Simon Wunderlich | e19f975 | 2014-01-04 18:04:25 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2011-2014 B.A.T.M.A.N. contributors: |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 2 | * |
| 3 | * Antonio Quartulli |
| 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 |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | #include <linux/if_ether.h> |
| 19 | #include <linux/if_arp.h> |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 20 | #include <linux/if_vlan.h> |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 21 | #include <net/arp.h> |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 22 | |
| 23 | #include "main.h" |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 24 | #include "hash.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 25 | #include "distributed-arp-table.h" |
| 26 | #include "hard-interface.h" |
| 27 | #include "originator.h" |
| 28 | #include "send.h" |
| 29 | #include "types.h" |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 30 | #include "translation-table.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 31 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 32 | static void batadv_dat_purge(struct work_struct *work); |
| 33 | |
| 34 | /** |
| 35 | * batadv_dat_start_timer - initialise the DAT periodic worker |
| 36 | * @bat_priv: the bat priv with all the soft interface information |
| 37 | */ |
| 38 | static void batadv_dat_start_timer(struct batadv_priv *bat_priv) |
| 39 | { |
| 40 | INIT_DELAYED_WORK(&bat_priv->dat.work, batadv_dat_purge); |
| 41 | queue_delayed_work(batadv_event_workqueue, &bat_priv->dat.work, |
| 42 | msecs_to_jiffies(10000)); |
| 43 | } |
| 44 | |
| 45 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 46 | * batadv_dat_entry_free_ref - decrement the dat_entry refcounter and possibly |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 47 | * free it |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 48 | * @dat_entry: the entry to free |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 49 | */ |
| 50 | static void batadv_dat_entry_free_ref(struct batadv_dat_entry *dat_entry) |
| 51 | { |
| 52 | if (atomic_dec_and_test(&dat_entry->refcount)) |
| 53 | kfree_rcu(dat_entry, rcu); |
| 54 | } |
| 55 | |
| 56 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 57 | * batadv_dat_to_purge - check whether a dat_entry has to be purged or not |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 58 | * @dat_entry: the entry to check |
| 59 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 60 | * Returns true if the entry has to be purged now, false otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 61 | */ |
| 62 | static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) |
| 63 | { |
| 64 | return batadv_has_timed_out(dat_entry->last_update, |
| 65 | BATADV_DAT_ENTRY_TIMEOUT); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * __batadv_dat_purge - delete entries from the DAT local storage |
| 70 | * @bat_priv: the bat priv with all the soft interface information |
| 71 | * @to_purge: function in charge to decide whether an entry has to be purged or |
| 72 | * not. This function takes the dat_entry as argument and has to |
| 73 | * returns a boolean value: true is the entry has to be deleted, |
| 74 | * false otherwise |
| 75 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 76 | * Loops over each entry in the DAT local storage and deletes it if and only if |
| 77 | * the to_purge function passed as argument returns true. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 78 | */ |
| 79 | static void __batadv_dat_purge(struct batadv_priv *bat_priv, |
| 80 | bool (*to_purge)(struct batadv_dat_entry *)) |
| 81 | { |
| 82 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 83 | struct batadv_dat_entry *dat_entry; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 84 | struct hlist_node *node_tmp; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 85 | struct hlist_head *head; |
| 86 | uint32_t i; |
| 87 | |
| 88 | if (!bat_priv->dat.hash) |
| 89 | return; |
| 90 | |
| 91 | for (i = 0; i < bat_priv->dat.hash->size; i++) { |
| 92 | head = &bat_priv->dat.hash->table[i]; |
| 93 | list_lock = &bat_priv->dat.hash->list_locks[i]; |
| 94 | |
| 95 | spin_lock_bh(list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 96 | hlist_for_each_entry_safe(dat_entry, node_tmp, head, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 97 | hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 98 | /* if a helper function has been passed as parameter, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 99 | * ask it if the entry has to be purged or not |
| 100 | */ |
| 101 | if (to_purge && !to_purge(dat_entry)) |
| 102 | continue; |
| 103 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 104 | hlist_del_rcu(&dat_entry->hash_entry); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 105 | batadv_dat_entry_free_ref(dat_entry); |
| 106 | } |
| 107 | spin_unlock_bh(list_lock); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * batadv_dat_purge - periodic task that deletes old entries from the local DAT |
| 113 | * hash table |
| 114 | * @work: kernel work struct |
| 115 | */ |
| 116 | static void batadv_dat_purge(struct work_struct *work) |
| 117 | { |
| 118 | struct delayed_work *delayed_work; |
| 119 | struct batadv_priv_dat *priv_dat; |
| 120 | struct batadv_priv *bat_priv; |
| 121 | |
| 122 | delayed_work = container_of(work, struct delayed_work, work); |
| 123 | priv_dat = container_of(delayed_work, struct batadv_priv_dat, work); |
| 124 | bat_priv = container_of(priv_dat, struct batadv_priv, dat); |
| 125 | |
| 126 | __batadv_dat_purge(bat_priv, batadv_dat_to_purge); |
| 127 | batadv_dat_start_timer(bat_priv); |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * batadv_compare_dat - comparing function used in the local DAT hash table |
| 132 | * @node: node in the local table |
| 133 | * @data2: second object to compare the node to |
| 134 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 135 | * Returns 1 if the two entries are the same, 0 otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 136 | */ |
| 137 | static int batadv_compare_dat(const struct hlist_node *node, const void *data2) |
| 138 | { |
| 139 | const void *data1 = container_of(node, struct batadv_dat_entry, |
| 140 | hash_entry); |
| 141 | |
Antonio Quartulli | 36484f8 | 2013-11-07 08:02:07 +0100 | [diff] [blame] | 142 | return memcmp(data1, data2, sizeof(__be32)) == 0 ? 1 : 0; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 143 | } |
| 144 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 145 | /** |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 146 | * batadv_arp_hw_src - extract the hw_src field from an ARP packet |
| 147 | * @skb: ARP packet |
| 148 | * @hdr_size: size of the possible header before the ARP packet |
