ng_ccatm(4)

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 lan
guage 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 be
tween 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 prede
fined 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 dae
mon. No data
is ever sent on this hook and all received data
is discarded. The hook is used to send control mes
sages along.
dump On receipt of a NGM_CCATM_DUMP command a textu
al description
of the current state of the node is sent out of
this hook.
This text is sent as one large message consist
ing of more
than one mbuf.
All other hook names are taken to be user hooks and corre
spond to an ATM
endpoint as specified in the ATM Forum document. The inter
face 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 op
eration. 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 ``syn
chronify'' 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 ac
cepted 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 immedi
ately after the
structure.
ATMOP_QUERY_CONNECTION_ATTRIBUTES_X
This is the same as ATMOP_QUERY_CONNECTION_AT
TRIBUTES except that
it allows to query several attributes within one re
quest.
ATMOP_SET_CONNECTION_ATTRIBUTES_X
This is the same as ATMOP_SET_CONNECTION_ATTRIBUTES
except that
it allows to set several attributes within one re
quest. 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 fol
lowing 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 mes
sages 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 num
ber is zero,
all ports are cleared.
NGM_CCATM_GET_ADDRESSES
Get the list of all registered addresses on the giv
en port. The
argument is a ngm_ccatm_port structure and the re
sult 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 ad
dresses on all
ports are returned. If it is not zero, only the ad
dresses 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 success
ful. This
causes the node to activate that address. The argu
ment 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 ar
gument 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>
BSD March 10, 2005
Copyright © 2010-2019 Platon Technologies, s.r.o.           Home | Man pages | tLDP | Documents | Utilities | About
Design by styleshout