Antonio Quartulli | 0b87393 | 2013-01-04 03:05:31 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2009-2013 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 2 | * |
| 3 | * Marek Lindner |
| 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 Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include "main.h" |
Sven Eckelmann | b706b13 | 2012-06-10 23:58:51 +0200 | [diff] [blame] | 21 | #include "sysfs.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 22 | #include "gateway_client.h" |
| 23 | #include "gateway_common.h" |
| 24 | #include "hard-interface.h" |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 25 | #include "originator.h" |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 26 | #include "translation-table.h" |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 27 | #include "routing.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 28 | #include <linux/ip.h> |
| 29 | #include <linux/ipv6.h> |
| 30 | #include <linux/udp.h> |
| 31 | #include <linux/if_vlan.h> |
| 32 | |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 33 | /* This is the offset of the options field in a dhcp packet starting at |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 34 | * the beginning of the dhcp header |
| 35 | */ |
Sven Eckelmann | 347c80f | 2012-06-03 22:19:07 +0200 | [diff] [blame] | 36 | #define BATADV_DHCP_OPTIONS_OFFSET 240 |
| 37 | #define BATADV_DHCP_REQUEST 3 |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 38 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 39 | static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 40 | { |
| 41 | if (atomic_dec_and_test(&gw_node->refcount)) |
Paul E. McKenney | eb340b2 | 2011-05-01 23:25:02 -0700 | [diff] [blame] | 42 | kfree_rcu(gw_node, rcu); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 43 | } |
| 44 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 45 | static struct batadv_gw_node * |
| 46 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 47 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 48 | struct batadv_gw_node *gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 49 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 50 | rcu_read_lock(); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 51 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 52 | if (!gw_node) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 53 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 54 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 55 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 56 | gw_node = NULL; |
| 57 | |
| 58 | out: |
| 59 | rcu_read_unlock(); |
| 60 | return gw_node; |
| 61 | } |
| 62 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 63 | struct batadv_orig_node * |
| 64 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 65 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 66 | struct batadv_gw_node *gw_node; |
| 67 | struct batadv_orig_node *orig_node = NULL; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 68 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 69 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 70 | if (!gw_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 71 | goto out; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 72 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 73 | rcu_read_lock(); |
| 74 | orig_node = gw_node->orig_node; |
| 75 | if (!orig_node) |
| 76 | goto unlock; |
| 77 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 78 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
| 79 | orig_node = NULL; |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 80 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 81 | unlock: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 82 | rcu_read_unlock(); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 83 | out: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 84 | if (gw_node) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 85 | batadv_gw_node_free_ref(gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 86 | return orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 87 | } |
| 88 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 89 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
| 90 | struct batadv_gw_node *new_gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 91 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 92 | struct batadv_gw_node *curr_gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 93 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 94 | spin_lock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 95 | |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 96 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
| 97 | new_gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 98 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 99 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
| 100 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 101 | |
| 102 | if (curr_gw_node) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 103 | batadv_gw_node_free_ref(curr_gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 104 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 105 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 106 | } |
| 107 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 108 | void batadv_gw_deselect(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 109 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 110 | atomic_set(&bat_priv->gw.reselect, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 111 | } |
| 112 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 113 | static struct batadv_gw_node * |
| 114 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 115 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 116 | struct batadv_neigh_node *router; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 117 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 118 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 119 | uint32_t gw_divisor; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 120 | uint8_t max_tq = 0; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 121 | uint8_t tq_avg; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 122 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 123 | |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 124 | gw_divisor = BATADV_TQ_LOCAL_WINDOW_SIZE * BATADV_TQ_LOCAL_WINDOW_SIZE; |
