-/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
+/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "main.h"
static int batadv_route_unicast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
+/**
+ * _batadv_update_route - set the router for this originator
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: orig node which is to be configured
+ * @recv_if: the receive interface for which this route is set
+ * @neigh_node: neighbor which should be the next router
+ *
+ * This function does not perform any error checks
+ */
static void _batadv_update_route(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
+ struct batadv_hard_iface *recv_if,
struct batadv_neigh_node *neigh_node)
{
+ struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *curr_router;
- curr_router = batadv_orig_node_get_router(orig_node);
+ orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if);
+ if (!orig_ifinfo)
+ return;
+
+ rcu_read_lock();
+ curr_router = rcu_dereference(orig_ifinfo->router);
+ if (curr_router && !atomic_inc_not_zero(&curr_router->refcount))
+ curr_router = NULL;
+ rcu_read_unlock();
/* route deleted */
if ((curr_router) && (!neigh_node)) {
neigh_node = NULL;
spin_lock_bh(&orig_node->neigh_list_lock);
- rcu_assign_pointer(orig_node->router, neigh_node);
+ rcu_assign_pointer(orig_ifinfo->router, neigh_node);
spin_unlock_bh(&orig_node->neigh_list_lock);
+ batadv_orig_ifinfo_free_ref(orig_ifinfo);
/* decrease refcount of previous best neighbor */
if (curr_router)
batadv_neigh_node_free_ref(curr_router);
}
+/**
+ * batadv_update_route - set the router for this originator
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: orig node which is to be configured
+ * @recv_if: the receive interface for which this route is set
+ * @neigh_node: neighbor which should be the next router
+ */
void batadv_update_route(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
+ struct batadv_hard_iface *recv_if,
struct batadv_neigh_node *neigh_node)
{
struct batadv_neigh_node *router = NULL;
if (!orig_node)
goto out;
- router = batadv_orig_node_get_router(orig_node);
+ router = batadv_orig_router_get(orig_node, recv_if);
if (router != neigh_node)
- _batadv_update_route(bat_priv, orig_node, neigh_node);
+ _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node);
out:
if (router)
batadv_neigh_node_free_ref(router);
}
-/* caller must hold the neigh_list_lock */
-void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node,
- struct batadv_neigh_node *neigh_node)
-{
- /* this neighbor is not part of our candidate list */
- if (list_empty(&neigh_node->bonding_list))
- goto out;
-
- list_del_rcu(&neigh_node->bonding_list);
- INIT_LIST_HEAD(&neigh_node->bonding_list);
- batadv_neigh_node_free_ref(neigh_node);
- atomic_dec(&orig_node->bond_candidates);
-
-out:
- return;
-}
-
-/**
- * batadv_bonding_candidate_add - consider a new link for bonding mode towards
- * the given originator
- * @bat_priv: the bat priv with all the soft interface information
- * @orig_node: the target node
- * @neigh_node: the neighbor representing the new link to consider for bonding
- * mode
- */
-void batadv_bonding_candidate_add(struct batadv_priv *bat_priv,
- struct batadv_orig_node *orig_node,
- struct batadv_neigh_node *neigh_node)
-{
- struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
- struct batadv_neigh_node *tmp_neigh_node, *router = NULL;
- uint8_t interference_candidate = 0;
-
- spin_lock_bh(&orig_node->neigh_list_lock);
-
- /* only consider if it has the same primary address ... */
- if (!batadv_compare_eth(orig_node->orig,
- neigh_node->orig_node->primary_addr))
- goto candidate_del;
-
- router = batadv_orig_node_get_router(orig_node);
- if (!router)
- goto candidate_del;
-
-
- /* ... and is good enough to be considered */
- if (bao->bat_neigh_is_equiv_or_better(neigh_node, router))
- goto candidate_del;
-
- /* check if we have another candidate with the same mac address or
- * interface. If we do, we won't select this candidate because of
- * possible interference.
- */
- hlist_for_each_entry_rcu(tmp_neigh_node,
- &orig_node->neigh_list, list) {
- if (tmp_neigh_node == neigh_node)
- continue;
-
- /* we only care if the other candidate is even
- * considered as candidate.
- */
- if (list_empty(&tmp_neigh_node->bonding_list))
- continue;
-
- if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
- (batadv_compare_eth(neigh_node->addr,
- tmp_neigh_node->addr))) {
- interference_candidate = 1;
- break;
- }
- }
-
- /* don't care further if it is an interference candidate */
- if (interference_candidate)
- goto candidate_del;
-
- /* this neighbor already is part of our candidate list */
- if (!list_empty(&neigh_node->bonding_list))
- goto out;
-
- if (!atomic_inc_not_zero(&neigh_node->refcount))
- goto out;
-
- list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
- atomic_inc(&orig_node->bond_candidates);
- goto out;
-
-candidate_del:
- batadv_bonding_candidate_del(orig_node, neigh_node);
-
-out:
- spin_unlock_bh(&orig_node->neigh_list_lock);
-
- if (router)
- batadv_neigh_node_free_ref(router);
-}
-
-/* copy primary address for bonding */
-void
-batadv_bonding_save_primary(const struct batadv_orig_node *orig_node,
- struct batadv_orig_node *orig_neigh_node,
- const struct batadv_ogm_packet *batman_ogm_packet)
-{
- if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
- return;
-
- memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
-}
-
/* checks whether the host restarted and is in the protection time.
* returns:
* 0 if the packet is to be accepted
return ret;
}
-/* In the bonding case, send the packets in a round
- * robin fashion over the remaining interfaces.
- *
- * This method rotates the bonding list and increases the
- * returned router's refcount.
- */
-static struct batadv_neigh_node *
-batadv_find_bond_router(struct batadv_orig_node *primary_orig,
- const struct batadv_hard_iface *recv_if)
-{
- struct batadv_neigh_node *tmp_neigh_node;
- struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
-
- rcu_read_lock();
- list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
- bonding_list) {
- if (!first_candidate)
- first_candidate = tmp_neigh_node;
-
- /* recv_if == NULL on the first node. */
- if (tmp_neigh_node->if_incoming == recv_if)
- continue;
-
- if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
- continue;
-
- router = tmp_neigh_node;
- break;
- }
-
- /* use the first candidate if nothing was found. */
- if (!router && first_candidate &&
- atomic_inc_not_zero(&first_candidate->refcount))
- router = first_candidate;
-
- if (!router)
- goto out;
-
- /* selected should point to the next element
- * after the current router
- */
- spin_lock_bh(&primary_orig->neigh_list_lock);
- /* this is a list_move(), which unfortunately
- * does not exist as rcu version
- */
- list_del_rcu(&primary_orig->bond_list);
- list_add_rcu(&primary_orig->bond_list,
- &router->bonding_list);
- spin_unlock_bh(&primary_orig->neigh_list_lock);
-
-out:
- rcu_read_unlock();
- return router;
-}
-
-/**
- * batadv_find_ifalter_router - find the best of the remaining candidates which
- * are not using this interface
- * @bat_priv: the bat priv with all the soft interface information
- * @primary_orig: the destination
- * @recv_if: the interface that the router returned by this function has to not
- * use
- *
- * Returns the best candidate towards primary_orig that is not using recv_if.
- * Increases the returned neighbor's refcount
- */
-static struct batadv_neigh_node *
-batadv_find_ifalter_router(struct batadv_priv *bat_priv,
- struct batadv_orig_node *primary_orig,
- const struct batadv_hard_iface *recv_if)
-{
- struct batadv_neigh_node *router = NULL, *first_candidate = NULL;
- struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
- struct batadv_neigh_node *tmp_neigh_node;
-
- rcu_read_lock();
- list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
- bonding_list) {
- if (!first_candidate)
- first_candidate = tmp_neigh_node;
-
- /* recv_if == NULL on the first node. */
- if (tmp_neigh_node->if_incoming == recv_if)
- continue;
-
- if (router && bao->bat_neigh_cmp(tmp_neigh_node, router))
- continue;
-
- if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
- continue;
-
- /* decrement refcount of previously selected router */
- if (router)
- batadv_neigh_node_free_ref(router);
-
- /* we found a better router (or at least one valid router) */
- router = tmp_neigh_node;
- }
-
- /* use the first candidate if nothing was found. */
- if (!router && first_candidate &&
- atomic_inc_not_zero(&first_candidate->refcount))
- router = first_candidate;
-
- rcu_read_unlock();
- return router;
-}
-
/**
* batadv_check_unicast_packet - Check for malformed unicast packets
* @bat_priv: the bat priv with all the soft interface information
return 0;
}
-/* find a suitable router for this originator, and use
- * bonding if possible. increases the found neighbors
- * refcount.
+/**
+ * batadv_find_router - find a suitable router for this originator
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: the destination node
+ * @recv_if: pointer to interface this packet was received on
+ *
+ * Returns the router which should be used for this orig_node on
+ * this interface, or NULL if not available.
*/
struct batadv_neigh_node *
batadv_find_router(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
- const struct batadv_hard_iface *recv_if)
+ struct batadv_hard_iface *recv_if)
{
- struct batadv_orig_node *primary_orig_node;
- struct batadv_orig_node *router_orig;
- struct batadv_neigh_node *router;
- static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
- int bonding_enabled;
- uint8_t *primary_addr;
+ struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+ struct batadv_neigh_node *first_candidate_router = NULL;
+ struct batadv_neigh_node *next_candidate_router = NULL;
+ struct batadv_neigh_node *router, *cand_router = NULL;
+ struct batadv_neigh_node *last_cand_router = NULL;
+ struct batadv_orig_ifinfo *cand, *first_candidate = NULL;
+ struct batadv_orig_ifinfo *next_candidate = NULL;
+ struct batadv_orig_ifinfo *last_candidate;
+ bool last_candidate_found = false;
if (!orig_node)
return NULL;
- router = batadv_orig_node_get_router(orig_node);
- if (!router)
- goto err;
+ router = batadv_orig_router_get(orig_node, recv_if);
- /* without bonding, the first node should
- * always choose the default router.
+ /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop)
+ * and if activated.
+ */
+ if (recv_if == BATADV_IF_DEFAULT || !atomic_read(&bat_priv->bonding) ||
+ !router)
+ return router;
+
+ /* bonding: loop through the list of possible routers found
+ * for the various outgoing interfaces and find a candidate after
+ * the last chosen bonding candidate (next_candidate). If no such
+ * router is found, use the first candidate found (the previously
+ * chosen bonding candidate might have been the last one in the list).
+ * If this can't be found either, return the previously choosen
+ * router - obviously there are no other candidates.
*/
- bonding_enabled = atomic_read(&bat_priv->bonding);
-
rcu_read_lock();
- /* select default router to output */
- router_orig = router->orig_node;
- if (!router_orig)
- goto err_unlock;
+ last_candidate = orig_node->last_bonding_candidate;
+ if (last_candidate)
+ last_cand_router = rcu_dereference(last_candidate->router);
- if ((!recv_if) && (!bonding_enabled))
- goto return_router;
+ hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) {
+ /* acquire some structures and references ... */
+ if (!atomic_inc_not_zero(&cand->refcount))
+ continue;
- primary_addr = router_orig->primary_addr;
+ cand_router = rcu_dereference(cand->router);
+ if (!cand_router)
+ goto next;
- /* if we have something in the primary_addr, we can search
- * for a potential bonding candidate.
