Sven Eckelmann | 7db7d9f | 2017-11-19 15:05:11 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Sven Eckelmann | 6b1aea8 | 2018-01-01 00:00:00 +0100 | [diff] [blame] | 2 | /* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors: |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 3 | * |
| 4 | * Antonio Quartulli |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of version 2 of the GNU General Public |
| 8 | * License as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 17 | */ |
| 18 | |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 19 | #include "distributed-arp-table.h" |
| 20 | #include "main.h" |
| 21 | |
| 22 | #include <linux/atomic.h> |
Linus Lüssing | 65d7d460 | 2015-06-16 17:10:22 +0200 | [diff] [blame] | 23 | #include <linux/bitops.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 24 | #include <linux/byteorder/generic.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/etherdevice.h> |
Sven Eckelmann | b92b94a | 2017-11-19 17:12:02 +0100 | [diff] [blame] | 27 | #include <linux/gfp.h> |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 28 | #include <linux/if_arp.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 29 | #include <linux/if_ether.h> |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 30 | #include <linux/if_vlan.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 31 | #include <linux/in.h> |
| 32 | #include <linux/jiffies.h> |
| 33 | #include <linux/kernel.h> |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 34 | #include <linux/kref.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 35 | #include <linux/list.h> |
Linus Lüssing | 41aeefc | 2018-03-13 11:41:12 +0100 | [diff] [blame] | 36 | #include <linux/netlink.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 37 | #include <linux/rculist.h> |
| 38 | #include <linux/rcupdate.h> |
| 39 | #include <linux/seq_file.h> |
| 40 | #include <linux/skbuff.h> |
| 41 | #include <linux/slab.h> |
| 42 | #include <linux/spinlock.h> |
| 43 | #include <linux/stddef.h> |
| 44 | #include <linux/string.h> |
| 45 | #include <linux/workqueue.h> |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 46 | #include <net/arp.h> |
Linus Lüssing | 41aeefc | 2018-03-13 11:41:12 +0100 | [diff] [blame] | 47 | #include <net/genetlink.h> |
| 48 | #include <net/netlink.h> |
| 49 | #include <net/sock.h> |
| 50 | #include <uapi/linux/batman_adv.h> |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 51 | |
Andreas Pape | 00311de | 2016-09-05 13:20:25 +0200 | [diff] [blame] | 52 | #include "bridge_loop_avoidance.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 53 | #include "hard-interface.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 54 | #include "hash.h" |
Sven Eckelmann | ba41208 | 2016-05-15 23:48:31 +0200 | [diff] [blame] | 55 | #include "log.h" |
Linus Lüssing | 41aeefc | 2018-03-13 11:41:12 +0100 | [diff] [blame] | 56 | #include "netlink.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 57 | #include "originator.h" |
| 58 | #include "send.h" |
Linus Lüssing | 41aeefc | 2018-03-13 11:41:12 +0100 | [diff] [blame] | 59 | #include "soft-interface.h" |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 60 | #include "translation-table.h" |
Markus Pargmann | 1f8dce4 | 2016-05-15 11:07:43 +0200 | [diff] [blame] | 61 | #include "tvlv.h" |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 62 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 63 | static void batadv_dat_purge(struct work_struct *work); |
| 64 | |
| 65 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 66 | * batadv_dat_start_timer() - initialise the DAT periodic worker |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 67 | * @bat_priv: the bat priv with all the soft interface information |
| 68 | */ |
| 69 | static void batadv_dat_start_timer(struct batadv_priv *bat_priv) |
| 70 | { |
| 71 | INIT_DELAYED_WORK(&bat_priv->dat.work, batadv_dat_purge); |
| 72 | queue_delayed_work(batadv_event_workqueue, &bat_priv->dat.work, |
| 73 | msecs_to_jiffies(10000)); |
| 74 | } |
| 75 | |
| 76 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 77 | * batadv_dat_entry_release() - release dat_entry from lists and queue for free |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 78 | * after rcu grace period |
| 79 | * @ref: kref pointer of the dat_entry |
| 80 | */ |
| 81 | static void batadv_dat_entry_release(struct kref *ref) |
| 82 | { |
| 83 | struct batadv_dat_entry *dat_entry; |
| 84 | |
| 85 | dat_entry = container_of(ref, struct batadv_dat_entry, refcount); |
| 86 | |
| 87 | kfree_rcu(dat_entry, rcu); |
| 88 | } |
| 89 | |
| 90 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 91 | * batadv_dat_entry_put() - decrement the dat_entry refcounter and possibly |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 92 | * release it |
| 93 | * @dat_entry: dat_entry to be free'd |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 94 | */ |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 95 | static void batadv_dat_entry_put(struct batadv_dat_entry *dat_entry) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 96 | { |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 97 | kref_put(&dat_entry->refcount, batadv_dat_entry_release); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 101 | * 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] | 102 | * @dat_entry: the entry to check |
| 103 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 104 | * Return: true if the entry has to be purged now, false otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 105 | */ |
| 106 | static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) |
| 107 | { |
| 108 | return batadv_has_timed_out(dat_entry->last_update, |
| 109 | BATADV_DAT_ENTRY_TIMEOUT); |
| 110 | } |
| 111 | |
| 112 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 113 | * __batadv_dat_purge() - delete entries from the DAT local storage |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 114 | * @bat_priv: the bat priv with all the soft interface information |
| 115 | * @to_purge: function in charge to decide whether an entry has to be purged or |
| 116 | * not. This function takes the dat_entry as argument and has to |
| 117 | * returns a boolean value: true is the entry has to be deleted, |
| 118 | * false otherwise |
| 119 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 120 | * Loops over each entry in the DAT local storage and deletes it if and only if |
| 121 | * the to_purge function passed as argument returns true. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 122 | */ |
| 123 | static void __batadv_dat_purge(struct batadv_priv *bat_priv, |
| 124 | bool (*to_purge)(struct batadv_dat_entry *)) |
| 125 | { |
| 126 | spinlock_t *list_lock; /* protects write access to the hash lists */ |
| 127 | struct batadv_dat_entry *dat_entry; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 128 | struct hlist_node *node_tmp; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 129 | struct hlist_head *head; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 130 | u32 i; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 131 | |
| 132 | if (!bat_priv->dat.hash) |
| 133 | return; |
| 134 | |
| 135 | for (i = 0; i < bat_priv->dat.hash->size; i++) { |
| 136 | head = &bat_priv->dat.hash->table[i]; |
| 137 | list_lock = &bat_priv->dat.hash->list_locks[i]; |
| 138 | |
| 139 | spin_lock_bh(list_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 140 | hlist_for_each_entry_safe(dat_entry, node_tmp, head, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 141 | hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 142 | /* if a helper function has been passed as parameter, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 143 | * ask it if the entry has to be purged or not |
| 144 | */ |
| 145 | if (to_purge && !to_purge(dat_entry)) |
| 146 | continue; |
| 147 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 148 | hlist_del_rcu(&dat_entry->hash_entry); |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 149 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 150 | } |
| 151 | spin_unlock_bh(list_lock); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 156 | * batadv_dat_purge() - periodic task that deletes old entries from the local |
| 157 | * DAT hash table |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 158 | * @work: kernel work struct |
| 159 | */ |
| 160 | static void batadv_dat_purge(struct work_struct *work) |
| 161 | { |
| 162 | struct delayed_work *delayed_work; |
| 163 | struct batadv_priv_dat *priv_dat; |
| 164 | struct batadv_priv *bat_priv; |
| 165 | |
Geliang Tang | 4ba4bc0 | 2015-12-28 23:43:37 +0800 | [diff] [blame] | 166 | delayed_work = to_delayed_work(work); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 167 | priv_dat = container_of(delayed_work, struct batadv_priv_dat, work); |
| 168 | bat_priv = container_of(priv_dat, struct batadv_priv, dat); |
| 169 | |
| 170 | __batadv_dat_purge(bat_priv, batadv_dat_to_purge); |
| 171 | batadv_dat_start_timer(bat_priv); |
| 172 | } |
| 173 | |
| 174 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 175 | * batadv_compare_dat() - comparing function used in the local DAT hash table |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 176 | * @node: node in the local table |
| 177 | * @data2: second object to compare the node to |
