luci-mod-network: handle dynamic device configuration defaults

Most uci network device configuration settings have no specific default
value which means that netifd will only alter the related sysfs parameters
if an explicit value is specified in uci. When omitted from the
configuration, the related sysfs setting is left untouched.

This behaviour collides with LuCI's approach of purging boolean options
from the configuration if they match their default value, leading to the
inability to disable or enable certain settings as described in #6219.

Solve this issue by replacing flag widgets with tri-state selects offering
an "automatic" (default) as well as an explicit "enabled" and "disabled"
choice. Also query sysfs on load and preset the automatic choice with an
indication whether the underlying sysfs settings is currently active or not.

Fixes: #6219
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 109 insertions, 33 deletions

diff --git a/modules/luci-mod-network/htdocs/luci-static/resources/tools/network.js b/modules/luci-mod-network/htdocs/luci-static/resources/tools/network.js
index c31015a564..97bbf0ab5d 100644
--- a/modules/luci-mod-network/htdocs/luci-static/resources/tools/network.js
+++ b/modules/luci-mod-network/htdocs/luci-static/resources/tools/network.js
@@ -1,4 +1,5 @@
 'use strict';
+'require fs';
 'require ui';
 'require dom';
 'require uci';
@@ -149,25 +150,77 @@ function updatePlaceholders(opt, section_id) {
 	}
 }
 
+var cbiFlagTristate = form.ListValue.extend({
+	__init__: function(/* ... */) {
+		this.super('__init__', arguments);
+		this.keylist = [ '', '0!', '1!' ];
+		this.vallist = [ _('automatic'), _('disabled'), _('enabled') ];
+	},
+
+	load: function(section_id) {
+		var invert = false, sysfs = this.sysfs;
+
+		if (sysfs) {
+			if (sysfs.charAt(0) == '!') {
+				invert = true;
+				sysfs = sysfs.substring(1);
+			}
+
+			return L.resolveDefault(fs.read(sysfs), '').then(L.bind(function(res) {
+				res = (res || '').trim();
+
+				if (res == '0')
+					this.sysfs_default = invert;
+				else if (res == '1')
+					this.sysfs_default = !invert;
+
+				return this.super('load', [section_id]);
+			}, this));
+		}
+
+		return this.super('load', [section_id]);
+	},
+
+	write: function(section_id, formvalue) {
+		if (formvalue == '1!')
+			return this.super('write', [section_id, '1']);
+		else if (formvalue == '0!')
+			return this.super('write', [section_id, '0']);
+		else
+			return this.super('remove', [section_id]);
+	},
+
+	renderWidget: function(section_id, option_index, cfgvalue) {
+		var sysdef = this.sysfs_default;
+
+		if (this.sysfs_default !== null) {
+			this.keylist[0] = sysdef ? '1' : '0';
+			this.vallist[0] = sysdef ? _('automatic (enabled)') : _('automatic (disabled)');
+		}
+
+		return this.super('renderWidget', [section_id, option_index, cfgvalue]);
+	}
+});
+
 
 var cbiTagValue = form.Value.extend({
 	renderWidget: function(section_id, option_index, cfgvalue) {
 		var widget = new ui.Dropdown(cfgvalue || ['-'], {
 			'-': E([], [
 				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ '—' ]),
-				E('span', { 'class': 'hide-close' }, [ _('Do not participate', 'VLAN port state') ])
+				E('span', { 'class': 'hide-close' }, [ _('Not Member', 'VLAN port state') ])
 			]),
 			'u': E([], [
-				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ 'u' ]),
-				E('span', { 'class': 'hide-close' }, [ _('Egress untagged', 'VLAN port state') ])
+				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ 'U' ]),
+				E('span', { 'class': 'hide-close' }, [ _('Untagged', 'VLAN port state') ])
 			]),
 			't': E([], [
-				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ 't' ]),
-				E('span', { 'class': 'hide-close' }, [ _('Egress tagged', 'VLAN port state') ])
+				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ 'T' ]),
+				E('span', { 'class': 'hide-close' }, [ _('Tagged', 'VLAN port state') ])
 			]),
 			'*': E([], [
 				E('span', { 'class': 'hide-open', 'style': 'font-family:monospace' }, [ '*' ]),
-				E('span', { 'class': 'hide-close' }, [ _('Primary VLAN ID', 'VLAN port state') ])
+				E('span', { 'class': 'hide-close' }, [ _('Is Primary VLAN', 'VLAN port state') ])
 			])
 		}, {
 			id: this.cbid(section_id),
@@ -331,6 +384,7 @@ return baseclass.extend({
 
 	addDeviceOptions: function(s, dev, isNew) {
 		var parent_dev = dev ? dev.getParent() : null,
+		    devname = dev ? dev.getName() : null,
 		    o, ss;
 
 		s.tab('devgeneral', _('General device options'));
@@ -619,8 +673,8 @@ return baseclass.extend({
 		o.placeholder = dev ? dev._devstate('qlen') : '';
 		o.datatype = 'uinteger';
 
