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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 <linux/fcntl.h> |
28 | #include <linux/mm.h> |
29 | #include <linux/interrupt.h> |
30 | |
31 | static struct ax25_protocol *protocol_list; |
32 | static DEFINE_RWLOCK(protocol_list_lock); |
33 | |
34 | static HLIST_HEAD(ax25_linkfail_list); |
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 | |
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) |
49 | { |
50 | write_lock_bh(&protocol_list_lock); |
51 | ap->next = protocol_list; |
52 | protocol_list = ap; |
53 | write_unlock_bh(&protocol_list_lock); |
54 | } |
55 | |
56 | EXPORT_SYMBOL_GPL(ax25_register_pid); |
57 | |
58 | void ax25_protocol_release(unsigned int pid) |
59 | { |
60 | struct ax25_protocol *protocol; |
61 | |
62 | write_lock_bh(&protocol_list_lock); |
63 | protocol = protocol_list; |
64 | if (protocol == NULL) |
65 | goto out; |
66 | |
67 | if (protocol->pid == pid) { |
68 | protocol_list = protocol->next; |
69 | goto out; |
70 | } |
71 | |
72 | while (protocol != NULL && protocol->next != NULL) { |
73 | if (protocol->next->pid == pid) { |
74 | protocol->next = protocol->next->next; |
75 | goto out; |
76 | } |
77 | |
78 | protocol = protocol->next; |
79 | } |
80 | out: |
81 | write_unlock_bh(&protocol_list_lock); |
82 | } |
83 | |
84 | EXPORT_SYMBOL(ax25_protocol_release); |
85 | |
86 | void ax25_linkfail_register(struct ax25_linkfail *lf) |
87 | { |
88 | spin_lock_bh(&linkfail_lock); |
89 | hlist_add_head(&lf->lf_node, &ax25_linkfail_list); |
90 | spin_unlock_bh(&linkfail_lock); |
91 | } |
92 | |
93 | EXPORT_SYMBOL(ax25_linkfail_register); |
94 | |
95 | void ax25_linkfail_release(struct ax25_linkfail *lf) |
96 | { |
97 | spin_lock_bh(&linkfail_lock); |
98 | hlist_del_init(&lf->lf_node); |
99 | spin_unlock_bh(&linkfail_lock); |
100 | } |
101 | |
102 | EXPORT_SYMBOL(ax25_linkfail_release); |
103 | |
104 | int ax25_listen_register(ax25_address *callsign, struct net_device *dev) |
105 | { |
106 | struct listen_struct *listen; |
107 | |
108 | if (ax25_listen_mine(callsign, dev)) |
109 | return 0; |
110 | |
111 | if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL) |
112 | return -ENOMEM; |
113 | |
114 | listen->callsign = *callsign; |
115 | listen->dev = dev; |
116 | |
117 | spin_lock_bh(&listen_lock); |
118 | listen->next = listen_list; |
119 | listen_list = listen; |
120 | spin_unlock_bh(&listen_lock); |
121 | |
122 | return 0; |
123 | } |
124 | |
125 | EXPORT_SYMBOL(ax25_listen_register); |
126 | |
127 | void ax25_listen_release(ax25_address *callsign, struct net_device *dev) |
128 | { |
129 | struct listen_struct *s, *listen; |
130 | |
131 | spin_lock_bh(&listen_lock); |
132 | listen = listen_list; |
133 | if (listen == NULL) { |
134 | spin_unlock_bh(&listen_lock); |
135 | return; |
136 | } |
137 | |
138 | if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) { |
139 | listen_list = listen->next; |
140 | spin_unlock_bh(&listen_lock); |
141 | kfree(listen); |
142 | return; |
143 | } |
144 | |
145 | while (listen != NULL && listen->next != NULL) { |
146 | if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) { |
147 | s = listen->next; |
148 | listen->next = listen->next->next; |
149 | spin_unlock_bh(&listen_lock); |
150 | kfree(s); |
151 | return; |
152 | } |
153 | |
154 | listen = listen->next; |
155 | } |
156 | spin_unlock_bh(&listen_lock); |
157 | } |
158 | |
159 | EXPORT_SYMBOL(ax25_listen_release); |
160 | |
161 | int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) |
162 | { |
163 | int (*res)(struct sk_buff *, ax25_cb *) = NULL; |
164 | struct ax25_protocol *protocol; |
165 | |
166 | read_lock(&protocol_list_lock); |
167 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
168 | if (protocol->pid == pid) { |
169 | res = protocol->func; |
170 | break; |
171 | } |
172 | read_unlock(&protocol_list_lock); |
173 | |
174 | return res; |
175 | } |
176 | |
177 | int ax25_listen_mine(ax25_address *callsign, struct net_device *dev) |
178 | { |
179 | struct listen_struct *listen; |
180 | |
181 | spin_lock_bh(&listen_lock); |
182 | for (listen = listen_list; listen != NULL; listen = listen->next) |
183 | if (ax25cmp(&listen->callsign, callsign) == 0 && |
184 | (listen->dev == dev || listen->dev == NULL)) { |
185 | spin_unlock_bh(&listen_lock); |
186 | return 1; |
187 | } |
188 | spin_unlock_bh(&listen_lock); |
189 | |
190 | return 0; |
191 | } |
192 | |
193 | void ax25_link_failed(ax25_cb *ax25, int reason) |
194 | { |
195 | struct ax25_linkfail *lf; |
196 | |
197 | spin_lock_bh(&linkfail_lock); |
198 | hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node) |
199 | lf->func(ax25, reason); |
200 | spin_unlock_bh(&linkfail_lock); |
201 | } |
202 | |
203 | int ax25_protocol_is_registered(unsigned int pid) |
204 | { |
205 | struct ax25_protocol *protocol; |
206 | int res = 0; |
207 | |
208 | read_lock_bh(&protocol_list_lock); |
209 | for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) |
210 | if (protocol->pid == pid) { |
211 | res = 1; |
212 | break; |
213 | } |
214 | read_unlock_bh(&protocol_list_lock); |
215 | |
216 | return res; |
217 | } |
218 |
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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