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linux/net/xfrm/xfrm_replay.c
Antony Antony a4a87fa4e9 xfrm: Add Direction to the SA in or out 
This patch introduces the 'dir' attribute, 'in' or 'out', to the
xfrm_state, SA, enhancing usability by delineating the scope of values
based on direction. An input SA will restrict values pertinent to input,
effectively segregating them from output-related values.
And an output SA will restrict attributes for output. This change aims
to streamline the configuration process and improve the overall
consistency of SA attributes during configuration.

This feature sets the groundwork for future patches, including
the upcoming IP-TFS patch.

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2024-05-01 10:05:11 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* xfrm_replay.c - xfrm replay detection, derived from xfrm_state.c.
*
* Copyright (C) 2010 secunet Security Networks AG
* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
*/
#include <linux/export.h>
#include <net/xfrm.h>
u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq)
{
u32 seq, seq_hi, bottom;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
if (!(x->props.flags & XFRM_STATE_ESN))
return 0;
seq = ntohl(net_seq);
seq_hi = replay_esn->seq_hi;
bottom = replay_esn->seq - replay_esn->replay_window + 1;
if (likely(replay_esn->seq >= replay_esn->replay_window - 1)) {
/* A. same subspace */
if (unlikely(seq < bottom))
seq_hi++;
} else {
/* B. window spans two subspaces */
if (unlikely(seq >= bottom))
seq_hi--;
}
return seq_hi;
}
EXPORT_SYMBOL(xfrm_replay_seqhi);
static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event);
static void xfrm_replay_notify_esn(struct xfrm_state *x, int event);
void xfrm_replay_notify(struct xfrm_state *x, int event)
{
struct km_event c;
/* we send notify messages in case
* 1. we updated on of the sequence numbers, and the seqno difference
* is at least x->replay_maxdiff, in this case we also update the
* timeout of our timer function
* 2. if x->replay_maxage has elapsed since last update,
* and there were changes
*
* The state structure must be locked!
*/
switch (x->repl_mode) {
case XFRM_REPLAY_MODE_LEGACY:
break;
case XFRM_REPLAY_MODE_BMP:
xfrm_replay_notify_bmp(x, event);
return;
case XFRM_REPLAY_MODE_ESN:
xfrm_replay_notify_esn(x, event);
return;
}
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->xflags & XFRM_TIME_DEFER)
event = XFRM_REPLAY_TIMEOUT;
else
return;
}
break;
case XFRM_REPLAY_TIMEOUT:
if (memcmp(&x->replay, &x->preplay,
sizeof(struct xfrm_replay_state)) == 0) {
x->xflags |= XFRM_TIME_DEFER;
return;
}
break;
}
memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
c.event = XFRM_MSG_NEWAE;
c.data.aevent = event;
km_state_notify(x, &c);
if (x->replay_maxage &&
!mod_timer(&x->rtimer, jiffies + x->replay_maxage))
x->xflags &= ~XFRM_TIME_DEFER;
}
static int __xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct net *net = xs_net(x);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
XFRM_SKB_CB(skb)->seq.output.low = ++x->replay.oseq;
XFRM_SKB_CB(skb)->seq.output.hi = 0;
if (unlikely(x->replay.oseq == 0) &&
!(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) {
x->replay.oseq--;
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
}
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
static int xfrm_replay_check_legacy(struct xfrm_state *x,
struct sk_buff *skb, __be32 net_seq)
{
u32 diff;
u32 seq = ntohl(net_seq);
if (!x->props.replay_window)
return 0;
if (unlikely(seq == 0))
goto err;
if (likely(seq > x->replay.seq))
return 0;
diff = x->replay.seq - seq;
if (diff >= x->props.replay_window) {
x->stats.replay_window++;
goto err;
}
if (x->replay.bitmap & (1U << diff)) {
x->stats.replay++;
goto err;
}
return 0;
err:
xfrm_audit_state_replay(x, skb, net_seq);
return -EINVAL;
}
static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq);
static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq);
