Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1 | /* |
Sven Eckelmann | 64afe35 | 2011-01-27 10:38:15 +0100 | [diff] [blame] | 2 | * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 3 | * |
| 4 | * Marek Lindner |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of version 2 of the GNU General Public |
| 8 | * License as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301, USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "main.h" |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 23 | #include "bat_sysfs.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 24 | #include "gateway_client.h" |
| 25 | #include "gateway_common.h" |
| 26 | #include "hard-interface.h" |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 27 | #include "originator.h" |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 28 | #include "routing.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 29 | #include <linux/ip.h> |
| 30 | #include <linux/ipv6.h> |
| 31 | #include <linux/udp.h> |
| 32 | #include <linux/if_vlan.h> |
| 33 | |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 34 | /* This is the offset of the options field in a dhcp packet starting at |
| 35 | * the beginning of the dhcp header */ |
| 36 | #define DHCP_OPTIONS_OFFSET 240 |
| 37 | #define DHCP_REQUEST 3 |
| 38 | |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 39 | static void gw_node_free_ref(struct gw_node *gw_node) |
| 40 | { |
| 41 | if (atomic_dec_and_test(&gw_node->refcount)) |
Paul E. McKenney | eb340b2 | 2011-05-01 23:25:02 -0700 | [diff] [blame] | 42 | kfree_rcu(gw_node, rcu); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 43 | } |
| 44 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 45 | static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 46 | { |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 47 | struct gw_node *gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 48 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 49 | rcu_read_lock(); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 50 | gw_node = rcu_dereference(bat_priv->curr_gw); |
| 51 | if (!gw_node) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 52 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 53 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 54 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 55 | gw_node = NULL; |
| 56 | |
| 57 | out: |
| 58 | rcu_read_unlock(); |
| 59 | return gw_node; |
| 60 | } |
| 61 | |
| 62 | struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv) |
| 63 | { |
| 64 | struct gw_node *gw_node; |
| 65 | struct orig_node *orig_node = NULL; |
| 66 | |
| 67 | gw_node = gw_get_selected_gw_node(bat_priv); |
| 68 | if (!gw_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 69 | goto out; |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 70 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 71 | rcu_read_lock(); |
| 72 | orig_node = gw_node->orig_node; |
| 73 | if (!orig_node) |
| 74 | goto unlock; |
| 75 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 76 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
| 77 | orig_node = NULL; |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 78 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 79 | unlock: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 80 | rcu_read_unlock(); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 81 | out: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 82 | if (gw_node) |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 83 | gw_node_free_ref(gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 84 | return orig_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 85 | } |
| 86 | |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 87 | static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 88 | { |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 89 | struct gw_node *curr_gw_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 90 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 91 | spin_lock_bh(&bat_priv->gw_list_lock); |
| 92 | |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 93 | if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
| 94 | new_gw_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 95 | |
Sven Eckelmann | 728cbc6 | 2011-05-15 00:50:21 +0200 | [diff] [blame] | 96 | curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 97 | rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 98 | |
