src/l2_packet/l2_packet_winpcap.c - vendor/opensource/hostap - Git at Google

 /*
  * WPA Supplicant - Layer2 packet handling with WinPcap RX thread
  * Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
  *
  * This l2_packet implementation is explicitly for WinPcap and Windows events.
  * l2_packet_pcap.c has support for WinPcap, but it requires polling to receive
  * frames which means relatively long latency for EAPOL RX processing. The
  * implementation here uses a separate thread to allow WinPcap to be receiving
  * all the time to reduce latency for EAPOL receiving from about 100 ms to 3 ms
  * when comparing l2_packet_pcap.c to l2_packet_winpcap.c. Extra sleep of 50 ms
  * is added in to receive thread whenever no EAPOL frames has been received for
  * a while. Whenever an EAPOL handshake is expected, this sleep is removed.
  *
  * The RX thread receives a frame and signals main thread through Windows event
  * about the availability of a new frame. Processing the received frame is
  * synchronized with pair of Windows events so that no extra buffer or queuing
  * mechanism is needed. This implementation requires Windows specific event
  * loop implementation, i.e., eloop_win.c.
  *
  * WinPcap has pcap_getevent() that could, in theory at least, be used to
  * implement this kind of waiting with a simpler single-thread design. However,
  * that event handle is not really signaled immediately when receiving each
  * frame, so it does not really work for this kind of use.
  */

 #include "includes.h"
 #include <pcap.h>

 #include "common.h"
 #include "eloop.h"
 #include "l2_packet.h"


 static const u8 pae_group_addr[ETH_ALEN] =
 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };

 /*
  * Number of pcap_dispatch() iterations to do without extra wait after each
  * received EAPOL packet or authentication notification. This is used to reduce
  * latency for EAPOL receive.
  */
 static const size_t no_wait_count = 750;

 struct l2_packet_data {
 	pcap_t *pcap;
 	unsigned int num_fast_poll;
 	char ifname[100];
 	u8 own_addr[ETH_ALEN];
 	void (*rx_callback)(void *ctx, const u8 *src_addr,
 			    const u8 *buf, size_t len);
 	void *rx_callback_ctx;
 	int l2_hdr; /* whether to include layer 2 (Ethernet) header in calls to
 		     * rx_callback and l2_packet_send() */
 	int running;
 	HANDLE rx_avail, rx_done, rx_thread, rx_thread_done, rx_notify;
 	u8 *rx_buf, *rx_src;
 	size_t rx_len;
 	size_t rx_no_wait;
 };


 int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
 {
 	os_memcpy(addr, l2->own_addr, ETH_ALEN);
 	return 0;
 }


 int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
 		   const u8 *buf, size_t len)
 {
 	int ret;
 	struct l2_ethhdr *eth;

 	if (l2 == NULL)
 		return -1;

 	if (l2->l2_hdr) {
 		ret = pcap_sendpacket(l2->pcap, buf, len);
 	} else {
 		size_t mlen = sizeof(*eth) + len;
 		eth = os_malloc(mlen);
 		if (eth == NULL)
 			return -1;

 		os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
 		os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
 		eth->h_proto = htons(proto);
 		os_memcpy(eth + 1, buf, len);
 		ret = pcap_sendpacket(l2->pcap, (u8 *) eth, mlen);
 		os_free(eth);
 	}

 	return ret;
 }


 /* pcap_dispatch() callback for the RX thread */
 static void l2_packet_receive_cb(u_char *user, const struct pcap_pkthdr *hdr,
 				 const u_char *pkt_data)
 {
 	struct l2_packet_data *l2 = (struct l2_packet_data *) user;
 	struct l2_ethhdr *ethhdr;

 	if (pkt_data == NULL || hdr->caplen < sizeof(*ethhdr))
 		return;

 	ethhdr = (struct l2_ethhdr *) pkt_data;
 	if (l2->l2_hdr) {
 		l2->rx_buf = (u8 *) ethhdr;
 		l2->rx_len = hdr->caplen;
 	} else {
 		l2->rx_buf = (u8 *) (ethhdr + 1);
 		l2->rx_len = hdr->caplen - sizeof(*ethhdr);
 	}
 	l2->rx_src = ethhdr->h_source;
 	SetEvent(l2->rx_avail);
 	WaitForSingleObject(l2->rx_done, INFINITE);
 	ResetEvent(l2->rx_done);
 	l2->rx_no_wait = no_wait_count;
 }


