initial buildroot for linux 5.15

package/knock/Config.in

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+config BR2_PACKAGE_KNOCK
+	bool "knock"
+	help
+	  A port knocking implementation.
+	  Provides a daemon and a user application. Port knocking can be
+	  used to run an arbitrary application, once the daemon detects
+	  a predefined sequence of incoming TCP/UDP packets on a network
+	  interface. This can be used, e.g. to open up ports in a
+	  firewall.
+
+	  http://www.zeroflux.org/projects/knock
+
+if BR2_PACKAGE_KNOCK
+
+config BR2_PACKAGE_KNOCK_KNOCKD
+	bool "knockd"
+	default y
+	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBPCAP
+	help
+	  Enable knockd
+
+endif

package/knock/knock.hash

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+# locally computed hash
+sha256  7a82c276ca1540faa7f5bb25010f4a59d45323a31c44a30fbe4a6e484dd18b1a  knock-0.8.tar.gz
+sha256  d747e19206e41702e40822dd91d37cbf40edd86f364ea416d667a0e3013f7189  COPYING

package/knock/knock.mk

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+################################################################################
+#
+# knock
+#
+################################################################################
+
+KNOCK_VERSION = 0.8
+KNOCK_SITE = $(call github,jvinet,knock,v$(KNOCK_VERSION))
+KNOCK_AUTORECONF = YES
+KNOCK_LICENSE = GPL-2.0+
+KNOCK_LICENSE_FILES = COPYING
+
+ifeq ($(BR2_PACKAGE_KNOCK_KNOCKD),y)
+KNOCK_DEPENDENCIES += libpcap
+KNOCK_CONF_OPTS += --enable-knockd
+ifeq ($(BR2_STATIC_LIBS),y)
+KNOCK_CONF_OPTS += LIBS="`$(STAGING_DIR)/usr/bin/pcap-config --static --additional-libs`"
+endif
+else
+KNOCK_CONF_OPTS += --disable-knockd
+endif
+
+$(eval $(autotools-package))