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Diffstat (limited to 'drivers/net/sk98lin/skcsum.c')
| -rw-r--r-- | drivers/net/sk98lin/skcsum.c | 871 |
1 files changed, 0 insertions, 871 deletions
diff --git a/drivers/net/sk98lin/skcsum.c b/drivers/net/sk98lin/skcsum.c deleted file mode 100644 index 38a6e7a631f..00000000000 --- a/drivers/net/sk98lin/skcsum.c +++ /dev/null @@ -1,871 +0,0 @@ -/****************************************************************************** - * - * Name: skcsum.c - * Project: GEnesis, PCI Gigabit Ethernet Adapter - * Version: $Revision: 1.12 $ - * Date: $Date: 2003/08/20 13:55:53 $ - * Purpose: Store/verify Internet checksum in send/receive packets. - * - ******************************************************************************/ - -/****************************************************************************** - * - * (C)Copyright 1998-2003 SysKonnect GmbH. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * The information in this file is provided "AS IS" without warranty. - * - ******************************************************************************/ - -#ifdef SK_USE_CSUM /* Check if CSUM is to be used. */ - -#ifndef lint -static const char SysKonnectFileId[] = - "@(#) $Id: skcsum.c,v 1.12 2003/08/20 13:55:53 mschmid Exp $ (C) SysKonnect."; -#endif /* !lint */ - -/****************************************************************************** - * - * Description: - * - * This is the "GEnesis" common module "CSUM". - * - * This module contains the code necessary to calculate, store, and verify the - * Internet Checksum of IP, TCP, and UDP frames. - * - * "GEnesis" is an abbreviation of "Gigabit Ethernet Network System in Silicon" - * and is the code name of this SysKonnect project. - * - * Compilation Options: - * - * SK_USE_CSUM - Define if CSUM is to be used. Otherwise, CSUM will be an - * empty module. - * - * SKCS_OVERWRITE_PROTO - Define to overwrite the default protocol id - * definitions. In this case, all SKCS_PROTO_xxx definitions must be made - * external. - * - * SKCS_OVERWRITE_STATUS - Define to overwrite the default return status - * definitions. In this case, all SKCS_STATUS_xxx definitions must be made - * external. - * - * Include File Hierarchy: - * - * "h/skdrv1st.h" - * "h/skcsum.h" - * "h/sktypes.h" - * "h/skqueue.h" - * "h/skdrv2nd.h" - * - ******************************************************************************/ - -#include "h/skdrv1st.h" -#include "h/skcsum.h" -#include "h/skdrv2nd.h" - -/* defines ********************************************************************/ - -/* The size of an Ethernet MAC header. */ -#define SKCS_ETHERNET_MAC_HEADER_SIZE (6+6+2) - -/* The size of the used topology's MAC header. */ -#define SKCS_MAC_HEADER_SIZE SKCS_ETHERNET_MAC_HEADER_SIZE - -/* The size of the IP header without any option fields. */ -#define SKCS_IP_HEADER_SIZE 20 - -/* - * Field offsets within the IP header. - */ - -/* "Internet Header Version" and "Length". */ -#define SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH 0 - -/* "Total Length". */ -#define SKCS_OFS_IP_TOTAL_LENGTH 2 - -/* "Flags" "Fragment Offset". */ -#define SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET 6 - -/* "Next Level Protocol" identifier. */ -#define SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL 9 - -/* Source IP address. */ -#define SKCS_OFS_IP_SOURCE_ADDRESS 12 - -/* Destination IP address. */ -#define SKCS_OFS_IP_DESTINATION_ADDRESS 16 - - -/* - * Field offsets within the UDP header. - */ - -/* UDP checksum. */ -#define SKCS_OFS_UDP_CHECKSUM 6 - -/* IP "Next Level Protocol" identifiers (see RFC 790). */ -#define SKCS_PROTO_ID_TCP 6 /* Transport Control Protocol */ -#define SKCS_PROTO_ID_UDP 17 /* User Datagram Protocol */ - -/* IP "Don't Fragment" bit. */ -#define SKCS_IP_DONT_FRAGMENT SKCS_HTON16(0x4000) - -/* Add a byte offset to a pointer. */ -#define SKCS_IDX(pPtr, Ofs) ((void *) ((char *) (pPtr) + (Ofs))) - -/* - * Macros that convert host to network representation and vice