[thirdparty/hostap.git] / wlantest / process.c

/*
 * Received frame processing
 * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "utils/radiotap.h"
#include "utils/radiotap_iter.h"
#include "common/ieee802_11_defs.h"
#include "wlantest.h"


static struct wlantest_sta * rx_get_sta(struct wlantest *wt,
					const struct ieee80211_hdr *hdr,
					size_t len, int *to_ap)
{
	u16 fc;
	const u8 *sta_addr, *bssid;
	struct wlantest_bss *bss;

	*to_ap = 0;
	if (hdr->addr1[0] & 0x01)
		return NULL; /* Ignore group addressed frames */

	fc = le_to_host16(hdr->frame_control);
	switch (WLAN_FC_GET_TYPE(fc)) {
	case WLAN_FC_TYPE_MGMT:
		if (len < 24)
			return NULL;
		bssid = hdr->addr3;
		if (os_memcmp(bssid, hdr->addr2, ETH_ALEN) == 0) {
			sta_addr = hdr->addr1;
			*to_ap = 0;
		} else {
			if (os_memcmp(bssid, hdr->addr1, ETH_ALEN) != 0)
				return NULL; /* Unsupported STA-to-STA frame */
			sta_addr = hdr->addr2;
			*to_ap = 1;
		}
		break;
	case WLAN_FC_TYPE_DATA:
		if (len < 24)
			return NULL;
		switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
		case 0:
			return NULL; /* IBSS not supported */
		case WLAN_FC_FROMDS:
			sta_addr = hdr->addr1;
			bssid = hdr->addr2;
			*to_ap = 0;
			break;
		case WLAN_FC_TODS:
			sta_addr = hdr->addr2;
			bssid = hdr->addr1;
			*to_ap = 1;
			break;
		case WLAN_FC_TODS | WLAN_FC_FROMDS:
			return NULL; /* WDS not supported */
		default:
			return NULL;
		}
		break;
	case WLAN_FC_TYPE_CTRL:
		if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PSPOLL &&
		    len >= 16) {
			sta_addr = hdr->addr2;
			bssid = hdr->addr1;
			*to_ap = 1;
		} else
			return NULL;
		break;
	default:
		return NULL;
	}

	bss = bss_find(wt, bssid);
	if (bss == NULL)
		return NULL;
	return sta_find(bss, sta_addr);
}


static void rx_update_ps(struct wlantest *wt, const struct ieee80211_hdr *hdr,
			 size_t len, struct wlantest_sta *sta, int to_ap)
{
	u16 fc, type, stype;

	if (sta == NULL)
		return;

	fc = le_to_host16(hdr->frame_control);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);

	if (!to_ap) {
		if (sta->pwrmgt && !sta->pspoll) {
			u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
			add_note(wt, MSG_DEBUG, "AP " MACSTR " sent a frame "
				 "(%u:%u) to a sleeping STA " MACSTR
				 " (seq=%u)",
				 MAC2STR(sta->bss->bssid),
				 type, stype, MAC2STR(sta->addr),
				 WLAN_GET_SEQ_SEQ(seq_ctrl));
		} else
			sta->pspoll = 0;
		return;
	}

	sta->pspoll = 0;

	if (type == WLAN_FC_TYPE_DATA || type == WLAN_FC_TYPE_MGMT ||
	    (type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL)) {
		/*
		 * In theory, the PS state changes only at the end of the frame
		 * exchange that is ACKed by the AP. However, most cases are
		 * handled with this simpler implementation that does not
		 * maintain state through the frame exchange.
		 */
		if (sta->pwrmgt && !(fc & WLAN_FC_PWRMGT)) {
			add_note(wt, MSG_DEBUG, "STA " MACSTR " woke up from "
				 "sleep", MAC2STR(sta->addr));
			sta->pwrmgt = 0;
		} else if (!sta->pwrmgt && (fc & WLAN_FC_PWRMGT)) {
			add_note(wt, MSG_DEBUG, "STA " MACSTR " went to sleep",
				 MAC2STR(sta->addr));
			sta->pwrmgt = 1;
		}
	}

	if (type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL)
		sta->pspoll = 1;
}


