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67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/** @file
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IP4 option support routines.
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Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __EFI_IP4_OPTION_H__
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#define __EFI_IP4_OPTION_H__
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#define IP4_OPTION_EOP 0
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#define IP4_OPTION_NOP 1
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#define IP4_OPTION_LSRR 131 // Loss source and record routing, 10000011
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#define IP4_OPTION_SSRR 137 // Strict source and record routing, 10001001
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#define IP4_OPTION_RR 7 // Record routing, 00000111
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#define IP4_OPTION_COPY_MASK 0x80
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/**
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Validate the IP4 option format for both the packets we received
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and will transmit. It will compute the ICMP error message fields
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if the option is mal-formated. But this information isn't used.
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@param[in] Option The first byte of the option
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@param[in] OptionLen The length of the whole option
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@param[in] Rcvd The option is from the packet we received if TRUE,
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otherwise the option we wants to transmit.
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@retval TRUE The option is properly formatted
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@retval FALSE The option is mal-formated
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**/
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BOOLEAN
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Ip4OptionIsValid (
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IN UINT8 *Option,
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IN UINT32 OptionLen,
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IN BOOLEAN Rcvd
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);
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/**
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Copy the option from the original option to buffer. It
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handles the details such as:
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1. whether copy the single IP4 option to the first/non-first
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fragments.
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2. Pad the options copied over to aligned to 4 bytes.
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@param[in] Option The original option to copy from
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@param[in] OptionLen The length of the original option
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@param[in] FirstFragment Whether it is the first fragment
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@param[in, out] Buf The buffer to copy options to. NULL
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@param[in, out] BufLen The length of the buffer
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@retval EFI_SUCCESS The options are copied over
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@retval EFI_BUFFER_TOO_SMALL Buf is NULL or BufLen provided is too small.
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**/
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EFI_STATUS
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Ip4CopyOption (
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IN UINT8 *Option,
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IN UINT32 OptionLen,
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IN BOOLEAN FirstFragment,
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IN OUT UINT8 *Buf, OPTIONAL
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IN OUT UINT32 *BufLen
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);
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#endif
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