v4.19.13 snapshot.
diff --git a/include/linux/atalk.h b/include/linux/atalk.h
new file mode 100644
index 0000000..23f8055
--- /dev/null
+++ b/include/linux/atalk.h
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_ATALK_H__
+#define __LINUX_ATALK_H__
+
+
+#include <net/sock.h>
+#include <uapi/linux/atalk.h>
+
+struct atalk_route {
+ struct net_device *dev;
+ struct atalk_addr target;
+ struct atalk_addr gateway;
+ int flags;
+ struct atalk_route *next;
+};
+
+/**
+ * struct atalk_iface - AppleTalk Interface
+ * @dev - Network device associated with this interface
+ * @address - Our address
+ * @status - What are we doing?
+ * @nets - Associated direct netrange
+ * @next - next element in the list of interfaces
+ */
+struct atalk_iface {
+ struct net_device *dev;
+ struct atalk_addr address;
+ int status;
+#define ATIF_PROBE 1 /* Probing for an address */
+#define ATIF_PROBE_FAIL 2 /* Probe collided */
+ struct atalk_netrange nets;
+ struct atalk_iface *next;
+};
+
+struct atalk_sock {
+ /* struct sock has to be the first member of atalk_sock */
+ struct sock sk;
+ __be16 dest_net;
+ __be16 src_net;
+ unsigned char dest_node;
+ unsigned char src_node;
+ unsigned char dest_port;
+ unsigned char src_port;
+};
+
+static inline struct atalk_sock *at_sk(struct sock *sk)
+{
+ return (struct atalk_sock *)sk;
+}
+
+struct ddpehdr {
+ __be16 deh_len_hops; /* lower 10 bits are length, next 4 - hops */
+ __be16 deh_sum;
+ __be16 deh_dnet;
+ __be16 deh_snet;
+ __u8 deh_dnode;
+ __u8 deh_snode;
+ __u8 deh_dport;
+ __u8 deh_sport;
+ /* And netatalk apps expect to stick the type in themselves */
+};
+
+static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
+{
+ return (struct ddpehdr *)skb_transport_header(skb);
+}
+
+/* AppleTalk AARP headers */
+struct elapaarp {
+ __be16 hw_type;
+#define AARP_HW_TYPE_ETHERNET 1
+#define AARP_HW_TYPE_TOKENRING 2
+ __be16 pa_type;
+ __u8 hw_len;
+ __u8 pa_len;
+#define AARP_PA_ALEN 4
+ __be16 function;
+#define AARP_REQUEST 1
+#define AARP_REPLY 2
+#define AARP_PROBE 3
+ __u8 hw_src[ETH_ALEN];
+ __u8 pa_src_zero;
+ __be16 pa_src_net;
+ __u8 pa_src_node;
+ __u8 hw_dst[ETH_ALEN];
+ __u8 pa_dst_zero;
+ __be16 pa_dst_net;
+ __u8 pa_dst_node;
+} __attribute__ ((packed));
+
+static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
+{
+ return (struct elapaarp *)skb_transport_header(skb);
+}
+
+/* Not specified - how long till we drop a resolved entry */
+#define AARP_EXPIRY_TIME (5 * 60 * HZ)
+/* Size of hash table */
+#define AARP_HASH_SIZE 16
+/* Fast retransmission timer when resolving */
+#define AARP_TICK_TIME (HZ / 5)
+/* Send 10 requests then give up (2 seconds) */
+#define AARP_RETRANSMIT_LIMIT 10
+/*
+ * Some value bigger than total retransmit time + a bit for last reply to
+ * appear and to stop continual requests
+ */
+#define AARP_RESOLVE_TIME (10 * HZ)
+
+extern struct datalink_proto *ddp_dl, *aarp_dl;
+extern void aarp_proto_init(void);
+
+/* Inter module exports */
+
+/* Give a device find its atif control structure */
+#if IS_ENABLED(CONFIG_IRDA) || IS_ENABLED(CONFIG_ATALK)
+static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
+{
+ return dev->atalk_ptr;
+}
+#endif
+
+extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
+extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
+extern int aarp_send_ddp(struct net_device *dev,
+ struct sk_buff *skb,
+ struct atalk_addr *sa, void *hwaddr);
+extern void aarp_device_down(struct net_device *dev);
+extern void aarp_probe_network(struct atalk_iface *atif);
+extern int aarp_proxy_probe_network(struct atalk_iface *atif,
+ struct atalk_addr *sa);
+extern void aarp_proxy_remove(struct net_device *dev,
+ struct atalk_addr *sa);
+
+extern void aarp_cleanup_module(void);
+
+extern struct hlist_head atalk_sockets;
+extern rwlock_t atalk_sockets_lock;
+
+extern struct atalk_route *atalk_routes;
+extern rwlock_t atalk_routes_lock;
+
+extern struct atalk_iface *atalk_interfaces;
+extern rwlock_t atalk_interfaces_lock;
+
+extern struct atalk_route atrtr_default;
+
+struct aarp_iter_state {
+ int bucket;
+ struct aarp_entry **table;
+};
+
+extern const struct seq_operations aarp_seq_ops;
+
+extern int sysctl_aarp_expiry_time;
+extern int sysctl_aarp_tick_time;
+extern int sysctl_aarp_retransmit_limit;
+extern int sysctl_aarp_resolve_time;
+
+#ifdef CONFIG_SYSCTL
+extern void atalk_register_sysctl(void);
+extern void atalk_unregister_sysctl(void);
+#else
+#define atalk_register_sysctl() do { } while(0)
+#define atalk_unregister_sysctl() do { } while(0)
+#endif
+
+#ifdef CONFIG_PROC_FS
+extern int atalk_proc_init(void);
+extern void atalk_proc_exit(void);
+#else
+#define atalk_proc_init() ({ 0; })
+#define atalk_proc_exit() do { } while(0)
+#endif /* CONFIG_PROC_FS */
+
+#endif /* __LINUX_ATALK_H__ */