Antonio Quartulli | 0b87393 | 2013-01-04 03:05:31 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2011-2013 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 |
| 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 |
| 18 | */ |
| 19 | |
| 20 | #include <linux/if_ether.h> |
| 21 | #include <linux/if_arp.h> |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 22 | #include <linux/if_vlan.h> |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 23 | #include <net/arp.h> |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 24 | |
| 25 | #include "main.h" |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 26 | #include "hash.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 27 | #include "distributed-arp-table.h" |
| 28 | #include "hard-interface.h" |
| 29 | #include "originator.h" |
| 30 | #include "send.h" |
| 31 | #include "types.h" |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 32 | #include "translation-table.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 33 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 34 | static void batadv_dat_purge(struct work_struct *work); |
| 35 | |
| 36 | /** |
| 37 | * batadv_dat_start_timer - initialise the DAT periodic worker |
| 38 | * @bat_priv: the bat priv with all the soft interface information |
| 39 | */ |
| 40 | static void batadv_dat_start_timer(struct batadv_priv *bat_priv) |
| 41 | { |
| 42 | INIT_DELAYED_WORK(&bat_priv->dat.work, batadv_dat_purge); |
| 43 | queue_delayed_work(batadv_event_workqueue, &bat_priv->dat.work, |
| 44 | msecs_to_jiffies(10000)); |
| 45 | } |
| 46 | |
| 47 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 48 | * batadv_dat_entry_free_ref - decrement the dat_entry refcounter and possibly |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 49 | * free it |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 50 | * @dat_entry: the entry to free |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 51 | */ |
| 52 | static void batadv_dat_entry_free_ref(struct batadv_dat_entry *dat_entry) |
| 53 | { |
| 54 | if (atomic_dec_and_test(&dat_entry->refcount)) |
| 55 | kfree_rcu(dat_entry, rcu); |
| 56 | } |
| 57 | |
| 58 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 59 | * 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] | 60 | * @dat_entry: the entry to check |
| 61 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 62 | * Returns true if the entry has to be purged now, false otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 63 | */ |
| 64 | static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) |
| 65 | { |
| 66 | return batadv_has_timed_out(dat_entry->last_update, |
| 67 | BATADV_DAT_ENTRY_TIMEOUT); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * __batadv_dat_purge - delete entries from the DAT local storage |
| 72 | * @bat_priv: the bat priv with all the soft interface information |
| 73 | * @to_purge: function in charge to decide whether an entry has to be purged or |
| 74 | * not. This function takes the dat_entry as argument and has to |
| 75 | * returns a boolean value: true is the entry has to be deleted, |
| 76 | * false otherwise |
| 77 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 78 | * Loops over each entry in the DAT local storage and deletes it if and only if |
| 79 | * the to_purge function passed as argument returns true. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 80 | */ |
| 81 | static void __batadv_dat_purge(struct batadv_priv *bat_priv, |
| 82 | bool (*to_purge)(struct batadv_dat_entry *)) |
| 83 | { |
| 84 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 85 | struct batadv_dat_entry *dat_entry; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 86 | struct hlist_node *node_tmp; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 87 | struct hlist_head *head; |
| 88 | uint32_t i; |
| 89 | |
| 90 | if (!bat_priv->dat.hash) |
| 91 | return; |
| 92 | |
| 93 | for (i = 0; i < bat_priv->dat.hash->size; i++) { |
| 94 | head = &bat_priv->dat.hash->table[i]; |
| 95 | list_lock = &bat_priv->dat.hash->list_locks[i]; |
| 96 | |
| 97 | spin_lock_bh(list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 98 | hlist_for_each_entry_safe(dat_entry, node_tmp, head, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 99 | hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 100 | /* if a helper function has been passed as parameter, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 101 | * ask it if the entry has to be purged or not |
| 102 | */ |
| 103 | if (to_purge && !to_purge(dat_entry)) |
| 104 | continue; |
| 105 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 106 | hlist_del_rcu(&dat_entry->hash_entry); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 107 | batadv_dat_entry_free_ref(dat_entry); |
| 108 | } |
| 109 | spin_unlock_bh(list_lock); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * batadv_dat_purge - periodic task that deletes old entries from the local DAT |
| 115 | * hash table |
| 116 | * @work: kernel work struct |
| 117 | */ |
| 118 | static void batadv_dat_purge(struct work_struct *work) |
| 119 | { |
| 120 | struct delayed_work *delayed_work; |
| 121 | struct batadv_priv_dat *priv_dat; |
| 122 | struct batadv_priv *bat_priv; |
| 123 | |
| 124 | delayed_work = container_of(work, struct delayed_work, work); |
| 125 | priv_dat = container_of(delayed_work, struct batadv_priv_dat, work); |
| 126 | bat_priv = container_of(priv_dat, struct batadv_priv, dat); |
| 127 | |
| 128 | __batadv_dat_purge(bat_priv, batadv_dat_to_purge); |
| 129 | batadv_dat_start_timer(bat_priv); |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * batadv_compare_dat - comparing function used in the local DAT hash table |
| 134 | * @node: node in the local table |
| 135 | * @data2: second object to compare the node to |
| 136 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 137 | * Returns 1 if the two entries are the same, 0 otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 138 | */ |
| 139 | static int batadv_compare_dat(const struct hlist_node *node, const void *data2) |
| 140 | { |
| 141 | const void *data1 = container_of(node, struct batadv_dat_entry, |
| 142 | hash_entry); |
| 143 | |
| 144 | return (memcmp(data1, data2, sizeof(__be32)) == 0 ? 1 : 0); |
| 145 | } |
| 146 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 147 | /** |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 148 | * batadv_arp_hw_src - extract the hw_src field from an ARP packet |
| 149 | * @skb: ARP packet |
| 150 | * @hdr_size: size of the possible header before the ARP packet |
