ng_ccatm(4) ATM Call Control netgraph node type


In netnatm/unimsg.h In netnatm/msg/unistruct.h In netnatm/sig/unidef.h In netnatm/api/unisap.h In netnatm/api/atmapi.h In netnatm/api/ccatm.h In netgraph.h In netgraph/ng_uni.h In netgraph/ng_ccatm.h


The node implements the API specified by the ATM Forum for access to ATM services (see ATM-Forum document af-saa-0108 ) This document specifies the semantics of the API, not the exact language binding. For this reason, it is expected that this implementation is neither compile-time nor binary compatible with other implementations of this API. It should, however, be fairly straightforward to convert between different API implementations.

This node is usually stacked on top of one or more UNI nodes (see ng_uni4). Each of these hooks appears as a ``port'' to the user of the node. It also has one hook connected to the ILMI daemon for management purposes.

The node is removed when it receives a NGM_SHUTDOWN messages or when all hooks are disconnected.


The node understands a number of hooks with predefined names and an unlimited number of hooks for user connections. The predefined names are:

uni NNN
These hooks stack the node on top of a UNI stack. The node expects the interface on these hooks to conform to the upper interface specified in ng_uni4. These hooks are forced into queuing mode, so that there are no circular calls from call control to UNI and UNI back to call control. The NNN in the hook name is the decimal port number and should not be zero. The port number is a 32-bit unsigned integer.
This hook should be connected to the ILMI daemon. No data is ever sent on this hook and all received data is discarded. The hook is used to send control messages along.
On receipt of a NGM_CCATM_DUMP command a textual description of the current state of the node is sent out of this hook. This text is sent as one large message consisting of more than one Vt mbuf .

All other hook names are taken to be user hooks and correspond to an ATM endpoint as specified in the ATM Forum document. The interface on these hooks is defined in In atmapi.h and uses a structure

struct ccatm_op {
        uint32_t        op;     /* request code */
        u_char          data[]; /* optional data */

This structure is followed directly by the data for the operation. The opcode is one of the following:

enum atmop {

These codes correspond directly to the operations specified in the ATM Forum document with the following exceptions:

As discussed in ng_uni4, this is used to ``synchronify'' the interface. The argument is a
struct atm_resp {
        int32_t         resp;
        uint32_t        data;           /* type of attached data */

If the response code resp is zero, the node has accepted the user request. If something goes wrong, resp contains an error code. For requests that return data, data contains a code describing the type of data and the data itself starts immediately after the structure.

This is the same as ATMOP_QUERY_CONNECTION_ATTRIBUTES except that it allows to query several attributes within one request.
This is the same as ATMOP_SET_CONNECTION_ATTRIBUTES except that it allows to set several attributes within one request. The list of attributes is followed directly by the attributes in the same order as they appear in the list.

If a user hook is disconnected, an active connection on that hook is released. Incoming connections waiting to be accepted are reoffered to other listening hooks or rejected.


Besides the generic messages the node understands the following special messages:

This causes the internal state of the node to be dumped in ASCII to the dump hook.
This message causes all connections on that port to be aborted (not released!) and all ATM endpoints which are bound to that port to be closed. It stops processing of all messages from the UNI stack on that port UNI stack. The argument is a
struct ngm_ccatm_port {
        uint32_t        port;

Start processing on the port. The argument is a Vt ngm_ccatm_port structure.
This message takes a Vt ngm_ccatm_port structure and clears all prefixes and addresses on that port. If the port number is zero, all ports are cleared.
NGM_CCATM_GET_ADDRESSES (get_addresses )
Get the list of all registered addresses on the given port. The argument is a Vt ngm_ccatm_port structure and the result is a Vt ngm_ccatm_get_addresses structure:
struct ngm_ccatm_get_addresses {
        uint32_t        count;
        struct ngm_ccatm_address_req addr[0];
struct ngm_ccatm_address_req {
        uint32_t        port;
        struct uni_addr addr;

If the port field is zero in the request, all addresses on all ports are returned. If it is not zero, only the addresses on that port are reported. The number of addresses is returned in the count field.

This message is used by ILMI to inform the node that a previous address registration request was successful. This causes the node to activate that address. The argument to the message is a Vt ngm_ccatm_address_req structure.
This message is used by ILMI to inform the node that an address has been unregistered. The node clears that address from its tables. The argument is a Vt ngm_ccatm_address_req structure.
NGM_CCATM_SET_PORT_PARAM (set_port_param )
This request sets the parameters on the given port. The argument is a
struct ngm_ccatm_atm_port {
        uint32_t port;          /* port for which to set parameters */
        uint32_t pcr;           /* port peak cell rate */
        uint32_t max_vpi_bits;
        uint32_t max_vci_bits;
        uint32_t max_svpc_vpi;
        uint32_t max_svcc_vpi;
        uint32_t min_svcc_vci;
        uint8_t  esi[6];
        uint32_t num_addr;

This should be used only by ILMI and when that port is stopped and the address and prefix tables of that port are empty. The num_addr field is ignored.

NGM_CCATM_GET_PORT_PARAM (get_port_param )
Retrieve the parameters of the given port. The argument is a Vt ngm_ccatm_port and the result a Vt ngm_ccatm_atm_port .
NGM_CCATM_GET_PORTLIST (get_portlist )
Get a list of all available ports on that node. This is returned as a
struct ngm_ccatm_portlist {
        uint32_t        nports;
        uint32_t        ports[];
Return the state of a port. The argument is a Vt struct ngm_ccatm_port and the return values as a Vt uint32_t .
This requests sets a new logging level and returns the previous one. The argument is either a Vt uint32_t in which case it specifies the new logging level, or may be empty in which case just the old level is returned as a Vt uint32_t .
Reset the node. This is allowed only if the number of user hooks and connected UNI stacks is zero.
Return extended status information from the node.


An Harti Brandt Aq [email protected]