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> | |
20 | #include <net/ax25.h> | |
21 | #include <linux/inet.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <net/sock.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/system.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
30 | ||
8d5cf596 | 31 | static struct ax25_protocol *protocol_list; |
1da177e4 LT |
32 | static DEFINE_RWLOCK(protocol_list_lock); |
33 | ||
a4282717 | 34 | static HLIST_HEAD(ax25_linkfail_list); |
1da177e4 LT |
35 | static DEFINE_SPINLOCK(linkfail_lock); |
36 | ||
37 | static struct listen_struct { | |
38 | struct listen_struct *next; | |
39 | ax25_address callsign; | |
40 | struct net_device *dev; | |
41 | } *listen_list = NULL; | |
42 | static DEFINE_SPINLOCK(listen_lock); | |
43 | ||
8d5cf596 RB |
44 | /* |
45 | * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT, | |
46 | * AX25_P_IP or AX25_P_ARP ... | |
47 | */ | |
48 | void ax25_register_pid(struct ax25_protocol *ap) | |
1da177e4 | 49 | { |
95ff9f4d | 50 | write_lock_bh(&protocol_list_lock); |
8d5cf596 RB |
51 | ap->next = protocol_list; |
52 | protocol_list = ap; | |
95ff9f4d | 53 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
54 | } |
55 | ||
8d5cf596 | 56 | EXPORT_SYMBOL_GPL(ax25_register_pid); |
70868eac | 57 | |
1da177e4 LT |
58 | void ax25_protocol_release(unsigned int pid) |
59 | { | |
8d5cf596 | 60 | struct ax25_protocol *s, *protocol; |
1da177e4 | 61 | |
95ff9f4d | 62 | write_lock_bh(&protocol_list_lock); |
1da177e4 LT |
63 | protocol = protocol_list; |
64 | if (protocol == NULL) { | |
95ff9f4d | 65 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
66 | return; |
67 | } | |
68 | ||
69 | if (protocol->pid == pid) { | |
70 | protocol_list = protocol->next; | |
95ff9f4d | 71 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
72 | return; |
73 | } | |
74 | ||
75 | while (protocol != NULL && protocol->next != NULL) { | |
76 | if (protocol->next->pid == pid) { | |
77 | s = protocol->next; | |
78 | protocol->next = protocol->next->next; | |
95ff9f4d | 79 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
80 | return; |
81 | } | |
82 | ||
83 | protocol = protocol->next; | |
84 | } | |
95ff9f4d | 85 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
86 | } |
87 | ||
70868eac RB |
88 | EXPORT_SYMBOL(ax25_protocol_release); |
89 | ||
a4282717 | 90 | void ax25_linkfail_register(struct ax25_linkfail *lf) |
1da177e4 | 91 | { |
1da177e4 | 92 | spin_lock_bh(&linkfail_lock); |
a4282717 | 93 | hlist_add_head(&lf->lf_node, &ax25_linkfail_list); |
1da177e4 | 94 | spin_unlock_bh(&linkfail_lock); |
1da177e4 LT |
95 | } |
96 | ||
70868eac RB |
97 | EXPORT_SYMBOL(ax25_linkfail_register); |
98 | ||
a4282717 | 99 | void ax25_linkfail_release(struct ax25_linkfail *lf) |
1da177e4 | 100 | { |
1da177e4 | 101 | spin_lock_bh(&linkfail_lock); |
a4282717 | 102 | hlist_del_init(&lf->lf_node); |
1da177e4 LT |
103 | spin_unlock_bh(&linkfail_lock); |
104 | } | |
105 | ||
70868eac RB |
106 | EXPORT_SYMBOL(ax25_linkfail_release); |
107 | ||
1da177e4 LT |
108 | int ax25_listen_register(ax25_address *callsign, struct net_device *dev) |
109 | { | |
110 | struct listen_struct *listen; | |
111 | ||
112 | if (ax25_listen_mine(callsign, dev)) | |
113 | return 0; | |
114 | ||
115 | if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) | |
81dcd169 | 116 | return -ENOMEM; |
