Antonio Quartulli | 0b87393 | 2013-01-04 03:05:31 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2011-2013 B.A.T.M.A.N. contributors: |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 2 | * |
| 3 | * Simon Wunderlich |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301, USA |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include "main.h" |
| 21 | #include "hash.h" |
| 22 | #include "hard-interface.h" |
| 23 | #include "originator.h" |
| 24 | #include "bridge_loop_avoidance.h" |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 25 | #include "translation-table.h" |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 26 | #include "send.h" |
| 27 | |
| 28 | #include <linux/etherdevice.h> |
| 29 | #include <linux/crc16.h> |
| 30 | #include <linux/if_arp.h> |
| 31 | #include <net/arp.h> |
| 32 | #include <linux/if_vlan.h> |
| 33 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 34 | static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 35 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 36 | static void batadv_bla_periodic_work(struct work_struct *work); |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 37 | static void |
| 38 | batadv_bla_send_announce(struct batadv_priv *bat_priv, |
| 39 | struct batadv_bla_backbone_gw *backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 40 | |
| 41 | /* return the index of the claim */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 42 | static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 43 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 44 | struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 45 | uint32_t hash = 0; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 46 | |
Simon Wunderlich | 07568d0 | 2012-08-30 18:22:27 +0200 | [diff] [blame] | 47 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
| 48 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 49 | |
| 50 | hash += (hash << 3); |
| 51 | hash ^= (hash >> 11); |
| 52 | hash += (hash << 15); |
| 53 | |
| 54 | return hash % size; |
| 55 | } |
| 56 | |
| 57 | /* return the index of the backbone gateway */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 58 | static inline uint32_t batadv_choose_backbone_gw(const void *data, |
| 59 | uint32_t size) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 60 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 61 | const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 62 | uint32_t hash = 0; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 63 | |
Simon Wunderlich | 07568d0 | 2012-08-30 18:22:27 +0200 | [diff] [blame] | 64 | hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); |
| 65 | hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 66 | |
| 67 | hash += (hash << 3); |
| 68 | hash ^= (hash >> 11); |
| 69 | hash += (hash << 15); |
| 70 | |
| 71 | return hash % size; |
| 72 | } |
| 73 | |
| 74 | |
| 75 | /* compares address and vid of two backbone gws */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 76 | static int batadv_compare_backbone_gw(const struct hlist_node *node, |
| 77 | const void *data2) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 78 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 79 | const void *data1 = container_of(node, struct batadv_bla_backbone_gw, |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 80 | hash_entry); |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 81 | const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 82 | |
Simon Wunderlich | c76d152 | 2012-10-15 22:38:04 +0200 | [diff] [blame] | 83 | if (!batadv_compare_eth(gw1->orig, gw2->orig)) |
| 84 | return 0; |
| 85 | |
| 86 | if (gw1->vid != gw2->vid) |
| 87 | return 0; |
| 88 | |
| 89 | return 1; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | /* compares address and vid of two claims */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 93 | static int batadv_compare_claim(const struct hlist_node *node, |
| 94 | const void *data2) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 95 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 96 | const void *data1 = container_of(node, struct batadv_bla_claim, |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 97 | hash_entry); |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 98 | const struct batadv_bla_claim *cl1 = data1, *cl2 = data2; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 99 | |
Simon Wunderlich | c76d152 | 2012-10-15 22:38:04 +0200 | [diff] [blame] | 100 | if (!batadv_compare_eth(cl1->addr, cl2->addr)) |
| 101 | return 0; |
| 102 | |
| 103 | if (cl1->vid != cl2->vid) |
| 104 | return 0; |
| 105 | |
| 106 | return 1; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /* free a backbone gw */ |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 110 | static void |
| 111 | batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 112 | { |
| 113 | if (atomic_dec_and_test(&backbone_gw->refcount)) |
| 114 | kfree_rcu(backbone_gw, rcu); |
| 115 | } |
| 116 | |
| 117 | /* finally deinitialize the claim */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 118 | static void batadv_claim_free_rcu(struct rcu_head *rcu) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 119 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 120 | struct batadv_bla_claim *claim; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 121 | |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 122 | claim = container_of(rcu, struct batadv_bla_claim, rcu); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 123 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 124 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 125 | kfree(claim); |
| 126 | } |
| 127 | |
| 128 | /* free a claim, call claim_free_rcu if its the last reference */ |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 129 | static void batadv_claim_free_ref(struct batadv_bla_claim *claim) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 130 | { |
| 131 | if (atomic_dec_and_test(&claim->refcount)) |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 132 | call_rcu(&claim->rcu, batadv_claim_free_rcu); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 133 | } |
| 134 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 135 | /* @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 136 | * @data: search data (may be local/static data) |
| 137 | * |
| 138 | * looks for a claim in the hash, and returns it if found |
| 139 | * or NULL otherwise. |
| 140 | */ |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 141 | static struct batadv_bla_claim |
| 142 | *batadv_claim_hash_find(struct batadv_priv *bat_priv, |
| 143 | struct batadv_bla_claim *data) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 144 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 145 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 146 | struct hlist_head *head; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 147 | struct batadv_bla_claim *claim; |
| 148 | struct batadv_bla_claim *claim_tmp = NULL; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 149 | int index; |
| 150 | |
| 151 | if (!hash) |
| 152 | return NULL; |
| 153 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 154 | index = batadv_choose_claim(data, hash->size); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 155 | head = &hash->table[index]; |
| 156 | |
| 157 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 158 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 159 | if (!batadv_compare_claim(&claim->hash_entry, data)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 160 | continue; |
| 161 | |
| 162 | if (!atomic_inc_not_zero(&claim->refcount)) |
| 163 | continue; |
| 164 | |
| 165 | claim_tmp = claim; |
| 166 | break; |
| 167 | } |
| 168 | rcu_read_unlock(); |
| 169 | |
| 170 | return claim_tmp; |
| 171 | } |
| 172 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 173 | /** |
| 174 | * batadv_backbone_hash_find - looks for a claim in the hash |
| 175 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 176 | * @addr: the address of the originator |
| 177 | * @vid: the VLAN ID |
| 178 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 179 | * Returns claim if found or NULL otherwise. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 180 | */ |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 181 | static struct batadv_bla_backbone_gw * |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 182 | batadv_backbone_hash_find(struct batadv_priv *bat_priv, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 183 | uint8_t *addr, unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 184 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 185 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 186 | struct hlist_head *head; |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 187 | struct batadv_bla_backbone_gw search_entry, *backbone_gw; |
| 188 | struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 189 | int index; |
| 190 | |
| 191 | if (!hash) |
| 192 | return NULL; |
| 193 | |
| 194 | memcpy(search_entry.orig, addr, ETH_ALEN); |
| 195 | search_entry.vid = vid; |
| 196 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 197 | index = batadv_choose_backbone_gw(&search_entry, hash->size); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 198 | head = &hash->table[index]; |
| 199 | |
| 200 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 201 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 202 | if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry, |
| 203 | &search_entry)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 204 | continue; |
| 205 | |
| 206 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) |
| 207 | continue; |
| 208 | |
| 209 | backbone_gw_tmp = backbone_gw; |
| 210 | break; |
| 211 | } |
| 212 | rcu_read_unlock(); |
| 213 | |
| 214 | return backbone_gw_tmp; |
| 215 | } |
| 216 | |
| 217 | /* delete all claims for a backbone */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 218 | static void |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 219 | batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 220 | { |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 221 | struct batadv_hashtable *hash; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 222 | struct hlist_node *node_tmp; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 223 | struct hlist_head *head; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 224 | struct batadv_bla_claim *claim; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 225 | int i; |
| 226 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 227 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 228 | hash = backbone_gw->bat_priv->bla.claim_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 229 | if (!hash) |
| 230 | return; |
| 231 | |
| 232 | for (i = 0; i < hash->size; i++) { |
| 233 | head = &hash->table[i]; |
| 234 | list_lock = &hash->list_locks[i]; |
| 235 | |
| 236 | spin_lock_bh(list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 237 | hlist_for_each_entry_safe(claim, node_tmp, |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 238 | head, hash_entry) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 239 | if (claim->backbone_gw != backbone_gw) |
| 240 | continue; |
| 241 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 242 | batadv_claim_free_ref(claim); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 243 | hlist_del_rcu(&claim->hash_entry); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 244 | } |
