mirror of
https://github.com/cuberite/polarssl.git
synced 2025-11-04 04:32:24 -05:00
Don't immediately flush datagram after preparing a record
This commit finally enables datagram packing by modifying the record preparation function ssl_write_record() to not always calling mbedtls_ssl_flush_output().
This commit is contained in:
Hanno Becker
parent
2b1e354754
commit
67bc7c3a38
@ -561,7 +561,7 @@ int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl );
|
||||
int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want );
|
||||
|
||||
int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl );
|
||||
int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl );
|
||||
int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush );
|
||||
int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl );
|
||||
|
||||
int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl );
|
||||
|
||||
@ -100,6 +100,10 @@ static void ssl_update_out_pointers( mbedtls_ssl_context *ssl,
|
||||
mbedtls_ssl_transform *transform );
|
||||
static void ssl_update_in_pointers( mbedtls_ssl_context *ssl,
|
||||
mbedtls_ssl_transform *transform );
|
||||
|
||||
#define SSL_DONT_FORCE_FLUSH 0
|
||||
#define SSL_FORCE_FLUSH 1
|
||||
|
||||
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
||||
|
||||
static uint16_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl )
|
||||
@ -112,6 +116,55 @@ static uint16_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl )
|
||||
return( MBEDTLS_SSL_OUT_BUFFER_LEN );
|
||||
}
|
||||
|
||||
static int ssl_get_remaining_space_in_datagram( mbedtls_ssl_context const *ssl )
|
||||
{
|
||||
size_t const bytes_written = ssl->out_left;
|
||||
uint16_t const mtu = ssl_get_maximum_datagram_size( ssl );
|
||||
|
||||
/* Double-check that the write-index hasn't gone
|
||||
* past what we can transmit in a single datagram. */
|
||||
if( bytes_written > (size_t) mtu )
|
||||
{
|
||||
/* Should never happen... */
|
||||
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
||||
}
|
||||
|
||||
return( (int) ( mtu - bytes_written ) );
|
||||
}
|
||||
|
||||
static int ssl_get_remaining_payload_in_datagram( mbedtls_ssl_context const *ssl )
|
||||
{
|
||||
int ret;
|
||||
size_t remaining, expansion;
|
||||
size_t max_len = MBEDTLS_SSL_MAX_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
|
||||
|
||||
ret = ssl_get_remaining_space_in_datagram( ssl );
|
||||
if( ret < 0 )
|
||||
return( ret );
|
||||
remaining = (size_t) ret;
|
||||
|
||||
ret = mbedtls_ssl_get_record_expansion( ssl );
|
||||
if( ret < 0 )
|
||||
return( ret );
|
||||
expansion = (size_t) ret;
|
||||
|
||||
if( remaining <= expansion )
|
||||
return( 0 );
|
||||
|
||||
remaining -= expansion;
|
||||
if( remaining >= max_len )
|
||||
remaining = max_len;
|
||||
|
||||
return( (int) remaining );
|
||||
}
|
||||
|
||||
/*
|
||||
* Double the retransmit timeout value, within the allowed range,
|
||||
* returning -1 if the maximum value has already been reached.
|
||||
@ -2857,20 +2910,9 @@ int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
|
||||
*/
|
||||
int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
|
||||
{
|
||||
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_payload - 12;
|
||||
|
||||
int ret;
|
||||
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 flight transmission" ) );
|
||||
@ -2884,22 +2926,38 @@ int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
|
||||
|
||||
while( ssl->handshake->cur_msg != NULL )
|
||||
{
|
||||
int ret;
|
||||
size_t max_frag_len;
|
||||
const mbedtls_ssl_flight_item * const cur = ssl->handshake->cur_msg;
|
||||
|
||||
/* Swap epochs before sending Finished: we can't do it after
|
||||
* sending ChangeCipherSpec, in case write returns WANT_READ.
|
||||
* Must be done before copying, may change out_msg pointer */
|
||||
if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
||||
cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
|
||||
cur->p[0] == MBEDTLS_SSL_HS_FINISHED &&
|
||||
ssl->handshake->cur_msg_p == ( cur->p + 12 ) )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "swap epochs to send finished message" ) );
|
||||
ssl_swap_epochs( ssl );
|
||||
}
|
||||
|
||||
ret = ssl_get_remaining_payload_in_datagram( ssl );
|
||||
if( ret < 0 )
|
||||
return( ret );
|
||||
max_frag_len = (size_t) ret;
|
||||
|
||||
/* CCS is copied as is, while HS messages may need fragmentation */
|
||||
if( cur->type == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
|
||||
{
|
||||
if( max_frag_len == 0 )
|
||||
{
|
||||
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
||||
return( ret );
|
||||
|
||||
continue;
|
||||
}
|
||||
|
||||
memcpy( ssl->out_msg, cur->p, cur->len );
|
||||
ssl->out_msglen = cur->len;
|
||||
ssl->out_msglen = cur->len;
|
||||
ssl->out_msgtype = cur->type;
|
||||
|
||||
/* Update position inside current message */
|
||||
@ -2911,14 +2969,31 @@ int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
|
||||
const size_t hs_len = cur->len - 12;
|
||||
const size_t frag_off = p - ( cur->p + 12 );
|
||||
const size_t rem_len = hs_len - frag_off;
|
||||
const size_t frag_len = rem_len > max_hs_fragment_len
|
||||
? max_hs_fragment_len : rem_len;
|
||||
size_t cur_hs_frag_len, max_hs_frag_len;
|
||||
|
||||
if( frag_off == 0 && frag_len != hs_len )
|
||||
if( max_frag_len < 12 )
|
||||
{
|
||||
if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
|
||||
cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
|
||||
{
|
||||
ssl_swap_epochs( ssl );
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
||||
return( ret );
|
||||
|
||||
continue;
|
||||
}
|
||||
max_hs_frag_len = max_frag_len - 12;
|
||||
|
||||
cur_hs_frag_len = rem_len > max_hs_frag_len ?
