krackattacks/src/drivers/driver_wired_common.c

/*
 * Common functions for Wired Ethernet driver interfaces
 * Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2004, Gunter Burchardt <tira@isx.de>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "eloop.h"
#include "driver.h"
#include "driver_wired_common.h"

#include <sys/ioctl.h>
#include <net/if.h>
#ifdef __linux__
#include <netpacket/packet.h>
#include <net/if_arp.h>
#include <net/if.h>
#endif /* __linux__ */
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
#include <net/if_dl.h>
#include <net/if_media.h>
#endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__) */
#ifdef __sun__
#include <sys/sockio.h>
#endif /* __sun__ */


static int driver_wired_get_ifflags(const char *ifname, int *flags)
{
	struct ifreq ifr;
	int s;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		wpa_printf(MSG_ERROR, "socket: %s", strerror(errno));
		return -1;
	}

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
	if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
		wpa_printf(MSG_ERROR, "ioctl[SIOCGIFFLAGS]: %s",
			   strerror(errno));
		close(s);
		return -1;
	}
	close(s);
	*flags = ifr.ifr_flags & 0xffff;
	return 0;
}


static int driver_wired_set_ifflags(const char *ifname, int flags)
{
	struct ifreq ifr;
	int s;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		wpa_printf(MSG_ERROR, "socket: %s", strerror(errno));
		return -1;
	}

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
	ifr.ifr_flags = flags & 0xffff;
	if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
		wpa_printf(MSG_ERROR, "ioctl[SIOCSIFFLAGS]: %s",
			   strerror(errno));
		close(s);
		return -1;
	}
	close(s);
	return 0;
}


static int driver_wired_multi(const char *ifname, const u8 *addr, int add)
{
	struct ifreq ifr;
	int s;

#ifdef __sun__
	return -1;
#endif /* __sun__ */

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		wpa_printf(MSG_ERROR, "socket: %s", strerror(errno));
		return -1;
	}

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(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__ */
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
	{
		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 /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(FreeBSD_kernel__) */
#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
	{
		struct sockaddr *sap;

		sap = (struct sockaddr *) &ifr.ifr_addr;
		sap->sa_len = sizeof(struct sockaddr);
		sap->sa_family = AF_UNSPEC;
		os_memcpy(sap->sa_data, addr, ETH_ALEN);
	}
#endif /* defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__) */

	if (ioctl(s, add ? SIOCADDMULTI : SIOCDELMULTI, (caddr_t) &ifr) < 0) {
		wpa_printf(MSG_ERROR, "ioctl[SIOC{ADD/DEL}MULTI]: %s",
			   strerror(errno));
		close(s);
		return -1;
	}
	close(s);
	return 0;
}


int wired_multicast_membership(int sock, int ifindex, const u8 *addr, int add)
{
#ifdef __linux__
	struct packet_mreq mreq;

	if (sock < 0)
		return -1;

	os_memset(&mreq, 0, sizeof(mreq));
	mreq.mr_ifindex = ifindex;
	mreq.mr_type = PACKET_MR_MULTICAST;
	mreq.mr_alen = ETH_ALEN;
	os_memcpy(mreq.mr_address, addr, ETH_ALEN);

	if (setsockopt(sock, SOL_PACKET,
		       add ? PACKET_ADD_MEMBERSHIP : PACKET_DROP_MEMBERSHIP,
		       &mreq, sizeof(mreq)) < 0) {
		wpa_printf(MSG_ERROR, "setsockopt: %s", strerror(errno));
		return -1;
	}
	return 0;
#else /* __linux__ */
	return -1;
#endif /* __linux__ */
}


int driver_wired_get_ssid(void *priv, u8 *ssid)
{
	ssid[0] = 0;
	return 0;
}


int 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;
}


int driver_wired_get_capa(void *priv, struct wpa_driver_capa *capa)
{
	os_memset(capa, 0, sizeof(*capa));
	capa->flags = WPA_DRIVER_FLAGS_WIRED;
	return 0;
}


