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2024-05-11 297b60346df8beafee954a0fd7c2d64f33f3b9bc 
 kernel/drivers/net/wireless/rockchip_wlan/cywdhd/bcmdhd/dhd_ip.c
....@@ -1,15 +1,16 @@
1
-/* SPDX-License-Identifier: GPL-2.0 */
21 /*
32  * IP Packet Parser Module.
43  *
5
- * Copyright (C) 1999-2019, Broadcom Corporation
6
- * 
4
+ * Portions of this code are copyright (c) 2022 Cypress Semiconductor Corporation
5
+ *
6
+ * Copyright (C) 1999-2017, Broadcom Corporation
7
+ *
78  *      Unless you and Broadcom execute a separate written software license
89  * agreement governing use of this software, this software is licensed to you
910  * under the terms of the GNU General Public License version 2 (the "GPL"),
1011  * available at http://www.broadcom.com/licenses/GPLv2.php, with the
1112  * following added to such license:
12
- * 
13
+ *
1314  *      As a special exception, the copyright holders of this software give you
1415  * permission to link this software with independent modules, and to copy and
1516  * distribute the resulting executable under terms of your choice, provided that
....@@ -17,7 +18,7 @@
1718  * the license of that module.  An independent module is a module which is not
1819  * derived from this software.  The special exception does not apply to any
1920  * modifications of the software.
20
- * 
21
+ *
2122  *      Notwithstanding the above, under no circumstances may you combine this
2223  * software in any way with any other Broadcom software provided under a license
2324  * other than the GPL, without Broadcom's express prior written consent.
....@@ -25,26 +26,26 @@
2526  *
2627  * <<Broadcom-WL-IPTag/Open:>>
2728  *
28
- * $Id: dhd_ip.c 709309 2019-01-17 09:04:00Z $
29
+ * $Id: dhd_ip.c 700444 2017-05-19 06:38:00Z $
2930  */
3031 #include <typedefs.h>
3132 #include <osl.h>
3233 
33
-#include <proto/ethernet.h>
34
-#include <proto/vlan.h>
35
-#include <proto/802.3.h>
36
-#include <proto/bcmip.h>
34
+#include <ethernet.h>
35
+#include <vlan.h>
36
+#include <802.3.h>
37
+#include <bcmip.h>
3738 #include <bcmendian.h>
3839 
3940 #include <dhd_dbg.h>
4041 
4142 #include <dhd_ip.h>
4243 
43
-#ifdef DHDTCPACK_SUPPRESS
44
+#if defined(DHDTCPACK_SUPPRESS) || defined(DHDTCPSYNC_FLOOD_BLK)
4445 #include <dhd_bus.h>
4546 #include <dhd_proto.h>
46
-#include <proto/bcmtcp.h>
47
-#endif /* DHDTCPACK_SUPPRESS */
47
+#include <bcmtcp.h>
48
+#endif /* DHDTCPACK_SUPPRESS || DHDTCPSYNC_FLOOD_BLK */
4849 
4950 /* special values */
5051 /* 802.3 llc/snap header */
....@@ -128,7 +129,15 @@
128129 	int ifidx;
129130 	uint8 supp_cnt;
130131 	dhd_pub_t *dhdp;
131
-	struct timer_list timer;
132
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
133
+	timer_list_compat_t timer;
134
+#else
135
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(5, 1, 21))
136
+	struct tasklet_hrtimer timer;
137
+#else
138
+	struct hrtimer timer;
139
+#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(5, 1, 21) */
140
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
132141 } tcpack_info_t;
133142 
134143 typedef struct _tdata_psh_info_t {
....@@ -182,7 +191,7 @@
