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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
785ea114 | 21 | #include "distributed-arp-table.h" |
c6c8fea2 SE |
22 | #include "hard-interface.h" |
23 | #include "soft-interface.h" | |
24 | #include "send.h" | |
25 | #include "translation-table.h" | |
26 | #include "routing.h" | |
b706b13b | 27 | #include "sysfs.h" |
c6c8fea2 SE |
28 | #include "originator.h" |
29 | #include "hash.h" | |
23721387 | 30 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
31 | |
32 | #include <linux/if_arp.h> | |
af5d4f77 | 33 | #include <linux/if_ether.h> |
c6c8fea2 | 34 | |
9563877e | 35 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 36 | { |
56303d34 | 37 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 38 | |
56303d34 | 39 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
40 | dev_put(hard_iface->net_dev); |
41 | kfree(hard_iface); | |
c6c8fea2 SE |
42 | } |
43 | ||
56303d34 SE |
44 | struct batadv_hard_iface * |
45 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 46 | { |
56303d34 | 47 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
48 | |
49 | rcu_read_lock(); | |
3193e8fd | 50 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
51 | if (hard_iface->net_dev == net_dev && |
52 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
53 | goto out; |
54 | } | |
55 | ||
e6c10f43 | 56 | hard_iface = NULL; |
c6c8fea2 SE |
57 | |
58 | out: | |
c6c8fea2 | 59 | rcu_read_unlock(); |
e6c10f43 | 60 | return hard_iface; |
c6c8fea2 SE |
61 | } |
62 | ||
b7eddd0b AQ |
63 | /** |
64 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
65 | * @net_dev: the device to check | |
66 | * | |
67 | * If the user creates any virtual device on top of a batman-adv interface, it | |
68 | * is important to prevent this new interface to be used to create a new mesh | |
69 | * network (this behaviour would lead to a batman-over-batman configuration). | |
70 | * This function recursively checks all the fathers of the device passed as | |
71 | * argument looking for a batman-adv soft interface. | |
72 | * | |
73 | * Returns true if the device is descendant of a batman-adv mesh interface (or | |
74 | * if it is a batman-adv interface itself), false otherwise | |
75 | */ | |
76 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
77 | { | |
78 | struct net_device *parent_dev; | |
79 | bool ret; | |
80 | ||
81 | /* check if this is a batman-adv mesh interface */ | |
82 | if (batadv_softif_is_valid(net_dev)) | |
83 | return true; | |
84 | ||
85 | /* no more parents..stop recursion */ | |
86 | if (net_dev->iflink == net_dev->ifindex) | |
87 | return false; | |
88 | ||
89 | /* recurse over the parent device */ | |
90 | parent_dev = dev_get_by_index(&init_net, net_dev->iflink); | |
91 | /* if we got a NULL parent_dev there is something broken.. */ | |
92 | if (WARN(!parent_dev, "Cannot find parent device")) | |
93 | return false; | |
94 | ||
95 | ret = batadv_is_on_batman_iface(parent_dev); | |
96 | ||
97 | if (parent_dev) | |
98 | dev_put(parent_dev); | |
99 | return ret; | |
100 | } | |
101 | ||
18a1cb6e | 102 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
103 | { |
104 | if (net_dev->flags & IFF_LOOPBACK) | |
105 | return 0; | |
106 | ||
107 | if (net_dev->type != ARPHRD_ETHER) | |
108 | return 0; | |
109 | ||
110 | if (net_dev->addr_len != ETH_ALEN) | |
111 | return 0; | |
112 | ||
113 | /* no batman over batman */ | |
b7eddd0b | 114 | if (batadv_is_on_batman_iface(net_dev)) |
c6c8fea2 | 115 | return 0; |
c6c8fea2 | 116 | |
c6c8fea2 SE |
117 | return 1; |
118 | } | |
119 | ||
56303d34 | 120 | static struct batadv_hard_iface * |
18a1cb6e | 121 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 122 | { |
56303d34 | 123 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
124 | |
125 | rcu_read_lock(); | |
3193e8fd | 126 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 127 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
128 | continue; |
129 | ||
e9a4f295 | 130 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 131 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
132 | goto out; |
133 | } | |
134 | ||
e6c10f43 | 135 | hard_iface = NULL; |
c6c8fea2 SE |
136 | |
137 | out: | |
c6c8fea2 | 138 | rcu_read_unlock(); |
e6c10f43 | 139 | return hard_iface; |
c6c8fea2 SE |
140 | } |
141 | ||
56303d34 SE |
142 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
143 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 144 | { |
96412690 | 145 | struct batadv_vis_packet *vis_packet; |
56303d34 | 146 | struct batadv_hard_iface *primary_if; |
