }
 
 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
@@ -794,8 +788,10 @@ static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
 	return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
 }
 
-bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
-			      struct mptcp_addr_info *saddr, bool *echo, bool *port);
+bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
+			      unsigned int opt_size, unsigned int remaining,
+			      struct mptcp_addr_info *addr, bool *echo,
+			      bool *port, bool *drop_other_suboptions);
 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
 			     struct mptcp_rm_list *rm_list);
 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);