Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
1699 lines
46 KiB
C
1699 lines
46 KiB
C
/* Copyright (C) 2011-2013 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 "hash.h"
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#include "hard-interface.h"
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#include "originator.h"
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#include "bridge_loop_avoidance.h"
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#include "translation-table.h"
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#include "send.h"
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#include <linux/etherdevice.h>
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#include <linux/crc16.h>
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#include <linux/if_arp.h>
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#include <net/arp.h>
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#include <linux/if_vlan.h>
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static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
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static void batadv_bla_periodic_work(struct work_struct *work);
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static void
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batadv_bla_send_announce(struct batadv_priv *bat_priv,
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struct batadv_bla_backbone_gw *backbone_gw);
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/* return the index of the claim */
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static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
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{
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struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
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uint32_t hash = 0;
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hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
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hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
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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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/* return the index of the backbone gateway */
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static inline uint32_t batadv_choose_backbone_gw(const void *data,
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uint32_t size)
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{
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const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
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uint32_t hash = 0;
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hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
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hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
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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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/* compares address and vid of two backbone gws */
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static int batadv_compare_backbone_gw(const struct hlist_node *node,
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const void *data2)
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{
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const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
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hash_entry);
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const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
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if (!batadv_compare_eth(gw1->orig, gw2->orig))
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return 0;
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if (gw1->vid != gw2->vid)
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return 0;
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return 1;
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}
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/* compares address and vid of two claims */
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static int batadv_compare_claim(const struct hlist_node *node,
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const void *data2)
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{
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const void *data1 = container_of(node, struct batadv_bla_claim,
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hash_entry);
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const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
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if (!batadv_compare_eth(cl1->addr, cl2->addr))
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return 0;
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if (cl1->vid != cl2->vid)
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return 0;
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return 1;
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}
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/* free a backbone gw */
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static void
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batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
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{
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if (atomic_dec_and_test(&backbone_gw->refcount))
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kfree_rcu(backbone_gw, rcu);
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}
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/* finally deinitialize the claim */
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static void batadv_claim_free_rcu(struct rcu_head *rcu)
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{
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struct batadv_bla_claim *claim;
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claim = container_of(rcu, struct batadv_bla_claim, rcu);
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batadv_backbone_gw_free_ref(claim->backbone_gw);
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kfree(claim);
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}
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/* free a claim, call claim_free_rcu if its the last reference */
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static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
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{
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if (atomic_dec_and_test(&claim->refcount))
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call_rcu(&claim->rcu, batadv_claim_free_rcu);
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}
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/* @bat_priv: the bat priv with all the soft interface information
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* @data: search data (may be local/static data)
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*
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* looks for a claim in the hash, and returns it if found
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* or NULL otherwise.
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*/
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static struct batadv_bla_claim
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*batadv_claim_hash_find(struct batadv_priv *bat_priv,
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struct batadv_bla_claim *data)
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{
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struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct batadv_bla_claim *claim;
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struct batadv_bla_claim *claim_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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index = batadv_choose_claim(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(claim, node, head, hash_entry) {
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if (!batadv_compare_claim(&claim->hash_entry, data))
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continue;
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if (!atomic_inc_not_zero(&claim->refcount))
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continue;
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claim_tmp = claim;
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break;
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}
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rcu_read_unlock();
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return claim_tmp;
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}
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/**
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* batadv_backbone_hash_find - looks for a claim in the hash
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the address of the originator
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* @vid: the VLAN ID
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*
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* Returns claim if found or NULL otherwise.
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*/
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static struct batadv_bla_backbone_gw *
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batadv_backbone_hash_find(struct batadv_priv *bat_priv,
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uint8_t *addr, short vid)
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{
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struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct batadv_bla_backbone_gw search_entry, *backbone_gw;
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struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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memcpy(search_entry.orig, addr, ETH_ALEN);
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search_entry.vid = vid;
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index = batadv_choose_backbone_gw(&search_entry, 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(backbone_gw, node, head, hash_entry) {
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if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
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&search_entry))
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continue;
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if (!atomic_inc_not_zero(&backbone_gw->refcount))
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continue;
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backbone_gw_tmp = backbone_gw;
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break;
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}
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rcu_read_unlock();
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return backbone_gw_tmp;
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}
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/* delete all claims for a backbone */
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static void
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batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
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{
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struct batadv_hashtable *hash;
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struct hlist_node *node, *node_tmp;
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struct hlist_head *head;
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struct batadv_bla_claim *claim;
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int i;
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spinlock_t *list_lock; /* protects write access to the hash lists */
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hash = backbone_gw->bat_priv->bla.claim_hash;
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if (!hash)
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return;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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list_lock = &hash->list_locks[i];
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spin_lock_bh(list_lock);
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hlist_for_each_entry_safe(claim, node, node_tmp,
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head, hash_entry) {
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if (claim->backbone_gw != backbone_gw)
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continue;
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batadv_claim_free_ref(claim);
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hlist_del_rcu(node);
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}
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spin_unlock_bh(list_lock);
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}
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/* all claims gone, intialize CRC */
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backbone_gw->crc = BATADV_BLA_CRC_INIT;
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}
