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openwrt/package/network/utils/iwinfo/src/iwinfo_nl80211.c

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55 KiB
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/*
* iwinfo - Wireless Information Library - NL80211 Backend
*
* Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
*
* The iwinfo library is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* The iwinfo library 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 the iwinfo library. If not, see http://www.gnu.org/licenses/.
*
* The signal handling code is derived from the official madwifi tools,
* wlanconfig.c in particular. The encryption property handling was
* inspired by the hostapd madwifi driver.
*
* Parts of this code are derived from the Linux iw utility.
*/
#include <limits.h>
#include "iwinfo_nl80211.h"
#define min(x, y) ((x) < (y)) ? (x) : (y)
static struct nl80211_state *nls = NULL;
static void nl80211_close(void)
{
if (nls)
{
if (nls->nlctrl)
genl_family_put(nls->nlctrl);
if (nls->nl80211)
genl_family_put(nls->nl80211);
if (nls->nl_sock)
nl_socket_free(nls->nl_sock);
if (nls->nl_cache)
nl_cache_free(nls->nl_cache);
free(nls);
nls = NULL;
}
}
static int nl80211_init(void)
{
int err, fd;
if (!nls)
{
nls = malloc(sizeof(struct nl80211_state));
if (!nls) {
err = -ENOMEM;
goto err;
}
memset(nls, 0, sizeof(*nls));
nls->nl_sock = nl_socket_alloc();
if (!nls->nl_sock) {
err = -ENOMEM;
goto err;
}
if (genl_connect(nls->nl_sock)) {
err = -ENOLINK;
goto err;
}
fd = nl_socket_get_fd(nls->nl_sock);
if (fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC) < 0) {
err = -EINVAL;
goto err;
}
if (genl_ctrl_alloc_cache(nls->nl_sock, &nls->nl_cache)) {
err = -ENOMEM;
goto err;
}
nls->nl80211 = genl_ctrl_search_by_name(nls->nl_cache, "nl80211");
if (!nls->nl80211) {
err = -ENOENT;
goto err;
}
nls->nlctrl = genl_ctrl_search_by_name(nls->nl_cache, "nlctrl");
if (!nls->nlctrl) {
err = -ENOENT;
goto err;
}
}
return 0;
err:
nl80211_close();
return err;
}
static int nl80211_readint(const char *path)
{
int fd;
int rv = -1;
char buffer[16];
if ((fd = open(path, O_RDONLY)) > -1)
{
if (read(fd, buffer, sizeof(buffer)) > 0)
rv = atoi(buffer);
close(fd);
}
return rv;
}
static int nl80211_msg_error(struct sockaddr_nl *nla,
struct nlmsgerr *err, void *arg)
{
int *ret = arg;
*ret = err->error;
return NL_STOP;
}
static int nl80211_msg_finish(struct nl_msg *msg, void *arg)
{
int *ret = arg;
*ret = 0;
return NL_SKIP;
}
static int nl80211_msg_ack(struct nl_msg *msg, void *arg)
{
int *ret = arg;
*ret = 0;
return NL_STOP;
}
static int nl80211_msg_response(struct nl_msg *msg, void *arg)
{
return NL_SKIP;
}
static void nl80211_free(struct nl80211_msg_conveyor *cv)
{
if (cv)
{
if (cv->cb)
nl_cb_put(cv->cb);
if (cv->msg)
nlmsg_free(cv->msg);
cv->cb = NULL;
cv->msg = NULL;
}
}
static struct nl80211_msg_conveyor * nl80211_new(struct genl_family *family,
int cmd, int flags)
{
static struct nl80211_msg_conveyor cv;
struct nl_msg *req = NULL;
struct nl_cb *cb = NULL;
req = nlmsg_alloc();
if (!req)
goto err;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb)
goto err;
genlmsg_put(req, 0, 0, genl_family_get_id(family), 0, flags, cmd, 0);
cv.msg = req;
cv.cb = cb;
return &cv;
err:
nla_put_failure:
if (cb)
nl_cb_put(cb);
if (req)
nlmsg_free(req);
return NULL;
}
static struct nl80211_msg_conveyor * nl80211_ctl(int cmd, int flags)
{
if (nl80211_init() < 0)
return NULL;
return nl80211_new(nls->nlctrl, cmd, flags);
}
static struct nl80211_msg_conveyor * nl80211_msg(const char *ifname,
int cmd, int flags)
{
int ifidx = -1, phyidx = -1;
struct nl80211_msg_conveyor *cv;
if (ifname == NULL)
return NULL;
if (nl80211_init() < 0)
return NULL;
if (!strncmp(ifname, "phy", 3))
phyidx = atoi(&ifname[3]);
else if (!strncmp(ifname, "radio", 5))
phyidx = atoi(&ifname[5]);
else if (!strncmp(ifname, "mon.", 4))
ifidx = if_nametoindex(&ifname[4]);
else
ifidx = if_nametoindex(ifname);
/* Valid ifidx must be greater than 0 */
if ((ifidx <= 0) && (phyidx < 0))
return NULL;
cv = nl80211_new(nls->nl80211, cmd, flags);
if (!cv)
return NULL;
if (ifidx > -1)
NLA_PUT_U32(cv->msg, NL80211_ATTR_IFINDEX, ifidx);
if (phyidx > -1)
NLA_PUT_U32(cv->msg, NL80211_ATTR_WIPHY, phyidx);
return cv;
nla_put_failure:
nl80211_free(cv);
return NULL;
}
static struct nl80211_msg_conveyor * nl80211_send(
struct nl80211_msg_conveyor *cv,
int (*cb_func)(struct nl_msg *, void *), void *cb_arg
) {
static struct nl80211_msg_conveyor rcv;
int err = 1;
if (cb_func)
nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, cb_func, cb_arg);
else
nl_cb_set(cv->cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_msg_response, &rcv);
if (nl_send_auto_complete(nls->nl_sock, cv->msg) < 0)
goto err;
nl_cb_err(cv->cb, NL_CB_CUSTOM, nl80211_msg_error, &err);
nl_cb_set(cv->cb, NL_CB_FINISH, NL_CB_CUSTOM, nl80211_msg_finish, &err);
nl_cb_set(cv->cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_msg_ack, &err);
while (err > 0)
nl_recvmsgs(nls->nl_sock, cv->cb);
return &rcv;
err:
nl_cb_put(cv->cb);
nlmsg_free(cv->msg);
return NULL;
}
static struct nlattr ** nl80211_parse(struct nl_msg *msg)
{
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
static struct nlattr *attr[NL80211_ATTR_MAX + 1];
nla_parse(attr, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
return attr;
}
static int nl80211_subscribe_cb(struct nl_msg *msg, void *arg)
{
struct nl80211_group_conveyor *cv = arg;
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *mgrpinfo[CTRL_ATTR_MCAST_GRP_MAX + 1];
struct nlattr *mgrp;
int mgrpidx;
if (!attr[CTRL_ATTR_MCAST_GROUPS])
return NL_SKIP;
nla_for_each_nested(mgrp, attr[CTRL_ATTR_MCAST_GROUPS], mgrpidx)
{
nla_parse(mgrpinfo, CTRL_ATTR_MCAST_GRP_MAX,
nla_data(mgrp), nla_len(mgrp), NULL);
if (mgrpinfo[CTRL_ATTR_MCAST_GRP_ID] &&
mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME] &&
!strncmp(nla_data(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME]),
cv->name, nla_len(mgrpinfo[CTRL_ATTR_MCAST_GRP_NAME])))
{
cv->id = nla_get_u32(mgrpinfo[CTRL_ATTR_MCAST_GRP_ID]);
break;
}
}
return NL_SKIP;
}
static int nl80211_subscribe(const char *family, const char *group)
{
