Sven Eckelmann | 9f6446c | 2015-04-23 13:16:35 +0200 | [diff] [blame] | 1 | /* Copyright (C) 2009-2015 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 |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 18 | #include "gateway_client.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 19 | #include "main.h" |
| 20 | |
| 21 | #include <linux/atomic.h> |
| 22 | #include <linux/byteorder/generic.h> |
| 23 | #include <linux/etherdevice.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/if_ether.h> |
| 26 | #include <linux/if_vlan.h> |
| 27 | #include <linux/in.h> |
| 28 | #include <linux/ip.h> |
| 29 | #include <linux/ipv6.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 30 | #include <linux/kernel.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <linux/netdevice.h> |
| 33 | #include <linux/rculist.h> |
| 34 | #include <linux/rcupdate.h> |
| 35 | #include <linux/seq_file.h> |
| 36 | #include <linux/skbuff.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/spinlock.h> |
| 39 | #include <linux/stddef.h> |
| 40 | #include <linux/udp.h> |
| 41 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 42 | #include "gateway_common.h" |
| 43 | #include "hard-interface.h" |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 44 | #include "originator.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 45 | #include "packet.h" |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 46 | #include "routing.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 47 | #include "sysfs.h" |
| 48 | #include "translation-table.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 49 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 50 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
| 51 | * packet starting at the beginning of the dhcp header |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 52 | */ |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 53 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
| 54 | #define BATADV_DHCP_HLEN_OFFSET 2 |
| 55 | /* Value of htype representing Ethernet */ |
| 56 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 |
| 57 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the |
| 58 | * beginning of the dhcp header |
| 59 | */ |
| 60 | #define BATADV_DHCP_CHADDR_OFFSET 28 |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 61 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 62 | 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] | 63 | { |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 64 | if (atomic_dec_and_test(&gw_node->refcount)) { |
| 65 | batadv_orig_node_free_ref(gw_node->orig_node); |
Paul E. McKenney | eb340b2 | 2011-05-01 23:25:02 -0700 | [diff] [blame] | 66 | kfree_rcu(gw_node, rcu); |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 67 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 68 | } |
| 69 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 70 | static struct batadv_gw_node * |
| 71 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 72 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 73 | struct batadv_gw_node *gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 74 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 75 | rcu_read_lock(); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 76 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 77 | if (!gw_node) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 78 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 79 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 80 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 81 | gw_node = NULL; |
| 82 | |
| 83 | out: |
| 84 | rcu_read_unlock(); |
| 85 | return gw_node; |
| 86 | } |
| 87 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 88 | struct batadv_orig_node * |
| 89 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 90 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 91 | struct batadv_gw_node *gw_node; |
| 92 | struct batadv_orig_node *orig_node = NULL; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 93 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 94 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 95 | if (!gw_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 96 | goto out; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 97 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 98 | rcu_read_lock(); |
| 99 | orig_node = gw_node->orig_node; |
| 100 | if (!orig_node) |
| 101 | goto unlock; |
| 102 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 103 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
| 104 | orig_node = NULL; |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 105 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 106 | unlock: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 107 | rcu_read_unlock(); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 108 | out: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 109 | if (gw_node) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 110 | batadv_gw_node_free_ref(gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 111 | return orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 112 | } |
| 113 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 114 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
| 115 | struct batadv_gw_node *new_gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 116 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 117 | struct batadv_gw_node *curr_gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 118 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 119 | spin_lock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 120 | |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 121 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
| 122 | new_gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 123 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 124 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
| 125 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 126 | |
| 127 | if (curr_gw_node) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 128 | batadv_gw_node_free_ref(curr_gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 129 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 130 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 131 | } |
| 132 | |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 133 | /** |
| 134 | * batadv_gw_reselect - force a gateway reselection |
| 135 | * @bat_priv: the bat priv with all the soft interface information |
| 136 | * |
| 137 | * Set a flag to remind the GW component to perform a new gateway reselection. |
| 138 | * However this function does not ensure that the current gateway is going to be |