static int rx_duplicate(struct wlantest *wt, const struct ieee80211_hdr *hdr,
			size_t len, struct wlantest_sta *sta, int to_ap)
{
	u16 fc;
	int tid = 16;
	le16 *seq_ctrl;

	if (sta == NULL)
		return 0;

	fc = le_to_host16(hdr->frame_control);
	if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
	    (WLAN_FC_GET_STYPE(fc) & 0x08) && len >= 26) {
		const u8 *qos = ((const u8 *) hdr) + 24;
		tid = qos[0] & 0x0f;
	}

	if (to_ap)
		seq_ctrl = &sta->seq_ctrl_to_ap[tid];
	else
		seq_ctrl = &sta->seq_ctrl_to_sta[tid];

	if ((fc & WLAN_FC_RETRY) && hdr->seq_ctrl == *seq_ctrl) {
		u16 s = le_to_host16(hdr->seq_ctrl);
		add_note(wt, MSG_MSGDUMP, "Ignore duplicated frame (seq=%u "
			 "frag=%u A1=" MACSTR " A2=" MACSTR ")",
			 WLAN_GET_SEQ_SEQ(s), WLAN_GET_SEQ_FRAG(s),
			 MAC2STR(hdr->addr1), MAC2STR(hdr->addr2));
		return 1;
	}

	*seq_ctrl = hdr->seq_ctrl;

	return 0;
}


static void rx_ack(struct wlantest *wt, const struct ieee80211_hdr *hdr)
{
	struct ieee80211_hdr *last = (struct ieee80211_hdr *) wt->last_hdr;
	u16 fc;

	if (wt->last_len < 24 || (last->addr1[0] & 0x01) ||
	    os_memcmp(hdr->addr1, last->addr2, ETH_ALEN) != 0) {
		add_note(wt, MSG_MSGDUMP, "Unknown Ack frame (previous frame "
			 "not seen)");
		return;
	}

	/* Ack to the previous frame */
	fc = le_to_host16(last->frame_control);
	if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
		rx_mgmt_ack(wt, last);
}


static void rx_frame(struct wlantest *wt, const u8 *data, size_t len)
{
	const struct ieee80211_hdr *hdr;
	u16 fc;
	struct wlantest_sta *sta;
	int to_ap;

	wpa_hexdump(MSG_EXCESSIVE, "RX frame", data, len);
	if (len < 2)
		return;

	hdr = (const struct ieee80211_hdr *) data;
	fc = le_to_host16(hdr->frame_control);
	if (fc & WLAN_FC_PVER) {
		wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected pver=%d",
			   fc & WLAN_FC_PVER);
		return;
	}

	sta = rx_get_sta(wt, hdr, len, &to_ap);

	switch (WLAN_FC_GET_TYPE(fc)) {
	case WLAN_FC_TYPE_MGMT:
		if (len < 24)
			break;
		if (rx_duplicate(wt, hdr, len, sta, to_ap))
			break;
		rx_update_ps(wt, hdr, len, sta, to_ap);
		rx_mgmt(wt, data, len);
		break;
	case WLAN_FC_TYPE_CTRL:
		if (len < 10)
			break;
		wt->rx_ctrl++;
		rx_update_ps(wt, hdr, len, sta, to_ap);
		if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_ACK)
			rx_ack(wt, hdr);
		break;
	case WLAN_FC_TYPE_DATA:
		if (len < 24)
			break;
		if (rx_duplicate(wt, hdr, len, sta, to_ap))
			break;
		rx_update_ps(wt, hdr, len, sta, to_ap);
		rx_data(wt, data, len);
		break;
	default:
		wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected type %d",
			   WLAN_FC_GET_TYPE(fc));
		break;
	}

	os_memcpy(wt->last_hdr, data, len > sizeof(wt->last_hdr) ?
		  sizeof(wt->last_hdr) : len);
	wt->last_len = len;
}


static void tx_status(struct wlantest *wt, const u8 *data, size_t len, int ack)
{
	wpa_printf(MSG_DEBUG, "TX status: ack=%d", ack);
	wpa_hexdump(MSG_EXCESSIVE, "TX status frame", data, len);
}


static int check_fcs(const u8 *frame, size_t frame_len, const u8 *fcs)
{
	if (WPA_GET_LE32(fcs) != crc32(frame, frame_len))
		return -1;
	return 0;
}


void wlantest_process(struct wlantest *wt, const u8 *data, size_t len)
{
	struct ieee80211_radiotap_iterator iter;
	int ret;
	int rxflags = 0, txflags = 0, failed = 0, fcs = 0;
	const u8 *frame, *fcspos;
	size_t frame_len;

