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 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 38 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 39 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 40 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 41 | struct hashtable_t *hash = bat_priv->orig_hash; |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 42 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 43 | struct hlist_head *head; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 44 | struct orig_node *orig_node; |
| 45 | unsigned long *word; |
| 46 | int i; |
| 47 | size_t word_index; |
| 48 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 49 | for (i = 0; i < hash->size; i++) { |
| 50 | head = &hash->table[i]; |
| 51 | |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 52 | rcu_read_lock(); |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 53 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 54 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 55 | word_index = hard_iface->if_num * NUM_WORDS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 56 | word = &(orig_node->bcast_own[word_index]); |
| 57 | |
| 58 | bit_get_packet(bat_priv, word, 1, 0); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 59 | orig_node->bcast_own_sum[hard_iface->if_num] = |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 60 | bit_packet_count(word); |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 61 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 62 | } |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 63 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 64 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 65 | } |
| 66 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 67 | static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 68 | const unsigned char *tt_buff, int tt_buff_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 69 | { |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 70 | if ((tt_buff_len != orig_node->tt_buff_len) || |
| 71 | ((tt_buff_len > 0) && |
| 72 | (orig_node->tt_buff_len > 0) && |
| 73 | (memcmp(orig_node->tt_buff, tt_buff, tt_buff_len) != 0))) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 74 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 75 | if (orig_node->tt_buff_len > 0) |
| 76 | tt_global_del_orig(bat_priv, orig_node, |
| 77 | "originator changed tt"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 78 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 79 | if ((tt_buff_len > 0) && (tt_buff)) |
| 80 | tt_global_add_orig(bat_priv, orig_node, |
| 81 | tt_buff, tt_buff_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 82 | } |
| 83 | } |
| 84 | |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 85 | static void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 86 | struct neigh_node *neigh_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 87 | const unsigned char *tt_buff, int tt_buff_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 88 | { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 89 | struct neigh_node *curr_router; |
| 90 | |
| 91 | curr_router = orig_node_get_router(orig_node); |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 92 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 93 | /* route deleted */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 94 | if ((curr_router) && (!neigh_node)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 95 | |
| 96 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
| 97 | orig_node->orig); |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 98 | tt_global_del_orig(bat_priv, orig_node, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 99 | "originator timed out"); |
| 100 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 101 | /* route added */ |
| 102 | } else if ((!curr_router) && (neigh_node)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 103 | |
| 104 | bat_dbg(DBG_ROUTES, bat_priv, |
| 105 | "Adding route towards: %pM (via %pM)\n", |
| 106 | orig_node->orig, neigh_node->addr); |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 107 | tt_global_add_orig(bat_priv, orig_node, |
| 108 | tt_buff, tt_buff_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 109 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 110 | /* route changed */ |
Sven Eckelmann | bb899b8 | 2011-05-10 11:22:37 +0200 | [diff] [blame^] | 111 | } else if (neigh_node && curr_router) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 112 | bat_dbg(DBG_ROUTES, bat_priv, |
| 113 | "Changing route towards: %pM " |
| 114 | "(now via %pM - was via %pM)\n", |
| 115 | orig_node->orig, neigh_node->addr, |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 116 | curr_router->addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 117 | } |
| 118 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 119 | if (curr_router) |
| 120 | neigh_node_free_ref(curr_router); |
| 121 | |
| 122 | /* increase refcount of new best neighbor */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 123 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
| 124 | neigh_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 125 | |
| 126 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 127 | rcu_assign_pointer(orig_node->router, neigh_node); |
| 128 | spin_unlock_bh(&orig_node->neigh_list_lock); |
| 129 | |
| 130 | /* decrease refcount of previous best neighbor */ |
| 131 | if (curr_router) |
| 132 | neigh_node_free_ref(curr_router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 133 | } |
| 134 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 135 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 136 | struct neigh_node *neigh_node, const unsigned char *tt_buff, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 137 | int tt_buff_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 138 | { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 139 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 140 | |
| 141 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 142 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 143 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 144 | router = orig_node_get_router(orig_node); |
| 145 | |
| 146 | if (router != neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 147 | update_route(bat_priv, orig_node, neigh_node, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 148 | tt_buff, tt_buff_len); |
| 149 | /* may be just TT changed */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 150 | else |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 151 | update_TT(bat_priv, orig_node, tt_buff, tt_buff_len); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 152 | |
| 153 | out: |
| 154 | if (router) |
| 155 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | static int is_bidirectional_neigh(struct orig_node *orig_node, |
| 159 | struct orig_node *orig_neigh_node, |
| 160 | struct batman_packet *batman_packet, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 161 | struct hard_iface *if_incoming) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 162 | { |
| 163 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
Marek Lindner | 1605d0d | 2011-02-18 12:28:11 +0000 | [diff] [blame] | 164 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 165 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 166 | unsigned char total_count; |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 167 | uint8_t orig_eq_count, neigh_rq_count, tq_own; |
| 168 | int tq_asym_penalty, ret = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 169 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 170 | /* find corresponding one hop neighbor */ |
| 171 | rcu_read_lock(); |
| 172 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 173 | &orig_neigh_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 174 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 175 | if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig)) |
| 176 | continue; |
Marek Lindner | 1605d0d | 2011-02-18 12:28:11 +0000 | [diff] [blame] | 177 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 178 | if (tmp_neigh_node->if_incoming != if_incoming) |
| 179 | continue; |
Marek Lindner | 1605d0d | 2011-02-18 12:28:11 +0000 | [diff] [blame] | 180 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 181 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| 182 | continue; |
Marek Lindner | 1605d0d | 2011-02-18 12:28:11 +0000 | [diff] [blame] | 183 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 184 | neigh_node = tmp_neigh_node; |
| 185 | break; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 186 | } |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 187 | rcu_read_unlock(); |
| 188 | |
| 189 | if (!neigh_node) |
| 190 | neigh_node = create_neighbor(orig_neigh_node, |
| 191 | orig_neigh_node, |
| 192 | orig_neigh_node->orig, |
| 193 | if_incoming); |
| 194 | |
| 195 | if (!neigh_node) |
| 196 | goto out; |
| 197 | |