| 125 | gw_divisor *= 64; |
| 126 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 127 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 128 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 129 | if (gw_node->deleted) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 130 | continue; |
| 131 | |
Sven Eckelmann | 84d5e5e | 2012-05-12 02:09:30 +0200 | [diff] [blame] | 132 | orig_node = gw_node->orig_node; |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 133 | router = batadv_orig_node_get_router(orig_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 134 | if (!router) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 135 | continue; |
| 136 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 137 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 138 | goto next; |
| 139 | |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 140 | tq_avg = router->tq_avg; |
| 141 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 142 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
| 143 | case 1: /* fast connection */ |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 144 | tmp_gw_factor = tq_avg * tq_avg; |
| 145 | tmp_gw_factor *= gw_node->bandwidth_down; |
| 146 | tmp_gw_factor *= 100 * 100; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 147 | tmp_gw_factor /= gw_divisor; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 148 | |
| 149 | if ((tmp_gw_factor > max_gw_factor) || |
| 150 | ((tmp_gw_factor == max_gw_factor) && |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 151 | (tq_avg > max_tq))) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 152 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 153 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 154 | curr_gw = gw_node; |
| 155 | atomic_inc(&curr_gw->refcount); |
| 156 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 157 | break; |
| 158 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 159 | default: /* 2: stable connection (use best statistic) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 160 | * 3: fast-switch (use best statistic but change as |
| 161 | * soon as a better gateway appears) |
| 162 | * XX: late-switch (use best statistic but change as |
| 163 | * soon as a better gateway appears which has |
| 164 | * $routing_class more tq points) |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 165 | */ |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 166 | if (tq_avg > max_tq) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 167 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 168 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 169 | curr_gw = gw_node; |
| 170 | atomic_inc(&curr_gw->refcount); |
| 171 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 172 | break; |
| 173 | } |
| 174 | |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 175 | if (tq_avg > max_tq) |
| 176 | max_tq = tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 177 | |
| 178 | if (tmp_gw_factor > max_gw_factor) |
| 179 | max_gw_factor = tmp_gw_factor; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 180 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 181 | batadv_gw_node_free_ref(gw_node); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 182 | |
| 183 | next: |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 184 | batadv_neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 185 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 186 | rcu_read_unlock(); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 187 | |
| 188 | return curr_gw; |
| 189 | } |
| 190 | |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 191 | /** |
| 192 | * batadv_gw_check_client_stop - check if client mode has been switched off |
| 193 | * @bat_priv: the bat priv with all the soft interface information |
| 194 | * |
| 195 | * This function assumes the caller has checked that the gw state *is actually |
| 196 | * changing*. This function is not supposed to be called when there is no state |
| 197 | * change. |
| 198 | */ |
| 199 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) |
| 200 | { |
| 201 | struct batadv_gw_node *curr_gw; |
| 202 | |
| 203 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
| 204 | return; |
| 205 | |
| 206 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 207 | if (!curr_gw) |
| 208 | return; |
| 209 | |
| 210 | /* if batman-adv is switching the gw client mode off and a gateway was |
| 211 | * already selected, send a DEL uevent |
| 212 | */ |
| 213 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); |
| 214 | |
| 215 | batadv_gw_node_free_ref(curr_gw); |
| 216 | } |
| 217 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 218 | void batadv_gw_election(struct batadv_priv *bat_priv) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 219 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 220 | struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; |
| 221 | struct batadv_neigh_node *router = NULL; |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 222 | char gw_addr[18] = { '\0' }; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 223 | |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 224 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 225 | goto out; |
| 226 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 227 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 228 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 229 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
Marek Lindner | caa0bf6 | 2012-08-04 04:13:26 +0000 | [diff] [blame] | 230 | goto out; |
| 231 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 232 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 233 | |
| 234 | if (curr_gw == next_gw) |
| 235 | goto out; |
| 236 | |
| 237 | if (next_gw) { |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 238 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
| 239 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 240 | router = batadv_orig_node_get_router(next_gw->orig_node); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 241 | if (!router) { |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 242 | batadv_gw_deselect(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 243 | goto out; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if ((curr_gw) && (!next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 248 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 249 | "Removing selected gateway - no gateway in range\n"); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 250 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
| 251 | NULL); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 252 | } else if ((!curr_gw) && (next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 253 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 254 | "Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 255 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 256 | next_gw->bandwidth_down / 10, |
| 257 | next_gw->bandwidth_down % 10, |
| 258 | next_gw->bandwidth_up / 10, |
| 259 | next_gw->bandwidth_up % 10, router->tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 260 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
| 261 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 262 | } else { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 263 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 264 | "Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n", |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 265 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 266 | next_gw->bandwidth_down / 10, |
| 267 | next_gw->bandwidth_down % 10, |
| 268 | next_gw->bandwidth_up / 10, |
| 269 | next_gw->bandwidth_up % 10, router->tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 270 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
| 271 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 272 | } |
| 273 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 274 | batadv_gw_select(bat_priv, next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 275 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 276 | out: |
| 277 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 278 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 279 | if (next_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 280 | batadv_gw_node_free_ref(next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 281 | if (router) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 282 | batadv_neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 283 | } |
| 284 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 285 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
| 286 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 287 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 288 | struct batadv_orig_node *curr_gw_orig; |
| 289 | struct batadv_neigh_node *router_gw = NULL, *router_orig = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 290 | uint8_t gw_tq_avg, orig_tq_avg; |
| 291 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 292 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 293 | if (!curr_gw_orig) |
| 294 | goto deselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 295 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 296 | router_gw = batadv_orig_node_get_router(curr_gw_orig); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 297 | if (!router_gw) |
| 298 | goto deselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 299 | |
| 300 | /* this node already is the gateway */ |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 301 | if (curr_gw_orig == orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 302 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 303 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 304 | router_orig = batadv_orig_node_get_router(orig_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 305 | if (!router_orig) |
| 306 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 307 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 308 | gw_tq_avg = router_gw->tq_avg; |
| 309 | orig_tq_avg = router_orig->tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 310 | |
| 311 | /* the TQ value has to be better */ |
| 312 | if (orig_tq_avg < gw_tq_avg) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 313 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 314 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 315 | /* if the routing class is greater than 3 the value tells us how much |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 316 | * greater the TQ value of the new gateway must be |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 317 | */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 318 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
| 319 | (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 320 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 321 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 322 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 323 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
| 324 | gw_tq_avg, orig_tq_avg); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 325 | |
| 326 | deselect: |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 327 | batadv_gw_deselect(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 328 | out: |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 329 | if (curr_gw_orig) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 330 | batadv_orig_node_free_ref(curr_gw_orig); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 331 | if (router_gw) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 332 | batadv_neigh_node_free_ref(router_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 333 | if (router_orig) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 334 | batadv_neigh_node_free_ref(router_orig); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 335 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 336 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 337 | } |
| 338 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 339 | /** |
| 340 | * batadv_gw_node_add - add gateway node to list of available gateways |
| 341 | * @bat_priv: the bat priv with all the soft interface information |
| 342 | * @orig_node: originator announcing gateway capabilities |
| 343 | * @gateway: announced bandwidth information |
| 344 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 345 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
