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) 2007-2011 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 3 | * |
| 4 | * Marek Lindner, Simon Wunderlich |
| 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" |
| 23 | #include "routing.h" |
| 24 | #include "send.h" |
| 25 | #include "hash.h" |
| 26 | #include "soft-interface.h" |
| 27 | #include "hard-interface.h" |
| 28 | #include "icmp_socket.h" |
| 29 | #include "translation-table.h" |
| 30 | #include "originator.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 31 | #include "ring_buffer.h" |
| 32 | #include "vis.h" |
| 33 | #include "aggregation.h" |
| 34 | #include "gateway_common.h" |
| 35 | #include "gateway_client.h" |
| 36 | #include "unicast.h" |
| 37 | |
| 38 | void slide_own_bcast_window(struct batman_if *batman_if) |
| 39 | { |
| 40 | struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); |
| 41 | struct hashtable_t *hash = bat_priv->orig_hash; |
| 42 | struct hlist_node *walk; |
| 43 | struct hlist_head *head; |
| 44 | struct element_t *bucket; |
| 45 | struct orig_node *orig_node; |
| 46 | unsigned long *word; |
| 47 | int i; |
| 48 | size_t word_index; |
| 49 | |
| 50 | spin_lock_bh(&bat_priv->orig_hash_lock); |
| 51 | |
| 52 | for (i = 0; i < hash->size; i++) { |
| 53 | head = &hash->table[i]; |
| 54 | |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 55 | rcu_read_lock(); |
| 56 | hlist_for_each_entry_rcu(bucket, walk, head, hlist) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 57 | orig_node = bucket->data; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 58 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 59 | word_index = batman_if->if_num * NUM_WORDS; |
| 60 | word = &(orig_node->bcast_own[word_index]); |
| 61 | |
| 62 | bit_get_packet(bat_priv, word, 1, 0); |
| 63 | orig_node->bcast_own_sum[batman_if->if_num] = |
| 64 | bit_packet_count(word); |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 65 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 66 | } |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 67 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 71 | } |
| 72 | |
| 73 | static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, |
| 74 | unsigned char *hna_buff, int hna_buff_len) |
| 75 | { |
| 76 | if ((hna_buff_len != orig_node->hna_buff_len) || |
| 77 | ((hna_buff_len > 0) && |
| 78 | (orig_node->hna_buff_len > 0) && |
| 79 | (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { |
| 80 | |
| 81 | if (orig_node->hna_buff_len > 0) |
| 82 | hna_global_del_orig(bat_priv, orig_node, |
| 83 | "originator changed hna"); |
| 84 | |
| 85 | if ((hna_buff_len > 0) && (hna_buff)) |
| 86 | hna_global_add_orig(bat_priv, orig_node, |
| 87 | hna_buff, hna_buff_len); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static void update_route(struct bat_priv *bat_priv, |
| 92 | struct orig_node *orig_node, |
| 93 | struct neigh_node *neigh_node, |
| 94 | unsigned char *hna_buff, int hna_buff_len) |
| 95 | { |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 96 | struct neigh_node *neigh_node_tmp; |
| 97 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 98 | /* route deleted */ |
| 99 | if ((orig_node->router) && (!neigh_node)) { |
| 100 | |
| 101 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
| 102 | orig_node->orig); |
| 103 | hna_global_del_orig(bat_priv, orig_node, |
| 104 | "originator timed out"); |
| 105 | |
| 106 | /* route added */ |
| 107 | } else if ((!orig_node->router) && (neigh_node)) { |
| 108 | |
| 109 | bat_dbg(DBG_ROUTES, bat_priv, |
| 110 | "Adding route towards: %pM (via %pM)\n", |
| 111 | orig_node->orig, neigh_node->addr); |
| 112 | hna_global_add_orig(bat_priv, orig_node, |
| 113 | hna_buff, hna_buff_len); |
| 114 | |
| 115 | /* route changed */ |
| 116 | } else { |
| 117 | bat_dbg(DBG_ROUTES, bat_priv, |
| 118 | "Changing route towards: %pM " |
| 119 | "(now via %pM - was via %pM)\n", |
| 120 | orig_node->orig, neigh_node->addr, |
| 121 | orig_node->router->addr); |
| 122 | } |
| 123 | |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 124 | if (neigh_node) |
| 125 | kref_get(&neigh_node->refcount); |
| 126 | neigh_node_tmp = orig_node->router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 127 | orig_node->router = neigh_node; |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 128 | if (neigh_node_tmp) |
| 129 | kref_put(&neigh_node_tmp->refcount, neigh_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | |
| 133 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, |
| 134 | struct neigh_node *neigh_node, unsigned char *hna_buff, |
| 135 | int hna_buff_len) |
| 136 | { |
| 137 | |
| 138 | if (!orig_node) |
| 139 | return; |
| 140 | |
| 141 | if (orig_node->router != neigh_node) |
| 142 | update_route(bat_priv, orig_node, neigh_node, |
| 143 | hna_buff, hna_buff_len); |
| 144 | /* may be just HNA changed */ |
| 145 | else |
| 146 | update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len); |
| 147 | } |
| 148 | |
| 149 | static int is_bidirectional_neigh(struct orig_node *orig_node, |
| 150 | struct orig_node *orig_neigh_node, |
| 151 | struct batman_packet *batman_packet, |
| 152 | struct batman_if *if_incoming) |
| 153 | { |
| 154 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 155 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 156 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 157 | unsigned char total_count; |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 158 | int ret = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 159 | |
| 160 | if (orig_node == orig_neigh_node) { |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 161 | rcu_read_lock(); |
| 162 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 163 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 164 | |
| 165 | if (compare_orig(tmp_neigh_node->addr, |
| 166 | orig_neigh_node->orig) && |
| 167 | (tmp_neigh_node->if_incoming == if_incoming)) |
| 168 | neigh_node = tmp_neigh_node; |
| 169 | } |
| 170 | |
| 171 | if (!neigh_node) |
| 172 | neigh_node = create_neighbor(orig_node, |
| 173 | orig_neigh_node, |
| 174 | orig_neigh_node->orig, |
| 175 | if_incoming); |
| 176 | /* create_neighbor failed, return 0 */ |
| 177 | if (!neigh_node) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 178 | goto unlock; |
| 179 | |
| 180 | kref_get(&neigh_node->refcount); |
| 181 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 182 | |
| 183 | neigh_node->last_valid = jiffies; |
| 184 | } else { |
| 185 | /* find packet count of corresponding one hop neighbor */ |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 186 | rcu_read_lock(); |
| 187 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 188 | &orig_neigh_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 189 | |
| 190 | if (compare_orig(tmp_neigh_node->addr, |
| 191 | orig_neigh_node->orig) && |
| 192 | (tmp_neigh_node->if_incoming == if_incoming)) |
| 193 | neigh_node = tmp_neigh_node; |
| 194 | } |
| 195 | |
| 196 | if (!neigh_node) |
| 197 | neigh_node = create_neighbor(orig_neigh_node, |
| 198 | orig_neigh_node, |
| 199 | orig_neigh_node->orig, |
| 200 | if_incoming); |
