📄 net_ip.c
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/*
*********************************************************************************************************
* uC/TCP-IP
* The Embedded TCP/IP Suite
*
* (c) Copyright 2003-2006; Micrium, Inc.; Weston, FL
*
* All rights reserved. Protected by international copyright laws.
*
* uC/TCP-IP is provided in source form for FREE evaluation, for educational
* use or peaceful research. If you plan on using uC/TCP-IP in a commercial
* product you need to contact Micrium to properly license its use in your
* product. We provide ALL the source code for your convenience and to help
* you experience uC/TCP-IP. The fact that the source code is provided does
* NOT mean that you can use it without paying a licensing fee.
*
* Knowledge of the source code may NOT be used to develop a similar product.
*
* Please help us continue to provide the Embedded community with the finest
* software available. Your honesty is greatly appreciated.
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*
* NETWORK IP LAYER
* (INTERNET PROTOCOL)
*
* Filename : net_ip.c
* Version : V1.87
* Programmer(s) : ITJ
*********************************************************************************************************
* Note(s) : (1) Supports Internet Protocol as described in RFC #791, also known as IPv4, with the
* following restrictions/constraints :
*
* (a) ONLY supports a single network interface/ RFC # 791, Section 2.3
* host IP address 'Addressing'
*
* (b) ONLY supports a single default gateway RFC #1122, Section 3.3.1
*
* (c) IP forwarding/routing NOT supported RFC #1122, Sections 3.3.1,
* 3.3.4 & 3.3.5
*
* (d) IP multicasting NOT supported RFC #1122, Section 3.3.7
*
* (e) Transmit fragmentation NOT currently supported RFC # 791, Section 2.3
* 'Fragmentation &
* Reassembly'
* (f) IP Security options NOT currently supported RFC #1108
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#define NET_IP_MODULE
#include <net.h>
/*$PAGE*/
/*
*********************************************************************************************************
* LOCAL DEFINES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL CONSTANTS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL DATA TYPES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL TABLES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/
/*$PAGE*/
/*
*********************************************************************************************************
* LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/
/* -------- VALIDATE RX DATAGRAMS --------- */
#if (NET_ERR_CFG_ARG_CHK_DBG_EN == DEF_ENABLED)
static void NetIP_RxPktValidateBuf (NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
#endif
static void NetIP_RxPktValidate (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_IP_HDR *pip_hdr,
NET_ERR *perr);
static void NetIP_RxPktValidateOpt (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_IP_HDR *pip_hdr,
CPU_INT08U ip_hdr_len_size,
NET_ERR *perr);
static CPU_BOOLEAN NetIP_RxPktValidateOptRoute (CPU_INT08U *popts,
CPU_INT08U opt_list_len_rem,
CPU_INT08U *popt_len,
NET_ERR *perr);
static CPU_BOOLEAN NetIP_RxPktValidateOptTS (CPU_INT08U *popts,
CPU_INT08U opt_list_len_rem,
CPU_INT08U *popt_len,
NET_ERR *perr);
/* ------------ REASM RX FRAGS ------------ */
static NET_BUF *NetIP_RxPktFragReasm (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_IP_HDR *pip_hdr,
NET_ERR *perr);
static NET_BUF *NetIP_RxPktFragListAdd (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
CPU_INT16U frag_ip_flags,
CPU_INT16U frag_offset,
CPU_INT16U frag_size,
NET_ERR *perr);
static NET_BUF *NetIP_RxPktFragListInsert (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
CPU_INT16U frag_ip_flags,
CPU_INT16U frag_offset,
CPU_INT16U frag_size,
NET_BUF *pfrag_list,
NET_ERR *perr);
static void NetIP_RxPktFragListRemove (NET_BUF *pfrag_list,
CPU_BOOLEAN tmr_free);
static void NetIP_RxPktFragListDiscard (NET_BUF *pfrag_list,
CPU_BOOLEAN tmr_free,
NET_ERR *perr);
static void NetIP_RxPktFragListUpdate (NET_BUF_HDR *pfrag_list_buf_hdr,
CPU_INT16U frag_ip_flags,
CPU_INT16U frag_offset,
CPU_INT16U frag_size);
static NET_BUF *NetIP_RxPktFragListChkComplete(NET_BUF *pfrag_list,
NET_BUF_HDR *pfrag_list_buf_hdr,
NET_ERR *perr);
static void NetIP_RxPktFragTimeout (void *pfrag_list_timeout);
/* ---------- DEMUX RX DATAGRAMS ---------- */
static void NetIP_RxPktDemuxDatagram (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
static void NetIP_RxPktDiscard (NET_BUF *pbuf,
NET_ERR *perr);
/*$PAGE*/
/* ----------- VALIDATE TX PKTS ----------- */
#if (NET_ERR_CFG_ARG_CHK_DBG_EN == DEF_ENABLED)
static void NetIP_TxPktValidate (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_IP_ADDR addr_src,
NET_IP_ADDR addr_dest,
NET_IP_TOS TOS,
NET_IP_TTL TTL,
CPU_INT16U flags,
void *popts,
NET_ERR *perr);
static void NetIP_TxPktValidateOpt (void *popts,
NET_ERR *perr);
static void NetIP_TxPktValidateOptRouteTS (void *popt_route_ts,
CPU_INT08U *popt_len,
void **popt_next,
NET_ERR *perr);
#endif
/* -------------- TX IP PKTS -------------- */
static void NetIP_TxPkt (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_IP_ADDR addr_src,
NET_IP_ADDR addr_dest,
NET_IP_TOS TOS,
NET_IP_TTL TTL,
CPU_INT16U flags,
void *popts,
NET_ERR *perr);
static CPU_INT08U NetIP_TxPktPrepareOpt (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
void *popts,
CPU_INT08U *popt_hdr,
NET_ERR *perr);
static void NetIP_TxPktPrepareOptRoute (void *popts,
CPU_INT08U *popt_hdr,
CPU_INT08U *popt_len,
void **popt_next,
NET_ERR *perr);
static void NetIP_TxPktPrepareOptTS (void *popts,
CPU_INT08U *popt_hdr,
CPU_INT08U *popt_len,
void **popt_next,
NET_ERR *perr);
static void NetIP_TxPktPrepareOptTSRoute (void *popts,
CPU_INT08U *popt_hdr,
CPU_INT08U *popt_len,
void **popt_next,
NET_ERR *perr);
static void NetIP_TxPktPrepareHdr (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
CPU_INT16U ip_hdr_len_tot,
CPU_INT08U ip_opt_len_tot,
CPU_INT16U protocol_ix,
NET_IP_ADDR addr_src,
NET_IP_ADDR addr_dest,
NET_IP_TOS TOS,
NET_IP_TTL TTL,
CPU_INT16U flags,
CPU_INT32U *pip_hdr_opts,
NET_ERR *perr);
/* ------------ TX IP DATAGRAMS ----------- */
static void NetIP_TxPktDatagram (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
static void NetIP_TxPktDatagramNextHopSel (NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
static void NetIP_TxPktDiscard (NET_BUF *pbuf,
NET_ERR *perr);
/*$PAGE*/
/* ------------ RE-TX IP PKTS ------------- */
static void NetIP_ReTxPkt (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
static void NetIP_ReTxPktPrepareHdr (NET_BUF *pbuf,
NET_BUF_HDR *pbuf_hdr,
NET_ERR *perr);
/*
*********************************************************************************************************
* LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/
/*$PAGE*/
/*
*********************************************************************************************************
* NetIP_Init()
*
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