Different hashes have the same class key because they get initialised with the same one. For this reason lockdep can create false warning when they are used recursively. Re-initialise the key for each hash after the invocation to hash_new() to avoid this problem. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Tested-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
947 lines
26 KiB
C
947 lines
26 KiB
C
/* Copyright (C) 2008-2012 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "main.h"
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#include "send.h"
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#include "translation-table.h"
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#include "vis.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "hash.h"
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#include "originator.h"
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#define BATADV_MAX_VIS_PACKET_SIZE 1000
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/* hash class keys */
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static struct lock_class_key batadv_vis_hash_lock_class_key;
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static void batadv_start_vis_timer(struct batadv_priv *bat_priv);
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/* free the info */
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static void batadv_free_info(struct kref *ref)
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{
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struct batadv_vis_info *info;
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struct batadv_priv *bat_priv;
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struct batadv_recvlist_node *entry, *tmp;
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info = container_of(ref, struct batadv_vis_info, refcount);
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bat_priv = info->bat_priv;
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list_del_init(&info->send_list);
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spin_lock_bh(&bat_priv->vis.list_lock);
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list_for_each_entry_safe(entry, tmp, &info->recv_list, list) {
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list_del(&entry->list);
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kfree(entry);
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}
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spin_unlock_bh(&bat_priv->vis.list_lock);
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kfree_skb(info->skb_packet);
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kfree(info);
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}
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/* Compare two vis packets, used by the hashing algorithm */
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static int batadv_vis_info_cmp(const struct hlist_node *node, const void *data2)
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{
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const struct batadv_vis_info *d1, *d2;
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const struct batadv_vis_packet *p1, *p2;
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d1 = container_of(node, struct batadv_vis_info, hash_entry);
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d2 = data2;
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p1 = (struct batadv_vis_packet *)d1->skb_packet->data;
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p2 = (struct batadv_vis_packet *)d2->skb_packet->data;
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return batadv_compare_eth(p1->vis_orig, p2->vis_orig);
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}
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/* hash function to choose an entry in a hash table of given size
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* hash algorithm from http://en.wikipedia.org/wiki/Hash_table
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*/
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static uint32_t batadv_vis_info_choose(const void *data, uint32_t size)
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{
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const struct batadv_vis_info *vis_info = data;
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const struct batadv_vis_packet *packet;
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const unsigned char *key;
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uint32_t hash = 0;
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size_t i;
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packet = (struct batadv_vis_packet *)vis_info->skb_packet->data;
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key = packet->vis_orig;
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for (i = 0; i < ETH_ALEN; i++) {
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hash += key[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash % size;
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}
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static struct batadv_vis_info *
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batadv_vis_hash_find(struct batadv_priv *bat_priv, const void *data)
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{
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struct batadv_hashtable *hash = bat_priv->vis.hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct batadv_vis_info *vis_info, *vis_info_tmp = NULL;
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uint32_t index;
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if (!hash)
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return NULL;
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index = batadv_vis_info_choose(data, hash->size);
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head = &hash->table[index];
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rcu_read_lock();
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hlist_for_each_entry_rcu(vis_info, node, head, hash_entry) {
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if (!batadv_vis_info_cmp(node, data))
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continue;
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vis_info_tmp = vis_info;
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break;
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}
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rcu_read_unlock();
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return vis_info_tmp;
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}
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/* insert interface to the list of interfaces of one originator, if it
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* does not already exist in the list
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*/
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static void batadv_vis_data_insert_interface(const uint8_t *interface,
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struct hlist_head *if_list,
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bool primary)
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{
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struct batadv_if_list_entry *entry;
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struct hlist_node *pos;
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hlist_for_each_entry(entry, pos, if_list, list) {
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if (batadv_compare_eth(entry->addr, interface))
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return;
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}
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/* it's a new address, add it to the list */
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
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if (!entry)
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return;
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memcpy(entry->addr, interface, ETH_ALEN);
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entry->primary = primary;
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hlist_add_head(&entry->list, if_list);
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}
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static void batadv_vis_data_read_prim_sec(struct seq_file *seq,
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const struct hlist_head *if_list)
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{
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struct batadv_if_list_entry *entry;
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struct hlist_node *pos;
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hlist_for_each_entry(entry, pos, if_list, list) {
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if (entry->primary)
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seq_printf(seq, "PRIMARY, ");