-		o = this.replaceOption(s, 'devadvanced', form.Flag, 'promisc', _('Enable promiscuous mode'));
-		o.default = o.disabled;
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'promisc', _('Enable promiscuous mode'));
+		o.sysfs_default = (dev && dev.dev && dev.dev.flags) ? dev.dev.flags.promisc : null;
 
 		o = this.replaceOption(s, 'devadvanced', form.ListValue, 'rpfilter', _('Reverse path filter'));
 		o.default = '';
@@ -644,11 +698,17 @@ return baseclass.extend({
 			}
 		};
 
-		o = this.replaceOption(s, 'devadvanced', form.Flag, 'acceptlocal', _('Accept local'), _('Accept packets with local source addresses'));
-		o.default = o.disabled;
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'acceptlocal', _('Accept local'), _('Accept packets with local source addresses'));
+		o.sysfs = '/proc/sys/net/ipv4/conf/%s/accept_local'.format(devname || 'default');
 
-		o = this.replaceOption(s, 'devadvanced', form.Flag, 'sendredirects', _('Send ICMP redirects'));
-		o.default = o.enabled;
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'sendredirects', _('Send ICMP redirects'));
+		o.sysfs = '/proc/sys/net/ipv4/conf/%s/send_redirects'.format(devname || 'default');
+
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'arp_accept ', _('Honor gratuitous ARP'), _('When enabled, new ARP table entries are added from received gratuitous APR requests or replies, otherwise only preexisting table entries are updated, but no new hosts are learned.'));
+		o.sysfs = '/proc/sys/net/ipv4/conf/%s/arp_accept'.format(devname || 'default');
+
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'drop_gratuitous_arp', _('Drop gratuitous ARP'), _('Drop all gratuitous ARP frames, for example if there’s a known good ARP proxy on the network and such frames need not be used or in the case of 802.11, must not be used to prevent attacks.'));
+		o.sysfs = '/proc/sys/net/ipv4/conf/%s/drop_gratuitous_arp'.format(devname || 'default');
 
 		o = this.replaceOption(s, 'devadvanced', form.Value, 'neighreachabletime', _('Neighbour cache validity'), _('Time in milliseconds'));
 		o.placeholder = '30000';
@@ -662,59 +722,75 @@ return baseclass.extend({
 		o.placeholder = '0';
 		o.datatype = 'uinteger';
 
-		o = this.replaceOption(s, 'devgeneral', form.Flag, 'ipv6', _('Enable IPv6'));
+		o = this.replaceOption(s, 'devgeneral', cbiFlagTristate, 'ipv6', _('Enable IPv6'));
+		o.sysfs = '!/proc/sys/net/ipv6/conf/%s/disable_ipv6'.format(devname || 'default');
 		o.migrate = false;
-		o.default = o.enabled;
+
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'ip6segmentrouting', _('Enable IPv6 segment routing'));
+		o.sysfs = '/proc/sys/net/ipv6/conf/%s/seg6_enabled'.format(devname || 'default');
+		o.depends('ipv6', /1/);
+
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'drop_unsolicited_na', _('Drop unsolicited NA'), _('Drop all unsolicited neighbor advertisements, for example if there’s a known good NA proxy on the network and such frames need not be used or in the case of 802.11, must not be used to prevent attacks.'));
+		o.sysfs = '/proc/sys/net/ipv6/conf/%s/drop_unsolicited_na'.format(devname || 'default');
+		o.depends('ipv6', /1/);
 
 		o = this.replaceOption(s, 'devgeneral', form.Value, 'mtu6', _('IPv6 MTU'));
 		o.datatype = 'max(9200)';
-		o.depends('ipv6', '1');
+		o.depends('ipv6', /1/);
 
 		o = this.replaceOption(s, 'devgeneral', form.Value, 'dadtransmits', _('DAD transmits'), _('Amount of Duplicate Address Detection probes to send'));
 		o.placeholder = '1';
 		o.datatype = 'uinteger';
-		o.depends('ipv6', '1');
+		o.depends('ipv6', /1/);
 
