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0b873931 | 1 | /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
785ea114 | 21 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
22 | #include "hard-interface.h" |
23 | #include "soft-interface.h" | |
24 | #include "send.h" | |
25 | #include "translation-table.h" | |
26 | #include "routing.h" | |
b706b13b | 27 | #include "sysfs.h" |
c6c8fea2 SE |
28 | #include "originator.h" |
29 | #include "hash.h" | |
23721387 | 30 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
31 | |
32 | #include <linux/if_arp.h> | |
af5d4f77 | 33 | #include <linux/if_ether.h> |
c6c8fea2 | 34 | |
9563877e | 35 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 36 | { |
56303d34 | 37 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 38 | |
56303d34 | 39 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
40 | dev_put(hard_iface->net_dev); |
41 | kfree(hard_iface); | |
c6c8fea2 SE |
42 | } |
43 | ||
56303d34 SE |
44 | struct batadv_hard_iface * |
45 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 46 | { |
56303d34 | 47 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
48 | |
49 | rcu_read_lock(); | |
3193e8fd | 50 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
51 | if (hard_iface->net_dev == net_dev && |
52 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
53 | goto out; |
54 | } | |
55 | ||
e6c10f43 | 56 | hard_iface = NULL; |
c6c8fea2 SE |
57 | |
58 | out: | |
c6c8fea2 | 59 | rcu_read_unlock(); |
e6c10f43 | 60 | return hard_iface; |
c6c8fea2 SE |
61 | } |
62 | ||
b7eddd0b AQ |
63 | /** |
64 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
65 | * @net_dev: the device to check | |
66 | * | |
67 | * If the user creates any virtual device on top of a batman-adv interface, it | |
68 | * is important to prevent this new interface to be used to create a new mesh | |
69 | * network (this behaviour would lead to a batman-over-batman configuration). | |
70 | * This function recursively checks all the fathers of the device passed as | |
71 | * argument looking for a batman-adv soft interface. | |
72 | * | |
73 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
74 | * if it is a batman-adv interface itself), false otherwise | |
75 | */ | |
76 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
77 | { | |
78 | struct net_device *parent_dev; | |
79 | bool ret; | |
80 | ||
81 | /* check if this is a batman-adv mesh interface */ | |
82 | if (batadv_softif_is_valid(net_dev)) | |
83 | return true; | |
84 | ||
85 | /* no more parents..stop recursion */ | |
86 | if (net_dev->iflink == net_dev->ifindex) | |
87 | return false; | |
88 | ||
89 | /* recurse over the parent device */ | |
90 | parent_dev = dev_get_by_index(&init_net, net_dev->iflink); | |
91 | /* if we got a NULL parent_dev there is something broken.. */ | |
92 | if (WARN(!parent_dev, "Cannot find parent device")) | |
93 | return false; | |
94 | ||
95 | ret = batadv_is_on_batman_iface(parent_dev); | |
96 | ||
97 | if (parent_dev) | |
98 | dev_put(parent_dev); | |
99 | return ret; | |
100 | } | |
101 | ||
18a1cb6e | 102 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
103 | { |
104 | if (net_dev->flags & IFF_LOOPBACK) | |
105 | return 0; | |
106 | ||
107 | if (net_dev->type != ARPHRD_ETHER) | |
108 | return 0; | |
109 | ||
110 | if (net_dev->addr_len != ETH_ALEN) | |
111 | return 0; | |
112 | ||
113 | /* no batman over batman */ | |
b7eddd0b | 114 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 115 | return 0; |
c6c8fea2 | 116 | |
c6c8fea2 SE |
117 | return 1; |
118 | } | |
119 | ||
56303d34 | 120 | static struct batadv_hard_iface * |
18a1cb6e | 121 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 122 | { |
56303d34 | 123 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
124 | |
125 | rcu_read_lock(); | |
3193e8fd | 126 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 127 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
128 | continue; |
129 | ||
e9a4f295 | 130 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 131 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
132 | goto out; |
133 | } | |
134 | ||
e6c10f43 | 135 | hard_iface = NULL; |
c6c8fea2 SE |
136 | |
137 | out: | |
c6c8fea2 | 138 | rcu_read_unlock(); |
e6c10f43 | 139 | return hard_iface; |
c6c8fea2 SE |
140 | } |
141 | ||
56303d34 SE |
142 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
143 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 144 | { |
96412690 | 145 | struct batadv_vis_packet *vis_packet; |
56303d34 | 146 | struct batadv_hard_iface *primary_if; |
807736f6 | 147 | struct sk_buff *skb; |
32ae9b22 | 148 | |
e5d89254 | 149 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
150 | if (!primary_if) |
151 | goto out; | |
c6c8fea2 | 152 | |
785ea114 AQ |
153 | batadv_dat_init_own_addr(bat_priv, primary_if); |
154 | ||
807736f6 SE |
155 | skb = bat_priv->vis.my_info->skb_packet; |
156 | vis_packet = (struct batadv_vis_packet *)skb->data; | |
32ae9b22 | 157 | memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 158 | memcpy(vis_packet->sender_orig, |