| 149 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 150 | * Returns the value of the hw_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 151 | */ |
| 152 | static uint8_t *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) |
| 153 | { |
| 154 | uint8_t *addr; |
| 155 | |
| 156 | addr = (uint8_t *)(skb->data + hdr_size); |
| 157 | addr += ETH_HLEN + sizeof(struct arphdr); |
| 158 | |
| 159 | return addr; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * batadv_arp_ip_src - extract the ip_src field from an ARP packet |
| 164 | * @skb: ARP packet |
| 165 | * @hdr_size: size of the possible header before the ARP packet |
| 166 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 167 | * Returns the value of the ip_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 168 | */ |
| 169 | static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) |
| 170 | { |
| 171 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * batadv_arp_hw_dst - extract the hw_dst field from an ARP packet |
| 176 | * @skb: ARP packet |
| 177 | * @hdr_size: size of the possible header before the ARP packet |
| 178 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 179 | * Returns the value of the hw_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 180 | */ |
| 181 | static uint8_t *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) |
| 182 | { |
| 183 | return batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN + 4; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * batadv_arp_ip_dst - extract the ip_dst field from an ARP packet |
| 188 | * @skb: ARP packet |
| 189 | * @hdr_size: size of the possible header before the ARP packet |
| 190 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 191 | * Returns the value of the ip_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 192 | */ |
| 193 | static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) |
| 194 | { |
| 195 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4); |
| 196 | } |
| 197 | |
| 198 | /** |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 199 | * batadv_hash_dat - compute the hash value for an IP address |
| 200 | * @data: data to hash |
| 201 | * @size: size of the hash table |
| 202 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 203 | * Returns the selected index in the hash table for the given data. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 204 | */ |
| 205 | static uint32_t batadv_hash_dat(const void *data, uint32_t size) |
| 206 | { |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 207 | uint32_t hash = 0; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 208 | const struct batadv_dat_entry *dat = data; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 209 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 210 | hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip)); |
| 211 | hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid)); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 212 | |
| 213 | hash += (hash << 3); |
| 214 | hash ^= (hash >> 11); |
| 215 | hash += (hash << 15); |
| 216 | |
| 217 | return hash % size; |
| 218 | } |
| 219 | |
| 220 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 221 | * batadv_dat_entry_hash_find - look for a given dat_entry in the local hash |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 222 | * table |
| 223 | * @bat_priv: the bat priv with all the soft interface information |
| 224 | * @ip: search key |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 225 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 226 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 227 | * Returns the dat_entry if found, NULL otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 228 | */ |
| 229 | static struct batadv_dat_entry * |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 230 | batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, |
| 231 | unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 232 | { |
| 233 | struct hlist_head *head; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 234 | struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 235 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
| 236 | uint32_t index; |
| 237 | |
| 238 | if (!hash) |
| 239 | return NULL; |
| 240 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 241 | to_find.ip = ip; |
| 242 | to_find.vid = vid; |
| 243 | |
| 244 | index = batadv_hash_dat(&to_find, hash->size); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 245 | head = &hash->table[index]; |
| 246 | |
| 247 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 248 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 249 | if (dat_entry->ip != ip) |
| 250 | continue; |
| 251 | |
| 252 | if (!atomic_inc_not_zero(&dat_entry->refcount)) |
| 253 | continue; |
| 254 | |
| 255 | dat_entry_tmp = dat_entry; |
| 256 | break; |
| 257 | } |
| 258 | rcu_read_unlock(); |
| 259 | |
| 260 | return dat_entry_tmp; |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * batadv_dat_entry_add - add a new dat entry or update it if already exists |
| 265 | * @bat_priv: the bat priv with all the soft interface information |
| 266 | * @ip: ipv4 to add/edit |
| 267 | * @mac_addr: mac address to assign to the given ipv4 |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 268 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 269 | */ |
| 270 | static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 271 | uint8_t *mac_addr, unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 272 | { |
| 273 | struct batadv_dat_entry *dat_entry; |
| 274 | int hash_added; |
| 275 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 276 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 277 | /* if this entry is already known, just update it */ |
| 278 | if (dat_entry) { |
| 279 | if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr)) |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame^] | 280 | ether_addr_copy(dat_entry->mac_addr, mac_addr); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 281 | dat_entry->last_update = jiffies; |
| 282 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 283 | "Entry updated: %pI4 %pM (vid: %d)\n", |
| 284 | &dat_entry->ip, dat_entry->mac_addr, |
| 285 | BATADV_PRINT_VID(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 286 | goto out; |
| 287 | } |
| 288 | |
| 289 | dat_entry = kmalloc(sizeof(*dat_entry), GFP_ATOMIC); |
| 290 | if (!dat_entry) |
| 291 | goto out; |
| 292 | |
| 293 | dat_entry->ip = ip; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 294 | dat_entry->vid = vid; |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame^] | 295 | ether_addr_copy(dat_entry->mac_addr, mac_addr); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 296 | dat_entry->last_update = jiffies; |
