netdev - [PATCH ipsec-next v2 3/5] xfrm: replay: remove recheck indirection

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Message-Id: <20210618135200.14420-4-fw@strlen.de>
Date:   Fri, 18 Jun 2021 15:51:58 +0200
From:   Florian Westphal <fw@...len.de>
To:     <netdev@...r.kernel.org>
Cc:     steffen.klassert@...unet.com, sd@...asysnail.net,
        Florian Westphal <fw@...len.de>
Subject: [PATCH ipsec-next v2 3/5] xfrm: replay: remove recheck indirection

Adds new xfrm_replay_recheck() helper and calls it from
xfrm input path instead of the indirection.

Signed-off-by: Florian Westphal <fw@...len.de>
---
 include/net/xfrm.h     |  4 +---
 net/xfrm/xfrm_input.c  |  2 +-
 net/xfrm/xfrm_replay.c | 22 ++++++++++++++++------
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index a7f997b13198..3a219b34cb8c 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -309,9 +309,6 @@ struct xfrm_replay {
 	int	(*check)(struct xfrm_state *x,
 			 struct sk_buff *skb,
 			 __be32 net_seq);
-	int	(*recheck)(struct xfrm_state *x,
-			   struct sk_buff *skb,
-			   __be32 net_seq);
 	int	(*overflow)(struct xfrm_state *x, struct sk_buff *skb);
 };
 
@@ -1723,6 +1720,7 @@ static inline int xfrm_policy_id2dir(u32 index)
 #ifdef CONFIG_XFRM
 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
 void xfrm_replay_notify(struct xfrm_state *x, int event);
+int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
 
 static inline int xfrm_aevent_is_on(struct net *net)
 {
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index c8971e4b33ab..8046ef1a6680 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -660,7 +660,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 		/* only the first xfrm gets the encap type */
 		encap_type = 0;
 
-		if (x->repl->recheck(x, skb, seq)) {
+		if (xfrm_replay_recheck(x, skb, seq)) {
 			XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
 			goto drop_unlock;
 		}
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 9565b0f7d380..59391dc80fa3 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -519,6 +519,22 @@ static int xfrm_replay_recheck_esn(struct xfrm_state *x,
 	return xfrm_replay_check_esn(x, skb, net_seq);
 }
 
+int xfrm_replay_recheck(struct xfrm_state *x,
+			struct sk_buff *skb, __be32 net_seq)
+{
+	switch (x->repl_mode) {
+	case XFRM_REPLAY_MODE_LEGACY:
+		break;
+	case XFRM_REPLAY_MODE_BMP:
+		/* no special recheck treatment */
+		return xfrm_replay_check_bmp(x, skb, net_seq);
+	case XFRM_REPLAY_MODE_ESN:
+		return xfrm_replay_recheck_esn(x, skb, net_seq);
+	}
+
+	return xfrm_replay_check(x, skb, net_seq);
+}
+
 static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq)
 {
 	unsigned int bitnr, nr, i;
@@ -708,37 +724,31 @@ static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff
 
 static const struct xfrm_replay xfrm_replay_legacy = {
 	.check		= xfrm_replay_check,
-	.recheck	= xfrm_replay_check,
 	.overflow	= xfrm_replay_overflow_offload,
 };
 
 static const struct xfrm_replay xfrm_replay_bmp = {
 	.check		= xfrm_replay_check_bmp,
-	.recheck	= xfrm_replay_check_bmp,
 	.overflow	= xfrm_replay_overflow_offload_bmp,
 };
 
 static const struct xfrm_replay xfrm_replay_esn = {
 	.check		= xfrm_replay_check_esn,
-	.recheck	= xfrm_replay_recheck_esn,
 	.overflow	= xfrm_replay_overflow_offload_esn,
 };
 #else
 static const struct xfrm_replay xfrm_replay_legacy = {
 	.check		= xfrm_replay_check,
-	.recheck	= xfrm_replay_check,
 	.overflow	= xfrm_replay_overflow,
 };
 
 static const struct xfrm_replay xfrm_replay_bmp = {
 	.check		= xfrm_replay_check_bmp,
-	.recheck	= xfrm_replay_check_bmp,
 	.overflow	= xfrm_replay_overflow_bmp,
 };
 
 static const struct xfrm_replay xfrm_replay_esn = {
 	.check		= xfrm_replay_check_esn,
-	.recheck	= xfrm_replay_recheck_esn,
 	.overflow	= xfrm_replay_overflow_esn,
 };
 #endif
-- 
2.31.1