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Replace sta_aid array with bitfield

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The actual pointer to struct sta_info was not really used and it is
enough to use a single bit to indicate whether an AID is allocated. This
makes the BSS data take less memory while making the allocation routine
faster and removing the arbitrary MAX_AID_TABLE_SIZE limit of 128 STAs.
This commit is contained in:
Jouni Malinen 2009-03-25 15:54:25 +02:00 committed by Jouni Malinen
parent d42a62b36c
commit 2991469cd1
4 changed files with 27 additions and 19 deletions
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8
hostapd/ap.h
View file

@ -113,14 +113,6 @@ struct sta_info {
};
/* Maximum number of AIDs to use for STAs; must be 2007 or lower
* (8802.11 limitation) */
#define MAX_AID_TABLE_SIZE 128
#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])
/* Default value for maximum station inactivity. After AP_MAX_INACTIVITY has
* passed since last received frame from the station, a nullfunc data frame is
* sent to the station. If this frame is not acknowledged and no other frames

12
hostapd/hostapd.h
View file

@ -44,13 +44,17 @@ struct hostapd_data {
int num_sta; /* number of entries in sta_list */
struct sta_info *sta_list; /* STA info list head */
#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])
struct sta_info *sta_hash[STA_HASH_SIZE];
/* pointers to STA info; based on allocated AID or NULL if AID free
* AID is in the range 1-2007, so sta_aid[0] corresponders to AID 1
* and so on
/*
* Bitfield for indicating which AIDs are allocated. Only AID values
* 1-2007 are used and as such, the bit at index 0 corresponds to AID
* 1.
*/
struct sta_info *sta_aid[MAX_AID_TABLE_SIZE];
#define AID_WORDS ((2008 + 31) / 32)
u32 sta_aid[AID_WORDS];
const struct wpa_driver_ops *driver;
void *drv_priv;

23
hostapd/ieee802_11.c
View file

@ -667,21 +667,32 @@ static void handle_auth(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
static int hostapd_get_aid(struct hostapd_data *hapd, struct sta_info *sta)
{
int i, j = 32, aid;
/* get a unique AID */
if (sta->aid > 0) {
wpa_printf(MSG_DEBUG, " old AID %d", sta->aid);
return 0;
}
for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
if (hapd->sta_aid[sta->aid - 1] == NULL)
for (i = 0; i < AID_WORDS; i++) {
if (hapd->sta_aid[i] == (u32) -1)
continue;
for (j = 0; j < 32; j++) {
if (!(hapd->sta_aid[i] & BIT(j)))
break;
}
if (j < 32)
break;
if (sta->aid > MAX_AID_TABLE_SIZE) {
sta->aid = 0;
return -1;
}
if (j == 32)
return -1;
aid = i * 32 + j + 1;
if (aid > 2007)
return -1;
hapd->sta_aid[sta->aid - 1] = sta;
sta->aid = aid;
hapd->sta_aid[i] |= BIT(j);
wpa_printf(MSG_DEBUG, " new AID %d", sta->aid);
return 0;
}

3
hostapd/sta_info.c
View file

@ -128,7 +128,8 @@ void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
ap_sta_list_del(hapd, sta);
if (sta->aid > 0)
hapd->sta_aid[sta->aid - 1] = NULL;
hapd->sta_aid[(sta->aid - 1) / 32] &=
~BIT((sta->aid - 1) % 32);
hapd->num_sta--;
if (sta->nonerp_set) {