| 245 | spin_unlock_bh(list_lock); |
| 246 | } |
| 247 | |
| 248 | /* all claims gone, intialize CRC */ |
Sven Eckelmann | 3964f72 | 2012-06-03 22:19:10 +0200 | [diff] [blame] | 249 | backbone_gw->crc = BATADV_BLA_CRC_INIT; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 250 | } |
| 251 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 252 | /** |
| 253 | * batadv_bla_send_claim - sends a claim frame according to the provided info |
| 254 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 255 | * @orig: the mac address to be announced within the claim |
| 256 | * @vid: the VLAN ID |
| 257 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 258 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 259 | static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 260 | unsigned short vid, int claimtype) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 261 | { |
| 262 | struct sk_buff *skb; |
| 263 | struct ethhdr *ethhdr; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 264 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 265 | struct net_device *soft_iface; |
| 266 | uint8_t *hw_src; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 267 | struct batadv_bla_claim_dst local_claim_dest; |
Al Viro | 3e2f1a1 | 2012-04-22 07:47:50 +0100 | [diff] [blame] | 268 | __be32 zeroip = 0; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 269 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 270 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 271 | if (!primary_if) |
| 272 | return; |
| 273 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 274 | memcpy(&local_claim_dest, &bat_priv->bla.claim_dest, |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 275 | sizeof(local_claim_dest)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 276 | local_claim_dest.type = claimtype; |
| 277 | |
| 278 | soft_iface = primary_if->soft_iface; |
| 279 | |
| 280 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, |
| 281 | /* IP DST: 0.0.0.0 */ |
| 282 | zeroip, |
| 283 | primary_if->soft_iface, |
| 284 | /* IP SRC: 0.0.0.0 */ |
| 285 | zeroip, |
| 286 | /* Ethernet DST: Broadcast */ |
| 287 | NULL, |
| 288 | /* Ethernet SRC/HW SRC: originator mac */ |
| 289 | primary_if->net_dev->dev_addr, |
Simon Wunderlich | 99e966f | 2012-06-23 12:34:17 +0200 | [diff] [blame] | 290 | /* HW DST: FF:43:05:XX:YY:YY |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 291 | * with XX = claim type |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 292 | * and YY:YY = group id |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 293 | */ |
| 294 | (uint8_t *)&local_claim_dest); |
| 295 | |
| 296 | if (!skb) |
| 297 | goto out; |
| 298 | |
| 299 | ethhdr = (struct ethhdr *)skb->data; |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 300 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 301 | |
| 302 | /* now we pretend that the client would have sent this ... */ |
| 303 | switch (claimtype) { |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 304 | case BATADV_CLAIM_TYPE_CLAIM: |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 305 | /* normal claim frame |
| 306 | * set Ethernet SRC to the clients mac |
| 307 | */ |
| 308 | memcpy(ethhdr->h_source, mac, ETH_ALEN); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 309 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 310 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, |
| 311 | BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 312 | break; |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 313 | case BATADV_CLAIM_TYPE_UNCLAIM: |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 314 | /* unclaim frame |
| 315 | * set HW SRC to the clients mac |
| 316 | */ |
| 317 | memcpy(hw_src, mac, ETH_ALEN); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 318 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 319 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 320 | BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 321 | break; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 322 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 323 | /* announcement frame |
| 324 | * set HW SRC to the special mac containg the crc |
| 325 | */ |
| 326 | memcpy(hw_src, mac, ETH_ALEN); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 327 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 328 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 329 | ethhdr->h_source, BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 330 | break; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 331 | case BATADV_CLAIM_TYPE_REQUEST: |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 332 | /* request frame |
Simon Wunderlich | 99e966f | 2012-06-23 12:34:17 +0200 | [diff] [blame] | 333 | * set HW SRC and header destination to the receiving backbone |
| 334 | * gws mac |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 335 | */ |
| 336 | memcpy(hw_src, mac, ETH_ALEN); |
| 337 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 338 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 339 | "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 340 | ethhdr->h_source, ethhdr->h_dest, |
| 341 | BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 342 | break; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 343 | } |
| 344 | |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 345 | if (vid & BATADV_VLAN_HAS_TAG) |
| 346 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
| 347 | vid & VLAN_VID_MASK); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 348 | |
| 349 | skb_reset_mac_header(skb); |
| 350 | skb->protocol = eth_type_trans(skb, soft_iface); |
Marek Lindner | 1c9b055 | 2012-06-23 11:47:53 +0200 | [diff] [blame] | 351 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
| 352 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
| 353 | skb->len + ETH_HLEN); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 354 | soft_iface->last_rx = jiffies; |
| 355 | |
| 356 | netif_rx(skb); |
| 357 | out: |
| 358 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 359 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 360 | } |
| 361 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 362 | /** |
| 363 | * batadv_bla_get_backbone_gw |
| 364 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 365 | * @orig: the mac address of the originator |
| 366 | * @vid: the VLAN ID |
| 367 | * |
| 368 | * searches for the backbone gw or creates a new one if it could not |
| 369 | * be found. |
| 370 | */ |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 371 | static struct batadv_bla_backbone_gw * |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 372 | batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 373 | unsigned short vid, bool own_backbone) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 374 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 375 | struct batadv_bla_backbone_gw *entry; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 376 | struct batadv_orig_node *orig_node; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 377 | int hash_added; |
| 378 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 379 | entry = batadv_backbone_hash_find(bat_priv, orig, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 380 | |
| 381 | if (entry) |
| 382 | return entry; |
| 383 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 384 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 385 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 386 | orig, BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 387 | |
| 388 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 389 | if (!entry) |
| 390 | return NULL; |
| 391 | |
| 392 | entry->vid = vid; |
| 393 | entry->lasttime = jiffies; |
Sven Eckelmann | 3964f72 | 2012-06-03 22:19:10 +0200 | [diff] [blame] | 394 | entry->crc = BATADV_BLA_CRC_INIT; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 395 | entry->bat_priv = bat_priv; |
| 396 | atomic_set(&entry->request_sent, 0); |
Simon Wunderlich | 2870987 | 2012-09-13 18:18:46 +0200 | [diff] [blame] | 397 | atomic_set(&entry->wait_periods, 0); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 398 | memcpy(entry->orig, orig, ETH_ALEN); |
| 399 | |
| 400 | /* one for the hash, one for returning */ |
| 401 | atomic_set(&entry->refcount, 2); |
| 402 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 403 | hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 404 | batadv_compare_backbone_gw, |
| 405 | batadv_choose_backbone_gw, entry, |
| 406 | &entry->hash_entry); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 407 | |
| 408 | if (unlikely(hash_added != 0)) { |
| 409 | /* hash failed, free the structure */ |
| 410 | kfree(entry); |
| 411 | return NULL; |
| 412 | } |
| 413 | |
Antonio Quartulli | 95fb130 | 2013-08-07 18:28:55 +0200 | [diff] [blame] | 414 | /* this is a gateway now, remove any TT entry on this VLAN */ |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 415 | orig_node = batadv_orig_hash_find(bat_priv, orig); |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 416 | if (orig_node) { |
Antonio Quartulli | 95fb130 | 2013-08-07 18:28:55 +0200 | [diff] [blame] | 417 | batadv_tt_global_del_orig(bat_priv, orig_node, vid, |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 418 | "became a backbone gateway"); |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 419 | batadv_orig_node_free_ref(orig_node); |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 420 | } |
Simon Wunderlich | 52aebd6 | 2012-09-08 18:02:53 +0200 | [diff] [blame] | 421 | |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 422 | if (own_backbone) { |
Simon Wunderlich | 52aebd6 | 2012-09-08 18:02:53 +0200 | [diff] [blame] | 423 | batadv_bla_send_announce(bat_priv, entry); |
| 424 | |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 425 | /* this will be decreased in the worker thread */ |
| 426 | atomic_inc(&entry->request_sent); |
Simon Wunderlich | 2870987 | 2012-09-13 18:18:46 +0200 | [diff] [blame] | 427 | atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS); |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 428 | atomic_inc(&bat_priv->bla.num_requests); |
| 429 | } |
| 430 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 431 | return entry; |
| 432 | } |
| 433 | |
| 434 | /* update or add the own backbone gw to make sure we announce |
| 435 | * where we receive other backbone gws |
| 436 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 437 | static void |
| 438 | batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, |
| 439 | struct batadv_hard_iface *primary_if, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 440 | unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 441 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 442 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 443 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 444 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, |
| 445 | primary_if->net_dev->dev_addr, |
Simon Wunderlich | 52aebd6 | 2012-09-08 18:02:53 +0200 | [diff] [blame] | 446 | vid, true); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 447 | if (unlikely(!backbone_gw)) |
| 448 | return; |
| 449 | |
| 450 | backbone_gw->lasttime = jiffies; |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 451 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 452 | } |
| 453 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 454 | /* @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 455 | * @vid: the vid where the request came on |
