tipc: eliminate buffer cloning in function tipc_msg_extract()

The function tipc_msg_extract() is using skb_clone() to clone inner
messages from a message bundle buffer. Although this method is safe,
it has an undesired effect that each buffer clone inherits the
true-size of the bundling buffer. As a result, the buffer clone
almost always ends up with being copied anyway by the message
validation function. This makes the cloning into a sub-optimization.

In this commit we take the consequence of this realization, and copy
each inner message to a separately allocated buffer up front in the
extraction function.

As a bonus we can now eliminate the two cases where we had to copy
re-routed packets that may potentially go out on the wire again.

Signed-off-by: Tung Nguyen <[email protected]>
Signed-off-by: Jon Maloy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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