#include <yajl/yajl_version.h>
#ifdef LINUX
-#include <iwlib.h>
-#else
-#ifndef __FreeBSD__
+#include <errno.h>
+#include <net/if.h>
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/ctrl.h>
+#include <linux/nl80211.h>
+#include <linux/if_ether.h>
#define IW_ESSID_MAX_SIZE 32
#endif
-#endif
#ifdef __FreeBSD__
#include <sys/param.h>
typedef struct {
int flags;
char essid[IW_ESSID_MAX_SIZE + 1];
+ uint8_t bssid[ETH_ALEN];
int quality;
int quality_max;
int quality_average;
double frequency;
} wireless_info_t;
-static int get_wireless_info(const char *interface, wireless_info_t *info) {
- memset(info, 0, sizeof(wireless_info_t));
-
-#ifdef LINUX
- int skfd = iw_sockets_open();
- if (skfd < 0) {
- perror("iw_sockets_open");
- return 0;
+// Like iw_print_bitrate, but without the dependency on libiw.
+static void print_bitrate(char *buffer, int buflen, int bitrate) {
+ const int kilo = 1e3;
+ const int mega = 1e6;
+ const int giga = 1e9;
+
+ const double rate = bitrate;
+ char scale;
+ int divisor;
+
+ if (rate >= giga) {
+ scale = 'G';
+ divisor = giga;
+ } else if (rate >= mega) {
+ scale = 'M';
+ divisor = mega;
+ } else {
+ scale = 'k';
+ divisor = kilo;
}
+ snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
+}
- wireless_config wcfg;
- if (iw_get_basic_config(skfd, interface, &wcfg) < 0) {
- close(skfd);
- return 0;
- }
+static uint32_t nl80211_xbm_to_percent(int32_t xbm, uint32_t divisor) {
+#define NOISE_FLOOR_DBM -90
+#define SIGNAL_MAX_DBM -20
- if (wcfg.has_essid && wcfg.essid_on) {
- info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
- strncpy(&info->essid[0], wcfg.essid, IW_ESSID_MAX_SIZE);
- info->essid[IW_ESSID_MAX_SIZE] = '\0';
+ xbm /= divisor;
+ if (xbm < NOISE_FLOOR_DBM)
+ xbm = NOISE_FLOOR_DBM;
+ if (xbm > SIGNAL_MAX_DBM)
+ xbm = SIGNAL_MAX_DBM;
+
+ return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
+}
+
+#define WLAN_EID_SSID 0
+
+static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
+ *ssid = NULL;
+ *ssid_len = 0;
+
+ while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
+ ies_len -= ies[1] + 2;
+ ies += ies[1] + 2;
}
+ if (ies_len < 2)
+ return;
+ if (ies_len < 2 + ies[1])
+ return;
+
+ *ssid_len = ies[1];
+ *ssid = ies + 2;
+}
+
+static int gwi_sta_cb(struct nl_msg *msg, void *data) {
+ wireless_info_t *info = data;
+
+ struct nlattr *tb[NL80211_ATTR_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
+ struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
+ static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
+ [NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
+ };
+
+ static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
+ [NL80211_RATE_INFO_BITRATE32] = {.type = NLA_U32},
+ };
+
+ if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
+ return NL_SKIP;
+
+ if (tb[NL80211_ATTR_STA_INFO] == NULL)
+ return NL_SKIP;
+
+ if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
+ return NL_SKIP;
+
+ if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
+ return NL_SKIP;
+
+ if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
+ return NL_SKIP;
+
+ if (rinfo[NL80211_RATE_INFO_BITRATE32] == NULL)
+ return NL_SKIP;
+
+ // NL80211_RATE_INFO_BITRATE32 is specified in units of 100 kbit/s, but iw
+ // used to specify bit/s, so we convert to use the same code path.
+ info->bitrate = nla_get_u32(rinfo[NL80211_RATE_INFO_BITRATE32]) * 100 * 1000;
+
+ return NL_SKIP;
+}
+
+static int gwi_scan_cb(struct nl_msg *msg, void *data) {
+ wireless_info_t *info = data;
+ struct genlmsghdr *gnlh = genlmsg_hdr(nlmsg_hdr(msg));
+ struct nlattr *tb[NL80211_ATTR_MAX + 1];
+ struct nlattr *bss[NL80211_BSS_MAX + 1];
+ struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
+ [NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
+ [NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
+ [NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
+ [NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
+ [NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
+ [NL80211_BSS_STATUS] = {.type = NLA_U32},
+ };
+
+ if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
+ return NL_SKIP;
+
+ if (tb[NL80211_ATTR_BSS] == NULL)
+ return NL_SKIP;
+
+ if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
+ return NL_SKIP;
+
+ if (bss[NL80211_BSS_STATUS] == NULL)
+ return NL_SKIP;
+
+ const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
- if (wcfg.has_freq) {
- info->frequency = wcfg.freq;
+ if (status != NL80211_BSS_STATUS_ASSOCIATED &&
+ status != NL80211_BSS_STATUS_IBSS_JOINED)
+ return NL_SKIP;
+
+ if (bss[NL80211_BSS_BSSID] == NULL)
+ return NL_SKIP;
+
+ memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
+
+ if (bss[NL80211_BSS_FREQUENCY]) {
info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
+ info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
}
- /* If the function iw_get_stats does not return proper stats, the
- * wifi is considered as down.
