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0046b040 | 1 | /* Copyright (C) 2007-2016 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 | |
7a659d56 | 21 | #include <linux/atomic.h> |
1e2c2a4f SE |
22 | #include <linux/bug.h> |
23 | #include <linux/byteorder/generic.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/fs.h> | |
c6c8fea2 | 26 | #include <linux/if_arp.h> |
af5d4f77 | 27 | #include <linux/if_ether.h> |
1e2c2a4f SE |
28 | #include <linux/if.h> |
29 | #include <linux/kernel.h> | |
7a659d56 | 30 | #include <linux/kref.h> |
1e2c2a4f SE |
31 | #include <linux/list.h> |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/printk.h> | |
34 | #include <linux/rculist.h> | |
35 | #include <linux/rtnetlink.h> | |
36 | #include <linux/slab.h> | |
cef63419 | 37 | #include <linux/spinlock.h> |
1e2c2a4f SE |
38 | #include <linux/workqueue.h> |
39 | #include <net/net_namespace.h> | |
40 | ||
41 | #include "bridge_loop_avoidance.h" | |
42 | #include "debugfs.h" | |
43 | #include "distributed-arp-table.h" | |
44 | #include "gateway_client.h" | |
45 | #include "originator.h" | |
46 | #include "packet.h" | |
47 | #include "send.h" | |
48 | #include "soft-interface.h" | |
49 | #include "sysfs.h" | |
50 | #include "translation-table.h" | |
c6c8fea2 | 51 | |
140ed8e8 SE |
52 | /** |
53 | * batadv_hardif_release - release hard interface from lists and queue for | |
54 | * free after rcu grace period | |
7a659d56 | 55 | * @ref: kref pointer of the hard interface |
140ed8e8 | 56 | */ |
7a659d56 | 57 | void batadv_hardif_release(struct kref *ref) |
c6c8fea2 | 58 | { |
7a659d56 SE |
59 | struct batadv_hard_iface *hard_iface; |
60 | ||
61 | hard_iface = container_of(ref, struct batadv_hard_iface, refcount); | |
e6c10f43 | 62 | dev_put(hard_iface->net_dev); |
140ed8e8 SE |
63 | |
64 | kfree_rcu(hard_iface, rcu); | |
c6c8fea2 SE |
65 | } |
66 | ||
56303d34 SE |
67 | struct batadv_hard_iface * |
68 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 69 | { |
56303d34 | 70 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
71 | |
72 | rcu_read_lock(); | |
3193e8fd | 73 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 74 | if (hard_iface->net_dev == net_dev && |
7a659d56 | 75 | kref_get_unless_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
76 | goto out; |
77 | } | |
78 | ||
e6c10f43 | 79 | hard_iface = NULL; |
c6c8fea2 SE |
80 | |
81 | out: | |
c6c8fea2 | 82 | rcu_read_unlock(); |
e6c10f43 | 83 | return hard_iface; |
c6c8fea2 SE |
84 | } |
85 | ||
1bc4e2b0 AL |
86 | /** |
87 | * batadv_mutual_parents - check if two devices are each others parent | |
88 | * @dev1: 1st net_device | |
89 | * @dev2: 2nd net_device | |
90 | * | |
91 | * veth devices come in pairs and each is the parent of the other! | |
92 | * | |
93 | * Return: true if the devices are each others parent, otherwise false | |
94 | */ | |
95 | static bool batadv_mutual_parents(const struct net_device *dev1, | |
96 | const struct net_device *dev2) | |
97 | { | |
98 | int dev1_parent_iflink = dev_get_iflink(dev1); | |
99 | int dev2_parent_iflink = dev_get_iflink(dev2); | |
100 | ||
101 | if (!dev1_parent_iflink || !dev2_parent_iflink) | |
102 | return false; | |
103 | ||
104 | return (dev1_parent_iflink == dev2->ifindex) && | |
105 | (dev2_parent_iflink == dev1->ifindex); | |
106 | } | |
107 | ||
b7eddd0b AQ |
108 | /** |
109 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
110 | * @net_dev: the device to check | |
111 | * | |
112 | * If the user creates any virtual device on top of a batman-adv interface, it | |
113 | * is important to prevent this new interface to be used to create a new mesh | |
114 | * network (this behaviour would lead to a batman-over-batman configuration). | |
115 | * This function recursively checks all the fathers of the device passed as | |
116 | * argument looking for a batman-adv soft interface. | |
117 | * | |
62fe710f | 118 | * Return: true if the device is descendant of a batman-adv mesh interface (or |
b7eddd0b AQ |
119 | * if it is a batman-adv interface itself), false otherwise |
120 | */ | |
121 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
122 | { | |
123 | struct net_device *parent_dev; | |
124 | bool ret; | |
125 | ||
126 | /* check if this is a batman-adv mesh interface */ | |