| 346 | struct batadv_orig_node *orig_node, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 347 | struct batadv_tvlv_gateway_data *gateway) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 348 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 349 | struct batadv_gw_node *gw_node; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 350 | |
| 351 | if (gateway->bandwidth_down == 0) |
| 352 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 353 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 354 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 355 | if (!gw_node) |
| 356 | return; |
| 357 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 358 | INIT_HLIST_NODE(&gw_node->list); |
| 359 | gw_node->orig_node = orig_node; |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 360 | atomic_set(&gw_node->refcount, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 361 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 362 | spin_lock_bh(&bat_priv->gw.list_lock); |
| 363 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); |
| 364 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 365 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 366 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 367 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
| 368 | orig_node->orig, |
| 369 | ntohl(gateway->bandwidth_down) / 10, |
| 370 | ntohl(gateway->bandwidth_down) % 10, |
| 371 | ntohl(gateway->bandwidth_up) / 10, |
| 372 | ntohl(gateway->bandwidth_up) % 10); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 373 | } |
| 374 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 375 | /** |
| 376 | * batadv_gw_node_get - retrieve gateway node from list of available gateways |
| 377 | * @bat_priv: the bat priv with all the soft interface information |
| 378 | * @orig_node: originator announcing gateway capabilities |
| 379 | * |
| 380 | * Returns gateway node if found or NULL otherwise. |
| 381 | */ |
| 382 | static struct batadv_gw_node * |
| 383 | batadv_gw_node_get(struct batadv_priv *bat_priv, |
| 384 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 385 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 386 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 387 | |
| 388 | rcu_read_lock(); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 389 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
| 390 | if (gw_node_tmp->orig_node != orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 391 | continue; |
| 392 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 393 | if (gw_node_tmp->deleted) |
| 394 | continue; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 395 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 396 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
| 397 | continue; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 398 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 399 | gw_node = gw_node_tmp; |
| 400 | break; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 401 | } |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 402 | rcu_read_unlock(); |
Antonio Quartulli | 71e4aa9 | 2011-04-25 22:44:32 +0200 | [diff] [blame] | 403 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 404 | return gw_node; |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * batadv_gw_node_update - update list of available gateways with changed |
| 409 | * bandwidth information |
| 410 | * @bat_priv: the bat priv with all the soft interface information |
| 411 | * @orig_node: originator announcing gateway capabilities |
| 412 | * @gateway: announced bandwidth information |
| 413 | */ |
| 414 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
| 415 | struct batadv_orig_node *orig_node, |
| 416 | struct batadv_tvlv_gateway_data *gateway) |
| 417 | { |
| 418 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
| 419 | |
| 420 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
| 421 | if (!gw_node) { |
| 422 | batadv_gw_node_add(bat_priv, orig_node, gateway); |
| 423 | goto out; |
| 424 | } |
| 425 | |
| 426 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
| 427 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) |
| 428 | goto out; |
| 429 | |
| 430 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 431 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", |
| 432 | orig_node->orig, |
| 433 | gw_node->bandwidth_down / 10, |
| 434 | gw_node->bandwidth_down % 10, |
| 435 | gw_node->bandwidth_up / 10, |
| 436 | gw_node->bandwidth_up % 10, |
| 437 | ntohl(gateway->bandwidth_down) / 10, |
| 438 | ntohl(gateway->bandwidth_down) % 10, |
| 439 | ntohl(gateway->bandwidth_up) / 10, |
| 440 | ntohl(gateway->bandwidth_up) % 10); |
| 441 | |
| 442 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
| 443 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
| 444 | |
| 445 | gw_node->deleted = 0; |
| 446 | if (ntohl(gateway->bandwidth_down) == 0) { |
| 447 | gw_node->deleted = jiffies; |
| 448 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 449 | "Gateway %pM removed from gateway list\n", |
| 450 | orig_node->orig); |
| 451 | |
| 452 | /* Note: We don't need a NULL check here, since curr_gw never |
| 453 | * gets dereferenced. |
| 454 | */ |
| 455 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 456 | if (gw_node == curr_gw) |
| 457 | batadv_gw_deselect(bat_priv); |
| 458 | } |
| 459 | |
| 460 | out: |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 461 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 462 | batadv_gw_node_free_ref(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 463 | if (gw_node) |
| 464 | batadv_gw_node_free_ref(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 465 | } |
| 466 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 467 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
| 468 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 469 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 470 | struct batadv_tvlv_gateway_data gateway; |
| 471 | |
| 472 | gateway.bandwidth_down = 0; |
| 473 | gateway.bandwidth_up = 0; |
| 474 | |
| 475 | batadv_gw_node_update(bat_priv, orig_node, &gateway); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 476 | } |
| 477 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 478 | void batadv_gw_node_purge(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 479 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 480 | struct batadv_gw_node *gw_node, *curr_gw; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 481 | struct hlist_node *node_tmp; |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 482 | unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
