# ====================================================================
#
#      lwip_net.cdl
#
#      lwIP networking stack configuration data.
#
# ====================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 2008, 2009, 2010 Free Software Foundation
##
## eCos is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free
## Software Foundation; either version 2 or (at your option) any later version.
##
## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
## WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License along
## with eCos; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
##
## As a special exception, if other files instantiate templates or use macros
## or inline functions from this file, or you compile this file and link it
## with other works to produce a work based on this file, this file does not
## by itself cause the resulting work to be covered by the GNU General Public
## License. However the source code for this file must still be made available
## in accordance with section (3) of the GNU General Public License.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):	 Simon Kallweit
# Contributors:  John Dallaway
# Date:          2008-12-01
#
#####DESCRIPTIONEND####
#
# ====================================================================

cdl_package CYGPKG_NET_LWIP {
    display         "lwIP networking stack"
    description     "The lightweight TCP/IP stack."
    requires        CYGINT_ISO_ERRNO_CODES
	
    compile         core/dns.c                  \
                    core/init.c                 \
                    core/mem.c                  \
                    core/memp.c	                \
                    core/netif.c                \
                    core/pbuf.c                 \
                    core/raw.c                  \
                    core/stats.c                \
                    core/sys.c                  \
                    core/tcp_in.c               \
                    core/tcp_out.c              \
                    core/tcp.c                  \
                    core/udp.c                  \
                    core/ipv4/icmp.c            \
                    core/ipv4/igmp.c            \
                    core/ipv4/inet_chksum.c     \
                    core/ipv4/inet.c            \
                    core/ipv4/ip_addr.c         \
                    core/ipv4/ip_frag.c         \
                    core/ipv4/ip.c              \
                    api/api_lib.c               \
                    api/api_msg.c               \
                    api/err.c                   \
                    api/netbuf.c                \
                    api/netdb.c                 \
                    api/netifapi.c              \
                    api/sockets.c               \
                    api/tcpip.c                 \
                    ecos/sys_arch.c
                    
    cdl_interface CYGINT_LWIP_MODES {
        display         "Enabled lwIP modes"
        no_define
        requires        CYGINT_LWIP_MODES == 1
        description     "
            This interface is used to force mutually exclusive selection of
            the available lwIP modes."
    }
    
    cdl_option CYGFUN_LWIP_MODE_SIMPLE {
        display         "Simple mode"
        default_value   1
        implements      CYGINT_LWIP_MODES
        compile         ecos/simple.c
        description     "
            lwIP stack is configured to run in a single thread. Use this mode
            if lwIP should run with a minimum of resources. Note that you can
            only use the event based APIs in this mode."  
    }
    
    cdl_option CYGFUN_LWIP_MODE_SEQUENTIAL {
        display         "Sequential mode"
        implements      CYGINT_LWIP_MODES
        compile         ecos/sequential.c
        description     "
            lwIP stack is configured to run in multiple threads. Use this mode
            if you can spend some more resources on lwIP and you want to use
            the networking stack from within other threads using the more
            convenient netcomm and socket APIs." 
    }
    
    cdl_interface CYGINT_LWIP_SIO_REQUIRED {
        no_define
        display         "Items requiring lwIP serial operations"
        description     "
            Items requiring use of the lwIP serial operations code should
            implement this interface."
    }
    
    cdl_option CYGFUN_LWIP_SIO {
        display         "Serial operations support"
        calculated      { CYGINT_LWIP_SIO_REQUIRED > 0 }
        requires        CYGPKG_IO_SERIAL
        compile         ecos/sio.c
    }
    
    cdl_component CYGPKG_LWIP_APIS {
        display         "APIs"
        flavor          none
        no_define
        description     "
            Configuration for Application-Programming-Interfaces."
            
        cdl_component CYGPKG_LWIP_RAW {
            display         "RAW support"
            flavor          bool
            default_value   1
            description     "
                Enable application layer to hook into the IP layer itself."
            
            cdl_option CYGNUM_LWIP_RAW_TTL {
                display         "RAW Time-To-Live"
                flavor          data
                default_value   { CYGNUM_LWIP_IP_DEFAULT_TTL }
                description     "
                    Default value for Time-To-Live used by RAW packets."
            }
        }
        
        cdl_component CYGPKG_LWIP_NETIF_API {
            display         "Netif support"
            flavor          bool
            default_value   0
            description     "
                Support for the netif API."
        }
        
        cdl_component CYGPKG_LWIP_NETCONN_API {
            display         "Netconn support"
            flavor          bool
            default_value   1
            active_if       CYGFUN_LWIP_MODE_SEQUENTIAL
            requires        CYGFUN_LWIP_MODE_SEQUENTIAL
            description     "
                Support for the netconn API. Requires the \"Sequential\" mode."
        }
        
        cdl_component CYGPKG_LWIP_SOCKET_API {
            display         "Socket support"
            flavor          bool
            default_value   1
            active_if       CYGFUN_LWIP_MODE_SEQUENTIAL
            requires        CYGFUN_LWIP_MODE_SEQUENTIAL
            requires        CYGPKG_LWIP_NETCONN_API
            description     "
                Support for the socket API. Requires the \"Sequential\" mode."
                
            cdl_option CYGFUN_LWIP_COMPAT_SOCKETS {
                display         "BSD-style sockets"
                flavor          bool
                default_value   1
                description     "
                    Enable BSD-style sockets functions names."
            }
            
            cdl_option CYGFUN_LWIP_POSIX_SOCKETS_IO_NAMES {
                display         "POSIX-style sockets"
                flavor          bool
                default_value   1
                description     "
                    Enable POSIX-style sockets functions names. Disable this
                    option if you use a POSIX operating system that uses the
                    same names (read, write & close)."
            }
        
            cdl_option CYGFUN_LWIP_TCP_KEEPALIVE {
                display         "Keepalive options"
                flavor          bool
                default_value   0
                description     "
                    Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT options
                    processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have
                    to be set in seconds."
            }
            
            cdl_option CYGFUN_LWIP_SO_RCVTIMEO {
                display         "SO_RCVTIMEO option"
                flavor          bool
                default_value   0
                description     "
                    Enable SO_RCVTIMEO processing."
            }
            
            cdl_option CYGFUN_LWIP_SO_RCVBUF {
                display         "SO_RCVBUF option"
                flavor          bool
                default_value   0
                description     "
                    Enable SO_RCVBUF processing."
            }
        }
    }
    
    cdl_component CYGPKG_LWIP_PROTOCOLS {
        display         "Protocols"
        flavor          none
        no_define
        description     "
            Configuration options for protocols."
            
        cdl_component CYGPKG_LWIP_ARP {
            display         "ARP support"
            flavor          bool
            default_value   1
            compile         netif/etharp.c
            description     "
                Support for ARP functionality."
                