182191 	tcpack_sup_mod->tdata_psh_info_free = tdata_psh_info;
183192 #ifdef DHDTCPACK_SUP_DBG
184193 	tcpack_sup_mod->psh_info_enq_num++;
185
-#endif
194
+#endif // endif
186195 }
187196 
188197 static tdata_psh_info_t*
....@@ -290,44 +299,54 @@
290299 }
291300 #endif /* BCMSDIO */
292301 
293
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
294
-static void dhd_tcpack_send(struct timer_list *t)
295
-{
296
-	tcpack_info_t *cur_tbl = from_timer(cur_tbl, t, timer);
297
-#else
302
+#ifdef BCMPCIE
303
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
298304 static void dhd_tcpack_send(ulong data)
305
+#else
306
+static enum hrtimer_restart dhd_tcpack_send(struct hrtimer *timer)
307
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
299308 {
300
-	tcpack_info_t *cur_tbl = (tcpack_info_t *)data;
301
-#endif
302309 	tcpack_sup_module_t *tcpack_sup_mod;
310
+	tcpack_info_t *cur_tbl;
303311 	dhd_pub_t *dhdp;
304312 	int ifidx;
305313 	void* pkt;
306314 	unsigned long flags;
307315 
316
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
317
+	cur_tbl = (tcpack_info_t *)data;
318
+#else
319
+	cur_tbl = container_of(timer, tcpack_info_t, timer.timer);
320
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
321
+
308322 	if (!cur_tbl) {
309
-		return;
323
+		goto done;
310324 	}
311325 
312326 	dhdp = cur_tbl->dhdp;
313327 	if (!dhdp) {
314
-		return;
328
+		goto done;
315329 	}
316330 
317331 	flags = dhd_os_tcpacklock(dhdp);
332
+
333
+	if (unlikely(dhdp->tcpack_sup_mode != TCPACK_SUP_HOLD)) {
334
+		dhd_os_tcpackunlock(dhdp, flags);
335
+		goto done;
336
+	}
318337 
319338 	tcpack_sup_mod = dhdp->tcpack_sup_module;
320339 	if (!tcpack_sup_mod) {
321340 		DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n",
322341 			__FUNCTION__, __LINE__));
323342 		dhd_os_tcpackunlock(dhdp, flags);
324
-		return;
343
+		goto done;
325344 	}
326345 	pkt = cur_tbl->pkt_in_q;
327346 	ifidx = cur_tbl->ifidx;
328347 	if (!pkt) {
329348 		dhd_os_tcpackunlock(dhdp, flags);
330
-		return;
349
+		goto done;
331350 	}
332351 	cur_tbl->pkt_in_q = NULL;
333352 	cur_tbl->pkt_ether_hdr = NULL;
....@@ -341,99 +360,169 @@
341360 	dhd_os_tcpackunlock(dhdp, flags);
342361 
343362 	dhd_sendpkt(dhdp, ifidx, pkt);
363
+
364
+done:
365
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
366
+	return;
367
+#else
368
+	return HRTIMER_NORESTART;
369
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
344370 }
371
+#endif /* BCMPCIE */
345372 
346373 int dhd_tcpack_suppress_set(dhd_pub_t *dhdp, uint8 mode)
347374 {
348375 	int ret = BCME_OK;
349376 	unsigned long flags;
377
+	tcpack_sup_module_t *tcpack_sup_module;
378
+	uint8 invalid_mode = FALSE;
379
+	int prev_mode;
380
+	int i = 0;
350381 
351382 	flags = dhd_os_tcpacklock(dhdp);
383
+	tcpack_sup_module = dhdp->tcpack_sup_module;
384
+	prev_mode = dhdp->tcpack_sup_mode;
352385 
353
-	if (dhdp->tcpack_sup_mode == mode) {
386
+	if (prev_mode == mode) {
354387 		DHD_ERROR(("%s %d: already set to %d\n", __FUNCTION__, __LINE__, mode));
355388 		goto exit;
356389 	}
357390 
358
-	if (mode >= TCPACK_SUP_LAST_MODE ||
359
-#ifndef BCMSDIO
360
-		mode == TCPACK_SUP_DELAYTX ||
