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1/*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 */
19
20#include <linux/if_arp.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/x25.h>
24
25LIST_HEAD(x25_route_list);
26DEFINE_RWLOCK(x25_route_list_lock);
27
28/*
29 * Add a new route.
30 */
31static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
32 struct net_device *dev)
33{
34 struct x25_route *rt;
35 struct list_head *entry;
36 int rc = -EINVAL;
37
38 write_lock_bh(&x25_route_list_lock);
39
40 list_for_each(entry, &x25_route_list) {
41 rt = list_entry(entry, struct x25_route, node);
42
43 if (!memcmp(&rt->address, address, sigdigits) &&
44 rt->sigdigits == sigdigits)
45 goto out;
46 }
47
48 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
49 rc = -ENOMEM;
50 if (!rt)
51 goto out;
52
53 strcpy(rt->address.x25_addr, "000000000000000");
54 memcpy(rt->address.x25_addr, address->x25_addr, sigdigits);
55
56 rt->sigdigits = sigdigits;
57 rt->dev = dev;
58 atomic_set(&rt->refcnt, 1);
59
60 list_add(&rt->node, &x25_route_list);
61 rc = 0;
62out:
63 write_unlock_bh(&x25_route_list_lock);
64 return rc;
65}
66
67/**
68 * __x25_remove_route - remove route from x25_route_list
69 * @rt: route to remove
70 *
71 * Remove route from x25_route_list. If it was there.
72 * Caller must hold x25_route_list_lock.
73 */
74static void __x25_remove_route(struct x25_route *rt)
75{
76 if (rt->node.next) {
77 list_del(&rt->node);
78 x25_route_put(rt);
79 }
80}
81
82static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
83 struct net_device *dev)
84{
85 struct x25_route *rt;
86 struct list_head *entry;
87 int rc = -EINVAL;
88
89 write_lock_bh(&x25_route_list_lock);
90
91 list_for_each(entry, &x25_route_list) {
92 rt = list_entry(entry, struct x25_route, node);
93
94 if (!memcmp(&rt->address, address, sigdigits) &&
95 rt->sigdigits == sigdigits && rt->dev == dev) {
96 __x25_remove_route(rt);
97 rc = 0;
98 break;
99 }
100 }
101
102 write_unlock_bh(&x25_route_list_lock);
103 return rc;
104}
105
106/*
107 * A device has been removed, remove its routes.
108 */
109void x25_route_device_down(struct net_device *dev)
110{
111 struct x25_route *rt;
112 struct list_head *entry, *tmp;
113
114 write_lock_bh(&x25_route_list_lock);
115
116 list_for_each_safe(entry, tmp, &x25_route_list) {
117 rt = list_entry(entry, struct x25_route, node);
118
119 if (rt->dev == dev)
120 __x25_remove_route(rt);
121 }
122 write_unlock_bh(&x25_route_list_lock);
123
124 /* Remove any related forwarding */
125 x25_clear_forward_by_dev(dev);
126}
127
128/*
129 * Check that the device given is a valid X.25 interface that is "up".
130 */
131struct net_device *x25_dev_get(char *devname)
132{
133 struct net_device *dev = dev_get_by_name(&init_net, devname);
134
135 if (dev &&
136 (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
137#if IS_ENABLED(CONFIG_LLC)
138 && dev->type != ARPHRD_ETHER
139#endif
140 ))){
141 dev_put(dev);
142 dev = NULL;
143 }
144
145 return dev;
146}
147
148/**
149 * x25_get_route - Find a route given an X.25 address.
150 * @addr - address to find a route for
151 *
152 * Find a route given an X.25 address.
153 */
154struct x25_route *x25_get_route(struct x25_address *addr)
155{
156 struct x25_route *rt, *use = NULL;
157 struct list_head *entry;
158
159 read_lock_bh(&x25_route_list_lock);
160
161 list_for_each(entry, &x25_route_list) {
162 rt = list_entry(entry, struct x25_route, node);
163
164 if (!memcmp(&rt->address, addr, rt->sigdigits)) {
165 if (!use)
166 use = rt;
167 else if (rt->sigdigits > use->sigdigits)
168 use = rt;
169 }
170 }
171
172 if (use)
173 x25_route_hold(use);
174
175 read_unlock_bh(&x25_route_list_lock);
176 return use;
177}
178
179/*
180 * Handle the ioctls that control the routing functions.
181 */
182int x25_route_ioctl(unsigned int cmd, void __user *arg)
183{
184 struct x25_route_struct rt;
185 struct net_device *dev;
186 int rc = -EINVAL;
187
188 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
189 goto out;
190
191 rc = -EFAULT;
192 if (copy_from_user(&rt, arg, sizeof(rt)))
193 goto out;
194
195 rc = -EINVAL;
196 if (rt.sigdigits > 15)
197 goto out;
198
199 dev = x25_dev_get(rt.device);
200 if (!dev)
201 goto out;
202
203 if (cmd == SIOCADDRT)
204 rc = x25_add_route(&rt.address, rt.sigdigits, dev);
205 else
206 rc = x25_del_route(&rt.address, rt.sigdigits, dev);
207 dev_put(dev);
208out:
209 return rc;
210}
211
212/*
213 * Release all memory associated with X.25 routing structures.
214 */
215void __exit x25_route_free(void)
216{
217 struct x25_route *rt;
218 struct list_head *entry, *tmp;
219
220 write_lock_bh(&x25_route_list_lock);
221 list_for_each_safe(entry, tmp, &x25_route_list) {
222 rt = list_entry(entry, struct x25_route, node);
223 __x25_remove_route(rt);
224 }
225 write_unlock_bh(&x25_route_list_lock);
226}
1/*
2 * X.25 Packet Layer release 002
3 *
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
7 *
8 * This code REQUIRES 2.1.15 or higher
9 *
10 * This module:
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * History
17 * X.25 001 Jonathan Naylor Started coding.
