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driver_wext.c
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driver_wext.c
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/*
* WPA Supplicant - driver interaction with generic Linux Wireless Extensions
* Copyright (c) 2003-2007, 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.
*
* This file implements a driver interface for the Linux Wireless Extensions.
* When used with WE-18 or newer, this interface can be used as-is with number
* of drivers. In addition to this, some of the common functions in this file
* can be used by other driver interface implementations that use generic WE
* ioctls, but require private ioctls for some of the functionality.
*/
#include "includes.h"
#include <sys/ioctl.h>
#include <net/if_arp.h>
#include <net/if.h>
#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "l2_packet.h"
#include "eloop.h"
#include "wpa_supplicant.h"
#include "priv_netlink.h"
#include "driver_wext.h"
#include "wpa.h"
#include "wpa_ctrl.h"
#include "wpa_supplicant_i.h"
#include "config_ssid.h"
#ifdef CONFIG_CLIENT_MLME
#include <netpacket/packet.h>
#include <hostapd_ioctl.h>
#include <ieee80211_common.h>
/* from net/mac80211.h */
enum {
MODE_IEEE80211A = 0 /* IEEE 802.11a */,
MODE_IEEE80211B = 1 /* IEEE 802.11b only */,
MODE_ATHEROS_TURBO = 2 /* Atheros Turbo mode (2x.11a at 5 GHz) */,
MODE_IEEE80211G = 3 /* IEEE 802.11g (and 802.11b compatibility) */,
MODE_ATHEROS_TURBOG = 4 /* Atheros Turbo mode (2x.11g at 2.4 GHz) */,
NUM_IEEE80211_MODES = 5
};
#include "mlme.h"
#ifndef ETH_P_ALL
#define ETH_P_ALL 0x0003
#endif
#endif /* CONFIG_CLIENT_MLME */
struct wpa_driver_wext_data {
void *ctx;
int event_sock;
int ioctl_sock;
int mlme_sock;
char ifname[IFNAMSIZ + 1];
int ifindex;
int ifindex2;
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;
int errors;
};
static int wpa_driver_wext_flush_pmkid(void *priv);
static int wpa_driver_wext_get_range(void *priv);
static void wpa_driver_wext_finish_drv_init(struct wpa_driver_wext_data *drv);
static int wpa_driver_wext_send_oper_ifla(struct wpa_driver_wext_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;
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_wext_set_auth_param(struct wpa_driver_wext_data *drv,
int idx, u32 value)
{
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(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;
}
/**
* wpa_driver_wext_get_bssid - Get BSSID, SIOCGIWAP
* @priv: Pointer to private wext data from wpa_driver_wext_init()
* @bssid: Buffer for BSSID
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_get_bssid(void *priv, u8 *bssid)
{
struct wpa_driver_wext_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(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;
}
/**
* wpa_driver_wext_set_bssid - Set BSSID, SIOCSIWAP
* @priv: Pointer to private wext data from wpa_driver_wext_init()
* @bssid: BSSID
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_set_bssid(void *priv, const u8 *bssid)
{
struct wpa_driver_wext_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(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;
}
/**
* wpa_driver_wext_get_ssid - Get SSID, SIOCGIWESSID
* @priv: Pointer to private wext data from wpa_driver_wext_init()
* @ssid: Buffer for the SSID; must be at least 32 bytes long
* Returns: SSID length on success, -1 on failure
*/
int wpa_driver_wext_get_ssid(void *priv, u8 *ssid)
{
struct wpa_driver_wext_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(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;
}
/**
* wpa_driver_wext_set_ssid - Set SSID, SIOCSIWESSID
* @priv: Pointer to private wext data from wpa_driver_wext_init()
* @ssid: SSID
* @ssid_len: Length of SSID (0..32)
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_set_ssid(void *priv, const u8 *ssid, size_t ssid_len)
{
struct wpa_driver_wext_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_strncpy(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;
}
/**
* wpa_driver_wext_set_freq - Set frequency/channel, SIOCSIWFREQ
* @priv: Pointer to private wext data from wpa_driver_wext_init()
* @freq: Frequency in MHz
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_set_freq(void *priv, int freq)
{
struct wpa_driver_wext_data *drv = priv;
struct iwreq iwr;
int ret = 0;
os_memset(&iwr, 0, sizeof(iwr));
os_strncpy(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_wext_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 */
#ifdef ANDROID
} else if (os_strncmp(custom, "STOP", 4) == 0) {
wpa_msg(ctx, MSG_INFO, WPA_EVENT_DRIVER_STATE "STOPPED");
} else if (os_strncmp(custom, "START", 5) == 0) {
wpa_msg(ctx, MSG_INFO, WPA_EVENT_DRIVER_STATE "STARTED");
#endif /* ANDROID */
}
}
static int wpa_driver_wext_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_wext_event_wireless_pmkidcand(
struct wpa_driver_wext_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_wext_event_wireless_assocreqie(
struct wpa_driver_wext_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_wext_event_wireless_assocrespie(
struct wpa_driver_wext_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_wext_event_assoc_ies(struct wpa_driver_wext_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_wext_event_wireless(struct wpa_driver_wext_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 (os_memcmp(iwe->u.ap_addr.sa_data,
"\x00\x00\x00\x00\x00\x00", ETH_ALEN) ==
0 ||
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_wext_event_assoc_ies(drv);
wpa_supplicant_event(ctx, EVENT_ASSOC, NULL);
}
break;
case IWEVMICHAELMICFAILURE:
if (custom + iwe->u.data.length > end) {
wpa_printf(MSG_DEBUG, "WEXT: Invalid "
"IWEVMICHAELMICFAILURE length");
return;
}
wpa_driver_wext_event_wireless_michaelmicfailure(
ctx, custom, iwe->u.data.length);
break;
case IWEVCUSTOM:
if (custom + iwe->u.data.length > end) {
wpa_printf(MSG_DEBUG, "WEXT: Invalid "
"IWEVCUSTOM length");
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_wext_event_wireless_custom(ctx, buf);
os_free(buf);
break;
case SIOCGIWSCAN:
drv->scan_complete_events = 1;
eloop_cancel_timeout(wpa_driver_wext_scan_timeout,
drv, ctx);
wpa_supplicant_event(ctx, EVENT_SCAN_RESULTS, NULL);
break;
case IWEVASSOCREQIE:
if (custom + iwe->u.data.length > end) {
wpa_printf(MSG_DEBUG, "WEXT: Invalid "
"IWEVASSOCREQIE length");
return;
}
wpa_driver_wext_event_wireless_assocreqie(
drv, custom, iwe->u.data.length);
break;
case IWEVASSOCRESPIE:
if (custom + iwe->u.data.length > end) {
wpa_printf(MSG_DEBUG, "WEXT: Invalid "
"IWEVASSOCRESPIE length");
return;
}
wpa_driver_wext_event_wireless_assocrespie(
drv, custom, iwe->u.data.length);
break;
case IWEVPMKIDCAND:
if (custom + iwe->u.data.length > end) {
wpa_printf(MSG_DEBUG, "WEXT: Invalid "
"IWEVPMKIDCAND length");
return;
}
wpa_driver_wext_event_wireless_pmkidcand(
drv, custom, iwe->u.data.length);
break;
}
pos += iwe->len;
}
}
static void wpa_driver_wext_event_link(struct wpa_driver_wext_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_wext_own_ifname(struct wpa_driver_wext_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_wext_own_ifindex(struct wpa_driver_wext_data *drv,
int ifindex, struct nlmsghdr *h)
{
if (drv->ifindex == ifindex || drv->ifindex2 == ifindex)
return 1;
if (drv->if_removed && wpa_driver_wext_own_ifname(drv, h)) {
drv->ifindex = if_nametoindex(drv->ifname);
wpa_printf(MSG_DEBUG, "WEXT: Update ifindex for a removed "
"interface");
wpa_driver_wext_finish_drv_init(drv);
return 1;
}
return 0;
}
static void wpa_driver_wext_event_rtm_newlink(struct wpa_driver_wext_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_wext_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_wext_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_wext_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_wext_event_wireless(
drv, ctx, ((char *) attr) + rta_len,
attr->rta_len - rta_len);
} else if (attr->rta_type == IFLA_IFNAME) {
wpa_driver_wext_event_link(drv, ctx,
((char *) attr) + rta_len,
attr->rta_len - rta_len, 0);
}
attr = RTA_NEXT(attr, attrlen);
}
}
static void wpa_driver_wext_event_rtm_dellink(struct wpa_driver_wext_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_wext_event_link(drv, ctx,
((char *) attr) + rta_len,
attr->rta_len - rta_len, 1);
}
attr = RTA_NEXT(attr, attrlen);
}
}
static void wpa_driver_wext_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_wext_event_rtm_newlink(eloop_ctx, sock_ctx,
h, plen);
break;
case RTM_DELLINK:
wpa_driver_wext_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_wext_get_ifflags_ifname(struct wpa_driver_wext_data *drv,
const char *ifname, int *flags)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(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_wext_get_ifflags - Get interface flags (SIOCGIFFLAGS)
* @drv: driver_wext private data
* @flags: Pointer to returned flags value
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_get_ifflags(struct wpa_driver_wext_data *drv, int *flags)
{
return wpa_driver_wext_get_ifflags_ifname(drv, drv->ifname, flags);
}
static int wpa_driver_wext_set_ifflags_ifname(struct wpa_driver_wext_data *drv,
const char *ifname, int flags)
{
struct ifreq ifr;
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(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_wext_set_ifflags - Set interface flags (SIOCSIFFLAGS)
* @drv: driver_wext private data
* @flags: New value for flags
* Returns: 0 on success, -1 on failure
*/
int wpa_driver_wext_set_ifflags(struct wpa_driver_wext_data *drv, int flags)
{
return wpa_driver_wext_set_ifflags_ifname(drv, drv->ifname, flags);
}
/**
* wpa_driver_wext_init - Initialize WE 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
*/
void * wpa_driver_wext_init(void *ctx, const char *ifname)
{
int s;
struct sockaddr_nl local;
struct wpa_driver_wext_data *drv;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
return NULL;
drv->ctx = ctx;
os_strncpy(drv->ifname, ifname, sizeof(drv->ifname));
drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
if (drv->ioctl_sock < 0) {
perror("socket(PF_INET,SOCK_DGRAM)");
os_free(drv);
return NULL;
}
s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (s < 0) {
perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
close(drv->ioctl_sock);
os_free(drv);
return NULL;
}
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);
close(drv->ioctl_sock);
os_free(drv);
return NULL;
}
eloop_register_read_sock(s, wpa_driver_wext_event_receive, drv, ctx);