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9f6446c7 | 1 | /* Copyright (C) 2007-2015 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 | ||
c6c8fea2 | 18 | #include "hard-interface.h" |
1e2c2a4f | 19 | #include "main.h" |
c6c8fea2 | 20 | |
1e2c2a4f SE |
21 | #include <linux/bug.h> |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/fs.h> | |
c6c8fea2 | 25 | #include <linux/if_arp.h> |
af5d4f77 | 26 | #include <linux/if_ether.h> |
1e2c2a4f SE |
27 | #include <linux/if.h> |
28 | #include <linux/kernel.h> | |
29 | #include <linux/list.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/printk.h> | |
32 | #include <linux/rculist.h> | |
33 | #include <linux/rtnetlink.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/workqueue.h> | |
36 | #include <net/net_namespace.h> | |
37 | ||
38 | #include "bridge_loop_avoidance.h" | |
39 | #include "debugfs.h" | |
40 | #include "distributed-arp-table.h" | |
41 | #include "gateway_client.h" | |
42 | #include "originator.h" | |
43 | #include "packet.h" | |
44 | #include "send.h" | |
45 | #include "soft-interface.h" | |
46 | #include "sysfs.h" | |
47 | #include "translation-table.h" | |
c6c8fea2 | 48 | |
9563877e | 49 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 50 | { |
56303d34 | 51 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 52 | |
56303d34 | 53 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
54 | dev_put(hard_iface->net_dev); |
55 | kfree(hard_iface); | |
c6c8fea2 SE |
56 | } |
57 | ||
56303d34 SE |
58 | struct batadv_hard_iface * |
59 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 60 | { |
56303d34 | 61 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
62 | |
63 | rcu_read_lock(); | |
3193e8fd | 64 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
65 | if (hard_iface->net_dev == net_dev && |
66 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
67 | goto out; |
68 | } | |
69 | ||
e6c10f43 | 70 | hard_iface = NULL; |
c6c8fea2 SE |
71 | |
72 | out: | |
c6c8fea2 | 73 | rcu_read_unlock(); |
e6c10f43 | 74 | return hard_iface; |
c6c8fea2 SE |
75 | } |
76 | ||
b7eddd0b AQ |
77 | /** |
78 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
79 | * @net_dev: the device to check | |
80 | * | |
81 | * If the user creates any virtual device on top of a batman-adv interface, it | |
82 | * is important to prevent this new interface to be used to create a new mesh | |
83 | * network (this behaviour would lead to a batman-over-batman configuration). | |
84 | * This function recursively checks all the fathers of the device passed as | |
85 | * argument looking for a batman-adv soft interface. | |
86 | * | |
87 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
88 | * if it is a batman-adv interface itself), false otherwise | |
89 | */ | |
90 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
91 | { | |
92 | struct net_device *parent_dev; | |
93 | bool ret; | |
94 | ||
95 | /* check if this is a batman-adv mesh interface */ | |
96 | if (batadv_softif_is_valid(net_dev)) | |
97 | return true; | |
98 | ||
99 | /* no more parents..stop recursion */ | |
a54acb3a ND |
100 | if (dev_get_iflink(net_dev) == 0 || |
101 | dev_get_iflink(net_dev) == net_dev->ifindex) | |
b7eddd0b AQ |
102 | return false; |
103 | ||
104 | /* recurse over the parent device */ | |
a54acb3a | 105 | parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev)); |
b7eddd0b AQ |
106 | /* if we got a NULL parent_dev there is something broken.. */ |
107 | if (WARN(!parent_dev, "Cannot find parent device")) | |
108 | return false; | |
109 | ||
110 | ret = batadv_is_on_batman_iface(parent_dev); | |
111 | ||
b7eddd0b AQ |
112 | return ret; |
113 | } | |
114 | ||
18a1cb6e | 115 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
116 | { |
117 | if (net_dev->flags & IFF_LOOPBACK) | |
118 | return 0; | |
119 | ||
120 | if (net_dev->type != ARPHRD_ETHER) | |
121 | return 0; | |
122 | ||
123 | if (net_dev->addr_len != ETH_ALEN) | |
124 | return 0; | |
125 | ||
126 | /* no batman over batman */ | |
b7eddd0b | 127 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 128 | return 0; |
c6c8fea2 | 129 | |
c6c8fea2 SE |
130 | return 1; |
131 | } | |
132 | ||
de68d100 MS |
133 | /** |
134 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
135 | * interface | |
136 | * @net_device: the device to check | |
137 | * | |
138 | * Returns true if the net device is a 802.11 wireless device, false otherwise. | |
139 | */ | |
0c69aecc | 140 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 141 | { |
0c69aecc AQ |
142 | if (!net_device) |
143 | return false; | |
144 | ||
de68d100 MS |
145 | #ifdef CONFIG_WIRELESS_EXT |
146 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
147 | * check for wireless_handlers != NULL | |
148 | */ | |
149 | if (net_device->wireless_handlers) | |
150 | return true; | |
151 | #endif | |
152 | ||
153 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
154 | if (net_device->ieee80211_ptr) | |
155 | return true; | |
156 | ||
157 | return false; | |
158 | } | |
159 | ||
56303d34 | 160 | static struct batadv_hard_iface * |
18a1cb6e | 161 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 162 | { |
56303d34 | 163 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
164 | |
165 | rcu_read_lock(); | |