| 201 | /* create_neighbor failed, return 0 */ |
| 202 | if (!neigh_node) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 203 | goto unlock; |
| 204 | |
| 205 | kref_get(&neigh_node->refcount); |
| 206 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | orig_node->last_valid = jiffies; |
| 210 | |
| 211 | /* pay attention to not get a value bigger than 100 % */ |
| 212 | total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > |
| 213 | neigh_node->real_packet_count ? |
| 214 | neigh_node->real_packet_count : |
| 215 | orig_neigh_node->bcast_own_sum[if_incoming->if_num]); |
| 216 | |
| 217 | /* if we have too few packets (too less data) we set tq_own to zero */ |
| 218 | /* if we receive too few packets it is not considered bidirectional */ |
| 219 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || |
| 220 | (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
| 221 | orig_neigh_node->tq_own = 0; |
| 222 | else |
| 223 | /* neigh_node->real_packet_count is never zero as we |
| 224 | * only purge old information when getting new |
| 225 | * information */ |
| 226 | orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / |
| 227 | neigh_node->real_packet_count; |
| 228 | |
| 229 | /* |
| 230 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
| 231 | * affect the nearly-symmetric links only a little, but |
| 232 | * punishes asymmetric links more. This will give a value |
| 233 | * between 0 and TQ_MAX_VALUE |
| 234 | */ |
| 235 | orig_neigh_node->tq_asym_penalty = |
| 236 | TQ_MAX_VALUE - |
| 237 | (TQ_MAX_VALUE * |
| 238 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * |
| 239 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * |
| 240 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / |
| 241 | (TQ_LOCAL_WINDOW_SIZE * |
| 242 | TQ_LOCAL_WINDOW_SIZE * |
| 243 | TQ_LOCAL_WINDOW_SIZE); |
| 244 | |
| 245 | batman_packet->tq = ((batman_packet->tq * |
| 246 | orig_neigh_node->tq_own * |
| 247 | orig_neigh_node->tq_asym_penalty) / |
| 248 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); |
| 249 | |
| 250 | bat_dbg(DBG_BATMAN, bat_priv, |
| 251 | "bidirectional: " |
| 252 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " |
| 253 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " |
| 254 | "total tq: %3i\n", |
| 255 | orig_node->orig, orig_neigh_node->orig, total_count, |
| 256 | neigh_node->real_packet_count, orig_neigh_node->tq_own, |
| 257 | orig_neigh_node->tq_asym_penalty, batman_packet->tq); |
| 258 | |
| 259 | /* if link has the minimum required transmission quality |
| 260 | * consider it bidirectional */ |
| 261 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 262 | ret = 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 263 | |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 264 | goto out; |
| 265 | |
| 266 | unlock: |
| 267 | rcu_read_unlock(); |
| 268 | out: |
| 269 | if (neigh_node) |
| 270 | kref_put(&neigh_node->refcount, neigh_node_free_ref); |
| 271 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | static void update_orig(struct bat_priv *bat_priv, |
| 275 | struct orig_node *orig_node, |
| 276 | struct ethhdr *ethhdr, |
| 277 | struct batman_packet *batman_packet, |
| 278 | struct batman_if *if_incoming, |
| 279 | unsigned char *hna_buff, int hna_buff_len, |
| 280 | char is_duplicate) |
| 281 | { |
| 282 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 283 | struct orig_node *orig_node_tmp; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 284 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 285 | int tmp_hna_buff_len; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 286 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 287 | |
| 288 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " |
| 289 | "Searching and updating originator entry of received packet\n"); |
| 290 | |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 291 | rcu_read_lock(); |
| 292 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 293 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 294 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && |
| 295 | (tmp_neigh_node->if_incoming == if_incoming)) { |
| 296 | neigh_node = tmp_neigh_node; |
| 297 | continue; |
| 298 | } |
| 299 | |
| 300 | if (is_duplicate) |
| 301 | continue; |
| 302 | |
| 303 | ring_buffer_set(tmp_neigh_node->tq_recv, |
| 304 | &tmp_neigh_node->tq_index, 0); |
| 305 | tmp_neigh_node->tq_avg = |
| 306 | ring_buffer_avg(tmp_neigh_node->tq_recv); |
| 307 | } |
| 308 | |
| 309 | if (!neigh_node) { |
| 310 | struct orig_node *orig_tmp; |
| 311 | |
| 312 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); |
| 313 | if (!orig_tmp) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 314 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 315 | |
| 316 | neigh_node = create_neighbor(orig_node, orig_tmp, |
| 317 | ethhdr->h_source, if_incoming); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 318 | |
| 319 | kref_put(&orig_tmp->refcount, orig_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 320 | if (!neigh_node) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 321 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 322 | } else |
| 323 | bat_dbg(DBG_BATMAN, bat_priv, |
| 324 | "Updating existing last-hop neighbor of originator\n"); |
| 325 | |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 326 | kref_get(&neigh_node->refcount); |
| 327 | rcu_read_unlock(); |
| 328 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 329 | orig_node->flags = batman_packet->flags; |
| 330 | neigh_node->last_valid = jiffies; |
| 331 | |
| 332 | ring_buffer_set(neigh_node->tq_recv, |
| 333 | &neigh_node->tq_index, |
| 334 | batman_packet->tq); |
| 335 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); |
| 336 | |
| 337 | if (!is_duplicate) { |
| 338 | orig_node->last_ttl = batman_packet->ttl; |
| 339 | neigh_node->last_ttl = batman_packet->ttl; |
| 340 | } |
| 341 | |
| 342 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
| 343 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); |
| 344 | |
| 345 | /* if this neighbor already is our next hop there is nothing |
| 346 | * to change */ |
| 347 | if (orig_node->router == neigh_node) |
| 348 | goto update_hna; |
| 349 | |
| 350 | /* if this neighbor does not offer a better TQ we won't consider it */ |
| 351 | if ((orig_node->router) && |
| 352 | (orig_node->router->tq_avg > neigh_node->tq_avg)) |
| 353 | goto update_hna; |
| 354 | |
| 355 | /* if the TQ is the same and the link not more symetric we |
| 356 | * won't consider it either */ |
| 357 | if ((orig_node->router) && |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 358 | (neigh_node->tq_avg == orig_node->router->tq_avg)) { |
| 359 | orig_node_tmp = orig_node->router->orig_node; |
| 360 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 361 | bcast_own_sum_orig = |
| 362 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
| 363 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 364 | |
| 365 | orig_node_tmp = neigh_node->orig_node; |
| 366 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 367 | bcast_own_sum_neigh = |
