[PATCH v2 1/8] rmnet: Add skeleton

Add skeleton of the RMNet interface management module.  Implement the
basic API structure and register the module with oFono core.
---
 Makefile.am |  2 ++
 src/rmnet.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/rmnet.h | 25 +++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 src/rmnet.c
 create mode 100644 src/rmnet.h

diff --git a/Makefile.am b/Makefile.am
index d379201d362b..d107dc410fd2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -353,6 +353,8 @@ builtin_sources += plugins/u8500.c
 endif
 
 if QMIMODEM
+builtin_sources += src/rmnet.h src/rmnet.c
+
 qmi_sources = drivers/qmimodem/qmi.h drivers/qmimodem/qmi.c \
 					drivers/qmimodem/ctl.h \
 					drivers/qmimodem/dms.h \
diff --git a/src/rmnet.c b/src/rmnet.c
new file mode 100644
index 000000000000..58f841a49a59
--- /dev/null
+++ b/src/rmnet.c
@@ -0,0 +1,59 @@
+/*
+ *  oFono - Open Source Telephony
+ *  Copyright (C) 2024  Cruise, LLC
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stddef.h>
+#include <errno.h>
+#include <unistd.h>
+#include <linux/rtnetlink.h>
+#include <net/if.h>
+
+#include <ell/ell.h>
+
+#include "ofono.h"
+#include "rmnet.h"
+
+static struct l_netlink *rtnl;
+
+int rmnet_get_interfaces(uint32_t parent_ifindex, unsigned int n_interfaces,
+				rmnet_new_interfaces_func_t cb,
+				void *user_data, rmnet_destroy_func_t destroy)
+{
+	return -ENOTSUP;
+}
+
+int rmnet_del_interfaces(unsigned int n_interfaces,
+					const struct rmnet_ifinfo *interfaces)
+{
+	return -ENOTSUP;
+}
+
+int rmnet_cancel(int id)
+{
+	return -ENOTSUP;
+}
+
+static int rmnet_init(void)
+{
+	DBG("");
+
+	rtnl = l_netlink_new(NETLINK_ROUTE);
+	if (!rtnl)
+		return -EIO;
+
+	return 0;
+}
+
+static void rmnet_exit(void)
+{
+	l_netlink_destroy(rtnl);
+}
+
+OFONO_MODULE(rmnet, rmnet_init, rmnet_exit)
diff --git a/src/rmnet.h b/src/rmnet.h
new file mode 100644
index 000000000000..dc416e0d5d51
--- /dev/null
+++ b/src/rmnet.h
@@ -0,0 +1,25 @@
+/*
+ *  oFono - Open Source Telephony
+ *  Copyright (C) 2024  Cruise, LLC
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+struct rmnet_ifinfo {
+	uint32_t ifindex;
+	uint16_t mux_id;
+	char ifname[IF_NAMESIZE];
+};
+
+typedef void (*rmnet_new_interfaces_func_t)(int error,
+					unsigned int n_interfaces,
+					const struct rmnet_ifinfo *interfaces,
+					void *user_data);
+typedef void (*rmnet_destroy_func_t)(void *user_data);
+
+int rmnet_get_interfaces(uint32_t parent_ifindex, unsigned int n_interfaces,
+				rmnet_new_interfaces_func_t cb,
+				void *user_data, rmnet_destroy_func_t destroy);
+int rmnet_del_interfaces(unsigned int n_interfaces,
+					const struct rmnet_ifinfo *interfaces);
+int rmnet_cancel(int id);
-- 
2.47.0