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Linus Lüssing 24e5e941d8 batman-adv: mcast: fix duplicate mcast packets in BLA backbone from LAN [ Upstream commit `3236d215ad` ] Scenario: * Multicast frame send from a BLA backbone (multiple nodes with their bat0 bridged together, with BLA enabled) Issue: * BLA backbone nodes receive the frame multiple times on bat0 For multicast frames received via batman-adv broadcast packets the originator of the broadcast packet is checked before decapsulating and forwarding the frame to bat0 (batadv_bla_is_backbone_gw()-> batadv_recv_bcast_packet()). If it came from a node which shares the same BLA backbone with us then it is not forwarded to bat0 to avoid a loop. When sending a multicast frame in a non-4-address batman-adv unicast packet we are currently missing this check - and cannot do so because the batman-adv unicast packet has no originator address field. However, we can simply fix this on the sender side by only sending the multicast frame via unicasts to interested nodes which do not share the same BLA backbone with us. This also nicely avoids some unnecessary transmissions on mesh side. Note that no infinite loop was observed, probably because of dropping via batadv_interface_tx()->batadv_bla_tx(). However the duplicates still utterly confuse switches/bridges, ICMPv6 duplicate address detection and neighbor discovery and therefore leads to long delays before being able to establish TCP connections, for instance. And it also leads to the Linux bridge printing messages like: "br-lan: received packet on eth1 with own address as source address ..." Fixes: `2d3f6ccc4e` ("batman-adv: Modified forwarding behaviour for multicast packets") 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> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-10-01 13:18:19 +02:00
Documentation	…
LICENSES	…
arch	…
block	block: only call sched requeue_request() for scheduled requests	2020-09-23 12:40:37 +02:00
certs	…
crypto	crypto: af_alg - Work around empty control messages without MSG_MORE	2020-09-03 11:27:05 +02:00
drivers	nvme-tcp: fix kconfig dependency warning when !CRYPTO	2020-10-01 13:18:19 +02:00
fs	btrfs: qgroup: fix data leak caused by race between writeback and truncate	2020-10-01 13:18:10 +02:00
include	net: qed: Disable aRFS for NPAR and 100G	2020-10-01 13:18:18 +02:00
init	…
ipc	ipc/util.c: sysvipc_find_ipc() incorrectly updates position index	2020-05-20 08:20:16 +02:00
kernel	lockdep: fix order in trace_hardirqs_off_caller()	2020-10-01 13:18:14 +02:00
lib	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2020-10-01 13:17:10 +02:00
mm	…
net	batman-adv: mcast: fix duplicate mcast packets in BLA backbone from LAN	2020-10-01 13:18:19 +02:00
samples	bpf: Fix fds_example SIGSEGV error	2020-08-19 08:16:03 +02:00
scripts	…
security	…
sound	ASoC: Intel: bytcr_rt5640: Add quirk for MPMAN Converter9 2-in-1	2020-10-01 13:18:13 +02:00
tools	objtool: Fix noreturn detection for ignored functions	2020-10-01 13:18:15 +02:00
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README	…

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.