| 151 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 152 | * Returns the value of the hw_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 153 | */ |
| 154 | static uint8_t *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) |
| 155 | { |
| 156 | uint8_t *addr; |
| 157 | |
| 158 | addr = (uint8_t *)(skb->data + hdr_size); |
| 159 | addr += ETH_HLEN + sizeof(struct arphdr); |
| 160 | |
| 161 | return addr; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * batadv_arp_ip_src - extract the ip_src field from an ARP packet |
| 166 | * @skb: ARP packet |
| 167 | * @hdr_size: size of the possible header before the ARP packet |
| 168 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 169 | * Returns the value of the ip_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 170 | */ |
| 171 | static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) |
| 172 | { |
| 173 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN); |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * batadv_arp_hw_dst - extract the hw_dst field from an ARP packet |
| 178 | * @skb: ARP packet |
| 179 | * @hdr_size: size of the possible header before the ARP packet |
| 180 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 181 | * Returns the value of the hw_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 182 | */ |
| 183 | static uint8_t *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) |
| 184 | { |
| 185 | return batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN + 4; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * batadv_arp_ip_dst - extract the ip_dst field from an ARP packet |
| 190 | * @skb: ARP packet |
| 191 | * @hdr_size: size of the possible header before the ARP packet |
| 192 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 193 | * Returns the value of the ip_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 194 | */ |
| 195 | static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) |
| 196 | { |
| 197 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4); |
| 198 | } |
| 199 | |
| 200 | /** |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 201 | * batadv_hash_dat - compute the hash value for an IP address |
| 202 | * @data: data to hash |
| 203 | * @size: size of the hash table |
| 204 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 205 | * Returns the selected index in the hash table for the given data. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 206 | */ |
| 207 | static uint32_t batadv_hash_dat(const void *data, uint32_t size) |
| 208 | { |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 209 | uint32_t hash = 0; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 210 | const struct batadv_dat_entry *dat = data; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 211 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 212 | hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip)); |
| 213 | hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid)); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 214 | |
| 215 | hash += (hash << 3); |
| 216 | hash ^= (hash >> 11); |
| 217 | hash += (hash << 15); |
| 218 | |
| 219 | return hash % size; |
| 220 | } |
| 221 | |
| 222 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 223 | * 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] | 224 | * table |
| 225 | * @bat_priv: the bat priv with all the soft interface information |
| 226 | * @ip: search key |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 227 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 228 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 229 | * Returns the dat_entry if found, NULL otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 230 | */ |
| 231 | static struct batadv_dat_entry * |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 232 | batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, |
| 233 | unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 234 | { |
| 235 | struct hlist_head *head; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 236 | struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 237 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
| 238 | uint32_t index; |
| 239 | |
| 240 | if (!hash) |
| 241 | return NULL; |
| 242 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 243 | to_find.ip = ip; |
| 244 | to_find.vid = vid; |
| 245 | |
| 246 | index = batadv_hash_dat(&to_find, hash->size); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 247 | head = &hash->table[index]; |
| 248 | |
| 249 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 250 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 251 | if (dat_entry->ip != ip) |
| 252 | continue; |
| 253 | |
| 254 | if (!atomic_inc_not_zero(&dat_entry->refcount)) |
| 255 | continue; |
| 256 | |
| 257 | dat_entry_tmp = dat_entry; |
| 258 | break; |
| 259 | } |
| 260 | rcu_read_unlock(); |
| 261 | |
| 262 | return dat_entry_tmp; |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * batadv_dat_entry_add - add a new dat entry or update it if already exists |
| 267 | * @bat_priv: the bat priv with all the soft interface information |
| 268 | * @ip: ipv4 to add/edit |
| 269 | * @mac_addr: mac address to assign to the given ipv4 |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 270 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 271 | */ |
| 272 | 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] | 273 | uint8_t *mac_addr, unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 274 | { |
| 275 | struct batadv_dat_entry *dat_entry; |
| 276 | int hash_added; |
| 277 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 278 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 279 | /* if this entry is already known, just update it */ |
| 280 | if (dat_entry) { |
| 281 | if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr)) |
| 282 | memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN); |
| 283 | dat_entry->last_update = jiffies; |
| 284 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 285 | "Entry updated: %pI4 %pM (vid: %d)\n", |
| 286 | &dat_entry->ip, dat_entry->mac_addr, |
| 287 | BATADV_PRINT_VID(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 288 | goto out; |
| 289 | } |
| 290 | |
| 291 | dat_entry = kmalloc(sizeof(*dat_entry), GFP_ATOMIC); |
| 292 | if (!dat_entry) |
| 293 | goto out; |
| 294 | |
| 295 | dat_entry->ip = ip; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 296 | dat_entry->vid = vid; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 297 | memcpy(dat_entry->mac_addr, mac_addr, ETH_ALEN); |
| 298 | dat_entry->last_update = jiffies; |
| 299 | atomic_set(&dat_entry->refcount, 2); |
| 300 | |
