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Split the maximum fragment length into two - an input and output MFL

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Since the server might want to have a different maximum fragment length
for the outgoing messages than the negotiated one - introduce a new way of
computing it. This commit also adds additional ssl-opt.sh tests ensuring
that the maximum fragment lengths are set as expected. 
mbedtls_ssl_get_max_frag_len() is now a deprecated function,
being an alias to mbedtls_ssl_get_output_max_frag_len(). The behaviour
of this function is the same as before.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek
2020-04-03 05:25:29 -04:00
parent d4a720f541
commit 90c6e84a9c
8 changed files with 328 additions and 40 deletions
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library/ssl_msg.c
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@ -214,7 +214,7 @@ static int ssl_get_remaining_payload_in_datagram( mbedtls_ssl_context const *ssl
size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl );
const size_t mfl = mbedtls_ssl_get_output_max_frag_len( ssl );
if( max_len > mfl )
max_len = mfl;