From: Ashok Raj Nagarajan <[email protected]> This patch allows userspace to set transmit power, in dBm units, to a station associated to the AP.
To set a limit tx power of 20 dBm: iw wlan0 station set <mac-addr> txpwr limit 20 To revert the user defined tx power for a station: iw wlan0 station set <mac-addr> txpwr auto Co-developed-by: Balaji Pothunoori <[email protected]> Signed-off-by: Ashok Raj Nagarajan <[email protected]> Signed-off-by: Balaji Pothunoori <[email protected]> --- v2: tx power set unit modified from mBm to dBm replaced NLA_PUT_U32 with NLA_PUT_U8/U16 station.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/station.c b/station.c index e1477ef..8f6fbc4 100644 --- a/station.c +++ b/station.c @@ -651,6 +651,7 @@ COMMAND(station, del, "<MAC address> [subtype <subtype>] [reason-code <code>]", static const struct cmd *station_set_plink; static const struct cmd *station_set_vlan; static const struct cmd *station_set_mesh_power_mode; +static const struct cmd *station_set_txpwr; static const struct cmd *select_station_cmd(int argc, char **argv) { @@ -662,6 +663,8 @@ static const struct cmd *select_station_cmd(int argc, char **argv) return station_set_vlan; if (strcmp(argv[1], "mesh_power_mode") == 0) return station_set_mesh_power_mode; + if (strcmp(argv[1], "txpwr") == 0) + return station_set_txpwr; return NULL; } @@ -813,6 +816,74 @@ COMMAND_ALIAS(station, set, "<MAC address> mesh_power_mode " "Set link-specific mesh power mode for this station", select_station_cmd, station_set_mesh_power_mode); +static int handle_station_set_txpwr(struct nl80211_state *state, + struct nl_msg *msg, + int argc, char **argv, + enum id_input id) +{ + enum nl80211_tx_power_setting type; + unsigned char mac_addr[ETH_ALEN]; + int sta_txpwr = 0; + char *err = NULL; + + if (argc != 3 && argc != 4) + return 1; + + if (mac_addr_a2n(mac_addr, argv[0])) { + fprintf(stderr, "invalid mac address\n"); + return 2; + } + + NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr); + argc--; + argv++; + + if (strcmp("txpwr", argv[0]) != 0) + return 1; + argc--; + argv++; + + if (!strcmp(argv[0], "auto")) + type = NL80211_TX_POWER_AUTOMATIC; + else if (!strcmp(argv[0], "limit")) + type = NL80211_TX_POWER_LIMITED; + else { + printf("Invalid parameter: %s\n", argv[0]); + return 2; + } + + NLA_PUT_U8(msg, NL80211_ATTR_STA_TX_POWER_SETTING, type); + + if (type != NL80211_TX_POWER_AUTOMATIC) { + if (argc != 2) { + printf("Missing TX power level argument.\n"); + return 2; + } + + argc--; + argv++; + + sta_txpwr = strtoul(argv[0], &err, 0); + + if (sta_txpwr) + NLA_PUT_U16(msg, NL80211_ATTR_STA_TX_POWER, sta_txpwr); + } + + argc--; + argv++; + + if (argc) + return 1; + + return 0; + nla_put_failure: + return -ENOBUFS; +} +COMMAND_ALIAS(station, set, "<MAC address> txpwr <auto|limit> [<tx power dBm>]", + NL80211_CMD_SET_STATION, 0, CIB_NETDEV, handle_station_set_txpwr, + "Set Tx power for this station.", + select_station_cmd, station_set_txpwr); + static int handle_station_dump(struct nl80211_state *state, struct nl_msg *msg, int argc, char **argv, -- 2.7.4
