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Diffstat (limited to 'net/batman-adv/routing.c')
-rw-r--r--net/batman-adv/routing.c572
1 files changed, 286 insertions, 286 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index c172f5d0e05a..bb1c3ec7e3ff 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -64,80 +64,97 @@ void slide_own_bcast_window(struct hard_iface *hard_iface)
}
}
-static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
- unsigned char *hna_buff, int hna_buff_len)
+static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node,
+ unsigned char *tt_buff, int tt_buff_len)
{
- if ((hna_buff_len != orig_node->hna_buff_len) ||
- ((hna_buff_len > 0) &&
- (orig_node->hna_buff_len > 0) &&
- (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
-
- if (orig_node->hna_buff_len > 0)
- hna_global_del_orig(bat_priv, orig_node,
- "originator changed hna");
-
- if ((hna_buff_len > 0) && (hna_buff))
- hna_global_add_orig(bat_priv, orig_node,
- hna_buff, hna_buff_len);
+ if ((tt_buff_len != orig_node->tt_buff_len) ||
+ ((tt_buff_len > 0) &&
+ (orig_node->tt_buff_len > 0) &&
+ (memcmp(orig_node->tt_buff, tt_buff, tt_buff_len) != 0))) {
+
+ if (orig_node->tt_buff_len > 0)
+ tt_global_del_orig(bat_priv, orig_node,
+ "originator changed tt");
+
+ if ((tt_buff_len > 0) && (tt_buff))
+ tt_global_add_orig(bat_priv, orig_node,
+ tt_buff, tt_buff_len);
}
}
static void update_route(struct bat_priv *bat_priv,
struct orig_node *orig_node,
struct neigh_node *neigh_node,
- unsigned char *hna_buff, int hna_buff_len)
+ unsigned char *tt_buff, int tt_buff_len)
{
- struct neigh_node *neigh_node_tmp;
+ struct neigh_node *curr_router;
+
+ curr_router = orig_node_get_router(orig_node);
/* route deleted */
- if ((orig_node->router) && (!neigh_node)) {
+ if ((curr_router) && (!neigh_node)) {
bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
orig_node->orig);
- hna_global_del_orig(bat_priv, orig_node,
+ tt_global_del_orig(bat_priv, orig_node,
"originator timed out");
- /* route added */
- } else if ((!orig_node->router) && (neigh_node)) {
+ /* route added */
+ } else if ((!curr_router) && (neigh_node)) {
bat_dbg(DBG_ROUTES, bat_priv,
"Adding route towards: %pM (via %pM)\n",
orig_node->orig, neigh_node->addr);
- hna_global_add_orig(bat_priv, orig_node,
- hna_buff, hna_buff_len);
+ tt_global_add_orig(bat_priv, orig_node,
+ tt_buff, tt_buff_len);
- /* route changed */
+ /* route changed */
} else {
bat_dbg(DBG_ROUTES, bat_priv,
"Changing route towards: %pM "
"(now via %pM - was via %pM)\n",
orig_node->orig, neigh_node->addr,
- orig_node->router->addr);
+ curr_router->addr);
}
+ if (curr_router)
+ neigh_node_free_ref(curr_router);
+
+ /* increase refcount of new best neighbor */
if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
neigh_node = NULL;
- neigh_node_tmp = orig_node->router;
- orig_node->router = neigh_node;
- if (neigh_node_tmp)
- neigh_node_free_ref(neigh_node_tmp);
+
+ spin_lock_bh(&orig_node->neigh_list_lock);
+ rcu_assign_pointer(orig_node->router, neigh_node);
+ spin_unlock_bh(&orig_node->neigh_list_lock);
+
+ /* decrease refcount of previous best neighbor */
+ if (curr_router)
+ neigh_node_free_ref(curr_router);
}
void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
- struct neigh_node *neigh_node, unsigned char *hna_buff,
- int hna_buff_len)
+ struct neigh_node *neigh_node, unsigned char *tt_buff,
+ int tt_buff_len)
{
+ struct neigh_node *router = NULL;
if (!orig_node)
- return;
+ goto out;
+
+ router = orig_node_get_router(orig_node);
- if (orig_node->router != neigh_node)
