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hostap/src/drivers/driver_nl80211.c
Jouni Malinen 42f1ee7d1f Fixed scan buffer increasing with WEXT 
We can now handle up to 65535 byte result buffer which is the maximum
due to WEXT using 16-bit length field. Previously, this was limited to
32768 bytes in practice even through we tried with 65536 and 131072
buffers which we just truncated into 0 in the 16-bit variable.

This more or less doubles the number of BSSes we can received from scan
results.
2009-02-05 12:00:23 +02:00

2940 lines
73 KiB
C
Raw Blame History

/*
* WPA Supplicant - driver interaction with Linux nl80211/cfg80211
* Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
*
* This program 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.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include <sys/ioctl.h>
#include <net/if_arp.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include "nl80211_copy.h"
#ifdef CONFIG_CLIENT_MLME
#include <netpacket/packet.h>
#include <linux/if_ether.h>
#include "radiotap.h"
#include "radiotap_iter.h"
#endif /* CONFIG_CLIENT_MLME */
#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "eloop.h"
#include "ieee802_11_defs.h"
#ifndef IFF_LOWER_UP
#define IFF_LOWER_UP 0x10000 /* driver signals L1 up */
#endif
#ifndef IFF_DORMANT
#define IFF_DORMANT 0x20000 /* driver signals dormant */
#endif
#ifndef IF_OPER_DORMANT
#define IF_OPER_DORMANT 5
#endif
#ifndef IF_OPER_UP
#define IF_OPER_UP 6
#endif
struct wpa_driver_nl80211_data {
void *ctx;
int event_sock;
int ioctl_sock;
char ifname[IFNAMSIZ + 1];
int ifindex;
int if_removed;
u8 *assoc_req_ies;
size_t assoc_req_ies_len;
u8 *assoc_resp_ies;
size_t assoc_resp_ies_len;
struct wpa_driver_capa capa;
int has_capability;
int we_version_compiled;
/* for set_auth_alg fallback */
int use_crypt;
int auth_alg_fallback;
int operstate;
char mlmedev[IFNAMSIZ + 1];
int scan_complete_events;
struct nl_handle *nl_handle;
struct nl_cache *nl_cache;
struct nl_cb *nl_cb;
struct genl_family *nl80211;
#ifdef CONFIG_CLIENT_MLME
int monitor_sock; /* socket for monitor */
int monitor_ifidx;
#endif /* CONFIG_CLIENT_MLME */
};
static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx,
void *timeout_ctx);
static int wpa_driver_nl80211_set_mode(void *priv, int mode);
static int wpa_driver_nl80211_flush_pmkid(void *priv);
static int wpa_driver_nl80211_get_range(void *priv);
static void
wpa_driver_nl80211_finish_drv_init(struct wpa_driver_nl80211_data *drv);
/* nl80211 code */
static int ack_handler(struct nl_msg *msg, void *arg)
{
int *err = arg;
*err = 0;
return NL_STOP;
}
static int finish_handler(struct nl_msg *msg, void *arg)
{
int *ret = arg;
*ret = 0;
return NL_SKIP;
}
static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
void *arg)
{
int *ret = arg;
*ret = err->error;
return NL_SKIP;
}
static int send_and_recv_msgs(struct wpa_driver_nl80211_data *drv,
struct nl_msg *msg,
int (*valid_handler)(struct nl_msg *, void *),
void *valid_data)
{
struct nl_cb *cb;
int err = -ENOMEM;
cb = nl_cb_clone(drv->nl_cb);
if (!cb)
goto out;
err = nl_send_auto_complete(drv->nl_handle, msg);
if (err < 0)
goto out;
err = 1;
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
if (valid_handler)
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
valid_handler, valid_data);
while (err > 0)
nl_recvmsgs(drv->nl_handle, cb);
out:
nl_cb_put(cb);
nlmsg_free(msg);
return err;
}
static int wpa_driver_nl80211_send_oper_ifla(
struct wpa_driver_nl80211_data *drv,
int linkmode, int operstate)
{
struct {
struct nlmsghdr hdr;
struct ifinfomsg ifinfo;
char opts[16];
} req;
struct rtattr *rta;
static int nl_seq;
ssize_t ret;
os_memset(&req, 0, sizeof(req));
req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.hdr.nlmsg_type = RTM_SETLINK;
req.hdr.nlmsg_flags = NLM_F_REQUEST;
req.hdr.nlmsg_seq = ++nl_seq;
req.hdr.nlmsg_pid = 0;
req.ifinfo.ifi_family = AF_UNSPEC;
req.ifinfo.ifi_type = 0;
req.ifinfo.ifi_index = drv->ifindex;
req.ifinfo.ifi_flags = 0;
req.ifinfo.ifi_change = 0;
if (linkmode != -1) {
rta = (struct rtattr *)
((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len));
rta->rta_type = IFLA_LINKMODE;
rta->rta_len = RTA_LENGTH(sizeof(char));
*((char *) RTA_DATA(rta)) = linkmode;
req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
RTA_LENGTH(sizeof(char));
}
if (operstate != -1) {
rta = (struct rtattr *)
((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len));
rta->rta_type = IFLA_OPERSTATE;
rta->rta_len = RTA_LENGTH(sizeof(char));
*((char *) RTA_DATA(rta)) = operstate;
req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
RTA_LENGTH(sizeof(char));
}
wpa_printf(MSG_DEBUG, "WEXT: Operstate: linkmode=%d, operstate=%d",
linkmode, operstate);
ret = send(drv->event_sock, &req, req.hdr.nlmsg_len, 0);
if (ret < 0) {
wpa_printf(MSG_DEBUG, "WEXT: Sending operstate IFLA failed: "
"%s (assume operstate is not supported)",
strerror(errno));
}
return ret < 0 ? -1 : 0;
}
static int wpa_driver_nl80211_set_auth_param(
struct wpa_driver_nl80211_data *drv, int idx, u32 value)
{
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.param.flags = idx & IW_AUTH_INDEX;
iwr.u.param.value = value;
if (ioctl(drv->ioctl_sock, SIOCSIWAUTH, &iwr) < 0) {
if (errno != EOPNOTSUPP) {
wpa_printf(MSG_DEBUG, "WEXT: SIOCSIWAUTH(param %d "
"value 0x%x) failed: %s)",
idx, value, strerror(errno));
}
ret = errno == EOPNOTSUPP ? -2 : -1;
}
return ret;
}
static int wpa_driver_nl80211_get_bssid(void *priv, u8 *bssid)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
if (ioctl(drv->ioctl_sock, SIOCGIWAP, &iwr) < 0) {
perror("ioctl[SIOCGIWAP]");
ret = -1;
}
os_memcpy(bssid, iwr.u.ap_addr.sa_data, ETH_ALEN);
return ret;
}
static int wpa_driver_nl80211_set_bssid(void *priv, const u8 *bssid)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.ap_addr.sa_family = ARPHRD_ETHER;
if (bssid)
os_memcpy(iwr.u.ap_addr.sa_data, bssid, ETH_ALEN);
else
os_memset(iwr.u.ap_addr.sa_data, 0, ETH_ALEN);
if (ioctl(drv->ioctl_sock, SIOCSIWAP, &iwr) < 0) {
perror("ioctl[SIOCSIWAP]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_get_ssid(void *priv, u8 *ssid)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.essid.pointer = (caddr_t) ssid;
iwr.u.essid.length = 32;
if (ioctl(drv->ioctl_sock, SIOCGIWESSID, &iwr) < 0) {
perror("ioctl[SIOCGIWESSID]");
ret = -1;
} else {
ret = iwr.u.essid.length;
if (ret > 32)
ret = 32;
/* Some drivers include nul termination in the SSID, so let's
* remove it here before further processing. WE-21 changes this
* to explicitly require the length _not_ to include nul
* termination. */
if (ret > 0 && ssid[ret - 1] == '\0' &&
drv->we_version_compiled < 21)
ret--;
}
return ret;
}
static int wpa_driver_nl80211_set_ssid(void *priv, const u8 *ssid,
size_t ssid_len)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
char buf[33];
if (ssid_len > 32)
return -1;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
/* flags: 1 = ESSID is active, 0 = not (promiscuous) */
iwr.u.essid.flags = (ssid_len != 0);
os_memset(buf, 0, sizeof(buf));
os_memcpy(buf, ssid, ssid_len);
iwr.u.essid.pointer = (caddr_t) buf;
if (drv->we_version_compiled < 21) {
/* For historic reasons, set SSID length to include one extra
* character, C string nul termination, even though SSID is
* really an octet string that should not be presented as a C
* string. Some Linux drivers decrement the length by one and
* can thus end up missing the last octet of the SSID if the
* length is not incremented here. WE-21 changes this to
* explicitly require the length _not_ to include nul
* termination. */
if (ssid_len)
ssid_len++;
}
iwr.u.essid.length = ssid_len;
if (ioctl(drv->ioctl_sock, SIOCSIWESSID, &iwr) < 0) {
perror("ioctl[SIOCSIWESSID]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_set_freq(void *priv, int freq)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.freq.m = freq * 100000;
iwr.u.freq.e = 1;
if (ioctl(drv->ioctl_sock, SIOCSIWFREQ, &iwr) < 0) {
perror("ioctl[SIOCSIWFREQ]");
ret = -1;
}
return ret;
}
static void
wpa_driver_nl80211_event_wireless_custom(void *ctx, char *custom)
{
union wpa_event_data data;
wpa_printf(MSG_MSGDUMP, "WEXT: Custom wireless event: '%s'",
custom);
os_memset(&data, 0, sizeof(data));
/* Host AP driver */
if (os_strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
data.michael_mic_failure.unicast =
os_strstr(custom, " unicast ") != NULL;
/* TODO: parse parameters(?) */
wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
} else if (os_strncmp(custom, "ASSOCINFO(ReqIEs=", 17) == 0) {
char *spos;
int bytes;
spos = custom + 17;
bytes = strspn(spos, "0123456789abcdefABCDEF");
if (!bytes || (bytes & 1))
return;
bytes /= 2;
data.assoc_info.req_ies = os_malloc(bytes);
if (data.assoc_info.req_ies == NULL)
return;
data.assoc_info.req_ies_len = bytes;
hexstr2bin(spos, data.assoc_info.req_ies, bytes);
spos += bytes * 2;
data.assoc_info.resp_ies = NULL;
data.assoc_info.resp_ies_len = 0;
if (os_strncmp(spos, " RespIEs=", 9) == 0) {
spos += 9;
bytes = strspn(spos, "0123456789abcdefABCDEF");
if (!bytes || (bytes & 1))
goto done;
bytes /= 2;
data.assoc_info.resp_ies = os_malloc(bytes);
if (data.assoc_info.resp_ies == NULL)
goto done;
data.assoc_info.resp_ies_len = bytes;
hexstr2bin(spos, data.assoc_info.resp_ies, bytes);
}
wpa_supplicant_event(ctx, EVENT_ASSOCINFO, &data);
done:
os_free(data.assoc_info.resp_ies);
os_free(data.assoc_info.req_ies);
#ifdef CONFIG_PEERKEY
} else if (os_strncmp(custom, "STKSTART.request=", 17) == 0) {
if (hwaddr_aton(custom + 17, data.stkstart.peer)) {
wpa_printf(MSG_DEBUG, "WEXT: unrecognized "
"STKSTART.request '%s'", custom + 17);
return;
}
wpa_supplicant_event(ctx, EVENT_STKSTART, &data);
#endif /* CONFIG_PEERKEY */
}
}
static int wpa_driver_nl80211_event_wireless_michaelmicfailure(
void *ctx, const char *ev, size_t len)
{
const struct iw_michaelmicfailure *mic;
union wpa_event_data data;
if (len < sizeof(*mic))
return -1;
mic = (const struct iw_michaelmicfailure *) ev;
wpa_printf(MSG_DEBUG, "Michael MIC failure wireless event: "
"flags=0x%x src_addr=" MACSTR, mic->flags,
MAC2STR(mic->src_addr.sa_data));
os_memset(&data, 0, sizeof(data));
data.michael_mic_failure.unicast = !(mic->flags & IW_MICFAILURE_GROUP);
wpa_supplicant_event(ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
return 0;
}
static int wpa_driver_nl80211_event_wireless_pmkidcand(
struct wpa_driver_nl80211_data *drv, const char *ev, size_t len)
{
const struct iw_pmkid_cand *cand;
union wpa_event_data data;
const u8 *addr;
if (len < sizeof(*cand))
return -1;
cand = (const struct iw_pmkid_cand *) ev;
addr = (const u8 *) cand->bssid.sa_data;
wpa_printf(MSG_DEBUG, "PMKID candidate wireless event: "
"flags=0x%x index=%d bssid=" MACSTR, cand->flags,
cand->index, MAC2STR(addr));
os_memset(&data, 0, sizeof(data));
os_memcpy(data.pmkid_candidate.bssid, addr, ETH_ALEN);
data.pmkid_candidate.index = cand->index;
data.pmkid_candidate.preauth = cand->flags & IW_PMKID_CAND_PREAUTH;
wpa_supplicant_event(drv->ctx, EVENT_PMKID_CANDIDATE, &data);
return 0;
}
static int wpa_driver_nl80211_event_wireless_assocreqie(
struct wpa_driver_nl80211_data *drv, const char *ev, int len)
{
if (len < 0)
return -1;
wpa_hexdump(MSG_DEBUG, "AssocReq IE wireless event", (const u8 *) ev,
len);
os_free(drv->assoc_req_ies);
drv->assoc_req_ies = os_malloc(len);
if (drv->assoc_req_ies == NULL) {
drv->assoc_req_ies_len = 0;
return -1;
}
os_memcpy(drv->assoc_req_ies, ev, len);
drv->assoc_req_ies_len = len;
return 0;
}
static int wpa_driver_nl80211_event_wireless_assocrespie(
struct wpa_driver_nl80211_data *drv, const char *ev, int len)
{
if (len < 0)
return -1;
wpa_hexdump(MSG_DEBUG, "AssocResp IE wireless event", (const u8 *) ev,
len);
os_free(drv->assoc_resp_ies);
drv->assoc_resp_ies = os_malloc(len);
if (drv->assoc_resp_ies == NULL) {
drv->assoc_resp_ies_len = 0;
return -1;
}
os_memcpy(drv->assoc_resp_ies, ev, len);
drv->assoc_resp_ies_len = len;
return 0;
}
static void wpa_driver_nl80211_event_assoc_ies(struct wpa_driver_nl80211_data *drv)
{
union wpa_event_data data;
if (drv->assoc_req_ies == NULL && drv->assoc_resp_ies == NULL)
return;
os_memset(&data, 0, sizeof(data));
if (drv->assoc_req_ies) {
data.assoc_info.req_ies = drv->assoc_req_ies;
drv->assoc_req_ies = NULL;
data.assoc_info.req_ies_len = drv->assoc_req_ies_len;
}
if (drv->assoc_resp_ies) {
data.assoc_info.resp_ies = drv->assoc_resp_ies;
drv->assoc_resp_ies = NULL;
data.assoc_info.resp_ies_len = drv->assoc_resp_ies_len;
}
wpa_supplicant_event(drv->ctx, EVENT_ASSOCINFO, &data);
os_free(data.assoc_info.req_ies);
os_free(data.assoc_info.resp_ies);
}
static void wpa_driver_nl80211_event_wireless(struct wpa_driver_nl80211_data *drv,
void *ctx, char *data, int len)
{
struct iw_event iwe_buf, *iwe = &iwe_buf;
char *pos, *end, *custom, *buf;
pos = data;
end = data + len;
while (pos + IW_EV_LCP_LEN <= end) {
/* Event data may be unaligned, so make a local, aligned copy
* before processing. */
os_memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
wpa_printf(MSG_DEBUG, "Wireless event: cmd=0x%x len=%d",
iwe->cmd, iwe->len);
if (iwe->len <= IW_EV_LCP_LEN)
return;
custom = pos + IW_EV_POINT_LEN;
if (drv->we_version_compiled > 18 &&
(iwe->cmd == IWEVMICHAELMICFAILURE ||
iwe->cmd == IWEVCUSTOM ||
iwe->cmd == IWEVASSOCREQIE ||
iwe->cmd == IWEVASSOCRESPIE ||
iwe->cmd == IWEVPMKIDCAND)) {
/* WE-19 removed the pointer from struct iw_point */
char *dpos = (char *) &iwe_buf.u.data.length;
int dlen = dpos - (char *) &iwe_buf;
os_memcpy(dpos, pos + IW_EV_LCP_LEN,
sizeof(struct iw_event) - dlen);
} else {
os_memcpy(&iwe_buf, pos, sizeof(struct iw_event));
custom += IW_EV_POINT_OFF;
}
switch (iwe->cmd) {
case SIOCGIWAP:
wpa_printf(MSG_DEBUG, "Wireless event: new AP: "
MACSTR,
MAC2STR((u8 *) iwe->u.ap_addr.sa_data));
if (is_zero_ether_addr(
(const u8 *) iwe->u.ap_addr.sa_data) ||
os_memcmp(iwe->u.ap_addr.sa_data,
"\x44\x44\x44\x44\x44\x44", ETH_ALEN) ==
0) {
os_free(drv->assoc_req_ies);
drv->assoc_req_ies = NULL;
os_free(drv->assoc_resp_ies);
drv->assoc_resp_ies = NULL;
wpa_supplicant_event(ctx, EVENT_DISASSOC,
NULL);
} else {
wpa_driver_nl80211_event_assoc_ies(drv);
wpa_supplicant_event(ctx, EVENT_ASSOC, NULL);
}
break;
case IWEVMICHAELMICFAILURE:
wpa_driver_nl80211_event_wireless_michaelmicfailure(
ctx, custom, iwe->u.data.length);
break;
case IWEVCUSTOM:
if (custom + iwe->u.data.length > end)
return;
buf = os_malloc(iwe->u.data.length + 1);
if (buf == NULL)
return;
os_memcpy(buf, custom, iwe->u.data.length);
buf[iwe->u.data.length] = '\0';
wpa_driver_nl80211_event_wireless_custom(ctx, buf);
os_free(buf);
break;
case SIOCGIWSCAN:
drv->scan_complete_events = 1;
eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout,
drv, ctx);
wpa_supplicant_event(ctx, EVENT_SCAN_RESULTS, NULL);
break;
case IWEVASSOCREQIE:
wpa_driver_nl80211_event_wireless_assocreqie(
drv, custom, iwe->u.data.length);
break;
case IWEVASSOCRESPIE:
wpa_driver_nl80211_event_wireless_assocrespie(
drv, custom, iwe->u.data.length);
break;
case IWEVPMKIDCAND:
wpa_driver_nl80211_event_wireless_pmkidcand(
drv, custom, iwe->u.data.length);
break;
}
pos += iwe->len;
}
}
static void wpa_driver_nl80211_event_link(struct wpa_driver_nl80211_data *drv,
void *ctx, char *buf, size_t len,
int del)
{
union wpa_event_data event;
os_memset(&event, 0, sizeof(event));
if (len > sizeof(event.interface_status.ifname))
len = sizeof(event.interface_status.ifname) - 1;
os_memcpy(event.interface_status.ifname, buf, len);
event.interface_status.ievent = del ? EVENT_INTERFACE_REMOVED :
EVENT_INTERFACE_ADDED;
wpa_printf(MSG_DEBUG, "RTM_%sLINK, IFLA_IFNAME: Interface '%s' %s",
del ? "DEL" : "NEW",
event.interface_status.ifname,
del ? "removed" : "added");
if (os_strcmp(drv->ifname, event.interface_status.ifname) == 0) {
if (del)
drv->if_removed = 1;
else
drv->if_removed = 0;
}
wpa_supplicant_event(ctx, EVENT_INTERFACE_STATUS, &event);
}
static int wpa_driver_nl80211_own_ifname(struct wpa_driver_nl80211_data *drv,
struct nlmsghdr *h)
{
struct ifinfomsg *ifi;
int attrlen, _nlmsg_len, rta_len;
struct rtattr *attr;
ifi = NLMSG_DATA(h);
_nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));
attrlen = h->nlmsg_len - _nlmsg_len;
if (attrlen < 0)
return 0;
attr = (struct rtattr *) (((char *) ifi) + _nlmsg_len);
rta_len = RTA_ALIGN(sizeof(struct rtattr));
while (RTA_OK(attr, attrlen)) {
if (attr->rta_type == IFLA_IFNAME) {
if (os_strcmp(((char *) attr) + rta_len, drv->ifname)
== 0)
return 1;
else
break;
}
attr = RTA_NEXT(attr, attrlen);
}
return 0;
}
static int wpa_driver_nl80211_own_ifindex(struct wpa_driver_nl80211_data *drv,
int ifindex, struct nlmsghdr *h)
{
if (drv->ifindex == ifindex)
return 1;
if (drv->if_removed && wpa_driver_nl80211_own_ifname(drv, h)) {
drv->ifindex = if_nametoindex(drv->ifname);
wpa_printf(MSG_DEBUG, "nl80211: Update ifindex for a removed "
"interface");