| 456 | * |
| 457 | * Repeat all of our own claims, and finally send an ANNOUNCE frame |
| 458 | * to allow the requester another check if the CRC is correct now. |
| 459 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 460 | static void batadv_bla_answer_request(struct batadv_priv *bat_priv, |
| 461 | struct batadv_hard_iface *primary_if, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 462 | unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 463 | { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 464 | struct hlist_head *head; |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 465 | struct batadv_hashtable *hash; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 466 | struct batadv_bla_claim *claim; |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 467 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 468 | int i; |
| 469 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 470 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 471 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 472 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 473 | backbone_gw = batadv_backbone_hash_find(bat_priv, |
| 474 | primary_if->net_dev->dev_addr, |
| 475 | vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 476 | if (!backbone_gw) |
| 477 | return; |
| 478 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 479 | hash = bat_priv->bla.claim_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 480 | for (i = 0; i < hash->size; i++) { |
| 481 | head = &hash->table[i]; |
| 482 | |
| 483 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 484 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 485 | /* only own claims are interesting */ |
| 486 | if (claim->backbone_gw != backbone_gw) |
| 487 | continue; |
| 488 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 489 | batadv_bla_send_claim(bat_priv, claim->addr, claim->vid, |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 490 | BATADV_CLAIM_TYPE_CLAIM); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 491 | } |
| 492 | rcu_read_unlock(); |
| 493 | } |
| 494 | |
| 495 | /* finally, send an announcement frame */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 496 | batadv_bla_send_announce(bat_priv, backbone_gw); |
| 497 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 498 | } |
| 499 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 500 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 501 | * |
| 502 | * When the crc is wrong, ask the backbone gateway for a full table update. |
| 503 | * After the request, it will repeat all of his own claims and finally |
| 504 | * send an announcement claim with which we can check again. |
| 505 | */ |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 506 | static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 507 | { |
| 508 | /* first, remove all old entries */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 509 | batadv_bla_del_backbone_claims(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 510 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 511 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
| 512 | "Sending REQUEST to %pM\n", backbone_gw->orig); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 513 | |
| 514 | /* send request */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 515 | batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 516 | backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 517 | |
| 518 | /* no local broadcasts should be sent or received, for now. */ |
| 519 | if (!atomic_read(&backbone_gw->request_sent)) { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 520 | atomic_inc(&backbone_gw->bat_priv->bla.num_requests); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 521 | atomic_set(&backbone_gw->request_sent, 1); |
| 522 | } |
| 523 | } |
| 524 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 525 | /* @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 526 | * @backbone_gw: our backbone gateway which should be announced |
| 527 | * |
| 528 | * This function sends an announcement. It is called from multiple |
| 529 | * places. |
| 530 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 531 | static void batadv_bla_send_announce(struct batadv_priv *bat_priv, |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 532 | struct batadv_bla_backbone_gw *backbone_gw) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 533 | { |
| 534 | uint8_t mac[ETH_ALEN]; |
Al Viro | 3e2f1a1 | 2012-04-22 07:47:50 +0100 | [diff] [blame] | 535 | __be16 crc; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 536 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 537 | memcpy(mac, batadv_announce_mac, 4); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 538 | crc = htons(backbone_gw->crc); |
Al Viro | 1a5852d | 2012-04-22 07:50:29 +0100 | [diff] [blame] | 539 | memcpy(&mac[4], &crc, 2); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 540 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 541 | batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid, |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 542 | BATADV_CLAIM_TYPE_ANNOUNCE); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 543 | } |
| 544 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 545 | /** |
| 546 | * batadv_bla_add_claim - Adds a claim in the claim hash |
| 547 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 548 | * @mac: the mac address of the claim |
| 549 | * @vid: the VLAN ID of the frame |
| 550 | * @backbone_gw: the backbone gateway which claims it |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 551 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 552 | static void batadv_bla_add_claim(struct batadv_priv *bat_priv, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 553 | const uint8_t *mac, const unsigned short vid, |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 554 | struct batadv_bla_backbone_gw *backbone_gw) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 555 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 556 | struct batadv_bla_claim *claim; |
| 557 | struct batadv_bla_claim search_claim; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 558 | int hash_added; |
| 559 | |
| 560 | memcpy(search_claim.addr, mac, ETH_ALEN); |
| 561 | search_claim.vid = vid; |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 562 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 563 | |
| 564 | /* create a new claim entry if it does not exist yet. */ |
| 565 | if (!claim) { |
| 566 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); |
| 567 | if (!claim) |
| 568 | return; |
| 569 | |
| 570 | memcpy(claim->addr, mac, ETH_ALEN); |
| 571 | claim->vid = vid; |
| 572 | claim->lasttime = jiffies; |
| 573 | claim->backbone_gw = backbone_gw; |
| 574 | |
| 575 | atomic_set(&claim->refcount, 2); |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 576 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 577 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 578 | mac, BATADV_PRINT_VID(vid)); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 579 | hash_added = batadv_hash_add(bat_priv->bla.claim_hash, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 580 | batadv_compare_claim, |
| 581 | batadv_choose_claim, claim, |
| 582 | &claim->hash_entry); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 583 | |
| 584 | if (unlikely(hash_added != 0)) { |
| 585 | /* only local changes happened. */ |
| 586 | kfree(claim); |
| 587 | return; |
| 588 | } |
| 589 | } else { |
| 590 | claim->lasttime = jiffies; |
| 591 | if (claim->backbone_gw == backbone_gw) |
| 592 | /* no need to register a new backbone */ |
| 593 | goto claim_free_ref; |
| 594 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 595 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 596 | "bla_add_claim(): changing ownership for %pM, vid %d\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 597 | mac, BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 598 | |
Sven Eckelmann | bbb1f90 | 2012-07-08 17:13:15 +0200 | [diff] [blame] | 599 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 600 | batadv_backbone_gw_free_ref(claim->backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 601 | } |
| 602 | /* set (new) backbone gw */ |
| 603 | atomic_inc(&backbone_gw->refcount); |
| 604 | claim->backbone_gw = backbone_gw; |
| 605 | |
| 606 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
| 607 | backbone_gw->lasttime = jiffies; |
| 608 | |
| 609 | claim_free_ref: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 610 | batadv_claim_free_ref(claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | /* Delete a claim from the claim hash which has the |
| 614 | * given mac address and vid. |
| 615 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 616 | static void batadv_bla_del_claim(struct batadv_priv *bat_priv, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 617 | const uint8_t *mac, const unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 618 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 619 | struct batadv_bla_claim search_claim, *claim; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 620 | |
| 621 | memcpy(search_claim.addr, mac, ETH_ALEN); |
| 622 | search_claim.vid = vid; |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 623 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 624 | if (!claim) |
| 625 | return; |
| 626 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 627 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 628 | mac, BATADV_PRINT_VID(vid)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 629 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 630 | batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 631 | batadv_choose_claim, claim); |
| 632 | batadv_claim_free_ref(claim); /* reference from the hash is gone */ |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 633 | |
| 634 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); |
| 635 | |
| 636 | /* don't need the reference from hash_find() anymore */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 637 | batadv_claim_free_ref(claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | /* check for ANNOUNCE frame, return 1 if handled */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 641 | static int batadv_handle_announce(struct batadv_priv *bat_priv, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 642 | uint8_t *an_addr, uint8_t *backbone_addr, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 643 | unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 644 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 645 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 646 | uint16_t crc; |
| 647 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 648 | if (memcmp(an_addr, batadv_announce_mac, 4) != 0) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 649 | return 0; |
| 650 | |
Simon Wunderlich | 52aebd6 | 2012-09-08 18:02:53 +0200 | [diff] [blame] | 651 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
| 652 | false); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 653 | |
| 654 | if (unlikely(!backbone_gw)) |
| 655 | return 1; |
| 656 | |
| 657 | |
| 658 | /* handle as ANNOUNCE frame */ |
| 659 | backbone_gw->lasttime = jiffies; |
Al Viro | 3e2f1a1 | 2012-04-22 07:47:50 +0100 | [diff] [blame] | 660 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 661 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 662 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 663 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 664 | BATADV_PRINT_VID(vid), backbone_gw->orig, crc); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 665 | |