	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);

	if (ieee80211_radiotap_iterator_init(&iter, (void *) data, len)) {
		add_note(wt, MSG_INFO, "Invalid radiotap frame");
		return;
	}

	for (;;) {
		ret = ieee80211_radiotap_iterator_next(&iter);
		wpa_printf(MSG_EXCESSIVE, "radiotap iter: %d "
			   "this_arg_index=%d", ret, iter.this_arg_index);
		if (ret == -ENOENT)
			break;
		if (ret) {
			add_note(wt, MSG_INFO, "Invalid radiotap header: %d",
				 ret);
			return;
		}
		switch (iter.this_arg_index) {
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iter.this_arg & IEEE80211_RADIOTAP_F_FCS)
				fcs = 1;
			break;
		case IEEE80211_RADIOTAP_RX_FLAGS:
			rxflags = 1;
			break;
		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = 1;
			failed = le_to_host16((*(u16 *) iter.this_arg)) &
				IEEE80211_RADIOTAP_F_TX_FAIL;
			break;

		}
	}

	if (iter.max_length == 8) {
		add_note(wt, MSG_DEBUG, "Skip frame inserted by wlantest");
		return;
	}
	frame = data + iter.max_length;
	frame_len = len - iter.max_length;

	if (fcs && frame_len >= 4) {
		frame_len -= 4;
		fcspos = frame + frame_len;
		if (check_fcs(frame, frame_len, fcspos) < 0) {
			add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
				 "invalid FCS");
			wt->fcs_error++;
			return;
		}
	}

	if (rxflags && txflags)
		return;
	if (!txflags)
		rx_frame(wt, frame, frame_len);
	else {
		add_note(wt, MSG_EXCESSIVE, "TX status - process as RX of "
			 "local frame");
		tx_status(wt, frame, frame_len, !failed);
		/* Process as RX frame to support local monitor interface */
		rx_frame(wt, frame, frame_len);
	}
}


void wlantest_process_prism(struct wlantest *wt, const u8 *data, size_t len)
{
	int fcs = 0;
	const u8 *frame, *fcspos;
	size_t frame_len;
	u32 hdrlen;

	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);

	if (len < 8)
		return;
	hdrlen = WPA_GET_LE32(data + 4);

	if (len < hdrlen) {
		wpa_printf(MSG_INFO, "Too short frame to include prism "
			   "header");
		return;
	}

	frame = data + hdrlen;
	frame_len = len - hdrlen;
	fcs = 1;

	if (fcs && frame_len >= 4) {
		frame_len -= 4;
		fcspos = frame + frame_len;
		if (check_fcs(frame, frame_len, fcspos) < 0) {
			add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
				 "invalid FCS");
			wt->fcs_error++;
			return;
		}
	}

	rx_frame(wt, frame, frame_len);
}


void wlantest_process_80211(struct wlantest *wt, const u8 *data, size_t len)
{
	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);

	if (wt->assume_fcs && len >= 4) {
		const u8 *fcspos;

		len -= 4;
		fcspos = data + len;
		if (check_fcs(data, len, fcspos) < 0) {
			add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
				 "invalid FCS");
			wt->fcs_error++;
			return;
		}
	}

