[thirdparty/hostap.git] / src / l2_packet / l2_packet_pcap.c

/*
 * WPA Supplicant - Layer2 packet handling with libpcap/libdnet and WinPcap
 * 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.
 */

#include "includes.h"
#ifndef CONFIG_NATIVE_WINDOWS
#include <sys/ioctl.h>
#endif /* CONFIG_NATIVE_WINDOWS */
#include <pcap.h>
#ifndef CONFIG_WINPCAP
#include <dnet.h>
#endif /* CONFIG_WINPCAP */

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


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

struct l2_packet_data {
	pcap_t *pcap;
#ifdef CONFIG_WINPCAP
	unsigned int num_fast_poll;
#else /* CONFIG_WINPCAP */
	eth_t *eth;
#endif /* CONFIG_WINPCAP */
	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 */
};


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


#ifndef CONFIG_WINPCAP
static int l2_packet_init_libdnet(struct l2_packet_data *l2)
{
	eth_addr_t own_addr;

	l2->eth = eth_open(l2->ifname);
	if (!l2->eth) {
		printf("Failed to open interface '%s'.\n", l2->ifname);
		perror("eth_open");
		return -1;
	}

	if (eth_get(l2->eth, &own_addr) < 0) {
		printf("Failed to get own hw address from interface '%s'.\n",
		       l2->ifname);
		perror("eth_get");
		eth_close(l2->eth);
		l2->eth = NULL;
		return -1;
	}
	os_memcpy(l2->own_addr, own_addr.data, ETH_ALEN);

	return 0;
}
#endif /* CONFIG_WINPCAP */


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) {
#ifdef CONFIG_WINPCAP
		ret = pcap_sendpacket(l2->pcap, buf, len);
#else /* CONFIG_WINPCAP */
		ret = eth_send(l2->eth, buf, len);
#endif /* CONFIG_WINPCAP */
	} 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);

#ifdef CONFIG_WINPCAP
		ret = pcap_sendpacket(l2->pcap, (u8 *) eth, mlen);
#else /* CONFIG_WINPCAP */
		ret = eth_send(l2->eth, (u8 *) eth, mlen);
#endif /* CONFIG_WINPCAP */

		os_free(eth);
	}

	return ret;
}


#ifndef CONFIG_WINPCAP
static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
{
	struct l2_packet_data *l2 = eloop_ctx;
	pcap_t *pcap = sock_ctx;
	struct pcap_pkthdr hdr;
	const u_char *packet;
	struct l2_ethhdr *ethhdr;
	unsigned char *buf;
	size_t len;

	packet = pcap_next(pcap, &hdr);

	if (packet == NULL || hdr.caplen < sizeof(*ethhdr))
		return;

	ethhdr = (struct l2_ethhdr *) packet;
	if (l2->l2_hdr) {
		buf = (unsigned char *) ethhdr;
		len = hdr.caplen;
	} else {
		buf = (unsigned char *) (ethhdr + 1);
		len = hdr.caplen - sizeof(*ethhdr);
	}
	l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
}
#endif /* CONFIG_WINPCAP */


#ifdef CONFIG_WINPCAP
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;
	unsigned char *buf;
	size_t len;

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

	ethhdr = (struct l2_ethhdr *) pkt_data;
	if (l2->l2_hdr) {
		buf = (unsigned char *) ethhdr;
		len = hdr->caplen;
	} else {
		buf = (unsigned char *) (ethhdr + 1);
		len = hdr->caplen - sizeof(*ethhdr);
	}
	l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
	/*
	 * Use shorter poll interval for 3 seconds to reduce latency during key
	 * handshake.
	 */
	l2->num_fast_poll = 3 * 50;
}


static void l2_packet_receive_timeout(void *eloop_ctx, void *timeout_ctx)
{
	struct l2_packet_data *l2 = eloop_ctx;
	pcap_t *pcap = timeout_ctx;
	int timeout;

	if (l2->num_fast_poll > 0) {
		timeout = 20000;
		l2->num_fast_poll--;
	} else
		timeout = 100000;

	/* Register new timeout before calling l2_packet_receive() since
	 * receive handler may free this l2_packet instance (which will
	 * cancel this timeout). */
	eloop_register_timeout(0, timeout, l2_packet_receive_timeout,
			       l2, pcap);
	pcap_dispatch(pcap, 10, l2_packet_receive_cb, (u_char *) l2);
}
#endif /* CONFIG_WINPCAP */


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;

