xfrm_state.c

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/*
 * xfrm_state.c
 *
 * Changes:
 *  Mitsuru KANDA @USAGI
 *  Kazunori MIYAZAWA @USAGI
 *  Kunihiro Ishiguro <[email protected]>
 *      IPv6 support
 *  YOSHIFUJI Hideaki @USAGI
 *      Split up af-specific functions
 *  Derek Atkins <[email protected]>
 *      Add UDP Encapsulation
 *
 */

#include <linux/workqueue.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/module.h>
#include <linux/cache.h>
#include <linux/audit.h>
#include <asm/uaccess.h>
#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>

#include "xfrm_hash.h"

/* Each xfrm_state may be linked to two tables:

   1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
   2. Hash table by (daddr,family,reqid) to find what SAs exist for given
      destination/tunnel endpoint. (output)
 */

static DEFINE_SPINLOCK(xfrm_state_lock);

static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;

static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);

static inline unsigned int xfrm_dst_hash(struct net *net,
                     const xfrm_address_t *daddr,
                     const xfrm_address_t *saddr,
                     u32 reqid,
                     unsigned short family)
{
    return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
}

static inline unsigned int xfrm_src_hash(struct net *net,
                     const xfrm_address_t *daddr,
                     const xfrm_address_t *saddr,
                     unsigned short family)
{
    return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
}

static inline unsigned int
xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
          __be32 spi, u8 proto, unsigned short family)
{
    return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
}

static void xfrm_hash_transfer(struct hlist_head *list,
                   struct hlist_head *ndsttable,
                   struct hlist_head *nsrctable,
                   struct hlist_head *nspitable,
                   unsigned int nhashmask)
{
    struct hlist_node *entry, *tmp;
    struct xfrm_state *x;

    hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
        unsigned int h;

        h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
                    x->props.reqid, x->props.family,
                    nhashmask);
        hlist_add_head(&x->bydst, ndsttable+h);

        h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
                    x->props.family,
                    nhashmask);
        hlist_add_head(&x->bysrc, nsrctable+h);

        if (x->id.spi) {
            h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
                        x->id.proto, x->props.family,
                        nhashmask);
            hlist_add_head(&x->byspi, nspitable+h);
        }
    }
}

static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
{
    return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
}

static DEFINE_MUTEX(hash_resize_mutex);

static void xfrm_hash_resize(struct work_struct *work)
{
    struct net *net = container_of(work, struct net, xfrm.state_hash_work);
    struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
    unsigned long nsize, osize;
    unsigned int nhashmask, ohashmask;
    int i;

    mutex_lock(&hash_resize_mutex);

    nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
    ndst = xfrm_hash_alloc(nsize);
    if (!ndst)
        goto out_unlock;
    nsrc = xfrm_hash_alloc(nsize);
    if (!nsrc) {
        xfrm_hash_free(ndst, nsize);
        goto out_unlock;
    }
    nspi = xfrm_hash_alloc(nsize);
    if (!nspi) {
        xfrm_hash_free(ndst, nsize);
        xfrm_hash_free(nsrc, nsize);
        goto out_unlock;
    }

    spin_lock_bh(&xfrm_state_lock);

    nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
    for (i = net->xfrm.state_hmask; i >= 0; i--)
        xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
                   nhashmask);

    odst = net->xfrm.state_bydst;
    osrc = net->xfrm.state_bysrc;
    ospi = net->xfrm.state_byspi;
    ohashmask = net->xfrm.state_hmask;

    net->xfrm.state_bydst = ndst;
    net->xfrm.state_bysrc = nsrc;
    net->xfrm.state_byspi = nspi;
    net->xfrm.state_hmask = nhashmask;

    spin_unlock_bh(&xfrm_state_lock);

    osize = (ohashmask + 1) * sizeof(struct hlist_head);
    xfrm_hash_free(odst, osize);
    xfrm_hash_free(osrc, osize);
    xfrm_hash_free(ospi, osize);

out_unlock:
    mutex_unlock(&hash_resize_mutex);
}

static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];

static DEFINE_SPINLOCK(xfrm_state_gc_lock);

int __xfrm_state_delete(struct xfrm_state *x);

int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
void km_state_expired(struct xfrm_state *x, int hard, u32 portid);

static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
{
    struct xfrm_state_afinfo *afinfo;
    if (unlikely(family >= NPROTO))
        return NULL;
    write_lock_bh(&xfrm_state_afinfo_lock);
    afinfo = xfrm_state_afinfo[family];
    if (unlikely(!afinfo))
        write_unlock_bh(&xfrm_state_afinfo_lock);
    return afinfo;
}

static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
    __releases(xfrm_state_afinfo_lock)
{
    write_unlock_bh(&xfrm_state_afinfo_lock);
}

int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
{
    struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
    const struct xfrm_type **typemap;
    int err = 0;

    if (unlikely(afinfo == NULL))
        return -EAFNOSUPPORT;
    typemap = afinfo->type_map;

    if (likely(typemap[type->proto] == NULL))
        typemap[type->proto] = type;
    else
        err = -EEXIST;
    xfrm_state_unlock_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_register_type);

int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
{
    struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
    const struct xfrm_type **typemap;
    int err = 0;

    if (unlikely(afinfo == NULL))
        return -EAFNOSUPPORT;
    typemap = afinfo->type_map;

    if (unlikely(typemap[type->proto] != type))
        err = -ENOENT;
    else
        typemap[type->proto] = NULL;
    xfrm_state_unlock_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_unregister_type);

static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
{
    struct xfrm_state_afinfo *afinfo;
    const struct xfrm_type **typemap;
    const struct xfrm_type *type;
    int modload_attempted = 0;

retry:
    afinfo = xfrm_state_get_afinfo(family);
    if (unlikely(afinfo == NULL))
        return NULL;
    typemap = afinfo->type_map;

    type = typemap[proto];
    if (unlikely(type && !try_module_get(type->owner)))
        type = NULL;
    if (!type && !modload_attempted) {
        xfrm_state_put_afinfo(afinfo);
        request_module("xfrm-type-%d-%d", family, proto);
        modload_attempted = 1;
        goto retry;
    }

    xfrm_state_put_afinfo(afinfo);
    return type;
}

static void xfrm_put_type(const struct xfrm_type *type)
{
    module_put(type->owner);
}

int xfrm_register_mode(struct xfrm_mode *mode, int family)
{
    struct xfrm_state_afinfo *afinfo;
    struct xfrm_mode **modemap;
    int err;

    if (unlikely(mode->encap >= XFRM_MODE_MAX))
        return -EINVAL;

    afinfo = xfrm_state_lock_afinfo(family);
    if (unlikely(afinfo == NULL))
        return -EAFNOSUPPORT;

    err = -EEXIST;
    modemap = afinfo->mode_map;
    if (modemap[mode->encap])
        goto out;

    err = -ENOENT;
    if (!try_module_get(afinfo->owner))
        goto out;

    mode->afinfo = afinfo;
    modemap[mode->encap] = mode;
    err = 0;

out:
    xfrm_state_unlock_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_register_mode);

