text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * xfrm_state.c
   *
   * Changes:
   *	Mitsuru KANDA @USAGI
   * 	Kazunori MIYAZAWA @USAGI
   * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   * 		IPv6 support
   * 	YOSHIFUJI Hideaki @USAGI
   * 		Split up af-specific functions
   *	Derek Atkins <derek@ihtfp.com>
   *		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 <linux/uaccess.h>
  #include <linux/ktime.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/kernel.h>
  
  #include <crypto/aead.h>
  
  #include "xfrm_hash.h"
  
  #define xfrm_state_deref_prot(table, net) \
  	rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  
  static void xfrm_state_gc_task(struct work_struct *work);
  
  /* 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 unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  static struct kmem_cache *xfrm_state_cache __ro_after_init;
  
  static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  static HLIST_HEAD(xfrm_state_gc_list);
  
  static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  {
  	return refcount_inc_not_zero(&x->refcnt);
  }
  
  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 *tmp;
  	struct xfrm_state *x;
  
  	hlist_for_each_entry_safe(x, 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_rcu(&x->bydst, ndsttable + h);
  
  		h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  				    x->props.family,
  				    nhashmask);
  		hlist_add_head_rcu(&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_rcu(&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 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;
  
  	nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
  	ndst = xfrm_hash_alloc(nsize);
  	if (!ndst)
  		return;
  	nsrc = xfrm_hash_alloc(nsize);
  	if (!nsrc) {
  		xfrm_hash_free(ndst, nsize);
  		return;
  	}
  	nspi = xfrm_hash_alloc(nsize);
  	if (!nspi) {
  		xfrm_hash_free(ndst, nsize);
  		xfrm_hash_free(nsrc, nsize);
  		return;
  	}
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
  
  	nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
  	odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
  	for (i = net->xfrm.state_hmask; i >= 0; i--)
  		xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
  
  	osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
  	ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
  	ohashmask = net->xfrm.state_hmask;
  
  	rcu_assign_pointer(net->xfrm.state_bydst, ndst);
  	rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
  	rcu_assign_pointer(net->xfrm.state_byspi, nspi);
  	net->xfrm.state_hmask = nhashmask;
  
  	write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  
  	osize = (ohashmask + 1) * sizeof(struct hlist_head);
  
  	synchronize_rcu();
  
  	xfrm_hash_free(odst, osize);
  	xfrm_hash_free(osrc, osize);
  	xfrm_hash_free(ospi, osize);
  }
  
  static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
  static struct xfrm_state_afinfo __rcu *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);
  static bool km_is_alive(const struct km_event *c);
  void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
  
  int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
  {
  	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
  	int err = 0;
  
  	if (!afinfo)
  		return -EAFNOSUPPORT;
  
  #define X(afi, T, name) do {			\
  		WARN_ON((afi)->type_ ## name);	\
  		(afi)->type_ ## name = (T);	\
  	} while (0)
  
  	switch (type->proto) {
  	case IPPROTO_COMP:
  		X(afinfo, type, comp);
  		break;
  	case IPPROTO_AH:
  		X(afinfo, type, ah);
  		break;
  	case IPPROTO_ESP:
  		X(afinfo, type, esp);
  		break;
  	case IPPROTO_IPIP:
  		X(afinfo, type, ipip);
  		break;
  	case IPPROTO_DSTOPTS:
  		X(afinfo, type, dstopts);
  		break;
  	case IPPROTO_ROUTING:
  		X(afinfo, type, routing);
  		break;
  	case IPPROTO_IPV6:
  		X(afinfo, type, ipip6);
  		break;
  	default:
  		WARN_ON(1);
  		err = -EPROTONOSUPPORT;
  		break;
  	}
  #undef X
  	rcu_read_unlock();
  	return err;
  }
  EXPORT_SYMBOL(xfrm_register_type);
  
  void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
  {
  	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
  
  	if (unlikely(afinfo == NULL))
  		return;
  
  #define X(afi, T, name) do {				\
  		WARN_ON((afi)->type_ ## name != (T));	\
  		(afi)->type_ ## name = NULL;		\
  	} while (0)
  
  	switch (type->proto) {
  	case IPPROTO_COMP:
  		X(afinfo, type, comp);
  		break;
  	case IPPROTO_AH:
  		X(afinfo, type, ah);
  		break;
  	case IPPROTO_ESP:
  		X(afinfo, type, esp);
  		break;
  	case IPPROTO_IPIP:
  		X(afinfo, type, ipip);
  		break;
  	case IPPROTO_DSTOPTS:
  		X(afinfo, type, dstopts);
  		break;
  	case IPPROTO_ROUTING:
  		X(afinfo, type, routing);
  		break;
  	case IPPROTO_IPV6:
  		X(afinfo, type, ipip6);
  		break;
  	default:
  		WARN_ON(1);
  		break;
  	}
  #undef X
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL(xfrm_unregister_type);
  
  static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
  {
  	const struct xfrm_type *type = NULL;
  	struct xfrm_state_afinfo *afinfo;
  	int modload_attempted = 0;
  
  retry:
  	afinfo = xfrm_state_get_afinfo(family);
  	if (unlikely(afinfo == NULL))
  		return NULL;
  
  	switch (proto) {
  	case IPPROTO_COMP:
  		type = afinfo->type_comp;
  		break;
  	case IPPROTO_AH:
  		type = afinfo->type_ah;
  		break;
  	case IPPROTO_ESP:
  		type = afinfo->type_esp;
  		break;
  	case IPPROTO_IPIP:
  		type = afinfo->type_ipip;
  		break;
  	case IPPROTO_DSTOPTS:
  		type = afinfo->type_dstopts;
  		break;
  	case IPPROTO_ROUTING:
  		type = afinfo->type_routing;
  		break;
  	case IPPROTO_IPV6:
  		type = afinfo->type_ipip6;
  		break;
  	default:
  		break;
  	}
  
  	if (unlikely(type && !try_module_get(type->owner)))
  		type = NULL;
  
  	rcu_read_unlock();
  
  	if (!type && !modload_attempted) {
  		request_module("xfrm-type-%d-%d", family, proto);
  		modload_attempted = 1;
  		goto retry;
  	}
  
  	return type;
  }
  
  static void xfrm_put_type(const struct xfrm_type *type)
  {
  	module_put(type->owner);
  }
  
