2 * X.25 Packet Layer release 002
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.
8 * This code REQUIRES 2.1.15 or higher
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.
17 * X.25 001 Jonathan Naylor Started coding.
20 #include <linux/if_arp.h>
21 #include <linux/init.h>
24 LIST_HEAD(x25_route_list
);
25 DEFINE_RWLOCK(x25_route_list_lock
);
30 static int x25_add_route(struct x25_address
*address
, unsigned int sigdigits
,
31 struct net_device
*dev
)
34 struct list_head
*entry
;
37 write_lock_bh(&x25_route_list_lock
);
39 list_for_each(entry
, &x25_route_list
) {
40 rt
= list_entry(entry
, struct x25_route
, node
);
42 if (!memcmp(&rt
->address
, address
, sigdigits
) &&
43 rt
->sigdigits
== sigdigits
)
47 rt
= kmalloc(sizeof(*rt
), GFP_ATOMIC
);
52 strcpy(rt
->address
.x25_addr
, "000000000000000");
53 memcpy(rt
->address
.x25_addr
, address
->x25_addr
, sigdigits
);
55 rt
->sigdigits
= sigdigits
;
57 atomic_set(&rt
->refcnt
, 1);
59 list_add(&rt
->node
, &x25_route_list
);
62 write_unlock_bh(&x25_route_list_lock
);
67 * __x25_remove_route - remove route from x25_route_list
68 * @rt - route to remove
70 * Remove route from x25_route_list. If it was there.
71 * Caller must hold x25_route_list_lock.
73 static void __x25_remove_route(struct x25_route
*rt
)
81 static int x25_del_route(struct x25_address
*address
, unsigned int sigdigits
,
82 struct net_device
*dev
)
85 struct list_head
*entry
;
88 write_lock_bh(&x25_route_list_lock
);
90 list_for_each(entry
, &x25_route_list
) {
91 rt
= list_entry(entry
, struct x25_route
, node
);
93 if (!memcmp(&rt
->address
, address
, sigdigits
) &&
94 rt
->sigdigits
== sigdigits
&& rt
->dev
== dev
) {
95 __x25_remove_route(rt
);
101 write_unlock_bh(&x25_route_list_lock
);
106 * A device has been removed, remove its routes.
108 void x25_route_device_down(struct net_device
*dev
)
110 struct x25_route
*rt
;
111 struct list_head
*entry
, *tmp
;
113 write_lock_bh(&x25_route_list_lock
);
115 list_for_each_safe(entry
, tmp
, &x25_route_list
) {
116 rt
= list_entry(entry
, struct x25_route
, node
);
119 __x25_remove_route(rt
);
121 write_unlock_bh(&x25_route_list_lock
);
123 /* Remove any related forwarding */
124 x25_clear_forward_by_dev(dev
);
128 * Check that the device given is a valid X.25 interface that is "up".
130 struct net_device
*x25_dev_get(char *devname
)
132 struct net_device
*dev
= dev_get_by_name(&init_net
, devname
);
135 (!(dev
->flags
& IFF_UP
) || (dev
->type
!= ARPHRD_X25
136 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
137 && dev
->type
!= ARPHRD_ETHER
146 * x25_get_route - Find a route given an X.25 address.
147 * @addr - address to find a route for
149 * Find a route given an X.25 address.
151 struct x25_route
*x25_get_route(struct x25_address
*addr
)
153 struct x25_route
*rt
, *use
= NULL
;
154 struct list_head
*entry
;
156 read_lock_bh(&x25_route_list_lock
);
158 list_for_each(entry
, &x25_route_list
) {
159 rt
= list_entry(entry
, struct x25_route
, node
);
161 if (!memcmp(&rt
->address
, addr
, rt
->sigdigits
)) {
164 else if (rt
->sigdigits
> use
->sigdigits
)
172 read_unlock_bh(&x25_route_list_lock
);
177 * Handle the ioctls that control the routing functions.
179 int x25_route_ioctl(unsigned int cmd
, void __user
*arg
)
181 struct x25_route_struct rt
;
182 struct net_device
*dev
;
185 if (cmd
!= SIOCADDRT
&& cmd
!= SIOCDELRT
)
189 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
193 if (rt
.sigdigits
> 15)
196 dev
= x25_dev_get(rt
.device
);
200 if (cmd
== SIOCADDRT
)
201 rc
= x25_add_route(&rt
.address
, rt
.sigdigits
, dev
);
203 rc
= x25_del_route(&rt
.address
, rt
.sigdigits
, dev
);
210 * Release all memory associated with X.25 routing structures.
212 void __exit
x25_route_free(void)
214 struct x25_route
*rt
;
215 struct list_head
*entry
, *tmp
;
217 write_lock_bh(&x25_route_list_lock
);
218 list_for_each_safe(entry
, tmp
, &x25_route_list
) {
219 rt
= list_entry(entry
, struct x25_route
, node
);
220 __x25_remove_route(rt
);
222 write_unlock_bh(&x25_route_list_lock
);