| 368 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
| 369 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 370 | |
| 371 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) |
| 372 | goto update_hna; |
| 373 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 374 | |
| 375 | update_routes(bat_priv, orig_node, neigh_node, |
| 376 | hna_buff, tmp_hna_buff_len); |
| 377 | goto update_gw; |
| 378 | |
| 379 | update_hna: |
| 380 | update_routes(bat_priv, orig_node, orig_node->router, |
| 381 | hna_buff, tmp_hna_buff_len); |
| 382 | |
| 383 | update_gw: |
| 384 | if (orig_node->gw_flags != batman_packet->gw_flags) |
| 385 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); |
| 386 | |
| 387 | orig_node->gw_flags = batman_packet->gw_flags; |
| 388 | |
| 389 | /* restart gateway selection if fast or late switching was enabled */ |
| 390 | if ((orig_node->gw_flags) && |
| 391 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && |
| 392 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
| 393 | gw_check_election(bat_priv, orig_node); |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 394 | |
| 395 | goto out; |
| 396 | |
| 397 | unlock: |
| 398 | rcu_read_unlock(); |
| 399 | out: |
| 400 | if (neigh_node) |
| 401 | kref_put(&neigh_node->refcount, neigh_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | /* checks whether the host restarted and is in the protection time. |
| 405 | * returns: |
| 406 | * 0 if the packet is to be accepted |
| 407 | * 1 if the packet is to be ignored. |
| 408 | */ |
| 409 | static int window_protected(struct bat_priv *bat_priv, |
| 410 | int32_t seq_num_diff, |
| 411 | unsigned long *last_reset) |
| 412 | { |
| 413 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) |
| 414 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { |
| 415 | if (time_after(jiffies, *last_reset + |
| 416 | msecs_to_jiffies(RESET_PROTECTION_MS))) { |
| 417 | |
| 418 | *last_reset = jiffies; |
| 419 | bat_dbg(DBG_BATMAN, bat_priv, |
| 420 | "old packet received, start protection\n"); |
| 421 | |
| 422 | return 0; |
| 423 | } else |
| 424 | return 1; |
| 425 | } |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /* processes a batman packet for all interfaces, adjusts the sequence number and |
| 430 | * finds out whether it is a duplicate. |
| 431 | * returns: |
| 432 | * 1 the packet is a duplicate |
| 433 | * 0 the packet has not yet been received |
| 434 | * -1 the packet is old and has been received while the seqno window |
| 435 | * was protected. Caller should drop it. |
| 436 | */ |
| 437 | static char count_real_packets(struct ethhdr *ethhdr, |
| 438 | struct batman_packet *batman_packet, |
| 439 | struct batman_if *if_incoming) |
| 440 | { |
| 441 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 442 | struct orig_node *orig_node; |
| 443 | struct neigh_node *tmp_neigh_node; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 444 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 445 | char is_duplicate = 0; |
| 446 | int32_t seq_diff; |
| 447 | int need_update = 0; |
| 448 | int set_mark; |
| 449 | |
| 450 | orig_node = get_orig_node(bat_priv, batman_packet->orig); |
| 451 | if (!orig_node) |
| 452 | return 0; |
| 453 | |
| 454 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
| 455 | |
| 456 | /* signalize caller that the packet is to be dropped. */ |
| 457 | if (window_protected(bat_priv, seq_diff, |
| 458 | &orig_node->batman_seqno_reset)) |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 459 | goto err; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 460 | |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 461 | rcu_read_lock(); |
| 462 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 463 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 464 | |
| 465 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, |
| 466 | orig_node->last_real_seqno, |
| 467 | batman_packet->seqno); |
| 468 | |
| 469 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && |
| 470 | (tmp_neigh_node->if_incoming == if_incoming)) |
| 471 | set_mark = 1; |
| 472 | else |
| 473 | set_mark = 0; |
| 474 | |
| 475 | /* if the window moved, set the update flag. */ |
| 476 | need_update |= bit_get_packet(bat_priv, |
| 477 | tmp_neigh_node->real_bits, |
| 478 | seq_diff, set_mark); |
| 479 | |
| 480 | tmp_neigh_node->real_packet_count = |
| 481 | bit_packet_count(tmp_neigh_node->real_bits); |
| 482 | } |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 483 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 484 | |
| 485 | if (need_update) { |
| 486 | bat_dbg(DBG_BATMAN, bat_priv, |
| 487 | "updating last_seqno: old %d, new %d\n", |
| 488 | orig_node->last_real_seqno, batman_packet->seqno); |
| 489 | orig_node->last_real_seqno = batman_packet->seqno; |
| 490 | } |
| 491 | |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 492 | kref_put(&orig_node->refcount, orig_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 493 | return is_duplicate; |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 494 | |
| 495 | err: |
| 496 | kref_put(&orig_node->refcount, orig_node_free_ref); |
| 497 | return -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | /* copy primary address for bonding */ |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 501 | static void mark_bonding_address(struct orig_node *orig_node, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 502 | struct orig_node *orig_neigh_node, |
| 503 | struct batman_packet *batman_packet) |
| 504 | |
| 505 | { |
| 506 | if (batman_packet->flags & PRIMARIES_FIRST_HOP) |
| 507 | memcpy(orig_neigh_node->primary_addr, |
| 508 | orig_node->orig, ETH_ALEN); |
| 509 | |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | /* mark possible bond.candidates in the neighbor list */ |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 514 | void update_bonding_candidates(struct orig_node *orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 515 | { |
| 516 | int candidates; |
| 517 | int interference_candidate; |
| 518 | int best_tq; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 519 | struct hlist_node *node, *node2; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 520 | struct neigh_node *tmp_neigh_node, *tmp_neigh_node2; |
| 521 | struct neigh_node *first_candidate, *last_candidate; |
| 522 | |
| 523 | /* update the candidates for this originator */ |
| 524 | if (!orig_node->router) { |
| 525 | orig_node->bond.candidates = 0; |
| 526 | return; |
| 527 | } |
| 528 | |
| 529 | best_tq = orig_node->router->tq_avg; |
| 530 | |
| 531 | /* update bond.candidates */ |
| 532 | |
| 533 | candidates = 0; |
| 534 | |
| 535 | /* mark other nodes which also received "PRIMARIES FIRST HOP" packets |
| 536 | * as "bonding partner" */ |
| 537 | |
| 538 | /* first, zero the list */ |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 539 | rcu_read_lock(); |
| 540 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 541 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 542 | tmp_neigh_node->next_bond_candidate = NULL; |
| 543 | } |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 544 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 545 | |
