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\ Hypervisor Software File: arp.fth
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id: @(#)arp.fth 2.16 02/08/22
purpose: Address Resolution Protocol (ARP) and Reverse ARP (RARP)
copyright: Copyright 1990-2002 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
\ Address Resolution Protocol (ARP)
\ Given the local Ethernet address, finds a server's Ethernet address
\ Reverse Address Resolution Protocol (RARP)
\ Given the local Ethernet address, finds corresponding Internet address
\ These protocols are specific to both Ethernet and Internet, since
\ their purpose is to relate corresponding addresses from the two
h# 8035 constant RARP_TYPE
\ Request structure shared between ARP and RARP
2 field >arp-hw \ set to 1 for ethernet
2 field >arp-protocol \ set to IP_TYPE
1 field >arp-hwlen \ set to 6 for ethernet
1 field >arp-protolen \ set to 4 for IP
2 field >arp-opcode \ 1 arp req., 2 arp reply, 3 rarp req., 4 rarp reply
6 field >arp-sha \ sender hardware address
4 field >arp-spa \ sender protocol address
6 field >arp-tha \ target hardware address
4 field >arp-tpa \ target protocol address
: arp-hw ( -- adr ) active-struct@ >arp-hw ;
: arp-protocol ( -- adr ) active-struct@ >arp-protocol ;
: arp-hwlen ( -- adr ) active-struct@ >arp-hwlen ;
: arp-protolen ( -- adr ) active-struct@ >arp-protolen ;
: arp-opcode ( -- adr ) active-struct@ >arp-opcode ;
: arp-sha ( -- adr ) active-struct@ >arp-sha ;
: arp-spa ( -- adr ) active-struct@ >arp-spa ;
: arp-tha ( -- adr ) active-struct@ >arp-tha ;
: arp-tpa ( -- adr ) active-struct@ >arp-tpa ;
/ether-header /arp-packet + constant /ether+arp
\ Initial timeout for ARP/RARP packets set to 1 second
d# 1000 instance value arp-timeout-msecs
\ Common ARP/RARP request packet constructor
: send-arp/rarp-packet ( target-ip target-en my-ip my-en req-type en-type -- ok? )
*buffer @ active-struct ! \ Set the Ethernet header
my-en-addr en-source-addr 6 cmove
broadcast-en-addr en-dest-addr 6 cmove
( ... en-type ) en-type be-w!
/ether-header active-struct +! \ Set the ARP/RARP protocol packet
IP_TYPE arp-protocol be-w!
( ... req-type ) arp-opcode be-w!
( ... my-en-addr ) arp-sha 6 cmove
( ... my-ip-addr ) arp-spa 4 cmove
( ... target-en ) arp-tha 6 cmove
( target-ip ) arp-tpa 4 cmove
instance variable arp-timeout
\ Use exponential backoff (with maximum timeout of 32 seconds) between retries
: arp-backoff ( -- ) arp-timeout @ 2* d# 32000 min arp-timeout ! ;
: arpcom ( target-ip target-en my-ip my-en req-type en-type -- ok? )
send-arp/rarp-packet dup 0= if
." ARP/RARP send failed. Check Ethernet cable and transceiver." cr
arp-timeout @ set-timeout
: decode-arp-packet ( -- )
arp-sha his-en-addr 6 cmove \ grab his ethernet address
: .arp/rarp-timeout ( -- )
." Timeout waiting for ARP/RARP packet" cr
his-ip-addr his-en-addr my-ip-addr my-en-addr ARP_REQ ARP_TYPE
ARP_TYPE receive-ethernet-packet 0<>
/ether-header + active-struct !
arp-tpa my-ip-addr ip= if \ Addressed to me
arp-opcode be-w@ ARP_REPLY = if \ ARP reply
.arp/rarp-timeout arp-backoff
arp-timeout-msecs arp-timeout !
begin his-en-addr broadcast-en-addr? while try-arp repeat
\ Handle incoming arp packets if we know our address
: arp-response ( adr len -- )
/ether+arp < if drop exit then \ Packet length filter
en-type be-w@ ARP_TYPE <> if exit then \ Packet type filter
/ether-header active-struct +! \ Select ARP structure
arp-protocol be-w@ IP_TYPE <> if exit then \ Type filter
\ sunmon code locks onto his Ethernet address here, but I don't
\ think that is necessary, because we should only be ARP'ed if we
\ haven't already found the correct IP address.
arp-opcode be-w@ ARP_REQ <> if exit then \ Type filter
arp-tpa my-ip-addr ip= 0= if exit then \ For somebody else?
\ All the checks have succeeded, so we can send the reply
ARP_REPLY arp-opcode be-w!
/ether-header negate active-struct +!
my-en-addr en-source-addr 6 cmove
/ether-header active-struct +!
my-en-addr arp-sha 6 cmove ( adr )
my-ip-addr arp-spa 4 cmove
active-struct@ /ether-header - /ether+arp " write" $call-parent drop
' arp-response is handle-broadcast-packet
: decode-rarp-packet ( -- )
arp-tpa my-ip-addr 4 cmove \ grab my IP address
arp-spa his-ip-addr 4 cmove \ grab his IP address
arp-sha his-en-addr 6 cmove \ grab his ethernet address
broadcast-ip-addr my-en-addr my-ip-addr my-en-addr RARP_REQ RARP_TYPE
RARP_TYPE receive-ethernet-packet 0<>
/ether-header + active-struct !
arp-tha my-en-addr 6 comp 0= \ Addressed to me
arp-opcode be-w@ RARP_REPLY = and if \ RARP reply
.arp/rarp-timeout arp-backoff
arp-timeout-msecs arp-timeout !
begin my-ip-addr l@ 0= while try-rarp repeat
projects / OpenSPARC-T2-SAM / blob