ifa_list member of in_device structure

[sun <sun@phear.org>]

Hi!
I know I'm probably being lazy or ignorant. But I'm a kernelnewbie.
I've been looking at some sourcecode, and I was wondering why have 
a member of in_device, ifa_list, which is a linked list of network
parameters.
I thought at first they might be aliases, but don't aliases get their
own net_device structure etc?

Thanks in advance for your help.
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