v4.19.13 snapshot.
diff --git a/include/linux/icmpv6.h b/include/linux/icmpv6.h
new file mode 100644
index 0000000..a8f8889
--- /dev/null
+++ b/include/linux/icmpv6.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_ICMPV6_H
+#define _LINUX_ICMPV6_H
+
+#include <linux/skbuff.h>
+#include <uapi/linux/icmpv6.h>
+
+static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
+{
+ return (struct icmp6hdr *)skb_transport_header(skb);
+}
+
+#include <linux/netdevice.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info);
+
+typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info,
+ const struct in6_addr *force_saddr);
+extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
+extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
+int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
+ unsigned int data_len);
+
+#else
+
+static inline void icmpv6_send(struct sk_buff *skb,
+ u8 type, u8 code, __u32 info)
+{
+
+}
+#endif
+
+extern int icmpv6_init(void);
+extern int icmpv6_err_convert(u8 type, u8 code,
+ int *err);
+extern void icmpv6_cleanup(void);
+extern void icmpv6_param_prob(struct sk_buff *skb,
+ u8 code, int pos);
+
+struct flowi6;
+struct in6_addr;
+extern void icmpv6_flow_init(struct sock *sk,
+ struct flowi6 *fl6,
+ u8 type,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int oif);
+#endif