| 178 | * |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 179 | * Return: true if the two entries are the same, false otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 180 | */ |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 181 | static bool batadv_compare_dat(const struct hlist_node *node, const void *data2) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 182 | { |
| 183 | const void *data1 = container_of(node, struct batadv_dat_entry, |
| 184 | hash_entry); |
| 185 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 186 | return memcmp(data1, data2, sizeof(__be32)) == 0; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 187 | } |
| 188 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 189 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 190 | * batadv_arp_hw_src() - extract the hw_src field from an ARP packet |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 191 | * @skb: ARP packet |
| 192 | * @hdr_size: size of the possible header before the ARP packet |
| 193 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 194 | * Return: the value of the hw_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 195 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 196 | static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 197 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 198 | u8 *addr; |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 199 | |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 200 | addr = (u8 *)(skb->data + hdr_size); |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 201 | addr += ETH_HLEN + sizeof(struct arphdr); |
| 202 | |
| 203 | return addr; |
| 204 | } |
| 205 | |
| 206 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 207 | * batadv_arp_ip_src() - extract the ip_src field from an ARP packet |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 208 | * @skb: ARP packet |
| 209 | * @hdr_size: size of the possible header before the ARP packet |
| 210 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 211 | * Return: the value of the ip_src field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 212 | */ |
| 213 | static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) |
| 214 | { |
| 215 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN); |
| 216 | } |
| 217 | |
| 218 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 219 | * batadv_arp_hw_dst() - extract the hw_dst field from an ARP packet |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 220 | * @skb: ARP packet |
| 221 | * @hdr_size: size of the possible header before the ARP packet |
| 222 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 223 | * Return: the value of the hw_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 224 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 225 | static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 226 | { |
| 227 | return batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN + 4; |
| 228 | } |
| 229 | |
| 230 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 231 | * batadv_arp_ip_dst() - extract the ip_dst field from an ARP packet |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 232 | * @skb: ARP packet |
| 233 | * @hdr_size: size of the possible header before the ARP packet |
| 234 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 235 | * Return: the value of the ip_dst field in the ARP packet. |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 236 | */ |
| 237 | static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) |
| 238 | { |
| 239 | return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4); |
| 240 | } |
| 241 | |
| 242 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 243 | * batadv_hash_dat() - compute the hash value for an IP address |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 244 | * @data: data to hash |
| 245 | * @size: size of the hash table |
| 246 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 247 | * Return: the selected index in the hash table for the given data. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 248 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 249 | static u32 batadv_hash_dat(const void *data, u32 size) |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 250 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 251 | u32 hash = 0; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 252 | const struct batadv_dat_entry *dat = data; |
Sven Eckelmann | 36fd61c | 2015-03-01 09:46:18 +0100 | [diff] [blame] | 253 | const unsigned char *key; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 254 | u32 i; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 255 | |
Sven Eckelmann | 36fd61c | 2015-03-01 09:46:18 +0100 | [diff] [blame] | 256 | key = (const unsigned char *)&dat->ip; |
| 257 | for (i = 0; i < sizeof(dat->ip); i++) { |
| 258 | hash += key[i]; |
| 259 | hash += (hash << 10); |
| 260 | hash ^= (hash >> 6); |
| 261 | } |
| 262 | |
| 263 | key = (const unsigned char *)&dat->vid; |
| 264 | for (i = 0; i < sizeof(dat->vid); i++) { |
| 265 | hash += key[i]; |
| 266 | hash += (hash << 10); |
| 267 | hash ^= (hash >> 6); |
| 268 | } |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 269 | |
| 270 | hash += (hash << 3); |
| 271 | hash ^= (hash >> 11); |
| 272 | hash += (hash << 15); |
| 273 | |
| 274 | return hash % size; |
| 275 | } |
| 276 | |
| 277 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 278 | * 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] | 279 | * table |
| 280 | * @bat_priv: the bat priv with all the soft interface information |
| 281 | * @ip: search key |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 282 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 283 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 284 | * Return: the dat_entry if found, NULL otherwise. |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 285 | */ |
| 286 | static struct batadv_dat_entry * |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 287 | batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, |
| 288 | unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 289 | { |
| 290 | struct hlist_head *head; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 291 | struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 292 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 293 | u32 index; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 294 | |
| 295 | if (!hash) |
| 296 | return NULL; |
| 297 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 298 | to_find.ip = ip; |
| 299 | to_find.vid = vid; |
| 300 | |
| 301 | index = batadv_hash_dat(&to_find, hash->size); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 302 | head = &hash->table[index]; |
| 303 | |
| 304 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 305 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 306 | if (dat_entry->ip != ip) |
| 307 | continue; |
| 308 | |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 309 | if (!kref_get_unless_zero(&dat_entry->refcount)) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 310 | continue; |
| 311 | |
| 312 | dat_entry_tmp = dat_entry; |
| 313 | break; |
| 314 | } |
| 315 | rcu_read_unlock(); |
| 316 | |
| 317 | return dat_entry_tmp; |
| 318 | } |
| 319 | |
| 320 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 321 | * batadv_dat_entry_add() - add a new dat entry or update it if already exists |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 322 | * @bat_priv: the bat priv with all the soft interface information |
| 323 | * @ip: ipv4 to add/edit |
| 324 | * @mac_addr: mac address to assign to the given ipv4 |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 325 | * @vid: VLAN identifier |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 326 | */ |
| 327 | static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 328 | u8 *mac_addr, unsigned short vid) |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 329 | { |
| 330 | struct batadv_dat_entry *dat_entry; |
| 331 | int hash_added; |
| 332 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 333 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 334 | /* if this entry is already known, just update it */ |
| 335 | if (dat_entry) { |
| 336 | if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr)) |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 337 | ether_addr_copy(dat_entry->mac_addr, mac_addr); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 338 | dat_entry->last_update = jiffies; |
| 339 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 340 | "Entry updated: %pI4 %pM (vid: %d)\n", |
| 341 | &dat_entry->ip, dat_entry->mac_addr, |
Sven Eckelmann | f7a2bd6 | 2017-02-22 17:16:42 +0100 | [diff] [blame] | 342 | batadv_print_vid(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 343 | goto out; |
| 344 | } |
| 345 | |
| 346 | dat_entry = kmalloc(sizeof(*dat_entry), GFP_ATOMIC); |
| 347 | if (!dat_entry) |
| 348 | goto out; |
| 349 | |
| 350 | dat_entry->ip = ip; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 351 | dat_entry->vid = vid; |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 352 | ether_addr_copy(dat_entry->mac_addr, mac_addr); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 353 | dat_entry->last_update = jiffies; |
Sven Eckelmann | 68a6722 | 2016-01-16 10:29:47 +0100 | [diff] [blame] | 354 | kref_init(&dat_entry->refcount); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 355 | |
Sven Eckelmann | 6a51e09 | 2016-07-15 17:39:26 +0200 | [diff] [blame] | 356 | kref_get(&dat_entry->refcount); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 357 | hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat, |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 358 | batadv_hash_dat, dat_entry, |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 359 | &dat_entry->hash_entry); |
| 360 | |
| 361 | if (unlikely(hash_added != 0)) { |
| 362 | /* remove the reference for the hash */ |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 363 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 364 | goto out; |
| 365 | } |
| 366 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 367 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %d)\n", |
Sven Eckelmann | f7a2bd6 | 2017-02-22 17:16:42 +0100 | [diff] [blame] | 368 | &dat_entry->ip, dat_entry->mac_addr, batadv_print_vid(vid)); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 369 | |
| 370 | out: |
| 371 | if (dat_entry) |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 372 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 373 | } |
| 374 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 375 | #ifdef CONFIG_BATMAN_ADV_DEBUG |
| 376 | |
| 377 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 378 | * batadv_dbg_arp() - print a debug message containing all the ARP packet |
| 379 | * details |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 380 | * @bat_priv: the bat priv with all the soft interface information |
| 381 | * @skb: ARP packet |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 382 | * @hdr_size: size of the possible header before the ARP packet |
| 383 | * @msg: message to print together with the debugging information |
| 384 | */ |
| 385 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 386 | int hdr_size, char *msg) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 387 | { |
| 388 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
| 389 | struct batadv_bcast_packet *bcast_pkt; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 390 | u8 *orig_addr; |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 391 | __be32 ip_src, ip_dst; |
| 392 | |
| 393 | if (msg) |
| 394 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "%s\n", msg); |
| 395 | |
| 396 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 397 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 398 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 399 | "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n", |
| 400 | batadv_arp_hw_src(skb, hdr_size), &ip_src, |
| 401 | batadv_arp_hw_dst(skb, hdr_size), &ip_dst); |
| 402 | |
Matthias Schiffer | 6f27d2c | 2018-03-16 11:29:10 +0100 | [diff] [blame] | 403 | if (hdr_size < sizeof(struct batadv_unicast_packet)) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 404 | return; |
| 405 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 406 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
| 407 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 408 | switch (unicast_4addr_packet->u.packet_type) { |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 409 | case BATADV_UNICAST: |
| 410 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 411 | "* encapsulated within a UNICAST packet\n"); |
| 412 | break; |
| 413 | case BATADV_UNICAST_4ADDR: |
| 414 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 415 | "* encapsulated within a UNICAST_4ADDR packet (src: %pM)\n", |
| 416 | unicast_4addr_packet->src); |
| 417 | switch (unicast_4addr_packet->subtype) { |
| 418 | case BATADV_P_DAT_DHT_PUT: |
| 419 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_PUT\n"); |
| 420 | break; |
| 421 | case BATADV_P_DAT_DHT_GET: |
| 422 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_GET\n"); |
| 423 | break; |
| 424 | case BATADV_P_DAT_CACHE_REPLY: |
| 425 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 426 | "* type: DAT_CACHE_REPLY\n"); |
| 427 | break; |
| 428 | case BATADV_P_DATA: |
| 429 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DATA\n"); |
| 430 | break; |
| 431 | default: |
| 432 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: Unknown (%u)!\n", |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 433 | unicast_4addr_packet->u.packet_type); |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 434 | } |
| 435 | break; |
| 436 | case BATADV_BCAST: |
| 437 | bcast_pkt = (struct batadv_bcast_packet *)unicast_4addr_packet; |
| 438 | orig_addr = bcast_pkt->orig; |
| 439 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 440 | "* encapsulated within a BCAST packet (src: %pM)\n", |
| 441 | orig_addr); |
| 442 | break; |
| 443 | default: |
| 444 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 445 | "* encapsulated within an unknown packet type (0x%x)\n", |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 446 | unicast_4addr_packet->u.packet_type); |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 447 | } |
| 448 | } |
| 449 | |
| 450 | #else |
| 451 | |
| 452 | static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 453 | int hdr_size, char *msg) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 454 | { |
| 455 | } |
| 456 | |
| 457 | #endif /* CONFIG_BATMAN_ADV_DEBUG */ |
| 458 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 459 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 460 | * batadv_is_orig_node_eligible() - check whether a node can be a DHT candidate |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 461 | * @res: the array with the already selected candidates |
| 462 | * @select: number of already selected candidates |
| 463 | * @tmp_max: address of the currently evaluated node |
| 464 | * @max: current round max address |
| 465 | * @last_max: address of the last selected candidate |
| 466 | * @candidate: orig_node under evaluation |
| 467 | * @max_orig_node: last selected candidate |
| 468 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 469 | * Return: true if the node has been elected as next candidate or false |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 470 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 471 | */ |
| 472 | static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, |
| 473 | int select, batadv_dat_addr_t tmp_max, |
| 474 | batadv_dat_addr_t max, |
| 475 | batadv_dat_addr_t last_max, |
| 476 | struct batadv_orig_node *candidate, |
| 477 | struct batadv_orig_node *max_orig_node) |
| 478 | { |
| 479 | bool ret = false; |
| 480 | int j; |
| 481 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 482 | /* check if orig node candidate is running DAT */ |
Linus Lüssing | 65d7d460 | 2015-06-16 17:10:22 +0200 | [diff] [blame] | 483 | if (!test_bit(BATADV_ORIG_CAPA_HAS_DAT, &candidate->capabilities)) |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 484 | goto out; |
| 485 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 486 | /* Check if this node has already been selected... */ |
| 487 | for (j = 0; j < select; j++) |
| 488 | if (res[j].orig_node == candidate) |
| 489 | break; |
| 490 | /* ..and possibly skip it */ |
| 491 | if (j < select) |
| 492 | goto out; |
| 493 | /* sanity check: has it already been selected? This should not happen */ |
| 494 | if (tmp_max > last_max) |
| 495 | goto out; |
| 496 | /* check if during this iteration an originator with a closer dht |
| 497 | * address has already been found |
| 498 | */ |
| 499 | if (tmp_max < max) |
| 500 | goto out; |
| 501 | /* this is an hash collision with the temporary selected node. Choose |
| 502 | * the one with the lowest address |
| 503 | */ |
Sven Eckelmann | 825ffe1 | 2017-08-23 21:52:13 +0200 | [diff] [blame] | 504 | if (tmp_max == max && max_orig_node && |
Sven Eckelmann | d7625f9 | 2018-02-20 12:08:10 +0100 | [diff] [blame] | 505 | batadv_compare_eth(candidate->orig, max_orig_node->orig)) |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 506 | goto out; |
| 507 | |
| 508 | ret = true; |
| 509 | out: |
| 510 | return ret; |
| 511 | } |
| 512 | |
| 513 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 514 | * batadv_choose_next_candidate() - select the next DHT candidate |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 515 | * @bat_priv: the bat priv with all the soft interface information |
| 516 | * @cands: candidates array |
| 517 | * @select: number of candidates already present in the array |
| 518 | * @ip_key: key to look up in the DHT |
| 519 | * @last_max: pointer where the address of the selected candidate will be saved |
| 520 | */ |
| 521 | static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, |
| 522 | struct batadv_dat_candidate *cands, |
| 523 | int select, batadv_dat_addr_t ip_key, |
| 524 | batadv_dat_addr_t *last_max) |
| 525 | { |
Sven Eckelmann | 4f248cf | 2015-06-09 20:50:49 +0200 | [diff] [blame] | 526 | batadv_dat_addr_t max = 0; |
| 527 | batadv_dat_addr_t tmp_max = 0; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 528 | struct batadv_orig_node *orig_node, *max_orig_node = NULL; |
| 529 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 530 | struct hlist_head *head; |
| 531 | int i; |
| 532 | |
| 533 | /* if no node is eligible as candidate, leave the candidate type as |
| 534 | * NOT_FOUND |
| 535 | */ |
| 536 | cands[select].type = BATADV_DAT_CANDIDATE_NOT_FOUND; |
| 537 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 538 | /* iterate over the originator list and find the node with the closest |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 539 | * dat_address which has not been selected yet |
| 540 | */ |
| 541 | for (i = 0; i < hash->size; i++) { |
