--- /dev/null
+/* Copyright (C) 2011-2014 B.A.T.M.A.N. contributors:
+ *
+ * Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+#include "hash.h"
+#include "hard-interface.h"
+#include "originator.h"
+#include "bridge_loop_avoidance.h"
+#include "translation-table.h"
+#include "send.h"
+
+#include <linux/etherdevice.h>
+#include <linux/crc16.h>
+#include <linux/if_arp.h>
+#include <net/arp.h>
+#include <linux/if_vlan.h>
+
+static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
+
+static void batadv_bla_periodic_work(struct work_struct *work);
+static void
+batadv_bla_send_announce(struct batadv_priv *bat_priv,
+ struct batadv_bla_backbone_gw *backbone_gw);
+
+/* return the index of the claim */
+static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
+{
+ struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
+ uint32_t hash = 0;
+
+ hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
+ hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
+
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash % size;
+}
+
+/* return the index of the backbone gateway */
+static inline uint32_t batadv_choose_backbone_gw(const void *data,
+ uint32_t size)
+{
+ const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
+ uint32_t hash = 0;
+
+ hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
+ hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
+
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash % size;
+}
+
+/* compares address and vid of two backbone gws */
+static int batadv_compare_backbone_gw(const struct hlist_node *node,
+ const void *data2)
+{
+ const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
+ hash_entry);
+ const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
+
+ if (!batadv_compare_eth(gw1->orig, gw2->orig))
+ return 0;
+
+ if (gw1->vid != gw2->vid)
+ return 0;
+
+ return 1;
+}
+
+/* compares address and vid of two claims */
+static int batadv_compare_claim(const struct hlist_node *node,
+ const void *data2)
+{
+ const void *data1 = container_of(node, struct batadv_bla_claim,
+ hash_entry);
+ const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
+
+ if (!batadv_compare_eth(cl1->addr, cl2->addr))
+ return 0;
+
+ if (cl1->vid != cl2->vid)
+ return 0;
+
+ return 1;
+}
+
+/* free a backbone gw */
+static void
+batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
+{
+ if (atomic_dec_and_test(&backbone_gw->refcount))
+ kfree_rcu(backbone_gw, rcu);
+}
+
+/* finally deinitialize the claim */
+static void batadv_claim_free_rcu(struct rcu_head *rcu)
+{
+ struct batadv_bla_claim *claim;
+
+ claim = container_of(rcu, struct batadv_bla_claim, rcu);
+
+ batadv_backbone_gw_free_ref(claim->backbone_gw);
+ kfree(claim);
+}
+
+/* free a claim, call claim_free_rcu if its the last reference */
+static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
+{
+ if (atomic_dec_and_test(&claim->refcount))
+ call_rcu(&claim->rcu, batadv_claim_free_rcu);
+}
+
+/**
+ * batadv_claim_hash_find
+ * @bat_priv: the bat priv with all the soft interface information
+ * @data: search data (may be local/static data)
+ *
+ * looks for a claim in the hash, and returns it if found
+ * or NULL otherwise.
+ */
+static struct batadv_bla_claim
+*batadv_claim_hash_find(struct batadv_priv *bat_priv,
+ struct batadv_bla_claim *data)
+{
+ struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
+ struct hlist_head *head;
+ struct batadv_bla_claim *claim;
+ struct batadv_bla_claim *claim_tmp = NULL;
+ int index;
+
+ if (!hash)
+ return NULL;
+
+ index = batadv_choose_claim(data, hash->size);
+ head = &hash->table[index];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(claim, head, hash_entry) {
+ if (!batadv_compare_claim(&claim->hash_entry, data))
+ continue;
+
+ if (!atomic_inc_not_zero(&claim->refcount))
+ continue;
+
+ claim_tmp = claim;
+ break;
+ }
+ rcu_read_unlock();
+
+ return claim_tmp;
+}
+
+/**
+ * batadv_backbone_hash_find - looks for a claim in the hash
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the address of the originator
+ * @vid: the VLAN ID
+ *
+ * Returns claim if found or NULL otherwise.
