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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> | |
fcafa5e7 | 26 | #include <linux/if.h> |
c6c8fea2 | 27 | #include <linux/if_arp.h> |
af5d4f77 | 28 | #include <linux/if_ether.h> |
1e2c2a4f | 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> |
275019d2 AL |
38 | #include <net/net_namespace.h> |
39 | #include <net/rtnetlink.h> | |
1e2c2a4f | 40 | |
a2d08166 | 41 | #include "bat_v.h" |
1e2c2a4f SE |
42 | #include "bridge_loop_avoidance.h" |
43 | #include "debugfs.h" | |
44 | #include "distributed-arp-table.h" | |
45 | #include "gateway_client.h" | |
ba412080 | 46 | #include "log.h" |
1e2c2a4f SE |
47 | #include "originator.h" |
48 | #include "packet.h" | |
49 | #include "send.h" | |
50 | #include "soft-interface.h" | |
51 | #include "sysfs.h" | |
52 | #include "translation-table.h" | |
c6c8fea2 | 53 | |
140ed8e8 SE |
54 | /** |
55 | * batadv_hardif_release - release hard interface from lists and queue for | |
56 | * free after rcu grace period | |
7a659d56 | 57 | * @ref: kref pointer of the hard interface |
140ed8e8 | 58 | */ |
7a659d56 | 59 | void batadv_hardif_release(struct kref *ref) |
c6c8fea2 | 60 | { |
7a659d56 SE |
61 | struct batadv_hard_iface *hard_iface; |
62 | ||
63 | hard_iface = container_of(ref, struct batadv_hard_iface, refcount); | |
e6c10f43 | 64 | dev_put(hard_iface->net_dev); |
140ed8e8 SE |
65 | |
66 | kfree_rcu(hard_iface, rcu); | |
c6c8fea2 SE |
67 | } |
68 | ||
56303d34 SE |
69 | struct batadv_hard_iface * |
70 | batadv_hardif_get_by_netdev(const struct net_device *net_dev) | |
c6c8fea2 | 71 | { |
56303d34 | 72 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
73 | |
74 | rcu_read_lock(); | |
3193e8fd | 75 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 76 | if (hard_iface->net_dev == net_dev && |
7a659d56 | 77 | kref_get_unless_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
78 | goto out; |
79 | } | |
80 | ||
e6c10f43 | 81 | hard_iface = NULL; |
c6c8fea2 SE |
82 | |
83 | out: | |
c6c8fea2 | 84 | rcu_read_unlock(); |
e6c10f43 | 85 | return hard_iface; |
c6c8fea2 SE |
86 | } |
87 | ||
275019d2 AL |
88 | /** |
89 | * batadv_getlink_net - return link net namespace (of use fallback) | |
90 | * @netdev: net_device to check | |
91 | * @fallback_net: return in case get_link_net is not available for @netdev | |
92 | * | |
93 | * Return: result of rtnl_link_ops->get_link_net or @fallback_net | |
94 | */ | |
95 | static const struct net *batadv_getlink_net(const struct net_device *netdev, | |
96 | const struct net *fallback_net) | |
97 | { | |
98 | if (!netdev->rtnl_link_ops) | |
99 | return fallback_net; | |
100 | ||
101 | if (!netdev->rtnl_link_ops->get_link_net) | |
102 | return fallback_net; | |
103 | ||
104 | return netdev->rtnl_link_ops->get_link_net(netdev); | |
105 | } | |
106 | ||
1bc4e2b0 AL |
107 | /** |
108 | * batadv_mutual_parents - check if two devices are each others parent | |
275019d2 AL |
109 | * @dev1: 1st net dev |
110 | * @net1: 1st devices netns | |
111 | * @dev2: 2nd net dev | |
112 | * @net2: 2nd devices netns | |
1bc4e2b0 AL |
113 | * |
114 | * veth devices come in pairs and each is the parent of the other! | |
115 | * | |
116 | * Return: true if the devices are each others parent, otherwise false | |
117 | */ | |
118 | static bool batadv_mutual_parents(const struct net_device *dev1, | |
275019d2 AL |
119 | const struct net *net1, |
120 | const struct net_device *dev2, | |
121 | const struct net *net2) | |
1bc4e2b0 AL |
122 | { |
123 | int dev1_parent_iflink = dev_get_iflink(dev1); | |
124 | int dev2_parent_iflink = dev_get_iflink(dev2); | |
275019d2 AL |
125 | const struct net *dev1_parent_net; |
126 | const struct net *dev2_parent_net; | |
127 | ||
128 | dev1_parent_net = batadv_getlink_net(dev1, net1); | |
129 | dev2_parent_net = batadv_getlink_net(dev2, net2); | |
1bc4e2b0 AL |
130 | |
131 | if (!dev1_parent_iflink || !dev2_parent_iflink) | |
132 | return false; | |
133 | ||
134 | return (dev1_parent_iflink == dev2->ifindex) && | |