| 542 | head = &hash->table[i]; |
| 543 | |
| 544 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 545 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 546 | /* the dht space is a ring using unsigned addresses */ |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 547 | tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr + |
| 548 | ip_key; |
| 549 | |
| 550 | if (!batadv_is_orig_node_eligible(cands, select, |
| 551 | tmp_max, max, |
| 552 | *last_max, orig_node, |
| 553 | max_orig_node)) |
| 554 | continue; |
| 555 | |
Sven Eckelmann | 7c12439 | 2016-01-16 10:29:56 +0100 | [diff] [blame] | 556 | if (!kref_get_unless_zero(&orig_node->refcount)) |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 557 | continue; |
| 558 | |
| 559 | max = tmp_max; |
| 560 | if (max_orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 561 | batadv_orig_node_put(max_orig_node); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 562 | max_orig_node = orig_node; |
| 563 | } |
| 564 | rcu_read_unlock(); |
| 565 | } |
| 566 | if (max_orig_node) { |
| 567 | cands[select].type = BATADV_DAT_CANDIDATE_ORIG; |
| 568 | cands[select].orig_node = max_orig_node; |
| 569 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 570 | "dat_select_candidates() %d: selected %pM addr=%u dist=%u\n", |
| 571 | select, max_orig_node->orig, max_orig_node->dat_addr, |
| 572 | max); |
| 573 | } |
| 574 | *last_max = max; |
| 575 | } |
| 576 | |
| 577 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 578 | * batadv_dat_select_candidates() - select the nodes which the DHT message has |
| 579 | * to be sent to |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 580 | * @bat_priv: the bat priv with all the soft interface information |
| 581 | * @ip_dst: ipv4 to look up in the DHT |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 582 | * @vid: VLAN identifier |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 583 | * |
| 584 | * An originator O is selected if and only if its DHT_ID value is one of three |
| 585 | * closest values (from the LEFT, with wrap around if needed) then the hash |
| 586 | * value of the key. ip_dst is the key. |
| 587 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 588 | * Return: the candidate array of size BATADV_DAT_CANDIDATE_NUM. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 589 | */ |
| 590 | static struct batadv_dat_candidate * |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 591 | batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst, |
| 592 | unsigned short vid) |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 593 | { |
| 594 | int select; |
| 595 | batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; |
| 596 | struct batadv_dat_candidate *res; |
Sven Eckelmann | b7fe3d4 | 2015-11-03 10:05:44 +0100 | [diff] [blame] | 597 | struct batadv_dat_entry dat; |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 598 | |
| 599 | if (!bat_priv->orig_hash) |
| 600 | return NULL; |
| 601 | |
Antonio Quartulli | 0185dda | 2014-05-24 06:43:47 +0200 | [diff] [blame] | 602 | res = kmalloc_array(BATADV_DAT_CANDIDATES_NUM, sizeof(*res), |
| 603 | GFP_ATOMIC); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 604 | if (!res) |
| 605 | return NULL; |
| 606 | |
Sven Eckelmann | b7fe3d4 | 2015-11-03 10:05:44 +0100 | [diff] [blame] | 607 | dat.ip = ip_dst; |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 608 | dat.vid = vid; |
Sven Eckelmann | b7fe3d4 | 2015-11-03 10:05:44 +0100 | [diff] [blame] | 609 | ip_key = (batadv_dat_addr_t)batadv_hash_dat(&dat, |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 610 | BATADV_DAT_ADDR_MAX); |
| 611 | |
| 612 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
Sven Eckelmann | 22f0502 | 2017-05-19 13:02:00 +0200 | [diff] [blame] | 613 | "%s(): IP=%pI4 hash(IP)=%u\n", __func__, &ip_dst, |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 614 | ip_key); |
| 615 | |
| 616 | for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++) |
| 617 | batadv_choose_next_candidate(bat_priv, res, select, ip_key, |
| 618 | &last_max); |
| 619 | |
| 620 | return res; |
| 621 | } |
| 622 | |
| 623 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 624 | * batadv_dat_send_data() - send a payload to the selected candidates |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 625 | * @bat_priv: the bat priv with all the soft interface information |
| 626 | * @skb: payload to send |
| 627 | * @ip: the DHT key |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 628 | * @vid: VLAN identifier |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 629 | * @packet_subtype: unicast4addr packet subtype to use |
| 630 | * |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 631 | * This function copies the skb with pskb_copy() and is sent as unicast packet |
| 632 | * to each of the selected candidates. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 633 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 634 | * Return: true if the packet is sent to at least one candidate, false |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 635 | * otherwise. |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 636 | */ |
| 637 | static bool batadv_dat_send_data(struct batadv_priv *bat_priv, |
| 638 | struct sk_buff *skb, __be32 ip, |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 639 | unsigned short vid, int packet_subtype) |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 640 | { |
| 641 | int i; |
| 642 | bool ret = false; |
| 643 | int send_status; |
| 644 | struct batadv_neigh_node *neigh_node = NULL; |
| 645 | struct sk_buff *tmp_skb; |
| 646 | struct batadv_dat_candidate *cand; |
| 647 | |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 648 | cand = batadv_dat_select_candidates(bat_priv, ip, vid); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 649 | if (!cand) |
| 650 | goto out; |
| 651 | |
| 652 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip); |
| 653 | |
| 654 | for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) { |
| 655 | if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND) |
| 656 | continue; |
| 657 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 658 | neigh_node = batadv_orig_router_get(cand[i].orig_node, |
| 659 | BATADV_IF_DEFAULT); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 660 | if (!neigh_node) |
| 661 | goto free_orig; |
| 662 | |
Octavian Purdila | bad93e9 | 2014-06-12 01:36:26 +0300 | [diff] [blame] | 663 | tmp_skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
Martin Hundebøll | f097e25 | 2013-05-23 16:53:01 +0200 | [diff] [blame] | 664 | if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb, |
| 665 | cand[i].orig_node, |
| 666 | packet_subtype)) { |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 667 | kfree_skb(tmp_skb); |
| 668 | goto free_neigh; |
| 669 | } |
| 670 | |
Antonio Quartulli | 95d3927 | 2016-01-16 16:40:15 +0800 | [diff] [blame] | 671 | send_status = batadv_send_unicast_skb(tmp_skb, neigh_node); |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 672 | if (send_status == NET_XMIT_SUCCESS) { |
| 673 | /* count the sent packet */ |
| 674 | switch (packet_subtype) { |
| 675 | case BATADV_P_DAT_DHT_GET: |
| 676 | batadv_inc_counter(bat_priv, |
| 677 | BATADV_CNT_DAT_GET_TX); |
| 678 | break; |
| 679 | case BATADV_P_DAT_DHT_PUT: |
| 680 | batadv_inc_counter(bat_priv, |
| 681 | BATADV_CNT_DAT_PUT_TX); |
| 682 | break; |
| 683 | } |
| 684 | |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 685 | /* packet sent to a candidate: return true */ |
| 686 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 687 | } |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 688 | free_neigh: |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 689 | batadv_neigh_node_put(neigh_node); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 690 | free_orig: |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 691 | batadv_orig_node_put(cand[i].orig_node); |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | out: |
| 695 | kfree(cand); |
| 696 | return ret; |
| 697 | } |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 698 | |
| 699 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 700 | * batadv_dat_tvlv_container_update() - update the dat tvlv container after dat |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 701 | * setting change |
| 702 | * @bat_priv: the bat priv with all the soft interface information |
| 703 | */ |
| 704 | static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv) |
| 705 | { |
| 706 | char dat_mode; |
| 707 | |
| 708 | dat_mode = atomic_read(&bat_priv->distributed_arp_table); |
| 709 | |
| 710 | switch (dat_mode) { |
| 711 | case 0: |
| 712 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 713 | break; |
| 714 | case 1: |
| 715 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_DAT, 1, |
| 716 | NULL, 0); |
| 717 | break; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 722 | * batadv_dat_status_update() - update the dat tvlv container after dat |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 723 | * setting change |
| 724 | * @net_dev: the soft interface net device |
| 725 | */ |
| 726 | void batadv_dat_status_update(struct net_device *net_dev) |
| 727 | { |
| 728 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
Antonio Quartulli | f138694 | 2014-05-10 18:56:37 +0200 | [diff] [blame] | 729 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 730 | batadv_dat_tvlv_container_update(bat_priv); |