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/**
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* batadv_bla_send_claim - sends a claim frame according to the provided info
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* @bat_priv: the bat priv with all the soft interface information
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* @orig: the mac address to be announced within the claim
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* @vid: the VLAN ID
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* @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
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*/
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static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
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short vid, int claimtype)
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{
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struct sk_buff *skb;
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struct ethhdr *ethhdr;
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struct batadv_hard_iface *primary_if;
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struct net_device *soft_iface;
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uint8_t *hw_src;
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struct batadv_bla_claim_dst local_claim_dest;
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__be32 zeroip = 0;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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return;
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memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
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sizeof(local_claim_dest));
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local_claim_dest.type = claimtype;
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soft_iface = primary_if->soft_iface;
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skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
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/* IP DST: 0.0.0.0 */
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zeroip,
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primary_if->soft_iface,
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/* IP SRC: 0.0.0.0 */
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zeroip,
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/* Ethernet DST: Broadcast */
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NULL,
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/* Ethernet SRC/HW SRC: originator mac */
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primary_if->net_dev->dev_addr,
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/* HW DST: FF:43:05:XX:YY:YY
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* with XX = claim type
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* and YY:YY = group id
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*/
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(uint8_t *)&local_claim_dest);
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if (!skb)
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goto out;
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ethhdr = (struct ethhdr *)skb->data;
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hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
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/* now we pretend that the client would have sent this ... */
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switch (claimtype) {
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case BATADV_CLAIM_TYPE_CLAIM:
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/* normal claim frame
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* set Ethernet SRC to the clients mac
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*/
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memcpy(ethhdr->h_source, mac, ETH_ALEN);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid);
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break;
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case BATADV_CLAIM_TYPE_UNCLAIM:
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/* unclaim frame
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* set HW SRC to the clients mac
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*/
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memcpy(hw_src, mac, ETH_ALEN);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
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vid);
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break;
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case BATADV_CLAIM_TYPE_ANNOUNCE:
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/* announcement frame
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* set HW SRC to the special mac containg the crc
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*/
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memcpy(hw_src, mac, ETH_ALEN);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
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ethhdr->h_source, vid);
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break;
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case BATADV_CLAIM_TYPE_REQUEST:
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/* request frame
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* set HW SRC and header destination to the receiving backbone
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* gws mac
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*/
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memcpy(hw_src, mac, ETH_ALEN);
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memcpy(ethhdr->h_dest, mac, ETH_ALEN);
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
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ethhdr->h_source, ethhdr->h_dest, vid);
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break;
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}
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if (vid != -1)
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skb = vlan_insert_tag(skb, vid);
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skb_reset_mac_header(skb);
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skb->protocol = eth_type_trans(skb, soft_iface);
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batadv_inc_counter(bat_priv, BATADV_CNT_RX);
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batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
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skb->len + ETH_HLEN);
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soft_iface->last_rx = jiffies;
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netif_rx(skb);
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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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}
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/**
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* batadv_bla_get_backbone_gw
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* @bat_priv: the bat priv with all the soft interface information
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* @orig: the mac address of the originator
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* @vid: the VLAN ID
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*
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* searches for the backbone gw or creates a new one if it could not
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* be found.
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*/
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static struct batadv_bla_backbone_gw *
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batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
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short vid, bool own_backbone)
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{
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struct batadv_bla_backbone_gw *entry;
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struct batadv_orig_node *orig_node;
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int hash_added;
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entry = batadv_backbone_hash_find(bat_priv, orig, vid);
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if (entry)
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return entry;
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
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orig, vid);
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
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if (!entry)
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return NULL;
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entry->vid = vid;
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entry->lasttime = jiffies;
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entry->crc = BATADV_BLA_CRC_INIT;
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entry->bat_priv = bat_priv;
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atomic_set(&entry->request_sent, 0);
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atomic_set(&entry->wait_periods, 0);
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memcpy(entry->orig, orig, ETH_ALEN);
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/* one for the hash, one for returning */
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atomic_set(&entry->refcount, 2);
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hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
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batadv_compare_backbone_gw,
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batadv_choose_backbone_gw, entry,
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&entry->hash_entry);
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if (unlikely(hash_added != 0)) {
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/* hash failed, free the structure */
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kfree(entry);
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return NULL;
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}
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/* this is a gateway now, remove any tt entries */
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orig_node = batadv_orig_hash_find(bat_priv, orig);
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if (orig_node) {
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batadv_tt_global_del_orig(bat_priv, orig_node,
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"became a backbone gateway");
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batadv_orig_node_free_ref(orig_node);
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}
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if (own_backbone) {
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batadv_bla_send_announce(bat_priv, entry);
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/* this will be decreased in the worker thread */
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atomic_inc(&entry->request_sent);
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atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
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atomic_inc(&bat_priv->bla.num_requests);
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}
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return entry;
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}
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/* update or add the own backbone gw to make sure we announce
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* where we receive other backbone gws
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*/
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static void
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batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *primary_if,
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short vid)
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{
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struct batadv_bla_backbone_gw *backbone_gw;
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backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
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primary_if->net_dev->dev_addr,
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vid, true);
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if (unlikely(!backbone_gw))
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return;
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backbone_gw->lasttime = jiffies;
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batadv_backbone_gw_free_ref(backbone_gw);
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}
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/* @bat_priv: the bat priv with all the soft interface information
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* @vid: the vid where the request came on
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*
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* Repeat all of our own claims, and finally send an ANNOUNCE frame
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* to allow the requester another check if the CRC is correct now.
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*/
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static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *primary_if,
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short vid)
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{
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struct hlist_node *node;
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struct hlist_head *head;
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struct batadv_hashtable *hash;
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struct batadv_bla_claim *claim;
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struct batadv_bla_backbone_gw *backbone_gw;
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int i;
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batadv_dbg(BATADV_DBG_BLA, bat_priv,
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"bla_answer_request(): received a claim request, send all of our own claims again\n");
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backbone_gw = batadv_backbone_hash_find(bat_priv,
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primary_if->net_dev->dev_addr,
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vid);
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if (!backbone_gw)
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return;
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hash = bat_priv->bla.claim_hash;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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rcu_read_lock();
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hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
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/* only own claims are interesting */
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if (claim->backbone_gw != backbone_gw)
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continue;
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batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
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BATADV_CLAIM_TYPE_CLAIM);
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}
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rcu_read_unlock();
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}
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/* finally, send an announcement frame */
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batadv_bla_send_announce(bat_priv, backbone_gw);
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batadv_backbone_gw_free_ref(backbone_gw);
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}
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/* @backbone_gw: the backbone gateway from whom we are out of sync
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*
|
|
* When the crc is wrong, ask the backbone gateway for a full table update.
|
|
* After the request, it will repeat all of his own claims and finally
|
|
* send an announcement claim with which we can check again.
|
|
*/
|
|
static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
/* first, remove all old entries */
|
|
batadv_bla_del_backbone_claims(backbone_gw);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"Sending REQUEST to %pM\n", backbone_gw->orig);
|
|
|
|
/* send request */
|
|
batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
|
|
backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
|
|
|
|
/* no local broadcasts should be sent or received, for now. */
|
|
if (!atomic_read(&backbone_gw->request_sent)) {
|
|
atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 1);
|
|
}
|
|
}
|
|
|
|
/* @bat_priv: the bat priv with all the soft interface information
|
|
* @backbone_gw: our backbone gateway which should be announced
|
|
*
|
|
* This function sends an announcement. It is called from multiple
|
|
* places.
|
|
*/
|
|
static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
uint8_t mac[ETH_ALEN];
|
|
__be16 crc;
|
|
|
|
memcpy(mac, batadv_announce_mac, 4);
|
|
crc = htons(backbone_gw->crc);
|
|
memcpy(&mac[4], &crc, 2);
|
|
|
|
batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
|
|
BATADV_CLAIM_TYPE_ANNOUNCE);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_add_claim - Adds a claim in the claim hash
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @mac: the mac address of the claim
|
|
* @vid: the VLAN ID of the frame
|
|
* @backbone_gw: the backbone gateway which claims it
|
|
*/
|
|
static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
|
|
const uint8_t *mac, const short vid,
|
|
struct batadv_bla_backbone_gw *backbone_gw)
|
|
{
|
|
struct batadv_bla_claim *claim;
|
|
struct batadv_bla_claim search_claim;
|
|
int hash_added;
|
|
|
|
memcpy(search_claim.addr, mac, ETH_ALEN);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
/* create a new claim entry if it does not exist yet. */
|
|
if (!claim) {
|
|
claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
|
|
if (!claim)
|
|
return;
|
|
|
|
memcpy(claim->addr, mac, ETH_ALEN);
|
|
claim->vid = vid;
|
|
claim->lasttime = jiffies;
|
|
claim->backbone_gw = backbone_gw;
|
|
|
|
atomic_set(&claim->refcount, 2);
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
|
|
mac, vid);
|
|
hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
|
|
batadv_compare_claim,
|
|
batadv_choose_claim, claim,
|
|
&claim->hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* only local changes happened. */
|
|
kfree(claim);
|
|
return;
|
|
}
|
|
} else {
|
|
claim->lasttime = jiffies;
|
|
if (claim->backbone_gw == backbone_gw)
|
|
/* no need to register a new backbone */
|
|
goto claim_free_ref;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"bla_add_claim(): changing ownership for %pM, vid %d\n",
|
|
mac, vid);
|
|
|
|
claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
|
|
batadv_backbone_gw_free_ref(claim->backbone_gw);
|
|
}
|
|
/* set (new) backbone gw */
|
|
atomic_inc(&backbone_gw->refcount);
|
|
claim->backbone_gw = backbone_gw;
|
|
|
|
backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
|
|
backbone_gw->lasttime = jiffies;
|
|
|
|
claim_free_ref:
|
|
batadv_claim_free_ref(claim);
|
|
}
|
|
|
|
/* Delete a claim from the claim hash which has the
|
|
* given mac address and vid.
|
|
*/
|
|
static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
|
|
const uint8_t *mac, const short vid)
|
|
{
|
|
struct batadv_bla_claim search_claim, *claim;
|
|
|
|
memcpy(search_claim.addr, mac, ETH_ALEN);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
if (!claim)
|
|
return;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
|
|
mac, vid);
|
|
|
|
batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
|
|
batadv_choose_claim, claim);
|
|
batadv_claim_free_ref(claim); /* reference from the hash is gone */
|
|
|
|
claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
|
|
|
|
/* don't need the reference from hash_find() anymore */
|
|
batadv_claim_free_ref(claim);
|
|
}
|
|
|
|
/* check for ANNOUNCE frame, return 1 if handled */
|
|
static int batadv_handle_announce(struct batadv_priv *bat_priv,
|
|
uint8_t *an_addr, uint8_t *backbone_addr,
|
|
short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
uint16_t crc;
|
|
|
|
if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
|
|
return 0;
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
|
|
false);
|
|
|
|
if (unlikely(!backbone_gw))
|
|
return 1;
|
|
|
|
|
|
/* handle as ANNOUNCE frame */
|
|
backbone_gw->lasttime = jiffies;
|
|
crc = ntohs(*((__be16 *)(&an_addr[4])));
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
|
|
vid, backbone_gw->orig, crc);
|
|
|
|
if (backbone_gw->crc != crc) {
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
|
|
backbone_gw->orig, backbone_gw->vid,
|
|
backbone_gw->crc, crc);
|
|
|
|
batadv_bla_send_request(backbone_gw);
|
|
} else {
|
|
/* if we have sent a request and the crc was OK,
|
|
* we can allow traffic again.
|
|
*/
|
|
if (atomic_read(&backbone_gw->request_sent)) {
|
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 0);
|
|
}
|
|
}
|
|
|
|
batadv_backbone_gw_free_ref(backbone_gw);
|
|
return 1;
|
|
}
|
|
|
|
/* check for REQUEST frame, return 1 if handled */
|
|
static int batadv_handle_request(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
uint8_t *backbone_addr,
|
|
struct ethhdr *ethhdr, short vid)
|
|
{
|
|
/* check for REQUEST frame */
|
|
if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
|
|
return 0;
|
|
|
|
/* sanity check, this should not happen on a normal switch,
|
|
* we ignore it in this case.
|
|
*/
|
|
if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
|
|
return 1;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"handle_request(): REQUEST vid %d (sent by %pM)...\n",
|
|
vid, ethhdr->h_source);
|
|
|
|
batadv_bla_answer_request(bat_priv, primary_if, vid);
|
|
return 1;
|
|
}
|
|
|
|
/* check for UNCLAIM frame, return 1 if handled */
|
|
static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
uint8_t *backbone_addr,
|
|
uint8_t *claim_addr, short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
/* unclaim in any case if it is our own */
|
|
if (primary_if && batadv_compare_eth(backbone_addr,
|
|
primary_if->net_dev->dev_addr))
|
|
batadv_bla_send_claim(bat_priv, claim_addr, vid,
|
|
BATADV_CLAIM_TYPE_UNCLAIM);
|
|
|
|
backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
|
|
|
|
if (!backbone_gw)
|
|
return 1;
|
|
|
|
/* this must be an UNCLAIM frame */
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
|
|
claim_addr, vid, backbone_gw->orig);
|
|
|
|
batadv_bla_del_claim(bat_priv, claim_addr, vid);
|
|
batadv_backbone_gw_free_ref(backbone_gw);
|
|
return 1;
|
|
}
|
|
|
|
/* check for CLAIM frame, return 1 if handled */
|
|
static int batadv_handle_claim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
uint8_t *backbone_addr, uint8_t *claim_addr,
|
|
short vid)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
|
|
/* register the gateway if not yet available, and add the claim. */
|
|
|
|
backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
|
|
false);
|
|
|
|
if (unlikely(!backbone_gw))
|
|
return 1;
|
|
|
|
/* this must be a CLAIM frame */
|
|
batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
|
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
|
|
batadv_bla_send_claim(bat_priv, claim_addr, vid,
|
|
BATADV_CLAIM_TYPE_CLAIM);
|
|
|
|
/* TODO: we could call something like tt_local_del() here. */
|
|
|
|
batadv_backbone_gw_free_ref(backbone_gw);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* batadv_check_claim_group
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @hw_src: the Hardware source in the ARP Header
|
|
* @hw_dst: the Hardware destination in the ARP Header
|
|
* @ethhdr: pointer to the Ethernet header of the claim frame
|
|
*
|
|
* checks if it is a claim packet and if its on the same group.
|
|
* This function also applies the group ID of the sender
|
|
* if it is in the same mesh.
|
|
*
|
|
* returns:
|
|
* 2 - if it is a claim packet and on the same group
|
|
* 1 - if is a claim packet from another group
|
|
* 0 - if it is not a claim packet
|
|
*/
|
|
static int batadv_check_claim_group(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
uint8_t *hw_src, uint8_t *hw_dst,
|
|
struct ethhdr *ethhdr)
|
|
{
|
|
uint8_t *backbone_addr;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
|
|
|
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
|
|
bla_dst_own = &bat_priv->bla.claim_dest;
|
|
|
|
/* check if it is a claim packet in general */
|
|
if (memcmp(bla_dst->magic, bla_dst_own->magic,
|
|
sizeof(bla_dst->magic)) != 0)
|
|
return 0;
|
|
|
|
/* if announcement packet, use the source,
|
|
* otherwise assume it is in the hw_src
|
|
*/
|
|
switch (bla_dst->type) {
|
|
case BATADV_CLAIM_TYPE_CLAIM:
|
|
backbone_addr = hw_src;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_REQUEST:
|
|
case BATADV_CLAIM_TYPE_ANNOUNCE:
|
|
case BATADV_CLAIM_TYPE_UNCLAIM:
|
|
backbone_addr = ethhdr->h_source;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* don't accept claim frames from ourselves */
|
|
if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
|
|
return 0;
|
|
|
|
/* if its already the same group, it is fine. */
|
|
if (bla_dst->group == bla_dst_own->group)
|
|
return 2;
|
|
|
|
/* lets see if this originator is in our mesh */
|
|
orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
|
|
|
|
/* dont accept claims from gateways which are not in
|
|
* the same mesh or group.
