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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> | |
cef63419 | 35 | #include <linux/spinlock.h> |
1e2c2a4f SE |
36 | #include <linux/workqueue.h> |
37 | #include <net/net_namespace.h> | |
38 | ||
39 | #include "bridge_loop_avoidance.h" | |
40 | #include "debugfs.h" | |
41 | #include "distributed-arp-table.h" | |
42 | #include "gateway_client.h" | |
43 | #include "originator.h" | |
44 | #include "packet.h" | |
45 | #include "send.h" | |
46 | #include "soft-interface.h" | |
47 | #include "sysfs.h" | |
48 | #include "translation-table.h" | |
c6c8fea2 | 49 | |
9563877e | 50 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 51 | { |
56303d34 | 52 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 53 | |
56303d34 | 54 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
55 | dev_put(hard_iface->net_dev); |
56 | kfree(hard_iface); | |
c6c8fea2 SE |
57 | } |
58 | ||
56303d34 SE |
59 | struct batadv_hard_iface * |
60 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 61 | { |
56303d34 | 62 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
63 | |
64 | rcu_read_lock(); | |
3193e8fd | 65 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
66 | if (hard_iface->net_dev == net_dev && |
67 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
68 | goto out; |
69 | } | |
70 | ||
e6c10f43 | 71 | hard_iface = NULL; |
c6c8fea2 SE |
72 | |
73 | out: | |
c6c8fea2 | 74 | rcu_read_unlock(); |
e6c10f43 | 75 | return hard_iface; |
c6c8fea2 SE |
76 | } |
77 | ||
1bc4e2b0 AL |
78 | /** |
79 | * batadv_mutual_parents - check if two devices are each others parent | |
80 | * @dev1: 1st net_device | |
81 | * @dev2: 2nd net_device | |
82 | * | |
83 | * veth devices come in pairs and each is the parent of the other! | |
84 | * | |
85 | * Return: true if the devices are each others parent, otherwise false | |
86 | */ | |
87 | static bool batadv_mutual_parents(const struct net_device *dev1, | |
88 | const struct net_device *dev2) | |
89 | { | |
90 | int dev1_parent_iflink = dev_get_iflink(dev1); | |
91 | int dev2_parent_iflink = dev_get_iflink(dev2); | |
92 | ||
93 | if (!dev1_parent_iflink || !dev2_parent_iflink) | |
94 | return false; | |
95 | ||
96 | return (dev1_parent_iflink == dev2->ifindex) && | |
97 | (dev2_parent_iflink == dev1->ifindex); | |
98 | } | |
99 | ||
b7eddd0b AQ |
100 | /** |
101 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
102 | * @net_dev: the device to check | |
103 | * | |
104 | * If the user creates any virtual device on top of a batman-adv interface, it | |
105 | * is important to prevent this new interface to be used to create a new mesh | |
106 | * network (this behaviour would lead to a batman-over-batman configuration). | |
107 | * This function recursively checks all the fathers of the device passed as | |
108 | * argument looking for a batman-adv soft interface. | |
109 | * | |
110 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
111 | * if it is a batman-adv interface itself), false otherwise | |
112 | */ | |
113 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
114 | { | |
115 | struct net_device *parent_dev; | |
116 | bool ret; | |
117 | ||
118 | /* check if this is a batman-adv mesh interface */ | |
119 | if (batadv_softif_is_valid(net_dev)) | |
120 | return true; | |
121 | ||
122 | /* no more parents..stop recursion */ | |
a54acb3a ND |
123 | if (dev_get_iflink(net_dev) == 0 || |
124 | dev_get_iflink(net_dev) == net_dev->ifindex) | |
b7eddd0b AQ |
125 | return false; |
126 | ||
127 | /* recurse over the parent device */ | |
a54acb3a | 128 | parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev)); |
b7eddd0b AQ |
129 | /* if we got a NULL parent_dev there is something broken.. */ |
130 | if (WARN(!parent_dev, "Cannot find parent device")) | |
131 | return false; | |
132 | ||
1bc4e2b0 AL |
133 | if (batadv_mutual_parents(net_dev, parent_dev)) |
134 | return false; | |
135 | ||
b7eddd0b AQ |
136 | ret = batadv_is_on_batman_iface(parent_dev); |
137 | ||
b7eddd0b AQ |
138 | return ret; |
139 | } | |
140 | ||
18a1cb6e | 141 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
142 | { |
143 | if (net_dev->flags & IFF_LOOPBACK) | |
144 | return 0; | |
145 | ||
146 | if (net_dev->type != ARPHRD_ETHER) | |
147 | return 0; | |
148 | ||
149 | if (net_dev->addr_len != ETH_ALEN) | |
150 | return 0; | |
151 | ||
152 | /* no batman over batman */ | |
b7eddd0b | 153 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 154 | return 0; |
c6c8fea2 | 155 | |
c6c8fea2 SE |
156 | return 1; |
157 | } | |
158 | ||
de68d100 MS |
159 | /** |
160 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
161 | * interface | |
162 | * @net_device: the device to check | |
163 | * | |
164 | * Returns true if the net device is a 802.11 wireless device, false otherwise. | |
165 | */ | |
0c69aecc | 166 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 167 | { |
0c69aecc AQ |
168 | if (!net_device) |
169 | return false; | |
170 | ||
de68d100 MS |
171 | #ifdef CONFIG_WIRELESS_EXT |
172 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
173 | * check for wireless_handlers != NULL | |
174 | */ | |
175 | if (net_device->wireless_handlers) | |
176 | return true; | |
177 | #endif | |
178 | ||
179 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
180 | if (net_device->ieee80211_ptr) | |
181 | return true; | |
182 | ||
183 | return false; | |
184 | } | |
185 | ||
56303d34 | 186 | static struct batadv_hard_iface * |
18a1cb6e | 187 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 188 | { |
56303d34 | 189 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
190 | |
191 | rcu_read_lock(); | |
3193e8fd | 192 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 193 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
194 | continue; |
195 | ||
e9a4f295 | 196 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 197 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
198 | goto out; |
199 | } | |
200 | ||
e6c10f43 | 201 | hard_iface = NULL; |
c6c8fea2 SE |
202 | |
203 | out: | |
c6c8fea2 | 204 | rcu_read_unlock(); |
e6c10f43 | 205 | return hard_iface; |
c6c8fea2 SE |
206 | } |
207 | ||
56303d34 SE |
208 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
209 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 210 | { |
56303d34 | 211 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 212 | |
e5d89254 | 213 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
214 | if (!primary_if) |
215 | goto out; | |
c6c8fea2 | 216 | |
785ea114 | 217 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 218 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
219 | out: |
220 | if (primary_if) | |
e5d89254 | 221 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
222 | } |
223 | ||
56303d34 SE |
224 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
225 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 226 | { |
56303d34 | 227 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 228 | |
c3caf519 | 229 | ASSERT_RTNL(); |
c6c8fea2 | 230 | |
32ae9b22 ML |
231 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
232 | new_hard_iface = NULL; | |
c6c8fea2 | 233 | |
728cbc6a | 234 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 235 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 236 | |
32ae9b22 | 237 | if (!new_hard_iface) |
23721387 | 238 | goto out; |
32ae9b22 | 239 | |
cd8b78e7 | 240 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 241 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
242 | |
243 | out: | |
244 | if (curr_hard_iface) | |
e5d89254 | 245 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
246 | } |
247 | ||
56303d34 SE |
248 | static bool |
249 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 250 | { |
e6c10f43 | 251 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
252 | return true; |
253 | ||
254 | return false; | |
255 | } | |
256 | ||
18a1cb6e | 257 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 258 | { |
56303d34 | 259 | const struct batadv_hard_iface *hard_iface; |
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->net_dev == net_dev) |
c6c8fea2 SE |
268 | continue; |
269 | ||
1eda58bf SE |
270 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
271 | net_dev->dev_addr)) | |
c6c8fea2 SE |
272 | continue; |
273 | ||
67969581 SE |
274 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
275 | net_dev->dev_addr, hard_iface->net_dev->name); | |
276 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
277 | } |
278 | rcu_read_unlock(); | |
279 | } | |
280 | ||
7bca68c7 SE |
281 | /** |
282 | * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom | |
283 | * @soft_iface: netdev struct of the mesh interface | |
284 | */ | |
285 | static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) | |
286 | { | |
287 | const struct batadv_hard_iface *hard_iface; | |
288 | unsigned short lower_header_len = ETH_HLEN; | |
289 | unsigned short lower_headroom = 0; | |
290 | unsigned short lower_tailroom = 0; | |
291 | unsigned short needed_headroom; | |
292 | ||
293 | rcu_read_lock(); | |
294 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
295 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) | |
296 | continue; | |
297 | ||
298 | if (hard_iface->soft_iface != soft_iface) | |
299 | continue; | |
300 | ||
301 | lower_header_len = max_t(unsigned short, lower_header_len, | |
302 | hard_iface->net_dev->hard_header_len); | |
303 | ||
304 | lower_headroom = max_t(unsigned short, lower_headroom, | |
305 | hard_iface->net_dev->needed_headroom); | |
306 | ||
307 | lower_tailroom = max_t(unsigned short, lower_tailroom, | |
308 | hard_iface->net_dev->needed_tailroom); | |
309 | } | |
310 | rcu_read_unlock(); | |
311 | ||
312 | needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); | |
313 | needed_headroom += batadv_max_header_len(); | |
314 | ||
315 | soft_iface->needed_headroom = needed_headroom; | |
316 | soft_iface->needed_tailroom = lower_tailroom; | |
317 | } | |
318 | ||
9563877e | 319 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 320 | { |
a19d3d85 | 321 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 322 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 323 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
324 | |
325 | rcu_read_lock(); | |
3193e8fd | 326 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
327 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
328 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
329 | continue; |
330 | ||
e6c10f43 | 331 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
332 | continue; |
333 | ||
a19d3d85 | 334 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
335 | } |
336 | rcu_read_unlock(); | |
a19d3d85 | 337 | |
a19d3d85 ML |
338 | if (atomic_read(&bat_priv->fragmentation) == 0) |
339 | goto out; | |
340 | ||
341 | /* with fragmentation enabled the maximum size of internally generated | |
342 | * packets such as translation table exchanges or tvlv containers, etc | |
343 | * has to be calculated | |
344 | */ | |
345 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
346 | min_mtu -= sizeof(struct batadv_frag_packet); | |
347 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 348 | |
c6c8fea2 | 349 | out: |
930cd6e4 AQ |
350 | /* report to the other components the maximum amount of bytes that |
351 | * batman-adv can send over the wire (without considering the payload | |
352 | * overhead). For example, this value is used by TT to compute the | |
353 | * maximum local table table size | |
354 | */ | |
355 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
356 | ||
357 | /* the real soft-interface MTU is computed by removing the payload | |
358 | * overhead from the maximum amount of bytes that was just computed. | |
359 | * | |
360 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
361 | */ | |
362 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
363 | } |
364 | ||
365 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 366 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 367 | { |
a19d3d85 | 368 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 369 | |
a19d3d85 ML |
370 | /* Check if the local translate table should be cleaned up to match a |
371 | * new (and smaller) MTU. | |
372 | */ | |
373 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
374 | } |
375 | ||
56303d34 SE |
376 | static void |
377 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 378 | { |
56303d34 SE |
379 | struct batadv_priv *bat_priv; |
380 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 381 | |
e9a4f295 | 382 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 383 | goto out; |
c6c8fea2 | 384 | |
e6c10f43 | 385 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 386 | |
c3229398 | 387 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 388 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 389 | |
9cfc7bd6 | 390 | /* the first active interface becomes our primary interface or |
015758d0 | 391 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 392 | */ |
e5d89254 | 393 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 394 | if (!primary_if) |
18a1cb6e | 395 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 396 | |
3e34819e SE |
397 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
398 | hard_iface->net_dev->name); | |
c6c8fea2 | 399 | |
9563877e | 400 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
401 | |
402 | out: | |
403 | if (primary_if) | |
e5d89254 | 404 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
405 | } |
406 | ||
56303d34 SE |
407 | static void |
408 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 409 | { |
e9a4f295 SE |
410 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
411 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
412 | return; |
413 | ||
e9a4f295 | 414 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 415 | |
3e34819e SE |
416 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
417 | hard_iface->net_dev->name); | |
c6c8fea2 | 418 | |
9563877e | 419 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
420 | } |
421 | ||
cb4b0d48 AQ |
422 | /** |
423 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
424 | * @slave: the interface enslaved in another master | |