| 731 | } |
| 732 | |
| 733 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 734 | * batadv_dat_tvlv_ogm_handler_v1() - process incoming dat tvlv container |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 735 | * @bat_priv: the bat priv with all the soft interface information |
| 736 | * @orig: the orig_node of the ogm |
| 737 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) |
| 738 | * @tvlv_value: tvlv buffer containing the gateway data |
| 739 | * @tvlv_value_len: tvlv buffer length |
| 740 | */ |
| 741 | static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, |
| 742 | struct batadv_orig_node *orig, |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 743 | u8 flags, |
| 744 | void *tvlv_value, u16 tvlv_value_len) |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 745 | { |
| 746 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) |
Linus Lüssing | 65d7d460 | 2015-06-16 17:10:22 +0200 | [diff] [blame] | 747 | clear_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 748 | else |
Linus Lüssing | 65d7d460 | 2015-06-16 17:10:22 +0200 | [diff] [blame] | 749 | set_bit(BATADV_ORIG_CAPA_HAS_DAT, &orig->capabilities); |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 753 | * batadv_dat_hash_free() - free the local DAT hash table |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 754 | * @bat_priv: the bat priv with all the soft interface information |
| 755 | */ |
| 756 | static void batadv_dat_hash_free(struct batadv_priv *bat_priv) |
| 757 | { |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 758 | if (!bat_priv->dat.hash) |
| 759 | return; |
| 760 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 761 | __batadv_dat_purge(bat_priv, NULL); |
| 762 | |
| 763 | batadv_hash_destroy(bat_priv->dat.hash); |
| 764 | |
| 765 | bat_priv->dat.hash = NULL; |
| 766 | } |
| 767 | |
| 768 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 769 | * batadv_dat_init() - initialise the DAT internals |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 770 | * @bat_priv: the bat priv with all the soft interface information |
Antonio Quartulli | fe13c2a | 2015-11-17 16:40:51 +0800 | [diff] [blame] | 771 | * |
| 772 | * Return: 0 in case of success, a negative error code otherwise |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 773 | */ |
| 774 | int batadv_dat_init(struct batadv_priv *bat_priv) |
| 775 | { |
| 776 | if (bat_priv->dat.hash) |
| 777 | return 0; |
| 778 | |
| 779 | bat_priv->dat.hash = batadv_hash_new(1024); |
| 780 | |
| 781 | if (!bat_priv->dat.hash) |
| 782 | return -ENOMEM; |
| 783 | |
| 784 | batadv_dat_start_timer(bat_priv); |
| 785 | |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 786 | batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1, |
| 787 | NULL, BATADV_TVLV_DAT, 1, |
| 788 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); |
| 789 | batadv_dat_tvlv_container_update(bat_priv); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 790 | return 0; |
| 791 | } |
| 792 | |
| 793 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 794 | * batadv_dat_free() - free the DAT internals |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 795 | * @bat_priv: the bat priv with all the soft interface information |
| 796 | */ |
| 797 | void batadv_dat_free(struct batadv_priv *bat_priv) |
| 798 | { |
Marek Lindner | 17cf0ea | 2013-04-23 21:39:59 +0800 | [diff] [blame] | 799 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 800 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_DAT, 1); |
| 801 | |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 802 | cancel_delayed_work_sync(&bat_priv->dat.work); |
| 803 | |
| 804 | batadv_dat_hash_free(bat_priv); |
| 805 | } |
| 806 | |
Sven Eckelmann | dc1cbd1 | 2016-07-16 09:31:20 +0200 | [diff] [blame] | 807 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 808 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 809 | * batadv_dat_cache_seq_print_text() - print the local DAT hash table |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 810 | * @seq: seq file to print on |
| 811 | * @offset: not used |
Antonio Quartulli | fe13c2a | 2015-11-17 16:40:51 +0800 | [diff] [blame] | 812 | * |
| 813 | * Return: always 0 |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 814 | */ |
| 815 | int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) |
| 816 | { |
| 817 | struct net_device *net_dev = (struct net_device *)seq->private; |
| 818 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
| 819 | struct batadv_hashtable *hash = bat_priv->dat.hash; |
| 820 | struct batadv_dat_entry *dat_entry; |
| 821 | struct batadv_hard_iface *primary_if; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 822 | struct hlist_head *head; |
| 823 | unsigned long last_seen_jiffies; |
| 824 | int last_seen_msecs, last_seen_secs, last_seen_mins; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 825 | u32 i; |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 826 | |
| 827 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
| 828 | if (!primary_if) |
| 829 | goto out; |
| 830 | |
| 831 | seq_printf(seq, "Distributed ARP Table (%s):\n", net_dev->name); |
Antonio Quartulli | 925a6f3 | 2016-03-12 10:30:18 +0100 | [diff] [blame] | 832 | seq_puts(seq, |
| 833 | " IPv4 MAC VID last-seen\n"); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 834 | |
| 835 | for (i = 0; i < hash->size; i++) { |
| 836 | head = &hash->table[i]; |
| 837 | |
| 838 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 839 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 840 | last_seen_jiffies = jiffies - dat_entry->last_update; |
| 841 | last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); |
| 842 | last_seen_mins = last_seen_msecs / 60000; |
| 843 | last_seen_msecs = last_seen_msecs % 60000; |
| 844 | last_seen_secs = last_seen_msecs / 1000; |
| 845 | |
Joe Perches | cd0edf3a | 2017-06-14 02:33:52 -0700 | [diff] [blame] | 846 | seq_printf(seq, " * %15pI4 %pM %4i %6i:%02i\n", |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 847 | &dat_entry->ip, dat_entry->mac_addr, |
Sven Eckelmann | f7a2bd6 | 2017-02-22 17:16:42 +0100 | [diff] [blame] | 848 | batadv_print_vid(dat_entry->vid), |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 849 | last_seen_mins, last_seen_secs); |
| 850 | } |
| 851 | rcu_read_unlock(); |
| 852 | } |
| 853 | |
| 854 | out: |
| 855 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 856 | batadv_hardif_put(primary_if); |
Antonio Quartulli | 2f1dfbe | 2012-06-30 20:01:19 +0200 | [diff] [blame] | 857 | return 0; |
| 858 | } |
Sven Eckelmann | dc1cbd1 | 2016-07-16 09:31:20 +0200 | [diff] [blame] | 859 | #endif |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 860 | |
| 861 | /** |
Linus Lüssing | 41aeefc | 2018-03-13 11:41:12 +0100 | [diff] [blame] | 862 | * batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a |
| 863 | * netlink socket |
| 864 | * @msg: buffer for the message |
| 865 | * @portid: netlink port |
| 866 | * @seq: Sequence number of netlink message |
| 867 | * @dat_entry: entry to dump |
| 868 | * |
| 869 | * Return: 0 or error code. |
| 870 | */ |
| 871 | static int |
| 872 | batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| 873 | struct batadv_dat_entry *dat_entry) |
| 874 | { |
| 875 | int msecs; |
| 876 | void *hdr; |
| 877 | |
| 878 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| 879 | NLM_F_MULTI, BATADV_CMD_GET_DAT_CACHE); |
| 880 | if (!hdr) |
| 881 | return -ENOBUFS; |
| 882 | |
| 883 | msecs = jiffies_to_msecs(jiffies - dat_entry->last_update); |
| 884 | |
| 885 | if (nla_put_in_addr(msg, BATADV_ATTR_DAT_CACHE_IP4ADDRESS, |
| 886 | dat_entry->ip) || |
| 887 | nla_put(msg, BATADV_ATTR_DAT_CACHE_HWADDRESS, ETH_ALEN, |
| 888 | dat_entry->mac_addr) || |
| 889 | nla_put_u16(msg, BATADV_ATTR_DAT_CACHE_VID, dat_entry->vid) || |
| 890 | nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { |
| 891 | genlmsg_cancel(msg, hdr); |
| 892 | return -EMSGSIZE; |
| 893 | } |
| 894 | |
| 895 | genlmsg_end(msg, hdr); |
| 896 | return 0; |
| 897 | } |
| 898 | |
| 899 | /** |
| 900 | * batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to |
| 901 | * a netlink socket |
| 902 | * @msg: buffer for the message |
| 903 | * @portid: netlink port |
| 904 | * @seq: Sequence number of netlink message |
| 905 | * @head: bucket to dump |
| 906 | * @idx_skip: How many entries to skip |
| 907 | * |
| 908 | * Return: 0 or error code. |
| 909 | */ |
| 910 | static int |
| 911 | batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, |
| 912 | struct hlist_head *head, int *idx_skip) |
| 913 | { |
| 914 | struct batadv_dat_entry *dat_entry; |
| 915 | int idx = 0; |
| 916 | |
| 917 | rcu_read_lock(); |
| 918 | hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { |
| 919 | if (idx < *idx_skip) |
| 920 | goto skip; |
| 921 | |
| 922 | if (batadv_dat_cache_dump_entry(msg, portid, seq, |
| 923 | dat_entry)) { |
| 924 | rcu_read_unlock(); |
| 925 | *idx_skip = idx; |
| 926 | |
| 927 | return -EMSGSIZE; |
| 928 | } |
| 929 | |
| 930 | skip: |
| 931 | idx++; |
| 932 | } |
| 933 | rcu_read_unlock(); |
| 934 | |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | /** |
| 939 | * batadv_dat_cache_dump() - dump DAT cache table to a netlink socket |
| 940 | * @msg: buffer for the message |
| 941 | * @cb: callback structure containing arguments |
| 942 | * |
| 943 | * Return: message length. |
| 944 | */ |
| 945 | int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) |