  int xfrm_register_type_offload(const struct xfrm_type_offload *type,
  			       unsigned short family)
  {
  	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
  	int err = 0;
  
  	if (unlikely(afinfo == NULL))
  		return -EAFNOSUPPORT;
  
  	switch (type->proto) {
  	case IPPROTO_ESP:
  		WARN_ON(afinfo->type_offload_esp);
  		afinfo->type_offload_esp = type;
  		break;
  	default:
  		WARN_ON(1);
  		err = -EPROTONOSUPPORT;
  		break;
  	}
  
  	rcu_read_unlock();
  	return err;
  }
  EXPORT_SYMBOL(xfrm_register_type_offload);
  
  void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
  				  unsigned short family)
  {
  	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
  
  	if (unlikely(afinfo == NULL))
  		return;
  
  	switch (type->proto) {
  	case IPPROTO_ESP:
  		WARN_ON(afinfo->type_offload_esp != type);
  		afinfo->type_offload_esp = NULL;
  		break;
  	default:
  		WARN_ON(1);
  		break;
  	}
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL(xfrm_unregister_type_offload);
  
  static const struct xfrm_type_offload *
  xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
  {
  	const struct xfrm_type_offload *type = NULL;
  	struct xfrm_state_afinfo *afinfo;
  
  retry:
  	afinfo = xfrm_state_get_afinfo(family);
  	if (unlikely(afinfo == NULL))
  		return NULL;
  
  	switch (proto) {
  	case IPPROTO_ESP:
  		type = afinfo->type_offload_esp;
  		break;
  	default:
  		break;
  	}
  
  	if ((type && !try_module_get(type->owner)))
  		type = NULL;
  
  	rcu_read_unlock();
  
  	if (!type && try_load) {
  		request_module("xfrm-offload-%d-%d", family, proto);
  		try_load = false;
  		goto retry;
  	}
  
  	return type;
  }
  
  static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
  {
  	module_put(type->owner);
  }
  
  static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
  	[XFRM_MODE_BEET] = {
  		.encap = XFRM_MODE_BEET,
  		.flags = XFRM_MODE_FLAG_TUNNEL,
  		.family = AF_INET,
  	},
  	[XFRM_MODE_TRANSPORT] = {
  		.encap = XFRM_MODE_TRANSPORT,
  		.family = AF_INET,
  	},
  	[XFRM_MODE_TUNNEL] = {
  		.encap = XFRM_MODE_TUNNEL,
  		.flags = XFRM_MODE_FLAG_TUNNEL,
  		.family = AF_INET,
  	},
  };
  
  static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
  	[XFRM_MODE_BEET] = {
  		.encap = XFRM_MODE_BEET,
  		.flags = XFRM_MODE_FLAG_TUNNEL,
  		.family = AF_INET6,
  	},
  	[XFRM_MODE_ROUTEOPTIMIZATION] = {
  		.encap = XFRM_MODE_ROUTEOPTIMIZATION,
  		.family = AF_INET6,
  	},
  	[XFRM_MODE_TRANSPORT] = {
  		.encap = XFRM_MODE_TRANSPORT,
  		.family = AF_INET6,
  	},
  	[XFRM_MODE_TUNNEL] = {
  		.encap = XFRM_MODE_TUNNEL,
  		.flags = XFRM_MODE_FLAG_TUNNEL,
  		.family = AF_INET6,
  	},
  };
  
  static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
  {
  	const struct xfrm_mode *mode;
  
  	if (unlikely(encap >= XFRM_MODE_MAX))
  		return NULL;
  
  	switch (family) {
  	case AF_INET:
  		mode = &xfrm4_mode_map[encap];
  		if (mode->family == family)
  			return mode;
  		break;
  	case AF_INET6:
  		mode = &xfrm6_mode_map[encap];
  		if (mode->family == family)
  			return mode;
  		break;
  	default:
  		break;
  	}
  
  	return NULL;
  }
  
  void xfrm_state_free(struct xfrm_state *x)
  {
  	kmem_cache_free(xfrm_state_cache, x);
  }
  EXPORT_SYMBOL(xfrm_state_free);
  
  static void ___xfrm_state_destroy(struct xfrm_state *x)
  {
  	hrtimer_cancel(&x->mtimer);
  	del_timer_sync(&x->rtimer);
  	kfree(x->aead);
  	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->type_offload)
  		xfrm_put_type_offload(x->type_offload);
  	if (x->type) {
  		x->type->destructor(x);
  		xfrm_put_type(x->type);
  	}
  	if (x->xfrag.page)
  		put_page(x->xfrag.page);
  	xfrm_dev_state_free(x);
  	security_xfrm_state_free(x);
  	xfrm_state_free(x);
  }
  
  static void xfrm_state_gc_task(struct work_struct *work)
  {
  	struct xfrm_state *x;
  	struct hlist_node *tmp;
  	struct hlist_head gc_list;
  
  	spin_lock_bh(&xfrm_state_gc_lock);
  	hlist_move_list(&xfrm_state_gc_list, &gc_list);
  	spin_unlock_bh(&xfrm_state_gc_lock);
  
  	synchronize_rcu();
  
  	hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
  		___xfrm_state_destroy(x);
  }
  
  static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
  {
  	struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
  	enum hrtimer_restart ret = HRTIMER_NORESTART;
  	time64_t now = ktime_get_real_seconds();
  	time64_t next = TIME64_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.
  				 * workaround: 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 != TIME64_MAX) {
  		hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
  		ret = HRTIMER_RESTART;
  	}
  
  	goto out;
  
  expired:
  	if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
  		x->km.state = XFRM_STATE_EXPIRED;
  
  	err = __xfrm_state_delete(x);
  	if (!err)
  		km_state_expired(x, 1, 0);
  
  	xfrm_audit_state_delete(x, err ? 0 : 1, true);
  
  out:
  	spin_unlock(&x->lock);
  	return ret;
  }
  
  static void xfrm_replay_timer_handler(struct timer_list *t);
  
  struct xfrm_state *xfrm_state_alloc(struct net *net)
  {
  	struct xfrm_state *x;
  
  	x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
  
  	if (x) {
  		write_pnet(&x->xs_net, net);
  		refcount_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);
  		hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
  		x->mtimer.function = xfrm_timer_handler;
  		timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
  		x->curlft.add_time = ktime_get_real_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;
  		spin_lock_init(&x->lock);
  	}
  	return x;
  }
  EXPORT_SYMBOL(xfrm_state_alloc);
  
