change TOS explicitly for egress packets on specified network interface

[gshan]

Hi All,

I want to control TOS for egress packets of specified network interface, 
so I introduced "unsigned long tos" to
struct net_device::priv and it could be set through ioctl interface of 
ethernet driver.

But I don't know where to change TOS for egress packets because:
1) It seems TOS is used for route select now;
2) struct inet_sock has already included one "tos" field inside and it 
couldn't be set inside ethernet driver;

Thanks,
Gavin
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