| 946 | { |
| 947 | struct batadv_hard_iface *primary_if = NULL; |
| 948 | int portid = NETLINK_CB(cb->skb).portid; |
| 949 | struct net *net = sock_net(cb->skb->sk); |
| 950 | struct net_device *soft_iface; |
| 951 | struct batadv_hashtable *hash; |
| 952 | struct batadv_priv *bat_priv; |
| 953 | int bucket = cb->args[0]; |
| 954 | struct hlist_head *head; |
| 955 | int idx = cb->args[1]; |
| 956 | int ifindex; |
| 957 | int ret = 0; |
| 958 | |
| 959 | ifindex = batadv_netlink_get_ifindex(cb->nlh, |
| 960 | BATADV_ATTR_MESH_IFINDEX); |
| 961 | if (!ifindex) |
| 962 | return -EINVAL; |
| 963 | |
| 964 | soft_iface = dev_get_by_index(net, ifindex); |
| 965 | if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { |
| 966 | ret = -ENODEV; |
| 967 | goto out; |
| 968 | } |
| 969 | |
| 970 | bat_priv = netdev_priv(soft_iface); |
| 971 | hash = bat_priv->dat.hash; |
| 972 | |
| 973 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 974 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
| 975 | ret = -ENOENT; |
| 976 | goto out; |
| 977 | } |
| 978 | |
| 979 | while (bucket < hash->size) { |
| 980 | head = &hash->table[bucket]; |
| 981 | |
| 982 | if (batadv_dat_cache_dump_bucket(msg, portid, |
| 983 | cb->nlh->nlmsg_seq, head, |
| 984 | &idx)) |
| 985 | break; |
| 986 | |
| 987 | bucket++; |
| 988 | idx = 0; |
| 989 | } |
| 990 | |
| 991 | cb->args[0] = bucket; |
| 992 | cb->args[1] = idx; |
| 993 | |
| 994 | ret = msg->len; |
| 995 | |
| 996 | out: |
| 997 | if (primary_if) |
| 998 | batadv_hardif_put(primary_if); |
| 999 | |
| 1000 | if (soft_iface) |
| 1001 | dev_put(soft_iface); |
| 1002 | |
| 1003 | return ret; |
| 1004 | } |
| 1005 | |
| 1006 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1007 | * batadv_arp_get_type() - parse an ARP packet and gets the type |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1008 | * @bat_priv: the bat priv with all the soft interface information |
| 1009 | * @skb: packet to analyse |
| 1010 | * @hdr_size: size of the possible header before the ARP packet in the skb |
| 1011 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1012 | * Return: 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] | 1013 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1014 | static u16 batadv_arp_get_type(struct batadv_priv *bat_priv, |
| 1015 | struct sk_buff *skb, int hdr_size) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1016 | { |
| 1017 | struct arphdr *arphdr; |
| 1018 | struct ethhdr *ethhdr; |
| 1019 | __be32 ip_src, ip_dst; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1020 | u8 *hw_src, *hw_dst; |
| 1021 | u16 type = 0; |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1022 | |
| 1023 | /* pull the ethernet header */ |
| 1024 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN))) |
| 1025 | goto out; |
| 1026 | |
| 1027 | ethhdr = (struct ethhdr *)(skb->data + hdr_size); |
| 1028 | |
| 1029 | if (ethhdr->h_proto != htons(ETH_P_ARP)) |
| 1030 | goto out; |
| 1031 | |
| 1032 | /* pull the ARP payload */ |
| 1033 | if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN + |
| 1034 | arp_hdr_len(skb->dev)))) |
| 1035 | goto out; |
| 1036 | |
| 1037 | arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN); |
| 1038 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1039 | /* check whether the ARP packet carries a valid IP information */ |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1040 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
| 1041 | goto out; |
| 1042 | |
| 1043 | if (arphdr->ar_pro != htons(ETH_P_IP)) |
| 1044 | goto out; |
| 1045 | |
| 1046 | if (arphdr->ar_hln != ETH_ALEN) |
| 1047 | goto out; |
| 1048 | |
| 1049 | if (arphdr->ar_pln != 4) |
| 1050 | goto out; |
| 1051 | |
| 1052 | /* Check for bad reply/request. If the ARP message is not sane, DAT |
| 1053 | * will simply ignore it |
| 1054 | */ |
| 1055 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1056 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1057 | if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) || |
Matthias Schiffer | 757dd82 | 2013-01-24 18:18:26 +0100 | [diff] [blame] | 1058 | ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) || |
| 1059 | ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) || |
| 1060 | ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst)) |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1061 | goto out; |
| 1062 | |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 1063 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1064 | if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src)) |
| 1065 | goto out; |
| 1066 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1067 | /* don't care about the destination MAC address in ARP requests */ |
Matthias Schiffer | b618ad1 | 2013-01-24 18:18:27 +0100 | [diff] [blame] | 1068 | if (arphdr->ar_op != htons(ARPOP_REQUEST)) { |
| 1069 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1070 | if (is_zero_ether_addr(hw_dst) || |
| 1071 | is_multicast_ether_addr(hw_dst)) |
| 1072 | goto out; |
| 1073 | } |
| 1074 | |
Antonio Quartulli | 5c3a0e5 | 2011-06-02 12:29:51 +0200 | [diff] [blame] | 1075 | type = ntohs(arphdr->ar_op); |
| 1076 | out: |
| 1077 | return type; |
| 1078 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1079 | |
| 1080 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1081 | * batadv_dat_get_vid() - extract the VLAN identifier from skb if any |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1082 | * @skb: the buffer containing the packet to extract the VID from |
| 1083 | * @hdr_size: the size of the batman-adv header encapsulating the packet |
| 1084 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1085 | * Return: If the packet embedded in the skb is vlan tagged this function |
| 1086 | * returns the VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS |
| 1087 | * is returned. |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1088 | */ |
| 1089 | static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) |
| 1090 | { |
| 1091 | unsigned short vid; |
| 1092 | |
| 1093 | vid = batadv_get_vid(skb, *hdr_size); |
| 1094 | |
| 1095 | /* ARP parsing functions jump forward of hdr_size + ETH_HLEN. |
| 1096 | * If the header contained in the packet is a VLAN one (which is longer) |
| 1097 | * hdr_size is updated so that the functions will still skip the |
| 1098 | * correct amount of bytes. |
| 1099 | */ |
| 1100 | if (vid & BATADV_VLAN_HAS_TAG) |
| 1101 | *hdr_size += VLAN_HLEN; |
| 1102 | |
| 1103 | return vid; |
| 1104 | } |
| 1105 | |
| 1106 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1107 | * batadv_dat_arp_create_reply() - create an ARP Reply |
Linus Lüssing | cbfc16d | 2016-07-05 20:01:36 +0200 | [diff] [blame] | 1108 | * @bat_priv: the bat priv with all the soft interface information |
| 1109 | * @ip_src: ARP sender IP |
| 1110 | * @ip_dst: ARP target IP |
| 1111 | * @hw_src: Ethernet source and ARP sender MAC |
| 1112 | * @hw_dst: Ethernet destination and ARP target MAC |
| 1113 | * @vid: VLAN identifier (optional, set to zero otherwise) |
| 1114 | * |
| 1115 | * Creates an ARP Reply from the given values, optionally encapsulated in a |
| 1116 | * VLAN header. |
| 1117 | * |
| 1118 | * Return: An skb containing an ARP Reply. |
| 1119 | */ |
| 1120 | static struct sk_buff * |
| 1121 | batadv_dat_arp_create_reply(struct batadv_priv *bat_priv, __be32 ip_src, |
| 1122 | __be32 ip_dst, u8 *hw_src, u8 *hw_dst, |
| 1123 | unsigned short vid) |
| 1124 | { |
| 1125 | struct sk_buff *skb; |
| 1126 | |
| 1127 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_dst, bat_priv->soft_iface, |
| 1128 | ip_src, hw_dst, hw_src, hw_dst); |
| 1129 | if (!skb) |
| 1130 | return NULL; |
| 1131 | |
| 1132 | skb_reset_mac_header(skb); |
| 1133 | |
| 1134 | if (vid & BATADV_VLAN_HAS_TAG) |
| 1135 | skb = vlan_insert_tag(skb, htons(ETH_P_8021Q), |
| 1136 | vid & VLAN_VID_MASK); |
| 1137 | |
| 1138 | return skb; |
| 1139 | } |
| 1140 | |
| 1141 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1142 | * batadv_dat_snoop_outgoing_arp_request() - snoop the ARP request and try to |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1143 | * answer using DAT |
| 1144 | * @bat_priv: the bat priv with all the soft interface information |
| 1145 | * @skb: packet to check |
| 1146 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1147 | * Return: true if the message has been sent to the dht candidates, false |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1148 | * otherwise. In case of a positive return value the message has to be enqueued |
| 1149 | * to permit the fallback. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1150 | */ |
| 1151 | bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, |
| 1152 | struct sk_buff *skb) |
| 1153 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1154 | u16 type = 0; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1155 | __be32 ip_dst, ip_src; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1156 | u8 *hw_src; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1157 | bool ret = false; |
| 1158 | struct batadv_dat_entry *dat_entry = NULL; |
| 1159 | struct sk_buff *skb_new; |
Tobias Klauser | ab044f8 | 2017-04-05 13:46:31 +0200 | [diff] [blame] | 1160 | struct net_device *soft_iface = bat_priv->soft_iface; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1161 | int hdr_size = 0; |
