Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1 | /* |
Sven Eckelmann | 567db7b | 2012-01-01 00:41:38 +0100 | [diff] [blame] | 2 | * Copyright (C) 2007-2012 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" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 25 | #include "soft-interface.h" |
| 26 | #include "hard-interface.h" |
| 27 | #include "icmp_socket.h" |
| 28 | #include "translation-table.h" |
| 29 | #include "originator.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 30 | #include "vis.h" |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 31 | #include "unicast.h" |
| 32 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 33 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 34 | { |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 35 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 36 | struct hashtable_t *hash = bat_priv->orig_hash; |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 37 | struct hlist_node *node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 38 | struct hlist_head *head; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 39 | struct orig_node *orig_node; |
| 40 | unsigned long *word; |
Antonio Quartulli | c90681b | 2011-10-05 17:05:25 +0200 | [diff] [blame] | 41 | uint32_t i; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 42 | size_t word_index; |
| 43 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 44 | for (i = 0; i < hash->size; i++) { |
| 45 | head = &hash->table[i]; |
| 46 | |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 47 | rcu_read_lock(); |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 48 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 49 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 50 | word_index = hard_iface->if_num * NUM_WORDS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 51 | word = &(orig_node->bcast_own[word_index]); |
| 52 | |
| 53 | bit_get_packet(bat_priv, word, 1, 0); |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 54 | orig_node->bcast_own_sum[hard_iface->if_num] = |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 55 | bit_packet_count(word); |
Marek Lindner | 2ae2daf | 2011-01-19 20:01:42 +0000 | [diff] [blame] | 56 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 57 | } |
Marek Lindner | fb778ea | 2011-01-19 20:01:40 +0000 | [diff] [blame] | 58 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 59 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 62 | static void _update_route(struct bat_priv *bat_priv, |
| 63 | struct orig_node *orig_node, |
| 64 | struct neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 65 | { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 66 | struct neigh_node *curr_router; |
| 67 | |
| 68 | curr_router = orig_node_get_router(orig_node); |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 69 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 70 | /* route deleted */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 71 | if ((curr_router) && (!neigh_node)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 72 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
| 73 | orig_node->orig); |
Antonio Quartulli | 2dafb49 | 2011-05-05 08:42:45 +0200 | [diff] [blame] | 74 | tt_global_del_orig(bat_priv, orig_node, |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 75 | "Deleted route towards originator"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 76 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 77 | /* route added */ |
| 78 | } else if ((!curr_router) && (neigh_node)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 79 | |
| 80 | bat_dbg(DBG_ROUTES, bat_priv, |
| 81 | "Adding route towards: %pM (via %pM)\n", |
| 82 | orig_node->orig, neigh_node->addr); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 83 | /* route changed */ |
Sven Eckelmann | bb899b8 | 2011-05-10 11:22:37 +0200 | [diff] [blame] | 84 | } else if (neigh_node && curr_router) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 85 | bat_dbg(DBG_ROUTES, bat_priv, |
| 86 | "Changing route towards: %pM " |
| 87 | "(now via %pM - was via %pM)\n", |
| 88 | orig_node->orig, neigh_node->addr, |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 89 | curr_router->addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 90 | } |
| 91 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 92 | if (curr_router) |
| 93 | neigh_node_free_ref(curr_router); |
| 94 | |
| 95 | /* increase refcount of new best neighbor */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 96 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
| 97 | neigh_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 98 | |
| 99 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 100 | rcu_assign_pointer(orig_node->router, neigh_node); |
| 101 | spin_unlock_bh(&orig_node->neigh_list_lock); |
| 102 | |
| 103 | /* decrease refcount of previous best neighbor */ |
| 104 | if (curr_router) |
| 105 | neigh_node_free_ref(curr_router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 106 | } |
| 107 | |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 108 | void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
| 109 | struct neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 110 | { |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 111 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 112 | |
| 113 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 114 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 115 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 116 | router = orig_node_get_router(orig_node); |
| 117 | |
| 118 | if (router != neigh_node) |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 119 | _update_route(bat_priv, orig_node, neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 120 | |
| 121 | out: |
| 122 | if (router) |
| 123 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 124 | } |
| 125 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 126 | /* caller must hold the neigh_list_lock */ |
| 127 | void bonding_candidate_del(struct orig_node *orig_node, |
| 128 | struct neigh_node *neigh_node) |
| 129 | { |
| 130 | /* this neighbor is not part of our candidate list */ |
| 131 | if (list_empty(&neigh_node->bonding_list)) |
| 132 | goto out; |
| 133 | |
| 134 | list_del_rcu(&neigh_node->bonding_list); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 135 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 136 | neigh_node_free_ref(neigh_node); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 137 | atomic_dec(&orig_node->bond_candidates); |
| 138 | |
| 139 | out: |
