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From: Ihsan Junaidi Ibrahim <ihsan@grep.my>
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Subject: getifaddrs() gif tunnel src/dst address
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Date: Sun, 17 Feb 2013 23:51:35 +0800
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Hi,

I've been trying to obtain gif tunnel addresses via getifaddrs() but =
I've not been able to. The tunnel addresses can be inet/inet6 depending =
on the scenario.

I can however get the inet/inet6 address of the interface.

Is there a way to get them?

Also looking at if_gif.c, I notice that there's the following ioctl =
flags:
- SIOCGLIFPHYADDR
- SIOCGIFPSRCADDR(_IN6)/SIOCGIFPDSTADDR(_IN6)
- SIOCGIFPHYADDR/SIOCIFPHYADDR_IN6

that I can use to get the addresses however due to my limited knowledge, =
I can't seem to figure them out.

I believe getifaddrs() invoke one of these flags to return the =
inet/inet6 address of the interface when the sa_family refers to =
AF_INET/AF_INET6.

I've tried matching AF_LINK and managed to match sockaddr_dl.sdl_type =
with IFT_GIF but I'm not sure where the tunnel addresses are stored on =
that structure.

I'm hoping for the collective wisdom to assist me here.

Thanks.=