Introduce compiler for pcap filters/cBPF programs to XDP programs

Makefile

@@ -15,7 +15,8 @@ endif
 
 include version.mk
 
-UTILS := xdp-filter xdp-loader xdp-dump xdp-bench xdp-monitor xdp-trafficgen
+UTILS := xdp-filter xdp-loader xdp-dump xdp-bench xdp-monitor xdp-trafficgen \
+	 filterc
 SUBDIRS := lib $(UTILS)
 .PHONY: check_submodule help clobber distclean clean install test libxdp $(SUBDIRS)
 

filterc/.gitignore

@@ -0,0 +1,2 @@
+filterc
+tests/test_bpfc

filterc/Makefile

@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+TOOL_NAME := filterc
+USER_TARGETS := filterc
+# Just needed for tests
+XDP_TARGETS := tests/wrapper_prog
+TEST_TARGETS := tests/test_bpfc
+TEST_FILE := tests/test-filterc.sh
+
+EXTRA_BUILD := bpfc.o
+USER_GEN := $(EXTRA_BUILD)
+EXTRA_USER_DEPS := $(USER_GEN)
+
+LIB_DIR = ../lib
+USER_LIBS = $(EXTRA_BUILD) -lpcap -lelf
+
+include $(LIB_DIR)/common.mk
+
+$(EXTRA_BUILD): %.o: %.c %.h
+	$(QUIET_CC)$(CC) -Wall $(CFLAGS) -c $< -o $@