As the backbone gateways are connected to the same backbone, they should announce the same clients on the backbone non-exclusively.
Signed-off-by: Simon Wunderlich siwu@hrz.tu-chemnitz.de --- [2011-10-27] Changes suggested by Marek Lindner: * move rcu_read_lock() more into the loops
Signed-off-by: Simon Wunderlich siwu@hrz.tu-chemnitz.de --- bridge_loop_avoidance.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++ bridge_loop_avoidance.h | 1 + routing.c | 6 +++++ translation-table.c | 17 ++++++++++++++- 4 files changed, 72 insertions(+), 2 deletions(-)
diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index bc4e57f..a787c96 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -24,6 +24,7 @@ #include "hard-interface.h" #include "originator.h" #include "bridge_loop_avoidance.h" +#include "translation-table.h" #include "send.h"
#include <linux/etherdevice.h> @@ -350,6 +351,7 @@ static struct backbone_gw *bla_get_backbone_gw(struct bat_priv *bat_priv, uint8_t *orig, short vid) { struct backbone_gw *entry; + struct orig_node *orig_node;
entry = backbone_hash_find(bat_priv, orig, vid);
@@ -377,6 +379,13 @@ static struct backbone_gw *bla_get_backbone_gw(struct bat_priv *bat_priv, hash_add(bat_priv->backbone_hash, compare_backbone_gw, choose_claim, entry, &entry->hash_entry);
+ /* this is a gateway now, remove any tt entries */ + orig_node = orig_hash_find(bat_priv, orig); + if (orig_node) { + tt_global_del_orig(bat_priv, orig_node, + "became a backbone gateway"); + orig_node_free_ref(orig_node); + } return entry; }
@@ -979,6 +988,47 @@ int bla_init(struct bat_priv *bat_priv) }
/** + * @bat_priv: the bat priv with all the soft interface information + * @orig: originator mac address + * + * check if the originator is a gateway for any VLAN ID. + * + * returns 1 if it is found, 0 otherwise + * + **/ + +int bla_is_backbone_gw_orig(struct bat_priv *bat_priv, uint8_t *orig) +{ + struct hashtable_t *hash = bat_priv->backbone_hash; + struct hlist_head *head; + struct hlist_node *node; + struct backbone_gw *backbone_gw; + int i; + + if (!atomic_read(&bat_priv->bridge_loop_avoidance)) + return 0; + + if (!hash) + return 0; + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { + if (compare_eth(backbone_gw->orig, orig)) { + rcu_read_unlock(); + return 1; + } + } + rcu_read_unlock(); + } + + return 0; +} + + +/** * @skb: the frame to be checked * @orig_node: the orig_node of the frame * @hdr_size: maximum length of the frame diff --git a/bridge_loop_avoidance.h b/bridge_loop_avoidance.h index 91aa515..bafcfac 100644 --- a/bridge_loop_avoidance.h +++ b/bridge_loop_avoidance.h @@ -24,6 +24,7 @@ int bla_tx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid); int bla_is_backbone_gw(struct sk_buff *skb, struct orig_node *orig_node, int hdr_size); int bla_claim_table_seq_print_text(struct seq_file *seq, void *offset); +int bla_is_backbone_gw_orig(struct bat_priv *bat_priv, uint8_t *orig); void bla_update_orig_address(struct bat_priv *bat_priv, uint8_t *newaddr); int bla_init(struct bat_priv *bat_priv); void bla_free(struct bat_priv *bat_priv); diff --git a/routing.c b/routing.c index 8050fb2..1554f60 100644 --- a/routing.c +++ b/routing.c @@ -675,6 +675,12 @@ int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) if (!is_my_mac(roam_adv_packet->dst)) return route_unicast_packet(skb, recv_if);
+ /* check if it is a backbone gateway. we don't accept + * roaming advertisement from it, as it has the same + * entries as we have. */ + if (bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) + goto out; + orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); if (!orig_node) goto out; diff --git a/translation-table.c b/translation-table.c index 946a872..06a51e5 100644 --- a/translation-table.c +++ b/translation-table.c @@ -27,6 +27,7 @@ #include "hash.h" #include "originator.h" #include "routing.h" +#include "bridge_loop_avoidance.h"
#include <linux/crc16.h>
@@ -1501,9 +1502,13 @@ out: bool send_tt_response(struct bat_priv *bat_priv, struct tt_query_packet *tt_request) { - if (is_my_mac(tt_request->dst)) + if (is_my_mac(tt_request->dst)) { + /* don't answer backbone gws! */ + if (bla_is_backbone_gw_orig(bat_priv, tt_request->src)) + return true; + return send_my_tt_response(bat_priv, tt_request); - else + } else return send_other_tt_response(bat_priv, tt_request); }
@@ -1608,6 +1613,10 @@ void handle_tt_response(struct bat_priv *bat_priv, tt_response->tt_data, (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
+ /* we should have never asked a backbone gw */ + if (bla_is_backbone_gw_orig(bat_priv, tt_response->src)) + goto out; + orig_node = orig_hash_find(bat_priv, tt_response->src); if (!orig_node) goto out; @@ -1922,6 +1931,10 @@ void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); bool full_table = true;
+ /* don't care about a backbone gateways updates. */ + if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) + return; + /* the ttvn increased by one -> we can apply the attached changes */ if (ttvn - orig_ttvn == 1) { /* the OGM could not contain the changes due to their size or