| 666 | if (backbone_gw->crc != crc) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 667 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 668 | "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 669 | backbone_gw->orig, |
| 670 | BATADV_PRINT_VID(backbone_gw->vid), |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 671 | backbone_gw->crc, crc); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 672 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 673 | batadv_bla_send_request(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 674 | } else { |
| 675 | /* if we have sent a request and the crc was OK, |
| 676 | * we can allow traffic again. |
| 677 | */ |
| 678 | if (atomic_read(&backbone_gw->request_sent)) { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 679 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 680 | atomic_set(&backbone_gw->request_sent, 0); |
| 681 | } |
| 682 | } |
| 683 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 684 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 685 | return 1; |
| 686 | } |
| 687 | |
| 688 | /* check for REQUEST frame, return 1 if handled */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 689 | static int batadv_handle_request(struct batadv_priv *bat_priv, |
| 690 | struct batadv_hard_iface *primary_if, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 691 | uint8_t *backbone_addr, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 692 | struct ethhdr *ethhdr, unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 693 | { |
| 694 | /* check for REQUEST frame */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 695 | if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 696 | return 0; |
| 697 | |
| 698 | /* sanity check, this should not happen on a normal switch, |
| 699 | * we ignore it in this case. |
| 700 | */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 701 | if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 702 | return 1; |
| 703 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 704 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 705 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 706 | BATADV_PRINT_VID(vid), ethhdr->h_source); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 707 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 708 | batadv_bla_answer_request(bat_priv, primary_if, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 709 | return 1; |
| 710 | } |
| 711 | |
| 712 | /* check for UNCLAIM frame, return 1 if handled */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 713 | static int batadv_handle_unclaim(struct batadv_priv *bat_priv, |
| 714 | struct batadv_hard_iface *primary_if, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 715 | uint8_t *backbone_addr, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 716 | uint8_t *claim_addr, unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 717 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 718 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 719 | |
| 720 | /* unclaim in any case if it is our own */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 721 | if (primary_if && batadv_compare_eth(backbone_addr, |
| 722 | primary_if->net_dev->dev_addr)) |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 723 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 724 | BATADV_CLAIM_TYPE_UNCLAIM); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 725 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 726 | backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 727 | |
| 728 | if (!backbone_gw) |
| 729 | return 1; |
| 730 | |
| 731 | /* this must be an UNCLAIM frame */ |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 732 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 733 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 734 | claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 735 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 736 | batadv_bla_del_claim(bat_priv, claim_addr, vid); |
| 737 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 738 | return 1; |
| 739 | } |
| 740 | |
| 741 | /* check for CLAIM frame, return 1 if handled */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 742 | static int batadv_handle_claim(struct batadv_priv *bat_priv, |
| 743 | struct batadv_hard_iface *primary_if, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 744 | uint8_t *backbone_addr, uint8_t *claim_addr, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 745 | unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 746 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 747 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 748 | |
| 749 | /* register the gateway if not yet available, and add the claim. */ |
| 750 | |
Simon Wunderlich | 52aebd6 | 2012-09-08 18:02:53 +0200 | [diff] [blame] | 751 | backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid, |
| 752 | false); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 753 | |
| 754 | if (unlikely(!backbone_gw)) |
| 755 | return 1; |
| 756 | |
| 757 | /* this must be a CLAIM frame */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 758 | batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 759 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 760 | batadv_bla_send_claim(bat_priv, claim_addr, vid, |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 761 | BATADV_CLAIM_TYPE_CLAIM); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 762 | |
| 763 | /* TODO: we could call something like tt_local_del() here. */ |
| 764 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 765 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 766 | return 1; |
| 767 | } |
| 768 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 769 | /** |
| 770 | * batadv_check_claim_group |
| 771 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 772 | * @hw_src: the Hardware source in the ARP Header |
| 773 | * @hw_dst: the Hardware destination in the ARP Header |
| 774 | * @ethhdr: pointer to the Ethernet header of the claim frame |
| 775 | * |
| 776 | * checks if it is a claim packet and if its on the same group. |
| 777 | * This function also applies the group ID of the sender |
| 778 | * if it is in the same mesh. |
| 779 | * |
| 780 | * returns: |
| 781 | * 2 - if it is a claim packet and on the same group |
| 782 | * 1 - if is a claim packet from another group |
| 783 | * 0 - if it is not a claim packet |
| 784 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 785 | static int batadv_check_claim_group(struct batadv_priv *bat_priv, |
| 786 | struct batadv_hard_iface *primary_if, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 787 | uint8_t *hw_src, uint8_t *hw_dst, |
| 788 | struct ethhdr *ethhdr) |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 789 | { |
| 790 | uint8_t *backbone_addr; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 791 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 792 | struct batadv_bla_claim_dst *bla_dst, *bla_dst_own; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 793 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 794 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 795 | bla_dst_own = &bat_priv->bla.claim_dest; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 796 | |
| 797 | /* check if it is a claim packet in general */ |
| 798 | if (memcmp(bla_dst->magic, bla_dst_own->magic, |
| 799 | sizeof(bla_dst->magic)) != 0) |
| 800 | return 0; |
| 801 | |
| 802 | /* if announcement packet, use the source, |
| 803 | * otherwise assume it is in the hw_src |
| 804 | */ |
| 805 | switch (bla_dst->type) { |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 806 | case BATADV_CLAIM_TYPE_CLAIM: |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 807 | backbone_addr = hw_src; |
| 808 | break; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 809 | case BATADV_CLAIM_TYPE_REQUEST: |
| 810 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 811 | case BATADV_CLAIM_TYPE_UNCLAIM: |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 812 | backbone_addr = ethhdr->h_source; |
| 813 | break; |
| 814 | default: |
| 815 | return 0; |
| 816 | } |
| 817 | |
| 818 | /* don't accept claim frames from ourselves */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 819 | if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 820 | return 0; |
| 821 | |
| 822 | /* if its already the same group, it is fine. */ |
| 823 | if (bla_dst->group == bla_dst_own->group) |
| 824 | return 2; |
| 825 | |
| 826 | /* lets see if this originator is in our mesh */ |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 827 | orig_node = batadv_orig_hash_find(bat_priv, backbone_addr); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 828 | |
| 829 | /* dont accept claims from gateways which are not in |
| 830 | * the same mesh or group. |
| 831 | */ |
| 832 | if (!orig_node) |
| 833 | return 1; |
| 834 | |
| 835 | /* if our mesh friends mac is bigger, use it for ourselves. */ |
| 836 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 837 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 838 | "taking other backbones claim group: %#.4x\n", |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 839 | ntohs(bla_dst->group)); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 840 | bla_dst_own->group = bla_dst->group; |
| 841 | } |
| 842 | |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 843 | batadv_orig_node_free_ref(orig_node); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 844 | |
| 845 | return 2; |
| 846 | } |
| 847 | |
| 848 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 849 | /* @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 850 | * @skb: the frame to be checked |
| 851 | * |
| 852 | * Check if this is a claim frame, and process it accordingly. |
| 853 | * |
| 854 | * returns 1 if it was a claim frame, otherwise return 0 to |
| 855 | * tell the callee that it can use the frame on its own. |
| 856 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 857 | static int batadv_bla_process_claim(struct batadv_priv *bat_priv, |
| 858 | struct batadv_hard_iface *primary_if, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 859 | struct sk_buff *skb) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 860 | { |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 861 | struct batadv_bla_claim_dst *bla_dst; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 862 | uint8_t *hw_src, *hw_dst; |
| 863 | struct vlan_ethhdr *vhdr; |
| 864 | struct ethhdr *ethhdr; |
| 865 | struct arphdr *arphdr; |
| 866 | unsigned short vid; |
Antonio Quartulli | 293e933 | 2013-05-19 12:55:16 +0200 | [diff] [blame] | 867 | __be16 proto; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 868 | int headlen; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 869 | int ret; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 870 | |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 871 | vid = batadv_get_vid(skb, 0); |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 872 | ethhdr = eth_hdr(skb); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 873 | |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 874 | proto = ethhdr->h_proto; |
| 875 | headlen = ETH_HLEN; |
| 876 | if (vid & BATADV_VLAN_HAS_TAG) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 877 | vhdr = (struct vlan_ethhdr *)ethhdr; |
