v4.19.13 snapshot.
diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h
new file mode 100644
index 0000000..15fe980
--- /dev/null
+++ b/include/linux/sock_diag.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SOCK_DIAG_H__
+#define __SOCK_DIAG_H__
+
+#include <linux/netlink.h>
+#include <linux/user_namespace.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <uapi/linux/sock_diag.h>
+
+struct sk_buff;
+struct nlmsghdr;
+struct sock;
+
+struct sock_diag_handler {
+ __u8 family;
+ int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
+ int (*get_info)(struct sk_buff *skb, struct sock *sk);
+ int (*destroy)(struct sk_buff *skb, struct nlmsghdr *nlh);
+};
+
+int sock_diag_register(const struct sock_diag_handler *h);
+void sock_diag_unregister(const struct sock_diag_handler *h);
+
+void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));
+void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh));
+
+u64 sock_gen_cookie(struct sock *sk);
+int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie);
+void sock_diag_save_cookie(struct sock *sk, __u32 *cookie);
+
+int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
+int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
+ struct sk_buff *skb, int attrtype);
+
+static inline
+enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
+{
+ switch (sk->sk_family) {
+ case AF_INET:
+ if (sk->sk_type == SOCK_RAW)
+ return SKNLGRP_NONE;
+
+ switch (sk->sk_protocol) {
+ case IPPROTO_TCP:
+ return SKNLGRP_INET_TCP_DESTROY;
+ case IPPROTO_UDP:
+ return SKNLGRP_INET_UDP_DESTROY;
+ default:
+ return SKNLGRP_NONE;
+ }
+ case AF_INET6:
+ if (sk->sk_type == SOCK_RAW)
+ return SKNLGRP_NONE;
+
+ switch (sk->sk_protocol) {
+ case IPPROTO_TCP:
+ return SKNLGRP_INET6_TCP_DESTROY;
+ case IPPROTO_UDP:
+ return SKNLGRP_INET6_UDP_DESTROY;
+ default:
+ return SKNLGRP_NONE;
+ }
+ default:
+ return SKNLGRP_NONE;
+ }
+}
+
+static inline
+bool sock_diag_has_destroy_listeners(const struct sock *sk)
+{
+ const struct net *n = sock_net(sk);
+ const enum sknetlink_groups group = sock_diag_destroy_group(sk);
+
+ return group != SKNLGRP_NONE && n->diag_nlsk &&
+ netlink_has_listeners(n->diag_nlsk, group);
+}
+void sock_diag_broadcast_destroy(struct sock *sk);
+
+int sock_diag_destroy(struct sock *sk, int err);
+#endif