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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.
*/
#include "includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#ifdef __linux__
#include <netpacket/packet.h>
#endif /* __linux__ */
#ifdef __FreeBSD__
#include <net/if_dl.h>
#endif /* __FreeBSD__ */
#include "common.h"
#include "driver.h"
#include "wpa_supplicant.h"
static const u8 pae_group_addr[ETH_ALEN] =
{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
struct wpa_driver_wired_data {
void *ctx;
int pf_sock;
char ifname[IFNAMSIZ + 1];
int membership, multi, iff_allmulti, iff_up;
};
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 wpa_driver_wired_get_ifflags(const char *ifname, int *flags)
{
struct ifreq ifr;
int s;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return -1;
}
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
perror("ioctl[SIOCGIFFLAGS]");
close(s);
return -1;
}
close(s);
*flags = ifr.ifr_flags & 0xffff;
return 0;
}
static int wpa_driver_wired_set_ifflags(const char *ifname, int flags)
{
struct ifreq ifr;
int s;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return -1;
}
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
ifr.ifr_flags = flags & 0xffff;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
perror("ioctl[SIOCSIFFLAGS]");
close(s);
return -1;
}
close(s);
return 0;
}
static int wpa_driver_wired_multi(const char *ifname, const u8 *addr, int add)
{
struct ifreq ifr;
int s;
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return -1;
}
os_memset(&ifr, 0, sizeof(ifr));
os_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
#ifdef __linux__
ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
#endif /* __linux__ */
#ifdef __FreeBSD__
{
struct sockaddr_dl *dlp;
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);
}
#endif /* __FreeBSD__ */
if (ioctl(s, add ? SIOCADDMULTI : SIOCDELMULTI, (caddr_t) &ifr) < 0) {
perror("ioctl[SIOC{ADD/DEL}MULTI]");
close(s);
return -1;
}
close(s);
return 0;
}
static int wpa_driver_wired_membership(struct wpa_driver_wired_data *drv,
const u8 *addr, int add)
{
#ifdef __linux__
struct packet_mreq mreq;
if (drv->pf_sock == -1)
return -1;
os_memset(&mreq, 0, sizeof(mreq));
mreq.mr_ifindex = if_nametoindex(drv->ifname);
mreq.mr_type = PACKET_MR_MULTICAST;
mreq.mr_alen = ETH_ALEN;
os_memcpy(mreq.mr_address, addr, ETH_ALEN);
if (setsockopt(drv->pf_sock, SOL_PACKET,
add ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP,
&mreq, sizeof(mreq)) < 0) {
perror("setsockopt");
return -1;
}
return 0;
#else /* __linux__ */
return -1;
#endif /* __linux__ */
}
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->ctx = ctx;
#ifdef __linux__
drv->pf_sock = socket(PF_PACKET, SOCK_DGRAM, 0);
if (drv->pf_sock < 0)
perror("socket(PF_PACKET)");
#else /* __linux__ */
drv->pf_sock = -1;
#endif /* __linux__ */
if (wpa_driver_wired_get_ifflags(ifname, &flags) == 0 &&
!(flags & IFF_UP) &&
wpa_driver_wired_set_ifflags(ifname, flags | IFF_UP) == 0) {
drv->iff_up = 1;
}
if (wpa_driver_wired_membership(drv, pae_group_addr, 1) == 0) {
wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
"packet socket", __func__);
drv->membership = 1;
} else if (wpa_driver_wired_multi(ifname, pae_group_addr, 1) == 0) {
wpa_printf(MSG_DEBUG, "%s: Added multicast membership with "
"SIOCADDMULTI", __func__);
drv->multi = 1;
} else if (wpa_driver_wired_get_ifflags(ifname, &flags) < 0) {
wpa_printf(MSG_INFO, "%s: Could not get interface "
"flags", __func__);
os_free(drv);
return NULL;
} else if (flags & IFF_ALLMULTI) {
wpa_printf(MSG_DEBUG, "%s: Interface is already configured "
"for multicast", __func__);
} else if (wpa_driver_wired_set_ifflags(ifname,
flags | IFF_ALLMULTI) < 0) {
wpa_printf(MSG_INFO, "%s: Failed to enable allmulti",
__func__);
os_free(drv);
return NULL;
} else {
wpa_printf(MSG_DEBUG, "%s: Enabled allmulti mode",
__func__);
drv->iff_allmulti = 1;
}
return drv;
}
static void wpa_driver_wired_deinit(void *priv)
{
struct wpa_driver_wired_data *drv = priv;
int flags;
if (drv->membership &&
wpa_driver_wired_membership(drv, pae_group_addr, 0) < 0) {
wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
"group (PACKET)", __func__);
}
if (drv->multi &&
wpa_driver_wired_multi(drv->ifname, pae_group_addr, 0) < 0) {
wpa_printf(MSG_DEBUG, "%s: Failed to remove PAE multicast "
"group (SIOCDELMULTI)", __func__);
}
if (drv->iff_allmulti &&
(wpa_driver_wired_get_ifflags(drv->ifname, &flags) < 0 ||
wpa_driver_wired_set_ifflags(drv->ifname,
flags & ~IFF_ALLMULTI) < 0)) {
wpa_printf(MSG_DEBUG, "%s: Failed to disable allmulti mode",
__func__);
}
if (drv->iff_up &&
wpa_driver_wired_get_ifflags(drv->ifname, &flags) == 0 &&
(flags & IFF_UP) &&
wpa_driver_wired_set_ifflags(drv->ifname, flags & ~IFF_UP) < 0) {
wpa_printf(MSG_DEBUG, "%s: Failed to set the interface down",
__func__);
}
if (drv->pf_sock != -1)
close(drv->pf_sock);
os_free(drv);
}
const struct wpa_driver_ops wpa_driver_wired_ops = {
.name = "wired",
.desc = "wpa_supplicant 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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