v4.19.13 snapshot.
diff --git a/include/net/protocol.h b/include/net/protocol.h
new file mode 100644
index 0000000..4fc75f7
--- /dev/null
+++ b/include/net/protocol.h
@@ -0,0 +1,120 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for the protocol dispatcher.
+ *
+ * Version: @(#)protocol.h 1.0.2 05/07/93
+ *
+ * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ * Alan Cox : Added a name field and a frag handler
+ * field for later.
+ * Alan Cox : Cleaned up, and sorted types.
+ * Pedro Roque : inet6 protocols
+ */
+
+#ifndef _PROTOCOL_H
+#define _PROTOCOL_H
+
+#include <linux/in6.h>
+#include <linux/skbuff.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/ipv6.h>
+#endif
+#include <linux/netdevice.h>
+
+/* This is one larger than the largest protocol value that can be
+ * found in an ipv4 or ipv6 header. Since in both cases the protocol
+ * value is presented in a __u8, this is defined to be 256.
+ */
+#define MAX_INET_PROTOS 256
+
+/* This is used to register protocols. */
+struct net_protocol {
+ int (*early_demux)(struct sk_buff *skb);
+ int (*early_demux_handler)(struct sk_buff *skb);
+ int (*handler)(struct sk_buff *skb);
+ void (*err_handler)(struct sk_buff *skb, u32 info);
+ unsigned int no_policy:1,
+ netns_ok:1,
+ /* does the protocol do more stringent
+ * icmp tag validation than simple
+ * socket lookup?
+ */
+ icmp_strict_tag_validation:1;
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+struct inet6_protocol {
+ void (*early_demux)(struct sk_buff *skb);
+ void (*early_demux_handler)(struct sk_buff *skb);
+ int (*handler)(struct sk_buff *skb);
+
+ void (*err_handler)(struct sk_buff *skb,
+ struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset,
+ __be32 info);
+ unsigned int flags; /* INET6_PROTO_xxx */
+};
+
+#define INET6_PROTO_NOPOLICY 0x1
+#define INET6_PROTO_FINAL 0x2
+#endif
+
+struct net_offload {
+ struct offload_callbacks callbacks;
+ unsigned int flags; /* Flags used by IPv6 for now */
+};
+/* This should be set for any extension header which is compatible with GSO. */
+#define INET6_PROTO_GSO_EXTHDR 0x1
+
+/* This is used to register socket interfaces for IP protocols. */
+struct inet_protosw {
+ struct list_head list;
+
+ /* These two fields form the lookup key. */
+ unsigned short type; /* This is the 2nd argument to socket(2). */
+ unsigned short protocol; /* This is the L4 protocol number. */
+
+ struct proto *prot;
+ const struct proto_ops *ops;
+
+ unsigned char flags; /* See INET_PROTOSW_* below. */
+};
+#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
+#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
+#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
+
+extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
+extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
+extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
+
+#if IS_ENABLED(CONFIG_IPV6)
+extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
+#endif
+
+int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
+int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
+int inet_add_offload(const struct net_offload *prot, unsigned char num);
+int inet_del_offload(const struct net_offload *prot, unsigned char num);
+void inet_register_protosw(struct inet_protosw *p);
+void inet_unregister_protosw(struct inet_protosw *p);
+
+#if IS_ENABLED(CONFIG_IPV6)
+int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
+int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
+int inet6_register_protosw(struct inet_protosw *p);
+void inet6_unregister_protosw(struct inet_protosw *p);
+#endif
+int inet6_add_offload(const struct net_offload *prot, unsigned char num);
+int inet6_del_offload(const struct net_offload *prot, unsigned char num);
+
+#endif /* _PROTOCOL_H */