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hearing_map.c
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hearing_map.c
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2021 Jan Braun <[email protected]>
* Copyright (C) 2021 Nico Petermann <[email protected]>
* Copyright (C) 2021 Tomas Duchac <[email protected]>
* Copyright (C) 2021 Philip Jonas Franz <[email protected]>
*/
#include <sys/types.h>
#include <stdlib.h>
#ifdef linux
#include <netinet/ether.h>
#endif
#include <libubox/avl-cmp.h>
#include <libubox/blobmsg_json.h>
#include "node.h"
#include "usteer.h"
#include "hearing_map.h"
static struct blob_buf b;
struct usteer_node*
get_usteer_node_from_bssid(uint8_t *bssid)
{
struct usteer_node *node;
avl_for_each_element(&local_nodes, node, avl)
{
if (memcmp(&node->bssid, bssid, 6) == 0)
return node;
}
struct usteer_remote_node *rn;
avl_for_each_element(&remote_nodes, rn, avl) {
if (memcmp(&rn->node.bssid, bssid, 6) == 0)
return &rn->node;
}
return NULL;
}
static inline void
usteer_beacon_report_free(struct beacon_report *br)
{
list_del(&br->sta_list);
free(br);
}
static bool
usteer_beacon_report_delete(struct beacon_report *br, uint8_t *bssid)
{
if (bssid && memcmp(br->bssid, bssid, 6) == 0) {
usteer_beacon_report_free(br);
return true;
}
uint64_t time_diff = current_time - br->usteer_time;
uint64_t time_diff_conf = config.beacon_report_invalide_timeout * 1000;
if (time_diff_conf < time_diff) {
usteer_beacon_report_free(br);
return true;
}
return false;
}
void usteer_ubus_hearing_map(struct blob_buf *bm, struct sta_info *si)
{
struct beacon_report *br;
void *_hm, *_nr;
_hm = blobmsg_open_table(bm, "hearing_map");
list_for_each_entry(br, &si->beacon_reports, sta_list) {
_nr = blobmsg_open_table(bm, ether_ntoa((struct ether_addr *) br->bssid));
struct usteer_node *node = get_usteer_node_from_bssid(br->bssid);
if (node)
blobmsg_add_string(bm, "node", usteer_node_name(node));
uint64_t diff_secs = (current_time - br->usteer_time) / 1000;
uint64_t ttl = config.beacon_report_invalide_timeout - diff_secs;
blobmsg_add_u16(bm, "rcpi", br->rcpi);
blobmsg_add_u16(bm, "rsni", br->rsni);
blobmsg_add_u16(bm, "op_class", br->op_class);
blobmsg_add_u16(bm, "channel", br->channel);
blobmsg_add_u64(bm, "time-to-live", ttl);
blobmsg_close_table(bm, _nr);
}
blobmsg_close_table(bm, _hm);
}
static void
usteer_beacon_request_send(struct sta_info * si, int freq, uint8_t mode)
{
static struct ubus_request req;
struct usteer_local_node *ln = container_of(si->node, struct usteer_local_node, node);
int channel = get_channel_from_freq(freq);
int opClass = get_op_class_from_channel(channel);
blob_buf_init(&b, 0);
blobmsg_printf(&b, "addr", MAC_ADDR_FMT, MAC_ADDR_DATA(si->sta->addr));
blobmsg_add_u32(&b, "mode", mode);
blobmsg_add_u32(&b, "duration", 200);
blobmsg_add_u32(&b, "channel", channel);
blobmsg_add_u32(&b, "op_class", opClass);
blobmsg_add_string(&b, "bssid", "ff:ff:ff:ff:ff:ff");
ubus_invoke_async(ubus_ctx, ln->obj_id, "rrm_beacon_req", b.head, &req);
req.data_cb = NULL;
MSG(DEBUG, "send beacon-request {channel=%d, mode=%hhu} on %s to "MAC_ADDR_FMT,
channel, mode, ln->iface, MAC_ADDR_DATA(si->sta->addr));
}
int get_channel_from_freq(int freq)
{
/* see 802.11-2007 17.3.8.3.2 and Annex J */
if (freq == 2484)
return 14;
else if (freq < 2484)
return (freq - 2407) / 5;
else if (freq >= 4910 && freq <= 4980)
return (freq - 4000) / 5;
else if (freq <= 45000)
return (freq - 5000) / 5;
else if (freq >= 58320 && freq <= 64800)
return (freq - 56160) / 2160;
else
return 0;
}
int get_op_class_from_channel(int channel)
{
if (channel >= 36 && channel <= 48 )
return 115;
else if(channel >= 52 && channel <= 64 )
return 118;
else if(channel >= 100 && channel <= 140 )
return 121;
else if(channel >= 1 && channel <= 13 )
return 81;
else
return 0;
}
enum {
BEACON_REP_ADDR,
BEACON_REP_OP_CLASS,
BEACON_REP_CHANNEL,
BEACON_REP_RCPI,
BEACON_REP_RSNI,
BEACON_REP_BSSID,
__BEACON_REP_MAX,
};
static const struct blobmsg_policy beacon_rep_policy[__BEACON_REP_MAX] = {
[BEACON_REP_BSSID] = {.name = "bssid", .type = BLOBMSG_TYPE_STRING},
[BEACON_REP_ADDR] = {.name = "address", .type = BLOBMSG_TYPE_STRING},