 /* main RX loop that is running in a separate thread */
 static DWORD WINAPI l2_packet_receive_thread(LPVOID arg)
 {
 	struct l2_packet_data *l2 = arg;

 	while (l2->running) {
 		pcap_dispatch(l2->pcap, 1, l2_packet_receive_cb,
 			      (u_char *) l2);
 		if (l2->rx_no_wait > 0)
 			l2->rx_no_wait--;
 		if (WaitForSingleObject(l2->rx_notify,
 					l2->rx_no_wait ? 0 : 50) ==
 		    WAIT_OBJECT_0) {
 			l2->rx_no_wait = no_wait_count;
 			ResetEvent(l2->rx_notify);
 		}
 	}
 	SetEvent(l2->rx_thread_done);
 	ExitThread(0);
 	return 0;
 }


 /* main thread RX event handler */
 static void l2_packet_rx_event(void *eloop_data, void *user_data)
 {
 	struct l2_packet_data *l2 = eloop_data;
 	l2->rx_callback(l2->rx_callback_ctx, l2->rx_src, l2->rx_buf,
 			l2->rx_len);
 	ResetEvent(l2->rx_avail);
 	SetEvent(l2->rx_done);
 }


 static int l2_packet_init_libpcap(struct l2_packet_data *l2,
 				  unsigned short protocol)
 {
 	bpf_u_int32 pcap_maskp, pcap_netp;
 	char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
 	struct bpf_program pcap_fp;

 	pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
 	l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 1, pcap_err);
 	if (l2->pcap == NULL) {
 		fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
 		fprintf(stderr, "ifname='%s'\n", l2->ifname);
 		return -1;
 	}
 	os_snprintf(pcap_filter, sizeof(pcap_filter),
 		    "not ether src " MACSTR " and "
 		    "( ether dst " MACSTR " or ether dst " MACSTR " ) and "
 		    "ether proto 0x%x",
 		    MAC2STR(l2->own_addr), /* do not receive own packets */
 		    MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
 		    protocol);
 	if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
 		fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
 		return -1;
 	}

 	if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
 		fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
 		return -1;
 	}

 	pcap_freecode(&pcap_fp);

 	return 0;
 }


 struct l2_packet_data * l2_packet_init(
 	const char *ifname, const u8 *own_addr, unsigned short protocol,
 	void (*rx_callback)(void *ctx, const u8 *src_addr,
 			    const u8 *buf, size_t len),
 	void *rx_callback_ctx, int l2_hdr)
 {
 	struct l2_packet_data *l2;
 	DWORD thread_id;

 	l2 = os_zalloc(sizeof(struct l2_packet_data));
 	if (l2 == NULL)
 		return NULL;
 	if (os_strncmp(ifname, "\\Device\\NPF_", 12) == 0)
 		os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
 	else
 		os_snprintf(l2->ifname, sizeof(l2->ifname), "\\Device\\NPF_%s",
 			    ifname);
 	l2->rx_callback = rx_callback;
 	l2->rx_callback_ctx = rx_callback_ctx;
 	l2->l2_hdr = l2_hdr;

 	if (own_addr)
 		os_memcpy(l2->own_addr, own_addr, ETH_ALEN);

