All ACKs without data must be built in the same way from the input
message:
<SN=received AN><AN=received SN+1 modulo 2><CTL=ACK>
The code was actually doing this instead:
<SN=0><AN=SN><CTL=ACK>
Signed-off-by: Aleksander Morgado <aleksan...@aleksander.es>
---
lib/ratp.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/lib/ratp.c b/lib/ratp.c
index 321721ab7..5c52d3b5f 100644
--- a/lib/ratp.c
+++ b/lib/ratp.c
@@ -364,13 +364,12 @@ static bool ratp_sn_expected(struct ratp_internal *ri,
struct ratp_header *hdr)
static int ratp_send_ack(struct ratp_internal *ri, struct ratp_header *hdr)
{
- uint8_t control = RATP_CONTROL_ACK;
+ uint8_t control;
int ret;
- if (hdr->control & RATP_CONTROL_SN)
- control |= RATP_CONTROL_AN;
- else
- control |= 0;
+ control = ratp_set_sn(ratp_an(hdr)) |
+ ratp_set_an(ratp_sn(hdr) + 1) |
+ RATP_CONTROL_ACK;
ret = ratp_send_hdr(ri, control);
if (ret)
--
2.13.1
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