| 139 | * deselected. The reselection mechanism may elect the same gateway once again. |
| 140 | * |
| 141 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway |
| 142 | * change and therefore a uevent is not necessarily expected. |
| 143 | */ |
| 144 | void batadv_gw_reselect(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 145 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 146 | atomic_set(&bat_priv->gw.reselect, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 147 | } |
| 148 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 149 | static struct batadv_gw_node * |
| 150 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 151 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 152 | struct batadv_neigh_node *router; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 153 | struct batadv_neigh_ifinfo *router_ifinfo; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 154 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 155 | u64 max_gw_factor = 0; |
| 156 | u64 tmp_gw_factor = 0; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 157 | u8 max_tq = 0; |
| 158 | u8 tq_avg; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 159 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 160 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 161 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 162 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Sven Eckelmann | 84d5e5e | 2012-05-12 02:09:30 +0200 | [diff] [blame] | 163 | orig_node = gw_node->orig_node; |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 164 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 165 | if (!router) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 166 | continue; |
| 167 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 168 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
| 169 | BATADV_IF_DEFAULT); |
| 170 | if (!router_ifinfo) |
| 171 | goto next; |
| 172 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 173 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 174 | goto next; |
| 175 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 176 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 177 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 178 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
| 179 | case 1: /* fast connection */ |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 180 | tmp_gw_factor = tq_avg * tq_avg; |
| 181 | tmp_gw_factor *= gw_node->bandwidth_down; |
| 182 | tmp_gw_factor *= 100 * 100; |
Sven Eckelmann | e071d93 | 2015-06-22 09:13:23 +0200 | [diff] [blame] | 183 | tmp_gw_factor >>= 18; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 184 | |
| 185 | if ((tmp_gw_factor > max_gw_factor) || |
| 186 | ((tmp_gw_factor == max_gw_factor) && |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 187 | (tq_avg > max_tq))) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 188 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 189 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 190 | curr_gw = gw_node; |
| 191 | atomic_inc(&curr_gw->refcount); |
| 192 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 193 | break; |
| 194 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 195 | default: /* 2: stable connection (use best statistic) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 196 | * 3: fast-switch (use best statistic but change as |
| 197 | * soon as a better gateway appears) |
| 198 | * XX: late-switch (use best statistic but change as |
| 199 | * soon as a better gateway appears which has |
| 200 | * $routing_class more tq points) |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 201 | */ |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 202 | if (tq_avg > max_tq) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 203 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 204 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 205 | curr_gw = gw_node; |
| 206 | atomic_inc(&curr_gw->refcount); |
| 207 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 208 | break; |
| 209 | } |
| 210 | |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 211 | if (tq_avg > max_tq) |
| 212 | max_tq = tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 213 | |
| 214 | if (tmp_gw_factor > max_gw_factor) |
| 215 | max_gw_factor = tmp_gw_factor; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 216 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 217 | batadv_gw_node_free_ref(gw_node); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 218 | |
| 219 | next: |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 220 | batadv_neigh_node_free_ref(router); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 221 | if (router_ifinfo) |
| 222 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 223 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 224 | rcu_read_unlock(); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 225 | |
| 226 | return curr_gw; |
| 227 | } |
| 228 | |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 229 | /** |
| 230 | * batadv_gw_check_client_stop - check if client mode has been switched off |
| 231 | * @bat_priv: the bat priv with all the soft interface information |
| 232 | * |
| 233 | * This function assumes the caller has checked that the gw state *is actually |
| 234 | * changing*. This function is not supposed to be called when there is no state |
| 235 | * change. |
| 236 | */ |
| 237 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) |
| 238 | { |
| 239 | struct batadv_gw_node *curr_gw; |
| 240 | |
| 241 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
| 242 | return; |
| 243 | |
| 244 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 245 | if (!curr_gw) |
| 246 | return; |
| 247 | |
Antonio Quartulli | f316318 | 2013-11-04 20:59:40 +0100 | [diff] [blame] | 248 | /* deselect the current gateway so that next time that client mode is |
| 249 | * enabled a proper GW_ADD event can be sent |
| 250 | */ |
| 251 | batadv_gw_select(bat_priv, NULL); |
| 252 | |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 253 | /* if batman-adv is switching the gw client mode off and a gateway was |
| 254 | * already selected, send a DEL uevent |
| 255 | */ |
| 256 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); |
| 257 | |
| 258 | batadv_gw_node_free_ref(curr_gw); |
| 259 | } |
| 260 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 261 | void batadv_gw_election(struct batadv_priv *bat_priv) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 262 | { |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 263 | struct batadv_gw_node *curr_gw = NULL; |
