diff --git a/libc/kernel/uapi/linux/icmp.h b/libc/kernel/uapi/linux/icmp.h
index 5892d12..d8c089c 100644
--- a/libc/kernel/uapi/linux/icmp.h
+++ b/libc/kernel/uapi/linux/icmp.h
@@ -20,6 +20,9 @@
 #define _UAPI_LINUX_ICMP_H
 #include <linux/types.h>
 #include <asm/byteorder.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/in6.h>
 #define ICMP_ECHOREPLY 0
 #define ICMP_DEST_UNREACH 3
 #define ICMP_SOURCE_QUENCH 4
@@ -57,6 +60,20 @@
 #define ICMP_REDIR_HOSTTOS 3
 #define ICMP_EXC_TTL 0
 #define ICMP_EXC_FRAGTIME 1
+#define ICMP_EXT_ECHO 42
+#define ICMP_EXT_ECHOREPLY 43
+#define ICMP_EXT_CODE_MAL_QUERY 1
+#define ICMP_EXT_CODE_NO_IF 2
+#define ICMP_EXT_CODE_NO_TABLE_ENT 3
+#define ICMP_EXT_CODE_MULT_IFS 4
+#define ICMP_EXT_ECHOREPLY_ACTIVE (1 << 2)
+#define ICMP_EXT_ECHOREPLY_IPV4 (1 << 1)
+#define ICMP_EXT_ECHOREPLY_IPV6 1
+#define ICMP_EXT_ECHO_CTYPE_NAME 1
+#define ICMP_EXT_ECHO_CTYPE_INDEX 2
+#define ICMP_EXT_ECHO_CTYPE_ADDR 3
+#define ICMP_AFI_IP 1
+#define ICMP_AFI_IP6 2
 struct icmphdr {
   __u8 type;
   __u8 code;
@@ -94,4 +111,23 @@
   __u8 class_num;
   __u8 class_type;
 };
+struct icmp_ext_echo_ctype3_hdr {
+  __be16 afi;
+  __u8 addrlen;
+  __u8 reserved;
+};
+struct icmp_ext_echo_iio {
+  struct icmp_extobj_hdr extobj_hdr;
+  union {
+    char name[IFNAMSIZ];
+    __be32 ifindex;
+    struct {
+      struct icmp_ext_echo_ctype3_hdr ctype3_hdr;
+      union {
+        struct in_addr ipv4_addr;
+        struct in6_addr ipv6_addr;
+      } ip_addr;
+    } addr;
+  } ident;
+};
 #endif