Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License, or | |
5 | * (at your option) any later version. | |
6 | * | |
7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | */ | |
1da177e4 LT |
9 | #include <linux/errno.h> |
10 | #include <linux/types.h> | |
11 | #include <linux/socket.h> | |
12 | #include <linux/in.h> | |
13 | #include <linux/kernel.h> | |
70868eac | 14 | #include <linux/module.h> |
1da177e4 LT |
15 | #include <linux/spinlock.h> |
16 | #include <linux/timer.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/sockios.h> | |
19 | #include <linux/net.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <net/ax25.h> |
22 | #include <linux/inet.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/sock.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/interrupt.h> | |
31 | ||
8d5cf596 | 32 | static struct ax25_protocol *protocol_list; |
1da177e4 LT |
33 | static DEFINE_RWLOCK(protocol_list_lock); |
34 | ||
a4282717 | 35 | static HLIST_HEAD(ax25_linkfail_list); |
1da177e4 LT |
36 | static DEFINE_SPINLOCK(linkfail_lock); |
37 | ||
38 | static struct listen_struct { | |
39 | struct listen_struct *next; | |
40 | ax25_address callsign; | |
41 | struct net_device *dev; | |
42 | } *listen_list = NULL; | |
43 | static DEFINE_SPINLOCK(listen_lock); | |
44 | ||
8d5cf596 RB |
45 | /* |
46 | * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT, | |
47 | * AX25_P_IP or AX25_P_ARP ... | |
48 | */ | |
49 | void ax25_register_pid(struct ax25_protocol *ap) | |
1da177e4 | 50 | { |
95ff9f4d | 51 | write_lock_bh(&protocol_list_lock); |
8d5cf596 RB |
52 | ap->next = protocol_list; |
53 | protocol_list = ap; | |
95ff9f4d | 54 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
55 | } |
56 | ||
8d5cf596 | 57 | EXPORT_SYMBOL_GPL(ax25_register_pid); |
70868eac | 58 | |
1da177e4 LT |
59 | void ax25_protocol_release(unsigned int pid) |
60 | { | |
8d5cf596 | 61 | struct ax25_protocol *s, *protocol; |
1da177e4 | 62 | |
95ff9f4d | 63 | write_lock_bh(&protocol_list_lock); |
1da177e4 | 64 | protocol = protocol_list; |
910d30b7 IJ |
65 | if (protocol == NULL) |
66 | goto out; | |
1da177e4 LT |
67 | |
68 | if (protocol->pid == pid) { | |
69 | protocol_list = protocol->next; | |
910d30b7 | 70 | goto out; |
1da177e4 LT |
71 | } |
72 | ||
73 | while (protocol != NULL && protocol->next != NULL) { | |
74 | if (protocol->next->pid == pid) { | |
75 | s = protocol->next; | |
76 | protocol->next = protocol->next->next; | |
910d30b7 | 77 | goto out; |
1da177e4 LT |
78 | } |
79 | ||
80 | protocol = protocol->next; | |
81 | } | |
910d30b7 | 82 | out: |
95ff9f4d | 83 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
84 | } |
85 | ||
70868eac RB |
86 | EXPORT_SYMBOL(ax25_protocol_release); |
87 | ||
a4282717 | 88 | void ax25_linkfail_register(struct ax25_linkfail *lf) |
1da177e4 | 89 | { |
1da177e4 | 90 | spin_lock_bh(&linkfail_lock); |
a4282717 | 91 | hlist_add_head(&lf->lf_node, &ax25_linkfail_list); |
1da177e4 | 92 | spin_unlock_bh(&linkfail_lock); |
1da177e4 LT |
93 | } |
94 | ||
70868eac RB |
95 | EXPORT_SYMBOL(ax25_linkfail_register); |
96 | ||
a4282717 | 97 | void ax25_linkfail_release(struct ax25_linkfail *lf) |
1da177e4 | 98 | { |
1da177e4 | 99 | spin_lock_bh(&linkfail_lock); |
a4282717 | 100 | hlist_del_init(&lf->lf_node); |
1da177e4 LT |
101 | spin_unlock_bh(&linkfail_lock); |
102 | } | |
103 | ||
70868eac RB |
104 | EXPORT_SYMBOL(ax25_linkfail_release); |
105 | ||
1da177e4 LT |
106 | int ax25_listen_register(ax25_address *callsign, struct net_device *dev) |
107 | { | |
108 | struct listen_struct *listen; | |