void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
{
u32 diff, seq;
switch (x->repl_mode) {
case XFRM_REPLAY_MODE_LEGACY:
break;
case XFRM_REPLAY_MODE_BMP:
return xfrm_replay_advance_bmp(x, net_seq);
case XFRM_REPLAY_MODE_ESN:
return xfrm_replay_advance_esn(x, net_seq);
}
if (!x->props.replay_window)
return;
seq = ntohl(net_seq);
if (seq > x->replay.seq) {
diff = seq - x->replay.seq;
if (diff < x->props.replay_window)
x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
else
x->replay.bitmap = 1;
x->replay.seq = seq;
} else {
diff = x->replay.seq - seq;
x->replay.bitmap |= (1U << diff);
}
if (xfrm_aevent_is_on(xs_net(x)))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
static int xfrm_replay_overflow_bmp(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct net *net = xs_net(x);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq;
XFRM_SKB_CB(skb)->seq.output.hi = 0;
if (unlikely(replay_esn->oseq == 0) &&
!(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) {
replay_esn->oseq--;
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
}
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
static int xfrm_replay_check_bmp(struct xfrm_state *x,
struct sk_buff *skb, __be32 net_seq)
{
unsigned int bitnr, nr;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
u32 pos;
u32 seq = ntohl(net_seq);
u32 diff = replay_esn->seq - seq;
if (!replay_esn->replay_window)
return 0;
if (unlikely(seq == 0))
goto err;
if (likely(seq > replay_esn->seq))
return 0;
if (diff >= replay_esn->replay_window) {
x->stats.replay_window++;
goto err;
}
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (pos >= diff)
bitnr = (pos - diff) % replay_esn->replay_window;
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:
x->stats.replay++;
err:
xfrm_audit_state_replay(x, skb, net_seq);
return -EINVAL;
}
static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq)
{
unsigned int bitnr, nr, i;
u32 diff;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
u32 seq = ntohl(net_seq);
u32 pos;
if (!replay_esn->replay_window)
return;
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (seq > replay_esn->seq) {
diff = seq - replay_esn->seq;
if (diff < replay_esn->replay_window) {
for (i = 1; i < diff; i++) {
bitnr = (pos + i) % 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;
replay_esn->seq = seq;
} else {
diff = replay_esn->seq - seq;
if (pos >= diff)
bitnr = (pos - diff) % replay_esn->replay_window;
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);
}
static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event)
{
struct km_event c;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn;
/* we send notify messages in case
* 1. we updated on of the sequence numbers, and the seqno difference
* is at least x->replay_maxdiff, in this case we also update the
* timeout of our timer function
* 2. if x->replay_maxage has elapsed since last update,
* and there were changes
*
* The state structure must be locked!
*/
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->xflags & XFRM_TIME_DEFER)
event = XFRM_REPLAY_TIMEOUT;
else
return;
}
break;
case XFRM_REPLAY_TIMEOUT:
if (memcmp(x->replay_esn, x->preplay_esn,
xfrm_replay_state_esn_len(replay_esn)) == 0) {
x->xflags |= XFRM_TIME_DEFER;
return;
}
break;
}
memcpy(x->preplay_esn, x->replay_esn,
xfrm_replay_state_esn_len(replay_esn));
c.event = XFRM_MSG_NEWAE;
c.data.aevent = event;
km_state_notify(x, &c);
if (x->replay_maxage &&
!mod_timer(&x->rtimer, jiffies + x->replay_maxage))
x->xflags &= ~XFRM_TIME_DEFER;
}
static void xfrm_replay_notify_esn(struct xfrm_state *x, int event)
{
u32 seq_diff, oseq_diff;
struct km_event c;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn;
/* we send notify messages in case
* 1. we updated on of the sequence numbers, and the seqno difference
* is at least x->replay_maxdiff, in this case we also update the
* timeout of our timer function
* 2. if x->replay_maxage has elapsed since last update,
* and there were changes
*
* The state structure must be locked!
