kernel: 5.4: import wireguard backport

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>

1 files changed, 112 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0001-crypto-lib-tidy-up-lib-crypto-Kconfig-and-Makefile.patch b/target/linux/generic/backport-5.4/080-wireguard-0001-crypto-lib-tidy-up-lib-crypto-Kconfig-and-Makefile.patch
new file mode 100644
index 0000000000..9de7c9cb00
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0001-crypto-lib-tidy-up-lib-crypto-Kconfig-and-Makefile.patch
@@ -0,0 +1,112 @@
+From 7b5de278d022b3f31bc5b42cd160bea2e8bc4c74 Mon Sep 17 00:00:00 2001
+From: Ard Biesheuvel <ardb@kernel.org>
+Date: Fri, 8 Nov 2019 13:22:07 +0100
+Subject: [PATCH 001/124] crypto: lib - tidy up lib/crypto Kconfig and Makefile
+
+commit 746b2e024c67aa605ac12d135cd7085a49cf9dc4 upstream.
+
+In preparation of introducing a set of crypto library interfaces, tidy
+up the Makefile and split off the Kconfig symbols into a separate file.
+
+Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ crypto/Kconfig      | 13 +------------
+ lib/crypto/Kconfig  | 15 +++++++++++++++
+ lib/crypto/Makefile | 16 ++++++++--------
+ 3 files changed, 24 insertions(+), 20 deletions(-)
+ create mode 100644 lib/crypto/Kconfig
+
+--- a/crypto/Kconfig
++++ b/crypto/Kconfig
+@@ -878,9 +878,6 @@ config CRYPTO_SHA1_PPC_SPE
+ 	  SHA-1 secure hash standard (DFIPS 180-4) implemented
+ 	  using powerpc SPE SIMD instruction set.
+ 
+-config CRYPTO_LIB_SHA256
+-	tristate
+-
+ config CRYPTO_SHA256
+ 	tristate "SHA224 and SHA256 digest algorithm"
+ 	select CRYPTO_HASH
+@@ -1019,9 +1016,6 @@ config CRYPTO_GHASH_CLMUL_NI_INTEL
+ 
+ comment "Ciphers"
+ 
+-config CRYPTO_LIB_AES
+-	tristate
+-
+ config CRYPTO_AES
+ 	tristate "AES cipher algorithms"
+ 	select CRYPTO_ALGAPI
+@@ -1150,9 +1144,6 @@ config CRYPTO_ANUBIS
+ 	  <https://www.cosic.esat.kuleuven.be/nessie/reports/>
+ 	  <http://www.larc.usp.br/~pbarreto/AnubisPage.html>
+ 
+-config CRYPTO_LIB_ARC4
+-	tristate
+-
+ config CRYPTO_ARC4
+ 	tristate "ARC4 cipher algorithm"
+ 	select CRYPTO_BLKCIPHER
+@@ -1339,9 +1330,6 @@ config CRYPTO_CAST6_AVX_X86_64
+ 	  This module provides the Cast6 cipher algorithm that processes
+ 	  eight blocks parallel using the AVX instruction set.
+ 
+-config CRYPTO_LIB_DES
+-	tristate
+-
+ config CRYPTO_DES
+ 	tristate "DES and Triple DES EDE cipher algorithms"
+ 	select CRYPTO_ALGAPI
+@@ -1845,6 +1833,7 @@ config CRYPTO_STATS
+ config CRYPTO_HASH_INFO
+ 	bool
+ 
++source "lib/crypto/Kconfig"
+ source "drivers/crypto/Kconfig"
+ source "crypto/asymmetric_keys/Kconfig"
+ source "certs/Kconfig"
+--- /dev/null
++++ b/lib/crypto/Kconfig
+@@ -0,0 +1,15 @@
++# SPDX-License-Identifier: GPL-2.0
++
++comment "Crypto library routines"
++
++config CRYPTO_LIB_AES
++	tristate
++
++config CRYPTO_LIB_ARC4
++	tristate
++
++config CRYPTO_LIB_DES
++	tristate
++
++config CRYPTO_LIB_SHA256
++	tristate
+--- a/lib/crypto/Makefile
++++ b/lib/crypto/Makefile
+@@ -1,13 +1,13 @@
+ # SPDX-License-Identifier: GPL-2.0
+ 
+-obj-$(CONFIG_CRYPTO_LIB_AES) += libaes.o
+-libaes-y := aes.o
++obj-$(CONFIG_CRYPTO_LIB_AES)			+= libaes.o
++libaes-y					:= aes.o
+ 
+-obj-$(CONFIG_CRYPTO_LIB_ARC4) += libarc4.o
+-libarc4-y := arc4.o
++obj-$(CONFIG_CRYPTO_LIB_ARC4)			+= libarc4.o
++libarc4-y					:= arc4.o
+ 
+-obj-$(CONFIG_CRYPTO_LIB_DES) += libdes.o
+-libdes-y := des.o
++obj-$(CONFIG_CRYPTO_LIB_DES)			+= libdes.o
++libdes-y					:= des.o
+ 
+-obj-$(CONFIG_CRYPTO_LIB_SHA256) += libsha256.o
+-libsha256-y := sha256.o
++obj-$(CONFIG_CRYPTO_LIB_SHA256)			+= libsha256.o
++libsha256-y					:= sha256.o