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/* 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;
__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) */
* 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 */
static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
return dev->atalk_ptr;
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;
extern void atalk_register_sysctl(void);
extern void atalk_unregister_sysctl(void);
#define atalk_register_sysctl() do { } while(0)
#define atalk_unregister_sysctl() do { } while(0)
extern int atalk_proc_init(void);
extern void atalk_proc_exit(void);
#define atalk_proc_init() ({ 0; })
#define atalk_proc_exit() do { } while(0)
#endif /* CONFIG_PROC_FS */
#endif /* __LINUX_ATALK_H__ */