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xfrm: Don't allow esn with disabled anti replay detection

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Unlike the standard case, disabled anti replay detection needs some
nontrivial extra treatment on ESN. RFC 4303 states:

Note: If a receiver chooses to not enable anti-replay for an SA, then
the receiver SHOULD NOT negotiate ESN in an SA management protocol.
Use of ESN creates a need for the receiver to manage the anti-replay
window (in order to determine the correct value for the high-order
bits of the ESN, which are employed in the ICV computation), which is
generally contrary to the notion of disabling anti-replay for an SA.

So return an error if an ESN state with disabled anti replay detection
is inserted for now and add the extra treatment later if we need it.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2011-05-09 19:43:05 +00:00 committed by David S. Miller
parent 43a4dea4c9
commit 6fa5ddcc67
1 changed files with 3 additions and 0 deletions
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3
net/xfrm/xfrm_replay.c
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@ -535,6 +535,9 @@ int xfrm_init_replay(struct xfrm_state *x)
replay_esn->bmp_len * sizeof(__u32) * 8)
return -EINVAL;
if ((x->props.flags & XFRM_STATE_ESN) && replay_esn->replay_window == 0)
return -EINVAL;
if ((x->props.flags & XFRM_STATE_ESN) && x->replay_esn)
x->repl = &xfrm_replay_esn;
else