int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
{
    struct xfrm_state_afinfo *afinfo;
    struct xfrm_mode **modemap;
    int err;

    if (unlikely(mode->encap >= XFRM_MODE_MAX))
        return -EINVAL;

    afinfo = xfrm_state_lock_afinfo(family);
    if (unlikely(afinfo == NULL))
        return -EAFNOSUPPORT;

    err = -ENOENT;
    modemap = afinfo->mode_map;
    if (likely(modemap[mode->encap] == mode)) {
        modemap[mode->encap] = NULL;
        module_put(mode->afinfo->owner);
        err = 0;
    }

    xfrm_state_unlock_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_unregister_mode);

static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
{
    struct xfrm_state_afinfo *afinfo;
    struct xfrm_mode *mode;
    int modload_attempted = 0;

    if (unlikely(encap >= XFRM_MODE_MAX))
        return NULL;

retry:
    afinfo = xfrm_state_get_afinfo(family);
    if (unlikely(afinfo == NULL))
        return NULL;

    mode = afinfo->mode_map[encap];
    if (unlikely(mode && !try_module_get(mode->owner)))
        mode = NULL;
    if (!mode && !modload_attempted) {
        xfrm_state_put_afinfo(afinfo);
        request_module("xfrm-mode-%d-%d", family, encap);
        modload_attempted = 1;
        goto retry;
    }

    xfrm_state_put_afinfo(afinfo);
    return mode;
}

static void xfrm_put_mode(struct xfrm_mode *mode)
{
    module_put(mode->owner);
}

static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
    tasklet_hrtimer_cancel(&x->mtimer);
    del_timer_sync(&x->rtimer);
    kfree(x->aalg);
    kfree(x->ealg);
    kfree(x->calg);
    kfree(x->encap);
    kfree(x->coaddr);
    kfree(x->replay_esn);
    kfree(x->preplay_esn);
    if (x->inner_mode)
        xfrm_put_mode(x->inner_mode);
    if (x->inner_mode_iaf)
        xfrm_put_mode(x->inner_mode_iaf);
    if (x->outer_mode)
        xfrm_put_mode(x->outer_mode);
    if (x->type) {
        x->type->destructor(x);
        xfrm_put_type(x->type);
    }
    security_xfrm_state_free(x);
    kfree(x);
}

static void xfrm_state_gc_task(struct work_struct *work)
{
    struct net *net = container_of(work, struct net, xfrm.state_gc_work);
    struct xfrm_state *x;
    struct hlist_node *entry, *tmp;
    struct hlist_head gc_list;

    spin_lock_bh(&xfrm_state_gc_lock);
    hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
    spin_unlock_bh(&xfrm_state_gc_lock);

    hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
        xfrm_state_gc_destroy(x);

    wake_up(&net->xfrm.km_waitq);
}

static inline unsigned long make_jiffies(long secs)
{
    if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
        return MAX_SCHEDULE_TIMEOUT-1;
    else
        return secs*HZ;
}

static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
{
    struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
    struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
    struct net *net = xs_net(x);
    unsigned long now = get_seconds();
    long next = LONG_MAX;
    int warn = 0;
    int err = 0;

    spin_lock(&x->lock);
    if (x->km.state == XFRM_STATE_DEAD)
        goto out;
    if (x->km.state == XFRM_STATE_EXPIRED)
        goto expired;
    if (x->lft.hard_add_expires_seconds) {
        long tmo = x->lft.hard_add_expires_seconds +
            x->curlft.add_time - now;
        if (tmo <= 0) {
            if (x->xflags & XFRM_SOFT_EXPIRE) {
                /* enter hard expire without soft expire first?!
                 * setting a new date could trigger this.
                 * workarbound: fix x->curflt.add_time by below:
                 */
                x->curlft.add_time = now - x->saved_tmo - 1;
                tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
            } else
                goto expired;
        }
        if (tmo < next)
            next = tmo;
    }
    if (x->lft.hard_use_expires_seconds) {
        long tmo = x->lft.hard_use_expires_seconds +
            (x->curlft.use_time ? : now) - now;
        if (tmo <= 0)
            goto expired;
        if (tmo < next)
            next = tmo;
    }
    if (x->km.dying)
        goto resched;
    if (x->lft.soft_add_expires_seconds) {
        long tmo = x->lft.soft_add_expires_seconds +
            x->curlft.add_time - now;
        if (tmo <= 0) {
            warn = 1;
            x->xflags &= ~XFRM_SOFT_EXPIRE;
        } else if (tmo < next) {
            next = tmo;
            x->xflags |= XFRM_SOFT_EXPIRE;
            x->saved_tmo = tmo;
        }
    }
    if (x->lft.soft_use_expires_seconds) {
        long tmo = x->lft.soft_use_expires_seconds +
            (x->curlft.use_time ? : now) - now;
        if (tmo <= 0)
            warn = 1;
        else if (tmo < next)
            next = tmo;
    }

    x->km.dying = warn;
    if (warn)
        km_state_expired(x, 0, 0);
resched:
    if (next != LONG_MAX){
        tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
    }

    goto out;

expired:
    if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
        x->km.state = XFRM_STATE_EXPIRED;
        wake_up(&net->xfrm.km_waitq);
        next = 2;
        goto resched;
    }

    err = __xfrm_state_delete(x);
    if (!err && x->id.spi)
        km_state_expired(x, 1, 0);

    xfrm_audit_state_delete(x, err ? 0 : 1,
                audit_get_loginuid(current),
                audit_get_sessionid(current), 0);

out:
    spin_unlock(&x->lock);
    return HRTIMER_NORESTART;
}

static void xfrm_replay_timer_handler(unsigned long data);

struct xfrm_state *xfrm_state_alloc(struct net *net)
{
    struct xfrm_state *x;

    x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);

    if (x) {
        write_pnet(&x->xs_net, net);
        atomic_set(&x->refcnt, 1);
        atomic_set(&x->tunnel_users, 0);
        INIT_LIST_HEAD(&x->km.all);
        INIT_HLIST_NODE(&x->bydst);
        INIT_HLIST_NODE(&x->bysrc);
        INIT_HLIST_NODE(&x->byspi);
        tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
        setup_timer(&x->rtimer, xfrm_replay_timer_handler,
                (unsigned long)x);
        x->curlft.add_time = get_seconds();
        x->lft.soft_byte_limit = XFRM_INF;
        x->lft.soft_packet_limit = XFRM_INF;
        x->lft.hard_byte_limit = XFRM_INF;
        x->lft.hard_packet_limit = XFRM_INF;
        x->replay_maxage = 0;
        x->replay_maxdiff = 0;
        x->inner_mode = NULL;
        x->inner_mode_iaf = NULL;
        spin_lock_init(&x->lock);
    }
    return x;
}
EXPORT_SYMBOL(xfrm_state_alloc);

void __xfrm_state_destroy(struct xfrm_state *x)
{
    struct net *net = xs_net(x);