| 301 | hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 302 | batadv_hash_dat, dat_entry, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 303 | &dat_entry->hash_entry); |
| 304 | |
| 305 | if (unlikely(hash_added != 0)) { |
| 306 | /* remove the reference for the hash */ |
| 307 | batadv_dat_entry_free_ref(dat_entry); |
| 308 | goto out; |
| 309 | } |
| 310 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 311 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %d)\n", |
| 312 | &dat_entry->ip, dat_entry->mac_addr, BATADV_PRINT_VID(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 313 | |
| 314 | out: |
| 315 | if (dat_entry) |
| 316 | batadv_dat_entry_free_ref(dat_entry); |
| 317 | } |
| 318 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 319 | #ifdef CONFIG_BATMAN_ADV_DEBUG |
| 320 | |
| 321 | /** |
| 322 | * batadv_dbg_arp - print a debug message containing all the ARP packet details |
| 323 | * @bat_priv: the bat priv with all the soft interface information |
| 324 | * @skb: ARP packet |
| 325 | * @type: ARP type |
| 326 | * @hdr_size: size of the possible header before the ARP packet |
| 327 | * @msg: message to print together with the debugging information |
| 328 | */ |
| 329 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 330 | uint16_t type, int hdr_size, char *msg) |
| 331 | { |
| 332 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
| 333 | struct batadv_bcast_packet *bcast_pkt; |
| 334 | uint8_t *orig_addr; |
| 335 | __be32 ip_src, ip_dst; |
| 336 | |
| 337 | if (msg) |
| 338 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "%s\n", msg); |
| 339 | |
| 340 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 341 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 342 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 343 | "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n", |
| 344 | batadv_arp_hw_src(skb, hdr_size), &ip_src, |
| 345 | batadv_arp_hw_dst(skb, hdr_size), &ip_dst); |
| 346 | |
| 347 | if (hdr_size == 0) |
| 348 | return; |
| 349 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 350 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
| 351 | |
| 352 | switch (unicast_4addr_packet->u.header.packet_type) { |
| 353 | case BATADV_UNICAST: |
| 354 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 355 | "* encapsulated within a UNICAST packet\n"); |
| 356 | break; |
| 357 | case BATADV_UNICAST_4ADDR: |
| 358 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 359 | "* encapsulated within a UNICAST_4ADDR packet (src: %pM)\n", |
| 360 | unicast_4addr_packet->src); |
| 361 | switch (unicast_4addr_packet->subtype) { |
| 362 | case BATADV_P_DAT_DHT_PUT: |
| 363 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_PUT\n"); |
| 364 | break; |
| 365 | case BATADV_P_DAT_DHT_GET: |
| 366 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_GET\n"); |
| 367 | break; |
| 368 | case BATADV_P_DAT_CACHE_REPLY: |
| 369 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 370 | "* type: DAT_CACHE_REPLY\n"); |
| 371 | break; |
| 372 | case BATADV_P_DATA: |
| 373 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DATA\n"); |
| 374 | break; |
| 375 | default: |
| 376 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: Unknown (%u)!\n", |
| 377 | unicast_4addr_packet->u.header.packet_type); |
| 378 | } |
| 379 | break; |
| 380 | case BATADV_BCAST: |
| 381 | bcast_pkt = (struct batadv_bcast_packet *)unicast_4addr_packet; |
| 382 | orig_addr = bcast_pkt->orig; |
| 383 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 384 | "* encapsulated within a BCAST packet (src: %pM)\n", |
| 385 | orig_addr); |
| 386 | break; |
| 387 | default: |
| 388 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 389 | "* encapsulated within an unknown packet type (0x%x)\n", |
| 390 | unicast_4addr_packet->u.header.packet_type); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | #else |
| 395 | |
| 396 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
| 397 | uint16_t type, int hdr_size, char *msg) |
| 398 | { |
| 399 | } |
| 400 | |
| 401 | #endif /* CONFIG_BATMAN_ADV_DEBUG */ |
| 402 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 403 | /** |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 404 | * batadv_is_orig_node_eligible - check whether a node can be a DHT candidate |
| 405 | * @res: the array with the already selected candidates |
| 406 | * @select: number of already selected candidates |
| 407 | * @tmp_max: address of the currently evaluated node |
| 408 | * @max: current round max address |
| 409 | * @last_max: address of the last selected candidate |
| 410 | * @candidate: orig_node under evaluation |
| 411 | * @max_orig_node: last selected candidate |
| 412 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 413 | * Returns true if the node has been elected as next candidate or false |
| 414 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 415 | */ |
| 416 | static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, |
| 417 | int select, batadv_dat_addr_t tmp_max, |
| 418 | batadv_dat_addr_t max, |
| 419 | batadv_dat_addr_t last_max, |
| 420 | struct batadv_orig_node *candidate, |
| 421 | struct batadv_orig_node *max_orig_node) |
| 422 | { |
| 423 | bool ret = false; |
| 424 | int j; |
| 425 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 426 | /* check if orig node candidate is running DAT */ |
| 427 | if (!(candidate->capabilities & BATADV_ORIG_CAPA_HAS_DAT)) |
| 428 | goto out; |
| 429 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 430 | /* Check if this node has already been selected... */ |
| 431 | for (j = 0; j < select; j++) |
| 432 | if (res[j].orig_node == candidate) |
| 433 | break; |
| 434 | /* ..and possibly skip it */ |
| 435 | if (j < select) |
| 436 | goto out; |
| 437 | /* sanity check: has it already been selected? This should not happen */ |
| 438 | if (tmp_max > last_max) |
| 439 | goto out; |
| 440 | /* check if during this iteration an originator with a closer dht |
| 441 | * address has already been found |
| 442 | */ |
| 443 | if (tmp_max < max) |
| 444 | goto out; |
| 445 | /* this is an hash collision with the temporary selected node. Choose |
| 446 | * the one with the lowest address |
| 447 | */ |
Pau Koning | 816cd5b | 2013-02-12 00:18:45 +0000 | [diff] [blame] | 448 | if ((tmp_max == max) && max_orig_node && |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 449 | (batadv_compare_eth(candidate->orig, max_orig_node->orig) > 0)) |
| 450 | goto out; |
| 451 | |
| 452 | ret = true; |
| 453 | out: |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * batadv_choose_next_candidate - select the next DHT candidate |
| 459 | * @bat_priv: the bat priv with all the soft interface information |
| 460 | * @cands: candidates array |
| 461 | * @select: number of candidates already present in the array |
| 462 | * @ip_key: key to look up in the DHT |
| 463 | * @last_max: pointer where the address of the selected candidate will be saved |
| 464 | */ |
| 465 | static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, |
| 466 | struct batadv_dat_candidate *cands, |
| 467 | int select, batadv_dat_addr_t ip_key, |
| 468 | batadv_dat_addr_t *last_max) |
| 469 | { |
| 470 | batadv_dat_addr_t max = 0, tmp_max = 0; |
| 471 | struct batadv_orig_node *orig_node, *max_orig_node = NULL; |
| 472 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 473 | struct hlist_head *head; |
| 474 | int i; |
| 475 | |
| 476 | /* if no node is eligible as candidate, leave the candidate type as |
| 477 | * NOT_FOUND |
| 478 | */ |
| 479 | cands[select].type = BATADV_DAT_CANDIDATE_NOT_FOUND; |
| 480 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 481 | /* iterate over the originator list and find the node with the closest |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 482 | * dat_address which has not been selected yet |
| 483 | */ |
| 484 | for (i = 0; i < hash->size; i++) { |
| 485 | head = &hash->table[i]; |
| 486 | |
| 487 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 488 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 489 | /* the dht space is a ring using unsigned addresses */ |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 490 | tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr + |
| 491 | ip_key; |
| 492 | |
| 493 | if (!batadv_is_orig_node_eligible(cands, select, |
| 494 | tmp_max, max, |
| 495 | *last_max, orig_node, |
| 496 | max_orig_node)) |
| 497 | continue; |
| 498 | |
| 499 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
| 500 | continue; |
| 501 | |
| 502 | max = tmp_max; |
| 503 | if (max_orig_node) |
| 504 | batadv_orig_node_free_ref(max_orig_node); |
| 505 | max_orig_node = orig_node; |
| 506 | } |
| 507 | rcu_read_unlock(); |
| 508 | } |
| 509 | if (max_orig_node) { |
| 510 | cands[select].type = BATADV_DAT_CANDIDATE_ORIG; |
| 511 | cands[select].orig_node = max_orig_node; |
| 512 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 513 | "dat_select_candidates() %d: selected %pM addr=%u dist=%u\n", |
| 514 | select, max_orig_node->orig, max_orig_node->dat_addr, |
| 515 | max); |
| 516 | } |
| 517 | *last_max = max; |
| 518 | } |
| 519 | |
| 520 | /** |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 521 | * 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] | 522 | * be sent to |
| 523 | * @bat_priv: the bat priv with all the soft interface information |
| 524 | * @ip_dst: ipv4 to look up in the DHT |
| 525 | * |
| 526 | * An originator O is selected if and only if its DHT_ID value is one of three |
| 527 | * closest values (from the LEFT, with wrap around if needed) then the hash |
| 528 | * value of the key. ip_dst is the key. |
| 529 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 530 | * Returns the candidate array of size BATADV_DAT_CANDIDATE_NUM. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 531 | */ |
| 532 | static struct batadv_dat_candidate * |
| 533 | batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) |
| 534 | { |
| 535 | int select; |
| 536 | batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; |
| 537 | struct batadv_dat_candidate *res; |
| 538 | |
| 539 | if (!bat_priv->orig_hash) |
| 540 | return NULL; |
| 541 | |
| 542 | res = kmalloc(BATADV_DAT_CANDIDATES_NUM * sizeof(*res), GFP_ATOMIC); |
| 543 | if (!res) |
| 544 | return NULL; |
| 545 | |
| 546 | ip_key = (batadv_dat_addr_t)batadv_hash_dat(&ip_dst, |
| 547 | BATADV_DAT_ADDR_MAX); |
| 548 | |
| 549 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 550 | "dat_select_candidates(): IP=%pI4 hash(IP)=%u\n", &ip_dst, |
| 551 | ip_key); |
| 552 | |
| 553 | for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++) |
| 554 | batadv_choose_next_candidate(bat_priv, res, select, ip_key, |
| 555 | &last_max); |
| 556 | |
| 557 | return res; |
| 558 | } |
| 559 | |
| 560 | /** |
| 561 | * batadv_dat_send_data - send a payload to the selected candidates |
| 562 | * @bat_priv: the bat priv with all the soft interface information |
| 563 | * @skb: payload to send |
| 564 | * @ip: the DHT key |
| 565 | * @packet_subtype: unicast4addr packet subtype to use |
| 566 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 567 | * This function copies the skb with pskb_copy() and is sent as unicast packet |
| 568 | * to each of the selected candidates. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 569 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 570 | * Returns true if the packet is sent to at least one candidate, false |
| 571 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 572 | */ |
| 573 | static bool batadv_dat_send_data(struct batadv_priv *bat_priv, |
| 574 | struct sk_buff *skb, __be32 ip, |
| 575 | int packet_subtype) |
| 576 | { |
| 577 | int i; |
| 578 | bool ret = false; |
| 579 | int send_status; |
| 580 | struct batadv_neigh_node *neigh_node = NULL; |
| 581 | struct sk_buff *tmp_skb; |
| 582 | struct batadv_dat_candidate *cand; |
| 583 | |
| 584 | cand = batadv_dat_select_candidates(bat_priv, ip); |
| 585 | if (!cand) |
| 586 | goto out; |
| 587 | |
| 588 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip); |
| 589 | |
| 590 | for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) { |
| 591 | if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND) |
| 592 | continue; |
| 593 | |
| 594 | neigh_node = batadv_orig_node_get_router(cand[i].orig_node); |
| 595 | if (!neigh_node) |
| 596 | goto free_orig; |
| 597 | |
| 598 | tmp_skb = pskb_copy(skb, GFP_ATOMIC); |
Martin Hundebøll | f097e25 | 2013-05-23 16:53:01 +0200 | [diff] [blame] | 599 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb, |
| 600 | cand[i].orig_node, |
| 601 | packet_subtype)) { |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 602 | kfree_skb(tmp_skb); |
| 603 | goto free_neigh; |
| 604 | } |
| 605 | |
| 606 | send_status = batadv_send_skb_packet(tmp_skb, |
| 607 | neigh_node->if_incoming, |
| 608 | neigh_node->addr); |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 609 | if (send_status == NET_XMIT_SUCCESS) { |
| 610 | /* count the sent packet */ |
| 611 | switch (packet_subtype) { |
| 612 | case BATADV_P_DAT_DHT_GET: |
| 613 | batadv_inc_counter(bat_priv, |
| 614 | BATADV_CNT_DAT_GET_TX); |
| 615 | break; |
| 616 | case BATADV_P_DAT_DHT_PUT: |
