Re: [PATCH] station: check support for all sysfs settings

[James Prestwood <prestwoj@gmail.com>]

Hi Martin,

On 10/25/24 4:14 AM, Martin Petzold wrote:
> Hi James,
>
> Am 24.10.24 um 15:16 schrieb James Prestwood:
>> If IPv6 is disabled or not supported at the kernel level writing the
>> sysfs settings will fail. A few of them had a support check but this
>> patch adds a supported bool to the remainder so we done get errors
>> like:
> I have IPv6 disabled. What is the impact of this issue without the 
> patches? Connection losses?
No functional impact, its just silencing warning that occur when IPv6 is 
disabled.
>> Unable to write drop_unsolicited_na to 
>> /proc/sys/net/ipv6/conf/wlan0/drop_unsolicited_na
>> ---
>>   src/station.c | 36 ++++++++++++++++++++++++++++--------
>>   1 file changed, 28 insertions(+), 8 deletions(-)
>>
>> diff --git a/src/station.c b/src/station.c
>> index cef6c66a..34537b26 100644
>> --- a/src/station.c
>> +++ b/src/station.c
>> @@ -74,6 +74,10 @@ static uint32_t roam_retry_interval;
>>   static bool anqp_disabled;
>>   static bool supports_arp_evict_nocarrier;
>>   static bool supports_ndisc_evict_nocarrier;
>> +static bool supports_drop_gratuitous_arp;
>> +static bool supports_drop_unsolicited_na;
>> +static bool supports_ipv4_drop_unicast_in_l2_multicast;
>> +static bool supports_ipv6_drop_unicast_in_l2_multicast;
>>   static struct watchlist event_watches;
>>   static uint32_t known_networks_watch;
>>   static uint32_t allowed_bands;
>> @@ -1641,10 +1645,13 @@ static void 
>> station_set_drop_neighbor_discovery(struct station *station,
>>   {
>>       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);
>> +    if (supports_drop_gratuitous_arp)
>> + sysfs_write_ipv4_setting(netdev_get_name(station->netdev),
>> +                    "drop_gratuitous_arp", v);
>> +
>> +    if (supports_drop_unsolicited_na)
>> + sysfs_write_ipv6_setting(netdev_get_name(station->netdev),
>> +                    "drop_unsolicited_na", v);
>>   }
>>     static void station_set_drop_unicast_l2_multicast(struct station 
>> *station,
>> @@ -1652,10 +1659,13 @@ static void 
>> station_set_drop_unicast_l2_multicast(struct station *station,
>>   {
>>       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);
>> +    if (supports_ipv4_drop_unicast_in_l2_multicast)
>> + sysfs_write_ipv4_setting(netdev_get_name(station->netdev),
>> +                    "drop_unicast_in_l2_multicast", v);
>> +
>> +    if (supports_ipv6_drop_unicast_in_l2_multicast)
>> + sysfs_write_ipv6_setting(netdev_get_name(station->netdev),
>> +                    "drop_unicast_in_l2_multicast", v);
>>   }
>>     static void station_signal_agent_notify(struct station *station);
>> @@ -5813,6 +5823,16 @@ static int station_init(void)
>>                           "arp_evict_nocarrier");
>>       supports_ndisc_evict_nocarrier = 
>> sysfs_supports_ipv6_setting("all",
>>                           "ndisc_evict_nocarrier");
>> +    supports_drop_gratuitous_arp = sysfs_supports_ipv4_setting("all",
>> +                        "drop_gratuitous_arp");
>> +    supports_drop_unsolicited_na = sysfs_supports_ipv6_setting("all",
>> +                        "drop_unsolicited_na");
>> +    supports_ipv4_drop_unicast_in_l2_multicast =
>> +                    sysfs_supports_ipv4_setting("all",
>> +                    "drop_unicast_in_l2_multicast");
>> +    supports_ipv6_drop_unicast_in_l2_multicast =
>> +                    sysfs_supports_ipv6_setting("all",
>> +                    "drop_unicast_in_l2_multicast");
>>         watchlist_init(&event_watches, NULL);
>