Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "hard-interface.h" | |
24 | #include "soft-interface.h" | |
25 | #include "send.h" | |
26 | #include "translation-table.h" | |
27 | #include "routing.h" | |
28 | #include "bat_sysfs.h" | |
29 | #include "originator.h" | |
30 | #include "hash.h" | |
23721387 | 31 | #include "bridge_loop_avoidance.h" |
c6c8fea2 SE |
32 | |
33 | #include <linux/if_arp.h> | |
34 | ||
fb86d764 SE |
35 | |
36 | static int batman_skb_recv(struct sk_buff *skb, | |
37 | struct net_device *dev, | |
38 | struct packet_type *ptype, | |
39 | struct net_device *orig_dev); | |
40 | ||
ed75ccbe | 41 | void hardif_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 42 | { |
e6c10f43 | 43 | struct hard_iface *hard_iface; |
c6c8fea2 | 44 | |
e6c10f43 ML |
45 | hard_iface = container_of(rcu, struct hard_iface, rcu); |
46 | dev_put(hard_iface->net_dev); | |
47 | kfree(hard_iface); | |
c6c8fea2 SE |
48 | } |
49 | ||
747e4221 | 50 | struct hard_iface *hardif_get_by_netdev(const struct net_device *net_dev) |
c6c8fea2 | 51 | { |
e6c10f43 | 52 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
53 | |
54 | rcu_read_lock(); | |
e6c10f43 ML |
55 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
56 | if (hard_iface->net_dev == net_dev && | |
57 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
58 | goto out; |
59 | } | |
60 | ||
e6c10f43 | 61 | hard_iface = NULL; |
c6c8fea2 SE |
62 | |
63 | out: | |
c6c8fea2 | 64 | rcu_read_unlock(); |
e6c10f43 | 65 | return hard_iface; |
c6c8fea2 SE |
66 | } |
67 | ||
747e4221 | 68 | static int is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
69 | { |
70 | if (net_dev->flags & IFF_LOOPBACK) | |
71 | return 0; | |
72 | ||
73 | if (net_dev->type != ARPHRD_ETHER) | |
74 | return 0; | |
75 | ||
76 | if (net_dev->addr_len != ETH_ALEN) | |
77 | return 0; | |
78 | ||
79 | /* no batman over batman */ | |
e44d8fe2 | 80 | if (softif_is_valid(net_dev)) |
c6c8fea2 | 81 | return 0; |
c6c8fea2 SE |
82 | |
83 | /* Device is being bridged */ | |
84 | /* if (net_dev->priv_flags & IFF_BRIDGE_PORT) | |
85 | return 0; */ | |
86 | ||
87 | return 1; | |
88 | } | |
89 | ||
747e4221 | 90 | static struct hard_iface *hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 91 | { |
e6c10f43 | 92 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
93 | |
94 | rcu_read_lock(); | |
e6c10f43 ML |
95 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
96 | if (hard_iface->soft_iface != soft_iface) | |
c6c8fea2 SE |
97 | continue; |
98 | ||
e6c10f43 ML |
99 | if (hard_iface->if_status == IF_ACTIVE && |
100 | atomic_inc_not_zero(&hard_iface->refcount)) | |
c6c8fea2 SE |
101 | goto out; |
102 | } | |
103 | ||
e6c10f43 | 104 | hard_iface = NULL; |
c6c8fea2 SE |
105 | |
106 | out: | |
c6c8fea2 | 107 | rcu_read_unlock(); |
e6c10f43 | 108 | return hard_iface; |
c6c8fea2 SE |
109 | } |
110 | ||
23721387 SW |
111 | static void primary_if_update_addr(struct bat_priv *bat_priv, |
112 | struct hard_iface *oldif) | |
c6c8fea2 SE |
113 | { |
114 | struct vis_packet *vis_packet; | |
32ae9b22 ML |
115 | struct hard_iface *primary_if; |
116 | ||
117 | primary_if = primary_if_get_selected(bat_priv); | |
118 | if (!primary_if) | |
119 | goto out; | |
c6c8fea2 SE |
120 | |
121 | vis_packet = (struct vis_packet *) | |
122 | bat_priv->my_vis_info->skb_packet->data; | |
32ae9b22 | 123 | memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 124 | memcpy(vis_packet->sender_orig, |
32ae9b22 ML |
125 | primary_if->net_dev->dev_addr, ETH_ALEN); |
126 | ||
23721387 | 127 | bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
128 | out: |
129 | if (primary_if) | |
130 | hardif_free_ref(primary_if); | |
c6c8fea2 SE |
131 | } |
132 | ||
32ae9b22 ML |
133 | static void primary_if_select(struct bat_priv *bat_priv, |
134 | struct hard_iface *new_hard_iface) | |
c6c8fea2 | 135 | { |
32ae9b22 | 136 | struct hard_iface *curr_hard_iface; |
c6c8fea2 | 137 | |
c3caf519 | 138 | ASSERT_RTNL(); |
c6c8fea2 | 139 | |
32ae9b22 ML |
140 | if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) |
141 | new_hard_iface = NULL; | |
c6c8fea2 | 142 | |
728cbc6a | 143 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 144 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 145 | |
32ae9b22 | 146 | if (!new_hard_iface) |
23721387 | 147 | goto out; |
32ae9b22 | 148 | |
01c4224b | 149 | bat_priv->bat_algo_ops->bat_ogm_init_primary(new_hard_iface); |
23721387 SW |
150 | primary_if_update_addr(bat_priv, curr_hard_iface); |
151 | ||
152 | out: | |
153 | if (curr_hard_iface) | |
154 | hardif_free_ref(curr_hard_iface); | |
c6c8fea2 SE |
155 | } |
156 | ||
747e4221 | 157 | static bool hardif_is_iface_up(const struct hard_iface *hard_iface) |
c6c8fea2 | 158 | { |
e6c10f43 | 159 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
160 | return true; |
161 | ||
162 | return false; | |
163 | } | |
164 | ||
747e4221 | 165 | static void check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 166 | { |
747e4221 | 167 | const struct hard_iface *hard_iface; |
c6c8fea2 SE |
168 | |
169 | rcu_read_lock(); | |
e6c10f43 ML |
170 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
171 | if ((hard_iface->if_status != IF_ACTIVE) && | |
172 | (hard_iface->if_status != IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
173 | continue; |
174 | ||
e6c10f43 | 175 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
176 | continue; |
177 | ||
e6c10f43 ML |
178 | if (!compare_eth(hard_iface->net_dev->dev_addr, |
179 | net_dev->dev_addr)) | |
c6c8fea2 SE |
180 | continue; |
181 | ||
86ceb360 SE |
182 | pr_warning("The newly added mac address (%pM) already exists on: %s\n", |
183 | net_dev->dev_addr, hard_iface->net_dev->name); | |
184 | pr_warning("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
185 | } |
186 | rcu_read_unlock(); | |
187 | } | |
188 | ||
189 | int hardif_min_mtu(struct net_device *soft_iface) | |
190 | { | |
747e4221 SE |
191 | const struct bat_priv *bat_priv = netdev_priv(soft_iface); |
192 | const struct hard_iface *hard_iface; | |
c6c8fea2 SE |
193 | /* allow big frames if all devices are capable to do so |
194 | * (have MTU > 1500 + BAT_HEADER_LEN) */ | |
195 | int min_mtu = ETH_DATA_LEN; | |
196 | ||
197 | if (atomic_read(&bat_priv->fragmentation)) | |
198 | goto out; | |
199 | ||
200 | rcu_read_lock(); | |
e6c10f43 ML |
201 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
202 | if ((hard_iface->if_status != IF_ACTIVE) && | |
203 | (hard_iface->if_status != IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
204 | continue; |
205 | ||
e6c10f43 | 206 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
207 | continue; |
208 | ||
e6c10f43 | 209 | min_mtu = min_t(int, hard_iface->net_dev->mtu - BAT_HEADER_LEN, |
c6c8fea2 SE |
210 | min_mtu); |
211 | } | |
212 | rcu_read_unlock(); | |
213 | out: | |
214 | return min_mtu; | |
215 | } | |
216 | ||
217 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
218 | void update_min_mtu(struct net_device *soft_iface) | |
219 | { | |
220 | int min_mtu; | |
221 | ||
222 | min_mtu = hardif_min_mtu(soft_iface); | |
223 | if (soft_iface->mtu != min_mtu) | |