Antonio Quartulli | 293e933 | 2013-05-19 12:55:16 +0200 | [diff] [blame] | 878 | proto = vhdr->h_vlan_encapsulated_proto; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 879 | headlen += VLAN_HLEN; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 880 | } |
| 881 | |
Antonio Quartulli | 293e933 | 2013-05-19 12:55:16 +0200 | [diff] [blame] | 882 | if (proto != htons(ETH_P_ARP)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 883 | return 0; /* not a claim frame */ |
| 884 | |
| 885 | /* this must be a ARP frame. check if it is a claim. */ |
| 886 | |
| 887 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) |
| 888 | return 0; |
| 889 | |
| 890 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 891 | ethhdr = eth_hdr(skb); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 892 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); |
| 893 | |
| 894 | /* Check whether the ARP frame carries a valid |
| 895 | * IP information |
| 896 | */ |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 897 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
| 898 | return 0; |
| 899 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
| 900 | return 0; |
| 901 | if (arphdr->ar_hln != ETH_ALEN) |
| 902 | return 0; |
| 903 | if (arphdr->ar_pln != 4) |
| 904 | return 0; |
| 905 | |
| 906 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); |
| 907 | hw_dst = hw_src + ETH_ALEN + 4; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 908 | bla_dst = (struct batadv_bla_claim_dst *)hw_dst; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 909 | |
| 910 | /* check if it is a claim frame. */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 911 | ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst, |
| 912 | ethhdr); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 913 | if (ret == 1) |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 914 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 915 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 916 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, |
| 917 | hw_dst); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 918 | |
| 919 | if (ret < 2) |
| 920 | return ret; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 921 | |
| 922 | /* become a backbone gw ourselves on this vlan if not happened yet */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 923 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 924 | |
| 925 | /* check for the different types of claim frames ... */ |
| 926 | switch (bla_dst->type) { |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 927 | case BATADV_CLAIM_TYPE_CLAIM: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 928 | if (batadv_handle_claim(bat_priv, primary_if, hw_src, |
| 929 | ethhdr->h_source, vid)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 930 | return 1; |
| 931 | break; |
Simon Wunderlich | 3eb8773 | 2012-06-23 12:34:18 +0200 | [diff] [blame] | 932 | case BATADV_CLAIM_TYPE_UNCLAIM: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 933 | if (batadv_handle_unclaim(bat_priv, primary_if, |
| 934 | ethhdr->h_source, hw_src, vid)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 935 | return 1; |
| 936 | break; |
| 937 | |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 938 | case BATADV_CLAIM_TYPE_ANNOUNCE: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 939 | if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source, |
| 940 | vid)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 941 | return 1; |
| 942 | break; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 943 | case BATADV_CLAIM_TYPE_REQUEST: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 944 | if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr, |
| 945 | vid)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 946 | return 1; |
| 947 | break; |
| 948 | } |
| 949 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 950 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 951 | "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 952 | ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 953 | return 1; |
| 954 | } |
| 955 | |
| 956 | /* Check when we last heard from other nodes, and remove them in case of |
| 957 | * a time out, or clean all backbone gws if now is set. |
| 958 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 959 | static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 960 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 961 | struct batadv_bla_backbone_gw *backbone_gw; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 962 | struct hlist_node *node_tmp; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 963 | struct hlist_head *head; |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 964 | struct batadv_hashtable *hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 965 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 966 | int i; |
| 967 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 968 | hash = bat_priv->bla.backbone_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 969 | if (!hash) |
| 970 | return; |
| 971 | |
| 972 | for (i = 0; i < hash->size; i++) { |
| 973 | head = &hash->table[i]; |
| 974 | list_lock = &hash->list_locks[i]; |
| 975 | |
| 976 | spin_lock_bh(list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 977 | hlist_for_each_entry_safe(backbone_gw, node_tmp, |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 978 | head, hash_entry) { |
| 979 | if (now) |
| 980 | goto purge_now; |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 981 | if (!batadv_has_timed_out(backbone_gw->lasttime, |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 982 | BATADV_BLA_BACKBONE_TIMEOUT)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 983 | continue; |
| 984 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 985 | batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 986 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", |
| 987 | backbone_gw->orig); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 988 | |
| 989 | purge_now: |
| 990 | /* don't wait for the pending request anymore */ |
| 991 | if (atomic_read(&backbone_gw->request_sent)) |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 992 | atomic_dec(&bat_priv->bla.num_requests); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 993 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 994 | batadv_bla_del_backbone_claims(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 995 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 996 | hlist_del_rcu(&backbone_gw->hash_entry); |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 997 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 998 | } |
| 999 | spin_unlock_bh(list_lock); |
| 1000 | } |
| 1001 | } |
| 1002 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1003 | /** |
| 1004 | * batadv_bla_purge_claims |
| 1005 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1006 | * @primary_if: the selected primary interface, may be NULL if now is set |
| 1007 | * @now: whether the whole hash shall be wiped now |
| 1008 | * |
| 1009 | * Check when we heard last time from our own claims, and remove them in case of |
| 1010 | * a time out, or clean all claims if now is set |
| 1011 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1012 | static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, |
| 1013 | struct batadv_hard_iface *primary_if, |
| 1014 | int now) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1015 | { |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 1016 | struct batadv_bla_claim *claim; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1017 | struct hlist_head *head; |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 1018 | struct batadv_hashtable *hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1019 | int i; |
| 1020 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1021 | hash = bat_priv->bla.claim_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1022 | if (!hash) |
| 1023 | return; |
| 1024 | |
| 1025 | for (i = 0; i < hash->size; i++) { |
| 1026 | head = &hash->table[i]; |
| 1027 | |
| 1028 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1029 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1030 | if (now) |
| 1031 | goto purge_now; |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1032 | if (!batadv_compare_eth(claim->backbone_gw->orig, |
| 1033 | primary_if->net_dev->dev_addr)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1034 | continue; |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1035 | if (!batadv_has_timed_out(claim->lasttime, |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 1036 | BATADV_BLA_CLAIM_TIMEOUT)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1037 | continue; |
| 1038 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 1039 | batadv_dbg(BATADV_DBG_BLA, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1040 | "bla_purge_claims(): %pM, vid %d, time out\n", |
| 1041 | claim->addr, claim->vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1042 | |
| 1043 | purge_now: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1044 | batadv_handle_unclaim(bat_priv, primary_if, |
| 1045 | claim->backbone_gw->orig, |
| 1046 | claim->addr, claim->vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1047 | } |
| 1048 | rcu_read_unlock(); |
| 1049 | } |
| 1050 | } |
| 1051 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1052 | /** |
| 1053 | * batadv_bla_update_orig_address |
| 1054 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1055 | * @primary_if: the new selected primary_if |
| 1056 | * @oldif: the old primary interface, may be NULL |
| 1057 | * |
| 1058 | * Update the backbone gateways when the own orig address changes. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1059 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1060 | void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, |
| 1061 | struct batadv_hard_iface *primary_if, |
| 1062 | struct batadv_hard_iface *oldif) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1063 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 1064 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1065 | struct hlist_head *head; |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 1066 | struct batadv_hashtable *hash; |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1067 | __be16 group; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1068 | int i; |
| 1069 | |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1070 | /* reset bridge loop avoidance group id */ |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1071 | group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); |
| 1072 | bat_priv->bla.claim_dest.group = group; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1073 | |
Simon Wunderlich | d5b4c93 | 2013-06-07 16:52:05 +0200 | [diff] [blame] | 1074 | /* purge everything when bridge loop avoidance is turned off */ |
| 1075 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1076 | oldif = NULL; |
| 1077 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1078 | if (!oldif) { |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1079 | batadv_bla_purge_claims(bat_priv, NULL, 1); |
| 1080 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1081 | return; |
| 1082 | } |
| 1083 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1084 | hash = bat_priv->bla.backbone_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1085 | if (!hash) |
| 1086 | return; |
| 1087 | |
