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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 | ||
7bca68c7 SE |
255 | /** |
256 | * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom | |
257 | * @soft_iface: netdev struct of the mesh interface | |
258 | */ | |
259 | static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) | |
260 | { | |
261 | const struct batadv_hard_iface *hard_iface; | |
262 | unsigned short lower_header_len = ETH_HLEN; | |
263 | unsigned short lower_headroom = 0; | |
264 | unsigned short lower_tailroom = 0; | |
265 | unsigned short needed_headroom; | |
266 | ||
267 | rcu_read_lock(); | |
268 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
269 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) | |
270 | continue; | |
271 | ||
272 | if (hard_iface->soft_iface != soft_iface) | |
273 | continue; | |
274 | ||
275 | lower_header_len = max_t(unsigned short, lower_header_len, | |
276 | hard_iface->net_dev->hard_header_len); | |
277 | ||
278 | lower_headroom = max_t(unsigned short, lower_headroom, | |
279 | hard_iface->net_dev->needed_headroom); | |
280 | ||
281 | lower_tailroom = max_t(unsigned short, lower_tailroom, | |
282 | hard_iface->net_dev->needed_tailroom); | |
283 | } | |
284 | rcu_read_unlock(); | |
285 | ||
286 | needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); | |
287 | needed_headroom += batadv_max_header_len(); | |
288 | ||
289 | soft_iface->needed_headroom = needed_headroom; | |
290 | soft_iface->needed_tailroom = lower_tailroom; | |
291 | } | |
292 | ||
9563877e | 293 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 294 | { |
a19d3d85 | 295 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 296 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 297 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
298 | |
299 | rcu_read_lock(); | |
3193e8fd | 300 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
301 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
302 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
303 | continue; |
304 | ||
e6c10f43 | 305 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
306 | continue; |
307 | ||
a19d3d85 | 308 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
309 | } |
310 | rcu_read_unlock(); | |
a19d3d85 | 311 | |
a19d3d85 ML |
312 | if (atomic_read(&bat_priv->fragmentation) == 0) |
313 | goto out; | |
314 | ||
315 | /* with fragmentation enabled the maximum size of internally generated | |
316 | * packets such as translation table exchanges or tvlv containers, etc | |
317 | * has to be calculated | |
318 | */ | |
319 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
320 | min_mtu -= sizeof(struct batadv_frag_packet); | |
321 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 322 | |
c6c8fea2 | 323 | out: |
930cd6e4 AQ |
324 | /* report to the other components the maximum amount of bytes that |
325 | * batman-adv can send over the wire (without considering the payload | |
326 | * overhead). For example, this value is used by TT to compute the | |
327 | * maximum local table table size | |
328 | */ | |
329 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
330 | ||
331 | /* the real soft-interface MTU is computed by removing the payload | |
332 | * overhead from the maximum amount of bytes that was just computed. | |
333 | * | |
334 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
335 | */ | |
336 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
337 | } |
338 | ||
339 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 340 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 341 | { |
a19d3d85 | 342 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 343 | |
a19d3d85 ML |
344 | /* Check if the local translate table should be cleaned up to match a |
345 | * new (and smaller) MTU. | |
346 | */ | |
347 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
348 | } |
349 | ||
56303d34 SE |
350 | static void |
351 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 352 | { |
56303d34 SE |
353 | struct batadv_priv *bat_priv; |
354 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 355 | |
e9a4f295 | 356 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 357 | goto out; |
c6c8fea2 | 358 | |
e6c10f43 | 359 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 360 | |
c3229398 | 361 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 362 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 363 | |
9cfc7bd6 | 364 | /* the first active interface becomes our primary interface or |
015758d0 | 365 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 366 | */ |
e5d89254 | 367 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 368 | if (!primary_if) |
18a1cb6e | 369 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 370 | |
3e34819e SE |
371 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
372 | hard_iface->net_dev->name); | |
c6c8fea2 | 373 | |
9563877e | 374 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
