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Fix #116, separate logical vs. network PDU buffers
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Improves the distinction between PDU data being actively interpreted
or created during the PDU receive or transmit process, and the encoded
form of that data.

CF formerly treated the two as the same, directly referencing the
encoded form of the data.  This creates many repeated translations.
Furthermore, it would sometimes write a modified value back to the
packet in a partially-decoded form, so it was never clear what
was in a given buffer at a given time (it could be native byte
order or network byte order, in the same fields).

This introduces a "logical" buffer which correlates to the CFDP
buffer, but is used for all in-work or temporary value storage.
All values in the logical buffer are normalized to the native
machine, that is they are aligned properly and always in the
correct byte order for the host, so they can be used as normal
values without any need for translation.

When it comes time to transmit data to/from the network, a
dedicated Encode/Decode function is used, to translate the
entire content from its native form to the network form, or
vice versa.

FSW should typically not access the encoded form of data,
outside of the codec routines, except under very limited
circumstances with good reason (such as dynamically updating
the total_length field in the base header after encode).
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@jphickey
jphickey committed Dec 17, 2021
1 parent 5bf6e5a commit c074b39
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Showing 12 changed files with 2,077 additions and 774 deletions.
5 changes: 4 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ set(APP_SRC_FILES
fsw/src/cf_cfdp_s.c
fsw/src/cf_chunk.c
fsw/src/cf_clist.c
fsw/src/cf_codec.c
fsw/src/cf_cmd.c
fsw/src/cf_crc.c
fsw/src/cf_timer.c
Expand All @@ -31,5 +32,7 @@ add_definitions("-D_DEFAULT_SOURCE")
add_definitions(-D_DEFAULT_SOURCE=1)
add_definitions(-D_EL -DENDIAN=_EL -DSOFTWARE_BIG_BIT_ORDER)
if (ENABLE_UNIT_TESTS)
add_subdirectory(unit-test)
# JPHFIX - unit tests are broken in this version right now.
# This needs to be fixed before merge.
#add_subdirectory(unit-test)
endif (ENABLE_UNIT_TESTS)
699 changes: 399 additions & 300 deletions fsw/src/cf_cfdp.c
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59 changes: 32 additions & 27 deletions fsw/src/cf_cfdp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,10 +29,12 @@

#include "cfe.h"
#include "cf_cfdp_pdu.h"
#include "cf_logical_pdu.h"
#include "cf_crc.h"
#include "cf_timer.h"
#include "cf_clist.h"
#include "cf_chunk.h"
#include "cf_codec.h"

#define CF_NUM_TRANSACTIONS_PER_CHANNEL \
(CF_MAX_COMMANDED_PLAYBACK_FILES_PER_CHAN + CF_MAX_SIMULTANEOUS_RX + \
Expand Down Expand Up @@ -295,16 +297,20 @@ typedef struct CF_Channel

typedef struct CF_Output
{
CFE_SB_Buffer_t *msg;
CFE_SB_Buffer_t *msg;
CF_EncoderState_t encode;

/* Temporary R/W buffer for holding output PDUs while working with them */
CF_Logical_PduBuffer_t tx_pdudata;
} CF_Output_t;

typedef struct CF_Input
{
CFE_SB_Buffer_t *msg;
CFE_MSG_Size_t bytes_received;
CF_EntityId_t src;
CF_EntityId_t dst;
CF_TransactionSeq_t tsn;
CFE_SB_Buffer_t *msg;
CF_DecoderState_t decode;

/* Temporary R/W buffer for holding input PDUs while working with them */
CF_Logical_PduBuffer_t rx_pdudata;
} CF_Input_t;

/* An engine represents a pairing to a local EID
Expand Down Expand Up @@ -350,7 +356,7 @@ typedef void (*CF_CFDP_StateSendFunc_t)(CF_Transaction_t *t);
* @param[inout] t The transaction object
* @param[inout] ph The PDU buffer currently being received/processed
*/
typedef void (*CF_CFDP_StateRecvFunc_t)(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
typedef void (*CF_CFDP_StateRecvFunc_t)(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);