127 | if (batadv_softif_is_valid(net_dev)) | |
128 | return true; | |
129 | ||
130 | /* no more parents..stop recursion */ | |
a54acb3a ND |
131 | if (dev_get_iflink(net_dev) == 0 || |
132 | dev_get_iflink(net_dev) == net_dev->ifindex) | |
b7eddd0b AQ |
133 | return false; |
134 | ||
135 | /* recurse over the parent device */ | |
a54acb3a | 136 | parent_dev = __dev_get_by_index(&init_net, dev_get_iflink(net_dev)); |
b7eddd0b AQ |
137 | /* if we got a NULL parent_dev there is something broken.. */ |
138 | if (WARN(!parent_dev, "Cannot find parent device")) | |
139 | return false; | |
140 | ||
1bc4e2b0 AL |
141 | if (batadv_mutual_parents(net_dev, parent_dev)) |
142 | return false; | |
143 | ||
b7eddd0b AQ |
144 | ret = batadv_is_on_batman_iface(parent_dev); |
145 | ||
b7eddd0b AQ |
146 | return ret; |
147 | } | |
148 | ||
18a1cb6e | 149 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
150 | { |
151 | if (net_dev->flags & IFF_LOOPBACK) | |
152 | return 0; | |
153 | ||
154 | if (net_dev->type != ARPHRD_ETHER) | |
155 | return 0; | |
156 | ||
157 | if (net_dev->addr_len != ETH_ALEN) | |
158 | return 0; | |
159 | ||
160 | /* no batman over batman */ | |
b7eddd0b | 161 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 162 | return 0; |
c6c8fea2 | 163 | |
c6c8fea2 SE |
164 | return 1; |
165 | } | |
166 | ||
de68d100 MS |
167 | /** |
168 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
169 | * interface | |
170 | * @net_device: the device to check | |
171 | * | |
62fe710f | 172 | * Return: true if the net device is a 802.11 wireless device, false otherwise. |
de68d100 | 173 | */ |
0c69aecc | 174 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 175 | { |
0c69aecc AQ |
176 | if (!net_device) |
177 | return false; | |
178 | ||
de68d100 MS |
179 | #ifdef CONFIG_WIRELESS_EXT |
180 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
181 | * check for wireless_handlers != NULL | |
182 | */ | |
183 | if (net_device->wireless_handlers) | |
184 | return true; | |
185 | #endif | |
186 | ||
187 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
188 | if (net_device->ieee80211_ptr) | |
189 | return true; | |
190 | ||
191 | return false; | |
192 | } | |
193 | ||
56303d34 | 194 | static struct batadv_hard_iface * |
18a1cb6e | 195 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 196 | { |
56303d34 | 197 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
198 | |
199 | rcu_read_lock(); | |
3193e8fd | 200 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 201 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
202 | continue; |
203 | ||
e9a4f295 | 204 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
7a659d56 | 205 | kref_get_unless_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
206 | goto out; |
207 | } | |
208 | ||
e6c10f43 | 209 | hard_iface = NULL; |
c6c8fea2 SE |
210 | |
211 | out: | |
c6c8fea2 | 212 | rcu_read_unlock(); |
e6c10f43 | 213 | return hard_iface; |
c6c8fea2 SE |
214 | } |
215 | ||
56303d34 SE |
216 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
217 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 218 | { |
56303d34 | 219 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 220 | |
e5d89254 | 221 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
222 | if (!primary_if) |
223 | goto out; | |
c6c8fea2 | 224 | |
785ea114 | 225 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 226 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
227 | out: |
228 | if (primary_if) | |
82047ad7 | 229 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
230 | } |
231 | ||
56303d34 SE |
232 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
233 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 234 | { |
56303d34 | 235 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 236 | |
c3caf519 | 237 | ASSERT_RTNL(); |
c6c8fea2 | 238 | |
7a659d56 | 239 | if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount)) |
32ae9b22 | 240 | new_hard_iface = NULL; |
c6c8fea2 | 241 | |
728cbc6a | 242 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 243 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 244 | |
32ae9b22 | 245 | if (!new_hard_iface) |
23721387 | 246 | goto out; |
32ae9b22 | 247 | |
