/* xfrm_user.c: User interface to configure xfrm engine.
   *
   * Copyright (C) 2002 David S. Miller (davem@redhat.com)
   *
   * Changes:
   *	Mitsuru KANDA @USAGI
   * 	Kazunori MIYAZAWA @USAGI
   * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   * 		IPv6 support

   *

   */

  #include <linux/crypto.h>

  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <linux/socket.h>
  #include <linux/string.h>
  #include <linux/net.h>
  #include <linux/skbuff.h>

  #include <linux/pfkeyv2.h>
  #include <linux/ipsec.h>
  #include <linux/init.h>
  #include <linux/security.h>
  #include <net/sock.h>
  #include <net/xfrm.h>

  #include <net/netlink.h>

  #include <net/ah.h>

  #include <asm/uaccess.h>

  #if IS_ENABLED(CONFIG_IPV6)

  #include <linux/in6.h>
  #endif

  static inline int aead_len(struct xfrm_algo_aead *alg)
  {
  	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
  }

  static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)

  {

  	struct nlattr *rt = attrs[type];

  	struct xfrm_algo *algp;
  
  	if (!rt)
  		return 0;

  	algp = nla_data(rt);

  	if (nla_len(rt) < xfrm_alg_len(algp))

  		return -EINVAL;

  	switch (type) {
  	case XFRMA_ALG_AUTH:

  	case XFRMA_ALG_CRYPT:

  	case XFRMA_ALG_COMP:

  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  	return 0;
  }

  static int verify_auth_trunc(struct nlattr **attrs)
  {
  	struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
  	struct xfrm_algo_auth *algp;
  
  	if (!rt)
  		return 0;
  
  	algp = nla_data(rt);
  	if (nla_len(rt) < xfrm_alg_auth_len(algp))
  		return -EINVAL;
  
  	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  	return 0;
  }

  static int verify_aead(struct nlattr **attrs)
  {
  	struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
  	struct xfrm_algo_aead *algp;
  
  	if (!rt)
  		return 0;
  
  	algp = nla_data(rt);
  	if (nla_len(rt) < aead_len(algp))
  		return -EINVAL;
  
  	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
  	return 0;
  }

  static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,

  			   xfrm_address_t **addrp)
  {

  	struct nlattr *rt = attrs[type];

  	if (rt && addrp)

  		*addrp = nla_data(rt);

  }

  static inline int verify_sec_ctx_len(struct nlattr **attrs)

  {

  	struct nlattr *rt = attrs[XFRMA_SEC_CTX];

  	struct xfrm_user_sec_ctx *uctx;

  
  	if (!rt)
  		return 0;

  	uctx = nla_data(rt);

  	if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))

  		return -EINVAL;
  
  	return 0;
  }

  static inline int verify_replay(struct xfrm_usersa_info *p,
  				struct nlattr **attrs)
  {
  	struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];

  	if ((p->flags & XFRM_STATE_ESN) && !rt)
  		return -EINVAL;

  	if (!rt)
  		return 0;

  	if (p->id.proto != IPPROTO_ESP)
  		return -EINVAL;

  	if (p->replay_window != 0)
  		return -EINVAL;
  
  	return 0;
  }

  static int verify_newsa_info(struct xfrm_usersa_info *p,

  			     struct nlattr **attrs)

  {
  	int err;
  
  	err = -EINVAL;
  	switch (p->family) {
  	case AF_INET:
  		break;
  
  	case AF_INET6:

  #if IS_ENABLED(CONFIG_IPV6)

  		break;
  #else
  		err = -EAFNOSUPPORT;
  		goto out;
  #endif
  
  	default:
  		goto out;

  	}

  
  	err = -EINVAL;
  	switch (p->id.proto) {
  	case IPPROTO_AH:

  		if ((!attrs[XFRMA_ALG_AUTH]	&&
  		     !attrs[XFRMA_ALG_AUTH_TRUNC]) ||

  		    attrs[XFRMA_ALG_AEAD]	||

  		    attrs[XFRMA_ALG_CRYPT]	||

  		    attrs[XFRMA_ALG_COMP]	||
  		    attrs[XFRMA_TFCPAD])

  			goto out;
  		break;
  
  	case IPPROTO_ESP:

  		if (attrs[XFRMA_ALG_COMP])
  			goto out;
  		if (!attrs[XFRMA_ALG_AUTH] &&

  		    !attrs[XFRMA_ALG_AUTH_TRUNC] &&

  		    !attrs[XFRMA_ALG_CRYPT] &&
  		    !attrs[XFRMA_ALG_AEAD])
  			goto out;
  		if ((attrs[XFRMA_ALG_AUTH] ||

  		     attrs[XFRMA_ALG_AUTH_TRUNC] ||

  		     attrs[XFRMA_ALG_CRYPT]) &&
  		    attrs[XFRMA_ALG_AEAD])

  			goto out;

  		if (attrs[XFRMA_TFCPAD] &&
  		    p->mode != XFRM_MODE_TUNNEL)
  			goto out;

  		break;
  
  	case IPPROTO_COMP:

  		if (!attrs[XFRMA_ALG_COMP]	||

  		    attrs[XFRMA_ALG_AEAD]	||

  		    attrs[XFRMA_ALG_AUTH]	||

  		    attrs[XFRMA_ALG_AUTH_TRUNC]	||

  		    attrs[XFRMA_ALG_CRYPT]	||
  		    attrs[XFRMA_TFCPAD])

  			goto out;
  		break;