| 140 | return; |
| 141 | } |
| 142 | |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 143 | void bonding_candidate_add(struct orig_node *orig_node, |
| 144 | struct neigh_node *neigh_node) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 145 | { |
| 146 | struct hlist_node *node; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 147 | struct neigh_node *tmp_neigh_node, *router = NULL; |
| 148 | uint8_t interference_candidate = 0; |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 149 | |
| 150 | spin_lock_bh(&orig_node->neigh_list_lock); |
| 151 | |
| 152 | /* only consider if it has the same primary address ... */ |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 153 | if (!compare_eth(orig_node->orig, |
| 154 | neigh_node->orig_node->primary_addr)) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 155 | goto candidate_del; |
| 156 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 157 | router = orig_node_get_router(orig_node); |
| 158 | if (!router) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 159 | goto candidate_del; |
| 160 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 161 | /* ... and is good enough to be considered */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 162 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 163 | goto candidate_del; |
| 164 | |
| 165 | /** |
| 166 | * check if we have another candidate with the same mac address or |
| 167 | * interface. If we do, we won't select this candidate because of |
| 168 | * possible interference. |
| 169 | */ |
| 170 | hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| 171 | &orig_node->neigh_list, list) { |
| 172 | |
| 173 | if (tmp_neigh_node == neigh_node) |
| 174 | continue; |
| 175 | |
| 176 | /* we only care if the other candidate is even |
| 177 | * considered as candidate. */ |
| 178 | if (list_empty(&tmp_neigh_node->bonding_list)) |
| 179 | continue; |
| 180 | |
| 181 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 182 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 183 | interference_candidate = 1; |
| 184 | break; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /* don't care further if it is an interference candidate */ |
| 189 | if (interference_candidate) |
| 190 | goto candidate_del; |
| 191 | |
| 192 | /* this neighbor already is part of our candidate list */ |
| 193 | if (!list_empty(&neigh_node->bonding_list)) |
| 194 | goto out; |
| 195 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 196 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
| 197 | goto out; |
| 198 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 199 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 200 | atomic_inc(&orig_node->bond_candidates); |
| 201 | goto out; |
| 202 | |
| 203 | candidate_del: |
| 204 | bonding_candidate_del(orig_node, neigh_node); |
| 205 | |
| 206 | out: |
| 207 | spin_unlock_bh(&orig_node->neigh_list_lock); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 208 | |
| 209 | if (router) |
| 210 | neigh_node_free_ref(router); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | /* copy primary address for bonding */ |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 214 | void bonding_save_primary(const struct orig_node *orig_node, |
| 215 | struct orig_node *orig_neigh_node, |
| 216 | const struct batman_ogm_packet *batman_ogm_packet) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 217 | { |
Marek Lindner | b6da4bf | 2011-07-29 17:31:50 +0200 | [diff] [blame] | 218 | if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 219 | return; |
| 220 | |
| 221 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); |
| 222 | } |
| 223 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 224 | /* checks whether the host restarted and is in the protection time. |
| 225 | * returns: |
| 226 | * 0 if the packet is to be accepted |
| 227 | * 1 if the packet is to be ignored. |
| 228 | */ |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 229 | int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
| 230 | unsigned long *last_reset) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 231 | { |
| 232 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) |
| 233 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { |
Marek Lindner | 032b796 | 2011-12-20 19:30:40 +0800 | [diff] [blame] | 234 | if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 235 | |
| 236 | *last_reset = jiffies; |
| 237 | bat_dbg(DBG_BATMAN, bat_priv, |
| 238 | "old packet received, start protection\n"); |
| 239 | |
| 240 | return 0; |
| 241 | } else |
| 242 | return 1; |
| 243 | } |
| 244 | return 0; |
| 245 | } |
| 246 | |
Marek Lindner | fc95727 | 2011-07-30 12:04:12 +0200 | [diff] [blame] | 247 | int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 248 | { |
Marek Lindner | 01c4224 | 2011-11-28 21:31:55 +0800 | [diff] [blame] | 249 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 250 | struct ethhdr *ethhdr; |
| 251 | |
| 252 | /* drop packet if it has not necessary minimum size */ |
Marek Lindner | b6da4bf | 2011-07-29 17:31:50 +0200 | [diff] [blame] | 253 | if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN))) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 254 | return NET_RX_DROP; |
| 255 | |
| 256 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 257 | |
| 258 | /* packet with broadcast indication but unicast recipient */ |
| 259 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
| 260 | return NET_RX_DROP; |
| 261 | |
| 262 | /* packet with broadcast sender address */ |
| 263 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 264 | return NET_RX_DROP; |
| 265 | |
| 266 | /* create a copy of the skb, if needed, to modify it. */ |
| 267 | if (skb_cow(skb, 0) < 0) |
| 268 | return NET_RX_DROP; |
| 269 | |
| 270 | /* keep skb linear */ |
| 271 | if (skb_linearize(skb) < 0) |
| 272 | return NET_RX_DROP; |
| 273 | |
Marek Lindner | 01c4224 | 2011-11-28 21:31:55 +0800 | [diff] [blame] | 274 | bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 275 | |
| 276 | kfree_skb(skb); |
| 277 | return NET_RX_SUCCESS; |
| 278 | } |
| 279 | |
| 280 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, |
| 281 | struct sk_buff *skb, size_t icmp_len) |
| 282 | { |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 283 | struct hard_iface *primary_if = NULL; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 284 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 285 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 286 | struct icmp_packet_rr *icmp_packet; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 287 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 288 | |