	rx_frame(wt, data, len);
}
Commit	Line	Data
a149fcc7 JM	1	/*
	2	* Received frame processing
	3	* Copyright (c) 2010, 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.
a149fcc7 JM	7	*/
	8
	9	#include "utils/includes.h"
	10
	11	#include "utils/common.h"
	12	#include "utils/radiotap.h"
	13	#include "utils/radiotap_iter.h"
	14	#include "common/ieee802_11_defs.h"
	15	#include "wlantest.h"
	16
	17
7e7a57ae JM	18	static struct wlantest_sta * rx_get_sta(struct wlantest *wt,
	19	const struct ieee80211_hdr *hdr,
	20	size_t len, int *to_ap)
a912dd16 JM	21	{
a912dd16 JM	22	u16 fc;
a912dd16 JM	23	const u8 sta_addr, bssid;
a912dd16 JM	24	struct wlantest_bss *bss;
a912dd16	25
7e7a57ae	26	*to_ap = 0;
a912dd16	27	if (hdr->addr1[0] & 0x01)
7e7a57ae	28	return NULL; /* Ignore group addressed frames */
a912dd16 JM	29
a912dd16 JM	30	fc = le_to_host16(hdr->frame_control);
7e7a57ae JM	31	switch (WLAN_FC_GET_TYPE(fc)) {
	32	case WLAN_FC_TYPE_MGMT:
	33	if (len < 24)
	34	return NULL;
a912dd16 JM	35	bssid = hdr->addr3;
	36	if (os_memcmp(bssid, hdr->addr2, ETH_ALEN) == 0) {
	37	sta_addr = hdr->addr1;
7e7a57ae	38	*to_ap = 0;
a912dd16 JM	39	} else {
a912dd16 JM	40	if (os_memcmp(bssid, hdr->addr1, ETH_ALEN) != 0)
7e7a57ae	41	return NULL; /* Unsupported STA-to-STA frame */
a912dd16	42	sta_addr = hdr->addr2;
7e7a57ae	43	*to_ap = 1;
a912dd16	44	}
7e7a57ae JM	45	break;
	46	case WLAN_FC_TYPE_DATA:
	47	if (len < 24)
	48	return NULL;
a912dd16 JM	49	switch (fc & (WLAN_FC_TODS \| WLAN_FC_FROMDS)) {
a912dd16 JM	50	case 0:
7e7a57ae	51	return NULL; /* IBSS not supported */
a912dd16 JM	52	case WLAN_FC_FROMDS:
	53	sta_addr = hdr->addr1;
	54	bssid = hdr->addr2;
7e7a57ae	55	*to_ap = 0;
a912dd16 JM	56	break;
	57	case WLAN_FC_TODS:
	58	sta_addr = hdr->addr2;
	59	bssid = hdr->addr1;
7e7a57ae	60	*to_ap = 1;
a912dd16 JM	61	break;
a912dd16 JM	62	case WLAN_FC_TODS \| WLAN_FC_FROMDS:
7e7a57ae	63	return NULL; /* WDS not supported */
a912dd16	64	default:
7e7a57ae	65	return NULL;
a912dd16	66	}
7e7a57ae JM	67	break;
	68	case WLAN_FC_TYPE_CTRL:
	69	if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_PSPOLL &&
	70	len >= 16) {
	71	sta_addr = hdr->addr2;
	72	bssid = hdr->addr1;
	73	*to_ap = 1;
	74	} else
	75	return NULL;
	76	break;
dfaeda04 JM	77	default:
dfaeda04 JM	78	return NULL;
a912dd16 JM	79	}
	80
	81	bss = bss_find(wt, bssid);
	82	if (bss == NULL)
dfaeda04	83	return NULL;
7e7a57ae JM	84	return sta_find(bss, sta_addr);
	85	}
	86
	87
	88	static void rx_update_ps(struct wlantest wt, const struct ieee80211_hdr hdr,
	89	size_t len, struct wlantest_sta *sta, int to_ap)
	90	{
	91	u16 fc, type, stype;
	92
	93	if (sta == NULL)
	94	return;
	95
	96	fc = le_to_host16(hdr->frame_control);
	97	type = WLAN_FC_GET_TYPE(fc);
	98	stype = WLAN_FC_GET_STYPE(fc);
	99
	100	if (!to_ap) {
	101	if (sta->pwrmgt && !sta->pspoll) {
	102	u16 seq_ctrl = le_to_host16(hdr->seq_ctrl);
e4d99217 JM	103	add_note(wt, MSG_DEBUG, "AP " MACSTR " sent a frame "
