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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 | ||
de68d100 MS |
120 | /** |
121 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
122 | * interface | |
123 | * @net_device: the device to check | |
124 | * | |
125 | * Returns true if the net device is a 802.11 wireless device, false otherwise. | |
126 | */ | |
127 | static bool batadv_is_wifi_netdev(struct net_device *net_device) | |
128 | { | |
129 | #ifdef CONFIG_WIRELESS_EXT | |
130 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
131 | * check for wireless_handlers != NULL | |
132 | */ | |
133 | if (net_device->wireless_handlers) | |
134 | return true; | |
135 | #endif | |
136 | ||
137 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
138 | if (net_device->ieee80211_ptr) | |
139 | return true; | |
140 | ||
141 | return false; | |
142 | } | |
143 | ||
144 | /** | |
145 | * batadv_is_wifi_iface - check if the given interface represented by ifindex | |
146 | * is a wifi interface | |
147 | * @ifindex: interface index to check | |
148 | * | |
149 | * Returns true if the interface represented by ifindex is a 802.11 wireless | |
150 | * device, false otherwise. | |
151 | */ | |
152 | bool batadv_is_wifi_iface(int ifindex) | |
153 | { | |
154 | struct net_device *net_device = NULL; | |
155 | bool ret = false; | |
156 | ||
157 | if (ifindex == BATADV_NULL_IFINDEX) | |
158 | goto out; | |
159 | ||
160 | net_device = dev_get_by_index(&init_net, ifindex); | |
161 | if (!net_device) | |
162 | goto out; | |
163 | ||
164 | ret = batadv_is_wifi_netdev(net_device); | |
165 | ||
166 | out: | |
167 | if (net_device) | |
168 | dev_put(net_device); | |
169 | return ret; | |
170 | } | |
171 | ||
56303d34 | 172 | static struct batadv_hard_iface * |
18a1cb6e | 173 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 174 | { |
56303d34 | 175 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
176 | |
177 | rcu_read_lock(); | |
3193e8fd | 178 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 179 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
180 | continue; |
181 | ||
e9a4f295 | 182 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 183 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
184 | goto out; |
185 | } | |
186 | ||
e6c10f43 | 187 | hard_iface = NULL; |
c6c8fea2 SE |
188 | |
189 | out: | |
c6c8fea2 | 190 | rcu_read_unlock(); |
e6c10f43 | 191 | return hard_iface; |
c6c8fea2 SE |
192 | } |
193 | ||
56303d34 SE |
194 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
195 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 196 | { |
96412690 | 197 | struct batadv_vis_packet *vis_packet; |
56303d34 | 198 | struct batadv_hard_iface *primary_if; |
807736f6 | 199 | struct sk_buff *skb; |
32ae9b22 | 200 | |
e5d89254 | 201 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
202 | if (!primary_if) |
203 | goto out; | |
c6c8fea2 | 204 | |
785ea114 AQ |
205 | batadv_dat_init_own_addr(bat_priv, primary_if); |
206 | ||
807736f6 SE |
207 | skb = bat_priv->vis.my_info->skb_packet; |
208 | vis_packet = (struct batadv_vis_packet *)skb->data; | |
32ae9b22 | 209 | memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 210 | memcpy(vis_packet->sender_orig, |
32ae9b22 ML |
211 | primary_if->net_dev->dev_addr, ETH_ALEN); |
212 | ||
08adf151 | 213 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
214 | out: |
215 | if (primary_if) | |
e5d89254 | 216 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
217 | } |
218 | ||
56303d34 SE |
219 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
220 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 221 | { |
56303d34 | 222 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 223 | |
c3caf519 | 224 | ASSERT_RTNL(); |
c6c8fea2 | 225 | |
32ae9b22 ML |
226 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
227 | new_hard_iface = NULL; | |
c6c8fea2 | 228 | |
728cbc6a | 229 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 230 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 231 | |
32ae9b22 | 232 | if (!new_hard_iface) |
23721387 | 233 | goto out; |
32ae9b22 | 234 | |
cd8b78e7 | 235 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 236 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
237 | |
238 | out: | |
239 | if (curr_hard_iface) | |
e5d89254 | 240 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
241 | } |
242 | ||
56303d34 SE |
243 | static bool |
244 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 245 | { |
e6c10f43 | 246 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
247 | return true; |
248 | ||
249 | return false; | |
250 | } | |
251 | ||
18a1cb6e | 252 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 253 | { |
56303d34 | 254 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
255 | |
256 | rcu_read_lock(); | |
3193e8fd | 257 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
258 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
259 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
260 | continue; |
261 | ||
e6c10f43 | 262 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
263 | continue; |
264 | ||
1eda58bf SE |
265 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
266 | net_dev->dev_addr)) | |
c6c8fea2 SE |
267 | continue; |
268 | ||
67969581 SE |
269 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
270 | net_dev->dev_addr, hard_iface->net_dev->name); | |
271 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
272 | } |
273 | rcu_read_unlock(); | |
274 | } | |
275 | ||
