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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// 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, (const ax25_address *)ax25_dev->dev->dev_addr) == 0) {
39 res = ax25_dev;
40 ax25_dev_hold(ax25_dev);
41 }
42 spin_unlock_bh(&ax25_dev_lock);
43
44 return res;
45}
46
47/*
48 * This is called when an interface is brought up. These are
49 * reasonable defaults.
50 */
51void ax25_dev_device_up(struct net_device *dev)
52{
53 ax25_dev *ax25_dev;
54
55 ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_KERNEL);
56 if (!ax25_dev) {
57 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
58 return;
59 }
60
61 refcount_set(&ax25_dev->refcount, 1);
62 dev->ax25_ptr = ax25_dev;
63 ax25_dev->dev = dev;
64 netdev_hold(dev, &ax25_dev->dev_tracker, GFP_KERNEL);
65 ax25_dev->forward = NULL;
66 ax25_dev->device_up = true;
67
68 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
69 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
70 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
71 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
72 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
73 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
74 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
75 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
76 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
77 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
78 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
79 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
80 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
81 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
82
83#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
84 ax25_ds_setup_timer(ax25_dev);
85#endif
86
87 spin_lock_bh(&ax25_dev_lock);
88 ax25_dev->next = ax25_dev_list;
89 ax25_dev_list = ax25_dev;
90 spin_unlock_bh(&ax25_dev_lock);
91 ax25_dev_hold(ax25_dev);
92
93 ax25_register_dev_sysctl(ax25_dev);
94}
95
96void ax25_dev_device_down(struct net_device *dev)
97{
98 ax25_dev *s, *ax25_dev;
99
100 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
101 return;
102
103 ax25_unregister_dev_sysctl(ax25_dev);
104
105 spin_lock_bh(&ax25_dev_lock);
106
107#ifdef CONFIG_AX25_DAMA_SLAVE
108 ax25_ds_del_timer(ax25_dev);
109#endif
110
111 /*
112 * Remove any packet forwarding that points to this device.
113 */
114 for (s = ax25_dev_list; s != NULL; s = s->next)
115 if (s->forward == dev)
116 s->forward = NULL;
117
118 if ((s = ax25_dev_list) == ax25_dev) {
119 ax25_dev_list = s->next;
120 goto unlock_put;
121 }
122
123 while (s != NULL && s->next != NULL) {
124 if (s->next == ax25_dev) {
125 s->next = ax25_dev->next;
126 goto unlock_put;
127 }
128
129 s = s->next;
130 }
131 spin_unlock_bh(&ax25_dev_lock);
132 dev->ax25_ptr = NULL;
133 ax25_dev_put(ax25_dev);
134 return;
135
136unlock_put:
137 spin_unlock_bh(&ax25_dev_lock);
138 ax25_dev_put(ax25_dev);
139 dev->ax25_ptr = NULL;
140 netdev_put(dev, &ax25_dev->dev_tracker);
141 ax25_dev_put(ax25_dev);
142}
143
144int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
145{
146 ax25_dev *ax25_dev, *fwd_dev;
147
148 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
149 return -EINVAL;
150
151 switch (cmd) {
152 case SIOCAX25ADDFWD:
153 fwd_dev = ax25_addr_ax25dev(&fwd->port_to);
154 if (!fwd_dev) {
155 ax25_dev_put(ax25_dev);
156 return -EINVAL;
157 }
158 if (ax25_dev->forward) {
159 ax25_dev_put(fwd_dev);
160 ax25_dev_put(ax25_dev);
161 return -EINVAL;
162 }
163 ax25_dev->forward = fwd_dev->dev;
164 ax25_dev_put(fwd_dev);
165 ax25_dev_put(ax25_dev);
166 break;
167
168 case SIOCAX25DELFWD:
169 if (!ax25_dev->forward) {
170 ax25_dev_put(ax25_dev);
171 return -EINVAL;
172 }
173 ax25_dev->forward = NULL;
174 ax25_dev_put(ax25_dev);
175 break;
176
177 default:
178 ax25_dev_put(ax25_dev);
179 return -EINVAL;
180 }
181
182 return 0;
183}
184
185struct net_device *ax25_fwd_dev(struct net_device *dev)
186{
187 ax25_dev *ax25_dev;
188
189 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
190 return dev;
191
192 if (ax25_dev->forward == NULL)
193 return dev;
194
195 return ax25_dev->forward;
196}
197
198/*
199 * Free all memory associated with device structures.
200 */
201void __exit ax25_dev_free(void)
202{
203 ax25_dev *s, *ax25_dev;
204
205 spin_lock_bh(&ax25_dev_lock);
206 ax25_dev = ax25_dev_list;
207 while (ax25_dev != NULL) {
208 s = ax25_dev;
209 netdev_put(ax25_dev->dev, &ax25_dev->dev_tracker);
210 ax25_dev = ax25_dev->next;
211 kfree(s);
212 }
213 ax25_dev_list = NULL;
214 spin_unlock_bh(&ax25_dev_lock);
215}