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Add multicast to unicast support

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This adds support for nl80211 NL80211_CMD_SET_MULTICAST_TO_UNICAST
command.

By setting the new hostapd configuration option multicast_to_unicast=1,
hostapd configures this AP to perform multicast to unicast conversion.

When enabled, all multicast packets with ethertype ARP, IPv4, or IPv6
(possibly within an 802.1Q header) will be sent out to each station once
with the destination (multicast) MAC address replaced by the station's
MAC address. Note that this may break certain expectations of the
receiver, e.g., the ability to drop unicast IP packets encapsulated in
multicast L2 frames, or the ability to not send destination unreachable
messages in such cases.

This also does not implement Directed Multicast Service (DMS).

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>
This commit is contained in:
Michael Braun 2016-10-31 14:58:08 +01:00 • committed by Jouni Malinen
parent 5f2c0a22a9
commit 34f7c699a6
6 changed files with 90 additions and 0 deletions
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1
src/ap/beacon.c
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@ -1288,6 +1288,7 @@ int ieee802_11_build_ap_params(struct hostapd_data *hapd,
params->osen = 1;
}
#endif /* CONFIG_HS20 */
params->multicast_to_unicast = hapd->conf->multicast_to_unicast;
params->pbss = hapd->conf->pbss;
return 0;
}