| 297 | atomic_set(&dat_entry->refcount, 2); |
| 298 | |
| 299 | hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 300 | batadv_hash_dat, dat_entry, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 301 | &dat_entry->hash_entry); |
| 302 | |
| 303 | if (unlikely(hash_added != 0)) { |
| 304 | /* remove the reference for the hash */ |
| 305 | batadv_dat_entry_free_ref(dat_entry); |
| 306 | goto out; |
| 307 | } |
| 308 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 309 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %d)\n", |
| 310 | &dat_entry->ip, dat_entry->mac_addr, BATADV_PRINT_VID(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 311 | |
| 312 | out: |
| 313 | if (dat_entry) |
| 314 | batadv_dat_entry_free_ref(dat_entry); |
| 315 | } |
| 316 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 317 | #ifdef CONFIG_BATMAN_ADV_DEBUG |
| 318 | |
| 319 | /** |
| 320 | * batadv_dbg_arp - print a debug message containing all the ARP packet details |
| 321 | * @bat_priv: the bat priv with all the soft interface information |
| 322 | * @skb: ARP packet |
| 323 | * @type: ARP type |
| 324 | * @hdr_size: size of the possible header before the ARP packet |
| 325 | * @msg: message to print together with the debugging information |
| 326 | */ |
| 327 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 328 | uint16_t type, int hdr_size, char *msg) |
| 329 | { |
| 330 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
| 331 | struct batadv_bcast_packet *bcast_pkt; |
| 332 | uint8_t *orig_addr; |
| 333 | __be32 ip_src, ip_dst; |
| 334 | |
| 335 | if (msg) |
| 336 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "%s\n", msg); |
| 337 | |
| 338 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 339 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 340 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 341 | "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n", |
| 342 | batadv_arp_hw_src(skb, hdr_size), &ip_src, |
| 343 | batadv_arp_hw_dst(skb, hdr_size), &ip_dst); |
| 344 | |
| 345 | if (hdr_size == 0) |
| 346 | return; |
| 347 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 348 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
| 349 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 350 | switch (unicast_4addr_packet->u.packet_type) { |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 351 | case BATADV_UNICAST: |
| 352 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 353 | "* encapsulated within a UNICAST packet\n"); |
| 354 | break; |
| 355 | case BATADV_UNICAST_4ADDR: |
| 356 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 357 | "* encapsulated within a UNICAST_4ADDR packet (src: %pM)\n", |
| 358 | unicast_4addr_packet->src); |
| 359 | switch (unicast_4addr_packet->subtype) { |
| 360 | case BATADV_P_DAT_DHT_PUT: |
| 361 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_PUT\n"); |
| 362 | break; |
| 363 | case BATADV_P_DAT_DHT_GET: |
| 364 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_GET\n"); |
| 365 | break; |
| 366 | case BATADV_P_DAT_CACHE_REPLY: |
| 367 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 368 | "* type: DAT_CACHE_REPLY\n"); |
| 369 | break; |
| 370 | case BATADV_P_DATA: |
| 371 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DATA\n"); |
| 372 | break; |
| 373 | default: |
| 374 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: Unknown (%u)!\n", |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 375 | unicast_4addr_packet->u.packet_type); |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 376 | } |
| 377 | break; |
| 378 | case BATADV_BCAST: |
| 379 | bcast_pkt = (struct batadv_bcast_packet *)unicast_4addr_packet; |
| 380 | orig_addr = bcast_pkt->orig; |
| 381 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 382 | "* encapsulated within a BCAST packet (src: %pM)\n", |
| 383 | orig_addr); |
| 384 | break; |
| 385 | default: |
| 386 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 387 | "* encapsulated within an unknown packet type (0x%x)\n", |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 388 | unicast_4addr_packet->u.packet_type); |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 389 | } |
| 390 | } |
| 391 | |
| 392 | #else |
| 393 | |
| 394 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 395 | uint16_t type, int hdr_size, char *msg) |
| 396 | { |
| 397 | } |
| 398 | |
| 399 | #endif /* CONFIG_BATMAN_ADV_DEBUG */ |
| 400 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 401 | /** |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 402 | * batadv_is_orig_node_eligible - check whether a node can be a DHT candidate |
| 403 | * @res: the array with the already selected candidates |
| 404 | * @select: number of already selected candidates |
| 405 | * @tmp_max: address of the currently evaluated node |
| 406 | * @max: current round max address |
| 407 | * @last_max: address of the last selected candidate |
| 408 | * @candidate: orig_node under evaluation |
| 409 | * @max_orig_node: last selected candidate |
| 410 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 411 | * Returns true if the node has been elected as next candidate or false |
| 412 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 413 | */ |
| 414 | static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, |
| 415 | int select, batadv_dat_addr_t tmp_max, |
| 416 | batadv_dat_addr_t max, |
| 417 | batadv_dat_addr_t last_max, |
| 418 | struct batadv_orig_node *candidate, |
| 419 | struct batadv_orig_node *max_orig_node) |
| 420 | { |
| 421 | bool ret = false; |
| 422 | int j; |
| 423 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 424 | /* check if orig node candidate is running DAT */ |
| 425 | if (!(candidate->capabilities & BATADV_ORIG_CAPA_HAS_DAT)) |
| 426 | goto out; |
| 427 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 428 | /* Check if this node has already been selected... */ |
| 429 | for (j = 0; j < select; j++) |
| 430 | if (res[j].orig_node == candidate) |
| 431 | break; |
| 432 | /* ..and possibly skip it */ |
| 433 | if (j < select) |
| 434 | goto out; |
| 435 | /* sanity check: has it already been selected? This should not happen */ |
| 436 | if (tmp_max > last_max) |
| 437 | goto out; |
| 438 | /* check if during this iteration an originator with a closer dht |
| 439 | * address has already been found |
| 440 | */ |
| 441 | if (tmp_max < max) |
| 442 | goto out; |
| 443 | /* this is an hash collision with the temporary selected node. Choose |
| 444 | * the one with the lowest address |
| 445 | */ |
Pau Koning | 816cd5b | 2013-02-12 00:18:45 +0000 | [diff] [blame] | 446 | if ((tmp_max == max) && max_orig_node && |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 447 | (batadv_compare_eth(candidate->orig, max_orig_node->orig) > 0)) |
| 448 | goto out; |
| 449 | |