32ae9b22 ML |
159 | primary_if->net_dev->dev_addr, ETH_ALEN); |
160 | ||
08adf151 | 161 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
162 | out: |
163 | if (primary_if) | |
e5d89254 | 164 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
165 | } |
166 | ||
56303d34 SE |
167 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
168 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 169 | { |
56303d34 | 170 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 171 | |
c3caf519 | 172 | ASSERT_RTNL(); |
c6c8fea2 | 173 | |
32ae9b22 ML |
174 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
175 | new_hard_iface = NULL; | |
c6c8fea2 | 176 | |
728cbc6a | 177 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 178 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 179 | |
32ae9b22 | 180 | if (!new_hard_iface) |
23721387 | 181 | goto out; |
32ae9b22 | 182 | |
cd8b78e7 | 183 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 184 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
185 | |
186 | out: | |
187 | if (curr_hard_iface) | |
e5d89254 | 188 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
189 | } |
190 | ||
56303d34 SE |
191 | static bool |
192 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 193 | { |
e6c10f43 | 194 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
195 | return true; |
196 | ||
197 | return false; | |
198 | } | |
199 | ||
18a1cb6e | 200 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 201 | { |
56303d34 | 202 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
203 | |
204 | rcu_read_lock(); | |
3193e8fd | 205 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
206 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
207 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
208 | continue; |
209 | ||
e6c10f43 | 210 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
211 | continue; |
212 | ||
1eda58bf SE |
213 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
214 | net_dev->dev_addr)) | |
c6c8fea2 SE |
215 | continue; |
216 | ||
67969581 SE |
217 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
218 | net_dev->dev_addr, hard_iface->net_dev->name); | |
219 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
220 | } |
221 | rcu_read_unlock(); | |
222 | } | |
223 | ||
9563877e | 224 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 225 | { |
56303d34 SE |
226 | const struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
227 | const struct batadv_hard_iface *hard_iface; | |
c6c8fea2 | 228 | /* allow big frames if all devices are capable to do so |
9cfc7bd6 SE |
229 | * (have MTU > 1500 + BAT_HEADER_LEN) |
230 | */ | |
c6c8fea2 SE |
231 | int min_mtu = ETH_DATA_LEN; |
232 | ||
233 | if (atomic_read(&bat_priv->fragmentation)) | |
234 | goto out; | |
235 | ||
236 | rcu_read_lock(); | |
3193e8fd | 237 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
238 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
239 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
240 | continue; |
241 | ||
e6c10f43 | 242 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
243 | continue; |
244 | ||
c11fdfae SE |
245 | min_mtu = min_t(int, |
246 | hard_iface->net_dev->mtu - BATADV_HEADER_LEN, | |
c6c8fea2 SE |
247 | min_mtu); |
248 | } | |
249 | rcu_read_unlock(); | |
250 | out: | |
251 | return min_mtu; | |
252 | } | |
253 | ||
254 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 255 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 SE |
256 | { |
257 | int min_mtu; | |
258 | ||
9563877e | 259 | min_mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 SE |
260 | if (soft_iface->mtu != min_mtu) |
261 | soft_iface->mtu = min_mtu; | |
262 | } | |
263 | ||
56303d34 SE |
264 | static void |
265 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 266 | { |
56303d34 SE |
267 | struct batadv_priv *bat_priv; |
268 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 269 | |
e9a4f295 | 270 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 271 | goto out; |
c6c8fea2 | 272 | |
e6c10f43 | 273 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 274 | |
c3229398 | 275 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 276 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 277 | |
9cfc7bd6 | 278 | /* the first active interface becomes our primary interface or |
015758d0 | 279 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 280 | */ |
e5d89254 | 281 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 282 | if (!primary_if) |
18a1cb6e | 283 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 284 | |
3e34819e SE |
285 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
286 | hard_iface->net_dev->name); | |
c6c8fea2 | 287 | |
9563877e | 288 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
289 | |
290 | out: | |
291 | if (primary_if) | |
e5d89254 | 292 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
293 | } |
294 | ||
56303d34 SE |
295 | static void |
296 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 297 | { |
e9a4f295 SE |
298 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
299 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
300 | return; |
301 | ||
e9a4f295 | 302 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 303 | |
3e34819e SE |
304 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
305 | hard_iface->net_dev->name); | |
c6c8fea2 | 306 | |
9563877e | 307 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
308 | } |
309 | ||
cb4b0d48 AQ |
310 | /** |
311 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
312 | * @slave: the interface enslaved in another master | |
313 | * @master: the master from which slave has to be removed | |
314 | * | |
315 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
316 | * is free'd and master can correctly change its internal state. | |
317 | * Return 0 on success, a negative value representing the error otherwise | |
318 | */ | |
319 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
320 | struct net_device *master) | |
321 | { | |
322 | int ret; | |
323 | ||
324 | if (!master) | |
325 | return 0; | |
326 | ||
327 | ret = -EBUSY; | |
328 | if (master->netdev_ops->ndo_del_slave) | |
329 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
330 | ||
331 | return ret; | |
332 | } | |
333 | ||
56303d34 | 334 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 335 | const char *iface_name) |
c6c8fea2 | 336 | { |
56303d34 | 337 | struct batadv_priv *bat_priv; |
cb4b0d48 | 338 | struct net_device *soft_iface, *master; |
af5d4f77 | 339 | __be16 ethertype = __constant_htons(ETH_P_BATMAN); |
e44d8fe2 | 340 | int ret; |
c6c8fea2 | 341 | |
e9a4f295 | 342 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
343 | goto out; |
344 | ||
e6c10f43 | 345 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
346 | goto out; |
347 | ||
e44d8fe2 | 348 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 349 | |
e44d8fe2 | 350 | if (!soft_iface) { |
04b482a2 | 351 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 352 | |
e44d8fe2 SE |
353 | if (!soft_iface) { |
354 | ret = -ENOMEM; | |
c6c8fea2 | 355 | goto err; |
e44d8fe2 | 356 | } |
c6c8fea2 SE |
357 | |
358 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
359 | dev_hold(soft_iface); |
360 | } | |
361 | ||
04b482a2 | 362 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 363 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 364 | soft_iface->name); |
e44d8fe2 | 365 | ret = -EINVAL; |
77af7575 | 366 | goto err_dev; |
c6c8fea2 SE |
367 | } |
368 | ||
cb4b0d48 AQ |
369 | /* check if the interface is enslaved in another virtual one and |
370 | * in that case unlink it first | |
371 | */ | |
372 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
373 | ret = batadv_master_del_slave(hard_iface, master); | |
374 | if (ret) | |
375 | goto err_dev; | |
376 | ||
e44d8fe2 | 377 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 378 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 379 | |
3dbd550b SE |
380 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
381 | if (ret) | |
382 | goto err_dev; | |
383 | ||
77af7575 | 384 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 385 | if (ret < 0) |
3dbd550b | 386 | goto err_upper; |
c6c8fea2 | 387 | |
e6c10f43 | 388 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 389 | bat_priv->num_ifaces++; |
e9a4f295 | 390 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
391 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
392 | if (ret < 0) { | |
393 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
394 | bat_priv->num_ifaces--; | |
395 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 396 | goto err_upper; |
62446307 | 397 | } |
c6c8fea2 | 398 | |
7e071c79 | 399 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 400 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
401 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
402 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 403 | |
e6c10f43 | 404 | atomic_set(&hard_iface->frag_seqno, 1); |
3e34819e SE |
405 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
406 | hard_iface->net_dev->name); | |
c6c8fea2 | 407 | |
0aca2369 SE |
408 | if (atomic_read(&bat_priv->fragmentation) && |
409 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
410 | batadv_info(hard_iface->soft_iface, |
411 | "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n", | |
412 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 413 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 414 | |
0aca2369 SE |
415 | if (!atomic_read(&bat_priv->fragmentation) && |
416 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
417 | batadv_info(hard_iface->soft_iface, |
418 | "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n", | |
419 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 420 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 421 | |
18a1cb6e SE |
422 | if (batadv_hardif_is_iface_up(hard_iface)) |
423 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 424 | else |
3e34819e SE |