| 198 | /* if orig_node is direct neighbour update neigh_node last_valid */ |
| 199 | if (orig_node == orig_neigh_node) |
| 200 | neigh_node->last_valid = jiffies; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 201 | |
| 202 | orig_node->last_valid = jiffies; |
| 203 | |
Daniele Furlan | 27aea21 | 2011-05-07 22:45:19 +0200 | [diff] [blame] | 204 | /* find packet count of corresponding one hop neighbor */ |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 205 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
| 206 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; |
| 207 | neigh_rq_count = neigh_node->real_packet_count; |
| 208 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
| 209 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 210 | /* pay attention to not get a value bigger than 100 % */ |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 211 | total_count = (orig_eq_count > neigh_rq_count ? |
| 212 | neigh_rq_count : orig_eq_count); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 213 | |
| 214 | /* if we have too few packets (too less data) we set tq_own to zero */ |
| 215 | /* if we receive too few packets it is not considered bidirectional */ |
| 216 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 217 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
| 218 | tq_own = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 219 | else |
| 220 | /* neigh_node->real_packet_count is never zero as we |
| 221 | * only purge old information when getting new |
| 222 | * information */ |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 223 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 224 | |
| 225 | /* |
| 226 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
| 227 | * affect the nearly-symmetric links only a little, but |
| 228 | * punishes asymmetric links more. This will give a value |
| 229 | * between 0 and TQ_MAX_VALUE |
| 230 | */ |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 231 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
| 232 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * |
| 233 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * |
| 234 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / |
| 235 | (TQ_LOCAL_WINDOW_SIZE * |
| 236 | TQ_LOCAL_WINDOW_SIZE * |
| 237 | TQ_LOCAL_WINDOW_SIZE); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 238 | |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 239 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / |
| 240 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 241 | |
| 242 | bat_dbg(DBG_BATMAN, bat_priv, |
| 243 | "bidirectional: " |
| 244 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " |
| 245 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " |
| 246 | "total tq: %3i\n", |
| 247 | orig_node->orig, orig_neigh_node->orig, total_count, |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 248 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 249 | |
| 250 | /* if link has the minimum required transmission quality |
| 251 | * consider it bidirectional */ |
| 252 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 253 | ret = 1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 254 | |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 255 | out: |
| 256 | if (neigh_node) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 257 | neigh_node_free_ref(neigh_node); |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 258 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 259 | } |
| 260 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 261 | /* caller must hold the neigh_list_lock */ |
| 262 | void bonding_candidate_del(struct orig_node *orig_node, |
| 263 | struct neigh_node *neigh_node) |
| 264 | { |
| 265 | /* this neighbor is not part of our candidate list */ |
| 266 | if (list_empty(&neigh_node->bonding_list)) |
| 267 | goto out; |
| 268 | |
| 269 | list_del_rcu(&neigh_node->bonding_list); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 270 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 271 | neigh_node_free_ref(neigh_node); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 272 | atomic_dec(&orig_node->bond_candidates); |
| 273 | |
| 274 | out: |
| 275 | return; |
| 276 | } |
| 277 | |
| 278 | static void bonding_candidate_add(struct orig_node *orig_node, |
| 279 | struct neigh_node *neigh_node) |
| 280 | { |
| 281 | struct hlist_node *node; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 282 | struct neigh_node *tmp_neigh_node, *router = NULL; |
| 283 | uint8_t interference_candidate = 0; |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 284 | |
| 285 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 286 | |
| 287 | /* only consider if it has the same primary address ... */ |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 288 | if (!compare_eth(orig_node->orig, |
| 289 | neigh_node->orig_node->primary_addr)) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 290 | goto candidate_del; |
| 291 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 292 | router = orig_node_get_router(orig_node); |
| 293 | if (!router) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 294 | goto candidate_del; |
| 295 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 296 | /* ... and is good enough to be considered */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 297 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 298 | goto candidate_del; |
| 299 | |
| 300 | /** |
| 301 | * check if we have another candidate with the same mac address or |
| 302 | * interface. If we do, we won't select this candidate because of |
| 303 | * possible interference. |
| 304 | */ |
| 305 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 306 | &orig_node->neigh_list, list) { |
| 307 | |
| 308 | if (tmp_neigh_node == neigh_node) |
| 309 | continue; |
| 310 | |
| 311 | /* we only care if the other candidate is even |
| 312 | * considered as candidate. */ |
| 313 | if (list_empty(&tmp_neigh_node->bonding_list)) |
| 314 | continue; |
| 315 | |
| 316 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 317 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 318 | interference_candidate = 1; |
| 319 | break; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* don't care further if it is an interference candidate */ |
| 324 | if (interference_candidate) |
| 325 | goto candidate_del; |
| 326 | |
| 327 | /* this neighbor already is part of our candidate list */ |
| 328 | if (!list_empty(&neigh_node->bonding_list)) |
| 329 | goto out; |
| 330 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 331 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
| 332 | goto out; |
| 333 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 334 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 335 | atomic_inc(&orig_node->bond_candidates); |
| 336 | goto out; |
| 337 | |
| 338 | candidate_del: |
| 339 | bonding_candidate_del(orig_node, neigh_node); |
| 340 | |
| 341 | out: |
| 342 | spin_unlock_bh(&orig_node->neigh_list_lock); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 343 | |
| 344 | if (router) |
| 345 | neigh_node_free_ref(router); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* copy primary address for bonding */ |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 349 | static void bonding_save_primary(const struct orig_node *orig_node, |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 350 | struct orig_node *orig_neigh_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 351 | const struct batman_packet *batman_packet) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 352 | { |
| 353 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) |
| 354 | return; |
| 355 | |
| 356 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); |
| 357 | } |
| 358 | |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 359 | static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, |
| 360 | const struct ethhdr *ethhdr, |
| 361 | const struct batman_packet *batman_packet, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 362 | struct hard_iface *if_incoming, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 363 | const unsigned char *tt_buff, int tt_buff_len, |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 364 | char is_duplicate) |
| 365 | { |
| 366 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 367 | struct neigh_node *router = NULL; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 368 | struct orig_node *orig_node_tmp; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 369 | struct hlist_node *node; |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 370 | int tmp_tt_buff_len; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 371 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 372 | |
| 373 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " |
| 374 | "Searching and updating originator entry of received packet\n"); |
| 375 | |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 376 | rcu_read_lock(); |