18 */
19
20#include <linux/if_arp.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/x25.h>
24
25LIST_HEAD(x25_route_list);
26DEFINE_RWLOCK(x25_route_list_lock);
27
28/*
29 * Add a new route.
30 */
31static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
32 struct net_device *dev)
33{
34 struct x25_route *rt;
35 struct list_head *entry;
36 int rc = -EINVAL;
37
38 write_lock_bh(&x25_route_list_lock);
39
40 list_for_each(entry, &x25_route_list) {
41 rt = list_entry(entry, struct x25_route, node);
42
43 if (!memcmp(&rt->address, address, sigdigits) &&
44 rt->sigdigits == sigdigits)
45 goto out;
46 }
47
48 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
49 rc = -ENOMEM;
50 if (!rt)
51 goto out;
52
53 strcpy(rt->address.x25_addr, "000000000000000");
54 memcpy(rt->address.x25_addr, address->x25_addr, sigdigits);
55
56 rt->sigdigits = sigdigits;
57 rt->dev = dev;
58 atomic_set(&rt->refcnt, 1);
59
60 list_add(&rt->node, &x25_route_list);
61 rc = 0;
62out:
63 write_unlock_bh(&x25_route_list_lock);
64 return rc;
65}
66
67/**
68 * __x25_remove_route - remove route from x25_route_list
69 * @rt - route to remove
70 *
71 * Remove route from x25_route_list. If it was there.
72 * Caller must hold x25_route_list_lock.
73 */
74static void __x25_remove_route(struct x25_route *rt)
75{
76 if (rt->node.next) {
77 list_del(&rt->node);
78 x25_route_put(rt);
79 }
80}
81
82static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
83 struct net_device *dev)
84{
85 struct x25_route *rt;
86 struct list_head *entry;
87 int rc = -EINVAL;
88
89 write_lock_bh(&x25_route_list_lock);
90
91 list_for_each(entry, &x25_route_list) {
92 rt = list_entry(entry, struct x25_route, node);
93
94 if (!memcmp(&rt->address, address, sigdigits) &&
95 rt->sigdigits == sigdigits && rt->dev == dev) {
96 __x25_remove_route(rt);
97 rc = 0;
98 break;
99 }
100 }
101
102 write_unlock_bh(&x25_route_list_lock);
103 return rc;
104}
105
106/*
107 * A device has been removed, remove its routes.
108 */
109void x25_route_device_down(struct net_device *dev)
110{
111 struct x25_route *rt;
112 struct list_head *entry, *tmp;
113
114 write_lock_bh(&x25_route_list_lock);
115
116 list_for_each_safe(entry, tmp, &x25_route_list) {
117 rt = list_entry(entry, struct x25_route, node);
118
119 if (rt->dev == dev)
120 __x25_remove_route(rt);
121 }
122 write_unlock_bh(&x25_route_list_lock);
123
124 /* Remove any related forwarding */
125 x25_clear_forward_by_dev(dev);
126}
127
128/*
129 * Check that the device given is a valid X.25 interface that is "up".
130 */
131struct net_device *x25_dev_get(char *devname)
132{
133 struct net_device *dev = dev_get_by_name(&init_net, devname);
134
135 if (dev &&
136 (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
137#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
138 && dev->type != ARPHRD_ETHER
139#endif
140 ))){
141 dev_put(dev);
142 dev = NULL;
143 }
144
145 return dev;
146}
147
148/**
149 * x25_get_route - Find a route given an X.25 address.
150 * @addr - address to find a route for
151 *
152 * Find a route given an X.25 address.
153 */
154struct x25_route *x25_get_route(struct x25_address *addr)
155{
156 struct x25_route *rt, *use = NULL;
157 struct list_head *entry;
158
159 read_lock_bh(&x25_route_list_lock);
160
161 list_for_each(entry, &x25_route_list) {
162 rt = list_entry(entry, struct x25_route, node);
163
164 if (!memcmp(&rt->address, addr, rt->sigdigits)) {
165 if (!use)
166 use = rt;
167 else if (rt->sigdigits > use->sigdigits)
168 use = rt;
169 }
170 }
171
172 if (use)
173 x25_route_hold(use);
174
175 read_unlock_bh(&x25_route_list_lock);
176 return use;
177}
178
179/*
180 * Handle the ioctls that control the routing functions.
181 */
182int x25_route_ioctl(unsigned int cmd, void __user *arg)
183{
184 struct x25_route_struct rt;
185 struct net_device *dev;
186 int rc = -EINVAL;
187
188 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
189 goto out;
190
191 rc = -EFAULT;
192 if (copy_from_user(&rt, arg, sizeof(rt)))
193 goto out;
194
195 rc = -EINVAL;
196 if (rt.sigdigits > 15)
197 goto out;
198
199 dev = x25_dev_get(rt.device);
200 if (!dev)
201 goto out;
202
203 if (cmd == SIOCADDRT)
204 rc = x25_add_route(&rt.address, rt.sigdigits, dev);
205 else
206 rc = x25_del_route(&rt.address, rt.sigdigits, dev);
207 dev_put(dev);
208out:
209 return rc;
210}
211
212/*
213 * Release all memory associated with X.25 routing structures.
214 */
215void __exit x25_route_free(void)
216{
217 struct x25_route *rt;
218 struct list_head *entry, *tmp;
219
220 write_lock_bh(&x25_route_list_lock);
221 list_for_each_safe(entry, tmp, &x25_route_list) {
222 rt = list_entry(entry, struct x25_route, node);
223 __x25_remove_route(rt);
224 }
225 write_unlock_bh(&x25_route_list_lock);
226}