| 264 | struct batadv_gw_node *next_gw = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 265 | struct batadv_neigh_node *router = NULL; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 266 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 267 | char gw_addr[18] = { '\0' }; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 268 | |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 269 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 270 | goto out; |
| 271 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 272 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 273 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 274 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
Marek Lindner | caa0bf6 | 2012-08-04 04:13:26 +0000 | [diff] [blame] | 275 | goto out; |
| 276 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 277 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 278 | |
| 279 | if (curr_gw == next_gw) |
| 280 | goto out; |
| 281 | |
| 282 | if (next_gw) { |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 283 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
| 284 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 285 | router = batadv_orig_router_get(next_gw->orig_node, |
| 286 | BATADV_IF_DEFAULT); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 287 | if (!router) { |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 288 | batadv_gw_reselect(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 289 | goto out; |
| 290 | } |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 291 | |
| 292 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
| 293 | BATADV_IF_DEFAULT); |
| 294 | if (!router_ifinfo) { |
| 295 | batadv_gw_reselect(bat_priv); |
| 296 | goto out; |
| 297 | } |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | if ((curr_gw) && (!next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 301 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 302 | "Removing selected gateway - no gateway in range\n"); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 303 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
| 304 | NULL); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 305 | } else if ((!curr_gw) && (next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 306 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 307 | "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] | 308 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 309 | next_gw->bandwidth_down / 10, |
| 310 | next_gw->bandwidth_down % 10, |
| 311 | next_gw->bandwidth_up / 10, |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 312 | next_gw->bandwidth_up % 10, |
| 313 | router_ifinfo->bat_iv.tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 314 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
| 315 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 316 | } else { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 317 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 318 | "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] | 319 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 320 | next_gw->bandwidth_down / 10, |
| 321 | next_gw->bandwidth_down % 10, |
| 322 | next_gw->bandwidth_up / 10, |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 323 | next_gw->bandwidth_up % 10, |
| 324 | router_ifinfo->bat_iv.tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 325 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
| 326 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 327 | } |
| 328 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 329 | batadv_gw_select(bat_priv, next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 330 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 331 | out: |
| 332 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 333 | batadv_gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 334 | if (next_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 335 | batadv_gw_node_free_ref(next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 336 | if (router) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 337 | batadv_neigh_node_free_ref(router); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 338 | if (router_ifinfo) |
| 339 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 340 | } |
| 341 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 342 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
| 343 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 344 | { |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 345 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
| 346 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 347 | struct batadv_orig_node *curr_gw_orig; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 348 | struct batadv_neigh_node *router_gw = NULL; |
| 349 | struct batadv_neigh_node *router_orig = NULL; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 350 | u8 gw_tq_avg, orig_tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 351 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 352 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 353 | if (!curr_gw_orig) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 354 | goto reselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 355 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 356 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 357 | if (!router_gw) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 358 | goto reselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 359 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 360 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
| 361 | BATADV_IF_DEFAULT); |
| 362 | if (!router_gw_tq) |
| 363 | goto reselect; |
| 364 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 365 | /* this node already is the gateway */ |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 366 | if (curr_gw_orig == orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 367 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 368 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 369 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 370 | if (!router_orig) |
| 371 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 372 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 373 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
| 374 | BATADV_IF_DEFAULT); |
| 375 | if (!router_orig_tq) |
| 376 | goto out; |
| 377 | |
| 378 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; |
| 379 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 380 | |
| 381 | /* the TQ value has to be better */ |
