?? net_icmp.c
字號:
pmsg_req_hdr->TotLen = (NET_BUF_SIZE)pmsg_req_hdr->ICMP_MsgLen;
pmsg_req_hdr->ProtocolHdrType = NET_PROTOCOL_TYPE_ICMP;
msg_ix_data = msg_ix + msg_size_hdr;
if (msg_size_data > 0) { /* Copy data into ICMP req tx buf. */
NetBuf_DataWr((NET_BUF *) pmsg_req,
(NET_BUF_SIZE) msg_ix_data,
(NET_BUF_SIZE) msg_size_data,
(CPU_INT08U *) p_data,
(NET_ERR *)&err);
if (err != NET_BUF_ERR_NONE) {
NetICMP_TxPktDiscard(pmsg_req, perr);
return (id_seq);
}
pmsg_req_hdr->DataIx = (CPU_INT16U )msg_ix_data;
pmsg_req_hdr->DataLen = (NET_BUF_SIZE)msg_size_data;
#if 0 /* Init'd in NetBuf_Get() [see Note #6]. */
} else {
pmsg_req_hdr->DataIx = NET_BUF_IX_NONE;
pmsg_req_hdr->DataLen = 0;
#endif
}
/*$PAGE*/
/* --------------- PREPARE ICMP REQ MSG --------------- */
NET_ICMP_TX_GET_SEQ_NBR(msg_seq_nbr);
switch (type) {
case NET_ICMP_MSG_TYPE_ECHO_REQ:
picmp_hdr_echo = (NET_ICMP_HDR_ECHO *)&pmsg_req->Data[pmsg_req_hdr->ICMP_MsgIx];
picmp_hdr_echo->Type = NET_ICMP_MSG_TYPE_ECHO_REQ;
picmp_hdr_echo->Code = NET_ICMP_MSG_CODE_ECHO_REQ;
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_echo->ID, &id);
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_echo->SeqNbr, &msg_seq_nbr);
/* Calc ICMP msg chk sum (see Note #7). */
NET_UTIL_VAL_SET_NET_16(&picmp_hdr_echo->ChkSum, 0x0000); /* Clr chk sum (see Note #7b). */
msg_chk_sum = NetUtil_16BitOnesCplChkSumDataCalc((void *) pmsg_req,
(void *) 0,
(CPU_INT16U) 0,
(NET_ERR *)&err);
NET_UTIL_VAL_COPY_16(&picmp_hdr_echo->ChkSum, &msg_chk_sum); /* Copy chk sum in net order (see Note #7c).*/
break;
case NET_ICMP_MSG_TYPE_TS_REQ:
picmp_hdr_ts = (NET_ICMP_HDR_TS *)&pmsg_req->Data[pmsg_req_hdr->ICMP_MsgIx];
picmp_hdr_ts->Type = NET_ICMP_MSG_TYPE_TS_REQ;
picmp_hdr_ts->Code = NET_ICMP_MSG_CODE_TS_REQ;
ts = NetUtil_TS_Get(); /* See Note #1cB1. */
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_ts->ID, &id);
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_ts->SeqNbr, &msg_seq_nbr);
NET_UTIL_VAL_COPY_SET_NET_32(&picmp_hdr_ts->TS_Originate, &ts);
NET_UTIL_VAL_SET_NET_32(&picmp_hdr_ts->TS_Rx, NET_TS_NONE);
NET_UTIL_VAL_SET_NET_32(&picmp_hdr_ts->TS_Tx, NET_TS_NONE);
/* Calc ICMP msg chk sum (see Note #7). */
NET_UTIL_VAL_SET_NET_16(&picmp_hdr_ts->ChkSum, 0x0000); /* Clr chk sum (see Note #7b). */
msg_chk_sum = NetUtil_16BitOnesCplChkSumHdrCalc((void *) picmp_hdr_ts,
(CPU_INT16U) pmsg_req_hdr->ICMP_MsgLen,
(NET_ERR *)&err);
NET_UTIL_VAL_COPY_16(&picmp_hdr_ts->ChkSum, &msg_chk_sum); /* Copy chk sum in net order (see Note #7c).*/
break;
case NET_ICMP_MSG_TYPE_ADDR_MASK_REQ:
picmp_hdr_addr = (NET_ICMP_HDR_ADDR_MASK *)&pmsg_req->Data[pmsg_req_hdr->ICMP_MsgIx];
picmp_hdr_addr->Type = NET_ICMP_MSG_TYPE_ADDR_MASK_REQ;
picmp_hdr_addr->Code = NET_ICMP_MSG_CODE_ADDR_MASK_REQ;
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_addr->ID, &id);
NET_UTIL_VAL_COPY_SET_NET_16(&picmp_hdr_addr->SeqNbr, &msg_seq_nbr);
NET_UTIL_VAL_SET_NET_32(&picmp_hdr_addr->AddrMask, NET_IP_ADDR_NONE);
/* Calc ICMP msg chk sum (see Note #7). */
NET_UTIL_VAL_SET_NET_16(&picmp_hdr_addr->ChkSum, 0x0000); /* Clr chk sum (see Note #7b). */
msg_chk_sum = NetUtil_16BitOnesCplChkSumHdrCalc((void *) picmp_hdr_addr,
(CPU_INT16U) pmsg_req_hdr->ICMP_MsgLen,
(NET_ERR *)&err);
NET_UTIL_VAL_COPY_16(&picmp_hdr_addr->ChkSum, &msg_chk_sum); /* Copy chk sum in net order (see Note #7c).*/
break;
default: /* See Note #4. */
NetICMP_TxPktDiscard(pmsg_req, perr);
return (id_seq); /* Prevent 'break NOT reachable' compiler warning. */
}
if (err != NET_UTIL_ERR_NONE) { /* Chk err from NetUtil_16BitOnesCplChkSum()'s. */
NetICMP_TxPktDiscard(pmsg_req, perr);
return (id_seq);
}
/*$PAGE*/
/* ----------------- TX ICMP REQ MSG ------------------ */
NetIP_Tx((NET_BUF *)pmsg_req,
(NET_IP_ADDR)NetIP_AddrThisHost,
(NET_IP_ADDR)addr_dest,
(NET_IP_TOS )TOS,
(NET_IP_TTL )TTL,
(CPU_INT16U )flags,
(void *)popts,
(NET_ERR *)perr);
/* ------- FREE ICMP REQ MSG / UPDATE TX STATS -------- */
switch (*perr) {
case NET_IP_ERR_NONE:
NetICMP_TxPktFree(pmsg_req);
NET_CTR_STAT_INC(NetICMP_StatTxMsgCtr);
NET_CTR_STAT_INC(NetICMP_StatTxMsgReqCtr);
break;
case NET_ERR_INIT_INCOMPLETE:
case NET_ERR_TX:
NET_CTR_ERR_INC(NetICMP_ErrTxPktDiscardedCtr); /* See Note #8. */
return (id_seq); /* Prevent 'break NOT reachable' compiler warning. */
default:
NetICMP_TxPktDiscard(pmsg_req, perr);
return (id_seq); /* Prevent 'break NOT reachable' compiler warning. */
}
*perr = NET_ICMP_ERR_NONE;
/* ----------- RTN ICMP REQ MSG ID/SEQ NBR ------------ */
id_seq.ID = id;
id_seq.SeqNbr = msg_seq_nbr;
return (id_seq);
}
/*$PAGE*/
/*
*********************************************************************************************************
* NetICMP_HandlerRx()
*
* Description : Handle & reply to incoming IP packets for ICMP error &/or status conditions.
*
* (1) (a) When network low-resources status is set, transmit ICMP Source Quench Error Messages.
*
* (b) When network low-resources status clears, clear the ICMP Transmit Source Quench List.
*
*
* Argument(s) : pbuf Pointer to network buffer that received an IP packet.
* ---- Argument validated in NetIP_RxPktValidate()
* by NetIP_Rx().
*
* Return(s) : none.
*
* Caller(s) : NetIP_RxPktValidate().
*
* This function is an INTERNAL network protocol suite function & MUST NOT be called by
* application function(s).
*
* Note(s) : none.