| 99 | if (curr_gw_node) |
| 100 | gw_node_free_ref(curr_gw_node); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 101 | |
| 102 | spin_unlock_bh(&bat_priv->gw_list_lock); |
| 103 | } |
| 104 | |
| 105 | void gw_deselect(struct bat_priv *bat_priv) |
| 106 | { |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 107 | atomic_set(&bat_priv->gw_reselect, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 108 | } |
| 109 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 110 | static struct gw_node *gw_get_best_gw_node(struct bat_priv *bat_priv) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 111 | { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 112 | struct neigh_node *router; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 113 | struct hlist_node *node; |
| 114 | struct gw_node *gw_node, *curr_gw = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 115 | uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 116 | uint8_t max_tq = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 117 | int down, up; |
| 118 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 119 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 120 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 121 | if (gw_node->deleted) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 122 | continue; |
| 123 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 124 | router = orig_node_get_router(gw_node->orig_node); |
| 125 | if (!router) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 126 | continue; |
| 127 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 128 | if (!atomic_inc_not_zero(&gw_node->refcount)) |
| 129 | goto next; |
| 130 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 131 | switch (atomic_read(&bat_priv->gw_sel_class)) { |
| 132 | case 1: /* fast connection */ |
| 133 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, |
| 134 | &down, &up); |
| 135 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 136 | tmp_gw_factor = (router->tq_avg * router->tq_avg * |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 137 | down * 100 * 100) / |
| 138 | (TQ_LOCAL_WINDOW_SIZE * |
| 139 | TQ_LOCAL_WINDOW_SIZE * 64); |
| 140 | |
| 141 | if ((tmp_gw_factor > max_gw_factor) || |
| 142 | ((tmp_gw_factor == max_gw_factor) && |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 143 | (router->tq_avg > max_tq))) { |
| 144 | if (curr_gw) |
| 145 | gw_node_free_ref(curr_gw); |
| 146 | curr_gw = gw_node; |
| 147 | atomic_inc(&curr_gw->refcount); |
| 148 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 149 | break; |
| 150 | |
| 151 | default: /** |
| 152 | * 2: stable connection (use best statistic) |
| 153 | * 3: fast-switch (use best statistic but change as |
| 154 | * soon as a better gateway appears) |
| 155 | * XX: late-switch (use best statistic but change as |
| 156 | * soon as a better gateway appears which has |
| 157 | * $routing_class more tq points) |
| 158 | **/ |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 159 | if (router->tq_avg > max_tq) { |
| 160 | if (curr_gw) |
| 161 | gw_node_free_ref(curr_gw); |
| 162 | curr_gw = gw_node; |
| 163 | atomic_inc(&curr_gw->refcount); |
| 164 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 165 | break; |
| 166 | } |
| 167 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 168 | if (router->tq_avg > max_tq) |
| 169 | max_tq = router->tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 170 | |
| 171 | if (tmp_gw_factor > max_gw_factor) |
| 172 | max_gw_factor = tmp_gw_factor; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 173 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 174 | gw_node_free_ref(gw_node); |
| 175 | |
| 176 | next: |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 177 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 178 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 179 | rcu_read_unlock(); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 180 | |
| 181 | return curr_gw; |
| 182 | } |
| 183 | |
| 184 | void gw_election(struct bat_priv *bat_priv) |
| 185 | { |
| 186 | struct gw_node *curr_gw = NULL, *next_gw = NULL; |
| 187 | struct neigh_node *router = NULL; |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 188 | char gw_addr[18] = { '\0' }; |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 189 | |