| 382 | if (orig_tq_avg < gw_tq_avg) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 383 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 384 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 385 | /* 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] | 386 | * greater the TQ value of the new gateway must be |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 387 | */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 388 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
| 389 | (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] | 390 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 391 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 392 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 393 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
| 394 | gw_tq_avg, orig_tq_avg); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 395 | |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 396 | reselect: |
| 397 | batadv_gw_reselect(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 398 | out: |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 399 | if (curr_gw_orig) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 400 | batadv_orig_node_free_ref(curr_gw_orig); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 401 | if (router_gw) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 402 | batadv_neigh_node_free_ref(router_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 403 | if (router_orig) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 404 | batadv_neigh_node_free_ref(router_orig); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 405 | if (router_gw_tq) |
| 406 | batadv_neigh_ifinfo_free_ref(router_gw_tq); |
| 407 | if (router_orig_tq) |
| 408 | batadv_neigh_ifinfo_free_ref(router_orig_tq); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 409 | } |
| 410 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 411 | /** |
| 412 | * batadv_gw_node_add - add gateway node to list of available gateways |
| 413 | * @bat_priv: the bat priv with all the soft interface information |
| 414 | * @orig_node: originator announcing gateway capabilities |
| 415 | * @gateway: announced bandwidth information |
| 416 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 417 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
| 418 | struct batadv_orig_node *orig_node, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 419 | struct batadv_tvlv_gateway_data *gateway) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 420 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 421 | struct batadv_gw_node *gw_node; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 422 | |
| 423 | if (gateway->bandwidth_down == 0) |
| 424 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 425 | |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 426 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 427 | return; |
| 428 | |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 429 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
| 430 | if (!gw_node) { |
| 431 | batadv_orig_node_free_ref(orig_node); |
| 432 | return; |
| 433 | } |
| 434 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 435 | INIT_HLIST_NODE(&gw_node->list); |
| 436 | gw_node->orig_node = orig_node; |
Simon Wunderlich | 27a4d5e | 2015-06-24 14:50:19 +0200 | [diff] [blame] | 437 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
| 438 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 439 | atomic_set(&gw_node->refcount, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 440 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 441 | spin_lock_bh(&bat_priv->gw.list_lock); |
| 442 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); |
| 443 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 444 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 445 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 446 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
| 447 | orig_node->orig, |
| 448 | ntohl(gateway->bandwidth_down) / 10, |
| 449 | ntohl(gateway->bandwidth_down) % 10, |
| 450 | ntohl(gateway->bandwidth_up) / 10, |
| 451 | ntohl(gateway->bandwidth_up) % 10); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 452 | } |
| 453 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 454 | /** |
| 455 | * batadv_gw_node_get - retrieve gateway node from list of available gateways |
| 456 | * @bat_priv: the bat priv with all the soft interface information |
| 457 | * @orig_node: originator announcing gateway capabilities |
| 458 | * |
| 459 | * Returns gateway node if found or NULL otherwise. |
| 460 | */ |
| 461 | static struct batadv_gw_node * |
| 462 | batadv_gw_node_get(struct batadv_priv *bat_priv, |
| 463 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 464 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 465 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 466 | |
| 467 | rcu_read_lock(); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 468 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
| 469 | if (gw_node_tmp->orig_node != orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 470 | continue; |
| 471 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 472 | if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) |
| 473 | continue; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 474 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 475 | gw_node = gw_node_tmp; |
| 476 | break; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 477 | } |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 478 | rcu_read_unlock(); |
Antonio Quartulli | 71e4aa9 | 2011-04-25 22:44:32 +0200 | [diff] [blame] | 479 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 480 | return gw_node; |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * batadv_gw_node_update - update list of available gateways with changed |
| 485 | * bandwidth information |
| 486 | * @bat_priv: the bat priv with all the soft interface information |
| 487 | * @orig_node: originator announcing gateway capabilities |
| 488 | * @gateway: announced bandwidth information |
| 489 | */ |
| 490 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
| 491 | struct batadv_orig_node *orig_node, |
| 492 | struct batadv_tvlv_gateway_data *gateway) |
| 493 | { |
| 494 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
| 495 | |
| 496 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
| 497 | if (!gw_node) { |
| 498 | batadv_gw_node_add(bat_priv, orig_node, gateway); |
| 499 | goto out; |
| 500 | } |
| 501 | |
| 502 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
| 503 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) |
| 504 | goto out; |
| 505 | |
| 506 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 507 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", |
| 508 | orig_node->orig, |
| 509 | gw_node->bandwidth_down / 10, |
| 510 | gw_node->bandwidth_down % 10, |