| 289 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 290 | |
| 291 | /* add data to device queue */ |
| 292 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 293 | bat_socket_receive_packet(icmp_packet, icmp_len); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 294 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 295 | } |
| 296 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 297 | primary_if = primary_if_get_selected(bat_priv); |
| 298 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 299 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 300 | |
| 301 | /* answer echo request (ping) */ |
| 302 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 303 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 304 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 305 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 306 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 307 | router = orig_node_get_router(orig_node); |
| 308 | if (!router) |
| 309 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 310 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 311 | /* create a copy of the skb, if needed, to modify it. */ |
| 312 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 313 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 314 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 315 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 316 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 317 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 318 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 319 | icmp_packet->msg_type = ECHO_REPLY; |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 320 | icmp_packet->header.ttl = TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 321 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 322 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 323 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 324 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 325 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 326 | if (primary_if) |
| 327 | hardif_free_ref(primary_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 328 | if (router) |
| 329 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 330 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 331 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 332 | return ret; |
| 333 | } |
| 334 | |
| 335 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 336 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 337 | { |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 338 | struct hard_iface *primary_if = NULL; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 339 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 340 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 341 | struct icmp_packet *icmp_packet; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 342 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 343 | |
| 344 | icmp_packet = (struct icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 345 | |
| 346 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
| 347 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
| 348 | pr_debug("Warning - can't forward icmp packet from %pM to " |
| 349 | "%pM: ttl exceeded\n", icmp_packet->orig, |
| 350 | icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 351 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 352 | } |
| 353 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 354 | primary_if = primary_if_get_selected(bat_priv); |
| 355 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 356 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 357 | |
| 358 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 359 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 360 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 361 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 362 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 363 | router = orig_node_get_router(orig_node); |
| 364 | if (!router) |
| 365 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 366 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 367 | /* create a copy of the skb, if needed, to modify it. */ |
| 368 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 369 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 370 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 371 | icmp_packet = (struct icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 372 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 373 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 374 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 375 | icmp_packet->msg_type = TTL_EXCEEDED; |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 376 | icmp_packet->header.ttl = TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 377 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 378 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 379 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 380 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 381 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 382 | if (primary_if) |
| 383 | hardif_free_ref(primary_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 384 | if (router) |
| 385 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 386 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 387 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 392 | 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] | 393 | { |
| 394 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 395 | struct icmp_packet_rr *icmp_packet; |
| 396 | struct ethhdr *ethhdr; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 397 | struct orig_node *orig_node = NULL; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 398 | struct neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 399 | int hdr_size = sizeof(struct icmp_packet); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 400 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 401 | |
| 402 | /** |
| 403 | * we truncate all incoming icmp packets if they don't match our size |
| 404 | */ |
| 405 | if (skb->len >= sizeof(struct icmp_packet_rr)) |
| 406 | hdr_size = sizeof(struct icmp_packet_rr); |
| 407 | |
| 408 | /* drop packet if it has not necessary minimum size */ |
| 409 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 410 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 411 | |
| 412 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 413 | |