275019d2 AL |
135 | (dev2_parent_iflink == dev1->ifindex) && |
136 | net_eq(dev1_parent_net, net2) && | |
137 | net_eq(dev2_parent_net, net1); | |
1bc4e2b0 AL |
138 | } |
139 | ||
b7eddd0b AQ |
140 | /** |
141 | * batadv_is_on_batman_iface - check if a device is a batman iface descendant | |
142 | * @net_dev: the device to check | |
143 | * | |
144 | * If the user creates any virtual device on top of a batman-adv interface, it | |
145 | * is important to prevent this new interface to be used to create a new mesh | |
146 | * network (this behaviour would lead to a batman-over-batman configuration). | |
147 | * This function recursively checks all the fathers of the device passed as | |
148 | * argument looking for a batman-adv soft interface. | |
149 | * | |
62fe710f | 150 | * Return: true if the device is descendant of a batman-adv mesh interface (or |
b7eddd0b AQ |
151 | * if it is a batman-adv interface itself), false otherwise |
152 | */ | |
153 | static bool batadv_is_on_batman_iface(const struct net_device *net_dev) | |
154 | { | |
2cd45a06 | 155 | struct net *net = dev_net(net_dev); |
275019d2 AL |
156 | struct net_device *parent_dev; |
157 | const struct net *parent_net; | |
b7eddd0b AQ |
158 | bool ret; |
159 | ||
160 | /* check if this is a batman-adv mesh interface */ | |
161 | if (batadv_softif_is_valid(net_dev)) | |
162 | return true; | |
163 | ||
164 | /* no more parents..stop recursion */ | |
a54acb3a ND |
165 | if (dev_get_iflink(net_dev) == 0 || |
166 | dev_get_iflink(net_dev) == net_dev->ifindex) | |
b7eddd0b AQ |
167 | return false; |
168 | ||
275019d2 AL |
169 | parent_net = batadv_getlink_net(net_dev, net); |
170 | ||
b7eddd0b | 171 | /* recurse over the parent device */ |
275019d2 AL |
172 | parent_dev = __dev_get_by_index((struct net *)parent_net, |
173 | dev_get_iflink(net_dev)); | |
b7eddd0b AQ |
174 | /* if we got a NULL parent_dev there is something broken.. */ |
175 | if (WARN(!parent_dev, "Cannot find parent device")) | |
176 | return false; | |
177 | ||
275019d2 | 178 | if (batadv_mutual_parents(net_dev, net, parent_dev, parent_net)) |
1bc4e2b0 AL |
179 | return false; |
180 | ||
b7eddd0b AQ |
181 | ret = batadv_is_on_batman_iface(parent_dev); |
182 | ||
b7eddd0b AQ |
183 | return ret; |
184 | } | |
185 | ||
4b426b10 | 186 | static bool batadv_is_valid_iface(const struct net_device *net_dev) |
c6c8fea2 SE |
187 | { |
188 | if (net_dev->flags & IFF_LOOPBACK) | |
4b426b10 | 189 | return false; |
c6c8fea2 SE |
190 | |
191 | if (net_dev->type != ARPHRD_ETHER) | |
4b426b10 | 192 | return false; |
c6c8fea2 SE |
193 | |
194 | if (net_dev->addr_len != ETH_ALEN) | |
4b426b10 | 195 | return false; |
c6c8fea2 SE |
196 | |
197 | /* no batman over batman */ | |
b7eddd0b | 198 | if (batadv_is_on_batman_iface(net_dev)) |
4b426b10 | 199 | return false; |
c6c8fea2 | 200 | |
4b426b10 | 201 | return true; |
c6c8fea2 SE |
202 | } |
203 | ||
de68d100 MS |
204 | /** |
205 | * batadv_is_wifi_netdev - check if the given net_device struct is a wifi | |
206 | * interface | |
207 | * @net_device: the device to check | |
208 | * | |
62fe710f | 209 | * Return: true if the net device is a 802.11 wireless device, false otherwise. |
de68d100 | 210 | */ |
0c69aecc | 211 | bool batadv_is_wifi_netdev(struct net_device *net_device) |
de68d100 | 212 | { |
0c69aecc AQ |
213 | if (!net_device) |
214 | return false; | |
215 | ||
de68d100 MS |
216 | #ifdef CONFIG_WIRELESS_EXT |
217 | /* pre-cfg80211 drivers have to implement WEXT, so it is possible to | |
218 | * check for wireless_handlers != NULL | |
219 | */ | |
220 | if (net_device->wireless_handlers) | |
221 | return true; | |
222 | #endif | |
223 | ||
224 | /* cfg80211 drivers have to set ieee80211_ptr */ | |
225 | if (net_device->ieee80211_ptr) | |
226 | return true; | |
227 | ||
228 | return false; | |
229 | } | |
230 | ||
56303d34 | 231 | static struct batadv_hard_iface * |
18a1cb6e | 232 | batadv_hardif_get_active(const struct net_device *soft_iface) |
c6c8fea2 | 233 | { |
