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Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/net/xfrm/xfrm_replay.c
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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(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 (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))
<------><------><------>x->repl->notify(x, XFRM_REPLAY_UPDATE);
<------>}
 
<------>return err;
}
 
static int xfrm_replay_check(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(struct xfrm_state *x, __be32 net_seq)
{
<------>u32 diff;
<------>u32 seq = ntohl(net_seq);
 
<------>if (!x->props.replay_window)
<------><------>return;
 
<------>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)))
<------><------>x->repl->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))
<------><------><------>x->repl->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)))
<------><------>x->repl->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))
<------><------><------>x->repl->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;
}
 
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);
}
 
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)))
<------><------>x->repl->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))
<------><------><------>x->repl->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))
<------><------><------>x->repl->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(oseq < 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))
<------><------><------>x->repl->notify(x, XFRM_REPLAY_UPDATE);
<------>}
 
<------>return err;
}
 
static const struct xfrm_replay xfrm_replay_legacy = {
<------>.advance	= xfrm_replay_advance,
<------>.check		= xfrm_replay_check,
<------>.recheck	= xfrm_replay_check,
<------>.notify		= xfrm_replay_notify,
<------>.overflow	= xfrm_replay_overflow_offload,
};
 
static const struct xfrm_replay xfrm_replay_bmp = {
<------>.advance	= xfrm_replay_advance_bmp,
<------>.check		= xfrm_replay_check_bmp,
<------>.recheck	= xfrm_replay_check_bmp,
<------>.notify		= xfrm_replay_notify_bmp,
<------>.overflow	= xfrm_replay_overflow_offload_bmp,
};
 
static const struct xfrm_replay xfrm_replay_esn = {
<------>.advance	= xfrm_replay_advance_esn,
<------>.check		= xfrm_replay_check_esn,
<------>.recheck	= xfrm_replay_recheck_esn,
<------>.notify		= xfrm_replay_notify_esn,
<------>.overflow	= xfrm_replay_overflow_offload_esn,
};
#else
static const struct xfrm_replay xfrm_replay_legacy = {
<------>.advance	= xfrm_replay_advance,
<------>.check		= xfrm_replay_check,
<------>.recheck	= xfrm_replay_check,
<------>.notify		= xfrm_replay_notify,
<------>.overflow	= xfrm_replay_overflow,
};
 
static const struct xfrm_replay xfrm_replay_bmp = {
<------>.advance	= xfrm_replay_advance_bmp,
<------>.check		= xfrm_replay_check_bmp,
<------>.recheck	= xfrm_replay_check_bmp,
<------>.notify		= xfrm_replay_notify_bmp,
<------>.overflow	= xfrm_replay_overflow_bmp,
};
 
static const struct xfrm_replay xfrm_replay_esn = {
<------>.advance	= xfrm_replay_advance_esn,
<------>.check		= xfrm_replay_check_esn,
<------>.recheck	= xfrm_replay_recheck_esn,
<------>.notify		= xfrm_replay_notify_esn,
<------>.overflow	= xfrm_replay_overflow_esn,
};
#endif
 
int xfrm_init_replay(struct xfrm_state *x)
{
<------>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)
<------><------><------>return -EINVAL;
 
<------><------>if (x->props.flags & XFRM_STATE_ESN) {
<------><------><------>if (replay_esn->replay_window == 0)
<------><------><------><------>return -EINVAL;
<------><------><------>x->repl = &xfrm_replay_esn;
<------><------>} else {
<------><------><------>x->repl = &xfrm_replay_bmp;
<------><------>}
<------>} else {
<------><------>x->repl = &xfrm_replay_legacy;
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL(xfrm_init_replay);
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