net: ipv4: Drop packet if source address is my address

If we receive a packet where the source address is our own address, then we should drop it. Signed-off-by: Jukka Rissanen <[email protected]> (cherry picked from commit 19392a6)
zephyrproject-rtos · Dec 22, 2023 · 6a666a6 · 6a666a6
1 parent 05867dc
commit 6a666a6
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/subsys/net/ip/ipv4.c b/subsys/net/ip/ipv4.c
@@ -272,6 +272,11 @@ enum net_verdict net_ipv4_input(struct net_pkt *pkt, bool is_loopback)
 			NET_DBG("DROP: localhost packet");
 			goto drop;
 		}
+
+		if (net_ipv4_is_my_addr(&hdr->src)) {
+			NET_DBG("DROP: src addr is %s", "mine");
+			goto drop;
+		}
 	}
 
 	if (net_ipv4_is_addr_mcast(&hdr->src)) {