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mptcp: fallback to TCP after SYN+MPC drops

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Some middleboxes might be nasty with MPTCP, and decide to drop packets
with MPTCP options, instead of just dropping the MPTCP options (or
letting them pass...).

In this case, it sounds better to fallback to "plain" TCP after 2
retransmissions, and try again.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/477
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240909-net-next-mptcp-fallback-x-mpc-v1-2-da7ebb4cd2a3@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0)
2024-09-09 22:09:22 +02:00
committed by Jakub Kicinski
parent 65b02260a0
commit 6982826fe5
5 changed files with 27 additions and 0 deletions
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4
include/net/mptcp.h
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@@ -223,6 +223,8 @@ static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
return htonl(0u);
}
void mptcp_active_detect_blackhole(struct sock *sk, bool expired);
#else
static inline void mptcp_init(void)
@@ -307,6 +309,8 @@ static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct reques
}
static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
static inline void mptcp_active_detect_blackhole(struct sock *sk, bool expired) { }
#endif /* CONFIG_MPTCP */
#if IS_ENABLED(CONFIG_MPTCP_IPV6)