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altcp_mbedtls: added altcp_mbedtls_sndbuf implementation

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Signed-off-by: goldsimon <goldsimon@gmx.de>
This commit is contained in:
David Girault 2018-01-11 10:34:55 +01:00 committed by goldsimon
parent eab1b45cba
commit 6ccd12b97c
1 changed files with 56 additions and 1 deletions
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57
src/apps/altcp_tls/altcp_tls_mbedtls.c
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@ -92,6 +92,21 @@
#define ALTCP_MBEDTLS_ENTROPY_LEN 0
#endif
/** Define this to whatever overhead is suitable.
* Defaults to take care of record header, IV, AuthTag.
* The last '+16' is for alignment & security.
*/
#ifndef ALTCP_MBEDTLS_SNDBUF_OVERHEAD
#define ALTCP_MBEDTLS_SNDBUF_OVERHEAD (5 + 8 + 16 + (MEM_ALIGNMENT - 1) + 16)
#endif
/** When this is 1 and ALTCP_MBEDTLS_SNDBUF_OVERHEAD==1, the sndbuf
* is limited to the (negotiated) maximum fragment length.
*/
#ifndef ALTCP_MBEDTLS_SNDBUF_OVERHEAD_LIMIT_TO_MAX_FRAG_LEN
#define ALTCP_MBEDTLS_SNDBUF_OVERHEAD_LIMIT_TO_MAX_FRAG_LEN 1
#endif
/* Variable prototype, the actual declaration is at the end of this file
since it contains pointers to static functions declared here */
extern const struct altcp_functions altcp_mbedtls_functions;
@ -888,6 +903,46 @@ altcp_mbedtls_close(struct altcp_pcb *conn)
return ERR_OK;
}
/** Allow caller of altcp_write() to limit to negotiated chunk size
* or remaining sndbuf space of inner_conn.
*/
static u16_t
altcp_mbedtls_sndbuf(struct altcp_pcb *conn)
{
/* Take care of record header, IV, AuthTag */
#if ALTCP_MBEDTLS_SNDBUF_OVERHEAD
size_t ssl_added = ALTCP_MBEDTLS_SNDBUF_OVERHEAD;
if (conn) {
altcp_mbedtls_state_t *state;
state = (altcp_mbedtls_state_t*)conn->state;
if (!state || !(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
return 0;
}
if (conn->inner_conn) {
u16_t sndbuf = altcp_sndbuf(conn->inner_conn);
/* internal sndbuf smaller than our offset */
if (ssl_added < sndbuf) {
size_t max_len = 0xFFFF;
size_t ret;
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && ALTCP_MBEDTLS_SNDBUF_OVERHEAD_LIMIT_TO_MAX_FRAG_LEN
/* @todo: adjust ssl_added to real value related to negociated cipher */
size_t max_frag_len = mbedtls_ssl_get_max_frag_len(&state->ssl_context);
max_len = LWIP_MIN(max_frag_len, max_len);
#endif
/* Adjust sndbuf of inner_conn with what added by SSL */
ret = LWIP_MIN(sndbuf - ssl_added, max_len);
LWIP_ASSERT("sndbuf overflow", ret <= 0xFFFF);
return (u16_t)ret;
}
}
}
return 0;
#else /* ALTCP_MBEDTLS_SNDBUF_OVERHEAD */
return altcp_default_sndbuf(conn);
#endif
}
/** Write data to a TLS connection. Calls into mbedTLS, which in turn calls into
* @ref altcp_mbedtls_bio_send() to send the encrypted data
*/
@ -1018,7 +1073,7 @@ const struct altcp_functions altcp_mbedtls_functions = {
altcp_mbedtls_write,
altcp_default_output,
altcp_mbedtls_mss,
altcp_default_sndbuf,
altcp_mbedtls_sndbuf,
altcp_default_sndqueuelen,
altcp_default_nagle_disable,
altcp_default_nagle_enable,