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Introduce buffering structure for handshake messages

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This commit introduces, but does not yet put to use, a sub-structure
of mbedtls_ssl_handshake_params::buffering that will be used for the
buffering and/or reassembly of handshake messages with handshake
sequence numbers that are greater or equal to the next expected
sequence number.
This commit is contained in:
Hanno Becker 2018-08-16 13:23:47 +01:00
parent d7f8ae2508
commit 0271f967d6
2 changed files with 68 additions and 3 deletions
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13
include/mbedtls/ssl_internal.h
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@ -155,6 +155,9 @@
#define MBEDTLS_SSL_OUT_PAYLOAD_LEN ( MBEDTLS_SSL_PAYLOAD_OVERHEAD + \
( MBEDTLS_SSL_OUT_CONTENT_LEN ) )
/* The maximum number of buffered handshake messages. */
#define MBEDTLS_SSL_MAX_BUFFERED_HS 2
/* Maximum length we can advertise as our max content length for
RFC 6066 max_fragment_length extension negotiation purposes
(the lesser of both sizes, if they are unequal.)
@ -313,6 +316,14 @@ struct mbedtls_ssl_handshake_params
uint8_t seen_ccs; /*!< Indicates if a CCS message has
* been seen in the current flight. */
struct mbedtls_ssl_hs_buffer
{
uint8_t is_valid : 1;
uint8_t is_fragmented : 1;
uint8_t is_complete : 1;
unsigned char *data;
} hs[MBEDTLS_SSL_MAX_BUFFERED_HS];
} buffering;
#endif /* MBEDTLS_SSL_PROTO_DTLS */
@ -372,6 +383,8 @@ struct mbedtls_ssl_handshake_params
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
};
typedef struct mbedtls_ssl_hs_buffer mbedtls_ssl_hs_buffer;
/*
* This structure contains a full set of runtime transform parameters
* either in negotiation or active.