375 | |
376 | out: | |
377 | if (primary_if) | |
e5d89254 | 378 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
379 | } |
380 | ||
56303d34 SE |
381 | static void |
382 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 383 | { |
e9a4f295 SE |
384 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
385 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
386 | return; |
387 | ||
e9a4f295 | 388 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 389 | |
3e34819e SE |
390 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
391 | hard_iface->net_dev->name); | |
c6c8fea2 | 392 | |
9563877e | 393 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
394 | } |
395 | ||
cb4b0d48 AQ |
396 | /** |
397 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
398 | * @slave: the interface enslaved in another master | |
399 | * @master: the master from which slave has to be removed | |
400 | * | |
401 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
402 | * is free'd and master can correctly change its internal state. | |
403 | * Return 0 on success, a negative value representing the error otherwise | |
404 | */ | |
405 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
406 | struct net_device *master) | |
407 | { | |
408 | int ret; | |
409 | ||
410 | if (!master) | |
411 | return 0; | |
412 | ||
413 | ret = -EBUSY; | |
414 | if (master->netdev_ops->ndo_del_slave) | |
415 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
56303d34 | 420 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 421 | const char *iface_name) |
c6c8fea2 | 422 | { |
56303d34 | 423 | struct batadv_priv *bat_priv; |
cb4b0d48 | 424 | struct net_device *soft_iface, *master; |
293e9338 | 425 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 426 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 427 | int ret; |
c6c8fea2 | 428 | |
e9a4f295 | 429 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
430 | goto out; |
431 | ||
e6c10f43 | 432 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
433 | goto out; |
434 | ||
e44d8fe2 | 435 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 436 | |
e44d8fe2 | 437 | if (!soft_iface) { |
04b482a2 | 438 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 439 | |
e44d8fe2 SE |
440 | if (!soft_iface) { |
441 | ret = -ENOMEM; | |
c6c8fea2 | 442 | goto err; |
e44d8fe2 | 443 | } |
c6c8fea2 SE |
444 | |
445 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
446 | dev_hold(soft_iface); |
447 | } | |
448 | ||
04b482a2 | 449 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 450 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 451 | soft_iface->name); |
e44d8fe2 | 452 | ret = -EINVAL; |
77af7575 | 453 | goto err_dev; |
c6c8fea2 SE |
454 | } |
455 | ||
cb4b0d48 AQ |
456 | /* check if the interface is enslaved in another virtual one and |
457 | * in that case unlink it first | |
458 | */ | |
459 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
460 | ret = batadv_master_del_slave(hard_iface, master); | |
461 | if (ret) | |
462 | goto err_dev; | |
463 | ||
e44d8fe2 | 464 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 465 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 466 | |
3dbd550b SE |
467 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, soft_iface); |
468 | if (ret) | |
469 | goto err_dev; | |
470 | ||
77af7575 | 471 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 472 | if (ret < 0) |
3dbd550b | 473 | goto err_upper; |
c6c8fea2 | 474 | |
e6c10f43 | 475 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 476 | bat_priv->num_ifaces++; |
e9a4f295 | 477 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
478 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
479 | if (ret < 0) { | |
480 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
481 | bat_priv->num_ifaces--; | |
482 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 483 | goto err_upper; |
62446307 | 484 | } |
c6c8fea2 | 485 | |
7e071c79 | 486 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 487 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
488 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
489 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 490 | |
3e34819e SE |
491 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
492 | hard_iface->net_dev->name); | |
c6c8fea2 | 493 | |
0aca2369 | 494 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 495 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 496 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 497 | "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 | 498 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 499 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 500 | |
0aca2369 | 501 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 502 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 503 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 504 | "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 | 505 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 506 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 507 | |