*/
switch (event) {
case XFRM_REPLAY_UPDATE:
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;
if (replay_esn->oseq_hi == preplay_esn->oseq_hi)
oseq_diff = replay_esn->oseq
- preplay_esn->oseq;
else
oseq_diff = ~preplay_esn->oseq
+ replay_esn->oseq + 1;
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;
case XFRM_REPLAY_TIMEOUT:
if (memcmp(x->replay_esn, x->preplay_esn,
xfrm_replay_state_esn_len(replay_esn)) == 0) {
x->xflags |= XFRM_TIME_DEFER;
return;
}
break;
}
memcpy(x->preplay_esn, x->replay_esn,
xfrm_replay_state_esn_len(replay_esn));
c.event = XFRM_MSG_NEWAE;
c.data.aevent = event;
km_state_notify(x, &c);
if (x->replay_maxage &&
!mod_timer(&x->rtimer, jiffies + x->replay_maxage))
x->xflags &= ~XFRM_TIME_DEFER;
}
static int xfrm_replay_overflow_esn(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct net *net = xs_net(x);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq;
XFRM_SKB_CB(skb)->seq.output.hi = replay_esn->oseq_hi;
if (unlikely(replay_esn->oseq == 0)) {
XFRM_SKB_CB(skb)->seq.output.hi = ++replay_esn->oseq_hi;
if (replay_esn->oseq_hi == 0) {
replay_esn->oseq--;
replay_esn->oseq_hi--;
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
}
}
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
static int xfrm_replay_check_esn(struct xfrm_state *x,
struct sk_buff *skb, __be32 net_seq)
{
unsigned int bitnr, nr;
u32 diff;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
u32 pos;
u32 seq = ntohl(net_seq);
u32 wsize = replay_esn->replay_window;
u32 top = replay_esn->seq;
u32 bottom = top - wsize + 1;
if (!wsize)
return 0;
if (unlikely(seq == 0 && replay_esn->seq_hi == 0 &&
(replay_esn->seq < replay_esn->replay_window - 1)))
goto err;
diff = top - seq;
if (likely(top >= wsize - 1)) {
/* A. same subspace */
if (likely(seq > top) || seq < bottom)
return 0;
} else {
/* B. window spans two subspaces */
if (likely(seq > top && seq < bottom))
return 0;
if (seq >= bottom)
diff = ~seq + top + 1;
}
if (diff >= replay_esn->replay_window) {
x->stats.replay_window++;
goto err;
}
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
if (pos >= diff)
bitnr = (pos - diff) % replay_esn->replay_window;
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:
x->stats.replay++;
err:
xfrm_audit_state_replay(x, skb, net_seq);
return -EINVAL;
}
int xfrm_replay_check(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:
return xfrm_replay_check_bmp(x, skb, net_seq);
case XFRM_REPLAY_MODE_ESN:
return xfrm_replay_check_esn(x, skb, net_seq);
}
return xfrm_replay_check_legacy(x, skb, net_seq);
}
static int xfrm_replay_recheck_esn(struct xfrm_state *x,
struct sk_buff *skb, __be32 net_seq)
{
if (unlikely(XFRM_SKB_CB(skb)->seq.input.hi !=
htonl(xfrm_replay_seqhi(x, net_seq)))) {
x->stats.replay_window++;
return -EINVAL;
}
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_legacy(x, skb, net_seq);
}
static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq)
{
unsigned int bitnr, nr, i;
int wrap;
u32 diff, pos, seq, seq_hi;
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
if (!replay_esn->replay_window)
return;
seq = ntohl(net_seq);
pos = (replay_esn->seq - 1) % replay_esn->replay_window;
seq_hi = xfrm_replay_seqhi(x, net_seq);
wrap = seq_hi - replay_esn->seq_hi;
if ((!wrap && seq > replay_esn->seq) || wrap > 0) {
if (likely(!wrap))
diff = seq - replay_esn->seq;
else
diff = ~replay_esn->seq + seq + 1;
if (diff < replay_esn->replay_window) {
for (i = 1; i < diff; i++) {
bitnr = (pos + i) % 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;
replay_esn->seq = seq;
if (unlikely(wrap > 0))
replay_esn->seq_hi++;
} else {
diff = replay_esn->seq - seq;
if (pos >= diff)
bitnr = (pos - diff) % replay_esn->replay_window;
else
bitnr = replay_esn->replay_window - (diff - pos);
}
xfrm_dev_state_advance_esn(x);