struct nl80211_group_conveyor cv = { .name = group, .id = -ENOENT };
struct nl80211_msg_conveyor *req;
req = nl80211_ctl(CTRL_CMD_GETFAMILY, 0);
if (req)
{
NLA_PUT_STRING(req->msg, CTRL_ATTR_FAMILY_NAME, family);
nl80211_send(req, nl80211_subscribe_cb, &cv);
nla_put_failure:
nl80211_free(req);
}
return nl_socket_add_membership(nls->nl_sock, cv.id);
}
static int nl80211_wait_cb(struct nl_msg *msg, void *arg)
{
struct nl80211_event_conveyor *cv = arg;
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
if (gnlh->cmd == cv->wait)
cv->recv = gnlh->cmd;
return NL_SKIP;
}
static int nl80211_wait_seq_check(struct nl_msg *msg, void *arg)
{
return NL_OK;
}
static int nl80211_wait(const char *family, const char *group, int cmd)
{
struct nl80211_event_conveyor cv = { .wait = cmd };
struct nl_cb *cb;
if (nl80211_subscribe(family, group))
return -ENOENT;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb)
return -ENOMEM;
nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl80211_wait_seq_check, NULL);
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, nl80211_wait_cb, &cv );
while (!cv.recv)
nl_recvmsgs(nls->nl_sock, cb);
nl_cb_put(cb);
return 0;
}
static int nl80211_freq2channel(int freq)
{
if (freq == 2484)
return 14;
else if (freq < 2484)
return (freq - 2407) / 5;
else if (freq >= 4910 && freq <= 4980)
return (freq - 4000) / 5;
else
return (freq - 5000) / 5;
}
static int nl80211_channel2freq(int channel, const char *band)
{
if (!band || band[0] != 'a')
{
if (channel == 14)
return 2484;
else if (channel < 14)
return (channel * 5) + 2407;
}
else
{
if (channel >= 182 && channel <= 196)
return (channel * 5) + 4000;
else
return (channel * 5) + 5000;
}
return 0;
}
static char * nl80211_getval(const char *ifname, const char *buf, const char *key)
{
int i, len;
char lkey[64] = { 0 };
const char *ln = buf;
static char lval[256] = { 0 };
int matched_if = ifname ? 0 : 1;
for( i = 0, len = strlen(buf); i < len; i++ )
{
if (!lkey[0] && (buf[i] == ' ' || buf[i] == '\t'))
{
ln++;
}
else if (!lkey[0] && (buf[i] == '='))
{
if ((&buf[i] - ln) > 0)
memcpy(lkey, ln, min(sizeof(lkey) - 1, &buf[i] - ln));
}
else if (buf[i] == '\n')
{
if (lkey[0])
{
memcpy(lval, ln + strlen(lkey) + 1,
min(sizeof(lval) - 1, &buf[i] - ln - strlen(lkey) - 1));
if ((ifname != NULL) &&
(!strcmp(lkey, "interface") || !strcmp(lkey, "bss")) )
{
matched_if = !strcmp(lval, ifname);
}
else if (matched_if && !strcmp(lkey, key))
{
return lval;
}
}
ln = &buf[i+1];
memset(lkey, 0, sizeof(lkey));
memset(lval, 0, sizeof(lval));
}
}
return NULL;
}
static int nl80211_ifname2phy_cb(struct nl_msg *msg, void *arg)
{
char *buf = arg;
struct nlattr **attr = nl80211_parse(msg);
if (attr[NL80211_ATTR_WIPHY_NAME])
memcpy(buf, nla_data(attr[NL80211_ATTR_WIPHY_NAME]),
nla_len(attr[NL80211_ATTR_WIPHY_NAME]));
else
buf[0] = 0;
return NL_SKIP;
}
static char * nl80211_ifname2phy(const char *ifname)
{
static char phy[32] = { 0 };
struct nl80211_msg_conveyor *req;
memset(phy, 0, sizeof(phy));
req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
if (req)
{
nl80211_send(req, nl80211_ifname2phy_cb, phy);
nl80211_free(req);
}
return phy[0] ? phy : NULL;
}
static char * nl80211_phy2ifname(const char *ifname)
{
int fd, ifidx = -1, cifidx = -1, phyidx = -1;
char buffer[64];
static char nif[IFNAMSIZ] = { 0 };
DIR *d;
struct dirent *e;
/* Only accept phy name of the form phy%d or radio%d */
if (!ifname)
return NULL;
else if (!strncmp(ifname, "phy", 3))
phyidx = atoi(&ifname[3]);
else if (!strncmp(ifname, "radio", 5))
phyidx = atoi(&ifname[5]);
else
return NULL;
memset(nif, 0, sizeof(nif));
if (phyidx > -1)
{
if ((d = opendir("/sys/class/net")) != NULL)
{
while ((e = readdir(d)) != NULL)
{
snprintf(buffer, sizeof(buffer),
"/sys/class/net/%s/phy80211/index", e->d_name);
if (nl80211_readint(buffer) == phyidx)
{
snprintf(buffer, sizeof(buffer),
"/sys/class/net/%s/ifindex", e->d_name);
if ((cifidx = nl80211_readint(buffer)) >= 0 &&
((ifidx < 0) || (cifidx < ifidx)))
{
ifidx = cifidx;
strncpy(nif, e->d_name, sizeof(nif));
}
}
}
closedir(d);
}
}
return nif[0] ? nif : NULL;
}
static int nl80211_get_mode_cb(struct nl_msg *msg, void *arg)
{
int *mode = arg;
struct nlattr **tb = nl80211_parse(msg);
const int ifmodes[NL80211_IFTYPE_MAX + 1] = {
IWINFO_OPMODE_UNKNOWN, /* unspecified */
IWINFO_OPMODE_ADHOC, /* IBSS */
IWINFO_OPMODE_CLIENT, /* managed */
IWINFO_OPMODE_MASTER, /* AP */
IWINFO_OPMODE_AP_VLAN, /* AP/VLAN */
IWINFO_OPMODE_WDS, /* WDS */
IWINFO_OPMODE_MONITOR, /* monitor */
IWINFO_OPMODE_MESHPOINT, /* mesh point */
IWINFO_OPMODE_P2P_CLIENT, /* P2P-client */
IWINFO_OPMODE_P2P_GO, /* P2P-GO */
};
if (tb[NL80211_ATTR_IFTYPE])
*mode = ifmodes[nla_get_u32(tb[NL80211_ATTR_IFTYPE])];
return NL_SKIP;
}
static int nl80211_get_mode(const char *ifname, int *buf)
{
char *res;
struct nl80211_msg_conveyor *req;
res = nl80211_phy2ifname(ifname);
req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0);
*buf = IWINFO_OPMODE_UNKNOWN;
if (req)
{
nl80211_send(req, nl80211_get_mode_cb, buf);
nl80211_free(req);
}
return (*buf == IWINFO_OPMODE_UNKNOWN) ? -1 : 0;
}
static char * nl80211_hostapd_info(const char *ifname)
{
int mode;
char *phy;
char path[32] = { 0 };
static char buf[4096] = { 0 };
FILE *conf;
if (nl80211_get_mode(ifname, &mode))
return NULL;
if ((mode == IWINFO_OPMODE_MASTER || mode == IWINFO_OPMODE_AP_VLAN) &&
(phy = nl80211_ifname2phy(ifname)) != NULL)
{
snprintf(path, sizeof(path), "/var/run/hostapd-%s.conf", phy);
if ((conf = fopen(path, "r")) != NULL)
{
fread(buf, sizeof(buf) - 1, 1, conf);
fclose(conf);
return buf;
}
}
return NULL;
}
static inline int nl80211_wpactl_recv(int sock, char *buf, int blen)
{
fd_set rfds;
struct timeval tv = { 2, 0 };
FD_ZERO(&rfds);
FD_SET(sock, &rfds);
memset(buf, 0, blen);
if (select(sock + 1, &rfds, NULL, NULL, &tv) < 0)
return -1;
if (!FD_ISSET(sock, &rfds))
return -1;
return recv(sock, buf, blen, 0);
}
static char * nl80211_wpactl_info(const char *ifname, const char *cmd,
const char *event)
{
int numtry = 0;
int sock = -1;
char *rv = NULL;
size_t remote_length, local_length;
static char buffer[10240] = { 0 };
struct sockaddr_un local = { 0 };
struct sockaddr_un remote = { 0 };
sock = socket(PF_UNIX, SOCK_DGRAM, 0);
if (sock < 0)
return NULL;
remote.sun_family = AF_UNIX;
remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path,
"/var/run/wpa_supplicant-%s/%s", ifname, ifname);
if (fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC) < 0)
goto out;
if (connect(sock, (struct sockaddr *) &remote, remote_length))
{
remote_length = sizeof(remote.sun_family) + sprintf(remote.sun_path,
"/var/run/wpa_supplicant/%s", ifname);
if (connect(sock, (struct sockaddr *) &remote, remote_length))
goto out;
}
local.sun_family = AF_UNIX;
local_length = sizeof(local.sun_family) +
sprintf(local.sun_path, "/var/run/iwinfo-%s-%d", ifname, getpid());
if (bind(sock, (struct sockaddr *) &local, local_length))
goto out;
if (event)
{
send(sock, "ATTACH", 6, 0);
if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)-1) <= 0)
goto out;
}
send(sock, cmd, strlen(cmd), 0);
/* we might have to scan up to 72 channels / 256ms per channel */
/* this makes up to 18.5s hence 10 tries */
while( numtry++ < 10 )
{
char *bracket;
/* make sure there is a terminating nul byte */
if (nl80211_wpactl_recv(sock, buffer, sizeof(buffer)-1) <= 0)
{
if (event)
continue;
break;
}
if ((!event && buffer[0] != '<') || (event && strstr(buffer, event)))
break;
/* there may be more than max(numtry) BSS-ADDED events */
/* ignore them similar to wpa_cli */
if (buffer[0] == '<' &&
(bracket=strchr(buffer,'>')) != NULL &&
strncmp(bracket+1,"CTRL-EVENT-BSS-ADDED",20) == 0)
numtry--;
}
rv = buffer;
out:
close(sock);
if (local.sun_family)
unlink(local.sun_path);
return rv;
}
static char * nl80211_ifadd(const char *ifname)
{
int phyidx;
char *rv = NULL, path[PATH_MAX];
static char nif[IFNAMSIZ] = { 0 };
struct nl80211_msg_conveyor *req, *res;
FILE *sysfs;
req = nl80211_msg(ifname, NL80211_CMD_NEW_INTERFACE, 0);
if (req)
{
snprintf(nif, sizeof(nif), "tmp.%s", ifname);
NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, nif);
NLA_PUT_U32(req->msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION);
nl80211_send(req, NULL, NULL);
snprintf(path, sizeof(path) - 1,
"/proc/sys/net/ipv6/conf/%s/disable_ipv6", nif);
if ((sysfs = fopen(path, "w")) != NULL)
{
fwrite("0\n", 1, 2, sysfs);
fclose(sysfs);
}
rv = nif;
nla_put_failure:
nl80211_free(req);
}
return rv;
}
static void nl80211_ifdel(const char *ifname)
{
struct nl80211_msg_conveyor *req;
req = nl80211_msg(ifname, NL80211_CMD_DEL_INTERFACE, 0);
if (req)
{
NLA_PUT_STRING(req->msg, NL80211_ATTR_IFNAME, ifname);
nl80211_send(req, NULL, NULL);
nla_put_failure:
nl80211_free(req);
}
}
static void nl80211_hostapd_hup(const char *ifname)
{
int fd, pid = 0;
char buf[32];
char *phy = nl80211_ifname2phy(ifname);
if (phy)
{
snprintf(buf, sizeof(buf), "/var/run/wifi-%s.pid", phy);
if ((fd = open(buf, O_RDONLY)) > 0)
{
if (read(fd, buf, sizeof(buf)) > 0)
pid = atoi(buf);
close(fd);
}
if (pid > 0)
kill(pid, 1);
}
}
static int nl80211_probe(const char *ifname)
{
return !!nl80211_ifname2phy(ifname);
}
struct nl80211_ssid_bssid {
unsigned char *ssid;
unsigned char bssid[7];
};
static int nl80211_get_ssid_bssid_cb(struct nl_msg *msg, void *arg)
{
int ielen;
unsigned char *ie;
struct nl80211_ssid_bssid *sb = arg;
struct nlattr **tb = nl80211_parse(msg);
struct nlattr *bss[NL80211_BSS_MAX + 1];
static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
[NL80211_BSS_INFORMATION_ELEMENTS] = { },
[NL80211_BSS_STATUS] = { .type = NLA_U32 },
};
if (!tb[NL80211_ATTR_BSS] ||
nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
bss_policy) ||
!bss[NL80211_BSS_BSSID] ||
!bss[NL80211_BSS_STATUS] ||
!bss[NL80211_BSS_INFORMATION_ELEMENTS])
{
return NL_SKIP;
}
switch (nla_get_u32(bss[NL80211_BSS_STATUS]))
{
case NL80211_BSS_STATUS_ASSOCIATED:
case NL80211_BSS_STATUS_AUTHENTICATED:
case NL80211_BSS_STATUS_IBSS_JOINED:
if (sb->ssid)
{
ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
while (ielen >= 2 && ielen >= ie[1])
{
if (ie[0] == 0)
{
memcpy(sb->ssid, ie + 2, min(ie[1], IWINFO_ESSID_MAX_SIZE));
return NL_SKIP;
}
ielen -= ie[1] + 2;
ie += ie[1] + 2;
}
}
else
{
sb->bssid[0] = 1;
memcpy(sb->bssid + 1, nla_data(bss[NL80211_BSS_BSSID]), 6);
return NL_SKIP;
}
default:
return NL_SKIP;
}
}
static int nl80211_get_ssid(const char *ifname, char *buf)
{
char *res;
struct nl80211_msg_conveyor *req;
struct nl80211_ssid_bssid sb;
/* try to find ssid from scan dump results */
res = nl80211_phy2ifname(ifname);
req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP);
sb.ssid = buf;
*buf = 0;
if (req)
{
nl80211_send(req, nl80211_get_ssid_bssid_cb, &sb);
nl80211_free(req);
}
/* failed, try to find from hostapd info */
if ((*buf == 0) &&
(res = nl80211_hostapd_info(ifname)) &&
(res = nl80211_getval(ifname, res, "ssid")))
{
memcpy(buf, res, strlen(res));
}
return (*buf == 0) ? -1 : 0;
}
static int nl80211_get_bssid(const char *ifname, char *buf)
{
char *res;
struct nl80211_msg_conveyor *req;
struct nl80211_ssid_bssid sb;
/* try to find bssid from scan dump results */
res = nl80211_phy2ifname(ifname);
req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP);
sb.ssid = NULL;
sb.bssid[0] = 0;
if (req)
{
nl80211_send(req, nl80211_get_ssid_bssid_cb, &sb);
nl80211_free(req);
}
/* failed, try to find mac from hostapd info */
if ((sb.bssid[0] == 0) &&
(res = nl80211_hostapd_info(ifname)) &&
(res = nl80211_getval(ifname, res, "bssid")))
{
sb.bssid[0] = 1;
sb.bssid[1] = strtol(&res[0], NULL, 16);
sb.bssid[2] = strtol(&res[3], NULL, 16);
sb.bssid[3] = strtol(&res[6], NULL, 16);
sb.bssid[4] = strtol(&res[9], NULL, 16);
sb.bssid[5] = strtol(&res[12], NULL, 16);
sb.bssid[6] = strtol(&res[15], NULL, 16);
}
if (sb.bssid[0])
{
sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
sb.bssid[1], sb.bssid[2], sb.bssid[3],
sb.bssid[4], sb.bssid[5], sb.bssid[6]);
return 0;
}
return -1;
}
static int nl80211_get_frequency_scan_cb(struct nl_msg *msg, void *arg)
{
int *freq = arg;
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *binfo[NL80211_BSS_MAX + 1];
static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
[NL80211_BSS_STATUS] = { .type = NLA_U32 },
};
if (attr[NL80211_ATTR_BSS] &&
!nla_parse_nested(binfo, NL80211_BSS_MAX,
