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cfg80211: support FTM responder configuration/statistics

Browse Source 
Allow userspace to enable fine timing measurement responder
functionality with configurable lci/civic parameters in AP mode.
This can be done at AP start or changing beacon parameters.

A new EXT_FEATURE flag is introduced for drivers to advertise
the capability.

Also nl80211 API support for retrieving statistics is added.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
[remove unused cfg80211_ftm_responder_params, clarify docs,
 move validation into policy]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Pradeep Kumar Chitrapu 2018-09-20 17:30:09 -07:00 committed by Johannes Berg
parent 7057f2496c
commit 81e54d08d9
5 changed files with 328 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
include/net/cfg80211.h
View File

@ -775,6 +775,12 @@ struct cfg80211_crypto_settings {
* @assocresp_ies_len: length of assocresp_ies in octets
* @probe_resp_len: length of probe response template (@probe_resp)
* @probe_resp: probe response template (AP mode only)
* @ftm_responder: enable FTM responder functionality; -1 for no change
* (which also implies no change in LCI/civic location data)
* @lci: LCI subelement content
* @civicloc: Civic location subelement content
* @lci_len: LCI data length
* @civicloc_len: Civic location data length
*/
struct cfg80211_beacon_data {
const u8 *head, *tail;
@ -782,12 +788,17 @@ struct cfg80211_beacon_data {
const u8 *proberesp_ies;
const u8 *assocresp_ies;
const u8 *probe_resp;
const u8 *lci;
const u8 *civicloc;
s8 ftm_responder;
size_t head_len, tail_len;
size_t beacon_ies_len;
size_t proberesp_ies_len;
size_t assocresp_ies_len;
size_t probe_resp_len;
size_t lci_len;
size_t civicloc_len;
};
struct mac_address {
@ -2796,6 +2807,40 @@ struct cfg80211_external_auth_params {
u16 status;
};
/**
* cfg80211_ftm_responder_stats - FTM responder statistics
*
* @filled: bitflag of flags using the bits of &enum nl80211_ftm_stats to
* indicate the relevant values in this struct for them
* @success_num: number of FTM sessions in which all frames were successfully
* answered
* @partial_num: number of FTM sessions in which part of frames were
* successfully answered
* @failed_num: number of failed FTM sessions
* @asap_num: number of ASAP FTM sessions
* @non_asap_num: number of non-ASAP FTM sessions
* @total_duration_ms: total sessions durations - gives an indication
* of how much time the responder was busy
* @unknown_triggers_num: number of unknown FTM triggers - triggers from
* initiators that didn't finish successfully the negotiation phase with
* the responder
* @reschedule_requests_num: number of FTM reschedule requests - initiator asks
* for a new scheduling although it already has scheduled FTM slot
* @out_of_window_triggers_num: total FTM triggers out of scheduled window
*/
struct cfg80211_ftm_responder_stats {
u32 filled;
u32 success_num;
u32 partial_num;
u32 failed_num;
u32 asap_num;
u32 non_asap_num;
u64 total_duration_ms;
u32 unknown_triggers_num;
u32 reschedule_requests_num;
u32 out_of_window_triggers_num;
};
/**
* struct cfg80211_ops - backend description for wireless configuration
*
@ -3128,6 +3173,9 @@ struct cfg80211_external_auth_params {
*
* @tx_control_port: TX a control port frame (EAPoL). The noencrypt parameter
* tells the driver that the frame should not be encrypted.
*
* @get_ftm_responder_stats: Retrieve FTM responder statistics, if available.
* Statistics should be cumulative, currently no way to reset is provided.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@ -3433,6 +3481,10 @@ struct cfg80211_ops {
const u8 *buf, size_t len,
const u8 *dest, const __be16 proto,
const bool noencrypt);
int (*get_ftm_responder_stats)(struct wiphy *wiphy,
struct net_device *dev,
struct cfg80211_ftm_responder_stats *ftm_stats);
};
/*