    WARN_ON(x->km.state != XFRM_STATE_DEAD);

    spin_lock_bh(&xfrm_state_gc_lock);
    hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
    spin_unlock_bh(&xfrm_state_gc_lock);
    schedule_work(&net->xfrm.state_gc_work);
}
EXPORT_SYMBOL(__xfrm_state_destroy);

int __xfrm_state_delete(struct xfrm_state *x)
{
    struct net *net = xs_net(x);
    int err = -ESRCH;

    if (x->km.state != XFRM_STATE_DEAD) {
        x->km.state = XFRM_STATE_DEAD;
        spin_lock(&xfrm_state_lock);
        list_del(&x->km.all);
        hlist_del(&x->bydst);
        hlist_del(&x->bysrc);
        if (x->id.spi)
            hlist_del(&x->byspi);
        net->xfrm.state_num--;
        spin_unlock(&xfrm_state_lock);

        /* All xfrm_state objects are created by xfrm_state_alloc.
         * The xfrm_state_alloc call gives a reference, and that
         * is what we are dropping here.
         */
        xfrm_state_put(x);
        err = 0;
    }

    return err;
}
EXPORT_SYMBOL(__xfrm_state_delete);

int xfrm_state_delete(struct xfrm_state *x)
{
    int err;

    spin_lock_bh(&x->lock);
    err = __xfrm_state_delete(x);
    spin_unlock_bh(&x->lock);

    return err;
}
EXPORT_SYMBOL(xfrm_state_delete);

#ifdef CONFIG_SECURITY_NETWORK_XFRM
static inline int
xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
{
    int i, err = 0;

    for (i = 0; i <= net->xfrm.state_hmask; i++) {
        struct hlist_node *entry;
        struct xfrm_state *x;

        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
            if (xfrm_id_proto_match(x->id.proto, proto) &&
               (err = security_xfrm_state_delete(x)) != 0) {
                xfrm_audit_state_delete(x, 0,
                            audit_info->loginuid,
                            audit_info->sessionid,
                            audit_info->secid);
                return err;
            }
        }
    }

    return err;
}
#else
static inline int
xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
{
    return 0;
}
#endif

int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
{
    int i, err = 0, cnt = 0;

    spin_lock_bh(&xfrm_state_lock);
    err = xfrm_state_flush_secctx_check(net, proto, audit_info);
    if (err)
        goto out;

    err = -ESRCH;
    for (i = 0; i <= net->xfrm.state_hmask; i++) {
        struct hlist_node *entry;
        struct xfrm_state *x;
restart:
        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
            if (!xfrm_state_kern(x) &&
                xfrm_id_proto_match(x->id.proto, proto)) {
                xfrm_state_hold(x);
                spin_unlock_bh(&xfrm_state_lock);

                err = xfrm_state_delete(x);
                xfrm_audit_state_delete(x, err ? 0 : 1,
                            audit_info->loginuid,
                            audit_info->sessionid,
                            audit_info->secid);
                xfrm_state_put(x);
                if (!err)
                    cnt++;

                spin_lock_bh(&xfrm_state_lock);
                goto restart;
            }
        }
    }
    if (cnt)
        err = 0;

out:
    spin_unlock_bh(&xfrm_state_lock);
    wake_up(&net->xfrm.km_waitq);
    return err;
}
EXPORT_SYMBOL(xfrm_state_flush);

void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
{
    spin_lock_bh(&xfrm_state_lock);
    si->sadcnt = net->xfrm.state_num;
    si->sadhcnt = net->xfrm.state_hmask;
    si->sadhmcnt = xfrm_state_hashmax;
    spin_unlock_bh(&xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_sad_getinfo);

static int
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
            const struct xfrm_tmpl *tmpl,
            const xfrm_address_t *daddr, const xfrm_address_t *saddr,
            unsigned short family)
{
    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
    if (!afinfo)
        return -1;
    afinfo->init_tempsel(&x->sel, fl);

    if (family != tmpl->encap_family) {
        xfrm_state_put_afinfo(afinfo);
        afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
        if (!afinfo)
            return -1;
    }
    afinfo->init_temprop(x, tmpl, daddr, saddr);
    xfrm_state_put_afinfo(afinfo);
    return 0;
}

static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
                          const xfrm_address_t *daddr,
                          __be32 spi, u8 proto,
                          unsigned short family)
{
    unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
    struct xfrm_state *x;
    struct hlist_node *entry;

    hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
        if (x->props.family != family ||
            x->id.spi       != spi ||
            x->id.proto     != proto ||
            xfrm_addr_cmp(&x->id.daddr, daddr, family))
            continue;

        if ((mark & x->mark.m) != x->mark.v)
            continue;
        xfrm_state_hold(x);
        return x;
    }

    return NULL;
}

static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
                             const xfrm_address_t *daddr,
                             const xfrm_address_t *saddr,
                             u8 proto, unsigned short family)
{
    unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
    struct xfrm_state *x;
    struct hlist_node *entry;

    hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
        if (x->props.family != family ||
            x->id.proto     != proto ||
            xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
            xfrm_addr_cmp(&x->props.saddr, saddr, family))
            continue;

        if ((mark & x->mark.m) != x->mark.v)
            continue;
        xfrm_state_hold(x);
        return x;
    }

    return NULL;
}

static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
{
    struct net *net = xs_net(x);
    u32 mark = x->mark.v & x->mark.m;

    if (use_spi)
        return __xfrm_state_lookup(net, mark, &x->id.daddr,
                       x->id.spi, x->id.proto, family);
    else
        return __xfrm_state_lookup_byaddr(net, mark,
                          &x->id.daddr,
                          &x->props.saddr,
                          x->id.proto, family);
}

static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
{
    if (have_hash_collision &&
        (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
        net->xfrm.state_num > net->xfrm.state_hmask)
        schedule_work(&net->xfrm.state_hash_work);
}

static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
                   const struct flowi *fl, unsigned short family,
                   struct xfrm_state **best, int *acq_in_progress,
                   int *error)
{
    /* Resolution logic:
     * 1. There is a valid state with matching selector. Done.
     * 2. Valid state with inappropriate selector. Skip.
     *
     * Entering area of "sysdeps".
     *
     * 3. If state is not valid, selector is temporary, it selects
     *    only session which triggered previous resolution. Key
     *    manager will do something to install a state with proper
     *    selector.
     */
    if (x->km.state == XFRM_STATE_VALID) {
        if ((x->sel.family &&
             !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
            !security_xfrm_state_pol_flow_match(x, pol, fl))
            return;

        if (!*best ||
            (*best)->km.dying > x->km.dying ||
            ((*best)->km.dying == x->km.dying &&
             (*best)->curlft.add_time < x->curlft.add_time))
            *best = x;
    } else if (x->km.state == XFRM_STATE_ACQ) {
        *acq_in_progress = 1;
    } else if (x->km.state == XFRM_STATE_ERROR ||
           x->km.state == XFRM_STATE_EXPIRED) {
        if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
            security_xfrm_state_pol_flow_match(x, pol, fl))
            *error = -ESRCH;
    }
}