| 546 | first_candidate = NULL; |
| 547 | last_candidate = NULL; |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 548 | |
| 549 | rcu_read_lock(); |
| 550 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 551 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 552 | |
| 553 | /* only consider if it has the same primary address ... */ |
| 554 | if (memcmp(orig_node->orig, |
| 555 | tmp_neigh_node->orig_node->primary_addr, |
| 556 | ETH_ALEN) != 0) |
| 557 | continue; |
| 558 | |
| 559 | /* ... and is good enough to be considered */ |
| 560 | if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) |
| 561 | continue; |
| 562 | |
| 563 | /* check if we have another candidate with the same |
| 564 | * mac address or interface. If we do, we won't |
| 565 | * select this candidate because of possible interference. */ |
| 566 | |
| 567 | interference_candidate = 0; |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 568 | hlist_for_each_entry_rcu(tmp_neigh_node2, node2, |
| 569 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 570 | |
| 571 | if (tmp_neigh_node2 == tmp_neigh_node) |
| 572 | continue; |
| 573 | |
| 574 | /* we only care if the other candidate is even |
| 575 | * considered as candidate. */ |
| 576 | if (!tmp_neigh_node2->next_bond_candidate) |
| 577 | continue; |
| 578 | |
| 579 | |
| 580 | if ((tmp_neigh_node->if_incoming == |
| 581 | tmp_neigh_node2->if_incoming) |
| 582 | || (memcmp(tmp_neigh_node->addr, |
| 583 | tmp_neigh_node2->addr, ETH_ALEN) == 0)) { |
| 584 | |
| 585 | interference_candidate = 1; |
| 586 | break; |
| 587 | } |
| 588 | } |
| 589 | /* don't care further if it is an interference candidate */ |
| 590 | if (interference_candidate) |
| 591 | continue; |
| 592 | |
| 593 | if (!first_candidate) { |
| 594 | first_candidate = tmp_neigh_node; |
| 595 | tmp_neigh_node->next_bond_candidate = first_candidate; |
| 596 | } else |
| 597 | tmp_neigh_node->next_bond_candidate = last_candidate; |
| 598 | |
| 599 | last_candidate = tmp_neigh_node; |
| 600 | |
| 601 | candidates++; |
| 602 | } |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 603 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 604 | |
| 605 | if (candidates > 0) { |
| 606 | first_candidate->next_bond_candidate = last_candidate; |
| 607 | orig_node->bond.selected = first_candidate; |
| 608 | } |
| 609 | |
| 610 | orig_node->bond.candidates = candidates; |
| 611 | } |
| 612 | |
| 613 | void receive_bat_packet(struct ethhdr *ethhdr, |
| 614 | struct batman_packet *batman_packet, |
| 615 | unsigned char *hna_buff, int hna_buff_len, |
| 616 | struct batman_if *if_incoming) |
| 617 | { |
| 618 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 619 | struct batman_if *batman_if; |
| 620 | struct orig_node *orig_neigh_node, *orig_node; |
| 621 | char has_directlink_flag; |
| 622 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; |
| 623 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; |
| 624 | char is_duplicate; |
| 625 | uint32_t if_incoming_seqno; |
| 626 | |
| 627 | /* Silently drop when the batman packet is actually not a |
| 628 | * correct packet. |
| 629 | * |
| 630 | * This might happen if a packet is padded (e.g. Ethernet has a |
| 631 | * minimum frame length of 64 byte) and the aggregation interprets |
| 632 | * it as an additional length. |
| 633 | * |
| 634 | * TODO: A more sane solution would be to have a bit in the |
| 635 | * batman_packet to detect whether the packet is the last |
| 636 | * packet in an aggregation. Here we expect that the padding |
| 637 | * is always zero (or not 0x01) |
| 638 | */ |
| 639 | if (batman_packet->packet_type != BAT_PACKET) |
| 640 | return; |
| 641 | |
| 642 | /* could be changed by schedule_own_packet() */ |
| 643 | if_incoming_seqno = atomic_read(&if_incoming->seqno); |
| 644 | |
| 645 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
| 646 | |
| 647 | is_single_hop_neigh = (compare_orig(ethhdr->h_source, |
| 648 | batman_packet->orig) ? 1 : 0); |
| 649 | |
| 650 | bat_dbg(DBG_BATMAN, bat_priv, |
| 651 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " |
| 652 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " |
| 653 | "TTL %d, V %d, IDF %d)\n", |
| 654 | ethhdr->h_source, if_incoming->net_dev->name, |
| 655 | if_incoming->net_dev->dev_addr, batman_packet->orig, |
| 656 | batman_packet->prev_sender, batman_packet->seqno, |
| 657 | batman_packet->tq, batman_packet->ttl, batman_packet->version, |
| 658 | has_directlink_flag); |
| 659 | |
| 660 | rcu_read_lock(); |
| 661 | list_for_each_entry_rcu(batman_if, &if_list, list) { |
| 662 | if (batman_if->if_status != IF_ACTIVE) |
| 663 | continue; |
| 664 | |
| 665 | if (batman_if->soft_iface != if_incoming->soft_iface) |
| 666 | continue; |
| 667 | |
| 668 | if (compare_orig(ethhdr->h_source, |
| 669 | batman_if->net_dev->dev_addr)) |
| 670 | is_my_addr = 1; |
| 671 | |
| 672 | if (compare_orig(batman_packet->orig, |
| 673 | batman_if->net_dev->dev_addr)) |
| 674 | is_my_orig = 1; |
| 675 | |
| 676 | if (compare_orig(batman_packet->prev_sender, |
| 677 | batman_if->net_dev->dev_addr)) |
| 678 | is_my_oldorig = 1; |
| 679 | |
| 680 | if (compare_orig(ethhdr->h_source, broadcast_addr)) |
| 681 | is_broadcast = 1; |
| 682 | } |
| 683 | rcu_read_unlock(); |
| 684 | |
| 685 | if (batman_packet->version != COMPAT_VERSION) { |
| 686 | bat_dbg(DBG_BATMAN, bat_priv, |
| 687 | "Drop packet: incompatible batman version (%i)\n", |
| 688 | batman_packet->version); |
| 689 | return; |
| 690 | } |
| 691 | |
| 692 | if (is_my_addr) { |
| 693 | bat_dbg(DBG_BATMAN, bat_priv, |
| 694 | "Drop packet: received my own broadcast (sender: %pM" |
| 695 | ")\n", |
| 696 | ethhdr->h_source); |
| 697 | return; |
| 698 | } |
| 699 | |
| 700 | if (is_broadcast) { |
| 701 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
| 702 | "ignoring all packets with broadcast source addr (sender: %pM" |
| 703 | ")\n", ethhdr->h_source); |
| 704 | return; |
| 705 | } |
| 706 | |
| 707 | if (is_my_orig) { |
| 708 | unsigned long *word; |
| 709 | int offset; |
| 710 | |
| 711 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 712 | if (!orig_neigh_node) |
| 713 | return; |
| 714 | |
| 715 | /* neighbor has to indicate direct link and it has to |
| 716 | * come via the corresponding interface */ |
| 717 | /* if received seqno equals last send seqno save new |
| 718 | * seqno for bidirectional check */ |
| 719 | if (has_directlink_flag && |
| 720 | compare_orig(if_incoming->net_dev->dev_addr, |
| 721 | batman_packet->orig) && |
| 722 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
| 723 | offset = if_incoming->if_num * NUM_WORDS; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 724 | |
| 725 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 726 | word = &(orig_neigh_node->bcast_own[offset]); |
| 727 | bit_mark(word, 0); |
| 728 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = |
| 729 | bit_packet_count(word); |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame^] | 730 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
