[PATCH 2/2] Client Taxonomy
Denton Gentry
dgentry at google.com
Wed Aug 10 15:52:33 PDT 2016
taxonomy: store probes in hostapd_sta_info.
A weakness in the initial client taxonomy mechanism is
from storing both the Probe and Associate in the sta_info_t.
The sta_info_t is created after a client associates, which
means that any Probes sent prior to association are not
retained. The Associate Request has to be seen, and then
another Probe request after association, before we have
a signature for the client.
Most clients send lots of Probes (lots and lots and lots
of Probes, actually), but a few do not. ChromeOS is notably
sparing in sending Probes, it can take a long time before
a signature for a ChromeOS device is available.
Store the most recent Probe Request in the hostapd_sta_info
tracking list. When a sta_info_t is created, move the probe
from the hostapd_sta_info to the sta_info_t.
Signed-off-by: dgentry at google.com (Denton Gentry)
Signed-off-by: denny at geekhold.com (Denton Gentry)
---
src/ap/beacon.c | 40 ++++++++++++++++++++++++++++++++++++----
src/ap/beacon.h | 3 +++
src/ap/hostapd.c | 2 +-
src/ap/hostapd.h | 2 ++
src/ap/ieee802_11.c | 2 +-
src/ap/sta_info.c | 3 +++
src/ap/taxonomy.c | 19 +++++++++++++++++--
src/ap/taxonomy.h | 6 ++++--
8 files changed, 67 insertions(+), 10 deletions(-)
diff --git a/src/ap/beacon.c b/src/ap/beacon.c
index 7cfc7f2..6eaa71e 100644
--- a/src/ap/beacon.c
+++ b/src/ap/beacon.c
@@ -578,6 +578,17 @@ static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
}
+void sta_track_del(struct hostapd_sta_info *info)
+{
+ if (info->probe_ie_taxonomy) {
+ os_free((void *)info->probe_ie_taxonomy);
+ info->probe_ie_taxonomy = NULL;
+ }
+
+ os_free(info);
+}
+
+
void sta_track_expire(struct hostapd_iface *iface, int force)
{
struct os_reltime now;
@@ -600,7 +611,7 @@ void sta_track_expire(struct hostapd_iface *iface, int force)
MAC2STR(info->addr));
dl_list_del(&info->list);
iface->num_sta_seen--;
- os_free(info);
+ sta_track_del(info);
}
}
@@ -673,6 +684,21 @@ sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr,
return NULL;
}
+void sta_track_claim_taxonomy_info(struct hostapd_iface *iface, const u8 *addr,
+ const u8 **probe_ie_taxonomy, size_t *probe_ie_taxonomy_len)
+{
+ struct hostapd_sta_info *info = sta_track_get(iface, addr);
+ if (!info) {
+ *probe_ie_taxonomy = NULL;
+ *probe_ie_taxonomy_len = 0;
+ return;
+ }
+
+ *probe_ie_taxonomy = info->probe_ie_taxonomy;
+ info->probe_ie_taxonomy = NULL;
+ *probe_ie_taxonomy_len = info->probe_ie_taxonomy_len;
+ info->probe_ie_taxonomy_len = 0;
+}
void handle_probe_req(struct hostapd_data *hapd,
const struct ieee80211_mgmt *mgmt, size_t len,
@@ -784,9 +810,15 @@ void handle_probe_req(struct hostapd_data *hapd,
#endif /* CONFIG_P2P */
{
- struct sta_info *sta = ap_get_sta(hapd, mgmt->sa);
- if (sta) {
- hostapd_taxonomy_probe_req(hapd, sta, ie, ie_len);
+ struct sta_info *sta;
+ struct hostapd_sta_info *info;
+
+ if ((sta = ap_get_sta(hapd, mgmt->sa)) != NULL) {
+ taxonomy_sta_info_probe_req(hapd, sta, ie, ie_len);
+ } else if ((info = sta_track_get(hapd->iface,
+ mgmt->sa)) != NULL) {
+ taxonomy_hostapd_sta_info_probe_req(hapd, info,
+ ie, ie_len);
}
}
diff --git a/src/ap/beacon.h b/src/ap/beacon.h
index d98f42e..266da39 100644
--- a/src/ap/beacon.h
+++ b/src/ap/beacon.h
@@ -22,9 +22,12 @@ int ieee802_11_build_ap_params(struct hostapd_data *hapd,
struct wpa_driver_ap_params *params);
void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params);
void sta_track_add(struct hostapd_iface *iface, const u8 *addr);
+void sta_track_del(struct hostapd_sta_info *info);
void sta_track_expire(struct hostapd_iface *iface, int force);
struct hostapd_data *
sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr,
const char *ifname);
+void sta_track_claim_taxonomy_info(struct hostapd_iface *iface, const u8 *addr,
+ const u8 **probe_ie_taxonomy, size_t *probe_ie_taxonomy_len);
#endif /* BEACON_H */
diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index 65f513d..e5ed0b1 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -374,7 +374,7 @@ static void sta_track_deinit(struct hostapd_iface *iface)
list))) {
dl_list_del(&info->list);
iface->num_sta_seen--;
- os_free(info);
+ sta_track_del(info);
}
}
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index 195679e..963d9cb 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -311,6 +311,8 @@ struct hostapd_sta_info {
struct dl_list list;
u8 addr[ETH_ALEN];
struct os_reltime last_seen;
+ const u8 *probe_ie_taxonomy;
+ size_t probe_ie_taxonomy_len;
};
/**
diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
index 52413cc..7d4f314 100644
--- a/src/ap/ieee802_11.c
+++ b/src/ap/ieee802_11.c
@@ -2251,7 +2251,7 @@ static void handle_assoc(struct hostapd_data *hapd,
* remove the STA immediately. */
sta->timeout_next = STA_NULLFUNC;
- hostapd_taxonomy_assoc_req(hapd, sta, pos, left);
+ taxonomy_sta_info_assoc_req(hapd, sta, pos, left);
fail:
/*
diff --git a/src/ap/sta_info.c b/src/ap/sta_info.c
index ed321f7..899cafd 100644
--- a/src/ap/sta_info.c
+++ b/src/ap/sta_info.c
@@ -671,6 +671,9 @@ struct sta_info * ap_sta_add(struct hostapd_data *hapd, const u8 *addr)
sta->last_seq_ctrl = WLAN_INVALID_MGMT_SEQ;
dl_list_init(&sta->ip6addr);
+ sta_track_claim_taxonomy_info(hapd->iface, addr,
+ &sta->probe_ie_taxonomy, &sta->probe_ie_taxonomy_len);
+
return sta;
}
diff --git a/src/ap/taxonomy.c b/src/ap/taxonomy.c
index 71f1645..3915b51 100644
--- a/src/ap/taxonomy.c
+++ b/src/ap/taxonomy.c
@@ -271,7 +271,7 @@ int retrieve_sta_taxonomy(const struct hostapd_data *hapd,
return 0;
}
-void hostapd_taxonomy_probe_req(const struct hostapd_data *hapd,
+void taxonomy_sta_info_probe_req(const struct hostapd_data *hapd,
struct sta_info *sta, const u8 *ie, size_t ie_len)
{
if (sta->probe_ie_taxonomy) {
@@ -286,7 +286,22 @@ void hostapd_taxonomy_probe_req(const struct hostapd_data *hapd,
}
}
-void hostapd_taxonomy_assoc_req(const struct hostapd_data *hapd,
+void taxonomy_hostapd_sta_info_probe_req(const struct hostapd_data *hapd,
+ struct hostapd_sta_info *info, const u8 *ie, size_t ie_len)
+{
+ if (info->probe_ie_taxonomy) {
+ os_free(info->probe_ie_taxonomy);
+ info->probe_ie_taxonomy = NULL;
+ info->probe_ie_taxonomy_len = 0;
+ }
+ if (hapd->iconf->client_taxonomy) {
+ info->probe_ie_taxonomy = os_malloc(ie_len);
+ os_memcpy(info->probe_ie_taxonomy, ie, ie_len);
+ info->probe_ie_taxonomy_len = ie_len;
+ }
+}
+
+void taxonomy_sta_info_assoc_req(const struct hostapd_data *hapd,
struct sta_info *sta, const u8 *ie, size_t ie_len)
{
if (sta->assoc_ie_taxonomy) {
diff --git a/src/ap/taxonomy.h b/src/ap/taxonomy.h
index 6d2ec39..3b88a4d 100644
--- a/src/ap/taxonomy.h
+++ b/src/ap/taxonomy.h
@@ -9,9 +9,11 @@
#ifndef TAXONOMY_H
#define TAXONOMY_H
-void hostapd_taxonomy_probe_req(const struct hostapd_data *hapd,
+void taxonomy_sta_info_probe_req(const struct hostapd_data *hapd,
struct sta_info *sta, const u8 *ie, size_t ie_len);
-void hostapd_taxonomy_assoc_req(const struct hostapd_data *hapd,
+void taxonomy_hostapd_sta_info_probe_req(const struct hostapd_data *hapd,
+ struct hostapd_sta_info *sta, const u8 *ie, size_t ie_len);
+void taxonomy_sta_info_assoc_req(const struct hostapd_data *hapd,
struct sta_info *sta, const u8 *ie, size_t ie_len);
int retrieve_sta_taxonomy(const struct hostapd_data *hapd,
struct sta_info *sta, char *buf, size_t buflen);
--
2.8.0.rc3.226.g39d4020
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