]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/x25/x25_route.c
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>
22 #include <linux/slab.h>
25 LIST_HEAD(x25_route_list
);
26 DEFINE_RWLOCK(x25_route_list_lock
);
31 static int x25_add_route(struct x25_address
*address
, unsigned int sigdigits
,
32 struct net_device
*dev
)
35 struct list_head
*entry
;
38 write_lock_bh(&x25_route_list_lock
);
40 list_for_each(entry
, &x25_route_list
) {
41 rt
= list_entry(entry
, struct x25_route
, node
);
43 if (!memcmp(&rt
->address
, address
, sigdigits
) &&
44 rt
->sigdigits
== sigdigits
)
48 rt
= kmalloc(sizeof(*rt
), GFP_ATOMIC
);
53 strcpy(rt
->address
.x25_addr
, "000000000000000");
54 memcpy(rt
->address
.x25_addr
, address
->x25_addr
, sigdigits
);
56 rt
->sigdigits
= sigdigits
;
58 atomic_set(&rt
->refcnt
, 1);
60 list_add(&rt
->node
, &x25_route_list
);
63 write_unlock_bh(&x25_route_list_lock
);
68 * __x25_remove_route - remove route from x25_route_list
69 * @rt - route to remove
71 * Remove route from x25_route_list. If it was there.
72 * Caller must hold x25_route_list_lock.
74 static void __x25_remove_route(struct x25_route
*rt
)
82 static int x25_del_route(struct x25_address
*address
, unsigned int sigdigits
,
83 struct net_device
*dev
)
86 struct list_head
*entry
;
89 write_lock_bh(&x25_route_list_lock
);
91 list_for_each(entry
, &x25_route_list
) {
92 rt
= list_entry(entry
, struct x25_route
, node
);
94 if (!memcmp(&rt
->address
, address
, sigdigits
) &&
95 rt
->sigdigits
== sigdigits
&& rt
->dev
== dev
) {
96 __x25_remove_route(rt
);
102 write_unlock_bh(&x25_route_list_lock
);
107 * A device has been removed, remove its routes.
109 void x25_route_device_down(struct net_device
*dev
)
111 struct x25_route
*rt
;
112 struct list_head
*entry
, *tmp
;
114 write_lock_bh(&x25_route_list_lock
);
116 list_for_each_safe(entry
, tmp
, &x25_route_list
) {
117 rt
= list_entry(entry
, struct x25_route
, node
);
120 __x25_remove_route(rt
);
122 write_unlock_bh(&x25_route_list_lock
);
124 /* Remove any related forwarding */
125 x25_clear_forward_by_dev(dev
);
129 * Check that the device given is a valid X.25 interface that is "up".
131 struct net_device
*x25_dev_get(char *devname
)
133 struct net_device
*dev
= dev_get_by_name(&init_net
, devname
);
136 (!(dev
->flags
& IFF_UP
) || (dev
->type
!= ARPHRD_X25
137 #if IS_ENABLED(CONFIG_LLC)
138 && dev
->type
!= ARPHRD_ETHER
149 * x25_get_route - Find a route given an X.25 address.
150 * @addr - address to find a route for
152 * Find a route given an X.25 address.
154 struct x25_route
*x25_get_route(struct x25_address
*addr
)
156 struct x25_route
*rt
, *use
= NULL
;
157 struct list_head
*entry
;
159 read_lock_bh(&x25_route_list_lock
);
161 list_for_each(entry
, &x25_route_list
) {
162 rt
= list_entry(entry
, struct x25_route
, node
);
164 if (!memcmp(&rt
->address
, addr
, rt
->sigdigits
)) {
167 else if (rt
->sigdigits
> use
->sigdigits
)
175 read_unlock_bh(&x25_route_list_lock
);
180 * Handle the ioctls that control the routing functions.
182 int x25_route_ioctl(unsigned int cmd
, void __user
*arg
)
184 struct x25_route_struct rt
;
185 struct net_device
*dev
;
188 if (cmd
!= SIOCADDRT
&& cmd
!= SIOCDELRT
)
192 if (copy_from_user(&rt
, arg
, sizeof(rt
)))
196 if (rt
.sigdigits
> 15)
199 dev
= x25_dev_get(rt
.device
);
203 if (cmd
== SIOCADDRT
)
204 rc
= x25_add_route(&rt
.address
, rt
.sigdigits
, dev
);
206 rc
= x25_del_route(&rt
.address
, rt
.sigdigits
, dev
);
213 * Release all memory associated with X.25 routing structures.
215 void __exit
x25_route_free(void)
217 struct x25_route
*rt
;
218 struct list_head
*entry
, *tmp
;
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
);
225 write_unlock_bh(&x25_route_list_lock
);