            cdl_option CYGNUM_LWIP_ARP_TABLE_SIZE {
                display         "ARP table size"
                flavor          data
                default_value   10
                description     "
                    Number of active MAC-IP address pairs cached."
            }
            
            cdl_option CYGFUN_LWIP_ARP_QUEUEING {
                display         "ARP queueing"
                flavor          bool
                default_value   1
                description     "
                    Outgoing packets are queued during hardware address
                    resolution."
            }
            
            cdl_option CYGFUN_LWIP_ETHARP_TRUST_IP_MAC {
                display         "Trust IP/MAC"
                flavor          bool
                default_value   1
                description     "
                    Incoming IP packets cause the ARP table to be updated with
                    the source MAC and IP addresses supplied in the packet. You
                    may want to disable this if you do not trust LAN peers to
                    have the correct addresses, or as a limited approach to
                    attempt to handle spoofing. If disabled, lwIP will need to
                    make a new ARP request if the peer is not already in the
                    ARP table, adding a little latency."
            }
        }

        cdl_component CYGPKG_LWIP_IP {
            display         "IP options"
            flavor          none
            no_define
            description     "
                Configuration options for IP protocol."
        
            cdl_option CYGFUN_LWIP_IP_FORWARD {
                display         "Support IP forwarding"
                flavor          bool
                default_value   0
                description     "
                    Enables the ability to forward IP packets across network
                    interfaces. If you are going to run lwIP on a device with
                    only one network interface, define this to 0."
            }
            
            cdl_option CYGFUN_LWIP_IP_OPTIONS_ALLOWED {
                display         "Allow IP options"
                flavor          bool
                default_value   1
                description     "
                    Defines the behavior for IP options:
                    0 = All packets with IP options are dropped.
                    1 = IP options are allowed (but not parsed)."
            }
    
            cdl_option CYGFUN_LWIP_IP_REASSEMBLY {
                display         "Support IP reassembly"
                flavor          bool
                default_value   1
                description     "
                    Reassemble incoming fragmented IP packets. Note that this
                    option does not affect outgoing packet sizes, which can be
                    controlled via CYGFUN_LWIP_IP_FRAG."
            }
            
            cdl_option CYGFUN_LWIP_IP_FRAG {
                display         "Support IP fragmentation"
                flavor          bool
                default_value   1
                description     "
                    Fragment outgoing IP packets if their size exceeds MTU.
                    Note that this option does not affect incoming packet
                    sizes, which can be controlled via
                    CYGFUN_LWIP_IP_REASSEMBLY."
            }
            
            cdl_option CYGNUM_LWIP_IP_REASS_MAXAGE {
                display         "Max reassembly time"
                flavor          data
                default_value   3
                description     "
                    Maximum time (in multiples of IP_TMR_INTERVAL - so seconds,
                    normally) a fragmented IP packet waits for all fragments to
                    arrive. If not all fragments arrived in this time, the
                    whole packet is discarded."
            }
            
            cdl_option CYGNUM_LWIP_IP_REASS_MAX_PBUFS {
                display         "Max reassembly time"
                flavor          data
                default_value   10
                requires        { CYGNUM_LWIP_PBUF_BOOL_SIZE <
                                  CYGNUM_LWIP_IP_REASS_MAX_PBUFS }
                description     "
                    Total maximum amount of pbufs waiting to be reassembled.
                    Since the received pbufs are enqueued, be sure to configure
                    CYGNUM_LWIP_PBUF_BOOL_SIZE > CYGNUM_LWIP_IP_REASS_MAX_PBUFS
                    so that the stack is still able to receive packets even if
                    the maximum amount of fragments is enqueued for reassembly!"
            }
            
            cdl_option CYGFUN_LWIP_IP_FRAG_USES_STATIC_BUF {
                display         "Use static buffer for IP fragmentation"
                flavor          bool
                default_value   1
                description     "
                    Use a static MTU-sized buffer for IP fragmentation.
                    Otherwise pbufs are allocated and reference the original
                    packet data to be fragmented."
            }
            
            cdl_option CYGNUM_LWIP_IP_FRAG_MAX_MTU {
                display         "Max MTU size"
                flavor          data
                default_value   1500
                active_if       { CYGFUN_LWIP_IP_FRAG_USES_STATIC_BUF }
                description     "
                    Assumed max MTU on any interface for IP frag buffer."
            }
            
            cdl_option CYGNUM_LWIP_IP_DEFAULT_TTL {
                display         "Default Time-To-Live"
                flavor          data
                default_value   255
                description     "
                    Default value for Time-To-Live used by transport layers."
            }
            
            cdl_component CYGFUN_LWIP_IP_SOF_BROADCAST {
                display         "Support broadcast filter"
                flavor          bool
                default_value   0
                description     "
                    Use the SOF_BROADCAST field to enable broadcast filter
                    per pcb on udp and raw send operations. To enable
                    broadcast filter on recv operations, you also have to set
                    IP_SOF_BROADCAST_RECV=1."
                    
                cdl_option CYGFUN_LWIP_IP_SOF_BROADCAST_RECV {
                    display         "Receive support"
                    flavor          bool
                    default_value   0
                    active_if       CYGFUN_LWIP_IP_SOF_BROADCAST
                    description     "
                        Enable the broadcast filter on recv operations."
                }
            }
        }
    
        cdl_component CYGPKG_LWIP_ICMP {
            display         "ICMP support"
            flavor          bool
            default_value   1
            description     "
                Support for ICMP functionality. Be careful, disabling this
                makes your product non-compliant to RFC1122."
    
            cdl_option CYGNUM_LWIP_ICMP_TTL {
                display         "ICMP Time-To-Live"
                flavor          data
                default_value   { CYGNUM_LWIP_IP_DEFAULT_TTL }
                description     "
                    Default value for Time-To-Live used by ICMP packets."
            }
            
            cdl_option CYGFUN_LWIP_BROADCAST_PING {
                display         "Respond broadcast pings"
                flavor          bool
                default_value   0
                description     "
                    Respond to broadcast pings (default is unicast only)."
            }
    
            cdl_option CYGFUN_LWIP_MULTICAST_PING {
                display         "Respond multicast pings"
                flavor          bool
                default_value   0
                description     "
                    Respond to multicast pings (default is unicast only)."
            }
        }
        
        cdl_component CYGPKG_LWIP_IGMP {
            display         "IGMP support"
            flavor          bool
            default_value   1
            description     "
                Support for IGMP functionality."
        }
            
        cdl_component CYGPKG_LWIP_UDP {
            display         "UDP support"
            flavor          bool
            default_value   1
            requires        CYGPKG_LWIP_IP
            description     "
                Support for UDP functionality."
                
            cdl_option CYGFUN_LWIP_UDPLITE {
                display         "UDP lite"
                flavor          bool
                default_value   1
                description     "
                    Enable UDP lite."
            }
            
            cdl_option CYGNUM_LWIP_UDP_TTL {
                display         "UDP Time-To-Live"
                flavor          data
                default_value   { CYGNUM_LWIP_IP_DEFAULT_TTL }
                description     "
                    Default value for Time-To-Live used by UDP packets."
            }
        }
        
        cdl_component CYGPKG_LWIP_TCP {
            display         "TCP support"
            flavor          bool
            default_value   1
            requires        CYGPKG_LWIP_IP
            description     "
                Support for TCP functionality."
                