9563877e | 276 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 277 | { |
56303d34 SE |
278 | const struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
279 | const struct batadv_hard_iface *hard_iface; | |
c6c8fea2 | 280 | /* allow big frames if all devices are capable to do so |
9cfc7bd6 SE |
281 | * (have MTU > 1500 + BAT_HEADER_LEN) |
282 | */ | |
c6c8fea2 SE |
283 | int min_mtu = ETH_DATA_LEN; |
284 | ||
285 | if (atomic_read(&bat_priv->fragmentation)) | |
286 | goto out; | |
287 | ||
288 | rcu_read_lock(); | |
3193e8fd | 289 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
290 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
291 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
292 | continue; |
293 | ||
e6c10f43 | 294 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
295 | continue; |
296 | ||
c11fdfae SE |
297 | min_mtu = min_t(int, |
298 | hard_iface->net_dev->mtu - BATADV_HEADER_LEN, | |
c6c8fea2 SE |
299 | min_mtu); |
300 | } | |
301 | rcu_read_unlock(); | |
302 | out: | |
303 | return min_mtu; | |
304 | } | |
305 | ||
306 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 307 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 SE |
308 | { |
309 | int min_mtu; | |
310 | ||
9563877e | 311 | min_mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 SE |
312 | if (soft_iface->mtu != min_mtu) |
313 | soft_iface->mtu = min_mtu; | |
314 | } | |
315 | ||
56303d34 SE |
316 | static void |
317 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 318 | { |
56303d34 SE |
319 | struct batadv_priv *bat_priv; |
320 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 321 | |
e9a4f295 | 322 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 323 | goto out; |
c6c8fea2 | 324 | |
e6c10f43 | 325 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 326 | |
c3229398 | 327 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 328 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 329 | |
9cfc7bd6 | 330 | /* the first active interface becomes our primary interface or |
015758d0 | 331 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 332 | */ |
e5d89254 | 333 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 334 | if (!primary_if) |
18a1cb6e | 335 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 336 | |
3e34819e SE |
337 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
338 | hard_iface->net_dev->name); | |
c6c8fea2 | 339 | |
9563877e | 340 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
341 | |
342 | out: | |
343 | if (primary_if) | |
e5d89254 | 344 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
345 | } |
346 | ||
56303d34 SE |
347 | static void |
348 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 349 | { |
e9a4f295 SE |
350 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
351 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
352 | return; |
353 | ||
e9a4f295 | 354 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 355 | |
3e34819e SE |
356 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
357 | hard_iface->net_dev->name); | |
c6c8fea2 | 358 | |
9563877e | 359 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
360 | } |
361 | ||
cb4b0d48 AQ |
362 | /** |
363 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
364 | * @slave: the interface enslaved in another master | |
365 | * @master: the master from which slave has to be removed | |
366 | * | |
367 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
368 | * is free'd and master can correctly change its internal state. | |
369 | * Return 0 on success, a negative value representing the error otherwise | |
370 | */ | |
371 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
372 | struct net_device *master) | |
373 | { | |
374 | int ret; | |
375 | ||
376 | if (!master) | |
377 | return 0; | |
378 | ||
379 | ret = -EBUSY; | |
380 | if (master->netdev_ops->ndo_del_slave) | |
381 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
56303d34 | 386 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 387 | const char *iface_name) |
c6c8fea2 | 388 | { |
56303d34 | 389 | struct batadv_priv *bat_priv; |
cb4b0d48 | 390 | struct net_device *soft_iface, *master; |
af5d4f77 | 391 | __be16 ethertype = __constant_htons(ETH_P_BATMAN); |
e44d8fe2 | 392 | int ret; |
c6c8fea2 | 393 | |
e9a4f295 | 394 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
395 | goto out; |
396 | ||
e6c10f43 | 397 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
398 | goto out; |
399 | ||
e44d8fe2 | 400 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 401 | |
e44d8fe2 | 402 | if (!soft_iface) { |
04b482a2 | 403 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 404 | |
e44d8fe2 SE |
405 | if (!soft_iface) { |
406 | ret = -ENOMEM; | |
c6c8fea2 | 407 | goto err; |
e44d8fe2 | 408 | } |
c6c8fea2 SE |
409 | |
410 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
411 | dev_hold(soft_iface); |
412 | } | |
413 | ||
04b482a2 | 414 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 415 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 416 | soft_iface->name); |
e44d8fe2 | 417 | ret = -EINVAL; |
77af7575 | 418 | goto err_dev; |
c6c8fea2 SE |
419 | } |
420 | ||
cb4b0d48 AQ |
421 | /* check if the interface is enslaved in another virtual one and |
422 | * in that case unlink it first | |
423 | */ | |
424 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
425 | ret = batadv_master_del_slave(hard_iface, master); | |
426 | if (ret) | |
427 | goto err_dev; | |
428 | ||
e44d8fe2 | 429 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 430 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 431 | |