| 1088 | for (i = 0; i < hash->size; i++) { |
| 1089 | head = &hash->table[i]; |
| 1090 | |
| 1091 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1092 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1093 | /* own orig still holds the old value. */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1094 | if (!batadv_compare_eth(backbone_gw->orig, |
| 1095 | oldif->net_dev->dev_addr)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1096 | continue; |
| 1097 | |
| 1098 | memcpy(backbone_gw->orig, |
| 1099 | primary_if->net_dev->dev_addr, ETH_ALEN); |
| 1100 | /* send an announce frame so others will ask for our |
| 1101 | * claims and update their tables. |
| 1102 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1103 | batadv_bla_send_announce(bat_priv, backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1104 | } |
| 1105 | rcu_read_unlock(); |
| 1106 | } |
| 1107 | } |
| 1108 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1109 | /* periodic work to do: |
| 1110 | * * purge structures when they are too old |
| 1111 | * * send announcements |
| 1112 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1113 | static void batadv_bla_periodic_work(struct work_struct *work) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1114 | { |
Sven Eckelmann | bbb1f90 | 2012-07-08 17:13:15 +0200 | [diff] [blame] | 1115 | struct delayed_work *delayed_work; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1116 | struct batadv_priv *bat_priv; |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1117 | struct batadv_priv_bla *priv_bla; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1118 | struct hlist_head *head; |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 1119 | struct batadv_bla_backbone_gw *backbone_gw; |
Sven Eckelmann | 5bf74e9 | 2012-06-05 22:31:28 +0200 | [diff] [blame] | 1120 | struct batadv_hashtable *hash; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1121 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1122 | int i; |
| 1123 | |
Sven Eckelmann | bbb1f90 | 2012-07-08 17:13:15 +0200 | [diff] [blame] | 1124 | delayed_work = container_of(work, struct delayed_work, work); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1125 | priv_bla = container_of(delayed_work, struct batadv_priv_bla, work); |
| 1126 | bat_priv = container_of(priv_bla, struct batadv_priv, bla); |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1127 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1128 | if (!primary_if) |
| 1129 | goto out; |
| 1130 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1131 | batadv_bla_purge_claims(bat_priv, primary_if, 0); |
| 1132 | batadv_bla_purge_backbone_gw(bat_priv, 0); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1133 | |
| 1134 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1135 | goto out; |
| 1136 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1137 | hash = bat_priv->bla.backbone_hash; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1138 | if (!hash) |
| 1139 | goto out; |
| 1140 | |
| 1141 | for (i = 0; i < hash->size; i++) { |
| 1142 | head = &hash->table[i]; |
| 1143 | |
| 1144 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1145 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1146 | if (!batadv_compare_eth(backbone_gw->orig, |
| 1147 | primary_if->net_dev->dev_addr)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1148 | continue; |
| 1149 | |
| 1150 | backbone_gw->lasttime = jiffies; |
| 1151 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1152 | batadv_bla_send_announce(bat_priv, backbone_gw); |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 1153 | |
| 1154 | /* request_sent is only set after creation to avoid |
| 1155 | * problems when we are not yet known as backbone gw |
| 1156 | * in the backbone. |
| 1157 | * |
Simon Wunderlich | 2870987 | 2012-09-13 18:18:46 +0200 | [diff] [blame] | 1158 | * We can reset this now after we waited some periods |
| 1159 | * to give bridge forward delays and bla group forming |
| 1160 | * some grace time. |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 1161 | */ |
| 1162 | |
| 1163 | if (atomic_read(&backbone_gw->request_sent) == 0) |
| 1164 | continue; |
| 1165 | |
Simon Wunderlich | 2870987 | 2012-09-13 18:18:46 +0200 | [diff] [blame] | 1166 | if (!atomic_dec_and_test(&backbone_gw->wait_periods)) |
| 1167 | continue; |
| 1168 | |
Simon Wunderlich | d807f27 | 2012-09-09 22:27:57 +0200 | [diff] [blame] | 1169 | atomic_dec(&backbone_gw->bat_priv->bla.num_requests); |
| 1170 | atomic_set(&backbone_gw->request_sent, 0); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1171 | } |
| 1172 | rcu_read_unlock(); |
| 1173 | } |
| 1174 | out: |
| 1175 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1176 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1177 | |
Antonio Quartulli | 7241444 | 2012-12-25 13:14:37 +0100 | [diff] [blame] | 1178 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
| 1179 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1180 | } |
| 1181 | |
Sven Eckelmann | 5d52dad | 2012-03-29 12:38:20 +0200 | [diff] [blame] | 1182 | /* The hash for claim and backbone hash receive the same key because they |
| 1183 | * are getting initialized by hash_new with the same key. Reinitializing |
| 1184 | * them with to different keys to allow nested locking without generating |
| 1185 | * lockdep warnings |
| 1186 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1187 | static struct lock_class_key batadv_claim_hash_lock_class_key; |
| 1188 | static struct lock_class_key batadv_backbone_hash_lock_class_key; |
Sven Eckelmann | 5d52dad | 2012-03-29 12:38:20 +0200 | [diff] [blame] | 1189 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1190 | /* initialize all bla structures */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1191 | int batadv_bla_init(struct batadv_priv *bat_priv) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1192 | { |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1193 | int i; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1194 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1195 | struct batadv_hard_iface *primary_if; |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1196 | uint16_t crc; |
| 1197 | unsigned long entrytime; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1198 | |
Linus Lüssing | 7dac7b7 | 2012-10-17 14:53:05 +0200 | [diff] [blame] | 1199 | spin_lock_init(&bat_priv->bla.bcast_duplist_lock); |
| 1200 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 1201 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n"); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1202 | |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1203 | /* setting claim destination address */ |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1204 | memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3); |
| 1205 | bat_priv->bla.claim_dest.type = 0; |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1206 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1207 | if (primary_if) { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1208 | crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); |
| 1209 | bat_priv->bla.claim_dest.group = htons(crc); |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1210 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1211 | } else { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1212 | bat_priv->bla.claim_dest.group = 0; /* will be set later */ |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1213 | } |
| 1214 | |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1215 | /* initialize the duplicate list */ |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1216 | entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT); |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 1217 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1218 | bat_priv->bla.bcast_duplist[i].entrytime = entrytime; |
| 1219 | bat_priv->bla.bcast_duplist_curr = 0; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1220 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1221 | if (bat_priv->bla.claim_hash) |
Sven Eckelmann | 5346c35 | 2012-05-05 13:27:28 +0200 | [diff] [blame] | 1222 | return 0; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1223 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1224 | bat_priv->bla.claim_hash = batadv_hash_new(128); |
| 1225 | bat_priv->bla.backbone_hash = batadv_hash_new(32); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1226 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1227 | if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) |
Sven Eckelmann | 5346c35 | 2012-05-05 13:27:28 +0200 | [diff] [blame] | 1228 | return -ENOMEM; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1229 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1230 | batadv_hash_set_lock_class(bat_priv->bla.claim_hash, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1231 | &batadv_claim_hash_lock_class_key); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1232 | batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1233 | &batadv_backbone_hash_lock_class_key); |
Sven Eckelmann | 5d52dad | 2012-03-29 12:38:20 +0200 | [diff] [blame] | 1234 | |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 1235 | batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1236 | |
Antonio Quartulli | 7241444 | 2012-12-25 13:14:37 +0100 | [diff] [blame] | 1237 | INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work); |
| 1238 | |
| 1239 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, |
| 1240 | msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); |
Sven Eckelmann | 5346c35 | 2012-05-05 13:27:28 +0200 | [diff] [blame] | 1241 | return 0; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1242 | } |
| 1243 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1244 | /** |
| 1245 | * batadv_bla_check_bcast_duplist |
| 1246 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1247 | * @skb: contains the bcast_packet to be checked |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1248 | * |
| 1249 | * check if it is on our broadcast list. Another gateway might |
| 1250 | * have sent the same packet because it is connected to the same backbone, |
| 1251 | * so we have to remove this duplicate. |
| 1252 | * |
| 1253 | * This is performed by checking the CRC, which will tell us |
| 1254 | * with a good chance that it is the same packet. If it is furthermore |
| 1255 | * sent by another host, drop it. We allow equal packets from |
| 1256 | * the same host however as this might be intended. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 1257 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1258 | int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1259 | struct sk_buff *skb) |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1260 | { |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1261 | int i, curr, ret = 0; |
| 1262 | __be32 crc; |
| 1263 | struct batadv_bcast_packet *bcast_packet; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1264 | struct batadv_bcast_duplist_entry *entry; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1265 | |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1266 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1267 | |
| 1268 | /* calculate the crc ... */ |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1269 | crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1)); |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1270 | |
