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DTLS Reordering: Improve doc of MBEDTLS_SSL_DTLS_MAX_BUFFERING

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Hanno Becker 2018-08-28 09:46:44 +01:00
parent 159a37f75d
commit 280075104e
2 changed files with 14 additions and 1 deletions
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9
include/mbedtls/config.h
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@ -3015,6 +3015,15 @@
* Maximum number of heap-allocated bytes for the purpose of * Maximum number of heap-allocated bytes for the purpose of
* DTLS handshake message reassembly and future message buffering. * DTLS handshake message reassembly and future message buffering.
* *
* This should be at least 9/8 * MBEDTLSSL_MAX_IN_CONTENT_LEN
* to account for a reassembled handshake message of maximum size,
* together with its reassembly bitmap.
*
* A value of 2 * MBEDTLS_SSL_MAX_IN_CONTENT_LEN (32768 by default)
* should be sufficient for all practical situations as it allows
* to reassembly a large handshake message (such as a certificate)
* while buffering multiple smaller handshake messages.
*
*/ */
//#define MBEDTLS_SSL_DTLS_MAX_BUFFERING 32768 //#define MBEDTLS_SSL_DTLS_MAX_BUFFERING 32768

6
include/mbedtls/ssl.h
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@ -243,8 +243,12 @@
#define MBEDTLS_SSL_OUT_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN #define MBEDTLS_SSL_OUT_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
#endif #endif
/*
* Maximum number of heap-allocated bytes for the purpose of
* DTLS handshake message reassembly and future message buffering.
*/
#if !defined(MBEDTLS_SSL_DTLS_MAX_BUFFERING) #if !defined(MBEDTLS_SSL_DTLS_MAX_BUFFERING)
#define MBEDTLS_SSL_DTLS_MAX_BUFFERING ( 2 * MBEDTLS_SSL_IN_CONTENT_LEN ) #define MBEDTLS_SSL_DTLS_MAX_BUFFERING 32768
#endif #endif
/* \} name SECTION: Module settings */ /* \} name SECTION: Module settings */