cd8b78e7 | 248 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 249 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
250 | |
251 | out: | |
252 | if (curr_hard_iface) | |
82047ad7 | 253 | batadv_hardif_put(curr_hard_iface); |
c6c8fea2 SE |
254 | } |
255 | ||
56303d34 SE |
256 | static bool |
257 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 258 | { |
e6c10f43 | 259 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
260 | return true; |
261 | ||
262 | return false; | |
263 | } | |
264 | ||
18a1cb6e | 265 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 266 | { |
56303d34 | 267 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
268 | |
269 | rcu_read_lock(); | |
3193e8fd | 270 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
271 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
272 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
273 | continue; |
274 | ||
e6c10f43 | 275 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
276 | continue; |
277 | ||
1eda58bf SE |
278 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
279 | net_dev->dev_addr)) | |
c6c8fea2 SE |
280 | continue; |
281 | ||
67969581 SE |
282 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
283 | net_dev->dev_addr, hard_iface->net_dev->name); | |
284 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
285 | } |
286 | rcu_read_unlock(); | |
287 | } | |
288 | ||
7bca68c7 SE |
289 | /** |
290 | * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom | |
291 | * @soft_iface: netdev struct of the mesh interface | |
292 | */ | |
293 | static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) | |
294 | { | |
295 | const struct batadv_hard_iface *hard_iface; | |
296 | unsigned short lower_header_len = ETH_HLEN; | |
297 | unsigned short lower_headroom = 0; | |
298 | unsigned short lower_tailroom = 0; | |
299 | unsigned short needed_headroom; | |
300 | ||
301 | rcu_read_lock(); | |
302 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
303 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) | |
304 | continue; | |
305 | ||
306 | if (hard_iface->soft_iface != soft_iface) | |
307 | continue; | |
308 | ||
309 | lower_header_len = max_t(unsigned short, lower_header_len, | |
310 | hard_iface->net_dev->hard_header_len); | |
311 | ||
312 | lower_headroom = max_t(unsigned short, lower_headroom, | |
313 | hard_iface->net_dev->needed_headroom); | |
314 | ||
315 | lower_tailroom = max_t(unsigned short, lower_tailroom, | |
316 | hard_iface->net_dev->needed_tailroom); | |
317 | } | |
318 | rcu_read_unlock(); | |
319 | ||
320 | needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); | |
321 | needed_headroom += batadv_max_header_len(); | |
322 | ||
323 | soft_iface->needed_headroom = needed_headroom; | |
324 | soft_iface->needed_tailroom = lower_tailroom; | |
325 | } | |
326 | ||
9563877e | 327 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 328 | { |
a19d3d85 | 329 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 330 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 331 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
332 | |
333 | rcu_read_lock(); | |
3193e8fd | 334 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
335 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
336 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
337 | continue; |
338 | ||
e6c10f43 | 339 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
340 | continue; |
341 | ||
a19d3d85 | 342 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
343 | } |
344 | rcu_read_unlock(); | |
a19d3d85 | 345 | |
a19d3d85 ML |
346 | if (atomic_read(&bat_priv->fragmentation) == 0) |
347 | goto out; | |
348 | ||
349 | /* with fragmentation enabled the maximum size of internally generated | |
350 | * packets such as translation table exchanges or tvlv containers, etc | |
351 | * has to be calculated | |
352 | */ | |
353 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
354 | min_mtu -= sizeof(struct batadv_frag_packet); | |
355 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 356 | |
c6c8fea2 | 357 | out: |
930cd6e4 AQ |
358 | /* report to the other components the maximum amount of bytes that |
359 | * batman-adv can send over the wire (without considering the payload | |
360 | * overhead). For example, this value is used by TT to compute the | |