 	if (l2_packet_init_libpcap(l2, protocol)) {
 		os_free(l2);
 		return NULL;
 	}

 	l2->rx_avail = CreateEvent(NULL, TRUE, FALSE, NULL);
 	l2->rx_done = CreateEvent(NULL, TRUE, FALSE, NULL);
 	l2->rx_notify = CreateEvent(NULL, TRUE, FALSE, NULL);
 	if (l2->rx_avail == NULL || l2->rx_done == NULL ||
 	    l2->rx_notify == NULL) {
 		CloseHandle(l2->rx_avail);
 		CloseHandle(l2->rx_done);
 		CloseHandle(l2->rx_notify);
 		pcap_close(l2->pcap);
 		os_free(l2);
 		return NULL;
 	}

 	eloop_register_event(l2->rx_avail, sizeof(l2->rx_avail),
 			     l2_packet_rx_event, l2, NULL);

 	l2->running = 1;
 	l2->rx_thread = CreateThread(NULL, 0, l2_packet_receive_thread, l2, 0,
 				     &thread_id);

 	return l2;
 }


 struct l2_packet_data * l2_packet_init_bridge(
 	const char *br_ifname, const char *ifname, const u8 *own_addr,
 	unsigned short protocol,
 	void (*rx_callback)(void *ctx, const u8 *src_addr,
 			    const u8 *buf, size_t len),
 	void *rx_callback_ctx, int l2_hdr)
 {
 	return l2_packet_init(br_ifname, own_addr, protocol, rx_callback,
 			      rx_callback_ctx, l2_hdr);
 }


 static void l2_packet_deinit_timeout(void *eloop_ctx, void *timeout_ctx)
 {
 	struct l2_packet_data *l2 = eloop_ctx;

 	if (l2->rx_thread_done &&
 	    WaitForSingleObject(l2->rx_thread_done, 2000) != WAIT_OBJECT_0) {
 		wpa_printf(MSG_DEBUG, "l2_packet_winpcap: RX thread did not "
 			   "exit - kill it\n");
 		TerminateThread(l2->rx_thread, 0);
 	}
 	CloseHandle(l2->rx_thread_done);
 	CloseHandle(l2->rx_thread);
 	if (l2->pcap)
 		pcap_close(l2->pcap);
 	eloop_unregister_event(l2->rx_avail, sizeof(l2->rx_avail));
 	CloseHandle(l2->rx_avail);
 	CloseHandle(l2->rx_done);
 	CloseHandle(l2->rx_notify);
 	os_free(l2);
 }


 void l2_packet_deinit(struct l2_packet_data *l2)
 {
 	if (l2 == NULL)
 		return;

 	l2->rx_thread_done = CreateEvent(NULL, TRUE, FALSE, NULL);

 	l2->running = 0;
 	pcap_breakloop(l2->pcap);

 	/*
 	 * RX thread may be waiting in l2_packet_receive_cb() for l2->rx_done
 	 * event and this event is set in l2_packet_rx_event(). However,
 	 * l2_packet_deinit() may end up being called from l2->rx_callback(),
 	 * so we need to return from here and complete deinitialization in
 	 * a registered timeout to avoid having to forcefully kill the RX
 	 * thread.
 	 */
 	eloop_register_timeout(0, 0, l2_packet_deinit_timeout, l2, NULL);
 }


 int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
 {
 	pcap_if_t *devs, *dev;
 	struct pcap_addr *addr;
 	struct sockaddr_in *saddr;
 	int found = 0;
 	char err[PCAP_ERRBUF_SIZE + 1];

 	if (pcap_findalldevs(&devs, err) < 0) {
 		wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
 		return -1;
 	}

 	for (dev = devs; dev && !found; dev = dev->next) {
 		if (os_strcmp(dev->name, l2->ifname) != 0)
 			continue;

 		addr = dev->addresses;
 		while (addr) {
 			saddr = (struct sockaddr_in *) addr->addr;
 			if (saddr && saddr->sin_family == AF_INET) {
 				os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
 					   len);
 				found = 1;
 				break;
 			}
 			addr = addr->next;
 		}
 	}

 	pcap_freealldevs(devs);