struct xfrm_state *
xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
        const struct flowi *fl, struct xfrm_tmpl *tmpl,
        struct xfrm_policy *pol, int *err,
        unsigned short family)
{
    static xfrm_address_t saddr_wildcard = { };
    struct net *net = xp_net(pol);
    unsigned int h, h_wildcard;
    struct hlist_node *entry;
    struct xfrm_state *x, *x0, *to_put;
    int acquire_in_progress = 0;
    int error = 0;
    struct xfrm_state *best = NULL;
    u32 mark = pol->mark.v & pol->mark.m;
    unsigned short encap_family = tmpl->encap_family;

    to_put = NULL;

    spin_lock_bh(&xfrm_state_lock);
    h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
    hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
        if (x->props.family == encap_family &&
            x->props.reqid == tmpl->reqid &&
            (mark & x->mark.m) == x->mark.v &&
            !(x->props.flags & XFRM_STATE_WILDRECV) &&
            xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
            tmpl->mode == x->props.mode &&
            tmpl->id.proto == x->id.proto &&
            (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
            xfrm_state_look_at(pol, x, fl, encap_family,
                       &best, &acquire_in_progress, &error);
    }
    if (best)
        goto found;

    h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
    hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
        if (x->props.family == encap_family &&
            x->props.reqid == tmpl->reqid &&
            (mark & x->mark.m) == x->mark.v &&
            !(x->props.flags & XFRM_STATE_WILDRECV) &&
            xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
            tmpl->mode == x->props.mode &&
            tmpl->id.proto == x->id.proto &&
            (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
            xfrm_state_look_at(pol, x, fl, encap_family,
                       &best, &acquire_in_progress, &error);
    }

found:
    x = best;
    if (!x && !error && !acquire_in_progress) {
        if (tmpl->id.spi &&
            (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
                          tmpl->id.proto, encap_family)) != NULL) {
            to_put = x0;
            error = -EEXIST;
            goto out;
        }
        x = xfrm_state_alloc(net);
        if (x == NULL) {
            error = -ENOMEM;
            goto out;
        }
        /* Initialize temporary state matching only
         * to current session. */
        xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
        memcpy(&x->mark, &pol->mark, sizeof(x->mark));

        error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
        if (error) {
            x->km.state = XFRM_STATE_DEAD;
            to_put = x;
            x = NULL;
            goto out;
        }

        if (km_query(x, tmpl, pol) == 0) {
            x->km.state = XFRM_STATE_ACQ;
            list_add(&x->km.all, &net->xfrm.state_all);
            hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
            h = xfrm_src_hash(net, daddr, saddr, encap_family);
            hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
            if (x->id.spi) {
                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
            }
            x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
            tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
            net->xfrm.state_num++;
            xfrm_hash_grow_check(net, x->bydst.next != NULL);
        } else {
            x->km.state = XFRM_STATE_DEAD;
            to_put = x;
            x = NULL;
            error = -ESRCH;
        }
    }
out:
    if (x)
        xfrm_state_hold(x);
    else
        *err = acquire_in_progress ? -EAGAIN : error;
    spin_unlock_bh(&xfrm_state_lock);
    if (to_put)
        xfrm_state_put(to_put);
    return x;
}

struct xfrm_state *
xfrm_stateonly_find(struct net *net, u32 mark,
            xfrm_address_t *daddr, xfrm_address_t *saddr,
            unsigned short family, u8 mode, u8 proto, u32 reqid)
{
    unsigned int h;
    struct xfrm_state *rx = NULL, *x = NULL;
    struct hlist_node *entry;

    spin_lock(&xfrm_state_lock);
    h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
    hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
        if (x->props.family == family &&
            x->props.reqid == reqid &&
            (mark & x->mark.m) == x->mark.v &&
            !(x->props.flags & XFRM_STATE_WILDRECV) &&
            xfrm_state_addr_check(x, daddr, saddr, family) &&
            mode == x->props.mode &&
            proto == x->id.proto &&
            x->km.state == XFRM_STATE_VALID) {
            rx = x;
            break;
        }
    }

    if (rx)
        xfrm_state_hold(rx);
    spin_unlock(&xfrm_state_lock);


    return rx;
}
EXPORT_SYMBOL(xfrm_stateonly_find);

static void __xfrm_state_insert(struct xfrm_state *x)
{
    struct net *net = xs_net(x);
    unsigned int h;

    list_add(&x->km.all, &net->xfrm.state_all);

    h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
              x->props.reqid, x->props.family);
    hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);

    h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
    hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);

    if (x->id.spi) {
        h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
                  x->props.family);

        hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
    }

    tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
    if (x->replay_maxage)
        mod_timer(&x->rtimer, jiffies + x->replay_maxage);

    wake_up(&net->xfrm.km_waitq);

    net->xfrm.state_num++;

    xfrm_hash_grow_check(net, x->bydst.next != NULL);
}

/* xfrm_state_lock is held */
static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
{
    struct net *net = xs_net(xnew);
    unsigned short family = xnew->props.family;
    u32 reqid = xnew->props.reqid;
    struct xfrm_state *x;
    struct hlist_node *entry;
    unsigned int h;
    u32 mark = xnew->mark.v & xnew->mark.m;

    h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
    hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
        if (x->props.family == family &&
            x->props.reqid  == reqid &&
            (mark & x->mark.m) == x->mark.v &&
            !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
            !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
            x->genid++;
    }
}

void xfrm_state_insert(struct xfrm_state *x)
{
    spin_lock_bh(&xfrm_state_lock);
    __xfrm_state_bump_genids(x);
    __xfrm_state_insert(x);
    spin_unlock_bh(&xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_state_insert);

/* xfrm_state_lock is held */
static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
                      unsigned short family, u8 mode,
                      u32 reqid, u8 proto,
                      const xfrm_address_t *daddr,
                      const xfrm_address_t *saddr, int create)
{
    unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
    struct hlist_node *entry;
    struct xfrm_state *x;
    u32 mark = m->v & m->m;

    hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
        if (x->props.reqid  != reqid ||
            x->props.mode   != mode ||
            x->props.family != family ||
            x->km.state     != XFRM_STATE_ACQ ||
            x->id.spi       != 0 ||
            x->id.proto     != proto ||
            (mark & x->mark.m) != x->mark.v ||
            xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
            xfrm_addr_cmp(&x->props.saddr, saddr, family))
            continue;

        xfrm_state_hold(x);
        return x;
    }

    if (!create)
        return NULL;

    x = xfrm_state_alloc(net);
    if (likely(x)) {
        switch (family) {
        case AF_INET:
            x->sel.daddr.a4 = daddr->a4;
            x->sel.saddr.a4 = saddr->a4;
            x->sel.prefixlen_d = 32;
            x->sel.prefixlen_s = 32;
            x->props.saddr.a4 = saddr->a4;
            x->id.daddr.a4 = daddr->a4;
            break;

        case AF_INET6:
            *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
            *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
            x->sel.prefixlen_d = 128;
            x->sel.prefixlen_s = 128;
            *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
            *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
            break;
        }

        x->km.state = XFRM_STATE_ACQ;
        x->id.proto = proto;
        x->props.family = family;
        x->props.mode = mode;
        x->props.reqid = reqid;
        x->mark.v = m->v;
        x->mark.m = m->m;
        x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
        xfrm_state_hold(x);
        tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
        list_add(&x->km.all, &net->xfrm.state_all);
        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
        h = xfrm_src_hash(net, daddr, saddr, family);
        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);

        net->xfrm.state_num++;

        xfrm_hash_grow_check(net, x->bydst.next != NULL);
    }

    return x;
}

static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);

int xfrm_state_add(struct xfrm_state *x)
{
    struct net *net = xs_net(x);
    struct xfrm_state *x1, *to_put;
    int family;
    int err;
    u32 mark = x->mark.v & x->mark.m;
    int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);

    family = x->props.family;

    to_put = NULL;

    spin_lock_bh(&xfrm_state_lock);

    x1 = __xfrm_state_locate(x, use_spi, family);
    if (x1) {
        to_put = x1;
        x1 = NULL;
        err = -EEXIST;
        goto out;
    }

    if (use_spi && x->km.seq) {
        x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
        if (x1 && ((x1->id.proto != x->id.proto) ||
            xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
            to_put = x1;
            x1 = NULL;
        }
    }

    if (use_spi && !x1)
        x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
                     x->props.reqid, x->id.proto,
                     &x->id.daddr, &x->props.saddr, 0);

    __xfrm_state_bump_genids(x);
    __xfrm_state_insert(x);
    err = 0;

out:
    spin_unlock_bh(&xfrm_state_lock);

    if (x1) {
        xfrm_state_delete(x1);
        xfrm_state_put(x1);
    }

    if (to_put)
        xfrm_state_put(to_put);

    return err;
}
EXPORT_SYMBOL(xfrm_state_add);

#ifdef CONFIG_XFRM_MIGRATE
static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
{
    struct net *net = xs_net(orig);
    int err = -ENOMEM;
    struct xfrm_state *x = xfrm_state_alloc(net);
    if (!x)
        goto out;

    memcpy(&x->id, &orig->id, sizeof(x->id));
    memcpy(&x->sel, &orig->sel, sizeof(x->sel));
    memcpy(&x->lft, &orig->lft, sizeof(x->lft));
    x->props.mode = orig->props.mode;
    x->props.replay_window = orig->props.replay_window;
    x->props.reqid = orig->props.reqid;
    x->props.family = orig->props.family;
    x->props.saddr = orig->props.saddr;

    if (orig->aalg) {
        x->aalg = xfrm_algo_auth_clone(orig->aalg);
        if (!x->aalg)
            goto error;
    }
    x->props.aalgo = orig->props.aalgo;

    if (orig->ealg) {
        x->ealg = xfrm_algo_clone(orig->ealg);
        if (!x->ealg)
            goto error;
    }
    x->props.ealgo = orig->props.ealgo;

    if (orig->calg) {
        x->calg = xfrm_algo_clone(orig->calg);
        if (!x->calg)
            goto error;
    }
    x->props.calgo = orig->props.calgo;

    if (orig->encap) {
        x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
        if (!x->encap)
            goto error;
    }

    if (orig->coaddr) {
        x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
                    GFP_KERNEL);
        if (!x->coaddr)
            goto error;
    }

    if (orig->replay_esn) {
        err = xfrm_replay_clone(x, orig);
        if (err)
            goto error;
    }

    memcpy(&x->mark, &orig->mark, sizeof(x->mark));

    err = xfrm_init_state(x);
    if (err)
        goto error;

    x->props.flags = orig->props.flags;

    x->curlft.add_time = orig->curlft.add_time;
    x->km.state = orig->km.state;
    x->km.seq = orig->km.seq;

    return x;

 error:
    xfrm_state_put(x);
out:
    if (errp)
        *errp = err;
    return NULL;
}

/* xfrm_state_lock is held */
struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
{
    unsigned int h;
    struct xfrm_state *x;
    struct hlist_node *entry;

    if (m->reqid) {
        h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
                  m->reqid, m->old_family);
        hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
            if (x->props.mode != m->mode ||
                x->id.proto != m->proto)
                continue;
            if (m->reqid && x->props.reqid != m->reqid)
                continue;
            if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
                      m->old_family) ||
                xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
                      m->old_family))
                continue;
            xfrm_state_hold(x);
            return x;
        }
    } else {
        h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
                  m->old_family);
        hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
            if (x->props.mode != m->mode ||
                x->id.proto != m->proto)
                continue;
            if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
                      m->old_family) ||
                xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
                      m->old_family))
                continue;
            xfrm_state_hold(x);
            return x;
        }
    }

    return NULL;
}
EXPORT_SYMBOL(xfrm_migrate_state_find);

struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
                       struct xfrm_migrate *m)
{
    struct xfrm_state *xc;
    int err;

    xc = xfrm_state_clone(x, &err);
    if (!xc)
        return NULL;

    memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
    memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));

    /* add state */
    if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
        /* a care is needed when the destination address of the
           state is to be updated as it is a part of triplet */
        xfrm_state_insert(xc);
    } else {
        if ((err = xfrm_state_add(xc)) < 0)
            goto error;
    }

    return xc;
error:
    xfrm_state_put(xc);
    return NULL;
}
EXPORT_SYMBOL(xfrm_state_migrate);
#endif

int xfrm_state_update(struct xfrm_state *x)
{
    struct xfrm_state *x1, *to_put;
    int err;
    int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);

    to_put = NULL;

    spin_lock_bh(&xfrm_state_lock);
    x1 = __xfrm_state_locate(x, use_spi, x->props.family);

    err = -ESRCH;
    if (!x1)
        goto out;

    if (xfrm_state_kern(x1)) {
        to_put = x1;
        err = -EEXIST;
        goto out;
    }

    if (x1->km.state == XFRM_STATE_ACQ) {
        __xfrm_state_insert(x);
        x = NULL;
    }
    err = 0;

out:
    spin_unlock_bh(&xfrm_state_lock);

    if (to_put)
        xfrm_state_put(to_put);

    if (err)
        return err;

    if (!x) {
        xfrm_state_delete(x1);
        xfrm_state_put(x1);
        return 0;
    }

    err = -EINVAL;
    spin_lock_bh(&x1->lock);
    if (likely(x1->km.state == XFRM_STATE_VALID)) {
        if (x->encap && x1->encap)
            memcpy(x1->encap, x->encap, sizeof(*x1->encap));
        if (x->coaddr && x1->coaddr) {
            memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
        }
        if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
            memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
        memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
        x1->km.dying = 0;

        tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
        if (x1->curlft.use_time)
            xfrm_state_check_expire(x1);

        err = 0;
        x->km.state = XFRM_STATE_DEAD;
        __xfrm_state_put(x);
    }
    spin_unlock_bh(&x1->lock);

    xfrm_state_put(x1);

    return err;
}
EXPORT_SYMBOL(xfrm_state_update);

int xfrm_state_check_expire(struct xfrm_state *x)
{
    if (!x->curlft.use_time)
        x->curlft.use_time = get_seconds();

    if (x->km.state != XFRM_STATE_VALID)
        return -EINVAL;