90
include/uapi/linux/nl80211.h
View File

@ -1033,6 +1033,9 @@
* %NL80211_ATTR_CHANNEL_WIDTH,%NL80211_ATTR_NSS attributes with its
* address(specified in %NL80211_ATTR_MAC).
*
* @NL80211_CMD_GET_FTM_RESPONDER_STATS: Retrieve FTM responder statistics, in
* the %NL80211_ATTR_FTM_RESPONDER_STATS attribute.
*
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@ -1245,6 +1248,8 @@ enum nl80211_commands {
NL80211_CMD_CONTROL_PORT_FRAME,
NL80211_CMD_GET_FTM_RESPONDER_STATS,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@ -2241,6 +2246,14 @@ enum nl80211_commands {
* association request when used with NL80211_CMD_NEW_STATION). Can be set
* only if %NL80211_STA_FLAG_WME is set.
*
* @NL80211_ATTR_FTM_RESPONDER: nested attribute which user-space can include
* in %NL80211_CMD_START_AP or %NL80211_CMD_SET_BEACON for fine timing
* measurement (FTM) responder functionality and containing parameters as
* possible, see &enum nl80211_ftm_responder_attr
*
* @NL80211_ATTR_FTM_RESPONDER_STATS: Nested attribute with FTM responder
* statistics, see &enum nl80211_ftm_responder_stats.
*
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@ -2682,6 +2695,10 @@ enum nl80211_attrs {
NL80211_ATTR_HE_CAPABILITY,
NL80211_ATTR_FTM_RESPONDER,
NL80211_ATTR_FTM_RESPONDER_STATS,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -5225,6 +5242,8 @@ enum nl80211_feature_flags {
* @NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT: Driver/device can omit all data
* except for supported rates from the probe request content if requested
* by the %NL80211_SCAN_FLAG_MIN_PREQ_CONTENT flag.
* @NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER: Driver supports enabling fine
* timing measurement responder role.
*
* @NL80211_EXT_FEATURE_CAN_REPLACE_PTK0: Driver/device confirm that they are
* able to rekey an in-use key correctly. Userspace must not rekey PTK keys
@ -5269,6 +5288,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_SCAN_RANDOM_SN,
NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
NL80211_EXT_FEATURE_CAN_REPLACE_PTK0,
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
@ -5808,4 +5828,74 @@ enum nl80211_external_auth_action {
NL80211_EXTERNAL_AUTH_ABORT,
};
/**
* enum nl80211_ftm_responder_attributes - fine timing measurement
* responder attributes
* @__NL80211_FTM_RESP_ATTR_INVALID: Invalid
* @NL80211_FTM_RESP_ATTR_ENABLED: FTM responder is enabled
* @NL80211_FTM_RESP_ATTR_LCI: The content of Measurement Report Element
* (9.4.2.22 in 802.11-2016) with type 8 - LCI (9.4.2.22.10)
* @NL80211_FTM_RESP_ATTR_CIVIC: The content of Measurement Report Element
* (9.4.2.22 in 802.11-2016) with type 11 - Civic (Section 9.4.2.22.13)
* @__NL80211_FTM_RESP_ATTR_LAST: Internal
* @NL80211_FTM_RESP_ATTR_MAX: highest FTM responder attribute.
*/
enum nl80211_ftm_responder_attributes {
__NL80211_FTM_RESP_ATTR_INVALID,
NL80211_FTM_RESP_ATTR_ENABLED,
NL80211_FTM_RESP_ATTR_LCI,
NL80211_FTM_RESP_ATTR_CIVICLOC,
/* keep last */
__NL80211_FTM_RESP_ATTR_LAST,
NL80211_FTM_RESP_ATTR_MAX = __NL80211_FTM_RESP_ATTR_LAST - 1,
};
/*
* enum nl80211_ftm_responder_stats - FTM responder statistics
*
* These attribute types are used with %NL80211_ATTR_FTM_RESPONDER_STATS
* when getting FTM responder statistics.
*
* @__NL80211_FTM_STATS_INVALID: attribute number 0 is reserved
* @NL80211_FTM_STATS_SUCCESS_NUM: number of FTM sessions in which all frames
* were ssfully answered (u32)
* @NL80211_FTM_STATS_PARTIAL_NUM: number of FTM sessions in which part of the
* frames were successfully answered (u32)
* @NL80211_FTM_STATS_FAILED_NUM: number of failed FTM sessions (u32)
* @NL80211_FTM_STATS_ASAP_NUM: number of ASAP sessions (u32)
* @NL80211_FTM_STATS_NON_ASAP_NUM: number of non-ASAP sessions (u32)
* @NL80211_FTM_STATS_TOTAL_DURATION_MSEC: total sessions durations - gives an
* indication of how much time the responder was busy (u64, msec)
* @NL80211_FTM_STATS_UNKNOWN_TRIGGERS_NUM: number of unknown FTM triggers -
* triggers from initiators that didn't finish successfully the negotiation
* phase with the responder (u32)
* @NL80211_FTM_STATS_RESCHEDULE_REQUESTS_NUM: number of FTM reschedule requests
* - initiator asks for a new scheduling although it already has scheduled
* FTM slot (u32)
* @NL80211_FTM_STATS_OUT_OF_WINDOW_TRIGGERS_NUM: number of FTM triggers out of
* scheduled window (u32)
* @NL80211_FTM_STATS_PAD: used for padding, ignore
* @__NL80211_TXQ_ATTR_AFTER_LAST: Internal
* @NL80211_FTM_STATS_MAX: highest possible FTM responder stats attribute
*/
enum nl80211_ftm_responder_stats {
__NL80211_FTM_STATS_INVALID,
NL80211_FTM_STATS_SUCCESS_NUM,
NL80211_FTM_STATS_PARTIAL_NUM,
NL80211_FTM_STATS_FAILED_NUM,
NL80211_FTM_STATS_ASAP_NUM,
NL80211_FTM_STATS_NON_ASAP_NUM,
NL80211_FTM_STATS_TOTAL_DURATION_MSEC,
NL80211_FTM_STATS_UNKNOWN_TRIGGERS_NUM,
NL80211_FTM_STATS_RESCHEDULE_REQUESTS_NUM,
NL80211_FTM_STATS_OUT_OF_WINDOW_TRIGGERS_NUM,
NL80211_FTM_STATS_PAD,
/* keep last */
__NL80211_FTM_STATS_AFTER_LAST,
NL80211_FTM_STATS_MAX = __NL80211_FTM_STATS_AFTER_LAST - 1
};
#endif /* __LINUX_NL80211_H */

