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Message-Id: <20200624080804.7480-7-fw@strlen.de>
Date: Wed, 24 Jun 2020 10:08:04 +0200
From: Florian Westphal <fw@...len.de>
To: steffen.klassert@...unet.com
Cc: <netdev@...r.kernel.org>, Florian Westphal <fw@...len.de>
Subject: [PATCH ipsec-next v2 6/6] xfrm: replay: remove last replay indirection
This replaces the overflow indirection with the new xfrm_replay_overflow
helper. After this, the 'repl' pointer in xfrm_state is no longer
needed and can be removed as well.
xfrm_replay_overflow() is added in two incarnations, one is used
when the kernel is configured with xfrm offload enabled, the other
when its disabled.
Signed-off-by: Florian Westphal <fw@...len.de>
---
include/net/xfrm.h | 8 +------
net/xfrm/xfrm_output.c | 2 +-
net/xfrm/xfrm_replay.c | 51 +++++++++++++++++++++---------------------
3 files changed, 28 insertions(+), 33 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 008b564cb126..c0f3e8a3fdd0 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -219,9 +219,6 @@ struct xfrm_state {
struct xfrm_replay_state preplay;
struct xfrm_replay_state_esn *preplay_esn;
- /* The functions for replay detection. */
- const struct xfrm_replay *repl;
-
/* replay detection mode */
enum xfrm_replay_mode repl_mode;
/* internal flag that only holds state for delayed aevent at the
@@ -303,10 +300,6 @@ struct km_event {
struct net *net;
};
-struct xfrm_replay {
- int (*overflow)(struct xfrm_state *x, struct sk_buff *skb);
-};
-
struct xfrm_if_cb {
struct xfrm_if *(*decode_session)(struct sk_buff *skb,
unsigned short family);
@@ -1715,6 +1708,7 @@ static inline int xfrm_policy_id2dir(u32 index)
void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq);
int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq);
void xfrm_replay_notify(struct xfrm_state *x, int event);
+int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb);
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_output.c b/net/xfrm/xfrm_output.c
index e4c23f69f69f..8893a37690ad 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -448,7 +448,7 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
goto error;
}
- err = x->repl->overflow(x, skb);
+ err = xfrm_replay_overflow(x, skb);
if (err) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
goto error;
diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c
index 8c97fcaf17cf..7630d002107b 100644
--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -97,7 +97,7 @@ void xfrm_replay_notify(struct xfrm_state *x, int event)
x->xflags &= ~XFRM_TIME_DEFER;
}
-static int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
+static int __xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct net *net = xs_net(x);
@@ -601,7 +601,7 @@ static int xfrm_replay_overflow_offload(struct xfrm_state *x, struct sk_buff *sk
__u32 oseq = x->replay.oseq;
if (!xo)
- return xfrm_replay_overflow(x, skb);
+ return __xfrm_replay_overflow(x, skb);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
if (!skb_is_gso(skb)) {
@@ -719,29 +719,33 @@ static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff
return err;
}
-static const struct xfrm_replay xfrm_replay_legacy = {
- .overflow = xfrm_replay_overflow_offload,
-};
-
-static const struct xfrm_replay xfrm_replay_bmp = {
- .overflow = xfrm_replay_overflow_offload_bmp,
-};
+int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
+{
+ switch (x->repl_mode) {
+ case XFRM_REPLAY_MODE_LEGACY:
+ break;
+ case XFRM_REPLAY_MODE_BMP:
+ return xfrm_replay_overflow_offload_bmp(x, skb);
+ case XFRM_REPLAY_MODE_ESN:
+ return xfrm_replay_overflow_offload_esn(x, skb);
+ }
-static const struct xfrm_replay xfrm_replay_esn = {
- .overflow = xfrm_replay_overflow_offload_esn,
-};
+ return xfrm_replay_overflow_offload(x, skb);
+}
#else
-static const struct xfrm_replay xfrm_replay_legacy = {
- .overflow = xfrm_replay_overflow,
-};
-
-static const struct xfrm_replay xfrm_replay_bmp = {
- .overflow = xfrm_replay_overflow_bmp,
-};
+int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
+{
+ switch (x->repl_mode) {
+ case XFRM_REPLAY_MODE_LEGACY:
+ break;
+ case XFRM_REPLAY_MODE_BMP:
+ return xfrm_replay_overflow_bmp(x, skb);
+ case XFRM_REPLAY_MODE_ESN:
+ return xfrm_replay_overflow_esn(x, skb);
+ }
-static const struct xfrm_replay xfrm_replay_esn = {
- .overflow = xfrm_replay_overflow_esn,
-};
+ return __xfrm_replay_overflow(x, skb);
+}
#endif
int xfrm_init_replay(struct xfrm_state *x)
@@ -756,14 +760,11 @@ int xfrm_init_replay(struct xfrm_state *x)
if (x->props.flags & XFRM_STATE_ESN) {
if (replay_esn->replay_window == 0)
return -EINVAL;
- x->repl = &xfrm_replay_esn;
x->repl_mode = XFRM_REPLAY_MODE_ESN;
} else {
- x->repl = &xfrm_replay_bmp;
x->repl_mode = XFRM_REPLAY_MODE_BMP;
}
} else {
- x->repl = &xfrm_replay_legacy;
x->repl_mode = XFRM_REPLAY_MODE_LEGACY;
}
--
2.26.2
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