versa, i.e. - * little/big endian conversion on little endian machines only. - */ -#ifdef SK_LITTLE_ENDIAN -#define SKCS_HTON16(Val16) (((unsigned) (Val16) >> 8) | (((Val16) & 0xff) << 8)) -#endif /* SK_LITTLE_ENDIAN */ -#ifdef SK_BIG_ENDIAN -#define SKCS_HTON16(Val16) (Val16) -#endif /* SK_BIG_ENDIAN */ -#define SKCS_NTOH16(Val16) SKCS_HTON16(Val16) - -/* typedefs *******************************************************************/ - -/* function prototypes ********************************************************/ - -/****************************************************************************** - * - * SkCsGetSendInfo - get checksum information for a send packet - * - * Description: - * Get all checksum information necessary to send a TCP or UDP packet. The - * function checks the IP header passed to it. If the high-level protocol - * is either TCP or UDP the pseudo header checksum is calculated and - * returned. - * - * The function returns the total length of the IP header (including any - * IP option fields), which is the same as the start offset of the IP data - * which in turn is the start offset of the TCP or UDP header. - * - * The function also returns the TCP or UDP pseudo header checksum, which - * should be used as the start value for the hardware checksum calculation. - * (Note that any actual pseudo header checksum can never calculate to - * zero.) - * - * Note: - * There is a bug in the GENESIS ASIC which may lead to wrong checksums. - * - * Arguments: - * pAc - A pointer to the adapter context struct. - * - * pIpHeader - Pointer to IP header. Must be at least the IP header *not* - * including any option fields, i.e. at least 20 bytes. - * - * Note: This pointer will be used to address 8-, 16-, and 32-bit - * variables with the respective alignment offsets relative to the pointer. - * Thus, the pointer should point to a 32-bit aligned address. If the - * target system cannot address 32-bit variables on non 32-bit aligned - * addresses, then the pointer *must* point to a 32-bit aligned address. - * - * pPacketInfo - A pointer to the packet information structure for this - * packet. Before calling this SkCsGetSendInfo(), the following field must - * be initialized: - * - * ProtocolFlags - Initialize with any combination of - * SKCS_PROTO_XXX bit flags. SkCsGetSendInfo() will only work on - * the protocols specified here. Any protocol(s) not specified - * here will be ignored. - * - * Note: Only one checksum can be calculated in hardware. Thus, if - * SKCS_PROTO_IP is specified in the 'ProtocolFlags', - * SkCsGetSendInfo() must calculate the IP header checksum in - * software. It might be a better idea to have the calling - * protocol stack calculate the IP header checksum. - * - * Returns: N/A - * On return, the following fields in 'pPacketInfo' may or may not have - * been filled with information, depending on the protocol(s) found in the - * packet: - * - * ProtocolFlags - Returns the SKCS_PROTO_XXX bit flags of the protocol(s) - * that were both requested by the caller and actually found in the packet. - * Protocol(s) not specified by the caller and/or not found in the packet - * will have their respective SKCS_PROTO_XXX bit flags reset. - * - * Note: For IP fragments, TCP and UDP packet information is ignored. - * - * IpHeaderLength - The total length in bytes of the complete IP header - * including any option fields is returned here. This is the start offset - * of the IP data, i.e. the TCP or UDP header if present. - * - * IpHeaderChecksum - If IP has been specified in the 'ProtocolFlags', the - * 16-bit Internet Checksum of the IP header is returned here. This value - * is to be stored into the packet's 'IP Header Checksum' field. - * - * PseudoHeaderChecksum - If this is a TCP or UDP packet and if TCP or UDP - * has been specified in the 'ProtocolFlags', the 16-bit Internet Checksum - * of the TCP or UDP pseudo header is returned here. - */ -void SkCsGetSendInfo( -SK_AC *pAc, /* Adapter context struct. */ -void *pIpHeader, /* IP header. */ -SKCS_PACKET_INFO *pPacketInfo, /* Packet information struct. */ -int NetNumber) /* Net number */ -{ - /* Internet Header Version found in IP header. */ - unsigned InternetHeaderVersion; - - /* Length of the IP header as found in IP header. */ - unsigned IpHeaderLength; - - /* Bit field specifiying the desired/found protocols. */ - unsigned ProtocolFlags; - - /* Next level protocol identifier found in IP header. */ - unsigned NextLevelProtocol; - - /* Length of IP data portion. */ - unsigned IpDataLength; - - /* TCP/UDP pseudo header checksum. */ - unsigned long PseudoHeaderChecksum; - - /* Pointer to next level protocol statistics structure. */ - SKCS_PROTO_STATS *NextLevelProtoStats; - - /* Temporary variable. */ - unsigned Tmp; - - Tmp = *(SK_U8 *) - SKCS_IDX(pIpHeader, SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH); - - /* Get the Internet Header Version (IHV). */ - /* Note: The IHV is stored in the upper four bits. */ - - InternetHeaderVersion = Tmp >> 4; - - /* Check the Internet Header Version. */ - /* Note: We currently only support IP version 4. */ - - if (InternetHeaderVersion != 4) { /* IPv4? */ - SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX, - ("Tx: Unknown Internet Header Version %u.\n", - InternetHeaderVersion)); - pPacketInfo->ProtocolFlags = 0; - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++; - return; - } - - /* Get the IP header length (IHL). */ - /* - * Note: The IHL is stored in the lower four bits as the number of - * 4-byte words. - */ - - IpHeaderLength = (Tmp & 0xf) * 4; - pPacketInfo->IpHeaderLength = IpHeaderLength; - - /* Check the IP header length. */ - - /* 04-Aug-1998 sw - Really check the IHL? Necessary? */ - - if (IpHeaderLength < 5*4) { - SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX, - ("Tx: Invalid IP Header Length %u.\n", IpHeaderLength)); - pPacketInfo->ProtocolFlags = 0; - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++; - return; - } - - /* This is an IPv4 frame with a header of valid length. */ - - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxOkCts++; - - /* Check if we should calculate the IP header checksum. */ - - ProtocolFlags = pPacketInfo->ProtocolFlags; - - if (ProtocolFlags & SKCS_PROTO_IP) { - pPacketInfo->IpHeaderChecksum = - SkCsCalculateChecksum(pIpHeader, IpHeaderLength); - } - - /* Get the next level protocol identifier. */ - - NextLevelProtocol = - *(SK_U8 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL); - - /* - * Check if this is a TCP or UDP frame and if we should calculate the - * TCP/UDP pseudo header checksum. - * - * Also clear all protocol bit flags of protocols not present in the - * frame. - */ - - if ((ProtocolFlags & SKCS_PROTO_TCP) != 0 && - NextLevelProtocol == SKCS_PROTO_ID_TCP) { - /* TCP/IP frame. */ - ProtocolFlags &= SKCS_PROTO_TCP | SKCS_PROTO_IP; - NextLevelProtoStats = - &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_TCP]; - } - else if ((ProtocolFlags & SKCS_PROTO_UDP) != 0 && - NextLevelProtocol == SKCS_PROTO_ID_UDP) { - /* UDP/IP frame. */ - ProtocolFlags &= SKCS_PROTO_UDP | SKCS_PROTO_IP; - NextLevelProtoStats = - &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_UDP]; - } - else { - /* - * Either not a TCP or UDP frame and/or TCP/UDP processing not - * specified. - */ - pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP; - return; - } - - /* Check if this is an IP fragment. */ - - /* - * Note: An IP fragment has a non-zero "Fragment Offset" field and/or - * the "More Fragments" bit set. Thus, if both the "Fragment Offset" - * and the "More Fragments" are zero, it is *not* a fragment. We can - * easily check both at the same time since they are in the same 16-bit - * word. - */ - - if ((*(SK_U16 *) - SKCS_IDX(pIpHeader, SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET) & - ~SKCS_IP_DONT_FRAGMENT) != 0) { - /* IP fragment; ignore all other protocols. */ - pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP; - NextLevelProtoStats->TxUnableCts++; - return; - } - - /* - * Calculate the TCP/UDP pseudo header checksum. - */ - - /* Get total length of IP header and data. */ - - IpDataLength = - *(SK_U16 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_TOTAL_LENGTH); - - /* Get length of IP data portion. */ - - IpDataLength = SKCS_NTOH16(IpDataLength) - IpHeaderLength; - - /* Calculate the sum of all pseudo header fields (16-bit). */ - - PseudoHeaderChecksum = - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_SOURCE_ADDRESS + 0) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_SOURCE_ADDRESS + 2) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_DESTINATION_ADDRESS + 0) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_DESTINATION_ADDRESS + 2) + - (unsigned long) SKCS_HTON16(NextLevelProtocol) + - (unsigned long) SKCS_HTON16(IpDataLength); - - /* Add-in any carries. */ - - SKCS_OC_ADD(PseudoHeaderChecksum, PseudoHeaderChecksum, 0); - - /* Add-in any new carry. */ - - SKCS_OC_ADD(pPacketInfo->PseudoHeaderChecksum, PseudoHeaderChecksum, 0); - - pPacketInfo->ProtocolFlags = ProtocolFlags; - NextLevelProtoStats->TxOkCts++; /* Success. */ -} /* SkCsGetSendInfo */ - - -/****************************************************************************** - * - * SkCsGetReceiveInfo - verify checksum information for a received packet - * - * Description: - * Verify a received frame's checksum. The function returns a status code - * reflecting the result of the verification. - * - * Note: - * Before calling this function you have to verify that the frame is - * not padded and Checksum1 and Checksum2 are bigger than 1. - * - * Arguments: - * pAc - Pointer to adapter context struct. - * - * pIpHeader - Pointer to IP header. Must be at least the length in bytes - * of the received IP header including any option fields. For UDP packets, - * 8 additional bytes are needed to access the UDP checksum. - * - * Note: The actual length of the IP header is stored in the lower four - * bits of the first octet of the IP header as the number of 4-byte words, - * so it must be multiplied by four to get the length in bytes. Thus, the - * maximum IP header length is 15 * 4 = 60 bytes. - * - * Checksum1 - The first 16-bit Internet Checksum calculated by the - * hardware starting at the offset returned by SkCsSetReceiveFlags(). - * - * Checksum2 - The second 16-bit Internet Checksum calculated by the - * hardware starting at the offset returned by SkCsSetReceiveFlags(). - * - * Returns: - * SKCS_STATUS_UNKNOWN_IP_VERSION - Not an IP v4 frame. - * SKCS_STATUS_IP_CSUM_ERROR - IP checksum error. - * SKCS_STATUS_IP_CSUM_ERROR_TCP - IP checksum error in TCP frame. - * SKCS_STATUS_IP_CSUM_ERROR_UDP - IP checksum error in UDP frame - * SKCS_STATUS_IP_FRAGMENT - IP fragment (IP checksum ok). - * SKCS_STATUS_IP_CSUM_OK - IP checksum ok (not a TCP or UDP frame). - * SKCS_STATUS_TCP_CSUM_ERROR - TCP checksum error (IP checksum ok). - * SKCS_STATUS_UDP_CSUM_ERROR - UDP checksum error (IP checksum ok). - * SKCS_STATUS_TCP_CSUM_OK - IP and TCP checksum ok. - * SKCS_STATUS_UDP_CSUM_OK - IP and UDP checksum ok. - * SKCS_STATUS_IP_CSUM_OK_NO_UDP - IP checksum OK and no UDP checksum. - * - * Note: If SKCS_OVERWRITE_STATUS is defined, the SKCS_STATUS_XXX values - * returned here can be defined in some header file by the module using CSUM. - * In this way, the calling module can assign return values for its own needs, - * e.g. by assigning bit flags to the individual protocols. - */ -SKCS_STATUS SkCsGetReceiveInfo( -SK_AC *pAc, /* Adapter context struct. */ -void *pIpHeader, /* IP header. */ -unsigned Checksum1, /* Hardware checksum 1. */ -unsigned Checksum2, /* Hardware checksum 2. */ -int NetNumber) /* Net number */ -{ - /* Internet Header Version found in IP header. */ - unsigned InternetHeaderVersion; - - /* Length of the IP header as found in IP header. */ - unsigned IpHeaderLength; - - /* Length of IP data portion. */ - unsigned IpDataLength; - - /* IP header checksum. */ - unsigned IpHeaderChecksum; - - /* IP header options checksum, if any. */ - unsigned IpOptionsChecksum; - - /* IP data