+ */
+static struct batadv_bla_backbone_gw *
+batadv_backbone_hash_find(struct batadv_priv *bat_priv,
+ uint8_t *addr, unsigned short vid)
+{
+ struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
+ struct hlist_head *head;
+ struct batadv_bla_backbone_gw search_entry, *backbone_gw;
+ struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
+ int index;
+
+ if (!hash)
+ return NULL;
+
+ ether_addr_copy(search_entry.orig, addr);
+ search_entry.vid = vid;
+
+ index = batadv_choose_backbone_gw(&search_entry, hash->size);
+ head = &hash->table[index];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
+ if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
+ &search_entry))
+ continue;
+
+ if (!atomic_inc_not_zero(&backbone_gw->refcount))
+ continue;
+
+ backbone_gw_tmp = backbone_gw;
+ break;
+ }
+ rcu_read_unlock();
+
+ return backbone_gw_tmp;
+}
+
+/* delete all claims for a backbone */
+static void
+batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
+{
+ struct batadv_hashtable *hash;
+ struct hlist_node *node_tmp;
+ struct hlist_head *head;
+ struct batadv_bla_claim *claim;
+ int i;
+ spinlock_t *list_lock; /* protects write access to the hash lists */
+
+ hash = backbone_gw->bat_priv->bla.claim_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(claim, node_tmp,
+ head, hash_entry) {
+ if (claim->backbone_gw != backbone_gw)
+ continue;
+
+ batadv_claim_free_ref(claim);
+ hlist_del_rcu(&claim->hash_entry);
+ }
+ spin_unlock_bh(list_lock);
+ }
+
+ /* all claims gone, initialize CRC */
+ backbone_gw->crc = BATADV_BLA_CRC_INIT;
+}
+
+/**
+ * batadv_bla_send_claim - sends a claim frame according to the provided info
+ * @bat_priv: the bat priv with all the soft interface information
+ * @mac: the mac address to be announced within the claim
+ * @vid: the VLAN ID
+ * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
+ */
+static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
+ unsigned short vid, int claimtype)
+{
+ struct sk_buff *skb;
+ struct ethhdr *ethhdr;
+ struct batadv_hard_iface *primary_if;
+ struct net_device *soft_iface;
+ uint8_t *hw_src;
+ struct batadv_bla_claim_dst local_claim_dest;
+ __be32 zeroip = 0;
+
+ primary_if = batadv_primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ return;
+
+ memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
+ sizeof(local_claim_dest));
+ local_claim_dest.type = claimtype;
+
+ soft_iface = primary_if->soft_iface;
+
+ skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
+ /* IP DST: 0.0.0.0 */
+ zeroip,
+ primary_if->soft_iface,
+ /* IP SRC: 0.0.0.0 */
+ zeroip,
+ /* Ethernet DST: Broadcast */
+ NULL,
+ /* Ethernet SRC/HW SRC: originator mac */
+ primary_if->net_dev->dev_addr,
+ /* HW DST: FF:43:05:XX:YY:YY
+ * with XX = claim type
+ * and YY:YY = group id
+ */
+ (uint8_t *)&local_claim_dest);
+
+ if (!skb)
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb->data;
+ hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
+
+ /* now we pretend that the client would have sent this ... */
+ switch (claimtype) {
+ case BATADV_CLAIM_TYPE_CLAIM:
+ /* normal claim frame
+ * set Ethernet SRC to the clients mac
+ */
+ ether_addr_copy(ethhdr->h_source, mac);
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
+ BATADV_PRINT_VID(vid));
+ break;
+ case BATADV_CLAIM_TYPE_UNCLAIM:
+ /* unclaim frame
+ * set HW SRC to the clients mac
+ */
+ ether_addr_copy(hw_src, mac);
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
+ BATADV_PRINT_VID(vid));
+ break;
+ case BATADV_CLAIM_TYPE_ANNOUNCE:
+ /* announcement frame
+ * set HW SRC to the special mac containg the crc
+ */
+ ether_addr_copy(hw_src, mac);
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