3193e8fd | 166 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 167 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
168 | continue; |
169 | ||
e9a4f295 | 170 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 171 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
172 | goto out; |
173 | } | |
174 | ||
e6c10f43 | 175 | hard_iface = NULL; |
c6c8fea2 SE |
176 | |
177 | out: | |
c6c8fea2 | 178 | rcu_read_unlock(); |
e6c10f43 | 179 | return hard_iface; |
c6c8fea2 SE |
180 | } |
181 | ||
56303d34 SE |
182 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
183 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 184 | { |
56303d34 | 185 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 186 | |
e5d89254 | 187 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
188 | if (!primary_if) |
189 | goto out; | |
c6c8fea2 | 190 | |
785ea114 | 191 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 192 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
193 | out: |
194 | if (primary_if) | |
e5d89254 | 195 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
196 | } |
197 | ||
56303d34 SE |
198 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
199 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 200 | { |
56303d34 | 201 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 202 | |
c3caf519 | 203 | ASSERT_RTNL(); |
c6c8fea2 | 204 | |
32ae9b22 ML |
205 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
206 | new_hard_iface = NULL; | |
c6c8fea2 | 207 | |
728cbc6a | 208 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 209 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 210 | |
32ae9b22 | 211 | if (!new_hard_iface) |
23721387 | 212 | goto out; |
32ae9b22 | 213 | |
cd8b78e7 | 214 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 215 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
216 | |
217 | out: | |
218 | if (curr_hard_iface) | |
e5d89254 | 219 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
220 | } |
221 | ||
56303d34 SE |
222 | static bool |
223 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 224 | { |
e6c10f43 | 225 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
226 | return true; |
227 | ||
228 | return false; | |
229 | } | |
230 | ||
18a1cb6e | 231 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 232 | { |
56303d34 | 233 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
234 | |
235 | rcu_read_lock(); | |
3193e8fd | 236 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
237 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
238 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
239 | continue; |
240 | ||
e6c10f43 | 241 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
242 | continue; |
243 | ||
1eda58bf SE |
244 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
245 | net_dev->dev_addr)) | |
c6c8fea2 SE |
246 | continue; |
247 | ||
67969581 SE |
248 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
249 | net_dev->dev_addr, hard_iface->net_dev->name); | |
250 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
251 | } |
252 | rcu_read_unlock(); | |
253 | } | |
254 | ||
9563877e | 255 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 256 | { |
a19d3d85 | 257 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 258 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 259 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
260 | |
261 | rcu_read_lock(); | |
3193e8fd | 262 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
263 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
264 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
265 | continue; |
266 | ||
e6c10f43 | 267 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
268 | continue; |
269 | ||
a19d3d85 | 270 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
271 | } |
272 | rcu_read_unlock(); | |
a19d3d85 | 273 | |
a19d3d85 ML |
274 | if (atomic_read(&bat_priv->fragmentation) == 0) |
275 | goto out; | |
276 | ||
277 | /* with fragmentation enabled the maximum size of internally generated | |
278 | * packets such as translation table exchanges or tvlv containers, etc | |
279 | * has to be calculated | |
280 | */ | |
281 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
282 | min_mtu -= sizeof(struct batadv_frag_packet); | |
283 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 284 | |
c6c8fea2 | 285 | out: |
930cd6e4 AQ |
286 | /* report to the other components the maximum amount of bytes that |
287 | * batman-adv can send over the wire (without considering the payload | |
288 | * overhead). For example, this value is used by TT to compute the | |
289 | * maximum local table table size | |
290 | */ | |
291 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
292 | ||
293 | /* the real soft-interface MTU is computed by removing the payload | |
294 | * overhead from the maximum amount of bytes that was just computed. | |
295 | * | |
296 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
297 | */ | |
298 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
299 | } |
300 | ||
301 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 302 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 303 | { |
a19d3d85 | 304 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 305 | |
a19d3d85 ML |
306 | /* Check if the local translate table should be cleaned up to match a |
