networkd: add support to configure virtual CAN device (#4139)

1. add support for kind vcan
2. fixup indention netlink-types.c, networkd-netdev.c

1 files changed, 38 insertions, 0 deletions

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index aab40a0eb1..1687d9bf31 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1787,6 +1787,31 @@ static int link_down(Link *link) {
         return 0;
 }
 
+static int link_up_can(Link *link) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+        int r;
+
+        assert(link);
+
+        log_link_debug(link, "Bringing CAN link up");
+
+        r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
+
+        r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not set link flags: %m");
+
+        r = sd_netlink_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
+
+        link_ref(link);
+
+        return 0;
+}
+
 static int link_handle_bound_to_list(Link *link) {
         Link *l;
         Iterator i;
@@ -2431,6 +2456,19 @@ static int link_configure(Link *link) {
         assert(link->network);
         assert(link->state == LINK_STATE_PENDING);
 
+        if (streq_ptr(link->kind, "vcan")) {
+
+                if (!(link->flags & IFF_UP)) {
+                        r = link_up_can(link);
+                        if (r < 0) {
+                                link_enter_failed(link);
+                                return r;
+                        }
+                }
+
+                return 0;
+        }
+
         /* Drop foreign config, but ignore loopback or critical devices.
          * We do not want to remove loopback address or addresses used for root NFS. */
         if (!(link->flags & IFF_LOOPBACK) && !(link->network->dhcp_critical)) {