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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 malformatted. 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 malformatted
**/
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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