The following commit has been merged in the master branch: commit 74c12c630fe310eb7fcae1b292257d47781fff0a Author: Linus Lüssing linus.luessing@c0d3.blue Date: Sun Mar 4 13:08:17 2018 +0100
batman-adv: Fix multicast packet loss with a single WANT_ALL_IPV4/6 flag
As the kernel doc describes too the code is supposed to skip adding multicast TT entries if both the WANT_ALL_IPV4 and WANT_ALL_IPV6 flags are present.
Unfortunately, the current code even skips adding multicast TT entries if only either the WANT_ALL_IPV4 or WANT_ALL_IPV6 is present.
This could lead to IPv6 multicast packet loss if only an IGMP but not an MLD querier is present for instance or vice versa.
Fixes: 687937ab3489 ("batman-adv: Add multicast optimization support for bridged setups") 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
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index cbdeb47ec3f6..d70640135e3a 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -543,8 +543,8 @@ update: bat_priv->mcast.enabled = true; }
- return !(mcast_data.flags & - (BATADV_MCAST_WANT_ALL_IPV4 | BATADV_MCAST_WANT_ALL_IPV6)); + return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && + mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); }
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