1 files changed, 38 insertions, 0 deletions
diff --git a/net/lwip/icmp_unreach.c b/net/lwip/icmp_unreach.c
new file mode 100644
index 00000000000..9e8a05f5717
--- /dev/null
+++ b/net/lwip/icmp_unreach.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2025 Linaro Ltd. */
+
+#include <lwip/icmp.h>
+#include <lwip/ip4_addr.h>
+#include <lwip/pbuf.h>
+#include <lwip/prot/ip4.h>
+
+static const char *code_to_str(int code)
+{
+	switch (code) {
+	case ICMP_DUR_NET:
+		return "network unreachable";
+	case ICMP_DUR_HOST:
+		return "host unreachable";
+	case ICMP_DUR_PROTO:
+		return "protocol unreachable";
+	case ICMP_DUR_PORT:
+		return "port unreachable";
+	case ICMP_DUR_FRAG:
+		return "fragmentation needed and DF set";
+	case ICMP_DUR_SR:
+		return "source route failed";
+	default:
+		break;
+	}
+	return "unknown cause";
+}
+
+void net_lwip_icmp_dest_unreach(int code, struct pbuf *p)
+{
+	struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
+	ip4_addr_t src;
+
+	ip4_addr_copy(src, iphdr->src);
+	printf("ICMP destination unreachable (%s) from %s\n",
+	       code_to_str(code), ip4addr_ntoa(&src));
+}