307 | * new (and smaller) MTU. | |
308 | */ | |
309 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
310 | } |
311 | ||
56303d34 SE |
312 | static void |
313 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 314 | { |
56303d34 SE |
315 | struct batadv_priv *bat_priv; |
316 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 317 | |
e9a4f295 | 318 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 319 | goto out; |
c6c8fea2 | 320 | |
e6c10f43 | 321 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 322 | |
c3229398 | 323 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 324 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 325 | |
9cfc7bd6 | 326 | /* the first active interface becomes our primary interface or |
015758d0 | 327 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 328 | */ |
e5d89254 | 329 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 330 | if (!primary_if) |
18a1cb6e | 331 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 332 | |
3e34819e SE |
333 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
334 | hard_iface->net_dev->name); | |
c6c8fea2 | 335 | |
9563877e | 336 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
337 | |
338 | out: | |
339 | if (primary_if) | |
e5d89254 | 340 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
341 | } |
342 | ||
56303d34 SE |
343 | static void |
344 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 345 | { |
e9a4f295 SE |
346 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
347 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
348 | return; |
349 | ||
e9a4f295 | 350 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 351 | |
3e34819e SE |
352 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
353 | hard_iface->net_dev->name); | |
c6c8fea2 | 354 | |
9563877e | 355 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
356 | } |
357 | ||
cb4b0d48 AQ |
358 | /** |
359 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
360 | * @slave: the interface enslaved in another master | |
361 | * @master: the master from which slave has to be removed | |
362 | * | |
363 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
364 | * is free'd and master can correctly change its internal state. | |
365 | * Return 0 on success, a negative value representing the error otherwise | |
366 | */ | |
367 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
368 | struct net_device *master) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | if (!master) | |
373 | return 0; | |
374 | ||
375 | ret = -EBUSY; | |
376 | if (master->netdev_ops->ndo_del_slave) | |
377 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
378 | ||
379 | return ret; | |
380 | } | |
381 | ||
56303d34 | 382 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 383 | const char *iface_name) |
c6c8fea2 | 384 | { |
56303d34 | 385 | struct batadv_priv *bat_priv; |
cb4b0d48 | 386 | struct net_device *soft_iface, *master; |
293e9338 | 387 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 388 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 389 | int ret; |
c6c8fea2 | 390 | |
e9a4f295 | 391 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
392 | goto out; |
393 | ||
e6c10f43 | 394 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
395 | goto out; |
396 | ||
e44d8fe2 | 397 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 398 | |
e44d8fe2 | 399 | if (!soft_iface) { |
04b482a2 | 400 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 401 | |
e44d8fe2 SE |
402 | if (!soft_iface) { |
403 | ret = -ENOMEM; | |
c6c8fea2 | 404 | goto err; |
e44d8fe2 | 405 | } |
c6c8fea2 SE |
406 | |
407 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
408 | dev_hold(soft_iface); |
409 | } | |
410 | ||
04b482a2 | 411 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 412 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 413 | soft_iface->name); |
e44d8fe2 | 414 | ret = -EINVAL; |
77af7575 | 415 | goto err_dev; |
c6c8fea2 SE |
416 | } |
417 | ||
cb4b0d48 AQ |
418 | /* check if the interface is enslaved in another virtual one and |
419 | * in that case unlink it first | |
420 | */ | |
421 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
422 | ret = batadv_master_del_slave(hard_iface, master); | |
423 | if (ret) | |
424 | goto err_dev; | |
425 | ||
e44d8fe2 | 426 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 427 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 428 | |
3dbd550b SE |
429 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
430 | if (ret) | |
431 | goto err_dev; | |
432 | ||
77af7575 | 433 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 434 | if (ret < 0) |
3dbd550b | 435 | goto err_upper; |
c6c8fea2 | 436 | |
e6c10f43 | 437 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 438 | bat_priv->num_ifaces++; |
e9a4f295 | 439 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
440 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
441 | if (ret < 0) { | |
442 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
443 | bat_priv->num_ifaces--; | |
444 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 445 | goto err_upper; |
62446307 | 446 | } |
c6c8fea2 | 447 | |
7e071c79 | 448 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 449 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