+ if (router != neigh_node)
update_route(bat_priv, orig_node, neigh_node,
- hna_buff, hna_buff_len);
- /* may be just HNA changed */
+ tt_buff, tt_buff_len);
+ /* may be just TT changed */
else
- update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
+ update_TT(bat_priv, orig_node, tt_buff, tt_buff_len);
+
+out:
+ if (router)
+ neigh_node_free_ref(router);
}
static int is_bidirectional_neigh(struct orig_node *orig_node,
@@ -152,65 +169,41 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
uint8_t orig_eq_count, neigh_rq_count, tq_own;
int tq_asym_penalty, ret = 0;
- if (orig_node == orig_neigh_node) {
- rcu_read_lock();
- hlist_for_each_entry_rcu(tmp_neigh_node, node,
- &orig_node->neigh_list, list) {
-
- if (!compare_eth(tmp_neigh_node->addr,
- orig_neigh_node->orig))
- continue;
-
- if (tmp_neigh_node->if_incoming != if_incoming)
- continue;
-
- if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
- continue;
-
- neigh_node = tmp_neigh_node;
- }
- rcu_read_unlock();
+ /* find corresponding one hop neighbor */
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_neigh_node->neigh_list, list) {
- if (!neigh_node)
- neigh_node = create_neighbor(orig_node,
- orig_neigh_node,
- orig_neigh_node->orig,
- if_incoming);
- if (!neigh_node)
- goto out;
+ if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
+ continue;
- neigh_node->last_valid = jiffies;
- } else {
- /* find packet count of corresponding one hop neighbor */
- rcu_read_lock();
- hlist_for_each_entry_rcu(tmp_neigh_node, node,
- &orig_neigh_node->neigh_list, list) {
+ if (tmp_neigh_node->if_incoming != if_incoming)
+ continue;
- if (!compare_eth(tmp_neigh_node->addr,
- orig_neigh_node->orig))
- continue;
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
- if (tmp_neigh_node->if_incoming != if_incoming)
- continue;
+ neigh_node = tmp_neigh_node;
+ break;
+ }
+ rcu_read_unlock();
- if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
- continue;
+ if (!neigh_node)
+ neigh_node = create_neighbor(orig_neigh_node,
+ orig_neigh_node,
+ orig_neigh_node->orig,
+ if_incoming);
- neigh_node = tmp_neigh_node;
- }
- rcu_read_unlock();
+ if (!neigh_node)
+ goto out;
- if (!neigh_node)
- neigh_node = create_neighbor(orig_neigh_node,
- orig_neigh_node,
- orig_neigh_node->orig,
- if_incoming);
- if (!neigh_node)
- goto out;
- }
+ /* if orig_node is direct neighbour update neigh_node last_valid */
+ if (orig_node == orig_neigh_node)
+ neigh_node->last_valid = jiffies;
orig_node->last_valid = jiffies;
+ /* find packet count of corresponding one hop neighbor */
spin_lock_bh(&orig_node->ogm_cnt_lock);
orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
neigh_rq_count = neigh_node->real_packet_count;
@@ -288,8 +281,8 @@ static void bonding_candidate_add(struct orig_node *orig_node,
struct neigh_node *neigh_node)
{
struct hlist_node *node;
- struct neigh_node *tmp_neigh_node;
- uint8_t best_tq, interference_candidate = 0;
+ struct neigh_node *tmp_neigh_node, *router = NULL;
+ uint8_t interference_candidate = 0;
spin_lock_bh(&orig_node->neigh_list_lock);
@@ -298,13 +291,12 @@ static void bonding_candidate_add(struct orig_node *orig_node,
neigh_node->orig_node->primary_addr))
goto candidate_del;
- if (!orig_node->router)
+ router = orig_node_get_router(orig_node);
+ if (!router)
goto candidate_del;
- best_tq = orig_node->router->tq_avg;
-
/* ... and is good enough to be considered */
- if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
+ if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
