Sven Eckelmann | 0046b04 | 2016-01-01 00:01:03 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2009-2016 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> |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 31 | #include <linux/kref.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 32 | #include <linux/list.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/rculist.h> |
| 35 | #include <linux/rcupdate.h> |
| 36 | #include <linux/seq_file.h> |
| 37 | #include <linux/skbuff.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/spinlock.h> |
| 40 | #include <linux/stddef.h> |
| 41 | #include <linux/udp.h> |
| 42 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 43 | #include "gateway_common.h" |
| 44 | #include "hard-interface.h" |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 45 | #include "originator.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 46 | #include "packet.h" |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 47 | #include "routing.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 48 | #include "sysfs.h" |
| 49 | #include "translation-table.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 50 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 51 | /* These are the offsets of the "hw type" and "hw address length" in the dhcp |
| 52 | * packet starting at the beginning of the dhcp header |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 53 | */ |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 54 | #define BATADV_DHCP_HTYPE_OFFSET 1 |
| 55 | #define BATADV_DHCP_HLEN_OFFSET 2 |
| 56 | /* Value of htype representing Ethernet */ |
| 57 | #define BATADV_DHCP_HTYPE_ETHERNET 0x01 |
| 58 | /* This is the offset of the "chaddr" field in the dhcp packet starting at the |
| 59 | * beginning of the dhcp header |
| 60 | */ |
| 61 | #define BATADV_DHCP_CHADDR_OFFSET 28 |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 62 | |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 63 | /** |
| 64 | * batadv_gw_node_release - release gw_node from lists and queue for free after |
| 65 | * rcu grace period |
| 66 | * @ref: kref pointer of the gw_node |
| 67 | */ |
| 68 | static void batadv_gw_node_release(struct kref *ref) |
| 69 | { |
| 70 | struct batadv_gw_node *gw_node; |
| 71 | |
| 72 | gw_node = container_of(ref, struct batadv_gw_node, refcount); |
| 73 | |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 74 | batadv_orig_node_put(gw_node->orig_node); |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 75 | kfree_rcu(gw_node, rcu); |
| 76 | } |
| 77 | |
| 78 | /** |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 79 | * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 80 | * @gw_node: gateway node to free |
| 81 | */ |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 82 | static void batadv_gw_node_put(struct batadv_gw_node *gw_node) |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 83 | { |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 84 | kref_put(&gw_node->refcount, batadv_gw_node_release); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 85 | } |
| 86 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 87 | static struct batadv_gw_node * |
| 88 | batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 89 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 90 | struct batadv_gw_node *gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 91 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 92 | rcu_read_lock(); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 93 | gw_node = rcu_dereference(bat_priv->gw.curr_gw); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 94 | if (!gw_node) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 95 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 96 | |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 97 | if (!kref_get_unless_zero(&gw_node->refcount)) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 98 | gw_node = NULL; |
| 99 | |
| 100 | out: |
| 101 | rcu_read_unlock(); |
| 102 | return gw_node; |
| 103 | } |
| 104 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 105 | struct batadv_orig_node * |
| 106 | batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 107 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 108 | struct batadv_gw_node *gw_node; |
| 109 | struct batadv_orig_node *orig_node = NULL; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 110 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 111 | gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 112 | if (!gw_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 113 | goto out; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 114 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 115 | rcu_read_lock(); |
| 116 | orig_node = gw_node->orig_node; |
| 117 | if (!orig_node) |
| 118 | goto unlock; |
| 119 | |
Sven Eckelmann | 7c12439 | 2016-01-16 10:29:56 +0100 | [diff] [blame] | 120 | if (!kref_get_unless_zero(&orig_node->refcount)) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 121 | orig_node = NULL; |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 122 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 123 | unlock: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 124 | rcu_read_unlock(); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 125 | out: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 126 | if (gw_node) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 127 | batadv_gw_node_put(gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 128 | return orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 129 | } |
| 130 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 131 | static void batadv_gw_select(struct batadv_priv *bat_priv, |
| 132 | struct batadv_gw_node *new_gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 133 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 134 | struct batadv_gw_node *curr_gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 135 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 136 | spin_lock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 137 | |
Sven Eckelmann | a08d497 | 2016-03-05 16:09:22 +0100 | [diff] [blame] | 138 | if (new_gw_node) |