3dbd550b SE |
432 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
433 | if (ret) | |
434 | goto err_dev; | |
435 | ||
77af7575 | 436 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 437 | if (ret < 0) |
3dbd550b | 438 | goto err_upper; |
c6c8fea2 | 439 | |
e6c10f43 | 440 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 441 | bat_priv->num_ifaces++; |
e9a4f295 | 442 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
443 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
444 | if (ret < 0) { | |
445 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
446 | bat_priv->num_ifaces--; | |
447 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 448 | goto err_upper; |
62446307 | 449 | } |
c6c8fea2 | 450 | |
7e071c79 | 451 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 452 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
453 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
454 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 455 | |
e6c10f43 | 456 | atomic_set(&hard_iface->frag_seqno, 1); |
3e34819e SE |
457 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
458 | hard_iface->net_dev->name); | |
c6c8fea2 | 459 | |
0aca2369 SE |
460 | if (atomic_read(&bat_priv->fragmentation) && |
461 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
462 | batadv_info(hard_iface->soft_iface, |
463 | "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", | |
464 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 465 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 466 | |
0aca2369 SE |
467 | if (!atomic_read(&bat_priv->fragmentation) && |
468 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
469 | batadv_info(hard_iface->soft_iface, |
470 | "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", | |
471 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 472 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 473 | |
18a1cb6e SE |
474 | if (batadv_hardif_is_iface_up(hard_iface)) |
475 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 476 | else |
3e34819e SE |
477 | batadv_err(hard_iface->soft_iface, |
478 | "Not using interface %s (retrying later): interface not active\n", | |
479 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
480 | |
481 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 482 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
483 | |
484 | out: | |
485 | return 0; | |
486 | ||
3dbd550b SE |
487 | err_upper: |
488 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 489 | err_dev: |
3dbd550b | 490 | hard_iface->soft_iface = NULL; |
77af7575 | 491 | dev_put(soft_iface); |
c6c8fea2 | 492 | err: |
e5d89254 | 493 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 494 | return ret; |
c6c8fea2 SE |
495 | } |
496 | ||
a15fd361 SE |
497 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
498 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 499 | { |
56303d34 SE |
500 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
501 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 502 | |
e9a4f295 | 503 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 504 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 505 | |
e9a4f295 | 506 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 507 | goto out; |
c6c8fea2 | 508 | |
3e34819e SE |
509 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
510 | hard_iface->net_dev->name); | |
e6c10f43 | 511 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
512 | |
513 | bat_priv->num_ifaces--; | |
7d211efc | 514 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 515 | |
e5d89254 | 516 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 517 | if (hard_iface == primary_if) { |
56303d34 | 518 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 519 | |
18a1cb6e SE |
520 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
521 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
522 | |
523 | if (new_if) | |
e5d89254 | 524 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
525 | } |
526 | ||
00a50076 | 527 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 528 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 529 | |
e6c10f43 | 530 | /* delete all references to this hard_iface */ |
7d211efc | 531 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 532 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 533 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
534 | |
535 | /* nobody uses this interface anymore */ | |
a15fd361 | 536 | if (!bat_priv->num_ifaces && autodel == BATADV_IF_CLEANUP_AUTO) |
e07932ae | 537 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); |
c6c8fea2 | 538 | |
3dbd550b | 539 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
e6c10f43 | 540 | hard_iface->soft_iface = NULL; |
e5d89254 | 541 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
542 | |
543 | out: | |
544 | if (primary_if) | |
e5d89254 | 545 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
546 | } |
547 | ||
5bc44dc8 SW |
548 | /** |
549 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
550 | * @work: work queue item | |
551 | * | |
552 | * Free the parts of the hard interface which can not be removed under | |
553 | * rtnl lock (to prevent deadlock situations). | |
554 | */ | |
555 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
556 | { | |
557 | struct batadv_hard_iface *hard_iface; | |
558 | ||
559 | hard_iface = container_of(work, struct batadv_hard_iface, | |
560 | cleanup_work); | |
561 | ||
562 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
