Branch
Hash :
1a08f436
Author :
Date :
2010-08-25T09:23:17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: icmp.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
\ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
\ 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
\ any nuclear facility.
\
\ ========== Copyright Header End ============================================
id: @(#)icmp.fth 1.1 04/09/07
purpose: ICMP support
copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
\ RFC 792: Internet Control Message Protocol
headerless
struct
/ip-header field >icmp-iphdr \ IP header, no options
/c field >icmp-type \ Message type
/c field >icmp-code \ Message type subcode
/w field >icmp-cksum \ Checksum
0 field >icmp-gwaddr \ Preferred gateway (ICMP_REDIRECT)
/w field >icmp-id \ Message id (ICMP_ECHO)
/w field >icmp-seq \ Sequence number (ICMP_ECHO)
0 field >icmp-ip \ IP header (ICMP_REDIRECT)
0 field >icmp-data \ Data (ICMP_ECHO)
constant /icmpip-header
\ ICMP message types
0 constant ICMP_ECHOREPLY \ Echo reply
d# 5 constant ICMP_REDIRECT \ Better route available
d# 8 constant ICMP_ECHO \ Echo request
\ Compute checksum on the ICMP (IP payload) packet
: icmp-checksum ( ip-pkt -- checksum )
0 swap ippkt>payload in-cksum
;
\ Fill in ICMP checksum and send the packet
: icmp-output ( ip-pkt -- )
0 over >icmp-cksum htonw! ( pkt )
dup icmp-checksum over >icmp-cksum htonw! ( pkt )
ip-output drop ( )
;
\ Handle an incoming ICMP redirect. Network redirects and host redirects
\ are treated identically.
: icmp-redirect ( ip-pkt -- )
dup >icmp-ip >ip-dest swap >icmp-gwaddr RT_HOST route-update
;
\ Respond to ICMP ECHO requests.
: icmp-reflect ( ip-pkt -- )
dup >ip-src over >ip-dest copy-ip-addr ( pkt )
my-ip-addr over >ip-src copy-ip-addr ( pkt )
ICMP_ECHOREPLY over >icmp-type c! ( pkt )
icmp-output ( )
;
\ Process incoming ICMP packet
: icmp-input ( pkt -- )
my-ip-addr inaddr-any? 0= if ( pkt )
dup icmp-checksum 0= if ( pkt )
dup >icmp-type c@ case
ICMP_ECHO of icmp-reflect exit endof
ICMP_REDIRECT of dup icmp-redirect endof
endcase
then ( pkt )
then ( pkt )
pkt-free ( )
;
['] icmp-input to (icmp-input)
headers