 	return found ? 0 : -1;
 }


 void l2_packet_notify_auth_start(struct l2_packet_data *l2)
 {
 	if (l2)
 		SetEvent(l2->rx_notify);
 }
	/*
	* WPA Supplicant - Layer2 packet handling with WinPcap RX thread
	* Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
	*
	* This software may be distributed under the terms of the BSD license.
	* See README for more details.
	*
	* This l2_packet implementation is explicitly for WinPcap and Windows events.
	* l2_packet_pcap.c has support for WinPcap, but it requires polling to receive
	* frames which means relatively long latency for EAPOL RX processing. The
	* implementation here uses a separate thread to allow WinPcap to be receiving
	* all the time to reduce latency for EAPOL receiving from about 100 ms to 3 ms
	* when comparing l2_packet_pcap.c to l2_packet_winpcap.c. Extra sleep of 50 ms
	* is added in to receive thread whenever no EAPOL frames has been received for
	* a while. Whenever an EAPOL handshake is expected, this sleep is removed.
	*
	* The RX thread receives a frame and signals main thread through Windows event
	* about the availability of a new frame. Processing the received frame is
	* synchronized with pair of Windows events so that no extra buffer or queuing
	* mechanism is needed. This implementation requires Windows specific event
	* loop implementation, i.e., eloop_win.c.
	*
	* WinPcap has pcap_getevent() that could, in theory at least, be used to
	* implement this kind of waiting with a simpler single-thread design. However,
	* that event handle is not really signaled immediately when receiving each
	* frame, so it does not really work for this kind of use.
	*/

	#include "includes.h"
	#include <pcap.h>

	#include "common.h"
	#include "eloop.h"
	#include "l2_packet.h"


	static const u8 pae_group_addr[ETH_ALEN] =
	{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };

	/*
	* Number of pcap_dispatch() iterations to do without extra wait after each
	* received EAPOL packet or authentication notification. This is used to reduce
	* latency for EAPOL receive.
	*/
	static const size_t no_wait_count = 750;

	struct l2_packet_data {
	pcap_t *pcap;
	unsigned int num_fast_poll;
	char ifname[100];
	u8 own_addr[ETH_ALEN];
	void (rx_callback)(void ctx, const u8 *src_addr,
	const u8 *buf, size_t len);
	void *rx_callback_ctx;
	int l2_hdr; /* whether to include layer 2 (Ethernet) header in calls to
	* rx_callback and l2_packet_send() */
	int running;
	HANDLE rx_avail, rx_done, rx_thread, rx_thread_done, rx_notify;
	u8 rx_buf, rx_src;
	size_t rx_len;
	size_t rx_no_wait;
	};


	int l2_packet_get_own_addr(struct l2_packet_data l2, u8 addr)
	{
	os_memcpy(addr, l2->own_addr, ETH_ALEN);
	return 0;
	}


	int l2_packet_send(struct l2_packet_data l2, const u8 dst_addr, u16 proto,
	const u8 *buf, size_t len)
	{
	int ret;
	struct l2_ethhdr *eth;

	if (l2 == NULL)
	return -1;

	if (l2->l2_hdr) {
	ret = pcap_sendpacket(l2->pcap, buf, len);
	} else {
	size_t mlen = sizeof(*eth) + len;
	eth = os_malloc(mlen);
	if (eth == NULL)
	return -1;

	os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
	os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
	eth->h_proto = htons(proto);
	os_memcpy(eth + 1, buf, len);
	ret = pcap_sendpacket(l2->pcap, (u8 *) eth, mlen);
	os_free(eth);
	}

	return ret;
	}


	/* pcap_dispatch() callback for the RX thread */
	static void l2_packet_receive_cb(u_char user, const struct pcap_pkthdr hdr,
	const u_char *pkt_data)
	{
	struct l2_packet_data l2 = (struct l2_packet_data ) user;
	struct l2_ethhdr *ethhdr;