| 511 | gw_node->bandwidth_up / 10, |
| 512 | gw_node->bandwidth_up % 10, |
| 513 | ntohl(gateway->bandwidth_down) / 10, |
| 514 | ntohl(gateway->bandwidth_down) % 10, |
| 515 | ntohl(gateway->bandwidth_up) / 10, |
| 516 | ntohl(gateway->bandwidth_up) % 10); |
| 517 | |
| 518 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
| 519 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
| 520 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 521 | if (ntohl(gateway->bandwidth_down) == 0) { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 522 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 523 | "Gateway %pM removed from gateway list\n", |
| 524 | orig_node->orig); |
| 525 | |
| 526 | /* Note: We don't need a NULL check here, since curr_gw never |
| 527 | * gets dereferenced. |
| 528 | */ |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 529 | spin_lock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c18bdd0 | 2016-01-31 13:27:59 +0100 | [diff] [blame] | 530 | if (!hlist_unhashed(&gw_node->list)) { |
| 531 | hlist_del_init_rcu(&gw_node->list); |
| 532 | batadv_gw_node_free_ref(gw_node); |
| 533 | } |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 534 | spin_unlock_bh(&bat_priv->gw.list_lock); |
| 535 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 536 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 537 | if (gw_node == curr_gw) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 538 | batadv_gw_reselect(bat_priv); |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 539 | |
| 540 | if (curr_gw) |
| 541 | batadv_gw_node_free_ref(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 542 | } |
| 543 | |
| 544 | out: |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 545 | if (gw_node) |
| 546 | batadv_gw_node_free_ref(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 547 | } |
| 548 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 549 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
| 550 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 551 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 552 | struct batadv_tvlv_gateway_data gateway; |
| 553 | |
| 554 | gateway.bandwidth_down = 0; |
| 555 | gateway.bandwidth_up = 0; |
| 556 | |
| 557 | batadv_gw_node_update(bat_priv, orig_node, &gateway); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 558 | } |
| 559 | |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 560 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 561 | { |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 562 | struct batadv_gw_node *gw_node; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 563 | struct hlist_node *node_tmp; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 564 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 565 | spin_lock_bh(&bat_priv->gw.list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 566 | hlist_for_each_entry_safe(gw_node, node_tmp, |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 567 | &bat_priv->gw.list, list) { |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 568 | hlist_del_init_rcu(&gw_node->list); |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 569 | batadv_gw_node_free_ref(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 570 | } |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 571 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 572 | } |
| 573 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 574 | /* fails if orig_node has no router */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 575 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
| 576 | struct seq_file *seq, |
| 577 | const struct batadv_gw_node *gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 578 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 579 | struct batadv_gw_node *curr_gw; |
| 580 | struct batadv_neigh_node *router; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 581 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 582 | int ret = -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 583 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 584 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 585 | if (!router) |
| 586 | goto out; |
| 587 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 588 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
| 589 | if (!router_ifinfo) |
| 590 | goto out; |
| 591 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 592 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 593 | |
Joe Perches | 6d91147 | 2015-02-16 17:31:39 -0800 | [diff] [blame] | 594 | seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
| 595 | (curr_gw == gw_node ? "=>" : " "), |
| 596 | gw_node->orig_node->orig, |
| 597 | router_ifinfo->bat_iv.tq_avg, router->addr, |
| 598 | router->if_incoming->net_dev->name, |
| 599 | gw_node->bandwidth_down / 10, |
| 600 | gw_node->bandwidth_down % 10, |
| 601 | gw_node->bandwidth_up / 10, |
| 602 | gw_node->bandwidth_up % 10); |
Joe Perches | 92b8391 | 2015-02-22 13:47:56 -0800 | [diff] [blame] | 603 | ret = seq_has_overflowed(seq) ? -1 : 0; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 604 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 605 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 606 | batadv_gw_node_free_ref(curr_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 607 | out: |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 608 | if (router_ifinfo) |
| 609 | batadv_neigh_ifinfo_free_ref(router_ifinfo); |
| 610 | if (router) |
| 611 | batadv_neigh_node_free_ref(router); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 612 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 613 | } |
| 614 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 615 | 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] | 616 | { |
| 617 | struct net_device *net_dev = (struct net_device *)seq->private; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 618 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 619 | struct batadv_hard_iface *primary_if; |
| 620 | struct batadv_gw_node *gw_node; |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 621 | int gw_count = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 622 | |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 623 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 624 | if (!primary_if) |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 625 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 626 | |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 627 | seq_printf(seq, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 628 | " %-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] | 629 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