450 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
451 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 452 | |
3e34819e SE |
453 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
454 | hard_iface->net_dev->name); | |
c6c8fea2 | 455 | |
0aca2369 | 456 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 457 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 458 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 459 | "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 | 460 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 461 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 462 | |
0aca2369 | 463 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 464 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 465 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 466 | "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 | 467 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 468 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 469 | |
18a1cb6e SE |
470 | if (batadv_hardif_is_iface_up(hard_iface)) |
471 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 472 | else |
3e34819e SE |
473 | batadv_err(hard_iface->soft_iface, |
474 | "Not using interface %s (retrying later): interface not active\n", | |
475 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
476 | |
477 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 478 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
479 | |
480 | out: | |
481 | return 0; | |
482 | ||
3dbd550b SE |
483 | err_upper: |
484 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 485 | err_dev: |
3dbd550b | 486 | hard_iface->soft_iface = NULL; |
77af7575 | 487 | dev_put(soft_iface); |
c6c8fea2 | 488 | err: |
e5d89254 | 489 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 490 | return ret; |
c6c8fea2 SE |
491 | } |
492 | ||
a15fd361 SE |
493 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
494 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 495 | { |
56303d34 SE |
496 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
497 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 498 | |
e9a4f295 | 499 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 500 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 501 | |
e9a4f295 | 502 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 503 | goto out; |
c6c8fea2 | 504 | |
3e34819e SE |
505 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
506 | hard_iface->net_dev->name); | |
e6c10f43 | 507 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
508 | |
509 | bat_priv->num_ifaces--; | |
7d211efc | 510 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 511 | |
e5d89254 | 512 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 513 | if (hard_iface == primary_if) { |
56303d34 | 514 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 515 | |
18a1cb6e SE |
516 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
517 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
518 | |
519 | if (new_if) | |
e5d89254 | 520 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
521 | } |
522 | ||
00a50076 | 523 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 524 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 525 | |
e6c10f43 | 526 | /* delete all references to this hard_iface */ |
7d211efc | 527 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 528 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 529 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 530 | |
a5256f7e AQ |
531 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
532 | ||
c6c8fea2 | 533 | /* nobody uses this interface anymore */ |
8257f55a AQ |
534 | if (!bat_priv->num_ifaces) { |
535 | batadv_gw_check_client_stop(bat_priv); | |
536 | ||
537 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
538 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
539 | } | |
c6c8fea2 | 540 | |
e6c10f43 | 541 | hard_iface->soft_iface = NULL; |
e5d89254 | 542 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
543 | |
544 | out: | |
545 | if (primary_if) | |
e5d89254 | 546 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
547 | } |
548 | ||
5bc44dc8 SW |
549 | /** |
550 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
551 | * @work: work queue item | |
552 | * | |
553 | * Free the parts of the hard interface which can not be removed under | |
554 | * rtnl lock (to prevent deadlock situations). | |
555 | */ | |
556 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
557 | { | |
558 | struct batadv_hard_iface *hard_iface; | |
559 | ||
560 | hard_iface = container_of(work, struct batadv_hard_iface, | |
561 | cleanup_work); | |
562 | ||
5bc7c1eb | 563 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 SW |
564 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
565 | batadv_hardif_free_ref(hard_iface); | |
566 | } | |
567 | ||
56303d34 | 568 | static struct batadv_hard_iface * |
18a1cb6e | 569 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 570 | { |
56303d34 | 571 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
572 | int ret; |
573 | ||
c3caf519 SE |
574 | ASSERT_RTNL(); |
575 | ||
18a1cb6e | 576 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
577 | if (ret != 1) |
578 | goto out; | |
579 | ||
580 | dev_hold(net_dev); | |
581 | ||