361 | * maximum local table table size | |
362 | */ | |
363 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
364 | ||
365 | /* the real soft-interface MTU is computed by removing the payload | |
366 | * overhead from the maximum amount of bytes that was just computed. | |
367 | * | |
368 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
369 | */ | |
370 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
371 | } |
372 | ||
373 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 374 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 375 | { |
a19d3d85 | 376 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 377 | |
a19d3d85 ML |
378 | /* Check if the local translate table should be cleaned up to match a |
379 | * new (and smaller) MTU. | |
380 | */ | |
381 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
382 | } |
383 | ||
56303d34 SE |
384 | static void |
385 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 386 | { |
56303d34 SE |
387 | struct batadv_priv *bat_priv; |
388 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 389 | |
e9a4f295 | 390 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 391 | goto out; |
c6c8fea2 | 392 | |
e6c10f43 | 393 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 394 | |
c3229398 | 395 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 396 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 397 | |
9cfc7bd6 | 398 | /* the first active interface becomes our primary interface or |
015758d0 | 399 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 400 | */ |
e5d89254 | 401 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 402 | if (!primary_if) |
18a1cb6e | 403 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 404 | |
3e34819e SE |
405 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
406 | hard_iface->net_dev->name); | |
c6c8fea2 | 407 | |
9563877e | 408 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
409 | |
410 | out: | |
411 | if (primary_if) | |
82047ad7 | 412 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
413 | } |
414 | ||
56303d34 SE |
415 | static void |
416 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 417 | { |
e9a4f295 SE |
418 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
419 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
420 | return; |
421 | ||
e9a4f295 | 422 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 423 | |
3e34819e SE |
424 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
425 | hard_iface->net_dev->name); | |
c6c8fea2 | 426 | |
9563877e | 427 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
428 | } |
429 | ||
cb4b0d48 AQ |
430 | /** |
431 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
432 | * @slave: the interface enslaved in another master | |
433 | * @master: the master from which slave has to be removed | |
434 | * | |
435 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
436 | * is free'd and master can correctly change its internal state. | |
62fe710f SE |
437 | * |
438 | * Return: 0 on success, a negative value representing the error otherwise | |
cb4b0d48 AQ |
439 | */ |
440 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
441 | struct net_device *master) | |
442 | { | |
443 | int ret; | |
444 | ||
445 | if (!master) | |
446 | return 0; | |
447 | ||
448 | ret = -EBUSY; | |
449 | if (master->netdev_ops->ndo_del_slave) | |
450 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
56303d34 | 455 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 456 | const char *iface_name) |
c6c8fea2 | 457 | { |
56303d34 | 458 | struct batadv_priv *bat_priv; |
cb4b0d48 | 459 | struct net_device *soft_iface, *master; |
293e9338 | 460 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 461 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 462 | int ret; |
c6c8fea2 | 463 | |
e9a4f295 | 464 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
465 | goto out; |
466 | ||
7a659d56 | 467 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
ed75ccbe ML |
468 | goto out; |
469 | ||
e44d8fe2 | 470 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 471 | |
e44d8fe2 | 472 | if (!soft_iface) { |
04b482a2 | 473 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 474 | |
e44d8fe2 SE |
475 | if (!soft_iface) { |
476 | ret = -ENOMEM; | |