attr[NL80211_ATTR_BSS], bss_policy))
{
if (binfo[NL80211_BSS_STATUS] && binfo[NL80211_BSS_FREQUENCY])
*freq = nla_get_u32(binfo[NL80211_BSS_FREQUENCY]);
}
return NL_SKIP;
}
static int nl80211_get_frequency_info_cb(struct nl_msg *msg, void *arg)
{
int *freq = arg;
struct nlattr **tb = nl80211_parse(msg);
if (tb[NL80211_ATTR_WIPHY_FREQ])
*freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
return NL_SKIP;
}
static int nl80211_get_frequency(const char *ifname, int *buf)
{
int chn;
char *res, *channel;
struct nl80211_msg_conveyor *req;
/* try to find frequency from interface info */
res = nl80211_phy2ifname(ifname);
req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_INTERFACE, 0);
*buf = 0;
if (req)
{
nl80211_send(req, nl80211_get_frequency_info_cb, buf);
nl80211_free(req);
}
/* failed, try to find frequency from hostapd info */
if ((*buf == 0) &&
(res = nl80211_hostapd_info(ifname)) &&
(channel = nl80211_getval(NULL, res, "channel")))
{
chn = atoi(channel);
*buf = nl80211_channel2freq(chn, nl80211_getval(NULL, res, "hw_mode"));
}
else
{
/* failed, try to find frequency from scan results */
if (*buf == 0)
{
res = nl80211_phy2ifname(ifname);
req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN,
NLM_F_DUMP);
if (req)
{
nl80211_send(req, nl80211_get_frequency_scan_cb, buf);
nl80211_free(req);
}
}
}
return (*buf == 0) ? -1 : 0;
}
static int nl80211_get_channel(const char *ifname, int *buf)
{
if (!nl80211_get_frequency(ifname, buf))
{
*buf = nl80211_freq2channel(*buf);
return 0;
}
return -1;
}
static int nl80211_get_txpower(const char *ifname, int *buf)
{
#if 0
char *res;
char path[PATH_MAX];
res = nl80211_ifname2phy(ifname);
snprintf(path, sizeof(path), "/sys/kernel/debug/ieee80211/%s/power",
res ? res : ifname);
if ((*buf = nl80211_readint(path)) > -1)
return 0;
#endif
return wext_ops.txpower(ifname, buf);
}
static int nl80211_fill_signal_cb(struct nl_msg *msg, void *arg)
{
int8_t dbm;
int16_t mbit;
struct nl80211_rssi_rate *rr = arg;
struct nlattr **attr = nl80211_parse(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_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_TX_BITRATE] = { .type = NLA_NESTED },
[NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
[NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
[NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
};
static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
[NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
[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 (attr[NL80211_ATTR_STA_INFO])
{
if (!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
attr[NL80211_ATTR_STA_INFO], stats_policy))
{
if (sinfo[NL80211_STA_INFO_SIGNAL])
{
dbm = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
rr->rssi = rr->rssi ? (int8_t)((rr->rssi + dbm) / 2) : dbm;
}
if (sinfo[NL80211_STA_INFO_TX_BITRATE])
{
if (!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
sinfo[NL80211_STA_INFO_TX_BITRATE],
rate_policy))
{
if (rinfo[NL80211_RATE_INFO_BITRATE])
{
mbit = nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]);
rr->rate = rr->rate
? (int16_t)((rr->rate + mbit) / 2) : mbit;
}
}
}
}
}
return NL_SKIP;
}
static void nl80211_fill_signal(const char *ifname, struct nl80211_rssi_rate *r)
{
DIR *d;
struct dirent *de;
struct nl80211_msg_conveyor *req;
r->rssi = 0;
r->rate = 0;
if ((d = opendir("/sys/class/net")) != NULL)
{
while ((de = readdir(d)) != NULL)
{
if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
(!de->d_name[strlen(ifname)] ||
!strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
{
req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION,
NLM_F_DUMP);
if (req)
{
nl80211_send(req, nl80211_fill_signal_cb, r);
nl80211_free(req);
}
}
}
closedir(d);
}
}
static int nl80211_get_bitrate(const char *ifname, int *buf)
{
struct nl80211_rssi_rate rr;
nl80211_fill_signal(ifname, &rr);
if (rr.rate)
{
*buf = (rr.rate * 100);
return 0;
}
return -1;
}
static int nl80211_get_signal(const char *ifname, int *buf)
{
struct nl80211_rssi_rate rr;
nl80211_fill_signal(ifname, &rr);
if (rr.rssi)
{
*buf = rr.rssi;
return 0;
}
return -1;
}
static int nl80211_get_noise_cb(struct nl_msg *msg, void *arg)
{
int8_t *noise = arg;
struct nlattr **tb = nl80211_parse(msg);
struct nlattr *si[NL80211_SURVEY_INFO_MAX + 1];
static struct nla_policy sp[NL80211_SURVEY_INFO_MAX + 1] = {
[NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
[NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
};
if (!tb[NL80211_ATTR_SURVEY_INFO])
return NL_SKIP;
if (nla_parse_nested(si, NL80211_SURVEY_INFO_MAX,
tb[NL80211_ATTR_SURVEY_INFO], sp))
return NL_SKIP;
if (!si[NL80211_SURVEY_INFO_NOISE])
return NL_SKIP;
if (!*noise || si[NL80211_SURVEY_INFO_IN_USE])
*noise = (int8_t)nla_get_u8(si[NL80211_SURVEY_INFO_NOISE]);
return NL_SKIP;
}
static int nl80211_get_noise(const char *ifname, int *buf)
{
int8_t noise;
struct nl80211_msg_conveyor *req;
req = nl80211_msg(ifname, NL80211_CMD_GET_SURVEY, NLM_F_DUMP);
if (req)
{
noise = 0;
nl80211_send(req, nl80211_get_noise_cb, &noise);
nl80211_free(req);
if (noise)
{
*buf = noise;
return 0;
}
}
return -1;
}
static int nl80211_get_quality(const char *ifname, int *buf)
{
int signal;
if (!nl80211_get_signal(ifname, &signal))
{
/* A positive signal level is usually just a quality
* value, pass through as-is */
if (signal >= 0)
{
*buf = signal;
}
/* The cfg80211 wext compat layer assumes a signal range
* of -110 dBm to -40 dBm, the quality value is derived
* by adding 110 to the signal level */
else
{
if (signal < -110)
signal = -110;
else if (signal > -40)
signal = -40;
*buf = (signal + 110);
}
return 0;
}
return -1;
}
static int nl80211_get_quality_max(const char *ifname, int *buf)
{
/* The cfg80211 wext compat layer assumes a maximum
* quality of 70 */
*buf = 70;
return 0;
}
static int nl80211_get_encryption(const char *ifname, char *buf)
{
int i;
char k[9];
char *val, *res;
struct iwinfo_crypto_entry *c = (struct iwinfo_crypto_entry *)buf;
/* WPA supplicant */
if ((res = nl80211_wpactl_info(ifname, "STATUS", NULL)) &&
(val = nl80211_getval(NULL, res, "pairwise_cipher")))
{
/* WEP */
if (strstr(val, "WEP"))
{
if (strstr(val, "WEP-40"))
