tipc: introduce group multicast messaging

The previously introduced message transport to all group members is
based on the tipc multicast service, but is logically a broadcast
service within the group, and that is what we call it.

We now add functionality for sending messages to all group members
having a certain identity. Correspondingly, we call this feature 'group
multicast'. The service is using unicast when only one destination is
found, otherwise it will use the bearer broadcast service to transfer
the messages. In the latter case, the receiving members filter arriving
messages by looking at the intended destination instance. If there is
no match, the message will be dropped, while still being considered
received and read as seen by the flow control mechanism.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 1 deletions

diff --git a/net/tipc/group.c b/net/tipc/group.c
index 16aaaa97a005..ffac2f33fce2 100644
--- a/net/tipc/group.c
+++ b/net/tipc/group.c
@@ -413,10 +413,22 @@ void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq,
 	if (!tipc_group_is_receiver(m))
 		goto drop;
 
+	m->bc_rcv_nxt = msg_grp_bc_seqno(hdr) + 1;
+
+	/* Drop multicast here if not for this member */
+	if (mtyp == TIPC_GRP_MCAST_MSG) {
+		if (msg_nameinst(hdr) != grp->instance) {
+			m->bc_rcv_nxt = msg_grp_bc_seqno(hdr) + 1;
+			tipc_group_update_rcv_win(grp, msg_blocks(hdr),
+						  node, port, xmitq);
+			kfree_skb(skb);
+			return;
+		}
+	}
+
 	TIPC_SKB_CB(skb)->orig_member = m->instance;
 	__skb_queue_tail(inputq, skb);
 
-	m->bc_rcv_nxt = msg_grp_bc_seqno(hdr) + 1;
 	return;
 drop:
 	kfree_skb(skb);