56303d34 | 234 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
235 | |
236 | rcu_read_lock(); | |
3193e8fd | 237 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e6c10f43 | 238 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
239 | continue; |
240 | ||
e9a4f295 | 241 | if (hard_iface->if_status == BATADV_IF_ACTIVE && |
7a659d56 | 242 | kref_get_unless_zero(&hard_iface->refcount)) |
c6c8fea2 SE |
243 | goto out; |
244 | } | |
245 | ||
e6c10f43 | 246 | hard_iface = NULL; |
c6c8fea2 SE |
247 | |
248 | out: | |
c6c8fea2 | 249 | rcu_read_unlock(); |
e6c10f43 | 250 | return hard_iface; |
c6c8fea2 SE |
251 | } |
252 | ||
56303d34 SE |
253 | static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, |
254 | struct batadv_hard_iface *oldif) | |
c6c8fea2 | 255 | { |
56303d34 | 256 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 257 | |
e5d89254 | 258 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
259 | if (!primary_if) |
260 | goto out; | |
c6c8fea2 | 261 | |
785ea114 | 262 | batadv_dat_init_own_addr(bat_priv, primary_if); |
08adf151 | 263 | batadv_bla_update_orig_address(bat_priv, primary_if, oldif); |
32ae9b22 ML |
264 | out: |
265 | if (primary_if) | |
82047ad7 | 266 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
267 | } |
268 | ||
56303d34 SE |
269 | static void batadv_primary_if_select(struct batadv_priv *bat_priv, |
270 | struct batadv_hard_iface *new_hard_iface) | |
c6c8fea2 | 271 | { |
56303d34 | 272 | struct batadv_hard_iface *curr_hard_iface; |
c6c8fea2 | 273 | |
c3caf519 | 274 | ASSERT_RTNL(); |
c6c8fea2 | 275 | |
17a86915 SE |
276 | if (new_hard_iface) |
277 | kref_get(&new_hard_iface->refcount); | |
c6c8fea2 | 278 | |
728cbc6a | 279 | curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); |
32ae9b22 | 280 | rcu_assign_pointer(bat_priv->primary_if, new_hard_iface); |
c6c8fea2 | 281 | |
32ae9b22 | 282 | if (!new_hard_iface) |
23721387 | 283 | goto out; |
32ae9b22 | 284 | |
29824a55 | 285 | bat_priv->algo_ops->iface.primary_set(new_hard_iface); |
18a1cb6e | 286 | batadv_primary_if_update_addr(bat_priv, curr_hard_iface); |
23721387 SW |
287 | |
288 | out: | |
289 | if (curr_hard_iface) | |
82047ad7 | 290 | batadv_hardif_put(curr_hard_iface); |
c6c8fea2 SE |
291 | } |
292 | ||
56303d34 SE |
293 | static bool |
294 | batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 295 | { |
e6c10f43 | 296 | if (hard_iface->net_dev->flags & IFF_UP) |
c6c8fea2 SE |
297 | return true; |
298 | ||
299 | return false; | |
300 | } | |
301 | ||
18a1cb6e | 302 | static void batadv_check_known_mac_addr(const struct net_device *net_dev) |
c6c8fea2 | 303 | { |
56303d34 | 304 | const struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
305 | |
306 | rcu_read_lock(); | |
3193e8fd | 307 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
308 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
309 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
310 | continue; |
311 | ||
e6c10f43 | 312 | if (hard_iface->net_dev == net_dev) |
c6c8fea2 SE |
313 | continue; |
314 | ||
1eda58bf SE |
315 | if (!batadv_compare_eth(hard_iface->net_dev->dev_addr, |
316 | net_dev->dev_addr)) | |
c6c8fea2 SE |
317 | continue; |
318 | ||
67969581 SE |
319 | pr_warn("The newly added mac address (%pM) already exists on: %s\n", |
320 | net_dev->dev_addr, hard_iface->net_dev->name); | |
321 | pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n"); | |
c6c8fea2 SE |
322 | } |
323 | rcu_read_unlock(); | |
324 | } | |
325 | ||
7bca68c7 SE |
326 | /** |
327 | * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom | |
328 | * @soft_iface: netdev struct of the mesh interface | |
329 | */ | |
330 | static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface) | |
331 | { | |
332 | const struct batadv_hard_iface *hard_iface; | |
333 | unsigned short lower_header_len = ETH_HLEN; | |
334 | unsigned short lower_headroom = 0; | |
335 | unsigned short lower_tailroom = 0; | |
336 | unsigned short needed_headroom; | |
337 | ||
338 | rcu_read_lock(); | |