425 | batadv_err(hard_iface->soft_iface, |
426 | "Not using interface %s (retrying later): interface not active\n", | |
427 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
428 | |
429 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 430 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
431 | |
432 | out: | |
433 | return 0; | |
434 | ||
3dbd550b SE |
435 | err_upper: |
436 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 437 | err_dev: |
3dbd550b | 438 | hard_iface->soft_iface = NULL; |
77af7575 | 439 | dev_put(soft_iface); |
c6c8fea2 | 440 | err: |
e5d89254 | 441 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 442 | return ret; |
c6c8fea2 SE |
443 | } |
444 | ||
a15fd361 SE |
445 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
446 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 447 | { |
56303d34 SE |
448 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
449 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 450 | |
e9a4f295 | 451 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 452 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 453 | |
e9a4f295 | 454 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 455 | goto out; |
c6c8fea2 | 456 | |
3e34819e SE |
457 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
458 | hard_iface->net_dev->name); | |
e6c10f43 | 459 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
460 | |
461 | bat_priv->num_ifaces--; | |
7d211efc | 462 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 463 | |
e5d89254 | 464 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 465 | if (hard_iface == primary_if) { |
56303d34 | 466 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 467 | |
18a1cb6e SE |
468 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
469 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
470 | |
471 | if (new_if) | |
e5d89254 | 472 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
473 | } |
474 | ||
00a50076 | 475 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 476 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 477 | |
e6c10f43 | 478 | /* delete all references to this hard_iface */ |
7d211efc | 479 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 480 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 481 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
482 | |
483 | /* nobody uses this interface anymore */ | |
a15fd361 | 484 | if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO) |
e07932ae | 485 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); |
c6c8fea2 | 486 | |
3dbd550b | 487 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
e6c10f43 | 488 | hard_iface->soft_iface = NULL; |
e5d89254 | 489 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
490 | |
491 | out: | |
492 | if (primary_if) | |
e5d89254 | 493 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
494 | } |
495 | ||
5bc44dc8 SW |
496 | /** |
497 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
498 | * @work: work queue item | |
499 | * | |
500 | * Free the parts of the hard interface which can not be removed under | |
501 | * rtnl lock (to prevent deadlock situations). | |
502 | */ | |
503 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
504 | { | |
505 | struct batadv_hard_iface *hard_iface; | |
506 | ||
507 | hard_iface = container_of(work, struct batadv_hard_iface, | |
508 | cleanup_work); | |
509 | ||
510 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
511 | batadv_hardif_free_ref(hard_iface); | |
512 | } | |
513 | ||
56303d34 | 514 | static struct batadv_hard_iface * |
18a1cb6e | 515 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 516 | { |
56303d34 | 517 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
518 | int ret; |
519 | ||
c3caf519 SE |
520 | ASSERT_RTNL(); |
521 | ||
18a1cb6e | 522 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
523 | if (ret != 1) |
524 | goto out; | |
525 | ||
526 | dev_hold(net_dev); | |
527 | ||
704509b8 | 528 | hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 529 | if (!hard_iface) |
c6c8fea2 | 530 | goto release_dev; |
c6c8fea2 | 531 | |
5853e22c | 532 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
533 | if (ret) |
534 | goto free_if; | |
535 | ||
e6c10f43 ML |
536 | hard_iface->if_num = -1; |
537 | hard_iface->net_dev = net_dev; | |
538 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 539 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
e6c10f43 | 540 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
541 | INIT_WORK(&hard_iface->cleanup_work, |
542 | batadv_hardif_remove_interface_finish); | |
543 | ||
ed75ccbe | 544 | /* extra reference for return */ |
e6c10f43 | 545 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 546 | |
18a1cb6e | 547 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 548 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 549 | |
9cfc7bd6 | 550 | /* This can't be called via a bat_priv callback because |
8140625e ML |
551 | * we have no bat_priv yet. |
552 | */ | |
14511519 ML |