c->pair_ciphers |= IWINFO_CIPHER_WEP40;
else if (strstr(val, "WEP-104"))
c->pair_ciphers |= IWINFO_CIPHER_WEP104;
c->enabled = 1;
c->group_ciphers = c->pair_ciphers;
c->auth_suites |= IWINFO_KMGMT_NONE;
c->auth_algs |= IWINFO_AUTH_OPEN; /* XXX: assumption */
}
/* WPA */
else
{
if (strstr(val, "TKIP"))
c->pair_ciphers |= IWINFO_CIPHER_TKIP;
else if (strstr(val, "CCMP"))
c->pair_ciphers |= IWINFO_CIPHER_CCMP;
else if (strstr(val, "NONE"))
c->pair_ciphers |= IWINFO_CIPHER_NONE;
else if (strstr(val, "WEP-40"))
c->pair_ciphers |= IWINFO_CIPHER_WEP40;
else if (strstr(val, "WEP-104"))
c->pair_ciphers |= IWINFO_CIPHER_WEP104;
if ((val = nl80211_getval(NULL, res, "group_cipher")))
{
if (strstr(val, "TKIP"))
c->group_ciphers |= IWINFO_CIPHER_TKIP;
else if (strstr(val, "CCMP"))
c->group_ciphers |= IWINFO_CIPHER_CCMP;
else if (strstr(val, "NONE"))
c->group_ciphers |= IWINFO_CIPHER_NONE;
else if (strstr(val, "WEP-40"))
c->group_ciphers |= IWINFO_CIPHER_WEP40;
else if (strstr(val, "WEP-104"))
c->group_ciphers |= IWINFO_CIPHER_WEP104;
}
if ((val = nl80211_getval(NULL, res, "key_mgmt")))
{
if (strstr(val, "WPA2"))
c->wpa_version = 2;
else if (strstr(val, "WPA"))
c->wpa_version = 1;
if (strstr(val, "PSK"))
c->auth_suites |= IWINFO_KMGMT_PSK;
else if (strstr(val, "EAP") || strstr(val, "802.1X"))
c->auth_suites |= IWINFO_KMGMT_8021x;
else if (strstr(val, "NONE"))
c->auth_suites |= IWINFO_KMGMT_NONE;
}
c->enabled = (c->wpa_version && c->auth_suites) ? 1 : 0;
}
return 0;
}
/* Hostapd */
else if ((res = nl80211_hostapd_info(ifname)))
{
if ((val = nl80211_getval(ifname, res, "wpa")) != NULL)
c->wpa_version = atoi(val);
val = nl80211_getval(ifname, res, "wpa_key_mgmt");
if (!val || strstr(val, "PSK"))
c->auth_suites |= IWINFO_KMGMT_PSK;
if (val && strstr(val, "EAP"))
c->auth_suites |= IWINFO_KMGMT_8021x;
if (val && strstr(val, "NONE"))
c->auth_suites |= IWINFO_KMGMT_NONE;
if ((val = nl80211_getval(ifname, res, "wpa_pairwise")) != NULL)
{
if (strstr(val, "TKIP"))
c->pair_ciphers |= IWINFO_CIPHER_TKIP;
if (strstr(val, "CCMP"))
c->pair_ciphers |= IWINFO_CIPHER_CCMP;
if (strstr(val, "NONE"))
c->pair_ciphers |= IWINFO_CIPHER_NONE;
}
if ((val = nl80211_getval(ifname, res, "auth_algs")) != NULL)
{
switch(atoi(val)) {
case 1:
c->auth_algs |= IWINFO_AUTH_OPEN;
break;
case 2:
c->auth_algs |= IWINFO_AUTH_SHARED;
break;
case 3:
c->auth_algs |= IWINFO_AUTH_OPEN;
c->auth_algs |= IWINFO_AUTH_SHARED;
break;
default:
break;
}
for (i = 0; i < 4; i++)
{
snprintf(k, sizeof(k), "wep_key%d", i);
if ((val = nl80211_getval(ifname, res, k)))
{
if ((strlen(val) == 5) || (strlen(val) == 10))
c->pair_ciphers |= IWINFO_CIPHER_WEP40;
else if ((strlen(val) == 13) || (strlen(val) == 26))
c->pair_ciphers |= IWINFO_CIPHER_WEP104;
}
}
}
c->group_ciphers = c->pair_ciphers;
c->enabled = (c->wpa_version || c->pair_ciphers) ? 1 : 0;
return 0;
}
return -1;
}
static int nl80211_get_phyname(const char *ifname, char *buf)
{
const char *name;
name = nl80211_ifname2phy(ifname);
if (name)
{
strcpy(buf, name);
return 0;
}
else if ((name = nl80211_phy2ifname(ifname)) != NULL)
{
name = nl80211_ifname2phy(name);
if (name)
{
strcpy(buf, ifname);
return 0;
}
}
return -1;
}
static int nl80211_get_assoclist_cb(struct nl_msg *msg, void *arg)
{
struct nl80211_array_buf *arr = arg;
struct iwinfo_assoclist_entry *e = arr->buf;
struct nlattr **attr = nl80211_parse(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_INACTIVE_TIME] = { .type = NLA_U32 },
[NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
[NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
[NL80211_STA_INFO_RX_BITRATE] = { .type = NLA_NESTED },
[NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
[NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
};
static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
[NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
[NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
[NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
[NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
};
/* advance to end of array */
e += arr->count;
memset(e, 0, sizeof(*e));
if (attr[NL80211_ATTR_MAC])
memcpy(e->mac, nla_data(attr[NL80211_ATTR_MAC]), 6);
if (attr[NL80211_ATTR_STA_INFO] &&
!nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
attr[NL80211_ATTR_STA_INFO], stats_policy))
{
if (sinfo[NL80211_STA_INFO_SIGNAL])
e->signal = nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
if (sinfo[NL80211_STA_INFO_INACTIVE_TIME])
e->inactive = nla_get_u32(sinfo[NL80211_STA_INFO_INACTIVE_TIME]);
if (sinfo[NL80211_STA_INFO_RX_PACKETS])
e->rx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS]);
if (sinfo[NL80211_STA_INFO_TX_PACKETS])
e->tx_packets = nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS]);
if (sinfo[NL80211_STA_INFO_RX_BITRATE] &&
!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
{
if (rinfo[NL80211_RATE_INFO_BITRATE])
e->rx_rate.rate =
nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100;
if (rinfo[NL80211_RATE_INFO_MCS])
e->rx_rate.mcs = nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]);
if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH])
e->rx_rate.is_40mhz = 1;
if (rinfo[NL80211_RATE_INFO_SHORT_GI])
e->rx_rate.is_short_gi = 1;
}
if (sinfo[NL80211_STA_INFO_TX_BITRATE] &&
!nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX,
sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy))
{
if (rinfo[NL80211_RATE_INFO_BITRATE])
e->tx_rate.rate =
nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100;
if (rinfo[NL80211_RATE_INFO_MCS])
e->tx_rate.mcs = nla_get_u8(rinfo[NL80211_RATE_INFO_MCS]);
if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH])
e->tx_rate.is_40mhz = 1;
if (rinfo[NL80211_RATE_INFO_SHORT_GI])
e->tx_rate.is_short_gi = 1;
}
}
e->noise = 0; /* filled in by caller */
arr->count++;
return NL_SKIP;
}
static int nl80211_get_assoclist(const char *ifname, char *buf, int *len)
{
DIR *d;
int i, noise = 0;
struct dirent *de;
struct nl80211_msg_conveyor *req;
struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
struct iwinfo_assoclist_entry *e;
if ((d = opendir("/sys/class/net")) != NULL)
{
while ((de = readdir(d)) != NULL)
{
if (!strncmp(de->d_name, ifname, strlen(ifname)) &&
(!de->d_name[strlen(ifname)] ||
!strncmp(&de->d_name[strlen(ifname)], ".sta", 4)))
{
req = nl80211_msg(de->d_name, NL80211_CMD_GET_STATION,
NLM_F_DUMP);
if (req)
{
nl80211_send(req, nl80211_get_assoclist_cb, &arr);
nl80211_free(req);
}
}
}
closedir(d);
if (!nl80211_get_noise(ifname, &noise))
for (i = 0, e = arr.buf; i < arr.count; i++, e++)
e->noise = noise;
*len = (arr.count * sizeof(struct iwinfo_assoclist_entry));
return 0;
}
return -1;
}
static int nl80211_get_txpwrlist_cb(struct nl_msg *msg, void *arg)
{
int *dbm_max = arg;
int ch_cur, ch_cmp, bands_remain, freqs_remain;
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
struct nlattr *band, *freq;
static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
[NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
[NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
};
ch_cur = *dbm_max; /* value int* is initialized with channel by caller */
*dbm_max = -1;
nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
{
nla_parse(bands, NL80211_BAND_ATTR_MAX, nla_data(band),
nla_len(band), NULL);
nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
{
nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
nla_data(freq), nla_len(freq), freq_policy);
ch_cmp = nl80211_freq2channel(nla_get_u32(
freqs[NL80211_FREQUENCY_ATTR_FREQ]));
if ((!ch_cur || (ch_cmp == ch_cur)) &&
freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER])
{
*dbm_max = (int)(0.01 * nla_get_u32(
freqs[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]));
break;
}
}
}
return NL_SKIP;
}
static int nl80211_get_txpwrlist(const char *ifname, char *buf, int *len)
{
int ch_cur;
int dbm_max = -1, dbm_cur, dbm_cnt;
struct nl80211_msg_conveyor *req;
struct iwinfo_txpwrlist_entry entry;
if (nl80211_get_channel(ifname, &ch_cur))
ch_cur = 0;
req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
if (req)
{
/* initialize the value pointer with channel for callback */
dbm_max = ch_cur;
nl80211_send(req, nl80211_get_txpwrlist_cb, &dbm_max);
nl80211_free(req);
}
if (dbm_max > 0)
{
for (dbm_cur = 0, dbm_cnt = 0;
dbm_cur < dbm_max;
dbm_cur++, dbm_cnt++)
{
entry.dbm = dbm_cur;
entry.mw = iwinfo_dbm2mw(dbm_cur);
memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
}
entry.dbm = dbm_max;
entry.mw = iwinfo_dbm2mw(dbm_max);
memcpy(&buf[dbm_cnt * sizeof(entry)], &entry, sizeof(entry));
dbm_cnt++;
*len = dbm_cnt * sizeof(entry);
return 0;
}
return -1;
}
static void nl80211_get_scancrypto(const char *spec,
struct iwinfo_crypto_entry *c)
{
if (strstr(spec, "WPA") || strstr(spec, "WEP"))
{
c->enabled = 1;
if (strstr(spec, "WPA2-") && strstr(spec, "WPA-"))
c->wpa_version = 3;
else if (strstr(spec, "WPA2"))
c->wpa_version = 2;
else if (strstr(spec, "WPA"))
c->wpa_version = 1;
else if (strstr(spec, "WEP"))
c->auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
if (strstr(spec, "PSK"))
c->auth_suites |= IWINFO_KMGMT_PSK;
if (strstr(spec, "802.1X") || strstr(spec, "EAP"))
c->auth_suites |= IWINFO_KMGMT_8021x;
if (strstr(spec, "WPA-NONE"))
c->auth_suites |= IWINFO_KMGMT_NONE;
if (strstr(spec, "TKIP"))
c->pair_ciphers |= IWINFO_CIPHER_TKIP;
if (strstr(spec, "CCMP"))
c->pair_ciphers |= IWINFO_CIPHER_CCMP;
if (strstr(spec, "WEP-40"))
c->pair_ciphers |= IWINFO_CIPHER_WEP40;
if (strstr(spec, "WEP-104"))
c->pair_ciphers |= IWINFO_CIPHER_WEP104;
c->group_ciphers = c->pair_ciphers;
}
else
{
c->enabled = 0;
}
}
struct nl80211_scanlist {
struct iwinfo_scanlist_entry *e;
int len;
};
static void nl80211_get_scanlist_ie(struct nlattr **bss,
struct iwinfo_scanlist_entry *e)
{
int ielen = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
unsigned char *ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
static unsigned char ms_oui[3] = { 0x00, 0x50, 0xf2 };
int len;
while (ielen >= 2 && ielen >= ie[1])
{
switch (ie[0])
{
case 0: /* SSID */
len = min(ie[1], IWINFO_ESSID_MAX_SIZE);
memcpy(e->ssid, ie + 2, len);
e->ssid[len] = 0;
break;
case 48: /* RSN */
iwinfo_parse_rsn(&e->crypto, ie + 2, ie[1],
IWINFO_CIPHER_CCMP, IWINFO_KMGMT_8021x);
break;
case 221: /* Vendor */
if (ie[1] >= 4 && !memcmp(ie + 2, ms_oui, 3) && ie[5] == 1)
iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
break;
}
ielen -= ie[1] + 2;
ie += ie[1] + 2;
}
}
static int nl80211_get_scanlist_cb(struct nl_msg *msg, void *arg)
{
int8_t rssi;
uint16_t caps;
struct nl80211_scanlist *sl = arg;
struct nlattr **tb = nl80211_parse(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 },
[NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
[NL80211_BSS_BEACON_IES] = { },
};
if (!tb[NL80211_ATTR_BSS] ||
nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
bss_policy) ||
!bss[NL80211_BSS_BSSID])
{
return NL_SKIP;
}
if (bss[NL80211_BSS_CAPABILITY])
caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
else
caps = 0;
memset(sl->e, 0, sizeof(*sl->e));
memcpy(sl->e->mac, nla_data(bss[NL80211_BSS_BSSID]), 6);
if (caps & (1<<1))
sl->e->mode = IWINFO_OPMODE_ADHOC;
else if (caps & (1<<0))
sl->e->mode = IWINFO_OPMODE_MASTER;
else
sl->e->mode = IWINFO_OPMODE_MESHPOINT;
if (caps & (1<<4))
sl->e->crypto.enabled = 1;
if (bss[NL80211_BSS_FREQUENCY])
sl->e->channel = nl80211_freq2channel(nla_get_u32(
bss[NL80211_BSS_FREQUENCY]));
if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
nl80211_get_scanlist_ie(bss, sl->e);
if (bss[NL80211_BSS_SIGNAL_MBM])
{
sl->e->signal =
(uint8_t)((int32_t)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100);
rssi = sl->e->signal - 0x100;
if (rssi < -110)
rssi = -110;
else if (rssi > -40)
rssi = -40;
sl->e->quality = (rssi + 110);
sl->e->quality_max = 70;
}
if (sl->e->crypto.enabled && !sl->e->crypto.wpa_version)
{
sl->e->crypto.auth_algs = IWINFO_AUTH_OPEN | IWINFO_AUTH_SHARED;
sl->e->crypto.pair_ciphers = IWINFO_CIPHER_WEP40 | IWINFO_CIPHER_WEP104;
}
sl->e++;
sl->len++;
return NL_SKIP;
}
static int nl80211_get_scanlist_nl(const char *ifname, char *buf, int *len)
{
struct nl80211_msg_conveyor *req;
struct nl80211_scanlist sl = { .e = (struct iwinfo_scanlist_entry *)buf };
req = nl80211_msg(ifname, NL80211_CMD_TRIGGER_SCAN, 0);
if (req)
{
nl80211_send(req, NULL, NULL);
nl80211_free(req);
}