563 | batadv_hardif_free_ref(hard_iface); | |
564 | } | |
565 | ||
56303d34 | 566 | static struct batadv_hard_iface * |
18a1cb6e | 567 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 568 | { |
56303d34 | 569 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
570 | int ret; |
571 | ||
c3caf519 SE |
572 | ASSERT_RTNL(); |
573 | ||
18a1cb6e | 574 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
575 | if (ret != 1) |
576 | goto out; | |
577 | ||
578 | dev_hold(net_dev); | |
579 | ||
704509b8 | 580 | hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 581 | if (!hard_iface) |
c6c8fea2 | 582 | goto release_dev; |
c6c8fea2 | 583 | |
5853e22c | 584 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
585 | if (ret) |
586 | goto free_if; | |
587 | ||
e6c10f43 ML |
588 | hard_iface->if_num = -1; |
589 | hard_iface->net_dev = net_dev; | |
590 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 591 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
e6c10f43 | 592 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
593 | INIT_WORK(&hard_iface->cleanup_work, |
594 | batadv_hardif_remove_interface_finish); | |
595 | ||
ed75ccbe | 596 | /* extra reference for return */ |
e6c10f43 | 597 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 598 | |
18a1cb6e | 599 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 600 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 601 | |
9cfc7bd6 | 602 | /* This can't be called via a bat_priv callback because |
8140625e ML |
603 | * we have no bat_priv yet. |
604 | */ | |
14511519 ML |
605 | atomic_set(&hard_iface->bat_iv.ogm_seqno, 1); |
606 | hard_iface->bat_iv.ogm_buff = NULL; | |
8140625e | 607 | |
e6c10f43 | 608 | return hard_iface; |
c6c8fea2 SE |
609 | |
610 | free_if: | |
e6c10f43 | 611 | kfree(hard_iface); |
c6c8fea2 SE |
612 | release_dev: |
613 | dev_put(net_dev); | |
614 | out: | |
615 | return NULL; | |
616 | } | |
617 | ||
56303d34 | 618 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 619 | { |
c3caf519 SE |
620 | ASSERT_RTNL(); |
621 | ||
c6c8fea2 | 622 | /* first deactivate interface */ |
e9a4f295 | 623 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
624 | batadv_hardif_disable_interface(hard_iface, |
625 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 626 | |
e9a4f295 | 627 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
628 | return; |
629 | ||
e9a4f295 | 630 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 631 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
632 | } |
633 | ||
9563877e | 634 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 635 | { |
56303d34 | 636 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 637 | |
c3caf519 | 638 | rtnl_lock(); |
e6c10f43 | 639 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 640 | &batadv_hardif_list, list) { |
e6c10f43 | 641 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 642 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
643 | } |
644 | rtnl_unlock(); | |
645 | } | |
646 | ||
18a1cb6e SE |
647 | static int batadv_hard_if_event(struct notifier_block *this, |
648 | unsigned long event, void *ptr) | |
c6c8fea2 | 649 | { |
351638e7 | 650 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
651 | struct batadv_hard_iface *hard_iface; |
652 | struct batadv_hard_iface *primary_if = NULL; | |
653 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 654 | |
37130293 SE |
655 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
656 | batadv_sysfs_add_meshif(net_dev); | |
657 | return NOTIFY_DONE; | |
658 | } | |
659 | ||
56303d34 | 660 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 661 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 662 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 663 | |
e6c10f43 | 664 | if (!hard_iface) |
c6c8fea2 SE |
665 | goto out; |
666 | ||
667 | switch (event) { | |
668 | case NETDEV_UP: | |
18a1cb6e | 669 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
670 | break; |
671 | case NETDEV_GOING_DOWN: | |
672 | case NETDEV_DOWN: | |
18a1cb6e | 673 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
674 | break; |
675 | case NETDEV_UNREGISTER: | |
e6c10f43 | 676 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 677 | |
18a1cb6e | 678 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
679 | break; |
680 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 681 | if (hard_iface->soft_iface) |
9563877e | 682 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
683 | break; |
684 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 685 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
686 | goto hardif_put; |
687 | ||
18a1cb6e | 688 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 689 | |
e6c10f43 | 690 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 691 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 692 | |
e5d89254 | 693 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
694 | if (!primary_if) |
695 | goto hardif_put; | |
696 | ||
697 | if (hard_iface == primary_if) | |
18a1cb6e | 698 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
699 | break; |
700 | default: | |
701 | break; | |
f81c6224 | 702 | } |
c6c8fea2 SE |
703 | |
704 | hardif_put: | |
e5d89254 | 705 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 706 | out: |
32ae9b22 | 707 | if (primary_if) |
e5d89254 | 708 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
709 | return NOTIFY_DONE; |
710 | } | |
711 | ||
9563877e | 712 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 713 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 714 | }; |