initial buildroot for linux 5.15

package/libnftnl/Config.in

@@ -0,0 +1,25 @@
+comment "libnftnl needs a toolchain w/ headers >= 3.12"
+	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
+
+config BR2_PACKAGE_LIBNFTNL
+	bool "libnftnl"
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
+	select BR2_PACKAGE_LIBMNL
+	help
+	  libnftnl is a userspace library providing a low-level
+	  netlink programming interface (API) to the in-kernel
+	  nf_tables subsystem. The library libnftnl has been
+	  previously known as libnftables. This library is
+	  currently used by nftables.
+
+	  http://netfilter.org/projects/libnftnl/index.html
+
+if BR2_PACKAGE_LIBNFTNL
+
+config BR2_PACKAGE_LIBNFTNL_JSON
+	bool "enable JSON support"
+	select BR2_PACKAGE_JANSSON
+	help
+	  Enable JSON parsing support
+
+endif

package/libnftnl/libnftnl.hash

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+# From http://www.netfilter.org/projects/libnftnl/downloads.html
+sha256  90b01fddfe9be8c3245c3ba5ff5a4424a8df708828f92b2b361976b658c074f5  libnftnl-1.2.0.tar.bz2
+sha256  98193898c663001eff2fdcfb676e210c13042bc1a05e8d570c363efa396f8e24  COPYING

package/libnftnl/libnftnl.mk

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+################################################################################
+#
+# libnftnl
+#
+################################################################################
+
+LIBNFTNL_VERSION = 1.2.0
+LIBNFTNL_SITE = https://netfilter.org/projects/libnftnl/files
+LIBNFTNL_SOURCE = libnftnl-$(LIBNFTNL_VERSION).tar.bz2
+LIBNFTNL_LICENSE = GPL-2.0+
+LIBNFTNL_LICENSE_FILES = COPYING
+LIBNFTNL_INSTALL_STAGING = YES
+LIBNFTNL_DEPENDENCIES = host-pkgconf libmnl
+
+ifeq ($(BR2_PACKAGE_LIBNFTNL_JSON),y)
+LIBNFTNL_CONF_OPTS += --with-json-parsing
+LIBNFTNL_DEPENDENCIES += jansson
+else
+LIBNFTNL_CONF_OPTS += --without-json-parsing
+endif
+
+$(eval $(autotools-package))