132
net/wireless/nl80211.c
View File

@ -201,6 +201,15 @@ cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
}
/* policy for the attributes */
static const struct nla_policy
nl80211_ftm_responder_policy[NL80211_FTM_RESP_ATTR_MAX + 1] = {
[NL80211_FTM_RESP_ATTR_ENABLED] = { .type = NLA_FLAG, },
[NL80211_FTM_RESP_ATTR_LCI] = { .type = NLA_BINARY,
.len = U8_MAX },
[NL80211_FTM_RESP_ATTR_CIVICLOC] = { .type = NLA_BINARY,
.len = U8_MAX },
};
static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
@ -430,6 +439,11 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_TXQ_QUANTUM] = { .type = NLA_U32 },
[NL80211_ATTR_HE_CAPABILITY] = { .type = NLA_BINARY,
.len = NL80211_HE_MAX_CAPABILITY_LEN },
[NL80211_ATTR_FTM_RESPONDER] = {
.type = NLA_NESTED,
.validation_data = nl80211_ftm_responder_policy,
},
};
/* policy for the key attributes */
@ -3989,10 +4003,12 @@ static int validate_beacon_tx_rate(struct cfg80211_registered_device *rdev,
return 0;
}
static int nl80211_parse_beacon(struct nlattr *attrs[],
static int nl80211_parse_beacon(struct cfg80211_registered_device *rdev,
struct nlattr *attrs[],
struct cfg80211_beacon_data *bcn)
{
bool haveinfo = false;
int err;
if (!is_valid_ie_attr(attrs[NL80211_ATTR_BEACON_TAIL]) ||
!is_valid_ie_attr(attrs[NL80211_ATTR_IE]) ||
@ -4043,6 +4059,35 @@ static int nl80211_parse_beacon(struct nlattr *attrs[],
bcn->probe_resp_len = nla_len(attrs[NL80211_ATTR_PROBE_RESP]);
}
if (attrs[NL80211_ATTR_FTM_RESPONDER]) {
struct nlattr *tb[NL80211_FTM_RESP_ATTR_MAX + 1];
err = nla_parse_nested(tb, NL80211_FTM_RESP_ATTR_MAX,
attrs[NL80211_ATTR_FTM_RESPONDER],
NULL, NULL);
if (err)
return err;
if (tb[NL80211_FTM_RESP_ATTR_ENABLED] &&
wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER))
bcn->ftm_responder = 1;
else
return -EOPNOTSUPP;
if (tb[NL80211_FTM_RESP_ATTR_LCI]) {
bcn->lci = nla_data(tb[NL80211_FTM_RESP_ATTR_LCI]);
bcn->lci_len = nla_len(tb[NL80211_FTM_RESP_ATTR_LCI]);
}
if (tb[NL80211_FTM_RESP_ATTR_CIVICLOC]) {
bcn->civicloc = nla_data(tb[NL80211_FTM_RESP_ATTR_CIVICLOC]);
bcn->civicloc_len = nla_len(tb[NL80211_FTM_RESP_ATTR_CIVICLOC]);
}
} else {
bcn->ftm_responder = -1;
}
return 0;
}
@ -4189,7 +4234,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
!info->attrs[NL80211_ATTR_BEACON_HEAD])
return -EINVAL;
err = nl80211_parse_beacon(info->attrs, &params.beacon);
err = nl80211_parse_beacon(rdev, info->attrs, &params.beacon);
if (err)
return err;
@ -4373,7 +4418,7 @@ static int nl80211_set_beacon(struct sk_buff *skb, struct genl_info *info)
if (!wdev->beacon_interval)
return -EINVAL;
err = nl80211_parse_beacon(info->attrs, &params);
err = nl80211_parse_beacon(rdev, info->attrs, &params);
if (err)
return err;