| 377 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 378 | &orig_node->neigh_list, list) { |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 379 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 380 | (tmp_neigh_node->if_incoming == if_incoming) && |
| 381 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { |
| 382 | if (neigh_node) |
| 383 | neigh_node_free_ref(neigh_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 384 | neigh_node = tmp_neigh_node; |
| 385 | continue; |
| 386 | } |
| 387 | |
| 388 | if (is_duplicate) |
| 389 | continue; |
| 390 | |
Linus Lüssing | 6800390 | 2011-03-14 22:43:40 +0000 | [diff] [blame] | 391 | spin_lock_bh(&tmp_neigh_node->tq_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 392 | ring_buffer_set(tmp_neigh_node->tq_recv, |
| 393 | &tmp_neigh_node->tq_index, 0); |
| 394 | tmp_neigh_node->tq_avg = |
| 395 | ring_buffer_avg(tmp_neigh_node->tq_recv); |
Linus Lüssing | 6800390 | 2011-03-14 22:43:40 +0000 | [diff] [blame] | 396 | spin_unlock_bh(&tmp_neigh_node->tq_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | if (!neigh_node) { |
| 400 | struct orig_node *orig_tmp; |
| 401 | |
| 402 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); |
| 403 | if (!orig_tmp) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 404 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 405 | |
| 406 | neigh_node = create_neighbor(orig_node, orig_tmp, |
| 407 | ethhdr->h_source, if_incoming); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 408 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 409 | orig_node_free_ref(orig_tmp); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 410 | if (!neigh_node) |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 411 | goto unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 412 | } else |
| 413 | bat_dbg(DBG_BATMAN, bat_priv, |
| 414 | "Updating existing last-hop neighbor of originator\n"); |
| 415 | |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 416 | rcu_read_unlock(); |
| 417 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 418 | orig_node->flags = batman_packet->flags; |
| 419 | neigh_node->last_valid = jiffies; |
| 420 | |
Linus Lüssing | 6800390 | 2011-03-14 22:43:40 +0000 | [diff] [blame] | 421 | spin_lock_bh(&neigh_node->tq_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 422 | ring_buffer_set(neigh_node->tq_recv, |
| 423 | &neigh_node->tq_index, |
| 424 | batman_packet->tq); |
| 425 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); |
Linus Lüssing | 6800390 | 2011-03-14 22:43:40 +0000 | [diff] [blame] | 426 | spin_unlock_bh(&neigh_node->tq_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 427 | |
| 428 | if (!is_duplicate) { |
| 429 | orig_node->last_ttl = batman_packet->ttl; |
| 430 | neigh_node->last_ttl = batman_packet->ttl; |
| 431 | } |
| 432 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 433 | bonding_candidate_add(orig_node, neigh_node); |
| 434 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 435 | tmp_tt_buff_len = (tt_buff_len > batman_packet->num_tt * ETH_ALEN ? |
| 436 | batman_packet->num_tt * ETH_ALEN : tt_buff_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 437 | |
| 438 | /* if this neighbor already is our next hop there is nothing |
| 439 | * to change */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 440 | router = orig_node_get_router(orig_node); |
| 441 | if (router == neigh_node) |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 442 | goto update_tt; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 443 | |
| 444 | /* if this neighbor does not offer a better TQ we won't consider it */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 445 | if (router && (router->tq_avg > neigh_node->tq_avg)) |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 446 | goto update_tt; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 447 | |
| 448 | /* if the TQ is the same and the link not more symetric we |
| 449 | * won't consider it either */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 450 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
| 451 | orig_node_tmp = router->orig_node; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 452 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 453 | bcast_own_sum_orig = |
| 454 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
| 455 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 456 | |
| 457 | orig_node_tmp = neigh_node->orig_node; |
| 458 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 459 | bcast_own_sum_neigh = |
| 460 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; |
| 461 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| 462 | |
| 463 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 464 | goto update_tt; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 465 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 466 | |
| 467 | update_routes(bat_priv, orig_node, neigh_node, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 468 | tt_buff, tmp_tt_buff_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 469 | goto update_gw; |
| 470 | |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 471 | update_tt: |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 472 | update_routes(bat_priv, orig_node, router, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 473 | tt_buff, tmp_tt_buff_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 474 | |
| 475 | update_gw: |
| 476 | if (orig_node->gw_flags != batman_packet->gw_flags) |
| 477 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); |
| 478 | |
| 479 | orig_node->gw_flags = batman_packet->gw_flags; |
| 480 | |
| 481 | /* restart gateway selection if fast or late switching was enabled */ |
| 482 | if ((orig_node->gw_flags) && |
| 483 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && |
| 484 | (atomic_read(&bat_priv->gw_sel_class) > 2)) |
| 485 | gw_check_election(bat_priv, orig_node); |
Marek Lindner | a775eb8 | 2011-01-19 20:01:39 +0000 | [diff] [blame] | 486 | |
| 487 | goto out; |
| 488 | |
| 489 | unlock: |
| 490 | rcu_read_unlock(); |
| 491 | out: |
| 492 | if (neigh_node) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 493 | neigh_node_free_ref(neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 494 | if (router) |
| 495 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | /* checks whether the host restarted and is in the protection time. |
| 499 | * returns: |
| 500 | * 0 if the packet is to be accepted |
| 501 | * 1 if the packet is to be ignored. |
| 502 | */ |
| 503 | static int window_protected(struct bat_priv *bat_priv, |
| 504 | int32_t seq_num_diff, |
| 505 | unsigned long *last_reset) |
| 506 | { |
| 507 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) |
| 508 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { |
| 509 | if (time_after(jiffies, *last_reset + |
| 510 | msecs_to_jiffies(RESET_PROTECTION_MS))) { |
| 511 | |
| 512 | *last_reset = jiffies; |
| 513 | bat_dbg(DBG_BATMAN, bat_priv, |
| 514 | "old packet received, start protection\n"); |
| 515 | |
| 516 | return 0; |
| 517 | } else |
| 518 | return 1; |
| 519 | } |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | /* processes a batman packet for all interfaces, adjusts the sequence number and |
| 524 | * finds out whether it is a duplicate. |
| 525 | * returns: |
| 526 | * 1 the packet is a duplicate |
| 527 | * 0 the packet has not yet been received |
| 528 | * -1 the packet is old and has been received while the seqno window |
| 529 | * was protected. Caller should drop it. |
| 530 | */ |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 531 | static char count_real_packets(const struct ethhdr *ethhdr, |
| 532 | const struct batman_packet *batman_packet, |
| 533 | const struct hard_iface *if_incoming) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 534 | { |
| 535 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| 536 | struct orig_node *orig_node; |
| 537 | struct neigh_node *tmp_neigh_node; |
Marek Lindner | 9591a79 | 2010-12-12 21:57:11 +0000 | [diff] [blame] | 538 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 539 | char is_duplicate = 0; |
| 540 | int32_t seq_diff; |
| 541 | int need_update = 0; |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 542 | int set_mark, ret = -1; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 543 | |
| 544 | orig_node = get_orig_node(bat_priv, batman_packet->orig); |
| 545 | if (!orig_node) |
| 546 | return 0; |
| 547 | |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 548 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 549 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
| 550 | |
| 551 | /* signalize caller that the packet is to be dropped. */ |
| 552 | if (window_protected(bat_priv, seq_diff, |
| 553 | &orig_node->batman_seqno_reset)) |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 554 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 555 | |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 556 | rcu_read_lock(); |
