text: /*
   * net/key/af_key.c	An implementation of PF_KEYv2 sockets.
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   *
   * Authors:	Maxim Giryaev	<gem@asplinux.ru>
   *		David S. Miller	<davem@redhat.com>
   *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
   *		Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   *		Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
   *		Derek Atkins <derek@ihtfp.com>
   */
  
  #include <linux/capability.h>
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/socket.h>
  #include <linux/pfkeyv2.h>
  #include <linux/ipsec.h>
  #include <linux/skbuff.h>
  #include <linux/rtnetlink.h>
  #include <linux/in.h>
  #include <linux/in6.h>
  #include <linux/proc_fs.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <net/net_namespace.h>
  #include <net/netns/generic.h>
  #include <net/xfrm.h>
  
  #include <net/sock.h>
  
  #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  
  static int pfkey_net_id __read_mostly;
  struct netns_pfkey {
  	/* List of all pfkey sockets. */
  	struct hlist_head table;
  	atomic_t socks_nr;
  };
  static DEFINE_MUTEX(pfkey_mutex);
  
  #define DUMMY_MARK 0
  static struct xfrm_mark dummy_mark = {0, 0};
  struct pfkey_sock {
  	/* struct sock must be the first member of struct pfkey_sock */
  	struct sock	sk;
  	int		registered;
  	int		promisc;
  
  	struct {
  		uint8_t		msg_version;
  		uint32_t	msg_portid;
  		int		(*dump)(struct pfkey_sock *sk);
  		void		(*done)(struct pfkey_sock *sk);
  		union {
  			struct xfrm_policy_walk	policy;
  			struct xfrm_state_walk	state;
  		} u;
  		struct sk_buff	*skb;
  	} dump;
  };
  
  static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  {
  	return (struct pfkey_sock *)sk;
  }
  
  static int pfkey_can_dump(const struct sock *sk)
  {
  	if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  		return 1;
  	return 0;
  }
  
  static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  {
  	if (pfk->dump.dump) {
  		if (pfk->dump.skb) {
  			kfree_skb(pfk->dump.skb);
  			pfk->dump.skb = NULL;
  		}
  		pfk->dump.done(pfk);
  		pfk->dump.dump = NULL;
  		pfk->dump.done = NULL;
  	}
  }
  
  static void pfkey_sock_destruct(struct sock *sk)
  {
  	struct net *net = sock_net(sk);
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	pfkey_terminate_dump(pfkey_sk(sk));
  	skb_queue_purge(&sk->sk_receive_queue);
  
  	if (!sock_flag(sk, SOCK_DEAD)) {
  		pr_err("Attempt to release alive pfkey socket: %p\n", sk);
  		return;
  	}
  
  	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
  	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
  
  	atomic_dec(&net_pfkey->socks_nr);
  }
  
  static const struct proto_ops pfkey_ops;
  
  static void pfkey_insert(struct sock *sk)
  {
  	struct net *net = sock_net(sk);
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	mutex_lock(&pfkey_mutex);
  	sk_add_node_rcu(sk, &net_pfkey->table);
  	mutex_unlock(&pfkey_mutex);
  }
  
  static void pfkey_remove(struct sock *sk)
  {
  	mutex_lock(&pfkey_mutex);
  	sk_del_node_init_rcu(sk);
  	mutex_unlock(&pfkey_mutex);
  }
  
  static struct proto key_proto = {
  	.name	  = "KEY",
  	.owner	  = THIS_MODULE,
  	.obj_size = sizeof(struct pfkey_sock),
  };
  
  static int pfkey_create(struct net *net, struct socket *sock, int protocol,
  			int kern)
  {
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  	struct sock *sk;
  	int err;
  
  	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  		return -EPERM;
  	if (sock->type != SOCK_RAW)
  		return -ESOCKTNOSUPPORT;
  	if (protocol != PF_KEY_V2)
  		return -EPROTONOSUPPORT;
  
  	err = -ENOMEM;
  	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
  	if (sk == NULL)
  		goto out;
  
  	sock->ops = &pfkey_ops;
  	sock_init_data(sock, sk);
  
  	sk->sk_family = PF_KEY;
  	sk->sk_destruct = pfkey_sock_destruct;
  
  	atomic_inc(&net_pfkey->socks_nr);
  
  	pfkey_insert(sk);
  
  	return 0;
  out:
  	return err;
  }
  
  static int pfkey_release(struct socket *sock)
  {
  	struct sock *sk = sock->sk;
  
  	if (!sk)
  		return 0;
  
  	pfkey_remove(sk);
  
  	sock_orphan(sk);
  	sock->sk = NULL;
  	skb_queue_purge(&sk->sk_write_queue);
  
  	synchronize_rcu();
  	sock_put(sk);
  
  	return 0;
  }
  
  static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
  			       gfp_t allocation, struct sock *sk)
  {
  	int err = -ENOBUFS;
  
  	sock_hold(sk);
  	if (*skb2 == NULL) {
  		if (atomic_read(&skb->users) != 1) {
  			*skb2 = skb_clone(skb, allocation);
  		} else {
  			*skb2 = skb;
  			atomic_inc(&skb->users);
  		}
  	}
  	if (*skb2 != NULL) {
  		if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
  			skb_set_owner_r(*skb2, sk);
  			skb_queue_tail(&sk->sk_receive_queue, *skb2);
  			sk->sk_data_ready(sk, (*skb2)->len);
  			*skb2 = NULL;
  			err = 0;
  		}
  	}
  	sock_put(sk);
  	return err;
  }
  
  /* Send SKB to all pfkey sockets matching selected criteria.  */
  #define BROADCAST_ALL		0
  #define BROADCAST_ONE		1
  #define BROADCAST_REGISTERED	2
  #define BROADCAST_PROMISC_ONLY	4
  static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
  			   int broadcast_flags, struct sock *one_sk,
  			   struct net *net)
  {
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  	struct sock *sk;
  	struct sk_buff *skb2 = NULL;
  	int err = -ESRCH;
  
  	/* XXX Do we need something like netlink_overrun?  I think
  	 * XXX PF_KEY socket apps will not mind current behavior.
  	 */
  	if (!skb)
  		return -ENOMEM;
  
  	rcu_read_lock();
  	sk_for_each_rcu(sk, &net_pfkey->table) {
  		struct pfkey_sock *pfk = pfkey_sk(sk);
  		int err2;
  
  		/* Yes, it means that if you are meant to receive this
  		 * pfkey message you receive it twice as promiscuous
  		 * socket.
  		 */
  		if (pfk->promisc)
  			pfkey_broadcast_one(skb, &skb2, allocation, sk);
  
  		/* the exact target will be processed later */
  		if (sk == one_sk)
  			continue;
  		if (broadcast_flags != BROADCAST_ALL) {
  			if (broadcast_flags & BROADCAST_PROMISC_ONLY)
  				continue;
  			if ((broadcast_flags & BROADCAST_REGISTERED) &&
  			    !pfk->registered)
  				continue;
  			if (broadcast_flags & BROADCAST_ONE)
  				continue;
  		}
  
  		err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
  
  		/* Error is cleare after succecful sending to at least one
  		 * registered KM */
  		if ((broadcast_flags & BROADCAST_REGISTERED) && err)
  			err = err2;
  	}
  	rcu_read_unlock();
  
  	if (one_sk != NULL)
  		err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
  
  	kfree_skb(skb2);
  	kfree_skb(skb);
  	return err;
  }
  
  static int pfkey_do_dump(struct pfkey_sock *pfk)
  {
  	struct sadb_msg *hdr;
  	int rc;
  
  	rc = pfk->dump.dump(pfk);
  	if (rc == -ENOBUFS)
  		return 0;
  
  	if (pfk->dump.skb) {
  		if (!pfkey_can_dump(&pfk->sk))
  			return 0;
  
  		hdr = (struct sadb_msg *) pfk->dump.skb->data;
  		hdr->sadb_msg_seq = 0;
  		hdr->sadb_msg_errno = rc;
  		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
  				&pfk->sk, sock_net(&pfk->sk));
  		pfk->dump.skb = NULL;
  	}
  
  	pfkey_terminate_dump(pfk);
  	return rc;
  }
  
  static inline void pfkey_hdr_dup(struct sadb_msg *new,
  				 const struct sadb_msg *orig)
  {
  	*new = *orig;
  }
  
  static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
  {
  	struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
  	struct sadb_msg *hdr;
  
  	if (!skb)
  		return -ENOBUFS;
  
  	/* Woe be to the platform trying to support PFKEY yet
  	 * having normal errnos outside the 1-255 range, inclusive.
  	 */
  	err = -err;
  	if (err == ERESTARTSYS ||
  	    err == ERESTARTNOHAND ||
  	    err == ERESTARTNOINTR)
  		err = EINTR;
  	if (err >= 512)
  		err = EINVAL;
  	BUG_ON(err <= 0 || err >= 256);
  
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	pfkey_hdr_dup(hdr, orig);
  	hdr->sadb_msg_errno = (uint8_t) err;
  	hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
  			     sizeof(uint64_t));
  
  	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
  
  	return 0;
  }
  
  static u8 sadb_ext_min_len[] = {
  	[SADB_EXT_RESERVED]		= (u8) 0,
  	[SADB_EXT_SA]			= (u8) sizeof(struct sadb_sa),
  	[SADB_EXT_LIFETIME_CURRENT]	= (u8) sizeof(struct sadb_lifetime),
  	[SADB_EXT_LIFETIME_HARD]	= (u8) sizeof(struct sadb_lifetime),
  	[SADB_EXT_LIFETIME_SOFT]	= (u8) sizeof(struct sadb_lifetime),
  	[SADB_EXT_ADDRESS_SRC]		= (u8) sizeof(struct sadb_address),
  	[SADB_EXT_ADDRESS_DST]		= (u8) sizeof(struct sadb_address),
  	[SADB_EXT_ADDRESS_PROXY]	= (u8) sizeof(struct sadb_address),
  	[SADB_EXT_KEY_AUTH]		= (u8) sizeof(struct sadb_key),
  	[SADB_EXT_KEY_ENCRYPT]		= (u8) sizeof(struct sadb_key),
  	[SADB_EXT_IDENTITY_SRC]		= (u8) sizeof(struct sadb_ident),
  	[SADB_EXT_IDENTITY_DST]		= (u8) sizeof(struct sadb_ident),
  	[SADB_EXT_SENSITIVITY]		= (u8) sizeof(struct sadb_sens),
  	[SADB_EXT_PROPOSAL]		= (u8) sizeof(struct sadb_prop),
  	[SADB_EXT_SUPPORTED_AUTH]	= (u8) sizeof(struct sadb_supported),
  	[SADB_EXT_SUPPORTED_ENCRYPT]	= (u8) sizeof(struct sadb_supported),
  	[SADB_EXT_SPIRANGE]		= (u8) sizeof(struct sadb_spirange),
  	[SADB_X_EXT_KMPRIVATE]		= (u8) sizeof(struct sadb_x_kmprivate),
  	[SADB_X_EXT_POLICY]		= (u8) sizeof(struct sadb_x_policy),
  	[SADB_X_EXT_SA2]		= (u8) sizeof(struct sadb_x_sa2),
  	[SADB_X_EXT_NAT_T_TYPE]		= (u8) sizeof(struct sadb_x_nat_t_type),
  	[SADB_X_EXT_NAT_T_SPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
  	[SADB_X_EXT_NAT_T_DPORT]	= (u8) sizeof(struct sadb_x_nat_t_port),
  	[SADB_X_EXT_NAT_T_OA]		= (u8) sizeof(struct sadb_address),
  	[SADB_X_EXT_SEC_CTX]		= (u8) sizeof(struct sadb_x_sec_ctx),
  	[SADB_X_EXT_KMADDRESS]		= (u8) sizeof(struct sadb_x_kmaddress),
  };
  