@ -7935,7 +7980,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
if (!need_new_beacon)
goto skip_beacons;
err = nl80211_parse_beacon(info->attrs, &params.beacon_after);
err = nl80211_parse_beacon(rdev, info->attrs, &params.beacon_after);
if (err)
return err;
@ -7945,7 +7990,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
err = nl80211_parse_beacon(csa_attrs, &params.beacon_csa);
err = nl80211_parse_beacon(rdev, csa_attrs, &params.beacon_csa);
if (err)
return err;
@ -12984,6 +13029,76 @@ static int nl80211_tx_control_port(struct sk_buff *skb, struct genl_info *info)
return err;
}
static int nl80211_get_ftm_responder_stats(struct sk_buff *skb,
struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_ftm_responder_stats ftm_stats = {};
struct sk_buff *msg;
void *hdr;
struct nlattr *ftm_stats_attr;
int err;
if (wdev->iftype != NL80211_IFTYPE_AP || !wdev->beacon_interval)
return -EOPNOTSUPP;
err = rdev_get_ftm_responder_stats(rdev, dev, &ftm_stats);
if (err)
return err;
if (!ftm_stats.filled)
return -ENODATA;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = nl80211hdr_put(msg, info->snd_portid, info->snd_seq, 0,
NL80211_CMD_GET_FTM_RESPONDER_STATS);
if (!hdr)
return -ENOBUFS;
if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex))
goto nla_put_failure;
ftm_stats_attr = nla_nest_start(msg, NL80211_ATTR_FTM_RESPONDER_STATS);
if (!ftm_stats_attr)
goto nla_put_failure;
#define SET_FTM(field, name, type) \
do { if ((ftm_stats.filled & BIT(NL80211_FTM_STATS_ ## name)) && \
nla_put_ ## type(msg, NL80211_FTM_STATS_ ## name, \
ftm_stats.field)) \
goto nla_put_failure; } while (0)
#define SET_FTM_U64(field, name) \
do { if ((ftm_stats.filled & BIT(NL80211_FTM_STATS_ ## name)) && \
nla_put_u64_64bit(msg, NL80211_FTM_STATS_ ## name, \
ftm_stats.field, NL80211_FTM_STATS_PAD)) \
goto nla_put_failure; } while (0)
SET_FTM(success_num, SUCCESS_NUM, u32);
SET_FTM(partial_num, PARTIAL_NUM, u32);
SET_FTM(failed_num, FAILED_NUM, u32);
SET_FTM(asap_num, ASAP_NUM, u32);
SET_FTM(non_asap_num, NON_ASAP_NUM, u32);
SET_FTM_U64(total_duration_ms, TOTAL_DURATION_MSEC);
SET_FTM(unknown_triggers_num, UNKNOWN_TRIGGERS_NUM, u32);
SET_FTM(reschedule_requests_num, RESCHEDULE_REQUESTS_NUM, u32);
SET_FTM(out_of_window_triggers_num, OUT_OF_WINDOW_TRIGGERS_NUM, u32);
#undef SET_FTM
nla_nest_end(msg, ftm_stats_attr);
genlmsg_end(msg, hdr);
return genlmsg_reply(msg, info);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@ -13895,6 +14010,13 @@ static const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_GET_FTM_RESPONDER_STATS,
.doit = nl80211_get_ftm_responder_stats,
.policy = nl80211_policy,
.internal_flags = NL80211_FLAG_NEED_NETDEV |
NL80211_FLAG_NEED_RTNL,
},
};
static struct genl_family nl80211_fam __ro_after_init = {