  void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
  {
  	WARN_ON(x->km.state != XFRM_STATE_DEAD);
  
  	if (sync) {
  		synchronize_rcu();
  		___xfrm_state_destroy(x);
  	} else {
  		spin_lock_bh(&xfrm_state_gc_lock);
  		hlist_add_head(&x->gclist, &xfrm_state_gc_list);
  		spin_unlock_bh(&xfrm_state_gc_lock);
  		schedule_work(&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(&net->xfrm.xfrm_state_lock);
  		list_del(&x->km.all);
  		hlist_del_rcu(&x->bydst);
  		hlist_del_rcu(&x->bysrc);
  		if (x->id.spi)
  			hlist_del_rcu(&x->byspi);
  		net->xfrm.state_num--;
  		spin_unlock(&net->xfrm.xfrm_state_lock);
  
  		if (x->encap_sk)
  			sock_put(rcu_dereference_raw(x->encap_sk));
  
  		xfrm_dev_state_delete(x);
  
  		/* 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, bool task_valid)
  {
  	int i, err = 0;
  
  	for (i = 0; i <= net->xfrm.state_hmask; i++) {
  		struct xfrm_state *x;
  
  		hlist_for_each_entry(x, 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, task_valid);
  				return err;
  			}
  		}
  	}
  
  	return err;
  }
  
  static inline int
  xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
  {
  	int i, err = 0;
  
  	for (i = 0; i <= net->xfrm.state_hmask; i++) {
  		struct xfrm_state *x;
  		struct xfrm_state_offload *xso;
  
  		hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
  			xso = &x->xso;
  
  			if (xso->dev == dev &&
  			   (err = security_xfrm_state_delete(x)) != 0) {
  				xfrm_audit_state_delete(x, 0, task_valid);
  				return err;
  			}
  		}
  	}
  
  	return err;
  }
  #else
  static inline int
  xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
  {
  	return 0;
  }
  
  static inline int
  xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
  {
  	return 0;
  }
  #endif
  
  int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
  {
  	int i, err = 0, cnt = 0;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	err = xfrm_state_flush_secctx_check(net, proto, task_valid);
  	if (err)
  		goto out;
  
  	err = -ESRCH;
  	for (i = 0; i <= net->xfrm.state_hmask; i++) {
  		struct xfrm_state *x;
  restart:
  		hlist_for_each_entry(x, 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(&net->xfrm.xfrm_state_lock);
  
  				err = xfrm_state_delete(x);
  				xfrm_audit_state_delete(x, err ? 0 : 1,
  							task_valid);
  				if (sync)
  					xfrm_state_put_sync(x);
  				else
  					xfrm_state_put(x);
  				if (!err)
  					cnt++;
  
  				spin_lock_bh(&net->xfrm.xfrm_state_lock);
  				goto restart;
  			}
  		}
  	}
  out:
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  	if (cnt)
  		err = 0;
  
  	return err;
  }
  EXPORT_SYMBOL(xfrm_state_flush);
  
  int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
  {
  	int i, err = 0, cnt = 0;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
  	if (err)
  		goto out;
  
  	err = -ESRCH;
  	for (i = 0; i <= net->xfrm.state_hmask; i++) {
  		struct xfrm_state *x;
  		struct xfrm_state_offload *xso;
  restart:
  		hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
  			xso = &x->xso;
  
  			if (!xfrm_state_kern(x) && xso->dev == dev) {
  				xfrm_state_hold(x);
  				spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  
  				err = xfrm_state_delete(x);
  				xfrm_audit_state_delete(x, err ? 0 : 1,
  							task_valid);
  				xfrm_state_put(x);
  				if (!err)
  					cnt++;
  
  				spin_lock_bh(&net->xfrm.xfrm_state_lock);
  				goto restart;
  			}
  		}
  	}
  	if (cnt)
  		err = 0;
  
  out:
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  	return err;
  }
  EXPORT_SYMBOL(xfrm_dev_state_flush);
  
  void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
  {
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	si->sadcnt = net->xfrm.state_num;
  	si->sadhcnt = net->xfrm.state_hmask + 1;
  	si->sadhmcnt = xfrm_state_hashmax;
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  }
  EXPORT_SYMBOL(xfrm_sad_getinfo);
  
  static void
  __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
  {
  	const struct flowi4 *fl4 = &fl->u.ip4;
  
  	sel->daddr.a4 = fl4->daddr;
  	sel->saddr.a4 = fl4->saddr;
  	sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
  	sel->dport_mask = htons(0xffff);
  	sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
  	sel->sport_mask = htons(0xffff);
  	sel->family = AF_INET;
  	sel->prefixlen_d = 32;
  	sel->prefixlen_s = 32;
  	sel->proto = fl4->flowi4_proto;
  	sel->ifindex = fl4->flowi4_oif;
  }
  
  static void
  __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
  {
  	const struct flowi6 *fl6 = &fl->u.ip6;
  
  	/* Initialize temporary selector matching only to current session. */
  	*(struct in6_addr *)&sel->daddr = fl6->daddr;
  	*(struct in6_addr *)&sel->saddr = fl6->saddr;
  	sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
  	sel->dport_mask = htons(0xffff);
  	sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
  	sel->sport_mask = htons(0xffff);
  	sel->family = AF_INET6;
  	sel->prefixlen_d = 128;
  	sel->prefixlen_s = 128;
  	sel->proto = fl6->flowi6_proto;
  	sel->ifindex = fl6->flowi6_oif;
  }
  
  static void
  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)
  {
  	switch (family) {
  	case AF_INET:
  		__xfrm4_init_tempsel(&x->sel, fl);
  		break;
  	case AF_INET6:
  		__xfrm6_init_tempsel(&x->sel, fl);
  		break;
  	}
  
  	x->id = tmpl->id;
  
  	switch (tmpl->encap_family) {
  	case AF_INET:
  		if (x->id.daddr.a4 == 0)
  			x->id.daddr.a4 = daddr->a4;
  		x->props.saddr = tmpl->saddr;
  		if (x->props.saddr.a4 == 0)
  			x->props.saddr.a4 = saddr->a4;
  		break;
  	case AF_INET6:
  		if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
  			memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
  		memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
  		if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
  			memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
  		break;
  	}
  
  	x->props.mode = tmpl->mode;
  	x->props.reqid = tmpl->reqid;
  	x->props.family = tmpl->encap_family;
  }
  
  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;
  
  	hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
  		if (x->props.family != family ||
  		    x->id.spi       != spi ||
  		    x->id.proto     != proto ||
  		    !xfrm_addr_equal(&x->id.daddr, daddr, family))
  			continue;
  
  		if ((mark & x->mark.m) != x->mark.v)
  			continue;
  		if (!xfrm_state_hold_rcu(x))
  			continue;
  		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;
  
  	hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
  		if (x->props.family != family ||
  		    x->id.proto     != proto ||
  		    !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
  		    !xfrm_addr_equal(&x->props.saddr, saddr, family))
  			continue;
  
  		if ((mark & x->mark.m) != x->mark.v)
  			continue;
  		if (!xfrm_state_hold_rcu(x))
  			continue;
  		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 &&
  		     (x->sel.family != family ||
  		      !xfrm_selector_match(&x->sel, fl, family))) ||
  		    !security_xfrm_state_pol_flow_match(x, pol,
  							&fl->u.__fl_common))
  			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 ((!x->sel.family ||
  		     (x->sel.family == family &&
  		      xfrm_selector_match(&x->sel, fl, family))) &&
  		    security_xfrm_state_pol_flow_match(x, pol,
  						       &fl->u.__fl_common))
  			*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, u32 if_id)
  {
  	static xfrm_address_t saddr_wildcard = { };
  	struct net *net = xp_net(pol);
  	unsigned int h, h_wildcard;
  	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;
  	unsigned int sequence;
  	struct km_event c;
  
  	to_put = NULL;
  
  	sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
  
  	rcu_read_lock();
  	h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
  	hlist_for_each_entry_rcu(x, 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->if_id == if_id &&
  		    !(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, family,
  					   &best, &acquire_in_progress, &error);
  	}
  	if (best || acquire_in_progress)
  		goto found;
  
  	h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
  	hlist_for_each_entry_rcu(x, 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->if_id == if_id &&
  		    !(x->props.flags & XFRM_STATE_WILDRECV) &&
  		    xfrm_addr_equal(&x->id.daddr, daddr, 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, 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;
  		}
  
  		c.net = net;
  		/* If the KMs have no listeners (yet...), avoid allocating an SA
  		 * for each and every packet - garbage collection might not
  		 * handle the flood.
  		 */
  		if (!km_is_alive(&c)) {
  			error = -ESRCH;
  			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));
  		x->if_id = if_id;
  
  		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) {
  			spin_lock_bh(&net->xfrm.xfrm_state_lock);
  			x->km.state = XFRM_STATE_ACQ;
  			list_add(&x->km.all, &net->xfrm.state_all);
  			hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
  			h = xfrm_src_hash(net, daddr, saddr, encap_family);
  			hlist_add_head_rcu(&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_rcu(&x->byspi, net->xfrm.state_byspi + h);
  			}
  			x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
  			hrtimer_start(&x->mtimer,
  				      ktime_set(net->xfrm.sysctl_acq_expires, 0),
  				      HRTIMER_MODE_REL_SOFT);
  			net->xfrm.state_num++;
  			xfrm_hash_grow_check(net, x->bydst.next != NULL);
  			spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  		} else {
  			x->km.state = XFRM_STATE_DEAD;
  			to_put = x;
  			x = NULL;
  			error = -ESRCH;
  		}
  	}
  out:
  	if (x) {
  		if (!xfrm_state_hold_rcu(x)) {
  			*err = -EAGAIN;
  			x = NULL;
  		}
  	} else {
  		*err = acquire_in_progress ? -EAGAIN : error;
  	}
  	rcu_read_unlock();
  	if (to_put)
  		xfrm_state_put(to_put);
  
  	if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
  		*err = -EAGAIN;
  		if (x) {
  			xfrm_state_put(x);
  			x = NULL;
  		}
  	}
  
  	return x;
  }
  
  struct xfrm_state *
  xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
  		    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;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
  	hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
  		if (x->props.family == family &&
  		    x->props.reqid == reqid &&
  		    (mark & x->mark.m) == x->mark.v &&
  		    x->if_id == if_id &&
  		    !(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_bh(&net->xfrm.xfrm_state_lock);
  
  
  	return rx;
  }
  EXPORT_SYMBOL(xfrm_stateonly_find);
  
  struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
  					      unsigned short family)
  {
  	struct xfrm_state *x;
  	struct xfrm_state_walk *w;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	list_for_each_entry(w, &net->xfrm.state_all, all) {
  		x = container_of(w, struct xfrm_state, km);
  		if (x->props.family != family ||
  			x->id.spi != spi)
  			continue;
  
  		xfrm_state_hold(x);
  		spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  		return x;
  	}
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  	return NULL;
  }
  EXPORT_SYMBOL(xfrm_state_lookup_byspi);
  
  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_rcu(&x->bydst, net->xfrm.state_bydst + h);
  
  	h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
  	hlist_add_head_rcu(&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_rcu(&x->byspi, net->xfrm.state_byspi + h);
  	}
  
  	hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
  	if (x->replay_maxage)
  		mod_timer(&x->rtimer, jiffies + x->replay_maxage);
  
  	net->xfrm.state_num++;
  
  	xfrm_hash_grow_check(net, x->bydst.next != NULL);
  }
  
  /* net->xfrm.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;
  	unsigned int h;
  	u32 mark = xnew->mark.v & xnew->mark.m;
  	u32 if_id = xnew->if_id;
  
  	h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
  	hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
  		if (x->props.family	== family &&
  		    x->props.reqid	== reqid &&
  		    x->if_id		== if_id &&
  		    (mark & x->mark.m) == x->mark.v &&
  		    xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
  		    xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
  			x->genid++;
  	}
  }
  
  void xfrm_state_insert(struct xfrm_state *x)
  {
  	struct net *net = xs_net(x);
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	__xfrm_state_bump_genids(x);
  	__xfrm_state_insert(x);
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  }
  EXPORT_SYMBOL(xfrm_state_insert);
  
