354 lines
11 KiB
Groff
354 lines
11 KiB
Groff
.\"
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.\" Copyright (c) 2001-2003
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.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" Author: Hartmut Brandt <harti@freebsd.org>
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.\"
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.\" $FreeBSD$
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.\"
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.\" ng_atm(4) man page
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.\"
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.Dd June 24, 2003
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.Dt ng_atm 4
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.Os FreeBSD
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.Sh NAME
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.Nm ng_atm
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.Nd netgraph ATM node type
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.Sh SYNOPSIS
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.Fd #include <net/if_atm.h>
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.Fd #include <netgraph/ng_atm.h>
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.Sh DESCIPTION
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The
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.Nm
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netgraph node type allows
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.Xr natm 4
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ATM drivers to be connected to the
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.Xr netgraph 4
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networking subsystem.
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When the
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.Nm
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module is loaded a node is automatically create for each
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.Xr natm 4
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ATM interface. The nodes are named with the same name as the
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interface. Nodes are also created, if a driver for an ATM
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card is loaded after
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.Nm
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was loaded.
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.Pp
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.Nm
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nodes are persistent. They are removed when the interface is removed.
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SHUTDOWN messages are ignored by the node.
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.Sh HOOKS
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Four special hooks with fixed names and an unlimited number of hooks with user
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defined names are supported. Three of the fixed hooks are attached to
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strategic points in the information flow in the
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.Xr natm 4
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system and support only reading. The fourth fixed hook behaves like the other
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user hooks, but a number of management messages are sent along the hook.
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The other hooks can be attached to VCIs dynamically by means of
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control messages to the
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.Nm
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node and can be written and read.
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.Pp
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The four fixed hooks are:
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.Bl -tag -width orphans
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.It Dv input
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This is a connection to the raw input stream from the network.
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If this hook is connected, all incoming packets are delivered out to
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this hook. Note, that this redirects ALL input. Neither
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.Xr natm 4
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nor the user hooks will see any input if
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.Dv input
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is connected.
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An
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.Dv atm_pseudohdr
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(see
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.Xr natm 4 )
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is prepended to the actual data.
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.It Dv output
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This is a connection to the raw output stream to the network device.
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If this hook is connected, all outgoing packets are handed over to
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the netgraph system and delivered to the hook instead of beeing delivered
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to the ATM driver.
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An
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.Dv atm_pseudohdr
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(see
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.Xr natm 4 )
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is prepended to the actual data.
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.It Dv orphans
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This hook receives all packets that are unrecognized, i.e. do not belong to
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either a
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.Xr natm 4
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socket, a
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.Nm
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VCI or
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.Xr natm 4
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IP.
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Because ATM is connection oriented and packets are received on a given VCI only
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when someone initiates this VCI, packets should never be orphaned. There is
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however one exception: if you use
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.Xr natm 4
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IP with LLC/SNAP encapsulation packets with don't have the IP protocol
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indicated in the packet header are delivered out of this hook.
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An
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.Dv atm_pseudohdr
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(see
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.Xr natm 4 )
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is prepended to the actual data send out to the hook.
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.It Dv manage
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This hook behaves exactly like a normal user hook (see below) except, that
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the node at the other hand will receive management messages.
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.El
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.Pp
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Hooks for dynamically initiated VCIs can have whatever name is allowed by
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.Xr netgraph 4
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as long as the name does not collide with one of the three predefined names.
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.Pp
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To initiate packet sending an receiving on a dynamic hook one has to issue
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a
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.Dv NGM_ATM_CPCS_INIT
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control message. To terminate sending and receiving one must send a
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.Dv NGM_ATM_CPCS_TERM
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message (see
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.Sx CONTROL MESSAGES ) .
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The data send and received on these hooks has no additional
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headers.
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.Sh CONTROL MESSAGES
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This node type supports the generic messages plus the following:
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.Bl -tag -width xxx
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.It Dv NGM_ATM_GET_IFNAME
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Return the name of the interface as a NUL-terminated string.
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This is normally the same name as that of the node.