| 139 | kref_get(&new_gw_node->refcount); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 140 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 141 | curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); |
| 142 | rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 143 | |
| 144 | if (curr_gw_node) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 145 | batadv_gw_node_put(curr_gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 146 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 147 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 148 | } |
| 149 | |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 150 | /** |
| 151 | * batadv_gw_reselect - force a gateway reselection |
| 152 | * @bat_priv: the bat priv with all the soft interface information |
| 153 | * |
| 154 | * Set a flag to remind the GW component to perform a new gateway reselection. |
| 155 | * However this function does not ensure that the current gateway is going to be |
| 156 | * deselected. The reselection mechanism may elect the same gateway once again. |
| 157 | * |
| 158 | * This means that invoking batadv_gw_reselect() does not guarantee a gateway |
| 159 | * change and therefore a uevent is not necessarily expected. |
| 160 | */ |
| 161 | void batadv_gw_reselect(struct batadv_priv *bat_priv) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 162 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 163 | atomic_set(&bat_priv->gw.reselect, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 164 | } |
| 165 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 166 | static struct batadv_gw_node * |
| 167 | batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 168 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 169 | struct batadv_neigh_node *router; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 170 | struct batadv_neigh_ifinfo *router_ifinfo; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 171 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 172 | u64 max_gw_factor = 0; |
| 173 | u64 tmp_gw_factor = 0; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 174 | u8 max_tq = 0; |
| 175 | u8 tq_avg; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 176 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 177 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 178 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 179 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Sven Eckelmann | 84d5e5e | 2012-05-12 02:09:30 +0200 | [diff] [blame] | 180 | orig_node = gw_node->orig_node; |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 181 | router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 182 | if (!router) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 183 | continue; |
| 184 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 185 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
| 186 | BATADV_IF_DEFAULT); |
| 187 | if (!router_ifinfo) |
| 188 | goto next; |
| 189 | |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 190 | if (!kref_get_unless_zero(&gw_node->refcount)) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 191 | goto next; |
| 192 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 193 | tq_avg = router_ifinfo->bat_iv.tq_avg; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 194 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 195 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
| 196 | case 1: /* fast connection */ |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 197 | tmp_gw_factor = tq_avg * tq_avg; |
| 198 | tmp_gw_factor *= gw_node->bandwidth_down; |
| 199 | tmp_gw_factor *= 100 * 100; |
Sven Eckelmann | e071d93 | 2015-06-22 09:13:23 +0200 | [diff] [blame] | 200 | tmp_gw_factor >>= 18; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 201 | |
| 202 | if ((tmp_gw_factor > max_gw_factor) || |
| 203 | ((tmp_gw_factor == max_gw_factor) && |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 204 | (tq_avg > max_tq))) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 205 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 206 | batadv_gw_node_put(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 207 | curr_gw = gw_node; |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 208 | kref_get(&curr_gw->refcount); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 209 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 210 | break; |
| 211 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 212 | default: /* 2: stable connection (use best statistic) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 213 | * 3: fast-switch (use best statistic but change as |
| 214 | * soon as a better gateway appears) |
| 215 | * XX: late-switch (use best statistic but change as |
| 216 | * soon as a better gateway appears which has |
| 217 | * $routing_class more tq points) |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 218 | */ |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 219 | if (tq_avg > max_tq) { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 220 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 221 | batadv_gw_node_put(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 222 | curr_gw = gw_node; |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 223 | kref_get(&curr_gw->refcount); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 224 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 225 | break; |
| 226 | } |
| 227 | |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 228 | if (tq_avg > max_tq) |
| 229 | max_tq = tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 230 | |
| 231 | if (tmp_gw_factor > max_gw_factor) |
| 232 | max_gw_factor = tmp_gw_factor; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 233 | |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 234 | batadv_gw_node_put(gw_node); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 235 | |
| 236 | next: |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 237 | batadv_neigh_node_put(router); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 238 | if (router_ifinfo) |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 239 | batadv_neigh_ifinfo_put(router_ifinfo); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 240 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 241 | rcu_read_unlock(); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 242 | |
| 243 | return curr_gw; |