            cdl_option CYGNUM_LWIP_TCP_TTL {
                display         "TCP Time-To-Live"
                flavor          data
                default_value   { CYGNUM_LWIP_IP_DEFAULT_TTL }
                description     "
                    Default value for Time-To-Live used by TCP packets."
            }
            
            cdl_option CYGNUM_LWIP_TCP_WND {
                display         "Receive window"
                flavor          data
                default_value   { CYGNUM_LWIP_TCP_MSS * 4 }
                requires        { CYGNUM_LWIP_TCP_WND >=
                                  CYGNUM_LWIP_TCP_MSS * 2 }
                description     "
                    The size of a TCP window. This must be at least
                    (2 * TCP_MSS) for things to work well."
            }
            
            cdl_option CYGNUM_LWIP_TCP_MAXRTX {
                display         "Segment retransmissions"
                flavor          data
                default_value   12
                description     "
                     Maximum number of retransmissions of data segments."
            }
            
            cdl_option CYGNUM_LWIP_TCP_SYNMAXRTX {
                display         "Syn retransmissions"
                flavor          data
                default_value   6
                description     "
                    Maximum number of retransmissions of SYN segments."
            }
            
            cdl_option CYGFUN_LWIP_TCP_QUEUE_OOSEQ {
                display         "Queue segments"
                flavor          bool
                default_value   1
                description     "
                    TCP will queue segments that arrive out of order. Define
                    to 0 if your device is low on memory."
            }
            
            cdl_option CYGNUM_LWIP_TCP_MSS {
                display         "Maximum segment size"
                flavor          data
                default_value   536
                description     "
                    TCP Maximum segment size. (default is 128, a *very*
                    conservative default.) For the receive side, this MSS is
                    advertised to the remote side when opening a connection.
                    For the transmit size, this MSS sets an upper limit on the
                    MSS advertised by the remote host."
            }
            
            cdl_option CYGFUN_LWIP_TCP_CALCULATE_EFF_SEND_MSS {
                display         "Calculate effective MSS"
                flavor          bool
                default_value   1
                description     "
                    \"The maximum size of a segment that TCP really sends, the
                    'effective send MSS,' MUST be the smaller of the send MSS
                    (which reflects the available reassembly buffer size at the
                    remote host) and the largest size permitted by the IP
                    layer\" (RFC 1122) Setting this to 1 enables code that
                    checks TCP_MSS against the MTU of the netif used for a
                    connection and limits the MSS if it would be too big
                    otherwise."            
            }
            
            cdl_option CYGNUM_LWIP_TCP_SND_BUF {
                display         "Sender buffer space"
                flavor          data
                default_value   CYGNUM_LWIP_TCP_SND_QUEUELEN * CYGNUM_LWIP_TCP_MSS / 4
                requires        { CYGNUM_LWIP_TCP_SND_BUF * 2 <
                                  CYGNUM_LWIP_TCP_SND_QUEUELEN * CYGNUM_LWIP_TCP_MSS }
                description     "
                    TCP sender buffer space (bytes)."
            }
            
            cdl_option CYGNUM_LWIP_TCP_SND_QUEUELEN {
                display         "Sender pbufs"
                flavor          data
                default_value   8
                description     "
                    TCP sender buffer space (pbufs). This must be at least as
                    much as (2 * TCP_SND_BUF/TCP_MSS) for things to work."
            }
            
            cdl_option CYGNUM_LWIP_TCP_SNDLOWAT {
                display         "TCP writeable space"
                flavor          data
                default_value   { CYGNUM_LWIP_TCP_SND_BUF / 2 }
                description     "
                    TCP writable space (bytes). This must be less than or equal
                    to TCP_SND_BUF. It is the amount of space which must be
                    available in the TCP snd_buf for select to return writable."
            }
            
            cdl_option CYGFUN_LWIP_TCP_LISTEN_BACKLOG {
                display         "Listen backlog"
                flavor          bool
                default_value   0
                description     "
                    Enable the backlog option for tcp listen pcb."
            }
            
            cdl_option CYGNUM_LWIP_TCP_DEFAULT_LISTEN_BACKLOG {
                display         "Maximum listen backlog"
                flavor          data
                active_if       { CYGFUN_LWIP_TCP_LISTEN_BACKLOG }
                default_value   255
                legal_values    { 1 to 255 }
                description     "
                    The maximum allowed backlog for TCP listen netconns."
            }
            
            cdl_option CYGFUN_LWIP_TCP_TIMESTAMPS {
                display         "TCP timestamp"
                flavor          bool
                default_value   0
                description     "
                    Support the TCP timestamp option."
            }
            
            cdl_option CYGNUM_LWIP_TCP_WND_UPDATE_THRESHOLD {
                display         "Update threshold"
                flavor          bool
                default_value   { CYGNUM_LWIP_TCP_WND / 4 }
                description     "
                    Difference in window to trigger an explicit window update."
            }
            
            cdl_option CYGFUN_LWIP_EVENT_API {
                display         "Event API"
                flavor          bool
                default_value   0
                requires        { !CYGFUN_LWIP_CALLBACK_API }
                description     "
                    The user defines lwip_tcp_event() to receive all events
                    (accept, sent, etc) that happen in the system."
            }
    
            cdl_option CYGFUN_LWIP_CALLBACK_API {
                display         "Callback API"
                flavor          bool
                default_value   1
                requires        { !CYGFUN_LWIP_EVENT_API }
                description     "
                    The PCB callback function is called directly for the event."
            }
        }   
            
        cdl_component CYGPKG_LWIP_DHCP {
            display         "DHCP support"
            flavor          bool
            default_value   1
            requires        CYGPKG_LWIP_UDP
            compile         core/dhcp.c
            description "
                Support for DHCP functionality."
                
            cdl_option CYGFUN_LWIP_DHCP_DOES_ARP_CHECK {
                display         "Check offered address"
                flavor          bool
                default_value   1
                requires        CYGPKG_LWIP_ARP
                description     "
                    Do an ARP check on the offered address."
            }
        }
        
        cdl_component CYGPKG_LWIP_AUTOIP {
            display         "AUTOIP support"
            flavor          bool
            default_value   0
            requires        CYGPKG_LWIP_UDP
            requires        CYGPKG_LWIP_ARP
            compile         core/ipv4/autoip.c
            description "
                Support for AUTOIP functionality."
                
