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/*
* FIXME:
* PROTOTYPE: add nl80211 calls to iw_if. Mostly copied/stolen from iw
*/
#include "wavemon.h"
#include <net/if.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "iw_nl80211.h"
/**
* handle_cmd: process @cmd
* Returns 0 if ok, -errno < 0 on failure
* stolen/modified from iw:iw.c
*/
int handle_cmd(struct cmd *cmd)
{
struct nl_cb *cb;
struct nl_msg *msg;
static int nl80211_id = -1;
int ret;
uint32_t ifindex, idx;
/*
* Initialization of static components:
* - per-cmd socket
* - global nl80211 ID
* - per-cmd interface index (in case conf_ifname() changes)
*/
if (!cmd->sk) {
cmd->sk = nl_socket_alloc();
if (!cmd->sk)
err_sys("failed to allocate netlink socket");
/* NB: not setting sk buffer size, using default 32Kb */
if (genl_connect(cmd->sk))
err_sys("failed to connect to GeNetlink");
}
if (nl80211_id < 0) {
nl80211_id = genl_ctrl_resolve(cmd->sk, "nl80211");
if (nl80211_id < 0)
err_sys("nl80211 not found");
}
ifindex = if_nametoindex(conf_ifname());
if (ifindex == 0 && errno)
err_sys("failed to look up interface %s", conf_ifname());
/*
* Message Preparation
*/
msg = nlmsg_alloc();
if (!msg)
err_sys("failed to allocate netlink message");
cb = nl_cb_alloc(IW_NL_CB_DEBUG ? NL_CB_DEBUG : NL_CB_DEFAULT);
if (!cb)
err_sys("failed to allocate netlink callback");
genlmsg_put(msg, 0, 0, nl80211_id, 0, cmd->flags, cmd->cmd, 0);
/* netdev identifier: interface index */
NLA_PUT(msg, NL80211_ATTR_IFINDEX, sizeof(ifindex), &ifindex);
/* Additional attributes */
if (cmd->msg_args) {
for (idx = 0; idx < cmd->msg_args_len; idx++)
NLA_PUT(msg, cmd->msg_args[idx].type,
cmd->msg_args[idx].len,
cmd->msg_args[idx].data);
}
ret = nl_send_auto_complete(cmd->sk, msg);
if (ret < 0)
err_sys("failed to send netlink message");
/*-------------------------------------------------------------------------
* Receive loop
*-------------------------------------------------------------------------*/
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &ret);
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &ret);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &ret);
if (cmd->handler)
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cmd->handler, cmd->handler_arg);
while (ret > 0)
nl_recvmsgs(cmd->sk, cb);
nl_cb_put(cb);
nlmsg_free(msg);
goto out;
nla_put_failure:
err_quit("failed to add attribute to netlink message");
out:
return ret;
}
/*
* STATION COMMANDS
*/
/* stolen from iw:station.c */
void parse_bitrate(struct nlattr *bitrate_attr, char *buf, int buflen)
{
int rate = 0;
char *pos = buf;
struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
[NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
[NL80211_RATE_INFO_BITRATE32] = { .type = NLA_U32 },
[NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
[NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
[NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
};
if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
bitrate_attr, rate_policy)) {
snprintf(buf, buflen, "failed to parse nested rate attributes!");
return;
}
if (rinfo[NL80211_RATE_INFO_BITRATE32])
rate = nla_get_u32(rinfo[NL80211_RATE_INFO_BITRATE32]);
else if (rinfo[NL80211_RATE_INFO_BITRATE])