    if (x->curlft.bytes >= x->lft.hard_byte_limit ||
        x->curlft.packets >= x->lft.hard_packet_limit) {
        x->km.state = XFRM_STATE_EXPIRED;
        tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
        return -EINVAL;
    }

    if (!x->km.dying &&
        (x->curlft.bytes >= x->lft.soft_byte_limit ||
         x->curlft.packets >= x->lft.soft_packet_limit)) {
        x->km.dying = 1;
        km_state_expired(x, 0, 0);
    }
    return 0;
}
EXPORT_SYMBOL(xfrm_state_check_expire);

struct xfrm_state *
xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
          u8 proto, unsigned short family)
{
    struct xfrm_state *x;

    spin_lock_bh(&xfrm_state_lock);
    x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
    spin_unlock_bh(&xfrm_state_lock);
    return x;
}
EXPORT_SYMBOL(xfrm_state_lookup);

struct xfrm_state *
xfrm_state_lookup_byaddr(struct net *net, u32 mark,
             const xfrm_address_t *daddr, const xfrm_address_t *saddr,
             u8 proto, unsigned short family)
{
    struct xfrm_state *x;

    spin_lock_bh(&xfrm_state_lock);
    x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
    spin_unlock_bh(&xfrm_state_lock);
    return x;
}
EXPORT_SYMBOL(xfrm_state_lookup_byaddr);

struct xfrm_state *
xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
          int create, unsigned short family)
{
    struct xfrm_state *x;

    spin_lock_bh(&xfrm_state_lock);
    x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
    spin_unlock_bh(&xfrm_state_lock);

    return x;
}
EXPORT_SYMBOL(xfrm_find_acq);

#ifdef CONFIG_XFRM_SUB_POLICY
int
xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
           unsigned short family)
{
    int err = 0;
    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
    if (!afinfo)
        return -EAFNOSUPPORT;

    spin_lock_bh(&xfrm_state_lock);
    if (afinfo->tmpl_sort)
        err = afinfo->tmpl_sort(dst, src, n);
    spin_unlock_bh(&xfrm_state_lock);
    xfrm_state_put_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_tmpl_sort);

int
xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
        unsigned short family)
{
    int err = 0;
    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
    if (!afinfo)
        return -EAFNOSUPPORT;

    spin_lock_bh(&xfrm_state_lock);
    if (afinfo->state_sort)
        err = afinfo->state_sort(dst, src, n);
    spin_unlock_bh(&xfrm_state_lock);
    xfrm_state_put_afinfo(afinfo);
    return err;
}
EXPORT_SYMBOL(xfrm_state_sort);
#endif

/* Silly enough, but I'm lazy to build resolution list */

static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
{
    int i;

    for (i = 0; i <= net->xfrm.state_hmask; i++) {
        struct hlist_node *entry;
        struct xfrm_state *x;

        hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
            if (x->km.seq == seq &&
                (mark & x->mark.m) == x->mark.v &&
                x->km.state == XFRM_STATE_ACQ) {
                xfrm_state_hold(x);
                return x;
            }
        }
    }
    return NULL;
}

struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
{
    struct xfrm_state *x;

    spin_lock_bh(&xfrm_state_lock);
    x = __xfrm_find_acq_byseq(net, mark, seq);
    spin_unlock_bh(&xfrm_state_lock);
    return x;
}
EXPORT_SYMBOL(xfrm_find_acq_byseq);

u32 xfrm_get_acqseq(void)
{
    u32 res;
    static atomic_t acqseq;

    do {
        res = atomic_inc_return(&acqseq);
    } while (!res);

    return res;
}
EXPORT_SYMBOL(xfrm_get_acqseq);

int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
{
    struct net *net = xs_net(x);
    unsigned int h;
    struct xfrm_state *x0;
    int err = -ENOENT;
    __be32 minspi = htonl(low);
    __be32 maxspi = htonl(high);
    u32 mark = x->mark.v & x->mark.m;

    spin_lock_bh(&x->lock);
    if (x->km.state == XFRM_STATE_DEAD)
        goto unlock;

    err = 0;
    if (x->id.spi)
        goto unlock;

    err = -ENOENT;

    if (minspi == maxspi) {
        x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
        if (x0) {
            xfrm_state_put(x0);
            goto unlock;
        }
        x->id.spi = minspi;
    } else {
        u32 spi = 0;
        for (h=0; h<high-low+1; h++) {
            spi = low + net_random()%(high-low+1);
            x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
            if (x0 == NULL) {
                x->id.spi = htonl(spi);
                break;
            }
            xfrm_state_put(x0);
        }
    }
    if (x->id.spi) {
        spin_lock_bh(&xfrm_state_lock);
        h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
        hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
        spin_unlock_bh(&xfrm_state_lock);

        err = 0;
    }

unlock:
    spin_unlock_bh(&x->lock);

    return err;
}
EXPORT_SYMBOL(xfrm_alloc_spi);

int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
            int (*func)(struct xfrm_state *, int, void*),
            void *data)
{
    struct xfrm_state *state;
    struct xfrm_state_walk *x;
    int err = 0;

    if (walk->seq != 0 && list_empty(&walk->all))
        return 0;

    spin_lock_bh(&xfrm_state_lock);
    if (list_empty(&walk->all))
        x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
    else
        x = list_entry(&walk->all, struct xfrm_state_walk, all);
    list_for_each_entry_from(x, &net->xfrm.state_all, all) {
        if (x->state == XFRM_STATE_DEAD)
            continue;
        state = container_of(x, struct xfrm_state, km);
        if (!xfrm_id_proto_match(state->id.proto, walk->proto))
            continue;
        err = func(state, walk->seq, data);
        if (err) {
            list_move_tail(&walk->all, &x->all);
            goto out;
        }
        walk->seq++;
    }
    if (walk->seq == 0) {
        err = -ENOENT;
        goto out;
    }
    list_del_init(&walk->all);
out:
    spin_unlock_bh(&xfrm_state_lock);
    return err;
}
EXPORT_SYMBOL(xfrm_state_walk);

void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
{
    INIT_LIST_HEAD(&walk->all);
    walk->proto = proto;
    walk->state = XFRM_STATE_DEAD;
    walk->seq = 0;
}
EXPORT_SYMBOL(xfrm_state_walk_init);

void xfrm_state_walk_done(struct xfrm_state_walk *walk)
{
    if (list_empty(&walk->all))
        return;

    spin_lock_bh(&xfrm_state_lock);
    list_del(&walk->all);
    spin_unlock_bh(&xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_state_walk_done);

static void xfrm_replay_timer_handler(unsigned long data)
{
    struct xfrm_state *x = (struct xfrm_state*)data;

    spin_lock(&x->lock);

    if (x->km.state == XFRM_STATE_VALID) {
        if (xfrm_aevent_is_on(xs_net(x)))
            x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
        else
            x->xflags |= XFRM_TIME_DEFER;
    }

    spin_unlock(&x->lock);
}

static LIST_HEAD(xfrm_km_list);
static DEFINE_RWLOCK(xfrm_km_lock);

void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
{
    struct xfrm_mgr *km;

