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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 | ||
b7eddd0b AQ |
78 | /** |
79 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
80 | * @net_dev: the device to check | |
81 | * | |
82 | * If the user creates any virtual device on top of a batman-adv interface, it | |
83 | * is important to prevent this new interface to be used to create a new mesh | |
84 | * network (this behaviour would lead to a batman-over-batman configuration). | |
85 | * This function recursively checks all the fathers of the device passed as | |
86 | * argument looking for a batman-adv soft interface. | |
87 | * | |
88 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
89 | * if it is a batman-adv interface itself), false otherwise | |
90 | */ | |
91 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
92 | { | |
93 | struct net_device *parent_dev; | |
94 | bool ret; | |
95 | ||
96 | /* check if this is a batman-adv mesh interface */ | |
97 | if (batadv_softif_is_valid(net_dev)) | |
98 | return true; | |
99 | ||
100 | /* no more parents..stop recursion */ | |
a54acb3a ND |
101 | if (dev_get_iflink(net_dev) == 0 || |
102 | dev_get_iflink(net_dev) == net_dev->ifindex) | |
b7eddd0b AQ |
103 | return false; |
104 | ||
105 | /* recurse over the parent device */ | |
a54acb3a | 106 | parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev)); |
b7eddd0b AQ |
107 | /* if we got a NULL parent_dev there is something broken.. */ |
108 | if (WARN(!parent_dev, "Cannot find parent device")) | |
109 | return false; | |
110 | ||
111 | ret = batadv_is_on_batman_iface(parent_dev); | |
112 | ||
b7eddd0b AQ |
113 | return ret; |
114 | } | |
115 | ||
18a1cb6e | 116 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
117 | { |
118 | if (net_dev->flags & IFF_LOOPBACK) | |
119 | return 0; | |
120 | ||
121 | if (net_dev->type != ARPHRD_ETHER) | |
122 | return 0; | |
123 | ||
124 | if (net_dev->addr_len != ETH_ALEN) | |
125 | return 0; | |
126 | ||
127 | /* no batman over batman */ | |
b7eddd0b | 128 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 129 | return 0; |
c6c8fea2 | 130 | |
c6c8fea2 SE |
131 | return 1; |
132 | } | |
133 | ||
de68d100 MS |
134 | /** |
135 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
136 | * interface | |
137 | * @net_device: the device to check | |
138 | * | |
139 | * Returns true if the net device is a 802.11 wireless device, false otherwise. | |
140 | */ | |
0c69aecc | 141 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 142 | { |
0c69aecc AQ |
143 | if (!net_device) |
144 | return false; | |
145 | ||
de68d100 MS |
146 | #ifdef CONFIG_WIRELESS_EXT |
147 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
148 | * check for wireless_handlers != NULL | |
149 | */ | |
150 | if (net_device->wireless_handlers) | |
151 | return true; | |
152 | #endif | |
153 | ||
154 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
155 | if (net_device->ieee80211_ptr) | |
156 | return true; | |
157 | ||
158 | return false; | |
159 | } | |
160 | ||
56303d34 | 161 | static struct batadv_hard_iface * |
18a1cb6e | 162 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 163 | { |
56303d34 | 164 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
165 | |
166 | rcu_read_lock(); | |
3193e8fd | 167 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 168 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
169 | continue; |
170 | ||
e9a4f295 | 171 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 172 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
173 | goto out; |
174 | } | |
175 | ||
e6c10f43 | 176 | hard_iface = NULL; |
c6c8fea2 SE |
177 | |
178 | out: | |
c6c8fea2 | 179 | rcu_read_unlock(); |
e6c10f43 | 180 | return hard_iface; |
c6c8fea2 SE |
181 | } |
182 | ||
56303d34 SE |
183 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
184 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 185 | { |
56303d34 | 186 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 187 | |
e5d89254 | 188 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
189 | if (!primary_if) |
190 | goto out; | |
c6c8fea2 | 191 | |
785ea114 | 192 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 193 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
194 | out: |
195 | if (primary_if) | |
e5d89254 | 196 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
197 | } |
198 | ||
56303d34 SE |
199 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
200 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 201 | { |
56303d34 | 202 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 203 | |
c3caf519 | 204 | ASSERT_RTNL(); |
c6c8fea2 | 205 | |
32ae9b22 ML |
206 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
207 | new_hard_iface = NULL; | |
c6c8fea2 | 208 | |
728cbc6a | 209 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 210 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 211 | |
32ae9b22 | 212 | if (!new_hard_iface) |
23721387 | 213 | goto out; |
32ae9b22 | 214 | |
cd8b78e7 | 215 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 216 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
217 | |
218 | out: | |
219 | if (curr_hard_iface) | |
e5d89254 | 220 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
221 | } |
222 | ||