|
||||
max_hs_frag_len : rem_len;
|
||||
|
||||
if( frag_off == 0 && cur_hs_frag_len != hs_len )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "fragmenting handshake message (%u > %u)",
|
||||
(unsigned) hs_len,
|
||||
(unsigned) max_hs_fragment_len ) );
|
||||
(unsigned) cur_hs_frag_len,
|
||||
(unsigned) max_hs_frag_len ) );
|
||||
}
|
||||
|
||||
/* Messages are stored with handshake headers as if not fragmented,
|
||||
@ -2930,19 +3005,19 @@ int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
|
||||
ssl->out_msg[7] = ( ( frag_off >> 8 ) & 0xff );
|
||||
ssl->out_msg[8] = ( ( frag_off ) & 0xff );
|
||||
|
||||
ssl->out_msg[ 9] = ( ( frag_len >> 16 ) & 0xff );
|
||||
ssl->out_msg[10] = ( ( frag_len >> 8 ) & 0xff );
|
||||
ssl->out_msg[11] = ( ( frag_len ) & 0xff );
|
||||
ssl->out_msg[ 9] = ( ( cur_hs_frag_len >> 16 ) & 0xff );
|
||||
ssl->out_msg[10] = ( ( cur_hs_frag_len >> 8 ) & 0xff );
|
||||
ssl->out_msg[11] = ( ( cur_hs_frag_len ) & 0xff );
|
||||
|
||||
MBEDTLS_SSL_DEBUG_BUF( 3, "handshake header", ssl->out_msg, 12 );
|
||||
|
||||
/* Copy the handshake message content and set records fields */
|
||||
memcpy( ssl->out_msg + 12, p, frag_len );
|
||||
ssl->out_msglen = frag_len + 12;
|
||||
/* Copy the handshame message content and set records fields */
|
||||
memcpy( ssl->out_msg + 12, p, cur_hs_frag_len );
|
||||
ssl->out_msglen = cur_hs_frag_len + 12;
|
||||
ssl->out_msgtype = cur->type;
|
||||
|
||||
/* Update position inside current message */
|
||||
ssl->handshake->cur_msg_p += frag_len;
|
||||
ssl->handshake->cur_msg_p += cur_hs_frag_len;
|
||||
}
|
||||
|
||||
/* If done with the current message move to the next one if any */
|
||||
@ -2961,13 +3036,17 @@ int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
|
||||
}
|
||||
|
||||
/* Actually send the message out */
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl,
|
||||
SSL_DONT_FORCE_FLUSH ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
||||
return( ret );
|
||||
}
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
||||
return( ret );
|
||||
|
||||
/* Update state and set timer */
|
||||
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
|
||||
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
|
||||
@ -3158,7 +3237,7 @@ int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl )
|
||||
else
|
||||
#endif
|
||||
{
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
||||
return( ret );
|
||||
@ -3182,10 +3261,11 @@ int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl )
|
||||
* - ssl->out_msglen: length of the record content (excl headers)
|
||||
* - ssl->out_msg: record content
|
||||
*/
|
||||
int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
|
||||
int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush )
|
||||
{
|
||||
int ret, done = 0;
|
||||
size_t len = ssl->out_msglen;
|
||||
uint8_t flush = force_flush;
|
||||
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
|
||||
|
||||
@ -3288,7 +3368,21 @@ int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
|
||||
}
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
||||
#if defined(MBEDTLS_SSL_PROTO_DTLS)
|
||||
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
|
||||
{
|
||||
size_t remaining = ssl_get_remaining_payload_in_datagram( ssl );
|
||||
if( remaining == 0 )
|
||||
flush = SSL_FORCE_FLUSH;
|
||||
else
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_MSG( 2, ( "Stil %u bytes available in current datagram", (unsigned) remaining ) );
|
||||
}
|
||||
}
|
||||
#endif /* MBEDTLS_SSL_PROTO_DTLS */
|
||||
|
||||
if( ( flush == SSL_FORCE_FLUSH ) &&
|
||||
( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
|
||||
return( ret );
|
||||
@ -4570,7 +4664,7 @@ int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
|
||||
ssl->out_msg[0] = level;
|
||||
ssl->out_msg[1] = message;
|
||||
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
||||
return( ret );
|
||||
@ -7815,7 +7909,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
|
||||
ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
|
||||
memcpy( ssl->out_msg, buf, len );
|
||||
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
|
||||
if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
|
||||
{
|
||||
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
|
||||
return( ret );
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user