| 414 | /* packet with unicast indication but broadcast recipient */ |
| 415 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 416 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 417 | |
| 418 | /* packet with broadcast sender address */ |
| 419 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 420 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 421 | |
| 422 | /* not for me */ |
| 423 | if (!is_my_mac(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 424 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 425 | |
| 426 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
| 427 | |
| 428 | /* add record route information if not full */ |
| 429 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && |
| 430 | (icmp_packet->rr_cur < BAT_RR_LEN)) { |
| 431 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
| 432 | ethhdr->h_dest, ETH_ALEN); |
| 433 | icmp_packet->rr_cur++; |
| 434 | } |
| 435 | |
| 436 | /* packet for me */ |
| 437 | if (is_my_mac(icmp_packet->dst)) |
| 438 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); |
| 439 | |
| 440 | /* TTL exceeded */ |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 441 | if (icmp_packet->header.ttl < 2) |
Simon Wunderlich | 74ef115 | 2010-12-29 16:15:19 +0000 | [diff] [blame] | 442 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 443 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 444 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 445 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 446 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 447 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 448 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 449 | router = orig_node_get_router(orig_node); |
| 450 | if (!router) |
| 451 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 452 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 453 | /* create a copy of the skb, if needed, to modify it. */ |
| 454 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
| 455 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 456 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 457 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 458 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 459 | /* decrement ttl */ |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 460 | icmp_packet->header.ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 461 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 462 | /* route it */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 463 | send_skb_packet(skb, router->if_incoming, router->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 464 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 465 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 466 | out: |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 467 | if (router) |
| 468 | neigh_node_free_ref(router); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 469 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 470 | orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 471 | return ret; |
| 472 | } |
| 473 | |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 474 | /* In the bonding case, send the packets in a round |
| 475 | * robin fashion over the remaining interfaces. |
| 476 | * |
| 477 | * This method rotates the bonding list and increases the |
| 478 | * returned router's refcount. */ |
| 479 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 480 | const struct hard_iface *recv_if) |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 481 | { |
| 482 | struct neigh_node *tmp_neigh_node; |
| 483 | struct neigh_node *router = NULL, *first_candidate = NULL; |
| 484 | |
| 485 | rcu_read_lock(); |
| 486 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, |
| 487 | bonding_list) { |
| 488 | if (!first_candidate) |
| 489 | first_candidate = tmp_neigh_node; |
| 490 | |
| 491 | /* recv_if == NULL on the first node. */ |
| 492 | if (tmp_neigh_node->if_incoming == recv_if) |
| 493 | continue; |
| 494 | |
| 495 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| 496 | continue; |
| 497 | |
| 498 | router = tmp_neigh_node; |
| 499 | break; |
| 500 | } |
| 501 | |
| 502 | /* use the first candidate if nothing was found. */ |
| 503 | if (!router && first_candidate && |
| 504 | atomic_inc_not_zero(&first_candidate->refcount)) |
| 505 | router = first_candidate; |
| 506 | |
| 507 | if (!router) |
| 508 | goto out; |
| 509 | |
| 510 | /* selected should point to the next element |
| 511 | * after the current router */ |
| 512 | spin_lock_bh(&primary_orig->neigh_list_lock); |
| 513 | /* this is a list_move(), which unfortunately |
| 514 | * does not exist as rcu version */ |
| 515 | list_del_rcu(&primary_orig->bond_list); |
| 516 | list_add_rcu(&primary_orig->bond_list, |
| 517 | &router->bonding_list); |
| 518 | spin_unlock_bh(&primary_orig->neigh_list_lock); |
| 519 | |
| 520 | out: |
| 521 | rcu_read_unlock(); |
| 522 | return router; |
| 523 | } |
| 524 | |
| 525 | /* Interface Alternating: Use the best of the |
| 526 | * remaining candidates which are not using |
| 527 | * this interface. |
| 528 | * |
| 529 | * Increases the returned router's refcount */ |
| 530 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 531 | const struct hard_iface *recv_if) |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 532 | { |
| 533 | struct neigh_node *tmp_neigh_node; |
| 534 | struct neigh_node *router = NULL, *first_candidate = NULL; |
| 535 | |
| 536 | rcu_read_lock(); |
| 537 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, |
| 538 | bonding_list) { |
| 539 | if (!first_candidate) |
| 540 | first_candidate = tmp_neigh_node; |
| 541 | |
| 542 | /* recv_if == NULL on the first node. */ |
| 543 | if (tmp_neigh_node->if_incoming == recv_if) |
| 544 | continue; |
| 545 | |
| 546 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| 547 | continue; |
| 548 | |
| 549 | /* if we don't have a router yet |
| 550 | * or this one is better, choose it. */ |
| 551 | if ((!router) || |
| 552 | (tmp_neigh_node->tq_avg > router->tq_avg)) { |
| 553 | /* decrement refcount of |
| 554 | * previously selected router */ |
| 555 | if (router) |
| 556 | neigh_node_free_ref(router); |
| 557 | |
| 558 | router = tmp_neigh_node; |
| 559 | atomic_inc_not_zero(&router->refcount); |
| 560 | } |
| 561 | |
| 562 | neigh_node_free_ref(tmp_neigh_node); |
| 563 | } |
| 564 | |
| 565 | /* use the first candidate if nothing was found. */ |
| 566 | if (!router && first_candidate && |
| 567 | atomic_inc_not_zero(&first_candidate->refcount)) |
| 568 | router = first_candidate; |
| 569 | |