| 734 | "originator packet from myself (via neighbor)\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 735 | kref_put(&orig_neigh_node->refcount, orig_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 736 | return; |
| 737 | } |
| 738 | |
| 739 | if (is_my_oldorig) { |
| 740 | bat_dbg(DBG_BATMAN, bat_priv, |
| 741 | "Drop packet: ignoring all rebroadcast echos (sender: " |
| 742 | "%pM)\n", ethhdr->h_source); |
| 743 | return; |
| 744 | } |
| 745 | |
| 746 | orig_node = get_orig_node(bat_priv, batman_packet->orig); |
| 747 | if (!orig_node) |
| 748 | return; |
| 749 | |
| 750 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); |
| 751 | |
| 752 | if (is_duplicate == -1) { |
| 753 | bat_dbg(DBG_BATMAN, bat_priv, |
| 754 | "Drop packet: packet within seqno protection time " |
| 755 | "(sender: %pM)\n", ethhdr->h_source); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 756 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | if (batman_packet->tq == 0) { |
| 760 | bat_dbg(DBG_BATMAN, bat_priv, |
| 761 | "Drop packet: originator packet with tq equal 0\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 762 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | /* avoid temporary routing loops */ |
| 766 | if ((orig_node->router) && |
| 767 | (orig_node->router->orig_node->router) && |
| 768 | (compare_orig(orig_node->router->addr, |
| 769 | batman_packet->prev_sender)) && |
| 770 | !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && |
| 771 | (compare_orig(orig_node->router->addr, |
| 772 | orig_node->router->orig_node->router->addr))) { |
| 773 | bat_dbg(DBG_BATMAN, bat_priv, |
| 774 | "Drop packet: ignoring all rebroadcast packets that " |
| 775 | "may make me loop (sender: %pM)\n", ethhdr->h_source); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 776 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 777 | } |
| 778 | |
| 779 | /* if sender is a direct neighbor the sender mac equals |
| 780 | * originator mac */ |
| 781 | orig_neigh_node = (is_single_hop_neigh ? |
| 782 | orig_node : |
| 783 | get_orig_node(bat_priv, ethhdr->h_source)); |
| 784 | if (!orig_neigh_node) |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 785 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 786 | |
| 787 | /* drop packet if sender is not a direct neighbor and if we |
| 788 | * don't route towards it */ |
| 789 | if (!is_single_hop_neigh && (!orig_neigh_node->router)) { |
| 790 | bat_dbg(DBG_BATMAN, bat_priv, |
| 791 | "Drop packet: OGM via unknown neighbor!\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 792 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 793 | } |
| 794 | |
| 795 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, |
| 796 | batman_packet, if_incoming); |
| 797 | |
| 798 | /* update ranking if it is not a duplicate or has the same |
| 799 | * seqno and similar ttl as the non-duplicate */ |
| 800 | if (is_bidirectional && |
| 801 | (!is_duplicate || |
| 802 | ((orig_node->last_real_seqno == batman_packet->seqno) && |
| 803 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) |
| 804 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, |
| 805 | if_incoming, hna_buff, hna_buff_len, is_duplicate); |
| 806 | |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 807 | mark_bonding_address(orig_node, orig_neigh_node, batman_packet); |
| 808 | update_bonding_candidates(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 809 | |
| 810 | /* is single hop (direct) neighbor */ |
| 811 | if (is_single_hop_neigh) { |
| 812 | |
| 813 | /* mark direct link on incoming interface */ |
| 814 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
| 815 | 1, hna_buff_len, if_incoming); |
| 816 | |
| 817 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " |
| 818 | "rebroadcast neighbor packet with direct link flag\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 819 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 820 | } |
| 821 | |
| 822 | /* multihop originator */ |
| 823 | if (!is_bidirectional) { |
| 824 | bat_dbg(DBG_BATMAN, bat_priv, |
| 825 | "Drop packet: not received via bidirectional link\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 826 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | if (is_duplicate) { |
| 830 | bat_dbg(DBG_BATMAN, bat_priv, |
| 831 | "Drop packet: duplicate packet received\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 832 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | bat_dbg(DBG_BATMAN, bat_priv, |
| 836 | "Forwarding packet: rebroadcast originator packet\n"); |
| 837 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
| 838 | 0, hna_buff_len, if_incoming); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 839 | |
| 840 | out_neigh: |
| 841 | if (!is_single_hop_neigh) |
| 842 | kref_put(&orig_neigh_node->refcount, orig_node_free_ref); |
| 843 | out: |
| 844 | kref_put(&orig_node->refcount, orig_node_free_ref); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 845 | } |
| 846 | |
| 847 | int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) |
| 848 | { |
| 849 | struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); |
| 850 | struct ethhdr *ethhdr; |
| 851 | |
| 852 | /* drop packet if it has not necessary minimum size */ |
| 853 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) |
| 854 | return NET_RX_DROP; |
| 855 | |
| 856 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 857 | |
| 858 | /* packet with broadcast indication but unicast recipient */ |
| 859 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
| 860 | return NET_RX_DROP; |
| 861 | |
| 862 | /* packet with broadcast sender address */ |
| 863 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 864 | return NET_RX_DROP; |
| 865 | |
| 866 | /* create a copy of the skb, if needed, to modify it. */ |
| 867 | if (skb_cow(skb, 0) < 0) |
| 868 | return NET_RX_DROP; |
| 869 | |
| 870 | /* keep skb linear */ |
| 871 | if (skb_linearize(skb) < 0) |
| 872 | return NET_RX_DROP; |
| 873 | |
| 874 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 875 | |
| 876 | spin_lock_bh(&bat_priv->orig_hash_lock); |
| 877 | receive_aggr_bat_packet(ethhdr, |
| 878 | skb->data, |
| 879 | skb_headlen(skb), |
| 880 | batman_if); |
| 881 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 882 | |
| 883 | kfree_skb(skb); |
| 884 | return NET_RX_SUCCESS; |
| 885 | } |
| 886 | |
| 887 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, |
| 888 | struct sk_buff *skb, size_t icmp_len) |
| 889 | { |
| 890 | struct orig_node *orig_node; |
| 891 | struct icmp_packet_rr *icmp_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 892 | struct batman_if *batman_if; |
| 893 | int ret; |
| 894 | uint8_t dstaddr[ETH_ALEN]; |
| 895 | |
| 896 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 897 | |
| 898 | /* add data to device queue */ |
| 899 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 900 | bat_socket_receive_packet(icmp_packet, icmp_len); |
| 901 | return NET_RX_DROP; |
| 902 | } |
| 903 | |
| 904 | if (!bat_priv->primary_if) |
| 905 | return NET_RX_DROP; |
| 906 | |
| 907 | /* answer echo request (ping) */ |
| 908 | /* get routing information */ |