wpa_driver_nl80211_finish_drv_init(drv);
return 1;
}
return 0;
}
static void wpa_driver_nl80211_event_rtm_newlink(struct wpa_driver_nl80211_data *drv,
void *ctx, struct nlmsghdr *h,
size_t len)
{
struct ifinfomsg *ifi;
int attrlen, _nlmsg_len, rta_len;
struct rtattr * attr;
if (len < sizeof(*ifi))
return;
ifi = NLMSG_DATA(h);
if (!wpa_driver_nl80211_own_ifindex(drv, ifi->ifi_index, h)) {
wpa_printf(MSG_DEBUG, "Ignore event for foreign ifindex %d",
ifi->ifi_index);
return;
}
wpa_printf(MSG_DEBUG, "RTM_NEWLINK: operstate=%d ifi_flags=0x%x "
"(%s%s%s%s)",
drv->operstate, ifi->ifi_flags,
(ifi->ifi_flags & IFF_UP) ? "[UP]" : "",
(ifi->ifi_flags & IFF_RUNNING) ? "[RUNNING]" : "",
(ifi->ifi_flags & IFF_LOWER_UP) ? "[LOWER_UP]" : "",
(ifi->ifi_flags & IFF_DORMANT) ? "[DORMANT]" : "");
/*
* Some drivers send the association event before the operup event--in
* this case, lifting operstate in wpa_driver_nl80211_set_operstate()
* fails. This will hit us when wpa_supplicant does not need to do
* IEEE 802.1X authentication
*/
if (drv->operstate == 1 &&
(ifi->ifi_flags & (IFF_LOWER_UP | IFF_DORMANT)) == IFF_LOWER_UP &&
!(ifi->ifi_flags & IFF_RUNNING))
wpa_driver_nl80211_send_oper_ifla(drv, -1, IF_OPER_UP);
_nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));
attrlen = h->nlmsg_len - _nlmsg_len;
if (attrlen < 0)
return;
attr = (struct rtattr *) (((char *) ifi) + _nlmsg_len);
rta_len = RTA_ALIGN(sizeof(struct rtattr));
while (RTA_OK(attr, attrlen)) {
if (attr->rta_type == IFLA_WIRELESS) {
wpa_driver_nl80211_event_wireless(
drv, ctx, ((char *) attr) + rta_len,
attr->rta_len - rta_len);
} else if (attr->rta_type == IFLA_IFNAME) {
wpa_driver_nl80211_event_link(
drv, ctx,
((char *) attr) + rta_len,
attr->rta_len - rta_len, 0);
}
attr = RTA_NEXT(attr, attrlen);
}
}
static void wpa_driver_nl80211_event_rtm_dellink(struct wpa_driver_nl80211_data *drv,
void *ctx, struct nlmsghdr *h,
size_t len)
{
struct ifinfomsg *ifi;
int attrlen, _nlmsg_len, rta_len;
struct rtattr * attr;
if (len < sizeof(*ifi))
return;
ifi = NLMSG_DATA(h);
_nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));
attrlen = h->nlmsg_len - _nlmsg_len;
if (attrlen < 0)
return;
attr = (struct rtattr *) (((char *) ifi) + _nlmsg_len);
rta_len = RTA_ALIGN(sizeof(struct rtattr));
while (RTA_OK(attr, attrlen)) {
if (attr->rta_type == IFLA_IFNAME) {
wpa_driver_nl80211_event_link(
drv, ctx,
((char *) attr) + rta_len,
attr->rta_len - rta_len, 1);
}
attr = RTA_NEXT(attr, attrlen);
}
}
static void wpa_driver_nl80211_event_receive(int sock, void *eloop_ctx,
void *sock_ctx)
{
char buf[8192];
int left;
struct sockaddr_nl from;
socklen_t fromlen;
struct nlmsghdr *h;
int max_events = 10;
try_again:
fromlen = sizeof(from);
left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
(struct sockaddr *) &from, &fromlen);
if (left < 0) {
if (errno != EINTR && errno != EAGAIN)
perror("recvfrom(netlink)");
return;
}
h = (struct nlmsghdr *) buf;
while (left >= (int) sizeof(*h)) {
int len, plen;
len = h->nlmsg_len;
plen = len - sizeof(*h);
if (len > left || plen < 0) {
wpa_printf(MSG_DEBUG, "Malformed netlink message: "
"len=%d left=%d plen=%d",
len, left, plen);
break;
}
switch (h->nlmsg_type) {
case RTM_NEWLINK:
wpa_driver_nl80211_event_rtm_newlink(eloop_ctx, sock_ctx,
h, plen);
break;
case RTM_DELLINK:
wpa_driver_nl80211_event_rtm_dellink(eloop_ctx, sock_ctx,
h, plen);
break;
}
len = NLMSG_ALIGN(len);
left -= len;
h = (struct nlmsghdr *) ((char *) h + len);
}
if (left > 0) {
wpa_printf(MSG_DEBUG, "%d extra bytes in the end of netlink "
"message", left);
}
if (--max_events > 0) {
/*
* Try to receive all events in one eloop call in order to
* limit race condition on cases where AssocInfo event, Assoc
* event, and EAPOL frames are received more or less at the
* same time. We want to process the event messages first
* before starting EAPOL processing.
*/
goto try_again;
}
}
static int wpa_driver_nl80211_get_ifflags_ifname(struct wpa_driver_nl80211_data *drv,
const char *ifname, int *flags)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(drv->ioctl_sock, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
perror("ioctl[SIOCGIFFLAGS]");
return -1;
}
*flags = ifr.ifr_flags & 0xffff;
return 0;
}
/**
* wpa_driver_nl80211_get_ifflags - Get interface flags (SIOCGIFFLAGS)
* @drv: driver_nl80211 private data
* @flags: Pointer to returned flags value
* Returns: 0 on success, -1 on failure
*/
static int wpa_driver_nl80211_get_ifflags(struct wpa_driver_nl80211_data *drv,
int *flags)
{
return wpa_driver_nl80211_get_ifflags_ifname(drv, drv->ifname, flags);
}
static int wpa_driver_nl80211_set_ifflags_ifname(
struct wpa_driver_nl80211_data *drv,
const char *ifname, int flags)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
ifr.ifr_flags = flags & 0xffff;
if (ioctl(drv->ioctl_sock, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
perror("SIOCSIFFLAGS");
return -1;
}
return 0;
}
/**
* wpa_driver_nl80211_set_ifflags - Set interface flags (SIOCSIFFLAGS)
* @drv: driver_nl80211 private data
* @flags: New value for flags
* Returns: 0 on success, -1 on failure
*/
static int wpa_driver_nl80211_set_ifflags(struct wpa_driver_nl80211_data *drv,
int flags)
{
return wpa_driver_nl80211_set_ifflags_ifname(drv, drv->ifname, flags);
}
/**
* wpa_driver_nl80211_set_country - ask nl80211 to set the regulatory domain
* @priv: driver_nl80211 private data
* @alpha2_arg: country to which to switch to
* Returns: 0 on success, -1 on failure
*
* This asks nl80211 to set the regulatory domain for given
* country ISO / IEC alpha2.
*/
static int wpa_driver_nl80211_set_country(void *priv, const char *alpha2_arg)
{
struct wpa_driver_nl80211_data *drv = priv;
char alpha2[3];
struct nl_msg *msg;
msg = nlmsg_alloc();
if (!msg)
goto nla_put_failure;
alpha2[0] = alpha2_arg[0];
alpha2[1] = alpha2_arg[1];
alpha2[2] = '\0';
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_REQ_SET_REG, 0);
NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, alpha2);
if (send_and_recv_msgs(drv, msg, NULL, NULL))
return -EINVAL;
return 0;
nla_put_failure:
return -EINVAL;
}
static int wpa_driver_nl80211_set_probe_req_ie(void *priv, const u8 *ies,
size_t ies_len)
{
struct wpa_driver_nl80211_data *drv = priv;
struct nl_msg *msg;
int ret = -1;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
NL80211_CMD_SET_MGMT_EXTRA_IE, 0);
NLA_PUT_U8(msg, NL80211_ATTR_MGMT_SUBTYPE, 4 /* ProbeReq */);
if (ies)
NLA_PUT(msg, NL80211_ATTR_IE, ies_len, ies);
ret = 0;
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
return ret;
nla_put_failure:
return -ENOBUFS;
}
#ifdef CONFIG_CLIENT_MLME
static int nl80211_set_vif(struct wpa_driver_nl80211_data *drv,
int drop_unencrypted, int userspace_mlme)
{
#ifdef NL80211_CMD_SET_VIF
struct nl_msg *msg;
int ret = -1;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
NL80211_CMD_SET_VIF, 0);
if (drop_unencrypted >= 0)
NLA_PUT_U8(msg, NL80211_ATTR_VIF_DROP_UNENCRYPTED,
drop_unencrypted);
if (userspace_mlme >= 0)
NLA_PUT_U8(msg, NL80211_ATTR_VIF_USERSPACE_MLME,
userspace_mlme);
ret = 0;
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
return ret;
nla_put_failure:
return -ENOBUFS;
#else /* NL80211_CMD_SET_VIF */
return -1;
#endif /* NL80211_CMD_SET_VIF */
}
static int wpa_driver_nl80211_set_userspace_mlme(
struct wpa_driver_nl80211_data *drv, int enabled)
{
return nl80211_set_vif(drv, -1, enabled);
}
static void nl80211_remove_iface(struct wpa_driver_nl80211_data *drv,
int ifidx)
{
struct nl_msg *msg;
msg = nlmsg_alloc();
if (!msg)
goto nla_put_failure;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_DEL_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifidx);
if (send_and_recv_msgs(drv, msg, NULL, NULL) == 0)
return;
nla_put_failure:
wpa_printf(MSG_ERROR, "nl80211: Failed to remove interface.");
}
static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
const char *ifname, enum nl80211_iftype iftype)
{
struct nl_msg *msg, *flags = NULL;
int ifidx, err;
int ret = -ENOBUFS;
msg = nlmsg_alloc();
if (!msg)
return -1;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_NEW_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(drv->ifname));
NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, ifname);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, iftype);
if (iftype == NL80211_IFTYPE_MONITOR) {
flags = nlmsg_alloc();
if (!flags)
goto nla_put_failure;
NLA_PUT_FLAG(flags, NL80211_MNTR_FLAG_COOK_FRAMES);