  /* Verify sadb_address_{len,prefixlen} against sa_family.  */
  static int verify_address_len(const void *p)
  {
  	const struct sadb_address *sp = p;
  	const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
  	const struct sockaddr_in *sin;
  #if IS_ENABLED(CONFIG_IPV6)
  	const struct sockaddr_in6 *sin6;
  #endif
  	int len;
  
  	switch (addr->sa_family) {
  	case AF_INET:
  		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
  		if (sp->sadb_address_len != len ||
  		    sp->sadb_address_prefixlen > 32)
  			return -EINVAL;
  		break;
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
  		if (sp->sadb_address_len != len ||
  		    sp->sadb_address_prefixlen > 128)
  			return -EINVAL;
  		break;
  #endif
  	default:
  		/* It is user using kernel to keep track of security
  		 * associations for another protocol, such as
  		 * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
  		 * lengths.
  		 *
  		 * XXX Actually, association/policy database is not yet
  		 * XXX able to cope with arbitrary sockaddr families.
  		 * XXX When it can, remove this -EINVAL.  -DaveM
  		 */
  		return -EINVAL;
  		break;
  	}
  
  	return 0;
  }
  
  static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
  {
  	return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
  			    sec_ctx->sadb_x_ctx_len,
  			    sizeof(uint64_t));
  }
  
  static inline int verify_sec_ctx_len(const void *p)
  {
  	const struct sadb_x_sec_ctx *sec_ctx = p;
  	int len = sec_ctx->sadb_x_ctx_len;
  
  	if (len > PAGE_SIZE)
  		return -EINVAL;
  
  	len = pfkey_sec_ctx_len(sec_ctx);
  
  	if (sec_ctx->sadb_x_sec_len != len)
  		return -EINVAL;
  
  	return 0;
  }
  
  static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
  {
  	struct xfrm_user_sec_ctx *uctx = NULL;
  	int ctx_size = sec_ctx->sadb_x_ctx_len;
  
  	uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
  
  	if (!uctx)
  		return NULL;
  
  	uctx->len = pfkey_sec_ctx_len(sec_ctx);
  	uctx->exttype = sec_ctx->sadb_x_sec_exttype;
  	uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
  	uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
  	uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
  	memcpy(uctx + 1, sec_ctx + 1,
  	       uctx->ctx_len);
  
  	return uctx;
  }
  
  static int present_and_same_family(const struct sadb_address *src,
  				   const struct sadb_address *dst)
  {
  	const struct sockaddr *s_addr, *d_addr;
  
  	if (!src || !dst)
  		return 0;
  
  	s_addr = (const struct sockaddr *)(src + 1);
  	d_addr = (const struct sockaddr *)(dst + 1);
  	if (s_addr->sa_family != d_addr->sa_family)
  		return 0;
  	if (s_addr->sa_family != AF_INET
  #if IS_ENABLED(CONFIG_IPV6)
  	    && s_addr->sa_family != AF_INET6
  #endif
  		)
  		return 0;
  
  	return 1;
  }
  
  static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
  {
  	const char *p = (char *) hdr;
  	int len = skb->len;
  
  	len -= sizeof(*hdr);
  	p += sizeof(*hdr);
  	while (len > 0) {
  		const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
  		uint16_t ext_type;
  		int ext_len;
  
  		ext_len  = ehdr->sadb_ext_len;
  		ext_len *= sizeof(uint64_t);
  		ext_type = ehdr->sadb_ext_type;
  		if (ext_len < sizeof(uint64_t) ||
  		    ext_len > len ||
  		    ext_type == SADB_EXT_RESERVED)
  			return -EINVAL;
  
  		if (ext_type <= SADB_EXT_MAX) {
  			int min = (int) sadb_ext_min_len[ext_type];
  			if (ext_len < min)
  				return -EINVAL;
  			if (ext_hdrs[ext_type-1] != NULL)
  				return -EINVAL;
  			if (ext_type == SADB_EXT_ADDRESS_SRC ||
  			    ext_type == SADB_EXT_ADDRESS_DST ||
  			    ext_type == SADB_EXT_ADDRESS_PROXY ||
  			    ext_type == SADB_X_EXT_NAT_T_OA) {
  				if (verify_address_len(p))
  					return -EINVAL;
  			}
  			if (ext_type == SADB_X_EXT_SEC_CTX) {
  				if (verify_sec_ctx_len(p))
  					return -EINVAL;
  			}
  			ext_hdrs[ext_type-1] = (void *) p;
  		}
  		p   += ext_len;
  		len -= ext_len;
  	}
  
  	return 0;
  }
  
  static uint16_t
  pfkey_satype2proto(uint8_t satype)
  {
  	switch (satype) {
  	case SADB_SATYPE_UNSPEC:
  		return IPSEC_PROTO_ANY;
  	case SADB_SATYPE_AH:
  		return IPPROTO_AH;
  	case SADB_SATYPE_ESP:
  		return IPPROTO_ESP;
  	case SADB_X_SATYPE_IPCOMP:
  		return IPPROTO_COMP;
  		break;
  	default:
  		return 0;
  	}
  	/* NOTREACHED */
  }
  
  static uint8_t
  pfkey_proto2satype(uint16_t proto)
  {
  	switch (proto) {
  	case IPPROTO_AH:
  		return SADB_SATYPE_AH;
  	case IPPROTO_ESP:
  		return SADB_SATYPE_ESP;
  	case IPPROTO_COMP:
  		return SADB_X_SATYPE_IPCOMP;
  		break;
  	default:
  		return 0;
  	}
  	/* NOTREACHED */
  }
  
  /* BTW, this scheme means that there is no way with PFKEY2 sockets to
   * say specifically 'just raw sockets' as we encode them as 255.
   */
  
  static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
  {
  	return proto == IPSEC_PROTO_ANY ? 0 : proto;
  }
  
  static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
  {
  	return proto ? proto : IPSEC_PROTO_ANY;
  }
  
  static inline int pfkey_sockaddr_len(sa_family_t family)
  {
  	switch (family) {
  	case AF_INET:
  		return sizeof(struct sockaddr_in);
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		return sizeof(struct sockaddr_in6);
  #endif
  	}
  	return 0;
  }
  
  static
  int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
  {
  	switch (sa->sa_family) {
  	case AF_INET:
  		xaddr->a4 =
  			((struct sockaddr_in *)sa)->sin_addr.s_addr;
  		return AF_INET;
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		memcpy(xaddr->a6,
  		       &((struct sockaddr_in6 *)sa)->sin6_addr,
  		       sizeof(struct in6_addr));
  		return AF_INET6;
  #endif
  	}
  	return 0;
  }
  
  static
  int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
  {
  	return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
  				      xaddr);
  }
  
  static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	const struct sadb_sa *sa;
  	const struct sadb_address *addr;
  	uint16_t proto;
  	unsigned short family;
  	xfrm_address_t *xaddr;
  
  	sa = ext_hdrs[SADB_EXT_SA - 1];
  	if (sa == NULL)
  		return NULL;
  
  	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
  	if (proto == 0)
  		return NULL;
  
  	/* sadb_address_len should be checked by caller */
  	addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
  	if (addr == NULL)
  		return NULL;
  
  	family = ((const struct sockaddr *)(addr + 1))->sa_family;
  	switch (family) {
  	case AF_INET:
  		xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
  		break;
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
  		break;
  #endif
  	default:
  		xaddr = NULL;
  	}
  
  	if (!xaddr)
  		return NULL;
  
  	return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
  }
  
  #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
  
  static int
  pfkey_sockaddr_size(sa_family_t family)
  {
  	return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
  }
  
  static inline int pfkey_mode_from_xfrm(int mode)
  {
  	switch(mode) {
  	case XFRM_MODE_TRANSPORT:
  		return IPSEC_MODE_TRANSPORT;
  	case XFRM_MODE_TUNNEL:
  		return IPSEC_MODE_TUNNEL;
  	case XFRM_MODE_BEET:
  		return IPSEC_MODE_BEET;
  	default:
  		return -1;
  	}
  }
  
  static inline int pfkey_mode_to_xfrm(int mode)
  {
  	switch(mode) {
  	case IPSEC_MODE_ANY:	/*XXX*/
  	case IPSEC_MODE_TRANSPORT:
  		return XFRM_MODE_TRANSPORT;
  	case IPSEC_MODE_TUNNEL:
  		return XFRM_MODE_TUNNEL;
  	case IPSEC_MODE_BEET:
  		return XFRM_MODE_BEET;
  	default:
  		return -1;
  	}
  }
  
  static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
  					struct sockaddr *sa,
  					unsigned short family)
  {
  	switch (family) {
  	case AF_INET:
  	    {
  		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
  		sin->sin_family = AF_INET;
  		sin->sin_port = port;
  		sin->sin_addr.s_addr = xaddr->a4;
  		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
  		return 32;
  	    }
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  	    {
  		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
  		sin6->sin6_family = AF_INET6;
  		sin6->sin6_port = port;
  		sin6->sin6_flowinfo = 0;
  		sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
  		sin6->sin6_scope_id = 0;
  		return 128;
  	    }
  #endif
  	}
  	return 0;
  }
  
  static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
  					      int add_keys, int hsc)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  	struct sadb_sa *sa;
  	struct sadb_lifetime *lifetime;
  	struct sadb_address *addr;
  	struct sadb_key *key;
  	struct sadb_x_sa2 *sa2;
  	struct sadb_x_sec_ctx *sec_ctx;
  	struct xfrm_sec_ctx *xfrm_ctx;
  	int ctx_size = 0;
  	int size;
  	int auth_key_size = 0;
  	int encrypt_key_size = 0;
  	int sockaddr_size;
  	struct xfrm_encap_tmpl *natt = NULL;
  	int mode;
  
  	/* address family check */
  	sockaddr_size = pfkey_sockaddr_size(x->props.family);
  	if (!sockaddr_size)
  		return ERR_PTR(-EINVAL);
  
  	/* base, SA, (lifetime (HSC),) address(SD), (address(P),)
  	   key(AE), (identity(SD),) (sensitivity)> */
  	size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
  		sizeof(struct sadb_lifetime) +
  		((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
  		((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
  			sizeof(struct sadb_address)*2 +
  				sockaddr_size*2 +
  					sizeof(struct sadb_x_sa2);
  
  	if ((xfrm_ctx = x->security)) {
  		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
  		size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
  	}
  
  	/* identity & sensitivity */
  	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
  		size += sizeof(struct sadb_address) + sockaddr_size;
  
  	if (add_keys) {
  		if (x->aalg && x->aalg->alg_key_len) {
  			auth_key_size =
  				PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
  			size += sizeof(struct sadb_key) + auth_key_size;
  		}
  		if (x->ealg && x->ealg->alg_key_len) {
  			encrypt_key_size =
  				PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
  			size += sizeof(struct sadb_key) + encrypt_key_size;
  		}
  	}
  	if (x->encap)
  		natt = x->encap;
  
  	if (natt && natt->encap_type) {
  		size += sizeof(struct sadb_x_nat_t_type);
  		size += sizeof(struct sadb_x_nat_t_port);
  		size += sizeof(struct sadb_x_nat_t_port);
  	}
  
  	skb =  alloc_skb(size + 16, GFP_ATOMIC);
  	if (skb == NULL)
  		return ERR_PTR(-ENOBUFS);
  
  	/* call should fill header later */
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	memset(hdr, 0, size);	/* XXX do we need this ? */
  	hdr->sadb_msg_len = size / sizeof(uint64_t);
  
  	/* sa */
  	sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
  	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
  	sa->sadb_sa_exttype = SADB_EXT_SA;
  	sa->sadb_sa_spi = x->id.spi;
  	sa->sadb_sa_replay = x->props.replay_window;
  	switch (x->km.state) {
  	case XFRM_STATE_VALID:
  		sa->sadb_sa_state = x->km.dying ?
  			SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
  		break;
  	case XFRM_STATE_ACQ:
  		sa->sadb_sa_state = SADB_SASTATE_LARVAL;
  		break;
  	default:
  		sa->sadb_sa_state = SADB_SASTATE_DEAD;
  		break;
  	}
  	sa->sadb_sa_auth = 0;
  	if (x->aalg) {
  		struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
  		sa->sadb_sa_auth = (a && a->pfkey_supported) ?
  					a->desc.sadb_alg_id : 0;
  	}
  	sa->sadb_sa_encrypt = 0;
  	BUG_ON(x->ealg && x->calg);
  	if (x->ealg) {
  		struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
  		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
  					a->desc.sadb_alg_id : 0;
  	}
  	/* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
  	if (x->calg) {
  		struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
  		sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
  					a->desc.sadb_alg_id : 0;
  	}
  
  	sa->sadb_sa_flags = 0;
  	if (x->props.flags & XFRM_STATE_NOECN)
  		sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
  	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
  		sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
  	if (x->props.flags & XFRM_STATE_NOPMTUDISC)
  		sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
  