| 570 | rcu_read_unlock(); |
| 571 | return router; |
| 572 | } |
| 573 | |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 574 | int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if) |
| 575 | { |
| 576 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 577 | struct tt_query_packet *tt_query; |
Antonio Quartulli | 8b7342d | 2011-10-16 20:32:03 +0200 | [diff] [blame] | 578 | uint16_t tt_len; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 579 | struct ethhdr *ethhdr; |
| 580 | |
| 581 | /* drop packet if it has not necessary minimum size */ |
| 582 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) |
| 583 | goto out; |
| 584 | |
| 585 | /* I could need to modify it */ |
| 586 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) |
| 587 | goto out; |
| 588 | |
| 589 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 590 | |
| 591 | /* packet with unicast indication but broadcast recipient */ |
| 592 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 593 | goto out; |
| 594 | |
| 595 | /* packet with broadcast sender address */ |
| 596 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 597 | goto out; |
| 598 | |
| 599 | tt_query = (struct tt_query_packet *)skb->data; |
| 600 | |
| 601 | tt_query->tt_data = ntohs(tt_query->tt_data); |
| 602 | |
| 603 | switch (tt_query->flags & TT_QUERY_TYPE_MASK) { |
| 604 | case TT_REQUEST: |
| 605 | /* If we cannot provide an answer the tt_request is |
| 606 | * forwarded */ |
| 607 | if (!send_tt_response(bat_priv, tt_query)) { |
| 608 | bat_dbg(DBG_TT, bat_priv, |
| 609 | "Routing TT_REQUEST to %pM [%c]\n", |
| 610 | tt_query->dst, |
| 611 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); |
| 612 | tt_query->tt_data = htons(tt_query->tt_data); |
| 613 | return route_unicast_packet(skb, recv_if); |
| 614 | } |
| 615 | break; |
| 616 | case TT_RESPONSE: |
Antonio Quartulli | dc58fe3 | 2011-10-16 20:32:02 +0200 | [diff] [blame] | 617 | if (is_my_mac(tt_query->dst)) { |
| 618 | /* packet needs to be linearized to access the TT |
| 619 | * changes */ |
| 620 | if (skb_linearize(skb) < 0) |
| 621 | goto out; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 622 | |
Antonio Quartulli | 8b7342d | 2011-10-16 20:32:03 +0200 | [diff] [blame] | 623 | tt_len = tt_query->tt_data * sizeof(struct tt_change); |
| 624 | |
| 625 | /* Ensure we have all the claimed data */ |
| 626 | if (unlikely(skb_headlen(skb) < |
Antonio Quartulli | 69497c1 | 2011-12-02 17:38:52 +0100 | [diff] [blame] | 627 | sizeof(struct tt_query_packet) + tt_len)) |
Antonio Quartulli | 8b7342d | 2011-10-16 20:32:03 +0200 | [diff] [blame] | 628 | goto out; |
| 629 | |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 630 | handle_tt_response(bat_priv, tt_query); |
Antonio Quartulli | dc58fe3 | 2011-10-16 20:32:02 +0200 | [diff] [blame] | 631 | } else { |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 632 | bat_dbg(DBG_TT, bat_priv, |
| 633 | "Routing TT_RESPONSE to %pM [%c]\n", |
| 634 | tt_query->dst, |
| 635 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); |
| 636 | tt_query->tt_data = htons(tt_query->tt_data); |
| 637 | return route_unicast_packet(skb, recv_if); |
| 638 | } |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | out: |
| 643 | /* returning NET_RX_DROP will make the caller function kfree the skb */ |
| 644 | return NET_RX_DROP; |
| 645 | } |
| 646 | |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 647 | int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
| 648 | { |
| 649 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 650 | struct roam_adv_packet *roam_adv_packet; |
| 651 | struct orig_node *orig_node; |
| 652 | struct ethhdr *ethhdr; |
| 653 | |
| 654 | /* drop packet if it has not necessary minimum size */ |
| 655 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) |
| 656 | goto out; |
| 657 | |
| 658 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 659 | |
| 660 | /* packet with unicast indication but broadcast recipient */ |
| 661 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 662 | goto out; |
| 663 | |
| 664 | /* packet with broadcast sender address */ |
| 665 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 666 | goto out; |
| 667 | |
| 668 | roam_adv_packet = (struct roam_adv_packet *)skb->data; |
| 669 | |
| 670 | if (!is_my_mac(roam_adv_packet->dst)) |
| 671 | return route_unicast_packet(skb, recv_if); |
| 672 | |
| 673 | orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); |
| 674 | if (!orig_node) |
| 675 | goto out; |
| 676 | |
| 677 | bat_dbg(DBG_TT, bat_priv, "Received ROAMING_ADV from %pM " |
| 678 | "(client %pM)\n", roam_adv_packet->src, |
| 679 | roam_adv_packet->client); |
| 680 | |
| 681 | tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
Antonio Quartulli | bc27908 | 2011-07-07 15:35:35 +0200 | [diff] [blame] | 682 | atomic_read(&orig_node->last_ttvn) + 1, true, false); |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 683 | |
| 684 | /* Roaming phase starts: I have new information but the ttvn has not |
| 685 | * been incremented yet. This flag will make me check all the incoming |
| 686 | * packets for the correct destination. */ |
| 687 | bat_priv->tt_poss_change = true; |
| 688 | |
| 689 | orig_node_free_ref(orig_node); |
| 690 | out: |
| 691 | /* returning NET_RX_DROP will make the caller function kfree the skb */ |
| 692 | return NET_RX_DROP; |
| 693 | } |
| 694 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 695 | /* find a suitable router for this originator, and use |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 696 | * bonding if possible. increases the found neighbors |
| 697 | * refcount.*/ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 698 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
| 699 | struct orig_node *orig_node, |
Sven Eckelmann | 747e422 | 2011-05-14 23:14:50 +0200 | [diff] [blame] | 700 | const struct hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 701 | { |
| 702 | struct orig_node *primary_orig_node; |
| 703 | struct orig_node *router_orig; |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 704 | struct neigh_node *router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 705 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
| 706 | int bonding_enabled; |
| 707 | |
| 708 | if (!orig_node) |
| 709 | return NULL; |
| 710 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 711 | router = orig_node_get_router(orig_node); |
| 712 | if (!router) |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 713 | goto err; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 714 | |
