The following commit has been merged in the master branch: commit 099e6cc1582dc2903fecb898bbeae8f7cf4262c7 Author: Linus Lüssing linus.luessing@c0d3.blue Date: Thu Feb 14 16:52:43 2019 +0100

batman-adv: allow updating DAT entry timeouts on incoming ARP Replies

Currently incoming ARP Replies, for example via a DHT-PUT message, do not update the timeout for an already existing DAT entry. These ARP Replies are dropped instead.

This however defeats the purpose of the DHCPACK snooping, for instance. Right now, a DAT entry in the DHT will be purged every five minutes, likely leading to a mesh-wide ARP Request broadcast after this timeout. Which then recreates the entry. The idea of the DHCPACK snooping is to be able to update an entry before a timeout happens, to avoid ARP Request flooding.

This patch fixes this issue by updating a DAT entry on incoming ARP Replies even if a matching DAT entry already exists. While still filtering the ARP Reply towards the soft-interface, to avoid duplicate messages on the client device side.

Signed-off-by: Linus Lüssing linus.luessing@c0d3.blue Acked-by: Antonio Quartulli a@unstable.cc Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index 81fc63fc1936..b0af3a11d406 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -1434,7 +1434,6 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, hw_src, &ip_src, hw_dst, &ip_dst, dat_entry->mac_addr, &dat_entry->ip); dropped = true; - goto out; }

/* Update our internal cache with both the IP addresses the node got @@ -1443,6 +1442,9 @@ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid);

+ if (dropped) + goto out; + /* If BLA is enabled, only forward ARP replies if we have claimed the * source of the ARP reply or if no one else of the same backbone has * already claimed that client. This prevents that different gateways