| 557 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 558 | &orig_node->neigh_list, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 559 | |
| 560 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, |
| 561 | orig_node->last_real_seqno, |
| 562 | batman_packet->seqno); |
| 563 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 564 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 565 | (tmp_neigh_node->if_incoming == if_incoming)) |
| 566 | set_mark = 1; |
| 567 | else |
| 568 | set_mark = 0; |
| 569 | |
| 570 | /* if the window moved, set the update flag. */ |
| 571 | need_update |= bit_get_packet(bat_priv, |
| 572 | tmp_neigh_node->real_bits, |
| 573 | seq_diff, set_mark); |
| 574 | |
| 575 | tmp_neigh_node->real_packet_count = |
| 576 | bit_packet_count(tmp_neigh_node->real_bits); |
| 577 | } |
Marek Lindner | f987ed6 | 2010-12-12 21:57:12 +0000 | [diff] [blame] | 578 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 579 | |
| 580 | if (need_update) { |
| 581 | bat_dbg(DBG_BATMAN, bat_priv, |
| 582 | "updating last_seqno: old %d, new %d\n", |
| 583 | orig_node->last_real_seqno, batman_packet->seqno); |
| 584 | orig_node->last_real_seqno = batman_packet->seqno; |
| 585 | } |
| 586 | |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 587 | ret = is_duplicate; |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 588 | |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 589 | out: |
| 590 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 591 | orig_node_free_ref(orig_node); |
Marek Lindner | 0ede9f4 | 2011-01-25 21:52:10 +0000 | [diff] [blame] | 592 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 593 | } |
| 594 | |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 595 | void receive_bat_packet(const struct ethhdr *ethhdr, |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 596 | struct batman_packet *batman_packet, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 597 | const unsigned char *tt_buff, int tt_buff_len, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 598 | struct hard_iface *if_incoming) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 599 | { |
| 600 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 601 | struct hard_iface *hard_iface; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 602 | struct orig_node *orig_neigh_node, *orig_node; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 603 | struct neigh_node *router = NULL, *router_router = NULL; |
| 604 | struct neigh_node *orig_neigh_router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 605 | char has_directlink_flag; |
| 606 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; |
| 607 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; |
| 608 | char is_duplicate; |
| 609 | uint32_t if_incoming_seqno; |
| 610 | |
| 611 | /* Silently drop when the batman packet is actually not a |
| 612 | * correct packet. |
| 613 | * |
| 614 | * This might happen if a packet is padded (e.g. Ethernet has a |
| 615 | * minimum frame length of 64 byte) and the aggregation interprets |
| 616 | * it as an additional length. |
| 617 | * |
| 618 | * TODO: A more sane solution would be to have a bit in the |
| 619 | * batman_packet to detect whether the packet is the last |
| 620 | * packet in an aggregation. Here we expect that the padding |
| 621 | * is always zero (or not 0x01) |
| 622 | */ |
| 623 | if (batman_packet->packet_type != BAT_PACKET) |
| 624 | return; |
| 625 | |
| 626 | /* could be changed by schedule_own_packet() */ |
| 627 | if_incoming_seqno = atomic_read(&if_incoming->seqno); |
| 628 | |
| 629 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
| 630 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 631 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
| 632 | batman_packet->orig) ? 1 : 0); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 633 | |
| 634 | bat_dbg(DBG_BATMAN, bat_priv, |
| 635 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " |
| 636 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " |
| 637 | "TTL %d, V %d, IDF %d)\n", |
| 638 | ethhdr->h_source, if_incoming->net_dev->name, |
| 639 | if_incoming->net_dev->dev_addr, batman_packet->orig, |
| 640 | batman_packet->prev_sender, batman_packet->seqno, |
| 641 | batman_packet->tq, batman_packet->ttl, batman_packet->version, |
| 642 | has_directlink_flag); |
| 643 | |
| 644 | rcu_read_lock(); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 645 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
| 646 | if (hard_iface->if_status != IF_ACTIVE) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 647 | continue; |
| 648 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 649 | if (hard_iface->soft_iface != if_incoming->soft_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 650 | continue; |
| 651 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 652 | if (compare_eth(ethhdr->h_source, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 653 | hard_iface->net_dev->dev_addr)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 654 | is_my_addr = 1; |
| 655 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 656 | if (compare_eth(batman_packet->orig, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 657 | hard_iface->net_dev->dev_addr)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 658 | is_my_orig = 1; |
| 659 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 660 | if (compare_eth(batman_packet->prev_sender, |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 661 | hard_iface->net_dev->dev_addr)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 662 | is_my_oldorig = 1; |
| 663 | |
Antonio Quartulli | 44e92bc | 2011-05-21 01:33:07 +0200 | [diff] [blame] | 664 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 665 | is_broadcast = 1; |
| 666 | } |
| 667 | rcu_read_unlock(); |
| 668 | |
| 669 | if (batman_packet->version != COMPAT_VERSION) { |
| 670 | bat_dbg(DBG_BATMAN, bat_priv, |
| 671 | "Drop packet: incompatible batman version (%i)\n", |
| 672 | batman_packet->version); |
| 673 | return; |
| 674 | } |
| 675 | |
| 676 | if (is_my_addr) { |
| 677 | bat_dbg(DBG_BATMAN, bat_priv, |
| 678 | "Drop packet: received my own broadcast (sender: %pM" |
| 679 | ")\n", |
| 680 | ethhdr->h_source); |
| 681 | return; |
| 682 | } |
| 683 | |
| 684 | if (is_broadcast) { |
| 685 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
| 686 | "ignoring all packets with broadcast source addr (sender: %pM" |
| 687 | ")\n", ethhdr->h_source); |
| 688 | return; |
| 689 | } |
| 690 | |
| 691 | if (is_my_orig) { |
| 692 | unsigned long *word; |
| 693 | int offset; |
| 694 | |
| 695 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 696 | if (!orig_neigh_node) |
| 697 | return; |
| 698 | |
| 699 | /* neighbor has to indicate direct link and it has to |
| 700 | * come via the corresponding interface */ |
| 701 | /* if received seqno equals last send seqno save new |
| 702 | * seqno for bidirectional check */ |
| 703 | if (has_directlink_flag && |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 704 | compare_eth(if_incoming->net_dev->dev_addr, |
| 705 | batman_packet->orig) && |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 706 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
| 707 | offset = if_incoming->if_num * NUM_WORDS; |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 708 | |
| 709 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 710 | word = &(orig_neigh_node->bcast_own[offset]); |
| 711 | bit_mark(word, 0); |
| 712 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = |
| 713 | bit_packet_count(word); |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 714 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
| 718 | "originator packet from myself (via neighbor)\n"); |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 719 | orig_node_free_ref(orig_neigh_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 720 | return; |
| 721 | } |
| 722 | |
| 723 | if (is_my_oldorig) { |
| 724 | bat_dbg(DBG_BATMAN, bat_priv, |
| 725 | "Drop packet: ignoring all rebroadcast echos (sender: " |
| 726 | "%pM)\n", ethhdr->h_source); |
| 727 | return; |
| 728 | } |
| 729 | |
| 730 | orig_node = get_orig_node(bat_priv, batman_packet->orig); |
| 731 | if (!orig_node) |
| 732 | return; |
| 733 | |
| 734 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); |
| 735 | |
| 736 | if (is_duplicate == -1) { |
| 737 | bat_dbg(DBG_BATMAN, bat_priv, |
| 738 | "Drop packet: packet within seqno protection time " |
| 739 | "(sender: %pM)\n", ethhdr->h_source); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 740 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | if (batman_packet->tq == 0) { |
| 744 | bat_dbg(DBG_BATMAN, bat_priv, |
| 745 | "Drop packet: originator packet with tq equal 0\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 746 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 747 | } |
| 748 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 749 | router = orig_node_get_router(orig_node); |
| 750 | if (router) |
| 751 | router_router = orig_node_get_router(router->orig_node); |
