Implement support for MTU setting
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0b1d9b2c75
commit
9468ff1966
2 changed files with 92 additions and 20 deletions
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@ -2430,6 +2430,7 @@ void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
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#if defined(MBEDTLS_SSL_PROTO_DTLS)
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/**
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* \brief Set the Maximum Tranport Unit (MTU).
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* Special value: 0 means unset (no limit).
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* This represents the maximum size of a datagram payload
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* handled by the transport layer (usually UDP) as determined
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* by the network link and stack. In practice, this controls
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@ -2446,7 +2447,8 @@ void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
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*
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* \note Values larger than \c MBEDTLS_SSL_OUT_CONTENT_LEN have no
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* effect. This can only be used to decrease the maximum size
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* of detagrams sent.
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* of datagrams sent. Values lower than record layer expansion
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* are ignored.
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*
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* \param conf SSL configuration
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* \param mtu Value of the path MTU in bytes
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@ -2738,6 +2740,9 @@ const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl );
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* \brief Return the (maximum) number of bytes added by the record
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* layer: header + encryption/MAC overhead (inc. padding)
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*
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* \note This function is not available (always returns an error)
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* when record compression is enabled.
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*
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* \param ssl SSL context
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*
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* \return Current maximum record expansion in bytes, or
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@ -2752,12 +2757,8 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl );
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* This is the value negotiated with peer if any,
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* or the locally configured value.
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*
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* \note With DTLS, \c mbedtls_ssl_write() will return an error if
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* called with a larger length value.
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* With TLS, \c mbedtls_ssl_write() will fragment the input if
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* necessary and return the number of bytes written; it is up
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* to the caller to call \c mbedtls_ssl_write() again in
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* order to send the remaining bytes if any.
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* \sa mbedtls_ssl_conf_max_frag_len()
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* \sa mbedtls_ssl_get_max_record_payload()
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*
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* \param ssl SSL context
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*
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@ -2766,6 +2767,34 @@ int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl );
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size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl );
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#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
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/**
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* \brief Return the current maximum outgoing record payload in bytes.
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* This takes into account the config.h setting \c
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* MBEDTLS_SSL_OUT_CONTENT_LEN, the configured and negotiated
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* max fragment length extension if used, and for DTLS the
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* path MTU as configured and current record expansion.
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*
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* \note With DTLS, \c mbedtls_ssl_write() will return an error if
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* called with a larger length value.
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* With TLS, \c mbedtls_ssl_write() will fragment the input if
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* necessary and return the number of bytes written; it is up
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* to the caller to call \c mbedtls_ssl_write() again in
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* order to send the remaining bytes if any.
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*
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* \note This function is not available (always returns an error)
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* when record compression is enabled.
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*
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* \sa mbedtls_ssl_conf_mtu()
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* \sa mbedtls_ssl_get_max_frag_len()
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* \sa mbedtls_ssl_get_record_expansion()
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*
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* \param ssl SSL context
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*
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* \return Current maximum payload for an outgoing record,
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* or a negative error code.
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*/
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int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl );
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#if defined(MBEDTLS_X509_CRT_PARSE_C)
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/**
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* \brief Return the peer certificate from the current connection
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