361
-#endif /* !BCMSDIO */
362
-		FALSE) {
363
-		DHD_ERROR(("%s %d: Invalid mode %d\n", __FUNCTION__, __LINE__, mode));
391
+	invalid_mode |= (mode >= TCPACK_SUP_LAST_MODE);
392
+#ifdef BCMSDIO
393
+	invalid_mode |= (mode == TCPACK_SUP_HOLD);
394
+#endif /* BCMSDIO */
395
+#ifdef BCMPCIE
396
+	invalid_mode |= ((mode == TCPACK_SUP_REPLACE) || (mode == TCPACK_SUP_DELAYTX));
397
+#endif /* BCMPCIE */
398
+
399
+	if (invalid_mode) {
400
+		DHD_ERROR(("%s %d: Invalid TCP ACK Suppress mode %d\n",
401
+			__FUNCTION__, __LINE__, mode));
364402 		ret = BCME_BADARG;
365403 		goto exit;
366404 	}
367405 
368
-	DHD_TRACE(("%s: %d -> %d\n",
406
+	DHD_TRACE(("%s: TCP ACK Suppress mode %d -> mode %d\n",
369407 		__FUNCTION__, dhdp->tcpack_sup_mode, mode));
370408 
409
+	/* Pre-process routines to change a new mode as per previous mode */
410
+	switch (prev_mode) {
411
+		case TCPACK_SUP_OFF:
412
+			if (tcpack_sup_module == NULL) {
413
+				tcpack_sup_module = MALLOC(dhdp->osh, sizeof(tcpack_sup_module_t));
414
+				if (tcpack_sup_module == NULL) {
415
+					DHD_ERROR(("%s[%d]: Failed to allocate the new memory for "
416
+						"tcpack_sup_module\n", __FUNCTION__, __LINE__));
417
+					dhdp->tcpack_sup_mode = TCPACK_SUP_OFF;
418
+					ret = BCME_NOMEM;
419
+					goto exit;
420
+				}
421
+				dhdp->tcpack_sup_module = tcpack_sup_module;
422
+			}
423
+			bzero(tcpack_sup_module, sizeof(tcpack_sup_module_t));
424
+			break;
371425 #ifdef BCMSDIO
372
-	/* Old tcpack_sup_mode is TCPACK_SUP_DELAYTX */
373
-	if (dhdp->tcpack_sup_mode == TCPACK_SUP_DELAYTX) {
374
-		tcpack_sup_module_t *tcpack_sup_mod = dhdp->tcpack_sup_module;
375
-		/* We won't need tdata_psh_info pool and tcpddata_info_tbl anymore */
376
-		_tdata_psh_info_pool_deinit(dhdp, tcpack_sup_mod);
377
-		tcpack_sup_mod->tcpdata_info_cnt = 0;
378
-		bzero(tcpack_sup_mod->tcpdata_info_tbl,
379
-			sizeof(tcpdata_info_t) * TCPDATA_INFO_MAXNUM);
380
-		/* For half duplex bus interface, tx precedes rx by default */
381
-		if (dhdp->bus)
382
-			dhd_bus_set_dotxinrx(dhdp->bus, TRUE);
383
-	}
426
+		case TCPACK_SUP_DELAYTX:
427
+			if (tcpack_sup_module) {
428
+				/* We won't need tdata_psh_info pool and
429
+				 * tcpddata_info_tbl anymore
430
+				 */
431
+				_tdata_psh_info_pool_deinit(dhdp, tcpack_sup_module);
432
+				tcpack_sup_module->tcpdata_info_cnt = 0;
433
+				bzero(tcpack_sup_module->tcpdata_info_tbl,
434
+					sizeof(tcpdata_info_t) * TCPDATA_INFO_MAXNUM);
435
+			}
436
+
437
+			/* For half duplex bus interface, tx precedes rx by default */
438
+			if (dhdp->bus) {
439
+				dhd_bus_set_dotxinrx(dhdp->bus, TRUE);
440
+			}
441
+
442
+			if (tcpack_sup_module == NULL) {
443
+				DHD_ERROR(("%s[%d]: tcpack_sup_module should not be NULL\n",
444
+					__FUNCTION__, __LINE__));
445
+				dhdp->tcpack_sup_mode = TCPACK_SUP_OFF;
446
+				goto exit;
447
+			}
448
+			break;
384449 #endif /* BCMSDIO */
450
+	}
451
+
452
+	/* Update a new mode */
385453 	dhdp->tcpack_sup_mode = mode;
386454 
387
-	if (mode == TCPACK_SUP_OFF) {
388
-		ASSERT(dhdp->tcpack_sup_module != NULL);
389
-		/* Clean up timer/data structure for any remaining/pending packet or timer. */
