On Linux, handle all CAN captures with pcap-linux.c, in cooked mode.

There's no need to support capturing on PF_CAN sockets; CAN interfaces
show up as regular interfaces on which you can capture with PF_PACKET
sockets, so just let pcap-linux.c handle them, and get rid of
pcap-can-linux.c.

Capture on them in cooked mode, so we get the protocol field and can
distinguish between "classic" CAN and CAN FD.

The hardware for which pcap-canusb-linux.c was intended never reached
production:

    https://github.com/axos88/libpcap/commit/f3edbb599b8cbcc7e4560000dcba8e992dc11a31#commitcomment-18716617

so we don't need pcap-canusb-linux.c, either.

This all removes the need for the "host-endian" link-layer header type;
it never made it into a libpcap release, so we just remove it.  The
"big-endian" link-layer header type is kept for the benefit of packets
captured with the old pcap-can-linux.c code; we revert it to its old
name.

1 files changed, 1 insertions, 2 deletions

diff --git a/gencode.c b/gencode.c
index d1326f70..b0cadc32 100644
--- a/gencode.c
+++ b/gencode.c
@@ -3397,8 +3397,7 @@ gen_linktype(compiler_state_t *cstate, int proto)
 		bpf_error(cstate, "Bluetooth link-layer type filtering not implemented");
 
 	case DLT_CAN20B:
-	case DLT_CAN_SOCKETCAN_BIGENDIAN:
-	case DLT_CAN_SOCKETCAN_HOSTENDIAN:
+	case DLT_CAN_SOCKETCAN:
 		bpf_error(cstate, "CAN link-layer type filtering not implemented");
 
 	case DLT_IEEE802_15_4: