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nl80211: Add channel switch implementation

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Implement nl80211 switch_channel() operation.
Publish flags indicating kernel support for channel switch.

Signed-hostap: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Andrei Otcheretianski 2013-11-14 12:28:30 +02:00 committed by Jouni Malinen
parent dcca2219ae
commit 1c4ffa8746
1 changed files with 161 additions and 18 deletions
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179
src/drivers/driver_nl80211.c
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@ -300,6 +300,7 @@ struct wpa_driver_nl80211_data {
unsigned int hostapd:1;
unsigned int start_mode_ap:1;
unsigned int start_iface_up:1;
unsigned int channel_switch_supported:1;
u64 remain_on_chan_cookie;
u64 send_action_cookie;
@ -1502,6 +1503,8 @@ static void mlme_event_ch_switch(struct wpa_driver_nl80211_data *drv,
data.ch_switch.ht_enabled = ht_enabled;
data.ch_switch.ch_offset = chan_offset;
drv->first_bss->freq = data.ch_switch.freq;
wpa_supplicant_event(drv->ctx, EVENT_CH_SWITCH, &data);
}
@ -3043,6 +3046,7 @@ struct wiphy_info_data {
unsigned int p2p_go_supported:1;
unsigned int p2p_client_supported:1;
unsigned int p2p_concurrent:1;
unsigned int channel_switch_supported:1;
};
@ -3200,6 +3204,9 @@ static void wiphy_info_supp_cmds(struct wiphy_info_data *info,
case NL80211_CMD_PROBE_CLIENT:
info->poll_command_supported = 1;
break;
case NL80211_CMD_CHANNEL_SWITCH:
info->channel_switch_supported = 1;
break;
}
}
}
@ -3461,6 +3468,7 @@ static int wpa_driver_nl80211_capa(struct wpa_driver_nl80211_data *drv)
drv->device_ap_sme = info.device_ap_sme;
drv->poll_command_supported = info.poll_command_supported;
drv->data_tx_status = info.data_tx_status;
drv->channel_switch_supported = info.channel_switch_supported;
/*
* If poll command and tx status are supported, mac80211 is new enough
@ -6763,24 +6771,9 @@ static int wpa_driver_nl80211_set_ap(void *priv,
}
static int wpa_driver_nl80211_set_freq(struct i802_bss *bss,
struct hostapd_freq_params *freq)
static int nl80211_put_freq_params(struct nl_msg *msg,
struct hostapd_freq_params *freq)
{
struct wpa_driver_nl80211_data *drv = bss->drv;
struct nl_msg *msg;
int ret;
wpa_printf(MSG_DEBUG, "nl80211: Set freq %d (ht_enabled=%d, vht_enabled=%d,"
" bandwidth=%d MHz, cf1=%d MHz, cf2=%d MHz)",
freq->freq, freq->ht_enabled, freq->vht_enabled,
freq->bandwidth, freq->center_freq1, freq->center_freq2);
msg = nlmsg_alloc();
if (!msg)
return -1;
nl80211_cmd(drv, msg, 0, NL80211_CMD_SET_WIPHY);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq->freq);
if (freq->vht_enabled) {
switch (freq->bandwidth) {
@ -6805,7 +6798,7 @@ static int wpa_driver_nl80211_set_freq(struct i802_bss *bss,
NL80211_CHAN_WIDTH_160);
break;
default:
return -1;
return -EINVAL;
}
NLA_PUT_U32(msg, NL80211_ATTR_CENTER_FREQ1, freq->center_freq1);
if (freq->center_freq2)
@ -6827,6 +6820,33 @@ static int wpa_driver_nl80211_set_freq(struct i802_bss *bss,
break;
}
}
return 0;
nla_put_failure:
return -ENOBUFS;
}
static int wpa_driver_nl80211_set_freq(struct i802_bss *bss,
struct hostapd_freq_params *freq)
{
struct wpa_driver_nl80211_data *drv = bss->drv;
struct nl_msg *msg;
int ret;
wpa_printf(MSG_DEBUG,
"nl80211: Set freq %d (ht_enabled=%d, vht_enabled=%d, bandwidth=%d MHz, cf1=%d MHz, cf2=%d MHz)",
freq->freq, freq->ht_enabled, freq->vht_enabled,
freq->bandwidth, freq->center_freq1, freq->center_freq2);
msg = nlmsg_alloc();
if (!msg)
return -1;
nl80211_cmd(drv, msg, 0, NL80211_CMD_SET_WIPHY);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
if (nl80211_put_freq_params(msg, freq) < 0)
goto nla_put_failure;
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
msg = NULL;
@ -11211,6 +11231,128 @@ static int wpa_driver_nl80211_status(void *priv, char *buf, size_t buflen)
}
static int set_beacon_data(struct nl_msg *msg, struct beacon_data *settings)
{
if (settings->head)
NLA_PUT(msg, NL80211_ATTR_BEACON_HEAD,
settings->head_len, settings->head);
if (settings->tail)
NLA_PUT(msg, NL80211_ATTR_BEACON_TAIL,
settings->tail_len, settings->tail);
if (settings->beacon_ies)
NLA_PUT(msg, NL80211_ATTR_IE,
settings->beacon_ies_len, settings->beacon_ies);
if (settings->proberesp_ies)
NLA_PUT(msg, NL80211_ATTR_IE_PROBE_RESP,
settings->proberesp_ies_len, settings->proberesp_ies);
if (settings->assocresp_ies)
NLA_PUT(msg,
NL80211_ATTR_IE_ASSOC_RESP,
settings->assocresp_ies_len, settings->assocresp_ies);
if (settings->probe_resp)
NLA_PUT(msg, NL80211_ATTR_PROBE_RESP,
settings->probe_resp_len, settings->probe_resp);
return 0;
nla_put_failure:
return -ENOBUFS;
}
static int nl80211_switch_channel(void *priv, struct csa_settings *settings)
{
struct nl_msg *msg;
struct i802_bss *bss = priv;
struct wpa_driver_nl80211_data *drv = bss->drv;
struct nlattr *beacon_csa;
int ret = -ENOBUFS;
wpa_printf(MSG_DEBUG, "nl80211: Channel switch request (cs_count=%u block_tx=%u freq=%d)",
settings->cs_count, settings->block_tx,
settings->freq_params.freq);
if (!drv->channel_switch_supported) {
wpa_printf(MSG_DEBUG, "nl80211: Driver does not support channel switch command");
return -EOPNOTSUPP;
}
if ((drv->nlmode != NL80211_IFTYPE_AP) &&
(drv->nlmode != NL80211_IFTYPE_P2P_GO))
return -EOPNOTSUPP;
/* check settings validity */
if (!settings->beacon_csa.tail ||
((settings->beacon_csa.tail_len <=
settings->counter_offset_beacon) ||
(settings->beacon_csa.tail[settings->counter_offset_beacon] !=
settings->cs_count)))
return -EINVAL;
if (settings->beacon_csa.probe_resp &&
((settings->beacon_csa.probe_resp_len <=
settings->counter_offset_presp) ||
(settings->beacon_csa.probe_resp[settings->counter_offset_presp] !=
settings->cs_count)))
return -EINVAL;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
nl80211_cmd(drv, msg, 0, NL80211_CMD_CHANNEL_SWITCH);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_CH_SWITCH_COUNT, settings->cs_count);
ret = nl80211_put_freq_params(msg, &settings->freq_params);
if (ret)
goto error;
if (settings->block_tx)
NLA_PUT_FLAG(msg, NL80211_ATTR_CH_SWITCH_BLOCK_TX);
/* beacon_after params */
ret = set_beacon_data(msg, &settings->beacon_after);
if (ret)
goto error;
/* beacon_csa params */
beacon_csa = nla_nest_start(msg, NL80211_ATTR_CSA_IES);
if (!beacon_csa)
goto nla_put_failure;
ret = set_beacon_data(msg, &settings->beacon_csa);
if (ret)
goto error;
NLA_PUT_U16(msg, NL80211_ATTR_CSA_C_OFF_BEACON,
settings->counter_offset_beacon);
if (settings->beacon_csa.probe_resp)
NLA_PUT_U16(msg, NL80211_ATTR_CSA_C_OFF_PRESP,
settings->counter_offset_presp);
nla_nest_end(msg, beacon_csa);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
if (ret) {
wpa_printf(MSG_DEBUG, "nl80211: switch_channel failed err=%d (%s)",
ret, strerror(-ret));
}
return ret;
nla_put_failure:
ret = -ENOBUFS;
error:
nlmsg_free(msg);
wpa_printf(MSG_DEBUG, "nl80211: Could not build channel switch request");
return ret;
}
const struct wpa_driver_ops wpa_driver_nl80211_ops = {
.name = "nl80211",
.desc = "Linux nl80211/cfg80211",
@ -11290,4 +11432,5 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
.get_mac_addr = wpa_driver_nl80211_get_macaddr,
.get_survey = wpa_driver_nl80211_get_survey,
.status = wpa_driver_nl80211_status,
.switch_channel = nl80211_switch_channel,
};