Commit | Line | Data |
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ee5d8f4d | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * X.25 Packet Layer release 002 | |
4 | * | |
5 | * This is ALPHA test software. This code may break your machine, | |
6 | * randomly fail to work with new releases, misbehave and/or generally | |
f8e1d201 | 7 | * screw up. It might even work. |
1da177e4 LT |
8 | * |
9 | * This code REQUIRES 2.1.15 or higher | |
10 | * | |
1da177e4 LT |
11 | * History |
12 | * X.25 001 Jonathan Naylor Started coding. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/if_arp.h> |
16 | #include <linux/init.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <net/x25.h> |
19 | ||
0e3cf7e9 | 20 | LIST_HEAD(x25_route_list); |
1da177e4 LT |
21 | DEFINE_RWLOCK(x25_route_list_lock); |
22 | ||
23 | /* | |
24 | * Add a new route. | |
25 | */ | |
26 | static int x25_add_route(struct x25_address *address, unsigned int sigdigits, | |
27 | struct net_device *dev) | |
28 | { | |
29 | struct x25_route *rt; | |
30 | struct list_head *entry; | |
31 | int rc = -EINVAL; | |
32 | ||
33 | write_lock_bh(&x25_route_list_lock); | |
34 | ||
35 | list_for_each(entry, &x25_route_list) { | |
36 | rt = list_entry(entry, struct x25_route, node); | |
37 | ||
38 | if (!memcmp(&rt->address, address, sigdigits) && | |
39 | rt->sigdigits == sigdigits) | |
40 | goto out; | |
41 | } | |
42 | ||
43 | rt = kmalloc(sizeof(*rt), GFP_ATOMIC); | |
44 | rc = -ENOMEM; | |
45 | if (!rt) | |
46 | goto out; | |
47 | ||
48 | strcpy(rt->address.x25_addr, "000000000000000"); | |
49 | memcpy(rt->address.x25_addr, address->x25_addr, sigdigits); | |
50 | ||
51 | rt->sigdigits = sigdigits; | |
52 | rt->dev = dev; | |
5f9ccf6f | 53 | refcount_set(&rt->refcnt, 1); |
1da177e4 LT |
54 | |
55 | list_add(&rt->node, &x25_route_list); | |
56 | rc = 0; | |
57 | out: | |
58 | write_unlock_bh(&x25_route_list_lock); | |
59 | return rc; | |
60 | } | |
61 | ||
62 | /** | |
63 | * __x25_remove_route - remove route from x25_route_list | |
2c53040f | 64 | * @rt: route to remove |
1da177e4 LT |
65 | * |
66 | * Remove route from x25_route_list. If it was there. | |
67 | * Caller must hold x25_route_list_lock. | |
68 | */ | |
69 | static void __x25_remove_route(struct x25_route *rt) | |
70 | { | |
71 | if (rt->node.next) { | |
72 | list_del(&rt->node); | |
73 | x25_route_put(rt); | |
74 | } | |
75 | } | |
76 | ||
77 | static int x25_del_route(struct x25_address *address, unsigned int sigdigits, | |
78 | struct net_device *dev) | |
79 | { | |
80 | struct x25_route *rt; | |
81 | struct list_head *entry; | |
82 | int rc = -EINVAL; | |
83 | ||
84 | write_lock_bh(&x25_route_list_lock); | |
85 | ||
86 | list_for_each(entry, &x25_route_list) { | |
87 | rt = list_entry(entry, struct x25_route, node); | |
88 | ||
89 | if (!memcmp(&rt->address, address, sigdigits) && | |
90 | rt->sigdigits == sigdigits && rt->dev == dev) { | |
91 | __x25_remove_route(rt); | |
92 | rc = 0; | |
93 | break; | |
94 | } | |
95 | } | |
96 | ||
97 | write_unlock_bh(&x25_route_list_lock); | |
98 | return rc; | |
99 | } | |
100 | ||
101 | /* | |
102 | * A device has been removed, remove its routes. | |
103 | */ | |
104 | void x25_route_device_down(struct net_device *dev) | |
105 | { | |
106 | struct x25_route *rt; | |
107 | struct list_head *entry, *tmp; | |
