Re: [PATCH v3 3/5] batman-adv: mcast: implement multicast packet reception and forwarding

Implement functionality to receive and forward a new TVLV capable multicast packet type. The new batman-adv multicast packet type allows to contain several originator destination addresses within a TVLV. Routers on the way will potentially split the batman-adv multicast packet and adjust its tracker TVLV contents. Routing decisions are still based on the selected BATMAN IV or BATMAN V routing algorithm. So this new batman-adv multicast packet type retains the same loop-free properties. Also a new OGM multicast TVLV flag is introduced to signal to other nodes that we are capable of handling a batman-adv multicast packet and multicast tracker TVLV. And that all of our hard interfaces have an MTU of at least 1280 bytes (IPv6 minimum MTU), as a simple solution for now to avoid MTU issues while forwarding. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- include/uapi/linux/batadv_packet.h | 48 ++++- net/batman-adv/Makefile | 1 + net/batman-adv/main.c | 2 + net/batman-adv/multicast.c | 48 ++++- net/batman-adv/multicast.h | 5 + net/batman-adv/multicast_forw.c | 274 +++++++++++++++++++++++++++++ net/batman-adv/originator.c | 1 + net/batman-adv/routing.c | 68 +++++++ net/batman-adv/routing.h | 11 ++ net/batman-adv/soft-interface.c | 12 ++ net/batman-adv/types.h | 64 +++++++ 11 files changed, 523 insertions(+), 11 deletions(-) create mode 100644 net/batman-adv/multicast_forw.c