	104	"(%u:%u) to a sleeping STA " MACSTR
	105	" (seq=%u)",
	106	MAC2STR(sta->bss->bssid),
	107	type, stype, MAC2STR(sta->addr),
	108	WLAN_GET_SEQ_SEQ(seq_ctrl));
7e7a57ae JM	109	} else
	110	sta->pspoll = 0;
	111	return;
	112	}
	113
	114	sta->pspoll = 0;
	115
	116	if (type == WLAN_FC_TYPE_DATA \|\| type == WLAN_FC_TYPE_MGMT \|\|
	117	(type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL)) {
	118	/*
	119	* In theory, the PS state changes only at the end of the frame
	120	* exchange that is ACKed by the AP. However, most cases are
	121	* handled with this simpler implementation that does not
	122	* maintain state through the frame exchange.
	123	*/
	124	if (sta->pwrmgt && !(fc & WLAN_FC_PWRMGT)) {
e4d99217 JM	125	add_note(wt, MSG_DEBUG, "STA " MACSTR " woke up from "
e4d99217 JM	126	"sleep", MAC2STR(sta->addr));
7e7a57ae JM	127	sta->pwrmgt = 0;
7e7a57ae JM	128	} else if (!sta->pwrmgt && (fc & WLAN_FC_PWRMGT)) {
e4d99217 JM	129	add_note(wt, MSG_DEBUG, "STA " MACSTR " went to sleep",
e4d99217 JM	130	MAC2STR(sta->addr));
7e7a57ae JM	131	sta->pwrmgt = 1;
	132	}
	133	}
	134
	135	if (type == WLAN_FC_TYPE_CTRL && stype == WLAN_FC_STYPE_PSPOLL)
	136	sta->pspoll = 1;
	137	}
	138
	139
	140	static int rx_duplicate(struct wlantest wt, const struct ieee80211_hdr hdr,
	141	size_t len, struct wlantest_sta *sta, int to_ap)
	142	{
	143	u16 fc;
	144	int tid = 16;
	145	le16 *seq_ctrl;
	146
a912dd16 JM	147	if (sta == NULL)
	148	return 0;
	149
7e7a57ae JM	150	fc = le_to_host16(hdr->frame_control);
	151	if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
	152	(WLAN_FC_GET_STYPE(fc) & 0x08) && len >= 26) {
	153	const u8 qos = ((const u8 ) hdr) + 24;
	154	tid = qos[0] & 0x0f;
	155	}
	156
a912dd16 JM	157	if (to_ap)
	158	seq_ctrl = &sta->seq_ctrl_to_ap[tid];
	159	else
	160	seq_ctrl = &sta->seq_ctrl_to_sta[tid];
	161
	162	if ((fc & WLAN_FC_RETRY) && hdr->seq_ctrl == *seq_ctrl) {
	163	u16 s = le_to_host16(hdr->seq_ctrl);
e4d99217 JM	164	add_note(wt, MSG_MSGDUMP, "Ignore duplicated frame (seq=%u "
	165	"frag=%u A1=" MACSTR " A2=" MACSTR ")",
	166	WLAN_GET_SEQ_SEQ(s), WLAN_GET_SEQ_FRAG(s),
	167	MAC2STR(hdr->addr1), MAC2STR(hdr->addr2));
a912dd16 JM	168	return 1;
	169	}
	170
	171	*seq_ctrl = hdr->seq_ctrl;
	172
	173	return 0;
	174	}
	175
	176
fb8f5fc6 JM	177	static void rx_ack(struct wlantest wt, const struct ieee80211_hdr hdr)
	178	{
	179	struct ieee80211_hdr last = (struct ieee80211_hdr ) wt->last_hdr;
	180	u16 fc;
	181
	182	if (wt->last_len < 24 \|\| (last->addr1[0] & 0x01) \|\|
	183	os_memcmp(hdr->addr1, last->addr2, ETH_ALEN) != 0) {
e4d99217 JM	184	add_note(wt, MSG_MSGDUMP, "Unknown Ack frame (previous frame "
e4d99217 JM	185	"not seen)");
fb8f5fc6 JM	186	return;
	187	}
	188
	189	/* Ack to the previous frame */
	190	fc = le_to_host16(last->frame_control);
	191	if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT)
	192	rx_mgmt_ack(wt, last);
	193	}
	194
	195