425 | * @master: the master from which slave has to be removed | |
426 | * | |
427 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
428 | * is free'd and master can correctly change its internal state. | |
429 | * Return 0 on success, a negative value representing the error otherwise | |
430 | */ | |
431 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
432 | struct net_device *master) | |
433 | { | |
434 | int ret; | |
435 | ||
436 | if (!master) | |
437 | return 0; | |
438 | ||
439 | ret = -EBUSY; | |
440 | if (master->netdev_ops->ndo_del_slave) | |
441 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
56303d34 | 446 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 447 | const char *iface_name) |
c6c8fea2 | 448 | { |
56303d34 | 449 | struct batadv_priv *bat_priv; |
cb4b0d48 | 450 | struct net_device *soft_iface, *master; |
293e9338 | 451 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 452 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 453 | int ret; |
c6c8fea2 | 454 | |
e9a4f295 | 455 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
456 | goto out; |
457 | ||
e6c10f43 | 458 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
459 | goto out; |
460 | ||
e44d8fe2 | 461 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 462 | |
e44d8fe2 | 463 | if (!soft_iface) { |
04b482a2 | 464 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 465 | |
e44d8fe2 SE |
466 | if (!soft_iface) { |
467 | ret = -ENOMEM; | |
c6c8fea2 | 468 | goto err; |
e44d8fe2 | 469 | } |
c6c8fea2 SE |
470 | |
471 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
472 | dev_hold(soft_iface); |
473 | } | |
474 | ||
04b482a2 | 475 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 476 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 477 | soft_iface->name); |
e44d8fe2 | 478 | ret = -EINVAL; |
77af7575 | 479 | goto err_dev; |
c6c8fea2 SE |
480 | } |
481 | ||
cb4b0d48 AQ |
482 | /* check if the interface is enslaved in another virtual one and |
483 | * in that case unlink it first | |
484 | */ | |
485 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
486 | ret = batadv_master_del_slave(hard_iface, master); | |
487 | if (ret) | |
488 | goto err_dev; | |
489 | ||
e44d8fe2 | 490 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 491 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 492 | |
6dffb044 | 493 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, |
29bf24af | 494 | soft_iface, NULL, NULL); |
3dbd550b SE |
495 | if (ret) |
496 | goto err_dev; | |
497 | ||
77af7575 | 498 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 499 | if (ret < 0) |
3dbd550b | 500 | goto err_upper; |
c6c8fea2 | 501 | |
e6c10f43 | 502 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 503 | bat_priv->num_ifaces++; |
e9a4f295 | 504 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
505 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
506 | if (ret < 0) { | |
507 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
508 | bat_priv->num_ifaces--; | |
509 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 510 | goto err_upper; |
62446307 | 511 | } |
c6c8fea2 | 512 | |
7e071c79 | 513 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 514 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
515 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
516 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 517 | |
3e34819e SE |
518 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
519 | hard_iface->net_dev->name); | |
c6c8fea2 | 520 | |
0aca2369 | 521 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 522 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 523 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 524 | "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 | 525 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 526 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 527 | |
0aca2369 | 528 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 529 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 530 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 531 | "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 | 532 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 533 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 534 | |
18a1cb6e SE |
535 | if (batadv_hardif_is_iface_up(hard_iface)) |
536 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 537 | else |
3e34819e SE |
538 | batadv_err(hard_iface->soft_iface, |
539 | "Not using interface %s (retrying later): interface not active\n", | |
540 | hard_iface->net_dev->name); | |
c6c8fea2 | 541 | |
7bca68c7 SE |
542 | batadv_hardif_recalc_extra_skbroom(soft_iface); |
543 | ||
c6c8fea2 | 544 | /* begin scheduling originator messages on that interface */ |
9455e34c | 545 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
546 | |
547 | out: | |
548 | return 0; | |
549 | ||
3dbd550b SE |
550 | err_upper: |
551 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 552 | err_dev: |
3dbd550b | 553 | hard_iface->soft_iface = NULL; |
77af7575 | 554 | dev_put(soft_iface); |
c6c8fea2 | 555 | err: |
e5d89254 | 556 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 557 | return ret; |
c6c8fea2 SE |
558 | } |
559 | ||
a15fd361 SE |
560 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
561 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 562 | { |
56303d34 SE |
563 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
564 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 565 | |
e9a4f295 | 566 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 567 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 568 | |
e9a4f295 | 569 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 570 | goto out; |
c6c8fea2 | 571 | |
3e34819e SE |
572 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
573 | hard_iface->net_dev->name); | |
e6c10f43 | 574 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
575 | |
576 | bat_priv->num_ifaces--; | |
7d211efc | 577 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 578 | |
e5d89254 | 579 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 580 | if (hard_iface == primary_if) { |
56303d34 | 581 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 582 | |
18a1cb6e SE |
583 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
584 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
585 | |
586 | if (new_if) | |
e5d89254 | 587 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
588 | } |
589 | ||
00a50076 | 590 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 591 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 592 | |
e6c10f43 | 593 | /* delete all references to this hard_iface */ |
7d211efc | 594 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 595 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 596 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 597 | |
a5256f7e | 598 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
7bca68c7 | 599 | batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
a5256f7e | 600 | |
c6c8fea2 | 601 | /* nobody uses this interface anymore */ |
8257f55a AQ |
602 | if (!bat_priv->num_ifaces) { |
603 | batadv_gw_check_client_stop(bat_priv); | |
604 | ||
605 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
606 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
607 | } | |
c6c8fea2 | 608 | |
e6c10f43 | 609 | hard_iface->soft_iface = NULL; |
e5d89254 | 610 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
611 | |
612 | out: | |
613 | if (primary_if) | |
e5d89254 | 614 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
615 | } |
616 | ||
5bc44dc8 SW |
617 | /** |
618 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
619 | * @work: work queue item | |
620 | * | |
621 | * Free the parts of the hard interface which can not be removed under | |
622 | * rtnl lock (to prevent deadlock situations). | |
623 | */ | |
624 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
625 | { | |
626 | struct batadv_hard_iface *hard_iface; | |
627 | ||
628 | hard_iface = container_of(work, struct batadv_hard_iface, | |
629 | cleanup_work); | |
630 | ||
5bc7c1eb | 631 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 SW |
632 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
633 | batadv_hardif_free_ref(hard_iface); | |
634 | } | |
635 | ||
56303d34 | 636 | static struct batadv_hard_iface * |
18a1cb6e | 637 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 638 | { |
56303d34 | 639 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
640 | int ret; |
641 | ||
c3caf519 SE |
642 | ASSERT_RTNL(); |
643 | ||
18a1cb6e | 644 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
645 | if (ret != 1) |
646 | goto out; | |
647 | ||
648 | dev_hold(net_dev); | |
649 | ||
7db3fc29 | 650 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 651 | if (!hard_iface) |
c6c8fea2 | 652 | goto release_dev; |
c6c8fea2 | 653 | |
5853e22c | 654 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
655 | if (ret) |
656 | goto free_if; | |
657 | ||
e6c10f43 ML |
658 | hard_iface->if_num = -1; |
659 | hard_iface->net_dev = net_dev; | |
660 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 661 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
662 | |
663 | ret = batadv_debugfs_add_hardif(hard_iface); | |
664 | if (ret) | |
665 | goto free_sysfs; | |
666 | ||
e6c10f43 | 667 | INIT_LIST_HEAD(&hard_iface->list); |
cef63419 | 668 | INIT_HLIST_HEAD(&hard_iface->neigh_list); |
5bc44dc8 SW |
669 | INIT_WORK(&hard_iface->cleanup_work, |
670 | batadv_hardif_remove_interface_finish); | |
671 | ||
cef63419 ML |
672 | spin_lock_init(&hard_iface->neigh_list_lock); |
673 | ||
caf65bfc MS |
674 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
675 | if (batadv_is_wifi_netdev(net_dev)) | |
676 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
677 | ||
ed75ccbe | 678 | /* extra reference for return */ |
e6c10f43 | 679 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 680 | |
18a1cb6e | 681 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 682 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 683 | |
e6c10f43 | 684 | return hard_iface; |
c6c8fea2 | 685 | |
5bc7c1eb SW |
686 | free_sysfs: |
687 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 688 | free_if: |
e6c10f43 | 689 | kfree(hard_iface); |
c6c8fea2 SE |
690 | release_dev: |
691 | dev_put(net_dev); | |
692 | out: | |
693 | return NULL; | |
694 | } | |
695 | ||
56303d34 | 696 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 697 | { |
c3caf519 SE |
698 | ASSERT_RTNL(); |
699 | ||
c6c8fea2 | 700 | /* first deactivate interface */ |
e9a4f295 | 701 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
702 | batadv_hardif_disable_interface(hard_iface, |
703 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 704 | |
e9a4f295 | 705 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
706 | return; |
707 | ||
e9a4f295 | 708 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 709 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
710 | } |
711 | ||
9563877e | 712 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 713 | { |
56303d34 | 714 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 715 | |
c3caf519 | 716 | rtnl_lock(); |
e6c10f43 | 717 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 718 | &batadv_hardif_list, list) { |
e6c10f43 | 719 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 720 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
721 | } |
722 | rtnl_unlock(); | |
723 | } | |
724 | ||
18a1cb6e SE |
725 | static int batadv_hard_if_event(struct notifier_block *this, |
726 | unsigned long event, void *ptr) | |
c6c8fea2 | 727 | { |
351638e7 | 728 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
729 | struct batadv_hard_iface *hard_iface; |
730 | struct batadv_hard_iface *primary_if = NULL; | |
731 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 732 | |
37130293 SE |
733 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
734 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
735 | bat_priv = netdev_priv(net_dev); |
736 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
737 | return NOTIFY_DONE; |
738 | } | |
739 | ||
56303d34 | 740 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
a1a66b11 AL |
741 | if (!hard_iface && (event == NETDEV_REGISTER || |
742 | event == NETDEV_POST_TYPE_CHANGE)) | |
18a1cb6e | 743 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 744 | |
e6c10f43 | 745 | if (!hard_iface) |
c6c8fea2 SE |
746 | goto out; |
747 | ||
748 | switch (event) { | |
749 | case NETDEV_UP: | |
18a1cb6e | 750 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
751 | break; |
752 | case NETDEV_GOING_DOWN: | |
753 | case NETDEV_DOWN: | |
18a1cb6e | 754 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
755 | break; |
756 | case NETDEV_UNREGISTER: | |
a1a66b11 | 757 | case NETDEV_PRE_TYPE_CHANGE: |
e6c10f43 | 758 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 759 | |
18a1cb6e | 760 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
761 | break; |
762 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 763 | if (hard_iface->soft_iface) |
9563877e | 764 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
765 | break; |
766 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 767 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
768 | goto hardif_put; |
769 | ||
18a1cb6e | 770 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 771 | |
e6c10f43 | 772 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 773 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 774 | |
e5d89254 | 775 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
776 | if (!primary_if) |
777 | goto hardif_put; | |
778 | ||
779 | if (hard_iface == primary_if) | |
18a1cb6e | 780 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
781 | break; |
782 | default: | |
783 | break; | |
f81c6224 | 784 | } |
c6c8fea2 SE |
785 | |
786 | hardif_put: | |
e5d89254 | 787 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 788 | out: |
32ae9b22 | 789 | if (primary_if) |
e5d89254 | 790 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
791 | return NOTIFY_DONE; |
792 | } | |
793 | ||
9563877e | 794 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 795 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 796 | }; |