| 715 | /* without bonding, the first node should |
| 716 | * always choose the default router. */ |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 717 | bonding_enabled = atomic_read(&bat_priv->bonding); |
| 718 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 719 | rcu_read_lock(); |
| 720 | /* select default router to output */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 721 | router_orig = router->orig_node; |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 722 | if (!router_orig) |
| 723 | goto err_unlock; |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 724 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 725 | if ((!recv_if) && (!bonding_enabled)) |
| 726 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 727 | |
| 728 | /* if we have something in the primary_addr, we can search |
| 729 | * for a potential bonding candidate. */ |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 730 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 731 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 732 | |
| 733 | /* find the orig_node which has the primary interface. might |
| 734 | * even be the same as our router_orig in many cases */ |
| 735 | |
Marek Lindner | 39901e7 | 2011-02-18 12:28:08 +0000 | [diff] [blame] | 736 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 737 | primary_orig_node = router_orig; |
| 738 | } else { |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 739 | primary_orig_node = orig_hash_find(bat_priv, |
| 740 | router_orig->primary_addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 741 | if (!primary_orig_node) |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 742 | goto return_router; |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 743 | |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 744 | orig_node_free_ref(primary_orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | /* with less than 2 candidates, we can't do any |
| 748 | * bonding and prefer the original router. */ |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 749 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
| 750 | goto return_router; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 751 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 752 | /* all nodes between should choose a candidate which |
| 753 | * is is not on the interface where the packet came |
| 754 | * in. */ |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 755 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 756 | neigh_node_free_ref(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 757 | |
Linus Lüssing | 5515862 | 2011-03-14 22:43:27 +0000 | [diff] [blame] | 758 | if (bonding_enabled) |
| 759 | router = find_bond_router(primary_orig_node, recv_if); |
| 760 | else |
| 761 | router = find_ifalter_router(primary_orig_node, recv_if); |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 762 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 763 | return_router: |
Antonio Quartulli | e2cbc11 | 2011-05-08 20:52:57 +0200 | [diff] [blame] | 764 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
| 765 | goto err_unlock; |
| 766 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 767 | rcu_read_unlock(); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 768 | return router; |
Marek Lindner | 01df2b6 | 2011-05-05 14:14:46 +0200 | [diff] [blame] | 769 | err_unlock: |
| 770 | rcu_read_unlock(); |
| 771 | err: |
| 772 | if (router) |
| 773 | neigh_node_free_ref(router); |
| 774 | return NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 775 | } |
| 776 | |
| 777 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) |
| 778 | { |
| 779 | struct ethhdr *ethhdr; |
| 780 | |
| 781 | /* drop packet if it has not necessary minimum size */ |
| 782 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 783 | return -1; |
| 784 | |
| 785 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 786 | |
| 787 | /* packet with unicast indication but broadcast recipient */ |
| 788 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
| 789 | return -1; |
| 790 | |
| 791 | /* packet with broadcast sender address */ |
| 792 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
| 793 | return -1; |
| 794 | |
| 795 | /* not for me */ |
| 796 | if (!is_my_mac(ethhdr->h_dest)) |
| 797 | return -1; |
| 798 | |
| 799 | return 0; |
| 800 | } |
| 801 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 802 | 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] | 803 | { |
| 804 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 805 | struct orig_node *orig_node = NULL; |
| 806 | struct neigh_node *neigh_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 807 | struct unicast_packet *unicast_packet; |
| 808 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 809 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 810 | struct sk_buff *new_skb; |
| 811 | |
| 812 | unicast_packet = (struct unicast_packet *)skb->data; |
| 813 | |
| 814 | /* TTL exceeded */ |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 815 | if (unicast_packet->header.ttl < 2) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 816 | pr_debug("Warning - can't forward unicast packet from %pM to " |
| 817 | "%pM: ttl exceeded\n", ethhdr->h_source, |
| 818 | unicast_packet->dest); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 819 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 820 | } |
| 821 | |
| 822 | /* get routing information */ |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 823 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
| 824 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 825 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 826 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 827 | |
Simon Wunderlich | a4c135c | 2011-01-19 20:01:43 +0000 | [diff] [blame] | 828 | /* find_router() increases neigh_nodes refcount if found. */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 829 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 830 | |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 831 | if (!neigh_node) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 832 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 833 | |
| 834 | /* create a copy of the skb, if needed, to modify it. */ |
| 835 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 836 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 837 | |
| 838 | unicast_packet = (struct unicast_packet *)skb->data; |
