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Commit 1d974374 authored by Steffen Klassert's avatar Steffen Klassert Committed by David S. Miller
Browse files

xfrm: Simplify the replay check and advance functions 



The replay check and replay advance functions had some code
duplications. This patch removes the duplications.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a4886d52

net/xfrm/xfrm_replay.c

+34 −64
Original line number Diff line number Diff line
@@ -203,8 +203,6 @@ static int xfrm_replay_check_bmp(struct xfrm_state *x, 
	if (!replay_esn->replay_window)

		return 0;



	pos = (replay_esn->seq - 1) % replay_esn->replay_window;



	if (unlikely(seq == 0))

		goto err;
@@ -216,19 +214,18 @@ static int xfrm_replay_check_bmp(struct xfrm_state *x, 
		goto err;

	}



	if (pos >= diff) {

	pos = (replay_esn->seq - 1) % replay_esn->replay_window;



	if (pos >= diff)

		bitnr = (pos - diff) % replay_esn->replay_window;

		nr = bitnr >> 5;

		bitnr = bitnr & 0x1F;

		if (replay_esn->bmp[nr] & (1U << bitnr))

			goto err_replay;

	} else {

	else

		bitnr = replay_esn->replay_window - (diff - pos);



	nr = bitnr >> 5;

	bitnr = bitnr & 0x1F;

	if (replay_esn->bmp[nr] & (1U << bitnr))

		goto err_replay;

	}



	return 0;



err_replay:
@@ -259,38 +256,26 @@ static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq) 
				bitnr = bitnr & 0x1F;

				replay_esn->bmp[nr] &=  ~(1U << bitnr);

			}



			bitnr = (pos + diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		} else {

			nr = (replay_esn->replay_window - 1) >> 5;

			for (i = 0; i <= nr; i++)

				replay_esn->bmp[i] = 0;



			bitnr = (pos + diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		}



		bitnr = (pos + diff) % replay_esn->replay_window;

		replay_esn->seq = seq;

	} else {

		diff = replay_esn->seq - seq;



		if (pos >= diff) {

		if (pos >= diff)

			bitnr = (pos - diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		} else {

		else

			bitnr = replay_esn->replay_window - (diff - pos);

	}



	nr = bitnr >> 5;

	bitnr = bitnr & 0x1F;

	replay_esn->bmp[nr] |= (1U << bitnr);

		}

	}



	if (xfrm_aevent_is_on(xs_net(x)))

		xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
@@ -390,8 +375,6 @@ static int xfrm_replay_check_esn(struct xfrm_state *x, 
	if (!wsize)

		return 0;



	pos = (replay_esn->seq - 1) % replay_esn->replay_window;



	if (unlikely(seq == 0 && replay_esn->seq_hi == 0 &&

		     (replay_esn->seq < replay_esn->replay_window - 1)))

		goto err;
@@ -415,19 +398,18 @@ static int xfrm_replay_check_esn(struct xfrm_state *x, 
		goto err;

	}



	if (pos >= diff) {

	pos = (replay_esn->seq - 1) % replay_esn->replay_window;



	if (pos >= diff)

		bitnr = (pos - diff) % replay_esn->replay_window;

		nr = bitnr >> 5;

		bitnr = bitnr & 0x1F;

		if (replay_esn->bmp[nr] & (1U << bitnr))

			goto err_replay;

	} else {

	else

		bitnr = replay_esn->replay_window - (diff - pos);



	nr = bitnr >> 5;

	bitnr = bitnr & 0x1F;

	if (replay_esn->bmp[nr] & (1U << bitnr))

		goto err_replay;

	}



	return 0;



err_replay:
@@ -465,22 +447,13 @@ static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) 
				bitnr = bitnr & 0x1F;

				replay_esn->bmp[nr] &=  ~(1U << bitnr);

			}



			bitnr = (pos + diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		} else {

			nr = (replay_esn->replay_window - 1) >> 5;

			for (i = 0; i <= nr; i++)

				replay_esn->bmp[i] = 0;



			bitnr = (pos + diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		}



		bitnr = (pos + diff) % replay_esn->replay_window;

		replay_esn->seq = seq;



		if (unlikely(wrap > 0))
@@ -488,18 +461,15 @@ static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) 
	} else {

		diff = replay_esn->seq - seq;



		if (pos >= diff) {

		if (pos >= diff)

			bitnr = (pos - diff) % replay_esn->replay_window;

			nr = bitnr >> 5;

			bitnr = bitnr & 0x1F;

			replay_esn->bmp[nr] |= (1U << bitnr);

		} else {

		else

			bitnr = replay_esn->replay_window - (diff - pos);

	}



	nr = bitnr >> 5;

	bitnr = bitnr & 0x1F;

	replay_esn->bmp[nr] |= (1U << bitnr);

		}

	}



	if (xfrm_aevent_is_on(xs_net(x)))

		xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);