[BEACON_REP_OP_CLASS] = {.name = "op-class", .type = BLOBMSG_TYPE_INT16},
[BEACON_REP_CHANNEL] = {.name = "channel", .type = BLOBMSG_TYPE_INT16},
[BEACON_REP_RCPI] = {.name = "rcpi", .type = BLOBMSG_TYPE_INT16},
[BEACON_REP_RSNI] = {.name = "rsni", .type = BLOBMSG_TYPE_INT16},
};
static uint8_t
usteer_get_beacon_request_mode(struct sta_info *si, int freq)
{
struct beacon_request *br = &si->beacon_request;
if (si->node->freq == freq) {
long time_diff = br->lastReportTime - br->lastRequestTime;
if (0 < time_diff)
br->failed_requests /= 2;
br->failed_requests++;
}
int failed_requests = br->failed_requests;
if (freq < 4000) {
if (failed_requests < 3)
return 1;
if (failed_requests < 7)
return 0;
}
if (freq > 4000 && failed_requests < 5)
return 0;
return 2;
}
static inline int
usteer_beacon_request_next_band(struct sta_info *si, int freq)
{
struct usteer_node *node;
bool band_already_scanned = true;
/*
* search for next band that was not used in this scan request
* assums that no two local_nodes are using the same channel/frequency
*/
avl_for_each_element(&local_nodes, node, avl) {
if (freq == node->freq) {
band_already_scanned = false;
continue;
}
if (band_already_scanned)
continue;
return node->freq;
}
node = avl_first_element(&local_nodes, node, avl); // last -> first (cycle list)
return node->freq;
}
void usteer_beacon_request_check(struct sta_info *si)
{
struct beacon_request *br = &si->beacon_request;
struct usteer_node *node = si->node;
uint64_t ctime = current_time;
int freq = br->band;
/*
* based on the current reception, determine a the frequency beacon requests are sent.
* Adjust signal range from (-90 to -30) to (-30 to 30)
* */
float adj_signal = (float) (si->signal + 60);
float dyn_freq = config.beacon_request_frequency +
(config.beacon_request_signal_modifier * (adj_signal / (1 + abs(adj_signal))));
if (freq == node->freq && ctime - br->lastRequestTime < dyn_freq)
return;
uint8_t mode = usteer_get_beacon_request_mode(si, freq); // run before lastRequestTime is renewed
usteer_beacon_request_send(si, freq, mode);
/* do only once in a scan row (multiple bands) */
if (br->band == node->freq) {
br->lastRequestTime = ctime;
uint8_t bssid[6];
memset(bssid, 255, 6); // FF:FF:FF:FF:FF:FF should be a invalid bssid
usteer_beacon_report_cleanup(si, bssid);
}
/* select next band for scanning */
br->band = usteer_beacon_request_next_band(si, freq);
}
void usteer_beacon_report_cleanup(struct sta_info *si, uint8_t *bssid)
{
struct beacon_report *br, *tmp;
list_for_each_entry_safe(br, tmp, &si->beacon_reports, sta_list)
bssid ? usteer_beacon_report_delete(br, bssid)
: usteer_beacon_report_free(br);
}
void usteer_handle_event_beacon_report(struct usteer_local_node *ln, struct blob_attr *msg)
{
struct usteer_node *node = &ln->node;
struct blob_attr *tb[__BEACON_REP_MAX];
struct beacon_report *br;
struct sta_info *si;
struct sta *sta;
blobmsg_parse(beacon_rep_policy, __BEACON_REP_MAX, tb, blob_data(msg), blob_len(msg));
if(!tb[BEACON_REP_BSSID] || !tb[BEACON_REP_ADDR])
return;
char *address = blobmsg_get_string(tb[BEACON_REP_ADDR]);
uint8_t *addr_sta = (uint8_t *) ether_aton(address);
sta = usteer_sta_get(addr_sta, false);
if(!sta) return;
si = usteer_sta_info_get(sta, node, NULL);
if (!si) return;
char *bssid = blobmsg_get_string(tb[BEACON_REP_BSSID]);
uint8_t *addr = (uint8_t *) ether_aton(bssid);
if(!get_usteer_node_from_bssid(addr))
return;
br = malloc(sizeof(struct beacon_report));
br->address = si;
memcpy(br->bssid, addr, sizeof(br->bssid));
br->rcpi = blobmsg_get_u16(tb[BEACON_REP_RCPI]);
br->rsni = blobmsg_get_u16(tb[BEACON_REP_RSNI]);
br->op_class = blobmsg_get_u16(tb[BEACON_REP_OP_CLASS]);
br->channel = blobmsg_get_u16(tb[BEACON_REP_CHANNEL]);
br->usteer_time = current_time; // beacon_report_invalide_timeout
si->beacon_request.lastReportTime = br->usteer_time;
MSG(DEBUG, "received beacon-report {op-class=%d, channel=%d, rcpi=%d, rsni=%d, bssid=%s} on %s from %s",
br->op_class, br->channel, br->rcpi, br->rsni, bssid, ln->iface, address);
usteer_beacon_report_cleanup(si, br->bssid);
list_add(&br->sta_list, &si->beacon_reports);
}