[mirror_edk2.git] / NetworkPkg / TcpDxe / TcpOption.c

/** @file\r
  Routines to process TCP option.\r
\r
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "TcpMain.h"\r
\r
/**\r
  Get a UINT16 value from buffer.\r
\r
  @param[in] Buf              Pointer to input buffer.\r
\r
  @return                     The UINT16 value obtained from the buffer.\r
\r
**/\r
UINT16\r
TcpGetUint16 (\r
  IN UINT8  *Buf\r
  )\r
{\r
  UINT16  Value;\r
\r
  CopyMem (&Value, Buf, sizeof (UINT16));\r
  return NTOHS (Value);\r
}\r
\r
/**\r
  Get a UINT32 value from buffer.\r
\r
  @param[in] Buf              Pointer to input buffer.\r
\r
  @return                     The UINT32 value obtained from the buffer.\r
\r
**/\r
UINT32\r
TcpGetUint32 (\r
  IN UINT8  *Buf\r
  )\r
{\r
  UINT32  Value;\r
\r
  CopyMem (&Value, Buf, sizeof (UINT32));\r
  return NTOHL (Value);\r
}\r
\r
/**\r
  Put a UINT32 value in buffer.\r
\r
  @param[out] Buf             Pointer to the buffer.\r
  @param[in] Data             The UINT32 Date to put in the buffer.\r
\r
**/\r
VOID\r
TcpPutUint32 (\r
  OUT UINT8      *Buf,\r
  IN     UINT32  Data\r
  )\r
{\r
  Data = HTONL (Data);\r
  CopyMem (Buf, &Data, sizeof (UINT32));\r
}\r
\r
/**\r
  Compute the window scale value according to the given buffer size.\r
\r
  @param[in]  Tcb Pointer to the TCP_CB of this TCP instance.\r
\r
  @return         The scale value.\r
\r
**/\r
UINT8\r
TcpComputeScale (\r
  IN TCP_CB  *Tcb\r
  )\r
{\r
  UINT8   Scale;\r
  UINT32  BufSize;\r
\r
  ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r
\r
  BufSize = GET_RCV_BUFFSIZE (Tcb->Sk);\r
\r
  Scale = 0;\r
  while ((Scale < TCP_OPTION_MAX_WS) && ((UINT32)(TCP_OPTION_MAX_WIN << Scale) < BufSize)) {\r
    Scale++;\r
  }\r
\r
  return Scale;\r
}\r
\r
/**\r
  Build the TCP option in three-way handshake.\r
\r
  @param[in]  Tcb     Pointer to the TCP_CB of this TCP instance.\r
  @param[in]  Nbuf    Pointer to the buffer to store the options.\r
\r
  @return             The total length of the TCP option field.\r
\r
**/\r
UINT16\r
TcpSynBuildOption (\r
  IN TCP_CB   *Tcb,\r
  IN NET_BUF  *Nbuf\r
  )\r
{\r
  UINT8   *Data;\r
  UINT16  Len;\r
\r
  ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r
\r
  Len = 0;\r
\r
  //\r
  // Add a timestamp option if not disabled by the application\r
  // and it is the first SYN segment, or the peer has sent\r
  // us its timestamp.\r
  //\r
  if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_TS) &&\r
      (!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) ||\r
       TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_TS))\r
      )\r
  {\r
    Data = NetbufAllocSpace (\r
             Nbuf,\r
             TCP_OPTION_TS_ALIGNED_LEN,\r
             NET_BUF_HEAD\r
             );\r
\r
    ASSERT (Data != NULL);\r
    Len += TCP_OPTION_TS_ALIGNED_LEN;\r
\r
    TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r
    TcpPutUint32 (Data + 4, mTcpTick);\r
    TcpPutUint32 (Data + 8, 0);\r
  }\r
\r
  //\r
  // Build window scale option, only when configured\r
  // to send WS option, and either we are doing active\r
  // open or we have received WS option from peer.\r
  //\r
  if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_WS) &&\r
      (!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) ||\r
       TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_WS))\r
      )\r
  {\r
    Data = NetbufAllocSpace (\r
             Nbuf,\r
             TCP_OPTION_WS_ALIGNED_LEN,\r
             NET_BUF_HEAD\r
             );\r
\r
    ASSERT (Data != NULL);\r
\r
    Len += TCP_OPTION_WS_ALIGNED_LEN;\r
    TcpPutUint32 (Data, TCP_OPTION_WS_FAST | TcpComputeScale (Tcb));\r
  }\r
\r
  //\r
  // Build the MSS option.\r
  //\r
  Data = NetbufAllocSpace (Nbuf, TCP_OPTION_MSS_LEN, 1);\r
  ASSERT (Data != NULL);\r
\r
  Len += TCP_OPTION_MSS_LEN;\r
  TcpPutUint32 (Data, TCP_OPTION_MSS_FAST | Tcb->RcvMss);\r
\r
  return Len;\r
}\r
\r
/**\r
  Build the TCP option in synchronized states.\r
\r
  @param[in]  Tcb     Pointer to the TCP_CB of this TCP instance.\r
  @param[in]  Nbuf    Pointer to the buffer to store the options.\r
\r
  @return             The total length of the TCP option field.\r
\r
**/\r
UINT16\r
TcpBuildOption (\r
  IN TCP_CB   *Tcb,\r
  IN NET_BUF  *Nbuf\r
  )\r
{\r
  UINT8   *Data;\r
  UINT16  Len;\r
\r
  ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r
  Len = 0;\r
\r
  //\r
  // Build the Timestamp option.\r
  //\r
  if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_TS) &&\r
      !TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_RST)\r
      )\r
  {\r
    Data = NetbufAllocSpace (\r
             Nbuf,\r
             TCP_OPTION_TS_ALIGNED_LEN,\r
             NET_BUF_HEAD\r
             );\r
\r
    ASSERT (Data != NULL);\r
    Len += TCP_OPTION_TS_ALIGNED_LEN;\r
\r
    TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r
    TcpPutUint32 (Data + 4, mTcpTick);\r
    TcpPutUint32 (Data + 8, Tcb->TsRecent);\r
  }\r
\r
  return Len;\r
}\r
\r
/**\r
  Parse the supported options.\r
\r
  @param[in]       Tcp     Pointer to the TCP_CB of this TCP instance.\r
  @param[in, out]  Option  Pointer to the TCP_OPTION used to store the\r
                           successfully pasrsed options.\r
\r
  @retval          0       The options are successfully pasrsed.\r
  @retval          -1      Illegal option was found.\r
\r
**/\r
INTN\r
TcpParseOption (\r
  IN     TCP_HEAD    *Tcp,\r
  IN OUT TCP_OPTION  *Option\r
  )\r
{\r
  UINT8  *Head;\r
  UINT8  TotalLen;\r
  UINT8  Cur;\r
  UINT8  Type;\r
  UINT8  Len;\r
\r
  ASSERT ((Tcp != NULL) && (Option != NULL));\r
\r
  Option->Flag = 0;\r
\r
  TotalLen = (UINT8)((Tcp->HeadLen << 2) - sizeof (TCP_HEAD));\r
