make a module for vlan

Acked-by: Daniel Barlow <<dan@telent.net>>
doc-do-over
Daniel Barlow 2023-08-30 23:26:44 +01:00
parent efa1919e04
commit 333327be75
5 changed files with 90 additions and 51 deletions

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@ -115,6 +115,7 @@
NET_RALINK_MDIO = "y";
NET_RALINK_MDIO_MT7620 = "y";
NET_RALINK_MT7620 = "y";
SWPHY = "y";
SPI = "y";
MTD_SPI_NOR = "y";
@ -123,14 +124,6 @@
SPI_MASTER= "y";
SPI_MEM= "y";
# both the ethernet ports on this device (lan and wan)
# are behind a switch, so we need VLANs to do anything
# useful with them
VLAN_8021Q = "y";
SWCONFIG = "y";
SWPHY = "y";
MTD = "y";
MTD_CMDLINE_PARTS = "y";
MTD_BLOCK = "y"; # fix undefined ref to register_mtd_blktrans_devs

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@ -52,44 +52,40 @@
"${openwrt.src}/target/linux/ramips/dts"
];
};
networkInterfaces = rec {
# lan and wan ports are both behind a switch on eth0
eth =
let swconfig = oneshot {
name = "swconfig";
up = ''
PATH=${pkgs.swconfig}/bin:$PATH
swconfig dev switch0 set reset
swconfig dev switch0 set enable_vlan 1
swconfig dev switch0 vlan 1 set ports '1 2 3 4 6t'
swconfig dev switch0 vlan 2 set ports '0 6t'
swconfig dev switch0 set apply
'';
down = "swconfig dev switch0 set reset";
};
in interface {
device = "eth0";
dependencies = [swconfig];
networkInterfaces =
let
inherit (config.system.service.network) link;
inherit (config.system.service) vlan;
swconfig = oneshot {
name = "swconfig";
up = ''
PATH=${pkgs.swconfig}/bin:$PATH
swconfig dev switch0 set reset
swconfig dev switch0 set enable_vlan 1
swconfig dev switch0 vlan 1 set ports '1 2 3 4 6t'
swconfig dev switch0 vlan 2 set ports '0 6t'
swconfig dev switch0 set apply
'';
down = "swconfig dev switch0 set reset";
};
in rec {
eth = link.build { ifname = "eth0"; dependencies = [swconfig]; };
# lan and wan ports are both behind a switch on eth0
lan = vlan.build {
ifname = "eth0.1";
primary = eth;
vid = "1";
};
wan = vlan.build {
ifname = "eth0.2";
primary = eth;
vid = "2";
};
wlan = link.build {
ifname = "wlan0";
dependencies = [ mac80211 ];
};
lan = interface {
type = "vlan";
device = "eth0.1";
link = "eth0";
id = "1";
dependencies = [eth];
};
wan = interface {
type = "vlan";
device = "eth0.2";
id = "2";
link = "eth0";
dependencies = [eth];
};
wlan = interface {
device = "wlan0";
dependencies = [ mac80211 ];
};
};
};
boot.tftp = {
# 20MB seems to give enough room to uncompress the kernel
@ -148,13 +144,6 @@
NET_VENDOR_RALINK = "y";
NET_RALINK_RT3050 = "y";
NET_RALINK_SOC="y";
# both the ethernet ports on this device (lan and wan)
# are behind a switch, so we need VLANs to do anything
# useful with them
VLAN_8021Q = "y";
SWCONFIG = "y";
SWPHY = "y";
WATCHDOG = "y";

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@ -31,6 +31,7 @@ in rec {
../modules/standard.nix
../modules/wlan.nix
../modules/network
../modules/vlan
];
hostname = "arhcive";

41
modules/vlan/default.nix Normal file
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@ -0,0 +1,41 @@
## VLAN
## ====
##
## Virtual LANs give you the ability to sub-divide a LAN. Linux can
## accept VLAN tagged traffic and presents each VLAN ID as a
## different network interface (eg: eth0.100 for VLAN ID 100)
##
## Some Liminix devices with multiple ethernet ports are implemented
## using a network switch connecting the physical ports to the CPU,
## and require using VLAN in order to send different traffic to
## different ports (e.g. LAN vs WAN)
{ lib, pkgs, config, ...}:
let
inherit (lib) mkOption types;
inherit (pkgs.liminix.services) oneshot;
inherit (pkgs) liminix;
in
{
options = {
system.service.vlan = mkOption { type = liminix.lib.types.serviceDefn; };
};
config.system.service.vlan = liminix.callService ./service.nix {
ifname = mkOption {
type = types.str;
description = "interface name to create";
};
primary = mkOption {
description = "existing physical interface";
type = liminix.lib.types.interface;
};
vid = mkOption {
description = "VLAN identifier (VID) in range 1-4094";
type = types.str;
};
};
config.kernel.config = {
VLAN_8021Q = "y";
SWCONFIG = "y"; # not always appropriate, some devices will use DSA
};
}

15
modules/vlan/service.nix Normal file
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@ -0,0 +1,15 @@
{
liminix
, lib
}:
{ ifname, primary, vid } :
let
inherit (liminix.services) oneshot;
in oneshot rec {
name = "${ifname}.link";
up = ''
ip link add link $(output ${primary} ifname) name ${ifname} type vlan id ${vid}
${liminix.networking.ifup name ifname}
'';
down = "ip link set down dev ${ifname}";
}