checksum, i.e. TCP/UDP checksum. */ - unsigned IpDataChecksum; - - /* Next level protocol identifier found in IP header. */ - unsigned NextLevelProtocol; - - /* The checksum of the "next level protocol", i.e. TCP or UDP. */ - unsigned long NextLevelProtocolChecksum; - - /* Pointer to next level protocol statistics structure. */ - SKCS_PROTO_STATS *NextLevelProtoStats; - - /* Temporary variable. */ - unsigned Tmp; - - Tmp = *(SK_U8 *) - SKCS_IDX(pIpHeader, SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH); - - /* Get the Internet Header Version (IHV). */ - /* Note: The IHV is stored in the upper four bits. */ - - InternetHeaderVersion = Tmp >> 4; - - /* Check the Internet Header Version. */ - /* Note: We currently only support IP version 4. */ - - if (InternetHeaderVersion != 4) { /* IPv4? */ - SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_RX, - ("Rx: Unknown Internet Header Version %u.\n", - InternetHeaderVersion)); - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxUnableCts++; - return (SKCS_STATUS_UNKNOWN_IP_VERSION); - } - - /* Get the IP header length (IHL). */ - /* - * Note: The IHL is stored in the lower four bits as the number of - * 4-byte words. - */ - - IpHeaderLength = (Tmp & 0xf) * 4; - - /* Check the IP header length. */ - - /* 04-Aug-1998 sw - Really check the IHL? Necessary? */ - - if (IpHeaderLength < 5*4) { - SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_RX, - ("Rx: Invalid IP Header Length %u.\n", IpHeaderLength)); - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxErrCts++; - return (SKCS_STATUS_IP_CSUM_ERROR); - } - - /* This is an IPv4 frame with a header of valid length. */ - - /* Get the IP header and data checksum. */ - - IpDataChecksum = Checksum2; - - /* - * The IP header checksum is calculated as follows: - * - * IpHeaderChecksum = Checksum1 - Checksum2 - */ - - SKCS_OC_SUB(IpHeaderChecksum, Checksum1, Checksum2); - - /* Check if any IP header options. */ - - if (IpHeaderLength > SKCS_IP_HEADER_SIZE) { - - /* Get the IP options checksum. */ - - IpOptionsChecksum = SkCsCalculateChecksum( - SKCS_IDX(pIpHeader, SKCS_IP_HEADER_SIZE), - IpHeaderLength - SKCS_IP_HEADER_SIZE); - - /* Adjust the IP header and IP data checksums. */ - - SKCS_OC_ADD(IpHeaderChecksum, IpHeaderChecksum, IpOptionsChecksum); - - SKCS_OC_SUB(IpDataChecksum, IpDataChecksum, IpOptionsChecksum); - } - - /* - * Check if the IP header checksum is ok. - * - * NOTE: We must check the IP header checksum even if the caller just wants - * us to check upper-layer checksums, because we cannot do any further - * processing of the packet without a valid IP checksum. - */ - - /* Get the next level protocol identifier. */ - - NextLevelProtocol = *(SK_U8 *) - SKCS_IDX(pIpHeader, SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL); - - if (IpHeaderChecksum != 0xffff) { - pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].RxErrCts++; - /* the NDIS tester wants to know the upper level protocol too */ - if (NextLevelProtocol == SKCS_PROTO_ID_TCP) { - return(SKCS_STATUS_IP_CSUM_ERROR_TCP); - } - else if (NextLevelProtocol == SKCS_PROTO_ID_UDP) { - return(SKCS_STATUS_IP_CSUM_ERROR_UDP); - } - return (SKCS_STATUS_IP_CSUM_ERROR); - } - - /* - * Check if this is a TCP or UDP frame and if we should calculate the - * TCP/UDP pseudo header checksum. - * - * Also clear all protocol bit flags of protocols not present in the - * frame. - */ - - if ((pAc->Csum.ReceiveFlags[NetNumber] & SKCS_PROTO_TCP) != 0 && - NextLevelProtocol == SKCS_PROTO_ID_TCP) { - /* TCP/IP frame. */ - NextLevelProtoStats = - &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_TCP]; - } - else if ((pAc->Csum.ReceiveFlags[NetNumber] & SKCS_PROTO_UDP) != 0 && - NextLevelProtocol == SKCS_PROTO_ID_UDP) { - /* UDP/IP frame. */ - NextLevelProtoStats = - &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_UDP]; - } - else { - /* - * Either not a TCP or UDP frame and/or TCP/UDP processing not - * specified. - */ - return (SKCS_STATUS_IP_CSUM_OK); - } - - /* Check if this is an IP