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c0cb86e1d5
Rather than using the clunky, old, slower wireguard-linux-compat out of tree module, this commit does a patch-by-patch backport of upstream's wireguard to 5.4. This specific backport is in widespread use, being part of SUSE's enterprise kernel, Oracle's enterprise kernel, Google's Android kernel, Gentoo's distro kernel, and probably more I've forgotten about. It's definately the "more proper" way of adding wireguard to a kernel than the ugly compat.h hell of the wireguard-linux-compat repo. And most importantly for OpenWRT, it allows using the same module configuration code for 5.10 as for 5.4, with no need for bifurcation. These patches are from the backport tree which is maintained in the open here: https://git.zx2c4.com/wireguard-linux/log/?h=backport-5.4.y I'll be sending PRs to update this as needed. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> (cherry picked from commit3888fa7880) (cherry picked from commitd540725871) (cherry picked from commit196f3d586f) (cherry picked from commit3500fd7938) (cherry picked from commit23b801d3ba) (cherry picked from commit0c0cb97da7) (cherry picked from commit2a27f6f90a) Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
89 lines
3.3 KiB
Diff
89 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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Date: Wed, 6 May 2020 15:33:06 -0600
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Subject: [PATCH] wireguard: send/receive: use explicit unlikely branch instead
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of implicit coalescing
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commit 243f2148937adc72bcaaa590d482d599c936efde upstream.
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It's very unlikely that send will become true. It's nearly always false
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between 0 and 120 seconds of a session, and in most cases becomes true
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only between 120 and 121 seconds before becoming false again. So,
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unlikely(send) is clearly the right option here.
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What happened before was that we had this complex boolean expression
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with multiple likely and unlikely clauses nested. Since this is
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evaluated left-to-right anyway, the whole thing got converted to
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unlikely. So, we can clean this up to better represent what's going on.
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The generated code is the same.
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Suggested-by: Sultan Alsawaf <sultan@kerneltoast.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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drivers/net/wireguard/receive.c | 13 ++++++-------
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drivers/net/wireguard/send.c | 15 ++++++---------
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2 files changed, 12 insertions(+), 16 deletions(-)
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--- a/drivers/net/wireguard/receive.c
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+++ b/drivers/net/wireguard/receive.c
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@@ -226,21 +226,20 @@ void wg_packet_handshake_receive_worker(
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static void keep_key_fresh(struct wg_peer *peer)
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{
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struct noise_keypair *keypair;
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- bool send = false;
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+ bool send;
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if (peer->sent_lastminute_handshake)
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return;
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rcu_read_lock_bh();
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keypair = rcu_dereference_bh(peer->keypairs.current_keypair);
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- if (likely(keypair && READ_ONCE(keypair->sending.is_valid)) &&
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- keypair->i_am_the_initiator &&
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- unlikely(wg_birthdate_has_expired(keypair->sending.birthdate,
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- REJECT_AFTER_TIME - KEEPALIVE_TIMEOUT - REKEY_TIMEOUT)))
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- send = true;
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+ send = keypair && READ_ONCE(keypair->sending.is_valid) &&
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+ keypair->i_am_the_initiator &&
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+ wg_birthdate_has_expired(keypair->sending.birthdate,
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+ REJECT_AFTER_TIME - KEEPALIVE_TIMEOUT - REKEY_TIMEOUT);
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rcu_read_unlock_bh();
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- if (send) {
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+ if (unlikely(send)) {
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peer->sent_lastminute_handshake = true;
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wg_packet_send_queued_handshake_initiation(peer, false);
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}
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--- a/drivers/net/wireguard/send.c
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+++ b/drivers/net/wireguard/send.c
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@@ -124,20 +124,17 @@ void wg_packet_send_handshake_cookie(str
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static void keep_key_fresh(struct wg_peer *peer)
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{
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struct noise_keypair *keypair;
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- bool send = false;
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+ bool send;
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rcu_read_lock_bh();
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keypair = rcu_dereference_bh(peer->keypairs.current_keypair);
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- if (likely(keypair && READ_ONCE(keypair->sending.is_valid)) &&
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- (unlikely(atomic64_read(&keypair->sending.counter.counter) >
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- REKEY_AFTER_MESSAGES) ||
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- (keypair->i_am_the_initiator &&
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- unlikely(wg_birthdate_has_expired(keypair->sending.birthdate,
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- REKEY_AFTER_TIME)))))
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- send = true;
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+ send = keypair && READ_ONCE(keypair->sending.is_valid) &&
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+ (atomic64_read(&keypair->sending.counter.counter) > REKEY_AFTER_MESSAGES ||
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+ (keypair->i_am_the_initiator &&
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+ wg_birthdate_has_expired(keypair->sending.birthdate, REKEY_AFTER_TIME)));
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rcu_read_unlock_bh();
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- if (send)
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+ if (unlikely(send))
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wg_packet_send_queued_handshake_initiation(peer, false);
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}
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