From 0eb01568f0b78f482eb2fd91d01e9eab344933aa Mon Sep 17 00:00:00 2001 From: Antonio Quartulli Date: Sun, 13 Oct 2013 02:50:20 +0200 Subject: batman-adv: include the sync-flags when compute the global/local table CRC Flags covered by TT_SYNC_MASK are kept in sync among the nodes in the network and therefore they have to be considered while computing the global/local table CRC. In this way a generic originator is able to understand if its table contains the correct flags or not. Bits from 4 to 7 in the TT flags fields are now reserved for "synchronized" flags only. This allows future developers to add more flags of this type without breaking compatibility. It's important to note that not all the remote TT flags are synchronised. This comes from the fact that some flags are used to inject an information once only. Signed-off-by: Antonio Quartulli Signed-off-by: Marek Lindner --- net/batman-adv/packet.h | 5 +++-- net/batman-adv/translation-table.c | 19 +++++++++++++++++++ net/batman-adv/types.h | 6 ++++++ 3 files changed, 28 insertions(+), 2 deletions(-) (limited to 'net/batman-adv') diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index 9fbcaacc345a..843b96ac355a 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -110,12 +110,13 @@ enum batadv_tt_data_flags { /* BATADV_TT_CLIENT flags. * Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to - * BIT(15) are used for local computation only + * BIT(15) are used for local computation only. + * Flags from BIT(4) to BIT(7) are kept in sync with the rest of the network. */ enum batadv_tt_client_flags { BATADV_TT_CLIENT_DEL = BIT(0), BATADV_TT_CLIENT_ROAM = BIT(1), - BATADV_TT_CLIENT_WIFI = BIT(2), + BATADV_TT_CLIENT_WIFI = BIT(4), BATADV_TT_CLIENT_NOPURGE = BIT(8), BATADV_TT_CLIENT_NEW = BIT(9), BATADV_TT_CLIENT_PENDING = BIT(10), diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 267780f4b438..4add57d4857f 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -1959,6 +1959,7 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, struct batadv_tt_global_entry *tt_global; struct hlist_head *head; uint32_t i, crc_tmp, crc = 0; + uint8_t flags; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -1997,6 +1998,13 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, crc_tmp = crc32c(0, &tt_common->vid, sizeof(tt_common->vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_common->flags & BATADV_TT_SYNC_MASK; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); } rcu_read_unlock(); @@ -2022,6 +2030,7 @@ static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv, struct batadv_tt_common_entry *tt_common; struct hlist_head *head; uint32_t i, crc_tmp, crc = 0; + uint8_t flags; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; @@ -2042,6 +2051,13 @@ static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv, crc_tmp = crc32c(0, &tt_common->vid, sizeof(tt_common->vid)); + + /* compute the CRC on flags that have to be kept in sync + * among nodes + */ + flags = tt_common->flags & BATADV_TT_SYNC_MASK; + crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags)); + crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN); } rcu_read_unlock(); @@ -3524,6 +3540,9 @@ int batadv_tt_init(struct batadv_priv *bat_priv) { int ret; + /* synchronized flags must be remote */ + BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK)); + ret = batadv_tt_local_init(bat_priv); if (ret < 0) return ret; diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 61297b6db85e..3c2116274de2 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -41,6 +41,12 @@ */ #define BATADV_TT_REMOTE_MASK 0x00FF +/** + * BATADV_TT_SYNC_MASK - bitmask of the flags that need to be kept in sync + * among the nodes. These flags are used to compute the global/local CRC + */ +#define BATADV_TT_SYNC_MASK 0x00F0 + /** * struct batadv_hard_iface_bat_iv - per hard interface B.A.T.M.A.N. IV data * @ogm_buff: buffer holding the OGM packet -- cgit v1.2.3