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Make mbedtls_ssl_in_hdr_len() CID-unaware

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The function mbedtls_ssl_in_hdr_len() is supposed to return the length
of the record header of the current incoming record. With the advent
of the DTLS Connection ID, this length is only known at runtime and
hence so far needed to be derived from the internal in_iv pointer
pointing to the beginning of the payload of the current incooing
record.

By now, however, those uses of mbedtls_ssl_in_hdr_len() where the
presence of a CID would need to be detected have been removed
(specifically, ssl_parse_record_header() doesn't use it anymore
when checking that the current datagram is large enough to hold
the record header, including the CID), and it's sufficient to
statically return the default record header sizes of 5 / 13 Bytes
for TLS / DTLS.
This commit is contained in:
Hanno Becker 2019-07-12 09:55:46 +01:00 committed by Manuel Pégourié-Gonnard
parent 05413d9041
commit f903dc8354
1 changed files with 16 additions and 1 deletions
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17
include/mbedtls/ssl_internal.h
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@ -1073,7 +1073,22 @@ int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
static inline size_t mbedtls_ssl_in_hdr_len( const mbedtls_ssl_context *ssl )
{
return( (size_t) ( ssl->in_iv - ssl->in_hdr ) );
#if !defined(MBEDTLS_SSL_PROTO__BOTH)
((void) ssl);
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( MBEDTLS_SSL_TRANSPORT_IS_DTLS( ssl->conf->transport ) )
{
return( 13 );
}
MBEDTLS_SSL_TRANSPORT_ELSE
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_PROTO_TLS)
{
return( 5 );
}
#endif /* MBEDTLS_SSL_PROTO_TLS */
}
static inline size_t mbedtls_ssl_out_hdr_len( const mbedtls_ssl_context *ssl )