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mptcp: parse and emit MP_CAPABLE option according to v1 spec

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This implements MP_CAPABLE options parsing and writing according
to RFC 6824 bis / RFC 8684: MPTCP v1.

Local key is sent on syn/ack, and both keys are sent on 3rd ack.
MP_CAPABLE messages len are updated accordingly. We need the skbuff to
correctly emit the above, so we push the skbuff struct as an argument
all the way from tcp code to the relevant mptcp callbacks.

When processing incoming MP_CAPABLE + data, build a full blown DSS-like
map info, to simplify later processing.  On child socket creation, we
need to record the remote key, if available.

Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Paasch 2020-01-21 16:56:31 -08:00 • committed by David S. Miller
parent 65492c5a6a
commit cc7972ea19
7 changed files with 160 additions and 46 deletions
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2
net/ipv4/tcp_output.c
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@ -685,7 +685,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
if (sk_is_mptcp(sk)) {
unsigned int size;
if (mptcp_syn_options(sk, &size, &opts->mptcp)) {
if (mptcp_syn_options(sk, skb, &size, &opts->mptcp)) {
opts->options |= OPTION_MPTCP;
remaining -= size;
}