|
|
*/
|
|
if (!orig_node)
|
|
return 1;
|
|
|
|
/* if our mesh friends mac is bigger, use it for ourselves. */
|
|
if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"taking other backbones claim group: %#.4x\n",
|
|
ntohs(bla_dst->group));
|
|
bla_dst_own->group = bla_dst->group;
|
|
}
|
|
|
|
batadv_orig_node_free_ref(orig_node);
|
|
|
|
return 2;
|
|
}
|
|
|
|
|
|
/* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the frame to be checked
|
|
*
|
|
* Check if this is a claim frame, and process it accordingly.
|
|
*
|
|
* returns 1 if it was a claim frame, otherwise return 0 to
|
|
* tell the callee that it can use the frame on its own.
|
|
*/
|
|
static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
struct vlan_ethhdr *vhdr;
|
|
struct arphdr *arphdr;
|
|
uint8_t *hw_src, *hw_dst;
|
|
struct batadv_bla_claim_dst *bla_dst;
|
|
uint16_t proto;
|
|
int headlen;
|
|
short vid = -1;
|
|
int ret;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
|
|
vhdr = (struct vlan_ethhdr *)ethhdr;
|
|
vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
|
|
proto = ntohs(vhdr->h_vlan_encapsulated_proto);
|
|
headlen = sizeof(*vhdr);
|
|
} else {
|
|
proto = ntohs(ethhdr->h_proto);
|
|
headlen = ETH_HLEN;
|
|
}
|
|
|
|
if (proto != ETH_P_ARP)
|
|
return 0; /* not a claim frame */
|
|
|
|
/* this must be a ARP frame. check if it is a claim. */
|
|
|
|
if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
|
|
return 0;
|
|
|
|
/* pskb_may_pull() may have modified the pointers, get ethhdr again */
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
|
|
|
|
/* Check whether the ARP frame carries a valid
|
|
* IP information
|
|
*/
|
|
if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
|
|
return 0;
|
|
if (arphdr->ar_pro != htons(ETH_P_IP))
|
|
return 0;
|
|
if (arphdr->ar_hln != ETH_ALEN)
|
|
return 0;
|
|
if (arphdr->ar_pln != 4)
|
|
return 0;
|
|
|
|
hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
|
|
hw_dst = hw_src + ETH_ALEN + 4;
|
|
bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
|
|
|
|
/* check if it is a claim frame. */
|
|
ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
|
|
ethhdr);
|
|
if (ret == 1)
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
|
|
ethhdr->h_source, vid, hw_src, hw_dst);
|
|
|
|
if (ret < 2)
|
|
return ret;
|
|
|
|
/* become a backbone gw ourselves on this vlan if not happened yet */
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
|
|
/* check for the different types of claim frames ... */
|
|
switch (bla_dst->type) {
|
|
case BATADV_CLAIM_TYPE_CLAIM:
|
|
if (batadv_handle_claim(bat_priv, primary_if, hw_src,
|
|
ethhdr->h_source, vid))
|
|
return 1;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_UNCLAIM:
|
|
if (batadv_handle_unclaim(bat_priv, primary_if,
|
|
ethhdr->h_source, hw_src, vid))
|
|
return 1;
|
|
break;
|
|
|
|
case BATADV_CLAIM_TYPE_ANNOUNCE:
|
|
if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
|
|
vid))
|
|
return 1;
|
|
break;
|
|
case BATADV_CLAIM_TYPE_REQUEST:
|
|
if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
|
|
vid))
|
|
return 1;
|
|
break;
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
|
|
ethhdr->h_source, vid, hw_src, hw_dst);
|
|
return 1;
|
|
}
|
|
|
|
/* Check when we last heard from other nodes, and remove them in case of
|
|
* a time out, or clean all backbone gws if now is set.
|
|
*/
|
|
static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
int i;
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(backbone_gw, node, node_tmp,
|
|
head, hash_entry) {
|
|
if (now)
|
|
goto purge_now;
|
|
if (!batadv_has_timed_out(backbone_gw->lasttime,
|
|
BATADV_BLA_BACKBONE_TIMEOUT))
|
|
continue;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
|
|
"bla_purge_backbone_gw(): backbone gw %pM timed out\n",
|
|
backbone_gw->orig);
|
|
|
|
purge_now:
|
|
/* don't wait for the pending request anymore */
|
|
if (atomic_read(&backbone_gw->request_sent))
|
|
atomic_dec(&bat_priv->bla.num_requests);
|
|
|
|
batadv_bla_del_backbone_claims(backbone_gw);
|
|
|
|
hlist_del_rcu(node);
|
|
batadv_backbone_gw_free_ref(backbone_gw);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_purge_claims
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the selected primary interface, may be NULL if now is set
|
|
* @now: whether the whole hash shall be wiped now
|
|
*
|
|
* Check when we heard last time from our own claims, and remove them in case of
|
|
* a time out, or clean all claims if now is set
|
|
*/
|
|
static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
int now)
|
|
{
|
|
struct batadv_bla_claim *claim;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
int i;
|
|
|
|
hash = bat_priv->bla.claim_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
|
|
if (now)
|
|
goto purge_now;
|
|
if (!batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr))
|
|
continue;
|
|
if (!batadv_has_timed_out(claim->lasttime,
|
|
BATADV_BLA_CLAIM_TIMEOUT))
|
|
continue;
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv,
|
|
"bla_purge_claims(): %pM, vid %d, time out\n",
|
|
claim->addr, claim->vid);
|
|
|
|
purge_now:
|
|
batadv_handle_unclaim(bat_priv, primary_if,
|
|
claim->backbone_gw->orig,
|
|
claim->addr, claim->vid);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_update_orig_address
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @primary_if: the new selected primary_if
|
|
* @oldif: the old primary interface, may be NULL
|
|
*
|
|
* Update the backbone gateways when the own orig address changes.
