Re: [RTnet-developers] Socket RAW

[Jan K. <jan...@we...>]

Jorge Almeida wrote:
> Jan,
>=20

[Even /me is sometimes busy - not with answering mails. ;)]

>=20
> I've looked in the af_packet.c file and i arrive to some conclusions fo=
r the RAW packet implementation, but i have some doubts regardind the rts=
kb struct.
>=20
> Especialy in:
>=20
> rtsckb.h - line 194
>     /* link layer */
>     union
>     {
>         struct ethhdr   *ethernet;
>         unsigned char   *raw;
>     } mac;
>=20
> i know that  "struct ethhdr   *ethernet; " keeps the source and destina=
tion mac address of the frame, but wath values "unsigned char   *raw;" ca=
n have?

It's a union, so you could also address the MAC as plain bytes this way.

>=20
>=20
> And another question,
> Does not existe any field in the rtskb struct that has all the Ethernet=
 frame inside (Destination Address, Source Address, Protocol, Data)? In t=
he driver everything is divided right?

mac.raw?

>=20
>=20
> One thing that i'm thinking is reconstruct a buffer with all this infor=
mation and return it to the user. This way the user has all the Ethernet =
frame in user space and can do anything he wants.

Please don't invent something new. Try to follow the existing
interfaces, maybe only skipping (yet) unneeded features.

Jan