mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-12-23 14:22:36 +01:00
ap: Handle Probe Request frames
Parse probe requests and send probe responses to show up in active scans.
This commit is contained in:
parent
45c4e0589b
commit
d8378c5a0f
162
src/ap.c
162
src/ap.c
@ -34,10 +34,12 @@
|
||||
#include "src/iwd.h"
|
||||
#include "src/scan.h"
|
||||
#include "src/device.h"
|
||||
#include "src/netdev.h"
|
||||
#include "src/wiphy.h"
|
||||
#include "src/crypto.h"
|
||||
#include "src/ie.h"
|
||||
#include "src/mpdu.h"
|
||||
#include "src/util.h"
|
||||
#include "src/ap.h"
|
||||
|
||||
struct ap_state {
|
||||
@ -49,6 +51,7 @@ struct ap_state {
|
||||
unsigned int ciphers;
|
||||
uint32_t beacon_interval;
|
||||
struct l_uintset *rates;
|
||||
struct l_queue *frame_watch_ids;
|
||||
uint32_t start_stop_cmd_id;
|
||||
};
|
||||
|
||||
@ -56,14 +59,26 @@ static struct l_genl_family *nl80211 = NULL;
|
||||
|
||||
static struct l_queue *ap_list = NULL;
|
||||
|
||||
static void ap_frame_watch_remove(void *data, void *user_data)
|
||||
{
|
||||
struct netdev *netdev = user_data;
|
||||
|
||||
if (L_PTR_TO_UINT(data))
|
||||
netdev_frame_watch_remove(netdev, L_PTR_TO_UINT(data));
|
||||
}
|
||||
|
||||
static void ap_free(void *data)
|
||||
{
|
||||
struct ap_state *ap = data;
|
||||
struct netdev *netdev = device_get_netdev(ap->device);
|
||||
|
||||
l_free(ap->ssid);
|
||||
memset(ap->psk, 0, strlen(ap->psk));
|
||||
l_free(ap->psk);
|
||||
|
||||
l_queue_foreach(ap->frame_watch_ids, ap_frame_watch_remove, netdev);
|
||||
l_queue_destroy(ap->frame_watch_ids, NULL);
|
||||
|
||||
if (ap->start_stop_cmd_id)
|
||||
l_genl_family_cancel(nl80211, ap->start_stop_cmd_id);
|
||||
|
||||
@ -165,6 +180,139 @@ static size_t ap_build_beacon_pr_tail(struct ap_state *ap, uint8_t *out_buf)
|
||||
return len;
|
||||
}
|
||||
|
||||
static uint32_t ap_send_mgmt_frame(struct ap_state *ap,
|
||||
const struct mmpdu_header *frame,
|
||||
size_t frame_len, bool wait_ack,
|
||||
l_genl_msg_func_t callback,
|
||||
void *user_data)
|
||||
{
|
||||
struct l_genl_msg *msg;
|
||||
uint32_t ifindex = device_get_ifindex(ap->device);
|
||||
uint32_t id;
|
||||
uint32_t ch_freq = scan_channel_to_freq(ap->channel, SCAN_BAND_2_4_GHZ);
|
||||
|
||||
msg = l_genl_msg_new_sized(NL80211_CMD_FRAME, 128 + frame_len);
|
||||
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &ch_freq);
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_FRAME, frame_len, frame);
|
||||
if (!wait_ack)
|
||||
l_genl_msg_append_attr(msg, NL80211_ATTR_DONT_WAIT_FOR_ACK,
|
||||
0, NULL);
|
||||
|
||||
id = l_genl_family_send(nl80211, msg, callback, user_data, NULL);
|
||||
|
||||
if (!id)
|
||||
l_genl_msg_unref(msg);
|
||||
|
||||
return id;
|
||||
}
|
||||
|
||||
static void ap_probe_resp_cb(struct l_genl_msg *msg, void *user_data)
|
||||
{
|
||||
if (l_genl_msg_get_error(msg) < 0)
|
||||
l_error("AP Probe Response not sent: %i",
|
||||
l_genl_msg_get_error(msg));
|
||||
else
|
||||
l_info("AP Probe Response sent OK");
|
||||
}
|
||||
|
||||
/*
|
||||
* Parse Probe Request according to 802.11-2016 9.3.3.10 and act according
|
||||
* to 802.11-2016 11.1.4.3
|
||||
*/
|
||||
static void ap_probe_req_cb(struct netdev *netdev,
|
||||
const struct mmpdu_header *hdr,
|
||||
const void *body, size_t body_len,
|
||||
void *user_data)
|
||||
{
|
||||
struct ap_state *ap = user_data;
|
||||
const struct mmpdu_probe_request *req = body;
|
||||
const char *ssid = NULL;
|
||||
const uint8_t *ssid_list = NULL;
|
||||
size_t ssid_len = 0, ssid_list_len = 0, len;
|
||||
int dsss_channel = -1;
|
||||
struct ie_tlv_iter iter;
|
||||
const uint8_t *bssid = device_get_address(ap->device);
|
||||
bool match = false;
|
||||
uint8_t resp[512];
|
||||
|
||||
l_info("AP Probe Request from %s",
|
||||
util_address_to_string(hdr->address_2));
|
||||
|
||||
ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req));
|
||||
|
||||
while (ie_tlv_iter_next(&iter))
|
||||
switch (ie_tlv_iter_get_tag(&iter)) {
|
||||
case IE_TYPE_SSID:
|
||||
ssid = (const char *) ie_tlv_iter_get_data(&iter);
|
||||
ssid_len = ie_tlv_iter_get_length(&iter);
|
||||
break;
|
||||
|
||||
case IE_TYPE_SSID_LIST:
|
||||
ssid_list = ie_tlv_iter_get_data(&iter);
|
||||
ssid_list_len = ie_tlv_iter_get_length(&iter);
|
||||
break;
|
||||
|
||||
case IE_TYPE_DSSS_PARAMETER_SET:
|
||||
if (ie_tlv_iter_get_length(&iter) != 1)
|
||||
return;
|
||||
|
||||
dsss_channel = ie_tlv_iter_get_data(&iter)[0];
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check if we should reply to this Probe Request according to
|
||||
* 802.11-2016 section 11.1.4.3.2.