            cdl_option CYGFUN_LWIP_DHCP_AUTOIP_COOP {
                display         "Simultaneous AUTOIP/DHCP"
                flavor          bool
                default_value   1
                requires        CYGPKG_LWIP_DHCP
                description     "
                    Allow DHCP and AUTOIP to be both enabled on the same
                    interface at the same time."
            }
            
            cdl_option CYGNUM_LWIP_DHCP_AUTOIP_COOP_TRIES {
                display         "DHCP retries before AUTOIP"
                flavor          data
                default_value   9
                legal_values    { 1 to 10000 }
                requires        CYGFUN_LWIP_DHCP_AUTOIP_COOP
                description     "
                    Set to the number of DHCP DISCOVER probes that should be
                    sent before falling back on AUTOIP. This can be set as low
                    as 1 to get an AutoIP address very quickly, but you should
                    be prepared to handle a changing IP address when DHCP
                    overrides AutoIP."
            }
        }
        
        cdl_component CYGPKG_LWIP_SNMP {
            display         "SNMP support"
            flavor          bool
            default_value   0
            requires        CYGPKG_LWIP_UDP
            compile         core/snmp/asn1_dec.c            \
                            core/snmp/asn1_enc.c            \
                            core/snmp/mib_structs.c         \
                            core/snmp/mib2.c                \
                            core/snmp/msg_in.c              \
                            core/snmp/msg_out.c
            description "
                Support for SNMP functionality."
    
            cdl_option CYGNUM_LWIP_SNMP_CONCURRENT_REQUESTS {
                display         "Concurrent requests"
                flavor          data
                default_value   1
                description     "
                    Number of concurrent requests the module will allow. At
                    least one request buffer is required." 
            }
                
            cdl_option CYGNUM_LWIP_SNMP_TRAP_DESTINATIONS {
                display         "Trap destinations"
                flavor          data
                default_value   1
                description     "
                    Number of trap destinations. At least one trap destination
                    is required."
            }
            
            cdl_option CYGFUN_LWIP_SNMP_PRIVATE_MIB {
                display         "Private MIB"
                flavor          bool
                default_value   0
                description     ""
            }
                
            cdl_option CYGFUN_LWIP_SNMP_SAFE_REQUESTS {
                display         "Safe requests"
                flavor          bool
                default_value   1
                description     "
                    Only allow SNMP write actions that are 'safe' (e.g.
                    disabling netifs is not a safe action and disabled when
                    SNMP_SAFE_REQUESTS = 1). Unsafe requests are disabled by
                    default!"
            }
        }
        
        cdl_component CYGPKG_LWIP_DNS {
            display         "DNS support"
            flavor          bool
            default_value   0
            requires        CYGPKG_LWIP_UDP
            description     "
                Support for DNS functionality."
    
            cdl_option CYGNUM_LWIP_DNS_TABLE_SIZE {
                display         "Table size"
                flavor          data
                default_value   4
                description     "
                    DNS maximum number of entries to maintain locally."
            }
                
            cdl_option CYGNUM_LWIP_DNS_MAX_NAME_LENGTH {
                display         "Host name size"
                flavor          data
                default_value   256
                description     "
                    DNS maximum host name length supported in the name table."
            }
            
            cdl_option CYGNUM_LWIP_DNS_MAX_SERVERS {
                display         "DNS servers"
                flavor          data
                default_value   2
                description     "
                    The maximum of DNS servers."
            }
            
            cdl_option CYGFUN_LWIP_DNS_DOES_NAME_CHECK {
                display         "Name checking"
                flavor          bool
                default_value   1
                description     "
                    DNS do a name checking between the query and the response."
            }
                
            cdl_option CYGNUM_LWIP_DNS_USES_STATIC_BUF {
                display         "Static buffer"
                flavor          data
                default_value   1
                legal_values    { 0 to 2 }
                description     "
                    DNS use a local buffer if DNS_USES_STATIC_BUF=0, a static
                    one if DNS_USES_STATIC_BUF=1, or a dynamic one if
                    DNS_USES_STATIC_BUF=2. The buffer will be of size
                    DNS_MSG_SIZE."
            }
            
            cdl_option CYGNUM_LWIP_DNS_MSG_SIZE {
                display         "Message size"
                flavor          data
                default_value   512
                description     "
                    DNS message max. size. Default value is RFC compliant."
            }
            
            cdl_component CYGPKG_LWIP_DNS_LOCAL_HOSTLIST {
                display         "Local host list"
                flavor          bool
                default_value   0
                description     "
                    Support for a local host-to-address list."
                    
                cdl_option CYGDAT_LWIP_DNS_LOCAL_HOSTLIST_INIT {
                    display         "Host list"
                    flavor          data
                    default_value   { "{{\"host1\", 0x123},\
                                        {\"host2\", 0x234}}" }
                    description     "
                        An array of structs name/address, where address is an
                        u32_t in network byte order."
                }
                
                cdl_option CYGFUN_LWIP_DNS_LOCAL_HOSTLIST_IS_DYNAMIC {
                    display         "Dynamic host list"
                    flavor          bool
                    default_value   1
                    description     "
                        If this is turned on, the local host-list can be
                        dynamically changed at runtime."
                }
            }
        }
    }
    
    cdl_component CYGPKG_LWIP_INTERFACES {
        display         "Interfaces"
        flavor          none
        no_define
        description     "
            Configuration options for support of different network interface
            devices."
            
        cdl_interface CYGPKG_LWIP_NETIF_DEFAULT {
            display         "Items claiming default network interface status"
            flavor          data
            no_define
            requires        { CYGPKG_LWIP_NETIF_DEFAULT <= 1 }
            description     "
                Items which claim that a specific networking interface should
                be the default interface should implement this CDL interface.
                Only one networking interface can claim default networking
                interface status."
        }
            
        cdl_component CYGPKG_LWIP_NETIF {
            display         "Netif options"
            flavor          none
            no_define
            description     "
                Configuration options for netif."
                
            cdl_option CYGIMP_LWIP_NETIF_HOSTNAME {
                display         "Hostname support"
                flavor          bool
                default_value   0
                description     "
                    Adds a 'hostname' field to the netif structure and enables
                    support for retrieving the hostname via DHCP."
            }
            
            cdl_option CYGFUN_LWIP_NETIF_STATUS_CALLBACK {
                display         "Status callback"
                flavor          bool
                default_value   1
                description     "
                    Support a callback function whenever an interface changes
                    its up/down status (i.e., due to DHCP IP acquistion)."
            }
            
            cdl_option CYGFUN_LWIP_NETIF_LINK_CALLBACK {
                display         "Link callback"
                flavor          bool
                default_value   0
                description     "
                    Support a callback function from an interface whenever the
                    link changes (i.e., link down)."
            }
            
            cdl_option CYGIMP_LWIP_NETIF_HWADDRHINT {
                display         "Cache link-layer-address hints"
                flavor          bool
                default_value   0
                description     "
                    Cache link-layer-address hints (e.g. table indices) in
                    struct netif. TCP and UDP can make use of this to prevent
                    scanning the ARP table for every sent packet. While this is
                    faster for big ARP tables or many concurrent connections,
                    it might be counterproductive if you have a tiny ARP table
                    or if there never are concurrent connections."
            }
            
            cdl_component CYGIMP_LWIP_NETIF_LOOPBACK {
                display         "Loopback support"
                flavor          bool
                default_value   0
                description     "
                    Support sending packets with a destination IP address equal
                    to the netif IP address, looping them back up the stack."
                    