| 909 | spin_lock_bh(&bat_priv->orig_hash_lock); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 910 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 911 | orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, |
| 912 | compare_orig, choose_orig, |
| 913 | icmp_packet->orig)); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 914 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 915 | ret = NET_RX_DROP; |
| 916 | |
| 917 | if ((orig_node) && (orig_node->router)) { |
| 918 | |
| 919 | /* don't lock while sending the packets ... we therefore |
| 920 | * copy the required data before sending */ |
| 921 | batman_if = orig_node->router->if_incoming; |
| 922 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
| 923 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 924 | |
| 925 | /* create a copy of the skb, if needed, to modify it. */ |
| 926 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 927 | return NET_RX_DROP; |
| 928 | |
| 929 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 930 | |
| 931 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
| 932 | memcpy(icmp_packet->orig, |
| 933 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); |
| 934 | icmp_packet->msg_type = ECHO_REPLY; |
| 935 | icmp_packet->ttl = TTL; |
| 936 | |
| 937 | send_skb_packet(skb, batman_if, dstaddr); |
| 938 | ret = NET_RX_SUCCESS; |
| 939 | |
| 940 | } else |
| 941 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 942 | |
| 943 | return ret; |
| 944 | } |
| 945 | |
| 946 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 947 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 948 | { |
| 949 | struct orig_node *orig_node; |
| 950 | struct icmp_packet *icmp_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 951 | struct batman_if *batman_if; |
| 952 | int ret; |
| 953 | uint8_t dstaddr[ETH_ALEN]; |
| 954 | |
| 955 | icmp_packet = (struct icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 956 | |
| 957 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
| 958 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 959 | pr_debug("Warning - can't forward icmp packet from %pM to " |
| 960 | "%pM: ttl exceeded\n", icmp_packet->orig, |
| 961 | icmp_packet->dst); |
| 962 | return NET_RX_DROP; |
| 963 | } |
| 964 | |
| 965 | if (!bat_priv->primary_if) |
| 966 | return NET_RX_DROP; |
| 967 | |
| 968 | /* get routing information */ |
| 969 | spin_lock_bh(&bat_priv->orig_hash_lock); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 970 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 971 | orig_node = ((struct orig_node *) |
| 972 | hash_find(bat_priv->orig_hash, compare_orig, choose_orig, |
| 973 | icmp_packet->orig)); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 974 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 975 | ret = NET_RX_DROP; |
| 976 | |
| 977 | if ((orig_node) && (orig_node->router)) { |
| 978 | |
| 979 | /* don't lock while sending the packets ... we therefore |
| 980 | * copy the required data before sending */ |
| 981 | batman_if = orig_node->router->if_incoming; |
| 982 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
| 983 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 984 | |
| 985 | /* create a copy of the skb, if needed, to modify it. */ |
| 986 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 987 | return NET_RX_DROP; |
| 988 | |
| 989 | icmp_packet = (struct icmp_packet *) skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 990 | |
| 991 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
| 992 | memcpy(icmp_packet->orig, |
| 993 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); |
| 994 | icmp_packet->msg_type = TTL_EXCEEDED; |
| 995 | icmp_packet->ttl = TTL; |
| 996 | |
| 997 | send_skb_packet(skb, batman_if, dstaddr); |
| 998 | ret = NET_RX_SUCCESS; |
| 999 | |
| 1000 | } else |
| 1001 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1002 | |
| 1003 | return ret; |
| 1004 | } |
| 1005 | |
| 1006 | |
| 1007 | int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) |
| 1008 | { |
| 1009 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1010 | struct icmp_packet_rr *icmp_packet; |
| 1011 | struct ethhdr *ethhdr; |
| 1012 | struct orig_node *orig_node; |
| 1013 | struct batman_if *batman_if; |
| 1014 | int hdr_size = sizeof(struct icmp_packet); |
| 1015 | int ret; |
| 1016 | uint8_t dstaddr[ETH_ALEN]; |
| 1017 | |
| 1018 | /** |
| 1019 | * we truncate all incoming icmp packets if they don't match our size |
| 1020 | */ |
| 1021 | if (skb->len >= sizeof(struct icmp_packet_rr)) |
| 1022 | hdr_size = sizeof(struct icmp_packet_rr); |
| 1023 | |
| 1024 | /* drop packet if it has not necessary minimum size */ |
| 1025 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1026 | return NET_RX_DROP; |
| 1027 | |
| 1028 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1029 | |
| 1030 | /* packet with unicast indication but broadcast recipient */ |
| 1031 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 1032 | return NET_RX_DROP; |
| 1033 | |
| 1034 | /* packet with broadcast sender address */ |
| 1035 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 1036 | return NET_RX_DROP; |
| 1037 | |
| 1038 | /* not for me */ |
| 1039 | if (!is_my_mac(ethhdr->h_dest)) |
| 1040 | return NET_RX_DROP; |
| 1041 | |
| 1042 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
| 1043 | |
| 1044 | /* add record route information if not full */ |
| 1045 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && |
| 1046 | (icmp_packet->rr_cur < BAT_RR_LEN)) { |
| 1047 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
| 1048 | ethhdr->h_dest, ETH_ALEN); |
| 1049 | icmp_packet->rr_cur++; |
| 1050 | } |
| 1051 | |
| 1052 | /* packet for me */ |
| 1053 | if (is_my_mac(icmp_packet->dst)) |
| 1054 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); |
| 1055 | |
| 1056 | /* TTL exceeded */ |
| 1057 | if (icmp_packet->ttl < 2) |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 1058 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1059 | |
| 1060 | ret = NET_RX_DROP; |
| 1061 | |
| 1062 | /* get routing information */ |
| 1063 | spin_lock_bh(&bat_priv->orig_hash_lock); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1064 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1065 | orig_node = ((struct orig_node *) |
| 1066 | hash_find(bat_priv->orig_hash, compare_orig, choose_orig, |
| 1067 | icmp_packet->dst)); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1068 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1069 | |
| 1070 | if ((orig_node) && (orig_node->router)) { |
| 1071 | |
| 1072 | /* don't lock while sending the packets ... we therefore |
| 1073 | * copy the required data before sending */ |
| 1074 | batman_if = orig_node->router->if_incoming; |
| 1075 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
| 1076 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1077 | |
| 1078 | /* create a copy of the skb, if needed, to modify it. */ |
| 1079 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 1080 | return NET_RX_DROP; |
| 1081 | |
| 1082 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1083 | |
| 1084 | /* decrement ttl */ |
| 1085 | icmp_packet->ttl--; |
| 1086 | |
| 1087 | /* route it */ |
| 1088 | send_skb_packet(skb, batman_if, dstaddr); |
| 1089 | ret = NET_RX_SUCCESS; |
| 1090 | |
| 1091 | } else |
| 1092 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1093 | |
| 1094 | return ret; |
| 1095 | } |
| 1096 | |
| 1097 | /* find a suitable router for this originator, and use |
| 1098 | * bonding if possible. */ |
| 1099 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
| 1100 | struct orig_node *orig_node, |
| 1101 | struct batman_if *recv_if) |
| 1102 | { |
| 1103 | struct orig_node *primary_orig_node; |
| 1104 | struct orig_node *router_orig; |
| 1105 | struct neigh_node *router, *first_candidate, *best_router; |
| 1106 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
| 1107 | int bonding_enabled; |
| 1108 | |
| 1109 | if (!orig_node) |
| 1110 | return NULL; |
| 1111 | |
| 1112 | if (!orig_node->router) |
| 1113 | return NULL; |
| 1114 | |
| 1115 | /* without bonding, the first node should |
| 1116 | * always choose the default router. */ |
| 1117 | |
| 1118 | bonding_enabled = atomic_read(&bat_priv->bonding); |
| 1119 | |
| 1120 | if ((!recv_if) && (!bonding_enabled)) |
| 1121 | return orig_node->router; |
| 1122 | |
| 1123 | router_orig = orig_node->router->orig_node; |
| 1124 | |
| 1125 | /* if we have something in the primary_addr, we can search |
| 1126 | * for a potential bonding candidate. */ |
| 1127 | if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0) |
| 1128 | return orig_node->router; |
| 1129 | |
| 1130 | /* find the orig_node which has the primary interface. might |
| 1131 | * even be the same as our router_orig in many cases */ |
| 1132 | |
| 1133 | if (memcmp(router_orig->primary_addr, |
| 1134 | router_orig->orig, ETH_ALEN) == 0) { |
| 1135 | primary_orig_node = router_orig; |
| 1136 | } else { |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1137 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1138 | primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig, |
| 1139 | choose_orig, |
| 1140 | router_orig->primary_addr); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1141 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1142 | |
| 1143 | if (!primary_orig_node) |
| 1144 | return orig_node->router; |
| 1145 | } |
| 1146 | |
| 1147 | /* with less than 2 candidates, we can't do any |
| 1148 | * bonding and prefer the original router. */ |
| 1149 | |
| 1150 | if (primary_orig_node->bond.candidates < 2) |
| 1151 | return orig_node->router; |
| 1152 | |
| 1153 | |
| 1154 | /* all nodes between should choose a candidate which |
| 1155 | * is is not on the interface where the packet came |
| 1156 | * in. */ |
| 1157 | first_candidate = primary_orig_node->bond.selected; |
| 1158 | router = first_candidate; |
| 1159 | |
| 1160 | if (bonding_enabled) { |
| 1161 | /* in the bonding case, send the packets in a round |
| 1162 | * robin fashion over the remaining interfaces. */ |
| 1163 | do { |
| 1164 | /* recv_if == NULL on the first node. */ |
| 1165 | if (router->if_incoming != recv_if) |
| 1166 | break; |
| 1167 | |
| 1168 | router = router->next_bond_candidate; |
| 1169 | } while (router != first_candidate); |
| 1170 | |
| 1171 | primary_orig_node->bond.selected = router->next_bond_candidate; |
| 1172 | |
| 1173 | } else { |
| 1174 | /* if bonding is disabled, use the best of the |
| 1175 | * remaining candidates which are not using |
| 1176 | * this interface. */ |
| 1177 | best_router = first_candidate; |
| 1178 | |
| 1179 | do { |
| 1180 | /* recv_if == NULL on the first node. */ |
| 1181 | if ((router->if_incoming != recv_if) && |
| 1182 | (router->tq_avg > best_router->tq_avg)) |
| 1183 | best_router = router; |
| 1184 | |
| 1185 | router = router->next_bond_candidate; |
| 1186 | } while (router != first_candidate); |
| 1187 | |
| 1188 | router = best_router; |
| 1189 | } |
| 1190 | |
| 1191 | return router; |
| 1192 | } |
| 1193 | |
| 1194 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) |
| 1195 | { |
| 1196 | struct ethhdr *ethhdr; |
| 1197 | |
| 1198 | /* drop packet if it has not necessary minimum size */ |
| 1199 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1200 | return -1; |
| 1201 | |
| 1202 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1203 | |
| 1204 | /* packet with unicast indication but broadcast recipient */ |
| 1205 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 1206 | return -1; |
| 1207 | |
| 1208 | /* packet with broadcast sender address */ |
| 1209 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 1210 | return -1; |
| 1211 | |
| 1212 | /* not for me */ |
| 1213 | if (!is_my_mac(ethhdr->h_dest)) |
| 1214 | return -1; |
| 1215 | |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, |
| 1220 | int hdr_size) |
| 1221 | { |
| 1222 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1223 | struct orig_node *orig_node; |
| 1224 | struct neigh_node *router; |
| 1225 | struct batman_if *batman_if; |
| 1226 | uint8_t dstaddr[ETH_ALEN]; |
| 1227 | struct unicast_packet *unicast_packet; |
| 1228 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1229 | int ret; |
| 1230 | struct sk_buff *new_skb; |
| 1231 | |
| 1232 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1233 | |
| 1234 | /* TTL exceeded */ |
| 1235 | if (unicast_packet->ttl < 2) { |
| 1236 | pr_debug("Warning - can't forward unicast packet from %pM to " |
| 1237 | "%pM: ttl exceeded\n", ethhdr->h_source, |
| 1238 | unicast_packet->dest); |
| 1239 | return NET_RX_DROP; |
| 1240 | } |
| 1241 | |
| 1242 | /* get routing information */ |
| 1243 | spin_lock_bh(&bat_priv->orig_hash_lock); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1244 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1245 | orig_node = ((struct orig_node *) |
| 1246 | hash_find(bat_priv->orig_hash, compare_orig, choose_orig, |
| 1247 | unicast_packet->dest)); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1248 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1249 | |
| 1250 | router = find_router(bat_priv, orig_node, recv_if); |
| 1251 | |
| 1252 | if (!router) { |
| 1253 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1254 | return NET_RX_DROP; |
| 1255 | } |
| 1256 | |
| 1257 | /* don't lock while sending the packets ... we therefore |
| 1258 | * copy the required data before sending */ |
| 1259 | |
| 1260 | batman_if = router->if_incoming; |
| 1261 | memcpy(dstaddr, router->addr, ETH_ALEN); |
| 1262 | |
| 1263 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1264 | |
| 1265 | /* create a copy of the skb, if needed, to modify it. */ |
| 1266 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 1267 | return NET_RX_DROP; |
| 1268 | |
| 1269 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1270 | |
| 1271 | if (unicast_packet->packet_type == BAT_UNICAST && |
| 1272 | atomic_read(&bat_priv->fragmentation) && |
| 1273 | skb->len > batman_if->net_dev->mtu) |
| 1274 | return frag_send_skb(skb, bat_priv, batman_if, |
| 1275 | dstaddr); |
| 1276 | |
| 1277 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && |
Sven Eckelmann | ae361ce | 2011-01-25 22:02:31 +0000 | [diff] [blame] | 1278 | frag_can_reassemble(skb, batman_if->net_dev->mtu)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1279 | |
| 1280 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 1281 | |
| 1282 | if (ret == NET_RX_DROP) |
| 1283 | return NET_RX_DROP; |
| 1284 | |
| 1285 | /* packet was buffered for late merge */ |
| 1286 | if (!new_skb) |
| 1287 | return NET_RX_SUCCESS; |
| 1288 | |
| 1289 | skb = new_skb; |
| 1290 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1291 | } |
| 1292 | |
| 1293 | /* decrement ttl */ |
| 1294 | unicast_packet->ttl--; |
| 1295 | |
| 1296 | /* route it */ |
| 1297 | send_skb_packet(skb, batman_if, dstaddr); |
| 1298 | |
| 1299 | return NET_RX_SUCCESS; |
| 1300 | } |
| 1301 | |
| 1302 | int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) |
| 1303 | { |
| 1304 | struct unicast_packet *unicast_packet; |
| 1305 | int hdr_size = sizeof(struct unicast_packet); |
| 1306 | |
| 1307 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 1308 | return NET_RX_DROP; |
| 1309 | |
| 1310 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1311 | |
| 1312 | /* packet for me */ |
| 1313 | if (is_my_mac(unicast_packet->dest)) { |
| 1314 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
| 1315 | return NET_RX_SUCCESS; |
| 1316 | } |
| 1317 | |
| 1318 | return route_unicast_packet(skb, recv_if, hdr_size); |
| 1319 | } |
| 1320 | |
| 1321 | int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) |
| 1322 | { |
| 1323 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1324 | struct unicast_frag_packet *unicast_packet; |
| 1325 | int hdr_size = sizeof(struct unicast_frag_packet); |
| 1326 | struct sk_buff *new_skb = NULL; |
| 1327 | int ret; |
| 1328 | |
| 1329 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 1330 | return NET_RX_DROP; |
| 1331 | |
| 1332 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
| 1333 | |
| 1334 | /* packet for me */ |
| 1335 | if (is_my_mac(unicast_packet->dest)) { |
| 1336 | |
| 1337 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 1338 | |
| 1339 | if (ret == NET_RX_DROP) |
| 1340 | return NET_RX_DROP; |
| 1341 | |
| 1342 | /* packet was buffered for late merge */ |
| 1343 | if (!new_skb) |
| 1344 | return NET_RX_SUCCESS; |
| 1345 | |
| 1346 | interface_rx(recv_if->soft_iface, new_skb, recv_if, |
| 1347 | sizeof(struct unicast_packet)); |
| 1348 | return NET_RX_SUCCESS; |
| 1349 | } |
| 1350 | |
| 1351 | return route_unicast_packet(skb, recv_if, hdr_size); |
| 1352 | } |
| 1353 | |
| 1354 | |
| 1355 | int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) |
| 1356 | { |
| 1357 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1358 | struct orig_node *orig_node; |
| 1359 | struct bcast_packet *bcast_packet; |
| 1360 | struct ethhdr *ethhdr; |
| 1361 | int hdr_size = sizeof(struct bcast_packet); |
| 1362 | int32_t seq_diff; |
| 1363 | |
| 1364 | /* drop packet if it has not necessary minimum size */ |
| 1365 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1366 | return NET_RX_DROP; |
| 1367 | |
| 1368 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1369 | |
| 1370 | /* packet with broadcast indication but unicast recipient */ |
| 1371 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
| 1372 | return NET_RX_DROP; |
| 1373 | |
| 1374 | /* packet with broadcast sender address */ |
| 1375 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 1376 | return NET_RX_DROP; |
| 1377 | |
| 1378 | /* ignore broadcasts sent by myself */ |
| 1379 | if (is_my_mac(ethhdr->h_source)) |
| 1380 | return NET_RX_DROP; |
| 1381 | |
| 1382 | bcast_packet = (struct bcast_packet *)skb->data; |
| 1383 | |
| 1384 | /* ignore broadcasts originated by myself */ |
| 1385 | if (is_my_mac(bcast_packet->orig)) |
| 1386 | return NET_RX_DROP; |
| 1387 | |
| 1388 | if (bcast_packet->ttl < 2) |
| 1389 | return NET_RX_DROP; |
| 1390 | |
| 1391 | spin_lock_bh(&bat_priv->orig_hash_lock); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1392 | rcu_read_lock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1393 | orig_node = ((struct orig_node *) |
| 1394 | hash_find(bat_priv->orig_hash, compare_orig, choose_orig, |
| 1395 | bcast_packet->orig)); |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 1396 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1397 | |
| 1398 | if (!orig_node) { |
| 1399 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1400 | return NET_RX_DROP; |
| 1401 | } |
| 1402 | |
| 1403 | /* check whether the packet is a duplicate */ |
| 1404 | if (get_bit_status(orig_node->bcast_bits, |
| 1405 | orig_node->last_bcast_seqno, |
| 1406 | ntohl(bcast_packet->seqno))) { |
| 1407 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1408 | return NET_RX_DROP; |
| 1409 | } |
| 1410 | |
| 1411 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; |
| 1412 | |
| 1413 | /* check whether the packet is old and the host just restarted. */ |
| 1414 | if (window_protected(bat_priv, seq_diff, |
| 1415 | &orig_node->bcast_seqno_reset)) { |
| 1416 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1417 | return NET_RX_DROP; |
| 1418 | } |
| 1419 | |
| 1420 | /* mark broadcast in flood history, update window position |
| 1421 | * if required. */ |
| 1422 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
| 1423 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
| 1424 | |
| 1425 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
| 1426 | /* rebroadcast packet */ |
| 1427 | add_bcast_packet_to_list(bat_priv, skb); |
| 1428 | |
| 1429 | /* broadcast for me */ |
| 1430 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
| 1431 | |
| 1432 | return NET_RX_SUCCESS; |
| 1433 | } |
| 1434 | |
| 1435 | int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if) |
| 1436 | { |
| 1437 | struct vis_packet *vis_packet; |
| 1438 | struct ethhdr *ethhdr; |
| 1439 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1440 | int hdr_size = sizeof(struct vis_packet); |
| 1441 | |
| 1442 | /* keep skb linear */ |
| 1443 | if (skb_linearize(skb) < 0) |
| 1444 | return NET_RX_DROP; |
| 1445 | |
| 1446 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1447 | return NET_RX_DROP; |
| 1448 | |
| 1449 | vis_packet = (struct vis_packet *)skb->data; |
| 1450 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1451 | |
| 1452 | /* not for me */ |
| 1453 | if (!is_my_mac(ethhdr->h_dest)) |
| 1454 | return NET_RX_DROP; |
| 1455 | |
| 1456 | /* ignore own packets */ |
| 1457 | if (is_my_mac(vis_packet->vis_orig)) |
| 1458 | return NET_RX_DROP; |
| 1459 | |
| 1460 | if (is_my_mac(vis_packet->sender_orig)) |
| 1461 | return NET_RX_DROP; |
| 1462 | |
| 1463 | switch (vis_packet->vis_type) { |
| 1464 | case VIS_TYPE_SERVER_SYNC: |
| 1465 | receive_server_sync_packet(bat_priv, vis_packet, |
| 1466 | skb_headlen(skb)); |
| 1467 | break; |
| 1468 | |
| 1469 | case VIS_TYPE_CLIENT_UPDATE: |
| 1470 | receive_client_update_packet(bat_priv, vis_packet, |
| 1471 | skb_headlen(skb)); |
| 1472 | break; |
| 1473 | |
| 1474 | default: /* ignore unknown packet */ |
| 1475 | break; |
| 1476 | } |
| 1477 | |
| 1478 | /* We take a copy of the data in the packet, so we should |
| 1479 | always free the skbuf. */ |
| 1480 | return NET_RX_DROP; |
| 1481 | } |