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 | |
29 | ax25_dev *ax25_dev_list; |
30 | DEFINE_SPINLOCK(ax25_dev_lock); |
31 | |
32 | ax25_dev *ax25_addr_ax25dev(ax25_address *addr) |
33 | { |
34 | ax25_dev *ax25_dev, *res = NULL; |
35 | |
36 | spin_lock_bh(lock: &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(lock: &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 | */ |
51 | void ax25_dev_device_up(struct net_device *dev) |
52 | { |
53 | ax25_dev *ax25_dev; |
54 | |
55 | ax25_dev = kzalloc(size: 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(r: &ax25_dev->refcount, n: 1); |
62 | dev->ax25_ptr = ax25_dev; |
63 | ax25_dev->dev = dev; |
64 | netdev_hold(dev, tracker: &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(lock: &ax25_dev_lock); |
88 | ax25_dev->next = ax25_dev_list; |
89 | ax25_dev_list = ax25_dev; |
90 | spin_unlock_bh(lock: &ax25_dev_lock); |
91 | ax25_dev_hold(ax25_dev); |
92 | |
93 | ax25_register_dev_sysctl(ax25_dev); |
94 | } |
95 | |
96 | void 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(lock: &ax25_dev_lock); |
106 | |
107 | #ifdef CONFIG_AX25_DAMA_SLAVE |
108 | timer_shutdown_sync(timer: &ax25_dev->dama.slave_timer); |
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(lock: &ax25_dev_lock); |
132 | dev->ax25_ptr = NULL; |
133 | ax25_dev_put(ax25_dev); |
134 | return; |
135 | |
136 | unlock_put: |
137 | spin_unlock_bh(lock: &ax25_dev_lock); |
138 | ax25_dev_put(ax25_dev); |
139 | dev->ax25_ptr = NULL; |
140 | netdev_put(dev, tracker: &ax25_dev->dev_tracker); |
141 | ax25_dev_put(ax25_dev); |
142 | } |
143 | |
144 | int 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(addr: &fwd->port_from)) == NULL) |
149 | return -EINVAL; |
150 | |
151 | switch (cmd) { |
152 | case SIOCAX25ADDFWD: |
153 | fwd_dev = ax25_addr_ax25dev(addr: &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(ax25_dev: fwd_dev); |
160 | ax25_dev_put(ax25_dev); |
161 | return -EINVAL; |
162 | } |
163 | ax25_dev->forward = fwd_dev->dev; |
164 | ax25_dev_put(ax25_dev: 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 | |
185 | struct 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 | */ |
201 | void __exit ax25_dev_free(void) |
202 | { |
203 | ax25_dev *s, *ax25_dev; |
204 | |
205 | spin_lock_bh(lock: &ax25_dev_lock); |
206 | ax25_dev = ax25_dev_list; |
207 | while (ax25_dev != NULL) { |
208 | s = ax25_dev; |
209 | netdev_put(dev: ax25_dev->dev, tracker: &ax25_dev->dev_tracker); |
210 | ax25_dev = ax25_dev->next; |
211 | kfree(objp: s); |
212 | } |
213 | ax25_dev_list = NULL; |
214 | spin_unlock_bh(lock: &ax25_dev_lock); |
215 | } |
216 | |