339 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
340 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) | |
341 | continue; | |
342 | ||
343 | if (hard_iface->soft_iface != soft_iface) | |
344 | continue; | |
345 | ||
346 | lower_header_len = max_t(unsigned short, lower_header_len, | |
347 | hard_iface->net_dev->hard_header_len); | |
348 | ||
349 | lower_headroom = max_t(unsigned short, lower_headroom, | |
350 | hard_iface->net_dev->needed_headroom); | |
351 | ||
352 | lower_tailroom = max_t(unsigned short, lower_tailroom, | |
353 | hard_iface->net_dev->needed_tailroom); | |
354 | } | |
355 | rcu_read_unlock(); | |
356 | ||
357 | needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN); | |
358 | needed_headroom += batadv_max_header_len(); | |
359 | ||
360 | soft_iface->needed_headroom = needed_headroom; | |
361 | soft_iface->needed_tailroom = lower_tailroom; | |
362 | } | |
363 | ||
9563877e | 364 | int batadv_hardif_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 365 | { |
a19d3d85 | 366 | struct batadv_priv *bat_priv = netdev_priv(soft_iface); |
56303d34 | 367 | const struct batadv_hard_iface *hard_iface; |
930cd6e4 | 368 | int min_mtu = INT_MAX; |
c6c8fea2 SE |
369 | |
370 | rcu_read_lock(); | |
3193e8fd | 371 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
e9a4f295 SE |
372 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
373 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
374 | continue; |
375 | ||
e6c10f43 | 376 | if (hard_iface->soft_iface != soft_iface) |
c6c8fea2 SE |
377 | continue; |
378 | ||
a19d3d85 | 379 | min_mtu = min_t(int, hard_iface->net_dev->mtu, min_mtu); |
c6c8fea2 SE |
380 | } |
381 | rcu_read_unlock(); | |
a19d3d85 | 382 | |
a19d3d85 ML |
383 | if (atomic_read(&bat_priv->fragmentation) == 0) |
384 | goto out; | |
385 | ||
386 | /* with fragmentation enabled the maximum size of internally generated | |
387 | * packets such as translation table exchanges or tvlv containers, etc | |
388 | * has to be calculated | |
389 | */ | |
390 | min_mtu = min_t(int, min_mtu, BATADV_FRAG_MAX_FRAG_SIZE); | |
391 | min_mtu -= sizeof(struct batadv_frag_packet); | |
392 | min_mtu *= BATADV_FRAG_MAX_FRAGMENTS; | |
a19d3d85 | 393 | |
c6c8fea2 | 394 | out: |
930cd6e4 AQ |
395 | /* report to the other components the maximum amount of bytes that |
396 | * batman-adv can send over the wire (without considering the payload | |
397 | * overhead). For example, this value is used by TT to compute the | |
398 | * maximum local table table size | |
399 | */ | |
400 | atomic_set(&bat_priv->packet_size_max, min_mtu); | |
401 | ||
402 | /* the real soft-interface MTU is computed by removing the payload | |
403 | * overhead from the maximum amount of bytes that was just computed. | |
404 | * | |
405 | * However batman-adv does not support MTUs bigger than ETH_DATA_LEN | |
406 | */ | |
407 | return min_t(int, min_mtu - batadv_max_header_len(), ETH_DATA_LEN); | |
c6c8fea2 SE |
408 | } |
409 | ||
410 | /* adjusts the MTU if a new interface with a smaller MTU appeared. */ | |
9563877e | 411 | void batadv_update_min_mtu(struct net_device *soft_iface) |
c6c8fea2 | 412 | { |
a19d3d85 | 413 | soft_iface->mtu = batadv_hardif_min_mtu(soft_iface); |
c6c8fea2 | 414 | |
a19d3d85 ML |
415 | /* Check if the local translate table should be cleaned up to match a |
416 | * new (and smaller) MTU. | |
417 | */ | |
418 | batadv_tt_local_resize_to_mtu(soft_iface); | |
c6c8fea2 SE |
419 | } |
420 | ||
56303d34 SE |
421 | static void |
422 | batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 423 | { |
56303d34 SE |
424 | struct batadv_priv *bat_priv; |
425 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 426 | |
e9a4f295 | 427 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 428 | goto out; |
c6c8fea2 | 429 | |
e6c10f43 | 430 | bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 431 | |
29824a55 | 432 | bat_priv->algo_ops->iface.update_mac(hard_iface); |
e9a4f295 | 433 | hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED; |
c6c8fea2 | 434 | |
