Track changes in gateway hwaddr
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39b19ba624
commit
d063b3b2fb
52
ip.rkt
52
ip.rkt
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@ -124,7 +124,7 @@
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(host-route-supply my-address netmask interface-name)))))
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(host-route-supply my-address netmask interface-name)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Gateway IP route
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;; General net route
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(define (spawn-net-route network-addr netmask link)
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(define (spawn-net-route network-addr netmask link)
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(cond
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(cond
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@ -135,16 +135,15 @@
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link)]
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link)]
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[else (error 'ip "Invalid net-route: ~v ~v ~v" network-addr netmask link)]))
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[else (error 'ip "Invalid net-route: ~v ~v ~v" network-addr netmask link)]))
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(define (spawn-gateway-ip-route network netmask gateway-addr)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(lookup-arp gateway-addr
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;; Gateway IP route
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?
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(net-route-supply network netmask gateway-addr)
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(lambda (interface gateway-hwaddr)
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(spawn-gateway-ip-route* network netmask gateway-addr interface gateway-hwaddr))))
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(define (spawn-gateway-ip-route* network netmask gateway-addr interface gateway-hwaddr)
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(struct gateway-route-state (routes gateway-interface gateway-hwaddr) #:transparent)
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(define (spawn-gateway-ip-route network netmask gateway-addr)
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(define host-route-projector (project-subs (host-route (?!) ? ?)))
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(define host-route-projector (project-subs (host-route (?!) ? ?)))
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(define net-route-projector (project-subs (net-route (?!) (?!) ?)))
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(define net-route-projector (project-subs (net-route (?!) (?!) ?)))
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(define gateway-arp-projector (project-pubs (arp-query IPv4-ethertype gateway-addr (?!) (?!))))
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(define (covered-by-some-other-route? addr routes)
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(define (covered-by-some-other-route? addr routes)
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(for/or ([r (in-set routes)])
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(for/or ([r (in-set routes)])
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@ -152,34 +151,49 @@
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(and (positive? msk)
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(and (positive? msk)
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(ip-address-in-subnet? addr net msk))))
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(ip-address-in-subnet? addr net msk))))
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(spawn (lambda (e routes)
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(spawn (lambda (e s)
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(match e
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(match e
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[(routing-update g)
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[(routing-update g)
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(define host-ips (gestalt-project/single g host-route-projector))
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(define host-ips (gestalt-project/single g host-route-projector))
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(define net-ips+netmasks (gestalt-project/keys g net-route-projector))
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(define net-ips+netmasks (gestalt-project/keys g net-route-projector))
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(transition (set-union (for/set ([ip host-ips]) (list ip 32)) net-ips+netmasks)
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(define gw-ip+hwaddr (let ((vs (gestalt-project/keys g gateway-arp-projector)))
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(and vs (not (set-empty? vs)) (set-first vs))))
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(transition (gateway-route-state
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(set-union (for/set ([ip host-ips]) (list ip 32)) net-ips+netmasks)
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(and gw-ip+hwaddr (car gw-ip+hwaddr))
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(and gw-ip+hwaddr (cadr gw-ip+hwaddr)))
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(when (gestalt-empty? (gestalt-filter g (net-route-supply network
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(when (gestalt-empty? (gestalt-filter g (net-route-supply network
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netmask
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netmask
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gateway-addr)))
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gateway-addr)))
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(quit)))]
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(quit)))]
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[(message (? ip-packet? p) _ _)
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[(message (? ip-packet? p) _ _)
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(and (not (equal? (ip-packet-source-interface p) (ethernet-interface-name interface)))
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(define gw-if (gateway-route-state-gateway-interface s))
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(not (covered-by-some-other-route? (ip-packet-destination p) routes))
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(when (not gw-if)
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(transition routes
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(log-warning "Gateway hwaddr for ~a not known, packet dropped"
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(send (ethernet-packet interface
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(ip-address->hostname gateway-addr)))
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(and gw-if
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(not (equal? (ip-packet-source-interface p) (ethernet-interface-name gw-if)))
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(not (covered-by-some-other-route? (ip-packet-destination p)
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(gateway-route-state-routes s)))
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(transition s
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(send (ethernet-packet gw-if
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#f
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#f
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(ethernet-interface-hwaddr interface)
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(ethernet-interface-hwaddr gw-if)
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gateway-hwaddr
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(gateway-route-state-gateway-hwaddr s)
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IPv4-ethertype
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IPv4-ethertype
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(format-ip-packet p)))))]
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(format-ip-packet p)))))]
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[_ #f]))
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[_ #f]))
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(set)
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(gateway-route-state (set) #f #f)
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(gestalt-union (if (zero? netmask)
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(gestalt-union (if (zero? netmask)
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(net-route-supply network netmask gateway-addr)
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(net-route-supply network netmask gateway-addr)
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(gestalt-empty))
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(gestalt-empty))
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observe-local-ip-addresses-gestalt
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(sub (ip-packet ? ? ? ? ? ?))
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(sub (ip-packet ? ? ? ? ? ?))
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(pub (ip-packet ? ? ? ? ? ?)))))
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(pub (ip-packet ? ? ? ? ? ?))
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observe-local-ip-addresses-gestalt
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(sub (net-route ? ? ?) #:level 2)
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(projection->gestalt gateway-arp-projector))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Normal IP route
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;; Normal IP route
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