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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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
18 | #include "main.h" | |
785ea114 | 19 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
20 | #include "hard-interface.h" |
21 | #include "soft-interface.h" | |
22 | #include "send.h" | |
23 | #include "translation-table.h" | |
24 | #include "routing.h" | |
b706b13b | 25 | #include "sysfs.h" |
5bc7c1eb | 26 | #include "debugfs.h" |
c6c8fea2 SE |
27 | #include "originator.h" |
28 | #include "hash.h" | |
23721387 | 29 | #include "bridge_loop_avoidance.h" |
8257f55a | 30 | #include "gateway_client.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 | */ | |
0c69aecc | 127 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 128 | { |
0c69aecc AQ |
129 | if (!net_device) |
130 | return false; | |
131 | ||
de68d100 MS |
132 | #ifdef CONFIG_WIRELESS_EXT |
133 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
134 | * check for wireless_handlers != NULL | |
135 | */ | |
136 | if (net_device->wireless_handlers) | |
137 | return true; | |
138 | #endif | |
139 | ||
140 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
141 | if (net_device->ieee80211_ptr) | |
142 | return true; | |
143 | ||
144 | return false; | |
145 | } | |
146 | ||
56303d34 | 147 | static struct batadv_hard_iface * |
18a1cb6e | 148 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 149 | { |
56303d34 | 150 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
151 | |
152 | rcu_read_lock(); | |
3193e8fd | 153 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 154 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
155 | continue; |
156 | ||
e9a4f295 | 157 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 158 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
159 | goto out; |
160 | } | |
161 | ||
e6c10f43 | 162 | hard_iface = NULL; |
c6c8fea2 SE |
163 | |
164 | out: | |
c6c8fea2 | 165 | rcu_read_unlock(); |
e6c10f43 | 166 | return hard_iface; |
c6c8fea2 SE |
167 | } |
168 | ||
56303d34 SE |
169 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
170 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 171 | { |
56303d34 | 172 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 173 | |
e5d89254 | 174 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
175 | if (!primary_if) |
176 | goto out; | |
c6c8fea2 | 177 | |
785ea114 | 178 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 179 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
180 | out: |
181 | if (primary_if) | |
e5d89254 | 182 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
183 | } |
184 | ||
56303d34 SE |
185 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
186 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 187 | { |
56303d34 | 188 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 189 | |
c3caf519 | 190 | ASSERT_RTNL(); |
c6c8fea2 | 191 | |
32ae9b22 ML |
192 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
193 | new_hard_iface = NULL; | |
c6c8fea2 | 194 | |
728cbc6a | 195 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 196 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 197 | |
32ae9b22 | 198 | if (!new_hard_iface) |
23721387 | 199 | goto out; |
32ae9b22 | 200 | |
cd8b78e7 | 201 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 202 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
203 | |
204 | out: | |
205 | if (curr_hard_iface) | |
e5d89254 | 206 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
207 | } |
208 | ||
56303d34 SE |
209 | static bool |
210 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 211 | { |
e6c10f43 | 212 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
213 | return true; |
214 | ||
215 | return false; | |
216 | } | |
217 | ||
18a1cb6e | 218 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 219 | { |
56303d34 | 220 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
221 | |
222 | rcu_read_lock(); | |
3193e8fd | 223 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
224 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
225 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
226 | continue; |
227 | ||
e6c10f43 | 228 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
229 | continue; |
230 | ||
1eda58bf SE |
231 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
232 | net_dev->dev_addr)) | |
c6c8fea2 SE |
233 | continue; |
234 | ||
67969581 SE |
235 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
236 | net_dev->dev_addr, hard_iface->net_dev->name); | |
237 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
238 | } |
239 | rcu_read_unlock(); | |
240 | } | |
241 | ||
9563877e | 242 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 243 | { |
a19d3d85 | 244 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 245 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 246 | int min_mtu = ETH_DATA_LEN; |
c6c8fea2 SE |
247 | |
248 | rcu_read_lock(); | |
3193e8fd | 249 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
250 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
251 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
252 | continue; |
253 | ||
e6c10f43 | 254 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
255 | continue; |
256 | ||
a19d3d85 | 257 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
258 | } |
259 | rcu_read_unlock(); | |
a19d3d85 ML |
260 | |
261 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
262 | ||
263 | if (atomic_read(&bat_priv->fragmentation) == 0) | |
264 | goto out; | |
265 | ||
266 | /* with fragmentation enabled the maximum size of internally generated | |
267 | * packets such as translation table exchanges or tvlv containers, etc | |
268 | * has to be calculated | |
269 | */ | |
270 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
271 | min_mtu -= sizeof(struct batadv_frag_packet); | |
272 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
273 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
274 | ||
275 | /* with fragmentation enabled we can fragment external packets easily */ | |
276 | min_mtu = min_t(int, min_mtu, ETH_DATA_LEN); | |
277 | ||
c6c8fea2 | 278 | out: |
a19d3d85 | 279 | return min_mtu - batadv_max_header_len(); |
c6c8fea2 SE |
280 | } |
281 | ||
282 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 283 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 284 | { |
a19d3d85 | 285 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 286 | |
a19d3d85 ML |
287 | /* Check if the local translate table should be cleaned up to match a |
288 | * new (and smaller) MTU. | |
289 | */ | |
290 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
291 | } |
292 | ||
56303d34 SE |
293 | static void |
294 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 295 | { |
56303d34 SE |
296 | struct batadv_priv *bat_priv; |
297 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 298 | |
e9a4f295 | 299 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 300 | goto out; |
c6c8fea2 | 301 | |
e6c10f43 | 302 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 303 | |
c3229398 | 304 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 305 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 306 | |
9cfc7bd6 | 307 | /* the first active interface becomes our primary interface or |
015758d0 | 308 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 309 | */ |
e5d89254 | 310 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 311 | if (!primary_if) |
18a1cb6e | 312 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 313 | |
3e34819e SE |
314 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
315 | hard_iface->net_dev->name); | |
c6c8fea2 | 316 | |
9563877e | 317 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
318 | |
319 | out: | |
320 | if (primary_if) | |
e5d89254 | 321 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
322 | } |
323 | ||
56303d34 SE |
324 | static void |
325 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 326 | { |
e9a4f295 SE |
327 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
328 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
329 | return; |
330 | ||
e9a4f295 | 331 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 332 | |
3e34819e SE |
333 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
334 | hard_iface->net_dev->name); | |
c6c8fea2 | 335 | |
9563877e | 336 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
337 | } |
338 | ||
cb4b0d48 AQ |
339 | /** |
340 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
341 | * @slave: the interface enslaved in another master | |
342 | * @master: the master from which slave has to be removed | |
343 | * | |
344 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
345 | * is free'd and master can correctly change its internal state. | |
346 | * Return 0 on success, a negative value representing the error otherwise | |
347 | */ | |
348 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
349 | struct net_device *master) | |
350 | { | |
351 | int ret; | |
352 | ||
353 | if (!master) | |
354 | return 0; | |
355 | ||
356 | ret = -EBUSY; | |
357 | if (master->netdev_ops->ndo_del_slave) | |
358 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
359 | ||
360 | return ret; | |
361 | } | |
362 | ||
56303d34 | 363 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 364 | const char *iface_name) |
c6c8fea2 | 365 | { |
56303d34 | 366 | struct batadv_priv *bat_priv; |
cb4b0d48 | 367 | struct net_device *soft_iface, *master; |
293e9338 | 368 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 369 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 370 | int ret; |
c6c8fea2 | 371 | |
e9a4f295 | 372 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
373 | goto out; |
374 | ||
e6c10f43 | 375 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
376 | goto out; |
377 | ||
e44d8fe2 | 378 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 379 | |
e44d8fe2 | 380 | if (!soft_iface) { |
04b482a2 | 381 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 382 | |
e44d8fe2 SE |
383 | if (!soft_iface) { |
384 | ret = -ENOMEM; | |
c6c8fea2 | 385 | goto err; |
e44d8fe2 | 386 | } |
c6c8fea2 SE |
387 | |
388 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
389 | dev_hold(soft_iface); |
390 | } | |
391 | ||
04b482a2 | 392 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 393 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 394 | soft_iface->name); |
e44d8fe2 | 395 | ret = -EINVAL; |
77af7575 | 396 | goto err_dev; |
c6c8fea2 SE |
397 | } |
398 | ||
cb4b0d48 AQ |
399 | /* check if the interface is enslaved in another virtual one and |
400 | * in that case unlink it first | |
401 | */ | |
402 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
403 | ret = batadv_master_del_slave(hard_iface, master); | |
404 | if (ret) | |
405 | goto err_dev; | |
406 | ||
e44d8fe2 | 407 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 408 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 409 | |
3dbd550b SE |
410 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
411 | if (ret) | |
412 | goto err_dev; | |
413 | ||
77af7575 | 414 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 415 | if (ret < 0) |
3dbd550b | 416 | goto err_upper; |