| 752 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 753 | /* avoid temporary routing loops */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 754 | if (router && router_router && |
| 755 | (compare_eth(router->addr, batman_packet->prev_sender)) && |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 756 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 757 | (compare_eth(router->addr, router_router->addr))) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 758 | bat_dbg(DBG_BATMAN, bat_priv, |
| 759 | "Drop packet: ignoring all rebroadcast packets that " |
| 760 | "may make me loop (sender: %pM)\n", ethhdr->h_source); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 761 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /* if sender is a direct neighbor the sender mac equals |
| 765 | * originator mac */ |
| 766 | orig_neigh_node = (is_single_hop_neigh ? |
| 767 | orig_node : |
| 768 | get_orig_node(bat_priv, ethhdr->h_source)); |
| 769 | if (!orig_neigh_node) |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 770 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 771 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 772 | orig_neigh_router = orig_node_get_router(orig_neigh_node); |
| 773 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 774 | /* drop packet if sender is not a direct neighbor and if we |
| 775 | * don't route towards it */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 776 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 777 | bat_dbg(DBG_BATMAN, bat_priv, |
| 778 | "Drop packet: OGM via unknown neighbor!\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 779 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, |
| 783 | batman_packet, if_incoming); |
| 784 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 785 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
| 786 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 787 | /* update ranking if it is not a duplicate or has the same |
| 788 | * seqno and similar ttl as the non-duplicate */ |
| 789 | if (is_bidirectional && |
| 790 | (!is_duplicate || |
| 791 | ((orig_node->last_real_seqno == batman_packet->seqno) && |
| 792 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) |
| 793 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 794 | if_incoming, tt_buff, tt_buff_len, is_duplicate); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 795 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 796 | /* is single hop (direct) neighbor */ |
| 797 | if (is_single_hop_neigh) { |
| 798 | |
| 799 | /* mark direct link on incoming interface */ |
| 800 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 801 | 1, tt_buff_len, if_incoming); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 802 | |
| 803 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " |
| 804 | "rebroadcast neighbor packet with direct link flag\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 805 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* multihop originator */ |
| 809 | if (!is_bidirectional) { |
| 810 | bat_dbg(DBG_BATMAN, bat_priv, |
| 811 | "Drop packet: not received via bidirectional link\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 812 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | if (is_duplicate) { |
| 816 | bat_dbg(DBG_BATMAN, bat_priv, |
| 817 | "Drop packet: duplicate packet received\n"); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 818 | goto out_neigh; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 819 | } |
| 820 | |
| 821 | bat_dbg(DBG_BATMAN, bat_priv, |
| 822 | "Forwarding packet: rebroadcast originator packet\n"); |
| 823 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 824 | 0, tt_buff_len, if_incoming); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 825 | |
| 826 | out_neigh: |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 827 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
| 828 | orig_node_free_ref(orig_neigh_node); |
Marek Lindner | 16b1aba | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 829 | out: |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 830 | if (router) |
| 831 | neigh_node_free_ref(router); |
| 832 | if (router_router) |
| 833 | neigh_node_free_ref(router_router); |
| 834 | if (orig_neigh_router) |
| 835 | neigh_node_free_ref(orig_neigh_router); |
| 836 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 837 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 838 | } |
| 839 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 840 | int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 841 | { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 842 | struct ethhdr *ethhdr; |
| 843 | |
| 844 | /* drop packet if it has not necessary minimum size */ |
| 845 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) |
| 846 | return NET_RX_DROP; |
| 847 | |
| 848 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 849 | |
| 850 | /* packet with broadcast indication but unicast recipient */ |
| 851 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
| 852 | return NET_RX_DROP; |
| 853 | |
| 854 | /* packet with broadcast sender address */ |
| 855 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 856 | return NET_RX_DROP; |
| 857 | |
| 858 | /* create a copy of the skb, if needed, to modify it. */ |
| 859 | if (skb_cow(skb, 0) < 0) |
| 860 | return NET_RX_DROP; |
| 861 | |
| 862 | /* keep skb linear */ |
| 863 | if (skb_linearize(skb) < 0) |
| 864 | return NET_RX_DROP; |
| 865 | |
| 866 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 867 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 868 | receive_aggr_bat_packet(ethhdr, |
| 869 | skb->data, |
| 870 | skb_headlen(skb), |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 871 | hard_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 872 | |
| 873 | kfree_skb(skb); |
| 874 | return NET_RX_SUCCESS; |
| 875 | } |
| 876 | |
| 877 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, |
| 878 | struct sk_buff *skb, size_t icmp_len) |
| 879 | { |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 880 | struct hard_iface *primary_if = NULL; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 881 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 882 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 883 | struct icmp_packet_rr *icmp_packet; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 884 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 885 | |
| 886 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 887 | |
| 888 | /* add data to device queue */ |
| 889 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 890 | bat_socket_receive_packet(icmp_packet, icmp_len); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 891 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 892 | } |
| 893 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 894 | primary_if = primary_if_get_selected(bat_priv); |
| 895 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 896 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 897 | |
| 898 | /* answer echo request (ping) */ |
| 899 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 900 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 901 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 902 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 903 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 904 | router = orig_node_get_router(orig_node); |
| 905 | if (!router) |
| 906 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 907 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 908 | /* create a copy of the skb, if needed, to modify it. */ |
| 909 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 910 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 911 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 912 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 913 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 914 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 915 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 916 | icmp_packet->msg_type = ECHO_REPLY; |
| 917 | icmp_packet->ttl = TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 918 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 919 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 920 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 921 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 922 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 923 | if (primary_if) |
| 924 | hardif_free_ref(primary_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 925 | if (router) |
| 926 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 927 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 928 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 929 | return ret; |
| 930 | } |
| 931 | |