| 630 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 631 | primary_if->net_dev->dev_addr, net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 632 | |
| 633 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 634 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 635 | /* fails if orig_node has no router */ |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 636 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 637 | continue; |
| 638 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 639 | gw_count++; |
| 640 | } |
| 641 | rcu_read_unlock(); |
| 642 | |
| 643 | if (gw_count == 0) |
Antonio Quartulli | 0c81465 | 2013-03-21 09:23:29 +0100 | [diff] [blame] | 644 | seq_puts(seq, "No gateways in range ...\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 645 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 646 | out: |
| 647 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 648 | batadv_hardif_free_ref(primary_if); |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 649 | return 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 650 | } |
| 651 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 652 | /** |
| 653 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message |
| 654 | * @skb: the packet to check |
| 655 | * @header_len: a pointer to the batman-adv header size |
| 656 | * @chaddr: buffer where the client address will be stored. Valid |
| 657 | * only if the function returns BATADV_DHCP_TO_CLIENT |
| 658 | * |
| 659 | * Returns: |
| 660 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
| 661 | * while parsing it |
| 662 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server |
| 663 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client |
| 664 | * |
| 665 | * This function may re-allocate the data buffer of the skb passed as argument. |
| 666 | */ |
| 667 | enum batadv_dhcp_recipient |
| 668 | batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 669 | u8 *chaddr) |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 670 | { |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 671 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 672 | struct ethhdr *ethhdr; |
| 673 | struct iphdr *iphdr; |
| 674 | struct ipv6hdr *ipv6hdr; |
| 675 | struct udphdr *udphdr; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 676 | struct vlan_ethhdr *vhdr; |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 677 | int chaddr_offset; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 678 | __be16 proto; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 679 | u8 *p; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 680 | |
| 681 | /* check for ethernet header */ |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 682 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 683 | return BATADV_DHCP_NO; |
| 684 | |
Linus Lüssing | 927c2ed | 2014-01-19 22:22:45 +0100 | [diff] [blame] | 685 | ethhdr = eth_hdr(skb); |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 686 | proto = ethhdr->h_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 687 | *header_len += ETH_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 688 | |
| 689 | /* check for initial vlan header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 690 | if (proto == htons(ETH_P_8021Q)) { |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 691 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 692 | return BATADV_DHCP_NO; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 693 | |
Linus Lüssing | 927c2ed | 2014-01-19 22:22:45 +0100 | [diff] [blame] | 694 | vhdr = vlan_eth_hdr(skb); |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 695 | proto = vhdr->h_vlan_encapsulated_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 696 | *header_len += VLAN_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 697 | } |
| 698 | |
| 699 | /* check for ip header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 700 | switch (proto) { |
| 701 | case htons(ETH_P_IP): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 702 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 703 | return BATADV_DHCP_NO; |
| 704 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 705 | iphdr = (struct iphdr *)(skb->data + *header_len); |
| 706 | *header_len += iphdr->ihl * 4; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 707 | |
| 708 | /* check for udp header */ |
| 709 | if (iphdr->protocol != IPPROTO_UDP) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 710 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 711 | |
| 712 | break; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 713 | case htons(ETH_P_IPV6): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 714 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 715 | return BATADV_DHCP_NO; |
| 716 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 717 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
| 718 | *header_len += sizeof(*ipv6hdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 719 | |
| 720 | /* check for udp header */ |
| 721 | if (ipv6hdr->nexthdr != IPPROTO_UDP) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 722 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 723 | |
| 724 | break; |
| 725 | default: |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 726 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 727 | } |
| 728 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 729 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 730 | return BATADV_DHCP_NO; |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 731 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 732 | udphdr = (struct udphdr *)(skb->data + *header_len); |
| 733 | *header_len += sizeof(*udphdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 734 | |
| 735 | /* check for bootp port */ |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 736 | switch (proto) { |
| 737 | case htons(ETH_P_IP): |
| 738 | if (udphdr->dest == htons(67)) |
| 739 | ret = BATADV_DHCP_TO_SERVER; |
| 740 | else if (udphdr->source == htons(67)) |
| 741 | ret = BATADV_DHCP_TO_CLIENT; |
| 742 | break; |
| 743 | case htons(ETH_P_IPV6): |
| 744 | if (udphdr->dest == htons(547)) |
| 745 | ret = BATADV_DHCP_TO_SERVER; |
| 746 | else if (udphdr->source == htons(547)) |
| 747 | ret = BATADV_DHCP_TO_CLIENT; |
| 748 | break; |
| 749 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 750 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 751 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
| 752 | /* store the client address if the message is going to a client */ |
| 753 | if (ret == BATADV_DHCP_TO_CLIENT && |
| 754 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { |
| 755 | /* check if the DHCP packet carries an Ethernet DHCP */ |
