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Merge branch 'iotssl-2402-basic-pmtu-adaptation' into datagram_packing

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This commit is contained in:
Hanno Becker 2018-08-22 10:05:20 +01:00
commit a67dee256d
4 changed files with 51 additions and 4 deletions
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32
library/ssl_tls.c
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@ -108,9 +108,10 @@ static void ssl_update_in_pointers( mbedtls_ssl_context *ssl,
#if defined(MBEDTLS_SSL_PROTO_DTLS)
static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl );
static uint16_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl )
{
uint16_t mtu = ssl->mtu;
uint16_t mtu = ssl_get_current_mtu( ssl );
if( mtu != 0 && mtu < MBEDTLS_SSL_OUT_BUFFER_LEN )
return( (int) mtu );
@ -178,6 +179,15 @@ static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
return( -1 );
/* Implement the final paragraph of RFC 6347 section 4.1.1.1
* in the following way: after the initial transmission and a first
* retransmission, back off to a temporary estimated MTU of 508 bytes.
* This value is guaranteed to be deliverable (if not guaranteed to be
* delivered) of any compliant IPv4 (and IPv6) network, and should work
* on most non-IP stacks too. */
if( ssl->handshake->retransmit_timeout != ssl->conf->hs_timeout_min )
ssl->handshake->mtu = 508;
new_timeout = 2 * ssl->handshake->retransmit_timeout;
/* Avoid arithmetic overflow and range overflow */
@ -7319,6 +7329,20 @@ size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl )
{
if( ssl->handshake == NULL || ssl->handshake->mtu == 0 )
return( ssl->mtu );
if( ssl->mtu == 0 )
return( ssl->handshake->mtu );
return( ssl->mtu < ssl->handshake->mtu ?
ssl->mtu : ssl->handshake->mtu );
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
{
size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
@ -7336,9 +7360,9 @@ int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->mtu != 0 )
if( ssl_get_current_mtu( ssl ) != 0 )
{
const size_t mtu = ssl->mtu;
const size_t mtu = ssl_get_current_mtu( ssl );
const int ret = mbedtls_ssl_get_record_expansion( ssl );
const size_t overhead = (size_t) ret;
@ -7354,7 +7378,7 @@ int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
if( max_len > mtu - overhead )
max_len = mtu - overhead;
}
#endif
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
!defined(MBEDTLS_SSL_PROTO_DTLS)