108 | ||
109 | write_lock_bh(&x25_route_list_lock); | |
110 | ||
111 | list_for_each_safe(entry, tmp, &x25_route_list) { | |
112 | rt = list_entry(entry, struct x25_route, node); | |
113 | ||
114 | if (rt->dev == dev) | |
115 | __x25_remove_route(rt); | |
116 | } | |
117 | write_unlock_bh(&x25_route_list_lock); | |
95a9dc43 AH |
118 | |
119 | /* Remove any related forwarding */ | |
120 | x25_clear_forward_by_dev(dev); | |
1da177e4 LT |
121 | } |
122 | ||
123 | /* | |
124 | * Check that the device given is a valid X.25 interface that is "up". | |
125 | */ | |
126 | struct net_device *x25_dev_get(char *devname) | |
127 | { | |
881d966b | 128 | struct net_device *dev = dev_get_by_name(&init_net, devname); |
1da177e4 LT |
129 | |
130 | if (dev && | |
131 | (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25 | |
29c36262 | 132 | #if IS_ENABLED(CONFIG_LLC) |
1da177e4 LT |
133 | && dev->type != ARPHRD_ETHER |
134 | #endif | |
429d33ac | 135 | ))){ |
1da177e4 | 136 | dev_put(dev); |
429d33ac | 137 | dev = NULL; |
138 | } | |
1da177e4 LT |
139 | |
140 | return dev; | |
141 | } | |
142 | ||
143 | /** | |
144 | * x25_get_route - Find a route given an X.25 address. | |
145 | * @addr - address to find a route for | |
146 | * | |
147 | * Find a route given an X.25 address. | |
148 | */ | |
149 | struct x25_route *x25_get_route(struct x25_address *addr) | |
150 | { | |
151 | struct x25_route *rt, *use = NULL; | |
152 | struct list_head *entry; | |
153 | ||
154 | read_lock_bh(&x25_route_list_lock); | |
155 | ||
156 | list_for_each(entry, &x25_route_list) { | |
157 | rt = list_entry(entry, struct x25_route, node); | |
158 | ||
159 | if (!memcmp(&rt->address, addr, rt->sigdigits)) { | |
160 | if (!use) | |
161 | use = rt; | |
162 | else if (rt->sigdigits > use->sigdigits) | |
163 | use = rt; | |
164 | } | |
165 | } | |
166 | ||
167 | if (use) | |
168 | x25_route_hold(use); | |
169 | ||
170 | read_unlock_bh(&x25_route_list_lock); | |
171 | return use; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Handle the ioctls that control the routing functions. | |
176 | */ | |
177 | int x25_route_ioctl(unsigned int cmd, void __user *arg) | |
178 | { | |
179 | struct x25_route_struct rt; | |
180 | struct net_device *dev; | |
181 | int rc = -EINVAL; | |
182 | ||
183 | if (cmd != SIOCADDRT && cmd != SIOCDELRT) | |
184 | goto out; | |
185 | ||
186 | rc = -EFAULT; | |
187 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
188 | goto out; | |
189 | ||
190 | rc = -EINVAL; | |
091bb8ab | 191 | if (rt.sigdigits > 15) |
1da177e4 LT |
192 | goto out; |
193 | ||
194 | dev = x25_dev_get(rt.device); | |
195 | if (!dev) | |
196 | goto out; | |
197 | ||
198 | if (cmd == SIOCADDRT) | |
199 | rc = x25_add_route(&rt.address, rt.sigdigits, dev); | |
200 | else | |
201 | rc = x25_del_route(&rt.address, rt.sigdigits, dev); | |
202 | dev_put(dev); | |
203 | out: | |
204 | return rc; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Release all memory associated with X.25 routing structures. | |
209 | */ | |
210 | void __exit x25_route_free(void) | |
211 | { | |
212 | struct x25_route *rt; | |
213 | struct list_head *entry, *tmp; | |
214 | ||
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); | |
219 | } | |
220 | write_unlock_bh(&x25_route_list_lock); | |
221 | } |