The phyter offers one step sync transmission, but it alters the UDP
checksum by changing the last two bytes, after the PTP payload. While this
is only standardized for IPv6, we will go with it for IPv4 as well, since
the phyter is the only hardware out there.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
It is safer and more correct to clear the addresses before use. The IPv6
fields flowinfo and scope_id in particular should not be set to random
values from the stack.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
It was a cute idea to have the raw Ethernet layer use just one socket,
but it ended up not working on some specific PTP time stamping hardware.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Although the UDP/IPv4 layer does not need any state per instance (other
than the two file descriptors), the raw Ethernet layer will need this.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
If the networking stack fails to provide a transmit time stamp, then we
might feed uninitialized stack data to the CMSG(3) macros. This can result
in a segfault or other badness.
The fix is to simply clear the control buffer in advance.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Commit 32133050 introduced a bug that gives a bogus error message on
every 'general' (non-event) PTP packet. If we want to catch missing
time stamps, then it has to occur at the port level.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Without this Linux specific option, multicast packets arrive on one
interface are delivered by the kernel to all others.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
For some reason, MCAST_JOIN_GROUP is not working under uClinux. We can
just stick with the more traditional method.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Even though the MCAST_JOIN_GROUP socket option includes the interface
index, this applies to the received packets only. To bind the outgoing
packets to a particular interface, the IP_MULTICAST_IF option is needed.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Geoff Salmon
Richard Cochran