Commit cd808fc9 authored by Thomas Egerer's avatar Thomas Egerer Committed by Steffen Klassert
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xfrm: Fix aevent generation for each received packet 



If asynchronous events are enabled for a particular netlink socket,
the notify function is called by the advance function. The notify
function creates and dispatches a km_event if a replay timeout occurred,
or at least replay_maxdiff packets have been received since the last
asynchronous event has been sent. The function is supposed to return if
neither of the two events were detected for a state, or replay_maxdiff
is equal to zero.
Replay_maxdiff is initialized in xfrm_state_construct to the value of
the xfrm.sysctl_aevent_rseqth (2 by default), and updated if for a state
if the netlink attribute XFRMA_REPLAY_THRESH is set.
If, however, replay_maxdiff is set to zero, then all of the three notify
implementations perform a break from the switch statement instead of
checking whether a timeout occurred, and -- if not -- return.  As a
result an asynchronous event is generated for every replay update of a
state that has a zero replay_maxdiff value.
This patch modifies the notify functions such that they immediately
return if replay_maxdiff has the value zero, unless a timeout occurred.

Signed-off-by: default avatarThomas Egerer <thomas.egerer@secunet.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 33fce60d

net/xfrm/xfrm_replay.c

+27 −24
Original line number Diff line number Diff line
@@ -61,9 +61,9 @@ static void xfrm_replay_notify(struct xfrm_state *x, int event) 


	switch (event) {

	case XFRM_REPLAY_UPDATE:

		if (x->replay_maxdiff &&

		    (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&

		    (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {

		if (!x->replay_maxdiff ||

		    ((x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&

		    (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))) {

			if (x->xflags & XFRM_TIME_DEFER)

				event = XFRM_REPLAY_TIMEOUT;

			else
@@ -301,9 +301,10 @@ static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event) 


	switch (event) {

	case XFRM_REPLAY_UPDATE:

		if (x->replay_maxdiff &&

		    (replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) &&

		    (replay_esn->oseq - preplay_esn->oseq < x->replay_maxdiff)) {

		if (!x->replay_maxdiff ||

		    ((replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) &&

		    (replay_esn->oseq - preplay_esn->oseq

		     < x->replay_maxdiff))) {

			if (x->xflags & XFRM_TIME_DEFER)

				event = XFRM_REPLAY_TIMEOUT;

			else
@@ -352,27 +353,29 @@ static void xfrm_replay_notify_esn(struct xfrm_state *x, int event) 


	switch (event) {

	case XFRM_REPLAY_UPDATE:

		if (!x->replay_maxdiff)

			break;



		if (x->replay_maxdiff) {

			if (replay_esn->seq_hi == preplay_esn->seq_hi)

				seq_diff = replay_esn->seq - preplay_esn->seq;

			else

			seq_diff = ~preplay_esn->seq + replay_esn->seq + 1;

				seq_diff = ~preplay_esn->seq + replay_esn->seq

					   + 1;



			if (replay_esn->oseq_hi == preplay_esn->oseq_hi)

			oseq_diff = replay_esn->oseq - preplay_esn->oseq;

				oseq_diff = replay_esn->oseq

					    - preplay_esn->oseq;

			else

			oseq_diff = ~preplay_esn->oseq + replay_esn->oseq + 1;

				oseq_diff = ~preplay_esn->oseq

					    + replay_esn->oseq + 1;



		if (seq_diff < x->replay_maxdiff &&

		    oseq_diff < x->replay_maxdiff) {

			if (seq_diff >= x->replay_maxdiff ||

			    oseq_diff >= x->replay_maxdiff)

				break;

		}



		if (x->xflags & XFRM_TIME_DEFER)

			event = XFRM_REPLAY_TIMEOUT;

		else

			return;

		}



		break;

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