1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * X.25 Packet Layer release 002
5 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new releases, misbehave and/or generally
7 * screw up. It might even work.
9 * This code REQUIRES 2.1.15 or higher
12 * X.25 001 Jonathan Naylor Started coding.
15 #include <linux/if_arp.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
20 LIST_HEAD(x25_route_list);
21 DEFINE_RWLOCK(x25_route_list_lock);
26 static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
27 struct net_device *dev)
30 struct list_head *entry;
33 write_lock_bh(&x25_route_list_lock);
35 list_for_each(entry, &x25_route_list) {
36 rt = list_entry(entry, struct x25_route, node);
38 if (!memcmp(&rt->address, address, sigdigits) &&
39 rt->sigdigits == sigdigits)
43 rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
48 strcpy(rt->address.x25_addr, "000000000000000");
49 memcpy(rt->address.x25_addr, address->x25_addr, sigdigits);
51 rt->sigdigits = sigdigits;
53 refcount_set(&rt->refcnt, 1);
55 list_add(&rt->node, &x25_route_list);
58 write_unlock_bh(&x25_route_list_lock);
63 * __x25_remove_route - remove route from x25_route_list
64 * @rt: route to remove
66 * Remove route from x25_route_list. If it was there.
67 * Caller must hold x25_route_list_lock.
69 static void __x25_remove_route(struct x25_route *rt)
77 static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
78 struct net_device *dev)
81 struct list_head *entry;
84 write_lock_bh(&x25_route_list_lock);
86 list_for_each(entry, &x25_route_list) {
87 rt = list_entry(entry, struct x25_route, node);
89 if (!memcmp(&rt->address, address, sigdigits) &&
90 rt->sigdigits == sigdigits && rt->dev == dev) {
91 __x25_remove_route(rt);
97 write_unlock_bh(&x25_route_list_lock);
102 * A device has been removed, remove its routes.
104 void x25_route_device_down(struct net_device *dev)
106 struct x25_route *rt;
107 struct list_head *entry, *tmp;
109 write_lock_bh(&x25_route_list_lock);
111 list_for_each_safe(entry, tmp, &x25_route_list) {
112 rt = list_entry(entry, struct x25_route, node);
115 __x25_remove_route(rt);
117 write_unlock_bh(&x25_route_list_lock);
119 /* Remove any related forwarding */
120 x25_clear_forward_by_dev(dev);
124 * Check that the device given is a valid X.25 interface that is "up".
126 struct net_device *x25_dev_get(char *devname)
128 struct net_device *dev = dev_get_by_name(&init_net, devname);
131 (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
132 #if IS_ENABLED(CONFIG_LLC)
133 && dev->type != ARPHRD_ETHER
144 * x25_get_route - Find a route given an X.25 address.
145 * @addr: - address to find a route for
147 * Find a route given an X.25 address.
149 struct x25_route *x25_get_route(struct x25_address *addr)
151 struct x25_route *rt, *use = NULL;
152 struct list_head *entry;
154 read_lock_bh(&x25_route_list_lock);
156 list_for_each(entry, &x25_route_list) {
157 rt = list_entry(entry, struct x25_route, node);
159 if (!memcmp(&rt->address, addr, rt->sigdigits)) {
162 else if (rt->sigdigits > use->sigdigits)
170 read_unlock_bh(&x25_route_list_lock);
175 * Handle the ioctls that control the routing functions.
177 int x25_route_ioctl(unsigned int cmd, void __user *arg)
179 struct x25_route_struct rt;
180 struct net_device *dev;
183 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
187 if (copy_from_user(&rt, arg, sizeof(rt)))
191 if (rt.sigdigits > 15)
194 dev = x25_dev_get(rt.device);
198 if (cmd == SIOCADDRT)
199 rc = x25_add_route(&rt.address, rt.sigdigits, dev);
201 rc = x25_del_route(&rt.address, rt.sigdigits, dev);
208 * Release all memory associated with X.25 routing structures.
210 void __exit x25_route_free(void)
212 struct x25_route *rt;
213 struct list_head *entry, *tmp;
215 write_lock_bh(&x25_route_list_lock);
216 list_for_each_safe(entry, tmp, &x25_route_list) {
217 rt = list_entry(entry, struct x25_route, node);
218 __x25_remove_route(rt);
220 write_unlock_bh(&x25_route_list_lock);