| 839 | |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 840 | if (unicast_packet->header.packet_type == BAT_UNICAST && |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 841 | atomic_read(&bat_priv->fragmentation) && |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 842 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
| 843 | ret = frag_send_skb(skb, bat_priv, |
| 844 | neigh_node->if_incoming, neigh_node->addr); |
| 845 | goto out; |
| 846 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 847 | |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 848 | if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG && |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 849 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 850 | |
| 851 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 852 | |
| 853 | if (ret == NET_RX_DROP) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 854 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 855 | |
| 856 | /* packet was buffered for late merge */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 857 | if (!new_skb) { |
| 858 | ret = NET_RX_SUCCESS; |
| 859 | goto out; |
| 860 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 861 | |
| 862 | skb = new_skb; |
| 863 | unicast_packet = (struct unicast_packet *)skb->data; |
| 864 | } |
| 865 | |
| 866 | /* decrement ttl */ |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 867 | unicast_packet->header.ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 868 | |
| 869 | /* route it */ |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 870 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 871 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 872 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 873 | out: |
| 874 | if (neigh_node) |
| 875 | neigh_node_free_ref(neigh_node); |
| 876 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 877 | orig_node_free_ref(orig_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 878 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 879 | } |
| 880 | |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 881 | static int check_unicast_ttvn(struct bat_priv *bat_priv, |
| 882 | struct sk_buff *skb) { |
| 883 | uint8_t curr_ttvn; |
| 884 | struct orig_node *orig_node; |
| 885 | struct ethhdr *ethhdr; |
| 886 | struct hard_iface *primary_if; |
| 887 | struct unicast_packet *unicast_packet; |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 888 | bool tt_poss_change; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 889 | |
| 890 | /* I could need to modify it */ |
| 891 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) |
| 892 | return 0; |
| 893 | |
| 894 | unicast_packet = (struct unicast_packet *)skb->data; |
| 895 | |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 896 | if (is_my_mac(unicast_packet->dest)) { |
| 897 | tt_poss_change = bat_priv->tt_poss_change; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 898 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 899 | } else { |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 900 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
| 901 | |
| 902 | if (!orig_node) |
| 903 | return 0; |
| 904 | |
| 905 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 906 | tt_poss_change = orig_node->tt_poss_change; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 907 | orig_node_free_ref(orig_node); |
| 908 | } |
| 909 | |
| 910 | /* Check whether I have to reroute the packet */ |
Antonio Quartulli | cc47f66 | 2011-04-27 14:27:57 +0200 | [diff] [blame] | 911 | if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 912 | /* Linearize the skb before accessing it */ |
| 913 | if (skb_linearize(skb) < 0) |
| 914 | return 0; |
| 915 | |
| 916 | ethhdr = (struct ethhdr *)(skb->data + |
| 917 | sizeof(struct unicast_packet)); |
Antonio Quartulli | 3d393e4 | 2011-07-07 15:35:37 +0200 | [diff] [blame] | 918 | orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest); |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 919 | |
| 920 | if (!orig_node) { |
| 921 | if (!is_my_client(bat_priv, ethhdr->h_dest)) |
| 922 | return 0; |
| 923 | primary_if = primary_if_get_selected(bat_priv); |
| 924 | if (!primary_if) |
| 925 | return 0; |
| 926 | memcpy(unicast_packet->dest, |
| 927 | primary_if->net_dev->dev_addr, ETH_ALEN); |
| 928 | hardif_free_ref(primary_if); |
| 929 | } else { |
| 930 | memcpy(unicast_packet->dest, orig_node->orig, |
| 931 | ETH_ALEN); |
| 932 | curr_ttvn = (uint8_t) |
| 933 | atomic_read(&orig_node->last_ttvn); |
| 934 | orig_node_free_ref(orig_node); |
| 935 | } |
| 936 | |
| 937 | bat_dbg(DBG_ROUTES, bat_priv, "TTVN mismatch (old_ttvn %u " |
| 938 | "new_ttvn %u)! Rerouting unicast packet (for %pM) to " |
| 939 | "%pM\n", unicast_packet->ttvn, curr_ttvn, |
| 940 | ethhdr->h_dest, unicast_packet->dest); |
| 941 | |
| 942 | unicast_packet->ttvn = curr_ttvn; |
| 943 | } |
| 944 | return 1; |
| 945 | } |
| 946 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 947 | 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] | 948 | { |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 949 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 950 | struct unicast_packet *unicast_packet; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 951 | int hdr_size = sizeof(*unicast_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 952 | |
| 953 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 954 | return NET_RX_DROP; |
| 955 | |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 956 | if (!check_unicast_ttvn(bat_priv, skb)) |
| 957 | return NET_RX_DROP; |
| 958 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 959 | unicast_packet = (struct unicast_packet *)skb->data; |
| 960 | |
| 961 | /* packet for me */ |
| 962 | if (is_my_mac(unicast_packet->dest)) { |
| 963 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
| 964 | return NET_RX_SUCCESS; |
| 965 | } |
| 966 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 967 | return route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 968 | } |
| 969 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 970 | 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] | 971 | { |
| 972 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 973 | struct unicast_frag_packet *unicast_packet; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 974 | int hdr_size = sizeof(*unicast_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 975 | struct sk_buff *new_skb = NULL; |
| 976 | int ret; |
| 977 | |
| 978 | if (check_unicast_packet(skb, hdr_size) < 0) |
| 979 | return NET_RX_DROP; |
| 980 | |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 981 | if (!check_unicast_ttvn(bat_priv, skb)) |