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.It Dv NGM_ATM_GET_CONFIG
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Returns a structure defining the configuration of the interface:
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.Bd -literal
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struct ng_atm_config {
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uint32_t pcr; /* peak cell rate */
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uint32_t maxvpi; /* maximum vpi */
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uint32_t maxvci; /* maximum vci */
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uint32_t max_vpcs; /* maximum number of VPCs */
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uint32_t max_vccs; /* maximum number of VCCs */
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};
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.Ed
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.It Dv NGM_ATM_GET_VCCS
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Returns the table of open VCCs from the driver. This table consists of
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a header and a variable sized array of entries, one for each open vcc:
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.Bd -literal
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struct atmio_vcctable {
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uint32_t count; /* number of vccs */
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struct atmio_vcc vccs[0]; /* array of VCCs */
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};
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struct atmio_vcc {
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uint16_t flags; /* flags */
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uint16_t vpi; /* VPI */
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uint16_t vci; /* VCI */
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uint16_t rmtu; /* Receive maximum CPCS size */
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uint16_t tmtu; /* Transmit maximum CPCS size */
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uint8_t aal; /* aal type */
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uint8_t traffic; /* traffic type */
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struct atmio_tparam tparam; /* traffic parameters */
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};
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struct atmio_tparam {
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uint32_t pcr; /* 24bit: Peak Cell Rate */
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uint32_t scr; /* 24bit: VBR Sustainable Cell Rate */
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uint32_t mbs; /* 24bit: VBR Maximum burst size */
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uint32_t mcr; /* 24bit: MCR */
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uint32_t icr; /* 24bit: ABR ICR */
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uint32_t tbe; /* 24bit: ABR TBE (1...2^24-1) */
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uint8_t nrm; /* 3bit: ABR Nrm */
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uint8_t trm; /* 3bit: ABR Trm */
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uint16_t adtf; /* 10bit: ABR ADTF */
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uint8_t rif; /* 4bit: ABR RIF */
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uint8_t rdf; /* 4bit: ABR RDF */
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uint8_t cdf; /* 3bit: ABR CDF */
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};
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.Ed
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.Pp
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Note, that this is the driver's table, so all VCCs opened via
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.Xr natm 4
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sockets and IP are also shown. They can, however, be distinguished by
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their flags. The
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.Dv flags
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field contains the following flags:
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.Bl -column ATM_PH_LLCSNAP -offset indent
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.It Dv ATM_PH_AAL5 Ta use AAL5 instead of AAL0
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.It Dv ATM_PH_LLCSNAP Ta if AAL5 use LLC SNAP encapsulation
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.It Dv ATM_FLAG_NG Ta this is a netgraph VCC
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.It Dv ATM_FLAG_HARP Ta this is a HARP VCC
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.It Dv ATM_FLAG_NORX Ta transmit only VCC
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.It Dv ATM_FLAG_NOTX Ta receive only VCC
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.It Dv ATMIO_FLAG_PVC Ta treat channel as a PVC
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.El
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.Pp
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If the
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.Dv ATM_FLAG_NG
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flag is set, then
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.Dv traffic
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and
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.Dv tparam
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contain meaningful information.
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.Pp
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.Dv aal
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contains one of the following values:
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.Bl -column ATM_PH_LLCSNAP -offset indent
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.It Dv ATMIO_AAL_0 Ta AAL 0 (raw cells)
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.It Dv ATMIO_AAL_34 Ta AAL 3 or AAL 4
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.It Dv ATMIO_AAL_5 Ta AAL 5
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.It Dv ATMIO_AAL_RAW Ta device specific raw cells
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.El
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.Pp
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.Dv traffic
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can have one of the following values (not all drivers support
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all traffic types however):
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.Bl -column ATM_PH_LLCSNAP -offset indent
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.It Dv ATMIO_TRAFFIC_UBR
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.It Dv ATMIO_TRAFFIC_CBR
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.It Dv ATMIO_TRAFFIC_ABR
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.It Dv ATMIO_TRAFFIC_VBR
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.El
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.It Dv NGM_ATM_CPCS_INIT
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Initialize a VCC for sending and receiving. The argument is a structure:
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.Bd -literal
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struct ng_atm_cpcs_init {
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char name[NG_HOOKLEN + 1];
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uint32_t flags; /* flags. (if_natmio.h) */
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uint16_t vci; /* VCI to open */
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uint16_t vpi; /* VPI to open */
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uint16_t rmtu; /* receive maximum PDU */
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uint16_t tmtu; /* transmit maximum PDU */
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uint8_t aal; /* AAL type (if_natmio.h) */
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uint8_t traffic; /* traffic type (if_natmio.h) */
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uint32_t pcr; /* Peak cell rate */
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uint32_t scr; /* Sustainable cell rate */
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uint32_t mbs; /* Maximum burst size */
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uint32_t mcr; /* Minimum cell rate */
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uint32_t icr; /* ABR: Initial cell rate */
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uint32_t tbe; /* ABR: Transmit buffer exposure */
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uint8_t nrm; /* ABR: Nrm */
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uint8_t trm; /* ABR: Trm */
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uint16_t adtf; /* ABR: ADTF */
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uint8_t rif; /* ABR: RIF */
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uint8_t rdf; /* ABR: RDF */
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uint8_t cdf; /* ABR: CDF */
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};
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.Ed
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.Pp
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.Dv name
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is the name of the hook for which sending and receiving should be enabled.