  #if IS_ENABLED(CONFIG_IPV6)

  	case IPPROTO_DSTOPTS:
  	case IPPROTO_ROUTING:

  		if (attrs[XFRMA_ALG_COMP]	||
  		    attrs[XFRMA_ALG_AUTH]	||

  		    attrs[XFRMA_ALG_AUTH_TRUNC]	||

  		    attrs[XFRMA_ALG_AEAD]	||

  		    attrs[XFRMA_ALG_CRYPT]	||
  		    attrs[XFRMA_ENCAP]		||
  		    attrs[XFRMA_SEC_CTX]	||

  		    attrs[XFRMA_TFCPAD]		||

  		    !attrs[XFRMA_COADDR])

  			goto out;
  		break;
  #endif

  	default:
  		goto out;

  	}

  	if ((err = verify_aead(attrs)))
  		goto out;

  	if ((err = verify_auth_trunc(attrs)))
  		goto out;

  	if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))

  		goto out;

  	if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))

  		goto out;

  	if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))

  		goto out;

  	if ((err = verify_sec_ctx_len(attrs)))

  		goto out;

  	if ((err = verify_replay(p, attrs)))
  		goto out;

  
  	err = -EINVAL;
  	switch (p->mode) {

  	case XFRM_MODE_TRANSPORT:
  	case XFRM_MODE_TUNNEL:

  	case XFRM_MODE_ROUTEOPTIMIZATION:

  	case XFRM_MODE_BEET:

  		break;
  
  	default:
  		goto out;

  	}

  
  	err = 0;
  
  out:
  	return err;
  }
  
  static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,

  			   struct xfrm_algo_desc *(*get_byname)(const char *, int),

  			   struct nlattr *rta)

  {

  	struct xfrm_algo *p, *ualg;
  	struct xfrm_algo_desc *algo;
  
  	if (!rta)
  		return 0;

  	ualg = nla_data(rta);

  
  	algo = get_byname(ualg->alg_name, 1);
  	if (!algo)
  		return -ENOSYS;
  	*props = algo->desc.sadb_alg_id;

  	p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);

  	if (!p)
  		return -ENOMEM;

  	strcpy(p->alg_name, algo->name);

  	*algpp = p;
  	return 0;
  }

  static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
  		       struct nlattr *rta)
  {
  	struct xfrm_algo *ualg;
  	struct xfrm_algo_auth *p;
  	struct xfrm_algo_desc *algo;
  
  	if (!rta)
  		return 0;
  
  	ualg = nla_data(rta);
  
  	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
  	if (!algo)
  		return -ENOSYS;
  	*props = algo->desc.sadb_alg_id;
  
  	p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
  	if (!p)
  		return -ENOMEM;
  
  	strcpy(p->alg_name, algo->name);
  	p->alg_key_len = ualg->alg_key_len;
  	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
  	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
  
  	*algpp = p;
  	return 0;
  }
  
  static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
  			     struct nlattr *rta)
  {
  	struct xfrm_algo_auth *p, *ualg;
  	struct xfrm_algo_desc *algo;
  
  	if (!rta)
  		return 0;
  
  	ualg = nla_data(rta);
  
  	algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
  	if (!algo)
  		return -ENOSYS;

  	if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
  	    ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)

  		return -EINVAL;
  	*props = algo->desc.sadb_alg_id;
  
  	p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
  	if (!p)
  		return -ENOMEM;
  
  	strcpy(p->alg_name, algo->name);
  	if (!p->alg_trunc_len)
  		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
  
  	*algpp = p;
  	return 0;
  }

  static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
  		       struct nlattr *rta)
  {
  	struct xfrm_algo_aead *p, *ualg;
  	struct xfrm_algo_desc *algo;
  
  	if (!rta)
  		return 0;
  
  	ualg = nla_data(rta);
  
  	algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
  	if (!algo)
  		return -ENOSYS;
  	*props = algo->desc.sadb_alg_id;
  
  	p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
  	if (!p)
  		return -ENOMEM;
  
  	strcpy(p->alg_name, algo->name);
  	*algpp = p;
  	return 0;
  }

  static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
  					 struct nlattr *rp)
  {
  	struct xfrm_replay_state_esn *up;
  
  	if (!replay_esn || !rp)
  		return 0;
  
  	up = nla_data(rp);
  
  	if (xfrm_replay_state_esn_len(replay_esn) !=
  			xfrm_replay_state_esn_len(up))
  		return -EINVAL;
  
  	return 0;
  }

  static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
  				       struct xfrm_replay_state_esn **preplay_esn,
  				       struct nlattr *rta)
  {
  	struct xfrm_replay_state_esn *p, *pp, *up;
  
  	if (!rta)
  		return 0;
  
  	up = nla_data(rta);
  
  	p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
  	if (!p)
  		return -ENOMEM;
  
  	pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
  	if (!pp) {
  		kfree(p);
  		return -ENOMEM;
  	}
  
  	*replay_esn = p;
  	*preplay_esn = pp;
  
  	return 0;
  }

  static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)

  {

  	int len = 0;
  
  	if (xfrm_ctx) {
  		len += sizeof(struct xfrm_user_sec_ctx);
  		len += xfrm_ctx->ctx_len;
  	}
  	return len;
  }

  static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
  {
  	memcpy(&x->id, &p->id, sizeof(x->id));
  	memcpy(&x->sel, &p->sel, sizeof(x->sel));
  	memcpy(&x->lft, &p->lft, sizeof(x->lft));
  	x->props.mode = p->mode;
  	x->props.replay_window = p->replay_window;
  	x->props.reqid = p->reqid;
  	x->props.family = p->family;

  	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));

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

  	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))

  		x->sel.family = p->family;

