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61caf3d109
linux/net/batman-adv
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Linus Lüssing 61caf3d109 batman-adv: mcast: detect, distribute and maintain multicast router presence 
To be able to apply our group aware multicast optimizations to packets
with a scope greater than link-local we need to not only keep track of
multicast listeners but also multicast routers.

With this patch a node detects the presence of multicast routers on
its segment by checking if
/proc/sys/net/ipv{4,6}/conf/<bat0|br0(bat)>/mc_forwarding is set for one
thing. This option is enabled by multicast routing daemons and needed
for the kernel's multicast routing tables to receive and route packets.

For another thing if a bridge is configured on top of bat0 then the
presence of an IPv6 multicast router behind this bridge is currently
detected by checking for an IPv6 multicast "All Routers Address"
(ff02::2). This should later be replaced by querying the bridge, which
performs proper, RFC4286 compliant Multicast Router Discovery (our
simplified approach includes more hosts than necessary, most notably
not just multicast routers but also unicast ones and is not applicable
for IPv4).

If no multicast router is detected then this is signalized via the new
BATADV_MCAST_WANT_NO_RTR4 and BATADV_MCAST_WANT_NO_RTR6
multicast tvlv flags.

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>
2019-06-27 19:25:05 +02:00
..
bat_algo.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bat_algo.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
bat_iv_ogm.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bat_iv_ogm.h batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bat_v_elp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-05 14:14:19 -07:00
bat_v_elp.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
bat_v_ogm.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bat_v_ogm.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
bat_v.c batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
bat_v.h batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bitarray.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bitarray.h batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
bridge_loop_avoidance.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-05 14:14:19 -07:00
bridge_loop_avoidance.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
debugfs.c batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
debugfs.h batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
distributed-arp-table.c batman-adv: allow updating DAT entry timeouts on incoming ARP Replies 2019-03-25 10:01:13 +01:00
distributed-arp-table.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
fragmentation.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
fragmentation.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
gateway_client.c batman-adv: Make sysfs support optional 2019-03-25 10:01:11 +01:00
gateway_client.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
gateway_common.c batman-adv: Fix includes for *_MAX constants 2019-05-25 12:59:53 +02:00
gateway_common.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
hard-interface.c batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
hard-interface.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
hash.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
hash.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
icmp_socket.c batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
icmp_socket.h batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
Kconfig batman-adv: Make sysfs support optional 2019-03-25 10:01:11 +01:00
log.c batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
log.h batman-adv: Add missing include for atomic functions 2019-05-25 12:59:53 +02:00
main.c This feature/cleanup patchset includes the following patches: 2019-05-09 09:44:17 -07:00
main.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
Makefile batman-adv: Make sysfs support optional 2019-03-25 10:01:11 +01:00
multicast.c batman-adv: mcast: detect, distribute and maintain multicast router presence 2019-06-27 19:25:05 +02:00
multicast.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
netlink.c batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
netlink.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
network-coding.c batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
network-coding.h batman-adv: no need to check return value of debugfs_create functions 2019-06-27 19:25:04 +02:00
originator.c batman-adv: mcast: detect, distribute and maintain multicast router presence 2019-06-27 19:25:05 +02:00
originator.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
routing.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
routing.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
send.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
send.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
soft-interface.c batman-adv: mcast: shorten multicast tt/tvlv worker spinlock section 2019-05-25 12:59:54 +02:00
soft-interface.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
sysfs.c batman-adv: Fix includes for *_MAX constants 2019-05-25 12:59:53 +02:00
sysfs.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
tp_meter.c batman-adv: Fix includes for *_MAX constants 2019-05-25 12:59:53 +02:00
tp_meter.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
trace.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
trace.h batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
translation-table.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-05 14:14:19 -07:00
translation-table.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
tvlv.c batman-adv: Drop license boilerplate 2019-03-25 09:31:35 +01:00
tvlv.h batman-adv: Use includes instead of fwdecls 2019-05-25 12:59:53 +02:00
types.h batman-adv: mcast: detect, distribute and maintain multicast router presence 2019-06-27 19:25:05 +02:00