c6c8fea2 | 477 | goto err; |
e44d8fe2 | 478 | } |
c6c8fea2 SE |
479 | |
480 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
481 | dev_hold(soft_iface); |
482 | } | |
483 | ||
04b482a2 | 484 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 485 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 486 | soft_iface->name); |
e44d8fe2 | 487 | ret = -EINVAL; |
77af7575 | 488 | goto err_dev; |
c6c8fea2 SE |
489 | } |
490 | ||
cb4b0d48 AQ |
491 | /* check if the interface is enslaved in another virtual one and |
492 | * in that case unlink it first | |
493 | */ | |
494 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
495 | ret = batadv_master_del_slave(hard_iface, master); | |
496 | if (ret) | |
497 | goto err_dev; | |
498 | ||
e44d8fe2 | 499 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 500 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 501 | |
6dffb044 | 502 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, |
29bf24af | 503 | soft_iface, NULL, NULL); |
3dbd550b SE |
504 | if (ret) |
505 | goto err_dev; | |
506 | ||
77af7575 | 507 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 508 | if (ret < 0) |
3dbd550b | 509 | goto err_upper; |
c6c8fea2 | 510 | |
e6c10f43 | 511 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 512 | bat_priv->num_ifaces++; |
e9a4f295 | 513 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
514 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
515 | if (ret < 0) { | |
516 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
517 | bat_priv->num_ifaces--; | |
518 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 519 | goto err_upper; |
62446307 | 520 | } |
c6c8fea2 | 521 | |
7e071c79 | 522 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 523 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
524 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
525 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 526 | |
3e34819e SE |
527 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
528 | hard_iface->net_dev->name); | |
c6c8fea2 | 529 | |
0aca2369 | 530 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 531 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 532 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 533 | "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 | 534 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 535 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 536 | |
0aca2369 | 537 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 538 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 539 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 540 | "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 | 541 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 542 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 543 | |
18a1cb6e SE |
544 | if (batadv_hardif_is_iface_up(hard_iface)) |
545 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 546 | else |
3e34819e SE |
547 | batadv_err(hard_iface->soft_iface, |
548 | "Not using interface %s (retrying later): interface not active\n", | |
549 | hard_iface->net_dev->name); | |
c6c8fea2 | 550 | |
7bca68c7 SE |
551 | batadv_hardif_recalc_extra_skbroom(soft_iface); |
552 | ||
c6c8fea2 | 553 | /* begin scheduling originator messages on that interface */ |
9455e34c | 554 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
555 | |
556 | out: | |
557 | return 0; | |
558 | ||
3dbd550b SE |
559 | err_upper: |
560 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 561 | err_dev: |
3dbd550b | 562 | hard_iface->soft_iface = NULL; |
77af7575 | 563 | dev_put(soft_iface); |
c6c8fea2 | 564 | err: |
82047ad7 | 565 | batadv_hardif_put(hard_iface); |
e44d8fe2 | 566 | return ret; |
c6c8fea2 SE |
567 | } |
568 | ||
a15fd361 SE |
569 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
570 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 571 | { |
56303d34 SE |
572 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
573 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 574 | |
f2d23861 | 575 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 576 | |
e9a4f295 | 577 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 578 | goto out; |
c6c8fea2 | 579 | |
3e34819e SE |
580 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