1da177e4 LT |
117 | |
118 | listen->callsign = *callsign; | |
119 | listen->dev = dev; | |
120 | ||
121 | spin_lock_bh(&listen_lock); | |
122 | listen->next = listen_list; | |
123 | listen_list = listen; | |
124 | spin_unlock_bh(&listen_lock); | |
125 | ||
81dcd169 | 126 | return 0; |
1da177e4 LT |
127 | } |
128 | ||
70868eac RB |
129 | EXPORT_SYMBOL(ax25_listen_register); |
130 | ||
1da177e4 LT |
131 | void ax25_listen_release(ax25_address *callsign, struct net_device *dev) |
132 | { | |
133 | struct listen_struct *s, *listen; | |
134 | ||
135 | spin_lock_bh(&listen_lock); | |
136 | listen = listen_list; | |
137 | if (listen == NULL) { | |
138 | spin_unlock_bh(&listen_lock); | |
139 | return; | |
140 | } | |
141 | ||
142 | if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { | |
143 | listen_list = listen->next; | |
144 | spin_unlock_bh(&listen_lock); | |
145 | kfree(listen); | |
146 | return; | |
147 | } | |
148 | ||
149 | while (listen != NULL && listen->next != NULL) { | |
150 | if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { | |
151 | s = listen->next; | |
152 | listen->next = listen->next->next; | |
153 | spin_unlock_bh(&listen_lock); | |
154 | kfree(s); | |
155 | return; | |
156 | } | |
157 | ||
158 | listen = listen->next; | |
159 | } | |
160 | spin_unlock_bh(&listen_lock); | |
161 | } | |
162 | ||
70868eac RB |
163 | EXPORT_SYMBOL(ax25_listen_release); |
164 | ||
1da177e4 LT |
165 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) |
166 | { | |
167 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; | |
8d5cf596 | 168 | struct ax25_protocol *protocol; |
1da177e4 LT |
169 | |
170 | read_lock(&protocol_list_lock); | |
171 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) | |
172 | if (protocol->pid == pid) { | |
173 | res = protocol->func; | |
174 | break; | |
175 | } | |
176 | read_unlock(&protocol_list_lock); | |
177 | ||
178 | return res; | |
179 | } | |
180 | ||
181 | int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) | |
182 | { | |
183 | struct listen_struct *listen; | |
184 | ||
185 | spin_lock_bh(&listen_lock); | |
186 | for (listen = listen_list; listen != NULL; listen = listen->next) | |
81dcd169 RB |
187 | if (ax25cmp(&listen->callsign, callsign) == 0 && |
188 | (listen->dev == dev || listen->dev == NULL)) { | |
1da177e4 LT |
189 | spin_unlock_bh(&listen_lock); |
190 | return 1; | |
191 | } | |
192 | spin_unlock_bh(&listen_lock); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | void ax25_link_failed(ax25_cb *ax25, int reason) | |
198 | { | |
a4282717 RB |
199 | struct ax25_linkfail *lf; |
200 | struct hlist_node *node; | |
1da177e4 LT |
201 | |
202 | spin_lock_bh(&linkfail_lock); | |
a4282717 RB |
203 | hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node) |
204 | lf->func(ax25, reason); | |
1da177e4 LT |
205 | spin_unlock_bh(&linkfail_lock); |
206 | } | |
207 | ||
208 | int ax25_protocol_is_registered(unsigned int pid) | |
209 | { | |
8d5cf596 | 210 | struct ax25_protocol *protocol; |
1da177e4 LT |
211 | int res = 0; |
212 | ||
95ff9f4d | 213 | read_lock_bh(&protocol_list_lock); |
1da177e4 LT |
214 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
215 | if (protocol->pid == pid) { | |
216 | res = 1; | |
217 | break; | |
218 | } | |
95ff9f4d | 219 | read_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
220 | |
221 | return res; | |
222 | } |