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batman-adv: tvlv - convert tt data sent within OGMs

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The translation table meta data (version number, crc checksum, etc)
as well as the translation table diff propgated within OGMs now uses
the newly introduced tvlv infrastructure.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
This commit is contained in:
Marek Lindner 2013-04-23 21:40:01 +08:00 committed by Antonio Quartulli
parent 3f4841ffb3
commit e1bf0c1409
5 changed files with 187 additions and 158 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
net/batman-adv/bat_iv_ogm.c
View File

@ -137,8 +137,6 @@ static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
batadv_ogm_packet->flags = BATADV_NO_FLAGS;
batadv_ogm_packet->reserved = 0;
batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
batadv_ogm_packet->tt_num_changes = 0;
batadv_ogm_packet->ttvn = 0;
res = 0;
@ -257,14 +255,14 @@ static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
fwd_str = "Sending own";
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
"%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
fwd_str, (packet_num > 0 ? "aggregated " : ""),
batadv_ogm_packet->orig,
ntohl(batadv_ogm_packet->seqno),
batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
(batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
"on" : "off"),
batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
hard_iface->net_dev->name,
hard_iface->net_dev->dev_addr);
buff_pos += BATADV_OGM_HLEN;
@ -689,17 +687,22 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
struct batadv_ogm_packet *batadv_ogm_packet;
struct batadv_hard_iface *primary_if;
int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
int vis_server, tt_num_changes = 0;
int vis_server;
uint32_t seqno;
uint16_t tvlv_len = 0;
vis_server = atomic_read(&bat_priv->vis_mode);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (hard_iface == primary_if)
if (hard_iface == primary_if) {
/* tt changes have to be committed before the tvlv data is
* appended as it may alter the tt tvlv container
*/
batadv_tt_local_commit_changes(bat_priv);
tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
ogm_buff_len,
BATADV_OGM_HLEN);
}
batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
batadv_ogm_packet->tvlv_len = htons(tvlv_len);
@ -709,11 +712,6 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
batadv_ogm_packet->seqno = htonl(seqno);
atomic_inc(&hard_iface->bat_iv.ogm_seqno);
batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
if (tt_num_changes >= 0)
batadv_ogm_packet->tt_num_changes = tt_num_changes;
if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
else
@ -814,11 +812,11 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
*/
router = batadv_orig_node_get_router(orig_node);
if (router == neigh_node)
goto update_tt;
goto out;
/* if this neighbor does not offer a better TQ we won't consider it */
if (router && (router->tq_avg > neigh_node->tq_avg))
goto update_tt;
goto out;
/* if the TQ is the same and the link not more symmetric we
* won't consider it either
@ -837,22 +835,10 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
if (sum_orig >= sum_neigh)
goto update_tt;
goto out;
}
batadv_update_route(bat_priv, orig_node, neigh_node);
update_tt:
/* I have to check for transtable changes only if the OGM has been
* sent through a primary interface
*/
if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
(batadv_ogm_packet->header.ttl > 2)) ||
(batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
batadv_ogm_packet->tt_num_changes,
batadv_ogm_packet->ttvn,
ntohs(batadv_ogm_packet->tt_crc));
goto out;
unlock:
@ -1103,13 +1089,11 @@ static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
is_single_hop_neigh = true;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, tq %d, TTL %d, V %d, IDF %d)\n",
"Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
ethhdr->h_source, if_incoming->net_dev->name,
if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
batadv_ogm_packet->prev_sender,
ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
ntohs(batadv_ogm_packet->tt_crc),
batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->tq,
batadv_ogm_packet->header.ttl,
batadv_ogm_packet->header.version, has_directlink_flag);

51
net/batman-adv/packet.h
View File

@ -86,14 +86,21 @@ enum batadv_unicast_frag_flags {
/* TT_QUERY subtypes */
#define BATADV_TT_QUERY_TYPE_MASK 0x3
enum batadv_tt_query_packettype {
BATADV_TT_REQUEST = 0,
BATADV_TT_RESPONSE = 1,
};
/* tt data subtypes */
#define BATADV_TT_DATA_TYPE_MASK 0x0F
/* TT_QUERY flags */
enum batadv_tt_query_flags {
BATADV_TT_FULL_TABLE = BIT(2),
/**
* enum batadv_tt_data_flags - flags for tt data tvlv
* @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
* @BATADV_TT_REQUEST: TT request message
* @BATADV_TT_RESPONSE: TT response message
* @BATADV_TT_FULL_TABLE: contains full table to replace existing table
*/
enum batadv_tt_data_flags {
BATADV_TT_OGM_DIFF = BIT(0),
BATADV_TT_REQUEST = BIT(1),
BATADV_TT_RESPONSE = BIT(2),
BATADV_TT_FULL_TABLE = BIT(4),
};
/* BATADV_TT_CLIENT flags.
@ -123,11 +130,13 @@ enum batadv_bla_claimframe {
* @BATADV_TVLV_GW: gateway tvlv
* @BATADV_TVLV_DAT: distributed arp table tvlv
* @BATADV_TVLV_NC: network coding tvlv
* @BATADV_TVLV_TT: translation table tvlv
*/
enum batadv_tvlv_type {
BATADV_TVLV_GW = 0x01,
BATADV_TVLV_DAT = 0x02,
BATADV_TVLV_NC = 0x03,
BATADV_TVLV_TT = 0x04,
};
/* the destination hardware field in the ARP frame is used to
@ -161,9 +170,6 @@ struct batadv_ogm_packet {
uint8_t prev_sender[ETH_ALEN];
uint8_t reserved;
uint8_t tq;
uint8_t tt_num_changes;
uint8_t ttvn; /* translation table version number */
__be16 tt_crc;
__be16 tvlv_len;
} __packed;
@ -375,4 +381,29 @@ struct batadv_tvlv_gateway_data {
__be32 bandwidth_up;
};
/**
* struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
* @flags: translation table flags (see batadv_tt_data_flags)
* @ttvn: translation table version number
* @crc: crc16 checksum of the local translation table
*/
struct batadv_tvlv_tt_data {
uint8_t flags;
uint8_t ttvn;
__be16 crc;
};
/**
* struct batadv_tvlv_tt_change - translation table diff data
* @flags: status indicators concerning the non-mesh client (see
* batadv_tt_client_flags)
* @reserved: reserved field
* @addr: mac address of non-mesh client that triggered this tt change
*/
struct batadv_tvlv_tt_change {
uint8_t flags;
uint8_t reserved;
uint8_t addr[ETH_ALEN];
};
#endif /* _NET_BATMAN_ADV_PACKET_H_ */

240
net/batman-adv/translation-table.c
View File

@ -180,11 +180,11 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
bool del_op_requested, del_op_entry;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = flags;
tt_change_node->change.reserved = 0;
memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
del_op_requested = flags & BATADV_TT_CLIENT_DEL;
@ -376,71 +376,52 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
batadv_tt_global_entry_free_ref(tt_global);
}
static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len,
int new_packet_len)
/**
* batadv_tt_tvlv_container_update - update the translation table tvlv container
* after local tt changes have been committed
* @bat_priv: the bat priv with all the soft interface information
*/
static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
{
unsigned char *new_buff;
struct batadv_tt_change_node *entry, *safe;
struct batadv_tvlv_tt_data *tt_data;
struct batadv_tvlv_tt_change *tt_change;
int tt_diff_len = 0, tt_change_len = 0;
int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
/* keep old buffer if kmalloc should fail */
if (new_buff) {
memcpy(new_buff, *packet_buff, min_packet_len);
kfree(*packet_buff);
*packet_buff = new_buff;
*packet_buff_len = new_packet_len;
}
}
static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
int req_len;
req_len = min_packet_len;
req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
tt_diff_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
/* if we have too many changes for one packet don't send any
* and wait for the tt table request which will be fragmented
*/
if (req_len > bat_priv->soft_iface->mtu)
req_len = min_packet_len;
if (tt_diff_len > bat_priv->soft_iface->mtu)
tt_diff_len = 0;
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
min_packet_len, req_len);
}
tt_data = kzalloc(sizeof(*tt_data) + tt_diff_len, GFP_ATOMIC);
if (!tt_data)
return;
static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct batadv_tt_change_node *entry, *safe;
int count = 0, tot_changes = 0, new_len;
unsigned char *tt_buff;
tt_data->flags = BATADV_TT_OGM_DIFF;
tt_data->ttvn = atomic_read(&bat_priv->tt.vn);
tt_data->crc = htons(bat_priv->tt.local_crc);
batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
packet_buff_len, min_packet_len);
if (tt_diff_len == 0)
goto container_register;
new_len = *packet_buff_len - min_packet_len;
tt_buff = *packet_buff + min_packet_len;
if (new_len > 0)
tot_changes = new_len / batadv_tt_len(1);
tt_diff_entries_num = tt_diff_len / batadv_tt_len(1);
spin_lock_bh(&bat_priv->tt.changes_list_lock);
atomic_set(&bat_priv->tt.local_changes, 0);
tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1);
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
if (count < tot_changes) {
memcpy(tt_buff + batadv_tt_len(count),
&entry->change, sizeof(struct batadv_tt_change));
count++;
if (tt_diff_entries_count < tt_diff_entries_num) {
memcpy(tt_change + tt_diff_entries_count,
&entry->change,
sizeof(struct batadv_tvlv_tt_change));
tt_diff_entries_count++;
}
list_del(&entry->list);
kfree(entry);
@ -452,20 +433,25 @@ static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
kfree(bat_priv->tt.last_changeset);
bat_priv->tt.last_changeset_len = 0;
bat_priv->tt.last_changeset = NULL;
tt_change_len = batadv_tt_len(tt_diff_entries_count);
/* check whether this new OGM has no changes due to size problems */
if (new_len > 0) {
if (tt_diff_entries_count > 0) {
/* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
if (bat_priv->tt.last_changeset) {
memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
bat_priv->tt.last_changeset_len = new_len;
memcpy(bat_priv->tt.last_changeset,
tt_change, tt_change_len);
bat_priv->tt.last_changeset_len = tt_diff_len;
}
}
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
return count;
container_register:
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
sizeof(*tt_data) + tt_change_len);
kfree(tt_data);
}
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
@ -1504,7 +1490,7 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_buff,
uint8_t tt_num_changes)
uint16_t tt_num_changes)
{
uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
@ -2126,25 +2112,6 @@ void batadv_handle_tt_response(struct batadv_priv *bat_priv,
batadv_orig_node_free_ref(orig_node);
}
int batadv_tt_init(struct batadv_priv *bat_priv)
{
int ret;
ret = batadv_tt_local_init(bat_priv);
if (ret < 0)
return ret;
ret = batadv_tt_global_init(bat_priv);
if (ret < 0)
return ret;
INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
return 1;
}
static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
{
struct batadv_tt_roam_node *node, *safe;
@ -2297,6 +2264,9 @@ static void batadv_tt_purge(struct work_struct *work)
void batadv_tt_free(struct batadv_priv *bat_priv)
{
batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
cancel_delayed_work_sync(&bat_priv->tt.work);
batadv_tt_local_table_free(bat_priv);
@ -2384,14 +2354,20 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
}
}
static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len, int packet_min_len)
/**
* batadv_tt_local_commit_changes - commit all pending local tt changes which
* have been queued in the time since the last commit
* @bat_priv: the bat priv with all the soft interface information
*/
void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
{
uint16_t changed_num = 0;
if (atomic_read(&bat_priv->tt.local_changes) < 1)
return -ENOENT;
if (atomic_read(&bat_priv->tt.local_changes) < 1) {
if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
batadv_tt_tvlv_container_update(bat_priv);
return;
}
changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
BATADV_TT_CLIENT_NEW, false);
@ -2409,32 +2385,7 @@ static int batadv_tt_commit_changes(struct batadv_priv *bat_priv,
/* reset the sending counter */
atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
return batadv_tt_changes_fill_buff(bat_priv, packet_buff,
packet_buff_len, packet_min_len);
}
/* when calling this function (hard_iface == primary_if) has to be true */
int batadv_tt_append_diff(struct batadv_priv *bat_priv,
unsigned char **packet_buff, int *packet_buff_len,
int packet_min_len)
{
int tt_num_changes;
/* if at least one change happened */
tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff,
packet_buff_len,
packet_min_len);
/* if the changes have been sent often enough */
if ((tt_num_changes < 0) &&
(!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) {
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
packet_min_len, packet_min_len);
tt_num_changes = 0;
}
return tt_num_changes;
batadv_tt_tvlv_container_update(bat_priv);
}
bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
@ -2468,10 +2419,21 @@ bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
return ret;
}
void batadv_tt_update_orig(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_buff, uint8_t tt_num_changes,
uint8_t ttvn, uint16_t tt_crc)
/**
* batadv_tt_update_orig - update global translation table with new tt
* information received via ogms
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node of the ogm
* @tt_buff: buffer holding the tt information
* @tt_num_changes: number of tt changes inside the tt buffer
* @ttvn: translation table version number of this changeset
* @tt_crc: crc16 checksum of orig node's translation table
*/
static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_buff,
uint16_t tt_num_changes, uint8_t ttvn,
uint16_t tt_crc)
{
uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
bool full_table = true;
@ -2605,3 +2567,61 @@ bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
out:
return ret;
}
/**
* batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
* @bat_priv: the bat priv with all the soft interface information
* @orig: the orig_node of the ogm
* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
* @tvlv_value: tvlv buffer containing the gateway data
* @tvlv_value_len: tvlv buffer length
*/
static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig,
uint8_t flags,
void *tvlv_value,
uint16_t tvlv_value_len)
{
struct batadv_tvlv_tt_data *tt_data;
uint16_t num_entries;
if (tvlv_value_len < sizeof(*tt_data))
return;
tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
tvlv_value_len -= sizeof(*tt_data);
num_entries = tvlv_value_len / batadv_tt_len(1);
batadv_tt_update_orig(bat_priv, orig,
(unsigned char *)(tt_data + 1),
num_entries, tt_data->ttvn, ntohs(tt_data->crc));
}
/**
* batadv_tt_init - initialise the translation table internals
* @bat_priv: the bat priv with all the soft interface information
*
* Return 0 on success or negative error number in case of failure.
*/
int batadv_tt_init(struct batadv_priv *bat_priv)
{
int ret;
ret = batadv_tt_local_init(bat_priv);
if (ret < 0)
return ret;
ret = batadv_tt_global_init(bat_priv);
if (ret < 0)
return ret;
batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
NULL, BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
return 1;
}

8
net/batman-adv/translation-table.h
View File

@ -50,13 +50,7 @@ void batadv_handle_tt_response(struct batadv_priv *bat_priv,
struct batadv_tt_query_packet *tt_response);
bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
uint8_t *dst);
void batadv_tt_update_orig(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_buff, uint8_t tt_num_changes,
uint8_t ttvn, uint16_t tt_crc);
int batadv_tt_append_diff(struct batadv_priv *bat_priv,
unsigned char **packet_buff, int *packet_buff_len,
int packet_min_len);
void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv);
bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
uint8_t *addr);
bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,

2
net/batman-adv/types.h
View File

@ -772,7 +772,7 @@ struct batadv_tt_orig_list_entry {
*/
struct batadv_tt_change_node {
struct list_head list;
struct batadv_tt_change change;
struct batadv_tvlv_tt_change change;
};
/**