| 190 | /** |
| 191 | * The batman daemon checks here if we already passed a full originator |
| 192 | * cycle in order to make sure we don't choose the first gateway we |
| 193 | * hear about. This check is based on the daemon's uptime which we |
| 194 | * don't have. |
| 195 | **/ |
| 196 | if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT) |
| 197 | goto out; |
| 198 | |
| 199 | if (!atomic_dec_not_zero(&bat_priv->gw_reselect)) |
| 200 | goto out; |
| 201 | |
| 202 | curr_gw = gw_get_selected_gw_node(bat_priv); |
| 203 | |
| 204 | next_gw = gw_get_best_gw_node(bat_priv); |
| 205 | |
| 206 | if (curr_gw == next_gw) |
| 207 | goto out; |
| 208 | |
| 209 | if (next_gw) { |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 210 | sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
| 211 | |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 212 | router = orig_node_get_router(next_gw->orig_node); |
| 213 | if (!router) { |
| 214 | gw_deselect(bat_priv); |
| 215 | goto out; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | if ((curr_gw) && (!next_gw)) { |
| 220 | bat_dbg(DBG_BATMAN, bat_priv, |
| 221 | "Removing selected gateway - no gateway in range\n"); |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 222 | throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 223 | } else if ((!curr_gw) && (next_gw)) { |
| 224 | bat_dbg(DBG_BATMAN, bat_priv, |
| 225 | "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", |
| 226 | next_gw->orig_node->orig, |
| 227 | next_gw->orig_node->gw_flags, |
| 228 | router->tq_avg); |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 229 | throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 230 | } else { |
| 231 | bat_dbg(DBG_BATMAN, bat_priv, |
| 232 | "Changing route to gateway %pM " |
| 233 | "(gw_flags: %i, tq: %i)\n", |
| 234 | next_gw->orig_node->orig, |
| 235 | next_gw->orig_node->gw_flags, |
| 236 | router->tq_avg); |
Antonio Quartulli | 19595e0 | 2011-06-12 11:58:58 +0200 | [diff] [blame] | 237 | throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | gw_select(bat_priv, next_gw); |
| 241 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 242 | out: |
| 243 | if (curr_gw) |
| 244 | gw_node_free_ref(curr_gw); |
Antonio Quartulli | 2265c14 | 2011-04-27 00:22:00 +0200 | [diff] [blame] | 245 | if (next_gw) |
| 246 | gw_node_free_ref(next_gw); |
| 247 | if (router) |
| 248 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node) |
| 252 | { |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 253 | struct orig_node *curr_gw_orig; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 254 | struct neigh_node *router_gw = NULL, *router_orig = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 255 | uint8_t gw_tq_avg, orig_tq_avg; |
| 256 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 257 | curr_gw_orig = gw_get_selected_orig(bat_priv); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 258 | if (!curr_gw_orig) |
| 259 | goto deselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 260 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 261 | router_gw = orig_node_get_router(curr_gw_orig); |
| 262 | if (!router_gw) |
| 263 | goto deselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 264 | |
| 265 | /* this node already is the gateway */ |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 266 | if (curr_gw_orig == orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 267 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 268 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 269 | router_orig = orig_node_get_router(orig_node); |
| 270 | if (!router_orig) |
| 271 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 272 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 273 | gw_tq_avg = router_gw->tq_avg; |
| 274 | orig_tq_avg = router_orig->tq_avg; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 275 | |
| 276 | /* the TQ value has to be better */ |
| 277 | if (orig_tq_avg < gw_tq_avg) |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 278 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 279 | |
| 280 | /** |
| 281 | * if the routing class is greater than 3 the value tells us how much |
| 282 | * greater the TQ value of the new gateway must be |
| 283 | **/ |
| 284 | if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
| 285 | (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] | 286 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 287 | |