#ifdef CONFIG_WINPCAP
	char ifname[128];
	os_snprintf(ifname, sizeof(ifname), "\\Device\\NPF_%s", l2->ifname);
	pcap_lookupnet(ifname, &pcap_netp, &pcap_maskp, pcap_err);
	l2->pcap = pcap_open_live(ifname, 2500, 0, 10, pcap_err);
	if (l2->pcap == NULL) {
		fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
		fprintf(stderr, "ifname='%s'\n", ifname);
		return -1;
	}
	if (pcap_setnonblock(l2->pcap, 1, pcap_err) < 0)
		fprintf(stderr, "pcap_setnonblock: %s\n",
			pcap_geterr(l2->pcap));
#else /* CONFIG_WINPCAP */
	pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
	l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
	if (l2->pcap == NULL) {
		fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
		fprintf(stderr, "ifname='%s'\n", l2->ifname);
		return -1;
	}
	if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
	    pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
		fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
			pcap_geterr(l2->pcap));
		return -1;
	}
#endif /* CONFIG_WINPCAP */
	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);
#ifdef BIOCIMMEDIATE
	/*
	 * When libpcap uses BPF we must enable "immediate mode" to
	 * receive frames right away; otherwise the system may
	 * buffer them for us.
	 */
	{
		unsigned int on = 1;
		if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
			fprintf(stderr, "%s: cannot enable immediate mode on "
				"interface %s: %s\n",
				__func__, l2->ifname, strerror(errno));
			/* XXX should we fail? */
		}
	}
#endif /* BIOCIMMEDIATE */

#ifdef CONFIG_WINPCAP
	eloop_register_timeout(0, 100000, l2_packet_receive_timeout,
			       l2, l2->pcap);
#else /* CONFIG_WINPCAP */
	eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
				 l2_packet_receive, l2, l2->pcap);
#endif /* CONFIG_WINPCAP */

	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;

	l2 = os_zalloc(sizeof(struct l2_packet_data));
	if (l2 == NULL)
		return NULL;
	os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
	l2->rx_callback = rx_callback;
	l2->rx_callback_ctx = rx_callback_ctx;
	l2->l2_hdr = l2_hdr;

#ifdef CONFIG_WINPCAP
	if (own_addr)
		os_memcpy(l2->own_addr, own_addr, ETH_ALEN);
#else /* CONFIG_WINPCAP */
	if (l2_packet_init_libdnet(l2))
		return NULL;
#endif /* CONFIG_WINPCAP */

	if (l2_packet_init_libpcap(l2, protocol)) {
#ifndef CONFIG_WINPCAP
		eth_close(l2->eth);
#endif /* CONFIG_WINPCAP */
		os_free(l2);
		return NULL;
	}

	return l2;
}


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

#ifdef CONFIG_WINPCAP
	eloop_cancel_timeout(l2_packet_receive_timeout, l2, l2->pcap);
#else /* CONFIG_WINPCAP */
	if (l2->eth)
		eth_close(l2->eth);
	eloop_unregister_read_sock(pcap_get_selectable_fd(l2->pcap));
#endif /* CONFIG_WINPCAP */
	if (l2->pcap)
		pcap_close(l2->pcap);
	os_free(l2);
}


