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2010-08-25T09:23:17
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\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: ip-output.fth
\
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
\
\ - Do no alter or remove copyright notices
\
\ - Redistribution and use of this software in source and binary forms, with
\ or without modification, are permitted provided that the following
\ conditions are met:
\
\ - Redistribution of source code must retain the above copyright notice,
\ this list of conditions and the following disclaimer.
\
\ - Redistribution in binary form must reproduce the above copyright notice,
\ this list of conditions and the following disclaimer in the
\ documentation and/or other materials provided with the distribution.
\
\ Neither the name of Sun Microsystems, Inc. or the names of contributors
\ may be used to endorse or promote products derived from this software
\ without specific prior written permission.
\
\ This software is provided "AS IS," without a warranty of any kind.
\ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
\ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
\ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
\ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
\ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
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\ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
\ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
\ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
\ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
\ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
\
\ You acknowledge that this software is not designed, licensed or
\ intended for use in the design, construction, operation or maintenance of
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\
\ ========== Copyright Header End ============================================
id: @(#)ip-output.fth 1.1 04/09/07
purpose: IP output routines
copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
headerless
\ Fill in the IP header checksum and send the packet.
: (ip-output) ( ippkt nexthop -- #sent )
swap 0 over >ip-cksum htonw! ( nexthop ippkt )
dup ip-checksum over >ip-cksum htonw! ( nexthop ippkt )
tuck swap arp-resolve if ( ippkt hwaddr )
over ip-len@ swap IP_TYPE if-output ( #sent )
else ( ippkt )
drop 0 ( 0 )
then ( #sent )
;
: ipf-copydata ( dgram fragoff fraglen fragpkt -- )
/ip-header ca+ swap >r >r /ip-header + ca+ r> r> move
;
\ Construct a fragment.
: ip-make-fragment ( dgram fragoff fraglen -- fragpkt )
pkt-alloc ?dup 0= if ( dgram offset len )
3drop 0 exit ( 0 )
then ( dgram offset len pkt )
3 pick over /ip-header move ( dgram offset len pkt )
over /ip-header + over ip-len! ( dgram offset len pkt )
2over 2over ipf-copydata ( dgram offset len pkt )
>r ( dgram offset len ) ( r: pkt )
over + rot ip-datalen@ <> if ( offset )
IP_MF ( offset ipf-flags )
else ( offset )
0 ( offset ipf-flags )
then ( offset ipf-flags )
swap 3 rshift or r@ >ip-fraginfo htonw! ( )
r> ( pkt ) ( r: )
;
\ Create and send a single fragment.
: ipf-send ( dgram fragoff fraglen nexthop -- #sent )
>r ip-make-fragment r> over if (ip-output) else 2drop 0 then
;
\ Transmit datagram, fragmenting it if necessary.
: ip-send-datagram ( dgram nexthop -- #sent )
over ip-len@ if-mtu@ <= if ( dgram nexthop )
(ip-output) ( #sent )
else ( dgram nexthop )
>r ( dgram ) ( r: nexthop )
0 begin ( dgram nsent )
over ip-datalen@ over - ( dgram nsent rem )
?dup while ( dgram nsent rem )
dup /ip-header + if-mtu@ > if ( dgram nsent rem )
drop if-mtu@ /ip-header - h# fff8 and ( dgram nsent fragsize )
then ( dgram nsent fragsize )
3dup r@ ipf-send 0= if ( dgram nsent fragsize )
r> 3drop pkt-free 0 exit ( 0 ) ( r: )
then ( dgram nsent fragsize )
+ ( dgram nsent' )
repeat ( dgram nsent' )
/ip-header + ( dgram #sent )
swap pkt-free ( #sent )
r> drop ( #sent ) ( r: )
then ( #sent )
;
instance variable ip-sequence
\ Determine next hop, complete the IP header and send the datagram. Most
\ of the fields in the IP header are initialized by the transport layer
\ protocol. Only the IP version, header length, datagram identifier and
\ the checksum are filled in here.
: ip-output ( ippkt -- #sent | error# )
dup >ip-dest ipdest>nexthop ?dup 0= if ( pkt )
pkt-free EHOSTUNREACH exit ( error# )
then swap ( nexthop pkt )
h# 45 over >ip-ver,hlen c!
ip-sequence @ over >ip-id htonw! 1 ip-sequence +!
0 over >ip-fraginfo htonw!
swap ip-send-datagram ( #sent )
;
headers