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);
}
#ifdef CONFIG_XFRM_OFFLOAD
static int xfrm_replay_overflow_offload(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct net *net = xs_net(x);
struct xfrm_offload *xo = xfrm_offload(skb);
__u32 oseq = x->replay.oseq;
if (!xo)
return __xfrm_replay_overflow(x, skb);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
if (!skb_is_gso(skb)) {
XFRM_SKB_CB(skb)->seq.output.low = ++oseq;
xo->seq.low = oseq;
} else {
XFRM_SKB_CB(skb)->seq.output.low = oseq + 1;
xo->seq.low = oseq + 1;
oseq += skb_shinfo(skb)->gso_segs;
}
XFRM_SKB_CB(skb)->seq.output.hi = 0;
xo->seq.hi = 0;
if (unlikely(oseq < x->replay.oseq) &&
!(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) {
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
}
x->replay.oseq = oseq;
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
static int xfrm_replay_overflow_offload_bmp(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct xfrm_offload *xo = xfrm_offload(skb);
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct net *net = xs_net(x);
__u32 oseq = replay_esn->oseq;
if (!xo)
return xfrm_replay_overflow_bmp(x, skb);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
if (!skb_is_gso(skb)) {
XFRM_SKB_CB(skb)->seq.output.low = ++oseq;
xo->seq.low = oseq;
} else {
XFRM_SKB_CB(skb)->seq.output.low = oseq + 1;
xo->seq.low = oseq + 1;
oseq += skb_shinfo(skb)->gso_segs;
}
XFRM_SKB_CB(skb)->seq.output.hi = 0;
xo->seq.hi = 0;
if (unlikely(oseq < replay_esn->oseq) &&
!(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) {
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
} else {
replay_esn->oseq = oseq;
}
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff *skb)
{
int err = 0;
struct xfrm_offload *xo = xfrm_offload(skb);
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
struct net *net = xs_net(x);
__u32 oseq = replay_esn->oseq;
__u32 oseq_hi = replay_esn->oseq_hi;
if (!xo)
return xfrm_replay_overflow_esn(x, skb);
if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
if (!skb_is_gso(skb)) {
XFRM_SKB_CB(skb)->seq.output.low = ++oseq;
XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi;
xo->seq.low = oseq;
xo->seq.hi = oseq_hi;
} else {
XFRM_SKB_CB(skb)->seq.output.low = oseq + 1;
XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi;
xo->seq.low = oseq + 1;
xo->seq.hi = oseq_hi;
oseq += skb_shinfo(skb)->gso_segs;
}
if (unlikely(xo->seq.low < replay_esn->oseq)) {
XFRM_SKB_CB(skb)->seq.output.hi = ++oseq_hi;
xo->seq.hi = oseq_hi;
replay_esn->oseq_hi = oseq_hi;
if (replay_esn->oseq_hi == 0) {
replay_esn->oseq--;
replay_esn->oseq_hi--;
xfrm_audit_state_replay_overflow(x, skb);
err = -EOVERFLOW;
return err;
}
}
replay_esn->oseq = oseq;
if (xfrm_aevent_is_on(net))
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
return err;
}
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);
}
return xfrm_replay_overflow_offload(x, skb);
}
#else
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);
}
return __xfrm_replay_overflow(x, skb);
}
#endif
int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack)
{
struct xfrm_replay_state_esn *replay_esn = x->replay_esn;
if (replay_esn) {
if (replay_esn->replay_window >
replay_esn->bmp_len * sizeof(__u32) * 8) {
NL_SET_ERR_MSG(extack, "ESN replay window is too large for the chosen bitmap size");
return -EINVAL;
}
if (x->props.flags & XFRM_STATE_ESN) {
if (replay_esn->replay_window == 0 &&
(!x->dir || x->dir == XFRM_SA_DIR_IN)) {
NL_SET_ERR_MSG(extack, "ESN replay window must be > 0");
return -EINVAL;
}
x->repl_mode = XFRM_REPLAY_MODE_ESN;
} else {
x->repl_mode = XFRM_REPLAY_MODE_BMP;
}
} else {
x->repl_mode = XFRM_REPLAY_MODE_LEGACY;
}
return 0;
}
EXPORT_SYMBOL(xfrm_init_replay);
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