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ap: remove ap_error_deauth_sta

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Instead of manually sending a deauth/disassociate to a station
during an error or removal, the kernel can do it automatically
with DEL_STATION by including the MGMT_SUBTYPE attribute. This
removes the need for ap_error_deauth_sta and introduces
ap_deauthenticate_sta. Now AP can be explicit when it chooses
to deauth or disassociate.
This commit is contained in:
James Prestwood 2018-06-28 09:12:22 -07:00 committed by Denis Kenzior
parent 48b7ed1e47
commit 93a113f551
1 changed files with 51 additions and 58 deletions
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109
src/ap.c
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@ -167,9 +167,6 @@ static void ap_new_rsna(struct sta_state *sta)
*/ */
} }
static void ap_error_deauth_sta(struct sta_state *sta,
enum mmpdu_reason_code reason);
static void ap_drop_rsna(struct sta_state *sta) static void ap_drop_rsna(struct sta_state *sta)
{ {
struct l_genl_msg *msg; struct l_genl_msg *msg;
@ -332,6 +329,52 @@ static uint32_t ap_send_mgmt_frame(struct ap_state *ap,
return id; return id;
} }
static struct l_genl_msg *ap_build_del_station(struct sta_state *sta,
enum mmpdu_reason_code reason, uint8_t subtype)
{
struct l_genl_msg *msg;
uint32_t ifindex = device_get_ifindex(sta->ap->device);
sta->associated = false;
sta->rsna = false;
msg = l_genl_msg_new_sized(NL80211_CMD_DEL_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_MGMT_SUBTYPE, 1, &subtype);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason);
return msg;
}
static void ap_deauthenticate_sta(struct sta_state *sta,
enum mmpdu_reason_code reason)
{
struct l_genl_msg *msg;
msg = ap_build_del_station(sta, reason,
MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION);
if (!l_genl_family_send(nl80211, msg, ap_del_sta_cb, NULL, NULL)) {
l_genl_msg_unref(msg);
l_error("Issuing DEL_STATION failed");
}
}
static void ap_disassociate_sta(struct sta_state *sta,
enum mmpdu_reason_code reason)
{
struct l_genl_msg *msg;
msg = ap_build_del_station(sta, reason,
MPDU_MANAGEMENT_SUBTYPE_DISASSOCIATION);
if (!l_genl_family_send(nl80211, msg, ap_del_sta_cb, NULL, NULL)) {
l_genl_msg_unref(msg);
l_error("Issuing DEL_STATION failed");
}
}
static void ap_handshake_event(struct handshake_state *hs, static void ap_handshake_event(struct handshake_state *hs,
enum handshake_event event, void *event_data, void *user_data) enum handshake_event event, void *event_data, void *user_data)
{ {
@ -342,62 +385,13 @@ static void ap_handshake_event(struct handshake_state *hs,
ap_new_rsna(sta); ap_new_rsna(sta);
break; break;
case HANDSHAKE_EVENT_FAILED: case HANDSHAKE_EVENT_FAILED:
ap_error_deauth_sta(sta, l_get_u16(event_data)); ap_deauthenticate_sta(sta, l_get_u16(event_data));
break; break;
default: default:
break; break;
} }
} }
static void ap_disassociate_sta(struct ap_state *ap, struct sta_state *sta)
{
struct l_genl_msg *msg;
uint32_t ifindex = device_get_ifindex(ap->device);
sta->associated = false;
sta->rsna = false;
msg = l_genl_msg_new_sized(NL80211_CMD_DEL_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_STA_AID, 2, &sta->aid);
if (!l_genl_family_send(nl80211, msg, ap_del_sta_cb, NULL, NULL)) {
l_genl_msg_unref(msg);
l_error("Issuing DEL_STATION failed");
}
}
static void ap_error_deauth_sta(struct sta_state *sta,
enum mmpdu_reason_code reason)
{
struct ap_state *ap = sta->ap;
const uint8_t *bssid = device_get_address(ap->device);
uint8_t mpdu_buf[128];
struct mmpdu_header *mpdu = (void *) mpdu_buf;
struct mmpdu_deauthentication *deauth;
memset(mpdu, 0, sizeof(*mpdu));
mpdu->fc.protocol_version = 0;
mpdu->fc.type = MPDU_TYPE_MANAGEMENT;
mpdu->fc.subtype = MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION;
memcpy(mpdu->address_1, sta->addr, 6); /* DA */
memcpy(mpdu->address_2, bssid, 6); /* SA */
memcpy(mpdu->address_3, bssid, 6); /* BSSID */
deauth = (void *) mmpdu_body(mpdu);
deauth->reason_code = L_CPU_TO_LE16(reason);
ap_send_mgmt_frame(ap, mpdu, deauth->ies - mpdu_buf, false, NULL, NULL);
if (sta->associated)
ap_disassociate_sta(ap, sta);
l_queue_remove(ap->sta_states, sta);
ap_sta_free(sta);
}
static void ap_associate_sta_cb(struct l_genl_msg *msg, void *user_data) static void ap_associate_sta_cb(struct l_genl_msg *msg, void *user_data)
{ {
struct sta_state *sta = user_data; struct sta_state *sta = user_data;
@ -458,7 +452,7 @@ static void ap_associate_sta_cb(struct l_genl_msg *msg, void *user_data)
return; return;
error: error:
ap_disassociate_sta(sta->ap, sta); ap_disassociate_sta(sta, MMPDU_REASON_CODE_UNSPECIFIED);
} }
static void ap_associate_sta(struct ap_state *ap, struct sta_state *sta) static void ap_associate_sta(struct ap_state *ap, struct sta_state *sta)
@ -541,7 +535,7 @@ static void ap_success_assoc_resp_cb(struct l_genl_msg *msg, void *user_data)
/* If we were in State 3 or 4 go to back to State 2 */ /* If we were in State 3 or 4 go to back to State 2 */
if (sta->associated) if (sta->associated)
ap_disassociate_sta(ap, sta); ap_disassociate_sta(sta, MMPDU_REASON_CODE_UNSPECIFIED);
return; return;
} }
@ -1003,7 +997,7 @@ static void ap_disassoc_cb(struct netdev *netdev,
if (!sta || !sta->associated) if (!sta || !sta->associated)
return; return;
ap_disassociate_sta(ap, sta); ap_disassociate_sta(sta, L_LE16_TO_CPU(disassoc->reason_code));
} }
static void ap_auth_reply_cb(struct l_genl_msg *msg, void *user_data) static void ap_auth_reply_cb(struct l_genl_msg *msg, void *user_data)
@ -1137,8 +1131,7 @@ static void ap_deauth_cb(struct netdev *netdev, const struct mmpdu_header *hdr,
if (!sta) if (!sta)
return; return;
if (sta->associated) ap_deauthenticate_sta(sta, L_LE16_TO_CPU(deauth->reason_code));
ap_disassociate_sta(ap, sta);
ap_sta_free(sta); ap_sta_free(sta);
} }