af_packet: Teach to listen for multiple unicast addresses.
The the PACKET_ADD_MEMBERSHIP and the PACKET_DROP_MEMBERSHIP setsockopt
calls for af_packet already has all of the infrastructure needed to subscribe
to multiple mac addresses. All that is missing is a flag to say that
the address we want to listen on is a unicast address.
So introduce PACKET_MR_UNICAST and wire it up to dev_unicast_add and
dev_unicast_delete.
Additionally I noticed that errors from dev_mc_add were not propagated
from packet_dev_mc so fix that.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index 5b2bade..dea7d6b 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -145,5 +145,6 @@
#define PACKET_MR_MULTICAST 0
#define PACKET_MR_PROMISC 1
#define PACKET_MR_ALLMULTI 2
+#define PACKET_MR_UNICAST 3
#endif
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 766e6b4..c7c5d52 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1570,9 +1570,9 @@
switch (i->type) {
case PACKET_MR_MULTICAST:
if (what > 0)
- dev_mc_add(dev, i->addr, i->alen, 0);
+ return dev_mc_add(dev, i->addr, i->alen, 0);
else
- dev_mc_delete(dev, i->addr, i->alen, 0);
+ return dev_mc_delete(dev, i->addr, i->alen, 0);
break;
case PACKET_MR_PROMISC:
return dev_set_promiscuity(dev, what);
@@ -1580,6 +1580,12 @@
case PACKET_MR_ALLMULTI:
return dev_set_allmulti(dev, what);
break;
+ case PACKET_MR_UNICAST:
+ if (what > 0)
+ return dev_unicast_add(dev, i->addr, i->alen);
+ else
+ return dev_unicast_delete(dev, i->addr, i->alen);
+ break;
default:;
}
return 0;
