net/key/af_key.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * net/key/af_key.c	An implementation of PF_KEYv2 sockets.
  *
  * 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 unsigned 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 const 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;
 	struct mutex dump_lock;
 };

 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
 			       xfrm_address_t *saddr, xfrm_address_t *daddr,
 			       u16 *family);

 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(refcount_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;
 	struct pfkey_sock *pfk;

 	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;

 	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 	if (sk == NULL)
 		return -ENOMEM;

 	pfk = pfkey_sk(sk);
 	mutex_init(&pfk->dump_lock);

 	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;
 }

 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, gfp_t allocation,
 			       struct sock *sk)
 {
 	int err = -ENOBUFS;

 	if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 		return err;

 	skb = skb_clone(skb, allocation);

 	if (skb) {
 		skb_set_owner_r(skb, sk);
 		skb_queue_tail(&sk->sk_receive_queue, skb);
 		sk->sk_data_ready(sk);
 		err = 0;
 	}
 	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;
 	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, GFP_ATOMIC, 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, GFP_ATOMIC, sk);

 		/* Error is cleared after successful 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, allocation, one_sk);

 	kfree_skb(skb);
 	return err;
 }

 static int pfkey_do_dump(struct pfkey_sock *pfk)
 {
 	struct sadb_msg *hdr;
 	int rc;

 	mutex_lock(&pfk->dump_lock);
 	if (!pfk->dump.dump) {
 		rc = 0;
 		goto out;
 	}

 	rc = pfk->dump.dump(pfk);
 	if (rc == -ENOBUFS) {
 		rc = 0;
 		goto out;
 	}

 	if (pfk->dump.skb) {
 		if (!pfkey_can_dump(&pfk->sk)) {
 			rc = 0;
 			goto out;
 		}

 		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);

 out:
 	mutex_unlock(&pfk->dump_lock);
 	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 = 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 const 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),
 	[SADB_X_EXT_FILTER]		= (u8) sizeof(struct sadb_x_filter),
 };

 /* 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;

 	if (sp->sadb_address_len <
 	    DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 			 sizeof(uint64_t)))
 		return -EINVAL;

 	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;
 	}

 	return 0;
 }

 static inline int sadb_key_len(const struct sadb_key *key)
 {
 	int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);

 	return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 			    sizeof(uint64_t));
 }

 static int verify_key_len(const void *p)
 {
 	const struct sadb_key *key = p;

 	if (sadb_key_len(key) > key->sadb_key_len)
 		return -EINVAL;

 	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,
 								     gfp_t gfp)
 {
 	struct xfrm_user_sec_ctx *uctx = NULL;
 	int ctx_size = sec_ctx->sadb_x_ctx_len;

 	uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);

 	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;

 		if (len < sizeof(*ehdr))
 			return -EINVAL;

 		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;
 			switch (ext_type) {
 			case SADB_EXT_ADDRESS_SRC:
 			case SADB_EXT_ADDRESS_DST:
 			case SADB_EXT_ADDRESS_PROXY:
 			case SADB_X_EXT_NAT_T_OA:
 				if (verify_address_len(p))
 					return -EINVAL;
 				break;
 			case SADB_X_EXT_SEC_CTX:
 				if (verify_sec_ctx_len(p))
 					return -EINVAL;
 				break;
 			case SADB_EXT_KEY_AUTH:
 			case SADB_EXT_KEY_ENCRYPT:
 				if (verify_key_len(p))
 					return -EINVAL;
 				break;
 			default:
 				break;
 			}
 			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;
 	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;
 	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 = xaddr->in6;
 		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 = 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 = 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 = 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 = 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 = 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 = 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);
 	BUG_ON(!addr->sadb_address_prefixlen);

 	/* dst address */
 	addr = 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);
 	BUG_ON(!addr->sadb_address_prefixlen);

 	if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 			     x->props.family)) {
 		addr = 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 = 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 = 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 = 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 = 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 = 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 = 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 = 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 == 0)
 		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 == 0)
 		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 = min_t(unsigned int, sa->sadb_sa_replay,
 					(sizeof(x->replay.bitmap) * 8));
 	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, GFP_KERNEL);

 		if (!uctx)
 			goto out;

 		err = security_xfrm_state_alloc(x, uctx);
 		kfree(uctx);

 		if (err)
 			goto out;
 	}

 	err = -ENOBUFS;
 	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) {
 			err = -ENOMEM;
 			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) {
 				err = -ENOMEM;
 				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) {
 				err = -ENOMEM;
 				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->geniv = a->uinfo.encr.geniv;
 		}
 	}
 	/* 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);
 	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) {
 			err = -ENOMEM;
 			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, 0, 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 = verify_spi_info(x->id.proto, min_spi, max_spi);
 	if (err) {
 		xfrm_state_put(x);
 		return err;
 	}

 	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;

 	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, true);

 	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, true);
 	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 = 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 = 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 = 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 | __GFP_ZERO);
 	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 = skb_put_data(skb, 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 = 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;
 	int err, err2;