a149fcc7 JM	196	static void rx_frame(struct wlantest wt, const u8 data, size_t len)
	197	{
	198	const struct ieee80211_hdr *hdr;
	199	u16 fc;
7e7a57ae JM	200	struct wlantest_sta *sta;
7e7a57ae JM	201	int to_ap;
a149fcc7 JM	202
	203	wpa_hexdump(MSG_EXCESSIVE, "RX frame", data, len);
	204	if (len < 2)
	205	return;
	206
	207	hdr = (const struct ieee80211_hdr *) data;
	208	fc = le_to_host16(hdr->frame_control);
	209	if (fc & WLAN_FC_PVER) {
	210	wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected pver=%d",
	211	fc & WLAN_FC_PVER);
	212	return;
	213	}
	214
7e7a57ae JM	215	sta = rx_get_sta(wt, hdr, len, &to_ap);
7e7a57ae JM	216
a149fcc7 JM	217	switch (WLAN_FC_GET_TYPE(fc)) {
a149fcc7 JM	218	case WLAN_FC_TYPE_MGMT:
a912dd16 JM	219	if (len < 24)
a912dd16 JM	220	break;
7e7a57ae	221	if (rx_duplicate(wt, hdr, len, sta, to_ap))
a912dd16	222	break;
7e7a57ae	223	rx_update_ps(wt, hdr, len, sta, to_ap);
a149fcc7 JM	224	rx_mgmt(wt, data, len);
	225	break;
	226	case WLAN_FC_TYPE_CTRL:
	227	if (len < 10)
a912dd16	228	break;
a149fcc7	229	wt->rx_ctrl++;
7e7a57ae	230	rx_update_ps(wt, hdr, len, sta, to_ap);
fb8f5fc6 JM	231	if (WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_ACK)
fb8f5fc6 JM	232	rx_ack(wt, hdr);
a149fcc7 JM	233	break;
a149fcc7 JM	234	case WLAN_FC_TYPE_DATA:
a912dd16 JM	235	if (len < 24)
a912dd16 JM	236	break;
7e7a57ae	237	if (rx_duplicate(wt, hdr, len, sta, to_ap))
a912dd16	238	break;
7e7a57ae	239	rx_update_ps(wt, hdr, len, sta, to_ap);
a149fcc7 JM	240	rx_data(wt, data, len);
	241	break;
	242	default:
	243	wpa_printf(MSG_DEBUG, "Drop RX frame with unexpected type %d",
	244	WLAN_FC_GET_TYPE(fc));
	245	break;
	246	}
fb8f5fc6 JM	247
	248	os_memcpy(wt->last_hdr, data, len > sizeof(wt->last_hdr) ?
	249	sizeof(wt->last_hdr) : len);
	250	wt->last_len = len;
a149fcc7 JM	251	}
	252
	253
	254	static void tx_status(struct wlantest wt, const u8 data, size_t len, int ack)
	255	{
	256	wpa_printf(MSG_DEBUG, "TX status: ack=%d", ack);
	257	wpa_hexdump(MSG_EXCESSIVE, "TX status frame", data, len);
	258	}
	259
	260
	261	static int check_fcs(const u8 frame, size_t frame_len, const u8 fcs)
	262	{
	263	if (WPA_GET_LE32(fcs) != crc32(frame, frame_len))
	264	return -1;
	265	return 0;
	266	}
	267
	268
	269	void wlantest_process(struct wlantest wt, const u8 data, size_t len)
	270	{
	271	struct ieee80211_radiotap_iterator iter;
	272	int ret;
	273	int rxflags = 0, txflags = 0, failed = 0, fcs = 0;
	274	const u8 frame, fcspos;
	275	size_t frame_len;
	276
	277	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
	278
	279	if (ieee80211_radiotap_iterator_init(&iter, (void *) data, len)) {
e4d99217	280	add_note(wt, MSG_INFO, "Invalid radiotap frame");
a149fcc7 JM	281	return;
	282	}
	283
	284	for (;;) {
	285	ret = ieee80211_radiotap_iterator_next(&iter);
	286	wpa_printf(MSG_EXCESSIVE, "radiotap iter: %d "
	287	"this_arg_index=%d", ret, iter.this_arg_index);
	288	if (ret == -ENOENT)
	289	break;
	290	if (ret) {
