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nl80211: Add API to support VHT MU-MIMO air sniffer

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add API to support VHT MU-MIMO air sniffer.
in MU-MIMO there are parallel frames on the air while the HW
has only one RX.
add the capability to sniff one of the MU-MIMO parallel frames by
giving the sniffer additional information so it'll know which
of the parallel frames it shall follow.

Add attribute - NL80211_ATTR_MU_MIMO_GROUP_DATA - for getting
a MU-MIMO groupID in order to monitor packets from that group
using VHT MU-MIMO.
And add attribute -NL80211_ATTR_MU_MIMO_FOLLOW_ADDR - for passing
MAC address to monitor mode.
that option will be used by VHT MU-MIMO air sniffer to follow a
station according to it's MAC address using VHT MU-MIMO.

Signed-off-by: Aviya Erenfeld <aviya.erenfeld@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Aviya Erenfeld 2016-07-05 15:23:08 +03:00 committed by Johannes Berg
parent f89e07d4cf
commit c6e6a0c8be
3 changed files with 73 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/net/cfg80211.h
View File

@ -330,6 +330,9 @@ struct ieee80211_supported_band {
* in a separate chapter.
*/
#define VHT_MUMIMO_GROUPS_DATA_LEN (WLAN_MEMBERSHIP_LEN +\
WLAN_USER_POSITION_LEN)
/**
* struct vif_params - describes virtual interface parameters
* @use_4addr: use 4-address frames
@ -339,10 +342,13 @@ struct ieee80211_supported_band {
* This feature is only fully supported by drivers that enable the
* %NL80211_FEATURE_MAC_ON_CREATE flag. Others may support creating
** only p2p devices with specified MAC.
* @vht_mumimo_groups: MU-MIMO groupID. used for monitoring only
* packets belonging to that MU-MIMO groupID.
*/
struct vif_params {
int use_4addr;
u8 macaddr[ETH_ALEN];
int use_4addr;
u8 macaddr[ETH_ALEN];
u8 vht_mumimo_groups[VHT_MUMIMO_GROUPS_DATA_LEN];
};
/**

29
include/uapi/linux/nl80211.h
View File

@ -1829,6 +1829,25 @@ enum nl80211_commands {
* %NL80211_ATTR_EXT_CAPA_MASK, to specify the extended capabilities per
* interface type.
*
* @NL80211_ATTR_MU_MIMO_GROUP_DATA: array of 24 bytes that defines a MU-MIMO
* groupID for monitor mode.
* The first 8 bytes are a mask that defines the membership in each
* group (there are 64 groups, group 0 and 63 are reserved),
* each bit represents a group and set to 1 for being a member in
* that group and 0 for not being a member.
* The remaining 16 bytes define the position in each group: 2 bits for
* each group.
* (smaller group numbers represented on most significant bits and bigger
* group numbers on least significant bits.)
* This attribute is used only if all interfaces are in monitor mode.
* Set this attribute in order to monitor packets using the given MU-MIMO
* groupID data.
* to turn off that feature set all the bits of the groupID to zero.
* @NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR: mac address for the sniffer to follow
* when using MU-MIMO air sniffer.
* to turn that feature off set an invalid mac address
* (e.g. FF:FF:FF:FF:FF:FF)
*
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@ -2213,6 +2232,9 @@ enum nl80211_attrs {
NL80211_ATTR_IFTYPE_EXT_CAPA,
NL80211_ATTR_MU_MIMO_GROUP_DATA,
NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -4479,6 +4501,12 @@ enum nl80211_feature_flags {
* %NL80211_CMD_ASSOCIATE and %NL80211_CMD_CONNECT requests, which will set
* the ASSOC_REQ_USE_RRM flag in the association request even if
* NL80211_FEATURE_QUIET is not advertized.
* @NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER: This device supports MU-MIMO air
* sniffer which means that it can be configured to hear packets from
* certain groups which can be configured by the
* %NL80211_ATTR_MU_MIMO_GROUP_DATA attribute,
* or can be configured to follow a station by configuring the
* %NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR attribute.
*
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@ -4486,6 +4514,7 @@ enum nl80211_feature_flags {
enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_VHT_IBSS,
NL80211_EXT_FEATURE_RRM,
NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,

36
net/wireless/nl80211.c
View File

@ -405,6 +405,10 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_PBSS] = { .type = NLA_FLAG },
[NL80211_ATTR_BSS_SELECT] = { .type = NLA_NESTED },
[NL80211_ATTR_STA_SUPPORT_P2P_PS] = { .type = NLA_U8 },
[NL80211_ATTR_MU_MIMO_GROUP_DATA] = {
.len = VHT_MUMIMO_GROUPS_DATA_LEN
},
[NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR] = { .len = ETH_ALEN },
};
/* policy for the key attributes */
@ -2695,6 +2699,38 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
change = true;
}
if (info->attrs[NL80211_ATTR_MU_MIMO_GROUP_DATA]) {
const u8 *mumimo_groups;
u32 cap_flag = NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER;
if (!wiphy_ext_feature_isset(&rdev->wiphy, cap_flag))
return -EOPNOTSUPP;
mumimo_groups =
nla_data(info->attrs[NL80211_ATTR_MU_MIMO_GROUP_DATA]);
/* bits 0 and 63 are reserved and must be zero */
if ((mumimo_groups[0] & BIT(7)) ||
(mumimo_groups[VHT_MUMIMO_GROUPS_DATA_LEN - 1] & BIT(0)))
return -EINVAL;
memcpy(params.vht_mumimo_groups, mumimo_groups,
VHT_MUMIMO_GROUPS_DATA_LEN);
change = true;
}
if (info->attrs[NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR]) {
u32 cap_flag = NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER;
if (!wiphy_ext_feature_isset(&rdev->wiphy, cap_flag))
return -EOPNOTSUPP;
nla_memcpy(params.macaddr,
info->attrs[NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR],
ETH_ALEN);
change = true;
}
if (flags && (*flags & MONITOR_FLAG_ACTIVE) &&
!(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR))
return -EOPNOTSUPP;