  }

  /*
   * someday when pfkey also has support, we could have the code
   * somehow made shareable and move it to xfrm_state.c - JHS
   *
  */

  static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)

  {

  	struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];

  	struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];

  	struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
  	struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
  	struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];

  	if (re) {
  		struct xfrm_replay_state_esn *replay_esn;
  		replay_esn = nla_data(re);
  		memcpy(x->replay_esn, replay_esn,
  		       xfrm_replay_state_esn_len(replay_esn));
  		memcpy(x->preplay_esn, replay_esn,
  		       xfrm_replay_state_esn_len(replay_esn));
  	}

  	if (rp) {
  		struct xfrm_replay_state *replay;

  		replay = nla_data(rp);

  		memcpy(&x->replay, replay, sizeof(*replay));
  		memcpy(&x->preplay, replay, sizeof(*replay));
  	}
  
  	if (lt) {
  		struct xfrm_lifetime_cur *ltime;

  		ltime = nla_data(lt);

  		x->curlft.bytes = ltime->bytes;
  		x->curlft.packets = ltime->packets;
  		x->curlft.add_time = ltime->add_time;
  		x->curlft.use_time = ltime->use_time;
  	}

  	if (et)

  		x->replay_maxage = nla_get_u32(et);

  	if (rt)

  		x->replay_maxdiff = nla_get_u32(rt);

  }

  static struct xfrm_state *xfrm_state_construct(struct net *net,
  					       struct xfrm_usersa_info *p,

  					       struct nlattr **attrs,

  					       int *errp)
  {

  	struct xfrm_state *x = xfrm_state_alloc(net);

  	int err = -ENOMEM;
  
  	if (!x)
  		goto error_no_put;
  
  	copy_from_user_state(x, p);

  	if ((err = attach_aead(&x->aead, &x->props.ealgo,
  			       attrs[XFRMA_ALG_AEAD])))
  		goto error;

  	if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
  				     attrs[XFRMA_ALG_AUTH_TRUNC])))

  		goto error;

  	if (!x->props.aalgo) {
  		if ((err = attach_auth(&x->aalg, &x->props.aalgo,
  				       attrs[XFRMA_ALG_AUTH])))
  			goto error;
  	}

  	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
  				   xfrm_ealg_get_byname,

  				   attrs[XFRMA_ALG_CRYPT])))

  		goto error;
  	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
  				   xfrm_calg_get_byname,

  				   attrs[XFRMA_ALG_COMP])))

  		goto error;

  
  	if (attrs[XFRMA_ENCAP]) {
  		x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
  				   sizeof(*x->encap), GFP_KERNEL);
  		if (x->encap == NULL)
  			goto error;
  	}

  	if (attrs[XFRMA_TFCPAD])
  		x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);

  	if (attrs[XFRMA_COADDR]) {
  		x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
  				    sizeof(*x->coaddr), GFP_KERNEL);
  		if (x->coaddr == NULL)
  			goto error;
  	}

  	xfrm_mark_get(attrs, &x->mark);

  	err = __xfrm_init_state(x, false);

  	if (err)
  		goto error;

  	if (attrs[XFRMA_SEC_CTX] &&
  	    security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))

  		goto error;

  	if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
  					       attrs[XFRMA_REPLAY_ESN_VAL])))
  		goto error;

  	x->km.seq = p->seq;

  	x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;

  	/* sysctl_xfrm_aevent_etime is in 100ms units */

  	x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;

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

  	/* override default values from above */

  	xfrm_update_ae_params(x, attrs);

  
  	return x;
  
  error:
  	x->km.state = XFRM_STATE_DEAD;
  	xfrm_state_put(x);
  error_no_put:
  	*errp = err;
  	return NULL;
  }

  static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_usersa_info *p = nlmsg_data(nlh);

  	struct xfrm_state *x;
  	int err;

  	struct km_event c;

  	uid_t loginuid = audit_get_loginuid(current);
  	u32 sessionid = audit_get_sessionid(current);
  	u32 sid;

  	err = verify_newsa_info(p, attrs);

  	if (err)
  		return err;

  	x = xfrm_state_construct(net, p, attrs, &err);

  	if (!x)
  		return err;

  	xfrm_state_hold(x);

  	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
  		err = xfrm_state_add(x);
  	else
  		err = xfrm_state_update(x);

  	security_task_getsecid(current, &sid);

  	xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);

  	if (err < 0) {
  		x->km.state = XFRM_STATE_DEAD;

  		__xfrm_state_put(x);

  		goto out;

  	}

  	c.seq = nlh->nlmsg_seq;
  	c.pid = nlh->nlmsg_pid;

  	c.event = nlh->nlmsg_type;

  
  	km_state_notify(x, &c);

  out:

  	xfrm_state_put(x);

  	return err;
  }

  static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
  						 struct xfrm_usersa_id *p,

  						 struct nlattr **attrs,

  						 int *errp)
  {
  	struct xfrm_state *x = NULL;

  	struct xfrm_mark m;

  	int err;

  	u32 mark = xfrm_mark_get(attrs, &m);

  
  	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
  		err = -ESRCH;

  		x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);

  	} else {
  		xfrm_address_t *saddr = NULL;

  		verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);

  		if (!saddr) {
  			err = -EINVAL;
  			goto out;
  		}

  		err = -ESRCH;

  		x = xfrm_state_lookup_byaddr(net, mark,
  					     &p->daddr, saddr,

  					     p->proto, p->family);