fragment. */ - - /* - * Note: An IP fragment has a non-zero "Fragment Offset" field and/or - * the "More Fragments" bit set. Thus, if both the "Fragment Offset" - * and the "More Fragments" are zero, it is *not* a fragment. We can - * easily check both at the same time since they are in the same 16-bit - * word. - */ - - if ((*(SK_U16 *) - SKCS_IDX(pIpHeader, SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET) & - ~SKCS_IP_DONT_FRAGMENT) != 0) { - /* IP fragment; ignore all other protocols. */ - NextLevelProtoStats->RxUnableCts++; - return (SKCS_STATUS_IP_FRAGMENT); - } - - /* - * 08-May-2000 ra - * - * From RFC 768 (UDP) - * If the computed checksum is zero, it is transmitted as all ones (the - * equivalent in one's complement arithmetic). An all zero transmitted - * checksum value means that the transmitter generated no checksum (for - * debugging or for higher level protocols that don't care). - */ - - if (NextLevelProtocol == SKCS_PROTO_ID_UDP && - *(SK_U16*)SKCS_IDX(pIpHeader, IpHeaderLength + 6) == 0x0000) { - - NextLevelProtoStats->RxOkCts++; - - return (SKCS_STATUS_IP_CSUM_OK_NO_UDP); - } - - /* - * Calculate the TCP/UDP checksum. - */ - - /* Get total length of IP header and data. */ - - IpDataLength = - *(SK_U16 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_TOTAL_LENGTH); - - /* Get length of IP data portion. */ - - IpDataLength = SKCS_NTOH16(IpDataLength) - IpHeaderLength; - - NextLevelProtocolChecksum = - - /* Calculate the pseudo header checksum. */ - - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_SOURCE_ADDRESS + 0) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_SOURCE_ADDRESS + 2) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_DESTINATION_ADDRESS + 0) + - (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader, - SKCS_OFS_IP_DESTINATION_ADDRESS + 2) + - (unsigned long) SKCS_HTON16(NextLevelProtocol) + - (unsigned long) SKCS_HTON16(IpDataLength) + - - /* Add the TCP/UDP header checksum. */ - - (unsigned long) IpDataChecksum; - - /* Add-in any carries. */ - - SKCS_OC_ADD(NextLevelProtocolChecksum, NextLevelProtocolChecksum, 0); - - /* Add-in any new carry. */ - - SKCS_OC_ADD(NextLevelProtocolChecksum, NextLevelProtocolChecksum, 0); - - /* Check if the TCP/UDP checksum is ok. */ - - if ((unsigned) NextLevelProtocolChecksum == 0xffff) { - - /* TCP/UDP checksum ok. */ - - NextLevelProtoStats->RxOkCts++; - - return (NextLevelProtocol == SKCS_PROTO_ID_TCP ? - SKCS_STATUS_TCP_CSUM_OK : SKCS_STATUS_UDP_CSUM_OK); - } - - /* TCP/UDP checksum error. */ - - NextLevelProtoStats->RxErrCts++; - - return (NextLevelProtocol == SKCS_PROTO_ID_TCP ? - SKCS_STATUS_TCP_CSUM_ERROR : SKCS_STATUS_UDP_CSUM_ERROR); -} /* SkCsGetReceiveInfo */ - - -/****************************************************************************** - * - * SkCsSetReceiveFlags - set checksum receive flags - * - * Description: - * Use this function to set the various receive flags. According to the - * protocol flags set by the caller, the start offsets within received - * packets of the two hardware checksums are returned. These offsets must - * be stored in all receive descriptors. - * - * Arguments: - * pAc - Pointer to adapter context struct. - * - * ReceiveFlags - Any combination of SK_PROTO_XXX flags of the protocols - * for which the caller wants checksum information on received frames. - * - * pChecksum1Offset - The start offset of the first receive descriptor - * hardware checksum to be calculated for received frames is returned - * here. - * - * pChecksum2Offset - The start offset of the second receive descriptor - * hardware checksum to be calculated for received frames is returned - * here. - * - * Returns: N/A - * Returns the two hardware checksum start offsets. - */ -void SkCsSetReceiveFlags( -SK_AC *pAc, /* Adapter context struct. */ -unsigned ReceiveFlags, /* New receive flags. */ -unsigned *pChecksum1Offset, /* Offset for hardware checksum 1. */ -unsigned *pChecksum2Offset, /* Offset for hardware checksum 2. */ -int NetNumber) -{ - /* Save the