| 450 | ret = true; |
| 451 | out: |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * batadv_choose_next_candidate - select the next DHT candidate |
| 457 | * @bat_priv: the bat priv with all the soft interface information |
| 458 | * @cands: candidates array |
| 459 | * @select: number of candidates already present in the array |
| 460 | * @ip_key: key to look up in the DHT |
| 461 | * @last_max: pointer where the address of the selected candidate will be saved |
| 462 | */ |
| 463 | static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, |
| 464 | struct batadv_dat_candidate *cands, |
| 465 | int select, batadv_dat_addr_t ip_key, |
| 466 | batadv_dat_addr_t *last_max) |
| 467 | { |
| 468 | batadv_dat_addr_t max = 0, tmp_max = 0; |
| 469 | struct batadv_orig_node *orig_node, *max_orig_node = NULL; |
| 470 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 471 | struct hlist_head *head; |
| 472 | int i; |
| 473 | |
| 474 | /* if no node is eligible as candidate, leave the candidate type as |
| 475 | * NOT_FOUND |
| 476 | */ |
| 477 | cands[select].type = BATADV_DAT_CANDIDATE_NOT_FOUND; |
| 478 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 479 | /* iterate over the originator list and find the node with the closest |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 480 | * dat_address which has not been selected yet |
| 481 | */ |
| 482 | for (i = 0; i < hash->size; i++) { |
| 483 | head = &hash->table[i]; |
| 484 | |
| 485 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 486 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 487 | /* the dht space is a ring using unsigned addresses */ |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 488 | tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr + |
| 489 | ip_key; |
| 490 | |
| 491 | if (!batadv_is_orig_node_eligible(cands, select, |
| 492 | tmp_max, max, |
| 493 | *last_max, orig_node, |
| 494 | max_orig_node)) |
| 495 | continue; |
| 496 | |
| 497 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
| 498 | continue; |
| 499 | |
| 500 | max = tmp_max; |
| 501 | if (max_orig_node) |
| 502 | batadv_orig_node_free_ref(max_orig_node); |
| 503 | max_orig_node = orig_node; |
| 504 | } |
| 505 | rcu_read_unlock(); |
| 506 | } |
| 507 | if (max_orig_node) { |
| 508 | cands[select].type = BATADV_DAT_CANDIDATE_ORIG; |
| 509 | cands[select].orig_node = max_orig_node; |
| 510 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 511 | "dat_select_candidates() %d: selected %pM addr=%u dist=%u\n", |
| 512 | select, max_orig_node->orig, max_orig_node->dat_addr, |
| 513 | max); |
| 514 | } |
| 515 | *last_max = max; |
| 516 | } |
| 517 | |
| 518 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 519 | * batadv_dat_select_candidates - select the nodes which the DHT message has to |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 520 | * be sent to |
| 521 | * @bat_priv: the bat priv with all the soft interface information |
| 522 | * @ip_dst: ipv4 to look up in the DHT |
| 523 | * |
| 524 | * An originator O is selected if and only if its DHT_ID value is one of three |
| 525 | * closest values (from the LEFT, with wrap around if needed) then the hash |
| 526 | * value of the key. ip_dst is the key. |
| 527 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 528 | * Returns the candidate array of size BATADV_DAT_CANDIDATE_NUM. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 529 | */ |
| 530 | static struct batadv_dat_candidate * |
| 531 | batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) |
| 532 | { |
| 533 | int select; |
| 534 | batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; |
| 535 | struct batadv_dat_candidate *res; |
| 536 | |
| 537 | if (!bat_priv->orig_hash) |
| 538 | return NULL; |
| 539 | |
| 540 | res = kmalloc(BATADV_DAT_CANDIDATES_NUM * sizeof(*res), GFP_ATOMIC); |
| 541 | if (!res) |
| 542 | return NULL; |
| 543 | |
| 544 | ip_key = (batadv_dat_addr_t)batadv_hash_dat(&ip_dst, |
| 545 | BATADV_DAT_ADDR_MAX); |
| 546 | |
| 547 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 548 | "dat_select_candidates(): IP=%pI4 hash(IP)=%u\n", &ip_dst, |
| 549 | ip_key); |
| 550 | |
| 551 | for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++) |
| 552 | batadv_choose_next_candidate(bat_priv, res, select, ip_key, |
| 553 | &last_max); |
| 554 | |
| 555 | return res; |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * batadv_dat_send_data - send a payload to the selected candidates |
| 560 | * @bat_priv: the bat priv with all the soft interface information |
| 561 | * @skb: payload to send |
| 562 | * @ip: the DHT key |
| 563 | * @packet_subtype: unicast4addr packet subtype to use |
| 564 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 565 | * This function copies the skb with pskb_copy() and is sent as unicast packet |
| 566 | * to each of the selected candidates. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 567 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 568 | * Returns true if the packet is sent to at least one candidate, false |
| 569 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 570 | */ |
| 571 | static bool batadv_dat_send_data(struct batadv_priv *bat_priv, |
| 572 | struct sk_buff *skb, __be32 ip, |
| 573 | int packet_subtype) |
| 574 | { |
| 575 | int i; |
| 576 | bool ret = false; |
| 577 | int send_status; |
| 578 | struct batadv_neigh_node *neigh_node = NULL; |
| 579 | struct sk_buff *tmp_skb; |
| 580 | struct batadv_dat_candidate *cand; |
| 581 | |
| 582 | cand = batadv_dat_select_candidates(bat_priv, ip); |
| 583 | if (!cand) |
| 584 | goto out; |
| 585 | |
| 586 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip); |
| 587 | |
| 588 | for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) { |
| 589 | if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND) |
| 590 | continue; |
| 591 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 592 | neigh_node = batadv_orig_router_get(cand[i].orig_node, |
| 593 | BATADV_IF_DEFAULT); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 594 | if (!neigh_node) |
| 595 | goto free_orig; |
| 596 | |
| 597 | tmp_skb = pskb_copy(skb, GFP_ATOMIC); |
Martin Hundebøll | f097e25 | 2013-05-23 16:53:01 +0200 | [diff] [blame] | 598 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb, |
| 599 | cand[i].orig_node, |
| 600 | packet_subtype)) { |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 601 | kfree_skb(tmp_skb); |
| 602 | goto free_neigh; |
| 603 | } |
| 604 | |
| 605 | send_status = batadv_send_skb_packet(tmp_skb, |
| 606 | neigh_node->if_incoming, |
| 607 | neigh_node->addr); |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 608 | if (send_status == NET_XMIT_SUCCESS) { |
| 609 | /* count the sent packet */ |
| 610 | switch (packet_subtype) { |
| 611 | case BATADV_P_DAT_DHT_GET: |