Linus Lüssing | 7dac7b7 | 2012-10-17 14:53:05 +0200 | [diff] [blame] | 1271 | spin_lock_bh(&bat_priv->bla.bcast_duplist_lock); |
| 1272 | |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 1273 | for (i = 0; i < BATADV_DUPLIST_SIZE; i++) { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1274 | curr = (bat_priv->bla.bcast_duplist_curr + i); |
| 1275 | curr %= BATADV_DUPLIST_SIZE; |
| 1276 | entry = &bat_priv->bla.bcast_duplist[curr]; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1277 | |
| 1278 | /* we can stop searching if the entry is too old ; |
| 1279 | * later entries will be even older |
| 1280 | */ |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 1281 | if (batadv_has_timed_out(entry->entrytime, |
| 1282 | BATADV_DUPLIST_TIMEOUT)) |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1283 | break; |
| 1284 | |
| 1285 | if (entry->crc != crc) |
| 1286 | continue; |
| 1287 | |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1288 | if (batadv_compare_eth(entry->orig, bcast_packet->orig)) |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1289 | continue; |
| 1290 | |
| 1291 | /* this entry seems to match: same crc, not too old, |
| 1292 | * and from another gw. therefore return 1 to forbid it. |
| 1293 | */ |
Linus Lüssing | 7dac7b7 | 2012-10-17 14:53:05 +0200 | [diff] [blame] | 1294 | ret = 1; |
| 1295 | goto out; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1296 | } |
Linus Lüssing | 7dac7b7 | 2012-10-17 14:53:05 +0200 | [diff] [blame] | 1297 | /* not found, add a new entry (overwrite the oldest entry) |
| 1298 | * and allow it, its the first occurence. |
| 1299 | */ |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1300 | curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1); |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 1301 | curr %= BATADV_DUPLIST_SIZE; |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1302 | entry = &bat_priv->bla.bcast_duplist[curr]; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1303 | entry->crc = crc; |
| 1304 | entry->entrytime = jiffies; |
| 1305 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1306 | bat_priv->bla.bcast_duplist_curr = curr; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1307 | |
Linus Lüssing | 7dac7b7 | 2012-10-17 14:53:05 +0200 | [diff] [blame] | 1308 | out: |
| 1309 | spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock); |
| 1310 | |
| 1311 | return ret; |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1312 | } |
| 1313 | |
| 1314 | |
| 1315 | |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 1316 | /* @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1317 | * @orig: originator mac address |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1318 | * @vid: VLAN identifier |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1319 | * |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1320 | * Check if the originator is a gateway for the VLAN identified by vid. |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1321 | * |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1322 | * Returns true if orig is a backbone for this vid, false otherwise. |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1323 | */ |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1324 | bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig, |
| 1325 | unsigned short vid) |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1326 | { |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1327 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1328 | struct hlist_head *head; |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 1329 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1330 | int i; |
| 1331 | |
| 1332 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1333 | return false; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1334 | |
| 1335 | if (!hash) |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1336 | return false; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1337 | |
| 1338 | for (i = 0; i < hash->size; i++) { |
| 1339 | head = &hash->table[i]; |
| 1340 | |
| 1341 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1342 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1343 | if (batadv_compare_eth(backbone_gw->orig, orig) && |
| 1344 | backbone_gw->vid == vid) { |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1345 | rcu_read_unlock(); |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1346 | return true; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1347 | } |
| 1348 | } |
| 1349 | rcu_read_unlock(); |
| 1350 | } |
| 1351 | |
Antonio Quartulli | cfd4f75 | 2013-08-07 18:28:56 +0200 | [diff] [blame^] | 1352 | return false; |
Simon Wunderlich | 20ff9d5 | 2012-01-22 20:00:23 +0100 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1356 | /** |
| 1357 | * batadv_bla_is_backbone_gw |
| 1358 | * @skb: the frame to be checked |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1359 | * @orig_node: the orig_node of the frame |
| 1360 | * @hdr_size: maximum length of the frame |
| 1361 | * |
| 1362 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 |
| 1363 | * if the orig_node is also a gateway on the soft interface, otherwise it |
| 1364 | * returns 0. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1365 | */ |
Sven Eckelmann | 08adf15 | 2012-05-12 13:38:47 +0200 | [diff] [blame] | 1366 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1367 | struct batadv_orig_node *orig_node, int hdr_size) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1368 | { |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 1369 | struct batadv_bla_backbone_gw *backbone_gw; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 1370 | unsigned short vid; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1371 | |
| 1372 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) |
| 1373 | return 0; |
| 1374 | |
| 1375 | /* first, find out the vid. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 1376 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1377 | return 0; |
| 1378 | |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 1379 | vid = batadv_get_vid(skb, hdr_size); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1380 | |
| 1381 | /* see if this originator is a backbone gw for this VLAN */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1382 | backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv, |
| 1383 | orig_node->orig, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1384 | if (!backbone_gw) |
| 1385 | return 0; |
| 1386 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1387 | batadv_backbone_gw_free_ref(backbone_gw); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1388 | return 1; |
| 1389 | } |
| 1390 | |
| 1391 | /* free all bla structures (for softinterface free or module unload) */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1392 | void batadv_bla_free(struct batadv_priv *bat_priv) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1393 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1394 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1395 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1396 | cancel_delayed_work_sync(&bat_priv->bla.work); |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1397 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1398 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1399 | if (bat_priv->bla.claim_hash) { |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1400 | batadv_bla_purge_claims(bat_priv, primary_if, 1); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1401 | batadv_hash_destroy(bat_priv->bla.claim_hash); |
| 1402 | bat_priv->bla.claim_hash = NULL; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1403 | } |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1404 | if (bat_priv->bla.backbone_hash) { |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1405 | batadv_bla_purge_backbone_gw(bat_priv, 1); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1406 | batadv_hash_destroy(bat_priv->bla.backbone_hash); |
| 1407 | bat_priv->bla.backbone_hash = NULL; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1408 | } |
| 1409 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1410 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1411 | } |
| 1412 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1413 | /** |
| 1414 | * batadv_bla_rx |
| 1415 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1416 | * @skb: the frame to be checked |
| 1417 | * @vid: the VLAN ID of the frame |
Simon Wunderlich | 2d3f6cc | 2012-07-04 20:38:19 +0200 | [diff] [blame] | 1418 | * @is_bcast: the packet came in a broadcast packet type. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1419 | * |
| 1420 | * bla_rx avoidance checks if: |
| 1421 | * * we have to race for a claim |
| 1422 | * * if the frame is allowed on the LAN |
| 1423 | * |
| 1424 | * in these cases, the skb is further handled by this function and |
| 1425 | * returns 1, otherwise it returns 0 and the caller shall further |
| 1426 | * process the skb. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1427 | */ |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 1428 | int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 1429 | unsigned short vid, bool is_bcast) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1430 | { |
| 1431 | struct ethhdr *ethhdr; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 1432 | struct batadv_bla_claim search_claim, *claim = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1433 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1434 | int ret; |
| 1435 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 1436 | ethhdr = eth_hdr(skb); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1437 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1438 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1439 | if (!primary_if) |
| 1440 | goto handled; |
| 1441 | |
| 1442 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1443 | goto allow; |
| 1444 | |
| 1445 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1446 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1447 | /* don't allow broadcasts while requests are in flight */ |
Simon Wunderlich | 2d3f6cc | 2012-07-04 20:38:19 +0200 | [diff] [blame] | 1448 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1449 | goto handled; |
| 1450 | |
| 1451 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); |
| 1452 | search_claim.vid = vid; |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1453 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1454 | |
| 1455 | if (!claim) { |
| 1456 | /* possible optimization: race for a claim */ |
| 1457 | /* No claim exists yet, claim it for us! |
| 1458 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1459 | batadv_handle_claim(bat_priv, primary_if, |
| 1460 | primary_if->net_dev->dev_addr, |
| 1461 | ethhdr->h_source, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1462 | goto allow; |
| 1463 | } |
| 1464 | |
| 1465 | /* if it is our own claim ... */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1466 | if (batadv_compare_eth(claim->backbone_gw->orig, |
| 1467 | primary_if->net_dev->dev_addr)) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1468 | /* ... allow it in any case */ |
| 1469 | claim->lasttime = jiffies; |
| 1470 | goto allow; |
| 1471 | } |
| 1472 | |
| 1473 | /* if it is a broadcast ... */ |
Simon Wunderlich | 2d3f6cc | 2012-07-04 20:38:19 +0200 | [diff] [blame] | 1474 | if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) { |