  	}
  
   out:
  	if (!x && errp)
  		*errp = err;
  	return x;
  }

  static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_state *x;

  	int err = -ESRCH;

  	struct km_event c;

  	struct xfrm_usersa_id *p = nlmsg_data(nlh);

  	uid_t loginuid = audit_get_loginuid(current);
  	u32 sessionid = audit_get_sessionid(current);
  	u32 sid;

  	x = xfrm_user_state_lookup(net, p, attrs, &err);

  	if (x == NULL)

  		return err;

  	if ((err = security_xfrm_state_delete(x)) != 0)

  		goto out;

  	if (xfrm_state_kern(x)) {

  		err = -EPERM;
  		goto out;

  	}

  	err = xfrm_state_delete(x);

  	if (err < 0)
  		goto out;

  
  	c.seq = nlh->nlmsg_seq;
  	c.pid = nlh->nlmsg_pid;

  	c.event = nlh->nlmsg_type;

  	km_state_notify(x, &c);

  out:

  	security_task_getsecid(current, &sid);

  	xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);

  	xfrm_state_put(x);

  	return err;

  }
  
  static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
  {
  	memcpy(&p->id, &x->id, sizeof(p->id));
  	memcpy(&p->sel, &x->sel, sizeof(p->sel));
  	memcpy(&p->lft, &x->lft, sizeof(p->lft));
  	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
  	memcpy(&p->stats, &x->stats, sizeof(p->stats));

  	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));

  	p->mode = x->props.mode;
  	p->replay_window = x->props.replay_window;
  	p->reqid = x->props.reqid;
  	p->family = x->props.family;
  	p->flags = x->props.flags;
  	p->seq = x->km.seq;
  }
  
  struct xfrm_dump_info {
  	struct sk_buff *in_skb;
  	struct sk_buff *out_skb;
  	u32 nlmsg_seq;
  	u16 nlmsg_flags;

  };

  static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
  {

  	struct xfrm_user_sec_ctx *uctx;
  	struct nlattr *attr;

  	int ctx_size = sizeof(*uctx) + s->ctx_len;

  
  	attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
  	if (attr == NULL)
  		return -EMSGSIZE;
  
  	uctx = nla_data(attr);
  	uctx->exttype = XFRMA_SEC_CTX;
  	uctx->len = ctx_size;
  	uctx->ctx_doi = s->ctx_doi;
  	uctx->ctx_alg = s->ctx_alg;
  	uctx->ctx_len = s->ctx_len;
  	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
  
  	return 0;
  }

  static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
  {
  	struct xfrm_algo *algo;
  	struct nlattr *nla;
  
  	nla = nla_reserve(skb, XFRMA_ALG_AUTH,
  			  sizeof(*algo) + (auth->alg_key_len + 7) / 8);
  	if (!nla)
  		return -EMSGSIZE;
  
  	algo = nla_data(nla);
  	strcpy(algo->alg_name, auth->alg_name);
  	memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
  	algo->alg_key_len = auth->alg_key_len;
  
  	return 0;
  }

  /* Don't change this without updating xfrm_sa_len! */
  static int copy_to_user_state_extra(struct xfrm_state *x,
  				    struct xfrm_usersa_info *p,
  				    struct sk_buff *skb)

  {

  	copy_to_user_state(x, p);

  	if (x->coaddr)
  		NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
  
  	if (x->lastused)
  		NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);

  	if (x->aead)
  		NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);

  	if (x->aalg) {
  		if (copy_to_user_auth(x->aalg, skb))
  			goto nla_put_failure;
  
  		NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
  			xfrm_alg_auth_len(x->aalg), x->aalg);
  	}

  	if (x->ealg)

  		NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);

  	if (x->calg)

  		NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

  
  	if (x->encap)

  		NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);

  	if (x->tfcpad)
  		NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);

  	if (xfrm_mark_put(skb, &x->mark))
  		goto nla_put_failure;

  	if (x->replay_esn)
  		NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
  			xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn);

  	if (x->security && copy_sec_ctx(x->security, skb) < 0)
  		goto nla_put_failure;

  	return 0;
  
  nla_put_failure:
  	return -EMSGSIZE;
  }
  
  static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
  {
  	struct xfrm_dump_info *sp = ptr;
  	struct sk_buff *in_skb = sp->in_skb;
  	struct sk_buff *skb = sp->out_skb;
  	struct xfrm_usersa_info *p;
  	struct nlmsghdr *nlh;
  	int err;

  	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
  			XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
  	if (nlh == NULL)
  		return -EMSGSIZE;
  
  	p = nlmsg_data(nlh);
  
  	err = copy_to_user_state_extra(x, p, skb);
  	if (err)
  		goto nla_put_failure;

  	nlmsg_end(skb, nlh);

  	return 0;

  nla_put_failure:

  	nlmsg_cancel(skb, nlh);

  	return err;

  }

  static int xfrm_dump_sa_done(struct netlink_callback *cb)
  {
  	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
  	xfrm_state_walk_done(walk);
  	return 0;
  }

  static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];

  	struct xfrm_dump_info info;

  	BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
  		     sizeof(cb->args) - sizeof(cb->args[0]));

  	info.in_skb = cb->skb;
  	info.out_skb = skb;
  	info.nlmsg_seq = cb->nlh->nlmsg_seq;
  	info.nlmsg_flags = NLM_F_MULTI;

  
  	if (!cb->args[0]) {
  		cb->args[0] = 1;
  		xfrm_state_walk_init(walk, 0);
  	}

  	(void) xfrm_state_walk(net, walk, dump_one_state, &info);

  
  	return skb->len;
  }
  
  static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
  					  struct xfrm_state *x, u32 seq)
  {
  	struct xfrm_dump_info info;
  	struct sk_buff *skb;