| 612 | batadv_inc_counter(bat_priv, |
| 613 | BATADV_CNT_DAT_GET_TX); |
| 614 | break; |
| 615 | case BATADV_P_DAT_DHT_PUT: |
| 616 | batadv_inc_counter(bat_priv, |
| 617 | BATADV_CNT_DAT_PUT_TX); |
| 618 | break; |
| 619 | } |
| 620 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 621 | /* packet sent to a candidate: return true */ |
| 622 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 623 | } |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 624 | free_neigh: |
| 625 | batadv_neigh_node_free_ref(neigh_node); |
| 626 | free_orig: |
| 627 | batadv_orig_node_free_ref(cand[i].orig_node); |
| 628 | } |
| 629 | |
| 630 | out: |
| 631 | kfree(cand); |
| 632 | return ret; |
| 633 | } |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 634 | |
| 635 | /** |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 636 | * batadv_dat_tvlv_container_update - update the dat tvlv container after dat |
| 637 | * setting change |
| 638 | * @bat_priv: the bat priv with all the soft interface information |
| 639 | */ |
| 640 | static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv) |
| 641 | { |
| 642 | char dat_mode; |
| 643 | |
| 644 | dat_mode = atomic_read(&bat_priv->distributed_arp_table); |
| 645 | |
| 646 | switch (dat_mode) { |
| 647 | case 0: |
| 648 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 649 | break; |
| 650 | case 1: |
| 651 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_DAT, 1, |
| 652 | NULL, 0); |
| 653 | break; |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | /** |
| 658 | * batadv_dat_status_update - update the dat tvlv container after dat |
| 659 | * setting change |
| 660 | * @net_dev: the soft interface net device |
| 661 | */ |
| 662 | void batadv_dat_status_update(struct net_device *net_dev) |
| 663 | { |
| 664 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 665 | batadv_dat_tvlv_container_update(bat_priv); |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * batadv_gw_tvlv_ogm_handler_v1 - process incoming dat tvlv container |
| 670 | * @bat_priv: the bat priv with all the soft interface information |
| 671 | * @orig: the orig_node of the ogm |
| 672 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) |
| 673 | * @tvlv_value: tvlv buffer containing the gateway data |
| 674 | * @tvlv_value_len: tvlv buffer length |
| 675 | */ |
| 676 | static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, |
| 677 | struct batadv_orig_node *orig, |
| 678 | uint8_t flags, |
| 679 | void *tvlv_value, |
| 680 | uint16_t tvlv_value_len) |
| 681 | { |
| 682 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) |
| 683 | orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_DAT; |
| 684 | else |
| 685 | orig->capabilities |= BATADV_ORIG_CAPA_HAS_DAT; |
| 686 | } |
| 687 | |
| 688 | /** |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 689 | * batadv_dat_hash_free - free the local DAT hash table |
| 690 | * @bat_priv: the bat priv with all the soft interface information |
| 691 | */ |
| 692 | static void batadv_dat_hash_free(struct batadv_priv *bat_priv) |
| 693 | { |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 694 | if (!bat_priv->dat.hash) |
| 695 | return; |
| 696 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 697 | __batadv_dat_purge(bat_priv, NULL); |
| 698 | |
| 699 | batadv_hash_destroy(bat_priv->dat.hash); |
| 700 | |
| 701 | bat_priv->dat.hash = NULL; |
| 702 | } |
| 703 | |
| 704 | /** |
| 705 | * batadv_dat_init - initialise the DAT internals |
| 706 | * @bat_priv: the bat priv with all the soft interface information |
| 707 | */ |
| 708 | int batadv_dat_init(struct batadv_priv *bat_priv) |
| 709 | { |
| 710 | if (bat_priv->dat.hash) |
| 711 | return 0; |
| 712 | |
| 713 | bat_priv->dat.hash = batadv_hash_new(1024); |
| 714 | |
| 715 | if (!bat_priv->dat.hash) |
| 716 | return -ENOMEM; |
| 717 | |
| 718 | batadv_dat_start_timer(bat_priv); |
| 719 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 720 | batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1, |
| 721 | NULL, BATADV_TVLV_DAT, 1, |
| 722 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
| 723 | batadv_dat_tvlv_container_update(bat_priv); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | /** |
| 728 | * batadv_dat_free - free the DAT internals |
| 729 | * @bat_priv: the bat priv with all the soft interface information |
| 730 | */ |
| 731 | void batadv_dat_free(struct batadv_priv *bat_priv) |
| 732 | { |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 733 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 734 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 735 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 736 | cancel_delayed_work_sync(&bat_priv->dat.work); |
| 737 | |
| 738 | batadv_dat_hash_free(bat_priv); |
| 739 | } |
| 740 | |
| 741 | /** |
| 742 | * batadv_dat_cache_seq_print_text - print the local DAT hash table |
| 743 | * @seq: seq file to print on |
| 744 | * @offset: not used |
| 745 | */ |
| 746 | int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) |
| 747 | { |
| 748 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 749 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 750 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
| 751 | struct batadv_dat_entry *dat_entry; |
| 752 | struct batadv_hard_iface *primary_if; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 753 | struct hlist_head *head; |
| 754 | unsigned long last_seen_jiffies; |
| 755 | int last_seen_msecs, last_seen_secs, last_seen_mins; |
| 756 | uint32_t i; |
| 757 | |
| 758 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 759 | if (!primary_if) |
| 760 | goto out; |
| 761 | |
| 762 | seq_printf(seq, "Distributed ARP Table (%s):\n", net_dev->name); |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 763 | seq_printf(seq, " %-7s %-9s %4s %11s\n", "IPv4", |
| 764 | "MAC", "VID", "last-seen"); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 765 | |
| 766 | for (i = 0; i < hash->size; i++) { |
| 767 | head = &hash->table[i]; |
| 768 | |
| 769 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 770 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 771 | last_seen_jiffies = jiffies - dat_entry->last_update; |
| 772 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); |
| 773 | last_seen_mins = last_seen_msecs / 60000; |
| 774 | last_seen_msecs = last_seen_msecs % 60000; |
| 775 | last_seen_secs = last_seen_msecs / 1000; |
| 776 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 777 | seq_printf(seq, " * %15pI4 %14pM %4i %6i:%02i\n", |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 778 | &dat_entry->ip, dat_entry->mac_addr, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 779 | BATADV_PRINT_VID(dat_entry->vid), |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 780 | last_seen_mins, last_seen_secs); |
| 781 | } |
