tcp: add support for optional TFO backup key to net.ipv4.tcp_fastopen_key

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Add the ability to add a backup TFO key as:

# echo "x-x-x-x,x-x-x-x" > /proc/sys/net/ipv4/tcp_fastopen_key

The key before the comma acks as the primary TFO key and the key after the
comma is the backup TFO key. This change is intended to be backwards
compatible since if only one key is set, userspace will simply read back
that single key as follows:

# echo "x-x-x-x" > /proc/sys/net/ipv4/tcp_fastopen_key
# cat /proc/sys/net/ipv4/tcp_fastopen_key
x-x-x-x

Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Jason Baron 2019-05-29 12:33:59 -04:00 • committed by David S. Miller

parent 0f1ce02368

commit aa1236cdfa

1 changed files with 71 additions and 24 deletions

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95

net/ipv4/sysctl_net_ipv4.c

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