net: ipv6: Check that received src address is not mine

jukkar · cfriedt · commit 652b7f6f83c5 · 2024-01-09T12:55:32.000-05:00
Drop received packet if the source address is the same as the device address. Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no> (cherry picked from commit 8d3d48e)
diff --git a/subsys/net/ip/ipv6.c b/subsys/net/ip/ipv6.c
@@ -488,6 +488,11 @@ enum net_verdict net_ipv6_input(struct net_pkt *pkt, bool is_loopback)
 			NET_DBG("DROP: invalid scope multicast packet");
 			goto drop;
 		}
+
+		if (net_ipv6_is_my_addr(&hdr->src)) {
+			NET_DBG("DROP: src addr is %s", "mine");
+			goto drop;
+		}
 	}
 
 	/* Check extension headers */

Original file line number	Diff line number	Diff line change
`@@ -488,6 +488,11 @@ enum net_verdict net_ipv6_input(struct net_pkt *pkt, bool is_loopback)`
`488`	`488`	`NET_DBG("DROP: invalid scope multicast packet");`
`489`	`489`	`goto drop;`
`490`	`490`	`}`
	`491`	`+`
	`492`	`+ if (net_ipv6_is_my_addr(&hdr->src)) {`
	`493`	`+ NET_DBG("DROP: src addr is %s", "mine");`
	`494`	`+ goto drop;`
	`495`	`+ }`
`491`	`496`	`}`
`492`	`497`
`493`	`498`	`/* Check extension headers */`