static void pmksa_cache_link_entry(struct rsn_pmksa_cache *pmksa,
struct rsn_pmksa_cache_entry *entry)
{
struct rsn_pmksa_cache_entry *pos, *prev;
/* Add the new entry; order by expiration time */
pos = pmksa->pmksa;
prev = NULL;
while (pos) {
if (pos->expiration > entry->expiration)
break;
prev = pos;
pos = pos->next;
}
if (prev == NULL) {
entry->next = pmksa->pmksa;
pmksa->pmksa = entry;
} else {
entry->next = prev->next;
prev->next = entry;
}
entry->hnext = pmksa->pmkid[PMKID_HASH(entry->pmkid)];
pmksa->pmkid[PMKID_HASH(entry->pmkid)] = entry;
pmksa->pmksa_count++;
if (prev == NULL)
pmksa_cache_set_expiration(pmksa);
wpa_printf(MSG_DEBUG, "RSN: added PMKSA cache entry for " MACSTR,
MAC2STR(entry->spa));
wpa_hexdump(MSG_DEBUG, "RSN: added PMKID", entry->pmkid, PMKID_LEN);
}
void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
struct rsn_pmksa_cache_entry *entry)
{
struct rsn_pmksa_cache_entry *pos, *prev;
pmksa->pmksa_count--;
pmksa->free_cb(entry, pmksa->ctx);
pos = pmksa->pmkid[PMKID_HASH(entry->pmkid)];
prev = NULL;
while (pos) {
if (pos == entry) {
if (prev != NULL) {
prev->hnext = pos->hnext;
} else {
pmksa->pmkid[PMKID_HASH(entry->pmkid)] =
pos->hnext;
}
break;
}
prev = pos;
pos = pos->hnext;
}
pos = pmksa->pmksa;
prev = NULL;
while (pos) {
if (pos == entry) {
if (prev != NULL)
prev->next = pos->next;
else
pmksa->pmksa = pos->next;
break;
}
prev = pos;
pos = pos->next;
}
_pmksa_cache_free_entry(entry);
}
/**
* pmksa_cache_get - Fetch a PMKSA cache entry
* @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
* @spa: Supplicant address or %NULL to match any
* @pmkid: PMKID or %NULL to match any
* Returns: Pointer to PMKSA cache entry or %NULL if no match was found
*/
struct rsn_pmksa_cache_entry * pmksa_cache_get(struct rsn_pmksa_cache *pmksa,
const u8 *spa, const u8 *pmkid)
{
struct rsn_pmksa_cache_entry *entry;
if (pmkid)
entry = pmksa->pmkid[PMKID_HASH(pmkid)];
else
entry = pmksa->pmksa;
while (entry) {
if ((spa == NULL || memcmp(entry->spa, spa, ETH_ALEN) == 0) &&
(pmkid == NULL ||
memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0))
return entry;
entry = pmkid ? entry->hnext : entry->next;
}
return NULL;
}
void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
struct rsn_pmksa_cache_entry *entry)
{
struct rsn_pmksa_cache_entry *pos, *prev;
unsigned int hash;
pmksa->pmksa_count--;
pmksa->free_cb(entry, pmksa->ctx);
/* unlink from hash list */
hash = PMKID_HASH(entry->pmkid);
pos = pmksa->pmkid[hash];
prev = NULL;
while (pos) {
if (pos == entry) {
if (prev != NULL)
prev->hnext = entry->hnext;
else
pmksa->pmkid[hash] = entry->hnext;
break;
}
prev = pos;
pos = pos->hnext;
}
/* unlink from entry list */
pos = pmksa->pmksa;
prev = NULL;
while (pos) {
if (pos == entry) {
if (prev != NULL)
prev->next = entry->next;
else
pmksa->pmksa = entry->next;
break;
}
prev = pos;
pos = pos->next;
}
_pmksa_cache_free_entry(entry);
}
/**
* pmksa_cache_auth_get - Fetch a PMKSA cache entry
* @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
* @spa: Supplicant address or %NULL to match any
* @pmkid: PMKID or %NULL to match any
* Returns: Pointer to PMKSA cache entry or %NULL if no match was found
*/
struct rsn_pmksa_cache_entry *
pmksa_cache_auth_get(struct rsn_pmksa_cache *pmksa,
const u8 *spa, const u8 *pmkid)
{
struct rsn_pmksa_cache_entry *entry;
if (pmkid) {
for (entry = pmksa->pmkid[PMKID_HASH(pmkid)]; entry;
entry = entry->hnext) {
if ((spa == NULL ||
os_memcmp(entry->spa, spa, ETH_ALEN) == 0) &&
os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0)
return entry;
}
} else {
for (entry = pmksa->pmksa; entry; entry = entry->next) {
if (spa == NULL ||
os_memcmp(entry->spa, spa, ETH_ALEN) == 0)
return entry;
}
}
return NULL;
}
/**
* pmksa_cache_add - Add a PMKSA cache entry
* @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
* @pmk: The new pairwise master key
* @pmk_len: PMK length in bytes, usually PMK_LEN (32)
* @aa: Authenticator address
* @spa: Supplicant address
* @session_timeout: Session timeout
* @eapol: Pointer to EAPOL state machine data
* Returns: Pointer to the added PMKSA cache entry or %NULL on error
*
* This function create a PMKSA entry for a new PMK and adds it to the PMKSA
* cache. If an old entry is already in the cache for the same Supplicant,
* this entry will be replaced with the new entry. PMKID will be calculated
* based on the PMK.
*/
struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
const u8 *aa, const u8 *spa, int session_timeout,
struct eapol_state_machine *eapol)
{
struct rsn_pmksa_cache_entry *entry, *pos, *prev;
struct os_time now;
if (pmk_len > PMK_LEN)
return NULL;
entry = wpa_zalloc(sizeof(*entry));
if (entry == NULL)
return NULL;
memcpy(entry->pmk, pmk, pmk_len);
entry->pmk_len = pmk_len;
rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid);
os_get_time(&now);
entry->expiration = now.sec;
if (session_timeout > 0)
entry->expiration += session_timeout;
else
entry->expiration += dot11RSNAConfigPMKLifetime;
entry->akmp = WPA_KEY_MGMT_IEEE8021X;
memcpy(entry->spa, spa, ETH_ALEN);
pmksa_cache_from_eapol_data(entry, eapol);
/* Replace an old entry for the same STA (if found) with the new entry
*/
pos = pmksa_cache_get(pmksa, spa, NULL);
if (pos)
pmksa_cache_free_entry(pmksa, pos);
if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
/* Remove the oldest entry to make room for the new entry */
wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache "
"entry (for " MACSTR ") to make room for new one",
MAC2STR(pmksa->pmksa->spa));
pmksa_cache_free_entry(pmksa, pmksa->pmksa);
}
/* Add the new entry; order by expiration time */
pos = pmksa->pmksa;
prev = NULL;
while (pos) {
if (pos->expiration > entry->expiration)
break;
prev = pos;
pos = pos->next;
}
if (prev == NULL) {
entry->next = pmksa->pmksa;
pmksa->pmksa = entry;
} else {
entry->next = prev->next;
prev->next = entry;
}
entry->hnext = pmksa->pmkid[PMKID_HASH(entry->pmkid)];
pmksa->pmkid[PMKID_HASH(entry->pmkid)] = entry;
pmksa->pmksa_count++;
wpa_printf(MSG_DEBUG, "RSN: added PMKSA cache entry for " MACSTR,
MAC2STR(entry->spa));
wpa_hexdump(MSG_DEBUG, "RSN: added PMKID", entry->pmkid, PMKID_LEN);
pmksa_cache_set_expiration(pmksa) ;
return entry;
}