|
|
*/
|
|
void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *primary_if,
|
|
struct batadv_hard_iface *oldif)
|
|
{
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_hashtable *hash;
|
|
__be16 group;
|
|
int i;
|
|
|
|
/* reset bridge loop avoidance group id */
|
|
group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
|
|
bat_priv->bla.claim_dest.group = group;
|
|
|
|
if (!oldif) {
|
|
batadv_bla_purge_claims(bat_priv, NULL, 1);
|
|
batadv_bla_purge_backbone_gw(bat_priv, 1);
|
|
return;
|
|
}
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
|
|
/* own orig still holds the old value. */
|
|
if (!batadv_compare_eth(backbone_gw->orig,
|
|
oldif->net_dev->dev_addr))
|
|
continue;
|
|
|
|
memcpy(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
/* send an announce frame so others will ask for our
|
|
* claims and update their tables.
|
|
*/
|
|
batadv_bla_send_announce(bat_priv, backbone_gw);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/* periodic work to do:
|
|
* * purge structures when they are too old
|
|
* * send announcements
|
|
*/
|
|
static void batadv_bla_periodic_work(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_priv_bla *priv_bla;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_hashtable *hash;
|
|
struct batadv_hard_iface *primary_if;
|
|
int i;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
|
|
bat_priv = container_of(priv_bla, struct batadv_priv, bla);
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
batadv_bla_purge_claims(bat_priv, primary_if, 0);
|
|
batadv_bla_purge_backbone_gw(bat_priv, 0);
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto out;
|
|
|
|
hash = bat_priv->bla.backbone_hash;
|
|
if (!hash)
|
|
goto out;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
|
|
if (!batadv_compare_eth(backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr))
|
|
continue;
|
|
|
|
backbone_gw->lasttime = jiffies;
|
|
|
|
batadv_bla_send_announce(bat_priv, backbone_gw);
|
|
|
|
/* request_sent is only set after creation to avoid
|
|
* problems when we are not yet known as backbone gw
|
|
* in the backbone.
|
|
*
|
|
* We can reset this now after we waited some periods
|
|
* to give bridge forward delays and bla group forming
|
|
* some grace time.
|
|
*/
|
|
|
|
if (atomic_read(&backbone_gw->request_sent) == 0)
|
|
continue;
|
|
|
|
if (!atomic_dec_and_test(&backbone_gw->wait_periods))
|
|
continue;
|
|
|
|
atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
|
|
atomic_set(&backbone_gw->request_sent, 0);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
|
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
|
|
}
|
|
|
|
/* The hash for claim and backbone hash receive the same key because they
|
|
* are getting initialized by hash_new with the same key. Reinitializing
|
|
* them with to different keys to allow nested locking without generating
|
|
* lockdep warnings
|
|
*/
|
|
static struct lock_class_key batadv_claim_hash_lock_class_key;
|
|
static struct lock_class_key batadv_backbone_hash_lock_class_key;
|
|
|
|
/* initialize all bla structures */
|
|
int batadv_bla_init(struct batadv_priv *bat_priv)
|
|
{
|
|
int i;
|
|
uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
|
|
struct batadv_hard_iface *primary_if;
|
|
uint16_t crc;
|
|
unsigned long entrytime;
|
|
|
|
spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
|
|
|
|
/* setting claim destination address */
|
|
memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
|
|
bat_priv->bla.claim_dest.type = 0;
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (primary_if) {
|
|
crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
bat_priv->bla.claim_dest.group = htons(crc);
|
|
batadv_hardif_free_ref(primary_if);
|
|
} else {
|
|
bat_priv->bla.claim_dest.group = 0; /* will be set later */
|
|
}
|
|
|
|
/* initialize the duplicate list */
|
|
entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
|
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
|
|
bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
|
|
bat_priv->bla.bcast_duplist_curr = 0;
|
|
|
|
if (bat_priv->bla.claim_hash)
|
|
return 0;
|
|
|
|
bat_priv->bla.claim_hash = batadv_hash_new(128);
|
|
bat_priv->bla.backbone_hash = batadv_hash_new(32);
|
|
|
|
if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
|
|
return -ENOMEM;
|
|
|
|
batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
|
|
&batadv_claim_hash_lock_class_key);
|
|
batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
|
|
&batadv_backbone_hash_lock_class_key);
|
|
|
|
batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
|
|
|
|
INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
|
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
|
|
msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_check_bcast_duplist
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: contains the bcast_packet to be checked
|
|
*
|
|
* check if it is on our broadcast list. Another gateway might
|
|
* have sent the same packet because it is connected to the same backbone,
|
|
* so we have to remove this duplicate.
|
|
*
|
|
* This is performed by checking the CRC, which will tell us
|
|
* with a good chance that it is the same packet. If it is furthermore
|
|
* sent by another host, drop it. We allow equal packets from
|
|
* the same host however as this might be intended.
