> How can I pass raw Wifi Headers to pcap. In mac, the wifi headers are
> converted into ethernet headers and passed on to upper layers. How can
> I bypass that?
The DLIOCNATIVE ioctl will switch the DLPI data stream into native mode.
>From dlpi(7P):
Native Mode
Some DLPI providers are able to represent their link
layer using more than one link-layer format. In this
case, the default link-layer format can minimize impact
to applications, but might not allow truly native link-
layer headers to be sent or received. DLPI consumers who
wish to use the native link-layer format can use DLIOC-
NATIVE to transition the stream. DLIOCNATIVE takes no
arguments and returns the DLPI mac type associated with
the new link-layer format upon success. Once
enabled, the stream remains in this mode until closed.
Note that DLIOCNATIVE does not enable transition
between dissimilar DLPI mac types and (aside from the
link-layer format), the new DLPI mac type is
guaranteed to be semantically identical. In particular,
the SAP space and addressing format are not affected and
the effect of DLIOCNATIVE is only visible when in raw
mode, though any subsequent DL_INFO_REQ requests gen-
erate responses with dl_mac_type set to the native DLPI
type.
--
meem
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