| 1475 | /* ... drop it. the responsible gateway is in charge. |
| 1476 | * |
| 1477 | * We need to check is_bcast because with the gateway |
| 1478 | * feature, broadcasts (like DHCP requests) may be sent |
| 1479 | * using a unicast packet type. |
| 1480 | */ |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1481 | goto handled; |
| 1482 | } else { |
| 1483 | /* seems the client considers us as its best gateway. |
| 1484 | * send a claim and update the claim table |
| 1485 | * immediately. |
| 1486 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1487 | batadv_handle_claim(bat_priv, primary_if, |
| 1488 | primary_if->net_dev->dev_addr, |
| 1489 | ethhdr->h_source, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1490 | goto allow; |
| 1491 | } |
| 1492 | allow: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1493 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1494 | ret = 0; |
| 1495 | goto out; |
| 1496 | |
| 1497 | handled: |
| 1498 | kfree_skb(skb); |
| 1499 | ret = 1; |
| 1500 | |
| 1501 | out: |
| 1502 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1503 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1504 | if (claim) |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1505 | batadv_claim_free_ref(claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1506 | return ret; |
| 1507 | } |
| 1508 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1509 | /** |
| 1510 | * batadv_bla_tx |
| 1511 | * @bat_priv: the bat priv with all the soft interface information |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1512 | * @skb: the frame to be checked |
| 1513 | * @vid: the VLAN ID of the frame |
| 1514 | * |
| 1515 | * bla_tx checks if: |
| 1516 | * * a claim was received which has to be processed |
| 1517 | * * the frame is allowed on the mesh |
| 1518 | * |
| 1519 | * in these cases, the skb is further handled by this function and |
| 1520 | * returns 1, otherwise it returns 0 and the caller shall further |
| 1521 | * process the skb. |
Linus Lüssing | 9d2c948 | 2013-08-06 20:21:15 +0200 | [diff] [blame] | 1522 | * |
| 1523 | * This call might reallocate skb data. |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1524 | */ |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 1525 | int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 1526 | unsigned short vid) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1527 | { |
| 1528 | struct ethhdr *ethhdr; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 1529 | struct batadv_bla_claim search_claim, *claim = NULL; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1530 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1531 | int ret = 0; |
| 1532 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1533 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1534 | if (!primary_if) |
| 1535 | goto out; |
| 1536 | |
| 1537 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) |
| 1538 | goto allow; |
| 1539 | |
| 1540 | /* in VLAN case, the mac header might not be set. */ |
| 1541 | skb_reset_mac_header(skb); |
| 1542 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1543 | if (batadv_bla_process_claim(bat_priv, primary_if, skb)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1544 | goto handled; |
| 1545 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 1546 | ethhdr = eth_hdr(skb); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1547 | |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1548 | if (unlikely(atomic_read(&bat_priv->bla.num_requests))) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1549 | /* don't allow broadcasts while requests are in flight */ |
| 1550 | if (is_multicast_ether_addr(ethhdr->h_dest)) |
| 1551 | goto handled; |
| 1552 | |
| 1553 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); |
| 1554 | search_claim.vid = vid; |
| 1555 | |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1556 | claim = batadv_claim_hash_find(bat_priv, &search_claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1557 | |
| 1558 | /* if no claim exists, allow it. */ |
| 1559 | if (!claim) |
| 1560 | goto allow; |
| 1561 | |
| 1562 | /* check if we are responsible. */ |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1563 | if (batadv_compare_eth(claim->backbone_gw->orig, |
| 1564 | primary_if->net_dev->dev_addr)) { |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1565 | /* if yes, the client has roamed and we have |
| 1566 | * to unclaim it. |
| 1567 | */ |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1568 | batadv_handle_unclaim(bat_priv, primary_if, |
| 1569 | primary_if->net_dev->dev_addr, |
| 1570 | ethhdr->h_source, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1571 | goto allow; |
| 1572 | } |
| 1573 | |
| 1574 | /* check if it is a multicast/broadcast frame */ |
| 1575 | if (is_multicast_ether_addr(ethhdr->h_dest)) { |
| 1576 | /* drop it. the responsible gateway has forwarded it into |
| 1577 | * the backbone network. |
| 1578 | */ |
| 1579 | goto handled; |
| 1580 | } else { |
| 1581 | /* we must allow it. at least if we are |
| 1582 | * responsible for the DESTINATION. |
| 1583 | */ |
| 1584 | goto allow; |
| 1585 | } |
| 1586 | allow: |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1587 | batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1588 | ret = 0; |
| 1589 | goto out; |
| 1590 | handled: |
| 1591 | ret = 1; |
| 1592 | out: |
| 1593 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1594 | batadv_hardif_free_ref(primary_if); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1595 | if (claim) |
Sven Eckelmann | 3b300de | 2012-05-12 18:33:53 +0200 | [diff] [blame] | 1596 | batadv_claim_free_ref(claim); |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1597 | return ret; |
| 1598 | } |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1599 | |
Sven Eckelmann | 08adf15 | 2012-05-12 13:38:47 +0200 | [diff] [blame] | 1600 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1601 | { |
| 1602 | struct net_device *net_dev = (struct net_device *)seq->private; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1603 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1604 | struct batadv_hashtable *hash = bat_priv->bla.claim_hash; |
Marek Lindner | 712bbfe4 | 2012-12-25 17:03:25 +0800 | [diff] [blame] | 1605 | struct batadv_bla_claim *claim; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1606 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1607 | struct hlist_head *head; |
| 1608 | uint32_t i; |
| 1609 | bool is_own; |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1610 | uint8_t *primary_addr; |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1611 | |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 1612 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 1613 | if (!primary_if) |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1614 | goto out; |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1615 | |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1616 | primary_addr = primary_if->net_dev->dev_addr; |
Simon Wunderlich | 38ef3d1 | 2012-01-22 20:00:26 +0100 | [diff] [blame] | 1617 | seq_printf(seq, |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 1618 | "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n", |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1619 | net_dev->name, primary_addr, |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1620 | ntohs(bat_priv->bla.claim_dest.group)); |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 1621 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1622 | "Client", "VID", "Originator", "CRC"); |
| 1623 | for (i = 0; i < hash->size; i++) { |
| 1624 | head = &hash->table[i]; |
| 1625 | |
| 1626 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1627 | hlist_for_each_entry_rcu(claim, head, hash_entry) { |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 1628 | is_own = batadv_compare_eth(claim->backbone_gw->orig, |
| 1629 | primary_addr); |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 1630 | seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 1631 | claim->addr, BATADV_PRINT_VID(claim->vid), |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1632 | claim->backbone_gw->orig, |
| 1633 | (is_own ? 'x' : ' '), |
| 1634 | claim->backbone_gw->crc); |
| 1635 | } |
| 1636 | rcu_read_unlock(); |
| 1637 | } |
| 1638 | out: |
| 1639 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 1640 | batadv_hardif_free_ref(primary_if); |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 1641 | return 0; |
Simon Wunderlich | 9bf8e4d | 2012-01-22 20:00:21 +0100 | [diff] [blame] | 1642 | } |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1643 | |
| 1644 | int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) |
| 1645 | { |
| 1646 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 1647 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1648 | struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; |
Marek Lindner | bae9877 | 2012-12-25 17:03:24 +0800 | [diff] [blame] | 1649 | struct batadv_bla_backbone_gw *backbone_gw; |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1650 | struct batadv_hard_iface *primary_if; |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1651 | struct hlist_head *head; |
| 1652 | int secs, msecs; |
| 1653 | uint32_t i; |
| 1654 | bool is_own; |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1655 | uint8_t *primary_addr; |
| 1656 | |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 1657 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 1658 | if (!primary_if) |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1659 | goto out; |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1660 | |
| 1661 | primary_addr = primary_if->net_dev->dev_addr; |
| 1662 | seq_printf(seq, |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 1663 | "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n", |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1664 | net_dev->name, primary_addr, |
Sven Eckelmann | 807736f | 2012-07-15 22:26:51 +0200 | [diff] [blame] | 1665 | ntohs(bat_priv->bla.claim_dest.group)); |
Antonio Quartulli | 39a3299 | 2012-11-19 09:01:43 +0100 | [diff] [blame] | 1666 | seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1667 | "Originator", "VID", "last seen", "CRC"); |
| 1668 | for (i = 0; i < hash->size; i++) { |
| 1669 | head = &hash->table[i]; |
| 1670 | |
| 1671 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1672 | hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1673 | msecs = jiffies_to_msecs(jiffies - |
| 1674 | backbone_gw->lasttime); |
| 1675 | secs = msecs / 1000; |
| 1676 | msecs = msecs % 1000; |
| 1677 | |
| 1678 | is_own = batadv_compare_eth(backbone_gw->orig, |
| 1679 | primary_addr); |
| 1680 | if (is_own) |
| 1681 | continue; |
| 1682 | |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 1683 | seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n", |
Antonio Quartulli | 5f80df6 | 2013-04-19 18:07:01 +0200 | [diff] [blame] | 1684 | backbone_gw->orig, |
| 1685 | BATADV_PRINT_VID(backbone_gw->vid), secs, |
Antonio Quartulli | eb2deb6 | 2013-04-19 18:07:00 +0200 | [diff] [blame] | 1686 | msecs, backbone_gw->crc); |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1687 | } |
| 1688 | rcu_read_unlock(); |
| 1689 | } |
| 1690 | out: |
| 1691 | if (primary_if) |
| 1692 | batadv_hardif_free_ref(primary_if); |
Marek Lindner | 30da63a | 2012-08-03 17:15:46 +0200 | [diff] [blame] | 1693 | return 0; |
Simon Wunderlich | 536a23f | 2012-06-18 18:39:26 +0200 | [diff] [blame] | 1694 | } |