refine the backlog again
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Daniel Barlow
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1 changed files with 93 additions and 78 deletions
171
THOUGHTS.txt
171
THOUGHTS.txt
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@ -515,7 +515,7 @@ Sat Feb 11 14:37:45 GMT 2023
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Consolidated TODO
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* figure out persistent addresses for ethernet (?)
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* fix halt/reboot
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[SEEMS DONE] * fix halt/reboot
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[DONE, NO] * Kconfig.local do we still need it?
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[DONE] * check all config instead of differentiating config/checkedConfig
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@ -550,10 +550,10 @@ Things we probably do on hardware
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7) overlay with squashfs/ubifs - useful? think about workflows for
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how this thing is installed
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16) gl-ar750
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* decide how to hook up the gl-ar750 to the internets
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[DONE] * decide how to hook up the gl-ar750 to the internets
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17) mediatek device - gl-mt300 or whatever I have lying around
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18) some kind of arm (banana pi router?)
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19) should we give routeros a hardware ethernet and maybe an l2tp upstream,
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[DONE DIFERENTLY] 19) should we give routeros a hardware ethernet and maybe an l2tp upstream,
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then we could dogfood the hardware devices. we could run an l2tp service
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at mythic-beasts, got a /48 there
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@ -564,77 +564,7 @@ The reason we would like to run PPPoE instead of L2TP on the "rotuer" device is
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- closer to real world scenario
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- means no need to run dhcp client on the wan interface before we
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even get to start the l2tpd
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rotuer needs to talk to something (an "access concentrator") that
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speaks pppoe on a lan-adjacent machine, which then needs to put the
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packets into an l2tp tunnel
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c->s PADI (discovery initiation, broadcast)
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s->c PADO (discovery offer)
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c->s PADR (discovery request, unicast)
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s->c PADS (discovery confirmation, issues SESSION_ID)
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PADT sent at end
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once we have a session id we can send PPP packets. These are
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ethernet packets
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6 bytes dest_mac
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6 bytes src_mac
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2 bytes ether_type = 0x8864
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1 byte ver=1, type=1 (nybbles)
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1 bytes CODE = 0x00
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2 bytes sesion_id
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2 bytes length
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2 bytes PPP protocol = 0xc021
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... ppp payload ...
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pppoe server runs pppd using a pty. it gets input data from an ethernet
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device and communicates by sending packets out of that same device to
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a remote computer, so what is it doing with that pty? I assume stripping the
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ethernet headers and sending the ppp inside it onto pppd
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x2ltpd does the same, so can we hook the ptys together somehow?
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we can ask xl2tpd to open a session using its control socket, but it
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will (I assume) spawn a pppd, and what we would like to do is pass file
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descriptors to a pppd that already exists.
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xl2tpd has a preprocessor symbol PPPD to specify what it runs
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could we rp-pppoe will
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it gets data from an ethernet
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device with ppp , encapsulation crap and sends it to the pty, then
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ethernet device
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packet with encrap -> rp-pppoe -> pty -> pppd
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------
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what if we start from the "other end"? start a l2tp tunnel and session
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so that the peer starts sending ppp negotiation. When we get packets
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from the peer we will strip the encapsulation and send the inner ppp
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payload to pppd as a subprocess on a pty, which will decide how to
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respond. The reply is encapsulated and sent out on a port
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for rp-pppoe, the invocation is
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pppd pty 'pppoe [pppoe_options]' [pppd_options]
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i.e. it runs pppd and tells it to use a pppoe process as its pty.
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This process accepts ppp packets on stdin/stdout and encapsulates them
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for ethernet.
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So, can we use 'pppoe [pppoe_options]' as the pppd argument to xl2tp
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what do we need to test this?
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even get to start the l2tpd
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Sun Feb 12 14:57:28 GMT 2023
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@ -662,9 +592,94 @@ call it "borderNetVm" :
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(for consistency we should rename the "access" qemu socket network to
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match whatever we call this)
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nixos iso-image has a grub label
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# A variant to boot with a serial console enabled
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LABEL boot-serial
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rm border.qcow2 ; nix-shell --argstr liminix `pwd` --argstr nixpkgs `pwd`/../nixpkgs --argstr unstable `pwd`/../unstable-nixpkgs/ ci.nix -A buildEnv --run "run-border-vm"
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Wed Feb 15 22:56:59 GMT 2023
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configuration for border vm needs to come from somewhere so it's good
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for more people than just me
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- pci device for setting up the ethernet
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- lns address
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- uid so it can do 9p shares? do we need to map things here?
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also need to document the host-side bits so that people can set up
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their spare ethernet as vfio
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next step for hacking is to figure out what I was doing with pppoe
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Wed Feb 15 22:59:56 GMT 2023
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docs ...
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* introduction
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* user guide
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** how to build it
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** how to flash it on your device
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** what to put in configuration.nix
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** modules
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* developer guide
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** building/running with qemu
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*** emulated upstream
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** building/running on hardware
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*** run in place with TFTP
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*** emulated upstream
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** CI
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** Roadmap
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** Contributing
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rm border.qcow2 ; nix-shell --argstr liminix `pwd` --argstr nixpkgs `pwd`/../nixpkgs --argstr unstable `pwd`/../unstable-nixpkgs/ ci.nix -A buildEnv --run "sudo run-border-vm"
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nix-shell -p sphinx --run "make -C doc html"
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https://francis.begyn.be/blog/nixos-home-router contains information about avahi reflector
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Fri Feb 17 00:09:34 GMT 2023
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29 11.282085831 81.187.76.242 → 8.8.8.8 ICMP 106 Echo (ping) request id=0x0187, seq=2/512, 4
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30 11.286314642 90.155.53.19 → 81.187.76.242 ICMP 78 Destination unreachable (Communication admin)
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We're getting packets over the pppoe-l2tp relay thing. Just have to
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work out now why we're not routing
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Fri Feb 17 16:54:41 GMT 2023
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Haha. We weren't routing because we'd used the wrong CHAP password
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Fri Feb 17 16:58:27 GMT 2023
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This TODO is for nlnet task 1 and for bits of subsequent tasks that
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are annoying enough that I might poke at them anyway:
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1) gl-ar750, why do we get "ag71xx 19000000.eth: invalid MAC address, using random address"
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2) gl-ar750, wifi
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3) document services so I can remember how they work. Refer back to Oct 18 for notes that no longer make sense
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4) check out restart behaviour of dependent services when depended-on service dies
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5) pppd _creates_ an interface, work out how to fit it into this model
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6) add bridge support for lan
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7) upgrade ppp to something with an ipv6-up-script option, move ppp and pppoe derivations into their own files
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8) get ipv6 address from pppoe
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9) get ipv6 delegation from pppoe and add prefix to lan
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10) support dhcp6 in dnsmasq, and advertise prefix on lan
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11) firewalling and nat - default deny or zero trust?
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13) should we check that references to outputs actually correspond with
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14) make a flake?
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15) see if there are other tests that need adding to CI
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15a) is bordervm derivation tested?
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18) gl-mt300a
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19) gl-mt300n-v2
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12) write secrets holder as a service with outputs
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16) writable filesystem (ubifs?)
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17) overlay with squashfs/ubifs - useful? think about workflows for how this thing is installed
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I could plug tninkpad into the gl-ar750 LAN port to dogfood the wired
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networking
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