| 617 | batadv_inc_counter(bat_priv, |
| 618 | BATADV_CNT_DAT_PUT_TX); |
| 619 | break; |
| 620 | } |
| 621 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 622 | /* packet sent to a candidate: return true */ |
| 623 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 624 | } |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 625 | free_neigh: |
| 626 | batadv_neigh_node_free_ref(neigh_node); |
| 627 | free_orig: |
| 628 | batadv_orig_node_free_ref(cand[i].orig_node); |
| 629 | } |
| 630 | |
| 631 | out: |
| 632 | kfree(cand); |
| 633 | return ret; |
| 634 | } |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 635 | |
| 636 | /** |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 637 | * batadv_dat_tvlv_container_update - update the dat tvlv container after dat |
| 638 | * setting change |
| 639 | * @bat_priv: the bat priv with all the soft interface information |
| 640 | */ |
| 641 | static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv) |
| 642 | { |
| 643 | char dat_mode; |
| 644 | |
| 645 | dat_mode = atomic_read(&bat_priv->distributed_arp_table); |
| 646 | |
| 647 | switch (dat_mode) { |
| 648 | case 0: |
| 649 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 650 | break; |
| 651 | case 1: |
| 652 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_DAT, 1, |
| 653 | NULL, 0); |
| 654 | break; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * batadv_dat_status_update - update the dat tvlv container after dat |
| 660 | * setting change |
| 661 | * @net_dev: the soft interface net device |
| 662 | */ |
| 663 | void batadv_dat_status_update(struct net_device *net_dev) |
| 664 | { |
| 665 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 666 | batadv_dat_tvlv_container_update(bat_priv); |
| 667 | } |
| 668 | |
| 669 | /** |
| 670 | * batadv_gw_tvlv_ogm_handler_v1 - process incoming dat tvlv container |
| 671 | * @bat_priv: the bat priv with all the soft interface information |
| 672 | * @orig: the orig_node of the ogm |
| 673 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) |
| 674 | * @tvlv_value: tvlv buffer containing the gateway data |
| 675 | * @tvlv_value_len: tvlv buffer length |
| 676 | */ |
| 677 | static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, |
| 678 | struct batadv_orig_node *orig, |
| 679 | uint8_t flags, |
| 680 | void *tvlv_value, |
| 681 | uint16_t tvlv_value_len) |
| 682 | { |
| 683 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) |
| 684 | orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_DAT; |
| 685 | else |
| 686 | orig->capabilities |= BATADV_ORIG_CAPA_HAS_DAT; |
| 687 | } |
| 688 | |
| 689 | /** |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 690 | * batadv_dat_hash_free - free the local DAT hash table |
| 691 | * @bat_priv: the bat priv with all the soft interface information |
| 692 | */ |
| 693 | static void batadv_dat_hash_free(struct batadv_priv *bat_priv) |
| 694 | { |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 695 | if (!bat_priv->dat.hash) |
| 696 | return; |
| 697 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 698 | __batadv_dat_purge(bat_priv, NULL); |
| 699 | |
| 700 | batadv_hash_destroy(bat_priv->dat.hash); |
| 701 | |
| 702 | bat_priv->dat.hash = NULL; |
| 703 | } |
| 704 | |
| 705 | /** |
| 706 | * batadv_dat_init - initialise the DAT internals |
| 707 | * @bat_priv: the bat priv with all the soft interface information |
| 708 | */ |
| 709 | int batadv_dat_init(struct batadv_priv *bat_priv) |
| 710 | { |
| 711 | if (bat_priv->dat.hash) |
| 712 | return 0; |
| 713 | |
| 714 | bat_priv->dat.hash = batadv_hash_new(1024); |
| 715 | |
| 716 | if (!bat_priv->dat.hash) |
| 717 | return -ENOMEM; |
| 718 | |
| 719 | batadv_dat_start_timer(bat_priv); |
| 720 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 721 | batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1, |
| 722 | NULL, BATADV_TVLV_DAT, 1, |
| 723 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
| 724 | batadv_dat_tvlv_container_update(bat_priv); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * batadv_dat_free - free the DAT internals |
| 730 | * @bat_priv: the bat priv with all the soft interface information |
| 731 | */ |
| 732 | void batadv_dat_free(struct batadv_priv *bat_priv) |
| 733 | { |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 734 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 735 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 736 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 737 | cancel_delayed_work_sync(&bat_priv->dat.work); |
| 738 | |
| 739 | batadv_dat_hash_free(bat_priv); |
| 740 | } |
| 741 | |
| 742 | /** |
| 743 | * batadv_dat_cache_seq_print_text - print the local DAT hash table |
| 744 | * @seq: seq file to print on |
| 745 | * @offset: not used |
| 746 | */ |
| 747 | int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) |
| 748 | { |
| 749 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 750 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 751 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
| 752 | struct batadv_dat_entry *dat_entry; |
| 753 | struct batadv_hard_iface *primary_if; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 754 | struct hlist_head *head; |
| 755 | unsigned long last_seen_jiffies; |
| 756 | int last_seen_msecs, last_seen_secs, last_seen_mins; |
| 757 | uint32_t i; |
| 758 | |
| 759 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 760 | if (!primary_if) |
| 761 | goto out; |
| 762 | |
| 763 | seq_printf(seq, "Distributed ARP Table (%s):\n", net_dev->name); |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 764 | seq_printf(seq, " %-7s %-9s %4s %11s\n", "IPv4", |
| 765 | "MAC", "VID", "last-seen"); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 766 | |
| 767 | for (i = 0; i < hash->size; i++) { |
| 768 | head = &hash->table[i]; |
| 769 | |
| 770 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 771 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 772 | last_seen_jiffies = jiffies - dat_entry->last_update; |
| 773 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); |
| 774 | last_seen_mins = last_seen_msecs / 60000; |
| 775 | last_seen_msecs = last_seen_msecs % 60000; |
| 776 | last_seen_secs = last_seen_msecs / 1000; |
| 777 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 778 | seq_printf(seq, " * %15pI4 %14pM %4i %6i:%02i\n", |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 779 | &dat_entry->ip, dat_entry->mac_addr, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 780 | BATADV_PRINT_VID(dat_entry->vid), |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 781 | last_seen_mins, last_seen_secs); |