/**
* @brief A table of receive handler functions based on file directive code
Expand Down Expand Up @@ -411,12 +417,12 @@ extern int32 CF_CFDP_PlaybackDir(const char src_filename[CF_FILENAME_MAX_LEN],

/* PDU send functions */
/* CF_CFDP_ConstructPduHeader sets length of 0. Must set it after building packet */
extern CF_CFDP_PduHeader_t *CF_CFDP_ConstructPduHeader(const CF_Transaction_t *t, uint8 directive_code,
CF_EntityId_t src_eid, CF_EntityId_t dst_eid,
uint8 towards_sender, CF_TransactionSeq_t tsn, int silent);
extern CF_SendRet_t CF_CFDP_SendMd(CF_Transaction_t *t);
extern CF_SendRet_t CF_CFDP_SendFd(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph, uint32 offset, int len);
extern CF_SendRet_t CF_CFDP_SendEof(CF_Transaction_t *t);
CF_Logical_PduBuffer_t *CF_CFDP_ConstructPduHeader(const CF_Transaction_t *t, CF_CFDP_FileDirective_t directive_code,
CF_EntityId_t src_eid, CF_EntityId_t dst_eid, bool towards_sender,
CF_TransactionSeq_t tsn, bool silent);
extern CF_SendRet_t CF_CFDP_SendMd(CF_Transaction_t *t);
extern CF_SendRet_t CF_CFDP_SendFd(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern CF_SendRet_t CF_CFDP_SendEof(CF_Transaction_t *t);
/* NOTE: CF_CFDP_SendAck() takes a CF_TransactionSeq_t instead of getting it from transaction history because
* of the special case where a FIN-ACK must be sent for an unknown transaction. It's better for
* long term maintenance to not build an incomplete CF_History_t for it.
Expand All @@ -425,22 +431,22 @@ extern CF_SendRet_t CF_CFDP_SendAck(CF_Transaction_t *t, CF_CFDP_AckTxnStatus_t
CF_CFDP_ConditionCode_t cc, CF_EntityId_t peer_eid, CF_TransactionSeq_t tsn);
extern CF_SendRet_t CF_CFDP_SendFin(CF_Transaction_t *t, CF_CFDP_FinDeliveryCode_t dc, CF_CFDP_FinFileStatus_t fs,
CF_CFDP_ConditionCode_t cc);
extern CF_SendRet_t CF_CFDP_SendNak(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph, int num_segment_requests);
extern CF_SendRet_t CF_CFDP_SendNak(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);

/* PDU receive functions */
/* returns 0 on success */
extern int CF_CFDP_RecvMd(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern int CF_CFDP_RecvFd(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern int CF_CFDP_RecvEof(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern int CF_CFDP_RecvAck(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern int CF_CFDP_RecvFin(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern int CF_CFDP_RecvNak(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph, int *num_segment_requests);
extern int CF_CFDP_RecvMd(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern int CF_CFDP_RecvFd(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern int CF_CFDP_RecvEof(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern int CF_CFDP_RecvAck(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern int CF_CFDP_RecvFin(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern int CF_CFDP_RecvNak(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);

/* Engine functional dispatch. These are all implemented in cf_cfdp_r.c or cf_cfdp_s.c */
extern void CF_CFDP_S1_Recv(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern void CF_CFDP_R1_Recv(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern void CF_CFDP_S2_Recv(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern void CF_CFDP_R2_Recv(CF_Transaction_t *t, CF_CFDP_PduHeader_t *ph);
extern void CF_CFDP_S1_Recv(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern void CF_CFDP_R1_Recv(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern void CF_CFDP_S2_Recv(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern void CF_CFDP_R2_Recv(CF_Transaction_t *t, CF_Logical_PduBuffer_t *ph);
extern void CF_CFDP_S1_Tx(CF_Transaction_t *t);
extern void CF_CFDP_S2_Tx(CF_Transaction_t *t);
extern void CF_CFDP_R_Tick(CF_Transaction_t *t, int *cont);
Expand All @@ -452,12 +458,11 @@ extern void CF_CFDP_R_Init(CF_Transaction_t *t);

extern void CF_CFDP_CancelTransaction(CF_Transaction_t *t);

extern CF_CFDP_PduHeader_t *CF_CFDP_MsgOutGet(const CF_Transaction_t *t, int silent);
extern CF_Logical_PduBuffer_t *CF_CFDP_MsgOutGet(const CF_Transaction_t *t, bool silent);

/* functions to handle LVs (length-value, cfdp spec) */
/* returns number of bytes copied, or -1 on error */
extern int CF_CFDP_CopyDataToLv(CF_CFDP_lv_t *dest_lv, const uint8 *data, uint32 len);
extern int CF_CFDP_CopyDataFromLv(uint8 buf[CF_FILENAME_MAX_LEN], const CF_CFDP_lv_t *dest_lv);
extern int CF_CFDP_CopyStringFromLV(char *buf, size_t buf_maxsz, const CF_Logical_Lv_t *src_lv);

extern const int CF_max_chunks[CF_Direction_NUM][CF_NUM_CHANNELS];

Expand Down
151 changes: 7 additions & 144 deletions fsw/src/cf_cfdp_helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,153 +36,16 @@
#include <string.h>
#include "cf_assert.h"

int CF_GetMemcpySize(const uint8 *num, int size)
uint8 CF_GetNumberMinSize(uint64 Value)
{
int i;
uint8 MinSize;
uint64 Limit = 0x100;

#if ENDIAN == _EL
for (i = size - 1; i > 0; --i)
if (num[i])
break;
++i;
#elif ENDIAN == _EB
for (i = 0; i < (size - 1); ++i)
if (num[i])
break;
i = size - i;
#else
#error define ENDIAN
#endif

return i;
}

void CF_MemcpyToBE(uint8 *dst, const uint8 *src, int src_size, int dst_size)
{
CF_Assert((src_size > 0) && (dst_size > 0));
CF_Assert(src_size >= dst_size);

#if ENDIAN == _EL
dst += (dst_size - 1);
while (dst_size--)
*dst-- = *src++;
#elif ENDIAN == _EB
src += (src_size - dst_size);
while (dst_size--)
*dst++ = *src++;
#else
#error define ENDIAN
#endif
}

/* copies bytes in big-endian order from a byte source */
static void CF_MemcpyFromBE(uint8 *dst, const uint8 *src, int src_size, int dst_size)
{
CF_Assert((src_size > 0) && (dst_size > 0));
CF_Assert(dst_size >= src_size);

memset(dst, 0, dst_size);
#if ENDIAN == _EL
src += (src_size - 1);
while (src_size--)
*dst++ = *src--;
#elif ENDIAN == _EB
dst += (dst_size - src_size);
while (src_size--)
*dst++ = *src++;
#else
#error define ENDIAN
#endif
}

static int CF_GetTSNSize(const CF_CFDP_PduHeader_t *ph)
{
uint8 field;
int ret;

cfdp_get_uint8(field, ph->eid_tsn_lengths);
ret = FGV(field, CF_CFDP_PduHeader_LENGTHS_TRANSACTION_SEQUENCE) + 1;

if (ret > sizeof(CF_TransactionSeq_t))
Limit = 0x100;
for (MinSize = 1; MinSize < 8 && Value >= Limit; ++MinSize)
{
CFE_EVS_SendEvent(CF_EID_ERR_PDU_GET_TSN_SIZE, CFE_EVS_EventType_ERROR,
"received TSN size %d too large for compiled max of %d", ret,
(uint32)sizeof(CF_TransactionSeq_t));
return -1;
Limit <<= 8;
}

return ret;
}

static int CF_GetEIDSize(const CF_CFDP_PduHeader_t *ph)
{
uint8 field;
int ret;

cfdp_get_uint8(field, ph->eid_tsn_lengths);
ret = FGV(field, CF_CFDP_PduHeader_LENGTHS_ENTITY) + 1;

if (ret > sizeof(CF_EntityId_t))
{
CFE_EVS_SendEvent(CF_EID_ERR_PDU_GET_EID_SIZE, CFE_EVS_EventType_ERROR,
"received EID size %d too large for compiled max of %d", ret, (uint32)sizeof(CF_EntityId_t));
return -1;
}

return ret;
}

/* get the variable length header items out of the PDU header and store as incoming data */
/* in.msg must be valid PDU message */
int CF_GetVariableHeader(CF_CFDP_PduHeader_t *ph)
{
const int eid_l = CF_GetEIDSize(ph);
const int tsn_l = CF_GetTSNSize(ph);
int offs = sizeof(*ph);
int ret = -1;

if ((eid_l > 0) && (tsn_l > 0))
{
CF_MemcpyFromBE((uint8 *)&CF_AppData.engine.in.src, ((uint8 *)ph) + offs, eid_l, sizeof(CF_EntityId_t));
offs += eid_l;
CF_MemcpyFromBE((uint8 *)&CF_AppData.engine.in.tsn, ((uint8 *)ph) + offs, tsn_l, sizeof(CF_TransactionSeq_t));
offs += tsn_l;
CF_MemcpyFromBE((uint8 *)&CF_AppData.engine.in.dst, ((uint8 *)ph) + offs, eid_l, sizeof(CF_EntityId_t));
ret = 0;
}

return ret;
}

void CF_SetVariableHeader(CF_CFDP_PduHeader_t *ph, CF_EntityId_t src_eid, CF_EntityId_t dst_eid,
CF_TransactionSeq_t tsn)
{
int offs = sizeof(*ph);
const int eid_s_l = CF_GetMemcpySize((uint8 *)&src_eid, sizeof(src_eid));
const int eid_d_l = CF_GetMemcpySize((uint8 *)&dst_eid, sizeof(dst_eid));
const int tsn_l = CF_GetMemcpySize((uint8 *)&tsn, sizeof(tsn));
const int csize = ((eid_s_l > eid_d_l) ? eid_s_l : eid_d_l);

CF_MemcpyToBE(((uint8 *)ph) + offs, (uint8 *)&src_eid, sizeof(src_eid), csize);
offs += csize;
CF_MemcpyToBE(((uint8 *)ph) + offs, (uint8 *)&tsn, sizeof(tsn), tsn_l);
offs += tsn_l;
CF_MemcpyToBE(((uint8 *)ph) + offs, (uint8 *)&dst_eid, sizeof(dst_eid), csize);

FSV(ph->eid_tsn_lengths, CF_CFDP_PduHeader_LENGTHS_ENTITY, csize - 1);
FSV(ph->eid_tsn_lengths, CF_CFDP_PduHeader_LENGTHS_TRANSACTION_SEQUENCE, tsn_l - 1);
}

int CF_HeaderSize(const CF_CFDP_PduHeader_t *ph)
{
uint8 temp;

/* NOTE: assume header size is correct here (packet already validated via CF_GetVariableHeader, or
* set by CF for outgoing PDU */
cfdp_ldst_uint8(temp, ph->eid_tsn_lengths);
const int eid_l = 1 + FGV(temp, CF_CFDP_PduHeader_LENGTHS_ENTITY);
const int tsn_l = 1 + FGV(temp, CF_CFDP_PduHeader_LENGTHS_TRANSACTION_SEQUENCE);

CF_Assert((eid_l > 0) && (tsn_l > 0));
return sizeof(CF_CFDP_PduHeader_t) + (2 * eid_l) + tsn_l;
return MinSize;
}
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