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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" | |
21 | #include "hard-interface.h" | |
22 | #include "soft-interface.h" | |
23 | #include "send.h" | |
24 | #include "translation-table.h" | |
25 | #include "routing.h" | |
26 | #include "bat_sysfs.h" | |
27 | #include "originator.h" | |
28 | #include "hash.h" | |
23721387 | 29 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
30 | |
31 | #include <linux/if_arp.h> | |
32 | ||
9563877e | 33 | void batadv_hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 34 | { |
56303d34 | 35 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 | 36 | |
56303d34 | 37 | hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); |
e6c10f43 ML |
38 | dev_put(hard_iface->net_dev); |
39 | kfree(hard_iface); | |
c6c8fea2 SE |
40 | } |
41 | ||
56303d34 SE |
42 | struct batadv_hard_iface * |
43 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 44 | { |
56303d34 | 45 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
46 | |
47 | rcu_read_lock(); | |
3193e8fd | 48 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 ML |
49 | if (hard_iface->net_dev == net_dev && |
50 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
51 | goto out; |
52 | } | |
53 | ||
e6c10f43 | 54 | hard_iface = NULL; |
c6c8fea2 SE |
55 | |
56 | out: | |
c6c8fea2 | 57 | rcu_read_unlock(); |
e6c10f43 | 58 | return hard_iface; |
c6c8fea2 SE |
59 | } |
60 | ||
18a1cb6e | 61 | static int batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
62 | { |
63 | if (net_dev->flags & IFF_LOOPBACK) | |
64 | return 0; | |
65 | ||
66 | if (net_dev->type != ARPHRD_ETHER) | |
67 | return 0; | |
68 | ||
69 | if (net_dev->addr_len != ETH_ALEN) | |
70 | return 0; | |
71 | ||
72 | /* no batman over batman */ | |
04b482a2 | 73 | if (batadv_softif_is_valid(net_dev)) |
c6c8fea2 | 74 | return 0; |
c6c8fea2 | 75 | |
c6c8fea2 SE |
76 | return 1; |
77 | } | |
78 | ||
56303d34 | 79 | static struct batadv_hard_iface * |
18a1cb6e | 80 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 81 | { |
56303d34 | 82 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
83 | |
84 | rcu_read_lock(); | |
3193e8fd | 85 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 86 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
87 | continue; |
88 | ||
e9a4f295 | 89 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
e6c10f43 | 90 | atomic_inc_not_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
91 | goto out; |
92 | } | |
93 | ||
e6c10f43 | 94 | hard_iface = NULL; |
c6c8fea2 SE |
95 | |
96 | out: | |
c6c8fea2 | 97 | rcu_read_unlock(); |
e6c10f43 | 98 | return hard_iface; |
c6c8fea2 SE |
99 | } |
100 | ||
56303d34 SE |
101 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
102 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 103 | { |
96412690 | 104 | struct batadv_vis_packet *vis_packet; |
56303d34 | 105 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 106 | |
e5d89254 | 107 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
108 | if (!primary_if) |
109 | goto out; | |
c6c8fea2 | 110 | |
96412690 | 111 | vis_packet = (struct batadv_vis_packet *) |
c6c8fea2 | 112 | bat_priv->my_vis_info->skb_packet->data; |
32ae9b22 | 113 | memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 114 | memcpy(vis_packet->sender_orig, |
32ae9b22 ML |
115 | primary_if->net_dev->dev_addr, ETH_ALEN); |
116 | ||
08adf151 | 117 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
118 | out: |
119 | if (primary_if) | |
e5d89254 | 120 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
121 | } |
122 | ||
56303d34 SE |
123 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
124 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 125 | { |
56303d34 | 126 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 127 | |
c3caf519 | 128 | ASSERT_RTNL(); |
c6c8fea2 | 129 | |
32ae9b22 ML |
130 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
131 | new_hard_iface = NULL; | |
c6c8fea2 | 132 | |
728cbc6a | 133 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 134 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 135 | |
32ae9b22 | 136 | if (!new_hard_iface) |
23721387 | 137 | goto out; |
32ae9b22 | 138 | |
cd8b78e7 | 139 | bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface); |
18a1cb6e | 140 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
141 | |
142 | out: | |
143 | if (curr_hard_iface) | |
e5d89254 | 144 | batadv_hardif_free_ref(curr_hard_iface); |
c6c8fea2 SE |
145 | } |
146 | ||
56303d34 SE |
147 | static bool |
148 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 149 | { |
e6c10f43 | 150 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
151 | return true; |
152 | ||
153 | return false; | |
154 | } | |
155 | ||
18a1cb6e | 156 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 157 | { |
56303d34 | 158 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
159 | |
160 | rcu_read_lock(); | |
3193e8fd | 161 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
162 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
163 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
164 | continue; |
165 | ||
e6c10f43 | 166 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
167 | continue; |
168 | ||
1eda58bf SE |
169 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
170 | net_dev->dev_addr)) | |
c6c8fea2 SE |
171 | continue; |
172 | ||
67969581 SE |
173 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
174 | net_dev->dev_addr, hard_iface->net_dev->name); | |
175 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
176 | } |
177 | rcu_read_unlock(); | |
178 | } | |
179 | ||
9563877e | 180 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 181 | { |
56303d34 SE |
182 | const struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
183 | const struct batadv_hard_iface *hard_iface; | |
c6c8fea2 | 184 | /* allow big frames if all devices are capable to do so |
9cfc7bd6 SE |
185 | * (have MTU > 1500 + BAT_HEADER_LEN) |
186 | */ | |
c6c8fea2 SE |
187 | int min_mtu = ETH_DATA_LEN; |
188 | ||
189 | if (atomic_read(&bat_priv->fragmentation)) | |
190 | goto out; | |
191 | ||
192 | rcu_read_lock(); | |
3193e8fd | 193 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
194 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
195 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
196 | continue; |
197 | ||
e6c10f43 | 198 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
199 | continue; |
200 | ||
c11fdfae SE |
201 | min_mtu = min_t(int, |
202 | hard_iface->net_dev->mtu - BATADV_HEADER_LEN, | |
c6c8fea2 SE |
203 | min_mtu); |
204 | } | |
205 | rcu_read_unlock(); | |
206 | out: | |
207 | return min_mtu; | |
208 | } | |
209 | ||
210 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 211 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 SE |
212 | { |
213 | int min_mtu; | |
214 | ||
9563877e | 215 | min_mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 SE |
216 | if (soft_iface->mtu != min_mtu) |
217 | soft_iface->mtu = min_mtu; | |
218 | } | |
219 | ||
56303d34 SE |
220 | static void |
221 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 222 | { |
56303d34 SE |
223 | struct batadv_priv *bat_priv; |
224 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 225 | |
e9a4f295 | 226 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 227 | goto out; |
c6c8fea2 | 228 | |
e6c10f43 | 229 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 230 | |
c3229398 | 231 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
e9a4f295 | 232 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 233 | |
9cfc7bd6 | 234 | /* the first active interface becomes our primary interface or |
015758d0 | 235 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 236 | */ |
e5d89254 | 237 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 238 | if (!primary_if) |
18a1cb6e | 239 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 240 | |
3e34819e SE |
241 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
242 | hard_iface->net_dev->name); | |
c6c8fea2 | 243 | |
9563877e | 244 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
245 | |
246 | out: | |
247 | if (primary_if) | |
e5d89254 | 248 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
249 | } |
250 | ||
56303d34 SE |
251 | static void |
252 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 253 | { |
e9a4f295 SE |
254 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
255 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
256 | return; |
257 | ||
e9a4f295 | 258 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 259 | |
3e34819e SE |
260 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
261 | hard_iface->net_dev->name); | |
c6c8fea2 | 262 | |
9563877e | 263 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
264 | } |
265 | ||
56303d34 | 266 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
9563877e | 267 | const char *iface_name) |
c6c8fea2 | 268 | { |
56303d34 | 269 | struct batadv_priv *bat_priv; |
e44d8fe2 | 270 | struct net_device *soft_iface; |
7e071c79 | 271 | __be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN); |
e44d8fe2 | 272 | int ret; |
c6c8fea2 | 273 | |
e9a4f295 | 274 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
275 | goto out; |
276 | ||
e6c10f43 | 277 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
278 | goto out; |
279 | ||
6e242f90 ML |
280 | /* hard-interface is part of a bridge */ |
281 | if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT) | |
86ceb360 | 282 | 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 |
283 | hard_iface->net_dev->name); |
284 | ||
e44d8fe2 | 285 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 286 | |
e44d8fe2 | 287 | if (!soft_iface) { |
04b482a2 | 288 | soft_iface = batadv_softif_create(iface_name); |
c6c8fea2 | 289 | |
e44d8fe2 SE |
290 | if (!soft_iface) { |
291 | ret = -ENOMEM; | |
c6c8fea2 | 292 | goto err; |
e44d8fe2 | 293 | } |
c6c8fea2 SE |
294 | |
295 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
296 | dev_hold(soft_iface); |
297 | } | |
298 | ||
04b482a2 | 299 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 300 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 301 | soft_iface->name); |
e44d8fe2 | 302 | ret = -EINVAL; |
77af7575 | 303 | goto err_dev; |
c6c8fea2 SE |
304 | } |
305 | ||
e44d8fe2 | 306 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 307 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 308 | |
77af7575 | 309 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
5346c35e | 310 | if (ret < 0) |
77af7575 | 311 | goto err_dev; |
c6c8fea2 | 312 | |
e6c10f43 | 313 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 314 | bat_priv->num_ifaces++; |
e9a4f295 | 315 | hard_iface->if_status = BATADV_IF_INACTIVE; |
7d211efc | 316 | batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 317 | |
7e071c79 | 318 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 319 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
320 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
321 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 322 | |
e6c10f43 | 323 | atomic_set(&hard_iface->frag_seqno, 1); |
3e34819e SE |
324 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
325 | hard_iface->net_dev->name); | |
c6c8fea2 | 326 | |
e6c10f43 | 327 | if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
c11fdfae | 328 | ETH_DATA_LEN + BATADV_HEADER_LEN) |
3e34819e SE |
329 | batadv_info(hard_iface->soft_iface, |
330 | "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", | |
331 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 332 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 333 | |
e6c10f43 | 334 | if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
c11fdfae | 335 | ETH_DATA_LEN + BATADV_HEADER_LEN) |
3e34819e SE |
336 | batadv_info(hard_iface->soft_iface, |
337 | "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", | |
338 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, | |
c11fdfae | 339 | ETH_DATA_LEN + BATADV_HEADER_LEN); |
c6c8fea2 | 340 | |
18a1cb6e SE |
341 | if (batadv_hardif_is_iface_up(hard_iface)) |
342 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 343 | else |
3e34819e SE |
344 | batadv_err(hard_iface->soft_iface, |
345 | "Not using interface %s (retrying later): interface not active\n", | |
346 | hard_iface->net_dev->name); | |
c6c8fea2 SE |
347 | |
348 | /* begin scheduling originator messages on that interface */ | |
9455e34c | 349 | batadv_schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
350 | |
351 | out: | |
352 | return 0; | |
353 | ||
77af7575 ML |
354 | err_dev: |
355 | dev_put(soft_iface); | |
c6c8fea2 | 356 | err: |
e5d89254 | 357 | batadv_hardif_free_ref(hard_iface); |
e44d8fe2 | 358 | return ret; |
c6c8fea2 SE |
359 | } |
360 | ||
56303d34 | 361 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 362 | { |
56303d34 SE |
363 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
364 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 365 | |
e9a4f295 | 366 | if (hard_iface->if_status == BATADV_IF_ACTIVE) |
18a1cb6e | 367 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 368 | |
e9a4f295 | 369 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 370 | goto out; |
c6c8fea2 | 371 | |
3e34819e SE |
372 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
373 | hard_iface->net_dev->name); | |
e6c10f43 | 374 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
c6c8fea2 SE |
375 | |
376 | bat_priv->num_ifaces--; | |
7d211efc | 377 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 378 | |
e5d89254 | 379 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 380 | if (hard_iface == primary_if) { |
56303d34 | 381 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 382 | |
18a1cb6e SE |
383 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
384 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
385 | |
386 | if (new_if) | |
e5d89254 | 387 | batadv_hardif_free_ref(new_if); |
c6c8fea2 SE |
388 | } |
389 | ||
00a50076 | 390 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e9a4f295 | 391 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 392 | |
e6c10f43 | 393 | /* delete all references to this hard_iface */ |
7d211efc | 394 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 395 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 396 | dev_put(hard_iface->soft_iface); |
c6c8fea2 SE |
397 | |
398 | /* nobody uses this interface anymore */ | |
399 | if (!bat_priv->num_ifaces) | |
04b482a2 | 400 | batadv_softif_destroy(hard_iface->soft_iface); |
c6c8fea2 | 401 | |
e6c10f43 | 402 | hard_iface->soft_iface = NULL; |
e5d89254 | 403 | batadv_hardif_free_ref(hard_iface); |
32ae9b22 ML |
404 | |
405 | out: | |
406 | if (primary_if) | |
e5d89254 | 407 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
408 | } |
409 | ||
56303d34 | 410 | static struct batadv_hard_iface * |
18a1cb6e | 411 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 412 | { |
56303d34 | 413 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
414 | int ret; |
415 | ||
c3caf519 SE |
416 | ASSERT_RTNL(); |
417 | ||
18a1cb6e | 418 | ret = batadv_is_valid_iface(net_dev); |
c6c8fea2 SE |
419 | if (ret != 1) |
420 | goto out; | |
421 | ||
422 | dev_hold(net_dev); | |
423 | ||
704509b8 | 424 | hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 425 | if (!hard_iface) |
c6c8fea2 | 426 | goto release_dev; |
c6c8fea2 | 427 | |
5853e22c | 428 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
429 | if (ret) |
430 | goto free_if; | |
431 | ||
e6c10f43 ML |
432 | hard_iface->if_num = -1; |
433 | hard_iface->net_dev = net_dev; | |
434 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 435 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
e6c10f43 | 436 | INIT_LIST_HEAD(&hard_iface->list); |
ed75ccbe | 437 | /* extra reference for return */ |
e6c10f43 | 438 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 439 | |
18a1cb6e | 440 | batadv_check_known_mac_addr(hard_iface->net_dev); |
3193e8fd | 441 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 442 | |
9cfc7bd6 | 443 | /* This can't be called via a bat_priv callback because |
8140625e ML |
444 | * we have no bat_priv yet. |
445 | */ | |
446 | atomic_set(&hard_iface->seqno, 1); | |
447 | hard_iface->packet_buff = NULL; | |
448 | ||
e6c10f43 | 449 | return hard_iface; |
c6c8fea2 SE |
450 | |
451 | free_if: | |
e6c10f43 | 452 | kfree(hard_iface); |
c6c8fea2 SE |
453 | release_dev: |
454 | dev_put(net_dev); | |
455 | out: | |
456 | return NULL; | |
457 | } | |
458 | ||
56303d34 | 459 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 460 | { |
c3caf519 SE |
461 | ASSERT_RTNL(); |
462 | ||
c6c8fea2 | 463 | /* first deactivate interface */ |
e9a4f295 | 464 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
9563877e | 465 | batadv_hardif_disable_interface(hard_iface); |
c6c8fea2 | 466 | |
e9a4f295 | 467 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
468 | return; |
469 | ||
e9a4f295 | 470 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
5853e22c | 471 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); |
e5d89254 | 472 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 SE |
473 | } |
474 | ||
9563877e | 475 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 476 | { |
56303d34 | 477 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 478 | |
c3caf519 | 479 | rtnl_lock(); |
e6c10f43 | 480 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 481 | &batadv_hardif_list, list) { |
e6c10f43 | 482 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 483 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
484 | } |
485 | rtnl_unlock(); | |
486 | } | |
487 | ||
18a1cb6e SE |
488 | static int batadv_hard_if_event(struct notifier_block *this, |
489 | unsigned long event, void *ptr) | |
c6c8fea2 | 490 | { |
5f718c20 | 491 | struct net_device *net_dev = ptr; |
56303d34 SE |
492 | struct batadv_hard_iface *hard_iface; |
493 | struct batadv_hard_iface *primary_if = NULL; | |
494 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 495 | |
56303d34 | 496 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
e6c10f43 | 497 | if (!hard_iface && event == NETDEV_REGISTER) |
18a1cb6e | 498 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 499 | |
e6c10f43 | 500 | if (!hard_iface) |
c6c8fea2 SE |
501 | goto out; |
502 | ||
503 | switch (event) { | |
504 | case NETDEV_UP: | |
18a1cb6e | 505 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
506 | break; |
507 | case NETDEV_GOING_DOWN: | |
508 | case NETDEV_DOWN: | |
18a1cb6e | 509 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
510 | break; |
511 | case NETDEV_UNREGISTER: | |
e6c10f43 | 512 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 513 | |
18a1cb6e | 514 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
515 | break; |
516 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 517 | if (hard_iface->soft_iface) |
9563877e | 518 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
519 | break; |
520 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 521 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
522 | goto hardif_put; |
523 | ||
18a1cb6e | 524 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 525 | |
e6c10f43 | 526 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c3229398 | 527 | bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface); |
01c4224b | 528 | |
e5d89254 | 529 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
530 | if (!primary_if) |
531 | goto hardif_put; | |
532 | ||
533 | if (hard_iface == primary_if) | |
18a1cb6e | 534 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
535 | break; |
536 | default: | |
537 | break; | |
f81c6224 | 538 | } |
c6c8fea2 SE |
539 | |
540 | hardif_put: | |
e5d89254 | 541 | batadv_hardif_free_ref(hard_iface); |
c6c8fea2 | 542 | out: |
32ae9b22 | 543 | if (primary_if) |
e5d89254 | 544 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
545 | return NOTIFY_DONE; |
546 | } | |
547 | ||
bc279080 | 548 | /* This function returns true if the interface represented by ifindex is a |
9cfc7bd6 SE |
549 | * 802.11 wireless device |
550 | */ | |
9563877e | 551 | bool batadv_is_wifi_iface(int ifindex) |
bc279080 AQ |
552 | { |
553 | struct net_device *net_device = NULL; | |
554 | bool ret = false; | |
555 | ||
42d0b044 | 556 | if (ifindex == BATADV_NULL_IFINDEX) |
bc279080 AQ |
557 | goto out; |
558 | ||
559 | net_device = dev_get_by_index(&init_net, ifindex); | |
560 | if (!net_device) | |
561 | goto out; | |
562 | ||
563 | #ifdef CONFIG_WIRELESS_EXT | |
564 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
9cfc7bd6 SE |
565 | * check for wireless_handlers != NULL |
566 | */ | |
bc279080 AQ |
567 | if (net_device->wireless_handlers) |
568 | ret = true; | |
569 | else | |
570 | #endif | |
571 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
572 | if (net_device->ieee80211_ptr) | |
573 | ret = true; | |
574 | out: | |
575 | if (net_device) | |
576 | dev_put(net_device); | |
577 | return ret; | |
578 | } | |
579 | ||
9563877e | 580 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 581 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 582 | }; |