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)
{
#ifdef CONFIG_WINPCAP
	/*
	 * Use shorter poll interval for 3 seconds to reduce latency during key
	 * handshake.
	 */
	l2->num_fast_poll = 3 * 50;
	eloop_cancel_timeout(l2_packet_receive_timeout, l2, l2->pcap);
	eloop_register_timeout(0, 10000, l2_packet_receive_timeout,
			       l2, l2->pcap);
#endif /* CONFIG_WINPCAP */
}
Commit	Line	Data
6fc6879b JM	1	/*
	2	* WPA Supplicant - Layer2 packet handling with libpcap/libdnet and WinPcap
	3	* Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
	4	*
0f3d578e JM	5	* This software may be distributed under the terms of the BSD license.
0f3d578e JM	6	* See README for more details.
6fc6879b JM	7	*/
	8
	9	#include "includes.h"
	10	#ifndef CONFIG_NATIVE_WINDOWS
	11	#include <sys/ioctl.h>
	12	#endif /* CONFIG_NATIVE_WINDOWS */
	13	#include <pcap.h>
	14	#ifndef CONFIG_WINPCAP
	15	#include <dnet.h>
	16	#endif /* CONFIG_WINPCAP */
	17
	18	#include "common.h"
	19	#include "eloop.h"
	20	#include "l2_packet.h"
	21
	22
	23	static const u8 pae_group_addr[ETH_ALEN] =
	24	{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 };
	25
	26	struct l2_packet_data {
	27	pcap_t *pcap;
	28	#ifdef CONFIG_WINPCAP
	29	unsigned int num_fast_poll;
	30	#else /* CONFIG_WINPCAP */
	31	eth_t *eth;
	32	#endif /* CONFIG_WINPCAP */
	33	char ifname[100];
	34	u8 own_addr[ETH_ALEN];
	35	void (rx_callback)(void ctx, const u8 *src_addr,
	36	const u8 *buf, size_t len);
	37	void *rx_callback_ctx;
	38	int l2_hdr; /* whether to include layer 2 (Ethernet) header in calls
	39	* to rx_callback */
	40	};
	41
	42
	43	int l2_packet_get_own_addr(struct l2_packet_data l2, u8 addr)
	44	{
	45	os_memcpy(addr, l2->own_addr, ETH_ALEN);
	46	return 0;
	47	}
	48
	49
	50	#ifndef CONFIG_WINPCAP
	51	static int l2_packet_init_libdnet(struct l2_packet_data *l2)
	52	{
	53	eth_addr_t own_addr;
	54
	55	l2->eth = eth_open(l2->ifname);
	56	if (!l2->eth) {
	57	printf("Failed to open interface '%s'.\n", l2->ifname);
	58	perror("eth_open");
	59	return -1;
	60	}
	61
	62	if (eth_get(l2->eth, &own_addr) < 0) {
	63	printf("Failed to get own hw address from interface '%s'.\n",
	64	l2->ifname);
	65	perror("eth_get");
	66	eth_close(l2->eth);
	67	l2->eth = NULL;
	68	return -1;
	69	}
	70	os_memcpy(l2->own_addr, own_addr.data, ETH_ALEN);
71
72	return 0;
73	}
74	#endif /* CONFIG_WINPCAP */
75
76
77	int l2_packet_send(struct l2_packet_data l2, const u8 dst_addr, u16 proto,
78	const u8 *buf, size_t len)
79	{
80	int ret;
81	struct l2_ethhdr *eth;
82
83	if (l2 == NULL)
84	return -1;
85
86	if (l2->l2_hdr) {
87	#ifdef CONFIG_WINPCAP
88	ret = pcap_sendpacket(l2->pcap, buf, len);
89	#else /* CONFIG_WINPCAP */
90	ret = eth_send(l2->eth, buf, len);
91	#endif /* CONFIG_WINPCAP */
92	} else {
93	size_t mlen = sizeof(*eth) + len;
94	eth = os_malloc(mlen);
95	if (eth == NULL)
96	return -1;
97
98	os_memcpy(eth->h_dest, dst_addr, ETH_ALEN);
99	os_memcpy(eth->h_source, l2->own_addr, ETH_ALEN);
100	eth->h_proto = htons(proto);
101	os_memcpy(eth + 1, buf, len);
102
103	#ifdef CONFIG_WINPCAP
104	ret = pcap_sendpacket(l2->pcap, (u8 *) eth, mlen);
105	#else /* CONFIG_WINPCAP */
106	ret = eth_send(l2->eth, (u8 *) eth, mlen);
107	#endif /* CONFIG_WINPCAP */
108
109	os_free(eth);
110	}
111
112	return ret;
113	}
114
115
116	#ifndef CONFIG_WINPCAP
117	static void l2_packet_receive(int sock, void eloop_ctx, void sock_ctx)
118	{
119	struct l2_packet_data *l2 = eloop_ctx;
120	pcap_t *pcap = sock_ctx;
121	struct pcap_pkthdr hdr;
122	const u_char *packet;
123	struct l2_ethhdr *ethhdr;
124	unsigned char *buf;
125	size_t len;
126
127	packet = pcap_next(pcap, &hdr);
