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@@ -1,871 +0,0 @@
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-/******************************************************************************
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- *
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- * Name: skcsum.c
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- * Project: GEnesis, PCI Gigabit Ethernet Adapter
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- * Version: $Revision: 1.12 $
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- * Date: $Date: 2003/08/20 13:55:53 $
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- * Purpose: Store/verify Internet checksum in send/receive packets.
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- *
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- ******************************************************************************/
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-
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-/******************************************************************************
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- *
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- * (C)Copyright 1998-2003 SysKonnect GmbH.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * The information in this file is provided "AS IS" without warranty.
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- *
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- ******************************************************************************/
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-
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-#ifdef SK_USE_CSUM /* Check if CSUM is to be used. */
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-
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-#ifndef lint
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-static const char SysKonnectFileId[] =
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- "@(#) $Id: skcsum.c,v 1.12 2003/08/20 13:55:53 mschmid Exp $ (C) SysKonnect.";
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-#endif /* !lint */
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-
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-/******************************************************************************
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- *
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- * Description:
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- *
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- * This is the "GEnesis" common module "CSUM".
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- *
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- * This module contains the code necessary to calculate, store, and verify the
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- * Internet Checksum of IP, TCP, and UDP frames.
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- *
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- * "GEnesis" is an abbreviation of "Gigabit Ethernet Network System in Silicon"
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- * and is the code name of this SysKonnect project.
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- *
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- * Compilation Options:
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- *
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- * SK_USE_CSUM - Define if CSUM is to be used. Otherwise, CSUM will be an
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- * empty module.
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- *
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- * SKCS_OVERWRITE_PROTO - Define to overwrite the default protocol id
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- * definitions. In this case, all SKCS_PROTO_xxx definitions must be made
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- * external.
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- *
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- * SKCS_OVERWRITE_STATUS - Define to overwrite the default return status
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- * definitions. In this case, all SKCS_STATUS_xxx definitions must be made
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- * external.
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- *
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- * Include File Hierarchy:
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- *
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- * "h/skdrv1st.h"
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- * "h/skcsum.h"
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- * "h/sktypes.h"
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- * "h/skqueue.h"
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- * "h/skdrv2nd.h"
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- *
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- ******************************************************************************/
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-
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-#include "h/skdrv1st.h"
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-#include "h/skcsum.h"
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-#include "h/skdrv2nd.h"
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-
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-/* defines ********************************************************************/
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-
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-/* The size of an Ethernet MAC header. */
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-#define SKCS_ETHERNET_MAC_HEADER_SIZE (6+6+2)
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-
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-/* The size of the used topology's MAC header. */
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-#define SKCS_MAC_HEADER_SIZE SKCS_ETHERNET_MAC_HEADER_SIZE
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-
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-/* The size of the IP header without any option fields. */
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-#define SKCS_IP_HEADER_SIZE 20
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-
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-/*
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- * Field offsets within the IP header.
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- */
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-
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-/* "Internet Header Version" and "Length". */
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-#define SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH 0
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-
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-/* "Total Length". */
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-#define SKCS_OFS_IP_TOTAL_LENGTH 2
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-
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-/* "Flags" "Fragment Offset". */
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-#define SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET 6
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-
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-/* "Next Level Protocol" identifier. */
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-#define SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL 9
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-
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-/* Source IP address. */
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-#define SKCS_OFS_IP_SOURCE_ADDRESS 12
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-
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-/* Destination IP address. */
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-#define SKCS_OFS_IP_DESTINATION_ADDRESS 16
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-
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-
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-/*
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- * Field offsets within the UDP header.
