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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 */
6#include <linux/errno.h>
7#include <linux/types.h>
8#include <linux/socket.h>
9#include <linux/slab.h>
10#include <linux/in.h>
11#include <linux/kernel.h>
12#include <linux/timer.h>
13#include <linux/string.h>
14#include <linux/sockios.h>
15#include <linux/net.h>
16#include <linux/spinlock.h>
17#include <net/ax25.h>
18#include <linux/inet.h>
19#include <linux/netdevice.h>
20#include <linux/if_arp.h>
21#include <linux/skbuff.h>
22#include <net/sock.h>
23#include <linux/uaccess.h>
24#include <linux/fcntl.h>
25#include <linux/mm.h>
26#include <linux/interrupt.h>
27#include <linux/init.h>
28
29ax25_dev *ax25_dev_list;
30DEFINE_SPINLOCK(ax25_dev_lock);
31
32ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
33{
34 ax25_dev *ax25_dev, *res = NULL;
35
36 spin_lock_bh(&ax25_dev_lock);
37 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
38 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
39 res = ax25_dev;
40 }
41 spin_unlock_bh(&ax25_dev_lock);
42
43 return res;
44}
45
46/*
47 * This is called when an interface is brought up. These are
48 * reasonable defaults.
49 */
50void ax25_dev_device_up(struct net_device *dev)
51{
52 ax25_dev *ax25_dev;
53
54 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
55 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
56 return;
57 }
58
59 dev->ax25_ptr = ax25_dev;
60 ax25_dev->dev = dev;
61 dev_hold(dev);
62 ax25_dev->forward = NULL;
63
64 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
65 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
66 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
67 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
68 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
69 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
70 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
71 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
72 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
73 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
74 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
75 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
76 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
77 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
78
79#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
80 ax25_ds_setup_timer(ax25_dev);
81#endif
82
83 spin_lock_bh(&ax25_dev_lock);
84 ax25_dev->next = ax25_dev_list;
85 ax25_dev_list = ax25_dev;
86 spin_unlock_bh(&ax25_dev_lock);
87
88 ax25_register_dev_sysctl(ax25_dev);
89}
90
91void ax25_dev_device_down(struct net_device *dev)
92{
93 ax25_dev *s, *ax25_dev;
94
95 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
96 return;
97
98 ax25_unregister_dev_sysctl(ax25_dev);
99
100 spin_lock_bh(&ax25_dev_lock);
101
102#ifdef CONFIG_AX25_DAMA_SLAVE
103 ax25_ds_del_timer(ax25_dev);
104#endif
105
106 /*
107 * Remove any packet forwarding that points to this device.
108 */
109 for (s = ax25_dev_list; s != NULL; s = s->next)
110 if (s->forward == dev)
111 s->forward = NULL;
112
113 if ((s = ax25_dev_list) == ax25_dev) {
114 ax25_dev_list = s->next;
115 spin_unlock_bh(&ax25_dev_lock);
116 dev->ax25_ptr = NULL;
117 dev_put(dev);
118 kfree(ax25_dev);
119 return;
120 }
121
122 while (s != NULL && s->next != NULL) {
123 if (s->next == ax25_dev) {
124 s->next = ax25_dev->next;
125 spin_unlock_bh(&ax25_dev_lock);
126 dev->ax25_ptr = NULL;
127 dev_put(dev);
128 kfree(ax25_dev);
129 return;
130 }
131
132 s = s->next;
133 }
134 spin_unlock_bh(&ax25_dev_lock);
135 dev->ax25_ptr = NULL;
136}
137
138int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
139{
140 ax25_dev *ax25_dev, *fwd_dev;
141
142 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
143 return -EINVAL;
144
145 switch (cmd) {
146 case SIOCAX25ADDFWD:
147 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
148 return -EINVAL;
149 if (ax25_dev->forward != NULL)
150 return -EINVAL;
151 ax25_dev->forward = fwd_dev->dev;
152 break;
153
154 case SIOCAX25DELFWD:
155 if (ax25_dev->forward == NULL)
156 return -EINVAL;
157 ax25_dev->forward = NULL;
158 break;
159
160 default:
161 return -EINVAL;
162 }
163
164 return 0;
165}
166
167struct net_device *ax25_fwd_dev(struct net_device *dev)
168{
169 ax25_dev *ax25_dev;
170
171 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
172 return dev;
173
174 if (ax25_dev->forward == NULL)
175 return dev;
176
177 return ax25_dev->forward;
178}
179
180/*
181 * Free all memory associated with device structures.
