atalk.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __LINUX_ATALK_H__
  3#define __LINUX_ATALK_H__
  4
  5
  6#include <net/sock.h>
  7#include <uapi/linux/atalk.h>
  8
  9struct atalk_route {
 10	struct net_device  *dev;
 11	struct atalk_addr  target;
 12	struct atalk_addr  gateway;
 13	int		   flags;
 14	struct atalk_route *next;
 15};
 16
 17/**
 18 *	struct atalk_iface - AppleTalk Interface
 19 *	@dev - Network device associated with this interface
 20 *	@address - Our address
 21 *	@status - What are we doing?
 22 *	@nets - Associated direct netrange
 23 *	@next - next element in the list of interfaces
 24 */
 25struct atalk_iface {
 26	struct net_device	*dev;
 27	struct atalk_addr	address;
 28	int			status;
 29#define ATIF_PROBE	1		/* Probing for an address */
 30#define ATIF_PROBE_FAIL	2		/* Probe collided */
 31	struct atalk_netrange	nets;
 32	struct atalk_iface	*next;
 33};
 34	
 35struct atalk_sock {
 36	/* struct sock has to be the first member of atalk_sock */
 37	struct sock	sk;
 38	__be16		dest_net;
 39	__be16		src_net;
 40	unsigned char	dest_node;
 41	unsigned char	src_node;
 42	unsigned char	dest_port;
 43	unsigned char	src_port;
 44};
 45
 46static inline struct atalk_sock *at_sk(struct sock *sk)
 47{
 48	return (struct atalk_sock *)sk;
 49}
 50
 51struct ddpehdr {
 52	__be16	deh_len_hops;	/* lower 10 bits are length, next 4 - hops */
 53	__be16	deh_sum;
 54	__be16	deh_dnet;
 55	__be16	deh_snet;
 56	__u8	deh_dnode;
 57	__u8	deh_snode;
 58	__u8	deh_dport;
 59	__u8	deh_sport;
 60	/* And netatalk apps expect to stick the type in themselves */
 61};
 62
 63static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
 64{
 65	return (struct ddpehdr *)skb_transport_header(skb);
 66}
 67
 68/* AppleTalk AARP headers */
 69struct elapaarp {
 70	__be16	hw_type;
 71#define AARP_HW_TYPE_ETHERNET		1
 72#define AARP_HW_TYPE_TOKENRING		2
 73	__be16	pa_type;
 74	__u8	hw_len;
 75	__u8	pa_len;
 76#define AARP_PA_ALEN			4
 77	__be16	function;
 78#define AARP_REQUEST			1
 79#define AARP_REPLY			2
 80#define AARP_PROBE			3
 81	__u8	hw_src[ETH_ALEN];
 82	__u8	pa_src_zero;
 83	__be16	pa_src_net;
 84	__u8	pa_src_node;
 85	__u8	hw_dst[ETH_ALEN];
 86	__u8	pa_dst_zero;
 87	__be16	pa_dst_net;
 88	__u8	pa_dst_node;
 89} __attribute__ ((packed));
 90
 91static __inline__ struct elapaarp *aarp_hdr(struct sk_buff *skb)
 92{
 93	return (struct elapaarp *)skb_transport_header(skb);
 94}
 95
 96/* Not specified - how long till we drop a resolved entry */
 97#define AARP_EXPIRY_TIME	(5 * 60 * HZ)
 98/* Size of hash table */
 99#define AARP_HASH_SIZE		16
100/* Fast retransmission timer when resolving */
101#define AARP_TICK_TIME		(HZ / 5)
102/* Send 10 requests then give up (2 seconds) */
103#define AARP_RETRANSMIT_LIMIT	10
104/*
105 * Some value bigger than total retransmit time + a bit for last reply to
106 * appear and to stop continual requests
107 */
108#define AARP_RESOLVE_TIME	(10 * HZ)
109
110extern struct datalink_proto *ddp_dl, *aarp_dl;
111extern int aarp_proto_init(void);
112
113/* Inter module exports */
114
115/* Give a device find its atif control structure */
116#if IS_ENABLED(CONFIG_ATALK)
117static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
118{
119	return dev->atalk_ptr;
120}
121#endif
122
123extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
124extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
125extern int		 aarp_send_ddp(struct net_device *dev,
126				       struct sk_buff *skb,
127				       struct atalk_addr *sa, void *hwaddr);
128extern void		 aarp_device_down(struct net_device *dev);
129extern void		 aarp_probe_network(struct atalk_iface *atif);
130extern int 		 aarp_proxy_probe_network(struct atalk_iface *atif,
131				     struct atalk_addr *sa);
132extern void		 aarp_proxy_remove(struct net_device *dev,
133					   struct atalk_addr *sa);
134
135extern void		aarp_cleanup_module(void);
136
137extern struct hlist_head atalk_sockets;
138extern rwlock_t atalk_sockets_lock;
139
140extern struct atalk_route *atalk_routes;
141extern rwlock_t atalk_routes_lock;
142
143extern struct atalk_iface *atalk_interfaces;
144extern rwlock_t atalk_interfaces_lock;
145
146extern struct atalk_route atrtr_default;
147
148struct aarp_iter_state {
149	int bucket;
150	struct aarp_entry **table;
151};
152
153extern const struct seq_operations aarp_seq_ops;
154
155extern int sysctl_aarp_expiry_time;
156extern int sysctl_aarp_tick_time;
157extern int sysctl_aarp_retransmit_limit;
158extern int sysctl_aarp_resolve_time;
159
160#ifdef CONFIG_SYSCTL
161extern int atalk_register_sysctl(void);
162extern void atalk_unregister_sysctl(void);
163#else
164static inline int atalk_register_sysctl(void)
165{
166	return 0;
167}
168static inline void atalk_unregister_sysctl(void)
169{
170}
171#endif
172
173#ifdef CONFIG_PROC_FS
174extern int atalk_proc_init(void);
175extern void atalk_proc_exit(void);
176#else
177static inline int atalk_proc_init(void)
178{
179	return 0;
180}
181static inline void atalk_proc_exit(void)
182{
183}
184#endif /* CONFIG_PROC_FS */
185
186#endif /* __LINUX_ATALK_H__ */