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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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3
net/batman-adv/main.h
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@@ -83,6 +83,9 @@
#define BLA_PERIOD_LENGTH 10000 /* 10 seconds */
#define BLA_BACKBONE_TIMEOUT (BLA_PERIOD_LENGTH * 3)
#define BLA_CLAIM_TIMEOUT (BLA_PERIOD_LENGTH * 10)
#define DUPLIST_SIZE 16
#define DUPLIST_TIMEOUT 500 /* 500 ms */
/* don't reset again within 30 seconds */
#define RESET_PROTECTION_MS 30000
#define EXPECTED_SEQNO_RANGE 65536