| 1162 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1163 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1164 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1165 | goto out; |
| 1166 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1167 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1168 | |
| 1169 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1170 | /* If the node gets an ARP_REQUEST it has to send a DHT_GET unicast |
| 1171 | * message to the selected DHT candidates |
| 1172 | */ |
| 1173 | if (type != ARPOP_REQUEST) |
| 1174 | goto out; |
| 1175 | |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 1176 | batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REQUEST"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1177 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1178 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1179 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1180 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1181 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1182 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1183 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1184 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1185 | if (dat_entry) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 1186 | /* If the ARP request is destined for a local client the local |
| 1187 | * client will answer itself. DAT would only generate a |
| 1188 | * duplicate packet. |
| 1189 | * |
| 1190 | * Moreover, if the soft-interface is enslaved into a bridge, an |
| 1191 | * additional DAT answer may trigger kernel warnings about |
| 1192 | * a packet coming from the wrong port. |
| 1193 | */ |
Antonio Quartulli | cc2f338 | 2014-03-29 17:27:38 +0100 | [diff] [blame] | 1194 | if (batadv_is_my_client(bat_priv, dat_entry->mac_addr, vid)) { |
Antonio Quartulli | 88e48d7 | 2013-05-09 09:35:45 +0200 | [diff] [blame] | 1195 | ret = true; |
| 1196 | goto out; |
| 1197 | } |
| 1198 | |
Andreas Pape | 00311de | 2016-09-05 13:20:25 +0200 | [diff] [blame] | 1199 | /* If BLA is enabled, only send ARP replies if we have claimed |
| 1200 | * the destination for the ARP request or if no one else of |
| 1201 | * the backbone gws belonging to our backbone has claimed the |
| 1202 | * destination. |
| 1203 | */ |
| 1204 | if (!batadv_bla_check_claim(bat_priv, |
| 1205 | dat_entry->mac_addr, vid)) { |
| 1206 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1207 | "Device %pM claimed by another backbone gw. Don't send ARP reply!", |
| 1208 | dat_entry->mac_addr); |
| 1209 | ret = true; |
| 1210 | goto out; |
| 1211 | } |
| 1212 | |
Linus Lüssing | cbfc16d | 2016-07-05 20:01:36 +0200 | [diff] [blame] | 1213 | skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src, |
| 1214 | dat_entry->mac_addr, |
| 1215 | hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1216 | if (!skb_new) |
| 1217 | goto out; |
| 1218 | |
Tobias Klauser | ab044f8 | 2017-04-05 13:46:31 +0200 | [diff] [blame] | 1219 | skb_new->protocol = eth_type_trans(skb_new, soft_iface); |
| 1220 | |
Sven Eckelmann | 36d4d68 | 2017-04-05 16:26:17 +0200 | [diff] [blame] | 1221 | batadv_inc_counter(bat_priv, BATADV_CNT_RX); |
| 1222 | batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, |
| 1223 | skb->len + ETH_HLEN + hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1224 | |
| 1225 | netif_rx(skb_new); |
| 1226 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n"); |
| 1227 | ret = true; |
| 1228 | } else { |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1229 | /* Send the request to the DHT */ |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 1230 | ret = batadv_dat_send_data(bat_priv, skb, ip_dst, vid, |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1231 | BATADV_P_DAT_DHT_GET); |
| 1232 | } |
| 1233 | out: |
| 1234 | if (dat_entry) |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 1235 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1236 | return ret; |
| 1237 | } |
| 1238 | |
| 1239 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1240 | * batadv_dat_snoop_incoming_arp_request() - snoop the ARP request and try to |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1241 | * answer using the local DAT storage |
| 1242 | * @bat_priv: the bat priv with all the soft interface information |
| 1243 | * @skb: packet to check |
| 1244 | * @hdr_size: size of the encapsulation header |
| 1245 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1246 | * Return: true if the request has been answered, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1247 | */ |
| 1248 | bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, |
| 1249 | struct sk_buff *skb, int hdr_size) |
| 1250 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1251 | u16 type; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1252 | __be32 ip_src, ip_dst; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1253 | u8 *hw_src; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1254 | struct sk_buff *skb_new; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1255 | struct batadv_dat_entry *dat_entry = NULL; |
| 1256 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1257 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1258 | int err; |
| 1259 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1260 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1261 | goto out; |
| 1262 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1263 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1264 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1265 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1266 | if (type != ARPOP_REQUEST) |
| 1267 | goto out; |
| 1268 | |
| 1269 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1270 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1271 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1272 | |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 1273 | batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REQUEST"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1274 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1275 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1276 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1277 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1278 | if (!dat_entry) |
| 1279 | goto out; |
| 1280 | |
Linus Lüssing | cbfc16d | 2016-07-05 20:01:36 +0200 | [diff] [blame] | 1281 | skb_new = batadv_dat_arp_create_reply(bat_priv, ip_dst, ip_src, |
| 1282 | dat_entry->mac_addr, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1283 | if (!skb_new) |
| 1284 | goto out; |
| 1285 | |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1286 | /* To preserve backwards compatibility, the node has choose the outgoing |
| 1287 | * format based on the incoming request packet type. The assumption is |
| 1288 | * 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] | 1289 | */ |
| 1290 | if (hdr_size == sizeof(struct batadv_unicast_4addr_packet)) |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame] | 1291 | err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new, |
| 1292 | BATADV_P_DAT_CACHE_REPLY, |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 1293 | NULL, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1294 | else |
Antonio Quartulli | 6c413b1 | 2013-11-05 19:31:08 +0100 | [diff] [blame] | 1295 | err = batadv_send_skb_via_tt(bat_priv, skb_new, NULL, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1296 | |
Linus Lüssing | e300d31 | 2013-07-03 10:40:00 +0200 | [diff] [blame] | 1297 | if (err != NET_XMIT_DROP) { |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1298 | batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1299 | ret = true; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 1300 | } |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1301 | out: |
| 1302 | if (dat_entry) |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 1303 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1304 | if (ret) |
| 1305 | kfree_skb(skb); |
| 1306 | return ret; |
| 1307 | } |
| 1308 | |
| 1309 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1310 | * batadv_dat_snoop_outgoing_arp_reply() - snoop the ARP reply and fill the DHT |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1311 | * @bat_priv: the bat priv with all the soft interface information |
| 1312 | * @skb: packet to check |
| 1313 | */ |
| 1314 | void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, |
| 1315 | struct sk_buff *skb) |
| 1316 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1317 | u16 type; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1318 | __be32 ip_src, ip_dst; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1319 | u8 *hw_src, *hw_dst; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1320 | int hdr_size = 0; |
| 1321 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1322 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1323 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1324 | return; |
| 1325 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1326 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1327 | |
| 1328 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1329 | if (type != ARPOP_REPLY) |
| 1330 | return; |
