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DTLS Message Grouping

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Flush output buffer when we suspect that the grouped messages may exceed MTU.
This commit is contained in:
Juliusz Sosinowicz
2020-05-25 23:35:42 +02:00
committed by Unknown
parent d2542dcf38
commit 4e60e4b3b7
1 changed files with 27 additions and 12 deletions
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39
src/internal.c
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@@ -7317,10 +7317,11 @@ int DtlsMsgPoolSend(WOLFSSL* ssl, int sendOnlyFirstPacket)
return ret;
}
XMEMCPY(ssl->buffers.outputBuffer.buffer,
XMEMCPY(ssl->buffers.outputBuffer.buffer +
ssl->buffers.outputBuffer.idx +
ssl->buffers.outputBuffer.length,
pool->buf, pool->sz);
ssl->buffers.outputBuffer.idx = 0;
ssl->buffers.outputBuffer.length = pool->sz;
ssl->buffers.outputBuffer.length += pool->sz;
}
else {
/* Handle sending packets from previous epoch */
@@ -7377,11 +7378,9 @@ int DtlsMsgPoolSend(WOLFSSL* ssl, int sendOnlyFirstPacket)
ssl->buffers.outputBuffer.length += sendSz;
}
ret = SendBuffered(ssl);
if (ret < 0) {
WOLFSSL_ERROR(ret);
return ret;
}
if (!ssl->options.groupMessages)
ret = SendBuffered(ssl);
/**
* on server side, retransmission is being triggered only by sending
@@ -7392,14 +7391,15 @@ int DtlsMsgPoolSend(WOLFSSL* ssl, int sendOnlyFirstPacket)
* be enough to do the trick.
*/
if (sendOnlyFirstPacket &&
ssl->options.side == WOLFSSL_SERVER_END) {
ssl->options.side == WOLFSSL_SERVER_END)
pool = NULL;
}
else
pool = pool->next;
ssl->dtls_tx_msg = pool;
}
if (ret == 0 && ssl->options.groupMessages)
ret = SendBuffered(ssl);
}
WOLFSSL_LEAVE("DtlsMsgPoolSend()", ret);
@@ -8339,7 +8339,10 @@ int GrowInputBuffer(WOLFSSL* ssl, int size, int usedLength)
}
/* check available size into output buffer, make room if needed */
/* Check available size into output buffer, make room if needed.
* This function needs to be called before anything gets put
* into the output buffers since it flushes pending data if it
* predicts that the msg will exceed MTU. */
int CheckAvailableSize(WOLFSSL *ssl, int size)
{
if (size < 0) {
@@ -8347,6 +8350,18 @@ int CheckAvailableSize(WOLFSSL *ssl, int size)
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_DTLS
if (size + ssl->buffers.outputBuffer.length - ssl->buffers.outputBuffer.idx
> ssl->dtls_expected_rx) {
int ret;
WOLFSSL_MSG("CheckAvailableSize() flushing buffer "
"to make room for new message");
if ((ret = SendBuffered(ssl)) != 0) {
return ret;
}
}
#endif
if (ssl->buffers.outputBuffer.bufferSize - ssl->buffers.outputBuffer.length
< (word32)size) {
if (GrowOutputBuffer(ssl, size) < 0)