goto candidate_del;
/**
@@ -350,7 +342,9 @@ candidate_del:
out:
spin_unlock_bh(&orig_node->neigh_list_lock);
- return;
+
+ if (router)
+ neigh_node_free_ref(router);
}
/* copy primary address for bonding */
@@ -369,13 +363,14 @@ static void update_orig(struct bat_priv *bat_priv,
struct ethhdr *ethhdr,
struct batman_packet *batman_packet,
struct hard_iface *if_incoming,
- unsigned char *hna_buff, int hna_buff_len,
+ unsigned char *tt_buff, int tt_buff_len,
char is_duplicate)
{
struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+ struct neigh_node *router = NULL;
struct orig_node *orig_node_tmp;
struct hlist_node *node;
- int tmp_hna_buff_len;
+ int tmp_tt_buff_len;
uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
@@ -396,10 +391,12 @@ static void update_orig(struct bat_priv *bat_priv,
if (is_duplicate)
continue;
+ spin_lock_bh(&tmp_neigh_node->tq_lock);
ring_buffer_set(tmp_neigh_node->tq_recv,
&tmp_neigh_node->tq_index, 0);
tmp_neigh_node->tq_avg =
ring_buffer_avg(tmp_neigh_node->tq_recv);
+ spin_unlock_bh(&tmp_neigh_node->tq_lock);
}
if (!neigh_node) {
@@ -424,10 +421,12 @@ static void update_orig(struct bat_priv *bat_priv,
orig_node->flags = batman_packet->flags;
neigh_node->last_valid = jiffies;
+ spin_lock_bh(&neigh_node->tq_lock);
ring_buffer_set(neigh_node->tq_recv,
&neigh_node->tq_index,
batman_packet->tq);
neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
+ spin_unlock_bh(&neigh_node->tq_lock);
if (!is_duplicate) {
orig_node->last_ttl = batman_packet->ttl;
@@ -436,24 +435,23 @@ static void update_orig(struct bat_priv *bat_priv,
bonding_candidate_add(orig_node, neigh_node);
- tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
- batman_packet->num_hna * ETH_ALEN : hna_buff_len);
+ tmp_tt_buff_len = (tt_buff_len > batman_packet->num_tt * ETH_ALEN ?
+ batman_packet->num_tt * ETH_ALEN : tt_buff_len);
/* if this neighbor already is our next hop there is nothing
* to change */
- if (orig_node->router == neigh_node)
- goto update_hna;
+ router = orig_node_get_router(orig_node);
+ if (router == neigh_node)
+ goto update_tt;
/* if this neighbor does not offer a better TQ we won't consider it */
- if ((orig_node->router) &&
- (orig_node->router->tq_avg > neigh_node->tq_avg))
- goto update_hna;
+ if (router && (router->tq_avg > neigh_node->tq_avg))
+ goto update_tt;
/* if the TQ is the same and the link not more symetric we
* won't consider it either */
- if ((orig_node->router) &&
- (neigh_node->tq_avg == orig_node->router->tq_avg)) {
- orig_node_tmp = orig_node->router->orig_node;
+ if (router && (neigh_node->tq_avg == router->tq_avg)) {
+ orig_node_tmp = router->orig_node;
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
bcast_own_sum_orig =
orig_node_tmp->bcast_own_sum[if_incoming->if_num];
@@ -466,16 +464,16 @@ static void update_orig(struct bat_priv *bat_priv,
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
if (bcast_own_sum_orig >= bcast_own_sum_neigh)
- goto update_hna;
+ goto update_tt;
}
update_routes(bat_priv, orig_node, neigh_node,
- hna_buff, tmp_hna_buff_len);
+ tt_buff, tmp_tt_buff_len);
goto update_gw;
-update_hna:
- update_routes(bat_priv, orig_node, orig_node->router,
- hna_buff, tmp_hna_buff_len);
+update_tt:
+ update_routes(bat_priv, orig_node, router,
+ tt_buff, tmp_tt_buff_len);
update_gw:
if (orig_node->gw_flags != batman_packet->gw_flags)
@@ -496,6 +494,8 @@ unlock:
out:
if (neigh_node)
neigh_node_free_ref(neigh_node);
+ if (router)
+ neigh_node_free_ref(router);
}
/* checks whether the host restarted and is in the protection time.
@@ -597,12 +597,14 @@ out:
void receive_bat_packet(struct ethhdr *ethhdr,
struct batman_packet *batman_packet,
- unsigned char *hna_buff, int hna_buff_len,
+ unsigned char *tt_buff, int tt_buff_len,
struct hard_iface *if_incoming)
{
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
struct hard_iface *hard_iface;
struct orig_node *orig_neigh_node, *orig_node;
+ struct neigh_node *router = NULL, *router_router = NULL;
+ struct neigh_node *orig_neigh_router = NULL;
char has_directlink_flag;
char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
@@ -747,14 +749,15 @@ void receive_bat_packet(struct ethhdr *ethhdr,
goto out;
}
+ router = orig_node_get_router(orig_node);
+ if (router)
+ router_router = orig_node_get_router(router->orig_node);
+
/* avoid temporary routing loops */
- if ((orig_node->router) &&
- (orig_node->router->orig_node->router) &&
- (compare_eth(orig_node->router->addr,
- batman_packet->prev_sender)) &&
+ if (router && router_router &&
+ (compare_eth(router->addr, batman_packet->prev_sender)) &&
!(compare_eth(batman_packet->orig, batman_packet->prev_sender)) &&
- (compare_eth(orig_node->router->addr,
- orig_node->router->orig_node->router->addr))) {
+ (compare_eth(router->addr, router_router->addr))) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: ignoring all rebroadcast packets that "
"may make me loop (sender: %pM)\n", ethhdr->h_source);
@@ -769,9 +772,11 @@ void receive_bat_packet(struct ethhdr *ethhdr,
if (!orig_neigh_node)
goto out;
+ orig_neigh_router = orig_node_get_router(orig_neigh_node);
+
/* drop packet if sender is not a direct neighbor and if we
* don't route towards it */
- if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
+ if (!is_single_hop_neigh && (!orig_neigh_router)) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: OGM via unknown neighbor!\n");
goto out_neigh;
@@ -789,14 +794,14 @@ void receive_bat_packet(struct ethhdr *ethhdr,
((orig_node->last_real_seqno == batman_packet->seqno) &&
(orig_node->last_ttl - 3 <= batman_packet->ttl))))
update_orig(bat_priv, orig_node, ethhdr, batman_packet,
- if_incoming, hna_buff, hna_buff_len, is_duplicate);
+ if_incoming, tt_buff, tt_buff_len, is_duplicate);
/* is single hop (direct) neighbor */
if (is_single_hop_neigh) {
/* mark direct link on incoming interface */
schedule_forward_packet(orig_node, ethhdr, batman_packet,
- 1, hna_buff_len, if_incoming);
+ 1, tt_buff_len, if_incoming);
bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
"rebroadcast neighbor packet with direct link flag\n");
@@ -819,12 +824,19 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv,
"Forwarding packet: rebroadcast originator packet\n");
schedule_forward_packet(orig_node, ethhdr, batman_packet,
- 0, hna_buff_len, if_incoming);
+ 0, tt_buff_len, if_incoming);
out_neigh:
if ((orig_neigh_node) && (!is_single_hop_neigh))
orig_node_free_ref(orig_neigh_node);
out:
+ if (router)
+ neigh_node_free_ref(router);
+ if (router_router)
+ neigh_node_free_ref(router_router);
+ if (orig_neigh_router)
+ neigh_node_free_ref(orig_neigh_router);
+
orig_node_free_ref(orig_node);
}
@@ -868,8 +880,9 @@ int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
static int recv_my_icmp_packet(struct bat_priv *bat_priv,
struct sk_buff *skb, size_t icmp_len)
{
+ struct hard_iface *primary_if = NULL;
struct orig_node *orig_node = NULL;
- struct neigh_node *neigh_node = NULL;
+ struct neigh_node *router = NULL;
struct icmp_packet_rr *icmp_packet;
int ret = NET_RX_DROP;
@@ -881,28 +894,19 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
goto out;
}
- if (!bat_priv->primary_if)
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
goto out;
/* answer echo request (ping) */
/* get routing information */
- rcu_read_lock();
orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
-
if (!orig_node)
- goto unlock;
-
- neigh_node = orig_node->router;
-
- if (!neigh_node)
- goto unlock;
-
- if (!atomic_inc_not_zero(&neigh_node->refcount)) {
- neigh_node = NULL;
- goto unlock;
- }
+ goto out;
- rcu_read_unlock();
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
/* create a copy of the skb, if needed, to modify it. */