56303d34 SE |
223 | static bool |
224 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 225 | { |
e6c10f43 | 226 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
227 | return true; |
228 | ||
229 | return false; | |
230 | } | |
231 | ||
18a1cb6e | 232 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 233 | { |
56303d34 | 234 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
235 | |
236 | rcu_read_lock(); | |
3193e8fd | 237 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
238 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
239 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
240 | continue; |
241 | ||
e6c10f43 | 242 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
243 | continue; |
244 | ||
1eda58bf SE |
245 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
246 | net_dev->dev_addr)) | |
c6c8fea2 SE |
247 | continue; |
248 | ||
67969581 SE |
249 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
250 | net_dev->dev_addr, hard_iface->net_dev->name); | |
251 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
252 | } |
253 | rcu_read_unlock(); | |
254 | } | |
255 | ||
7bca68c7 SE |
256 | /** |
257 | * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom | |
258 | * @soft_iface: netdev struct of the mesh interface | |
259 | */ | |
260 | static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) | |
261 | { | |
262 | const struct batadv_hard_iface *hard_iface; | |
263 | unsigned short lower_header_len = ETH_HLEN; | |
264 | unsigned short lower_headroom = 0; | |
265 | unsigned short lower_tailroom = 0; | |
266 | unsigned short needed_headroom; | |
267 | ||
268 | rcu_read_lock(); | |
269 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
270 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) | |
271 | continue; | |
272 | ||
273 | if (hard_iface->soft_iface != soft_iface) | |
274 | continue; | |
275 | ||
276 | lower_header_len = max_t(unsigned short, lower_header_len, | |
277 | hard_iface->net_dev->hard_header_len); | |
278 | ||
279 | lower_headroom = max_t(unsigned short, lower_headroom, | |
280 | hard_iface->net_dev->needed_headroom); | |
281 | ||
282 | lower_tailroom = max_t(unsigned short, lower_tailroom, | |
283 | hard_iface->net_dev->needed_tailroom); | |
284 | } | |
285 | rcu_read_unlock(); | |
286 | ||
287 | needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); | |
288 | needed_headroom += batadv_max_header_len(); | |
289 | ||
290 | soft_iface->needed_headroom = needed_headroom; | |
291 | soft_iface->needed_tailroom = lower_tailroom; | |
292 | } | |
293 | ||
9563877e | 294 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 295 | { |
a19d3d85 | 296 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 297 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 298 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
299 | |
300 | rcu_read_lock(); | |
3193e8fd | 301 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
302 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
303 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
304 | continue; |
305 | ||
e6c10f43 | 306 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
307 | continue; |
308 | ||
a19d3d85 | 309 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
310 | } |
311 | rcu_read_unlock(); | |
a19d3d85 | 312 | |
a19d3d85 ML |
313 | if (atomic_read(&bat_priv->fragmentation) == 0) |
314 | goto out; | |
315 | ||
316 | /* with fragmentation enabled the maximum size of internally generated | |
317 | * packets such as translation table exchanges or tvlv containers, etc | |
318 | * has to be calculated | |
319 | */ | |
320 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
321 | min_mtu -= sizeof(struct batadv_frag_packet); | |
322 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 323 | |
c6c8fea2 | 324 | out: |
930cd6e4 AQ |
325 | /* report to the other components the maximum amount of bytes that |
326 | * batman-adv can send over the wire (without considering the payload | |
327 | * overhead). For example, this value is used by TT to compute the | |
328 | * maximum local table table size | |
329 | */ | |
330 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
331 | ||
332 | /* the real soft-interface MTU is computed by removing the payload | |
333 | * overhead from the maximum amount of bytes that was just computed. | |
334 | * | |
335 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
336 | */ | |
337 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
338 | } |
339 | ||
340 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 341 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 342 | { |
a19d3d85 | 343 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 344 | |
a19d3d85 ML |
345 | /* Check if the local translate table should be cleaned up to match a |
346 | * new (and smaller) MTU. | |
347 | */ | |
348 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
349 | } |
350 | ||
56303d34 SE |
351 | static void |
352 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 353 | { |
56303d34 SE |
354 | struct batadv_priv *bat_priv; |
355 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 356 | |
e9a4f295 | 357 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 358 | goto out; |
c6c8fea2 | 359 | |
e6c10f43 | 360 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 361 | |
c3229398 | 362 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 363 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 364 | |
9cfc7bd6 | 365 | /* the first active interface becomes our primary interface or |
015758d0 | 366 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 367 | */ |
e5d89254 | 368 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 369 | if (!primary_if) |
18a1cb6e | 370 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 371 | |
3e34819e SE |
372 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
373 | hard_iface->net_dev->name); | |
c6c8fea2 | 374 | |
9563877e | 375 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
376 | |
377 | out: | |
378 | if (primary_if) | |
e5d89254 | 379 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
380 | } |
381 | ||
56303d34 SE |
382 | static void |
383 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 384 | { |
e9a4f295 SE |
385 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
386 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
387 | return; |
388 | ||
e9a4f295 | 389 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 390 | |
3e34819e SE |
391 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
392 | hard_iface->net_dev->name); | |
c6c8fea2 | 393 | |
9563877e | 394 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
395 | } |
396 | ||
cb4b0d48 AQ |
397 | /** |
398 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
399 | * @slave: the interface enslaved in another master | |
400 | * @master: the master from which slave has to be removed | |
401 | * | |
402 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
403 | * is free'd and master can correctly change its internal state. | |
404 | * Return 0 on success, a negative value representing the error otherwise | |
405 | */ | |
406 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
407 | struct net_device *master) | |
408 | { | |
409 | int ret; | |
410 | ||
411 | if (!master) | |
412 | return 0; | |
413 | ||
414 | ret = -EBUSY; | |
415 | if (master->netdev_ops->ndo_del_slave) | |
416 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
417 | ||
418 | return ret; | |
419 | } | |
420 | ||
56303d34 | 421 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 422 | const char *iface_name) |
c6c8fea2 | 423 | { |
56303d34 | 424 | struct batadv_priv *bat_priv; |
cb4b0d48 | 425 | struct net_device *soft_iface, *master; |
293e9338 | 426 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 427 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 428 | int ret; |
c6c8fea2 | 429 | |
e9a4f295 | 430 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
431 | goto out; |
432 | ||
e6c10f43 | 433 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
434 | goto out; |
435 | ||
e44d8fe2 | 436 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 437 | |
e44d8fe2 | 438 | if (!soft_iface) { |
04b482a2 | 439 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 440 | |
e44d8fe2 SE |
441 | if (!soft_iface) { |
442 | ret = -ENOMEM; | |
c6c8fea2 | 443 | goto err; |
e44d8fe2 | 444 | } |
c6c8fea2 SE |
445 | |
446 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
447 | dev_hold(soft_iface); |
448 | } | |
449 | ||
04b482a2 | 450 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 451 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 452 | soft_iface->name); |
e44d8fe2 | 453 | ret = -EINVAL; |
77af7575 | 454 | goto err_dev; |
c6c8fea2 SE |
455 | } |
456 | ||
cb4b0d48 AQ |
457 | /* check if the interface is enslaved in another virtual one and |
458 | * in that case unlink it first | |
459 | */ | |
460 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
461 | ret = batadv_master_del_slave(hard_iface, master); | |
462 | if (ret) | |
463 | goto err_dev; | |
464 | ||
e44d8fe2 | 465 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 466 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 467 | |
6dffb044 | 468 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, |
29bf24af | 469 | soft_iface, NULL, NULL); |
3dbd550b SE |
470 | if (ret) |
471 | goto err_dev; | |
472 | ||
77af7575 | 473 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 474 | if (ret < 0) |
3dbd550b | 475 | goto err_upper; |
c6c8fea2 | 476 | |
e6c10f43 | 477 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 478 | bat_priv->num_ifaces++; |
e9a4f295 | 479 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
480 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
481 | if (ret < 0) { | |
482 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
483 | bat_priv->num_ifaces--; | |
484 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 485 | goto err_upper; |
62446307 | 486 | } |
c6c8fea2 | 487 | |
7e071c79 | 488 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 489 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
490 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
491 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 492 | |
3e34819e SE |
493 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
494 | hard_iface->net_dev->name); | |
c6c8fea2 | 495 | |
0aca2369 | 496 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 497 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 498 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 499 | "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 | 500 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 501 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 502 | |
0aca2369 | 503 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 504 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 505 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 506 | "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 | 507 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 508 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 509 | |
18a1cb6e SE |
510 | if (batadv_hardif_is_iface_up(hard_iface)) |
511 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 512 | else |
3e34819e SE |
513 | batadv_err(hard_iface->soft_iface, |
514 | "Not using interface %s (retrying later): interface not active\n", | |
515 | hard_iface->net_dev->name); | |
c6c8fea2 | 516 | |
7bca68c7 SE |
517 | batadv_hardif_recalc_extra_skbroom(soft_iface); |
518 | ||
c6c8fea2 | 519 | /* begin scheduling originator messages on that interface */ |
9455e34c | 520 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
521 | |
522 | out: | |
523 | return 0; | |
524 | ||
3dbd550b SE |
525 | err_upper: |
526 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 527 | err_dev: |
3dbd550b | 528 | hard_iface->soft_iface = NULL; |
77af7575 | 529 | dev_put(soft_iface); |
c6c8fea2 | 530 | err: |
e5d89254 | 531 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 532 | return ret; |
c6c8fea2 SE |
533 | } |
534 | ||
a15fd361 SE |
535 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
536 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 537 | { |
56303d34 SE |
538 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
539 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 540 | |
e9a4f295 | 541 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 542 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 543 | |
e9a4f295 | 544 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 545 | goto out; |
c6c8fea2 | 546 | |
3e34819e SE |
547 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
548 | hard_iface->net_dev->name); | |
e6c10f43 | 549 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
550 | |
551 | bat_priv->num_ifaces--; | |
7d211efc | 552 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 553 | |
e5d89254 | 554 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 555 | if (hard_iface == primary_if) { |
56303d34 | 556 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 557 | |
18a1cb6e SE |
558 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
559 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
560 | |
561 | if (new_if) | |
e5d89254 | 562 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
563 | } |
564 | ||
00a50076 | 565 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 566 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 567 | |
e6c10f43 | 568 | /* delete all references to this hard_iface */ |
7d211efc | 569 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 570 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 571 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 572 | |
a5256f7e | 573 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
7bca68c7 | 574 | batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
a5256f7e | 575 | |
c6c8fea2 | 576 | /* nobody uses this interface anymore */ |
8257f55a AQ |
577 | if (!bat_priv->num_ifaces) { |
578 | batadv_gw_check_client_stop(bat_priv); | |
579 | ||
580 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
581 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
582 | } | |
c6c8fea2 | 583 | |
e6c10f43 | 584 | hard_iface->soft_iface = NULL; |
e5d89254 | 585 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
586 | |
587 | out: | |
588 | if (primary_if) | |
e5d89254 | 589 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
590 | } |
591 | ||
5bc44dc8 SW |
592 | /** |
593 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
594 | * @work: work queue item | |
595 | * | |
596 | * Free the parts of the hard interface which can not be removed under | |
597 | * rtnl lock (to prevent deadlock situations). | |
598 | */ | |
599 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
600 | { | |
601 | struct batadv_hard_iface *hard_iface; | |
602 | ||
603 | hard_iface = container_of(work, struct batadv_hard_iface, | |
604 | cleanup_work); | |
605 | ||
5bc7c1eb | 606 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 SW |
607 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
608 | batadv_hardif_free_ref(hard_iface); | |
609 | } | |
610 | ||
56303d34 | 611 | static struct batadv_hard_iface * |
18a1cb6e | 612 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 613 | { |
56303d34 | 614 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
615 | int ret; |
616 | ||
c3caf519 SE |
617 | ASSERT_RTNL(); |
618 | ||
18a1cb6e | 619 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
620 | if (ret != 1) |
621 | goto out; | |
622 | ||
623 | dev_hold(net_dev); | |
624 | ||
7db3fc29 | 625 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 626 | if (!hard_iface) |
c6c8fea2 | 627 | goto release_dev; |
c6c8fea2 | 628 | |
5853e22c | 629 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
630 | if (ret) |
631 | goto free_if; | |