807736f6 | 147 | struct sk_buff *skb; |
32ae9b22 | 148 | |
e5d89254 | 149 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
150 | if (!primary_if) |
151 | goto out; | |
c6c8fea2 | 152 | |
785ea114 AQ |
153 | batadv_dat_init_own_addr(bat_priv, primary_if); |
154 | ||
807736f6 SE |
155 | skb = bat_priv->vis.my_info->skb_packet; |
156 | vis_packet = (struct batadv_vis_packet *)skb->data; | |
32ae9b22 | 157 | memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 158 | memcpy(vis_packet->sender_orig, |
32ae9b22 ML |
159 | primary_if->net_dev->dev_addr, ETH_ALEN); |
160 | ||
08adf151 | 161 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
162 | out: |
163 | if (primary_if) | |
e5d89254 | 164 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
165 | } |
166 | ||
56303d34 SE |
167 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
168 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 169 | { |
56303d34 | 170 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 171 | |
c3caf519 | 172 | ASSERT_RTNL(); |
c6c8fea2 | 173 | |
32ae9b22 ML |
174 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
175 | new_hard_iface = NULL; | |
c6c8fea2 | 176 | |
728cbc6a | 177 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 178 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 179 | |
32ae9b22 | 180 | if (!new_hard_iface) |
23721387 | 181 | goto out; |
32ae9b22 | 182 | |
cd8b78e7 | 183 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 184 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
185 | |
186 | out: | |
187 | if (curr_hard_iface) | |
e5d89254 | 188 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
189 | } |
190 | ||
56303d34 SE |
191 | static bool |
192 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 193 | { |
e6c10f43 | 194 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
195 | return true; |
196 | ||
197 | return false; | |
198 | } | |
199 | ||
18a1cb6e | 200 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 201 | { |
56303d34 | 202 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
203 | |
204 | rcu_read_lock(); | |
3193e8fd | 205 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
206 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
207 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
208 | continue; |
209 | ||
e6c10f43 | 210 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
211 | continue; |
212 | ||
1eda58bf SE |
213 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
214 | net_dev->dev_addr)) | |
c6c8fea2 SE |
215 | continue; |
216 | ||
67969581 SE |
217 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
218 | net_dev->dev_addr, hard_iface->net_dev->name); | |
219 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
220 | } |
221 | rcu_read_unlock(); | |
222 | } | |
223 | ||
9563877e | 224 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 225 | { |
56303d34 SE |
226 | const struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
227 | const struct batadv_hard_iface *hard_iface; | |
c6c8fea2 | 228 | /* allow big frames if all devices are capable to do so |
9cfc7bd6 SE |
229 | * (have MTU > 1500 + BAT_HEADER_LEN) |
230 | */ | |
c6c8fea2 SE |
231 | int min_mtu = ETH_DATA_LEN; |
232 | ||
233 | if (atomic_read(&bat_priv->fragmentation)) | |
234 | goto out; | |
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->soft_iface != soft_iface) |
c6c8fea2 SE |
243 | continue; |
244 | ||
c11fdfae SE |
245 | min_mtu = min_t(int, |
246 | hard_iface->net_dev->mtu - BATADV_HEADER_LEN, | |
c6c8fea2 SE |
247 | min_mtu); |
248 | } | |
249 | rcu_read_unlock(); | |
250 | out: | |
251 | return min_mtu; | |
252 | } | |
253 | ||
254 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 255 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 SE |
256 | { |
257 | int min_mtu; | |
258 | ||
9563877e | 259 | min_mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 SE |
260 | if (soft_iface->mtu != min_mtu) |
261 | soft_iface->mtu = min_mtu; | |
262 | } | |
263 | ||
56303d34 SE |
264 | static void |
265 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 266 | { |
56303d34 SE |
267 | struct batadv_priv *bat_priv; |
268 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 269 | |
e9a4f295 | 270 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 271 | goto out; |
c6c8fea2 | 272 | |
e6c10f43 | 273 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 274 | |
c3229398 | 275 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 276 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 277 | |