|
|
*/
|
|
int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
|
|
struct sk_buff *skb)
|
|
{
|
|
int i, curr, ret = 0;
|
|
__be32 crc;
|
|
struct batadv_bcast_packet *bcast_packet;
|
|
struct batadv_bcast_duplist_entry *entry;
|
|
|
|
bcast_packet = (struct batadv_bcast_packet *)skb->data;
|
|
|
|
/* calculate the crc ... */
|
|
crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
|
|
|
|
spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
|
|
curr = (bat_priv->bla.bcast_duplist_curr + i);
|
|
curr %= BATADV_DUPLIST_SIZE;
|
|
entry = &bat_priv->bla.bcast_duplist[curr];
|
|
|
|
/* we can stop searching if the entry is too old ;
|
|
* later entries will be even older
|
|
*/
|
|
if (batadv_has_timed_out(entry->entrytime,
|
|
BATADV_DUPLIST_TIMEOUT))
|
|
break;
|
|
|
|
if (entry->crc != crc)
|
|
continue;
|
|
|
|
if (batadv_compare_eth(entry->orig, bcast_packet->orig))
|
|
continue;
|
|
|
|
/* this entry seems to match: same crc, not too old,
|
|
* and from another gw. therefore return 1 to forbid it.
|
|
*/
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
/* not found, add a new entry (overwrite the oldest entry)
|
|
* and allow it, its the first occurence.
|
|
*/
|
|
curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
|
|
curr %= BATADV_DUPLIST_SIZE;
|
|
entry = &bat_priv->bla.bcast_duplist[curr];
|
|
entry->crc = crc;
|
|
entry->entrytime = jiffies;
|
|
memcpy(entry->orig, bcast_packet->orig, ETH_ALEN);
|
|
bat_priv->bla.bcast_duplist_curr = curr;
|
|
|
|
out:
|
|
spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
/* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: originator mac address
|
|
*
|
|
* check if the originator is a gateway for any VLAN ID.
|
|
*
|
|
* returns 1 if it is found, 0 otherwise
|
|
*/
|
|
int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
int i;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
return 0;
|
|
|
|
if (!hash)
|
|
return 0;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
|
|
if (batadv_compare_eth(backbone_gw->orig, orig)) {
|
|
rcu_read_unlock();
|
|
return 1;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* batadv_bla_is_backbone_gw
|
|
* @skb: the frame to be checked
|
|
* @orig_node: the orig_node of the frame
|
|
* @hdr_size: maximum length of the frame
|
|
*
|
|
* bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
|
|
* if the orig_node is also a gateway on the soft interface, otherwise it
|
|
* returns 0.
|
|
*/
|
|
int batadv_bla_is_backbone_gw(struct sk_buff *skb,
|
|
struct batadv_orig_node *orig_node, int hdr_size)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
struct vlan_ethhdr *vhdr;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
short vid = -1;
|
|
|
|
if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
|
|
return 0;
|
|
|
|
/* first, find out the vid. */
|
|
if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
|
|
return 0;
|
|
|
|
ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
|
|
|
|
if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
|
|
if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
|
|
return 0;
|
|
|
|
vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
|
|
vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
|
|
}
|
|
|
|
/* see if this originator is a backbone gw for this VLAN */
|
|
backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
|
|
orig_node->orig, vid);
|
|
if (!backbone_gw)
|
|
return 0;
|
|
|
|
batadv_backbone_gw_free_ref(backbone_gw);
|
|
return 1;
|
|
}
|
|
|
|
/* free all bla structures (for softinterface free or module unload) */
|
|
void batadv_bla_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hard_iface *primary_if;
|
|
|
|
cancel_delayed_work_sync(&bat_priv->bla.work);
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
|
|
if (bat_priv->bla.claim_hash) {
|
|
batadv_bla_purge_claims(bat_priv, primary_if, 1);
|
|
batadv_hash_destroy(bat_priv->bla.claim_hash);
|
|
bat_priv->bla.claim_hash = NULL;
|
|
}
|
|
if (bat_priv->bla.backbone_hash) {
|
|
batadv_bla_purge_backbone_gw(bat_priv, 1);
|
|
batadv_hash_destroy(bat_priv->bla.backbone_hash);
|
|
bat_priv->bla.backbone_hash = NULL;
|
|
}
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_rx
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the frame to be checked
|
|
* @vid: the VLAN ID of the frame
|
|
* @is_bcast: the packet came in a broadcast packet type.
|
|
*
|
|
* bla_rx avoidance checks if:
|
|
* * we have to race for a claim
|
|
* * if the frame is allowed on the LAN
|
|
*
|
|
* in these cases, the skb is further handled by this function and
|
|
* returns 1, otherwise it returns 0 and the caller shall further
|
|
* process the skb.
|
|
*/
|
|
int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid,
|
|
bool is_bcast)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_bla_claim search_claim, *claim = NULL;
|
|
struct batadv_hard_iface *primary_if;
|
|
int ret;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto handled;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto allow;
|
|
|
|
|
|
if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
|
|
/* don't allow broadcasts while requests are in flight */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
|
|
goto handled;
|
|
|
|
memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
|
|
search_claim.vid = vid;
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
if (!claim) {
|
|
/* possible optimization: race for a claim */
|
|
/* No claim exists yet, claim it for us!
|
|
*/
|
|
batadv_handle_claim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
}
|
|
|
|
/* if it is our own claim ... */
|
|
if (batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr)) {
|
|
/* ... allow it in any case */
|
|
claim->lasttime = jiffies;
|
|
goto allow;
|
|
}
|
|
|
|
/* if it is a broadcast ... */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
|
|
/* ... drop it. the responsible gateway is in charge.
|
|
*
|
|
* We need to check is_bcast because with the gateway
|
|
* feature, broadcasts (like DHCP requests) may be sent
|
|
* using a unicast packet type.
|
|
*/
|
|
goto handled;
|
|
} else {
|
|
/* seems the client considers us as its best gateway.
|
|
* send a claim and update the claim table
|
|
* immediately.
|
|
*/
|
|
batadv_handle_claim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
}
|
|
allow:
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
ret = 0;
|
|
goto out;
|
|
|
|
handled:
|
|
kfree_skb(skb);
|
|
ret = 1;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (claim)
|
|
batadv_claim_free_ref(claim);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_bla_tx
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @skb: the frame to be checked
|
|
* @vid: the VLAN ID of the frame
|
|
*
|
|
* bla_tx checks if:
|
|
* * a claim was received which has to be processed
|
|
* * the frame is allowed on the mesh
|
|
*
|
|
* in these cases, the skb is further handled by this function and
|
|
* returns 1, otherwise it returns 0 and the caller shall further
|
|
* process the skb.
|
|
*/
|
|
int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, short vid)
|
|
{
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_bla_claim search_claim, *claim = NULL;
|
|
struct batadv_hard_iface *primary_if;
|
|
int ret = 0;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
if (!atomic_read(&bat_priv->bridge_loop_avoidance))
|
|
goto allow;
|
|
|
|
/* in VLAN case, the mac header might not be set. */
|
|
skb_reset_mac_header(skb);
|
|
|
|
if (batadv_bla_process_claim(bat_priv, primary_if, skb))
|
|
goto handled;
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
|
|
if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
|
|
/* don't allow broadcasts while requests are in flight */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest))
|
|
goto handled;
|
|
|
|
memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN);
|
|
search_claim.vid = vid;
|
|
|
|
claim = batadv_claim_hash_find(bat_priv, &search_claim);
|
|
|
|
/* if no claim exists, allow it. */
|
|
if (!claim)
|
|
goto allow;
|
|
|
|
/* check if we are responsible. */
|
|
if (batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_if->net_dev->dev_addr)) {
|
|
/* if yes, the client has roamed and we have
|
|
* to unclaim it.
|
|
*/
|
|
batadv_handle_unclaim(bat_priv, primary_if,
|
|
primary_if->net_dev->dev_addr,
|
|
ethhdr->h_source, vid);
|
|
goto allow;
|
|
}
|
|
|
|
/* check if it is a multicast/broadcast frame */
|
|
if (is_multicast_ether_addr(ethhdr->h_dest)) {
|
|
/* drop it. the responsible gateway has forwarded it into
|
|
* the backbone network.
|
|
*/
|
|
goto handled;
|
|
} else {
|
|
/* we must allow it. at least if we are
|
|
* responsible for the DESTINATION.
|
|
*/
|
|
goto allow;
|
|
}
|
|
allow:
|
|
batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
|
|
ret = 0;
|
|
goto out;
|
|
handled:
|
|
ret = 1;
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (claim)
|
|
batadv_claim_free_ref(claim);
|
|
return ret;
|
|
}
|
|
|
|
int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
|
|
struct batadv_bla_claim *claim;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
uint32_t i;
|
|
bool is_own;
|
|
uint8_t *primary_addr;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
primary_addr = primary_if->net_dev->dev_addr;
|
|
seq_printf(seq,
|
|
"Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
|
|
net_dev->name, primary_addr,
|
|
ntohs(bat_priv->bla.claim_dest.group));
|
|
seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
|
|
"Client", "VID", "Originator", "CRC");
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(claim, node, head, hash_entry) {
|
|
is_own = batadv_compare_eth(claim->backbone_gw->orig,
|
|
primary_addr);
|
|
seq_printf(seq, " * %pM on % 5d by %pM [%c] (%#.4x)\n",
|
|
claim->addr, claim->vid,
|
|
claim->backbone_gw->orig,
|
|
(is_own ? 'x' : ' '),
|
|
claim->backbone_gw->crc);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return 0;
|
|
}
|
|
|
|
int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
|
|
struct batadv_bla_backbone_gw *backbone_gw;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
int secs, msecs;
|
|
uint32_t i;
|
|
bool is_own;
|
|
uint8_t *primary_addr;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
primary_addr = primary_if->net_dev->dev_addr;
|
|
seq_printf(seq,
|
|
"Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
|
|
net_dev->name, primary_addr,
|
|
ntohs(bat_priv->bla.claim_dest.group));
|
|
seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
|
|
"Originator", "VID", "last seen", "CRC");
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) {
|
|
msecs = jiffies_to_msecs(jiffies -
|
|
backbone_gw->lasttime);
|
|
secs = msecs / 1000;
|
|
msecs = msecs % 1000;
|
|
|
|
is_own = batadv_compare_eth(backbone_gw->orig,
|
|
primary_addr);
|
|
if (is_own)
|
|
continue;
|
|
|
|
seq_printf(seq,
|
|
" * %pM on % 5d % 4i.%03is (%#.4x)\n",
|
|
backbone_gw->orig, backbone_gw->vid,
|
|
secs, msecs, backbone_gw->crc);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return 0;
|
|
}
|