  if (TotalLen <= 0) {\r
    return 0;\r
  }\r
\r
  Head = (UINT8 *)(Tcp + 1);\r
\r
  //\r
  // Fast process of the timestamp option.\r
  //\r
  if ((TotalLen == TCP_OPTION_TS_ALIGNED_LEN) && (TcpGetUint32 (Head) == TCP_OPTION_TS_FAST)) {\r
    Option->TSVal = TcpGetUint32 (Head + 4);\r
    Option->TSEcr = TcpGetUint32 (Head + 8);\r
    Option->Flag  = TCP_OPTION_RCVD_TS;\r
\r
    return 0;\r
  }\r
\r
  //\r
  // Slow path to process the options.\r
  //\r
  Cur = 0;\r
\r
  while (Cur < TotalLen) {\r
    Type = Head[Cur];\r
\r
    switch (Type) {\r
      case TCP_OPTION_MSS:\r
        Len = Head[Cur + 1];\r
\r
        if ((Len != TCP_OPTION_MSS_LEN) || (TotalLen - Cur < TCP_OPTION_MSS_LEN)) {\r
          return -1;\r
        }\r
\r
        Option->Mss = TcpGetUint16 (&Head[Cur + 2]);\r
        TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_MSS);\r
\r
        Cur += TCP_OPTION_MSS_LEN;\r
        break;\r
\r
      case TCP_OPTION_WS:\r
        Len = Head[Cur + 1];\r
\r
        if ((Len != TCP_OPTION_WS_LEN) || (TotalLen - Cur < TCP_OPTION_WS_LEN)) {\r
          return -1;\r
        }\r
\r
        Option->WndScale = (UINT8)MIN (14, Head[Cur + 2]);\r
        TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_WS);\r
\r
        Cur += TCP_OPTION_WS_LEN;\r
        break;\r
\r
      case TCP_OPTION_TS:\r
        Len = Head[Cur + 1];\r
\r
        if ((Len != TCP_OPTION_TS_LEN) || (TotalLen - Cur < TCP_OPTION_TS_LEN)) {\r
          return -1;\r
        }\r
\r
        Option->TSVal = TcpGetUint32 (&Head[Cur + 2]);\r
        Option->TSEcr = TcpGetUint32 (&Head[Cur + 6]);\r
        TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_TS);\r
\r
        Cur += TCP_OPTION_TS_LEN;\r
        break;\r
\r
      case TCP_OPTION_NOP:\r
        Cur++;\r
        break;\r
\r
      case TCP_OPTION_EOP:\r
        Cur = TotalLen;\r
        break;\r
\r
      default:\r
        Len = Head[Cur + 1];\r
\r
        if (((TotalLen - Cur) < Len) || (Len < 2)) {\r
          return -1;\r
        }\r
\r
        Cur = (UINT8)(Cur + Len);\r
        break;\r
    }\r
  }\r
\r
  return 0;\r
}\r
Commit	Line	Data
a3bcde70 HT	1	/** @file\r
	2	Routines to process TCP option.\r
	3	\r
8343c750	4	Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
a3bcde70	5	\r
ecf98fbc	6	SPDX-License-Identifier: BSD-2-Clause-Patent\r
a3bcde70 HT	7	\r
	8	**/\r
	9	\r
	10	#include "TcpMain.h"\r
	11	\r
	12	/**\r
	13	Get a UINT16 value from buffer.\r
	14	\r
	15	@param[in] Buf Pointer to input buffer.\r
	16	\r
	17	@return The UINT16 value obtained from the buffer.\r
	18	\r
	19	**/\r
	20	UINT16\r
	21	TcpGetUint16 (\r
d1050b9d	22	IN UINT8 *Buf\r
a3bcde70 HT	23	)\r
	24	{\r
	25	UINT16 Value;\r
d1050b9d	26	\r
a3bcde70 HT	27	CopyMem (&Value, Buf, sizeof (UINT16));\r
	28	return NTOHS (Value);\r
	29	}\r
	30	\r
	31	/**\r
	32	Get a UINT32 value from buffer.\r
	33	\r
	34	@param[in] Buf Pointer to input buffer.\r
	35	\r
	36	@return The UINT32 value obtained from the buffer.\r
	37	\r
	38	**/\r
	39	UINT32\r
	40	TcpGetUint32 (\r
d1050b9d	41	IN UINT8 *Buf\r
a3bcde70 HT	42	)\r
	43	{\r
	44	UINT32 Value;\r
d1050b9d	45	\r
a3bcde70 HT	46	CopyMem (&Value, Buf, sizeof (UINT32));\r
	47	return NTOHL (Value);\r
	48	}\r
	49	\r
	50	/**\r
	51	Put a UINT32 value in buffer.\r
	52	\r
	53	@param[out] Buf Pointer to the buffer.\r
	54	@param[in] Data The UINT32 Date to put in the buffer.\r
	55	\r
	56	**/\r
	57	VOID\r
	58	TcpPutUint32 (\r
d1050b9d MK	59	OUT UINT8 *Buf,\r
d1050b9d MK	60	IN UINT32 Data\r
a3bcde70 HT	61	)\r
	62	{\r
	63	Data = HTONL (Data);\r
	64	CopyMem (Buf, &Data, sizeof (UINT32));\r
	65	}\r
	66	\r
	67	/**\r
	68	Compute the window scale value according to the given buffer size.\r
	69	\r
	70	@param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r
	71	\r
	72	@return The scale value.\r
	73	\r
	74	**/\r
	75	UINT8\r
	76	TcpComputeScale (\r
d1050b9d	77	IN TCP_CB *Tcb\r
a3bcde70 HT	78	)\r
	79	{\r
	80	UINT8 Scale;\r
	81	UINT32 BufSize;\r
	82	\r
	83	ASSERT ((Tcb != NULL) && (Tcb->Sk != NULL));\r
	84	\r
	85	BufSize = GET_RCV_BUFFSIZE (Tcb->Sk);\r
	86	\r
d1050b9d MK	87	Scale = 0;\r
d1050b9d MK	88	while ((Scale < TCP_OPTION_MAX_WS) && ((UINT32)(TCP_OPTION_MAX_WIN << Scale) < BufSize)) {\r
a3bcde70 HT	89	Scale++;\r
	90	}\r
	91	\r
	92	return Scale;\r
	93	}\r
	94	\r
	95	/**\r
	96	Build the TCP option in three-way handshake.\r
	97	\r
	98	@param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r
	99	@param[in] Nbuf Pointer to the buffer to store the options.\r
	100	\r
	101	@return The total length of the TCP option field.\r
	102	\r
	103	**/\r
	104	UINT16\r
	105	TcpSynBuildOption (\r
d1050b9d MK	106	IN TCP_CB *Tcb,\r
d1050b9d MK	107	IN NET_BUF *Nbuf\r
a3bcde70 HT	108	)\r
	109	{\r
	110	UINT8 *Data;\r
	111	UINT16 Len;\r
	112	\r
	113	ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r
	114	\r
	115	Len = 0;\r
	116	\r
	117	//\r
	118	// Add a timestamp option if not disabled by the application\r
	119	// and it is the first SYN segment, or the peer has sent\r
	120	// us its timestamp.\r
	121	//\r
	122	if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_TS) &&\r
	123	(!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) \|\|\r
d1050b9d MK	124	TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_TS))\r
	125	)\r
	126	{\r
a3bcde70 HT	127	Data = NetbufAllocSpace (\r
	128	Nbuf,\r
	129	TCP_OPTION_TS_ALIGNED_LEN,\r
	130	NET_BUF_HEAD\r
	131	);\r
	132	\r
	133	ASSERT (Data != NULL);\r
	134	Len += TCP_OPTION_TS_ALIGNED_LEN;\r
	135	\r
	136	TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r
	137	TcpPutUint32 (Data + 4, mTcpTick);\r
	138	TcpPutUint32 (Data + 8, 0);\r
	139	}\r
	140	\r
	141	//\r
	142	// Build window scale option, only when configured\r
	143	// to send WS option, and either we are doing active\r
	144	// open or we have received WS option from peer.\r
	145	//\r
	146	if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_WS) &&\r
	147	(!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_ACK) \|\|\r
d1050b9d MK	148	TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RCVD_WS))\r
	149	)\r
	150	{\r
a3bcde70 HT	151	Data = NetbufAllocSpace (\r
	152	Nbuf,\r
	153	TCP_OPTION_WS_ALIGNED_LEN,\r
	154	NET_BUF_HEAD\r
	155	);\r
	156	\r
	157	ASSERT (Data != NULL);\r
	158	\r
	159	Len += TCP_OPTION_WS_ALIGNED_LEN;\r
	160	TcpPutUint32 (Data, TCP_OPTION_WS_FAST \| TcpComputeScale (Tcb));\r
	161	}\r
	162	\r
	163	//\r
	164	// Build the MSS option.\r
	165	//\r
	166	Data = NetbufAllocSpace (Nbuf, TCP_OPTION_MSS_LEN, 1);\r
	167	ASSERT (Data != NULL);\r
	168	\r
	169	Len += TCP_OPTION_MSS_LEN;\r
	170	TcpPutUint32 (Data, TCP_OPTION_MSS_FAST \| Tcb->RcvMss);\r
	171	\r
	172	return Len;\r
	173	}\r
	174	\r
	175	/**\r
	176	Build the TCP option in synchronized states.\r
	177	\r
	178	@param[in] Tcb Pointer to the TCP_CB of this TCP instance.\r
	179	@param[in] Nbuf Pointer to the buffer to store the options.\r
	180	\r
	181	@return The total length of the TCP option field.\r
	182	\r
	183	**/\r
	184	UINT16\r
	185	TcpBuildOption (\r
d1050b9d MK	186	IN TCP_CB *Tcb,\r
d1050b9d MK	187	IN NET_BUF *Nbuf\r
a3bcde70 HT	188	)\r
	189	{\r
	190	UINT8 *Data;\r
	191	UINT16 Len;\r
	192	\r
	193	ASSERT ((Tcb != NULL) && (Nbuf != NULL) && (Nbuf->Tcp == NULL));\r
	194	Len = 0;\r
	195	\r
	196	//\r
	197	// Build the Timestamp option.\r
	198	//\r
	199	if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_SND_TS) &&\r
	200	!TCP_FLG_ON (TCPSEG_NETBUF (Nbuf)->Flag, TCP_FLG_RST)\r
d1050b9d MK	201	)\r
d1050b9d MK	202	{\r
a3bcde70	203	Data = NetbufAllocSpace (\r
d1050b9d MK	204	Nbuf,\r
	205	TCP_OPTION_TS_ALIGNED_LEN,\r
	206	NET_BUF_HEAD\r
	207	);\r
a3bcde70 HT	208	\r
	209	ASSERT (Data != NULL);\r
	210	Len += TCP_OPTION_TS_ALIGNED_LEN;\r
	211	\r
	212	TcpPutUint32 (Data, TCP_OPTION_TS_FAST);\r
	213	TcpPutUint32 (Data + 4, mTcpTick);\r
	214	TcpPutUint32 (Data + 8, Tcb->TsRecent);\r
	215	}\r
	216	\r
	217	return Len;\r
	218	}\r
	219	\r
	220	/**\r
	221	Parse the supported options.\r
	222	\r
	223	@param[in] Tcp Pointer to the TCP_CB of this TCP instance.\r
	224	@param[in, out] Option Pointer to the TCP_OPTION used to store the\r
	225	successfully pasrsed options.\r
	226	\r
	227	@retval 0 The options are successfully pasrsed.\r
81c6f176	228	@retval -1 Illegal option was found.\r
a3bcde70 HT	229	\r
	230	**/\r
	231	INTN\r
	232	TcpParseOption (\r
d1050b9d MK	233	IN TCP_HEAD *Tcp,\r
d1050b9d MK	234	IN OUT TCP_OPTION *Option\r
a3bcde70 HT	235	)\r
a3bcde70 HT	236	{\r
d1050b9d MK	237	UINT8 *Head;\r
	238	UINT8 TotalLen;\r
	239	UINT8 Cur;\r
	240	UINT8 Type;\r
	241	UINT8 Len;\r
a3bcde70 HT	242	\r