+ ethhdr->h_source, BATADV_PRINT_VID(vid));
+ break;
+ case BATADV_CLAIM_TYPE_REQUEST:
+ /* request frame
+ * set HW SRC and header destination to the receiving backbone
+ * gws mac
+ */
+ ether_addr_copy(hw_src, mac);
+ ether_addr_copy(ethhdr->h_dest, mac);
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
+ ethhdr->h_source, ethhdr->h_dest,
+ BATADV_PRINT_VID(vid));
+ break;
+ }
+
+ if (vid & BATADV_VLAN_HAS_TAG)
+ skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
+ vid & VLAN_VID_MASK);
+
+ skb_reset_mac_header(skb);
+ skb->protocol = eth_type_trans(skb, soft_iface);
+ batadv_inc_counter(bat_priv, BATADV_CNT_RX);
+ batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
+ skb->len + ETH_HLEN);
+ soft_iface->last_rx = jiffies;
+
+ netif_rx(skb);
+out:
+ if (primary_if)
+ batadv_hardif_free_ref(primary_if);
+}
+
+/**
+ * batadv_bla_get_backbone_gw
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: the mac address of the originator
+ * @vid: the VLAN ID
+ * @own_backbone: set if the requested backbone is local
+ *
+ * searches for the backbone gw or creates a new one if it could not
+ * be found.
+ */
+static struct batadv_bla_backbone_gw *
+batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
+ unsigned short vid, bool own_backbone)
+{
+ struct batadv_bla_backbone_gw *entry;
+ struct batadv_orig_node *orig_node;
+ int hash_added;
+
+ entry = batadv_backbone_hash_find(bat_priv, orig, vid);
+
+ if (entry)
+ return entry;
+
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
+ orig, BATADV_PRINT_VID(vid));
+
+ entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+ if (!entry)
+ return NULL;
+
+ entry->vid = vid;
+ entry->lasttime = jiffies;
+ entry->crc = BATADV_BLA_CRC_INIT;
+ entry->bat_priv = bat_priv;
+ atomic_set(&entry->request_sent, 0);
+ atomic_set(&entry->wait_periods, 0);
+ ether_addr_copy(entry->orig, orig);
+
+ /* one for the hash, one for returning */
+ atomic_set(&entry->refcount, 2);
+
+ hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
+ batadv_compare_backbone_gw,
+ batadv_choose_backbone_gw, entry,
+ &entry->hash_entry);
+
+ if (unlikely(hash_added != 0)) {
+ /* hash failed, free the structure */
+ kfree(entry);
+ return NULL;
+ }
+
+ /* this is a gateway now, remove any TT entry on this VLAN */
+ orig_node = batadv_orig_hash_find(bat_priv, orig);
+ if (orig_node) {
+ batadv_tt_global_del_orig(bat_priv, orig_node, vid,
+ "became a backbone gateway");
+ batadv_orig_node_free_ref(orig_node);
+ }
+
+ if (own_backbone) {
+ batadv_bla_send_announce(bat_priv, entry);
+
+ /* this will be decreased in the worker thread */
+ atomic_inc(&entry->request_sent);
+ atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
+ atomic_inc(&bat_priv->bla.num_requests);
+ }
+
+ return entry;
+}
+
+/* update or add the own backbone gw to make sure we announce
+ * where we receive other backbone gws
+ */
+static void
+batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
+ struct batadv_hard_iface *primary_if,
+ unsigned short vid)
+{
+ struct batadv_bla_backbone_gw *backbone_gw;
+
+ backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
+ primary_if->net_dev->dev_addr,
+ vid, true);
+ if (unlikely(!backbone_gw))
+ return;
+
+ backbone_gw->lasttime = jiffies;
+ batadv_backbone_gw_free_ref(backbone_gw);
+}
+
+/**
+ * batadv_bla_answer_request - answer a bla request by sending own claims
+ * @bat_priv: the bat priv with all the soft interface information
+ * @primary_if: interface where the request came on
+ * @vid: the vid where the request came on
+ *
+ * Repeat all of our own claims, and finally send an ANNOUNCE frame
+ * to allow the requester another check if the CRC is correct now.
+ */
+static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
+ struct batadv_hard_iface *primary_if,
+ unsigned short vid)
+{
+ struct hlist_head *head;
+ struct batadv_hashtable *hash;
+ struct batadv_bla_claim *claim;
+ struct batadv_bla_backbone_gw *backbone_gw;
+ int i;
+
+ batadv_dbg(BATADV_DBG_BLA, bat_priv,
+ "bla_answer_request(): received a claim request, send all of our own claims again\n");
+
+ backbone_gw = batadv_backbone_hash_find(bat_priv,
+ primary_if->net_dev->dev_addr,
+ vid);
+ if (!backbone_gw)
+ return;
+
+ hash = bat_priv->bla.claim_hash;
+ for (i = 0; i < hash->size; i++) {
+ head = &hash->table[i];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(claim, head, hash_entry) {
+ /* only own claims are interesting */
+ if (claim->backbone_gw != backbone_gw)
+ continue;
+
+ batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
+ BATADV_CLAIM_TYPE_CLAIM);
+ }
+ rcu_read_unlock();
+ }
+
+ /* finally, send an announcement frame */
+ batadv_bla_send_announce(bat_priv, backbone_gw);
+ batadv_backbone_gw_free_ref(backbone_gw);
+}
+
+/**
+ * batadv_bla_send_request - send a request to repeat claims
+ * @backbone_gw: the backbone gateway from whom we are out of sync
+ *
+ * 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);
+ }
+}
+
+/**
+ * batadv_bla_send_announce
+ * @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 unsigned short vid,
+ struct batadv_bla_backbone_gw *backbone_gw)
+{
+ struct batadv_bla_claim *claim;
+ struct batadv_bla_claim search_claim;
+ int hash_added;
+
+ ether_addr_copy(search_claim.addr, mac);
+ 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;
+
+ ether_addr_copy(claim->addr, mac);
+ 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, BATADV_PRINT_VID(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, BATADV_PRINT_VID(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 unsigned short vid)
+{
+ struct batadv_bla_claim search_claim, *claim;
+
+ ether_addr_copy(search_claim.addr, mac);
+ 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, BATADV_PRINT_VID(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,
+ unsigned 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",
+ BATADV_PRINT_VID(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,
+ BATADV_PRINT_VID(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, unsigned 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",
+ BATADV_PRINT_VID(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, unsigned 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, BATADV_PRINT_VID(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,
+ unsigned 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
+ * @primary_if: the primary interface of this batman interface
+ * @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;
+
+ /* 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;
+}
+
+/**
+ * batadv_bla_process_claim
+ * @bat_priv: the bat priv with all the soft interface information
+ * @primary_if: the primary hard interface of this batman soft interface
+ * @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 batadv_bla_claim_dst *bla_dst, *bla_dst_own;
+ uint8_t *hw_src, *hw_dst;
+ struct vlan_hdr *vhdr, vhdr_buf;
+ struct ethhdr *ethhdr;
+ struct arphdr *arphdr;
+ unsigned short vid;
+ int vlan_depth = 0;
+ __be16 proto;
+ int headlen;
+ int ret;
+
+ vid = batadv_get_vid(skb, 0);
+ ethhdr = eth_hdr(skb);
+
+ proto = ethhdr->h_proto;
+ headlen = ETH_HLEN;
+ if (vid & BATADV_VLAN_HAS_TAG) {
+ /* Traverse the VLAN/Ethertypes.
+ *
+ * At this point it is known that the first protocol is a VLAN
+ * header, so start checking at the encapsulated protocol.
+ *
+ * The depth of the VLAN headers is recorded to drop BLA claim
+ * frames encapsulated into multiple VLAN headers (QinQ).
+ */
+ do {
+ vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
+ &vhdr_buf);
+ if (!vhdr)
+ return 0;
+
+ proto = vhdr->h_vlan_encapsulated_proto;
+ headlen += VLAN_HLEN;
+ vlan_depth++;
+ } while (proto == htons(ETH_P_8021Q));
+ }
+
+ if (proto != htons(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 = eth_hdr(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;
+ bla_dst_own = &bat_priv->bla.claim_dest;
+
+ /* check if it is a claim frame in general */
+ if (memcmp(bla_dst->magic, bla_dst_own->magic,
+ sizeof(bla_dst->magic)) != 0)
+ return 0;
+
+ /* check if there is a claim frame encapsulated deeper in (QinQ) and
+ * drop that, as this is not supported by BLA but should also not be
+ * sent via the mesh.
+ */
+ if (vlan_depth > 1)
+ return 1;
+
+ /* 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, BATADV_PRINT_VID(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, BATADV_PRINT_VID(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_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_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(&backbone_gw->hash_entry);
+ 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_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, 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_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;
+
+ /* purge everything when bridge loop avoidance is turned off */
+ if (!atomic_read(&bat_priv->bridge_loop_avoidance))
+ oldif = NULL;
+
+ 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, head, hash_entry) {
+ /* own orig still holds the old value. */
+ if (!batadv_compare_eth(backbone_gw->orig,
+ oldif->net_dev->dev_addr))
+ continue;
+
+ ether_addr_copy(backbone_gw->orig,
+ primary_if->net_dev->dev_addr);
+ /* 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_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, 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 occurrence.
+ */
+ 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;
+ ether_addr_copy(entry->orig, bcast_packet->orig);
+ bat_priv->bla.bcast_duplist_curr = curr;
+
+out:
+ spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
+
+ return ret;
+}
+
+/**
+ * batadv_bla_is_backbone_gw_orig
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig: originator mac address
+ * @vid: VLAN identifier
+ *
+ * Check if the originator is a gateway for the VLAN identified by vid.
+ *
+ * Returns true if orig is a backbone for this vid, false otherwise.
+ */
+bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
+ unsigned short vid)
+{
+ struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
+ struct hlist_head *head;
+ struct batadv_bla_backbone_gw *backbone_gw;
+ int i;
+
+ if (!atomic_read(&bat_priv->bridge_loop_avoidance))
+ return false;
+
+ if (!hash)
+ return false;
+
+ for (i = 0; i < hash->size; i++) {
+ head = &hash->table[i];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
+ if (batadv_compare_eth(backbone_gw->orig, orig) &&
+ backbone_gw->vid == vid) {
+ rcu_read_unlock();
+ return true;
+ }
+ }
+ rcu_read_unlock();
+ }
+
+ return false;
+}
+
+/**
+ * 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 batadv_bla_backbone_gw *backbone_gw;
+ unsigned short vid;
+
+ 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;
+
+ vid = batadv_get_vid(skb, hdr_size);
+
+ /* 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,
+ unsigned 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 = eth_hdr(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;
+
+ ether_addr_copy(search_claim.addr, ethhdr->h_source);
+ 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.
+ *
+ * This call might reallocate skb data.
+ */
+int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
+ unsigned 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;
+
+ if (batadv_bla_process_claim(bat_priv, primary_if, skb))
+ goto handled;
+
+ ethhdr = eth_hdr(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;
+
+ ether_addr_copy(search_claim.addr, ethhdr->h_source);
+ 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_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, 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, BATADV_PRINT_VID(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_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, 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,
+ BATADV_PRINT_VID(backbone_gw->vid), secs,
+ msecs, backbone_gw->crc);
+ }
+ rcu_read_unlock();
+ }
+out:
+ if (primary_if)
+ batadv_hardif_free_ref(primary_if);
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff