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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 | */ |
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> |
14 | #include <linux/module.h> |
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 <linux/slab.h> |
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 | |
32 | static struct ax25_protocol *protocol_list; |
33 | static DEFINE_RWLOCK(protocol_list_lock); |
34 | |
35 | static HLIST_HEAD(ax25_linkfail_list); |
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 | |
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) |
50 | { |
51 | write_lock_bh(&protocol_list_lock); |
52 | ap->next = protocol_list; |
53 | protocol_list = ap; |
54 | write_unlock_bh(&protocol_list_lock); |
55 | } |
56 | |
57 | EXPORT_SYMBOL_GPL(ax25_register_pid); |
58 | |
59 | void ax25_protocol_release(unsigned int pid) |
60 | { |
61 | struct ax25_protocol *s, *protocol; |
62 | |
63 | write_lock_bh(&protocol_list_lock); |
64 | protocol = protocol_list; |
65 | if (protocol == NULL) |
66 | goto out; |
67 | |
68 | if (protocol->pid == pid) { |
69 | protocol_list = protocol->next; |
70 | goto out; |
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; |
77 | goto out; |
78 | } |
79 | |
80 | protocol = protocol->next; |
81 | } |
82 | out: |
83 | write_unlock_bh(&protocol_list_lock); |
84 | } |
85 | |
86 | EXPORT_SYMBOL(ax25_protocol_release); |
87 | |
88 | void ax25_linkfail_register(struct ax25_linkfail *lf) |
89 | { |
90 | spin_lock_bh(&linkfail_lock); |
91 | hlist_add_head(&lf->lf_node, &ax25_linkfail_list); |
92 | spin_unlock_bh(&linkfail_lock); |
93 | } |
94 | |
95 | EXPORT_SYMBOL(ax25_linkfail_register); |
96 | |
97 | void ax25_linkfail_release(struct ax25_linkfail *lf) |
98 | { |
99 | spin_lock_bh(&linkfail_lock); |
100 | hlist_del_init(&lf->lf_node); |
101 | spin_unlock_bh(&linkfail_lock); |
102 | } |
103 | |
104 | EXPORT_SYMBOL(ax25_linkfail_release); |
105 | |
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) |
114 | return -ENOMEM; |
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 | |
124 | return 0; |
125 | } |
126 | |
127 | EXPORT_SYMBOL(ax25_listen_register); |
128 | |
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 | |
161 | EXPORT_SYMBOL(ax25_listen_release); |
162 | |
163 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) |
164 | { |
165 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; |
166 | struct ax25_protocol *protocol; |
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) |
185 | if (ax25cmp(&listen->callsign, callsign) == 0 && |
186 | (listen->dev == dev || listen->dev == NULL)) { |
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 | { |
197 | struct ax25_linkfail *lf; |
198 | struct hlist_node *node; |
199 | |
200 | spin_lock_bh(&linkfail_lock); |
201 | hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node) |
202 | lf->func(ax25, reason); |
203 | spin_unlock_bh(&linkfail_lock); |
204 | } |
205 | |
206 | int ax25_protocol_is_registered(unsigned int pid) |
207 | { |
208 | struct ax25_protocol *protocol; |
209 | int res = 0; |
210 | |
211 | read_lock_bh(&protocol_list_lock); |
212 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
213 | if (protocol->pid == pid) { |
214 | res = 1; |
215 | break; |
216 | } |
217 | read_unlock_bh(&protocol_list_lock); |
218 | |
219 | return res; |
220 | } |
221 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9