e4d99217 JM	291	add_note(wt, MSG_INFO, "Invalid radiotap header: %d",
e4d99217 JM	292	ret);
a149fcc7 JM	293	return;
	294	}
	295	switch (iter.this_arg_index) {
	296	case IEEE80211_RADIOTAP_FLAGS:
	297	if (*iter.this_arg & IEEE80211_RADIOTAP_F_FCS)
	298	fcs = 1;
	299	break;
	300	case IEEE80211_RADIOTAP_RX_FLAGS:
	301	rxflags = 1;
	302	break;
	303	case IEEE80211_RADIOTAP_TX_FLAGS:
	304	txflags = 1;
	305	failed = le_to_host16(((u16 ) iter.this_arg)) &
	306	IEEE80211_RADIOTAP_F_TX_FAIL;
	307	break;
	308
	309	}
	310	}
	311
62a0255c	312	if (iter.max_length == 8) {
e4d99217	313	add_note(wt, MSG_DEBUG, "Skip frame inserted by wlantest");
62a0255c JM	314	return;
62a0255c JM	315	}
a149fcc7 JM	316	frame = data + iter.max_length;
	317	frame_len = len - iter.max_length;
	318
	319	if (fcs && frame_len >= 4) {
	320	frame_len -= 4;
	321	fcspos = frame + frame_len;
	322	if (check_fcs(frame, frame_len, fcspos) < 0) {
e4d99217 JM	323	add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
e4d99217 JM	324	"invalid FCS");
a149fcc7 JM	325	wt->fcs_error++;
	326	return;
	327	}
	328	}
	329
	330	if (rxflags && txflags)
	331	return;
	332	if (!txflags)
	333	rx_frame(wt, frame, frame_len);
44f6d554	334	else {
e4d99217 JM	335	add_note(wt, MSG_EXCESSIVE, "TX status - process as RX of "
e4d99217 JM	336	"local frame");
a149fcc7	337	tx_status(wt, frame, frame_len, !failed);
44f6d554 JM	338	/* Process as RX frame to support local monitor interface */
	339	rx_frame(wt, frame, frame_len);
	340	}
a149fcc7	341	}
350132be JM	342
	343
	344	void wlantest_process_prism(struct wlantest wt, const u8 data, size_t len)
	345	{
	346	int fcs = 0;
	347	const u8 frame, fcspos;
	348	size_t frame_len;
	349	u32 hdrlen;
	350
	351	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
	352
	353	if (len < 8)
	354	return;
	355	hdrlen = WPA_GET_LE32(data + 4);
	356
	357	if (len < hdrlen) {
	358	wpa_printf(MSG_INFO, "Too short frame to include prism "
	359	"header");
	360	return;
	361	}
	362
	363	frame = data + hdrlen;
	364	frame_len = len - hdrlen;
	365	fcs = 1;
	366
	367	if (fcs && frame_len >= 4) {
	368	frame_len -= 4;
	369	fcspos = frame + frame_len;
	370	if (check_fcs(frame, frame_len, fcspos) < 0) {
e4d99217 JM	371	add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
e4d99217 JM	372	"invalid FCS");
350132be JM	373	wt->fcs_error++;
	374	return;
	375	}
	376	}
	377
	378	rx_frame(wt, frame, frame_len);
	379	}
0f3e4f2a JM	380
	381
	382	void wlantest_process_80211(struct wlantest wt, const u8 data, size_t len)
	383	{
	384	wpa_hexdump(MSG_EXCESSIVE, "Process data", data, len);
25315176 JM	385
	386	if (wt->assume_fcs && len >= 4) {
	387	const u8 *fcspos;
	388
	389	len -= 4;
	390	fcspos = data + len;
	391	if (check_fcs(data, len, fcspos) < 0) {
e4d99217 JM	392	add_note(wt, MSG_EXCESSIVE, "Drop RX frame with "
e4d99217 JM	393	"invalid FCS");
25315176 JM	394	wt->fcs_error++;
	395	return;
	396	}
	397	}
	398
0f3e4f2a JM	399	rx_frame(wt, data, len);
0f3e4f2a JM	400	}