390
-		dhd_tcpack_info_tbl_clean(dhdp);
391
-		MFREE(dhdp->osh, dhdp->tcpack_sup_module, sizeof(tcpack_sup_module_t));
392
-		dhdp->tcpack_sup_module = NULL;
393
-		goto exit;
394
-	}
395
-
396
-	if (dhdp->tcpack_sup_module == NULL) {
397
-		tcpack_sup_module_t *tcpack_sup_mod =
398
-			MALLOC(dhdp->osh, sizeof(tcpack_sup_module_t));
399
-		if (tcpack_sup_mod == NULL) {
400
-			DHD_ERROR(("%s %d: No MEM\n", __FUNCTION__, __LINE__));
401
-			dhdp->tcpack_sup_mode = TCPACK_SUP_OFF;
402
-			ret = BCME_NOMEM;
403
-			goto exit;
404
-		}
405
-		bzero(tcpack_sup_mod, sizeof(tcpack_sup_module_t));
406
-		dhdp->tcpack_sup_module = tcpack_sup_mod;
407
-	}
408
-
409
-#ifdef BCMSDIO
410
-	if (mode == TCPACK_SUP_DELAYTX) {
411
-		ret = _tdata_psh_info_pool_init(dhdp, dhdp->tcpack_sup_module);
412
-		if (ret != BCME_OK)
413
-			DHD_ERROR(("%s %d: pool init fail with %d\n", __FUNCTION__, __LINE__, ret));
414
-		else if (dhdp->bus)
415
-			dhd_bus_set_dotxinrx(dhdp->bus, FALSE);
416
-	}
417
-#endif /* BCMSDIO */
418
-
419
-	if (mode == TCPACK_SUP_HOLD) {
420
-		int i;
421
-		tcpack_sup_module_t *tcpack_sup_mod =
422
-			(tcpack_sup_module_t *)dhdp->tcpack_sup_module;
423
-		dhdp->tcpack_sup_ratio = CUSTOM_TCPACK_SUPP_RATIO;
424
-		dhdp->tcpack_sup_delay = CUSTOM_TCPACK_DELAY_TIME;
425
-		for (i = 0; i < TCPACK_INFO_MAXNUM; i++)
426
-		{
427
-			tcpack_sup_mod->tcpack_info_tbl[i].dhdp = dhdp;
428
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0))
429
-			timer_setup((struct timer_list *)&tcpack_sup_mod->tcpack_info_tbl[i].timer, dhd_tcpack_send, 0);
455
+	/* Process for a new mode */
456
+	switch (mode) {
457
+		case TCPACK_SUP_OFF:
458
+			ASSERT(tcpack_sup_module != NULL);
459
+			/* Clean up timer/data structure for
460
+			 * any remaining/pending packet or timer.
461
+			 */
462
+			if (tcpack_sup_module) {
463
+				/* Check if previous mode is TCAPACK_SUP_HOLD */
464
+				if (prev_mode == TCPACK_SUP_HOLD) {
465
+					for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
466
+						tcpack_info_t *tcpack_info_tbl =
467
+							&tcpack_sup_module->tcpack_info_tbl[i];
468
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
469
+						del_timer(&tcpack_info_tbl->timer);
430470 #else
431
-			init_timer(&tcpack_sup_mod->tcpack_info_tbl[i].timer);
432
-			tcpack_sup_mod->tcpack_info_tbl[i].timer.data =
433
-				(ulong)&tcpack_sup_mod->tcpack_info_tbl[i];
434
-			tcpack_sup_mod->tcpack_info_tbl[i].timer.function = dhd_tcpack_send;
435
-#endif
436
-		}
471
+						hrtimer_cancel(&tcpack_info_tbl->timer.timer);
472
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
473
+						if (tcpack_info_tbl->pkt_in_q) {
474
+							PKTFREE(dhdp->osh,
475
+								tcpack_info_tbl->pkt_in_q, TRUE);
476
+							tcpack_info_tbl->pkt_in_q = NULL;
477
+						}
478
+					}
479
+				}
480
+				MFREE(dhdp->osh, tcpack_sup_module, sizeof(tcpack_sup_module_t));
481
+				dhdp->tcpack_sup_module = NULL;
482
+			} else {
483
+				DHD_ERROR(("%s[%d]: tcpack_sup_module should not be NULL\n",
484
+					__FUNCTION__, __LINE__));
485
+			}
486
+			break;
487
+#ifdef BCMSDIO