err = nla_put_nested(msg, NL80211_ATTR_MNTR_FLAGS, flags);
nlmsg_free(flags);
if (err)
goto nla_put_failure;
}
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
if (ret) {
nla_put_failure:
wpa_printf(MSG_ERROR, "nl80211: Failed to create interface %d",
ret);
return ret;
}
ifidx = if_nametoindex(ifname);
if (ifidx <= 0)
return -1;
return ifidx;
}
static void handle_monitor_read(int sock, void *eloop_ctx, void *sock_ctx)
{
struct wpa_driver_nl80211_data *drv = eloop_ctx;
int len;
unsigned char buf[3000];
struct ieee80211_radiotap_iterator iter;
int ret;
int injected = 0, failed = 0, rxflags = 0;
struct ieee80211_rx_status rx_status;
len = recv(sock, buf, sizeof(buf), 0);
if (len < 0) {
perror("recv");
return;
}
if (ieee80211_radiotap_iterator_init(&iter, (void *) buf, len)) {
wpa_printf(MSG_DEBUG, "nl80211: received invalid radiotap "
"frame");
return;
}
os_memset(&rx_status, 0, sizeof(rx_status));
while (1) {
ret = ieee80211_radiotap_iterator_next(&iter);
if (ret == -ENOENT)
break;
if (ret) {
wpa_printf(MSG_DEBUG, "nl80211: received invalid "
"radiotap frame (%d)", ret);
return;
}
switch (iter.this_arg_index) {
case IEEE80211_RADIOTAP_FLAGS:
if (*iter.this_arg & IEEE80211_RADIOTAP_F_FCS)
len -= 4;
break;
case IEEE80211_RADIOTAP_RX_FLAGS:
rxflags = 1;
break;
case IEEE80211_RADIOTAP_TX_FLAGS:
injected = 1;
failed = le_to_host16((*(u16 *) iter.this_arg)) &
IEEE80211_RADIOTAP_F_TX_FAIL;
break;
case IEEE80211_RADIOTAP_DATA_RETRIES:
break;
case IEEE80211_RADIOTAP_CHANNEL:
/* TODO convert from freq/flags to channel number
* rx_status.channel = XXX;
*/
break;
case IEEE80211_RADIOTAP_RATE:
break;
case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
rx_status.ssi = *iter.this_arg;
break;
}
}
if (rxflags && injected)
return;
if (!injected) {
wpa_supplicant_sta_rx(drv->ctx, buf + iter.max_length,
len - iter.max_length, &rx_status);
} else if (failed) {
/* TX failure callback */
} else {
/* TX success (ACK) callback */
}
}
static int wpa_driver_nl80211_create_monitor_interface(
struct wpa_driver_nl80211_data *drv)
{
char buf[IFNAMSIZ];
struct sockaddr_ll ll;
int optval, flags;
socklen_t optlen;
os_snprintf(buf, IFNAMSIZ, "mon.%s", drv->ifname);
buf[IFNAMSIZ - 1] = '\0';
drv->monitor_ifidx =
nl80211_create_iface(drv, buf, NL80211_IFTYPE_MONITOR);
if (drv->monitor_ifidx < 0)
return -1;
if (wpa_driver_nl80211_get_ifflags_ifname(drv, buf, &flags) != 0 ||
wpa_driver_nl80211_set_ifflags_ifname(drv, buf, flags | IFF_UP) !=
0) {
wpa_printf(MSG_ERROR, "nl80211: Could not set interface '%s' "
"UP", buf);
goto error;
}
os_memset(&ll, 0, sizeof(ll));
ll.sll_family = AF_PACKET;
ll.sll_ifindex = drv->monitor_ifidx;
drv->monitor_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (drv->monitor_sock < 0) {
perror("socket[PF_PACKET,SOCK_RAW]");
goto error;
}
if (bind(drv->monitor_sock, (struct sockaddr *) &ll,
sizeof(ll)) < 0) {
perror("monitor socket bind");
goto error;
}
optlen = sizeof(optval);
optval = 20;
if (setsockopt
(drv->monitor_sock, SOL_SOCKET, SO_PRIORITY, &optval, optlen)) {
perror("Failed to set socket priority");
goto error;
}
if (eloop_register_read_sock(drv->monitor_sock, handle_monitor_read,
drv, NULL)) {
wpa_printf(MSG_ERROR, "nl80211: Could not register monitor "
"read socket");
goto error;
}
return 0;
error:
nl80211_remove_iface(drv, drv->monitor_ifidx);
return -1;
}
#endif /* CONFIG_CLIENT_MLME */
/**
* wpa_driver_nl80211_init - Initialize nl80211 driver interface
* @ctx: context to be used when calling wpa_supplicant functions,
* e.g., wpa_supplicant_event()
* @ifname: interface name, e.g., wlan0
* Returns: Pointer to private data, %NULL on failure
*/
static void * wpa_driver_nl80211_init(void *ctx, const char *ifname)
{
int s;
struct sockaddr_nl local;
struct wpa_driver_nl80211_data *drv;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
return NULL;
drv->ctx = ctx;
os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
drv->nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
if (drv->nl_cb == NULL) {
wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink "
"callbacks");
goto err1;
}
drv->nl_handle = nl_handle_alloc_cb(drv->nl_cb);
if (drv->nl_handle == NULL) {
wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink "
"callbacks");
goto err2;
}
if (genl_connect(drv->nl_handle)) {
wpa_printf(MSG_ERROR, "nl80211: Failed to connect to generic "
"netlink");
goto err3;
}
drv->nl_cache = genl_ctrl_alloc_cache(drv->nl_handle);
if (drv->nl_cache == NULL) {
wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
"netlink cache");
goto err3;
}
drv->nl80211 = genl_ctrl_search_by_name(drv->nl_cache, "nl80211");
if (drv->nl80211 == NULL) {
wpa_printf(MSG_ERROR, "nl80211: 'nl80211' generic netlink not "
"found");
goto err4;
}
drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
if (drv->ioctl_sock < 0) {
perror("socket(PF_INET,SOCK_DGRAM)");
goto err5;
}
s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (s < 0) {
perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
goto err6;
}
os_memset(&local, 0, sizeof(local));
local.nl_family = AF_NETLINK;
local.nl_groups = RTMGRP_LINK;
if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
perror("bind(netlink)");
close(s);
goto err6;
}
eloop_register_read_sock(s, wpa_driver_nl80211_event_receive, drv,
ctx);
drv->event_sock = s;
wpa_driver_nl80211_finish_drv_init(drv);
return drv;
err6:
close(drv->ioctl_sock);
err5:
genl_family_put(drv->nl80211);
err4:
nl_cache_free(drv->nl_cache);
err3:
nl_handle_destroy(drv->nl_handle);
err2:
nl_cb_put(drv->nl_cb);
err1:
os_free(drv);
return NULL;
}
static void
wpa_driver_nl80211_finish_drv_init(struct wpa_driver_nl80211_data *drv)
{
int flags;
if (wpa_driver_nl80211_get_ifflags(drv, &flags) != 0)
printf("Could not get interface '%s' flags\n", drv->ifname);
else if (!(flags & IFF_UP)) {
if (wpa_driver_nl80211_set_ifflags(drv, flags | IFF_UP) != 0) {
printf("Could not set interface '%s' UP\n",
drv->ifname);
} else {
/*
* Wait some time to allow driver to initialize before
* starting configuring the driver. This seems to be
* needed at least some drivers that load firmware etc.
* when the interface is set up.
*/
wpa_printf(MSG_DEBUG, "Interface %s set UP - waiting "
"a second for the driver to complete "
"initialization", drv->ifname);
sleep(1);
}
}
/*
* Make sure that the driver does not have any obsolete PMKID entries.
*/
wpa_driver_nl80211_flush_pmkid(drv);
if (wpa_driver_nl80211_set_mode(drv, 0) < 0) {
printf("Could not configure driver to use managed mode\n");
}
wpa_driver_nl80211_get_range(drv);
drv->ifindex = if_nametoindex(drv->ifname);
wpa_driver_nl80211_send_oper_ifla(drv, 1, IF_OPER_DORMANT);
}
/**
* wpa_driver_nl80211_deinit - Deinitialize nl80211 driver interface
* @priv: Pointer to private nl80211 data from wpa_driver_nl80211_init()
*
* Shut down driver interface and processing of driver events. Free
* private data buffer if one was allocated in wpa_driver_nl80211_init().
*/
static void wpa_driver_nl80211_deinit(void *priv)
{
struct wpa_driver_nl80211_data *drv = priv;
int flags;
#ifdef CONFIG_CLIENT_MLME
if (drv->monitor_sock >= 0) {
eloop_unregister_read_sock(drv->monitor_sock);
close(drv->monitor_sock);
}
if (drv->monitor_ifidx > 0)
nl80211_remove_iface(drv, drv->monitor_ifidx);
if (drv->capa.flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
wpa_driver_nl80211_set_userspace_mlme(drv, 0);
#endif /* CONFIG_CLIENT_MLME */
eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
/*
* Clear possibly configured driver parameters in order to make it
* easier to use the driver after wpa_supplicant has been terminated.
*/
(void) wpa_driver_nl80211_set_bssid(drv,
(u8 *) "\x00\x00\x00\x00\x00\x00");
wpa_driver_nl80211_send_oper_ifla(priv, 0, IF_OPER_UP);
eloop_unregister_read_sock(drv->event_sock);
if (wpa_driver_nl80211_get_ifflags(drv, &flags) == 0)
(void) wpa_driver_nl80211_set_ifflags(drv, flags & ~IFF_UP);
close(drv->event_sock);
close(drv->ioctl_sock);
os_free(drv->assoc_req_ies);
os_free(drv->assoc_resp_ies);
genl_family_put(drv->nl80211);
nl_cache_free(drv->nl_cache);
nl_handle_destroy(drv->nl_handle);
nl_cb_put(drv->nl_cb);
os_free(drv);
}
/**
* wpa_driver_nl80211_scan_timeout - Scan timeout to report scan completion
* @eloop_ctx: Unused
* @timeout_ctx: ctx argument given to wpa_driver_nl80211_init()
*
* This function can be used as registered timeout when starting a scan to
* generate a scan completed event if the driver does not report this.