                cdl_option CYGNUM_LWIP_NETIF_LOOPBACK_MAX_PBUFS {
                    display         "PBUF queue length"
                    flavor          data
                    default_value   0
                    description     "
                        Maximum number of pbufs on queue for loopback sending
                        for each netif (0 = disabled)."
                }
            }
        }

        cdl_component CYGPKG_LWIP_ETH {
            display         "Ethernet support"
            flavor          bool
            requires        CYGPKG_IO
            requires        CYGPKG_IO_ETH_DRIVERS
            requires        CYGPKG_LWIP_ARP
            default_value   CYGPKG_IO_ETH_DRIVERS
            description     "
                Support for ethernet devices"
                
            # Support static configuration of up to 4 interfaces
            for { set ::channel 0 } { $::channel < 4 } { incr ::channel } {
            
                cdl_component CYGPKG_LWIP_ETH[set ::channel]_CONF {
                    display         "eth[set ::channel] configuration"
                    flavor          bool
                    default_value   $::channel == 0
                    description     "
                        Static configuration of the ethernet device
                        eth[set ::channel]."

                    cdl_option CYGDAT_LWIP_ETH[set ::channel]_DEFAULT {
                        display         "Default netif"
                        flavor          bool
                        default_value   $::channel == 0
                        implements      CYGPKG_LWIP_NETIF_DEFAULT
                        description     "
                            Use this interface as the default network
                            interface."
                    }

                    cdl_option CYGDAT_LWIP_ETH[set ::channel]_DHCP {
                        display         "Use DHCP"
                        flavor          bool
                        default_value   $::channel == 0
                        requires        CYGPKG_LWIP_DHCP
                        description     "
                            Use DHCP to discover the IP address for this
                            interface."
                    }

                    cdl_component CYGPKG_LWIP_ETH[set ::channel]_NETCONF {
                        display         "Network configuration"
                        flavor          none
                        no_define
                        active_if       CYGDAT_LWIP_ETH[set ::channel]_DHCP == 0
                        description     "
                            See suboptions to define IP address, netmask and
                            gateway."

                        cdl_option CYGDAT_LWIP_ETH[set ::channel]_NETCONF_ADDR {
                            display         "Address"
                            flavor          data
                            default_value   { "192,168,1,222" }
                            description     "
                                The IP address of this device."
                        }

                        cdl_option CYGDAT_LWIP_ETH[set ::channel]_NETCONF_NETMASK {
                            display         "Netmask"
                            flavor          data
                            default_value   { "255,255,255,0" }
                            description     "
                                The netmask of the local network."
                        }
        
                        cdl_option CYGDAT_LWIP_ETH[set ::channel]_NETCONF_GATEWAY {
                            display         "Gateway"
                            flavor          data
                            default_value   { "192,168,1,1" }
                            description     "
                                The IP address of the gateway."
                        }
                    }
                }
            }
        }
        
        cdl_component CYGPKG_LWIP_LOOPIF {
            display         "Loop interface support"
            flavor          bool
            default_value   0
            compile         netif/loopif.c
            description     "
                Support loop interface."
                
            cdl_component CYGIMP_LWIP_LOOPIF_INSTANCE {
                display         "Default instance"
                flavor          bool
                default_value   1
                description     "
                    When enabled, a default loop interface is automatically
                    set up."
                    
                cdl_option CYGDAT_LWIP_LOOPIF_DEFAULT {
                    display         "Default netif"
                    flavor          bool
                    default_value   0
                    implements      CYGPKG_LWIP_NETIF_DEFAULT
                    description     "
                        Use this interface as the default network interface."
                }
                    
                cdl_option CYGDAT_LWIP_LOOPIF_ADDR {
                    display         "Address"
                    flavor          data
                    default_value   { "127,0,0,1" }
                    description     "
                        The IP address of this device."
                }
            
                cdl_option CYGDAT_LWIP_LOOPIF_NETMASK {
                    display         "Netmask"
                    flavor          data
                    default_value   { "255,255,255,0" }
                    description     "
                        The netmask of the local network."
                }
        
                cdl_option CYGDAT_LWIP_LOOPIF_GATEWAY {
                    display         "Gateway"
                    flavor          data
                    default_value   { "127,0,0,1" }
                    description     "
                        The IP address of the gateway."
                }
            }
        }

        cdl_component CYGPKG_LWIP_SLIP {
            display         "SLIP support"
            flavor          bool
            implements      CYGINT_LWIP_SIO_REQUIRED
            default_value   0
            compile         netif/slipif.c
            description     "
                Support SLIP functionality."
                
            cdl_option CYGDAT_LWIP_SLIPIF_DEV {
                display         "Serial device"
                flavor          data
                default_value   { "\"/dev/ser0\"" }
                description     "
                    Serial port to use for SLIP."
            }
            
            cdl_component CYGIMP_LWIP_SLIPIF_INSTANCE {
                display         "Default instance"
                flavor          bool
                default_value   1
                description     "
                    When enabled, a default loop interface is automatically
                    set up."
                    
                cdl_option CYGDAT_LWIP_SLIPIF_DEFAULT {
                    display         "Default netif"
                    flavor          bool
                    default_value   0
                    implements      CYGPKG_LWIP_NETIF_DEFAULT
                    description     "
                        Use this interface as the default network interface."
                }
            
                cdl_option CYGDAT_LWIP_SLIPIF_ADDR {
                    display         "Address"
                    flavor          data
                    default_value   { "172,16,1,1" }
                    description     "
                        The IP address of this device."
                }
            
                cdl_option CYGDAT_LWIP_SLIPIF_NETMASK {
                    display         "Netmask"
                    flavor          data
                    default_value   { "255,255,255,0" }
                    description     "
                        The netmask of the local network."
                }
        
                cdl_option CYGDAT_LWIP_SLIPIF_GATEWAY {
                    display         "Gateway"
                    flavor          data
                    default_value   { "172,16,1,2" }
                    description     "
                        The IP address of the gateway."
                }
            }
        }
        
        cdl_component CYGPKG_LWIP_PPP {
            display         "PPP support (experimental)"
            flavor          bool
            default_value   0
            compile         ecos/ppp.c          \
                            netif/ppp/auth.c    \
                            netif/ppp/chap.c    \
                            netif/ppp/chat.c    \
                            netif/ppp/chpms.c   \
                            netif/ppp/fsm.c     \
                            netif/ppp/ipcp.c    \
                            netif/ppp/lcp.c     \
                            netif/ppp/magic.c   \
                            netif/ppp/md5.c     \
                            netif/ppp/pap.c     \
                            netif/ppp/ppp_oe.c  \
                            netif/ppp/ppp.c     \
                            netif/ppp/randm.c   \
                            netif/ppp/record.c  \
                            netif/ppp/timesys.c \
                            netif/ppp/vj.c
            description     "
                Support PPP functionality. Current PPP support is marked
                experimental as it is subject to change for alignment to the
                PPP API of the upcoming lwIP 1.4.x releases."
    