 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 	if (proto == 0)
 		return -EINVAL;

 	err = xfrm_state_flush(net, proto, true, false);
 	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)
 {
 	struct net *net = sock_net(&pfk->sk);

 	xfrm_state_walk_done(&pfk->dump.u.state, net);
 }

 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
 {
 	u8 proto;
 	struct xfrm_address_filter *filter = NULL;
 	struct pfkey_sock *pfk = pfkey_sk(sk);

 	mutex_lock(&pfk->dump_lock);
 	if (pfk->dump.dump != NULL) {
 		mutex_unlock(&pfk->dump_lock);
 		return -EBUSY;
 	}

 	proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 	if (proto == 0) {
 		mutex_unlock(&pfk->dump_lock);
 		return -EINVAL;
 	}

 	if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
 		struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];

 		if ((xfilter->sadb_x_filter_splen >=
 			(sizeof(xfrm_address_t) << 3)) ||
 		    (xfilter->sadb_x_filter_dplen >=
 			(sizeof(xfrm_address_t) << 3))) {
 			mutex_unlock(&pfk->dump_lock);
 			return -EINVAL;
 		}
 		filter = kmalloc(sizeof(*filter), GFP_KERNEL);
 		if (filter == NULL) {
 			mutex_unlock(&pfk->dump_lock);
 			return -ENOMEM;
 		}

 		memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
 		       sizeof(xfrm_address_t));
 		memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
 		       sizeof(xfrm_address_t));
 		filter->family = xfilter->sadb_x_filter_family;
 		filter->splen = xfilter->sadb_x_filter_splen;
 		filter->dplen = xfilter->sadb_x_filter_dplen;
 	}

 	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, filter);
 	mutex_unlock(&pfk->dump_lock);

 	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, net);
 		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;
 	if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
 		return -EINVAL;

 	t->id.proto = rq->sadb_x_ipsecrequest_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) {
 		int err;

 		err = parse_sockaddr_pair(
 			(struct sockaddr *)(rq + 1),
 			rq->sadb_x_ipsecrequest_len - sizeof(*rq),
 			&t->saddr, &t->id.daddr, &t->encap_family);
 		if (err)
 			return err;
 	} 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(*rq)) {
 		if (len < rq->sadb_x_ipsecrequest_len ||
 		    rq->sadb_x_ipsecrequest_len < sizeof(*rq))
 			return -EINVAL;

 		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 = skb_put(skb, sizeof(struct sadb_msg));
 	memset(hdr, 0, size);	/* XXX do we need this ? */

 	/* src address */
 	addr = 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 = 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 = 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 = 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 = 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 = 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 = 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 = 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 = refcount_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) {
 		kfree_skb(out_skb);
 		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);
 	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, GFP_KERNEL);

 		if (!uctx) {
 			err = -ENOBUFS;
 			goto out;
 		}

 		err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
 		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, true);

 	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, GFP_KERNEL);

 		if (!uctx)
 			return -ENOMEM;

 		err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
 		kfree(uctx);
 		if (err)
 			return err;
 	}

 	xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, 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, true);

 	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);
 	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) {
 		kfree_skb(out_skb);
 		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;
 }

 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 < 2 || 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;
 }

 #ifdef CONFIG_NET_KEY_MIGRATE
 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(*rq1) ||
 	    len < rq1->sadb_x_ipsecrequest_len ||
 	    rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
 		return -EINVAL;

 	/* old endoints */
 	err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
 				  rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
 				  &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(*rq2) ||
 	    len < rq2->sadb_x_ipsecrequest_len ||
 	    rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
 		return -EINVAL;

 	/* new endpoints */
 	err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
 				  rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
 				  &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;
 	struct net *net = sock_net(sk);

 	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, net, NULL, 0);

  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, 0, 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, true);

 		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);
 	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) {
 		kfree_skb(out_skb);
 		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)
 {
 	struct net *net = sock_net((struct sock *)pfk);

 	xfrm_policy_walk_done(&pfk->dump.u.policy, net);
 }

 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);

 	mutex_lock(&pfk->dump_lock);
 	if (pfk->dump.dump != NULL) {
 		mutex_unlock(&pfk->dump_lock);
 		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);
 	mutex_unlock(&pfk->dump_lock);

 	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 = 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;
 	int err, err2;

 	err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
 	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 const 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))
 			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)))
 			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))
 				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 = 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 = skb_put_zero(skb, sizeof(struct sadb_comb));
 			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 = 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 = 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 bool pfkey_is_alive(const struct km_event *c)
 {
 	struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
 	struct sock *sk;
 	bool is_alive = false;

 	rcu_read_lock();
 	sk_for_each_rcu(sk, &net_pfkey->table) {
 		if (pfkey_sk(sk)->registered) {
 			is_alive = true;
 			break;
 		}
 	}
 	rcu_read_unlock();

 	return is_alive;
 }

 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 = 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 = 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 = 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 = 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 = 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*8) {
 			*dir = -EINVAL;
 			goto out;
 		}
 		if ((*dir = verify_sec_ctx_len(p)))
 			goto out;
 		uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
 		*dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
 		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 = 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 = 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 = 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 = 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 = 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 = 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 = 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 = skb_put_zero(skb, 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 = skb_put_zero(skb, 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,
 			      const struct xfrm_encap_tmpl *encap)
 {
 	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 = 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 = 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,
 			      const struct xfrm_encap_tmpl *encap)
 {
 	return -ENOPROTOOPT;
 }
 #endif

 static int pfkey_sendmsg(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;
 	struct net *net = sock_net(sk);

 	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_from_msg(skb_put(skb,len), msg, len))
 		goto out;

 	hdr = pfkey_get_base_msg(skb, &err);
 	if (!hdr)
 		goto out;

 	mutex_lock(&net->xfrm.xfrm_cfg_mutex);
 	err = pfkey_process(sk, skb, hdr);
 	mutex_unlock(&net->xfrm.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 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_msg(skb, 0, msg, 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,
 	.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,
 			       refcount_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 __net_init pfkey_init_proc(struct net *net)
 {
 	struct proc_dir_entry *e;

 	e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
 			sizeof(struct seq_net_private));
 	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 =
 {
 	.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,
 	.is_alive	= pfkey_is_alive,
 };

 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);
 	WARN_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);