| 756 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; |
| 757 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) |
| 758 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 759 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 760 | /* check if the DHCP packet carries a valid Ethernet address */ |
| 761 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; |
| 762 | if (*p != ETH_ALEN) |
| 763 | return BATADV_DHCP_NO; |
| 764 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 765 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | return ret; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 769 | } |
Antonio Quartulli | aa143d2 | 2014-09-01 14:37:27 +0200 | [diff] [blame] | 770 | |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 771 | /** |
| 772 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw |
| 773 | * @bat_priv: the bat priv with all the soft interface information |
| 774 | * @skb: the outgoing packet |
| 775 | * |
| 776 | * Check if the skb is a DHCP request and if it is sent to the current best GW |
| 777 | * server. Due to topology changes it may be the case that the GW server |
| 778 | * previously selected is not the best one anymore. |
| 779 | * |
| 780 | * Returns true if the packet destination is unicast and it is not the best gw, |
| 781 | * false otherwise. |
| 782 | * |
| 783 | * This call might reallocate skb data. |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 784 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 785 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 786 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 787 | struct sk_buff *skb) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 788 | { |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 789 | struct batadv_neigh_node *neigh_curr = NULL; |
| 790 | struct batadv_neigh_node *neigh_old = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 791 | struct batadv_orig_node *orig_dst_node = NULL; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 792 | struct batadv_gw_node *gw_node = NULL; |
| 793 | struct batadv_gw_node *curr_gw = NULL; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 794 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 795 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
| 796 | bool out_of_range = false; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 797 | u8 curr_tq_avg; |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 798 | unsigned short vid; |
| 799 | |
| 800 | vid = batadv_get_vid(skb, 0); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 801 | |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 802 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 803 | ethhdr->h_dest, vid); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 804 | if (!orig_dst_node) |
| 805 | goto out; |
| 806 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 807 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
Antonio Quartulli | 0d16449 | 2014-12-20 13:48:57 +0100 | [diff] [blame] | 808 | if (!gw_node) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 809 | goto out; |
| 810 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 811 | switch (atomic_read(&bat_priv->gw_mode)) { |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 812 | case BATADV_GW_MODE_SERVER: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 813 | /* 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] | 814 | * set the tq towards ourself as the maximum value |
| 815 | */ |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 816 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 817 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 818 | case BATADV_GW_MODE_CLIENT: |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 819 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 820 | if (!curr_gw) |
| 821 | goto out; |
| 822 | |
| 823 | /* packet is going to our gateway */ |
| 824 | if (curr_gw->orig_node == orig_dst_node) |
| 825 | goto out; |
| 826 | |
| 827 | /* If the dhcp packet has been sent to a different gw, |
| 828 | * we have to evaluate whether the old gw is still |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 829 | * reliable enough |
| 830 | */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 831 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
| 832 | NULL); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 833 | if (!neigh_curr) |
| 834 | goto out; |
| 835 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 836 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
| 837 | BATADV_IF_DEFAULT); |
| 838 | if (!curr_ifinfo) |
| 839 | goto out; |
| 840 | |
| 841 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; |
| 842 | batadv_neigh_ifinfo_free_ref(curr_ifinfo); |
| 843 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 844 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 845 | case BATADV_GW_MODE_OFF: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 846 | default: |
| 847 | goto out; |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 848 | } |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 849 | |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 850 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
Dan Carpenter | 2ef04f4 | 2011-11-29 09:09:09 +0300 | [diff] [blame] | 851 | if (!neigh_old) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 852 | goto out; |
| 853 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 854 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
| 855 | if (!old_ifinfo) |
| 856 | goto out; |
| 857 | |
| 858 | if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 859 | out_of_range = true; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 860 | batadv_neigh_ifinfo_free_ref(old_ifinfo); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 861 | |
| 862 | out: |
| 863 | if (orig_dst_node) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 864 | batadv_orig_node_free_ref(orig_dst_node); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 865 | if (curr_gw) |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 866 | batadv_gw_node_free_ref(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 867 | if (gw_node) |
| 868 | batadv_gw_node_free_ref(gw_node); |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 869 | if (neigh_old) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 870 | batadv_neigh_node_free_ref(neigh_old); |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 871 | if (neigh_curr) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 872 | batadv_neigh_node_free_ref(neigh_curr); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 873 | return out_of_range; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 874 | } |