18a1cb6e SE |
508 | if (batadv_hardif_is_iface_up(hard_iface)) |
509 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 510 | else |
3e34819e SE |
511 | batadv_err(hard_iface->soft_iface, |
512 | "Not using interface %s (retrying later): interface not active\n", | |
513 | hard_iface->net_dev->name); | |
c6c8fea2 | 514 | |
7bca68c7 SE |
515 | batadv_hardif_recalc_extra_skbroom(soft_iface); |
516 | ||
c6c8fea2 | 517 | /* begin scheduling originator messages on that interface */ |
9455e34c | 518 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
519 | |
520 | out: | |
521 | return 0; | |
522 | ||
3dbd550b SE |
523 | err_upper: |
524 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 525 | err_dev: |
3dbd550b | 526 | hard_iface->soft_iface = NULL; |
77af7575 | 527 | dev_put(soft_iface); |
c6c8fea2 | 528 | err: |
e5d89254 | 529 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 530 | return ret; |
c6c8fea2 SE |
531 | } |
532 | ||
a15fd361 SE |
533 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
534 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 535 | { |
56303d34 SE |
536 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
537 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 538 | |
e9a4f295 | 539 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 540 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 541 | |
e9a4f295 | 542 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 543 | goto out; |
c6c8fea2 | 544 | |
3e34819e SE |
545 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
546 | hard_iface->net_dev->name); | |
e6c10f43 | 547 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
548 | |
549 | bat_priv->num_ifaces--; | |
7d211efc | 550 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 551 | |
e5d89254 | 552 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 553 | if (hard_iface == primary_if) { |
56303d34 | 554 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 555 | |
18a1cb6e SE |
556 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
557 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
558 | |
559 | if (new_if) | |
e5d89254 | 560 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
561 | } |
562 | ||
00a50076 | 563 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 564 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 565 | |
e6c10f43 | 566 | /* delete all references to this hard_iface */ |
7d211efc | 567 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 568 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 569 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 570 | |
a5256f7e | 571 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
7bca68c7 | 572 | batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
a5256f7e | 573 | |
c6c8fea2 | 574 | /* nobody uses this interface anymore */ |
8257f55a AQ |
575 | if (!bat_priv->num_ifaces) { |
576 | batadv_gw_check_client_stop(bat_priv); | |
577 | ||
578 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
579 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
580 | } | |
c6c8fea2 | 581 | |
e6c10f43 | 582 | hard_iface->soft_iface = NULL; |
e5d89254 | 583 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
584 | |
585 | out: | |
586 | if (primary_if) | |
e5d89254 | 587 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
588 | } |
589 | ||
5bc44dc8 SW |
590 | /** |
591 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
592 | * @work: work queue item | |
593 | * | |
594 | * Free the parts of the hard interface which can not be removed under | |
595 | * rtnl lock (to prevent deadlock situations). | |
596 | */ | |
597 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
598 | { | |
599 | struct batadv_hard_iface *hard_iface; | |
600 | ||
601 | hard_iface = container_of(work, struct batadv_hard_iface, | |
602 | cleanup_work); | |
603 | ||
5bc7c1eb | 604 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 SW |
605 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
606 | batadv_hardif_free_ref(hard_iface); | |
607 | } | |
608 | ||
56303d34 | 609 | static struct batadv_hard_iface * |
18a1cb6e | 610 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 611 | { |
56303d34 | 612 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
613 | int ret; |
614 | ||
c3caf519 SE |
615 | ASSERT_RTNL(); |
616 | ||
18a1cb6e | 617 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
618 | if (ret != 1) |
619 | goto out; | |
620 | ||
621 | dev_hold(net_dev); | |
622 | ||
7db3fc29 | 623 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 624 | if (!hard_iface) |
c6c8fea2 | 625 | goto release_dev; |
c6c8fea2 | 626 | |
5853e22c | 627 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
628 | if (ret) |
629 | goto free_if; | |
630 | ||
e6c10f43 ML |
631 | hard_iface->if_num = -1; |
632 | hard_iface->net_dev = net_dev; | |