15
net/wireless/rdev-ops.h
View File

@ -1232,4 +1232,19 @@ rdev_external_auth(struct cfg80211_registered_device *rdev,
return ret;
}
static inline int
rdev_get_ftm_responder_stats(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_ftm_responder_stats *ftm_stats)
{
int ret = -EOPNOTSUPP;
trace_rdev_get_ftm_responder_stats(&rdev->wiphy, dev, ftm_stats);
if (rdev->ops->get_ftm_responder_stats)
ret = rdev->ops->get_ftm_responder_stats(&rdev->wiphy, dev,
ftm_stats);
trace_rdev_return_int(&rdev->wiphy, ret);
return ret;
}
#endif /* __CFG80211_RDEV_OPS */

44
net/wireless/trace.h
View File

@ -3250,6 +3250,50 @@ DEFINE_EVENT(wiphy_wdev_evt, rdev_get_txq_stats,
TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev),
TP_ARGS(wiphy, wdev)
);
TRACE_EVENT(rdev_get_ftm_responder_stats,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,
struct cfg80211_ftm_responder_stats *ftm_stats),
TP_ARGS(wiphy, netdev, ftm_stats),
TP_STRUCT__entry(
WIPHY_ENTRY
NETDEV_ENTRY
__field(u64, timestamp)
__field(u32, success_num)
__field(u32, partial_num)
__field(u32, failed_num)
__field(u32, asap_num)
__field(u32, non_asap_num)
__field(u64, duration)
__field(u32, unknown_triggers)
__field(u32, reschedule)
__field(u32, out_of_window)
),
TP_fast_assign(
WIPHY_ASSIGN;
NETDEV_ASSIGN;
__entry->success_num = ftm_stats->success_num;
__entry->partial_num = ftm_stats->partial_num;
__entry->failed_num = ftm_stats->failed_num;
__entry->asap_num = ftm_stats->asap_num;
__entry->non_asap_num = ftm_stats->non_asap_num;
__entry->duration = ftm_stats->total_duration_ms;
__entry->unknown_triggers = ftm_stats->unknown_triggers_num;
__entry->reschedule = ftm_stats->reschedule_requests_num;
__entry->out_of_window = ftm_stats->out_of_window_triggers_num;
),
TP_printk(WIPHY_PR_FMT "Ftm responder stats: success %u, partial %u, "
"failed %u, asap %u, non asap %u, total duration %llu, unknown "
"triggers %u, rescheduled %u, out of window %u", WIPHY_PR_ARG,
__entry->success_num, __entry->partial_num, __entry->failed_num,
__entry->asap_num, __entry->non_asap_num, __entry->duration,
__entry->unknown_triggers, __entry->reschedule,
__entry->out_of_window)
);
#endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH