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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" |
8257f55a | 31 | #include "gateway_client.h" |
c6c8fea2 SE |
32 | |
33 | #include <linux/if_arp.h> | |
af5d4f77 | 34 | #include <linux/if_ether.h> |
c6c8fea2 | 35 | |
9563877e | 36 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 37 | { |
56303d34 | 38 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 39 | |
56303d34 | 40 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
41 | dev_put(hard_iface->net_dev); |
42 | kfree(hard_iface); | |
c6c8fea2 SE |
43 | } |
44 | ||
56303d34 SE |
45 | struct batadv_hard_iface * |
46 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 47 | { |
56303d34 | 48 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
49 | |
50 | rcu_read_lock(); | |
3193e8fd | 51 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
52 | if (hard_iface->net_dev == net_dev && |
53 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
54 | goto out; |
55 | } | |
56 | ||
e6c10f43 | 57 | hard_iface = NULL; |
c6c8fea2 SE |
58 | |
59 | out: | |
c6c8fea2 | 60 | rcu_read_unlock(); |
e6c10f43 | 61 | return hard_iface; |
c6c8fea2 SE |
62 | } |
63 | ||
b7eddd0b AQ |
64 | /** |
65 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
66 | * @net_dev: the device to check | |
67 | * | |
68 | * If the user creates any virtual device on top of a batman-adv interface, it | |
69 | * is important to prevent this new interface to be used to create a new mesh | |
70 | * network (this behaviour would lead to a batman-over-batman configuration). | |
71 | * This function recursively checks all the fathers of the device passed as | |
72 | * argument looking for a batman-adv soft interface. | |
73 | * | |
74 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
75 | * if it is a batman-adv interface itself), false otherwise | |
76 | */ | |
77 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
78 | { | |
79 | struct net_device *parent_dev; | |
80 | bool ret; | |
81 | ||
82 | /* check if this is a batman-adv mesh interface */ | |
83 | if (batadv_softif_is_valid(net_dev)) | |
84 | return true; | |
85 | ||
86 | /* no more parents..stop recursion */ | |
87 | if (net_dev->iflink == net_dev->ifindex) | |
88 | return false; | |
89 | ||
90 | /* recurse over the parent device */ | |
91 | parent_dev = dev_get_by_index(&init_net, net_dev->iflink); | |
92 | /* if we got a NULL parent_dev there is something broken.. */ | |
93 | if (WARN(!parent_dev, "Cannot find parent device")) | |
94 | return false; | |
95 | ||
96 | ret = batadv_is_on_batman_iface(parent_dev); | |
97 | ||
98 | if (parent_dev) | |
99 | dev_put(parent_dev); | |
100 | return ret; | |
101 | } | |
102 | ||
18a1cb6e | 103 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
104 | { |
105 | if (net_dev->flags & IFF_LOOPBACK) | |
106 | return 0; | |
107 | ||
108 | if (net_dev->type != ARPHRD_ETHER) | |
109 | return 0; | |
110 | ||
111 | if (net_dev->addr_len != ETH_ALEN) | |
112 | return 0; | |
113 | ||
114 | /* no batman over batman */ | |
b7eddd0b | 115 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 116 | return 0; |
c6c8fea2 | 117 | |
c6c8fea2 SE |
118 | return 1; |
119 | } | |
120 | ||
de68d100 MS |
121 | /** |
122 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
123 | * interface | |
124 | * @net_device: the device to check | |
125 | * | |
126 | * Returns true if the net device is a 802.11 wireless device, false otherwise. | |
127 | */ | |
0c69aecc | 128 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 129 | { |
0c69aecc AQ |
130 | if (!net_device) |
131 | return false; | |
132 | ||
de68d100 MS |
133 | #ifdef CONFIG_WIRELESS_EXT |
134 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
135 | * check for wireless_handlers != NULL | |
136 | */ | |
137 | if (net_device->wireless_handlers) | |
138 | return true; | |
139 | #endif | |
140 | ||
141 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
142 | if (net_device->ieee80211_ptr) | |
143 | return true; | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
56303d34 | 148 | static struct batadv_hard_iface * |
18a1cb6e | 149 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 150 | { |
56303d34 | 151 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
152 | |
153 | rcu_read_lock(); | |
3193e8fd | 154 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 155 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
156 | continue; |
157 | ||
e9a4f295 | 158 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 159 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
160 | goto out; |
161 | } | |
162 | ||
e6c10f43 | 163 | hard_iface = NULL; |
c6c8fea2 SE |
164 | |
165 | out: | |
c6c8fea2 | 166 | rcu_read_unlock(); |
e6c10f43 | 167 | return hard_iface; |
c6c8fea2 SE |
168 | } |
169 | ||
56303d34 SE |
170 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
171 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 172 | { |
56303d34 | 173 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 174 | |
e5d89254 | 175 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
176 | if (!primary_if) |
177 | goto out; | |
c6c8fea2 | 178 | |
785ea114 | 179 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 180 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
181 | out: |
182 | if (primary_if) | |
e5d89254 | 183 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
184 | } |
185 | ||
56303d34 SE |
186 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
187 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 188 | { |
56303d34 | 189 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 190 | |
c3caf519 | 191 | ASSERT_RTNL(); |
c6c8fea2 | 192 | |
32ae9b22 ML |
193 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
194 | new_hard_iface = NULL; | |
c6c8fea2 | 195 | |
728cbc6a | 196 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 197 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 198 | |
32ae9b22 | 199 | if (!new_hard_iface) |
23721387 | 200 | goto out; |
32ae9b22 | 201 | |
cd8b78e7 | 202 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 203 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
204 | |
205 | out: | |
206 | if (curr_hard_iface) | |
e5d89254 | 207 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
208 | } |
209 | ||
56303d34 SE |
210 | static bool |
211 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 212 | { |
e6c10f43 | 213 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
214 | return true; |
215 | ||
216 | return false; | |
217 | } | |
218 | ||
18a1cb6e | 219 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 220 | { |
56303d34 | 221 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
222 | |
223 | rcu_read_lock(); | |
3193e8fd | 224 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
225 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
226 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
227 | continue; |
228 | ||
e6c10f43 | 229 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
230 | continue; |
231 | ||
1eda58bf SE |
232 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
233 | net_dev->dev_addr)) | |
c6c8fea2 SE |
234 | continue; |
235 | ||
67969581 SE |
236 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
237 | net_dev->dev_addr, hard_iface->net_dev->name); | |
238 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
239 | } |
240 | rcu_read_unlock(); | |
241 | } | |
242 | ||
9563877e | 243 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 244 | { |
a19d3d85 | 245 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 246 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 247 | int min_mtu = ETH_DATA_LEN; |
c6c8fea2 SE |
248 | |
249 | rcu_read_lock(); | |
3193e8fd | 250 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
251 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
252 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
253 | continue; |
254 | ||
e6c10f43 | 255 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
256 | continue; |
257 | ||
a19d3d85 | 258 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
259 | } |
260 | rcu_read_unlock(); | |
a19d3d85 ML |
261 | |
262 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
263 | ||
264 | if (atomic_read(&bat_priv->fragmentation) == 0) | |
265 | goto out; | |
266 | ||
267 | /* with fragmentation enabled the maximum size of internally generated | |
268 | * packets such as translation table exchanges or tvlv containers, etc | |
269 | * has to be calculated | |
270 | */ | |
271 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
272 | min_mtu -= sizeof(struct batadv_frag_packet); | |
273 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
274 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
275 | ||
276 | /* with fragmentation enabled we can fragment external packets easily */ | |
277 | min_mtu = min_t(int, min_mtu, ETH_DATA_LEN); | |
278 | ||
c6c8fea2 | 279 | out: |
a19d3d85 | 280 | return min_mtu - batadv_max_header_len(); |
c6c8fea2 SE |
281 | } |
282 | ||
283 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 284 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 285 | { |
a19d3d85 | 286 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 287 | |
a19d3d85 ML |
288 | /* Check if the local translate table should be cleaned up to match a |
289 | * new (and smaller) MTU. | |
290 | */ | |
291 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
292 | } |
293 | ||
56303d34 SE |
294 | static void |
295 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 296 | { |
56303d34 SE |
297 | struct batadv_priv *bat_priv; |
298 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 299 | |
e9a4f295 | 300 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 301 | goto out; |
c6c8fea2 | 302 | |
e6c10f43 | 303 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 304 | |
c3229398 | 305 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 306 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 307 | |
9cfc7bd6 | 308 | /* the first active interface becomes our primary interface or |
015758d0 | 309 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 310 | */ |
e5d89254 | 311 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 312 | if (!primary_if) |
18a1cb6e | 313 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 314 | |
3e34819e SE |
315 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
316 | hard_iface->net_dev->name); | |
c6c8fea2 | 317 | |
9563877e | 318 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
319 | |
320 | out: | |
321 | if (primary_if) | |
e5d89254 | 322 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
323 | } |
324 | ||
56303d34 SE |
325 | static void |
326 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 327 | { |
e9a4f295 SE |
328 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
329 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
330 | return; |
331 | ||
e9a4f295 | 332 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 333 | |
3e34819e SE |
334 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
335 | hard_iface->net_dev->name); | |
c6c8fea2 | 336 | |
9563877e | 337 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
338 | } |
339 | ||
cb4b0d48 AQ |
340 | /** |
341 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
342 | * @slave: the interface enslaved in another master | |
343 | * @master: the master from which slave has to be removed | |
344 | * | |
345 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
346 | * is free'd and master can correctly change its internal state. | |
347 | * Return 0 on success, a negative value representing the error otherwise | |
348 | */ | |
349 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
350 | struct net_device *master) | |
351 | { | |
352 | int ret; | |
353 | ||
354 | if (!master) | |
355 | return 0; | |
356 | ||
357 | ret = -EBUSY; | |
358 | if (master->netdev_ops->ndo_del_slave) | |
359 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
56303d34 | 364 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 365 | const char *iface_name) |
c6c8fea2 | 366 | { |
56303d34 | 367 | struct batadv_priv *bat_priv; |
cb4b0d48 | 368 | struct net_device *soft_iface, *master; |
293e9338 | 369 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 370 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 371 | int ret; |
c6c8fea2 | 372 | |
e9a4f295 | 373 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
374 | goto out; |
375 | ||
e6c10f43 | 376 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
377 | goto out; |
378 | ||
e44d8fe2 | 379 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 380 | |
e44d8fe2 | 381 | if (!soft_iface) { |
04b482a2 | 382 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 383 | |
e44d8fe2 SE |
384 | if (!soft_iface) { |
385 | ret = -ENOMEM; | |
c6c8fea2 | 386 | goto err; |
e44d8fe2 | 387 | } |
c6c8fea2 SE |
388 | |
389 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
390 | dev_hold(soft_iface); |
391 | } | |
392 | ||
04b482a2 | 393 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 394 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 395 | soft_iface->name); |
e44d8fe2 | 396 | ret = -EINVAL; |
77af7575 | 397 | goto err_dev; |
c6c8fea2 SE |
398 | } |
399 | ||
cb4b0d48 AQ |
400 | /* check if the interface is enslaved in another virtual one and |
401 | * in that case unlink it first | |
402 | */ | |
403 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
404 | ret = batadv_master_del_slave(hard_iface, master); | |
405 | if (ret) | |
406 | goto err_dev; | |
407 | ||
e44d8fe2 | 408 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 409 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 410 | |
3dbd550b SE |
411 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
412 | if (ret) | |
413 | goto err_dev; | |
414 | ||
77af7575 | 415 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 416 | if (ret < 0) |
3dbd550b | 417 | goto err_upper; |
c6c8fea2 | 418 | |
e6c10f43 | 419 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 420 | bat_priv->num_ifaces++; |
e9a4f295 | 421 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
422 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
423 | if (ret < 0) { | |
424 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
425 | bat_priv->num_ifaces--; | |
426 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 427 | goto err_upper; |
62446307 | 428 | } |
c6c8fea2 | 429 | |
7e071c79 | 430 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 431 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
432 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
433 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 434 | |
3e34819e SE |
435 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
436 | hard_iface->net_dev->name); | |
c6c8fea2 | 437 | |
0aca2369 | 438 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 439 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 440 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 441 | "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 | 442 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 443 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 444 | |
0aca2369 | 445 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 446 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 447 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 448 | "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 | 449 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 450 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 451 | |
18a1cb6e SE |
452 | if (batadv_hardif_is_iface_up(hard_iface)) |
453 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 454 | else |
3e34819e SE |
455 | batadv_err(hard_iface->soft_iface, |
456 | "Not using interface %s (retrying later): interface not active\n", | |
457 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
458 | |
459 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 460 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
461 | |
462 | out: | |
463 | return 0; | |
464 | ||
3dbd550b SE |
465 | err_upper: |
466 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 467 | err_dev: |
3dbd550b | 468 | hard_iface->soft_iface = NULL; |
77af7575 | 469 | dev_put(soft_iface); |
c6c8fea2 | 470 | err: |
e5d89254 | 471 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 472 | return ret; |
c6c8fea2 SE |
473 | } |
474 | ||
a15fd361 SE |
475 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
476 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 477 | { |
56303d34 SE |
478 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
479 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 480 | |
e9a4f295 | 481 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 482 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 483 | |
e9a4f295 | 484 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 485 | goto out; |
c6c8fea2 | 486 | |
3e34819e SE |
487 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
488 | hard_iface->net_dev->name); | |
e6c10f43 | 489 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
490 | |
491 | bat_priv->num_ifaces--; | |
7d211efc | 492 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 493 | |
e5d89254 | 494 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 495 | if (hard_iface == primary_if) { |
56303d34 | 496 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 497 | |
18a1cb6e SE |
498 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
499 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
500 | |
501 | if (new_if) | |
e5d89254 | 502 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
503 | } |
504 | ||
00a50076 | 505 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 506 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 507 | |
e6c10f43 | 508 | /* delete all references to this hard_iface */ |
7d211efc | 509 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 510 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 511 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
512 | |
513 | /* nobody uses this interface anymore */ | |
8257f55a AQ |
514 | if (!bat_priv->num_ifaces) { |
515 | batadv_gw_check_client_stop(bat_priv); | |
516 | ||
517 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
518 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
519 | } | |
c6c8fea2 | 520 | |
3dbd550b | 521 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
e6c10f43 | 522 | hard_iface->soft_iface = NULL; |
e5d89254 | 523 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
524 | |
525 | out: | |
526 | if (primary_if) | |
e5d89254 | 527 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
528 | } |
529 | ||
5bc44dc8 SW |
530 | /** |
531 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
532 | * @work: work queue item | |
533 | * | |
534 | * Free the parts of the hard interface which can not be removed under | |
535 | * rtnl lock (to prevent deadlock situations). | |
536 | */ | |
537 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
538 | { | |
539 | struct batadv_hard_iface *hard_iface; | |
540 | ||
541 | hard_iface = container_of(work, struct batadv_hard_iface, | |
542 | cleanup_work); | |
543 | ||
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; |
e6c10f43 | 574 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
575 | INIT_WORK(&hard_iface->cleanup_work, |
576 | batadv_hardif_remove_interface_finish); | |
577 | ||
caf65bfc MS |
578 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
579 | if (batadv_is_wifi_netdev(net_dev)) | |
580 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
581 | ||
ed75ccbe | 582 | /* extra reference for return */ |
e6c10f43 | 583 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 584 | |
18a1cb6e | 585 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 586 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 587 | |
e6c10f43 | 588 | return hard_iface; |
c6c8fea2 SE |
589 | |
590 | free_if: | |
e6c10f43 | 591 | kfree(hard_iface); |
c6c8fea2 SE |
592 | release_dev: |
593 | dev_put(net_dev); | |
594 | out: | |
595 | return NULL; | |
596 | } | |
597 | ||
56303d34 | 598 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 599 | { |
c3caf519 SE |
600 | ASSERT_RTNL(); |
601 | ||
c6c8fea2 | 602 | /* first deactivate interface */ |
e9a4f295 | 603 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
604 | batadv_hardif_disable_interface(hard_iface, |
605 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 606 | |
e9a4f295 | 607 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
608 | return; |
609 | ||
e9a4f295 | 610 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 611 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
612 | } |
613 | ||
9563877e | 614 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 615 | { |
56303d34 | 616 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 617 | |
c3caf519 | 618 | rtnl_lock(); |
e6c10f43 | 619 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 620 | &batadv_hardif_list, list) { |
e6c10f43 | 621 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 622 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
623 | } |
624 | rtnl_unlock(); | |
625 | } | |
626 | ||
18a1cb6e SE |
627 | static int batadv_hard_if_event(struct notifier_block *this, |
628 | unsigned long event, void *ptr) | |
c6c8fea2 | 629 | { |
351638e7 | 630 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
631 | struct batadv_hard_iface *hard_iface; |
632 | struct batadv_hard_iface *primary_if = NULL; | |
633 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 634 | |
37130293 SE |
635 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
636 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
637 | bat_priv = netdev_priv(net_dev); |
638 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
639 | return NOTIFY_DONE; |
640 | } | |
641 | ||
56303d34 | 642 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 643 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 644 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 645 | |
e6c10f43 | 646 | if (!hard_iface) |
c6c8fea2 SE |
647 | goto out; |
648 | ||
649 | switch (event) { | |
650 | case NETDEV_UP: | |
18a1cb6e | 651 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
652 | break; |
653 | case NETDEV_GOING_DOWN: | |
654 | case NETDEV_DOWN: | |
18a1cb6e | 655 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
656 | break; |
657 | case NETDEV_UNREGISTER: | |
e6c10f43 | 658 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 659 | |
18a1cb6e | 660 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
661 | break; |
662 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 663 | if (hard_iface->soft_iface) |
9563877e | 664 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
665 | break; |
666 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 667 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
668 | goto hardif_put; |
669 | ||
18a1cb6e | 670 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 671 | |
e6c10f43 | 672 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 673 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 674 | |
e5d89254 | 675 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
676 | if (!primary_if) |
677 | goto hardif_put; | |
678 | ||
679 | if (hard_iface == primary_if) | |
18a1cb6e | 680 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
681 | break; |
682 | default: | |
683 | break; | |
f81c6224 | 684 | } |
c6c8fea2 SE |
685 | |
686 | hardif_put: | |
e5d89254 | 687 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 688 | out: |
32ae9b22 | 689 | if (primary_if) |
e5d89254 | 690 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
691 | return NOTIFY_DONE; |
692 | } | |
693 | ||
9563877e | 694 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 695 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 696 | }; |