Sven Eckelmann | b4e1705 | 2011-06-15 09:41:37 +0200 | [diff] [blame] | 483 | int do_deselect = 0; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 484 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 485 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 486 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 487 | spin_lock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 488 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 489 | hlist_for_each_entry_safe(gw_node, node_tmp, |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 490 | &bat_priv->gw.list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 491 | if (((!gw_node->deleted) || |
| 492 | (time_before(jiffies, gw_node->deleted + timeout))) && |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 493 | atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 494 | continue; |
| 495 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 496 | if (curr_gw == gw_node) |
| 497 | do_deselect = 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 498 | |
| 499 | hlist_del_rcu(&gw_node->list); |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 500 | batadv_gw_node_free_ref(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 501 | } |
| 502 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 503 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 504 | |
| 505 | /* gw_deselect() needs to acquire the gw_list_lock */ |
| 506 | if (do_deselect) |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 507 | batadv_gw_deselect(bat_priv); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 508 | |
| 509 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 510 | batadv_gw_node_free_ref(curr_gw); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 511 | } |
| 512 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 513 | /* fails if orig_node has no router */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 514 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
| 515 | struct seq_file *seq, |
| 516 | const struct batadv_gw_node *gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 517 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 518 | struct batadv_gw_node *curr_gw; |
| 519 | struct batadv_neigh_node *router; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 520 | int ret = -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 521 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 522 | router = batadv_orig_node_get_router(gw_node->orig_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 523 | if (!router) |
| 524 | goto out; |
| 525 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 526 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 527 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 528 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 529 | (curr_gw == gw_node ? "=>" : " "), |
| 530 | gw_node->orig_node->orig, |
| 531 | router->tq_avg, router->addr, |
| 532 | router->if_incoming->net_dev->name, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 533 | gw_node->bandwidth_down / 10, |
| 534 | gw_node->bandwidth_down % 10, |
| 535 | gw_node->bandwidth_up / 10, |
| 536 | gw_node->bandwidth_up % 10); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 537 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 538 | batadv_neigh_node_free_ref(router); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 539 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 540 | batadv_gw_node_free_ref(curr_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 541 | out: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 542 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 543 | } |
| 544 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 545 | int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 546 | { |
| 547 | struct net_device *net_dev = (struct net_device *)seq->private; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 548 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 549 | struct batadv_hard_iface *primary_if; |
| 550 | struct batadv_gw_node *gw_node; |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 551 | int gw_count = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 552 | |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 553 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 554 | if (!primary_if) |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 555 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 556 | |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 557 | seq_printf(seq, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 558 | " %-12s (%s/%i) %17s [%10s]: advertised uplink bandwidth ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 559 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
| 560 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 561 | primary_if->net_dev->dev_addr, net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 562 | |
| 563 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 564 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 565 | if (gw_node->deleted) |
| 566 | continue; |
| 567 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 568 | /* fails if orig_node has no router */ |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 569 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 570 | continue; |
| 571 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 572 | gw_count++; |
| 573 | } |
| 574 | rcu_read_unlock(); |
| 575 | |
| 576 | if (gw_count == 0) |
Antonio Quartulli | 0c81465 | 2013-03-21 09:23:29 +0100 | [diff] [blame] | 577 | seq_puts(seq, "No gateways in range ...\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 578 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 579 | out: |
| 580 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 581 | batadv_hardif_free_ref(primary_if); |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 582 | return 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 583 | } |
| 584 | |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 585 | /* this call might reallocate skb data */ |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 586 | static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 587 | { |
| 588 | int ret = false; |
| 589 | unsigned char *p; |
| 590 | int pkt_len; |
| 591 | |
| 592 | if (skb_linearize(skb) < 0) |
| 593 | goto out; |
| 594 | |
| 595 | pkt_len = skb_headlen(skb); |
| 596 | |
Sven Eckelmann | 347c80f | 2012-06-03 22:19:07 +0200 | [diff] [blame] | 597 | if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 598 | goto out; |
| 599 | |
Sven Eckelmann | 347c80f | 2012-06-03 22:19:07 +0200 | [diff] [blame] | 600 | p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
| 601 | pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 602 | |
| 603 | /* Access the dhcp option lists. Each entry is made up by: |
Antonio Quartulli | 015758d | 2011-07-09 17:52:13 +0200 | [diff] [blame] | 604 | * - octet 1: option type |
| 605 | * - octet 2: option data len (only if type != 255 and 0) |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 606 | * - octet 3: option data |
| 607 | */ |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 608 | while (*p != 255 && !ret) { |
Antonio Quartulli | 015758d | 2011-07-09 17:52:13 +0200 | [diff] [blame] | 609 | /* p now points to the first octet: option type */ |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 610 | if (*p == 53) { |
| 611 | /* type 53 is the message type option. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 612 | * Jump the len octet and go to the data octet |
| 613 | */ |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 614 | if (pkt_len < 2) |
| 615 | goto out; |
| 616 | p += 2; |
| 617 | |
| 618 | /* check if the message type is what we need */ |
Sven Eckelmann | 347c80f | 2012-06-03 22:19:07 +0200 | [diff] [blame] | 619 | if (*p == BATADV_DHCP_REQUEST) |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 620 | ret = true; |
| 621 | break; |
| 622 | } else if (*p == 0) { |
| 623 | /* option type 0 (padding), just go forward */ |
| 624 | if (pkt_len < 1) |
| 625 | goto out; |
| 626 | pkt_len--; |
| 627 | p++; |
| 628 | } else { |
| 629 | /* This is any other option. So we get the length... */ |
| 630 | if (pkt_len < 1) |
| 631 | goto out; |
| 632 | pkt_len--; |
| 633 | p++; |
| 634 | |
| 635 | /* ...and then we jump over the data */ |
Antonio Quartulli | 9205cc5 | 2012-02-27 11:29:53 +0100 | [diff] [blame] | 636 | if (pkt_len < 1 + (*p)) |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 637 | goto out; |
Antonio Quartulli | 9205cc5 | 2012-02-27 11:29:53 +0100 | [diff] [blame] | 638 | pkt_len -= 1 + (*p); |
| 639 | p += 1 + (*p); |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 640 | } |
| 641 | } |
| 642 | out: |
| 643 | return ret; |
| 644 | } |
| 645 | |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 646 | /* this call might reallocate skb data */ |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 647 | bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 648 | { |
| 649 | struct ethhdr *ethhdr; |
| 650 | struct iphdr *iphdr; |
| 651 | struct ipv6hdr *ipv6hdr; |
| 652 | struct udphdr *udphdr; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 653 | struct vlan_ethhdr *vhdr; |
| 654 | __be16 proto; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 655 | |
| 656 | /* check for ethernet header */ |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 657 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
| 658 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 659 | ethhdr = (struct ethhdr *)skb->data; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 660 | proto = ethhdr->h_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 661 | *header_len += ETH_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 662 | |
| 663 | /* check for initial vlan header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 664 | if (proto == htons(ETH_P_8021Q)) { |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 665 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
| 666 | return false; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 667 | |
| 668 | vhdr = (struct vlan_ethhdr *)skb->data; |
| 669 | proto = vhdr->h_vlan_encapsulated_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 670 | *header_len += VLAN_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | /* check for ip header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 674 | switch (proto) { |
| 675 | case htons(ETH_P_IP): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 676 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
| 677 | return false; |
| 678 | iphdr = (struct iphdr *)(skb->data + *header_len); |
| 679 | *header_len += iphdr->ihl * 4; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 680 | |
| 681 | /* check for udp header */ |
| 682 | if (iphdr->protocol != IPPROTO_UDP) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 683 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 684 | |
| 685 | break; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 686 | case htons(ETH_P_IPV6): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 687 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
| 688 | return false; |
| 689 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
| 690 | *header_len += sizeof(*ipv6hdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 691 | |
| 692 | /* check for udp header */ |
| 693 | if (ipv6hdr->nexthdr != IPPROTO_UDP) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 694 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 695 | |
| 696 | break; |
| 697 | default: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 698 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 699 | } |
| 700 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 701 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
| 702 | return false; |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 703 | |
| 704 | /* skb->data might have been reallocated by pskb_may_pull() */ |
| 705 | ethhdr = (struct ethhdr *)skb->data; |
| 706 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) |
| 707 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
| 708 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 709 | udphdr = (struct udphdr *)(skb->data + *header_len); |
| 710 | *header_len += sizeof(*udphdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 711 | |
| 712 | /* check for bootp port */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 713 | if ((proto == htons(ETH_P_IP)) && |
Antonio Quartulli | 293e933 | 2013-05-19 12:55:16 +0200 | [diff] [blame] | 714 | (udphdr->dest != htons(67))) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 715 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 716 | |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 717 | if ((proto == htons(ETH_P_IPV6)) && |
Antonio Quartulli | 293e933 | 2013-05-19 12:55:16 +0200 | [diff] [blame] | 718 | (udphdr->dest != htons(547))) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 719 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 720 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 721 | return true; |
| 722 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 723 | |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 724 | /** |
| 725 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw |
| 726 | * @bat_priv: the bat priv with all the soft interface information |
| 727 | * @skb: the outgoing packet |
| 728 | * |
| 729 | * Check if the skb is a DHCP request and if it is sent to the current best GW |
| 730 | * server. Due to topology changes it may be the case that the GW server |
| 731 | * previously selected is not the best one anymore. |
| 732 | * |
| 733 | * Returns true if the packet destination is unicast and it is not the best gw, |
| 734 | * false otherwise. |
| 735 | * |
| 736 | * This call might reallocate skb data. |
| 737 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 738 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 739 | struct sk_buff *skb) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 740 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 741 | struct batadv_neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
| 742 | struct batadv_orig_node *orig_dst_node = NULL; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 743 | struct batadv_gw_node *gw_node = NULL, *curr_gw = NULL; |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 744 | struct ethhdr *ethhdr; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 745 | bool ret, out_of_range = false; |
| 746 | unsigned int header_len = 0; |
| 747 | uint8_t curr_tq_avg; |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 748 | unsigned short vid; |
| 749 | |
| 750 | vid = batadv_get_vid(skb, 0); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 751 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 752 | ret = batadv_gw_is_dhcp_target(skb, &header_len); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 753 | if (!ret) |
| 754 | goto out; |
| 755 | |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 756 | ethhdr = (struct ethhdr *)skb->data; |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 757 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 758 | ethhdr->h_dest, vid); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 759 | if (!orig_dst_node) |
| 760 | goto out; |
| 761 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 762 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
| 763 | if (!gw_node->bandwidth_down == 0) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 764 | goto out; |
| 765 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 766 | ret = batadv_is_type_dhcprequest(skb, header_len); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 767 | if (!ret) |
| 768 | goto out; |
| 769 | |
| 770 | switch (atomic_read(&bat_priv->gw_mode)) { |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 771 | case BATADV_GW_MODE_SERVER: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 772 | /* If we are a GW then we are our best GW. We can artificially |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 773 | * set the tq towards ourself as the maximum value |
| 774 | */ |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 775 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 776 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 777 | case BATADV_GW_MODE_CLIENT: |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 778 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 779 | if (!curr_gw) |
| 780 | goto out; |
| 781 | |
| 782 | /* packet is going to our gateway */ |
| 783 | if (curr_gw->orig_node == orig_dst_node) |
| 784 | goto out; |
| 785 | |
| 786 | /* If the dhcp packet has been sent to a different gw, |
| 787 | * we have to evaluate whether the old gw is still |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 788 | * reliable enough |
| 789 | */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 790 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
| 791 | NULL); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 792 | if (!neigh_curr) |
| 793 | goto out; |
| 794 | |
| 795 | curr_tq_avg = neigh_curr->tq_avg; |
| 796 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 797 | case BATADV_GW_MODE_OFF: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 798 | default: |
| 799 | goto out; |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 800 | } |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 801 | |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 802 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
Dan Carpenter | 2ef04f4 | 2011-11-29 09:09:09 +0300 | [diff] [blame] | 803 | if (!neigh_old) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 804 | goto out; |
| 805 | |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 806 | if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 807 | out_of_range = true; |
| 808 | |
| 809 | out: |
| 810 | if (orig_dst_node) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 811 | batadv_orig_node_free_ref(orig_dst_node); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 812 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 813 | batadv_gw_node_free_ref(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 814 | if (gw_node) |
| 815 | batadv_gw_node_free_ref(gw_node); |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 816 | if (neigh_old) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 817 | batadv_neigh_node_free_ref(neigh_old); |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 818 | if (neigh_curr) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 819 | batadv_neigh_node_free_ref(neigh_curr); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 820 | return out_of_range; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 821 | } |