	if (pkt_data == NULL \|\| hdr->caplen < sizeof(*ethhdr))
	return;

	ethhdr = (struct l2_ethhdr *) pkt_data;
	if (l2->l2_hdr) {
	l2->rx_buf = (u8 *) ethhdr;
	l2->rx_len = hdr->caplen;
	} else {
	l2->rx_buf = (u8 *) (ethhdr + 1);
	l2->rx_len = hdr->caplen - sizeof(*ethhdr);
	}
	l2->rx_src = ethhdr->h_source;
	SetEvent(l2->rx_avail);
	WaitForSingleObject(l2->rx_done, INFINITE);
	ResetEvent(l2->rx_done);
	l2->rx_no_wait = no_wait_count;
	}


	/* main RX loop that is running in a separate thread */
	static DWORD WINAPI l2_packet_receive_thread(LPVOID arg)
	{
	struct l2_packet_data *l2 = arg;

	while (l2->running) {
	pcap_dispatch(l2->pcap, 1, l2_packet_receive_cb,
	(u_char *) l2);
	if (l2->rx_no_wait > 0)
	l2->rx_no_wait--;
	if (WaitForSingleObject(l2->rx_notify,
	l2->rx_no_wait ? 0 : 50) ==
	WAIT_OBJECT_0) {
	l2->rx_no_wait = no_wait_count;
	ResetEvent(l2->rx_notify);
	}
	}
	SetEvent(l2->rx_thread_done);
	ExitThread(0);
	return 0;
	}


	/* main thread RX event handler */
	static void l2_packet_rx_event(void eloop_data, void user_data)
	{
	struct l2_packet_data *l2 = eloop_data;
	l2->rx_callback(l2->rx_callback_ctx, l2->rx_src, l2->rx_buf,
	l2->rx_len);
	ResetEvent(l2->rx_avail);
	SetEvent(l2->rx_done);
	}


	static int l2_packet_init_libpcap(struct l2_packet_data *l2,
	unsigned short protocol)
	{
	bpf_u_int32 pcap_maskp, pcap_netp;
	char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
	struct bpf_program pcap_fp;

	pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
	l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 1, pcap_err);
	if (l2->pcap == NULL) {
	fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
	fprintf(stderr, "ifname='%s'\n", l2->ifname);
	return -1;
	}
	os_snprintf(pcap_filter, sizeof(pcap_filter),
	"not ether src " MACSTR " and "
	"( ether dst " MACSTR " or ether dst " MACSTR " ) and "
	"ether proto 0x%x",
	MAC2STR(l2->own_addr), /* do not receive own packets */
	MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
	protocol);
	if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
	fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
	return -1;
	}

	if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
	fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
	return -1;
	}

	pcap_freecode(&pcap_fp);

	return 0;
	}


	struct l2_packet_data * l2_packet_init(
	const char ifname, const u8 own_addr, unsigned short protocol,
	void (rx_callback)(void ctx, const u8 *src_addr,
	const u8 *buf, size_t len),
	void *rx_callback_ctx, int l2_hdr)
	{
	struct l2_packet_data *l2;
	DWORD thread_id;

	l2 = os_zalloc(sizeof(struct l2_packet_data));
	if (l2 == NULL)
	return NULL;
	if (os_strncmp(ifname, "\\Device\\NPF_", 12) == 0)
	os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
	else
	os_snprintf(l2->ifname, sizeof(l2->ifname), "\\Device\\NPF_%s",
	ifname);
	l2->rx_callback = rx_callback;
	l2->rx_callback_ctx = rx_callback_ctx;
	l2->l2_hdr = l2_hdr;

	if (own_addr)
	os_memcpy(l2->own_addr, own_addr, ETH_ALEN);