            cdl_option CYGFUN_LWIP_PPPOE_SUPPORT {
                display         "PPPoE support"
                flavor          bool
                default_value   0
                description     "
                    Enable PPP Over Ethernet."
            }
                
            cdl_option CYGFUN_LWIP_PPPOS_SUPPORT {
                display         "PPPoS support"
                flavor          bool
                implements      CYGINT_LWIP_SIO_REQUIRED
                default_value   0
                description     "
                    Enable PPP Over Serial."
            }
            
            cdl_option CYGDAT_LWIP_PPPOS_DEV {
                display         "Serial device"
                flavor          data
                default_value   { "\"/dev/ser0\"" }
                active_if       { CYGFUN_LWIP_PPPOS_SUPPORT }
                description     "
                    Serial port to use for PPPoS."
            }
            
            cdl_option CYGNUM_LWIP_NUM_PPP {
                display         "Max sessions"
                flavor          data
                default_value   1
                description     "
                    Max PPP sessions."
            }
            
            cdl_option CYGFUN_LWIP_PAP_SUPPORT {
                display         "PAP support"
                flavor          bool
                default_value   0
                description     "
                    Enable PAP support."
            }
            
            cdl_option CYGFUN_LWIP_CHAP_SUPPORT {
                display         "CHAP support"
                flavor          bool
                default_value   0
                description     "
                    Enable CHAP support."
            }
            
            cdl_option CYGFUN_LWIP_VJ_SUPPORT {
                display         "VJ support"
                flavor          bool
                default_value   0
                description     "
                    Support VJ header compression."
            }
            
            cdl_option CYGFUN_LWIP_MD5_SUPPORT {
                display         "MD5 support"
                flavor          bool
                default_value   0
                description     "
                    Support MD5 (see also CHAP)."
            }
            
            cdl_option CYGFUN_LWIP_RECORD_SUPPORT {
                display         "Recording support"
                flavor          bool
                default_value   0
                description     "
                    Support for dumping incoming/outgoing records."
            }
        }
    }
    
    cdl_component CYGPKG_LWIP_MEM_OPTIONS {
        display         "Memory options"
        flavor          none
        no_define
        description     "
            Tunables for various aspects of memory usage throughout the stack."
            
        cdl_option CYGIMP_LWIP_MEM_LIBC_MALLOC {
            display         "Use malloc for internal allocations"
            flavor          bool
            default_value   0
            requires        { CYGINT_ISO_MEMALLOC != 0 }
            description     "
                Use malloc/free/realloc provided by the C-library instead of
                the lwip internal allocator. Can save code size if you already
                use it."
        }
                
        cdl_option CYGIMP_LWIP_MEMP_MEM_MALLOC {
            display         "Use malloc for pool allocations"
            flavor          bool
            default_value   0
            description     "
                Use mem_malloc/mem_free instead of the lwip pool allocator.
                Especially useful with MEM_LIBC_MALLOC but handle with care
                regarding execution speed and usage from interrupts!"
        }
                
        cdl_option CYGNUM_LWIP_MEM_ALIGNMENT {
            display         "Memory alignment"
            flavor          data
            default_value   4
            description     "
                Should be set to the alignment of the CPU."
        }
                
        cdl_option CYGNUM_LWIP_MEM_SIZE {
            display         "Memory size"
            flavor          data
            default_value   { 1600 + ((CYGNUM_LWIP_NUM_PPP * 2) * 1504) }
            description     "
                The size of the heap memory. If the application will send a lot
                of data that needs to be copied, this should be set high."
        }
        
        cdl_option CYGDBG_LWIP_MEMP_OVERFLOW_CHECK {
            display         "Memory pool overflow protection"
            flavor          data
            default_value   0
            description     "
                Memory pool overflow protection reserves a configurable amount
                of bytes before and after each memp element in every pool and
                fills it with a prominent default value.
                MEMP_OVERFLOW_CHECK == 0 no checking,
                MEMP_OVERFLOW_CHECK == 1 checks each element when it is freed,
                MEMP_OVERFLOW_CHECK >= 2 checks each element in every pool
                every time memp_malloc() or memp_free() is called
                (useful but slow!)"
        }
        
        cdl_option CYGDBG_LWIP_MEMP_SANITY_CHECK {
            display         "Memory pool sanity check"
            flavor          bool
            default_value   0
            description     "
                Run a sanity check after each memp_free() to make sure that
                there are no cycles in the linked lists."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_PBUF {
            display         "Number of memp struct pbufs"
            flavor          data
            default_value   16
            description     "
                 The number of memp struct pbufs (used for PBUF_ROM and
                 PBUF_REF). If the application sends a lot of data out of ROM
                 (or other static memory), this should be set high."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_TCP_PCB {
            display         "Simultaneous active TCP connections"
            flavor          data
            default_value   5
            active_if       { CYGPKG_LWIP_TCP }
            description     "
                The number of simulatenously active TCP connections."
        }
            
        cdl_option CYGNUM_LWIP_MEMP_NUM_TCP_PCB_LISTEN {
            display         "Listening TCP connections"
            flavor          data
            default_value   8
            active_if       { CYGPKG_LWIP_TCP }
            description     "
                The number of listening TCP connections."
        }
            
        cdl_option CYGNUM_LWIP_MEMP_NUM_TCP_SEG {
            display         "Simultaneous queued TCP segments"
            flavor          data
            default_value   16
            active_if       { CYGPKG_LWIP_TCP }
            description     "
                The number of simultaneously queued TCP segments."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_REASSDATA {
            display         "Simultaneous queued IP packets for reassembly"
            flavor          data
            default_value   5
            description     "
                The number of simultaneously IP packets queued for reassembly
                (whole packets, not fragments!)."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_ARP_QUEUE {
            display         "Simultaneous queued ARP requests"
            flavor          data
            default_value   30
            active_if       { CYGFUN_LWIP_ARP_QUEUEING }
            description     "
                The number of simulateously queued outgoing packets (pbufs)
                that are waiting for an ARP request (to resolve their
                destination address) to finish."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_IGMP_GROUP {
            display         "Multicast groups"
            flavor          data
            default_value   8
            active_if       { CYGPKG_LWIP_IGMP }
            description     "
                The number of multicast groups whose network interfaces can be
                members et the same time (one per netif - allsystems group -,
                plus one per netif membership)."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_CORE_SYS_TIMEOUT {
            display         "Simultaneous active timeouts by core modules"
            flavor          data
            calculated      { CYGPKG_LWIP_TCP + CYGFUN_LWIP_IP_REASSEMBLY +
                              CYGPKG_LWIP_ARP + (CYGPKG_LWIP_DHCP * 2) +
                              CYGPKG_LWIP_AUTOIP + CYGPKG_LWIP_IGMP +
                              CYGPKG_LWIP_DNS + CYGPKG_LWIP_PPP }
            description     "
                The number of simulateously active timeouts used by the lwIP
                core modules."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_USER_SYS_TIMEOUT {
            display         "Simultaneous active timeouts by user modules"
            flavor          data
            default_value   { 0 }
            description     "
                The number of simulateously active timeouts used by user
                modules."
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_NETBUF {
            display         "Struct netbufs"
            flavor          data
            default_value   2
            description     "
               The number of struct netbufs. (only needed if you use the
               sequential API, like api_lib.c)"
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_NETCONN {
            display         "Struct netconns"
            flavor          data
            default_value   4
            description     "
                The number of struct netconns. (only needed if you use the
                sequential API, like api_lib.c)"
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_TCPIP_MSG_API {
            display         "Struct tcpip_msg"
            flavor          data
            default_value   8
            description     "
                The number of struct tcpip_msg, which are used for
                callback/timeout API communication. (only needed if you use
                tcpip.c)"
        }
        