| 1331 | |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 1332 | batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing outgoing ARP REPLY"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1333 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1334 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1335 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1336 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1337 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1338 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1339 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1340 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1341 | |
| 1342 | /* 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] | 1343 | * the node obtained from the ARP reply |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1344 | */ |
Antonio Quartulli | 2871734 | 2016-03-12 11:12:59 +0100 | [diff] [blame] | 1345 | batadv_dat_send_data(bat_priv, skb, ip_src, vid, BATADV_P_DAT_DHT_PUT); |
| 1346 | batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_PUT); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1347 | } |
Antonio Quartulli | aa143d2 | 2014-09-01 14:37:27 +0200 | [diff] [blame] | 1348 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1349 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1350 | * batadv_dat_snoop_incoming_arp_reply() - snoop the ARP reply and fill the |
| 1351 | * local DAT storage only |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1352 | * @bat_priv: the bat priv with all the soft interface information |
| 1353 | * @skb: packet to check |
Marek Lindner | 9317801 | 2013-03-10 19:29:15 +0800 | [diff] [blame] | 1354 | * @hdr_size: size of the encapsulation header |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1355 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1356 | * Return: true if the packet was snooped and consumed by DAT. False if the |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1357 | * packet has to be delivered to the interface |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1358 | */ |
| 1359 | bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, |
| 1360 | struct sk_buff *skb, int hdr_size) |
| 1361 | { |
Andreas Pape | 9aa5cd7 | 2016-09-05 13:20:26 +0200 | [diff] [blame] | 1362 | struct batadv_dat_entry *dat_entry = NULL; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1363 | u16 type; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1364 | __be32 ip_src, ip_dst; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1365 | u8 *hw_src, *hw_dst; |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1366 | bool dropped = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1367 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1368 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1369 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1370 | goto out; |
| 1371 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1372 | vid = batadv_dat_get_vid(skb, &hdr_size); |
| 1373 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1374 | type = batadv_arp_get_type(bat_priv, skb, hdr_size); |
| 1375 | if (type != ARPOP_REPLY) |
| 1376 | goto out; |
| 1377 | |
Antonio Quartulli | 843314c | 2016-09-25 08:46:36 +0800 | [diff] [blame] | 1378 | batadv_dbg_arp(bat_priv, skb, hdr_size, "Parsing incoming ARP REPLY"); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1379 | |
| 1380 | hw_src = batadv_arp_hw_src(skb, hdr_size); |
| 1381 | ip_src = batadv_arp_ip_src(skb, hdr_size); |
| 1382 | hw_dst = batadv_arp_hw_dst(skb, hdr_size); |
| 1383 | ip_dst = batadv_arp_ip_dst(skb, hdr_size); |
| 1384 | |
Andreas Pape | 9aa5cd7 | 2016-09-05 13:20:26 +0200 | [diff] [blame] | 1385 | /* If ip_dst is already in cache and has the right mac address, |
| 1386 | * drop this frame if this ARP reply is destined for us because it's |
| 1387 | * most probably an ARP reply generated by another node of the DHT. |
| 1388 | * We have most probably received already a reply earlier. Delivering |
| 1389 | * this frame would lead to doubled receive of an ARP reply. |
| 1390 | */ |
| 1391 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_src, vid); |
| 1392 | if (dat_entry && batadv_compare_eth(hw_src, dat_entry->mac_addr)) { |
| 1393 | batadv_dbg(BATADV_DBG_DAT, bat_priv, "Doubled ARP reply removed: ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]; dat_entry: %pM-%pI4\n", |
| 1394 | hw_src, &ip_src, hw_dst, &ip_dst, |
| 1395 | dat_entry->mac_addr, &dat_entry->ip); |
| 1396 | dropped = true; |
| 1397 | goto out; |
| 1398 | } |
| 1399 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1400 | /* Update our internal cache with both the IP addresses the node got |
| 1401 | * within the ARP reply |
| 1402 | */ |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1403 | batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid); |
| 1404 | batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1405 | |
Andreas Pape | 9aa5cd7 | 2016-09-05 13:20:26 +0200 | [diff] [blame] | 1406 | /* If BLA is enabled, only forward ARP replies if we have claimed the |
| 1407 | * source of the ARP reply or if no one else of the same backbone has |
| 1408 | * already claimed that client. This prevents that different gateways |
| 1409 | * to the same backbone all forward the ARP reply leading to multiple |
| 1410 | * replies in the backbone. |
| 1411 | */ |
| 1412 | if (!batadv_bla_check_claim(bat_priv, hw_src, vid)) { |
| 1413 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1414 | "Device %pM claimed by another backbone gw. Drop ARP reply.\n", |
| 1415 | hw_src); |
| 1416 | dropped = true; |
| 1417 | goto out; |
| 1418 | } |
| 1419 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1420 | /* if this REPLY is directed to a client of mine, let's deliver the |
| 1421 | * packet to the interface |
| 1422 | */ |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1423 | dropped = !batadv_is_my_client(bat_priv, hw_dst, vid); |
| 1424 | |
| 1425 | /* if this REPLY is sent on behalf of a client of mine, let's drop the |
| 1426 | * packet because the client will reply by itself |
| 1427 | */ |
| 1428 | dropped |= batadv_is_my_client(bat_priv, hw_src, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1429 | out: |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1430 | if (dropped) |
Matthias Schiffer | 0d15bec | 2013-01-23 18:11:53 +0100 | [diff] [blame] | 1431 | kfree_skb(skb); |
Andreas Pape | 9aa5cd7 | 2016-09-05 13:20:26 +0200 | [diff] [blame] | 1432 | if (dat_entry) |
| 1433 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | f202a66 | 2015-06-16 21:06:24 +0200 | [diff] [blame] | 1434 | /* if dropped == false -> deliver to the interface */ |
| 1435 | return dropped; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1436 | } |
| 1437 | |
| 1438 | /** |
Sven Eckelmann | 7e9a8c2 | 2017-12-02 19:51:47 +0100 | [diff] [blame] | 1439 | * batadv_dat_drop_broadcast_packet() - check if an ARP request has to be |
| 1440 | * dropped (because the node has already obtained the reply via DAT) or not |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1441 | * @bat_priv: the bat priv with all the soft interface information |
| 1442 | * @forw_packet: the broadcast packet |
| 1443 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 1444 | * Return: true if the node can drop the packet, false otherwise. |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1445 | */ |
| 1446 | bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, |
| 1447 | struct batadv_forw_packet *forw_packet) |
| 1448 | { |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1449 | u16 type; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1450 | __be32 ip_dst; |
| 1451 | struct batadv_dat_entry *dat_entry = NULL; |
| 1452 | bool ret = false; |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1453 | int hdr_size = sizeof(struct batadv_bcast_packet); |
| 1454 | unsigned short vid; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1455 | |
Antonio Quartulli | 33af49a | 2012-08-08 18:50:57 +0200 | [diff] [blame] | 1456 | if (!atomic_read(&bat_priv->distributed_arp_table)) |
| 1457 | goto out; |
| 1458 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1459 | /* If this packet is an ARP_REQUEST and the node already has the |
| 1460 | * information that it is going to ask, then the packet can be dropped |
| 1461 | */ |
Linus Lüssing | e2d9ba4 | 2017-02-17 11:17:07 +0100 | [diff] [blame] | 1462 | if (batadv_forw_packet_is_rebroadcast(forw_packet)) |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1463 | goto out; |
| 1464 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1465 | vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size); |
| 1466 | |
| 1467 | type = batadv_arp_get_type(bat_priv, forw_packet->skb, hdr_size); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1468 | if (type != ARPOP_REQUEST) |
| 1469 | goto out; |
| 1470 | |
Antonio Quartulli | be1db4f | 2013-06-04 12:11:43 +0200 | [diff] [blame] | 1471 | ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size); |
| 1472 | dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1473 | /* check if the node already got this entry */ |
| 1474 | if (!dat_entry) { |
| 1475 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1476 | "ARP Request for %pI4: fallback\n", &ip_dst); |
| 1477 | goto out; |
| 1478 | } |
| 1479 | |
| 1480 | batadv_dbg(BATADV_DBG_DAT, bat_priv, |
| 1481 | "ARP Request for %pI4: fallback prevented\n", &ip_dst); |
| 1482 | ret = true; |
| 1483 | |
| 1484 | out: |
| 1485 | if (dat_entry) |
Sven Eckelmann | a6416f9 | 2016-01-17 11:01:17 +0100 | [diff] [blame] | 1486 | batadv_dat_entry_put(dat_entry); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1487 | return ret; |
| 1488 | } |