  	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);

  	if (!skb)
  		return ERR_PTR(-ENOMEM);

  	info.in_skb = in_skb;
  	info.out_skb = skb;
  	info.nlmsg_seq = seq;
  	info.nlmsg_flags = 0;

  
  	if (dump_one_state(x, 0, &info)) {
  		kfree_skb(skb);
  		return NULL;
  	}
  
  	return skb;
  }

  static inline size_t xfrm_spdinfo_msgsize(void)
  {
  	return NLMSG_ALIGN(4)
  	       + nla_total_size(sizeof(struct xfrmu_spdinfo))
  	       + nla_total_size(sizeof(struct xfrmu_spdhinfo));
  }

  static int build_spdinfo(struct sk_buff *skb, struct net *net,
  			 u32 pid, u32 seq, u32 flags)

  {

  	struct xfrmk_spdinfo si;
  	struct xfrmu_spdinfo spc;
  	struct xfrmu_spdhinfo sph;

  	struct nlmsghdr *nlh;
  	u32 *f;
  
  	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);

  	if (nlh == NULL) /* shouldn't really happen ... */

  		return -EMSGSIZE;
  
  	f = nlmsg_data(nlh);
  	*f = flags;

  	xfrm_spd_getinfo(net, &si);

  	spc.incnt = si.incnt;
  	spc.outcnt = si.outcnt;
  	spc.fwdcnt = si.fwdcnt;
  	spc.inscnt = si.inscnt;
  	spc.outscnt = si.outscnt;
  	spc.fwdscnt = si.fwdscnt;
  	sph.spdhcnt = si.spdhcnt;
  	sph.spdhmcnt = si.spdhmcnt;
  
  	NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
  	NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);

  
  	return nlmsg_end(skb, nlh);
  
  nla_put_failure:
  	nlmsg_cancel(skb, nlh);
  	return -EMSGSIZE;
  }
  
  static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct sk_buff *r_skb;

  	u32 *flags = nlmsg_data(nlh);

  	u32 spid = NETLINK_CB(skb).pid;
  	u32 seq = nlh->nlmsg_seq;

  	r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);

  	if (r_skb == NULL)
  		return -ENOMEM;

  	if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)

  		BUG();

  	return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);

  }

  static inline size_t xfrm_sadinfo_msgsize(void)
  {
  	return NLMSG_ALIGN(4)
  	       + nla_total_size(sizeof(struct xfrmu_sadhinfo))
  	       + nla_total_size(4); /* XFRMA_SAD_CNT */
  }

  static int build_sadinfo(struct sk_buff *skb, struct net *net,
  			 u32 pid, u32 seq, u32 flags)

  {

  	struct xfrmk_sadinfo si;
  	struct xfrmu_sadhinfo sh;

  	struct nlmsghdr *nlh;
  	u32 *f;
  
  	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);

  	if (nlh == NULL) /* shouldn't really happen ... */

  		return -EMSGSIZE;
  
  	f = nlmsg_data(nlh);
  	*f = flags;

  	xfrm_sad_getinfo(net, &si);

  	sh.sadhmcnt = si.sadhmcnt;
  	sh.sadhcnt = si.sadhcnt;
  
  	NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
  	NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);

  
  	return nlmsg_end(skb, nlh);
  
  nla_put_failure:
  	nlmsg_cancel(skb, nlh);
  	return -EMSGSIZE;
  }
  
  static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct sk_buff *r_skb;

  	u32 *flags = nlmsg_data(nlh);

  	u32 spid = NETLINK_CB(skb).pid;
  	u32 seq = nlh->nlmsg_seq;

  	r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);

  	if (r_skb == NULL)
  		return -ENOMEM;

  	if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)

  		BUG();

  	return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);

  }

  static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_usersa_id *p = nlmsg_data(nlh);

  	struct xfrm_state *x;
  	struct sk_buff *resp_skb;

  	int err = -ESRCH;

  	x = xfrm_user_state_lookup(net, p, attrs, &err);

  	if (x == NULL)
  		goto out_noput;
  
  	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
  	if (IS_ERR(resp_skb)) {
  		err = PTR_ERR(resp_skb);
  	} else {

  		err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);

  	}
  	xfrm_state_put(x);
  out_noput:
  	return err;
  }
  
  static int verify_userspi_info(struct xfrm_userspi_info *p)
  {
  	switch (p->info.id.proto) {
  	case IPPROTO_AH:
  	case IPPROTO_ESP:
  		break;
  
  	case IPPROTO_COMP:
  		/* IPCOMP spi is 16-bits. */
  		if (p->max >= 0x10000)
  			return -EINVAL;
  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	if (p->min > p->max)
  		return -EINVAL;
  
  	return 0;
  }

  static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_state *x;
  	struct xfrm_userspi_info *p;
  	struct sk_buff *resp_skb;
  	xfrm_address_t *daddr;
  	int family;
  	int err;

  	u32 mark;
  	struct xfrm_mark m;

  	p = nlmsg_data(nlh);

  	err = verify_userspi_info(p);
  	if (err)
  		goto out_noput;
  
  	family = p->info.family;
  	daddr = &p->info.id.daddr;
  
  	x = NULL;

  
  	mark = xfrm_mark_get(attrs, &m);

  	if (p->info.seq) {

  		x = xfrm_find_acq_byseq(net, mark, p->info.seq);

  		if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
  			xfrm_state_put(x);
  			x = NULL;
  		}
  	}
  
  	if (!x)

  		x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,

  				  p->info.id.proto, daddr,
  				  &p->info.saddr, 1,
  				  family);
  	err = -ENOENT;
  	if (x == NULL)
  		goto out_noput;

  	err = xfrm_alloc_spi(x, p->min, p->max);
  	if (err)
  		goto out;