| 244 | } |
| 245 | |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 246 | /** |
| 247 | * batadv_gw_check_client_stop - check if client mode has been switched off |
| 248 | * @bat_priv: the bat priv with all the soft interface information |
| 249 | * |
| 250 | * This function assumes the caller has checked that the gw state *is actually |
| 251 | * changing*. This function is not supposed to be called when there is no state |
| 252 | * change. |
| 253 | */ |
| 254 | void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) |
| 255 | { |
| 256 | struct batadv_gw_node *curr_gw; |
| 257 | |
| 258 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
| 259 | return; |
| 260 | |
| 261 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 262 | if (!curr_gw) |
| 263 | return; |
| 264 | |
Antonio Quartulli | f316318 | 2013-11-04 20:59:40 +0100 | [diff] [blame] | 265 | /* deselect the current gateway so that next time that client mode is |
| 266 | * enabled a proper GW_ADD event can be sent |
| 267 | */ |
| 268 | batadv_gw_select(bat_priv, NULL); |
| 269 | |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 270 | /* if batman-adv is switching the gw client mode off and a gateway was |
| 271 | * already selected, send a DEL uevent |
| 272 | */ |
| 273 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); |
| 274 | |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 275 | batadv_gw_node_put(curr_gw); |
Antonio Quartulli | c6eaa3f | 2013-07-13 00:06:00 +0200 | [diff] [blame] | 276 | } |
| 277 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 278 | void batadv_gw_election(struct batadv_priv *bat_priv) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 279 | { |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 280 | struct batadv_gw_node *curr_gw = NULL; |
| 281 | struct batadv_gw_node *next_gw = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 282 | struct batadv_neigh_node *router = NULL; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 283 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 284 | char gw_addr[18] = { '\0' }; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 285 | |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 286 | if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 287 | goto out; |
| 288 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 289 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 290 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 291 | if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw) |
Marek Lindner | caa0bf6 | 2012-08-04 04:13:26 +0000 | [diff] [blame] | 292 | goto out; |
| 293 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 294 | next_gw = batadv_gw_get_best_gw_node(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 295 | |
| 296 | if (curr_gw == next_gw) |
| 297 | goto out; |
| 298 | |
| 299 | if (next_gw) { |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 300 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
| 301 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 302 | router = batadv_orig_router_get(next_gw->orig_node, |
| 303 | BATADV_IF_DEFAULT); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 304 | if (!router) { |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 305 | batadv_gw_reselect(bat_priv); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 306 | goto out; |
| 307 | } |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 308 | |
| 309 | router_ifinfo = batadv_neigh_ifinfo_get(router, |
| 310 | BATADV_IF_DEFAULT); |
| 311 | if (!router_ifinfo) { |
| 312 | batadv_gw_reselect(bat_priv); |
| 313 | goto out; |
| 314 | } |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | if ((curr_gw) && (!next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 318 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 319 | "Removing selected gateway - no gateway in range\n"); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 320 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
| 321 | NULL); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 322 | } else if ((!curr_gw) && (next_gw)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 323 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 324 | "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] | 325 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 326 | next_gw->bandwidth_down / 10, |
| 327 | next_gw->bandwidth_down % 10, |
| 328 | next_gw->bandwidth_up / 10, |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 329 | next_gw->bandwidth_up % 10, |
| 330 | router_ifinfo->bat_iv.tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 331 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
| 332 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 333 | } else { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 334 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 335 | "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] | 336 | next_gw->orig_node->orig, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 337 | next_gw->bandwidth_down / 10, |
| 338 | next_gw->bandwidth_down % 10, |
| 339 | next_gw->bandwidth_up / 10, |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 340 | next_gw->bandwidth_up % 10, |
| 341 | router_ifinfo->bat_iv.tq_avg); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 342 | batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
| 343 | gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 344 | } |
| 345 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 346 | batadv_gw_select(bat_priv, next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 347 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 348 | out: |
| 349 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 350 | batadv_gw_node_put(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 351 | if (next_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 352 | batadv_gw_node_put(next_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 353 | if (router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 354 | batadv_neigh_node_put(router); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 355 | if (router_ifinfo) |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 356 | batadv_neigh_ifinfo_put(router_ifinfo); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 357 | } |
| 358 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 359 | void batadv_gw_check_election(struct batadv_priv *bat_priv, |
| 360 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 361 | { |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 362 | struct batadv_neigh_ifinfo *router_orig_tq = NULL; |
| 363 | struct batadv_neigh_ifinfo *router_gw_tq = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 364 | struct batadv_orig_node *curr_gw_orig; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 365 | struct batadv_neigh_node *router_gw = NULL; |
| 366 | struct batadv_neigh_node *router_orig = NULL; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 367 | u8 gw_tq_avg, orig_tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 368 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 369 | curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 370 | if (!curr_gw_orig) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 371 | goto reselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 372 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 373 | router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 374 | if (!router_gw) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 375 | goto reselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 376 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 377 | router_gw_tq = batadv_neigh_ifinfo_get(router_gw, |
| 378 | BATADV_IF_DEFAULT); |
| 379 | if (!router_gw_tq) |
| 380 | goto reselect; |
| 381 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 382 | /* this node already is the gateway */ |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 383 | if (curr_gw_orig == orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 384 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 385 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 386 | router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 387 | if (!router_orig) |
| 388 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 389 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 390 | router_orig_tq = batadv_neigh_ifinfo_get(router_orig, |
| 391 | BATADV_IF_DEFAULT); |
| 392 | if (!router_orig_tq) |
| 393 | goto out; |
| 394 | |
| 395 | gw_tq_avg = router_gw_tq->bat_iv.tq_avg; |
| 396 | orig_tq_avg = router_orig_tq->bat_iv.tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 397 | |
| 398 | /* the TQ value has to be better */ |
| 399 | if (orig_tq_avg < gw_tq_avg) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 400 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 401 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 402 | /* 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] | 403 | * greater the TQ value of the new gateway must be |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 404 | */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 405 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
| 406 | (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] | 407 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 408 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 409 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 410 | "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
| 411 | gw_tq_avg, orig_tq_avg); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 412 | |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 413 | reselect: |
| 414 | batadv_gw_reselect(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 415 | out: |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 416 | if (curr_gw_orig) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 417 | batadv_orig_node_put(curr_gw_orig); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 418 | if (router_gw) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 419 | batadv_neigh_node_put(router_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 420 | if (router_orig) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 421 | batadv_neigh_node_put(router_orig); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 422 | if (router_gw_tq) |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 423 | batadv_neigh_ifinfo_put(router_gw_tq); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 424 | if (router_orig_tq) |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 425 | batadv_neigh_ifinfo_put(router_orig_tq); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 426 | } |
| 427 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 428 | /** |
| 429 | * batadv_gw_node_add - add gateway node to list of available gateways |
| 430 | * @bat_priv: the bat priv with all the soft interface information |
| 431 | * @orig_node: originator announcing gateway capabilities |
| 432 | * @gateway: announced bandwidth information |
| 433 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 434 | static void batadv_gw_node_add(struct batadv_priv *bat_priv, |
| 435 | struct batadv_orig_node *orig_node, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 436 | struct batadv_tvlv_gateway_data *gateway) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 437 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 438 | struct batadv_gw_node *gw_node; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 439 | |
| 440 | if (gateway->bandwidth_down == 0) |
| 441 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 442 | |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 443 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
Sven Eckelmann | c3ba37a7 | 2016-03-05 16:09:23 +0100 | [diff] [blame] | 444 | if (!gw_node) |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 445 | return; |
Antonio Quartulli | 377fe0f | 2014-05-02 01:35:13 +0200 | [diff] [blame] | 446 | |
Sven Eckelmann | c3ba37a7 | 2016-03-05 16:09:23 +0100 | [diff] [blame] | 447 | kref_get(&orig_node->refcount); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 448 | INIT_HLIST_NODE(&gw_node->list); |
| 449 | gw_node->orig_node = orig_node; |
Simon Wunderlich | 27a4d5e | 2015-06-24 14:50:19 +0200 | [diff] [blame] | 450 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
| 451 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 452 | kref_init(&gw_node->refcount); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 453 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 454 | spin_lock_bh(&bat_priv->gw.list_lock); |
| 455 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); |
| 456 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 457 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 458 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 459 | "Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n", |
| 460 | orig_node->orig, |
| 461 | ntohl(gateway->bandwidth_down) / 10, |
| 462 | ntohl(gateway->bandwidth_down) % 10, |
| 463 | ntohl(gateway->bandwidth_up) / 10, |
| 464 | ntohl(gateway->bandwidth_up) % 10); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 465 | } |
| 466 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 467 | /** |
| 468 | * batadv_gw_node_get - retrieve gateway node from list of available gateways |
| 469 | * @bat_priv: the bat priv with all the soft interface information |
| 470 | * @orig_node: originator announcing gateway capabilities |
| 471 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 472 | * Return: gateway node if found or NULL otherwise. |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 473 | */ |
| 474 | static struct batadv_gw_node * |
| 475 | batadv_gw_node_get(struct batadv_priv *bat_priv, |
| 476 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 477 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 478 | struct batadv_gw_node *gw_node_tmp, *gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 479 | |
| 480 | rcu_read_lock(); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 481 | hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.list, list) { |
| 482 | if (gw_node_tmp->orig_node != orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 483 | continue; |
| 484 | |
Sven Eckelmann | e7aed32 | 2016-01-16 10:29:41 +0100 | [diff] [blame] | 485 | if (!kref_get_unless_zero(&gw_node_tmp->refcount)) |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 486 | continue; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 487 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 488 | gw_node = gw_node_tmp; |
| 489 | break; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 490 | } |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 491 | rcu_read_unlock(); |
Antonio Quartulli | 71e4aa9 | 2011-04-25 22:44:32 +0200 | [diff] [blame] | 492 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 493 | return gw_node; |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * batadv_gw_node_update - update list of available gateways with changed |
| 498 | * bandwidth information |
| 499 | * @bat_priv: the bat priv with all the soft interface information |
| 500 | * @orig_node: originator announcing gateway capabilities |
| 501 | * @gateway: announced bandwidth information |
| 502 | */ |
| 503 | void batadv_gw_node_update(struct batadv_priv *bat_priv, |
| 504 | struct batadv_orig_node *orig_node, |
| 505 | struct batadv_tvlv_gateway_data *gateway) |
| 506 | { |
| 507 | struct batadv_gw_node *gw_node, *curr_gw = NULL; |
| 508 | |
| 509 | gw_node = batadv_gw_node_get(bat_priv, orig_node); |
| 510 | if (!gw_node) { |
| 511 | batadv_gw_node_add(bat_priv, orig_node, gateway); |
| 512 | goto out; |
| 513 | } |
| 514 | |
| 515 | if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) && |
| 516 | (gw_node->bandwidth_up == ntohl(gateway->bandwidth_up))) |
| 517 | goto out; |
| 518 | |
| 519 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 520 | "Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n", |
| 521 | orig_node->orig, |
| 522 | gw_node->bandwidth_down / 10, |
| 523 | gw_node->bandwidth_down % 10, |
| 524 | gw_node->bandwidth_up / 10, |
| 525 | gw_node->bandwidth_up % 10, |
| 526 | ntohl(gateway->bandwidth_down) / 10, |
| 527 | ntohl(gateway->bandwidth_down) % 10, |
| 528 | ntohl(gateway->bandwidth_up) / 10, |
| 529 | ntohl(gateway->bandwidth_up) % 10); |
| 530 | |
| 531 | gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); |
| 532 | gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); |
| 533 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 534 | if (ntohl(gateway->bandwidth_down) == 0) { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 535 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| 536 | "Gateway %pM removed from gateway list\n", |
| 537 | orig_node->orig); |
| 538 | |
| 539 | /* Note: We don't need a NULL check here, since curr_gw never |
| 540 | * gets dereferenced. |
| 541 | */ |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 542 | spin_lock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c18bdd0 | 2016-01-31 13:27:59 +0100 | [diff] [blame] | 543 | if (!hlist_unhashed(&gw_node->list)) { |
| 544 | hlist_del_init_rcu(&gw_node->list); |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 545 | batadv_gw_node_put(gw_node); |
Sven Eckelmann | c18bdd0 | 2016-01-31 13:27:59 +0100 | [diff] [blame] | 546 | } |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 547 | spin_unlock_bh(&bat_priv->gw.list_lock); |
| 548 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 549 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| 550 | if (gw_node == curr_gw) |
Antonio Quartulli | 4e820e7 | 2013-11-04 20:59:41 +0100 | [diff] [blame] | 551 | batadv_gw_reselect(bat_priv); |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 552 | |
| 553 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 554 | batadv_gw_node_put(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | out: |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 558 | if (gw_node) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 559 | batadv_gw_node_put(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 560 | } |
| 561 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 562 | void batadv_gw_node_delete(struct batadv_priv *bat_priv, |
| 563 | struct batadv_orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 564 | { |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 565 | struct batadv_tvlv_gateway_data gateway; |
| 566 | |
| 567 | gateway.bandwidth_down = 0; |
| 568 | gateway.bandwidth_up = 0; |
| 569 | |
| 570 | batadv_gw_node_update(bat_priv, orig_node, &gateway); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 571 | } |
