[support] NEPL Tunnel ID

[Ben McCarthy]

Hi all,

 

I had a problem quite a while ago where I needed to identify which MRs
tunnel a packet had been sent via. So if a HA has 10 connected and active
MRs I need the HA to be able to determine which MR-HA tunnel a packet
(specifically a BU) was sent down. Unfortunately due to the nature of what
I'm doing (MANEMO) I can't simply identify which tunnel a packet was sent
down based on address, so I came up with a intermediary solution where I
appended information to a BU that allowed me to identify the tunnel in user
space after it had been delivered. Unfortunately as the scenarios I am
supporting have become more complex I have come across a flaw in this
intermediary approach. Ideally it would be perfect if I could receive a BU
and read some netlink variable from user space that identifies which tunnel
it arrived via. but nothing is ever that simple and I think I determined
that wasn't possible the last time I looked at this.

 

So does anyone know if this would be possible from within the kernel (by
hacking the v6 tunnel interface code a little?) and maybe have any hints how
I might best go about achieving this?

 

Cheers,

 

Ben   

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