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- */
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-
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-/* UDP checksum. */
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-#define SKCS_OFS_UDP_CHECKSUM 6
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-
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-/* IP "Next Level Protocol" identifiers (see RFC 790). */
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-#define SKCS_PROTO_ID_TCP 6 /* Transport Control Protocol */
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-#define SKCS_PROTO_ID_UDP 17 /* User Datagram Protocol */
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-
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-/* IP "Don't Fragment" bit. */
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-#define SKCS_IP_DONT_FRAGMENT SKCS_HTON16(0x4000)
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-
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-/* Add a byte offset to a pointer. */
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-#define SKCS_IDX(pPtr, Ofs) ((void *) ((char *) (pPtr) + (Ofs)))
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-
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-/*
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- * Macros that convert host to network representation and vice versa, i.e.
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- * little/big endian conversion on little endian machines only.
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- */
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-#ifdef SK_LITTLE_ENDIAN
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-#define SKCS_HTON16(Val16) (((unsigned) (Val16) >> 8) | (((Val16) & 0xff) << 8))
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-#endif /* SK_LITTLE_ENDIAN */
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-#ifdef SK_BIG_ENDIAN
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-#define SKCS_HTON16(Val16) (Val16)
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-#endif /* SK_BIG_ENDIAN */
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-#define SKCS_NTOH16(Val16) SKCS_HTON16(Val16)
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-
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-/* typedefs *******************************************************************/
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-
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-/* function prototypes ********************************************************/
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-
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-/******************************************************************************
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- *
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- * SkCsGetSendInfo - get checksum information for a send packet
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- *
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- * Description:
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- * Get all checksum information necessary to send a TCP or UDP packet. The
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- * function checks the IP header passed to it. If the high-level protocol
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- * is either TCP or UDP the pseudo header checksum is calculated and
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- * returned.
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- *
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- * The function returns the total length of the IP header (including any
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- * IP option fields), which is the same as the start offset of the IP data
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- * which in turn is the start offset of the TCP or UDP header.
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- *
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- * The function also returns the TCP or UDP pseudo header checksum, which
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- * should be used as the start value for the hardware checksum calculation.
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- * (Note that any actual pseudo header checksum can never calculate to
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- * zero.)
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- *
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- * Note:
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- * There is a bug in the GENESIS ASIC which may lead to wrong checksums.
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- *
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- * Arguments:
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- * pAc - A pointer to the adapter context struct.
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- *
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- * pIpHeader - Pointer to IP header. Must be at least the IP header *not*
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- * including any option fields, i.e. at least 20 bytes.
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- *
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- * Note: This pointer will be used to address 8-, 16-, and 32-bit
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- * variables with the respective alignment offsets relative to the pointer.
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- * Thus, the pointer should point to a 32-bit aligned address. If the
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- * target system cannot address 32-bit variables on non 32-bit aligned
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- * addresses, then the pointer *must* point to a 32-bit aligned address.
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- *
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- * pPacketInfo - A pointer to the packet information structure for this
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- * packet. Before calling this SkCsGetSendInfo(), the following field must
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- * be initialized:
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- *
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- * ProtocolFlags - Initialize with any combination of
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- * SKCS_PROTO_XXX bit flags. SkCsGetSendInfo() will only work on
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- * the protocols specified here. Any protocol(s) not specified
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- * here will be ignored.
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- *
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- * Note: Only one checksum can be calculated in hardware. Thus, if
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- * SKCS_PROTO_IP is specified in the 'ProtocolFlags',
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- * SkCsGetSendInfo() must calculate the IP header checksum in
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- * software. It might be a better idea to have the calling
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- * protocol stack calculate the IP header checksum.
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- *
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- * Returns: N/A
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- * On return, the following fields in 'pPacketInfo' may or may not have
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- * been filled with information, depending on the protocol(s) found in the
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- * packet:
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- *
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- * ProtocolFlags - Returns the SKCS_PROTO_XXX bit flags of the protocol(s)
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- * that were both requested by the caller and actually found in the packet.
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- * Protocol(s) not specified by the caller and/or not found in the packet
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- * will have their respective SKCS_PROTO_XXX bit flags reset.
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- *
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- * Note: For IP fragments, TCP and UDP packet information is ignored.
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- *
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- * IpHeaderLength - The total length in bytes of the complete IP header
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- * including any option fields is returned here. This is the start offset
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- * of the IP data, i.e. the TCP or UDP header if present.
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- *
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- * IpHeaderChecksum - If IP has been specified in the 'ProtocolFlags', the
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- * 16-bit Internet Checksum of the IP header is returned here. This value
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- * is to be stored into the packet's 'IP Header Checksum' field.
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- *
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- * PseudoHeaderChecksum - If this is a TCP or UDP packet and if TCP or UDP
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- * has been specified in the 'ProtocolFlags', the 16-bit Internet Checksum
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- * of the TCP or UDP pseudo header is returned here.
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- */
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-void SkCsGetSendInfo(
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-SK_AC *pAc, /* Adapter context struct. */
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-void *pIpHeader, /* IP header. */
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-SKCS_PACKET_INFO *pPacketInfo, /* Packet information struct. */
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-int NetNumber) /* Net number */
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-{
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- /* Internet Header Version found in IP header. */
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- unsigned InternetHeaderVersion;
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-
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- /* Length of the IP header as found in IP header. */
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- unsigned IpHeaderLength;
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-
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- /* Bit field specifiying the desired/found protocols. */
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- unsigned ProtocolFlags;
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-
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- /* Next level protocol identifier found in IP header. */
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- unsigned NextLevelProtocol;
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-
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- /* Length of IP data portion. */
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- unsigned IpDataLength;
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-
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- /* TCP/UDP pseudo header checksum. */
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- unsigned long PseudoHeaderChecksum;
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-
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- /* Pointer to next level protocol statistics structure. */
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- SKCS_PROTO_STATS *NextLevelProtoStats;
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-
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- /* Temporary variable. */
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- unsigned Tmp;
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-
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- Tmp = *(SK_U8 *)
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- SKCS_IDX(pIpHeader, SKCS_OFS_IP_HEADER_VERSION_AND_LENGTH);
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-
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- /* Get the Internet Header Version (IHV). */
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- /* Note: The IHV is stored in the upper four bits. */
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-
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- InternetHeaderVersion = Tmp >> 4;
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-
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- /* Check the Internet Header Version. */
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- /* Note: We currently only support IP version 4. */
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-
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- if (InternetHeaderVersion != 4) { /* IPv4? */
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- SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX,
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- ("Tx: Unknown Internet Header Version %u.\n",
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- InternetHeaderVersion));
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- pPacketInfo->ProtocolFlags = 0;
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- pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++;
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- return;
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- }
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-
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- /* Get the IP header length (IHL). */
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- /*
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- * Note: The IHL is stored in the lower four bits as the number of
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- * 4-byte words.
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- */
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-
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- IpHeaderLength = (Tmp & 0xf) * 4;
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- pPacketInfo->IpHeaderLength = IpHeaderLength;
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-
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- /* Check the IP header length. */
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-
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- /* 04-Aug-1998 sw - Really check the IHL? Necessary? */
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-
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- if (IpHeaderLength < 5*4) {
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- SK_DBG_MSG(pAc, SK_DBGMOD_CSUM, SK_DBGCAT_ERR | SK_DBGCAT_TX,
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- ("Tx: Invalid IP Header Length %u.\n", IpHeaderLength));
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- pPacketInfo->ProtocolFlags = 0;
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- pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxUnableCts++;
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- return;
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- }
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-
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- /* This is an IPv4 frame with a header of valid length. */
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-
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- pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_IP].TxOkCts++;
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-
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- /* Check if we should calculate the IP header checksum. */
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-
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- ProtocolFlags = pPacketInfo->ProtocolFlags;
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-
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- if (ProtocolFlags & SKCS_PROTO_IP) {
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- pPacketInfo->IpHeaderChecksum =
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- SkCsCalculateChecksum(pIpHeader, IpHeaderLength);
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- }
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-
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- /* Get the next level protocol identifier. */
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-
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- NextLevelProtocol =
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- *(SK_U8 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_NEXT_LEVEL_PROTOCOL);
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-
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- /*
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- * Check if this is a TCP or UDP frame and if we should calculate the
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- * TCP/UDP pseudo header checksum.
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- *
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- * Also clear all protocol bit flags of protocols not present in the
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- * frame.
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- */
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-
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- if ((ProtocolFlags & SKCS_PROTO_TCP) != 0 &&
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- NextLevelProtocol == SKCS_PROTO_ID_TCP) {
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- /* TCP/IP frame. */
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- ProtocolFlags &= SKCS_PROTO_TCP | SKCS_PROTO_IP;
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- NextLevelProtoStats =
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- &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_TCP];
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- }
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- else if ((ProtocolFlags & SKCS_PROTO_UDP) != 0 &&
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- NextLevelProtocol == SKCS_PROTO_ID_UDP) {
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- /* UDP/IP frame. */
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- ProtocolFlags &= SKCS_PROTO_UDP | SKCS_PROTO_IP;
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- NextLevelProtoStats =
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- &pAc->Csum.ProtoStats[NetNumber][SKCS_PROTO_STATS_UDP];
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- }
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- else {
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- /*
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- * Either not a TCP or UDP frame and/or TCP/UDP processing not
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- * specified.
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- */
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- pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP;
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- return;
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- }
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-
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- /* Check if this is an IP fragment. */
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-
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- /*
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- * Note: An IP fragment has a non-zero "Fragment Offset" field and/or
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- * the "More Fragments" bit set. Thus, if both the "Fragment Offset"
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- * and the "More Fragments" are zero, it is *not* a fragment. We can
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- * easily check both at the same time since they are in the same 16-bit
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- * word.
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- */
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-
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- if ((*(SK_U16 *)
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- SKCS_IDX(pIpHeader, SKCS_OFS_IP_FLAGS_AND_FRAGMENT_OFFSET) &
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- ~SKCS_IP_DONT_FRAGMENT) != 0) {
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- /* IP fragment; ignore all other protocols. */
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- pPacketInfo->ProtocolFlags = ProtocolFlags & SKCS_PROTO_IP;
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- NextLevelProtoStats->TxUnableCts++;
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- return;
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- }
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-
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- /*
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- * Calculate the TCP/UDP pseudo header checksum.
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- */
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-
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- /* Get total length of IP header and data. */
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-
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- IpDataLength =
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- *(SK_U16 *) SKCS_IDX(pIpHeader, SKCS_OFS_IP_TOTAL_LENGTH);
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-
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- /* Get length of IP data portion. */
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-
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- IpDataLength = SKCS_NTOH16(IpDataLength) - IpHeaderLength;
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-
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- /* Calculate the sum of all pseudo header fields (16-bit). */
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-
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- PseudoHeaderChecksum =
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- (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
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- SKCS_OFS_IP_SOURCE_ADDRESS + 0) +
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- (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
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- SKCS_OFS_IP_SOURCE_ADDRESS + 2) +
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- (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
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- SKCS_OFS_IP_DESTINATION_ADDRESS + 0) +
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- (unsigned long) *(SK_U16 *) SKCS_IDX(pIpHeader,
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- SKCS_OFS_IP_DESTINATION_ADDRESS + 2) +
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- (unsigned long) SKCS_HTON16(NextLevelProtocol) +
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- (unsigned long) SKCS_HTON16(IpDataLength);
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-
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- /* Add-in any carries. */
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-
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- SKCS_OC_ADD(PseudoHeaderChecksum, PseudoHeaderChecksum, 0);
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-
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- /* Add-in any new carry. */
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-
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- SKCS_OC_ADD(pPacketInfo->PseudoHeaderChecksum, PseudoHeaderChecksum, 0);
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-
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- pPacketInfo->ProtocolFlags = ProtocolFlags;
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- NextLevelProtoStats->TxOkCts++; /* Success. */
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-} /* SkCsGetSendInfo */
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-
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-
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-/******************************************************************************
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- *
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- * SkCsGetReceiveInfo - verify checksum information for a received packet
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- *
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- * 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 */
|
Jeff Garzik