sd-network: expose both admin and operational state directly

Also add a call to check if a link is loopback, as this should commonly be ignored.

src/libsystemd-network/network-internal.c

@@ -326,17 +326,3 @@ int net_parse_inaddr(const char *address, unsigned char *family, void *dst) {
 
         return 0;
 }
-
-bool link_has_carrier(unsigned flags, uint8_t operstate) {
-        /* see Documentation/networking/operstates.txt in the kernel sources */
-
-        if (operstate == IF_OPER_UP)
-                return true;
-
-        if (operstate == IF_OPER_UNKNOWN)
-                /* operstate may not be implemented, so fall back to flags */
-                if ((flags & IFF_LOWER_UP) && !(flags & IFF_DORMANT))
-                        return true;
-
-        return false;
-}

src/libsystemd-network/network-internal.h

@@ -65,5 +65,3 @@ int config_parse_ifalias(const char *unit, const char *filename, unsigned line,
 int net_parse_inaddr(const char *address, unsigned char *family, void *dst);
 
 int net_get_unique_predictable_data(struct udev_device *device, uint8_t result[8]);
-
-bool link_has_carrier(unsigned flags, uint8_t operstate);