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cfg80211: convert S1G beacon to scan results

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The S1G beacon is an extension frame as opposed to
management frame for the regular beacon. This means we may
have to occasionally cast the frame buffer to a different
header type. Luckily this isn't too bad as scan results
mostly only care about the IEs.

Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
Link: https://lore.kernel.org/r/20200922022818.15855-6-thomas@adapt-ip.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Pedersen 2020-09-21 19:28:06 -07:00 committed by Johannes Berg
parent 7957c6c814
commit 9eaffe5078
2 changed files with 80 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
include/linux/ieee80211.h
View File

@ -151,6 +151,9 @@
#define IEEE80211_ANO_NETTYPE_WILD 15
/* bits unique to S1G beacon */
#define IEEE80211_S1G_BCN_NEXT_TBTT 0x100
/* control extension - for IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTL_EXT */
#define IEEE80211_CTL_EXT_POLL 0x2000
#define IEEE80211_CTL_EXT_SPR 0x3000
@ -553,6 +556,28 @@ static inline bool ieee80211_is_s1g_beacon(__le16 fc)
cpu_to_le16(IEEE80211_FTYPE_EXT | IEEE80211_STYPE_S1G_BEACON);
}
/**
* ieee80211_next_tbtt_present - check if IEEE80211_FTYPE_EXT &&
* IEEE80211_STYPE_S1G_BEACON && IEEE80211_S1G_BCN_NEXT_TBTT
* @fc: frame control bytes in little-endian byteorder
*/
static inline bool ieee80211_next_tbtt_present(__le16 fc)
{
return (fc & cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
cpu_to_le16(IEEE80211_FTYPE_EXT | IEEE80211_STYPE_S1G_BEACON) &&
fc & cpu_to_le16(IEEE80211_S1G_BCN_NEXT_TBTT);
}
/**
* ieee80211_is_s1g_short_beacon - check if next tbtt present bit is set. Only
* true for S1G beacons when they're short.
* @fc: frame control bytes in little-endian byteorder
*/
static inline bool ieee80211_is_s1g_short_beacon(__le16 fc)
{
return ieee80211_is_s1g_beacon(fc) && ieee80211_next_tbtt_present(fc);
}
/**
* ieee80211_is_atim - check if IEEE80211_FTYPE_MGMT && IEEE80211_STYPE_ATIM
* @fc: frame control bytes in little-endian byteorder
@ -1034,6 +1059,13 @@ struct ieee80211_ext {
u8 change_seq;
u8 variable[0];
} __packed s1g_beacon;
struct {
u8 sa[ETH_ALEN];
__le32 timestamp;
u8 change_seq;
u8 next_tbtt[3];
u8 variable[0];
} __packed s1g_short_beacon;
} u;
} __packed __aligned(2);

57
net/wireless/scan.c
View File

@ -2294,8 +2294,11 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
struct cfg80211_bss_ies *ies;
struct ieee80211_channel *channel;
bool signal_valid;
size_t ielen = len - offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
struct ieee80211_ext *ext = NULL;
u8 *bssid, *variable;
u16 capability, beacon_int;
size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
int bss_type;
BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
@ -2313,21 +2316,57 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
(data->signal < 0 || data->signal > 100)))
return NULL;
if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
ext = (void *) mgmt;
min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
min_hdr_len = offsetof(struct ieee80211_ext,
u.s1g_short_beacon.variable);
}
if (WARN_ON(len < min_hdr_len))
return NULL;
channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
ielen = len - min_hdr_len;
variable = mgmt->u.probe_resp.variable;
if (ext) {
if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
variable = ext->u.s1g_short_beacon.variable;
else
variable = ext->u.s1g_beacon.variable;
}
channel = cfg80211_get_bss_channel(wiphy, variable,
ielen, data->chan, data->scan_width);
if (!channel)
return NULL;
if (ext) {
struct ieee80211_s1g_bcn_compat_ie *compat;
u8 *ie;
ie = (void *)cfg80211_find_ie(WLAN_EID_S1G_BCN_COMPAT,
variable, ielen);
if (!ie)
return NULL;
compat = (void *)(ie + 2);
bssid = ext->u.s1g_beacon.sa;
capability = le16_to_cpu(compat->compat_info);
beacon_int = le16_to_cpu(compat->beacon_int);
} else {
bssid = mgmt->bssid;
beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
}
ies = kzalloc(sizeof(*ies) + ielen, gfp);
if (!ies)
return NULL;
ies->len = ielen;
ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
ieee80211_is_s1g_beacon(mgmt->frame_control);
memcpy(ies->data, variable, ielen);
if (ieee80211_is_probe_resp(mgmt->frame_control))
rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
@ -2335,12 +2374,12 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
rcu_assign_pointer(tmp.pub.beacon_ies, ies);
rcu_assign_pointer(tmp.pub.ies, ies);
memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
tmp.pub.beacon_interval = beacon_int;
tmp.pub.capability = capability;
tmp.pub.channel = channel;
tmp.pub.scan_width = data->scan_width;
tmp.pub.signal = data->signal;
tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
tmp.ts_boottime = data->boottime_ns;
tmp.parent_tsf = data->parent_tsf;
tmp.pub.chains = data->chains;