| 572 | |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 573 | void batadv_gw_node_free(struct batadv_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 574 | { |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 575 | struct batadv_gw_node *gw_node; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 576 | struct hlist_node *node_tmp; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 577 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 578 | spin_lock_bh(&bat_priv->gw.list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 579 | hlist_for_each_entry_safe(gw_node, node_tmp, |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 580 | &bat_priv->gw.list, list) { |
Simon Wunderlich | bd3524c | 2015-08-03 19:13:58 +0200 | [diff] [blame] | 581 | hlist_del_init_rcu(&gw_node->list); |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 582 | batadv_gw_node_put(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 583 | } |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 584 | spin_unlock_bh(&bat_priv->gw.list_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 585 | } |
| 586 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 587 | /* fails if orig_node has no router */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 588 | static int batadv_write_buffer_text(struct batadv_priv *bat_priv, |
| 589 | struct seq_file *seq, |
| 590 | const struct batadv_gw_node *gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 591 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 592 | struct batadv_gw_node *curr_gw; |
| 593 | struct batadv_neigh_node *router; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 594 | struct batadv_neigh_ifinfo *router_ifinfo = NULL; |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 595 | int ret = -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 596 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 597 | router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 598 | if (!router) |
| 599 | goto out; |
| 600 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 601 | router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT); |
| 602 | if (!router_ifinfo) |
| 603 | goto out; |
| 604 | |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 605 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 606 | |
Joe Perches | 6d91147 | 2015-02-16 17:31:39 -0800 | [diff] [blame] | 607 | seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %u.%u/%u.%u MBit\n", |
| 608 | (curr_gw == gw_node ? "=>" : " "), |
| 609 | gw_node->orig_node->orig, |
| 610 | router_ifinfo->bat_iv.tq_avg, router->addr, |
| 611 | router->if_incoming->net_dev->name, |
| 612 | gw_node->bandwidth_down / 10, |
| 613 | gw_node->bandwidth_down % 10, |
| 614 | gw_node->bandwidth_up / 10, |
| 615 | gw_node->bandwidth_up % 10); |
Joe Perches | 92b8391 | 2015-02-22 13:47:56 -0800 | [diff] [blame] | 616 | ret = seq_has_overflowed(seq) ? -1 : 0; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 617 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 618 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 619 | batadv_gw_node_put(curr_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 620 | out: |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 621 | if (router_ifinfo) |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 622 | batadv_neigh_ifinfo_put(router_ifinfo); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 623 | if (router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 624 | batadv_neigh_node_put(router); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 625 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 626 | } |
| 627 | |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 628 | 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] | 629 | { |
| 630 | struct net_device *net_dev = (struct net_device *)seq->private; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 631 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 632 | struct batadv_hard_iface *primary_if; |
| 633 | struct batadv_gw_node *gw_node; |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 634 | int gw_count = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 635 | |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 636 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 637 | if (!primary_if) |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 638 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 639 | |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 640 | seq_printf(seq, |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 641 | " %-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] | 642 | "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
| 643 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 644 | primary_if->net_dev->dev_addr, net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 645 | |
| 646 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 647 | hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 648 | /* fails if orig_node has no router */ |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 649 | if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 650 | continue; |
| 651 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 652 | gw_count++; |
| 653 | } |
| 654 | rcu_read_unlock(); |
| 655 | |
| 656 | if (gw_count == 0) |
Antonio Quartulli | 0c81465 | 2013-03-21 09:23:29 +0100 | [diff] [blame] | 657 | seq_puts(seq, "No gateways in range ...\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 658 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 659 | out: |
| 660 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 661 | batadv_hardif_put(primary_if); |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 662 | return 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 663 | } |
| 664 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 665 | /** |
| 666 | * batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message |
| 667 | * @skb: the packet to check |
| 668 | * @header_len: a pointer to the batman-adv header size |
| 669 | * @chaddr: buffer where the client address will be stored. Valid |
| 670 | * only if the function returns BATADV_DHCP_TO_CLIENT |
| 671 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 672 | * This function may re-allocate the data buffer of the skb passed as argument. |
| 673 | * |
| 674 | * Return: |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 675 | * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error |
| 676 | * while parsing it |
| 677 | * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server |
| 678 | * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 679 | */ |
| 680 | enum batadv_dhcp_recipient |
| 681 | 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] | 682 | u8 *chaddr) |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 683 | { |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 684 | enum batadv_dhcp_recipient ret = BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 685 | struct ethhdr *ethhdr; |
| 686 | struct iphdr *iphdr; |
| 687 | struct ipv6hdr *ipv6hdr; |
| 688 | struct udphdr *udphdr; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 689 | struct vlan_ethhdr *vhdr; |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 690 | int chaddr_offset; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 691 | __be16 proto; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 692 | u8 *p; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 693 | |
| 694 | /* check for ethernet header */ |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 695 | if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 696 | return BATADV_DHCP_NO; |
| 697 | |
Linus Lüssing | 927c2ed | 2014-01-19 22:22:45 +0100 | [diff] [blame] | 698 | ethhdr = eth_hdr(skb); |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 699 | proto = ethhdr->h_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 700 | *header_len += ETH_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 701 | |
| 702 | /* check for initial vlan header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 703 | if (proto == htons(ETH_P_8021Q)) { |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 704 | if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 705 | return BATADV_DHCP_NO; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 706 | |
Linus Lüssing | 927c2ed | 2014-01-19 22:22:45 +0100 | [diff] [blame] | 707 | vhdr = vlan_eth_hdr(skb); |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 708 | proto = vhdr->h_vlan_encapsulated_proto; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 709 | *header_len += VLAN_HLEN; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | /* check for ip header */ |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 713 | switch (proto) { |
| 714 | case htons(ETH_P_IP): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 715 | if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 716 | return BATADV_DHCP_NO; |
| 717 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 718 | iphdr = (struct iphdr *)(skb->data + *header_len); |
| 719 | *header_len += iphdr->ihl * 4; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 720 | |
| 721 | /* check for udp header */ |
| 722 | if (iphdr->protocol != IPPROTO_UDP) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 723 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 724 | |
| 725 | break; |
Antonio Quartulli | f7f8ed5 | 2013-05-12 21:51:15 +0200 | [diff] [blame] | 726 | case htons(ETH_P_IPV6): |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 727 | if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 728 | return BATADV_DHCP_NO; |
| 729 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 730 | ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
| 731 | *header_len += sizeof(*ipv6hdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 732 | |
| 733 | /* check for udp header */ |
| 734 | if (ipv6hdr->nexthdr != IPPROTO_UDP) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 735 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 736 | |
| 737 | break; |
| 738 | default: |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 739 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 740 | } |
| 741 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 742 | if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 743 | return BATADV_DHCP_NO; |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 744 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 745 | udphdr = (struct udphdr *)(skb->data + *header_len); |
| 746 | *header_len += sizeof(*udphdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 747 | |
| 748 | /* check for bootp port */ |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 749 | switch (proto) { |
| 750 | case htons(ETH_P_IP): |
| 751 | if (udphdr->dest == htons(67)) |
| 752 | ret = BATADV_DHCP_TO_SERVER; |
| 753 | else if (udphdr->source == htons(67)) |
| 754 | ret = BATADV_DHCP_TO_CLIENT; |
| 755 | break; |
| 756 | case htons(ETH_P_IPV6): |
| 757 | if (udphdr->dest == htons(547)) |
| 758 | ret = BATADV_DHCP_TO_SERVER; |
| 759 | else if (udphdr->source == htons(547)) |
| 760 | ret = BATADV_DHCP_TO_CLIENT; |
| 761 | break; |
| 762 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 763 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 764 | chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET; |
| 765 | /* store the client address if the message is going to a client */ |
| 766 | if (ret == BATADV_DHCP_TO_CLIENT && |
| 767 | pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) { |
| 768 | /* check if the DHCP packet carries an Ethernet DHCP */ |
| 769 | p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET; |
| 770 | if (*p != BATADV_DHCP_HTYPE_ETHERNET) |
| 771 | return BATADV_DHCP_NO; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 772 | |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 773 | /* check if the DHCP packet carries a valid Ethernet address */ |
| 774 | p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET; |
| 775 | if (*p != ETH_ALEN) |
| 776 | return BATADV_DHCP_NO; |
| 777 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 778 | ether_addr_copy(chaddr, skb->data + chaddr_offset); |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | return ret; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 782 | } |
Antonio Quartulli | aa143d2 | 2014-09-01 14:37:27 +0200 | [diff] [blame] | 783 | |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 784 | /** |
| 785 | * batadv_gw_out_of_range - check if the dhcp request destination is the best gw |
| 786 | * @bat_priv: the bat priv with all the soft interface information |
| 787 | * @skb: the outgoing packet |
| 788 | * |
| 789 | * Check if the skb is a DHCP request and if it is sent to the current best GW |
| 790 | * server. Due to topology changes it may be the case that the GW server |
| 791 | * previously selected is not the best one anymore. |
| 792 | * |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 793 | * This call might reallocate skb data. |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 794 | * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 795 | * |
| 796 | * Return: true if the packet destination is unicast and it is not the best gw, |
| 797 | * false otherwise. |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 798 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 799 | bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 800 | struct sk_buff *skb) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 801 | { |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 802 | struct batadv_neigh_node *neigh_curr = NULL; |
| 803 | struct batadv_neigh_node *neigh_old = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 804 | struct batadv_orig_node *orig_dst_node = NULL; |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 805 | struct batadv_gw_node *gw_node = NULL; |
| 806 | struct batadv_gw_node *curr_gw = NULL; |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 807 | struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo; |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 808 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
| 809 | bool out_of_range = false; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 810 | u8 curr_tq_avg; |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 811 | unsigned short vid; |
| 812 | |
| 813 | vid = batadv_get_vid(skb, 0); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 814 | |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 815 | orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
Antonio Quartulli | bbb877e | 2013-06-04 12:11:42 +0200 | [diff] [blame] | 816 | ethhdr->h_dest, vid); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 817 | if (!orig_dst_node) |
| 818 | goto out; |
| 819 | |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 820 | gw_node = batadv_gw_node_get(bat_priv, orig_dst_node); |
Antonio Quartulli | 0d16449 | 2014-12-20 13:48:57 +0100 | [diff] [blame] | 821 | if (!gw_node) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 822 | goto out; |
| 823 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 824 | switch (atomic_read(&bat_priv->gw_mode)) { |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 825 | case BATADV_GW_MODE_SERVER: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 826 | /* 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] | 827 | * set the tq towards ourself as the maximum value |
| 828 | */ |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 829 | curr_tq_avg = BATADV_TQ_MAX_VALUE; |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 830 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 831 | case BATADV_GW_MODE_CLIENT: |
Sven Eckelmann | 1409a83 | 2012-05-12 18:33:55 +0200 | [diff] [blame] | 832 | curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 833 | if (!curr_gw) |
| 834 | goto out; |
| 835 | |
| 836 | /* packet is going to our gateway */ |
| 837 | if (curr_gw->orig_node == orig_dst_node) |
| 838 | goto out; |
| 839 | |
| 840 | /* If the dhcp packet has been sent to a different gw, |
| 841 | * we have to evaluate whether the old gw is still |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 842 | * reliable enough |
| 843 | */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 844 | neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
| 845 | NULL); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 846 | if (!neigh_curr) |
| 847 | goto out; |
| 848 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 849 | curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr, |
| 850 | BATADV_IF_DEFAULT); |
| 851 | if (!curr_ifinfo) |
| 852 | goto out; |
| 853 | |
| 854 | curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 855 | batadv_neigh_ifinfo_put(curr_ifinfo); |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 856 | |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 857 | break; |
Sven Eckelmann | cd646ab | 2012-06-03 22:19:18 +0200 | [diff] [blame] | 858 | case BATADV_GW_MODE_OFF: |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 859 | default: |
| 860 | goto out; |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 861 | } |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 862 | |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 863 | neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
Dan Carpenter | 2ef04f4 | 2011-11-29 09:09:09 +0300 | [diff] [blame] | 864 | if (!neigh_old) |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 865 | goto out; |
| 866 | |
Simon Wunderlich | 8965233 | 2013-11-13 19:14:46 +0100 | [diff] [blame] | 867 | old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT); |
| 868 | if (!old_ifinfo) |
| 869 | goto out; |
| 870 | |
| 871 | 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] | 872 | out_of_range = true; |
Sven Eckelmann | 044fa3a | 2016-01-17 11:01:12 +0100 | [diff] [blame] | 873 | batadv_neigh_ifinfo_put(old_ifinfo); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 874 | |
| 875 | out: |
| 876 | if (orig_dst_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 877 | batadv_orig_node_put(orig_dst_node); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 878 | if (curr_gw) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 879 | batadv_gw_node_put(curr_gw); |
Marek Lindner | 414254e | 2013-04-23 21:39:58 +0800 | [diff] [blame] | 880 | if (gw_node) |
Sven Eckelmann | 3a01743 | 2016-01-17 11:01:18 +0100 | [diff] [blame] | 881 | batadv_gw_node_put(gw_node); |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 882 | if (neigh_old) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 883 | batadv_neigh_node_put(neigh_old); |
Antonio Quartulli | 43676ab | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 884 | if (neigh_curr) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 885 | batadv_neigh_node_put(neigh_curr); |
Marek Lindner | be7af5c | 2011-09-08 13:12:53 +0200 | [diff] [blame] | 886 | return out_of_range; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 887 | } |