net: ipv4: Drop incoming packets with src addr is multicast

As per RFC1112 sec 6.2 "A host group address must never be placed in the source address field or anywhere in a source route or record route option of an outgoing IP datagram." Signed-off-by: Ravi kumar Veeramally <[email protected]>
Tronil · Nov 28, 2018 · 7a5640f · 7a5640f
1 parent 3746652
commit 7a5640f
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/subsys/net/ip/ipv4.c b/subsys/net/ip/ipv4.c
@@ -122,7 +122,13 @@ enum net_verdict net_ipv4_process_pkt(struct net_pkt *pkt)
 		goto drop;
 	}
 
+	if (net_ipv4_is_addr_mcast(&hdr->src)) {
+		NET_DBG("DROP: src addr is mcast");
+		goto drop;
+	}
+
 	if (net_ipv4_is_addr_bcast(net_pkt_iface(pkt), &hdr->src)) {
+		NET_DBG("DROP: src addr is bcast");
 		goto drop;
 	}