rate = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
if (rate > 0)
pos += snprintf(pos, buflen - (pos - buf),
"%d.%d Mbit/s", rate / 10, rate % 10);
if (rinfo[NL80211_RATE_INFO_MCS])
pos += snprintf(pos, buflen - (pos - buf),
" MCS %d", nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]));
if (rinfo[NL80211_RATE_INFO_VHT_MCS])
pos += snprintf(pos, buflen - (pos - buf),
" VHT-MCS %d", nla_get_u8(rinfo[NL80211_RATE_INFO_VHT_MCS]));
if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH])
pos += snprintf(pos, buflen - (pos - buf), " 40MHz");
if (rinfo[NL80211_RATE_INFO_80_MHZ_WIDTH])
pos += snprintf(pos, buflen - (pos - buf), " 80MHz");
if (rinfo[NL80211_RATE_INFO_80P80_MHZ_WIDTH])
pos += snprintf(pos, buflen - (pos - buf), " 80P80MHz");
if (rinfo[NL80211_RATE_INFO_160_MHZ_WIDTH])
pos += snprintf(pos, buflen - (pos - buf), " 160MHz");
if (rinfo[NL80211_RATE_INFO_SHORT_GI])
pos += snprintf(pos, buflen - (pos - buf), " short GI");
if (rinfo[NL80211_RATE_INFO_VHT_NSS])
pos += snprintf(pos, buflen - (pos - buf),
" VHT-NSS %d", nla_get_u8(rinfo[NL80211_RATE_INFO_VHT_NSS]));
}
/*
* INTERFACE COMMANDS
*/
void print_ssid_escaped(char *buf, const size_t buflen,
const uint8_t *data, const size_t datalen)
{
int i, l;
memset(buf, '\0', buflen);
/* Treat zeroed-out SSIDs separately */
for (i = 0; i < datalen && data[i] == '\0'; i++)
;
if (i == datalen)
return;
for (i = l= 0; i < datalen; i++) {
if (l + 4 >= buflen)
return;
else if (isprint(data[i]) && data[i] != ' ' && data[i] != '\\')
l += sprintf(buf + l, "%c", data[i]);
else if (data[i] == ' ' && i != 0 && i != datalen -1)
l += sprintf(buf + l, " ");
else
l += sprintf(buf + l, "\\x%.2x", data[i]);
}
}
/* stolen from iw:interface.c */
static int iface_handler(struct nl_msg *msg, void *arg)
{
struct iw_nl80211_ifstat *ifs = (struct iw_nl80211_ifstat *)arg;
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
assert(ifs != NULL);
nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (tb_msg[NL80211_ATTR_WIPHY])
ifs->phy = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]);
if (tb_msg[NL80211_ATTR_IFINDEX])
ifs->ifindex = nla_get_u32(tb_msg[NL80211_ATTR_IFINDEX]);
if (tb_msg[NL80211_ATTR_WDEV])
ifs->wdev = nla_get_u64(tb_msg[NL80211_ATTR_WDEV]);
if (tb_msg[NL80211_ATTR_SSID])
print_ssid_escaped(ifs->ssid, sizeof(ifs->ssid),
nla_data(tb_msg[NL80211_ATTR_SSID]),
nla_len(tb_msg[NL80211_ATTR_SSID]));
if (tb_msg[NL80211_ATTR_IFTYPE])
ifs->iftype = nla_get_u32(tb_msg[NL80211_ATTR_IFTYPE]);
ifs->chan_width = -1;
ifs->chan_type = -1;
if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
ifs->freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
if (tb_msg[NL80211_ATTR_CHANNEL_WIDTH]) {
ifs->chan_width = nla_get_u32(tb_msg[NL80211_ATTR_CHANNEL_WIDTH]);
if (tb_msg[NL80211_ATTR_CENTER_FREQ1])
ifs->freq_ctr1 = nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ1]);
if (tb_msg[NL80211_ATTR_CENTER_FREQ2])
ifs->freq_ctr2 = nla_get_u32(tb_msg[NL80211_ATTR_CENTER_FREQ2]);
}
if (tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE])
ifs->chan_type = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
}
return NL_SKIP;
}
/**
* survey_handler - channel survey data
* This handler will be called multiple times, for each channel.
