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DTLS Multicast

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1. Add configured group ID to outbound DTLS datagrams.
2. Parse the group ID from inbound DTLS datagrams.
This commit is contained in:
John Safranek
2016-12-20 16:16:50 -08:00
parent dd9800856d
commit 41638b437b
2 changed files with 41 additions and 8 deletions
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45
src/internal.c
View File

@@ -4906,18 +4906,42 @@ static INLINE void DtlsGetSEQ(WOLFSSL* ssl, int order, word32 seq[2])
{
if (order == PREV_ORDER) {
/* Previous epoch case */
seq[0] = ((ssl->keys.dtls_epoch - 1) << 16) |
(ssl->keys.dtls_prev_sequence_number_hi & 0xFFFF);
if (ssl->options.haveMcast) {
#ifdef WOLFSSL_MULTICAST
seq[0] = ((ssl->keys.dtls_epoch - 1) << 16) |
(ssl->options.mcastID << 8) |
(ssl->keys.dtls_prev_sequence_number_hi & 0xFF);
#endif
}
else
seq[0] = ((ssl->keys.dtls_epoch - 1) << 16) |
(ssl->keys.dtls_prev_sequence_number_hi & 0xFFFF);
seq[1] = ssl->keys.dtls_prev_sequence_number_lo;
}
else if (order == PEER_ORDER) {
seq[0] = (ssl->keys.curEpoch << 16) |
(ssl->keys.curSeq_hi & 0xFFFF);
if (ssl->options.haveMcast) {
#ifdef WOLFSSL_MULTICAST
seq[0] = (ssl->keys.curEpoch << 16) |
(ssl->keys.curPeerId << 8) |
(ssl->keys.curSeq_hi & 0xFF);
#endif
}
else
seq[0] = (ssl->keys.curEpoch << 16) |
(ssl->keys.curSeq_hi & 0xFFFF);
seq[1] = ssl->keys.curSeq_lo; /* explicit from peer */
}
else {
seq[0] = (ssl->keys.dtls_epoch << 16) |
(ssl->keys.dtls_sequence_number_hi & 0xFFFF);
if (ssl->options.haveMcast) {
#ifdef WOLFSSL_MULTICAST
seq[0] = (ssl->keys.dtls_epoch << 16) |
(ssl->options.mcastID << 8) |
(ssl->keys.dtls_sequence_number_hi & 0xFF);
#endif
}
else
seq[0] = (ssl->keys.dtls_epoch << 16) |
(ssl->keys.dtls_sequence_number_hi & 0xFFFF);
seq[1] = ssl->keys.dtls_sequence_number_lo;
}
}
@@ -6217,7 +6241,14 @@ static int GetRecordHeader(WOLFSSL* ssl, const byte* input, word32* inOutIdx,
*inOutIdx += ENUM_LEN + VERSION_SZ;
ato16(input + *inOutIdx, &ssl->keys.curEpoch);
*inOutIdx += OPAQUE16_LEN;
ato16(input + *inOutIdx, &ssl->keys.curSeq_hi);
if (ssl->options.haveMcast) {
#ifdef WOLFSSL_MULTICAST
ssl->keys.curPeerId = input[*inOutIdx];
ssl->keys.curSeq_hi = input[*inOutIdx+1];
#endif
}
else
ato16(input + *inOutIdx, &ssl->keys.curSeq_hi);
*inOutIdx += OPAQUE16_LEN;
ato32(input + *inOutIdx, &ssl->keys.curSeq_lo);
*inOutIdx += OPAQUE32_LEN; /* advance past rest of seq */

4
wolfssl/internal.h
View File

@@ -1756,6 +1756,9 @@ typedef struct Keys {
word16 curEpoch; /* Received epoch in current record */
word16 curSeq_hi; /* Received sequence in current record */
word32 curSeq_lo;
#ifdef WOLFSSL_MULTICAST
byte curPeerId; /* Received peer group ID in current record */
#endif
word32 prevWindow[WOLFSSL_DTLS_WINDOW_WORDS];
/* Sliding window for old epoch */
@@ -2846,7 +2849,6 @@ typedef struct Options {
word16 dtlsSctp:1; /* DTLS-over-SCTP mode */
#endif
#endif
#ifdef WOLFSSL_MULTICAST
word16 haveMcast:1; /* using multicast ? */
#endif
word16 haveEMS:1; /* using extended master secret */