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
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
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
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)
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
164 static inline int atalk_register_sysctl(void)
165 {
166 return 0;
167 }
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
177 static inline int atalk_proc_init(void)
178 {
179 return 0;
180 }
181 static inline void atalk_proc_exit(void)
182 {
183 }
184 #endif /* CONFIG_PROC_FS */
185
186 #endif /* __LINUX_ATALK_H__ */
187
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