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IBSS RSN: Delay setting of the initial TX GTK

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The driver may get confused if we set the initial TX GTK before having
fully configured and connected to an IBSS, so better delay this
operation until the connection (join/start IBSS) has been completed.
This commit is contained in:
Jouni Malinen 2011-01-15 14:07:02 +02:00
parent 2e479416d1
commit 50b05780c2
3 changed files with 43 additions and 0 deletions
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8
wpa_supplicant/events.c
View file

@ -1310,6 +1310,14 @@ static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
/* Set static WEP keys again */
wpa_set_wep_keys(wpa_s, wpa_s->current_ssid);
}
#ifdef CONFIG_IBSS_RSN
if (wpa_s->current_ssid &&
wpa_s->current_ssid->mode == WPAS_MODE_IBSS &&
wpa_s->key_mgmt != WPA_KEY_MGMT_NONE &&
wpa_s->key_mgmt != WPA_KEY_MGMT_WPA_NONE)
ibss_rsn_connected(wpa_s->ibss_rsn);
#endif /* CONFIG_IBSS_RSN */
}

30
wpa_supplicant/ibss_rsn.c
View file

@ -277,6 +277,15 @@ static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
}
}
if (ibss_rsn->init_in_progress && key_len <=
sizeof(ibss_rsn->init_gtk)) {
wpa_printf(MSG_DEBUG, "AUTH: Delay setting of initial TX GTK "
"until RSN IBSS is connected");
ibss_rsn->init_gtk_idx = idx;
os_memcpy(ibss_rsn->init_gtk, key, key_len);
return 0;
}
return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
1, seq, 6, key, key_len);
}
@ -305,7 +314,9 @@ static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
cb.get_psk = auth_get_psk;
cb.set_key = auth_set_key;
ibss_rsn->init_in_progress = 1;
ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
ibss_rsn->init_in_progress = 0;
if (ibss_rsn->auth_group == NULL) {
wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
return -1;
@ -517,3 +528,22 @@ void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
{
os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
}
void ibss_rsn_connected(struct ibss_rsn *ibss_rsn)
{
u8 seq[6];
wpa_printf(MSG_DEBUG, "RSN: IBSS connected notification");
if (ibss_rsn->init_gtk_idx) {
wpa_printf(MSG_DEBUG, "RSN: Set initial IBSS TX GTK");
os_memset(seq, 0, sizeof(seq));
if (wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_CCMP,
broadcast_ether_addr,
ibss_rsn->init_gtk_idx,
1, seq, sizeof(seq), ibss_rsn->init_gtk,
16) < 0)
wpa_printf(MSG_INFO, "RSN: Failed to set IBSS TX GTK");
ibss_rsn->init_gtk_idx = 0;
os_memset(ibss_rsn->init_gtk, 0, sizeof(ibss_rsn->init_gtk));
}
}

5
wpa_supplicant/ibss_rsn.h
View file

@ -36,6 +36,10 @@ struct ibss_rsn {
struct wpa_authenticator *auth_group;
struct ibss_rsn_peer *peers;
u8 psk[PMK_LEN];
int init_in_progress;
int init_gtk_idx;
u8 init_gtk[16];
};
@ -45,5 +49,6 @@ int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr);
int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
const u8 *buf, size_t len);
void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk);
void ibss_rsn_connected(struct ibss_rsn *ibss_rsn);
#endif /* IBSS_RSN_H */