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SubjectRe: linux/net/packet/af_packet.c and PF_PACKET/SOCK_PACKET

> There is no difference between SOCK_DGRAM and SOCK_RAW in PF_PACKET.

No, there is large difference between SOCK_RAW and SOCK_DGRAM
for packet socket.

SOCK_DGRAM sends/receive only network payload with
MAC headers stripped/added in the kernel.

SOCK_RAW tries to make best efforts to send/receive true raw data.

Generally, 90% of our drivers are broken and do not give
enough information (or give wrong information) to use SOCK_RAW unambiguously,
so that SOCK_DGRAM should be used always when it is possible.


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