9cfc7bd6 | 435 | /* the first active interface becomes our primary interface or |
015758d0 | 436 | * the next active interface after the old primary interface was removed |
c6c8fea2 | 437 | */ |
e5d89254 | 438 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 439 | if (!primary_if) |
18a1cb6e | 440 | batadv_primary_if_select(bat_priv, hard_iface); |
c6c8fea2 | 441 | |
3e34819e SE |
442 | batadv_info(hard_iface->soft_iface, "Interface activated: %s\n", |
443 | hard_iface->net_dev->name); | |
c6c8fea2 | 444 | |
9563877e | 445 | batadv_update_min_mtu(hard_iface->soft_iface); |
32ae9b22 | 446 | |
29824a55 AQ |
447 | if (bat_priv->algo_ops->iface.activate) |
448 | bat_priv->algo_ops->iface.activate(hard_iface); | |
b6cf5d49 | 449 | |
32ae9b22 ML |
450 | out: |
451 | if (primary_if) | |
82047ad7 | 452 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
453 | } |
454 | ||
56303d34 SE |
455 | static void |
456 | batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) | |
c6c8fea2 | 457 | { |
e9a4f295 SE |
458 | if ((hard_iface->if_status != BATADV_IF_ACTIVE) && |
459 | (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED)) | |
c6c8fea2 SE |
460 | return; |
461 | ||
e9a4f295 | 462 | hard_iface->if_status = BATADV_IF_INACTIVE; |
c6c8fea2 | 463 | |
3e34819e SE |
464 | batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n", |
465 | hard_iface->net_dev->name); | |
c6c8fea2 | 466 | |
9563877e | 467 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
468 | } |
469 | ||
cb4b0d48 AQ |
470 | /** |
471 | * batadv_master_del_slave - remove hard_iface from the current master interface | |
472 | * @slave: the interface enslaved in another master | |
473 | * @master: the master from which slave has to be removed | |
474 | * | |
475 | * Invoke ndo_del_slave on master passing slave as argument. In this way slave | |
476 | * is free'd and master can correctly change its internal state. | |
62fe710f SE |
477 | * |
478 | * Return: 0 on success, a negative value representing the error otherwise | |
cb4b0d48 AQ |
479 | */ |
480 | static int batadv_master_del_slave(struct batadv_hard_iface *slave, | |
481 | struct net_device *master) | |
482 | { | |
483 | int ret; | |
484 | ||
485 | if (!master) | |
486 | return 0; | |
487 | ||
488 | ret = -EBUSY; | |
489 | if (master->netdev_ops->ndo_del_slave) | |
490 | ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev); | |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
56303d34 | 495 | int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, |
2cd45a06 | 496 | struct net *net, const char *iface_name) |
c6c8fea2 | 497 | { |
56303d34 | 498 | struct batadv_priv *bat_priv; |
cb4b0d48 | 499 | struct net_device *soft_iface, *master; |
293e9338 | 500 | __be16 ethertype = htons(ETH_P_BATMAN); |
411d6ed9 | 501 | int max_header_len = batadv_max_header_len(); |
e44d8fe2 | 502 | int ret; |
c6c8fea2 | 503 | |
e9a4f295 | 504 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
505 | goto out; |
506 | ||
17a86915 | 507 | kref_get(&hard_iface->refcount); |
ed75ccbe | 508 | |
2cd45a06 | 509 | soft_iface = dev_get_by_name(net, iface_name); |
c6c8fea2 | 510 | |
e44d8fe2 | 511 | if (!soft_iface) { |
2cd45a06 | 512 | soft_iface = batadv_softif_create(net, iface_name); |
c6c8fea2 | 513 | |
e44d8fe2 SE |
514 | if (!soft_iface) { |
515 | ret = -ENOMEM; | |
c6c8fea2 | 516 | goto err; |
e44d8fe2 | 517 | } |
c6c8fea2 SE |
518 | |
519 | /* dev_get_by_name() increases the reference counter for us */ | |
e44d8fe2 SE |
520 | dev_hold(soft_iface); |
521 | } | |
522 | ||
04b482a2 | 523 | if (!batadv_softif_is_valid(soft_iface)) { |
86ceb360 | 524 | pr_err("Can't create batman mesh interface %s: already exists as regular interface\n", |
e44d8fe2 | 525 | soft_iface->name); |
e44d8fe2 | 526 | ret = -EINVAL; |
77af7575 | 527 | goto err_dev; |
c6c8fea2 SE |
528 | } |
529 | ||
cb4b0d48 AQ |
530 | /* check if the interface is enslaved in another virtual one and |
531 | * in that case unlink it first | |
532 | */ | |
533 | master = netdev_master_upper_dev_get(hard_iface->net_dev); | |