nl80211_wait("nl80211", "scan", NL80211_CMD_NEW_SCAN_RESULTS);
req = nl80211_msg(ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP);
if (req)
{
nl80211_send(req, nl80211_get_scanlist_cb, &sl);
nl80211_free(req);
}
*len = sl.len * sizeof(struct iwinfo_scanlist_entry);
return *len ? 0 : -1;
}
static int nl80211_get_scanlist(const char *ifname, char *buf, int *len)
{
int freq, rssi, qmax, count, mode;
char *res;
char ssid[128] = { 0 };
char bssid[18] = { 0 };
char cipher[256] = { 0 };
/* Got a radioX pseudo interface, find some interface on it or create one */
if (!strncmp(ifname, "radio", 5))
{
/* Reuse existing interface */
if ((res = nl80211_phy2ifname(ifname)) != NULL)
{
return nl80211_get_scanlist(res, buf, len);
}
/* Need to spawn a temporary iface for scanning */
else if ((res = nl80211_ifadd(ifname)) != NULL)
{
count = nl80211_get_scanlist(res, buf, len);
nl80211_ifdel(res);
return count;
}
}
struct iwinfo_scanlist_entry *e = (struct iwinfo_scanlist_entry *)buf;
/* WPA supplicant */
if ((res = nl80211_wpactl_info(ifname, "SCAN", "CTRL-EVENT-SCAN-RESULTS")))
{
if ((res = nl80211_wpactl_info(ifname, "SCAN_RESULTS", NULL)))
{
nl80211_get_quality_max(ifname, &qmax);
count = -1;
do {
if (res[0] == '<')
{
/* skip log lines */
goto nextline;
}
if (count < 0)
{
/* skip header line */
count++;
goto nextline;
}
if (sscanf(res, "%17s %d %d %255s%*[ \t]%127[^\n]\n",
bssid, &freq, &rssi, cipher, ssid) < 5)
{
/* skip malformed lines */
goto nextline;
}
/* BSSID */
e->mac[0] = strtol(&bssid[0], NULL, 16);
e->mac[1] = strtol(&bssid[3], NULL, 16);
e->mac[2] = strtol(&bssid[6], NULL, 16);
e->mac[3] = strtol(&bssid[9], NULL, 16);
e->mac[4] = strtol(&bssid[12], NULL, 16);
e->mac[5] = strtol(&bssid[15], NULL, 16);
/* SSID */
memcpy(e->ssid, ssid, min(strlen(ssid), sizeof(e->ssid) - 1));
/* Mode (assume master) */
if (strstr(cipher,"[MESH]"))
e->mode = IWINFO_OPMODE_MESHPOINT;
else
e->mode = IWINFO_OPMODE_MASTER;
/* Channel */
e->channel = nl80211_freq2channel(freq);
/* Signal */
e->signal = rssi;
/* Quality */
if (rssi < 0)
{
/* The cfg80211 wext compat layer assumes a signal range
* of -110 dBm to -40 dBm, the quality value is derived
* by adding 110 to the signal level */
if (rssi < -110)
rssi = -110;
else if (rssi > -40)
rssi = -40;
e->quality = (rssi + 110);
}
else
{
e->quality = rssi;
}
/* Max. Quality */
e->quality_max = qmax;
/* Crypto */
nl80211_get_scancrypto(cipher, &e->crypto);
count++;
e++;
memset(ssid, 0, sizeof(ssid));
memset(bssid, 0, sizeof(bssid));
memset(cipher, 0, sizeof(cipher));
nextline:
/* advance to next line */
while( *res && *res++ != '\n' );
}
while( *res );
*len = count * sizeof(struct iwinfo_scanlist_entry);
return 0;
}
}
/* station / ad-hoc / monitor scan */
else if (!nl80211_get_mode(ifname, &mode) &&
(mode == IWINFO_OPMODE_ADHOC ||
mode == IWINFO_OPMODE_MASTER ||
mode == IWINFO_OPMODE_CLIENT ||
mode == IWINFO_OPMODE_MONITOR) &&
iwinfo_ifup(ifname))
{
return nl80211_get_scanlist_nl(ifname, buf, len);
}
/* AP scan */
else
{
/* Got a temp interface, don't create yet another one */
if (!strncmp(ifname, "tmp.", 4))
{
if (!iwinfo_ifup(ifname))
return -1;
nl80211_get_scanlist_nl(ifname, buf, len);
iwinfo_ifdown(ifname);
return 0;
}
/* Spawn a new scan interface */
else
{
if (!(res = nl80211_ifadd(ifname)))
goto out;
iwinfo_ifmac(res);
/* if we can take the new interface up, the driver supports an
* additional interface and there's no need to tear down the ap */
if (iwinfo_ifup(res))
{
nl80211_get_scanlist_nl(res, buf, len);
iwinfo_ifdown(res);
}
/* driver cannot create secondary interface, take down ap
* during scan */
else if (iwinfo_ifdown(ifname) && iwinfo_ifup(res))
{
nl80211_get_scanlist_nl(res, buf, len);
iwinfo_ifdown(res);
iwinfo_ifup(ifname);
nl80211_hostapd_hup(ifname);
}
out:
nl80211_ifdel(res);
return 0;
}
}
return -1;
}
static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
{
int bands_remain, freqs_remain;
struct nl80211_array_buf *arr = arg;
struct iwinfo_freqlist_entry *e = arr->buf;
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
struct nlattr *band, *freq;
static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
[NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
[NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
};
nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
{
nla_parse(bands, NL80211_BAND_ATTR_MAX,
nla_data(band), nla_len(band), NULL);
nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS], freqs_remain)
{
nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
nla_data(freq), nla_len(freq), NULL);
if (!freqs[NL80211_FREQUENCY_ATTR_FREQ] ||
freqs[NL80211_FREQUENCY_ATTR_DISABLED])
continue;
e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
e->channel = nl80211_freq2channel(e->mhz);
e->restricted = (
freqs[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] ||
freqs[NL80211_FREQUENCY_ATTR_NO_IBSS] ||
freqs[NL80211_FREQUENCY_ATTR_RADAR]
) ? 1 : 0;
e++;
arr->count++;
}
}
return NL_SKIP;
}
static int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
{
struct nl80211_msg_conveyor *req;
struct nl80211_array_buf arr = { .buf = buf, .count = 0 };
req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
if (req)
{
nl80211_send(req, nl80211_get_freqlist_cb, &arr);
nl80211_free(req);
}
if (arr.count > 0)
{
*len = arr.count * sizeof(struct iwinfo_freqlist_entry);
return 0;
}
return -1;
}
static int nl80211_get_country_cb(struct nl_msg *msg, void *arg)
{
char *buf = arg;
struct nlattr **attr = nl80211_parse(msg);
if (attr[NL80211_ATTR_REG_ALPHA2])
memcpy(buf, nla_data(attr[NL80211_ATTR_REG_ALPHA2]), 2);
else
buf[0] = 0;
return NL_SKIP;
}
static int nl80211_get_country(const char *ifname, char *buf)
{
int rv = -1;
struct nl80211_msg_conveyor *req;
req = nl80211_msg(ifname, NL80211_CMD_GET_REG, 0);
if (req)
{
nl80211_send(req, nl80211_get_country_cb, buf);
nl80211_free(req);
if (buf[0])
rv = 0;
}
return rv;
}
static int nl80211_get_countrylist(const char *ifname, char *buf, int *len)
{
int i, count;
struct iwinfo_country_entry *e = (struct iwinfo_country_entry *)buf;
const struct iwinfo_iso3166_label *l;
for (l = IWINFO_ISO3166_NAMES, count = 0; l->iso3166; l++, e++, count++)
{
e->iso3166 = l->iso3166;
e->ccode[0] = (l->iso3166 / 256);
e->ccode[1] = (l->iso3166 % 256);
}
*len = (count * sizeof(struct iwinfo_country_entry));
return 0;
}
static int nl80211_get_hwmodelist_cb(struct nl_msg *msg, void *arg)
{
int *modes = arg;
int bands_remain, freqs_remain;
uint16_t caps = 0;
uint32_t vht_caps = 0;
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *bands[NL80211_BAND_ATTR_MAX + 1];
struct nlattr *freqs[NL80211_FREQUENCY_ATTR_MAX + 1];
struct nlattr *band, *freq;
*modes = 0;
if (attr[NL80211_ATTR_WIPHY_BANDS])
{
nla_for_each_nested(band, attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
{
nla_parse(bands, NL80211_BAND_ATTR_MAX,
nla_data(band), nla_len(band), NULL);
if (bands[NL80211_BAND_ATTR_HT_CAPA])
caps = nla_get_u16(bands[NL80211_BAND_ATTR_HT_CAPA]);
/* Treat any nonzero capability as 11n */
if (caps > 0)
*modes |= IWINFO_80211_N;
if (bands[NL80211_BAND_ATTR_VHT_CAPA])
vht_caps = nla_get_u32(bands[NL80211_BAND_ATTR_VHT_CAPA]);
/* Treat any nonzero capability as 11ac */
if (vht_caps > 0)
*modes |= IWINFO_80211_AC;
nla_for_each_nested(freq, bands[NL80211_BAND_ATTR_FREQS],
freqs_remain)
{
nla_parse(freqs, NL80211_FREQUENCY_ATTR_MAX,
nla_data(freq), nla_len(freq), NULL);
if (!freqs[NL80211_FREQUENCY_ATTR_FREQ])
continue;
if (nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]) < 2485)
{
*modes |= IWINFO_80211_B;
*modes |= IWINFO_80211_G;
}
else if (!(*modes & IWINFO_80211_AC))
{
*modes |= IWINFO_80211_A;
}
}
}
}
return NL_SKIP;
}
static int nl80211_get_hwmodelist(const char *ifname, int *buf)
{
struct nl80211_msg_conveyor *req;
req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
if (req)
{
nl80211_send(req, nl80211_get_hwmodelist_cb, buf);
nl80211_free(req);
}
return *buf ? 0 : -1;
}
static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
{
struct nlattr **attr = nl80211_parse(msg);
struct nlattr *comb;
int *ret = arg;
int comb_rem, limit_rem, mode_rem;
*ret = 0;
if (!attr[NL80211_ATTR_INTERFACE_COMBINATIONS])
return NL_SKIP;
nla_for_each_nested(comb, attr[NL80211_ATTR_INTERFACE_COMBINATIONS], comb_rem)
{
static struct nla_policy iface_combination_policy[NUM_NL80211_IFACE_COMB] = {
[NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
[NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
};
struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB];
static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
[NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
[NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
};
struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT];
struct nlattr *limit;
nla_parse_nested(tb_comb, NL80211_BAND_ATTR_MAX, comb, iface_combination_policy);
if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
continue;
nla_for_each_nested(limit, tb_comb[NL80211_IFACE_COMB_LIMITS], limit_rem)
{
struct nlattr *mode;
nla_parse_nested(tb_limit, NUM_NL80211_IFACE_LIMIT, limit, iface_limit_policy);
if (!tb_limit[NL80211_IFACE_LIMIT_TYPES] ||
!tb_limit[NL80211_IFACE_LIMIT_MAX])
continue;
if (nla_get_u32(tb_limit[NL80211_IFACE_LIMIT_MAX]) < 2)
continue;
nla_for_each_nested(mode, tb_limit[NL80211_IFACE_LIMIT_TYPES], mode_rem) {
if (nla_type(mode) == NL80211_IFTYPE_AP)
*ret = 1;
}
}
}
return NL_SKIP;
}
static int nl80211_get_mbssid_support(const char *ifname, int *buf)
{
struct nl80211_msg_conveyor *req;
req = nl80211_msg(ifname, NL80211_CMD_GET_WIPHY, 0);
if (!req)
return -1;
nl80211_send(req, nl80211_get_ifcomb_cb, buf);
nl80211_free(req);
return 0;
}
static int nl80211_get_hardware_id(const char *ifname, char *buf)
{
int rv;
char *res;
/* Got a radioX pseudo interface, find some interface on it or create one */
if (!strncmp(ifname, "radio", 5))
{
/* Reuse existing interface */
if ((res = nl80211_phy2ifname(ifname)) != NULL)
{
rv = wext_ops.hardware_id(res, buf);
}
/* Need to spawn a temporary iface for finding IDs */
else if ((res = nl80211_ifadd(ifname)) != NULL)
{
rv = wext_ops.hardware_id(res, buf);
nl80211_ifdel(res);
}
}
else
{
rv = wext_ops.hardware_id(ifname, buf);
}
/* Failed to obtain hardware IDs, search board config */
if (rv)
{
rv = iwinfo_hardware_id_from_mtd((struct iwinfo_hardware_id *)buf);
}
return rv;
}
static const struct iwinfo_hardware_entry *
nl80211_get_hardware_entry(const char *ifname)
{
struct iwinfo_hardware_id id;
if (nl80211_get_hardware_id(ifname, (char *)&id))
return NULL;
return iwinfo_hardware(&id);
}
static int nl80211_get_hardware_name(const char *ifname, char *buf)
{
const struct iwinfo_hardware_entry *hw;
if (!(hw = nl80211_get_hardware_entry(ifname)))
sprintf(buf, "Generic MAC80211");
else
sprintf(buf, "%s %s", hw->vendor_name, hw->device_name);
return 0;
}
static int nl80211_get_txpower_offset(const char *ifname, int *buf)
{
const struct iwinfo_hardware_entry *hw;
if (!(hw = nl80211_get_hardware_entry(ifname)))
return -1;
*buf = hw->txpower_offset;
return 0;
}
static int nl80211_get_frequency_offset(const char *ifname, int *buf)
{
const struct iwinfo_hardware_entry *hw;
if (!(hw = nl80211_get_hardware_entry(ifname)))
return -1;
*buf = hw->frequency_offset;
return 0;
}
const struct iwinfo_ops nl80211_ops = {
.name = "nl80211",
.probe = nl80211_probe,
.channel = nl80211_get_channel,
.frequency = nl80211_get_frequency,
.frequency_offset = nl80211_get_frequency_offset,
.txpower = nl80211_get_txpower,
.txpower_offset = nl80211_get_txpower_offset,
.bitrate = nl80211_get_bitrate,
.signal = nl80211_get_signal,
.noise = nl80211_get_noise,
.quality = nl80211_get_quality,
.quality_max = nl80211_get_quality_max,
.mbssid_support = nl80211_get_mbssid_support,
.hwmodelist = nl80211_get_hwmodelist,
.mode = nl80211_get_mode,
.ssid = nl80211_get_ssid,
.bssid = nl80211_get_bssid,
.country = nl80211_get_country,
.hardware_id = nl80211_get_hardware_id,
.hardware_name = nl80211_get_hardware_name,
.encryption = nl80211_get_encryption,
.phyname = nl80211_get_phyname,
.assoclist = nl80211_get_assoclist,
.txpwrlist = nl80211_get_txpwrlist,
.scanlist = nl80211_get_scanlist,
.freqlist = nl80211_get_freqlist,
.countrylist = nl80211_get_countrylist,
.close = nl80211_close
};
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