    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list)
        if (km->notify_policy)
            km->notify_policy(xp, dir, c);
    read_unlock(&xfrm_km_lock);
}

void km_state_notify(struct xfrm_state *x, const struct km_event *c)
{
    struct xfrm_mgr *km;
    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list)
        if (km->notify)
            km->notify(x, c);
    read_unlock(&xfrm_km_lock);
}

EXPORT_SYMBOL(km_policy_notify);
EXPORT_SYMBOL(km_state_notify);

void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
{
    struct net *net = xs_net(x);
    struct km_event c;

    c.data.hard = hard;
    c.portid = portid;
    c.event = XFRM_MSG_EXPIRE;
    km_state_notify(x, &c);

    if (hard)
        wake_up(&net->xfrm.km_waitq);
}

EXPORT_SYMBOL(km_state_expired);
/*
 * We send to all registered managers regardless of failure
 * We are happy with one success
*/
int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
{
    int err = -EINVAL, acqret;
    struct xfrm_mgr *km;

    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list) {
        acqret = km->acquire(x, t, pol);
        if (!acqret)
            err = acqret;
    }
    read_unlock(&xfrm_km_lock);
    return err;
}
EXPORT_SYMBOL(km_query);

int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
{
    int err = -EINVAL;
    struct xfrm_mgr *km;

    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list) {
        if (km->new_mapping)
            err = km->new_mapping(x, ipaddr, sport);
        if (!err)
            break;
    }
    read_unlock(&xfrm_km_lock);
    return err;
}
EXPORT_SYMBOL(km_new_mapping);

void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
{
    struct net *net = xp_net(pol);
    struct km_event c;

    c.data.hard = hard;
    c.portid = portid;
    c.event = XFRM_MSG_POLEXPIRE;
    km_policy_notify(pol, dir, &c);

    if (hard)
        wake_up(&net->xfrm.km_waitq);
}
EXPORT_SYMBOL(km_policy_expired);

#ifdef CONFIG_XFRM_MIGRATE
int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
           const struct xfrm_migrate *m, int num_migrate,
           const struct xfrm_kmaddress *k)
{
    int err = -EINVAL;
    int ret;
    struct xfrm_mgr *km;

    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list) {
        if (km->migrate) {
            ret = km->migrate(sel, dir, type, m, num_migrate, k);
            if (!ret)
                err = ret;
        }
    }
    read_unlock(&xfrm_km_lock);
    return err;
}
EXPORT_SYMBOL(km_migrate);
#endif

int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
{
    int err = -EINVAL;
    int ret;
    struct xfrm_mgr *km;

    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list) {
        if (km->report) {
            ret = km->report(net, proto, sel, addr);
            if (!ret)
                err = ret;
        }
    }
    read_unlock(&xfrm_km_lock);
    return err;
}
EXPORT_SYMBOL(km_report);

int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
{
    int err;
    u8 *data;
    struct xfrm_mgr *km;
    struct xfrm_policy *pol = NULL;

    if (optlen <= 0 || optlen > PAGE_SIZE)
        return -EMSGSIZE;

    data = kmalloc(optlen, GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    err = -EFAULT;
    if (copy_from_user(data, optval, optlen))
        goto out;

    err = -EINVAL;
    read_lock(&xfrm_km_lock);
    list_for_each_entry(km, &xfrm_km_list, list) {
        pol = km->compile_policy(sk, optname, data,
                     optlen, &err);
        if (err >= 0)
            break;
    }
    read_unlock(&xfrm_km_lock);

    if (err >= 0) {
        xfrm_sk_policy_insert(sk, err, pol);
        xfrm_pol_put(pol);
        err = 0;
    }

out:
    kfree(data);
    return err;
}
EXPORT_SYMBOL(xfrm_user_policy);

int xfrm_register_km(struct xfrm_mgr *km)
{
    write_lock_bh(&xfrm_km_lock);
    list_add_tail(&km->list, &xfrm_km_list);
    write_unlock_bh(&xfrm_km_lock);
    return 0;
}
EXPORT_SYMBOL(xfrm_register_km);

int xfrm_unregister_km(struct xfrm_mgr *km)
{
    write_lock_bh(&xfrm_km_lock);
    list_del(&km->list);
    write_unlock_bh(&xfrm_km_lock);
    return 0;
}
EXPORT_SYMBOL(xfrm_unregister_km);

int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
{
    int err = 0;
    if (unlikely(afinfo == NULL))
        return -EINVAL;
    if (unlikely(afinfo->family >= NPROTO))
        return -EAFNOSUPPORT;
    write_lock_bh(&xfrm_state_afinfo_lock);
    if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
        err = -ENOBUFS;
    else
        xfrm_state_afinfo[afinfo->family] = afinfo;
    write_unlock_bh(&xfrm_state_afinfo_lock);
    return err;
}
EXPORT_SYMBOL(xfrm_state_register_afinfo);

int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
{
    int err = 0;
    if (unlikely(afinfo == NULL))
        return -EINVAL;
    if (unlikely(afinfo->family >= NPROTO))
        return -EAFNOSUPPORT;
    write_lock_bh(&xfrm_state_afinfo_lock);
    if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
        if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
            err = -EINVAL;
        else
            xfrm_state_afinfo[afinfo->family] = NULL;
    }
    write_unlock_bh(&xfrm_state_afinfo_lock);
    return err;
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);

static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
    struct xfrm_state_afinfo *afinfo;
    if (unlikely(family >= NPROTO))
        return NULL;
    read_lock(&xfrm_state_afinfo_lock);
    afinfo = xfrm_state_afinfo[family];
    if (unlikely(!afinfo))
        read_unlock(&xfrm_state_afinfo_lock);
    return afinfo;
}

static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
    __releases(xfrm_state_afinfo_lock)
{
    read_unlock(&xfrm_state_afinfo_lock);
}

/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
void xfrm_state_delete_tunnel(struct xfrm_state *x)
{
    if (x->tunnel) {
        struct xfrm_state *t = x->tunnel;

        if (atomic_read(&t->tunnel_users) == 2)
            xfrm_state_delete(t);
        atomic_dec(&t->tunnel_users);
        xfrm_state_put(t);
        x->tunnel = NULL;
    }
}
EXPORT_SYMBOL(xfrm_state_delete_tunnel);

int xfrm_state_mtu(struct xfrm_state *x, int mtu)
{
    int res;

    spin_lock_bh(&x->lock);
    if (x->km.state == XFRM_STATE_VALID &&
        x->type && x->type->get_mtu)
        res = x->type->get_mtu(x, mtu);
    else
        res = mtu - x->props.header_len;
    spin_unlock_bh(&x->lock);
    return res;
}

int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
{
    struct xfrm_state_afinfo *afinfo;
    struct xfrm_mode *inner_mode;
    int family = x->props.family;
    int err;

    err = -EAFNOSUPPORT;
    afinfo = xfrm_state_get_afinfo(family);
    if (!afinfo)
        goto error;

    err = 0;
    if (afinfo->init_flags)
        err = afinfo->init_flags(x);

    xfrm_state_put_afinfo(afinfo);

    if (err)
        goto error;

    err = -EPROTONOSUPPORT;

    if (x->sel.family != AF_UNSPEC) {
        inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
        if (inner_mode == NULL)
            goto error;

        if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
            family != x->sel.family) {
            xfrm_put_mode(inner_mode);
            goto error;
        }

        x->inner_mode = inner_mode;
    } else {
        struct xfrm_mode *inner_mode_iaf;
        int iafamily = AF_INET;

        inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
        if (inner_mode == NULL)
            goto error;

        if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
            xfrm_put_mode(inner_mode);
            goto error;
        }
        x->inner_mode = inner_mode;

        if (x->props.family == AF_INET)
            iafamily = AF_INET6;

        inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
        if (inner_mode_iaf) {
            if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
                x->inner_mode_iaf = inner_mode_iaf;
            else
                xfrm_put_mode(inner_mode_iaf);
        }
    }

    x->type = xfrm_get_type(x->id.proto, family);
    if (x->type == NULL)
        goto error;

    err = x->type->init_state(x);
    if (err)
        goto error;

    x->outer_mode = xfrm_get_mode(x->props.mode, family);
    if (x->outer_mode == NULL) {
        err = -EPROTONOSUPPORT;
        goto error;
    }

    if (init_replay) {
        err = xfrm_init_replay(x);
        if (err)
            goto error;
    }

    x->km.state = XFRM_STATE_VALID;

error:
    return err;
}

EXPORT_SYMBOL(__xfrm_init_state);

int xfrm_init_state(struct xfrm_state *x)
{
    return __xfrm_init_state(x, true);
}

EXPORT_SYMBOL(xfrm_init_state);

int __net_init xfrm_state_init(struct net *net)
{
    unsigned int sz;

    INIT_LIST_HEAD(&net->xfrm.state_all);

    sz = sizeof(struct hlist_head) * 8;

    net->xfrm.state_bydst = xfrm_hash_alloc(sz);
    if (!net->xfrm.state_bydst)
        goto out_bydst;
    net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
    if (!net->xfrm.state_bysrc)
        goto out_bysrc;
    net->xfrm.state_byspi = xfrm_hash_alloc(sz);
    if (!net->xfrm.state_byspi)
        goto out_byspi;
    net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);

    net->xfrm.state_num = 0;
    INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
    INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
    INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
    init_waitqueue_head(&net->xfrm.km_waitq);
    return 0;

out_byspi:
    xfrm_hash_free(net->xfrm.state_bysrc, sz);
out_bysrc:
    xfrm_hash_free(net->xfrm.state_bydst, sz);
out_bydst:
    return -ENOMEM;
}

void xfrm_state_fini(struct net *net)
{
    struct xfrm_audit audit_info;
    unsigned int sz;

    flush_work(&net->xfrm.state_hash_work);
    audit_info.loginuid = INVALID_UID;
    audit_info.sessionid = -1;
    audit_info.secid = 0;
    xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
    flush_work(&net->xfrm.state_gc_work);

    WARN_ON(!list_empty(&net->xfrm.state_all));

    sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
    WARN_ON(!hlist_empty(net->xfrm.state_byspi));
    xfrm_hash_free(net->xfrm.state_byspi, sz);
    WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
    xfrm_hash_free(net->xfrm.state_bysrc, sz);
    WARN_ON(!hlist_empty(net->xfrm.state_bydst));
    xfrm_hash_free(net->xfrm.state_bydst, sz);
}

#ifdef CONFIG_AUDITSYSCALL
static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
                     struct audit_buffer *audit_buf)
{
    struct xfrm_sec_ctx *ctx = x->security;
    u32 spi = ntohl(x->id.spi);

    if (ctx)
        audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
                 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);

    switch(x->props.family) {
    case AF_INET:
        audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
                 &x->props.saddr.a4, &x->id.daddr.a4);
        break;
    case AF_INET6:
        audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
                 x->props.saddr.a6, x->id.daddr.a6);
        break;
    }

    audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
}

static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
                      struct audit_buffer *audit_buf)
{
    const struct iphdr *iph4;
    const struct ipv6hdr *iph6;

    switch (family) {
    case AF_INET:
        iph4 = ip_hdr(skb);
        audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
                 &iph4->saddr, &iph4->daddr);
        break;
    case AF_INET6:
        iph6 = ipv6_hdr(skb);
        audit_log_format(audit_buf,
                 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
                 &iph6->saddr,&iph6->daddr,
                 iph6->flow_lbl[0] & 0x0f,
                 iph6->flow_lbl[1],
                 iph6->flow_lbl[2]);
        break;
    }
}

void xfrm_audit_state_add(struct xfrm_state *x, int result,
              kuid_t auid, u32 sessionid, u32 secid)
{
    struct audit_buffer *audit_buf;

    audit_buf = xfrm_audit_start("SAD-add");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
    xfrm_audit_helper_sainfo(x, audit_buf);
    audit_log_format(audit_buf, " res=%u", result);
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_add);

void xfrm_audit_state_delete(struct xfrm_state *x, int result,
                 kuid_t auid, u32 sessionid, u32 secid)
{
    struct audit_buffer *audit_buf;

    audit_buf = xfrm_audit_start("SAD-delete");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
    xfrm_audit_helper_sainfo(x, audit_buf);
    audit_log_format(audit_buf, " res=%u", result);
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);

void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
                      struct sk_buff *skb)
{
    struct audit_buffer *audit_buf;
    u32 spi;

    audit_buf = xfrm_audit_start("SA-replay-overflow");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
    /* don't record the sequence number because it's inherent in this kind
     * of audit message */
    spi = ntohl(x->id.spi);
    audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);

void xfrm_audit_state_replay(struct xfrm_state *x,
                 struct sk_buff *skb, __be32 net_seq)
{
    struct audit_buffer *audit_buf;
    u32 spi;

    audit_buf = xfrm_audit_start("SA-replayed-pkt");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
    spi = ntohl(x->id.spi);
    audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
             spi, spi, ntohl(net_seq));
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);

void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
{
    struct audit_buffer *audit_buf;

    audit_buf = xfrm_audit_start("SA-notfound");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_pktinfo(skb, family, audit_buf);
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);

void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
                   __be32 net_spi, __be32 net_seq)
{
    struct audit_buffer *audit_buf;
    u32 spi;

    audit_buf = xfrm_audit_start("SA-notfound");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_pktinfo(skb, family, audit_buf);
    spi = ntohl(net_spi);
    audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
             spi, spi, ntohl(net_seq));
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);

void xfrm_audit_state_icvfail(struct xfrm_state *x,
                  struct sk_buff *skb, u8 proto)
{
    struct audit_buffer *audit_buf;
    __be32 net_spi;
    __be32 net_seq;

    audit_buf = xfrm_audit_start("SA-icv-failure");
    if (audit_buf == NULL)
        return;
    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
    if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
        u32 spi = ntohl(net_spi);
        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
                 spi, spi, ntohl(net_seq));
    }
    audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
#endif /* CONFIG_AUDITSYSCALL */