534 | ret = batadv_master_del_slave(hard_iface, master); | |
535 | if (ret) | |
536 | goto err_dev; | |
537 | ||
e44d8fe2 | 538 | hard_iface->soft_iface = soft_iface; |
e6c10f43 | 539 | bat_priv = netdev_priv(hard_iface->soft_iface); |
d0b9fd89 | 540 | |
6dffb044 | 541 | ret = netdev_master_upper_dev_link(hard_iface->net_dev, |
29bf24af | 542 | soft_iface, NULL, NULL); |
3dbd550b SE |
543 | if (ret) |
544 | goto err_dev; | |
545 | ||
29824a55 | 546 | ret = bat_priv->algo_ops->iface.enable(hard_iface); |
5346c35e | 547 | if (ret < 0) |
3dbd550b | 548 | goto err_upper; |
c6c8fea2 | 549 | |
e6c10f43 | 550 | hard_iface->if_num = bat_priv->num_ifaces; |
c6c8fea2 | 551 | bat_priv->num_ifaces++; |
e9a4f295 | 552 | hard_iface->if_status = BATADV_IF_INACTIVE; |
62446307 SW |
553 | ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces); |
554 | if (ret < 0) { | |
29824a55 | 555 | bat_priv->algo_ops->iface.disable(hard_iface); |
62446307 SW |
556 | bat_priv->num_ifaces--; |
557 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; | |
3dbd550b | 558 | goto err_upper; |
62446307 | 559 | } |
c6c8fea2 | 560 | |
d7d6de95 | 561 | kref_get(&hard_iface->refcount); |
7e071c79 | 562 | hard_iface->batman_adv_ptype.type = ethertype; |
3193e8fd | 563 | hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv; |
e6c10f43 ML |
564 | hard_iface->batman_adv_ptype.dev = hard_iface->net_dev; |
565 | dev_add_pack(&hard_iface->batman_adv_ptype); | |
c6c8fea2 | 566 | |
3e34819e SE |
567 | batadv_info(hard_iface->soft_iface, "Adding interface: %s\n", |
568 | hard_iface->net_dev->name); | |
c6c8fea2 | 569 | |
0aca2369 | 570 | if (atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 571 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 572 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 573 | "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 | 574 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 575 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 576 | |
0aca2369 | 577 | if (!atomic_read(&bat_priv->fragmentation) && |
411d6ed9 | 578 | hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len) |
3e34819e | 579 | batadv_info(hard_iface->soft_iface, |
411d6ed9 | 580 | "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 | 581 | hard_iface->net_dev->name, hard_iface->net_dev->mtu, |
411d6ed9 | 582 | ETH_DATA_LEN + max_header_len); |
c6c8fea2 | 583 | |
18a1cb6e SE |
584 | if (batadv_hardif_is_iface_up(hard_iface)) |
585 | batadv_hardif_activate_interface(hard_iface); | |
c6c8fea2 | 586 | else |
3e34819e SE |
587 | batadv_err(hard_iface->soft_iface, |
588 | "Not using interface %s (retrying later): interface not active\n", | |
589 | hard_iface->net_dev->name); | |
c6c8fea2 | 590 | |
7bca68c7 SE |
591 | batadv_hardif_recalc_extra_skbroom(soft_iface); |
592 | ||
c6c8fea2 SE |
593 | out: |
594 | return 0; | |
595 | ||
3dbd550b SE |
596 | err_upper: |
597 | netdev_upper_dev_unlink(hard_iface->net_dev, soft_iface); | |
77af7575 | 598 | err_dev: |
3dbd550b | 599 | hard_iface->soft_iface = NULL; |
77af7575 | 600 | dev_put(soft_iface); |
c6c8fea2 | 601 | err: |
82047ad7 | 602 | batadv_hardif_put(hard_iface); |
e44d8fe2 | 603 | return ret; |
c6c8fea2 SE |
604 | } |
605 | ||
a15fd361 SE |
606 | void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, |
607 | enum batadv_hard_if_cleanup autodel) | |
c6c8fea2 | 608 | { |
56303d34 SE |
609 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
610 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 611 | |
f2d23861 | 612 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 | 613 | |
e9a4f295 | 614 | if (hard_iface->if_status != BATADV_IF_INACTIVE) |
32ae9b22 | 615 | goto out; |
c6c8fea2 | 616 | |
3e34819e SE |
617 | batadv_info(hard_iface->soft_iface, "Removing interface: %s\n", |
618 | hard_iface->net_dev->name); | |
e6c10f43 | 619 | dev_remove_pack(&hard_iface->batman_adv_ptype); |
d7d6de95 | 620 | batadv_hardif_put(hard_iface); |
c6c8fea2 SE |
621 | |
622 | bat_priv->num_ifaces--; | |