| 782 | rcu_read_unlock(); |
| 783 | } |
| 784 | |
| 785 | out: |
| 786 | if (primary_if) |
| 787 | batadv_hardif_free_ref(primary_if); |
| 788 | return 0; |
| 789 | } |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 790 | |
| 791 | /** |
| 792 | * batadv_arp_get_type - parse an ARP packet and gets the type |
| 793 | * @bat_priv: the bat priv with all the soft interface information |
| 794 | * @skb: packet to analyse |
| 795 | * @hdr_size: size of the possible header before the ARP packet in the skb |
| 796 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 797 | * Returns the ARP type if the skb contains a valid ARP packet, 0 otherwise. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 798 | */ |
| 799 | static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv, |
| 800 | struct sk_buff *skb, int hdr_size) |
| 801 | { |
| 802 | struct arphdr *arphdr; |
| 803 | struct ethhdr *ethhdr; |
| 804 | __be32 ip_src, ip_dst; |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 805 | uint8_t *hw_src, *hw_dst; |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 806 | uint16_t type = 0; |
| 807 | |
| 808 | /* pull the ethernet header */ |
| 809 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN))) |
| 810 | goto out; |
| 811 | |
| 812 | ethhdr = (struct ethhdr *)(skb->data + hdr_size); |
| 813 | |
| 814 | if (ethhdr->h_proto != htons(ETH_P_ARP)) |
| 815 | goto out; |
| 816 | |
| 817 | /* pull the ARP payload */ |
| 818 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN + |
| 819 | arp_hdr_len(skb->dev)))) |
| 820 | goto out; |
| 821 | |
| 822 | arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN); |
| 823 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 824 | /* check whether the ARP packet carries a valid IP information */ |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 825 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
| 826 | goto out; |
| 827 | |
| 828 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
| 829 | goto out; |
| 830 | |
| 831 | if (arphdr->ar_hln != ETH_ALEN) |
| 832 | goto out; |
| 833 | |
| 834 | if (arphdr->ar_pln != 4) |
| 835 | goto out; |
| 836 | |
| 837 | /* Check for bad reply/request. If the ARP message is not sane, DAT |
| 838 | * will simply ignore it |
| 839 | */ |
| 840 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 841 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 842 | if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) || |
Matthias Schiffer | 757dd82 | 2013-01-24 18:18:26 +0100 | [diff] [blame] | 843 | ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) || |
| 844 | ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) || |
| 845 | ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst)) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 846 | goto out; |
| 847 | |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 848 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 849 | if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src)) |
| 850 | goto out; |
| 851 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 852 | /* don't care about the destination MAC address in ARP requests */ |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 853 | if (arphdr->ar_op != htons(ARPOP_REQUEST)) { |
| 854 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 855 | if (is_zero_ether_addr(hw_dst) || |
| 856 | is_multicast_ether_addr(hw_dst)) |
| 857 | goto out; |
| 858 | } |
| 859 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 860 | type = ntohs(arphdr->ar_op); |
| 861 | out: |
| 862 | return type; |
| 863 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 864 | |
| 865 | /** |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 866 | * batadv_dat_get_vid - extract the VLAN identifier from skb if any |
| 867 | * @skb: the buffer containing the packet to extract the VID from |
| 868 | * @hdr_size: the size of the batman-adv header encapsulating the packet |
| 869 | * |
| 870 | * If the packet embedded in the skb is vlan tagged this function returns the |
| 871 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. |
| 872 | */ |
| 873 | static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) |
| 874 | { |
| 875 | unsigned short vid; |
| 876 | |
| 877 | vid = batadv_get_vid(skb, *hdr_size); |
| 878 | |
| 879 | /* ARP parsing functions jump forward of hdr_size + ETH_HLEN. |
| 880 | * If the header contained in the packet is a VLAN one (which is longer) |
| 881 | * hdr_size is updated so that the functions will still skip the |
| 882 | * correct amount of bytes. |
| 883 | */ |
| 884 | if (vid & BATADV_VLAN_HAS_TAG) |
| 885 | *hdr_size += VLAN_HLEN; |
| 886 | |
| 887 | return vid; |
| 888 | } |
| 889 | |
| 890 | /** |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 891 | * batadv_dat_snoop_outgoing_arp_request - snoop the ARP request and try to |
| 892 | * answer using DAT |
| 893 | * @bat_priv: the bat priv with all the soft interface information |
| 894 | * @skb: packet to check |
| 895 | * |
| 896 | * Returns true if the message has been sent to the dht candidates, false |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 897 | * otherwise. In case of a positive return value the message has to be enqueued |
| 898 | * to permit the fallback. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 899 | */ |
| 900 | bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, |
| 901 | struct sk_buff *skb) |
| 902 | { |
| 903 | uint16_t type = 0; |
| 904 | __be32 ip_dst, ip_src; |
| 905 | uint8_t *hw_src; |
| 906 | bool ret = false; |
| 907 | struct batadv_dat_entry *dat_entry = NULL; |
| 908 | struct sk_buff *skb_new; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 909 | int hdr_size = 0; |
| 910 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 911 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 912 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 913 | goto out; |
| 914 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 915 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 916 | |
| 917 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 918 | /* If the node gets an ARP_REQUEST it has to send a DHT_GET unicast |
| 919 | * message to the selected DHT candidates |
| 920 | */ |
| 921 | if (type != ARPOP_REQUEST) |
| 922 | goto out; |
| 923 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 924 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 925 | "Parsing outgoing ARP REQUEST"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 926 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 927 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 928 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 929 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 930 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 931 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 932 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 933 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 934 | if (dat_entry) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 935 | /* If the ARP request is destined for a local client the local |
