Hi,
I have a situation where I want to record which interface (say eth2) was
used for a packet (say the current packet). Later I want to be able to send
other packets over the interface which I recorded if it is up and able to
send packets.
What would be the best way to keep track of an interface for the above
scenario? Could we use the "struct net_device" pointer to the interface? If
we kept track of "struct net_device" pointer, and later that interface
flapped, the pointer would no longer be valid (I assume so). Then how should
do we detect that?
One way I thought was that we keep track of the "oif" (in "struct fib_nh")
for the particular device. Is it guaranteed that the same device will always
have the same "oif" even if it flapped? If so, it would be a simple matter to
record the "oif" number of the device and later send the packets on that
interface after checking that the interface is up and able to send packets.
The broader aim is to route packets of a connection over the same
interface, like routing all packets of the same TCP session over the same
interface.
Thanks,
Ashok
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