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batman-adv: Snoop DHCPACKs for DAT

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In a 1000 nodes mesh network (Freifunk Hamburg) we can still see
30KBit/s of ARP traffic (equalling about 25% of all layer two
specific overhead, remaining after some filtering) flooded through
the mesh. These 30KBit/s are mainly ARP Requests from the
gateways / DHCP servers.

By snooping DHCPACKs we can learn about MAC/IP address pairs
in the DHCP range without relying on ARP. This patch is in preparation
to eliminate the need for mesh wide message flooding for IPv4 address
resolution.

Also this allows to quickly update a MAC/IP pair at least in the DHT when
DHCP reassigns an IP address to a new host.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing
2018-12-30 16:52:53 +01:00
committed by Simon Wunderlich
parent 25c097ca41
commit b61ec31c85
4 changed files with 431 additions and 2 deletions
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4
net/batman-adv/routing.c
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@@ -1043,6 +1043,8 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
hdr_size))
goto rx_success;
batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size);
batadv_interface_rx(recv_if->soft_iface, skb, hdr_size,
orig_node);
@@ -1278,6 +1280,8 @@ int batadv_recv_bcast_packet(struct sk_buff *skb,
if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size))
goto rx_success;
batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size);
/* broadcast for me */
batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node);