| 288 | bat_dbg(DBG_BATMAN, bat_priv, |
| 289 | "Restarting gateway selection: better gateway found (tq curr: " |
| 290 | "%i, tq new: %i)\n", |
| 291 | gw_tq_avg, orig_tq_avg); |
| 292 | |
| 293 | deselect: |
| 294 | gw_deselect(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 295 | out: |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 296 | if (curr_gw_orig) |
| 297 | orig_node_free_ref(curr_gw_orig); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 298 | if (router_gw) |
| 299 | neigh_node_free_ref(router_gw); |
| 300 | if (router_orig) |
| 301 | neigh_node_free_ref(router_orig); |
Linus Lüssing | 57f0c07 | 2011-03-14 22:43:33 +0000 | [diff] [blame] | 302 | |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 303 | return; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | static void gw_node_add(struct bat_priv *bat_priv, |
| 307 | struct orig_node *orig_node, uint8_t new_gwflags) |
| 308 | { |
| 309 | struct gw_node *gw_node; |
| 310 | int down, up; |
| 311 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 312 | gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 313 | if (!gw_node) |
| 314 | return; |
| 315 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 316 | INIT_HLIST_NODE(&gw_node->list); |
| 317 | gw_node->orig_node = orig_node; |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 318 | atomic_set(&gw_node->refcount, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 319 | |
| 320 | spin_lock_bh(&bat_priv->gw_list_lock); |
| 321 | hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); |
| 322 | spin_unlock_bh(&bat_priv->gw_list_lock); |
| 323 | |
| 324 | gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
| 325 | bat_dbg(DBG_BATMAN, bat_priv, |
| 326 | "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", |
| 327 | orig_node->orig, new_gwflags, |
| 328 | (down > 2048 ? down / 1024 : down), |
| 329 | (down > 2048 ? "MBit" : "KBit"), |
| 330 | (up > 2048 ? up / 1024 : up), |
| 331 | (up > 2048 ? "MBit" : "KBit")); |
| 332 | } |
| 333 | |
| 334 | void gw_node_update(struct bat_priv *bat_priv, |
| 335 | struct orig_node *orig_node, uint8_t new_gwflags) |
| 336 | { |
| 337 | struct hlist_node *node; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 338 | struct gw_node *gw_node, *curr_gw; |
| 339 | |
Antonio Quartulli | 71e4aa9 | 2011-04-25 22:44:32 +0200 | [diff] [blame] | 340 | /** |
| 341 | * Note: We don't need a NULL check here, since curr_gw never gets |
| 342 | * dereferenced. If curr_gw is NULL we also should not exit as we may |
| 343 | * have this gateway in our list (duplication check!) even though we |
| 344 | * have no currently selected gateway. |
| 345 | */ |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 346 | curr_gw = gw_get_selected_gw_node(bat_priv); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 347 | |
| 348 | rcu_read_lock(); |
| 349 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
| 350 | if (gw_node->orig_node != orig_node) |
| 351 | continue; |
| 352 | |
| 353 | bat_dbg(DBG_BATMAN, bat_priv, |
| 354 | "Gateway class of originator %pM changed from " |
| 355 | "%i to %i\n", |
| 356 | orig_node->orig, gw_node->orig_node->gw_flags, |
| 357 | new_gwflags); |
| 358 | |
| 359 | gw_node->deleted = 0; |
| 360 | |
Marek Lindner | ecbd532 | 2011-06-09 17:13:09 +0200 | [diff] [blame] | 361 | if (new_gwflags == NO_FLAGS) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 362 | gw_node->deleted = jiffies; |
| 363 | bat_dbg(DBG_BATMAN, bat_priv, |
| 364 | "Gateway %pM removed from gateway list\n", |
| 365 | orig_node->orig); |
| 366 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 367 | if (gw_node == curr_gw) |
| 368 | goto deselect; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 369 | } |
| 370 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 371 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 372 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 373 | |
Marek Lindner | ecbd532 | 2011-06-09 17:13:09 +0200 | [diff] [blame] | 374 | if (new_gwflags == NO_FLAGS) |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 375 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 376 | |
| 377 | gw_node_add(bat_priv, orig_node, new_gwflags); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 378 | goto unlock; |
| 379 | |
| 380 | deselect: |
| 381 | gw_deselect(bat_priv); |