if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -911,20 +915,18 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
icmp_packet = (struct icmp_packet_rr *)skb->data;
memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
- memcpy(icmp_packet->orig,
- bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
icmp_packet->msg_type = ECHO_REPLY;
icmp_packet->ttl = TTL;
- send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ send_skb_packet(skb, router->if_incoming, router->addr);
ret = NET_RX_SUCCESS;
- goto out;
-unlock:
- rcu_read_unlock();
out:
- if (neigh_node)
- neigh_node_free_ref(neigh_node);
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ if (router)
+ neigh_node_free_ref(router);
if (orig_node)
orig_node_free_ref(orig_node);
return ret;
@@ -933,8 +935,9 @@ out:
static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
struct sk_buff *skb)
{
+ struct hard_iface *primary_if = NULL;
struct orig_node *orig_node = NULL;
- struct neigh_node *neigh_node = NULL;
+ struct neigh_node *router = NULL;
struct icmp_packet *icmp_packet;
int ret = NET_RX_DROP;
@@ -948,27 +951,18 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
goto out;
}
- if (!bat_priv->primary_if)
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
goto out;
/* get routing information */
- rcu_read_lock();
orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
-
if (!orig_node)
- goto unlock;
-
- neigh_node = orig_node->router;
-
- if (!neigh_node)
- goto unlock;
-
- if (!atomic_inc_not_zero(&neigh_node->refcount)) {
- neigh_node = NULL;
- goto unlock;
- }
+ goto out;
- rcu_read_unlock();
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
/* create a copy of the skb, if needed, to modify it. */
if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -977,20 +971,18 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
icmp_packet = (struct icmp_packet *)skb->data;
memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
- memcpy(icmp_packet->orig,
- bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
icmp_packet->msg_type = TTL_EXCEEDED;
icmp_packet->ttl = TTL;
- send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ send_skb_packet(skb, router->if_incoming, router->addr);
ret = NET_RX_SUCCESS;
- goto out;
-unlock:
- rcu_read_unlock();
out:
- if (neigh_node)
- neigh_node_free_ref(neigh_node);
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ if (router)
+ neigh_node_free_ref(router);
if (orig_node)
orig_node_free_ref(orig_node);
return ret;
@@ -1003,7 +995,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
struct icmp_packet_rr *icmp_packet;
struct ethhdr *ethhdr;
struct orig_node *orig_node = NULL;
- struct neigh_node *neigh_node = NULL;
+ struct neigh_node *router = NULL;
int hdr_size = sizeof(struct icmp_packet);
int ret = NET_RX_DROP;
@@ -1050,23 +1042,13 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
return recv_icmp_ttl_exceeded(bat_priv, skb);
/* get routing information */
- rcu_read_lock();
orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
-
if (!orig_node)
- goto unlock;
-
- neigh_node = orig_node->router;
-
- if (!neigh_node)
- goto unlock;
-
- if (!atomic_inc_not_zero(&neigh_node->refcount)) {
- neigh_node = NULL;
- goto unlock;
- }
+ goto out;
- rcu_read_unlock();
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
/* create a copy of the skb, if needed, to modify it. */
if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
@@ -1078,20 +1060,117 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
icmp_packet->ttl--;
/* route it */
- send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ send_skb_packet(skb, router->if_incoming, router->addr);
ret = NET_RX_SUCCESS;
- goto out;
-unlock:
- rcu_read_unlock();
out:
- if (neigh_node)
- neigh_node_free_ref(neigh_node);
+ if (router)
+ neigh_node_free_ref(router);
if (orig_node)
orig_node_free_ref(orig_node);
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 neigh_node *find_bond_router(struct orig_node *primary_orig,
+ struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct 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;
+}
+
+/* Interface Alternating: Use the best of the
+ * remaining candidates which are not using
+ * this interface.