  	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);

  	if (IS_ERR(resp_skb)) {
  		err = PTR_ERR(resp_skb);
  		goto out;
  	}

  	err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);

  
  out:
  	xfrm_state_put(x);
  out_noput:
  	return err;
  }

  static int verify_policy_dir(u8 dir)

  {
  	switch (dir) {
  	case XFRM_POLICY_IN:
  	case XFRM_POLICY_OUT:
  	case XFRM_POLICY_FWD:
  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	return 0;
  }

  static int verify_policy_type(u8 type)

  {
  	switch (type) {
  	case XFRM_POLICY_TYPE_MAIN:
  #ifdef CONFIG_XFRM_SUB_POLICY
  	case XFRM_POLICY_TYPE_SUB:
  #endif
  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	return 0;
  }

  static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
  {
  	switch (p->share) {
  	case XFRM_SHARE_ANY:
  	case XFRM_SHARE_SESSION:
  	case XFRM_SHARE_USER:
  	case XFRM_SHARE_UNIQUE:
  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	switch (p->action) {
  	case XFRM_POLICY_ALLOW:
  	case XFRM_POLICY_BLOCK:
  		break;
  
  	default:
  		return -EINVAL;

  	}

  
  	switch (p->sel.family) {
  	case AF_INET:
  		break;
  
  	case AF_INET6:

  #if IS_ENABLED(CONFIG_IPV6)

  		break;
  #else
  		return  -EAFNOSUPPORT;
  #endif
  
  	default:
  		return -EINVAL;

  	}

  
  	return verify_policy_dir(p->dir);
  }

  static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)

  {

  	struct nlattr *rt = attrs[XFRMA_SEC_CTX];

  	struct xfrm_user_sec_ctx *uctx;
  
  	if (!rt)
  		return 0;

  	uctx = nla_data(rt);

  	return security_xfrm_policy_alloc(&pol->security, uctx);

  }

  static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
  			   int nr)
  {
  	int i;
  
  	xp->xfrm_nr = nr;
  	for (i = 0; i < nr; i++, ut++) {
  		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
  
  		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
  		memcpy(&t->saddr, &ut->saddr,
  		       sizeof(xfrm_address_t));
  		t->reqid = ut->reqid;
  		t->mode = ut->mode;
  		t->share = ut->share;
  		t->optional = ut->optional;
  		t->aalgos = ut->aalgos;
  		t->ealgos = ut->ealgos;
  		t->calgos = ut->calgos;

  		/* If all masks are ~0, then we allow all algorithms. */
  		t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);

  		t->encap_family = ut->family;

  	}
  }

  static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
  {
  	int i;
  
  	if (nr > XFRM_MAX_DEPTH)
  		return -EINVAL;
  
  	for (i = 0; i < nr; i++) {
  		/* We never validated the ut->family value, so many
  		 * applications simply leave it at zero.  The check was
  		 * never made and ut->family was ignored because all
  		 * templates could be assumed to have the same family as
  		 * the policy itself.  Now that we will have ipv4-in-ipv6
  		 * and ipv6-in-ipv4 tunnels, this is no longer true.
  		 */
  		if (!ut[i].family)
  			ut[i].family = family;
  
  		switch (ut[i].family) {
  		case AF_INET:
  			break;

  #if IS_ENABLED(CONFIG_IPV6)

  		case AF_INET6:
  			break;
  #endif
  		default:
  			return -EINVAL;

  		}

  	}
  
  	return 0;
  }

  static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)

  {

  	struct nlattr *rt = attrs[XFRMA_TMPL];

  
  	if (!rt) {
  		pol->xfrm_nr = 0;
  	} else {

  		struct xfrm_user_tmpl *utmpl = nla_data(rt);
  		int nr = nla_len(rt) / sizeof(*utmpl);

  		int err;

  		err = validate_tmpl(nr, utmpl, pol->family);
  		if (err)
  			return err;

  		copy_templates(pol, utmpl, nr);

  	}
  	return 0;
  }

  static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)

  {

  	struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];

  	struct xfrm_userpolicy_type *upt;

  	u8 type = XFRM_POLICY_TYPE_MAIN;

  	int err;
  
  	if (rt) {

  		upt = nla_data(rt);

  		type = upt->type;
  	}
  
  	err = verify_policy_type(type);
  	if (err)
  		return err;
  
  	*tp = type;
  	return 0;
  }

  static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
  {
  	xp->priority = p->priority;
  	xp->index = p->index;
  	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
  	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
  	xp->action = p->action;
  	xp->flags = p->flags;
  	xp->family = p->sel.family;
  	/* XXX xp->share = p->share; */
  }
  
  static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
  {
  	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
  	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
  	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
  	p->priority = xp->priority;
  	p->index = xp->index;
  	p->sel.family = xp->family;
  	p->dir = dir;
  	p->action = xp->action;
  	p->flags = xp->flags;
  	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
  }

  static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)

  {

  	struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);

  	int err;
  
  	if (!xp) {
  		*errp = -ENOMEM;
  		return NULL;
  	}
  
  	copy_from_user_policy(xp, p);

  	err = copy_from_user_policy_type(&xp->type, attrs);

  	if (err)
  		goto error;

  	if (!(err = copy_from_user_tmpl(xp, attrs)))
  		err = copy_from_user_sec_ctx(xp, attrs);

  	if (err)
  		goto error;

  	xfrm_mark_get(attrs, &xp->mark);

  	return xp;

   error:
  	*errp = err;

  	xp->walk.dead = 1;

  	xfrm_policy_destroy(xp);

  	return NULL;

  }

  static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_userpolicy_info *p = nlmsg_data(nlh);

  	struct xfrm_policy *xp;

  	struct km_event c;

  	int err;
  	int excl;

  	uid_t loginuid = audit_get_loginuid(current);
  	u32 sessionid = audit_get_sessionid(current);
  	u32 sid;

  
  	err = verify_newpolicy_info(p);
  	if (err)
  		return err;

  	err = verify_sec_ctx_len(attrs);

  	if (err)
  		return err;

  	xp = xfrm_policy_construct(net, p, attrs, &err);

  	if (!xp)
  		return err;

  	/* shouldn't excl be based on nlh flags??

