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Merge pull request #4458 from davidhorstmann-arm/remove-max-content-len

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Remove MBEDTLS_SSL_MAX_CONTENT_LEN option
This commit is contained in:
Ronald Cron
2021-05-17 16:36:04 +02:00
committed by GitHub
parent 864b425156 fba138a08a
commit fdcde47f36
11 changed files with 41 additions and 70 deletions
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38
include/mbedtls/config.h
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@ -3531,32 +3531,6 @@
/* SSL options */
/** \def MBEDTLS_SSL_MAX_CONTENT_LEN
*
* Maximum length (in bytes) of incoming and outgoing plaintext fragments.
*
* This determines the size of both the incoming and outgoing TLS I/O buffers
* in such a way that both are capable of holding the specified amount of
* plaintext data, regardless of the protection mechanism used.
*
* To configure incoming and outgoing I/O buffers separately, use
* #MBEDTLS_SSL_IN_CONTENT_LEN and #MBEDTLS_SSL_OUT_CONTENT_LEN,
* which overwrite the value set by this option.
*
* \note When using a value less than the default of 16KB on the client, it is
* recommended to use the Maximum Fragment Length (MFL) extension to
* inform the server about this limitation. On the server, there
* is no supported, standardized way of informing the client about
* restriction on the maximum size of incoming messages, and unless
* the limitation has been communicated by other means, it is recommended
* to only change the outgoing buffer size #MBEDTLS_SSL_OUT_CONTENT_LEN
* while keeping the default value of 16KB for the incoming buffer.
*
* Uncomment to set the maximum plaintext size of both
* incoming and outgoing I/O buffers.
*/
//#define MBEDTLS_SSL_MAX_CONTENT_LEN 16384
/** \def MBEDTLS_SSL_IN_CONTENT_LEN
*
* Maximum length (in bytes) of incoming plaintext fragments.
@ -3565,9 +3539,6 @@
* that it is capable of holding the specified amount of plaintext data,
* regardless of the protection mechanism used.
*
* If this option is undefined, it inherits its value from
* #MBEDTLS_SSL_MAX_CONTENT_LEN.
*
* \note When using a value less than the default of 16KB on the client, it is
* recommended to use the Maximum Fragment Length (MFL) extension to
* inform the server about this limitation. On the server, there
@ -3577,8 +3548,7 @@
* to only change the outgoing buffer size #MBEDTLS_SSL_OUT_CONTENT_LEN
* while keeping the default value of 16KB for the incoming buffer.
*
* Uncomment to set the maximum plaintext size of the incoming I/O buffer
* independently of the outgoing I/O buffer.
* Uncomment to set the maximum plaintext size of the incoming I/O buffer.
*/
//#define MBEDTLS_SSL_IN_CONTENT_LEN 16384
@ -3637,9 +3607,6 @@
* that it is capable of holding the specified amount of plaintext data,
* regardless of the protection mechanism used.
*
* If this option undefined, it inherits its value from
* #MBEDTLS_SSL_MAX_CONTENT_LEN.
*
* It is possible to save RAM by setting a smaller outward buffer, while keeping
* the default inward 16384 byte buffer to conform to the TLS specification.
*
@ -3648,8 +3615,7 @@
* The specific size requirement depends on the configured ciphers and any
* certificate data which is sent during the handshake.
*
* Uncomment to set the maximum plaintext size of the outgoing I/O buffer
* independently of the incoming I/O buffer.
* Uncomment to set the maximum plaintext size of the outgoing I/O buffer.
*/
//#define MBEDTLS_SSL_OUT_CONTENT_LEN 16384

10
include/mbedtls/ssl.h
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@ -236,16 +236,12 @@
* if you're using the Max Fragment Length extension and you know all your
* peers are using it too!
*/
#if !defined(MBEDTLS_SSL_MAX_CONTENT_LEN)
#define MBEDTLS_SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */
#endif
#if !defined(MBEDTLS_SSL_IN_CONTENT_LEN)
#define MBEDTLS_SSL_IN_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
#define MBEDTLS_SSL_IN_CONTENT_LEN 16384
#endif
#if !defined(MBEDTLS_SSL_OUT_CONTENT_LEN)
#define MBEDTLS_SSL_OUT_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
#define MBEDTLS_SSL_OUT_CONTENT_LEN 16384
#endif
/*
@ -3619,7 +3615,7 @@ size_t mbedtls_ssl_get_output_max_frag_len( const mbedtls_ssl_context *ssl );
/**
* \brief Return the maximum fragment length (payload, in bytes) for
* the input buffer. This is the negotiated maximum fragment
* length, or, if there is none, MBEDTLS_SSL_MAX_CONTENT_LEN.
* length, or, if there is none, MBEDTLS_SSL_IN_CONTENT_LEN.
* If it is not defined either, the value is 2^14. This function
* works as its predecessor, \c mbedtls_ssl_get_max_frag_len().
*