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else
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seq_printf(seq, "SEC %pM, ", entry->addr);
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}
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}
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/* read an entry */
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static ssize_t
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batadv_vis_data_read_entry(struct seq_file *seq,
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const struct batadv_vis_info_entry *entry,
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const uint8_t *src, bool primary)
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{
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if (primary && entry->quality == 0)
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return seq_printf(seq, "TT %pM, ", entry->dest);
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else if (batadv_compare_eth(entry->src, src))
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return seq_printf(seq, "TQ %pM %d, ", entry->dest,
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entry->quality);
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return 0;
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}
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static void
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batadv_vis_data_insert_interfaces(struct hlist_head *list,
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struct batadv_vis_packet *packet,
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struct batadv_vis_info_entry *entries)
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{
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int i;
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for (i = 0; i < packet->entries; i++) {
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if (entries[i].quality == 0)
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continue;
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if (batadv_compare_eth(entries[i].src, packet->vis_orig))
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continue;
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batadv_vis_data_insert_interface(entries[i].src, list, false);
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}
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}
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static void batadv_vis_data_read_entries(struct seq_file *seq,
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struct hlist_head *list,
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struct batadv_vis_packet *packet,
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struct batadv_vis_info_entry *entries)
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{
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int i;
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struct batadv_if_list_entry *entry;
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struct hlist_node *pos;
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hlist_for_each_entry(entry, pos, list, list) {
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seq_printf(seq, "%pM,", entry->addr);
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for (i = 0; i < packet->entries; i++)
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batadv_vis_data_read_entry(seq, &entries[i],
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entry->addr, entry->primary);
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/* add primary/secondary records */
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if (batadv_compare_eth(entry->addr, packet->vis_orig))
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batadv_vis_data_read_prim_sec(seq, list);
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seq_printf(seq, "\n");
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}
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}
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static void batadv_vis_seq_print_text_bucket(struct seq_file *seq,
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const struct hlist_head *head)
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{
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struct hlist_node *node;
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struct batadv_vis_info *info;
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struct batadv_vis_packet *packet;
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uint8_t *entries_pos;
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struct batadv_vis_info_entry *entries;
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struct batadv_if_list_entry *entry;
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struct hlist_node *pos, *n;
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HLIST_HEAD(vis_if_list);
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hlist_for_each_entry_rcu(info, node, head, hash_entry) {
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packet = (struct batadv_vis_packet *)info->skb_packet->data;
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entries_pos = (uint8_t *)packet + sizeof(*packet);
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entries = (struct batadv_vis_info_entry *)entries_pos;
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batadv_vis_data_insert_interface(packet->vis_orig, &vis_if_list,
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true);
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batadv_vis_data_insert_interfaces(&vis_if_list, packet,
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entries);
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batadv_vis_data_read_entries(seq, &vis_if_list, packet,
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entries);
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hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, list) {
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hlist_del(&entry->list);
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kfree(entry);
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}
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}
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}
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int batadv_vis_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct batadv_hard_iface *primary_if;
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struct hlist_head *head;
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct batadv_priv *bat_priv = netdev_priv(net_dev);
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struct batadv_hashtable *hash = bat_priv->vis.hash;
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uint32_t i;
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int ret = 0;
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int vis_server = atomic_read(&bat_priv->vis_mode);
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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if (vis_server == BATADV_VIS_TYPE_CLIENT_UPDATE)
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goto out;
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spin_lock_bh(&bat_priv->vis.hash_lock);
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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batadv_vis_seq_print_text_bucket(seq, head);
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}
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spin_unlock_bh(&bat_priv->vis.hash_lock);
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out:
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if (primary_if)
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batadv_hardif_free_ref(primary_if);
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return ret;
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}
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/* add the info packet to the send list, if it was not
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* already linked in.
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*/
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static void batadv_send_list_add(struct batadv_priv *bat_priv,
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struct batadv_vis_info *info)
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{
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if (list_empty(&info->send_list)) {
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kref_get(&info->refcount);
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list_add_tail(&info->send_list, &bat_priv->vis.send_list);
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}
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}
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/* delete the info packet from the send list, if it was
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* linked in.