*/
static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
{
wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
}
/**
* wpa_driver_nl80211_scan - Request the driver to initiate scan
* @priv: Pointer to private wext data from wpa_driver_nl80211_init()
* @ssid: Specific SSID to scan for (ProbeReq) or %NULL to scan for
* all SSIDs (either active scan with broadcast SSID or passive
* scan
* @ssid_len: Length of the SSID
* Returns: 0 on success, -1 on failure
*/
static int wpa_driver_nl80211_scan(void *priv, const u8 *ssid, size_t ssid_len)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0, timeout;
struct iw_scan_req req;
if (ssid_len > IW_ESSID_MAX_SIZE) {
wpa_printf(MSG_DEBUG, "%s: too long SSID (%lu)",
__FUNCTION__, (unsigned long) ssid_len);
return -1;
}
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
if (ssid && ssid_len) {
os_memset(&req, 0, sizeof(req));
req.essid_len = ssid_len;
req.bssid.sa_family = ARPHRD_ETHER;
os_memset(req.bssid.sa_data, 0xff, ETH_ALEN);
os_memcpy(req.essid, ssid, ssid_len);
iwr.u.data.pointer = (caddr_t) &req;
iwr.u.data.length = sizeof(req);
iwr.u.data.flags = IW_SCAN_THIS_ESSID;
}
if (ioctl(drv->ioctl_sock, SIOCSIWSCAN, &iwr) < 0) {
perror("ioctl[SIOCSIWSCAN]");
ret = -1;
}
/* Not all drivers generate "scan completed" wireless event, so try to
* read results after a timeout. */
timeout = 5;
if (drv->scan_complete_events) {
/*
* The driver seems to deliver SIOCGIWSCAN events to notify
* when scan is complete, so use longer timeout to avoid race
* conditions with scanning and following association request.
*/
timeout = 30;
}
wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
"seconds", ret, timeout);
eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout, drv,
drv->ctx);
return ret;
}
static u8 * wpa_driver_nl80211_giwscan(struct wpa_driver_nl80211_data *drv,
size_t *len)
{
struct iwreq iwr;
u8 *res_buf;
size_t res_buf_len;
res_buf_len = IW_SCAN_MAX_DATA;
for (;;) {
res_buf = os_malloc(res_buf_len);
if (res_buf == NULL)
return NULL;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.data.pointer = res_buf;
iwr.u.data.length = res_buf_len;
if (ioctl(drv->ioctl_sock, SIOCGIWSCAN, &iwr) == 0)
break;
if (errno == E2BIG && res_buf_len < 65535) {
os_free(res_buf);
res_buf = NULL;
res_buf_len *= 2;
if (res_buf_len > 65535)
res_buf_len = 65535; /* 16-bit length field */
wpa_printf(MSG_DEBUG, "Scan results did not fit - "
"trying larger buffer (%lu bytes)",
(unsigned long) res_buf_len);
} else {
perror("ioctl[SIOCGIWSCAN]");
os_free(res_buf);
return NULL;
}
}
if (iwr.u.data.length > res_buf_len) {
os_free(res_buf);
return NULL;
}
*len = iwr.u.data.length;
return res_buf;
}
/*
* Data structure for collecting WEXT scan results. This is needed to allow
* the various methods of reporting IEs to be combined into a single IE buffer.
*/
struct wext_scan_data {
struct wpa_scan_res res;
u8 *ie;
size_t ie_len;
u8 ssid[32];
size_t ssid_len;
int maxrate;
};
static void wext_get_scan_mode(struct iw_event *iwe,
struct wext_scan_data *res)
{
if (iwe->u.mode == IW_MODE_ADHOC)
res->res.caps |= IEEE80211_CAP_IBSS;
else if (iwe->u.mode == IW_MODE_MASTER || iwe->u.mode == IW_MODE_INFRA)
res->res.caps |= IEEE80211_CAP_ESS;
}
static void wext_get_scan_ssid(struct iw_event *iwe,
struct wext_scan_data *res, char *custom,
char *end)
{
int ssid_len = iwe->u.essid.length;
if (custom + ssid_len > end)
return;
if (iwe->u.essid.flags &&
ssid_len > 0 &&
ssid_len <= IW_ESSID_MAX_SIZE) {
os_memcpy(res->ssid, custom, ssid_len);
res->ssid_len = ssid_len;
}
}
static void wext_get_scan_freq(struct iw_event *iwe,
struct wext_scan_data *res)
{
int divi = 1000000, i;
if (iwe->u.freq.e == 0) {
/*
* Some drivers do not report frequency, but a channel.
* Try to map this to frequency by assuming they are using
* IEEE 802.11b/g. But don't overwrite a previously parsed
* frequency if the driver sends both frequency and channel,
* since the driver may be sending an A-band channel that we
* don't handle here.
*/
if (res->res.freq)
return;
if (iwe->u.freq.m >= 1 && iwe->u.freq.m <= 13) {
res->res.freq = 2407 + 5 * iwe->u.freq.m;
return;
} else if (iwe->u.freq.m == 14) {
res->res.freq = 2484;
return;
}
}
if (iwe->u.freq.e > 6) {
wpa_printf(MSG_DEBUG, "Invalid freq in scan results (BSSID="
MACSTR " m=%d e=%d)",
MAC2STR(res->res.bssid), iwe->u.freq.m,
iwe->u.freq.e);
return;
}
for (i = 0; i < iwe->u.freq.e; i++)
divi /= 10;
res->res.freq = iwe->u.freq.m / divi;
}
static void wext_get_scan_qual(struct iw_event *iwe,
struct wext_scan_data *res)
{
res->res.qual = iwe->u.qual.qual;
res->res.noise = iwe->u.qual.noise;
res->res.level = iwe->u.qual.level;
}
static void wext_get_scan_encode(struct iw_event *iwe,
struct wext_scan_data *res)
{
if (!(iwe->u.data.flags & IW_ENCODE_DISABLED))
res->res.caps |= IEEE80211_CAP_PRIVACY;
}
static void wext_get_scan_rate(struct iw_event *iwe,
struct wext_scan_data *res, char *pos,
char *end)
{
int maxrate;
char *custom = pos + IW_EV_LCP_LEN;
struct iw_param p;
size_t clen;
clen = iwe->len;
if (custom + clen > end)
return;
maxrate = 0;
while (((ssize_t) clen) >= (ssize_t) sizeof(struct iw_param)) {
/* Note: may be misaligned, make a local, aligned copy */
os_memcpy(&p, custom, sizeof(struct iw_param));
if (p.value > maxrate)
maxrate = p.value;
clen -= sizeof(struct iw_param);
custom += sizeof(struct iw_param);
}
/* Convert the maxrate from WE-style (b/s units) to
* 802.11 rates (500000 b/s units).
*/
res->maxrate = maxrate / 500000;
}
static void wext_get_scan_iwevgenie(struct iw_event *iwe,
struct wext_scan_data *res, char *custom,
char *end)
{
char *genie, *gpos, *gend;
u8 *tmp;
if (iwe->u.data.length == 0)
return;
gpos = genie = custom;
gend = genie + iwe->u.data.length;
if (gend > end) {
wpa_printf(MSG_INFO, "IWEVGENIE overflow");
return;
}
tmp = os_realloc(res->ie, res->ie_len + gend - gpos);
if (tmp == NULL)
return;
os_memcpy(tmp + res->ie_len, gpos, gend - gpos);
res->ie = tmp;
res->ie_len += gend - gpos;
}
static void wext_get_scan_custom(struct iw_event *iwe,
struct wext_scan_data *res, char *custom,
char *end)
{
size_t clen;
u8 *tmp;
clen = iwe->u.data.length;
if (custom + clen > end)
return;
if (clen > 7 && os_strncmp(custom, "wpa_ie=", 7) == 0) {
char *spos;
int bytes;
spos = custom + 7;
bytes = custom + clen - spos;
if (bytes & 1 || bytes == 0)
return;
bytes /= 2;
tmp = os_realloc(res->ie, res->ie_len + bytes);
if (tmp == NULL)
return;
hexstr2bin(spos, tmp + res->ie_len, bytes);
res->ie = tmp;
res->ie_len += bytes;
} else if (clen > 7 && os_strncmp(custom, "rsn_ie=", 7) == 0) {
char *spos;
int bytes;
spos = custom + 7;
bytes = custom + clen - spos;
if (bytes & 1 || bytes == 0)
return;
bytes /= 2;
tmp = os_realloc(res->ie, res->ie_len + bytes);
if (tmp == NULL)
return;
hexstr2bin(spos, tmp + res->ie_len, bytes);
res->ie = tmp;
res->ie_len += bytes;
} else if (clen > 4 && os_strncmp(custom, "tsf=", 4) == 0) {
char *spos;
int bytes;
u8 bin[8];
spos = custom + 4;
bytes = custom + clen - spos;
if (bytes != 16) {
wpa_printf(MSG_INFO, "Invalid TSF length (%d)", bytes);
return;
}
bytes /= 2;
hexstr2bin(spos, bin, bytes);
res->res.tsf += WPA_GET_BE64(bin);
}
}
static int wext_19_iw_point(struct wpa_driver_nl80211_data *drv, u16 cmd)
{
return drv->we_version_compiled > 18 &&
(cmd == SIOCGIWESSID || cmd == SIOCGIWENCODE ||
cmd == IWEVGENIE || cmd == IWEVCUSTOM);
}
static void wpa_driver_nl80211_add_scan_entry(struct wpa_scan_results *res,
struct wext_scan_data *data)
{
struct wpa_scan_res **tmp;
struct wpa_scan_res *r;
size_t extra_len;
u8 *pos, *end, *ssid_ie = NULL, *rate_ie = NULL;
/* Figure out whether we need to fake any IEs */
pos = data->ie;
end = pos + data->ie_len;
while (pos && pos + 1 < end) {
if (pos + 2 + pos[1] > end)
break;
if (pos[0] == WLAN_EID_SSID)
ssid_ie = pos;
else if (pos[0] == WLAN_EID_SUPP_RATES)
rate_ie = pos;
else if (pos[0] == WLAN_EID_EXT_SUPP_RATES)
rate_ie = pos;
pos += 2 + pos[1];
}
extra_len = 0;
if (ssid_ie == NULL)
extra_len += 2 + data->ssid_len;
if (rate_ie == NULL && data->maxrate)
extra_len += 3;
r = os_zalloc(sizeof(*r) + extra_len + data->ie_len);
if (r == NULL)
return;
os_memcpy(r, &data->res, sizeof(*r));
r->ie_len = extra_len + data->ie_len;
pos = (u8 *) (r + 1);
if (ssid_ie == NULL) {
/*
* Generate a fake SSID IE since the driver did not report
* a full IE list.
*/
*pos++ = WLAN_EID_SSID;
*pos++ = data->ssid_len;
os_memcpy(pos, data->ssid, data->ssid_len);
pos += data->ssid_len;
}
if (rate_ie == NULL && data->maxrate) {
/*
* Generate a fake Supported Rates IE since the driver did not
* report a full IE list.