*********************************************************************************************************
*/
void NetICMP_HandlerRx (NET_BUF *pbuf)
{
#if (NET_ICMP_CFG_TX_SRC_QUENCH_EN == DEF_ENABLED)
NET_DBG_STATUS rsrc_lo;
rsrc_lo = NetDbg_MonTaskStatGetHandlerLo(); /* Get lo rsrc's status. */
if (rsrc_lo != NET_DBG_STATUS_OK) { /* If net rsrc's lo, ... */
NetICMP_HandlerTxSrcQuench(pbuf); /* ... tx ICMP src quench err to IP pkt src host. */
} else { /* Else if ICMP tx src quench list avail, ... */
if (NetICMP_TxSrcQuenchListHead != (NET_ICMP_TX_SRC_QUENCH *)0) {
NetICMP_HandlerTxSrcQuenchClrList(); /* ... clr tx src quench list. */
}
}
#else
(void)&pbuf; /* Prevent compiler warning. */
#endif
}
/*$PAGE*/
/*
*********************************************************************************************************
*********************************************************************************************************
* LOCAL FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* NetICMP_RxPktValidateBuf()
*
* Description : Validate received buffer header as ICMP protocol.
*
* Argument(s) : pbuf_hdr Pointer to network buffer header that received ICMP packet.
* -------- Argument validated in NetICMP_Rx().
*
* perr Pointer to variable that will receive the return error code from this function :
*
* NET_ICMP_ERR_NONE Received buffer's ICMP header validated.
* NET_ERR_INVALID_PROTOCOL Buffer's protocol type is NOT ICMP.
* NET_BUF_ERR_INVALID_IX Invalid buffer index.
*
* Return(s) : none.
*
* Caller(s) : NetICMP_Rx().
*
* Note(s) : none.
*********************************************************************************************************
*/
#if (NET_ERR_CFG_ARG_CHK_DBG_EN == DEF_ENABLED)
static void NetICMP_RxPktValidateBuf (NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr)
{
#if ((NET_CTR_CFG_ERR_EN == DEF_ENABLED) && \
(CPU_CFG_CRITICAL_METHOD == CPU_CRITICAL_METHOD_STATUS_LOCAL))
CPU_SR cpu_sr;
#endif
/* --------------- VALIDATE ICMP BUF HDR -------------- */
if (pbuf_hdr->ProtocolHdrType != NET_PROTOCOL_TYPE_ICMP) {
NET_CTR_ERR_INC(Net_ErrInvalidProtocolCtr);
*perr = NET_ERR_INVALID_PROTOCOL;
return;
}
if (pbuf_hdr->ICMP_MsgIx == NET_BUF_IX_NONE) {
NET_CTR_ERR_INC(NetICMP_ErrRxInvalidBufIxCtr);
*perr = NET_BUF_ERR_INVALID_IX;
return;
}
*perr = NET_ICMP_ERR_NONE;
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* NetICMP_RxPktValidate()
*
* Description : (1) Validate received ICMP packet :
*
* (a) Validate the received packet's destination (see Note #3).
*
* (b) (1) Validate the received packet's following ICMP message fields :
*
* (A) Type
* (B) Code
* (C) Message Length
* (D) Pointer See RFC #792, Section 'Parameter Problem Message'
* (E) Check-Sum See Note #7a
*
* (2) Validation ignores the following ICMP header fields :
*
* (A) Unused See RFC # 792, Section 'Message Formats'
* (B) Data See RFC #1122, Sections 3.2.2 & 3.2.2.6
* (C) Identification (ID) See RFC # 792, Sections 'Echo or Echo Reply Message'
* & 'Timestamp or Timestamp Reply Message'
* (D) Sequence Number See RFC # 792, Sections 'Echo or Echo Reply Message'
* & 'Timestamp or Timestamp Reply Message'
*
* (c) Convert the following ICMP message fields from network-order to host-order :
*
* (1) Check-Sum See Note #7c
*
* (A) These fields are NOT converted directly in the received packet buffer's
* data area but are converted in local or network buffer variables ONLY.
*
* (d) Update network buffer's length controls.
*
* (e) Demultiplex ICMP message type.
*
*
* Argument(s) : pbu?? 快捷鍵說明
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