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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 | |
25 | LIST_HEAD(x25_route_list); |
26 | DEFINE_RWLOCK(x25_route_list_lock); |
27 | |
28 | /* |
29 | * Add a new route. |
30 | */ |
31 | static 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; |
62 | out: |
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 | */ |
74 | static 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 | |
82 | static 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 | */ |
109 | void 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 | */ |
131 | struct 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 | */ |
154 | struct 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 | */ |
182 | int 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); |
208 | out: |
209 | return rc; |
210 | } |
211 | |
212 | /* |
213 | * Release all memory associated with X.25 routing structures. |
214 | */ |
215 | void __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 | } |
227 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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