        cdl_option CYGNUM_LWIP_MEMP_NUM_TCPIP_MSG_INPKT {
            display         "Incoming struct tcpip_msg"
            flavor          data
            default_value   8
            description     "
                The number of struct tcpip_msg, which are used for incoming
                packets. (only needed if you use tcpip.c)"
        }
        
        cdl_option CYGNUM_LWIP_PBUF_POOL_SIZE {
            display         "Pbuf pool buffers"
            flavor          data
            default_value   16
            description     "
                The number of buffers in the pbuf pool."
        }

        cdl_option CYGNUM_LWIP_VARMEMPOOL_SIZE {
            display         "Size of variable memory pool"
            flavor          data
            default_value   2048
            description     "
                Memory required to hold semaphore, mbox and thread structures
                is allocated from this memory pool."
        }
        
        cdl_option CYGNUM_LWIP_PBUF_LINK_HLEN {
            display         "Allocation for a link level header"
            flavor          data
            default_value   { (CYGPKG_LWIP_ETH) ? 14 : 0 }
            requires        { CYGNUM_LWIP_PBUF_LINK_HLEN >= 
                              (CYGPKG_LWIP_ETH) ? 14 : 0 }
            description     "
                The number of bytes that should be allocated for a link level
                header. The default is 14, the standard value for Ethernet."
        }
        
        cdl_option CYGNUM_LWIP_PBUF_POOL_BUFSIZE {
            display         "PBUF buffer size"
            flavor          data
            default_value   { CYGNUM_LWIP_TCP_MSS + 40 + CYGNUM_LWIP_PBUF_LINK_HLEN }
            description     "
                The size of each pbuf in the pbuf pool. The default is designed
                to accomodate single full size TCP frame in one pbuf, including
                TCP_MSS, IP header, and link header."
        }       
    }
    
    cdl_component CYGPKG_LWIP_THREADS {
        display         "Thread options"
        flavor          none
        no_define
        active_if       CYGFUN_LWIP_MODE_SEQUENTIAL
        
        cdl_component CYGPKG_LWIP_THREAD_TCPIP {
            display         "TCP/IP thread"
            flavor          none
            no_define
            description     "
                The TCP/IP thread is handling the central message queue in the
                lwIP stack. The name is misleading, as it does not only handle
                TCP/IP, but all of the stack."

            cdl_option CYGNUM_LWIP_THREAD_TCPIP_STACKSIZE {
                display         "Stack size"
                flavor          data
                default_value   1024
            }
        
            cdl_option CYGNUM_LWIP_THREAD_TCPIP_PRIORITY {
                display         "Thread priority"
                flavor          data
                default_value   8
            }
        }
        
        cdl_component CYGPKG_LWIP_THREAD_ETH {
            display         "Ethernet thread"
            flavor          none
            no_define
            active_if       { CYGPKG_LWIP_ETH }
            description     "
                The ethernet thread is responsible for receiving data packets
                from ethernet devices and queueing them to be processed in the
                TCP/IP thread."

            cdl_option CYGNUM_LWIP_THREAD_ETH_STACKSIZE {
                display         "Stack size"
                flavor          data
                default_value   1024
            }
        
            cdl_option CYGNUM_LWIP_THREAD_ETH_PRIORITY {
                display         "Thread priority"
                flavor          data
                default_value   4
            }
        }
        
        cdl_component CYGPKG_LWIP_THREAD_SLIP {
            display         "SLIP thread"
            flavor          none
            no_define
            active_if       { CYGPKG_LWIP_SLIP }
            description     "
                The SLIP thread is responsible for reading data from the SLIP
                serial device and queue them to be processed in the TCP/IP
                thread."

            cdl_option CYGNUM_LWIP_THREAD_SLIP_STACKSIZE {
                display         "Stack size"
                flavor          data
                default_value   1024
            }
        
            cdl_option CYGNUM_LWIP_THREAD_SLIP_PRIORITY {
                display         "Thread priority"
                flavor          data
                default_value   8
            }
        }
        
        cdl_component CYGPKG_LWIP_THREAD_PPPOS {
            display         "PPPoS thread"
            flavor          none
            no_define
            active_if       { CYGFUN_LWIP_PPPOS_SUPPORT }
            description     "
                The PPPoS thread is responsible for reading data from the PPP
                serial device and queue them to be processed in the TCP/IP
                thread."

            cdl_option CYGNUM_LWIP_THREAD_PPPOS_STACKSIZE {
                display         "Stack size"
                flavor          data
                default_value   1024
            }
        
            cdl_option CYGNUM_LWIP_THREAD_PPPOS_PRIORITY {
                display         "Thread priority"
                flavor          data
                default_value   8
            }
        }
    }

    cdl_component CYGPKG_LWIP_CHECKSUMS {
        display         "Checksum generation/checking"
        flavor          none
        no_define
        description     "
            Options for checksum generation and checking."
            
        cdl_option CYGIMP_LWIP_CHECKSUM_GEN_IP {
            display         "Generate IP checksums"
            flavor          bool
            default_value   1
            description     "
                Generate checksums in software for outgoing IP packets."
        }
            
        cdl_option CYGIMP_LWIP_CHECKSUM_GEN_UDP {
            display         "Generate UDP checksums"
            flavor          bool
            default_value   1
            description     "
                Generate checksums in software for outgoing UDP packets."
        }
            
        cdl_option CYGIMP_LWIP_CHECKSUM_GEN_TCP {
            display         "Generate TCP checksums"
            flavor          bool
            default_value   1
            description     "
                Generate checksums in software for outgoing TCP packets."
        }

        cdl_option CYGIMP_LWIP_CHECKSUM_CHECK_IP {
            display         "Check IP checksums"
            flavor          bool
            default_value   1
            description     "
                Check checksums in software for incoming IP packets."
        }
            
        cdl_option CYGIMP_LWIP_CHECKSUM_CHECK_UDP {
            display         "Check UDP checksums"
            flavor          bool
            default_value   1
            description     "
                Check checksums in software for incoming UDP packets."
        }
            
        cdl_option CYGIMP_LWIP_CHECKSUM_CHECK_TCP {
            display         "Check TCP checksums"
            flavor          bool
            default_value   1
            description     "
                Check checksums in software for incoming TCP packets."
        }
    }
    
    cdl_component CYGPKG_LWIP_STATS {
        display         "Traffic statistics"
        flavor          bool
        default_value   0
        description     "
            Enable statistics collection in lwip_stats."
            