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This hook must already be connected.
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.Dv vpi
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and
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.Dv vci
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are the respective VPI and VCI values to use for the ATM cells. They must be
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withing the range, given by the
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.Dv maxvpi
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and
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.Dv maxvci
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fields of the
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.Dv ng_atm_config
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structure.
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.Dv flags
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contains the flags (see above) and the other fields describe the
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type of traffic.
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.It Dv NGM_ATM_CPCS_TERM
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Stop sending and receiving on the indicated hook. The argument is a
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.Bd -literal
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struct ng_atm_cpcs_term {
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char name[NG_HOOKLEN + 1];
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};
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.Ed
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.Sh MANAGEMENT MESSAGES
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If the
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.Dv manage
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hook is connected certain messages are sent along the hook. They are
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received by the peer node with a cookie of
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.Dv NG_ATM_COOKIE .
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.Bl -tag -width xxx
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.It Dv NGM_ATM_CARRIER_CHANGE
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The carrier state of the ATM physical interface has changed.
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The message has the following structure:
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.Bd -literal
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struct ng_atm_carrier_change {
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uint32_t node;
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uint32_t state;
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};
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.Ed
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.Pp
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.Dv node
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is the node Id of the ATM node. This can be used by the managing entity
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(for example
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.Xr ilmid 8 )
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to manage several interfaces at the same time through the same node.
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.Dv state is 1 if the carrier was detected and 0 if it was lost.
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.It Dv NGM_ATM_VCC_CHANGE
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A permanent VCC has been added, deleted or changed. This is used by
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.Xr ilmid
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to generate the appropriate ILMI traps. The structure of the message is:
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.Bd -literal
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struct ng_atm_vcc_change {
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uint32_t node;
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uint16_t vci;
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uint8_t vpi;
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uint8_t state;
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};
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.Ed
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Where
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.Dv state
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is 0 if the PVC was deleted and 1 if it was added or modified.
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.El
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.Sh FLOW CONTROL
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If the hardware driver supports it the node can emit flow control messages
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along a user hook. The format of these messages is described in
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.Pa netgraph/ng_message.h .
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The
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.Nm
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node may generate
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.Dv NGM_HIGH_WATER_PASSED and NGM_LOW_WATER_PASSED
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messages. The first one indicates that the hardware driver has stopped output
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on the channel and drops new packets, the second one reports that
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output was reenabled. Currently the structures are not filled with
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information.
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.Sh SHUTDOWN
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The nodes are persistent as long as the corresponding interface exists.
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Upon receipt of a
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.Dv NGM_SHUTDOWN
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messages all hooks are disconnected and the node is reinitialized. All
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VCCs opened via netgraph are closed. When the ATM interface is unloaded
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the node disappears.
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If the node is compiled with
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.Dv NGATM_DEBUG
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there is a sysctl
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.Cm net.graph.atm.allow_shutdown
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which when set to a non-zero values allows the nodes to shut down.
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Note, that this is intended for development only and may lead to kernel
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panics if set.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_ether 4 ,
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.Xr natm 4 ,
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.Xr ngctl 8
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.Sh AUTHORS
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.An Harti Brandt Aq harti@freebsd.org
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