| 932 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 933 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 934 | { |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 935 | struct hard_iface *primary_if = NULL; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 936 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 937 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 938 | struct icmp_packet *icmp_packet; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 939 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 940 | |
| 941 | icmp_packet = (struct icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 942 | |
| 943 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
| 944 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 945 | pr_debug("Warning - can't forward icmp packet from %pM to " |
| 946 | "%pM: ttl exceeded\n", icmp_packet->orig, |
| 947 | icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 948 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 949 | } |
| 950 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 951 | primary_if = primary_if_get_selected(bat_priv); |
| 952 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 953 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 954 | |
| 955 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 956 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 957 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 958 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 959 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 960 | router = orig_node_get_router(orig_node); |
| 961 | if (!router) |
| 962 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 963 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 964 | /* create a copy of the skb, if needed, to modify it. */ |
| 965 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 966 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 967 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 968 | icmp_packet = (struct icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 969 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 970 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 971 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 972 | icmp_packet->msg_type = TTL_EXCEEDED; |
| 973 | icmp_packet->ttl = TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 974 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 975 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 976 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 977 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 978 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 979 | if (primary_if) |
| 980 | hardif_free_ref(primary_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 981 | if (router) |
| 982 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 983 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 984 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 989 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 990 | { |
| 991 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 992 | struct icmp_packet_rr *icmp_packet; |
| 993 | struct ethhdr *ethhdr; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 994 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 995 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 996 | int hdr_size = sizeof(struct icmp_packet); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 997 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 998 | |
| 999 | /** |
| 1000 | * we truncate all incoming icmp packets if they don't match our size |
| 1001 | */ |
| 1002 | if (skb->len >= sizeof(struct icmp_packet_rr)) |
| 1003 | hdr_size = sizeof(struct icmp_packet_rr); |
| 1004 | |
| 1005 | /* drop packet if it has not necessary minimum size */ |
| 1006 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1007 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1008 | |
| 1009 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1010 | |
| 1011 | /* packet with unicast indication but broadcast recipient */ |
| 1012 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1013 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1014 | |
| 1015 | /* packet with broadcast sender address */ |
| 1016 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1017 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1018 | |
| 1019 | /* not for me */ |
| 1020 | if (!is_my_mac(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1021 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1022 | |
| 1023 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
| 1024 | |
| 1025 | /* add record route information if not full */ |
| 1026 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && |
| 1027 | (icmp_packet->rr_cur < BAT_RR_LEN)) { |
| 1028 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
| 1029 | ethhdr->h_dest, ETH_ALEN); |
| 1030 | icmp_packet->rr_cur++; |
| 1031 | } |
| 1032 | |
| 1033 | /* packet for me */ |
| 1034 | if (is_my_mac(icmp_packet->dst)) |
| 1035 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); |
| 1036 | |
| 1037 | /* TTL exceeded */ |
| 1038 | if (icmp_packet->ttl < 2) |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 1039 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1040 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1041 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1042 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1043 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1044 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1045 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1046 | router = orig_node_get_router(orig_node); |
| 1047 | if (!router) |
| 1048 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1049 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1050 | /* create a copy of the skb, if needed, to modify it. */ |
| 1051 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 1052 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1053 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1054 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1055 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1056 | /* decrement ttl */ |
| 1057 | icmp_packet->ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1058 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1059 | /* route it */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1060 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1061 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1062 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1063 | out: |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1064 | if (router) |
| 1065 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1066 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 1067 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1068 | return ret; |
| 1069 | } |
| 1070 | |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 1071 | /* In the bonding case, send the packets in a round |
| 1072 | * robin fashion over the remaining interfaces. |
| 1073 | * |
| 1074 | * This method rotates the bonding list and increases the |
| 1075 | * returned router's refcount. */ |
| 1076 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 1077 | const struct hard_iface *recv_if) |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 1078 | { |
| 1079 | struct neigh_node *tmp_neigh_node; |
| 1080 | struct neigh_node *router = NULL, *first_candidate = NULL; |
| 1081 | |
| 1082 | rcu_read_lock(); |
| 1083 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, |
| 1084 | bonding_list) { |
| 1085 | if (!first_candidate) |
| 1086 | first_candidate = tmp_neigh_node; |
| 1087 | |
| 1088 | /* recv_if == NULL on the first node. */ |
| 1089 | if (tmp_neigh_node->if_incoming == recv_if) |
| 1090 | continue; |
| 1091 | |
| 1092 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| 1093 | continue; |
| 1094 | |
| 1095 | router = tmp_neigh_node; |
| 1096 | break; |
| 1097 | } |
| 1098 | |
| 1099 | /* use the first candidate if nothing was found. */ |
| 1100 | if (!router && first_candidate && |
| 1101 | atomic_inc_not_zero(&first_candidate->refcount)) |
| 1102 | router = first_candidate; |
| 1103 | |
| 1104 | if (!router) |
| 1105 | goto out; |
| 1106 | |
| 1107 | /* selected should point to the next element |
| 1108 | * after the current router */ |
| 1109 | spin_lock_bh(&primary_orig->neigh_list_lock); |
| 1110 | /* this is a list_move(), which unfortunately |
| 1111 | * does not exist as rcu version */ |
| 1112 | list_del_rcu(&primary_orig->bond_list); |
| 1113 | list_add_rcu(&primary_orig->bond_list, |
| 1114 | &router->bonding_list); |
| 1115 | spin_unlock_bh(&primary_orig->neigh_list_lock); |
| 1116 | |
| 1117 | out: |
| 1118 | rcu_read_unlock(); |
| 1119 | return router; |
| 1120 | } |
| 1121 | |
| 1122 | /* Interface Alternating: Use the best of the |
| 1123 | * remaining candidates which are not using |
| 1124 | * this interface. |
| 1125 | * |
| 1126 | * Increases the returned router's refcount */ |
| 1127 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 1128 | const struct hard_iface *recv_if) |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 1129 | { |
| 1130 | struct neigh_node *tmp_neigh_node; |