 
-		o = this.replaceOption(s, 'devadvanced', form.Flag, 'multicast', _('Enable multicast support'));
-		o.default = o.enabled;
+		o = this.replaceOption(s, 'devadvanced', cbiFlagTristate, 'multicast', _('Enable multicast support'));
+		o.sysfs_default = (dev && dev.dev && dev.dev.flags) ? dev.dev.flags.multicast : null;
 
 		o = this.replaceOption(s, 'devadvanced', form.ListValue, 'igmpversion', _('Force IGMP version'));
 		o.value('', _('No enforcement'));
 		o.value('1', _('Enforce IGMPv1'));
 		o.value('2', _('Enforce IGMPv2'));
 		o.value('3', _('Enforce IGMPv3'));
-		o.depends('multicast', '1');
+		o.depends('multicast', /1/);
 
 		o = this.replaceOption(s, 'devadvanced', form.ListValue, 'mldversion', _('Force MLD version'));
 		o.value('', _('No enforcement'));
 		o.value('1', _('Enforce MLD version 1'));
 		o.value('2', _('Enforce MLD version 2'));
-		o.depends('multicast', '1');
+		o.depends('multicast', /1/);
 
 		if (isBridgePort(dev)) {
-			o = this.replaceOption(s, 'brport', form.Flag, 'learning', _('Enable MAC address learning'));
-			o.default = o.enabled;
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'learning', _('Enable MAC address learning'));
+			o.sysfs = '/sys/class/net/%s/brport/learning'.format(devname || 'default');
 
-			o = this.replaceOption(s, 'brport', form.Flag, 'unicast_flood', _('Enable unicast flooding'));
-			o.default = o.enabled;
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'unicast_flood', _('Enable unicast flooding'));
+			o.sysfs = '/sys/class/net/%s/brport/unicast_flood'.format(devname || 'default');
 
-			o = this.replaceOption(s, 'brport', form.Flag, 'isolate', _('Port isolation'), _('Only allow communication with non-isolated bridge ports when enabled'));
-			o.default = o.disabled;
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'isolate', _('Port isolation'), _('Only allow communication with non-isolated bridge ports when enabled'));
+			o.sysfs = '/sys/class/net/%s/brport/isolated'.format(devname || 'default');
 
 			o = this.replaceOption(s, 'brport', form.ListValue, 'multicast_router', _('Multicast routing'));
 			o.value('', _('Never'));
 			o.value('1', _('Learn'));
 			o.value('2', _('Always'));
-			o.depends('multicast', '1');
+			o.depends('multicast', /1/);
+
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'multicast_to_unicast', _('Multicast to unicast'), _('Forward multicast packets as unicast packets on this device.'));
+			o.sysfs = '/sys/class/net/%s/brport/multicast_to_unicast'.format(devname || 'default');
+			o.depends('multicast', /1/);
+
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'multicast_fast_leave', _('Enable multicast fast leave'));
+			o.sysfs = '/sys/class/net/%s/brport/multicast_fast_leave'.format(devname || 'default');
+			o.depends('multicast', /1/);
 
-			o = this.replaceOption(s, 'brport', form.Flag, 'multicast_to_unicast', _('Multicast to unicast'), _('Forward multicast packets as unicast packets on this device.'));
-			o.default = o.disabled;
-			o.depends('multicast', '1');
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'drop_v4_unicast_in_l2_multicast', _('Drop nested IPv4 unicast'), _('Drop layer 2 multicast frames containing IPv4 unicast packets.'));
+			o.sysfs = '/proc/sys/net/ipv4/conf/%s/drop_unicast_in_l2_multicast'.format(devname || 'default');
+			o.depends('multicast', /1/);
 
-			o = this.replaceOption(s, 'brport', form.Flag, 'multicast_fast_leave', _('Enable multicast fast leave'));
-			o.default = o.disabled;
-			o.depends('multicast', '1');
+			o = this.replaceOption(s, 'brport', cbiFlagTristate, 'drop_v6_unicast_in_l2_multicast', _('Drop nested IPv6 unicast'), _('Drop layer 2 multicast frames containing IPv6 unicast packets.'));
+			o.sysfs = '/proc/sys/net/ipv6/conf/%s/drop_unicast_in_l2_multicast'.format(devname || 'default');
+			o.depends('multicast', /1/);
 		}
 
 		o = this.replaceOption(s, 'bridgevlan', form.Flag, 'vlan_filtering', _('Enable VLAN filtering'));