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/*
* WPA Supplicant - wired Ethernet driver interface
* Copyright (c) 2005-2007, 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.
*
* $FreeBSD$
*/
#include "includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include "common.h"
#include "driver.h"
#include "wpa.h"
static const u8 pae_group_addr[ETH_ALEN] =
{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
struct wpa_driver_wired_data {
int sock;
char ifname[IFNAMSIZ + 1];
int multi;
int flags;
void *ctx;
};
static int
getifflags(struct wpa_driver_wired_data *drv, int *flags)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, drv->ifname, sizeof (ifr.ifr_name));
if (ioctl(drv->sock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
perror("SIOCGIFFLAGS");
return errno;
}
*flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);
return 0;
}
static int
setifflags(struct wpa_driver_wired_data *drv, int flags)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, drv->ifname, sizeof (ifr.ifr_name));
ifr.ifr_flags = flags & 0xffff;
ifr.ifr_flagshigh = flags >> 16;
if (ioctl(drv->sock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
perror("SIOCSIFFLAGS");
return errno;
}
return 0;
}
static int
wpa_driver_wired_get_ssid(void *priv, u8 *ssid)
{
ssid[0] = 0;
return 0;
}
static int
wpa_driver_wired_get_bssid(void *priv, u8 *bssid)
{
/* Report PAE group address as the "BSSID" for wired connection. */
os_memcpy(bssid, pae_group_addr, ETH_ALEN);
return 0;
}
static int
siocmulti(struct wpa_driver_wired_data *drv, int op, const u8 *addr)
{
struct ifreq ifr;
struct sockaddr_dl *dlp;
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(ifr.ifr_name, drv->ifname, IFNAMSIZ);
dlp = (struct sockaddr_dl *) &ifr.ifr_addr;
dlp->sdl_len = sizeof(struct sockaddr_dl);
dlp->sdl_family = AF_LINK;
dlp->sdl_index = 0;
dlp->sdl_nlen = 0;
dlp->sdl_alen = ETH_ALEN;
dlp->sdl_slen = 0;
os_memcpy(LLADDR(dlp), addr, ETH_ALEN);
if (ioctl(drv->sock, op, (caddr_t) &ifr) < 0) {
wpa_printf(MSG_INFO, "ioctl[%s]: %s", op == SIOCADDMULTI ?
"SIOCADDMULTI" : "SIOCDELMULTI", strerror(errno));
return -1;
}
return 0;
}
static void *
wpa_driver_wired_init(void *ctx, const char *ifname)
{
struct wpa_driver_wired_data *drv;
int flags;
drv = os_zalloc(sizeof(*drv));
if (drv == NULL)
return NULL;
os_strncpy(drv->ifname, ifname, sizeof(drv->ifname));
drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
if (drv->sock < 0)
goto fail1;
drv->ctx = ctx;
if (getifflags(drv, &drv->flags) < 0) {
wpa_printf(MSG_INFO, "%s: Unable to get interface flags",
__func__);
goto fail;
}
flags = drv->flags | IFF_UP; /* NB: force interface up */
/*
* Arrange to receive PAE mcast frames. Try to add an
* explicit mcast address. If that fails, fallback to
* the all multicast mechanism.
*/
if (siocmulti(drv, SIOCADDMULTI, pae_group_addr) == 0) {
wpa_printf(MSG_DEBUG, "%s: Added PAE multicast address",
__func__);
drv->multi = 1;
} else if ((drv->flags & IFF_ALLMULTI) == 0)
flags |= IFF_ALLMULTI;
if (flags != drv->flags) {
if (setifflags(drv, flags) < 0) {
wpa_printf(MSG_INFO, "%s: Failed to set interface flags",
__func__);
goto fail;
}
if ((flags ^ drv->flags) & IFF_ALLMULTI)
wpa_printf(MSG_DEBUG, "%s: Enabled all-multi mode",
__func__);
}
return drv;
fail:
close(drv->sock);
fail1:
free(drv);
return NULL;
}
static void
wpa_driver_wired_deinit(void *priv)
{
struct wpa_driver_wired_data *drv = priv;
if (drv->multi) {
if (siocmulti(drv, SIOCDELMULTI, pae_group_addr) < 0) {
wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE "
"multicast " "group (SIOCDELMULTI)", __func__);
}
}
if (setifflags(drv, drv->flags) < 0) {
wpa_printf(MSG_INFO, "%s: Failed to restore interface flags",
__func__);
}
(void) close(drv->sock);
os_free(drv);
}
const struct wpa_driver_ops wpa_driver_wired_ops = {
.name = "wired",
.desc = "BSD wired Ethernet driver",
.get_ssid = wpa_driver_wired_get_ssid,
.get_bssid = wpa_driver_wired_get_bssid,
.init = wpa_driver_wired_init,
.deinit = wpa_driver_wired_deinit,
};
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