| 982 | return NET_RX_DROP; |
| 983 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 984 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
| 985 | |
| 986 | /* packet for me */ |
| 987 | if (is_my_mac(unicast_packet->dest)) { |
| 988 | |
| 989 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); |
| 990 | |
| 991 | if (ret == NET_RX_DROP) |
| 992 | return NET_RX_DROP; |
| 993 | |
| 994 | /* packet was buffered for late merge */ |
| 995 | if (!new_skb) |
| 996 | return NET_RX_SUCCESS; |
| 997 | |
| 998 | interface_rx(recv_if->soft_iface, new_skb, recv_if, |
| 999 | sizeof(struct unicast_packet)); |
| 1000 | return NET_RX_SUCCESS; |
| 1001 | } |
| 1002 | |
Linus Lüssing | 7cefb14 | 2011-03-02 17:39:31 +0000 | [diff] [blame] | 1003 | return route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1007 | 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] | 1008 | { |
| 1009 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1010 | struct orig_node *orig_node = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1011 | struct bcast_packet *bcast_packet; |
| 1012 | struct ethhdr *ethhdr; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1013 | int hdr_size = sizeof(*bcast_packet); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1014 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1015 | int32_t seq_diff; |
| 1016 | |
| 1017 | /* drop packet if it has not necessary minimum size */ |
| 1018 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1019 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1020 | |
| 1021 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1022 | |
| 1023 | /* packet with broadcast indication but unicast recipient */ |
| 1024 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1025 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1026 | |
| 1027 | /* packet with broadcast sender address */ |
| 1028 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1029 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1030 | |
| 1031 | /* ignore broadcasts sent by myself */ |
| 1032 | if (is_my_mac(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1033 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1034 | |
| 1035 | bcast_packet = (struct bcast_packet *)skb->data; |
| 1036 | |
| 1037 | /* ignore broadcasts originated by myself */ |
| 1038 | if (is_my_mac(bcast_packet->orig)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1039 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1040 | |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 1041 | if (bcast_packet->header.ttl < 2) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1042 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1043 | |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 1044 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1045 | |
| 1046 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 1047 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1048 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1049 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1050 | |
| 1051 | /* check whether the packet is a duplicate */ |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1052 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
| 1053 | ntohl(bcast_packet->seqno))) |
| 1054 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1055 | |
| 1056 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; |
| 1057 | |
| 1058 | /* check whether the packet is old and the host just restarted. */ |
| 1059 | if (window_protected(bat_priv, seq_diff, |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1060 | &orig_node->bcast_seqno_reset)) |
| 1061 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1062 | |
| 1063 | /* mark broadcast in flood history, update window position |
| 1064 | * if required. */ |
| 1065 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
| 1066 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
| 1067 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1068 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1069 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1070 | /* rebroadcast packet */ |
Antonio Quartulli | 8698529 | 2011-06-25 19:09:12 +0200 | [diff] [blame] | 1071 | add_bcast_packet_to_list(bat_priv, skb, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1072 | |
| 1073 | /* broadcast for me */ |
| 1074 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1075 | ret = NET_RX_SUCCESS; |
| 1076 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1077 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1078 | spin_unlock: |
| 1079 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1080 | out: |
| 1081 | if (orig_node) |
Marek Lindner | 7b36e8e | 2011-02-18 12:28:10 +0000 | [diff] [blame] | 1082 | orig_node_free_ref(orig_node); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1083 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1084 | } |
| 1085 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 1086 | 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] | 1087 | { |
| 1088 | struct vis_packet *vis_packet; |
| 1089 | struct ethhdr *ethhdr; |
| 1090 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1091 | int hdr_size = sizeof(*vis_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1092 | |
| 1093 | /* keep skb linear */ |
| 1094 | if (skb_linearize(skb) < 0) |
| 1095 | return NET_RX_DROP; |
| 1096 | |
| 1097 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
| 1098 | return NET_RX_DROP; |
| 1099 | |
| 1100 | vis_packet = (struct vis_packet *)skb->data; |
| 1101 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| 1102 | |
| 1103 | /* not for me */ |
| 1104 | if (!is_my_mac(ethhdr->h_dest)) |
| 1105 | return NET_RX_DROP; |
| 1106 | |
| 1107 | /* ignore own packets */ |
| 1108 | if (is_my_mac(vis_packet->vis_orig)) |
| 1109 | return NET_RX_DROP; |
| 1110 | |
| 1111 | if (is_my_mac(vis_packet->sender_orig)) |
| 1112 | return NET_RX_DROP; |
| 1113 | |
| 1114 | switch (vis_packet->vis_type) { |
| 1115 | case VIS_TYPE_SERVER_SYNC: |
| 1116 | receive_server_sync_packet(bat_priv, vis_packet, |
| 1117 | skb_headlen(skb)); |
| 1118 | break; |
| 1119 | |
| 1120 | case VIS_TYPE_CLIENT_UPDATE: |
| 1121 | receive_client_update_packet(bat_priv, vis_packet, |
| 1122 | skb_headlen(skb)); |
| 1123 | break; |
| 1124 | |
| 1125 | default: /* ignore unknown packet */ |
| 1126 | break; |
| 1127 | } |
| 1128 | |
| 1129 | /* We take a copy of the data in the packet, so we should |
| 1130 | always free the skbuf. */ |
| 1131 | return NET_RX_DROP; |
| 1132 | } |