109 | ||
110 | if (ax25_listen_mine(callsign, dev)) | |
111 | return 0; | |
112 | ||
113 | if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) | |
81dcd169 | 114 | return -ENOMEM; |
1da177e4 LT |
115 | |
116 | listen->callsign = *callsign; | |
117 | listen->dev = dev; | |
118 | ||
119 | spin_lock_bh(&listen_lock); | |
120 | listen->next = listen_list; | |
121 | listen_list = listen; | |
122 | spin_unlock_bh(&listen_lock); | |
123 | ||
81dcd169 | 124 | return 0; |
1da177e4 LT |
125 | } |
126 | ||
70868eac RB |
127 | EXPORT_SYMBOL(ax25_listen_register); |
128 | ||
1da177e4 LT |
129 | void ax25_listen_release(ax25_address *callsign, struct net_device *dev) |
130 | { | |
131 | struct listen_struct *s, *listen; | |
132 | ||
133 | spin_lock_bh(&listen_lock); | |
134 | listen = listen_list; | |
135 | if (listen == NULL) { | |
136 | spin_unlock_bh(&listen_lock); | |
137 | return; | |
138 | } | |
139 | ||
140 | if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { | |
141 | listen_list = listen->next; | |
142 | spin_unlock_bh(&listen_lock); | |
143 | kfree(listen); | |
144 | return; | |
145 | } | |
146 | ||
147 | while (listen != NULL && listen->next != NULL) { | |
148 | if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { | |
149 | s = listen->next; | |
150 | listen->next = listen->next->next; | |
151 | spin_unlock_bh(&listen_lock); | |
152 | kfree(s); | |
153 | return; | |
154 | } | |
155 | ||
156 | listen = listen->next; | |
157 | } | |
158 | spin_unlock_bh(&listen_lock); | |
159 | } | |
160 | ||
70868eac RB |
161 | EXPORT_SYMBOL(ax25_listen_release); |
162 | ||
1da177e4 LT |
163 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) |
164 | { | |
165 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; | |
8d5cf596 | 166 | struct ax25_protocol *protocol; |
1da177e4 LT |
167 | |
168 | read_lock(&protocol_list_lock); | |
169 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) | |
170 | if (protocol->pid == pid) { | |
171 | res = protocol->func; | |
172 | break; | |
173 | } | |
174 | read_unlock(&protocol_list_lock); | |
175 | ||
176 | return res; | |
177 | } | |
178 | ||
179 | int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) | |
180 | { | |
181 | struct listen_struct *listen; | |
182 | ||
183 | spin_lock_bh(&listen_lock); | |
184 | for (listen = listen_list; listen != NULL; listen = listen->next) | |
81dcd169 RB |
185 | if (ax25cmp(&listen->callsign, callsign) == 0 && |
186 | (listen->dev == dev || listen->dev == NULL)) { | |
1da177e4 LT |
187 | spin_unlock_bh(&listen_lock); |
188 | return 1; | |
189 | } | |
190 | spin_unlock_bh(&listen_lock); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | void ax25_link_failed(ax25_cb *ax25, int reason) | |
196 | { | |
a4282717 RB |
197 | struct ax25_linkfail *lf; |
198 | struct hlist_node *node; | |
1da177e4 LT |
199 | |
200 | spin_lock_bh(&linkfail_lock); | |
a4282717 RB |
201 | hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node) |
202 | lf->func(ax25, reason); | |
1da177e4 LT |
203 | spin_unlock_bh(&linkfail_lock); |
204 | } | |
205 | ||
206 | int ax25_protocol_is_registered(unsigned int pid) | |
207 | { | |
8d5cf596 | 208 | struct ax25_protocol *protocol; |
1da177e4 LT |
209 | int res = 0; |
210 | ||
95ff9f4d | 211 | read_lock_bh(&protocol_list_lock); |
1da177e4 LT |
212 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
213 | if (protocol->pid == pid) { | |
214 | res = 1; | |
215 | break; | |
216 | } | |
95ff9f4d | 217 | read_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
218 | |
219 | return res; | |
220 | } |