| 1131 | struct neigh_node *router = NULL, *first_candidate = NULL; |
| 1132 | |
| 1133 | rcu_read_lock(); |
| 1134 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, |
| 1135 | bonding_list) { |
| 1136 | if (!first_candidate) |
| 1137 | first_candidate = tmp_neigh_node; |
| 1138 | |
| 1139 | /* recv_if == NULL on the first node. */ |
| 1140 | if (tmp_neigh_node->if_incoming == recv_if) |
| 1141 | continue; |
| 1142 | |
| 1143 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| 1144 | continue; |
| 1145 | |
| 1146 | /* if we don't have a router yet |
| 1147 | * or this one is better, choose it. */ |
| 1148 | if ((!router) || |
| 1149 | (tmp_neigh_node->tq_avg > router->tq_avg)) { |
| 1150 | /* decrement refcount of |
| 1151 | * previously selected router */ |
| 1152 | if (router) |
| 1153 | neigh_node_free_ref(router); |
| 1154 | |
| 1155 | router = tmp_neigh_node; |
| 1156 | atomic_inc_not_zero(&router->refcount); |
| 1157 | } |
| 1158 | |
| 1159 | neigh_node_free_ref(tmp_neigh_node); |
| 1160 | } |
| 1161 | |
| 1162 | /* use the first candidate if nothing was found. */ |
| 1163 | if (!router && first_candidate && |
| 1164 | atomic_inc_not_zero(&first_candidate->refcount)) |
| 1165 | router = first_candidate; |
| 1166 | |
| 1167 | rcu_read_unlock(); |
| 1168 | return router; |
| 1169 | } |
| 1170 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1171 | /* find a suitable router for this originator, and use |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1172 | * bonding if possible. increases the found neighbors |
| 1173 | * refcount.*/ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1174 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
| 1175 | struct orig_node *orig_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 1176 | const struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1177 | { |
| 1178 | struct orig_node *primary_orig_node; |
| 1179 | struct orig_node *router_orig; |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 1180 | struct neigh_node *router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1181 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
| 1182 | int bonding_enabled; |
| 1183 | |
| 1184 | if (!orig_node) |
| 1185 | return NULL; |
| 1186 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1187 | router = orig_node_get_router(orig_node); |
| 1188 | if (!router) |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 1189 | goto err; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1190 | |
| 1191 | /* without bonding, the first node should |
| 1192 | * always choose the default router. */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1193 | bonding_enabled = atomic_read(&bat_priv->bonding); |
| 1194 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1195 | rcu_read_lock(); |
| 1196 | /* select default router to output */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 1197 | router_orig = router->orig_node; |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 1198 | if (!router_orig) |
| 1199 | goto err_unlock; |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1200 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1201 | if ((!recv_if) && (!bonding_enabled)) |
| 1202 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1203 | |
| 1204 | /* if we have something in the primary_addr, we can search |
| 1205 | * for a potential bonding candidate. */ |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 1206 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1207 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1208 | |
| 1209 | /* find the orig_node which has the primary interface. might |
| 1210 | * even be the same as our router_orig in many cases */ |
| 1211 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 1212 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1213 | primary_orig_node = router_orig; |
| 1214 | } else { |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1215 | primary_orig_node = orig_hash_find(bat_priv, |
| 1216 | router_orig->primary_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1217 | if (!primary_orig_node) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1218 | goto return_router; |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1219 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 1220 | orig_node_free_ref(primary_orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1221 | } |
| 1222 | |
| 1223 | /* with less than 2 candidates, we can't do any |
| 1224 | * bonding and prefer the original router. */ |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1225 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
| 1226 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1227 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1228 | /* all nodes between should choose a candidate which |
| 1229 | * is is not on the interface where the packet came |
| 1230 | * in. */ |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1231 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1232 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1233 | |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 1234 | if (bonding_enabled) |
| 1235 | router = find_bond_router(primary_orig_node, recv_if); |
| 1236 | else |
| 1237 | router = find_ifalter_router(primary_orig_node, recv_if); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1238 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1239 | return_router: |
Antonio Quartulli | e2cbc11 | 2011-05-08 20:52:57 +0200 | [diff] [blame] | 1240 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
| 1241 | goto err_unlock; |
| 1242 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1243 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1244 | return router; |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 1245 | err_unlock: |
| 1246 | rcu_read_unlock(); |
| 1247 | err: |
| 1248 | if (router) |
| 1249 | neigh_node_free_ref(router); |
| 1250 | return NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) |
| 1254 | { |
| 1255 | struct ethhdr *ethhdr; |
| 1256 | |
| 1257 | /* drop packet if it has not necessary minimum size */ |
| 1258 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1259 | return -1; |
| 1260 | |
| 1261 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1262 | |
| 1263 | /* packet with unicast indication but broadcast recipient */ |
| 1264 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 1265 | return -1; |
| 1266 | |
| 1267 | /* packet with broadcast sender address */ |
| 1268 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 1269 | return -1; |
| 1270 | |
| 1271 | /* not for me */ |
| 1272 | if (!is_my_mac(ethhdr->h_dest)) |
| 1273 | return -1; |
| 1274 | |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 1278 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1279 | { |
| 1280 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1281 | struct orig_node *orig_node = NULL; |
| 1282 | struct neigh_node *neigh_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1283 | struct unicast_packet *unicast_packet; |
| 1284 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1285 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1286 | struct sk_buff *new_skb; |
| 1287 | |
| 1288 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1289 | |
| 1290 | /* TTL exceeded */ |
| 1291 | if (unicast_packet->ttl < 2) { |
| 1292 | pr_debug("Warning - can't forward unicast packet from %pM to " |
| 1293 | "%pM: ttl exceeded\n", ethhdr->h_source, |
| 1294 | unicast_packet->dest); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1295 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1296 | } |
| 1297 | |
| 1298 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1299 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
| 1300 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1301 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 1302 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1303 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 1304 | /* find_router() increases neigh_nodes refcount if found. */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1305 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1306 | |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 1307 | if (!neigh_node) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1308 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1309 | |
| 1310 | /* create a copy of the skb, if needed, to modify it. */ |
| 1311 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1312 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1313 | |
| 1314 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1315 | |
| 1316 | if (unicast_packet->packet_type == BAT_UNICAST && |
| 1317 | atomic_read(&bat_priv->fragmentation) && |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 1318 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
| 1319 | ret = frag_send_skb(skb, bat_priv, |
| 1320 | neigh_node->if_incoming, neigh_node->addr); |
| 1321 | goto out; |
| 1322 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1323 | |