        cdl_option CYGVAR_LWIP_LINK_STATS {
            display         "Link stats"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGVAR_LWIP_ETHARP_STATS {
            display         "Etharp stats"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGVAR_LWIP_IP_STATS {
            display         "IP stats"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGVAR_LWIP_IPFARG_STATS {
            display         "IP fragmentation stats"
            flavor          bool
            default_value   1
            active_if       { CYGFUN_LWIP_IP_REASSEMBLY ||
                              CYGFUN_LWIP_IP_FRAG }
        }
        
        cdl_option CYGVAR_LWIP_ICMP_STATS {
            display         "ICMP stats"
            flavor          bool
            default_value   1
            active_if       { CYGPKG_LWIP_ICMP }
        }
        
        cdl_option CYGVAR_LWIP_IGMP_STATS {
            display         "IGMP stats"
            flavor          bool
            default_value   1
            active_if       { CYGPKG_LWIP_IGMP }
        }
        
        cdl_option CYGVAR_LWIP_UDP_STATS {
            display         "UDP stats"
            flavor          bool
            default_value   1
            active_if       { CYGPKG_LWIP_UDP }
        }
        
        cdl_option CYGVAR_LWIP_TCP_STATS {
            display         "TCP stats"
            flavor          bool
            default_value   1
            active_if       { CYGPKG_LWIP_TCP }
        }
        
        cdl_option CYGVAR_LWIP_MEM_STATS {
            display         "Memory stats"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGVAR_LWIP_MEMP_STATS {
            display         "Memory pool stats"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGVAR_LWIP_SYS_STATS {
            display         "System stats"
            flavor          bool
            default_value   1
        }
    }
    
    cdl_option CYGFUN_LWIP_SHOW_NETIF_CONFIG {
        display         "Show netif configuration"
        flavor          bool
        default_value   1
        requires        CYGFUN_LWIP_NETIF_STATUS_CALLBACK
        description     "
            Shows the netif configuration on the diagnostic output."
    }

    cdl_component CYGDBG_LWIP_DEBUG {
        display         "Debugging"
        flavor          bool
        default_value   0
        description     "
            Configuration options for debug output."
            
        cdl_component CYGDBG_LWIP_DEBUG_OPTIONS {
            display         "Debug options"
            flavor          none
            
            cdl_option CYGDBG_LWIP_DEBUG_LEVEL {
                display         "Log level"
                flavor          data
                default_value   0
                legal_values    { 0 to 3 }
                description     "
                    Sets the minimum log level needed to for log output.
                    0 = Info, 1 = Warning, 2 = Serious, 3 = Severe" 
            }
            
            cdl_option CYGDBG_LWIP_DEBUG_TRACE {
                display         "Trace messages"
                flavor          bool
                default_value   1
                description     "
                    Log state tracing messages (to follow module flow)." 
            }
            
            cdl_option CYGDBG_LWIP_DEBUG_STATE {
                display         "State messages"
                flavor          bool
                default_value   1
                description     "
                    Log state debug messages (to follow module states)." 
            }
            
            cdl_option CYGDBG_LWIP_DEBUG_FRESH {
                display         "Fresh messages"
                flavor          bool
                default_value   1
                description     "
                    Log messages from newly added code, not thoroughly tested
                    yet."
            }
        }
        
        cdl_option CYGDBG_LWIP_DEBUG_ETHARP {
            display         "Etharp debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_NETIF {
            display         "Netif debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_PBUF {
            display         "PBUF debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_API {
            display         "API debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_SOCKETS {
            display         "Sockets debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_ICMP {
            display         "ICMP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_IGMP {
            display         "IGMP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_IP {
            display         "IP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_RAW {
            display         "RAW debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_MEM {
            display         "Memory debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_SYS {
            display         "System debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_TCP {
            display         "TCP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_UDP {
            display         "UDP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_TCPIP {
            display         "TCPIP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_PPP {
            display         "PPP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_SLIP {
            display         "SLIP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_DHCP {
            display         "DHCP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_AUTOIP {
            display         "AUTOIP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_SNMP {
            display         "SNMP debugging"
            flavor          bool
            default_value   1
        }
                    
        cdl_option CYGDBG_LWIP_DEBUG_DNS {
            display         "DNS debugging"
            flavor          bool
            default_value   1
        }
        
        cdl_option CYGDBG_LWIP_DEBUG_SIO {
            display         "SIO debugging"
            flavor          bool
            default_value   1
        }
    }
    
    cdl_component CYGPKG_NET_LWIP_TESTS {
        display         "lwIP tests"
        flavor          data
        no_define
        calculated      { "tests/httpd_sequential tests/httpd_simple " .
                          "tests/nc_test_slave tests/ppp " . 
                          "tests/socket tests/sys_timeout tests/tcpecho " .
                          "tests/udpecho" }
        description     "
            This option specifies the set of tests for lwIP. They show the
            usage of the raw, the sequential and the BSD socket compatible APIs"
            
        cdl_component CYGPKG_NET_LWIP_PPP_TEST {
            display         "PPP test options"
            flavor          none
            no_define
            
            cdl_option CYGDAT_NET_LWIP_PPP_TEST_APN {
                display         "APN"
                flavor          data
                default_value   { "\"gprs.swisscom.ch\"" }
                description     "
                    Access Point Name used to open PPP connection."
            }
            
            cdl_option CYGDAT_NET_LWIP_PPP_TEST_NUMBER {
                display         "Number"
                flavor          data
                default_value   { "\"*99#\"" }
                description     "
                    Dial number used to open PPP connection."
            }
            
            cdl_option CYGDAT_NET_LWIP_PPP_TEST_USERNAME {
                display         "Username"
                flavor          data
                default_value   { "\"gprs\"" }
                description     "
                    Username used for PPP authentication."
            }
            
            cdl_option CYGDAT_NET_LWIP_PPP_TEST_PASSWORD {
                display         "Password"
                flavor          data
                default_value   { "\"gprs\"" }
                description     "
                    Password used for PPP authentication."
            }
            
            cdl_option CYGDAT_NET_LWIP_PPP_TEST_HOST {
                display         "Host to ping"
                flavor          data
                default_value   { "\"www.ping.ch\"" }
                description     "
                    Hostname for DNS resolve and ping."
            }
        }
    }

    cdl_component CYGPKG_NET_LWIP_OPTIONS {
        display         "lwIP build options"
        flavor          none
        no_define

        cdl_option CYGPKG_NET_LWIP_CFLAGS_ADD {
            display         "Additional compiler flags"
            flavor          data
            no_define
            default_value   { "" }
            description     "
                This option modifies the set of compiler flags for building the
                lwIP package. These flags are used in addition to the set of
                global flags."
        }

        cdl_option CYGPKG_NET_LWIP_CFLAGS_REMOVE {
            display         "Suppressed compiler flags"
            flavor          data
            no_define
            default_value   { "" }
            description     "
                This option modifies the set of compiler flags for building the
                lwIP package. These flags are removed from the set of global
                flags if present."
        }
    }
}