diff options
| author | Davide Caratti <dcaratti@redhat.com> | 2020-06-29 22:26:20 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-06-29 17:29:38 -0700 |
| commit | e1ff9e82e2ea53d01540692a85c16a77e1089537 (patch) | |
| tree | bc7595d123dbe4387d044322b0d38592428b9a64 /net/mptcp/options.c | |
| parent | e11703330a5df48e1fd4167e4d22a102e517253e (diff) | |
| download | lwn-e1ff9e82e2ea53d01540692a85c16a77e1089537.tar.gz lwn-e1ff9e82e2ea53d01540692a85c16a77e1089537.zip | |
net: mptcp: improve fallback to TCP
Keep using MPTCP sockets and a use "dummy mapping" in case of fallback
to regular TCP. When fallback is triggered, skip addition of the MPTCP
option on send.
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/11
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/22
Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/options.c')
| -rw-r--r-- | net/mptcp/options.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index df9a51425c6f..b96d3660562f 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -624,6 +624,9 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, opts->suboptions = 0; + if (unlikely(mptcp_check_fallback(sk))) + return false; + if (mptcp_established_options_mp(sk, skb, &opt_size, remaining, opts)) ret = true; else if (mptcp_established_options_dss(sk, skb, &opt_size, remaining, @@ -714,7 +717,8 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *sk, */ if (!mp_opt->mp_capable) { subflow->mp_capable = 0; - tcp_sk(sk)->is_mptcp = 0; + pr_fallback(msk); + __mptcp_do_fallback(msk); return false; } @@ -814,6 +818,9 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb, struct mptcp_options_received mp_opt; struct mptcp_ext *mpext; + if (__mptcp_check_fallback(msk)) + return; + mptcp_get_options(skb, &mp_opt); if (!check_fully_established(msk, sk, subflow, skb, &mp_opt)) return; |