*/
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = 1;
*pos++ = data->maxrate;
}
if (data->ie)
os_memcpy(pos, data->ie, data->ie_len);
tmp = os_realloc(res->res,
(res->num + 1) * sizeof(struct wpa_scan_res *));
if (tmp == NULL) {
os_free(r);
return;
}
tmp[res->num++] = r;
res->res = tmp;
}
/**
* wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
* @priv: Pointer to private wext data from wpa_driver_nl80211_init()
* Returns: Scan results on success, -1 on failure
*/
static struct wpa_scan_results *
wpa_driver_nl80211_get_scan_results(void *priv)
{
struct wpa_driver_nl80211_data *drv = priv;
size_t ap_num = 0, len;
int first;
u8 *res_buf;
struct iw_event iwe_buf, *iwe = &iwe_buf;
char *pos, *end, *custom;
struct wpa_scan_results *res;
struct wext_scan_data data;
res_buf = wpa_driver_nl80211_giwscan(drv, &len);
if (res_buf == NULL)
return NULL;
ap_num = 0;
first = 1;
res = os_zalloc(sizeof(*res));
if (res == NULL) {
os_free(res_buf);
return NULL;
}
pos = (char *) res_buf;
end = (char *) res_buf + len;
os_memset(&data, 0, sizeof(data));
while (pos + IW_EV_LCP_LEN <= end) {
/* Event data may be unaligned, so make a local, aligned copy
* before processing. */
os_memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
if (iwe->len <= IW_EV_LCP_LEN)
break;
custom = pos + IW_EV_POINT_LEN;
if (wext_19_iw_point(drv, iwe->cmd)) {
/* WE-19 removed the pointer from struct iw_point */
char *dpos = (char *) &iwe_buf.u.data.length;
int dlen = dpos - (char *) &iwe_buf;
os_memcpy(dpos, pos + IW_EV_LCP_LEN,
sizeof(struct iw_event) - dlen);
} else {
os_memcpy(&iwe_buf, pos, sizeof(struct iw_event));
custom += IW_EV_POINT_OFF;
}
switch (iwe->cmd) {
case SIOCGIWAP:
if (!first)
wpa_driver_nl80211_add_scan_entry(res, &data);
first = 0;
os_free(data.ie);
os_memset(&data, 0, sizeof(data));
os_memcpy(data.res.bssid,
iwe->u.ap_addr.sa_data, ETH_ALEN);
break;
case SIOCGIWMODE:
wext_get_scan_mode(iwe, &data);
break;
case SIOCGIWESSID:
wext_get_scan_ssid(iwe, &data, custom, end);
break;
case SIOCGIWFREQ:
wext_get_scan_freq(iwe, &data);
break;
case IWEVQUAL:
wext_get_scan_qual(iwe, &data);
break;
case SIOCGIWENCODE:
wext_get_scan_encode(iwe, &data);
break;
case SIOCGIWRATE:
wext_get_scan_rate(iwe, &data, pos, end);
break;
case IWEVGENIE:
wext_get_scan_iwevgenie(iwe, &data, custom, end);
break;
case IWEVCUSTOM:
wext_get_scan_custom(iwe, &data, custom, end);
break;
}
pos += iwe->len;
}
os_free(res_buf);
res_buf = NULL;
if (!first)
wpa_driver_nl80211_add_scan_entry(res, &data);
os_free(data.ie);
wpa_printf(MSG_DEBUG, "Received %lu bytes of scan results (%lu BSSes)",
(unsigned long) len, (unsigned long) res->num);
return res;
}
static int wpa_driver_nl80211_get_range(void *priv)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iw_range *range;
struct iwreq iwr;
int minlen;
size_t buflen;
/*
* Use larger buffer than struct iw_range in order to allow the
* structure to grow in the future.
*/
buflen = sizeof(struct iw_range) + 500;
range = os_zalloc(buflen);
if (range == NULL)
return -1;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.data.pointer = (caddr_t) range;
iwr.u.data.length = buflen;
minlen = ((char *) &range->enc_capa) - (char *) range +
sizeof(range->enc_capa);
if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
perror("ioctl[SIOCGIWRANGE]");
os_free(range);
return -1;
} else if (iwr.u.data.length >= minlen &&
range->we_version_compiled >= 18) {
wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
"WE(source)=%d enc_capa=0x%x",
range->we_version_compiled,
range->we_version_source,
range->enc_capa);
drv->has_capability = 1;
drv->we_version_compiled = range->we_version_compiled;
if (range->enc_capa & IW_ENC_CAPA_WPA) {
drv->capa.key_mgmt |= WPA_DRIVER_CAPA_KEY_MGMT_WPA |
WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK;
}
if (range->enc_capa & IW_ENC_CAPA_WPA2) {
drv->capa.key_mgmt |= WPA_DRIVER_CAPA_KEY_MGMT_WPA2 |
WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK;
}
drv->capa.enc |= WPA_DRIVER_CAPA_ENC_WEP40 |
WPA_DRIVER_CAPA_ENC_WEP104;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_TKIP)
drv->capa.enc |= WPA_DRIVER_CAPA_ENC_TKIP;
if (range->enc_capa & IW_ENC_CAPA_CIPHER_CCMP)
drv->capa.enc |= WPA_DRIVER_CAPA_ENC_CCMP;
wpa_printf(MSG_DEBUG, " capabilities: key_mgmt 0x%x enc 0x%x",
drv->capa.key_mgmt, drv->capa.enc);
} else {
wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: too old (short) data - "
"assuming WPA is not supported");
}
os_free(range);
return 0;
}
static int wpa_driver_nl80211_set_wpa(void *priv, int enabled)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_nl80211_set_auth_param(drv, IW_AUTH_WPA_ENABLED,
enabled);
}
static int wpa_driver_nl80211_set_key(void *priv, wpa_alg alg,
const u8 *addr, int key_idx,
int set_tx, const u8 *seq,
size_t seq_len,
const u8 *key, size_t key_len)
{
struct wpa_driver_nl80211_data *drv = priv;
int err;
struct nl_msg *msg;
wpa_printf(MSG_DEBUG, "%s: alg=%d addr=%p key_idx=%d set_tx=%d "
"seq_len=%lu key_len=%lu",
__func__, alg, addr, key_idx, set_tx,
(unsigned long) seq_len, (unsigned long) key_len);
msg = nlmsg_alloc();
if (msg == NULL)
return -1;
if (alg == WPA_ALG_NONE) {
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
NL80211_CMD_DEL_KEY, 0);
} else {
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
NL80211_CMD_NEW_KEY, 0);
NLA_PUT(msg, NL80211_ATTR_KEY_DATA, key_len, key);
switch (alg) {
case WPA_ALG_WEP:
if (key_len == 5)
NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
0x000FAC01);
else
NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
0x000FAC05);
break;
case WPA_ALG_TKIP:
NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER, 0x000FAC02);
break;
case WPA_ALG_CCMP:
NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER, 0x000FAC04);
break;
default:
nlmsg_free(msg);
return -1;
}
}
if (addr && os_memcmp(addr, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
{
wpa_printf(MSG_DEBUG, " addr=" MACSTR, MAC2STR(addr));
NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
}
NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
err = send_and_recv_msgs(drv, msg, NULL, NULL);
if (err) {
wpa_printf(MSG_DEBUG, "nl80211: set_key failed; err=%d", err);
return -1;
}
if (set_tx && alg != WPA_ALG_NONE) {
msg = nlmsg_alloc();
if (msg == NULL)
return -1;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_SET_KEY, 0);
NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT_FLAG(msg, NL80211_ATTR_KEY_DEFAULT);
err = send_and_recv_msgs(drv, msg, NULL, NULL);
if (err) {
wpa_printf(MSG_DEBUG, "nl80211: set default key "
"failed; err=%d", err);
return -1;
}
}
return 0;
nla_put_failure:
return -ENOBUFS;
}
static int wpa_driver_nl80211_set_countermeasures(void *priv,
int enabled)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_TKIP_COUNTERMEASURES,
enabled);
}
static int wpa_driver_nl80211_set_drop_unencrypted(void *priv,
int enabled)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
drv->use_crypt = enabled;
return wpa_driver_nl80211_set_auth_param(drv, IW_AUTH_DROP_UNENCRYPTED,
enabled);
}
static int wpa_driver_nl80211_mlme(struct wpa_driver_nl80211_data *drv,
const u8 *addr, int cmd, int reason_code)
{
struct iwreq iwr;
struct iw_mlme mlme;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
os_memset(&mlme, 0, sizeof(mlme));
mlme.cmd = cmd;
mlme.reason_code = reason_code;
mlme.addr.sa_family = ARPHRD_ETHER;
os_memcpy(mlme.addr.sa_data, addr, ETH_ALEN);
iwr.u.data.pointer = (caddr_t) &mlme;
iwr.u.data.length = sizeof(mlme);
if (ioctl(drv->ioctl_sock, SIOCSIWMLME, &iwr) < 0) {
perror("ioctl[SIOCSIWMLME]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_deauthenticate(void *priv, const u8 *addr,
int reason_code)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_nl80211_mlme(drv, addr, IW_MLME_DEAUTH, reason_code);
}
static int wpa_driver_nl80211_disassociate(void *priv, const u8 *addr,
int reason_code)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
return wpa_driver_nl80211_mlme(drv, addr, IW_MLME_DISASSOC,
reason_code);
}
static int wpa_driver_nl80211_set_gen_ie(void *priv, const u8 *ie,
size_t ie_len)
{
struct wpa_driver_nl80211_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
iwr.u.data.pointer = (caddr_t) ie;
iwr.u.data.length = ie_len;
if (ioctl(drv->ioctl_sock, SIOCSIWGENIE, &iwr) < 0) {
perror("ioctl[SIOCSIWGENIE]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_cipher2wext(int cipher)
{
switch (cipher) {
case CIPHER_NONE:
return IW_AUTH_CIPHER_NONE;
case CIPHER_WEP40:
return IW_AUTH_CIPHER_WEP40;
case CIPHER_TKIP:
return IW_AUTH_CIPHER_TKIP;
case CIPHER_CCMP:
return IW_AUTH_CIPHER_CCMP;
case CIPHER_WEP104:
return IW_AUTH_CIPHER_WEP104;
default:
return 0;
}
}
static int wpa_driver_nl80211_keymgmt2wext(int keymgmt)
{
switch (keymgmt) {
case KEY_MGMT_802_1X:
case KEY_MGMT_802_1X_NO_WPA:
return IW_AUTH_KEY_MGMT_802_1X;
case KEY_MGMT_PSK:
return IW_AUTH_KEY_MGMT_PSK;
default:
return 0;
}
}
static int
wpa_driver_nl80211_auth_alg_fallback(struct wpa_driver_nl80211_data *drv,
struct wpa_driver_associate_params *params)
{
struct iwreq iwr;
int ret = 0;
wpa_printf(MSG_DEBUG, "WEXT: Driver did not support "
"SIOCSIWAUTH for AUTH_ALG, trying SIOCSIWENCODE");
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
/* Just changing mode, not actual keys */
iwr.u.encoding.flags = 0;
iwr.u.encoding.pointer = (caddr_t) NULL;
iwr.u.encoding.length = 0;
/*
* Note: IW_ENCODE_{OPEN,RESTRICTED} can be interpreted to mean two
* different things. Here they are used to indicate Open System vs.
* Shared Key authentication algorithm. However, some drivers may use
* them to select between open/restricted WEP encrypted (open = allow
* both unencrypted and encrypted frames; restricted = only allow
* encrypted frames).
*/
if (!drv->use_crypt) {
iwr.u.encoding.flags |= IW_ENCODE_DISABLED;
} else {
if (params->auth_alg & AUTH_ALG_OPEN_SYSTEM)
iwr.u.encoding.flags |= IW_ENCODE_OPEN;
if (params->auth_alg & AUTH_ALG_SHARED_KEY)
iwr.u.encoding.flags |= IW_ENCODE_RESTRICTED;
}
if (ioctl(drv->ioctl_sock, SIOCSIWENCODE, &iwr) < 0) {
perror("ioctl[SIOCSIWENCODE]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_associate(
void *priv, struct wpa_driver_associate_params *params)
{
struct wpa_driver_nl80211_data *drv = priv;
int ret = 0;
int allow_unencrypted_eapol;
int value;
wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
/*
* If the driver did not support SIOCSIWAUTH, fallback to
* SIOCSIWENCODE here.
*/
if (drv->auth_alg_fallback &&
wpa_driver_nl80211_auth_alg_fallback(drv, params) < 0)
ret = -1;
if (!params->bssid &&
wpa_driver_nl80211_set_bssid(drv, NULL) < 0)
ret = -1;
/* TODO: should consider getting wpa version and cipher/key_mgmt suites
* from configuration, not from here, where only the selected suite is
* available */
if (wpa_driver_nl80211_set_gen_ie(drv, params->wpa_ie, params->wpa_ie_len)
< 0)
ret = -1;
if (params->wpa_ie == NULL || params->wpa_ie_len == 0)
value = IW_AUTH_WPA_VERSION_DISABLED;
else if (params->wpa_ie[0] == WLAN_EID_RSN)
value = IW_AUTH_WPA_VERSION_WPA2;
else
value = IW_AUTH_WPA_VERSION_WPA;
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_WPA_VERSION, value) < 0)
ret = -1;
value = wpa_driver_nl80211_cipher2wext(params->pairwise_suite);
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_CIPHER_PAIRWISE, value) < 0)
ret = -1;
value = wpa_driver_nl80211_cipher2wext(params->group_suite);
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_CIPHER_GROUP, value) < 0)
ret = -1;
value = wpa_driver_nl80211_keymgmt2wext(params->key_mgmt_suite);
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_KEY_MGMT, value) < 0)
ret = -1;
value = params->key_mgmt_suite != KEY_MGMT_NONE ||
params->pairwise_suite != CIPHER_NONE ||
params->group_suite != CIPHER_NONE ||
params->wpa_ie_len;
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_PRIVACY_INVOKED, value) < 0)
ret = -1;
/* Allow unencrypted EAPOL messages even if pairwise keys are set when
* not using WPA. IEEE 802.1X specifies that these frames are not
* encrypted, but WPA encrypts them when pairwise keys are in use. */
if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
params->key_mgmt_suite == KEY_MGMT_PSK)
allow_unencrypted_eapol = 0;
else
allow_unencrypted_eapol = 1;
if (wpa_driver_nl80211_set_auth_param(drv,
IW_AUTH_RX_UNENCRYPTED_EAPOL,
allow_unencrypted_eapol) < 0)
ret = -1;
if (params->freq && wpa_driver_nl80211_set_freq(drv, params->freq) < 0)
ret = -1;
if (wpa_driver_nl80211_set_ssid(drv, params->ssid, params->ssid_len) < 0)
ret = -1;
if (params->bssid &&
wpa_driver_nl80211_set_bssid(drv, params->bssid) < 0)
ret = -1;
return ret;
}
static int wpa_driver_nl80211_set_auth_alg(void *priv, int auth_alg)
{
struct wpa_driver_nl80211_data *drv = priv;
int algs = 0, res;
if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
algs |= IW_AUTH_ALG_OPEN_SYSTEM;
if (auth_alg & AUTH_ALG_SHARED_KEY)
algs |= IW_AUTH_ALG_SHARED_KEY;
if (auth_alg & AUTH_ALG_LEAP)
algs |= IW_AUTH_ALG_LEAP;
if (algs == 0) {
/* at least one algorithm should be set */
algs = IW_AUTH_ALG_OPEN_SYSTEM;
}
res = wpa_driver_nl80211_set_auth_param(drv, IW_AUTH_80211_AUTH_ALG,
algs);
drv->auth_alg_fallback = res == -2;
return res;
}
/**
* wpa_driver_nl80211_set_mode - Set wireless mode (infra/adhoc), SIOCSIWMODE
* @priv: Pointer to private wext data from wpa_driver_nl80211_init()
* @mode: 0 = infra/BSS (associate with an AP), 1 = adhoc/IBSS
* Returns: 0 on success, -1 on failure
*/
static int wpa_driver_nl80211_set_mode(void *priv, int mode)
{
struct wpa_driver_nl80211_data *drv = priv;
int ret = -1, flags;
struct nl_msg *msg;
msg = nlmsg_alloc();
if (!msg)
return -1;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_SET_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE,
mode ? NL80211_IFTYPE_ADHOC : NL80211_IFTYPE_STATION);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
if (!ret)
return 0;
else
goto try_again;
nla_put_failure:
wpa_printf(MSG_ERROR, "nl80211: Failed to set interface mode");
return -1;
try_again:
/* mac80211 doesn't allow mode changes while the device is up, so
* take the device down, try to set the mode again, and bring the
* device back up.
*/
if (wpa_driver_nl80211_get_ifflags(drv, &flags) == 0) {
(void) wpa_driver_nl80211_set_ifflags(drv, flags & ~IFF_UP);
/* Try to set the mode again while the interface is down */
msg = nlmsg_alloc();
if (!msg)
return -1;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_SET_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE,
mode ? NL80211_IFTYPE_ADHOC :
NL80211_IFTYPE_STATION);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
if (ret) {
wpa_printf(MSG_ERROR, "Failed to set interface %s "
"mode", drv->ifname);
}
/* Ignore return value of get_ifflags to ensure that the device
* is always up like it was before this function was called.
*/
(void) wpa_driver_nl80211_get_ifflags(drv, &flags);
(void) wpa_driver_nl80211_set_ifflags(drv, flags | IFF_UP);
}
return ret;
}
static int wpa_driver_nl80211_pmksa(struct wpa_driver_nl80211_data *drv,
u32 cmd, const u8 *bssid, const u8 *pmkid)
{
struct iwreq iwr;
struct iw_pmksa pmksa;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
os_memset(&pmksa, 0, sizeof(pmksa));
pmksa.cmd = cmd;
pmksa.bssid.sa_family = ARPHRD_ETHER;
if (bssid)
os_memcpy(pmksa.bssid.sa_data, bssid, ETH_ALEN);
if (pmkid)
os_memcpy(pmksa.pmkid, pmkid, IW_PMKID_LEN);
iwr.u.data.pointer = (caddr_t) &pmksa;
iwr.u.data.length = sizeof(pmksa);
if (ioctl(drv->ioctl_sock, SIOCSIWPMKSA, &iwr) < 0) {
if (errno != EOPNOTSUPP)
perror("ioctl[SIOCSIWPMKSA]");
ret = -1;
}
return ret;
}
static int wpa_driver_nl80211_add_pmkid(void *priv, const u8 *bssid,
const u8 *pmkid)
{
struct wpa_driver_nl80211_data *drv = priv;
return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_ADD, bssid, pmkid);
}
static int wpa_driver_nl80211_remove_pmkid(void *priv, const u8 *bssid,
const u8 *pmkid)
{
struct wpa_driver_nl80211_data *drv = priv;
return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_REMOVE, bssid, pmkid);
}
static int wpa_driver_nl80211_flush_pmkid(void *priv)
{
struct wpa_driver_nl80211_data *drv = priv;
return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_FLUSH, NULL, NULL);
}
static int wpa_driver_nl80211_get_capa(void *priv,
struct wpa_driver_capa *capa)
{
struct wpa_driver_nl80211_data *drv = priv;
if (!drv->has_capability)
return -1;
os_memcpy(capa, &drv->capa, sizeof(*capa));
return 0;
}
static int wpa_driver_nl80211_set_operstate(void *priv, int state)
{
struct wpa_driver_nl80211_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s: operstate %d->%d (%s)",
__func__, drv->operstate, state, state ? "UP" : "DORMANT");
drv->operstate = state;
return wpa_driver_nl80211_send_oper_ifla(
drv, -1, state ? IF_OPER_UP : IF_OPER_DORMANT);
}
#ifdef CONFIG_CLIENT_MLME
static int wpa_driver_nl80211_open_mlme(struct wpa_driver_nl80211_data *drv)
{
if (wpa_driver_nl80211_set_userspace_mlme(drv, 1) < 0) {
wpa_printf(MSG_ERROR, "nl80211: Failed to enable userspace "
"MLME");
return -1;
}
if (wpa_driver_nl80211_create_monitor_interface(drv)) {
wpa_printf(MSG_ERROR, "nl80211: Failed to create monitor "
"interface");
return -1;
}
return 0;
}
#endif /* CONFIG_CLIENT_MLME */
static int wpa_driver_nl80211_set_param(void *priv, const char *param)
{
#ifdef CONFIG_CLIENT_MLME
struct wpa_driver_nl80211_data *drv = priv;
if (param == NULL)
return 0;
wpa_printf(MSG_DEBUG, "%s: param='%s'", __func__, param);
if (os_strstr(param, "use_mlme=1")) {
wpa_printf(MSG_DEBUG, "nl80211: Using user space MLME");
drv->capa.flags |= WPA_DRIVER_FLAGS_USER_SPACE_MLME;
if (wpa_driver_nl80211_open_mlme(drv))
return -1;
}
#endif /* CONFIG_CLIENT_MLME */
return 0;
}
#ifdef CONFIG_CLIENT_MLME
struct phy_info_arg {
u16 *num_modes;
