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batman-adv: add broadcast duplicate check

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When multiple backbone gateways relay the same broadcast from the
backbone into the mesh, other nodes in the mesh may receive this
broadcast multiple times. To avoid this, the crc checksums of
received broadcasts are recorded and new broadcast packets with
the same content may be dropped if received by another gateway.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
This commit is contained in:
Simon Wunderlich 2012-01-22 20:00:24 +01:00 • committed by Antonio Quartulli
parent 20ff9d593f
commit fe2da6ff27
5 changed files with 91 additions and 0 deletions
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2
net/batman-adv/bridge_loop_avoidance.h
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@ -28,6 +28,8 @@ 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);
int bla_check_bcast_duplist(struct bat_priv *bat_priv,
struct bcast_packet *bcast_packet, int hdr_size);
void bla_update_orig_address(struct bat_priv *bat_priv,
struct hard_iface *primary_if,
struct hard_iface *oldif);