Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
20 | #include <linux/if_arp.h> |
21 | #include <linux/init.h> | |
22 | #include <net/x25.h> | |
23 | ||
24 | struct list_head x25_route_list = LIST_HEAD_INIT(x25_route_list); | |
25 | DEFINE_RWLOCK(x25_route_list_lock); | |
26 | ||
27 | /* | |
28 | * Add a new route. | |
29 | */ | |
30 | static int x25_add_route(struct x25_address *address, unsigned int sigdigits, | |
31 | struct net_device *dev) | |
32 | { | |
33 | struct x25_route *rt; | |
34 | struct list_head *entry; | |
35 | int rc = -EINVAL; | |
36 | ||
37 | write_lock_bh(&x25_route_list_lock); | |
38 | ||
39 | list_for_each(entry, &x25_route_list) { | |
40 | rt = list_entry(entry, struct x25_route, node); | |
41 | ||
42 | if (!memcmp(&rt->address, address, sigdigits) && | |
43 | rt->sigdigits == sigdigits) | |
44 | goto out; | |
45 | } | |
46 | ||
47 | rt = kmalloc(sizeof(*rt), GFP_ATOMIC); | |
48 | rc = -ENOMEM; | |
49 | if (!rt) | |
50 | goto out; | |
51 | ||
52 | strcpy(rt->address.x25_addr, "000000000000000"); | |
53 | memcpy(rt->address.x25_addr, address->x25_addr, sigdigits); | |
54 | ||
55 | rt->sigdigits = sigdigits; | |
56 | rt->dev = dev; | |
57 | atomic_set(&rt->refcnt, 1); | |
58 | ||
59 | list_add(&rt->node, &x25_route_list); | |
60 | rc = 0; | |
61 | out: | |
62 | write_unlock_bh(&x25_route_list_lock); | |
63 | return rc; | |
64 | } | |
65 | ||
66 | /** | |
67 | * __x25_remove_route - remove route from x25_route_list | |
68 | * @rt - route to remove | |
69 | * | |
70 | * Remove route from x25_route_list. If it was there. | |
71 | * Caller must hold x25_route_list_lock. | |
72 | */ | |
73 | static void __x25_remove_route(struct x25_route *rt) | |
74 | { | |
75 | if (rt->node.next) { | |
76 | list_del(&rt->node); | |
77 | x25_route_put(rt); | |
78 | } | |
79 | } | |
80 | ||
81 | static int x25_del_route(struct x25_address *address, unsigned int sigdigits, | |
82 | struct net_device *dev) | |
83 | { | |
84 | struct x25_route *rt; | |
85 | struct list_head *entry; | |
86 | int rc = -EINVAL; | |
87 | ||
88 | write_lock_bh(&x25_route_list_lock); | |
89 | ||
90 | list_for_each(entry, &x25_route_list) { | |
91 | rt = list_entry(entry, struct x25_route, node); | |
92 | ||
93 | if (!memcmp(&rt->address, address, sigdigits) && | |
94 | rt->sigdigits == sigdigits && rt->dev == dev) { | |
95 | __x25_remove_route(rt); | |
96 | rc = 0; | |
97 | break; | |
98 | } | |
99 | } | |
100 | ||
101 | write_unlock_bh(&x25_route_list_lock); | |
102 | return rc; | |
103 | } | |
104 | ||
105 | /* | |
106 | * A device has been removed, remove its routes. | |
107 | */ | |
108 | void x25_route_device_down(struct net_device *dev) | |
109 | { | |
110 | struct x25_route *rt; | |
111 | struct list_head *entry, *tmp; | |
112 | ||
113 | write_lock_bh(&x25_route_list_lock); | |
114 | ||
115 | list_for_each_safe(entry, tmp, &x25_route_list) { | |
116 | rt = list_entry(entry, struct x25_route, node); | |
117 | ||
118 | if (rt->dev == dev) | |
119 | __x25_remove_route(rt); | |
120 | } | |
121 | write_unlock_bh(&x25_route_list_lock); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Check that the device given is a valid X.25 interface that is "up". | |
126 | */ | |
127 | struct net_device *x25_dev_get(char *devname) | |
128 | { | |
129 | struct net_device *dev = dev_get_by_name(devname); | |
130 | ||
131 | if (dev && | |
132 | (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25 | |
133 | #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) | |
134 | && dev->type != ARPHRD_ETHER | |
135 | #endif | |
136 | ))) | |
137 | dev_put(dev); | |
138 | ||
139 | return dev; | |
140 | } | |
141 | ||
142 | /** | |
143 | * x25_get_route - Find a route given an X.25 address. | |
144 | * @addr - address to find a route for | |
145 | * | |
146 | * Find a route given an X.25 address. | |
147 | */ | |
148 | struct x25_route *x25_get_route(struct x25_address *addr) | |
149 | { | |
150 | struct x25_route *rt, *use = NULL; | |
151 | struct list_head *entry; | |
152 | ||
153 | read_lock_bh(&x25_route_list_lock); | |
154 | ||
155 | list_for_each(entry, &x25_route_list) { | |
156 | rt = list_entry(entry, struct x25_route, node); | |
157 | ||
158 | if (!memcmp(&rt->address, addr, rt->sigdigits)) { | |
159 | if (!use) | |
160 | use = rt; | |
161 | else if (rt->sigdigits > use->sigdigits) | |
162 | use = rt; | |
163 | } | |
164 | } | |
165 | ||
166 | if (use) | |
167 | x25_route_hold(use); | |
168 | ||
169 | read_unlock_bh(&x25_route_list_lock); | |
170 | return use; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Handle the ioctls that control the routing functions. | |
175 | */ | |
176 | int x25_route_ioctl(unsigned int cmd, void __user *arg) | |
177 | { | |
178 | struct x25_route_struct rt; | |
179 | struct net_device *dev; | |
180 | int rc = -EINVAL; | |
181 | ||
182 | if (cmd != SIOCADDRT && cmd != SIOCDELRT) | |
183 | goto out; | |
184 | ||
185 | rc = -EFAULT; | |
186 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
187 | goto out; | |
188 | ||
189 | rc = -EINVAL; | |
190 | if (rt.sigdigits < 0 || rt.sigdigits > 15) | |
191 | goto out; | |
192 | ||
193 | dev = x25_dev_get(rt.device); | |
194 | if (!dev) | |
195 | goto out; | |
196 | ||
197 | if (cmd == SIOCADDRT) | |
198 | rc = x25_add_route(&rt.address, rt.sigdigits, dev); | |
199 | else | |
200 | rc = x25_del_route(&rt.address, rt.sigdigits, dev); | |
201 | dev_put(dev); | |
202 | out: | |
203 | return rc; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Release all memory associated with X.25 routing structures. | |
208 | */ | |
209 | void __exit x25_route_free(void) | |
210 | { | |
211 | struct x25_route *rt; | |
212 | struct list_head *entry, *tmp; | |
213 | ||
214 | write_lock_bh(&x25_route_list_lock); | |
215 | list_for_each_safe(entry, tmp, &x25_route_list) { | |
216 | rt = list_entry(entry, struct x25_route, node); | |
217 | __x25_remove_route(rt); | |
218 | } | |
219 | write_unlock_bh(&x25_route_list_lock); | |
220 | } |