| 382 | unlock: |
| 383 | rcu_read_unlock(); |
Antonio Quartulli | 71e4aa9 | 2011-04-25 22:44:32 +0200 | [diff] [blame] | 384 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 385 | if (curr_gw) |
| 386 | gw_node_free_ref(curr_gw); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node) |
| 390 | { |
Sven Eckelmann | 6b9aadf | 2011-06-04 12:40:37 +0200 | [diff] [blame] | 391 | gw_node_update(bat_priv, orig_node, 0); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | void gw_node_purge(struct bat_priv *bat_priv) |
| 395 | { |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 396 | struct gw_node *gw_node, *curr_gw; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 397 | struct hlist_node *node, *node_tmp; |
| 398 | unsigned long timeout = 2 * PURGE_TIMEOUT * HZ; |
Sven Eckelmann | b4e1705 | 2011-06-15 09:41:37 +0200 | [diff] [blame] | 399 | int do_deselect = 0; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 400 | |
| 401 | curr_gw = gw_get_selected_gw_node(bat_priv); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 402 | |
| 403 | spin_lock_bh(&bat_priv->gw_list_lock); |
| 404 | |
| 405 | hlist_for_each_entry_safe(gw_node, node, node_tmp, |
| 406 | &bat_priv->gw_list, list) { |
| 407 | if (((!gw_node->deleted) || |
| 408 | (time_before(jiffies, gw_node->deleted + timeout))) && |
| 409 | atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) |
| 410 | continue; |
| 411 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 412 | if (curr_gw == gw_node) |
| 413 | do_deselect = 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 414 | |
| 415 | hlist_del_rcu(&gw_node->list); |
Marek Lindner | 25b6d3c | 2011-02-10 14:33:49 +0000 | [diff] [blame] | 416 | gw_node_free_ref(gw_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 417 | } |
| 418 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 419 | spin_unlock_bh(&bat_priv->gw_list_lock); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 420 | |
| 421 | /* gw_deselect() needs to acquire the gw_list_lock */ |
| 422 | if (do_deselect) |
| 423 | gw_deselect(bat_priv); |
| 424 | |
| 425 | if (curr_gw) |
| 426 | gw_node_free_ref(curr_gw); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 427 | } |
| 428 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 429 | /** |
| 430 | * fails if orig_node has no router |
| 431 | */ |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 432 | static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq, |
| 433 | const struct gw_node *gw_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 434 | { |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 435 | struct gw_node *curr_gw; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 436 | struct neigh_node *router; |
| 437 | int down, up, ret = -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 438 | |
| 439 | gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
| 440 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 441 | router = orig_node_get_router(gw_node->orig_node); |
| 442 | if (!router) |
| 443 | goto out; |
| 444 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 445 | curr_gw = gw_get_selected_gw_node(bat_priv); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 446 | |
| 447 | ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 448 | (curr_gw == gw_node ? "=>" : " "), |
| 449 | gw_node->orig_node->orig, |
| 450 | router->tq_avg, router->addr, |
| 451 | router->if_incoming->net_dev->name, |
| 452 | gw_node->orig_node->gw_flags, |
| 453 | (down > 2048 ? down / 1024 : down), |
| 454 | (down > 2048 ? "MBit" : "KBit"), |
| 455 | (up > 2048 ? up / 1024 : up), |
| 456 | (up > 2048 ? "MBit" : "KBit")); |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 457 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 458 | neigh_node_free_ref(router); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 459 | if (curr_gw) |
| 460 | gw_node_free_ref(curr_gw); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 461 | out: |
Linus Lüssing | 5d02b3c | 2011-02-13 21:13:02 +0000 | [diff] [blame] | 462 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | int gw_client_seq_print_text(struct seq_file *seq, void *offset) |
| 466 | { |
| 467 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 468 | struct bat_priv *bat_priv = netdev_priv(net_dev); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 469 | struct hard_iface *primary_if; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 470 | struct gw_node *gw_node; |
