-/* If 'netdev_name' is the name of a VLAN network device (e.g. one created with
- * vconfig(8)), sets '*vlan_vid' to the VLAN VID associated with that device
- * and returns 0. Otherwise returns a errno value (specifically ENOENT if
- * 'netdev_name' is the name of a network device that is not a VLAN device) and
- * sets '*vlan_vid' to -1. */
-static int
-netdev_linux_get_vlan_vid(const struct netdev *netdev, int *vlan_vid)
-{
- const char *netdev_name = netdev_get_name(netdev);
- struct ds line = DS_EMPTY_INITIALIZER;
- FILE *stream = NULL;
- int error;
- char *fn;
-
- COVERAGE_INC(netdev_get_vlan_vid);
- fn = xasprintf("/proc/net/vlan/%s", netdev_name);
- stream = fopen(fn, "r");
- if (!stream) {
- error = errno;
- goto done;
- }
-
- if (ds_get_line(&line, stream)) {
- if (ferror(stream)) {
- error = errno;
- VLOG_ERR_RL(&rl, "error reading \"%s\": %s", fn, strerror(errno));
- } else {
- error = EPROTO;
- VLOG_ERR_RL(&rl, "unexpected end of file reading \"%s\"", fn);
- }
- goto done;
- }
-
- if (!sscanf(ds_cstr(&line), "%*s VID: %d", vlan_vid)) {
- error = EPROTO;
- VLOG_ERR_RL(&rl, "parse error reading \"%s\" line 1: \"%s\"",
- fn, ds_cstr(&line));
- goto done;
- }
-
- error = 0;
-
-done:
- free(fn);
- if (stream) {
- fclose(stream);
- }
- ds_destroy(&line);
- if (error) {
- *vlan_vid = -1;
- }
- return error;
-}
-