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make a serviceDefn for wwan

This commit is contained in:
Daniel Barlow 2024-05-15 17:36:16 +01:00
parent fa0f262706
commit 898958fa10
3 changed files with 66 additions and 40 deletions
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7
examples/l2tp.nix
View File

@ -31,6 +31,13 @@ in rec {
];
hostname = "thing";
services.wwan = svc.wwan.build {
apn = "data.uk";
username = "user";
password = "one2one";
authType = "chap";
};
services.dhcpc = svc.network.dhcp.client.build {
interface = config.services.wwan;
dependencies = [ config.services.hostname ];

52
modules/cdc-ncm/default.nix
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@ -1,8 +1,14 @@
{ config, pkgs, lib, ... }:
let
inherit (pkgs.liminix.services) oneshot;
inherit (pkgs) liminix;
inherit (lib) mkOption types;
svc = config.system.service;
in {
options = {
system.service.wwan = mkOption {
type = liminix.lib.types.serviceDefn;
};
};
config = {
kernel.config = {
USB_NET_HUAWEI_CDC_NCM = "y";
@ -12,45 +18,11 @@ in {
};
# https://www.0xf8.org/2017/01/flashing-a-huawei-e3372h-4g-lte-stick-from-hilink-to-stick-mode/
services.wwan = let
chat = lib.escapeShellArgs [
# Your usb modem thing might present as a tty that you run PPP
# over, or as a network device ("ndis" or "ncm"). The latter
# kind is to be preferred, at least in principle, because it's
# faster. This initialization sequence works for the Huawei
# E3372, and took much swearing: the error messages are *awful*
"" "AT"
"OK" "ATZ"
# create PDP context
"OK" "AT+CGDCONT=1,\"IP\",\"data.uk\""
# activate PDP context
"OK" "AT+CGACT=1,1"
# setup username and password per requirements of sim provider.
# (caret is special to chat, so needs escaping in AT commands)
"OK" "AT\\^AUTHDATA=1,2,\"1p\",\"one2one\",\"user\""
# start the thing (I am choosing to read this as "NDIS DialUP")
"OK" "AT\\^NDISDUP=1,1"
];
modemConfig = oneshot {
name = "modem-configure";
# this is currently only going to work if there is one
# modem only plugged in, it is plugged in already at boot,
# and nothing else is providing a USB tty.
# https://stackoverflow.com/questions/5477882/how-to-i-detect-whether-a-tty-belonging-to-a-gsm-3g-modem-is-a-data-or-control-p
up = ''
sleep 2
${pkgs.usb-modeswitch}/bin/usb_modeswitch -v 12d1 -p 14fe --huawei-new-mode
sleep 5
${pkgs.ppp}/bin/chat -s -v ${chat} 0<>/dev/ttyUSB0 1>&0
'';
down = "chat -v '' ATZ OK </dev/ttyUSB0 >&0";
};
in svc.network.link.build {
ifname = "wwan0";
dependencies = [ modemConfig ];
system.service.wwan = config.system.callService ./wwan.nix {
apn = mkOption { type = types.str; };
username = mkOption { type = types.str; };
password = mkOption { type = types.str; };
authType = mkOption { type = types.enum [ "pap" "chap" ]; };
};
};
}

47
modules/cdc-ncm/wwan.nix Normal file
View File

@ -0,0 +1,47 @@
{
liminix
, usb-modeswitch
, ppp
, lib
, svc
}:
{ apn, username, password, authType }:
let
inherit (liminix.services) oneshot;
authTypeNum = if authType == "pap" then "1" else "2";
chat = lib.escapeShellArgs [
# Your usb modem thing might present as a tty that you run PPP
# over, or as a network device ("ndis" or "ncm"). The latter
# kind is to be preferred, at least in principle, because it's
# faster. This initialization sequence works for the Huawei
# E3372, and took much swearing: the error messages are *awful*
"" "AT"
"OK" "ATZ"
# create PDP context
"OK" "AT+CGDCONT=1,\"IP\",\"${apn}\""
# activate PDP context
"OK" "AT+CGACT=1,1"
# setup username and password per requirements of sim provider.
# (caret is special to chat, so needs escaping in AT commands)
"OK" "AT\\^AUTHDATA=1,${authTypeNum},\"\",\"${password}\",\"${username}\""
# start the thing (I am choosing to read this as "NDIS DialUP")
"OK" "AT\\^NDISDUP=1,1"
];
modemConfig = oneshot {
name = "modem-configure";
# this is currently only going to work if there is one
# modem only plugged in, it is plugged in already at boot,
# and nothing else is providing a USB tty.
# https://stackoverflow.com/questions/5477882/how-to-i-detect-whether-a-tty-belonging-to-a-gsm-3g-modem-is-a-data-or-control-p
up = ''
sleep 2
${usb-modeswitch}/bin/usb_modeswitch -v 12d1 -p 14fe --huawei-new-mode
sleep 5
${ppp}/bin/chat -s -v ${chat} 0<>/dev/ttyUSB0 1>&0
'';
down = "chat -v '' ATZ OK </dev/ttyUSB0 >&0";
};
in svc.network.link.build {
ifname = "wwan0";
dependencies = [ modemConfig ];
}