+ *
+ * Increases the returned router's refcount */
+static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
+ struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct 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;
+
+ /* if we don't have a router yet
+ * or this one is better, choose it. */
+ if ((!router) ||
+ (tmp_neigh_node->tq_avg > router->tq_avg)) {
+ /* decrement refcount of
+ * previously selected router */
+ if (router)
+ neigh_node_free_ref(router);
+
+ router = tmp_neigh_node;
+ atomic_inc_not_zero(&router->refcount);
+ }
+
+ neigh_node_free_ref(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;
+}
+
/* find a suitable router for this originator, and use
* bonding if possible. increases the found neighbors
* refcount.*/
@@ -1101,15 +1180,16 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
{
struct orig_node *primary_orig_node;
struct orig_node *router_orig;
- struct neigh_node *router, *first_candidate, *tmp_neigh_node;
+ struct neigh_node *router;
static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
int bonding_enabled;
if (!orig_node)
return NULL;
- if (!orig_node->router)
- return NULL;
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto err;
/* without bonding, the first node should
* always choose the default router. */
@@ -1117,12 +1197,9 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
rcu_read_lock();
/* select default router to output */
- router = orig_node->router;
- router_orig = orig_node->router->orig_node;
- if (!router_orig || !atomic_inc_not_zero(&router->refcount)) {
- rcu_read_unlock();
- return NULL;
- }
+ router_orig = router->orig_node;
+ if (!router_orig)
+ goto err_unlock;
if ((!recv_if) && (!bonding_enabled))
goto return_router;
@@ -1151,91 +1228,26 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
if (atomic_read(&primary_orig_node->bond_candidates) < 2)
goto return_router;
-
/* all nodes between should choose a candidate which
* is is not on the interface where the packet came
* in. */
neigh_node_free_ref(router);
- first_candidate = NULL;
- router = NULL;
-
- if (bonding_enabled) {
- /* in the bonding case, send the packets in a round
- * robin fashion over the remaining interfaces. */
-
- list_for_each_entry_rcu(tmp_neigh_node,
- &primary_orig_node->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 &&
- atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
- 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) {
- rcu_read_unlock();
- return NULL;
- }
-
- /* selected should point to the next element
- * after the current router */
- spin_lock_bh(&primary_orig_node->neigh_list_lock);
- /* this is a list_move(), which unfortunately
- * does not exist as rcu version */
- list_del_rcu(&primary_orig_node->bond_list);
- list_add_rcu(&primary_orig_node->bond_list,
- &router->bonding_list);
- spin_unlock_bh(&primary_orig_node->neigh_list_lock);
-
- } else {
- /* if bonding is disabled, use the best of the
- * remaining candidates which are not using
- * this interface. */
- list_for_each_entry_rcu(tmp_neigh_node,
- &primary_orig_node->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;
-
- /* if we don't have a router yet
- * or this one is better, choose it. */
- if ((!router) ||
- (tmp_neigh_node->tq_avg > router->tq_avg)) {
- /* decrement refcount of
- * previously selected router */
- if (router)
- neigh_node_free_ref(router);
-
- router = tmp_neigh_node;
- atomic_inc_not_zero(&router->refcount);
- }
-
- neigh_node_free_ref(tmp_neigh_node);
- }
+ if (bonding_enabled)
+ router = find_bond_router(primary_orig_node, recv_if);
+ else
+ router = find_ifalter_router(primary_orig_node, recv_if);
- /* use the first candidate if nothing was found. */
- if (!router && first_candidate &&
- atomic_inc_not_zero(&first_candidate->refcount))
- router = first_candidate;
- }
return_router:
rcu_read_unlock();
return router;
+err_unlock:
+ rcu_read_unlock();
+err:
+ if (router)
+ neigh_node_free_ref(router);
+ return NULL;
}
static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
@@ -1284,13 +1296,10 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
}
/* get routing information */
- rcu_read_lock();
orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
if (!orig_node)
- goto unlock;
-
- rcu_read_unlock();
+ goto out;
/* find_router() increases neigh_nodes refcount if found. */
neigh_node = find_router(bat_priv, orig_node, recv_if);
@@ -1336,10 +1345,7 @@ int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
/* route it */
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
ret = NET_RX_SUCCESS;
- goto out;
-unlock:
- rcu_read_unlock();
out:
if (neigh_node)
neigh_node_free_ref(neigh_node);
@@ -1438,13 +1444,10 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
if (bcast_packet->ttl < 2)
goto out;
- rcu_read_lock();
orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
if (!orig_node)
- goto rcu_unlock;
-
- rcu_read_unlock();
+ goto out;
spin_lock_bh(&orig_node->bcast_seqno_lock);
@@ -1475,9 +1478,6 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
ret = NET_RX_SUCCESS;
goto out;
-rcu_unlock:
- rcu_read_unlock();
- goto out;
spin_unlock:
spin_unlock_bh(&orig_node->bcast_seqno_lock);
out: