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| author | Antonio Quartulli <ordex@autistici.org> | 2011-07-07 14:24:34 +0200 |
|---|---|---|
| committer | Marek Lindner <lindner_marek@yahoo.de> | 2011-07-07 18:49:26 +0200 |
| commit | a7f9becb7d27008af0f72f8449c110276b0df37d (patch) | |
| tree | 37adcfef1cde149943e7412e983ac5eb5e7aeb97 /net/batman-adv | |
| parent | 980d55b20a730cbabc74cdc57be9c47713dba57b (diff) | |
| download | lwn-a7f9becb7d27008af0f72f8449c110276b0df37d.tar.gz lwn-a7f9becb7d27008af0f72f8449c110276b0df37d.zip | |
batman-adv: request the full table if tt_crc doesn't match
In case of tt_crc mismatching for a certain orig_node after applying the
changes, the node must request the full table immediately.
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv')
| -rw-r--r-- | net/batman-adv/routing.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 2cb98bed1586..0f32c818874d 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -91,6 +91,18 @@ static void update_transtable(struct bat_priv *bat_priv, * to recompute it to spot any possible inconsistency * in the global table */ orig_node->tt_crc = tt_global_crc(bat_priv, orig_node); + + /* The ttvn alone is not enough to guarantee consistency + * because a single value could repesent different states + * (due to the wrap around). Thus a node has to check whether + * the resulting table (after applying the changes) is still + * consistent or not. E.g. a node could disconnect while its + * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case + * checking the CRC value is mandatory to detect the + * inconsistency */ + if (orig_node->tt_crc != tt_crc) + goto request_table; + /* Roaming phase is over: tables are in sync again. I can * unset the flag */ orig_node->tt_poss_change = false; |