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*/
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static void batadv_send_list_del(struct batadv_vis_info *info)
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{
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if (!list_empty(&info->send_list)) {
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list_del_init(&info->send_list);
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kref_put(&info->refcount, batadv_free_info);
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}
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}
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/* tries to add one entry to the receive list. */
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static void batadv_recv_list_add(struct batadv_priv *bat_priv,
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struct list_head *recv_list, const char *mac)
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{
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struct batadv_recvlist_node *entry;
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
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if (!entry)
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return;
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memcpy(entry->mac, mac, ETH_ALEN);
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spin_lock_bh(&bat_priv->vis.list_lock);
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list_add_tail(&entry->list, recv_list);
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spin_unlock_bh(&bat_priv->vis.list_lock);
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}
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/* returns 1 if this mac is in the recv_list */
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static int batadv_recv_list_is_in(struct batadv_priv *bat_priv,
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const struct list_head *recv_list,
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const char *mac)
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{
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const struct batadv_recvlist_node *entry;
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spin_lock_bh(&bat_priv->vis.list_lock);
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list_for_each_entry(entry, recv_list, list) {
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if (batadv_compare_eth(entry->mac, mac)) {
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spin_unlock_bh(&bat_priv->vis.list_lock);
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return 1;
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}
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}
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spin_unlock_bh(&bat_priv->vis.list_lock);
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return 0;
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}
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/* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old,
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* broken.. ). vis hash must be locked outside. is_new is set when the packet
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* is newer than old entries in the hash.
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*/
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static struct batadv_vis_info *
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batadv_add_packet(struct batadv_priv *bat_priv,
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struct batadv_vis_packet *vis_packet, int vis_info_len,
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int *is_new, int make_broadcast)
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{
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struct batadv_vis_info *info, *old_info;
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struct batadv_vis_packet *search_packet, *old_packet;
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struct batadv_vis_info search_elem;
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struct batadv_vis_packet *packet;
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struct sk_buff *tmp_skb;
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int hash_added;
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size_t len;
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size_t max_entries;
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*is_new = 0;
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/* sanity check */
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if (!bat_priv->vis.hash)
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return NULL;
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/* see if the packet is already in vis_hash */
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search_elem.skb_packet = dev_alloc_skb(sizeof(*search_packet));
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if (!search_elem.skb_packet)
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return NULL;
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len = sizeof(*search_packet);
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tmp_skb = search_elem.skb_packet;
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search_packet = (struct batadv_vis_packet *)skb_put(tmp_skb, len);
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memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN);
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old_info = batadv_vis_hash_find(bat_priv, &search_elem);
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kfree_skb(search_elem.skb_packet);
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if (old_info) {
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tmp_skb = old_info->skb_packet;
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old_packet = (struct batadv_vis_packet *)tmp_skb->data;
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if (!batadv_seq_after(ntohl(vis_packet->seqno),
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ntohl(old_packet->seqno))) {
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if (old_packet->seqno == vis_packet->seqno) {
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batadv_recv_list_add(bat_priv,
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&old_info->recv_list,
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vis_packet->sender_orig);
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return old_info;
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} else {
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/* newer packet is already in hash. */
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return NULL;
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}
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}
|
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/* remove old entry */
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batadv_hash_remove(bat_priv->vis.hash, batadv_vis_info_cmp,
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batadv_vis_info_choose, old_info);
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batadv_send_list_del(old_info);
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kref_put(&old_info->refcount, batadv_free_info);
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}
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|
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info = kmalloc(sizeof(*info), GFP_ATOMIC);
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if (!info)
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return NULL;
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len = sizeof(*packet) + vis_info_len;
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info->skb_packet = dev_alloc_skb(len + ETH_HLEN + NET_IP_ALIGN);
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if (!info->skb_packet) {
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kfree(info);
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return NULL;
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}
|
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skb_reserve(info->skb_packet, ETH_HLEN + NET_IP_ALIGN);
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packet = (struct batadv_vis_packet *)skb_put(info->skb_packet, len);
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|
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kref_init(&info->refcount);
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INIT_LIST_HEAD(&info->send_list);
|
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INIT_LIST_HEAD(&info->recv_list);
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info->first_seen = jiffies;
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info->bat_priv = bat_priv;
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memcpy(packet, vis_packet, len);
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|
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/* initialize and add new packet. */
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*is_new = 1;
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|
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/* Make it a broadcast packet, if required */
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if (make_broadcast)
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memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
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|
|
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/* repair if entries is longer than packet. */
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max_entries = vis_info_len / sizeof(struct batadv_vis_info_entry);
|
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if (packet->entries > max_entries)
|
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packet->entries = max_entries;
|
|
|
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batadv_recv_list_add(bat_priv, &info->recv_list, packet->sender_orig);
|
|
|
|
/* try to add it */
|
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hash_added = batadv_hash_add(bat_priv->vis.hash, batadv_vis_info_cmp,
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batadv_vis_info_choose, info,
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&info->hash_entry);
|
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if (hash_added != 0) {
|
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/* did not work (for some reason) */
|
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kref_put(&info->refcount, batadv_free_info);
|
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info = NULL;
|
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}
|
|
|
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return info;
|
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}
|
|
|
|
/* handle the server sync packet, forward if needed. */
|
|
void batadv_receive_server_sync_packet(struct batadv_priv *bat_priv,
|
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struct batadv_vis_packet *vis_packet,
|
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int vis_info_len)
|
|
{
|
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struct batadv_vis_info *info;
|
|
int is_new, make_broadcast;
|
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int vis_server = atomic_read(&bat_priv->vis_mode);
|
|
|
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make_broadcast = (vis_server == BATADV_VIS_TYPE_SERVER_SYNC);
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|
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spin_lock_bh(&bat_priv->vis.hash_lock);
|
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info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
|
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&is_new, make_broadcast);
|
|
if (!info)
|
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goto end;
|
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|
|
/* only if we are server ourselves and packet is newer than the one in
|
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* hash.
|
|
*/
|
|
if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC && is_new)
|
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batadv_send_list_add(bat_priv, info);
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end:
|
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spin_unlock_bh(&bat_priv->vis.hash_lock);
|
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}
|
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|
|
/* handle an incoming client update packet and schedule forward if needed. */
|
|
void batadv_receive_client_update_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_vis_packet *vis_packet,
|
|
int vis_info_len)
|
|
{
|
|
struct batadv_vis_info *info;
|
|
struct batadv_vis_packet *packet;
|
|
int is_new;
|
|
int vis_server = atomic_read(&bat_priv->vis_mode);
|
|
int are_target = 0;
|
|
|
|
/* clients shall not broadcast. */
|
|
if (is_broadcast_ether_addr(vis_packet->target_orig))
|
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return;
|
|
|
|
/* Are we the target for this VIS packet? */
|
|
if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC &&
|
|
batadv_is_my_mac(vis_packet->target_orig))
|
|
are_target = 1;
|
|
|
|
spin_lock_bh(&bat_priv->vis.hash_lock);
|
|
info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
|
|
&is_new, are_target);
|
|
|
|
if (!info)
|
|
goto end;
|
|
/* note that outdated packets will be dropped at this point. */
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
|
|
/* send only if we're the target server or ... */
|
|
if (are_target && is_new) {
|
|
packet->vis_type = BATADV_VIS_TYPE_SERVER_SYNC; /* upgrade! */
|
|
batadv_send_list_add(bat_priv, info);
|
|
|
|
/* ... we're not the recipient (and thus need to forward). */
|
|
} else if (!batadv_is_my_mac(packet->target_orig)) {
|
|
batadv_send_list_add(bat_priv, info);
|
|
}
|
|
|
|
end:
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
}
|
|
|
|
/* Walk the originators and find the VIS server with the best tq. Set the packet
|
|
* address to its address and return the best_tq.
|
|
*
|
|
* Must be called with the originator hash locked
|
|
*/
|
|
static int batadv_find_best_vis_server(struct batadv_priv *bat_priv,
|
|
struct batadv_vis_info *info)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct batadv_neigh_node *router;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_vis_packet *packet;
|
|
int best_tq = -1;
|
|
uint32_t i;
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (!router)
|
|
continue;
|
|
|
|
if ((orig_node->flags & BATADV_VIS_SERVER) &&
|
|
(router->tq_avg > best_tq)) {
|
|
best_tq = router->tq_avg;
|
|
memcpy(packet->target_orig, orig_node->orig,
|
|
ETH_ALEN);
|
|
}
|
|
batadv_neigh_node_free_ref(router);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return best_tq;
|
|
}
|
|
|
|
/* Return true if the vis packet is full. */
|
|
static bool batadv_vis_packet_full(const struct batadv_vis_info *info)
|
|
{
|
|
const struct batadv_vis_packet *packet;
|
|
size_t num;
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
num = BATADV_MAX_VIS_PACKET_SIZE / sizeof(struct batadv_vis_info_entry);
|
|
|
|
if (num < packet->entries + 1)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/* generates a packet of own vis data,
|
|
* returns 0 on success, -1 if no packet could be generated
|
|
*/
|
|
static int batadv_generate_vis_packet(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_neigh_node *router;
|
|
struct batadv_vis_info *info = bat_priv->vis.my_info;
|
|
struct batadv_vis_packet *packet;
|
|
struct batadv_vis_info_entry *entry;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
uint8_t *packet_pos;
|
|
int best_tq = -1;
|
|
uint32_t i;
|
|
|
|
info->first_seen = jiffies;
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
packet->vis_type = atomic_read(&bat_priv->vis_mode);
|
|
|
|
memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
|
|
packet->header.ttl = BATADV_TTL;
|
|
packet->seqno = htonl(ntohl(packet->seqno) + 1);
|
|
packet->entries = 0;
|
|
packet->reserved = 0;
|
|
skb_trim(info->skb_packet, sizeof(*packet));
|
|
|
|
if (packet->vis_type == BATADV_VIS_TYPE_CLIENT_UPDATE) {
|
|
best_tq = batadv_find_best_vis_server(bat_priv, info);
|
|
|
|
if (best_tq < 0)
|
|
return best_tq;
|
|
}
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (!router)
|
|
continue;
|
|
|
|
if (!batadv_compare_eth(router->addr, orig_node->orig))
|
|
goto next;
|
|
|
|
if (router->if_incoming->if_status != BATADV_IF_ACTIVE)
|
|
goto next;
|
|
|
|
if (router->tq_avg < 1)
|
|
goto next;
|
|
|
|
/* fill one entry into buffer. */
|
|
packet_pos = skb_put(info->skb_packet, sizeof(*entry));
|
|
entry = (struct batadv_vis_info_entry *)packet_pos;
|
|
memcpy(entry->src,
|
|
router->if_incoming->net_dev->dev_addr,
|
|
ETH_ALEN);
|
|
memcpy(entry->dest, orig_node->orig, ETH_ALEN);
|
|
entry->quality = router->tq_avg;
|
|
packet->entries++;
|
|
|
|
next:
|
|
batadv_neigh_node_free_ref(router);
|
|
|
|
if (batadv_vis_packet_full(info))
|
|
goto unlock;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
hash = bat_priv->tt.local_hash;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry, node, head,
|
|
hash_entry) {
|
|
packet_pos = skb_put(info->skb_packet, sizeof(*entry));
|
|
entry = (struct batadv_vis_info_entry *)packet_pos;
|
|
memset(entry->src, 0, ETH_ALEN);
|
|
memcpy(entry->dest, tt_common_entry->addr, ETH_ALEN);
|
|
entry->quality = 0; /* 0 means TT */
|
|
packet->entries++;
|
|
|
|
if (batadv_vis_packet_full(info))
|
|
goto unlock;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return 0;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
/* free old vis packets. Must be called with this vis_hash_lock
|
|
* held
|
|
*/
|
|
static void batadv_purge_vis_packets(struct batadv_priv *bat_priv)
|
|
{
|
|
uint32_t i;
|
|
struct batadv_hashtable *hash = bat_priv->vis.hash;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
struct batadv_vis_info *info;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
hlist_for_each_entry_safe(info, node, node_tmp,
|
|
head, hash_entry) {
|
|
/* never purge own data. */
|
|
if (info == bat_priv->vis.my_info)
|
|
continue;
|
|
|
|
if (batadv_has_timed_out(info->first_seen,
|
|
BATADV_VIS_TIMEOUT)) {
|
|
hlist_del(node);
|
|
batadv_send_list_del(info);
|
|
kref_put(&info->refcount, batadv_free_info);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void batadv_broadcast_vis_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_vis_info *info)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_vis_packet *packet;
|
|
struct sk_buff *skb;
|
|
uint32_t i;
|
|
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
|
|
/* send to all routers in range. */
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
|
/* if it's a vis server and reachable, send it. */
|
|
if (!(orig_node->flags & BATADV_VIS_SERVER))
|
|
continue;
|
|
|
|
/* don't send it if we already received the packet from
|
|
* this node.
|
|
*/
|
|
if (batadv_recv_list_is_in(bat_priv, &info->recv_list,
|
|
orig_node->orig))
|
|
continue;
|
|
|
|
memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
|
|
skb = skb_clone(info->skb_packet, GFP_ATOMIC);
|
|
if (!skb)
|
|
continue;
|
|
|
|
if (!batadv_send_skb_to_orig(skb, orig_node, NULL))
|
|
kfree_skb(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static void batadv_unicast_vis_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_vis_info *info)
|
|
{
|
|
struct batadv_orig_node *orig_node;
|
|
struct sk_buff *skb;
|
|
struct batadv_vis_packet *packet;
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, packet->target_orig);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
skb = skb_clone(info->skb_packet, GFP_ATOMIC);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
if (!batadv_send_skb_to_orig(skb, orig_node, NULL))
|
|
kfree_skb(skb);
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
/* only send one vis packet. called from batadv_send_vis_packets() */
|
|
static void batadv_send_vis_packet(struct batadv_priv *bat_priv,
|
|
struct batadv_vis_info *info)
|
|
{
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_vis_packet *packet;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
packet = (struct batadv_vis_packet *)info->skb_packet->data;
|
|
if (packet->header.ttl < 2) {
|
|
pr_debug("Error - can't send vis packet: ttl exceeded\n");
|
|
goto out;
|
|
}
|
|
|
|
memcpy(packet->sender_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
packet->header.ttl--;
|
|
|
|
if (is_broadcast_ether_addr(packet->target_orig))
|
|
batadv_broadcast_vis_packet(bat_priv, info);
|
|
else
|
|
batadv_unicast_vis_packet(bat_priv, info);
|
|
packet->header.ttl++; /* restore TTL */
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
/* called from timer; send (and maybe generate) vis packet. */
|
|
static void batadv_send_vis_packets(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_priv_vis *priv_vis;
|
|
struct batadv_vis_info *info;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
priv_vis = container_of(delayed_work, struct batadv_priv_vis, work);
|
|
bat_priv = container_of(priv_vis, struct batadv_priv, vis);
|
|
spin_lock_bh(&bat_priv->vis.hash_lock);
|
|
batadv_purge_vis_packets(bat_priv);
|
|
|
|
if (batadv_generate_vis_packet(bat_priv) == 0) {
|
|
/* schedule if generation was successful */
|
|
batadv_send_list_add(bat_priv, bat_priv->vis.my_info);
|
|
}
|
|
|
|
while (!list_empty(&bat_priv->vis.send_list)) {
|
|
info = list_first_entry(&bat_priv->vis.send_list,
|
|
typeof(*info), send_list);
|
|
|
|
kref_get(&info->refcount);
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
|
|
batadv_send_vis_packet(bat_priv, info);
|
|
|
|
spin_lock_bh(&bat_priv->vis.hash_lock);
|
|
batadv_send_list_del(info);
|
|
kref_put(&info->refcount, batadv_free_info);
|
|
}
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
batadv_start_vis_timer(bat_priv);
|
|
}
|
|
|
|
/* init the vis server. this may only be called when if_list is already
|
|
* initialized (e.g. bat0 is initialized, interfaces have been added)
|
|
*/
|
|
int batadv_vis_init(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_vis_packet *packet;
|
|
int hash_added;
|
|
unsigned int len;
|
|
unsigned long first_seen;
|
|
struct sk_buff *tmp_skb;
|
|
|
|
if (bat_priv->vis.hash)
|
|
return 0;
|
|
|
|
spin_lock_bh(&bat_priv->vis.hash_lock);
|
|
|
|
bat_priv->vis.hash = batadv_hash_new(256);
|
|
if (!bat_priv->vis.hash) {
|
|
pr_err("Can't initialize vis_hash\n");
|
|
goto err;
|
|
}
|
|
|
|
batadv_hash_set_lock_class(bat_priv->vis.hash,
|
|
&batadv_vis_hash_lock_class_key);
|
|
|
|
bat_priv->vis.my_info = kmalloc(BATADV_MAX_VIS_PACKET_SIZE, GFP_ATOMIC);
|
|
if (!bat_priv->vis.my_info)
|
|
goto err;
|
|
|
|
len = sizeof(*packet) + BATADV_MAX_VIS_PACKET_SIZE;
|
|
len += ETH_HLEN + NET_IP_ALIGN;
|
|
bat_priv->vis.my_info->skb_packet = dev_alloc_skb(len);
|
|
if (!bat_priv->vis.my_info->skb_packet)
|
|
goto free_info;
|
|
|
|
skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN + NET_IP_ALIGN);
|
|
tmp_skb = bat_priv->vis.my_info->skb_packet;
|
|
packet = (struct batadv_vis_packet *)skb_put(tmp_skb, sizeof(*packet));
|
|
|
|
/* prefill the vis info */
|
|
first_seen = jiffies - msecs_to_jiffies(BATADV_VIS_INTERVAL);
|
|
bat_priv->vis.my_info->first_seen = first_seen;
|
|
INIT_LIST_HEAD(&bat_priv->vis.my_info->recv_list);
|
|
INIT_LIST_HEAD(&bat_priv->vis.my_info->send_list);
|
|
kref_init(&bat_priv->vis.my_info->refcount);
|
|
bat_priv->vis.my_info->bat_priv = bat_priv;
|
|
packet->header.version = BATADV_COMPAT_VERSION;
|
|
packet->header.packet_type = BATADV_VIS;
|
|
packet->header.ttl = BATADV_TTL;
|
|
packet->seqno = 0;
|
|
packet->reserved = 0;
|
|
packet->entries = 0;
|
|
|
|
INIT_LIST_HEAD(&bat_priv->vis.send_list);
|
|
|
|
hash_added = batadv_hash_add(bat_priv->vis.hash, batadv_vis_info_cmp,
|
|
batadv_vis_info_choose,
|
|
bat_priv->vis.my_info,
|
|
&bat_priv->vis.my_info->hash_entry);
|
|
if (hash_added != 0) {
|
|
pr_err("Can't add own vis packet into hash\n");
|
|
/* not in hash, need to remove it manually. */
|
|
kref_put(&bat_priv->vis.my_info->refcount, batadv_free_info);
|
|
goto err;
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
batadv_start_vis_timer(bat_priv);
|
|
return 0;
|
|
|
|
free_info:
|
|
kfree(bat_priv->vis.my_info);
|
|
bat_priv->vis.my_info = NULL;
|
|
err:
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
batadv_vis_quit(bat_priv);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Decrease the reference count on a hash item info */
|
|
static void batadv_free_info_ref(struct hlist_node *node, void *arg)
|
|
{
|
|
struct batadv_vis_info *info;
|
|
|
|
info = container_of(node, struct batadv_vis_info, hash_entry);
|
|
batadv_send_list_del(info);
|
|
kref_put(&info->refcount, batadv_free_info);
|
|
}
|
|
|
|
/* shutdown vis-server */
|
|
void batadv_vis_quit(struct batadv_priv *bat_priv)
|
|
{
|
|
if (!bat_priv->vis.hash)
|
|
return;
|
|
|
|
cancel_delayed_work_sync(&bat_priv->vis.work);
|
|
|
|
spin_lock_bh(&bat_priv->vis.hash_lock);
|
|
/* properly remove, kill timers ... */
|
|
batadv_hash_delete(bat_priv->vis.hash, batadv_free_info_ref, NULL);
|
|
bat_priv->vis.hash = NULL;
|
|
bat_priv->vis.my_info = NULL;
|
|
spin_unlock_bh(&bat_priv->vis.hash_lock);
|
|
}
|
|
|
|
/* schedule packets for (re)transmission */
|
|
static void batadv_start_vis_timer(struct batadv_priv *bat_priv)
|
|
{
|
|
INIT_DELAYED_WORK(&bat_priv->vis.work, batadv_send_vis_packets);
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->vis.work,
|
|
msecs_to_jiffies(BATADV_VIS_INTERVAL));
|
|
}
|