| 782 | } |
| 783 | rcu_read_unlock(); |
| 784 | } |
| 785 | |
| 786 | out: |
| 787 | if (primary_if) |
| 788 | batadv_hardif_free_ref(primary_if); |
| 789 | return 0; |
| 790 | } |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 791 | |
| 792 | /** |
| 793 | * batadv_arp_get_type - parse an ARP packet and gets the type |
| 794 | * @bat_priv: the bat priv with all the soft interface information |
| 795 | * @skb: packet to analyse |
| 796 | * @hdr_size: size of the possible header before the ARP packet in the skb |
| 797 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 798 | * 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] | 799 | */ |
| 800 | static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv, |
| 801 | struct sk_buff *skb, int hdr_size) |
| 802 | { |
| 803 | struct arphdr *arphdr; |
| 804 | struct ethhdr *ethhdr; |
| 805 | __be32 ip_src, ip_dst; |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 806 | uint8_t *hw_src, *hw_dst; |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 807 | uint16_t type = 0; |
| 808 | |
| 809 | /* pull the ethernet header */ |
| 810 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN))) |
| 811 | goto out; |
| 812 | |
| 813 | ethhdr = (struct ethhdr *)(skb->data + hdr_size); |
| 814 | |
| 815 | if (ethhdr->h_proto != htons(ETH_P_ARP)) |
| 816 | goto out; |
| 817 | |
| 818 | /* pull the ARP payload */ |
| 819 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN + |
| 820 | arp_hdr_len(skb->dev)))) |
| 821 | goto out; |
| 822 | |
| 823 | arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN); |
| 824 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 825 | /* check whether the ARP packet carries a valid IP information */ |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 826 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
| 827 | goto out; |
| 828 | |
| 829 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
| 830 | goto out; |
| 831 | |
| 832 | if (arphdr->ar_hln != ETH_ALEN) |
| 833 | goto out; |
| 834 | |
| 835 | if (arphdr->ar_pln != 4) |
| 836 | goto out; |
| 837 | |
| 838 | /* Check for bad reply/request. If the ARP message is not sane, DAT |
| 839 | * will simply ignore it |
| 840 | */ |
| 841 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 842 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 843 | if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) || |
Matthias Schiffer | 757dd82 | 2013-01-24 18:18:26 +0100 | [diff] [blame] | 844 | ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) || |
| 845 | ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) || |
| 846 | ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst)) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 847 | goto out; |
| 848 | |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 849 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 850 | if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src)) |
| 851 | goto out; |
| 852 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 853 | /* don't care about the destination MAC address in ARP requests */ |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 854 | if (arphdr->ar_op != htons(ARPOP_REQUEST)) { |
| 855 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 856 | if (is_zero_ether_addr(hw_dst) || |
| 857 | is_multicast_ether_addr(hw_dst)) |
| 858 | goto out; |
| 859 | } |
| 860 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 861 | type = ntohs(arphdr->ar_op); |
| 862 | out: |
| 863 | return type; |
| 864 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 865 | |
| 866 | /** |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 867 | * batadv_dat_get_vid - extract the VLAN identifier from skb if any |
| 868 | * @skb: the buffer containing the packet to extract the VID from |
| 869 | * @hdr_size: the size of the batman-adv header encapsulating the packet |
| 870 | * |
| 871 | * If the packet embedded in the skb is vlan tagged this function returns the |
| 872 | * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. |
| 873 | */ |
| 874 | static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) |
| 875 | { |
| 876 | unsigned short vid; |
| 877 | |
| 878 | vid = batadv_get_vid(skb, *hdr_size); |
| 879 | |
| 880 | /* ARP parsing functions jump forward of hdr_size + ETH_HLEN. |
| 881 | * If the header contained in the packet is a VLAN one (which is longer) |
| 882 | * hdr_size is updated so that the functions will still skip the |
| 883 | * correct amount of bytes. |
| 884 | */ |
| 885 | if (vid & BATADV_VLAN_HAS_TAG) |
| 886 | *hdr_size += VLAN_HLEN; |
| 887 | |
| 888 | return vid; |
| 889 | } |
| 890 | |
| 891 | /** |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 892 | * batadv_dat_snoop_outgoing_arp_request - snoop the ARP request and try to |
| 893 | * answer using DAT |
| 894 | * @bat_priv: the bat priv with all the soft interface information |
| 895 | * @skb: packet to check |
| 896 | * |
| 897 | * 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] | 898 | * otherwise. In case of a positive return value the message has to be enqueued |
| 899 | * to permit the fallback. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 900 | */ |
| 901 | bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, |
| 902 | struct sk_buff *skb) |
| 903 | { |
| 904 | uint16_t type = 0; |
| 905 | __be32 ip_dst, ip_src; |
| 906 | uint8_t *hw_src; |
| 907 | bool ret = false; |
| 908 | struct batadv_dat_entry *dat_entry = NULL; |
| 909 | struct sk_buff *skb_new; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 910 | int hdr_size = 0; |
| 911 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 912 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 913 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 914 | goto out; |
| 915 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 916 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 917 | |
| 918 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 919 | /* If the node gets an ARP_REQUEST it has to send a DHT_GET unicast |
| 920 | * message to the selected DHT candidates |
| 921 | */ |
| 922 | if (type != ARPOP_REQUEST) |
| 923 | goto out; |
| 924 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 925 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 926 | "Parsing outgoing ARP REQUEST"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 927 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 928 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 929 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 930 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 931 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 932 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 933 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 934 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 935 | if (dat_entry) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 936 | /* If the ARP request is destined for a local client the local |
| 937 | * client will answer itself. DAT would only generate a |
| 938 | * duplicate packet. |
| 939 | * |
| 940 | * Moreover, if the soft-interface is enslaved into a bridge, an |
| 941 | * additional DAT answer may trigger kernel warnings about |
| 942 | * a packet coming from the wrong port. |
| 943 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 944 | if (batadv_is_my_client(bat_priv, dat_entry->mac_addr, |
| 945 | BATADV_NO_FLAGS)) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 946 | ret = true; |
| 947 | goto out; |
| 948 | } |
| 949 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 950 | skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 951 | bat_priv->soft_iface, ip_dst, hw_src, |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 952 | dat_entry->mac_addr, hw_src); |
| 953 | if (!skb_new) |
| 954 | goto out; |
| 955 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 956 | if (vid & BATADV_VLAN_HAS_TAG) |
| 957 | skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), |
| 958 | vid & VLAN_VID_MASK); |
| 959 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 960 | skb_reset_mac_header(skb_new); |
| 961 | skb_new->protocol = eth_type_trans(skb_new, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 962 | bat_priv->soft_iface); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 963 | bat_priv->stats.rx_packets++; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 964 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN + hdr_size; |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 965 | bat_priv->soft_iface->last_rx = jiffies; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 966 | |
| 967 | netif_rx(skb_new); |
| 968 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n"); |
| 969 | ret = true; |
| 970 | } else { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 971 | /* Send the request to the DHT */ |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 972 | ret = batadv_dat_send_data(bat_priv, skb, ip_dst, |
| 973 | BATADV_P_DAT_DHT_GET); |
| 974 | } |
| 975 | out: |
| 976 | if (dat_entry) |
| 977 | batadv_dat_entry_free_ref(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 978 | return ret; |
| 979 | } |
| 980 | |
| 981 | /** |
| 982 | * batadv_dat_snoop_incoming_arp_request - snoop the ARP request and try to |
| 983 | * answer using the local DAT storage |
| 984 | * @bat_priv: the bat priv with all the soft interface information |
| 985 | * @skb: packet to check |
| 986 | * @hdr_size: size of the encapsulation header |
| 987 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 988 | * Returns true if the request has been answered, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 989 | */ |
| 990 | bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, |
| 991 | struct sk_buff *skb, int hdr_size) |
| 992 | { |
| 993 | uint16_t type; |
| 994 | __be32 ip_src, ip_dst; |
| 995 | uint8_t *hw_src; |
| 996 | struct sk_buff *skb_new; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 997 | struct batadv_dat_entry *dat_entry = NULL; |
| 998 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 999 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1000 | int err; |
| 1001 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1002 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1003 | goto out; |
| 1004 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1005 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1006 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1007 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1008 | if (type != ARPOP_REQUEST) |
| 1009 | goto out; |
| 1010 | |
| 1011 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1012 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1013 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1014 | |
| 1015 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1016 | "Parsing incoming ARP REQUEST"); |
| 1017 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1018 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1019 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1020 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1021 | if (!dat_entry) |
| 1022 | goto out; |
| 1023 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1024 | skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src, |
Marek Lindner | 736292c | 2013-01-12 19:19:06 +0800 | [diff] [blame] | 1025 | bat_priv->soft_iface, ip_dst, hw_src, |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1026 | dat_entry->mac_addr, hw_src); |
| 1027 | |
| 1028 | if (!skb_new) |
| 1029 | goto out; |
| 1030 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1031 | if (vid & BATADV_VLAN_HAS_TAG) |
| 1032 | skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), |
| 1033 | vid & VLAN_VID_MASK); |
| 1034 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1035 | /* To preserve backwards compatibility, the node has choose the outgoing |
| 1036 | * format based on the incoming request packet type. The assumption is |
| 1037 | * 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] | 1038 | */ |
| 1039 | if (hdr_size == sizeof(struct batadv_unicast_4addr_packet)) |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame^] | 1040 | err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new, |
| 1041 | BATADV_P_DAT_CACHE_REPLY, |
| 1042 | vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1043 | else |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame^] | 1044 | err = batadv_send_skb_via_tt(bat_priv, skb_new, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1045 | |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame^] | 1046 | if (err != NET_XMIT_DROP) { |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1047 | batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1048 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1049 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1050 | out: |
| 1051 | if (dat_entry) |
| 1052 | batadv_dat_entry_free_ref(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1053 | if (ret) |
| 1054 | kfree_skb(skb); |
| 1055 | return ret; |
| 1056 | } |
| 1057 | |
| 1058 | /** |
| 1059 | * batadv_dat_snoop_outgoing_arp_reply - snoop the ARP reply and fill the DHT |
| 1060 | * @bat_priv: the bat priv with all the soft interface information |
| 1061 | * @skb: packet to check |
| 1062 | */ |
| 1063 | void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, |
| 1064 | struct sk_buff *skb) |
| 1065 | { |
| 1066 | uint16_t type; |
| 1067 | __be32 ip_src, ip_dst; |
| 1068 | uint8_t *hw_src, *hw_dst; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1069 | int hdr_size = 0; |
| 1070 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1071 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1072 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1073 | return; |
| 1074 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1075 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1076 | |
| 1077 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1078 | if (type != ARPOP_REPLY) |
| 1079 | return; |
| 1080 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1081 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1082 | "Parsing outgoing ARP REPLY"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1083 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1084 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1085 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1086 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1087 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1088 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1089 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1090 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1091 | |
| 1092 | /* 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] | 1093 | * the node obtained from the ARP reply |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1094 | */ |
| 1095 | batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT); |
| 1096 | batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT); |
| 1097 | } |
| 1098 | /** |
| 1099 | * batadv_dat_snoop_incoming_arp_reply - snoop the ARP reply and fill the local |
| 1100 | * DAT storage only |
| 1101 | * @bat_priv: the bat priv with all the soft interface information |
| 1102 | * @skb: packet to check |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1103 | * @hdr_size: size of the encapsulation header |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1104 | */ |
| 1105 | bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, |
| 1106 | struct sk_buff *skb, int hdr_size) |
| 1107 | { |
| 1108 | uint16_t type; |
| 1109 | __be32 ip_src, ip_dst; |
| 1110 | uint8_t *hw_src, *hw_dst; |
| 1111 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1112 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1113 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1114 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1115 | goto out; |
| 1116 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1117 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1118 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1119 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1120 | if (type != ARPOP_REPLY) |
| 1121 | goto out; |
| 1122 | |
| 1123 | batadv_dbg_arp(bat_priv, skb, type, hdr_size, |
| 1124 | "Parsing incoming ARP REPLY"); |
| 1125 | |
| 1126 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1127 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1128 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1129 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1130 | |
| 1131 | /* Update our internal cache with both the IP addresses the node got |
| 1132 | * within the ARP reply |
| 1133 | */ |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1134 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1135 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1136 | |
| 1137 | /* if this REPLY is directed to a client of mine, let's deliver the |
| 1138 | * packet to the interface |
| 1139 | */ |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1140 | ret = !batadv_is_my_client(bat_priv, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1141 | out: |
Matthias Schiffer | 0d15bec | 2013-01-23 18:11:53 +0100 | [diff] [blame] | 1142 | if (ret) |
| 1143 | kfree_skb(skb); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1144 | /* if ret == false -> packet has to be delivered to the interface */ |
| 1145 | return ret; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * 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] | 1150 | * (because the node has already obtained the reply via DAT) or not |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1151 | * @bat_priv: the bat priv with all the soft interface information |
| 1152 | * @forw_packet: the broadcast packet |
| 1153 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1154 | * Returns true if the node can drop the packet, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1155 | */ |
| 1156 | bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, |
| 1157 | struct batadv_forw_packet *forw_packet) |
| 1158 | { |
| 1159 | uint16_t type; |
| 1160 | __be32 ip_dst; |
| 1161 | struct batadv_dat_entry *dat_entry = NULL; |
| 1162 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1163 | int hdr_size = sizeof(struct batadv_bcast_packet); |
| 1164 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1165 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1166 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1167 | goto out; |
| 1168 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1169 | /* If this packet is an ARP_REQUEST and the node already has the |
| 1170 | * information that it is going to ask, then the packet can be dropped |
| 1171 | */ |
| 1172 | if (forw_packet->num_packets) |
| 1173 | goto out; |
| 1174 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1175 | vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size); |
| 1176 | |
| 1177 | type = batadv_arp_get_type(bat_priv, forw_packet->skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1178 | if (type != ARPOP_REQUEST) |
| 1179 | goto out; |
| 1180 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1181 | ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size); |
| 1182 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1183 | /* check if the node already got this entry */ |
| 1184 | if (!dat_entry) { |
| 1185 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1186 | "ARP Request for %pI4: fallback\n", &ip_dst); |
| 1187 | goto out; |
| 1188 | } |
| 1189 | |
| 1190 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1191 | "ARP Request for %pI4: fallback prevented\n", &ip_dst); |
| 1192 | ret = true; |
| 1193 | |
| 1194 | out: |
| 1195 | if (dat_entry) |
| 1196 | batadv_dat_entry_free_ref(dat_entry); |
| 1197 | return ret; |
| 1198 | } |