* stolen from iw:survey.c
*/
static int survey_handler(struct nl_msg *msg, void *arg)
{
struct iw_nl80211_survey *sd = (struct iw_nl80211_survey *)arg;
struct nlattr *tb[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
[NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
[NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
[NL80211_SURVEY_INFO_IN_USE] = { .type = NLA_FLAG },
[NL80211_SURVEY_INFO_TIME] = { .type = NLA_U64 },
[NL80211_SURVEY_INFO_TIME_BUSY] = { .type = NLA_U64 },
[NL80211_SURVEY_INFO_TIME_EXT_BUSY] = { .type = NLA_U64 },
[NL80211_SURVEY_INFO_TIME_RX] = { .type = NLA_U64 },
[NL80211_SURVEY_INFO_TIME_TX] = { .type = NLA_U64 },
[NL80211_SURVEY_INFO_TIME_SCAN] = { .type = NLA_U64 },
};
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[NL80211_ATTR_SURVEY_INFO])
return NL_SKIP;
if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
tb[NL80211_ATTR_SURVEY_INFO], survey_policy))
return NL_SKIP;
/* The frequency is needed to match up with the associated station */
if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY])
return NL_SKIP;
/* We are only interested in the data of the operating channel */
if (!sinfo[NL80211_SURVEY_INFO_IN_USE])
return NL_SKIP;
sd->freq = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
if (sinfo[NL80211_SURVEY_INFO_NOISE])
sd->noise = (int8_t)nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
if (sinfo[NL80211_SURVEY_INFO_TIME])
sd->time.active = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME]);
if (sinfo[NL80211_SURVEY_INFO_TIME_BUSY])
sd->time.busy = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_BUSY]);
if (sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY])
sd->time.ext_busy = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_EXT_BUSY]);
if (sinfo[NL80211_SURVEY_INFO_TIME_RX])
sd->time.rx = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_RX]);
if (sinfo[NL80211_SURVEY_INFO_TIME_TX])
sd->time.tx = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_TX]);
if (sinfo[NL80211_SURVEY_INFO_TIME_SCAN])
sd->time.scan = nla_get_u64(sinfo[NL80211_SURVEY_INFO_TIME_SCAN]);
return NL_SKIP;
}
/* Regulatory domain, stolen from iw:reg.c */
static int reg_handler(struct nl_msg *msg, void *arg)
{
struct iw_nl80211_reg *ir = (struct iw_nl80211_reg *)arg;
struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
char *alpha2;
ir->region = -1;
nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb_msg[NL80211_ATTR_REG_ALPHA2])
return NL_SKIP;
if (!tb_msg[NL80211_ATTR_REG_RULES])
return NL_SKIP;
if (tb_msg[NL80211_ATTR_DFS_REGION])
ir->region = nla_get_u8(tb_msg[NL80211_ATTR_DFS_REGION]);
else
ir->region = NL80211_DFS_UNSET;
alpha2 = nla_data(tb_msg[NL80211_ATTR_REG_ALPHA2]);
ir->country[0] = alpha2[0];
ir->country[1] = alpha2[1];
return NL_SKIP;
}
static int link_handler(struct nl_msg *msg, void *arg)
{
struct iw_nl80211_linkstat *ls = arg;
struct nlattr *tb[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *bss[NL80211_BSS_MAX + 1];
static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
[NL80211_BSS_TSF] = { .type = NLA_U64 },
[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
[NL80211_BSS_BSSID] = { },
[NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
[NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
[NL80211_BSS_INFORMATION_ELEMENTS] = { },
[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
[NL80211_BSS_STATUS] = { .type = NLA_U32 },
};
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[NL80211_ATTR_BSS])
return NL_SKIP;
if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
return NL_SKIP;
if (!bss[NL80211_BSS_BSSID])
return NL_SKIP;
if (!bss[NL80211_BSS_STATUS])
return NL_SKIP;
if (bss[NL80211_BSS_SIGNAL_UNSPEC])
ls->bss_signal_qual = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
if (bss[NL80211_BSS_SIGNAL_MBM]) {
int s = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
ls->bss_signal = s / 100;
}
ls->status = nla_get_u32(bss[NL80211_BSS_STATUS]);
switch (ls->status) {
case NL80211_BSS_STATUS_ASSOCIATED: /* apparently no longer used */
case NL80211_BSS_STATUS_AUTHENTICATED:
case NL80211_BSS_STATUS_IBSS_JOINED:
memcpy(&ls->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
}
return NL_SKIP;
}
static int link_sta_handler(struct nl_msg *msg, void *arg)
{
struct iw_nl80211_linkstat *ls = arg;
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 *binfo[NL80211_STA_BSS_PARAM_MAX + 1];
struct nl80211_sta_flag_update *sta_flags;
static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
[NL80211_STA_INFO_CONNECTED_TIME] = { .type = NLA_U32 },
[NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
[NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
[NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
[NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
[NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
[NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
[NL80211_STA_INFO_SIGNAL_AVG] = { .type = NLA_U8 },
[NL80211_STA_INFO_T_OFFSET] = { .type = NLA_U64 },
[NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
[NL80211_STA_INFO_RX_BITRATE] = { .type = NLA_NESTED },
[NL80211_STA_INFO_RX_DROP_MISC] = { .type = NLA_U64 },
[NL80211_STA_INFO_BEACON_RX] = { .type = NLA_U64 },
[NL80211_STA_INFO_BEACON_LOSS] = { .type = NLA_U32 },
[NL80211_STA_INFO_BEACON_SIGNAL_AVG] = { .type = NLA_U8 },
[NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
[NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
[NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
[NL80211_STA_INFO_TX_RETRIES] = { .type = NLA_U32 },
[NL80211_STA_INFO_TX_FAILED] = { .type = NLA_U32 },
[NL80211_STA_INFO_STA_FLAGS] =
{ .minlen = sizeof(struct nl80211_sta_flag_update) },
[NL80211_STA_INFO_LOCAL_PM] = { .type = NLA_U32},
[NL80211_STA_INFO_PEER_PM] = { .type = NLA_U32},
[NL80211_STA_INFO_NONPEER_PM] = { .type = NLA_U32},
[NL80211_STA_INFO_CHAIN_SIGNAL] = { .type = NLA_NESTED },
[NL80211_STA_INFO_CHAIN_SIGNAL_AVG] = { .type = NLA_NESTED },
};
static struct nla_policy bss_policy[NL80211_STA_BSS_PARAM_MAX + 1] = {
[NL80211_STA_BSS_PARAM_CTS_PROT] = { .type = NLA_FLAG },
[NL80211_STA_BSS_PARAM_SHORT_PREAMBLE] = { .type = NLA_FLAG },
[NL80211_STA_BSS_PARAM_SHORT_SLOT_TIME] = { .type = NLA_FLAG },
[NL80211_STA_BSS_PARAM_DTIM_PERIOD] = { .type = NLA_U8 },
[NL80211_STA_BSS_PARAM_BEACON_INTERVAL] = { .type = NLA_U16 },
};
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[NL80211_ATTR_STA_INFO])
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_TX_RETRIES])
ls->tx_retries = nla_get_u32(sinfo[NL80211_STA_INFO_TX_RETRIES]);
if (sinfo[NL80211_STA_INFO_TX_FAILED])
ls->tx_failed = nla_get_u32(sinfo[NL80211_STA_INFO_TX_FAILED]);
if (sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]) {
ls->expected_thru = nla_get_u32(sinfo[NL80211_STA_INFO_EXPECTED_THROUGHPUT]);
/* convert in Mbps but scale by 1000 to save kbps units */
ls->expected_thru = ls->expected_thru * 1000 / 1024;
}
if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
ls->inactive_time = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
if (sinfo[NL80211_STA_INFO_CONNECTED_TIME])
ls->connected_time = nla_get_u32(sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
if (sinfo[NL80211_STA_INFO_RX_BYTES])
ls->rx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]);
if (sinfo[NL80211_STA_INFO_RX_PACKETS])
ls->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
if (sinfo[NL80211_STA_INFO_RX_DROP_MISC])
ls->rx_drop_misc = nla_get_u64(sinfo[NL80211_STA_INFO_RX_DROP_MISC]);
if (sinfo[NL80211_STA_INFO_TX_BYTES])
ls->tx_bytes = nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]);
if (sinfo[NL80211_STA_INFO_TX_PACKETS])
ls->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
if (sinfo[NL80211_STA_INFO_SIGNAL])
ls->signal = (int8_t)nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
if (sinfo[NL80211_STA_INFO_SIGNAL_AVG])
ls->signal_avg = (int8_t)nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL_AVG]);
if (sinfo[NL80211_STA_INFO_BEACON_SIGNAL_AVG])
ls->beacon_avg_sig = nla_get_u8(sinfo[NL80211_STA_INFO_BEACON_SIGNAL_AVG]);
if (sinfo[NL80211_STA_INFO_BEACON_RX])
ls->beacons = nla_get_u64(sinfo[NL80211_STA_INFO_BEACON_RX]);
if (sinfo[NL80211_STA_INFO_BEACON_LOSS])
ls->beacon_loss = nla_get_u32(sinfo[NL80211_STA_INFO_BEACON_LOSS]);
if (sinfo[NL80211_STA_INFO_TX_BITRATE])
parse_bitrate(sinfo[NL80211_STA_INFO_TX_BITRATE], ls->tx_bitrate, sizeof(ls->tx_bitrate));
if (sinfo[NL80211_STA_INFO_RX_BITRATE])
parse_bitrate(sinfo[NL80211_STA_INFO_RX_BITRATE], ls->rx_bitrate, sizeof(ls->rx_bitrate));
if (sinfo[NL80211_STA_INFO_STA_FLAGS]) {
sta_flags = (struct nl80211_sta_flag_update *)
nla_data(sinfo[NL80211_STA_INFO_STA_FLAGS]);
if (sta_flags->mask & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) &&
sta_flags->set & BIT(NL80211_STA_FLAG_SHORT_PREAMBLE))
ls->long_preamble = true;
if (sta_flags->mask & BIT(NL80211_STA_FLAG_WME) &&
sta_flags->set & BIT(NL80211_STA_FLAG_WME))
ls->wme = true;
if (sta_flags->mask & BIT(NL80211_STA_FLAG_MFP) &&
sta_flags->set & BIT(NL80211_STA_FLAG_MFP))
ls->mfp = true;
if (sta_flags->mask & BIT(NL80211_STA_FLAG_TDLS_PEER) &&
sta_flags->set & BIT(NL80211_STA_FLAG_TDLS_PEER))
ls->tdls = true;
}
/* BSS Flags */
if (sinfo[NL80211_STA_INFO_BSS_PARAM]) {
if (nla_parse_nested(binfo, NL80211_STA_BSS_PARAM_MAX,
sinfo[NL80211_STA_INFO_BSS_PARAM],
bss_policy) == 0) {
if (binfo[NL80211_STA_BSS_PARAM_CTS_PROT]) {
ls->cts_protection = true;
}
if (binfo[NL80211_STA_BSS_PARAM_SHORT_PREAMBLE])
ls->long_preamble = false;
if (binfo[NL80211_STA_BSS_PARAM_SHORT_SLOT_TIME])
ls->short_slot_time = true;
ls->beacon_int = nla_get_u16(binfo[NL80211_STA_BSS_PARAM_BEACON_INTERVAL]);
ls->dtim_period = nla_get_u8(binfo[NL80211_STA_BSS_PARAM_DTIM_PERIOD]);
}
}
return NL_SKIP;
}
/*
* COMMAND HANDLERS
*/
void iw_nl80211_get_linkstat(struct iw_nl80211_linkstat *ls)
{
static struct cmd cmd_linkstat = {
.cmd = NL80211_CMD_GET_SCAN,
.flags = NLM_F_DUMP,
.handler = link_handler
};
static struct cmd cmd_getstation = {
.cmd = NL80211_CMD_GET_STATION,
.flags = 0,
.handler = link_sta_handler
};
struct msg_attribute station_addr = {
.type = NL80211_ATTR_MAC,
.len = sizeof(ls->bssid),
.data = &ls->bssid
};
cmd_linkstat.handler_arg = ls;
memset(ls, 0, sizeof(*ls));
handle_cmd(&cmd_linkstat);
/* If not associated to another station, the bssid is zeroed out */
if (ether_addr_is_zero(&ls->bssid))
return;
/*
* Details of the associated station
*/
cmd_getstation.handler_arg = ls;
cmd_getstation.msg_args = &station_addr;
cmd_getstation.msg_args_len = 1;
handle_cmd(&cmd_getstation);
/* Channel survey data */
iw_nl80211_get_survey(&ls->survey);
}
void iw_nl80211_getreg(struct iw_nl80211_reg *ir)
{
static struct cmd cmd_reg = {
.cmd = NL80211_CMD_GET_REG,
.flags = 0,
.handler = reg_handler
};
cmd_reg.handler_arg = ir;
memset(ir, 0, sizeof(*ir));
handle_cmd(&cmd_reg);
}
void iw_nl80211_getifstat(struct iw_nl80211_ifstat *ifs)
{
static struct cmd cmd_ifstat = {
.cmd = NL80211_CMD_GET_INTERFACE,
.flags = 0,
.handler = iface_handler
};
cmd_ifstat.handler_arg = ifs;
memset(ifs, 0, sizeof(*ifs));
handle_cmd(&cmd_ifstat);
}
void iw_nl80211_get_survey(struct iw_nl80211_survey *sd)
{
static struct cmd cmd_survey = {
.cmd = NL80211_CMD_GET_SURVEY,
.flags = NLM_F_DUMP,
.handler = survey_handler
};
cmd_survey.handler_arg = sd;
memset(sd, 0, sizeof(*sd));
handle_cmd(&cmd_survey);
}
/*
* Multicast Handling
*/
/**
* struct handler_args - arguments to resolve multicast group
* @group: group name to resolve
* @id: ID it resolves into
*/
struct handler_args {
const char *group;
int id;
};
/* stolen from iw:genl.c */
static int family_handler(struct nl_msg *msg, void *arg)
{
struct handler_args *grp = arg;
struct nlattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *mcgrp;
int rem_mcgrp;
nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[CTRL_ATTR_MCAST_GROUPS])
return NL_SKIP;
nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
nla_data(mcgrp), nla_len(mcgrp), NULL);
if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
continue;
if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
grp->group, nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
continue;
grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
break;
}
return NL_SKIP;
}
/* stolen from iw:genl.c */
int nl_get_multicast_id(struct nl_sock *sock, const char *family, const char *group)
{
struct nl_msg *msg;
struct nl_cb *cb;
int ret, ctrlid;
struct handler_args grp = {
.group = group,
.id = -ENOENT,
};
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb) {
ret = -ENOMEM;
goto out_fail_cb;
}
ctrlid = genl_ctrl_resolve(sock, "nlctrl");
genlmsg_put(msg, 0, 0, ctrlid, 0,
0, CTRL_CMD_GETFAMILY, 0);
ret = -ENOBUFS;
NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);
ret = nl_send_auto_complete(sock, msg);
if (ret < 0)
goto out;
ret = 1;
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &ret);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &ret);
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, family_handler, &grp);
while (ret > 0)
nl_recvmsgs(sock, cb);
if (ret == 0)
ret = grp.id;
nla_put_failure:
out:
nl_cb_put(cb);
out_fail_cb:
nlmsg_free(msg);
return ret;
}
/**
* Allocate a GeNetlink socket ready to listen for nl80211 multicast group @grp
* @grp: identifier of an nl80211 multicast group (e.g. "scan")
*/
struct nl_sock *alloc_nl_mcast_sk(const char *grp)
{
int mcid, ret;
struct nl_sock *sk = nl_socket_alloc();
if (!sk)
err_sys("failed to allocate netlink multicast socket");
if (genl_connect(sk))
err_sys("failed to connect multicast socket to GeNetlink");
mcid = nl_get_multicast_id(sk, "nl80211", grp);
if (mcid < 0)
err_quit("failed to resolve nl80211 '%s' multicast group", grp);
ret = nl_socket_add_membership(sk, mcid);
if (ret)
err_sys("failed to join nl80211 multicast group %s", grp);
return sk;
}
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