128
129	if (packet == NULL \|\| hdr.caplen < sizeof(*ethhdr))
130	return;
131
132	ethhdr = (struct l2_ethhdr *) packet;
133	if (l2->l2_hdr) {
134	buf = (unsigned char *) ethhdr;
135	len = hdr.caplen;
136	} else {
137	buf = (unsigned char *) (ethhdr + 1);
138	len = hdr.caplen - sizeof(*ethhdr);
139	}
140	l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
141	}
142	#endif /* CONFIG_WINPCAP */
143
144
145	#ifdef CONFIG_WINPCAP
146	static void l2_packet_receive_cb(u_char user, const struct pcap_pkthdr hdr,
147	const u_char *pkt_data)
148	{
149	struct l2_packet_data l2 = (struct l2_packet_data ) user;
150	struct l2_ethhdr *ethhdr;
151	unsigned char *buf;
152	size_t len;
153
154	if (pkt_data == NULL \|\| hdr->caplen < sizeof(*ethhdr))
155	return;
156
157	ethhdr = (struct l2_ethhdr *) pkt_data;
158	if (l2->l2_hdr) {
159	buf = (unsigned char *) ethhdr;
160	len = hdr->caplen;
161	} else {
162	buf = (unsigned char *) (ethhdr + 1);
163	len = hdr->caplen - sizeof(*ethhdr);
164	}
165	l2->rx_callback(l2->rx_callback_ctx, ethhdr->h_source, buf, len);
166	/*
167	* Use shorter poll interval for 3 seconds to reduce latency during key
168	* handshake.
169	*/
170	l2->num_fast_poll = 3 * 50;
171	}
172
173
174	static void l2_packet_receive_timeout(void eloop_ctx, void timeout_ctx)
175	{
176	struct l2_packet_data *l2 = eloop_ctx;
177	pcap_t *pcap = timeout_ctx;
178	int timeout;
179
180	if (l2->num_fast_poll > 0) {
181	timeout = 20000;
182	l2->num_fast_poll--;
183	} else
184	timeout = 100000;
185
186	/* Register new timeout before calling l2_packet_receive() since
187	* receive handler may free this l2_packet instance (which will
188	* cancel this timeout). */
189	eloop_register_timeout(0, timeout, l2_packet_receive_timeout,
190	l2, pcap);
191	pcap_dispatch(pcap, 10, l2_packet_receive_cb, (u_char *) l2);
192	}
193	#endif /* CONFIG_WINPCAP */
194
195
196	static int l2_packet_init_libpcap(struct l2_packet_data *l2,
197	unsigned short protocol)
198	{
199	bpf_u_int32 pcap_maskp, pcap_netp;
200	char pcap_filter[200], pcap_err[PCAP_ERRBUF_SIZE];
201	struct bpf_program pcap_fp;
202
203	#ifdef CONFIG_WINPCAP
204	char ifname[128];
205	os_snprintf(ifname, sizeof(ifname), "\\Device\\NPF_%s", l2->ifname);
206	pcap_lookupnet(ifname, &pcap_netp, &pcap_maskp, pcap_err);
207	l2->pcap = pcap_open_live(ifname, 2500, 0, 10, pcap_err);
208	if (l2->pcap == NULL) {
209	fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
210	fprintf(stderr, "ifname='%s'\n", ifname);
211	return -1;
212	}
213	if (pcap_setnonblock(l2->pcap, 1, pcap_err) < 0)
214	fprintf(stderr, "pcap_setnonblock: %s\n",
215	pcap_geterr(l2->pcap));
216	#else /* CONFIG_WINPCAP */
217	pcap_lookupnet(l2->ifname, &pcap_netp, &pcap_maskp, pcap_err);
218	l2->pcap = pcap_open_live(l2->ifname, 2500, 0, 10, pcap_err);
219	if (l2->pcap == NULL) {
220	fprintf(stderr, "pcap_open_live: %s\n", pcap_err);
221	fprintf(stderr, "ifname='%s'\n", l2->ifname);
222	return -1;
223	}
224	if (pcap_datalink(l2->pcap) != DLT_EN10MB &&
225	pcap_set_datalink(l2->pcap, DLT_EN10MB) < 0) {
226	fprintf(stderr, "pcap_set_datalink(DLT_EN10MB): %s\n",
227	pcap_geterr(l2->pcap));
228	return -1;
229	}
230	#endif /* CONFIG_WINPCAP */
231	os_snprintf(pcap_filter, sizeof(pcap_filter),
232	"not ether src " MACSTR " and "
233	"( ether dst " MACSTR " or ether dst " MACSTR " ) and "
234	"ether proto 0x%x",
235	MAC2STR(l2->own_addr), /* do not receive own packets */
236	MAC2STR(l2->own_addr), MAC2STR(pae_group_addr),
237	protocol);
238	if (pcap_compile(l2->pcap, &pcap_fp, pcap_filter, 1, pcap_netp) < 0) {
239	fprintf(stderr, "pcap_compile: %s\n", pcap_geterr(l2->pcap));