#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
static int driver_wired_get_ifstatus(const char *ifname, int *status)
{
	struct ifmediareq ifmr;
	int s;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		wpa_printf(MSG_ERROR, "socket: %s", strerror(errno));
		return -1;
	}

	os_memset(&ifmr, 0, sizeof(ifmr));
	os_strlcpy(ifmr.ifm_name, ifname, IFNAMSIZ);
	if (ioctl(s, SIOCGIFMEDIA, (caddr_t) &ifmr) < 0) {
		wpa_printf(MSG_ERROR, "ioctl[SIOCGIFMEDIA]: %s",
			   strerror(errno));
		close(s);
		return -1;
	}
	close(s);
	*status = (ifmr.ifm_status & (IFM_ACTIVE | IFM_AVALID)) ==
		(IFM_ACTIVE | IFM_AVALID);

	return 0;
}
#endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(FreeBSD_kernel__) */


int driver_wired_init_common(struct driver_wired_common_data *common,
			     const char *ifname, void *ctx)
{
	int flags;

	os_strlcpy(common->ifname, ifname, sizeof(common->ifname));
	common->ctx = ctx;

#ifdef __linux__
	common->pf_sock = socket(PF_PACKET, SOCK_DGRAM, 0);
	if (common->pf_sock < 0)
		wpa_printf(MSG_ERROR, "socket(PF_PACKET): %s", strerror(errno));
#else /* __linux__ */
	common->pf_sock = -1;
#endif /* __linux__ */

	if (driver_wired_get_ifflags(ifname, &flags) == 0 &&
	    !(flags & IFF_UP) &&
	    driver_wired_set_ifflags(ifname, flags | IFF_UP) == 0)
		common->iff_up = 1;

	if (wired_multicast_membership(common->pf_sock,
				       if_nametoindex(common->ifname),
				       pae_group_addr, 1) == 0) {
		wpa_printf(MSG_DEBUG,
			   "%s: Added multicast membership with packet socket",
			   __func__);
		common->membership = 1;
	} else if (driver_wired_multi(ifname, pae_group_addr, 1) == 0) {
		wpa_printf(MSG_DEBUG,
			   "%s: Added multicast membership with SIOCADDMULTI",
			   __func__);
		common->multi = 1;
	} else if (driver_wired_get_ifflags(ifname, &flags) < 0) {
		wpa_printf(MSG_INFO, "%s: Could not get interface flags",
			   __func__);
		return -1;
	} else if (flags & IFF_ALLMULTI) {
		wpa_printf(MSG_DEBUG,
			   "%s: Interface is already configured for multicast",
			   __func__);
	} else if (driver_wired_set_ifflags(ifname,
						flags | IFF_ALLMULTI) < 0) {
		wpa_printf(MSG_INFO, "%s: Failed to enable allmulti", __func__);
		return -1;
	} else {
		wpa_printf(MSG_DEBUG, "%s: Enabled allmulti mode", __func__);
		common->iff_allmulti = 1;
	}
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
	{
		int status;

		wpa_printf(MSG_DEBUG, "%s: waiting for link to become active",
			   __func__);
		while (driver_wired_get_ifstatus(ifname, &status) == 0 &&
		       status == 0)
			sleep(1);
	}
#endif /* defined(__FreeBSD__) || defined(__DragonFly__) || defined(FreeBSD_kernel__) */

	return 0;
}


void driver_wired_deinit_common(struct driver_wired_common_data *common)
{
	int flags;

	if (common->membership &&
	    wired_multicast_membership(common->pf_sock,
				       if_nametoindex(common->ifname),
				       pae_group_addr, 0) < 0) {
		wpa_printf(MSG_DEBUG,
			   "%s: Failed to remove PAE multicast group (PACKET)",
			   __func__);
	}

	if (common->multi &&
	    driver_wired_multi(common->ifname, pae_group_addr, 0) < 0) {
		wpa_printf(MSG_DEBUG,
			   "%s: Failed to remove PAE multicast group (SIOCDELMULTI)",
			   __func__);
	}

	if (common->iff_allmulti &&
	    (driver_wired_get_ifflags(common->ifname, &flags) < 0 ||
	     driver_wired_set_ifflags(common->ifname,
				      flags & ~IFF_ALLMULTI) < 0)) {
		wpa_printf(MSG_DEBUG, "%s: Failed to disable allmulti mode",
			   __func__);
	}

	if (common->iff_up &&
	    driver_wired_get_ifflags(common->ifname, &flags) == 0 &&
	    (flags & IFF_UP) &&
	    driver_wired_set_ifflags(common->ifname, flags & ~IFF_UP) < 0) {
		wpa_printf(MSG_DEBUG, "%s: Failed to set the interface down",
			   __func__);
	}

	if (common->pf_sock != -1)
		close(common->pf_sock);
}