3.16.60-rc1 review patch. If anyone has any objections, please let me know.
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From: Marek Lindner mareklindner@neomailbox.ch
commit 16116dac23396e73c01eeee97b102e4833a4b205 upstream.
A translation table TVLV changset sent with an OGM consists of a number of headers (one per VLAN) plus the changeset itself (addition and/or deletion of entries).
The per-VLAN headers are used by OGM recipients for consistency checks. Said consistency check might determine that a full translation table request is needed to restore consistency. If the TT sender adds per-VLAN headers of empty VLANs into the OGM, recipients are led to believe to have reached an inconsistent state and thus request a full table update. The full table does not contain empty VLANs (due to missing entries) the cycle restarts when the next OGM is issued.
Consequently, when the translation table TVLV headers are composed, empty VLANs are to be excluded.
Fixes: 21a57f6e7a3b ("batman-adv: make the TT CRC logic VLAN specific") Signed-off-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -786,14 +786,21 @@ batadv_tt_prepare_tvlv_local_data(struct { struct batadv_tvlv_tt_vlan_data *tt_vlan; struct batadv_softif_vlan *vlan; - uint16_t num_vlan = 0, num_entries = 0, tvlv_len; + u16 num_vlan = 0; + u16 vlan_entries = 0; + u16 total_entries = 0; + u16 tvlv_len; uint8_t *tt_change_ptr; int change_offset;
spin_lock_bh(&bat_priv->softif_vlan_list_lock); hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + vlan_entries = atomic_read(&vlan->tt.num_entries); + if (vlan_entries < 1) + continue; + num_vlan++; - num_entries += atomic_read(&vlan->tt.num_entries); + total_entries += vlan_entries; }
change_offset = sizeof(**tt_data); @@ -801,7 +808,7 @@ batadv_tt_prepare_tvlv_local_data(struct
/* if tt_len is negative, allocate the space needed by the full table */ if (*tt_len < 0) - *tt_len = batadv_tt_len(num_entries); + *tt_len = batadv_tt_len(total_entries);
tvlv_len = *tt_len; tvlv_len += change_offset; @@ -818,6 +825,10 @@ batadv_tt_prepare_tvlv_local_data(struct
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1); hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + vlan_entries = atomic_read(&vlan->tt.num_entries); + if (vlan_entries < 1) + continue; + tt_vlan->vid = htons(vlan->vid); tt_vlan->crc = htonl(vlan->tt.crc);