This patch adds the forwarding of multicast data packets to the local soft interface if this receiving node is a member of the same multicast group as specified in the multicast packet.
Signed-off-by: Linus Lüssing <[email protected]> --- hard-interface.c | 5 +++++ routing.c | 30 ++++++++++++++++++++++++++++++ routing.h | 1 + 3 files changed, 36 insertions(+), 0 deletions(-) diff --git a/hard-interface.c b/hard-interface.c index 3b380e1..b668ae6 100644 --- a/hard-interface.c +++ b/hard-interface.c @@ -624,6 +624,11 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, ret = recv_bcast_packet(skb, batman_if); break; + /* multicast packet */ + case BAT_MCAST: + ret = recv_mcast_packet(skb, batman_if); + break; + /* multicast tracker packet */ case BAT_MCAST_TRACKER: ret = recv_mcast_tracker_packet(skb, batman_if); diff --git a/routing.c b/routing.c index ff74bd1..b1aad26 100644 --- a/routing.c +++ b/routing.c @@ -1388,6 +1388,36 @@ int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) return NET_RX_SUCCESS; } +int recv_mcast_packet(struct sk_buff *skb, struct batman_if *recv_if) +{ + struct ethhdr *ethhdr; + MC_LIST *mc_entry; + unsigned long flags; + int ret = 1; + int hdr_size = sizeof(struct mcast_packet); + + /* multicast data packets might be received via unicast or broadcast */ + if (check_unicast_packet(skb, hdr_size) < 0 && + check_broadcast_packet(skb, hdr_size) < 0) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)(skb->data + sizeof(struct mcast_packet)); + + /* multicast for me? */ + MC_LIST_LOCK(recv_if->soft_iface, flags); + netdev_for_each_mc_addr(mc_entry, recv_if->soft_iface) { + ret = memcmp(mc_entry->MC_LIST_ADDR, ethhdr->h_dest, ETH_ALEN); + if (!ret) + break; + } + MC_LIST_UNLOCK(recv_if->soft_iface, flags); + + if (!ret) + interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + + return NET_RX_SUCCESS; +} + int recv_mcast_tracker_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); diff --git a/routing.h b/routing.h index ad3f054..6b45212 100644 --- a/routing.h +++ b/routing.h @@ -38,6 +38,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if); +int recv_mcast_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_mcast_tracker_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if); int recv_bat_packet(struct sk_buff *skb, struct batman_if *recv_if); -- 1.7.1
