Presumably aligned(8) means "align on an 8-byte boundary"; if canid_t
is a 32-bit quantity, then there should be 3 bytes of padding on *all*
platforms.
However, if you're using DLT_CAN20B, what matters here is what
*existing* software that uses DLT_CAN20B expects; you would have to
arrange to make the frame look like that, regardless of whether it
matches "struct can_frame" or not, or you would have to request a
different DLT_ value, e.g. DLT_CAN20B_LINUX or DLT_CAN20B_SOCKETCAN or
something such as that.
Gianluca, what does the header look like in a DLT_CAN20B packet?
The spec is here
http://www.winpcap.org/gianluca/can.html
Have a nice day
GV
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