Be more explicit about gateway routes having specific interfaces, to avoid ARP reqs on the wrong interface.
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parent
93b1b0fcf3
commit
ea9660d83d
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@ -2,14 +2,16 @@
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(provide (struct-out ethernet-interface)
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(struct-out host-route)
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(struct-out gateway-route)
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(struct-out net-route))
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(struct ethernet-interface (name hwaddr) #:prefab)
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;; A Route is one of
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;; - (host-route IpAddrBytes NetmaskNat InterfaceName), an own-IP route
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;; - (net-route NetAddrBytes NetmaskNat IpAddrBytes), a gateway route for a subnet
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;; - (gateway-route NetAddrBytes NetmaskNat IpAddrBytes InterfaceName), a gateway for a subnet
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;; - (net-route NetAddrBytes NetmaskNat InterfaceName), an ethernet route for a subnet
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;; NetmaskNat in a net-route is a default route.
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(struct host-route (ip-addr netmask interface-name) #:prefab)
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(struct gateway-route (network-addr netmask gateway-addr interface-name) #:prefab)
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(struct net-route (network-addr netmask link) #:prefab)
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61
ip.rkt
61
ip.rkt
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@ -64,6 +64,9 @@
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(spawn-demand-matcher (host-route (?!) (?!) (?!))
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#:supply-level 1
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spawn-host-route)
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(spawn-demand-matcher (gateway-route (?!) (?!) (?!) (?!))
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#:supply-level 1
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spawn-gateway-route)
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(spawn-demand-matcher (net-route (?!) (?!) (?!))
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#:supply-level 1
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spawn-net-route)))
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@ -71,6 +74,9 @@
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(define (host-route-supply ip-addr netmask interface-name)
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(sub (host-route ip-addr netmask interface-name) #:level 1))
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(define (gateway-route-supply network-addr netmask gateway-addr interface-name)
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(sub (gateway-route network-addr netmask gateway-addr interface-name) #:level 1))
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(define (net-route-supply network-addr netmask link)
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(sub (net-route network-addr netmask link) #:level 1))
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@ -123,27 +129,21 @@
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(pub (arp-assertion IPv4-ethertype my-address interface-name))
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(host-route-supply my-address netmask interface-name)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; General net route
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(define (spawn-net-route network-addr netmask link)
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(cond
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[(bytes? link) (spawn-gateway-ip-route network-addr netmask link)]
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[(string? link) (spawn-normal-ip-route (net-route-supply network-addr netmask link)
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network-addr
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netmask
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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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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Gateway IP route
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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 (spawn-gateway-route network netmask gateway-addr interface-name)
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(define gestalt-for-supply (gateway-route-supply network netmask gateway-addr interface-name))
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(define host-route-projector (project-subs (host-route (?!) ? ?)))
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(define gateway-route-projector (project-subs (gateway-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 gateway-arp-projector (project-pubs (arp-query IPv4-ethertype
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gateway-addr
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(?! (ethernet-interface interface-name ?))
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(?!))))
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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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@ -155,22 +155,28 @@
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(match e
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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 net-ips+netmasks (gestalt-project/keys g net-route-projector))
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(define gw-nets+netmasks (gestalt-project/keys g gateway-route-projector))
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(define net-nets+netmasks (gestalt-project/keys g net-route-projector))
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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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(when (and gw-ip+hwaddr (not (gateway-route-state-gateway-hwaddr s)))
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(log-info "Discovered gateway ~a at ~a on interface ~a."
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(ip-address->hostname gateway-addr)
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(ethernet-interface-name (car gw-ip+hwaddr))
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(pretty-bytes (cadr gw-ip+hwaddr))))
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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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(set-union (for/set ([ip host-ips]) (list ip 32))
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gw-nets+netmasks
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net-nets+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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netmask
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gateway-addr)))
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(quit)))]
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(when (gestalt-empty? (gestalt-filter g gestalt-for-supply)) (quit)))]
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[(message (? ip-packet? p) _ _)
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(define gw-if (gateway-route-state-gateway-interface s))
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(when (not gw-if)
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(log-warning "Gateway hwaddr for ~a not known, packet dropped"
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(ip-address->hostname gateway-addr)))
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(log-warning "Gateway hwaddr for ~a not known, packet dropped: ~v"
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(ip-address->hostname gateway-addr)
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p))
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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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@ -184,17 +190,22 @@
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(format-ip-packet p)))))]
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[_ #f]))
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(gateway-route-state (set) #f #f)
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(gestalt-union (if (zero? netmask)
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(net-route-supply network netmask gateway-addr)
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(gestalt-empty))
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(gestalt-union gestalt-for-supply
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(sub (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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(sub (gateway-route ? ? ? ?) #:level 2)
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(projection->gestalt gateway-arp-projector))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; General net route
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(define (spawn-net-route network-addr netmask link)
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(spawn-normal-ip-route (net-route-supply network-addr netmask link) network-addr netmask link))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Normal IP route
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4
main.rkt
4
main.rkt
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@ -23,12 +23,12 @@
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(void)
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(match (gethostname)
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["hop"
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(gestalt-union (pub (net-route (bytes 0 0 0 0) 0 (bytes 192 168 1 1)))
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(gestalt-union (pub (gateway-route (bytes 0 0 0 0) 0 (bytes 192 168 1 1) "wlan0"))
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(pub (host-route (bytes 192 168 1 222) 24 "wlan0")))]
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["stockholm.ccs.neu.edu"
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(gestalt-union (pub (host-route (bytes 129 10 115 94) 24 "eth0"))
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(pub (host-route (bytes 192 168 56 222) 24 "vboxnet0"))
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(pub (net-route (bytes 0 0 0 0) 0 (bytes 129 10 115 1))))]
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(pub (gateway-route (bytes 0 0 0 0) 0 (bytes 129 10 115 1) "eth0")))]
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[else
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(error 'stack-configuration "No setup for hostname ~a" (gethostname))]))
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