633 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 634 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
635 | |
636 | ret = batadv_debugfs_add_hardif(hard_iface); | |
637 | if (ret) | |
638 | goto free_sysfs; | |
639 | ||
e6c10f43 | 640 | INIT_LIST_HEAD(&hard_iface->list); |
5bc44dc8 SW |
641 | INIT_WORK(&hard_iface->cleanup_work, |
642 | batadv_hardif_remove_interface_finish); | |
643 | ||
caf65bfc MS |
644 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
645 | if (batadv_is_wifi_netdev(net_dev)) | |
646 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
647 | ||
ed75ccbe | 648 | /* extra reference for return */ |
e6c10f43 | 649 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 650 | |
18a1cb6e | 651 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 652 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 653 | |
e6c10f43 | 654 | return hard_iface; |
c6c8fea2 | 655 | |
5bc7c1eb SW |
656 | free_sysfs: |
657 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 658 | free_if: |
e6c10f43 | 659 | kfree(hard_iface); |
c6c8fea2 SE |
660 | release_dev: |
661 | dev_put(net_dev); | |
662 | out: | |
663 | return NULL; | |
664 | } | |
665 | ||
56303d34 | 666 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 667 | { |
c3caf519 SE |
668 | ASSERT_RTNL(); |
669 | ||
c6c8fea2 | 670 | /* first deactivate interface */ |
e9a4f295 | 671 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
672 | batadv_hardif_disable_interface(hard_iface, |
673 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 674 | |
e9a4f295 | 675 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
676 | return; |
677 | ||
e9a4f295 | 678 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 679 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
680 | } |
681 | ||
9563877e | 682 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 683 | { |
56303d34 | 684 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 685 | |
c3caf519 | 686 | rtnl_lock(); |
e6c10f43 | 687 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 688 | &batadv_hardif_list, list) { |
e6c10f43 | 689 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 690 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
691 | } |
692 | rtnl_unlock(); | |
693 | } | |
694 | ||
18a1cb6e SE |
695 | static int batadv_hard_if_event(struct notifier_block *this, |
696 | unsigned long event, void *ptr) | |
c6c8fea2 | 697 | { |
351638e7 | 698 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
699 | struct batadv_hard_iface *hard_iface; |
700 | struct batadv_hard_iface *primary_if = NULL; | |
701 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 702 | |
37130293 SE |
703 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
704 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
705 | bat_priv = netdev_priv(net_dev); |
706 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
707 | return NOTIFY_DONE; |
708 | } | |
709 | ||
56303d34 | 710 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 711 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 712 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 713 | |
e6c10f43 | 714 | if (!hard_iface) |
c6c8fea2 SE |
715 | goto out; |
716 | ||
717 | switch (event) { | |
718 | case NETDEV_UP: | |
18a1cb6e | 719 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
720 | break; |
721 | case NETDEV_GOING_DOWN: | |
722 | case NETDEV_DOWN: | |
18a1cb6e | 723 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
724 | break; |
725 | case NETDEV_UNREGISTER: | |
e6c10f43 | 726 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 727 | |
18a1cb6e | 728 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
729 | break; |
730 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 731 | if (hard_iface->soft_iface) |
9563877e | 732 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
733 | break; |
734 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 735 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
736 | goto hardif_put; |
737 | ||
18a1cb6e | 738 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 739 | |
e6c10f43 | 740 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 741 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 742 | |
e5d89254 | 743 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
744 | if (!primary_if) |
745 | goto hardif_put; | |
746 | ||
747 | if (hard_iface == primary_if) | |
18a1cb6e | 748 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
749 | break; |
750 | default: | |
751 | break; | |
f81c6224 | 752 | } |
c6c8fea2 SE |
753 | |
754 | hardif_put: | |
e5d89254 | 755 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 756 | out: |
32ae9b22 | 757 | if (primary_if) |
e5d89254 | 758 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
759 | return NOTIFY_DONE; |
760 | } | |
761 | ||
9563877e | 762 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 763 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 764 | }; |