| 471 | struct hlist_node *node; |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 472 | int gw_count = 0, ret = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 473 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 474 | primary_if = primary_if_get_selected(bat_priv); |
| 475 | if (!primary_if) { |
| 476 | ret = seq_printf(seq, "BATMAN mesh %s disabled - please " |
| 477 | "specify interfaces to enable it\n", |
| 478 | net_dev->name); |
| 479 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 480 | } |
| 481 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 482 | if (primary_if->if_status != IF_ACTIVE) { |
| 483 | ret = seq_printf(seq, "BATMAN mesh %s disabled - " |
| 484 | "primary interface not active\n", |
| 485 | net_dev->name); |
| 486 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... " |
Sven Eckelmann | 44c4349 | 2011-07-05 10:42:51 +0200 | [diff] [blame] | 490 | "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 491 | "Gateway", "#", TQ_MAX_VALUE, "Nexthop", |
Sven Eckelmann | 44c4349 | 2011-07-05 10:42:51 +0200 | [diff] [blame] | 492 | "outgoingIF", SOURCE_VERSION, primary_if->net_dev->name, |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 493 | primary_if->net_dev->dev_addr, net_dev->name); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 494 | |
| 495 | rcu_read_lock(); |
| 496 | hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
| 497 | if (gw_node->deleted) |
| 498 | continue; |
| 499 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 500 | /* fails if orig_node has no router */ |
| 501 | if (_write_buffer_text(bat_priv, seq, gw_node) < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 502 | continue; |
| 503 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 504 | gw_count++; |
| 505 | } |
| 506 | rcu_read_unlock(); |
| 507 | |
| 508 | if (gw_count == 0) |
| 509 | seq_printf(seq, "No gateways in range ...\n"); |
| 510 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 511 | out: |
| 512 | if (primary_if) |
| 513 | hardif_free_ref(primary_if); |
| 514 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 515 | } |
| 516 | |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 517 | static bool is_type_dhcprequest(struct sk_buff *skb, int header_len) |
| 518 | { |
| 519 | int ret = false; |
| 520 | unsigned char *p; |
| 521 | int pkt_len; |
| 522 | |
| 523 | if (skb_linearize(skb) < 0) |
| 524 | goto out; |
| 525 | |
| 526 | pkt_len = skb_headlen(skb); |
| 527 | |
| 528 | if (pkt_len < header_len + DHCP_OPTIONS_OFFSET + 1) |
| 529 | goto out; |
| 530 | |
| 531 | p = skb->data + header_len + DHCP_OPTIONS_OFFSET; |
| 532 | pkt_len -= header_len + DHCP_OPTIONS_OFFSET + 1; |
| 533 | |
| 534 | /* Access the dhcp option lists. Each entry is made up by: |
| 535 | * - octect 1: option type |
| 536 | * - octect 2: option data len (only if type != 255 and 0) |
| 537 | * - octect 3: option data */ |
| 538 | while (*p != 255 && !ret) { |
| 539 | /* p now points to the first octect: option type */ |
| 540 | if (*p == 53) { |
| 541 | /* type 53 is the message type option. |
| 542 | * Jump the len octect and go to the data octect */ |
| 543 | if (pkt_len < 2) |
| 544 | goto out; |
| 545 | p += 2; |
| 546 | |
| 547 | /* check if the message type is what we need */ |
| 548 | if (*p == DHCP_REQUEST) |
| 549 | ret = true; |
| 550 | break; |
| 551 | } else if (*p == 0) { |
| 552 | /* option type 0 (padding), just go forward */ |
| 553 | if (pkt_len < 1) |
| 554 | goto out; |
| 555 | pkt_len--; |
| 556 | p++; |
| 557 | } else { |
| 558 | /* This is any other option. So we get the length... */ |
| 559 | if (pkt_len < 1) |
| 560 | goto out; |
| 561 | pkt_len--; |
| 562 | p++; |
| 563 | |
| 564 | /* ...and then we jump over the data */ |
| 565 | if (pkt_len < *p) |
| 566 | goto out; |
| 567 | pkt_len -= *p; |
| 568 | p += (*p); |
| 569 | } |
| 570 | } |
| 571 | out: |
| 572 | return ret; |
| 573 | } |
| 574 | |
| 575 | int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb, |
| 576 | struct orig_node *old_gw) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 577 | { |
| 578 | struct ethhdr *ethhdr; |
| 579 | struct iphdr *iphdr; |
| 580 | struct ipv6hdr *ipv6hdr; |