  	/* hard time */
  	if (hsc & 2) {
  		lifetime = (struct sadb_lifetime *)  skb_put(skb,
  							     sizeof(struct sadb_lifetime));
  		lifetime->sadb_lifetime_len =
  			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
  		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
  		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
  		lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
  		lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
  	}
  	/* soft time */
  	if (hsc & 1) {
  		lifetime = (struct sadb_lifetime *)  skb_put(skb,
  							     sizeof(struct sadb_lifetime));
  		lifetime->sadb_lifetime_len =
  			sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  		lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
  		lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
  		lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
  		lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
  		lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
  	}
  	/* current time */
  	lifetime = (struct sadb_lifetime *)  skb_put(skb,
  						     sizeof(struct sadb_lifetime));
  	lifetime->sadb_lifetime_len =
  		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
  	lifetime->sadb_lifetime_allocations = x->curlft.packets;
  	lifetime->sadb_lifetime_bytes = x->curlft.bytes;
  	lifetime->sadb_lifetime_addtime = x->curlft.add_time;
  	lifetime->sadb_lifetime_usetime = x->curlft.use_time;
  	/* src address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  	/* "if the ports are non-zero, then the sadb_address_proto field,
  	   normally zero, MUST be filled in with the transport
  	   protocol's number." - RFC2367 */
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(&x->props.saddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	/* dst address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(&x->id.daddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
  			     x->props.family)) {
  		addr = (struct sadb_address*) skb_put(skb,
  			sizeof(struct sadb_address)+sockaddr_size);
  		addr->sadb_address_len =
  			(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  		addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
  		addr->sadb_address_proto =
  			pfkey_proto_from_xfrm(x->sel.proto);
  		addr->sadb_address_prefixlen = x->sel.prefixlen_s;
  		addr->sadb_address_reserved = 0;
  
  		pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	}
  
  	/* auth key */
  	if (add_keys && auth_key_size) {
  		key = (struct sadb_key *) skb_put(skb,
  						  sizeof(struct sadb_key)+auth_key_size);
  		key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
  			sizeof(uint64_t);
  		key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
  		key->sadb_key_bits = x->aalg->alg_key_len;
  		key->sadb_key_reserved = 0;
  		memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
  	}
  	/* encrypt key */
  	if (add_keys && encrypt_key_size) {
  		key = (struct sadb_key *) skb_put(skb,
  						  sizeof(struct sadb_key)+encrypt_key_size);
  		key->sadb_key_len = (sizeof(struct sadb_key) +
  				     encrypt_key_size) / sizeof(uint64_t);
  		key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
  		key->sadb_key_bits = x->ealg->alg_key_len;
  		key->sadb_key_reserved = 0;
  		memcpy(key + 1, x->ealg->alg_key,
  		       (x->ealg->alg_key_len+7)/8);
  	}
  
  	/* sa */
  	sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
  	sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
  	sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  	if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
  		kfree_skb(skb);
  		return ERR_PTR(-EINVAL);
  	}
  	sa2->sadb_x_sa2_mode = mode;
  	sa2->sadb_x_sa2_reserved1 = 0;
  	sa2->sadb_x_sa2_reserved2 = 0;
  	sa2->sadb_x_sa2_sequence = 0;
  	sa2->sadb_x_sa2_reqid = x->props.reqid;
  
  	if (natt && natt->encap_type) {
  		struct sadb_x_nat_t_type *n_type;
  		struct sadb_x_nat_t_port *n_port;
  
  		/* type */
  		n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
  		n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
  		n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
  		n_type->sadb_x_nat_t_type_type = natt->encap_type;
  		n_type->sadb_x_nat_t_type_reserved[0] = 0;
  		n_type->sadb_x_nat_t_type_reserved[1] = 0;
  		n_type->sadb_x_nat_t_type_reserved[2] = 0;
  
  		/* source port */
  		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
  		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
  		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
  		n_port->sadb_x_nat_t_port_port = natt->encap_sport;
  		n_port->sadb_x_nat_t_port_reserved = 0;
  
  		/* dest port */
  		n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
  		n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
  		n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
  		n_port->sadb_x_nat_t_port_port = natt->encap_dport;
  		n_port->sadb_x_nat_t_port_reserved = 0;
  	}
  
  	/* security context */
  	if (xfrm_ctx) {
  		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
  				sizeof(struct sadb_x_sec_ctx) + ctx_size);
  		sec_ctx->sadb_x_sec_len =
  		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
  		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
  		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
  		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
  		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
  		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
  		       xfrm_ctx->ctx_len);
  	}
  
  	return skb;
  }
  
  
  static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
  {
  	struct sk_buff *skb;
  
  	skb = __pfkey_xfrm_state2msg(x, 1, 3);
  
  	return skb;
  }
  
  static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
  							  int hsc)
  {
  	return __pfkey_xfrm_state2msg(x, 0, hsc);
  }
  
  static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
  						const struct sadb_msg *hdr,
  						void * const *ext_hdrs)
  {
  	struct xfrm_state *x;
  	const struct sadb_lifetime *lifetime;
  	const struct sadb_sa *sa;
  	const struct sadb_key *key;
  	const struct sadb_x_sec_ctx *sec_ctx;
  	uint16_t proto;
  	int err;
  
  
  	sa = ext_hdrs[SADB_EXT_SA - 1];
  	if (!sa ||
  	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
  		return ERR_PTR(-EINVAL);
  	if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
  	    !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
  		return ERR_PTR(-EINVAL);
  	if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
  	    !ext_hdrs[SADB_EXT_KEY_AUTH-1])
  		return ERR_PTR(-EINVAL);
  	if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
  	    !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
  		return ERR_PTR(-EINVAL);
  
  	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
  	if (proto == 0)
  		return ERR_PTR(-EINVAL);
  
  	/* default error is no buffer space */
  	err = -ENOBUFS;
  
  	/* RFC2367:
  
     Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
     SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
     sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
     Therefore, the sadb_sa_state field of all submitted SAs MUST be
     SADB_SASTATE_MATURE and the kernel MUST return an error if this is
     not true.
  
  	   However, KAME setkey always uses SADB_SASTATE_LARVAL.
  	   Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
  	 */
  	if (sa->sadb_sa_auth > SADB_AALG_MAX ||
  	    (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
  	     sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
  	    sa->sadb_sa_encrypt > SADB_EALG_MAX)
  		return ERR_PTR(-EINVAL);
  	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
  	if (key != NULL &&
  	    sa->sadb_sa_auth != SADB_X_AALG_NULL &&
  	    ((key->sadb_key_bits+7) / 8 == 0 ||
  	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
  		return ERR_PTR(-EINVAL);
  	key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
  	if (key != NULL &&
  	    sa->sadb_sa_encrypt != SADB_EALG_NULL &&
  	    ((key->sadb_key_bits+7) / 8 == 0 ||
  	     (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
  		return ERR_PTR(-EINVAL);
  
  	x = xfrm_state_alloc(net);
  	if (x == NULL)
  		return ERR_PTR(-ENOBUFS);
  
  	x->id.proto = proto;
  	x->id.spi = sa->sadb_sa_spi;
  	x->props.replay_window = sa->sadb_sa_replay;
  	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
  		x->props.flags |= XFRM_STATE_NOECN;
  	if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
  		x->props.flags |= XFRM_STATE_DECAP_DSCP;
  	if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
  		x->props.flags |= XFRM_STATE_NOPMTUDISC;
  
  	lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
  	if (lifetime != NULL) {
  		x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
  		x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
  		x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
  		x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
  	}
  	lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
  	if (lifetime != NULL) {
  		x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
  		x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
  		x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
  		x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
  	}
  
  	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
  	if (sec_ctx != NULL) {
  		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
  
  		if (!uctx)
  			goto out;
  
  		err = security_xfrm_state_alloc(x, uctx);
  		kfree(uctx);
  
  		if (err)
  			goto out;
  	}
  
  	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
  	if (sa->sadb_sa_auth) {
  		int keysize = 0;
  		struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
  		if (!a || !a->pfkey_supported) {
  			err = -ENOSYS;
  			goto out;
  		}
  		if (key)
  			keysize = (key->sadb_key_bits + 7) / 8;
  		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
  		if (!x->aalg)
  			goto out;
  		strcpy(x->aalg->alg_name, a->name);
  		x->aalg->alg_key_len = 0;
  		if (key) {
  			x->aalg->alg_key_len = key->sadb_key_bits;
  			memcpy(x->aalg->alg_key, key+1, keysize);
  		}
  		x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
  		x->props.aalgo = sa->sadb_sa_auth;
  		/* x->algo.flags = sa->sadb_sa_flags; */
  	}
  	if (sa->sadb_sa_encrypt) {
  		if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
  			struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
  			if (!a || !a->pfkey_supported) {
  				err = -ENOSYS;
  				goto out;
  			}
  			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
  			if (!x->calg)
  				goto out;
  			strcpy(x->calg->alg_name, a->name);
  			x->props.calgo = sa->sadb_sa_encrypt;
  		} else {
  			int keysize = 0;
  			struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
  			if (!a || !a->pfkey_supported) {
  				err = -ENOSYS;
  				goto out;
  			}
  			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
  			if (key)
  				keysize = (key->sadb_key_bits + 7) / 8;
  			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
  			if (!x->ealg)
  				goto out;
  			strcpy(x->ealg->alg_name, a->name);
  			x->ealg->alg_key_len = 0;
  			if (key) {
  				x->ealg->alg_key_len = key->sadb_key_bits;
  				memcpy(x->ealg->alg_key, key+1, keysize);
  			}
  			x->props.ealgo = sa->sadb_sa_encrypt;
  		}
  	}
  	/* x->algo.flags = sa->sadb_sa_flags; */
  
  	x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  						    &x->props.saddr);
  	if (!x->props.family) {
  		err = -EAFNOSUPPORT;
  		goto out;
  	}
  	pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
  				  &x->id.daddr);
  
  	if (ext_hdrs[SADB_X_EXT_SA2-1]) {
  		const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
  		int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
  		if (mode < 0) {
  			err = -EINVAL;
  			goto out;
  		}
  		x->props.mode = mode;
  		x->props.reqid = sa2->sadb_x_sa2_reqid;
  	}
  
  	if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
  		const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
  
  		/* Nobody uses this, but we try. */
  		x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
  		x->sel.prefixlen_s = addr->sadb_address_prefixlen;
  	}
  
  	if (!x->sel.family)
  		x->sel.family = x->props.family;
  
  	if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
  		const struct sadb_x_nat_t_type* n_type;
  		struct xfrm_encap_tmpl *natt;
  
  		x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
  		if (!x->encap)
  			goto out;
  
  		natt = x->encap;
  		n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
  		natt->encap_type = n_type->sadb_x_nat_t_type_type;
  
  		if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
  			const struct sadb_x_nat_t_port *n_port =
  				ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
  			natt->encap_sport = n_port->sadb_x_nat_t_port_port;
  		}
  		if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
  			const struct sadb_x_nat_t_port *n_port =
  				ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
  			natt->encap_dport = n_port->sadb_x_nat_t_port_port;
  		}
  		memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
  	}
  
  	err = xfrm_init_state(x);
  	if (err)
  		goto out;
  
  	x->km.seq = hdr->sadb_msg_seq;
  	return x;
  
  out:
  	x->km.state = XFRM_STATE_DEAD;
  	xfrm_state_put(x);
  	return ERR_PTR(err);
  }
  
  static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	return -EOPNOTSUPP;
  }
  
  static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	struct sk_buff *resp_skb;
  	struct sadb_x_sa2 *sa2;
  	struct sadb_address *saddr, *daddr;
  	struct sadb_msg *out_hdr;
  	struct sadb_spirange *range;
  	struct xfrm_state *x = NULL;
  	int mode;
  	int err;
  	u32 min_spi, max_spi;
  	u32 reqid;
  	u8 proto;
  	unsigned short family;
  	xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
  
  	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
  		return -EINVAL;
  
  	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
  	if (proto == 0)
  		return -EINVAL;
  
  	if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
  		mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
  		if (mode < 0)
  			return -EINVAL;
  		reqid = sa2->sadb_x_sa2_reqid;
  	} else {
  		mode = 0;
  		reqid = 0;
  	}
  
  	saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
  	daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
  
  	family = ((struct sockaddr *)(saddr + 1))->sa_family;
  	switch (family) {
  	case AF_INET:
  		xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
  		xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
  		break;
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
  		xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
  		break;
  #endif
  	}
  
  	if (hdr->sadb_msg_seq) {
  		x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
  		if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
  			xfrm_state_put(x);
  			x = NULL;
  		}
  	}
  
  	if (!x)
  		x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
  
  	if (x == NULL)
  		return -ENOENT;
  
  	min_spi = 0x100;
  	max_spi = 0x0fffffff;
  
  	range = ext_hdrs[SADB_EXT_SPIRANGE-1];
  	if (range) {
  		min_spi = range->sadb_spirange_min;
  		max_spi = range->sadb_spirange_max;
  	}
  
  	err = xfrm_alloc_spi(x, min_spi, max_spi);
  	resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
  
  	if (IS_ERR(resp_skb)) {
  		xfrm_state_put(x);
  		return  PTR_ERR(resp_skb);
  	}
  
  	out_hdr = (struct sadb_msg *) resp_skb->data;
  	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
  	out_hdr->sadb_msg_type = SADB_GETSPI;
  	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_reserved = 0;
  	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
  	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
  
  	xfrm_state_put(x);
  
  	pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
  
  	return 0;
  }
  
  static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	struct xfrm_state *x;
  
  	if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
  		return -EOPNOTSUPP;
  
  	if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
  		return 0;
  
  	x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
  	if (x == NULL)
  		return 0;
  
  	spin_lock_bh(&x->lock);
  	if (x->km.state == XFRM_STATE_ACQ) {
  		x->km.state = XFRM_STATE_ERROR;
  		wake_up(&net->xfrm.km_waitq);
  	}
  	spin_unlock_bh(&x->lock);
  	xfrm_state_put(x);
  	return 0;
  }
  
  static inline int event2poltype(int event)
  {
  	switch (event) {
  	case XFRM_MSG_DELPOLICY:
  		return SADB_X_SPDDELETE;
  	case XFRM_MSG_NEWPOLICY:
  		return SADB_X_SPDADD;
  	case XFRM_MSG_UPDPOLICY:
  		return SADB_X_SPDUPDATE;
  	case XFRM_MSG_POLEXPIRE:
  	//	return SADB_X_SPDEXPIRE;
  	default:
  		pr_err("pfkey: Unknown policy event %d\n", event);
  		break;
  	}
  
  	return 0;
  }
  
  static inline int event2keytype(int event)
  {
  	switch (event) {
  	case XFRM_MSG_DELSA:
  		return SADB_DELETE;
  	case XFRM_MSG_NEWSA:
  		return SADB_ADD;
  	case XFRM_MSG_UPDSA:
  		return SADB_UPDATE;
  	case XFRM_MSG_EXPIRE:
  		return SADB_EXPIRE;
  	default:
  		pr_err("pfkey: Unknown SA event %d\n", event);
  		break;
  	}
  
  	return 0;
  }
  
  /* ADD/UPD/DEL */
  static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  
  	skb = pfkey_xfrm_state2msg(x);
  
  	if (IS_ERR(skb))
  		return PTR_ERR(skb);
  
  	hdr = (struct sadb_msg *) skb->data;
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_type = event2keytype(c->event);
  	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
  	hdr->sadb_msg_errno = 0;
  	hdr->sadb_msg_reserved = 0;
  	hdr->sadb_msg_seq = c->seq;
  	hdr->sadb_msg_pid = c->portid;
  
