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NAME

     ng_ccatm - ATM Call Control netgraph node type

SYNOPSIS

     #include <netnatm/unimsg.h>
     #include <netnatm/msg/unistruct.h>
     #include <netnatm/sig/unidef.h>
     #include <netnatm/api/unisap.h>
     #include <netnatm/api/atmapi.h>
     #include <netnatm/api/ccatm.h>
     #include <netgraph.h>
     #include <netgraph/ng_uni.h>
     #include <netgraph/ng_ccatm.h>

DESCRIPTION

     The ng_ccatm 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_uni(4)).  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.

HOOKS

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

     uniNNN   These hooks stack the ng_ccatm node on top of a UNI stack.  The
              node expects the interface on these hooks to conform to the
              upper interface specified in ng_uni(4).  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.

     manage   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.

     dump     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
              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 #include <atmapi.h>
     and uses a structure

     struct ccatm_op {
             u_int32_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 {
             ATMOP_RESP,
             ATMOP_ABORT_CONNECTION,
             ATMOP_ACCEPT_INCOMING_CALL,
             ATMOP_ADD_PARTY,
             ATMOP_ADD_PARTY_REJECT,
             ATMOP_ADD_PARTY_SUCCESS,
             ATMOP_ARRIVAL_OF_INCOMING_CALL,
             ATMOP_CALL_RELEASE,
             ATMOP_CONNECT_OUTGOING_CALL,
             ATMOP_DROP_PARTY,
             ATMOP_GET_LOCAL_PORT_INFO,
             ATMOP_P2MP_CALL_ACTIVE,
             ATMOP_P2P_CALL_ACTIVE,
             ATMOP_PREPARE_INCOMING_CALL,
             ATMOP_PREPARE_OUTGOING_CALL,
             ATMOP_QUERY_CONNECTION_ATTRIBUTES,
             ATMOP_REJECT_INCOMING_CALL,
             ATMOP_SET_CONNECTION_ATTRIBUTES,
             ATMOP_WAIT_ON_INCOMING_CALL,
             ATMOP_SET_CONNECTION_ATTRIBUTES_X,
             ATMOP_QUERY_CONNECTION_ATTRIBUTES_X,
             ATMOP_QUERY_STATE
     };

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

     ATMOP_RESP
             As discussed in ng_uni(4), 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.

     ATMOP_QUERY_CONNECTION_ATTRIBUTES_X
             This is the same as ATMOP_QUERY_CONNECTION_ATTRIBUTES except that
             it allows to query several attributes within one request.

     ATMOP_SET_CONNECTION_ATTRIBUTES_X
             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.

CONTROL MESSAGES

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

     NGM_CCATM_DUMP
             This causes the internal state of the node to be dumped in ASCII
             to the dump hook.

     NGM_CCATM_STOP
             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;
             };

     NGM_CCATM_START
             Start processing on the port.  The argument is a ngm_ccatm_port
             structure.

     NGM_CCATM_CLEAR
             This message takes a 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 the list of all registered addresses on the given port.  The
             argument is a ngm_ccatm_port structure and the result is a
             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 {
                     u_int32_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.

     NGM_CCATM_ADDRESS_REGISTERED
             This message is used by ILMI to inform the ng_ccatm node that a
             previous address registration request was successful.  This
             causes the node to activate that address.  The argument to the
             message is a ngm_ccatm_address_req structure.

     NGM_CCATM_ADDRESS_UNREGISTERED
             This message is used by ILMI to inform the ng_ccatm node that an
             address has been unregistered.  The node clears that address from
             its tables.  The argument is a ngm_ccatm_address_req structure.

     NGM_CCATM_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
             Retrieve the parameters of the given port.  The argument is a
             ngm_ccatm_port and the result a ngm_ccatm_atm_port.

     NGM_CCATM_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[];
             };

     NGM_CCATM_GETSTATE
             Return the state of a port.  The argument is a struct
             ngm_ccatm_port and the return values as a uint32_t.

     NGM_CCATM_SETLOG
             This requests sets a new logging level and returns the previous
             one.  The argument is either a 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 uint32_t.

     NGM_CCATM_RESET
             Reset the node.  This is allowed only if the number of user hooks
             and connected UNI stacks is zero.

     NGM_CCATM_GET_EXSTAT
             Return extended status information from the node.

SEE ALSO

     netgraph(4), ng_uni(4), ngctl(8)

AUTHORS

     Harti Brandt 〈harti@FreeBSD.org