581 | hard_iface->net_dev->name); | |
e6c10f43 | 582 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
583 | |
584 | bat_priv->num_ifaces--; | |
7d211efc | 585 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 586 | |
e5d89254 | 587 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 588 | if (hard_iface == primary_if) { |
56303d34 | 589 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 590 | |
18a1cb6e SE |
591 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
592 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
593 | |
594 | if (new_if) | |
82047ad7 | 595 | batadv_hardif_put(new_if); |
c6c8fea2 SE |
596 | } |
597 | ||
00a50076 | 598 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 599 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 600 | |
e6c10f43 | 601 | /* delete all references to this hard_iface */ |
7d211efc | 602 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 603 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 604 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 605 | |
a5256f7e | 606 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
7bca68c7 | 607 | batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
a5256f7e | 608 | |
c6c8fea2 | 609 | /* nobody uses this interface anymore */ |
8257f55a AQ |
610 | if (!bat_priv->num_ifaces) { |
611 | batadv_gw_check_client_stop(bat_priv); | |
612 | ||
613 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
614 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
615 | } | |
c6c8fea2 | 616 | |
e6c10f43 | 617 | hard_iface->soft_iface = NULL; |
82047ad7 | 618 | batadv_hardif_put(hard_iface); |
32ae9b22 ML |
619 | |
620 | out: | |
621 | if (primary_if) | |
82047ad7 | 622 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
623 | } |
624 | ||
5bc44dc8 SW |
625 | /** |
626 | * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif | |
627 | * @work: work queue item | |
628 | * | |
629 | * Free the parts of the hard interface which can not be removed under | |
630 | * rtnl lock (to prevent deadlock situations). | |
631 | */ | |
632 | static void batadv_hardif_remove_interface_finish(struct work_struct *work) | |
633 | { | |
634 | struct batadv_hard_iface *hard_iface; | |
635 | ||
636 | hard_iface = container_of(work, struct batadv_hard_iface, | |
637 | cleanup_work); | |
638 | ||
5bc7c1eb | 639 | batadv_debugfs_del_hardif(hard_iface); |
5bc44dc8 | 640 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
82047ad7 | 641 | batadv_hardif_put(hard_iface); |
5bc44dc8 SW |
642 | } |
643 | ||
56303d34 | 644 | static struct batadv_hard_iface * |
18a1cb6e | 645 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 646 | { |
56303d34 | 647 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
648 | int ret; |
649 | ||
c3caf519 SE |
650 | ASSERT_RTNL(); |
651 | ||
18a1cb6e | 652 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
653 | if (ret != 1) |
654 | goto out; | |
655 | ||
656 | dev_hold(net_dev); | |
657 | ||
7db3fc29 | 658 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 659 | if (!hard_iface) |
c6c8fea2 | 660 | goto release_dev; |
c6c8fea2 | 661 | |
5853e22c | 662 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
663 | if (ret) |
664 | goto free_if; | |
665 | ||
e6c10f43 ML |
666 | hard_iface->if_num = -1; |
667 | hard_iface->net_dev = net_dev; | |
668 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 669 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
670 | |
671 | ret = batadv_debugfs_add_hardif(hard_iface); | |
672 | if (ret) | |
673 | goto free_sysfs; | |
674 | ||
e6c10f43 | 675 | INIT_LIST_HEAD(&hard_iface->list); |
cef63419 | 676 | INIT_HLIST_HEAD(&hard_iface->neigh_list); |
5bc44dc8 SW |
677 | INIT_WORK(&hard_iface->cleanup_work, |
678 | batadv_hardif_remove_interface_finish); | |
679 | ||
cef63419 ML |
680 | spin_lock_init(&hard_iface->neigh_list_lock); |
681 | ||
caf65bfc MS |
682 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
683 | if (batadv_is_wifi_netdev(net_dev)) | |
684 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
685 | ||
ed75ccbe | 686 | /* extra reference for return */ |
7a659d56 SE |
687 | kref_init(&hard_iface->refcount); |
688 | kref_get(&hard_iface->refcount); | |
c6c8fea2 | 689 | |
18a1cb6e | 690 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 691 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 692 | |