receive flags. */ - - pAc->Csum.ReceiveFlags[NetNumber] = ReceiveFlags; - - /* First checksum start offset is the IP header. */ - *pChecksum1Offset = SKCS_MAC_HEADER_SIZE; - - /* - * Second checksum start offset is the IP data. Note that this may vary - * if there are any IP header options in the actual packet. - */ - *pChecksum2Offset = SKCS_MAC_HEADER_SIZE + SKCS_IP_HEADER_SIZE; -} /* SkCsSetReceiveFlags */ - -#ifndef SK_CS_CALCULATE_CHECKSUM - -/****************************************************************************** - * - * SkCsCalculateChecksum - calculate checksum for specified data - * - * Description: - * Calculate and return the 16-bit Internet Checksum for the specified - * data. - * - * Arguments: - * pData - Pointer to data for which the checksum shall be calculated. - * Note: The pointer should be aligned on a 16-bit boundary. - * - * Length - Length in bytes of data to checksum. - * - * Returns: - * The 16-bit Internet Checksum for the specified data. - * - * Note: The checksum is calculated in the machine's natural byte order, - * i.e. little vs. big endian. Thus, the resulting checksum is different - * for the same input data on little and big endian machines. - * - * However, when written back to the network packet, the byte order is - * always in correct network order. - */ -unsigned SkCsCalculateChecksum( -void *pData, /* Data to checksum. */ -unsigned Length) /* Length of data. */ -{ - SK_U16 *pU16; /* Pointer to the data as 16-bit words. */ - unsigned long Checksum; /* Checksum; must be at least 32 bits. */ - - /* Sum up all 16-bit words. */ - - pU16 = (SK_U16 *) pData; - for (Checksum = 0; Length > 1; Length -= 2) { - Checksum += *pU16++; - } - - /* If this is an odd number of bytes, add-in the last byte. */ - - if (Length > 0) { -#ifdef SK_BIG_ENDIAN - /* Add the last byte as the high byte. */ - Checksum += ((unsigned) *(SK_U8 *) pU16) << 8; -#else /* !SK_BIG_ENDIAN */ - /* Add the last byte as the low byte. */ - Checksum += *(SK_U8 *) pU16; -#endif /* !SK_BIG_ENDIAN */ - } - - /* Add-in any carries. */ - - SKCS_OC_ADD(Checksum, Checksum, 0); - - /* Add-in any new carry. */ - - SKCS_OC_ADD(Checksum, Checksum, 0); - - /* Note: All bits beyond the 16-bit limit are now zero. */ - - return ((unsigned) Checksum); -} /* SkCsCalculateChecksum */ - -#endif /* SK_CS_CALCULATE_CHECKSUM */ - -/****************************************************************************** - * - * SkCsEvent - the CSUM event dispatcher - * - * Description: - * This is the event handler for the CSUM module. - * - * Arguments: - * pAc - Pointer to adapter context. - * - * Ioc - I/O context. - * - * Event - Event id. - * - * Param - Event dependent parameter. - * - * Returns: - * The 16-bit Internet Checksum for the specified data. - * - * Note: The checksum is calculated in the machine's natural byte order, - * i.e. little vs. big endian. Thus, the resulting checksum is different - * for the same input data on little and big endian machines. - * - * However, when written back to the network packet, the byte order is - * always in correct network order. - */ -int SkCsEvent( -SK_AC *pAc, /* Pointer to adapter context. */ -SK_IOC Ioc, /* I/O context. */ -SK_U32 Event, /* Event id. */ -SK_EVPARA Param) /* Event dependent parameter. */ -{ - int ProtoIndex; - int NetNumber; - - switch (Event) { - /* - * Clear protocol statistics. - * - * Param - Protocol index, or -1 for all protocols. - * - Net number. - */ - case SK_CSUM_EVENT_CLEAR_PROTO_STATS: - - ProtoIndex = (int)Param.Para32[1]; - NetNumber = (int)Param.Para32[0]; - if (ProtoIndex < 0) { /* Clear for all protocols. */ - if (NetNumber >= 0) { - SK_MEMSET(&pAc->Csum.ProtoStats[NetNumber][0], 0, - sizeof(pAc->Csum.ProtoStats[NetNumber])); - } - } - else { /* Clear for individual protocol. */ - SK_MEMSET(&pAc->Csum.ProtoStats[NetNumber][ProtoIndex], 0, - sizeof(pAc->Csum.ProtoStats[NetNumber][ProtoIndex])); - } - break; - default: - break; - } - return (0); /* Success. */ -} /* SkCsEvent */ - -#endif /* SK_USE_CSUM */ |