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Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/errno.h>
7#include <linux/types.h>
8#include <linux/socket.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/in.h>
11#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#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>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080023#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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)
Jakub Kicinskic045ad22021-10-12 08:58:35 -070038 if (ax25cmp(addr, (const ax25_address *)ax25_dev->dev->dev_addr) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 res = ax25_dev;
Duoming Zhoud01ffb92022-01-28 12:47:16 +080040 ax25_dev_hold(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 }
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
Ralf Baechle1b30dd32006-07-09 12:14:22 -070055 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
57 return;
58 }
59
Duoming Zhoud01ffb92022-01-28 12:47:16 +080060 refcount_set(&ax25_dev->refcount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 dev->ax25_ptr = ax25_dev;
62 ax25_dev->dev = dev;
Eric Dumazet66ce07f2021-12-06 17:30:33 -080063 dev_hold_track(dev, &ax25_dev->dev_tracker, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 ax25_dev->forward = NULL;
65
66 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
67 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
68 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
69 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
70 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
71 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
72 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
73 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
74 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
75 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
76 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
77 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
78 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
79 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
80
81#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
Jarek Poplawskie848b582008-02-11 21:38:32 -080082 ax25_ds_setup_timer(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#endif
84
85 spin_lock_bh(&ax25_dev_lock);
86 ax25_dev->next = ax25_dev_list;
87 ax25_dev_list = ax25_dev;
88 spin_unlock_bh(&ax25_dev_lock);
Duoming Zhou87563a02022-02-03 23:08:11 +080089 ax25_dev_hold(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Eric W. Biederman0ca7a4c2012-04-19 13:34:18 +000091 ax25_register_dev_sysctl(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
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
Eric W. Biederman0ca7a4c2012-04-19 13:34:18 +0000101 ax25_unregister_dev_sysctl(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
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);
Duoming Zhou87563a02022-02-03 23:08:11 +0800119 ax25_dev_put(ax25_dev);
Cong Wangc4335702018-12-29 13:56:36 -0800120 dev->ax25_ptr = NULL;
Eric Dumazet66ce07f2021-12-06 17:30:33 -0800121 dev_put_track(dev, &ax25_dev->dev_tracker);
Duoming Zhoud01ffb92022-01-28 12:47:16 +0800122 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return;
124 }
125
126 while (s != NULL && s->next != NULL) {
127 if (s->next == ax25_dev) {
128 s->next = ax25_dev->next;
129 spin_unlock_bh(&ax25_dev_lock);
Duoming Zhou87563a02022-02-03 23:08:11 +0800130 ax25_dev_put(ax25_dev);
Cong Wangc4335702018-12-29 13:56:36 -0800131 dev->ax25_ptr = NULL;
Eric Dumazet66ce07f2021-12-06 17:30:33 -0800132 dev_put_track(dev, &ax25_dev->dev_tracker);
Duoming Zhoud01ffb92022-01-28 12:47:16 +0800133 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 return;
135 }
136
137 s = s->next;
138 }
139 spin_unlock_bh(&ax25_dev_lock);
140 dev->ax25_ptr = NULL;
Duoming Zhoud01ffb92022-01-28 12:47:16 +0800141 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
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:
Duoming Zhou87563a02022-02-03 23:08:11 +0800153 fwd_dev = ax25_addr_ax25dev(&fwd->port_to);
154 if (!fwd_dev) {
155 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return -EINVAL;
Duoming Zhou87563a02022-02-03 23:08:11 +0800157 }
158 if (ax25_dev->forward) {
159 ax25_dev_put(fwd_dev);
160 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return -EINVAL;
Duoming Zhou87563a02022-02-03 23:08:11 +0800162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 ax25_dev->forward = fwd_dev->dev;
Duoming Zhoud01ffb92022-01-28 12:47:16 +0800164 ax25_dev_put(fwd_dev);
Duoming Zhou87563a02022-02-03 23:08:11 +0800165 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 break;
167
168 case SIOCAX25DELFWD:
Duoming Zhou87563a02022-02-03 23:08:11 +0800169 if (!ax25_dev->forward) {
170 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return -EINVAL;
Duoming Zhou87563a02022-02-03 23:08:11 +0800172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 ax25_dev->forward = NULL;
Duoming Zhou87563a02022-02-03 23:08:11 +0800174 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 break;
176
177 default:
Duoming Zhou87563a02022-02-03 23:08:11 +0800178 ax25_dev_put(ax25_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 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;
Eric Dumazet66ce07f2021-12-06 17:30:33 -0800209 dev_put_track(ax25_dev->dev, &ax25_dev->dev_tracker);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 ax25_dev = ax25_dev->next;
211 kfree(s);
212 }
213 ax25_dev_list = NULL;
214 spin_unlock_bh(&ax25_dev_lock);
215}