553 | atomic_set(&hard_iface->bat_iv.ogm_seqno, 1); |
554 | hard_iface->bat_iv.ogm_buff = NULL; | |
8140625e | 555 | |
e6c10f43 | 556 | return hard_iface; |
c6c8fea2 SE |
557 | |
558 | free_if: | |
e6c10f43 | 559 | kfree(hard_iface); |
c6c8fea2 SE |
560 | release_dev: |
561 | dev_put(net_dev); | |
562 | out: | |
563 | return NULL; | |
564 | } | |
565 | ||
56303d34 | 566 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 567 | { |
c3caf519 SE |
568 | ASSERT_RTNL(); |
569 | ||
c6c8fea2 | 570 | /* first deactivate interface */ |
e9a4f295 | 571 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
572 | batadv_hardif_disable_interface(hard_iface, |
573 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 574 | |
e9a4f295 | 575 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
576 | return; |
577 | ||
e9a4f295 | 578 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 579 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
580 | } |
581 | ||
9563877e | 582 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 583 | { |
56303d34 | 584 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 585 | |
c3caf519 | 586 | rtnl_lock(); |
e6c10f43 | 587 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 588 | &batadv_hardif_list, list) { |
e6c10f43 | 589 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 590 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
591 | } |
592 | rtnl_unlock(); | |
593 | } | |
594 | ||
18a1cb6e SE |
595 | static int batadv_hard_if_event(struct notifier_block *this, |
596 | unsigned long event, void *ptr) | |
c6c8fea2 | 597 | { |
5f718c20 | 598 | struct net_device *net_dev = ptr; |
56303d34 SE |
599 | struct batadv_hard_iface *hard_iface; |
600 | struct batadv_hard_iface *primary_if = NULL; | |
601 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 602 | |
37130293 SE |
603 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
604 | batadv_sysfs_add_meshif(net_dev); | |
605 | return NOTIFY_DONE; | |
606 | } | |
607 | ||
56303d34 | 608 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 609 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 610 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 611 | |
e6c10f43 | 612 | if (!hard_iface) |
c6c8fea2 SE |
613 | goto out; |
614 | ||
615 | switch (event) { | |
616 | case NETDEV_UP: | |
18a1cb6e | 617 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
618 | break; |
619 | case NETDEV_GOING_DOWN: | |
620 | case NETDEV_DOWN: | |
18a1cb6e | 621 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
622 | break; |
623 | case NETDEV_UNREGISTER: | |
e6c10f43 | 624 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 625 | |
18a1cb6e | 626 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
627 | break; |
628 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 629 | if (hard_iface->soft_iface) |
9563877e | 630 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
631 | break; |
632 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 633 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
634 | goto hardif_put; |
635 | ||
18a1cb6e | 636 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 637 | |
e6c10f43 | 638 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 639 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 640 | |
e5d89254 | 641 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
642 | if (!primary_if) |
643 | goto hardif_put; | |
644 | ||
645 | if (hard_iface == primary_if) | |
18a1cb6e | 646 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
647 | break; |
648 | default: | |
649 | break; | |
f81c6224 | 650 | } |
c6c8fea2 SE |
651 | |
652 | hardif_put: | |
e5d89254 | 653 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 654 | out: |
32ae9b22 | 655 | if (primary_if) |
e5d89254 | 656 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
657 | return NOTIFY_DONE; |
658 | } | |
659 | ||
bc279080 | 660 | /* This function returns true if the interface represented by ifindex is a |
9cfc7bd6 SE |
661 | * 802.11 wireless device |
662 | */ | |
9563877e | 663 | bool batadv_is_wifi_iface(int ifindex) |
bc279080 AQ |
664 | { |
665 | struct net_device *net_device = NULL; | |
666 | bool ret = false; | |
667 | ||
42d0b044 | 668 | if (ifindex == BATADV_NULL_IFINDEX) |
bc279080 AQ |
669 | goto out; |
670 | ||
671 | net_device = dev_get_by_index(&init_net, ifindex); | |
672 | if (!net_device) | |
673 | goto out; | |
674 | ||
675 | #ifdef CONFIG_WIRELESS_EXT | |
676 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
9cfc7bd6 SE |
677 | * check for wireless_handlers != NULL |
678 | */ | |
bc279080 AQ |
679 | if (net_device->wireless_handlers) |
680 | ret = true; | |
681 | else | |
682 | #endif | |
683 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
684 | if (net_device->ieee80211_ptr) | |
685 | ret = true; | |
686 | out: | |
687 | if (net_device) | |
688 | dev_put(net_device); | |
689 | return ret; | |
690 | } | |
691 | ||
9563877e | 692 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 693 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 694 | }; |