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