	243	ASSERT ((Tcp != NULL) && (Option != NULL));\r
	244	\r
d1050b9d	245	Option->Flag = 0;\r
a3bcde70	246	\r
d1050b9d	247	TotalLen = (UINT8)((Tcp->HeadLen << 2) - sizeof (TCP_HEAD));\r
a3bcde70 HT	248	if (TotalLen <= 0) {\r
	249	return 0;\r
	250	}\r
	251	\r
d1050b9d	252	Head = (UINT8 *)(Tcp + 1);\r
a3bcde70 HT	253	\r
	254	//\r
	255	// Fast process of the timestamp option.\r
	256	//\r
	257	if ((TotalLen == TCP_OPTION_TS_ALIGNED_LEN) && (TcpGetUint32 (Head) == TCP_OPTION_TS_FAST)) {\r
a3bcde70 HT	258	Option->TSVal = TcpGetUint32 (Head + 4);\r
	259	Option->TSEcr = TcpGetUint32 (Head + 8);\r
	260	Option->Flag = TCP_OPTION_RCVD_TS;\r
	261	\r
	262	return 0;\r
	263	}\r
d1050b9d	264	\r
a3bcde70 HT	265	//\r
	266	// Slow path to process the options.\r
	267	//\r
	268	Cur = 0;\r
	269	\r
	270	while (Cur < TotalLen) {\r
	271	Type = Head[Cur];\r
	272	\r
	273	switch (Type) {\r
d1050b9d MK	274	case TCP_OPTION_MSS:\r
d1050b9d MK	275	Len = Head[Cur + 1];\r
a3bcde70	276	\r
d1050b9d MK	277	if ((Len != TCP_OPTION_MSS_LEN) \|\| (TotalLen - Cur < TCP_OPTION_MSS_LEN)) {\r
	278	return -1;\r
	279	}\r
a3bcde70	280	\r
d1050b9d MK	281	Option->Mss = TcpGetUint16 (&Head[Cur + 2]);\r
d1050b9d MK	282	TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_MSS);\r
a3bcde70	283	\r
d1050b9d MK	284	Cur += TCP_OPTION_MSS_LEN;\r
d1050b9d MK	285	break;\r
a3bcde70	286	\r
d1050b9d MK	287	case TCP_OPTION_WS:\r
d1050b9d MK	288	Len = Head[Cur + 1];\r
a3bcde70	289	\r
d1050b9d MK	290	if ((Len != TCP_OPTION_WS_LEN) \|\| (TotalLen - Cur < TCP_OPTION_WS_LEN)) {\r
	291	return -1;\r
	292	}\r
a3bcde70	293	\r
d1050b9d MK	294	Option->WndScale = (UINT8)MIN (14, Head[Cur + 2]);\r
d1050b9d MK	295	TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_WS);\r
a3bcde70	296	\r
d1050b9d MK	297	Cur += TCP_OPTION_WS_LEN;\r
d1050b9d MK	298	break;\r
a3bcde70	299	\r
d1050b9d MK	300	case TCP_OPTION_TS:\r
d1050b9d MK	301	Len = Head[Cur + 1];\r
a3bcde70	302	\r
d1050b9d MK	303	if ((Len != TCP_OPTION_TS_LEN) \|\| (TotalLen - Cur < TCP_OPTION_TS_LEN)) {\r
	304	return -1;\r
	305	}\r
a3bcde70	306	\r
d1050b9d MK	307	Option->TSVal = TcpGetUint32 (&Head[Cur + 2]);\r
	308	Option->TSEcr = TcpGetUint32 (&Head[Cur + 6]);\r
	309	TCP_SET_FLG (Option->Flag, TCP_OPTION_RCVD_TS);\r
a3bcde70	310	\r
d1050b9d MK	311	Cur += TCP_OPTION_TS_LEN;\r
d1050b9d MK	312	break;\r
a3bcde70	313	\r
d1050b9d MK	314	case TCP_OPTION_NOP:\r
	315	Cur++;\r
	316	break;\r
a3bcde70	317	\r
d1050b9d MK	318	case TCP_OPTION_EOP:\r
	319	Cur = TotalLen;\r
	320	break;\r
a3bcde70	321	\r
d1050b9d MK	322	default:\r
d1050b9d MK	323	Len = Head[Cur + 1];\r
a3bcde70	324	\r
d1050b9d MK	325	if (((TotalLen - Cur) < Len) \|\| (Len < 2)) {\r
	326	return -1;\r
	327	}\r
a3bcde70	328	\r
d1050b9d MK	329	Cur = (UINT8)(Cur + Len);\r
d1050b9d MK	330	break;\r
a3bcde70	331	}\r
a3bcde70 HT	332	}\r
	333	\r
	334	return 0;\r
	335	}\r