The following commit has been merged in the master branch: commit a44ebeff6bbd6ef50db41b4195fca87b21aefd20 Author: Linus Lüssing linus.luessing@c0d3.blue Date: Thu Jun 7 00:46:24 2018 +0200

batman-adv: Fix multicast TT issues with bogus ROAM flags

When a (broken) node wrongly sends multicast TT entries with a ROAM flag then this causes any receiving node to drop all entries for the same multicast MAC address announced by other nodes, leading to packet loss.

Fix this DoS vector by only storing TT sync flags. For multicast TT non-sync'ing flag bits like ROAM are unused so far anyway.

Fixes: 1d8ab8d3c176 ("batman-adv: Modified forwarding behaviour for multicast packets") Reported-by: Leonardo Mörlein me@irrelefant.net Signed-off-by: Linus Lüssing linus.luessing@c0d3.blue Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 61ce300091f3..12a2b7d21376 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -1705,7 +1705,8 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, ether_addr_copy(common->addr, tt_addr); common->vid = vid;

- common->flags = flags & (~BATADV_TT_SYNC_MASK); + if (!is_multicast_ether_addr(common->addr)) + common->flags = flags & (~BATADV_TT_SYNC_MASK);

tt_global_entry->roam_at = 0; /* node must store current time in case of roaming. This is @@ -1769,7 +1770,8 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, * TT_CLIENT_TEMP, therefore they have to be copied in the * client entry */ - common->flags |= flags & (~BATADV_TT_SYNC_MASK); + if (!is_multicast_ether_addr(common->addr)) + common->flags |= flags & (~BATADV_TT_SYNC_MASK);

/* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only * one originator left in the list and we previously received a