find_interface
if ((ifd = find_interface(li->sdl_index)) == NULL) {
static struct interface_data * find_interface(int index);
Interface *ifc_n = find_interface(ifc_i->addr, node);
ifc = find_interface(ifc_addr, node);
Interface *ifc_n = find_interface(ifc_i->addr, node);
ifc = find_interface(ifc_addr, node);
Interface * find_interface(u_int32_t addr, Node *node);