9cfc7bd6 | 278 | /* the first active interface becomes our primary interface or |
015758d0 | 279 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 280 | */ |
e5d89254 | 281 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 282 | if (!primary_if) |
18a1cb6e | 283 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 284 | |
3e34819e SE |
285 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
286 | hard_iface->net_dev->name); | |
c6c8fea2 | 287 | |
9563877e | 288 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
289 | |
290 | out: | |
291 | if (primary_if) | |
e5d89254 | 292 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
293 | } |
294 | ||
56303d34 SE |
295 | static void |
296 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 297 | { |
e9a4f295 SE |
298 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
299 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
300 | return; |
301 | ||
e9a4f295 | 302 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 303 | |
3e34819e SE |
304 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
305 | hard_iface->net_dev->name); | |
c6c8fea2 | 306 | |
9563877e | 307 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
308 | } |
309 | ||
56303d34 | 310 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 311 | const char *iface_name) |
c6c8fea2 | 312 | { |
56303d34 | 313 | struct batadv_priv *bat_priv; |
e44d8fe2 | 314 | struct net_device *soft_iface; |
af5d4f77 | 315 | __be16 ethertype = __constant_htons(ETH_P_BATMAN); |
e44d8fe2 | 316 | int ret; |
c6c8fea2 | 317 | |
e9a4f295 | 318 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
319 | goto out; |
320 | ||
e6c10f43 | 321 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
322 | goto out; |
323 | ||
6e242f90 ML |
324 | /* hard-interface is part of a bridge */ |
325 | if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT) | |
86ceb360 | 326 | pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n", |
6e242f90 ML |
327 | hard_iface->net_dev->name); |
328 | ||
e44d8fe2 | 329 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 330 | |
e44d8fe2 | 331 | if (!soft_iface) { |
04b482a2 | 332 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 333 | |
e44d8fe2 SE |
334 | if (!soft_iface) { |
335 | ret = -ENOMEM; | |
c6c8fea2 | 336 | goto err; |
e44d8fe2 | 337 | } |
c6c8fea2 SE |
338 | |
339 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
340 | dev_hold(soft_iface); |
341 | } | |
342 | ||
04b482a2 | 343 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 344 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 345 | soft_iface->name); |
e44d8fe2 | 346 | ret = -EINVAL; |
77af7575 | 347 | goto err_dev; |
c6c8fea2 SE |
348 | } |
349 | ||
e44d8fe2 | 350 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 351 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 352 | |
77af7575 | 353 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 354 | if (ret < 0) |
77af7575 | 355 | goto err_dev; |
c6c8fea2 | 356 | |
e6c10f43 | 357 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 358 | bat_priv->num_ifaces++; |
e9a4f295 | 359 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
360 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
361 | if (ret < 0) { | |
362 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); | |
363 | bat_priv->num_ifaces--; | |
364 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
365 | goto err_dev; | |
366 | } | |
c6c8fea2 | 367 | |
7e071c79 | 368 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 369 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
370 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
371 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 372 | |
e6c10f43 | 373 | atomic_set(&hard_iface->frag_seqno, 1); |
3e34819e SE |
374 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
375 | hard_iface->net_dev->name); | |
c6c8fea2 | 376 | |
0aca2369 SE |
377 | if (atomic_read(&bat_priv->fragmentation) && |
378 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
379 | batadv_info(hard_iface->soft_iface, |
380 | "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 %zi would solve the problem.\n", | |
381 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 382 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 383 | |
0aca2369 SE |
384 | if (!atomic_read(&bat_priv->fragmentation) && |
385 | hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN) | |
3e34819e SE |
386 | batadv_info(hard_iface->soft_iface, |
387 | "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 %zi.\n", | |
388 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 389 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 390 | |
18a1cb6e SE |
391 | if (batadv_hardif_is_iface_up(hard_iface)) |
392 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 393 | else |
3e34819e SE |
394 | batadv_err(hard_iface->soft_iface, |
395 | "Not using interface %s (retrying later): interface not active\n", | |
396 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
397 | |
398 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 399 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
400 | |
401 | out: | |
402 | return 0; | |
403 | ||
77af7575 ML |
404 | err_dev: |
405 | dev_put(soft_iface); | |
c6c8fea2 | 406 | err: |
e5d89254 | 407 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 408 | return ret; |
c6c8fea2 SE |
409 | } |
410 | ||
56303d34 | 411 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 412 | { |
56303d34 SE |
413 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
414 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 415 | |
e9a4f295 | 416 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 417 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 418 | |
e9a4f295 | 419 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 420 | goto out; |
c6c8fea2 | 421 | |
3e34819e SE |
422 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
423 | hard_iface->net_dev->name); | |
e6c10f43 | 424 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
425 | |
426 | bat_priv->num_ifaces--; | |
7d211efc | 427 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 428 | |
e5d89254 | 429 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 430 | if (hard_iface == primary_if) { |
56303d34 | 431 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 432 | |
18a1cb6e SE |
433 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
434 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
435 | |
436 | if (new_if) | |
e5d89254 | 437 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
438 | } |
439 | ||
00a50076 | 440 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 441 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 442 | |
e6c10f43 | 443 | /* delete all references to this hard_iface */ |
7d211efc | 444 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 445 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 446 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
447 | |
448 | /* nobody uses this interface anymore */ | |
449 | if (!bat_priv->num_ifaces) | |
04b482a2 | 450 | batadv_softif_destroy(hard_iface->soft_iface); |
c6c8fea2 | 451 | |
e6c10f43 | 452 | hard_iface->soft_iface = NULL; |
e5d89254 | 453 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
454 | |
455 | out: | |
456 | if (primary_if) | |
e5d89254 | 457 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
458 | } |
459 | ||
56303d34 | 460 | static struct batadv_hard_iface * |
18a1cb6e | 461 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 462 | { |
56303d34 | 463 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
464 | int ret; |
465 | ||
c3caf519 SE |
466 | ASSERT_RTNL(); |
467 | ||
18a1cb6e | 468 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
469 | if (ret != 1) |
470 | goto out; | |
471 | ||
472 | dev_hold(net_dev); | |
473 | ||
704509b8 | 474 | hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 475 | if (!hard_iface) |
c6c8fea2 | 476 | goto release_dev; |
c6c8fea2 | 477 | |
5853e22c | 478 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
479 | if (ret) |
480 | goto free_if; | |
481 | ||
e6c10f43 ML |
482 | hard_iface->if_num = -1; |
483 | hard_iface->net_dev = net_dev; | |
484 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 485 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
e6c10f43 | 486 | INIT_LIST_HEAD(&hard_iface->list); |
ed75ccbe | 487 | /* extra reference for return */ |
e6c10f43 | 488 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 489 | |
18a1cb6e | 490 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 491 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 492 | |
9cfc7bd6 | 493 | /* This can't be called via a bat_priv callback because |
8140625e ML |
494 | * we have no bat_priv yet. |
495 | */ | |
14511519 ML |
496 | atomic_set(&hard_iface->bat_iv.ogm_seqno, 1); |
497 | hard_iface->bat_iv.ogm_buff = NULL; | |
8140625e | 498 | |
e6c10f43 | 499 | return hard_iface; |
c6c8fea2 SE |
500 | |
501 | free_if: | |
e6c10f43 | 502 | kfree(hard_iface); |
c6c8fea2 SE |
503 | release_dev: |
504 | dev_put(net_dev); | |
505 | out: | |
506 | return NULL; | |
507 | } | |
508 | ||
56303d34 | 509 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 510 | { |
c3caf519 SE |
511 | ASSERT_RTNL(); |
512 | ||
c6c8fea2 | 513 | /* first deactivate interface */ |
e9a4f295 | 514 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
9563877e | 515 | batadv_hardif_disable_interface(hard_iface); |
c6c8fea2 | 516 | |
e9a4f295 | 517 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
518 | return; |
519 | ||
e9a4f295 | 520 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5853e22c | 521 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
e5d89254 | 522 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 SE |
523 | } |
524 | ||
9563877e | 525 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 526 | { |
56303d34 | 527 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 528 | |
c3caf519 | 529 | rtnl_lock(); |
e6c10f43 | 530 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 531 | &batadv_hardif_list, list) { |
e6c10f43 | 532 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 533 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
534 | } |
535 | rtnl_unlock(); | |
536 | } | |
537 | ||
18a1cb6e SE |
538 | static int batadv_hard_if_event(struct notifier_block *this, |
539 | unsigned long event, void *ptr) | |
c6c8fea2 | 540 | { |
5f718c20 | 541 | struct net_device *net_dev = ptr; |
56303d34 SE |
542 | struct batadv_hard_iface *hard_iface; |
543 | struct batadv_hard_iface *primary_if = NULL; | |
544 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 545 | |
56303d34 | 546 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 547 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 548 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 549 | |
e6c10f43 | 550 | if (!hard_iface) |
c6c8fea2 SE |
551 | goto out; |
552 | ||
553 | switch (event) { | |
554 | case NETDEV_UP: | |
18a1cb6e | 555 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
556 | break; |
557 | case NETDEV_GOING_DOWN: | |
558 | case NETDEV_DOWN: | |
18a1cb6e | 559 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
560 | break; |
561 | case NETDEV_UNREGISTER: | |
e6c10f43 | 562 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 563 | |
18a1cb6e | 564 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
565 | break; |
566 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 567 | if (hard_iface->soft_iface) |
9563877e | 568 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
569 | break; |
570 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 571 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
572 | goto hardif_put; |
573 | ||
18a1cb6e | 574 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 575 | |
e6c10f43 | 576 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 577 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 578 | |
e5d89254 | 579 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
580 | if (!primary_if) |
581 | goto hardif_put; | |
582 | ||
583 | if (hard_iface == primary_if) | |
18a1cb6e | 584 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
585 | break; |
586 | default: | |
587 | break; | |
f81c6224 | 588 | } |
c6c8fea2 SE |
589 | |
590 | hardif_put: | |
e5d89254 | 591 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 592 | out: |
32ae9b22 | 593 | if (primary_if) |
e5d89254 | 594 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
595 | return NOTIFY_DONE; |
596 | } | |
597 | ||
bc279080 | 598 | /* This function returns true if the interface represented by ifindex is a |
9cfc7bd6 SE |
599 | * 802.11 wireless device |
600 | */ | |
9563877e | 601 | bool batadv_is_wifi_iface(int ifindex) |
bc279080 AQ |
602 | { |
603 | struct net_device *net_device = NULL; | |
604 | bool ret = false; | |
605 | ||
42d0b044 | 606 | if (ifindex == BATADV_NULL_IFINDEX) |
bc279080 AQ |
607 | goto out; |
608 | ||
609 | net_device = dev_get_by_index(&init_net, ifindex); | |
610 | if (!net_device) | |
611 | goto out; | |
612 | ||
613 | #ifdef CONFIG_WIRELESS_EXT | |
614 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
9cfc7bd6 SE |
615 | * check for wireless_handlers != NULL |
616 | */ | |
bc279080 AQ |
617 | if (net_device->wireless_handlers) |
618 | ret = true; | |
619 | else | |
620 | #endif | |
621 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
622 | if (net_device->ieee80211_ptr) | |
623 | ret = true; | |
624 | out: | |
625 | if (net_device) | |
626 | dev_put(net_device); | |
627 | return ret; | |
628 | } | |
629 | ||
9563877e | 630 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 631 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 632 | }; |