488
+		case TCPACK_SUP_REPLACE:
489
+			/* There is nothing to configure for this mode */
490
+			break;
491
+		case TCPACK_SUP_DELAYTX:
492
+			ret = _tdata_psh_info_pool_init(dhdp, tcpack_sup_module);
493
+			if (ret != BCME_OK) {
494
+				DHD_ERROR(("%s %d: pool init fail with %d\n",
495
+					__FUNCTION__, __LINE__, ret));
496
+				break;
497
+			}
498
+			if (dhdp->bus) {
499
+				dhd_bus_set_dotxinrx(dhdp->bus, FALSE);
500
+			}
501
+			break;
502
+#endif /* BCMSDIO */
503
+#ifdef BCMPCIE
504
+		case TCPACK_SUP_HOLD:
505
+			dhdp->tcpack_sup_ratio = CUSTOM_TCPACK_SUPP_RATIO;
506
+			dhdp->tcpack_sup_delay = CUSTOM_TCPACK_DELAY_TIME;
507
+			for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
508
+				tcpack_info_t *tcpack_info_tbl =
509
+					&tcpack_sup_module->tcpack_info_tbl[i];
510
+				tcpack_info_tbl->dhdp = dhdp;
511
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
512
+				init_timer_compat(&tcpack_info_tbl->timer,
513
+					dhd_tcpack_send, tcpack_info_tbl);
514
+#else
515
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(5, 1, 21))
516
+				tasklet_hrtimer_init(&tcpack_info_tbl->timer,
517
+					dhd_tcpack_send, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
518
+#else
519
+				hrtimer_init(&tcpack_info_tbl->timer, CLOCK_MONOTONIC,
520
+					HRTIMER_MODE_REL_SOFT);
521
+#endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(5, 1, 21) */
522
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
523
+			}
524
+			break;
525
+#endif /* BCMPCIE */
437526 	}
438527 
439528 exit:
....@@ -480,7 +569,11 @@
480569 
481570 	if (dhdp->tcpack_sup_mode == TCPACK_SUP_HOLD) {
482571 		for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
572
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
483573 			del_timer_sync(&tcpack_sup_mod->tcpack_info_tbl[i].timer);
574
+#else
575
+			hrtimer_cancel(&tcpack_sup_mod->tcpack_info_tbl[i].timer.timer);
576
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
484577 		}
485578 	}
486579 
....@@ -649,7 +742,6 @@
649742 	bool ret = FALSE;
650743 	bool set_dotxinrx = TRUE;
651744 	unsigned long flags;
652
-
653745 
654746 	if (dhdp->tcpack_sup_mode == TCPACK_SUP_OFF)
655747 		goto exit;
....@@ -1193,7 +1285,7 @@
11931285 	for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
11941286 		void *oldpkt;	/* TCPACK packet that is already in txq or DelayQ */
11951287 		uint8 *old_ether_hdr, *old_ip_hdr, *old_tcp_hdr;
1196
-		uint32 old_ip_hdr_len, old_tcp_hdr_len;
1288
+		uint32 old_ip_hdr_len;
11971289 		uint32 old_tcpack_num;	/* TCP ACK number of old TCPACK packet in Q */
11981290 
11991291 		if ((oldpkt = tcpack_info_tbl[i].pkt_in_q) == NULL) {
....@@ -1215,7 +1307,6 @@
12151307 		old_ip_hdr = old_ether_hdr + ETHER_HDR_LEN;
12161308 		old_ip_hdr_len = IPV4_HLEN(old_ip_hdr);
12171309 		old_tcp_hdr = old_ip_hdr + old_ip_hdr_len;
1218
-		old_tcp_hdr_len = 4 * TCP_HDRLEN(old_tcp_hdr[TCP_HLEN_OFFSET]);
12191310 
12201311 		DHD_TRACE(("%s %d: oldpkt %p[%d], IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR
12211312 			" TCP port %d %d\n", __FUNCTION__, __LINE__, oldpkt, i,
....@@ -1254,7 +1345,11 @@
12541345 		dhd_os_tcpackunlock(dhdp, flags);
12551346 
12561347 		if (!hold) {
1348
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
12571349 			del_timer_sync(&tcpack_info_tbl[i].timer);
1350
+#else
1351
+			hrtimer_cancel(&tcpack_sup_mod->tcpack_info_tbl[i].timer.timer);
1352
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
12581353 		}
12591354 		goto exit;
12601355 	}
....@@ -1271,8 +1366,18 @@
12711366 		tcpack_info_tbl[free_slot].pkt_ether_hdr = new_ether_hdr;
12721367 		tcpack_info_tbl[free_slot].ifidx = ifidx;
12731368 		tcpack_info_tbl[free_slot].supp_cnt = 1;
1369
+#ifndef TCPACK_SUPPRESS_HOLD_HRT
12741370 		mod_timer(&tcpack_sup_mod->tcpack_info_tbl[free_slot].timer,
12751371 			jiffies + msecs_to_jiffies(dhdp->tcpack_sup_delay));
1372
+#else
1373
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(5, 1, 21)
1374
+		tasklet_hrtimer_start(&tcpack_sup_mod->tcpack_info_tbl[free_slot].timer,
1375
+			ktime_set(0, dhdp->tcpack_sup_delay*1000000), HRTIMER_MODE_REL);
1376
+#else
1377
+		hrtimer_start(&tcpack_sup_mod->tcpack_info_tbl[free_slot].timer,
1378
+			ktime_set(0, dhdp->tcpack_sup_delay*1000000), HRTIMER_MODE_REL_SOFT);
1379
+#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0) */
1380
+#endif /* TCPACK_SUPPRESS_HOLD_HRT */
12761381 		tcpack_sup_mod->tcpack_info_cnt++;
12771382 	} else {
12781383 		DHD_TRACE(("%s %d: No empty tcp ack info tbl\n",
....@@ -1284,3 +1389,54 @@
12841389 	return hold;
12851390 }
12861391 #endif /* DHDTCPACK_SUPPRESS */
1392
+
1393
+#ifdef DHDTCPSYNC_FLOOD_BLK
1394
+tcp_hdr_flag_t
1395
+dhd_tcpdata_get_flag(dhd_pub_t *dhdp, void *pkt)
1396
+{
1397
+	uint8 *ether_hdr;	/* Ethernet header of the new packet */
1398
+	uint16 ether_type;	/* Ethernet type of the new packet */
1399
+	uint8 *ip_hdr;		/* IP header of the new packet */
1400
+	uint8 *tcp_hdr;		/* TCP header of the new packet */
1401
+	uint32 ip_hdr_len;	/* IP header length of the new packet */
1402
+	uint32 cur_framelen;
1403
+	uint8 flags;
1404
+
1405
+	ether_hdr = PKTDATA(dhdp->osh, pkt);
1406
+	cur_framelen = PKTLEN(dhdp->osh, pkt);
1407
+
1408
+	ether_type = ether_hdr[12] << 8 | ether_hdr[13];
1409
+
1410
+	if (ether_type != ETHER_TYPE_IP) {
1411
+		DHD_TRACE(("%s %d: Not a IP packet 0x%x\n",
1412
+			__FUNCTION__, __LINE__, ether_type));
1413
+		return FLAG_OTHERS;
1414
+	}
1415
+
1416
+	ip_hdr = ether_hdr + ETHER_HDR_LEN;
1417
+	cur_framelen -= ETHER_HDR_LEN;
1418
+
1419
+	if (cur_framelen < IPV4_MIN_HEADER_LEN) {
1420
+		return FLAG_OTHERS;
1421
+	}
1422
+
1423
+	ip_hdr_len = IPV4_HLEN(ip_hdr);
1424
+	if (IP_VER(ip_hdr) != IP_VER_4 || IPV4_PROT(ip_hdr) != IP_PROT_TCP) {
1425
+		DHD_TRACE(("%s %d: Not IPv4 nor TCP! ip ver %d, prot %d\n",
1426
+			__FUNCTION__, __LINE__, IP_VER(ip_hdr), IPV4_PROT(ip_hdr)));
1427
+		return FLAG_OTHERS;
1428
+	}
1429
+
1430
+	tcp_hdr = ip_hdr + ip_hdr_len;
1431
+
1432
+	flags = (uint8)tcp_hdr[TCP_FLAGS_OFFSET];
1433
+
1434
+	if (flags & TCP_FLAG_SYN) {
1435
+		if (flags & TCP_FLAG_ACK) {
1436
+			return FLAG_SYNCACK;
1437
+		}
1438
+		return FLAG_SYNC;
1439
+	}
1440
+	return FLAG_OTHERS;
1441
+}
1442
+#endif /* DHDTCPSYNC_FLOOD_BLK */