| 936 | * client will answer itself. DAT would only generate a |
| 937 | * duplicate packet. |
| 938 | * |
| 939 | * Moreover, if the soft-interface is enslaved into a bridge, an |
| 940 | * additional DAT answer may trigger kernel warnings about |
| 941 | * a packet coming from the wrong port. |
| 942 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 943 | if (batadv_is_my_client(bat_priv, dat_entry->mac_addr, |
| 944 | BATADV_NO_FLAGS)) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 945 | ret = true; |
| 946 | goto out; |
| 947 | } |
| 948 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 949 | skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 950 | bat_priv->soft_iface, ip_dst, hw_src, |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 951 | dat_entry->mac_addr, hw_src); |
| 952 | if (!skb_new) |
| 953 | goto out; |
| 954 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 955 | if (vid & BATADV_VLAN_HAS_TAG) |
| 956 | skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), |
| 957 | vid & VLAN_VID_MASK); |
| 958 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 959 | skb_reset_mac_header(skb_new); |
| 960 | skb_new->protocol = eth_type_trans(skb_new, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 961 | bat_priv->soft_iface); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 962 | bat_priv->stats.rx_packets++; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 963 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN + hdr_size; |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 964 | bat_priv->soft_iface->last_rx = jiffies; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 965 | |
| 966 | netif_rx(skb_new); |
| 967 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n"); |
| 968 | ret = true; |
| 969 | } else { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 970 | /* Send the request to the DHT */ |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 971 | ret = batadv_dat_send_data(bat_priv, skb, ip_dst, |
| 972 | BATADV_P_DAT_DHT_GET); |
| 973 | } |
| 974 | out: |
| 975 | if (dat_entry) |
| 976 | batadv_dat_entry_free_ref(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 977 | return ret; |
| 978 | } |
| 979 | |
| 980 | /** |
| 981 | * batadv_dat_snoop_incoming_arp_request - snoop the ARP request and try to |
| 982 | * answer using the local DAT storage |
| 983 | * @bat_priv: the bat priv with all the soft interface information |
| 984 | * @skb: packet to check |
| 985 | * @hdr_size: size of the encapsulation header |
| 986 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 987 | * Returns true if the request has been answered, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 988 | */ |
| 989 | bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, |
| 990 | struct sk_buff *skb, int hdr_size) |
| 991 | { |
| 992 | uint16_t type; |
| 993 | __be32 ip_src, ip_dst; |
| 994 | uint8_t *hw_src; |
| 995 | struct sk_buff *skb_new; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 996 | struct batadv_dat_entry *dat_entry = NULL; |
| 997 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 998 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 999 | int err; |
| 1000 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1001 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1002 | goto out; |
| 1003 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1004 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1005 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1006 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1007 | if (type != ARPOP_REQUEST) |
| 1008 | goto out; |
| 1009 | |
| 1010 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1011 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1012 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1013 | |
| 1014 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1015 | "Parsing incoming ARP REQUEST"); |
| 1016 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1017 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1018 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1019 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1020 | if (!dat_entry) |
| 1021 | goto out; |
| 1022 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1023 | skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 1024 | bat_priv->soft_iface, ip_dst, hw_src, |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1025 | dat_entry->mac_addr, hw_src); |
| 1026 | |
| 1027 | if (!skb_new) |
| 1028 | goto out; |
| 1029 | |
Linus Lüssing | 927c2ed | 2014-01-19 22:22:45 +0100 | [diff] [blame] | 1030 | /* the rest of the TX path assumes that the mac_header offset pointing |
| 1031 | * to the inner Ethernet header has been set, therefore reset it now. |
| 1032 | */ |
| 1033 | skb_reset_mac_header(skb_new); |
| 1034 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1035 | if (vid & BATADV_VLAN_HAS_TAG) |
| 1036 | skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), |
| 1037 | vid & VLAN_VID_MASK); |
| 1038 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1039 | /* To preserve backwards compatibility, the node has choose the outgoing |
| 1040 | * format based on the incoming request packet type. The assumption is |
| 1041 | * that a node not using the 4addr packet format doesn't support it. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1042 | */ |
| 1043 | if (hdr_size == sizeof(struct batadv_unicast_4addr_packet)) |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame] | 1044 | err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new, |
| 1045 | BATADV_P_DAT_CACHE_REPLY, |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 1046 | NULL, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1047 | else |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 1048 | err = batadv_send_skb_via_tt(bat_priv, skb_new, NULL, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1049 | |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame] | 1050 | if (err != NET_XMIT_DROP) { |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1051 | batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1052 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1053 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1054 | out: |
| 1055 | if (dat_entry) |
| 1056 | batadv_dat_entry_free_ref(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1057 | if (ret) |
| 1058 | kfree_skb(skb); |
| 1059 | return ret; |
| 1060 | } |
| 1061 | |
| 1062 | /** |
| 1063 | * batadv_dat_snoop_outgoing_arp_reply - snoop the ARP reply and fill the DHT |
| 1064 | * @bat_priv: the bat priv with all the soft interface information |
| 1065 | * @skb: packet to check |
| 1066 | */ |
| 1067 | void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, |
| 1068 | struct sk_buff *skb) |
| 1069 | { |
| 1070 | uint16_t type; |
| 1071 | __be32 ip_src, ip_dst; |
| 1072 | uint8_t *hw_src, *hw_dst; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1073 | int hdr_size = 0; |
| 1074 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1075 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1076 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1077 | return; |
| 1078 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1079 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1080 | |
| 1081 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1082 | if (type != ARPOP_REPLY) |
| 1083 | return; |
| 1084 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1085 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1086 | "Parsing outgoing ARP REPLY"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1087 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1088 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1089 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1090 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1091 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1092 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1093 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1094 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1095 | |
| 1096 | /* Send the ARP reply to the candidates for both the IP addresses that |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1097 | * the node obtained from the ARP reply |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1098 | */ |
| 1099 | batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT); |
| 1100 | batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT); |
| 1101 | } |
| 1102 | /** |
| 1103 | * batadv_dat_snoop_incoming_arp_reply - snoop the ARP reply and fill the local |
| 1104 | * DAT storage only |
| 1105 | * @bat_priv: the bat priv with all the soft interface information |
| 1106 | * @skb: packet to check |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1107 | * @hdr_size: size of the encapsulation header |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1108 | */ |
| 1109 | bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, |
| 1110 | struct sk_buff *skb, int hdr_size) |
| 1111 | { |
| 1112 | uint16_t type; |
| 1113 | __be32 ip_src, ip_dst; |
| 1114 | uint8_t *hw_src, *hw_dst; |
| 1115 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1116 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1117 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1118 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1119 | goto out; |
| 1120 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1121 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1122 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1123 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1124 | if (type != ARPOP_REPLY) |
| 1125 | goto out; |
| 1126 | |
| 1127 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1128 | "Parsing incoming ARP REPLY"); |
| 1129 | |
| 1130 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1131 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1132 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1133 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1134 | |
| 1135 | /* Update our internal cache with both the IP addresses the node got |
| 1136 | * within the ARP reply |
| 1137 | */ |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1138 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1139 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1140 | |
| 1141 | /* if this REPLY is directed to a client of mine, let's deliver the |
| 1142 | * packet to the interface |
| 1143 | */ |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1144 | ret = !batadv_is_my_client(bat_priv, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1145 | out: |
Matthias Schiffer | 0d15bec | 2013-01-23 18:11:53 +0100 | [diff] [blame] | 1146 | if (ret) |
| 1147 | kfree_skb(skb); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1148 | /* if ret == false -> packet has to be delivered to the interface */ |
| 1149 | return ret; |
| 1150 | } |
| 1151 | |
| 1152 | /** |
| 1153 | * batadv_dat_drop_broadcast_packet - check if an ARP request has to be dropped |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1154 | * (because the node has already obtained the reply via DAT) or not |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1155 | * @bat_priv: the bat priv with all the soft interface information |
| 1156 | * @forw_packet: the broadcast packet |
| 1157 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1158 | * Returns true if the node can drop the packet, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1159 | */ |
| 1160 | bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, |
| 1161 | struct batadv_forw_packet *forw_packet) |
| 1162 | { |
| 1163 | uint16_t type; |
| 1164 | __be32 ip_dst; |
| 1165 | struct batadv_dat_entry *dat_entry = NULL; |
| 1166 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1167 | int hdr_size = sizeof(struct batadv_bcast_packet); |
| 1168 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1169 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1170 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1171 | goto out; |
| 1172 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1173 | /* If this packet is an ARP_REQUEST and the node already has the |
| 1174 | * information that it is going to ask, then the packet can be dropped |
| 1175 | */ |
| 1176 | if (forw_packet->num_packets) |
| 1177 | goto out; |
| 1178 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1179 | vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size); |
| 1180 | |
| 1181 | type = batadv_arp_get_type(bat_priv, forw_packet->skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1182 | if (type != ARPOP_REQUEST) |
| 1183 | goto out; |
| 1184 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1185 | ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size); |
| 1186 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1187 | /* check if the node already got this entry */ |
| 1188 | if (!dat_entry) { |
| 1189 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1190 | "ARP Request for %pI4: fallback\n", &ip_dst); |
| 1191 | goto out; |
| 1192 | } |
| 1193 | |
| 1194 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1195 | "ARP Request for %pI4: fallback prevented\n", &ip_dst); |
| 1196 | ret = true; |
| 1197 | |
| 1198 | out: |
| 1199 | if (dat_entry) |
| 1200 | batadv_dat_entry_free_ref(dat_entry); |
| 1201 | return ret; |
| 1202 | } |