  	 * Aha! this is anti-netlink really i.e  more pfkey derived
  	 * in netlink excl is a flag and you wouldnt need
  	 * a type XFRM_MSG_UPDPOLICY - JHS */

  	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
  	err = xfrm_policy_insert(p->dir, xp, excl);

  	security_task_getsecid(current, &sid);

  	xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);

  	if (err) {

  		security_xfrm_policy_free(xp->security);

  		kfree(xp);
  		return err;
  	}

  	c.event = nlh->nlmsg_type;

  	c.seq = nlh->nlmsg_seq;
  	c.pid = nlh->nlmsg_pid;
  	km_policy_notify(xp, p->dir, &c);

  	xfrm_pol_put(xp);
  
  	return 0;
  }
  
  static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
  {
  	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
  	int i;
  
  	if (xp->xfrm_nr == 0)
  		return 0;
  
  	for (i = 0; i < xp->xfrm_nr; i++) {
  		struct xfrm_user_tmpl *up = &vec[i];
  		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
  
  		memcpy(&up->id, &kp->id, sizeof(up->id));

  		up->family = kp->encap_family;

  		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
  		up->reqid = kp->reqid;
  		up->mode = kp->mode;
  		up->share = kp->share;
  		up->optional = kp->optional;
  		up->aalgos = kp->aalgos;
  		up->ealgos = kp->ealgos;
  		up->calgos = kp->calgos;
  	}

  	return nla_put(skb, XFRMA_TMPL,
  		       sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);

  }
  
  static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
  {
  	if (x->security) {
  		return copy_sec_ctx(x->security, skb);

  	}
  	return 0;

  }

  static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
  {
  	if (xp->security) {
  		return copy_sec_ctx(xp->security, skb);
  	}
  	return 0;

  }

  static inline size_t userpolicy_type_attrsize(void)
  {
  #ifdef CONFIG_XFRM_SUB_POLICY
  	return nla_total_size(sizeof(struct xfrm_userpolicy_type));
  #else
  	return 0;
  #endif
  }

  #ifdef CONFIG_XFRM_SUB_POLICY

  static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)

  {

  	struct xfrm_userpolicy_type upt = {
  		.type = type,
  	};

  	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);

  }
  
  #else

  static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)

  {
  	return 0;
  }
  #endif

  static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
  {
  	struct xfrm_dump_info *sp = ptr;
  	struct xfrm_userpolicy_info *p;
  	struct sk_buff *in_skb = sp->in_skb;
  	struct sk_buff *skb = sp->out_skb;
  	struct nlmsghdr *nlh;

  	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
  			XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
  	if (nlh == NULL)
  		return -EMSGSIZE;

  	p = nlmsg_data(nlh);

  	copy_to_user_policy(xp, p, dir);
  	if (copy_to_user_tmpl(xp, skb) < 0)
  		goto nlmsg_failure;

  	if (copy_to_user_sec_ctx(xp, skb))
  		goto nlmsg_failure;

  	if (copy_to_user_policy_type(xp->type, skb) < 0)

  		goto nlmsg_failure;

  	if (xfrm_mark_put(skb, &xp->mark))
  		goto nla_put_failure;

  	nlmsg_end(skb, nlh);

  	return 0;

  nla_put_failure:

  nlmsg_failure:

  	nlmsg_cancel(skb, nlh);
  	return -EMSGSIZE;

  }

  static int xfrm_dump_policy_done(struct netlink_callback *cb)
  {
  	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
  
  	xfrm_policy_walk_done(walk);
  	return 0;
  }

  static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];

  	struct xfrm_dump_info info;

  	BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
  		     sizeof(cb->args) - sizeof(cb->args[0]));

  	info.in_skb = cb->skb;
  	info.out_skb = skb;
  	info.nlmsg_seq = cb->nlh->nlmsg_seq;
  	info.nlmsg_flags = NLM_F_MULTI;

  
  	if (!cb->args[0]) {
  		cb->args[0] = 1;
  		xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
  	}

  	(void) xfrm_policy_walk(net, walk, dump_one_policy, &info);

  
  	return skb->len;
  }
  
  static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
  					  struct xfrm_policy *xp,
  					  int dir, u32 seq)
  {
  	struct xfrm_dump_info info;
  	struct sk_buff *skb;

  	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);

  	if (!skb)
  		return ERR_PTR(-ENOMEM);

  	info.in_skb = in_skb;
  	info.out_skb = skb;
  	info.nlmsg_seq = seq;
  	info.nlmsg_flags = 0;

  
  	if (dump_one_policy(xp, dir, 0, &info) < 0) {
  		kfree_skb(skb);
  		return NULL;
  	}
  
  	return skb;
  }

  static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_policy *xp;
  	struct xfrm_userpolicy_id *p;

  	u8 type = XFRM_POLICY_TYPE_MAIN;

  	int err;

  	struct km_event c;

  	int delete;

  	struct xfrm_mark m;
  	u32 mark = xfrm_mark_get(attrs, &m);

  	p = nlmsg_data(nlh);