| 1324 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 1325 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1326 | |
| 1327 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 1328 | |
| 1329 | if (ret == NET_RX_DROP) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1330 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1331 | |
| 1332 | /* packet was buffered for late merge */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1333 | if (!new_skb) { |
| 1334 | ret = NET_RX_SUCCESS; |
| 1335 | goto out; |
| 1336 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1337 | |
| 1338 | skb = new_skb; |
| 1339 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1340 | } |
| 1341 | |
| 1342 | /* decrement ttl */ |
| 1343 | unicast_packet->ttl--; |
| 1344 | |
| 1345 | /* route it */ |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 1346 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1347 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1348 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1349 | out: |
| 1350 | if (neigh_node) |
| 1351 | neigh_node_free_ref(neigh_node); |
| 1352 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 1353 | orig_node_free_ref(orig_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 1354 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1355 | } |
| 1356 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1357 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1358 | { |
| 1359 | struct unicast_packet *unicast_packet; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1360 | int hdr_size = sizeof(*unicast_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1361 | |
| 1362 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 1363 | return NET_RX_DROP; |
| 1364 | |
| 1365 | unicast_packet = (struct unicast_packet *)skb->data; |
| 1366 | |
| 1367 | /* packet for me */ |
| 1368 | if (is_my_mac(unicast_packet->dest)) { |
| 1369 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
| 1370 | return NET_RX_SUCCESS; |
| 1371 | } |
| 1372 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 1373 | return route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1374 | } |
| 1375 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1376 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1377 | { |
| 1378 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1379 | struct unicast_frag_packet *unicast_packet; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1380 | int hdr_size = sizeof(*unicast_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1381 | struct sk_buff *new_skb = NULL; |
| 1382 | int ret; |
| 1383 | |
| 1384 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 1385 | return NET_RX_DROP; |
| 1386 | |
| 1387 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
| 1388 | |
| 1389 | /* packet for me */ |
| 1390 | if (is_my_mac(unicast_packet->dest)) { |
| 1391 | |
| 1392 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 1393 | |
| 1394 | if (ret == NET_RX_DROP) |
| 1395 | return NET_RX_DROP; |
| 1396 | |
| 1397 | /* packet was buffered for late merge */ |
| 1398 | if (!new_skb) |
| 1399 | return NET_RX_SUCCESS; |
| 1400 | |
| 1401 | interface_rx(recv_if->soft_iface, new_skb, recv_if, |
| 1402 | sizeof(struct unicast_packet)); |
| 1403 | return NET_RX_SUCCESS; |
| 1404 | } |
| 1405 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 1406 | return route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1407 | } |
| 1408 | |
| 1409 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1410 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1411 | { |
| 1412 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1413 | struct orig_node *orig_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1414 | struct bcast_packet *bcast_packet; |
| 1415 | struct ethhdr *ethhdr; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1416 | int hdr_size = sizeof(*bcast_packet); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1417 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1418 | int32_t seq_diff; |
| 1419 | |
| 1420 | /* drop packet if it has not necessary minimum size */ |
| 1421 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1422 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1423 | |
| 1424 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1425 | |
| 1426 | /* packet with broadcast indication but unicast recipient */ |
| 1427 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1428 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1429 | |
| 1430 | /* packet with broadcast sender address */ |
| 1431 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1432 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1433 | |
| 1434 | /* ignore broadcasts sent by myself */ |
| 1435 | if (is_my_mac(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1436 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1437 | |
| 1438 | bcast_packet = (struct bcast_packet *)skb->data; |
| 1439 | |
| 1440 | /* ignore broadcasts originated by myself */ |
| 1441 | if (is_my_mac(bcast_packet->orig)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1442 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1443 | |
| 1444 | if (bcast_packet->ttl < 2) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1445 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1446 | |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1447 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1448 | |
| 1449 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 1450 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1451 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1452 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1453 | |
| 1454 | /* check whether the packet is a duplicate */ |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1455 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
| 1456 | ntohl(bcast_packet->seqno))) |
| 1457 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1458 | |
| 1459 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; |
| 1460 | |
| 1461 | /* check whether the packet is old and the host just restarted. */ |
| 1462 | if (window_protected(bat_priv, seq_diff, |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1463 | &orig_node->bcast_seqno_reset)) |
| 1464 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1465 | |
| 1466 | /* mark broadcast in flood history, update window position |
| 1467 | * if required. */ |
| 1468 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
| 1469 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
| 1470 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1471 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1472 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1473 | /* rebroadcast packet */ |
| 1474 | add_bcast_packet_to_list(bat_priv, skb); |
| 1475 | |
| 1476 | /* broadcast for me */ |
| 1477 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1478 | ret = NET_RX_SUCCESS; |
| 1479 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1480 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1481 | spin_unlock: |
| 1482 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1483 | out: |
| 1484 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 1485 | orig_node_free_ref(orig_node); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1486 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1487 | } |
| 1488 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1489 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1490 | { |
| 1491 | struct vis_packet *vis_packet; |
| 1492 | struct ethhdr *ethhdr; |
| 1493 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1494 | int hdr_size = sizeof(*vis_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1495 | |
| 1496 | /* keep skb linear */ |
| 1497 | if (skb_linearize(skb) < 0) |
| 1498 | return NET_RX_DROP; |
| 1499 | |
| 1500 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1501 | return NET_RX_DROP; |
| 1502 | |
| 1503 | vis_packet = (struct vis_packet *)skb->data; |
| 1504 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1505 | |
| 1506 | /* not for me */ |
| 1507 | if (!is_my_mac(ethhdr->h_dest)) |
| 1508 | return NET_RX_DROP; |
| 1509 | |
| 1510 | /* ignore own packets */ |
| 1511 | if (is_my_mac(vis_packet->vis_orig)) |
| 1512 | return NET_RX_DROP; |
| 1513 | |
| 1514 | if (is_my_mac(vis_packet->sender_orig)) |
| 1515 | return NET_RX_DROP; |
| 1516 | |
| 1517 | switch (vis_packet->vis_type) { |
| 1518 | case VIS_TYPE_SERVER_SYNC: |
| 1519 | receive_server_sync_packet(bat_priv, vis_packet, |
| 1520 | skb_headlen(skb)); |
| 1521 | break; |
| 1522 | |
| 1523 | case VIS_TYPE_CLIENT_UPDATE: |
| 1524 | receive_client_update_packet(bat_priv, vis_packet, |
| 1525 | skb_headlen(skb)); |
| 1526 | break; |
| 1527 | |
| 1528 | default: /* ignore unknown packet */ |
| 1529 | break; |
| 1530 | } |
| 1531 | |
| 1532 | /* We take a copy of the data in the packet, so we should |
| 1533 | always free the skbuf. */ |
| 1534 | return NET_RX_DROP; |
| 1535 | } |