c6c8fea2 | 417 | |
e6c10f43 | 418 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 419 | bat_priv->num_ifaces++; |
e9a4f295 | 420 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
421 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
422 | if (ret < 0) { | |
423 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
424 | bat_priv->num_ifaces--; | |
425 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 426 | goto err_upper; |
62446307 | 427 | } |
c6c8fea2 | 428 | |
7e071c79 | 429 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 430 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
431 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
432 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 433 | |
3e34819e SE |
434 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
435 | hard_iface->net_dev->name); | |
c6c8fea2 | 436 | |
0aca2369 | 437 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 438 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 439 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 440 | "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 %i would solve the problem.\n", |
3e34819e | 441 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 442 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 443 | |
0aca2369 | 444 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 445 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 446 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 447 | "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 %i.\n", |
3e34819e | 448 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 449 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 450 | |
18a1cb6e SE |
451 | if (batadv_hardif_is_iface_up(hard_iface)) |
452 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 453 | else |
3e34819e SE |
454 | batadv_err(hard_iface->soft_iface, |
455 | "Not using interface %s (retrying later): interface not active\n", | |
456 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
457 | |
458 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 459 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
460 | |
461 | out: | |
462 | return 0; | |
463 | ||
3dbd550b SE |
464 | err_upper: |
465 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 466 | err_dev: |
3dbd550b | 467 | hard_iface->soft_iface = NULL; |
77af7575 | 468 | dev_put(soft_iface); |
c6c8fea2 | 469 | err: |
e5d89254 | 470 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 471 | return ret; |
c6c8fea2 SE |
472 | } |
473 | ||
a15fd361 SE |
474 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
475 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 476 | { |
56303d34 SE |
477 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
478 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 479 | |
e9a4f295 | 480 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 481 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 482 | |
e9a4f295 | 483 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 484 | goto out; |
c6c8fea2 | 485 | |
3e34819e SE |
486 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
487 | hard_iface->net_dev->name); | |
e6c10f43 | 488 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
489 | |
490 | bat_priv->num_ifaces--; | |
7d211efc | 491 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 492 | |
e5d89254 | 493 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 494 | if (hard_iface == primary_if) { |
56303d34 | 495 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 496 | |
18a1cb6e SE |
497 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
498 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
499 | |
500 | if (new_if) | |
e5d89254 | 501 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
502 | } |
503 | ||
00a50076 | 504 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 505 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 506 | |
e6c10f43 | 507 | /* delete all references to this hard_iface */ |
7d211efc | 508 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 509 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 510 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
511 | |
512 | /* nobody uses this interface anymore */ | |
8257f55a AQ |
513 | if (!bat_priv->num_ifaces) { |
514 | batadv_gw_check_client_stop(bat_priv); | |
515 | ||
516 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
517 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
518 | } | |
c6c8fea2 | 519 | |
3dbd550b | 520 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
e6c10f43 | 521 | hard_iface->soft_iface = NULL; |
e5d89254 | 522 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
523 | |
524 | out: | |
525 | if (primary_if) | |
e5d89254 | 526 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
527 | } |
528 | ||
5bc44dc8 SW |
529 | /** |
530 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
531 | * @work: work queue item | |
532 | * | |
533 | * Free the parts of the hard interface which can not be removed under | |
534 | * rtnl lock (to prevent deadlock situations). | |
535 | */ | |
536 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
537 | { | |
538 | struct batadv_hard_iface *hard_iface; | |
539 | ||
540 | hard_iface = container_of(work, struct batadv_hard_iface, | |
541 | cleanup_work); | |
542 | ||
5bc7c1eb | 543 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 SW |
544 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
545 | batadv_hardif_free_ref(hard_iface); | |
546 | } | |
547 | ||
56303d34 | 548 | static struct batadv_hard_iface * |
18a1cb6e | 549 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 550 | { |