7d211efc | 623 | batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces); |
c6c8fea2 | 624 | |
e5d89254 | 625 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 626 | if (hard_iface == primary_if) { |
56303d34 | 627 | struct batadv_hard_iface *new_if; |
c6c8fea2 | 628 | |
18a1cb6e SE |
629 | new_if = batadv_hardif_get_active(hard_iface->soft_iface); |
630 | batadv_primary_if_select(bat_priv, new_if); | |
c6c8fea2 SE |
631 | |
632 | if (new_if) | |
82047ad7 | 633 | batadv_hardif_put(new_if); |
c6c8fea2 SE |
634 | } |
635 | ||
29824a55 | 636 | bat_priv->algo_ops->iface.disable(hard_iface); |
e9a4f295 | 637 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
c6c8fea2 | 638 | |
e6c10f43 | 639 | /* delete all references to this hard_iface */ |
7d211efc | 640 | batadv_purge_orig_ref(bat_priv); |
9455e34c | 641 | batadv_purge_outstanding_packets(bat_priv, hard_iface); |
e6c10f43 | 642 | dev_put(hard_iface->soft_iface); |
c6c8fea2 | 643 | |
a5256f7e | 644 | netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface); |
7bca68c7 | 645 | batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface); |
a5256f7e | 646 | |
c6c8fea2 | 647 | /* nobody uses this interface anymore */ |
8257f55a AQ |
648 | if (!bat_priv->num_ifaces) { |
649 | batadv_gw_check_client_stop(bat_priv); | |
650 | ||
651 | if (autodel == BATADV_IF_CLEANUP_AUTO) | |
652 | batadv_softif_destroy_sysfs(hard_iface->soft_iface); | |
653 | } | |
c6c8fea2 | 654 | |
e6c10f43 | 655 | hard_iface->soft_iface = NULL; |
82047ad7 | 656 | batadv_hardif_put(hard_iface); |
32ae9b22 ML |
657 | |
658 | out: | |
659 | if (primary_if) | |
82047ad7 | 660 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
661 | } |
662 | ||
56303d34 | 663 | static struct batadv_hard_iface * |
18a1cb6e | 664 | batadv_hardif_add_interface(struct net_device *net_dev) |
c6c8fea2 | 665 | { |
56303d34 | 666 | struct batadv_hard_iface *hard_iface; |
c6c8fea2 SE |
667 | int ret; |
668 | ||
c3caf519 SE |
669 | ASSERT_RTNL(); |
670 | ||
4b426b10 | 671 | if (!batadv_is_valid_iface(net_dev)) |
c6c8fea2 SE |
672 | goto out; |
673 | ||
674 | dev_hold(net_dev); | |
675 | ||
7db3fc29 | 676 | hard_iface = kzalloc(sizeof(*hard_iface), GFP_ATOMIC); |
320f422f | 677 | if (!hard_iface) |
c6c8fea2 | 678 | goto release_dev; |
c6c8fea2 | 679 | |
5853e22c | 680 | ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev); |
c6c8fea2 SE |
681 | if (ret) |
682 | goto free_if; | |
683 | ||
e6c10f43 ML |
684 | hard_iface->if_num = -1; |
685 | hard_iface->net_dev = net_dev; | |
686 | hard_iface->soft_iface = NULL; | |
e9a4f295 | 687 | hard_iface->if_status = BATADV_IF_NOT_IN_USE; |
5bc7c1eb SW |
688 | |
689 | ret = batadv_debugfs_add_hardif(hard_iface); | |
690 | if (ret) | |
691 | goto free_sysfs; | |
692 | ||
e6c10f43 | 693 | INIT_LIST_HEAD(&hard_iface->list); |
cef63419 | 694 | INIT_HLIST_HEAD(&hard_iface->neigh_list); |
5bc44dc8 | 695 | |
cef63419 | 696 | spin_lock_init(&hard_iface->neigh_list_lock); |
b2367e46 | 697 | kref_init(&hard_iface->refcount); |
cef63419 | 698 | |
caf65bfc MS |
699 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT; |
700 | if (batadv_is_wifi_netdev(net_dev)) | |
701 | hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; | |
702 | ||
7db682d1 ML |
703 | batadv_v_hardif_init(hard_iface); |
704 | ||
18a1cb6e | 705 | batadv_check_known_mac_addr(hard_iface->net_dev); |
b2367e46 | 706 | kref_get(&hard_iface->refcount); |
3193e8fd | 707 | list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); |
c6c8fea2 | 708 | |
e6c10f43 | 709 | return hard_iface; |
c6c8fea2 | 710 | |
5bc7c1eb SW |
711 | free_sysfs: |
712 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
c6c8fea2 | 713 | free_if: |
e6c10f43 | 714 | kfree(hard_iface); |
c6c8fea2 SE |
715 | release_dev: |
716 | dev_put(net_dev); | |
717 | out: | |
718 | return NULL; | |
719 | } | |
720 | ||
56303d34 | 721 | static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 722 | { |
c3caf519 SE |
723 | ASSERT_RTNL(); |
724 | ||
c6c8fea2 | 725 | /* first deactivate interface */ |