- * Since ad-hoc network does not have theses stats, we need to return
- * here for this mode. */
- if (wcfg.mode == 1) {
- close(skfd);
- return 1;
- }
+ if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
+ info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
+ info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
+ info->signal_level_max = 100;
- /* Wireless quality is a relative value in a driver-specific range.
- * Signal and noise level can be either relative or absolute values
- * in dBm. Furthermore, noise and quality can be expressed directly
- * in dBm or in RCPI (802.11k), which we convert to dBm. When those
- * values are expressed directly in dBm, they range from -192 to 63,
- * and since the values are packed into 8 bits, we need to perform
- * 8-bit arithmetic on them. Assume absolute values if everything
- * else fails (driver bug). */
-
- iwrange range;
- if (iw_get_range_info(skfd, interface, &range) < 0) {
- close(skfd);
- return 0;
+ info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
+ info->quality = info->signal_level;
+ info->quality_max = 100;
+ info->quality_average = 50;
}
- iwstats stats;
- if (iw_get_stats(skfd, interface, &stats, &range, 1) < 0) {
- close(skfd);
- return 0;
+ if (bss[NL80211_BSS_SIGNAL_MBM]) {
+ info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
+ info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
+
+ info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
+ info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
+ info->quality_max = 100;
+ info->quality_average = 50;
}
- if (stats.qual.level != 0 || (stats.qual.updated & (IW_QUAL_DBM | IW_QUAL_RCPI))) {
- if (!(stats.qual.updated & IW_QUAL_QUAL_INVALID)) {
- info->quality = stats.qual.qual;
- info->quality_max = range.max_qual.qual;
- info->quality_average = range.avg_qual.qual;
- info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
- }
+ if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
+ uint8_t *ssid;
+ uint32_t ssid_len;
- if (stats.qual.updated & IW_QUAL_RCPI) {
- if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
- info->signal_level = stats.qual.level / 2.0 - 110 + 0.5;
- info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
- }
- if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
- info->noise_level = stats.qual.noise / 2.0 - 110 + 0.5;
- info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
- }
- } else {
- if ((stats.qual.updated & IW_QUAL_DBM) || stats.qual.level > range.max_qual.level) {
- if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
- info->signal_level = stats.qual.level;
- if (info->signal_level > 63)
- info->signal_level -= 256;
- info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
- }
- if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
- info->noise_level = stats.qual.noise;
- if (info->noise_level > 63)
- info->noise_level -= 256;
- info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
- }
- } else {
- if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
- info->signal_level = stats.qual.level;
- info->signal_level_max = range.max_qual.level;
- info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
- }
- if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
- info->noise_level = stats.qual.noise;
- info->noise_level_max = range.max_qual.noise;
- info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
- }
- }
- }
- } else {
- if (!(stats.qual.updated & IW_QUAL_QUAL_INVALID)) {
- info->quality = stats.qual.qual;
- info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
- }
- if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
- info->quality = stats.qual.level;
- info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
- }
- if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
- info->quality = stats.qual.noise;
- info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
+ find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
+ nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
+ &ssid, &ssid_len);
+ if (ssid && ssid_len) {
+ info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
+ snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
}
}
- struct iwreq wrq;
- if (iw_get_ext(skfd, interface, SIOCGIWRATE, &wrq) >= 0)
- info->bitrate = wrq.u.bitrate.value;
+ return NL_SKIP;
+}
+
+static int get_wireless_info(const char *interface, wireless_info_t *info) {
+ memset(info, 0, sizeof(wireless_info_t));
+
+#ifdef LINUX
+ struct nl_sock *sk = nl_socket_alloc();
+ if (genl_connect(sk) != 0)
+ goto error1;
+
+ if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
+ goto error1;
+
+ const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
+ if (nl80211_id < 0)
+ goto error1;
+
+ const unsigned int ifidx = if_nametoindex(interface);
+ if (ifidx == 0)
+ goto error1;
+
+ struct nl_msg *msg = NULL;
+ if ((msg = nlmsg_alloc()) == NULL)
+ goto error1;
- close(skfd);
+ if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
+ nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
+ goto error2;
+
+ if (nl_send_sync(sk, msg) < 0)
+ // nl_send_sync calls nlmsg_free()
+ goto error1;
+ msg = NULL;
+
+ if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
+ goto error1;
+
+ if ((msg = nlmsg_alloc()) == NULL)
+ goto error1;
+
+ if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_STATION, 0) || nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0 || nla_put(msg, NL80211_ATTR_MAC, 6, info->bssid) < 0)
+ goto error2;
+
+ if (nl_send_sync(sk, msg) < 0)
+ // nl_send_sync calls nlmsg_free()
+ goto error1;
+ msg = NULL;
+
+ nl_socket_free(sk);
return 1;
+
+error2:
+ nlmsg_free(msg);
+error1:
+ nl_socket_free(sk);
+ return 0;
+
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__)
int s, inwid;
if (BEGINS_WITH(walk + 1, "bitrate")) {
char br_buffer[128];
- iw_print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
+ print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
outwalk += sprintf(outwalk, "%s", br_buffer);
walk += strlen("bitrate");
projects / i3 / i3status / commitdiff