| 581 | struct udphdr *udphdr; |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 582 | struct gw_node *curr_gw; |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 583 | struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 584 | unsigned int header_len = 0; |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 585 | int ret = 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 586 | |
| 587 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF) |
| 588 | return 0; |
| 589 | |
| 590 | /* check for ethernet header */ |
| 591 | if (!pskb_may_pull(skb, header_len + ETH_HLEN)) |
| 592 | return 0; |
| 593 | ethhdr = (struct ethhdr *)skb->data; |
| 594 | header_len += ETH_HLEN; |
| 595 | |
| 596 | /* check for initial vlan header */ |
| 597 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { |
| 598 | if (!pskb_may_pull(skb, header_len + VLAN_HLEN)) |
| 599 | return 0; |
| 600 | ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
| 601 | header_len += VLAN_HLEN; |
| 602 | } |
| 603 | |
| 604 | /* check for ip header */ |
| 605 | switch (ntohs(ethhdr->h_proto)) { |
| 606 | case ETH_P_IP: |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 607 | if (!pskb_may_pull(skb, header_len + sizeof(*iphdr))) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 608 | return 0; |
| 609 | iphdr = (struct iphdr *)(skb->data + header_len); |
| 610 | header_len += iphdr->ihl * 4; |
| 611 | |
| 612 | /* check for udp header */ |
| 613 | if (iphdr->protocol != IPPROTO_UDP) |
| 614 | return 0; |
| 615 | |
| 616 | break; |
| 617 | case ETH_P_IPV6: |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 618 | if (!pskb_may_pull(skb, header_len + sizeof(*ipv6hdr))) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 619 | return 0; |
| 620 | ipv6hdr = (struct ipv6hdr *)(skb->data + header_len); |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 621 | header_len += sizeof(*ipv6hdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 622 | |
| 623 | /* check for udp header */ |
| 624 | if (ipv6hdr->nexthdr != IPPROTO_UDP) |
| 625 | return 0; |
| 626 | |
| 627 | break; |
| 628 | default: |
| 629 | return 0; |
| 630 | } |
| 631 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 632 | if (!pskb_may_pull(skb, header_len + sizeof(*udphdr))) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 633 | return 0; |
| 634 | udphdr = (struct udphdr *)(skb->data + header_len); |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 635 | header_len += sizeof(*udphdr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 636 | |
| 637 | /* check for bootp port */ |
| 638 | if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && |
| 639 | (ntohs(udphdr->dest) != 67)) |
| 640 | return 0; |
| 641 | |
| 642 | if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && |
| 643 | (ntohs(udphdr->dest) != 547)) |
| 644 | return 0; |
| 645 | |
| 646 | if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER) |
| 647 | return -1; |
| 648 | |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 649 | curr_gw = gw_get_selected_gw_node(bat_priv); |
| 650 | if (!curr_gw) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 651 | return 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 652 | |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 653 | /* If old_gw != NULL then this packet is unicast. |
| 654 | * So, at this point we have to check the message type: if it is a |
| 655 | * DHCPREQUEST we have to decide whether to drop it or not */ |
| 656 | if (old_gw && curr_gw->orig_node != old_gw) { |
| 657 | if (is_type_dhcprequest(skb, header_len)) { |
| 658 | /* If the dhcp packet has been sent to a different gw, |
| 659 | * we have to evaluate whether the old gw is still |
| 660 | * reliable enough */ |
| 661 | neigh_curr = find_router(bat_priv, curr_gw->orig_node, |
| 662 | NULL); |
| 663 | neigh_old = find_router(bat_priv, old_gw, NULL); |
| 664 | if (!neigh_curr || !neigh_old) |
| 665 | goto free_neigh; |
| 666 | if (neigh_curr->tq_avg - neigh_old->tq_avg < |
| 667 | GW_THRESHOLD) |
| 668 | ret = -1; |
| 669 | } |
| 670 | } |
| 671 | free_neigh: |
| 672 | if (neigh_old) |
| 673 | neigh_node_free_ref(neigh_old); |
| 674 | if (neigh_curr) |
| 675 | neigh_node_free_ref(neigh_curr); |
Marek Lindner | c4aac1a | 2011-03-23 11:24:34 +0100 | [diff] [blame] | 676 | if (curr_gw) |
| 677 | gw_node_free_ref(curr_gw); |
Antonio Quartulli | 43676ab5 | 2011-04-26 21:31:45 +0200 | [diff] [blame] | 678 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 679 | } |