blob: f1d37cd818155ed82b388571a2342afb39509897 [file] [log] [blame]
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
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
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#include "main.h"
Antonio Quartulli785ea112011-11-23 11:35:44 +010021#include "distributed-arp-table.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000022#include "hard-interface.h"
23#include "soft-interface.h"
24#include "send.h"
25#include "translation-table.h"
26#include "routing.h"
Sven Eckelmannb706b132012-06-10 23:58:51 +020027#include "sysfs.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000028#include "originator.h"
29#include "hash.h"
Simon Wunderlich23721382012-01-22 20:00:19 +010030#include "bridge_loop_avoidance.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000031
32#include <linux/if_arp.h>
Antonio Quartulliaf5d4f72012-11-26 00:38:50 +010033#include <linux/if_ether.h>
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000034
Sven Eckelmann95638772012-05-12 02:09:31 +020035void batadv_hardif_free_rcu(struct rcu_head *rcu)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000036{
Sven Eckelmann56303d32012-06-05 22:31:31 +020037 struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000038
Sven Eckelmann56303d32012-06-05 22:31:31 +020039 hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
Marek Lindnere6c10f42011-02-18 12:33:20 +000040 dev_put(hard_iface->net_dev);
41 kfree(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000042}
43
Sven Eckelmann56303d32012-06-05 22:31:31 +020044struct batadv_hard_iface *
45batadv_hardif_get_by_netdev(const struct net_device *net_dev)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000046{
Sven Eckelmann56303d32012-06-05 22:31:31 +020047 struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000048
49 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020050 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Marek Lindnere6c10f42011-02-18 12:33:20 +000051 if (hard_iface->net_dev == net_dev &&
52 atomic_inc_not_zero(&hard_iface->refcount))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000053 goto out;
54 }
55
Marek Lindnere6c10f42011-02-18 12:33:20 +000056 hard_iface = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000057
58out:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000059 rcu_read_unlock();
Marek Lindnere6c10f42011-02-18 12:33:20 +000060 return hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000061}
62
Antonio Quartullib7eddd02012-09-09 10:46:46 +020063/**
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 */
76static 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
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200102static int batadv_is_valid_iface(const struct net_device *net_dev)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000103{
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 */
Antonio Quartullib7eddd02012-09-09 10:46:46 +0200114 if (batadv_is_on_batman_iface(net_dev))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000115 return 0;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000116
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000117 return 1;
118}
119
Sven Eckelmann56303d32012-06-05 22:31:31 +0200120static struct batadv_hard_iface *
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200121batadv_hardif_get_active(const struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000122{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200123 struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000124
125 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200126 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Marek Lindnere6c10f42011-02-18 12:33:20 +0000127 if (hard_iface->soft_iface != soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000128 continue;
129
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200130 if (hard_iface->if_status == BATADV_IF_ACTIVE &&
Marek Lindnere6c10f42011-02-18 12:33:20 +0000131 atomic_inc_not_zero(&hard_iface->refcount))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000132 goto out;
133 }
134
Marek Lindnere6c10f42011-02-18 12:33:20 +0000135 hard_iface = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000136
137out:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000138 rcu_read_unlock();
Marek Lindnere6c10f42011-02-18 12:33:20 +0000139 return hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000140}
141
Sven Eckelmann56303d32012-06-05 22:31:31 +0200142static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
143 struct batadv_hard_iface *oldif)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000144{
Sven Eckelmann96412692012-06-05 22:31:30 +0200145 struct batadv_vis_packet *vis_packet;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200146 struct batadv_hard_iface *primary_if;
Sven Eckelmann807736f2012-07-15 22:26:51 +0200147 struct sk_buff *skb;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200148
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200149 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200150 if (!primary_if)
151 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000152
Antonio Quartulli785ea112011-11-23 11:35:44 +0100153 batadv_dat_init_own_addr(bat_priv, primary_if);