182 */
183void __exit ax25_dev_free(void)
184{
185 ax25_dev *s, *ax25_dev;
186
187 spin_lock_bh(&ax25_dev_lock);
188 ax25_dev = ax25_dev_list;
189 while (ax25_dev != NULL) {
190 s = ax25_dev;
191 dev_put(ax25_dev->dev);
192 ax25_dev = ax25_dev->next;
193 kfree(s);
194 }
195 ax25_dev_list = NULL;
196 spin_unlock_bh(&ax25_dev_lock);
197}
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/slab.h>
13#include <linux/in.h>
14#include <linux/kernel.h>
15#include <linux/timer.h>
16#include <linux/string.h>
17#include <linux/sockios.h>
18#include <linux/net.h>
19#include <linux/spinlock.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <linux/if_arp.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#include <linux/init.h>
31
32ax25_dev *ax25_dev_list;
33DEFINE_SPINLOCK(ax25_dev_lock);
34
35ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
36{
37 ax25_dev *ax25_dev, *res = NULL;
38
39 spin_lock_bh(&ax25_dev_lock);
40 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
41 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
42 res = ax25_dev;
43 }
44 spin_unlock_bh(&ax25_dev_lock);
45
46 return res;
47}
48
49/*
50 * This is called when an interface is brought up. These are
51 * reasonable defaults.
52 */
53void ax25_dev_device_up(struct net_device *dev)
54{
55 ax25_dev *ax25_dev;
56
57 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
58 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
59 return;
60 }
61
62 dev->ax25_ptr = ax25_dev;
63 ax25_dev->dev = dev;
64 dev_hold(dev);
65 ax25_dev->forward = NULL;
66
67 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
68 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
69 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
70 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
71 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
72 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
73 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
74 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
75 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
76 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
77 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
78 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
79 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
80 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
81
82#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
83 ax25_ds_setup_timer(ax25_dev);
84#endif
85
86 spin_lock_bh(&ax25_dev_lock);
87 ax25_dev->next = ax25_dev_list;
88 ax25_dev_list = ax25_dev;
89 spin_unlock_bh(&ax25_dev_lock);
90
91 ax25_register_dev_sysctl(ax25_dev);
92}
93
94void ax25_dev_device_down(struct net_device *dev)
95{
96 ax25_dev *s, *ax25_dev;
97
98 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
99 return;
100
101 ax25_unregister_dev_sysctl(ax25_dev);
102
103 spin_lock_bh(&ax25_dev_lock);
104
105#ifdef CONFIG_AX25_DAMA_SLAVE
106 ax25_ds_del_timer(ax25_dev);
107#endif
108
109 /*
110 * Remove any packet forwarding that points to this device.
111 */
112 for (s = ax25_dev_list; s != NULL; s = s->next)
113 if (s->forward == dev)
114 s->forward = NULL;
115
116 if ((s = ax25_dev_list) == ax25_dev) {
117 ax25_dev_list = s->next;
118 spin_unlock_bh(&ax25_dev_lock);
119 dev_put(dev);
120 kfree(ax25_dev);
121 return;
122 }
123
124 while (s != NULL && s->next != NULL) {
125 if (s->next == ax25_dev) {
126 s->next = ax25_dev->next;
127 spin_unlock_bh(&ax25_dev_lock);
128 dev_put(dev);
129 kfree(ax25_dev);
130 return;
131 }
132
133 s = s->next;
134 }
135 spin_unlock_bh(&ax25_dev_lock);
136 dev->ax25_ptr = NULL;
137}
138
139int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
140{
141 ax25_dev *ax25_dev, *fwd_dev;
142
143 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
144 return -EINVAL;
145
146 switch (cmd) {
147 case SIOCAX25ADDFWD:
148 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
149 return -EINVAL;
150 if (ax25_dev->forward != NULL)
151 return -EINVAL;
152 ax25_dev->forward = fwd_dev->dev;
153 break;
154
155 case SIOCAX25DELFWD:
156 if (ax25_dev->forward == NULL)
157 return -EINVAL;
158 ax25_dev->forward = NULL;
159 break;
160
161 default:
162 return -EINVAL;
163 }
164
165 return 0;
166}
167
168struct net_device *ax25_fwd_dev(struct net_device *dev)
169{
170 ax25_dev *ax25_dev;
171
172 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
173 return dev;
174
175 if (ax25_dev->forward == NULL)
176 return dev;
177
178 return ax25_dev->forward;
179}
180
181/*
182 * Free all memory associated with device structures.
183 */
184void __exit ax25_dev_free(void)
185{
186 ax25_dev *s, *ax25_dev;
187
188 spin_lock_bh(&ax25_dev_lock);
189 ax25_dev = ax25_dev_list;
190 while (ax25_dev != NULL) {
191 s = ax25_dev;
192 dev_put(ax25_dev->dev);
193 ax25_dev = ax25_dev->next;
194 kfree(s);
195 }
196 ax25_dev_list = NULL;
197 spin_unlock_bh(&ax25_dev_lock);
198}