7db3fc29 | 582 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 583 | if (!hard_iface) |
c6c8fea2 | 584 | goto release_dev; |
c6c8fea2 | 585 | |
5853e22c | 586 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
587 | if (ret) |
588 | goto free_if; | |
589 | ||
e6c10f43 ML |
590 | hard_iface->if_num = -1; |
591 | hard_iface->net_dev = net_dev; | |
592 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 593 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
594 | |
595 | ret = batadv_debugfs_add_hardif(hard_iface); | |
596 | if (ret) | |
597 | goto free_sysfs; | |
598 | ||
e6c10f43 | 599 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
600 | INIT_WORK(&hard_iface->cleanup_work, |
601 | batadv_hardif_remove_interface_finish); | |
602 | ||
caf65bfc MS |
603 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
604 | if (batadv_is_wifi_netdev(net_dev)) | |
605 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
606 | ||
ed75ccbe | 607 | /* extra reference for return */ |
e6c10f43 | 608 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 609 | |
18a1cb6e | 610 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 611 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 612 | |
e6c10f43 | 613 | return hard_iface; |
c6c8fea2 | 614 | |
5bc7c1eb SW |
615 | free_sysfs: |
616 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 617 | free_if: |
e6c10f43 | 618 | kfree(hard_iface); |
c6c8fea2 SE |
619 | release_dev: |
620 | dev_put(net_dev); | |
621 | out: | |
622 | return NULL; | |
623 | } | |
624 | ||
56303d34 | 625 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 626 | { |
c3caf519 SE |
627 | ASSERT_RTNL(); |
628 | ||
c6c8fea2 | 629 | /* first deactivate interface */ |
e9a4f295 | 630 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
631 | batadv_hardif_disable_interface(hard_iface, |
632 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 633 | |
e9a4f295 | 634 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
635 | return; |
636 | ||
e9a4f295 | 637 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 638 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
639 | } |
640 | ||
9563877e | 641 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 642 | { |
56303d34 | 643 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 644 | |
c3caf519 | 645 | rtnl_lock(); |
e6c10f43 | 646 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 647 | &batadv_hardif_list, list) { |
e6c10f43 | 648 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 649 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
650 | } |
651 | rtnl_unlock(); | |
652 | } | |
653 | ||
18a1cb6e SE |
654 | static int batadv_hard_if_event(struct notifier_block *this, |
655 | unsigned long event, void *ptr) | |
c6c8fea2 | 656 | { |
351638e7 | 657 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
658 | struct batadv_hard_iface *hard_iface; |
659 | struct batadv_hard_iface *primary_if = NULL; | |
660 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 661 | |
37130293 SE |
662 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
663 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
664 | bat_priv = netdev_priv(net_dev); |
665 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
666 | return NOTIFY_DONE; |
667 | } | |
668 | ||
56303d34 | 669 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 670 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 671 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 672 | |
e6c10f43 | 673 | if (!hard_iface) |
c6c8fea2 SE |
674 | goto out; |
675 | ||
676 | switch (event) { | |
677 | case NETDEV_UP: | |
18a1cb6e | 678 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
679 | break; |
680 | case NETDEV_GOING_DOWN: | |
681 | case NETDEV_DOWN: | |
18a1cb6e | 682 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
683 | break; |
684 | case NETDEV_UNREGISTER: | |
e6c10f43 | 685 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 686 | |
18a1cb6e | 687 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
688 | break; |
689 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 690 | if (hard_iface->soft_iface) |
9563877e | 691 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
692 | break; |
693 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 694 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
695 | goto hardif_put; |
696 | ||
18a1cb6e | 697 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 698 | |
e6c10f43 | 699 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 700 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 701 | |
e5d89254 | 702 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
703 | if (!primary_if) |
704 | goto hardif_put; | |
705 | ||
706 | if (hard_iface == primary_if) | |
18a1cb6e | 707 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
708 | break; |
709 | default: | |
710 | break; | |
f81c6224 | 711 | } |
c6c8fea2 SE |
712 | |
713 | hardif_put: | |
e5d89254 | 714 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 715 | out: |
32ae9b22 | 716 | if (primary_if) |
e5d89254 | 717 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
718 | return NOTIFY_DONE; |
719 | } | |
720 | ||
9563877e | 721 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 722 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 723 | }; |