224 | soft_iface->mtu = min_mtu; | |
225 | } | |
226 | ||
e6c10f43 | 227 | static void hardif_activate_interface(struct hard_iface *hard_iface) |
c6c8fea2 SE |
228 | { |
229 | struct bat_priv *bat_priv; | |
32ae9b22 | 230 | struct hard_iface *primary_if = NULL; |
c6c8fea2 | 231 | |
e6c10f43 | 232 | if (hard_iface->if_status != IF_INACTIVE) |
32ae9b22 | 233 | goto out; |
c6c8fea2 | 234 | |
e6c10f43 | 235 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 236 | |
01c4224b | 237 | bat_priv->bat_algo_ops->bat_ogm_update_mac(hard_iface); |
e6c10f43 | 238 | hard_iface->if_status = IF_TO_BE_ACTIVATED; |
c6c8fea2 SE |
239 | |
240 | /** | |
241 | * the first active interface becomes our primary interface or | |
015758d0 | 242 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 243 | */ |
32ae9b22 ML |
244 | primary_if = primary_if_get_selected(bat_priv); |
245 | if (!primary_if) | |
246 | primary_if_select(bat_priv, hard_iface); | |
c6c8fea2 | 247 | |
e6c10f43 ML |
248 | bat_info(hard_iface->soft_iface, "Interface activated: %s\n", |
249 | hard_iface->net_dev->name); | |
c6c8fea2 | 250 | |
e6c10f43 | 251 | update_min_mtu(hard_iface->soft_iface); |
32ae9b22 ML |
252 | |
253 | out: | |
254 | if (primary_if) | |
255 | hardif_free_ref(primary_if); | |
c6c8fea2 SE |
256 | } |
257 | ||
e6c10f43 | 258 | static void hardif_deactivate_interface(struct hard_iface *hard_iface) |
c6c8fea2 | 259 | { |
e6c10f43 ML |
260 | if ((hard_iface->if_status != IF_ACTIVE) && |
261 | (hard_iface->if_status != IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
262 | return; |
263 | ||
e6c10f43 | 264 | hard_iface->if_status = IF_INACTIVE; |
c6c8fea2 | 265 | |
e6c10f43 ML |
266 | bat_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
267 | hard_iface->net_dev->name); | |
c6c8fea2 | 268 | |
e6c10f43 | 269 | update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
270 | } |
271 | ||
747e4221 SE |
272 | int hardif_enable_interface(struct hard_iface *hard_iface, |
273 | const char *iface_name) | |
c6c8fea2 SE |
274 | { |
275 | struct bat_priv *bat_priv; | |
e44d8fe2 SE |
276 | struct net_device *soft_iface; |
277 | int ret; | |
c6c8fea2 | 278 | |
e6c10f43 | 279 | if (hard_iface->if_status != IF_NOT_IN_USE) |
c6c8fea2 SE |
280 | goto out; |
281 | ||
e6c10f43 | 282 | if (!atomic_inc_not_zero(&hard_iface->refcount)) |
ed75ccbe ML |
283 | goto out; |
284 | ||
6e242f90 ML |
285 | /* hard-interface is part of a bridge */ |
286 | if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT) | |
86ceb360 | 287 | 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 |
288 | hard_iface->net_dev->name); |
289 | ||
e44d8fe2 | 290 | soft_iface = dev_get_by_name(&init_net, iface_name); |
c6c8fea2 | 291 | |
e44d8fe2 SE |
292 | if (!soft_iface) { |
293 | soft_iface = softif_create(iface_name); | |
c6c8fea2 | 294 | |
e44d8fe2 SE |
295 | if (!soft_iface) { |
296 | ret = -ENOMEM; | |
c6c8fea2 | 297 | goto err; |
e44d8fe2 | 298 | } |
c6c8fea2 SE |
299 | |
300 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
301 | dev_hold(soft_iface); |
302 | } | |
303 | ||
304 | if (!softif_is_valid(soft_iface)) { | |
86ceb360 | 305 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 306 | soft_iface->name); |
e44d8fe2 | 307 | ret = -EINVAL; |
77af7575 | 308 | goto err_dev; |
c6c8fea2 SE |
309 | } |
310 | ||
e44d8fe2 | 311 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 312 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 313 | |
77af7575 ML |
314 | ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface); |
315 | if (ret < 0) { | |
e44d8fe2 | 316 | ret = -ENOMEM; |
77af7575 | 317 | goto err_dev; |
c6c8fea2 SE |
318 | } |
319 | ||
e6c10f43 | 320 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 321 | bat_priv->num_ifaces++; |
e6c10f43 ML |
322 | hard_iface->if_status = IF_INACTIVE; |
323 | orig_hash_add_if(hard_iface, bat_priv->num_ifaces); | |
c6c8fea2 | 324 | |
e6c10f43 ML |
325 | hard_iface->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN); |
326 | hard_iface->batman_adv_ptype.func = batman_skb_recv; | |
327 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; | |
328 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 329 | |
e6c10f43 ML |
330 | atomic_set(&hard_iface->frag_seqno, 1); |
331 | bat_info(hard_iface->soft_iface, "Adding interface: %s\n", | |
332 | hard_iface->net_dev->name); | |
c6c8fea2 | 333 | |
e6c10f43 | 334 | if (atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
c6c8fea2 | 335 | ETH_DATA_LEN + BAT_HEADER_LEN) |
e6c10f43 | 336 | bat_info(hard_iface->soft_iface, |
86ceb360 | 337 | "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", |
7c64fd98 SE |
338 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
339 | ETH_DATA_LEN + BAT_HEADER_LEN); | |
c6c8fea2 | 340 | |
e6c10f43 | 341 | if (!atomic_read(&bat_priv->fragmentation) && hard_iface->net_dev->mtu < |
c6c8fea2 | 342 | ETH_DATA_LEN + BAT_HEADER_LEN) |
e6c10f43 | 343 | bat_info(hard_iface->soft_iface, |
86ceb360 | 344 | "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", |
7c64fd98 SE |
345 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
346 | ETH_DATA_LEN + BAT_HEADER_LEN); | |
c6c8fea2 | 347 | |
e6c10f43 ML |
348 | if (hardif_is_iface_up(hard_iface)) |
349 | hardif_activate_interface(hard_iface); | |
c6c8fea2 | 350 | else |
86ceb360 SE |
351 | bat_err(hard_iface->soft_iface, |
352 | "Not using interface %s (retrying later): interface not active\n", | |
e6c10f43 | 353 | hard_iface->net_dev->name); |
c6c8fea2 SE |
354 | |
355 | /* begin scheduling originator messages on that interface */ | |
b9dacc52 | 356 | schedule_bat_ogm(hard_iface); |
c6c8fea2 SE |
357 | |
358 | out: | |
359 | return 0; | |
360 | ||
77af7575 ML |
361 | err_dev: |
362 | dev_put(soft_iface); | |
c6c8fea2 | 363 | err: |
e6c10f43 | 364 | hardif_free_ref(hard_iface); |
e44d8fe2 | 365 | return ret; |
c6c8fea2 SE |
366 | } |
367 | ||
e6c10f43 | 368 | void hardif_disable_interface(struct hard_iface *hard_iface) |
c6c8fea2 | 369 | { |
e6c10f43 | 370 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
32ae9b22 | 371 | struct hard_iface *primary_if = NULL; |
c6c8fea2 | 372 | |
e6c10f43 ML |
373 | if (hard_iface->if_status == IF_ACTIVE) |
374 | hardif_deactivate_interface(hard_iface); | |
c6c8fea2 | 375 | |
e6c10f43 | 376 | if (hard_iface->if_status != IF_INACTIVE) |
32ae9b22 | 377 | goto out; |
c6c8fea2 | 378 | |
e6c10f43 ML |
379 | bat_info(hard_iface->soft_iface, "Removing interface: %s\n", |
380 | hard_iface->net_dev->name); | |
381 | dev_remove_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 SE |
382 | |
383 | bat_priv->num_ifaces--; | |
e6c10f43 | 384 | orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 385 | |
32ae9b22 ML |
386 | primary_if = primary_if_get_selected(bat_priv); |
387 | if (hard_iface == primary_if) { | |
e6c10f43 | 388 | struct hard_iface *new_if; |
c6c8fea2 | 389 | |
e6c10f43 | 390 | new_if = hardif_get_active(hard_iface->soft_iface); |
32ae9b22 | 391 | primary_if_select(bat_priv, new_if); |
c6c8fea2 SE |
392 | |
393 | if (new_if) | |
ed75ccbe | 394 | hardif_free_ref(new_if); |
c6c8fea2 SE |
395 | } |
396 | ||
