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tcp: TCP experimental option for SMC

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The SMC protocol [1] relies on the use of a new TCP experimental
option [2, 3]. With this option, SMC capabilities are exchanged
between peers during the TCP three way handshake. This patch adds
support for this experimental option to TCP.

References:
[1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609
[2] Shared Use of TCP Experimental Options RFC 6994:
    https://tools.ietf.org/rfc/rfc6994.txt
[3] IANA ExID SMCR:
http://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-exids

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2017-10-25 11:01:45 +02:00 • committed by David S. Miller
parent 145686baab
commit 60e2a77807
7 changed files with 136 additions and 6 deletions
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3
include/net/inet_sock.h
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@ -92,7 +92,8 @@ struct inet_request_sock {
wscale_ok : 1,
ecn_ok : 1,
acked : 1,
no_srccheck: 1;
no_srccheck: 1,
smc_ok : 1;
kmemcheck_bitfield_end(flags);
u32 ir_mark;
union {