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Implement support for MTU setting

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This commit is contained in:
Manuel Pégourié-Gonnard
2017-09-21 13:49:50 +02:00
parent 0b1d9b2c75
commit 9468ff1966
2 changed files with 92 additions and 20 deletions
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69
library/ssl_tls.c
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@@ -2845,16 +2845,20 @@ int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
*/
int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
const size_t max_record_content_len = mbedtls_ssl_get_max_frag_len( ssl );
#else
const size_t max_record_content_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
#endif
const int ret_payload = mbedtls_ssl_get_max_out_record_payload( ssl );
const size_t max_record_payload = (size_t) ret_payload;
/* DTLS handshake headers are 12 bytes */
const size_t max_hs_fragment_len = max_record_content_len - 12;
const size_t max_hs_fragment_len = max_record_payload - 12;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_flight_transmit" ) );
if( ret_payload < 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_max_out_record_payload",
ret_payload );
return( ret_payload );
}
if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise fligh transmission" ) );
@@ -7008,6 +7012,7 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_ZLIB_SUPPORT)
if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
#endif
switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
@@ -7055,10 +7060,45 @@ size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
}
return max_len;
return( max_len );
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *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 );
if( max_len > mfl )
max_len = mfl;
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->mtu != 0 )
{
const size_t mtu = ssl->conf->mtu;
const int ret = mbedtls_ssl_get_record_expansion( ssl );
const size_t overhead = (size_t) ret;
if( ret < 0 )
return( ret );
if( mtu <= overhead )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) );
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
if( max_len > mtu - overhead )
max_len = mtu - overhead;
}
#endif
return( (int) max_len );
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
{
@@ -7610,12 +7650,15 @@ int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
static int ssl_write_real( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
int ret;
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
#else
size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
int ret = mbedtls_ssl_get_max_out_record_payload( ssl );
const size_t max_len = (size_t) ret;
if( ret < 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_max_out_record_payload", ret );
return( ret );
}
if( len > max_len )
{
#if defined(MBEDTLS_SSL_PROTO_DTLS)