mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-28 18:28:23 -05:00
nl80211: Replace hostapd WEXT events with nl80211 events
This shares the nl80211 event processing with wpa_supplicant and removes the old WEXT code from driver_nl80211.c.
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
35583f3fa6
commit
5b7b85f669
@ -119,7 +119,6 @@ struct wpa_driver_nl80211_data {
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#ifdef HOSTAPD
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struct hostapd_data *hapd;
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int wext_sock; /* socket for wireless events */
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int eapol_sock; /* socket for EAPOL frames */
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int monitor_sock; /* socket for monitor */
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int monitor_ifidx;
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@ -128,7 +127,6 @@ struct wpa_driver_nl80211_data {
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int *if_indices;
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int num_if_indices;
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int we_version;
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int beacon_int;
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struct i802_bss bss;
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unsigned int ht_40mhz_scan:1;
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@ -154,10 +152,6 @@ static void nl80211_remove_iface(struct wpa_driver_nl80211_data *drv,
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#endif /* CONFIG_AP */
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#ifdef HOSTAPD
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#define wpa_supplicant_event(c, e, d) do { } while (0)
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#endif /* HOSTAPD */
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/* nl80211 code */
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static int ack_handler(struct nl_msg *msg, void *arg)
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{
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@ -181,6 +175,13 @@ static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
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return NL_SKIP;
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}
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static int no_seq_check(struct nl_msg *msg, void *arg)
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{
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return NL_OK;
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}
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static int send_and_recv_msgs(struct wpa_driver_nl80211_data *drv,
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struct nl_msg *msg,
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int (*valid_handler)(struct nl_msg *, void *),
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@ -382,6 +383,7 @@ static int wpa_driver_nl80211_get_ssid(void *priv, u8 *ssid)
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}
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#ifndef HOSTAPD
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static void wpa_driver_nl80211_event_link(struct wpa_driver_nl80211_data *drv,
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void *ctx, char *buf, size_t len,
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int del)
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@ -621,12 +623,6 @@ try_again:
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}
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static int no_seq_check(struct nl_msg *msg, void *arg)
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{
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return NL_OK;
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}
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static void mlme_event_auth(struct wpa_driver_nl80211_data *drv,
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const u8 *frame, size_t len)
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{
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@ -729,10 +725,17 @@ static void mlme_event(struct wpa_driver_nl80211_data *drv,
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}
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}
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#endif /* HOSTAPD */
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static void mlme_event_michael_mic_failure(struct wpa_driver_nl80211_data *drv,
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struct nlattr *tb[])
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{
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#ifdef HOSTAPD
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if (tb[NL80211_ATTR_MAC])
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hostapd_michael_mic_failure(drv->hapd,
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nla_data(tb[NL80211_ATTR_MAC]));
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#else /* HOSTAPD */
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union wpa_event_data data;
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wpa_printf(MSG_DEBUG, "nl80211: MLME event Michael MIC failure");
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@ -762,6 +765,7 @@ static void mlme_event_michael_mic_failure(struct wpa_driver_nl80211_data *drv,
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}
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wpa_supplicant_event(drv->ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
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#endif /* HOSTAPD */
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}
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@ -785,6 +789,7 @@ static int process_event(struct nl_msg *msg, void *arg)
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}
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switch (gnlh->cmd) {
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#ifndef HOSTAPD
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case NL80211_CMD_NEW_SCAN_RESULTS:
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wpa_printf(MSG_DEBUG, "nl80211: New scan results available");
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drv->scan_complete_events = 1;
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@ -808,6 +813,7 @@ static int process_event(struct nl_msg *msg, void *arg)
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case NL80211_CMD_DISASSOCIATE:
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mlme_event(drv, gnlh->cmd, tb[NL80211_ATTR_FRAME]);
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break;
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#endif /* HOSTAPD */
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case NL80211_CMD_MICHAEL_MIC_FAILURE:
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mlme_event_michael_mic_failure(drv, tb);
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break;
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@ -1116,8 +1122,10 @@ static void * wpa_driver_nl80211_init(void *ctx, const char *ifname)
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goto err6;
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}
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#ifndef HOSTAPD
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eloop_register_read_sock(s, wpa_driver_nl80211_event_receive_link, drv,
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ctx);
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#endif /* HOSTAPD */
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drv->link_event_sock = s;
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if (wpa_driver_nl80211_finish_drv_init(drv))
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@ -1234,7 +1242,9 @@ static void wpa_driver_nl80211_deinit(void *priv)
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static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
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{
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wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
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#ifndef HOSTAPD
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wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
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#endif /* HOSTAPD */
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}
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@ -4757,6 +4767,7 @@ static int i802_ht_scan(struct wpa_driver_nl80211_data *drv)
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static int i802_init_sockets(struct wpa_driver_nl80211_data *drv, const u8 *bssid)
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{
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struct ifreq ifr;
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int ret;
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drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
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if (drv->ioctl_sock < 0) {
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@ -4820,6 +4831,28 @@ static int i802_init_sockets(struct wpa_driver_nl80211_data *drv, const u8 *bssi
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return -1;
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}
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ret = nl_get_multicast_id(drv, "nl80211", "scan");
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if (ret >= 0)
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ret = nl_socket_add_membership(drv->nl_handle, ret);
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if (ret < 0) {
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wpa_printf(MSG_DEBUG, "nl80211: Could not add multicast "