struct wpa_hw_modes *modes;
};
static int phy_info_handler(struct nl_msg *msg, void *arg)
{
struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct phy_info_arg *phy_info = arg;
struct nlattr *tb_band[NL80211_BAND_ATTR_MAX + 1];
struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
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 },
};
struct nlattr *tb_rate[NL80211_BITRATE_ATTR_MAX + 1];
static struct nla_policy rate_policy[NL80211_BITRATE_ATTR_MAX + 1] = {
[NL80211_BITRATE_ATTR_RATE] = { .type = NLA_U32 },
[NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE] =
{ .type = NLA_FLAG },
};
struct nlattr *nl_band;
struct nlattr *nl_freq;
struct nlattr *nl_rate;
int rem_band, rem_freq, rem_rate;
struct wpa_hw_modes *mode;
int idx, mode_is_set;
nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb_msg[NL80211_ATTR_WIPHY_BANDS])
return NL_SKIP;
nla_for_each_nested(nl_band, tb_msg[NL80211_ATTR_WIPHY_BANDS],
rem_band) {
mode = os_realloc(phy_info->modes,
(*phy_info->num_modes + 1) * sizeof(*mode));
if (!mode)
return NL_SKIP;
phy_info->modes = mode;
mode_is_set = 0;
mode = &phy_info->modes[*(phy_info->num_modes)];
os_memset(mode, 0, sizeof(*mode));
*(phy_info->num_modes) += 1;
nla_parse(tb_band, NL80211_BAND_ATTR_MAX, nla_data(nl_band),
nla_len(nl_band), NULL);
nla_for_each_nested(nl_freq, tb_band[NL80211_BAND_ATTR_FREQS],
rem_freq) {
nla_parse(tb_freq, NL80211_FREQUENCY_ATTR_MAX,
nla_data(nl_freq), nla_len(nl_freq),
freq_policy);
if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ])
continue;
mode->num_channels++;
}
mode->channels = os_zalloc(mode->num_channels *
sizeof(struct wpa_channel_data));
if (!mode->channels)
return NL_SKIP;
idx = 0;
nla_for_each_nested(nl_freq, tb_band[NL80211_BAND_ATTR_FREQS],
rem_freq) {
nla_parse(tb_freq, NL80211_FREQUENCY_ATTR_MAX,
nla_data(nl_freq), nla_len(nl_freq),
freq_policy);
if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ])
continue;
mode->channels[idx].freq = nla_get_u32(
tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
mode->channels[idx].flag |= WPA_CHAN_W_SCAN |
WPA_CHAN_W_ACTIVE_SCAN |
WPA_CHAN_W_IBSS;
if (!mode_is_set) {
/* crude heuristic */
if (mode->channels[idx].freq < 4000)
mode->mode = WPA_MODE_IEEE80211B;
else
mode->mode = WPA_MODE_IEEE80211A;
mode_is_set = 1;
}
/* crude heuristic */
if (mode->channels[idx].freq < 4000) {
if (mode->channels[idx].freq == 2848)
mode->channels[idx].chan = 14;
else
mode->channels[idx].chan =
(mode->channels[idx].freq -
2407) / 5;
} else
mode->channels[idx].chan =
mode->channels[idx].freq / 5 - 1000;
if (tb_freq[NL80211_FREQUENCY_ATTR_DISABLED])
mode->channels[idx].flag &= ~WPA_CHAN_W_SCAN;
if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
mode->channels[idx].flag &=
~WPA_CHAN_W_ACTIVE_SCAN;
if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
mode->channels[idx].flag &= ~WPA_CHAN_W_IBSS;
idx++;
}
nla_for_each_nested(nl_rate, tb_band[NL80211_BAND_ATTR_RATES],
rem_rate) {
nla_parse(tb_rate, NL80211_BITRATE_ATTR_MAX,
nla_data(nl_rate), nla_len(nl_rate),
rate_policy);
if (!tb_rate[NL80211_BITRATE_ATTR_RATE])
continue;
mode->num_rates++;
}
mode->rates = os_zalloc(mode->num_rates *
sizeof(struct wpa_rate_data));
if (!mode->rates)
return NL_SKIP;
idx = 0;
nla_for_each_nested(nl_rate, tb_band[NL80211_BAND_ATTR_RATES],
rem_rate) {
nla_parse(tb_rate, NL80211_BITRATE_ATTR_MAX,
nla_data(nl_rate), nla_len(nl_rate),
rate_policy);
if (!tb_rate[NL80211_BITRATE_ATTR_RATE])
continue;
mode->rates[idx].rate = nla_get_u32(
tb_rate[NL80211_BITRATE_ATTR_RATE]);
/* crude heuristic */
if (mode->mode == WPA_MODE_IEEE80211B &&
mode->rates[idx].rate > 200)
mode->mode = WPA_MODE_IEEE80211G;
if (tb_rate[NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE])
mode->rates[idx].flags |= WPA_RATE_PREAMBLE2;
idx++;
}
}
return NL_SKIP;
}
static struct wpa_hw_modes *
wpa_driver_nl80211_get_hw_feature_data(void *priv, u16 *num_modes, u16 *flags)
{
struct wpa_driver_nl80211_data *drv = priv;
struct nl_msg *msg;
struct phy_info_arg result = {
.num_modes = num_modes,
.modes = NULL,
};
*num_modes = 0;
*flags = 0;
msg = nlmsg_alloc();
if (!msg)
return NULL;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_GET_WIPHY, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
if (send_and_recv_msgs(drv, msg, phy_info_handler, &result) == 0)
return result.modes;
nla_put_failure:
return NULL;
}
static int wpa_driver_nl80211_set_channel(void *priv, wpa_hw_mode phymode,
int chan, int freq)
{
return wpa_driver_nl80211_set_freq(priv, freq);
}
static int wpa_driver_nl80211_send_mlme(void *priv, const u8 *data,
size_t data_len)
{
struct wpa_driver_nl80211_data *drv = priv;
__u8 rtap_hdr[] = {
0x00, 0x00, /* radiotap version */
0x0e, 0x00, /* radiotap length */
0x02, 0xc0, 0x00, 0x00, /* bmap: flags, tx and rx flags */
0x0c, /* F_WEP | F_FRAG (encrypt/fragment if required) */
0x00, /* padding */
0x00, 0x00, /* RX and TX flags to indicate that */
0x00, 0x00, /* this is the injected frame directly */
};
struct iovec iov[2] = {
{
.iov_base = &rtap_hdr,
.iov_len = sizeof(rtap_hdr),
},
{
.iov_base = (void *) data,
.iov_len = data_len,
}
};
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = iov,
.msg_iovlen = 2,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0,
};
if (sendmsg(drv->monitor_sock, &msg, 0) < 0) {
perror("send[MLME]");
return -1;
}
return 0;
}
static int wpa_driver_nl80211_mlme_add_sta(void *priv, const u8 *addr,
const u8 *supp_rates,
size_t supp_rates_len)
{
struct wpa_driver_nl80211_data *drv = priv;
struct nl_msg *msg;
int ret = -1;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_NEW_STATION, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
/* TODO: Get proper Association ID and listen interval */
NLA_PUT_U16(msg, NL80211_ATTR_STA_AID, 1);
NLA_PUT(msg, NL80211_ATTR_STA_SUPPORTED_RATES, supp_rates_len,
supp_rates);
NLA_PUT_U16(msg, NL80211_ATTR_STA_LISTEN_INTERVAL, 1);
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
/* ignore EEXIST, this happens if a STA associates while associated */
if (ret == -EEXIST || ret >= 0)
ret = 0;
nla_put_failure:
return ret;
}
static int wpa_driver_nl80211_mlme_remove_sta(void *priv, const u8 *addr)
{
struct wpa_driver_nl80211_data *drv = priv;
struct nl_msg *msg;
int ret = -1;
msg = nlmsg_alloc();
if (!msg)
return -ENOMEM;
genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
0, NL80211_CMD_DEL_STATION, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
ret = 0;
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
return ret;
nla_put_failure:
return -ENOBUFS;
}
#endif /* CONFIG_CLIENT_MLME */
const struct wpa_driver_ops wpa_driver_nl80211_ops = {
.name = "nl80211",
.desc = "Linux nl80211/cfg80211",
.get_bssid = wpa_driver_nl80211_get_bssid,
.get_ssid = wpa_driver_nl80211_get_ssid,
.set_wpa = wpa_driver_nl80211_set_wpa,
.set_key = wpa_driver_nl80211_set_key,
.set_countermeasures = wpa_driver_nl80211_set_countermeasures,
.set_drop_unencrypted = wpa_driver_nl80211_set_drop_unencrypted,
.scan = wpa_driver_nl80211_scan,
.get_scan_results2 = wpa_driver_nl80211_get_scan_results,
.deauthenticate = wpa_driver_nl80211_deauthenticate,
.disassociate = wpa_driver_nl80211_disassociate,
.set_mode = wpa_driver_nl80211_set_mode,
.associate = wpa_driver_nl80211_associate,
.set_auth_alg = wpa_driver_nl80211_set_auth_alg,
.init = wpa_driver_nl80211_init,
.deinit = wpa_driver_nl80211_deinit,
.set_param = wpa_driver_nl80211_set_param,
.add_pmkid = wpa_driver_nl80211_add_pmkid,
.remove_pmkid = wpa_driver_nl80211_remove_pmkid,
.flush_pmkid = wpa_driver_nl80211_flush_pmkid,
.get_capa = wpa_driver_nl80211_get_capa,
.set_operstate = wpa_driver_nl80211_set_operstate,
.set_country = wpa_driver_nl80211_set_country,
.set_probe_req_ie = wpa_driver_nl80211_set_probe_req_ie,
#ifdef CONFIG_CLIENT_MLME
.get_hw_feature_data = wpa_driver_nl80211_get_hw_feature_data,
.set_channel = wpa_driver_nl80211_set_channel,
.set_ssid = wpa_driver_nl80211_set_ssid,
.set_bssid = wpa_driver_nl80211_set_bssid,
.send_mlme = wpa_driver_nl80211_send_mlme,
.mlme_add_sta = wpa_driver_nl80211_mlme_add_sta,
.mlme_remove_sta = wpa_driver_nl80211_mlme_remove_sta,
#endif /* CONFIG_CLIENT_MLME */
};
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