240	return -1;
241	}
242
243	if (pcap_setfilter(l2->pcap, &pcap_fp) < 0) {
244	fprintf(stderr, "pcap_setfilter: %s\n", pcap_geterr(l2->pcap));
245	return -1;
246	}
247
248	pcap_freecode(&pcap_fp);
249	#ifdef BIOCIMMEDIATE
250	/*
251	* When libpcap uses BPF we must enable "immediate mode" to
252	* receive frames right away; otherwise the system may
253	* buffer them for us.
254	*/
255	{
256	unsigned int on = 1;
257	if (ioctl(pcap_fileno(l2->pcap), BIOCIMMEDIATE, &on) < 0) {
258	fprintf(stderr, "%s: cannot enable immediate mode on "
259	"interface %s: %s\n",
260	__func__, l2->ifname, strerror(errno));
261	/* XXX should we fail? */
262	}
263	}
264	#endif /* BIOCIMMEDIATE */
265
266	#ifdef CONFIG_WINPCAP
267	eloop_register_timeout(0, 100000, l2_packet_receive_timeout,
268	l2, l2->pcap);
269	#else /* CONFIG_WINPCAP */
270	eloop_register_read_sock(pcap_get_selectable_fd(l2->pcap),
271	l2_packet_receive, l2, l2->pcap);
272	#endif /* CONFIG_WINPCAP */
273
274	return 0;
275	}
276
277
278	struct l2_packet_data * l2_packet_init(
279	const char ifname, const u8 own_addr, unsigned short protocol,
280	void (rx_callback)(void ctx, const u8 *src_addr,
281	const u8 *buf, size_t len),
282	void *rx_callback_ctx, int l2_hdr)
283	{
284	struct l2_packet_data *l2;
285
286	l2 = os_zalloc(sizeof(struct l2_packet_data));
287	if (l2 == NULL)
288	return NULL;
289	os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname));
290	l2->rx_callback = rx_callback;
291	l2->rx_callback_ctx = rx_callback_ctx;
292	l2->l2_hdr = l2_hdr;
293
294	#ifdef CONFIG_WINPCAP
295	if (own_addr)
296	os_memcpy(l2->own_addr, own_addr, ETH_ALEN);
297	#else /* CONFIG_WINPCAP */
298	if (l2_packet_init_libdnet(l2))
299	return NULL;
300	#endif /* CONFIG_WINPCAP */
301
302	if (l2_packet_init_libpcap(l2, protocol)) {
303	#ifndef CONFIG_WINPCAP
304	eth_close(l2->eth);
305	#endif /* CONFIG_WINPCAP */
306	os_free(l2);
307	return NULL;
308	}
309
310	return l2;
311	}
312
313
314	void l2_packet_deinit(struct l2_packet_data *l2)
315	{
316	if (l2 == NULL)
317	return;
318
319	#ifdef CONFIG_WINPCAP
320	eloop_cancel_timeout(l2_packet_receive_timeout, l2, l2->pcap);
321	#else /* CONFIG_WINPCAP */
322	if (l2->eth)
323	eth_close(l2->eth);
324	eloop_unregister_read_sock(pcap_get_selectable_fd(l2->pcap));
325	#endif /* CONFIG_WINPCAP */
326	if (l2->pcap)
327	pcap_close(l2->pcap);
328	os_free(l2);
329	}
330
331
332	int l2_packet_get_ip_addr(struct l2_packet_data l2, char buf, size_t len)
333	{
334	pcap_if_t devs, dev;
335	struct pcap_addr *addr;
336	struct sockaddr_in *saddr;
337	int found = 0;
338	char err[PCAP_ERRBUF_SIZE + 1];
339
340	if (pcap_findalldevs(&devs, err) < 0) {
341	wpa_printf(MSG_DEBUG, "pcap_findalldevs: %s\n", err);
342	return -1;
343	}
344
345	for (dev = devs; dev && !found; dev = dev->next) {
346	if (os_strcmp(dev->name, l2->ifname) != 0)
347	continue;
348
349	addr = dev->addresses;
350	while (addr) {
351	saddr = (struct sockaddr_in *) addr->addr;
352	if (saddr && saddr->sin_family == AF_INET) {
353	os_strlcpy(buf, inet_ntoa(saddr->sin_addr),
354	len);
355	found = 1;
356	break;
357	}
358	addr = addr->next;
359	}
360	}
361
362	pcap_freealldevs(devs);
363
364	return found ? 0 : -1;
365	}
366
367
368	void l2_packet_notify_auth_start(struct l2_packet_data *l2)
369	{
370	#ifdef CONFIG_WINPCAP
371	/*
372	* Use shorter poll interval for 3 seconds to reduce latency during key
373	* handshake.
374	*/
375	l2->num_fast_poll = 3 * 50;
376	eloop_cancel_timeout(l2_packet_receive_timeout, l2, l2->pcap);
377	eloop_register_timeout(0, 10000, l2_packet_receive_timeout,
378	l2, l2->pcap);
379	#endif /* CONFIG_WINPCAP */
380	}