632 | ||
e6c10f43 ML |
633 | hard_iface->if_num = -1; |
634 | hard_iface->net_dev = net_dev; | |
635 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 636 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
637 | |
638 | ret = batadv_debugfs_add_hardif(hard_iface); | |
639 | if (ret) | |
640 | goto free_sysfs; | |
641 | ||
e6c10f43 | 642 | INIT_LIST_HEAD(&hard_iface->list); |
cef63419 | 643 | INIT_HLIST_HEAD(&hard_iface->neigh_list); |
5bc44dc8 SW |
644 | INIT_WORK(&hard_iface->cleanup_work, |
645 | batadv_hardif_remove_interface_finish); | |
646 | ||
cef63419 ML |
647 | spin_lock_init(&hard_iface->neigh_list_lock); |
648 | ||
caf65bfc MS |
649 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
650 | if (batadv_is_wifi_netdev(net_dev)) | |
651 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
652 | ||
ed75ccbe | 653 | /* extra reference for return */ |
e6c10f43 | 654 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 655 | |
18a1cb6e | 656 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 657 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 658 | |
e6c10f43 | 659 | return hard_iface; |
c6c8fea2 | 660 | |
5bc7c1eb SW |
661 | free_sysfs: |
662 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 663 | free_if: |
e6c10f43 | 664 | kfree(hard_iface); |
c6c8fea2 SE |
665 | release_dev: |
666 | dev_put(net_dev); | |
667 | out: | |
668 | return NULL; | |
669 | } | |
670 | ||
56303d34 | 671 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 672 | { |
c3caf519 SE |
673 | ASSERT_RTNL(); |
674 | ||
c6c8fea2 | 675 | /* first deactivate interface */ |
e9a4f295 | 676 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
677 | batadv_hardif_disable_interface(hard_iface, |
678 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 679 | |
e9a4f295 | 680 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
681 | return; |
682 | ||
e9a4f295 | 683 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 684 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
685 | } |
686 | ||
9563877e | 687 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 688 | { |
56303d34 | 689 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 690 | |
c3caf519 | 691 | rtnl_lock(); |
e6c10f43 | 692 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 693 | &batadv_hardif_list, list) { |
e6c10f43 | 694 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 695 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
696 | } |
697 | rtnl_unlock(); | |
698 | } | |
699 | ||
18a1cb6e SE |
700 | static int batadv_hard_if_event(struct notifier_block *this, |
701 | unsigned long event, void *ptr) | |
c6c8fea2 | 702 | { |
351638e7 | 703 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
704 | struct batadv_hard_iface *hard_iface; |
705 | struct batadv_hard_iface *primary_if = NULL; | |
706 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 707 | |
37130293 SE |
708 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
709 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
710 | bat_priv = netdev_priv(net_dev); |
711 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
712 | return NOTIFY_DONE; |
713 | } | |
714 | ||
56303d34 | 715 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
a1a66b11 AL |
716 | if (!hard_iface && (event == NETDEV_REGISTER || |
717 | event == NETDEV_POST_TYPE_CHANGE)) | |
18a1cb6e | 718 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 719 | |
e6c10f43 | 720 | if (!hard_iface) |
c6c8fea2 SE |
721 | goto out; |
722 | ||
723 | switch (event) { | |
724 | case NETDEV_UP: | |
18a1cb6e | 725 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
726 | break; |
727 | case NETDEV_GOING_DOWN: | |
728 | case NETDEV_DOWN: | |
18a1cb6e | 729 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
730 | break; |
731 | case NETDEV_UNREGISTER: | |
a1a66b11 | 732 | case NETDEV_PRE_TYPE_CHANGE: |
e6c10f43 | 733 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 734 | |
18a1cb6e | 735 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
736 | break; |
737 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 738 | if (hard_iface->soft_iface) |
9563877e | 739 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
740 | break; |
741 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 742 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
743 | goto hardif_put; |
744 | ||
18a1cb6e | 745 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 746 | |
e6c10f43 | 747 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 748 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 749 | |
e5d89254 | 750 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
751 | if (!primary_if) |
752 | goto hardif_put; | |
753 | ||
754 | if (hard_iface == primary_if) | |
18a1cb6e | 755 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
756 | break; |
757 | default: | |
758 | break; | |
f81c6224 | 759 | } |
c6c8fea2 SE |
760 | |
761 | hardif_put: | |
e5d89254 | 762 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 763 | out: |
32ae9b22 | 764 | if (primary_if) |
e5d89254 | 765 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
766 | return NOTIFY_DONE; |
767 | } | |
768 | ||
9563877e | 769 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 770 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 771 | }; |