-static int rtnl_set_properties(sd_rtnl *rtnl, int ifindex, const char *name, const struct ether_addr *mac, unsigned int mtu) {
- _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
- bool need_update = false;
- int r;
-
- assert(rtnl);
- assert(ifindex > 0);
-
- r = sd_rtnl_message_link_new(RTM_NEWLINK, ifindex, 0, 0, &message);
- if (r < 0)
- return r;
-
- if (name) {
- r = sd_rtnl_message_append(message, IFLA_IFNAME, name);
- if (r < 0)
- return r;
-
- need_update = true;
- }
-
- if (mac) {
- r = sd_rtnl_message_append(message, IFLA_ADDRESS, mac);
- if (r < 0)
- return r;
-
- need_update = true;
- }
-
- if (mtu > 0) {
- r = sd_rtnl_message_append(message, IFLA_MTU, &mtu);
- if (r < 0)
- return r;
-
- need_update = true;
- }
-
- if (need_update) {
- r = sd_rtnl_send_with_reply_and_block(rtnl, message, 5 * USEC_PER_SEC, NULL);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static bool enable_name_policy(void) {
- _cleanup_free_ char *line;
- char *w, *state;
- int r;
- size_t l;
-
- r = read_one_line_file("/proc/cmdline", &line);
- if (r < 0) {
- log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
- return true; /* something is very wrong, let's not make it worse */
- }
-
- FOREACH_WORD_QUOTED(w, l, line, state)
- if (strneq(w, "net.ifnames=0", l))
- return false;
-
- return true;
-}
-