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mptcp: Handle MP_CAPABLE options for outgoing connections

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Add hooks to tcp_output.c to add MP_CAPABLE to an outgoing SYN request,
to capture the MP_CAPABLE in the received SYN-ACK, to add MP_CAPABLE to
the final ACK of the three-way handshake.

Use the .sk_rx_dst_set() handler in the subflow proto to capture when the
responding SYN-ACK is received and notify the MPTCP connection layer.

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Krystad
2020-01-21 16:56:18 -08:00
committed by David S. Miller
parent 2303f994b3
commit cec37a6e41
9 changed files with 663 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/tcp_input.c
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@ -5978,6 +5978,9 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
tcp_initialize_rcv_mss(sk);
if (sk_is_mptcp(sk))
mptcp_rcv_synsent(sk);
/* Remember, tcp_poll() does not lock socket!
* Change state from SYN-SENT only after copied_seq
* is initialized. */
@ -6600,6 +6603,9 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
tcp_rsk(req)->af_specific = af_ops;
tcp_rsk(req)->ts_off = 0;
#if IS_ENABLED(CONFIG_MPTCP)
tcp_rsk(req)->is_mptcp = 0;
#endif
tcp_clear_options(&tmp_opt);
tmp_opt.mss_clamp = af_ops->mss_clamp;