wireguard: receive: drop handshakes if queue lock is contended

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commit fb32f4f606 upstream.

If we're being delivered packets from multiple CPUs so quickly that the
ring lock is contended for CPU tries, then it's safe to assume that the
queue is near capacity anyway, so just drop the packet rather than
spinning. This helps deal with multicore DoS that can interfere with
data path performance. It _still_ does not completely fix the issue, but
it again chips away at it.

Reported-by: Streun Fabio <fstreun@student.ethz.ch>
Fixes: e7096c131e ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jason A. Donenfeld 2021-11-29 10:39:27 -05:00 • committed by Greg Kroah-Hartman

parent af794a64d6

commit 2745192cb7

1 changed files with 13 additions and 3 deletions

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drivers/net/wireguard/receive.c

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