  	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;

  	err = copy_from_user_policy_type(&type, attrs);

  	if (err)
  		return err;

  	err = verify_policy_dir(p->dir);
  	if (err)
  		return err;
  
  	if (p->index)

  		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);

  	else {

  		struct nlattr *rt = attrs[XFRMA_SEC_CTX];

  		struct xfrm_sec_ctx *ctx;

  		err = verify_sec_ctx_len(attrs);

  		if (err)
  			return err;

  		ctx = NULL;

  		if (rt) {

  			struct xfrm_user_sec_ctx *uctx = nla_data(rt);

  			err = security_xfrm_policy_alloc(&ctx, uctx);
  			if (err)

  				return err;

  		}

  		xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,

  					   ctx, delete, &err);

  		security_xfrm_policy_free(ctx);

  	}

  	if (xp == NULL)
  		return -ENOENT;
  
  	if (!delete) {
  		struct sk_buff *resp_skb;
  
  		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
  		if (IS_ERR(resp_skb)) {
  			err = PTR_ERR(resp_skb);
  		} else {

  			err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,

  					    NETLINK_CB(skb).pid);

  		}

  	} else {

  		uid_t loginuid = audit_get_loginuid(current);
  		u32 sessionid = audit_get_sessionid(current);
  		u32 sid;

  		security_task_getsecid(current, &sid);

  		xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
  					 sid);

  
  		if (err != 0)

  			goto out;

  		c.data.byid = p->index;

  		c.event = nlh->nlmsg_type;

  		c.seq = nlh->nlmsg_seq;
  		c.pid = nlh->nlmsg_pid;
  		km_policy_notify(xp, p->dir, &c);

  	}

  out:

  	xfrm_pol_put(xp);

  	return err;
  }

  static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct km_event c;

  	struct xfrm_usersa_flush *p = nlmsg_data(nlh);

  	struct xfrm_audit audit_info;

  	int err;

  	audit_info.loginuid = audit_get_loginuid(current);
  	audit_info.sessionid = audit_get_sessionid(current);
  	security_task_getsecid(current, &audit_info.secid);

  	err = xfrm_state_flush(net, p->proto, &audit_info);

  	if (err) {
  		if (err == -ESRCH) /* empty table */
  			return 0;

  		return err;

  	}

  	c.data.proto = p->proto;

  	c.event = nlh->nlmsg_type;

  	c.seq = nlh->nlmsg_seq;
  	c.pid = nlh->nlmsg_pid;

  	c.net = net;

  	km_state_notify(NULL, &c);

  	return 0;
  }

  static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)

  {

  	size_t replay_size = x->replay_esn ?
  			      xfrm_replay_state_esn_len(x->replay_esn) :
  			      sizeof(struct xfrm_replay_state);

  	return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))

  	       + nla_total_size(replay_size)

  	       + nla_total_size(sizeof(struct xfrm_lifetime_cur))

  	       + nla_total_size(sizeof(struct xfrm_mark))

  	       + nla_total_size(4) /* XFRM_AE_RTHR */
  	       + nla_total_size(4); /* XFRM_AE_ETHR */
  }

  static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)

  {
  	struct xfrm_aevent_id *id;
  	struct nlmsghdr *nlh;

  	nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
  	if (nlh == NULL)
  		return -EMSGSIZE;

  	id = nlmsg_data(nlh);

  	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));

  	id->sa_id.spi = x->id.spi;
  	id->sa_id.family = x->props.family;
  	id->sa_id.proto = x->id.proto;

  	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
  	id->reqid = x->props.reqid;

  	id->flags = c->data.aevent;

  	if (x->replay_esn)
  		NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
  			xfrm_replay_state_esn_len(x->replay_esn),
  			x->replay_esn);
  	else
  		NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);

  	NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);

  	if (id->flags & XFRM_AE_RTHR)
  		NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);

  	if (id->flags & XFRM_AE_ETHR)
  		NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
  			    x->replay_maxage * 10 / HZ);

  	if (xfrm_mark_put(skb, &x->mark))
  		goto nla_put_failure;

  	return nlmsg_end(skb, nlh);

  nla_put_failure:

  	nlmsg_cancel(skb, nlh);
  	return -EMSGSIZE;

  }

  static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);

  	struct xfrm_state *x;
  	struct sk_buff *r_skb;
  	int err;
  	struct km_event c;

  	u32 mark;
  	struct xfrm_mark m;

  	struct xfrm_aevent_id *p = nlmsg_data(nlh);

  	struct xfrm_usersa_id *id = &p->sa_id;

  	mark = xfrm_mark_get(attrs, &m);
  
  	x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);

  	if (x == NULL)

  		return -ESRCH;

  
  	r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
  	if (r_skb == NULL) {
  		xfrm_state_put(x);
  		return -ENOMEM;

  	}
  
  	/*
  	 * XXX: is this lock really needed - none of the other
  	 * gets lock (the concern is things getting updated
  	 * while we are still reading) - jhs
  	*/
  	spin_lock_bh(&x->lock);
  	c.data.aevent = p->flags;
  	c.seq = nlh->nlmsg_seq;
  	c.pid = nlh->nlmsg_pid;
  
  	if (build_aevent(r_skb, x, &c) < 0)
  		BUG();

  	err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);

  	spin_unlock_bh(&x->lock);
  	xfrm_state_put(x);
  	return err;
  }

  static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,

  		struct nlattr **attrs)

  {

  	struct net *net = sock_net(skb->sk);