- */
- if (batadv_compare_eth(primary_addr, zero_mac))
- goto return_router;
+ if (!atomic_inc_not_zero(&cand_router->refcount)) {
+ cand_router = NULL;
+ goto next;
+ }
- /* find the orig_node which has the primary interface. might
- * even be the same as our router_orig in many cases
- */
- if (batadv_compare_eth(primary_addr, router_orig->orig)) {
- primary_orig_node = router_orig;
- } else {
- primary_orig_node = batadv_orig_hash_find(bat_priv,
- primary_addr);
- if (!primary_orig_node)
- goto return_router;
+ /* alternative candidate should be good enough to be
+ * considered
+ */
+ if (!bao->bat_neigh_is_equiv_or_better(cand_router,
+ cand->if_outgoing,
+ router, recv_if))
+ goto next;
+
+ /* don't use the same router twice */
+ if (last_cand_router == cand_router)
+ goto next;
+
+ /* mark the first possible candidate */
+ if (!first_candidate) {
+ atomic_inc(&cand_router->refcount);
+ atomic_inc(&cand->refcount);
+ first_candidate = cand;
+ first_candidate_router = cand_router;
+ }
+
+ /* check if the loop has already passed the previously selected
+ * candidate ... this function should select the next candidate
+ * AFTER the previously used bonding candidate.
+ */
+ if (!last_candidate || last_candidate_found) {
+ next_candidate = cand;
+ next_candidate_router = cand_router;
+ break;
+ }
- batadv_orig_node_free_ref(primary_orig_node);
+ if (last_candidate == cand)
+ last_candidate_found = true;
+next:
+ /* free references */
+ if (cand_router) {
+ batadv_neigh_node_free_ref(cand_router);
+ cand_router = NULL;
+ }
+ batadv_orig_ifinfo_free_ref(cand);
}
+ rcu_read_unlock();
- /* with less than 2 candidates, we can't do any
- * bonding and prefer the original router.
- */
- if (atomic_read(&primary_orig_node->bond_candidates) < 2)
- goto return_router;
+ /* last_bonding_candidate is reset below, remove the old reference. */
+ if (orig_node->last_bonding_candidate)
+ batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate);
- /* all nodes between should choose a candidate which
- * is is not on the interface where the packet came
- * in.
+ /* After finding candidates, handle the three cases:
+ * 1) there is a next candidate, use that
+ * 2) there is no next candidate, use the first of the list
+ * 3) there is no candidate at all, return the default router
*/
- batadv_neigh_node_free_ref(router);
+ if (next_candidate) {
+ batadv_neigh_node_free_ref(router);
- if (bonding_enabled)
- router = batadv_find_bond_router(primary_orig_node, recv_if);
- else
- router = batadv_find_ifalter_router(bat_priv, primary_orig_node,
- recv_if);
+ /* remove references to first candidate, we don't need it. */
+ if (first_candidate) {
+ batadv_neigh_node_free_ref(first_candidate_router);
+ batadv_orig_ifinfo_free_ref(first_candidate);
+ }
+ router = next_candidate_router;
+ orig_node->last_bonding_candidate = next_candidate;
+ } else if (first_candidate) {
+ batadv_neigh_node_free_ref(router);
-return_router:
- if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE)
- goto err_unlock;
+ /* refcounting has already been done in the loop above. */
+ router = first_candidate_router;
+ orig_node->last_bonding_candidate = first_candidate;
+ } else {
+ orig_node->last_bonding_candidate = NULL;
+ }
- rcu_read_unlock();
return router;
-err_unlock:
- rcu_read_unlock();
-err:
- if (router)
- batadv_neigh_node_free_ref(router);
- return NULL;
}
static int batadv_route_unicast_packet(struct sk_buff *skb,
int hdr_size = sizeof(*bcast_packet);
int ret = NET_RX_DROP;
int32_t seq_diff;
+ uint32_t seqno;
/* drop packet if it has not necessary minimum size */
if (unlikely(!pskb_may_pull(skb, hdr_size)))
spin_lock_bh(&orig_node->bcast_seqno_lock);
+ seqno = ntohl(bcast_packet->seqno);
/* check whether the packet is a duplicate */
if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno,
- ntohl(bcast_packet->seqno)))
+ seqno))
goto spin_unlock;
- seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
+ seq_diff = seqno - orig_node->last_bcast_seqno;
/* check whether the packet is old and the host just restarted. */
if (batadv_window_protected(bat_priv, seq_diff,
* if required.
*/
if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
- orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
+ orig_node->last_bcast_seqno = seqno;
spin_unlock_bh(&orig_node->bcast_seqno_lock);
projects / firefly-linux-kernel-4.4.55.git / blobdiff