  	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
  
  	return 0;
  }
  
  static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	struct xfrm_state *x;
  	int err;
  	struct km_event c;
  
  	x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
  	if (IS_ERR(x))
  		return PTR_ERR(x);
  
  	xfrm_state_hold(x);
  	if (hdr->sadb_msg_type == SADB_ADD)
  		err = xfrm_state_add(x);
  	else
  		err = xfrm_state_update(x);
  
  	xfrm_audit_state_add(x, err ? 0 : 1,
  			     audit_get_loginuid(current),
  			     audit_get_sessionid(current), 0);
  
  	if (err < 0) {
  		x->km.state = XFRM_STATE_DEAD;
  		__xfrm_state_put(x);
  		goto out;
  	}
  
  	if (hdr->sadb_msg_type == SADB_ADD)
  		c.event = XFRM_MSG_NEWSA;
  	else
  		c.event = XFRM_MSG_UPDSA;
  	c.seq = hdr->sadb_msg_seq;
  	c.portid = hdr->sadb_msg_pid;
  	km_state_notify(x, &c);
  out:
  	xfrm_state_put(x);
  	return err;
  }
  
  static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	struct xfrm_state *x;
  	struct km_event c;
  	int err;
  
  	if (!ext_hdrs[SADB_EXT_SA-1] ||
  	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
  		return -EINVAL;
  
  	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
  	if (x == NULL)
  		return -ESRCH;
  
  	if ((err = security_xfrm_state_delete(x)))
  		goto out;
  
  	if (xfrm_state_kern(x)) {
  		err = -EPERM;
  		goto out;
  	}
  
  	err = xfrm_state_delete(x);
  
  	if (err < 0)
  		goto out;
  
  	c.seq = hdr->sadb_msg_seq;
  	c.portid = hdr->sadb_msg_pid;
  	c.event = XFRM_MSG_DELSA;
  	km_state_notify(x, &c);
  out:
  	xfrm_audit_state_delete(x, err ? 0 : 1,
  				audit_get_loginuid(current),
  				audit_get_sessionid(current), 0);
  	xfrm_state_put(x);
  
  	return err;
  }
  
  static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	__u8 proto;
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  	struct xfrm_state *x;
  
  	if (!ext_hdrs[SADB_EXT_SA-1] ||
  	    !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
  		return -EINVAL;
  
  	x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
  	if (x == NULL)
  		return -ESRCH;
  
  	out_skb = pfkey_xfrm_state2msg(x);
  	proto = x->id.proto;
  	xfrm_state_put(x);
  	if (IS_ERR(out_skb))
  		return  PTR_ERR(out_skb);
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
  	out_hdr->sadb_msg_type = SADB_GET;
  	out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_reserved = 0;
  	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
  	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
  	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
  
  	return 0;
  }
  
  static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
  					      gfp_t allocation)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  	int len, auth_len, enc_len, i;
  
  	auth_len = xfrm_count_pfkey_auth_supported();
  	if (auth_len) {
  		auth_len *= sizeof(struct sadb_alg);
  		auth_len += sizeof(struct sadb_supported);
  	}
  
  	enc_len = xfrm_count_pfkey_enc_supported();
  	if (enc_len) {
  		enc_len *= sizeof(struct sadb_alg);
  		enc_len += sizeof(struct sadb_supported);
  	}
  
  	len = enc_len + auth_len + sizeof(struct sadb_msg);
  
  	skb = alloc_skb(len + 16, allocation);
  	if (!skb)
  		goto out_put_algs;
  
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
  	pfkey_hdr_dup(hdr, orig);
  	hdr->sadb_msg_errno = 0;
  	hdr->sadb_msg_len = len / sizeof(uint64_t);
  
  	if (auth_len) {
  		struct sadb_supported *sp;
  		struct sadb_alg *ap;
  
  		sp = (struct sadb_supported *) skb_put(skb, auth_len);
  		ap = (struct sadb_alg *) (sp + 1);
  
  		sp->sadb_supported_len = auth_len / sizeof(uint64_t);
  		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
  
  		for (i = 0; ; i++) {
  			struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
  			if (!aalg)
  				break;
  			if (!aalg->pfkey_supported)
  				continue;
  			if (aalg->available)
  				*ap++ = aalg->desc;
  		}
  	}
  
  	if (enc_len) {
  		struct sadb_supported *sp;
  		struct sadb_alg *ap;
  
  		sp = (struct sadb_supported *) skb_put(skb, enc_len);
  		ap = (struct sadb_alg *) (sp + 1);
  
  		sp->sadb_supported_len = enc_len / sizeof(uint64_t);
  		sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
  
  		for (i = 0; ; i++) {
  			struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
  			if (!ealg)
  				break;
  			if (!ealg->pfkey_supported)
  				continue;
  			if (ealg->available)
  				*ap++ = ealg->desc;
  		}
  	}
  
  out_put_algs:
  	return skb;
  }
  
  static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct pfkey_sock *pfk = pfkey_sk(sk);
  	struct sk_buff *supp_skb;
  
  	if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
  		return -EINVAL;
  
  	if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
  		if (pfk->registered&(1<<hdr->sadb_msg_satype))
  			return -EEXIST;
  		pfk->registered |= (1<<hdr->sadb_msg_satype);
  	}
  
  	xfrm_probe_algs();
  
  	supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
  	if (!supp_skb) {
  		if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
  			pfk->registered &= ~(1<<hdr->sadb_msg_satype);
  
  		return -ENOBUFS;
  	}
  
  	pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
  
  	return 0;
  }
  
  static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  
  	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
  	if (!skb)
  		return -ENOBUFS;
  
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	memcpy(hdr, ihdr, sizeof(struct sadb_msg));
  	hdr->sadb_msg_errno = (uint8_t) 0;
  	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
  
  	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
  }
  
  static int key_notify_sa_flush(const struct km_event *c)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  
  	skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
  	if (!skb)
  		return -ENOBUFS;
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
  	hdr->sadb_msg_type = SADB_FLUSH;
  	hdr->sadb_msg_seq = c->seq;
  	hdr->sadb_msg_pid = c->portid;
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_errno = (uint8_t) 0;
  	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
  	hdr->sadb_msg_reserved = 0;
  
  	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
  
  	return 0;
  }
  
  static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	unsigned int proto;
  	struct km_event c;
  	struct xfrm_audit audit_info;
  	int err, err2;
  
  	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
  	if (proto == 0)
  		return -EINVAL;
  
  	audit_info.loginuid = audit_get_loginuid(current);
  	audit_info.sessionid = audit_get_sessionid(current);
  	audit_info.secid = 0;
  	err = xfrm_state_flush(net, proto, &audit_info);
  	err2 = unicast_flush_resp(sk, hdr);
  	if (err || err2) {
  		if (err == -ESRCH) /* empty table - go quietly */
  			err = 0;
  		return err ? err : err2;
  	}
  
  	c.data.proto = proto;
  	c.seq = hdr->sadb_msg_seq;
  	c.portid = hdr->sadb_msg_pid;
  	c.event = XFRM_MSG_FLUSHSA;
  	c.net = net;
  	km_state_notify(NULL, &c);
  
  	return 0;
  }
  
  static int dump_sa(struct xfrm_state *x, int count, void *ptr)
  {
  	struct pfkey_sock *pfk = ptr;
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  
  	if (!pfkey_can_dump(&pfk->sk))
  		return -ENOBUFS;
  
  	out_skb = pfkey_xfrm_state2msg(x);
  	if (IS_ERR(out_skb))
  		return PTR_ERR(out_skb);
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = pfk->dump.msg_version;
  	out_hdr->sadb_msg_type = SADB_DUMP;
  	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_reserved = 0;
  	out_hdr->sadb_msg_seq = count + 1;
  	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
  
  	if (pfk->dump.skb)
  		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
  				&pfk->sk, sock_net(&pfk->sk));
  	pfk->dump.skb = out_skb;
  
  	return 0;
  }
  
  static int pfkey_dump_sa(struct pfkey_sock *pfk)
  {
  	struct net *net = sock_net(&pfk->sk);
  	return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
  }
  
  static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
  {
  	xfrm_state_walk_done(&pfk->dump.u.state);
  }
  
  static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	u8 proto;
  	struct pfkey_sock *pfk = pfkey_sk(sk);
  
  	if (pfk->dump.dump != NULL)
  		return -EBUSY;
  
  	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
  	if (proto == 0)
  		return -EINVAL;
  
  	pfk->dump.msg_version = hdr->sadb_msg_version;
  	pfk->dump.msg_portid = hdr->sadb_msg_pid;
  	pfk->dump.dump = pfkey_dump_sa;
  	pfk->dump.done = pfkey_dump_sa_done;
  	xfrm_state_walk_init(&pfk->dump.u.state, proto);
  
  	return pfkey_do_dump(pfk);
  }
  
  static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct pfkey_sock *pfk = pfkey_sk(sk);
  	int satype = hdr->sadb_msg_satype;
  	bool reset_errno = false;
  
  	if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
  		reset_errno = true;
  		if (satype != 0 && satype != 1)
  			return -EINVAL;
  		pfk->promisc = satype;
  	}
  	if (reset_errno && skb_cloned(skb))
  		skb = skb_copy(skb, GFP_KERNEL);
  	else
  		skb = skb_clone(skb, GFP_KERNEL);
  
  	if (reset_errno && skb) {
  		struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
  		new_hdr->sadb_msg_errno = 0;
  	}
  
  	pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
  	return 0;
  }
  
  static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
  {
  	int i;
  	u32 reqid = *(u32*)ptr;
  
  	for (i=0; i<xp->xfrm_nr; i++) {
  		if (xp->xfrm_vec[i].reqid == reqid)
  			return -EEXIST;
  	}
  	return 0;
  }
  
  static u32 gen_reqid(struct net *net)
  {
  	struct xfrm_policy_walk walk;
  	u32 start;
  	int rc;
  	static u32 reqid = IPSEC_MANUAL_REQID_MAX;
  
  	start = reqid;
  	do {
  		++reqid;
  		if (reqid == 0)
  			reqid = IPSEC_MANUAL_REQID_MAX+1;
  		xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
  		rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
  		xfrm_policy_walk_done(&walk);
  		if (rc != -EEXIST)
  			return reqid;
  	} while (reqid != start);
  	return 0;
  }
  
  static int
  parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
  {
  	struct net *net = xp_net(xp);
  	struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
  	int mode;
  
  	if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
  		return -ELOOP;
  
  	if (rq->sadb_x_ipsecrequest_mode == 0)
  		return -EINVAL;
  
  	t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
  	if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
  		return -EINVAL;
  	t->mode = mode;
  	if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
  		t->optional = 1;
  	else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
  		t->reqid = rq->sadb_x_ipsecrequest_reqid;
  		if (t->reqid > IPSEC_MANUAL_REQID_MAX)
  			t->reqid = 0;
  		if (!t->reqid && !(t->reqid = gen_reqid(net)))
  			return -ENOBUFS;
  	}
  
  	/* addresses present only in tunnel mode */
  	if (t->mode == XFRM_MODE_TUNNEL) {
  		u8 *sa = (u8 *) (rq + 1);
  		int family, socklen;
  
  		family = pfkey_sockaddr_extract((struct sockaddr *)sa,
  						&t->saddr);
  		if (!family)
  			return -EINVAL;
  
  		socklen = pfkey_sockaddr_len(family);
  		if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
  					   &t->id.daddr) != family)
  			return -EINVAL;
  		t->encap_family = family;
  	} else
  		t->encap_family = xp->family;
  
  	/* No way to set this via kame pfkey */
  	t->allalgs = 1;
  	xp->xfrm_nr++;
  	return 0;
  }
  
  static int
  parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
  {
  	int err;
  	int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
  	struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
  
  	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
  		return -EINVAL;
  
  	while (len >= sizeof(struct sadb_x_ipsecrequest)) {
  		if ((err = parse_ipsecrequest(xp, rq)) < 0)
  			return err;
  		len -= rq->sadb_x_ipsecrequest_len;
  		rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
  	}
  	return 0;
  }
  
  static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
  {
    struct xfrm_sec_ctx *xfrm_ctx = xp->security;
  
  	if (xfrm_ctx) {
  		int len = sizeof(struct sadb_x_sec_ctx);
  		len += xfrm_ctx->ctx_len;
  		return PFKEY_ALIGN8(len);
  	}
  	return 0;
  }
  
  static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
  {
  	const struct xfrm_tmpl *t;
  	int sockaddr_size = pfkey_sockaddr_size(xp->family);
  	int socklen = 0;
  	int i;
  
  	for (i=0; i<xp->xfrm_nr; i++) {
  		t = xp->xfrm_vec + i;
  		socklen += pfkey_sockaddr_len(t->encap_family);
  	}
  
  	return sizeof(struct sadb_msg) +
  		(sizeof(struct sadb_lifetime) * 3) +
  		(sizeof(struct sadb_address) * 2) +
  		(sockaddr_size * 2) +
  		sizeof(struct sadb_x_policy) +
  		(xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
  		(socklen * 2) +
  		pfkey_xfrm_policy2sec_ctx_size(xp);
  }
  
  static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
  {
  	struct sk_buff *skb;
  	int size;
  
  	size = pfkey_xfrm_policy2msg_size(xp);
  
  	skb =  alloc_skb(size + 16, GFP_ATOMIC);
  	if (skb == NULL)
  		return ERR_PTR(-ENOBUFS);
  
  	return skb;
  }
  
  static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
  {
  	struct sadb_msg *hdr;
  	struct sadb_address *addr;
  	struct sadb_lifetime *lifetime;
  	struct sadb_x_policy *pol;
  	struct sadb_x_sec_ctx *sec_ctx;
  	struct xfrm_sec_ctx *xfrm_ctx;
  	int i;
  	int size;
  	int sockaddr_size = pfkey_sockaddr_size(xp->family);
  	int socklen = pfkey_sockaddr_len(xp->family);
  
  	size = pfkey_xfrm_policy2msg_size(xp);
  
  	/* call should fill header later */
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	memset(hdr, 0, size);	/* XXX do we need this ? */
  
  	/* src address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
  	addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
  	addr->sadb_address_reserved = 0;
  	if (!pfkey_sockaddr_fill(&xp->selector.saddr,
  				 xp->selector.sport,
  				 (struct sockaddr *) (addr + 1),
  				 xp->family))
  		BUG();
  
  	/* dst address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  	addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
  	addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
  	addr->sadb_address_reserved = 0;
  
  	pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
  			    (struct sockaddr *) (addr + 1),
  			    xp->family);
  
  	/* hard time */
  	lifetime = (struct sadb_lifetime *)  skb_put(skb,
  						     sizeof(struct sadb_lifetime));
  	lifetime->sadb_lifetime_len =
  		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
  	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
  	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
  	lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
  	lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
  	/* soft time */
  	lifetime = (struct sadb_lifetime *)  skb_put(skb,
  						     sizeof(struct sadb_lifetime));
  	lifetime->sadb_lifetime_len =
  		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
  	lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
  	lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
  	lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
  	lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
  	/* current time */
  	lifetime = (struct sadb_lifetime *)  skb_put(skb,
  						     sizeof(struct sadb_lifetime));
  	lifetime->sadb_lifetime_len =
  		sizeof(struct sadb_lifetime)/sizeof(uint64_t);
  	lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
  	lifetime->sadb_lifetime_allocations = xp->curlft.packets;
  	lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
  	lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
  	lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
  
  	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
  	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
  	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
  	pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
  	if (xp->action == XFRM_POLICY_ALLOW) {
  		if (xp->xfrm_nr)
  			pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
  		else
  			pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
  	}
  	pol->sadb_x_policy_dir = dir+1;
  	pol->sadb_x_policy_reserved = 0;
  	pol->sadb_x_policy_id = xp->index;
  	pol->sadb_x_policy_priority = xp->priority;
  
  	for (i=0; i<xp->xfrm_nr; i++) {
  		const struct xfrm_tmpl *t = xp->xfrm_vec + i;
  		struct sadb_x_ipsecrequest *rq;
  		int req_size;
  		int mode;
  
  		req_size = sizeof(struct sadb_x_ipsecrequest);
  		if (t->mode == XFRM_MODE_TUNNEL) {
  			socklen = pfkey_sockaddr_len(t->encap_family);
  			req_size += socklen * 2;
  		} else {
  			size -= 2*socklen;
  		}
  		rq = (void*)skb_put(skb, req_size);
  		pol->sadb_x_policy_len += req_size/8;
  		memset(rq, 0, sizeof(*rq));
  		rq->sadb_x_ipsecrequest_len = req_size;
  		rq->sadb_x_ipsecrequest_proto = t->id.proto;
  		if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
  			return -EINVAL;
  		rq->sadb_x_ipsecrequest_mode = mode;
  		rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
  		if (t->reqid)
  			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
  		if (t->optional)
  			rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
  		rq->sadb_x_ipsecrequest_reqid = t->reqid;
  
  		if (t->mode == XFRM_MODE_TUNNEL) {
  			u8 *sa = (void *)(rq + 1);
  			pfkey_sockaddr_fill(&t->saddr, 0,
  					    (struct sockaddr *)sa,
  					    t->encap_family);
  			pfkey_sockaddr_fill(&t->id.daddr, 0,
  					    (struct sockaddr *) (sa + socklen),
  					    t->encap_family);
  		}
  	}
  
  	/* security context */
  	if ((xfrm_ctx = xp->security)) {
  		int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
  
  		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
  		sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
  		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
  		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
  		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
  		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
  		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
  		       xfrm_ctx->ctx_len);
  	}
  
  	hdr->sadb_msg_len = size / sizeof(uint64_t);
  	hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
  
  	return 0;
  }
  
  static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
  {
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  	int err;
  
  	out_skb = pfkey_xfrm_policy2msg_prep(xp);
  	if (IS_ERR(out_skb))
  		return PTR_ERR(out_skb);
  
  	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
  	if (err < 0)
  		return err;
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = PF_KEY_V2;
  
  	if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
  		out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
  	else
  		out_hdr->sadb_msg_type = event2poltype(c->event);
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_seq = c->seq;
  	out_hdr->sadb_msg_pid = c->portid;
  	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
  	return 0;
  
  }
  
  static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	int err = 0;
  	struct sadb_lifetime *lifetime;
  	struct sadb_address *sa;
  	struct sadb_x_policy *pol;
  	struct xfrm_policy *xp;
  	struct km_event c;
  	struct sadb_x_sec_ctx *sec_ctx;
  
  	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
  	    !ext_hdrs[SADB_X_EXT_POLICY-1])
  		return -EINVAL;
  
  	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
  	if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
  		return -EINVAL;
  	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
  		return -EINVAL;
  
  	xp = xfrm_policy_alloc(net, GFP_KERNEL);
  	if (xp == NULL)
  		return -ENOBUFS;
  
  	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
  		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
  	xp->priority = pol->sadb_x_policy_priority;
  
  	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
  	xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
  	if (!xp->family) {
  		err = -EINVAL;
  		goto out;
  	}
  	xp->selector.family = xp->family;
  	xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
  	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  	xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
  	if (xp->selector.sport)
  		xp->selector.sport_mask = htons(0xffff);
  
  	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
  	pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
  	xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
  
  	/* Amusing, we set this twice.  KAME apps appear to set same value
  	 * in both addresses.
  	 */
  	xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  
  	xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
  	if (xp->selector.dport)
  		xp->selector.dport_mask = htons(0xffff);
  
  	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
  	if (sec_ctx != NULL) {
  		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
  
  		if (!uctx) {
  			err = -ENOBUFS;
  			goto out;
  		}
  
  		err = security_xfrm_policy_alloc(&xp->security, uctx);
  		kfree(uctx);
  
  		if (err)
  			goto out;
  	}
  
  	xp->lft.soft_byte_limit = XFRM_INF;
  	xp->lft.hard_byte_limit = XFRM_INF;
  	xp->lft.soft_packet_limit = XFRM_INF;
  	xp->lft.hard_packet_limit = XFRM_INF;
  	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
  		xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
  		xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
  		xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
  		xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
  	}
  	if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
  		xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
  		xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
  		xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
  		xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
  	}
  	xp->xfrm_nr = 0;
  	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
  	    (err = parse_ipsecrequests(xp, pol)) < 0)
  		goto out;
  
  	err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
  				 hdr->sadb_msg_type != SADB_X_SPDUPDATE);
  
  	xfrm_audit_policy_add(xp, err ? 0 : 1,
  			      audit_get_loginuid(current),
  			      audit_get_sessionid(current), 0);
  
  	if (err)
  		goto out;
  
  	if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
  		c.event = XFRM_MSG_UPDPOLICY;
  	else
  		c.event = XFRM_MSG_NEWPOLICY;
  
  	c.seq = hdr->sadb_msg_seq;
  	c.portid = hdr->sadb_msg_pid;
  
  	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
  	xfrm_pol_put(xp);
  	return 0;
  
  out:
  	xp->walk.dead = 1;
  	xfrm_policy_destroy(xp);
  	return err;
  }
  
  static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	int err;
  	struct sadb_address *sa;
  	struct sadb_x_policy *pol;
  	struct xfrm_policy *xp;
  	struct xfrm_selector sel;
  	struct km_event c;
  	struct sadb_x_sec_ctx *sec_ctx;
  	struct xfrm_sec_ctx *pol_ctx = NULL;
  
  	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
  	    !ext_hdrs[SADB_X_EXT_POLICY-1])
  		return -EINVAL;
  
  	pol = ext_hdrs[SADB_X_EXT_POLICY-1];
  	if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
  		return -EINVAL;
  
  	memset(&sel, 0, sizeof(sel));
  
  	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
  	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
  	sel.prefixlen_s = sa->sadb_address_prefixlen;
  	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  	sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
  	if (sel.sport)
  		sel.sport_mask = htons(0xffff);
  
  	sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
  	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
  	sel.prefixlen_d = sa->sadb_address_prefixlen;
  	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  	sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
  	if (sel.dport)
  		sel.dport_mask = htons(0xffff);
  
  	sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
  	if (sec_ctx != NULL) {
  		struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
  
  		if (!uctx)
  			return -ENOMEM;
  
  		err = security_xfrm_policy_alloc(&pol_ctx, uctx);
  		kfree(uctx);
  		if (err)
  			return err;
  	}
  
  	xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
  				   pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
  				   1, &err);
  	security_xfrm_policy_free(pol_ctx);
  	if (xp == NULL)
  		return -ENOENT;
  
  	xfrm_audit_policy_delete(xp, err ? 0 : 1,
  				 audit_get_loginuid(current),
  				 audit_get_sessionid(current), 0);
  
  	if (err)
  		goto out;
  
  	c.seq = hdr->sadb_msg_seq;
  	c.portid = hdr->sadb_msg_pid;
  	c.data.byid = 0;
  	c.event = XFRM_MSG_DELPOLICY;
  	km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
  
  out:
  	xfrm_pol_put(xp);
  	if (err == 0)
  		xfrm_garbage_collect(net);
  	return err;
  }
  
  static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
  {
  	int err;
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  	err = 0;
  
  	out_skb = pfkey_xfrm_policy2msg_prep(xp);
  	if (IS_ERR(out_skb)) {
  		err =  PTR_ERR(out_skb);
  		goto out;
  	}
  	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
  	if (err < 0)
  		goto out;
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = hdr->sadb_msg_version;
  	out_hdr->sadb_msg_type = hdr->sadb_msg_type;
  	out_hdr->sadb_msg_satype = 0;
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
  	out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
  	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
  	err = 0;
  
  out:
  	return err;
  }
  
  #ifdef CONFIG_NET_KEY_MIGRATE
  static int pfkey_sockaddr_pair_size(sa_family_t family)
  {
  	return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
  }
  
  static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  			       xfrm_address_t *saddr, xfrm_address_t *daddr,
  			       u16 *family)
  {
  	int af, socklen;
  
  	if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
  		return -EINVAL;
  
  	af = pfkey_sockaddr_extract(sa, saddr);
  	if (!af)
  		return -EINVAL;
  
  	socklen = pfkey_sockaddr_len(af);
  	if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
  				   daddr) != af)
  		return -EINVAL;
  
  	*family = af;
  	return 0;
  }
  
  static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
  				    struct xfrm_migrate *m)
  {
  	int err;
  	struct sadb_x_ipsecrequest *rq2;
  	int mode;
  
  	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
  	    len < rq1->sadb_x_ipsecrequest_len)
  		return -EINVAL;
  
  	/* old endoints */
  	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
  				  rq1->sadb_x_ipsecrequest_len,
  				  &m->old_saddr, &m->old_daddr,
  				  &m->old_family);
  	if (err)
  		return err;
  
  	rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
  	len -= rq1->sadb_x_ipsecrequest_len;
  
  	if (len <= sizeof(struct sadb_x_ipsecrequest) ||
  	    len < rq2->sadb_x_ipsecrequest_len)
  		return -EINVAL;
  
  	/* new endpoints */
  	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
  				  rq2->sadb_x_ipsecrequest_len,
  				  &m->new_saddr, &m->new_daddr,
  				  &m->new_family);
  	if (err)
  		return err;
  
  	if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
  	    rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
  	    rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
  		return -EINVAL;
  
  	m->proto = rq1->sadb_x_ipsecrequest_proto;
  	if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
  		return -EINVAL;
  	m->mode = mode;
  	m->reqid = rq1->sadb_x_ipsecrequest_reqid;
  
  	return ((int)(rq1->sadb_x_ipsecrequest_len +
  		      rq2->sadb_x_ipsecrequest_len));
  }
  
  static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
  			 const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	int i, len, ret, err = -EINVAL;
  	u8 dir;
  	struct sadb_address *sa;
  	struct sadb_x_kmaddress *kma;
  	struct sadb_x_policy *pol;
  	struct sadb_x_ipsecrequest *rq;
  	struct xfrm_selector sel;
  	struct xfrm_migrate m[XFRM_MAX_DEPTH];
  	struct xfrm_kmaddress k;
  
  	if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
  				     ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
  	    !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
  	pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
  
  	if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	if (kma) {
  		/* convert sadb_x_kmaddress to xfrm_kmaddress */
  		k.reserved = kma->sadb_x_kmaddress_reserved;
  		ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
  					  8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
  					  &k.local, &k.remote, &k.family);
  		if (ret < 0) {
  			err = ret;
  			goto out;
  		}
  	}
  
  	dir = pol->sadb_x_policy_dir - 1;
  	memset(&sel, 0, sizeof(sel));
  
  	/* set source address info of selector */
  	sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
  	sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
  	sel.prefixlen_s = sa->sadb_address_prefixlen;
  	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  	sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
  	if (sel.sport)
  		sel.sport_mask = htons(0xffff);
  
  	/* set destination address info of selector */
  	sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
  	pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
  	sel.prefixlen_d = sa->sadb_address_prefixlen;
  	sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
  	sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
  	if (sel.dport)
  		sel.dport_mask = htons(0xffff);
  
  	rq = (struct sadb_x_ipsecrequest *)(pol + 1);
  
  	/* extract ipsecrequests */
  	i = 0;
  	len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
  
  	while (len > 0 && i < XFRM_MAX_DEPTH) {
  		ret = ipsecrequests_to_migrate(rq, len, &m[i]);
  		if (ret < 0) {
  			err = ret;
  			goto out;
  		} else {
  			rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
  			len -= ret;
  			i++;
  		}
  	}
  
  	if (!i || len > 0) {
  		err = -EINVAL;
  		goto out;
  	}
  
  	return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
  			    kma ? &k : NULL);
  
   out:
  	return err;
  }
  #else
  static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
  			 const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	return -ENOPROTOOPT;
  }
  #endif
  
  
  static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	unsigned int dir;
  	int err = 0, delete;
  	struct sadb_x_policy *pol;
  	struct xfrm_policy *xp;
  	struct km_event c;
  
  	if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
  		return -EINVAL;
  
  	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
  	if (dir >= XFRM_POLICY_MAX)
  		return -EINVAL;
  
  	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
  	xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
  			      dir, pol->sadb_x_policy_id, delete, &err);
  	if (xp == NULL)
  		return -ENOENT;
  
  	if (delete) {
  		xfrm_audit_policy_delete(xp, err ? 0 : 1,
  				audit_get_loginuid(current),
  				audit_get_sessionid(current), 0);
  
  		if (err)
  			goto out;
  		c.seq = hdr->sadb_msg_seq;
  		c.portid = hdr->sadb_msg_pid;
  		c.data.byid = 1;
  		c.event = XFRM_MSG_DELPOLICY;
  		km_policy_notify(xp, dir, &c);
  	} else {
  		err = key_pol_get_resp(sk, xp, hdr, dir);
  	}
  
  out:
  	xfrm_pol_put(xp);
  	if (delete && err == 0)
  		xfrm_garbage_collect(net);
  	return err;
  }
  
  static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
  {
  	struct pfkey_sock *pfk = ptr;
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  	int err;
  
  	if (!pfkey_can_dump(&pfk->sk))
  		return -ENOBUFS;
  
  	out_skb = pfkey_xfrm_policy2msg_prep(xp);
  	if (IS_ERR(out_skb))
  		return PTR_ERR(out_skb);
  
  	err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
  	if (err < 0)
  		return err;
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = pfk->dump.msg_version;
  	out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
  	out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_seq = count + 1;
  	out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
  
  	if (pfk->dump.skb)
  		pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
  				&pfk->sk, sock_net(&pfk->sk));
  	pfk->dump.skb = out_skb;
  
  	return 0;
  }
  
  static int pfkey_dump_sp(struct pfkey_sock *pfk)
  {
  	struct net *net = sock_net(&pfk->sk);
  	return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
  }
  
  static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
  {
  	xfrm_policy_walk_done(&pfk->dump.u.policy);
  }
  
  static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct pfkey_sock *pfk = pfkey_sk(sk);
  
  	if (pfk->dump.dump != NULL)
  		return -EBUSY;
  
  	pfk->dump.msg_version = hdr->sadb_msg_version;
  	pfk->dump.msg_portid = hdr->sadb_msg_pid;
  	pfk->dump.dump = pfkey_dump_sp;
  	pfk->dump.done = pfkey_dump_sp_done;
  	xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
  
  	return pfkey_do_dump(pfk);
  }
  
  static int key_notify_policy_flush(const struct km_event *c)
  {
  	struct sk_buff *skb_out;
  	struct sadb_msg *hdr;
  
  	skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
  	if (!skb_out)
  		return -ENOBUFS;
  	hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
  	hdr->sadb_msg_type = SADB_X_SPDFLUSH;
  	hdr->sadb_msg_seq = c->seq;
  	hdr->sadb_msg_pid = c->portid;
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_errno = (uint8_t) 0;
  	hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
  	hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
  	hdr->sadb_msg_reserved = 0;
  	pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
  	return 0;
  
  }
  
  static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
  {
  	struct net *net = sock_net(sk);
  	struct km_event c;
  	struct xfrm_audit audit_info;
  	int err, err2;
  
  	audit_info.loginuid = audit_get_loginuid(current);
  	audit_info.sessionid = audit_get_sessionid(current);
  	audit_info.secid = 0;
  	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
  	err2 = unicast_flush_resp(sk, hdr);
  	if (err || err2) {
  		if (err == -ESRCH) /* empty table - old silent behavior */
  			return 0;
  		return err;
  	}
  
  	c.data.type = XFRM_POLICY_TYPE_MAIN;
  	c.event = XFRM_MSG_FLUSHPOLICY;
  	c.portid = hdr->sadb_msg_pid;
  	c.seq = hdr->sadb_msg_seq;
  	c.net = net;
  	km_policy_notify(NULL, 0, &c);
  
  	return 0;
  }
  
  typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
  			     const struct sadb_msg *hdr, void * const *ext_hdrs);
  static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
  	[SADB_RESERVED]		= pfkey_reserved,
  	[SADB_GETSPI]		= pfkey_getspi,
  	[SADB_UPDATE]		= pfkey_add,
  	[SADB_ADD]		= pfkey_add,
  	[SADB_DELETE]		= pfkey_delete,
  	[SADB_GET]		= pfkey_get,
  	[SADB_ACQUIRE]		= pfkey_acquire,
  	[SADB_REGISTER]		= pfkey_register,
  	[SADB_EXPIRE]		= NULL,
  	[SADB_FLUSH]		= pfkey_flush,
  	[SADB_DUMP]		= pfkey_dump,
  	[SADB_X_PROMISC]	= pfkey_promisc,
  	[SADB_X_PCHANGE]	= NULL,
  	[SADB_X_SPDUPDATE]	= pfkey_spdadd,
  	[SADB_X_SPDADD]		= pfkey_spdadd,
  	[SADB_X_SPDDELETE]	= pfkey_spddelete,
  	[SADB_X_SPDGET]		= pfkey_spdget,
  	[SADB_X_SPDACQUIRE]	= NULL,
  	[SADB_X_SPDDUMP]	= pfkey_spddump,
  	[SADB_X_SPDFLUSH]	= pfkey_spdflush,
  	[SADB_X_SPDSETIDX]	= pfkey_spdadd,
  	[SADB_X_SPDDELETE2]	= pfkey_spdget,
  	[SADB_X_MIGRATE]	= pfkey_migrate,
  };
  
  static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
  {
  	void *ext_hdrs[SADB_EXT_MAX];
  	int err;
  
  	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
  			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
  
  	memset(ext_hdrs, 0, sizeof(ext_hdrs));
  	err = parse_exthdrs(skb, hdr, ext_hdrs);
  	if (!err) {
  		err = -EOPNOTSUPP;
  		if (pfkey_funcs[hdr->sadb_msg_type])
  			err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
  	}
  	return err;
  }
  
  static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
  {
  	struct sadb_msg *hdr = NULL;
  
  	if (skb->len < sizeof(*hdr)) {
  		*errp = -EMSGSIZE;
  	} else {
  		hdr = (struct sadb_msg *) skb->data;
  		if (hdr->sadb_msg_version != PF_KEY_V2 ||
  		    hdr->sadb_msg_reserved != 0 ||
  		    (hdr->sadb_msg_type <= SADB_RESERVED ||
  		     hdr->sadb_msg_type > SADB_MAX)) {
  			hdr = NULL;
  			*errp = -EINVAL;
  		} else if (hdr->sadb_msg_len != (skb->len /
  						 sizeof(uint64_t)) ||
  			   hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
  						sizeof(uint64_t))) {
  			hdr = NULL;
  			*errp = -EMSGSIZE;
  		} else {
  			*errp = 0;
  		}
  	}
  	return hdr;
  }
  
  static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
  				const struct xfrm_algo_desc *d)
  {
  	unsigned int id = d->desc.sadb_alg_id;
  
  	if (id >= sizeof(t->aalgos) * 8)
  		return 0;
  
  	return (t->aalgos >> id) & 1;
  }
  
  static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
  				const struct xfrm_algo_desc *d)
  {
  	unsigned int id = d->desc.sadb_alg_id;
  
  	if (id >= sizeof(t->ealgos) * 8)
  		return 0;
  
  	return (t->ealgos >> id) & 1;
  }
  
  static int count_ah_combs(const struct xfrm_tmpl *t)
  {
  	int i, sz = 0;
  
  	for (i = 0; ; i++) {
  		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
  		if (!aalg)
  			break;
  		if (!aalg->pfkey_supported)
  			continue;
  		if (aalg_tmpl_set(t, aalg) && aalg->available)
  			sz += sizeof(struct sadb_comb);
  	}
  	return sz + sizeof(struct sadb_prop);
  }
  
  static int count_esp_combs(const struct xfrm_tmpl *t)
  {
  	int i, k, sz = 0;
  
  	for (i = 0; ; i++) {
  		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
  		if (!ealg)
  			break;
  
  		if (!ealg->pfkey_supported)
  			continue;
  
  		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
  			continue;
  
  		for (k = 1; ; k++) {
  			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
  			if (!aalg)
  				break;
  
  			if (!aalg->pfkey_supported)
  				continue;
  
  			if (aalg_tmpl_set(t, aalg) && aalg->available)
  				sz += sizeof(struct sadb_comb);
  		}
  	}
  	return sz + sizeof(struct sadb_prop);
  }
  
  static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
  {
  	struct sadb_prop *p;
  	int i;
  
  	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
  	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
  	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
  	p->sadb_prop_replay = 32;
  	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
  
  	for (i = 0; ; i++) {
  		const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
  		if (!aalg)
  			break;
  
  		if (!aalg->pfkey_supported)
  			continue;
  
  		if (aalg_tmpl_set(t, aalg) && aalg->available) {
  			struct sadb_comb *c;
  			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
  			memset(c, 0, sizeof(*c));
  			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
  			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
  			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
  			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
  			c->sadb_comb_hard_addtime = 24*60*60;
  			c->sadb_comb_soft_addtime = 20*60*60;
  			c->sadb_comb_hard_usetime = 8*60*60;
  			c->sadb_comb_soft_usetime = 7*60*60;
  		}
  	}
  }
  
  static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
  {
  	struct sadb_prop *p;
  	int i, k;
  
  	p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
  	p->sadb_prop_len = sizeof(struct sadb_prop)/8;
  	p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
  	p->sadb_prop_replay = 32;
  	memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
  
  	for (i=0; ; i++) {
  		const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
  		if (!ealg)
  			break;
  
  		if (!ealg->pfkey_supported)
  			continue;
  
  		if (!(ealg_tmpl_set(t, ealg) && ealg->available))
  			continue;
  
  		for (k = 1; ; k++) {
  			struct sadb_comb *c;
  			const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
  			if (!aalg)
  				break;
  			if (!aalg->pfkey_supported)
  				continue;
  			if (!(aalg_tmpl_set(t, aalg) && aalg->available))
  				continue;
  			c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
  			memset(c, 0, sizeof(*c));
  			p->sadb_prop_len += sizeof(struct sadb_comb)/8;
  			c->sadb_comb_auth = aalg->desc.sadb_alg_id;
  			c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
  			c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
  			c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
  			c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
  			c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
  			c->sadb_comb_hard_addtime = 24*60*60;
  			c->sadb_comb_soft_addtime = 20*60*60;
  			c->sadb_comb_hard_usetime = 8*60*60;
  			c->sadb_comb_soft_usetime = 7*60*60;
  		}
  	}
  }
  
  static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
  {
  	return 0;
  }
  
  static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
  {
  	struct sk_buff *out_skb;
  	struct sadb_msg *out_hdr;
  	int hard;
  	int hsc;
  
  	hard = c->data.hard;
  	if (hard)
  		hsc = 2;
  	else
  		hsc = 1;
  
  	out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
  	if (IS_ERR(out_skb))
  		return PTR_ERR(out_skb);
  
  	out_hdr = (struct sadb_msg *) out_skb->data;
  	out_hdr->sadb_msg_version = PF_KEY_V2;
  	out_hdr->sadb_msg_type = SADB_EXPIRE;
  	out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
  	out_hdr->sadb_msg_errno = 0;
  	out_hdr->sadb_msg_reserved = 0;
  	out_hdr->sadb_msg_seq = 0;
  	out_hdr->sadb_msg_pid = 0;
  
  	pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
  	return 0;
  }
  
  static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
  {
  	struct net *net = x ? xs_net(x) : c->net;
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	if (atomic_read(&net_pfkey->socks_nr) == 0)
  		return 0;
  
  	switch (c->event) {
  	case XFRM_MSG_EXPIRE:
  		return key_notify_sa_expire(x, c);
  	case XFRM_MSG_DELSA:
  	case XFRM_MSG_NEWSA:
  	case XFRM_MSG_UPDSA:
  		return key_notify_sa(x, c);
  	case XFRM_MSG_FLUSHSA:
  		return key_notify_sa_flush(c);
  	case XFRM_MSG_NEWAE: /* not yet supported */
  		break;
  	default:
  		pr_err("pfkey: Unknown SA event %d\n", c->event);
  		break;
  	}
  
  	return 0;
  }
  
  static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
  {
  	if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
  		return 0;
  
  	switch (c->event) {
  	case XFRM_MSG_POLEXPIRE:
  		return key_notify_policy_expire(xp, c);
  	case XFRM_MSG_DELPOLICY:
  	case XFRM_MSG_NEWPOLICY:
  	case XFRM_MSG_UPDPOLICY:
  		return key_notify_policy(xp, dir, c);
  	case XFRM_MSG_FLUSHPOLICY:
  		if (c->data.type != XFRM_POLICY_TYPE_MAIN)
  			break;
  		return key_notify_policy_flush(c);
  	default:
  		pr_err("pfkey: Unknown policy event %d\n", c->event);
  		break;
  	}
  
  	return 0;
  }
  
  static u32 get_acqseq(void)
  {
  	u32 res;
  	static atomic_t acqseq;
  
  	do {
  		res = atomic_inc_return(&acqseq);
  	} while (!res);
  	return res;
  }
  
  static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  	struct sadb_address *addr;
  	struct sadb_x_policy *pol;
  	int sockaddr_size;
  	int size;
  	struct sadb_x_sec_ctx *sec_ctx;
  	struct xfrm_sec_ctx *xfrm_ctx;
  	int ctx_size = 0;
  
  	sockaddr_size = pfkey_sockaddr_size(x->props.family);
  	if (!sockaddr_size)
  		return -EINVAL;
  
  	size = sizeof(struct sadb_msg) +
  		(sizeof(struct sadb_address) * 2) +
  		(sockaddr_size * 2) +
  		sizeof(struct sadb_x_policy);
  
  	if (x->id.proto == IPPROTO_AH)
  		size += count_ah_combs(t);
  	else if (x->id.proto == IPPROTO_ESP)
  		size += count_esp_combs(t);
  
  	if ((xfrm_ctx = x->security)) {
  		ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
  		size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
  	}
  
  	skb =  alloc_skb(size + 16, GFP_ATOMIC);
  	if (skb == NULL)
  		return -ENOMEM;
  
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_type = SADB_ACQUIRE;
  	hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
  	hdr->sadb_msg_len = size / sizeof(uint64_t);
  	hdr->sadb_msg_errno = 0;
  	hdr->sadb_msg_reserved = 0;
  	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
  	hdr->sadb_msg_pid = 0;
  
  	/* src address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(&x->props.saddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	/* dst address */
  	addr = (struct sadb_address*) skb_put(skb,
  					      sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(&x->id.daddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
  	pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
  	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
  	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
  	pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
  	pol->sadb_x_policy_reserved = 0;
  	pol->sadb_x_policy_id = xp->index;
  	pol->sadb_x_policy_priority = xp->priority;
  
  	/* Set sadb_comb's. */
  	if (x->id.proto == IPPROTO_AH)
  		dump_ah_combs(skb, t);
  	else if (x->id.proto == IPPROTO_ESP)
  		dump_esp_combs(skb, t);
  
  	/* security context */
  	if (xfrm_ctx) {
  		sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
  				sizeof(struct sadb_x_sec_ctx) + ctx_size);
  		sec_ctx->sadb_x_sec_len =
  		  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
  		sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
  		sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
  		sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
  		sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
  		memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
  		       xfrm_ctx->ctx_len);
  	}
  
  	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
  }
  
  static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
  						u8 *data, int len, int *dir)
  {
  	struct net *net = sock_net(sk);
  	struct xfrm_policy *xp;
  	struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
  	struct sadb_x_sec_ctx *sec_ctx;
  
  	switch (sk->sk_family) {
  	case AF_INET:
  		if (opt != IP_IPSEC_POLICY) {
  			*dir = -EOPNOTSUPP;
  			return NULL;
  		}
  		break;
  #if IS_ENABLED(CONFIG_IPV6)
  	case AF_INET6:
  		if (opt != IPV6_IPSEC_POLICY) {
  			*dir = -EOPNOTSUPP;
  			return NULL;
  		}
  		break;
  #endif
  	default:
  		*dir = -EINVAL;
  		return NULL;
  	}
  
  	*dir = -EINVAL;
  
  	if (len < sizeof(struct sadb_x_policy) ||
  	    pol->sadb_x_policy_len*8 > len ||
  	    pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
  	    (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
  		return NULL;
  
  	xp = xfrm_policy_alloc(net, GFP_ATOMIC);
  	if (xp == NULL) {
  		*dir = -ENOBUFS;
  		return NULL;
  	}
  
  	xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
  		      XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
  
  	xp->lft.soft_byte_limit = XFRM_INF;
  	xp->lft.hard_byte_limit = XFRM_INF;
  	xp->lft.soft_packet_limit = XFRM_INF;
  	xp->lft.hard_packet_limit = XFRM_INF;
  	xp->family = sk->sk_family;
  
  	xp->xfrm_nr = 0;
  	if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
  	    (*dir = parse_ipsecrequests(xp, pol)) < 0)
  		goto out;
  
  	/* security context too */
  	if (len >= (pol->sadb_x_policy_len*8 +
  	    sizeof(struct sadb_x_sec_ctx))) {
  		char *p = (char *)pol;
  		struct xfrm_user_sec_ctx *uctx;
  
  		p += pol->sadb_x_policy_len*8;
  		sec_ctx = (struct sadb_x_sec_ctx *)p;
  		if (len < pol->sadb_x_policy_len*8 +
  		    sec_ctx->sadb_x_sec_len) {
  			*dir = -EINVAL;
  			goto out;
  		}
  		if ((*dir = verify_sec_ctx_len(p)))
  			goto out;
  		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
  		*dir = security_xfrm_policy_alloc(&xp->security, uctx);
  		kfree(uctx);
  
  		if (*dir)
  			goto out;
  	}
  
  	*dir = pol->sadb_x_policy_dir-1;
  	return xp;
  
  out:
  	xp->walk.dead = 1;
  	xfrm_policy_destroy(xp);
  	return NULL;
  }
  
  static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
  {
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  	struct sadb_sa *sa;
  	struct sadb_address *addr;
  	struct sadb_x_nat_t_port *n_port;
  	int sockaddr_size;
  	int size;
  	__u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
  	struct xfrm_encap_tmpl *natt = NULL;
  
  	sockaddr_size = pfkey_sockaddr_size(x->props.family);
  	if (!sockaddr_size)
  		return -EINVAL;
  
  	if (!satype)
  		return -EINVAL;
  
  	if (!x->encap)
  		return -EINVAL;
  
  	natt = x->encap;
  
  	/* Build an SADB_X_NAT_T_NEW_MAPPING message:
  	 *
  	 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
  	 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
  	 */
  
  	size = sizeof(struct sadb_msg) +
  		sizeof(struct sadb_sa) +
  		(sizeof(struct sadb_address) * 2) +
  		(sockaddr_size * 2) +
  		(sizeof(struct sadb_x_nat_t_port) * 2);
  
  	skb =  alloc_skb(size + 16, GFP_ATOMIC);
  	if (skb == NULL)
  		return -ENOMEM;
  
  	hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
  	hdr->sadb_msg_satype = satype;
  	hdr->sadb_msg_len = size / sizeof(uint64_t);
  	hdr->sadb_msg_errno = 0;
  	hdr->sadb_msg_reserved = 0;
  	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
  	hdr->sadb_msg_pid = 0;
  
  	/* SA */
  	sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
  	sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
  	sa->sadb_sa_exttype = SADB_EXT_SA;
  	sa->sadb_sa_spi = x->id.spi;
  	sa->sadb_sa_replay = 0;
  	sa->sadb_sa_state = 0;
  	sa->sadb_sa_auth = 0;
  	sa->sadb_sa_encrypt = 0;
  	sa->sadb_sa_flags = 0;
  
  	/* ADDRESS_SRC (old addr) */
  	addr = (struct sadb_address*)
  		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(&x->props.saddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	/* NAT_T_SPORT (old port) */
  	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
  	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
  	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
  	n_port->sadb_x_nat_t_port_port = natt->encap_sport;
  	n_port->sadb_x_nat_t_port_reserved = 0;
  
  	/* ADDRESS_DST (new addr) */
  	addr = (struct sadb_address*)
  		skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
  	addr->sadb_address_len =
  		(sizeof(struct sadb_address)+sockaddr_size)/
  			sizeof(uint64_t);
  	addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  	addr->sadb_address_proto = 0;
  	addr->sadb_address_reserved = 0;
  	addr->sadb_address_prefixlen =
  		pfkey_sockaddr_fill(ipaddr, 0,
  				    (struct sockaddr *) (addr + 1),
  				    x->props.family);
  	if (!addr->sadb_address_prefixlen)
  		BUG();
  
  	/* NAT_T_DPORT (new port) */
  	n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
  	n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
  	n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
  	n_port->sadb_x_nat_t_port_port = sport;
  	n_port->sadb_x_nat_t_port_reserved = 0;
  
  	return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
  }
  
  #ifdef CONFIG_NET_KEY_MIGRATE
  static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
  			    const struct xfrm_selector *sel)
  {
  	struct sadb_address *addr;
  	addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
  	addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
  	addr->sadb_address_exttype = type;
  	addr->sadb_address_proto = sel->proto;
  	addr->sadb_address_reserved = 0;
  
  	switch (type) {
  	case SADB_EXT_ADDRESS_SRC:
  		addr->sadb_address_prefixlen = sel->prefixlen_s;
  		pfkey_sockaddr_fill(&sel->saddr, 0,
  				    (struct sockaddr *)(addr + 1),
  				    sel->family);
  		break;
  	case SADB_EXT_ADDRESS_DST:
  		addr->sadb_address_prefixlen = sel->prefixlen_d;
  		pfkey_sockaddr_fill(&sel->daddr, 0,
  				    (struct sockaddr *)(addr + 1),
  				    sel->family);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  
  static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
  {
  	struct sadb_x_kmaddress *kma;
  	u8 *sa;
  	int family = k->family;
  	int socklen = pfkey_sockaddr_len(family);
  	int size_req;
  
  	size_req = (sizeof(struct sadb_x_kmaddress) +
  		    pfkey_sockaddr_pair_size(family));
  
  	kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
  	memset(kma, 0, size_req);
  	kma->sadb_x_kmaddress_len = size_req / 8;
  	kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
  	kma->sadb_x_kmaddress_reserved = k->reserved;
  
  	sa = (u8 *)(kma + 1);
  	if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
  	    !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
  		return -EINVAL;
  
  	return 0;
  }
  
  static int set_ipsecrequest(struct sk_buff *skb,
  			    uint8_t proto, uint8_t mode, int level,
  			    uint32_t reqid, uint8_t family,
  			    const xfrm_address_t *src, const xfrm_address_t *dst)
  {
  	struct sadb_x_ipsecrequest *rq;
  	u8 *sa;
  	int socklen = pfkey_sockaddr_len(family);
  	int size_req;
  
  	size_req = sizeof(struct sadb_x_ipsecrequest) +
  		   pfkey_sockaddr_pair_size(family);
  
  	rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
  	memset(rq, 0, size_req);
  	rq->sadb_x_ipsecrequest_len = size_req;
  	rq->sadb_x_ipsecrequest_proto = proto;
  	rq->sadb_x_ipsecrequest_mode = mode;
  	rq->sadb_x_ipsecrequest_level = level;
  	rq->sadb_x_ipsecrequest_reqid = reqid;
  
  	sa = (u8 *) (rq + 1);
  	if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
  	    !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
  		return -EINVAL;
  
  	return 0;
  }
  #endif
  
  #ifdef CONFIG_NET_KEY_MIGRATE
  static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
  			      const struct xfrm_migrate *m, int num_bundles,
  			      const struct xfrm_kmaddress *k)
  {
  	int i;
  	int sasize_sel;
  	int size = 0;
  	int size_pol = 0;
  	struct sk_buff *skb;
  	struct sadb_msg *hdr;
  	struct sadb_x_policy *pol;
  	const struct xfrm_migrate *mp;
  
  	if (type != XFRM_POLICY_TYPE_MAIN)
  		return 0;
  
  	if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
  		return -EINVAL;
  
  	if (k != NULL) {
  		/* addresses for KM */
  		size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
  				     pfkey_sockaddr_pair_size(k->family));
  	}
  
  	/* selector */
  	sasize_sel = pfkey_sockaddr_size(sel->family);
  	if (!sasize_sel)
  		return -EINVAL;
  	size += (sizeof(struct sadb_address) + sasize_sel) * 2;
  
  	/* policy info */
  	size_pol += sizeof(struct sadb_x_policy);
  
  	/* ipsecrequests */
  	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
  		/* old locator pair */
  		size_pol += sizeof(struct sadb_x_ipsecrequest) +
  			    pfkey_sockaddr_pair_size(mp->old_family);
  		/* new locator pair */
  		size_pol += sizeof(struct sadb_x_ipsecrequest) +
  			    pfkey_sockaddr_pair_size(mp->new_family);
  	}
  
  	size += sizeof(struct sadb_msg) + size_pol;
  
  	/* alloc buffer */
  	skb = alloc_skb(size, GFP_ATOMIC);
  	if (skb == NULL)
  		return -ENOMEM;
  
  	hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
  	hdr->sadb_msg_version = PF_KEY_V2;
  	hdr->sadb_msg_type = SADB_X_MIGRATE;
  	hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
  	hdr->sadb_msg_len = size / 8;
  	hdr->sadb_msg_errno = 0;
  	hdr->sadb_msg_reserved = 0;
  	hdr->sadb_msg_seq = 0;
  	hdr->sadb_msg_pid = 0;
  
  	/* Addresses to be used by KM for negotiation, if ext is available */
  	if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
  		goto err;
  
  	/* selector src */
  	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
  
  	/* selector dst */
  	set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
  
  	/* policy information */
  	pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
  	pol->sadb_x_policy_len = size_pol / 8;
  	pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
  	pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
  	pol->sadb_x_policy_dir = dir + 1;
  	pol->sadb_x_policy_reserved = 0;
  	pol->sadb_x_policy_id = 0;
  	pol->sadb_x_policy_priority = 0;
  
  	for (i = 0, mp = m; i < num_bundles; i++, mp++) {
  		/* old ipsecrequest */
  		int mode = pfkey_mode_from_xfrm(mp->mode);
  		if (mode < 0)
  			goto err;
  		if (set_ipsecrequest(skb, mp->proto, mode,
  				     (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
  				     mp->reqid, mp->old_family,
  				     &mp->old_saddr, &mp->old_daddr) < 0)
  			goto err;
  
  		/* new ipsecrequest */
  		if (set_ipsecrequest(skb, mp->proto, mode,
  				     (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
  				     mp->reqid, mp->new_family,
  				     &mp->new_saddr, &mp->new_daddr) < 0)
  			goto err;
  	}
  
  	/* broadcast migrate message to sockets */
  	pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
  
  	return 0;
  
  err:
  	kfree_skb(skb);
  	return -EINVAL;
  }
  #else
  static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
  			      const struct xfrm_migrate *m, int num_bundles,
  			      const struct xfrm_kmaddress *k)
  {
  	return -ENOPROTOOPT;
  }
  #endif
  
  static int pfkey_sendmsg(struct kiocb *kiocb,
  			 struct socket *sock, struct msghdr *msg, size_t len)
  {
  	struct sock *sk = sock->sk;
  	struct sk_buff *skb = NULL;
  	struct sadb_msg *hdr = NULL;
  	int err;
  
  	err = -EOPNOTSUPP;
  	if (msg->msg_flags & MSG_OOB)
  		goto out;
  
  	err = -EMSGSIZE;
  	if ((unsigned int)len > sk->sk_sndbuf - 32)
  		goto out;
  
  	err = -ENOBUFS;
  	skb = alloc_skb(len, GFP_KERNEL);
  	if (skb == NULL)
  		goto out;
  
  	err = -EFAULT;
  	if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
  		goto out;
  
  	hdr = pfkey_get_base_msg(skb, &err);
  	if (!hdr)
  		goto out;
  
  	mutex_lock(&xfrm_cfg_mutex);
  	err = pfkey_process(sk, skb, hdr);
  	mutex_unlock(&xfrm_cfg_mutex);
  
  out:
  	if (err && hdr && pfkey_error(hdr, err, sk) == 0)
  		err = 0;
  	kfree_skb(skb);
  
  	return err ? : len;
  }
  
  static int pfkey_recvmsg(struct kiocb *kiocb,
  			 struct socket *sock, struct msghdr *msg, size_t len,
  			 int flags)
  {
  	struct sock *sk = sock->sk;
  	struct pfkey_sock *pfk = pfkey_sk(sk);
  	struct sk_buff *skb;
  	int copied, err;
  
  	err = -EINVAL;
  	if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
  		goto out;
  
  	skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
  	if (skb == NULL)
  		goto out;
  
  	copied = skb->len;
  	if (copied > len) {
  		msg->msg_flags |= MSG_TRUNC;
  		copied = len;
  	}
  
  	skb_reset_transport_header(skb);
  	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
  	if (err)
  		goto out_free;
  
  	sock_recv_ts_and_drops(msg, sk, skb);
  
  	err = (flags & MSG_TRUNC) ? skb->len : copied;
  
  	if (pfk->dump.dump != NULL &&
  	    3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
  		pfkey_do_dump(pfk);
  
  out_free:
  	skb_free_datagram(sk, skb);
  out:
  	return err;
  }
  
  static const struct proto_ops pfkey_ops = {
  	.family		=	PF_KEY,
  	.owner		=	THIS_MODULE,
  	/* Operations that make no sense on pfkey sockets. */
  	.bind		=	sock_no_bind,
  	.connect	=	sock_no_connect,
  	.socketpair	=	sock_no_socketpair,
  	.accept		=	sock_no_accept,
  	.getname	=	sock_no_getname,
  	.ioctl		=	sock_no_ioctl,
  	.listen		=	sock_no_listen,
  	.shutdown	=	sock_no_shutdown,
  	.setsockopt	=	sock_no_setsockopt,
  	.getsockopt	=	sock_no_getsockopt,
  	.mmap		=	sock_no_mmap,
  	.sendpage	=	sock_no_sendpage,
  
  	/* Now the operations that really occur. */
  	.release	=	pfkey_release,
  	.poll		=	datagram_poll,
  	.sendmsg	=	pfkey_sendmsg,
  	.recvmsg	=	pfkey_recvmsg,
  };
  
  static const struct net_proto_family pfkey_family_ops = {
  	.family	=	PF_KEY,
  	.create	=	pfkey_create,
  	.owner	=	THIS_MODULE,
  };
  
  #ifdef CONFIG_PROC_FS
  static int pfkey_seq_show(struct seq_file *f, void *v)
  {
  	struct sock *s = sk_entry(v);
  
  	if (v == SEQ_START_TOKEN)
  		seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
  	else
  		seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
  			       s,
  			       atomic_read(&s->sk_refcnt),
  			       sk_rmem_alloc_get(s),
  			       sk_wmem_alloc_get(s),
  			       from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
  			       sock_i_ino(s)
  			       );
  	return 0;
  }
  
  static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
  	__acquires(rcu)
  {
  	struct net *net = seq_file_net(f);
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	rcu_read_lock();
  	return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
  }
  
  static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
  {
  	struct net *net = seq_file_net(f);
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
  }
  
  static void pfkey_seq_stop(struct seq_file *f, void *v)
  	__releases(rcu)
  {
  	rcu_read_unlock();
  }
  
  static const struct seq_operations pfkey_seq_ops = {
  	.start	= pfkey_seq_start,
  	.next	= pfkey_seq_next,
  	.stop	= pfkey_seq_stop,
  	.show	= pfkey_seq_show,
  };
  
  static int pfkey_seq_open(struct inode *inode, struct file *file)
  {
  	return seq_open_net(inode, file, &pfkey_seq_ops,
  			    sizeof(struct seq_net_private));
  }
  
  static const struct file_operations pfkey_proc_ops = {
  	.open	 = pfkey_seq_open,
  	.read	 = seq_read,
  	.llseek	 = seq_lseek,
  	.release = seq_release_net,
  };
  
  static int __net_init pfkey_init_proc(struct net *net)
  {
  	struct proc_dir_entry *e;
  
  	e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
  	if (e == NULL)
  		return -ENOMEM;
  
  	return 0;
  }
  
  static void __net_exit pfkey_exit_proc(struct net *net)
  {
  	remove_proc_entry("pfkey", net->proc_net);
  }
  #else
  static inline int pfkey_init_proc(struct net *net)
  {
  	return 0;
  }
  
  static inline void pfkey_exit_proc(struct net *net)
  {
  }
  #endif
  
  static struct xfrm_mgr pfkeyv2_mgr =
  {
  	.id		= "pfkeyv2",
  	.notify		= pfkey_send_notify,
  	.acquire	= pfkey_send_acquire,
  	.compile_policy	= pfkey_compile_policy,
  	.new_mapping	= pfkey_send_new_mapping,
  	.notify_policy	= pfkey_send_policy_notify,
  	.migrate	= pfkey_send_migrate,
  };
  
  static int __net_init pfkey_net_init(struct net *net)
  {
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  	int rv;
  
  	INIT_HLIST_HEAD(&net_pfkey->table);
  	atomic_set(&net_pfkey->socks_nr, 0);
  
  	rv = pfkey_init_proc(net);
  
  	return rv;
  }
  
  static void __net_exit pfkey_net_exit(struct net *net)
  {
  	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  
  	pfkey_exit_proc(net);
  	BUG_ON(!hlist_empty(&net_pfkey->table));
  }
  
  static struct pernet_operations pfkey_net_ops = {
  	.init = pfkey_net_init,
  	.exit = pfkey_net_exit,
  	.id   = &pfkey_net_id,
  	.size = sizeof(struct netns_pfkey),
  };
  
  static void __exit ipsec_pfkey_exit(void)
  {
  	xfrm_unregister_km(&pfkeyv2_mgr);
  	sock_unregister(PF_KEY);
  	unregister_pernet_subsys(&pfkey_net_ops);
  	proto_unregister(&key_proto);
  }
  
  static int __init ipsec_pfkey_init(void)
  {
  	int err = proto_register(&key_proto, 0);
  
  	if (err != 0)
  		goto out;
  
  	err = register_pernet_subsys(&pfkey_net_ops);
  	if (err != 0)
  		goto out_unregister_key_proto;
  	err = sock_register(&pfkey_family_ops);
  	if (err != 0)
  		goto out_unregister_pernet;
  	err = xfrm_register_km(&pfkeyv2_mgr);
  	if (err != 0)
  		goto out_sock_unregister;
  out:
  	return err;
  
  out_sock_unregister:
  	sock_unregister(PF_KEY);
  out_unregister_pernet:
  	unregister_pernet_subsys(&pfkey_net_ops);
  out_unregister_key_proto:
  	proto_unregister(&key_proto);
  	goto out;
  }
  
  module_init(ipsec_pfkey_init);
  module_exit(ipsec_pfkey_exit);
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_NETPROTO(PF_KEY);
  