56303d34 | 551 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
552 | int ret; |
553 | ||
c3caf519 SE |
554 | ASSERT_RTNL(); |
555 | ||
18a1cb6e | 556 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
557 | if (ret != 1) |
558 | goto out; | |
559 | ||
560 | dev_hold(net_dev); | |
561 | ||
7db3fc29 | 562 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 563 | if (!hard_iface) |
c6c8fea2 | 564 | goto release_dev; |
c6c8fea2 | 565 | |
5853e22c | 566 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
567 | if (ret) |
568 | goto free_if; | |
569 | ||
e6c10f43 ML |
570 | hard_iface->if_num = -1; |
571 | hard_iface->net_dev = net_dev; | |
572 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 573 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
574 | |
575 | ret = batadv_debugfs_add_hardif(hard_iface); | |
576 | if (ret) | |
577 | goto free_sysfs; | |
578 | ||
e6c10f43 | 579 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
580 | INIT_WORK(&hard_iface->cleanup_work, |
581 | batadv_hardif_remove_interface_finish); | |
582 | ||
caf65bfc MS |
583 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
584 | if (batadv_is_wifi_netdev(net_dev)) | |
585 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
586 | ||
ed75ccbe | 587 | /* extra reference for return */ |
e6c10f43 | 588 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 589 | |
18a1cb6e | 590 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 591 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 592 | |
e6c10f43 | 593 | return hard_iface; |
c6c8fea2 | 594 | |
5bc7c1eb SW |
595 | free_sysfs: |
596 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 597 | free_if: |
e6c10f43 | 598 | kfree(hard_iface); |
c6c8fea2 SE |
599 | release_dev: |
600 | dev_put(net_dev); | |
601 | out: | |
602 | return NULL; | |
603 | } | |
604 | ||
56303d34 | 605 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 606 | { |
c3caf519 SE |
607 | ASSERT_RTNL(); |
608 | ||
c6c8fea2 | 609 | /* first deactivate interface */ |
e9a4f295 | 610 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
611 | batadv_hardif_disable_interface(hard_iface, |
612 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 613 | |
e9a4f295 | 614 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
615 | return; |
616 | ||
e9a4f295 | 617 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 618 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
619 | } |
620 | ||
9563877e | 621 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 622 | { |
56303d34 | 623 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 624 | |
c3caf519 | 625 | rtnl_lock(); |
e6c10f43 | 626 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 627 | &batadv_hardif_list, list) { |
e6c10f43 | 628 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 629 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
630 | } |
631 | rtnl_unlock(); | |
632 | } | |
633 | ||
18a1cb6e SE |
634 | static int batadv_hard_if_event(struct notifier_block *this, |
635 | unsigned long event, void *ptr) | |
c6c8fea2 | 636 | { |
351638e7 | 637 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
638 | struct batadv_hard_iface *hard_iface; |
639 | struct batadv_hard_iface *primary_if = NULL; | |
640 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 641 | |
37130293 SE |
642 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
643 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
644 | bat_priv = netdev_priv(net_dev); |
645 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
646 | return NOTIFY_DONE; |
647 | } | |
648 | ||
56303d34 | 649 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 650 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 651 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 652 | |
e6c10f43 | 653 | if (!hard_iface) |
c6c8fea2 SE |
654 | goto out; |
655 | ||
656 | switch (event) { | |
657 | case NETDEV_UP: | |
18a1cb6e | 658 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
659 | break; |
660 | case NETDEV_GOING_DOWN: | |
661 | case NETDEV_DOWN: | |
18a1cb6e | 662 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
663 | break; |
664 | case NETDEV_UNREGISTER: | |
e6c10f43 | 665 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 666 | |
18a1cb6e | 667 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
668 | break; |
669 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 670 | if (hard_iface->soft_iface) |
9563877e | 671 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
672 | break; |
673 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 674 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
675 | goto hardif_put; |
676 | ||
18a1cb6e | 677 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 678 | |
e6c10f43 | 679 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 680 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 681 | |
e5d89254 | 682 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
683 | if (!primary_if) |
684 | goto hardif_put; | |
685 | ||
686 | if (hard_iface == primary_if) | |
18a1cb6e | 687 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
688 | break; |
689 | default: | |
690 | break; | |
f81c6224 | 691 | } |
c6c8fea2 SE |
692 | |
693 | hardif_put: | |
e5d89254 | 694 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 695 | out: |
32ae9b22 | 696 | if (primary_if) |
e5d89254 | 697 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
698 | return NOTIFY_DONE; |
699 | } | |
700 | ||
9563877e | 701 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 702 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 703 | }; |