e6c10f43 | 693 | return hard_iface; |
c6c8fea2 | 694 | |
5bc7c1eb SW |
695 | free_sysfs: |
696 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 697 | free_if: |
e6c10f43 | 698 | kfree(hard_iface); |
c6c8fea2 SE |
699 | release_dev: |
700 | dev_put(net_dev); | |
701 | out: | |
702 | return NULL; | |
703 | } | |
704 | ||
56303d34 | 705 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 706 | { |
c3caf519 SE |
707 | ASSERT_RTNL(); |
708 | ||
c6c8fea2 | 709 | /* first deactivate interface */ |
e9a4f295 | 710 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 SE |
711 | batadv_hardif_disable_interface(hard_iface, |
712 | BATADV_IF_CLEANUP_AUTO); | |
c6c8fea2 | 713 | |
e9a4f295 | 714 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
715 | return; |
716 | ||
e9a4f295 | 717 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5bc44dc8 | 718 | queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); |
c6c8fea2 SE |
719 | } |
720 | ||
9563877e | 721 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 722 | { |
56303d34 | 723 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 724 | |
c3caf519 | 725 | rtnl_lock(); |
e6c10f43 | 726 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 727 | &batadv_hardif_list, list) { |
e6c10f43 | 728 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 729 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
730 | } |
731 | rtnl_unlock(); | |
732 | } | |
733 | ||
18a1cb6e SE |
734 | static int batadv_hard_if_event(struct notifier_block *this, |
735 | unsigned long event, void *ptr) | |
c6c8fea2 | 736 | { |
351638e7 | 737 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
738 | struct batadv_hard_iface *hard_iface; |
739 | struct batadv_hard_iface *primary_if = NULL; | |
740 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 741 | |
37130293 SE |
742 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
743 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
744 | bat_priv = netdev_priv(net_dev); |
745 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
746 | return NOTIFY_DONE; |
747 | } | |
748 | ||
56303d34 | 749 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
a1a66b11 AL |
750 | if (!hard_iface && (event == NETDEV_REGISTER || |
751 | event == NETDEV_POST_TYPE_CHANGE)) | |
18a1cb6e | 752 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 753 | |
e6c10f43 | 754 | if (!hard_iface) |
c6c8fea2 SE |
755 | goto out; |
756 | ||
757 | switch (event) { | |
758 | case NETDEV_UP: | |
18a1cb6e | 759 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
760 | break; |
761 | case NETDEV_GOING_DOWN: | |
762 | case NETDEV_DOWN: | |
18a1cb6e | 763 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
764 | break; |
765 | case NETDEV_UNREGISTER: | |
a1a66b11 | 766 | case NETDEV_PRE_TYPE_CHANGE: |
e6c10f43 | 767 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 768 | |
18a1cb6e | 769 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
770 | break; |
771 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 772 | if (hard_iface->soft_iface) |
9563877e | 773 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
774 | break; |
775 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 776 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
777 | goto hardif_put; |
778 | ||
18a1cb6e | 779 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 780 | |
e6c10f43 | 781 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 782 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 783 | |
e5d89254 | 784 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
785 | if (!primary_if) |
786 | goto hardif_put; | |
787 | ||
788 | if (hard_iface == primary_if) | |
18a1cb6e | 789 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
790 | break; |
791 | default: | |
792 | break; | |
f81c6224 | 793 | } |
c6c8fea2 SE |
794 | |
795 | hardif_put: | |
82047ad7 | 796 | batadv_hardif_put(hard_iface); |
c6c8fea2 | 797 | out: |
32ae9b22 | 798 | if (primary_if) |
82047ad7 | 799 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
800 | return NOTIFY_DONE; |
801 | } | |
802 | ||
9563877e | 803 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 804 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 805 | }; |