	if (l2_packet_init_libpcap(l2, protocol)) {
	os_free(l2);
	return NULL;
	}

	l2->rx_avail = CreateEvent(NULL, TRUE, FALSE, NULL);
	l2->rx_done = CreateEvent(NULL, TRUE, FALSE, NULL);
	l2->rx_notify = CreateEvent(NULL, TRUE, FALSE, NULL);
	if (l2->rx_avail == NULL \|\| l2->rx_done == NULL \|\|
	l2->rx_notify == NULL) {
	CloseHandle(l2->rx_avail);
	CloseHandle(l2->rx_done);
	CloseHandle(l2->rx_notify);
	pcap_close(l2->pcap);
	os_free(l2);
	return NULL;
	}

	eloop_register_event(l2->rx_avail, sizeof(l2->rx_avail),
	l2_packet_rx_event, l2, NULL);

	l2->running = 1;
	l2->rx_thread = CreateThread(NULL, 0, l2_packet_receive_thread, l2, 0,
	&thread_id);

	return l2;
	}


	struct l2_packet_data * l2_packet_init_bridge(
	const char br_ifname, const char ifname, const u8 *own_addr,
	unsigned short protocol,
	void (rx_callback)(void ctx, const u8 *src_addr,
	const u8 *buf, size_t len),
	void *rx_callback_ctx, int l2_hdr)
	{
	return l2_packet_init(br_ifname, own_addr, protocol, rx_callback,
	rx_callback_ctx, l2_hdr);
	}


	static void l2_packet_deinit_timeout(void eloop_ctx, void timeout_ctx)
	{
	struct l2_packet_data *l2 = eloop_ctx;

	if (l2->rx_thread_done &&
	WaitForSingleObject(l2->rx_thread_done, 2000) != WAIT_OBJECT_0) {
	wpa_printf(MSG_DEBUG, "l2_packet_winpcap: RX thread did not "
	"exit - kill it\n");
	TerminateThread(l2->rx_thread, 0);
	}
	CloseHandle(l2->rx_thread_done);
	CloseHandle(l2->rx_thread);
	if (l2->pcap)
	pcap_close(l2->pcap);
	eloop_unregister_event(l2->rx_avail, sizeof(l2->rx_avail));
	CloseHandle(l2->rx_avail);
	CloseHandle(l2->rx_done);
	CloseHandle(l2->rx_notify);
	os_free(l2);
	}


	void l2_packet_deinit(struct l2_packet_data *l2)
	{
	if (l2 == NULL)
	return;

	l2->rx_thread_done = CreateEvent(NULL, TRUE, FALSE, NULL);

	l2->running = 0;
	pcap_breakloop(l2->pcap);

	/*
	* RX thread may be waiting in l2_packet_receive_cb() for l2->rx_done
	* event and this event is set in l2_packet_rx_event(). However,
	* l2_packet_deinit() may end up being called from l2->rx_callback(),
	* so we need to return from here and complete deinitialization in
	* a registered timeout to avoid having to forcefully kill the RX
	* thread.
	*/
	eloop_register_timeout(0, 0, l2_packet_deinit_timeout, l2, NULL);
	}


	int l2_packet_get_ip_addr(struct l2_packet_data l2, char buf, size_t len)
	{
	pcap_if_t devs, dev;
	struct pcap_addr *addr;
	struct sockaddr_in *saddr;
	int found = 0;
	char err[PCAP_ERRBUF_SIZE + 1];

	if (pcap_findalldevs(&devs, err) < 0) {
	wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
	return -1;
	}

	for (dev = devs; dev && !found; dev = dev->next) {
	if (os_strcmp(dev->name, l2->ifname) != 0)
	continue;

	addr = dev->addresses;
	while (addr) {
	saddr = (struct sockaddr_in *) addr->addr;
	if (saddr && saddr->sin_family == AF_INET) {
	os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
	len);
	found = 1;
	break;
	}
	addr = addr->next;
	}
	}

	pcap_freealldevs(devs);

	return found ? 0 : -1;
	}


	void l2_packet_notify_auth_start(struct l2_packet_data *l2)
	{
	if (l2)
	SetEvent(l2->rx_notify);
	}