  /* net->xfrm.xfrm_state_lock is held */
  static struct xfrm_state *__find_acq_core(struct net *net,
  					  const struct xfrm_mark *m,
  					  unsigned short family, u8 mode,
  					  u32 reqid, u32 if_id, 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 xfrm_state *x;
  	u32 mark = m->v & m->m;
  
  	hlist_for_each_entry(x, 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_equal(&x->id.daddr, daddr, family) ||
  		    !xfrm_addr_equal(&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:
  			x->sel.daddr.in6 = daddr->in6;
  			x->sel.saddr.in6 = saddr->in6;
  			x->sel.prefixlen_d = 128;
  			x->sel.prefixlen_s = 128;
  			x->props.saddr.in6 = saddr->in6;
  			x->id.daddr.in6 = daddr->in6;
  			break;
  		}
  
  		x->km.state = XFRM_STATE_ACQ;
  		x->id.proto = proto;
  		x->props.family = family;
  		x->props.mode = mode;
  		x->props.reqid = reqid;
  		x->if_id = if_id;
  		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);
  		hrtimer_start(&x->mtimer,
  			      ktime_set(net->xfrm.sysctl_acq_expires, 0),
  			      HRTIMER_MODE_REL_SOFT);
  		list_add(&x->km.all, &net->xfrm.state_all);
  		hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
  		h = xfrm_src_hash(net, daddr, saddr, family);
  		hlist_add_head_rcu(&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(&net->xfrm.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_equal(&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->if_id, 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(&net->xfrm.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 inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
  {
  	struct xfrm_user_sec_ctx *uctx;
  	int size = sizeof(*uctx) + security->ctx_len;
  	int err;
  
  	uctx = kmalloc(size, GFP_KERNEL);
  	if (!uctx)
  		return -ENOMEM;
  
  	uctx->exttype = XFRMA_SEC_CTX;
  	uctx->len = size;
  	uctx->ctx_doi = security->ctx_doi;
  	uctx->ctx_alg = security->ctx_alg;
  	uctx->ctx_len = security->ctx_len;
  	memcpy(uctx + 1, security->ctx_str, security->ctx_len);
  	err = security_xfrm_state_alloc(x, uctx);
  	kfree(uctx);
  	if (err)
  		return err;
  
  	return 0;
  }
  
  static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
  					   struct xfrm_encap_tmpl *encap)
  {
  	struct net *net = xs_net(orig);
  	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->aead) {
  		x->aead = xfrm_algo_aead_clone(orig->aead);
  		x->geniv = orig->geniv;
  		if (!x->aead)
  			goto error;
  	}
  	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 (encap || orig->encap) {
  		if (encap)
  			x->encap = kmemdup(encap, sizeof(*x->encap),
  					GFP_KERNEL);
  		else
  			x->encap = kmemdup(orig->encap, sizeof(*x->encap),
  					GFP_KERNEL);
  
  		if (!x->encap)
  			goto error;
  	}
  
  	if (orig->security)
  		if (clone_security(x, orig->security))
  			goto error;
  
  	if (orig->coaddr) {
  		x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
  				    GFP_KERNEL);
  		if (!x->coaddr)
  			goto error;
  	}
  
  	if (orig->replay_esn) {
  		if (xfrm_replay_clone(x, orig))
  			goto error;
  	}
  
  	memcpy(&x->mark, &orig->mark, sizeof(x->mark));
  	memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
  
  	if (xfrm_init_state(x) < 0)
  		goto error;
  
  	x->props.flags = orig->props.flags;
  	x->props.extra_flags = orig->props.extra_flags;
  
  	x->if_id = orig->if_id;
  	x->tfcpad = orig->tfcpad;
  	x->replay_maxdiff = orig->replay_maxdiff;
  	x->replay_maxage = orig->replay_maxage;
  	memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
  	x->km.state = orig->km.state;
  	x->km.seq = orig->km.seq;
  	x->replay = orig->replay;
  	x->preplay = orig->preplay;
  
  	return x;
  
   error:
  	xfrm_state_put(x);
  out:
  	return NULL;
  }
  
  struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
  {
  	unsigned int h;
  	struct xfrm_state *x = NULL;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  
  	if (m->reqid) {
  		h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
  				  m->reqid, m->old_family);
  		hlist_for_each_entry(x, 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_equal(&x->id.daddr, &m->old_daddr,
  					     m->old_family) ||
  			    !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
  					     m->old_family))
  				continue;
  			xfrm_state_hold(x);
  			break;
  		}
  	} else {
  		h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
  				  m->old_family);
  		hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
  			if (x->props.mode != m->mode ||
  			    x->id.proto != m->proto)
  				continue;
  			if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
  					     m->old_family) ||
  			    !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
  					     m->old_family))
  				continue;
  			xfrm_state_hold(x);
  			break;
  		}
  	}
  
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  
  	return x;
  }
  EXPORT_SYMBOL(xfrm_migrate_state_find);
  
  struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
  				      struct xfrm_migrate *m,
  				      struct xfrm_encap_tmpl *encap)
  {
  	struct xfrm_state *xc;
  
  	xc = xfrm_state_clone(x, encap);
  	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_equal(&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 (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);
  	struct net *net = xs_net(x);
  
  	to_put = NULL;
  
  	spin_lock_bh(&net->xfrm.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(&net->xfrm.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 &&
  		    x->encap->encap_type == x1->encap->encap_type)
  			memcpy(x1->encap, x->encap, sizeof(*x1->encap));
  		else if (x->encap || x1->encap)
  			goto fail;
  
  		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;
  
  		hrtimer_start(&x1->mtimer, ktime_set(1, 0),
  			      HRTIMER_MODE_REL_SOFT);
  		if (x1->curlft.use_time)
  			xfrm_state_check_expire(x1);
  
  		if (x->props.smark.m || x->props.smark.v || x->if_id) {
  			spin_lock_bh(&net->xfrm.xfrm_state_lock);
  
  			if (x->props.smark.m || x->props.smark.v)
  				x1->props.smark = x->props.smark;
  
  			if (x->if_id)
  				x1->if_id = x->if_id;
  
  			__xfrm_state_bump_genids(x1);
  			spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  		}
  
  		err = 0;
  		x->km.state = XFRM_STATE_DEAD;
  		__xfrm_state_put(x);
  	}
  
  fail:
  	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 = ktime_get_real_seconds();
  
  	if (x->curlft.bytes >= x->lft.hard_byte_limit ||
  	    x->curlft.packets >= x->lft.hard_packet_limit) {
  		x->km.state = XFRM_STATE_EXPIRED;
  		hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
  		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;
  
  	rcu_read_lock();
  	x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
  	rcu_read_unlock();
  	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(&net->xfrm.xfrm_state_lock);
  	x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  	return x;
  }
  EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
  
  struct xfrm_state *
  xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
  	      u32 if_id, u8 proto, const xfrm_address_t *daddr,
  	      const xfrm_address_t *saddr, int create, unsigned short family)
  {
  	struct xfrm_state *x;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  
  	return x;
  }
  EXPORT_SYMBOL(xfrm_find_acq);
  
  #ifdef CONFIG_XFRM_SUB_POLICY
  #if IS_ENABLED(CONFIG_IPV6)
  /* distribution counting sort function for xfrm_state and xfrm_tmpl */
  static void
  __xfrm6_sort(void **dst, void **src, int n,
  	     int (*cmp)(const void *p), int maxclass)
  {
  	int count[XFRM_MAX_DEPTH] = { };
  	int class[XFRM_MAX_DEPTH];
  	int i;
  
  	for (i = 0; i < n; i++) {
  		int c = cmp(src[i]);
  
  		class[i] = c;
  		count[c]++;
  	}
  
  	for (i = 2; i < maxclass; i++)
  		count[i] += count[i - 1];
  
  	for (i = 0; i < n; i++) {
  		dst[count[class[i] - 1]++] = src[i];
  		src[i] = NULL;
  	}
  }
  
  /* Rule for xfrm_state:
   *
   * rule 1: select IPsec transport except AH
   * rule 2: select MIPv6 RO or inbound trigger
   * rule 3: select IPsec transport AH
   * rule 4: select IPsec tunnel
   * rule 5: others
   */
  static int __xfrm6_state_sort_cmp(const void *p)
  {
  	const struct xfrm_state *v = p;
  
  	switch (v->props.mode) {
  	case XFRM_MODE_TRANSPORT:
  		if (v->id.proto != IPPROTO_AH)
  			return 1;
  		else
  			return 3;
  #if IS_ENABLED(CONFIG_IPV6_MIP6)
  	case XFRM_MODE_ROUTEOPTIMIZATION:
  	case XFRM_MODE_IN_TRIGGER:
  		return 2;
  #endif
  	case XFRM_MODE_TUNNEL:
  	case XFRM_MODE_BEET:
  		return 4;
  	}
  	return 5;
  }
  
  /* Rule for xfrm_tmpl:
   *
   * rule 1: select IPsec transport
   * rule 2: select MIPv6 RO or inbound trigger
   * rule 3: select IPsec tunnel
   * rule 4: others
   */
  static int __xfrm6_tmpl_sort_cmp(const void *p)
  {
  	const struct xfrm_tmpl *v = p;
  
  	switch (v->mode) {
  	case XFRM_MODE_TRANSPORT:
  		return 1;
  #if IS_ENABLED(CONFIG_IPV6_MIP6)
  	case XFRM_MODE_ROUTEOPTIMIZATION:
  	case XFRM_MODE_IN_TRIGGER:
  		return 2;
  #endif
  	case XFRM_MODE_TUNNEL:
  	case XFRM_MODE_BEET:
  		return 3;
  	}
  	return 4;
  }
  #else
  static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
  static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
  
  static inline void
  __xfrm6_sort(void **dst, void **src, int n,
  	     int (*cmp)(const void *p), int maxclass)
  {
  	int i;
  
  	for (i = 0; i < n; i++)
  		dst[i] = src[i];
  }
  #endif /* CONFIG_IPV6 */
  
  void
  xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
  	       unsigned short family)
  {
  	int i;
  
  	if (family == AF_INET6)
  		__xfrm6_sort((void **)dst, (void **)src, n,
  			     __xfrm6_tmpl_sort_cmp, 5);
  	else
  		for (i = 0; i < n; i++)
  			dst[i] = src[i];
  }
  
  void
  xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
  		unsigned short family)
  {
  	int i;
  
  	if (family == AF_INET6)
  		__xfrm6_sort((void **)dst, (void **)src, n,
  			     __xfrm6_state_sort_cmp, 6);
  	else
  		for (i = 0; i < n; i++)
  			dst[i] = src[i];
  }
  #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 xfrm_state *x;
  
  		hlist_for_each_entry(x, 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(&net->xfrm.xfrm_state_lock);
  	x = __xfrm_find_acq_byseq(net, mark, seq);
  	spin_unlock_bh(&net->xfrm.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 verify_spi_info(u8 proto, u32 min, u32 max)
  {
  	switch (proto) {
  	case IPPROTO_AH:
  	case IPPROTO_ESP:
  		break;
  
  	case IPPROTO_COMP:
  		/* IPCOMP spi is 16-bits. */
  		if (max >= 0x10000)
  			return -EINVAL;
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	if (min > max)
  		return -EINVAL;
  
  	return 0;
  }
  EXPORT_SYMBOL(verify_spi_info);
  
  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);
  	__be32 newspi = 0;
  	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;
  		}
  		newspi = minspi;
  	} else {
  		u32 spi = 0;
  		for (h = 0; h < high-low+1; h++) {
  			spi = low + prandom_u32()%(high-low+1);
  			x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
  			if (x0 == NULL) {
  				newspi = htonl(spi);
  				break;
  			}
  			xfrm_state_put(x0);
  		}
  	}
  	if (newspi) {
  		spin_lock_bh(&net->xfrm.xfrm_state_lock);
  		x->id.spi = newspi;
  		h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
  		hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
  		spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  
  		err = 0;
  	}
  
  unlock:
  	spin_unlock_bh(&x->lock);
  
  	return err;
  }
  EXPORT_SYMBOL(xfrm_alloc_spi);
  
  static bool __xfrm_state_filter_match(struct xfrm_state *x,
  				      struct xfrm_address_filter *filter)
  {
  	if (filter) {
  		if ((filter->family == AF_INET ||
  		     filter->family == AF_INET6) &&
  		    x->props.family != filter->family)
  			return false;
  
  		return addr_match(&x->props.saddr, &filter->saddr,
  				  filter->splen) &&
  		       addr_match(&x->id.daddr, &filter->daddr,
  				  filter->dplen);
  	}
  	return true;
  }
  
  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(&net->xfrm.xfrm_state_lock);
  	if (list_empty(&walk->all))
  		x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
  	else
  		x = list_first_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;
  		if (!__xfrm_state_filter_match(state, walk->filter))
  			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(&net->xfrm.xfrm_state_lock);
  	return err;
  }
  EXPORT_SYMBOL(xfrm_state_walk);
  
  void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
  			  struct xfrm_address_filter *filter)
  {
  	INIT_LIST_HEAD(&walk->all);
  	walk->proto = proto;
  	walk->state = XFRM_STATE_DEAD;
  	walk->seq = 0;
  	walk->filter = filter;
  }
  EXPORT_SYMBOL(xfrm_state_walk_init);
  
  void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
  {
  	kfree(walk->filter);
  
  	if (list_empty(&walk->all))
  		return;
  
  	spin_lock_bh(&net->xfrm.xfrm_state_lock);
  	list_del(&walk->all);
  	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
  }
  EXPORT_SYMBOL(xfrm_state_walk_done);
  
  static void xfrm_replay_timer_handler(struct timer_list *t)
  {
  	struct xfrm_state *x = from_timer(x, t, rtimer);
  
  	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);
  
  void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
  {
  	struct xfrm_mgr *km;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list)
  		if (km->notify_policy)
  			km->notify_policy(xp, dir, c);
  	rcu_read_unlock();
  }
  
  void km_state_notify(struct xfrm_state *x, const struct km_event *c)
  {
  	struct xfrm_mgr *km;
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list)
  		if (km->notify)
  			km->notify(x, c);
  	rcu_read_unlock();
  }
  
  EXPORT_SYMBOL(km_policy_notify);
  EXPORT_SYMBOL(km_state_notify);
  
  void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
  {
  	struct km_event c;
  
  	c.data.hard = hard;
  	c.portid = portid;
  	c.event = XFRM_MSG_EXPIRE;
  	km_state_notify(x, &c);
  }
  
  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;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		acqret = km->acquire(x, t, pol);
  		if (!acqret)
  			err = acqret;
  	}
  	rcu_read_unlock();
  	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;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		if (km->new_mapping)
  			err = km->new_mapping(x, ipaddr, sport);
  		if (!err)
  			break;
  	}
  	rcu_read_unlock();
  	return err;
  }
  EXPORT_SYMBOL(km_new_mapping);
  
  void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
  {
  	struct km_event c;
  
  	c.data.hard = hard;
  	c.portid = portid;
  	c.event = XFRM_MSG_POLEXPIRE;
  	km_policy_notify(pol, dir, &c);
  }
  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,
  	       const struct xfrm_encap_tmpl *encap)
  {
  	int err = -EINVAL;
  	int ret;
  	struct xfrm_mgr *km;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		if (km->migrate) {
  			ret = km->migrate(sel, dir, type, m, num_migrate, k,
  					  encap);
  			if (!ret)
  				err = ret;
  		}
  	}
  	rcu_read_unlock();
  	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;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		if (km->report) {
  			ret = km->report(net, proto, sel, addr);
  			if (!ret)
  				err = ret;
  		}
  	}
  	rcu_read_unlock();
  	return err;
  }
  EXPORT_SYMBOL(km_report);
  
  static bool km_is_alive(const struct km_event *c)
  {
  	struct xfrm_mgr *km;
  	bool is_alive = false;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		if (km->is_alive && km->is_alive(c)) {
  			is_alive = true;
  			break;
  		}
  	}
  	rcu_read_unlock();
  
  	return is_alive;
  }
  
  #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
  static DEFINE_SPINLOCK(xfrm_translator_lock);
  static struct xfrm_translator __rcu *xfrm_translator;
  
  struct xfrm_translator *xfrm_get_translator(void)
  {
  	struct xfrm_translator *xtr;
  
  	rcu_read_lock();
  	xtr = rcu_dereference(xfrm_translator);
  	if (unlikely(!xtr))
  		goto out;
  	if (!try_module_get(xtr->owner))
  		xtr = NULL;
  out:
  	rcu_read_unlock();
  	return xtr;
  }
  EXPORT_SYMBOL_GPL(xfrm_get_translator);
  
  void xfrm_put_translator(struct xfrm_translator *xtr)
  {
  	module_put(xtr->owner);
  }
  EXPORT_SYMBOL_GPL(xfrm_put_translator);
  
  int xfrm_register_translator(struct xfrm_translator *xtr)
  {
  	int err = 0;
  
  	spin_lock_bh(&xfrm_translator_lock);
  	if (unlikely(xfrm_translator != NULL))
  		err = -EEXIST;
  	else
  		rcu_assign_pointer(xfrm_translator, xtr);
  	spin_unlock_bh(&xfrm_translator_lock);
  
  	return err;
  }
  EXPORT_SYMBOL_GPL(xfrm_register_translator);
  
  int xfrm_unregister_translator(struct xfrm_translator *xtr)
  {
  	int err = 0;
  
  	spin_lock_bh(&xfrm_translator_lock);
  	if (likely(xfrm_translator != NULL)) {
  		if (rcu_access_pointer(xfrm_translator) != xtr)
  			err = -EINVAL;
  		else
  			RCU_INIT_POINTER(xfrm_translator, NULL);
  	}
  	spin_unlock_bh(&xfrm_translator_lock);
  	synchronize_rcu();
  
  	return err;
  }
  EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
  #endif
  
  int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
  {
  	int err;
  	u8 *data;
  	struct xfrm_mgr *km;
  	struct xfrm_policy *pol = NULL;
  
  	if (sockptr_is_null(optval) && !optlen) {
  		xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
  		xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
  		__sk_dst_reset(sk);
  		return 0;
  	}
  
  	if (optlen <= 0 || optlen > PAGE_SIZE)
  		return -EMSGSIZE;
  
  	data = memdup_sockptr(optval, optlen);
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	if (in_compat_syscall()) {
  		struct xfrm_translator *xtr = xfrm_get_translator();
  
  		if (!xtr) {
  			kfree(data);
  			return -EOPNOTSUPP;
  		}
  
  		err = xtr->xlate_user_policy_sockptr(&data, optlen);
  		xfrm_put_translator(xtr);
  		if (err) {
  			kfree(data);
  			return err;
  		}
  	}
  
  	err = -EINVAL;
  	rcu_read_lock();
  	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
  		pol = km->compile_policy(sk, optname, data,
  					 optlen, &err);
  		if (err >= 0)
  			break;
  	}
  	rcu_read_unlock();
  
  	if (err >= 0) {
  		xfrm_sk_policy_insert(sk, err, pol);
  		xfrm_pol_put(pol);
  		__sk_dst_reset(sk);
  		err = 0;
  	}
  
  	kfree(data);
  	return err;
  }
  EXPORT_SYMBOL(xfrm_user_policy);
  
  static DEFINE_SPINLOCK(xfrm_km_lock);
  
  int xfrm_register_km(struct xfrm_mgr *km)
  {
  	spin_lock_bh(&xfrm_km_lock);
  	list_add_tail_rcu(&km->list, &xfrm_km_list);
  	spin_unlock_bh(&xfrm_km_lock);
  	return 0;
  }
  EXPORT_SYMBOL(xfrm_register_km);
  
  int xfrm_unregister_km(struct xfrm_mgr *km)
  {
  	spin_lock_bh(&xfrm_km_lock);
  	list_del_rcu(&km->list);
  	spin_unlock_bh(&xfrm_km_lock);
  	synchronize_rcu();
  	return 0;
  }
  EXPORT_SYMBOL(xfrm_unregister_km);
  
  int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
  {
  	int err = 0;
  
  	if (WARN_ON(afinfo->family >= NPROTO))
  		return -EAFNOSUPPORT;
  
  	spin_lock_bh(&xfrm_state_afinfo_lock);
  	if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
  		err = -EEXIST;
  	else
  		rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
  	spin_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, family = afinfo->family;
  
  	if (WARN_ON(family >= NPROTO))
  		return -EAFNOSUPPORT;
  
  	spin_lock_bh(&xfrm_state_afinfo_lock);
  	if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
  		if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
  			err = -EINVAL;
  		else
  			RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
  	}
  	spin_unlock_bh(&xfrm_state_afinfo_lock);
  	synchronize_rcu();
  	return err;
  }
  EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
  
  struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
  {
  	if (unlikely(family >= NPROTO))
  		return NULL;
  
  	return rcu_dereference(xfrm_state_afinfo[family]);
  }
  EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
  
  struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
  {
  	struct xfrm_state_afinfo *afinfo;
  	if (unlikely(family >= NPROTO))
  		return NULL;
  	rcu_read_lock();
  	afinfo = rcu_dereference(xfrm_state_afinfo[family]);
  	if (unlikely(!afinfo))
  		rcu_read_unlock();
  	return afinfo;
  }
  
  void xfrm_flush_gc(void)
  {
  	flush_work(&xfrm_state_gc_work);
  }
  EXPORT_SYMBOL(xfrm_flush_gc);
  
  /* 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_sync(t);
  		x->tunnel = NULL;
  	}
  }
  EXPORT_SYMBOL(xfrm_state_delete_tunnel);
  
  u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
  {
  	const struct xfrm_type *type = READ_ONCE(x->type);
  	struct crypto_aead *aead;
  	u32 blksize, net_adj = 0;
  
  	if (x->km.state != XFRM_STATE_VALID ||
  	    !type || type->proto != IPPROTO_ESP)
  		return mtu - x->props.header_len;
  
  	aead = x->data;
  	blksize = ALIGN(crypto_aead_blocksize(aead), 4);
  
  	switch (x->props.mode) {
  	case XFRM_MODE_TRANSPORT:
  	case XFRM_MODE_BEET:
  		if (x->props.family == AF_INET)
  			net_adj = sizeof(struct iphdr);
  		else if (x->props.family == AF_INET6)
  			net_adj = sizeof(struct ipv6hdr);
  		break;
  	case XFRM_MODE_TUNNEL:
  		break;
  	default:
  		WARN_ON_ONCE(1);
  		break;
  	}
  
  	return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
  		 net_adj) & ~(blksize - 1)) + net_adj - 2;
  }
  EXPORT_SYMBOL_GPL(xfrm_state_mtu);
  
  int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
  {
  	const struct xfrm_mode *inner_mode;
  	const struct xfrm_mode *outer_mode;
  	int family = x->props.family;
  	int err;
  
  	if (family == AF_INET &&
  	    xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
  		x->props.flags |= XFRM_STATE_NOPMTUDISC;
  
  	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)
  			goto error;
  
  		x->inner_mode = *inner_mode;
  	} else {
  		const 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))
  			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;
  		}
  	}
  
  	x->type = xfrm_get_type(x->id.proto, family);
  	if (x->type == NULL)
  		goto error;
  
  	x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
  
  	err = x->type->init_state(x);
  	if (err)
  		goto error;
  
  	outer_mode = xfrm_get_mode(x->props.mode, family);
  	if (!outer_mode) {
  		err = -EPROTONOSUPPORT;
  		goto error;
  	}
  
  	x->outer_mode = *outer_mode;
  	if (init_replay) {
  		err = xfrm_init_replay(x);
  		if (err)
  			goto error;
  	}
  
  error:
  	return err;
  }
  
  EXPORT_SYMBOL(__xfrm_init_state);
  
  int xfrm_init_state(struct xfrm_state *x)
  {
  	int err;
  
  	err = __xfrm_init_state(x, true, false);
  	if (!err)
  		x->km.state = XFRM_STATE_VALID;
  
  	return err;
  }
  
  EXPORT_SYMBOL(xfrm_init_state);
  
  int __net_init xfrm_state_init(struct net *net)
  {
  	unsigned int sz;
  
  	if (net_eq(net, &init_net))
  		xfrm_state_cache = KMEM_CACHE(xfrm_state,
  					      SLAB_HWCACHE_ALIGN | SLAB_PANIC);
  
  	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);
  	spin_lock_init(&net->xfrm.xfrm_state_lock);
  	seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
  			       &net->xfrm.xfrm_state_lock);
  	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)
  {
  	unsigned int sz;
  
  	flush_work(&net->xfrm.state_hash_work);
  	flush_work(&xfrm_state_gc_work);
  	xfrm_state_flush(net, 0, false, true);
  
  	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, bool task_valid)
  {
  	struct audit_buffer *audit_buf;
  
  	audit_buf = xfrm_audit_start("SAD-add");
  	if (audit_buf == NULL)
  		return;
  	xfrm_audit_helper_usrinfo(task_valid, 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, bool task_valid)
  {
  	struct audit_buffer *audit_buf;
  
  	audit_buf = xfrm_audit_start("SAD-delete");
  	if (audit_buf == NULL)
  		return;
  	xfrm_audit_helper_usrinfo(task_valid, 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 */
  