154
Sven Eckelmann807736f2012-07-15 22:26:51 +0200155 skb = bat_priv->vis.my_info->skb_packet;
156 vis_packet = (struct batadv_vis_packet *)skb->data;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200157 memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000158 memcpy(vis_packet->sender_orig,
Marek Lindner32ae9b22011-04-20 15:40:58 +0200159 primary_if->net_dev->dev_addr, ETH_ALEN);
160
Sven Eckelmann08adf152012-05-12 13:38:47 +0200161 batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200162out:
163 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200164 batadv_hardif_free_ref(primary_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000165}
166
Sven Eckelmann56303d32012-06-05 22:31:31 +0200167static void batadv_primary_if_select(struct batadv_priv *bat_priv,
168 struct batadv_hard_iface *new_hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000169{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200170 struct batadv_hard_iface *curr_hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000171
Sven Eckelmannc3caf512011-05-03 11:51:38 +0200172 ASSERT_RTNL();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000173
Marek Lindner32ae9b22011-04-20 15:40:58 +0200174 if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
175 new_hard_iface = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000176
Sven Eckelmann728cbc62011-05-15 00:50:21 +0200177 curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200178 rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000179
Marek Lindner32ae9b22011-04-20 15:40:58 +0200180 if (!new_hard_iface)
Simon Wunderlich23721382012-01-22 20:00:19 +0100181 goto out;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200182
Marek Lindnercd8b78e2012-02-07 17:20:49 +0800183 bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200184 batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
Simon Wunderlich23721382012-01-22 20:00:19 +0100185
186out:
187 if (curr_hard_iface)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200188 batadv_hardif_free_ref(curr_hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000189}
190
Sven Eckelmann56303d32012-06-05 22:31:31 +0200191static bool
192batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000193{
Marek Lindnere6c10f42011-02-18 12:33:20 +0000194 if (hard_iface->net_dev->flags & IFF_UP)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000195 return true;
196
197 return false;
198}
199
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200200static void batadv_check_known_mac_addr(const struct net_device *net_dev)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000201{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200202 const struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000203
204 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200205 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200206 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
207 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000208 continue;
209
Marek Lindnere6c10f42011-02-18 12:33:20 +0000210 if (hard_iface->net_dev == net_dev)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000211 continue;
212
Sven Eckelmann1eda58b2012-05-12 13:48:58 +0200213 if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
214 net_dev->dev_addr))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000215 continue;
216
Sven Eckelmann67969582012-03-26 16:22:45 +0200217 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");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000220 }
221 rcu_read_unlock();
222}
223
Sven Eckelmann95638772012-05-12 02:09:31 +0200224int batadv_hardif_min_mtu(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000225{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200226 const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
227 const struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000228 /* allow big frames if all devices are capable to do so
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200229 * (have MTU > 1500 + BAT_HEADER_LEN)
230 */
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000231 int min_mtu = ETH_DATA_LEN;
232
233 if (atomic_read(&bat_priv->fragmentation))
234 goto out;
235
236 rcu_read_lock();
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200237 list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200238 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
239 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000240 continue;
241
Marek Lindnere6c10f42011-02-18 12:33:20 +0000242 if (hard_iface->soft_iface != soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000243 continue;
244
Sven Eckelmannc11fdfa2012-06-03 22:19:14 +0200245 min_mtu = min_t(int,
246 hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000247 min_mtu);
248 }
249 rcu_read_unlock();
250out:
251 return min_mtu;
252}
253
254/* adjusts the MTU if a new interface with a smaller MTU appeared. */
Sven Eckelmann95638772012-05-12 02:09:31 +0200255void batadv_update_min_mtu(struct net_device *soft_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000256{
257 int min_mtu;
258
Sven Eckelmann95638772012-05-12 02:09:31 +0200259 min_mtu = batadv_hardif_min_mtu(soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000260 if (soft_iface->mtu != min_mtu)
261 soft_iface->mtu = min_mtu;
262}
263
Sven Eckelmann56303d32012-06-05 22:31:31 +0200264static void
265batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000266{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200267 struct batadv_priv *bat_priv;
268 struct batadv_hard_iface *primary_if = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000269
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200270 if (hard_iface->if_status != BATADV_IF_INACTIVE)
Marek Lindner32ae9b22011-04-20 15:40:58 +0200271 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000272
Marek Lindnere6c10f42011-02-18 12:33:20 +0000273 bat_priv = netdev_priv(hard_iface->soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000274
Marek Lindnerc3229392012-03-11 06:17:50 +0800275 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200276 hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000277
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200278 /* the first active interface becomes our primary interface or
Antonio Quartulli015758d2011-07-09 17:52:13 +0200279 * the next active interface after the old primary interface was removed
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000280 */
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200281 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200282 if (!primary_if)
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200283 batadv_primary_if_select(bat_priv, hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000284
Sven Eckelmann3e348192012-05-16 20:23:22 +0200285 batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
286 hard_iface->net_dev->name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000287
Sven Eckelmann95638772012-05-12 02:09:31 +0200288 batadv_update_min_mtu(hard_iface->soft_iface);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200289
290out:
291 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200292 batadv_hardif_free_ref(primary_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000293}
294
Sven Eckelmann56303d32012-06-05 22:31:31 +0200295static void
296batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000297{
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200298 if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
299 (hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000300 return;
301
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200302 hard_iface->if_status = BATADV_IF_INACTIVE;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000303
Sven Eckelmann3e348192012-05-16 20:23:22 +0200304 batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
305 hard_iface->net_dev->name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000306
Sven Eckelmann95638772012-05-12 02:09:31 +0200307 batadv_update_min_mtu(hard_iface->soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000308}
309
Sven Eckelmann56303d32012-06-05 22:31:31 +0200310int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
Sven Eckelmann95638772012-05-12 02:09:31 +0200311 const char *iface_name)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000312{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200313 struct batadv_priv *bat_priv;
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000314 struct net_device *soft_iface;
Antonio Quartulliaf5d4f72012-11-26 00:38:50 +0100315 __be16 ethertype = __constant_htons(ETH_P_BATMAN);
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000316 int ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000317
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200318 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000319 goto out;
320
Marek Lindnere6c10f42011-02-18 12:33:20 +0000321 if (!atomic_inc_not_zero(&hard_iface->refcount))
Marek Lindnered75ccb2011-02-10 14:33:51 +0000322 goto out;
323
Marek Lindner6e242f92011-12-07 18:02:50 +0800324 /* hard-interface is part of a bridge */
325 if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100326 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",
Marek Lindner6e242f92011-12-07 18:02:50 +0800327 hard_iface->net_dev->name);
328
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000329 soft_iface = dev_get_by_name(&init_net, iface_name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000330
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000331 if (!soft_iface) {
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200332 soft_iface = batadv_softif_create(iface_name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000333
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000334 if (!soft_iface) {
335 ret = -ENOMEM;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000336 goto err;
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000337 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000338
339 /* dev_get_by_name() increases the reference counter for us */
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000340 dev_hold(soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000341 }
342
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200343 if (!batadv_softif_is_valid(soft_iface)) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100344 pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000345 soft_iface->name);
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000346 ret = -EINVAL;
Marek Lindner77af7572012-02-07 17:20:48 +0800347 goto err_dev;
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000348 }
349
350 hard_iface->soft_iface = soft_iface;
Marek Lindnere6c10f42011-02-18 12:33:20 +0000351 bat_priv = netdev_priv(hard_iface->soft_iface);
Marek Lindnerd0b9fd82011-07-30 12:33:33 +0200352
Marek Lindner77af7572012-02-07 17:20:48 +0800353 ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200354 if (ret < 0)
Marek Lindner77af7572012-02-07 17:20:48 +0800355 goto err_dev;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000356
Marek Lindnere6c10f42011-02-18 12:33:20 +0000357 hard_iface->if_num = bat_priv->num_ifaces;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000358 bat_priv->num_ifaces++;
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200359 hard_iface->if_status = BATADV_IF_INACTIVE;
Simon Wunderlich62446302012-07-01 22:51:55 +0200360 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 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000367
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200368 hard_iface->batman_adv_ptype.type = ethertype;
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200369 hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
Marek Lindnere6c10f42011-02-18 12:33:20 +0000370 hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
371 dev_add_pack(&hard_iface->batman_adv_ptype);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000372
Marek Lindnere6c10f42011-02-18 12:33:20 +0000373 atomic_set(&hard_iface->frag_seqno, 1);
Sven Eckelmann3e348192012-05-16 20:23:22 +0200374 batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
375 hard_iface->net_dev->name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000376
Sven Eckelmann0aca2362012-06-19 20:26:30 +0200377 if (atomic_read(&bat_priv->fragmentation) &&
378 hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
Sven Eckelmann3e348192012-05-16 20:23:22 +0200379 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,
Sven Eckelmannc11fdfa2012-06-03 22:19:14 +0200382 ETH_DATA_LEN + BATADV_HEADER_LEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000383
Sven Eckelmann0aca2362012-06-19 20:26:30 +0200384 if (!atomic_read(&bat_priv->fragmentation) &&
385 hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
Sven Eckelmann3e348192012-05-16 20:23:22 +0200386 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,
Sven Eckelmannc11fdfa2012-06-03 22:19:14 +0200389 ETH_DATA_LEN + BATADV_HEADER_LEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000390
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200391 if (batadv_hardif_is_iface_up(hard_iface))
392 batadv_hardif_activate_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000393 else
Sven Eckelmann3e348192012-05-16 20:23:22 +0200394 batadv_err(hard_iface->soft_iface,
395 "Not using interface %s (retrying later): interface not active\n",
396 hard_iface->net_dev->name);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000397
398 /* begin scheduling originator messages on that interface */
Sven Eckelmann9455e342012-05-12 02:09:37 +0200399 batadv_schedule_bat_ogm(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000400
401out:
402 return 0;
403
Marek Lindner77af7572012-02-07 17:20:48 +0800404err_dev:
405 dev_put(soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000406err:
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200407 batadv_hardif_free_ref(hard_iface);
Sven Eckelmanne44d8fe2011-03-04 21:36:41 +0000408 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000409}
410
Sven Eckelmann56303d32012-06-05 22:31:31 +0200411void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000412{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200413 struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
414 struct batadv_hard_iface *primary_if = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000415
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200416 if (hard_iface->if_status == BATADV_IF_ACTIVE)
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200417 batadv_hardif_deactivate_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000418
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200419 if (hard_iface->if_status != BATADV_IF_INACTIVE)
Marek Lindner32ae9b22011-04-20 15:40:58 +0200420 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000421
Sven Eckelmann3e348192012-05-16 20:23:22 +0200422 batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
423 hard_iface->net_dev->name);
Marek Lindnere6c10f42011-02-18 12:33:20 +0000424 dev_remove_pack(&hard_iface->batman_adv_ptype);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000425
426 bat_priv->num_ifaces--;
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200427 batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000428
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200429 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200430 if (hard_iface == primary_if) {
Sven Eckelmann56303d32012-06-05 22:31:31 +0200431 struct batadv_hard_iface *new_if;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000432
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200433 new_if = batadv_hardif_get_active(hard_iface->soft_iface);
434 batadv_primary_if_select(bat_priv, new_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000435
436 if (new_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200437 batadv_hardif_free_ref(new_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000438 }
439
Marek Lindner00a50072012-02-07 17:20:47 +0800440 bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200441 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000442
Marek Lindnere6c10f42011-02-18 12:33:20 +0000443 /* delete all references to this hard_iface */
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200444 batadv_purge_orig_ref(bat_priv);
Sven Eckelmann9455e342012-05-12 02:09:37 +0200445 batadv_purge_outstanding_packets(bat_priv, hard_iface);
Marek Lindnere6c10f42011-02-18 12:33:20 +0000446 dev_put(hard_iface->soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000447
448 /* nobody uses this interface anymore */
449 if (!bat_priv->num_ifaces)
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200450 batadv_softif_destroy(hard_iface->soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000451
Marek Lindnere6c10f42011-02-18 12:33:20 +0000452 hard_iface->soft_iface = NULL;
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200453 batadv_hardif_free_ref(hard_iface);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200454
455out:
456 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200457 batadv_hardif_free_ref(primary_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000458}
459
Sven Eckelmann56303d32012-06-05 22:31:31 +0200460static struct batadv_hard_iface *
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200461batadv_hardif_add_interface(struct net_device *net_dev)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000462{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200463 struct batadv_hard_iface *hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000464 int ret;
465
Sven Eckelmannc3caf512011-05-03 11:51:38 +0200466 ASSERT_RTNL();
467
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200468 ret = batadv_is_valid_iface(net_dev);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000469 if (ret != 1)
470 goto out;
471
472 dev_hold(net_dev);
473
Sven Eckelmann704509b2011-05-14 23:14:54 +0200474 hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
Joe Perches320f4222011-08-29 14:17:24 -0700475 if (!hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000476 goto release_dev;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000477
Sven Eckelmann5853e222012-05-12 02:09:24 +0200478 ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000479 if (ret)
480 goto free_if;
481
Marek Lindnere6c10f42011-02-18 12:33:20 +0000482 hard_iface->if_num = -1;
483 hard_iface->net_dev = net_dev;
484 hard_iface->soft_iface = NULL;
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200485 hard_iface->if_status = BATADV_IF_NOT_IN_USE;
Marek Lindnere6c10f42011-02-18 12:33:20 +0000486 INIT_LIST_HEAD(&hard_iface->list);
Marek Lindnered75ccb2011-02-10 14:33:51 +0000487 /* extra reference for return */
Marek Lindnere6c10f42011-02-18 12:33:20 +0000488 atomic_set(&hard_iface->refcount, 2);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000489
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200490 batadv_check_known_mac_addr(hard_iface->net_dev);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200491 list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000492
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200493 /* This can't be called via a bat_priv callback because
Marek Lindner81406252012-02-07 17:19:58 +0800494 * we have no bat_priv yet.
495 */
Marek Lindner14511512012-08-02 17:20:26 +0200496 atomic_set(&hard_iface->bat_iv.ogm_seqno, 1);
497 hard_iface->bat_iv.ogm_buff = NULL;
Marek Lindner81406252012-02-07 17:19:58 +0800498
Marek Lindnere6c10f42011-02-18 12:33:20 +0000499 return hard_iface;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000500
501free_if:
Marek Lindnere6c10f42011-02-18 12:33:20 +0000502 kfree(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000503release_dev:
504 dev_put(net_dev);
505out:
506 return NULL;
507}
508
Sven Eckelmann56303d32012-06-05 22:31:31 +0200509static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000510{
Sven Eckelmannc3caf512011-05-03 11:51:38 +0200511 ASSERT_RTNL();
512
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000513 /* first deactivate interface */
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200514 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
Sven Eckelmann95638772012-05-12 02:09:31 +0200515 batadv_hardif_disable_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000516
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200517 if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000518 return;
519
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200520 hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
Sven Eckelmann5853e222012-05-12 02:09:24 +0200521 batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200522 batadv_hardif_free_ref(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000523}
524
Sven Eckelmann95638772012-05-12 02:09:31 +0200525void batadv_hardif_remove_interfaces(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000526{
Sven Eckelmann56303d32012-06-05 22:31:31 +0200527 struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000528
Sven Eckelmannc3caf512011-05-03 11:51:38 +0200529 rtnl_lock();
Marek Lindnere6c10f42011-02-18 12:33:20 +0000530 list_for_each_entry_safe(hard_iface, hard_iface_tmp,
Sven Eckelmann3193e8f2012-05-12 02:09:42 +0200531 &batadv_hardif_list, list) {
Marek Lindnere6c10f42011-02-18 12:33:20 +0000532 list_del_rcu(&hard_iface->list);
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200533 batadv_hardif_remove_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000534 }
535 rtnl_unlock();
536}
537
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200538static int batadv_hard_if_event(struct notifier_block *this,
539 unsigned long event, void *ptr)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000540{
Sven Eckelmann5f718c22011-05-14 23:14:52 +0200541 struct net_device *net_dev = ptr;
Sven Eckelmann56303d32012-06-05 22:31:31 +0200542 struct batadv_hard_iface *hard_iface;
543 struct batadv_hard_iface *primary_if = NULL;
544 struct batadv_priv *bat_priv;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000545
Sven Eckelmann56303d32012-06-05 22:31:31 +0200546 hard_iface = batadv_hardif_get_by_netdev(net_dev);
Marek Lindnere6c10f42011-02-18 12:33:20 +0000547 if (!hard_iface && event == NETDEV_REGISTER)
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200548 hard_iface = batadv_hardif_add_interface(net_dev);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000549
Marek Lindnere6c10f42011-02-18 12:33:20 +0000550 if (!hard_iface)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000551 goto out;
552
553 switch (event) {
554 case NETDEV_UP:
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200555 batadv_hardif_activate_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000556 break;
557 case NETDEV_GOING_DOWN:
558 case NETDEV_DOWN:
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200559 batadv_hardif_deactivate_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000560 break;
561 case NETDEV_UNREGISTER:
Marek Lindnere6c10f42011-02-18 12:33:20 +0000562 list_del_rcu(&hard_iface->list);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000563
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200564 batadv_hardif_remove_interface(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000565 break;
566 case NETDEV_CHANGEMTU:
Marek Lindnere6c10f42011-02-18 12:33:20 +0000567 if (hard_iface->soft_iface)
Sven Eckelmann95638772012-05-12 02:09:31 +0200568 batadv_update_min_mtu(hard_iface->soft_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000569 break;
570 case NETDEV_CHANGEADDR:
Sven Eckelmanne9a4f292012-06-03 22:19:19 +0200571 if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000572 goto hardif_put;
573
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200574 batadv_check_known_mac_addr(hard_iface->net_dev);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000575
Marek Lindnere6c10f42011-02-18 12:33:20 +0000576 bat_priv = netdev_priv(hard_iface->soft_iface);
Marek Lindnerc3229392012-03-11 06:17:50 +0800577 bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
Marek Lindner01c42242011-11-28 21:31:55 +0800578
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200579 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200580 if (!primary_if)
581 goto hardif_put;
582
583 if (hard_iface == primary_if)
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200584 batadv_primary_if_update_addr(bat_priv, NULL);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000585 break;
586 default:
587 break;
Joe Perchesf81c6222011-06-03 11:51:19 +0000588 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000589
590hardif_put:
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200591 batadv_hardif_free_ref(hard_iface);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000592out:
Marek Lindner32ae9b22011-04-20 15:40:58 +0200593 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200594 batadv_hardif_free_ref(primary_if);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000595 return NOTIFY_DONE;
596}
597
Antonio Quartullibc279082011-07-07 15:35:35 +0200598/* This function returns true if the interface represented by ifindex is a
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200599 * 802.11 wireless device
600 */
Sven Eckelmann95638772012-05-12 02:09:31 +0200601bool batadv_is_wifi_iface(int ifindex)
Antonio Quartullibc279082011-07-07 15:35:35 +0200602{
603 struct net_device *net_device = NULL;
604 bool ret = false;
605
Sven Eckelmann42d0b042012-06-03 22:19:17 +0200606 if (ifindex == BATADV_NULL_IFINDEX)
Antonio Quartullibc279082011-07-07 15:35:35 +0200607 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
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200615 * check for wireless_handlers != NULL
616 */
Antonio Quartullibc279082011-07-07 15:35:35 +0200617 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;
624out:
625 if (net_device)
626 dev_put(net_device);
627 return ret;
628}
629
Sven Eckelmann95638772012-05-12 02:09:31 +0200630struct notifier_block batadv_hard_if_notifier = {
Sven Eckelmann18a1cb62012-05-12 18:33:57 +0200631 .notifier_call = batadv_hard_if_event,
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000632};