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 | kfree(protocol); |
73 | return; | |
74 | } | |
75 | ||
76 | while (protocol != NULL && protocol->next != NULL) { | |
77 | if (protocol->next->pid == pid) { | |
78 | s = protocol->next; | |
79 | protocol->next = protocol->next->next; | |
95ff9f4d | 80 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
81 | kfree(s); |
82 | return; | |
83 | } | |
84 | ||
85 | protocol = protocol->next; | |
86 | } | |
95ff9f4d | 87 | write_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
88 | } |
89 | ||
70868eac RB |
90 | EXPORT_SYMBOL(ax25_protocol_release); |
91 | ||
a4282717 | 92 | void ax25_linkfail_register(struct ax25_linkfail *lf) |
1da177e4 | 93 | { |
1da177e4 | 94 | spin_lock_bh(&linkfail_lock); |
a4282717 | 95 | hlist_add_head(&lf->lf_node, &ax25_linkfail_list); |
1da177e4 | 96 | spin_unlock_bh(&linkfail_lock); |
1da177e4 LT |
97 | } |
98 | ||
70868eac RB |
99 | EXPORT_SYMBOL(ax25_linkfail_register); |
100 | ||
a4282717 | 101 | void ax25_linkfail_release(struct ax25_linkfail *lf) |
1da177e4 | 102 | { |
1da177e4 | 103 | spin_lock_bh(&linkfail_lock); |
a4282717 | 104 | hlist_del_init(&lf->lf_node); |
1da177e4 LT |
105 | spin_unlock_bh(&linkfail_lock); |
106 | } | |
107 | ||
70868eac RB |
108 | EXPORT_SYMBOL(ax25_linkfail_release); |
109 | ||
1da177e4 LT |
110 | int ax25_listen_register(ax25_address *callsign, struct net_device *dev) |
111 | { | |
112 | struct listen_struct *listen; | |
113 | ||
114 | if (ax25_listen_mine(callsign, dev)) | |
115 | return 0; | |
116 | ||
117 | if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) | |
81dcd169 | 118 | return -ENOMEM; |
1da177e4 LT |
119 | |
120 | listen->callsign = *callsign; | |
121 | listen->dev = dev; | |
122 | ||
123 | spin_lock_bh(&listen_lock); | |
124 | listen->next = listen_list; | |
125 | listen_list = listen; | |
126 | spin_unlock_bh(&listen_lock); | |
127 | ||
81dcd169 | 128 | return 0; |
1da177e4 LT |
129 | } |
130 | ||
70868eac RB |
131 | EXPORT_SYMBOL(ax25_listen_register); |
132 | ||
1da177e4 LT |
133 | void ax25_listen_release(ax25_address *callsign, struct net_device *dev) |
134 | { | |
135 | struct listen_struct *s, *listen; | |
136 | ||
137 | spin_lock_bh(&listen_lock); | |
138 | listen = listen_list; | |
139 | if (listen == NULL) { | |
140 | spin_unlock_bh(&listen_lock); | |
141 | return; | |
142 | } | |
143 | ||
144 | if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { | |
145 | listen_list = listen->next; | |
146 | spin_unlock_bh(&listen_lock); | |
147 | kfree(listen); | |
148 | return; | |
149 | } | |
150 | ||
151 | while (listen != NULL && listen->next != NULL) { | |
152 | if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { | |
153 | s = listen->next; | |
154 | listen->next = listen->next->next; | |
155 | spin_unlock_bh(&listen_lock); | |
156 | kfree(s); | |
157 | return; | |
158 | } | |
159 | ||
160 | listen = listen->next; | |
161 | } | |
162 | spin_unlock_bh(&listen_lock); | |
163 | } | |
164 | ||
70868eac RB |
165 | EXPORT_SYMBOL(ax25_listen_release); |
166 | ||
1da177e4 LT |
167 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) |
168 | { | |
169 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; | |
8d5cf596 | 170 | struct ax25_protocol *protocol; |
1da177e4 LT |
171 | |
172 | read_lock(&protocol_list_lock); | |
173 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) | |
174 | if (protocol->pid == pid) { | |
175 | res = protocol->func; | |
176 | break; | |
177 | } | |
178 | read_unlock(&protocol_list_lock); | |
179 | ||
180 | return res; | |
181 | } | |
182 | ||
183 | int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) | |
184 | { | |
185 | struct listen_struct *listen; | |
186 | ||
187 | spin_lock_bh(&listen_lock); | |
188 | for (listen = listen_list; listen != NULL; listen = listen->next) | |
81dcd169 RB |
189 | if (ax25cmp(&listen->callsign, callsign) == 0 && |
190 | (listen->dev == dev || listen->dev == NULL)) { | |
1da177e4 LT |
191 | spin_unlock_bh(&listen_lock); |
192 | return 1; | |
193 | } | |
194 | spin_unlock_bh(&listen_lock); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | void ax25_link_failed(ax25_cb *ax25, int reason) | |
200 | { | |
a4282717 RB |
201 | struct ax25_linkfail *lf; |
202 | struct hlist_node *node; | |
1da177e4 LT |
203 | |
204 | spin_lock_bh(&linkfail_lock); | |
a4282717 RB |
205 | hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node) |
206 | lf->func(ax25, reason); | |
1da177e4 LT |
207 | spin_unlock_bh(&linkfail_lock); |
208 | } | |
209 | ||
210 | int ax25_protocol_is_registered(unsigned int pid) | |
211 | { | |
8d5cf596 | 212 | struct ax25_protocol *protocol; |
1da177e4 LT |
213 | int res = 0; |
214 | ||
95ff9f4d | 215 | read_lock_bh(&protocol_list_lock); |
1da177e4 LT |
216 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
217 | if (protocol->pid == pid) { | |
218 | res = 1; | |
219 | break; | |
220 | } | |
95ff9f4d | 221 | read_unlock_bh(&protocol_list_lock); |
1da177e4 LT |
222 | |
223 | return res; | |
224 | } |