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 
9 struct 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  */
25 struct 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 
35 struct 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 
at_sk(struct sock * sk)46 static inline struct atalk_sock *at_sk(struct sock *sk)
47 {
48 	return (struct atalk_sock *)sk;
49 }
50 
51 struct 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 
ddp_hdr(struct sk_buff * skb)63 static __inline__ struct ddpehdr *ddp_hdr(struct sk_buff *skb)
64 {
65 	return (struct ddpehdr *)skb_transport_header(skb);
66 }
67 
68 /* AppleTalk AARP headers */
69 struct 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 
aarp_hdr(struct sk_buff * skb)91 static __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 
110 extern struct datalink_proto *ddp_dl, *aarp_dl;
111 extern 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)
atalk_find_dev(struct net_device * dev)117 static inline struct atalk_iface *atalk_find_dev(struct net_device *dev)
118 {
119 	return dev->atalk_ptr;
120 }
121 #endif
122 
123 extern struct atalk_addr *atalk_find_dev_addr(struct net_device *dev);
124 extern struct net_device *atrtr_get_dev(struct atalk_addr *sa);
125 extern int		 aarp_send_ddp(struct net_device *dev,
126 				       struct sk_buff *skb,
127 				       struct atalk_addr *sa, void *hwaddr);
128 extern void		 aarp_device_down(struct net_device *dev);
129 extern void		 aarp_probe_network(struct atalk_iface *atif);
130 extern int 		 aarp_proxy_probe_network(struct atalk_iface *atif,
131 				     struct atalk_addr *sa);
132 extern void		 aarp_proxy_remove(struct net_device *dev,
133 					   struct atalk_addr *sa);
134 
135 extern void		aarp_cleanup_module(void);
136 
137 extern struct hlist_head atalk_sockets;
138 extern rwlock_t atalk_sockets_lock;
139 
140 extern struct atalk_route *atalk_routes;
141 extern rwlock_t atalk_routes_lock;
142 
143 extern struct atalk_iface *atalk_interfaces;
144 extern rwlock_t atalk_interfaces_lock;
145 
146 extern struct atalk_route atrtr_default;
147 
148 struct aarp_iter_state {
149 	int bucket;
150 	struct aarp_entry **table;
151 };
152 
153 extern const struct seq_operations aarp_seq_ops;
154 
155 extern int sysctl_aarp_expiry_time;
156 extern int sysctl_aarp_tick_time;
157 extern int sysctl_aarp_retransmit_limit;
158 extern int sysctl_aarp_resolve_time;
159 
160 #ifdef CONFIG_SYSCTL
161 extern int atalk_register_sysctl(void);
162 extern void atalk_unregister_sysctl(void);
163 #else
atalk_register_sysctl(void)164 static inline int atalk_register_sysctl(void)
165 {
166 	return 0;
167 }
atalk_unregister_sysctl(void)168 static inline void atalk_unregister_sysctl(void)
169 {
170 }
171 #endif
172 
173 #ifdef CONFIG_PROC_FS
174 extern int atalk_proc_init(void);
175 extern void atalk_proc_exit(void);
176 #else
atalk_proc_init(void)177 static inline int atalk_proc_init(void)
178 {
179 	return 0;
180 }
atalk_proc_exit(void)181 static inline void atalk_proc_exit(void)
182 {
183 }
184 #endif /* CONFIG_PROC_FS */
185 
186 #endif /* __LINUX_ATALK_H__ */
187