Contribute can gateway configuration feature

.github/workflows/compile.yml

@@ -41,6 +41,7 @@ jobs:
                 intltool \
                 libtool \
                 make \
+                pkg-config \
                 sed
 
     - name: autogen

.gitignore

@@ -21,8 +21,13 @@ autom4te.cache/
 
 src/.libs/
 src/*.l*
+src/*.gcda
+src/*.gcno
 tests/.libs/
 tests/test
+test/gwtest
+test/*.gcda
+test/*.gcno
 
 *~
 *.o

GNUmakefile.am

@@ -3,6 +3,10 @@ SUBDIRS = \
 	config \
 	src
 
+if ENABLE_TEST
+SUBDIRS += test
+endif
+
 EXTRA_DIST = \
 	autogen.sh \
 	config/m4/.secret-world-domination-project

configure.ac

@@ -95,7 +95,7 @@ if test "${CONFIG_DEBUG}" = "yes"; then
     CFLAGS="${CFLAGS} -Werror -Wsign-compare -Wfloat-equal -Wformat-security -g -O1"
     AC_DEFINE(DEBUG, 1, [debugging])
 else
-    CFLAGS="${CFLAGS} -O2"
+    CFLAGS="${CFLAGS} -g -O2"
 fi
 
 
@@ -115,13 +115,51 @@ if test "${CONFIG_ERROR_LOG}" = "no"; then
     AC_DEFINE(DISABLE_ERROR_LOG, 1, [disable error logging])
 fi
 
+#
+# Enable gcov
+#
+AC_MSG_CHECKING([whether to enable gcov])
+AC_ARG_ENABLE([gcov],
+  [AS_HELP_STRING([--enable-gcov], [Enable gcov in build time (for debug, default is no)])],
+  [:],
+  [enable_gcov=no])
+AC_MSG_RESULT([$enable_gcov])
+if test "$enable_gcov" = "yes"; then
+    CFLAGS="${CFLAGS} -coverage"
+fi
+
+#
+# Enable address-sanitizer
+#
+AC_MSG_CHECKING([whether to enable address-sanitizer])
+AC_ARG_ENABLE([address-sanitizer],
+  [AS_HELP_STRING([--enable-address-sanitizer], [Enable address sanitizer in build time (for debug, default is no)])],
+  [:],
+  [enable_address_sanitizer=no])
+AC_MSG_RESULT([$enable_address_sanitizer])
+if test "$enable_address_sanitizer" = "yes"; then
+    CFLAGS="${CFLAGS} -fsanitize=address"
+fi
+
+#
+# Enable unit test
+#
+AC_ARG_ENABLE([test],
+  [AS_HELP_STRING([--enable-test], [Enable unit test build (cmocka is required, default is no])],
+  [:],
+  [enable_test=no])
+AM_CONDITIONAL([ENABLE_TEST], [test "$enable_test" = "yes"])
+AS_CASE(
+  ["$enable_test"],
+  [yes], [PKG_CHECK_MODULES([CMOCKA], [cmocka])],[])
 
 AC_CONFIG_FILES([
 	GNUmakefile
 	config/libsocketcan.pc
 	config/GNUmakefile
 	include/GNUmakefile
 	src/GNUmakefile
+	test/GNUmakefile
 	])
 AC_OUTPUT
 

include/GNUmakefile.am

@@ -1,5 +1,6 @@
 nobase_include_HEADERS = \
 	libsocketcan.h \
+	libsocketcangw.h \
 	can_netlink.h
 
 MAINTAINERCLEANFILES = \

include/libsocketcangw.h

@@ -0,0 +1,65 @@
+/*
+ * libsocketcangw.h
+ *
+ * (C) 2025 Naoto Yamaguchi <naoto.yamaguchi@aisin.co.jp>
+ *
+ * This library is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2.1 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but without
+ * any warranty; without even the implied warranty of merchantability or fitness
+ * for a particular purpose. see the gnu lesser general public license for more
+ * details.
+ *
+ * you should have received a copy of the gnu lesser general public license
+ * along with this library; if not, write to the free software foundation, inc.,
+ * 59 temple place, suite 330, boston, ma 02111-1307 usa
+ */
+
+ #ifndef _socketcangw_netlink_h
+ #define _socketcangw_netlink_h
+
+ /**
+  * @file
+  * @brief API overview
+  */
+ #include <linux/can.h>
+
+ #ifdef __cplusplus
+ extern "C" {
+ #endif
+
+#define SOCKETCAN_GW_RULE_ECHO		(0x00000001U)
+#define SOCKETCAN_GW_RULE_FILTER	(0x00000002U)
+
+struct s_socketcan_gw_rule {
+	unsigned int src_ifindex;
+	unsigned int dst_ifindex;
+
+	unsigned int	options;
+
+	unsigned int	echo;
+	struct can_filter filter;
+ };
+typedef struct s_socketcan_gw_rule socketcan_gw_rule_t;
+
+struct s_socketcan_gw_rules {
+	size_t rule_num;
+	socketcan_gw_rule_t **rules;
+	// internal use
+	size_t array_num;
+ };
+typedef struct s_socketcan_gw_rules socketcan_gw_rules_t;
+
+int cangw_add_rule(socketcan_gw_rule_t *rule);
+int cangw_delete_rule(socketcan_gw_rule_t *rule);
+int cangw_clean_rule(void);
+int cangw_get_rules(socketcan_gw_rules_t **gw_rules);
+int cangw_release_rules(socketcan_gw_rules_t *gw_rules);
+
+ #ifdef __cplusplus
+ }
+ #endif
+
+ #endif

src/GNUmakefile.am

@@ -4,7 +4,10 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/include \
 	-I$(top_builddir)/include
 
-libsocketcan_la_SOURCES = libsocketcan.c
+libsocketcan_la_SOURCES = \
+	libsocketcan-utils.c \
+	libsocketcan.c \
+	libcangw.c
 
 libsocketcan_la_LDFLAGS = \
 	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
@@ -15,3 +18,5 @@ libsocketcan_la_LDFLAGS = \
 #
 MAINTAINERCLEANFILES = \
 	GNUmakefile.in
+
+CLEANFILES = *.gcda *.gcno