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station: set sysfs options required by HS2.0 spec

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The Hotspot 2.0 spec has some requirements that IWD was missing depending
on a few bits in extended capabilities and the HS2.0 indication element.
These requirements correspond to a few sysfs options that can be set in
the kernel which are now set on CONNECTED and unset on DISCONNECTED.
This commit is contained in:
James Prestwood 2021-11-04 10:57:57 -07:00 committed by Denis Kenzior
parent d4e3ec52b2
commit ba5f4616d2
1 changed files with 51 additions and 1 deletions
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52
src/station.c
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@ -1400,6 +1400,31 @@ static void station_set_evict_nocarrier(struct station *station, bool value)
"ndisc_evict_nocarrier", v);
}
/*
* Handles dropping ARP (IPv4) and neighbor advertisements (IPv6) settings.
*/
static void station_set_drop_neighbor_discovery(struct station *station,
bool value)
{
char *v = value ? "1" : "0";
sysfs_write_ipv4_setting(netdev_get_name(station->netdev),
"drop_gratuitous_arp", v);
sysfs_write_ipv6_setting(netdev_get_name(station->netdev),
"drop_unsolicited_na", v);
}
static void station_set_drop_unicast_l2_multicast(struct station *station,
bool value)
{
char *v = value ? "1" : "0";
sysfs_write_ipv4_setting(netdev_get_name(station->netdev),
"drop_unicast_in_l2_multicast", v);
sysfs_write_ipv6_setting(netdev_get_name(station->netdev),
"drop_unicast_in_l2_multicast", v);
}
static void station_enter_state(struct station *station,
enum station_state state)
{
@ -1452,11 +1477,36 @@ static void station_enter_state(struct station *station,
netdev_get_path(station->netdev),
IWD_STATION_DIAGNOSTIC_INTERFACE,
station);
/* Fall through */
periodic_scan_stop(station);
station_set_evict_nocarrier(station, true);
/*
* Hotspot Specification 2.0 - Section 6.5
*
* " - Shall drop all received {gratuitous ARP, unsolicited
* Neighbor Advertisement} messages when the Proxy ARP field
* is set to 1 in the Extended Capabilities element of the
* serving AP.
*
* - When the serving AP transmits frames containing an HS2.0
* Indication element in which the value of the DGAF Disable
* bit subfield is set to 0, the mobile device should
* discard all received unicast IP packets that were
* decrypted using the GTK"
*/
if (station->connected_bss->proxy_arp)
station_set_drop_neighbor_discovery(station, true);
if (station->connected_bss->hs20_dgaf_disable)
station_set_drop_unicast_l2_multicast(station, true);
break;
case STATION_STATE_DISCONNECTED:
periodic_scan_stop(station);
station_set_evict_nocarrier(station, true);
station_set_drop_neighbor_discovery(station, false);
station_set_drop_unicast_l2_multicast(station, false);
break;
case STATION_STATE_DISCONNECTING:
break;