diff options
Diffstat (limited to 'net/batman-adv/bridge_loop_avoidance.c')
| -rw-r--r-- | net/batman-adv/bridge_loop_avoidance.c | 78 |
1 files changed, 40 insertions, 38 deletions
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c index 94e074235e15..f635da4b8ca6 100644 --- a/net/batman-adv/bridge_loop_avoidance.c +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -325,11 +325,6 @@ batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) } spin_unlock_bh(list_lock); } - - /* all claims gone, initialize CRC */ - spin_lock_bh(&backbone_gw->crc_lock); - backbone_gw->crc = BATADV_BLA_CRC_INIT; - spin_unlock_bh(&backbone_gw->crc_lock); } /** @@ -695,12 +690,14 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, struct batadv_bla_backbone_gw *old_backbone_gw; struct batadv_bla_claim search_claim; struct batadv_bla_claim *claim; - bool remove_crc = false; int hash_added; + u16 claim_crc; + bool changed; ether_addr_copy(search_claim.addr, mac); search_claim.vid = vid; claim = batadv_claim_hash_find(bat_priv, &search_claim); + claim_crc = crc16(0, mac, ETH_ALEN); /* create a new claim entry if it does not exist yet. */ if (!claim) { @@ -732,43 +729,56 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, kfree(claim); return; } + + spin_lock_bh(&backbone_gw->crc_lock); + backbone_gw->crc ^= claim_crc; + spin_unlock_bh(&backbone_gw->crc_lock); + + WRITE_ONCE(backbone_gw->lasttime, jiffies); + + batadv_claim_put(claim); + return; + } + + WRITE_ONCE(claim->lasttime, jiffies); + + /* replace backbone_gw atomically and adjust reference counters */ + spin_lock_bh(&claim->backbone_lock); + if (claim->backbone_gw != backbone_gw) { + changed = true; + + old_backbone_gw = claim->backbone_gw; + kref_get(&backbone_gw->refcount); + claim->backbone_gw = backbone_gw; } else { - WRITE_ONCE(claim->lasttime, jiffies); - if (claim->backbone_gw == backbone_gw) - /* no need to register a new backbone */ - goto claim_free_ref; + old_backbone_gw = NULL; + changed = false; + } + spin_unlock_bh(&claim->backbone_lock); + if (changed) { batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): changing ownership for %pM, vid %d to gw %pM\n", __func__, mac, batadv_print_vid(vid), backbone_gw->orig); - remove_crc = true; - } + /* add claim address to new backbone_gw */ + spin_lock_bh(&backbone_gw->crc_lock); + backbone_gw->crc ^= claim_crc; + spin_unlock_bh(&backbone_gw->crc_lock); - /* replace backbone_gw atomically and adjust reference counters */ - spin_lock_bh(&claim->backbone_lock); - old_backbone_gw = claim->backbone_gw; - kref_get(&backbone_gw->refcount); - claim->backbone_gw = backbone_gw; - spin_unlock_bh(&claim->backbone_lock); + WRITE_ONCE(backbone_gw->lasttime, jiffies); + } - if (remove_crc) { + if (old_backbone_gw) { /* remove claim address from old backbone_gw */ spin_lock_bh(&old_backbone_gw->crc_lock); - old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); + old_backbone_gw->crc ^= claim_crc; spin_unlock_bh(&old_backbone_gw->crc_lock); - } - batadv_backbone_gw_put(old_backbone_gw); - - /* add claim address to new backbone_gw */ - spin_lock_bh(&backbone_gw->crc_lock); - backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); - spin_unlock_bh(&backbone_gw->crc_lock); - WRITE_ONCE(backbone_gw->lasttime, jiffies); + batadv_backbone_gw_put(old_backbone_gw); + } -claim_free_ref: batadv_claim_put(claim); } @@ -940,26 +950,18 @@ static bool batadv_handle_unclaim(struct batadv_priv *bat_priv, const u8 *backbone_addr, const u8 *claim_addr, unsigned short vid) { - struct batadv_bla_backbone_gw *backbone_gw; - /* unclaim in any case if it is our own */ if (primary_if && batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) batadv_bla_send_claim(bat_priv, claim_addr, vid, BATADV_CLAIM_TYPE_UNCLAIM); - backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid); - - if (!backbone_gw) - return true; - /* this must be an UNCLAIM frame */ batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__, - claim_addr, batadv_print_vid(vid), backbone_gw->orig); + claim_addr, batadv_print_vid(vid), backbone_addr); batadv_bla_del_claim(bat_priv, claim_addr, vid); - batadv_backbone_gw_put(backbone_gw); return true; } |