00a50076 | 397 | bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); |
e6c10f43 | 398 | hard_iface->if_status = IF_NOT_IN_USE; |
c6c8fea2 | 399 | |
e6c10f43 | 400 | /* delete all references to this hard_iface */ |
c6c8fea2 | 401 | purge_orig_ref(bat_priv); |
e6c10f43 ML |
402 | purge_outstanding_packets(bat_priv, hard_iface); |
403 | dev_put(hard_iface->soft_iface); | |
c6c8fea2 SE |
404 | |
405 | /* nobody uses this interface anymore */ | |
406 | if (!bat_priv->num_ifaces) | |
e6c10f43 | 407 | softif_destroy(hard_iface->soft_iface); |
c6c8fea2 | 408 | |
e6c10f43 ML |
409 | hard_iface->soft_iface = NULL; |
410 | hardif_free_ref(hard_iface); | |
32ae9b22 ML |
411 | |
412 | out: | |
413 | if (primary_if) | |
414 | hardif_free_ref(primary_if); | |
c6c8fea2 SE |
415 | } |
416 | ||
e6c10f43 | 417 | static struct hard_iface *hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 418 | { |
e6c10f43 | 419 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
420 | int ret; |
421 | ||
c3caf519 SE |
422 | ASSERT_RTNL(); |
423 | ||
c6c8fea2 SE |
424 | ret = is_valid_iface(net_dev); |
425 | if (ret != 1) | |
426 | goto out; | |
427 | ||
428 | dev_hold(net_dev); | |
429 | ||
704509b8 | 430 | hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 431 | if (!hard_iface) |
c6c8fea2 | 432 | goto release_dev; |
c6c8fea2 | 433 | |
e6c10f43 | 434 | ret = sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
435 | if (ret) |
436 | goto free_if; | |
437 | ||
e6c10f43 ML |
438 | hard_iface->if_num = -1; |
439 | hard_iface->net_dev = net_dev; | |
440 | hard_iface->soft_iface = NULL; | |
441 | hard_iface->if_status = IF_NOT_IN_USE; | |
442 | INIT_LIST_HEAD(&hard_iface->list); | |
ed75ccbe | 443 | /* extra reference for return */ |
e6c10f43 | 444 | atomic_set(&hard_iface->refcount, 2); |
c6c8fea2 | 445 | |
e6c10f43 | 446 | check_known_mac_addr(hard_iface->net_dev); |
e6c10f43 | 447 | list_add_tail_rcu(&hard_iface->list, &hardif_list); |
c6c8fea2 | 448 | |
8140625e ML |
449 | /** |
450 | * This can't be called via a bat_priv callback because | |
451 | * we have no bat_priv yet. | |
452 | */ | |
453 | atomic_set(&hard_iface->seqno, 1); | |
454 | hard_iface->packet_buff = NULL; | |
455 | ||
e6c10f43 | 456 | return hard_iface; |
c6c8fea2 SE |
457 | |
458 | free_if: | |
e6c10f43 | 459 | kfree(hard_iface); |
c6c8fea2 SE |
460 | release_dev: |
461 | dev_put(net_dev); | |
462 | out: | |
463 | return NULL; | |
464 | } | |
465 | ||
e6c10f43 | 466 | static void hardif_remove_interface(struct hard_iface *hard_iface) |
c6c8fea2 | 467 | { |
c3caf519 SE |
468 | ASSERT_RTNL(); |
469 | ||
c6c8fea2 | 470 | /* first deactivate interface */ |
e6c10f43 ML |
471 | if (hard_iface->if_status != IF_NOT_IN_USE) |
472 | hardif_disable_interface(hard_iface); | |
c6c8fea2 | 473 | |
e6c10f43 | 474 | if (hard_iface->if_status != IF_NOT_IN_USE) |
c6c8fea2 SE |
475 | return; |
476 | ||
e6c10f43 ML |
477 | hard_iface->if_status = IF_TO_BE_REMOVED; |
478 | sysfs_del_hardif(&hard_iface->hardif_obj); | |
479 | hardif_free_ref(hard_iface); | |
c6c8fea2 SE |
480 | } |
481 | ||
482 | void hardif_remove_interfaces(void) | |
483 | { | |
e6c10f43 | 484 | struct hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 485 | |
c3caf519 | 486 | rtnl_lock(); |
e6c10f43 ML |
487 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
488 | &hardif_list, list) { | |
489 | list_del_rcu(&hard_iface->list); | |
e6c10f43 | 490 | hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
491 | } |
492 | rtnl_unlock(); | |
493 | } | |
494 | ||
495 | static int hard_if_event(struct notifier_block *this, | |
496 | unsigned long event, void *ptr) | |
497 | { | |
5f718c20 | 498 | struct net_device *net_dev = ptr; |
e6c10f43 | 499 | struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev); |
32ae9b22 | 500 | struct hard_iface *primary_if = NULL; |
c6c8fea2 SE |
501 | struct bat_priv *bat_priv; |
502 | ||
e6c10f43 ML |
503 | if (!hard_iface && event == NETDEV_REGISTER) |
504 | hard_iface = hardif_add_interface(net_dev); | |
c6c8fea2 | 505 | |
e6c10f43 | 506 | if (!hard_iface) |
c6c8fea2 SE |
507 | goto out; |
508 | ||
509 | switch (event) { | |
510 | case NETDEV_UP: | |
e6c10f43 | 511 | hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
512 | break; |
513 | case NETDEV_GOING_DOWN: | |
514 | case NETDEV_DOWN: | |
e6c10f43 | 515 | hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
516 | break; |
517 | case NETDEV_UNREGISTER: | |
e6c10f43 | 518 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 519 | |
e6c10f43 | 520 | hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
521 | break; |
522 | case NETDEV_CHANGEMTU: | |
e6c10f43 ML |
523 | if (hard_iface->soft_iface) |
524 | update_min_mtu(hard_iface->soft_iface); | |
c6c8fea2 SE |
525 | break; |
526 | case NETDEV_CHANGEADDR: | |
e6c10f43 | 527 | if (hard_iface->if_status == IF_NOT_IN_USE) |
c6c8fea2 SE |
528 | goto hardif_put; |
529 | ||
e6c10f43 | 530 | check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 531 | |
e6c10f43 | 532 | bat_priv = netdev_priv(hard_iface->soft_iface); |
01c4224b ML |
533 | bat_priv->bat_algo_ops->bat_ogm_update_mac(hard_iface); |
534 | ||
32ae9b22 ML |
535 | primary_if = primary_if_get_selected(bat_priv); |
536 | if (!primary_if) | |
537 | goto hardif_put; | |
538 | ||
539 | if (hard_iface == primary_if) | |
23721387 | 540 | primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
541 | break; |
542 | default: | |
543 | break; | |
f81c6224 | 544 | } |
c6c8fea2 SE |
545 | |
546 | hardif_put: | |
e6c10f43 | 547 | hardif_free_ref(hard_iface); |
c6c8fea2 | 548 | out: |
32ae9b22 ML |
549 | if (primary_if) |
550 | hardif_free_ref(primary_if); | |
c6c8fea2 SE |
551 | return NOTIFY_DONE; |
552 | } | |
553 | ||
015758d0 | 554 | /* incoming packets with the batman ethertype received on any active hard |
c6c8fea2 | 555 | * interface */ |
fb86d764 SE |
556 | static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, |
557 | struct packet_type *ptype, | |
558 | struct net_device *orig_dev) | |
c6c8fea2 SE |
559 | { |
560 | struct bat_priv *bat_priv; | |
b6da4bf5 | 561 | struct batman_ogm_packet *batman_ogm_packet; |
e6c10f43 | 562 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
563 | int ret; |
564 | ||
e6c10f43 | 565 | hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype); |
c6c8fea2 SE |
566 | skb = skb_share_check(skb, GFP_ATOMIC); |
567 | ||
568 | /* skb was released by skb_share_check() */ | |
569 | if (!skb) | |
570 | goto err_out; | |
571 | ||
572 | /* packet should hold at least type and version */ | |
573 | if (unlikely(!pskb_may_pull(skb, 2))) | |
574 | goto err_free; | |
575 | ||
576 | /* expect a valid ethernet header here. */ | |
7c64fd98 SE |
577 | if (unlikely(skb->mac_len != sizeof(struct ethhdr) || |
578 | !skb_mac_header(skb))) | |
c6c8fea2 SE |
579 | goto err_free; |
580 | ||
e6c10f43 | 581 | if (!hard_iface->soft_iface) |
c6c8fea2 SE |
582 | goto err_free; |
583 | ||
e6c10f43 | 584 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 SE |
585 | |
586 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
587 | goto err_free; | |
588 | ||
589 | /* discard frames on not active interfaces */ | |
e6c10f43 | 590 | if (hard_iface->if_status != IF_ACTIVE) |
c6c8fea2 SE |
591 | goto err_free; |
592 | ||
b6da4bf5 | 593 | batman_ogm_packet = (struct batman_ogm_packet *)skb->data; |
c6c8fea2 | 594 | |
76543d14 | 595 | if (batman_ogm_packet->header.version != COMPAT_VERSION) { |
c6c8fea2 SE |
596 | bat_dbg(DBG_BATMAN, bat_priv, |
597 | "Drop packet: incompatible batman version (%i)\n", | |
76543d14 | 598 | batman_ogm_packet->header.version); |
c6c8fea2 SE |
599 | goto err_free; |
600 | } | |
601 | ||
602 | /* all receive handlers return whether they received or reused | |
603 | * the supplied skb. if not, we have to free the skb. */ | |
604 | ||
76543d14 | 605 | switch (batman_ogm_packet->header.packet_type) { |
c6c8fea2 | 606 | /* batman originator packet */ |
b6da4bf5 | 607 | case BAT_OGM: |
fc957275 | 608 | ret = recv_bat_ogm_packet(skb, hard_iface); |
c6c8fea2 SE |
609 | break; |
610 | ||
611 | /* batman icmp packet */ | |
612 | case BAT_ICMP: | |
e6c10f43 | 613 | ret = recv_icmp_packet(skb, hard_iface); |
c6c8fea2 SE |
614 | break; |
615 | ||
616 | /* unicast packet */ | |
617 | case BAT_UNICAST: | |
e6c10f43 | 618 | ret = recv_unicast_packet(skb, hard_iface); |
c6c8fea2 SE |
619 | break; |
620 | ||
621 | /* fragmented unicast packet */ | |
622 | case BAT_UNICAST_FRAG: | |
e6c10f43 | 623 | ret = recv_ucast_frag_packet(skb, hard_iface); |
c6c8fea2 SE |
624 | break; |
625 | ||
626 | /* broadcast packet */ | |
627 | case BAT_BCAST: | |
e6c10f43 | 628 | ret = recv_bcast_packet(skb, hard_iface); |
c6c8fea2 SE |
629 | break; |
630 | ||
631 | /* vis packet */ | |
632 | case BAT_VIS: | |
e6c10f43 | 633 | ret = recv_vis_packet(skb, hard_iface); |
c6c8fea2 | 634 | break; |
a73105b8 AQ |
635 | /* Translation table query (request or response) */ |
636 | case BAT_TT_QUERY: | |
637 | ret = recv_tt_query(skb, hard_iface); | |
638 | break; | |
cc47f66e AQ |
639 | /* Roaming advertisement */ |
640 | case BAT_ROAM_ADV: | |
641 | ret = recv_roam_adv(skb, hard_iface); | |
642 | break; | |
c6c8fea2 SE |
643 | default: |
644 | ret = NET_RX_DROP; | |
645 | } | |
646 | ||
647 | if (ret == NET_RX_DROP) | |
648 | kfree_skb(skb); | |
649 | ||
650 | /* return NET_RX_SUCCESS in any case as we | |
651 | * most probably dropped the packet for | |
652 | * routing-logical reasons. */ | |
653 | ||
654 | return NET_RX_SUCCESS; | |
655 | ||
656 | err_free: | |
657 | kfree_skb(skb); | |
658 | err_out: | |
659 | return NET_RX_DROP; | |
660 | } | |
661 | ||
bc279080 AQ |
662 | /* This function returns true if the interface represented by ifindex is a |
663 | * 802.11 wireless device */ | |
664 | bool is_wifi_iface(int ifindex) | |
665 | { | |
666 | struct net_device *net_device = NULL; | |
667 | bool ret = false; | |
668 | ||
669 | if (ifindex == NULL_IFINDEX) | |
670 | goto out; | |
671 | ||
672 | net_device = dev_get_by_index(&init_net, ifindex); | |
673 | if (!net_device) | |
674 | goto out; | |
675 | ||
676 | #ifdef CONFIG_WIRELESS_EXT | |
677 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
678 | * check for wireless_handlers != NULL */ | |
679 | if (net_device->wireless_handlers) | |
680 | ret = true; | |
681 | else | |
682 | #endif | |
683 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
684 | if (net_device->ieee80211_ptr) | |
685 | ret = true; | |
686 | out: | |
687 | if (net_device) | |
688 | dev_put(net_device); | |
689 | return ret; | |
690 | } | |
691 | ||
c6c8fea2 SE |
692 | struct notifier_block hard_if_notifier = { |
693 | .notifier_call = hard_if_event, | |
694 | }; |