e9a4f295 | 726 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
a15fd361 | 727 | batadv_hardif_disable_interface(hard_iface, |
06d640c9 | 728 | BATADV_IF_CLEANUP_KEEP); |
c6c8fea2 | 729 | |
e9a4f295 | 730 | if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
731 | return; |
732 | ||
e9a4f295 | 733 | hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; |
569c9850 SE |
734 | batadv_debugfs_del_hardif(hard_iface); |
735 | batadv_sysfs_del_hardif(&hard_iface->hardif_obj); | |
736 | batadv_hardif_put(hard_iface); | |
c6c8fea2 SE |
737 | } |
738 | ||
9563877e | 739 | void batadv_hardif_remove_interfaces(void) |
c6c8fea2 | 740 | { |
56303d34 | 741 | struct batadv_hard_iface *hard_iface, *hard_iface_tmp; |
c6c8fea2 | 742 | |
c3caf519 | 743 | rtnl_lock(); |
e6c10f43 | 744 | list_for_each_entry_safe(hard_iface, hard_iface_tmp, |
3193e8fd | 745 | &batadv_hardif_list, list) { |
e6c10f43 | 746 | list_del_rcu(&hard_iface->list); |
18a1cb6e | 747 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
748 | } |
749 | rtnl_unlock(); | |
750 | } | |
751 | ||
18a1cb6e SE |
752 | static int batadv_hard_if_event(struct notifier_block *this, |
753 | unsigned long event, void *ptr) | |
c6c8fea2 | 754 | { |
351638e7 | 755 | struct net_device *net_dev = netdev_notifier_info_to_dev(ptr); |
56303d34 SE |
756 | struct batadv_hard_iface *hard_iface; |
757 | struct batadv_hard_iface *primary_if = NULL; | |
758 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 759 | |
37130293 SE |
760 | if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) { |
761 | batadv_sysfs_add_meshif(net_dev); | |
5d2c05b2 AQ |
762 | bat_priv = netdev_priv(net_dev); |
763 | batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS); | |
37130293 SE |
764 | return NOTIFY_DONE; |
765 | } | |
766 | ||
56303d34 | 767 | hard_iface = batadv_hardif_get_by_netdev(net_dev); |
a1a66b11 AL |
768 | if (!hard_iface && (event == NETDEV_REGISTER || |
769 | event == NETDEV_POST_TYPE_CHANGE)) | |
18a1cb6e | 770 | hard_iface = batadv_hardif_add_interface(net_dev); |
c6c8fea2 | 771 | |
e6c10f43 | 772 | if (!hard_iface) |
c6c8fea2 SE |
773 | goto out; |
774 | ||
775 | switch (event) { | |
776 | case NETDEV_UP: | |
18a1cb6e | 777 | batadv_hardif_activate_interface(hard_iface); |
c6c8fea2 SE |
778 | break; |
779 | case NETDEV_GOING_DOWN: | |
780 | case NETDEV_DOWN: | |
18a1cb6e | 781 | batadv_hardif_deactivate_interface(hard_iface); |
c6c8fea2 SE |
782 | break; |
783 | case NETDEV_UNREGISTER: | |
a1a66b11 | 784 | case NETDEV_PRE_TYPE_CHANGE: |
e6c10f43 | 785 | list_del_rcu(&hard_iface->list); |
c6c8fea2 | 786 | |
18a1cb6e | 787 | batadv_hardif_remove_interface(hard_iface); |
c6c8fea2 SE |
788 | break; |
789 | case NETDEV_CHANGEMTU: | |
e6c10f43 | 790 | if (hard_iface->soft_iface) |
9563877e | 791 | batadv_update_min_mtu(hard_iface->soft_iface); |
c6c8fea2 SE |
792 | break; |
793 | case NETDEV_CHANGEADDR: | |
e9a4f295 | 794 | if (hard_iface->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
795 | goto hardif_put; |
796 | ||
18a1cb6e | 797 | batadv_check_known_mac_addr(hard_iface->net_dev); |
c6c8fea2 | 798 | |
e6c10f43 | 799 | bat_priv = netdev_priv(hard_iface->soft_iface); |
29824a55 | 800 | bat_priv->algo_ops->iface.update_mac(hard_iface); |
01c4224b | 801 | |
e5d89254 | 802 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
803 | if (!primary_if) |
804 | goto hardif_put; | |
805 | ||
806 | if (hard_iface == primary_if) | |
18a1cb6e | 807 | batadv_primary_if_update_addr(bat_priv, NULL); |
c6c8fea2 SE |
808 | break; |
809 | default: | |
810 | break; | |
f81c6224 | 811 | } |
c6c8fea2 SE |
812 | |
813 | hardif_put: | |
82047ad7 | 814 | batadv_hardif_put(hard_iface); |
c6c8fea2 | 815 | out: |
32ae9b22 | 816 | if (primary_if) |
82047ad7 | 817 | batadv_hardif_put(primary_if); |
c6c8fea2 SE |
818 | return NOTIFY_DONE; |
819 | } | |
820 | ||
9563877e | 821 | struct notifier_block batadv_hard_if_notifier = { |
18a1cb6e | 822 | .notifier_call = batadv_hard_if_event, |
c6c8fea2 | 823 | }; |