|
||||
*/
|
||||
|
||||
if (memcmp(hdr->address_1, bssid, 6) &&
|
||||
!util_is_broadcast_address(hdr->address_1))
|
||||
match = false;
|
||||
|
||||
if (memcmp(hdr->address_3, bssid, 6) &&
|
||||
!util_is_broadcast_address(hdr->address_3))
|
||||
match = false;
|
||||
|
||||
if (!ssid || ssid_len == 0) /* Wildcard SSID */
|
||||
match = true;
|
||||
else if (ssid && ssid_len == strlen(ap->ssid) && /* Specific SSID */
|
||||
!memcmp(ssid, ap->ssid, ssid_len))
|
||||
match = true;
|
||||
else if (ssid_list) { /* SSID List */
|
||||
ie_tlv_iter_init(&iter, ssid_list, ssid_list_len);
|
||||
|
||||
while (ie_tlv_iter_next(&iter)) {
|
||||
if (ie_tlv_iter_get_tag(&iter) != IE_TYPE_SSID)
|
||||
return;
|
||||
|
||||
ssid = (const char *) ie_tlv_iter_get_data(&iter);
|
||||
ssid_len = ie_tlv_iter_get_length(&iter);
|
||||
|
||||
if (ssid_len == strlen(ap->ssid) &&
|
||||
!memcmp(ssid, ap->ssid, ssid_len)) {
|
||||
match = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (dsss_channel != -1 && dsss_channel != ap->channel)
|
||||
match = false;
|
||||
|
||||
if (!match)
|
||||
return;
|
||||
|
||||
len = ap_build_beacon_pr_head(ap,
|
||||
MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE,
|
||||
hdr->address_2, resp);
|
||||
len += ap_build_beacon_pr_tail(ap, resp + len);
|
||||
|
||||
ap_send_mgmt_frame(ap, (struct mmpdu_header *) resp, len, false,
|
||||
ap_probe_resp_cb, NULL);
|
||||
}
|
||||
|
||||
static void ap_stopped(struct ap_state *ap)
|
||||
{
|
||||
ap->event_cb(ap->device, AP_EVENT_STOPPED);
|
||||
@ -259,9 +407,12 @@ static struct l_genl_msg *ap_build_cmd_start_ap(struct ap_state *ap)
|
||||
int ap_start(struct device *device, const char *ssid, const char *psk,
|
||||
ap_event_cb_t event_cb)
|
||||
{
|
||||
struct netdev *netdev = device_get_netdev(device);
|
||||
struct wiphy *wiphy = device_get_wiphy(device);
|
||||
struct ap_state *ap;
|
||||
struct l_genl_msg *cmd;
|
||||
const struct l_queue_entry *entry;
|
||||
uint32_t id;
|
||||
|
||||
if (l_queue_find(ap_list, ap_match_device, device))
|
||||
return -EEXIST;
|
||||
@ -281,6 +432,17 @@ int ap_start(struct device *device, const char *ssid, const char *psk,
|
||||
l_uintset_put(ap->rates, 2); /* 1 Mbps*/
|
||||
l_uintset_put(ap->rates, 11); /* 5.5 Mbps*/
|
||||
l_uintset_put(ap->rates, 22); /* 11 Mbps*/
|
||||
ap->frame_watch_ids = l_queue_new();
|
||||
|
||||
id = netdev_frame_watch_add(netdev, 0x0000 |
|
||||
(MPDU_MANAGEMENT_SUBTYPE_PROBE_REQUEST << 4),
|
||||
NULL, 0, ap_probe_req_cb, ap);
|
||||
l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id));
|
||||
|
||||
for (entry = l_queue_get_entries(ap->frame_watch_ids); entry;
|
||||
entry = entry->next)
|
||||
if (!L_PTR_TO_UINT(entry->data))
|
||||
goto error;
|
||||
|
||||
cmd = ap_build_cmd_start_ap(ap);
|
||||
if (!cmd)
|
||||
|
Loading…
Reference in New Issue
Block a user