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"membership for scan events: %d (%s)",
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ret, strerror(-ret));
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}
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ret = nl_get_multicast_id(drv, "nl80211", "mlme");
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if (ret >= 0)
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ret = nl_socket_add_membership(drv->nl_handle, ret);
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if (ret < 0) {
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wpa_printf(MSG_DEBUG, "nl80211: Could not add multicast "
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"membership for mlme events: %d (%s)",
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ret, strerror(-ret));
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}
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eloop_register_read_sock(nl_socket_get_fd(drv->nl_handle),
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wpa_driver_nl80211_event_receive, drv,
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drv->hapd);
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#ifdef CONFIG_IEEE80211N
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if (drv->ht_40mhz_scan) {
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if (nl80211_set_mode(drv, drv->ifname, NL80211_IFTYPE_STATION)
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@ -4899,255 +4932,6 @@ static int i802_sta_clear_stats(void *priv, const u8 *addr)
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}
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static void
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hostapd_wireless_event_wireless_custom(struct wpa_driver_nl80211_data *drv,
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char *custom)
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{
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wpa_printf(MSG_DEBUG, "Custom wireless event: '%s'", custom);
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if (strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
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char *pos;
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u8 addr[ETH_ALEN];
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pos = strstr(custom, "addr=");
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if (pos == NULL) {
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wpa_printf(MSG_DEBUG,
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"MLME-MICHAELMICFAILURE.indication "
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"without sender address ignored");
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return;
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}
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pos += 5;
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if (hwaddr_aton(pos, addr) == 0) {
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hostapd_michael_mic_failure(drv->hapd, addr);
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} else {
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wpa_printf(MSG_DEBUG,
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"MLME-MICHAELMICFAILURE.indication "
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"with invalid MAC address");
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}
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}
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}
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static void hostapd_wireless_event_wireless(struct wpa_driver_nl80211_data *drv,
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char *data, int len)
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{
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struct iw_event iwe_buf, *iwe = &iwe_buf;
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char *pos, *end, *custom, *buf;
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pos = data;
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end = data + len;
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while (pos + IW_EV_LCP_LEN <= end) {
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/* Event data may be unaligned, so make a local, aligned copy
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* before processing. */
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memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
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wpa_printf(MSG_DEBUG, "Wireless event: cmd=0x%x len=%d",
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iwe->cmd, iwe->len);
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if (iwe->len <= IW_EV_LCP_LEN)
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return;
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custom = pos + IW_EV_POINT_LEN;
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if (drv->we_version > 18 &&
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(iwe->cmd == IWEVMICHAELMICFAILURE ||
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iwe->cmd == IWEVCUSTOM)) {
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/* WE-19 removed the pointer from struct iw_point */
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char *dpos = (char *) &iwe_buf.u.data.length;
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int dlen = dpos - (char *) &iwe_buf;
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memcpy(dpos, pos + IW_EV_LCP_LEN,
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sizeof(struct iw_event) - dlen);
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} else {
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memcpy(&iwe_buf, pos, sizeof(struct iw_event));
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custom += IW_EV_POINT_OFF;
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}
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switch (iwe->cmd) {
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case IWEVCUSTOM:
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if (custom + iwe->u.data.length > end)
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return;
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buf = malloc(iwe->u.data.length + 1);
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if (buf == NULL)
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return;
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memcpy(buf, custom, iwe->u.data.length);
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buf[iwe->u.data.length] = '\0';
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hostapd_wireless_event_wireless_custom(drv, buf);
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free(buf);
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break;
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}
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pos += iwe->len;
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}
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}
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static void hostapd_wireless_event_rtm_newlink(struct wpa_driver_nl80211_data *drv,
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struct nlmsghdr *h, int len)
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{
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struct ifinfomsg *ifi;
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int attrlen, _nlmsg_len, rta_len;
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struct rtattr *attr;
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if (len < (int) sizeof(*ifi))
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return;
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ifi = NLMSG_DATA(h);
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/* TODO: use ifi->ifi_index to filter out wireless events from other
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* interfaces */
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_nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));
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attrlen = h->nlmsg_len - _nlmsg_len;
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if (attrlen < 0)
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return;
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attr = (struct rtattr *) (((char *) ifi) + _nlmsg_len);
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rta_len = RTA_ALIGN(sizeof(struct rtattr));
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while (RTA_OK(attr, attrlen)) {
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if (attr->rta_type == IFLA_WIRELESS) {
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hostapd_wireless_event_wireless(
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drv, ((char *) attr) + rta_len,
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attr->rta_len - rta_len);
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}
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attr = RTA_NEXT(attr, attrlen);
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}
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}
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static void hostapd_wireless_event_receive(int sock, void *eloop_ctx,
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void *sock_ctx)
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{
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char buf[256];
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int left;
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struct sockaddr_nl from;
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socklen_t fromlen;
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struct nlmsghdr *h;
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struct wpa_driver_nl80211_data *drv = eloop_ctx;
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fromlen = sizeof(from);
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left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
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(struct sockaddr *) &from, &fromlen);
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if (left < 0) {
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if (errno != EINTR && errno != EAGAIN)
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perror("recvfrom(netlink)");
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return;
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}
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h = (struct nlmsghdr *) buf;
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while (left >= (int) sizeof(*h)) {
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int len, plen;
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len = h->nlmsg_len;
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plen = len - sizeof(*h);
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if (len > left || plen < 0) {
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printf("Malformed netlink message: "
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"len=%d left=%d plen=%d\n",
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len, left, plen);
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break;
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}
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switch (h->nlmsg_type) {
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case RTM_NEWLINK:
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hostapd_wireless_event_rtm_newlink(drv, h, plen);
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break;
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}
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len = NLMSG_ALIGN(len);
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left -= len;
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h = (struct nlmsghdr *) ((char *) h + len);
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}
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if (left > 0) {
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printf("%d extra bytes in the end of netlink message\n", left);
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}
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}
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static int hostap_get_we_version(struct wpa_driver_nl80211_data *drv)
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{
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struct iw_range *range;
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struct iwreq iwr;
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int minlen;
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size_t buflen;
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drv->we_version = 0;
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/*
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* Use larger buffer than struct iw_range in order to allow the
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* structure to grow in the future.
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*/
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buflen = sizeof(struct iw_range) + 500;
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range = os_zalloc(buflen);
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if (range == NULL)
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return -1;
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memset(&iwr, 0, sizeof(iwr));
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os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
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iwr.u.data.pointer = (caddr_t) range;
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iwr.u.data.length = buflen;
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minlen = ((char *) &range->enc_capa) - (char *) range +
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sizeof(range->enc_capa);
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if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
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perror("ioctl[SIOCGIWRANGE]");
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free(range);
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return -1;
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} else if (iwr.u.data.length >= minlen &&
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range->we_version_compiled >= 18) {
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wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
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"WE(source)=%d enc_capa=0x%x",
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range->we_version_compiled,
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range->we_version_source,
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range->enc_capa);
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drv->we_version = range->we_version_compiled;
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}
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free(range);
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return 0;
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}
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static int i802_wireless_event_init(struct wpa_driver_nl80211_data *drv)
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{
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int s;
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struct sockaddr_nl local;
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hostap_get_we_version(drv);
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drv->wext_sock = -1;
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s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (s < 0) {
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perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
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return -1;
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}
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memset(&local, 0, sizeof(local));
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local.nl_family = AF_NETLINK;
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local.nl_groups = RTMGRP_LINK;
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if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
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perror("bind(netlink)");
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close(s);
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return -1;
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}
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eloop_register_read_sock(s, hostapd_wireless_event_receive, drv,
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NULL);
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drv->wext_sock = s;
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return 0;
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}
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static void i802_wireless_event_deinit(struct wpa_driver_nl80211_data *drv)
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{
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if (drv->wext_sock < 0)
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return;
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eloop_unregister_read_sock(drv->wext_sock);
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close(drv->wext_sock);
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}
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static int i802_sta_deauth(void *priv, const u8 *addr, int reason)
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{
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struct wpa_driver_nl80211_data *drv = priv;
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@ -5219,9 +5003,6 @@ static void *i802_init_bssid(struct hostapd_data *hapd, const u8 *bssid)
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if (i802_init_sockets(drv, bssid))
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goto failed;
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if (i802_wireless_event_init(drv))
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goto failed;
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return drv;
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failed:
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@ -5241,8 +5022,6 @@ static void i802_deinit(void *priv)
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struct wpa_driver_nl80211_data *drv = priv;
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struct i802_bss *bss, *prev;
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i802_wireless_event_deinit(drv);
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if (drv->last_freq_ht) {
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/* Clear HT flags from the driver */
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struct hostapd_freq_params freq;
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@ -5269,6 +5048,7 @@ static void i802_deinit(void *priv)
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close(drv->eapol_sock);
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}
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eloop_unregister_read_sock(nl_socket_get_fd(drv->nl_handle));
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genl_family_put(drv->nl80211);
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nl_cache_free(drv->nl_cache);
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nl_handle_destroy(drv->nl_handle);
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